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Commit | Line | Data |
---|---|---|
2121bcd9 | 1 | SPDX-License-Identifier: GPL-2.0 |
43982f53 | 2 | aufs5.4 kbuild patch |
7f207e10 | 3 | |
fbc438ed | 4 | diff --git a/fs/Kconfig b/fs/Kconfig |
43982f53 | 5 | index 2501e6f1f965..38a6a5991da9 100644 |
fbc438ed JR |
6 | --- a/fs/Kconfig |
7 | +++ b/fs/Kconfig | |
43982f53 | 8 | @@ -264,6 +264,7 @@ source "fs/pstore/Kconfig" |
5527c038 | 9 | source "fs/sysv/Kconfig" |
7e9cd9fe | 10 | source "fs/ufs/Kconfig" |
9d41a5bf | 11 | source "fs/erofs/Kconfig" |
7f207e10 AM |
12 | +source "fs/aufs/Kconfig" |
13 | ||
14 | endif # MISC_FILESYSTEMS | |
15 | ||
16 | diff --git a/fs/Makefile b/fs/Makefile | |
43982f53 | 17 | index 14231b4cf383..8765e191ebe0 100644 |
7f207e10 AM |
18 | --- a/fs/Makefile |
19 | +++ b/fs/Makefile | |
9d41a5bf | 20 | @@ -132,3 +132,4 @@ obj-$(CONFIG_CEPH_FS) += ceph/ |
bf0370f2 | 21 | obj-$(CONFIG_PSTORE) += pstore/ |
c06a8ce3 | 22 | obj-$(CONFIG_EFIVAR_FS) += efivarfs/ |
9d41a5bf | 23 | obj-$(CONFIG_EROFS_FS) += erofs/ |
86dc4139 | 24 | +obj-$(CONFIG_AUFS_FS) += aufs/ |
2121bcd9 | 25 | SPDX-License-Identifier: GPL-2.0 |
43982f53 | 26 | aufs5.4 base patch |
7f207e10 | 27 | |
c1595e42 | 28 | diff --git a/MAINTAINERS b/MAINTAINERS |
43982f53 | 29 | index 9d3a5c54a41d..f33398b47c42 100644 |
c1595e42 JR |
30 | --- a/MAINTAINERS |
31 | +++ b/MAINTAINERS | |
43982f53 | 32 | @@ -2832,6 +2832,19 @@ F: include/linux/audit.h |
c1595e42 JR |
33 | F: include/uapi/linux/audit.h |
34 | F: kernel/audit* | |
35 | ||
36 | +AUFS (advanced multi layered unification filesystem) FILESYSTEM | |
37 | +M: "J. R. Okajima" <hooanon05g@gmail.com> | |
c1595e42 | 38 | +L: aufs-users@lists.sourceforge.net (members only) |
eca801bf | 39 | +L: linux-unionfs@vger.kernel.org |
c1595e42 | 40 | +W: http://aufs.sourceforge.net |
5527c038 | 41 | +T: git://github.com/sfjro/aufs4-linux.git |
c1595e42 JR |
42 | +S: Supported |
43 | +F: Documentation/filesystems/aufs/ | |
44 | +F: Documentation/ABI/testing/debugfs-aufs | |
45 | +F: Documentation/ABI/testing/sysfs-aufs | |
46 | +F: fs/aufs/ | |
47 | +F: include/uapi/linux/aufs_type.h | |
48 | + | |
49 | AUXILIARY DISPLAY DRIVERS | |
50 | M: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com> | |
cd7a4cd9 | 51 | S: Maintained |
392086de | 52 | diff --git a/drivers/block/loop.c b/drivers/block/loop.c |
43982f53 | 53 | index f6f77eaa7217..5e094699215e 100644 |
392086de AM |
54 | --- a/drivers/block/loop.c |
55 | +++ b/drivers/block/loop.c | |
eca34b5c | 56 | @@ -738,6 +738,24 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
cd7a4cd9 | 57 | return error; |
392086de AM |
58 | } |
59 | ||
60 | +/* | |
61 | + * for AUFS | |
62 | + * no get/put for file. | |
63 | + */ | |
64 | +struct file *loop_backing_file(struct super_block *sb) | |
65 | +{ | |
66 | + struct file *ret; | |
67 | + struct loop_device *l; | |
68 | + | |
69 | + ret = NULL; | |
70 | + if (MAJOR(sb->s_dev) == LOOP_MAJOR) { | |
71 | + l = sb->s_bdev->bd_disk->private_data; | |
72 | + ret = l->lo_backing_file; | |
73 | + } | |
74 | + return ret; | |
75 | +} | |
febd17d6 | 76 | +EXPORT_SYMBOL_GPL(loop_backing_file); |
392086de AM |
77 | + |
78 | /* loop sysfs attributes */ | |
79 | ||
80 | static ssize_t loop_attr_show(struct device *dev, char *page, | |
c1595e42 | 81 | diff --git a/fs/dcache.c b/fs/dcache.c |
eca34b5c | 82 | index e88cf0554e65..7ce4ccf5a51c 100644 |
c1595e42 JR |
83 | --- a/fs/dcache.c |
84 | +++ b/fs/dcache.c | |
eca34b5c | 85 | @@ -1264,7 +1264,7 @@ enum d_walk_ret { |
c1595e42 | 86 | * |
cd7a4cd9 | 87 | * The @enter() callbacks are called with d_lock held. |
c1595e42 JR |
88 | */ |
89 | -static void d_walk(struct dentry *parent, void *data, | |
90 | +void d_walk(struct dentry *parent, void *data, | |
cd7a4cd9 | 91 | enum d_walk_ret (*enter)(void *, struct dentry *)) |
c1595e42 | 92 | { |
cd7a4cd9 | 93 | struct dentry *this_parent; |
febd17d6 | 94 | diff --git a/fs/fcntl.c b/fs/fcntl.c |
43982f53 | 95 | index 3d40771e8e7c..12dd73930961 100644 |
febd17d6 JR |
96 | --- a/fs/fcntl.c |
97 | +++ b/fs/fcntl.c | |
2121bcd9 | 98 | @@ -32,7 +32,7 @@ |
febd17d6 JR |
99 | |
100 | #define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME) | |
101 | ||
102 | -static int setfl(int fd, struct file * filp, unsigned long arg) | |
43982f53 | 103 | +int setfl(int fd, struct file *filp, unsigned long arg) |
febd17d6 JR |
104 | { |
105 | struct inode * inode = file_inode(filp); | |
106 | int error = 0; | |
2121bcd9 | 107 | @@ -63,6 +63,8 @@ static int setfl(int fd, struct file * filp, unsigned long arg) |
febd17d6 JR |
108 | |
109 | if (filp->f_op->check_flags) | |
110 | error = filp->f_op->check_flags(arg); | |
111 | + if (!error && filp->f_op->setfl) | |
112 | + error = filp->f_op->setfl(filp, arg); | |
113 | if (error) | |
114 | return error; | |
115 | ||
5afbbe0d | 116 | diff --git a/fs/inode.c b/fs/inode.c |
43982f53 | 117 | index fef457a42882..aaeacde398ee 100644 |
5afbbe0d AM |
118 | --- a/fs/inode.c |
119 | +++ b/fs/inode.c | |
43982f53 | 120 | @@ -1673,7 +1673,7 @@ EXPORT_SYMBOL(generic_update_time); |
5afbbe0d AM |
121 | * This does the actual work of updating an inodes time or version. Must have |
122 | * had called mnt_want_write() before calling this. | |
123 | */ | |
cd7a4cd9 AM |
124 | -static int update_time(struct inode *inode, struct timespec64 *time, int flags) |
125 | +int update_time(struct inode *inode, struct timespec64 *time, int flags) | |
5afbbe0d | 126 | { |
cd7a4cd9 | 127 | int (*update_time)(struct inode *, struct timespec64 *, int); |
5afbbe0d | 128 | |
8b6a4947 | 129 | diff --git a/fs/namespace.c b/fs/namespace.c |
43982f53 | 130 | index 2adfe7b166a3..0f7e57e5f4b7 100644 |
8b6a4947 AM |
131 | --- a/fs/namespace.c |
132 | +++ b/fs/namespace.c | |
eca34b5c | 133 | @@ -776,6 +776,12 @@ static inline int check_mnt(struct mount *mnt) |
8b6a4947 AM |
134 | return mnt->mnt_ns == current->nsproxy->mnt_ns; |
135 | } | |
136 | ||
137 | +/* for aufs, CONFIG_AUFS_BR_FUSE */ | |
138 | +int is_current_mnt_ns(struct vfsmount *mnt) | |
139 | +{ | |
140 | + return check_mnt(real_mount(mnt)); | |
141 | +} | |
142 | + | |
143 | /* | |
144 | * vfsmount lock must be held for write | |
145 | */ | |
5527c038 | 146 | diff --git a/fs/read_write.c b/fs/read_write.c |
43982f53 | 147 | index 5bbf587f5bc1..fa9b3994b34c 100644 |
5527c038 JR |
148 | --- a/fs/read_write.c |
149 | +++ b/fs/read_write.c | |
fbc438ed | 150 | @@ -498,6 +498,28 @@ static ssize_t __vfs_write(struct file *file, const char __user *p, |
8b6a4947 | 151 | return -EINVAL; |
5527c038 | 152 | } |
5527c038 JR |
153 | |
154 | +vfs_readf_t vfs_readf(struct file *file) | |
155 | +{ | |
156 | + const struct file_operations *fop = file->f_op; | |
157 | + | |
158 | + if (fop->read) | |
159 | + return fop->read; | |
160 | + if (fop->read_iter) | |
161 | + return new_sync_read; | |
43982f53 | 162 | + return ERR_PTR(-ENOSYS); /* doesn't have ->read(|_iter)() op */ |
5527c038 JR |
163 | +} |
164 | + | |
165 | +vfs_writef_t vfs_writef(struct file *file) | |
166 | +{ | |
167 | + const struct file_operations *fop = file->f_op; | |
168 | + | |
169 | + if (fop->write) | |
170 | + return fop->write; | |
171 | + if (fop->write_iter) | |
172 | + return new_sync_write; | |
43982f53 | 173 | + return ERR_PTR(-ENOSYS); /* doesn't have ->write(|_iter)() op */ |
5527c038 JR |
174 | +} |
175 | + | |
8b6a4947 | 176 | ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) |
5527c038 JR |
177 | { |
178 | mm_segment_t old_fs; | |
7f207e10 | 179 | diff --git a/fs/splice.c b/fs/splice.c |
eca34b5c | 180 | index 98412721f056..75b489fcb66f 100644 |
7f207e10 AM |
181 | --- a/fs/splice.c |
182 | +++ b/fs/splice.c | |
fbc438ed | 183 | @@ -834,8 +834,8 @@ EXPORT_SYMBOL(generic_splice_sendpage); |
7f207e10 AM |
184 | /* |
185 | * Attempt to initiate a splice from pipe to file. | |
186 | */ | |
187 | -static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
188 | - loff_t *ppos, size_t len, unsigned int flags) | |
189 | +long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
190 | + loff_t *ppos, size_t len, unsigned int flags) | |
191 | { | |
192 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, | |
193 | loff_t *, size_t, unsigned int); | |
fbc438ed | 194 | @@ -851,9 +851,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
7f207e10 AM |
195 | /* |
196 | * Attempt to initiate a splice from a file to a pipe. | |
197 | */ | |
198 | -static long do_splice_to(struct file *in, loff_t *ppos, | |
199 | - struct pipe_inode_info *pipe, size_t len, | |
200 | - unsigned int flags) | |
201 | +long do_splice_to(struct file *in, loff_t *ppos, | |
202 | + struct pipe_inode_info *pipe, size_t len, | |
203 | + unsigned int flags) | |
204 | { | |
205 | ssize_t (*splice_read)(struct file *, loff_t *, | |
206 | struct pipe_inode_info *, size_t, unsigned int); | |
a2654f78 | 207 | diff --git a/fs/sync.c b/fs/sync.c |
fbc438ed | 208 | index 4d1ff010bc5a..457f4e4a5cc1 100644 |
a2654f78 AM |
209 | --- a/fs/sync.c |
210 | +++ b/fs/sync.c | |
2121bcd9 | 211 | @@ -28,7 +28,7 @@ |
a2654f78 AM |
212 | * wait == 1 case since in that case write_inode() functions do |
213 | * sync_dirty_buffer() and thus effectively write one block at a time. | |
214 | */ | |
215 | -static int __sync_filesystem(struct super_block *sb, int wait) | |
216 | +int __sync_filesystem(struct super_block *sb, int wait) | |
217 | { | |
218 | if (wait) | |
219 | sync_inodes_sb(sb); | |
5527c038 | 220 | diff --git a/include/linux/fs.h b/include/linux/fs.h |
43982f53 | 221 | index e0d909d35763..381a13995011 100644 |
5527c038 JR |
222 | --- a/include/linux/fs.h |
223 | +++ b/include/linux/fs.h | |
43982f53 | 224 | @@ -1349,6 +1349,7 @@ extern void fasync_free(struct fasync_struct *); |
febd17d6 JR |
225 | /* can be called from interrupts */ |
226 | extern void kill_fasync(struct fasync_struct **, int, int); | |
227 | ||
43982f53 | 228 | +extern int setfl(int fd, struct file *filp, unsigned long arg); |
febd17d6 | 229 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); |
3c1bdaff | 230 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
febd17d6 | 231 | extern void f_delown(struct file *filp); |
43982f53 | 232 | @@ -1835,6 +1836,7 @@ struct file_operations { |
febd17d6 JR |
233 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
234 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
235 | int (*check_flags)(int); | |
236 | + int (*setfl)(struct file *, unsigned long); | |
237 | int (*flock) (struct file *, int, struct file_lock *); | |
238 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); | |
239 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
43982f53 | 240 | @@ -1905,6 +1907,12 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
5527c038 JR |
241 | struct iovec *fast_pointer, |
242 | struct iovec **ret_pointer); | |
243 | ||
244 | +typedef ssize_t (*vfs_readf_t)(struct file *, char __user *, size_t, loff_t *); | |
245 | +typedef ssize_t (*vfs_writef_t)(struct file *, const char __user *, size_t, | |
246 | + loff_t *); | |
247 | +vfs_readf_t vfs_readf(struct file *file); | |
248 | +vfs_writef_t vfs_writef(struct file *file); | |
249 | + | |
250 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); | |
5527c038 | 251 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
8b6a4947 | 252 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
43982f53 | 253 | @@ -2325,6 +2333,7 @@ extern int current_umask(void); |
5afbbe0d AM |
254 | extern void ihold(struct inode * inode); |
255 | extern void iput(struct inode *); | |
cd7a4cd9 AM |
256 | extern int generic_update_time(struct inode *, struct timespec64 *, int); |
257 | +extern int update_time(struct inode *, struct timespec64 *, int); | |
5afbbe0d AM |
258 | |
259 | /* /sys/fs */ | |
260 | extern struct kobject *fs_kobj; | |
43982f53 | 261 | @@ -2613,6 +2622,7 @@ static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a2654f78 AM |
262 | return false; |
263 | } | |
264 | #endif | |
265 | +extern int __sync_filesystem(struct super_block *, int); | |
266 | extern int sync_filesystem(struct super_block *); | |
267 | extern const struct file_operations def_blk_fops; | |
268 | extern const struct file_operations def_chr_fops; | |
8b6a4947 | 269 | diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h |
43982f53 | 270 | index b8a835fd611b..f452521f2e05 100644 |
8b6a4947 AM |
271 | --- a/include/linux/lockdep.h |
272 | +++ b/include/linux/lockdep.h | |
43982f53 | 273 | @@ -331,6 +331,8 @@ static inline int lockdep_match_key(struct lockdep_map *lock, |
8b6a4947 AM |
274 | return lock->key == key; |
275 | } | |
276 | ||
277 | +struct lock_class *lockdep_hlock_class(struct held_lock *hlock); | |
278 | + | |
279 | /* | |
280 | * Acquire a lock. | |
281 | * | |
43982f53 | 282 | @@ -473,6 +475,7 @@ struct lockdep_map { }; |
8b6a4947 AM |
283 | |
284 | #define lockdep_depth(tsk) (0) | |
285 | ||
286 | +#define lockdep_is_held(lock) (1) | |
287 | #define lockdep_is_held_type(l, r) (1) | |
288 | ||
289 | #define lockdep_assert_held(l) do { (void)(l); } while (0) | |
290 | diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h | |
ba1aed25 | 291 | index 35942084cd40..24f5fd1a789d 100644 |
8b6a4947 AM |
292 | --- a/include/linux/mnt_namespace.h |
293 | +++ b/include/linux/mnt_namespace.h | |
2121bcd9 | 294 | @@ -6,11 +6,14 @@ |
8b6a4947 AM |
295 | struct mnt_namespace; |
296 | struct fs_struct; | |
297 | struct user_namespace; | |
298 | +struct vfsmount; | |
299 | ||
300 | extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *, | |
301 | struct user_namespace *, struct fs_struct *); | |
302 | extern void put_mnt_ns(struct mnt_namespace *ns); | |
303 | ||
304 | +extern int is_current_mnt_ns(struct vfsmount *mnt); | |
305 | + | |
306 | extern const struct file_operations proc_mounts_operations; | |
307 | extern const struct file_operations proc_mountinfo_operations; | |
308 | extern const struct file_operations proc_mountstats_operations; | |
1e00d052 | 309 | diff --git a/include/linux/splice.h b/include/linux/splice.h |
ba1aed25 | 310 | index 74b4911ac16d..19789fbea567 100644 |
1e00d052 AM |
311 | --- a/include/linux/splice.h |
312 | +++ b/include/linux/splice.h | |
2121bcd9 | 313 | @@ -87,4 +87,10 @@ extern void splice_shrink_spd(struct splice_pipe_desc *); |
4b3da204 AM |
314 | |
315 | extern const struct pipe_buf_operations page_cache_pipe_buf_ops; | |
106341ce | 316 | extern const struct pipe_buf_operations default_pipe_buf_ops; |
1e00d052 AM |
317 | + |
318 | +extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
319 | + loff_t *ppos, size_t len, unsigned int flags); | |
320 | +extern long do_splice_to(struct file *in, loff_t *ppos, | |
321 | + struct pipe_inode_info *pipe, size_t len, | |
322 | + unsigned int flags); | |
323 | #endif | |
8b6a4947 | 324 | diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c |
43982f53 | 325 | index 233459c03b5a..407c08ac8ac8 100644 |
8b6a4947 AM |
326 | --- a/kernel/locking/lockdep.c |
327 | +++ b/kernel/locking/lockdep.c | |
eca34b5c | 328 | @@ -153,7 +153,7 @@ static |
9f237c51 | 329 | struct lock_class lock_classes[MAX_LOCKDEP_KEYS]; |
eca34b5c | 330 | static DECLARE_BITMAP(lock_classes_in_use, MAX_LOCKDEP_KEYS); |
8b6a4947 AM |
331 | |
332 | -static inline struct lock_class *hlock_class(struct held_lock *hlock) | |
333 | +inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) | |
334 | { | |
eca34b5c AM |
335 | unsigned int class_idx = hlock->class_idx; |
336 | ||
337 | @@ -174,6 +174,7 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock) | |
338 | */ | |
339 | return lock_classes + class_idx; | |
8b6a4947 AM |
340 | } |
341 | +#define hlock_class(hlock) lockdep_hlock_class(hlock) | |
342 | ||
343 | #ifdef CONFIG_LOCK_STAT | |
344 | static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], cpu_lock_stats); | |
2121bcd9 | 345 | SPDX-License-Identifier: GPL-2.0 |
43982f53 | 346 | aufs5.4 mmap patch |
fb47a38f | 347 | |
c1595e42 | 348 | diff --git a/fs/proc/base.c b/fs/proc/base.c |
eca34b5c | 349 | index ebea9501afb8..dc7edc5f7267 100644 |
c1595e42 JR |
350 | --- a/fs/proc/base.c |
351 | +++ b/fs/proc/base.c | |
eca34b5c AM |
352 | @@ -2037,7 +2037,7 @@ static int map_files_get_link(struct dentry *dentry, struct path *path) |
353 | rc = -ENOENT; | |
c1595e42 JR |
354 | vma = find_exact_vma(mm, vm_start, vm_end); |
355 | if (vma && vma->vm_file) { | |
356 | - *path = vma->vm_file->f_path; | |
357 | + *path = vma_pr_or_file(vma)->f_path; | |
358 | path_get(path); | |
359 | rc = 0; | |
360 | } | |
fb47a38f | 361 | diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c |
fbc438ed | 362 | index 14c2badb8fd9..65afe5287e43 100644 |
fb47a38f JR |
363 | --- a/fs/proc/nommu.c |
364 | +++ b/fs/proc/nommu.c | |
fbc438ed | 365 | @@ -41,7 +41,10 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region) |
fb47a38f JR |
366 | file = region->vm_file; |
367 | ||
368 | if (file) { | |
369 | - struct inode *inode = file_inode(region->vm_file); | |
370 | + struct inode *inode; | |
076b876e | 371 | + |
fb47a38f JR |
372 | + file = vmr_pr_or_file(region); |
373 | + inode = file_inode(file); | |
374 | dev = inode->i_sb->s_dev; | |
375 | ino = inode->i_ino; | |
376 | } | |
377 | diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c | |
43982f53 | 378 | index 9442631fd4af..1fa8a5fcdeee 100644 |
fb47a38f JR |
379 | --- a/fs/proc/task_mmu.c |
380 | +++ b/fs/proc/task_mmu.c | |
eca34b5c | 381 | @@ -309,7 +309,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma) |
fb47a38f JR |
382 | const char *name = NULL; |
383 | ||
384 | if (file) { | |
385 | - struct inode *inode = file_inode(vma->vm_file); | |
386 | + struct inode *inode; | |
076b876e | 387 | + |
fb47a38f JR |
388 | + file = vma_pr_or_file(vma); |
389 | + inode = file_inode(file); | |
390 | dev = inode->i_sb->s_dev; | |
391 | ino = inode->i_ino; | |
392 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; | |
43982f53 | 393 | @@ -1819,7 +1822,7 @@ static int show_numa_map(struct seq_file *m, void *v) |
076b876e AM |
394 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; |
395 | struct vm_area_struct *vma = v; | |
396 | struct numa_maps *md = &numa_priv->md; | |
397 | - struct file *file = vma->vm_file; | |
398 | + struct file *file = vma_pr_or_file(vma); | |
076b876e | 399 | struct mm_struct *mm = vma->vm_mm; |
43982f53 AM |
400 | struct mempolicy *pol; |
401 | char buffer[64]; | |
fb47a38f | 402 | diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c |
eca34b5c | 403 | index 7907e6419e57..d17209cf52bc 100644 |
fb47a38f JR |
404 | --- a/fs/proc/task_nommu.c |
405 | +++ b/fs/proc/task_nommu.c | |
acd2b654 | 406 | @@ -155,7 +155,10 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma) |
fb47a38f JR |
407 | file = vma->vm_file; |
408 | ||
409 | if (file) { | |
410 | - struct inode *inode = file_inode(vma->vm_file); | |
411 | + struct inode *inode; | |
076b876e | 412 | + |
b912730e | 413 | + file = vma_pr_or_file(vma); |
fb47a38f JR |
414 | + inode = file_inode(file); |
415 | dev = inode->i_sb->s_dev; | |
416 | ino = inode->i_ino; | |
417 | pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; | |
418 | diff --git a/include/linux/mm.h b/include/linux/mm.h | |
43982f53 | 419 | index a2adf95b3f9c..70e1dccc1283 100644 |
fb47a38f JR |
420 | --- a/include/linux/mm.h |
421 | +++ b/include/linux/mm.h | |
43982f53 | 422 | @@ -1510,6 +1510,28 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, |
a3232e84 | 423 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
fb47a38f | 424 | } |
fb47a38f | 425 | |
076b876e AM |
426 | +extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int); |
427 | +extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[], | |
f2c43d5f | 428 | + int); |
076b876e AM |
429 | +extern void vma_do_get_file(struct vm_area_struct *, const char[], int); |
430 | +extern void vma_do_fput(struct vm_area_struct *, const char[], int); | |
fb47a38f | 431 | + |
f2c43d5f AM |
432 | +#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \ |
433 | + __LINE__) | |
434 | +#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \ | |
435 | + __LINE__) | |
436 | +#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__) | |
437 | +#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__) | |
b912730e AM |
438 | + |
439 | +#ifndef CONFIG_MMU | |
076b876e AM |
440 | +extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int); |
441 | +extern void vmr_do_fput(struct vm_region *, const char[], int); | |
442 | + | |
f2c43d5f AM |
443 | +#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \ |
444 | + __LINE__) | |
445 | +#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__) | |
b912730e | 446 | +#endif /* !CONFIG_MMU */ |
fb47a38f | 447 | + |
a3232e84 JR |
448 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, |
449 | void *buf, int len, unsigned int gup_flags); | |
fb47a38f | 450 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
fb47a38f | 451 | diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h |
43982f53 | 452 | index 270aa8fd2800..33848c2165e2 100644 |
fb47a38f JR |
453 | --- a/include/linux/mm_types.h |
454 | +++ b/include/linux/mm_types.h | |
43982f53 | 455 | @@ -267,6 +267,7 @@ struct vm_region { |
fb47a38f JR |
456 | unsigned long vm_top; /* region allocated to here */ |
457 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ | |
458 | struct file *vm_file; /* the backing file or NULL */ | |
459 | + struct file *vm_prfile; /* the virtual backing file or NULL */ | |
460 | ||
461 | int vm_usage; /* region usage count (access under nommu_region_sem) */ | |
462 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for | |
43982f53 | 463 | @@ -341,6 +342,7 @@ struct vm_area_struct { |
fb47a38f | 464 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE |
5afbbe0d | 465 | units */ |
fb47a38f JR |
466 | struct file * vm_file; /* File we map to (can be NULL). */ |
467 | + struct file *vm_prfile; /* shadow of vm_file */ | |
468 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
469 | ||
eca34b5c | 470 | #ifdef CONFIG_SWAP |
fb47a38f | 471 | diff --git a/kernel/fork.c b/kernel/fork.c |
43982f53 | 472 | index 13b38794efb5..ede7225bae95 100644 |
fb47a38f JR |
473 | --- a/kernel/fork.c |
474 | +++ b/kernel/fork.c | |
43982f53 | 475 | @@ -562,7 +562,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, |
fb47a38f JR |
476 | struct inode *inode = file_inode(file); |
477 | struct address_space *mapping = file->f_mapping; | |
478 | ||
479 | - get_file(file); | |
480 | + vma_get_file(tmp); | |
481 | if (tmp->vm_flags & VM_DENYWRITE) | |
482 | atomic_dec(&inode->i_writecount); | |
2000de60 | 483 | i_mmap_lock_write(mapping); |
076b876e | 484 | diff --git a/mm/Makefile b/mm/Makefile |
43982f53 | 485 | index d996846697ef..fbadb91df4e4 100644 |
076b876e AM |
486 | --- a/mm/Makefile |
487 | +++ b/mm/Makefile | |
43982f53 | 488 | @@ -42,7 +42,7 @@ obj-y := filemap.o mempool.o oom_kill.o fadvise.o \ |
076b876e | 489 | mm_init.o mmu_context.o percpu.o slab_common.o \ |
b00004a5 | 490 | compaction.o vmacache.o \ |
076b876e | 491 | interval_tree.o list_lru.o workingset.o \ |
eca34b5c AM |
492 | - debug.o gup.o $(mmu-y) |
493 | + prfile.o debug.o gup.o $(mmu-y) | |
076b876e | 494 | |
fbc438ed JR |
495 | # Give 'page_alloc' its own module-parameter namespace |
496 | page-alloc-y := page_alloc.o | |
fb47a38f | 497 | diff --git a/mm/filemap.c b/mm/filemap.c |
43982f53 | 498 | index 85b7d087eb45..115275a4a0e2 100644 |
fb47a38f JR |
499 | --- a/mm/filemap.c |
500 | +++ b/mm/filemap.c | |
43982f53 | 501 | @@ -2696,7 +2696,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) |
cd7a4cd9 | 502 | vm_fault_t ret = VM_FAULT_LOCKED; |
fb47a38f JR |
503 | |
504 | sb_start_pagefault(inode->i_sb); | |
521ced18 JR |
505 | - file_update_time(vmf->vma->vm_file); |
506 | + vma_file_update_time(vmf->vma); | |
fb47a38f JR |
507 | lock_page(page); |
508 | if (page->mapping != inode->i_mapping) { | |
509 | unlock_page(page); | |
fb47a38f | 510 | diff --git a/mm/mmap.c b/mm/mmap.c |
43982f53 | 511 | index a7d8c84d19b7..9c350dc3f570 100644 |
fb47a38f JR |
512 | --- a/mm/mmap.c |
513 | +++ b/mm/mmap.c | |
fbc438ed | 514 | @@ -182,7 +182,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma) |
fb47a38f JR |
515 | if (vma->vm_ops && vma->vm_ops->close) |
516 | vma->vm_ops->close(vma); | |
517 | if (vma->vm_file) | |
518 | - fput(vma->vm_file); | |
519 | + vma_fput(vma); | |
520 | mpol_put(vma_policy(vma)); | |
cd7a4cd9 | 521 | vm_area_free(vma); |
fb47a38f | 522 | return next; |
43982f53 | 523 | @@ -940,7 +940,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
fb47a38f JR |
524 | if (remove_next) { |
525 | if (file) { | |
526 | uprobe_munmap(next, next->vm_start, next->vm_end); | |
527 | - fput(file); | |
528 | + vma_fput(vma); | |
529 | } | |
530 | if (next->anon_vma) | |
531 | anon_vma_merge(vma, next); | |
43982f53 | 532 | @@ -1865,8 +1865,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr, |
35939ee7 JR |
533 | return addr; |
534 | ||
fb47a38f | 535 | unmap_and_free_vma: |
fb47a38f JR |
536 | + vma_fput(vma); |
537 | vma->vm_file = NULL; | |
538 | - fput(file); | |
539 | ||
540 | /* Undo any partial mapping done by a device driver. */ | |
541 | unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); | |
43982f53 | 542 | @@ -2695,7 +2695,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, |
fb47a38f JR |
543 | goto out_free_mpol; |
544 | ||
545 | if (new->vm_file) | |
546 | - get_file(new->vm_file); | |
547 | + vma_get_file(new); | |
548 | ||
549 | if (new->vm_ops && new->vm_ops->open) | |
550 | new->vm_ops->open(new); | |
43982f53 | 551 | @@ -2714,7 +2714,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, |
fb47a38f JR |
552 | if (new->vm_ops && new->vm_ops->close) |
553 | new->vm_ops->close(new); | |
554 | if (new->vm_file) | |
555 | - fput(new->vm_file); | |
556 | + vma_fput(new); | |
557 | unlink_anon_vmas(new); | |
558 | out_free_mpol: | |
559 | mpol_put(vma_policy(new)); | |
43982f53 | 560 | @@ -2906,7 +2906,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, |
7e9cd9fe AM |
561 | struct vm_area_struct *vma; |
562 | unsigned long populate = 0; | |
563 | unsigned long ret = -EINVAL; | |
564 | - struct file *file; | |
5afbbe0d | 565 | + struct file *file, *prfile; |
7e9cd9fe | 566 | |
cd7a4cd9 | 567 | pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n", |
5afbbe0d | 568 | current->comm, current->pid); |
43982f53 | 569 | @@ -2981,10 +2981,27 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, |
febd17d6 | 570 | } |
7e9cd9fe AM |
571 | } |
572 | ||
573 | - file = get_file(vma->vm_file); | |
574 | + vma_get_file(vma); | |
5afbbe0d AM |
575 | + file = vma->vm_file; |
576 | + prfile = vma->vm_prfile; | |
7e9cd9fe | 577 | ret = do_mmap_pgoff(vma->vm_file, start, size, |
521ced18 | 578 | prot, flags, pgoff, &populate, NULL); |
5afbbe0d AM |
579 | + if (!IS_ERR_VALUE(ret) && file && prfile) { |
580 | + struct vm_area_struct *new_vma; | |
581 | + | |
582 | + new_vma = find_vma(mm, ret); | |
583 | + if (!new_vma->vm_prfile) | |
584 | + new_vma->vm_prfile = prfile; | |
585 | + if (new_vma != vma) | |
586 | + get_file(prfile); | |
587 | + } | |
588 | + /* | |
589 | + * two fput()s instead of vma_fput(vma), | |
590 | + * coz vma may not be available anymore. | |
591 | + */ | |
592 | fput(file); | |
593 | + if (prfile) | |
594 | + fput(prfile); | |
7e9cd9fe AM |
595 | out: |
596 | up_write(&mm->mmap_sem); | |
597 | if (populate) | |
43982f53 | 598 | @@ -3274,7 +3291,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, |
79b8bda9 AM |
599 | if (anon_vma_clone(new_vma, vma)) |
600 | goto out_free_mempol; | |
601 | if (new_vma->vm_file) | |
602 | - get_file(new_vma->vm_file); | |
603 | + vma_get_file(new_vma); | |
604 | if (new_vma->vm_ops && new_vma->vm_ops->open) | |
605 | new_vma->vm_ops->open(new_vma); | |
606 | vma_link(mm, new_vma, prev, rb_link, rb_parent); | |
fb47a38f | 607 | diff --git a/mm/nommu.c b/mm/nommu.c |
43982f53 | 608 | index 99b7ec318824..de5b6cd162fe 100644 |
fb47a38f JR |
609 | --- a/mm/nommu.c |
610 | +++ b/mm/nommu.c | |
eca34b5c | 611 | @@ -552,7 +552,7 @@ static void __put_nommu_region(struct vm_region *region) |
fb47a38f JR |
612 | up_write(&nommu_region_sem); |
613 | ||
614 | if (region->vm_file) | |
615 | - fput(region->vm_file); | |
616 | + vmr_fput(region); | |
617 | ||
618 | /* IO memory and memory shared directly out of the pagecache | |
619 | * from ramfs/tmpfs mustn't be released here */ | |
eca34b5c | 620 | @@ -690,7 +690,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) |
fb47a38f JR |
621 | if (vma->vm_ops && vma->vm_ops->close) |
622 | vma->vm_ops->close(vma); | |
623 | if (vma->vm_file) | |
624 | - fput(vma->vm_file); | |
625 | + vma_fput(vma); | |
626 | put_nommu_region(vma->vm_region); | |
cd7a4cd9 | 627 | vm_area_free(vma); |
fb47a38f | 628 | } |
eca34b5c | 629 | @@ -1213,7 +1213,7 @@ unsigned long do_mmap(struct file *file, |
fb47a38f JR |
630 | goto error_just_free; |
631 | } | |
632 | } | |
633 | - fput(region->vm_file); | |
634 | + vmr_fput(region); | |
635 | kmem_cache_free(vm_region_jar, region); | |
636 | region = pregion; | |
637 | result = start; | |
eca34b5c | 638 | @@ -1290,10 +1290,10 @@ unsigned long do_mmap(struct file *file, |
fb47a38f JR |
639 | up_write(&nommu_region_sem); |
640 | error: | |
641 | if (region->vm_file) | |
642 | - fput(region->vm_file); | |
643 | + vmr_fput(region); | |
644 | kmem_cache_free(vm_region_jar, region); | |
645 | if (vma->vm_file) | |
eca801bf AM |
646 | - fput(vma->vm_file); |
647 | + vma_fput(vma); | |
648 | vm_area_free(vma); | |
649 | return ret; | |
650 | ||
076b876e AM |
651 | diff --git a/mm/prfile.c b/mm/prfile.c |
652 | new file mode 100644 | |
016522bc | 653 | index 000000000000..00d51187c325 |
076b876e AM |
654 | --- /dev/null |
655 | +++ b/mm/prfile.c | |
2121bcd9 | 656 | @@ -0,0 +1,86 @@ |
cd7a4cd9 | 657 | +// SPDX-License-Identifier: GPL-2.0 |
076b876e | 658 | +/* |
1c60b727 AM |
659 | + * Mainly for aufs which mmap(2) different file and wants to print different |
660 | + * path in /proc/PID/maps. | |
076b876e AM |
661 | + * Call these functions via macros defined in linux/mm.h. |
662 | + * | |
663 | + * See Documentation/filesystems/aufs/design/06mmap.txt | |
664 | + * | |
016522bc | 665 | + * Copyright (c) 2014-2020 Junjro R. Okajima |
076b876e AM |
666 | + * Copyright (c) 2014 Ian Campbell |
667 | + */ | |
668 | + | |
669 | +#include <linux/mm.h> | |
670 | +#include <linux/file.h> | |
671 | +#include <linux/fs.h> | |
672 | + | |
673 | +/* #define PRFILE_TRACE */ | |
674 | +static inline void prfile_trace(struct file *f, struct file *pr, | |
675 | + const char func[], int line, const char func2[]) | |
676 | +{ | |
677 | +#ifdef PRFILE_TRACE | |
678 | + if (pr) | |
1c60b727 | 679 | + pr_info("%s:%d: %s, %pD2\n", func, line, func2, f); |
076b876e AM |
680 | +#endif |
681 | +} | |
682 | + | |
076b876e AM |
683 | +void vma_do_file_update_time(struct vm_area_struct *vma, const char func[], |
684 | + int line) | |
685 | +{ | |
686 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
687 | + | |
688 | + prfile_trace(f, pr, func, line, __func__); | |
689 | + file_update_time(f); | |
690 | + if (f && pr) | |
691 | + file_update_time(pr); | |
692 | +} | |
693 | + | |
694 | +struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[], | |
695 | + int line) | |
696 | +{ | |
697 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
698 | + | |
699 | + prfile_trace(f, pr, func, line, __func__); | |
700 | + return (f && pr) ? pr : f; | |
701 | +} | |
702 | + | |
703 | +void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line) | |
704 | +{ | |
705 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
706 | + | |
707 | + prfile_trace(f, pr, func, line, __func__); | |
708 | + get_file(f); | |
709 | + if (f && pr) | |
710 | + get_file(pr); | |
711 | +} | |
712 | + | |
713 | +void vma_do_fput(struct vm_area_struct *vma, const char func[], int line) | |
714 | +{ | |
715 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
716 | + | |
717 | + prfile_trace(f, pr, func, line, __func__); | |
718 | + fput(f); | |
719 | + if (f && pr) | |
720 | + fput(pr); | |
721 | +} | |
b912730e AM |
722 | + |
723 | +#ifndef CONFIG_MMU | |
076b876e AM |
724 | +struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[], |
725 | + int line) | |
726 | +{ | |
727 | + struct file *f = region->vm_file, *pr = region->vm_prfile; | |
728 | + | |
729 | + prfile_trace(f, pr, func, line, __func__); | |
730 | + return (f && pr) ? pr : f; | |
731 | +} | |
732 | + | |
733 | +void vmr_do_fput(struct vm_region *region, const char func[], int line) | |
734 | +{ | |
735 | + struct file *f = region->vm_file, *pr = region->vm_prfile; | |
736 | + | |
737 | + prfile_trace(f, pr, func, line, __func__); | |
738 | + fput(f); | |
739 | + if (f && pr) | |
740 | + fput(pr); | |
741 | +} | |
b912730e | 742 | +#endif /* !CONFIG_MMU */ |
2121bcd9 | 743 | SPDX-License-Identifier: GPL-2.0 |
43982f53 | 744 | aufs5.4 standalone patch |
7f207e10 | 745 | |
c1595e42 | 746 | diff --git a/fs/dcache.c b/fs/dcache.c |
eca34b5c | 747 | index 7ce4ccf5a51c..00d7e6a08026 100644 |
c1595e42 JR |
748 | --- a/fs/dcache.c |
749 | +++ b/fs/dcache.c | |
eca34b5c | 750 | @@ -1369,6 +1369,7 @@ void d_walk(struct dentry *parent, void *data, |
c1595e42 JR |
751 | seq = 1; |
752 | goto again; | |
753 | } | |
febd17d6 | 754 | +EXPORT_SYMBOL_GPL(d_walk); |
c1595e42 | 755 | |
a2654f78 AM |
756 | struct check_mount { |
757 | struct vfsmount *mnt; | |
eca34b5c | 758 | @@ -2914,6 +2915,7 @@ void d_exchange(struct dentry *dentry1, struct dentry *dentry2) |
f2c43d5f AM |
759 | |
760 | write_sequnlock(&rename_lock); | |
761 | } | |
762 | +EXPORT_SYMBOL_GPL(d_exchange); | |
763 | ||
764 | /** | |
765 | * d_ancestor - search for an ancestor | |
79b8bda9 | 766 | diff --git a/fs/exec.c b/fs/exec.c |
43982f53 | 767 | index 555e93c7dec8..dad39c6b3878 100644 |
79b8bda9 AM |
768 | --- a/fs/exec.c |
769 | +++ b/fs/exec.c | |
fbc438ed | 770 | @@ -110,6 +110,7 @@ bool path_noexec(const struct path *path) |
79b8bda9 AM |
771 | return (path->mnt->mnt_flags & MNT_NOEXEC) || |
772 | (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); | |
773 | } | |
febd17d6 | 774 | +EXPORT_SYMBOL_GPL(path_noexec); |
79b8bda9 AM |
775 | |
776 | #ifdef CONFIG_USELIB | |
777 | /* | |
febd17d6 | 778 | diff --git a/fs/fcntl.c b/fs/fcntl.c |
43982f53 | 779 | index 12dd73930961..0468c845190f 100644 |
febd17d6 JR |
780 | --- a/fs/fcntl.c |
781 | +++ b/fs/fcntl.c | |
43982f53 | 782 | @@ -85,6 +85,7 @@ int setfl(int fd, struct file *filp, unsigned long arg) |
febd17d6 JR |
783 | out: |
784 | return error; | |
785 | } | |
786 | +EXPORT_SYMBOL_GPL(setfl); | |
787 | ||
788 | static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, | |
789 | int force) | |
b912730e | 790 | diff --git a/fs/file_table.c b/fs/file_table.c |
43982f53 | 791 | index 30d55c9a1744..34b9bbf4c556 100644 |
b912730e AM |
792 | --- a/fs/file_table.c |
793 | +++ b/fs/file_table.c | |
fbc438ed | 794 | @@ -162,6 +162,7 @@ struct file *alloc_empty_file(int flags, const struct cred *cred) |
b912730e AM |
795 | } |
796 | return ERR_PTR(-ENFILE); | |
797 | } | |
acd2b654 | 798 | +EXPORT_SYMBOL_GPL(alloc_empty_file); |
b912730e | 799 | |
acd2b654 AM |
800 | /* |
801 | * Variant of alloc_empty_file() that doesn't check and modify nr_files. | |
5afbbe0d | 802 | diff --git a/fs/inode.c b/fs/inode.c |
43982f53 | 803 | index aaeacde398ee..5be87f2d3828 100644 |
5afbbe0d AM |
804 | --- a/fs/inode.c |
805 | +++ b/fs/inode.c | |
43982f53 | 806 | @@ -1682,6 +1682,7 @@ int update_time(struct inode *inode, struct timespec64 *time, int flags) |
5afbbe0d AM |
807 | |
808 | return update_time(inode, time, flags); | |
809 | } | |
810 | +EXPORT_SYMBOL_GPL(update_time); | |
811 | ||
812 | /** | |
813 | * touch_atime - update the access time | |
7f207e10 | 814 | diff --git a/fs/namespace.c b/fs/namespace.c |
43982f53 | 815 | index 0f7e57e5f4b7..516c2f397d33 100644 |
7f207e10 AM |
816 | --- a/fs/namespace.c |
817 | +++ b/fs/namespace.c | |
eca34b5c | 818 | @@ -431,6 +431,7 @@ void __mnt_drop_write(struct vfsmount *mnt) |
c06a8ce3 AM |
819 | mnt_dec_writers(real_mount(mnt)); |
820 | preempt_enable(); | |
821 | } | |
822 | +EXPORT_SYMBOL_GPL(__mnt_drop_write); | |
823 | ||
824 | /** | |
825 | * mnt_drop_write - give up write access to a mount | |
eca34b5c | 826 | @@ -781,6 +782,7 @@ int is_current_mnt_ns(struct vfsmount *mnt) |
8b6a4947 AM |
827 | { |
828 | return check_mnt(real_mount(mnt)); | |
829 | } | |
830 | +EXPORT_SYMBOL_GPL(is_current_mnt_ns); | |
831 | ||
832 | /* | |
833 | * vfsmount lock must be held for write | |
43982f53 | 834 | @@ -1903,6 +1905,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, |
7f207e10 AM |
835 | } |
836 | return 0; | |
837 | } | |
febd17d6 | 838 | +EXPORT_SYMBOL_GPL(iterate_mounts); |
7f207e10 | 839 | |
fbc438ed | 840 | static void lock_mnt_tree(struct mount *mnt) |
7f207e10 | 841 | { |
43982f53 AM |
842 | diff --git a/fs/notify/group.c b/fs/notify/group.c |
843 | index 133f723aca07..0b9f7f6d8390 100644 | |
844 | --- a/fs/notify/group.c | |
845 | +++ b/fs/notify/group.c | |
846 | @@ -99,6 +99,7 @@ void fsnotify_get_group(struct fsnotify_group *group) | |
1716fcea | 847 | { |
2121bcd9 | 848 | refcount_inc(&group->refcnt); |
1716fcea | 849 | } |
febd17d6 | 850 | +EXPORT_SYMBOL_GPL(fsnotify_get_group); |
1716fcea AM |
851 | |
852 | /* | |
853 | * Drop a reference to a group. Free it if it's through. | |
7f207e10 | 854 | diff --git a/fs/open.c b/fs/open.c |
43982f53 | 855 | index b62f5c0923a8..89af4b9c7319 100644 |
7f207e10 AM |
856 | --- a/fs/open.c |
857 | +++ b/fs/open.c | |
fbc438ed | 858 | @@ -65,6 +65,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
febd17d6 | 859 | inode_unlock(dentry->d_inode); |
7f207e10 AM |
860 | return ret; |
861 | } | |
febd17d6 | 862 | +EXPORT_SYMBOL_GPL(do_truncate); |
7f207e10 | 863 | |
5afbbe0d | 864 | long vfs_truncate(const struct path *path, loff_t length) |
7f207e10 | 865 | { |
5527c038 | 866 | diff --git a/fs/read_write.c b/fs/read_write.c |
43982f53 | 867 | index fa9b3994b34c..eb0e2c6ebaff 100644 |
5527c038 JR |
868 | --- a/fs/read_write.c |
869 | +++ b/fs/read_write.c | |
fbc438ed | 870 | @@ -468,6 +468,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
8b6a4947 AM |
871 | |
872 | return ret; | |
873 | } | |
874 | +EXPORT_SYMBOL_GPL(vfs_read); | |
875 | ||
876 | static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) | |
877 | { | |
fbc438ed | 878 | @@ -508,6 +509,7 @@ vfs_readf_t vfs_readf(struct file *file) |
5527c038 | 879 | return new_sync_read; |
43982f53 | 880 | return ERR_PTR(-ENOSYS); /* doesn't have ->read(|_iter)() op */ |
5527c038 | 881 | } |
febd17d6 | 882 | +EXPORT_SYMBOL_GPL(vfs_readf); |
5527c038 JR |
883 | |
884 | vfs_writef_t vfs_writef(struct file *file) | |
885 | { | |
fbc438ed | 886 | @@ -519,6 +521,7 @@ vfs_writef_t vfs_writef(struct file *file) |
5527c038 | 887 | return new_sync_write; |
43982f53 | 888 | return ERR_PTR(-ENOSYS); /* doesn't have ->write(|_iter)() op */ |
5527c038 | 889 | } |
febd17d6 | 890 | +EXPORT_SYMBOL_GPL(vfs_writef); |
5527c038 | 891 | |
8b6a4947 AM |
892 | ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) |
893 | { | |
fbc438ed | 894 | @@ -588,6 +591,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ |
8b6a4947 AM |
895 | |
896 | return ret; | |
897 | } | |
898 | +EXPORT_SYMBOL_GPL(vfs_write); | |
899 | ||
fbc438ed JR |
900 | /* file_ppos returns &file->f_pos or NULL if file is stream */ |
901 | static inline loff_t *file_ppos(struct file *file) | |
7f207e10 | 902 | diff --git a/fs/splice.c b/fs/splice.c |
eca34b5c | 903 | index 75b489fcb66f..0a1f7498c22b 100644 |
7f207e10 AM |
904 | --- a/fs/splice.c |
905 | +++ b/fs/splice.c | |
fbc438ed | 906 | @@ -847,6 +847,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
392086de AM |
907 | |
908 | return splice_write(pipe, out, ppos, len, flags); | |
7f207e10 | 909 | } |
febd17d6 | 910 | +EXPORT_SYMBOL_GPL(do_splice_from); |
7f207e10 AM |
911 | |
912 | /* | |
913 | * Attempt to initiate a splice from a file to a pipe. | |
fbc438ed | 914 | @@ -876,6 +877,7 @@ long do_splice_to(struct file *in, loff_t *ppos, |
7f207e10 AM |
915 | |
916 | return splice_read(in, ppos, pipe, len, flags); | |
917 | } | |
febd17d6 | 918 | +EXPORT_SYMBOL_GPL(do_splice_to); |
7f207e10 AM |
919 | |
920 | /** | |
921 | * splice_direct_to_actor - splices data directly between two non-pipes | |
a2654f78 | 922 | diff --git a/fs/sync.c b/fs/sync.c |
fbc438ed | 923 | index 457f4e4a5cc1..67c66358f3fe 100644 |
a2654f78 AM |
924 | --- a/fs/sync.c |
925 | +++ b/fs/sync.c | |
2121bcd9 | 926 | @@ -39,6 +39,7 @@ int __sync_filesystem(struct super_block *sb, int wait) |
a2654f78 AM |
927 | sb->s_op->sync_fs(sb, wait); |
928 | return __sync_blockdev(sb->s_bdev, wait); | |
929 | } | |
930 | +EXPORT_SYMBOL_GPL(__sync_filesystem); | |
931 | ||
932 | /* | |
933 | * Write out and wait upon all dirty data associated with this | |
c1595e42 | 934 | diff --git a/fs/xattr.c b/fs/xattr.c |
fbc438ed | 935 | index 90dd78f0eb27..40b01dd1b14a 100644 |
c1595e42 JR |
936 | --- a/fs/xattr.c |
937 | +++ b/fs/xattr.c | |
fbc438ed | 938 | @@ -296,6 +296,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, |
c1595e42 JR |
939 | *xattr_value = value; |
940 | return error; | |
941 | } | |
febd17d6 | 942 | +EXPORT_SYMBOL_GPL(vfs_getxattr_alloc); |
c1595e42 | 943 | |
febd17d6 | 944 | ssize_t |
f2c43d5f | 945 | __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, |
8b6a4947 | 946 | diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c |
43982f53 | 947 | index 407c08ac8ac8..d7f71842f8a2 100644 |
8b6a4947 AM |
948 | --- a/kernel/locking/lockdep.c |
949 | +++ b/kernel/locking/lockdep.c | |
eca34b5c AM |
950 | @@ -174,6 +174,7 @@ inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) |
951 | */ | |
952 | return lock_classes + class_idx; | |
8b6a4947 AM |
953 | } |
954 | +EXPORT_SYMBOL_GPL(lockdep_hlock_class); | |
955 | #define hlock_class(hlock) lockdep_hlock_class(hlock) | |
956 | ||
957 | #ifdef CONFIG_LOCK_STAT | |
8cdd5066 | 958 | diff --git a/kernel/task_work.c b/kernel/task_work.c |
ba1aed25 | 959 | index 0fef395662a6..83fb1ecfc33d 100644 |
8cdd5066 JR |
960 | --- a/kernel/task_work.c |
961 | +++ b/kernel/task_work.c | |
2121bcd9 | 962 | @@ -116,3 +116,4 @@ void task_work_run(void) |
8cdd5066 JR |
963 | } while (work); |
964 | } | |
965 | } | |
febd17d6 | 966 | +EXPORT_SYMBOL_GPL(task_work_run); |
7f207e10 | 967 | diff --git a/security/device_cgroup.c b/security/device_cgroup.c |
eca34b5c | 968 | index 725674f3276d..83f6494c52a2 100644 |
7f207e10 AM |
969 | --- a/security/device_cgroup.c |
970 | +++ b/security/device_cgroup.c | |
83b672a5 | 971 | @@ -824,3 +824,4 @@ int __devcgroup_check_permission(short type, u32 major, u32 minor, |
7f207e10 | 972 | |
2121bcd9 AM |
973 | return 0; |
974 | } | |
975 | +EXPORT_SYMBOL_GPL(__devcgroup_check_permission); | |
7f207e10 | 976 | diff --git a/security/security.c b/security/security.c |
43982f53 | 977 | index 1bc000f834e2..306f2c9f7ee2 100644 |
7f207e10 AM |
978 | --- a/security/security.c |
979 | +++ b/security/security.c | |
43982f53 | 980 | @@ -1036,6 +1036,7 @@ int security_path_rmdir(const struct path *dir, struct dentry *dentry) |
7f207e10 | 981 | return 0; |
c2c0f25c | 982 | return call_int_hook(path_rmdir, 0, dir, dentry); |
7f207e10 | 983 | } |
febd17d6 | 984 | +EXPORT_SYMBOL_GPL(security_path_rmdir); |
7f207e10 | 985 | |
5afbbe0d | 986 | int security_path_unlink(const struct path *dir, struct dentry *dentry) |
7f207e10 | 987 | { |
43982f53 | 988 | @@ -1052,6 +1053,7 @@ int security_path_symlink(const struct path *dir, struct dentry *dentry, |
7f207e10 | 989 | return 0; |
c2c0f25c | 990 | return call_int_hook(path_symlink, 0, dir, dentry, old_name); |
7f207e10 | 991 | } |
febd17d6 | 992 | +EXPORT_SYMBOL_GPL(security_path_symlink); |
7f207e10 | 993 | |
5afbbe0d | 994 | int security_path_link(struct dentry *old_dentry, const struct path *new_dir, |
7f207e10 | 995 | struct dentry *new_dentry) |
43982f53 | 996 | @@ -1060,6 +1062,7 @@ int security_path_link(struct dentry *old_dentry, const struct path *new_dir, |
7f207e10 | 997 | return 0; |
c2c0f25c | 998 | return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); |
7f207e10 | 999 | } |
febd17d6 | 1000 | +EXPORT_SYMBOL_GPL(security_path_link); |
7f207e10 | 1001 | |
5afbbe0d AM |
1002 | int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
1003 | const struct path *new_dir, struct dentry *new_dentry, | |
43982f53 | 1004 | @@ -1087,6 +1090,7 @@ int security_path_truncate(const struct path *path) |
7f207e10 | 1005 | return 0; |
c2c0f25c | 1006 | return call_int_hook(path_truncate, 0, path); |
7f207e10 | 1007 | } |
febd17d6 | 1008 | +EXPORT_SYMBOL_GPL(security_path_truncate); |
7f207e10 | 1009 | |
5afbbe0d | 1010 | int security_path_chmod(const struct path *path, umode_t mode) |
7eafdf33 | 1011 | { |
43982f53 | 1012 | @@ -1094,6 +1098,7 @@ int security_path_chmod(const struct path *path, umode_t mode) |
7f207e10 | 1013 | return 0; |
c2c0f25c | 1014 | return call_int_hook(path_chmod, 0, path, mode); |
7f207e10 | 1015 | } |
febd17d6 | 1016 | +EXPORT_SYMBOL_GPL(security_path_chmod); |
7f207e10 | 1017 | |
5afbbe0d | 1018 | int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
7f207e10 | 1019 | { |
43982f53 | 1020 | @@ -1101,6 +1106,7 @@ int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
7f207e10 | 1021 | return 0; |
c2c0f25c | 1022 | return call_int_hook(path_chown, 0, path, uid, gid); |
7f207e10 | 1023 | } |
febd17d6 | 1024 | +EXPORT_SYMBOL_GPL(security_path_chown); |
7f207e10 | 1025 | |
5afbbe0d | 1026 | int security_path_chroot(const struct path *path) |
7f207e10 | 1027 | { |
43982f53 | 1028 | @@ -1201,6 +1207,7 @@ int security_inode_permission(struct inode *inode, int mask) |
7f207e10 | 1029 | return 0; |
c2c0f25c | 1030 | return call_int_hook(inode_permission, 0, inode, mask); |
7f207e10 | 1031 | } |
febd17d6 | 1032 | +EXPORT_SYMBOL_GPL(security_inode_permission); |
7f207e10 | 1033 | |
1e00d052 | 1034 | int security_inode_setattr(struct dentry *dentry, struct iattr *attr) |
7f207e10 | 1035 | { |
43982f53 | 1036 | @@ -1378,6 +1385,7 @@ int security_file_permission(struct file *file, int mask) |
7f207e10 AM |
1037 | |
1038 | return fsnotify_perm(file, mask); | |
1039 | } | |
febd17d6 | 1040 | +EXPORT_SYMBOL_GPL(security_file_permission); |
7f207e10 AM |
1041 | |
1042 | int security_file_alloc(struct file *file) | |
1043 | { | |
7f207e10 | 1044 | diff -urN /usr/share/empty/Documentation/ABI/testing/debugfs-aufs linux/Documentation/ABI/testing/debugfs-aufs |
eca34b5c AM |
1045 | --- /usr/share/empty/Documentation/ABI/testing/debugfs-aufs 1970-01-01 01:00:00.000000000 +0100 |
1046 | +++ linux/Documentation/ABI/testing/debugfs-aufs 2019-07-11 15:42:14.455570938 +0200 | |
062440b3 | 1047 | @@ -0,0 +1,55 @@ |
7f207e10 AM |
1048 | +What: /debug/aufs/si_<id>/ |
1049 | +Date: March 2009 | |
f6b6e03d | 1050 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1051 | +Description: |
1052 | + Under /debug/aufs, a directory named si_<id> is created | |
1053 | + per aufs mount, where <id> is a unique id generated | |
1054 | + internally. | |
1facf9fc | 1055 | + |
86dc4139 AM |
1056 | +What: /debug/aufs/si_<id>/plink |
1057 | +Date: Apr 2013 | |
f6b6e03d | 1058 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
86dc4139 AM |
1059 | +Description: |
1060 | + It has three lines and shows the information about the | |
1061 | + pseudo-link. The first line is a single number | |
1062 | + representing a number of buckets. The second line is a | |
1063 | + number of pseudo-links per buckets (separated by a | |
1064 | + blank). The last line is a single number representing a | |
1065 | + total number of psedo-links. | |
1066 | + When the aufs mount option 'noplink' is specified, it | |
1067 | + will show "1\n0\n0\n". | |
1068 | + | |
7f207e10 AM |
1069 | +What: /debug/aufs/si_<id>/xib |
1070 | +Date: March 2009 | |
f6b6e03d | 1071 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1072 | +Description: |
1073 | + It shows the consumed blocks by xib (External Inode Number | |
1074 | + Bitmap), its block size and file size. | |
1075 | + When the aufs mount option 'noxino' is specified, it | |
1076 | + will be empty. About XINO files, see the aufs manual. | |
1077 | + | |
062440b3 | 1078 | +What: /debug/aufs/si_<id>/xi0, xi1 ... xiN and xiN-N |
7f207e10 | 1079 | +Date: March 2009 |
f6b6e03d | 1080 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1081 | +Description: |
1082 | + It shows the consumed blocks by xino (External Inode Number | |
1083 | + Translation Table), its link count, block size and file | |
1084 | + size. | |
062440b3 AM |
1085 | + Due to the file size limit, there may exist multiple |
1086 | + xino files per branch. In this case, "-N" is added to | |
1087 | + the filename and it corresponds to the index of the | |
1088 | + internal xino array. "-0" is omitted. | |
1089 | + When the aufs mount option 'noxino' is specified, Those | |
1090 | + entries won't exist. About XINO files, see the aufs | |
1091 | + manual. | |
7f207e10 AM |
1092 | + |
1093 | +What: /debug/aufs/si_<id>/xigen | |
1094 | +Date: March 2009 | |
f6b6e03d | 1095 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1096 | +Description: |
1097 | + It shows the consumed blocks by xigen (External Inode | |
1098 | + Generation Table), its block size and file size. | |
1099 | + If CONFIG_AUFS_EXPORT is disabled, this entry will not | |
1100 | + be created. | |
1101 | + When the aufs mount option 'noxino' is specified, it | |
1102 | + will be empty. About XINO files, see the aufs manual. | |
1103 | diff -urN /usr/share/empty/Documentation/ABI/testing/sysfs-aufs linux/Documentation/ABI/testing/sysfs-aufs | |
eca34b5c AM |
1104 | --- /usr/share/empty/Documentation/ABI/testing/sysfs-aufs 1970-01-01 01:00:00.000000000 +0100 |
1105 | +++ linux/Documentation/ABI/testing/sysfs-aufs 2019-07-11 15:42:14.455570938 +0200 | |
392086de | 1106 | @@ -0,0 +1,31 @@ |
7f207e10 AM |
1107 | +What: /sys/fs/aufs/si_<id>/ |
1108 | +Date: March 2009 | |
f6b6e03d | 1109 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1110 | +Description: |
1111 | + Under /sys/fs/aufs, a directory named si_<id> is created | |
1112 | + per aufs mount, where <id> is a unique id generated | |
1113 | + internally. | |
1114 | + | |
1115 | +What: /sys/fs/aufs/si_<id>/br0, br1 ... brN | |
1116 | +Date: March 2009 | |
f6b6e03d | 1117 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1118 | +Description: |
1119 | + It shows the abolute path of a member directory (which | |
1120 | + is called branch) in aufs, and its permission. | |
1121 | + | |
392086de AM |
1122 | +What: /sys/fs/aufs/si_<id>/brid0, brid1 ... bridN |
1123 | +Date: July 2013 | |
f6b6e03d | 1124 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
392086de AM |
1125 | +Description: |
1126 | + It shows the id of a member directory (which is called | |
1127 | + branch) in aufs. | |
1128 | + | |
7f207e10 AM |
1129 | +What: /sys/fs/aufs/si_<id>/xi_path |
1130 | +Date: March 2009 | |
f6b6e03d | 1131 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1132 | +Description: |
1133 | + It shows the abolute path of XINO (External Inode Number | |
1134 | + Bitmap, Translation Table and Generation Table) file | |
1135 | + even if it is the default path. | |
1136 | + When the aufs mount option 'noxino' is specified, it | |
1137 | + will be empty. About XINO files, see the aufs manual. | |
53392da6 | 1138 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt linux/Documentation/filesystems/aufs/design/01intro.txt |
eca34b5c | 1139 | --- /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1140 | +++ linux/Documentation/filesystems/aufs/design/01intro.txt 2020-01-27 10:57:18.162204582 +0100 |
1c60b727 | 1141 | @@ -0,0 +1,171 @@ |
53392da6 | 1142 | + |
016522bc | 1143 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
1144 | +# |
1145 | +# This program is free software; you can redistribute it and/or modify | |
1146 | +# it under the terms of the GNU General Public License as published by | |
1147 | +# the Free Software Foundation; either version 2 of the License, or | |
1148 | +# (at your option) any later version. | |
1149 | +# | |
1150 | +# This program is distributed in the hope that it will be useful, | |
1151 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1152 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1153 | +# GNU General Public License for more details. | |
1154 | +# | |
1155 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1156 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1157 | + |
1158 | +Introduction | |
1159 | +---------------------------------------- | |
1160 | + | |
3c1bdaff | 1161 | +aufs [ei ju: ef es] | /ey-yoo-ef-es/ | [a u f s] |
53392da6 AM |
1162 | +1. abbrev. for "advanced multi-layered unification filesystem". |
1163 | +2. abbrev. for "another unionfs". | |
1164 | +3. abbrev. for "auf das" in German which means "on the" in English. | |
1165 | + Ex. "Butter aufs Brot"(G) means "butter onto bread"(E). | |
1166 | + But "Filesystem aufs Filesystem" is hard to understand. | |
1c60b727 | 1167 | +4. abbrev. for "African Urban Fashion Show". |
53392da6 AM |
1168 | + |
1169 | +AUFS is a filesystem with features: | |
1170 | +- multi layered stackable unification filesystem, the member directory | |
1171 | + is called as a branch. | |
1172 | +- branch permission and attribute, 'readonly', 'real-readonly', | |
7e9cd9fe | 1173 | + 'readwrite', 'whiteout-able', 'link-able whiteout', etc. and their |
53392da6 AM |
1174 | + combination. |
1175 | +- internal "file copy-on-write". | |
1176 | +- logical deletion, whiteout. | |
1177 | +- dynamic branch manipulation, adding, deleting and changing permission. | |
1178 | +- allow bypassing aufs, user's direct branch access. | |
1179 | +- external inode number translation table and bitmap which maintains the | |
1180 | + persistent aufs inode number. | |
1181 | +- seekable directory, including NFS readdir. | |
1182 | +- file mapping, mmap and sharing pages. | |
1183 | +- pseudo-link, hardlink over branches. | |
1184 | +- loopback mounted filesystem as a branch. | |
1185 | +- several policies to select one among multiple writable branches. | |
1186 | +- revert a single systemcall when an error occurs in aufs. | |
1187 | +- and more... | |
1188 | + | |
1189 | + | |
1190 | +Multi Layered Stackable Unification Filesystem | |
1191 | +---------------------------------------------------------------------- | |
1192 | +Most people already knows what it is. | |
1193 | +It is a filesystem which unifies several directories and provides a | |
1194 | +merged single directory. When users access a file, the access will be | |
1195 | +passed/re-directed/converted (sorry, I am not sure which English word is | |
1196 | +correct) to the real file on the member filesystem. The member | |
1197 | +filesystem is called 'lower filesystem' or 'branch' and has a mode | |
1198 | +'readonly' and 'readwrite.' And the deletion for a file on the lower | |
1199 | +readonly branch is handled by creating 'whiteout' on the upper writable | |
1200 | +branch. | |
1201 | + | |
1202 | +On LKML, there have been discussions about UnionMount (Jan Blunck, | |
1203 | +Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took | |
1204 | +different approaches to implement the merged-view. | |
1205 | +The former tries putting it into VFS, and the latter implements as a | |
1206 | +separate filesystem. | |
1207 | +(If I misunderstand about these implementations, please let me know and | |
1208 | +I shall correct it. Because it is a long time ago when I read their | |
1209 | +source files last time). | |
1210 | + | |
1211 | +UnionMount's approach will be able to small, but may be hard to share | |
1212 | +branches between several UnionMount since the whiteout in it is | |
1213 | +implemented in the inode on branch filesystem and always | |
1214 | +shared. According to Bharata's post, readdir does not seems to be | |
1215 | +finished yet. | |
1216 | +There are several missing features known in this implementations such as | |
1217 | +- for users, the inode number may change silently. eg. copy-up. | |
1218 | +- link(2) may break by copy-up. | |
1219 | +- read(2) may get an obsoleted filedata (fstat(2) too). | |
1220 | +- fcntl(F_SETLK) may be broken by copy-up. | |
1221 | +- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after | |
1222 | + open(O_RDWR). | |
1223 | + | |
7e9cd9fe AM |
1224 | +In linux-3.18, "overlay" filesystem (formerly known as "overlayfs") was |
1225 | +merged into mainline. This is another implementation of UnionMount as a | |
1226 | +separated filesystem. All the limitations and known problems which | |
1227 | +UnionMount are equally inherited to "overlay" filesystem. | |
1228 | + | |
1229 | +Unionfs has a longer history. When I started implementing a stackable | |
1230 | +filesystem (Aug 2005), it already existed. It has virtual super_block, | |
1231 | +inode, dentry and file objects and they have an array pointing lower | |
1232 | +same kind objects. After contributing many patches for Unionfs, I | |
1233 | +re-started my project AUFS (Jun 2006). | |
53392da6 AM |
1234 | + |
1235 | +In AUFS, the structure of filesystem resembles to Unionfs, but I | |
1236 | +implemented my own ideas, approaches and enhancements and it became | |
1237 | +totally different one. | |
1238 | + | |
1239 | +Comparing DM snapshot and fs based implementation | |
1240 | +- the number of bytes to be copied between devices is much smaller. | |
1241 | +- the type of filesystem must be one and only. | |
1242 | +- the fs must be writable, no readonly fs, even for the lower original | |
1243 | + device. so the compression fs will not be usable. but if we use | |
1244 | + loopback mount, we may address this issue. | |
1245 | + for instance, | |
1246 | + mount /cdrom/squashfs.img /sq | |
1247 | + losetup /sq/ext2.img | |
1248 | + losetup /somewhere/cow | |
1249 | + dmsetup "snapshot /dev/loop0 /dev/loop1 ..." | |
1250 | +- it will be difficult (or needs more operations) to extract the | |
1251 | + difference between the original device and COW. | |
1252 | +- DM snapshot-merge may help a lot when users try merging. in the | |
1253 | + fs-layer union, users will use rsync(1). | |
1254 | + | |
7e9cd9fe AM |
1255 | +You may want to read my old paper "Filesystems in LiveCD" |
1256 | +(http://aufs.sourceforge.net/aufs2/report/sq/sq.pdf). | |
53392da6 | 1257 | + |
7e9cd9fe AM |
1258 | + |
1259 | +Several characters/aspects/persona of aufs | |
53392da6 AM |
1260 | +---------------------------------------------------------------------- |
1261 | + | |
7e9cd9fe | 1262 | +Aufs has several characters, aspects or persona. |
53392da6 AM |
1263 | +1. a filesystem, callee of VFS helper |
1264 | +2. sub-VFS, caller of VFS helper for branches | |
1265 | +3. a virtual filesystem which maintains persistent inode number | |
1266 | +4. reader/writer of files on branches such like an application | |
1267 | + | |
1268 | +1. Callee of VFS Helper | |
1269 | +As an ordinary linux filesystem, aufs is a callee of VFS. For instance, | |
1270 | +unlink(2) from an application reaches sys_unlink() kernel function and | |
1271 | +then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it | |
1272 | +calls filesystem specific unlink operation. Actually aufs implements the | |
1273 | +unlink operation but it behaves like a redirector. | |
1274 | + | |
1275 | +2. Caller of VFS Helper for Branches | |
1276 | +aufs_unlink() passes the unlink request to the branch filesystem as if | |
1277 | +it were called from VFS. So the called unlink operation of the branch | |
1278 | +filesystem acts as usual. As a caller of VFS helper, aufs should handle | |
1279 | +every necessary pre/post operation for the branch filesystem. | |
1280 | +- acquire the lock for the parent dir on a branch | |
1281 | +- lookup in a branch | |
1282 | +- revalidate dentry on a branch | |
1283 | +- mnt_want_write() for a branch | |
1284 | +- vfs_unlink() for a branch | |
1285 | +- mnt_drop_write() for a branch | |
1286 | +- release the lock on a branch | |
1287 | + | |
1288 | +3. Persistent Inode Number | |
1289 | +One of the most important issue for a filesystem is to maintain inode | |
1290 | +numbers. This is particularly important to support exporting a | |
1291 | +filesystem via NFS. Aufs is a virtual filesystem which doesn't have a | |
1292 | +backend block device for its own. But some storage is necessary to | |
7e9cd9fe AM |
1293 | +keep and maintain the inode numbers. It may be a large space and may not |
1294 | +suit to keep in memory. Aufs rents some space from its first writable | |
1295 | +branch filesystem (by default) and creates file(s) on it. These files | |
1296 | +are created by aufs internally and removed soon (currently) keeping | |
1297 | +opened. | |
53392da6 AM |
1298 | +Note: Because these files are removed, they are totally gone after |
1299 | + unmounting aufs. It means the inode numbers are not persistent | |
1300 | + across unmount or reboot. I have a plan to make them really | |
1301 | + persistent which will be important for aufs on NFS server. | |
1302 | + | |
1303 | +4. Read/Write Files Internally (copy-on-write) | |
1304 | +Because a branch can be readonly, when you write a file on it, aufs will | |
1305 | +"copy-up" it to the upper writable branch internally. And then write the | |
1306 | +originally requested thing to the file. Generally kernel doesn't | |
1307 | +open/read/write file actively. In aufs, even a single write may cause a | |
1308 | +internal "file copy". This behaviour is very similar to cp(1) command. | |
1309 | + | |
1310 | +Some people may think it is better to pass such work to user space | |
1311 | +helper, instead of doing in kernel space. Actually I am still thinking | |
1312 | +about it. But currently I have implemented it in kernel space. | |
1313 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt linux/Documentation/filesystems/aufs/design/02struct.txt | |
eca34b5c | 1314 | --- /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1315 | +++ linux/Documentation/filesystems/aufs/design/02struct.txt 2020-01-27 10:57:18.162204582 +0100 |
7e9cd9fe | 1316 | @@ -0,0 +1,258 @@ |
53392da6 | 1317 | + |
016522bc | 1318 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
1319 | +# |
1320 | +# This program is free software; you can redistribute it and/or modify | |
1321 | +# it under the terms of the GNU General Public License as published by | |
1322 | +# the Free Software Foundation; either version 2 of the License, or | |
1323 | +# (at your option) any later version. | |
1324 | +# | |
1325 | +# This program is distributed in the hope that it will be useful, | |
1326 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1327 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1328 | +# GNU General Public License for more details. | |
1329 | +# | |
1330 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1331 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1332 | + |
1333 | +Basic Aufs Internal Structure | |
1334 | + | |
1335 | +Superblock/Inode/Dentry/File Objects | |
1336 | +---------------------------------------------------------------------- | |
1337 | +As like an ordinary filesystem, aufs has its own | |
1338 | +superblock/inode/dentry/file objects. All these objects have a | |
1339 | +dynamically allocated array and store the same kind of pointers to the | |
1340 | +lower filesystem, branch. | |
1341 | +For example, when you build a union with one readwrite branch and one | |
1342 | +readonly, mounted /au, /rw and /ro respectively. | |
1343 | +- /au = /rw + /ro | |
1344 | +- /ro/fileA exists but /rw/fileA | |
1345 | + | |
1346 | +Aufs lookup operation finds /ro/fileA and gets dentry for that. These | |
1347 | +pointers are stored in a aufs dentry. The array in aufs dentry will be, | |
7e9cd9fe | 1348 | +- [0] = NULL (because /rw/fileA doesn't exist) |
53392da6 AM |
1349 | +- [1] = /ro/fileA |
1350 | + | |
1351 | +This style of an array is essentially same to the aufs | |
1352 | +superblock/inode/dentry/file objects. | |
1353 | + | |
1354 | +Because aufs supports manipulating branches, ie. add/delete/change | |
7e9cd9fe AM |
1355 | +branches dynamically, these objects has its own generation. When |
1356 | +branches are changed, the generation in aufs superblock is | |
1357 | +incremented. And a generation in other object are compared when it is | |
1358 | +accessed. When a generation in other objects are obsoleted, aufs | |
1359 | +refreshes the internal array. | |
53392da6 AM |
1360 | + |
1361 | + | |
1362 | +Superblock | |
1363 | +---------------------------------------------------------------------- | |
1364 | +Additionally aufs superblock has some data for policies to select one | |
1365 | +among multiple writable branches, XIB files, pseudo-links and kobject. | |
1366 | +See below in detail. | |
7e9cd9fe AM |
1367 | +About the policies which supports copy-down a directory, see |
1368 | +wbr_policy.txt too. | |
53392da6 AM |
1369 | + |
1370 | + | |
1371 | +Branch and XINO(External Inode Number Translation Table) | |
1372 | +---------------------------------------------------------------------- | |
1373 | +Every branch has its own xino (external inode number translation table) | |
1374 | +file. The xino file is created and unlinked by aufs internally. When two | |
1375 | +members of a union exist on the same filesystem, they share the single | |
1376 | +xino file. | |
1377 | +The struct of a xino file is simple, just a sequence of aufs inode | |
1378 | +numbers which is indexed by the lower inode number. | |
1379 | +In the above sample, assume the inode number of /ro/fileA is i111 and | |
1380 | +aufs assigns the inode number i999 for fileA. Then aufs writes 999 as | |
1381 | +4(8) bytes at 111 * 4(8) bytes offset in the xino file. | |
1382 | + | |
1383 | +When the inode numbers are not contiguous, the xino file will be sparse | |
1384 | +which has a hole in it and doesn't consume as much disk space as it | |
1385 | +might appear. If your branch filesystem consumes disk space for such | |
1386 | +holes, then you should specify 'xino=' option at mounting aufs. | |
1387 | + | |
7e9cd9fe AM |
1388 | +Aufs has a mount option to free the disk blocks for such holes in XINO |
1389 | +files on tmpfs or ramdisk. But it is not so effective actually. If you | |
1390 | +meet a problem of disk shortage due to XINO files, then you should try | |
1391 | +"tmpfs-ino.patch" (and "vfs-ino.patch" too) in aufs4-standalone.git. | |
1392 | +The patch localizes the assignment inumbers per tmpfs-mount and avoid | |
1393 | +the holes in XINO files. | |
1394 | + | |
53392da6 | 1395 | +Also a writable branch has three kinds of "whiteout bases". All these |
7e9cd9fe | 1396 | +are existed when the branch is joined to aufs, and their names are |
53392da6 AM |
1397 | +whiteout-ed doubly, so that users will never see their names in aufs |
1398 | +hierarchy. | |
7e9cd9fe | 1399 | +1. a regular file which will be hardlinked to all whiteouts. |
53392da6 | 1400 | +2. a directory to store a pseudo-link. |
7e9cd9fe | 1401 | +3. a directory to store an "orphan"-ed file temporary. |
53392da6 AM |
1402 | + |
1403 | +1. Whiteout Base | |
1404 | + When you remove a file on a readonly branch, aufs handles it as a | |
1405 | + logical deletion and creates a whiteout on the upper writable branch | |
1406 | + as a hardlink of this file in order not to consume inode on the | |
1407 | + writable branch. | |
1408 | +2. Pseudo-link Dir | |
1409 | + See below, Pseudo-link. | |
1410 | +3. Step-Parent Dir | |
1411 | + When "fileC" exists on the lower readonly branch only and it is | |
1412 | + opened and removed with its parent dir, and then user writes | |
1413 | + something into it, then aufs copies-up fileC to this | |
1414 | + directory. Because there is no other dir to store fileC. After | |
1415 | + creating a file under this dir, the file is unlinked. | |
1416 | + | |
1417 | +Because aufs supports manipulating branches, ie. add/delete/change | |
7e9cd9fe AM |
1418 | +dynamically, a branch has its own id. When the branch order changes, |
1419 | +aufs finds the new index by searching the branch id. | |
53392da6 AM |
1420 | + |
1421 | + | |
1422 | +Pseudo-link | |
1423 | +---------------------------------------------------------------------- | |
1424 | +Assume "fileA" exists on the lower readonly branch only and it is | |
1425 | +hardlinked to "fileB" on the branch. When you write something to fileA, | |
1426 | +aufs copies-up it to the upper writable branch. Additionally aufs | |
1427 | +creates a hardlink under the Pseudo-link Directory of the writable | |
1428 | +branch. The inode of a pseudo-link is kept in aufs super_block as a | |
1429 | +simple list. If fileB is read after unlinking fileA, aufs returns | |
1430 | +filedata from the pseudo-link instead of the lower readonly | |
1431 | +branch. Because the pseudo-link is based upon the inode, to keep the | |
7e9cd9fe | 1432 | +inode number by xino (see above) is essentially necessary. |
53392da6 AM |
1433 | + |
1434 | +All the hardlinks under the Pseudo-link Directory of the writable branch | |
1435 | +should be restored in a proper location later. Aufs provides a utility | |
1436 | +to do this. The userspace helpers executed at remounting and unmounting | |
1437 | +aufs by default. | |
1438 | +During this utility is running, it puts aufs into the pseudo-link | |
1439 | +maintenance mode. In this mode, only the process which began the | |
1440 | +maintenance mode (and its child processes) is allowed to operate in | |
1441 | +aufs. Some other processes which are not related to the pseudo-link will | |
1442 | +be allowed to run too, but the rest have to return an error or wait | |
1443 | +until the maintenance mode ends. If a process already acquires an inode | |
1444 | +mutex (in VFS), it has to return an error. | |
1445 | + | |
1446 | + | |
1447 | +XIB(external inode number bitmap) | |
1448 | +---------------------------------------------------------------------- | |
1449 | +Addition to the xino file per a branch, aufs has an external inode number | |
7e9cd9fe AM |
1450 | +bitmap in a superblock object. It is also an internal file such like a |
1451 | +xino file. | |
53392da6 AM |
1452 | +It is a simple bitmap to mark whether the aufs inode number is in-use or |
1453 | +not. | |
1454 | +To reduce the file I/O, aufs prepares a single memory page to cache xib. | |
1455 | + | |
7e9cd9fe | 1456 | +As well as XINO files, aufs has a feature to truncate/refresh XIB to |
53392da6 AM |
1457 | +reduce the number of consumed disk blocks for these files. |
1458 | + | |
1459 | + | |
1460 | +Virtual or Vertical Dir, and Readdir in Userspace | |
1461 | +---------------------------------------------------------------------- | |
1462 | +In order to support multiple layers (branches), aufs readdir operation | |
1463 | +constructs a virtual dir block on memory. For readdir, aufs calls | |
1464 | +vfs_readdir() internally for each dir on branches, merges their entries | |
1465 | +with eliminating the whiteout-ed ones, and sets it to file (dir) | |
1466 | +object. So the file object has its entry list until it is closed. The | |
1467 | +entry list will be updated when the file position is zero and becomes | |
7e9cd9fe | 1468 | +obsoleted. This decision is made in aufs automatically. |
53392da6 AM |
1469 | + |
1470 | +The dynamically allocated memory block for the name of entries has a | |
1471 | +unit of 512 bytes (by default) and stores the names contiguously (no | |
1472 | +padding). Another block for each entry is handled by kmem_cache too. | |
1473 | +During building dir blocks, aufs creates hash list and judging whether | |
1474 | +the entry is whiteouted by its upper branch or already listed. | |
1475 | +The merged result is cached in the corresponding inode object and | |
1476 | +maintained by a customizable life-time option. | |
1477 | + | |
1478 | +Some people may call it can be a security hole or invite DoS attack | |
1479 | +since the opened and once readdir-ed dir (file object) holds its entry | |
1480 | +list and becomes a pressure for system memory. But I'd say it is similar | |
1481 | +to files under /proc or /sys. The virtual files in them also holds a | |
1482 | +memory page (generally) while they are opened. When an idea to reduce | |
1483 | +memory for them is introduced, it will be applied to aufs too. | |
1484 | +For those who really hate this situation, I've developed readdir(3) | |
1485 | +library which operates this merging in userspace. You just need to set | |
1486 | +LD_PRELOAD environment variable, and aufs will not consume no memory in | |
1487 | +kernel space for readdir(3). | |
1488 | + | |
1489 | + | |
1490 | +Workqueue | |
1491 | +---------------------------------------------------------------------- | |
1492 | +Aufs sometimes requires privilege access to a branch. For instance, | |
1493 | +in copy-up/down operation. When a user process is going to make changes | |
1494 | +to a file which exists in the lower readonly branch only, and the mode | |
1495 | +of one of ancestor directories may not be writable by a user | |
1496 | +process. Here aufs copy-up the file with its ancestors and they may | |
1497 | +require privilege to set its owner/group/mode/etc. | |
1498 | +This is a typical case of a application character of aufs (see | |
1499 | +Introduction). | |
1500 | + | |
1501 | +Aufs uses workqueue synchronously for this case. It creates its own | |
1502 | +workqueue. The workqueue is a kernel thread and has privilege. Aufs | |
1503 | +passes the request to call mkdir or write (for example), and wait for | |
1504 | +its completion. This approach solves a problem of a signal handler | |
1505 | +simply. | |
1506 | +If aufs didn't adopt the workqueue and changed the privilege of the | |
7e9cd9fe AM |
1507 | +process, then the process may receive the unexpected SIGXFSZ or other |
1508 | +signals. | |
53392da6 AM |
1509 | + |
1510 | +Also aufs uses the system global workqueue ("events" kernel thread) too | |
1511 | +for asynchronous tasks, such like handling inotify/fsnotify, re-creating a | |
1512 | +whiteout base and etc. This is unrelated to a privilege. | |
1513 | +Most of aufs operation tries acquiring a rw_semaphore for aufs | |
1514 | +superblock at the beginning, at the same time waits for the completion | |
1515 | +of all queued asynchronous tasks. | |
1516 | + | |
1517 | + | |
1518 | +Whiteout | |
1519 | +---------------------------------------------------------------------- | |
1520 | +The whiteout in aufs is very similar to Unionfs's. That is represented | |
1521 | +by its filename. UnionMount takes an approach of a file mode, but I am | |
1522 | +afraid several utilities (find(1) or something) will have to support it. | |
1523 | + | |
1524 | +Basically the whiteout represents "logical deletion" which stops aufs to | |
1525 | +lookup further, but also it represents "dir is opaque" which also stop | |
7e9cd9fe | 1526 | +further lookup. |
53392da6 AM |
1527 | + |
1528 | +In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively. | |
1529 | +In order to make several functions in a single systemcall to be | |
1530 | +revertible, aufs adopts an approach to rename a directory to a temporary | |
1531 | +unique whiteouted name. | |
1532 | +For example, in rename(2) dir where the target dir already existed, aufs | |
1533 | +renames the target dir to a temporary unique whiteouted name before the | |
7e9cd9fe | 1534 | +actual rename on a branch, and then handles other actions (make it opaque, |
53392da6 AM |
1535 | +update the attributes, etc). If an error happens in these actions, aufs |
1536 | +simply renames the whiteouted name back and returns an error. If all are | |
1537 | +succeeded, aufs registers a function to remove the whiteouted unique | |
1538 | +temporary name completely and asynchronously to the system global | |
1539 | +workqueue. | |
1540 | + | |
1541 | + | |
1542 | +Copy-up | |
1543 | +---------------------------------------------------------------------- | |
1544 | +It is a well-known feature or concept. | |
1545 | +When user modifies a file on a readonly branch, aufs operate "copy-up" | |
1546 | +internally and makes change to the new file on the upper writable branch. | |
1547 | +When the trigger systemcall does not update the timestamps of the parent | |
1548 | +dir, aufs reverts it after copy-up. | |
c2b27bf2 AM |
1549 | + |
1550 | + | |
1551 | +Move-down (aufs3.9 and later) | |
1552 | +---------------------------------------------------------------------- | |
1553 | +"Copy-up" is one of the essential feature in aufs. It copies a file from | |
1554 | +the lower readonly branch to the upper writable branch when a user | |
1555 | +changes something about the file. | |
1556 | +"Move-down" is an opposite action of copy-up. Basically this action is | |
1557 | +ran manually instead of automatically and internally. | |
076b876e AM |
1558 | +For desgin and implementation, aufs has to consider these issues. |
1559 | +- whiteout for the file may exist on the lower branch. | |
1560 | +- ancestor directories may not exist on the lower branch. | |
1561 | +- diropq for the ancestor directories may exist on the upper branch. | |
1562 | +- free space on the lower branch will reduce. | |
1563 | +- another access to the file may happen during moving-down, including | |
7e9cd9fe | 1564 | + UDBA (see "Revalidate Dentry and UDBA"). |
076b876e AM |
1565 | +- the file should not be hard-linked nor pseudo-linked. they should be |
1566 | + handled by auplink utility later. | |
c2b27bf2 AM |
1567 | + |
1568 | +Sometimes users want to move-down a file from the upper writable branch | |
1569 | +to the lower readonly or writable branch. For instance, | |
1570 | +- the free space of the upper writable branch is going to run out. | |
1571 | +- create a new intermediate branch between the upper and lower branch. | |
1572 | +- etc. | |
1573 | + | |
1574 | +For this purpose, use "aumvdown" command in aufs-util.git. | |
b912730e | 1575 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/03atomic_open.txt linux/Documentation/filesystems/aufs/design/03atomic_open.txt |
eca34b5c | 1576 | --- /usr/share/empty/Documentation/filesystems/aufs/design/03atomic_open.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1577 | +++ linux/Documentation/filesystems/aufs/design/03atomic_open.txt 2020-01-27 10:57:18.162204582 +0100 |
b912730e AM |
1578 | @@ -0,0 +1,85 @@ |
1579 | + | |
016522bc | 1580 | +# Copyright (C) 2015-2020 Junjiro R. Okajima |
b912730e AM |
1581 | +# |
1582 | +# This program is free software; you can redistribute it and/or modify | |
1583 | +# it under the terms of the GNU General Public License as published by | |
1584 | +# the Free Software Foundation; either version 2 of the License, or | |
1585 | +# (at your option) any later version. | |
1586 | +# | |
1587 | +# This program is distributed in the hope that it will be useful, | |
1588 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1589 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1590 | +# GNU General Public License for more details. | |
1591 | +# | |
1592 | +# You should have received a copy of the GNU General Public License | |
1593 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
1594 | + | |
1595 | +Support for a branch who has its ->atomic_open() | |
1596 | +---------------------------------------------------------------------- | |
1597 | +The filesystems who implement its ->atomic_open() are not majority. For | |
1598 | +example NFSv4 does, and aufs should call NFSv4 ->atomic_open, | |
1599 | +particularly for open(O_CREAT|O_EXCL, 0400) case. Other than | |
1600 | +->atomic_open(), NFSv4 returns an error for this open(2). While I am not | |
1601 | +sure whether all filesystems who have ->atomic_open() behave like this, | |
1602 | +but NFSv4 surely returns the error. | |
1603 | + | |
1604 | +In order to support ->atomic_open() for aufs, there are a few | |
1605 | +approaches. | |
1606 | + | |
1607 | +A. Introduce aufs_atomic_open() | |
1608 | + - calls one of VFS:do_last(), lookup_open() or atomic_open() for | |
1609 | + branch fs. | |
1610 | +B. Introduce aufs_atomic_open() calling create, open and chmod. this is | |
1611 | + an aufs user Pip Cet's approach | |
1612 | + - calls aufs_create(), VFS finish_open() and notify_change(). | |
1613 | + - pass fake-mode to finish_open(), and then correct the mode by | |
1614 | + notify_change(). | |
1615 | +C. Extend aufs_open() to call branch fs's ->atomic_open() | |
1616 | + - no aufs_atomic_open(). | |
1617 | + - aufs_lookup() registers the TID to an aufs internal object. | |
1618 | + - aufs_create() does nothing when the matching TID is registered, but | |
1619 | + registers the mode. | |
1620 | + - aufs_open() calls branch fs's ->atomic_open() when the matching | |
1621 | + TID is registered. | |
1622 | +D. Extend aufs_open() to re-try branch fs's ->open() with superuser's | |
1623 | + credential | |
1624 | + - no aufs_atomic_open(). | |
1625 | + - aufs_create() registers the TID to an internal object. this info | |
1626 | + represents "this process created this file just now." | |
1627 | + - when aufs gets EACCES from branch fs's ->open(), then confirm the | |
1628 | + registered TID and re-try open() with superuser's credential. | |
1629 | + | |
1630 | +Pros and cons for each approach. | |
1631 | + | |
1632 | +A. | |
1633 | + - straightforward but highly depends upon VFS internal. | |
1634 | + - the atomic behavaiour is kept. | |
1635 | + - some of parameters such as nameidata are hard to reproduce for | |
1636 | + branch fs. | |
1637 | + - large overhead. | |
1638 | +B. | |
1639 | + - easy to implement. | |
1640 | + - the atomic behavaiour is lost. | |
1641 | +C. | |
1642 | + - the atomic behavaiour is kept. | |
1643 | + - dirty and tricky. | |
1644 | + - VFS checks whether the file is created correctly after calling | |
1645 | + ->create(), which means this approach doesn't work. | |
1646 | +D. | |
1647 | + - easy to implement. | |
1648 | + - the atomic behavaiour is lost. | |
1649 | + - to open a file with superuser's credential and give it to a user | |
1650 | + process is a bad idea, since the file object keeps the credential | |
1651 | + in it. It may affect LSM or something. This approach doesn't work | |
1652 | + either. | |
1653 | + | |
1654 | +The approach A is ideal, but it hard to implement. So here is a | |
1655 | +variation of A, which is to be implemented. | |
1656 | + | |
1657 | +A-1. Introduce aufs_atomic_open() | |
1658 | + - calls branch fs ->atomic_open() if exists. otherwise calls | |
1659 | + vfs_create() and finish_open(). | |
1660 | + - the demerit is that the several checks after branch fs | |
1661 | + ->atomic_open() are lost. in the ordinary case, the checks are | |
1662 | + done by VFS:do_last(), lookup_open() and atomic_open(). some can | |
1663 | + be implemented in aufs, but not all I am afraid. | |
53392da6 | 1664 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt linux/Documentation/filesystems/aufs/design/03lookup.txt |
eca34b5c | 1665 | --- /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1666 | +++ linux/Documentation/filesystems/aufs/design/03lookup.txt 2020-01-27 10:57:18.165538015 +0100 |
7e9cd9fe | 1667 | @@ -0,0 +1,113 @@ |
53392da6 | 1668 | + |
016522bc | 1669 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
1670 | +# |
1671 | +# This program is free software; you can redistribute it and/or modify | |
1672 | +# it under the terms of the GNU General Public License as published by | |
1673 | +# the Free Software Foundation; either version 2 of the License, or | |
1674 | +# (at your option) any later version. | |
1675 | +# | |
1676 | +# This program is distributed in the hope that it will be useful, | |
1677 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1678 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1679 | +# GNU General Public License for more details. | |
1680 | +# | |
1681 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1682 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1683 | + |
1684 | +Lookup in a Branch | |
1685 | +---------------------------------------------------------------------- | |
1686 | +Since aufs has a character of sub-VFS (see Introduction), it operates | |
7e9cd9fe AM |
1687 | +lookup for branches as VFS does. It may be a heavy work. But almost all |
1688 | +lookup operation in aufs is the simplest case, ie. lookup only an entry | |
1689 | +directly connected to its parent. Digging down the directory hierarchy | |
1690 | +is unnecessary. VFS has a function lookup_one_len() for that use, and | |
1691 | +aufs calls it. | |
1692 | + | |
1693 | +When a branch is a remote filesystem, aufs basically relies upon its | |
53392da6 AM |
1694 | +->d_revalidate(), also aufs forces the hardest revalidate tests for |
1695 | +them. | |
1696 | +For d_revalidate, aufs implements three levels of revalidate tests. See | |
1697 | +"Revalidate Dentry and UDBA" in detail. | |
1698 | + | |
1699 | + | |
076b876e AM |
1700 | +Test Only the Highest One for the Directory Permission (dirperm1 option) |
1701 | +---------------------------------------------------------------------- | |
1702 | +Let's try case study. | |
1703 | +- aufs has two branches, upper readwrite and lower readonly. | |
1704 | + /au = /rw + /ro | |
1705 | +- "dirA" exists under /ro, but /rw. and its mode is 0700. | |
1706 | +- user invoked "chmod a+rx /au/dirA" | |
1707 | +- the internal copy-up is activated and "/rw/dirA" is created and its | |
7e9cd9fe | 1708 | + permission bits are set to world readable. |
076b876e AM |
1709 | +- then "/au/dirA" becomes world readable? |
1710 | + | |
1711 | +In this case, /ro/dirA is still 0700 since it exists in readonly branch, | |
1712 | +or it may be a natively readonly filesystem. If aufs respects the lower | |
1713 | +branch, it should not respond readdir request from other users. But user | |
1714 | +allowed it by chmod. Should really aufs rejects showing the entries | |
1715 | +under /ro/dirA? | |
1716 | + | |
7e9cd9fe AM |
1717 | +To be honest, I don't have a good solution for this case. So aufs |
1718 | +implements 'dirperm1' and 'nodirperm1' mount options, and leave it to | |
1719 | +users. | |
076b876e AM |
1720 | +When dirperm1 is specified, aufs checks only the highest one for the |
1721 | +directory permission, and shows the entries. Otherwise, as usual, checks | |
1722 | +every dir existing on all branches and rejects the request. | |
1723 | + | |
1724 | +As a side effect, dirperm1 option improves the performance of aufs | |
1725 | +because the number of permission check is reduced when the number of | |
1726 | +branch is many. | |
1727 | + | |
1728 | + | |
53392da6 AM |
1729 | +Revalidate Dentry and UDBA (User's Direct Branch Access) |
1730 | +---------------------------------------------------------------------- | |
1731 | +Generally VFS helpers re-validate a dentry as a part of lookup. | |
1732 | +0. digging down the directory hierarchy. | |
1733 | +1. lock the parent dir by its i_mutex. | |
1734 | +2. lookup the final (child) entry. | |
1735 | +3. revalidate it. | |
1736 | +4. call the actual operation (create, unlink, etc.) | |
1737 | +5. unlock the parent dir | |
1738 | + | |
1739 | +If the filesystem implements its ->d_revalidate() (step 3), then it is | |
1740 | +called. Actually aufs implements it and checks the dentry on a branch is | |
1741 | +still valid. | |
1742 | +But it is not enough. Because aufs has to release the lock for the | |
1743 | +parent dir on a branch at the end of ->lookup() (step 2) and | |
1744 | +->d_revalidate() (step 3) while the i_mutex of the aufs dir is still | |
1745 | +held by VFS. | |
1746 | +If the file on a branch is changed directly, eg. bypassing aufs, after | |
1747 | +aufs released the lock, then the subsequent operation may cause | |
1748 | +something unpleasant result. | |
1749 | + | |
1750 | +This situation is a result of VFS architecture, ->lookup() and | |
1751 | +->d_revalidate() is separated. But I never say it is wrong. It is a good | |
1752 | +design from VFS's point of view. It is just not suitable for sub-VFS | |
1753 | +character in aufs. | |
1754 | + | |
1755 | +Aufs supports such case by three level of revalidation which is | |
1756 | +selectable by user. | |
1757 | +1. Simple Revalidate | |
1758 | + Addition to the native flow in VFS's, confirm the child-parent | |
1759 | + relationship on the branch just after locking the parent dir on the | |
1760 | + branch in the "actual operation" (step 4). When this validation | |
1761 | + fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still | |
1762 | + checks the validation of the dentry on branches. | |
1763 | +2. Monitor Changes Internally by Inotify/Fsnotify | |
1764 | + Addition to above, in the "actual operation" (step 4) aufs re-lookup | |
1765 | + the dentry on the branch, and returns EBUSY if it finds different | |
1766 | + dentry. | |
1767 | + Additionally, aufs sets the inotify/fsnotify watch for every dir on branches | |
1768 | + during it is in cache. When the event is notified, aufs registers a | |
1769 | + function to kernel 'events' thread by schedule_work(). And the | |
1770 | + function sets some special status to the cached aufs dentry and inode | |
1771 | + private data. If they are not cached, then aufs has nothing to | |
1772 | + do. When the same file is accessed through aufs (step 0-3) later, | |
1773 | + aufs will detect the status and refresh all necessary data. | |
1774 | + In this mode, aufs has to ignore the event which is fired by aufs | |
1775 | + itself. | |
1776 | +3. No Extra Validation | |
1777 | + This is the simplest test and doesn't add any additional revalidation | |
7e9cd9fe | 1778 | + test, and skip the revalidation in step 4. It is useful and improves |
53392da6 AM |
1779 | + aufs performance when system surely hide the aufs branches from user, |
1780 | + by over-mounting something (or another method). | |
1781 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt linux/Documentation/filesystems/aufs/design/04branch.txt | |
eca34b5c | 1782 | --- /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1783 | +++ linux/Documentation/filesystems/aufs/design/04branch.txt 2020-01-27 10:57:18.165538015 +0100 |
7e9cd9fe | 1784 | @@ -0,0 +1,74 @@ |
53392da6 | 1785 | + |
016522bc | 1786 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
1787 | +# |
1788 | +# This program is free software; you can redistribute it and/or modify | |
1789 | +# it under the terms of the GNU General Public License as published by | |
1790 | +# the Free Software Foundation; either version 2 of the License, or | |
1791 | +# (at your option) any later version. | |
1792 | +# | |
1793 | +# This program is distributed in the hope that it will be useful, | |
1794 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1795 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1796 | +# GNU General Public License for more details. | |
1797 | +# | |
1798 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1799 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1800 | + |
1801 | +Branch Manipulation | |
1802 | + | |
1803 | +Since aufs supports dynamic branch manipulation, ie. add/remove a branch | |
1804 | +and changing its permission/attribute, there are a lot of works to do. | |
1805 | + | |
1806 | + | |
1807 | +Add a Branch | |
1808 | +---------------------------------------------------------------------- | |
1809 | +o Confirm the adding dir exists outside of aufs, including loopback | |
7e9cd9fe | 1810 | + mount, and its various attributes. |
53392da6 AM |
1811 | +o Initialize the xino file and whiteout bases if necessary. |
1812 | + See struct.txt. | |
1813 | + | |
1814 | +o Check the owner/group/mode of the directory | |
1815 | + When the owner/group/mode of the adding directory differs from the | |
1816 | + existing branch, aufs issues a warning because it may impose a | |
1817 | + security risk. | |
1818 | + For example, when a upper writable branch has a world writable empty | |
1819 | + top directory, a malicious user can create any files on the writable | |
1820 | + branch directly, like copy-up and modify manually. If something like | |
1821 | + /etc/{passwd,shadow} exists on the lower readonly branch but the upper | |
1822 | + writable branch, and the writable branch is world-writable, then a | |
1823 | + malicious guy may create /etc/passwd on the writable branch directly | |
1824 | + and the infected file will be valid in aufs. | |
7e9cd9fe | 1825 | + I am afraid it can be a security issue, but aufs can do nothing except |
53392da6 AM |
1826 | + producing a warning. |
1827 | + | |
1828 | + | |
1829 | +Delete a Branch | |
1830 | +---------------------------------------------------------------------- | |
1831 | +o Confirm the deleting branch is not busy | |
1832 | + To be general, there is one merit to adopt "remount" interface to | |
1833 | + manipulate branches. It is to discard caches. At deleting a branch, | |
1834 | + aufs checks the still cached (and connected) dentries and inodes. If | |
1835 | + there are any, then they are all in-use. An inode without its | |
1836 | + corresponding dentry can be alive alone (for example, inotify/fsnotify case). | |
1837 | + | |
1838 | + For the cached one, aufs checks whether the same named entry exists on | |
1839 | + other branches. | |
1840 | + If the cached one is a directory, because aufs provides a merged view | |
1841 | + to users, as long as one dir is left on any branch aufs can show the | |
1842 | + dir to users. In this case, the branch can be removed from aufs. | |
1843 | + Otherwise aufs rejects deleting the branch. | |
1844 | + | |
1845 | + If any file on the deleting branch is opened by aufs, then aufs | |
1846 | + rejects deleting. | |
1847 | + | |
1848 | + | |
1849 | +Modify the Permission of a Branch | |
1850 | +---------------------------------------------------------------------- | |
1851 | +o Re-initialize or remove the xino file and whiteout bases if necessary. | |
1852 | + See struct.txt. | |
1853 | + | |
1854 | +o rw --> ro: Confirm the modifying branch is not busy | |
1855 | + Aufs rejects the request if any of these conditions are true. | |
1856 | + - a file on the branch is mmap-ed. | |
1857 | + - a regular file on the branch is opened for write and there is no | |
1858 | + same named entry on the upper branch. | |
1859 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt linux/Documentation/filesystems/aufs/design/05wbr_policy.txt | |
eca34b5c | 1860 | --- /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1861 | +++ linux/Documentation/filesystems/aufs/design/05wbr_policy.txt 2020-01-27 10:57:18.165538015 +0100 |
523b37e3 | 1862 | @@ -0,0 +1,64 @@ |
53392da6 | 1863 | + |
016522bc | 1864 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
1865 | +# |
1866 | +# This program is free software; you can redistribute it and/or modify | |
1867 | +# it under the terms of the GNU General Public License as published by | |
1868 | +# the Free Software Foundation; either version 2 of the License, or | |
1869 | +# (at your option) any later version. | |
1870 | +# | |
1871 | +# This program is distributed in the hope that it will be useful, | |
1872 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1873 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1874 | +# GNU General Public License for more details. | |
1875 | +# | |
1876 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1877 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1878 | + |
1879 | +Policies to Select One among Multiple Writable Branches | |
1880 | +---------------------------------------------------------------------- | |
1881 | +When the number of writable branch is more than one, aufs has to decide | |
1882 | +the target branch for file creation or copy-up. By default, the highest | |
1883 | +writable branch which has the parent (or ancestor) dir of the target | |
1884 | +file is chosen (top-down-parent policy). | |
1885 | +By user's request, aufs implements some other policies to select the | |
7e9cd9fe AM |
1886 | +writable branch, for file creation several policies, round-robin, |
1887 | +most-free-space, and other policies. For copy-up, top-down-parent, | |
1888 | +bottom-up-parent, bottom-up and others. | |
53392da6 AM |
1889 | + |
1890 | +As expected, the round-robin policy selects the branch in circular. When | |
1891 | +you have two writable branches and creates 10 new files, 5 files will be | |
1892 | +created for each branch. mkdir(2) systemcall is an exception. When you | |
1893 | +create 10 new directories, all will be created on the same branch. | |
1894 | +And the most-free-space policy selects the one which has most free | |
1895 | +space among the writable branches. The amount of free space will be | |
1896 | +checked by aufs internally, and users can specify its time interval. | |
1897 | + | |
1898 | +The policies for copy-up is more simple, | |
1899 | +top-down-parent is equivalent to the same named on in create policy, | |
1900 | +bottom-up-parent selects the writable branch where the parent dir | |
1901 | +exists and the nearest upper one from the copyup-source, | |
1902 | +bottom-up selects the nearest upper writable branch from the | |
1903 | +copyup-source, regardless the existence of the parent dir. | |
1904 | + | |
1905 | +There are some rules or exceptions to apply these policies. | |
1906 | +- If there is a readonly branch above the policy-selected branch and | |
1907 | + the parent dir is marked as opaque (a variation of whiteout), or the | |
1908 | + target (creating) file is whiteout-ed on the upper readonly branch, | |
1909 | + then the result of the policy is ignored and the target file will be | |
1910 | + created on the nearest upper writable branch than the readonly branch. | |
1911 | +- If there is a writable branch above the policy-selected branch and | |
1912 | + the parent dir is marked as opaque or the target file is whiteouted | |
1913 | + on the branch, then the result of the policy is ignored and the target | |
1914 | + file will be created on the highest one among the upper writable | |
1915 | + branches who has diropq or whiteout. In case of whiteout, aufs removes | |
1916 | + it as usual. | |
1917 | +- link(2) and rename(2) systemcalls are exceptions in every policy. | |
1918 | + They try selecting the branch where the source exists as possible | |
1919 | + since copyup a large file will take long time. If it can't be, | |
1920 | + ie. the branch where the source exists is readonly, then they will | |
1921 | + follow the copyup policy. | |
1922 | +- There is an exception for rename(2) when the target exists. | |
1923 | + If the rename target exists, aufs compares the index of the branches | |
1924 | + where the source and the target exists and selects the higher | |
1925 | + one. If the selected branch is readonly, then aufs follows the | |
1926 | + copyup policy. | |
8b6a4947 | 1927 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.dot linux/Documentation/filesystems/aufs/design/06dirren.dot |
eca34b5c AM |
1928 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.dot 1970-01-01 01:00:00.000000000 +0100 |
1929 | +++ linux/Documentation/filesystems/aufs/design/06dirren.dot 2019-07-11 15:42:14.458904362 +0200 | |
8b6a4947 AM |
1930 | @@ -0,0 +1,31 @@ |
1931 | + | |
1932 | +// to view this graph, run dot(1) command in GRAPHVIZ. | |
1933 | + | |
1934 | +digraph G { | |
1935 | +node [shape=box]; | |
1936 | +whinfo [label="detailed info file\n(lower_brid_root-hinum, h_inum, namelen, old name)"]; | |
1937 | + | |
1938 | +node [shape=oval]; | |
1939 | + | |
1940 | +aufs_rename -> whinfo [label="store/remove"]; | |
1941 | + | |
1942 | +node [shape=oval]; | |
1943 | +inode_list [label="h_inum list in branch\ncache"]; | |
1944 | + | |
1945 | +node [shape=box]; | |
1946 | +whinode [label="h_inum list file"]; | |
1947 | + | |
1948 | +node [shape=oval]; | |
1949 | +brmgmt [label="br_add/del/mod/umount"]; | |
1950 | + | |
1951 | +brmgmt -> inode_list [label="create/remove"]; | |
1952 | +brmgmt -> whinode [label="load/store"]; | |
1953 | + | |
1954 | +inode_list -> whinode [style=dashed,dir=both]; | |
1955 | + | |
1956 | +aufs_rename -> inode_list [label="add/del"]; | |
1957 | + | |
1958 | +aufs_lookup -> inode_list [label="search"]; | |
1959 | + | |
1960 | +aufs_lookup -> whinfo [label="load/remove"]; | |
1961 | +} | |
1962 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.txt linux/Documentation/filesystems/aufs/design/06dirren.txt | |
eca34b5c | 1963 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 1964 | +++ linux/Documentation/filesystems/aufs/design/06dirren.txt 2020-01-27 10:57:18.165538015 +0100 |
8b6a4947 AM |
1965 | @@ -0,0 +1,102 @@ |
1966 | + | |
016522bc | 1967 | +# Copyright (C) 2017-2020 Junjiro R. Okajima |
8b6a4947 AM |
1968 | +# |
1969 | +# This program is free software; you can redistribute it and/or modify | |
1970 | +# it under the terms of the GNU General Public License as published by | |
1971 | +# the Free Software Foundation; either version 2 of the License, or | |
1972 | +# (at your option) any later version. | |
1973 | +# | |
1974 | +# This program is distributed in the hope that it will be useful, | |
1975 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1976 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1977 | +# GNU General Public License for more details. | |
1978 | +# | |
1979 | +# You should have received a copy of the GNU General Public License | |
1980 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
1981 | + | |
1982 | +Special handling for renaming a directory (DIRREN) | |
1983 | +---------------------------------------------------------------------- | |
1984 | +First, let's assume we have a simple usecase. | |
1985 | + | |
1986 | +- /u = /rw + /ro | |
1987 | +- /rw/dirA exists | |
1988 | +- /ro/dirA and /ro/dirA/file exist too | |
1989 | +- there is no dirB on both branches | |
1990 | +- a user issues rename("dirA", "dirB") | |
1991 | + | |
1992 | +Now, what should aufs behave against this rename(2)? | |
1993 | +There are a few possible cases. | |
1994 | + | |
1995 | +A. returns EROFS. | |
1996 | + since dirA exists on a readonly branch which cannot be renamed. | |
1997 | +B. returns EXDEV. | |
1998 | + it is possible to copy-up dirA (only the dir itself), but the child | |
1999 | + entries ("file" in this case) should not be. it must be a bad | |
2000 | + approach to copy-up recursively. | |
2001 | +C. returns a success. | |
2002 | + even the branch /ro is readonly, aufs tries renaming it. Obviously it | |
2003 | + is a violation of aufs' policy. | |
2004 | +D. construct an extra information which indicates that /ro/dirA should | |
2005 | + be handled as the name of dirB. | |
2006 | + overlayfs has a similar feature called REDIRECT. | |
2007 | + | |
2008 | +Until now, aufs implements the case B only which returns EXDEV, and | |
2009 | +expects the userspace application behaves like mv(1) which tries | |
2010 | +issueing rename(2) recursively. | |
2011 | + | |
2012 | +A new aufs feature called DIRREN is introduced which implements the case | |
2013 | +D. There are several "extra information" added. | |
2014 | + | |
2015 | +1. detailed info per renamed directory | |
2016 | + path: /rw/dirB/$AUFS_WH_DR_INFO_PFX.<lower branch-id> | |
2017 | +2. the inode-number list of directories on a branch | |
2018 | + path: /rw/dirB/$AUFS_WH_DR_BRHINO | |
2019 | + | |
2020 | +The filename of "detailed info per directory" represents the lower | |
2021 | +branch, and its format is | |
2022 | +- a type of the branch id | |
2023 | + one of these. | |
2024 | + + uuid (not implemented yet) | |
2025 | + + fsid | |
2026 | + + dev | |
2027 | +- the inode-number of the branch root dir | |
2028 | + | |
2029 | +And it contains these info in a single regular file. | |
2030 | +- magic number | |
2031 | +- branch's inode-number of the logically renamed dir | |
2032 | +- the name of the before-renamed dir | |
2033 | + | |
2034 | +The "detailed info per directory" file is created in aufs rename(2), and | |
2035 | +loaded in any lookup. | |
2036 | +The info is considered in lookup for the matching case only. Here | |
2037 | +"matching" means that the root of branch (in the info filename) is same | |
2038 | +to the current looking-up branch. After looking-up the before-renamed | |
2039 | +name, the inode-number is compared. And the matched dentry is used. | |
2040 | + | |
2041 | +The "inode-number list of directories" is a regular file which contains | |
2042 | +simply the inode-numbers on the branch. The file is created or updated | |
2043 | +in removing the branch, and loaded in adding the branch. Its lifetime is | |
2044 | +equal to the branch. | |
2045 | +The list is refered in lookup, and when the current target inode is | |
2046 | +found in the list, the aufs tries loading the "detailed info per | |
2047 | +directory" and get the changed and valid name of the dir. | |
2048 | + | |
2049 | +Theoretically these "extra informaiton" may be able to be put into XATTR | |
2050 | +in the dir inode. But aufs doesn't choose this way because | |
2051 | +1. XATTR may not be supported by the branch (or its configuration) | |
2052 | +2. XATTR may have its size limit. | |
2053 | +3. XATTR may be less easy to convert than a regular file, when the | |
2054 | + format of the info is changed in the future. | |
2055 | +At the same time, I agree that the regular file approach is much slower | |
2056 | +than XATTR approach. So, in the future, aufs may take the XATTR or other | |
2057 | +better approach. | |
2058 | + | |
2059 | +This DIRREN feature is enabled by aufs configuration, and is activated | |
2060 | +by a new mount option. | |
2061 | + | |
2062 | +For the more complicated case, there is a work with UDBA option, which | |
2063 | +is to dected the direct access to the branches (by-passing aufs) and to | |
2064 | +maintain the cashes in aufs. Since a single cached aufs dentry may | |
2065 | +contains two names, before- and after-rename, the name comparision in | |
2066 | +UDBA handler may not work correctly. In this case, the behaviour will be | |
2067 | +equivalen to udba=reval case. | |
076b876e | 2068 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06fhsm.txt linux/Documentation/filesystems/aufs/design/06fhsm.txt |
eca34b5c | 2069 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06fhsm.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2070 | +++ linux/Documentation/filesystems/aufs/design/06fhsm.txt 2020-01-27 10:57:18.165538015 +0100 |
076b876e AM |
2071 | @@ -0,0 +1,120 @@ |
2072 | + | |
016522bc | 2073 | +# Copyright (C) 2011-2020 Junjiro R. Okajima |
076b876e AM |
2074 | +# |
2075 | +# This program is free software; you can redistribute it and/or modify | |
2076 | +# it under the terms of the GNU General Public License as published by | |
2077 | +# the Free Software Foundation; either version 2 of the License, or | |
2078 | +# (at your option) any later version. | |
2079 | +# | |
2080 | +# This program is distributed in the hope that it will be useful, | |
2081 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2082 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2083 | +# GNU General Public License for more details. | |
2084 | +# | |
2085 | +# You should have received a copy of the GNU General Public License | |
2086 | +# along with this program; if not, write to the Free Software | |
2087 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2088 | + | |
2089 | + | |
2090 | +File-based Hierarchical Storage Management (FHSM) | |
2091 | +---------------------------------------------------------------------- | |
2092 | +Hierarchical Storage Management (or HSM) is a well-known feature in the | |
2093 | +storage world. Aufs provides this feature as file-based with multiple | |
7e9cd9fe | 2094 | +writable branches, based upon the principle of "Colder, the Lower". |
076b876e | 2095 | +Here the word "colder" means that the less used files, and "lower" means |
7e9cd9fe | 2096 | +that the position in the order of the stacked branches vertically. |
076b876e AM |
2097 | +These multiple writable branches are prioritized, ie. the topmost one |
2098 | +should be the fastest drive and be used heavily. | |
2099 | + | |
2100 | +o Characters in aufs FHSM story | |
2101 | +- aufs itself and a new branch attribute. | |
2102 | +- a new ioctl interface to move-down and to establish a connection with | |
2103 | + the daemon ("move-down" is a converse of "copy-up"). | |
2104 | +- userspace tool and daemon. | |
2105 | + | |
2106 | +The userspace daemon establishes a connection with aufs and waits for | |
2107 | +the notification. The notified information is very similar to struct | |
2108 | +statfs containing the number of consumed blocks and inodes. | |
2109 | +When the consumed blocks/inodes of a branch exceeds the user-specified | |
2110 | +upper watermark, the daemon activates its move-down process until the | |
2111 | +consumed blocks/inodes reaches the user-specified lower watermark. | |
2112 | + | |
2113 | +The actual move-down is done by aufs based upon the request from | |
2114 | +user-space since we need to maintain the inode number and the internal | |
2115 | +pointer arrays in aufs. | |
2116 | + | |
2117 | +Currently aufs FHSM handles the regular files only. Additionally they | |
2118 | +must not be hard-linked nor pseudo-linked. | |
2119 | + | |
2120 | + | |
2121 | +o Cowork of aufs and the user-space daemon | |
2122 | + During the userspace daemon established the connection, aufs sends a | |
2123 | + small notification to it whenever aufs writes something into the | |
2124 | + writable branch. But it may cost high since aufs issues statfs(2) | |
2125 | + internally. So user can specify a new option to cache the | |
2126 | + info. Actually the notification is controlled by these factors. | |
2127 | + + the specified cache time. | |
2128 | + + classified as "force" by aufs internally. | |
2129 | + Until the specified time expires, aufs doesn't send the info | |
2130 | + except the forced cases. When aufs decide forcing, the info is always | |
2131 | + notified to userspace. | |
2132 | + For example, the number of free inodes is generally large enough and | |
2133 | + the shortage of it happens rarely. So aufs doesn't force the | |
2134 | + notification when creating a new file, directory and others. This is | |
2135 | + the typical case which aufs doesn't force. | |
2136 | + When aufs writes the actual filedata and the files consumes any of new | |
2137 | + blocks, the aufs forces notifying. | |
2138 | + | |
2139 | + | |
2140 | +o Interfaces in aufs | |
2141 | +- New branch attribute. | |
2142 | + + fhsm | |
2143 | + Specifies that the branch is managed by FHSM feature. In other word, | |
2144 | + participant in the FHSM. | |
2145 | + When nofhsm is set to the branch, it will not be the source/target | |
2146 | + branch of the move-down operation. This attribute is set | |
2147 | + independently from coo and moo attributes, and if you want full | |
2148 | + FHSM, you should specify them as well. | |
2149 | +- New mount option. | |
2150 | + + fhsm_sec | |
2151 | + Specifies a second to suppress many less important info to be | |
2152 | + notified. | |
2153 | +- New ioctl. | |
2154 | + + AUFS_CTL_FHSM_FD | |
2155 | + create a new file descriptor which userspace can read the notification | |
2156 | + (a subset of struct statfs) from aufs. | |
2157 | +- Module parameter 'brs' | |
2158 | + It has to be set to 1. Otherwise the new mount option 'fhsm' will not | |
2159 | + be set. | |
2160 | +- mount helpers /sbin/mount.aufs and /sbin/umount.aufs | |
2161 | + When there are two or more branches with fhsm attributes, | |
2162 | + /sbin/mount.aufs invokes the user-space daemon and /sbin/umount.aufs | |
2163 | + terminates it. As a result of remounting and branch-manipulation, the | |
2164 | + number of branches with fhsm attribute can be one. In this case, | |
2165 | + /sbin/mount.aufs will terminate the user-space daemon. | |
2166 | + | |
2167 | + | |
2168 | +Finally the operation is done as these steps in kernel-space. | |
2169 | +- make sure that, | |
2170 | + + no one else is using the file. | |
2171 | + + the file is not hard-linked. | |
2172 | + + the file is not pseudo-linked. | |
2173 | + + the file is a regular file. | |
2174 | + + the parent dir is not opaqued. | |
2175 | +- find the target writable branch. | |
2176 | +- make sure the file is not whiteout-ed by the upper (than the target) | |
2177 | + branch. | |
2178 | +- make the parent dir on the target branch. | |
2179 | +- mutex lock the inode on the branch. | |
2180 | +- unlink the whiteout on the target branch (if exists). | |
2181 | +- lookup and create the whiteout-ed temporary name on the target branch. | |
2182 | +- copy the file as the whiteout-ed temporary name on the target branch. | |
2183 | +- rename the whiteout-ed temporary name to the original name. | |
2184 | +- unlink the file on the source branch. | |
2185 | +- maintain the internal pointer array and the external inode number | |
2186 | + table (XINO). | |
2187 | +- maintain the timestamps and other attributes of the parent dir and the | |
2188 | + file. | |
2189 | + | |
2190 | +And of course, in every step, an error may happen. So the operation | |
2191 | +should restore the original file state after an error happens. | |
53392da6 | 2192 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt linux/Documentation/filesystems/aufs/design/06mmap.txt |
eca34b5c | 2193 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2194 | +++ linux/Documentation/filesystems/aufs/design/06mmap.txt 2020-01-27 10:57:18.165538015 +0100 |
b912730e | 2195 | @@ -0,0 +1,72 @@ |
53392da6 | 2196 | + |
016522bc | 2197 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
2198 | +# |
2199 | +# This program is free software; you can redistribute it and/or modify | |
2200 | +# it under the terms of the GNU General Public License as published by | |
2201 | +# the Free Software Foundation; either version 2 of the License, or | |
2202 | +# (at your option) any later version. | |
2203 | +# | |
2204 | +# This program is distributed in the hope that it will be useful, | |
2205 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2206 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2207 | +# GNU General Public License for more details. | |
2208 | +# | |
2209 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2210 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2211 | + |
2212 | +mmap(2) -- File Memory Mapping | |
2213 | +---------------------------------------------------------------------- | |
2214 | +In aufs, the file-mapped pages are handled by a branch fs directly, no | |
2215 | +interaction with aufs. It means aufs_mmap() calls the branch fs's | |
2216 | +->mmap(). | |
2217 | +This approach is simple and good, but there is one problem. | |
7e9cd9fe | 2218 | +Under /proc, several entries show the mmapped files by its path (with |
53392da6 AM |
2219 | +device and inode number), and the printed path will be the path on the |
2220 | +branch fs's instead of virtual aufs's. | |
2221 | +This is not a problem in most cases, but some utilities lsof(1) (and its | |
2222 | +user) may expect the path on aufs. | |
2223 | + | |
2224 | +To address this issue, aufs adds a new member called vm_prfile in struct | |
2225 | +vm_area_struct (and struct vm_region). The original vm_file points to | |
2226 | +the file on the branch fs in order to handle everything correctly as | |
2227 | +usual. The new vm_prfile points to a virtual file in aufs, and the | |
2228 | +show-functions in procfs refers to vm_prfile if it is set. | |
2229 | +Also we need to maintain several other places where touching vm_file | |
2230 | +such like | |
2231 | +- fork()/clone() copies vma and the reference count of vm_file is | |
2232 | + incremented. | |
2233 | +- merging vma maintains the ref count too. | |
2234 | + | |
7e9cd9fe | 2235 | +This is not a good approach. It just fakes the printed path. But it |
53392da6 AM |
2236 | +leaves all behaviour around f_mapping unchanged. This is surely an |
2237 | +advantage. | |
2238 | +Actually aufs had adopted another complicated approach which calls | |
2239 | +generic_file_mmap() and handles struct vm_operations_struct. In this | |
2240 | +approach, aufs met a hard problem and I could not solve it without | |
2241 | +switching the approach. | |
b912730e AM |
2242 | + |
2243 | +There may be one more another approach which is | |
2244 | +- bind-mount the branch-root onto the aufs-root internally | |
2245 | +- grab the new vfsmount (ie. struct mount) | |
2246 | +- lazy-umount the branch-root internally | |
2247 | +- in open(2) the aufs-file, open the branch-file with the hidden | |
2248 | + vfsmount (instead of the original branch's vfsmount) | |
2249 | +- ideally this "bind-mount and lazy-umount" should be done atomically, | |
2250 | + but it may be possible from userspace by the mount helper. | |
2251 | + | |
2252 | +Adding the internal hidden vfsmount and using it in opening a file, the | |
2253 | +file path under /proc will be printed correctly. This approach looks | |
2254 | +smarter, but is not possible I am afraid. | |
2255 | +- aufs-root may be bind-mount later. when it happens, another hidden | |
2256 | + vfsmount will be required. | |
2257 | +- it is hard to get the chance to bind-mount and lazy-umount | |
2258 | + + in kernel-space, FS can have vfsmount in open(2) via | |
2259 | + file->f_path, and aufs can know its vfsmount. But several locks are | |
2260 | + already acquired, and if aufs tries to bind-mount and lazy-umount | |
2261 | + here, then it may cause a deadlock. | |
2262 | + + in user-space, bind-mount doesn't invoke the mount helper. | |
2263 | +- since /proc shows dev and ino, aufs has to give vma these info. it | |
2264 | + means a new member vm_prinode will be necessary. this is essentially | |
2265 | + equivalent to vm_prfile described above. | |
2266 | + | |
2267 | +I have to give up this "looks-smater" approach. | |
c1595e42 | 2268 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06xattr.txt linux/Documentation/filesystems/aufs/design/06xattr.txt |
eca34b5c | 2269 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06xattr.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2270 | +++ linux/Documentation/filesystems/aufs/design/06xattr.txt 2020-01-27 10:57:18.165538015 +0100 |
c1595e42 JR |
2271 | @@ -0,0 +1,96 @@ |
2272 | + | |
016522bc | 2273 | +# Copyright (C) 2014-2020 Junjiro R. Okajima |
c1595e42 JR |
2274 | +# |
2275 | +# This program is free software; you can redistribute it and/or modify | |
2276 | +# it under the terms of the GNU General Public License as published by | |
2277 | +# the Free Software Foundation; either version 2 of the License, or | |
2278 | +# (at your option) any later version. | |
2279 | +# | |
2280 | +# This program is distributed in the hope that it will be useful, | |
2281 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2282 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2283 | +# GNU General Public License for more details. | |
2284 | +# | |
2285 | +# You should have received a copy of the GNU General Public License | |
2286 | +# along with this program; if not, write to the Free Software | |
2287 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2288 | + | |
2289 | + | |
2290 | +Listing XATTR/EA and getting the value | |
2291 | +---------------------------------------------------------------------- | |
2292 | +For the inode standard attributes (owner, group, timestamps, etc.), aufs | |
2293 | +shows the values from the topmost existing file. This behaviour is good | |
7e9cd9fe | 2294 | +for the non-dir entries since the bahaviour exactly matches the shown |
c1595e42 JR |
2295 | +information. But for the directories, aufs considers all the same named |
2296 | +entries on the lower branches. Which means, if one of the lower entry | |
2297 | +rejects readdir call, then aufs returns an error even if the topmost | |
2298 | +entry allows it. This behaviour is necessary to respect the branch fs's | |
2299 | +security, but can make users confused since the user-visible standard | |
2300 | +attributes don't match the behaviour. | |
2301 | +To address this issue, aufs has a mount option called dirperm1 which | |
2302 | +checks the permission for the topmost entry only, and ignores the lower | |
2303 | +entry's permission. | |
2304 | + | |
2305 | +A similar issue can happen around XATTR. | |
2306 | +getxattr(2) and listxattr(2) families behave as if dirperm1 option is | |
7e9cd9fe AM |
2307 | +always set. Otherwise these very unpleasant situation would happen. |
2308 | +- listxattr(2) may return the duplicated entries. | |
c1595e42 JR |
2309 | +- users may not be able to remove or reset the XATTR forever, |
2310 | + | |
2311 | + | |
2312 | +XATTR/EA support in the internal (copy,move)-(up,down) | |
2313 | +---------------------------------------------------------------------- | |
7e9cd9fe | 2314 | +Generally the extended attributes of inode are categorized as these. |
c1595e42 JR |
2315 | +- "security" for LSM and capability. |
2316 | +- "system" for posix ACL, 'acl' mount option is required for the branch | |
2317 | + fs generally. | |
2318 | +- "trusted" for userspace, CAP_SYS_ADMIN is required. | |
2319 | +- "user" for userspace, 'user_xattr' mount option is required for the | |
2320 | + branch fs generally. | |
2321 | + | |
2322 | +Moreover there are some other categories. Aufs handles these rather | |
2323 | +unpopular categories as the ordinary ones, ie. there is no special | |
2324 | +condition nor exception. | |
2325 | + | |
2326 | +In copy-up, the support for XATTR on the dst branch may differ from the | |
2327 | +src branch. In this case, the copy-up operation will get an error and | |
7e9cd9fe AM |
2328 | +the original user operation which triggered the copy-up will fail. It |
2329 | +can happen that even all copy-up will fail. | |
c1595e42 JR |
2330 | +When both of src and dst branches support XATTR and if an error occurs |
2331 | +during copying XATTR, then the copy-up should fail obviously. That is a | |
2332 | +good reason and aufs should return an error to userspace. But when only | |
7e9cd9fe | 2333 | +the src branch support that XATTR, aufs should not return an error. |
c1595e42 JR |
2334 | +For example, the src branch supports ACL but the dst branch doesn't |
2335 | +because the dst branch may natively un-support it or temporary | |
2336 | +un-support it due to "noacl" mount option. Of course, the dst branch fs | |
2337 | +may NOT return an error even if the XATTR is not supported. It is | |
2338 | +totally up to the branch fs. | |
2339 | + | |
2340 | +Anyway when the aufs internal copy-up gets an error from the dst branch | |
2341 | +fs, then aufs tries removing the just copied entry and returns the error | |
2342 | +to the userspace. The worst case of this situation will be all copy-up | |
2343 | +will fail. | |
2344 | + | |
2345 | +For the copy-up operation, there two basic approaches. | |
2346 | +- copy the specified XATTR only (by category above), and return the | |
7e9cd9fe | 2347 | + error unconditionally if it happens. |
c1595e42 JR |
2348 | +- copy all XATTR, and ignore the error on the specified category only. |
2349 | + | |
2350 | +In order to support XATTR and to implement the correct behaviour, aufs | |
7e9cd9fe AM |
2351 | +chooses the latter approach and introduces some new branch attributes, |
2352 | +"icexsec", "icexsys", "icextr", "icexusr", and "icexoth". | |
c1595e42 | 2353 | +They correspond to the XATTR namespaces (see above). Additionally, to be |
7e9cd9fe AM |
2354 | +convenient, "icex" is also provided which means all "icex*" attributes |
2355 | +are set (here the word "icex" stands for "ignore copy-error on XATTR"). | |
c1595e42 JR |
2356 | + |
2357 | +The meaning of these attributes is to ignore the error from setting | |
2358 | +XATTR on that branch. | |
2359 | +Note that aufs tries copying all XATTR unconditionally, and ignores the | |
2360 | +error from the dst branch according to the specified attributes. | |
2361 | + | |
2362 | +Some XATTR may have its default value. The default value may come from | |
2363 | +the parent dir or the environment. If the default value is set at the | |
2364 | +file creating-time, it will be overwritten by copy-up. | |
2365 | +Some contradiction may happen I am afraid. | |
2366 | +Do we need another attribute to stop copying XATTR? I am unsure. For | |
2367 | +now, aufs implements the branch attributes to ignore the error. | |
53392da6 | 2368 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt linux/Documentation/filesystems/aufs/design/07export.txt |
eca34b5c | 2369 | --- /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2370 | +++ linux/Documentation/filesystems/aufs/design/07export.txt 2020-01-27 10:57:18.165538015 +0100 |
523b37e3 | 2371 | @@ -0,0 +1,58 @@ |
53392da6 | 2372 | + |
016522bc | 2373 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
2374 | +# |
2375 | +# This program is free software; you can redistribute it and/or modify | |
2376 | +# it under the terms of the GNU General Public License as published by | |
2377 | +# the Free Software Foundation; either version 2 of the License, or | |
2378 | +# (at your option) any later version. | |
2379 | +# | |
2380 | +# This program is distributed in the hope that it will be useful, | |
2381 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2382 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2383 | +# GNU General Public License for more details. | |
2384 | +# | |
2385 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2386 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2387 | + |
2388 | +Export Aufs via NFS | |
2389 | +---------------------------------------------------------------------- | |
2390 | +Here is an approach. | |
2391 | +- like xino/xib, add a new file 'xigen' which stores aufs inode | |
2392 | + generation. | |
2393 | +- iget_locked(): initialize aufs inode generation for a new inode, and | |
2394 | + store it in xigen file. | |
2395 | +- destroy_inode(): increment aufs inode generation and store it in xigen | |
2396 | + file. it is necessary even if it is not unlinked, because any data of | |
2397 | + inode may be changed by UDBA. | |
2398 | +- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise | |
2399 | + build file handle by | |
2400 | + + branch id (4 bytes) | |
2401 | + + superblock generation (4 bytes) | |
2402 | + + inode number (4 or 8 bytes) | |
2403 | + + parent dir inode number (4 or 8 bytes) | |
2404 | + + inode generation (4 bytes)) | |
2405 | + + return value of exportfs_encode_fh() for the parent on a branch (4 | |
2406 | + bytes) | |
2407 | + + file handle for a branch (by exportfs_encode_fh()) | |
2408 | +- fh_to_dentry(): | |
2409 | + + find the index of a branch from its id in handle, and check it is | |
2410 | + still exist in aufs. | |
2411 | + + 1st level: get the inode number from handle and search it in cache. | |
7e9cd9fe AM |
2412 | + + 2nd level: if not found in cache, get the parent inode number from |
2413 | + the handle and search it in cache. and then open the found parent | |
2414 | + dir, find the matching inode number by vfs_readdir() and get its | |
2415 | + name, and call lookup_one_len() for the target dentry. | |
53392da6 AM |
2416 | + + 3rd level: if the parent dir is not cached, call |
2417 | + exportfs_decode_fh() for a branch and get the parent on a branch, | |
2418 | + build a pathname of it, convert it a pathname in aufs, call | |
2419 | + path_lookup(). now aufs gets a parent dir dentry, then handle it as | |
2420 | + the 2nd level. | |
2421 | + + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount | |
2422 | + for every branch, but not itself. to get this, (currently) aufs | |
2423 | + searches in current->nsproxy->mnt_ns list. it may not be a good | |
2424 | + idea, but I didn't get other approach. | |
2425 | + + test the generation of the gotten inode. | |
2426 | +- every inode operation: they may get EBUSY due to UDBA. in this case, | |
2427 | + convert it into ESTALE for NFSD. | |
2428 | +- readdir(): call lockdep_on/off() because filldir in NFSD calls | |
2429 | + lookup_one_len(), vfs_getattr(), encode_fh() and others. | |
2430 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt linux/Documentation/filesystems/aufs/design/08shwh.txt | |
eca34b5c | 2431 | --- /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2432 | +++ linux/Documentation/filesystems/aufs/design/08shwh.txt 2020-01-27 10:57:18.165538015 +0100 |
523b37e3 | 2433 | @@ -0,0 +1,52 @@ |
53392da6 | 2434 | + |
016522bc | 2435 | +# Copyright (C) 2005-2020 Junjiro R. Okajima |
53392da6 AM |
2436 | +# |
2437 | +# This program is free software; you can redistribute it and/or modify | |
2438 | +# it under the terms of the GNU General Public License as published by | |
2439 | +# the Free Software Foundation; either version 2 of the License, or | |
2440 | +# (at your option) any later version. | |
2441 | +# | |
2442 | +# This program is distributed in the hope that it will be useful, | |
2443 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2444 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2445 | +# GNU General Public License for more details. | |
2446 | +# | |
2447 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2448 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2449 | + |
2450 | +Show Whiteout Mode (shwh) | |
2451 | +---------------------------------------------------------------------- | |
2452 | +Generally aufs hides the name of whiteouts. But in some cases, to show | |
2453 | +them is very useful for users. For instance, creating a new middle layer | |
2454 | +(branch) by merging existing layers. | |
2455 | + | |
2456 | +(borrowing aufs1 HOW-TO from a user, Michael Towers) | |
2457 | +When you have three branches, | |
2458 | +- Bottom: 'system', squashfs (underlying base system), read-only | |
2459 | +- Middle: 'mods', squashfs, read-only | |
2460 | +- Top: 'overlay', ram (tmpfs), read-write | |
2461 | + | |
2462 | +The top layer is loaded at boot time and saved at shutdown, to preserve | |
2463 | +the changes made to the system during the session. | |
2464 | +When larger changes have been made, or smaller changes have accumulated, | |
2465 | +the size of the saved top layer data grows. At this point, it would be | |
2466 | +nice to be able to merge the two overlay branches ('mods' and 'overlay') | |
2467 | +and rewrite the 'mods' squashfs, clearing the top layer and thus | |
2468 | +restoring save and load speed. | |
2469 | + | |
2470 | +This merging is simplified by the use of another aufs mount, of just the | |
2471 | +two overlay branches using the 'shwh' option. | |
2472 | +# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \ | |
2473 | + aufs /livesys/merge_union | |
2474 | + | |
2475 | +A merged view of these two branches is then available at | |
2476 | +/livesys/merge_union, and the new feature is that the whiteouts are | |
2477 | +visible! | |
2478 | +Note that in 'shwh' mode the aufs mount must be 'ro', which will disable | |
2479 | +writing to all branches. Also the default mode for all branches is 'ro'. | |
2480 | +It is now possible to save the combined contents of the two overlay | |
2481 | +branches to a new squashfs, e.g.: | |
2482 | +# mksquashfs /livesys/merge_union /path/to/newmods.squash | |
2483 | + | |
2484 | +This new squashfs archive can be stored on the boot device and the | |
2485 | +initramfs will use it to replace the old one at the next boot. | |
2486 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt linux/Documentation/filesystems/aufs/design/10dynop.txt | |
eca34b5c | 2487 | --- /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2488 | +++ linux/Documentation/filesystems/aufs/design/10dynop.txt 2020-01-27 10:57:18.165538015 +0100 |
7e9cd9fe | 2489 | @@ -0,0 +1,47 @@ |
53392da6 | 2490 | + |
016522bc | 2491 | +# Copyright (C) 2010-2020 Junjiro R. Okajima |
53392da6 AM |
2492 | +# |
2493 | +# This program is free software; you can redistribute it and/or modify | |
2494 | +# it under the terms of the GNU General Public License as published by | |
2495 | +# the Free Software Foundation; either version 2 of the License, or | |
2496 | +# (at your option) any later version. | |
2497 | +# | |
2498 | +# This program is distributed in the hope that it will be useful, | |
2499 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2500 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2501 | +# GNU General Public License for more details. | |
2502 | +# | |
2503 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2504 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2505 | + |
2506 | +Dynamically customizable FS operations | |
2507 | +---------------------------------------------------------------------- | |
2508 | +Generally FS operations (struct inode_operations, struct | |
2509 | +address_space_operations, struct file_operations, etc.) are defined as | |
2510 | +"static const", but it never means that FS have only one set of | |
2511 | +operation. Some FS have multiple sets of them. For instance, ext2 has | |
2512 | +three sets, one for XIP, for NOBH, and for normal. | |
2513 | +Since aufs overrides and redirects these operations, sometimes aufs has | |
7e9cd9fe | 2514 | +to change its behaviour according to the branch FS type. More importantly |
53392da6 AM |
2515 | +VFS acts differently if a function (member in the struct) is set or |
2516 | +not. It means aufs should have several sets of operations and select one | |
2517 | +among them according to the branch FS definition. | |
2518 | + | |
7e9cd9fe | 2519 | +In order to solve this problem and not to affect the behaviour of VFS, |
53392da6 | 2520 | +aufs defines these operations dynamically. For instance, aufs defines |
7e9cd9fe AM |
2521 | +dummy direct_IO function for struct address_space_operations, but it may |
2522 | +not be set to the address_space_operations actually. When the branch FS | |
2523 | +doesn't have it, aufs doesn't set it to its address_space_operations | |
2524 | +while the function definition itself is still alive. So the behaviour | |
2525 | +itself will not change, and it will return an error when direct_IO is | |
2526 | +not set. | |
53392da6 AM |
2527 | + |
2528 | +The lifetime of these dynamically generated operation object is | |
2529 | +maintained by aufs branch object. When the branch is removed from aufs, | |
2530 | +the reference counter of the object is decremented. When it reaches | |
2531 | +zero, the dynamically generated operation object will be freed. | |
2532 | + | |
7e9cd9fe AM |
2533 | +This approach is designed to support AIO (io_submit), Direct I/O and |
2534 | +XIP (DAX) mainly. | |
2535 | +Currently this approach is applied to address_space_operations for | |
2536 | +regular files only. | |
53392da6 | 2537 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/README linux/Documentation/filesystems/aufs/README |
eca34b5c | 2538 | --- /usr/share/empty/Documentation/filesystems/aufs/README 1970-01-01 01:00:00.000000000 +0100 |
43982f53 AM |
2539 | +++ linux/Documentation/filesystems/aufs/README 2020-01-23 09:59:36.748660743 +0100 |
2540 | @@ -0,0 +1,401 @@ | |
53392da6 | 2541 | + |
fbc438ed | 2542 | +Aufs5 -- advanced multi layered unification filesystem version 5.x |
53392da6 AM |
2543 | +http://aufs.sf.net |
2544 | +Junjiro R. Okajima | |
2545 | + | |
2546 | + | |
2547 | +0. Introduction | |
2548 | +---------------------------------------- | |
2549 | +In the early days, aufs was entirely re-designed and re-implemented | |
7e9cd9fe | 2550 | +Unionfs Version 1.x series. Adding many original ideas, approaches, |
fbc438ed | 2551 | +improvements and implementations, it became totally different from |
53392da6 | 2552 | +Unionfs while keeping the basic features. |
fbc438ed | 2553 | +Later, Unionfs Version 2.x series began taking some of the same |
53392da6 | 2554 | +approaches to aufs1's. |
fbc438ed | 2555 | +Unionfs was being developed by Professor Erez Zadok at Stony Brook |
53392da6 AM |
2556 | +University and his team. |
2557 | + | |
fbc438ed JR |
2558 | +Aufs5 supports linux-v5.0 and later, If you want older kernel version |
2559 | +support, | |
2560 | +- for linux-v4.x series, try aufs4-linux.git or aufs4-standalone.git | |
2561 | +- for linux-v3.x series, try aufs3-linux.git or aufs3-standalone.git | |
2562 | +- for linux-v2.6.16 and later, try aufs2-2.6.git, aufs2-standalone.git | |
2563 | + or aufs1 from CVS on SourceForge. | |
53392da6 AM |
2564 | + |
2565 | +Note: it becomes clear that "Aufs was rejected. Let's give it up." | |
38d290e6 JR |
2566 | + According to Christoph Hellwig, linux rejects all union-type |
2567 | + filesystems but UnionMount. | |
53392da6 AM |
2568 | +<http://marc.info/?l=linux-kernel&m=123938533724484&w=2> |
2569 | + | |
38d290e6 JR |
2570 | +PS. Al Viro seems have a plan to merge aufs as well as overlayfs and |
2571 | + UnionMount, and he pointed out an issue around a directory mutex | |
2572 | + lock and aufs addressed it. But it is still unsure whether aufs will | |
2573 | + be merged (or any other union solution). | |
076b876e | 2574 | +<http://marc.info/?l=linux-kernel&m=136312705029295&w=1> |
38d290e6 | 2575 | + |
53392da6 AM |
2576 | + |
2577 | +1. Features | |
2578 | +---------------------------------------- | |
2579 | +- unite several directories into a single virtual filesystem. The member | |
2580 | + directory is called as a branch. | |
2581 | +- you can specify the permission flags to the branch, which are 'readonly', | |
2582 | + 'readwrite' and 'whiteout-able.' | |
2583 | +- by upper writable branch, internal copyup and whiteout, files/dirs on | |
2584 | + readonly branch are modifiable logically. | |
2585 | +- dynamic branch manipulation, add, del. | |
2586 | +- etc... | |
2587 | + | |
7e9cd9fe AM |
2588 | +Also there are many enhancements in aufs, such as: |
2589 | +- test only the highest one for the directory permission (dirperm1) | |
2590 | +- copyup on open (coo=) | |
2591 | +- 'move' policy for copy-up between two writable branches, after | |
2592 | + checking free space. | |
2593 | +- xattr, acl | |
53392da6 AM |
2594 | +- readdir(3) in userspace. |
2595 | +- keep inode number by external inode number table | |
2596 | +- keep the timestamps of file/dir in internal copyup operation | |
2597 | +- seekable directory, supporting NFS readdir. | |
2598 | +- whiteout is hardlinked in order to reduce the consumption of inodes | |
2599 | + on branch | |
2600 | +- do not copyup, nor create a whiteout when it is unnecessary | |
2601 | +- revert a single systemcall when an error occurs in aufs | |
2602 | +- remount interface instead of ioctl | |
2603 | +- maintain /etc/mtab by an external command, /sbin/mount.aufs. | |
2604 | +- loopback mounted filesystem as a branch | |
2605 | +- kernel thread for removing the dir who has a plenty of whiteouts | |
2606 | +- support copyup sparse file (a file which has a 'hole' in it) | |
2607 | +- default permission flags for branches | |
2608 | +- selectable permission flags for ro branch, whether whiteout can | |
2609 | + exist or not | |
2610 | +- export via NFS. | |
2611 | +- support <sysfs>/fs/aufs and <debugfs>/aufs. | |
2612 | +- support multiple writable branches, some policies to select one | |
2613 | + among multiple writable branches. | |
2614 | +- a new semantics for link(2) and rename(2) to support multiple | |
2615 | + writable branches. | |
2616 | +- no glibc changes are required. | |
2617 | +- pseudo hardlink (hardlink over branches) | |
2618 | +- allow a direct access manually to a file on branch, e.g. bypassing aufs. | |
2619 | + including NFS or remote filesystem branch. | |
2620 | +- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX. | |
2621 | +- and more... | |
2622 | + | |
fbc438ed | 2623 | +Currently these features are dropped temporary from aufs5. |
53392da6 | 2624 | +See design/08plan.txt in detail. |
53392da6 AM |
2625 | +- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs |
2626 | + (robr) | |
2627 | +- statistics of aufs thread (/sys/fs/aufs/stat) | |
53392da6 AM |
2628 | + |
2629 | +Features or just an idea in the future (see also design/*.txt), | |
2630 | +- reorder the branch index without del/re-add. | |
2631 | +- permanent xino files for NFSD | |
2632 | +- an option for refreshing the opened files after add/del branches | |
53392da6 AM |
2633 | +- light version, without branch manipulation. (unnecessary?) |
2634 | +- copyup in userspace | |
2635 | +- inotify in userspace | |
2636 | +- readv/writev | |
53392da6 AM |
2637 | + |
2638 | + | |
2639 | +2. Download | |
2640 | +---------------------------------------- | |
fbc438ed JR |
2641 | +There are three GIT trees for aufs5, aufs5-linux.git, |
2642 | +aufs5-standalone.git, and aufs-util.git. Note that there is no "5" in | |
1e00d052 | 2643 | +"aufs-util.git." |
fbc438ed JR |
2644 | +While the aufs-util is always necessary, you need either of aufs5-linux |
2645 | +or aufs5-standalone. | |
1e00d052 | 2646 | + |
fbc438ed | 2647 | +The aufs5-linux tree includes the whole linux mainline GIT tree, |
1e00d052 AM |
2648 | +git://git.kernel.org/.../torvalds/linux.git. |
2649 | +And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot | |
fbc438ed | 2650 | +build aufs5 as an external kernel module. |
2000de60 | 2651 | +Several extra patches are not included in this tree. Only |
fbc438ed | 2652 | +aufs5-standalone tree contains them. They are described in the later |
2000de60 | 2653 | +section "Configuration and Compilation." |
1e00d052 | 2654 | + |
fbc438ed | 2655 | +On the other hand, the aufs5-standalone tree has only aufs source files |
53392da6 | 2656 | +and necessary patches, and you can select CONFIG_AUFS_FS=m. |
2000de60 | 2657 | +But you need to apply all aufs patches manually. |
53392da6 | 2658 | + |
fbc438ed JR |
2659 | +You will find GIT branches whose name is in form of "aufs5.x" where "x" |
2660 | +represents the linux kernel version, "linux-5.x". For instance, | |
2661 | +"aufs5.0" is for linux-5.0. For latest "linux-5.x-rcN", use | |
2662 | +"aufs5.x-rcN" branch. | |
1e00d052 | 2663 | + |
fbc438ed | 2664 | +o aufs5-linux tree |
1e00d052 | 2665 | +$ git clone --reference /your/linux/git/tree \ |
fbc438ed | 2666 | + git://github.com/sfjro/aufs5-linux.git aufs5-linux.git |
1e00d052 | 2667 | +- if you don't have linux GIT tree, then remove "--reference ..." |
fbc438ed JR |
2668 | +$ cd aufs5-linux.git |
2669 | +$ git checkout origin/aufs5.0 | |
53392da6 | 2670 | + |
2000de60 JR |
2671 | +Or You may want to directly git-pull aufs into your linux GIT tree, and |
2672 | +leave the patch-work to GIT. | |
2673 | +$ cd /your/linux/git/tree | |
fbc438ed JR |
2674 | +$ git remote add aufs5 git://github.com/sfjro/aufs5-linux.git |
2675 | +$ git fetch aufs5 | |
2676 | +$ git checkout -b my5.0 v5.0 | |
5527c038 | 2677 | +$ (add your local change...) |
fbc438ed JR |
2678 | +$ git pull aufs5 aufs5.0 |
2679 | +- now you have v5.0 + your_changes + aufs5.0 in you my5.0 branch. | |
2000de60 | 2680 | +- you may need to solve some conflicts between your_changes and |
fbc438ed JR |
2681 | + aufs5.0. in this case, git-rerere is recommended so that you can |
2682 | + solve the similar conflicts automatically when you upgrade to 5.1 or | |
2000de60 JR |
2683 | + later in the future. |
2684 | + | |
fbc438ed JR |
2685 | +o aufs5-standalone tree |
2686 | +$ git clone git://github.com/sfjro/aufs5-standalone.git aufs5-standalone.git | |
2687 | +$ cd aufs5-standalone.git | |
2688 | +$ git checkout origin/aufs5.0 | |
53392da6 AM |
2689 | + |
2690 | +o aufs-util tree | |
5527c038 JR |
2691 | +$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git |
2692 | +- note that the public aufs-util.git is on SourceForge instead of | |
2693 | + GitHUB. | |
53392da6 | 2694 | +$ cd aufs-util.git |
fbc438ed | 2695 | +$ git checkout origin/aufs5.0 |
53392da6 | 2696 | + |
fbc438ed JR |
2697 | +Note: The 5.x-rcN branch is to be used with `rc' kernel versions ONLY. |
2698 | +The minor version number, 'x' in '5.x', of aufs may not always | |
9dbd164d AM |
2699 | +follow the minor version number of the kernel. |
2700 | +Because changes in the kernel that cause the use of a new | |
2701 | +minor version number do not always require changes to aufs-util. | |
2702 | + | |
2703 | +Since aufs-util has its own minor version number, you may not be | |
2704 | +able to find a GIT branch in aufs-util for your kernel's | |
2705 | +exact minor version number. | |
2706 | +In this case, you should git-checkout the branch for the | |
53392da6 | 2707 | +nearest lower number. |
9dbd164d AM |
2708 | + |
2709 | +For (an unreleased) example: | |
fbc438ed JR |
2710 | +If you are using "linux-5.10" and the "aufs5.10" branch |
2711 | +does not exist in aufs-util repository, then "aufs5.9", "aufs5.8" | |
9dbd164d AM |
2712 | +or something numerically smaller is the branch for your kernel. |
2713 | + | |
53392da6 AM |
2714 | +Also you can view all branches by |
2715 | + $ git branch -a | |
2716 | + | |
2717 | + | |
2718 | +3. Configuration and Compilation | |
2719 | +---------------------------------------- | |
2720 | +Make sure you have git-checkout'ed the correct branch. | |
2721 | + | |
fbc438ed | 2722 | +For aufs5-linux tree, |
c06a8ce3 | 2723 | +- enable CONFIG_AUFS_FS. |
1e00d052 AM |
2724 | +- set other aufs configurations if necessary. |
2725 | + | |
fbc438ed | 2726 | +For aufs5-standalone tree, |
53392da6 AM |
2727 | +There are several ways to build. |
2728 | + | |
2729 | +1. | |
fbc438ed JR |
2730 | +- apply ./aufs5-kbuild.patch to your kernel source files. |
2731 | +- apply ./aufs5-base.patch too. | |
2732 | +- apply ./aufs5-mmap.patch too. | |
2733 | +- apply ./aufs5-standalone.patch too, if you have a plan to set | |
2734 | + CONFIG_AUFS_FS=m. otherwise you don't need ./aufs5-standalone.patch. | |
537831f9 AM |
2735 | +- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your |
2736 | + kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild. | |
c06a8ce3 | 2737 | +- enable CONFIG_AUFS_FS, you can select either |
53392da6 AM |
2738 | + =m or =y. |
2739 | +- and build your kernel as usual. | |
2740 | +- install the built kernel. | |
7eafdf33 AM |
2741 | +- install the header files too by "make headers_install" to the |
2742 | + directory where you specify. By default, it is $PWD/usr. | |
b4510431 | 2743 | + "make help" shows a brief note for headers_install. |
53392da6 AM |
2744 | +- and reboot your system. |
2745 | + | |
2746 | +2. | |
2747 | +- module only (CONFIG_AUFS_FS=m). | |
fbc438ed JR |
2748 | +- apply ./aufs5-base.patch to your kernel source files. |
2749 | +- apply ./aufs5-mmap.patch too. | |
2750 | +- apply ./aufs5-standalone.patch too. | |
53392da6 AM |
2751 | +- build your kernel, don't forget "make headers_install", and reboot. |
2752 | +- edit ./config.mk and set other aufs configurations if necessary. | |
b4510431 | 2753 | + Note: You should read $PWD/fs/aufs/Kconfig carefully which describes |
53392da6 AM |
2754 | + every aufs configurations. |
2755 | +- build the module by simple "make". | |
2756 | +- you can specify ${KDIR} make variable which points to your kernel | |
2757 | + source tree. | |
2758 | +- install the files | |
2759 | + + run "make install" to install the aufs module, or copy the built | |
b4510431 AM |
2760 | + $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply). |
2761 | + + run "make install_headers" (instead of headers_install) to install | |
2762 | + the modified aufs header file (you can specify DESTDIR which is | |
2763 | + available in aufs standalone version's Makefile only), or copy | |
2764 | + $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever | |
2765 | + you like manually. By default, the target directory is $PWD/usr. | |
fbc438ed | 2766 | +- no need to apply aufs5-kbuild.patch, nor copying source files to your |
53392da6 AM |
2767 | + kernel source tree. |
2768 | + | |
b4510431 | 2769 | +Note: The header file aufs_type.h is necessary to build aufs-util |
53392da6 AM |
2770 | + as well as "make headers_install" in the kernel source tree. |
2771 | + headers_install is subject to be forgotten, but it is essentially | |
2772 | + necessary, not only for building aufs-util. | |
2773 | + You may not meet problems without headers_install in some older | |
2774 | + version though. | |
2775 | + | |
2776 | +And then, | |
2777 | +- read README in aufs-util, build and install it | |
9dbd164d AM |
2778 | +- note that your distribution may contain an obsoleted version of |
2779 | + aufs_type.h in /usr/include/linux or something. When you build aufs | |
2780 | + utilities, make sure that your compiler refers the correct aufs header | |
2781 | + file which is built by "make headers_install." | |
53392da6 AM |
2782 | +- if you want to use readdir(3) in userspace or pathconf(3) wrapper, |
2783 | + then run "make install_ulib" too. And refer to the aufs manual in | |
2784 | + detail. | |
2785 | + | |
fbc438ed | 2786 | +There several other patches in aufs5-standalone.git. They are all |
38d290e6 | 2787 | +optional. When you meet some problems, they will help you. |
fbc438ed | 2788 | +- aufs5-loopback.patch |
38d290e6 JR |
2789 | + Supports a nested loopback mount in a branch-fs. This patch is |
2790 | + unnecessary until aufs produces a message like "you may want to try | |
2791 | + another patch for loopback file". | |
83b672a5 AM |
2792 | +- proc_mounts.patch |
2793 | + When there are many mountpoints and many mount(2)/umount(2) are | |
2794 | + running, then /proc/mounts may not show the all mountpoints. This | |
2795 | + patch makes /proc/mounts always show the full mountpoints list. | |
2796 | + If you don't want to apply this patch and meet such problem, then you | |
2797 | + need to increase the value of 'ProcMounts_Times' make-variable in | |
2798 | + aufs-util.git as a second best solution. | |
38d290e6 JR |
2799 | +- vfs-ino.patch |
2800 | + Modifies a system global kernel internal function get_next_ino() in | |
2801 | + order to stop assigning 0 for an inode-number. Not directly related to | |
2802 | + aufs, but recommended generally. | |
2803 | +- tmpfs-idr.patch | |
2804 | + Keeps the tmpfs inode number as the lowest value. Effective to reduce | |
2805 | + the size of aufs XINO files for tmpfs branch. Also it prevents the | |
2806 | + duplication of inode number, which is important for backup tools and | |
2807 | + other utilities. When you find aufs XINO files for tmpfs branch | |
2808 | + growing too much, try this patch. | |
be52b249 AM |
2809 | +- lockdep-debug.patch |
2810 | + Because aufs is not only an ordinary filesystem (callee of VFS), but | |
2811 | + also a caller of VFS functions for branch filesystems, subclassing of | |
2812 | + the internal locks for LOCKDEP is necessary. LOCKDEP is a debugging | |
2813 | + feature of linux kernel. If you enable CONFIG_LOCKDEP, then you will | |
2814 | + need to apply this debug patch to expand several constant values. | |
43982f53 AM |
2815 | + If you don't know what LOCKDEP is, then you don't have apply this |
2816 | + patch. | |
38d290e6 | 2817 | + |
53392da6 AM |
2818 | + |
2819 | +4. Usage | |
2820 | +---------------------------------------- | |
2821 | +At first, make sure aufs-util are installed, and please read the aufs | |
2822 | +manual, aufs.5 in aufs-util.git tree. | |
2823 | +$ man -l aufs.5 | |
2824 | + | |
2825 | +And then, | |
2826 | +$ mkdir /tmp/rw /tmp/aufs | |
2827 | +# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs | |
2828 | + | |
2829 | +Here is another example. The result is equivalent. | |
2830 | +# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs | |
2831 | + Or | |
2832 | +# mount -t aufs -o br:/tmp/rw none /tmp/aufs | |
2833 | +# mount -o remount,append:${HOME} /tmp/aufs | |
2834 | + | |
2835 | +Then, you can see whole tree of your home dir through /tmp/aufs. If | |
2836 | +you modify a file under /tmp/aufs, the one on your home directory is | |
2837 | +not affected, instead the same named file will be newly created under | |
2838 | +/tmp/rw. And all of your modification to a file will be applied to | |
2839 | +the one under /tmp/rw. This is called the file based Copy on Write | |
2840 | +(COW) method. | |
2841 | +Aufs mount options are described in aufs.5. | |
2842 | +If you run chroot or something and make your aufs as a root directory, | |
2843 | +then you need to customize the shutdown script. See the aufs manual in | |
2844 | +detail. | |
2845 | + | |
2846 | +Additionally, there are some sample usages of aufs which are a | |
2847 | +diskless system with network booting, and LiveCD over NFS. | |
2848 | +See sample dir in CVS tree on SourceForge. | |
2849 | + | |
2850 | + | |
2851 | +5. Contact | |
2852 | +---------------------------------------- | |
2853 | +When you have any problems or strange behaviour in aufs, please let me | |
2854 | +know with: | |
2855 | +- /proc/mounts (instead of the output of mount(8)) | |
2856 | +- /sys/module/aufs/* | |
2857 | +- /sys/fs/aufs/* (if you have them) | |
2858 | +- /debug/aufs/* (if you have them) | |
2859 | +- linux kernel version | |
2860 | + if your kernel is not plain, for example modified by distributor, | |
2861 | + the url where i can download its source is necessary too. | |
2862 | +- aufs version which was printed at loading the module or booting the | |
2863 | + system, instead of the date you downloaded. | |
2864 | +- configuration (define/undefine CONFIG_AUFS_xxx) | |
2865 | +- kernel configuration or /proc/config.gz (if you have it) | |
43982f53 | 2866 | +- LSM (linux security module, if you are using) |
53392da6 AM |
2867 | +- behaviour which you think to be incorrect |
2868 | +- actual operation, reproducible one is better | |
2869 | +- mailto: aufs-users at lists.sourceforge.net | |
2870 | + | |
2871 | +Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches, | |
2872 | +and Feature Requests) on SourceForge. Please join and write to | |
2873 | +aufs-users ML. | |
2874 | + | |
2875 | + | |
2876 | +6. Acknowledgements | |
2877 | +---------------------------------------- | |
2878 | +Thanks to everyone who have tried and are using aufs, whoever | |
2879 | +have reported a bug or any feedback. | |
2880 | + | |
2881 | +Especially donators: | |
2882 | +Tomas Matejicek(slax.org) made a donation (much more than once). | |
2883 | + Since Apr 2010, Tomas M (the author of Slax and Linux Live | |
2884 | + scripts) is making "doubling" donations. | |
2885 | + Unfortunately I cannot list all of the donators, but I really | |
b4510431 | 2886 | + appreciate. |
53392da6 AM |
2887 | + It ends Aug 2010, but the ordinary donation URL is still available. |
2888 | + <http://sourceforge.net/donate/index.php?group_id=167503> | |
2889 | +Dai Itasaka made a donation (2007/8). | |
2890 | +Chuck Smith made a donation (2008/4, 10 and 12). | |
2891 | +Henk Schoneveld made a donation (2008/9). | |
2892 | +Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10). | |
2893 | +Francois Dupoux made a donation (2008/11). | |
2894 | +Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public | |
2895 | + aufs2 GIT tree (2009/2). | |
2896 | +William Grant made a donation (2009/3). | |
2897 | +Patrick Lane made a donation (2009/4). | |
2898 | +The Mail Archive (mail-archive.com) made donations (2009/5). | |
2899 | +Nippy Networks (Ed Wildgoose) made a donation (2009/7). | |
2900 | +New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11). | |
2901 | +Pavel Pronskiy made a donation (2011/2). | |
2902 | +Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy | |
2903 | + Networks (Ed Wildgoose) made a donation for hardware (2011/3). | |
537831f9 AM |
2904 | +Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and |
2905 | +11). | |
1e00d052 | 2906 | +Sam Liddicott made a donation (2011/9). |
86dc4139 AM |
2907 | +Era Scarecrow made a donation (2013/4). |
2908 | +Bor Ratajc made a donation (2013/4). | |
2909 | +Alessandro Gorreta made a donation (2013/4). | |
2910 | +POIRETTE Marc made a donation (2013/4). | |
2911 | +Alessandro Gorreta made a donation (2013/4). | |
2912 | +lauri kasvandik made a donation (2013/5). | |
392086de | 2913 | +"pemasu from Finland" made a donation (2013/7). |
523b37e3 AM |
2914 | +The Parted Magic Project made a donation (2013/9 and 11). |
2915 | +Pavel Barta made a donation (2013/10). | |
38d290e6 | 2916 | +Nikolay Pertsev made a donation (2014/5). |
c2c0f25c | 2917 | +James B made a donation (2014/7 and 2015/7). |
076b876e | 2918 | +Stefano Di Biase made a donation (2014/8). |
2000de60 | 2919 | +Daniel Epellei made a donation (2015/1). |
c4adf169 | 2920 | +OmegaPhil made a donation (2016/1, 2018/4). |
5afbbe0d | 2921 | +Tomasz Szewczyk made a donation (2016/4). |
f2c43d5f | 2922 | +James Burry made a donation (2016/12). |
acd2b654 | 2923 | +Carsten Rose made a donation (2018/9). |
9f237c51 | 2924 | +Porteus Kiosk made a donation (2018/10). |
53392da6 AM |
2925 | + |
2926 | +Thank you very much. | |
2927 | +Donations are always, including future donations, very important and | |
2928 | +helpful for me to keep on developing aufs. | |
2929 | + | |
2930 | + | |
2931 | +7. | |
2932 | +---------------------------------------- | |
2933 | +If you are an experienced user, no explanation is needed. Aufs is | |
2934 | +just a linux filesystem. | |
2935 | + | |
2936 | + | |
2937 | +Enjoy! | |
2938 | + | |
2939 | +# Local variables: ; | |
2940 | +# mode: text; | |
2941 | +# End: ; | |
7f207e10 | 2942 | diff -urN /usr/share/empty/fs/aufs/aufs.h linux/fs/aufs/aufs.h |
eca34b5c | 2943 | --- /usr/share/empty/fs/aufs/aufs.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 2944 | +++ linux/fs/aufs/aufs.h 2020-01-27 10:57:18.165538015 +0100 |
acd2b654 | 2945 | @@ -0,0 +1,62 @@ |
062440b3 | 2946 | +/* SPDX-License-Identifier: GPL-2.0 */ |
7f207e10 | 2947 | +/* |
016522bc | 2948 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
7f207e10 AM |
2949 | + * |
2950 | + * This program, aufs is free software; you can redistribute it and/or modify | |
2951 | + * it under the terms of the GNU General Public License as published by | |
2952 | + * the Free Software Foundation; either version 2 of the License, or | |
2953 | + * (at your option) any later version. | |
2954 | + * | |
2955 | + * This program is distributed in the hope that it will be useful, | |
2956 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2957 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2958 | + * GNU General Public License for more details. | |
2959 | + * | |
2960 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 2961 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
2962 | + */ |
2963 | + | |
2964 | +/* | |
2965 | + * all header files | |
2966 | + */ | |
2967 | + | |
2968 | +#ifndef __AUFS_H__ | |
2969 | +#define __AUFS_H__ | |
2970 | + | |
2971 | +#ifdef __KERNEL__ | |
2972 | + | |
2973 | +#define AuStub(type, name, body, ...) \ | |
2974 | + static inline type name(__VA_ARGS__) { body; } | |
2975 | + | |
2976 | +#define AuStubVoid(name, ...) \ | |
2977 | + AuStub(void, name, , __VA_ARGS__) | |
2978 | +#define AuStubInt0(name, ...) \ | |
2979 | + AuStub(int, name, return 0, __VA_ARGS__) | |
2980 | + | |
2981 | +#include "debug.h" | |
2982 | + | |
2983 | +#include "branch.h" | |
2984 | +#include "cpup.h" | |
2985 | +#include "dcsub.h" | |
2986 | +#include "dbgaufs.h" | |
2987 | +#include "dentry.h" | |
2988 | +#include "dir.h" | |
8b6a4947 | 2989 | +#include "dirren.h" |
7f207e10 AM |
2990 | +#include "dynop.h" |
2991 | +#include "file.h" | |
2992 | +#include "fstype.h" | |
8b6a4947 | 2993 | +#include "hbl.h" |
7f207e10 | 2994 | +#include "inode.h" |
acd2b654 | 2995 | +#include "lcnt.h" |
7f207e10 AM |
2996 | +#include "loop.h" |
2997 | +#include "module.h" | |
7f207e10 AM |
2998 | +#include "opts.h" |
2999 | +#include "rwsem.h" | |
7f207e10 AM |
3000 | +#include "super.h" |
3001 | +#include "sysaufs.h" | |
3002 | +#include "vfsub.h" | |
3003 | +#include "whout.h" | |
3004 | +#include "wkq.h" | |
3005 | + | |
3006 | +#endif /* __KERNEL__ */ | |
3007 | +#endif /* __AUFS_H__ */ | |
3008 | diff -urN /usr/share/empty/fs/aufs/branch.c linux/fs/aufs/branch.c | |
eca34b5c | 3009 | --- /usr/share/empty/fs/aufs/branch.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 3010 | +++ linux/fs/aufs/branch.c 2020-01-27 10:57:18.165538015 +0100 |
eca34b5c | 3011 | @@ -0,0 +1,1428 @@ |
cd7a4cd9 | 3012 | +// SPDX-License-Identifier: GPL-2.0 |
7f207e10 | 3013 | +/* |
016522bc | 3014 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
7f207e10 AM |
3015 | + * |
3016 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3017 | + * it under the terms of the GNU General Public License as published by | |
3018 | + * the Free Software Foundation; either version 2 of the License, or | |
3019 | + * (at your option) any later version. | |
3020 | + * | |
3021 | + * This program is distributed in the hope that it will be useful, | |
3022 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3023 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3024 | + * GNU General Public License for more details. | |
3025 | + * | |
3026 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 3027 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
3028 | + */ |
3029 | + | |
3030 | +/* | |
3031 | + * branch management | |
3032 | + */ | |
3033 | + | |
027c5e7a | 3034 | +#include <linux/compat.h> |
7f207e10 AM |
3035 | +#include <linux/statfs.h> |
3036 | +#include "aufs.h" | |
3037 | + | |
3038 | +/* | |
3039 | + * free a single branch | |
1facf9fc | 3040 | + */ |
3041 | +static void au_br_do_free(struct au_branch *br) | |
3042 | +{ | |
3043 | + int i; | |
3044 | + struct au_wbr *wbr; | |
4a4d8108 | 3045 | + struct au_dykey **key; |
1facf9fc | 3046 | + |
027c5e7a | 3047 | + au_hnotify_fin_br(br); |
8b6a4947 AM |
3048 | + /* always, regardless the mount option */ |
3049 | + au_dr_hino_free(&br->br_dirren); | |
062440b3 | 3050 | + au_xino_put(br); |
1facf9fc | 3051 | + |
acd2b654 AM |
3052 | + AuLCntZero(au_lcnt_read(&br->br_nfiles, /*do_rev*/0)); |
3053 | + au_lcnt_fin(&br->br_nfiles, /*do_sync*/0); | |
3054 | + AuLCntZero(au_lcnt_read(&br->br_count, /*do_rev*/0)); | |
3055 | + au_lcnt_fin(&br->br_count, /*do_sync*/0); | |
1facf9fc | 3056 | + |
3057 | + wbr = br->br_wbr; | |
3058 | + if (wbr) { | |
3059 | + for (i = 0; i < AuBrWh_Last; i++) | |
3060 | + dput(wbr->wbr_wh[i]); | |
3061 | + AuDebugOn(atomic_read(&wbr->wbr_wh_running)); | |
dece6358 | 3062 | + AuRwDestroy(&wbr->wbr_wh_rwsem); |
1facf9fc | 3063 | + } |
3064 | + | |
076b876e AM |
3065 | + if (br->br_fhsm) { |
3066 | + au_br_fhsm_fin(br->br_fhsm); | |
9f237c51 | 3067 | + au_kfree_try_rcu(br->br_fhsm); |
076b876e AM |
3068 | + } |
3069 | + | |
4a4d8108 AM |
3070 | + key = br->br_dykey; |
3071 | + for (i = 0; i < AuBrDynOp; i++, key++) | |
3072 | + if (*key) | |
3073 | + au_dy_put(*key); | |
3074 | + else | |
3075 | + break; | |
3076 | + | |
537831f9 | 3077 | + /* recursive lock, s_umount of branch's */ |
acd2b654 | 3078 | + /* synchronize_rcu(); */ /* why? */ |
537831f9 | 3079 | + lockdep_off(); |
86dc4139 | 3080 | + path_put(&br->br_path); |
537831f9 | 3081 | + lockdep_on(); |
9f237c51 | 3082 | + au_kfree_rcu(wbr); |
acd2b654 AM |
3083 | + au_lcnt_wait_for_fin(&br->br_nfiles); |
3084 | + au_lcnt_wait_for_fin(&br->br_count); | |
3085 | + /* I don't know why, but percpu_refcount requires this */ | |
3086 | + /* synchronize_rcu(); */ | |
9f237c51 | 3087 | + au_kfree_rcu(br); |
1facf9fc | 3088 | +} |
3089 | + | |
3090 | +/* | |
3091 | + * frees all branches | |
3092 | + */ | |
3093 | +void au_br_free(struct au_sbinfo *sbinfo) | |
3094 | +{ | |
3095 | + aufs_bindex_t bmax; | |
3096 | + struct au_branch **br; | |
3097 | + | |
dece6358 AM |
3098 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
3099 | + | |
5afbbe0d | 3100 | + bmax = sbinfo->si_bbot + 1; |
1facf9fc | 3101 | + br = sbinfo->si_branch; |
3102 | + while (bmax--) | |
3103 | + au_br_do_free(*br++); | |
3104 | +} | |
3105 | + | |
3106 | +/* | |
3107 | + * find the index of a branch which is specified by @br_id. | |
3108 | + */ | |
3109 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id) | |
3110 | +{ | |
5afbbe0d | 3111 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 3112 | + |
5afbbe0d AM |
3113 | + bbot = au_sbbot(sb); |
3114 | + for (bindex = 0; bindex <= bbot; bindex++) | |
1facf9fc | 3115 | + if (au_sbr_id(sb, bindex) == br_id) |
3116 | + return bindex; | |
3117 | + return -1; | |
3118 | +} | |
3119 | + | |
3120 | +/* ---------------------------------------------------------------------- */ | |
3121 | + | |
3122 | +/* | |
3123 | + * add a branch | |
3124 | + */ | |
3125 | + | |
b752ccd1 AM |
3126 | +static int test_overlap(struct super_block *sb, struct dentry *h_adding, |
3127 | + struct dentry *h_root) | |
1facf9fc | 3128 | +{ |
b752ccd1 AM |
3129 | + if (unlikely(h_adding == h_root |
3130 | + || au_test_loopback_overlap(sb, h_adding))) | |
1facf9fc | 3131 | + return 1; |
b752ccd1 AM |
3132 | + if (h_adding->d_sb != h_root->d_sb) |
3133 | + return 0; | |
3134 | + return au_test_subdir(h_adding, h_root) | |
3135 | + || au_test_subdir(h_root, h_adding); | |
1facf9fc | 3136 | +} |
3137 | + | |
3138 | +/* | |
3139 | + * returns a newly allocated branch. @new_nbranch is a number of branches | |
3140 | + * after adding a branch. | |
3141 | + */ | |
3142 | +static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch, | |
3143 | + int perm) | |
3144 | +{ | |
3145 | + struct au_branch *add_branch; | |
3146 | + struct dentry *root; | |
5527c038 | 3147 | + struct inode *inode; |
4a4d8108 | 3148 | + int err; |
1facf9fc | 3149 | + |
4a4d8108 | 3150 | + err = -ENOMEM; |
be52b249 | 3151 | + add_branch = kzalloc(sizeof(*add_branch), GFP_NOFS); |
1facf9fc | 3152 | + if (unlikely(!add_branch)) |
3153 | + goto out; | |
acd2b654 | 3154 | + add_branch->br_xino = au_xino_alloc(/*nfile*/1); |
062440b3 | 3155 | + if (unlikely(!add_branch->br_xino)) |
521ced18 | 3156 | + goto out_br; |
027c5e7a AM |
3157 | + err = au_hnotify_init_br(add_branch, perm); |
3158 | + if (unlikely(err)) | |
062440b3 | 3159 | + goto out_xino; |
027c5e7a | 3160 | + |
1facf9fc | 3161 | + if (au_br_writable(perm)) { |
3162 | + /* may be freed separately at changing the branch permission */ | |
be52b249 | 3163 | + add_branch->br_wbr = kzalloc(sizeof(*add_branch->br_wbr), |
1facf9fc | 3164 | + GFP_NOFS); |
3165 | + if (unlikely(!add_branch->br_wbr)) | |
027c5e7a | 3166 | + goto out_hnotify; |
1facf9fc | 3167 | + } |
3168 | + | |
076b876e AM |
3169 | + if (au_br_fhsm(perm)) { |
3170 | + err = au_fhsm_br_alloc(add_branch); | |
3171 | + if (unlikely(err)) | |
3172 | + goto out_wbr; | |
3173 | + } | |
3174 | + | |
521ced18 | 3175 | + root = sb->s_root; |
e2f27e51 | 3176 | + err = au_sbr_realloc(au_sbi(sb), new_nbranch, /*may_shrink*/0); |
4a4d8108 | 3177 | + if (!err) |
e2f27e51 | 3178 | + err = au_di_realloc(au_di(root), new_nbranch, /*may_shrink*/0); |
5527c038 JR |
3179 | + if (!err) { |
3180 | + inode = d_inode(root); | |
1c60b727 AM |
3181 | + err = au_hinode_realloc(au_ii(inode), new_nbranch, |
3182 | + /*may_shrink*/0); | |
5527c038 | 3183 | + } |
4a4d8108 AM |
3184 | + if (!err) |
3185 | + return add_branch; /* success */ | |
1facf9fc | 3186 | + |
076b876e | 3187 | +out_wbr: |
9f237c51 | 3188 | + au_kfree_rcu(add_branch->br_wbr); |
027c5e7a AM |
3189 | +out_hnotify: |
3190 | + au_hnotify_fin_br(add_branch); | |
062440b3 AM |
3191 | +out_xino: |
3192 | + au_xino_put(add_branch); | |
4f0767ce | 3193 | +out_br: |
9f237c51 | 3194 | + au_kfree_rcu(add_branch); |
4f0767ce | 3195 | +out: |
4a4d8108 | 3196 | + return ERR_PTR(err); |
1facf9fc | 3197 | +} |
3198 | + | |
3199 | +/* | |
3200 | + * test if the branch permission is legal or not. | |
3201 | + */ | |
3202 | +static int test_br(struct inode *inode, int brperm, char *path) | |
3203 | +{ | |
3204 | + int err; | |
3205 | + | |
4a4d8108 AM |
3206 | + err = (au_br_writable(brperm) && IS_RDONLY(inode)); |
3207 | + if (!err) | |
3208 | + goto out; | |
1facf9fc | 3209 | + |
4a4d8108 AM |
3210 | + err = -EINVAL; |
3211 | + pr_err("write permission for readonly mount or inode, %s\n", path); | |
3212 | + | |
4f0767ce | 3213 | +out: |
1facf9fc | 3214 | + return err; |
3215 | +} | |
3216 | + | |
3217 | +/* | |
3218 | + * returns: | |
3219 | + * 0: success, the caller will add it | |
3220 | + * plus: success, it is already unified, the caller should ignore it | |
3221 | + * minus: error | |
3222 | + */ | |
3223 | +static int test_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
3224 | +{ | |
3225 | + int err; | |
5afbbe0d | 3226 | + aufs_bindex_t bbot, bindex; |
5527c038 | 3227 | + struct dentry *root, *h_dentry; |
1facf9fc | 3228 | + struct inode *inode, *h_inode; |
3229 | + | |
3230 | + root = sb->s_root; | |
5afbbe0d AM |
3231 | + bbot = au_sbbot(sb); |
3232 | + if (unlikely(bbot >= 0 | |
1facf9fc | 3233 | + && au_find_dbindex(root, add->path.dentry) >= 0)) { |
3234 | + err = 1; | |
3235 | + if (!remount) { | |
3236 | + err = -EINVAL; | |
4a4d8108 | 3237 | + pr_err("%s duplicated\n", add->pathname); |
1facf9fc | 3238 | + } |
3239 | + goto out; | |
3240 | + } | |
3241 | + | |
3242 | + err = -ENOSPC; /* -E2BIG; */ | |
3243 | + if (unlikely(AUFS_BRANCH_MAX <= add->bindex | |
5afbbe0d | 3244 | + || AUFS_BRANCH_MAX - 1 <= bbot)) { |
4a4d8108 | 3245 | + pr_err("number of branches exceeded %s\n", add->pathname); |
1facf9fc | 3246 | + goto out; |
3247 | + } | |
3248 | + | |
3249 | + err = -EDOM; | |
5afbbe0d | 3250 | + if (unlikely(add->bindex < 0 || bbot + 1 < add->bindex)) { |
4a4d8108 | 3251 | + pr_err("bad index %d\n", add->bindex); |
1facf9fc | 3252 | + goto out; |
3253 | + } | |
3254 | + | |
5527c038 | 3255 | + inode = d_inode(add->path.dentry); |
1facf9fc | 3256 | + err = -ENOENT; |
3257 | + if (unlikely(!inode->i_nlink)) { | |
4a4d8108 | 3258 | + pr_err("no existence %s\n", add->pathname); |
1facf9fc | 3259 | + goto out; |
3260 | + } | |
3261 | + | |
3262 | + err = -EINVAL; | |
3263 | + if (unlikely(inode->i_sb == sb)) { | |
4a4d8108 | 3264 | + pr_err("%s must be outside\n", add->pathname); |
1facf9fc | 3265 | + goto out; |
3266 | + } | |
3267 | + | |
3268 | + if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) { | |
4a4d8108 AM |
3269 | + pr_err("unsupported filesystem, %s (%s)\n", |
3270 | + add->pathname, au_sbtype(inode->i_sb)); | |
1facf9fc | 3271 | + goto out; |
3272 | + } | |
3273 | + | |
c1595e42 JR |
3274 | + if (unlikely(inode->i_sb->s_stack_depth)) { |
3275 | + pr_err("already stacked, %s (%s)\n", | |
3276 | + add->pathname, au_sbtype(inode->i_sb)); | |
3277 | + goto out; | |
3278 | + } | |
3279 | + | |
5527c038 | 3280 | + err = test_br(d_inode(add->path.dentry), add->perm, add->pathname); |
1facf9fc | 3281 | + if (unlikely(err)) |
3282 | + goto out; | |
3283 | + | |
5afbbe0d | 3284 | + if (bbot < 0) |
1facf9fc | 3285 | + return 0; /* success */ |
3286 | + | |
3287 | + err = -EINVAL; | |
5afbbe0d | 3288 | + for (bindex = 0; bindex <= bbot; bindex++) |
1facf9fc | 3289 | + if (unlikely(test_overlap(sb, add->path.dentry, |
3290 | + au_h_dptr(root, bindex)))) { | |
4a4d8108 | 3291 | + pr_err("%s is overlapped\n", add->pathname); |
1facf9fc | 3292 | + goto out; |
3293 | + } | |
3294 | + | |
3295 | + err = 0; | |
3296 | + if (au_opt_test(au_mntflags(sb), WARN_PERM)) { | |
5527c038 JR |
3297 | + h_dentry = au_h_dptr(root, 0); |
3298 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 3299 | + if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO) |
0c3ec466 AM |
3300 | + || !uid_eq(h_inode->i_uid, inode->i_uid) |
3301 | + || !gid_eq(h_inode->i_gid, inode->i_gid)) | |
3302 | + pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n", | |
3303 | + add->pathname, | |
3304 | + i_uid_read(inode), i_gid_read(inode), | |
3305 | + (inode->i_mode & S_IALLUGO), | |
3306 | + i_uid_read(h_inode), i_gid_read(h_inode), | |
3307 | + (h_inode->i_mode & S_IALLUGO)); | |
1facf9fc | 3308 | + } |
3309 | + | |
4f0767ce | 3310 | +out: |
1facf9fc | 3311 | + return err; |
3312 | +} | |
3313 | + | |
3314 | +/* | |
3315 | + * initialize or clean the whiteouts for an adding branch | |
3316 | + */ | |
3317 | +static int au_br_init_wh(struct super_block *sb, struct au_branch *br, | |
86dc4139 | 3318 | + int new_perm) |
1facf9fc | 3319 | +{ |
3320 | + int err, old_perm; | |
3321 | + aufs_bindex_t bindex; | |
febd17d6 | 3322 | + struct inode *h_inode; |
1facf9fc | 3323 | + struct au_wbr *wbr; |
3324 | + struct au_hinode *hdir; | |
5527c038 | 3325 | + struct dentry *h_dentry; |
1facf9fc | 3326 | + |
86dc4139 AM |
3327 | + err = vfsub_mnt_want_write(au_br_mnt(br)); |
3328 | + if (unlikely(err)) | |
3329 | + goto out; | |
3330 | + | |
1facf9fc | 3331 | + wbr = br->br_wbr; |
3332 | + old_perm = br->br_perm; | |
3333 | + br->br_perm = new_perm; | |
3334 | + hdir = NULL; | |
febd17d6 | 3335 | + h_inode = NULL; |
1facf9fc | 3336 | + bindex = au_br_index(sb, br->br_id); |
3337 | + if (0 <= bindex) { | |
5527c038 | 3338 | + hdir = au_hi(d_inode(sb->s_root), bindex); |
5afbbe0d | 3339 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 3340 | + } else { |
5527c038 | 3341 | + h_dentry = au_br_dentry(br); |
febd17d6 JR |
3342 | + h_inode = d_inode(h_dentry); |
3343 | + inode_lock_nested(h_inode, AuLsc_I_PARENT); | |
1facf9fc | 3344 | + } |
3345 | + if (!wbr) | |
86dc4139 | 3346 | + err = au_wh_init(br, sb); |
1facf9fc | 3347 | + else { |
3348 | + wbr_wh_write_lock(wbr); | |
86dc4139 | 3349 | + err = au_wh_init(br, sb); |
1facf9fc | 3350 | + wbr_wh_write_unlock(wbr); |
3351 | + } | |
3352 | + if (hdir) | |
5afbbe0d | 3353 | + au_hn_inode_unlock(hdir); |
1facf9fc | 3354 | + else |
febd17d6 | 3355 | + inode_unlock(h_inode); |
86dc4139 | 3356 | + vfsub_mnt_drop_write(au_br_mnt(br)); |
1facf9fc | 3357 | + br->br_perm = old_perm; |
3358 | + | |
3359 | + if (!err && wbr && !au_br_writable(new_perm)) { | |
9f237c51 | 3360 | + au_kfree_rcu(wbr); |
1facf9fc | 3361 | + br->br_wbr = NULL; |
3362 | + } | |
3363 | + | |
86dc4139 | 3364 | +out: |
1facf9fc | 3365 | + return err; |
3366 | +} | |
3367 | + | |
3368 | +static int au_wbr_init(struct au_branch *br, struct super_block *sb, | |
86dc4139 | 3369 | + int perm) |
1facf9fc | 3370 | +{ |
3371 | + int err; | |
4a4d8108 | 3372 | + struct kstatfs kst; |
1facf9fc | 3373 | + struct au_wbr *wbr; |
3374 | + | |
3375 | + wbr = br->br_wbr; | |
dece6358 | 3376 | + au_rw_init(&wbr->wbr_wh_rwsem); |
1facf9fc | 3377 | + atomic_set(&wbr->wbr_wh_running, 0); |
1facf9fc | 3378 | + |
4a4d8108 AM |
3379 | + /* |
3380 | + * a limit for rmdir/rename a dir | |
523b37e3 | 3381 | + * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h |
4a4d8108 | 3382 | + */ |
86dc4139 | 3383 | + err = vfs_statfs(&br->br_path, &kst); |
4a4d8108 AM |
3384 | + if (unlikely(err)) |
3385 | + goto out; | |
3386 | + err = -EINVAL; | |
3387 | + if (kst.f_namelen >= NAME_MAX) | |
86dc4139 | 3388 | + err = au_br_init_wh(sb, br, perm); |
4a4d8108 | 3389 | + else |
523b37e3 AM |
3390 | + pr_err("%pd(%s), unsupported namelen %ld\n", |
3391 | + au_br_dentry(br), | |
86dc4139 | 3392 | + au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen); |
1facf9fc | 3393 | + |
4f0767ce | 3394 | +out: |
1facf9fc | 3395 | + return err; |
3396 | +} | |
3397 | + | |
c1595e42 | 3398 | +/* initialize a new branch */ |
1facf9fc | 3399 | +static int au_br_init(struct au_branch *br, struct super_block *sb, |
3400 | + struct au_opt_add *add) | |
3401 | +{ | |
3402 | + int err; | |
062440b3 AM |
3403 | + struct au_branch *brbase; |
3404 | + struct file *xf; | |
5527c038 | 3405 | + struct inode *h_inode; |
1facf9fc | 3406 | + |
3407 | + err = 0; | |
1facf9fc | 3408 | + br->br_perm = add->perm; |
86dc4139 | 3409 | + br->br_path = add->path; /* set first, path_get() later */ |
4a4d8108 | 3410 | + spin_lock_init(&br->br_dykey_lock); |
acd2b654 AM |
3411 | + au_lcnt_init(&br->br_nfiles, /*release*/NULL); |
3412 | + au_lcnt_init(&br->br_count, /*release*/NULL); | |
1facf9fc | 3413 | + br->br_id = au_new_br_id(sb); |
7f207e10 | 3414 | + AuDebugOn(br->br_id < 0); |
1facf9fc | 3415 | + |
8b6a4947 AM |
3416 | + /* always, regardless the given option */ |
3417 | + err = au_dr_br_init(sb, br, &add->path); | |
3418 | + if (unlikely(err)) | |
3419 | + goto out_err; | |
3420 | + | |
1facf9fc | 3421 | + if (au_br_writable(add->perm)) { |
86dc4139 | 3422 | + err = au_wbr_init(br, sb, add->perm); |
1facf9fc | 3423 | + if (unlikely(err)) |
b752ccd1 | 3424 | + goto out_err; |
1facf9fc | 3425 | + } |
3426 | + | |
3427 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
062440b3 | 3428 | + brbase = au_sbr(sb, 0); |
acd2b654 | 3429 | + xf = au_xino_file(brbase->br_xino, /*idx*/-1); |
062440b3 | 3430 | + AuDebugOn(!xf); |
5527c038 | 3431 | + h_inode = d_inode(add->path.dentry); |
062440b3 | 3432 | + err = au_xino_init_br(sb, br, h_inode->i_ino, &xf->f_path); |
1facf9fc | 3433 | + if (unlikely(err)) { |
acd2b654 | 3434 | + AuDebugOn(au_xino_file(br->br_xino, /*idx*/-1)); |
b752ccd1 | 3435 | + goto out_err; |
1facf9fc | 3436 | + } |
3437 | + } | |
3438 | + | |
3439 | + sysaufs_br_init(br); | |
86dc4139 | 3440 | + path_get(&br->br_path); |
b752ccd1 | 3441 | + goto out; /* success */ |
1facf9fc | 3442 | + |
4f0767ce | 3443 | +out_err: |
86dc4139 | 3444 | + memset(&br->br_path, 0, sizeof(br->br_path)); |
4f0767ce | 3445 | +out: |
1facf9fc | 3446 | + return err; |
3447 | +} | |
3448 | + | |
3449 | +static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3450 | + struct au_branch *br, aufs_bindex_t bbot, |
1facf9fc | 3451 | + aufs_bindex_t amount) |
3452 | +{ | |
3453 | + struct au_branch **brp; | |
3454 | + | |
dece6358 AM |
3455 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
3456 | + | |
1facf9fc | 3457 | + brp = sbinfo->si_branch + bindex; |
3458 | + memmove(brp + 1, brp, sizeof(*brp) * amount); | |
3459 | + *brp = br; | |
5afbbe0d AM |
3460 | + sbinfo->si_bbot++; |
3461 | + if (unlikely(bbot < 0)) | |
3462 | + sbinfo->si_bbot = 0; | |
1facf9fc | 3463 | +} |
3464 | + | |
3465 | +static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3466 | + aufs_bindex_t bbot, aufs_bindex_t amount) |
1facf9fc | 3467 | +{ |
3468 | + struct au_hdentry *hdp; | |
3469 | + | |
1308ab2a | 3470 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
3471 | + | |
5afbbe0d | 3472 | + hdp = au_hdentry(dinfo, bindex); |
1facf9fc | 3473 | + memmove(hdp + 1, hdp, sizeof(*hdp) * amount); |
3474 | + au_h_dentry_init(hdp); | |
5afbbe0d AM |
3475 | + dinfo->di_bbot++; |
3476 | + if (unlikely(bbot < 0)) | |
3477 | + dinfo->di_btop = 0; | |
1facf9fc | 3478 | +} |
3479 | + | |
3480 | +static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3481 | + aufs_bindex_t bbot, aufs_bindex_t amount) |
1facf9fc | 3482 | +{ |
3483 | + struct au_hinode *hip; | |
3484 | + | |
1308ab2a | 3485 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
3486 | + | |
5afbbe0d | 3487 | + hip = au_hinode(iinfo, bindex); |
1facf9fc | 3488 | + memmove(hip + 1, hip, sizeof(*hip) * amount); |
5afbbe0d AM |
3489 | + au_hinode_init(hip); |
3490 | + iinfo->ii_bbot++; | |
3491 | + if (unlikely(bbot < 0)) | |
3492 | + iinfo->ii_btop = 0; | |
1facf9fc | 3493 | +} |
3494 | + | |
86dc4139 AM |
3495 | +static void au_br_do_add(struct super_block *sb, struct au_branch *br, |
3496 | + aufs_bindex_t bindex) | |
1facf9fc | 3497 | +{ |
86dc4139 | 3498 | + struct dentry *root, *h_dentry; |
5527c038 | 3499 | + struct inode *root_inode, *h_inode; |
5afbbe0d | 3500 | + aufs_bindex_t bbot, amount; |
1facf9fc | 3501 | + |
3502 | + root = sb->s_root; | |
5527c038 | 3503 | + root_inode = d_inode(root); |
5afbbe0d AM |
3504 | + bbot = au_sbbot(sb); |
3505 | + amount = bbot + 1 - bindex; | |
86dc4139 | 3506 | + h_dentry = au_br_dentry(br); |
53392da6 | 3507 | + au_sbilist_lock(); |
5afbbe0d AM |
3508 | + au_br_do_add_brp(au_sbi(sb), bindex, br, bbot, amount); |
3509 | + au_br_do_add_hdp(au_di(root), bindex, bbot, amount); | |
3510 | + au_br_do_add_hip(au_ii(root_inode), bindex, bbot, amount); | |
1facf9fc | 3511 | + au_set_h_dptr(root, bindex, dget(h_dentry)); |
5527c038 JR |
3512 | + h_inode = d_inode(h_dentry); |
3513 | + au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0); | |
53392da6 | 3514 | + au_sbilist_unlock(); |
1facf9fc | 3515 | +} |
3516 | + | |
3517 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
3518 | +{ | |
3519 | + int err; | |
5afbbe0d | 3520 | + aufs_bindex_t bbot, add_bindex; |
1facf9fc | 3521 | + struct dentry *root, *h_dentry; |
3522 | + struct inode *root_inode; | |
3523 | + struct au_branch *add_branch; | |
3524 | + | |
3525 | + root = sb->s_root; | |
5527c038 | 3526 | + root_inode = d_inode(root); |
1facf9fc | 3527 | + IMustLock(root_inode); |
5afbbe0d | 3528 | + IiMustWriteLock(root_inode); |
1facf9fc | 3529 | + err = test_add(sb, add, remount); |
3530 | + if (unlikely(err < 0)) | |
3531 | + goto out; | |
3532 | + if (err) { | |
3533 | + err = 0; | |
3534 | + goto out; /* success */ | |
3535 | + } | |
3536 | + | |
5afbbe0d AM |
3537 | + bbot = au_sbbot(sb); |
3538 | + add_branch = au_br_alloc(sb, bbot + 2, add->perm); | |
1facf9fc | 3539 | + err = PTR_ERR(add_branch); |
3540 | + if (IS_ERR(add_branch)) | |
3541 | + goto out; | |
3542 | + | |
3543 | + err = au_br_init(add_branch, sb, add); | |
3544 | + if (unlikely(err)) { | |
3545 | + au_br_do_free(add_branch); | |
3546 | + goto out; | |
3547 | + } | |
3548 | + | |
3549 | + add_bindex = add->bindex; | |
062440b3 AM |
3550 | + sysaufs_brs_del(sb, add_bindex); /* remove successors */ |
3551 | + au_br_do_add(sb, add_branch, add_bindex); | |
3552 | + sysaufs_brs_add(sb, add_bindex); /* append successors */ | |
3553 | + dbgaufs_brs_add(sb, add_bindex, /*topdown*/0); /* rename successors */ | |
1facf9fc | 3554 | + |
86dc4139 | 3555 | + h_dentry = add->path.dentry; |
1308ab2a | 3556 | + if (!add_bindex) { |
1facf9fc | 3557 | + au_cpup_attr_all(root_inode, /*force*/1); |
1308ab2a | 3558 | + sb->s_maxbytes = h_dentry->d_sb->s_maxbytes; |
3559 | + } else | |
5527c038 | 3560 | + au_add_nlink(root_inode, d_inode(h_dentry)); |
1facf9fc | 3561 | + |
4f0767ce | 3562 | +out: |
1facf9fc | 3563 | + return err; |
3564 | +} | |
3565 | + | |
3566 | +/* ---------------------------------------------------------------------- */ | |
3567 | + | |
79b8bda9 | 3568 | +static unsigned long long au_farray_cb(struct super_block *sb, void *a, |
076b876e AM |
3569 | + unsigned long long max __maybe_unused, |
3570 | + void *arg) | |
3571 | +{ | |
3572 | + unsigned long long n; | |
3573 | + struct file **p, *f; | |
8b6a4947 AM |
3574 | + struct hlist_bl_head *files; |
3575 | + struct hlist_bl_node *pos; | |
076b876e | 3576 | + struct au_finfo *finfo; |
076b876e AM |
3577 | + |
3578 | + n = 0; | |
3579 | + p = a; | |
3580 | + files = &au_sbi(sb)->si_files; | |
8b6a4947 AM |
3581 | + hlist_bl_lock(files); |
3582 | + hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { | |
076b876e AM |
3583 | + f = finfo->fi_file; |
3584 | + if (file_count(f) | |
3585 | + && !special_file(file_inode(f)->i_mode)) { | |
3586 | + get_file(f); | |
3587 | + *p++ = f; | |
3588 | + n++; | |
3589 | + AuDebugOn(n > max); | |
3590 | + } | |
3591 | + } | |
8b6a4947 | 3592 | + hlist_bl_unlock(files); |
076b876e AM |
3593 | + |
3594 | + return n; | |
3595 | +} | |
3596 | + | |
3597 | +static struct file **au_farray_alloc(struct super_block *sb, | |
3598 | + unsigned long long *max) | |
3599 | +{ | |
acd2b654 AM |
3600 | + struct au_sbinfo *sbi; |
3601 | + | |
3602 | + sbi = au_sbi(sb); | |
3603 | + *max = au_lcnt_read(&sbi->si_nfiles, /*do_rev*/1); | |
79b8bda9 | 3604 | + return au_array_alloc(max, au_farray_cb, sb, /*arg*/NULL); |
076b876e AM |
3605 | +} |
3606 | + | |
3607 | +static void au_farray_free(struct file **a, unsigned long long max) | |
3608 | +{ | |
3609 | + unsigned long long ull; | |
3610 | + | |
3611 | + for (ull = 0; ull < max; ull++) | |
3612 | + if (a[ull]) | |
3613 | + fput(a[ull]); | |
be52b249 | 3614 | + kvfree(a); |
076b876e AM |
3615 | +} |
3616 | + | |
3617 | +/* ---------------------------------------------------------------------- */ | |
3618 | + | |
1facf9fc | 3619 | +/* |
3620 | + * delete a branch | |
3621 | + */ | |
3622 | + | |
3623 | +/* to show the line number, do not make it inlined function */ | |
4a4d8108 | 3624 | +#define AuVerbose(do_info, fmt, ...) do { \ |
1facf9fc | 3625 | + if (do_info) \ |
4a4d8108 | 3626 | + pr_info(fmt, ##__VA_ARGS__); \ |
1facf9fc | 3627 | +} while (0) |
3628 | + | |
5afbbe0d AM |
3629 | +static int au_test_ibusy(struct inode *inode, aufs_bindex_t btop, |
3630 | + aufs_bindex_t bbot) | |
027c5e7a | 3631 | +{ |
5afbbe0d | 3632 | + return (inode && !S_ISDIR(inode->i_mode)) || btop == bbot; |
027c5e7a AM |
3633 | +} |
3634 | + | |
5afbbe0d AM |
3635 | +static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t btop, |
3636 | + aufs_bindex_t bbot) | |
027c5e7a | 3637 | +{ |
5afbbe0d | 3638 | + return au_test_ibusy(d_inode(dentry), btop, bbot); |
027c5e7a AM |
3639 | +} |
3640 | + | |
1facf9fc | 3641 | +/* |
3642 | + * test if the branch is deletable or not. | |
3643 | + */ | |
3644 | +static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex, | |
b752ccd1 | 3645 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 3646 | +{ |
3647 | + int err, i, j, ndentry; | |
5afbbe0d | 3648 | + aufs_bindex_t btop, bbot; |
1facf9fc | 3649 | + struct au_dcsub_pages dpages; |
3650 | + struct au_dpage *dpage; | |
3651 | + struct dentry *d; | |
1facf9fc | 3652 | + |
3653 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
3654 | + if (unlikely(err)) | |
3655 | + goto out; | |
3656 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); | |
3657 | + if (unlikely(err)) | |
3658 | + goto out_dpages; | |
3659 | + | |
1facf9fc | 3660 | + for (i = 0; !err && i < dpages.ndpage; i++) { |
3661 | + dpage = dpages.dpages + i; | |
3662 | + ndentry = dpage->ndentry; | |
3663 | + for (j = 0; !err && j < ndentry; j++) { | |
3664 | + d = dpage->dentries[j]; | |
c1595e42 | 3665 | + AuDebugOn(au_dcount(d) <= 0); |
027c5e7a | 3666 | + if (!au_digen_test(d, sigen)) { |
1facf9fc | 3667 | + di_read_lock_child(d, AuLock_IR); |
027c5e7a AM |
3668 | + if (unlikely(au_dbrange_test(d))) { |
3669 | + di_read_unlock(d, AuLock_IR); | |
3670 | + continue; | |
3671 | + } | |
3672 | + } else { | |
1facf9fc | 3673 | + di_write_lock_child(d); |
027c5e7a AM |
3674 | + if (unlikely(au_dbrange_test(d))) { |
3675 | + di_write_unlock(d); | |
3676 | + continue; | |
3677 | + } | |
1facf9fc | 3678 | + err = au_reval_dpath(d, sigen); |
3679 | + if (!err) | |
3680 | + di_downgrade_lock(d, AuLock_IR); | |
3681 | + else { | |
3682 | + di_write_unlock(d); | |
3683 | + break; | |
3684 | + } | |
3685 | + } | |
3686 | + | |
027c5e7a | 3687 | + /* AuDbgDentry(d); */ |
5afbbe0d AM |
3688 | + btop = au_dbtop(d); |
3689 | + bbot = au_dbbot(d); | |
3690 | + if (btop <= bindex | |
3691 | + && bindex <= bbot | |
1facf9fc | 3692 | + && au_h_dptr(d, bindex) |
5afbbe0d | 3693 | + && au_test_dbusy(d, btop, bbot)) { |
1facf9fc | 3694 | + err = -EBUSY; |
523b37e3 | 3695 | + AuVerbose(verbose, "busy %pd\n", d); |
027c5e7a | 3696 | + AuDbgDentry(d); |
1facf9fc | 3697 | + } |
3698 | + di_read_unlock(d, AuLock_IR); | |
3699 | + } | |
3700 | + } | |
3701 | + | |
4f0767ce | 3702 | +out_dpages: |
1facf9fc | 3703 | + au_dpages_free(&dpages); |
4f0767ce | 3704 | +out: |
1facf9fc | 3705 | + return err; |
3706 | +} | |
3707 | + | |
3708 | +static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, | |
b752ccd1 | 3709 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 3710 | +{ |
3711 | + int err; | |
7f207e10 AM |
3712 | + unsigned long long max, ull; |
3713 | + struct inode *i, **array; | |
5afbbe0d | 3714 | + aufs_bindex_t btop, bbot; |
1facf9fc | 3715 | + |
7f207e10 AM |
3716 | + array = au_iarray_alloc(sb, &max); |
3717 | + err = PTR_ERR(array); | |
3718 | + if (IS_ERR(array)) | |
3719 | + goto out; | |
3720 | + | |
1facf9fc | 3721 | + err = 0; |
7f207e10 AM |
3722 | + AuDbg("b%d\n", bindex); |
3723 | + for (ull = 0; !err && ull < max; ull++) { | |
3724 | + i = array[ull]; | |
076b876e AM |
3725 | + if (unlikely(!i)) |
3726 | + break; | |
7f207e10 | 3727 | + if (i->i_ino == AUFS_ROOT_INO) |
1facf9fc | 3728 | + continue; |
3729 | + | |
7f207e10 | 3730 | + /* AuDbgInode(i); */ |
537831f9 | 3731 | + if (au_iigen(i, NULL) == sigen) |
1facf9fc | 3732 | + ii_read_lock_child(i); |
3733 | + else { | |
3734 | + ii_write_lock_child(i); | |
027c5e7a AM |
3735 | + err = au_refresh_hinode_self(i); |
3736 | + au_iigen_dec(i); | |
1facf9fc | 3737 | + if (!err) |
3738 | + ii_downgrade_lock(i); | |
3739 | + else { | |
3740 | + ii_write_unlock(i); | |
3741 | + break; | |
3742 | + } | |
3743 | + } | |
3744 | + | |
5afbbe0d AM |
3745 | + btop = au_ibtop(i); |
3746 | + bbot = au_ibbot(i); | |
3747 | + if (btop <= bindex | |
3748 | + && bindex <= bbot | |
1facf9fc | 3749 | + && au_h_iptr(i, bindex) |
5afbbe0d | 3750 | + && au_test_ibusy(i, btop, bbot)) { |
1facf9fc | 3751 | + err = -EBUSY; |
3752 | + AuVerbose(verbose, "busy i%lu\n", i->i_ino); | |
7f207e10 | 3753 | + AuDbgInode(i); |
1facf9fc | 3754 | + } |
3755 | + ii_read_unlock(i); | |
3756 | + } | |
7f207e10 | 3757 | + au_iarray_free(array, max); |
1facf9fc | 3758 | + |
7f207e10 | 3759 | +out: |
1facf9fc | 3760 | + return err; |
3761 | +} | |
3762 | + | |
b752ccd1 AM |
3763 | +static int test_children_busy(struct dentry *root, aufs_bindex_t bindex, |
3764 | + const unsigned int verbose) | |
1facf9fc | 3765 | +{ |
3766 | + int err; | |
3767 | + unsigned int sigen; | |
3768 | + | |
3769 | + sigen = au_sigen(root->d_sb); | |
3770 | + DiMustNoWaiters(root); | |
5527c038 | 3771 | + IiMustNoWaiters(d_inode(root)); |
1facf9fc | 3772 | + di_write_unlock(root); |
b752ccd1 | 3773 | + err = test_dentry_busy(root, bindex, sigen, verbose); |
1facf9fc | 3774 | + if (!err) |
b752ccd1 | 3775 | + err = test_inode_busy(root->d_sb, bindex, sigen, verbose); |
1facf9fc | 3776 | + di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */ |
3777 | + | |
3778 | + return err; | |
3779 | +} | |
3780 | + | |
076b876e AM |
3781 | +static int test_dir_busy(struct file *file, aufs_bindex_t br_id, |
3782 | + struct file **to_free, int *idx) | |
3783 | +{ | |
3784 | + int err; | |
c1595e42 | 3785 | + unsigned char matched, root; |
5afbbe0d | 3786 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
3787 | + struct au_fidir *fidir; |
3788 | + struct au_hfile *hfile; | |
3789 | + | |
3790 | + err = 0; | |
2000de60 | 3791 | + root = IS_ROOT(file->f_path.dentry); |
c1595e42 JR |
3792 | + if (root) { |
3793 | + get_file(file); | |
3794 | + to_free[*idx] = file; | |
3795 | + (*idx)++; | |
3796 | + goto out; | |
3797 | + } | |
3798 | + | |
076b876e | 3799 | + matched = 0; |
076b876e AM |
3800 | + fidir = au_fi(file)->fi_hdir; |
3801 | + AuDebugOn(!fidir); | |
5afbbe0d AM |
3802 | + bbot = au_fbbot_dir(file); |
3803 | + for (bindex = au_fbtop(file); bindex <= bbot; bindex++) { | |
076b876e AM |
3804 | + hfile = fidir->fd_hfile + bindex; |
3805 | + if (!hfile->hf_file) | |
3806 | + continue; | |
3807 | + | |
c1595e42 | 3808 | + if (hfile->hf_br->br_id == br_id) { |
076b876e | 3809 | + matched = 1; |
076b876e | 3810 | + break; |
c1595e42 | 3811 | + } |
076b876e | 3812 | + } |
c1595e42 | 3813 | + if (matched) |
076b876e AM |
3814 | + err = -EBUSY; |
3815 | + | |
3816 | +out: | |
3817 | + return err; | |
3818 | +} | |
3819 | + | |
3820 | +static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id, | |
3821 | + struct file **to_free, int opened) | |
3822 | +{ | |
3823 | + int err, idx; | |
3824 | + unsigned long long ull, max; | |
5afbbe0d | 3825 | + aufs_bindex_t btop; |
076b876e | 3826 | + struct file *file, **array; |
076b876e AM |
3827 | + struct dentry *root; |
3828 | + struct au_hfile *hfile; | |
3829 | + | |
3830 | + array = au_farray_alloc(sb, &max); | |
3831 | + err = PTR_ERR(array); | |
3832 | + if (IS_ERR(array)) | |
3833 | + goto out; | |
3834 | + | |
3835 | + err = 0; | |
3836 | + idx = 0; | |
3837 | + root = sb->s_root; | |
3838 | + di_write_unlock(root); | |
3839 | + for (ull = 0; ull < max; ull++) { | |
3840 | + file = array[ull]; | |
3841 | + if (unlikely(!file)) | |
3842 | + break; | |
3843 | + | |
3844 | + /* AuDbg("%pD\n", file); */ | |
3845 | + fi_read_lock(file); | |
5afbbe0d | 3846 | + btop = au_fbtop(file); |
2000de60 | 3847 | + if (!d_is_dir(file->f_path.dentry)) { |
076b876e AM |
3848 | + hfile = &au_fi(file)->fi_htop; |
3849 | + if (hfile->hf_br->br_id == br_id) | |
3850 | + err = -EBUSY; | |
3851 | + } else | |
3852 | + err = test_dir_busy(file, br_id, to_free, &idx); | |
3853 | + fi_read_unlock(file); | |
3854 | + if (unlikely(err)) | |
3855 | + break; | |
3856 | + } | |
3857 | + di_write_lock_child(root); | |
3858 | + au_farray_free(array, max); | |
3859 | + AuDebugOn(idx > opened); | |
3860 | + | |
3861 | +out: | |
3862 | + return err; | |
3863 | +} | |
3864 | + | |
3865 | +static void br_del_file(struct file **to_free, unsigned long long opened, | |
062440b3 | 3866 | + aufs_bindex_t br_id) |
076b876e AM |
3867 | +{ |
3868 | + unsigned long long ull; | |
5afbbe0d | 3869 | + aufs_bindex_t bindex, btop, bbot, bfound; |
076b876e AM |
3870 | + struct file *file; |
3871 | + struct au_fidir *fidir; | |
3872 | + struct au_hfile *hfile; | |
3873 | + | |
3874 | + for (ull = 0; ull < opened; ull++) { | |
3875 | + file = to_free[ull]; | |
3876 | + if (unlikely(!file)) | |
3877 | + break; | |
3878 | + | |
3879 | + /* AuDbg("%pD\n", file); */ | |
2000de60 | 3880 | + AuDebugOn(!d_is_dir(file->f_path.dentry)); |
076b876e AM |
3881 | + bfound = -1; |
3882 | + fidir = au_fi(file)->fi_hdir; | |
3883 | + AuDebugOn(!fidir); | |
3884 | + fi_write_lock(file); | |
5afbbe0d AM |
3885 | + btop = au_fbtop(file); |
3886 | + bbot = au_fbbot_dir(file); | |
3887 | + for (bindex = btop; bindex <= bbot; bindex++) { | |
076b876e AM |
3888 | + hfile = fidir->fd_hfile + bindex; |
3889 | + if (!hfile->hf_file) | |
3890 | + continue; | |
3891 | + | |
3892 | + if (hfile->hf_br->br_id == br_id) { | |
3893 | + bfound = bindex; | |
3894 | + break; | |
3895 | + } | |
3896 | + } | |
3897 | + AuDebugOn(bfound < 0); | |
3898 | + au_set_h_fptr(file, bfound, NULL); | |
5afbbe0d AM |
3899 | + if (bfound == btop) { |
3900 | + for (btop++; btop <= bbot; btop++) | |
3901 | + if (au_hf_dir(file, btop)) { | |
3902 | + au_set_fbtop(file, btop); | |
076b876e AM |
3903 | + break; |
3904 | + } | |
3905 | + } | |
3906 | + fi_write_unlock(file); | |
3907 | + } | |
3908 | +} | |
3909 | + | |
1facf9fc | 3910 | +static void au_br_do_del_brp(struct au_sbinfo *sbinfo, |
3911 | + const aufs_bindex_t bindex, | |
5afbbe0d | 3912 | + const aufs_bindex_t bbot) |
1facf9fc | 3913 | +{ |
3914 | + struct au_branch **brp, **p; | |
3915 | + | |
dece6358 AM |
3916 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
3917 | + | |
1facf9fc | 3918 | + brp = sbinfo->si_branch + bindex; |
5afbbe0d AM |
3919 | + if (bindex < bbot) |
3920 | + memmove(brp, brp + 1, sizeof(*brp) * (bbot - bindex)); | |
3921 | + sbinfo->si_branch[0 + bbot] = NULL; | |
3922 | + sbinfo->si_bbot--; | |
1facf9fc | 3923 | + |
e2f27e51 AM |
3924 | + p = au_krealloc(sbinfo->si_branch, sizeof(*p) * bbot, AuGFP_SBILIST, |
3925 | + /*may_shrink*/1); | |
1facf9fc | 3926 | + if (p) |
3927 | + sbinfo->si_branch = p; | |
4a4d8108 | 3928 | + /* harmless error */ |
1facf9fc | 3929 | +} |
3930 | + | |
3931 | +static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex, | |
5afbbe0d | 3932 | + const aufs_bindex_t bbot) |
1facf9fc | 3933 | +{ |
3934 | + struct au_hdentry *hdp, *p; | |
3935 | + | |
1308ab2a | 3936 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
3937 | + | |
5afbbe0d AM |
3938 | + hdp = au_hdentry(dinfo, bindex); |
3939 | + if (bindex < bbot) | |
3940 | + memmove(hdp, hdp + 1, sizeof(*hdp) * (bbot - bindex)); | |
3941 | + /* au_h_dentry_init(au_hdentry(dinfo, bbot); */ | |
3942 | + dinfo->di_bbot--; | |
1facf9fc | 3943 | + |
e2f27e51 AM |
3944 | + p = au_krealloc(dinfo->di_hdentry, sizeof(*p) * bbot, AuGFP_SBILIST, |
3945 | + /*may_shrink*/1); | |
1facf9fc | 3946 | + if (p) |
3947 | + dinfo->di_hdentry = p; | |
4a4d8108 | 3948 | + /* harmless error */ |
1facf9fc | 3949 | +} |
3950 | + | |
3951 | +static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex, | |
5afbbe0d | 3952 | + const aufs_bindex_t bbot) |
1facf9fc | 3953 | +{ |
3954 | + struct au_hinode *hip, *p; | |
3955 | + | |
1308ab2a | 3956 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
3957 | + | |
5afbbe0d AM |
3958 | + hip = au_hinode(iinfo, bindex); |
3959 | + if (bindex < bbot) | |
3960 | + memmove(hip, hip + 1, sizeof(*hip) * (bbot - bindex)); | |
3961 | + /* au_hinode_init(au_hinode(iinfo, bbot)); */ | |
3962 | + iinfo->ii_bbot--; | |
1facf9fc | 3963 | + |
e2f27e51 AM |
3964 | + p = au_krealloc(iinfo->ii_hinode, sizeof(*p) * bbot, AuGFP_SBILIST, |
3965 | + /*may_shrink*/1); | |
1facf9fc | 3966 | + if (p) |
3967 | + iinfo->ii_hinode = p; | |
4a4d8108 | 3968 | + /* harmless error */ |
1facf9fc | 3969 | +} |
3970 | + | |
3971 | +static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex, | |
3972 | + struct au_branch *br) | |
3973 | +{ | |
5afbbe0d | 3974 | + aufs_bindex_t bbot; |
1facf9fc | 3975 | + struct au_sbinfo *sbinfo; |
53392da6 AM |
3976 | + struct dentry *root, *h_root; |
3977 | + struct inode *inode, *h_inode; | |
3978 | + struct au_hinode *hinode; | |
1facf9fc | 3979 | + |
dece6358 AM |
3980 | + SiMustWriteLock(sb); |
3981 | + | |
1facf9fc | 3982 | + root = sb->s_root; |
5527c038 | 3983 | + inode = d_inode(root); |
1facf9fc | 3984 | + sbinfo = au_sbi(sb); |
5afbbe0d | 3985 | + bbot = sbinfo->si_bbot; |
1facf9fc | 3986 | + |
53392da6 AM |
3987 | + h_root = au_h_dptr(root, bindex); |
3988 | + hinode = au_hi(inode, bindex); | |
3989 | + h_inode = au_igrab(hinode->hi_inode); | |
3990 | + au_hiput(hinode); | |
1facf9fc | 3991 | + |
53392da6 | 3992 | + au_sbilist_lock(); |
5afbbe0d AM |
3993 | + au_br_do_del_brp(sbinfo, bindex, bbot); |
3994 | + au_br_do_del_hdp(au_di(root), bindex, bbot); | |
3995 | + au_br_do_del_hip(au_ii(inode), bindex, bbot); | |
53392da6 AM |
3996 | + au_sbilist_unlock(); |
3997 | + | |
8b6a4947 AM |
3998 | + /* ignore an error */ |
3999 | + au_dr_br_fin(sb, br); /* always, regardless the mount option */ | |
4000 | + | |
53392da6 AM |
4001 | + dput(h_root); |
4002 | + iput(h_inode); | |
4003 | + au_br_do_free(br); | |
1facf9fc | 4004 | +} |
4005 | + | |
79b8bda9 AM |
4006 | +static unsigned long long empty_cb(struct super_block *sb, void *array, |
4007 | + unsigned long long max, void *arg) | |
076b876e AM |
4008 | +{ |
4009 | + return max; | |
4010 | +} | |
4011 | + | |
1facf9fc | 4012 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount) |
4013 | +{ | |
4014 | + int err, rerr, i; | |
076b876e | 4015 | + unsigned long long opened; |
1facf9fc | 4016 | + unsigned int mnt_flags; |
5afbbe0d | 4017 | + aufs_bindex_t bindex, bbot, br_id; |
1facf9fc | 4018 | + unsigned char do_wh, verbose; |
4019 | + struct au_branch *br; | |
4020 | + struct au_wbr *wbr; | |
076b876e AM |
4021 | + struct dentry *root; |
4022 | + struct file **to_free; | |
1facf9fc | 4023 | + |
4024 | + err = 0; | |
076b876e AM |
4025 | + opened = 0; |
4026 | + to_free = NULL; | |
4027 | + root = sb->s_root; | |
4028 | + bindex = au_find_dbindex(root, del->h_path.dentry); | |
1facf9fc | 4029 | + if (bindex < 0) { |
4030 | + if (remount) | |
4031 | + goto out; /* success */ | |
4032 | + err = -ENOENT; | |
4a4d8108 | 4033 | + pr_err("%s no such branch\n", del->pathname); |
1facf9fc | 4034 | + goto out; |
4035 | + } | |
4036 | + AuDbg("bindex b%d\n", bindex); | |
4037 | + | |
4038 | + err = -EBUSY; | |
4039 | + mnt_flags = au_mntflags(sb); | |
4040 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
5afbbe0d AM |
4041 | + bbot = au_sbbot(sb); |
4042 | + if (unlikely(!bbot)) { | |
1facf9fc | 4043 | + AuVerbose(verbose, "no more branches left\n"); |
4044 | + goto out; | |
4045 | + } | |
acd2b654 | 4046 | + |
1facf9fc | 4047 | + br = au_sbr(sb, bindex); |
86dc4139 | 4048 | + AuDebugOn(!path_equal(&br->br_path, &del->h_path)); |
acd2b654 AM |
4049 | + if (unlikely(au_lcnt_read(&br->br_count, /*do_rev*/1))) { |
4050 | + AuVerbose(verbose, "br %pd2 is busy now\n", del->h_path.dentry); | |
4051 | + goto out; | |
4052 | + } | |
076b876e AM |
4053 | + |
4054 | + br_id = br->br_id; | |
acd2b654 | 4055 | + opened = au_lcnt_read(&br->br_nfiles, /*do_rev*/1); |
076b876e | 4056 | + if (unlikely(opened)) { |
79b8bda9 | 4057 | + to_free = au_array_alloc(&opened, empty_cb, sb, NULL); |
076b876e AM |
4058 | + err = PTR_ERR(to_free); |
4059 | + if (IS_ERR(to_free)) | |
4060 | + goto out; | |
4061 | + | |
4062 | + err = test_file_busy(sb, br_id, to_free, opened); | |
4063 | + if (unlikely(err)) { | |
4064 | + AuVerbose(verbose, "%llu file(s) opened\n", opened); | |
4065 | + goto out; | |
4066 | + } | |
1facf9fc | 4067 | + } |
4068 | + | |
4069 | + wbr = br->br_wbr; | |
4070 | + do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph); | |
4071 | + if (do_wh) { | |
1308ab2a | 4072 | + /* instead of WbrWhMustWriteLock(wbr) */ |
4073 | + SiMustWriteLock(sb); | |
1facf9fc | 4074 | + for (i = 0; i < AuBrWh_Last; i++) { |
4075 | + dput(wbr->wbr_wh[i]); | |
4076 | + wbr->wbr_wh[i] = NULL; | |
4077 | + } | |
4078 | + } | |
4079 | + | |
076b876e | 4080 | + err = test_children_busy(root, bindex, verbose); |
1facf9fc | 4081 | + if (unlikely(err)) { |
4082 | + if (do_wh) | |
4083 | + goto out_wh; | |
4084 | + goto out; | |
4085 | + } | |
4086 | + | |
4087 | + err = 0; | |
076b876e AM |
4088 | + if (to_free) { |
4089 | + /* | |
4090 | + * now we confirmed the branch is deletable. | |
4091 | + * let's free the remaining opened dirs on the branch. | |
4092 | + */ | |
4093 | + di_write_unlock(root); | |
4094 | + br_del_file(to_free, opened, br_id); | |
4095 | + di_write_lock_child(root); | |
4096 | + } | |
4097 | + | |
062440b3 AM |
4098 | + sysaufs_brs_del(sb, bindex); /* remove successors */ |
4099 | + dbgaufs_xino_del(br); /* remove one */ | |
4100 | + au_br_do_del(sb, bindex, br); | |
4101 | + sysaufs_brs_add(sb, bindex); /* append successors */ | |
4102 | + dbgaufs_brs_add(sb, bindex, /*topdown*/1); /* rename successors */ | |
1facf9fc | 4103 | + |
1308ab2a | 4104 | + if (!bindex) { |
5527c038 | 4105 | + au_cpup_attr_all(d_inode(root), /*force*/1); |
1308ab2a | 4106 | + sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes; |
4107 | + } else | |
5527c038 | 4108 | + au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry)); |
1facf9fc | 4109 | + if (au_opt_test(mnt_flags, PLINK)) |
4110 | + au_plink_half_refresh(sb, br_id); | |
4111 | + | |
1facf9fc | 4112 | + goto out; /* success */ |
4113 | + | |
4f0767ce | 4114 | +out_wh: |
1facf9fc | 4115 | + /* revert */ |
86dc4139 | 4116 | + rerr = au_br_init_wh(sb, br, br->br_perm); |
1facf9fc | 4117 | + if (rerr) |
0c3ec466 AM |
4118 | + pr_warn("failed re-creating base whiteout, %s. (%d)\n", |
4119 | + del->pathname, rerr); | |
4f0767ce | 4120 | +out: |
076b876e AM |
4121 | + if (to_free) |
4122 | + au_farray_free(to_free, opened); | |
1facf9fc | 4123 | + return err; |
4124 | +} | |
4125 | + | |
4126 | +/* ---------------------------------------------------------------------- */ | |
4127 | + | |
027c5e7a AM |
4128 | +static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg) |
4129 | +{ | |
4130 | + int err; | |
5afbbe0d | 4131 | + aufs_bindex_t btop, bbot; |
027c5e7a AM |
4132 | + struct aufs_ibusy ibusy; |
4133 | + struct inode *inode, *h_inode; | |
4134 | + | |
4135 | + err = -EPERM; | |
4136 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
4137 | + goto out; | |
4138 | + | |
4139 | + err = copy_from_user(&ibusy, arg, sizeof(ibusy)); | |
4140 | + if (!err) | |
ba1aed25 AM |
4141 | + /* VERIFY_WRITE */ |
4142 | + err = !access_ok(&arg->h_ino, sizeof(arg->h_ino)); | |
027c5e7a AM |
4143 | + if (unlikely(err)) { |
4144 | + err = -EFAULT; | |
4145 | + AuTraceErr(err); | |
4146 | + goto out; | |
4147 | + } | |
4148 | + | |
4149 | + err = -EINVAL; | |
4150 | + si_read_lock(sb, AuLock_FLUSH); | |
5afbbe0d | 4151 | + if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbbot(sb))) |
027c5e7a AM |
4152 | + goto out_unlock; |
4153 | + | |
4154 | + err = 0; | |
4155 | + ibusy.h_ino = 0; /* invalid */ | |
4156 | + inode = ilookup(sb, ibusy.ino); | |
4157 | + if (!inode | |
4158 | + || inode->i_ino == AUFS_ROOT_INO | |
5afbbe0d | 4159 | + || au_is_bad_inode(inode)) |
027c5e7a AM |
4160 | + goto out_unlock; |
4161 | + | |
4162 | + ii_read_lock_child(inode); | |
5afbbe0d AM |
4163 | + btop = au_ibtop(inode); |
4164 | + bbot = au_ibbot(inode); | |
4165 | + if (btop <= ibusy.bindex && ibusy.bindex <= bbot) { | |
027c5e7a | 4166 | + h_inode = au_h_iptr(inode, ibusy.bindex); |
5afbbe0d | 4167 | + if (h_inode && au_test_ibusy(inode, btop, bbot)) |
027c5e7a AM |
4168 | + ibusy.h_ino = h_inode->i_ino; |
4169 | + } | |
4170 | + ii_read_unlock(inode); | |
4171 | + iput(inode); | |
4172 | + | |
4173 | +out_unlock: | |
4174 | + si_read_unlock(sb); | |
4175 | + if (!err) { | |
4176 | + err = __put_user(ibusy.h_ino, &arg->h_ino); | |
4177 | + if (unlikely(err)) { | |
4178 | + err = -EFAULT; | |
4179 | + AuTraceErr(err); | |
4180 | + } | |
4181 | + } | |
4182 | +out: | |
4183 | + return err; | |
4184 | +} | |
4185 | + | |
4186 | +long au_ibusy_ioctl(struct file *file, unsigned long arg) | |
4187 | +{ | |
2000de60 | 4188 | + return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg); |
027c5e7a AM |
4189 | +} |
4190 | + | |
4191 | +#ifdef CONFIG_COMPAT | |
4192 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg) | |
4193 | +{ | |
2000de60 | 4194 | + return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg)); |
027c5e7a AM |
4195 | +} |
4196 | +#endif | |
4197 | + | |
4198 | +/* ---------------------------------------------------------------------- */ | |
4199 | + | |
1facf9fc | 4200 | +/* |
4201 | + * change a branch permission | |
4202 | + */ | |
4203 | + | |
dece6358 AM |
4204 | +static void au_warn_ima(void) |
4205 | +{ | |
4206 | +#ifdef CONFIG_IMA | |
1308ab2a | 4207 | + /* since it doesn't support mark_files_ro() */ |
027c5e7a | 4208 | + AuWarn1("RW -> RO makes IMA to produce wrong message\n"); |
dece6358 AM |
4209 | +#endif |
4210 | +} | |
4211 | + | |
1facf9fc | 4212 | +static int do_need_sigen_inc(int a, int b) |
4213 | +{ | |
4214 | + return au_br_whable(a) && !au_br_whable(b); | |
4215 | +} | |
4216 | + | |
4217 | +static int need_sigen_inc(int old, int new) | |
4218 | +{ | |
4219 | + return do_need_sigen_inc(old, new) | |
4220 | + || do_need_sigen_inc(new, old); | |
4221 | +} | |
4222 | + | |
4223 | +static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex) | |
4224 | +{ | |
7f207e10 | 4225 | + int err, do_warn; |
027c5e7a | 4226 | + unsigned int mnt_flags; |
7f207e10 | 4227 | + unsigned long long ull, max; |
e49829fe | 4228 | + aufs_bindex_t br_id; |
38d290e6 | 4229 | + unsigned char verbose, writer; |
7f207e10 | 4230 | + struct file *file, *hf, **array; |
e49829fe | 4231 | + struct au_hfile *hfile; |
eca34b5c | 4232 | + struct inode *h_inode; |
1facf9fc | 4233 | + |
027c5e7a AM |
4234 | + mnt_flags = au_mntflags(sb); |
4235 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
4236 | + | |
7f207e10 AM |
4237 | + array = au_farray_alloc(sb, &max); |
4238 | + err = PTR_ERR(array); | |
4239 | + if (IS_ERR(array)) | |
1facf9fc | 4240 | + goto out; |
4241 | + | |
7f207e10 | 4242 | + do_warn = 0; |
e49829fe | 4243 | + br_id = au_sbr_id(sb, bindex); |
7f207e10 AM |
4244 | + for (ull = 0; ull < max; ull++) { |
4245 | + file = array[ull]; | |
076b876e AM |
4246 | + if (unlikely(!file)) |
4247 | + break; | |
1facf9fc | 4248 | + |
523b37e3 | 4249 | + /* AuDbg("%pD\n", file); */ |
1facf9fc | 4250 | + fi_read_lock(file); |
4251 | + if (unlikely(au_test_mmapped(file))) { | |
4252 | + err = -EBUSY; | |
523b37e3 | 4253 | + AuVerbose(verbose, "mmapped %pD\n", file); |
7f207e10 | 4254 | + AuDbgFile(file); |
1facf9fc | 4255 | + FiMustNoWaiters(file); |
4256 | + fi_read_unlock(file); | |
7f207e10 | 4257 | + goto out_array; |
1facf9fc | 4258 | + } |
4259 | + | |
e49829fe JR |
4260 | + hfile = &au_fi(file)->fi_htop; |
4261 | + hf = hfile->hf_file; | |
7e9cd9fe | 4262 | + if (!d_is_reg(file->f_path.dentry) |
1facf9fc | 4263 | + || !(file->f_mode & FMODE_WRITE) |
e49829fe | 4264 | + || hfile->hf_br->br_id != br_id |
7f207e10 AM |
4265 | + || !(hf->f_mode & FMODE_WRITE)) |
4266 | + array[ull] = NULL; | |
4267 | + else { | |
4268 | + do_warn = 1; | |
4269 | + get_file(file); | |
1facf9fc | 4270 | + } |
4271 | + | |
1facf9fc | 4272 | + FiMustNoWaiters(file); |
4273 | + fi_read_unlock(file); | |
7f207e10 AM |
4274 | + fput(file); |
4275 | + } | |
1facf9fc | 4276 | + |
4277 | + err = 0; | |
7f207e10 | 4278 | + if (do_warn) |
dece6358 | 4279 | + au_warn_ima(); |
7f207e10 AM |
4280 | + |
4281 | + for (ull = 0; ull < max; ull++) { | |
4282 | + file = array[ull]; | |
4283 | + if (!file) | |
4284 | + continue; | |
4285 | + | |
1facf9fc | 4286 | + /* todo: already flushed? */ |
523b37e3 AM |
4287 | + /* |
4288 | + * fs/super.c:mark_files_ro() is gone, but aufs keeps its | |
4289 | + * approach which resets f_mode and calls mnt_drop_write() and | |
4290 | + * file_release_write() for each file, because the branch | |
4291 | + * attribute in aufs world is totally different from the native | |
4292 | + * fs rw/ro mode. | |
4293 | + */ | |
7f207e10 AM |
4294 | + /* fi_read_lock(file); */ |
4295 | + hfile = &au_fi(file)->fi_htop; | |
4296 | + hf = hfile->hf_file; | |
4297 | + /* fi_read_unlock(file); */ | |
027c5e7a | 4298 | + spin_lock(&hf->f_lock); |
38d290e6 JR |
4299 | + writer = !!(hf->f_mode & FMODE_WRITER); |
4300 | + hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER); | |
027c5e7a | 4301 | + spin_unlock(&hf->f_lock); |
38d290e6 | 4302 | + if (writer) { |
eca34b5c AM |
4303 | + h_inode = file_inode(hf); |
4304 | + put_write_access(h_inode); | |
c06a8ce3 | 4305 | + __mnt_drop_write(hf->f_path.mnt); |
eca34b5c AM |
4306 | + if ((hf->f_mode & (FMODE_READ | FMODE_WRITE)) |
4307 | + == FMODE_READ) | |
4308 | + i_readcount_inc(h_inode); | |
1facf9fc | 4309 | + } |
4310 | + } | |
4311 | + | |
7f207e10 AM |
4312 | +out_array: |
4313 | + au_farray_free(array, max); | |
4f0767ce | 4314 | +out: |
7f207e10 | 4315 | + AuTraceErr(err); |
1facf9fc | 4316 | + return err; |
4317 | +} | |
4318 | + | |
4319 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 4320 | + int *do_refresh) |
1facf9fc | 4321 | +{ |
4322 | + int err, rerr; | |
4323 | + aufs_bindex_t bindex; | |
4324 | + struct dentry *root; | |
4325 | + struct au_branch *br; | |
076b876e | 4326 | + struct au_br_fhsm *bf; |
1facf9fc | 4327 | + |
4328 | + root = sb->s_root; | |
1facf9fc | 4329 | + bindex = au_find_dbindex(root, mod->h_root); |
4330 | + if (bindex < 0) { | |
4331 | + if (remount) | |
4332 | + return 0; /* success */ | |
4333 | + err = -ENOENT; | |
4a4d8108 | 4334 | + pr_err("%s no such branch\n", mod->path); |
1facf9fc | 4335 | + goto out; |
4336 | + } | |
4337 | + AuDbg("bindex b%d\n", bindex); | |
4338 | + | |
5527c038 | 4339 | + err = test_br(d_inode(mod->h_root), mod->perm, mod->path); |
1facf9fc | 4340 | + if (unlikely(err)) |
4341 | + goto out; | |
4342 | + | |
4343 | + br = au_sbr(sb, bindex); | |
86dc4139 | 4344 | + AuDebugOn(mod->h_root != au_br_dentry(br)); |
1facf9fc | 4345 | + if (br->br_perm == mod->perm) |
4346 | + return 0; /* success */ | |
4347 | + | |
076b876e AM |
4348 | + /* pre-allocate for non-fhsm --> fhsm */ |
4349 | + bf = NULL; | |
4350 | + if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) { | |
4351 | + err = au_fhsm_br_alloc(br); | |
4352 | + if (unlikely(err)) | |
4353 | + goto out; | |
4354 | + bf = br->br_fhsm; | |
4355 | + br->br_fhsm = NULL; | |
4356 | + } | |
4357 | + | |
1facf9fc | 4358 | + if (au_br_writable(br->br_perm)) { |
4359 | + /* remove whiteout base */ | |
86dc4139 | 4360 | + err = au_br_init_wh(sb, br, mod->perm); |
1facf9fc | 4361 | + if (unlikely(err)) |
076b876e | 4362 | + goto out_bf; |
1facf9fc | 4363 | + |
4364 | + if (!au_br_writable(mod->perm)) { | |
4365 | + /* rw --> ro, file might be mmapped */ | |
4366 | + DiMustNoWaiters(root); | |
5527c038 | 4367 | + IiMustNoWaiters(d_inode(root)); |
1facf9fc | 4368 | + di_write_unlock(root); |
4369 | + err = au_br_mod_files_ro(sb, bindex); | |
4370 | + /* aufs_write_lock() calls ..._child() */ | |
4371 | + di_write_lock_child(root); | |
4372 | + | |
4373 | + if (unlikely(err)) { | |
4374 | + rerr = -ENOMEM; | |
be52b249 | 4375 | + br->br_wbr = kzalloc(sizeof(*br->br_wbr), |
1facf9fc | 4376 | + GFP_NOFS); |
86dc4139 AM |
4377 | + if (br->br_wbr) |
4378 | + rerr = au_wbr_init(br, sb, br->br_perm); | |
1facf9fc | 4379 | + if (unlikely(rerr)) { |
4380 | + AuIOErr("nested error %d (%d)\n", | |
4381 | + rerr, err); | |
4382 | + br->br_perm = mod->perm; | |
4383 | + } | |
4384 | + } | |
4385 | + } | |
4386 | + } else if (au_br_writable(mod->perm)) { | |
4387 | + /* ro --> rw */ | |
4388 | + err = -ENOMEM; | |
be52b249 | 4389 | + br->br_wbr = kzalloc(sizeof(*br->br_wbr), GFP_NOFS); |
1facf9fc | 4390 | + if (br->br_wbr) { |
86dc4139 | 4391 | + err = au_wbr_init(br, sb, mod->perm); |
1facf9fc | 4392 | + if (unlikely(err)) { |
9f237c51 | 4393 | + au_kfree_rcu(br->br_wbr); |
1facf9fc | 4394 | + br->br_wbr = NULL; |
4395 | + } | |
4396 | + } | |
4397 | + } | |
076b876e AM |
4398 | + if (unlikely(err)) |
4399 | + goto out_bf; | |
4400 | + | |
4401 | + if (au_br_fhsm(br->br_perm)) { | |
4402 | + if (!au_br_fhsm(mod->perm)) { | |
4403 | + /* fhsm --> non-fhsm */ | |
4404 | + au_br_fhsm_fin(br->br_fhsm); | |
9f237c51 | 4405 | + au_kfree_rcu(br->br_fhsm); |
076b876e AM |
4406 | + br->br_fhsm = NULL; |
4407 | + } | |
4408 | + } else if (au_br_fhsm(mod->perm)) | |
4409 | + /* non-fhsm --> fhsm */ | |
4410 | + br->br_fhsm = bf; | |
4411 | + | |
076b876e AM |
4412 | + *do_refresh |= need_sigen_inc(br->br_perm, mod->perm); |
4413 | + br->br_perm = mod->perm; | |
4414 | + goto out; /* success */ | |
1facf9fc | 4415 | + |
076b876e | 4416 | +out_bf: |
9f237c51 | 4417 | + au_kfree_try_rcu(bf); |
076b876e AM |
4418 | +out: |
4419 | + AuTraceErr(err); | |
4420 | + return err; | |
4421 | +} | |
4422 | + | |
4423 | +/* ---------------------------------------------------------------------- */ | |
4424 | + | |
4425 | +int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs) | |
4426 | +{ | |
4427 | + int err; | |
4428 | + struct kstatfs kstfs; | |
4429 | + | |
4430 | + err = vfs_statfs(&br->br_path, &kstfs); | |
1facf9fc | 4431 | + if (!err) { |
076b876e AM |
4432 | + stfs->f_blocks = kstfs.f_blocks; |
4433 | + stfs->f_bavail = kstfs.f_bavail; | |
4434 | + stfs->f_files = kstfs.f_files; | |
4435 | + stfs->f_ffree = kstfs.f_ffree; | |
1facf9fc | 4436 | + } |
4437 | + | |
1facf9fc | 4438 | + return err; |
4439 | +} | |
7f207e10 | 4440 | diff -urN /usr/share/empty/fs/aufs/branch.h linux/fs/aufs/branch.h |
eca34b5c | 4441 | --- /usr/share/empty/fs/aufs/branch.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 4442 | +++ linux/fs/aufs/branch.h 2020-01-27 10:57:18.165538015 +0100 |
83b672a5 | 4443 | @@ -0,0 +1,366 @@ |
062440b3 | 4444 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 4445 | +/* |
016522bc | 4446 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 4447 | + * |
4448 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4449 | + * it under the terms of the GNU General Public License as published by | |
4450 | + * the Free Software Foundation; either version 2 of the License, or | |
4451 | + * (at your option) any later version. | |
dece6358 AM |
4452 | + * |
4453 | + * This program is distributed in the hope that it will be useful, | |
4454 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4455 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4456 | + * GNU General Public License for more details. | |
4457 | + * | |
4458 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 4459 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 4460 | + */ |
4461 | + | |
4462 | +/* | |
4463 | + * branch filesystems and xino for them | |
4464 | + */ | |
4465 | + | |
4466 | +#ifndef __AUFS_BRANCH_H__ | |
4467 | +#define __AUFS_BRANCH_H__ | |
4468 | + | |
4469 | +#ifdef __KERNEL__ | |
4470 | + | |
1facf9fc | 4471 | +#include <linux/mount.h> |
8b6a4947 | 4472 | +#include "dirren.h" |
4a4d8108 | 4473 | +#include "dynop.h" |
acd2b654 | 4474 | +#include "lcnt.h" |
1facf9fc | 4475 | +#include "rwsem.h" |
4476 | +#include "super.h" | |
4477 | + | |
4478 | +/* ---------------------------------------------------------------------- */ | |
4479 | + | |
4480 | +/* a xino file */ | |
062440b3 | 4481 | +struct au_xino { |
acd2b654 AM |
4482 | + struct file **xi_file; |
4483 | + unsigned int xi_nfile; | |
4484 | + | |
521ced18 JR |
4485 | + struct { |
4486 | + spinlock_t spin; | |
4487 | + ino_t *array; | |
4488 | + int total; | |
4489 | + /* reserved for future use */ | |
4490 | + /* unsigned long *bitmap; */ | |
4491 | + wait_queue_head_t wqh; | |
4492 | + } xi_nondir; | |
1facf9fc | 4493 | + |
acd2b654 | 4494 | + struct mutex xi_mtx; /* protects xi_file array */ |
9f237c51 | 4495 | + struct hlist_bl_head xi_writing; |
acd2b654 | 4496 | + |
062440b3 | 4497 | + atomic_t xi_truncating; |
1facf9fc | 4498 | + |
062440b3 | 4499 | + struct kref xi_kref; |
1facf9fc | 4500 | +}; |
4501 | + | |
076b876e AM |
4502 | +/* File-based Hierarchical Storage Management */ |
4503 | +struct au_br_fhsm { | |
4504 | +#ifdef CONFIG_AUFS_FHSM | |
4505 | + struct mutex bf_lock; | |
4506 | + unsigned long bf_jiffy; | |
4507 | + struct aufs_stfs bf_stfs; | |
4508 | + int bf_readable; | |
4509 | +#endif | |
4510 | +}; | |
4511 | + | |
1facf9fc | 4512 | +/* members for writable branch only */ |
4513 | +enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last}; | |
4514 | +struct au_wbr { | |
dece6358 | 4515 | + struct au_rwsem wbr_wh_rwsem; |
1facf9fc | 4516 | + struct dentry *wbr_wh[AuBrWh_Last]; |
4a4d8108 | 4517 | + atomic_t wbr_wh_running; |
1facf9fc | 4518 | +#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */ |
4519 | +#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */ | |
4520 | +#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */ | |
4521 | + | |
4522 | + /* mfs mode */ | |
4523 | + unsigned long long wbr_bytes; | |
4524 | +}; | |
4525 | + | |
4a4d8108 AM |
4526 | +/* ext2 has 3 types of operations at least, ext3 has 4 */ |
4527 | +#define AuBrDynOp (AuDyLast * 4) | |
4528 | + | |
1716fcea AM |
4529 | +#ifdef CONFIG_AUFS_HFSNOTIFY |
4530 | +/* support for asynchronous destruction */ | |
4531 | +struct au_br_hfsnotify { | |
4532 | + struct fsnotify_group *hfsn_group; | |
4533 | +}; | |
4534 | +#endif | |
4535 | + | |
392086de AM |
4536 | +/* sysfs entries */ |
4537 | +struct au_brsysfs { | |
4538 | + char name[16]; | |
4539 | + struct attribute attr; | |
4540 | +}; | |
4541 | + | |
4542 | +enum { | |
4543 | + AuBrSysfs_BR, | |
4544 | + AuBrSysfs_BRID, | |
4545 | + AuBrSysfs_Last | |
4546 | +}; | |
4547 | + | |
1facf9fc | 4548 | +/* protected by superblock rwsem */ |
4549 | +struct au_branch { | |
062440b3 | 4550 | + struct au_xino *br_xino; |
1facf9fc | 4551 | + |
4552 | + aufs_bindex_t br_id; | |
4553 | + | |
4554 | + int br_perm; | |
86dc4139 | 4555 | + struct path br_path; |
4a4d8108 AM |
4556 | + spinlock_t br_dykey_lock; |
4557 | + struct au_dykey *br_dykey[AuBrDynOp]; | |
acd2b654 AM |
4558 | + au_lcnt_t br_nfiles; /* opened files */ |
4559 | + au_lcnt_t br_count; /* in-use for other */ | |
1facf9fc | 4560 | + |
4561 | + struct au_wbr *br_wbr; | |
076b876e | 4562 | + struct au_br_fhsm *br_fhsm; |
1facf9fc | 4563 | + |
027c5e7a | 4564 | +#ifdef CONFIG_AUFS_HFSNOTIFY |
1716fcea | 4565 | + struct au_br_hfsnotify *br_hfsn; |
027c5e7a AM |
4566 | +#endif |
4567 | + | |
1facf9fc | 4568 | +#ifdef CONFIG_SYSFS |
392086de AM |
4569 | + /* entries under sysfs per mount-point */ |
4570 | + struct au_brsysfs br_sysfs[AuBrSysfs_Last]; | |
1facf9fc | 4571 | +#endif |
8b6a4947 | 4572 | + |
062440b3 AM |
4573 | +#ifdef CONFIG_DEBUG_FS |
4574 | + struct dentry *br_dbgaufs; /* xino */ | |
4575 | +#endif | |
4576 | + | |
8b6a4947 | 4577 | + struct au_dr_br br_dirren; |
1facf9fc | 4578 | +}; |
4579 | + | |
4580 | +/* ---------------------------------------------------------------------- */ | |
4581 | + | |
86dc4139 AM |
4582 | +static inline struct vfsmount *au_br_mnt(struct au_branch *br) |
4583 | +{ | |
4584 | + return br->br_path.mnt; | |
4585 | +} | |
4586 | + | |
4587 | +static inline struct dentry *au_br_dentry(struct au_branch *br) | |
4588 | +{ | |
4589 | + return br->br_path.dentry; | |
4590 | +} | |
4591 | + | |
4592 | +static inline struct super_block *au_br_sb(struct au_branch *br) | |
4593 | +{ | |
4594 | + return au_br_mnt(br)->mnt_sb; | |
4595 | +} | |
4596 | + | |
1facf9fc | 4597 | +static inline int au_br_rdonly(struct au_branch *br) |
4598 | +{ | |
8b6a4947 | 4599 | + return (sb_rdonly(au_br_sb(br)) |
1facf9fc | 4600 | + || !au_br_writable(br->br_perm)) |
4601 | + ? -EROFS : 0; | |
4602 | +} | |
4603 | + | |
4a4d8108 | 4604 | +static inline int au_br_hnotifyable(int brperm __maybe_unused) |
1facf9fc | 4605 | +{ |
4a4d8108 | 4606 | +#ifdef CONFIG_AUFS_HNOTIFY |
1e00d052 | 4607 | + return !(brperm & AuBrPerm_RR); |
1facf9fc | 4608 | +#else |
4609 | + return 0; | |
4610 | +#endif | |
4611 | +} | |
4612 | + | |
b912730e AM |
4613 | +static inline int au_br_test_oflag(int oflag, struct au_branch *br) |
4614 | +{ | |
4615 | + int err, exec_flag; | |
4616 | + | |
4617 | + err = 0; | |
4618 | + exec_flag = oflag & __FMODE_EXEC; | |
79b8bda9 | 4619 | + if (unlikely(exec_flag && path_noexec(&br->br_path))) |
b912730e AM |
4620 | + err = -EACCES; |
4621 | + | |
4622 | + return err; | |
4623 | +} | |
4624 | + | |
062440b3 AM |
4625 | +static inline void au_xino_get(struct au_branch *br) |
4626 | +{ | |
4627 | + struct au_xino *xi; | |
4628 | + | |
4629 | + xi = br->br_xino; | |
4630 | + if (xi) | |
4631 | + kref_get(&xi->xi_kref); | |
4632 | +} | |
4633 | + | |
4634 | +static inline int au_xino_count(struct au_branch *br) | |
4635 | +{ | |
4636 | + int v; | |
4637 | + struct au_xino *xi; | |
4638 | + | |
4639 | + v = 0; | |
4640 | + xi = br->br_xino; | |
4641 | + if (xi) | |
4642 | + v = kref_read(&xi->xi_kref); | |
4643 | + | |
4644 | + return v; | |
4645 | +} | |
4646 | + | |
1facf9fc | 4647 | +/* ---------------------------------------------------------------------- */ |
4648 | + | |
4649 | +/* branch.c */ | |
4650 | +struct au_sbinfo; | |
4651 | +void au_br_free(struct au_sbinfo *sinfo); | |
4652 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id); | |
4653 | +struct au_opt_add; | |
4654 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount); | |
4655 | +struct au_opt_del; | |
4656 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount); | |
027c5e7a AM |
4657 | +long au_ibusy_ioctl(struct file *file, unsigned long arg); |
4658 | +#ifdef CONFIG_COMPAT | |
4659 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg); | |
4660 | +#endif | |
1facf9fc | 4661 | +struct au_opt_mod; |
4662 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 4663 | + int *do_refresh); |
076b876e AM |
4664 | +struct aufs_stfs; |
4665 | +int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs); | |
1facf9fc | 4666 | + |
4667 | +/* xino.c */ | |
4668 | +static const loff_t au_loff_max = LLONG_MAX; | |
4669 | + | |
acd2b654 | 4670 | +aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry); |
83b672a5 AM |
4671 | +struct file *au_xino_create(struct super_block *sb, char *fpath, int silent, |
4672 | + int wbrtop); | |
062440b3 AM |
4673 | +struct file *au_xino_create2(struct super_block *sb, struct path *base, |
4674 | + struct file *copy_src); | |
acd2b654 AM |
4675 | +struct au_xi_new { |
4676 | + struct au_xino *xi; /* switch between xino and xigen */ | |
4677 | + int idx; | |
4678 | + struct path *base; | |
4679 | + struct file *copy_src; | |
4680 | +}; | |
4681 | +struct file *au_xi_new(struct super_block *sb, struct au_xi_new *xinew); | |
062440b3 AM |
4682 | + |
4683 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4684 | + ino_t *ino); | |
4685 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4686 | + ino_t ino); | |
5527c038 | 4687 | +ssize_t xino_fread(vfs_readf_t func, struct file *file, void *buf, size_t size, |
1facf9fc | 4688 | + loff_t *pos); |
5527c038 JR |
4689 | +ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, |
4690 | + size_t size, loff_t *pos); | |
062440b3 AM |
4691 | + |
4692 | +int au_xib_trunc(struct super_block *sb); | |
acd2b654 | 4693 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex, int idx_begin); |
1facf9fc | 4694 | + |
acd2b654 | 4695 | +struct au_xino *au_xino_alloc(unsigned int nfile); |
062440b3 | 4696 | +int au_xino_put(struct au_branch *br); |
acd2b654 | 4697 | +struct file *au_xino_file1(struct au_xino *xi); |
062440b3 | 4698 | + |
1facf9fc | 4699 | +struct au_opt_xino; |
1facf9fc | 4700 | +void au_xino_clr(struct super_block *sb); |
062440b3 | 4701 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount); |
1facf9fc | 4702 | +struct file *au_xino_def(struct super_block *sb); |
062440b3 AM |
4703 | +int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t hino, |
4704 | + struct path *base); | |
4705 | + | |
4706 | +ino_t au_xino_new_ino(struct super_block *sb); | |
4707 | +void au_xino_delete_inode(struct inode *inode, const int unlinked); | |
1facf9fc | 4708 | + |
521ced18 JR |
4709 | +void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, |
4710 | + ino_t h_ino, int idx); | |
4711 | +int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4712 | + int *idx); | |
4713 | + | |
062440b3 AM |
4714 | +int au_xino_path(struct seq_file *seq, struct file *file); |
4715 | + | |
1facf9fc | 4716 | +/* ---------------------------------------------------------------------- */ |
4717 | + | |
acd2b654 AM |
4718 | +/* @idx is signed to accept -1 meaning the first file */ |
4719 | +static inline struct file *au_xino_file(struct au_xino *xi, int idx) | |
4720 | +{ | |
4721 | + struct file *file; | |
4722 | + | |
4723 | + file = NULL; | |
4724 | + if (!xi) | |
4725 | + goto out; | |
4726 | + | |
4727 | + if (idx >= 0) { | |
4728 | + if (idx < xi->xi_nfile) | |
4729 | + file = xi->xi_file[idx]; | |
4730 | + } else | |
4731 | + file = au_xino_file1(xi); | |
4732 | + | |
4733 | +out: | |
4734 | + return file; | |
4735 | +} | |
4736 | + | |
4737 | +/* ---------------------------------------------------------------------- */ | |
4738 | + | |
1facf9fc | 4739 | +/* Superblock to branch */ |
4740 | +static inline | |
4741 | +aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex) | |
4742 | +{ | |
4743 | + return au_sbr(sb, bindex)->br_id; | |
4744 | +} | |
4745 | + | |
4746 | +static inline | |
4747 | +struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex) | |
4748 | +{ | |
86dc4139 | 4749 | + return au_br_mnt(au_sbr(sb, bindex)); |
1facf9fc | 4750 | +} |
4751 | + | |
4752 | +static inline | |
4753 | +struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex) | |
4754 | +{ | |
86dc4139 | 4755 | + return au_br_sb(au_sbr(sb, bindex)); |
1facf9fc | 4756 | +} |
4757 | + | |
1facf9fc | 4758 | +static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex) |
4759 | +{ | |
4760 | + return au_sbr(sb, bindex)->br_perm; | |
4761 | +} | |
4762 | + | |
4763 | +static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex) | |
4764 | +{ | |
4765 | + return au_br_whable(au_sbr_perm(sb, bindex)); | |
4766 | +} | |
4767 | + | |
4768 | +/* ---------------------------------------------------------------------- */ | |
4769 | + | |
8b6a4947 AM |
4770 | +#define wbr_wh_read_lock(wbr) au_rw_read_lock(&(wbr)->wbr_wh_rwsem) |
4771 | +#define wbr_wh_write_lock(wbr) au_rw_write_lock(&(wbr)->wbr_wh_rwsem) | |
4772 | +#define wbr_wh_read_trylock(wbr) au_rw_read_trylock(&(wbr)->wbr_wh_rwsem) | |
4773 | +#define wbr_wh_write_trylock(wbr) au_rw_write_trylock(&(wbr)->wbr_wh_rwsem) | |
1facf9fc | 4774 | +/* |
8b6a4947 AM |
4775 | +#define wbr_wh_read_trylock_nested(wbr) \ |
4776 | + au_rw_read_trylock_nested(&(wbr)->wbr_wh_rwsem) | |
4777 | +#define wbr_wh_write_trylock_nested(wbr) \ | |
4778 | + au_rw_write_trylock_nested(&(wbr)->wbr_wh_rwsem) | |
4779 | +*/ | |
1facf9fc | 4780 | + |
8b6a4947 AM |
4781 | +#define wbr_wh_read_unlock(wbr) au_rw_read_unlock(&(wbr)->wbr_wh_rwsem) |
4782 | +#define wbr_wh_write_unlock(wbr) au_rw_write_unlock(&(wbr)->wbr_wh_rwsem) | |
4783 | +#define wbr_wh_downgrade_lock(wbr) au_rw_dgrade_lock(&(wbr)->wbr_wh_rwsem) | |
4784 | + | |
4785 | +#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&(wbr)->wbr_wh_rwsem) | |
4786 | +#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&(wbr)->wbr_wh_rwsem) | |
4787 | +#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&(wbr)->wbr_wh_rwsem) | |
dece6358 | 4788 | + |
076b876e AM |
4789 | +/* ---------------------------------------------------------------------- */ |
4790 | + | |
4791 | +#ifdef CONFIG_AUFS_FHSM | |
4792 | +static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm) | |
4793 | +{ | |
4794 | + mutex_init(&brfhsm->bf_lock); | |
4795 | + brfhsm->bf_jiffy = 0; | |
4796 | + brfhsm->bf_readable = 0; | |
4797 | +} | |
4798 | + | |
4799 | +static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm) | |
4800 | +{ | |
4801 | + mutex_destroy(&brfhsm->bf_lock); | |
4802 | +} | |
4803 | +#else | |
4804 | +AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm) | |
4805 | +AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm) | |
4806 | +#endif | |
4807 | + | |
1facf9fc | 4808 | +#endif /* __KERNEL__ */ |
4809 | +#endif /* __AUFS_BRANCH_H__ */ | |
7f207e10 | 4810 | diff -urN /usr/share/empty/fs/aufs/conf.mk linux/fs/aufs/conf.mk |
eca34b5c AM |
4811 | --- /usr/share/empty/fs/aufs/conf.mk 1970-01-01 01:00:00.000000000 +0100 |
4812 | +++ linux/fs/aufs/conf.mk 2019-07-11 15:42:14.462237786 +0200 | |
2121bcd9 AM |
4813 | @@ -0,0 +1,40 @@ |
4814 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
4815 | + |
4816 | +AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS} | |
4817 | + | |
4818 | +define AuConf | |
4819 | +ifdef ${1} | |
4820 | +AuConfStr += ${1}=${${1}} | |
4821 | +endif | |
4822 | +endef | |
4823 | + | |
b752ccd1 | 4824 | +AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \ |
e49829fe | 4825 | + SBILIST \ |
7f207e10 | 4826 | + HNOTIFY HFSNOTIFY \ |
4a4d8108 | 4827 | + EXPORT INO_T_64 \ |
c1595e42 | 4828 | + XATTR \ |
076b876e | 4829 | + FHSM \ |
4a4d8108 | 4830 | + RDU \ |
8b6a4947 | 4831 | + DIRREN \ |
4a4d8108 AM |
4832 | + SHWH \ |
4833 | + BR_RAMFS \ | |
4834 | + BR_FUSE POLL \ | |
4835 | + BR_HFSPLUS \ | |
4836 | + BDEV_LOOP \ | |
b752ccd1 AM |
4837 | + DEBUG MAGIC_SYSRQ |
4838 | +$(foreach i, ${AuConfAll}, \ | |
4a4d8108 AM |
4839 | + $(eval $(call AuConf,CONFIG_AUFS_${i}))) |
4840 | + | |
4841 | +AuConfName = ${obj}/conf.str | |
4842 | +${AuConfName}.tmp: FORCE | |
4843 | + @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@ | |
4844 | +${AuConfName}: ${AuConfName}.tmp | |
4845 | + @diff -q $< $@ > /dev/null 2>&1 || { \ | |
4846 | + echo ' GEN ' $@; \ | |
4847 | + cp -p $< $@; \ | |
4848 | + } | |
4849 | +FORCE: | |
4850 | +clean-files += ${AuConfName} ${AuConfName}.tmp | |
4851 | +${obj}/sysfs.o: ${AuConfName} | |
b752ccd1 AM |
4852 | + |
4853 | +-include ${srctree}/${src}/conf_priv.mk | |
7f207e10 | 4854 | diff -urN /usr/share/empty/fs/aufs/cpup.c linux/fs/aufs/cpup.c |
eca34b5c | 4855 | --- /usr/share/empty/fs/aufs/cpup.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 4856 | +++ linux/fs/aufs/cpup.c 2020-01-27 10:57:18.165538015 +0100 |
9f237c51 | 4857 | @@ -0,0 +1,1458 @@ |
cd7a4cd9 | 4858 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 4859 | +/* |
016522bc | 4860 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 4861 | + * |
4862 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4863 | + * it under the terms of the GNU General Public License as published by | |
4864 | + * the Free Software Foundation; either version 2 of the License, or | |
4865 | + * (at your option) any later version. | |
dece6358 AM |
4866 | + * |
4867 | + * This program is distributed in the hope that it will be useful, | |
4868 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4869 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4870 | + * GNU General Public License for more details. | |
4871 | + * | |
4872 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 4873 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 4874 | + */ |
4875 | + | |
4876 | +/* | |
4877 | + * copy-up functions, see wbr_policy.c for copy-down | |
4878 | + */ | |
4879 | + | |
4880 | +#include <linux/fs_stack.h> | |
dece6358 | 4881 | +#include <linux/mm.h> |
8cdd5066 | 4882 | +#include <linux/task_work.h> |
1facf9fc | 4883 | +#include "aufs.h" |
4884 | + | |
86dc4139 | 4885 | +void au_cpup_attr_flags(struct inode *dst, unsigned int iflags) |
1facf9fc | 4886 | +{ |
4887 | + const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE | |
367653fa | 4888 | + | S_NOATIME | S_NOCMTIME | S_AUTOMOUNT; |
1facf9fc | 4889 | + |
86dc4139 AM |
4890 | + BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags)); |
4891 | + | |
4892 | + dst->i_flags |= iflags & ~mask; | |
1facf9fc | 4893 | + if (au_test_fs_notime(dst->i_sb)) |
4894 | + dst->i_flags |= S_NOATIME | S_NOCMTIME; | |
4895 | +} | |
4896 | + | |
4897 | +void au_cpup_attr_timesizes(struct inode *inode) | |
4898 | +{ | |
4899 | + struct inode *h_inode; | |
4900 | + | |
5afbbe0d | 4901 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 4902 | + fsstack_copy_attr_times(inode, h_inode); |
4a4d8108 | 4903 | + fsstack_copy_inode_size(inode, h_inode); |
1facf9fc | 4904 | +} |
4905 | + | |
4906 | +void au_cpup_attr_nlink(struct inode *inode, int force) | |
4907 | +{ | |
4908 | + struct inode *h_inode; | |
4909 | + struct super_block *sb; | |
5afbbe0d | 4910 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 4911 | + |
4912 | + sb = inode->i_sb; | |
5afbbe0d | 4913 | + bindex = au_ibtop(inode); |
1facf9fc | 4914 | + h_inode = au_h_iptr(inode, bindex); |
4915 | + if (!force | |
4916 | + && !S_ISDIR(h_inode->i_mode) | |
4917 | + && au_opt_test(au_mntflags(sb), PLINK) | |
4918 | + && au_plink_test(inode)) | |
4919 | + return; | |
4920 | + | |
7eafdf33 AM |
4921 | + /* |
4922 | + * 0 can happen in revalidating. | |
38d290e6 JR |
4923 | + * h_inode->i_mutex may not be held here, but it is harmless since once |
4924 | + * i_nlink reaches 0, it will never become positive except O_TMPFILE | |
4925 | + * case. | |
4926 | + * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause | |
4927 | + * the incorrect link count. | |
7eafdf33 | 4928 | + */ |
92d182d2 | 4929 | + set_nlink(inode, h_inode->i_nlink); |
1facf9fc | 4930 | + |
4931 | + /* | |
4932 | + * fewer nlink makes find(1) noisy, but larger nlink doesn't. | |
4933 | + * it may includes whplink directory. | |
4934 | + */ | |
4935 | + if (S_ISDIR(h_inode->i_mode)) { | |
5afbbe0d AM |
4936 | + bbot = au_ibbot(inode); |
4937 | + for (bindex++; bindex <= bbot; bindex++) { | |
1facf9fc | 4938 | + h_inode = au_h_iptr(inode, bindex); |
4939 | + if (h_inode) | |
4940 | + au_add_nlink(inode, h_inode); | |
4941 | + } | |
4942 | + } | |
4943 | +} | |
4944 | + | |
4945 | +void au_cpup_attr_changeable(struct inode *inode) | |
4946 | +{ | |
4947 | + struct inode *h_inode; | |
4948 | + | |
5afbbe0d | 4949 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 4950 | + inode->i_mode = h_inode->i_mode; |
4951 | + inode->i_uid = h_inode->i_uid; | |
4952 | + inode->i_gid = h_inode->i_gid; | |
4953 | + au_cpup_attr_timesizes(inode); | |
86dc4139 | 4954 | + au_cpup_attr_flags(inode, h_inode->i_flags); |
1facf9fc | 4955 | +} |
4956 | + | |
4957 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode) | |
4958 | +{ | |
4959 | + struct au_iinfo *iinfo = au_ii(inode); | |
4960 | + | |
1308ab2a | 4961 | + IiMustWriteLock(inode); |
4962 | + | |
1facf9fc | 4963 | + iinfo->ii_higen = h_inode->i_generation; |
4964 | + iinfo->ii_hsb1 = h_inode->i_sb; | |
4965 | +} | |
4966 | + | |
4967 | +void au_cpup_attr_all(struct inode *inode, int force) | |
4968 | +{ | |
4969 | + struct inode *h_inode; | |
4970 | + | |
5afbbe0d | 4971 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 4972 | + au_cpup_attr_changeable(inode); |
4973 | + if (inode->i_nlink > 0) | |
4974 | + au_cpup_attr_nlink(inode, force); | |
4975 | + inode->i_rdev = h_inode->i_rdev; | |
4976 | + inode->i_blkbits = h_inode->i_blkbits; | |
4977 | + au_cpup_igen(inode, h_inode); | |
4978 | +} | |
4979 | + | |
4980 | +/* ---------------------------------------------------------------------- */ | |
4981 | + | |
4982 | +/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ | |
4983 | + | |
4984 | +/* keep the timestamps of the parent dir when cpup */ | |
4985 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
4986 | + struct path *h_path) | |
4987 | +{ | |
4988 | + struct inode *h_inode; | |
4989 | + | |
4990 | + dt->dt_dentry = dentry; | |
4991 | + dt->dt_h_path = *h_path; | |
5527c038 | 4992 | + h_inode = d_inode(h_path->dentry); |
1facf9fc | 4993 | + dt->dt_atime = h_inode->i_atime; |
4994 | + dt->dt_mtime = h_inode->i_mtime; | |
4995 | + /* smp_mb(); */ | |
4996 | +} | |
4997 | + | |
4998 | +void au_dtime_revert(struct au_dtime *dt) | |
4999 | +{ | |
5000 | + struct iattr attr; | |
5001 | + int err; | |
5002 | + | |
5003 | + attr.ia_atime = dt->dt_atime; | |
5004 | + attr.ia_mtime = dt->dt_mtime; | |
5005 | + attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET | |
5006 | + | ATTR_ATIME | ATTR_ATIME_SET; | |
5007 | + | |
523b37e3 AM |
5008 | + /* no delegation since this is a directory */ |
5009 | + err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL); | |
1facf9fc | 5010 | + if (unlikely(err)) |
0c3ec466 | 5011 | + pr_warn("restoring timestamps failed(%d). ignored\n", err); |
1facf9fc | 5012 | +} |
5013 | + | |
5014 | +/* ---------------------------------------------------------------------- */ | |
5015 | + | |
86dc4139 AM |
5016 | +/* internal use only */ |
5017 | +struct au_cpup_reg_attr { | |
5018 | + int valid; | |
5019 | + struct kstat st; | |
5020 | + unsigned int iflags; /* inode->i_flags */ | |
5021 | +}; | |
5022 | + | |
1facf9fc | 5023 | +static noinline_for_stack |
86dc4139 AM |
5024 | +int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src, |
5025 | + struct au_cpup_reg_attr *h_src_attr) | |
1facf9fc | 5026 | +{ |
c1595e42 | 5027 | + int err, sbits, icex; |
7e9cd9fe AM |
5028 | + unsigned int mnt_flags; |
5029 | + unsigned char verbose; | |
1facf9fc | 5030 | + struct iattr ia; |
5031 | + struct path h_path; | |
1308ab2a | 5032 | + struct inode *h_isrc, *h_idst; |
86dc4139 | 5033 | + struct kstat *h_st; |
c1595e42 | 5034 | + struct au_branch *br; |
1facf9fc | 5035 | + |
5036 | + h_path.dentry = au_h_dptr(dst, bindex); | |
5527c038 | 5037 | + h_idst = d_inode(h_path.dentry); |
c1595e42 JR |
5038 | + br = au_sbr(dst->d_sb, bindex); |
5039 | + h_path.mnt = au_br_mnt(br); | |
5527c038 | 5040 | + h_isrc = d_inode(h_src); |
1308ab2a | 5041 | + ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID |
1facf9fc | 5042 | + | ATTR_ATIME | ATTR_MTIME |
5043 | + | ATTR_ATIME_SET | ATTR_MTIME_SET; | |
86dc4139 AM |
5044 | + if (h_src_attr && h_src_attr->valid) { |
5045 | + h_st = &h_src_attr->st; | |
5046 | + ia.ia_uid = h_st->uid; | |
5047 | + ia.ia_gid = h_st->gid; | |
5048 | + ia.ia_atime = h_st->atime; | |
5049 | + ia.ia_mtime = h_st->mtime; | |
5050 | + if (h_idst->i_mode != h_st->mode | |
5051 | + && !S_ISLNK(h_idst->i_mode)) { | |
5052 | + ia.ia_valid |= ATTR_MODE; | |
5053 | + ia.ia_mode = h_st->mode; | |
5054 | + } | |
5055 | + sbits = !!(h_st->mode & (S_ISUID | S_ISGID)); | |
5056 | + au_cpup_attr_flags(h_idst, h_src_attr->iflags); | |
5057 | + } else { | |
5058 | + ia.ia_uid = h_isrc->i_uid; | |
5059 | + ia.ia_gid = h_isrc->i_gid; | |
5060 | + ia.ia_atime = h_isrc->i_atime; | |
5061 | + ia.ia_mtime = h_isrc->i_mtime; | |
5062 | + if (h_idst->i_mode != h_isrc->i_mode | |
5063 | + && !S_ISLNK(h_idst->i_mode)) { | |
5064 | + ia.ia_valid |= ATTR_MODE; | |
5065 | + ia.ia_mode = h_isrc->i_mode; | |
5066 | + } | |
5067 | + sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); | |
5068 | + au_cpup_attr_flags(h_idst, h_isrc->i_flags); | |
1308ab2a | 5069 | + } |
523b37e3 AM |
5070 | + /* no delegation since it is just created */ |
5071 | + err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); | |
1facf9fc | 5072 | + |
5073 | + /* is this nfs only? */ | |
5074 | + if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { | |
5075 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
5076 | + ia.ia_mode = h_isrc->i_mode; | |
523b37e3 | 5077 | + err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); |
1facf9fc | 5078 | + } |
5079 | + | |
c1595e42 | 5080 | + icex = br->br_perm & AuBrAttr_ICEX; |
7e9cd9fe AM |
5081 | + if (!err) { |
5082 | + mnt_flags = au_mntflags(dst->d_sb); | |
5083 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
5084 | + err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose); | |
5085 | + } | |
c1595e42 | 5086 | + |
1facf9fc | 5087 | + return err; |
5088 | +} | |
5089 | + | |
5090 | +/* ---------------------------------------------------------------------- */ | |
5091 | + | |
5092 | +static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, | |
5093 | + char *buf, unsigned long blksize) | |
5094 | +{ | |
5095 | + int err; | |
5096 | + size_t sz, rbytes, wbytes; | |
5097 | + unsigned char all_zero; | |
5098 | + char *p, *zp; | |
febd17d6 | 5099 | + struct inode *h_inode; |
1facf9fc | 5100 | + /* reduce stack usage */ |
5101 | + struct iattr *ia; | |
5102 | + | |
5103 | + zp = page_address(ZERO_PAGE(0)); | |
5104 | + if (unlikely(!zp)) | |
5105 | + return -ENOMEM; /* possible? */ | |
5106 | + | |
5107 | + err = 0; | |
5108 | + all_zero = 0; | |
5109 | + while (len) { | |
5110 | + AuDbg("len %lld\n", len); | |
5111 | + sz = blksize; | |
5112 | + if (len < blksize) | |
5113 | + sz = len; | |
5114 | + | |
5115 | + rbytes = 0; | |
5116 | + /* todo: signal_pending? */ | |
5117 | + while (!rbytes || err == -EAGAIN || err == -EINTR) { | |
5118 | + rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); | |
5119 | + err = rbytes; | |
5120 | + } | |
5121 | + if (unlikely(err < 0)) | |
5122 | + break; | |
5123 | + | |
5124 | + all_zero = 0; | |
5125 | + if (len >= rbytes && rbytes == blksize) | |
5126 | + all_zero = !memcmp(buf, zp, rbytes); | |
5127 | + if (!all_zero) { | |
5128 | + wbytes = rbytes; | |
5129 | + p = buf; | |
5130 | + while (wbytes) { | |
5131 | + size_t b; | |
5132 | + | |
5133 | + b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); | |
5134 | + err = b; | |
5135 | + /* todo: signal_pending? */ | |
5136 | + if (unlikely(err == -EAGAIN || err == -EINTR)) | |
5137 | + continue; | |
5138 | + if (unlikely(err < 0)) | |
5139 | + break; | |
5140 | + wbytes -= b; | |
5141 | + p += b; | |
5142 | + } | |
392086de AM |
5143 | + if (unlikely(err < 0)) |
5144 | + break; | |
1facf9fc | 5145 | + } else { |
5146 | + loff_t res; | |
5147 | + | |
5148 | + AuLabel(hole); | |
5149 | + res = vfsub_llseek(dst, rbytes, SEEK_CUR); | |
5150 | + err = res; | |
5151 | + if (unlikely(res < 0)) | |
5152 | + break; | |
5153 | + } | |
5154 | + len -= rbytes; | |
5155 | + err = 0; | |
5156 | + } | |
5157 | + | |
5158 | + /* the last block may be a hole */ | |
5159 | + if (!err && all_zero) { | |
5160 | + AuLabel(last hole); | |
5161 | + | |
5162 | + err = 1; | |
2000de60 | 5163 | + if (au_test_nfs(dst->f_path.dentry->d_sb)) { |
1facf9fc | 5164 | + /* nfs requires this step to make last hole */ |
5165 | + /* is this only nfs? */ | |
5166 | + do { | |
5167 | + /* todo: signal_pending? */ | |
5168 | + err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); | |
5169 | + } while (err == -EAGAIN || err == -EINTR); | |
5170 | + if (err == 1) | |
5171 | + dst->f_pos--; | |
5172 | + } | |
5173 | + | |
5174 | + if (err == 1) { | |
5175 | + ia = (void *)buf; | |
5176 | + ia->ia_size = dst->f_pos; | |
5177 | + ia->ia_valid = ATTR_SIZE | ATTR_FILE; | |
5178 | + ia->ia_file = dst; | |
febd17d6 JR |
5179 | + h_inode = file_inode(dst); |
5180 | + inode_lock_nested(h_inode, AuLsc_I_CHILD2); | |
523b37e3 AM |
5181 | + /* no delegation since it is just created */ |
5182 | + err = vfsub_notify_change(&dst->f_path, ia, | |
5183 | + /*delegated*/NULL); | |
febd17d6 | 5184 | + inode_unlock(h_inode); |
1facf9fc | 5185 | + } |
5186 | + } | |
5187 | + | |
5188 | + return err; | |
5189 | +} | |
5190 | + | |
5191 | +int au_copy_file(struct file *dst, struct file *src, loff_t len) | |
5192 | +{ | |
5193 | + int err; | |
5194 | + unsigned long blksize; | |
5195 | + unsigned char do_kfree; | |
5196 | + char *buf; | |
9f237c51 | 5197 | + struct super_block *h_sb; |
1facf9fc | 5198 | + |
5199 | + err = -ENOMEM; | |
9f237c51 AM |
5200 | + h_sb = file_inode(dst)->i_sb; |
5201 | + blksize = h_sb->s_blocksize; | |
1facf9fc | 5202 | + if (!blksize || PAGE_SIZE < blksize) |
5203 | + blksize = PAGE_SIZE; | |
5204 | + AuDbg("blksize %lu\n", blksize); | |
5205 | + do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); | |
5206 | + if (do_kfree) | |
5207 | + buf = kmalloc(blksize, GFP_NOFS); | |
5208 | + else | |
5209 | + buf = (void *)__get_free_page(GFP_NOFS); | |
5210 | + if (unlikely(!buf)) | |
5211 | + goto out; | |
5212 | + | |
5213 | + if (len > (1 << 22)) | |
5214 | + AuDbg("copying a large file %lld\n", (long long)len); | |
5215 | + | |
5216 | + src->f_pos = 0; | |
5217 | + dst->f_pos = 0; | |
5218 | + err = au_do_copy_file(dst, src, len, buf, blksize); | |
9f237c51 AM |
5219 | + if (do_kfree) { |
5220 | + AuDebugOn(!au_kfree_do_sz_test(blksize)); | |
5221 | + au_kfree_do_rcu(buf); | |
5222 | + } else | |
1c60b727 | 5223 | + free_page((unsigned long)buf); |
1facf9fc | 5224 | + |
4f0767ce | 5225 | +out: |
1facf9fc | 5226 | + return err; |
5227 | +} | |
5228 | + | |
1c60b727 AM |
5229 | +static int au_do_copy(struct file *dst, struct file *src, loff_t len) |
5230 | +{ | |
5231 | + int err; | |
5232 | + struct super_block *h_src_sb; | |
5233 | + struct inode *h_src_inode; | |
5234 | + | |
5235 | + h_src_inode = file_inode(src); | |
5236 | + h_src_sb = h_src_inode->i_sb; | |
5237 | + | |
5238 | + /* XFS acquires inode_lock */ | |
5239 | + if (!au_test_xfs(h_src_sb)) | |
5240 | + err = au_copy_file(dst, src, len); | |
5241 | + else { | |
3c1bdaff | 5242 | + inode_unlock_shared(h_src_inode); |
1c60b727 | 5243 | + err = au_copy_file(dst, src, len); |
be118d29 | 5244 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
1c60b727 AM |
5245 | + } |
5246 | + | |
5247 | + return err; | |
5248 | +} | |
5249 | + | |
5250 | +static int au_clone_or_copy(struct file *dst, struct file *src, loff_t len) | |
5251 | +{ | |
5252 | + int err; | |
9f237c51 | 5253 | + loff_t lo; |
1c60b727 AM |
5254 | + struct super_block *h_src_sb; |
5255 | + struct inode *h_src_inode; | |
5256 | + | |
5257 | + h_src_inode = file_inode(src); | |
5258 | + h_src_sb = h_src_inode->i_sb; | |
5259 | + if (h_src_sb != file_inode(dst)->i_sb | |
9f237c51 | 5260 | + || !dst->f_op->remap_file_range) { |
1c60b727 AM |
5261 | + err = au_do_copy(dst, src, len); |
5262 | + goto out; | |
5263 | + } | |
5264 | + | |
5265 | + if (!au_test_nfs(h_src_sb)) { | |
3c1bdaff | 5266 | + inode_unlock_shared(h_src_inode); |
9f237c51 | 5267 | + lo = vfsub_clone_file_range(src, dst, len); |
be118d29 | 5268 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
1c60b727 | 5269 | + } else |
9f237c51 AM |
5270 | + lo = vfsub_clone_file_range(src, dst, len); |
5271 | + if (lo == len) { | |
5272 | + err = 0; | |
5273 | + goto out; /* success */ | |
5274 | + } else if (lo >= 0) | |
5275 | + /* todo: possible? */ | |
5276 | + /* paritially succeeded */ | |
5277 | + AuDbg("lo %lld, len %lld. Retrying.\n", lo, len); | |
5278 | + else if (lo != -EOPNOTSUPP) { | |
5279 | + /* older XFS has a condition in cloning */ | |
5280 | + err = lo; | |
1c60b727 | 5281 | + goto out; |
9f237c51 | 5282 | + } |
1c60b727 AM |
5283 | + |
5284 | + /* the backend fs on NFS may not support cloning */ | |
5285 | + err = au_do_copy(dst, src, len); | |
5286 | + | |
5287 | +out: | |
5288 | + AuTraceErr(err); | |
5289 | + return err; | |
5290 | +} | |
5291 | + | |
1facf9fc | 5292 | +/* |
5293 | + * to support a sparse file which is opened with O_APPEND, | |
5294 | + * we need to close the file. | |
5295 | + */ | |
c2b27bf2 | 5296 | +static int au_cp_regular(struct au_cp_generic *cpg) |
1facf9fc | 5297 | +{ |
5298 | + int err, i; | |
5299 | + enum { SRC, DST }; | |
5300 | + struct { | |
5301 | + aufs_bindex_t bindex; | |
5302 | + unsigned int flags; | |
5303 | + struct dentry *dentry; | |
392086de | 5304 | + int force_wr; |
1facf9fc | 5305 | + struct file *file; |
1facf9fc | 5306 | + } *f, file[] = { |
5307 | + { | |
c2b27bf2 | 5308 | + .bindex = cpg->bsrc, |
1facf9fc | 5309 | + .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, |
1facf9fc | 5310 | + }, |
5311 | + { | |
c2b27bf2 | 5312 | + .bindex = cpg->bdst, |
1facf9fc | 5313 | + .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, |
392086de | 5314 | + .force_wr = !!au_ftest_cpup(cpg->flags, RWDST), |
1facf9fc | 5315 | + } |
5316 | + }; | |
acd2b654 | 5317 | + struct au_branch *br; |
521ced18 | 5318 | + struct super_block *sb, *h_src_sb; |
e2f27e51 | 5319 | + struct inode *h_src_inode; |
8cdd5066 | 5320 | + struct task_struct *tsk = current; |
1facf9fc | 5321 | + |
5322 | + /* bsrc branch can be ro/rw. */ | |
c2b27bf2 | 5323 | + sb = cpg->dentry->d_sb; |
1facf9fc | 5324 | + f = file; |
5325 | + for (i = 0; i < 2; i++, f++) { | |
c2b27bf2 AM |
5326 | + f->dentry = au_h_dptr(cpg->dentry, f->bindex); |
5327 | + f->file = au_h_open(cpg->dentry, f->bindex, f->flags, | |
392086de | 5328 | + /*file*/NULL, f->force_wr); |
9f237c51 AM |
5329 | + if (IS_ERR(f->file)) { |
5330 | + err = PTR_ERR(f->file); | |
5331 | + if (i == SRC) | |
5332 | + goto out; | |
5333 | + else | |
5334 | + goto out_src; | |
5335 | + } | |
1facf9fc | 5336 | + } |
5337 | + | |
5338 | + /* try stopping to update while we copyup */ | |
e2f27e51 | 5339 | + h_src_inode = d_inode(file[SRC].dentry); |
521ced18 JR |
5340 | + h_src_sb = h_src_inode->i_sb; |
5341 | + if (!au_test_nfs(h_src_sb)) | |
e2f27e51 | 5342 | + IMustLock(h_src_inode); |
1c60b727 | 5343 | + err = au_clone_or_copy(file[DST].file, file[SRC].file, cpg->len); |
1facf9fc | 5344 | + |
8cdd5066 JR |
5345 | + /* i wonder if we had O_NO_DELAY_FPUT flag */ |
5346 | + if (tsk->flags & PF_KTHREAD) | |
5347 | + __fput_sync(file[DST].file); | |
5348 | + else { | |
062440b3 | 5349 | + /* it happened actually */ |
8cdd5066 JR |
5350 | + fput(file[DST].file); |
5351 | + /* | |
5352 | + * too bad. | |
5353 | + * we have to call both since we don't know which place the file | |
5354 | + * was added to. | |
5355 | + */ | |
5356 | + task_work_run(); | |
5357 | + flush_delayed_fput(); | |
5358 | + } | |
acd2b654 AM |
5359 | + br = au_sbr(sb, file[DST].bindex); |
5360 | + au_lcnt_dec(&br->br_nfiles); | |
523b37e3 | 5361 | + |
4f0767ce | 5362 | +out_src: |
1facf9fc | 5363 | + fput(file[SRC].file); |
acd2b654 AM |
5364 | + br = au_sbr(sb, file[SRC].bindex); |
5365 | + au_lcnt_dec(&br->br_nfiles); | |
4f0767ce | 5366 | +out: |
1facf9fc | 5367 | + return err; |
5368 | +} | |
5369 | + | |
c2b27bf2 | 5370 | +static int au_do_cpup_regular(struct au_cp_generic *cpg, |
86dc4139 | 5371 | + struct au_cpup_reg_attr *h_src_attr) |
1facf9fc | 5372 | +{ |
5373 | + int err, rerr; | |
5374 | + loff_t l; | |
86dc4139 | 5375 | + struct path h_path; |
38d290e6 | 5376 | + struct inode *h_src_inode, *h_dst_inode; |
1facf9fc | 5377 | + |
5378 | + err = 0; | |
5527c038 | 5379 | + h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc); |
86dc4139 | 5380 | + l = i_size_read(h_src_inode); |
c2b27bf2 AM |
5381 | + if (cpg->len == -1 || l < cpg->len) |
5382 | + cpg->len = l; | |
5383 | + if (cpg->len) { | |
86dc4139 | 5384 | + /* try stopping to update while we are referencing */ |
be118d29 | 5385 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
c2b27bf2 | 5386 | + au_pin_hdir_unlock(cpg->pin); |
1facf9fc | 5387 | + |
c2b27bf2 AM |
5388 | + h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc); |
5389 | + h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc); | |
86dc4139 | 5390 | + h_src_attr->iflags = h_src_inode->i_flags; |
5527c038 | 5391 | + if (!au_test_nfs(h_src_inode->i_sb)) |
521ced18 | 5392 | + err = vfsub_getattr(&h_path, &h_src_attr->st); |
5527c038 | 5393 | + else { |
3c1bdaff | 5394 | + inode_unlock_shared(h_src_inode); |
521ced18 | 5395 | + err = vfsub_getattr(&h_path, &h_src_attr->st); |
be118d29 | 5396 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
5527c038 | 5397 | + } |
86dc4139 | 5398 | + if (unlikely(err)) { |
3c1bdaff | 5399 | + inode_unlock_shared(h_src_inode); |
86dc4139 AM |
5400 | + goto out; |
5401 | + } | |
5402 | + h_src_attr->valid = 1; | |
e2f27e51 AM |
5403 | + if (!au_test_nfs(h_src_inode->i_sb)) { |
5404 | + err = au_cp_regular(cpg); | |
3c1bdaff | 5405 | + inode_unlock_shared(h_src_inode); |
e2f27e51 | 5406 | + } else { |
3c1bdaff | 5407 | + inode_unlock_shared(h_src_inode); |
e2f27e51 AM |
5408 | + err = au_cp_regular(cpg); |
5409 | + } | |
c2b27bf2 | 5410 | + rerr = au_pin_hdir_relock(cpg->pin); |
86dc4139 AM |
5411 | + if (!err && rerr) |
5412 | + err = rerr; | |
1facf9fc | 5413 | + } |
38d290e6 JR |
5414 | + if (!err && (h_src_inode->i_state & I_LINKABLE)) { |
5415 | + h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst); | |
5527c038 | 5416 | + h_dst_inode = d_inode(h_path.dentry); |
38d290e6 JR |
5417 | + spin_lock(&h_dst_inode->i_lock); |
5418 | + h_dst_inode->i_state |= I_LINKABLE; | |
5419 | + spin_unlock(&h_dst_inode->i_lock); | |
5420 | + } | |
1facf9fc | 5421 | + |
4f0767ce | 5422 | +out: |
1facf9fc | 5423 | + return err; |
5424 | +} | |
5425 | + | |
5426 | +static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, | |
5427 | + struct inode *h_dir) | |
5428 | +{ | |
5429 | + int err, symlen; | |
5430 | + mm_segment_t old_fs; | |
b752ccd1 AM |
5431 | + union { |
5432 | + char *k; | |
5433 | + char __user *u; | |
5434 | + } sym; | |
1facf9fc | 5435 | + |
5436 | + err = -ENOMEM; | |
537831f9 | 5437 | + sym.k = (void *)__get_free_page(GFP_NOFS); |
b752ccd1 | 5438 | + if (unlikely(!sym.k)) |
1facf9fc | 5439 | + goto out; |
5440 | + | |
9dbd164d | 5441 | + /* unnecessary to support mmap_sem since symlink is not mmap-able */ |
1facf9fc | 5442 | + old_fs = get_fs(); |
5443 | + set_fs(KERNEL_DS); | |
a2654f78 | 5444 | + symlen = vfs_readlink(h_src, sym.u, PATH_MAX); |
1facf9fc | 5445 | + err = symlen; |
5446 | + set_fs(old_fs); | |
5447 | + | |
5448 | + if (symlen > 0) { | |
b752ccd1 AM |
5449 | + sym.k[symlen] = 0; |
5450 | + err = vfsub_symlink(h_dir, h_path, sym.k); | |
1facf9fc | 5451 | + } |
1c60b727 | 5452 | + free_page((unsigned long)sym.k); |
1facf9fc | 5453 | + |
4f0767ce | 5454 | +out: |
1facf9fc | 5455 | + return err; |
5456 | +} | |
5457 | + | |
8cdd5066 JR |
5458 | +/* |
5459 | + * regardless 'acl' option, reset all ACL. | |
5460 | + * All ACL will be copied up later from the original entry on the lower branch. | |
5461 | + */ | |
5462 | +static int au_reset_acl(struct inode *h_dir, struct path *h_path, umode_t mode) | |
5463 | +{ | |
5464 | + int err; | |
5465 | + struct dentry *h_dentry; | |
5466 | + struct inode *h_inode; | |
5467 | + | |
5468 | + h_dentry = h_path->dentry; | |
5469 | + h_inode = d_inode(h_dentry); | |
5470 | + /* forget_all_cached_acls(h_inode)); */ | |
5471 | + err = vfsub_removexattr(h_dentry, XATTR_NAME_POSIX_ACL_ACCESS); | |
5472 | + AuTraceErr(err); | |
5473 | + if (err == -EOPNOTSUPP) | |
5474 | + err = 0; | |
5475 | + if (!err) | |
5476 | + err = vfsub_acl_chmod(h_inode, mode); | |
5477 | + | |
5478 | + AuTraceErr(err); | |
5479 | + return err; | |
5480 | +} | |
5481 | + | |
5482 | +static int au_do_cpup_dir(struct au_cp_generic *cpg, struct dentry *dst_parent, | |
5483 | + struct inode *h_dir, struct path *h_path) | |
5484 | +{ | |
5485 | + int err; | |
5486 | + struct inode *dir, *inode; | |
5487 | + | |
5488 | + err = vfsub_removexattr(h_path->dentry, XATTR_NAME_POSIX_ACL_DEFAULT); | |
5489 | + AuTraceErr(err); | |
5490 | + if (err == -EOPNOTSUPP) | |
5491 | + err = 0; | |
5492 | + if (unlikely(err)) | |
5493 | + goto out; | |
5494 | + | |
5495 | + /* | |
5496 | + * strange behaviour from the users view, | |
acd2b654 | 5497 | + * particularly setattr case |
8cdd5066 JR |
5498 | + */ |
5499 | + dir = d_inode(dst_parent); | |
5afbbe0d | 5500 | + if (au_ibtop(dir) == cpg->bdst) |
8cdd5066 JR |
5501 | + au_cpup_attr_nlink(dir, /*force*/1); |
5502 | + inode = d_inode(cpg->dentry); | |
5503 | + au_cpup_attr_nlink(inode, /*force*/1); | |
5504 | + | |
5505 | +out: | |
5506 | + return err; | |
5507 | +} | |
5508 | + | |
1facf9fc | 5509 | +static noinline_for_stack |
c2b27bf2 | 5510 | +int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent, |
86dc4139 | 5511 | + struct au_cpup_reg_attr *h_src_attr) |
1facf9fc | 5512 | +{ |
5513 | + int err; | |
5514 | + umode_t mode; | |
5515 | + unsigned int mnt_flags; | |
076b876e | 5516 | + unsigned char isdir, isreg, force; |
c2b27bf2 | 5517 | + const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME); |
1facf9fc | 5518 | + struct au_dtime dt; |
5519 | + struct path h_path; | |
5520 | + struct dentry *h_src, *h_dst, *h_parent; | |
8cdd5066 | 5521 | + struct inode *h_inode, *h_dir; |
1facf9fc | 5522 | + struct super_block *sb; |
5523 | + | |
5524 | + /* bsrc branch can be ro/rw. */ | |
c2b27bf2 | 5525 | + h_src = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 JR |
5526 | + h_inode = d_inode(h_src); |
5527 | + AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc)); | |
1facf9fc | 5528 | + |
5529 | + /* try stopping to be referenced while we are creating */ | |
c2b27bf2 AM |
5530 | + h_dst = au_h_dptr(cpg->dentry, cpg->bdst); |
5531 | + if (au_ftest_cpup(cpg->flags, RENAME)) | |
86dc4139 AM |
5532 | + AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX, |
5533 | + AUFS_WH_PFX_LEN)); | |
1facf9fc | 5534 | + h_parent = h_dst->d_parent; /* dir inode is locked */ |
5527c038 | 5535 | + h_dir = d_inode(h_parent); |
1facf9fc | 5536 | + IMustLock(h_dir); |
5537 | + AuDebugOn(h_parent != h_dst->d_parent); | |
5538 | + | |
c2b27bf2 AM |
5539 | + sb = cpg->dentry->d_sb; |
5540 | + h_path.mnt = au_sbr_mnt(sb, cpg->bdst); | |
1facf9fc | 5541 | + if (do_dt) { |
5542 | + h_path.dentry = h_parent; | |
5543 | + au_dtime_store(&dt, dst_parent, &h_path); | |
5544 | + } | |
5545 | + h_path.dentry = h_dst; | |
5546 | + | |
076b876e | 5547 | + isreg = 0; |
1facf9fc | 5548 | + isdir = 0; |
5549 | + mode = h_inode->i_mode; | |
5550 | + switch (mode & S_IFMT) { | |
5551 | + case S_IFREG: | |
076b876e | 5552 | + isreg = 1; |
cd7a4cd9 | 5553 | + err = vfsub_create(h_dir, &h_path, 0600, /*want_excl*/true); |
1facf9fc | 5554 | + if (!err) |
c2b27bf2 | 5555 | + err = au_do_cpup_regular(cpg, h_src_attr); |
1facf9fc | 5556 | + break; |
5557 | + case S_IFDIR: | |
5558 | + isdir = 1; | |
5559 | + err = vfsub_mkdir(h_dir, &h_path, mode); | |
8cdd5066 JR |
5560 | + if (!err) |
5561 | + err = au_do_cpup_dir(cpg, dst_parent, h_dir, &h_path); | |
1facf9fc | 5562 | + break; |
5563 | + case S_IFLNK: | |
5564 | + err = au_do_cpup_symlink(&h_path, h_src, h_dir); | |
5565 | + break; | |
5566 | + case S_IFCHR: | |
5567 | + case S_IFBLK: | |
5568 | + AuDebugOn(!capable(CAP_MKNOD)); | |
5569 | + /*FALLTHROUGH*/ | |
5570 | + case S_IFIFO: | |
5571 | + case S_IFSOCK: | |
5572 | + err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); | |
5573 | + break; | |
5574 | + default: | |
5575 | + AuIOErr("Unknown inode type 0%o\n", mode); | |
5576 | + err = -EIO; | |
5577 | + } | |
8cdd5066 JR |
5578 | + if (!err) |
5579 | + err = au_reset_acl(h_dir, &h_path, mode); | |
1facf9fc | 5580 | + |
5581 | + mnt_flags = au_mntflags(sb); | |
5582 | + if (!au_opt_test(mnt_flags, UDBA_NONE) | |
5583 | + && !isdir | |
5584 | + && au_opt_test(mnt_flags, XINO) | |
38d290e6 JR |
5585 | + && (h_inode->i_nlink == 1 |
5586 | + || (h_inode->i_state & I_LINKABLE)) | |
1facf9fc | 5587 | + /* todo: unnecessary? */ |
5527c038 | 5588 | + /* && d_inode(cpg->dentry)->i_nlink == 1 */ |
c2b27bf2 AM |
5589 | + && cpg->bdst < cpg->bsrc |
5590 | + && !au_ftest_cpup(cpg->flags, KEEPLINO)) | |
5591 | + au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0); | |
1facf9fc | 5592 | + /* ignore this error */ |
5593 | + | |
076b876e AM |
5594 | + if (!err) { |
5595 | + force = 0; | |
5596 | + if (isreg) { | |
5597 | + force = !!cpg->len; | |
5598 | + if (cpg->len == -1) | |
5599 | + force = !!i_size_read(h_inode); | |
5600 | + } | |
5601 | + au_fhsm_wrote(sb, cpg->bdst, force); | |
5602 | + } | |
5603 | + | |
1facf9fc | 5604 | + if (do_dt) |
5605 | + au_dtime_revert(&dt); | |
5606 | + return err; | |
5607 | +} | |
5608 | + | |
392086de | 5609 | +static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path) |
86dc4139 AM |
5610 | +{ |
5611 | + int err; | |
392086de | 5612 | + struct dentry *dentry, *h_dentry, *h_parent, *parent; |
86dc4139 | 5613 | + struct inode *h_dir; |
392086de | 5614 | + aufs_bindex_t bdst; |
86dc4139 | 5615 | + |
392086de AM |
5616 | + dentry = cpg->dentry; |
5617 | + bdst = cpg->bdst; | |
5618 | + h_dentry = au_h_dptr(dentry, bdst); | |
5619 | + if (!au_ftest_cpup(cpg->flags, OVERWRITE)) { | |
5620 | + dget(h_dentry); | |
5621 | + au_set_h_dptr(dentry, bdst, NULL); | |
5622 | + err = au_lkup_neg(dentry, bdst, /*wh*/0); | |
5623 | + if (!err) | |
5624 | + h_path->dentry = dget(au_h_dptr(dentry, bdst)); | |
86dc4139 | 5625 | + au_set_h_dptr(dentry, bdst, h_dentry); |
392086de AM |
5626 | + } else { |
5627 | + err = 0; | |
5628 | + parent = dget_parent(dentry); | |
5629 | + h_parent = au_h_dptr(parent, bdst); | |
5630 | + dput(parent); | |
5631 | + h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent); | |
5632 | + if (IS_ERR(h_path->dentry)) | |
5633 | + err = PTR_ERR(h_path->dentry); | |
86dc4139 | 5634 | + } |
392086de AM |
5635 | + if (unlikely(err)) |
5636 | + goto out; | |
86dc4139 | 5637 | + |
86dc4139 | 5638 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ |
5527c038 | 5639 | + h_dir = d_inode(h_parent); |
86dc4139 | 5640 | + IMustLock(h_dir); |
523b37e3 AM |
5641 | + AuDbg("%pd %pd\n", h_dentry, h_path->dentry); |
5642 | + /* no delegation since it is just created */ | |
f2c43d5f AM |
5643 | + err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL, |
5644 | + /*flags*/0); | |
86dc4139 AM |
5645 | + dput(h_path->dentry); |
5646 | + | |
5647 | +out: | |
5648 | + return err; | |
5649 | +} | |
5650 | + | |
1facf9fc | 5651 | +/* |
5652 | + * copyup the @dentry from @bsrc to @bdst. | |
5653 | + * the caller must set the both of lower dentries. | |
5654 | + * @len is for truncating when it is -1 copyup the entire file. | |
5655 | + * in link/rename cases, @dst_parent may be different from the real one. | |
c2b27bf2 | 5656 | + * basic->bsrc can be larger than basic->bdst. |
f2c43d5f | 5657 | + * aufs doesn't touch the credential so |
acd2b654 | 5658 | + * security_inode_copy_up{,_xattr}() are unnecessary. |
1facf9fc | 5659 | + */ |
c2b27bf2 | 5660 | +static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) |
1facf9fc | 5661 | +{ |
5662 | + int err, rerr; | |
5afbbe0d | 5663 | + aufs_bindex_t old_ibtop; |
1facf9fc | 5664 | + unsigned char isdir, plink; |
1facf9fc | 5665 | + struct dentry *h_src, *h_dst, *h_parent; |
5527c038 | 5666 | + struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode; |
1facf9fc | 5667 | + struct super_block *sb; |
86dc4139 | 5668 | + struct au_branch *br; |
acd2b654 | 5669 | + /* to reduce stack size */ |
c2b27bf2 AM |
5670 | + struct { |
5671 | + struct au_dtime dt; | |
5672 | + struct path h_path; | |
5673 | + struct au_cpup_reg_attr h_src_attr; | |
5674 | + } *a; | |
1facf9fc | 5675 | + |
c2b27bf2 AM |
5676 | + err = -ENOMEM; |
5677 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
5678 | + if (unlikely(!a)) | |
5679 | + goto out; | |
5680 | + a->h_src_attr.valid = 0; | |
1facf9fc | 5681 | + |
c2b27bf2 AM |
5682 | + sb = cpg->dentry->d_sb; |
5683 | + br = au_sbr(sb, cpg->bdst); | |
5684 | + a->h_path.mnt = au_br_mnt(br); | |
5685 | + h_dst = au_h_dptr(cpg->dentry, cpg->bdst); | |
1facf9fc | 5686 | + h_parent = h_dst->d_parent; /* dir inode is locked */ |
5527c038 | 5687 | + h_dir = d_inode(h_parent); |
1facf9fc | 5688 | + IMustLock(h_dir); |
5689 | + | |
c2b27bf2 | 5690 | + h_src = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 | 5691 | + inode = d_inode(cpg->dentry); |
1facf9fc | 5692 | + |
5693 | + if (!dst_parent) | |
c2b27bf2 | 5694 | + dst_parent = dget_parent(cpg->dentry); |
1facf9fc | 5695 | + else |
5696 | + dget(dst_parent); | |
5697 | + | |
5698 | + plink = !!au_opt_test(au_mntflags(sb), PLINK); | |
c2b27bf2 | 5699 | + dst_inode = au_h_iptr(inode, cpg->bdst); |
1facf9fc | 5700 | + if (dst_inode) { |
5701 | + if (unlikely(!plink)) { | |
5702 | + err = -EIO; | |
027c5e7a AM |
5703 | + AuIOErr("hi%lu(i%lu) exists on b%d " |
5704 | + "but plink is disabled\n", | |
c2b27bf2 AM |
5705 | + dst_inode->i_ino, inode->i_ino, cpg->bdst); |
5706 | + goto out_parent; | |
1facf9fc | 5707 | + } |
5708 | + | |
5709 | + if (dst_inode->i_nlink) { | |
c2b27bf2 | 5710 | + const int do_dt = au_ftest_cpup(cpg->flags, DTIME); |
1facf9fc | 5711 | + |
c2b27bf2 | 5712 | + h_src = au_plink_lkup(inode, cpg->bdst); |
1facf9fc | 5713 | + err = PTR_ERR(h_src); |
5714 | + if (IS_ERR(h_src)) | |
c2b27bf2 | 5715 | + goto out_parent; |
5527c038 | 5716 | + if (unlikely(d_is_negative(h_src))) { |
1facf9fc | 5717 | + err = -EIO; |
79b8bda9 | 5718 | + AuIOErr("i%lu exists on b%d " |
027c5e7a | 5719 | + "but not pseudo-linked\n", |
79b8bda9 | 5720 | + inode->i_ino, cpg->bdst); |
1facf9fc | 5721 | + dput(h_src); |
c2b27bf2 | 5722 | + goto out_parent; |
1facf9fc | 5723 | + } |
5724 | + | |
5725 | + if (do_dt) { | |
c2b27bf2 AM |
5726 | + a->h_path.dentry = h_parent; |
5727 | + au_dtime_store(&a->dt, dst_parent, &a->h_path); | |
1facf9fc | 5728 | + } |
86dc4139 | 5729 | + |
c2b27bf2 | 5730 | + a->h_path.dentry = h_dst; |
523b37e3 AM |
5731 | + delegated = NULL; |
5732 | + err = vfsub_link(h_src, h_dir, &a->h_path, &delegated); | |
c2b27bf2 | 5733 | + if (!err && au_ftest_cpup(cpg->flags, RENAME)) |
392086de | 5734 | + err = au_do_ren_after_cpup(cpg, &a->h_path); |
1facf9fc | 5735 | + if (do_dt) |
c2b27bf2 | 5736 | + au_dtime_revert(&a->dt); |
523b37e3 AM |
5737 | + if (unlikely(err == -EWOULDBLOCK)) { |
5738 | + pr_warn("cannot retry for NFSv4 delegation" | |
5739 | + " for an internal link\n"); | |
5740 | + iput(delegated); | |
5741 | + } | |
1facf9fc | 5742 | + dput(h_src); |
c2b27bf2 | 5743 | + goto out_parent; |
1facf9fc | 5744 | + } else |
5745 | + /* todo: cpup_wh_file? */ | |
5746 | + /* udba work */ | |
4a4d8108 | 5747 | + au_update_ibrange(inode, /*do_put_zero*/1); |
1facf9fc | 5748 | + } |
5749 | + | |
86dc4139 | 5750 | + isdir = S_ISDIR(inode->i_mode); |
5afbbe0d | 5751 | + old_ibtop = au_ibtop(inode); |
c2b27bf2 | 5752 | + err = cpup_entry(cpg, dst_parent, &a->h_src_attr); |
1facf9fc | 5753 | + if (unlikely(err)) |
86dc4139 | 5754 | + goto out_rev; |
5527c038 | 5755 | + dst_inode = d_inode(h_dst); |
febd17d6 | 5756 | + inode_lock_nested(dst_inode, AuLsc_I_CHILD2); |
86dc4139 | 5757 | + /* todo: necessary? */ |
c2b27bf2 | 5758 | + /* au_pin_hdir_unlock(cpg->pin); */ |
1facf9fc | 5759 | + |
c2b27bf2 | 5760 | + err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr); |
86dc4139 AM |
5761 | + if (unlikely(err)) { |
5762 | + /* todo: necessary? */ | |
c2b27bf2 | 5763 | + /* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */ |
febd17d6 | 5764 | + inode_unlock(dst_inode); |
86dc4139 AM |
5765 | + goto out_rev; |
5766 | + } | |
5767 | + | |
5afbbe0d | 5768 | + if (cpg->bdst < old_ibtop) { |
86dc4139 | 5769 | + if (S_ISREG(inode->i_mode)) { |
c2b27bf2 | 5770 | + err = au_dy_iaop(inode, cpg->bdst, dst_inode); |
86dc4139 | 5771 | + if (unlikely(err)) { |
c2b27bf2 AM |
5772 | + /* ignore an error */ |
5773 | + /* au_pin_hdir_relock(cpg->pin); */ | |
febd17d6 | 5774 | + inode_unlock(dst_inode); |
86dc4139 | 5775 | + goto out_rev; |
4a4d8108 | 5776 | + } |
4a4d8108 | 5777 | + } |
5afbbe0d | 5778 | + au_set_ibtop(inode, cpg->bdst); |
c2b27bf2 | 5779 | + } else |
5afbbe0d | 5780 | + au_set_ibbot(inode, cpg->bdst); |
c2b27bf2 | 5781 | + au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode), |
86dc4139 AM |
5782 | + au_hi_flags(inode, isdir)); |
5783 | + | |
5784 | + /* todo: necessary? */ | |
c2b27bf2 | 5785 | + /* err = au_pin_hdir_relock(cpg->pin); */ |
febd17d6 | 5786 | + inode_unlock(dst_inode); |
86dc4139 AM |
5787 | + if (unlikely(err)) |
5788 | + goto out_rev; | |
5789 | + | |
5527c038 | 5790 | + src_inode = d_inode(h_src); |
86dc4139 | 5791 | + if (!isdir |
5527c038 JR |
5792 | + && (src_inode->i_nlink > 1 |
5793 | + || src_inode->i_state & I_LINKABLE) | |
86dc4139 | 5794 | + && plink) |
c2b27bf2 | 5795 | + au_plink_append(inode, cpg->bdst, h_dst); |
86dc4139 | 5796 | + |
c2b27bf2 AM |
5797 | + if (au_ftest_cpup(cpg->flags, RENAME)) { |
5798 | + a->h_path.dentry = h_dst; | |
392086de | 5799 | + err = au_do_ren_after_cpup(cpg, &a->h_path); |
86dc4139 AM |
5800 | + } |
5801 | + if (!err) | |
c2b27bf2 | 5802 | + goto out_parent; /* success */ |
1facf9fc | 5803 | + |
5804 | + /* revert */ | |
4a4d8108 | 5805 | +out_rev: |
c2b27bf2 AM |
5806 | + a->h_path.dentry = h_parent; |
5807 | + au_dtime_store(&a->dt, dst_parent, &a->h_path); | |
5808 | + a->h_path.dentry = h_dst; | |
86dc4139 | 5809 | + rerr = 0; |
5527c038 | 5810 | + if (d_is_positive(h_dst)) { |
523b37e3 AM |
5811 | + if (!isdir) { |
5812 | + /* no delegation since it is just created */ | |
5813 | + rerr = vfsub_unlink(h_dir, &a->h_path, | |
5814 | + /*delegated*/NULL, /*force*/0); | |
5815 | + } else | |
c2b27bf2 | 5816 | + rerr = vfsub_rmdir(h_dir, &a->h_path); |
86dc4139 | 5817 | + } |
c2b27bf2 | 5818 | + au_dtime_revert(&a->dt); |
1facf9fc | 5819 | + if (rerr) { |
5820 | + AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); | |
5821 | + err = -EIO; | |
5822 | + } | |
c2b27bf2 | 5823 | +out_parent: |
1facf9fc | 5824 | + dput(dst_parent); |
9f237c51 | 5825 | + au_kfree_rcu(a); |
c2b27bf2 | 5826 | +out: |
1facf9fc | 5827 | + return err; |
5828 | +} | |
5829 | + | |
7e9cd9fe | 5830 | +#if 0 /* reserved */ |
1facf9fc | 5831 | +struct au_cpup_single_args { |
5832 | + int *errp; | |
c2b27bf2 | 5833 | + struct au_cp_generic *cpg; |
1facf9fc | 5834 | + struct dentry *dst_parent; |
5835 | +}; | |
5836 | + | |
5837 | +static void au_call_cpup_single(void *args) | |
5838 | +{ | |
5839 | + struct au_cpup_single_args *a = args; | |
86dc4139 | 5840 | + |
c2b27bf2 AM |
5841 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
5842 | + *a->errp = au_cpup_single(a->cpg, a->dst_parent); | |
5843 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 5844 | +} |
c2b27bf2 | 5845 | +#endif |
1facf9fc | 5846 | + |
53392da6 AM |
5847 | +/* |
5848 | + * prevent SIGXFSZ in copy-up. | |
5849 | + * testing CAP_MKNOD is for generic fs, | |
5850 | + * but CAP_FSETID is for xfs only, currently. | |
5851 | + */ | |
86dc4139 | 5852 | +static int au_cpup_sio_test(struct au_pin *pin, umode_t mode) |
53392da6 AM |
5853 | +{ |
5854 | + int do_sio; | |
86dc4139 AM |
5855 | + struct super_block *sb; |
5856 | + struct inode *h_dir; | |
53392da6 AM |
5857 | + |
5858 | + do_sio = 0; | |
86dc4139 | 5859 | + sb = au_pinned_parent(pin)->d_sb; |
53392da6 AM |
5860 | + if (!au_wkq_test() |
5861 | + && (!au_sbi(sb)->si_plink_maint_pid | |
5862 | + || au_plink_maint(sb, AuLock_NOPLM))) { | |
5863 | + switch (mode & S_IFMT) { | |
5864 | + case S_IFREG: | |
5865 | + /* no condition about RLIMIT_FSIZE and the file size */ | |
5866 | + do_sio = 1; | |
5867 | + break; | |
5868 | + case S_IFCHR: | |
5869 | + case S_IFBLK: | |
5870 | + do_sio = !capable(CAP_MKNOD); | |
5871 | + break; | |
5872 | + } | |
5873 | + if (!do_sio) | |
5874 | + do_sio = ((mode & (S_ISUID | S_ISGID)) | |
5875 | + && !capable(CAP_FSETID)); | |
86dc4139 AM |
5876 | + /* this workaround may be removed in the future */ |
5877 | + if (!do_sio) { | |
5878 | + h_dir = au_pinned_h_dir(pin); | |
5879 | + do_sio = h_dir->i_mode & S_ISVTX; | |
5880 | + } | |
53392da6 AM |
5881 | + } |
5882 | + | |
5883 | + return do_sio; | |
5884 | +} | |
5885 | + | |
7e9cd9fe | 5886 | +#if 0 /* reserved */ |
c2b27bf2 | 5887 | +int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) |
1facf9fc | 5888 | +{ |
5889 | + int err, wkq_err; | |
1facf9fc | 5890 | + struct dentry *h_dentry; |
5891 | + | |
c2b27bf2 | 5892 | + h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 | 5893 | + if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode)) |
c2b27bf2 | 5894 | + err = au_cpup_single(cpg, dst_parent); |
1facf9fc | 5895 | + else { |
5896 | + struct au_cpup_single_args args = { | |
5897 | + .errp = &err, | |
c2b27bf2 AM |
5898 | + .cpg = cpg, |
5899 | + .dst_parent = dst_parent | |
1facf9fc | 5900 | + }; |
5901 | + wkq_err = au_wkq_wait(au_call_cpup_single, &args); | |
5902 | + if (unlikely(wkq_err)) | |
5903 | + err = wkq_err; | |
5904 | + } | |
5905 | + | |
5906 | + return err; | |
5907 | +} | |
c2b27bf2 | 5908 | +#endif |
1facf9fc | 5909 | + |
5910 | +/* | |
5911 | + * copyup the @dentry from the first active lower branch to @bdst, | |
5912 | + * using au_cpup_single(). | |
5913 | + */ | |
c2b27bf2 | 5914 | +static int au_cpup_simple(struct au_cp_generic *cpg) |
1facf9fc | 5915 | +{ |
5916 | + int err; | |
c2b27bf2 AM |
5917 | + unsigned int flags_orig; |
5918 | + struct dentry *dentry; | |
5919 | + | |
5920 | + AuDebugOn(cpg->bsrc < 0); | |
1facf9fc | 5921 | + |
c2b27bf2 | 5922 | + dentry = cpg->dentry; |
86dc4139 | 5923 | + DiMustWriteLock(dentry); |
1facf9fc | 5924 | + |
c2b27bf2 | 5925 | + err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1); |
1facf9fc | 5926 | + if (!err) { |
c2b27bf2 AM |
5927 | + flags_orig = cpg->flags; |
5928 | + au_fset_cpup(cpg->flags, RENAME); | |
5929 | + err = au_cpup_single(cpg, NULL); | |
5930 | + cpg->flags = flags_orig; | |
1facf9fc | 5931 | + if (!err) |
5932 | + return 0; /* success */ | |
5933 | + | |
5934 | + /* revert */ | |
c2b27bf2 | 5935 | + au_set_h_dptr(dentry, cpg->bdst, NULL); |
5afbbe0d | 5936 | + au_set_dbtop(dentry, cpg->bsrc); |
1facf9fc | 5937 | + } |
5938 | + | |
5939 | + return err; | |
5940 | +} | |
5941 | + | |
5942 | +struct au_cpup_simple_args { | |
5943 | + int *errp; | |
c2b27bf2 | 5944 | + struct au_cp_generic *cpg; |
1facf9fc | 5945 | +}; |
5946 | + | |
5947 | +static void au_call_cpup_simple(void *args) | |
5948 | +{ | |
5949 | + struct au_cpup_simple_args *a = args; | |
86dc4139 | 5950 | + |
c2b27bf2 AM |
5951 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
5952 | + *a->errp = au_cpup_simple(a->cpg); | |
5953 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 5954 | +} |
5955 | + | |
c2b27bf2 | 5956 | +static int au_do_sio_cpup_simple(struct au_cp_generic *cpg) |
1facf9fc | 5957 | +{ |
5958 | + int err, wkq_err; | |
c2b27bf2 AM |
5959 | + struct dentry *dentry, *parent; |
5960 | + struct file *h_file; | |
1facf9fc | 5961 | + struct inode *h_dir; |
5962 | + | |
c2b27bf2 AM |
5963 | + dentry = cpg->dentry; |
5964 | + h_file = NULL; | |
5965 | + if (au_ftest_cpup(cpg->flags, HOPEN)) { | |
5966 | + AuDebugOn(cpg->bsrc < 0); | |
392086de | 5967 | + h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0); |
c2b27bf2 AM |
5968 | + err = PTR_ERR(h_file); |
5969 | + if (IS_ERR(h_file)) | |
5970 | + goto out; | |
5971 | + } | |
5972 | + | |
1facf9fc | 5973 | + parent = dget_parent(dentry); |
5527c038 | 5974 | + h_dir = au_h_iptr(d_inode(parent), cpg->bdst); |
53392da6 | 5975 | + if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE) |
5527c038 | 5976 | + && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) |
c2b27bf2 | 5977 | + err = au_cpup_simple(cpg); |
1facf9fc | 5978 | + else { |
5979 | + struct au_cpup_simple_args args = { | |
5980 | + .errp = &err, | |
c2b27bf2 | 5981 | + .cpg = cpg |
1facf9fc | 5982 | + }; |
5983 | + wkq_err = au_wkq_wait(au_call_cpup_simple, &args); | |
5984 | + if (unlikely(wkq_err)) | |
5985 | + err = wkq_err; | |
5986 | + } | |
5987 | + | |
5988 | + dput(parent); | |
c2b27bf2 AM |
5989 | + if (h_file) |
5990 | + au_h_open_post(dentry, cpg->bsrc, h_file); | |
5991 | + | |
5992 | +out: | |
1facf9fc | 5993 | + return err; |
5994 | +} | |
5995 | + | |
c2b27bf2 | 5996 | +int au_sio_cpup_simple(struct au_cp_generic *cpg) |
367653fa | 5997 | +{ |
5afbbe0d | 5998 | + aufs_bindex_t bsrc, bbot; |
c2b27bf2 | 5999 | + struct dentry *dentry, *h_dentry; |
367653fa | 6000 | + |
c2b27bf2 AM |
6001 | + if (cpg->bsrc < 0) { |
6002 | + dentry = cpg->dentry; | |
5afbbe0d AM |
6003 | + bbot = au_dbbot(dentry); |
6004 | + for (bsrc = cpg->bdst + 1; bsrc <= bbot; bsrc++) { | |
c2b27bf2 AM |
6005 | + h_dentry = au_h_dptr(dentry, bsrc); |
6006 | + if (h_dentry) { | |
5527c038 | 6007 | + AuDebugOn(d_is_negative(h_dentry)); |
c2b27bf2 AM |
6008 | + break; |
6009 | + } | |
6010 | + } | |
5afbbe0d | 6011 | + AuDebugOn(bsrc > bbot); |
c2b27bf2 | 6012 | + cpg->bsrc = bsrc; |
367653fa | 6013 | + } |
c2b27bf2 AM |
6014 | + AuDebugOn(cpg->bsrc <= cpg->bdst); |
6015 | + return au_do_sio_cpup_simple(cpg); | |
6016 | +} | |
367653fa | 6017 | + |
c2b27bf2 AM |
6018 | +int au_sio_cpdown_simple(struct au_cp_generic *cpg) |
6019 | +{ | |
6020 | + AuDebugOn(cpg->bdst <= cpg->bsrc); | |
6021 | + return au_do_sio_cpup_simple(cpg); | |
367653fa AM |
6022 | +} |
6023 | + | |
1facf9fc | 6024 | +/* ---------------------------------------------------------------------- */ |
6025 | + | |
6026 | +/* | |
6027 | + * copyup the deleted file for writing. | |
6028 | + */ | |
c2b27bf2 AM |
6029 | +static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry, |
6030 | + struct file *file) | |
1facf9fc | 6031 | +{ |
6032 | + int err; | |
c2b27bf2 AM |
6033 | + unsigned int flags_orig; |
6034 | + aufs_bindex_t bsrc_orig; | |
c2b27bf2 | 6035 | + struct au_dinfo *dinfo; |
5afbbe0d AM |
6036 | + struct { |
6037 | + struct au_hdentry *hd; | |
6038 | + struct dentry *h_dentry; | |
6039 | + } hdst, hsrc; | |
1facf9fc | 6040 | + |
c2b27bf2 | 6041 | + dinfo = au_di(cpg->dentry); |
1308ab2a | 6042 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
6043 | + | |
c2b27bf2 | 6044 | + bsrc_orig = cpg->bsrc; |
5afbbe0d AM |
6045 | + cpg->bsrc = dinfo->di_btop; |
6046 | + hdst.hd = au_hdentry(dinfo, cpg->bdst); | |
6047 | + hdst.h_dentry = hdst.hd->hd_dentry; | |
6048 | + hdst.hd->hd_dentry = wh_dentry; | |
6049 | + dinfo->di_btop = cpg->bdst; | |
6050 | + | |
6051 | + hsrc.h_dentry = NULL; | |
027c5e7a | 6052 | + if (file) { |
5afbbe0d AM |
6053 | + hsrc.hd = au_hdentry(dinfo, cpg->bsrc); |
6054 | + hsrc.h_dentry = hsrc.hd->hd_dentry; | |
6055 | + hsrc.hd->hd_dentry = au_hf_top(file)->f_path.dentry; | |
027c5e7a | 6056 | + } |
c2b27bf2 AM |
6057 | + flags_orig = cpg->flags; |
6058 | + cpg->flags = !AuCpup_DTIME; | |
6059 | + err = au_cpup_single(cpg, /*h_parent*/NULL); | |
6060 | + cpg->flags = flags_orig; | |
027c5e7a AM |
6061 | + if (file) { |
6062 | + if (!err) | |
6063 | + err = au_reopen_nondir(file); | |
5afbbe0d | 6064 | + hsrc.hd->hd_dentry = hsrc.h_dentry; |
1facf9fc | 6065 | + } |
5afbbe0d AM |
6066 | + hdst.hd->hd_dentry = hdst.h_dentry; |
6067 | + dinfo->di_btop = cpg->bsrc; | |
c2b27bf2 | 6068 | + cpg->bsrc = bsrc_orig; |
1facf9fc | 6069 | + |
6070 | + return err; | |
6071 | +} | |
6072 | + | |
c2b27bf2 | 6073 | +static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file) |
1facf9fc | 6074 | +{ |
6075 | + int err; | |
c2b27bf2 | 6076 | + aufs_bindex_t bdst; |
1facf9fc | 6077 | + struct au_dtime dt; |
c2b27bf2 | 6078 | + struct dentry *dentry, *parent, *h_parent, *wh_dentry; |
1facf9fc | 6079 | + struct au_branch *br; |
6080 | + struct path h_path; | |
6081 | + | |
c2b27bf2 AM |
6082 | + dentry = cpg->dentry; |
6083 | + bdst = cpg->bdst; | |
1facf9fc | 6084 | + br = au_sbr(dentry->d_sb, bdst); |
6085 | + parent = dget_parent(dentry); | |
6086 | + h_parent = au_h_dptr(parent, bdst); | |
6087 | + wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
6088 | + err = PTR_ERR(wh_dentry); | |
6089 | + if (IS_ERR(wh_dentry)) | |
6090 | + goto out; | |
6091 | + | |
6092 | + h_path.dentry = h_parent; | |
86dc4139 | 6093 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 6094 | + au_dtime_store(&dt, parent, &h_path); |
c2b27bf2 | 6095 | + err = au_do_cpup_wh(cpg, wh_dentry, file); |
1facf9fc | 6096 | + if (unlikely(err)) |
6097 | + goto out_wh; | |
6098 | + | |
6099 | + dget(wh_dentry); | |
6100 | + h_path.dentry = wh_dentry; | |
2000de60 | 6101 | + if (!d_is_dir(wh_dentry)) { |
523b37e3 | 6102 | + /* no delegation since it is just created */ |
5527c038 | 6103 | + err = vfsub_unlink(d_inode(h_parent), &h_path, |
523b37e3 AM |
6104 | + /*delegated*/NULL, /*force*/0); |
6105 | + } else | |
5527c038 | 6106 | + err = vfsub_rmdir(d_inode(h_parent), &h_path); |
1facf9fc | 6107 | + if (unlikely(err)) { |
523b37e3 AM |
6108 | + AuIOErr("failed remove copied-up tmp file %pd(%d)\n", |
6109 | + wh_dentry, err); | |
1facf9fc | 6110 | + err = -EIO; |
6111 | + } | |
6112 | + au_dtime_revert(&dt); | |
5527c038 | 6113 | + au_set_hi_wh(d_inode(dentry), bdst, wh_dentry); |
1facf9fc | 6114 | + |
4f0767ce | 6115 | +out_wh: |
1facf9fc | 6116 | + dput(wh_dentry); |
4f0767ce | 6117 | +out: |
1facf9fc | 6118 | + dput(parent); |
6119 | + return err; | |
6120 | +} | |
6121 | + | |
6122 | +struct au_cpup_wh_args { | |
6123 | + int *errp; | |
c2b27bf2 | 6124 | + struct au_cp_generic *cpg; |
1facf9fc | 6125 | + struct file *file; |
6126 | +}; | |
6127 | + | |
6128 | +static void au_call_cpup_wh(void *args) | |
6129 | +{ | |
6130 | + struct au_cpup_wh_args *a = args; | |
86dc4139 | 6131 | + |
c2b27bf2 AM |
6132 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
6133 | + *a->errp = au_cpup_wh(a->cpg, a->file); | |
6134 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 6135 | +} |
6136 | + | |
c2b27bf2 | 6137 | +int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file) |
1facf9fc | 6138 | +{ |
6139 | + int err, wkq_err; | |
c2b27bf2 | 6140 | + aufs_bindex_t bdst; |
c1595e42 | 6141 | + struct dentry *dentry, *parent, *h_orph, *h_parent; |
86dc4139 | 6142 | + struct inode *dir, *h_dir, *h_tmpdir; |
1facf9fc | 6143 | + struct au_wbr *wbr; |
c2b27bf2 | 6144 | + struct au_pin wh_pin, *pin_orig; |
1facf9fc | 6145 | + |
c2b27bf2 AM |
6146 | + dentry = cpg->dentry; |
6147 | + bdst = cpg->bdst; | |
1facf9fc | 6148 | + parent = dget_parent(dentry); |
5527c038 | 6149 | + dir = d_inode(parent); |
1facf9fc | 6150 | + h_orph = NULL; |
6151 | + h_parent = NULL; | |
6152 | + h_dir = au_igrab(au_h_iptr(dir, bdst)); | |
6153 | + h_tmpdir = h_dir; | |
c2b27bf2 | 6154 | + pin_orig = NULL; |
1facf9fc | 6155 | + if (!h_dir->i_nlink) { |
6156 | + wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; | |
6157 | + h_orph = wbr->wbr_orph; | |
6158 | + | |
6159 | + h_parent = dget(au_h_dptr(parent, bdst)); | |
1facf9fc | 6160 | + au_set_h_dptr(parent, bdst, dget(h_orph)); |
5527c038 | 6161 | + h_tmpdir = d_inode(h_orph); |
1facf9fc | 6162 | + au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); |
6163 | + | |
febd17d6 | 6164 | + inode_lock_nested(h_tmpdir, AuLsc_I_PARENT3); |
4a4d8108 | 6165 | + /* todo: au_h_open_pre()? */ |
86dc4139 | 6166 | + |
c2b27bf2 | 6167 | + pin_orig = cpg->pin; |
86dc4139 | 6168 | + au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT, |
c2b27bf2 AM |
6169 | + AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED); |
6170 | + cpg->pin = &wh_pin; | |
1facf9fc | 6171 | + } |
6172 | + | |
53392da6 | 6173 | + if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE) |
5527c038 | 6174 | + && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) |
c2b27bf2 | 6175 | + err = au_cpup_wh(cpg, file); |
1facf9fc | 6176 | + else { |
6177 | + struct au_cpup_wh_args args = { | |
6178 | + .errp = &err, | |
c2b27bf2 AM |
6179 | + .cpg = cpg, |
6180 | + .file = file | |
1facf9fc | 6181 | + }; |
6182 | + wkq_err = au_wkq_wait(au_call_cpup_wh, &args); | |
6183 | + if (unlikely(wkq_err)) | |
6184 | + err = wkq_err; | |
6185 | + } | |
6186 | + | |
6187 | + if (h_orph) { | |
febd17d6 | 6188 | + inode_unlock(h_tmpdir); |
4a4d8108 | 6189 | + /* todo: au_h_open_post()? */ |
1facf9fc | 6190 | + au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); |
1facf9fc | 6191 | + au_set_h_dptr(parent, bdst, h_parent); |
c2b27bf2 AM |
6192 | + AuDebugOn(!pin_orig); |
6193 | + cpg->pin = pin_orig; | |
1facf9fc | 6194 | + } |
6195 | + iput(h_dir); | |
6196 | + dput(parent); | |
6197 | + | |
6198 | + return err; | |
6199 | +} | |
6200 | + | |
6201 | +/* ---------------------------------------------------------------------- */ | |
6202 | + | |
6203 | +/* | |
6204 | + * generic routine for both of copy-up and copy-down. | |
6205 | + */ | |
6206 | +/* cf. revalidate function in file.c */ | |
6207 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
6208 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6209 | + struct au_pin *pin, |
1facf9fc | 6210 | + struct dentry *h_parent, void *arg), |
6211 | + void *arg) | |
6212 | +{ | |
6213 | + int err; | |
6214 | + struct au_pin pin; | |
5527c038 | 6215 | + struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry; |
1facf9fc | 6216 | + |
6217 | + err = 0; | |
6218 | + parent = dget_parent(dentry); | |
6219 | + if (IS_ROOT(parent)) | |
6220 | + goto out; | |
6221 | + | |
6222 | + au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, | |
6223 | + au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); | |
6224 | + | |
6225 | + /* do not use au_dpage */ | |
6226 | + real_parent = parent; | |
6227 | + while (1) { | |
6228 | + dput(parent); | |
6229 | + parent = dget_parent(dentry); | |
6230 | + h_parent = au_h_dptr(parent, bdst); | |
6231 | + if (h_parent) | |
6232 | + goto out; /* success */ | |
6233 | + | |
6234 | + /* find top dir which is necessary to cpup */ | |
6235 | + do { | |
6236 | + d = parent; | |
6237 | + dput(parent); | |
6238 | + parent = dget_parent(d); | |
6239 | + di_read_lock_parent3(parent, !AuLock_IR); | |
6240 | + h_parent = au_h_dptr(parent, bdst); | |
6241 | + di_read_unlock(parent, !AuLock_IR); | |
6242 | + } while (!h_parent); | |
6243 | + | |
6244 | + if (d != real_parent) | |
6245 | + di_write_lock_child3(d); | |
6246 | + | |
6247 | + /* somebody else might create while we were sleeping */ | |
5527c038 JR |
6248 | + h_dentry = au_h_dptr(d, bdst); |
6249 | + if (!h_dentry || d_is_negative(h_dentry)) { | |
6250 | + if (h_dentry) | |
5afbbe0d | 6251 | + au_update_dbtop(d); |
1facf9fc | 6252 | + |
6253 | + au_pin_set_dentry(&pin, d); | |
6254 | + err = au_do_pin(&pin); | |
6255 | + if (!err) { | |
86dc4139 | 6256 | + err = cp(d, bdst, &pin, h_parent, arg); |
1facf9fc | 6257 | + au_unpin(&pin); |
6258 | + } | |
6259 | + } | |
6260 | + | |
6261 | + if (d != real_parent) | |
6262 | + di_write_unlock(d); | |
6263 | + if (unlikely(err)) | |
6264 | + break; | |
6265 | + } | |
6266 | + | |
4f0767ce | 6267 | +out: |
1facf9fc | 6268 | + dput(parent); |
6269 | + return err; | |
6270 | +} | |
6271 | + | |
6272 | +static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6273 | + struct au_pin *pin, |
2000de60 | 6274 | + struct dentry *h_parent __maybe_unused, |
1facf9fc | 6275 | + void *arg __maybe_unused) |
6276 | +{ | |
c2b27bf2 AM |
6277 | + struct au_cp_generic cpg = { |
6278 | + .dentry = dentry, | |
6279 | + .bdst = bdst, | |
6280 | + .bsrc = -1, | |
6281 | + .len = 0, | |
6282 | + .pin = pin, | |
6283 | + .flags = AuCpup_DTIME | |
6284 | + }; | |
6285 | + return au_sio_cpup_simple(&cpg); | |
1facf9fc | 6286 | +} |
6287 | + | |
6288 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
6289 | +{ | |
6290 | + return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); | |
6291 | +} | |
6292 | + | |
6293 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
6294 | +{ | |
6295 | + int err; | |
6296 | + struct dentry *parent; | |
6297 | + struct inode *dir; | |
6298 | + | |
6299 | + parent = dget_parent(dentry); | |
5527c038 | 6300 | + dir = d_inode(parent); |
1facf9fc | 6301 | + err = 0; |
6302 | + if (au_h_iptr(dir, bdst)) | |
6303 | + goto out; | |
6304 | + | |
6305 | + di_read_unlock(parent, AuLock_IR); | |
6306 | + di_write_lock_parent(parent); | |
6307 | + /* someone else might change our inode while we were sleeping */ | |
6308 | + if (!au_h_iptr(dir, bdst)) | |
6309 | + err = au_cpup_dirs(dentry, bdst); | |
6310 | + di_downgrade_lock(parent, AuLock_IR); | |
6311 | + | |
4f0767ce | 6312 | +out: |
1facf9fc | 6313 | + dput(parent); |
6314 | + return err; | |
6315 | +} | |
7f207e10 | 6316 | diff -urN /usr/share/empty/fs/aufs/cpup.h linux/fs/aufs/cpup.h |
eca34b5c | 6317 | --- /usr/share/empty/fs/aufs/cpup.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 6318 | +++ linux/fs/aufs/cpup.h 2020-01-27 10:57:18.168871450 +0100 |
062440b3 AM |
6319 | @@ -0,0 +1,100 @@ |
6320 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 6321 | +/* |
016522bc | 6322 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 6323 | + * |
6324 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6325 | + * it under the terms of the GNU General Public License as published by | |
6326 | + * the Free Software Foundation; either version 2 of the License, or | |
6327 | + * (at your option) any later version. | |
dece6358 AM |
6328 | + * |
6329 | + * This program is distributed in the hope that it will be useful, | |
6330 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6331 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6332 | + * GNU General Public License for more details. | |
6333 | + * | |
6334 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 6335 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 6336 | + */ |
6337 | + | |
6338 | +/* | |
6339 | + * copy-up/down functions | |
6340 | + */ | |
6341 | + | |
6342 | +#ifndef __AUFS_CPUP_H__ | |
6343 | +#define __AUFS_CPUP_H__ | |
6344 | + | |
6345 | +#ifdef __KERNEL__ | |
6346 | + | |
dece6358 | 6347 | +#include <linux/path.h> |
1facf9fc | 6348 | + |
dece6358 AM |
6349 | +struct inode; |
6350 | +struct file; | |
86dc4139 | 6351 | +struct au_pin; |
dece6358 | 6352 | + |
86dc4139 | 6353 | +void au_cpup_attr_flags(struct inode *dst, unsigned int iflags); |
1facf9fc | 6354 | +void au_cpup_attr_timesizes(struct inode *inode); |
6355 | +void au_cpup_attr_nlink(struct inode *inode, int force); | |
6356 | +void au_cpup_attr_changeable(struct inode *inode); | |
6357 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode); | |
6358 | +void au_cpup_attr_all(struct inode *inode, int force); | |
6359 | + | |
6360 | +/* ---------------------------------------------------------------------- */ | |
6361 | + | |
c2b27bf2 AM |
6362 | +struct au_cp_generic { |
6363 | + struct dentry *dentry; | |
6364 | + aufs_bindex_t bdst, bsrc; | |
6365 | + loff_t len; | |
6366 | + struct au_pin *pin; | |
6367 | + unsigned int flags; | |
6368 | +}; | |
6369 | + | |
1facf9fc | 6370 | +/* cpup flags */ |
392086de AM |
6371 | +#define AuCpup_DTIME 1 /* do dtime_store/revert */ |
6372 | +#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino, | |
6373 | + for link(2) */ | |
6374 | +#define AuCpup_RENAME (1 << 2) /* rename after cpup */ | |
6375 | +#define AuCpup_HOPEN (1 << 3) /* call h_open_pre/post() in | |
6376 | + cpup */ | |
6377 | +#define AuCpup_OVERWRITE (1 << 4) /* allow overwriting the | |
6378 | + existing entry */ | |
6379 | +#define AuCpup_RWDST (1 << 5) /* force write target even if | |
6380 | + the branch is marked as RO */ | |
c2b27bf2 | 6381 | + |
8b6a4947 AM |
6382 | +#ifndef CONFIG_AUFS_BR_HFSPLUS |
6383 | +#undef AuCpup_HOPEN | |
6384 | +#define AuCpup_HOPEN 0 | |
6385 | +#endif | |
6386 | + | |
1facf9fc | 6387 | +#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name) |
7f207e10 AM |
6388 | +#define au_fset_cpup(flags, name) \ |
6389 | + do { (flags) |= AuCpup_##name; } while (0) | |
6390 | +#define au_fclr_cpup(flags, name) \ | |
6391 | + do { (flags) &= ~AuCpup_##name; } while (0) | |
1facf9fc | 6392 | + |
6393 | +int au_copy_file(struct file *dst, struct file *src, loff_t len); | |
c2b27bf2 AM |
6394 | +int au_sio_cpup_simple(struct au_cp_generic *cpg); |
6395 | +int au_sio_cpdown_simple(struct au_cp_generic *cpg); | |
6396 | +int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file); | |
1facf9fc | 6397 | + |
6398 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
6399 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6400 | + struct au_pin *pin, |
1facf9fc | 6401 | + struct dentry *h_parent, void *arg), |
6402 | + void *arg); | |
6403 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
6404 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
6405 | + | |
6406 | +/* ---------------------------------------------------------------------- */ | |
6407 | + | |
6408 | +/* keep timestamps when copyup */ | |
6409 | +struct au_dtime { | |
6410 | + struct dentry *dt_dentry; | |
6411 | + struct path dt_h_path; | |
cd7a4cd9 | 6412 | + struct timespec64 dt_atime, dt_mtime; |
1facf9fc | 6413 | +}; |
6414 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
6415 | + struct path *h_path); | |
6416 | +void au_dtime_revert(struct au_dtime *dt); | |
6417 | + | |
6418 | +#endif /* __KERNEL__ */ | |
6419 | +#endif /* __AUFS_CPUP_H__ */ | |
7f207e10 | 6420 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.c linux/fs/aufs/dbgaufs.c |
eca34b5c | 6421 | --- /usr/share/empty/fs/aufs/dbgaufs.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 6422 | +++ linux/fs/aufs/dbgaufs.c 2020-01-27 10:57:18.168871450 +0100 |
9f237c51 | 6423 | @@ -0,0 +1,526 @@ |
cd7a4cd9 | 6424 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 6425 | +/* |
016522bc | 6426 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 6427 | + * |
6428 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6429 | + * it under the terms of the GNU General Public License as published by | |
6430 | + * the Free Software Foundation; either version 2 of the License, or | |
6431 | + * (at your option) any later version. | |
dece6358 AM |
6432 | + * |
6433 | + * This program is distributed in the hope that it will be useful, | |
6434 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6435 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6436 | + * GNU General Public License for more details. | |
6437 | + * | |
6438 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 6439 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 6440 | + */ |
6441 | + | |
6442 | +/* | |
6443 | + * debugfs interface | |
6444 | + */ | |
6445 | + | |
6446 | +#include <linux/debugfs.h> | |
6447 | +#include "aufs.h" | |
6448 | + | |
6449 | +#ifndef CONFIG_SYSFS | |
6450 | +#error DEBUG_FS depends upon SYSFS | |
6451 | +#endif | |
6452 | + | |
6453 | +static struct dentry *dbgaufs; | |
cd7a4cd9 | 6454 | +static const mode_t dbgaufs_mode = 0444; |
1facf9fc | 6455 | + |
6456 | +/* 20 is max digits length of ulong 64 */ | |
6457 | +struct dbgaufs_arg { | |
6458 | + int n; | |
6459 | + char a[20 * 4]; | |
6460 | +}; | |
6461 | + | |
6462 | +/* | |
6463 | + * common function for all XINO files | |
6464 | + */ | |
6465 | +static int dbgaufs_xi_release(struct inode *inode __maybe_unused, | |
6466 | + struct file *file) | |
6467 | +{ | |
9f237c51 AM |
6468 | + void *p; |
6469 | + | |
6470 | + p = file->private_data; | |
6471 | + if (p) { | |
6472 | + /* this is struct dbgaufs_arg */ | |
6473 | + AuDebugOn(!au_kfree_sz_test(p)); | |
6474 | + au_kfree_do_rcu(p); | |
6475 | + } | |
1facf9fc | 6476 | + return 0; |
6477 | +} | |
6478 | + | |
062440b3 AM |
6479 | +static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt, |
6480 | + int cnt) | |
1facf9fc | 6481 | +{ |
6482 | + int err; | |
6483 | + struct kstat st; | |
6484 | + struct dbgaufs_arg *p; | |
6485 | + | |
6486 | + err = -ENOMEM; | |
6487 | + p = kmalloc(sizeof(*p), GFP_NOFS); | |
6488 | + if (unlikely(!p)) | |
6489 | + goto out; | |
6490 | + | |
6491 | + err = 0; | |
6492 | + p->n = 0; | |
6493 | + file->private_data = p; | |
6494 | + if (!xf) | |
6495 | + goto out; | |
6496 | + | |
521ced18 | 6497 | + err = vfsub_getattr(&xf->f_path, &st); |
1facf9fc | 6498 | + if (!err) { |
6499 | + if (do_fcnt) | |
6500 | + p->n = snprintf | |
062440b3 AM |
6501 | + (p->a, sizeof(p->a), "%d, %llux%u %lld\n", |
6502 | + cnt, st.blocks, st.blksize, | |
1facf9fc | 6503 | + (long long)st.size); |
6504 | + else | |
521ced18 | 6505 | + p->n = snprintf(p->a, sizeof(p->a), "%llux%u %lld\n", |
1facf9fc | 6506 | + st.blocks, st.blksize, |
6507 | + (long long)st.size); | |
6508 | + AuDebugOn(p->n >= sizeof(p->a)); | |
6509 | + } else { | |
6510 | + p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err); | |
6511 | + err = 0; | |
6512 | + } | |
6513 | + | |
4f0767ce | 6514 | +out: |
1facf9fc | 6515 | + return err; |
1facf9fc | 6516 | +} |
6517 | + | |
6518 | +static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf, | |
6519 | + size_t count, loff_t *ppos) | |
6520 | +{ | |
6521 | + struct dbgaufs_arg *p; | |
6522 | + | |
6523 | + p = file->private_data; | |
6524 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
6525 | +} | |
6526 | + | |
6527 | +/* ---------------------------------------------------------------------- */ | |
6528 | + | |
86dc4139 AM |
6529 | +struct dbgaufs_plink_arg { |
6530 | + int n; | |
6531 | + char a[]; | |
6532 | +}; | |
6533 | + | |
6534 | +static int dbgaufs_plink_release(struct inode *inode __maybe_unused, | |
6535 | + struct file *file) | |
6536 | +{ | |
1c60b727 | 6537 | + free_page((unsigned long)file->private_data); |
86dc4139 AM |
6538 | + return 0; |
6539 | +} | |
6540 | + | |
6541 | +static int dbgaufs_plink_open(struct inode *inode, struct file *file) | |
6542 | +{ | |
6543 | + int err, i, limit; | |
6544 | + unsigned long n, sum; | |
6545 | + struct dbgaufs_plink_arg *p; | |
6546 | + struct au_sbinfo *sbinfo; | |
6547 | + struct super_block *sb; | |
8b6a4947 | 6548 | + struct hlist_bl_head *hbl; |
86dc4139 AM |
6549 | + |
6550 | + err = -ENOMEM; | |
6551 | + p = (void *)get_zeroed_page(GFP_NOFS); | |
6552 | + if (unlikely(!p)) | |
6553 | + goto out; | |
6554 | + | |
6555 | + err = -EFBIG; | |
6556 | + sbinfo = inode->i_private; | |
6557 | + sb = sbinfo->si_sb; | |
6558 | + si_noflush_read_lock(sb); | |
6559 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
6560 | + limit = PAGE_SIZE - sizeof(p->n); | |
6561 | + | |
6562 | + /* the number of buckets */ | |
6563 | + n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH); | |
6564 | + p->n += n; | |
6565 | + limit -= n; | |
6566 | + | |
6567 | + sum = 0; | |
8b6a4947 AM |
6568 | + for (i = 0, hbl = sbinfo->si_plink; i < AuPlink_NHASH; |
6569 | + i++, hbl++) { | |
6570 | + n = au_hbl_count(hbl); | |
86dc4139 AM |
6571 | + sum += n; |
6572 | + | |
6573 | + n = snprintf(p->a + p->n, limit, "%lu ", n); | |
6574 | + p->n += n; | |
6575 | + limit -= n; | |
6576 | + if (unlikely(limit <= 0)) | |
6577 | + goto out_free; | |
6578 | + } | |
6579 | + p->a[p->n - 1] = '\n'; | |
6580 | + | |
6581 | + /* the sum of plinks */ | |
6582 | + n = snprintf(p->a + p->n, limit, "%lu\n", sum); | |
6583 | + p->n += n; | |
6584 | + limit -= n; | |
6585 | + if (unlikely(limit <= 0)) | |
6586 | + goto out_free; | |
6587 | + } else { | |
6588 | +#define str "1\n0\n0\n" | |
6589 | + p->n = sizeof(str) - 1; | |
6590 | + strcpy(p->a, str); | |
6591 | +#undef str | |
6592 | + } | |
6593 | + si_read_unlock(sb); | |
6594 | + | |
6595 | + err = 0; | |
6596 | + file->private_data = p; | |
6597 | + goto out; /* success */ | |
6598 | + | |
6599 | +out_free: | |
1c60b727 | 6600 | + free_page((unsigned long)p); |
86dc4139 AM |
6601 | +out: |
6602 | + return err; | |
6603 | +} | |
6604 | + | |
6605 | +static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf, | |
6606 | + size_t count, loff_t *ppos) | |
6607 | +{ | |
6608 | + struct dbgaufs_plink_arg *p; | |
6609 | + | |
6610 | + p = file->private_data; | |
6611 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
6612 | +} | |
6613 | + | |
6614 | +static const struct file_operations dbgaufs_plink_fop = { | |
6615 | + .owner = THIS_MODULE, | |
6616 | + .open = dbgaufs_plink_open, | |
6617 | + .release = dbgaufs_plink_release, | |
6618 | + .read = dbgaufs_plink_read | |
6619 | +}; | |
6620 | + | |
6621 | +/* ---------------------------------------------------------------------- */ | |
6622 | + | |
1facf9fc | 6623 | +static int dbgaufs_xib_open(struct inode *inode, struct file *file) |
6624 | +{ | |
6625 | + int err; | |
6626 | + struct au_sbinfo *sbinfo; | |
6627 | + struct super_block *sb; | |
6628 | + | |
6629 | + sbinfo = inode->i_private; | |
6630 | + sb = sbinfo->si_sb; | |
6631 | + si_noflush_read_lock(sb); | |
062440b3 | 6632 | + err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0, /*cnt*/0); |
1facf9fc | 6633 | + si_read_unlock(sb); |
6634 | + return err; | |
6635 | +} | |
6636 | + | |
6637 | +static const struct file_operations dbgaufs_xib_fop = { | |
4a4d8108 | 6638 | + .owner = THIS_MODULE, |
1facf9fc | 6639 | + .open = dbgaufs_xib_open, |
6640 | + .release = dbgaufs_xi_release, | |
6641 | + .read = dbgaufs_xi_read | |
6642 | +}; | |
6643 | + | |
6644 | +/* ---------------------------------------------------------------------- */ | |
6645 | + | |
6646 | +#define DbgaufsXi_PREFIX "xi" | |
6647 | + | |
6648 | +static int dbgaufs_xino_open(struct inode *inode, struct file *file) | |
6649 | +{ | |
acd2b654 | 6650 | + int err, idx; |
1facf9fc | 6651 | + long l; |
acd2b654 AM |
6652 | + aufs_bindex_t bindex; |
6653 | + char *p, a[sizeof(DbgaufsXi_PREFIX) + 8]; | |
1facf9fc | 6654 | + struct au_sbinfo *sbinfo; |
6655 | + struct super_block *sb; | |
acd2b654 | 6656 | + struct au_xino *xi; |
1facf9fc | 6657 | + struct file *xf; |
6658 | + struct qstr *name; | |
062440b3 | 6659 | + struct au_branch *br; |
1facf9fc | 6660 | + |
6661 | + err = -ENOENT; | |
2000de60 | 6662 | + name = &file->f_path.dentry->d_name; |
1facf9fc | 6663 | + if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX) |
6664 | + || memcmp(name->name, DbgaufsXi_PREFIX, | |
6665 | + sizeof(DbgaufsXi_PREFIX) - 1))) | |
6666 | + goto out; | |
acd2b654 AM |
6667 | + |
6668 | + AuDebugOn(name->len >= sizeof(a)); | |
6669 | + memcpy(a, name->name, name->len); | |
6670 | + a[name->len] = '\0'; | |
6671 | + p = strchr(a, '-'); | |
6672 | + if (p) | |
6673 | + *p = '\0'; | |
6674 | + err = kstrtol(a + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l); | |
1facf9fc | 6675 | + if (unlikely(err)) |
6676 | + goto out; | |
acd2b654 AM |
6677 | + bindex = l; |
6678 | + idx = 0; | |
6679 | + if (p) { | |
6680 | + err = kstrtol(p + 1, 10, &l); | |
6681 | + if (unlikely(err)) | |
6682 | + goto out; | |
6683 | + idx = l; | |
6684 | + } | |
1facf9fc | 6685 | + |
acd2b654 | 6686 | + err = -ENOENT; |
1facf9fc | 6687 | + sbinfo = inode->i_private; |
6688 | + sb = sbinfo->si_sb; | |
6689 | + si_noflush_read_lock(sb); | |
acd2b654 AM |
6690 | + if (unlikely(bindex < 0 || bindex > au_sbbot(sb))) |
6691 | + goto out_si; | |
6692 | + br = au_sbr(sb, bindex); | |
6693 | + xi = br->br_xino; | |
6694 | + if (unlikely(idx >= xi->xi_nfile)) | |
6695 | + goto out_si; | |
6696 | + xf = au_xino_file(xi, idx); | |
6697 | + if (xf) | |
062440b3 AM |
6698 | + err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1, |
6699 | + au_xino_count(br)); | |
1facf9fc | 6700 | + |
acd2b654 AM |
6701 | +out_si: |
6702 | + si_read_unlock(sb); | |
4f0767ce | 6703 | +out: |
acd2b654 | 6704 | + AuTraceErr(err); |
1facf9fc | 6705 | + return err; |
6706 | +} | |
6707 | + | |
6708 | +static const struct file_operations dbgaufs_xino_fop = { | |
4a4d8108 | 6709 | + .owner = THIS_MODULE, |
1facf9fc | 6710 | + .open = dbgaufs_xino_open, |
6711 | + .release = dbgaufs_xi_release, | |
6712 | + .read = dbgaufs_xi_read | |
6713 | +}; | |
6714 | + | |
062440b3 AM |
6715 | +void dbgaufs_xino_del(struct au_branch *br) |
6716 | +{ | |
6717 | + struct dentry *dbgaufs; | |
6718 | + | |
6719 | + dbgaufs = br->br_dbgaufs; | |
6720 | + if (!dbgaufs) | |
6721 | + return; | |
6722 | + | |
6723 | + br->br_dbgaufs = NULL; | |
6724 | + /* debugfs acquires the parent i_mutex */ | |
6725 | + lockdep_off(); | |
6726 | + debugfs_remove(dbgaufs); | |
6727 | + lockdep_on(); | |
6728 | +} | |
6729 | + | |
1facf9fc | 6730 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) |
6731 | +{ | |
5afbbe0d | 6732 | + aufs_bindex_t bbot; |
1facf9fc | 6733 | + struct au_branch *br; |
1facf9fc | 6734 | + |
6735 | + if (!au_sbi(sb)->si_dbgaufs) | |
6736 | + return; | |
6737 | + | |
5afbbe0d AM |
6738 | + bbot = au_sbbot(sb); |
6739 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 6740 | + br = au_sbr(sb, bindex); |
062440b3 AM |
6741 | + dbgaufs_xino_del(br); |
6742 | + } | |
6743 | +} | |
6744 | + | |
acd2b654 AM |
6745 | +static void dbgaufs_br_do_add(struct super_block *sb, aufs_bindex_t bindex, |
6746 | + unsigned int idx, struct dentry *parent, | |
6747 | + struct au_sbinfo *sbinfo) | |
062440b3 AM |
6748 | +{ |
6749 | + struct au_branch *br; | |
6750 | + struct dentry *d; | |
acd2b654 AM |
6751 | + /* "xi" bindex(5) "-" idx(2) NULL */ |
6752 | + char name[sizeof(DbgaufsXi_PREFIX) + 8]; | |
062440b3 | 6753 | + |
acd2b654 AM |
6754 | + if (!idx) |
6755 | + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex); | |
6756 | + else | |
6757 | + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d-%u", | |
6758 | + bindex, idx); | |
062440b3 AM |
6759 | + br = au_sbr(sb, bindex); |
6760 | + if (br->br_dbgaufs) { | |
6761 | + struct qstr qstr = QSTR_INIT(name, strlen(name)); | |
6762 | + | |
6763 | + if (!au_qstreq(&br->br_dbgaufs->d_name, &qstr)) { | |
6764 | + /* debugfs acquires the parent i_mutex */ | |
6765 | + lockdep_off(); | |
6766 | + d = debugfs_rename(parent, br->br_dbgaufs, parent, | |
6767 | + name); | |
6768 | + lockdep_on(); | |
6769 | + if (unlikely(!d)) | |
6770 | + pr_warn("failed renaming %pd/%s, ignored.\n", | |
6771 | + parent, name); | |
6772 | + } | |
6773 | + } else { | |
e2f27e51 | 6774 | + lockdep_off(); |
062440b3 AM |
6775 | + br->br_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent, |
6776 | + sbinfo, &dbgaufs_xino_fop); | |
e2f27e51 | 6777 | + lockdep_on(); |
062440b3 | 6778 | + if (unlikely(!br->br_dbgaufs)) |
acd2b654 | 6779 | + pr_warn("failed creating %pd/%s, ignored.\n", |
062440b3 | 6780 | + parent, name); |
1facf9fc | 6781 | + } |
6782 | +} | |
6783 | + | |
acd2b654 AM |
6784 | +static void dbgaufs_br_add(struct super_block *sb, aufs_bindex_t bindex, |
6785 | + struct dentry *parent, struct au_sbinfo *sbinfo) | |
6786 | +{ | |
6787 | + struct au_branch *br; | |
6788 | + struct au_xino *xi; | |
6789 | + unsigned int u; | |
6790 | + | |
6791 | + br = au_sbr(sb, bindex); | |
6792 | + xi = br->br_xino; | |
6793 | + for (u = 0; u < xi->xi_nfile; u++) | |
6794 | + dbgaufs_br_do_add(sb, bindex, u, parent, sbinfo); | |
6795 | +} | |
6796 | + | |
062440b3 | 6797 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown) |
1facf9fc | 6798 | +{ |
6799 | + struct au_sbinfo *sbinfo; | |
6800 | + struct dentry *parent; | |
5afbbe0d | 6801 | + aufs_bindex_t bbot; |
062440b3 AM |
6802 | + |
6803 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
6804 | + return; | |
1facf9fc | 6805 | + |
6806 | + sbinfo = au_sbi(sb); | |
6807 | + parent = sbinfo->si_dbgaufs; | |
6808 | + if (!parent) | |
6809 | + return; | |
6810 | + | |
5afbbe0d | 6811 | + bbot = au_sbbot(sb); |
062440b3 AM |
6812 | + if (topdown) |
6813 | + for (; bindex <= bbot; bindex++) | |
6814 | + dbgaufs_br_add(sb, bindex, parent, sbinfo); | |
6815 | + else | |
6816 | + for (; bbot >= bindex; bbot--) | |
6817 | + dbgaufs_br_add(sb, bbot, parent, sbinfo); | |
1facf9fc | 6818 | +} |
6819 | + | |
6820 | +/* ---------------------------------------------------------------------- */ | |
6821 | + | |
6822 | +#ifdef CONFIG_AUFS_EXPORT | |
6823 | +static int dbgaufs_xigen_open(struct inode *inode, struct file *file) | |
6824 | +{ | |
6825 | + int err; | |
6826 | + struct au_sbinfo *sbinfo; | |
6827 | + struct super_block *sb; | |
6828 | + | |
6829 | + sbinfo = inode->i_private; | |
6830 | + sb = sbinfo->si_sb; | |
6831 | + si_noflush_read_lock(sb); | |
062440b3 | 6832 | + err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0, /*cnt*/0); |
1facf9fc | 6833 | + si_read_unlock(sb); |
6834 | + return err; | |
6835 | +} | |
6836 | + | |
6837 | +static const struct file_operations dbgaufs_xigen_fop = { | |
4a4d8108 | 6838 | + .owner = THIS_MODULE, |
1facf9fc | 6839 | + .open = dbgaufs_xigen_open, |
6840 | + .release = dbgaufs_xi_release, | |
6841 | + .read = dbgaufs_xi_read | |
6842 | +}; | |
6843 | + | |
6844 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
6845 | +{ | |
6846 | + int err; | |
6847 | + | |
dece6358 | 6848 | + /* |
c1595e42 | 6849 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
6850 | + * so the tiny check for si_rwsem is unnecessary. |
6851 | + */ | |
6852 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6853 | + | |
1facf9fc | 6854 | + err = -EIO; |
6855 | + sbinfo->si_dbgaufs_xigen = debugfs_create_file | |
6856 | + ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6857 | + &dbgaufs_xigen_fop); | |
6858 | + if (sbinfo->si_dbgaufs_xigen) | |
6859 | + err = 0; | |
6860 | + | |
6861 | + return err; | |
6862 | +} | |
6863 | +#else | |
6864 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
6865 | +{ | |
6866 | + return 0; | |
6867 | +} | |
6868 | +#endif /* CONFIG_AUFS_EXPORT */ | |
6869 | + | |
6870 | +/* ---------------------------------------------------------------------- */ | |
6871 | + | |
6872 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo) | |
6873 | +{ | |
dece6358 | 6874 | + /* |
7e9cd9fe | 6875 | + * This function is a dynamic '__fin' function actually, |
dece6358 AM |
6876 | + * so the tiny check for si_rwsem is unnecessary. |
6877 | + */ | |
6878 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6879 | + | |
1facf9fc | 6880 | + debugfs_remove_recursive(sbinfo->si_dbgaufs); |
6881 | + sbinfo->si_dbgaufs = NULL; | |
1facf9fc | 6882 | +} |
6883 | + | |
6884 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo) | |
6885 | +{ | |
6886 | + int err; | |
6887 | + char name[SysaufsSiNameLen]; | |
6888 | + | |
dece6358 | 6889 | + /* |
c1595e42 | 6890 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
6891 | + * so the tiny check for si_rwsem is unnecessary. |
6892 | + */ | |
6893 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6894 | + | |
1facf9fc | 6895 | + err = -ENOENT; |
6896 | + if (!dbgaufs) { | |
6897 | + AuErr1("/debug/aufs is uninitialized\n"); | |
6898 | + goto out; | |
6899 | + } | |
6900 | + | |
6901 | + err = -EIO; | |
6902 | + sysaufs_name(sbinfo, name); | |
6903 | + sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs); | |
6904 | + if (unlikely(!sbinfo->si_dbgaufs)) | |
6905 | + goto out; | |
1facf9fc | 6906 | + |
062440b3 | 6907 | + /* regardless plink/noplink option */ |
86dc4139 AM |
6908 | + sbinfo->si_dbgaufs_plink = debugfs_create_file |
6909 | + ("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6910 | + &dbgaufs_plink_fop); | |
6911 | + if (unlikely(!sbinfo->si_dbgaufs_plink)) | |
6912 | + goto out_dir; | |
6913 | + | |
062440b3 AM |
6914 | + /* regardless xino/noxino option */ |
6915 | + sbinfo->si_dbgaufs_xib = debugfs_create_file | |
6916 | + ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6917 | + &dbgaufs_xib_fop); | |
6918 | + if (unlikely(!sbinfo->si_dbgaufs_xib)) | |
6919 | + goto out_dir; | |
6920 | + | |
1facf9fc | 6921 | + err = dbgaufs_xigen_init(sbinfo); |
6922 | + if (!err) | |
6923 | + goto out; /* success */ | |
6924 | + | |
4f0767ce | 6925 | +out_dir: |
1facf9fc | 6926 | + dbgaufs_si_fin(sbinfo); |
4f0767ce | 6927 | +out: |
062440b3 AM |
6928 | + if (unlikely(err)) |
6929 | + pr_err("debugfs/aufs failed\n"); | |
1facf9fc | 6930 | + return err; |
6931 | +} | |
6932 | + | |
6933 | +/* ---------------------------------------------------------------------- */ | |
6934 | + | |
6935 | +void dbgaufs_fin(void) | |
6936 | +{ | |
6937 | + debugfs_remove(dbgaufs); | |
6938 | +} | |
6939 | + | |
6940 | +int __init dbgaufs_init(void) | |
6941 | +{ | |
6942 | + int err; | |
6943 | + | |
6944 | + err = -EIO; | |
6945 | + dbgaufs = debugfs_create_dir(AUFS_NAME, NULL); | |
6946 | + if (dbgaufs) | |
6947 | + err = 0; | |
6948 | + return err; | |
6949 | +} | |
7f207e10 | 6950 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.h linux/fs/aufs/dbgaufs.h |
eca34b5c | 6951 | --- /usr/share/empty/fs/aufs/dbgaufs.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 6952 | +++ linux/fs/aufs/dbgaufs.h 2020-01-27 10:57:18.168871450 +0100 |
062440b3 AM |
6953 | @@ -0,0 +1,53 @@ |
6954 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 6955 | +/* |
016522bc | 6956 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 6957 | + * |
6958 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6959 | + * it under the terms of the GNU General Public License as published by | |
6960 | + * the Free Software Foundation; either version 2 of the License, or | |
6961 | + * (at your option) any later version. | |
dece6358 AM |
6962 | + * |
6963 | + * This program is distributed in the hope that it will be useful, | |
6964 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6965 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6966 | + * GNU General Public License for more details. | |
6967 | + * | |
6968 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 6969 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 6970 | + */ |
6971 | + | |
6972 | +/* | |
6973 | + * debugfs interface | |
6974 | + */ | |
6975 | + | |
6976 | +#ifndef __DBGAUFS_H__ | |
6977 | +#define __DBGAUFS_H__ | |
6978 | + | |
6979 | +#ifdef __KERNEL__ | |
6980 | + | |
dece6358 | 6981 | +struct super_block; |
1facf9fc | 6982 | +struct au_sbinfo; |
062440b3 | 6983 | +struct au_branch; |
dece6358 | 6984 | + |
1facf9fc | 6985 | +#ifdef CONFIG_DEBUG_FS |
6986 | +/* dbgaufs.c */ | |
062440b3 | 6987 | +void dbgaufs_xino_del(struct au_branch *br); |
1facf9fc | 6988 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); |
062440b3 | 6989 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown); |
1facf9fc | 6990 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo); |
6991 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo); | |
6992 | +void dbgaufs_fin(void); | |
6993 | +int __init dbgaufs_init(void); | |
1facf9fc | 6994 | +#else |
062440b3 | 6995 | +AuStubVoid(dbgaufs_xino_del, struct au_branch *br) |
4a4d8108 | 6996 | +AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) |
062440b3 AM |
6997 | +AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex, |
6998 | + int topdown) | |
4a4d8108 AM |
6999 | +AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo) |
7000 | +AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo) | |
7001 | +AuStubVoid(dbgaufs_fin, void) | |
7002 | +AuStubInt0(__init dbgaufs_init, void) | |
1facf9fc | 7003 | +#endif /* CONFIG_DEBUG_FS */ |
7004 | + | |
7005 | +#endif /* __KERNEL__ */ | |
7006 | +#endif /* __DBGAUFS_H__ */ | |
7f207e10 | 7007 | diff -urN /usr/share/empty/fs/aufs/dcsub.c linux/fs/aufs/dcsub.c |
eca34b5c | 7008 | --- /usr/share/empty/fs/aufs/dcsub.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 7009 | +++ linux/fs/aufs/dcsub.c 2020-01-27 10:57:18.168871450 +0100 |
cd7a4cd9 AM |
7010 | @@ -0,0 +1,225 @@ |
7011 | +// SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 7012 | +/* |
016522bc | 7013 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 7014 | + * |
7015 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7016 | + * it under the terms of the GNU General Public License as published by | |
7017 | + * the Free Software Foundation; either version 2 of the License, or | |
7018 | + * (at your option) any later version. | |
dece6358 AM |
7019 | + * |
7020 | + * This program is distributed in the hope that it will be useful, | |
7021 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7022 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7023 | + * GNU General Public License for more details. | |
7024 | + * | |
7025 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7026 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7027 | + */ |
7028 | + | |
7029 | +/* | |
7030 | + * sub-routines for dentry cache | |
7031 | + */ | |
7032 | + | |
7033 | +#include "aufs.h" | |
7034 | + | |
7035 | +static void au_dpage_free(struct au_dpage *dpage) | |
7036 | +{ | |
7037 | + int i; | |
7038 | + struct dentry **p; | |
7039 | + | |
7040 | + p = dpage->dentries; | |
7041 | + for (i = 0; i < dpage->ndentry; i++) | |
7042 | + dput(*p++); | |
1c60b727 | 7043 | + free_page((unsigned long)dpage->dentries); |
1facf9fc | 7044 | +} |
7045 | + | |
7046 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp) | |
7047 | +{ | |
7048 | + int err; | |
7049 | + void *p; | |
7050 | + | |
7051 | + err = -ENOMEM; | |
7052 | + dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp); | |
7053 | + if (unlikely(!dpages->dpages)) | |
7054 | + goto out; | |
7055 | + | |
7056 | + p = (void *)__get_free_page(gfp); | |
7057 | + if (unlikely(!p)) | |
7058 | + goto out_dpages; | |
7059 | + | |
7060 | + dpages->dpages[0].ndentry = 0; | |
7061 | + dpages->dpages[0].dentries = p; | |
7062 | + dpages->ndpage = 1; | |
7063 | + return 0; /* success */ | |
7064 | + | |
4f0767ce | 7065 | +out_dpages: |
9f237c51 | 7066 | + au_kfree_try_rcu(dpages->dpages); |
4f0767ce | 7067 | +out: |
1facf9fc | 7068 | + return err; |
7069 | +} | |
7070 | + | |
7071 | +void au_dpages_free(struct au_dcsub_pages *dpages) | |
7072 | +{ | |
7073 | + int i; | |
7074 | + struct au_dpage *p; | |
7075 | + | |
7076 | + p = dpages->dpages; | |
7077 | + for (i = 0; i < dpages->ndpage; i++) | |
7078 | + au_dpage_free(p++); | |
9f237c51 | 7079 | + au_kfree_try_rcu(dpages->dpages); |
1facf9fc | 7080 | +} |
7081 | + | |
7082 | +static int au_dpages_append(struct au_dcsub_pages *dpages, | |
7083 | + struct dentry *dentry, gfp_t gfp) | |
7084 | +{ | |
7085 | + int err, sz; | |
7086 | + struct au_dpage *dpage; | |
7087 | + void *p; | |
7088 | + | |
7089 | + dpage = dpages->dpages + dpages->ndpage - 1; | |
7090 | + sz = PAGE_SIZE / sizeof(dentry); | |
7091 | + if (unlikely(dpage->ndentry >= sz)) { | |
7092 | + AuLabel(new dpage); | |
7093 | + err = -ENOMEM; | |
7094 | + sz = dpages->ndpage * sizeof(*dpages->dpages); | |
7095 | + p = au_kzrealloc(dpages->dpages, sz, | |
e2f27e51 AM |
7096 | + sz + sizeof(*dpages->dpages), gfp, |
7097 | + /*may_shrink*/0); | |
1facf9fc | 7098 | + if (unlikely(!p)) |
7099 | + goto out; | |
7100 | + | |
7101 | + dpages->dpages = p; | |
7102 | + dpage = dpages->dpages + dpages->ndpage; | |
7103 | + p = (void *)__get_free_page(gfp); | |
7104 | + if (unlikely(!p)) | |
7105 | + goto out; | |
7106 | + | |
7107 | + dpage->ndentry = 0; | |
7108 | + dpage->dentries = p; | |
7109 | + dpages->ndpage++; | |
7110 | + } | |
7111 | + | |
c1595e42 | 7112 | + AuDebugOn(au_dcount(dentry) <= 0); |
027c5e7a | 7113 | + dpage->dentries[dpage->ndentry++] = dget_dlock(dentry); |
1facf9fc | 7114 | + return 0; /* success */ |
7115 | + | |
4f0767ce | 7116 | +out: |
1facf9fc | 7117 | + return err; |
7118 | +} | |
7119 | + | |
c1595e42 JR |
7120 | +/* todo: BAD approach */ |
7121 | +/* copied from linux/fs/dcache.c */ | |
7122 | +enum d_walk_ret { | |
7123 | + D_WALK_CONTINUE, | |
7124 | + D_WALK_QUIT, | |
7125 | + D_WALK_NORETRY, | |
7126 | + D_WALK_SKIP, | |
7127 | +}; | |
7128 | + | |
7129 | +extern void d_walk(struct dentry *parent, void *data, | |
cd7a4cd9 | 7130 | + enum d_walk_ret (*enter)(void *, struct dentry *)); |
c1595e42 JR |
7131 | + |
7132 | +struct ac_dpages_arg { | |
1facf9fc | 7133 | + int err; |
c1595e42 JR |
7134 | + struct au_dcsub_pages *dpages; |
7135 | + struct super_block *sb; | |
7136 | + au_dpages_test test; | |
7137 | + void *arg; | |
7138 | +}; | |
1facf9fc | 7139 | + |
c1595e42 JR |
7140 | +static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry) |
7141 | +{ | |
7142 | + enum d_walk_ret ret; | |
7143 | + struct ac_dpages_arg *arg = _arg; | |
1facf9fc | 7144 | + |
c1595e42 JR |
7145 | + ret = D_WALK_CONTINUE; |
7146 | + if (dentry->d_sb == arg->sb | |
7147 | + && !IS_ROOT(dentry) | |
7148 | + && au_dcount(dentry) > 0 | |
7149 | + && au_di(dentry) | |
7150 | + && (!arg->test || arg->test(dentry, arg->arg))) { | |
7151 | + arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC); | |
7152 | + if (unlikely(arg->err)) | |
7153 | + ret = D_WALK_QUIT; | |
1facf9fc | 7154 | + } |
7155 | + | |
c1595e42 JR |
7156 | + return ret; |
7157 | +} | |
027c5e7a | 7158 | + |
c1595e42 JR |
7159 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, |
7160 | + au_dpages_test test, void *arg) | |
7161 | +{ | |
7162 | + struct ac_dpages_arg args = { | |
7163 | + .err = 0, | |
7164 | + .dpages = dpages, | |
7165 | + .sb = root->d_sb, | |
7166 | + .test = test, | |
7167 | + .arg = arg | |
7168 | + }; | |
027c5e7a | 7169 | + |
cd7a4cd9 | 7170 | + d_walk(root, &args, au_call_dpages_append); |
c1595e42 JR |
7171 | + |
7172 | + return args.err; | |
1facf9fc | 7173 | +} |
7174 | + | |
7175 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
7176 | + int do_include, au_dpages_test test, void *arg) | |
7177 | +{ | |
7178 | + int err; | |
7179 | + | |
7180 | + err = 0; | |
027c5e7a AM |
7181 | + write_seqlock(&rename_lock); |
7182 | + spin_lock(&dentry->d_lock); | |
7183 | + if (do_include | |
c1595e42 | 7184 | + && au_dcount(dentry) > 0 |
027c5e7a | 7185 | + && (!test || test(dentry, arg))) |
1facf9fc | 7186 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
7187 | + spin_unlock(&dentry->d_lock); |
7188 | + if (unlikely(err)) | |
7189 | + goto out; | |
7190 | + | |
7191 | + /* | |
523b37e3 | 7192 | + * RCU for vfsmount is unnecessary since this is a traverse in a single |
027c5e7a AM |
7193 | + * mount |
7194 | + */ | |
1facf9fc | 7195 | + while (!IS_ROOT(dentry)) { |
027c5e7a AM |
7196 | + dentry = dentry->d_parent; /* rename_lock is locked */ |
7197 | + spin_lock(&dentry->d_lock); | |
c1595e42 | 7198 | + if (au_dcount(dentry) > 0 |
027c5e7a | 7199 | + && (!test || test(dentry, arg))) |
1facf9fc | 7200 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
7201 | + spin_unlock(&dentry->d_lock); |
7202 | + if (unlikely(err)) | |
7203 | + break; | |
1facf9fc | 7204 | + } |
7205 | + | |
4f0767ce | 7206 | +out: |
027c5e7a | 7207 | + write_sequnlock(&rename_lock); |
1facf9fc | 7208 | + return err; |
7209 | +} | |
7210 | + | |
027c5e7a AM |
7211 | +static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg) |
7212 | +{ | |
7213 | + return au_di(dentry) && dentry->d_sb == arg; | |
7214 | +} | |
7215 | + | |
7216 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, | |
7217 | + struct dentry *dentry, int do_include) | |
7218 | +{ | |
7219 | + return au_dcsub_pages_rev(dpages, dentry, do_include, | |
7220 | + au_dcsub_dpages_aufs, dentry->d_sb); | |
7221 | +} | |
7222 | + | |
4a4d8108 | 7223 | +int au_test_subdir(struct dentry *d1, struct dentry *d2) |
1facf9fc | 7224 | +{ |
4a4d8108 AM |
7225 | + struct path path[2] = { |
7226 | + { | |
7227 | + .dentry = d1 | |
7228 | + }, | |
7229 | + { | |
7230 | + .dentry = d2 | |
7231 | + } | |
7232 | + }; | |
1facf9fc | 7233 | + |
4a4d8108 | 7234 | + return path_is_under(path + 0, path + 1); |
1facf9fc | 7235 | +} |
7f207e10 | 7236 | diff -urN /usr/share/empty/fs/aufs/dcsub.h linux/fs/aufs/dcsub.h |
eca34b5c | 7237 | --- /usr/share/empty/fs/aufs/dcsub.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 7238 | +++ linux/fs/aufs/dcsub.h 2020-01-27 10:57:18.168871450 +0100 |
062440b3 AM |
7239 | @@ -0,0 +1,137 @@ |
7240 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 7241 | +/* |
016522bc | 7242 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 7243 | + * |
7244 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7245 | + * it under the terms of the GNU General Public License as published by | |
7246 | + * the Free Software Foundation; either version 2 of the License, or | |
7247 | + * (at your option) any later version. | |
dece6358 AM |
7248 | + * |
7249 | + * This program is distributed in the hope that it will be useful, | |
7250 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7251 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7252 | + * GNU General Public License for more details. | |
7253 | + * | |
7254 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7255 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7256 | + */ |
7257 | + | |
7258 | +/* | |
7259 | + * sub-routines for dentry cache | |
7260 | + */ | |
7261 | + | |
7262 | +#ifndef __AUFS_DCSUB_H__ | |
7263 | +#define __AUFS_DCSUB_H__ | |
7264 | + | |
7265 | +#ifdef __KERNEL__ | |
7266 | + | |
7f207e10 | 7267 | +#include <linux/dcache.h> |
027c5e7a | 7268 | +#include <linux/fs.h> |
dece6358 | 7269 | + |
1facf9fc | 7270 | +struct au_dpage { |
7271 | + int ndentry; | |
7272 | + struct dentry **dentries; | |
7273 | +}; | |
7274 | + | |
7275 | +struct au_dcsub_pages { | |
7276 | + int ndpage; | |
7277 | + struct au_dpage *dpages; | |
7278 | +}; | |
7279 | + | |
7280 | +/* ---------------------------------------------------------------------- */ | |
7281 | + | |
7f207e10 | 7282 | +/* dcsub.c */ |
1facf9fc | 7283 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); |
7284 | +void au_dpages_free(struct au_dcsub_pages *dpages); | |
7285 | +typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); | |
7286 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
7287 | + au_dpages_test test, void *arg); | |
7288 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
7289 | + int do_include, au_dpages_test test, void *arg); | |
027c5e7a AM |
7290 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, |
7291 | + struct dentry *dentry, int do_include); | |
4a4d8108 | 7292 | +int au_test_subdir(struct dentry *d1, struct dentry *d2); |
1facf9fc | 7293 | + |
7f207e10 AM |
7294 | +/* ---------------------------------------------------------------------- */ |
7295 | + | |
523b37e3 AM |
7296 | +/* |
7297 | + * todo: in linux-3.13, several similar (but faster) helpers are added to | |
7298 | + * include/linux/dcache.h. Try them (in the future). | |
7299 | + */ | |
7300 | + | |
027c5e7a AM |
7301 | +static inline int au_d_hashed_positive(struct dentry *d) |
7302 | +{ | |
7303 | + int err; | |
5527c038 | 7304 | + struct inode *inode = d_inode(d); |
076b876e | 7305 | + |
027c5e7a | 7306 | + err = 0; |
5527c038 JR |
7307 | + if (unlikely(d_unhashed(d) |
7308 | + || d_is_negative(d) | |
7309 | + || !inode->i_nlink)) | |
027c5e7a AM |
7310 | + err = -ENOENT; |
7311 | + return err; | |
7312 | +} | |
7313 | + | |
38d290e6 JR |
7314 | +static inline int au_d_linkable(struct dentry *d) |
7315 | +{ | |
7316 | + int err; | |
5527c038 | 7317 | + struct inode *inode = d_inode(d); |
076b876e | 7318 | + |
38d290e6 JR |
7319 | + err = au_d_hashed_positive(d); |
7320 | + if (err | |
5527c038 | 7321 | + && d_is_positive(d) |
38d290e6 JR |
7322 | + && (inode->i_state & I_LINKABLE)) |
7323 | + err = 0; | |
7324 | + return err; | |
7325 | +} | |
7326 | + | |
027c5e7a AM |
7327 | +static inline int au_d_alive(struct dentry *d) |
7328 | +{ | |
7329 | + int err; | |
7330 | + struct inode *inode; | |
076b876e | 7331 | + |
027c5e7a AM |
7332 | + err = 0; |
7333 | + if (!IS_ROOT(d)) | |
7334 | + err = au_d_hashed_positive(d); | |
7335 | + else { | |
5527c038 JR |
7336 | + inode = d_inode(d); |
7337 | + if (unlikely(d_unlinked(d) | |
7338 | + || d_is_negative(d) | |
7339 | + || !inode->i_nlink)) | |
027c5e7a AM |
7340 | + err = -ENOENT; |
7341 | + } | |
7342 | + return err; | |
7343 | +} | |
7344 | + | |
7345 | +static inline int au_alive_dir(struct dentry *d) | |
7f207e10 | 7346 | +{ |
027c5e7a | 7347 | + int err; |
076b876e | 7348 | + |
027c5e7a | 7349 | + err = au_d_alive(d); |
5527c038 | 7350 | + if (unlikely(err || IS_DEADDIR(d_inode(d)))) |
027c5e7a AM |
7351 | + err = -ENOENT; |
7352 | + return err; | |
7f207e10 AM |
7353 | +} |
7354 | + | |
38d290e6 JR |
7355 | +static inline int au_qstreq(struct qstr *a, struct qstr *b) |
7356 | +{ | |
7357 | + return a->len == b->len | |
7358 | + && !memcmp(a->name, b->name, a->len); | |
7359 | +} | |
7360 | + | |
7e9cd9fe AM |
7361 | +/* |
7362 | + * by the commit | |
7363 | + * 360f547 2015-01-25 dcache: let the dentry count go down to zero without | |
7364 | + * taking d_lock | |
7365 | + * the type of d_lockref.count became int, but the inlined function d_count() | |
7366 | + * still returns unsigned int. | |
7367 | + * I don't know why. Maybe it is for every d_count() users? | |
7368 | + * Anyway au_dcount() lives on. | |
7369 | + */ | |
c1595e42 JR |
7370 | +static inline int au_dcount(struct dentry *d) |
7371 | +{ | |
7372 | + return (int)d_count(d); | |
7373 | +} | |
7374 | + | |
1facf9fc | 7375 | +#endif /* __KERNEL__ */ |
7376 | +#endif /* __AUFS_DCSUB_H__ */ | |
7f207e10 | 7377 | diff -urN /usr/share/empty/fs/aufs/debug.c linux/fs/aufs/debug.c |
eca34b5c | 7378 | --- /usr/share/empty/fs/aufs/debug.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 7379 | +++ linux/fs/aufs/debug.c 2020-01-27 10:57:18.168871450 +0100 |
eca801bf | 7380 | @@ -0,0 +1,441 @@ |
cd7a4cd9 | 7381 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 7382 | +/* |
016522bc | 7383 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 7384 | + * |
7385 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7386 | + * it under the terms of the GNU General Public License as published by | |
7387 | + * the Free Software Foundation; either version 2 of the License, or | |
7388 | + * (at your option) any later version. | |
dece6358 AM |
7389 | + * |
7390 | + * This program is distributed in the hope that it will be useful, | |
7391 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7392 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7393 | + * GNU General Public License for more details. | |
7394 | + * | |
7395 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7396 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7397 | + */ |
7398 | + | |
7399 | +/* | |
7400 | + * debug print functions | |
7401 | + */ | |
7402 | + | |
eca801bf | 7403 | +#include <linux/iversion.h> |
1facf9fc | 7404 | +#include "aufs.h" |
7405 | + | |
392086de AM |
7406 | +/* Returns 0, or -errno. arg is in kp->arg. */ |
7407 | +static int param_atomic_t_set(const char *val, const struct kernel_param *kp) | |
7408 | +{ | |
7409 | + int err, n; | |
7410 | + | |
7411 | + err = kstrtoint(val, 0, &n); | |
7412 | + if (!err) { | |
7413 | + if (n > 0) | |
7414 | + au_debug_on(); | |
7415 | + else | |
7416 | + au_debug_off(); | |
7417 | + } | |
7418 | + return err; | |
7419 | +} | |
7420 | + | |
7421 | +/* Returns length written or -errno. Buffer is 4k (ie. be short!) */ | |
7422 | +static int param_atomic_t_get(char *buffer, const struct kernel_param *kp) | |
7423 | +{ | |
7424 | + atomic_t *a; | |
7425 | + | |
7426 | + a = kp->arg; | |
7427 | + return sprintf(buffer, "%d", atomic_read(a)); | |
7428 | +} | |
7429 | + | |
7430 | +static struct kernel_param_ops param_ops_atomic_t = { | |
7431 | + .set = param_atomic_t_set, | |
7432 | + .get = param_atomic_t_get | |
7433 | + /* void (*free)(void *arg) */ | |
7434 | +}; | |
7435 | + | |
7436 | +atomic_t aufs_debug = ATOMIC_INIT(0); | |
1facf9fc | 7437 | +MODULE_PARM_DESC(debug, "debug print"); |
cd7a4cd9 | 7438 | +module_param_named(debug, aufs_debug, atomic_t, 0664); |
1facf9fc | 7439 | + |
c1595e42 | 7440 | +DEFINE_MUTEX(au_dbg_mtx); /* just to serialize the dbg msgs */ |
1facf9fc | 7441 | +char *au_plevel = KERN_DEBUG; |
e49829fe JR |
7442 | +#define dpri(fmt, ...) do { \ |
7443 | + if ((au_plevel \ | |
7444 | + && strcmp(au_plevel, KERN_DEBUG)) \ | |
7445 | + || au_debug_test()) \ | |
7446 | + printk("%s" fmt, au_plevel, ##__VA_ARGS__); \ | |
1facf9fc | 7447 | +} while (0) |
7448 | + | |
7449 | +/* ---------------------------------------------------------------------- */ | |
7450 | + | |
7451 | +void au_dpri_whlist(struct au_nhash *whlist) | |
7452 | +{ | |
7453 | + unsigned long ul, n; | |
7454 | + struct hlist_head *head; | |
c06a8ce3 | 7455 | + struct au_vdir_wh *pos; |
1facf9fc | 7456 | + |
7457 | + n = whlist->nh_num; | |
7458 | + head = whlist->nh_head; | |
7459 | + for (ul = 0; ul < n; ul++) { | |
c06a8ce3 | 7460 | + hlist_for_each_entry(pos, head, wh_hash) |
1facf9fc | 7461 | + dpri("b%d, %.*s, %d\n", |
c06a8ce3 AM |
7462 | + pos->wh_bindex, |
7463 | + pos->wh_str.len, pos->wh_str.name, | |
7464 | + pos->wh_str.len); | |
1facf9fc | 7465 | + head++; |
7466 | + } | |
7467 | +} | |
7468 | + | |
7469 | +void au_dpri_vdir(struct au_vdir *vdir) | |
7470 | +{ | |
7471 | + unsigned long ul; | |
7472 | + union au_vdir_deblk_p p; | |
7473 | + unsigned char *o; | |
7474 | + | |
7475 | + if (!vdir || IS_ERR(vdir)) { | |
7476 | + dpri("err %ld\n", PTR_ERR(vdir)); | |
7477 | + return; | |
7478 | + } | |
7479 | + | |
be118d29 | 7480 | + dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %llu\n", |
1facf9fc | 7481 | + vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk, |
7482 | + vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version); | |
7483 | + for (ul = 0; ul < vdir->vd_nblk; ul++) { | |
7484 | + p.deblk = vdir->vd_deblk[ul]; | |
7485 | + o = p.deblk; | |
7486 | + dpri("[%lu]: %p\n", ul, o); | |
7487 | + } | |
7488 | +} | |
7489 | + | |
53392da6 | 7490 | +static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn, |
1facf9fc | 7491 | + struct dentry *wh) |
7492 | +{ | |
7493 | + char *n = NULL; | |
7494 | + int l = 0; | |
7495 | + | |
7496 | + if (!inode || IS_ERR(inode)) { | |
7497 | + dpri("i%d: err %ld\n", bindex, PTR_ERR(inode)); | |
7498 | + return -1; | |
7499 | + } | |
7500 | + | |
c2b27bf2 | 7501 | + /* the type of i_blocks depends upon CONFIG_LBDAF */ |
1facf9fc | 7502 | + BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long) |
7503 | + && sizeof(inode->i_blocks) != sizeof(u64)); | |
7504 | + if (wh) { | |
7505 | + n = (void *)wh->d_name.name; | |
7506 | + l = wh->d_name.len; | |
7507 | + } | |
7508 | + | |
53392da6 AM |
7509 | + dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu," |
7510 | + " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n", | |
7511 | + bindex, inode, | |
1facf9fc | 7512 | + inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??", |
7513 | + atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode, | |
7514 | + i_size_read(inode), (unsigned long long)inode->i_blocks, | |
cd7a4cd9 | 7515 | + hn, (long long)timespec64_to_ns(&inode->i_ctime) & 0x0ffff, |
1facf9fc | 7516 | + inode->i_mapping ? inode->i_mapping->nrpages : 0, |
be118d29 | 7517 | + inode->i_state, inode->i_flags, inode_peek_iversion(inode), |
b752ccd1 | 7518 | + inode->i_generation, |
1facf9fc | 7519 | + l ? ", wh " : "", l, n); |
7520 | + return 0; | |
7521 | +} | |
7522 | + | |
7523 | +void au_dpri_inode(struct inode *inode) | |
7524 | +{ | |
7525 | + struct au_iinfo *iinfo; | |
5afbbe0d | 7526 | + struct au_hinode *hi; |
1facf9fc | 7527 | + aufs_bindex_t bindex; |
53392da6 | 7528 | + int err, hn; |
1facf9fc | 7529 | + |
53392da6 | 7530 | + err = do_pri_inode(-1, inode, -1, NULL); |
5afbbe0d | 7531 | + if (err || !au_test_aufs(inode->i_sb) || au_is_bad_inode(inode)) |
1facf9fc | 7532 | + return; |
7533 | + | |
7534 | + iinfo = au_ii(inode); | |
5afbbe0d AM |
7535 | + dpri("i-1: btop %d, bbot %d, gen %d\n", |
7536 | + iinfo->ii_btop, iinfo->ii_bbot, au_iigen(inode, NULL)); | |
7537 | + if (iinfo->ii_btop < 0) | |
1facf9fc | 7538 | + return; |
53392da6 | 7539 | + hn = 0; |
5afbbe0d AM |
7540 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; bindex++) { |
7541 | + hi = au_hinode(iinfo, bindex); | |
7542 | + hn = !!au_hn(hi); | |
7543 | + do_pri_inode(bindex, hi->hi_inode, hn, hi->hi_whdentry); | |
53392da6 | 7544 | + } |
1facf9fc | 7545 | +} |
7546 | + | |
2cbb1c4b JR |
7547 | +void au_dpri_dalias(struct inode *inode) |
7548 | +{ | |
7549 | + struct dentry *d; | |
7550 | + | |
7551 | + spin_lock(&inode->i_lock); | |
c1595e42 | 7552 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) |
2cbb1c4b JR |
7553 | + au_dpri_dentry(d); |
7554 | + spin_unlock(&inode->i_lock); | |
7555 | +} | |
7556 | + | |
1facf9fc | 7557 | +static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry) |
7558 | +{ | |
7559 | + struct dentry *wh = NULL; | |
53392da6 | 7560 | + int hn; |
5afbbe0d | 7561 | + struct inode *inode; |
076b876e | 7562 | + struct au_iinfo *iinfo; |
5afbbe0d | 7563 | + struct au_hinode *hi; |
1facf9fc | 7564 | + |
7565 | + if (!dentry || IS_ERR(dentry)) { | |
7566 | + dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry)); | |
7567 | + return -1; | |
7568 | + } | |
7569 | + /* do not call dget_parent() here */ | |
027c5e7a | 7570 | + /* note: access d_xxx without d_lock */ |
523b37e3 AM |
7571 | + dpri("d%d: %p, %pd2?, %s, cnt %d, flags 0x%x, %shashed\n", |
7572 | + bindex, dentry, dentry, | |
1facf9fc | 7573 | + dentry->d_sb ? au_sbtype(dentry->d_sb) : "??", |
c1595e42 | 7574 | + au_dcount(dentry), dentry->d_flags, |
523b37e3 | 7575 | + d_unhashed(dentry) ? "un" : ""); |
53392da6 | 7576 | + hn = -1; |
5afbbe0d AM |
7577 | + inode = NULL; |
7578 | + if (d_is_positive(dentry)) | |
7579 | + inode = d_inode(dentry); | |
7580 | + if (inode | |
7581 | + && au_test_aufs(dentry->d_sb) | |
7582 | + && bindex >= 0 | |
7583 | + && !au_is_bad_inode(inode)) { | |
7584 | + iinfo = au_ii(inode); | |
7585 | + hi = au_hinode(iinfo, bindex); | |
7586 | + hn = !!au_hn(hi); | |
7587 | + wh = hi->hi_whdentry; | |
7588 | + } | |
7589 | + do_pri_inode(bindex, inode, hn, wh); | |
1facf9fc | 7590 | + return 0; |
7591 | +} | |
7592 | + | |
7593 | +void au_dpri_dentry(struct dentry *dentry) | |
7594 | +{ | |
7595 | + struct au_dinfo *dinfo; | |
7596 | + aufs_bindex_t bindex; | |
7597 | + int err; | |
7598 | + | |
7599 | + err = do_pri_dentry(-1, dentry); | |
7600 | + if (err || !au_test_aufs(dentry->d_sb)) | |
7601 | + return; | |
7602 | + | |
7603 | + dinfo = au_di(dentry); | |
7604 | + if (!dinfo) | |
7605 | + return; | |
5afbbe0d AM |
7606 | + dpri("d-1: btop %d, bbot %d, bwh %d, bdiropq %d, gen %d, tmp %d\n", |
7607 | + dinfo->di_btop, dinfo->di_bbot, | |
38d290e6 JR |
7608 | + dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry), |
7609 | + dinfo->di_tmpfile); | |
5afbbe0d | 7610 | + if (dinfo->di_btop < 0) |
1facf9fc | 7611 | + return; |
5afbbe0d AM |
7612 | + for (bindex = dinfo->di_btop; bindex <= dinfo->di_bbot; bindex++) |
7613 | + do_pri_dentry(bindex, au_hdentry(dinfo, bindex)->hd_dentry); | |
1facf9fc | 7614 | +} |
7615 | + | |
7616 | +static int do_pri_file(aufs_bindex_t bindex, struct file *file) | |
7617 | +{ | |
7618 | + char a[32]; | |
7619 | + | |
7620 | + if (!file || IS_ERR(file)) { | |
7621 | + dpri("f%d: err %ld\n", bindex, PTR_ERR(file)); | |
7622 | + return -1; | |
7623 | + } | |
7624 | + a[0] = 0; | |
7625 | + if (bindex < 0 | |
b912730e | 7626 | + && !IS_ERR_OR_NULL(file->f_path.dentry) |
2000de60 | 7627 | + && au_test_aufs(file->f_path.dentry->d_sb) |
1facf9fc | 7628 | + && au_fi(file)) |
e49829fe | 7629 | + snprintf(a, sizeof(a), ", gen %d, mmapped %d", |
2cbb1c4b | 7630 | + au_figen(file), atomic_read(&au_fi(file)->fi_mmapped)); |
b752ccd1 | 7631 | + dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n", |
1facf9fc | 7632 | + bindex, file->f_mode, file->f_flags, (long)file_count(file), |
b752ccd1 | 7633 | + file->f_version, file->f_pos, a); |
b912730e | 7634 | + if (!IS_ERR_OR_NULL(file->f_path.dentry)) |
2000de60 | 7635 | + do_pri_dentry(bindex, file->f_path.dentry); |
1facf9fc | 7636 | + return 0; |
7637 | +} | |
7638 | + | |
7639 | +void au_dpri_file(struct file *file) | |
7640 | +{ | |
7641 | + struct au_finfo *finfo; | |
4a4d8108 AM |
7642 | + struct au_fidir *fidir; |
7643 | + struct au_hfile *hfile; | |
1facf9fc | 7644 | + aufs_bindex_t bindex; |
7645 | + int err; | |
7646 | + | |
7647 | + err = do_pri_file(-1, file); | |
2000de60 | 7648 | + if (err |
b912730e | 7649 | + || IS_ERR_OR_NULL(file->f_path.dentry) |
2000de60 | 7650 | + || !au_test_aufs(file->f_path.dentry->d_sb)) |
1facf9fc | 7651 | + return; |
7652 | + | |
7653 | + finfo = au_fi(file); | |
7654 | + if (!finfo) | |
7655 | + return; | |
4a4d8108 | 7656 | + if (finfo->fi_btop < 0) |
1facf9fc | 7657 | + return; |
4a4d8108 AM |
7658 | + fidir = finfo->fi_hdir; |
7659 | + if (!fidir) | |
7660 | + do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file); | |
7661 | + else | |
e49829fe JR |
7662 | + for (bindex = finfo->fi_btop; |
7663 | + bindex >= 0 && bindex <= fidir->fd_bbot; | |
4a4d8108 AM |
7664 | + bindex++) { |
7665 | + hfile = fidir->fd_hfile + bindex; | |
7666 | + do_pri_file(bindex, hfile ? hfile->hf_file : NULL); | |
7667 | + } | |
1facf9fc | 7668 | +} |
7669 | + | |
7670 | +static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br) | |
7671 | +{ | |
7672 | + struct vfsmount *mnt; | |
7673 | + struct super_block *sb; | |
7674 | + | |
7675 | + if (!br || IS_ERR(br)) | |
7676 | + goto out; | |
86dc4139 | 7677 | + mnt = au_br_mnt(br); |
1facf9fc | 7678 | + if (!mnt || IS_ERR(mnt)) |
7679 | + goto out; | |
7680 | + sb = mnt->mnt_sb; | |
7681 | + if (!sb || IS_ERR(sb)) | |
7682 | + goto out; | |
7683 | + | |
acd2b654 | 7684 | + dpri("s%d: {perm 0x%x, id %d, wbr %p}, " |
b752ccd1 | 7685 | + "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, " |
1facf9fc | 7686 | + "xino %d\n", |
acd2b654 AM |
7687 | + bindex, br->br_perm, br->br_id, br->br_wbr, |
7688 | + au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev), | |
b752ccd1 | 7689 | + sb->s_flags, sb->s_count, |
acd2b654 AM |
7690 | + atomic_read(&sb->s_active), |
7691 | + !!au_xino_file(br->br_xino, /*idx*/-1)); | |
1facf9fc | 7692 | + return 0; |
7693 | + | |
4f0767ce | 7694 | +out: |
1facf9fc | 7695 | + dpri("s%d: err %ld\n", bindex, PTR_ERR(br)); |
7696 | + return -1; | |
7697 | +} | |
7698 | + | |
7699 | +void au_dpri_sb(struct super_block *sb) | |
7700 | +{ | |
7701 | + struct au_sbinfo *sbinfo; | |
7702 | + aufs_bindex_t bindex; | |
7703 | + int err; | |
acd2b654 | 7704 | + /* to reduce stack size */ |
1facf9fc | 7705 | + struct { |
7706 | + struct vfsmount mnt; | |
7707 | + struct au_branch fake; | |
7708 | + } *a; | |
7709 | + | |
7710 | + /* this function can be called from magic sysrq */ | |
7711 | + a = kzalloc(sizeof(*a), GFP_ATOMIC); | |
7712 | + if (unlikely(!a)) { | |
7713 | + dpri("no memory\n"); | |
7714 | + return; | |
7715 | + } | |
7716 | + | |
7717 | + a->mnt.mnt_sb = sb; | |
86dc4139 | 7718 | + a->fake.br_path.mnt = &a->mnt; |
1facf9fc | 7719 | + err = do_pri_br(-1, &a->fake); |
9f237c51 | 7720 | + au_kfree_rcu(a); |
1facf9fc | 7721 | + dpri("dev 0x%x\n", sb->s_dev); |
7722 | + if (err || !au_test_aufs(sb)) | |
7723 | + return; | |
7724 | + | |
7725 | + sbinfo = au_sbi(sb); | |
7726 | + if (!sbinfo) | |
7727 | + return; | |
f0c0a007 AM |
7728 | + dpri("nw %d, gen %u, kobj %d\n", |
7729 | + atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation, | |
521ced18 | 7730 | + kref_read(&sbinfo->si_kobj.kref)); |
5afbbe0d | 7731 | + for (bindex = 0; bindex <= sbinfo->si_bbot; bindex++) |
1facf9fc | 7732 | + do_pri_br(bindex, sbinfo->si_branch[0 + bindex]); |
7733 | +} | |
7734 | + | |
7735 | +/* ---------------------------------------------------------------------- */ | |
7736 | + | |
027c5e7a AM |
7737 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line) |
7738 | +{ | |
5527c038 | 7739 | + struct inode *h_inode, *inode = d_inode(dentry); |
027c5e7a | 7740 | + struct dentry *h_dentry; |
5afbbe0d | 7741 | + aufs_bindex_t bindex, bbot, bi; |
027c5e7a AM |
7742 | + |
7743 | + if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */) | |
7744 | + return; | |
7745 | + | |
5afbbe0d AM |
7746 | + bbot = au_dbbot(dentry); |
7747 | + bi = au_ibbot(inode); | |
7748 | + if (bi < bbot) | |
7749 | + bbot = bi; | |
7750 | + bindex = au_dbtop(dentry); | |
7751 | + bi = au_ibtop(inode); | |
027c5e7a AM |
7752 | + if (bi > bindex) |
7753 | + bindex = bi; | |
7754 | + | |
5afbbe0d | 7755 | + for (; bindex <= bbot; bindex++) { |
027c5e7a AM |
7756 | + h_dentry = au_h_dptr(dentry, bindex); |
7757 | + if (!h_dentry) | |
7758 | + continue; | |
7759 | + h_inode = au_h_iptr(inode, bindex); | |
5527c038 | 7760 | + if (unlikely(h_inode != d_inode(h_dentry))) { |
392086de | 7761 | + au_debug_on(); |
027c5e7a AM |
7762 | + AuDbg("b%d, %s:%d\n", bindex, func, line); |
7763 | + AuDbgDentry(dentry); | |
7764 | + AuDbgInode(inode); | |
392086de | 7765 | + au_debug_off(); |
027c5e7a AM |
7766 | + BUG(); |
7767 | + } | |
7768 | + } | |
7769 | +} | |
7770 | + | |
1facf9fc | 7771 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen) |
7772 | +{ | |
7773 | + int err, i, j; | |
7774 | + struct au_dcsub_pages dpages; | |
7775 | + struct au_dpage *dpage; | |
7776 | + struct dentry **dentries; | |
7777 | + | |
7778 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
7779 | + AuDebugOn(err); | |
027c5e7a | 7780 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1); |
1facf9fc | 7781 | + AuDebugOn(err); |
7782 | + for (i = dpages.ndpage - 1; !err && i >= 0; i--) { | |
7783 | + dpage = dpages.dpages + i; | |
7784 | + dentries = dpage->dentries; | |
7785 | + for (j = dpage->ndentry - 1; !err && j >= 0; j--) | |
027c5e7a | 7786 | + AuDebugOn(au_digen_test(dentries[j], sigen)); |
1facf9fc | 7787 | + } |
7788 | + au_dpages_free(&dpages); | |
7789 | +} | |
7790 | + | |
1facf9fc | 7791 | +void au_dbg_verify_kthread(void) |
7792 | +{ | |
53392da6 | 7793 | + if (au_wkq_test()) { |
1facf9fc | 7794 | + au_dbg_blocked(); |
1e00d052 AM |
7795 | + /* |
7796 | + * It may be recursive, but udba=notify between two aufs mounts, | |
7797 | + * where a single ro branch is shared, is not a problem. | |
7798 | + */ | |
7799 | + /* WARN_ON(1); */ | |
1facf9fc | 7800 | + } |
7801 | +} | |
7802 | + | |
7803 | +/* ---------------------------------------------------------------------- */ | |
7804 | + | |
1facf9fc | 7805 | +int __init au_debug_init(void) |
7806 | +{ | |
7807 | + aufs_bindex_t bindex; | |
7808 | + struct au_vdir_destr destr; | |
7809 | + | |
7810 | + bindex = -1; | |
7811 | + AuDebugOn(bindex >= 0); | |
7812 | + | |
7813 | + destr.len = -1; | |
7814 | + AuDebugOn(destr.len < NAME_MAX); | |
7815 | + | |
7816 | +#ifdef CONFIG_4KSTACKS | |
0c3ec466 | 7817 | + pr_warn("CONFIG_4KSTACKS is defined.\n"); |
1facf9fc | 7818 | +#endif |
7819 | + | |
1facf9fc | 7820 | + return 0; |
7821 | +} | |
7f207e10 | 7822 | diff -urN /usr/share/empty/fs/aufs/debug.h linux/fs/aufs/debug.h |
eca34b5c | 7823 | --- /usr/share/empty/fs/aufs/debug.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 7824 | +++ linux/fs/aufs/debug.h 2020-01-27 10:57:18.168871450 +0100 |
062440b3 AM |
7825 | @@ -0,0 +1,226 @@ |
7826 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 7827 | +/* |
016522bc | 7828 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 7829 | + * |
7830 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7831 | + * it under the terms of the GNU General Public License as published by | |
7832 | + * the Free Software Foundation; either version 2 of the License, or | |
7833 | + * (at your option) any later version. | |
dece6358 AM |
7834 | + * |
7835 | + * This program is distributed in the hope that it will be useful, | |
7836 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7837 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7838 | + * GNU General Public License for more details. | |
7839 | + * | |
7840 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7841 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7842 | + */ |
7843 | + | |
7844 | +/* | |
7845 | + * debug print functions | |
7846 | + */ | |
7847 | + | |
7848 | +#ifndef __AUFS_DEBUG_H__ | |
7849 | +#define __AUFS_DEBUG_H__ | |
7850 | + | |
7851 | +#ifdef __KERNEL__ | |
7852 | + | |
392086de | 7853 | +#include <linux/atomic.h> |
4a4d8108 AM |
7854 | +#include <linux/module.h> |
7855 | +#include <linux/kallsyms.h> | |
1facf9fc | 7856 | +#include <linux/sysrq.h> |
4a4d8108 | 7857 | + |
1facf9fc | 7858 | +#ifdef CONFIG_AUFS_DEBUG |
7859 | +#define AuDebugOn(a) BUG_ON(a) | |
7860 | + | |
7861 | +/* module parameter */ | |
392086de AM |
7862 | +extern atomic_t aufs_debug; |
7863 | +static inline void au_debug_on(void) | |
1facf9fc | 7864 | +{ |
392086de AM |
7865 | + atomic_inc(&aufs_debug); |
7866 | +} | |
7867 | +static inline void au_debug_off(void) | |
7868 | +{ | |
7869 | + atomic_dec_if_positive(&aufs_debug); | |
1facf9fc | 7870 | +} |
7871 | + | |
7872 | +static inline int au_debug_test(void) | |
7873 | +{ | |
392086de | 7874 | + return atomic_read(&aufs_debug) > 0; |
1facf9fc | 7875 | +} |
7876 | +#else | |
7877 | +#define AuDebugOn(a) do {} while (0) | |
392086de AM |
7878 | +AuStubVoid(au_debug_on, void) |
7879 | +AuStubVoid(au_debug_off, void) | |
4a4d8108 | 7880 | +AuStubInt0(au_debug_test, void) |
1facf9fc | 7881 | +#endif /* CONFIG_AUFS_DEBUG */ |
7882 | + | |
392086de AM |
7883 | +#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t) |
7884 | + | |
1facf9fc | 7885 | +/* ---------------------------------------------------------------------- */ |
7886 | + | |
7887 | +/* debug print */ | |
7888 | + | |
4a4d8108 | 7889 | +#define AuDbg(fmt, ...) do { \ |
1facf9fc | 7890 | + if (au_debug_test()) \ |
4a4d8108 | 7891 | + pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \ |
1facf9fc | 7892 | +} while (0) |
4a4d8108 AM |
7893 | +#define AuLabel(l) AuDbg(#l "\n") |
7894 | +#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__) | |
7895 | +#define AuWarn1(fmt, ...) do { \ | |
1facf9fc | 7896 | + static unsigned char _c; \ |
7897 | + if (!_c++) \ | |
0c3ec466 | 7898 | + pr_warn(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7899 | +} while (0) |
7900 | + | |
4a4d8108 | 7901 | +#define AuErr1(fmt, ...) do { \ |
1facf9fc | 7902 | + static unsigned char _c; \ |
7903 | + if (!_c++) \ | |
4a4d8108 | 7904 | + pr_err(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7905 | +} while (0) |
7906 | + | |
4a4d8108 | 7907 | +#define AuIOErr1(fmt, ...) do { \ |
1facf9fc | 7908 | + static unsigned char _c; \ |
7909 | + if (!_c++) \ | |
4a4d8108 | 7910 | + AuIOErr(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7911 | +} while (0) |
7912 | + | |
7913 | +#define AuUnsupportMsg "This operation is not supported." \ | |
7914 | + " Please report this application to aufs-users ML." | |
4a4d8108 AM |
7915 | +#define AuUnsupport(fmt, ...) do { \ |
7916 | + pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \ | |
1facf9fc | 7917 | + dump_stack(); \ |
7918 | +} while (0) | |
7919 | + | |
7920 | +#define AuTraceErr(e) do { \ | |
7921 | + if (unlikely((e) < 0)) \ | |
7922 | + AuDbg("err %d\n", (int)(e)); \ | |
7923 | +} while (0) | |
7924 | + | |
7925 | +#define AuTraceErrPtr(p) do { \ | |
7926 | + if (IS_ERR(p)) \ | |
7927 | + AuDbg("err %ld\n", PTR_ERR(p)); \ | |
7928 | +} while (0) | |
7929 | + | |
7930 | +/* dirty macros for debug print, use with "%.*s" and caution */ | |
7931 | +#define AuLNPair(qstr) (qstr)->len, (qstr)->name | |
1facf9fc | 7932 | + |
7933 | +/* ---------------------------------------------------------------------- */ | |
7934 | + | |
dece6358 | 7935 | +struct dentry; |
1facf9fc | 7936 | +#ifdef CONFIG_AUFS_DEBUG |
c1595e42 | 7937 | +extern struct mutex au_dbg_mtx; |
1facf9fc | 7938 | +extern char *au_plevel; |
7939 | +struct au_nhash; | |
7940 | +void au_dpri_whlist(struct au_nhash *whlist); | |
7941 | +struct au_vdir; | |
7942 | +void au_dpri_vdir(struct au_vdir *vdir); | |
dece6358 | 7943 | +struct inode; |
1facf9fc | 7944 | +void au_dpri_inode(struct inode *inode); |
2cbb1c4b | 7945 | +void au_dpri_dalias(struct inode *inode); |
1facf9fc | 7946 | +void au_dpri_dentry(struct dentry *dentry); |
dece6358 | 7947 | +struct file; |
1facf9fc | 7948 | +void au_dpri_file(struct file *filp); |
dece6358 | 7949 | +struct super_block; |
1facf9fc | 7950 | +void au_dpri_sb(struct super_block *sb); |
7951 | + | |
027c5e7a AM |
7952 | +#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__) |
7953 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line); | |
1facf9fc | 7954 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen); |
1facf9fc | 7955 | +void au_dbg_verify_kthread(void); |
7956 | + | |
7957 | +int __init au_debug_init(void); | |
7e9cd9fe | 7958 | + |
1facf9fc | 7959 | +#define AuDbgWhlist(w) do { \ |
c1595e42 | 7960 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 7961 | + AuDbg(#w "\n"); \ |
7962 | + au_dpri_whlist(w); \ | |
c1595e42 | 7963 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 7964 | +} while (0) |
7965 | + | |
7966 | +#define AuDbgVdir(v) do { \ | |
c1595e42 | 7967 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 7968 | + AuDbg(#v "\n"); \ |
7969 | + au_dpri_vdir(v); \ | |
c1595e42 | 7970 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 7971 | +} while (0) |
7972 | + | |
7973 | +#define AuDbgInode(i) do { \ | |
c1595e42 | 7974 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 7975 | + AuDbg(#i "\n"); \ |
7976 | + au_dpri_inode(i); \ | |
c1595e42 | 7977 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 7978 | +} while (0) |
7979 | + | |
2cbb1c4b | 7980 | +#define AuDbgDAlias(i) do { \ |
c1595e42 | 7981 | + mutex_lock(&au_dbg_mtx); \ |
2cbb1c4b JR |
7982 | + AuDbg(#i "\n"); \ |
7983 | + au_dpri_dalias(i); \ | |
c1595e42 | 7984 | + mutex_unlock(&au_dbg_mtx); \ |
2cbb1c4b JR |
7985 | +} while (0) |
7986 | + | |
1facf9fc | 7987 | +#define AuDbgDentry(d) do { \ |
c1595e42 | 7988 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 7989 | + AuDbg(#d "\n"); \ |
7990 | + au_dpri_dentry(d); \ | |
c1595e42 | 7991 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 7992 | +} while (0) |
7993 | + | |
7994 | +#define AuDbgFile(f) do { \ | |
c1595e42 | 7995 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 7996 | + AuDbg(#f "\n"); \ |
7997 | + au_dpri_file(f); \ | |
c1595e42 | 7998 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 7999 | +} while (0) |
8000 | + | |
8001 | +#define AuDbgSb(sb) do { \ | |
c1595e42 | 8002 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8003 | + AuDbg(#sb "\n"); \ |
8004 | + au_dpri_sb(sb); \ | |
c1595e42 | 8005 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8006 | +} while (0) |
8007 | + | |
4a4d8108 AM |
8008 | +#define AuDbgSym(addr) do { \ |
8009 | + char sym[KSYM_SYMBOL_LEN]; \ | |
8010 | + sprint_symbol(sym, (unsigned long)addr); \ | |
8011 | + AuDbg("%s\n", sym); \ | |
8012 | +} while (0) | |
1facf9fc | 8013 | +#else |
027c5e7a | 8014 | +AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry) |
4a4d8108 AM |
8015 | +AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen) |
8016 | +AuStubVoid(au_dbg_verify_kthread, void) | |
8017 | +AuStubInt0(__init au_debug_init, void) | |
1facf9fc | 8018 | + |
1facf9fc | 8019 | +#define AuDbgWhlist(w) do {} while (0) |
8020 | +#define AuDbgVdir(v) do {} while (0) | |
8021 | +#define AuDbgInode(i) do {} while (0) | |
2cbb1c4b | 8022 | +#define AuDbgDAlias(i) do {} while (0) |
1facf9fc | 8023 | +#define AuDbgDentry(d) do {} while (0) |
8024 | +#define AuDbgFile(f) do {} while (0) | |
8025 | +#define AuDbgSb(sb) do {} while (0) | |
4a4d8108 | 8026 | +#define AuDbgSym(addr) do {} while (0) |
1facf9fc | 8027 | +#endif /* CONFIG_AUFS_DEBUG */ |
8028 | + | |
8029 | +/* ---------------------------------------------------------------------- */ | |
8030 | + | |
8031 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
8032 | +int __init au_sysrq_init(void); | |
8033 | +void au_sysrq_fin(void); | |
8034 | + | |
8035 | +#ifdef CONFIG_HW_CONSOLE | |
8036 | +#define au_dbg_blocked() do { \ | |
8037 | + WARN_ON(1); \ | |
0c5527e5 | 8038 | + handle_sysrq('w'); \ |
1facf9fc | 8039 | +} while (0) |
8040 | +#else | |
4a4d8108 | 8041 | +AuStubVoid(au_dbg_blocked, void) |
1facf9fc | 8042 | +#endif |
8043 | + | |
8044 | +#else | |
4a4d8108 AM |
8045 | +AuStubInt0(__init au_sysrq_init, void) |
8046 | +AuStubVoid(au_sysrq_fin, void) | |
8047 | +AuStubVoid(au_dbg_blocked, void) | |
1facf9fc | 8048 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ |
8049 | + | |
8050 | +#endif /* __KERNEL__ */ | |
8051 | +#endif /* __AUFS_DEBUG_H__ */ | |
7f207e10 | 8052 | diff -urN /usr/share/empty/fs/aufs/dentry.c linux/fs/aufs/dentry.c |
eca34b5c | 8053 | --- /usr/share/empty/fs/aufs/dentry.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 8054 | +++ linux/fs/aufs/dentry.c 2020-01-27 10:57:18.168871450 +0100 |
eca801bf | 8055 | @@ -0,0 +1,1154 @@ |
cd7a4cd9 | 8056 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 8057 | +/* |
016522bc | 8058 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 8059 | + * |
8060 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8061 | + * it under the terms of the GNU General Public License as published by | |
8062 | + * the Free Software Foundation; either version 2 of the License, or | |
8063 | + * (at your option) any later version. | |
dece6358 AM |
8064 | + * |
8065 | + * This program is distributed in the hope that it will be useful, | |
8066 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8067 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8068 | + * GNU General Public License for more details. | |
8069 | + * | |
8070 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 8071 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 8072 | + */ |
8073 | + | |
8074 | +/* | |
8075 | + * lookup and dentry operations | |
8076 | + */ | |
8077 | + | |
eca801bf | 8078 | +#include <linux/iversion.h> |
dece6358 | 8079 | +#include <linux/namei.h> |
1facf9fc | 8080 | +#include "aufs.h" |
8081 | + | |
1facf9fc | 8082 | +/* |
8083 | + * returns positive/negative dentry, NULL or an error. | |
8084 | + * NULL means whiteout-ed or not-found. | |
8085 | + */ | |
8086 | +static struct dentry* | |
8087 | +au_do_lookup(struct dentry *h_parent, struct dentry *dentry, | |
8b6a4947 | 8088 | + aufs_bindex_t bindex, struct au_do_lookup_args *args) |
1facf9fc | 8089 | +{ |
8090 | + struct dentry *h_dentry; | |
2000de60 | 8091 | + struct inode *h_inode; |
1facf9fc | 8092 | + struct au_branch *br; |
8093 | + int wh_found, opq; | |
8094 | + unsigned char wh_able; | |
8095 | + const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG); | |
076b876e AM |
8096 | + const unsigned char ignore_perm = !!au_ftest_lkup(args->flags, |
8097 | + IGNORE_PERM); | |
1facf9fc | 8098 | + |
1facf9fc | 8099 | + wh_found = 0; |
8100 | + br = au_sbr(dentry->d_sb, bindex); | |
8101 | + wh_able = !!au_br_whable(br->br_perm); | |
8102 | + if (wh_able) | |
8b6a4947 | 8103 | + wh_found = au_wh_test(h_parent, &args->whname, ignore_perm); |
1facf9fc | 8104 | + h_dentry = ERR_PTR(wh_found); |
8105 | + if (!wh_found) | |
8106 | + goto real_lookup; | |
8107 | + if (unlikely(wh_found < 0)) | |
8108 | + goto out; | |
8109 | + | |
8110 | + /* We found a whiteout */ | |
5afbbe0d | 8111 | + /* au_set_dbbot(dentry, bindex); */ |
1facf9fc | 8112 | + au_set_dbwh(dentry, bindex); |
8113 | + if (!allow_neg) | |
8114 | + return NULL; /* success */ | |
8115 | + | |
4f0767ce | 8116 | +real_lookup: |
076b876e | 8117 | + if (!ignore_perm) |
8b6a4947 | 8118 | + h_dentry = vfsub_lkup_one(args->name, h_parent); |
076b876e | 8119 | + else |
8b6a4947 | 8120 | + h_dentry = au_sio_lkup_one(args->name, h_parent); |
2000de60 JR |
8121 | + if (IS_ERR(h_dentry)) { |
8122 | + if (PTR_ERR(h_dentry) == -ENAMETOOLONG | |
8123 | + && !allow_neg) | |
8124 | + h_dentry = NULL; | |
1facf9fc | 8125 | + goto out; |
2000de60 | 8126 | + } |
1facf9fc | 8127 | + |
5527c038 JR |
8128 | + h_inode = d_inode(h_dentry); |
8129 | + if (d_is_negative(h_dentry)) { | |
1facf9fc | 8130 | + if (!allow_neg) |
8131 | + goto out_neg; | |
8132 | + } else if (wh_found | |
8133 | + || (args->type && args->type != (h_inode->i_mode & S_IFMT))) | |
8134 | + goto out_neg; | |
8b6a4947 AM |
8135 | + else if (au_ftest_lkup(args->flags, DIRREN) |
8136 | + /* && h_inode */ | |
8137 | + && !au_dr_lkup_h_ino(args, bindex, h_inode->i_ino)) { | |
8138 | + AuDbg("b%d %pd ignored hi%llu\n", bindex, h_dentry, | |
8139 | + (unsigned long long)h_inode->i_ino); | |
8140 | + goto out_neg; | |
8141 | + } | |
1facf9fc | 8142 | + |
5afbbe0d AM |
8143 | + if (au_dbbot(dentry) <= bindex) |
8144 | + au_set_dbbot(dentry, bindex); | |
8145 | + if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) | |
8146 | + au_set_dbtop(dentry, bindex); | |
1facf9fc | 8147 | + au_set_h_dptr(dentry, bindex, h_dentry); |
8148 | + | |
2000de60 JR |
8149 | + if (!d_is_dir(h_dentry) |
8150 | + || !wh_able | |
5527c038 | 8151 | + || (d_really_is_positive(dentry) && !d_is_dir(dentry))) |
1facf9fc | 8152 | + goto out; /* success */ |
8153 | + | |
be118d29 | 8154 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); |
076b876e | 8155 | + opq = au_diropq_test(h_dentry); |
3c1bdaff | 8156 | + inode_unlock_shared(h_inode); |
1facf9fc | 8157 | + if (opq > 0) |
8158 | + au_set_dbdiropq(dentry, bindex); | |
8159 | + else if (unlikely(opq < 0)) { | |
8160 | + au_set_h_dptr(dentry, bindex, NULL); | |
8161 | + h_dentry = ERR_PTR(opq); | |
8162 | + } | |
8163 | + goto out; | |
8164 | + | |
4f0767ce | 8165 | +out_neg: |
1facf9fc | 8166 | + dput(h_dentry); |
8167 | + h_dentry = NULL; | |
4f0767ce | 8168 | +out: |
1facf9fc | 8169 | + return h_dentry; |
8170 | +} | |
8171 | + | |
dece6358 AM |
8172 | +static int au_test_shwh(struct super_block *sb, const struct qstr *name) |
8173 | +{ | |
8174 | + if (unlikely(!au_opt_test(au_mntflags(sb), SHWH) | |
8175 | + && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))) | |
8176 | + return -EPERM; | |
8177 | + return 0; | |
8178 | +} | |
8179 | + | |
1facf9fc | 8180 | +/* |
8181 | + * returns the number of lower positive dentries, | |
8182 | + * otherwise an error. | |
8183 | + * can be called at unlinking with @type is zero. | |
8184 | + */ | |
5afbbe0d AM |
8185 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, |
8186 | + unsigned int flags) | |
1facf9fc | 8187 | +{ |
8188 | + int npositive, err; | |
8189 | + aufs_bindex_t bindex, btail, bdiropq; | |
8b6a4947 | 8190 | + unsigned char isdir, dirperm1, dirren; |
1facf9fc | 8191 | + struct au_do_lookup_args args = { |
8b6a4947 AM |
8192 | + .flags = flags, |
8193 | + .name = &dentry->d_name | |
1facf9fc | 8194 | + }; |
1facf9fc | 8195 | + struct dentry *parent; |
076b876e | 8196 | + struct super_block *sb; |
1facf9fc | 8197 | + |
076b876e | 8198 | + sb = dentry->d_sb; |
8b6a4947 | 8199 | + err = au_test_shwh(sb, args.name); |
dece6358 | 8200 | + if (unlikely(err)) |
1facf9fc | 8201 | + goto out; |
8202 | + | |
8b6a4947 | 8203 | + err = au_wh_name_alloc(&args.whname, args.name); |
1facf9fc | 8204 | + if (unlikely(err)) |
8205 | + goto out; | |
8206 | + | |
2000de60 | 8207 | + isdir = !!d_is_dir(dentry); |
076b876e | 8208 | + dirperm1 = !!au_opt_test(au_mntflags(sb), DIRPERM1); |
8b6a4947 AM |
8209 | + dirren = !!au_opt_test(au_mntflags(sb), DIRREN); |
8210 | + if (dirren) | |
8211 | + au_fset_lkup(args.flags, DIRREN); | |
1facf9fc | 8212 | + |
8213 | + npositive = 0; | |
4a4d8108 | 8214 | + parent = dget_parent(dentry); |
1facf9fc | 8215 | + btail = au_dbtaildir(parent); |
5afbbe0d | 8216 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 8217 | + struct dentry *h_parent, *h_dentry; |
8218 | + struct inode *h_inode, *h_dir; | |
8b6a4947 | 8219 | + struct au_branch *br; |
1facf9fc | 8220 | + |
8221 | + h_dentry = au_h_dptr(dentry, bindex); | |
8222 | + if (h_dentry) { | |
5527c038 | 8223 | + if (d_is_positive(h_dentry)) |
1facf9fc | 8224 | + npositive++; |
5afbbe0d | 8225 | + break; |
1facf9fc | 8226 | + } |
8227 | + h_parent = au_h_dptr(parent, bindex); | |
2000de60 | 8228 | + if (!h_parent || !d_is_dir(h_parent)) |
1facf9fc | 8229 | + continue; |
8230 | + | |
8b6a4947 AM |
8231 | + if (dirren) { |
8232 | + /* if the inum matches, then use the prepared name */ | |
8233 | + err = au_dr_lkup_name(&args, bindex); | |
8234 | + if (unlikely(err)) | |
8235 | + goto out_parent; | |
8236 | + } | |
8237 | + | |
5527c038 | 8238 | + h_dir = d_inode(h_parent); |
be118d29 | 8239 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
8b6a4947 | 8240 | + h_dentry = au_do_lookup(h_parent, dentry, bindex, &args); |
3c1bdaff | 8241 | + inode_unlock_shared(h_dir); |
1facf9fc | 8242 | + err = PTR_ERR(h_dentry); |
8243 | + if (IS_ERR(h_dentry)) | |
4a4d8108 | 8244 | + goto out_parent; |
2000de60 JR |
8245 | + if (h_dentry) |
8246 | + au_fclr_lkup(args.flags, ALLOW_NEG); | |
076b876e AM |
8247 | + if (dirperm1) |
8248 | + au_fset_lkup(args.flags, IGNORE_PERM); | |
1facf9fc | 8249 | + |
79b8bda9 | 8250 | + if (au_dbwh(dentry) == bindex) |
1facf9fc | 8251 | + break; |
8252 | + if (!h_dentry) | |
8253 | + continue; | |
5527c038 | 8254 | + if (d_is_negative(h_dentry)) |
1facf9fc | 8255 | + continue; |
5527c038 | 8256 | + h_inode = d_inode(h_dentry); |
1facf9fc | 8257 | + npositive++; |
8258 | + if (!args.type) | |
8259 | + args.type = h_inode->i_mode & S_IFMT; | |
8260 | + if (args.type != S_IFDIR) | |
8261 | + break; | |
8262 | + else if (isdir) { | |
8263 | + /* the type of lower may be different */ | |
8264 | + bdiropq = au_dbdiropq(dentry); | |
8265 | + if (bdiropq >= 0 && bdiropq <= bindex) | |
8266 | + break; | |
8267 | + } | |
8b6a4947 AM |
8268 | + br = au_sbr(sb, bindex); |
8269 | + if (dirren | |
8270 | + && au_dr_hino_test_add(&br->br_dirren, h_inode->i_ino, | |
8271 | + /*add_ent*/NULL)) { | |
8272 | + /* prepare next name to lookup */ | |
8273 | + err = au_dr_lkup(&args, dentry, bindex); | |
8274 | + if (unlikely(err)) | |
8275 | + goto out_parent; | |
8276 | + } | |
1facf9fc | 8277 | + } |
8278 | + | |
8279 | + if (npositive) { | |
8280 | + AuLabel(positive); | |
5afbbe0d | 8281 | + au_update_dbtop(dentry); |
1facf9fc | 8282 | + } |
8283 | + err = npositive; | |
076b876e | 8284 | + if (unlikely(!au_opt_test(au_mntflags(sb), UDBA_NONE) |
5afbbe0d | 8285 | + && au_dbtop(dentry) < 0)) { |
1facf9fc | 8286 | + err = -EIO; |
523b37e3 AM |
8287 | + AuIOErr("both of real entry and whiteout found, %pd, err %d\n", |
8288 | + dentry, err); | |
027c5e7a | 8289 | + } |
1facf9fc | 8290 | + |
4f0767ce | 8291 | +out_parent: |
4a4d8108 | 8292 | + dput(parent); |
9f237c51 | 8293 | + au_kfree_try_rcu(args.whname.name); |
8b6a4947 AM |
8294 | + if (dirren) |
8295 | + au_dr_lkup_fin(&args); | |
4f0767ce | 8296 | +out: |
1facf9fc | 8297 | + return err; |
8298 | +} | |
8299 | + | |
076b876e | 8300 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent) |
1facf9fc | 8301 | +{ |
8302 | + struct dentry *dentry; | |
8303 | + int wkq_err; | |
8304 | + | |
5527c038 | 8305 | + if (!au_test_h_perm_sio(d_inode(parent), MAY_EXEC)) |
b4510431 | 8306 | + dentry = vfsub_lkup_one(name, parent); |
1facf9fc | 8307 | + else { |
b4510431 AM |
8308 | + struct vfsub_lkup_one_args args = { |
8309 | + .errp = &dentry, | |
8310 | + .name = name, | |
8311 | + .parent = parent | |
1facf9fc | 8312 | + }; |
8313 | + | |
b4510431 | 8314 | + wkq_err = au_wkq_wait(vfsub_call_lkup_one, &args); |
1facf9fc | 8315 | + if (unlikely(wkq_err)) |
8316 | + dentry = ERR_PTR(wkq_err); | |
8317 | + } | |
8318 | + | |
8319 | + return dentry; | |
8320 | +} | |
8321 | + | |
8322 | +/* | |
8323 | + * lookup @dentry on @bindex which should be negative. | |
8324 | + */ | |
86dc4139 | 8325 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh) |
1facf9fc | 8326 | +{ |
8327 | + int err; | |
8328 | + struct dentry *parent, *h_parent, *h_dentry; | |
86dc4139 | 8329 | + struct au_branch *br; |
1facf9fc | 8330 | + |
1facf9fc | 8331 | + parent = dget_parent(dentry); |
8332 | + h_parent = au_h_dptr(parent, bindex); | |
86dc4139 AM |
8333 | + br = au_sbr(dentry->d_sb, bindex); |
8334 | + if (wh) | |
8335 | + h_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
8336 | + else | |
076b876e | 8337 | + h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent); |
1facf9fc | 8338 | + err = PTR_ERR(h_dentry); |
8339 | + if (IS_ERR(h_dentry)) | |
8340 | + goto out; | |
5527c038 | 8341 | + if (unlikely(d_is_positive(h_dentry))) { |
1facf9fc | 8342 | + err = -EIO; |
523b37e3 | 8343 | + AuIOErr("%pd should be negative on b%d.\n", h_dentry, bindex); |
1facf9fc | 8344 | + dput(h_dentry); |
8345 | + goto out; | |
8346 | + } | |
8347 | + | |
4a4d8108 | 8348 | + err = 0; |
5afbbe0d AM |
8349 | + if (bindex < au_dbtop(dentry)) |
8350 | + au_set_dbtop(dentry, bindex); | |
8351 | + if (au_dbbot(dentry) < bindex) | |
8352 | + au_set_dbbot(dentry, bindex); | |
1facf9fc | 8353 | + au_set_h_dptr(dentry, bindex, h_dentry); |
1facf9fc | 8354 | + |
4f0767ce | 8355 | +out: |
1facf9fc | 8356 | + dput(parent); |
8357 | + return err; | |
8358 | +} | |
8359 | + | |
8360 | +/* ---------------------------------------------------------------------- */ | |
8361 | + | |
8362 | +/* subset of struct inode */ | |
8363 | +struct au_iattr { | |
8364 | + unsigned long i_ino; | |
8365 | + /* unsigned int i_nlink; */ | |
0c3ec466 AM |
8366 | + kuid_t i_uid; |
8367 | + kgid_t i_gid; | |
1facf9fc | 8368 | + u64 i_version; |
8369 | +/* | |
8370 | + loff_t i_size; | |
8371 | + blkcnt_t i_blocks; | |
8372 | +*/ | |
8373 | + umode_t i_mode; | |
8374 | +}; | |
8375 | + | |
8376 | +static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode) | |
8377 | +{ | |
8378 | + ia->i_ino = h_inode->i_ino; | |
8379 | + /* ia->i_nlink = h_inode->i_nlink; */ | |
8380 | + ia->i_uid = h_inode->i_uid; | |
8381 | + ia->i_gid = h_inode->i_gid; | |
be118d29 | 8382 | + ia->i_version = inode_query_iversion(h_inode); |
1facf9fc | 8383 | +/* |
8384 | + ia->i_size = h_inode->i_size; | |
8385 | + ia->i_blocks = h_inode->i_blocks; | |
8386 | +*/ | |
8387 | + ia->i_mode = (h_inode->i_mode & S_IFMT); | |
8388 | +} | |
8389 | + | |
8390 | +static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode) | |
8391 | +{ | |
8392 | + return ia->i_ino != h_inode->i_ino | |
8393 | + /* || ia->i_nlink != h_inode->i_nlink */ | |
0c3ec466 | 8394 | + || !uid_eq(ia->i_uid, h_inode->i_uid) |
2dfbb274 | 8395 | + || !gid_eq(ia->i_gid, h_inode->i_gid) |
be118d29 | 8396 | + || !inode_eq_iversion(h_inode, ia->i_version) |
1facf9fc | 8397 | +/* |
8398 | + || ia->i_size != h_inode->i_size | |
8399 | + || ia->i_blocks != h_inode->i_blocks | |
8400 | +*/ | |
8401 | + || ia->i_mode != (h_inode->i_mode & S_IFMT); | |
8402 | +} | |
8403 | + | |
8404 | +static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent, | |
8405 | + struct au_branch *br) | |
8406 | +{ | |
8407 | + int err; | |
8408 | + struct au_iattr ia; | |
8409 | + struct inode *h_inode; | |
8410 | + struct dentry *h_d; | |
8411 | + struct super_block *h_sb; | |
8412 | + | |
8413 | + err = 0; | |
8414 | + memset(&ia, -1, sizeof(ia)); | |
8415 | + h_sb = h_dentry->d_sb; | |
5527c038 JR |
8416 | + h_inode = NULL; |
8417 | + if (d_is_positive(h_dentry)) { | |
8418 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 8419 | + au_iattr_save(&ia, h_inode); |
5527c038 | 8420 | + } else if (au_test_nfs(h_sb) || au_test_fuse(h_sb)) |
1facf9fc | 8421 | + /* nfs d_revalidate may return 0 for negative dentry */ |
8422 | + /* fuse d_revalidate always return 0 for negative dentry */ | |
8423 | + goto out; | |
8424 | + | |
8425 | + /* main purpose is namei.c:cached_lookup() and d_revalidate */ | |
b4510431 | 8426 | + h_d = vfsub_lkup_one(&h_dentry->d_name, h_parent); |
1facf9fc | 8427 | + err = PTR_ERR(h_d); |
8428 | + if (IS_ERR(h_d)) | |
8429 | + goto out; | |
8430 | + | |
8431 | + err = 0; | |
8432 | + if (unlikely(h_d != h_dentry | |
5527c038 | 8433 | + || d_inode(h_d) != h_inode |
1facf9fc | 8434 | + || (h_inode && au_iattr_test(&ia, h_inode)))) |
8435 | + err = au_busy_or_stale(); | |
8436 | + dput(h_d); | |
8437 | + | |
4f0767ce | 8438 | +out: |
1facf9fc | 8439 | + AuTraceErr(err); |
8440 | + return err; | |
8441 | +} | |
8442 | + | |
8443 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
8444 | + struct dentry *h_parent, struct au_branch *br) | |
8445 | +{ | |
8446 | + int err; | |
8447 | + | |
8448 | + err = 0; | |
027c5e7a AM |
8449 | + if (udba == AuOpt_UDBA_REVAL |
8450 | + && !au_test_fs_remote(h_dentry->d_sb)) { | |
1facf9fc | 8451 | + IMustLock(h_dir); |
5527c038 | 8452 | + err = (d_inode(h_dentry->d_parent) != h_dir); |
027c5e7a | 8453 | + } else if (udba != AuOpt_UDBA_NONE) |
1facf9fc | 8454 | + err = au_h_verify_dentry(h_dentry, h_parent, br); |
8455 | + | |
8456 | + return err; | |
8457 | +} | |
8458 | + | |
8459 | +/* ---------------------------------------------------------------------- */ | |
8460 | + | |
027c5e7a | 8461 | +static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent) |
1facf9fc | 8462 | +{ |
027c5e7a | 8463 | + int err; |
5afbbe0d | 8464 | + aufs_bindex_t new_bindex, bindex, bbot, bwh, bdiropq; |
027c5e7a AM |
8465 | + struct au_hdentry tmp, *p, *q; |
8466 | + struct au_dinfo *dinfo; | |
8467 | + struct super_block *sb; | |
1facf9fc | 8468 | + |
027c5e7a | 8469 | + DiMustWriteLock(dentry); |
1308ab2a | 8470 | + |
027c5e7a AM |
8471 | + sb = dentry->d_sb; |
8472 | + dinfo = au_di(dentry); | |
5afbbe0d | 8473 | + bbot = dinfo->di_bbot; |
1facf9fc | 8474 | + bwh = dinfo->di_bwh; |
8475 | + bdiropq = dinfo->di_bdiropq; | |
5afbbe0d AM |
8476 | + bindex = dinfo->di_btop; |
8477 | + p = au_hdentry(dinfo, bindex); | |
8478 | + for (; bindex <= bbot; bindex++, p++) { | |
027c5e7a | 8479 | + if (!p->hd_dentry) |
1facf9fc | 8480 | + continue; |
8481 | + | |
027c5e7a AM |
8482 | + new_bindex = au_br_index(sb, p->hd_id); |
8483 | + if (new_bindex == bindex) | |
1facf9fc | 8484 | + continue; |
1facf9fc | 8485 | + |
1facf9fc | 8486 | + if (dinfo->di_bwh == bindex) |
8487 | + bwh = new_bindex; | |
8488 | + if (dinfo->di_bdiropq == bindex) | |
8489 | + bdiropq = new_bindex; | |
8490 | + if (new_bindex < 0) { | |
8491 | + au_hdput(p); | |
8492 | + p->hd_dentry = NULL; | |
8493 | + continue; | |
8494 | + } | |
8495 | + | |
8496 | + /* swap two lower dentries, and loop again */ | |
5afbbe0d | 8497 | + q = au_hdentry(dinfo, new_bindex); |
1facf9fc | 8498 | + tmp = *q; |
8499 | + *q = *p; | |
8500 | + *p = tmp; | |
8501 | + if (tmp.hd_dentry) { | |
8502 | + bindex--; | |
8503 | + p--; | |
8504 | + } | |
8505 | + } | |
8506 | + | |
1facf9fc | 8507 | + dinfo->di_bwh = -1; |
5afbbe0d | 8508 | + if (bwh >= 0 && bwh <= au_sbbot(sb) && au_sbr_whable(sb, bwh)) |
1facf9fc | 8509 | + dinfo->di_bwh = bwh; |
8510 | + | |
8511 | + dinfo->di_bdiropq = -1; | |
8512 | + if (bdiropq >= 0 | |
5afbbe0d | 8513 | + && bdiropq <= au_sbbot(sb) |
1facf9fc | 8514 | + && au_sbr_whable(sb, bdiropq)) |
8515 | + dinfo->di_bdiropq = bdiropq; | |
8516 | + | |
027c5e7a | 8517 | + err = -EIO; |
5afbbe0d AM |
8518 | + dinfo->di_btop = -1; |
8519 | + dinfo->di_bbot = -1; | |
8520 | + bbot = au_dbbot(parent); | |
8521 | + bindex = 0; | |
8522 | + p = au_hdentry(dinfo, bindex); | |
8523 | + for (; bindex <= bbot; bindex++, p++) | |
1facf9fc | 8524 | + if (p->hd_dentry) { |
5afbbe0d | 8525 | + dinfo->di_btop = bindex; |
1facf9fc | 8526 | + break; |
8527 | + } | |
8528 | + | |
5afbbe0d AM |
8529 | + if (dinfo->di_btop >= 0) { |
8530 | + bindex = bbot; | |
8531 | + p = au_hdentry(dinfo, bindex); | |
8532 | + for (; bindex >= 0; bindex--, p--) | |
027c5e7a | 8533 | + if (p->hd_dentry) { |
5afbbe0d | 8534 | + dinfo->di_bbot = bindex; |
027c5e7a AM |
8535 | + err = 0; |
8536 | + break; | |
8537 | + } | |
8538 | + } | |
8539 | + | |
8540 | + return err; | |
1facf9fc | 8541 | +} |
8542 | + | |
027c5e7a | 8543 | +static void au_do_hide(struct dentry *dentry) |
1facf9fc | 8544 | +{ |
027c5e7a | 8545 | + struct inode *inode; |
1facf9fc | 8546 | + |
5527c038 JR |
8547 | + if (d_really_is_positive(dentry)) { |
8548 | + inode = d_inode(dentry); | |
8549 | + if (!d_is_dir(dentry)) { | |
027c5e7a AM |
8550 | + if (inode->i_nlink && !d_unhashed(dentry)) |
8551 | + drop_nlink(inode); | |
8552 | + } else { | |
8553 | + clear_nlink(inode); | |
8554 | + /* stop next lookup */ | |
8555 | + inode->i_flags |= S_DEAD; | |
8556 | + } | |
8557 | + smp_mb(); /* necessary? */ | |
8558 | + } | |
8559 | + d_drop(dentry); | |
8560 | +} | |
1308ab2a | 8561 | + |
027c5e7a AM |
8562 | +static int au_hide_children(struct dentry *parent) |
8563 | +{ | |
8564 | + int err, i, j, ndentry; | |
8565 | + struct au_dcsub_pages dpages; | |
8566 | + struct au_dpage *dpage; | |
8567 | + struct dentry *dentry; | |
1facf9fc | 8568 | + |
027c5e7a | 8569 | + err = au_dpages_init(&dpages, GFP_NOFS); |
1facf9fc | 8570 | + if (unlikely(err)) |
8571 | + goto out; | |
027c5e7a AM |
8572 | + err = au_dcsub_pages(&dpages, parent, NULL, NULL); |
8573 | + if (unlikely(err)) | |
8574 | + goto out_dpages; | |
1facf9fc | 8575 | + |
027c5e7a AM |
8576 | + /* in reverse order */ |
8577 | + for (i = dpages.ndpage - 1; i >= 0; i--) { | |
8578 | + dpage = dpages.dpages + i; | |
8579 | + ndentry = dpage->ndentry; | |
8580 | + for (j = ndentry - 1; j >= 0; j--) { | |
8581 | + dentry = dpage->dentries[j]; | |
8582 | + if (dentry != parent) | |
8583 | + au_do_hide(dentry); | |
8584 | + } | |
8585 | + } | |
1facf9fc | 8586 | + |
027c5e7a AM |
8587 | +out_dpages: |
8588 | + au_dpages_free(&dpages); | |
4f0767ce | 8589 | +out: |
027c5e7a | 8590 | + return err; |
1facf9fc | 8591 | +} |
8592 | + | |
027c5e7a | 8593 | +static void au_hide(struct dentry *dentry) |
1facf9fc | 8594 | +{ |
027c5e7a | 8595 | + int err; |
1facf9fc | 8596 | + |
027c5e7a | 8597 | + AuDbgDentry(dentry); |
2000de60 | 8598 | + if (d_is_dir(dentry)) { |
027c5e7a AM |
8599 | + /* shrink_dcache_parent(dentry); */ |
8600 | + err = au_hide_children(dentry); | |
8601 | + if (unlikely(err)) | |
523b37e3 AM |
8602 | + AuIOErr("%pd, failed hiding children, ignored %d\n", |
8603 | + dentry, err); | |
027c5e7a AM |
8604 | + } |
8605 | + au_do_hide(dentry); | |
8606 | +} | |
1facf9fc | 8607 | + |
027c5e7a AM |
8608 | +/* |
8609 | + * By adding a dirty branch, a cached dentry may be affected in various ways. | |
8610 | + * | |
8611 | + * a dirty branch is added | |
8612 | + * - on the top of layers | |
8613 | + * - in the middle of layers | |
8614 | + * - to the bottom of layers | |
8615 | + * | |
8616 | + * on the added branch there exists | |
8617 | + * - a whiteout | |
8618 | + * - a diropq | |
8619 | + * - a same named entry | |
8620 | + * + exist | |
8621 | + * * negative --> positive | |
8622 | + * * positive --> positive | |
8623 | + * - type is unchanged | |
8624 | + * - type is changed | |
8625 | + * + doesn't exist | |
8626 | + * * negative --> negative | |
8627 | + * * positive --> negative (rejected by au_br_del() for non-dir case) | |
8628 | + * - none | |
8629 | + */ | |
8630 | +static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo, | |
8631 | + struct au_dinfo *tmp) | |
8632 | +{ | |
8633 | + int err; | |
5afbbe0d | 8634 | + aufs_bindex_t bindex, bbot; |
027c5e7a AM |
8635 | + struct { |
8636 | + struct dentry *dentry; | |
8637 | + struct inode *inode; | |
8638 | + mode_t mode; | |
be52b249 AM |
8639 | + } orig_h, tmp_h = { |
8640 | + .dentry = NULL | |
8641 | + }; | |
027c5e7a AM |
8642 | + struct au_hdentry *hd; |
8643 | + struct inode *inode, *h_inode; | |
8644 | + struct dentry *h_dentry; | |
8645 | + | |
8646 | + err = 0; | |
5afbbe0d | 8647 | + AuDebugOn(dinfo->di_btop < 0); |
027c5e7a | 8648 | + orig_h.mode = 0; |
5afbbe0d | 8649 | + orig_h.dentry = au_hdentry(dinfo, dinfo->di_btop)->hd_dentry; |
5527c038 JR |
8650 | + orig_h.inode = NULL; |
8651 | + if (d_is_positive(orig_h.dentry)) { | |
8652 | + orig_h.inode = d_inode(orig_h.dentry); | |
027c5e7a | 8653 | + orig_h.mode = orig_h.inode->i_mode & S_IFMT; |
5527c038 | 8654 | + } |
5afbbe0d AM |
8655 | + if (tmp->di_btop >= 0) { |
8656 | + tmp_h.dentry = au_hdentry(tmp, tmp->di_btop)->hd_dentry; | |
5527c038 JR |
8657 | + if (d_is_positive(tmp_h.dentry)) { |
8658 | + tmp_h.inode = d_inode(tmp_h.dentry); | |
027c5e7a | 8659 | + tmp_h.mode = tmp_h.inode->i_mode & S_IFMT; |
5527c038 | 8660 | + } |
027c5e7a AM |
8661 | + } |
8662 | + | |
5527c038 JR |
8663 | + inode = NULL; |
8664 | + if (d_really_is_positive(dentry)) | |
8665 | + inode = d_inode(dentry); | |
027c5e7a | 8666 | + if (!orig_h.inode) { |
acd2b654 | 8667 | + AuDbg("negative originally\n"); |
027c5e7a AM |
8668 | + if (inode) { |
8669 | + au_hide(dentry); | |
8670 | + goto out; | |
8671 | + } | |
8672 | + AuDebugOn(inode); | |
5afbbe0d | 8673 | + AuDebugOn(dinfo->di_btop != dinfo->di_bbot); |
027c5e7a AM |
8674 | + AuDebugOn(dinfo->di_bdiropq != -1); |
8675 | + | |
8676 | + if (!tmp_h.inode) { | |
8677 | + AuDbg("negative --> negative\n"); | |
8678 | + /* should have only one negative lower */ | |
5afbbe0d AM |
8679 | + if (tmp->di_btop >= 0 |
8680 | + && tmp->di_btop < dinfo->di_btop) { | |
8681 | + AuDebugOn(tmp->di_btop != tmp->di_bbot); | |
8682 | + AuDebugOn(dinfo->di_btop != dinfo->di_bbot); | |
8683 | + au_set_h_dptr(dentry, dinfo->di_btop, NULL); | |
027c5e7a | 8684 | + au_di_cp(dinfo, tmp); |
5afbbe0d AM |
8685 | + hd = au_hdentry(tmp, tmp->di_btop); |
8686 | + au_set_h_dptr(dentry, tmp->di_btop, | |
027c5e7a AM |
8687 | + dget(hd->hd_dentry)); |
8688 | + } | |
8689 | + au_dbg_verify_dinode(dentry); | |
8690 | + } else { | |
8691 | + AuDbg("negative --> positive\n"); | |
8692 | + /* | |
8693 | + * similar to the behaviour of creating with bypassing | |
8694 | + * aufs. | |
8695 | + * unhash it in order to force an error in the | |
8696 | + * succeeding create operation. | |
8697 | + * we should not set S_DEAD here. | |
8698 | + */ | |
8699 | + d_drop(dentry); | |
8700 | + /* au_di_swap(tmp, dinfo); */ | |
8701 | + au_dbg_verify_dinode(dentry); | |
8702 | + } | |
8703 | + } else { | |
8704 | + AuDbg("positive originally\n"); | |
8705 | + /* inode may be NULL */ | |
8706 | + AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode); | |
8707 | + if (!tmp_h.inode) { | |
8708 | + AuDbg("positive --> negative\n"); | |
8709 | + /* or bypassing aufs */ | |
8710 | + au_hide(dentry); | |
5afbbe0d | 8711 | + if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_btop) |
027c5e7a AM |
8712 | + dinfo->di_bwh = tmp->di_bwh; |
8713 | + if (inode) | |
8714 | + err = au_refresh_hinode_self(inode); | |
8715 | + au_dbg_verify_dinode(dentry); | |
8716 | + } else if (orig_h.mode == tmp_h.mode) { | |
8717 | + AuDbg("positive --> positive, same type\n"); | |
8718 | + if (!S_ISDIR(orig_h.mode) | |
5afbbe0d | 8719 | + && dinfo->di_btop > tmp->di_btop) { |
027c5e7a AM |
8720 | + /* |
8721 | + * similar to the behaviour of removing and | |
8722 | + * creating. | |
8723 | + */ | |
8724 | + au_hide(dentry); | |
8725 | + if (inode) | |
8726 | + err = au_refresh_hinode_self(inode); | |
8727 | + au_dbg_verify_dinode(dentry); | |
8728 | + } else { | |
8729 | + /* fill empty slots */ | |
5afbbe0d AM |
8730 | + if (dinfo->di_btop > tmp->di_btop) |
8731 | + dinfo->di_btop = tmp->di_btop; | |
8732 | + if (dinfo->di_bbot < tmp->di_bbot) | |
8733 | + dinfo->di_bbot = tmp->di_bbot; | |
027c5e7a AM |
8734 | + dinfo->di_bwh = tmp->di_bwh; |
8735 | + dinfo->di_bdiropq = tmp->di_bdiropq; | |
5afbbe0d AM |
8736 | + bbot = dinfo->di_bbot; |
8737 | + bindex = tmp->di_btop; | |
8738 | + hd = au_hdentry(tmp, bindex); | |
8739 | + for (; bindex <= bbot; bindex++, hd++) { | |
027c5e7a AM |
8740 | + if (au_h_dptr(dentry, bindex)) |
8741 | + continue; | |
5afbbe0d | 8742 | + h_dentry = hd->hd_dentry; |
027c5e7a AM |
8743 | + if (!h_dentry) |
8744 | + continue; | |
5527c038 JR |
8745 | + AuDebugOn(d_is_negative(h_dentry)); |
8746 | + h_inode = d_inode(h_dentry); | |
027c5e7a AM |
8747 | + AuDebugOn(orig_h.mode |
8748 | + != (h_inode->i_mode | |
8749 | + & S_IFMT)); | |
8750 | + au_set_h_dptr(dentry, bindex, | |
8751 | + dget(h_dentry)); | |
8752 | + } | |
5afbbe0d AM |
8753 | + if (inode) |
8754 | + err = au_refresh_hinode(inode, dentry); | |
027c5e7a AM |
8755 | + au_dbg_verify_dinode(dentry); |
8756 | + } | |
8757 | + } else { | |
8758 | + AuDbg("positive --> positive, different type\n"); | |
8759 | + /* similar to the behaviour of removing and creating */ | |
8760 | + au_hide(dentry); | |
8761 | + if (inode) | |
8762 | + err = au_refresh_hinode_self(inode); | |
8763 | + au_dbg_verify_dinode(dentry); | |
8764 | + } | |
8765 | + } | |
8766 | + | |
8767 | +out: | |
8768 | + return err; | |
8769 | +} | |
8770 | + | |
79b8bda9 AM |
8771 | +void au_refresh_dop(struct dentry *dentry, int force_reval) |
8772 | +{ | |
8773 | + const struct dentry_operations *dop | |
8774 | + = force_reval ? &aufs_dop : dentry->d_sb->s_d_op; | |
8775 | + static const unsigned int mask | |
8776 | + = DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE; | |
8777 | + | |
8778 | + BUILD_BUG_ON(sizeof(mask) != sizeof(dentry->d_flags)); | |
8779 | + | |
8780 | + if (dentry->d_op == dop) | |
8781 | + return; | |
8782 | + | |
8783 | + AuDbg("%pd\n", dentry); | |
8784 | + spin_lock(&dentry->d_lock); | |
8785 | + if (dop == &aufs_dop) | |
8786 | + dentry->d_flags |= mask; | |
8787 | + else | |
8788 | + dentry->d_flags &= ~mask; | |
8789 | + dentry->d_op = dop; | |
8790 | + spin_unlock(&dentry->d_lock); | |
8791 | +} | |
8792 | + | |
027c5e7a AM |
8793 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent) |
8794 | +{ | |
e2f27e51 | 8795 | + int err, ebrange, nbr; |
027c5e7a AM |
8796 | + unsigned int sigen; |
8797 | + struct au_dinfo *dinfo, *tmp; | |
8798 | + struct super_block *sb; | |
8799 | + struct inode *inode; | |
8800 | + | |
8801 | + DiMustWriteLock(dentry); | |
8802 | + AuDebugOn(IS_ROOT(dentry)); | |
5527c038 | 8803 | + AuDebugOn(d_really_is_negative(parent)); |
027c5e7a AM |
8804 | + |
8805 | + sb = dentry->d_sb; | |
027c5e7a AM |
8806 | + sigen = au_sigen(sb); |
8807 | + err = au_digen_test(parent, sigen); | |
8808 | + if (unlikely(err)) | |
8809 | + goto out; | |
8810 | + | |
e2f27e51 | 8811 | + nbr = au_sbbot(sb) + 1; |
027c5e7a | 8812 | + dinfo = au_di(dentry); |
e2f27e51 | 8813 | + err = au_di_realloc(dinfo, nbr, /*may_shrink*/0); |
027c5e7a AM |
8814 | + if (unlikely(err)) |
8815 | + goto out; | |
8816 | + ebrange = au_dbrange_test(dentry); | |
8817 | + if (!ebrange) | |
8818 | + ebrange = au_do_refresh_hdentry(dentry, parent); | |
8819 | + | |
38d290e6 | 8820 | + if (d_unhashed(dentry) || ebrange /* || dinfo->di_tmpfile */) { |
5afbbe0d | 8821 | + AuDebugOn(au_dbtop(dentry) < 0 && au_dbbot(dentry) >= 0); |
5527c038 JR |
8822 | + if (d_really_is_positive(dentry)) { |
8823 | + inode = d_inode(dentry); | |
027c5e7a | 8824 | + err = au_refresh_hinode_self(inode); |
5527c038 | 8825 | + } |
027c5e7a AM |
8826 | + au_dbg_verify_dinode(dentry); |
8827 | + if (!err) | |
8828 | + goto out_dgen; /* success */ | |
8829 | + goto out; | |
8830 | + } | |
8831 | + | |
8832 | + /* temporary dinfo */ | |
8833 | + AuDbgDentry(dentry); | |
8834 | + err = -ENOMEM; | |
8835 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
8836 | + if (unlikely(!tmp)) | |
8837 | + goto out; | |
8838 | + au_di_swap(tmp, dinfo); | |
8839 | + /* returns the number of positive dentries */ | |
8840 | + /* | |
8841 | + * if current working dir is removed, it returns an error. | |
8842 | + * but the dentry is legal. | |
8843 | + */ | |
5afbbe0d | 8844 | + err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); |
027c5e7a AM |
8845 | + AuDbgDentry(dentry); |
8846 | + au_di_swap(tmp, dinfo); | |
8847 | + if (err == -ENOENT) | |
8848 | + err = 0; | |
8849 | + if (err >= 0) { | |
8850 | + /* compare/refresh by dinfo */ | |
8851 | + AuDbgDentry(dentry); | |
8852 | + err = au_refresh_by_dinfo(dentry, dinfo, tmp); | |
8853 | + au_dbg_verify_dinode(dentry); | |
8854 | + AuTraceErr(err); | |
8855 | + } | |
e2f27e51 | 8856 | + au_di_realloc(dinfo, nbr, /*may_shrink*/1); /* harmless if err */ |
027c5e7a AM |
8857 | + au_rw_write_unlock(&tmp->di_rwsem); |
8858 | + au_di_free(tmp); | |
8859 | + if (unlikely(err)) | |
8860 | + goto out; | |
8861 | + | |
8862 | +out_dgen: | |
8863 | + au_update_digen(dentry); | |
8864 | +out: | |
8865 | + if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) { | |
523b37e3 | 8866 | + AuIOErr("failed refreshing %pd, %d\n", dentry, err); |
027c5e7a AM |
8867 | + AuDbgDentry(dentry); |
8868 | + } | |
8869 | + AuTraceErr(err); | |
8870 | + return err; | |
8871 | +} | |
8872 | + | |
b4510431 AM |
8873 | +static int au_do_h_d_reval(struct dentry *h_dentry, unsigned int flags, |
8874 | + struct dentry *dentry, aufs_bindex_t bindex) | |
027c5e7a AM |
8875 | +{ |
8876 | + int err, valid; | |
027c5e7a AM |
8877 | + |
8878 | + err = 0; | |
8879 | + if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE)) | |
8880 | + goto out; | |
027c5e7a AM |
8881 | + |
8882 | + AuDbg("b%d\n", bindex); | |
b4510431 AM |
8883 | + /* |
8884 | + * gave up supporting LOOKUP_CREATE/OPEN for lower fs, | |
8885 | + * due to whiteout and branch permission. | |
8886 | + */ | |
8887 | + flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE | |
8888 | + | LOOKUP_FOLLOW | LOOKUP_EXCL); | |
8889 | + /* it may return tri-state */ | |
8890 | + valid = h_dentry->d_op->d_revalidate(h_dentry, flags); | |
1facf9fc | 8891 | + |
8892 | + if (unlikely(valid < 0)) | |
8893 | + err = valid; | |
8894 | + else if (!valid) | |
8895 | + err = -EINVAL; | |
8896 | + | |
4f0767ce | 8897 | +out: |
1facf9fc | 8898 | + AuTraceErr(err); |
8899 | + return err; | |
8900 | +} | |
8901 | + | |
8902 | +/* todo: remove this */ | |
8903 | +static int h_d_revalidate(struct dentry *dentry, struct inode *inode, | |
8b6a4947 | 8904 | + unsigned int flags, int do_udba, int dirren) |
1facf9fc | 8905 | +{ |
8906 | + int err; | |
8907 | + umode_t mode, h_mode; | |
5afbbe0d | 8908 | + aufs_bindex_t bindex, btail, btop, ibs, ibe; |
38d290e6 | 8909 | + unsigned char plus, unhashed, is_root, h_plus, h_nfs, tmpfile; |
4a4d8108 | 8910 | + struct inode *h_inode, *h_cached_inode; |
1facf9fc | 8911 | + struct dentry *h_dentry; |
8912 | + struct qstr *name, *h_name; | |
8913 | + | |
8914 | + err = 0; | |
8915 | + plus = 0; | |
8916 | + mode = 0; | |
1facf9fc | 8917 | + ibs = -1; |
8918 | + ibe = -1; | |
8919 | + unhashed = !!d_unhashed(dentry); | |
8920 | + is_root = !!IS_ROOT(dentry); | |
8921 | + name = &dentry->d_name; | |
38d290e6 | 8922 | + tmpfile = au_di(dentry)->di_tmpfile; |
1facf9fc | 8923 | + |
8924 | + /* | |
7f207e10 AM |
8925 | + * Theoretically, REVAL test should be unnecessary in case of |
8926 | + * {FS,I}NOTIFY. | |
8927 | + * But {fs,i}notify doesn't fire some necessary events, | |
1facf9fc | 8928 | + * IN_ATTRIB for atime/nlink/pageio |
1facf9fc | 8929 | + * Let's do REVAL test too. |
8930 | + */ | |
8931 | + if (do_udba && inode) { | |
8932 | + mode = (inode->i_mode & S_IFMT); | |
8933 | + plus = (inode->i_nlink > 0); | |
5afbbe0d AM |
8934 | + ibs = au_ibtop(inode); |
8935 | + ibe = au_ibbot(inode); | |
1facf9fc | 8936 | + } |
8937 | + | |
5afbbe0d AM |
8938 | + btop = au_dbtop(dentry); |
8939 | + btail = btop; | |
1facf9fc | 8940 | + if (inode && S_ISDIR(inode->i_mode)) |
8941 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 8942 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 8943 | + h_dentry = au_h_dptr(dentry, bindex); |
8944 | + if (!h_dentry) | |
8945 | + continue; | |
8946 | + | |
523b37e3 AM |
8947 | + AuDbg("b%d, %pd\n", bindex, h_dentry); |
8948 | + h_nfs = !!au_test_nfs(h_dentry->d_sb); | |
027c5e7a | 8949 | + spin_lock(&h_dentry->d_lock); |
1facf9fc | 8950 | + h_name = &h_dentry->d_name; |
8951 | + if (unlikely(do_udba | |
8952 | + && !is_root | |
523b37e3 AM |
8953 | + && ((!h_nfs |
8954 | + && (unhashed != !!d_unhashed(h_dentry) | |
8b6a4947 | 8955 | + || (!tmpfile && !dirren |
38d290e6 JR |
8956 | + && !au_qstreq(name, h_name)) |
8957 | + )) | |
523b37e3 AM |
8958 | + || (h_nfs |
8959 | + && !(flags & LOOKUP_OPEN) | |
8960 | + && (h_dentry->d_flags | |
8961 | + & DCACHE_NFSFS_RENAMED))) | |
1facf9fc | 8962 | + )) { |
38d290e6 JR |
8963 | + int h_unhashed; |
8964 | + | |
8965 | + h_unhashed = d_unhashed(h_dentry); | |
027c5e7a | 8966 | + spin_unlock(&h_dentry->d_lock); |
38d290e6 JR |
8967 | + AuDbg("unhash 0x%x 0x%x, %pd %pd\n", |
8968 | + unhashed, h_unhashed, dentry, h_dentry); | |
1facf9fc | 8969 | + goto err; |
8970 | + } | |
027c5e7a | 8971 | + spin_unlock(&h_dentry->d_lock); |
1facf9fc | 8972 | + |
b4510431 | 8973 | + err = au_do_h_d_reval(h_dentry, flags, dentry, bindex); |
1facf9fc | 8974 | + if (unlikely(err)) |
8975 | + /* do not goto err, to keep the errno */ | |
8976 | + break; | |
8977 | + | |
8978 | + /* todo: plink too? */ | |
8979 | + if (!do_udba) | |
8980 | + continue; | |
8981 | + | |
8982 | + /* UDBA tests */ | |
5527c038 | 8983 | + if (unlikely(!!inode != d_is_positive(h_dentry))) |
1facf9fc | 8984 | + goto err; |
8985 | + | |
5527c038 JR |
8986 | + h_inode = NULL; |
8987 | + if (d_is_positive(h_dentry)) | |
8988 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 8989 | + h_plus = plus; |
8990 | + h_mode = mode; | |
8991 | + h_cached_inode = h_inode; | |
8992 | + if (h_inode) { | |
8993 | + h_mode = (h_inode->i_mode & S_IFMT); | |
8994 | + h_plus = (h_inode->i_nlink > 0); | |
8995 | + } | |
8996 | + if (inode && ibs <= bindex && bindex <= ibe) | |
8997 | + h_cached_inode = au_h_iptr(inode, bindex); | |
8998 | + | |
523b37e3 | 8999 | + if (!h_nfs) { |
38d290e6 | 9000 | + if (unlikely(plus != h_plus && !tmpfile)) |
523b37e3 AM |
9001 | + goto err; |
9002 | + } else { | |
9003 | + if (unlikely(!(h_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
9004 | + && !is_root | |
9005 | + && !IS_ROOT(h_dentry) | |
9006 | + && unhashed != d_unhashed(h_dentry))) | |
9007 | + goto err; | |
9008 | + } | |
9009 | + if (unlikely(mode != h_mode | |
1facf9fc | 9010 | + || h_cached_inode != h_inode)) |
9011 | + goto err; | |
9012 | + continue; | |
9013 | + | |
f6b6e03d | 9014 | +err: |
1facf9fc | 9015 | + err = -EINVAL; |
9016 | + break; | |
9017 | + } | |
9018 | + | |
523b37e3 | 9019 | + AuTraceErr(err); |
1facf9fc | 9020 | + return err; |
9021 | +} | |
9022 | + | |
027c5e7a | 9023 | +/* todo: consolidate with do_refresh() and au_reval_for_attr() */ |
1facf9fc | 9024 | +static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen) |
9025 | +{ | |
9026 | + int err; | |
9027 | + struct dentry *parent; | |
1facf9fc | 9028 | + |
027c5e7a | 9029 | + if (!au_digen_test(dentry, sigen)) |
1facf9fc | 9030 | + return 0; |
9031 | + | |
9032 | + parent = dget_parent(dentry); | |
9033 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 9034 | + AuDebugOn(au_digen_test(parent, sigen)); |
1facf9fc | 9035 | + au_dbg_verify_gen(parent, sigen); |
027c5e7a | 9036 | + err = au_refresh_dentry(dentry, parent); |
1facf9fc | 9037 | + di_read_unlock(parent, AuLock_IR); |
9038 | + dput(parent); | |
027c5e7a | 9039 | + AuTraceErr(err); |
1facf9fc | 9040 | + return err; |
9041 | +} | |
9042 | + | |
9043 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen) | |
9044 | +{ | |
9045 | + int err; | |
9046 | + struct dentry *d, *parent; | |
1facf9fc | 9047 | + |
027c5e7a | 9048 | + if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR)) |
1facf9fc | 9049 | + return simple_reval_dpath(dentry, sigen); |
9050 | + | |
9051 | + /* slow loop, keep it simple and stupid */ | |
9052 | + /* cf: au_cpup_dirs() */ | |
9053 | + err = 0; | |
9054 | + parent = NULL; | |
027c5e7a | 9055 | + while (au_digen_test(dentry, sigen)) { |
1facf9fc | 9056 | + d = dentry; |
9057 | + while (1) { | |
9058 | + dput(parent); | |
9059 | + parent = dget_parent(d); | |
027c5e7a | 9060 | + if (!au_digen_test(parent, sigen)) |
1facf9fc | 9061 | + break; |
9062 | + d = parent; | |
9063 | + } | |
9064 | + | |
1facf9fc | 9065 | + if (d != dentry) |
027c5e7a | 9066 | + di_write_lock_child2(d); |
1facf9fc | 9067 | + |
9068 | + /* someone might update our dentry while we were sleeping */ | |
027c5e7a AM |
9069 | + if (au_digen_test(d, sigen)) { |
9070 | + /* | |
9071 | + * todo: consolidate with simple_reval_dpath(), | |
9072 | + * do_refresh() and au_reval_for_attr(). | |
9073 | + */ | |
1facf9fc | 9074 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a | 9075 | + err = au_refresh_dentry(d, parent); |
1facf9fc | 9076 | + di_read_unlock(parent, AuLock_IR); |
9077 | + } | |
9078 | + | |
9079 | + if (d != dentry) | |
9080 | + di_write_unlock(d); | |
9081 | + dput(parent); | |
9082 | + if (unlikely(err)) | |
9083 | + break; | |
9084 | + } | |
9085 | + | |
9086 | + return err; | |
9087 | +} | |
9088 | + | |
9089 | +/* | |
9090 | + * if valid returns 1, otherwise 0. | |
9091 | + */ | |
b4510431 | 9092 | +static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1facf9fc | 9093 | +{ |
9094 | + int valid, err; | |
9095 | + unsigned int sigen; | |
8b6a4947 | 9096 | + unsigned char do_udba, dirren; |
1facf9fc | 9097 | + struct super_block *sb; |
9098 | + struct inode *inode; | |
9099 | + | |
027c5e7a | 9100 | + /* todo: support rcu-walk? */ |
b4510431 | 9101 | + if (flags & LOOKUP_RCU) |
027c5e7a AM |
9102 | + return -ECHILD; |
9103 | + | |
9104 | + valid = 0; | |
9105 | + if (unlikely(!au_di(dentry))) | |
9106 | + goto out; | |
9107 | + | |
e49829fe | 9108 | + valid = 1; |
1facf9fc | 9109 | + sb = dentry->d_sb; |
e49829fe JR |
9110 | + /* |
9111 | + * todo: very ugly | |
9112 | + * i_mutex of parent dir may be held, | |
9113 | + * but we should not return 'invalid' due to busy. | |
9114 | + */ | |
9115 | + err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM); | |
9116 | + if (unlikely(err)) { | |
9117 | + valid = err; | |
027c5e7a | 9118 | + AuTraceErr(err); |
e49829fe JR |
9119 | + goto out; |
9120 | + } | |
5527c038 JR |
9121 | + inode = NULL; |
9122 | + if (d_really_is_positive(dentry)) | |
9123 | + inode = d_inode(dentry); | |
5afbbe0d | 9124 | + if (unlikely(inode && au_is_bad_inode(inode))) { |
c1595e42 JR |
9125 | + err = -EINVAL; |
9126 | + AuTraceErr(err); | |
9127 | + goto out_dgrade; | |
9128 | + } | |
027c5e7a AM |
9129 | + if (unlikely(au_dbrange_test(dentry))) { |
9130 | + err = -EINVAL; | |
9131 | + AuTraceErr(err); | |
9132 | + goto out_dgrade; | |
1facf9fc | 9133 | + } |
027c5e7a AM |
9134 | + |
9135 | + sigen = au_sigen(sb); | |
9136 | + if (au_digen_test(dentry, sigen)) { | |
1facf9fc | 9137 | + AuDebugOn(IS_ROOT(dentry)); |
027c5e7a AM |
9138 | + err = au_reval_dpath(dentry, sigen); |
9139 | + if (unlikely(err)) { | |
9140 | + AuTraceErr(err); | |
1facf9fc | 9141 | + goto out_dgrade; |
027c5e7a | 9142 | + } |
1facf9fc | 9143 | + } |
9144 | + di_downgrade_lock(dentry, AuLock_IR); | |
9145 | + | |
1facf9fc | 9146 | + err = -EINVAL; |
c1595e42 | 9147 | + if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY)) |
523b37e3 | 9148 | + && inode |
38d290e6 | 9149 | + && !(inode->i_state && I_LINKABLE) |
79b8bda9 AM |
9150 | + && (IS_DEADDIR(inode) || !inode->i_nlink)) { |
9151 | + AuTraceErr(err); | |
027c5e7a | 9152 | + goto out_inval; |
79b8bda9 | 9153 | + } |
027c5e7a | 9154 | + |
1facf9fc | 9155 | + do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE); |
9156 | + if (do_udba && inode) { | |
5afbbe0d | 9157 | + aufs_bindex_t btop = au_ibtop(inode); |
027c5e7a | 9158 | + struct inode *h_inode; |
1facf9fc | 9159 | + |
5afbbe0d AM |
9160 | + if (btop >= 0) { |
9161 | + h_inode = au_h_iptr(inode, btop); | |
79b8bda9 AM |
9162 | + if (h_inode && au_test_higen(inode, h_inode)) { |
9163 | + AuTraceErr(err); | |
027c5e7a | 9164 | + goto out_inval; |
79b8bda9 | 9165 | + } |
027c5e7a | 9166 | + } |
1facf9fc | 9167 | + } |
9168 | + | |
8b6a4947 AM |
9169 | + dirren = !!au_opt_test(au_mntflags(sb), DIRREN); |
9170 | + err = h_d_revalidate(dentry, inode, flags, do_udba, dirren); | |
5afbbe0d | 9171 | + if (unlikely(!err && do_udba && au_dbtop(dentry) < 0)) { |
1facf9fc | 9172 | + err = -EIO; |
523b37e3 AM |
9173 | + AuDbg("both of real entry and whiteout found, %p, err %d\n", |
9174 | + dentry, err); | |
027c5e7a | 9175 | + } |
e49829fe | 9176 | + goto out_inval; |
1facf9fc | 9177 | + |
4f0767ce | 9178 | +out_dgrade: |
1facf9fc | 9179 | + di_downgrade_lock(dentry, AuLock_IR); |
e49829fe | 9180 | +out_inval: |
1facf9fc | 9181 | + aufs_read_unlock(dentry, AuLock_IR); |
9182 | + AuTraceErr(err); | |
9183 | + valid = !err; | |
e49829fe | 9184 | +out: |
027c5e7a | 9185 | + if (!valid) { |
523b37e3 | 9186 | + AuDbg("%pd invalid, %d\n", dentry, valid); |
027c5e7a AM |
9187 | + d_drop(dentry); |
9188 | + } | |
1facf9fc | 9189 | + return valid; |
9190 | +} | |
9191 | + | |
9192 | +static void aufs_d_release(struct dentry *dentry) | |
9193 | +{ | |
027c5e7a | 9194 | + if (au_di(dentry)) { |
4a4d8108 AM |
9195 | + au_di_fin(dentry); |
9196 | + au_hn_di_reinit(dentry); | |
1facf9fc | 9197 | + } |
1facf9fc | 9198 | +} |
9199 | + | |
4a4d8108 | 9200 | +const struct dentry_operations aufs_dop = { |
c06a8ce3 AM |
9201 | + .d_revalidate = aufs_d_revalidate, |
9202 | + .d_weak_revalidate = aufs_d_revalidate, | |
9203 | + .d_release = aufs_d_release | |
1facf9fc | 9204 | +}; |
79b8bda9 AM |
9205 | + |
9206 | +/* aufs_dop without d_revalidate */ | |
9207 | +const struct dentry_operations aufs_dop_noreval = { | |
9208 | + .d_release = aufs_d_release | |
9209 | +}; | |
7f207e10 | 9210 | diff -urN /usr/share/empty/fs/aufs/dentry.h linux/fs/aufs/dentry.h |
eca34b5c | 9211 | --- /usr/share/empty/fs/aufs/dentry.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 9212 | +++ linux/fs/aufs/dentry.h 2020-01-27 10:57:18.168871450 +0100 |
9f237c51 | 9213 | @@ -0,0 +1,268 @@ |
062440b3 | 9214 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 9215 | +/* |
016522bc | 9216 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 9217 | + * |
9218 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9219 | + * it under the terms of the GNU General Public License as published by | |
9220 | + * the Free Software Foundation; either version 2 of the License, or | |
9221 | + * (at your option) any later version. | |
dece6358 AM |
9222 | + * |
9223 | + * This program is distributed in the hope that it will be useful, | |
9224 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9225 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9226 | + * GNU General Public License for more details. | |
9227 | + * | |
9228 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 9229 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 9230 | + */ |
9231 | + | |
9232 | +/* | |
9233 | + * lookup and dentry operations | |
9234 | + */ | |
9235 | + | |
9236 | +#ifndef __AUFS_DENTRY_H__ | |
9237 | +#define __AUFS_DENTRY_H__ | |
9238 | + | |
9239 | +#ifdef __KERNEL__ | |
9240 | + | |
dece6358 | 9241 | +#include <linux/dcache.h> |
8b6a4947 | 9242 | +#include "dirren.h" |
1facf9fc | 9243 | +#include "rwsem.h" |
9244 | + | |
1facf9fc | 9245 | +struct au_hdentry { |
9246 | + struct dentry *hd_dentry; | |
027c5e7a | 9247 | + aufs_bindex_t hd_id; |
1facf9fc | 9248 | +}; |
9249 | + | |
9250 | +struct au_dinfo { | |
9251 | + atomic_t di_generation; | |
9252 | + | |
dece6358 | 9253 | + struct au_rwsem di_rwsem; |
5afbbe0d | 9254 | + aufs_bindex_t di_btop, di_bbot, di_bwh, di_bdiropq; |
38d290e6 | 9255 | + unsigned char di_tmpfile; /* to allow the different name */ |
1c60b727 | 9256 | + struct au_hdentry *di_hdentry; |
9f237c51 | 9257 | + struct rcu_head rcu; |
4a4d8108 | 9258 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 9259 | + |
9260 | +/* ---------------------------------------------------------------------- */ | |
9261 | + | |
5afbbe0d AM |
9262 | +/* flags for au_lkup_dentry() */ |
9263 | +#define AuLkup_ALLOW_NEG 1 | |
9264 | +#define AuLkup_IGNORE_PERM (1 << 1) | |
8b6a4947 | 9265 | +#define AuLkup_DIRREN (1 << 2) |
5afbbe0d AM |
9266 | +#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name) |
9267 | +#define au_fset_lkup(flags, name) \ | |
9268 | + do { (flags) |= AuLkup_##name; } while (0) | |
9269 | +#define au_fclr_lkup(flags, name) \ | |
9270 | + do { (flags) &= ~AuLkup_##name; } while (0) | |
9271 | + | |
8b6a4947 AM |
9272 | +#ifndef CONFIG_AUFS_DIRREN |
9273 | +#undef AuLkup_DIRREN | |
9274 | +#define AuLkup_DIRREN 0 | |
9275 | +#endif | |
9276 | + | |
9277 | +struct au_do_lookup_args { | |
9278 | + unsigned int flags; | |
9279 | + mode_t type; | |
9280 | + struct qstr whname, *name; | |
9281 | + struct au_dr_lookup dirren; | |
9282 | +}; | |
9283 | + | |
5afbbe0d AM |
9284 | +/* ---------------------------------------------------------------------- */ |
9285 | + | |
1facf9fc | 9286 | +/* dentry.c */ |
79b8bda9 | 9287 | +extern const struct dentry_operations aufs_dop, aufs_dop_noreval; |
1facf9fc | 9288 | +struct au_branch; |
076b876e | 9289 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent); |
1facf9fc | 9290 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, |
9291 | + struct dentry *h_parent, struct au_branch *br); | |
9292 | + | |
5afbbe0d AM |
9293 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, |
9294 | + unsigned int flags); | |
86dc4139 | 9295 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh); |
027c5e7a | 9296 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent); |
1facf9fc | 9297 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen); |
79b8bda9 | 9298 | +void au_refresh_dop(struct dentry *dentry, int force_reval); |
1facf9fc | 9299 | + |
9300 | +/* dinfo.c */ | |
4a4d8108 | 9301 | +void au_di_init_once(void *_di); |
027c5e7a AM |
9302 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc); |
9303 | +void au_di_free(struct au_dinfo *dinfo); | |
9304 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b); | |
9305 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src); | |
4a4d8108 AM |
9306 | +int au_di_init(struct dentry *dentry); |
9307 | +void au_di_fin(struct dentry *dentry); | |
e2f27e51 | 9308 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink); |
1facf9fc | 9309 | + |
9310 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc); | |
9311 | +void di_read_unlock(struct dentry *d, int flags); | |
9312 | +void di_downgrade_lock(struct dentry *d, int flags); | |
9313 | +void di_write_lock(struct dentry *d, unsigned int lsc); | |
9314 | +void di_write_unlock(struct dentry *d); | |
9315 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir); | |
9316 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir); | |
9317 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2); | |
9318 | + | |
9319 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex); | |
2cbb1c4b | 9320 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex); |
1facf9fc | 9321 | +aufs_bindex_t au_dbtail(struct dentry *dentry); |
9322 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry); | |
9323 | + | |
9324 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
9325 | + struct dentry *h_dentry); | |
027c5e7a AM |
9326 | +int au_digen_test(struct dentry *dentry, unsigned int sigen); |
9327 | +int au_dbrange_test(struct dentry *dentry); | |
1facf9fc | 9328 | +void au_update_digen(struct dentry *dentry); |
9329 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero); | |
5afbbe0d AM |
9330 | +void au_update_dbtop(struct dentry *dentry); |
9331 | +void au_update_dbbot(struct dentry *dentry); | |
1facf9fc | 9332 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry); |
9333 | + | |
9334 | +/* ---------------------------------------------------------------------- */ | |
9335 | + | |
9336 | +static inline struct au_dinfo *au_di(struct dentry *dentry) | |
9337 | +{ | |
9338 | + return dentry->d_fsdata; | |
9339 | +} | |
9340 | + | |
9341 | +/* ---------------------------------------------------------------------- */ | |
9342 | + | |
9343 | +/* lock subclass for dinfo */ | |
9344 | +enum { | |
9345 | + AuLsc_DI_CHILD, /* child first */ | |
4a4d8108 | 9346 | + AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */ |
1facf9fc | 9347 | + AuLsc_DI_CHILD3, /* copyup dirs */ |
9348 | + AuLsc_DI_PARENT, | |
9349 | + AuLsc_DI_PARENT2, | |
027c5e7a AM |
9350 | + AuLsc_DI_PARENT3, |
9351 | + AuLsc_DI_TMP /* temp for replacing dinfo */ | |
1facf9fc | 9352 | +}; |
9353 | + | |
9354 | +/* | |
9355 | + * di_read_lock_child, di_write_lock_child, | |
9356 | + * di_read_lock_child2, di_write_lock_child2, | |
9357 | + * di_read_lock_child3, di_write_lock_child3, | |
9358 | + * di_read_lock_parent, di_write_lock_parent, | |
9359 | + * di_read_lock_parent2, di_write_lock_parent2, | |
9360 | + * di_read_lock_parent3, di_write_lock_parent3, | |
9361 | + */ | |
9362 | +#define AuReadLockFunc(name, lsc) \ | |
9363 | +static inline void di_read_lock_##name(struct dentry *d, int flags) \ | |
9364 | +{ di_read_lock(d, flags, AuLsc_DI_##lsc); } | |
9365 | + | |
9366 | +#define AuWriteLockFunc(name, lsc) \ | |
9367 | +static inline void di_write_lock_##name(struct dentry *d) \ | |
9368 | +{ di_write_lock(d, AuLsc_DI_##lsc); } | |
9369 | + | |
9370 | +#define AuRWLockFuncs(name, lsc) \ | |
9371 | + AuReadLockFunc(name, lsc) \ | |
9372 | + AuWriteLockFunc(name, lsc) | |
9373 | + | |
9374 | +AuRWLockFuncs(child, CHILD); | |
9375 | +AuRWLockFuncs(child2, CHILD2); | |
9376 | +AuRWLockFuncs(child3, CHILD3); | |
9377 | +AuRWLockFuncs(parent, PARENT); | |
9378 | +AuRWLockFuncs(parent2, PARENT2); | |
9379 | +AuRWLockFuncs(parent3, PARENT3); | |
9380 | + | |
9381 | +#undef AuReadLockFunc | |
9382 | +#undef AuWriteLockFunc | |
9383 | +#undef AuRWLockFuncs | |
9384 | + | |
9385 | +#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem) | |
dece6358 AM |
9386 | +#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem) |
9387 | +#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem) | |
1facf9fc | 9388 | + |
9389 | +/* ---------------------------------------------------------------------- */ | |
9390 | + | |
9391 | +/* todo: memory barrier? */ | |
9392 | +static inline unsigned int au_digen(struct dentry *d) | |
9393 | +{ | |
9394 | + return atomic_read(&au_di(d)->di_generation); | |
9395 | +} | |
9396 | + | |
9397 | +static inline void au_h_dentry_init(struct au_hdentry *hdentry) | |
9398 | +{ | |
9399 | + hdentry->hd_dentry = NULL; | |
9400 | +} | |
9401 | + | |
5afbbe0d AM |
9402 | +static inline struct au_hdentry *au_hdentry(struct au_dinfo *di, |
9403 | + aufs_bindex_t bindex) | |
9404 | +{ | |
9405 | + return di->di_hdentry + bindex; | |
9406 | +} | |
9407 | + | |
1facf9fc | 9408 | +static inline void au_hdput(struct au_hdentry *hd) |
9409 | +{ | |
4a4d8108 AM |
9410 | + if (hd) |
9411 | + dput(hd->hd_dentry); | |
1facf9fc | 9412 | +} |
9413 | + | |
5afbbe0d | 9414 | +static inline aufs_bindex_t au_dbtop(struct dentry *dentry) |
1facf9fc | 9415 | +{ |
1308ab2a | 9416 | + DiMustAnyLock(dentry); |
5afbbe0d | 9417 | + return au_di(dentry)->di_btop; |
1facf9fc | 9418 | +} |
9419 | + | |
5afbbe0d | 9420 | +static inline aufs_bindex_t au_dbbot(struct dentry *dentry) |
1facf9fc | 9421 | +{ |
1308ab2a | 9422 | + DiMustAnyLock(dentry); |
5afbbe0d | 9423 | + return au_di(dentry)->di_bbot; |
1facf9fc | 9424 | +} |
9425 | + | |
9426 | +static inline aufs_bindex_t au_dbwh(struct dentry *dentry) | |
9427 | +{ | |
1308ab2a | 9428 | + DiMustAnyLock(dentry); |
1facf9fc | 9429 | + return au_di(dentry)->di_bwh; |
9430 | +} | |
9431 | + | |
9432 | +static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry) | |
9433 | +{ | |
1308ab2a | 9434 | + DiMustAnyLock(dentry); |
1facf9fc | 9435 | + return au_di(dentry)->di_bdiropq; |
9436 | +} | |
9437 | + | |
9438 | +/* todo: hard/soft set? */ | |
5afbbe0d | 9439 | +static inline void au_set_dbtop(struct dentry *dentry, aufs_bindex_t bindex) |
1facf9fc | 9440 | +{ |
1308ab2a | 9441 | + DiMustWriteLock(dentry); |
5afbbe0d | 9442 | + au_di(dentry)->di_btop = bindex; |
1facf9fc | 9443 | +} |
9444 | + | |
5afbbe0d | 9445 | +static inline void au_set_dbbot(struct dentry *dentry, aufs_bindex_t bindex) |
1facf9fc | 9446 | +{ |
1308ab2a | 9447 | + DiMustWriteLock(dentry); |
5afbbe0d | 9448 | + au_di(dentry)->di_bbot = bindex; |
1facf9fc | 9449 | +} |
9450 | + | |
9451 | +static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex) | |
9452 | +{ | |
1308ab2a | 9453 | + DiMustWriteLock(dentry); |
5afbbe0d | 9454 | + /* dbwh can be outside of btop - bbot range */ |
1facf9fc | 9455 | + au_di(dentry)->di_bwh = bindex; |
9456 | +} | |
9457 | + | |
9458 | +static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex) | |
9459 | +{ | |
1308ab2a | 9460 | + DiMustWriteLock(dentry); |
1facf9fc | 9461 | + au_di(dentry)->di_bdiropq = bindex; |
9462 | +} | |
9463 | + | |
9464 | +/* ---------------------------------------------------------------------- */ | |
9465 | + | |
4a4d8108 | 9466 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 9467 | +static inline void au_digen_dec(struct dentry *d) |
9468 | +{ | |
e49829fe | 9469 | + atomic_dec(&au_di(d)->di_generation); |
1facf9fc | 9470 | +} |
9471 | + | |
4a4d8108 | 9472 | +static inline void au_hn_di_reinit(struct dentry *dentry) |
1facf9fc | 9473 | +{ |
9474 | + dentry->d_fsdata = NULL; | |
9475 | +} | |
9476 | +#else | |
4a4d8108 AM |
9477 | +AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused) |
9478 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
1facf9fc | 9479 | + |
9480 | +#endif /* __KERNEL__ */ | |
9481 | +#endif /* __AUFS_DENTRY_H__ */ | |
7f207e10 | 9482 | diff -urN /usr/share/empty/fs/aufs/dinfo.c linux/fs/aufs/dinfo.c |
eca34b5c | 9483 | --- /usr/share/empty/fs/aufs/dinfo.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 9484 | +++ linux/fs/aufs/dinfo.c 2020-01-27 10:57:18.168871450 +0100 |
062440b3 | 9485 | @@ -0,0 +1,554 @@ |
cd7a4cd9 | 9486 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 9487 | +/* |
016522bc | 9488 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 9489 | + * |
9490 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9491 | + * it under the terms of the GNU General Public License as published by | |
9492 | + * the Free Software Foundation; either version 2 of the License, or | |
9493 | + * (at your option) any later version. | |
dece6358 AM |
9494 | + * |
9495 | + * This program is distributed in the hope that it will be useful, | |
9496 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9497 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9498 | + * GNU General Public License for more details. | |
9499 | + * | |
9500 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 9501 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 9502 | + */ |
9503 | + | |
9504 | +/* | |
9505 | + * dentry private data | |
9506 | + */ | |
9507 | + | |
9508 | +#include "aufs.h" | |
9509 | + | |
e49829fe | 9510 | +void au_di_init_once(void *_dinfo) |
4a4d8108 | 9511 | +{ |
e49829fe | 9512 | + struct au_dinfo *dinfo = _dinfo; |
4a4d8108 | 9513 | + |
e49829fe | 9514 | + au_rw_init(&dinfo->di_rwsem); |
4a4d8108 AM |
9515 | +} |
9516 | + | |
027c5e7a | 9517 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc) |
1facf9fc | 9518 | +{ |
9519 | + struct au_dinfo *dinfo; | |
027c5e7a | 9520 | + int nbr, i; |
1facf9fc | 9521 | + |
9522 | + dinfo = au_cache_alloc_dinfo(); | |
9523 | + if (unlikely(!dinfo)) | |
9524 | + goto out; | |
9525 | + | |
5afbbe0d | 9526 | + nbr = au_sbbot(sb) + 1; |
1facf9fc | 9527 | + if (nbr <= 0) |
9528 | + nbr = 1; | |
9529 | + dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS); | |
027c5e7a AM |
9530 | + if (dinfo->di_hdentry) { |
9531 | + au_rw_write_lock_nested(&dinfo->di_rwsem, lsc); | |
5afbbe0d AM |
9532 | + dinfo->di_btop = -1; |
9533 | + dinfo->di_bbot = -1; | |
027c5e7a AM |
9534 | + dinfo->di_bwh = -1; |
9535 | + dinfo->di_bdiropq = -1; | |
38d290e6 | 9536 | + dinfo->di_tmpfile = 0; |
027c5e7a AM |
9537 | + for (i = 0; i < nbr; i++) |
9538 | + dinfo->di_hdentry[i].hd_id = -1; | |
9539 | + goto out; | |
9540 | + } | |
1facf9fc | 9541 | + |
1c60b727 | 9542 | + au_cache_free_dinfo(dinfo); |
027c5e7a AM |
9543 | + dinfo = NULL; |
9544 | + | |
4f0767ce | 9545 | +out: |
027c5e7a | 9546 | + return dinfo; |
1facf9fc | 9547 | +} |
9548 | + | |
027c5e7a | 9549 | +void au_di_free(struct au_dinfo *dinfo) |
4a4d8108 | 9550 | +{ |
4a4d8108 | 9551 | + struct au_hdentry *p; |
5afbbe0d | 9552 | + aufs_bindex_t bbot, bindex; |
4a4d8108 AM |
9553 | + |
9554 | + /* dentry may not be revalidated */ | |
5afbbe0d | 9555 | + bindex = dinfo->di_btop; |
4a4d8108 | 9556 | + if (bindex >= 0) { |
5afbbe0d AM |
9557 | + bbot = dinfo->di_bbot; |
9558 | + p = au_hdentry(dinfo, bindex); | |
9559 | + while (bindex++ <= bbot) | |
4a4d8108 AM |
9560 | + au_hdput(p++); |
9561 | + } | |
9f237c51 | 9562 | + au_kfree_try_rcu(dinfo->di_hdentry); |
1c60b727 | 9563 | + au_cache_free_dinfo(dinfo); |
027c5e7a AM |
9564 | +} |
9565 | + | |
9566 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b) | |
9567 | +{ | |
9568 | + struct au_hdentry *p; | |
9569 | + aufs_bindex_t bi; | |
9570 | + | |
9571 | + AuRwMustWriteLock(&a->di_rwsem); | |
9572 | + AuRwMustWriteLock(&b->di_rwsem); | |
9573 | + | |
9574 | +#define DiSwap(v, name) \ | |
9575 | + do { \ | |
9576 | + v = a->di_##name; \ | |
9577 | + a->di_##name = b->di_##name; \ | |
9578 | + b->di_##name = v; \ | |
9579 | + } while (0) | |
9580 | + | |
9581 | + DiSwap(p, hdentry); | |
5afbbe0d AM |
9582 | + DiSwap(bi, btop); |
9583 | + DiSwap(bi, bbot); | |
027c5e7a AM |
9584 | + DiSwap(bi, bwh); |
9585 | + DiSwap(bi, bdiropq); | |
9586 | + /* smp_mb(); */ | |
9587 | + | |
9588 | +#undef DiSwap | |
9589 | +} | |
9590 | + | |
9591 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src) | |
9592 | +{ | |
9593 | + AuRwMustWriteLock(&dst->di_rwsem); | |
9594 | + AuRwMustWriteLock(&src->di_rwsem); | |
9595 | + | |
5afbbe0d AM |
9596 | + dst->di_btop = src->di_btop; |
9597 | + dst->di_bbot = src->di_bbot; | |
027c5e7a AM |
9598 | + dst->di_bwh = src->di_bwh; |
9599 | + dst->di_bdiropq = src->di_bdiropq; | |
9600 | + /* smp_mb(); */ | |
9601 | +} | |
9602 | + | |
9603 | +int au_di_init(struct dentry *dentry) | |
9604 | +{ | |
9605 | + int err; | |
9606 | + struct super_block *sb; | |
9607 | + struct au_dinfo *dinfo; | |
9608 | + | |
9609 | + err = 0; | |
9610 | + sb = dentry->d_sb; | |
9611 | + dinfo = au_di_alloc(sb, AuLsc_DI_CHILD); | |
9612 | + if (dinfo) { | |
9613 | + atomic_set(&dinfo->di_generation, au_sigen(sb)); | |
9614 | + /* smp_mb(); */ /* atomic_set */ | |
9615 | + dentry->d_fsdata = dinfo; | |
9616 | + } else | |
9617 | + err = -ENOMEM; | |
9618 | + | |
9619 | + return err; | |
9620 | +} | |
9621 | + | |
9622 | +void au_di_fin(struct dentry *dentry) | |
9623 | +{ | |
9624 | + struct au_dinfo *dinfo; | |
9625 | + | |
9626 | + dinfo = au_di(dentry); | |
9627 | + AuRwDestroy(&dinfo->di_rwsem); | |
9628 | + au_di_free(dinfo); | |
4a4d8108 AM |
9629 | +} |
9630 | + | |
e2f27e51 | 9631 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink) |
1facf9fc | 9632 | +{ |
9633 | + int err, sz; | |
9634 | + struct au_hdentry *hdp; | |
9635 | + | |
1308ab2a | 9636 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
9637 | + | |
1facf9fc | 9638 | + err = -ENOMEM; |
5afbbe0d | 9639 | + sz = sizeof(*hdp) * (dinfo->di_bbot + 1); |
1facf9fc | 9640 | + if (!sz) |
9641 | + sz = sizeof(*hdp); | |
e2f27e51 AM |
9642 | + hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS, |
9643 | + may_shrink); | |
1facf9fc | 9644 | + if (hdp) { |
9645 | + dinfo->di_hdentry = hdp; | |
9646 | + err = 0; | |
9647 | + } | |
9648 | + | |
9649 | + return err; | |
9650 | +} | |
9651 | + | |
9652 | +/* ---------------------------------------------------------------------- */ | |
9653 | + | |
9654 | +static void do_ii_write_lock(struct inode *inode, unsigned int lsc) | |
9655 | +{ | |
9656 | + switch (lsc) { | |
9657 | + case AuLsc_DI_CHILD: | |
9658 | + ii_write_lock_child(inode); | |
9659 | + break; | |
9660 | + case AuLsc_DI_CHILD2: | |
9661 | + ii_write_lock_child2(inode); | |
9662 | + break; | |
9663 | + case AuLsc_DI_CHILD3: | |
9664 | + ii_write_lock_child3(inode); | |
9665 | + break; | |
9666 | + case AuLsc_DI_PARENT: | |
9667 | + ii_write_lock_parent(inode); | |
9668 | + break; | |
9669 | + case AuLsc_DI_PARENT2: | |
9670 | + ii_write_lock_parent2(inode); | |
9671 | + break; | |
9672 | + case AuLsc_DI_PARENT3: | |
9673 | + ii_write_lock_parent3(inode); | |
9674 | + break; | |
9675 | + default: | |
9676 | + BUG(); | |
9677 | + } | |
9678 | +} | |
9679 | + | |
9680 | +static void do_ii_read_lock(struct inode *inode, unsigned int lsc) | |
9681 | +{ | |
9682 | + switch (lsc) { | |
9683 | + case AuLsc_DI_CHILD: | |
9684 | + ii_read_lock_child(inode); | |
9685 | + break; | |
9686 | + case AuLsc_DI_CHILD2: | |
9687 | + ii_read_lock_child2(inode); | |
9688 | + break; | |
9689 | + case AuLsc_DI_CHILD3: | |
9690 | + ii_read_lock_child3(inode); | |
9691 | + break; | |
9692 | + case AuLsc_DI_PARENT: | |
9693 | + ii_read_lock_parent(inode); | |
9694 | + break; | |
9695 | + case AuLsc_DI_PARENT2: | |
9696 | + ii_read_lock_parent2(inode); | |
9697 | + break; | |
9698 | + case AuLsc_DI_PARENT3: | |
9699 | + ii_read_lock_parent3(inode); | |
9700 | + break; | |
9701 | + default: | |
9702 | + BUG(); | |
9703 | + } | |
9704 | +} | |
9705 | + | |
9706 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc) | |
9707 | +{ | |
5527c038 JR |
9708 | + struct inode *inode; |
9709 | + | |
dece6358 | 9710 | + au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc); |
5527c038 JR |
9711 | + if (d_really_is_positive(d)) { |
9712 | + inode = d_inode(d); | |
1facf9fc | 9713 | + if (au_ftest_lock(flags, IW)) |
5527c038 | 9714 | + do_ii_write_lock(inode, lsc); |
1facf9fc | 9715 | + else if (au_ftest_lock(flags, IR)) |
5527c038 | 9716 | + do_ii_read_lock(inode, lsc); |
1facf9fc | 9717 | + } |
9718 | +} | |
9719 | + | |
9720 | +void di_read_unlock(struct dentry *d, int flags) | |
9721 | +{ | |
5527c038 JR |
9722 | + struct inode *inode; |
9723 | + | |
9724 | + if (d_really_is_positive(d)) { | |
9725 | + inode = d_inode(d); | |
027c5e7a AM |
9726 | + if (au_ftest_lock(flags, IW)) { |
9727 | + au_dbg_verify_dinode(d); | |
5527c038 | 9728 | + ii_write_unlock(inode); |
027c5e7a AM |
9729 | + } else if (au_ftest_lock(flags, IR)) { |
9730 | + au_dbg_verify_dinode(d); | |
5527c038 | 9731 | + ii_read_unlock(inode); |
027c5e7a | 9732 | + } |
1facf9fc | 9733 | + } |
dece6358 | 9734 | + au_rw_read_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 9735 | +} |
9736 | + | |
9737 | +void di_downgrade_lock(struct dentry *d, int flags) | |
9738 | +{ | |
5527c038 JR |
9739 | + if (d_really_is_positive(d) && au_ftest_lock(flags, IR)) |
9740 | + ii_downgrade_lock(d_inode(d)); | |
dece6358 | 9741 | + au_rw_dgrade_lock(&au_di(d)->di_rwsem); |
1facf9fc | 9742 | +} |
9743 | + | |
9744 | +void di_write_lock(struct dentry *d, unsigned int lsc) | |
9745 | +{ | |
dece6358 | 9746 | + au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc); |
5527c038 JR |
9747 | + if (d_really_is_positive(d)) |
9748 | + do_ii_write_lock(d_inode(d), lsc); | |
1facf9fc | 9749 | +} |
9750 | + | |
9751 | +void di_write_unlock(struct dentry *d) | |
9752 | +{ | |
027c5e7a | 9753 | + au_dbg_verify_dinode(d); |
5527c038 JR |
9754 | + if (d_really_is_positive(d)) |
9755 | + ii_write_unlock(d_inode(d)); | |
dece6358 | 9756 | + au_rw_write_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 9757 | +} |
9758 | + | |
9759 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir) | |
9760 | +{ | |
9761 | + AuDebugOn(d1 == d2 | |
5527c038 | 9762 | + || d_inode(d1) == d_inode(d2) |
1facf9fc | 9763 | + || d1->d_sb != d2->d_sb); |
9764 | + | |
521ced18 JR |
9765 | + if ((isdir && au_test_subdir(d1, d2)) |
9766 | + || d1 < d2) { | |
1facf9fc | 9767 | + di_write_lock_child(d1); |
9768 | + di_write_lock_child2(d2); | |
9769 | + } else { | |
1facf9fc | 9770 | + di_write_lock_child(d2); |
9771 | + di_write_lock_child2(d1); | |
9772 | + } | |
9773 | +} | |
9774 | + | |
9775 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir) | |
9776 | +{ | |
9777 | + AuDebugOn(d1 == d2 | |
5527c038 | 9778 | + || d_inode(d1) == d_inode(d2) |
1facf9fc | 9779 | + || d1->d_sb != d2->d_sb); |
9780 | + | |
521ced18 JR |
9781 | + if ((isdir && au_test_subdir(d1, d2)) |
9782 | + || d1 < d2) { | |
1facf9fc | 9783 | + di_write_lock_parent(d1); |
9784 | + di_write_lock_parent2(d2); | |
9785 | + } else { | |
1facf9fc | 9786 | + di_write_lock_parent(d2); |
9787 | + di_write_lock_parent2(d1); | |
9788 | + } | |
9789 | +} | |
9790 | + | |
9791 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2) | |
9792 | +{ | |
9793 | + di_write_unlock(d1); | |
5527c038 | 9794 | + if (d_inode(d1) == d_inode(d2)) |
dece6358 | 9795 | + au_rw_write_unlock(&au_di(d2)->di_rwsem); |
1facf9fc | 9796 | + else |
9797 | + di_write_unlock(d2); | |
9798 | +} | |
9799 | + | |
9800 | +/* ---------------------------------------------------------------------- */ | |
9801 | + | |
9802 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex) | |
9803 | +{ | |
9804 | + struct dentry *d; | |
9805 | + | |
1308ab2a | 9806 | + DiMustAnyLock(dentry); |
9807 | + | |
5afbbe0d | 9808 | + if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) |
1facf9fc | 9809 | + return NULL; |
9810 | + AuDebugOn(bindex < 0); | |
5afbbe0d | 9811 | + d = au_hdentry(au_di(dentry), bindex)->hd_dentry; |
c1595e42 | 9812 | + AuDebugOn(d && au_dcount(d) <= 0); |
1facf9fc | 9813 | + return d; |
9814 | +} | |
9815 | + | |
2cbb1c4b JR |
9816 | +/* |
9817 | + * extended version of au_h_dptr(). | |
38d290e6 JR |
9818 | + * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or |
9819 | + * error. | |
2cbb1c4b JR |
9820 | + */ |
9821 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex) | |
9822 | +{ | |
9823 | + struct dentry *h_dentry; | |
9824 | + struct inode *inode, *h_inode; | |
9825 | + | |
5527c038 | 9826 | + AuDebugOn(d_really_is_negative(dentry)); |
2cbb1c4b JR |
9827 | + |
9828 | + h_dentry = NULL; | |
5afbbe0d AM |
9829 | + if (au_dbtop(dentry) <= bindex |
9830 | + && bindex <= au_dbbot(dentry)) | |
2cbb1c4b | 9831 | + h_dentry = au_h_dptr(dentry, bindex); |
38d290e6 | 9832 | + if (h_dentry && !au_d_linkable(h_dentry)) { |
2cbb1c4b JR |
9833 | + dget(h_dentry); |
9834 | + goto out; /* success */ | |
9835 | + } | |
9836 | + | |
5527c038 | 9837 | + inode = d_inode(dentry); |
5afbbe0d AM |
9838 | + AuDebugOn(bindex < au_ibtop(inode)); |
9839 | + AuDebugOn(au_ibbot(inode) < bindex); | |
2cbb1c4b JR |
9840 | + h_inode = au_h_iptr(inode, bindex); |
9841 | + h_dentry = d_find_alias(h_inode); | |
9842 | + if (h_dentry) { | |
9843 | + if (!IS_ERR(h_dentry)) { | |
38d290e6 | 9844 | + if (!au_d_linkable(h_dentry)) |
2cbb1c4b JR |
9845 | + goto out; /* success */ |
9846 | + dput(h_dentry); | |
9847 | + } else | |
9848 | + goto out; | |
9849 | + } | |
9850 | + | |
9851 | + if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) { | |
9852 | + h_dentry = au_plink_lkup(inode, bindex); | |
9853 | + AuDebugOn(!h_dentry); | |
9854 | + if (!IS_ERR(h_dentry)) { | |
9855 | + if (!au_d_hashed_positive(h_dentry)) | |
9856 | + goto out; /* success */ | |
9857 | + dput(h_dentry); | |
9858 | + h_dentry = NULL; | |
9859 | + } | |
9860 | + } | |
9861 | + | |
9862 | +out: | |
9863 | + AuDbgDentry(h_dentry); | |
9864 | + return h_dentry; | |
9865 | +} | |
9866 | + | |
1facf9fc | 9867 | +aufs_bindex_t au_dbtail(struct dentry *dentry) |
9868 | +{ | |
5afbbe0d | 9869 | + aufs_bindex_t bbot, bwh; |
1facf9fc | 9870 | + |
5afbbe0d AM |
9871 | + bbot = au_dbbot(dentry); |
9872 | + if (0 <= bbot) { | |
1facf9fc | 9873 | + bwh = au_dbwh(dentry); |
9874 | + if (!bwh) | |
9875 | + return bwh; | |
5afbbe0d | 9876 | + if (0 < bwh && bwh < bbot) |
1facf9fc | 9877 | + return bwh - 1; |
9878 | + } | |
5afbbe0d | 9879 | + return bbot; |
1facf9fc | 9880 | +} |
9881 | + | |
9882 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry) | |
9883 | +{ | |
5afbbe0d | 9884 | + aufs_bindex_t bbot, bopq; |
1facf9fc | 9885 | + |
5afbbe0d AM |
9886 | + bbot = au_dbtail(dentry); |
9887 | + if (0 <= bbot) { | |
1facf9fc | 9888 | + bopq = au_dbdiropq(dentry); |
5afbbe0d AM |
9889 | + if (0 <= bopq && bopq < bbot) |
9890 | + bbot = bopq; | |
1facf9fc | 9891 | + } |
5afbbe0d | 9892 | + return bbot; |
1facf9fc | 9893 | +} |
9894 | + | |
9895 | +/* ---------------------------------------------------------------------- */ | |
9896 | + | |
9897 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
9898 | + struct dentry *h_dentry) | |
9899 | +{ | |
5afbbe0d AM |
9900 | + struct au_dinfo *dinfo; |
9901 | + struct au_hdentry *hd; | |
027c5e7a | 9902 | + struct au_branch *br; |
1facf9fc | 9903 | + |
1308ab2a | 9904 | + DiMustWriteLock(dentry); |
9905 | + | |
5afbbe0d AM |
9906 | + dinfo = au_di(dentry); |
9907 | + hd = au_hdentry(dinfo, bindex); | |
4a4d8108 | 9908 | + au_hdput(hd); |
1facf9fc | 9909 | + hd->hd_dentry = h_dentry; |
027c5e7a AM |
9910 | + if (h_dentry) { |
9911 | + br = au_sbr(dentry->d_sb, bindex); | |
9912 | + hd->hd_id = br->br_id; | |
9913 | + } | |
9914 | +} | |
9915 | + | |
9916 | +int au_dbrange_test(struct dentry *dentry) | |
9917 | +{ | |
9918 | + int err; | |
5afbbe0d | 9919 | + aufs_bindex_t btop, bbot; |
027c5e7a AM |
9920 | + |
9921 | + err = 0; | |
5afbbe0d AM |
9922 | + btop = au_dbtop(dentry); |
9923 | + bbot = au_dbbot(dentry); | |
9924 | + if (btop >= 0) | |
9925 | + AuDebugOn(bbot < 0 && btop > bbot); | |
027c5e7a AM |
9926 | + else { |
9927 | + err = -EIO; | |
5afbbe0d | 9928 | + AuDebugOn(bbot >= 0); |
027c5e7a AM |
9929 | + } |
9930 | + | |
9931 | + return err; | |
9932 | +} | |
9933 | + | |
9934 | +int au_digen_test(struct dentry *dentry, unsigned int sigen) | |
9935 | +{ | |
9936 | + int err; | |
9937 | + | |
9938 | + err = 0; | |
9939 | + if (unlikely(au_digen(dentry) != sigen | |
5527c038 | 9940 | + || au_iigen_test(d_inode(dentry), sigen))) |
027c5e7a AM |
9941 | + err = -EIO; |
9942 | + | |
9943 | + return err; | |
1facf9fc | 9944 | +} |
9945 | + | |
9946 | +void au_update_digen(struct dentry *dentry) | |
9947 | +{ | |
9948 | + atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb)); | |
9949 | + /* smp_mb(); */ /* atomic_set */ | |
9950 | +} | |
9951 | + | |
9952 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero) | |
9953 | +{ | |
9954 | + struct au_dinfo *dinfo; | |
9955 | + struct dentry *h_d; | |
4a4d8108 | 9956 | + struct au_hdentry *hdp; |
5afbbe0d | 9957 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 9958 | + |
1308ab2a | 9959 | + DiMustWriteLock(dentry); |
9960 | + | |
1facf9fc | 9961 | + dinfo = au_di(dentry); |
5afbbe0d | 9962 | + if (!dinfo || dinfo->di_btop < 0) |
1facf9fc | 9963 | + return; |
9964 | + | |
9965 | + if (do_put_zero) { | |
5afbbe0d AM |
9966 | + bbot = dinfo->di_bbot; |
9967 | + bindex = dinfo->di_btop; | |
9968 | + hdp = au_hdentry(dinfo, bindex); | |
9969 | + for (; bindex <= bbot; bindex++, hdp++) { | |
9970 | + h_d = hdp->hd_dentry; | |
5527c038 | 9971 | + if (h_d && d_is_negative(h_d)) |
1facf9fc | 9972 | + au_set_h_dptr(dentry, bindex, NULL); |
9973 | + } | |
9974 | + } | |
9975 | + | |
5afbbe0d AM |
9976 | + dinfo->di_btop = 0; |
9977 | + hdp = au_hdentry(dinfo, dinfo->di_btop); | |
9978 | + for (; dinfo->di_btop <= dinfo->di_bbot; dinfo->di_btop++, hdp++) | |
9979 | + if (hdp->hd_dentry) | |
1facf9fc | 9980 | + break; |
5afbbe0d AM |
9981 | + if (dinfo->di_btop > dinfo->di_bbot) { |
9982 | + dinfo->di_btop = -1; | |
9983 | + dinfo->di_bbot = -1; | |
1facf9fc | 9984 | + return; |
9985 | + } | |
9986 | + | |
5afbbe0d AM |
9987 | + hdp = au_hdentry(dinfo, dinfo->di_bbot); |
9988 | + for (; dinfo->di_bbot >= 0; dinfo->di_bbot--, hdp--) | |
9989 | + if (hdp->hd_dentry) | |
1facf9fc | 9990 | + break; |
5afbbe0d | 9991 | + AuDebugOn(dinfo->di_btop > dinfo->di_bbot || dinfo->di_bbot < 0); |
1facf9fc | 9992 | +} |
9993 | + | |
5afbbe0d | 9994 | +void au_update_dbtop(struct dentry *dentry) |
1facf9fc | 9995 | +{ |
5afbbe0d | 9996 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 9997 | + struct dentry *h_dentry; |
9998 | + | |
5afbbe0d AM |
9999 | + bbot = au_dbbot(dentry); |
10000 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { | |
1facf9fc | 10001 | + h_dentry = au_h_dptr(dentry, bindex); |
10002 | + if (!h_dentry) | |
10003 | + continue; | |
5527c038 | 10004 | + if (d_is_positive(h_dentry)) { |
5afbbe0d | 10005 | + au_set_dbtop(dentry, bindex); |
1facf9fc | 10006 | + return; |
10007 | + } | |
10008 | + au_set_h_dptr(dentry, bindex, NULL); | |
10009 | + } | |
10010 | +} | |
10011 | + | |
5afbbe0d | 10012 | +void au_update_dbbot(struct dentry *dentry) |
1facf9fc | 10013 | +{ |
5afbbe0d | 10014 | + aufs_bindex_t bindex, btop; |
1facf9fc | 10015 | + struct dentry *h_dentry; |
10016 | + | |
5afbbe0d AM |
10017 | + btop = au_dbtop(dentry); |
10018 | + for (bindex = au_dbbot(dentry); bindex >= btop; bindex--) { | |
1facf9fc | 10019 | + h_dentry = au_h_dptr(dentry, bindex); |
10020 | + if (!h_dentry) | |
10021 | + continue; | |
5527c038 | 10022 | + if (d_is_positive(h_dentry)) { |
5afbbe0d | 10023 | + au_set_dbbot(dentry, bindex); |
1facf9fc | 10024 | + return; |
10025 | + } | |
10026 | + au_set_h_dptr(dentry, bindex, NULL); | |
10027 | + } | |
10028 | +} | |
10029 | + | |
10030 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry) | |
10031 | +{ | |
5afbbe0d | 10032 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10033 | + |
5afbbe0d AM |
10034 | + bbot = au_dbbot(dentry); |
10035 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) | |
1facf9fc | 10036 | + if (au_h_dptr(dentry, bindex) == h_dentry) |
10037 | + return bindex; | |
10038 | + return -1; | |
10039 | +} | |
7f207e10 | 10040 | diff -urN /usr/share/empty/fs/aufs/dir.c linux/fs/aufs/dir.c |
eca34b5c | 10041 | --- /usr/share/empty/fs/aufs/dir.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 10042 | +++ linux/fs/aufs/dir.c 2020-01-27 10:57:18.168871450 +0100 |
eca801bf | 10043 | @@ -0,0 +1,763 @@ |
cd7a4cd9 | 10044 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 10045 | +/* |
016522bc | 10046 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 10047 | + * |
10048 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10049 | + * it under the terms of the GNU General Public License as published by | |
10050 | + * the Free Software Foundation; either version 2 of the License, or | |
10051 | + * (at your option) any later version. | |
dece6358 AM |
10052 | + * |
10053 | + * This program is distributed in the hope that it will be useful, | |
10054 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10055 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10056 | + * GNU General Public License for more details. | |
10057 | + * | |
10058 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 10059 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 10060 | + */ |
10061 | + | |
10062 | +/* | |
10063 | + * directory operations | |
10064 | + */ | |
10065 | + | |
10066 | +#include <linux/fs_stack.h> | |
eca801bf | 10067 | +#include <linux/iversion.h> |
1facf9fc | 10068 | +#include "aufs.h" |
10069 | + | |
10070 | +void au_add_nlink(struct inode *dir, struct inode *h_dir) | |
10071 | +{ | |
9dbd164d AM |
10072 | + unsigned int nlink; |
10073 | + | |
1facf9fc | 10074 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); |
10075 | + | |
9dbd164d AM |
10076 | + nlink = dir->i_nlink; |
10077 | + nlink += h_dir->i_nlink - 2; | |
1facf9fc | 10078 | + if (h_dir->i_nlink < 2) |
9dbd164d | 10079 | + nlink += 2; |
f6b6e03d | 10080 | + smp_mb(); /* for i_nlink */ |
7eafdf33 | 10081 | + /* 0 can happen in revaliding */ |
92d182d2 | 10082 | + set_nlink(dir, nlink); |
1facf9fc | 10083 | +} |
10084 | + | |
10085 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir) | |
10086 | +{ | |
9dbd164d AM |
10087 | + unsigned int nlink; |
10088 | + | |
1facf9fc | 10089 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); |
10090 | + | |
9dbd164d AM |
10091 | + nlink = dir->i_nlink; |
10092 | + nlink -= h_dir->i_nlink - 2; | |
1facf9fc | 10093 | + if (h_dir->i_nlink < 2) |
9dbd164d | 10094 | + nlink -= 2; |
f6b6e03d | 10095 | + smp_mb(); /* for i_nlink */ |
92d182d2 | 10096 | + /* nlink == 0 means the branch-fs is broken */ |
9dbd164d | 10097 | + set_nlink(dir, nlink); |
1facf9fc | 10098 | +} |
10099 | + | |
1308ab2a | 10100 | +loff_t au_dir_size(struct file *file, struct dentry *dentry) |
10101 | +{ | |
10102 | + loff_t sz; | |
5afbbe0d | 10103 | + aufs_bindex_t bindex, bbot; |
1308ab2a | 10104 | + struct file *h_file; |
10105 | + struct dentry *h_dentry; | |
10106 | + | |
10107 | + sz = 0; | |
10108 | + if (file) { | |
2000de60 | 10109 | + AuDebugOn(!d_is_dir(file->f_path.dentry)); |
1308ab2a | 10110 | + |
5afbbe0d AM |
10111 | + bbot = au_fbbot_dir(file); |
10112 | + for (bindex = au_fbtop(file); | |
10113 | + bindex <= bbot && sz < KMALLOC_MAX_SIZE; | |
1308ab2a | 10114 | + bindex++) { |
4a4d8108 | 10115 | + h_file = au_hf_dir(file, bindex); |
c06a8ce3 AM |
10116 | + if (h_file && file_inode(h_file)) |
10117 | + sz += vfsub_f_size_read(h_file); | |
1308ab2a | 10118 | + } |
10119 | + } else { | |
10120 | + AuDebugOn(!dentry); | |
2000de60 | 10121 | + AuDebugOn(!d_is_dir(dentry)); |
1308ab2a | 10122 | + |
5afbbe0d AM |
10123 | + bbot = au_dbtaildir(dentry); |
10124 | + for (bindex = au_dbtop(dentry); | |
10125 | + bindex <= bbot && sz < KMALLOC_MAX_SIZE; | |
1308ab2a | 10126 | + bindex++) { |
10127 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 JR |
10128 | + if (h_dentry && d_is_positive(h_dentry)) |
10129 | + sz += i_size_read(d_inode(h_dentry)); | |
1308ab2a | 10130 | + } |
10131 | + } | |
10132 | + if (sz < KMALLOC_MAX_SIZE) | |
10133 | + sz = roundup_pow_of_two(sz); | |
10134 | + if (sz > KMALLOC_MAX_SIZE) | |
10135 | + sz = KMALLOC_MAX_SIZE; | |
10136 | + else if (sz < NAME_MAX) { | |
10137 | + BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX); | |
10138 | + sz = AUFS_RDBLK_DEF; | |
10139 | + } | |
10140 | + return sz; | |
10141 | +} | |
10142 | + | |
b912730e AM |
10143 | +struct au_dir_ts_arg { |
10144 | + struct dentry *dentry; | |
10145 | + aufs_bindex_t brid; | |
10146 | +}; | |
10147 | + | |
10148 | +static void au_do_dir_ts(void *arg) | |
10149 | +{ | |
10150 | + struct au_dir_ts_arg *a = arg; | |
10151 | + struct au_dtime dt; | |
10152 | + struct path h_path; | |
10153 | + struct inode *dir, *h_dir; | |
10154 | + struct super_block *sb; | |
10155 | + struct au_branch *br; | |
10156 | + struct au_hinode *hdir; | |
10157 | + int err; | |
5afbbe0d | 10158 | + aufs_bindex_t btop, bindex; |
b912730e AM |
10159 | + |
10160 | + sb = a->dentry->d_sb; | |
5527c038 | 10161 | + if (d_really_is_negative(a->dentry)) |
b912730e | 10162 | + goto out; |
5527c038 | 10163 | + /* no dir->i_mutex lock */ |
b95c5147 AM |
10164 | + aufs_read_lock(a->dentry, AuLock_DW); /* noflush */ |
10165 | + | |
5527c038 | 10166 | + dir = d_inode(a->dentry); |
5afbbe0d | 10167 | + btop = au_ibtop(dir); |
b912730e | 10168 | + bindex = au_br_index(sb, a->brid); |
5afbbe0d | 10169 | + if (bindex < btop) |
b912730e AM |
10170 | + goto out_unlock; |
10171 | + | |
10172 | + br = au_sbr(sb, bindex); | |
10173 | + h_path.dentry = au_h_dptr(a->dentry, bindex); | |
10174 | + if (!h_path.dentry) | |
10175 | + goto out_unlock; | |
10176 | + h_path.mnt = au_br_mnt(br); | |
10177 | + au_dtime_store(&dt, a->dentry, &h_path); | |
10178 | + | |
5afbbe0d | 10179 | + br = au_sbr(sb, btop); |
b912730e AM |
10180 | + if (!au_br_writable(br->br_perm)) |
10181 | + goto out_unlock; | |
5afbbe0d | 10182 | + h_path.dentry = au_h_dptr(a->dentry, btop); |
b912730e AM |
10183 | + h_path.mnt = au_br_mnt(br); |
10184 | + err = vfsub_mnt_want_write(h_path.mnt); | |
10185 | + if (err) | |
10186 | + goto out_unlock; | |
5afbbe0d AM |
10187 | + hdir = au_hi(dir, btop); |
10188 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); | |
10189 | + h_dir = au_h_iptr(dir, btop); | |
b912730e | 10190 | + if (h_dir->i_nlink |
cd7a4cd9 | 10191 | + && timespec64_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) { |
b912730e AM |
10192 | + dt.dt_h_path = h_path; |
10193 | + au_dtime_revert(&dt); | |
10194 | + } | |
5afbbe0d | 10195 | + au_hn_inode_unlock(hdir); |
b912730e AM |
10196 | + vfsub_mnt_drop_write(h_path.mnt); |
10197 | + au_cpup_attr_timesizes(dir); | |
10198 | + | |
10199 | +out_unlock: | |
10200 | + aufs_read_unlock(a->dentry, AuLock_DW); | |
10201 | +out: | |
10202 | + dput(a->dentry); | |
10203 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
9f237c51 | 10204 | + au_kfree_try_rcu(arg); |
b912730e AM |
10205 | +} |
10206 | + | |
10207 | +void au_dir_ts(struct inode *dir, aufs_bindex_t bindex) | |
10208 | +{ | |
10209 | + int perm, wkq_err; | |
5afbbe0d | 10210 | + aufs_bindex_t btop; |
b912730e AM |
10211 | + struct au_dir_ts_arg *arg; |
10212 | + struct dentry *dentry; | |
10213 | + struct super_block *sb; | |
10214 | + | |
10215 | + IMustLock(dir); | |
10216 | + | |
10217 | + dentry = d_find_any_alias(dir); | |
10218 | + AuDebugOn(!dentry); | |
10219 | + sb = dentry->d_sb; | |
5afbbe0d AM |
10220 | + btop = au_ibtop(dir); |
10221 | + if (btop == bindex) { | |
b912730e AM |
10222 | + au_cpup_attr_timesizes(dir); |
10223 | + goto out; | |
10224 | + } | |
10225 | + | |
5afbbe0d | 10226 | + perm = au_sbr_perm(sb, btop); |
b912730e AM |
10227 | + if (!au_br_writable(perm)) |
10228 | + goto out; | |
10229 | + | |
10230 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
10231 | + if (!arg) | |
10232 | + goto out; | |
10233 | + | |
10234 | + arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */ | |
10235 | + arg->brid = au_sbr_id(sb, bindex); | |
10236 | + wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0); | |
10237 | + if (unlikely(wkq_err)) { | |
10238 | + pr_err("wkq %d\n", wkq_err); | |
10239 | + dput(dentry); | |
9f237c51 | 10240 | + au_kfree_try_rcu(arg); |
b912730e AM |
10241 | + } |
10242 | + | |
10243 | +out: | |
10244 | + dput(dentry); | |
10245 | +} | |
10246 | + | |
1facf9fc | 10247 | +/* ---------------------------------------------------------------------- */ |
10248 | + | |
10249 | +static int reopen_dir(struct file *file) | |
10250 | +{ | |
10251 | + int err; | |
10252 | + unsigned int flags; | |
5afbbe0d | 10253 | + aufs_bindex_t bindex, btail, btop; |
1facf9fc | 10254 | + struct dentry *dentry, *h_dentry; |
10255 | + struct file *h_file; | |
10256 | + | |
10257 | + /* open all lower dirs */ | |
2000de60 | 10258 | + dentry = file->f_path.dentry; |
5afbbe0d AM |
10259 | + btop = au_dbtop(dentry); |
10260 | + for (bindex = au_fbtop(file); bindex < btop; bindex++) | |
1facf9fc | 10261 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d | 10262 | + au_set_fbtop(file, btop); |
1facf9fc | 10263 | + |
10264 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 10265 | + for (bindex = au_fbbot_dir(file); btail < bindex; bindex--) |
1facf9fc | 10266 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d | 10267 | + au_set_fbbot_dir(file, btail); |
1facf9fc | 10268 | + |
4a4d8108 | 10269 | + flags = vfsub_file_flags(file); |
5afbbe0d | 10270 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 10271 | + h_dentry = au_h_dptr(dentry, bindex); |
10272 | + if (!h_dentry) | |
10273 | + continue; | |
4a4d8108 | 10274 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 10275 | + if (h_file) |
10276 | + continue; | |
10277 | + | |
392086de | 10278 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
1facf9fc | 10279 | + err = PTR_ERR(h_file); |
10280 | + if (IS_ERR(h_file)) | |
10281 | + goto out; /* close all? */ | |
10282 | + au_set_h_fptr(file, bindex, h_file); | |
10283 | + } | |
10284 | + au_update_figen(file); | |
10285 | + /* todo: necessary? */ | |
10286 | + /* file->f_ra = h_file->f_ra; */ | |
10287 | + err = 0; | |
10288 | + | |
4f0767ce | 10289 | +out: |
1facf9fc | 10290 | + return err; |
10291 | +} | |
10292 | + | |
b912730e | 10293 | +static int do_open_dir(struct file *file, int flags, struct file *h_file) |
1facf9fc | 10294 | +{ |
10295 | + int err; | |
10296 | + aufs_bindex_t bindex, btail; | |
10297 | + struct dentry *dentry, *h_dentry; | |
8cdd5066 | 10298 | + struct vfsmount *mnt; |
1facf9fc | 10299 | + |
1308ab2a | 10300 | + FiMustWriteLock(file); |
b912730e | 10301 | + AuDebugOn(h_file); |
1308ab2a | 10302 | + |
523b37e3 | 10303 | + err = 0; |
8cdd5066 | 10304 | + mnt = file->f_path.mnt; |
2000de60 | 10305 | + dentry = file->f_path.dentry; |
be118d29 | 10306 | + file->f_version = inode_query_iversion(d_inode(dentry)); |
5afbbe0d AM |
10307 | + bindex = au_dbtop(dentry); |
10308 | + au_set_fbtop(file, bindex); | |
1facf9fc | 10309 | + btail = au_dbtaildir(dentry); |
5afbbe0d | 10310 | + au_set_fbbot_dir(file, btail); |
1facf9fc | 10311 | + for (; !err && bindex <= btail; bindex++) { |
10312 | + h_dentry = au_h_dptr(dentry, bindex); | |
10313 | + if (!h_dentry) | |
10314 | + continue; | |
10315 | + | |
8cdd5066 JR |
10316 | + err = vfsub_test_mntns(mnt, h_dentry->d_sb); |
10317 | + if (unlikely(err)) | |
10318 | + break; | |
392086de | 10319 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
1facf9fc | 10320 | + if (IS_ERR(h_file)) { |
10321 | + err = PTR_ERR(h_file); | |
10322 | + break; | |
10323 | + } | |
10324 | + au_set_h_fptr(file, bindex, h_file); | |
10325 | + } | |
10326 | + au_update_figen(file); | |
10327 | + /* todo: necessary? */ | |
10328 | + /* file->f_ra = h_file->f_ra; */ | |
10329 | + if (!err) | |
10330 | + return 0; /* success */ | |
10331 | + | |
10332 | + /* close all */ | |
5afbbe0d | 10333 | + for (bindex = au_fbtop(file); bindex <= btail; bindex++) |
1facf9fc | 10334 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d AM |
10335 | + au_set_fbtop(file, -1); |
10336 | + au_set_fbbot_dir(file, -1); | |
4a4d8108 | 10337 | + |
1facf9fc | 10338 | + return err; |
10339 | +} | |
10340 | + | |
10341 | +static int aufs_open_dir(struct inode *inode __maybe_unused, | |
10342 | + struct file *file) | |
10343 | +{ | |
4a4d8108 AM |
10344 | + int err; |
10345 | + struct super_block *sb; | |
10346 | + struct au_fidir *fidir; | |
10347 | + | |
10348 | + err = -ENOMEM; | |
2000de60 | 10349 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 | 10350 | + si_read_lock(sb, AuLock_FLUSH); |
e49829fe | 10351 | + fidir = au_fidir_alloc(sb); |
4a4d8108 | 10352 | + if (fidir) { |
b912730e AM |
10353 | + struct au_do_open_args args = { |
10354 | + .open = do_open_dir, | |
10355 | + .fidir = fidir | |
10356 | + }; | |
10357 | + err = au_do_open(file, &args); | |
4a4d8108 | 10358 | + if (unlikely(err)) |
9f237c51 | 10359 | + au_kfree_rcu(fidir); |
4a4d8108 AM |
10360 | + } |
10361 | + si_read_unlock(sb); | |
10362 | + return err; | |
1facf9fc | 10363 | +} |
10364 | + | |
10365 | +static int aufs_release_dir(struct inode *inode __maybe_unused, | |
10366 | + struct file *file) | |
10367 | +{ | |
10368 | + struct au_vdir *vdir_cache; | |
4a4d8108 AM |
10369 | + struct au_finfo *finfo; |
10370 | + struct au_fidir *fidir; | |
f0c0a007 | 10371 | + struct au_hfile *hf; |
5afbbe0d | 10372 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10373 | + |
4a4d8108 AM |
10374 | + finfo = au_fi(file); |
10375 | + fidir = finfo->fi_hdir; | |
10376 | + if (fidir) { | |
8b6a4947 AM |
10377 | + au_hbl_del(&finfo->fi_hlist, |
10378 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
4a4d8108 AM |
10379 | + vdir_cache = fidir->fd_vdir_cache; /* lock-free */ |
10380 | + if (vdir_cache) | |
1c60b727 | 10381 | + au_vdir_free(vdir_cache); |
4a4d8108 AM |
10382 | + |
10383 | + bindex = finfo->fi_btop; | |
10384 | + if (bindex >= 0) { | |
f0c0a007 | 10385 | + hf = fidir->fd_hfile + bindex; |
4a4d8108 AM |
10386 | + /* |
10387 | + * calls fput() instead of filp_close(), | |
10388 | + * since no dnotify or lock for the lower file. | |
10389 | + */ | |
5afbbe0d | 10390 | + bbot = fidir->fd_bbot; |
f0c0a007 AM |
10391 | + for (; bindex <= bbot; bindex++, hf++) |
10392 | + if (hf->hf_file) | |
1c60b727 | 10393 | + au_hfput(hf, /*execed*/0); |
4a4d8108 | 10394 | + } |
9f237c51 | 10395 | + au_kfree_rcu(fidir); |
4a4d8108 | 10396 | + finfo->fi_hdir = NULL; |
1facf9fc | 10397 | + } |
1c60b727 | 10398 | + au_finfo_fin(file); |
1facf9fc | 10399 | + return 0; |
10400 | +} | |
10401 | + | |
10402 | +/* ---------------------------------------------------------------------- */ | |
10403 | + | |
4a4d8108 AM |
10404 | +static int au_do_flush_dir(struct file *file, fl_owner_t id) |
10405 | +{ | |
10406 | + int err; | |
5afbbe0d | 10407 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
10408 | + struct file *h_file; |
10409 | + | |
10410 | + err = 0; | |
5afbbe0d AM |
10411 | + bbot = au_fbbot_dir(file); |
10412 | + for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { | |
4a4d8108 AM |
10413 | + h_file = au_hf_dir(file, bindex); |
10414 | + if (h_file) | |
10415 | + err = vfsub_flush(h_file, id); | |
10416 | + } | |
10417 | + return err; | |
10418 | +} | |
10419 | + | |
10420 | +static int aufs_flush_dir(struct file *file, fl_owner_t id) | |
10421 | +{ | |
10422 | + return au_do_flush(file, id, au_do_flush_dir); | |
10423 | +} | |
10424 | + | |
10425 | +/* ---------------------------------------------------------------------- */ | |
10426 | + | |
1facf9fc | 10427 | +static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync) |
10428 | +{ | |
10429 | + int err; | |
5afbbe0d | 10430 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 10431 | + struct inode *inode; |
10432 | + struct super_block *sb; | |
10433 | + | |
10434 | + err = 0; | |
10435 | + sb = dentry->d_sb; | |
5527c038 | 10436 | + inode = d_inode(dentry); |
1facf9fc | 10437 | + IMustLock(inode); |
5afbbe0d AM |
10438 | + bbot = au_dbbot(dentry); |
10439 | + for (bindex = au_dbtop(dentry); !err && bindex <= bbot; bindex++) { | |
1facf9fc | 10440 | + struct path h_path; |
1facf9fc | 10441 | + |
10442 | + if (au_test_ro(sb, bindex, inode)) | |
10443 | + continue; | |
10444 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
10445 | + if (!h_path.dentry) | |
10446 | + continue; | |
1facf9fc | 10447 | + |
1facf9fc | 10448 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
53392da6 | 10449 | + err = vfsub_fsync(NULL, &h_path, datasync); |
1facf9fc | 10450 | + } |
10451 | + | |
10452 | + return err; | |
10453 | +} | |
10454 | + | |
10455 | +static int au_do_fsync_dir(struct file *file, int datasync) | |
10456 | +{ | |
10457 | + int err; | |
5afbbe0d | 10458 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 10459 | + struct file *h_file; |
10460 | + struct super_block *sb; | |
10461 | + struct inode *inode; | |
1facf9fc | 10462 | + |
521ced18 | 10463 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); |
1facf9fc | 10464 | + if (unlikely(err)) |
10465 | + goto out; | |
10466 | + | |
c06a8ce3 | 10467 | + inode = file_inode(file); |
b912730e | 10468 | + sb = inode->i_sb; |
5afbbe0d AM |
10469 | + bbot = au_fbbot_dir(file); |
10470 | + for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { | |
4a4d8108 | 10471 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 10472 | + if (!h_file || au_test_ro(sb, bindex, inode)) |
10473 | + continue; | |
10474 | + | |
53392da6 | 10475 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
1facf9fc | 10476 | + } |
10477 | + | |
4f0767ce | 10478 | +out: |
1facf9fc | 10479 | + return err; |
10480 | +} | |
10481 | + | |
10482 | +/* | |
10483 | + * @file may be NULL | |
10484 | + */ | |
1e00d052 AM |
10485 | +static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end, |
10486 | + int datasync) | |
1facf9fc | 10487 | +{ |
10488 | + int err; | |
b752ccd1 | 10489 | + struct dentry *dentry; |
5527c038 | 10490 | + struct inode *inode; |
1facf9fc | 10491 | + struct super_block *sb; |
1facf9fc | 10492 | + |
10493 | + err = 0; | |
2000de60 | 10494 | + dentry = file->f_path.dentry; |
5527c038 | 10495 | + inode = d_inode(dentry); |
febd17d6 | 10496 | + inode_lock(inode); |
1facf9fc | 10497 | + sb = dentry->d_sb; |
10498 | + si_noflush_read_lock(sb); | |
10499 | + if (file) | |
10500 | + err = au_do_fsync_dir(file, datasync); | |
10501 | + else { | |
10502 | + di_write_lock_child(dentry); | |
10503 | + err = au_do_fsync_dir_no_file(dentry, datasync); | |
10504 | + } | |
5527c038 | 10505 | + au_cpup_attr_timesizes(inode); |
1facf9fc | 10506 | + di_write_unlock(dentry); |
10507 | + if (file) | |
10508 | + fi_write_unlock(file); | |
10509 | + | |
10510 | + si_read_unlock(sb); | |
febd17d6 | 10511 | + inode_unlock(inode); |
1facf9fc | 10512 | + return err; |
10513 | +} | |
10514 | + | |
10515 | +/* ---------------------------------------------------------------------- */ | |
10516 | + | |
5afbbe0d | 10517 | +static int aufs_iterate_shared(struct file *file, struct dir_context *ctx) |
1facf9fc | 10518 | +{ |
10519 | + int err; | |
10520 | + struct dentry *dentry; | |
9dbd164d | 10521 | + struct inode *inode, *h_inode; |
1facf9fc | 10522 | + struct super_block *sb; |
10523 | + | |
062440b3 | 10524 | + AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); |
392086de | 10525 | + |
2000de60 | 10526 | + dentry = file->f_path.dentry; |
5527c038 | 10527 | + inode = d_inode(dentry); |
1facf9fc | 10528 | + IMustLock(inode); |
10529 | + | |
10530 | + sb = dentry->d_sb; | |
10531 | + si_read_lock(sb, AuLock_FLUSH); | |
521ced18 | 10532 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); |
1facf9fc | 10533 | + if (unlikely(err)) |
10534 | + goto out; | |
027c5e7a AM |
10535 | + err = au_alive_dir(dentry); |
10536 | + if (!err) | |
10537 | + err = au_vdir_init(file); | |
1facf9fc | 10538 | + di_downgrade_lock(dentry, AuLock_IR); |
10539 | + if (unlikely(err)) | |
10540 | + goto out_unlock; | |
10541 | + | |
5afbbe0d | 10542 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
b752ccd1 | 10543 | + if (!au_test_nfsd()) { |
392086de | 10544 | + err = au_vdir_fill_de(file, ctx); |
9dbd164d | 10545 | + fsstack_copy_attr_atime(inode, h_inode); |
1facf9fc | 10546 | + } else { |
10547 | + /* | |
10548 | + * nfsd filldir may call lookup_one_len(), vfs_getattr(), | |
10549 | + * encode_fh() and others. | |
10550 | + */ | |
9dbd164d | 10551 | + atomic_inc(&h_inode->i_count); |
1facf9fc | 10552 | + di_read_unlock(dentry, AuLock_IR); |
10553 | + si_read_unlock(sb); | |
392086de | 10554 | + err = au_vdir_fill_de(file, ctx); |
1facf9fc | 10555 | + fsstack_copy_attr_atime(inode, h_inode); |
10556 | + fi_write_unlock(file); | |
9dbd164d | 10557 | + iput(h_inode); |
1facf9fc | 10558 | + |
10559 | + AuTraceErr(err); | |
10560 | + return err; | |
10561 | + } | |
10562 | + | |
4f0767ce | 10563 | +out_unlock: |
1facf9fc | 10564 | + di_read_unlock(dentry, AuLock_IR); |
10565 | + fi_write_unlock(file); | |
4f0767ce | 10566 | +out: |
1facf9fc | 10567 | + si_read_unlock(sb); |
10568 | + return err; | |
10569 | +} | |
10570 | + | |
10571 | +/* ---------------------------------------------------------------------- */ | |
10572 | + | |
10573 | +#define AuTestEmpty_WHONLY 1 | |
dece6358 AM |
10574 | +#define AuTestEmpty_CALLED (1 << 1) |
10575 | +#define AuTestEmpty_SHWH (1 << 2) | |
1facf9fc | 10576 | +#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name) |
7f207e10 AM |
10577 | +#define au_fset_testempty(flags, name) \ |
10578 | + do { (flags) |= AuTestEmpty_##name; } while (0) | |
10579 | +#define au_fclr_testempty(flags, name) \ | |
10580 | + do { (flags) &= ~AuTestEmpty_##name; } while (0) | |
1facf9fc | 10581 | + |
dece6358 AM |
10582 | +#ifndef CONFIG_AUFS_SHWH |
10583 | +#undef AuTestEmpty_SHWH | |
10584 | +#define AuTestEmpty_SHWH 0 | |
10585 | +#endif | |
10586 | + | |
1facf9fc | 10587 | +struct test_empty_arg { |
392086de | 10588 | + struct dir_context ctx; |
1308ab2a | 10589 | + struct au_nhash *whlist; |
1facf9fc | 10590 | + unsigned int flags; |
10591 | + int err; | |
10592 | + aufs_bindex_t bindex; | |
10593 | +}; | |
10594 | + | |
392086de AM |
10595 | +static int test_empty_cb(struct dir_context *ctx, const char *__name, |
10596 | + int namelen, loff_t offset __maybe_unused, u64 ino, | |
dece6358 | 10597 | + unsigned int d_type) |
1facf9fc | 10598 | +{ |
392086de AM |
10599 | + struct test_empty_arg *arg = container_of(ctx, struct test_empty_arg, |
10600 | + ctx); | |
1facf9fc | 10601 | + char *name = (void *)__name; |
10602 | + | |
10603 | + arg->err = 0; | |
10604 | + au_fset_testempty(arg->flags, CALLED); | |
10605 | + /* smp_mb(); */ | |
10606 | + if (name[0] == '.' | |
10607 | + && (namelen == 1 || (name[1] == '.' && namelen == 2))) | |
10608 | + goto out; /* success */ | |
10609 | + | |
10610 | + if (namelen <= AUFS_WH_PFX_LEN | |
10611 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
10612 | + if (au_ftest_testempty(arg->flags, WHONLY) | |
1308ab2a | 10613 | + && !au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 10614 | + arg->err = -ENOTEMPTY; |
10615 | + goto out; | |
10616 | + } | |
10617 | + | |
10618 | + name += AUFS_WH_PFX_LEN; | |
10619 | + namelen -= AUFS_WH_PFX_LEN; | |
1308ab2a | 10620 | + if (!au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 10621 | + arg->err = au_nhash_append_wh |
1308ab2a | 10622 | + (arg->whlist, name, namelen, ino, d_type, arg->bindex, |
dece6358 | 10623 | + au_ftest_testempty(arg->flags, SHWH)); |
1facf9fc | 10624 | + |
4f0767ce | 10625 | +out: |
1facf9fc | 10626 | + /* smp_mb(); */ |
10627 | + AuTraceErr(arg->err); | |
10628 | + return arg->err; | |
10629 | +} | |
10630 | + | |
10631 | +static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
10632 | +{ | |
10633 | + int err; | |
10634 | + struct file *h_file; | |
acd2b654 | 10635 | + struct au_branch *br; |
1facf9fc | 10636 | + |
10637 | + h_file = au_h_open(dentry, arg->bindex, | |
10638 | + O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE, | |
392086de | 10639 | + /*file*/NULL, /*force_wr*/0); |
1facf9fc | 10640 | + err = PTR_ERR(h_file); |
10641 | + if (IS_ERR(h_file)) | |
10642 | + goto out; | |
10643 | + | |
10644 | + err = 0; | |
10645 | + if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
c06a8ce3 | 10646 | + && !file_inode(h_file)->i_nlink) |
1facf9fc | 10647 | + goto out_put; |
10648 | + | |
10649 | + do { | |
10650 | + arg->err = 0; | |
10651 | + au_fclr_testempty(arg->flags, CALLED); | |
10652 | + /* smp_mb(); */ | |
392086de | 10653 | + err = vfsub_iterate_dir(h_file, &arg->ctx); |
1facf9fc | 10654 | + if (err >= 0) |
10655 | + err = arg->err; | |
10656 | + } while (!err && au_ftest_testempty(arg->flags, CALLED)); | |
10657 | + | |
4f0767ce | 10658 | +out_put: |
1facf9fc | 10659 | + fput(h_file); |
acd2b654 AM |
10660 | + br = au_sbr(dentry->d_sb, arg->bindex); |
10661 | + au_lcnt_dec(&br->br_nfiles); | |
4f0767ce | 10662 | +out: |
1facf9fc | 10663 | + return err; |
10664 | +} | |
10665 | + | |
10666 | +struct do_test_empty_args { | |
10667 | + int *errp; | |
10668 | + struct dentry *dentry; | |
10669 | + struct test_empty_arg *arg; | |
10670 | +}; | |
10671 | + | |
10672 | +static void call_do_test_empty(void *args) | |
10673 | +{ | |
10674 | + struct do_test_empty_args *a = args; | |
10675 | + *a->errp = do_test_empty(a->dentry, a->arg); | |
10676 | +} | |
10677 | + | |
10678 | +static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
10679 | +{ | |
10680 | + int err, wkq_err; | |
10681 | + struct dentry *h_dentry; | |
10682 | + struct inode *h_inode; | |
10683 | + | |
10684 | + h_dentry = au_h_dptr(dentry, arg->bindex); | |
5527c038 | 10685 | + h_inode = d_inode(h_dentry); |
53392da6 | 10686 | + /* todo: i_mode changes anytime? */ |
be118d29 | 10687 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); |
1facf9fc | 10688 | + err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ); |
3c1bdaff | 10689 | + inode_unlock_shared(h_inode); |
1facf9fc | 10690 | + if (!err) |
10691 | + err = do_test_empty(dentry, arg); | |
10692 | + else { | |
10693 | + struct do_test_empty_args args = { | |
10694 | + .errp = &err, | |
10695 | + .dentry = dentry, | |
10696 | + .arg = arg | |
10697 | + }; | |
10698 | + unsigned int flags = arg->flags; | |
10699 | + | |
10700 | + wkq_err = au_wkq_wait(call_do_test_empty, &args); | |
10701 | + if (unlikely(wkq_err)) | |
10702 | + err = wkq_err; | |
10703 | + arg->flags = flags; | |
10704 | + } | |
10705 | + | |
10706 | + return err; | |
10707 | +} | |
10708 | + | |
10709 | +int au_test_empty_lower(struct dentry *dentry) | |
10710 | +{ | |
10711 | + int err; | |
1308ab2a | 10712 | + unsigned int rdhash; |
5afbbe0d | 10713 | + aufs_bindex_t bindex, btop, btail; |
1308ab2a | 10714 | + struct au_nhash whlist; |
392086de AM |
10715 | + struct test_empty_arg arg = { |
10716 | + .ctx = { | |
2000de60 | 10717 | + .actor = test_empty_cb |
392086de AM |
10718 | + } |
10719 | + }; | |
076b876e | 10720 | + int (*test_empty)(struct dentry *dentry, struct test_empty_arg *arg); |
1facf9fc | 10721 | + |
dece6358 AM |
10722 | + SiMustAnyLock(dentry->d_sb); |
10723 | + | |
1308ab2a | 10724 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; |
10725 | + if (!rdhash) | |
10726 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry)); | |
10727 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
dece6358 | 10728 | + if (unlikely(err)) |
1facf9fc | 10729 | + goto out; |
10730 | + | |
1facf9fc | 10731 | + arg.flags = 0; |
1308ab2a | 10732 | + arg.whlist = &whlist; |
5afbbe0d | 10733 | + btop = au_dbtop(dentry); |
dece6358 AM |
10734 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
10735 | + au_fset_testempty(arg.flags, SHWH); | |
076b876e AM |
10736 | + test_empty = do_test_empty; |
10737 | + if (au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1)) | |
10738 | + test_empty = sio_test_empty; | |
5afbbe0d | 10739 | + arg.bindex = btop; |
076b876e | 10740 | + err = test_empty(dentry, &arg); |
1facf9fc | 10741 | + if (unlikely(err)) |
10742 | + goto out_whlist; | |
10743 | + | |
10744 | + au_fset_testempty(arg.flags, WHONLY); | |
10745 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 10746 | + for (bindex = btop + 1; !err && bindex <= btail; bindex++) { |
1facf9fc | 10747 | + struct dentry *h_dentry; |
10748 | + | |
10749 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 10750 | + if (h_dentry && d_is_positive(h_dentry)) { |
1facf9fc | 10751 | + arg.bindex = bindex; |
076b876e | 10752 | + err = test_empty(dentry, &arg); |
1facf9fc | 10753 | + } |
10754 | + } | |
10755 | + | |
4f0767ce | 10756 | +out_whlist: |
1308ab2a | 10757 | + au_nhash_wh_free(&whlist); |
4f0767ce | 10758 | +out: |
1facf9fc | 10759 | + return err; |
10760 | +} | |
10761 | + | |
10762 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist) | |
10763 | +{ | |
10764 | + int err; | |
392086de AM |
10765 | + struct test_empty_arg arg = { |
10766 | + .ctx = { | |
2000de60 | 10767 | + .actor = test_empty_cb |
392086de AM |
10768 | + } |
10769 | + }; | |
1facf9fc | 10770 | + aufs_bindex_t bindex, btail; |
10771 | + | |
10772 | + err = 0; | |
1308ab2a | 10773 | + arg.whlist = whlist; |
1facf9fc | 10774 | + arg.flags = AuTestEmpty_WHONLY; |
dece6358 AM |
10775 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
10776 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 10777 | + btail = au_dbtaildir(dentry); |
5afbbe0d | 10778 | + for (bindex = au_dbtop(dentry); !err && bindex <= btail; bindex++) { |
1facf9fc | 10779 | + struct dentry *h_dentry; |
10780 | + | |
10781 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 10782 | + if (h_dentry && d_is_positive(h_dentry)) { |
1facf9fc | 10783 | + arg.bindex = bindex; |
10784 | + err = sio_test_empty(dentry, &arg); | |
10785 | + } | |
10786 | + } | |
10787 | + | |
10788 | + return err; | |
10789 | +} | |
10790 | + | |
10791 | +/* ---------------------------------------------------------------------- */ | |
10792 | + | |
10793 | +const struct file_operations aufs_dir_fop = { | |
4a4d8108 | 10794 | + .owner = THIS_MODULE, |
027c5e7a | 10795 | + .llseek = default_llseek, |
1facf9fc | 10796 | + .read = generic_read_dir, |
5afbbe0d | 10797 | + .iterate_shared = aufs_iterate_shared, |
1facf9fc | 10798 | + .unlocked_ioctl = aufs_ioctl_dir, |
b752ccd1 AM |
10799 | +#ifdef CONFIG_COMPAT |
10800 | + .compat_ioctl = aufs_compat_ioctl_dir, | |
10801 | +#endif | |
1facf9fc | 10802 | + .open = aufs_open_dir, |
10803 | + .release = aufs_release_dir, | |
4a4d8108 | 10804 | + .flush = aufs_flush_dir, |
1facf9fc | 10805 | + .fsync = aufs_fsync_dir |
10806 | +}; | |
7f207e10 | 10807 | diff -urN /usr/share/empty/fs/aufs/dir.h linux/fs/aufs/dir.h |
eca34b5c | 10808 | --- /usr/share/empty/fs/aufs/dir.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 10809 | +++ linux/fs/aufs/dir.h 2020-01-27 10:57:18.168871450 +0100 |
9f237c51 | 10810 | @@ -0,0 +1,134 @@ |
062440b3 | 10811 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 10812 | +/* |
016522bc | 10813 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 10814 | + * |
10815 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10816 | + * it under the terms of the GNU General Public License as published by | |
10817 | + * the Free Software Foundation; either version 2 of the License, or | |
10818 | + * (at your option) any later version. | |
dece6358 AM |
10819 | + * |
10820 | + * This program is distributed in the hope that it will be useful, | |
10821 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10822 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10823 | + * GNU General Public License for more details. | |
10824 | + * | |
10825 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 10826 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 10827 | + */ |
10828 | + | |
10829 | +/* | |
10830 | + * directory operations | |
10831 | + */ | |
10832 | + | |
10833 | +#ifndef __AUFS_DIR_H__ | |
10834 | +#define __AUFS_DIR_H__ | |
10835 | + | |
10836 | +#ifdef __KERNEL__ | |
10837 | + | |
10838 | +#include <linux/fs.h> | |
1facf9fc | 10839 | + |
10840 | +/* ---------------------------------------------------------------------- */ | |
10841 | + | |
10842 | +/* need to be faster and smaller */ | |
10843 | + | |
10844 | +struct au_nhash { | |
dece6358 AM |
10845 | + unsigned int nh_num; |
10846 | + struct hlist_head *nh_head; | |
1facf9fc | 10847 | +}; |
10848 | + | |
10849 | +struct au_vdir_destr { | |
10850 | + unsigned char len; | |
10851 | + unsigned char name[0]; | |
10852 | +} __packed; | |
10853 | + | |
10854 | +struct au_vdir_dehstr { | |
10855 | + struct hlist_node hash; | |
1c60b727 | 10856 | + struct au_vdir_destr *str; |
9f237c51 | 10857 | + struct rcu_head rcu; |
4a4d8108 | 10858 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 10859 | + |
10860 | +struct au_vdir_de { | |
10861 | + ino_t de_ino; | |
10862 | + unsigned char de_type; | |
10863 | + /* caution: packed */ | |
10864 | + struct au_vdir_destr de_str; | |
10865 | +} __packed; | |
10866 | + | |
10867 | +struct au_vdir_wh { | |
10868 | + struct hlist_node wh_hash; | |
dece6358 AM |
10869 | +#ifdef CONFIG_AUFS_SHWH |
10870 | + ino_t wh_ino; | |
1facf9fc | 10871 | + aufs_bindex_t wh_bindex; |
dece6358 AM |
10872 | + unsigned char wh_type; |
10873 | +#else | |
10874 | + aufs_bindex_t wh_bindex; | |
10875 | +#endif | |
10876 | + /* caution: packed */ | |
1facf9fc | 10877 | + struct au_vdir_destr wh_str; |
10878 | +} __packed; | |
10879 | + | |
10880 | +union au_vdir_deblk_p { | |
10881 | + unsigned char *deblk; | |
10882 | + struct au_vdir_de *de; | |
10883 | +}; | |
10884 | + | |
10885 | +struct au_vdir { | |
10886 | + unsigned char **vd_deblk; | |
10887 | + unsigned long vd_nblk; | |
1facf9fc | 10888 | + struct { |
10889 | + unsigned long ul; | |
10890 | + union au_vdir_deblk_p p; | |
10891 | + } vd_last; | |
10892 | + | |
be118d29 | 10893 | + u64 vd_version; |
dece6358 | 10894 | + unsigned int vd_deblk_sz; |
9f237c51 AM |
10895 | + unsigned long vd_jiffy; |
10896 | + struct rcu_head rcu; | |
4a4d8108 | 10897 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 10898 | + |
10899 | +/* ---------------------------------------------------------------------- */ | |
10900 | + | |
10901 | +/* dir.c */ | |
10902 | +extern const struct file_operations aufs_dir_fop; | |
10903 | +void au_add_nlink(struct inode *dir, struct inode *h_dir); | |
10904 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir); | |
1308ab2a | 10905 | +loff_t au_dir_size(struct file *file, struct dentry *dentry); |
b912730e | 10906 | +void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc); |
1facf9fc | 10907 | +int au_test_empty_lower(struct dentry *dentry); |
10908 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist); | |
10909 | + | |
10910 | +/* vdir.c */ | |
1308ab2a | 10911 | +unsigned int au_rdhash_est(loff_t sz); |
dece6358 AM |
10912 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp); |
10913 | +void au_nhash_wh_free(struct au_nhash *whlist); | |
1facf9fc | 10914 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, |
10915 | + int limit); | |
dece6358 AM |
10916 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen); |
10917 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
10918 | + unsigned int d_type, aufs_bindex_t bindex, | |
10919 | + unsigned char shwh); | |
1c60b727 | 10920 | +void au_vdir_free(struct au_vdir *vdir); |
1facf9fc | 10921 | +int au_vdir_init(struct file *file); |
392086de | 10922 | +int au_vdir_fill_de(struct file *file, struct dir_context *ctx); |
1facf9fc | 10923 | + |
10924 | +/* ioctl.c */ | |
10925 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg); | |
10926 | + | |
1308ab2a | 10927 | +#ifdef CONFIG_AUFS_RDU |
10928 | +/* rdu.c */ | |
10929 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
10930 | +#ifdef CONFIG_COMPAT |
10931 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
10932 | + unsigned long arg); | |
10933 | +#endif | |
1308ab2a | 10934 | +#else |
c1595e42 JR |
10935 | +AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file, |
10936 | + unsigned int cmd, unsigned long arg) | |
b752ccd1 | 10937 | +#ifdef CONFIG_COMPAT |
c1595e42 JR |
10938 | +AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file, |
10939 | + unsigned int cmd, unsigned long arg) | |
b752ccd1 | 10940 | +#endif |
1308ab2a | 10941 | +#endif |
10942 | + | |
1facf9fc | 10943 | +#endif /* __KERNEL__ */ |
10944 | +#endif /* __AUFS_DIR_H__ */ | |
8b6a4947 | 10945 | diff -urN /usr/share/empty/fs/aufs/dirren.c linux/fs/aufs/dirren.c |
eca34b5c | 10946 | --- /usr/share/empty/fs/aufs/dirren.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 10947 | +++ linux/fs/aufs/dirren.c 2020-01-27 10:57:18.168871450 +0100 |
062440b3 | 10948 | @@ -0,0 +1,1316 @@ |
cd7a4cd9 | 10949 | +// SPDX-License-Identifier: GPL-2.0 |
8b6a4947 | 10950 | +/* |
016522bc | 10951 | + * Copyright (C) 2017-2020 Junjiro R. Okajima |
8b6a4947 AM |
10952 | + * |
10953 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10954 | + * it under the terms of the GNU General Public License as published by | |
10955 | + * the Free Software Foundation; either version 2 of the License, or | |
10956 | + * (at your option) any later version. | |
10957 | + * | |
10958 | + * This program is distributed in the hope that it will be useful, | |
10959 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10960 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10961 | + * GNU General Public License for more details. | |
10962 | + * | |
10963 | + * You should have received a copy of the GNU General Public License | |
10964 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
10965 | + */ | |
10966 | + | |
10967 | +/* | |
acd2b654 | 10968 | + * special handling in renaming a directory |
8b6a4947 AM |
10969 | + * in order to support looking-up the before-renamed name on the lower readonly |
10970 | + * branches | |
10971 | + */ | |
10972 | + | |
10973 | +#include <linux/byteorder/generic.h> | |
10974 | +#include "aufs.h" | |
10975 | + | |
10976 | +static void au_dr_hino_del(struct au_dr_br *dr, struct au_dr_hino *ent) | |
10977 | +{ | |
10978 | + int idx; | |
10979 | + | |
10980 | + idx = au_dr_ihash(ent->dr_h_ino); | |
10981 | + au_hbl_del(&ent->dr_hnode, dr->dr_h_ino + idx); | |
10982 | +} | |
10983 | + | |
10984 | +static int au_dr_hino_test_empty(struct au_dr_br *dr) | |
10985 | +{ | |
10986 | + int ret, i; | |
10987 | + struct hlist_bl_head *hbl; | |
10988 | + | |
10989 | + ret = 1; | |
10990 | + for (i = 0; ret && i < AuDirren_NHASH; i++) { | |
10991 | + hbl = dr->dr_h_ino + i; | |
10992 | + hlist_bl_lock(hbl); | |
10993 | + ret &= hlist_bl_empty(hbl); | |
10994 | + hlist_bl_unlock(hbl); | |
10995 | + } | |
10996 | + | |
10997 | + return ret; | |
10998 | +} | |
10999 | + | |
11000 | +static struct au_dr_hino *au_dr_hino_find(struct au_dr_br *dr, ino_t ino) | |
11001 | +{ | |
11002 | + struct au_dr_hino *found, *ent; | |
11003 | + struct hlist_bl_head *hbl; | |
11004 | + struct hlist_bl_node *pos; | |
11005 | + int idx; | |
11006 | + | |
11007 | + found = NULL; | |
11008 | + idx = au_dr_ihash(ino); | |
11009 | + hbl = dr->dr_h_ino + idx; | |
11010 | + hlist_bl_lock(hbl); | |
11011 | + hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) | |
11012 | + if (ent->dr_h_ino == ino) { | |
11013 | + found = ent; | |
11014 | + break; | |
11015 | + } | |
11016 | + hlist_bl_unlock(hbl); | |
11017 | + | |
11018 | + return found; | |
11019 | +} | |
11020 | + | |
11021 | +int au_dr_hino_test_add(struct au_dr_br *dr, ino_t ino, | |
11022 | + struct au_dr_hino *add_ent) | |
11023 | +{ | |
11024 | + int found, idx; | |
11025 | + struct hlist_bl_head *hbl; | |
11026 | + struct hlist_bl_node *pos; | |
11027 | + struct au_dr_hino *ent; | |
11028 | + | |
11029 | + found = 0; | |
11030 | + idx = au_dr_ihash(ino); | |
11031 | + hbl = dr->dr_h_ino + idx; | |
43982f53 | 11032 | +#if 0 /* debug print */ |
8b6a4947 AM |
11033 | + { |
11034 | + struct hlist_bl_node *tmp; | |
11035 | + | |
11036 | + hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) | |
11037 | + AuDbg("hi%llu\n", (unsigned long long)ent->dr_h_ino); | |
11038 | + } | |
11039 | +#endif | |
11040 | + hlist_bl_lock(hbl); | |
11041 | + hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) | |
11042 | + if (ent->dr_h_ino == ino) { | |
11043 | + found = 1; | |
11044 | + break; | |
11045 | + } | |
11046 | + if (!found && add_ent) | |
11047 | + hlist_bl_add_head(&add_ent->dr_hnode, hbl); | |
11048 | + hlist_bl_unlock(hbl); | |
11049 | + | |
11050 | + if (!found && add_ent) | |
11051 | + AuDbg("i%llu added\n", (unsigned long long)add_ent->dr_h_ino); | |
11052 | + | |
11053 | + return found; | |
11054 | +} | |
11055 | + | |
11056 | +void au_dr_hino_free(struct au_dr_br *dr) | |
11057 | +{ | |
11058 | + int i; | |
11059 | + struct hlist_bl_head *hbl; | |
11060 | + struct hlist_bl_node *pos, *tmp; | |
11061 | + struct au_dr_hino *ent; | |
11062 | + | |
11063 | + /* SiMustWriteLock(sb); */ | |
11064 | + | |
11065 | + for (i = 0; i < AuDirren_NHASH; i++) { | |
11066 | + hbl = dr->dr_h_ino + i; | |
11067 | + /* no spinlock since sbinfo must be write-locked */ | |
11068 | + hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) | |
9f237c51 | 11069 | + au_kfree_rcu(ent); |
8b6a4947 AM |
11070 | + INIT_HLIST_BL_HEAD(hbl); |
11071 | + } | |
11072 | +} | |
11073 | + | |
11074 | +/* returns the number of inodes or an error */ | |
11075 | +static int au_dr_hino_store(struct super_block *sb, struct au_branch *br, | |
11076 | + struct file *hinofile) | |
11077 | +{ | |
11078 | + int err, i; | |
11079 | + ssize_t ssz; | |
11080 | + loff_t pos, oldsize; | |
11081 | + __be64 u64; | |
11082 | + struct inode *hinoinode; | |
11083 | + struct hlist_bl_head *hbl; | |
11084 | + struct hlist_bl_node *n1, *n2; | |
11085 | + struct au_dr_hino *ent; | |
11086 | + | |
11087 | + SiMustWriteLock(sb); | |
11088 | + AuDebugOn(!au_br_writable(br->br_perm)); | |
11089 | + | |
11090 | + hinoinode = file_inode(hinofile); | |
11091 | + oldsize = i_size_read(hinoinode); | |
11092 | + | |
11093 | + err = 0; | |
11094 | + pos = 0; | |
11095 | + hbl = br->br_dirren.dr_h_ino; | |
11096 | + for (i = 0; !err && i < AuDirren_NHASH; i++, hbl++) { | |
11097 | + /* no bit-lock since sbinfo must be write-locked */ | |
11098 | + hlist_bl_for_each_entry_safe(ent, n1, n2, hbl, dr_hnode) { | |
11099 | + AuDbg("hi%llu, %pD2\n", | |
11100 | + (unsigned long long)ent->dr_h_ino, hinofile); | |
11101 | + u64 = cpu_to_be64(ent->dr_h_ino); | |
11102 | + ssz = vfsub_write_k(hinofile, &u64, sizeof(u64), &pos); | |
11103 | + if (ssz == sizeof(u64)) | |
11104 | + continue; | |
11105 | + | |
11106 | + /* write error */ | |
11107 | + pr_err("ssz %zd, %pD2\n", ssz, hinofile); | |
11108 | + err = -ENOSPC; | |
11109 | + if (ssz < 0) | |
11110 | + err = ssz; | |
11111 | + break; | |
11112 | + } | |
11113 | + } | |
11114 | + /* regardless the error */ | |
11115 | + if (pos < oldsize) { | |
11116 | + err = vfsub_trunc(&hinofile->f_path, pos, /*attr*/0, hinofile); | |
11117 | + AuTraceErr(err); | |
11118 | + } | |
11119 | + | |
11120 | + AuTraceErr(err); | |
11121 | + return err; | |
11122 | +} | |
11123 | + | |
11124 | +static int au_dr_hino_load(struct au_dr_br *dr, struct file *hinofile) | |
11125 | +{ | |
11126 | + int err, hidx; | |
11127 | + ssize_t ssz; | |
11128 | + size_t sz, n; | |
11129 | + loff_t pos; | |
11130 | + uint64_t u64; | |
11131 | + struct au_dr_hino *ent; | |
11132 | + struct inode *hinoinode; | |
11133 | + struct hlist_bl_head *hbl; | |
11134 | + | |
11135 | + err = 0; | |
11136 | + pos = 0; | |
11137 | + hbl = dr->dr_h_ino; | |
11138 | + hinoinode = file_inode(hinofile); | |
11139 | + sz = i_size_read(hinoinode); | |
11140 | + AuDebugOn(sz % sizeof(u64)); | |
11141 | + n = sz / sizeof(u64); | |
11142 | + while (n--) { | |
11143 | + ssz = vfsub_read_k(hinofile, &u64, sizeof(u64), &pos); | |
11144 | + if (unlikely(ssz != sizeof(u64))) { | |
11145 | + pr_err("ssz %zd, %pD2\n", ssz, hinofile); | |
11146 | + err = -EINVAL; | |
11147 | + if (ssz < 0) | |
11148 | + err = ssz; | |
11149 | + goto out_free; | |
11150 | + } | |
11151 | + | |
11152 | + ent = kmalloc(sizeof(*ent), GFP_NOFS); | |
11153 | + if (!ent) { | |
11154 | + err = -ENOMEM; | |
11155 | + AuTraceErr(err); | |
11156 | + goto out_free; | |
11157 | + } | |
11158 | + ent->dr_h_ino = be64_to_cpu((__force __be64)u64); | |
11159 | + AuDbg("hi%llu, %pD2\n", | |
11160 | + (unsigned long long)ent->dr_h_ino, hinofile); | |
11161 | + hidx = au_dr_ihash(ent->dr_h_ino); | |
11162 | + au_hbl_add(&ent->dr_hnode, hbl + hidx); | |
11163 | + } | |
11164 | + goto out; /* success */ | |
11165 | + | |
11166 | +out_free: | |
11167 | + au_dr_hino_free(dr); | |
11168 | +out: | |
11169 | + AuTraceErr(err); | |
11170 | + return err; | |
11171 | +} | |
11172 | + | |
11173 | +/* | |
11174 | + * @bindex/@br is a switch to distinguish whether suspending hnotify or not. | |
11175 | + * @path is a switch to distinguish load and store. | |
11176 | + */ | |
11177 | +static int au_dr_hino(struct super_block *sb, aufs_bindex_t bindex, | |
11178 | + struct au_branch *br, const struct path *path) | |
11179 | +{ | |
11180 | + int err, flags; | |
11181 | + unsigned char load, suspend; | |
11182 | + struct file *hinofile; | |
11183 | + struct au_hinode *hdir; | |
11184 | + struct inode *dir, *delegated; | |
11185 | + struct path hinopath; | |
11186 | + struct qstr hinoname = QSTR_INIT(AUFS_WH_DR_BRHINO, | |
11187 | + sizeof(AUFS_WH_DR_BRHINO) - 1); | |
11188 | + | |
11189 | + AuDebugOn(bindex < 0 && !br); | |
11190 | + AuDebugOn(bindex >= 0 && br); | |
11191 | + | |
11192 | + err = -EINVAL; | |
11193 | + suspend = !br; | |
11194 | + if (suspend) | |
11195 | + br = au_sbr(sb, bindex); | |
11196 | + load = !!path; | |
11197 | + if (!load) { | |
11198 | + path = &br->br_path; | |
11199 | + AuDebugOn(!au_br_writable(br->br_perm)); | |
11200 | + if (unlikely(!au_br_writable(br->br_perm))) | |
11201 | + goto out; | |
11202 | + } | |
11203 | + | |
11204 | + hdir = NULL; | |
11205 | + if (suspend) { | |
11206 | + dir = d_inode(sb->s_root); | |
11207 | + hdir = au_hinode(au_ii(dir), bindex); | |
11208 | + dir = hdir->hi_inode; | |
11209 | + au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); | |
11210 | + } else { | |
11211 | + dir = d_inode(path->dentry); | |
11212 | + inode_lock_nested(dir, AuLsc_I_CHILD); | |
11213 | + } | |
11214 | + hinopath.dentry = vfsub_lkup_one(&hinoname, path->dentry); | |
11215 | + err = PTR_ERR(hinopath.dentry); | |
11216 | + if (IS_ERR(hinopath.dentry)) | |
11217 | + goto out_unlock; | |
11218 | + | |
11219 | + err = 0; | |
11220 | + flags = O_RDONLY; | |
11221 | + if (load) { | |
11222 | + if (d_is_negative(hinopath.dentry)) | |
11223 | + goto out_dput; /* success */ | |
11224 | + } else { | |
11225 | + if (au_dr_hino_test_empty(&br->br_dirren)) { | |
11226 | + if (d_is_positive(hinopath.dentry)) { | |
11227 | + delegated = NULL; | |
11228 | + err = vfsub_unlink(dir, &hinopath, &delegated, | |
11229 | + /*force*/0); | |
11230 | + AuTraceErr(err); | |
11231 | + if (unlikely(err)) | |
11232 | + pr_err("ignored err %d, %pd2\n", | |
11233 | + err, hinopath.dentry); | |
11234 | + if (unlikely(err == -EWOULDBLOCK)) | |
11235 | + iput(delegated); | |
11236 | + err = 0; | |
11237 | + } | |
11238 | + goto out_dput; | |
11239 | + } else if (!d_is_positive(hinopath.dentry)) { | |
11240 | + err = vfsub_create(dir, &hinopath, 0600, | |
11241 | + /*want_excl*/false); | |
11242 | + AuTraceErr(err); | |
11243 | + if (unlikely(err)) | |
11244 | + goto out_dput; | |
11245 | + } | |
11246 | + flags = O_WRONLY; | |
11247 | + } | |
11248 | + hinopath.mnt = path->mnt; | |
11249 | + hinofile = vfsub_dentry_open(&hinopath, flags); | |
11250 | + if (suspend) | |
11251 | + au_hn_inode_unlock(hdir); | |
11252 | + else | |
11253 | + inode_unlock(dir); | |
11254 | + dput(hinopath.dentry); | |
11255 | + AuTraceErrPtr(hinofile); | |
11256 | + if (IS_ERR(hinofile)) { | |
11257 | + err = PTR_ERR(hinofile); | |
11258 | + goto out; | |
11259 | + } | |
11260 | + | |
11261 | + if (load) | |
11262 | + err = au_dr_hino_load(&br->br_dirren, hinofile); | |
11263 | + else | |
11264 | + err = au_dr_hino_store(sb, br, hinofile); | |
11265 | + fput(hinofile); | |
11266 | + goto out; | |
11267 | + | |
11268 | +out_dput: | |
11269 | + dput(hinopath.dentry); | |
11270 | +out_unlock: | |
11271 | + if (suspend) | |
11272 | + au_hn_inode_unlock(hdir); | |
11273 | + else | |
11274 | + inode_unlock(dir); | |
11275 | +out: | |
11276 | + AuTraceErr(err); | |
11277 | + return err; | |
11278 | +} | |
11279 | + | |
11280 | +/* ---------------------------------------------------------------------- */ | |
11281 | + | |
11282 | +static int au_dr_brid_init(struct au_dr_brid *brid, const struct path *path) | |
11283 | +{ | |
11284 | + int err; | |
11285 | + struct kstatfs kstfs; | |
11286 | + dev_t dev; | |
11287 | + struct dentry *dentry; | |
11288 | + struct super_block *sb; | |
11289 | + | |
11290 | + err = vfs_statfs((void *)path, &kstfs); | |
11291 | + AuTraceErr(err); | |
11292 | + if (unlikely(err)) | |
11293 | + goto out; | |
11294 | + | |
11295 | + /* todo: support for UUID */ | |
11296 | + | |
11297 | + if (kstfs.f_fsid.val[0] || kstfs.f_fsid.val[1]) { | |
11298 | + brid->type = AuBrid_FSID; | |
11299 | + brid->fsid = kstfs.f_fsid; | |
11300 | + } else { | |
11301 | + dentry = path->dentry; | |
11302 | + sb = dentry->d_sb; | |
11303 | + dev = sb->s_dev; | |
11304 | + if (dev) { | |
11305 | + brid->type = AuBrid_DEV; | |
11306 | + brid->dev = dev; | |
11307 | + } | |
11308 | + } | |
11309 | + | |
11310 | +out: | |
11311 | + return err; | |
11312 | +} | |
11313 | + | |
11314 | +int au_dr_br_init(struct super_block *sb, struct au_branch *br, | |
11315 | + const struct path *path) | |
11316 | +{ | |
11317 | + int err, i; | |
11318 | + struct au_dr_br *dr; | |
11319 | + struct hlist_bl_head *hbl; | |
11320 | + | |
11321 | + dr = &br->br_dirren; | |
11322 | + hbl = dr->dr_h_ino; | |
11323 | + for (i = 0; i < AuDirren_NHASH; i++, hbl++) | |
11324 | + INIT_HLIST_BL_HEAD(hbl); | |
11325 | + | |
11326 | + err = au_dr_brid_init(&dr->dr_brid, path); | |
11327 | + if (unlikely(err)) | |
11328 | + goto out; | |
11329 | + | |
11330 | + if (au_opt_test(au_mntflags(sb), DIRREN)) | |
11331 | + err = au_dr_hino(sb, /*bindex*/-1, br, path); | |
11332 | + | |
11333 | +out: | |
11334 | + AuTraceErr(err); | |
11335 | + return err; | |
11336 | +} | |
11337 | + | |
11338 | +int au_dr_br_fin(struct super_block *sb, struct au_branch *br) | |
11339 | +{ | |
11340 | + int err; | |
11341 | + | |
11342 | + err = 0; | |
11343 | + if (au_br_writable(br->br_perm)) | |
11344 | + err = au_dr_hino(sb, /*bindex*/-1, br, /*path*/NULL); | |
11345 | + if (!err) | |
11346 | + au_dr_hino_free(&br->br_dirren); | |
11347 | + | |
11348 | + return err; | |
11349 | +} | |
11350 | + | |
11351 | +/* ---------------------------------------------------------------------- */ | |
11352 | + | |
11353 | +static int au_brid_str(struct au_dr_brid *brid, struct inode *h_inode, | |
11354 | + char *buf, size_t sz) | |
11355 | +{ | |
11356 | + int err; | |
11357 | + unsigned int major, minor; | |
11358 | + char *p; | |
11359 | + | |
11360 | + p = buf; | |
11361 | + err = snprintf(p, sz, "%d_", brid->type); | |
11362 | + AuDebugOn(err > sz); | |
11363 | + p += err; | |
11364 | + sz -= err; | |
11365 | + switch (brid->type) { | |
11366 | + case AuBrid_Unset: | |
11367 | + return -EINVAL; | |
11368 | + case AuBrid_UUID: | |
11369 | + err = snprintf(p, sz, "%pU", brid->uuid.b); | |
11370 | + break; | |
11371 | + case AuBrid_FSID: | |
11372 | + err = snprintf(p, sz, "%08x-%08x", | |
11373 | + brid->fsid.val[0], brid->fsid.val[1]); | |
11374 | + break; | |
11375 | + case AuBrid_DEV: | |
11376 | + major = MAJOR(brid->dev); | |
11377 | + minor = MINOR(brid->dev); | |
11378 | + if (major <= 0xff && minor <= 0xff) | |
11379 | + err = snprintf(p, sz, "%02x%02x", major, minor); | |
11380 | + else | |
11381 | + err = snprintf(p, sz, "%03x:%05x", major, minor); | |
11382 | + break; | |
11383 | + } | |
11384 | + AuDebugOn(err > sz); | |
11385 | + p += err; | |
11386 | + sz -= err; | |
11387 | + err = snprintf(p, sz, "_%llu", (unsigned long long)h_inode->i_ino); | |
11388 | + AuDebugOn(err > sz); | |
11389 | + p += err; | |
11390 | + sz -= err; | |
11391 | + | |
11392 | + return p - buf; | |
11393 | +} | |
11394 | + | |
11395 | +static int au_drinfo_name(struct au_branch *br, char *name, int len) | |
11396 | +{ | |
11397 | + int rlen; | |
11398 | + struct dentry *br_dentry; | |
11399 | + struct inode *br_inode; | |
11400 | + | |
11401 | + br_dentry = au_br_dentry(br); | |
11402 | + br_inode = d_inode(br_dentry); | |
11403 | + rlen = au_brid_str(&br->br_dirren.dr_brid, br_inode, name, len); | |
11404 | + AuDebugOn(rlen >= AUFS_DIRREN_ENV_VAL_SZ); | |
11405 | + AuDebugOn(rlen > len); | |
11406 | + | |
11407 | + return rlen; | |
11408 | +} | |
11409 | + | |
11410 | +/* ---------------------------------------------------------------------- */ | |
11411 | + | |
11412 | +/* | |
11413 | + * from the given @h_dentry, construct drinfo at @*fdata. | |
11414 | + * when the size of @*fdata is not enough, reallocate and return new @fdata and | |
11415 | + * @allocated. | |
11416 | + */ | |
11417 | +static int au_drinfo_construct(struct au_drinfo_fdata **fdata, | |
11418 | + struct dentry *h_dentry, | |
11419 | + unsigned char *allocated) | |
11420 | +{ | |
11421 | + int err, v; | |
11422 | + struct au_drinfo_fdata *f, *p; | |
11423 | + struct au_drinfo *drinfo; | |
11424 | + struct inode *h_inode; | |
11425 | + struct qstr *qname; | |
11426 | + | |
11427 | + err = 0; | |
11428 | + f = *fdata; | |
11429 | + h_inode = d_inode(h_dentry); | |
11430 | + qname = &h_dentry->d_name; | |
11431 | + drinfo = &f->drinfo; | |
11432 | + drinfo->ino = (__force uint64_t)cpu_to_be64(h_inode->i_ino); | |
11433 | + drinfo->oldnamelen = qname->len; | |
11434 | + if (*allocated < sizeof(*f) + qname->len) { | |
11435 | + v = roundup_pow_of_two(*allocated + qname->len); | |
11436 | + p = au_krealloc(f, v, GFP_NOFS, /*may_shrink*/0); | |
11437 | + if (unlikely(!p)) { | |
11438 | + err = -ENOMEM; | |
11439 | + AuTraceErr(err); | |
11440 | + goto out; | |
11441 | + } | |
11442 | + f = p; | |
11443 | + *fdata = f; | |
11444 | + *allocated = v; | |
11445 | + drinfo = &f->drinfo; | |
11446 | + } | |
11447 | + memcpy(drinfo->oldname, qname->name, qname->len); | |
11448 | + AuDbg("i%llu, %.*s\n", | |
11449 | + be64_to_cpu((__force __be64)drinfo->ino), drinfo->oldnamelen, | |
11450 | + drinfo->oldname); | |
11451 | + | |
11452 | +out: | |
11453 | + AuTraceErr(err); | |
11454 | + return err; | |
11455 | +} | |
11456 | + | |
11457 | +/* callers have to free the return value */ | |
11458 | +static struct au_drinfo *au_drinfo_read_k(struct file *file, ino_t h_ino) | |
11459 | +{ | |
11460 | + struct au_drinfo *ret, *drinfo; | |
11461 | + struct au_drinfo_fdata fdata; | |
11462 | + int len; | |
11463 | + loff_t pos; | |
11464 | + ssize_t ssz; | |
11465 | + | |
11466 | + ret = ERR_PTR(-EIO); | |
11467 | + pos = 0; | |
11468 | + ssz = vfsub_read_k(file, &fdata, sizeof(fdata), &pos); | |
11469 | + if (unlikely(ssz != sizeof(fdata))) { | |
11470 | + AuIOErr("ssz %zd, %u, %pD2\n", | |
11471 | + ssz, (unsigned int)sizeof(fdata), file); | |
11472 | + goto out; | |
11473 | + } | |
11474 | + | |
11475 | + fdata.magic = ntohl((__force __be32)fdata.magic); | |
11476 | + switch (fdata.magic) { | |
11477 | + case AUFS_DRINFO_MAGIC_V1: | |
11478 | + break; | |
11479 | + default: | |
11480 | + AuIOErr("magic-num 0x%x, 0x%x, %pD2\n", | |
11481 | + fdata.magic, AUFS_DRINFO_MAGIC_V1, file); | |
11482 | + goto out; | |
11483 | + } | |
11484 | + | |
11485 | + drinfo = &fdata.drinfo; | |
11486 | + len = drinfo->oldnamelen; | |
11487 | + if (!len) { | |
11488 | + AuIOErr("broken drinfo %pD2\n", file); | |
11489 | + goto out; | |
11490 | + } | |
11491 | + | |
11492 | + ret = NULL; | |
11493 | + drinfo->ino = be64_to_cpu((__force __be64)drinfo->ino); | |
11494 | + if (unlikely(h_ino && drinfo->ino != h_ino)) { | |
11495 | + AuDbg("ignored i%llu, i%llu, %pD2\n", | |
11496 | + (unsigned long long)drinfo->ino, | |
11497 | + (unsigned long long)h_ino, file); | |
11498 | + goto out; /* success */ | |
11499 | + } | |
11500 | + | |
11501 | + ret = kmalloc(sizeof(*ret) + len, GFP_NOFS); | |
11502 | + if (unlikely(!ret)) { | |
11503 | + ret = ERR_PTR(-ENOMEM); | |
11504 | + AuTraceErrPtr(ret); | |
11505 | + goto out; | |
11506 | + } | |
11507 | + | |
11508 | + *ret = *drinfo; | |
11509 | + ssz = vfsub_read_k(file, (void *)ret->oldname, len, &pos); | |
11510 | + if (unlikely(ssz != len)) { | |
9f237c51 | 11511 | + au_kfree_rcu(ret); |
8b6a4947 AM |
11512 | + ret = ERR_PTR(-EIO); |
11513 | + AuIOErr("ssz %zd, %u, %pD2\n", ssz, len, file); | |
11514 | + goto out; | |
11515 | + } | |
11516 | + | |
11517 | + AuDbg("oldname %.*s\n", ret->oldnamelen, ret->oldname); | |
11518 | + | |
11519 | +out: | |
11520 | + return ret; | |
11521 | +} | |
11522 | + | |
11523 | +/* ---------------------------------------------------------------------- */ | |
11524 | + | |
11525 | +/* in order to be revertible */ | |
11526 | +struct au_drinfo_rev_elm { | |
11527 | + int created; | |
11528 | + struct dentry *info_dentry; | |
11529 | + struct au_drinfo *info_last; | |
11530 | +}; | |
11531 | + | |
11532 | +struct au_drinfo_rev { | |
11533 | + unsigned char already; | |
11534 | + aufs_bindex_t nelm; | |
11535 | + struct au_drinfo_rev_elm elm[0]; | |
11536 | +}; | |
11537 | + | |
11538 | +/* todo: isn't it too large? */ | |
11539 | +struct au_drinfo_store { | |
11540 | + struct path h_ppath; | |
11541 | + struct dentry *h_dentry; | |
11542 | + struct au_drinfo_fdata *fdata; | |
11543 | + char *infoname; /* inside of whname, just after PFX */ | |
11544 | + char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ]; | |
11545 | + aufs_bindex_t btgt, btail; | |
11546 | + unsigned char no_sio, | |
11547 | + allocated, /* current size of *fdata */ | |
11548 | + infonamelen, /* room size for p */ | |
acd2b654 | 11549 | + whnamelen, /* length of the generated name */ |
8b6a4947 AM |
11550 | + renameback; /* renamed back */ |
11551 | +}; | |
11552 | + | |
11553 | +/* on rename(2) error, the caller should revert it using @elm */ | |
11554 | +static int au_drinfo_do_store(struct au_drinfo_store *w, | |
11555 | + struct au_drinfo_rev_elm *elm) | |
11556 | +{ | |
11557 | + int err, len; | |
11558 | + ssize_t ssz; | |
11559 | + loff_t pos; | |
11560 | + struct path infopath = { | |
11561 | + .mnt = w->h_ppath.mnt | |
11562 | + }; | |
11563 | + struct inode *h_dir, *h_inode, *delegated; | |
11564 | + struct file *infofile; | |
11565 | + struct qstr *qname; | |
11566 | + | |
11567 | + AuDebugOn(elm | |
11568 | + && memcmp(elm, page_address(ZERO_PAGE(0)), sizeof(*elm))); | |
11569 | + | |
11570 | + infopath.dentry = vfsub_lookup_one_len(w->whname, w->h_ppath.dentry, | |
11571 | + w->whnamelen); | |
11572 | + AuTraceErrPtr(infopath.dentry); | |
11573 | + if (IS_ERR(infopath.dentry)) { | |
11574 | + err = PTR_ERR(infopath.dentry); | |
11575 | + goto out; | |
11576 | + } | |
11577 | + | |
11578 | + err = 0; | |
11579 | + h_dir = d_inode(w->h_ppath.dentry); | |
11580 | + if (elm && d_is_negative(infopath.dentry)) { | |
11581 | + err = vfsub_create(h_dir, &infopath, 0600, /*want_excl*/true); | |
11582 | + AuTraceErr(err); | |
11583 | + if (unlikely(err)) | |
11584 | + goto out_dput; | |
11585 | + elm->created = 1; | |
11586 | + elm->info_dentry = dget(infopath.dentry); | |
11587 | + } | |
11588 | + | |
11589 | + infofile = vfsub_dentry_open(&infopath, O_RDWR); | |
11590 | + AuTraceErrPtr(infofile); | |
11591 | + if (IS_ERR(infofile)) { | |
11592 | + err = PTR_ERR(infofile); | |
11593 | + goto out_dput; | |
11594 | + } | |
11595 | + | |
11596 | + h_inode = d_inode(infopath.dentry); | |
11597 | + if (elm && i_size_read(h_inode)) { | |
11598 | + h_inode = d_inode(w->h_dentry); | |
11599 | + elm->info_last = au_drinfo_read_k(infofile, h_inode->i_ino); | |
11600 | + AuTraceErrPtr(elm->info_last); | |
11601 | + if (IS_ERR(elm->info_last)) { | |
11602 | + err = PTR_ERR(elm->info_last); | |
11603 | + elm->info_last = NULL; | |
11604 | + AuDebugOn(elm->info_dentry); | |
11605 | + goto out_fput; | |
11606 | + } | |
11607 | + } | |
11608 | + | |
11609 | + if (elm && w->renameback) { | |
11610 | + delegated = NULL; | |
11611 | + err = vfsub_unlink(h_dir, &infopath, &delegated, /*force*/0); | |
11612 | + AuTraceErr(err); | |
11613 | + if (unlikely(err == -EWOULDBLOCK)) | |
11614 | + iput(delegated); | |
11615 | + goto out_fput; | |
11616 | + } | |
11617 | + | |
11618 | + pos = 0; | |
11619 | + qname = &w->h_dentry->d_name; | |
11620 | + len = sizeof(*w->fdata) + qname->len; | |
11621 | + if (!elm) | |
11622 | + len = sizeof(*w->fdata) + w->fdata->drinfo.oldnamelen; | |
11623 | + ssz = vfsub_write_k(infofile, w->fdata, len, &pos); | |
11624 | + if (ssz == len) { | |
11625 | + AuDbg("hi%llu, %.*s\n", w->fdata->drinfo.ino, | |
11626 | + w->fdata->drinfo.oldnamelen, w->fdata->drinfo.oldname); | |
11627 | + goto out_fput; /* success */ | |
11628 | + } else { | |
11629 | + err = -EIO; | |
11630 | + if (ssz < 0) | |
11631 | + err = ssz; | |
11632 | + /* the caller should revert it using @elm */ | |
11633 | + } | |
11634 | + | |
11635 | +out_fput: | |
11636 | + fput(infofile); | |
11637 | +out_dput: | |
11638 | + dput(infopath.dentry); | |
11639 | +out: | |
11640 | + AuTraceErr(err); | |
11641 | + return err; | |
11642 | +} | |
11643 | + | |
11644 | +struct au_call_drinfo_do_store_args { | |
11645 | + int *errp; | |
11646 | + struct au_drinfo_store *w; | |
11647 | + struct au_drinfo_rev_elm *elm; | |
11648 | +}; | |
11649 | + | |
11650 | +static void au_call_drinfo_do_store(void *args) | |
11651 | +{ | |
11652 | + struct au_call_drinfo_do_store_args *a = args; | |
11653 | + | |
11654 | + *a->errp = au_drinfo_do_store(a->w, a->elm); | |
11655 | +} | |
11656 | + | |
11657 | +static int au_drinfo_store_sio(struct au_drinfo_store *w, | |
11658 | + struct au_drinfo_rev_elm *elm) | |
11659 | +{ | |
11660 | + int err, wkq_err; | |
11661 | + | |
11662 | + if (w->no_sio) | |
11663 | + err = au_drinfo_do_store(w, elm); | |
11664 | + else { | |
11665 | + struct au_call_drinfo_do_store_args a = { | |
11666 | + .errp = &err, | |
11667 | + .w = w, | |
11668 | + .elm = elm | |
11669 | + }; | |
11670 | + wkq_err = au_wkq_wait(au_call_drinfo_do_store, &a); | |
11671 | + if (unlikely(wkq_err)) | |
11672 | + err = wkq_err; | |
11673 | + } | |
11674 | + AuTraceErr(err); | |
11675 | + | |
11676 | + return err; | |
11677 | +} | |
11678 | + | |
11679 | +static int au_drinfo_store_work_init(struct au_drinfo_store *w, | |
11680 | + aufs_bindex_t btgt) | |
11681 | +{ | |
11682 | + int err; | |
11683 | + | |
11684 | + memset(w, 0, sizeof(*w)); | |
11685 | + w->allocated = roundup_pow_of_two(sizeof(*w->fdata) + 40); | |
11686 | + strcpy(w->whname, AUFS_WH_DR_INFO_PFX); | |
11687 | + w->infoname = w->whname + sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
11688 | + w->infonamelen = sizeof(w->whname) - sizeof(AUFS_WH_DR_INFO_PFX); | |
11689 | + w->btgt = btgt; | |
11690 | + w->no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); | |
11691 | + | |
11692 | + err = -ENOMEM; | |
11693 | + w->fdata = kcalloc(1, w->allocated, GFP_NOFS); | |
11694 | + if (unlikely(!w->fdata)) { | |
11695 | + AuTraceErr(err); | |
11696 | + goto out; | |
11697 | + } | |
11698 | + w->fdata->magic = (__force uint32_t)htonl(AUFS_DRINFO_MAGIC_V1); | |
11699 | + err = 0; | |
11700 | + | |
11701 | +out: | |
11702 | + return err; | |
11703 | +} | |
11704 | + | |
11705 | +static void au_drinfo_store_work_fin(struct au_drinfo_store *w) | |
11706 | +{ | |
9f237c51 | 11707 | + au_kfree_rcu(w->fdata); |
8b6a4947 AM |
11708 | +} |
11709 | + | |
11710 | +static void au_drinfo_store_rev(struct au_drinfo_rev *rev, | |
11711 | + struct au_drinfo_store *w) | |
11712 | +{ | |
11713 | + struct au_drinfo_rev_elm *elm; | |
11714 | + struct inode *h_dir, *delegated; | |
11715 | + int err, nelm; | |
11716 | + struct path infopath = { | |
11717 | + .mnt = w->h_ppath.mnt | |
11718 | + }; | |
11719 | + | |
11720 | + h_dir = d_inode(w->h_ppath.dentry); | |
11721 | + IMustLock(h_dir); | |
11722 | + | |
11723 | + err = 0; | |
11724 | + elm = rev->elm; | |
11725 | + for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { | |
11726 | + AuDebugOn(elm->created && elm->info_last); | |
11727 | + if (elm->created) { | |
11728 | + AuDbg("here\n"); | |
11729 | + delegated = NULL; | |
11730 | + infopath.dentry = elm->info_dentry; | |
11731 | + err = vfsub_unlink(h_dir, &infopath, &delegated, | |
11732 | + !w->no_sio); | |
11733 | + AuTraceErr(err); | |
11734 | + if (unlikely(err == -EWOULDBLOCK)) | |
11735 | + iput(delegated); | |
11736 | + dput(elm->info_dentry); | |
11737 | + } else if (elm->info_last) { | |
11738 | + AuDbg("here\n"); | |
11739 | + w->fdata->drinfo = *elm->info_last; | |
11740 | + memcpy(w->fdata->drinfo.oldname, | |
11741 | + elm->info_last->oldname, | |
11742 | + elm->info_last->oldnamelen); | |
11743 | + err = au_drinfo_store_sio(w, /*elm*/NULL); | |
9f237c51 | 11744 | + au_kfree_rcu(elm->info_last); |
8b6a4947 AM |
11745 | + } |
11746 | + if (unlikely(err)) | |
11747 | + AuIOErr("%d, %s\n", err, w->whname); | |
11748 | + /* go on even if err */ | |
11749 | + } | |
11750 | +} | |
11751 | + | |
11752 | +/* caller has to call au_dr_rename_fin() later */ | |
11753 | +static int au_drinfo_store(struct dentry *dentry, aufs_bindex_t btgt, | |
11754 | + struct qstr *dst_name, void *_rev) | |
11755 | +{ | |
11756 | + int err, sz, nelm; | |
11757 | + aufs_bindex_t bindex, btail; | |
11758 | + struct au_drinfo_store work; | |
11759 | + struct au_drinfo_rev *rev, **p; | |
11760 | + struct au_drinfo_rev_elm *elm; | |
11761 | + struct super_block *sb; | |
11762 | + struct au_branch *br; | |
11763 | + struct au_hinode *hdir; | |
11764 | + | |
11765 | + err = au_drinfo_store_work_init(&work, btgt); | |
11766 | + AuTraceErr(err); | |
11767 | + if (unlikely(err)) | |
11768 | + goto out; | |
11769 | + | |
11770 | + err = -ENOMEM; | |
11771 | + btail = au_dbtaildir(dentry); | |
11772 | + nelm = btail - btgt; | |
11773 | + sz = sizeof(*rev) + sizeof(*elm) * nelm; | |
11774 | + rev = kcalloc(1, sz, GFP_NOFS); | |
11775 | + if (unlikely(!rev)) { | |
11776 | + AuTraceErr(err); | |
11777 | + goto out_args; | |
11778 | + } | |
11779 | + rev->nelm = nelm; | |
11780 | + elm = rev->elm; | |
11781 | + p = _rev; | |
11782 | + *p = rev; | |
11783 | + | |
11784 | + err = 0; | |
11785 | + sb = dentry->d_sb; | |
11786 | + work.h_ppath.dentry = au_h_dptr(dentry, btgt); | |
11787 | + work.h_ppath.mnt = au_sbr_mnt(sb, btgt); | |
11788 | + hdir = au_hi(d_inode(dentry), btgt); | |
11789 | + au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); | |
11790 | + for (bindex = btgt + 1; bindex <= btail; bindex++, elm++) { | |
11791 | + work.h_dentry = au_h_dptr(dentry, bindex); | |
11792 | + if (!work.h_dentry) | |
11793 | + continue; | |
11794 | + | |
11795 | + err = au_drinfo_construct(&work.fdata, work.h_dentry, | |
11796 | + &work.allocated); | |
11797 | + AuTraceErr(err); | |
11798 | + if (unlikely(err)) | |
11799 | + break; | |
11800 | + | |
11801 | + work.renameback = au_qstreq(&work.h_dentry->d_name, dst_name); | |
11802 | + br = au_sbr(sb, bindex); | |
11803 | + work.whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
11804 | + work.whnamelen += au_drinfo_name(br, work.infoname, | |
11805 | + work.infonamelen); | |
11806 | + AuDbg("whname %.*s, i%llu, %.*s\n", | |
11807 | + work.whnamelen, work.whname, | |
11808 | + be64_to_cpu((__force __be64)work.fdata->drinfo.ino), | |
11809 | + work.fdata->drinfo.oldnamelen, | |
11810 | + work.fdata->drinfo.oldname); | |
11811 | + | |
11812 | + err = au_drinfo_store_sio(&work, elm); | |
11813 | + AuTraceErr(err); | |
11814 | + if (unlikely(err)) | |
11815 | + break; | |
11816 | + } | |
11817 | + if (unlikely(err)) { | |
11818 | + /* revert all drinfo */ | |
11819 | + au_drinfo_store_rev(rev, &work); | |
9f237c51 | 11820 | + au_kfree_try_rcu(rev); |
8b6a4947 AM |
11821 | + *p = NULL; |
11822 | + } | |
11823 | + au_hn_inode_unlock(hdir); | |
11824 | + | |
11825 | +out_args: | |
11826 | + au_drinfo_store_work_fin(&work); | |
11827 | +out: | |
11828 | + return err; | |
11829 | +} | |
11830 | + | |
11831 | +/* ---------------------------------------------------------------------- */ | |
11832 | + | |
11833 | +int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, | |
11834 | + struct qstr *dst_name, void *_rev) | |
11835 | +{ | |
11836 | + int err, already; | |
11837 | + ino_t ino; | |
11838 | + struct super_block *sb; | |
11839 | + struct au_branch *br; | |
11840 | + struct au_dr_br *dr; | |
11841 | + struct dentry *h_dentry; | |
11842 | + struct inode *h_inode; | |
11843 | + struct au_dr_hino *ent; | |
11844 | + struct au_drinfo_rev *rev, **p; | |
11845 | + | |
11846 | + AuDbg("bindex %d\n", bindex); | |
11847 | + | |
11848 | + err = -ENOMEM; | |
11849 | + ent = kmalloc(sizeof(*ent), GFP_NOFS); | |
11850 | + if (unlikely(!ent)) | |
11851 | + goto out; | |
11852 | + | |
11853 | + sb = src->d_sb; | |
11854 | + br = au_sbr(sb, bindex); | |
11855 | + dr = &br->br_dirren; | |
11856 | + h_dentry = au_h_dptr(src, bindex); | |
11857 | + h_inode = d_inode(h_dentry); | |
11858 | + ino = h_inode->i_ino; | |
11859 | + ent->dr_h_ino = ino; | |
11860 | + already = au_dr_hino_test_add(dr, ino, ent); | |
11861 | + AuDbg("b%d, hi%llu, already %d\n", | |
11862 | + bindex, (unsigned long long)ino, already); | |
11863 | + | |
11864 | + err = au_drinfo_store(src, bindex, dst_name, _rev); | |
11865 | + AuTraceErr(err); | |
11866 | + if (!err) { | |
11867 | + p = _rev; | |
11868 | + rev = *p; | |
11869 | + rev->already = already; | |
11870 | + goto out; /* success */ | |
11871 | + } | |
11872 | + | |
11873 | + /* revert */ | |
11874 | + if (!already) | |
11875 | + au_dr_hino_del(dr, ent); | |
9f237c51 | 11876 | + au_kfree_rcu(ent); |
8b6a4947 AM |
11877 | + |
11878 | +out: | |
11879 | + AuTraceErr(err); | |
11880 | + return err; | |
11881 | +} | |
11882 | + | |
11883 | +void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *_rev) | |
11884 | +{ | |
11885 | + struct au_drinfo_rev *rev; | |
11886 | + struct au_drinfo_rev_elm *elm; | |
11887 | + int nelm; | |
11888 | + | |
11889 | + rev = _rev; | |
11890 | + elm = rev->elm; | |
11891 | + for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { | |
11892 | + dput(elm->info_dentry); | |
9f237c51 | 11893 | + au_kfree_rcu(elm->info_last); |
8b6a4947 | 11894 | + } |
9f237c51 | 11895 | + au_kfree_try_rcu(rev); |
8b6a4947 AM |
11896 | +} |
11897 | + | |
11898 | +void au_dr_rename_rev(struct dentry *src, aufs_bindex_t btgt, void *_rev) | |
11899 | +{ | |
11900 | + int err; | |
11901 | + struct au_drinfo_store work; | |
11902 | + struct au_drinfo_rev *rev = _rev; | |
11903 | + struct super_block *sb; | |
11904 | + struct au_branch *br; | |
11905 | + struct inode *h_inode; | |
11906 | + struct au_dr_br *dr; | |
11907 | + struct au_dr_hino *ent; | |
11908 | + | |
11909 | + err = au_drinfo_store_work_init(&work, btgt); | |
11910 | + if (unlikely(err)) | |
11911 | + goto out; | |
11912 | + | |
11913 | + sb = src->d_sb; | |
11914 | + br = au_sbr(sb, btgt); | |
11915 | + work.h_ppath.dentry = au_h_dptr(src, btgt); | |
11916 | + work.h_ppath.mnt = au_br_mnt(br); | |
11917 | + au_drinfo_store_rev(rev, &work); | |
11918 | + au_drinfo_store_work_fin(&work); | |
11919 | + if (rev->already) | |
11920 | + goto out; | |
11921 | + | |
11922 | + dr = &br->br_dirren; | |
11923 | + h_inode = d_inode(work.h_ppath.dentry); | |
11924 | + ent = au_dr_hino_find(dr, h_inode->i_ino); | |
11925 | + BUG_ON(!ent); | |
11926 | + au_dr_hino_del(dr, ent); | |
9f237c51 | 11927 | + au_kfree_rcu(ent); |
8b6a4947 AM |
11928 | + |
11929 | +out: | |
9f237c51 | 11930 | + au_kfree_try_rcu(rev); |
8b6a4947 AM |
11931 | + if (unlikely(err)) |
11932 | + pr_err("failed to remove dirren info\n"); | |
11933 | +} | |
11934 | + | |
11935 | +/* ---------------------------------------------------------------------- */ | |
11936 | + | |
11937 | +static struct au_drinfo *au_drinfo_do_load(struct path *h_ppath, | |
11938 | + char *whname, int whnamelen, | |
11939 | + struct dentry **info_dentry) | |
11940 | +{ | |
11941 | + struct au_drinfo *drinfo; | |
11942 | + struct file *f; | |
11943 | + struct inode *h_dir; | |
11944 | + struct path infopath; | |
11945 | + int unlocked; | |
11946 | + | |
11947 | + AuDbg("%pd/%.*s\n", h_ppath->dentry, whnamelen, whname); | |
11948 | + | |
11949 | + *info_dentry = NULL; | |
11950 | + drinfo = NULL; | |
11951 | + unlocked = 0; | |
11952 | + h_dir = d_inode(h_ppath->dentry); | |
be118d29 | 11953 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
8b6a4947 AM |
11954 | + infopath.dentry = vfsub_lookup_one_len(whname, h_ppath->dentry, |
11955 | + whnamelen); | |
11956 | + if (IS_ERR(infopath.dentry)) { | |
11957 | + drinfo = (void *)infopath.dentry; | |
11958 | + goto out; | |
11959 | + } | |
11960 | + | |
11961 | + if (d_is_negative(infopath.dentry)) | |
11962 | + goto out_dput; /* success */ | |
11963 | + | |
11964 | + infopath.mnt = h_ppath->mnt; | |
11965 | + f = vfsub_dentry_open(&infopath, O_RDONLY); | |
11966 | + inode_unlock_shared(h_dir); | |
11967 | + unlocked = 1; | |
11968 | + if (IS_ERR(f)) { | |
11969 | + drinfo = (void *)f; | |
11970 | + goto out_dput; | |
11971 | + } | |
11972 | + | |
11973 | + drinfo = au_drinfo_read_k(f, /*h_ino*/0); | |
11974 | + if (IS_ERR_OR_NULL(drinfo)) | |
11975 | + goto out_fput; | |
11976 | + | |
11977 | + AuDbg("oldname %.*s\n", drinfo->oldnamelen, drinfo->oldname); | |
11978 | + *info_dentry = dget(infopath.dentry); /* keep it alive */ | |
11979 | + | |
11980 | +out_fput: | |
11981 | + fput(f); | |
11982 | +out_dput: | |
11983 | + dput(infopath.dentry); | |
11984 | +out: | |
11985 | + if (!unlocked) | |
11986 | + inode_unlock_shared(h_dir); | |
11987 | + AuTraceErrPtr(drinfo); | |
11988 | + return drinfo; | |
11989 | +} | |
11990 | + | |
11991 | +struct au_drinfo_do_load_args { | |
11992 | + struct au_drinfo **drinfop; | |
11993 | + struct path *h_ppath; | |
11994 | + char *whname; | |
11995 | + int whnamelen; | |
11996 | + struct dentry **info_dentry; | |
11997 | +}; | |
11998 | + | |
11999 | +static void au_call_drinfo_do_load(void *args) | |
12000 | +{ | |
12001 | + struct au_drinfo_do_load_args *a = args; | |
12002 | + | |
12003 | + *a->drinfop = au_drinfo_do_load(a->h_ppath, a->whname, a->whnamelen, | |
12004 | + a->info_dentry); | |
12005 | +} | |
12006 | + | |
12007 | +struct au_drinfo_load { | |
12008 | + struct path h_ppath; | |
12009 | + struct qstr *qname; | |
12010 | + unsigned char no_sio; | |
12011 | + | |
12012 | + aufs_bindex_t ninfo; | |
12013 | + struct au_drinfo **drinfo; | |
12014 | +}; | |
12015 | + | |
12016 | +static int au_drinfo_load(struct au_drinfo_load *w, aufs_bindex_t bindex, | |
12017 | + struct au_branch *br) | |
12018 | +{ | |
12019 | + int err, wkq_err, whnamelen, e; | |
12020 | + char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ] | |
12021 | + = AUFS_WH_DR_INFO_PFX; | |
12022 | + struct au_drinfo *drinfo; | |
12023 | + struct qstr oldname; | |
12024 | + struct inode *h_dir, *delegated; | |
12025 | + struct dentry *info_dentry; | |
12026 | + struct path infopath; | |
12027 | + | |
12028 | + whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
12029 | + whnamelen += au_drinfo_name(br, whname + whnamelen, | |
12030 | + sizeof(whname) - whnamelen); | |
12031 | + if (w->no_sio) | |
12032 | + drinfo = au_drinfo_do_load(&w->h_ppath, whname, whnamelen, | |
12033 | + &info_dentry); | |
12034 | + else { | |
12035 | + struct au_drinfo_do_load_args args = { | |
12036 | + .drinfop = &drinfo, | |
12037 | + .h_ppath = &w->h_ppath, | |
12038 | + .whname = whname, | |
12039 | + .whnamelen = whnamelen, | |
12040 | + .info_dentry = &info_dentry | |
12041 | + }; | |
12042 | + wkq_err = au_wkq_wait(au_call_drinfo_do_load, &args); | |
12043 | + if (unlikely(wkq_err)) | |
12044 | + drinfo = ERR_PTR(wkq_err); | |
12045 | + } | |
12046 | + err = PTR_ERR(drinfo); | |
12047 | + if (IS_ERR_OR_NULL(drinfo)) | |
12048 | + goto out; | |
12049 | + | |
12050 | + err = 0; | |
12051 | + oldname.len = drinfo->oldnamelen; | |
12052 | + oldname.name = drinfo->oldname; | |
12053 | + if (au_qstreq(w->qname, &oldname)) { | |
12054 | + /* the name is renamed back */ | |
9f237c51 | 12055 | + au_kfree_rcu(drinfo); |
8b6a4947 AM |
12056 | + drinfo = NULL; |
12057 | + | |
12058 | + infopath.dentry = info_dentry; | |
12059 | + infopath.mnt = w->h_ppath.mnt; | |
12060 | + h_dir = d_inode(w->h_ppath.dentry); | |
12061 | + delegated = NULL; | |
12062 | + inode_lock_nested(h_dir, AuLsc_I_PARENT); | |
12063 | + e = vfsub_unlink(h_dir, &infopath, &delegated, !w->no_sio); | |
12064 | + inode_unlock(h_dir); | |
12065 | + if (unlikely(e)) | |
12066 | + AuIOErr("ignored %d, %pd2\n", e, &infopath.dentry); | |
12067 | + if (unlikely(e == -EWOULDBLOCK)) | |
12068 | + iput(delegated); | |
12069 | + } | |
9f237c51 | 12070 | + au_kfree_rcu(w->drinfo[bindex]); |
8b6a4947 AM |
12071 | + w->drinfo[bindex] = drinfo; |
12072 | + dput(info_dentry); | |
12073 | + | |
12074 | +out: | |
12075 | + AuTraceErr(err); | |
12076 | + return err; | |
12077 | +} | |
12078 | + | |
12079 | +/* ---------------------------------------------------------------------- */ | |
12080 | + | |
12081 | +static void au_dr_lkup_free(struct au_drinfo **drinfo, int n) | |
12082 | +{ | |
12083 | + struct au_drinfo **p = drinfo; | |
12084 | + | |
12085 | + while (n-- > 0) | |
9f237c51 AM |
12086 | + au_kfree_rcu(*drinfo++); |
12087 | + au_kfree_try_rcu(p); | |
8b6a4947 AM |
12088 | +} |
12089 | + | |
12090 | +int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12091 | + aufs_bindex_t btgt) | |
12092 | +{ | |
12093 | + int err, ninfo; | |
12094 | + struct au_drinfo_load w; | |
12095 | + aufs_bindex_t bindex, bbot; | |
12096 | + struct au_branch *br; | |
12097 | + struct inode *h_dir; | |
12098 | + struct au_dr_hino *ent; | |
12099 | + struct super_block *sb; | |
12100 | + | |
12101 | + AuDbg("%.*s, name %.*s, whname %.*s, b%d\n", | |
12102 | + AuLNPair(&dentry->d_name), AuLNPair(&lkup->dirren.dr_name), | |
12103 | + AuLNPair(&lkup->whname), btgt); | |
12104 | + | |
12105 | + sb = dentry->d_sb; | |
12106 | + bbot = au_sbbot(sb); | |
12107 | + w.ninfo = bbot + 1; | |
12108 | + if (!lkup->dirren.drinfo) { | |
12109 | + lkup->dirren.drinfo = kcalloc(w.ninfo, | |
12110 | + sizeof(*lkup->dirren.drinfo), | |
12111 | + GFP_NOFS); | |
12112 | + if (unlikely(!lkup->dirren.drinfo)) { | |
12113 | + err = -ENOMEM; | |
12114 | + goto out; | |
12115 | + } | |
12116 | + lkup->dirren.ninfo = w.ninfo; | |
12117 | + } | |
12118 | + w.drinfo = lkup->dirren.drinfo; | |
12119 | + w.no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); | |
12120 | + w.h_ppath.dentry = au_h_dptr(dentry, btgt); | |
12121 | + AuDebugOn(!w.h_ppath.dentry); | |
12122 | + w.h_ppath.mnt = au_sbr_mnt(sb, btgt); | |
12123 | + w.qname = &dentry->d_name; | |
12124 | + | |
12125 | + ninfo = 0; | |
12126 | + for (bindex = btgt + 1; bindex <= bbot; bindex++) { | |
12127 | + br = au_sbr(sb, bindex); | |
12128 | + err = au_drinfo_load(&w, bindex, br); | |
12129 | + if (unlikely(err)) | |
12130 | + goto out_free; | |
12131 | + if (w.drinfo[bindex]) | |
12132 | + ninfo++; | |
12133 | + } | |
12134 | + if (!ninfo) { | |
12135 | + br = au_sbr(sb, btgt); | |
12136 | + h_dir = d_inode(w.h_ppath.dentry); | |
12137 | + ent = au_dr_hino_find(&br->br_dirren, h_dir->i_ino); | |
12138 | + AuDebugOn(!ent); | |
12139 | + au_dr_hino_del(&br->br_dirren, ent); | |
9f237c51 | 12140 | + au_kfree_rcu(ent); |
8b6a4947 AM |
12141 | + } |
12142 | + goto out; /* success */ | |
12143 | + | |
12144 | +out_free: | |
12145 | + au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); | |
12146 | + lkup->dirren.ninfo = 0; | |
12147 | + lkup->dirren.drinfo = NULL; | |
12148 | +out: | |
12149 | + AuTraceErr(err); | |
12150 | + return err; | |
12151 | +} | |
12152 | + | |
12153 | +void au_dr_lkup_fin(struct au_do_lookup_args *lkup) | |
12154 | +{ | |
12155 | + au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); | |
12156 | +} | |
12157 | + | |
12158 | +int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt) | |
12159 | +{ | |
12160 | + int err; | |
12161 | + struct au_drinfo *drinfo; | |
12162 | + | |
12163 | + err = 0; | |
12164 | + if (!lkup->dirren.drinfo) | |
12165 | + goto out; | |
43982f53 AM |
12166 | + AuDebugOn(lkup->dirren.ninfo <= btgt); |
12167 | + drinfo = lkup->dirren.drinfo[btgt]; | |
8b6a4947 AM |
12168 | + if (!drinfo) |
12169 | + goto out; | |
12170 | + | |
9f237c51 | 12171 | + au_kfree_try_rcu(lkup->whname.name); |
8b6a4947 AM |
12172 | + lkup->whname.name = NULL; |
12173 | + lkup->dirren.dr_name.len = drinfo->oldnamelen; | |
12174 | + lkup->dirren.dr_name.name = drinfo->oldname; | |
12175 | + lkup->name = &lkup->dirren.dr_name; | |
12176 | + err = au_wh_name_alloc(&lkup->whname, lkup->name); | |
12177 | + if (!err) | |
12178 | + AuDbg("name %.*s, whname %.*s, b%d\n", | |
12179 | + AuLNPair(lkup->name), AuLNPair(&lkup->whname), | |
12180 | + btgt); | |
12181 | + | |
12182 | +out: | |
12183 | + AuTraceErr(err); | |
12184 | + return err; | |
12185 | +} | |
12186 | + | |
12187 | +int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, | |
12188 | + ino_t h_ino) | |
12189 | +{ | |
12190 | + int match; | |
12191 | + struct au_drinfo *drinfo; | |
12192 | + | |
12193 | + match = 1; | |
12194 | + if (!lkup->dirren.drinfo) | |
12195 | + goto out; | |
43982f53 AM |
12196 | + AuDebugOn(lkup->dirren.ninfo <= bindex); |
12197 | + drinfo = lkup->dirren.drinfo[bindex]; | |
8b6a4947 AM |
12198 | + if (!drinfo) |
12199 | + goto out; | |
12200 | + | |
12201 | + match = (drinfo->ino == h_ino); | |
12202 | + AuDbg("match %d\n", match); | |
12203 | + | |
12204 | +out: | |
12205 | + return match; | |
12206 | +} | |
12207 | + | |
12208 | +/* ---------------------------------------------------------------------- */ | |
12209 | + | |
12210 | +int au_dr_opt_set(struct super_block *sb) | |
12211 | +{ | |
12212 | + int err; | |
12213 | + aufs_bindex_t bindex, bbot; | |
12214 | + struct au_branch *br; | |
12215 | + | |
12216 | + err = 0; | |
12217 | + bbot = au_sbbot(sb); | |
12218 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
12219 | + br = au_sbr(sb, bindex); | |
12220 | + err = au_dr_hino(sb, bindex, /*br*/NULL, &br->br_path); | |
12221 | + } | |
12222 | + | |
12223 | + return err; | |
12224 | +} | |
12225 | + | |
12226 | +int au_dr_opt_flush(struct super_block *sb) | |
12227 | +{ | |
12228 | + int err; | |
12229 | + aufs_bindex_t bindex, bbot; | |
12230 | + struct au_branch *br; | |
12231 | + | |
12232 | + err = 0; | |
12233 | + bbot = au_sbbot(sb); | |
12234 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
12235 | + br = au_sbr(sb, bindex); | |
12236 | + if (au_br_writable(br->br_perm)) | |
12237 | + err = au_dr_hino(sb, bindex, /*br*/NULL, /*path*/NULL); | |
12238 | + } | |
12239 | + | |
12240 | + return err; | |
12241 | +} | |
12242 | + | |
12243 | +int au_dr_opt_clr(struct super_block *sb, int no_flush) | |
12244 | +{ | |
12245 | + int err; | |
12246 | + aufs_bindex_t bindex, bbot; | |
12247 | + struct au_branch *br; | |
12248 | + | |
12249 | + err = 0; | |
12250 | + if (!no_flush) { | |
12251 | + err = au_dr_opt_flush(sb); | |
12252 | + if (unlikely(err)) | |
12253 | + goto out; | |
12254 | + } | |
12255 | + | |
12256 | + bbot = au_sbbot(sb); | |
12257 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
12258 | + br = au_sbr(sb, bindex); | |
12259 | + au_dr_hino_free(&br->br_dirren); | |
12260 | + } | |
12261 | + | |
12262 | +out: | |
12263 | + return err; | |
12264 | +} | |
12265 | diff -urN /usr/share/empty/fs/aufs/dirren.h linux/fs/aufs/dirren.h | |
eca34b5c | 12266 | --- /usr/share/empty/fs/aufs/dirren.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 12267 | +++ linux/fs/aufs/dirren.h 2020-01-27 10:57:18.168871450 +0100 |
062440b3 AM |
12268 | @@ -0,0 +1,140 @@ |
12269 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
8b6a4947 | 12270 | +/* |
016522bc | 12271 | + * Copyright (C) 2017-2020 Junjiro R. Okajima |
8b6a4947 AM |
12272 | + * |
12273 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12274 | + * it under the terms of the GNU General Public License as published by | |
12275 | + * the Free Software Foundation; either version 2 of the License, or | |
12276 | + * (at your option) any later version. | |
12277 | + * | |
12278 | + * This program is distributed in the hope that it will be useful, | |
12279 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12280 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12281 | + * GNU General Public License for more details. | |
12282 | + * | |
12283 | + * You should have received a copy of the GNU General Public License | |
12284 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
12285 | + */ | |
12286 | + | |
12287 | +/* | |
12288 | + * renamed dir info | |
12289 | + */ | |
12290 | + | |
12291 | +#ifndef __AUFS_DIRREN_H__ | |
12292 | +#define __AUFS_DIRREN_H__ | |
12293 | + | |
12294 | +#ifdef __KERNEL__ | |
12295 | + | |
12296 | +#include <linux/dcache.h> | |
12297 | +#include <linux/statfs.h> | |
12298 | +#include <linux/uuid.h> | |
12299 | +#include "hbl.h" | |
12300 | + | |
12301 | +#define AuDirren_NHASH 100 | |
12302 | + | |
12303 | +#ifdef CONFIG_AUFS_DIRREN | |
12304 | +enum au_brid_type { | |
12305 | + AuBrid_Unset, | |
12306 | + AuBrid_UUID, | |
12307 | + AuBrid_FSID, | |
12308 | + AuBrid_DEV | |
12309 | +}; | |
12310 | + | |
12311 | +struct au_dr_brid { | |
12312 | + enum au_brid_type type; | |
12313 | + union { | |
12314 | + uuid_t uuid; /* unimplemented yet */ | |
12315 | + fsid_t fsid; | |
12316 | + dev_t dev; | |
12317 | + }; | |
12318 | +}; | |
12319 | + | |
12320 | +/* 20 is the max digits length of ulong 64 */ | |
12321 | +/* brid-type "_" uuid "_" inum */ | |
12322 | +#define AUFS_DIRREN_FNAME_SZ (1 + 1 + UUID_STRING_LEN + 20) | |
12323 | +#define AUFS_DIRREN_ENV_VAL_SZ (AUFS_DIRREN_FNAME_SZ + 1 + 20) | |
12324 | + | |
12325 | +struct au_dr_hino { | |
12326 | + struct hlist_bl_node dr_hnode; | |
12327 | + ino_t dr_h_ino; | |
12328 | +}; | |
12329 | + | |
12330 | +struct au_dr_br { | |
12331 | + struct hlist_bl_head dr_h_ino[AuDirren_NHASH]; | |
12332 | + struct au_dr_brid dr_brid; | |
12333 | +}; | |
12334 | + | |
12335 | +struct au_dr_lookup { | |
12336 | + /* dr_name is pointed by struct au_do_lookup_args.name */ | |
12337 | + struct qstr dr_name; /* subset of dr_info */ | |
12338 | + aufs_bindex_t ninfo; | |
12339 | + struct au_drinfo **drinfo; | |
12340 | +}; | |
12341 | +#else | |
12342 | +struct au_dr_hino; | |
12343 | +/* empty */ | |
12344 | +struct au_dr_br { }; | |
12345 | +struct au_dr_lookup { }; | |
12346 | +#endif | |
12347 | + | |
12348 | +/* ---------------------------------------------------------------------- */ | |
12349 | + | |
12350 | +struct au_branch; | |
12351 | +struct au_do_lookup_args; | |
12352 | +struct au_hinode; | |
12353 | +#ifdef CONFIG_AUFS_DIRREN | |
12354 | +int au_dr_hino_test_add(struct au_dr_br *dr, ino_t h_ino, | |
12355 | + struct au_dr_hino *add_ent); | |
12356 | +void au_dr_hino_free(struct au_dr_br *dr); | |
12357 | +int au_dr_br_init(struct super_block *sb, struct au_branch *br, | |
12358 | + const struct path *path); | |
12359 | +int au_dr_br_fin(struct super_block *sb, struct au_branch *br); | |
12360 | +int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, | |
12361 | + struct qstr *dst_name, void *_rev); | |
12362 | +void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *rev); | |
12363 | +void au_dr_rename_rev(struct dentry *src, aufs_bindex_t bindex, void *rev); | |
12364 | +int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12365 | + aufs_bindex_t bindex); | |
12366 | +int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt); | |
12367 | +int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, | |
12368 | + ino_t h_ino); | |
12369 | +void au_dr_lkup_fin(struct au_do_lookup_args *lkup); | |
12370 | +int au_dr_opt_set(struct super_block *sb); | |
12371 | +int au_dr_opt_flush(struct super_block *sb); | |
12372 | +int au_dr_opt_clr(struct super_block *sb, int no_flush); | |
12373 | +#else | |
12374 | +AuStubInt0(au_dr_hino_test_add, struct au_dr_br *dr, ino_t h_ino, | |
12375 | + struct au_dr_hino *add_ent); | |
12376 | +AuStubVoid(au_dr_hino_free, struct au_dr_br *dr); | |
12377 | +AuStubInt0(au_dr_br_init, struct super_block *sb, struct au_branch *br, | |
12378 | + const struct path *path); | |
12379 | +AuStubInt0(au_dr_br_fin, struct super_block *sb, struct au_branch *br); | |
12380 | +AuStubInt0(au_dr_rename, struct dentry *src, aufs_bindex_t bindex, | |
12381 | + struct qstr *dst_name, void *_rev); | |
12382 | +AuStubVoid(au_dr_rename_fin, struct dentry *src, aufs_bindex_t btgt, void *rev); | |
12383 | +AuStubVoid(au_dr_rename_rev, struct dentry *src, aufs_bindex_t bindex, | |
12384 | + void *rev); | |
12385 | +AuStubInt0(au_dr_lkup, struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12386 | + aufs_bindex_t bindex); | |
12387 | +AuStubInt0(au_dr_lkup_name, struct au_do_lookup_args *lkup, aufs_bindex_t btgt); | |
12388 | +AuStubInt0(au_dr_lkup_h_ino, struct au_do_lookup_args *lkup, | |
12389 | + aufs_bindex_t bindex, ino_t h_ino); | |
12390 | +AuStubVoid(au_dr_lkup_fin, struct au_do_lookup_args *lkup); | |
12391 | +AuStubInt0(au_dr_opt_set, struct super_block *sb); | |
12392 | +AuStubInt0(au_dr_opt_flush, struct super_block *sb); | |
12393 | +AuStubInt0(au_dr_opt_clr, struct super_block *sb, int no_flush); | |
12394 | +#endif | |
12395 | + | |
12396 | +/* ---------------------------------------------------------------------- */ | |
12397 | + | |
12398 | +#ifdef CONFIG_AUFS_DIRREN | |
12399 | +static inline int au_dr_ihash(ino_t h_ino) | |
12400 | +{ | |
12401 | + return h_ino % AuDirren_NHASH; | |
12402 | +} | |
12403 | +#else | |
12404 | +AuStubInt0(au_dr_ihash, ino_t h_ino); | |
12405 | +#endif | |
12406 | + | |
12407 | +#endif /* __KERNEL__ */ | |
12408 | +#endif /* __AUFS_DIRREN_H__ */ | |
7f207e10 | 12409 | diff -urN /usr/share/empty/fs/aufs/dynop.c linux/fs/aufs/dynop.c |
eca34b5c | 12410 | --- /usr/share/empty/fs/aufs/dynop.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 12411 | +++ linux/fs/aufs/dynop.c 2020-01-27 10:57:18.168871450 +0100 |
fbc438ed | 12412 | @@ -0,0 +1,367 @@ |
cd7a4cd9 | 12413 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 12414 | +/* |
016522bc | 12415 | + * Copyright (C) 2010-2020 Junjiro R. Okajima |
1facf9fc | 12416 | + * |
12417 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12418 | + * it under the terms of the GNU General Public License as published by | |
12419 | + * the Free Software Foundation; either version 2 of the License, or | |
12420 | + * (at your option) any later version. | |
dece6358 AM |
12421 | + * |
12422 | + * This program is distributed in the hope that it will be useful, | |
12423 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12424 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12425 | + * GNU General Public License for more details. | |
12426 | + * | |
12427 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12428 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 12429 | + */ |
12430 | + | |
12431 | +/* | |
4a4d8108 | 12432 | + * dynamically customizable operations for regular files |
1facf9fc | 12433 | + */ |
12434 | + | |
1facf9fc | 12435 | +#include "aufs.h" |
12436 | + | |
4a4d8108 | 12437 | +#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop) |
1facf9fc | 12438 | + |
4a4d8108 AM |
12439 | +/* |
12440 | + * How large will these lists be? | |
12441 | + * Usually just a few elements, 20-30 at most for each, I guess. | |
12442 | + */ | |
8b6a4947 | 12443 | +static struct hlist_bl_head dynop[AuDyLast]; |
4a4d8108 | 12444 | + |
8b6a4947 AM |
12445 | +static struct au_dykey *dy_gfind_get(struct hlist_bl_head *hbl, |
12446 | + const void *h_op) | |
1facf9fc | 12447 | +{ |
4a4d8108 | 12448 | + struct au_dykey *key, *tmp; |
8b6a4947 | 12449 | + struct hlist_bl_node *pos; |
1facf9fc | 12450 | + |
4a4d8108 | 12451 | + key = NULL; |
8b6a4947 AM |
12452 | + hlist_bl_lock(hbl); |
12453 | + hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) | |
4a4d8108 | 12454 | + if (tmp->dk_op.dy_hop == h_op) { |
83b672a5 AM |
12455 | + if (kref_get_unless_zero(&tmp->dk_kref)) |
12456 | + key = tmp; | |
4a4d8108 AM |
12457 | + break; |
12458 | + } | |
8b6a4947 | 12459 | + hlist_bl_unlock(hbl); |
4a4d8108 AM |
12460 | + |
12461 | + return key; | |
1facf9fc | 12462 | +} |
12463 | + | |
4a4d8108 | 12464 | +static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key) |
1facf9fc | 12465 | +{ |
4a4d8108 AM |
12466 | + struct au_dykey **k, *found; |
12467 | + const void *h_op = key->dk_op.dy_hop; | |
12468 | + int i; | |
1facf9fc | 12469 | + |
4a4d8108 AM |
12470 | + found = NULL; |
12471 | + k = br->br_dykey; | |
12472 | + for (i = 0; i < AuBrDynOp; i++) | |
12473 | + if (k[i]) { | |
12474 | + if (k[i]->dk_op.dy_hop == h_op) { | |
12475 | + found = k[i]; | |
12476 | + break; | |
12477 | + } | |
12478 | + } else | |
12479 | + break; | |
12480 | + if (!found) { | |
12481 | + spin_lock(&br->br_dykey_lock); | |
12482 | + for (; i < AuBrDynOp; i++) | |
12483 | + if (k[i]) { | |
12484 | + if (k[i]->dk_op.dy_hop == h_op) { | |
12485 | + found = k[i]; | |
12486 | + break; | |
12487 | + } | |
12488 | + } else { | |
12489 | + k[i] = key; | |
12490 | + break; | |
12491 | + } | |
12492 | + spin_unlock(&br->br_dykey_lock); | |
12493 | + BUG_ON(i == AuBrDynOp); /* expand the array */ | |
12494 | + } | |
12495 | + | |
12496 | + return found; | |
1facf9fc | 12497 | +} |
12498 | + | |
4a4d8108 | 12499 | +/* kref_get() if @key is already added */ |
8b6a4947 | 12500 | +static struct au_dykey *dy_gadd(struct hlist_bl_head *hbl, struct au_dykey *key) |
4a4d8108 AM |
12501 | +{ |
12502 | + struct au_dykey *tmp, *found; | |
8b6a4947 | 12503 | + struct hlist_bl_node *pos; |
4a4d8108 | 12504 | + const void *h_op = key->dk_op.dy_hop; |
1facf9fc | 12505 | + |
4a4d8108 | 12506 | + found = NULL; |
8b6a4947 AM |
12507 | + hlist_bl_lock(hbl); |
12508 | + hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) | |
4a4d8108 | 12509 | + if (tmp->dk_op.dy_hop == h_op) { |
83b672a5 AM |
12510 | + if (kref_get_unless_zero(&tmp->dk_kref)) |
12511 | + found = tmp; | |
4a4d8108 AM |
12512 | + break; |
12513 | + } | |
12514 | + if (!found) | |
8b6a4947 AM |
12515 | + hlist_bl_add_head(&key->dk_hnode, hbl); |
12516 | + hlist_bl_unlock(hbl); | |
1facf9fc | 12517 | + |
4a4d8108 AM |
12518 | + if (!found) |
12519 | + DyPrSym(key); | |
12520 | + return found; | |
12521 | +} | |
12522 | + | |
12523 | +static void dy_free_rcu(struct rcu_head *rcu) | |
1facf9fc | 12524 | +{ |
4a4d8108 AM |
12525 | + struct au_dykey *key; |
12526 | + | |
12527 | + key = container_of(rcu, struct au_dykey, dk_rcu); | |
12528 | + DyPrSym(key); | |
83b672a5 | 12529 | + kfree(key); |
1facf9fc | 12530 | +} |
12531 | + | |
4a4d8108 AM |
12532 | +static void dy_free(struct kref *kref) |
12533 | +{ | |
12534 | + struct au_dykey *key; | |
8b6a4947 | 12535 | + struct hlist_bl_head *hbl; |
1facf9fc | 12536 | + |
4a4d8108 | 12537 | + key = container_of(kref, struct au_dykey, dk_kref); |
8b6a4947 AM |
12538 | + hbl = dynop + key->dk_op.dy_type; |
12539 | + au_hbl_del(&key->dk_hnode, hbl); | |
4a4d8108 AM |
12540 | + call_rcu(&key->dk_rcu, dy_free_rcu); |
12541 | +} | |
12542 | + | |
12543 | +void au_dy_put(struct au_dykey *key) | |
1facf9fc | 12544 | +{ |
4a4d8108 AM |
12545 | + kref_put(&key->dk_kref, dy_free); |
12546 | +} | |
1facf9fc | 12547 | + |
4a4d8108 AM |
12548 | +/* ---------------------------------------------------------------------- */ |
12549 | + | |
12550 | +#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *)) | |
12551 | + | |
12552 | +#ifdef CONFIG_AUFS_DEBUG | |
12553 | +#define DyDbgDeclare(cnt) unsigned int cnt = 0 | |
4f0767ce | 12554 | +#define DyDbgInc(cnt) do { cnt++; } while (0) |
4a4d8108 AM |
12555 | +#else |
12556 | +#define DyDbgDeclare(cnt) do {} while (0) | |
12557 | +#define DyDbgInc(cnt) do {} while (0) | |
12558 | +#endif | |
12559 | + | |
12560 | +#define DySet(func, dst, src, h_op, h_sb) do { \ | |
12561 | + DyDbgInc(cnt); \ | |
12562 | + if (h_op->func) { \ | |
12563 | + if (src.func) \ | |
12564 | + dst.func = src.func; \ | |
12565 | + else \ | |
12566 | + AuDbg("%s %s\n", au_sbtype(h_sb), #func); \ | |
12567 | + } \ | |
12568 | +} while (0) | |
12569 | + | |
12570 | +#define DySetForce(func, dst, src) do { \ | |
12571 | + AuDebugOn(!src.func); \ | |
12572 | + DyDbgInc(cnt); \ | |
12573 | + dst.func = src.func; \ | |
12574 | +} while (0) | |
12575 | + | |
12576 | +#define DySetAop(func) \ | |
12577 | + DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb) | |
12578 | +#define DySetAopForce(func) \ | |
12579 | + DySetForce(func, dyaop->da_op, aufs_aop) | |
12580 | + | |
12581 | +static void dy_aop(struct au_dykey *key, const void *h_op, | |
12582 | + struct super_block *h_sb __maybe_unused) | |
12583 | +{ | |
12584 | + struct au_dyaop *dyaop = (void *)key; | |
12585 | + const struct address_space_operations *h_aop = h_op; | |
12586 | + DyDbgDeclare(cnt); | |
12587 | + | |
12588 | + AuDbg("%s\n", au_sbtype(h_sb)); | |
12589 | + | |
12590 | + DySetAop(writepage); | |
12591 | + DySetAopForce(readpage); /* force */ | |
4a4d8108 AM |
12592 | + DySetAop(writepages); |
12593 | + DySetAop(set_page_dirty); | |
12594 | + DySetAop(readpages); | |
12595 | + DySetAop(write_begin); | |
12596 | + DySetAop(write_end); | |
12597 | + DySetAop(bmap); | |
12598 | + DySetAop(invalidatepage); | |
12599 | + DySetAop(releasepage); | |
027c5e7a | 12600 | + DySetAop(freepage); |
7e9cd9fe | 12601 | + /* this one will be changed according to an aufs mount option */ |
4a4d8108 | 12602 | + DySetAop(direct_IO); |
4a4d8108 | 12603 | + DySetAop(migratepage); |
e2f27e51 AM |
12604 | + DySetAop(isolate_page); |
12605 | + DySetAop(putback_page); | |
4a4d8108 AM |
12606 | + DySetAop(launder_page); |
12607 | + DySetAop(is_partially_uptodate); | |
392086de | 12608 | + DySetAop(is_dirty_writeback); |
4a4d8108 | 12609 | + DySetAop(error_remove_page); |
b4510431 AM |
12610 | + DySetAop(swap_activate); |
12611 | + DySetAop(swap_deactivate); | |
4a4d8108 AM |
12612 | + |
12613 | + DyDbgSize(cnt, *h_aop); | |
4a4d8108 AM |
12614 | +} |
12615 | + | |
4a4d8108 AM |
12616 | +/* ---------------------------------------------------------------------- */ |
12617 | + | |
12618 | +static void dy_bug(struct kref *kref) | |
12619 | +{ | |
12620 | + BUG(); | |
12621 | +} | |
12622 | + | |
12623 | +static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br) | |
12624 | +{ | |
12625 | + struct au_dykey *key, *old; | |
8b6a4947 | 12626 | + struct hlist_bl_head *hbl; |
b752ccd1 | 12627 | + struct op { |
4a4d8108 | 12628 | + unsigned int sz; |
b752ccd1 AM |
12629 | + void (*set)(struct au_dykey *key, const void *h_op, |
12630 | + struct super_block *h_sb __maybe_unused); | |
12631 | + }; | |
12632 | + static const struct op a[] = { | |
4a4d8108 AM |
12633 | + [AuDy_AOP] = { |
12634 | + .sz = sizeof(struct au_dyaop), | |
b752ccd1 | 12635 | + .set = dy_aop |
4a4d8108 | 12636 | + } |
b752ccd1 AM |
12637 | + }; |
12638 | + const struct op *p; | |
4a4d8108 | 12639 | + |
8b6a4947 AM |
12640 | + hbl = dynop + op->dy_type; |
12641 | + key = dy_gfind_get(hbl, op->dy_hop); | |
4a4d8108 AM |
12642 | + if (key) |
12643 | + goto out_add; /* success */ | |
12644 | + | |
12645 | + p = a + op->dy_type; | |
12646 | + key = kzalloc(p->sz, GFP_NOFS); | |
12647 | + if (unlikely(!key)) { | |
12648 | + key = ERR_PTR(-ENOMEM); | |
12649 | + goto out; | |
12650 | + } | |
12651 | + | |
12652 | + key->dk_op.dy_hop = op->dy_hop; | |
12653 | + kref_init(&key->dk_kref); | |
86dc4139 | 12654 | + p->set(key, op->dy_hop, au_br_sb(br)); |
8b6a4947 | 12655 | + old = dy_gadd(hbl, key); |
4a4d8108 | 12656 | + if (old) { |
9f237c51 | 12657 | + au_kfree_rcu(key); |
4a4d8108 AM |
12658 | + key = old; |
12659 | + } | |
12660 | + | |
12661 | +out_add: | |
12662 | + old = dy_bradd(br, key); | |
12663 | + if (old) | |
12664 | + /* its ref-count should never be zero here */ | |
12665 | + kref_put(&key->dk_kref, dy_bug); | |
12666 | +out: | |
12667 | + return key; | |
12668 | +} | |
12669 | + | |
12670 | +/* ---------------------------------------------------------------------- */ | |
12671 | +/* | |
acd2b654 | 12672 | + * Aufs prohibits O_DIRECT by default even if the branch supports it. |
c1595e42 | 12673 | + * This behaviour is necessary to return an error from open(O_DIRECT) instead |
4a4d8108 AM |
12674 | + * of the succeeding I/O. The dio mount option enables O_DIRECT and makes |
12675 | + * open(O_DIRECT) always succeed, but the succeeding I/O may return an error. | |
12676 | + * See the aufs manual in detail. | |
4a4d8108 AM |
12677 | + */ |
12678 | +static void dy_adx(struct au_dyaop *dyaop, int do_dx) | |
12679 | +{ | |
7e9cd9fe | 12680 | + if (!do_dx) |
4a4d8108 | 12681 | + dyaop->da_op.direct_IO = NULL; |
7e9cd9fe | 12682 | + else |
4a4d8108 | 12683 | + dyaop->da_op.direct_IO = aufs_aop.direct_IO; |
4a4d8108 AM |
12684 | +} |
12685 | + | |
12686 | +static struct au_dyaop *dy_aget(struct au_branch *br, | |
12687 | + const struct address_space_operations *h_aop, | |
12688 | + int do_dx) | |
12689 | +{ | |
12690 | + struct au_dyaop *dyaop; | |
12691 | + struct au_dynop op; | |
12692 | + | |
12693 | + op.dy_type = AuDy_AOP; | |
12694 | + op.dy_haop = h_aop; | |
12695 | + dyaop = (void *)dy_get(&op, br); | |
12696 | + if (IS_ERR(dyaop)) | |
12697 | + goto out; | |
12698 | + dy_adx(dyaop, do_dx); | |
12699 | + | |
12700 | +out: | |
12701 | + return dyaop; | |
12702 | +} | |
12703 | + | |
12704 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
12705 | + struct inode *h_inode) | |
12706 | +{ | |
12707 | + int err, do_dx; | |
12708 | + struct super_block *sb; | |
12709 | + struct au_branch *br; | |
12710 | + struct au_dyaop *dyaop; | |
12711 | + | |
12712 | + AuDebugOn(!S_ISREG(h_inode->i_mode)); | |
12713 | + IiMustWriteLock(inode); | |
12714 | + | |
12715 | + sb = inode->i_sb; | |
12716 | + br = au_sbr(sb, bindex); | |
12717 | + do_dx = !!au_opt_test(au_mntflags(sb), DIO); | |
12718 | + dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx); | |
12719 | + err = PTR_ERR(dyaop); | |
12720 | + if (IS_ERR(dyaop)) | |
12721 | + /* unnecessary to call dy_fput() */ | |
12722 | + goto out; | |
12723 | + | |
12724 | + err = 0; | |
12725 | + inode->i_mapping->a_ops = &dyaop->da_op; | |
12726 | + | |
12727 | +out: | |
12728 | + return err; | |
12729 | +} | |
12730 | + | |
b752ccd1 AM |
12731 | +/* |
12732 | + * Is it safe to replace a_ops during the inode/file is in operation? | |
12733 | + * Yes, I hope so. | |
12734 | + */ | |
12735 | +int au_dy_irefresh(struct inode *inode) | |
12736 | +{ | |
12737 | + int err; | |
5afbbe0d | 12738 | + aufs_bindex_t btop; |
b752ccd1 AM |
12739 | + struct inode *h_inode; |
12740 | + | |
12741 | + err = 0; | |
12742 | + if (S_ISREG(inode->i_mode)) { | |
5afbbe0d AM |
12743 | + btop = au_ibtop(inode); |
12744 | + h_inode = au_h_iptr(inode, btop); | |
12745 | + err = au_dy_iaop(inode, btop, h_inode); | |
b752ccd1 AM |
12746 | + } |
12747 | + return err; | |
12748 | +} | |
12749 | + | |
4a4d8108 AM |
12750 | +void au_dy_arefresh(int do_dx) |
12751 | +{ | |
8b6a4947 AM |
12752 | + struct hlist_bl_head *hbl; |
12753 | + struct hlist_bl_node *pos; | |
4a4d8108 AM |
12754 | + struct au_dykey *key; |
12755 | + | |
8b6a4947 AM |
12756 | + hbl = dynop + AuDy_AOP; |
12757 | + hlist_bl_lock(hbl); | |
12758 | + hlist_bl_for_each_entry(key, pos, hbl, dk_hnode) | |
4a4d8108 | 12759 | + dy_adx((void *)key, do_dx); |
8b6a4947 | 12760 | + hlist_bl_unlock(hbl); |
4a4d8108 AM |
12761 | +} |
12762 | + | |
4a4d8108 AM |
12763 | +/* ---------------------------------------------------------------------- */ |
12764 | + | |
12765 | +void __init au_dy_init(void) | |
12766 | +{ | |
12767 | + int i; | |
12768 | + | |
4a4d8108 | 12769 | + for (i = 0; i < AuDyLast; i++) |
8b6a4947 | 12770 | + INIT_HLIST_BL_HEAD(dynop + i); |
4a4d8108 AM |
12771 | +} |
12772 | + | |
12773 | +void au_dy_fin(void) | |
12774 | +{ | |
12775 | + int i; | |
12776 | + | |
12777 | + for (i = 0; i < AuDyLast; i++) | |
8b6a4947 | 12778 | + WARN_ON(!hlist_bl_empty(dynop + i)); |
4a4d8108 | 12779 | +} |
7f207e10 | 12780 | diff -urN /usr/share/empty/fs/aufs/dynop.h linux/fs/aufs/dynop.h |
eca34b5c | 12781 | --- /usr/share/empty/fs/aufs/dynop.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 12782 | +++ linux/fs/aufs/dynop.h 2020-01-27 10:57:18.168871450 +0100 |
fbc438ed | 12783 | @@ -0,0 +1,77 @@ |
062440b3 | 12784 | +/* SPDX-License-Identifier: GPL-2.0 */ |
4a4d8108 | 12785 | +/* |
016522bc | 12786 | + * Copyright (C) 2010-2020 Junjiro R. Okajima |
4a4d8108 AM |
12787 | + * |
12788 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12789 | + * it under the terms of the GNU General Public License as published by | |
12790 | + * the Free Software Foundation; either version 2 of the License, or | |
12791 | + * (at your option) any later version. | |
12792 | + * | |
12793 | + * This program is distributed in the hope that it will be useful, | |
12794 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12795 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12796 | + * GNU General Public License for more details. | |
12797 | + * | |
12798 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12799 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
12800 | + */ |
12801 | + | |
12802 | +/* | |
12803 | + * dynamically customizable operations (for regular files only) | |
12804 | + */ | |
12805 | + | |
12806 | +#ifndef __AUFS_DYNOP_H__ | |
12807 | +#define __AUFS_DYNOP_H__ | |
12808 | + | |
12809 | +#ifdef __KERNEL__ | |
12810 | + | |
7e9cd9fe AM |
12811 | +#include <linux/fs.h> |
12812 | +#include <linux/kref.h> | |
4a4d8108 | 12813 | + |
2cbb1c4b | 12814 | +enum {AuDy_AOP, AuDyLast}; |
4a4d8108 AM |
12815 | + |
12816 | +struct au_dynop { | |
12817 | + int dy_type; | |
12818 | + union { | |
12819 | + const void *dy_hop; | |
12820 | + const struct address_space_operations *dy_haop; | |
4a4d8108 AM |
12821 | + }; |
12822 | +}; | |
12823 | + | |
12824 | +struct au_dykey { | |
12825 | + union { | |
8b6a4947 | 12826 | + struct hlist_bl_node dk_hnode; |
4a4d8108 AM |
12827 | + struct rcu_head dk_rcu; |
12828 | + }; | |
12829 | + struct au_dynop dk_op; | |
12830 | + | |
12831 | + /* | |
12832 | + * during I am in the branch local array, kref is gotten. when the | |
12833 | + * branch is removed, kref is put. | |
12834 | + */ | |
12835 | + struct kref dk_kref; | |
12836 | +}; | |
12837 | + | |
12838 | +/* stop unioning since their sizes are very different from each other */ | |
12839 | +struct au_dyaop { | |
12840 | + struct au_dykey da_key; | |
12841 | + struct address_space_operations da_op; /* not const */ | |
4a4d8108 | 12842 | +}; |
fbc438ed JR |
12843 | +/* make sure that 'struct au_dykey *' can be any type */ |
12844 | +static_assert(!offsetof(struct au_dyaop, da_key)); | |
4a4d8108 | 12845 | + |
4a4d8108 AM |
12846 | +/* ---------------------------------------------------------------------- */ |
12847 | + | |
12848 | +/* dynop.c */ | |
12849 | +struct au_branch; | |
12850 | +void au_dy_put(struct au_dykey *key); | |
12851 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
12852 | + struct inode *h_inode); | |
b752ccd1 | 12853 | +int au_dy_irefresh(struct inode *inode); |
4a4d8108 | 12854 | +void au_dy_arefresh(int do_dio); |
4a4d8108 AM |
12855 | + |
12856 | +void __init au_dy_init(void); | |
12857 | +void au_dy_fin(void); | |
12858 | + | |
4a4d8108 AM |
12859 | +#endif /* __KERNEL__ */ |
12860 | +#endif /* __AUFS_DYNOP_H__ */ | |
7f207e10 | 12861 | diff -urN /usr/share/empty/fs/aufs/export.c linux/fs/aufs/export.c |
eca34b5c | 12862 | --- /usr/share/empty/fs/aufs/export.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 12863 | +++ linux/fs/aufs/export.c 2020-01-27 10:57:18.168871450 +0100 |
062440b3 | 12864 | @@ -0,0 +1,838 @@ |
cd7a4cd9 | 12865 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 12866 | +/* |
016522bc | 12867 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
12868 | + * |
12869 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12870 | + * it under the terms of the GNU General Public License as published by | |
12871 | + * the Free Software Foundation; either version 2 of the License, or | |
12872 | + * (at your option) any later version. | |
12873 | + * | |
12874 | + * This program is distributed in the hope that it will be useful, | |
12875 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12876 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12877 | + * GNU General Public License for more details. | |
12878 | + * | |
12879 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12880 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
12881 | + */ |
12882 | + | |
12883 | +/* | |
12884 | + * export via nfs | |
12885 | + */ | |
12886 | + | |
12887 | +#include <linux/exportfs.h> | |
7eafdf33 | 12888 | +#include <linux/fs_struct.h> |
4a4d8108 AM |
12889 | +#include <linux/namei.h> |
12890 | +#include <linux/nsproxy.h> | |
12891 | +#include <linux/random.h> | |
12892 | +#include <linux/writeback.h> | |
12893 | +#include "aufs.h" | |
12894 | + | |
12895 | +union conv { | |
12896 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12897 | + __u32 a[2]; | |
12898 | +#else | |
12899 | + __u32 a[1]; | |
12900 | +#endif | |
12901 | + ino_t ino; | |
12902 | +}; | |
12903 | + | |
12904 | +static ino_t decode_ino(__u32 *a) | |
12905 | +{ | |
12906 | + union conv u; | |
12907 | + | |
12908 | + BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a)); | |
12909 | + u.a[0] = a[0]; | |
12910 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12911 | + u.a[1] = a[1]; | |
12912 | +#endif | |
12913 | + return u.ino; | |
12914 | +} | |
12915 | + | |
12916 | +static void encode_ino(__u32 *a, ino_t ino) | |
12917 | +{ | |
12918 | + union conv u; | |
12919 | + | |
12920 | + u.ino = ino; | |
12921 | + a[0] = u.a[0]; | |
12922 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12923 | + a[1] = u.a[1]; | |
12924 | +#endif | |
12925 | +} | |
12926 | + | |
12927 | +/* NFS file handle */ | |
12928 | +enum { | |
12929 | + Fh_br_id, | |
12930 | + Fh_sigen, | |
12931 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12932 | + /* support 64bit inode number */ | |
12933 | + Fh_ino1, | |
12934 | + Fh_ino2, | |
12935 | + Fh_dir_ino1, | |
12936 | + Fh_dir_ino2, | |
12937 | +#else | |
12938 | + Fh_ino1, | |
12939 | + Fh_dir_ino1, | |
12940 | +#endif | |
12941 | + Fh_igen, | |
12942 | + Fh_h_type, | |
12943 | + Fh_tail, | |
12944 | + | |
12945 | + Fh_ino = Fh_ino1, | |
12946 | + Fh_dir_ino = Fh_dir_ino1 | |
12947 | +}; | |
12948 | + | |
12949 | +static int au_test_anon(struct dentry *dentry) | |
12950 | +{ | |
027c5e7a | 12951 | + /* note: read d_flags without d_lock */ |
4a4d8108 AM |
12952 | + return !!(dentry->d_flags & DCACHE_DISCONNECTED); |
12953 | +} | |
12954 | + | |
a2a7ad62 AM |
12955 | +int au_test_nfsd(void) |
12956 | +{ | |
12957 | + int ret; | |
12958 | + struct task_struct *tsk = current; | |
12959 | + char comm[sizeof(tsk->comm)]; | |
12960 | + | |
12961 | + ret = 0; | |
12962 | + if (tsk->flags & PF_KTHREAD) { | |
12963 | + get_task_comm(comm, tsk); | |
12964 | + ret = !strcmp(comm, "nfsd"); | |
12965 | + } | |
12966 | + | |
12967 | + return ret; | |
12968 | +} | |
12969 | + | |
4a4d8108 AM |
12970 | +/* ---------------------------------------------------------------------- */ |
12971 | +/* inode generation external table */ | |
12972 | + | |
b752ccd1 | 12973 | +void au_xigen_inc(struct inode *inode) |
4a4d8108 | 12974 | +{ |
4a4d8108 AM |
12975 | + loff_t pos; |
12976 | + ssize_t sz; | |
12977 | + __u32 igen; | |
12978 | + struct super_block *sb; | |
12979 | + struct au_sbinfo *sbinfo; | |
12980 | + | |
4a4d8108 | 12981 | + sb = inode->i_sb; |
b752ccd1 | 12982 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); |
1facf9fc | 12983 | + |
b752ccd1 | 12984 | + sbinfo = au_sbi(sb); |
1facf9fc | 12985 | + pos = inode->i_ino; |
12986 | + pos *= sizeof(igen); | |
12987 | + igen = inode->i_generation + 1; | |
1facf9fc | 12988 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen, |
12989 | + sizeof(igen), &pos); | |
12990 | + if (sz == sizeof(igen)) | |
b752ccd1 | 12991 | + return; /* success */ |
1facf9fc | 12992 | + |
b752ccd1 | 12993 | + if (unlikely(sz >= 0)) |
1facf9fc | 12994 | + AuIOErr("xigen error (%zd)\n", sz); |
1facf9fc | 12995 | +} |
12996 | + | |
12997 | +int au_xigen_new(struct inode *inode) | |
12998 | +{ | |
12999 | + int err; | |
13000 | + loff_t pos; | |
13001 | + ssize_t sz; | |
13002 | + struct super_block *sb; | |
13003 | + struct au_sbinfo *sbinfo; | |
13004 | + struct file *file; | |
13005 | + | |
13006 | + err = 0; | |
13007 | + /* todo: dirty, at mount time */ | |
13008 | + if (inode->i_ino == AUFS_ROOT_INO) | |
13009 | + goto out; | |
13010 | + sb = inode->i_sb; | |
dece6358 | 13011 | + SiMustAnyLock(sb); |
1facf9fc | 13012 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) |
13013 | + goto out; | |
13014 | + | |
13015 | + err = -EFBIG; | |
13016 | + pos = inode->i_ino; | |
13017 | + if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) { | |
13018 | + AuIOErr1("too large i%lld\n", pos); | |
13019 | + goto out; | |
13020 | + } | |
13021 | + pos *= sizeof(inode->i_generation); | |
13022 | + | |
13023 | + err = 0; | |
13024 | + sbinfo = au_sbi(sb); | |
13025 | + file = sbinfo->si_xigen; | |
13026 | + BUG_ON(!file); | |
13027 | + | |
c06a8ce3 | 13028 | + if (vfsub_f_size_read(file) |
1facf9fc | 13029 | + < pos + sizeof(inode->i_generation)) { |
13030 | + inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next); | |
13031 | + sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation, | |
13032 | + sizeof(inode->i_generation), &pos); | |
13033 | + } else | |
13034 | + sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation, | |
13035 | + sizeof(inode->i_generation), &pos); | |
13036 | + if (sz == sizeof(inode->i_generation)) | |
13037 | + goto out; /* success */ | |
13038 | + | |
13039 | + err = sz; | |
13040 | + if (unlikely(sz >= 0)) { | |
13041 | + err = -EIO; | |
13042 | + AuIOErr("xigen error (%zd)\n", sz); | |
13043 | + } | |
13044 | + | |
4f0767ce | 13045 | +out: |
1facf9fc | 13046 | + return err; |
13047 | +} | |
13048 | + | |
062440b3 | 13049 | +int au_xigen_set(struct super_block *sb, struct path *path) |
1facf9fc | 13050 | +{ |
13051 | + int err; | |
13052 | + struct au_sbinfo *sbinfo; | |
13053 | + struct file *file; | |
13054 | + | |
dece6358 AM |
13055 | + SiMustWriteLock(sb); |
13056 | + | |
1facf9fc | 13057 | + sbinfo = au_sbi(sb); |
062440b3 | 13058 | + file = au_xino_create2(sb, path, sbinfo->si_xigen); |
1facf9fc | 13059 | + err = PTR_ERR(file); |
13060 | + if (IS_ERR(file)) | |
13061 | + goto out; | |
13062 | + err = 0; | |
13063 | + if (sbinfo->si_xigen) | |
13064 | + fput(sbinfo->si_xigen); | |
13065 | + sbinfo->si_xigen = file; | |
13066 | + | |
4f0767ce | 13067 | +out: |
062440b3 | 13068 | + AuTraceErr(err); |
1facf9fc | 13069 | + return err; |
13070 | +} | |
13071 | + | |
13072 | +void au_xigen_clr(struct super_block *sb) | |
13073 | +{ | |
13074 | + struct au_sbinfo *sbinfo; | |
13075 | + | |
dece6358 AM |
13076 | + SiMustWriteLock(sb); |
13077 | + | |
1facf9fc | 13078 | + sbinfo = au_sbi(sb); |
13079 | + if (sbinfo->si_xigen) { | |
13080 | + fput(sbinfo->si_xigen); | |
13081 | + sbinfo->si_xigen = NULL; | |
13082 | + } | |
13083 | +} | |
13084 | + | |
13085 | +/* ---------------------------------------------------------------------- */ | |
13086 | + | |
13087 | +static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino, | |
13088 | + ino_t dir_ino) | |
13089 | +{ | |
13090 | + struct dentry *dentry, *d; | |
13091 | + struct inode *inode; | |
13092 | + unsigned int sigen; | |
13093 | + | |
13094 | + dentry = NULL; | |
13095 | + inode = ilookup(sb, ino); | |
13096 | + if (!inode) | |
13097 | + goto out; | |
13098 | + | |
13099 | + dentry = ERR_PTR(-ESTALE); | |
13100 | + sigen = au_sigen(sb); | |
5afbbe0d | 13101 | + if (unlikely(au_is_bad_inode(inode) |
1facf9fc | 13102 | + || IS_DEADDIR(inode) |
537831f9 | 13103 | + || sigen != au_iigen(inode, NULL))) |
1facf9fc | 13104 | + goto out_iput; |
13105 | + | |
13106 | + dentry = NULL; | |
13107 | + if (!dir_ino || S_ISDIR(inode->i_mode)) | |
13108 | + dentry = d_find_alias(inode); | |
13109 | + else { | |
027c5e7a | 13110 | + spin_lock(&inode->i_lock); |
c1595e42 | 13111 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { |
027c5e7a | 13112 | + spin_lock(&d->d_lock); |
1facf9fc | 13113 | + if (!au_test_anon(d) |
5527c038 | 13114 | + && d_inode(d->d_parent)->i_ino == dir_ino) { |
027c5e7a AM |
13115 | + dentry = dget_dlock(d); |
13116 | + spin_unlock(&d->d_lock); | |
1facf9fc | 13117 | + break; |
13118 | + } | |
027c5e7a AM |
13119 | + spin_unlock(&d->d_lock); |
13120 | + } | |
13121 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 13122 | + } |
027c5e7a | 13123 | + if (unlikely(dentry && au_digen_test(dentry, sigen))) { |
2cbb1c4b | 13124 | + /* need to refresh */ |
1facf9fc | 13125 | + dput(dentry); |
2cbb1c4b | 13126 | + dentry = NULL; |
1facf9fc | 13127 | + } |
13128 | + | |
4f0767ce | 13129 | +out_iput: |
1facf9fc | 13130 | + iput(inode); |
4f0767ce | 13131 | +out: |
2cbb1c4b | 13132 | + AuTraceErrPtr(dentry); |
1facf9fc | 13133 | + return dentry; |
13134 | +} | |
13135 | + | |
13136 | +/* ---------------------------------------------------------------------- */ | |
13137 | + | |
13138 | +/* todo: dirty? */ | |
13139 | +/* if exportfs_decode_fh() passed vfsmount*, we could be happy */ | |
4a4d8108 AM |
13140 | + |
13141 | +struct au_compare_mnt_args { | |
13142 | + /* input */ | |
13143 | + struct super_block *sb; | |
13144 | + | |
13145 | + /* output */ | |
13146 | + struct vfsmount *mnt; | |
13147 | +}; | |
13148 | + | |
13149 | +static int au_compare_mnt(struct vfsmount *mnt, void *arg) | |
13150 | +{ | |
13151 | + struct au_compare_mnt_args *a = arg; | |
13152 | + | |
13153 | + if (mnt->mnt_sb != a->sb) | |
13154 | + return 0; | |
13155 | + a->mnt = mntget(mnt); | |
13156 | + return 1; | |
13157 | +} | |
13158 | + | |
1facf9fc | 13159 | +static struct vfsmount *au_mnt_get(struct super_block *sb) |
13160 | +{ | |
4a4d8108 | 13161 | + int err; |
7eafdf33 | 13162 | + struct path root; |
4a4d8108 AM |
13163 | + struct au_compare_mnt_args args = { |
13164 | + .sb = sb | |
13165 | + }; | |
1facf9fc | 13166 | + |
7eafdf33 | 13167 | + get_fs_root(current->fs, &root); |
523b37e3 | 13168 | + rcu_read_lock(); |
7eafdf33 | 13169 | + err = iterate_mounts(au_compare_mnt, &args, root.mnt); |
523b37e3 | 13170 | + rcu_read_unlock(); |
7eafdf33 | 13171 | + path_put(&root); |
4a4d8108 AM |
13172 | + AuDebugOn(!err); |
13173 | + AuDebugOn(!args.mnt); | |
13174 | + return args.mnt; | |
1facf9fc | 13175 | +} |
13176 | + | |
13177 | +struct au_nfsd_si_lock { | |
4a4d8108 | 13178 | + unsigned int sigen; |
027c5e7a | 13179 | + aufs_bindex_t bindex, br_id; |
1facf9fc | 13180 | + unsigned char force_lock; |
13181 | +}; | |
13182 | + | |
027c5e7a AM |
13183 | +static int si_nfsd_read_lock(struct super_block *sb, |
13184 | + struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 13185 | +{ |
027c5e7a | 13186 | + int err; |
1facf9fc | 13187 | + aufs_bindex_t bindex; |
13188 | + | |
13189 | + si_read_lock(sb, AuLock_FLUSH); | |
13190 | + | |
13191 | + /* branch id may be wrapped around */ | |
027c5e7a | 13192 | + err = 0; |
1facf9fc | 13193 | + bindex = au_br_index(sb, nsi_lock->br_id); |
13194 | + if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb)) | |
13195 | + goto out; /* success */ | |
13196 | + | |
027c5e7a AM |
13197 | + err = -ESTALE; |
13198 | + bindex = -1; | |
1facf9fc | 13199 | + if (!nsi_lock->force_lock) |
13200 | + si_read_unlock(sb); | |
1facf9fc | 13201 | + |
4f0767ce | 13202 | +out: |
027c5e7a AM |
13203 | + nsi_lock->bindex = bindex; |
13204 | + return err; | |
1facf9fc | 13205 | +} |
13206 | + | |
13207 | +struct find_name_by_ino { | |
392086de | 13208 | + struct dir_context ctx; |
1facf9fc | 13209 | + int called, found; |
13210 | + ino_t ino; | |
13211 | + char *name; | |
13212 | + int namelen; | |
13213 | +}; | |
13214 | + | |
13215 | +static int | |
392086de AM |
13216 | +find_name_by_ino(struct dir_context *ctx, const char *name, int namelen, |
13217 | + loff_t offset, u64 ino, unsigned int d_type) | |
1facf9fc | 13218 | +{ |
392086de AM |
13219 | + struct find_name_by_ino *a = container_of(ctx, struct find_name_by_ino, |
13220 | + ctx); | |
1facf9fc | 13221 | + |
13222 | + a->called++; | |
13223 | + if (a->ino != ino) | |
13224 | + return 0; | |
13225 | + | |
13226 | + memcpy(a->name, name, namelen); | |
13227 | + a->namelen = namelen; | |
13228 | + a->found = 1; | |
13229 | + return 1; | |
13230 | +} | |
13231 | + | |
13232 | +static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino, | |
13233 | + struct au_nfsd_si_lock *nsi_lock) | |
13234 | +{ | |
13235 | + struct dentry *dentry, *parent; | |
13236 | + struct file *file; | |
13237 | + struct inode *dir; | |
392086de AM |
13238 | + struct find_name_by_ino arg = { |
13239 | + .ctx = { | |
2000de60 | 13240 | + .actor = find_name_by_ino |
392086de AM |
13241 | + } |
13242 | + }; | |
1facf9fc | 13243 | + int err; |
13244 | + | |
13245 | + parent = path->dentry; | |
13246 | + if (nsi_lock) | |
13247 | + si_read_unlock(parent->d_sb); | |
4a4d8108 | 13248 | + file = vfsub_dentry_open(path, au_dir_roflags); |
1facf9fc | 13249 | + dentry = (void *)file; |
13250 | + if (IS_ERR(file)) | |
13251 | + goto out; | |
13252 | + | |
13253 | + dentry = ERR_PTR(-ENOMEM); | |
537831f9 | 13254 | + arg.name = (void *)__get_free_page(GFP_NOFS); |
1facf9fc | 13255 | + if (unlikely(!arg.name)) |
13256 | + goto out_file; | |
13257 | + arg.ino = ino; | |
13258 | + arg.found = 0; | |
13259 | + do { | |
13260 | + arg.called = 0; | |
13261 | + /* smp_mb(); */ | |
392086de | 13262 | + err = vfsub_iterate_dir(file, &arg.ctx); |
1facf9fc | 13263 | + } while (!err && !arg.found && arg.called); |
13264 | + dentry = ERR_PTR(err); | |
13265 | + if (unlikely(err)) | |
13266 | + goto out_name; | |
1716fcea AM |
13267 | + /* instead of ENOENT */ |
13268 | + dentry = ERR_PTR(-ESTALE); | |
1facf9fc | 13269 | + if (!arg.found) |
13270 | + goto out_name; | |
13271 | + | |
b4510431 | 13272 | + /* do not call vfsub_lkup_one() */ |
5527c038 | 13273 | + dir = d_inode(parent); |
febd17d6 | 13274 | + dentry = vfsub_lookup_one_len_unlocked(arg.name, parent, arg.namelen); |
1facf9fc | 13275 | + AuTraceErrPtr(dentry); |
13276 | + if (IS_ERR(dentry)) | |
13277 | + goto out_name; | |
13278 | + AuDebugOn(au_test_anon(dentry)); | |
5527c038 | 13279 | + if (unlikely(d_really_is_negative(dentry))) { |
1facf9fc | 13280 | + dput(dentry); |
13281 | + dentry = ERR_PTR(-ENOENT); | |
13282 | + } | |
13283 | + | |
4f0767ce | 13284 | +out_name: |
1c60b727 | 13285 | + free_page((unsigned long)arg.name); |
4f0767ce | 13286 | +out_file: |
1facf9fc | 13287 | + fput(file); |
4f0767ce | 13288 | +out: |
1facf9fc | 13289 | + if (unlikely(nsi_lock |
13290 | + && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0)) | |
13291 | + if (!IS_ERR(dentry)) { | |
13292 | + dput(dentry); | |
13293 | + dentry = ERR_PTR(-ESTALE); | |
13294 | + } | |
13295 | + AuTraceErrPtr(dentry); | |
13296 | + return dentry; | |
13297 | +} | |
13298 | + | |
13299 | +static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino, | |
13300 | + ino_t dir_ino, | |
13301 | + struct au_nfsd_si_lock *nsi_lock) | |
13302 | +{ | |
13303 | + struct dentry *dentry; | |
13304 | + struct path path; | |
13305 | + | |
13306 | + if (dir_ino != AUFS_ROOT_INO) { | |
13307 | + path.dentry = decode_by_ino(sb, dir_ino, 0); | |
13308 | + dentry = path.dentry; | |
13309 | + if (!path.dentry || IS_ERR(path.dentry)) | |
13310 | + goto out; | |
13311 | + AuDebugOn(au_test_anon(path.dentry)); | |
13312 | + } else | |
13313 | + path.dentry = dget(sb->s_root); | |
13314 | + | |
13315 | + path.mnt = au_mnt_get(sb); | |
13316 | + dentry = au_lkup_by_ino(&path, ino, nsi_lock); | |
13317 | + path_put(&path); | |
13318 | + | |
4f0767ce | 13319 | +out: |
1facf9fc | 13320 | + AuTraceErrPtr(dentry); |
13321 | + return dentry; | |
13322 | +} | |
13323 | + | |
13324 | +/* ---------------------------------------------------------------------- */ | |
13325 | + | |
13326 | +static int h_acceptable(void *expv, struct dentry *dentry) | |
13327 | +{ | |
13328 | + return 1; | |
13329 | +} | |
13330 | + | |
13331 | +static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath, | |
13332 | + char *buf, int len, struct super_block *sb) | |
13333 | +{ | |
13334 | + char *p; | |
13335 | + int n; | |
13336 | + struct path path; | |
13337 | + | |
13338 | + p = d_path(h_rootpath, buf, len); | |
13339 | + if (IS_ERR(p)) | |
13340 | + goto out; | |
13341 | + n = strlen(p); | |
13342 | + | |
13343 | + path.mnt = h_rootpath->mnt; | |
13344 | + path.dentry = h_parent; | |
13345 | + p = d_path(&path, buf, len); | |
13346 | + if (IS_ERR(p)) | |
13347 | + goto out; | |
13348 | + if (n != 1) | |
13349 | + p += n; | |
13350 | + | |
13351 | + path.mnt = au_mnt_get(sb); | |
13352 | + path.dentry = sb->s_root; | |
13353 | + p = d_path(&path, buf, len - strlen(p)); | |
13354 | + mntput(path.mnt); | |
13355 | + if (IS_ERR(p)) | |
13356 | + goto out; | |
13357 | + if (n != 1) | |
13358 | + p[strlen(p)] = '/'; | |
13359 | + | |
4f0767ce | 13360 | +out: |
1facf9fc | 13361 | + AuTraceErrPtr(p); |
13362 | + return p; | |
13363 | +} | |
13364 | + | |
13365 | +static | |
027c5e7a AM |
13366 | +struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh, |
13367 | + int fh_len, struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 13368 | +{ |
13369 | + struct dentry *dentry, *h_parent, *root; | |
13370 | + struct super_block *h_sb; | |
13371 | + char *pathname, *p; | |
13372 | + struct vfsmount *h_mnt; | |
13373 | + struct au_branch *br; | |
13374 | + int err; | |
13375 | + struct path path; | |
13376 | + | |
027c5e7a | 13377 | + br = au_sbr(sb, nsi_lock->bindex); |
86dc4139 | 13378 | + h_mnt = au_br_mnt(br); |
1facf9fc | 13379 | + h_sb = h_mnt->mnt_sb; |
13380 | + /* todo: call lower fh_to_dentry()? fh_to_parent()? */ | |
5afbbe0d | 13381 | + lockdep_off(); |
1facf9fc | 13382 | + h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail), |
13383 | + fh_len - Fh_tail, fh[Fh_h_type], | |
13384 | + h_acceptable, /*context*/NULL); | |
5afbbe0d | 13385 | + lockdep_on(); |
1facf9fc | 13386 | + dentry = h_parent; |
13387 | + if (unlikely(!h_parent || IS_ERR(h_parent))) { | |
13388 | + AuWarn1("%s decode_fh failed, %ld\n", | |
13389 | + au_sbtype(h_sb), PTR_ERR(h_parent)); | |
13390 | + goto out; | |
13391 | + } | |
13392 | + dentry = NULL; | |
13393 | + if (unlikely(au_test_anon(h_parent))) { | |
13394 | + AuWarn1("%s decode_fh returned a disconnected dentry\n", | |
13395 | + au_sbtype(h_sb)); | |
13396 | + goto out_h_parent; | |
13397 | + } | |
13398 | + | |
13399 | + dentry = ERR_PTR(-ENOMEM); | |
13400 | + pathname = (void *)__get_free_page(GFP_NOFS); | |
13401 | + if (unlikely(!pathname)) | |
13402 | + goto out_h_parent; | |
13403 | + | |
13404 | + root = sb->s_root; | |
13405 | + path.mnt = h_mnt; | |
13406 | + di_read_lock_parent(root, !AuLock_IR); | |
027c5e7a | 13407 | + path.dentry = au_h_dptr(root, nsi_lock->bindex); |
1facf9fc | 13408 | + di_read_unlock(root, !AuLock_IR); |
13409 | + p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb); | |
13410 | + dentry = (void *)p; | |
13411 | + if (IS_ERR(p)) | |
13412 | + goto out_pathname; | |
13413 | + | |
13414 | + si_read_unlock(sb); | |
13415 | + err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); | |
13416 | + dentry = ERR_PTR(err); | |
13417 | + if (unlikely(err)) | |
13418 | + goto out_relock; | |
13419 | + | |
13420 | + dentry = ERR_PTR(-ENOENT); | |
13421 | + AuDebugOn(au_test_anon(path.dentry)); | |
5527c038 | 13422 | + if (unlikely(d_really_is_negative(path.dentry))) |
1facf9fc | 13423 | + goto out_path; |
13424 | + | |
5527c038 | 13425 | + if (ino != d_inode(path.dentry)->i_ino) |
1facf9fc | 13426 | + dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL); |
13427 | + else | |
13428 | + dentry = dget(path.dentry); | |
13429 | + | |
4f0767ce | 13430 | +out_path: |
1facf9fc | 13431 | + path_put(&path); |
4f0767ce | 13432 | +out_relock: |
1facf9fc | 13433 | + if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0)) |
13434 | + if (!IS_ERR(dentry)) { | |
13435 | + dput(dentry); | |
13436 | + dentry = ERR_PTR(-ESTALE); | |
13437 | + } | |
4f0767ce | 13438 | +out_pathname: |
1c60b727 | 13439 | + free_page((unsigned long)pathname); |
4f0767ce | 13440 | +out_h_parent: |
1facf9fc | 13441 | + dput(h_parent); |
4f0767ce | 13442 | +out: |
1facf9fc | 13443 | + AuTraceErrPtr(dentry); |
13444 | + return dentry; | |
13445 | +} | |
13446 | + | |
13447 | +/* ---------------------------------------------------------------------- */ | |
13448 | + | |
13449 | +static struct dentry * | |
13450 | +aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
13451 | + int fh_type) | |
13452 | +{ | |
13453 | + struct dentry *dentry; | |
13454 | + __u32 *fh = fid->raw; | |
027c5e7a | 13455 | + struct au_branch *br; |
1facf9fc | 13456 | + ino_t ino, dir_ino; |
1facf9fc | 13457 | + struct au_nfsd_si_lock nsi_lock = { |
1facf9fc | 13458 | + .force_lock = 0 |
13459 | + }; | |
13460 | + | |
1facf9fc | 13461 | + dentry = ERR_PTR(-ESTALE); |
4a4d8108 AM |
13462 | + /* it should never happen, but the file handle is unreliable */ |
13463 | + if (unlikely(fh_len < Fh_tail)) | |
13464 | + goto out; | |
13465 | + nsi_lock.sigen = fh[Fh_sigen]; | |
13466 | + nsi_lock.br_id = fh[Fh_br_id]; | |
13467 | + | |
1facf9fc | 13468 | + /* branch id may be wrapped around */ |
027c5e7a AM |
13469 | + br = NULL; |
13470 | + if (unlikely(si_nfsd_read_lock(sb, &nsi_lock))) | |
1facf9fc | 13471 | + goto out; |
13472 | + nsi_lock.force_lock = 1; | |
13473 | + | |
13474 | + /* is this inode still cached? */ | |
13475 | + ino = decode_ino(fh + Fh_ino); | |
4a4d8108 AM |
13476 | + /* it should never happen */ |
13477 | + if (unlikely(ino == AUFS_ROOT_INO)) | |
8cdd5066 | 13478 | + goto out_unlock; |
4a4d8108 | 13479 | + |
1facf9fc | 13480 | + dir_ino = decode_ino(fh + Fh_dir_ino); |
13481 | + dentry = decode_by_ino(sb, ino, dir_ino); | |
13482 | + if (IS_ERR(dentry)) | |
13483 | + goto out_unlock; | |
13484 | + if (dentry) | |
13485 | + goto accept; | |
13486 | + | |
13487 | + /* is the parent dir cached? */ | |
027c5e7a | 13488 | + br = au_sbr(sb, nsi_lock.bindex); |
acd2b654 | 13489 | + au_lcnt_inc(&br->br_nfiles); |
1facf9fc | 13490 | + dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock); |
13491 | + if (IS_ERR(dentry)) | |
13492 | + goto out_unlock; | |
13493 | + if (dentry) | |
13494 | + goto accept; | |
13495 | + | |
13496 | + /* lookup path */ | |
027c5e7a | 13497 | + dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock); |
1facf9fc | 13498 | + if (IS_ERR(dentry)) |
13499 | + goto out_unlock; | |
13500 | + if (unlikely(!dentry)) | |
13501 | + /* todo?: make it ESTALE */ | |
13502 | + goto out_unlock; | |
13503 | + | |
4f0767ce | 13504 | +accept: |
027c5e7a | 13505 | + if (!au_digen_test(dentry, au_sigen(sb)) |
5527c038 | 13506 | + && d_inode(dentry)->i_generation == fh[Fh_igen]) |
1facf9fc | 13507 | + goto out_unlock; /* success */ |
13508 | + | |
13509 | + dput(dentry); | |
13510 | + dentry = ERR_PTR(-ESTALE); | |
4f0767ce | 13511 | +out_unlock: |
027c5e7a | 13512 | + if (br) |
acd2b654 | 13513 | + au_lcnt_dec(&br->br_nfiles); |
1facf9fc | 13514 | + si_read_unlock(sb); |
4f0767ce | 13515 | +out: |
1facf9fc | 13516 | + AuTraceErrPtr(dentry); |
13517 | + return dentry; | |
13518 | +} | |
13519 | + | |
13520 | +#if 0 /* reserved for future use */ | |
13521 | +/* support subtreecheck option */ | |
13522 | +static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
13523 | + int fh_len, int fh_type) | |
13524 | +{ | |
13525 | + struct dentry *parent; | |
13526 | + __u32 *fh = fid->raw; | |
13527 | + ino_t dir_ino; | |
13528 | + | |
13529 | + dir_ino = decode_ino(fh + Fh_dir_ino); | |
13530 | + parent = decode_by_ino(sb, dir_ino, 0); | |
13531 | + if (IS_ERR(parent)) | |
13532 | + goto out; | |
13533 | + if (!parent) | |
13534 | + parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]), | |
13535 | + dir_ino, fh, fh_len); | |
13536 | + | |
4f0767ce | 13537 | +out: |
1facf9fc | 13538 | + AuTraceErrPtr(parent); |
13539 | + return parent; | |
13540 | +} | |
13541 | +#endif | |
13542 | + | |
13543 | +/* ---------------------------------------------------------------------- */ | |
13544 | + | |
0c3ec466 AM |
13545 | +static int aufs_encode_fh(struct inode *inode, __u32 *fh, int *max_len, |
13546 | + struct inode *dir) | |
1facf9fc | 13547 | +{ |
13548 | + int err; | |
0c3ec466 | 13549 | + aufs_bindex_t bindex; |
1facf9fc | 13550 | + struct super_block *sb, *h_sb; |
0c3ec466 AM |
13551 | + struct dentry *dentry, *parent, *h_parent; |
13552 | + struct inode *h_dir; | |
1facf9fc | 13553 | + struct au_branch *br; |
13554 | + | |
1facf9fc | 13555 | + err = -ENOSPC; |
13556 | + if (unlikely(*max_len <= Fh_tail)) { | |
13557 | + AuWarn1("NFSv2 client (max_len %d)?\n", *max_len); | |
13558 | + goto out; | |
13559 | + } | |
13560 | + | |
13561 | + err = FILEID_ROOT; | |
0c3ec466 AM |
13562 | + if (inode->i_ino == AUFS_ROOT_INO) { |
13563 | + AuDebugOn(inode->i_ino != AUFS_ROOT_INO); | |
1facf9fc | 13564 | + goto out; |
13565 | + } | |
13566 | + | |
1facf9fc | 13567 | + h_parent = NULL; |
0c3ec466 AM |
13568 | + sb = inode->i_sb; |
13569 | + err = si_read_lock(sb, AuLock_FLUSH); | |
027c5e7a AM |
13570 | + if (unlikely(err)) |
13571 | + goto out; | |
13572 | + | |
1facf9fc | 13573 | +#ifdef CONFIG_AUFS_DEBUG |
13574 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) | |
13575 | + AuWarn1("NFS-exporting requires xino\n"); | |
13576 | +#endif | |
027c5e7a | 13577 | + err = -EIO; |
0c3ec466 AM |
13578 | + parent = NULL; |
13579 | + ii_read_lock_child(inode); | |
5afbbe0d | 13580 | + bindex = au_ibtop(inode); |
0c3ec466 | 13581 | + if (!dir) { |
c1595e42 | 13582 | + dentry = d_find_any_alias(inode); |
0c3ec466 AM |
13583 | + if (unlikely(!dentry)) |
13584 | + goto out_unlock; | |
13585 | + AuDebugOn(au_test_anon(dentry)); | |
13586 | + parent = dget_parent(dentry); | |
13587 | + dput(dentry); | |
13588 | + if (unlikely(!parent)) | |
13589 | + goto out_unlock; | |
5527c038 JR |
13590 | + if (d_really_is_positive(parent)) |
13591 | + dir = d_inode(parent); | |
1facf9fc | 13592 | + } |
0c3ec466 AM |
13593 | + |
13594 | + ii_read_lock_parent(dir); | |
13595 | + h_dir = au_h_iptr(dir, bindex); | |
13596 | + ii_read_unlock(dir); | |
13597 | + if (unlikely(!h_dir)) | |
13598 | + goto out_parent; | |
c1595e42 | 13599 | + h_parent = d_find_any_alias(h_dir); |
1facf9fc | 13600 | + if (unlikely(!h_parent)) |
0c3ec466 | 13601 | + goto out_hparent; |
1facf9fc | 13602 | + |
13603 | + err = -EPERM; | |
13604 | + br = au_sbr(sb, bindex); | |
86dc4139 | 13605 | + h_sb = au_br_sb(br); |
1facf9fc | 13606 | + if (unlikely(!h_sb->s_export_op)) { |
13607 | + AuErr1("%s branch is not exportable\n", au_sbtype(h_sb)); | |
0c3ec466 | 13608 | + goto out_hparent; |
1facf9fc | 13609 | + } |
13610 | + | |
13611 | + fh[Fh_br_id] = br->br_id; | |
13612 | + fh[Fh_sigen] = au_sigen(sb); | |
13613 | + encode_ino(fh + Fh_ino, inode->i_ino); | |
0c3ec466 | 13614 | + encode_ino(fh + Fh_dir_ino, dir->i_ino); |
1facf9fc | 13615 | + fh[Fh_igen] = inode->i_generation; |
13616 | + | |
13617 | + *max_len -= Fh_tail; | |
13618 | + fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail), | |
13619 | + max_len, | |
13620 | + /*connectable or subtreecheck*/0); | |
13621 | + err = fh[Fh_h_type]; | |
13622 | + *max_len += Fh_tail; | |
13623 | + /* todo: macros? */ | |
1716fcea | 13624 | + if (err != FILEID_INVALID) |
1facf9fc | 13625 | + err = 99; |
13626 | + else | |
13627 | + AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb)); | |
13628 | + | |
0c3ec466 | 13629 | +out_hparent: |
1facf9fc | 13630 | + dput(h_parent); |
0c3ec466 | 13631 | +out_parent: |
1facf9fc | 13632 | + dput(parent); |
0c3ec466 AM |
13633 | +out_unlock: |
13634 | + ii_read_unlock(inode); | |
13635 | + si_read_unlock(sb); | |
4f0767ce | 13636 | +out: |
1facf9fc | 13637 | + if (unlikely(err < 0)) |
1716fcea | 13638 | + err = FILEID_INVALID; |
1facf9fc | 13639 | + return err; |
13640 | +} | |
13641 | + | |
13642 | +/* ---------------------------------------------------------------------- */ | |
13643 | + | |
4a4d8108 AM |
13644 | +static int aufs_commit_metadata(struct inode *inode) |
13645 | +{ | |
13646 | + int err; | |
13647 | + aufs_bindex_t bindex; | |
13648 | + struct super_block *sb; | |
13649 | + struct inode *h_inode; | |
13650 | + int (*f)(struct inode *inode); | |
13651 | + | |
13652 | + sb = inode->i_sb; | |
e49829fe | 13653 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 | 13654 | + ii_write_lock_child(inode); |
5afbbe0d | 13655 | + bindex = au_ibtop(inode); |
4a4d8108 AM |
13656 | + AuDebugOn(bindex < 0); |
13657 | + h_inode = au_h_iptr(inode, bindex); | |
13658 | + | |
13659 | + f = h_inode->i_sb->s_export_op->commit_metadata; | |
13660 | + if (f) | |
13661 | + err = f(h_inode); | |
13662 | + else { | |
13663 | + struct writeback_control wbc = { | |
13664 | + .sync_mode = WB_SYNC_ALL, | |
13665 | + .nr_to_write = 0 /* metadata only */ | |
13666 | + }; | |
13667 | + | |
13668 | + err = sync_inode(h_inode, &wbc); | |
13669 | + } | |
13670 | + | |
13671 | + au_cpup_attr_timesizes(inode); | |
13672 | + ii_write_unlock(inode); | |
13673 | + si_read_unlock(sb); | |
13674 | + return err; | |
13675 | +} | |
13676 | + | |
13677 | +/* ---------------------------------------------------------------------- */ | |
13678 | + | |
1facf9fc | 13679 | +static struct export_operations aufs_export_op = { |
4a4d8108 | 13680 | + .fh_to_dentry = aufs_fh_to_dentry, |
1facf9fc | 13681 | + /* .fh_to_parent = aufs_fh_to_parent, */ |
4a4d8108 AM |
13682 | + .encode_fh = aufs_encode_fh, |
13683 | + .commit_metadata = aufs_commit_metadata | |
1facf9fc | 13684 | +}; |
13685 | + | |
13686 | +void au_export_init(struct super_block *sb) | |
13687 | +{ | |
13688 | + struct au_sbinfo *sbinfo; | |
13689 | + __u32 u; | |
13690 | + | |
5afbbe0d AM |
13691 | + BUILD_BUG_ON_MSG(IS_BUILTIN(CONFIG_AUFS_FS) |
13692 | + && IS_MODULE(CONFIG_EXPORTFS), | |
13693 | + AUFS_NAME ": unsupported configuration " | |
13694 | + "CONFIG_EXPORTFS=m and CONFIG_AUFS_FS=y"); | |
13695 | + | |
1facf9fc | 13696 | + sb->s_export_op = &aufs_export_op; |
13697 | + sbinfo = au_sbi(sb); | |
13698 | + sbinfo->si_xigen = NULL; | |
13699 | + get_random_bytes(&u, sizeof(u)); | |
13700 | + BUILD_BUG_ON(sizeof(u) != sizeof(int)); | |
13701 | + atomic_set(&sbinfo->si_xigen_next, u); | |
13702 | +} | |
076b876e | 13703 | diff -urN /usr/share/empty/fs/aufs/fhsm.c linux/fs/aufs/fhsm.c |
eca34b5c | 13704 | --- /usr/share/empty/fs/aufs/fhsm.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 13705 | +++ linux/fs/aufs/fhsm.c 2020-01-27 10:57:18.172204883 +0100 |
062440b3 | 13706 | @@ -0,0 +1,427 @@ |
cd7a4cd9 | 13707 | +// SPDX-License-Identifier: GPL-2.0 |
076b876e | 13708 | +/* |
016522bc | 13709 | + * Copyright (C) 2011-2020 Junjiro R. Okajima |
076b876e AM |
13710 | + * |
13711 | + * This program, aufs is free software; you can redistribute it and/or modify | |
13712 | + * it under the terms of the GNU General Public License as published by | |
13713 | + * the Free Software Foundation; either version 2 of the License, or | |
13714 | + * (at your option) any later version. | |
13715 | + * | |
13716 | + * This program is distributed in the hope that it will be useful, | |
13717 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13718 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13719 | + * GNU General Public License for more details. | |
13720 | + * | |
13721 | + * You should have received a copy of the GNU General Public License | |
13722 | + * along with this program; if not, write to the Free Software | |
13723 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
13724 | + */ | |
13725 | + | |
13726 | +/* | |
13727 | + * File-based Hierarchy Storage Management | |
13728 | + */ | |
13729 | + | |
13730 | +#include <linux/anon_inodes.h> | |
13731 | +#include <linux/poll.h> | |
13732 | +#include <linux/seq_file.h> | |
13733 | +#include <linux/statfs.h> | |
13734 | +#include "aufs.h" | |
13735 | + | |
c1595e42 JR |
13736 | +static aufs_bindex_t au_fhsm_bottom(struct super_block *sb) |
13737 | +{ | |
13738 | + struct au_sbinfo *sbinfo; | |
13739 | + struct au_fhsm *fhsm; | |
13740 | + | |
13741 | + SiMustAnyLock(sb); | |
13742 | + | |
13743 | + sbinfo = au_sbi(sb); | |
13744 | + fhsm = &sbinfo->si_fhsm; | |
13745 | + AuDebugOn(!fhsm); | |
13746 | + return fhsm->fhsm_bottom; | |
13747 | +} | |
13748 | + | |
13749 | +void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex) | |
13750 | +{ | |
13751 | + struct au_sbinfo *sbinfo; | |
13752 | + struct au_fhsm *fhsm; | |
13753 | + | |
13754 | + SiMustWriteLock(sb); | |
13755 | + | |
13756 | + sbinfo = au_sbi(sb); | |
13757 | + fhsm = &sbinfo->si_fhsm; | |
13758 | + AuDebugOn(!fhsm); | |
13759 | + fhsm->fhsm_bottom = bindex; | |
13760 | +} | |
13761 | + | |
13762 | +/* ---------------------------------------------------------------------- */ | |
13763 | + | |
076b876e AM |
13764 | +static int au_fhsm_test_jiffy(struct au_sbinfo *sbinfo, struct au_branch *br) |
13765 | +{ | |
13766 | + struct au_br_fhsm *bf; | |
13767 | + | |
13768 | + bf = br->br_fhsm; | |
13769 | + MtxMustLock(&bf->bf_lock); | |
13770 | + | |
13771 | + return !bf->bf_readable | |
13772 | + || time_after(jiffies, | |
13773 | + bf->bf_jiffy + sbinfo->si_fhsm.fhsm_expire); | |
13774 | +} | |
13775 | + | |
13776 | +/* ---------------------------------------------------------------------- */ | |
13777 | + | |
13778 | +static void au_fhsm_notify(struct super_block *sb, int val) | |
13779 | +{ | |
13780 | + struct au_sbinfo *sbinfo; | |
13781 | + struct au_fhsm *fhsm; | |
13782 | + | |
13783 | + SiMustAnyLock(sb); | |
13784 | + | |
13785 | + sbinfo = au_sbi(sb); | |
13786 | + fhsm = &sbinfo->si_fhsm; | |
13787 | + if (au_fhsm_pid(fhsm) | |
13788 | + && atomic_read(&fhsm->fhsm_readable) != -1) { | |
13789 | + atomic_set(&fhsm->fhsm_readable, val); | |
13790 | + if (val) | |
13791 | + wake_up(&fhsm->fhsm_wqh); | |
13792 | + } | |
13793 | +} | |
13794 | + | |
13795 | +static int au_fhsm_stfs(struct super_block *sb, aufs_bindex_t bindex, | |
13796 | + struct aufs_stfs *rstfs, int do_lock, int do_notify) | |
13797 | +{ | |
13798 | + int err; | |
13799 | + struct au_branch *br; | |
13800 | + struct au_br_fhsm *bf; | |
13801 | + | |
13802 | + br = au_sbr(sb, bindex); | |
13803 | + AuDebugOn(au_br_rdonly(br)); | |
13804 | + bf = br->br_fhsm; | |
13805 | + AuDebugOn(!bf); | |
13806 | + | |
13807 | + if (do_lock) | |
13808 | + mutex_lock(&bf->bf_lock); | |
13809 | + else | |
13810 | + MtxMustLock(&bf->bf_lock); | |
13811 | + | |
13812 | + /* sb->s_root for NFS is unreliable */ | |
13813 | + err = au_br_stfs(br, &bf->bf_stfs); | |
13814 | + if (unlikely(err)) { | |
13815 | + AuErr1("FHSM failed (%d), b%d, ignored.\n", bindex, err); | |
13816 | + goto out; | |
13817 | + } | |
13818 | + | |
13819 | + bf->bf_jiffy = jiffies; | |
13820 | + bf->bf_readable = 1; | |
13821 | + if (do_notify) | |
13822 | + au_fhsm_notify(sb, /*val*/1); | |
13823 | + if (rstfs) | |
13824 | + *rstfs = bf->bf_stfs; | |
13825 | + | |
13826 | +out: | |
13827 | + if (do_lock) | |
13828 | + mutex_unlock(&bf->bf_lock); | |
13829 | + au_fhsm_notify(sb, /*val*/1); | |
13830 | + | |
13831 | + return err; | |
13832 | +} | |
13833 | + | |
13834 | +void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force) | |
13835 | +{ | |
13836 | + int err; | |
076b876e AM |
13837 | + struct au_sbinfo *sbinfo; |
13838 | + struct au_fhsm *fhsm; | |
13839 | + struct au_branch *br; | |
13840 | + struct au_br_fhsm *bf; | |
13841 | + | |
13842 | + AuDbg("b%d, force %d\n", bindex, force); | |
13843 | + SiMustAnyLock(sb); | |
13844 | + | |
13845 | + sbinfo = au_sbi(sb); | |
13846 | + fhsm = &sbinfo->si_fhsm; | |
c1595e42 JR |
13847 | + if (!au_ftest_si(sbinfo, FHSM) |
13848 | + || fhsm->fhsm_bottom == bindex) | |
076b876e AM |
13849 | + return; |
13850 | + | |
13851 | + br = au_sbr(sb, bindex); | |
13852 | + bf = br->br_fhsm; | |
13853 | + AuDebugOn(!bf); | |
13854 | + mutex_lock(&bf->bf_lock); | |
13855 | + if (force | |
13856 | + || au_fhsm_pid(fhsm) | |
13857 | + || au_fhsm_test_jiffy(sbinfo, br)) | |
13858 | + err = au_fhsm_stfs(sb, bindex, /*rstfs*/NULL, /*do_lock*/0, | |
13859 | + /*do_notify*/1); | |
13860 | + mutex_unlock(&bf->bf_lock); | |
13861 | +} | |
13862 | + | |
13863 | +void au_fhsm_wrote_all(struct super_block *sb, int force) | |
13864 | +{ | |
5afbbe0d | 13865 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
13866 | + struct au_branch *br; |
13867 | + | |
13868 | + /* exclude the bottom */ | |
5afbbe0d AM |
13869 | + bbot = au_fhsm_bottom(sb); |
13870 | + for (bindex = 0; bindex < bbot; bindex++) { | |
076b876e AM |
13871 | + br = au_sbr(sb, bindex); |
13872 | + if (au_br_fhsm(br->br_perm)) | |
13873 | + au_fhsm_wrote(sb, bindex, force); | |
13874 | + } | |
13875 | +} | |
13876 | + | |
13877 | +/* ---------------------------------------------------------------------- */ | |
13878 | + | |
be118d29 | 13879 | +static __poll_t au_fhsm_poll(struct file *file, struct poll_table_struct *wait) |
076b876e | 13880 | +{ |
be118d29 | 13881 | + __poll_t mask; |
076b876e AM |
13882 | + struct au_sbinfo *sbinfo; |
13883 | + struct au_fhsm *fhsm; | |
13884 | + | |
13885 | + mask = 0; | |
13886 | + sbinfo = file->private_data; | |
13887 | + fhsm = &sbinfo->si_fhsm; | |
13888 | + poll_wait(file, &fhsm->fhsm_wqh, wait); | |
13889 | + if (atomic_read(&fhsm->fhsm_readable)) | |
be118d29 | 13890 | + mask = EPOLLIN /* | EPOLLRDNORM */; |
076b876e | 13891 | + |
b00004a5 AM |
13892 | + if (!mask) |
13893 | + AuDbg("mask 0x%x\n", mask); | |
076b876e AM |
13894 | + return mask; |
13895 | +} | |
13896 | + | |
13897 | +static int au_fhsm_do_read_one(struct aufs_stbr __user *stbr, | |
13898 | + struct aufs_stfs *stfs, __s16 brid) | |
13899 | +{ | |
13900 | + int err; | |
13901 | + | |
13902 | + err = copy_to_user(&stbr->stfs, stfs, sizeof(*stfs)); | |
13903 | + if (!err) | |
13904 | + err = __put_user(brid, &stbr->brid); | |
13905 | + if (unlikely(err)) | |
13906 | + err = -EFAULT; | |
13907 | + | |
13908 | + return err; | |
13909 | +} | |
13910 | + | |
13911 | +static ssize_t au_fhsm_do_read(struct super_block *sb, | |
13912 | + struct aufs_stbr __user *stbr, size_t count) | |
13913 | +{ | |
13914 | + ssize_t err; | |
13915 | + int nstbr; | |
5afbbe0d | 13916 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
13917 | + struct au_branch *br; |
13918 | + struct au_br_fhsm *bf; | |
13919 | + | |
13920 | + /* except the bottom branch */ | |
13921 | + err = 0; | |
13922 | + nstbr = 0; | |
5afbbe0d AM |
13923 | + bbot = au_fhsm_bottom(sb); |
13924 | + for (bindex = 0; !err && bindex < bbot; bindex++) { | |
076b876e AM |
13925 | + br = au_sbr(sb, bindex); |
13926 | + if (!au_br_fhsm(br->br_perm)) | |
13927 | + continue; | |
13928 | + | |
13929 | + bf = br->br_fhsm; | |
13930 | + mutex_lock(&bf->bf_lock); | |
13931 | + if (bf->bf_readable) { | |
13932 | + err = -EFAULT; | |
13933 | + if (count >= sizeof(*stbr)) | |
13934 | + err = au_fhsm_do_read_one(stbr++, &bf->bf_stfs, | |
13935 | + br->br_id); | |
13936 | + if (!err) { | |
13937 | + bf->bf_readable = 0; | |
13938 | + count -= sizeof(*stbr); | |
13939 | + nstbr++; | |
13940 | + } | |
13941 | + } | |
13942 | + mutex_unlock(&bf->bf_lock); | |
13943 | + } | |
13944 | + if (!err) | |
13945 | + err = sizeof(*stbr) * nstbr; | |
13946 | + | |
13947 | + return err; | |
13948 | +} | |
13949 | + | |
13950 | +static ssize_t au_fhsm_read(struct file *file, char __user *buf, size_t count, | |
13951 | + loff_t *pos) | |
13952 | +{ | |
13953 | + ssize_t err; | |
13954 | + int readable; | |
5afbbe0d | 13955 | + aufs_bindex_t nfhsm, bindex, bbot; |
076b876e AM |
13956 | + struct au_sbinfo *sbinfo; |
13957 | + struct au_fhsm *fhsm; | |
13958 | + struct au_branch *br; | |
13959 | + struct super_block *sb; | |
13960 | + | |
13961 | + err = 0; | |
13962 | + sbinfo = file->private_data; | |
13963 | + fhsm = &sbinfo->si_fhsm; | |
13964 | +need_data: | |
13965 | + spin_lock_irq(&fhsm->fhsm_wqh.lock); | |
13966 | + if (!atomic_read(&fhsm->fhsm_readable)) { | |
13967 | + if (vfsub_file_flags(file) & O_NONBLOCK) | |
13968 | + err = -EAGAIN; | |
13969 | + else | |
13970 | + err = wait_event_interruptible_locked_irq | |
13971 | + (fhsm->fhsm_wqh, | |
13972 | + atomic_read(&fhsm->fhsm_readable)); | |
13973 | + } | |
13974 | + spin_unlock_irq(&fhsm->fhsm_wqh.lock); | |
13975 | + if (unlikely(err)) | |
13976 | + goto out; | |
13977 | + | |
13978 | + /* sb may already be dead */ | |
13979 | + au_rw_read_lock(&sbinfo->si_rwsem); | |
13980 | + readable = atomic_read(&fhsm->fhsm_readable); | |
13981 | + if (readable > 0) { | |
13982 | + sb = sbinfo->si_sb; | |
13983 | + AuDebugOn(!sb); | |
13984 | + /* exclude the bottom branch */ | |
13985 | + nfhsm = 0; | |
5afbbe0d AM |
13986 | + bbot = au_fhsm_bottom(sb); |
13987 | + for (bindex = 0; bindex < bbot; bindex++) { | |
076b876e AM |
13988 | + br = au_sbr(sb, bindex); |
13989 | + if (au_br_fhsm(br->br_perm)) | |
13990 | + nfhsm++; | |
13991 | + } | |
13992 | + err = -EMSGSIZE; | |
13993 | + if (nfhsm * sizeof(struct aufs_stbr) <= count) { | |
13994 | + atomic_set(&fhsm->fhsm_readable, 0); | |
13995 | + err = au_fhsm_do_read(sbinfo->si_sb, (void __user *)buf, | |
13996 | + count); | |
13997 | + } | |
13998 | + } | |
13999 | + au_rw_read_unlock(&sbinfo->si_rwsem); | |
14000 | + if (!readable) | |
14001 | + goto need_data; | |
14002 | + | |
14003 | +out: | |
14004 | + return err; | |
14005 | +} | |
14006 | + | |
14007 | +static int au_fhsm_release(struct inode *inode, struct file *file) | |
14008 | +{ | |
14009 | + struct au_sbinfo *sbinfo; | |
14010 | + struct au_fhsm *fhsm; | |
14011 | + | |
14012 | + /* sb may already be dead */ | |
14013 | + sbinfo = file->private_data; | |
14014 | + fhsm = &sbinfo->si_fhsm; | |
14015 | + spin_lock(&fhsm->fhsm_spin); | |
14016 | + fhsm->fhsm_pid = 0; | |
14017 | + spin_unlock(&fhsm->fhsm_spin); | |
14018 | + kobject_put(&sbinfo->si_kobj); | |
14019 | + | |
14020 | + return 0; | |
14021 | +} | |
14022 | + | |
14023 | +static const struct file_operations au_fhsm_fops = { | |
14024 | + .owner = THIS_MODULE, | |
14025 | + .llseek = noop_llseek, | |
14026 | + .read = au_fhsm_read, | |
14027 | + .poll = au_fhsm_poll, | |
14028 | + .release = au_fhsm_release | |
14029 | +}; | |
14030 | + | |
14031 | +int au_fhsm_fd(struct super_block *sb, int oflags) | |
14032 | +{ | |
14033 | + int err, fd; | |
14034 | + struct au_sbinfo *sbinfo; | |
14035 | + struct au_fhsm *fhsm; | |
14036 | + | |
14037 | + err = -EPERM; | |
14038 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
14039 | + goto out; | |
14040 | + | |
14041 | + err = -EINVAL; | |
14042 | + if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK))) | |
14043 | + goto out; | |
14044 | + | |
14045 | + err = 0; | |
14046 | + sbinfo = au_sbi(sb); | |
14047 | + fhsm = &sbinfo->si_fhsm; | |
14048 | + spin_lock(&fhsm->fhsm_spin); | |
14049 | + if (!fhsm->fhsm_pid) | |
14050 | + fhsm->fhsm_pid = current->pid; | |
14051 | + else | |
14052 | + err = -EBUSY; | |
14053 | + spin_unlock(&fhsm->fhsm_spin); | |
14054 | + if (unlikely(err)) | |
14055 | + goto out; | |
14056 | + | |
14057 | + oflags |= O_RDONLY; | |
14058 | + /* oflags |= FMODE_NONOTIFY; */ | |
14059 | + fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags); | |
14060 | + err = fd; | |
14061 | + if (unlikely(fd < 0)) | |
14062 | + goto out_pid; | |
14063 | + | |
acd2b654 | 14064 | + /* succeed regardless 'fhsm' status */ |
076b876e AM |
14065 | + kobject_get(&sbinfo->si_kobj); |
14066 | + si_noflush_read_lock(sb); | |
14067 | + if (au_ftest_si(sbinfo, FHSM)) | |
14068 | + au_fhsm_wrote_all(sb, /*force*/0); | |
14069 | + si_read_unlock(sb); | |
14070 | + goto out; /* success */ | |
14071 | + | |
14072 | +out_pid: | |
14073 | + spin_lock(&fhsm->fhsm_spin); | |
14074 | + fhsm->fhsm_pid = 0; | |
14075 | + spin_unlock(&fhsm->fhsm_spin); | |
14076 | +out: | |
14077 | + AuTraceErr(err); | |
14078 | + return err; | |
14079 | +} | |
14080 | + | |
14081 | +/* ---------------------------------------------------------------------- */ | |
14082 | + | |
14083 | +int au_fhsm_br_alloc(struct au_branch *br) | |
14084 | +{ | |
14085 | + int err; | |
14086 | + | |
14087 | + err = 0; | |
14088 | + br->br_fhsm = kmalloc(sizeof(*br->br_fhsm), GFP_NOFS); | |
14089 | + if (br->br_fhsm) | |
14090 | + au_br_fhsm_init(br->br_fhsm); | |
14091 | + else | |
14092 | + err = -ENOMEM; | |
14093 | + | |
14094 | + return err; | |
14095 | +} | |
14096 | + | |
14097 | +/* ---------------------------------------------------------------------- */ | |
14098 | + | |
14099 | +void au_fhsm_fin(struct super_block *sb) | |
14100 | +{ | |
14101 | + au_fhsm_notify(sb, /*val*/-1); | |
14102 | +} | |
14103 | + | |
14104 | +void au_fhsm_init(struct au_sbinfo *sbinfo) | |
14105 | +{ | |
14106 | + struct au_fhsm *fhsm; | |
14107 | + | |
14108 | + fhsm = &sbinfo->si_fhsm; | |
14109 | + spin_lock_init(&fhsm->fhsm_spin); | |
14110 | + init_waitqueue_head(&fhsm->fhsm_wqh); | |
14111 | + atomic_set(&fhsm->fhsm_readable, 0); | |
14112 | + fhsm->fhsm_expire | |
14113 | + = msecs_to_jiffies(AUFS_FHSM_CACHE_DEF_SEC * MSEC_PER_SEC); | |
c1595e42 | 14114 | + fhsm->fhsm_bottom = -1; |
076b876e AM |
14115 | +} |
14116 | + | |
14117 | +void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec) | |
14118 | +{ | |
14119 | + sbinfo->si_fhsm.fhsm_expire | |
14120 | + = msecs_to_jiffies(sec * MSEC_PER_SEC); | |
14121 | +} | |
14122 | + | |
14123 | +void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo) | |
14124 | +{ | |
14125 | + unsigned int u; | |
14126 | + | |
14127 | + if (!au_ftest_si(sbinfo, FHSM)) | |
14128 | + return; | |
14129 | + | |
14130 | + u = jiffies_to_msecs(sbinfo->si_fhsm.fhsm_expire) / MSEC_PER_SEC; | |
14131 | + if (u != AUFS_FHSM_CACHE_DEF_SEC) | |
14132 | + seq_printf(seq, ",fhsm_sec=%u", u); | |
14133 | +} | |
7f207e10 | 14134 | diff -urN /usr/share/empty/fs/aufs/file.c linux/fs/aufs/file.c |
eca34b5c | 14135 | --- /usr/share/empty/fs/aufs/file.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 14136 | +++ linux/fs/aufs/file.c 2020-01-27 10:57:18.172204883 +0100 |
acd2b654 | 14137 | @@ -0,0 +1,863 @@ |
cd7a4cd9 | 14138 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 14139 | +/* |
016522bc | 14140 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 14141 | + * |
14142 | + * This program, aufs is free software; you can redistribute it and/or modify | |
14143 | + * it under the terms of the GNU General Public License as published by | |
14144 | + * the Free Software Foundation; either version 2 of the License, or | |
14145 | + * (at your option) any later version. | |
dece6358 AM |
14146 | + * |
14147 | + * This program is distributed in the hope that it will be useful, | |
14148 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14149 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14150 | + * GNU General Public License for more details. | |
14151 | + * | |
14152 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 14153 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 14154 | + */ |
14155 | + | |
14156 | +/* | |
4a4d8108 | 14157 | + * handling file/dir, and address_space operation |
1facf9fc | 14158 | + */ |
14159 | + | |
7eafdf33 AM |
14160 | +#ifdef CONFIG_AUFS_DEBUG |
14161 | +#include <linux/migrate.h> | |
14162 | +#endif | |
4a4d8108 | 14163 | +#include <linux/pagemap.h> |
1facf9fc | 14164 | +#include "aufs.h" |
14165 | + | |
4a4d8108 AM |
14166 | +/* drop flags for writing */ |
14167 | +unsigned int au_file_roflags(unsigned int flags) | |
14168 | +{ | |
14169 | + flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC); | |
14170 | + flags |= O_RDONLY | O_NOATIME; | |
14171 | + return flags; | |
14172 | +} | |
14173 | + | |
14174 | +/* common functions to regular file and dir */ | |
14175 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
392086de | 14176 | + struct file *file, int force_wr) |
1facf9fc | 14177 | +{ |
1308ab2a | 14178 | + struct file *h_file; |
4a4d8108 AM |
14179 | + struct dentry *h_dentry; |
14180 | + struct inode *h_inode; | |
14181 | + struct super_block *sb; | |
14182 | + struct au_branch *br; | |
14183 | + struct path h_path; | |
b912730e | 14184 | + int err; |
1facf9fc | 14185 | + |
4a4d8108 AM |
14186 | + /* a race condition can happen between open and unlink/rmdir */ |
14187 | + h_file = ERR_PTR(-ENOENT); | |
14188 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 14189 | + if (au_test_nfsd() && (!h_dentry || d_is_negative(h_dentry))) |
4a4d8108 | 14190 | + goto out; |
5527c038 | 14191 | + h_inode = d_inode(h_dentry); |
027c5e7a AM |
14192 | + spin_lock(&h_dentry->d_lock); |
14193 | + err = (!d_unhashed(dentry) && d_unlinked(h_dentry)) | |
5527c038 | 14194 | + /* || !d_inode(dentry)->i_nlink */ |
027c5e7a AM |
14195 | + ; |
14196 | + spin_unlock(&h_dentry->d_lock); | |
14197 | + if (unlikely(err)) | |
4a4d8108 | 14198 | + goto out; |
1facf9fc | 14199 | + |
4a4d8108 AM |
14200 | + sb = dentry->d_sb; |
14201 | + br = au_sbr(sb, bindex); | |
b912730e AM |
14202 | + err = au_br_test_oflag(flags, br); |
14203 | + h_file = ERR_PTR(err); | |
14204 | + if (unlikely(err)) | |
027c5e7a | 14205 | + goto out; |
1facf9fc | 14206 | + |
4a4d8108 | 14207 | + /* drop flags for writing */ |
5527c038 | 14208 | + if (au_test_ro(sb, bindex, d_inode(dentry))) { |
392086de AM |
14209 | + if (force_wr && !(flags & O_WRONLY)) |
14210 | + force_wr = 0; | |
4a4d8108 | 14211 | + flags = au_file_roflags(flags); |
392086de AM |
14212 | + if (force_wr) { |
14213 | + h_file = ERR_PTR(-EROFS); | |
14214 | + flags = au_file_roflags(flags); | |
14215 | + if (unlikely(vfsub_native_ro(h_inode) | |
14216 | + || IS_APPEND(h_inode))) | |
14217 | + goto out; | |
14218 | + flags &= ~O_ACCMODE; | |
14219 | + flags |= O_WRONLY; | |
14220 | + } | |
14221 | + } | |
4a4d8108 | 14222 | + flags &= ~O_CREAT; |
acd2b654 | 14223 | + au_lcnt_inc(&br->br_nfiles); |
4a4d8108 | 14224 | + h_path.dentry = h_dentry; |
86dc4139 | 14225 | + h_path.mnt = au_br_mnt(br); |
38d290e6 | 14226 | + h_file = vfsub_dentry_open(&h_path, flags); |
4a4d8108 AM |
14227 | + if (IS_ERR(h_file)) |
14228 | + goto out_br; | |
dece6358 | 14229 | + |
b912730e | 14230 | + if (flags & __FMODE_EXEC) { |
4a4d8108 AM |
14231 | + err = deny_write_access(h_file); |
14232 | + if (unlikely(err)) { | |
14233 | + fput(h_file); | |
14234 | + h_file = ERR_PTR(err); | |
14235 | + goto out_br; | |
14236 | + } | |
14237 | + } | |
953406b4 | 14238 | + fsnotify_open(h_file); |
4a4d8108 | 14239 | + goto out; /* success */ |
1facf9fc | 14240 | + |
4f0767ce | 14241 | +out_br: |
acd2b654 | 14242 | + au_lcnt_dec(&br->br_nfiles); |
4f0767ce | 14243 | +out: |
4a4d8108 AM |
14244 | + return h_file; |
14245 | +} | |
1308ab2a | 14246 | + |
076b876e AM |
14247 | +static int au_cmoo(struct dentry *dentry) |
14248 | +{ | |
8b6a4947 | 14249 | + int err, cmoo, matched; |
076b876e AM |
14250 | + unsigned int udba; |
14251 | + struct path h_path; | |
14252 | + struct au_pin pin; | |
14253 | + struct au_cp_generic cpg = { | |
14254 | + .dentry = dentry, | |
14255 | + .bdst = -1, | |
14256 | + .bsrc = -1, | |
14257 | + .len = -1, | |
14258 | + .pin = &pin, | |
14259 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
14260 | + }; | |
7e9cd9fe | 14261 | + struct inode *delegated; |
076b876e AM |
14262 | + struct super_block *sb; |
14263 | + struct au_sbinfo *sbinfo; | |
14264 | + struct au_fhsm *fhsm; | |
14265 | + pid_t pid; | |
14266 | + struct au_branch *br; | |
14267 | + struct dentry *parent; | |
14268 | + struct au_hinode *hdir; | |
14269 | + | |
14270 | + DiMustWriteLock(dentry); | |
5527c038 | 14271 | + IiMustWriteLock(d_inode(dentry)); |
076b876e AM |
14272 | + |
14273 | + err = 0; | |
14274 | + if (IS_ROOT(dentry)) | |
14275 | + goto out; | |
5afbbe0d | 14276 | + cpg.bsrc = au_dbtop(dentry); |
076b876e AM |
14277 | + if (!cpg.bsrc) |
14278 | + goto out; | |
14279 | + | |
14280 | + sb = dentry->d_sb; | |
14281 | + sbinfo = au_sbi(sb); | |
14282 | + fhsm = &sbinfo->si_fhsm; | |
14283 | + pid = au_fhsm_pid(fhsm); | |
8b6a4947 AM |
14284 | + rcu_read_lock(); |
14285 | + matched = (pid | |
14286 | + && (current->pid == pid | |
14287 | + || rcu_dereference(current->real_parent)->pid == pid)); | |
14288 | + rcu_read_unlock(); | |
14289 | + if (matched) | |
076b876e AM |
14290 | + goto out; |
14291 | + | |
14292 | + br = au_sbr(sb, cpg.bsrc); | |
14293 | + cmoo = au_br_cmoo(br->br_perm); | |
14294 | + if (!cmoo) | |
14295 | + goto out; | |
7e9cd9fe | 14296 | + if (!d_is_reg(dentry)) |
076b876e AM |
14297 | + cmoo &= AuBrAttr_COO_ALL; |
14298 | + if (!cmoo) | |
14299 | + goto out; | |
14300 | + | |
14301 | + parent = dget_parent(dentry); | |
14302 | + di_write_lock_parent(parent); | |
14303 | + err = au_wbr_do_copyup_bu(dentry, cpg.bsrc - 1); | |
14304 | + cpg.bdst = err; | |
14305 | + if (unlikely(err < 0)) { | |
14306 | + err = 0; /* there is no upper writable branch */ | |
14307 | + goto out_dgrade; | |
14308 | + } | |
14309 | + AuDbg("bsrc %d, bdst %d\n", cpg.bsrc, cpg.bdst); | |
14310 | + | |
14311 | + /* do not respect the coo attrib for the target branch */ | |
14312 | + err = au_cpup_dirs(dentry, cpg.bdst); | |
14313 | + if (unlikely(err)) | |
14314 | + goto out_dgrade; | |
14315 | + | |
14316 | + di_downgrade_lock(parent, AuLock_IR); | |
14317 | + udba = au_opt_udba(sb); | |
14318 | + err = au_pin(&pin, dentry, cpg.bdst, udba, | |
14319 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
14320 | + if (unlikely(err)) | |
14321 | + goto out_parent; | |
14322 | + | |
14323 | + err = au_sio_cpup_simple(&cpg); | |
14324 | + au_unpin(&pin); | |
14325 | + if (unlikely(err)) | |
14326 | + goto out_parent; | |
14327 | + if (!(cmoo & AuBrWAttr_MOO)) | |
14328 | + goto out_parent; /* success */ | |
14329 | + | |
14330 | + err = au_pin(&pin, dentry, cpg.bsrc, udba, | |
14331 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
14332 | + if (unlikely(err)) | |
14333 | + goto out_parent; | |
14334 | + | |
14335 | + h_path.mnt = au_br_mnt(br); | |
14336 | + h_path.dentry = au_h_dptr(dentry, cpg.bsrc); | |
5527c038 | 14337 | + hdir = au_hi(d_inode(parent), cpg.bsrc); |
076b876e AM |
14338 | + delegated = NULL; |
14339 | + err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, /*force*/1); | |
14340 | + au_unpin(&pin); | |
14341 | + /* todo: keep h_dentry or not? */ | |
14342 | + if (unlikely(err == -EWOULDBLOCK)) { | |
14343 | + pr_warn("cannot retry for NFSv4 delegation" | |
14344 | + " for an internal unlink\n"); | |
14345 | + iput(delegated); | |
14346 | + } | |
14347 | + if (unlikely(err)) { | |
14348 | + pr_err("unlink %pd after coo failed (%d), ignored\n", | |
14349 | + dentry, err); | |
14350 | + err = 0; | |
14351 | + } | |
14352 | + goto out_parent; /* success */ | |
14353 | + | |
14354 | +out_dgrade: | |
14355 | + di_downgrade_lock(parent, AuLock_IR); | |
14356 | +out_parent: | |
14357 | + di_read_unlock(parent, AuLock_IR); | |
14358 | + dput(parent); | |
14359 | +out: | |
14360 | + AuTraceErr(err); | |
14361 | + return err; | |
14362 | +} | |
14363 | + | |
b912730e | 14364 | +int au_do_open(struct file *file, struct au_do_open_args *args) |
1facf9fc | 14365 | +{ |
8b6a4947 | 14366 | + int err, aopen = args->aopen; |
1facf9fc | 14367 | + struct dentry *dentry; |
076b876e | 14368 | + struct au_finfo *finfo; |
1308ab2a | 14369 | + |
8b6a4947 | 14370 | + if (!aopen) |
b912730e AM |
14371 | + err = au_finfo_init(file, args->fidir); |
14372 | + else { | |
14373 | + lockdep_off(); | |
14374 | + err = au_finfo_init(file, args->fidir); | |
14375 | + lockdep_on(); | |
14376 | + } | |
4a4d8108 AM |
14377 | + if (unlikely(err)) |
14378 | + goto out; | |
1facf9fc | 14379 | + |
2000de60 | 14380 | + dentry = file->f_path.dentry; |
b912730e | 14381 | + AuDebugOn(IS_ERR_OR_NULL(dentry)); |
8b6a4947 AM |
14382 | + di_write_lock_child(dentry); |
14383 | + err = au_cmoo(dentry); | |
14384 | + di_downgrade_lock(dentry, AuLock_IR); | |
14385 | + if (!err) { | |
14386 | + if (!aopen) | |
b912730e | 14387 | + err = args->open(file, vfsub_file_flags(file), NULL); |
8b6a4947 AM |
14388 | + else { |
14389 | + lockdep_off(); | |
acd2b654 AM |
14390 | + err = args->open(file, vfsub_file_flags(file), |
14391 | + args->h_file); | |
8b6a4947 AM |
14392 | + lockdep_on(); |
14393 | + } | |
b912730e | 14394 | + } |
8b6a4947 | 14395 | + di_read_unlock(dentry, AuLock_IR); |
1facf9fc | 14396 | + |
076b876e AM |
14397 | + finfo = au_fi(file); |
14398 | + if (!err) { | |
14399 | + finfo->fi_file = file; | |
8b6a4947 AM |
14400 | + au_hbl_add(&finfo->fi_hlist, |
14401 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
076b876e | 14402 | + } |
8b6a4947 | 14403 | + if (!aopen) |
b912730e AM |
14404 | + fi_write_unlock(file); |
14405 | + else { | |
14406 | + lockdep_off(); | |
14407 | + fi_write_unlock(file); | |
14408 | + lockdep_on(); | |
14409 | + } | |
4a4d8108 | 14410 | + if (unlikely(err)) { |
076b876e | 14411 | + finfo->fi_hdir = NULL; |
1c60b727 | 14412 | + au_finfo_fin(file); |
1308ab2a | 14413 | + } |
4a4d8108 | 14414 | + |
4f0767ce | 14415 | +out: |
8b6a4947 | 14416 | + AuTraceErr(err); |
1308ab2a | 14417 | + return err; |
14418 | +} | |
dece6358 | 14419 | + |
4a4d8108 | 14420 | +int au_reopen_nondir(struct file *file) |
1308ab2a | 14421 | +{ |
4a4d8108 | 14422 | + int err; |
5afbbe0d | 14423 | + aufs_bindex_t btop; |
4a4d8108 | 14424 | + struct dentry *dentry; |
acd2b654 | 14425 | + struct au_branch *br; |
4a4d8108 | 14426 | + struct file *h_file, *h_file_tmp; |
1308ab2a | 14427 | + |
2000de60 | 14428 | + dentry = file->f_path.dentry; |
5afbbe0d | 14429 | + btop = au_dbtop(dentry); |
acd2b654 | 14430 | + br = au_sbr(dentry->d_sb, btop); |
4a4d8108 | 14431 | + h_file_tmp = NULL; |
5afbbe0d | 14432 | + if (au_fbtop(file) == btop) { |
4a4d8108 AM |
14433 | + h_file = au_hf_top(file); |
14434 | + if (file->f_mode == h_file->f_mode) | |
14435 | + return 0; /* success */ | |
14436 | + h_file_tmp = h_file; | |
14437 | + get_file(h_file_tmp); | |
acd2b654 | 14438 | + au_lcnt_inc(&br->br_nfiles); |
5afbbe0d | 14439 | + au_set_h_fptr(file, btop, NULL); |
4a4d8108 AM |
14440 | + } |
14441 | + AuDebugOn(au_fi(file)->fi_hdir); | |
86dc4139 AM |
14442 | + /* |
14443 | + * it can happen | |
14444 | + * file exists on both of rw and ro | |
5afbbe0d | 14445 | + * open --> dbtop and fbtop are both 0 |
86dc4139 AM |
14446 | + * prepend a branch as rw, "rw" become ro |
14447 | + * remove rw/file | |
14448 | + * delete the top branch, "rw" becomes rw again | |
5afbbe0d AM |
14449 | + * --> dbtop is 1, fbtop is still 0 |
14450 | + * write --> fbtop is 0 but dbtop is 1 | |
86dc4139 | 14451 | + */ |
5afbbe0d | 14452 | + /* AuDebugOn(au_fbtop(file) < btop); */ |
1308ab2a | 14453 | + |
5afbbe0d | 14454 | + h_file = au_h_open(dentry, btop, vfsub_file_flags(file) & ~O_TRUNC, |
392086de | 14455 | + file, /*force_wr*/0); |
4a4d8108 | 14456 | + err = PTR_ERR(h_file); |
86dc4139 AM |
14457 | + if (IS_ERR(h_file)) { |
14458 | + if (h_file_tmp) { | |
acd2b654 | 14459 | + /* revert */ |
5afbbe0d | 14460 | + au_set_h_fptr(file, btop, h_file_tmp); |
86dc4139 AM |
14461 | + h_file_tmp = NULL; |
14462 | + } | |
4a4d8108 | 14463 | + goto out; /* todo: close all? */ |
86dc4139 | 14464 | + } |
4a4d8108 AM |
14465 | + |
14466 | + err = 0; | |
5afbbe0d AM |
14467 | + au_set_fbtop(file, btop); |
14468 | + au_set_h_fptr(file, btop, h_file); | |
4a4d8108 AM |
14469 | + au_update_figen(file); |
14470 | + /* todo: necessary? */ | |
14471 | + /* file->f_ra = h_file->f_ra; */ | |
14472 | + | |
4f0767ce | 14473 | +out: |
acd2b654 | 14474 | + if (h_file_tmp) { |
4a4d8108 | 14475 | + fput(h_file_tmp); |
acd2b654 AM |
14476 | + au_lcnt_dec(&br->br_nfiles); |
14477 | + } | |
4a4d8108 | 14478 | + return err; |
1facf9fc | 14479 | +} |
14480 | + | |
1308ab2a | 14481 | +/* ---------------------------------------------------------------------- */ |
14482 | + | |
4a4d8108 AM |
14483 | +static int au_reopen_wh(struct file *file, aufs_bindex_t btgt, |
14484 | + struct dentry *hi_wh) | |
1facf9fc | 14485 | +{ |
4a4d8108 | 14486 | + int err; |
5afbbe0d | 14487 | + aufs_bindex_t btop; |
4a4d8108 AM |
14488 | + struct au_dinfo *dinfo; |
14489 | + struct dentry *h_dentry; | |
14490 | + struct au_hdentry *hdp; | |
1facf9fc | 14491 | + |
2000de60 | 14492 | + dinfo = au_di(file->f_path.dentry); |
4a4d8108 | 14493 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
dece6358 | 14494 | + |
5afbbe0d AM |
14495 | + btop = dinfo->di_btop; |
14496 | + dinfo->di_btop = btgt; | |
14497 | + hdp = au_hdentry(dinfo, btgt); | |
14498 | + h_dentry = hdp->hd_dentry; | |
14499 | + hdp->hd_dentry = hi_wh; | |
4a4d8108 | 14500 | + err = au_reopen_nondir(file); |
5afbbe0d AM |
14501 | + hdp->hd_dentry = h_dentry; |
14502 | + dinfo->di_btop = btop; | |
1facf9fc | 14503 | + |
1facf9fc | 14504 | + return err; |
14505 | +} | |
14506 | + | |
4a4d8108 | 14507 | +static int au_ready_to_write_wh(struct file *file, loff_t len, |
86dc4139 | 14508 | + aufs_bindex_t bcpup, struct au_pin *pin) |
1facf9fc | 14509 | +{ |
4a4d8108 | 14510 | + int err; |
027c5e7a | 14511 | + struct inode *inode, *h_inode; |
c2b27bf2 AM |
14512 | + struct dentry *h_dentry, *hi_wh; |
14513 | + struct au_cp_generic cpg = { | |
2000de60 | 14514 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14515 | + .bdst = bcpup, |
14516 | + .bsrc = -1, | |
14517 | + .len = len, | |
14518 | + .pin = pin | |
14519 | + }; | |
1facf9fc | 14520 | + |
5afbbe0d | 14521 | + au_update_dbtop(cpg.dentry); |
5527c038 | 14522 | + inode = d_inode(cpg.dentry); |
027c5e7a | 14523 | + h_inode = NULL; |
5afbbe0d AM |
14524 | + if (au_dbtop(cpg.dentry) <= bcpup |
14525 | + && au_dbbot(cpg.dentry) >= bcpup) { | |
c2b27bf2 | 14526 | + h_dentry = au_h_dptr(cpg.dentry, bcpup); |
5527c038 JR |
14527 | + if (h_dentry && d_is_positive(h_dentry)) |
14528 | + h_inode = d_inode(h_dentry); | |
027c5e7a | 14529 | + } |
4a4d8108 | 14530 | + hi_wh = au_hi_wh(inode, bcpup); |
027c5e7a | 14531 | + if (!hi_wh && !h_inode) |
c2b27bf2 | 14532 | + err = au_sio_cpup_wh(&cpg, file); |
4a4d8108 AM |
14533 | + else |
14534 | + /* already copied-up after unlink */ | |
14535 | + err = au_reopen_wh(file, bcpup, hi_wh); | |
1facf9fc | 14536 | + |
4a4d8108 | 14537 | + if (!err |
38d290e6 JR |
14538 | + && (inode->i_nlink > 1 |
14539 | + || (inode->i_state & I_LINKABLE)) | |
c2b27bf2 AM |
14540 | + && au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK)) |
14541 | + au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup)); | |
1308ab2a | 14542 | + |
dece6358 | 14543 | + return err; |
1facf9fc | 14544 | +} |
14545 | + | |
4a4d8108 AM |
14546 | +/* |
14547 | + * prepare the @file for writing. | |
14548 | + */ | |
14549 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin) | |
1facf9fc | 14550 | +{ |
4a4d8108 | 14551 | + int err; |
5afbbe0d | 14552 | + aufs_bindex_t dbtop; |
c1595e42 | 14553 | + struct dentry *parent; |
86dc4139 | 14554 | + struct inode *inode; |
1facf9fc | 14555 | + struct super_block *sb; |
4a4d8108 | 14556 | + struct file *h_file; |
c2b27bf2 | 14557 | + struct au_cp_generic cpg = { |
2000de60 | 14558 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14559 | + .bdst = -1, |
14560 | + .bsrc = -1, | |
14561 | + .len = len, | |
14562 | + .pin = pin, | |
14563 | + .flags = AuCpup_DTIME | |
14564 | + }; | |
1facf9fc | 14565 | + |
c2b27bf2 | 14566 | + sb = cpg.dentry->d_sb; |
5527c038 | 14567 | + inode = d_inode(cpg.dentry); |
5afbbe0d | 14568 | + cpg.bsrc = au_fbtop(file); |
c2b27bf2 | 14569 | + err = au_test_ro(sb, cpg.bsrc, inode); |
4a4d8108 | 14570 | + if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) { |
c2b27bf2 AM |
14571 | + err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE, |
14572 | + /*flags*/0); | |
1facf9fc | 14573 | + goto out; |
4a4d8108 | 14574 | + } |
1facf9fc | 14575 | + |
027c5e7a | 14576 | + /* need to cpup or reopen */ |
c2b27bf2 | 14577 | + parent = dget_parent(cpg.dentry); |
4a4d8108 | 14578 | + di_write_lock_parent(parent); |
c2b27bf2 AM |
14579 | + err = AuWbrCopyup(au_sbi(sb), cpg.dentry); |
14580 | + cpg.bdst = err; | |
4a4d8108 AM |
14581 | + if (unlikely(err < 0)) |
14582 | + goto out_dgrade; | |
14583 | + err = 0; | |
14584 | + | |
c2b27bf2 AM |
14585 | + if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) { |
14586 | + err = au_cpup_dirs(cpg.dentry, cpg.bdst); | |
1facf9fc | 14587 | + if (unlikely(err)) |
4a4d8108 AM |
14588 | + goto out_dgrade; |
14589 | + } | |
14590 | + | |
c2b27bf2 | 14591 | + err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, |
4a4d8108 AM |
14592 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); |
14593 | + if (unlikely(err)) | |
14594 | + goto out_dgrade; | |
14595 | + | |
5afbbe0d AM |
14596 | + dbtop = au_dbtop(cpg.dentry); |
14597 | + if (dbtop <= cpg.bdst) | |
c2b27bf2 | 14598 | + cpg.bsrc = cpg.bdst; |
027c5e7a | 14599 | + |
5afbbe0d | 14600 | + if (dbtop <= cpg.bdst /* just reopen */ |
c2b27bf2 | 14601 | + || !d_unhashed(cpg.dentry) /* copyup and reopen */ |
027c5e7a | 14602 | + ) { |
392086de | 14603 | + h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0); |
86dc4139 | 14604 | + if (IS_ERR(h_file)) |
027c5e7a | 14605 | + err = PTR_ERR(h_file); |
86dc4139 | 14606 | + else { |
027c5e7a | 14607 | + di_downgrade_lock(parent, AuLock_IR); |
5afbbe0d | 14608 | + if (dbtop > cpg.bdst) |
c2b27bf2 | 14609 | + err = au_sio_cpup_simple(&cpg); |
027c5e7a AM |
14610 | + if (!err) |
14611 | + err = au_reopen_nondir(file); | |
c2b27bf2 | 14612 | + au_h_open_post(cpg.dentry, cpg.bsrc, h_file); |
027c5e7a | 14613 | + } |
027c5e7a AM |
14614 | + } else { /* copyup as wh and reopen */ |
14615 | + /* | |
14616 | + * since writable hfsplus branch is not supported, | |
14617 | + * h_open_pre/post() are unnecessary. | |
14618 | + */ | |
c2b27bf2 | 14619 | + err = au_ready_to_write_wh(file, len, cpg.bdst, pin); |
4a4d8108 | 14620 | + di_downgrade_lock(parent, AuLock_IR); |
4a4d8108 | 14621 | + } |
4a4d8108 AM |
14622 | + |
14623 | + if (!err) { | |
14624 | + au_pin_set_parent_lflag(pin, /*lflag*/0); | |
14625 | + goto out_dput; /* success */ | |
14626 | + } | |
14627 | + au_unpin(pin); | |
14628 | + goto out_unlock; | |
1facf9fc | 14629 | + |
4f0767ce | 14630 | +out_dgrade: |
4a4d8108 | 14631 | + di_downgrade_lock(parent, AuLock_IR); |
4f0767ce | 14632 | +out_unlock: |
4a4d8108 | 14633 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 14634 | +out_dput: |
4a4d8108 | 14635 | + dput(parent); |
4f0767ce | 14636 | +out: |
1facf9fc | 14637 | + return err; |
14638 | +} | |
14639 | + | |
4a4d8108 AM |
14640 | +/* ---------------------------------------------------------------------- */ |
14641 | + | |
14642 | +int au_do_flush(struct file *file, fl_owner_t id, | |
14643 | + int (*flush)(struct file *file, fl_owner_t id)) | |
1facf9fc | 14644 | +{ |
4a4d8108 | 14645 | + int err; |
1facf9fc | 14646 | + struct super_block *sb; |
4a4d8108 | 14647 | + struct inode *inode; |
1facf9fc | 14648 | + |
c06a8ce3 AM |
14649 | + inode = file_inode(file); |
14650 | + sb = inode->i_sb; | |
4a4d8108 AM |
14651 | + si_noflush_read_lock(sb); |
14652 | + fi_read_lock(file); | |
b752ccd1 | 14653 | + ii_read_lock_child(inode); |
1facf9fc | 14654 | + |
4a4d8108 AM |
14655 | + err = flush(file, id); |
14656 | + au_cpup_attr_timesizes(inode); | |
1facf9fc | 14657 | + |
b752ccd1 | 14658 | + ii_read_unlock(inode); |
4a4d8108 | 14659 | + fi_read_unlock(file); |
1308ab2a | 14660 | + si_read_unlock(sb); |
dece6358 | 14661 | + return err; |
1facf9fc | 14662 | +} |
14663 | + | |
4a4d8108 AM |
14664 | +/* ---------------------------------------------------------------------- */ |
14665 | + | |
14666 | +static int au_file_refresh_by_inode(struct file *file, int *need_reopen) | |
1facf9fc | 14667 | +{ |
4a4d8108 | 14668 | + int err; |
4a4d8108 AM |
14669 | + struct au_pin pin; |
14670 | + struct au_finfo *finfo; | |
c2b27bf2 | 14671 | + struct dentry *parent, *hi_wh; |
4a4d8108 | 14672 | + struct inode *inode; |
1facf9fc | 14673 | + struct super_block *sb; |
c2b27bf2 | 14674 | + struct au_cp_generic cpg = { |
2000de60 | 14675 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14676 | + .bdst = -1, |
14677 | + .bsrc = -1, | |
14678 | + .len = -1, | |
14679 | + .pin = &pin, | |
14680 | + .flags = AuCpup_DTIME | |
14681 | + }; | |
1facf9fc | 14682 | + |
4a4d8108 AM |
14683 | + FiMustWriteLock(file); |
14684 | + | |
14685 | + err = 0; | |
14686 | + finfo = au_fi(file); | |
c2b27bf2 | 14687 | + sb = cpg.dentry->d_sb; |
5527c038 | 14688 | + inode = d_inode(cpg.dentry); |
5afbbe0d | 14689 | + cpg.bdst = au_ibtop(inode); |
c2b27bf2 | 14690 | + if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry)) |
1308ab2a | 14691 | + goto out; |
dece6358 | 14692 | + |
c2b27bf2 AM |
14693 | + parent = dget_parent(cpg.dentry); |
14694 | + if (au_test_ro(sb, cpg.bdst, inode)) { | |
4a4d8108 | 14695 | + di_read_lock_parent(parent, !AuLock_IR); |
c2b27bf2 AM |
14696 | + err = AuWbrCopyup(au_sbi(sb), cpg.dentry); |
14697 | + cpg.bdst = err; | |
4a4d8108 AM |
14698 | + di_read_unlock(parent, !AuLock_IR); |
14699 | + if (unlikely(err < 0)) | |
14700 | + goto out_parent; | |
14701 | + err = 0; | |
1facf9fc | 14702 | + } |
1facf9fc | 14703 | + |
4a4d8108 | 14704 | + di_read_lock_parent(parent, AuLock_IR); |
c2b27bf2 | 14705 | + hi_wh = au_hi_wh(inode, cpg.bdst); |
7f207e10 AM |
14706 | + if (!S_ISDIR(inode->i_mode) |
14707 | + && au_opt_test(au_mntflags(sb), PLINK) | |
4a4d8108 | 14708 | + && au_plink_test(inode) |
c2b27bf2 | 14709 | + && !d_unhashed(cpg.dentry) |
5afbbe0d | 14710 | + && cpg.bdst < au_dbtop(cpg.dentry)) { |
c2b27bf2 | 14711 | + err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst); |
4a4d8108 AM |
14712 | + if (unlikely(err)) |
14713 | + goto out_unlock; | |
14714 | + | |
14715 | + /* always superio. */ | |
c2b27bf2 | 14716 | + err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, |
4a4d8108 | 14717 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); |
367653fa | 14718 | + if (!err) { |
c2b27bf2 | 14719 | + err = au_sio_cpup_simple(&cpg); |
367653fa AM |
14720 | + au_unpin(&pin); |
14721 | + } | |
4a4d8108 AM |
14722 | + } else if (hi_wh) { |
14723 | + /* already copied-up after unlink */ | |
c2b27bf2 | 14724 | + err = au_reopen_wh(file, cpg.bdst, hi_wh); |
4a4d8108 AM |
14725 | + *need_reopen = 0; |
14726 | + } | |
1facf9fc | 14727 | + |
4f0767ce | 14728 | +out_unlock: |
4a4d8108 | 14729 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 14730 | +out_parent: |
4a4d8108 | 14731 | + dput(parent); |
4f0767ce | 14732 | +out: |
1308ab2a | 14733 | + return err; |
dece6358 | 14734 | +} |
1facf9fc | 14735 | + |
4a4d8108 | 14736 | +static void au_do_refresh_dir(struct file *file) |
dece6358 | 14737 | +{ |
5afbbe0d | 14738 | + aufs_bindex_t bindex, bbot, new_bindex, brid; |
4a4d8108 AM |
14739 | + struct au_hfile *p, tmp, *q; |
14740 | + struct au_finfo *finfo; | |
1308ab2a | 14741 | + struct super_block *sb; |
4a4d8108 | 14742 | + struct au_fidir *fidir; |
1facf9fc | 14743 | + |
4a4d8108 | 14744 | + FiMustWriteLock(file); |
1facf9fc | 14745 | + |
2000de60 | 14746 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 AM |
14747 | + finfo = au_fi(file); |
14748 | + fidir = finfo->fi_hdir; | |
14749 | + AuDebugOn(!fidir); | |
14750 | + p = fidir->fd_hfile + finfo->fi_btop; | |
14751 | + brid = p->hf_br->br_id; | |
5afbbe0d AM |
14752 | + bbot = fidir->fd_bbot; |
14753 | + for (bindex = finfo->fi_btop; bindex <= bbot; bindex++, p++) { | |
4a4d8108 AM |
14754 | + if (!p->hf_file) |
14755 | + continue; | |
1308ab2a | 14756 | + |
4a4d8108 AM |
14757 | + new_bindex = au_br_index(sb, p->hf_br->br_id); |
14758 | + if (new_bindex == bindex) | |
14759 | + continue; | |
14760 | + if (new_bindex < 0) { | |
14761 | + au_set_h_fptr(file, bindex, NULL); | |
14762 | + continue; | |
14763 | + } | |
1308ab2a | 14764 | + |
4a4d8108 AM |
14765 | + /* swap two lower inode, and loop again */ |
14766 | + q = fidir->fd_hfile + new_bindex; | |
14767 | + tmp = *q; | |
14768 | + *q = *p; | |
14769 | + *p = tmp; | |
14770 | + if (tmp.hf_file) { | |
14771 | + bindex--; | |
14772 | + p--; | |
14773 | + } | |
14774 | + } | |
1308ab2a | 14775 | + |
4a4d8108 | 14776 | + p = fidir->fd_hfile; |
2000de60 | 14777 | + if (!au_test_mmapped(file) && !d_unlinked(file->f_path.dentry)) { |
5afbbe0d AM |
14778 | + bbot = au_sbbot(sb); |
14779 | + for (finfo->fi_btop = 0; finfo->fi_btop <= bbot; | |
4a4d8108 AM |
14780 | + finfo->fi_btop++, p++) |
14781 | + if (p->hf_file) { | |
c06a8ce3 | 14782 | + if (file_inode(p->hf_file)) |
4a4d8108 | 14783 | + break; |
1c60b727 | 14784 | + au_hfput(p, /*execed*/0); |
4a4d8108 AM |
14785 | + } |
14786 | + } else { | |
5afbbe0d AM |
14787 | + bbot = au_br_index(sb, brid); |
14788 | + for (finfo->fi_btop = 0; finfo->fi_btop < bbot; | |
4a4d8108 AM |
14789 | + finfo->fi_btop++, p++) |
14790 | + if (p->hf_file) | |
1c60b727 | 14791 | + au_hfput(p, /*execed*/0); |
5afbbe0d | 14792 | + bbot = au_sbbot(sb); |
4a4d8108 | 14793 | + } |
1308ab2a | 14794 | + |
5afbbe0d AM |
14795 | + p = fidir->fd_hfile + bbot; |
14796 | + for (fidir->fd_bbot = bbot; fidir->fd_bbot >= finfo->fi_btop; | |
4a4d8108 AM |
14797 | + fidir->fd_bbot--, p--) |
14798 | + if (p->hf_file) { | |
c06a8ce3 | 14799 | + if (file_inode(p->hf_file)) |
4a4d8108 | 14800 | + break; |
1c60b727 | 14801 | + au_hfput(p, /*execed*/0); |
4a4d8108 AM |
14802 | + } |
14803 | + AuDebugOn(fidir->fd_bbot < finfo->fi_btop); | |
1308ab2a | 14804 | +} |
14805 | + | |
4a4d8108 AM |
14806 | +/* |
14807 | + * after branch manipulating, refresh the file. | |
14808 | + */ | |
14809 | +static int refresh_file(struct file *file, int (*reopen)(struct file *file)) | |
1facf9fc | 14810 | +{ |
e2f27e51 | 14811 | + int err, need_reopen, nbr; |
5afbbe0d | 14812 | + aufs_bindex_t bbot, bindex; |
4a4d8108 | 14813 | + struct dentry *dentry; |
e2f27e51 | 14814 | + struct super_block *sb; |
1308ab2a | 14815 | + struct au_finfo *finfo; |
4a4d8108 | 14816 | + struct au_hfile *hfile; |
1facf9fc | 14817 | + |
2000de60 | 14818 | + dentry = file->f_path.dentry; |
e2f27e51 AM |
14819 | + sb = dentry->d_sb; |
14820 | + nbr = au_sbbot(sb) + 1; | |
1308ab2a | 14821 | + finfo = au_fi(file); |
4a4d8108 AM |
14822 | + if (!finfo->fi_hdir) { |
14823 | + hfile = &finfo->fi_htop; | |
14824 | + AuDebugOn(!hfile->hf_file); | |
e2f27e51 | 14825 | + bindex = au_br_index(sb, hfile->hf_br->br_id); |
4a4d8108 AM |
14826 | + AuDebugOn(bindex < 0); |
14827 | + if (bindex != finfo->fi_btop) | |
5afbbe0d | 14828 | + au_set_fbtop(file, bindex); |
4a4d8108 | 14829 | + } else { |
e2f27e51 | 14830 | + err = au_fidir_realloc(finfo, nbr, /*may_shrink*/0); |
4a4d8108 AM |
14831 | + if (unlikely(err)) |
14832 | + goto out; | |
14833 | + au_do_refresh_dir(file); | |
14834 | + } | |
1facf9fc | 14835 | + |
4a4d8108 AM |
14836 | + err = 0; |
14837 | + need_reopen = 1; | |
14838 | + if (!au_test_mmapped(file)) | |
14839 | + err = au_file_refresh_by_inode(file, &need_reopen); | |
e2f27e51 AM |
14840 | + if (finfo->fi_hdir) |
14841 | + /* harmless if err */ | |
14842 | + au_fidir_realloc(finfo, nbr, /*may_shrink*/1); | |
027c5e7a | 14843 | + if (!err && need_reopen && !d_unlinked(dentry)) |
4a4d8108 AM |
14844 | + err = reopen(file); |
14845 | + if (!err) { | |
14846 | + au_update_figen(file); | |
14847 | + goto out; /* success */ | |
14848 | + } | |
14849 | + | |
14850 | + /* error, close all lower files */ | |
14851 | + if (finfo->fi_hdir) { | |
5afbbe0d AM |
14852 | + bbot = au_fbbot_dir(file); |
14853 | + for (bindex = au_fbtop(file); bindex <= bbot; bindex++) | |
4a4d8108 AM |
14854 | + au_set_h_fptr(file, bindex, NULL); |
14855 | + } | |
1facf9fc | 14856 | + |
4f0767ce | 14857 | +out: |
1facf9fc | 14858 | + return err; |
14859 | +} | |
14860 | + | |
4a4d8108 AM |
14861 | +/* common function to regular file and dir */ |
14862 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
521ced18 | 14863 | + int wlock, unsigned int fi_lsc) |
dece6358 | 14864 | +{ |
1308ab2a | 14865 | + int err; |
4a4d8108 | 14866 | + unsigned int sigen, figen; |
5afbbe0d | 14867 | + aufs_bindex_t btop; |
4a4d8108 AM |
14868 | + unsigned char pseudo_link; |
14869 | + struct dentry *dentry; | |
14870 | + struct inode *inode; | |
1facf9fc | 14871 | + |
4a4d8108 | 14872 | + err = 0; |
2000de60 | 14873 | + dentry = file->f_path.dentry; |
5527c038 | 14874 | + inode = d_inode(dentry); |
4a4d8108 | 14875 | + sigen = au_sigen(dentry->d_sb); |
521ced18 | 14876 | + fi_write_lock_nested(file, fi_lsc); |
4a4d8108 | 14877 | + figen = au_figen(file); |
521ced18 JR |
14878 | + if (!fi_lsc) |
14879 | + di_write_lock_child(dentry); | |
14880 | + else | |
14881 | + di_write_lock_child2(dentry); | |
5afbbe0d AM |
14882 | + btop = au_dbtop(dentry); |
14883 | + pseudo_link = (btop != au_ibtop(inode)); | |
14884 | + if (sigen == figen && !pseudo_link && au_fbtop(file) == btop) { | |
4a4d8108 AM |
14885 | + if (!wlock) { |
14886 | + di_downgrade_lock(dentry, AuLock_IR); | |
14887 | + fi_downgrade_lock(file); | |
14888 | + } | |
14889 | + goto out; /* success */ | |
14890 | + } | |
dece6358 | 14891 | + |
4a4d8108 | 14892 | + AuDbg("sigen %d, figen %d\n", sigen, figen); |
027c5e7a | 14893 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 | 14894 | + err = au_reval_dpath(dentry, sigen); |
027c5e7a | 14895 | + AuDebugOn(!err && au_digen_test(dentry, sigen)); |
4a4d8108 | 14896 | + } |
dece6358 | 14897 | + |
027c5e7a AM |
14898 | + if (!err) |
14899 | + err = refresh_file(file, reopen); | |
4a4d8108 AM |
14900 | + if (!err) { |
14901 | + if (!wlock) { | |
14902 | + di_downgrade_lock(dentry, AuLock_IR); | |
14903 | + fi_downgrade_lock(file); | |
14904 | + } | |
14905 | + } else { | |
14906 | + di_write_unlock(dentry); | |
14907 | + fi_write_unlock(file); | |
14908 | + } | |
1facf9fc | 14909 | + |
4f0767ce | 14910 | +out: |
1308ab2a | 14911 | + return err; |
14912 | +} | |
1facf9fc | 14913 | + |
4a4d8108 AM |
14914 | +/* ---------------------------------------------------------------------- */ |
14915 | + | |
14916 | +/* cf. aufs_nopage() */ | |
14917 | +/* for madvise(2) */ | |
14918 | +static int aufs_readpage(struct file *file __maybe_unused, struct page *page) | |
1308ab2a | 14919 | +{ |
4a4d8108 AM |
14920 | + unlock_page(page); |
14921 | + return 0; | |
14922 | +} | |
1facf9fc | 14923 | + |
4a4d8108 | 14924 | +/* it will never be called, but necessary to support O_DIRECT */ |
5afbbe0d | 14925 | +static ssize_t aufs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
4a4d8108 | 14926 | +{ BUG(); return 0; } |
1facf9fc | 14927 | + |
4a4d8108 AM |
14928 | +/* they will never be called. */ |
14929 | +#ifdef CONFIG_AUFS_DEBUG | |
14930 | +static int aufs_write_begin(struct file *file, struct address_space *mapping, | |
14931 | + loff_t pos, unsigned len, unsigned flags, | |
14932 | + struct page **pagep, void **fsdata) | |
14933 | +{ AuUnsupport(); return 0; } | |
14934 | +static int aufs_write_end(struct file *file, struct address_space *mapping, | |
14935 | + loff_t pos, unsigned len, unsigned copied, | |
14936 | + struct page *page, void *fsdata) | |
14937 | +{ AuUnsupport(); return 0; } | |
14938 | +static int aufs_writepage(struct page *page, struct writeback_control *wbc) | |
14939 | +{ AuUnsupport(); return 0; } | |
1308ab2a | 14940 | + |
4a4d8108 AM |
14941 | +static int aufs_set_page_dirty(struct page *page) |
14942 | +{ AuUnsupport(); return 0; } | |
392086de AM |
14943 | +static void aufs_invalidatepage(struct page *page, unsigned int offset, |
14944 | + unsigned int length) | |
4a4d8108 AM |
14945 | +{ AuUnsupport(); } |
14946 | +static int aufs_releasepage(struct page *page, gfp_t gfp) | |
14947 | +{ AuUnsupport(); return 0; } | |
79b8bda9 | 14948 | +#if 0 /* called by memory compaction regardless file */ |
4a4d8108 | 14949 | +static int aufs_migratepage(struct address_space *mapping, struct page *newpage, |
7eafdf33 | 14950 | + struct page *page, enum migrate_mode mode) |
4a4d8108 | 14951 | +{ AuUnsupport(); return 0; } |
79b8bda9 | 14952 | +#endif |
e2f27e51 AM |
14953 | +static bool aufs_isolate_page(struct page *page, isolate_mode_t mode) |
14954 | +{ AuUnsupport(); return true; } | |
14955 | +static void aufs_putback_page(struct page *page) | |
14956 | +{ AuUnsupport(); } | |
4a4d8108 AM |
14957 | +static int aufs_launder_page(struct page *page) |
14958 | +{ AuUnsupport(); return 0; } | |
14959 | +static int aufs_is_partially_uptodate(struct page *page, | |
38d290e6 JR |
14960 | + unsigned long from, |
14961 | + unsigned long count) | |
4a4d8108 | 14962 | +{ AuUnsupport(); return 0; } |
392086de AM |
14963 | +static void aufs_is_dirty_writeback(struct page *page, bool *dirty, |
14964 | + bool *writeback) | |
14965 | +{ AuUnsupport(); } | |
4a4d8108 AM |
14966 | +static int aufs_error_remove_page(struct address_space *mapping, |
14967 | + struct page *page) | |
14968 | +{ AuUnsupport(); return 0; } | |
b4510431 AM |
14969 | +static int aufs_swap_activate(struct swap_info_struct *sis, struct file *file, |
14970 | + sector_t *span) | |
14971 | +{ AuUnsupport(); return 0; } | |
14972 | +static void aufs_swap_deactivate(struct file *file) | |
14973 | +{ AuUnsupport(); } | |
4a4d8108 AM |
14974 | +#endif /* CONFIG_AUFS_DEBUG */ |
14975 | + | |
14976 | +const struct address_space_operations aufs_aop = { | |
14977 | + .readpage = aufs_readpage, | |
14978 | + .direct_IO = aufs_direct_IO, | |
4a4d8108 AM |
14979 | +#ifdef CONFIG_AUFS_DEBUG |
14980 | + .writepage = aufs_writepage, | |
4a4d8108 AM |
14981 | + /* no writepages, because of writepage */ |
14982 | + .set_page_dirty = aufs_set_page_dirty, | |
14983 | + /* no readpages, because of readpage */ | |
14984 | + .write_begin = aufs_write_begin, | |
14985 | + .write_end = aufs_write_end, | |
14986 | + /* no bmap, no block device */ | |
14987 | + .invalidatepage = aufs_invalidatepage, | |
14988 | + .releasepage = aufs_releasepage, | |
79b8bda9 AM |
14989 | + /* is fallback_migrate_page ok? */ |
14990 | + /* .migratepage = aufs_migratepage, */ | |
e2f27e51 AM |
14991 | + .isolate_page = aufs_isolate_page, |
14992 | + .putback_page = aufs_putback_page, | |
4a4d8108 AM |
14993 | + .launder_page = aufs_launder_page, |
14994 | + .is_partially_uptodate = aufs_is_partially_uptodate, | |
392086de | 14995 | + .is_dirty_writeback = aufs_is_dirty_writeback, |
b4510431 AM |
14996 | + .error_remove_page = aufs_error_remove_page, |
14997 | + .swap_activate = aufs_swap_activate, | |
14998 | + .swap_deactivate = aufs_swap_deactivate | |
4a4d8108 | 14999 | +#endif /* CONFIG_AUFS_DEBUG */ |
dece6358 | 15000 | +}; |
7f207e10 | 15001 | diff -urN /usr/share/empty/fs/aufs/file.h linux/fs/aufs/file.h |
eca34b5c | 15002 | --- /usr/share/empty/fs/aufs/file.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 15003 | +++ linux/fs/aufs/file.h 2020-01-27 10:57:18.172204883 +0100 |
9f237c51 | 15004 | @@ -0,0 +1,342 @@ |
062440b3 | 15005 | +/* SPDX-License-Identifier: GPL-2.0 */ |
4a4d8108 | 15006 | +/* |
016522bc | 15007 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
15008 | + * |
15009 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15010 | + * it under the terms of the GNU General Public License as published by | |
15011 | + * the Free Software Foundation; either version 2 of the License, or | |
15012 | + * (at your option) any later version. | |
15013 | + * | |
15014 | + * This program is distributed in the hope that it will be useful, | |
15015 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15016 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15017 | + * GNU General Public License for more details. | |
15018 | + * | |
15019 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15020 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 15021 | + */ |
1facf9fc | 15022 | + |
4a4d8108 AM |
15023 | +/* |
15024 | + * file operations | |
15025 | + */ | |
1facf9fc | 15026 | + |
4a4d8108 AM |
15027 | +#ifndef __AUFS_FILE_H__ |
15028 | +#define __AUFS_FILE_H__ | |
1facf9fc | 15029 | + |
4a4d8108 | 15030 | +#ifdef __KERNEL__ |
1facf9fc | 15031 | + |
2cbb1c4b | 15032 | +#include <linux/file.h> |
4a4d8108 | 15033 | +#include <linux/fs.h> |
3c1bdaff | 15034 | +#include <linux/mm_types.h> |
4a4d8108 | 15035 | +#include <linux/poll.h> |
4a4d8108 | 15036 | +#include "rwsem.h" |
1facf9fc | 15037 | + |
4a4d8108 AM |
15038 | +struct au_branch; |
15039 | +struct au_hfile { | |
15040 | + struct file *hf_file; | |
15041 | + struct au_branch *hf_br; | |
15042 | +}; | |
1facf9fc | 15043 | + |
4a4d8108 AM |
15044 | +struct au_vdir; |
15045 | +struct au_fidir { | |
15046 | + aufs_bindex_t fd_bbot; | |
15047 | + aufs_bindex_t fd_nent; | |
15048 | + struct au_vdir *fd_vdir_cache; | |
15049 | + struct au_hfile fd_hfile[]; | |
15050 | +}; | |
1facf9fc | 15051 | + |
4a4d8108 | 15052 | +static inline int au_fidir_sz(int nent) |
dece6358 | 15053 | +{ |
4f0767ce JR |
15054 | + AuDebugOn(nent < 0); |
15055 | + return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent; | |
4a4d8108 | 15056 | +} |
1facf9fc | 15057 | + |
4a4d8108 AM |
15058 | +struct au_finfo { |
15059 | + atomic_t fi_generation; | |
dece6358 | 15060 | + |
4a4d8108 AM |
15061 | + struct au_rwsem fi_rwsem; |
15062 | + aufs_bindex_t fi_btop; | |
15063 | + | |
15064 | + /* do not union them */ | |
15065 | + struct { /* for non-dir */ | |
15066 | + struct au_hfile fi_htop; | |
2cbb1c4b | 15067 | + atomic_t fi_mmapped; |
4a4d8108 AM |
15068 | + }; |
15069 | + struct au_fidir *fi_hdir; /* for dir only */ | |
523b37e3 | 15070 | + |
8b6a4947 | 15071 | + struct hlist_bl_node fi_hlist; |
1c60b727 | 15072 | + struct file *fi_file; /* very ugly */ |
9f237c51 | 15073 | + struct rcu_head rcu; |
4a4d8108 | 15074 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 15075 | + |
4a4d8108 | 15076 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15077 | + |
4a4d8108 AM |
15078 | +/* file.c */ |
15079 | +extern const struct address_space_operations aufs_aop; | |
15080 | +unsigned int au_file_roflags(unsigned int flags); | |
15081 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
392086de | 15082 | + struct file *file, int force_wr); |
b912730e | 15083 | +struct au_do_open_args { |
8b6a4947 | 15084 | + int aopen; |
b912730e AM |
15085 | + int (*open)(struct file *file, int flags, |
15086 | + struct file *h_file); | |
15087 | + struct au_fidir *fidir; | |
15088 | + struct file *h_file; | |
15089 | +}; | |
15090 | +int au_do_open(struct file *file, struct au_do_open_args *args); | |
4a4d8108 AM |
15091 | +int au_reopen_nondir(struct file *file); |
15092 | +struct au_pin; | |
15093 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin); | |
15094 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
521ced18 | 15095 | + int wlock, unsigned int fi_lsc); |
4a4d8108 AM |
15096 | +int au_do_flush(struct file *file, fl_owner_t id, |
15097 | + int (*flush)(struct file *file, fl_owner_t id)); | |
1facf9fc | 15098 | + |
4a4d8108 AM |
15099 | +/* poll.c */ |
15100 | +#ifdef CONFIG_AUFS_POLL | |
cd7a4cd9 | 15101 | +__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt); |
4a4d8108 | 15102 | +#endif |
1facf9fc | 15103 | + |
4a4d8108 AM |
15104 | +#ifdef CONFIG_AUFS_BR_HFSPLUS |
15105 | +/* hfsplus.c */ | |
392086de AM |
15106 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, |
15107 | + int force_wr); | |
4a4d8108 AM |
15108 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
15109 | + struct file *h_file); | |
15110 | +#else | |
c1595e42 JR |
15111 | +AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry, |
15112 | + aufs_bindex_t bindex, int force_wr) | |
4a4d8108 AM |
15113 | +AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex, |
15114 | + struct file *h_file); | |
15115 | +#endif | |
1facf9fc | 15116 | + |
4a4d8108 AM |
15117 | +/* f_op.c */ |
15118 | +extern const struct file_operations aufs_file_fop; | |
b912730e | 15119 | +int au_do_open_nondir(struct file *file, int flags, struct file *h_file); |
4a4d8108 | 15120 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file); |
521ced18 | 15121 | +struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc); |
4a4d8108 | 15122 | + |
4a4d8108 | 15123 | +/* finfo.c */ |
f0c0a007 | 15124 | +void au_hfput(struct au_hfile *hf, int execed); |
4a4d8108 AM |
15125 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, |
15126 | + struct file *h_file); | |
1facf9fc | 15127 | + |
4a4d8108 | 15128 | +void au_update_figen(struct file *file); |
4a4d8108 | 15129 | +struct au_fidir *au_fidir_alloc(struct super_block *sb); |
e2f27e51 | 15130 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink); |
1facf9fc | 15131 | + |
4a4d8108 | 15132 | +void au_fi_init_once(void *_fi); |
1c60b727 | 15133 | +void au_finfo_fin(struct file *file); |
4a4d8108 | 15134 | +int au_finfo_init(struct file *file, struct au_fidir *fidir); |
1facf9fc | 15135 | + |
4a4d8108 AM |
15136 | +/* ioctl.c */ |
15137 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
15138 | +#ifdef CONFIG_COMPAT |
15139 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
15140 | + unsigned long arg); | |
c2b27bf2 AM |
15141 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, |
15142 | + unsigned long arg); | |
b752ccd1 | 15143 | +#endif |
1facf9fc | 15144 | + |
4a4d8108 | 15145 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15146 | + |
4a4d8108 AM |
15147 | +static inline struct au_finfo *au_fi(struct file *file) |
15148 | +{ | |
38d290e6 | 15149 | + return file->private_data; |
4a4d8108 | 15150 | +} |
1facf9fc | 15151 | + |
4a4d8108 | 15152 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15153 | + |
8b6a4947 AM |
15154 | +#define fi_read_lock(f) au_rw_read_lock(&au_fi(f)->fi_rwsem) |
15155 | +#define fi_write_lock(f) au_rw_write_lock(&au_fi(f)->fi_rwsem) | |
15156 | +#define fi_read_trylock(f) au_rw_read_trylock(&au_fi(f)->fi_rwsem) | |
15157 | +#define fi_write_trylock(f) au_rw_write_trylock(&au_fi(f)->fi_rwsem) | |
4a4d8108 | 15158 | +/* |
8b6a4947 AM |
15159 | +#define fi_read_trylock_nested(f) \ |
15160 | + au_rw_read_trylock_nested(&au_fi(f)->fi_rwsem) | |
15161 | +#define fi_write_trylock_nested(f) \ | |
15162 | + au_rw_write_trylock_nested(&au_fi(f)->fi_rwsem) | |
15163 | +*/ | |
15164 | + | |
15165 | +#define fi_read_unlock(f) au_rw_read_unlock(&au_fi(f)->fi_rwsem) | |
15166 | +#define fi_write_unlock(f) au_rw_write_unlock(&au_fi(f)->fi_rwsem) | |
15167 | +#define fi_downgrade_lock(f) au_rw_dgrade_lock(&au_fi(f)->fi_rwsem) | |
1308ab2a | 15168 | + |
521ced18 JR |
15169 | +/* lock subclass for finfo */ |
15170 | +enum { | |
15171 | + AuLsc_FI_1, | |
15172 | + AuLsc_FI_2 | |
15173 | +}; | |
15174 | + | |
15175 | +static inline void fi_read_lock_nested(struct file *f, unsigned int lsc) | |
15176 | +{ | |
15177 | + au_rw_read_lock_nested(&au_fi(f)->fi_rwsem, lsc); | |
15178 | +} | |
15179 | + | |
15180 | +static inline void fi_write_lock_nested(struct file *f, unsigned int lsc) | |
15181 | +{ | |
15182 | + au_rw_write_lock_nested(&au_fi(f)->fi_rwsem, lsc); | |
15183 | +} | |
15184 | + | |
15185 | +/* | |
15186 | + * fi_read_lock_1, fi_write_lock_1, | |
15187 | + * fi_read_lock_2, fi_write_lock_2 | |
15188 | + */ | |
15189 | +#define AuReadLockFunc(name) \ | |
15190 | +static inline void fi_read_lock_##name(struct file *f) \ | |
15191 | +{ fi_read_lock_nested(f, AuLsc_FI_##name); } | |
15192 | + | |
15193 | +#define AuWriteLockFunc(name) \ | |
15194 | +static inline void fi_write_lock_##name(struct file *f) \ | |
15195 | +{ fi_write_lock_nested(f, AuLsc_FI_##name); } | |
15196 | + | |
15197 | +#define AuRWLockFuncs(name) \ | |
15198 | + AuReadLockFunc(name) \ | |
15199 | + AuWriteLockFunc(name) | |
15200 | + | |
15201 | +AuRWLockFuncs(1); | |
15202 | +AuRWLockFuncs(2); | |
15203 | + | |
15204 | +#undef AuReadLockFunc | |
15205 | +#undef AuWriteLockFunc | |
15206 | +#undef AuRWLockFuncs | |
15207 | + | |
4a4d8108 AM |
15208 | +#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem) |
15209 | +#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem) | |
15210 | +#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem) | |
1facf9fc | 15211 | + |
1308ab2a | 15212 | +/* ---------------------------------------------------------------------- */ |
15213 | + | |
4a4d8108 | 15214 | +/* todo: hard/soft set? */ |
5afbbe0d | 15215 | +static inline aufs_bindex_t au_fbtop(struct file *file) |
dece6358 | 15216 | +{ |
4a4d8108 AM |
15217 | + FiMustAnyLock(file); |
15218 | + return au_fi(file)->fi_btop; | |
15219 | +} | |
dece6358 | 15220 | + |
5afbbe0d | 15221 | +static inline aufs_bindex_t au_fbbot_dir(struct file *file) |
4a4d8108 AM |
15222 | +{ |
15223 | + FiMustAnyLock(file); | |
15224 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15225 | + return au_fi(file)->fi_hdir->fd_bbot; | |
15226 | +} | |
1facf9fc | 15227 | + |
4a4d8108 AM |
15228 | +static inline struct au_vdir *au_fvdir_cache(struct file *file) |
15229 | +{ | |
15230 | + FiMustAnyLock(file); | |
15231 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15232 | + return au_fi(file)->fi_hdir->fd_vdir_cache; | |
15233 | +} | |
1facf9fc | 15234 | + |
5afbbe0d | 15235 | +static inline void au_set_fbtop(struct file *file, aufs_bindex_t bindex) |
4a4d8108 AM |
15236 | +{ |
15237 | + FiMustWriteLock(file); | |
15238 | + au_fi(file)->fi_btop = bindex; | |
15239 | +} | |
1facf9fc | 15240 | + |
5afbbe0d | 15241 | +static inline void au_set_fbbot_dir(struct file *file, aufs_bindex_t bindex) |
4a4d8108 AM |
15242 | +{ |
15243 | + FiMustWriteLock(file); | |
15244 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15245 | + au_fi(file)->fi_hdir->fd_bbot = bindex; | |
15246 | +} | |
1308ab2a | 15247 | + |
4a4d8108 AM |
15248 | +static inline void au_set_fvdir_cache(struct file *file, |
15249 | + struct au_vdir *vdir_cache) | |
15250 | +{ | |
15251 | + FiMustWriteLock(file); | |
15252 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15253 | + au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache; | |
15254 | +} | |
dece6358 | 15255 | + |
4a4d8108 AM |
15256 | +static inline struct file *au_hf_top(struct file *file) |
15257 | +{ | |
15258 | + FiMustAnyLock(file); | |
15259 | + AuDebugOn(au_fi(file)->fi_hdir); | |
15260 | + return au_fi(file)->fi_htop.hf_file; | |
15261 | +} | |
1facf9fc | 15262 | + |
4a4d8108 AM |
15263 | +static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex) |
15264 | +{ | |
15265 | + FiMustAnyLock(file); | |
15266 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15267 | + return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file; | |
dece6358 AM |
15268 | +} |
15269 | + | |
4a4d8108 AM |
15270 | +/* todo: memory barrier? */ |
15271 | +static inline unsigned int au_figen(struct file *f) | |
dece6358 | 15272 | +{ |
4a4d8108 AM |
15273 | + return atomic_read(&au_fi(f)->fi_generation); |
15274 | +} | |
dece6358 | 15275 | + |
2cbb1c4b JR |
15276 | +static inline void au_set_mmapped(struct file *f) |
15277 | +{ | |
15278 | + if (atomic_inc_return(&au_fi(f)->fi_mmapped)) | |
15279 | + return; | |
0c3ec466 | 15280 | + pr_warn("fi_mmapped wrapped around\n"); |
2cbb1c4b JR |
15281 | + while (!atomic_inc_return(&au_fi(f)->fi_mmapped)) |
15282 | + ; | |
15283 | +} | |
15284 | + | |
15285 | +static inline void au_unset_mmapped(struct file *f) | |
15286 | +{ | |
15287 | + atomic_dec(&au_fi(f)->fi_mmapped); | |
15288 | +} | |
15289 | + | |
4a4d8108 AM |
15290 | +static inline int au_test_mmapped(struct file *f) |
15291 | +{ | |
2cbb1c4b JR |
15292 | + return atomic_read(&au_fi(f)->fi_mmapped); |
15293 | +} | |
15294 | + | |
15295 | +/* customize vma->vm_file */ | |
15296 | + | |
15297 | +static inline void au_do_vm_file_reset(struct vm_area_struct *vma, | |
15298 | + struct file *file) | |
15299 | +{ | |
53392da6 AM |
15300 | + struct file *f; |
15301 | + | |
15302 | + f = vma->vm_file; | |
2cbb1c4b JR |
15303 | + get_file(file); |
15304 | + vma->vm_file = file; | |
53392da6 | 15305 | + fput(f); |
2cbb1c4b JR |
15306 | +} |
15307 | + | |
15308 | +#ifdef CONFIG_MMU | |
15309 | +#define AuDbgVmRegion(file, vma) do {} while (0) | |
15310 | + | |
15311 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
15312 | + struct file *file) | |
15313 | +{ | |
15314 | + au_do_vm_file_reset(vma, file); | |
15315 | +} | |
15316 | +#else | |
15317 | +#define AuDbgVmRegion(file, vma) \ | |
15318 | + AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file)) | |
15319 | + | |
15320 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
15321 | + struct file *file) | |
15322 | +{ | |
53392da6 AM |
15323 | + struct file *f; |
15324 | + | |
2cbb1c4b | 15325 | + au_do_vm_file_reset(vma, file); |
53392da6 | 15326 | + f = vma->vm_region->vm_file; |
2cbb1c4b JR |
15327 | + get_file(file); |
15328 | + vma->vm_region->vm_file = file; | |
53392da6 | 15329 | + fput(f); |
2cbb1c4b JR |
15330 | +} |
15331 | +#endif /* CONFIG_MMU */ | |
15332 | + | |
15333 | +/* handle vma->vm_prfile */ | |
fb47a38f | 15334 | +static inline void au_vm_prfile_set(struct vm_area_struct *vma, |
2cbb1c4b JR |
15335 | + struct file *file) |
15336 | +{ | |
2cbb1c4b JR |
15337 | + get_file(file); |
15338 | + vma->vm_prfile = file; | |
15339 | +#ifndef CONFIG_MMU | |
15340 | + get_file(file); | |
15341 | + vma->vm_region->vm_prfile = file; | |
15342 | +#endif | |
fb47a38f | 15343 | +} |
1308ab2a | 15344 | + |
4a4d8108 AM |
15345 | +#endif /* __KERNEL__ */ |
15346 | +#endif /* __AUFS_FILE_H__ */ | |
7f207e10 | 15347 | diff -urN /usr/share/empty/fs/aufs/finfo.c linux/fs/aufs/finfo.c |
eca34b5c | 15348 | --- /usr/share/empty/fs/aufs/finfo.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 15349 | +++ linux/fs/aufs/finfo.c 2020-01-27 10:57:18.172204883 +0100 |
062440b3 | 15350 | @@ -0,0 +1,149 @@ |
cd7a4cd9 | 15351 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 15352 | +/* |
016522bc | 15353 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
15354 | + * |
15355 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15356 | + * it under the terms of the GNU General Public License as published by | |
15357 | + * the Free Software Foundation; either version 2 of the License, or | |
15358 | + * (at your option) any later version. | |
15359 | + * | |
15360 | + * This program is distributed in the hope that it will be useful, | |
15361 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15362 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15363 | + * GNU General Public License for more details. | |
15364 | + * | |
15365 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15366 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 15367 | + */ |
1308ab2a | 15368 | + |
4a4d8108 AM |
15369 | +/* |
15370 | + * file private data | |
15371 | + */ | |
1facf9fc | 15372 | + |
4a4d8108 | 15373 | +#include "aufs.h" |
1facf9fc | 15374 | + |
f0c0a007 | 15375 | +void au_hfput(struct au_hfile *hf, int execed) |
4a4d8108 | 15376 | +{ |
f0c0a007 | 15377 | + if (execed) |
4a4d8108 AM |
15378 | + allow_write_access(hf->hf_file); |
15379 | + fput(hf->hf_file); | |
15380 | + hf->hf_file = NULL; | |
acd2b654 | 15381 | + au_lcnt_dec(&hf->hf_br->br_nfiles); |
4a4d8108 AM |
15382 | + hf->hf_br = NULL; |
15383 | +} | |
1facf9fc | 15384 | + |
4a4d8108 AM |
15385 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val) |
15386 | +{ | |
15387 | + struct au_finfo *finfo = au_fi(file); | |
15388 | + struct au_hfile *hf; | |
15389 | + struct au_fidir *fidir; | |
15390 | + | |
15391 | + fidir = finfo->fi_hdir; | |
15392 | + if (!fidir) { | |
15393 | + AuDebugOn(finfo->fi_btop != bindex); | |
15394 | + hf = &finfo->fi_htop; | |
15395 | + } else | |
15396 | + hf = fidir->fd_hfile + bindex; | |
15397 | + | |
15398 | + if (hf && hf->hf_file) | |
f0c0a007 | 15399 | + au_hfput(hf, vfsub_file_execed(file)); |
4a4d8108 AM |
15400 | + if (val) { |
15401 | + FiMustWriteLock(file); | |
b912730e | 15402 | + AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry)); |
4a4d8108 | 15403 | + hf->hf_file = val; |
2000de60 | 15404 | + hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex); |
1308ab2a | 15405 | + } |
4a4d8108 | 15406 | +} |
1facf9fc | 15407 | + |
4a4d8108 AM |
15408 | +void au_update_figen(struct file *file) |
15409 | +{ | |
2000de60 | 15410 | + atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry)); |
4a4d8108 | 15411 | + /* smp_mb(); */ /* atomic_set */ |
1facf9fc | 15412 | +} |
15413 | + | |
4a4d8108 AM |
15414 | +/* ---------------------------------------------------------------------- */ |
15415 | + | |
4a4d8108 AM |
15416 | +struct au_fidir *au_fidir_alloc(struct super_block *sb) |
15417 | +{ | |
15418 | + struct au_fidir *fidir; | |
15419 | + int nbr; | |
15420 | + | |
5afbbe0d | 15421 | + nbr = au_sbbot(sb) + 1; |
4a4d8108 AM |
15422 | + if (nbr < 2) |
15423 | + nbr = 2; /* initial allocate for 2 branches */ | |
15424 | + fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS); | |
15425 | + if (fidir) { | |
15426 | + fidir->fd_bbot = -1; | |
15427 | + fidir->fd_nent = nbr; | |
4a4d8108 AM |
15428 | + } |
15429 | + | |
15430 | + return fidir; | |
15431 | +} | |
15432 | + | |
e2f27e51 | 15433 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink) |
4a4d8108 AM |
15434 | +{ |
15435 | + int err; | |
15436 | + struct au_fidir *fidir, *p; | |
15437 | + | |
15438 | + AuRwMustWriteLock(&finfo->fi_rwsem); | |
15439 | + fidir = finfo->fi_hdir; | |
15440 | + AuDebugOn(!fidir); | |
15441 | + | |
15442 | + err = -ENOMEM; | |
15443 | + p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr), | |
e2f27e51 | 15444 | + GFP_NOFS, may_shrink); |
4a4d8108 AM |
15445 | + if (p) { |
15446 | + p->fd_nent = nbr; | |
15447 | + finfo->fi_hdir = p; | |
15448 | + err = 0; | |
15449 | + } | |
1facf9fc | 15450 | + |
dece6358 | 15451 | + return err; |
1facf9fc | 15452 | +} |
1308ab2a | 15453 | + |
15454 | +/* ---------------------------------------------------------------------- */ | |
15455 | + | |
1c60b727 | 15456 | +void au_finfo_fin(struct file *file) |
1308ab2a | 15457 | +{ |
4a4d8108 AM |
15458 | + struct au_finfo *finfo; |
15459 | + | |
acd2b654 | 15460 | + au_lcnt_dec(&au_sbi(file->f_path.dentry->d_sb)->si_nfiles); |
7f207e10 | 15461 | + |
4a4d8108 AM |
15462 | + finfo = au_fi(file); |
15463 | + AuDebugOn(finfo->fi_hdir); | |
15464 | + AuRwDestroy(&finfo->fi_rwsem); | |
1c60b727 | 15465 | + au_cache_free_finfo(finfo); |
1308ab2a | 15466 | +} |
1308ab2a | 15467 | + |
e49829fe | 15468 | +void au_fi_init_once(void *_finfo) |
4a4d8108 | 15469 | +{ |
e49829fe | 15470 | + struct au_finfo *finfo = _finfo; |
1308ab2a | 15471 | + |
e49829fe | 15472 | + au_rw_init(&finfo->fi_rwsem); |
4a4d8108 | 15473 | +} |
1308ab2a | 15474 | + |
4a4d8108 AM |
15475 | +int au_finfo_init(struct file *file, struct au_fidir *fidir) |
15476 | +{ | |
1716fcea | 15477 | + int err; |
4a4d8108 AM |
15478 | + struct au_finfo *finfo; |
15479 | + struct dentry *dentry; | |
15480 | + | |
15481 | + err = -ENOMEM; | |
2000de60 | 15482 | + dentry = file->f_path.dentry; |
4a4d8108 AM |
15483 | + finfo = au_cache_alloc_finfo(); |
15484 | + if (unlikely(!finfo)) | |
15485 | + goto out; | |
15486 | + | |
15487 | + err = 0; | |
acd2b654 | 15488 | + au_lcnt_inc(&au_sbi(dentry->d_sb)->si_nfiles); |
4a4d8108 AM |
15489 | + au_rw_write_lock(&finfo->fi_rwsem); |
15490 | + finfo->fi_btop = -1; | |
15491 | + finfo->fi_hdir = fidir; | |
15492 | + atomic_set(&finfo->fi_generation, au_digen(dentry)); | |
15493 | + /* smp_mb(); */ /* atomic_set */ | |
15494 | + | |
15495 | + file->private_data = finfo; | |
15496 | + | |
15497 | +out: | |
15498 | + return err; | |
15499 | +} | |
7f207e10 | 15500 | diff -urN /usr/share/empty/fs/aufs/f_op.c linux/fs/aufs/f_op.c |
eca34b5c | 15501 | --- /usr/share/empty/fs/aufs/f_op.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 15502 | +++ linux/fs/aufs/f_op.c 2020-01-27 10:57:18.172204883 +0100 |
acd2b654 | 15503 | @@ -0,0 +1,819 @@ |
cd7a4cd9 | 15504 | +// SPDX-License-Identifier: GPL-2.0 |
dece6358 | 15505 | +/* |
016522bc | 15506 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
dece6358 AM |
15507 | + * |
15508 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15509 | + * it under the terms of the GNU General Public License as published by | |
15510 | + * the Free Software Foundation; either version 2 of the License, or | |
15511 | + * (at your option) any later version. | |
15512 | + * | |
15513 | + * This program is distributed in the hope that it will be useful, | |
15514 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15515 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15516 | + * GNU General Public License for more details. | |
15517 | + * | |
15518 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15519 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 | 15520 | + */ |
1facf9fc | 15521 | + |
15522 | +/* | |
4a4d8108 | 15523 | + * file and vm operations |
1facf9fc | 15524 | + */ |
dece6358 | 15525 | + |
86dc4139 | 15526 | +#include <linux/aio.h> |
4a4d8108 AM |
15527 | +#include <linux/fs_stack.h> |
15528 | +#include <linux/mman.h> | |
4a4d8108 | 15529 | +#include <linux/security.h> |
dece6358 AM |
15530 | +#include "aufs.h" |
15531 | + | |
b912730e | 15532 | +int au_do_open_nondir(struct file *file, int flags, struct file *h_file) |
1facf9fc | 15533 | +{ |
4a4d8108 AM |
15534 | + int err; |
15535 | + aufs_bindex_t bindex; | |
8cdd5066 | 15536 | + struct dentry *dentry, *h_dentry; |
4a4d8108 | 15537 | + struct au_finfo *finfo; |
38d290e6 | 15538 | + struct inode *h_inode; |
4a4d8108 AM |
15539 | + |
15540 | + FiMustWriteLock(file); | |
15541 | + | |
523b37e3 | 15542 | + err = 0; |
2000de60 | 15543 | + dentry = file->f_path.dentry; |
b912730e | 15544 | + AuDebugOn(IS_ERR_OR_NULL(dentry)); |
4a4d8108 AM |
15545 | + finfo = au_fi(file); |
15546 | + memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop)); | |
2cbb1c4b | 15547 | + atomic_set(&finfo->fi_mmapped, 0); |
5afbbe0d | 15548 | + bindex = au_dbtop(dentry); |
8cdd5066 JR |
15549 | + if (!h_file) { |
15550 | + h_dentry = au_h_dptr(dentry, bindex); | |
15551 | + err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); | |
15552 | + if (unlikely(err)) | |
15553 | + goto out; | |
b912730e | 15554 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
acd2b654 AM |
15555 | + if (IS_ERR(h_file)) { |
15556 | + err = PTR_ERR(h_file); | |
15557 | + goto out; | |
15558 | + } | |
8cdd5066 JR |
15559 | + } else { |
15560 | + h_dentry = h_file->f_path.dentry; | |
15561 | + err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); | |
15562 | + if (unlikely(err)) | |
15563 | + goto out; | |
acd2b654 | 15564 | + /* br ref is already inc-ed */ |
8cdd5066 | 15565 | + } |
acd2b654 AM |
15566 | + |
15567 | + if ((flags & __O_TMPFILE) | |
15568 | + && !(flags & O_EXCL)) { | |
15569 | + h_inode = file_inode(h_file); | |
15570 | + spin_lock(&h_inode->i_lock); | |
15571 | + h_inode->i_state |= I_LINKABLE; | |
15572 | + spin_unlock(&h_inode->i_lock); | |
4a4d8108 | 15573 | + } |
acd2b654 AM |
15574 | + au_set_fbtop(file, bindex); |
15575 | + au_set_h_fptr(file, bindex, h_file); | |
15576 | + au_update_figen(file); | |
15577 | + /* todo: necessary? */ | |
15578 | + /* file->f_ra = h_file->f_ra; */ | |
027c5e7a | 15579 | + |
8cdd5066 | 15580 | +out: |
4a4d8108 | 15581 | + return err; |
1facf9fc | 15582 | +} |
15583 | + | |
4a4d8108 AM |
15584 | +static int aufs_open_nondir(struct inode *inode __maybe_unused, |
15585 | + struct file *file) | |
1facf9fc | 15586 | +{ |
4a4d8108 | 15587 | + int err; |
1308ab2a | 15588 | + struct super_block *sb; |
b912730e AM |
15589 | + struct au_do_open_args args = { |
15590 | + .open = au_do_open_nondir | |
15591 | + }; | |
1facf9fc | 15592 | + |
523b37e3 AM |
15593 | + AuDbg("%pD, f_flags 0x%x, f_mode 0x%x\n", |
15594 | + file, vfsub_file_flags(file), file->f_mode); | |
1facf9fc | 15595 | + |
2000de60 | 15596 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 | 15597 | + si_read_lock(sb, AuLock_FLUSH); |
b912730e | 15598 | + err = au_do_open(file, &args); |
4a4d8108 AM |
15599 | + si_read_unlock(sb); |
15600 | + return err; | |
15601 | +} | |
1facf9fc | 15602 | + |
4a4d8108 AM |
15603 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file) |
15604 | +{ | |
15605 | + struct au_finfo *finfo; | |
15606 | + aufs_bindex_t bindex; | |
1facf9fc | 15607 | + |
4a4d8108 | 15608 | + finfo = au_fi(file); |
8b6a4947 AM |
15609 | + au_hbl_del(&finfo->fi_hlist, |
15610 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
4a4d8108 | 15611 | + bindex = finfo->fi_btop; |
b4510431 | 15612 | + if (bindex >= 0) |
4a4d8108 | 15613 | + au_set_h_fptr(file, bindex, NULL); |
7f207e10 | 15614 | + |
1c60b727 | 15615 | + au_finfo_fin(file); |
4a4d8108 | 15616 | + return 0; |
1facf9fc | 15617 | +} |
15618 | + | |
4a4d8108 AM |
15619 | +/* ---------------------------------------------------------------------- */ |
15620 | + | |
15621 | +static int au_do_flush_nondir(struct file *file, fl_owner_t id) | |
dece6358 | 15622 | +{ |
1308ab2a | 15623 | + int err; |
4a4d8108 AM |
15624 | + struct file *h_file; |
15625 | + | |
15626 | + err = 0; | |
15627 | + h_file = au_hf_top(file); | |
15628 | + if (h_file) | |
15629 | + err = vfsub_flush(h_file, id); | |
15630 | + return err; | |
15631 | +} | |
15632 | + | |
15633 | +static int aufs_flush_nondir(struct file *file, fl_owner_t id) | |
15634 | +{ | |
15635 | + return au_do_flush(file, id, au_do_flush_nondir); | |
15636 | +} | |
15637 | + | |
15638 | +/* ---------------------------------------------------------------------- */ | |
9dbd164d AM |
15639 | +/* |
15640 | + * read and write functions acquire [fdi]_rwsem once, but release before | |
15641 | + * mmap_sem. This is because to stop a race condition between mmap(2). | |
acd2b654 | 15642 | + * Releasing these aufs-rwsem should be safe, no branch-management (by keeping |
9dbd164d AM |
15643 | + * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in |
15644 | + * read functions after [fdi]_rwsem are released, but it should be harmless. | |
15645 | + */ | |
4a4d8108 | 15646 | + |
b912730e | 15647 | +/* Callers should call au_read_post() or fput() in the end */ |
521ced18 | 15648 | +struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc) |
4a4d8108 | 15649 | +{ |
4a4d8108 | 15650 | + struct file *h_file; |
b912730e | 15651 | + int err; |
1facf9fc | 15652 | + |
521ced18 | 15653 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0, lsc); |
b912730e AM |
15654 | + if (!err) { |
15655 | + di_read_unlock(file->f_path.dentry, AuLock_IR); | |
15656 | + h_file = au_hf_top(file); | |
15657 | + get_file(h_file); | |
15658 | + if (!keep_fi) | |
15659 | + fi_read_unlock(file); | |
15660 | + } else | |
15661 | + h_file = ERR_PTR(err); | |
15662 | + | |
15663 | + return h_file; | |
15664 | +} | |
15665 | + | |
15666 | +static void au_read_post(struct inode *inode, struct file *h_file) | |
15667 | +{ | |
15668 | + /* update without lock, I don't think it a problem */ | |
15669 | + fsstack_copy_attr_atime(inode, file_inode(h_file)); | |
15670 | + fput(h_file); | |
15671 | +} | |
15672 | + | |
15673 | +struct au_write_pre { | |
521ced18 JR |
15674 | + /* input */ |
15675 | + unsigned int lsc; | |
15676 | + | |
15677 | + /* output */ | |
b912730e | 15678 | + blkcnt_t blks; |
5afbbe0d | 15679 | + aufs_bindex_t btop; |
b912730e AM |
15680 | +}; |
15681 | + | |
15682 | +/* | |
15683 | + * return with iinfo is write-locked | |
15684 | + * callers should call au_write_post() or iinfo_write_unlock() + fput() in the | |
15685 | + * end | |
15686 | + */ | |
15687 | +static struct file *au_write_pre(struct file *file, int do_ready, | |
15688 | + struct au_write_pre *wpre) | |
15689 | +{ | |
15690 | + struct file *h_file; | |
15691 | + struct dentry *dentry; | |
15692 | + int err; | |
521ced18 | 15693 | + unsigned int lsc; |
b912730e AM |
15694 | + struct au_pin pin; |
15695 | + | |
521ced18 JR |
15696 | + lsc = 0; |
15697 | + if (wpre) | |
15698 | + lsc = wpre->lsc; | |
15699 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, lsc); | |
b912730e | 15700 | + h_file = ERR_PTR(err); |
dece6358 AM |
15701 | + if (unlikely(err)) |
15702 | + goto out; | |
1facf9fc | 15703 | + |
b912730e AM |
15704 | + dentry = file->f_path.dentry; |
15705 | + if (do_ready) { | |
15706 | + err = au_ready_to_write(file, -1, &pin); | |
15707 | + if (unlikely(err)) { | |
15708 | + h_file = ERR_PTR(err); | |
15709 | + di_write_unlock(dentry); | |
15710 | + goto out_fi; | |
15711 | + } | |
15712 | + } | |
15713 | + | |
15714 | + di_downgrade_lock(dentry, /*flags*/0); | |
15715 | + if (wpre) | |
5afbbe0d | 15716 | + wpre->btop = au_fbtop(file); |
4a4d8108 | 15717 | + h_file = au_hf_top(file); |
9dbd164d | 15718 | + get_file(h_file); |
b912730e AM |
15719 | + if (wpre) |
15720 | + wpre->blks = file_inode(h_file)->i_blocks; | |
15721 | + if (do_ready) | |
15722 | + au_unpin(&pin); | |
15723 | + di_read_unlock(dentry, /*flags*/0); | |
15724 | + | |
15725 | +out_fi: | |
15726 | + fi_write_unlock(file); | |
15727 | +out: | |
15728 | + return h_file; | |
15729 | +} | |
15730 | + | |
15731 | +static void au_write_post(struct inode *inode, struct file *h_file, | |
15732 | + struct au_write_pre *wpre, ssize_t written) | |
15733 | +{ | |
15734 | + struct inode *h_inode; | |
15735 | + | |
15736 | + au_cpup_attr_timesizes(inode); | |
5afbbe0d | 15737 | + AuDebugOn(au_ibtop(inode) != wpre->btop); |
b912730e AM |
15738 | + h_inode = file_inode(h_file); |
15739 | + inode->i_mode = h_inode->i_mode; | |
15740 | + ii_write_unlock(inode); | |
b912730e AM |
15741 | + /* AuDbg("blks %llu, %llu\n", (u64)blks, (u64)h_inode->i_blocks); */ |
15742 | + if (written > 0) | |
5afbbe0d | 15743 | + au_fhsm_wrote(inode->i_sb, wpre->btop, |
b912730e | 15744 | + /*force*/h_inode->i_blocks > wpre->blks); |
1c60b727 | 15745 | + fput(h_file); |
b912730e AM |
15746 | +} |
15747 | + | |
15748 | +static ssize_t aufs_read(struct file *file, char __user *buf, size_t count, | |
15749 | + loff_t *ppos) | |
15750 | +{ | |
15751 | + ssize_t err; | |
15752 | + struct inode *inode; | |
15753 | + struct file *h_file; | |
15754 | + struct super_block *sb; | |
15755 | + | |
15756 | + inode = file_inode(file); | |
15757 | + sb = inode->i_sb; | |
15758 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); | |
15759 | + | |
521ced18 | 15760 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
15761 | + err = PTR_ERR(h_file); |
15762 | + if (IS_ERR(h_file)) | |
15763 | + goto out; | |
9dbd164d AM |
15764 | + |
15765 | + /* filedata may be obsoleted by concurrent copyup, but no problem */ | |
4a4d8108 AM |
15766 | + err = vfsub_read_u(h_file, buf, count, ppos); |
15767 | + /* todo: necessary? */ | |
15768 | + /* file->f_ra = h_file->f_ra; */ | |
b912730e | 15769 | + au_read_post(inode, h_file); |
1308ab2a | 15770 | + |
4f0767ce | 15771 | +out: |
dece6358 AM |
15772 | + si_read_unlock(sb); |
15773 | + return err; | |
15774 | +} | |
1facf9fc | 15775 | + |
e49829fe JR |
15776 | +/* |
15777 | + * todo: very ugly | |
15778 | + * it locks both of i_mutex and si_rwsem for read in safe. | |
15779 | + * if the plink maintenance mode continues forever (that is the problem), | |
15780 | + * may loop forever. | |
15781 | + */ | |
15782 | +static void au_mtx_and_read_lock(struct inode *inode) | |
15783 | +{ | |
15784 | + int err; | |
15785 | + struct super_block *sb = inode->i_sb; | |
15786 | + | |
15787 | + while (1) { | |
febd17d6 | 15788 | + inode_lock(inode); |
e49829fe JR |
15789 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
15790 | + if (!err) | |
15791 | + break; | |
febd17d6 | 15792 | + inode_unlock(inode); |
e49829fe JR |
15793 | + si_read_lock(sb, AuLock_NOPLMW); |
15794 | + si_read_unlock(sb); | |
15795 | + } | |
15796 | +} | |
15797 | + | |
4a4d8108 AM |
15798 | +static ssize_t aufs_write(struct file *file, const char __user *ubuf, |
15799 | + size_t count, loff_t *ppos) | |
dece6358 | 15800 | +{ |
4a4d8108 | 15801 | + ssize_t err; |
b912730e AM |
15802 | + struct au_write_pre wpre; |
15803 | + struct inode *inode; | |
4a4d8108 AM |
15804 | + struct file *h_file; |
15805 | + char __user *buf = (char __user *)ubuf; | |
1facf9fc | 15806 | + |
b912730e | 15807 | + inode = file_inode(file); |
e49829fe | 15808 | + au_mtx_and_read_lock(inode); |
1facf9fc | 15809 | + |
521ced18 | 15810 | + wpre.lsc = 0; |
b912730e AM |
15811 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15812 | + err = PTR_ERR(h_file); | |
15813 | + if (IS_ERR(h_file)) | |
9dbd164d | 15814 | + goto out; |
9dbd164d | 15815 | + |
4a4d8108 | 15816 | + err = vfsub_write_u(h_file, buf, count, ppos); |
b912730e | 15817 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 15818 | + |
4f0767ce | 15819 | +out: |
b912730e | 15820 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15821 | + inode_unlock(inode); |
dece6358 AM |
15822 | + return err; |
15823 | +} | |
1facf9fc | 15824 | + |
076b876e AM |
15825 | +static ssize_t au_do_iter(struct file *h_file, int rw, struct kiocb *kio, |
15826 | + struct iov_iter *iov_iter) | |
dece6358 | 15827 | +{ |
4a4d8108 AM |
15828 | + ssize_t err; |
15829 | + struct file *file; | |
076b876e | 15830 | + ssize_t (*iter)(struct kiocb *, struct iov_iter *); |
1facf9fc | 15831 | + |
4a4d8108 AM |
15832 | + err = security_file_permission(h_file, rw); |
15833 | + if (unlikely(err)) | |
15834 | + goto out; | |
1facf9fc | 15835 | + |
43982f53 | 15836 | + err = -ENOSYS; /* the branch doesn't have its ->(read|write)_iter() */ |
076b876e | 15837 | + iter = NULL; |
5527c038 | 15838 | + if (rw == MAY_READ) |
076b876e | 15839 | + iter = h_file->f_op->read_iter; |
5527c038 | 15840 | + else if (rw == MAY_WRITE) |
076b876e | 15841 | + iter = h_file->f_op->write_iter; |
076b876e AM |
15842 | + |
15843 | + file = kio->ki_filp; | |
15844 | + kio->ki_filp = h_file; | |
15845 | + if (iter) { | |
2cbb1c4b | 15846 | + lockdep_off(); |
076b876e AM |
15847 | + err = iter(kio, iov_iter); |
15848 | + lockdep_on(); | |
4a4d8108 AM |
15849 | + } else |
15850 | + /* currently there is no such fs */ | |
15851 | + WARN_ON_ONCE(1); | |
076b876e | 15852 | + kio->ki_filp = file; |
1facf9fc | 15853 | + |
4f0767ce | 15854 | +out: |
dece6358 AM |
15855 | + return err; |
15856 | +} | |
1facf9fc | 15857 | + |
076b876e | 15858 | +static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
1facf9fc | 15859 | +{ |
4a4d8108 AM |
15860 | + ssize_t err; |
15861 | + struct file *file, *h_file; | |
b912730e | 15862 | + struct inode *inode; |
dece6358 | 15863 | + struct super_block *sb; |
1facf9fc | 15864 | + |
4a4d8108 | 15865 | + file = kio->ki_filp; |
b912730e AM |
15866 | + inode = file_inode(file); |
15867 | + sb = inode->i_sb; | |
e49829fe | 15868 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 | 15869 | + |
521ced18 | 15870 | + h_file = au_read_pre(file, /*keep_fi*/1, /*lsc*/0); |
b912730e AM |
15871 | + err = PTR_ERR(h_file); |
15872 | + if (IS_ERR(h_file)) | |
15873 | + goto out; | |
9dbd164d | 15874 | + |
5afbbe0d AM |
15875 | + if (au_test_loopback_kthread()) { |
15876 | + au_warn_loopback(h_file->f_path.dentry->d_sb); | |
15877 | + if (file->f_mapping != h_file->f_mapping) { | |
15878 | + file->f_mapping = h_file->f_mapping; | |
15879 | + smp_mb(); /* unnecessary? */ | |
15880 | + } | |
15881 | + } | |
15882 | + fi_read_unlock(file); | |
15883 | + | |
076b876e | 15884 | + err = au_do_iter(h_file, MAY_READ, kio, iov_iter); |
4a4d8108 AM |
15885 | + /* todo: necessary? */ |
15886 | + /* file->f_ra = h_file->f_ra; */ | |
b912730e | 15887 | + au_read_post(inode, h_file); |
1facf9fc | 15888 | + |
4f0767ce | 15889 | +out: |
4a4d8108 | 15890 | + si_read_unlock(sb); |
1308ab2a | 15891 | + return err; |
15892 | +} | |
1facf9fc | 15893 | + |
076b876e | 15894 | +static ssize_t aufs_write_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
1308ab2a | 15895 | +{ |
4a4d8108 | 15896 | + ssize_t err; |
b912730e AM |
15897 | + struct au_write_pre wpre; |
15898 | + struct inode *inode; | |
4a4d8108 | 15899 | + struct file *file, *h_file; |
1308ab2a | 15900 | + |
4a4d8108 | 15901 | + file = kio->ki_filp; |
b912730e | 15902 | + inode = file_inode(file); |
e49829fe JR |
15903 | + au_mtx_and_read_lock(inode); |
15904 | + | |
521ced18 | 15905 | + wpre.lsc = 0; |
b912730e AM |
15906 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15907 | + err = PTR_ERR(h_file); | |
15908 | + if (IS_ERR(h_file)) | |
9dbd164d | 15909 | + goto out; |
9dbd164d | 15910 | + |
076b876e | 15911 | + err = au_do_iter(h_file, MAY_WRITE, kio, iov_iter); |
b912730e | 15912 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 15913 | + |
4f0767ce | 15914 | +out: |
b912730e | 15915 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15916 | + inode_unlock(inode); |
dece6358 | 15917 | + return err; |
1facf9fc | 15918 | +} |
15919 | + | |
4a4d8108 AM |
15920 | +static ssize_t aufs_splice_read(struct file *file, loff_t *ppos, |
15921 | + struct pipe_inode_info *pipe, size_t len, | |
15922 | + unsigned int flags) | |
1facf9fc | 15923 | +{ |
4a4d8108 AM |
15924 | + ssize_t err; |
15925 | + struct file *h_file; | |
b912730e | 15926 | + struct inode *inode; |
dece6358 | 15927 | + struct super_block *sb; |
1facf9fc | 15928 | + |
b912730e AM |
15929 | + inode = file_inode(file); |
15930 | + sb = inode->i_sb; | |
e49829fe | 15931 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 15932 | + |
521ced18 | 15933 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
15934 | + err = PTR_ERR(h_file); |
15935 | + if (IS_ERR(h_file)) | |
dece6358 | 15936 | + goto out; |
1facf9fc | 15937 | + |
4a4d8108 | 15938 | + err = vfsub_splice_to(h_file, ppos, pipe, len, flags); |
acd2b654 | 15939 | + /* todo: necessary? */ |
4a4d8108 | 15940 | + /* file->f_ra = h_file->f_ra; */ |
b912730e | 15941 | + au_read_post(inode, h_file); |
1facf9fc | 15942 | + |
4f0767ce | 15943 | +out: |
4a4d8108 | 15944 | + si_read_unlock(sb); |
dece6358 | 15945 | + return err; |
1facf9fc | 15946 | +} |
15947 | + | |
4a4d8108 AM |
15948 | +static ssize_t |
15949 | +aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos, | |
15950 | + size_t len, unsigned int flags) | |
1facf9fc | 15951 | +{ |
4a4d8108 | 15952 | + ssize_t err; |
b912730e AM |
15953 | + struct au_write_pre wpre; |
15954 | + struct inode *inode; | |
076b876e | 15955 | + struct file *h_file; |
1facf9fc | 15956 | + |
b912730e | 15957 | + inode = file_inode(file); |
e49829fe | 15958 | + au_mtx_and_read_lock(inode); |
9dbd164d | 15959 | + |
521ced18 | 15960 | + wpre.lsc = 0; |
b912730e AM |
15961 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15962 | + err = PTR_ERR(h_file); | |
15963 | + if (IS_ERR(h_file)) | |
9dbd164d | 15964 | + goto out; |
9dbd164d | 15965 | + |
4a4d8108 | 15966 | + err = vfsub_splice_from(pipe, h_file, ppos, len, flags); |
b912730e | 15967 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 15968 | + |
4f0767ce | 15969 | +out: |
b912730e | 15970 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15971 | + inode_unlock(inode); |
4a4d8108 AM |
15972 | + return err; |
15973 | +} | |
1facf9fc | 15974 | + |
38d290e6 JR |
15975 | +static long aufs_fallocate(struct file *file, int mode, loff_t offset, |
15976 | + loff_t len) | |
15977 | +{ | |
15978 | + long err; | |
b912730e | 15979 | + struct au_write_pre wpre; |
38d290e6 JR |
15980 | + struct inode *inode; |
15981 | + struct file *h_file; | |
15982 | + | |
b912730e | 15983 | + inode = file_inode(file); |
38d290e6 JR |
15984 | + au_mtx_and_read_lock(inode); |
15985 | + | |
521ced18 | 15986 | + wpre.lsc = 0; |
b912730e AM |
15987 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15988 | + err = PTR_ERR(h_file); | |
15989 | + if (IS_ERR(h_file)) | |
38d290e6 | 15990 | + goto out; |
38d290e6 JR |
15991 | + |
15992 | + lockdep_off(); | |
03673fb0 | 15993 | + err = vfs_fallocate(h_file, mode, offset, len); |
38d290e6 | 15994 | + lockdep_on(); |
b912730e | 15995 | + au_write_post(inode, h_file, &wpre, /*written*/1); |
38d290e6 JR |
15996 | + |
15997 | +out: | |
b912730e | 15998 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15999 | + inode_unlock(inode); |
38d290e6 JR |
16000 | + return err; |
16001 | +} | |
16002 | + | |
521ced18 JR |
16003 | +static ssize_t aufs_copy_file_range(struct file *src, loff_t src_pos, |
16004 | + struct file *dst, loff_t dst_pos, | |
16005 | + size_t len, unsigned int flags) | |
16006 | +{ | |
16007 | + ssize_t err; | |
16008 | + struct au_write_pre wpre; | |
16009 | + enum { SRC, DST }; | |
16010 | + struct { | |
16011 | + struct inode *inode; | |
16012 | + struct file *h_file; | |
16013 | + struct super_block *h_sb; | |
16014 | + } a[2]; | |
16015 | +#define a_src a[SRC] | |
16016 | +#define a_dst a[DST] | |
16017 | + | |
16018 | + err = -EINVAL; | |
16019 | + a_src.inode = file_inode(src); | |
16020 | + if (unlikely(!S_ISREG(a_src.inode->i_mode))) | |
16021 | + goto out; | |
16022 | + a_dst.inode = file_inode(dst); | |
16023 | + if (unlikely(!S_ISREG(a_dst.inode->i_mode))) | |
16024 | + goto out; | |
16025 | + | |
16026 | + au_mtx_and_read_lock(a_dst.inode); | |
16027 | + /* | |
16028 | + * in order to match the order in di_write_lock2_{child,parent}(), | |
acd2b654 | 16029 | + * use f_path.dentry for this comparison. |
521ced18 JR |
16030 | + */ |
16031 | + if (src->f_path.dentry < dst->f_path.dentry) { | |
16032 | + a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_1); | |
16033 | + err = PTR_ERR(a_src.h_file); | |
16034 | + if (IS_ERR(a_src.h_file)) | |
16035 | + goto out_si; | |
16036 | + | |
16037 | + wpre.lsc = AuLsc_FI_2; | |
16038 | + a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); | |
16039 | + err = PTR_ERR(a_dst.h_file); | |
16040 | + if (IS_ERR(a_dst.h_file)) { | |
16041 | + au_read_post(a_src.inode, a_src.h_file); | |
16042 | + goto out_si; | |
16043 | + } | |
16044 | + } else { | |
16045 | + wpre.lsc = AuLsc_FI_1; | |
16046 | + a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); | |
16047 | + err = PTR_ERR(a_dst.h_file); | |
16048 | + if (IS_ERR(a_dst.h_file)) | |
16049 | + goto out_si; | |
16050 | + | |
16051 | + a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_2); | |
16052 | + err = PTR_ERR(a_src.h_file); | |
16053 | + if (IS_ERR(a_src.h_file)) { | |
16054 | + au_write_post(a_dst.inode, a_dst.h_file, &wpre, | |
16055 | + /*written*/0); | |
16056 | + goto out_si; | |
16057 | + } | |
16058 | + } | |
16059 | + | |
16060 | + err = -EXDEV; | |
16061 | + a_src.h_sb = file_inode(a_src.h_file)->i_sb; | |
16062 | + a_dst.h_sb = file_inode(a_dst.h_file)->i_sb; | |
16063 | + if (unlikely(a_src.h_sb != a_dst.h_sb)) { | |
16064 | + AuDbgFile(src); | |
16065 | + AuDbgFile(dst); | |
16066 | + goto out_file; | |
16067 | + } | |
16068 | + | |
16069 | + err = vfsub_copy_file_range(a_src.h_file, src_pos, a_dst.h_file, | |
16070 | + dst_pos, len, flags); | |
16071 | + | |
16072 | +out_file: | |
16073 | + au_write_post(a_dst.inode, a_dst.h_file, &wpre, err); | |
16074 | + fi_read_unlock(src); | |
16075 | + au_read_post(a_src.inode, a_src.h_file); | |
16076 | +out_si: | |
16077 | + si_read_unlock(a_dst.inode->i_sb); | |
16078 | + inode_unlock(a_dst.inode); | |
16079 | +out: | |
16080 | + return err; | |
16081 | +#undef a_src | |
16082 | +#undef a_dst | |
16083 | +} | |
16084 | + | |
4a4d8108 AM |
16085 | +/* ---------------------------------------------------------------------- */ |
16086 | + | |
9dbd164d AM |
16087 | +/* |
16088 | + * The locking order around current->mmap_sem. | |
16089 | + * - in most and regular cases | |
16090 | + * file I/O syscall -- aufs_read() or something | |
16091 | + * -- si_rwsem for read -- mmap_sem | |
16092 | + * (Note that [fdi]i_rwsem are released before mmap_sem). | |
16093 | + * - in mmap case | |
16094 | + * mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem | |
acd2b654 AM |
16095 | + * This AB-BA order is definitely bad, but is not a problem since "si_rwsem for |
16096 | + * read" allows multiple processes to acquire it and [fdi]i_rwsem are not held | |
16097 | + * in file I/O. Aufs needs to stop lockdep in aufs_mmap() though. | |
9dbd164d AM |
16098 | + * It means that when aufs acquires si_rwsem for write, the process should never |
16099 | + * acquire mmap_sem. | |
16100 | + * | |
392086de | 16101 | + * Actually aufs_iterate() holds [fdi]i_rwsem before mmap_sem, but this is not a |
9dbd164d AM |
16102 | + * problem either since any directory is not able to be mmap-ed. |
16103 | + * The similar scenario is applied to aufs_readlink() too. | |
16104 | + */ | |
16105 | + | |
38d290e6 | 16106 | +#if 0 /* stop calling security_file_mmap() */ |
2dfbb274 AM |
16107 | +/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */ |
16108 | +#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b) | |
16109 | + | |
16110 | +static unsigned long au_arch_prot_conv(unsigned long flags) | |
16111 | +{ | |
16112 | + /* currently ppc64 only */ | |
16113 | +#ifdef CONFIG_PPC64 | |
16114 | + /* cf. linux/arch/powerpc/include/asm/mman.h */ | |
16115 | + AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO); | |
16116 | + return AuConv_VM_PROT(flags, SAO); | |
16117 | +#else | |
16118 | + AuDebugOn(arch_calc_vm_prot_bits(-1)); | |
16119 | + return 0; | |
16120 | +#endif | |
16121 | +} | |
16122 | + | |
16123 | +static unsigned long au_prot_conv(unsigned long flags) | |
16124 | +{ | |
16125 | + return AuConv_VM_PROT(flags, READ) | |
16126 | + | AuConv_VM_PROT(flags, WRITE) | |
16127 | + | AuConv_VM_PROT(flags, EXEC) | |
16128 | + | au_arch_prot_conv(flags); | |
16129 | +} | |
16130 | + | |
16131 | +/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */ | |
16132 | +#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b) | |
16133 | + | |
16134 | +static unsigned long au_flag_conv(unsigned long flags) | |
16135 | +{ | |
16136 | + return AuConv_VM_MAP(flags, GROWSDOWN) | |
16137 | + | AuConv_VM_MAP(flags, DENYWRITE) | |
2dfbb274 AM |
16138 | + | AuConv_VM_MAP(flags, LOCKED); |
16139 | +} | |
38d290e6 | 16140 | +#endif |
2dfbb274 | 16141 | + |
9dbd164d | 16142 | +static int aufs_mmap(struct file *file, struct vm_area_struct *vma) |
dece6358 | 16143 | +{ |
4a4d8108 | 16144 | + int err; |
4a4d8108 | 16145 | + const unsigned char wlock |
9dbd164d | 16146 | + = (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED); |
4a4d8108 | 16147 | + struct super_block *sb; |
9dbd164d | 16148 | + struct file *h_file; |
b912730e | 16149 | + struct inode *inode; |
9dbd164d AM |
16150 | + |
16151 | + AuDbgVmRegion(file, vma); | |
1308ab2a | 16152 | + |
b912730e AM |
16153 | + inode = file_inode(file); |
16154 | + sb = inode->i_sb; | |
9dbd164d | 16155 | + lockdep_off(); |
e49829fe | 16156 | + si_read_lock(sb, AuLock_NOPLMW); |
4a4d8108 | 16157 | + |
b912730e | 16158 | + h_file = au_write_pre(file, wlock, /*wpre*/NULL); |
9dbd164d | 16159 | + lockdep_on(); |
b912730e AM |
16160 | + err = PTR_ERR(h_file); |
16161 | + if (IS_ERR(h_file)) | |
16162 | + goto out; | |
1308ab2a | 16163 | + |
b912730e AM |
16164 | + err = 0; |
16165 | + au_set_mmapped(file); | |
9dbd164d | 16166 | + au_vm_file_reset(vma, h_file); |
38d290e6 JR |
16167 | + /* |
16168 | + * we cannot call security_mmap_file() here since it may acquire | |
16169 | + * mmap_sem or i_mutex. | |
16170 | + * | |
16171 | + * err = security_mmap_file(h_file, au_prot_conv(vma->vm_flags), | |
16172 | + * au_flag_conv(vma->vm_flags)); | |
16173 | + */ | |
9dbd164d | 16174 | + if (!err) |
521ced18 | 16175 | + err = call_mmap(h_file, vma); |
b912730e AM |
16176 | + if (!err) { |
16177 | + au_vm_prfile_set(vma, file); | |
16178 | + fsstack_copy_attr_atime(inode, file_inode(h_file)); | |
16179 | + goto out_fput; /* success */ | |
16180 | + } | |
2cbb1c4b JR |
16181 | + au_unset_mmapped(file); |
16182 | + au_vm_file_reset(vma, file); | |
b912730e | 16183 | + |
2cbb1c4b | 16184 | +out_fput: |
9dbd164d | 16185 | + lockdep_off(); |
b912730e AM |
16186 | + ii_write_unlock(inode); |
16187 | + lockdep_on(); | |
16188 | + fput(h_file); | |
4f0767ce | 16189 | +out: |
b912730e | 16190 | + lockdep_off(); |
9dbd164d AM |
16191 | + si_read_unlock(sb); |
16192 | + lockdep_on(); | |
16193 | + AuTraceErr(err); | |
4a4d8108 AM |
16194 | + return err; |
16195 | +} | |
16196 | + | |
16197 | +/* ---------------------------------------------------------------------- */ | |
16198 | + | |
1e00d052 AM |
16199 | +static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end, |
16200 | + int datasync) | |
4a4d8108 AM |
16201 | +{ |
16202 | + int err; | |
b912730e | 16203 | + struct au_write_pre wpre; |
4a4d8108 AM |
16204 | + struct inode *inode; |
16205 | + struct file *h_file; | |
4a4d8108 AM |
16206 | + |
16207 | + err = 0; /* -EBADF; */ /* posix? */ | |
16208 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
b912730e | 16209 | + goto out; |
4a4d8108 | 16210 | + |
b912730e AM |
16211 | + inode = file_inode(file); |
16212 | + au_mtx_and_read_lock(inode); | |
16213 | + | |
521ced18 | 16214 | + wpre.lsc = 0; |
b912730e AM |
16215 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
16216 | + err = PTR_ERR(h_file); | |
16217 | + if (IS_ERR(h_file)) | |
4a4d8108 | 16218 | + goto out_unlock; |
4a4d8108 | 16219 | + |
53392da6 | 16220 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
b912730e | 16221 | + au_write_post(inode, h_file, &wpre, /*written*/0); |
4a4d8108 | 16222 | + |
4f0767ce | 16223 | +out_unlock: |
b912730e | 16224 | + si_read_unlock(inode->i_sb); |
febd17d6 | 16225 | + inode_unlock(inode); |
b912730e | 16226 | +out: |
4a4d8108 | 16227 | + return err; |
dece6358 AM |
16228 | +} |
16229 | + | |
4a4d8108 | 16230 | +static int aufs_fasync(int fd, struct file *file, int flag) |
dece6358 | 16231 | +{ |
4a4d8108 AM |
16232 | + int err; |
16233 | + struct file *h_file; | |
4a4d8108 | 16234 | + struct super_block *sb; |
1308ab2a | 16235 | + |
b912730e | 16236 | + sb = file->f_path.dentry->d_sb; |
e49829fe | 16237 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 16238 | + |
521ced18 | 16239 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
16240 | + err = PTR_ERR(h_file); |
16241 | + if (IS_ERR(h_file)) | |
4a4d8108 AM |
16242 | + goto out; |
16243 | + | |
523b37e3 | 16244 | + if (h_file->f_op->fasync) |
4a4d8108 | 16245 | + err = h_file->f_op->fasync(fd, h_file, flag); |
b912730e | 16246 | + fput(h_file); /* instead of au_read_post() */ |
1308ab2a | 16247 | + |
4f0767ce | 16248 | +out: |
4a4d8108 | 16249 | + si_read_unlock(sb); |
1308ab2a | 16250 | + return err; |
dece6358 | 16251 | +} |
4a4d8108 | 16252 | + |
febd17d6 JR |
16253 | +static int aufs_setfl(struct file *file, unsigned long arg) |
16254 | +{ | |
16255 | + int err; | |
16256 | + struct file *h_file; | |
16257 | + struct super_block *sb; | |
16258 | + | |
16259 | + sb = file->f_path.dentry->d_sb; | |
16260 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); | |
16261 | + | |
521ced18 | 16262 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
febd17d6 JR |
16263 | + err = PTR_ERR(h_file); |
16264 | + if (IS_ERR(h_file)) | |
16265 | + goto out; | |
16266 | + | |
1c60b727 AM |
16267 | + /* stop calling h_file->fasync */ |
16268 | + arg |= vfsub_file_flags(file) & FASYNC; | |
febd17d6 JR |
16269 | + err = setfl(/*unused fd*/-1, h_file, arg); |
16270 | + fput(h_file); /* instead of au_read_post() */ | |
16271 | + | |
16272 | +out: | |
16273 | + si_read_unlock(sb); | |
16274 | + return err; | |
16275 | +} | |
16276 | + | |
4a4d8108 AM |
16277 | +/* ---------------------------------------------------------------------- */ |
16278 | + | |
16279 | +/* no one supports this operation, currently */ | |
43982f53 | 16280 | +#if 0 /* reserved for future use */ |
4a4d8108 | 16281 | +static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset, |
2000de60 | 16282 | + size_t len, loff_t *pos, int more) |
4a4d8108 AM |
16283 | +{ |
16284 | +} | |
16285 | +#endif | |
16286 | + | |
16287 | +/* ---------------------------------------------------------------------- */ | |
16288 | + | |
16289 | +const struct file_operations aufs_file_fop = { | |
16290 | + .owner = THIS_MODULE, | |
2cbb1c4b | 16291 | + |
027c5e7a | 16292 | + .llseek = default_llseek, |
4a4d8108 AM |
16293 | + |
16294 | + .read = aufs_read, | |
16295 | + .write = aufs_write, | |
076b876e AM |
16296 | + .read_iter = aufs_read_iter, |
16297 | + .write_iter = aufs_write_iter, | |
16298 | + | |
4a4d8108 AM |
16299 | +#ifdef CONFIG_AUFS_POLL |
16300 | + .poll = aufs_poll, | |
16301 | +#endif | |
16302 | + .unlocked_ioctl = aufs_ioctl_nondir, | |
b752ccd1 | 16303 | +#ifdef CONFIG_COMPAT |
c2b27bf2 | 16304 | + .compat_ioctl = aufs_compat_ioctl_nondir, |
b752ccd1 | 16305 | +#endif |
4a4d8108 AM |
16306 | + .mmap = aufs_mmap, |
16307 | + .open = aufs_open_nondir, | |
16308 | + .flush = aufs_flush_nondir, | |
16309 | + .release = aufs_release_nondir, | |
16310 | + .fsync = aufs_fsync_nondir, | |
4a4d8108 AM |
16311 | + .fasync = aufs_fasync, |
16312 | + /* .sendpage = aufs_sendpage, */ | |
febd17d6 | 16313 | + .setfl = aufs_setfl, |
4a4d8108 AM |
16314 | + .splice_write = aufs_splice_write, |
16315 | + .splice_read = aufs_splice_read, | |
43982f53 | 16316 | +#if 0 /* reserved for future use */ |
4a4d8108 | 16317 | + .aio_splice_write = aufs_aio_splice_write, |
38d290e6 | 16318 | + .aio_splice_read = aufs_aio_splice_read, |
4a4d8108 | 16319 | +#endif |
521ced18 JR |
16320 | + .fallocate = aufs_fallocate, |
16321 | + .copy_file_range = aufs_copy_file_range | |
4a4d8108 | 16322 | +}; |
7f207e10 | 16323 | diff -urN /usr/share/empty/fs/aufs/fstype.h linux/fs/aufs/fstype.h |
eca34b5c | 16324 | --- /usr/share/empty/fs/aufs/fstype.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 16325 | +++ linux/fs/aufs/fstype.h 2020-01-27 10:57:18.172204883 +0100 |
062440b3 AM |
16326 | @@ -0,0 +1,401 @@ |
16327 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
4a4d8108 | 16328 | +/* |
016522bc | 16329 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
16330 | + * |
16331 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16332 | + * it under the terms of the GNU General Public License as published by | |
16333 | + * the Free Software Foundation; either version 2 of the License, or | |
16334 | + * (at your option) any later version. | |
16335 | + * | |
16336 | + * This program is distributed in the hope that it will be useful, | |
16337 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16338 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16339 | + * GNU General Public License for more details. | |
16340 | + * | |
16341 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 16342 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
16343 | + */ |
16344 | + | |
16345 | +/* | |
16346 | + * judging filesystem type | |
16347 | + */ | |
16348 | + | |
16349 | +#ifndef __AUFS_FSTYPE_H__ | |
16350 | +#define __AUFS_FSTYPE_H__ | |
16351 | + | |
16352 | +#ifdef __KERNEL__ | |
16353 | + | |
16354 | +#include <linux/fs.h> | |
16355 | +#include <linux/magic.h> | |
b912730e | 16356 | +#include <linux/nfs_fs.h> |
b95c5147 | 16357 | +#include <linux/romfs_fs.h> |
4a4d8108 AM |
16358 | + |
16359 | +static inline int au_test_aufs(struct super_block *sb) | |
16360 | +{ | |
16361 | + return sb->s_magic == AUFS_SUPER_MAGIC; | |
16362 | +} | |
16363 | + | |
16364 | +static inline const char *au_sbtype(struct super_block *sb) | |
16365 | +{ | |
16366 | + return sb->s_type->name; | |
16367 | +} | |
1308ab2a | 16368 | + |
16369 | +static inline int au_test_iso9660(struct super_block *sb __maybe_unused) | |
16370 | +{ | |
f0c0a007 | 16371 | +#if IS_ENABLED(CONFIG_ISO9660_FS) |
2000de60 | 16372 | + return sb->s_magic == ISOFS_SUPER_MAGIC; |
dece6358 AM |
16373 | +#else |
16374 | + return 0; | |
16375 | +#endif | |
16376 | +} | |
16377 | + | |
1308ab2a | 16378 | +static inline int au_test_romfs(struct super_block *sb __maybe_unused) |
dece6358 | 16379 | +{ |
f0c0a007 | 16380 | +#if IS_ENABLED(CONFIG_ROMFS_FS) |
2000de60 | 16381 | + return sb->s_magic == ROMFS_MAGIC; |
dece6358 AM |
16382 | +#else |
16383 | + return 0; | |
16384 | +#endif | |
16385 | +} | |
16386 | + | |
1308ab2a | 16387 | +static inline int au_test_cramfs(struct super_block *sb __maybe_unused) |
dece6358 | 16388 | +{ |
f0c0a007 | 16389 | +#if IS_ENABLED(CONFIG_CRAMFS) |
1308ab2a | 16390 | + return sb->s_magic == CRAMFS_MAGIC; |
16391 | +#endif | |
16392 | + return 0; | |
16393 | +} | |
16394 | + | |
16395 | +static inline int au_test_nfs(struct super_block *sb __maybe_unused) | |
16396 | +{ | |
f0c0a007 | 16397 | +#if IS_ENABLED(CONFIG_NFS_FS) |
1308ab2a | 16398 | + return sb->s_magic == NFS_SUPER_MAGIC; |
dece6358 AM |
16399 | +#else |
16400 | + return 0; | |
16401 | +#endif | |
16402 | +} | |
16403 | + | |
1308ab2a | 16404 | +static inline int au_test_fuse(struct super_block *sb __maybe_unused) |
dece6358 | 16405 | +{ |
f0c0a007 | 16406 | +#if IS_ENABLED(CONFIG_FUSE_FS) |
1308ab2a | 16407 | + return sb->s_magic == FUSE_SUPER_MAGIC; |
dece6358 AM |
16408 | +#else |
16409 | + return 0; | |
16410 | +#endif | |
16411 | +} | |
16412 | + | |
1308ab2a | 16413 | +static inline int au_test_xfs(struct super_block *sb __maybe_unused) |
dece6358 | 16414 | +{ |
f0c0a007 | 16415 | +#if IS_ENABLED(CONFIG_XFS_FS) |
1308ab2a | 16416 | + return sb->s_magic == XFS_SB_MAGIC; |
dece6358 AM |
16417 | +#else |
16418 | + return 0; | |
16419 | +#endif | |
16420 | +} | |
16421 | + | |
1308ab2a | 16422 | +static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) |
dece6358 | 16423 | +{ |
1308ab2a | 16424 | +#ifdef CONFIG_TMPFS |
16425 | + return sb->s_magic == TMPFS_MAGIC; | |
16426 | +#else | |
16427 | + return 0; | |
dece6358 | 16428 | +#endif |
dece6358 AM |
16429 | +} |
16430 | + | |
1308ab2a | 16431 | +static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) |
1facf9fc | 16432 | +{ |
f0c0a007 | 16433 | +#if IS_ENABLED(CONFIG_ECRYPT_FS) |
1308ab2a | 16434 | + return !strcmp(au_sbtype(sb), "ecryptfs"); |
16435 | +#else | |
16436 | + return 0; | |
16437 | +#endif | |
1facf9fc | 16438 | +} |
16439 | + | |
1308ab2a | 16440 | +static inline int au_test_ramfs(struct super_block *sb) |
16441 | +{ | |
16442 | + return sb->s_magic == RAMFS_MAGIC; | |
16443 | +} | |
16444 | + | |
16445 | +static inline int au_test_ubifs(struct super_block *sb __maybe_unused) | |
16446 | +{ | |
f0c0a007 | 16447 | +#if IS_ENABLED(CONFIG_UBIFS_FS) |
1308ab2a | 16448 | + return sb->s_magic == UBIFS_SUPER_MAGIC; |
16449 | +#else | |
16450 | + return 0; | |
16451 | +#endif | |
16452 | +} | |
16453 | + | |
16454 | +static inline int au_test_procfs(struct super_block *sb __maybe_unused) | |
16455 | +{ | |
16456 | +#ifdef CONFIG_PROC_FS | |
16457 | + return sb->s_magic == PROC_SUPER_MAGIC; | |
16458 | +#else | |
16459 | + return 0; | |
16460 | +#endif | |
16461 | +} | |
16462 | + | |
16463 | +static inline int au_test_sysfs(struct super_block *sb __maybe_unused) | |
16464 | +{ | |
16465 | +#ifdef CONFIG_SYSFS | |
16466 | + return sb->s_magic == SYSFS_MAGIC; | |
16467 | +#else | |
16468 | + return 0; | |
16469 | +#endif | |
16470 | +} | |
16471 | + | |
16472 | +static inline int au_test_configfs(struct super_block *sb __maybe_unused) | |
16473 | +{ | |
f0c0a007 | 16474 | +#if IS_ENABLED(CONFIG_CONFIGFS_FS) |
1308ab2a | 16475 | + return sb->s_magic == CONFIGFS_MAGIC; |
16476 | +#else | |
16477 | + return 0; | |
16478 | +#endif | |
16479 | +} | |
16480 | + | |
16481 | +static inline int au_test_minix(struct super_block *sb __maybe_unused) | |
16482 | +{ | |
f0c0a007 | 16483 | +#if IS_ENABLED(CONFIG_MINIX_FS) |
1308ab2a | 16484 | + return sb->s_magic == MINIX3_SUPER_MAGIC |
16485 | + || sb->s_magic == MINIX2_SUPER_MAGIC | |
16486 | + || sb->s_magic == MINIX2_SUPER_MAGIC2 | |
16487 | + || sb->s_magic == MINIX_SUPER_MAGIC | |
16488 | + || sb->s_magic == MINIX_SUPER_MAGIC2; | |
16489 | +#else | |
16490 | + return 0; | |
16491 | +#endif | |
16492 | +} | |
16493 | + | |
1308ab2a | 16494 | +static inline int au_test_fat(struct super_block *sb __maybe_unused) |
16495 | +{ | |
f0c0a007 | 16496 | +#if IS_ENABLED(CONFIG_FAT_FS) |
1308ab2a | 16497 | + return sb->s_magic == MSDOS_SUPER_MAGIC; |
16498 | +#else | |
16499 | + return 0; | |
16500 | +#endif | |
16501 | +} | |
16502 | + | |
16503 | +static inline int au_test_msdos(struct super_block *sb) | |
16504 | +{ | |
16505 | + return au_test_fat(sb); | |
16506 | +} | |
16507 | + | |
16508 | +static inline int au_test_vfat(struct super_block *sb) | |
16509 | +{ | |
16510 | + return au_test_fat(sb); | |
16511 | +} | |
16512 | + | |
16513 | +static inline int au_test_securityfs(struct super_block *sb __maybe_unused) | |
16514 | +{ | |
16515 | +#ifdef CONFIG_SECURITYFS | |
16516 | + return sb->s_magic == SECURITYFS_MAGIC; | |
16517 | +#else | |
16518 | + return 0; | |
16519 | +#endif | |
16520 | +} | |
16521 | + | |
16522 | +static inline int au_test_squashfs(struct super_block *sb __maybe_unused) | |
16523 | +{ | |
f0c0a007 | 16524 | +#if IS_ENABLED(CONFIG_SQUASHFS) |
1308ab2a | 16525 | + return sb->s_magic == SQUASHFS_MAGIC; |
16526 | +#else | |
16527 | + return 0; | |
16528 | +#endif | |
16529 | +} | |
16530 | + | |
16531 | +static inline int au_test_btrfs(struct super_block *sb __maybe_unused) | |
16532 | +{ | |
f0c0a007 | 16533 | +#if IS_ENABLED(CONFIG_BTRFS_FS) |
1308ab2a | 16534 | + return sb->s_magic == BTRFS_SUPER_MAGIC; |
16535 | +#else | |
16536 | + return 0; | |
16537 | +#endif | |
16538 | +} | |
16539 | + | |
16540 | +static inline int au_test_xenfs(struct super_block *sb __maybe_unused) | |
16541 | +{ | |
f0c0a007 | 16542 | +#if IS_ENABLED(CONFIG_XENFS) |
1308ab2a | 16543 | + return sb->s_magic == XENFS_SUPER_MAGIC; |
16544 | +#else | |
16545 | + return 0; | |
16546 | +#endif | |
16547 | +} | |
16548 | + | |
16549 | +static inline int au_test_debugfs(struct super_block *sb __maybe_unused) | |
16550 | +{ | |
16551 | +#ifdef CONFIG_DEBUG_FS | |
16552 | + return sb->s_magic == DEBUGFS_MAGIC; | |
16553 | +#else | |
16554 | + return 0; | |
16555 | +#endif | |
16556 | +} | |
16557 | + | |
16558 | +static inline int au_test_nilfs(struct super_block *sb __maybe_unused) | |
16559 | +{ | |
f0c0a007 | 16560 | +#if IS_ENABLED(CONFIG_NILFS) |
1308ab2a | 16561 | + return sb->s_magic == NILFS_SUPER_MAGIC; |
16562 | +#else | |
16563 | + return 0; | |
16564 | +#endif | |
16565 | +} | |
16566 | + | |
4a4d8108 AM |
16567 | +static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) |
16568 | +{ | |
f0c0a007 | 16569 | +#if IS_ENABLED(CONFIG_HFSPLUS_FS) |
4a4d8108 AM |
16570 | + return sb->s_magic == HFSPLUS_SUPER_MAGIC; |
16571 | +#else | |
16572 | + return 0; | |
16573 | +#endif | |
16574 | +} | |
16575 | + | |
1308ab2a | 16576 | +/* ---------------------------------------------------------------------- */ |
16577 | +/* | |
16578 | + * they can't be an aufs branch. | |
16579 | + */ | |
16580 | +static inline int au_test_fs_unsuppoted(struct super_block *sb) | |
16581 | +{ | |
16582 | + return | |
16583 | +#ifndef CONFIG_AUFS_BR_RAMFS | |
16584 | + au_test_ramfs(sb) || | |
16585 | +#endif | |
16586 | + au_test_procfs(sb) | |
16587 | + || au_test_sysfs(sb) | |
16588 | + || au_test_configfs(sb) | |
16589 | + || au_test_debugfs(sb) | |
16590 | + || au_test_securityfs(sb) | |
16591 | + || au_test_xenfs(sb) | |
16592 | + || au_test_ecryptfs(sb) | |
16593 | + /* || !strcmp(au_sbtype(sb), "unionfs") */ | |
16594 | + || au_test_aufs(sb); /* will be supported in next version */ | |
16595 | +} | |
16596 | + | |
1308ab2a | 16597 | +static inline int au_test_fs_remote(struct super_block *sb) |
16598 | +{ | |
16599 | + return !au_test_tmpfs(sb) | |
16600 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
16601 | + && !au_test_ramfs(sb) | |
16602 | +#endif | |
16603 | + && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); | |
16604 | +} | |
16605 | + | |
16606 | +/* ---------------------------------------------------------------------- */ | |
16607 | + | |
16608 | +/* | |
16609 | + * Note: these functions (below) are created after reading ->getattr() in all | |
16610 | + * filesystems under linux/fs. it means we have to do so in every update... | |
16611 | + */ | |
16612 | + | |
16613 | +/* | |
16614 | + * some filesystems require getattr to refresh the inode attributes before | |
16615 | + * referencing. | |
16616 | + * in most cases, we can rely on the inode attribute in NFS (or every remote fs) | |
16617 | + * and leave the work for d_revalidate() | |
16618 | + */ | |
16619 | +static inline int au_test_fs_refresh_iattr(struct super_block *sb) | |
16620 | +{ | |
16621 | + return au_test_nfs(sb) | |
16622 | + || au_test_fuse(sb) | |
1308ab2a | 16623 | + /* || au_test_btrfs(sb) */ /* untested */ |
1308ab2a | 16624 | + ; |
16625 | +} | |
16626 | + | |
16627 | +/* | |
16628 | + * filesystems which don't maintain i_size or i_blocks. | |
16629 | + */ | |
16630 | +static inline int au_test_fs_bad_iattr_size(struct super_block *sb) | |
16631 | +{ | |
16632 | + return au_test_xfs(sb) | |
4a4d8108 AM |
16633 | + || au_test_btrfs(sb) |
16634 | + || au_test_ubifs(sb) | |
16635 | + || au_test_hfsplus(sb) /* maintained, but incorrect */ | |
1308ab2a | 16636 | + /* || au_test_minix(sb) */ /* untested */ |
16637 | + ; | |
16638 | +} | |
16639 | + | |
16640 | +/* | |
16641 | + * filesystems which don't store the correct value in some of their inode | |
16642 | + * attributes. | |
16643 | + */ | |
16644 | +static inline int au_test_fs_bad_iattr(struct super_block *sb) | |
16645 | +{ | |
16646 | + return au_test_fs_bad_iattr_size(sb) | |
1308ab2a | 16647 | + || au_test_fat(sb) |
16648 | + || au_test_msdos(sb) | |
16649 | + || au_test_vfat(sb); | |
1facf9fc | 16650 | +} |
16651 | + | |
16652 | +/* they don't check i_nlink in link(2) */ | |
16653 | +static inline int au_test_fs_no_limit_nlink(struct super_block *sb) | |
16654 | +{ | |
16655 | + return au_test_tmpfs(sb) | |
16656 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
16657 | + || au_test_ramfs(sb) | |
16658 | +#endif | |
4a4d8108 | 16659 | + || au_test_ubifs(sb) |
4a4d8108 | 16660 | + || au_test_hfsplus(sb); |
1facf9fc | 16661 | +} |
16662 | + | |
16663 | +/* | |
16664 | + * filesystems which sets S_NOATIME and S_NOCMTIME. | |
16665 | + */ | |
16666 | +static inline int au_test_fs_notime(struct super_block *sb) | |
16667 | +{ | |
16668 | + return au_test_nfs(sb) | |
16669 | + || au_test_fuse(sb) | |
dece6358 | 16670 | + || au_test_ubifs(sb) |
1facf9fc | 16671 | + ; |
16672 | +} | |
16673 | + | |
1facf9fc | 16674 | +/* temporary support for i#1 in cramfs */ |
16675 | +static inline int au_test_fs_unique_ino(struct inode *inode) | |
16676 | +{ | |
16677 | + if (au_test_cramfs(inode->i_sb)) | |
16678 | + return inode->i_ino != 1; | |
16679 | + return 1; | |
16680 | +} | |
16681 | + | |
16682 | +/* ---------------------------------------------------------------------- */ | |
16683 | + | |
16684 | +/* | |
16685 | + * the filesystem where the xino files placed must support i/o after unlink and | |
16686 | + * maintain i_size and i_blocks. | |
16687 | + */ | |
16688 | +static inline int au_test_fs_bad_xino(struct super_block *sb) | |
16689 | +{ | |
16690 | + return au_test_fs_remote(sb) | |
16691 | + || au_test_fs_bad_iattr_size(sb) | |
1facf9fc | 16692 | + /* don't want unnecessary work for xino */ |
16693 | + || au_test_aufs(sb) | |
1308ab2a | 16694 | + || au_test_ecryptfs(sb) |
16695 | + || au_test_nilfs(sb); | |
1facf9fc | 16696 | +} |
16697 | + | |
16698 | +static inline int au_test_fs_trunc_xino(struct super_block *sb) | |
16699 | +{ | |
16700 | + return au_test_tmpfs(sb) | |
16701 | + || au_test_ramfs(sb); | |
16702 | +} | |
16703 | + | |
16704 | +/* | |
16705 | + * test if the @sb is real-readonly. | |
16706 | + */ | |
16707 | +static inline int au_test_fs_rr(struct super_block *sb) | |
16708 | +{ | |
16709 | + return au_test_squashfs(sb) | |
16710 | + || au_test_iso9660(sb) | |
16711 | + || au_test_cramfs(sb) | |
16712 | + || au_test_romfs(sb); | |
16713 | +} | |
16714 | + | |
b912730e AM |
16715 | +/* |
16716 | + * test if the @inode is nfs with 'noacl' option | |
2121bcd9 | 16717 | + * NFS always sets SB_POSIXACL regardless its mount option 'noacl.' |
b912730e AM |
16718 | + */ |
16719 | +static inline int au_test_nfs_noacl(struct inode *inode) | |
16720 | +{ | |
16721 | + return au_test_nfs(inode->i_sb) | |
16722 | + /* && IS_POSIXACL(inode) */ | |
16723 | + && !nfs_server_capable(inode, NFS_CAP_ACLS); | |
16724 | +} | |
16725 | + | |
1facf9fc | 16726 | +#endif /* __KERNEL__ */ |
16727 | +#endif /* __AUFS_FSTYPE_H__ */ | |
8b6a4947 | 16728 | diff -urN /usr/share/empty/fs/aufs/hbl.h linux/fs/aufs/hbl.h |
eca34b5c | 16729 | --- /usr/share/empty/fs/aufs/hbl.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 16730 | +++ linux/fs/aufs/hbl.h 2020-01-27 10:57:18.172204883 +0100 |
062440b3 AM |
16731 | @@ -0,0 +1,65 @@ |
16732 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
8b6a4947 | 16733 | +/* |
016522bc | 16734 | + * Copyright (C) 2017-2020 Junjiro R. Okajima |
8b6a4947 AM |
16735 | + * |
16736 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16737 | + * it under the terms of the GNU General Public License as published by | |
16738 | + * the Free Software Foundation; either version 2 of the License, or | |
16739 | + * (at your option) any later version. | |
16740 | + * | |
16741 | + * This program is distributed in the hope that it will be useful, | |
16742 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16743 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16744 | + * GNU General Public License for more details. | |
16745 | + * | |
16746 | + * You should have received a copy of the GNU General Public License | |
16747 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16748 | + */ | |
16749 | + | |
16750 | +/* | |
16751 | + * helpers for hlist_bl.h | |
16752 | + */ | |
16753 | + | |
16754 | +#ifndef __AUFS_HBL_H__ | |
16755 | +#define __AUFS_HBL_H__ | |
16756 | + | |
16757 | +#ifdef __KERNEL__ | |
16758 | + | |
16759 | +#include <linux/list_bl.h> | |
16760 | + | |
16761 | +static inline void au_hbl_add(struct hlist_bl_node *node, | |
16762 | + struct hlist_bl_head *hbl) | |
16763 | +{ | |
16764 | + hlist_bl_lock(hbl); | |
16765 | + hlist_bl_add_head(node, hbl); | |
16766 | + hlist_bl_unlock(hbl); | |
16767 | +} | |
16768 | + | |
16769 | +static inline void au_hbl_del(struct hlist_bl_node *node, | |
16770 | + struct hlist_bl_head *hbl) | |
16771 | +{ | |
16772 | + hlist_bl_lock(hbl); | |
16773 | + hlist_bl_del(node); | |
16774 | + hlist_bl_unlock(hbl); | |
16775 | +} | |
16776 | + | |
16777 | +#define au_hbl_for_each(pos, head) \ | |
16778 | + for (pos = hlist_bl_first(head); \ | |
16779 | + pos; \ | |
16780 | + pos = pos->next) | |
16781 | + | |
16782 | +static inline unsigned long au_hbl_count(struct hlist_bl_head *hbl) | |
16783 | +{ | |
16784 | + unsigned long cnt; | |
16785 | + struct hlist_bl_node *pos; | |
16786 | + | |
16787 | + cnt = 0; | |
16788 | + hlist_bl_lock(hbl); | |
16789 | + au_hbl_for_each(pos, hbl) | |
16790 | + cnt++; | |
16791 | + hlist_bl_unlock(hbl); | |
16792 | + return cnt; | |
16793 | +} | |
16794 | + | |
16795 | +#endif /* __KERNEL__ */ | |
16796 | +#endif /* __AUFS_HBL_H__ */ | |
7f207e10 | 16797 | diff -urN /usr/share/empty/fs/aufs/hfsnotify.c linux/fs/aufs/hfsnotify.c |
eca34b5c | 16798 | --- /usr/share/empty/fs/aufs/hfsnotify.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 16799 | +++ linux/fs/aufs/hfsnotify.c 2020-01-27 10:57:18.172204883 +0100 |
fbc438ed | 16800 | @@ -0,0 +1,288 @@ |
cd7a4cd9 | 16801 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 16802 | +/* |
016522bc | 16803 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 16804 | + * |
16805 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16806 | + * it under the terms of the GNU General Public License as published by | |
16807 | + * the Free Software Foundation; either version 2 of the License, or | |
16808 | + * (at your option) any later version. | |
dece6358 AM |
16809 | + * |
16810 | + * This program is distributed in the hope that it will be useful, | |
16811 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16812 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16813 | + * GNU General Public License for more details. | |
16814 | + * | |
16815 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 16816 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 16817 | + */ |
16818 | + | |
16819 | +/* | |
4a4d8108 | 16820 | + * fsnotify for the lower directories |
1facf9fc | 16821 | + */ |
16822 | + | |
16823 | +#include "aufs.h" | |
16824 | + | |
4a4d8108 AM |
16825 | +/* FS_IN_IGNORED is unnecessary */ |
16826 | +static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE | |
16827 | + | FS_CREATE | FS_EVENT_ON_CHILD); | |
7f207e10 | 16828 | +static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq); |
7eafdf33 | 16829 | +static __cacheline_aligned_in_smp atomic64_t au_hfsn_ifree = ATOMIC64_INIT(0); |
1facf9fc | 16830 | + |
0c5527e5 | 16831 | +static void au_hfsn_free_mark(struct fsnotify_mark *mark) |
1facf9fc | 16832 | +{ |
0c5527e5 AM |
16833 | + struct au_hnotify *hn = container_of(mark, struct au_hnotify, |
16834 | + hn_mark); | |
5afbbe0d | 16835 | + /* AuDbg("here\n"); */ |
1c60b727 | 16836 | + au_cache_free_hnotify(hn); |
8b6a4947 | 16837 | + smp_mb__before_atomic(); /* for atomic64_dec */ |
1716fcea AM |
16838 | + if (atomic64_dec_and_test(&au_hfsn_ifree)) |
16839 | + wake_up(&au_hfsn_wq); | |
4a4d8108 | 16840 | +} |
1facf9fc | 16841 | + |
027c5e7a | 16842 | +static int au_hfsn_alloc(struct au_hinode *hinode) |
4a4d8108 | 16843 | +{ |
1716fcea | 16844 | + int err; |
027c5e7a AM |
16845 | + struct au_hnotify *hn; |
16846 | + struct super_block *sb; | |
16847 | + struct au_branch *br; | |
0c5527e5 | 16848 | + struct fsnotify_mark *mark; |
027c5e7a | 16849 | + aufs_bindex_t bindex; |
1facf9fc | 16850 | + |
027c5e7a AM |
16851 | + hn = hinode->hi_notify; |
16852 | + sb = hn->hn_aufs_inode->i_sb; | |
16853 | + bindex = au_br_index(sb, hinode->hi_id); | |
16854 | + br = au_sbr(sb, bindex); | |
1716fcea AM |
16855 | + AuDebugOn(!br->br_hfsn); |
16856 | + | |
0c5527e5 | 16857 | + mark = &hn->hn_mark; |
ffa93bbd | 16858 | + fsnotify_init_mark(mark, br->br_hfsn->hfsn_group); |
0c5527e5 | 16859 | + mark->mask = AuHfsnMask; |
7f207e10 AM |
16860 | + /* |
16861 | + * by udba rename or rmdir, aufs assign a new inode to the known | |
16862 | + * h_inode, so specify 1 to allow dups. | |
16863 | + */ | |
c1595e42 | 16864 | + lockdep_off(); |
acd2b654 | 16865 | + err = fsnotify_add_inode_mark(mark, hinode->hi_inode, /*allow_dups*/1); |
c1595e42 | 16866 | + lockdep_on(); |
1716fcea AM |
16867 | + |
16868 | + return err; | |
1facf9fc | 16869 | +} |
16870 | + | |
7eafdf33 | 16871 | +static int au_hfsn_free(struct au_hinode *hinode, struct au_hnotify *hn) |
1facf9fc | 16872 | +{ |
0c5527e5 | 16873 | + struct fsnotify_mark *mark; |
7eafdf33 | 16874 | + unsigned long long ull; |
1716fcea | 16875 | + struct fsnotify_group *group; |
7eafdf33 AM |
16876 | + |
16877 | + ull = atomic64_inc_return(&au_hfsn_ifree); | |
16878 | + BUG_ON(!ull); | |
953406b4 | 16879 | + |
0c5527e5 | 16880 | + mark = &hn->hn_mark; |
1716fcea AM |
16881 | + spin_lock(&mark->lock); |
16882 | + group = mark->group; | |
16883 | + fsnotify_get_group(group); | |
16884 | + spin_unlock(&mark->lock); | |
c1595e42 | 16885 | + lockdep_off(); |
1716fcea | 16886 | + fsnotify_destroy_mark(mark, group); |
5afbbe0d | 16887 | + fsnotify_put_mark(mark); |
1716fcea | 16888 | + fsnotify_put_group(group); |
c1595e42 | 16889 | + lockdep_on(); |
7f207e10 | 16890 | + |
7eafdf33 AM |
16891 | + /* free hn by myself */ |
16892 | + return 0; | |
1facf9fc | 16893 | +} |
16894 | + | |
16895 | +/* ---------------------------------------------------------------------- */ | |
16896 | + | |
4a4d8108 | 16897 | +static void au_hfsn_ctl(struct au_hinode *hinode, int do_set) |
1facf9fc | 16898 | +{ |
0c5527e5 | 16899 | + struct fsnotify_mark *mark; |
1facf9fc | 16900 | + |
0c5527e5 AM |
16901 | + mark = &hinode->hi_notify->hn_mark; |
16902 | + spin_lock(&mark->lock); | |
1facf9fc | 16903 | + if (do_set) { |
0c5527e5 AM |
16904 | + AuDebugOn(mark->mask & AuHfsnMask); |
16905 | + mark->mask |= AuHfsnMask; | |
1facf9fc | 16906 | + } else { |
0c5527e5 AM |
16907 | + AuDebugOn(!(mark->mask & AuHfsnMask)); |
16908 | + mark->mask &= ~AuHfsnMask; | |
1facf9fc | 16909 | + } |
0c5527e5 | 16910 | + spin_unlock(&mark->lock); |
4a4d8108 | 16911 | + /* fsnotify_recalc_inode_mask(hinode->hi_inode); */ |
1facf9fc | 16912 | +} |
16913 | + | |
4a4d8108 | 16914 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 16915 | + |
4a4d8108 AM |
16916 | +/* #define AuDbgHnotify */ |
16917 | +#ifdef AuDbgHnotify | |
16918 | +static char *au_hfsn_name(u32 mask) | |
16919 | +{ | |
16920 | +#ifdef CONFIG_AUFS_DEBUG | |
c06a8ce3 AM |
16921 | +#define test_ret(flag) \ |
16922 | + do { \ | |
16923 | + if (mask & flag) \ | |
16924 | + return #flag; \ | |
16925 | + } while (0) | |
4a4d8108 AM |
16926 | + test_ret(FS_ACCESS); |
16927 | + test_ret(FS_MODIFY); | |
16928 | + test_ret(FS_ATTRIB); | |
16929 | + test_ret(FS_CLOSE_WRITE); | |
16930 | + test_ret(FS_CLOSE_NOWRITE); | |
16931 | + test_ret(FS_OPEN); | |
16932 | + test_ret(FS_MOVED_FROM); | |
16933 | + test_ret(FS_MOVED_TO); | |
16934 | + test_ret(FS_CREATE); | |
16935 | + test_ret(FS_DELETE); | |
16936 | + test_ret(FS_DELETE_SELF); | |
16937 | + test_ret(FS_MOVE_SELF); | |
16938 | + test_ret(FS_UNMOUNT); | |
16939 | + test_ret(FS_Q_OVERFLOW); | |
16940 | + test_ret(FS_IN_IGNORED); | |
b912730e | 16941 | + test_ret(FS_ISDIR); |
4a4d8108 AM |
16942 | + test_ret(FS_IN_ONESHOT); |
16943 | + test_ret(FS_EVENT_ON_CHILD); | |
16944 | + return ""; | |
16945 | +#undef test_ret | |
16946 | +#else | |
16947 | + return "??"; | |
16948 | +#endif | |
1facf9fc | 16949 | +} |
4a4d8108 | 16950 | +#endif |
1facf9fc | 16951 | + |
16952 | +/* ---------------------------------------------------------------------- */ | |
16953 | + | |
1716fcea AM |
16954 | +static void au_hfsn_free_group(struct fsnotify_group *group) |
16955 | +{ | |
16956 | + struct au_br_hfsnotify *hfsn = group->private; | |
16957 | + | |
5afbbe0d | 16958 | + /* AuDbg("here\n"); */ |
9f237c51 | 16959 | + au_kfree_try_rcu(hfsn); |
1716fcea AM |
16960 | +} |
16961 | + | |
4a4d8108 | 16962 | +static int au_hfsn_handle_event(struct fsnotify_group *group, |
fb47a38f | 16963 | + struct inode *inode, |
a2654f78 | 16964 | + u32 mask, const void *data, int data_type, |
83b672a5 | 16965 | + const struct qstr *file_name, u32 cookie, |
ffa93bbd | 16966 | + struct fsnotify_iter_info *iter_info) |
1facf9fc | 16967 | +{ |
16968 | + int err; | |
4a4d8108 AM |
16969 | + struct au_hnotify *hnotify; |
16970 | + struct inode *h_dir, *h_inode; | |
cd7a4cd9 | 16971 | + struct fsnotify_mark *inode_mark; |
4a4d8108 | 16972 | + |
fb47a38f | 16973 | + AuDebugOn(data_type != FSNOTIFY_EVENT_INODE); |
1facf9fc | 16974 | + |
16975 | + err = 0; | |
0c5527e5 | 16976 | + /* if FS_UNMOUNT happens, there must be another bug */ |
4a4d8108 | 16977 | + AuDebugOn(mask & FS_UNMOUNT); |
0c5527e5 | 16978 | + if (mask & (FS_IN_IGNORED | FS_UNMOUNT)) |
1facf9fc | 16979 | + goto out; |
1facf9fc | 16980 | + |
fb47a38f JR |
16981 | + h_dir = inode; |
16982 | + h_inode = NULL; | |
4a4d8108 | 16983 | +#ifdef AuDbgHnotify |
392086de | 16984 | + au_debug_on(); |
fbc438ed JR |
16985 | + if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1 |
16986 | + || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) { | |
4a4d8108 AM |
16987 | + AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n", |
16988 | + h_dir->i_ino, mask, au_hfsn_name(mask), | |
fbc438ed | 16989 | + AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0); |
4a4d8108 | 16990 | + /* WARN_ON(1); */ |
1facf9fc | 16991 | + } |
392086de | 16992 | + au_debug_off(); |
1facf9fc | 16993 | +#endif |
4a4d8108 | 16994 | + |
cd7a4cd9 | 16995 | + inode_mark = fsnotify_iter_inode_mark(iter_info); |
0c5527e5 AM |
16996 | + AuDebugOn(!inode_mark); |
16997 | + hnotify = container_of(inode_mark, struct au_hnotify, hn_mark); | |
b62f1e65 | 16998 | + err = au_hnotify(h_dir, hnotify, mask, file_name, h_inode); |
1facf9fc | 16999 | + |
4a4d8108 AM |
17000 | +out: |
17001 | + return err; | |
17002 | +} | |
1facf9fc | 17003 | + |
4a4d8108 | 17004 | +static struct fsnotify_ops au_hfsn_ops = { |
1716fcea | 17005 | + .handle_event = au_hfsn_handle_event, |
ffa93bbd AM |
17006 | + .free_group_priv = au_hfsn_free_group, |
17007 | + .free_mark = au_hfsn_free_mark | |
4a4d8108 AM |
17008 | +}; |
17009 | + | |
17010 | +/* ---------------------------------------------------------------------- */ | |
17011 | + | |
027c5e7a AM |
17012 | +static void au_hfsn_fin_br(struct au_branch *br) |
17013 | +{ | |
1716fcea | 17014 | + struct au_br_hfsnotify *hfsn; |
027c5e7a | 17015 | + |
1716fcea | 17016 | + hfsn = br->br_hfsn; |
c1595e42 JR |
17017 | + if (hfsn) { |
17018 | + lockdep_off(); | |
1716fcea | 17019 | + fsnotify_put_group(hfsn->hfsn_group); |
c1595e42 JR |
17020 | + lockdep_on(); |
17021 | + } | |
027c5e7a AM |
17022 | +} |
17023 | + | |
1716fcea | 17024 | +static int au_hfsn_init_br(struct au_branch *br, int perm) |
4a4d8108 AM |
17025 | +{ |
17026 | + int err; | |
1716fcea AM |
17027 | + struct fsnotify_group *group; |
17028 | + struct au_br_hfsnotify *hfsn; | |
1facf9fc | 17029 | + |
4a4d8108 | 17030 | + err = 0; |
1716fcea AM |
17031 | + br->br_hfsn = NULL; |
17032 | + if (!au_br_hnotifyable(perm)) | |
027c5e7a | 17033 | + goto out; |
027c5e7a | 17034 | + |
1716fcea AM |
17035 | + err = -ENOMEM; |
17036 | + hfsn = kmalloc(sizeof(*hfsn), GFP_NOFS); | |
17037 | + if (unlikely(!hfsn)) | |
027c5e7a AM |
17038 | + goto out; |
17039 | + | |
1716fcea AM |
17040 | + err = 0; |
17041 | + group = fsnotify_alloc_group(&au_hfsn_ops); | |
17042 | + if (IS_ERR(group)) { | |
17043 | + err = PTR_ERR(group); | |
0c5527e5 | 17044 | + pr_err("fsnotify_alloc_group() failed, %d\n", err); |
1716fcea | 17045 | + goto out_hfsn; |
4a4d8108 | 17046 | + } |
1facf9fc | 17047 | + |
1716fcea AM |
17048 | + group->private = hfsn; |
17049 | + hfsn->hfsn_group = group; | |
17050 | + br->br_hfsn = hfsn; | |
17051 | + goto out; /* success */ | |
17052 | + | |
17053 | +out_hfsn: | |
9f237c51 | 17054 | + au_kfree_try_rcu(hfsn); |
027c5e7a | 17055 | +out: |
1716fcea AM |
17056 | + return err; |
17057 | +} | |
17058 | + | |
17059 | +static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
17060 | +{ | |
17061 | + int err; | |
17062 | + | |
17063 | + err = 0; | |
17064 | + if (!br->br_hfsn) | |
17065 | + err = au_hfsn_init_br(br, perm); | |
17066 | + | |
1facf9fc | 17067 | + return err; |
17068 | +} | |
17069 | + | |
7eafdf33 AM |
17070 | +/* ---------------------------------------------------------------------- */ |
17071 | + | |
17072 | +static void au_hfsn_fin(void) | |
17073 | +{ | |
17074 | + AuDbg("au_hfsn_ifree %lld\n", (long long)atomic64_read(&au_hfsn_ifree)); | |
17075 | + wait_event(au_hfsn_wq, !atomic64_read(&au_hfsn_ifree)); | |
17076 | +} | |
17077 | + | |
4a4d8108 AM |
17078 | +const struct au_hnotify_op au_hnotify_op = { |
17079 | + .ctl = au_hfsn_ctl, | |
17080 | + .alloc = au_hfsn_alloc, | |
17081 | + .free = au_hfsn_free, | |
1facf9fc | 17082 | + |
7eafdf33 AM |
17083 | + .fin = au_hfsn_fin, |
17084 | + | |
027c5e7a AM |
17085 | + .reset_br = au_hfsn_reset_br, |
17086 | + .fin_br = au_hfsn_fin_br, | |
17087 | + .init_br = au_hfsn_init_br | |
4a4d8108 | 17088 | +}; |
7f207e10 | 17089 | diff -urN /usr/share/empty/fs/aufs/hfsplus.c linux/fs/aufs/hfsplus.c |
eca34b5c | 17090 | --- /usr/share/empty/fs/aufs/hfsplus.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 17091 | +++ linux/fs/aufs/hfsplus.c 2020-01-27 10:57:18.172204883 +0100 |
acd2b654 | 17092 | @@ -0,0 +1,60 @@ |
cd7a4cd9 | 17093 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 17094 | +/* |
016522bc | 17095 | + * Copyright (C) 2010-2020 Junjiro R. Okajima |
4a4d8108 AM |
17096 | + * |
17097 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17098 | + * it under the terms of the GNU General Public License as published by | |
17099 | + * the Free Software Foundation; either version 2 of the License, or | |
17100 | + * (at your option) any later version. | |
17101 | + * | |
17102 | + * This program is distributed in the hope that it will be useful, | |
17103 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17104 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17105 | + * GNU General Public License for more details. | |
17106 | + * | |
17107 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17108 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 17109 | + */ |
1facf9fc | 17110 | + |
4a4d8108 | 17111 | +/* |
acd2b654 | 17112 | + * special support for filesystems which acquires an inode mutex |
4a4d8108 AM |
17113 | + * at final closing a file, eg, hfsplus. |
17114 | + * | |
17115 | + * This trick is very simple and stupid, just to open the file before really | |
acd2b654 | 17116 | + * necessary open to tell hfsplus that this is not the final closing. |
4a4d8108 AM |
17117 | + * The caller should call au_h_open_pre() after acquiring the inode mutex, |
17118 | + * and au_h_open_post() after releasing it. | |
17119 | + */ | |
1facf9fc | 17120 | + |
4a4d8108 | 17121 | +#include "aufs.h" |
1facf9fc | 17122 | + |
392086de AM |
17123 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, |
17124 | + int force_wr) | |
4a4d8108 AM |
17125 | +{ |
17126 | + struct file *h_file; | |
17127 | + struct dentry *h_dentry; | |
1facf9fc | 17128 | + |
4a4d8108 AM |
17129 | + h_dentry = au_h_dptr(dentry, bindex); |
17130 | + AuDebugOn(!h_dentry); | |
5527c038 | 17131 | + AuDebugOn(d_is_negative(h_dentry)); |
4a4d8108 AM |
17132 | + |
17133 | + h_file = NULL; | |
17134 | + if (au_test_hfsplus(h_dentry->d_sb) | |
7e9cd9fe | 17135 | + && d_is_reg(h_dentry)) |
4a4d8108 AM |
17136 | + h_file = au_h_open(dentry, bindex, |
17137 | + O_RDONLY | O_NOATIME | O_LARGEFILE, | |
392086de | 17138 | + /*file*/NULL, force_wr); |
4a4d8108 | 17139 | + return h_file; |
1facf9fc | 17140 | +} |
17141 | + | |
4a4d8108 AM |
17142 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
17143 | + struct file *h_file) | |
17144 | +{ | |
acd2b654 AM |
17145 | + struct au_branch *br; |
17146 | + | |
4a4d8108 AM |
17147 | + if (h_file) { |
17148 | + fput(h_file); | |
acd2b654 AM |
17149 | + br = au_sbr(dentry->d_sb, bindex); |
17150 | + au_lcnt_dec(&br->br_nfiles); | |
4a4d8108 AM |
17151 | + } |
17152 | +} | |
7f207e10 | 17153 | diff -urN /usr/share/empty/fs/aufs/hnotify.c linux/fs/aufs/hnotify.c |
eca34b5c | 17154 | --- /usr/share/empty/fs/aufs/hnotify.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 17155 | +++ linux/fs/aufs/hnotify.c 2020-01-27 10:57:18.172204883 +0100 |
43982f53 | 17156 | @@ -0,0 +1,715 @@ |
cd7a4cd9 | 17157 | +// SPDX-License-Identifier: GPL-2.0 |
e49829fe | 17158 | +/* |
016522bc | 17159 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
e49829fe JR |
17160 | + * |
17161 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17162 | + * it under the terms of the GNU General Public License as published by | |
17163 | + * the Free Software Foundation; either version 2 of the License, or | |
17164 | + * (at your option) any later version. | |
17165 | + * | |
17166 | + * This program is distributed in the hope that it will be useful, | |
17167 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17168 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17169 | + * GNU General Public License for more details. | |
17170 | + * | |
17171 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17172 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
e49829fe JR |
17173 | + */ |
17174 | + | |
17175 | +/* | |
7f207e10 | 17176 | + * abstraction to notify the direct changes on lower directories |
e49829fe JR |
17177 | + */ |
17178 | + | |
eca801bf | 17179 | +/* #include <linux/iversion.h> */ |
e49829fe JR |
17180 | +#include "aufs.h" |
17181 | + | |
027c5e7a | 17182 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode) |
e49829fe JR |
17183 | +{ |
17184 | + int err; | |
7f207e10 | 17185 | + struct au_hnotify *hn; |
1facf9fc | 17186 | + |
4a4d8108 AM |
17187 | + err = -ENOMEM; |
17188 | + hn = au_cache_alloc_hnotify(); | |
17189 | + if (hn) { | |
17190 | + hn->hn_aufs_inode = inode; | |
027c5e7a AM |
17191 | + hinode->hi_notify = hn; |
17192 | + err = au_hnotify_op.alloc(hinode); | |
17193 | + AuTraceErr(err); | |
17194 | + if (unlikely(err)) { | |
17195 | + hinode->hi_notify = NULL; | |
1c60b727 | 17196 | + au_cache_free_hnotify(hn); |
4a4d8108 AM |
17197 | + /* |
17198 | + * The upper dir was removed by udba, but the same named | |
acd2b654 | 17199 | + * dir left. In this case, aufs assigns a new inode |
4a4d8108 | 17200 | + * number and set the monitor again. |
acd2b654 | 17201 | + * For the lower dir, the old monitor is still left. |
4a4d8108 AM |
17202 | + */ |
17203 | + if (err == -EEXIST) | |
17204 | + err = 0; | |
17205 | + } | |
1308ab2a | 17206 | + } |
1308ab2a | 17207 | + |
027c5e7a | 17208 | + AuTraceErr(err); |
1308ab2a | 17209 | + return err; |
dece6358 | 17210 | +} |
1facf9fc | 17211 | + |
4a4d8108 | 17212 | +void au_hn_free(struct au_hinode *hinode) |
dece6358 | 17213 | +{ |
4a4d8108 | 17214 | + struct au_hnotify *hn; |
1facf9fc | 17215 | + |
4a4d8108 AM |
17216 | + hn = hinode->hi_notify; |
17217 | + if (hn) { | |
4a4d8108 | 17218 | + hinode->hi_notify = NULL; |
7eafdf33 | 17219 | + if (au_hnotify_op.free(hinode, hn)) |
1c60b727 | 17220 | + au_cache_free_hnotify(hn); |
4a4d8108 AM |
17221 | + } |
17222 | +} | |
dece6358 | 17223 | + |
4a4d8108 | 17224 | +/* ---------------------------------------------------------------------- */ |
dece6358 | 17225 | + |
4a4d8108 AM |
17226 | +void au_hn_ctl(struct au_hinode *hinode, int do_set) |
17227 | +{ | |
17228 | + if (hinode->hi_notify) | |
17229 | + au_hnotify_op.ctl(hinode, do_set); | |
17230 | +} | |
17231 | + | |
17232 | +void au_hn_reset(struct inode *inode, unsigned int flags) | |
17233 | +{ | |
5afbbe0d | 17234 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
17235 | + struct inode *hi; |
17236 | + struct dentry *iwhdentry; | |
1facf9fc | 17237 | + |
5afbbe0d AM |
17238 | + bbot = au_ibbot(inode); |
17239 | + for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { | |
4a4d8108 AM |
17240 | + hi = au_h_iptr(inode, bindex); |
17241 | + if (!hi) | |
17242 | + continue; | |
1308ab2a | 17243 | + |
febd17d6 | 17244 | + /* inode_lock_nested(hi, AuLsc_I_CHILD); */ |
4a4d8108 AM |
17245 | + iwhdentry = au_hi_wh(inode, bindex); |
17246 | + if (iwhdentry) | |
17247 | + dget(iwhdentry); | |
17248 | + au_igrab(hi); | |
17249 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
17250 | + au_set_h_iptr(inode, bindex, au_igrab(hi), | |
17251 | + flags & ~AuHi_XINO); | |
17252 | + iput(hi); | |
17253 | + dput(iwhdentry); | |
febd17d6 | 17254 | + /* inode_unlock(hi); */ |
1facf9fc | 17255 | + } |
1facf9fc | 17256 | +} |
17257 | + | |
1308ab2a | 17258 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17259 | + |
4a4d8108 | 17260 | +static int hn_xino(struct inode *inode, struct inode *h_inode) |
1facf9fc | 17261 | +{ |
4a4d8108 | 17262 | + int err; |
5afbbe0d | 17263 | + aufs_bindex_t bindex, bbot, bfound, btop; |
4a4d8108 | 17264 | + struct inode *h_i; |
1facf9fc | 17265 | + |
4a4d8108 AM |
17266 | + err = 0; |
17267 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17268 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17269 | + goto out; |
17270 | + } | |
1facf9fc | 17271 | + |
4a4d8108 | 17272 | + bfound = -1; |
5afbbe0d AM |
17273 | + bbot = au_ibbot(inode); |
17274 | + btop = au_ibtop(inode); | |
4a4d8108 | 17275 | +#if 0 /* reserved for future use */ |
5afbbe0d | 17276 | + if (bindex == bbot) { |
4a4d8108 AM |
17277 | + /* keep this ino in rename case */ |
17278 | + goto out; | |
17279 | + } | |
17280 | +#endif | |
5afbbe0d | 17281 | + for (bindex = btop; bindex <= bbot; bindex++) |
4a4d8108 AM |
17282 | + if (au_h_iptr(inode, bindex) == h_inode) { |
17283 | + bfound = bindex; | |
17284 | + break; | |
17285 | + } | |
17286 | + if (bfound < 0) | |
1308ab2a | 17287 | + goto out; |
1facf9fc | 17288 | + |
5afbbe0d | 17289 | + for (bindex = btop; bindex <= bbot; bindex++) { |
4a4d8108 AM |
17290 | + h_i = au_h_iptr(inode, bindex); |
17291 | + if (!h_i) | |
17292 | + continue; | |
1facf9fc | 17293 | + |
4a4d8108 AM |
17294 | + err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0); |
17295 | + /* ignore this error */ | |
17296 | + /* bad action? */ | |
1facf9fc | 17297 | + } |
1facf9fc | 17298 | + |
4a4d8108 | 17299 | + /* children inode number will be broken */ |
1facf9fc | 17300 | + |
4f0767ce | 17301 | +out: |
4a4d8108 AM |
17302 | + AuTraceErr(err); |
17303 | + return err; | |
1facf9fc | 17304 | +} |
17305 | + | |
4a4d8108 | 17306 | +static int hn_gen_tree(struct dentry *dentry) |
1facf9fc | 17307 | +{ |
4a4d8108 AM |
17308 | + int err, i, j, ndentry; |
17309 | + struct au_dcsub_pages dpages; | |
17310 | + struct au_dpage *dpage; | |
17311 | + struct dentry **dentries; | |
1facf9fc | 17312 | + |
4a4d8108 AM |
17313 | + err = au_dpages_init(&dpages, GFP_NOFS); |
17314 | + if (unlikely(err)) | |
17315 | + goto out; | |
17316 | + err = au_dcsub_pages(&dpages, dentry, NULL, NULL); | |
17317 | + if (unlikely(err)) | |
17318 | + goto out_dpages; | |
1facf9fc | 17319 | + |
4a4d8108 AM |
17320 | + for (i = 0; i < dpages.ndpage; i++) { |
17321 | + dpage = dpages.dpages + i; | |
17322 | + dentries = dpage->dentries; | |
17323 | + ndentry = dpage->ndentry; | |
17324 | + for (j = 0; j < ndentry; j++) { | |
17325 | + struct dentry *d; | |
17326 | + | |
17327 | + d = dentries[j]; | |
17328 | + if (IS_ROOT(d)) | |
17329 | + continue; | |
17330 | + | |
4a4d8108 | 17331 | + au_digen_dec(d); |
5527c038 | 17332 | + if (d_really_is_positive(d)) |
4a4d8108 AM |
17333 | + /* todo: reset children xino? |
17334 | + cached children only? */ | |
5527c038 | 17335 | + au_iigen_dec(d_inode(d)); |
1308ab2a | 17336 | + } |
dece6358 | 17337 | + } |
1facf9fc | 17338 | + |
4f0767ce | 17339 | +out_dpages: |
4a4d8108 | 17340 | + au_dpages_free(&dpages); |
4f0767ce | 17341 | +out: |
dece6358 AM |
17342 | + return err; |
17343 | +} | |
17344 | + | |
1308ab2a | 17345 | +/* |
4a4d8108 | 17346 | + * return 0 if processed. |
1308ab2a | 17347 | + */ |
4a4d8108 AM |
17348 | +static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode, |
17349 | + const unsigned int isdir) | |
dece6358 | 17350 | +{ |
1308ab2a | 17351 | + int err; |
4a4d8108 AM |
17352 | + struct dentry *d; |
17353 | + struct qstr *dname; | |
1facf9fc | 17354 | + |
4a4d8108 AM |
17355 | + err = 1; |
17356 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17357 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17358 | + err = 0; |
17359 | + goto out; | |
17360 | + } | |
dece6358 | 17361 | + |
4a4d8108 AM |
17362 | + if (!isdir) { |
17363 | + AuDebugOn(!name); | |
17364 | + au_iigen_dec(inode); | |
027c5e7a | 17365 | + spin_lock(&inode->i_lock); |
c1595e42 | 17366 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { |
027c5e7a | 17367 | + spin_lock(&d->d_lock); |
4a4d8108 AM |
17368 | + dname = &d->d_name; |
17369 | + if (dname->len != nlen | |
027c5e7a AM |
17370 | + && memcmp(dname->name, name, nlen)) { |
17371 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 17372 | + continue; |
027c5e7a | 17373 | + } |
4a4d8108 | 17374 | + err = 0; |
4a4d8108 AM |
17375 | + au_digen_dec(d); |
17376 | + spin_unlock(&d->d_lock); | |
17377 | + break; | |
1facf9fc | 17378 | + } |
027c5e7a | 17379 | + spin_unlock(&inode->i_lock); |
1308ab2a | 17380 | + } else { |
027c5e7a | 17381 | + au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR); |
c1595e42 | 17382 | + d = d_find_any_alias(inode); |
4a4d8108 AM |
17383 | + if (!d) { |
17384 | + au_iigen_dec(inode); | |
17385 | + goto out; | |
17386 | + } | |
1facf9fc | 17387 | + |
027c5e7a | 17388 | + spin_lock(&d->d_lock); |
4a4d8108 | 17389 | + dname = &d->d_name; |
027c5e7a AM |
17390 | + if (dname->len == nlen && !memcmp(dname->name, name, nlen)) { |
17391 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 17392 | + err = hn_gen_tree(d); |
027c5e7a AM |
17393 | + spin_lock(&d->d_lock); |
17394 | + } | |
17395 | + spin_unlock(&d->d_lock); | |
4a4d8108 AM |
17396 | + dput(d); |
17397 | + } | |
1facf9fc | 17398 | + |
4f0767ce | 17399 | +out: |
4a4d8108 | 17400 | + AuTraceErr(err); |
1308ab2a | 17401 | + return err; |
17402 | +} | |
dece6358 | 17403 | + |
4a4d8108 | 17404 | +static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir) |
1facf9fc | 17405 | +{ |
4a4d8108 | 17406 | + int err; |
1facf9fc | 17407 | + |
5527c038 | 17408 | + if (IS_ROOT(dentry)) { |
0c3ec466 | 17409 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17410 | + return 0; |
17411 | + } | |
1308ab2a | 17412 | + |
4a4d8108 AM |
17413 | + err = 0; |
17414 | + if (!isdir) { | |
4a4d8108 | 17415 | + au_digen_dec(dentry); |
5527c038 JR |
17416 | + if (d_really_is_positive(dentry)) |
17417 | + au_iigen_dec(d_inode(dentry)); | |
4a4d8108 | 17418 | + } else { |
027c5e7a | 17419 | + au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR); |
5527c038 | 17420 | + if (d_really_is_positive(dentry)) |
4a4d8108 AM |
17421 | + err = hn_gen_tree(dentry); |
17422 | + } | |
17423 | + | |
17424 | + AuTraceErr(err); | |
17425 | + return err; | |
1facf9fc | 17426 | +} |
17427 | + | |
4a4d8108 | 17428 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17429 | + |
4a4d8108 AM |
17430 | +/* hnotify job flags */ |
17431 | +#define AuHnJob_XINO0 1 | |
17432 | +#define AuHnJob_GEN (1 << 1) | |
17433 | +#define AuHnJob_DIRENT (1 << 2) | |
17434 | +#define AuHnJob_ISDIR (1 << 3) | |
17435 | +#define AuHnJob_TRYXINO0 (1 << 4) | |
17436 | +#define AuHnJob_MNTPNT (1 << 5) | |
17437 | +#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name) | |
7f207e10 AM |
17438 | +#define au_fset_hnjob(flags, name) \ |
17439 | + do { (flags) |= AuHnJob_##name; } while (0) | |
17440 | +#define au_fclr_hnjob(flags, name) \ | |
17441 | + do { (flags) &= ~AuHnJob_##name; } while (0) | |
1facf9fc | 17442 | + |
4a4d8108 AM |
17443 | +enum { |
17444 | + AuHn_CHILD, | |
17445 | + AuHn_PARENT, | |
17446 | + AuHnLast | |
17447 | +}; | |
1facf9fc | 17448 | + |
4a4d8108 AM |
17449 | +struct au_hnotify_args { |
17450 | + struct inode *h_dir, *dir, *h_child_inode; | |
17451 | + u32 mask; | |
17452 | + unsigned int flags[AuHnLast]; | |
17453 | + unsigned int h_child_nlen; | |
17454 | + char h_child_name[]; | |
17455 | +}; | |
1facf9fc | 17456 | + |
4a4d8108 AM |
17457 | +struct hn_job_args { |
17458 | + unsigned int flags; | |
17459 | + struct inode *inode, *h_inode, *dir, *h_dir; | |
17460 | + struct dentry *dentry; | |
17461 | + char *h_name; | |
17462 | + int h_nlen; | |
17463 | +}; | |
1308ab2a | 17464 | + |
4a4d8108 AM |
17465 | +static int hn_job(struct hn_job_args *a) |
17466 | +{ | |
17467 | + const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR); | |
076b876e | 17468 | + int e; |
1308ab2a | 17469 | + |
4a4d8108 AM |
17470 | + /* reset xino */ |
17471 | + if (au_ftest_hnjob(a->flags, XINO0) && a->inode) | |
17472 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
1308ab2a | 17473 | + |
4a4d8108 AM |
17474 | + if (au_ftest_hnjob(a->flags, TRYXINO0) |
17475 | + && a->inode | |
17476 | + && a->h_inode) { | |
be118d29 | 17477 | + inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); |
38d290e6 JR |
17478 | + if (!a->h_inode->i_nlink |
17479 | + && !(a->h_inode->i_state & I_LINKABLE)) | |
4a4d8108 | 17480 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ |
3c1bdaff | 17481 | + inode_unlock_shared(a->h_inode); |
1308ab2a | 17482 | + } |
1facf9fc | 17483 | + |
4a4d8108 AM |
17484 | + /* make the generation obsolete */ |
17485 | + if (au_ftest_hnjob(a->flags, GEN)) { | |
076b876e | 17486 | + e = -1; |
4a4d8108 | 17487 | + if (a->inode) |
076b876e | 17488 | + e = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode, |
4a4d8108 | 17489 | + isdir); |
076b876e | 17490 | + if (e && a->dentry) |
4a4d8108 AM |
17491 | + hn_gen_by_name(a->dentry, isdir); |
17492 | + /* ignore this error */ | |
1facf9fc | 17493 | + } |
1facf9fc | 17494 | + |
4a4d8108 AM |
17495 | + /* make dir entries obsolete */ |
17496 | + if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) { | |
17497 | + struct au_vdir *vdir; | |
1facf9fc | 17498 | + |
4a4d8108 AM |
17499 | + vdir = au_ivdir(a->inode); |
17500 | + if (vdir) | |
17501 | + vdir->vd_jiffy = 0; | |
17502 | + /* IMustLock(a->inode); */ | |
be118d29 | 17503 | + /* inode_inc_iversion(a->inode); */ |
4a4d8108 | 17504 | + } |
1facf9fc | 17505 | + |
4a4d8108 AM |
17506 | + /* can do nothing but warn */ |
17507 | + if (au_ftest_hnjob(a->flags, MNTPNT) | |
17508 | + && a->dentry | |
17509 | + && d_mountpoint(a->dentry)) | |
523b37e3 | 17510 | + pr_warn("mount-point %pd is removed or renamed\n", a->dentry); |
1facf9fc | 17511 | + |
4a4d8108 | 17512 | + return 0; |
1308ab2a | 17513 | +} |
1facf9fc | 17514 | + |
1308ab2a | 17515 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17516 | + |
4a4d8108 AM |
17517 | +static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen, |
17518 | + struct inode *dir) | |
1308ab2a | 17519 | +{ |
4a4d8108 AM |
17520 | + struct dentry *dentry, *d, *parent; |
17521 | + struct qstr *dname; | |
1308ab2a | 17522 | + |
c1595e42 | 17523 | + parent = d_find_any_alias(dir); |
4a4d8108 AM |
17524 | + if (!parent) |
17525 | + return NULL; | |
1308ab2a | 17526 | + |
4a4d8108 | 17527 | + dentry = NULL; |
027c5e7a | 17528 | + spin_lock(&parent->d_lock); |
c1595e42 | 17529 | + list_for_each_entry(d, &parent->d_subdirs, d_child) { |
523b37e3 | 17530 | + /* AuDbg("%pd\n", d); */ |
027c5e7a | 17531 | + spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); |
4a4d8108 AM |
17532 | + dname = &d->d_name; |
17533 | + if (dname->len != nlen || memcmp(dname->name, name, nlen)) | |
027c5e7a AM |
17534 | + goto cont_unlock; |
17535 | + if (au_di(d)) | |
17536 | + au_digen_dec(d); | |
17537 | + else | |
17538 | + goto cont_unlock; | |
c1595e42 | 17539 | + if (au_dcount(d) > 0) { |
027c5e7a | 17540 | + dentry = dget_dlock(d); |
4a4d8108 | 17541 | + spin_unlock(&d->d_lock); |
027c5e7a | 17542 | + break; |
dece6358 | 17543 | + } |
1facf9fc | 17544 | + |
f6b6e03d | 17545 | +cont_unlock: |
027c5e7a | 17546 | + spin_unlock(&d->d_lock); |
1308ab2a | 17547 | + } |
027c5e7a | 17548 | + spin_unlock(&parent->d_lock); |
4a4d8108 | 17549 | + dput(parent); |
1facf9fc | 17550 | + |
4a4d8108 AM |
17551 | + if (dentry) |
17552 | + di_write_lock_child(dentry); | |
1308ab2a | 17553 | + |
4a4d8108 AM |
17554 | + return dentry; |
17555 | +} | |
dece6358 | 17556 | + |
4a4d8108 AM |
17557 | +static struct inode *lookup_wlock_by_ino(struct super_block *sb, |
17558 | + aufs_bindex_t bindex, ino_t h_ino) | |
17559 | +{ | |
17560 | + struct inode *inode; | |
17561 | + ino_t ino; | |
17562 | + int err; | |
17563 | + | |
17564 | + inode = NULL; | |
17565 | + err = au_xino_read(sb, bindex, h_ino, &ino); | |
17566 | + if (!err && ino) | |
17567 | + inode = ilookup(sb, ino); | |
17568 | + if (!inode) | |
17569 | + goto out; | |
17570 | + | |
17571 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17572 | + pr_warn("wrong root branch\n"); |
4a4d8108 AM |
17573 | + iput(inode); |
17574 | + inode = NULL; | |
17575 | + goto out; | |
1308ab2a | 17576 | + } |
17577 | + | |
4a4d8108 | 17578 | + ii_write_lock_child(inode); |
1308ab2a | 17579 | + |
4f0767ce | 17580 | +out: |
4a4d8108 | 17581 | + return inode; |
dece6358 AM |
17582 | +} |
17583 | + | |
4a4d8108 | 17584 | +static void au_hn_bh(void *_args) |
1facf9fc | 17585 | +{ |
4a4d8108 AM |
17586 | + struct au_hnotify_args *a = _args; |
17587 | + struct super_block *sb; | |
5afbbe0d | 17588 | + aufs_bindex_t bindex, bbot, bfound; |
4a4d8108 | 17589 | + unsigned char xino, try_iput; |
1facf9fc | 17590 | + int err; |
1308ab2a | 17591 | + struct inode *inode; |
4a4d8108 AM |
17592 | + ino_t h_ino; |
17593 | + struct hn_job_args args; | |
17594 | + struct dentry *dentry; | |
17595 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 17596 | + |
4a4d8108 AM |
17597 | + AuDebugOn(!_args); |
17598 | + AuDebugOn(!a->h_dir); | |
17599 | + AuDebugOn(!a->dir); | |
17600 | + AuDebugOn(!a->mask); | |
17601 | + AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n", | |
17602 | + a->mask, a->dir->i_ino, a->h_dir->i_ino, | |
17603 | + a->h_child_inode ? a->h_child_inode->i_ino : 0); | |
1facf9fc | 17604 | + |
4a4d8108 AM |
17605 | + inode = NULL; |
17606 | + dentry = NULL; | |
17607 | + /* | |
17608 | + * do not lock a->dir->i_mutex here | |
17609 | + * because of d_revalidate() may cause a deadlock. | |
17610 | + */ | |
17611 | + sb = a->dir->i_sb; | |
17612 | + AuDebugOn(!sb); | |
17613 | + sbinfo = au_sbi(sb); | |
17614 | + AuDebugOn(!sbinfo); | |
7f207e10 | 17615 | + si_write_lock(sb, AuLock_NOPLMW); |
1facf9fc | 17616 | + |
8b6a4947 AM |
17617 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) |
17618 | + switch (a->mask & FS_EVENTS_POSS_ON_CHILD) { | |
17619 | + case FS_MOVED_FROM: | |
17620 | + case FS_MOVED_TO: | |
17621 | + AuWarn1("DIRREN with UDBA may not work correctly " | |
17622 | + "for the direct rename(2)\n"); | |
17623 | + } | |
17624 | + | |
4a4d8108 AM |
17625 | + ii_read_lock_parent(a->dir); |
17626 | + bfound = -1; | |
5afbbe0d AM |
17627 | + bbot = au_ibbot(a->dir); |
17628 | + for (bindex = au_ibtop(a->dir); bindex <= bbot; bindex++) | |
4a4d8108 AM |
17629 | + if (au_h_iptr(a->dir, bindex) == a->h_dir) { |
17630 | + bfound = bindex; | |
17631 | + break; | |
17632 | + } | |
17633 | + ii_read_unlock(a->dir); | |
17634 | + if (unlikely(bfound < 0)) | |
17635 | + goto out; | |
1facf9fc | 17636 | + |
4a4d8108 AM |
17637 | + xino = !!au_opt_test(au_mntflags(sb), XINO); |
17638 | + h_ino = 0; | |
17639 | + if (a->h_child_inode) | |
17640 | + h_ino = a->h_child_inode->i_ino; | |
1facf9fc | 17641 | + |
4a4d8108 AM |
17642 | + if (a->h_child_nlen |
17643 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN) | |
17644 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT))) | |
17645 | + dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen, | |
17646 | + a->dir); | |
17647 | + try_iput = 0; | |
5527c038 JR |
17648 | + if (dentry && d_really_is_positive(dentry)) |
17649 | + inode = d_inode(dentry); | |
4a4d8108 AM |
17650 | + if (xino && !inode && h_ino |
17651 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0) | |
17652 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0) | |
17653 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) { | |
17654 | + inode = lookup_wlock_by_ino(sb, bfound, h_ino); | |
17655 | + try_iput = 1; | |
f0c0a007 | 17656 | + } |
1facf9fc | 17657 | + |
4a4d8108 AM |
17658 | + args.flags = a->flags[AuHn_CHILD]; |
17659 | + args.dentry = dentry; | |
17660 | + args.inode = inode; | |
17661 | + args.h_inode = a->h_child_inode; | |
17662 | + args.dir = a->dir; | |
17663 | + args.h_dir = a->h_dir; | |
17664 | + args.h_name = a->h_child_name; | |
17665 | + args.h_nlen = a->h_child_nlen; | |
17666 | + err = hn_job(&args); | |
17667 | + if (dentry) { | |
027c5e7a | 17668 | + if (au_di(dentry)) |
4a4d8108 AM |
17669 | + di_write_unlock(dentry); |
17670 | + dput(dentry); | |
17671 | + } | |
17672 | + if (inode && try_iput) { | |
17673 | + ii_write_unlock(inode); | |
17674 | + iput(inode); | |
17675 | + } | |
1facf9fc | 17676 | + |
4a4d8108 AM |
17677 | + ii_write_lock_parent(a->dir); |
17678 | + args.flags = a->flags[AuHn_PARENT]; | |
17679 | + args.dentry = NULL; | |
17680 | + args.inode = a->dir; | |
17681 | + args.h_inode = a->h_dir; | |
17682 | + args.dir = NULL; | |
17683 | + args.h_dir = NULL; | |
17684 | + args.h_name = NULL; | |
17685 | + args.h_nlen = 0; | |
17686 | + err = hn_job(&args); | |
17687 | + ii_write_unlock(a->dir); | |
1facf9fc | 17688 | + |
4f0767ce | 17689 | +out: |
4a4d8108 AM |
17690 | + iput(a->h_child_inode); |
17691 | + iput(a->h_dir); | |
17692 | + iput(a->dir); | |
027c5e7a AM |
17693 | + si_write_unlock(sb); |
17694 | + au_nwt_done(&sbinfo->si_nowait); | |
9f237c51 | 17695 | + au_kfree_rcu(a); |
dece6358 | 17696 | +} |
1facf9fc | 17697 | + |
4a4d8108 AM |
17698 | +/* ---------------------------------------------------------------------- */ |
17699 | + | |
17700 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
b62f1e65 | 17701 | + const struct qstr *h_child_qstr, struct inode *h_child_inode) |
dece6358 | 17702 | +{ |
4a4d8108 | 17703 | + int err, len; |
53392da6 | 17704 | + unsigned int flags[AuHnLast], f; |
4a4d8108 AM |
17705 | + unsigned char isdir, isroot, wh; |
17706 | + struct inode *dir; | |
17707 | + struct au_hnotify_args *args; | |
17708 | + char *p, *h_child_name; | |
dece6358 | 17709 | + |
1308ab2a | 17710 | + err = 0; |
4a4d8108 AM |
17711 | + AuDebugOn(!hnotify || !hnotify->hn_aufs_inode); |
17712 | + dir = igrab(hnotify->hn_aufs_inode); | |
17713 | + if (!dir) | |
17714 | + goto out; | |
1facf9fc | 17715 | + |
4a4d8108 AM |
17716 | + isroot = (dir->i_ino == AUFS_ROOT_INO); |
17717 | + wh = 0; | |
17718 | + h_child_name = (void *)h_child_qstr->name; | |
17719 | + len = h_child_qstr->len; | |
17720 | + if (h_child_name) { | |
17721 | + if (len > AUFS_WH_PFX_LEN | |
17722 | + && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
17723 | + h_child_name += AUFS_WH_PFX_LEN; | |
17724 | + len -= AUFS_WH_PFX_LEN; | |
17725 | + wh = 1; | |
17726 | + } | |
1facf9fc | 17727 | + } |
dece6358 | 17728 | + |
4a4d8108 AM |
17729 | + isdir = 0; |
17730 | + if (h_child_inode) | |
17731 | + isdir = !!S_ISDIR(h_child_inode->i_mode); | |
17732 | + flags[AuHn_PARENT] = AuHnJob_ISDIR; | |
17733 | + flags[AuHn_CHILD] = 0; | |
17734 | + if (isdir) | |
17735 | + flags[AuHn_CHILD] = AuHnJob_ISDIR; | |
17736 | + au_fset_hnjob(flags[AuHn_PARENT], DIRENT); | |
17737 | + au_fset_hnjob(flags[AuHn_CHILD], GEN); | |
fbc438ed | 17738 | + switch (mask & ALL_FSNOTIFY_DIRENT_EVENTS) { |
4a4d8108 AM |
17739 | + case FS_MOVED_FROM: |
17740 | + case FS_MOVED_TO: | |
17741 | + au_fset_hnjob(flags[AuHn_CHILD], XINO0); | |
17742 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
17743 | + /*FALLTHROUGH*/ | |
17744 | + case FS_CREATE: | |
fb47a38f | 17745 | + AuDebugOn(!h_child_name); |
4a4d8108 | 17746 | + break; |
1facf9fc | 17747 | + |
4a4d8108 AM |
17748 | + case FS_DELETE: |
17749 | + /* | |
17750 | + * aufs never be able to get this child inode. | |
17751 | + * revalidation should be in d_revalidate() | |
17752 | + * by checking i_nlink, i_generation or d_unhashed(). | |
17753 | + */ | |
17754 | + AuDebugOn(!h_child_name); | |
17755 | + au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0); | |
17756 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
17757 | + break; | |
dece6358 | 17758 | + |
4a4d8108 AM |
17759 | + default: |
17760 | + AuDebugOn(1); | |
17761 | + } | |
1308ab2a | 17762 | + |
4a4d8108 AM |
17763 | + if (wh) |
17764 | + h_child_inode = NULL; | |
1308ab2a | 17765 | + |
4a4d8108 AM |
17766 | + err = -ENOMEM; |
17767 | + /* iput() and kfree() will be called in au_hnotify() */ | |
4a4d8108 | 17768 | + args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS); |
4a4d8108 AM |
17769 | + if (unlikely(!args)) { |
17770 | + AuErr1("no memory\n"); | |
17771 | + iput(dir); | |
17772 | + goto out; | |
17773 | + } | |
17774 | + args->flags[AuHn_PARENT] = flags[AuHn_PARENT]; | |
17775 | + args->flags[AuHn_CHILD] = flags[AuHn_CHILD]; | |
17776 | + args->mask = mask; | |
17777 | + args->dir = dir; | |
17778 | + args->h_dir = igrab(h_dir); | |
17779 | + if (h_child_inode) | |
17780 | + h_child_inode = igrab(h_child_inode); /* can be NULL */ | |
17781 | + args->h_child_inode = h_child_inode; | |
17782 | + args->h_child_nlen = len; | |
17783 | + if (len) { | |
17784 | + p = (void *)args; | |
17785 | + p += sizeof(*args); | |
17786 | + memcpy(p, h_child_name, len); | |
17787 | + p[len] = 0; | |
1308ab2a | 17788 | + } |
1308ab2a | 17789 | + |
38d290e6 | 17790 | + /* NFS fires the event for silly-renamed one from kworker */ |
53392da6 | 17791 | + f = 0; |
38d290e6 JR |
17792 | + if (!dir->i_nlink |
17793 | + || (au_test_nfs(h_dir->i_sb) && (mask & FS_DELETE))) | |
53392da6 AM |
17794 | + f = AuWkq_NEST; |
17795 | + err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f); | |
4a4d8108 AM |
17796 | + if (unlikely(err)) { |
17797 | + pr_err("wkq %d\n", err); | |
17798 | + iput(args->h_child_inode); | |
17799 | + iput(args->h_dir); | |
17800 | + iput(args->dir); | |
9f237c51 | 17801 | + au_kfree_rcu(args); |
1facf9fc | 17802 | + } |
1facf9fc | 17803 | + |
4a4d8108 | 17804 | +out: |
1facf9fc | 17805 | + return err; |
17806 | +} | |
17807 | + | |
027c5e7a AM |
17808 | +/* ---------------------------------------------------------------------- */ |
17809 | + | |
17810 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
17811 | +{ | |
17812 | + int err; | |
17813 | + | |
17814 | + AuDebugOn(!(udba & AuOptMask_UDBA)); | |
17815 | + | |
17816 | + err = 0; | |
17817 | + if (au_hnotify_op.reset_br) | |
17818 | + err = au_hnotify_op.reset_br(udba, br, perm); | |
17819 | + | |
17820 | + return err; | |
17821 | +} | |
17822 | + | |
17823 | +int au_hnotify_init_br(struct au_branch *br, int perm) | |
17824 | +{ | |
17825 | + int err; | |
17826 | + | |
17827 | + err = 0; | |
17828 | + if (au_hnotify_op.init_br) | |
17829 | + err = au_hnotify_op.init_br(br, perm); | |
17830 | + | |
17831 | + return err; | |
17832 | +} | |
17833 | + | |
17834 | +void au_hnotify_fin_br(struct au_branch *br) | |
17835 | +{ | |
17836 | + if (au_hnotify_op.fin_br) | |
17837 | + au_hnotify_op.fin_br(br); | |
17838 | +} | |
17839 | + | |
4a4d8108 AM |
17840 | +static void au_hn_destroy_cache(void) |
17841 | +{ | |
1c60b727 AM |
17842 | + kmem_cache_destroy(au_cache[AuCache_HNOTIFY]); |
17843 | + au_cache[AuCache_HNOTIFY] = NULL; | |
4a4d8108 | 17844 | +} |
1308ab2a | 17845 | + |
4a4d8108 | 17846 | +int __init au_hnotify_init(void) |
1facf9fc | 17847 | +{ |
1308ab2a | 17848 | + int err; |
1308ab2a | 17849 | + |
4a4d8108 | 17850 | + err = -ENOMEM; |
1c60b727 AM |
17851 | + au_cache[AuCache_HNOTIFY] = AuCache(au_hnotify); |
17852 | + if (au_cache[AuCache_HNOTIFY]) { | |
027c5e7a AM |
17853 | + err = 0; |
17854 | + if (au_hnotify_op.init) | |
17855 | + err = au_hnotify_op.init(); | |
4a4d8108 AM |
17856 | + if (unlikely(err)) |
17857 | + au_hn_destroy_cache(); | |
1308ab2a | 17858 | + } |
1308ab2a | 17859 | + AuTraceErr(err); |
4a4d8108 | 17860 | + return err; |
1308ab2a | 17861 | +} |
17862 | + | |
4a4d8108 | 17863 | +void au_hnotify_fin(void) |
1308ab2a | 17864 | +{ |
027c5e7a AM |
17865 | + if (au_hnotify_op.fin) |
17866 | + au_hnotify_op.fin(); | |
f0c0a007 | 17867 | + |
4a4d8108 | 17868 | + /* cf. au_cache_fin() */ |
1c60b727 | 17869 | + if (au_cache[AuCache_HNOTIFY]) |
4a4d8108 | 17870 | + au_hn_destroy_cache(); |
dece6358 | 17871 | +} |
7f207e10 | 17872 | diff -urN /usr/share/empty/fs/aufs/iinfo.c linux/fs/aufs/iinfo.c |
eca34b5c | 17873 | --- /usr/share/empty/fs/aufs/iinfo.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 17874 | +++ linux/fs/aufs/iinfo.c 2020-01-27 10:57:18.175538316 +0100 |
062440b3 | 17875 | @@ -0,0 +1,286 @@ |
cd7a4cd9 | 17876 | +// SPDX-License-Identifier: GPL-2.0 |
dece6358 | 17877 | +/* |
016522bc | 17878 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
dece6358 AM |
17879 | + * |
17880 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17881 | + * it under the terms of the GNU General Public License as published by | |
17882 | + * the Free Software Foundation; either version 2 of the License, or | |
17883 | + * (at your option) any later version. | |
17884 | + * | |
17885 | + * This program is distributed in the hope that it will be useful, | |
17886 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17887 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17888 | + * GNU General Public License for more details. | |
17889 | + * | |
17890 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17891 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 | 17892 | + */ |
1facf9fc | 17893 | + |
dece6358 | 17894 | +/* |
4a4d8108 | 17895 | + * inode private data |
dece6358 | 17896 | + */ |
1facf9fc | 17897 | + |
1308ab2a | 17898 | +#include "aufs.h" |
1facf9fc | 17899 | + |
4a4d8108 | 17900 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 17901 | +{ |
4a4d8108 | 17902 | + struct inode *h_inode; |
5afbbe0d | 17903 | + struct au_hinode *hinode; |
1facf9fc | 17904 | + |
4a4d8108 | 17905 | + IiMustAnyLock(inode); |
1facf9fc | 17906 | + |
5afbbe0d AM |
17907 | + hinode = au_hinode(au_ii(inode), bindex); |
17908 | + h_inode = hinode->hi_inode; | |
4a4d8108 AM |
17909 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); |
17910 | + return h_inode; | |
17911 | +} | |
1facf9fc | 17912 | + |
4a4d8108 AM |
17913 | +/* todo: hard/soft set? */ |
17914 | +void au_hiput(struct au_hinode *hinode) | |
17915 | +{ | |
17916 | + au_hn_free(hinode); | |
17917 | + dput(hinode->hi_whdentry); | |
17918 | + iput(hinode->hi_inode); | |
17919 | +} | |
1facf9fc | 17920 | + |
4a4d8108 AM |
17921 | +unsigned int au_hi_flags(struct inode *inode, int isdir) |
17922 | +{ | |
17923 | + unsigned int flags; | |
17924 | + const unsigned int mnt_flags = au_mntflags(inode->i_sb); | |
1facf9fc | 17925 | + |
4a4d8108 AM |
17926 | + flags = 0; |
17927 | + if (au_opt_test(mnt_flags, XINO)) | |
17928 | + au_fset_hi(flags, XINO); | |
17929 | + if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) | |
17930 | + au_fset_hi(flags, HNOTIFY); | |
17931 | + return flags; | |
1facf9fc | 17932 | +} |
17933 | + | |
4a4d8108 AM |
17934 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
17935 | + struct inode *h_inode, unsigned int flags) | |
1308ab2a | 17936 | +{ |
4a4d8108 AM |
17937 | + struct au_hinode *hinode; |
17938 | + struct inode *hi; | |
17939 | + struct au_iinfo *iinfo = au_ii(inode); | |
1facf9fc | 17940 | + |
4a4d8108 | 17941 | + IiMustWriteLock(inode); |
dece6358 | 17942 | + |
5afbbe0d | 17943 | + hinode = au_hinode(iinfo, bindex); |
4a4d8108 AM |
17944 | + hi = hinode->hi_inode; |
17945 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
17946 | + | |
17947 | + if (hi) | |
17948 | + au_hiput(hinode); | |
17949 | + hinode->hi_inode = h_inode; | |
17950 | + if (h_inode) { | |
17951 | + int err; | |
17952 | + struct super_block *sb = inode->i_sb; | |
17953 | + struct au_branch *br; | |
17954 | + | |
027c5e7a AM |
17955 | + AuDebugOn(inode->i_mode |
17956 | + && (h_inode->i_mode & S_IFMT) | |
17957 | + != (inode->i_mode & S_IFMT)); | |
5afbbe0d | 17958 | + if (bindex == iinfo->ii_btop) |
4a4d8108 AM |
17959 | + au_cpup_igen(inode, h_inode); |
17960 | + br = au_sbr(sb, bindex); | |
17961 | + hinode->hi_id = br->br_id; | |
17962 | + if (au_ftest_hi(flags, XINO)) { | |
17963 | + err = au_xino_write(sb, bindex, h_inode->i_ino, | |
17964 | + inode->i_ino); | |
17965 | + if (unlikely(err)) | |
17966 | + AuIOErr1("failed au_xino_write() %d\n", err); | |
17967 | + } | |
17968 | + | |
17969 | + if (au_ftest_hi(flags, HNOTIFY) | |
17970 | + && au_br_hnotifyable(br->br_perm)) { | |
027c5e7a | 17971 | + err = au_hn_alloc(hinode, inode); |
4a4d8108 AM |
17972 | + if (unlikely(err)) |
17973 | + AuIOErr1("au_hn_alloc() %d\n", err); | |
1308ab2a | 17974 | + } |
17975 | + } | |
4a4d8108 | 17976 | +} |
dece6358 | 17977 | + |
4a4d8108 AM |
17978 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, |
17979 | + struct dentry *h_wh) | |
17980 | +{ | |
17981 | + struct au_hinode *hinode; | |
dece6358 | 17982 | + |
4a4d8108 AM |
17983 | + IiMustWriteLock(inode); |
17984 | + | |
5afbbe0d | 17985 | + hinode = au_hinode(au_ii(inode), bindex); |
4a4d8108 AM |
17986 | + AuDebugOn(hinode->hi_whdentry); |
17987 | + hinode->hi_whdentry = h_wh; | |
1facf9fc | 17988 | +} |
17989 | + | |
537831f9 | 17990 | +void au_update_iigen(struct inode *inode, int half) |
1308ab2a | 17991 | +{ |
537831f9 AM |
17992 | + struct au_iinfo *iinfo; |
17993 | + struct au_iigen *iigen; | |
17994 | + unsigned int sigen; | |
17995 | + | |
17996 | + sigen = au_sigen(inode->i_sb); | |
17997 | + iinfo = au_ii(inode); | |
17998 | + iigen = &iinfo->ii_generation; | |
be52b249 | 17999 | + spin_lock(&iigen->ig_spin); |
537831f9 AM |
18000 | + iigen->ig_generation = sigen; |
18001 | + if (half) | |
18002 | + au_ig_fset(iigen->ig_flags, HALF_REFRESHED); | |
18003 | + else | |
18004 | + au_ig_fclr(iigen->ig_flags, HALF_REFRESHED); | |
be52b249 | 18005 | + spin_unlock(&iigen->ig_spin); |
4a4d8108 | 18006 | +} |
1facf9fc | 18007 | + |
4a4d8108 AM |
18008 | +/* it may be called at remount time, too */ |
18009 | +void au_update_ibrange(struct inode *inode, int do_put_zero) | |
18010 | +{ | |
18011 | + struct au_iinfo *iinfo; | |
5afbbe0d | 18012 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 18013 | + |
5afbbe0d | 18014 | + AuDebugOn(au_is_bad_inode(inode)); |
4a4d8108 | 18015 | + IiMustWriteLock(inode); |
1facf9fc | 18016 | + |
5afbbe0d AM |
18017 | + iinfo = au_ii(inode); |
18018 | + if (do_put_zero && iinfo->ii_btop >= 0) { | |
18019 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; | |
4a4d8108 AM |
18020 | + bindex++) { |
18021 | + struct inode *h_i; | |
1facf9fc | 18022 | + |
5afbbe0d | 18023 | + h_i = au_hinode(iinfo, bindex)->hi_inode; |
38d290e6 JR |
18024 | + if (h_i |
18025 | + && !h_i->i_nlink | |
18026 | + && !(h_i->i_state & I_LINKABLE)) | |
027c5e7a AM |
18027 | + au_set_h_iptr(inode, bindex, NULL, 0); |
18028 | + } | |
4a4d8108 AM |
18029 | + } |
18030 | + | |
5afbbe0d AM |
18031 | + iinfo->ii_btop = -1; |
18032 | + iinfo->ii_bbot = -1; | |
18033 | + bbot = au_sbbot(inode->i_sb); | |
18034 | + for (bindex = 0; bindex <= bbot; bindex++) | |
18035 | + if (au_hinode(iinfo, bindex)->hi_inode) { | |
18036 | + iinfo->ii_btop = bindex; | |
4a4d8108 | 18037 | + break; |
027c5e7a | 18038 | + } |
5afbbe0d AM |
18039 | + if (iinfo->ii_btop >= 0) |
18040 | + for (bindex = bbot; bindex >= iinfo->ii_btop; bindex--) | |
18041 | + if (au_hinode(iinfo, bindex)->hi_inode) { | |
18042 | + iinfo->ii_bbot = bindex; | |
027c5e7a AM |
18043 | + break; |
18044 | + } | |
5afbbe0d | 18045 | + AuDebugOn(iinfo->ii_btop > iinfo->ii_bbot); |
1308ab2a | 18046 | +} |
1facf9fc | 18047 | + |
dece6358 | 18048 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18049 | + |
4a4d8108 | 18050 | +void au_icntnr_init_once(void *_c) |
dece6358 | 18051 | +{ |
4a4d8108 AM |
18052 | + struct au_icntnr *c = _c; |
18053 | + struct au_iinfo *iinfo = &c->iinfo; | |
1facf9fc | 18054 | + |
be52b249 | 18055 | + spin_lock_init(&iinfo->ii_generation.ig_spin); |
4a4d8108 AM |
18056 | + au_rw_init(&iinfo->ii_rwsem); |
18057 | + inode_init_once(&c->vfs_inode); | |
18058 | +} | |
1facf9fc | 18059 | + |
5afbbe0d AM |
18060 | +void au_hinode_init(struct au_hinode *hinode) |
18061 | +{ | |
18062 | + hinode->hi_inode = NULL; | |
18063 | + hinode->hi_id = -1; | |
18064 | + au_hn_init(hinode); | |
18065 | + hinode->hi_whdentry = NULL; | |
18066 | +} | |
18067 | + | |
4a4d8108 AM |
18068 | +int au_iinfo_init(struct inode *inode) |
18069 | +{ | |
18070 | + struct au_iinfo *iinfo; | |
18071 | + struct super_block *sb; | |
5afbbe0d | 18072 | + struct au_hinode *hi; |
4a4d8108 | 18073 | + int nbr, i; |
1facf9fc | 18074 | + |
4a4d8108 AM |
18075 | + sb = inode->i_sb; |
18076 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
5afbbe0d | 18077 | + nbr = au_sbbot(sb) + 1; |
4a4d8108 AM |
18078 | + if (unlikely(nbr <= 0)) |
18079 | + nbr = 1; | |
5afbbe0d AM |
18080 | + hi = kmalloc_array(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); |
18081 | + if (hi) { | |
acd2b654 | 18082 | + au_lcnt_inc(&au_sbi(sb)->si_ninodes); |
5afbbe0d AM |
18083 | + |
18084 | + iinfo->ii_hinode = hi; | |
18085 | + for (i = 0; i < nbr; i++, hi++) | |
18086 | + au_hinode_init(hi); | |
1facf9fc | 18087 | + |
537831f9 | 18088 | + iinfo->ii_generation.ig_generation = au_sigen(sb); |
5afbbe0d AM |
18089 | + iinfo->ii_btop = -1; |
18090 | + iinfo->ii_bbot = -1; | |
4a4d8108 AM |
18091 | + iinfo->ii_vdir = NULL; |
18092 | + return 0; | |
1308ab2a | 18093 | + } |
4a4d8108 AM |
18094 | + return -ENOMEM; |
18095 | +} | |
1facf9fc | 18096 | + |
e2f27e51 | 18097 | +int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink) |
4a4d8108 | 18098 | +{ |
5afbbe0d | 18099 | + int err, i; |
4a4d8108 | 18100 | + struct au_hinode *hip; |
1facf9fc | 18101 | + |
4a4d8108 AM |
18102 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
18103 | + | |
18104 | + err = -ENOMEM; | |
e2f27e51 AM |
18105 | + hip = au_krealloc(iinfo->ii_hinode, sizeof(*hip) * nbr, GFP_NOFS, |
18106 | + may_shrink); | |
4a4d8108 AM |
18107 | + if (hip) { |
18108 | + iinfo->ii_hinode = hip; | |
5afbbe0d AM |
18109 | + i = iinfo->ii_bbot + 1; |
18110 | + hip += i; | |
18111 | + for (; i < nbr; i++, hip++) | |
18112 | + au_hinode_init(hip); | |
4a4d8108 | 18113 | + err = 0; |
1308ab2a | 18114 | + } |
4a4d8108 | 18115 | + |
1308ab2a | 18116 | + return err; |
1facf9fc | 18117 | +} |
18118 | + | |
4a4d8108 | 18119 | +void au_iinfo_fin(struct inode *inode) |
1facf9fc | 18120 | +{ |
4a4d8108 AM |
18121 | + struct au_iinfo *iinfo; |
18122 | + struct au_hinode *hi; | |
18123 | + struct super_block *sb; | |
5afbbe0d | 18124 | + aufs_bindex_t bindex, bbot; |
b752ccd1 | 18125 | + const unsigned char unlinked = !inode->i_nlink; |
1308ab2a | 18126 | + |
5afbbe0d | 18127 | + AuDebugOn(au_is_bad_inode(inode)); |
1308ab2a | 18128 | + |
b752ccd1 | 18129 | + sb = inode->i_sb; |
acd2b654 | 18130 | + au_lcnt_dec(&au_sbi(sb)->si_ninodes); |
b752ccd1 AM |
18131 | + if (si_pid_test(sb)) |
18132 | + au_xino_delete_inode(inode, unlinked); | |
18133 | + else { | |
18134 | + /* | |
18135 | + * it is safe to hide the dependency between sbinfo and | |
18136 | + * sb->s_umount. | |
18137 | + */ | |
18138 | + lockdep_off(); | |
18139 | + si_noflush_read_lock(sb); | |
18140 | + au_xino_delete_inode(inode, unlinked); | |
18141 | + si_read_unlock(sb); | |
18142 | + lockdep_on(); | |
18143 | + } | |
18144 | + | |
5afbbe0d | 18145 | + iinfo = au_ii(inode); |
4a4d8108 | 18146 | + if (iinfo->ii_vdir) |
1c60b727 | 18147 | + au_vdir_free(iinfo->ii_vdir); |
1308ab2a | 18148 | + |
5afbbe0d | 18149 | + bindex = iinfo->ii_btop; |
b752ccd1 | 18150 | + if (bindex >= 0) { |
5afbbe0d AM |
18151 | + hi = au_hinode(iinfo, bindex); |
18152 | + bbot = iinfo->ii_bbot; | |
18153 | + while (bindex++ <= bbot) { | |
b752ccd1 | 18154 | + if (hi->hi_inode) |
4a4d8108 | 18155 | + au_hiput(hi); |
4a4d8108 AM |
18156 | + hi++; |
18157 | + } | |
18158 | + } | |
9f237c51 | 18159 | + au_kfree_rcu(iinfo->ii_hinode); |
4a4d8108 | 18160 | + AuRwDestroy(&iinfo->ii_rwsem); |
dece6358 | 18161 | +} |
7f207e10 | 18162 | diff -urN /usr/share/empty/fs/aufs/inode.c linux/fs/aufs/inode.c |
eca34b5c | 18163 | --- /usr/share/empty/fs/aufs/inode.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 18164 | +++ linux/fs/aufs/inode.c 2020-01-27 10:57:18.175538316 +0100 |
eca801bf | 18165 | @@ -0,0 +1,529 @@ |
cd7a4cd9 | 18166 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 18167 | +/* |
016522bc | 18168 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
18169 | + * |
18170 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18171 | + * it under the terms of the GNU General Public License as published by | |
18172 | + * the Free Software Foundation; either version 2 of the License, or | |
18173 | + * (at your option) any later version. | |
18174 | + * | |
18175 | + * This program is distributed in the hope that it will be useful, | |
18176 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18177 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18178 | + * GNU General Public License for more details. | |
18179 | + * | |
18180 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 18181 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 18182 | + */ |
1facf9fc | 18183 | + |
4a4d8108 AM |
18184 | +/* |
18185 | + * inode functions | |
18186 | + */ | |
1facf9fc | 18187 | + |
eca801bf | 18188 | +#include <linux/iversion.h> |
4a4d8108 | 18189 | +#include "aufs.h" |
1308ab2a | 18190 | + |
4a4d8108 AM |
18191 | +struct inode *au_igrab(struct inode *inode) |
18192 | +{ | |
18193 | + if (inode) { | |
18194 | + AuDebugOn(!atomic_read(&inode->i_count)); | |
027c5e7a | 18195 | + ihold(inode); |
1facf9fc | 18196 | + } |
4a4d8108 AM |
18197 | + return inode; |
18198 | +} | |
1facf9fc | 18199 | + |
4a4d8108 AM |
18200 | +static void au_refresh_hinode_attr(struct inode *inode, int do_version) |
18201 | +{ | |
18202 | + au_cpup_attr_all(inode, /*force*/0); | |
537831f9 | 18203 | + au_update_iigen(inode, /*half*/1); |
4a4d8108 | 18204 | + if (do_version) |
be118d29 | 18205 | + inode_inc_iversion(inode); |
dece6358 | 18206 | +} |
1facf9fc | 18207 | + |
027c5e7a | 18208 | +static int au_ii_refresh(struct inode *inode, int *update) |
dece6358 | 18209 | +{ |
e2f27e51 | 18210 | + int err, e, nbr; |
027c5e7a | 18211 | + umode_t type; |
4a4d8108 | 18212 | + aufs_bindex_t bindex, new_bindex; |
1308ab2a | 18213 | + struct super_block *sb; |
4a4d8108 | 18214 | + struct au_iinfo *iinfo; |
027c5e7a | 18215 | + struct au_hinode *p, *q, tmp; |
1facf9fc | 18216 | + |
5afbbe0d | 18217 | + AuDebugOn(au_is_bad_inode(inode)); |
4a4d8108 | 18218 | + IiMustWriteLock(inode); |
1facf9fc | 18219 | + |
027c5e7a | 18220 | + *update = 0; |
4a4d8108 | 18221 | + sb = inode->i_sb; |
e2f27e51 | 18222 | + nbr = au_sbbot(sb) + 1; |
027c5e7a | 18223 | + type = inode->i_mode & S_IFMT; |
4a4d8108 | 18224 | + iinfo = au_ii(inode); |
e2f27e51 | 18225 | + err = au_hinode_realloc(iinfo, nbr, /*may_shrink*/0); |
4a4d8108 | 18226 | + if (unlikely(err)) |
1308ab2a | 18227 | + goto out; |
1facf9fc | 18228 | + |
5afbbe0d AM |
18229 | + AuDebugOn(iinfo->ii_btop < 0); |
18230 | + p = au_hinode(iinfo, iinfo->ii_btop); | |
18231 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; | |
4a4d8108 AM |
18232 | + bindex++, p++) { |
18233 | + if (!p->hi_inode) | |
18234 | + continue; | |
1facf9fc | 18235 | + |
027c5e7a | 18236 | + AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT)); |
4a4d8108 AM |
18237 | + new_bindex = au_br_index(sb, p->hi_id); |
18238 | + if (new_bindex == bindex) | |
18239 | + continue; | |
1facf9fc | 18240 | + |
4a4d8108 | 18241 | + if (new_bindex < 0) { |
027c5e7a | 18242 | + *update = 1; |
4a4d8108 AM |
18243 | + au_hiput(p); |
18244 | + p->hi_inode = NULL; | |
18245 | + continue; | |
1308ab2a | 18246 | + } |
4a4d8108 | 18247 | + |
5afbbe0d AM |
18248 | + if (new_bindex < iinfo->ii_btop) |
18249 | + iinfo->ii_btop = new_bindex; | |
18250 | + if (iinfo->ii_bbot < new_bindex) | |
18251 | + iinfo->ii_bbot = new_bindex; | |
4a4d8108 | 18252 | + /* swap two lower inode, and loop again */ |
5afbbe0d | 18253 | + q = au_hinode(iinfo, new_bindex); |
4a4d8108 AM |
18254 | + tmp = *q; |
18255 | + *q = *p; | |
18256 | + *p = tmp; | |
18257 | + if (tmp.hi_inode) { | |
18258 | + bindex--; | |
18259 | + p--; | |
1308ab2a | 18260 | + } |
18261 | + } | |
4a4d8108 | 18262 | + au_update_ibrange(inode, /*do_put_zero*/0); |
e2f27e51 | 18263 | + au_hinode_realloc(iinfo, nbr, /*may_shrink*/1); /* harmless if err */ |
4a4d8108 AM |
18264 | + e = au_dy_irefresh(inode); |
18265 | + if (unlikely(e && !err)) | |
18266 | + err = e; | |
1facf9fc | 18267 | + |
4f0767ce | 18268 | +out: |
027c5e7a AM |
18269 | + AuTraceErr(err); |
18270 | + return err; | |
18271 | +} | |
18272 | + | |
b95c5147 AM |
18273 | +void au_refresh_iop(struct inode *inode, int force_getattr) |
18274 | +{ | |
18275 | + int type; | |
18276 | + struct au_sbinfo *sbi = au_sbi(inode->i_sb); | |
18277 | + const struct inode_operations *iop | |
18278 | + = force_getattr ? aufs_iop : sbi->si_iop_array; | |
18279 | + | |
18280 | + if (inode->i_op == iop) | |
18281 | + return; | |
18282 | + | |
18283 | + switch (inode->i_mode & S_IFMT) { | |
18284 | + case S_IFDIR: | |
18285 | + type = AuIop_DIR; | |
18286 | + break; | |
18287 | + case S_IFLNK: | |
18288 | + type = AuIop_SYMLINK; | |
18289 | + break; | |
18290 | + default: | |
18291 | + type = AuIop_OTHER; | |
18292 | + break; | |
18293 | + } | |
18294 | + | |
18295 | + inode->i_op = iop + type; | |
18296 | + /* unnecessary smp_wmb() */ | |
18297 | +} | |
18298 | + | |
027c5e7a AM |
18299 | +int au_refresh_hinode_self(struct inode *inode) |
18300 | +{ | |
18301 | + int err, update; | |
18302 | + | |
18303 | + err = au_ii_refresh(inode, &update); | |
18304 | + if (!err) | |
18305 | + au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode)); | |
18306 | + | |
18307 | + AuTraceErr(err); | |
4a4d8108 AM |
18308 | + return err; |
18309 | +} | |
1facf9fc | 18310 | + |
4a4d8108 AM |
18311 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry) |
18312 | +{ | |
027c5e7a | 18313 | + int err, e, update; |
4a4d8108 | 18314 | + unsigned int flags; |
027c5e7a | 18315 | + umode_t mode; |
5afbbe0d | 18316 | + aufs_bindex_t bindex, bbot; |
027c5e7a | 18317 | + unsigned char isdir; |
4a4d8108 AM |
18318 | + struct au_hinode *p; |
18319 | + struct au_iinfo *iinfo; | |
1facf9fc | 18320 | + |
027c5e7a | 18321 | + err = au_ii_refresh(inode, &update); |
4a4d8108 AM |
18322 | + if (unlikely(err)) |
18323 | + goto out; | |
18324 | + | |
18325 | + update = 0; | |
18326 | + iinfo = au_ii(inode); | |
5afbbe0d | 18327 | + p = au_hinode(iinfo, iinfo->ii_btop); |
027c5e7a AM |
18328 | + mode = (inode->i_mode & S_IFMT); |
18329 | + isdir = S_ISDIR(mode); | |
4a4d8108 | 18330 | + flags = au_hi_flags(inode, isdir); |
5afbbe0d AM |
18331 | + bbot = au_dbbot(dentry); |
18332 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { | |
5527c038 | 18333 | + struct inode *h_i, *h_inode; |
4a4d8108 AM |
18334 | + struct dentry *h_d; |
18335 | + | |
18336 | + h_d = au_h_dptr(dentry, bindex); | |
5527c038 | 18337 | + if (!h_d || d_is_negative(h_d)) |
4a4d8108 AM |
18338 | + continue; |
18339 | + | |
5527c038 JR |
18340 | + h_inode = d_inode(h_d); |
18341 | + AuDebugOn(mode != (h_inode->i_mode & S_IFMT)); | |
5afbbe0d | 18342 | + if (iinfo->ii_btop <= bindex && bindex <= iinfo->ii_bbot) { |
4a4d8108 AM |
18343 | + h_i = au_h_iptr(inode, bindex); |
18344 | + if (h_i) { | |
5527c038 | 18345 | + if (h_i == h_inode) |
4a4d8108 AM |
18346 | + continue; |
18347 | + err = -EIO; | |
18348 | + break; | |
18349 | + } | |
18350 | + } | |
5afbbe0d AM |
18351 | + if (bindex < iinfo->ii_btop) |
18352 | + iinfo->ii_btop = bindex; | |
18353 | + if (iinfo->ii_bbot < bindex) | |
18354 | + iinfo->ii_bbot = bindex; | |
5527c038 | 18355 | + au_set_h_iptr(inode, bindex, au_igrab(h_inode), flags); |
4a4d8108 | 18356 | + update = 1; |
1308ab2a | 18357 | + } |
4a4d8108 AM |
18358 | + au_update_ibrange(inode, /*do_put_zero*/0); |
18359 | + e = au_dy_irefresh(inode); | |
18360 | + if (unlikely(e && !err)) | |
18361 | + err = e; | |
027c5e7a AM |
18362 | + if (!err) |
18363 | + au_refresh_hinode_attr(inode, update && isdir); | |
4a4d8108 | 18364 | + |
4f0767ce | 18365 | +out: |
4a4d8108 | 18366 | + AuTraceErr(err); |
1308ab2a | 18367 | + return err; |
dece6358 AM |
18368 | +} |
18369 | + | |
4a4d8108 | 18370 | +static int set_inode(struct inode *inode, struct dentry *dentry) |
dece6358 | 18371 | +{ |
4a4d8108 AM |
18372 | + int err; |
18373 | + unsigned int flags; | |
18374 | + umode_t mode; | |
5afbbe0d | 18375 | + aufs_bindex_t bindex, btop, btail; |
4a4d8108 AM |
18376 | + unsigned char isdir; |
18377 | + struct dentry *h_dentry; | |
18378 | + struct inode *h_inode; | |
18379 | + struct au_iinfo *iinfo; | |
43982f53 | 18380 | + const struct inode_operations *iop; |
dece6358 | 18381 | + |
4a4d8108 | 18382 | + IiMustWriteLock(inode); |
dece6358 | 18383 | + |
4a4d8108 AM |
18384 | + err = 0; |
18385 | + isdir = 0; | |
b95c5147 | 18386 | + iop = au_sbi(inode->i_sb)->si_iop_array; |
5afbbe0d AM |
18387 | + btop = au_dbtop(dentry); |
18388 | + h_dentry = au_h_dptr(dentry, btop); | |
5527c038 | 18389 | + h_inode = d_inode(h_dentry); |
4a4d8108 AM |
18390 | + mode = h_inode->i_mode; |
18391 | + switch (mode & S_IFMT) { | |
18392 | + case S_IFREG: | |
18393 | + btail = au_dbtail(dentry); | |
b95c5147 | 18394 | + inode->i_op = iop + AuIop_OTHER; |
4a4d8108 | 18395 | + inode->i_fop = &aufs_file_fop; |
5afbbe0d | 18396 | + err = au_dy_iaop(inode, btop, h_inode); |
4a4d8108 AM |
18397 | + if (unlikely(err)) |
18398 | + goto out; | |
18399 | + break; | |
18400 | + case S_IFDIR: | |
18401 | + isdir = 1; | |
18402 | + btail = au_dbtaildir(dentry); | |
b95c5147 | 18403 | + inode->i_op = iop + AuIop_DIR; |
4a4d8108 AM |
18404 | + inode->i_fop = &aufs_dir_fop; |
18405 | + break; | |
18406 | + case S_IFLNK: | |
18407 | + btail = au_dbtail(dentry); | |
b95c5147 | 18408 | + inode->i_op = iop + AuIop_SYMLINK; |
4a4d8108 AM |
18409 | + break; |
18410 | + case S_IFBLK: | |
18411 | + case S_IFCHR: | |
18412 | + case S_IFIFO: | |
18413 | + case S_IFSOCK: | |
18414 | + btail = au_dbtail(dentry); | |
b95c5147 | 18415 | + inode->i_op = iop + AuIop_OTHER; |
38d290e6 | 18416 | + init_special_inode(inode, mode, h_inode->i_rdev); |
4a4d8108 AM |
18417 | + break; |
18418 | + default: | |
18419 | + AuIOErr("Unknown file type 0%o\n", mode); | |
18420 | + err = -EIO; | |
1308ab2a | 18421 | + goto out; |
4a4d8108 | 18422 | + } |
dece6358 | 18423 | + |
4a4d8108 AM |
18424 | + /* do not set hnotify for whiteouted dirs (SHWH mode) */ |
18425 | + flags = au_hi_flags(inode, isdir); | |
18426 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH) | |
18427 | + && au_ftest_hi(flags, HNOTIFY) | |
18428 | + && dentry->d_name.len > AUFS_WH_PFX_LEN | |
18429 | + && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) | |
18430 | + au_fclr_hi(flags, HNOTIFY); | |
18431 | + iinfo = au_ii(inode); | |
5afbbe0d AM |
18432 | + iinfo->ii_btop = btop; |
18433 | + iinfo->ii_bbot = btail; | |
18434 | + for (bindex = btop; bindex <= btail; bindex++) { | |
4a4d8108 AM |
18435 | + h_dentry = au_h_dptr(dentry, bindex); |
18436 | + if (h_dentry) | |
18437 | + au_set_h_iptr(inode, bindex, | |
5527c038 | 18438 | + au_igrab(d_inode(h_dentry)), flags); |
4a4d8108 AM |
18439 | + } |
18440 | + au_cpup_attr_all(inode, /*force*/1); | |
c1595e42 JR |
18441 | + /* |
18442 | + * to force calling aufs_get_acl() every time, | |
18443 | + * do not call cache_no_acl() for aufs inode. | |
18444 | + */ | |
dece6358 | 18445 | + |
4f0767ce | 18446 | +out: |
4a4d8108 AM |
18447 | + return err; |
18448 | +} | |
dece6358 | 18449 | + |
027c5e7a AM |
18450 | +/* |
18451 | + * successful returns with iinfo write_locked | |
18452 | + * minus: errno | |
18453 | + * zero: success, matched | |
18454 | + * plus: no error, but unmatched | |
18455 | + */ | |
18456 | +static int reval_inode(struct inode *inode, struct dentry *dentry) | |
4a4d8108 AM |
18457 | +{ |
18458 | + int err; | |
cfc41e69 | 18459 | + unsigned int gen, igflags; |
5afbbe0d | 18460 | + aufs_bindex_t bindex, bbot; |
4a4d8108 | 18461 | + struct inode *h_inode, *h_dinode; |
5527c038 | 18462 | + struct dentry *h_dentry; |
dece6358 | 18463 | + |
4a4d8108 AM |
18464 | + /* |
18465 | + * before this function, if aufs got any iinfo lock, it must be only | |
18466 | + * one, the parent dir. | |
18467 | + * it can happen by UDBA and the obsoleted inode number. | |
18468 | + */ | |
18469 | + err = -EIO; | |
18470 | + if (unlikely(inode->i_ino == parent_ino(dentry))) | |
18471 | + goto out; | |
18472 | + | |
027c5e7a | 18473 | + err = 1; |
4a4d8108 | 18474 | + ii_write_lock_new_child(inode); |
5afbbe0d | 18475 | + h_dentry = au_h_dptr(dentry, au_dbtop(dentry)); |
5527c038 | 18476 | + h_dinode = d_inode(h_dentry); |
5afbbe0d AM |
18477 | + bbot = au_ibbot(inode); |
18478 | + for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { | |
4a4d8108 | 18479 | + h_inode = au_h_iptr(inode, bindex); |
537831f9 AM |
18480 | + if (!h_inode || h_inode != h_dinode) |
18481 | + continue; | |
18482 | + | |
18483 | + err = 0; | |
cfc41e69 | 18484 | + gen = au_iigen(inode, &igflags); |
537831f9 | 18485 | + if (gen == au_digen(dentry) |
cfc41e69 | 18486 | + && !au_ig_ftest(igflags, HALF_REFRESHED)) |
4a4d8108 | 18487 | + break; |
537831f9 AM |
18488 | + |
18489 | + /* fully refresh inode using dentry */ | |
18490 | + err = au_refresh_hinode(inode, dentry); | |
18491 | + if (!err) | |
18492 | + au_update_iigen(inode, /*half*/0); | |
18493 | + break; | |
1facf9fc | 18494 | + } |
dece6358 | 18495 | + |
4a4d8108 AM |
18496 | + if (unlikely(err)) |
18497 | + ii_write_unlock(inode); | |
4f0767ce | 18498 | +out: |
1facf9fc | 18499 | + return err; |
18500 | +} | |
1facf9fc | 18501 | + |
4a4d8108 AM |
18502 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
18503 | + unsigned int d_type, ino_t *ino) | |
1facf9fc | 18504 | +{ |
521ced18 JR |
18505 | + int err, idx; |
18506 | + const int isnondir = d_type != DT_DIR; | |
1facf9fc | 18507 | + |
b752ccd1 | 18508 | + /* prevent hardlinked inode number from race condition */ |
521ced18 JR |
18509 | + if (isnondir) { |
18510 | + err = au_xinondir_enter(sb, bindex, h_ino, &idx); | |
18511 | + if (unlikely(err)) | |
18512 | + goto out; | |
4a4d8108 | 18513 | + } |
521ced18 | 18514 | + |
4a4d8108 AM |
18515 | + err = au_xino_read(sb, bindex, h_ino, ino); |
18516 | + if (unlikely(err)) | |
521ced18 | 18517 | + goto out_xinondir; |
1308ab2a | 18518 | + |
4a4d8108 AM |
18519 | + if (!*ino) { |
18520 | + err = -EIO; | |
18521 | + *ino = au_xino_new_ino(sb); | |
18522 | + if (unlikely(!*ino)) | |
521ced18 | 18523 | + goto out_xinondir; |
4a4d8108 AM |
18524 | + err = au_xino_write(sb, bindex, h_ino, *ino); |
18525 | + if (unlikely(err)) | |
521ced18 | 18526 | + goto out_xinondir; |
1308ab2a | 18527 | + } |
1facf9fc | 18528 | + |
521ced18 JR |
18529 | +out_xinondir: |
18530 | + if (isnondir && idx >= 0) | |
18531 | + au_xinondir_leave(sb, bindex, h_ino, idx); | |
4f0767ce | 18532 | +out: |
1facf9fc | 18533 | + return err; |
18534 | +} | |
18535 | + | |
4a4d8108 AM |
18536 | +/* successful returns with iinfo write_locked */ |
18537 | +/* todo: return with unlocked? */ | |
18538 | +struct inode *au_new_inode(struct dentry *dentry, int must_new) | |
1facf9fc | 18539 | +{ |
5527c038 | 18540 | + struct inode *inode, *h_inode; |
4a4d8108 AM |
18541 | + struct dentry *h_dentry; |
18542 | + struct super_block *sb; | |
18543 | + ino_t h_ino, ino; | |
521ced18 | 18544 | + int err, idx, hlinked; |
5afbbe0d | 18545 | + aufs_bindex_t btop; |
1facf9fc | 18546 | + |
4a4d8108 | 18547 | + sb = dentry->d_sb; |
5afbbe0d AM |
18548 | + btop = au_dbtop(dentry); |
18549 | + h_dentry = au_h_dptr(dentry, btop); | |
5527c038 JR |
18550 | + h_inode = d_inode(h_dentry); |
18551 | + h_ino = h_inode->i_ino; | |
521ced18 | 18552 | + hlinked = !d_is_dir(h_dentry) && h_inode->i_nlink > 1; |
b752ccd1 | 18553 | + |
521ced18 | 18554 | +new_ino: |
b752ccd1 AM |
18555 | + /* |
18556 | + * stop 'race'-ing between hardlinks under different | |
18557 | + * parents. | |
18558 | + */ | |
521ced18 JR |
18559 | + if (hlinked) { |
18560 | + err = au_xinondir_enter(sb, btop, h_ino, &idx); | |
18561 | + inode = ERR_PTR(err); | |
18562 | + if (unlikely(err)) | |
18563 | + goto out; | |
18564 | + } | |
b752ccd1 | 18565 | + |
5afbbe0d | 18566 | + err = au_xino_read(sb, btop, h_ino, &ino); |
4a4d8108 AM |
18567 | + inode = ERR_PTR(err); |
18568 | + if (unlikely(err)) | |
521ced18 | 18569 | + goto out_xinondir; |
b752ccd1 | 18570 | + |
4a4d8108 AM |
18571 | + if (!ino) { |
18572 | + ino = au_xino_new_ino(sb); | |
18573 | + if (unlikely(!ino)) { | |
18574 | + inode = ERR_PTR(-EIO); | |
521ced18 | 18575 | + goto out_xinondir; |
dece6358 AM |
18576 | + } |
18577 | + } | |
1facf9fc | 18578 | + |
4a4d8108 AM |
18579 | + AuDbg("i%lu\n", (unsigned long)ino); |
18580 | + inode = au_iget_locked(sb, ino); | |
18581 | + err = PTR_ERR(inode); | |
18582 | + if (IS_ERR(inode)) | |
521ced18 | 18583 | + goto out_xinondir; |
1facf9fc | 18584 | + |
4a4d8108 AM |
18585 | + AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW)); |
18586 | + if (inode->i_state & I_NEW) { | |
18587 | + ii_write_lock_new_child(inode); | |
18588 | + err = set_inode(inode, dentry); | |
18589 | + if (!err) { | |
18590 | + unlock_new_inode(inode); | |
521ced18 | 18591 | + goto out_xinondir; /* success */ |
4a4d8108 | 18592 | + } |
1308ab2a | 18593 | + |
027c5e7a AM |
18594 | + /* |
18595 | + * iget_failed() calls iput(), but we need to call | |
18596 | + * ii_write_unlock() after iget_failed(). so dirty hack for | |
18597 | + * i_count. | |
18598 | + */ | |
18599 | + atomic_inc(&inode->i_count); | |
4a4d8108 | 18600 | + iget_failed(inode); |
027c5e7a | 18601 | + ii_write_unlock(inode); |
5afbbe0d | 18602 | + au_xino_write(sb, btop, h_ino, /*ino*/0); |
027c5e7a AM |
18603 | + /* ignore this error */ |
18604 | + goto out_iput; | |
18605 | + } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) { | |
b752ccd1 AM |
18606 | + /* |
18607 | + * horrible race condition between lookup, readdir and copyup | |
18608 | + * (or something). | |
18609 | + */ | |
521ced18 JR |
18610 | + if (hlinked && idx >= 0) |
18611 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
027c5e7a AM |
18612 | + err = reval_inode(inode, dentry); |
18613 | + if (unlikely(err < 0)) { | |
521ced18 | 18614 | + hlinked = 0; |
027c5e7a AM |
18615 | + goto out_iput; |
18616 | + } | |
521ced18 | 18617 | + if (!err) |
4a4d8108 | 18618 | + goto out; /* success */ |
521ced18 JR |
18619 | + else if (hlinked && idx >= 0) { |
18620 | + err = au_xinondir_enter(sb, btop, h_ino, &idx); | |
18621 | + if (unlikely(err)) { | |
18622 | + iput(inode); | |
18623 | + inode = ERR_PTR(err); | |
18624 | + goto out; | |
18625 | + } | |
18626 | + } | |
4a4d8108 AM |
18627 | + } |
18628 | + | |
5527c038 | 18629 | + if (unlikely(au_test_fs_unique_ino(h_inode))) |
4a4d8108 | 18630 | + AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir," |
523b37e3 | 18631 | + " b%d, %s, %pd, hi%lu, i%lu.\n", |
5afbbe0d | 18632 | + btop, au_sbtype(h_dentry->d_sb), dentry, |
4a4d8108 AM |
18633 | + (unsigned long)h_ino, (unsigned long)ino); |
18634 | + ino = 0; | |
5afbbe0d | 18635 | + err = au_xino_write(sb, btop, h_ino, /*ino*/0); |
4a4d8108 AM |
18636 | + if (!err) { |
18637 | + iput(inode); | |
521ced18 JR |
18638 | + if (hlinked && idx >= 0) |
18639 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
4a4d8108 AM |
18640 | + goto new_ino; |
18641 | + } | |
1308ab2a | 18642 | + |
4f0767ce | 18643 | +out_iput: |
4a4d8108 | 18644 | + iput(inode); |
4a4d8108 | 18645 | + inode = ERR_PTR(err); |
521ced18 JR |
18646 | +out_xinondir: |
18647 | + if (hlinked && idx >= 0) | |
18648 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
4f0767ce | 18649 | +out: |
4a4d8108 | 18650 | + return inode; |
1facf9fc | 18651 | +} |
18652 | + | |
4a4d8108 | 18653 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18654 | + |
4a4d8108 AM |
18655 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, |
18656 | + struct inode *inode) | |
18657 | +{ | |
18658 | + int err; | |
076b876e | 18659 | + struct inode *hi; |
1facf9fc | 18660 | + |
4a4d8108 | 18661 | + err = au_br_rdonly(au_sbr(sb, bindex)); |
1facf9fc | 18662 | + |
4a4d8108 AM |
18663 | + /* pseudo-link after flushed may happen out of bounds */ |
18664 | + if (!err | |
18665 | + && inode | |
5afbbe0d AM |
18666 | + && au_ibtop(inode) <= bindex |
18667 | + && bindex <= au_ibbot(inode)) { | |
4a4d8108 AM |
18668 | + /* |
18669 | + * permission check is unnecessary since vfsub routine | |
18670 | + * will be called later | |
18671 | + */ | |
076b876e | 18672 | + hi = au_h_iptr(inode, bindex); |
4a4d8108 AM |
18673 | + if (hi) |
18674 | + err = IS_IMMUTABLE(hi) ? -EROFS : 0; | |
1facf9fc | 18675 | + } |
18676 | + | |
4a4d8108 AM |
18677 | + return err; |
18678 | +} | |
dece6358 | 18679 | + |
4a4d8108 AM |
18680 | +int au_test_h_perm(struct inode *h_inode, int mask) |
18681 | +{ | |
2dfbb274 | 18682 | + if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
4a4d8108 AM |
18683 | + return 0; |
18684 | + return inode_permission(h_inode, mask); | |
18685 | +} | |
1facf9fc | 18686 | + |
4a4d8108 AM |
18687 | +int au_test_h_perm_sio(struct inode *h_inode, int mask) |
18688 | +{ | |
18689 | + if (au_test_nfs(h_inode->i_sb) | |
18690 | + && (mask & MAY_WRITE) | |
18691 | + && S_ISDIR(h_inode->i_mode)) | |
18692 | + mask |= MAY_READ; /* force permission check */ | |
18693 | + return au_test_h_perm(h_inode, mask); | |
1facf9fc | 18694 | +} |
7f207e10 | 18695 | diff -urN /usr/share/empty/fs/aufs/inode.h linux/fs/aufs/inode.h |
eca34b5c | 18696 | --- /usr/share/empty/fs/aufs/inode.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 18697 | +++ linux/fs/aufs/inode.h 2020-01-27 10:57:18.175538316 +0100 |
9f237c51 | 18698 | @@ -0,0 +1,698 @@ |
062440b3 | 18699 | +/* SPDX-License-Identifier: GPL-2.0 */ |
4a4d8108 | 18700 | +/* |
016522bc | 18701 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
18702 | + * |
18703 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18704 | + * it under the terms of the GNU General Public License as published by | |
18705 | + * the Free Software Foundation; either version 2 of the License, or | |
18706 | + * (at your option) any later version. | |
18707 | + * | |
18708 | + * This program is distributed in the hope that it will be useful, | |
18709 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18710 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18711 | + * GNU General Public License for more details. | |
18712 | + * | |
18713 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 18714 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 18715 | + */ |
1facf9fc | 18716 | + |
1308ab2a | 18717 | +/* |
4a4d8108 | 18718 | + * inode operations |
1308ab2a | 18719 | + */ |
dece6358 | 18720 | + |
4a4d8108 AM |
18721 | +#ifndef __AUFS_INODE_H__ |
18722 | +#define __AUFS_INODE_H__ | |
dece6358 | 18723 | + |
4a4d8108 | 18724 | +#ifdef __KERNEL__ |
1308ab2a | 18725 | + |
4a4d8108 | 18726 | +#include <linux/fsnotify.h> |
4a4d8108 | 18727 | +#include "rwsem.h" |
1308ab2a | 18728 | + |
4a4d8108 | 18729 | +struct vfsmount; |
1facf9fc | 18730 | + |
4a4d8108 AM |
18731 | +struct au_hnotify { |
18732 | +#ifdef CONFIG_AUFS_HNOTIFY | |
18733 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
7f207e10 | 18734 | + /* never use fsnotify_add_vfsmount_mark() */ |
0c5527e5 | 18735 | + struct fsnotify_mark hn_mark; |
4a4d8108 | 18736 | +#endif |
1c60b727 | 18737 | + struct inode *hn_aufs_inode; /* no get/put */ |
9f237c51 | 18738 | + struct rcu_head rcu; |
4a4d8108 AM |
18739 | +#endif |
18740 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 18741 | + |
4a4d8108 AM |
18742 | +struct au_hinode { |
18743 | + struct inode *hi_inode; | |
18744 | + aufs_bindex_t hi_id; | |
18745 | +#ifdef CONFIG_AUFS_HNOTIFY | |
18746 | + struct au_hnotify *hi_notify; | |
18747 | +#endif | |
dece6358 | 18748 | + |
4a4d8108 AM |
18749 | + /* reference to the copied-up whiteout with get/put */ |
18750 | + struct dentry *hi_whdentry; | |
18751 | +}; | |
dece6358 | 18752 | + |
537831f9 AM |
18753 | +/* ig_flags */ |
18754 | +#define AuIG_HALF_REFRESHED 1 | |
18755 | +#define au_ig_ftest(flags, name) ((flags) & AuIG_##name) | |
18756 | +#define au_ig_fset(flags, name) \ | |
18757 | + do { (flags) |= AuIG_##name; } while (0) | |
18758 | +#define au_ig_fclr(flags, name) \ | |
18759 | + do { (flags) &= ~AuIG_##name; } while (0) | |
18760 | + | |
18761 | +struct au_iigen { | |
be52b249 | 18762 | + spinlock_t ig_spin; |
537831f9 AM |
18763 | + __u32 ig_generation, ig_flags; |
18764 | +}; | |
18765 | + | |
4a4d8108 AM |
18766 | +struct au_vdir; |
18767 | +struct au_iinfo { | |
7a9e40b8 | 18768 | + struct au_iigen ii_generation; |
4a4d8108 | 18769 | + struct super_block *ii_hsb1; /* no get/put */ |
1facf9fc | 18770 | + |
4a4d8108 | 18771 | + struct au_rwsem ii_rwsem; |
5afbbe0d | 18772 | + aufs_bindex_t ii_btop, ii_bbot; |
4a4d8108 AM |
18773 | + __u32 ii_higen; |
18774 | + struct au_hinode *ii_hinode; | |
18775 | + struct au_vdir *ii_vdir; | |
18776 | +}; | |
1facf9fc | 18777 | + |
4a4d8108 | 18778 | +struct au_icntnr { |
9f237c51 AM |
18779 | + struct au_iinfo iinfo; |
18780 | + struct inode vfs_inode; | |
18781 | + struct hlist_bl_node plink; | |
18782 | + struct rcu_head rcu; | |
4a4d8108 | 18783 | +} ____cacheline_aligned_in_smp; |
1308ab2a | 18784 | + |
4a4d8108 AM |
18785 | +/* au_pin flags */ |
18786 | +#define AuPin_DI_LOCKED 1 | |
18787 | +#define AuPin_MNT_WRITE (1 << 1) | |
18788 | +#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) | |
7f207e10 AM |
18789 | +#define au_fset_pin(flags, name) \ |
18790 | + do { (flags) |= AuPin_##name; } while (0) | |
18791 | +#define au_fclr_pin(flags, name) \ | |
18792 | + do { (flags) &= ~AuPin_##name; } while (0) | |
4a4d8108 AM |
18793 | + |
18794 | +struct au_pin { | |
18795 | + /* input */ | |
18796 | + struct dentry *dentry; | |
18797 | + unsigned int udba; | |
18798 | + unsigned char lsc_di, lsc_hi, flags; | |
18799 | + aufs_bindex_t bindex; | |
18800 | + | |
18801 | + /* output */ | |
18802 | + struct dentry *parent; | |
18803 | + struct au_hinode *hdir; | |
18804 | + struct vfsmount *h_mnt; | |
86dc4139 AM |
18805 | + |
18806 | + /* temporary unlock/relock for copyup */ | |
18807 | + struct dentry *h_dentry, *h_parent; | |
18808 | + struct au_branch *br; | |
18809 | + struct task_struct *task; | |
4a4d8108 | 18810 | +}; |
1facf9fc | 18811 | + |
86dc4139 | 18812 | +void au_pin_hdir_unlock(struct au_pin *p); |
c1595e42 | 18813 | +int au_pin_hdir_lock(struct au_pin *p); |
86dc4139 | 18814 | +int au_pin_hdir_relock(struct au_pin *p); |
86dc4139 AM |
18815 | +void au_pin_hdir_acquire_nest(struct au_pin *p); |
18816 | +void au_pin_hdir_release(struct au_pin *p); | |
18817 | + | |
1308ab2a | 18818 | +/* ---------------------------------------------------------------------- */ |
18819 | + | |
4a4d8108 | 18820 | +static inline struct au_iinfo *au_ii(struct inode *inode) |
1facf9fc | 18821 | +{ |
5afbbe0d AM |
18822 | + BUG_ON(is_bad_inode(inode)); |
18823 | + return &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
4a4d8108 | 18824 | +} |
1facf9fc | 18825 | + |
4a4d8108 | 18826 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18827 | + |
4a4d8108 AM |
18828 | +/* inode.c */ |
18829 | +struct inode *au_igrab(struct inode *inode); | |
b95c5147 | 18830 | +void au_refresh_iop(struct inode *inode, int force_getattr); |
027c5e7a | 18831 | +int au_refresh_hinode_self(struct inode *inode); |
4a4d8108 AM |
18832 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry); |
18833 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
18834 | + unsigned int d_type, ino_t *ino); | |
18835 | +struct inode *au_new_inode(struct dentry *dentry, int must_new); | |
18836 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, | |
18837 | + struct inode *inode); | |
18838 | +int au_test_h_perm(struct inode *h_inode, int mask); | |
18839 | +int au_test_h_perm_sio(struct inode *h_inode, int mask); | |
1facf9fc | 18840 | + |
4a4d8108 AM |
18841 | +static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, |
18842 | + ino_t h_ino, unsigned int d_type, ino_t *ino) | |
18843 | +{ | |
18844 | +#ifdef CONFIG_AUFS_SHWH | |
18845 | + return au_ino(sb, bindex, h_ino, d_type, ino); | |
18846 | +#else | |
18847 | + return 0; | |
18848 | +#endif | |
18849 | +} | |
1facf9fc | 18850 | + |
4a4d8108 | 18851 | +/* i_op.c */ |
b95c5147 AM |
18852 | +enum { |
18853 | + AuIop_SYMLINK, | |
18854 | + AuIop_DIR, | |
18855 | + AuIop_OTHER, | |
18856 | + AuIop_Last | |
18857 | +}; | |
43982f53 | 18858 | +extern struct inode_operations aufs_iop[AuIop_Last], /* not const */ |
b95c5147 | 18859 | + aufs_iop_nogetattr[AuIop_Last]; |
1308ab2a | 18860 | + |
4a4d8108 AM |
18861 | +/* au_wr_dir flags */ |
18862 | +#define AuWrDir_ADD_ENTRY 1 | |
7e9cd9fe AM |
18863 | +#define AuWrDir_ISDIR (1 << 1) |
18864 | +#define AuWrDir_TMPFILE (1 << 2) | |
4a4d8108 | 18865 | +#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) |
7f207e10 AM |
18866 | +#define au_fset_wrdir(flags, name) \ |
18867 | + do { (flags) |= AuWrDir_##name; } while (0) | |
18868 | +#define au_fclr_wrdir(flags, name) \ | |
18869 | + do { (flags) &= ~AuWrDir_##name; } while (0) | |
1facf9fc | 18870 | + |
4a4d8108 AM |
18871 | +struct au_wr_dir_args { |
18872 | + aufs_bindex_t force_btgt; | |
18873 | + unsigned char flags; | |
18874 | +}; | |
18875 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
18876 | + struct au_wr_dir_args *args); | |
dece6358 | 18877 | + |
4a4d8108 AM |
18878 | +struct dentry *au_pinned_h_parent(struct au_pin *pin); |
18879 | +void au_pin_init(struct au_pin *pin, struct dentry *dentry, | |
18880 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
18881 | + unsigned int udba, unsigned char flags); | |
18882 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
18883 | + unsigned int udba, unsigned char flags) __must_check; | |
18884 | +int au_do_pin(struct au_pin *pin) __must_check; | |
18885 | +void au_unpin(struct au_pin *pin); | |
c1595e42 JR |
18886 | +int au_reval_for_attr(struct dentry *dentry, unsigned int sigen); |
18887 | + | |
18888 | +#define AuIcpup_DID_CPUP 1 | |
18889 | +#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) | |
18890 | +#define au_fset_icpup(flags, name) \ | |
18891 | + do { (flags) |= AuIcpup_##name; } while (0) | |
18892 | +#define au_fclr_icpup(flags, name) \ | |
18893 | + do { (flags) &= ~AuIcpup_##name; } while (0) | |
18894 | + | |
18895 | +struct au_icpup_args { | |
18896 | + unsigned char flags; | |
18897 | + unsigned char pin_flags; | |
18898 | + aufs_bindex_t btgt; | |
18899 | + unsigned int udba; | |
18900 | + struct au_pin pin; | |
18901 | + struct path h_path; | |
18902 | + struct inode *h_inode; | |
18903 | +}; | |
18904 | + | |
18905 | +int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, | |
18906 | + struct au_icpup_args *a); | |
18907 | + | |
a2654f78 AM |
18908 | +int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, |
18909 | + int locked); | |
1facf9fc | 18910 | + |
4a4d8108 AM |
18911 | +/* i_op_add.c */ |
18912 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
18913 | + struct dentry *h_parent, int isdir); | |
7eafdf33 AM |
18914 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
18915 | + dev_t dev); | |
4a4d8108 | 18916 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); |
7eafdf33 | 18917 | +int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
b4510431 | 18918 | + bool want_excl); |
b912730e AM |
18919 | +struct vfsub_aopen_args; |
18920 | +int au_aopen_or_create(struct inode *dir, struct dentry *dentry, | |
18921 | + struct vfsub_aopen_args *args); | |
38d290e6 | 18922 | +int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode); |
4a4d8108 AM |
18923 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, |
18924 | + struct dentry *dentry); | |
7eafdf33 | 18925 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
1facf9fc | 18926 | + |
4a4d8108 AM |
18927 | +/* i_op_del.c */ |
18928 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); | |
18929 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
18930 | + struct dentry *h_parent, int isdir); | |
18931 | +int aufs_unlink(struct inode *dir, struct dentry *dentry); | |
18932 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry); | |
1308ab2a | 18933 | + |
4a4d8108 AM |
18934 | +/* i_op_ren.c */ |
18935 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); | |
18936 | +int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, | |
f2c43d5f AM |
18937 | + struct inode *dir, struct dentry *dentry, |
18938 | + unsigned int flags); | |
1facf9fc | 18939 | + |
4a4d8108 AM |
18940 | +/* iinfo.c */ |
18941 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); | |
18942 | +void au_hiput(struct au_hinode *hinode); | |
18943 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, | |
18944 | + struct dentry *h_wh); | |
18945 | +unsigned int au_hi_flags(struct inode *inode, int isdir); | |
1308ab2a | 18946 | + |
4a4d8108 AM |
18947 | +/* hinode flags */ |
18948 | +#define AuHi_XINO 1 | |
18949 | +#define AuHi_HNOTIFY (1 << 1) | |
18950 | +#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) | |
7f207e10 AM |
18951 | +#define au_fset_hi(flags, name) \ |
18952 | + do { (flags) |= AuHi_##name; } while (0) | |
18953 | +#define au_fclr_hi(flags, name) \ | |
18954 | + do { (flags) &= ~AuHi_##name; } while (0) | |
1facf9fc | 18955 | + |
4a4d8108 AM |
18956 | +#ifndef CONFIG_AUFS_HNOTIFY |
18957 | +#undef AuHi_HNOTIFY | |
18958 | +#define AuHi_HNOTIFY 0 | |
18959 | +#endif | |
1facf9fc | 18960 | + |
4a4d8108 AM |
18961 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
18962 | + struct inode *h_inode, unsigned int flags); | |
1facf9fc | 18963 | + |
537831f9 | 18964 | +void au_update_iigen(struct inode *inode, int half); |
4a4d8108 | 18965 | +void au_update_ibrange(struct inode *inode, int do_put_zero); |
1facf9fc | 18966 | + |
4a4d8108 | 18967 | +void au_icntnr_init_once(void *_c); |
5afbbe0d | 18968 | +void au_hinode_init(struct au_hinode *hinode); |
4a4d8108 AM |
18969 | +int au_iinfo_init(struct inode *inode); |
18970 | +void au_iinfo_fin(struct inode *inode); | |
e2f27e51 | 18971 | +int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink); |
1308ab2a | 18972 | + |
e49829fe | 18973 | +#ifdef CONFIG_PROC_FS |
4a4d8108 | 18974 | +/* plink.c */ |
e49829fe | 18975 | +int au_plink_maint(struct super_block *sb, int flags); |
7e9cd9fe | 18976 | +struct au_sbinfo; |
e49829fe JR |
18977 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo); |
18978 | +int au_plink_maint_enter(struct super_block *sb); | |
4a4d8108 AM |
18979 | +#ifdef CONFIG_AUFS_DEBUG |
18980 | +void au_plink_list(struct super_block *sb); | |
18981 | +#else | |
18982 | +AuStubVoid(au_plink_list, struct super_block *sb) | |
18983 | +#endif | |
18984 | +int au_plink_test(struct inode *inode); | |
18985 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); | |
18986 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
18987 | + struct dentry *h_dentry); | |
e49829fe JR |
18988 | +void au_plink_put(struct super_block *sb, int verbose); |
18989 | +void au_plink_clean(struct super_block *sb, int verbose); | |
4a4d8108 | 18990 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); |
e49829fe JR |
18991 | +#else |
18992 | +AuStubInt0(au_plink_maint, struct super_block *sb, int flags); | |
18993 | +AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo); | |
18994 | +AuStubInt0(au_plink_maint_enter, struct super_block *sb); | |
18995 | +AuStubVoid(au_plink_list, struct super_block *sb); | |
18996 | +AuStubInt0(au_plink_test, struct inode *inode); | |
18997 | +AuStub(struct dentry *, au_plink_lkup, return NULL, | |
18998 | + struct inode *inode, aufs_bindex_t bindex); | |
18999 | +AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex, | |
19000 | + struct dentry *h_dentry); | |
19001 | +AuStubVoid(au_plink_put, struct super_block *sb, int verbose); | |
19002 | +AuStubVoid(au_plink_clean, struct super_block *sb, int verbose); | |
19003 | +AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id); | |
19004 | +#endif /* CONFIG_PROC_FS */ | |
1facf9fc | 19005 | + |
c1595e42 JR |
19006 | +#ifdef CONFIG_AUFS_XATTR |
19007 | +/* xattr.c */ | |
7e9cd9fe AM |
19008 | +int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, |
19009 | + unsigned int verbose); | |
c1595e42 | 19010 | +ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size); |
f2c43d5f | 19011 | +void au_xattr_init(struct super_block *sb); |
c1595e42 JR |
19012 | +#else |
19013 | +AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src, | |
7e9cd9fe | 19014 | + int ignore_flags, unsigned int verbose); |
f2c43d5f | 19015 | +AuStubVoid(au_xattr_init, struct super_block *sb); |
c1595e42 JR |
19016 | +#endif |
19017 | + | |
19018 | +#ifdef CONFIG_FS_POSIX_ACL | |
19019 | +struct posix_acl *aufs_get_acl(struct inode *inode, int type); | |
19020 | +int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type); | |
19021 | +#endif | |
19022 | + | |
19023 | +#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) | |
19024 | +enum { | |
19025 | + AU_XATTR_SET, | |
c1595e42 JR |
19026 | + AU_ACL_SET |
19027 | +}; | |
19028 | + | |
f2c43d5f | 19029 | +struct au_sxattr { |
c1595e42 JR |
19030 | + int type; |
19031 | + union { | |
19032 | + struct { | |
19033 | + const char *name; | |
19034 | + const void *value; | |
19035 | + size_t size; | |
19036 | + int flags; | |
19037 | + } set; | |
19038 | + struct { | |
c1595e42 JR |
19039 | + struct posix_acl *acl; |
19040 | + int type; | |
19041 | + } acl_set; | |
19042 | + } u; | |
19043 | +}; | |
f2c43d5f AM |
19044 | +ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, |
19045 | + struct au_sxattr *arg); | |
c1595e42 JR |
19046 | +#endif |
19047 | + | |
4a4d8108 | 19048 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19049 | + |
4a4d8108 AM |
19050 | +/* lock subclass for iinfo */ |
19051 | +enum { | |
19052 | + AuLsc_II_CHILD, /* child first */ | |
19053 | + AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ | |
19054 | + AuLsc_II_CHILD3, /* copyup dirs */ | |
19055 | + AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ | |
19056 | + AuLsc_II_PARENT2, | |
19057 | + AuLsc_II_PARENT3, /* copyup dirs */ | |
19058 | + AuLsc_II_NEW_CHILD | |
19059 | +}; | |
1308ab2a | 19060 | + |
1facf9fc | 19061 | +/* |
4a4d8108 AM |
19062 | + * ii_read_lock_child, ii_write_lock_child, |
19063 | + * ii_read_lock_child2, ii_write_lock_child2, | |
19064 | + * ii_read_lock_child3, ii_write_lock_child3, | |
19065 | + * ii_read_lock_parent, ii_write_lock_parent, | |
19066 | + * ii_read_lock_parent2, ii_write_lock_parent2, | |
19067 | + * ii_read_lock_parent3, ii_write_lock_parent3, | |
19068 | + * ii_read_lock_new_child, ii_write_lock_new_child, | |
1facf9fc | 19069 | + */ |
4a4d8108 AM |
19070 | +#define AuReadLockFunc(name, lsc) \ |
19071 | +static inline void ii_read_lock_##name(struct inode *i) \ | |
19072 | +{ \ | |
19073 | + au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
19074 | +} | |
19075 | + | |
19076 | +#define AuWriteLockFunc(name, lsc) \ | |
19077 | +static inline void ii_write_lock_##name(struct inode *i) \ | |
19078 | +{ \ | |
19079 | + au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
19080 | +} | |
19081 | + | |
19082 | +#define AuRWLockFuncs(name, lsc) \ | |
19083 | + AuReadLockFunc(name, lsc) \ | |
19084 | + AuWriteLockFunc(name, lsc) | |
19085 | + | |
19086 | +AuRWLockFuncs(child, CHILD); | |
19087 | +AuRWLockFuncs(child2, CHILD2); | |
19088 | +AuRWLockFuncs(child3, CHILD3); | |
19089 | +AuRWLockFuncs(parent, PARENT); | |
19090 | +AuRWLockFuncs(parent2, PARENT2); | |
19091 | +AuRWLockFuncs(parent3, PARENT3); | |
19092 | +AuRWLockFuncs(new_child, NEW_CHILD); | |
19093 | + | |
19094 | +#undef AuReadLockFunc | |
19095 | +#undef AuWriteLockFunc | |
19096 | +#undef AuRWLockFuncs | |
1facf9fc | 19097 | + |
8b6a4947 AM |
19098 | +#define ii_read_unlock(i) au_rw_read_unlock(&au_ii(i)->ii_rwsem) |
19099 | +#define ii_write_unlock(i) au_rw_write_unlock(&au_ii(i)->ii_rwsem) | |
19100 | +#define ii_downgrade_lock(i) au_rw_dgrade_lock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 19101 | + |
4a4d8108 AM |
19102 | +#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) |
19103 | +#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) | |
19104 | +#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 19105 | + |
4a4d8108 | 19106 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19107 | + |
027c5e7a AM |
19108 | +static inline void au_icntnr_init(struct au_icntnr *c) |
19109 | +{ | |
19110 | +#ifdef CONFIG_AUFS_DEBUG | |
19111 | + c->vfs_inode.i_mode = 0; | |
19112 | +#endif | |
19113 | +} | |
19114 | + | |
cfc41e69 | 19115 | +static inline unsigned int au_iigen(struct inode *inode, unsigned int *igflags) |
4a4d8108 | 19116 | +{ |
537831f9 AM |
19117 | + unsigned int gen; |
19118 | + struct au_iinfo *iinfo; | |
be52b249 | 19119 | + struct au_iigen *iigen; |
537831f9 AM |
19120 | + |
19121 | + iinfo = au_ii(inode); | |
be52b249 AM |
19122 | + iigen = &iinfo->ii_generation; |
19123 | + spin_lock(&iigen->ig_spin); | |
cfc41e69 AM |
19124 | + if (igflags) |
19125 | + *igflags = iigen->ig_flags; | |
be52b249 AM |
19126 | + gen = iigen->ig_generation; |
19127 | + spin_unlock(&iigen->ig_spin); | |
537831f9 AM |
19128 | + |
19129 | + return gen; | |
4a4d8108 | 19130 | +} |
1308ab2a | 19131 | + |
4a4d8108 AM |
19132 | +/* tiny test for inode number */ |
19133 | +/* tmpfs generation is too rough */ | |
19134 | +static inline int au_test_higen(struct inode *inode, struct inode *h_inode) | |
19135 | +{ | |
19136 | + struct au_iinfo *iinfo; | |
1308ab2a | 19137 | + |
4a4d8108 AM |
19138 | + iinfo = au_ii(inode); |
19139 | + AuRwMustAnyLock(&iinfo->ii_rwsem); | |
19140 | + return !(iinfo->ii_hsb1 == h_inode->i_sb | |
19141 | + && iinfo->ii_higen == h_inode->i_generation); | |
19142 | +} | |
1308ab2a | 19143 | + |
4a4d8108 AM |
19144 | +static inline void au_iigen_dec(struct inode *inode) |
19145 | +{ | |
537831f9 | 19146 | + struct au_iinfo *iinfo; |
be52b249 | 19147 | + struct au_iigen *iigen; |
537831f9 AM |
19148 | + |
19149 | + iinfo = au_ii(inode); | |
be52b249 AM |
19150 | + iigen = &iinfo->ii_generation; |
19151 | + spin_lock(&iigen->ig_spin); | |
19152 | + iigen->ig_generation--; | |
19153 | + spin_unlock(&iigen->ig_spin); | |
027c5e7a AM |
19154 | +} |
19155 | + | |
19156 | +static inline int au_iigen_test(struct inode *inode, unsigned int sigen) | |
19157 | +{ | |
19158 | + int err; | |
19159 | + | |
19160 | + err = 0; | |
537831f9 | 19161 | + if (unlikely(inode && au_iigen(inode, NULL) != sigen)) |
027c5e7a AM |
19162 | + err = -EIO; |
19163 | + | |
19164 | + return err; | |
4a4d8108 | 19165 | +} |
1308ab2a | 19166 | + |
4a4d8108 | 19167 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19168 | + |
5afbbe0d AM |
19169 | +static inline struct au_hinode *au_hinode(struct au_iinfo *iinfo, |
19170 | + aufs_bindex_t bindex) | |
19171 | +{ | |
19172 | + return iinfo->ii_hinode + bindex; | |
19173 | +} | |
19174 | + | |
19175 | +static inline int au_is_bad_inode(struct inode *inode) | |
19176 | +{ | |
19177 | + return !!(is_bad_inode(inode) || !au_hinode(au_ii(inode), 0)); | |
19178 | +} | |
19179 | + | |
4a4d8108 AM |
19180 | +static inline aufs_bindex_t au_ii_br_id(struct inode *inode, |
19181 | + aufs_bindex_t bindex) | |
19182 | +{ | |
19183 | + IiMustAnyLock(inode); | |
5afbbe0d | 19184 | + return au_hinode(au_ii(inode), bindex)->hi_id; |
4a4d8108 | 19185 | +} |
1308ab2a | 19186 | + |
5afbbe0d | 19187 | +static inline aufs_bindex_t au_ibtop(struct inode *inode) |
4a4d8108 AM |
19188 | +{ |
19189 | + IiMustAnyLock(inode); | |
5afbbe0d | 19190 | + return au_ii(inode)->ii_btop; |
4a4d8108 | 19191 | +} |
1308ab2a | 19192 | + |
5afbbe0d | 19193 | +static inline aufs_bindex_t au_ibbot(struct inode *inode) |
4a4d8108 AM |
19194 | +{ |
19195 | + IiMustAnyLock(inode); | |
5afbbe0d | 19196 | + return au_ii(inode)->ii_bbot; |
4a4d8108 | 19197 | +} |
1308ab2a | 19198 | + |
4a4d8108 AM |
19199 | +static inline struct au_vdir *au_ivdir(struct inode *inode) |
19200 | +{ | |
19201 | + IiMustAnyLock(inode); | |
19202 | + return au_ii(inode)->ii_vdir; | |
19203 | +} | |
1308ab2a | 19204 | + |
4a4d8108 AM |
19205 | +static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) |
19206 | +{ | |
19207 | + IiMustAnyLock(inode); | |
5afbbe0d | 19208 | + return au_hinode(au_ii(inode), bindex)->hi_whdentry; |
4a4d8108 | 19209 | +} |
1308ab2a | 19210 | + |
5afbbe0d | 19211 | +static inline void au_set_ibtop(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 19212 | +{ |
4a4d8108 | 19213 | + IiMustWriteLock(inode); |
5afbbe0d | 19214 | + au_ii(inode)->ii_btop = bindex; |
4a4d8108 | 19215 | +} |
1308ab2a | 19216 | + |
5afbbe0d | 19217 | +static inline void au_set_ibbot(struct inode *inode, aufs_bindex_t bindex) |
4a4d8108 AM |
19218 | +{ |
19219 | + IiMustWriteLock(inode); | |
5afbbe0d | 19220 | + au_ii(inode)->ii_bbot = bindex; |
1308ab2a | 19221 | +} |
19222 | + | |
4a4d8108 AM |
19223 | +static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) |
19224 | +{ | |
19225 | + IiMustWriteLock(inode); | |
19226 | + au_ii(inode)->ii_vdir = vdir; | |
19227 | +} | |
1facf9fc | 19228 | + |
4a4d8108 | 19229 | +static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 19230 | +{ |
4a4d8108 | 19231 | + IiMustAnyLock(inode); |
5afbbe0d | 19232 | + return au_hinode(au_ii(inode), bindex); |
4a4d8108 | 19233 | +} |
dece6358 | 19234 | + |
4a4d8108 | 19235 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 19236 | + |
4a4d8108 AM |
19237 | +static inline struct dentry *au_pinned_parent(struct au_pin *pin) |
19238 | +{ | |
19239 | + if (pin) | |
19240 | + return pin->parent; | |
19241 | + return NULL; | |
1facf9fc | 19242 | +} |
19243 | + | |
4a4d8108 | 19244 | +static inline struct inode *au_pinned_h_dir(struct au_pin *pin) |
1facf9fc | 19245 | +{ |
4a4d8108 AM |
19246 | + if (pin && pin->hdir) |
19247 | + return pin->hdir->hi_inode; | |
19248 | + return NULL; | |
1308ab2a | 19249 | +} |
1facf9fc | 19250 | + |
4a4d8108 AM |
19251 | +static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) |
19252 | +{ | |
19253 | + if (pin) | |
19254 | + return pin->hdir; | |
19255 | + return NULL; | |
19256 | +} | |
1facf9fc | 19257 | + |
4a4d8108 | 19258 | +static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) |
1308ab2a | 19259 | +{ |
4a4d8108 AM |
19260 | + if (pin) |
19261 | + pin->dentry = dentry; | |
19262 | +} | |
1308ab2a | 19263 | + |
4a4d8108 AM |
19264 | +static inline void au_pin_set_parent_lflag(struct au_pin *pin, |
19265 | + unsigned char lflag) | |
19266 | +{ | |
19267 | + if (pin) { | |
7f207e10 | 19268 | + if (lflag) |
4a4d8108 | 19269 | + au_fset_pin(pin->flags, DI_LOCKED); |
7f207e10 | 19270 | + else |
4a4d8108 | 19271 | + au_fclr_pin(pin->flags, DI_LOCKED); |
1308ab2a | 19272 | + } |
4a4d8108 AM |
19273 | +} |
19274 | + | |
7e9cd9fe | 19275 | +#if 0 /* reserved */ |
4a4d8108 AM |
19276 | +static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) |
19277 | +{ | |
19278 | + if (pin) { | |
19279 | + dput(pin->parent); | |
19280 | + pin->parent = dget(parent); | |
1facf9fc | 19281 | + } |
4a4d8108 | 19282 | +} |
7e9cd9fe | 19283 | +#endif |
1facf9fc | 19284 | + |
4a4d8108 AM |
19285 | +/* ---------------------------------------------------------------------- */ |
19286 | + | |
027c5e7a | 19287 | +struct au_branch; |
4a4d8108 AM |
19288 | +#ifdef CONFIG_AUFS_HNOTIFY |
19289 | +struct au_hnotify_op { | |
19290 | + void (*ctl)(struct au_hinode *hinode, int do_set); | |
027c5e7a | 19291 | + int (*alloc)(struct au_hinode *hinode); |
7eafdf33 AM |
19292 | + |
19293 | + /* | |
19294 | + * if it returns true, the the caller should free hinode->hi_notify, | |
19295 | + * otherwise ->free() frees it. | |
19296 | + */ | |
19297 | + int (*free)(struct au_hinode *hinode, | |
19298 | + struct au_hnotify *hn) __must_check; | |
4a4d8108 AM |
19299 | + |
19300 | + void (*fin)(void); | |
19301 | + int (*init)(void); | |
027c5e7a AM |
19302 | + |
19303 | + int (*reset_br)(unsigned int udba, struct au_branch *br, int perm); | |
19304 | + void (*fin_br)(struct au_branch *br); | |
19305 | + int (*init_br)(struct au_branch *br, int perm); | |
4a4d8108 AM |
19306 | +}; |
19307 | + | |
19308 | +/* hnotify.c */ | |
027c5e7a | 19309 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode); |
4a4d8108 AM |
19310 | +void au_hn_free(struct au_hinode *hinode); |
19311 | +void au_hn_ctl(struct au_hinode *hinode, int do_set); | |
19312 | +void au_hn_reset(struct inode *inode, unsigned int flags); | |
19313 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
fbc438ed | 19314 | + const struct qstr *h_child_qstr, struct inode *h_child_inode); |
027c5e7a AM |
19315 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm); |
19316 | +int au_hnotify_init_br(struct au_branch *br, int perm); | |
19317 | +void au_hnotify_fin_br(struct au_branch *br); | |
4a4d8108 AM |
19318 | +int __init au_hnotify_init(void); |
19319 | +void au_hnotify_fin(void); | |
19320 | + | |
7f207e10 | 19321 | +/* hfsnotify.c */ |
4a4d8108 AM |
19322 | +extern const struct au_hnotify_op au_hnotify_op; |
19323 | + | |
19324 | +static inline | |
19325 | +void au_hn_init(struct au_hinode *hinode) | |
19326 | +{ | |
19327 | + hinode->hi_notify = NULL; | |
1308ab2a | 19328 | +} |
19329 | + | |
53392da6 AM |
19330 | +static inline struct au_hnotify *au_hn(struct au_hinode *hinode) |
19331 | +{ | |
19332 | + return hinode->hi_notify; | |
19333 | +} | |
19334 | + | |
4a4d8108 | 19335 | +#else |
c1595e42 JR |
19336 | +AuStub(int, au_hn_alloc, return -EOPNOTSUPP, |
19337 | + struct au_hinode *hinode __maybe_unused, | |
19338 | + struct inode *inode __maybe_unused) | |
19339 | +AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode) | |
4a4d8108 AM |
19340 | +AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) |
19341 | +AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, | |
19342 | + int do_set __maybe_unused) | |
19343 | +AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, | |
19344 | + unsigned int flags __maybe_unused) | |
027c5e7a AM |
19345 | +AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused, |
19346 | + struct au_branch *br __maybe_unused, | |
19347 | + int perm __maybe_unused) | |
19348 | +AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused, | |
19349 | + int perm __maybe_unused) | |
19350 | +AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused) | |
4a4d8108 AM |
19351 | +AuStubInt0(__init au_hnotify_init, void) |
19352 | +AuStubVoid(au_hnotify_fin, void) | |
19353 | +AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) | |
19354 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
19355 | + | |
19356 | +static inline void au_hn_suspend(struct au_hinode *hdir) | |
19357 | +{ | |
19358 | + au_hn_ctl(hdir, /*do_set*/0); | |
1308ab2a | 19359 | +} |
19360 | + | |
4a4d8108 | 19361 | +static inline void au_hn_resume(struct au_hinode *hdir) |
1308ab2a | 19362 | +{ |
4a4d8108 AM |
19363 | + au_hn_ctl(hdir, /*do_set*/1); |
19364 | +} | |
1308ab2a | 19365 | + |
5afbbe0d | 19366 | +static inline void au_hn_inode_lock(struct au_hinode *hdir) |
4a4d8108 | 19367 | +{ |
febd17d6 | 19368 | + inode_lock(hdir->hi_inode); |
4a4d8108 AM |
19369 | + au_hn_suspend(hdir); |
19370 | +} | |
dece6358 | 19371 | + |
5afbbe0d | 19372 | +static inline void au_hn_inode_lock_nested(struct au_hinode *hdir, |
4a4d8108 AM |
19373 | + unsigned int sc __maybe_unused) |
19374 | +{ | |
febd17d6 | 19375 | + inode_lock_nested(hdir->hi_inode, sc); |
4a4d8108 | 19376 | + au_hn_suspend(hdir); |
1facf9fc | 19377 | +} |
1facf9fc | 19378 | + |
8b6a4947 AM |
19379 | +#if 0 /* unused */ |
19380 | +#include "vfsub.h" | |
3c1bdaff AM |
19381 | +static inline void au_hn_inode_lock_shared_nested(struct au_hinode *hdir, |
19382 | + unsigned int sc) | |
19383 | +{ | |
be118d29 | 19384 | + inode_lock_shared_nested(hdir->hi_inode, sc); |
3c1bdaff AM |
19385 | + au_hn_suspend(hdir); |
19386 | +} | |
8b6a4947 | 19387 | +#endif |
3c1bdaff | 19388 | + |
5afbbe0d | 19389 | +static inline void au_hn_inode_unlock(struct au_hinode *hdir) |
4a4d8108 AM |
19390 | +{ |
19391 | + au_hn_resume(hdir); | |
febd17d6 | 19392 | + inode_unlock(hdir->hi_inode); |
4a4d8108 AM |
19393 | +} |
19394 | + | |
19395 | +#endif /* __KERNEL__ */ | |
19396 | +#endif /* __AUFS_INODE_H__ */ | |
7f207e10 | 19397 | diff -urN /usr/share/empty/fs/aufs/ioctl.c linux/fs/aufs/ioctl.c |
eca34b5c | 19398 | --- /usr/share/empty/fs/aufs/ioctl.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 19399 | +++ linux/fs/aufs/ioctl.c 2020-01-27 10:57:18.175538316 +0100 |
062440b3 | 19400 | @@ -0,0 +1,220 @@ |
cd7a4cd9 | 19401 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 19402 | +/* |
016522bc | 19403 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
19404 | + * |
19405 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19406 | + * it under the terms of the GNU General Public License as published by | |
19407 | + * the Free Software Foundation; either version 2 of the License, or | |
19408 | + * (at your option) any later version. | |
19409 | + * | |
19410 | + * This program is distributed in the hope that it will be useful, | |
19411 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19412 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19413 | + * GNU General Public License for more details. | |
19414 | + * | |
19415 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 19416 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
19417 | + */ |
19418 | + | |
19419 | +/* | |
19420 | + * ioctl | |
19421 | + * plink-management and readdir in userspace. | |
19422 | + * assist the pathconf(3) wrapper library. | |
c2b27bf2 | 19423 | + * move-down |
076b876e | 19424 | + * File-based Hierarchical Storage Management. |
4a4d8108 AM |
19425 | + */ |
19426 | + | |
c2b27bf2 AM |
19427 | +#include <linux/compat.h> |
19428 | +#include <linux/file.h> | |
4a4d8108 AM |
19429 | +#include "aufs.h" |
19430 | + | |
1e00d052 | 19431 | +static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg) |
4a4d8108 AM |
19432 | +{ |
19433 | + int err, fd; | |
5afbbe0d | 19434 | + aufs_bindex_t wbi, bindex, bbot; |
4a4d8108 AM |
19435 | + struct file *h_file; |
19436 | + struct super_block *sb; | |
19437 | + struct dentry *root; | |
1e00d052 AM |
19438 | + struct au_branch *br; |
19439 | + struct aufs_wbr_fd wbrfd = { | |
19440 | + .oflags = au_dir_roflags, | |
19441 | + .brid = -1 | |
19442 | + }; | |
19443 | + const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY | |
19444 | + | O_NOATIME | O_CLOEXEC; | |
4a4d8108 | 19445 | + |
1e00d052 AM |
19446 | + AuDebugOn(wbrfd.oflags & ~valid); |
19447 | + | |
19448 | + if (arg) { | |
19449 | + err = copy_from_user(&wbrfd, arg, sizeof(wbrfd)); | |
19450 | + if (unlikely(err)) { | |
19451 | + err = -EFAULT; | |
19452 | + goto out; | |
19453 | + } | |
19454 | + | |
19455 | + err = -EINVAL; | |
19456 | + AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid); | |
19457 | + wbrfd.oflags |= au_dir_roflags; | |
19458 | + AuDbg("0%o\n", wbrfd.oflags); | |
19459 | + if (unlikely(wbrfd.oflags & ~valid)) | |
19460 | + goto out; | |
19461 | + } | |
19462 | + | |
2000de60 | 19463 | + fd = get_unused_fd_flags(0); |
1e00d052 AM |
19464 | + err = fd; |
19465 | + if (unlikely(fd < 0)) | |
4a4d8108 | 19466 | + goto out; |
4a4d8108 | 19467 | + |
1e00d052 | 19468 | + h_file = ERR_PTR(-EINVAL); |
4a4d8108 | 19469 | + wbi = 0; |
1e00d052 | 19470 | + br = NULL; |
4a4d8108 AM |
19471 | + sb = path->dentry->d_sb; |
19472 | + root = sb->s_root; | |
19473 | + aufs_read_lock(root, AuLock_IR); | |
5afbbe0d | 19474 | + bbot = au_sbbot(sb); |
1e00d052 AM |
19475 | + if (wbrfd.brid >= 0) { |
19476 | + wbi = au_br_index(sb, wbrfd.brid); | |
5afbbe0d | 19477 | + if (unlikely(wbi < 0 || wbi > bbot)) |
1e00d052 AM |
19478 | + goto out_unlock; |
19479 | + } | |
19480 | + | |
19481 | + h_file = ERR_PTR(-ENOENT); | |
19482 | + br = au_sbr(sb, wbi); | |
19483 | + if (!au_br_writable(br->br_perm)) { | |
19484 | + if (arg) | |
19485 | + goto out_unlock; | |
19486 | + | |
19487 | + bindex = wbi + 1; | |
19488 | + wbi = -1; | |
5afbbe0d | 19489 | + for (; bindex <= bbot; bindex++) { |
1e00d052 AM |
19490 | + br = au_sbr(sb, bindex); |
19491 | + if (au_br_writable(br->br_perm)) { | |
4a4d8108 | 19492 | + wbi = bindex; |
1e00d052 | 19493 | + br = au_sbr(sb, wbi); |
4a4d8108 AM |
19494 | + break; |
19495 | + } | |
19496 | + } | |
4a4d8108 AM |
19497 | + } |
19498 | + AuDbg("wbi %d\n", wbi); | |
1e00d052 | 19499 | + if (wbi >= 0) |
392086de AM |
19500 | + h_file = au_h_open(root, wbi, wbrfd.oflags, NULL, |
19501 | + /*force_wr*/0); | |
1e00d052 AM |
19502 | + |
19503 | +out_unlock: | |
4a4d8108 AM |
19504 | + aufs_read_unlock(root, AuLock_IR); |
19505 | + err = PTR_ERR(h_file); | |
19506 | + if (IS_ERR(h_file)) | |
19507 | + goto out_fd; | |
19508 | + | |
acd2b654 | 19509 | + au_lcnt_dec(&br->br_nfiles); /* cf. au_h_open() */ |
4a4d8108 AM |
19510 | + fd_install(fd, h_file); |
19511 | + err = fd; | |
19512 | + goto out; /* success */ | |
19513 | + | |
4f0767ce | 19514 | +out_fd: |
4a4d8108 | 19515 | + put_unused_fd(fd); |
4f0767ce | 19516 | +out: |
1e00d052 | 19517 | + AuTraceErr(err); |
4a4d8108 AM |
19518 | + return err; |
19519 | +} | |
19520 | + | |
19521 | +/* ---------------------------------------------------------------------- */ | |
19522 | + | |
19523 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) | |
19524 | +{ | |
19525 | + long err; | |
c1595e42 | 19526 | + struct dentry *dentry; |
4a4d8108 AM |
19527 | + |
19528 | + switch (cmd) { | |
4a4d8108 AM |
19529 | + case AUFS_CTL_RDU: |
19530 | + case AUFS_CTL_RDU_INO: | |
19531 | + err = au_rdu_ioctl(file, cmd, arg); | |
19532 | + break; | |
19533 | + | |
19534 | + case AUFS_CTL_WBR_FD: | |
1e00d052 | 19535 | + err = au_wbr_fd(&file->f_path, (void __user *)arg); |
4a4d8108 AM |
19536 | + break; |
19537 | + | |
027c5e7a AM |
19538 | + case AUFS_CTL_IBUSY: |
19539 | + err = au_ibusy_ioctl(file, arg); | |
19540 | + break; | |
19541 | + | |
076b876e AM |
19542 | + case AUFS_CTL_BRINFO: |
19543 | + err = au_brinfo_ioctl(file, arg); | |
19544 | + break; | |
19545 | + | |
19546 | + case AUFS_CTL_FHSM_FD: | |
2000de60 | 19547 | + dentry = file->f_path.dentry; |
c1595e42 JR |
19548 | + if (IS_ROOT(dentry)) |
19549 | + err = au_fhsm_fd(dentry->d_sb, arg); | |
19550 | + else | |
19551 | + err = -ENOTTY; | |
076b876e AM |
19552 | + break; |
19553 | + | |
4a4d8108 AM |
19554 | + default: |
19555 | + /* do not call the lower */ | |
19556 | + AuDbg("0x%x\n", cmd); | |
19557 | + err = -ENOTTY; | |
19558 | + } | |
19559 | + | |
19560 | + AuTraceErr(err); | |
19561 | + return err; | |
19562 | +} | |
19563 | + | |
19564 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) | |
19565 | +{ | |
19566 | + long err; | |
19567 | + | |
19568 | + switch (cmd) { | |
c2b27bf2 | 19569 | + case AUFS_CTL_MVDOWN: |
2000de60 | 19570 | + err = au_mvdown(file->f_path.dentry, (void __user *)arg); |
c2b27bf2 AM |
19571 | + break; |
19572 | + | |
4a4d8108 | 19573 | + case AUFS_CTL_WBR_FD: |
1e00d052 | 19574 | + err = au_wbr_fd(&file->f_path, (void __user *)arg); |
4a4d8108 AM |
19575 | + break; |
19576 | + | |
19577 | + default: | |
19578 | + /* do not call the lower */ | |
19579 | + AuDbg("0x%x\n", cmd); | |
19580 | + err = -ENOTTY; | |
19581 | + } | |
19582 | + | |
19583 | + AuTraceErr(err); | |
19584 | + return err; | |
19585 | +} | |
b752ccd1 AM |
19586 | + |
19587 | +#ifdef CONFIG_COMPAT | |
19588 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
19589 | + unsigned long arg) | |
19590 | +{ | |
19591 | + long err; | |
19592 | + | |
19593 | + switch (cmd) { | |
19594 | + case AUFS_CTL_RDU: | |
19595 | + case AUFS_CTL_RDU_INO: | |
19596 | + err = au_rdu_compat_ioctl(file, cmd, arg); | |
19597 | + break; | |
19598 | + | |
027c5e7a AM |
19599 | + case AUFS_CTL_IBUSY: |
19600 | + err = au_ibusy_compat_ioctl(file, arg); | |
19601 | + break; | |
19602 | + | |
076b876e AM |
19603 | + case AUFS_CTL_BRINFO: |
19604 | + err = au_brinfo_compat_ioctl(file, arg); | |
19605 | + break; | |
19606 | + | |
b752ccd1 AM |
19607 | + default: |
19608 | + err = aufs_ioctl_dir(file, cmd, arg); | |
19609 | + } | |
19610 | + | |
19611 | + AuTraceErr(err); | |
19612 | + return err; | |
19613 | +} | |
19614 | + | |
b752ccd1 AM |
19615 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, |
19616 | + unsigned long arg) | |
19617 | +{ | |
19618 | + return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); | |
19619 | +} | |
19620 | +#endif | |
7f207e10 | 19621 | diff -urN /usr/share/empty/fs/aufs/i_op_add.c linux/fs/aufs/i_op_add.c |
eca34b5c | 19622 | --- /usr/share/empty/fs/aufs/i_op_add.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 19623 | +++ linux/fs/aufs/i_op_add.c 2020-01-27 10:57:18.172204883 +0100 |
eca801bf | 19624 | @@ -0,0 +1,936 @@ |
cd7a4cd9 | 19625 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 19626 | +/* |
016522bc | 19627 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
19628 | + * |
19629 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19630 | + * it under the terms of the GNU General Public License as published by | |
19631 | + * the Free Software Foundation; either version 2 of the License, or | |
19632 | + * (at your option) any later version. | |
19633 | + * | |
19634 | + * This program is distributed in the hope that it will be useful, | |
19635 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19636 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19637 | + * GNU General Public License for more details. | |
19638 | + * | |
19639 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 19640 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
19641 | + */ |
19642 | + | |
19643 | +/* | |
19644 | + * inode operations (add entry) | |
19645 | + */ | |
19646 | + | |
eca801bf | 19647 | +#include <linux/iversion.h> |
4a4d8108 AM |
19648 | +#include "aufs.h" |
19649 | + | |
19650 | +/* | |
19651 | + * final procedure of adding a new entry, except link(2). | |
19652 | + * remove whiteout, instantiate, copyup the parent dir's times and size | |
19653 | + * and update version. | |
19654 | + * if it failed, re-create the removed whiteout. | |
19655 | + */ | |
19656 | +static int epilog(struct inode *dir, aufs_bindex_t bindex, | |
19657 | + struct dentry *wh_dentry, struct dentry *dentry) | |
19658 | +{ | |
19659 | + int err, rerr; | |
19660 | + aufs_bindex_t bwh; | |
19661 | + struct path h_path; | |
076b876e | 19662 | + struct super_block *sb; |
4a4d8108 AM |
19663 | + struct inode *inode, *h_dir; |
19664 | + struct dentry *wh; | |
19665 | + | |
19666 | + bwh = -1; | |
076b876e | 19667 | + sb = dir->i_sb; |
4a4d8108 | 19668 | + if (wh_dentry) { |
5527c038 | 19669 | + h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ |
4a4d8108 AM |
19670 | + IMustLock(h_dir); |
19671 | + AuDebugOn(au_h_iptr(dir, bindex) != h_dir); | |
19672 | + bwh = au_dbwh(dentry); | |
19673 | + h_path.dentry = wh_dentry; | |
076b876e | 19674 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
4a4d8108 AM |
19675 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, |
19676 | + dentry); | |
19677 | + if (unlikely(err)) | |
19678 | + goto out; | |
19679 | + } | |
19680 | + | |
19681 | + inode = au_new_inode(dentry, /*must_new*/1); | |
19682 | + if (!IS_ERR(inode)) { | |
19683 | + d_instantiate(dentry, inode); | |
5527c038 | 19684 | + dir = d_inode(dentry->d_parent); /* dir inode is locked */ |
4a4d8108 | 19685 | + IMustLock(dir); |
b912730e | 19686 | + au_dir_ts(dir, bindex); |
be118d29 | 19687 | + inode_inc_iversion(dir); |
076b876e | 19688 | + au_fhsm_wrote(sb, bindex, /*force*/0); |
4a4d8108 AM |
19689 | + return 0; /* success */ |
19690 | + } | |
19691 | + | |
19692 | + err = PTR_ERR(inode); | |
19693 | + if (!wh_dentry) | |
19694 | + goto out; | |
19695 | + | |
19696 | + /* revert */ | |
19697 | + /* dir inode is locked */ | |
19698 | + wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); | |
19699 | + rerr = PTR_ERR(wh); | |
19700 | + if (IS_ERR(wh)) { | |
523b37e3 AM |
19701 | + AuIOErr("%pd reverting whiteout failed(%d, %d)\n", |
19702 | + dentry, err, rerr); | |
4a4d8108 AM |
19703 | + err = -EIO; |
19704 | + } else | |
19705 | + dput(wh); | |
19706 | + | |
4f0767ce | 19707 | +out: |
4a4d8108 AM |
19708 | + return err; |
19709 | +} | |
19710 | + | |
027c5e7a AM |
19711 | +static int au_d_may_add(struct dentry *dentry) |
19712 | +{ | |
19713 | + int err; | |
19714 | + | |
19715 | + err = 0; | |
19716 | + if (unlikely(d_unhashed(dentry))) | |
19717 | + err = -ENOENT; | |
5527c038 | 19718 | + if (unlikely(d_really_is_positive(dentry))) |
027c5e7a AM |
19719 | + err = -EEXIST; |
19720 | + return err; | |
19721 | +} | |
19722 | + | |
4a4d8108 AM |
19723 | +/* |
19724 | + * simple tests for the adding inode operations. | |
19725 | + * following the checks in vfs, plus the parent-child relationship. | |
19726 | + */ | |
19727 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
19728 | + struct dentry *h_parent, int isdir) | |
19729 | +{ | |
19730 | + int err; | |
19731 | + umode_t h_mode; | |
19732 | + struct dentry *h_dentry; | |
19733 | + struct inode *h_inode; | |
19734 | + | |
19735 | + err = -ENAMETOOLONG; | |
19736 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
19737 | + goto out; | |
19738 | + | |
19739 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 19740 | + if (d_really_is_negative(dentry)) { |
4a4d8108 | 19741 | + err = -EEXIST; |
5527c038 | 19742 | + if (unlikely(d_is_positive(h_dentry))) |
4a4d8108 AM |
19743 | + goto out; |
19744 | + } else { | |
19745 | + /* rename(2) case */ | |
19746 | + err = -EIO; | |
5527c038 JR |
19747 | + if (unlikely(d_is_negative(h_dentry))) |
19748 | + goto out; | |
19749 | + h_inode = d_inode(h_dentry); | |
19750 | + if (unlikely(!h_inode->i_nlink)) | |
4a4d8108 AM |
19751 | + goto out; |
19752 | + | |
19753 | + h_mode = h_inode->i_mode; | |
19754 | + if (!isdir) { | |
19755 | + err = -EISDIR; | |
19756 | + if (unlikely(S_ISDIR(h_mode))) | |
19757 | + goto out; | |
19758 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
19759 | + err = -ENOTDIR; | |
19760 | + goto out; | |
19761 | + } | |
19762 | + } | |
19763 | + | |
19764 | + err = 0; | |
19765 | + /* expected parent dir is locked */ | |
19766 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
19767 | + err = -EIO; | |
19768 | + | |
4f0767ce | 19769 | +out: |
4a4d8108 AM |
19770 | + AuTraceErr(err); |
19771 | + return err; | |
19772 | +} | |
19773 | + | |
19774 | +/* | |
19775 | + * initial procedure of adding a new entry. | |
19776 | + * prepare writable branch and the parent dir, lock it, | |
19777 | + * and lookup whiteout for the new entry. | |
19778 | + */ | |
19779 | +static struct dentry* | |
19780 | +lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, | |
19781 | + struct dentry *src_dentry, struct au_pin *pin, | |
19782 | + struct au_wr_dir_args *wr_dir_args) | |
19783 | +{ | |
19784 | + struct dentry *wh_dentry, *h_parent; | |
19785 | + struct super_block *sb; | |
19786 | + struct au_branch *br; | |
19787 | + int err; | |
19788 | + unsigned int udba; | |
19789 | + aufs_bindex_t bcpup; | |
19790 | + | |
523b37e3 | 19791 | + AuDbg("%pd\n", dentry); |
4a4d8108 AM |
19792 | + |
19793 | + err = au_wr_dir(dentry, src_dentry, wr_dir_args); | |
19794 | + bcpup = err; | |
19795 | + wh_dentry = ERR_PTR(err); | |
19796 | + if (unlikely(err < 0)) | |
19797 | + goto out; | |
19798 | + | |
19799 | + sb = dentry->d_sb; | |
19800 | + udba = au_opt_udba(sb); | |
19801 | + err = au_pin(pin, dentry, bcpup, udba, | |
19802 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
19803 | + wh_dentry = ERR_PTR(err); | |
19804 | + if (unlikely(err)) | |
19805 | + goto out; | |
19806 | + | |
19807 | + h_parent = au_pinned_h_parent(pin); | |
19808 | + if (udba != AuOpt_UDBA_NONE | |
5afbbe0d | 19809 | + && au_dbtop(dentry) == bcpup) |
4a4d8108 AM |
19810 | + err = au_may_add(dentry, bcpup, h_parent, |
19811 | + au_ftest_wrdir(wr_dir_args->flags, ISDIR)); | |
19812 | + else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
19813 | + err = -ENAMETOOLONG; | |
19814 | + wh_dentry = ERR_PTR(err); | |
19815 | + if (unlikely(err)) | |
19816 | + goto out_unpin; | |
19817 | + | |
19818 | + br = au_sbr(sb, bcpup); | |
19819 | + if (dt) { | |
19820 | + struct path tmp = { | |
19821 | + .dentry = h_parent, | |
86dc4139 | 19822 | + .mnt = au_br_mnt(br) |
4a4d8108 AM |
19823 | + }; |
19824 | + au_dtime_store(dt, au_pinned_parent(pin), &tmp); | |
19825 | + } | |
19826 | + | |
19827 | + wh_dentry = NULL; | |
19828 | + if (bcpup != au_dbwh(dentry)) | |
19829 | + goto out; /* success */ | |
19830 | + | |
2000de60 JR |
19831 | + /* |
19832 | + * ENAMETOOLONG here means that if we allowed create such name, then it | |
19833 | + * would not be able to removed in the future. So we don't allow such | |
19834 | + * name here and we don't handle ENAMETOOLONG differently here. | |
19835 | + */ | |
4a4d8108 AM |
19836 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); |
19837 | + | |
4f0767ce | 19838 | +out_unpin: |
4a4d8108 AM |
19839 | + if (IS_ERR(wh_dentry)) |
19840 | + au_unpin(pin); | |
4f0767ce | 19841 | +out: |
4a4d8108 AM |
19842 | + return wh_dentry; |
19843 | +} | |
19844 | + | |
19845 | +/* ---------------------------------------------------------------------- */ | |
19846 | + | |
19847 | +enum { Mknod, Symlink, Creat }; | |
19848 | +struct simple_arg { | |
19849 | + int type; | |
19850 | + union { | |
19851 | + struct { | |
b912730e AM |
19852 | + umode_t mode; |
19853 | + bool want_excl; | |
19854 | + bool try_aopen; | |
19855 | + struct vfsub_aopen_args *aopen; | |
4a4d8108 AM |
19856 | + } c; |
19857 | + struct { | |
19858 | + const char *symname; | |
19859 | + } s; | |
19860 | + struct { | |
7eafdf33 | 19861 | + umode_t mode; |
4a4d8108 AM |
19862 | + dev_t dev; |
19863 | + } m; | |
19864 | + } u; | |
19865 | +}; | |
19866 | + | |
19867 | +static int add_simple(struct inode *dir, struct dentry *dentry, | |
19868 | + struct simple_arg *arg) | |
19869 | +{ | |
076b876e | 19870 | + int err, rerr; |
5afbbe0d | 19871 | + aufs_bindex_t btop; |
4a4d8108 | 19872 | + unsigned char created; |
b912730e AM |
19873 | + const unsigned char try_aopen |
19874 | + = (arg->type == Creat && arg->u.c.try_aopen); | |
acd2b654 | 19875 | + struct vfsub_aopen_args *aopen = arg->u.c.aopen; |
4a4d8108 AM |
19876 | + struct dentry *wh_dentry, *parent; |
19877 | + struct inode *h_dir; | |
b912730e AM |
19878 | + struct super_block *sb; |
19879 | + struct au_branch *br; | |
acd2b654 | 19880 | + /* to reduce stack size */ |
c2b27bf2 AM |
19881 | + struct { |
19882 | + struct au_dtime dt; | |
19883 | + struct au_pin pin; | |
19884 | + struct path h_path; | |
19885 | + struct au_wr_dir_args wr_dir_args; | |
19886 | + } *a; | |
4a4d8108 | 19887 | + |
523b37e3 | 19888 | + AuDbg("%pd\n", dentry); |
4a4d8108 AM |
19889 | + IMustLock(dir); |
19890 | + | |
c2b27bf2 AM |
19891 | + err = -ENOMEM; |
19892 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
19893 | + if (unlikely(!a)) | |
19894 | + goto out; | |
19895 | + a->wr_dir_args.force_btgt = -1; | |
19896 | + a->wr_dir_args.flags = AuWrDir_ADD_ENTRY; | |
19897 | + | |
4a4d8108 | 19898 | + parent = dentry->d_parent; /* dir inode is locked */ |
b912730e AM |
19899 | + if (!try_aopen) { |
19900 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); | |
19901 | + if (unlikely(err)) | |
19902 | + goto out_free; | |
19903 | + } | |
027c5e7a AM |
19904 | + err = au_d_may_add(dentry); |
19905 | + if (unlikely(err)) | |
19906 | + goto out_unlock; | |
b912730e AM |
19907 | + if (!try_aopen) |
19908 | + di_write_lock_parent(parent); | |
c2b27bf2 AM |
19909 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, |
19910 | + &a->pin, &a->wr_dir_args); | |
4a4d8108 AM |
19911 | + err = PTR_ERR(wh_dentry); |
19912 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 19913 | + goto out_parent; |
4a4d8108 | 19914 | + |
5afbbe0d | 19915 | + btop = au_dbtop(dentry); |
b912730e | 19916 | + sb = dentry->d_sb; |
5afbbe0d AM |
19917 | + br = au_sbr(sb, btop); |
19918 | + a->h_path.dentry = au_h_dptr(dentry, btop); | |
b912730e | 19919 | + a->h_path.mnt = au_br_mnt(br); |
c2b27bf2 | 19920 | + h_dir = au_pinned_h_dir(&a->pin); |
4a4d8108 AM |
19921 | + switch (arg->type) { |
19922 | + case Creat: | |
acd2b654 | 19923 | + if (!try_aopen || !h_dir->i_op->atomic_open) { |
b912730e AM |
19924 | + err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode, |
19925 | + arg->u.c.want_excl); | |
acd2b654 AM |
19926 | + created = !err; |
19927 | + if (!err && try_aopen) | |
19928 | + aopen->file->f_mode |= FMODE_CREATED; | |
19929 | + } else { | |
19930 | + aopen->br = br; | |
19931 | + err = vfsub_atomic_open(h_dir, a->h_path.dentry, aopen); | |
19932 | + AuDbg("err %d\n", err); | |
19933 | + AuDbgFile(aopen->file); | |
19934 | + created = err >= 0 | |
19935 | + && !!(aopen->file->f_mode & FMODE_CREATED); | |
19936 | + } | |
4a4d8108 AM |
19937 | + break; |
19938 | + case Symlink: | |
c2b27bf2 | 19939 | + err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname); |
acd2b654 | 19940 | + created = !err; |
4a4d8108 AM |
19941 | + break; |
19942 | + case Mknod: | |
c2b27bf2 AM |
19943 | + err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode, |
19944 | + arg->u.m.dev); | |
acd2b654 | 19945 | + created = !err; |
4a4d8108 AM |
19946 | + break; |
19947 | + default: | |
19948 | + BUG(); | |
19949 | + } | |
acd2b654 AM |
19950 | + if (unlikely(err < 0)) |
19951 | + goto out_unpin; | |
19952 | + | |
19953 | + err = epilog(dir, btop, wh_dentry, dentry); | |
4a4d8108 | 19954 | + if (!err) |
acd2b654 | 19955 | + goto out_unpin; /* success */ |
4a4d8108 AM |
19956 | + |
19957 | + /* revert */ | |
acd2b654 | 19958 | + if (created /* && d_is_positive(a->h_path.dentry) */) { |
523b37e3 AM |
19959 | + /* no delegation since it is just created */ |
19960 | + rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL, | |
19961 | + /*force*/0); | |
4a4d8108 | 19962 | + if (rerr) { |
523b37e3 AM |
19963 | + AuIOErr("%pd revert failure(%d, %d)\n", |
19964 | + dentry, err, rerr); | |
4a4d8108 AM |
19965 | + err = -EIO; |
19966 | + } | |
c2b27bf2 | 19967 | + au_dtime_revert(&a->dt); |
4a4d8108 | 19968 | + } |
acd2b654 AM |
19969 | + if (try_aopen && h_dir->i_op->atomic_open |
19970 | + && (aopen->file->f_mode & FMODE_OPENED)) | |
19971 | + /* aopen->file is still opened */ | |
19972 | + au_lcnt_dec(&aopen->br->br_nfiles); | |
4a4d8108 | 19973 | + |
acd2b654 | 19974 | +out_unpin: |
c2b27bf2 | 19975 | + au_unpin(&a->pin); |
4a4d8108 | 19976 | + dput(wh_dentry); |
027c5e7a | 19977 | +out_parent: |
b912730e AM |
19978 | + if (!try_aopen) |
19979 | + di_write_unlock(parent); | |
027c5e7a | 19980 | +out_unlock: |
4a4d8108 | 19981 | + if (unlikely(err)) { |
5afbbe0d | 19982 | + au_update_dbtop(dentry); |
4a4d8108 AM |
19983 | + d_drop(dentry); |
19984 | + } | |
b912730e AM |
19985 | + if (!try_aopen) |
19986 | + aufs_read_unlock(dentry, AuLock_DW); | |
c2b27bf2 | 19987 | +out_free: |
9f237c51 | 19988 | + au_kfree_rcu(a); |
027c5e7a | 19989 | +out: |
4a4d8108 AM |
19990 | + return err; |
19991 | +} | |
19992 | + | |
7eafdf33 AM |
19993 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
19994 | + dev_t dev) | |
4a4d8108 AM |
19995 | +{ |
19996 | + struct simple_arg arg = { | |
19997 | + .type = Mknod, | |
19998 | + .u.m = { | |
19999 | + .mode = mode, | |
20000 | + .dev = dev | |
20001 | + } | |
20002 | + }; | |
20003 | + return add_simple(dir, dentry, &arg); | |
20004 | +} | |
20005 | + | |
20006 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
20007 | +{ | |
20008 | + struct simple_arg arg = { | |
20009 | + .type = Symlink, | |
20010 | + .u.s.symname = symname | |
20011 | + }; | |
20012 | + return add_simple(dir, dentry, &arg); | |
20013 | +} | |
20014 | + | |
7eafdf33 | 20015 | +int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
b4510431 | 20016 | + bool want_excl) |
4a4d8108 AM |
20017 | +{ |
20018 | + struct simple_arg arg = { | |
20019 | + .type = Creat, | |
20020 | + .u.c = { | |
b4510431 AM |
20021 | + .mode = mode, |
20022 | + .want_excl = want_excl | |
4a4d8108 AM |
20023 | + } |
20024 | + }; | |
20025 | + return add_simple(dir, dentry, &arg); | |
20026 | +} | |
20027 | + | |
b912730e AM |
20028 | +int au_aopen_or_create(struct inode *dir, struct dentry *dentry, |
20029 | + struct vfsub_aopen_args *aopen_args) | |
20030 | +{ | |
20031 | + struct simple_arg arg = { | |
20032 | + .type = Creat, | |
20033 | + .u.c = { | |
20034 | + .mode = aopen_args->create_mode, | |
20035 | + .want_excl = aopen_args->open_flag & O_EXCL, | |
20036 | + .try_aopen = true, | |
20037 | + .aopen = aopen_args | |
20038 | + } | |
20039 | + }; | |
20040 | + return add_simple(dir, dentry, &arg); | |
20041 | +} | |
20042 | + | |
38d290e6 JR |
20043 | +int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
20044 | +{ | |
20045 | + int err; | |
20046 | + aufs_bindex_t bindex; | |
20047 | + struct super_block *sb; | |
20048 | + struct dentry *parent, *h_parent, *h_dentry; | |
20049 | + struct inode *h_dir, *inode; | |
20050 | + struct vfsmount *h_mnt; | |
20051 | + struct au_wr_dir_args wr_dir_args = { | |
20052 | + .force_btgt = -1, | |
20053 | + .flags = AuWrDir_TMPFILE | |
20054 | + }; | |
20055 | + | |
20056 | + /* copy-up may happen */ | |
febd17d6 | 20057 | + inode_lock(dir); |
38d290e6 JR |
20058 | + |
20059 | + sb = dir->i_sb; | |
20060 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
20061 | + if (unlikely(err)) | |
20062 | + goto out; | |
20063 | + | |
20064 | + err = au_di_init(dentry); | |
20065 | + if (unlikely(err)) | |
20066 | + goto out_si; | |
20067 | + | |
20068 | + err = -EBUSY; | |
20069 | + parent = d_find_any_alias(dir); | |
20070 | + AuDebugOn(!parent); | |
20071 | + di_write_lock_parent(parent); | |
5527c038 | 20072 | + if (unlikely(d_inode(parent) != dir)) |
38d290e6 JR |
20073 | + goto out_parent; |
20074 | + | |
20075 | + err = au_digen_test(parent, au_sigen(sb)); | |
20076 | + if (unlikely(err)) | |
20077 | + goto out_parent; | |
20078 | + | |
5afbbe0d AM |
20079 | + bindex = au_dbtop(parent); |
20080 | + au_set_dbtop(dentry, bindex); | |
20081 | + au_set_dbbot(dentry, bindex); | |
38d290e6 JR |
20082 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
20083 | + bindex = err; | |
20084 | + if (unlikely(err < 0)) | |
20085 | + goto out_parent; | |
20086 | + | |
20087 | + err = -EOPNOTSUPP; | |
20088 | + h_dir = au_h_iptr(dir, bindex); | |
20089 | + if (unlikely(!h_dir->i_op->tmpfile)) | |
20090 | + goto out_parent; | |
20091 | + | |
20092 | + h_mnt = au_sbr_mnt(sb, bindex); | |
20093 | + err = vfsub_mnt_want_write(h_mnt); | |
20094 | + if (unlikely(err)) | |
20095 | + goto out_parent; | |
20096 | + | |
20097 | + h_parent = au_h_dptr(parent, bindex); | |
521ced18 JR |
20098 | + h_dentry = vfs_tmpfile(h_parent, mode, /*open_flag*/0); |
20099 | + if (IS_ERR(h_dentry)) { | |
20100 | + err = PTR_ERR(h_dentry); | |
38d290e6 | 20101 | + goto out_mnt; |
521ced18 | 20102 | + } |
38d290e6 | 20103 | + |
5afbbe0d AM |
20104 | + au_set_dbtop(dentry, bindex); |
20105 | + au_set_dbbot(dentry, bindex); | |
38d290e6 JR |
20106 | + au_set_h_dptr(dentry, bindex, dget(h_dentry)); |
20107 | + inode = au_new_inode(dentry, /*must_new*/1); | |
20108 | + if (IS_ERR(inode)) { | |
20109 | + err = PTR_ERR(inode); | |
20110 | + au_set_h_dptr(dentry, bindex, NULL); | |
5afbbe0d AM |
20111 | + au_set_dbtop(dentry, -1); |
20112 | + au_set_dbbot(dentry, -1); | |
38d290e6 JR |
20113 | + } else { |
20114 | + if (!inode->i_nlink) | |
20115 | + set_nlink(inode, 1); | |
20116 | + d_tmpfile(dentry, inode); | |
20117 | + au_di(dentry)->di_tmpfile = 1; | |
20118 | + | |
20119 | + /* update without i_mutex */ | |
5afbbe0d | 20120 | + if (au_ibtop(dir) == au_dbtop(dentry)) |
38d290e6 JR |
20121 | + au_cpup_attr_timesizes(dir); |
20122 | + } | |
38d290e6 | 20123 | + dput(h_dentry); |
521ced18 | 20124 | + |
38d290e6 JR |
20125 | +out_mnt: |
20126 | + vfsub_mnt_drop_write(h_mnt); | |
20127 | +out_parent: | |
20128 | + di_write_unlock(parent); | |
20129 | + dput(parent); | |
20130 | + di_write_unlock(dentry); | |
5afbbe0d | 20131 | + if (unlikely(err)) { |
38d290e6 JR |
20132 | + au_di_fin(dentry); |
20133 | + dentry->d_fsdata = NULL; | |
20134 | + } | |
20135 | +out_si: | |
20136 | + si_read_unlock(sb); | |
20137 | +out: | |
febd17d6 | 20138 | + inode_unlock(dir); |
38d290e6 JR |
20139 | + return err; |
20140 | +} | |
20141 | + | |
4a4d8108 AM |
20142 | +/* ---------------------------------------------------------------------- */ |
20143 | + | |
20144 | +struct au_link_args { | |
20145 | + aufs_bindex_t bdst, bsrc; | |
20146 | + struct au_pin pin; | |
20147 | + struct path h_path; | |
20148 | + struct dentry *src_parent, *parent; | |
20149 | +}; | |
20150 | + | |
20151 | +static int au_cpup_before_link(struct dentry *src_dentry, | |
20152 | + struct au_link_args *a) | |
20153 | +{ | |
20154 | + int err; | |
20155 | + struct dentry *h_src_dentry; | |
c2b27bf2 AM |
20156 | + struct au_cp_generic cpg = { |
20157 | + .dentry = src_dentry, | |
20158 | + .bdst = a->bdst, | |
20159 | + .bsrc = a->bsrc, | |
20160 | + .len = -1, | |
20161 | + .pin = &a->pin, | |
20162 | + .flags = AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */ | |
20163 | + }; | |
4a4d8108 AM |
20164 | + |
20165 | + di_read_lock_parent(a->src_parent, AuLock_IR); | |
20166 | + err = au_test_and_cpup_dirs(src_dentry, a->bdst); | |
20167 | + if (unlikely(err)) | |
20168 | + goto out; | |
20169 | + | |
20170 | + h_src_dentry = au_h_dptr(src_dentry, a->bsrc); | |
4a4d8108 AM |
20171 | + err = au_pin(&a->pin, src_dentry, a->bdst, |
20172 | + au_opt_udba(src_dentry->d_sb), | |
20173 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
20174 | + if (unlikely(err)) | |
20175 | + goto out; | |
367653fa | 20176 | + |
c2b27bf2 | 20177 | + err = au_sio_cpup_simple(&cpg); |
4a4d8108 AM |
20178 | + au_unpin(&a->pin); |
20179 | + | |
4f0767ce | 20180 | +out: |
4a4d8108 AM |
20181 | + di_read_unlock(a->src_parent, AuLock_IR); |
20182 | + return err; | |
20183 | +} | |
20184 | + | |
86dc4139 AM |
20185 | +static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry, |
20186 | + struct au_link_args *a) | |
4a4d8108 AM |
20187 | +{ |
20188 | + int err; | |
20189 | + unsigned char plink; | |
5afbbe0d | 20190 | + aufs_bindex_t bbot; |
4a4d8108 | 20191 | + struct dentry *h_src_dentry; |
523b37e3 | 20192 | + struct inode *h_inode, *inode, *delegated; |
4a4d8108 AM |
20193 | + struct super_block *sb; |
20194 | + struct file *h_file; | |
20195 | + | |
20196 | + plink = 0; | |
20197 | + h_inode = NULL; | |
20198 | + sb = src_dentry->d_sb; | |
5527c038 | 20199 | + inode = d_inode(src_dentry); |
5afbbe0d | 20200 | + if (au_ibtop(inode) <= a->bdst) |
4a4d8108 AM |
20201 | + h_inode = au_h_iptr(inode, a->bdst); |
20202 | + if (!h_inode || !h_inode->i_nlink) { | |
20203 | + /* copyup src_dentry as the name of dentry. */ | |
5afbbe0d AM |
20204 | + bbot = au_dbbot(dentry); |
20205 | + if (bbot < a->bsrc) | |
20206 | + au_set_dbbot(dentry, a->bsrc); | |
86dc4139 AM |
20207 | + au_set_h_dptr(dentry, a->bsrc, |
20208 | + dget(au_h_dptr(src_dentry, a->bsrc))); | |
20209 | + dget(a->h_path.dentry); | |
20210 | + au_set_h_dptr(dentry, a->bdst, NULL); | |
c1595e42 JR |
20211 | + AuDbg("temporary d_inode...\n"); |
20212 | + spin_lock(&dentry->d_lock); | |
5527c038 | 20213 | + dentry->d_inode = d_inode(src_dentry); /* tmp */ |
c1595e42 | 20214 | + spin_unlock(&dentry->d_lock); |
392086de | 20215 | + h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0); |
86dc4139 | 20216 | + if (IS_ERR(h_file)) |
4a4d8108 | 20217 | + err = PTR_ERR(h_file); |
86dc4139 | 20218 | + else { |
c2b27bf2 AM |
20219 | + struct au_cp_generic cpg = { |
20220 | + .dentry = dentry, | |
20221 | + .bdst = a->bdst, | |
20222 | + .bsrc = -1, | |
20223 | + .len = -1, | |
20224 | + .pin = &a->pin, | |
20225 | + .flags = AuCpup_KEEPLINO | |
20226 | + }; | |
20227 | + err = au_sio_cpup_simple(&cpg); | |
86dc4139 AM |
20228 | + au_h_open_post(dentry, a->bsrc, h_file); |
20229 | + if (!err) { | |
20230 | + dput(a->h_path.dentry); | |
20231 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); | |
20232 | + } else | |
20233 | + au_set_h_dptr(dentry, a->bdst, | |
20234 | + a->h_path.dentry); | |
20235 | + } | |
c1595e42 | 20236 | + spin_lock(&dentry->d_lock); |
86dc4139 | 20237 | + dentry->d_inode = NULL; /* restore */ |
c1595e42 JR |
20238 | + spin_unlock(&dentry->d_lock); |
20239 | + AuDbg("temporary d_inode...done\n"); | |
86dc4139 | 20240 | + au_set_h_dptr(dentry, a->bsrc, NULL); |
5afbbe0d | 20241 | + au_set_dbbot(dentry, bbot); |
4a4d8108 AM |
20242 | + } else { |
20243 | + /* the inode of src_dentry already exists on a.bdst branch */ | |
20244 | + h_src_dentry = d_find_alias(h_inode); | |
20245 | + if (!h_src_dentry && au_plink_test(inode)) { | |
20246 | + plink = 1; | |
20247 | + h_src_dentry = au_plink_lkup(inode, a->bdst); | |
20248 | + err = PTR_ERR(h_src_dentry); | |
20249 | + if (IS_ERR(h_src_dentry)) | |
20250 | + goto out; | |
20251 | + | |
5527c038 | 20252 | + if (unlikely(d_is_negative(h_src_dentry))) { |
4a4d8108 AM |
20253 | + dput(h_src_dentry); |
20254 | + h_src_dentry = NULL; | |
20255 | + } | |
20256 | + | |
20257 | + } | |
20258 | + if (h_src_dentry) { | |
523b37e3 | 20259 | + delegated = NULL; |
4a4d8108 | 20260 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), |
523b37e3 AM |
20261 | + &a->h_path, &delegated); |
20262 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20263 | + pr_warn("cannot retry for NFSv4 delegation" | |
20264 | + " for an internal link\n"); | |
20265 | + iput(delegated); | |
20266 | + } | |
4a4d8108 AM |
20267 | + dput(h_src_dentry); |
20268 | + } else { | |
20269 | + AuIOErr("no dentry found for hi%lu on b%d\n", | |
20270 | + h_inode->i_ino, a->bdst); | |
20271 | + err = -EIO; | |
20272 | + } | |
20273 | + } | |
20274 | + | |
20275 | + if (!err && !plink) | |
20276 | + au_plink_append(inode, a->bdst, a->h_path.dentry); | |
20277 | + | |
20278 | +out: | |
2cbb1c4b | 20279 | + AuTraceErr(err); |
4a4d8108 AM |
20280 | + return err; |
20281 | +} | |
20282 | + | |
20283 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
20284 | + struct dentry *dentry) | |
20285 | +{ | |
20286 | + int err, rerr; | |
20287 | + struct au_dtime dt; | |
20288 | + struct au_link_args *a; | |
20289 | + struct dentry *wh_dentry, *h_src_dentry; | |
523b37e3 | 20290 | + struct inode *inode, *delegated; |
4a4d8108 AM |
20291 | + struct super_block *sb; |
20292 | + struct au_wr_dir_args wr_dir_args = { | |
20293 | + /* .force_btgt = -1, */ | |
20294 | + .flags = AuWrDir_ADD_ENTRY | |
20295 | + }; | |
20296 | + | |
20297 | + IMustLock(dir); | |
5527c038 | 20298 | + inode = d_inode(src_dentry); |
4a4d8108 AM |
20299 | + IMustLock(inode); |
20300 | + | |
4a4d8108 AM |
20301 | + err = -ENOMEM; |
20302 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
20303 | + if (unlikely(!a)) | |
20304 | + goto out; | |
20305 | + | |
20306 | + a->parent = dentry->d_parent; /* dir inode is locked */ | |
027c5e7a AM |
20307 | + err = aufs_read_and_write_lock2(dentry, src_dentry, |
20308 | + AuLock_NOPLM | AuLock_GEN); | |
e49829fe JR |
20309 | + if (unlikely(err)) |
20310 | + goto out_kfree; | |
38d290e6 | 20311 | + err = au_d_linkable(src_dentry); |
027c5e7a AM |
20312 | + if (unlikely(err)) |
20313 | + goto out_unlock; | |
20314 | + err = au_d_may_add(dentry); | |
20315 | + if (unlikely(err)) | |
20316 | + goto out_unlock; | |
e49829fe | 20317 | + |
4a4d8108 | 20318 | + a->src_parent = dget_parent(src_dentry); |
5afbbe0d | 20319 | + wr_dir_args.force_btgt = au_ibtop(inode); |
4a4d8108 AM |
20320 | + |
20321 | + di_write_lock_parent(a->parent); | |
20322 | + wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); | |
20323 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, | |
20324 | + &wr_dir_args); | |
20325 | + err = PTR_ERR(wh_dentry); | |
20326 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 20327 | + goto out_parent; |
4a4d8108 AM |
20328 | + |
20329 | + err = 0; | |
20330 | + sb = dentry->d_sb; | |
5afbbe0d | 20331 | + a->bdst = au_dbtop(dentry); |
4a4d8108 AM |
20332 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); |
20333 | + a->h_path.mnt = au_sbr_mnt(sb, a->bdst); | |
5afbbe0d | 20334 | + a->bsrc = au_ibtop(inode); |
2cbb1c4b | 20335 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); |
38d290e6 JR |
20336 | + if (!h_src_dentry && au_di(src_dentry)->di_tmpfile) |
20337 | + h_src_dentry = dget(au_hi_wh(inode, a->bsrc)); | |
2cbb1c4b | 20338 | + if (!h_src_dentry) { |
5afbbe0d | 20339 | + a->bsrc = au_dbtop(src_dentry); |
2cbb1c4b JR |
20340 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); |
20341 | + AuDebugOn(!h_src_dentry); | |
38d290e6 JR |
20342 | + } else if (IS_ERR(h_src_dentry)) { |
20343 | + err = PTR_ERR(h_src_dentry); | |
2cbb1c4b | 20344 | + goto out_parent; |
38d290e6 | 20345 | + } |
2cbb1c4b | 20346 | + |
f2c43d5f AM |
20347 | + /* |
20348 | + * aufs doesn't touch the credential so | |
acd2b654 | 20349 | + * security_dentry_create_files_as() is unnecessary. |
f2c43d5f | 20350 | + */ |
4a4d8108 AM |
20351 | + if (au_opt_test(au_mntflags(sb), PLINK)) { |
20352 | + if (a->bdst < a->bsrc | |
20353 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) | |
86dc4139 | 20354 | + err = au_cpup_or_link(src_dentry, dentry, a); |
523b37e3 AM |
20355 | + else { |
20356 | + delegated = NULL; | |
4a4d8108 | 20357 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), |
523b37e3 AM |
20358 | + &a->h_path, &delegated); |
20359 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20360 | + pr_warn("cannot retry for NFSv4 delegation" | |
20361 | + " for an internal link\n"); | |
20362 | + iput(delegated); | |
20363 | + } | |
20364 | + } | |
2cbb1c4b | 20365 | + dput(h_src_dentry); |
4a4d8108 AM |
20366 | + } else { |
20367 | + /* | |
20368 | + * copyup src_dentry to the branch we process, | |
20369 | + * and then link(2) to it. | |
20370 | + */ | |
2cbb1c4b | 20371 | + dput(h_src_dentry); |
4a4d8108 AM |
20372 | + if (a->bdst < a->bsrc |
20373 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { | |
20374 | + au_unpin(&a->pin); | |
20375 | + di_write_unlock(a->parent); | |
20376 | + err = au_cpup_before_link(src_dentry, a); | |
20377 | + di_write_lock_parent(a->parent); | |
20378 | + if (!err) | |
20379 | + err = au_pin(&a->pin, dentry, a->bdst, | |
20380 | + au_opt_udba(sb), | |
20381 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
20382 | + if (unlikely(err)) | |
20383 | + goto out_wh; | |
20384 | + } | |
20385 | + if (!err) { | |
20386 | + h_src_dentry = au_h_dptr(src_dentry, a->bdst); | |
20387 | + err = -ENOENT; | |
5527c038 | 20388 | + if (h_src_dentry && d_is_positive(h_src_dentry)) { |
523b37e3 | 20389 | + delegated = NULL; |
4a4d8108 AM |
20390 | + err = vfsub_link(h_src_dentry, |
20391 | + au_pinned_h_dir(&a->pin), | |
523b37e3 AM |
20392 | + &a->h_path, &delegated); |
20393 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20394 | + pr_warn("cannot retry" | |
20395 | + " for NFSv4 delegation" | |
20396 | + " for an internal link\n"); | |
20397 | + iput(delegated); | |
20398 | + } | |
20399 | + } | |
4a4d8108 AM |
20400 | + } |
20401 | + } | |
20402 | + if (unlikely(err)) | |
20403 | + goto out_unpin; | |
20404 | + | |
20405 | + if (wh_dentry) { | |
20406 | + a->h_path.dentry = wh_dentry; | |
20407 | + err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, | |
20408 | + dentry); | |
20409 | + if (unlikely(err)) | |
20410 | + goto out_revert; | |
20411 | + } | |
20412 | + | |
b912730e | 20413 | + au_dir_ts(dir, a->bdst); |
be118d29 | 20414 | + inode_inc_iversion(dir); |
4a4d8108 AM |
20415 | + inc_nlink(inode); |
20416 | + inode->i_ctime = dir->i_ctime; | |
027c5e7a AM |
20417 | + d_instantiate(dentry, au_igrab(inode)); |
20418 | + if (d_unhashed(a->h_path.dentry)) | |
4a4d8108 AM |
20419 | + /* some filesystem calls d_drop() */ |
20420 | + d_drop(dentry); | |
076b876e AM |
20421 | + /* some filesystems consume an inode even hardlink */ |
20422 | + au_fhsm_wrote(sb, a->bdst, /*force*/0); | |
4a4d8108 AM |
20423 | + goto out_unpin; /* success */ |
20424 | + | |
4f0767ce | 20425 | +out_revert: |
523b37e3 AM |
20426 | + /* no delegation since it is just created */ |
20427 | + rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, | |
20428 | + /*delegated*/NULL, /*force*/0); | |
027c5e7a | 20429 | + if (unlikely(rerr)) { |
523b37e3 | 20430 | + AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr); |
027c5e7a AM |
20431 | + err = -EIO; |
20432 | + } | |
4a4d8108 | 20433 | + au_dtime_revert(&dt); |
4f0767ce | 20434 | +out_unpin: |
4a4d8108 | 20435 | + au_unpin(&a->pin); |
4f0767ce | 20436 | +out_wh: |
4a4d8108 | 20437 | + dput(wh_dentry); |
027c5e7a AM |
20438 | +out_parent: |
20439 | + di_write_unlock(a->parent); | |
20440 | + dput(a->src_parent); | |
4f0767ce | 20441 | +out_unlock: |
4a4d8108 | 20442 | + if (unlikely(err)) { |
5afbbe0d | 20443 | + au_update_dbtop(dentry); |
4a4d8108 AM |
20444 | + d_drop(dentry); |
20445 | + } | |
4a4d8108 | 20446 | + aufs_read_and_write_unlock2(dentry, src_dentry); |
e49829fe | 20447 | +out_kfree: |
9f237c51 | 20448 | + au_kfree_rcu(a); |
4f0767ce | 20449 | +out: |
86dc4139 | 20450 | + AuTraceErr(err); |
4a4d8108 AM |
20451 | + return err; |
20452 | +} | |
20453 | + | |
7eafdf33 | 20454 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
4a4d8108 AM |
20455 | +{ |
20456 | + int err, rerr; | |
20457 | + aufs_bindex_t bindex; | |
20458 | + unsigned char diropq; | |
20459 | + struct path h_path; | |
20460 | + struct dentry *wh_dentry, *parent, *opq_dentry; | |
febd17d6 | 20461 | + struct inode *h_inode; |
4a4d8108 AM |
20462 | + struct super_block *sb; |
20463 | + struct { | |
20464 | + struct au_pin pin; | |
20465 | + struct au_dtime dt; | |
20466 | + } *a; /* reduce the stack usage */ | |
20467 | + struct au_wr_dir_args wr_dir_args = { | |
20468 | + .force_btgt = -1, | |
20469 | + .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR | |
20470 | + }; | |
20471 | + | |
20472 | + IMustLock(dir); | |
20473 | + | |
20474 | + err = -ENOMEM; | |
20475 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
20476 | + if (unlikely(!a)) | |
20477 | + goto out; | |
20478 | + | |
027c5e7a AM |
20479 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
20480 | + if (unlikely(err)) | |
20481 | + goto out_free; | |
20482 | + err = au_d_may_add(dentry); | |
20483 | + if (unlikely(err)) | |
20484 | + goto out_unlock; | |
20485 | + | |
4a4d8108 AM |
20486 | + parent = dentry->d_parent; /* dir inode is locked */ |
20487 | + di_write_lock_parent(parent); | |
20488 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, | |
20489 | + &a->pin, &wr_dir_args); | |
20490 | + err = PTR_ERR(wh_dentry); | |
20491 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 20492 | + goto out_parent; |
4a4d8108 AM |
20493 | + |
20494 | + sb = dentry->d_sb; | |
5afbbe0d | 20495 | + bindex = au_dbtop(dentry); |
4a4d8108 AM |
20496 | + h_path.dentry = au_h_dptr(dentry, bindex); |
20497 | + h_path.mnt = au_sbr_mnt(sb, bindex); | |
20498 | + err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); | |
20499 | + if (unlikely(err)) | |
027c5e7a | 20500 | + goto out_unpin; |
4a4d8108 AM |
20501 | + |
20502 | + /* make the dir opaque */ | |
20503 | + diropq = 0; | |
febd17d6 | 20504 | + h_inode = d_inode(h_path.dentry); |
4a4d8108 AM |
20505 | + if (wh_dentry |
20506 | + || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { | |
febd17d6 | 20507 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
4a4d8108 | 20508 | + opq_dentry = au_diropq_create(dentry, bindex); |
febd17d6 | 20509 | + inode_unlock(h_inode); |
4a4d8108 AM |
20510 | + err = PTR_ERR(opq_dentry); |
20511 | + if (IS_ERR(opq_dentry)) | |
20512 | + goto out_dir; | |
20513 | + dput(opq_dentry); | |
20514 | + diropq = 1; | |
20515 | + } | |
20516 | + | |
20517 | + err = epilog(dir, bindex, wh_dentry, dentry); | |
20518 | + if (!err) { | |
20519 | + inc_nlink(dir); | |
027c5e7a | 20520 | + goto out_unpin; /* success */ |
4a4d8108 AM |
20521 | + } |
20522 | + | |
20523 | + /* revert */ | |
20524 | + if (diropq) { | |
20525 | + AuLabel(revert opq); | |
febd17d6 | 20526 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
4a4d8108 | 20527 | + rerr = au_diropq_remove(dentry, bindex); |
febd17d6 | 20528 | + inode_unlock(h_inode); |
4a4d8108 | 20529 | + if (rerr) { |
523b37e3 AM |
20530 | + AuIOErr("%pd reverting diropq failed(%d, %d)\n", |
20531 | + dentry, err, rerr); | |
4a4d8108 AM |
20532 | + err = -EIO; |
20533 | + } | |
20534 | + } | |
20535 | + | |
4f0767ce | 20536 | +out_dir: |
4a4d8108 AM |
20537 | + AuLabel(revert dir); |
20538 | + rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); | |
20539 | + if (rerr) { | |
523b37e3 AM |
20540 | + AuIOErr("%pd reverting dir failed(%d, %d)\n", |
20541 | + dentry, err, rerr); | |
4a4d8108 AM |
20542 | + err = -EIO; |
20543 | + } | |
4a4d8108 | 20544 | + au_dtime_revert(&a->dt); |
027c5e7a | 20545 | +out_unpin: |
4a4d8108 AM |
20546 | + au_unpin(&a->pin); |
20547 | + dput(wh_dentry); | |
027c5e7a AM |
20548 | +out_parent: |
20549 | + di_write_unlock(parent); | |
20550 | +out_unlock: | |
4a4d8108 | 20551 | + if (unlikely(err)) { |
5afbbe0d | 20552 | + au_update_dbtop(dentry); |
4a4d8108 AM |
20553 | + d_drop(dentry); |
20554 | + } | |
4a4d8108 | 20555 | + aufs_read_unlock(dentry, AuLock_DW); |
027c5e7a | 20556 | +out_free: |
9f237c51 | 20557 | + au_kfree_rcu(a); |
4f0767ce | 20558 | +out: |
4a4d8108 AM |
20559 | + return err; |
20560 | +} | |
7f207e10 | 20561 | diff -urN /usr/share/empty/fs/aufs/i_op.c linux/fs/aufs/i_op.c |
eca34b5c | 20562 | --- /usr/share/empty/fs/aufs/i_op.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 20563 | +++ linux/fs/aufs/i_op.c 2020-04-03 08:16:47.547461775 +0200 |
43982f53 | 20564 | @@ -0,0 +1,1498 @@ |
cd7a4cd9 | 20565 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 20566 | +/* |
016522bc | 20567 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
4a4d8108 AM |
20568 | + * |
20569 | + * This program, aufs is free software; you can redistribute it and/or modify | |
20570 | + * it under the terms of the GNU General Public License as published by | |
20571 | + * the Free Software Foundation; either version 2 of the License, or | |
20572 | + * (at your option) any later version. | |
20573 | + * | |
20574 | + * This program is distributed in the hope that it will be useful, | |
20575 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20576 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20577 | + * GNU General Public License for more details. | |
20578 | + * | |
20579 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 20580 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 20581 | + */ |
1facf9fc | 20582 | + |
1308ab2a | 20583 | +/* |
4a4d8108 | 20584 | + * inode operations (except add/del/rename) |
1308ab2a | 20585 | + */ |
4a4d8108 AM |
20586 | + |
20587 | +#include <linux/device_cgroup.h> | |
20588 | +#include <linux/fs_stack.h> | |
eca801bf | 20589 | +#include <linux/iversion.h> |
4a4d8108 AM |
20590 | +#include <linux/namei.h> |
20591 | +#include <linux/security.h> | |
4a4d8108 AM |
20592 | +#include "aufs.h" |
20593 | + | |
1e00d052 | 20594 | +static int h_permission(struct inode *h_inode, int mask, |
79b8bda9 | 20595 | + struct path *h_path, int brperm) |
1facf9fc | 20596 | +{ |
1308ab2a | 20597 | + int err; |
4a4d8108 | 20598 | + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); |
1facf9fc | 20599 | + |
e2f27e51 AM |
20600 | + err = -EPERM; |
20601 | + if (write_mask && IS_IMMUTABLE(h_inode)) | |
20602 | + goto out; | |
20603 | + | |
4a4d8108 | 20604 | + err = -EACCES; |
e2f27e51 AM |
20605 | + if (((mask & MAY_EXEC) |
20606 | + && S_ISREG(h_inode->i_mode) | |
20607 | + && (path_noexec(h_path) | |
cd7a4cd9 | 20608 | + || !(h_inode->i_mode & 0111)))) |
4a4d8108 AM |
20609 | + goto out; |
20610 | + | |
20611 | + /* | |
20612 | + * - skip the lower fs test in the case of write to ro branch. | |
20613 | + * - nfs dir permission write check is optimized, but a policy for | |
20614 | + * link/rename requires a real check. | |
2121bcd9 | 20615 | + * - nfs always sets SB_POSIXACL regardless its mount option 'noacl.' |
b912730e | 20616 | + * in this case, generic_permission() returns -EOPNOTSUPP. |
4a4d8108 AM |
20617 | + */ |
20618 | + if ((write_mask && !au_br_writable(brperm)) | |
20619 | + || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode) | |
20620 | + && write_mask && !(mask & MAY_READ)) | |
20621 | + || !h_inode->i_op->permission) { | |
20622 | + /* AuLabel(generic_permission); */ | |
062440b3 | 20623 | + /* AuDbg("get_acl %ps\n", h_inode->i_op->get_acl); */ |
1e00d052 | 20624 | + err = generic_permission(h_inode, mask); |
b912730e AM |
20625 | + if (err == -EOPNOTSUPP && au_test_nfs_noacl(h_inode)) |
20626 | + err = h_inode->i_op->permission(h_inode, mask); | |
20627 | + AuTraceErr(err); | |
1308ab2a | 20628 | + } else { |
4a4d8108 | 20629 | + /* AuLabel(h_inode->permission); */ |
1e00d052 | 20630 | + err = h_inode->i_op->permission(h_inode, mask); |
4a4d8108 AM |
20631 | + AuTraceErr(err); |
20632 | + } | |
1facf9fc | 20633 | + |
4a4d8108 AM |
20634 | + if (!err) |
20635 | + err = devcgroup_inode_permission(h_inode, mask); | |
7f207e10 | 20636 | + if (!err) |
4a4d8108 | 20637 | + err = security_inode_permission(h_inode, mask); |
4a4d8108 | 20638 | + |
4f0767ce | 20639 | +out: |
1308ab2a | 20640 | + return err; |
20641 | +} | |
dece6358 | 20642 | + |
1e00d052 | 20643 | +static int aufs_permission(struct inode *inode, int mask) |
1308ab2a | 20644 | +{ |
20645 | + int err; | |
5afbbe0d | 20646 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
20647 | + const unsigned char isdir = !!S_ISDIR(inode->i_mode), |
20648 | + write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); | |
20649 | + struct inode *h_inode; | |
20650 | + struct super_block *sb; | |
20651 | + struct au_branch *br; | |
1facf9fc | 20652 | + |
027c5e7a | 20653 | + /* todo: support rcu-walk? */ |
1e00d052 | 20654 | + if (mask & MAY_NOT_BLOCK) |
027c5e7a AM |
20655 | + return -ECHILD; |
20656 | + | |
4a4d8108 AM |
20657 | + sb = inode->i_sb; |
20658 | + si_read_lock(sb, AuLock_FLUSH); | |
20659 | + ii_read_lock_child(inode); | |
43982f53 AM |
20660 | +#if 0 /* reserved for future use */ |
20661 | + /* | |
20662 | + * This test may be rather 'too much' since the test is essentially done | |
20663 | + * in the aufs_lookup(). Theoretically it is possible that the inode | |
20664 | + * generation doesn't match to the superblock's here. But it isn't a | |
20665 | + * big deal I suppose. | |
20666 | + */ | |
027c5e7a AM |
20667 | + err = au_iigen_test(inode, au_sigen(sb)); |
20668 | + if (unlikely(err)) | |
20669 | + goto out; | |
20670 | +#endif | |
dece6358 | 20671 | + |
076b876e AM |
20672 | + if (!isdir |
20673 | + || write_mask | |
20674 | + || au_opt_test(au_mntflags(sb), DIRPERM1)) { | |
4a4d8108 | 20675 | + err = au_busy_or_stale(); |
5afbbe0d | 20676 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
4a4d8108 AM |
20677 | + if (unlikely(!h_inode |
20678 | + || (h_inode->i_mode & S_IFMT) | |
20679 | + != (inode->i_mode & S_IFMT))) | |
20680 | + goto out; | |
1facf9fc | 20681 | + |
4a4d8108 | 20682 | + err = 0; |
5afbbe0d | 20683 | + bindex = au_ibtop(inode); |
4a4d8108 | 20684 | + br = au_sbr(sb, bindex); |
79b8bda9 | 20685 | + err = h_permission(h_inode, mask, &br->br_path, br->br_perm); |
4a4d8108 AM |
20686 | + if (write_mask |
20687 | + && !err | |
20688 | + && !special_file(h_inode->i_mode)) { | |
20689 | + /* test whether the upper writable branch exists */ | |
20690 | + err = -EROFS; | |
20691 | + for (; bindex >= 0; bindex--) | |
20692 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
20693 | + err = 0; | |
20694 | + break; | |
20695 | + } | |
20696 | + } | |
20697 | + goto out; | |
20698 | + } | |
dece6358 | 20699 | + |
4a4d8108 | 20700 | + /* non-write to dir */ |
1308ab2a | 20701 | + err = 0; |
5afbbe0d AM |
20702 | + bbot = au_ibbot(inode); |
20703 | + for (bindex = au_ibtop(inode); !err && bindex <= bbot; bindex++) { | |
4a4d8108 AM |
20704 | + h_inode = au_h_iptr(inode, bindex); |
20705 | + if (h_inode) { | |
20706 | + err = au_busy_or_stale(); | |
20707 | + if (unlikely(!S_ISDIR(h_inode->i_mode))) | |
20708 | + break; | |
20709 | + | |
20710 | + br = au_sbr(sb, bindex); | |
79b8bda9 | 20711 | + err = h_permission(h_inode, mask, &br->br_path, |
4a4d8108 AM |
20712 | + br->br_perm); |
20713 | + } | |
20714 | + } | |
1308ab2a | 20715 | + |
4f0767ce | 20716 | +out: |
4a4d8108 AM |
20717 | + ii_read_unlock(inode); |
20718 | + si_read_unlock(sb); | |
1308ab2a | 20719 | + return err; |
20720 | +} | |
20721 | + | |
4a4d8108 | 20722 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 20723 | + |
4a4d8108 | 20724 | +static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry, |
b4510431 | 20725 | + unsigned int flags) |
4a4d8108 AM |
20726 | +{ |
20727 | + struct dentry *ret, *parent; | |
b752ccd1 | 20728 | + struct inode *inode; |
4a4d8108 | 20729 | + struct super_block *sb; |
1716fcea | 20730 | + int err, npositive; |
dece6358 | 20731 | + |
4a4d8108 | 20732 | + IMustLock(dir); |
1308ab2a | 20733 | + |
537831f9 AM |
20734 | + /* todo: support rcu-walk? */ |
20735 | + ret = ERR_PTR(-ECHILD); | |
20736 | + if (flags & LOOKUP_RCU) | |
20737 | + goto out; | |
20738 | + | |
20739 | + ret = ERR_PTR(-ENAMETOOLONG); | |
20740 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
20741 | + goto out; | |
20742 | + | |
4a4d8108 | 20743 | + sb = dir->i_sb; |
7f207e10 AM |
20744 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
20745 | + ret = ERR_PTR(err); | |
20746 | + if (unlikely(err)) | |
20747 | + goto out; | |
20748 | + | |
4a4d8108 AM |
20749 | + err = au_di_init(dentry); |
20750 | + ret = ERR_PTR(err); | |
20751 | + if (unlikely(err)) | |
7f207e10 | 20752 | + goto out_si; |
1308ab2a | 20753 | + |
9dbd164d | 20754 | + inode = NULL; |
027c5e7a | 20755 | + npositive = 0; /* suppress a warning */ |
4a4d8108 AM |
20756 | + parent = dentry->d_parent; /* dir inode is locked */ |
20757 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a AM |
20758 | + err = au_alive_dir(parent); |
20759 | + if (!err) | |
20760 | + err = au_digen_test(parent, au_sigen(sb)); | |
20761 | + if (!err) { | |
5afbbe0d AM |
20762 | + /* regardless LOOKUP_CREATE, always ALLOW_NEG */ |
20763 | + npositive = au_lkup_dentry(dentry, au_dbtop(parent), | |
20764 | + AuLkup_ALLOW_NEG); | |
027c5e7a AM |
20765 | + err = npositive; |
20766 | + } | |
4a4d8108 | 20767 | + di_read_unlock(parent, AuLock_IR); |
4a4d8108 AM |
20768 | + ret = ERR_PTR(err); |
20769 | + if (unlikely(err < 0)) | |
20770 | + goto out_unlock; | |
1308ab2a | 20771 | + |
4a4d8108 | 20772 | + if (npositive) { |
b752ccd1 | 20773 | + inode = au_new_inode(dentry, /*must_new*/0); |
c1595e42 JR |
20774 | + if (IS_ERR(inode)) { |
20775 | + ret = (void *)inode; | |
20776 | + inode = NULL; | |
20777 | + goto out_unlock; | |
20778 | + } | |
9dbd164d | 20779 | + } |
4a4d8108 | 20780 | + |
c1595e42 JR |
20781 | + if (inode) |
20782 | + atomic_inc(&inode->i_count); | |
4a4d8108 | 20783 | + ret = d_splice_alias(inode, dentry); |
43982f53 | 20784 | +#if 0 /* reserved for future use */ |
537831f9 AM |
20785 | + if (unlikely(d_need_lookup(dentry))) { |
20786 | + spin_lock(&dentry->d_lock); | |
20787 | + dentry->d_flags &= ~DCACHE_NEED_LOOKUP; | |
20788 | + spin_unlock(&dentry->d_lock); | |
20789 | + } else | |
20790 | +#endif | |
c1595e42 | 20791 | + if (inode) { |
2000de60 | 20792 | + if (!IS_ERR(ret)) { |
c1595e42 | 20793 | + iput(inode); |
2000de60 JR |
20794 | + if (ret && ret != dentry) |
20795 | + ii_write_unlock(inode); | |
20796 | + } else { | |
c1595e42 JR |
20797 | + ii_write_unlock(inode); |
20798 | + iput(inode); | |
20799 | + inode = NULL; | |
20800 | + } | |
7f207e10 | 20801 | + } |
1facf9fc | 20802 | + |
4f0767ce | 20803 | +out_unlock: |
4a4d8108 | 20804 | + di_write_unlock(dentry); |
7f207e10 | 20805 | +out_si: |
4a4d8108 | 20806 | + si_read_unlock(sb); |
7f207e10 | 20807 | +out: |
4a4d8108 AM |
20808 | + return ret; |
20809 | +} | |
1facf9fc | 20810 | + |
4a4d8108 | 20811 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 20812 | + |
acd2b654 AM |
20813 | +/* |
20814 | + * very dirty and complicated aufs ->atomic_open(). | |
20815 | + * aufs_atomic_open() | |
20816 | + * + au_aopen_or_create() | |
20817 | + * + add_simple() | |
20818 | + * + vfsub_atomic_open() | |
20819 | + * + branch fs ->atomic_open() | |
20820 | + * may call the actual 'open' for h_file | |
20821 | + * + inc br_nfiles only if opened | |
20822 | + * + au_aopen_no_open() or au_aopen_do_open() | |
20823 | + * | |
20824 | + * au_aopen_do_open() | |
20825 | + * + finish_open() | |
20826 | + * + au_do_aopen() | |
20827 | + * + au_do_open() the body of all 'open' | |
20828 | + * + au_do_open_nondir() | |
20829 | + * set the passed h_file | |
20830 | + * | |
20831 | + * au_aopen_no_open() | |
20832 | + * + finish_no_open() | |
20833 | + */ | |
20834 | + | |
b912730e | 20835 | +struct aopen_node { |
8b6a4947 | 20836 | + struct hlist_bl_node hblist; |
b912730e AM |
20837 | + struct file *file, *h_file; |
20838 | +}; | |
20839 | + | |
20840 | +static int au_do_aopen(struct inode *inode, struct file *file) | |
20841 | +{ | |
8b6a4947 AM |
20842 | + struct hlist_bl_head *aopen; |
20843 | + struct hlist_bl_node *pos; | |
b912730e AM |
20844 | + struct aopen_node *node; |
20845 | + struct au_do_open_args args = { | |
8b6a4947 AM |
20846 | + .aopen = 1, |
20847 | + .open = au_do_open_nondir | |
b912730e AM |
20848 | + }; |
20849 | + | |
20850 | + aopen = &au_sbi(inode->i_sb)->si_aopen; | |
8b6a4947 AM |
20851 | + hlist_bl_lock(aopen); |
20852 | + hlist_bl_for_each_entry(node, pos, aopen, hblist) | |
b912730e AM |
20853 | + if (node->file == file) { |
20854 | + args.h_file = node->h_file; | |
20855 | + break; | |
20856 | + } | |
8b6a4947 | 20857 | + hlist_bl_unlock(aopen); |
b912730e AM |
20858 | + /* AuDebugOn(!args.h_file); */ |
20859 | + | |
20860 | + return au_do_open(file, &args); | |
20861 | +} | |
20862 | + | |
acd2b654 AM |
20863 | +static int au_aopen_do_open(struct file *file, struct dentry *dentry, |
20864 | + struct aopen_node *aopen_node) | |
20865 | +{ | |
20866 | + int err; | |
20867 | + struct hlist_bl_head *aopen; | |
20868 | + | |
20869 | + AuLabel(here); | |
20870 | + aopen = &au_sbi(dentry->d_sb)->si_aopen; | |
20871 | + au_hbl_add(&aopen_node->hblist, aopen); | |
20872 | + err = finish_open(file, dentry, au_do_aopen); | |
20873 | + au_hbl_del(&aopen_node->hblist, aopen); | |
20874 | + /* AuDbgFile(file); */ | |
20875 | + AuDbg("%pd%s%s\n", dentry, | |
20876 | + (file->f_mode & FMODE_CREATED) ? " created" : "", | |
20877 | + (file->f_mode & FMODE_OPENED) ? " opened" : ""); | |
20878 | + | |
20879 | + AuTraceErr(err); | |
20880 | + return err; | |
20881 | +} | |
20882 | + | |
20883 | +static int au_aopen_no_open(struct file *file, struct dentry *dentry) | |
20884 | +{ | |
20885 | + int err; | |
20886 | + | |
20887 | + AuLabel(here); | |
20888 | + dget(dentry); | |
20889 | + err = finish_no_open(file, dentry); | |
20890 | + | |
20891 | + AuTraceErr(err); | |
20892 | + return err; | |
20893 | +} | |
20894 | + | |
b912730e AM |
20895 | +static int aufs_atomic_open(struct inode *dir, struct dentry *dentry, |
20896 | + struct file *file, unsigned int open_flag, | |
acd2b654 | 20897 | + umode_t create_mode) |
b912730e | 20898 | +{ |
acd2b654 | 20899 | + int err, did_open; |
5afbbe0d | 20900 | + unsigned int lkup_flags; |
acd2b654 AM |
20901 | + aufs_bindex_t bindex; |
20902 | + struct super_block *sb; | |
f0c0a007 | 20903 | + struct dentry *parent, *d; |
b912730e AM |
20904 | + struct vfsub_aopen_args args = { |
20905 | + .open_flag = open_flag, | |
acd2b654 | 20906 | + .create_mode = create_mode |
b912730e AM |
20907 | + }; |
20908 | + struct aopen_node aopen_node = { | |
20909 | + .file = file | |
20910 | + }; | |
20911 | + | |
20912 | + IMustLock(dir); | |
5afbbe0d | 20913 | + AuDbg("open_flag 0%o\n", open_flag); |
b912730e AM |
20914 | + AuDbgDentry(dentry); |
20915 | + | |
20916 | + err = 0; | |
20917 | + if (!au_di(dentry)) { | |
5afbbe0d AM |
20918 | + lkup_flags = LOOKUP_OPEN; |
20919 | + if (open_flag & O_CREAT) | |
20920 | + lkup_flags |= LOOKUP_CREATE; | |
20921 | + d = aufs_lookup(dir, dentry, lkup_flags); | |
b912730e AM |
20922 | + if (IS_ERR(d)) { |
20923 | + err = PTR_ERR(d); | |
5afbbe0d | 20924 | + AuTraceErr(err); |
b912730e AM |
20925 | + goto out; |
20926 | + } else if (d) { | |
20927 | + /* | |
20928 | + * obsoleted dentry found. | |
20929 | + * another error will be returned later. | |
20930 | + */ | |
20931 | + d_drop(d); | |
b912730e | 20932 | + AuDbgDentry(d); |
5afbbe0d | 20933 | + dput(d); |
b912730e AM |
20934 | + } |
20935 | + AuDbgDentry(dentry); | |
20936 | + } | |
20937 | + | |
20938 | + if (d_is_positive(dentry) | |
20939 | + || d_unhashed(dentry) | |
20940 | + || d_unlinked(dentry) | |
acd2b654 AM |
20941 | + || !(open_flag & O_CREAT)) { |
20942 | + err = au_aopen_no_open(file, dentry); | |
20943 | + goto out; /* success */ | |
20944 | + } | |
b912730e AM |
20945 | + |
20946 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); | |
20947 | + if (unlikely(err)) | |
20948 | + goto out; | |
20949 | + | |
acd2b654 | 20950 | + sb = dentry->d_sb; |
b912730e AM |
20951 | + parent = dentry->d_parent; /* dir is locked */ |
20952 | + di_write_lock_parent(parent); | |
5afbbe0d | 20953 | + err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); |
acd2b654 AM |
20954 | + if (unlikely(err < 0)) |
20955 | + goto out_parent; | |
b912730e AM |
20956 | + |
20957 | + AuDbgDentry(dentry); | |
acd2b654 AM |
20958 | + if (d_is_positive(dentry)) { |
20959 | + err = au_aopen_no_open(file, dentry); | |
20960 | + goto out_parent; /* success */ | |
20961 | + } | |
b912730e | 20962 | + |
acd2b654 | 20963 | + args.file = alloc_empty_file(file->f_flags, current_cred()); |
b912730e AM |
20964 | + err = PTR_ERR(args.file); |
20965 | + if (IS_ERR(args.file)) | |
acd2b654 | 20966 | + goto out_parent; |
b912730e | 20967 | + |
acd2b654 | 20968 | + bindex = au_dbtop(dentry); |
b912730e AM |
20969 | + err = au_aopen_or_create(dir, dentry, &args); |
20970 | + AuTraceErr(err); | |
20971 | + AuDbgFile(args.file); | |
acd2b654 AM |
20972 | + file->f_mode = args.file->f_mode & ~FMODE_OPENED; |
20973 | + did_open = !!(args.file->f_mode & FMODE_OPENED); | |
20974 | + if (!did_open) { | |
20975 | + fput(args.file); | |
20976 | + args.file = NULL; | |
b912730e | 20977 | + } |
8b6a4947 AM |
20978 | + di_write_unlock(parent); |
20979 | + di_write_unlock(dentry); | |
acd2b654 AM |
20980 | + if (unlikely(err < 0)) { |
20981 | + if (args.file) | |
20982 | + fput(args.file); | |
20983 | + goto out_sb; | |
b912730e | 20984 | + } |
b912730e | 20985 | + |
acd2b654 AM |
20986 | + if (!did_open) |
20987 | + err = au_aopen_no_open(file, dentry); | |
8b6a4947 | 20988 | + else { |
acd2b654 AM |
20989 | + aopen_node.h_file = args.file; |
20990 | + err = au_aopen_do_open(file, dentry, &aopen_node); | |
8b6a4947 | 20991 | + } |
acd2b654 AM |
20992 | + if (unlikely(err < 0)) { |
20993 | + if (args.file) | |
20994 | + fput(args.file); | |
20995 | + if (did_open) | |
20996 | + au_lcnt_dec(&args.br->br_nfiles); | |
b912730e | 20997 | + } |
acd2b654 AM |
20998 | + goto out_sb; /* success */ |
20999 | + | |
21000 | +out_parent: | |
21001 | + di_write_unlock(parent); | |
21002 | + di_write_unlock(dentry); | |
21003 | +out_sb: | |
21004 | + si_read_unlock(sb); | |
b912730e | 21005 | +out: |
b912730e | 21006 | + AuTraceErr(err); |
acd2b654 | 21007 | + AuDbgFile(file); |
b912730e AM |
21008 | + return err; |
21009 | +} | |
21010 | + | |
21011 | + | |
21012 | +/* ---------------------------------------------------------------------- */ | |
21013 | + | |
4a4d8108 AM |
21014 | +static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent, |
21015 | + const unsigned char add_entry, aufs_bindex_t bcpup, | |
5afbbe0d | 21016 | + aufs_bindex_t btop) |
4a4d8108 AM |
21017 | +{ |
21018 | + int err; | |
21019 | + struct dentry *h_parent; | |
21020 | + struct inode *h_dir; | |
1facf9fc | 21021 | + |
027c5e7a | 21022 | + if (add_entry) |
5527c038 | 21023 | + IMustLock(d_inode(parent)); |
027c5e7a | 21024 | + else |
4a4d8108 AM |
21025 | + di_write_lock_parent(parent); |
21026 | + | |
21027 | + err = 0; | |
21028 | + if (!au_h_dptr(parent, bcpup)) { | |
5afbbe0d | 21029 | + if (btop > bcpup) |
c2b27bf2 | 21030 | + err = au_cpup_dirs(dentry, bcpup); |
5afbbe0d | 21031 | + else if (btop < bcpup) |
4a4d8108 AM |
21032 | + err = au_cpdown_dirs(dentry, bcpup); |
21033 | + else | |
c2b27bf2 | 21034 | + BUG(); |
4a4d8108 | 21035 | + } |
38d290e6 | 21036 | + if (!err && add_entry && !au_ftest_wrdir(add_entry, TMPFILE)) { |
4a4d8108 | 21037 | + h_parent = au_h_dptr(parent, bcpup); |
5527c038 | 21038 | + h_dir = d_inode(h_parent); |
be118d29 | 21039 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
7e9cd9fe | 21040 | + err = au_lkup_neg(dentry, bcpup, /*wh*/0); |
4a4d8108 | 21041 | + /* todo: no unlock here */ |
3c1bdaff | 21042 | + inode_unlock_shared(h_dir); |
027c5e7a AM |
21043 | + |
21044 | + AuDbg("bcpup %d\n", bcpup); | |
21045 | + if (!err) { | |
5527c038 | 21046 | + if (d_really_is_negative(dentry)) |
5afbbe0d | 21047 | + au_set_h_dptr(dentry, btop, NULL); |
4a4d8108 AM |
21048 | + au_update_dbrange(dentry, /*do_put_zero*/0); |
21049 | + } | |
1308ab2a | 21050 | + } |
1facf9fc | 21051 | + |
4a4d8108 AM |
21052 | + if (!add_entry) |
21053 | + di_write_unlock(parent); | |
21054 | + if (!err) | |
21055 | + err = bcpup; /* success */ | |
1308ab2a | 21056 | + |
027c5e7a | 21057 | + AuTraceErr(err); |
4a4d8108 AM |
21058 | + return err; |
21059 | +} | |
1facf9fc | 21060 | + |
4a4d8108 AM |
21061 | +/* |
21062 | + * decide the branch and the parent dir where we will create a new entry. | |
21063 | + * returns new bindex or an error. | |
21064 | + * copyup the parent dir if needed. | |
21065 | + */ | |
21066 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
21067 | + struct au_wr_dir_args *args) | |
21068 | +{ | |
21069 | + int err; | |
392086de | 21070 | + unsigned int flags; |
5afbbe0d | 21071 | + aufs_bindex_t bcpup, btop, src_btop; |
86dc4139 AM |
21072 | + const unsigned char add_entry |
21073 | + = au_ftest_wrdir(args->flags, ADD_ENTRY) | |
38d290e6 | 21074 | + | au_ftest_wrdir(args->flags, TMPFILE); |
4a4d8108 AM |
21075 | + struct super_block *sb; |
21076 | + struct dentry *parent; | |
21077 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 21078 | + |
4a4d8108 AM |
21079 | + sb = dentry->d_sb; |
21080 | + sbinfo = au_sbi(sb); | |
21081 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
21082 | + btop = au_dbtop(dentry); |
21083 | + bcpup = btop; | |
4a4d8108 AM |
21084 | + if (args->force_btgt < 0) { |
21085 | + if (src_dentry) { | |
5afbbe0d AM |
21086 | + src_btop = au_dbtop(src_dentry); |
21087 | + if (src_btop < btop) | |
21088 | + bcpup = src_btop; | |
4a4d8108 | 21089 | + } else if (add_entry) { |
392086de AM |
21090 | + flags = 0; |
21091 | + if (au_ftest_wrdir(args->flags, ISDIR)) | |
21092 | + au_fset_wbr(flags, DIR); | |
21093 | + err = AuWbrCreate(sbinfo, dentry, flags); | |
4a4d8108 AM |
21094 | + bcpup = err; |
21095 | + } | |
1facf9fc | 21096 | + |
5527c038 | 21097 | + if (bcpup < 0 || au_test_ro(sb, bcpup, d_inode(dentry))) { |
4a4d8108 AM |
21098 | + if (add_entry) |
21099 | + err = AuWbrCopyup(sbinfo, dentry); | |
21100 | + else { | |
21101 | + if (!IS_ROOT(dentry)) { | |
21102 | + di_read_lock_parent(parent, !AuLock_IR); | |
21103 | + err = AuWbrCopyup(sbinfo, dentry); | |
21104 | + di_read_unlock(parent, !AuLock_IR); | |
21105 | + } else | |
21106 | + err = AuWbrCopyup(sbinfo, dentry); | |
21107 | + } | |
21108 | + bcpup = err; | |
21109 | + if (unlikely(err < 0)) | |
21110 | + goto out; | |
21111 | + } | |
21112 | + } else { | |
21113 | + bcpup = args->force_btgt; | |
5527c038 | 21114 | + AuDebugOn(au_test_ro(sb, bcpup, d_inode(dentry))); |
1308ab2a | 21115 | + } |
027c5e7a | 21116 | + |
5afbbe0d | 21117 | + AuDbg("btop %d, bcpup %d\n", btop, bcpup); |
4a4d8108 | 21118 | + err = bcpup; |
5afbbe0d | 21119 | + if (bcpup == btop) |
4a4d8108 | 21120 | + goto out; /* success */ |
4a4d8108 AM |
21121 | + |
21122 | + /* copyup the new parent into the branch we process */ | |
5afbbe0d | 21123 | + err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, btop); |
027c5e7a | 21124 | + if (err >= 0) { |
5527c038 | 21125 | + if (d_really_is_negative(dentry)) { |
5afbbe0d AM |
21126 | + au_set_h_dptr(dentry, btop, NULL); |
21127 | + au_set_dbtop(dentry, bcpup); | |
21128 | + au_set_dbbot(dentry, bcpup); | |
027c5e7a | 21129 | + } |
38d290e6 JR |
21130 | + AuDebugOn(add_entry |
21131 | + && !au_ftest_wrdir(args->flags, TMPFILE) | |
21132 | + && !au_h_dptr(dentry, bcpup)); | |
027c5e7a | 21133 | + } |
86dc4139 AM |
21134 | + |
21135 | +out: | |
21136 | + dput(parent); | |
21137 | + return err; | |
21138 | +} | |
21139 | + | |
21140 | +/* ---------------------------------------------------------------------- */ | |
21141 | + | |
21142 | +void au_pin_hdir_unlock(struct au_pin *p) | |
21143 | +{ | |
21144 | + if (p->hdir) | |
5afbbe0d | 21145 | + au_hn_inode_unlock(p->hdir); |
86dc4139 AM |
21146 | +} |
21147 | + | |
c1595e42 | 21148 | +int au_pin_hdir_lock(struct au_pin *p) |
86dc4139 AM |
21149 | +{ |
21150 | + int err; | |
21151 | + | |
21152 | + err = 0; | |
21153 | + if (!p->hdir) | |
21154 | + goto out; | |
21155 | + | |
21156 | + /* even if an error happens later, keep this lock */ | |
5afbbe0d | 21157 | + au_hn_inode_lock_nested(p->hdir, p->lsc_hi); |
86dc4139 AM |
21158 | + |
21159 | + err = -EBUSY; | |
5527c038 | 21160 | + if (unlikely(p->hdir->hi_inode != d_inode(p->h_parent))) |
86dc4139 AM |
21161 | + goto out; |
21162 | + | |
21163 | + err = 0; | |
21164 | + if (p->h_dentry) | |
21165 | + err = au_h_verify(p->h_dentry, p->udba, p->hdir->hi_inode, | |
21166 | + p->h_parent, p->br); | |
21167 | + | |
21168 | +out: | |
21169 | + return err; | |
21170 | +} | |
21171 | + | |
21172 | +int au_pin_hdir_relock(struct au_pin *p) | |
21173 | +{ | |
21174 | + int err, i; | |
21175 | + struct inode *h_i; | |
21176 | + struct dentry *h_d[] = { | |
21177 | + p->h_dentry, | |
21178 | + p->h_parent | |
21179 | + }; | |
21180 | + | |
21181 | + err = au_pin_hdir_lock(p); | |
21182 | + if (unlikely(err)) | |
21183 | + goto out; | |
21184 | + | |
21185 | + for (i = 0; !err && i < sizeof(h_d)/sizeof(*h_d); i++) { | |
21186 | + if (!h_d[i]) | |
21187 | + continue; | |
5527c038 JR |
21188 | + if (d_is_positive(h_d[i])) { |
21189 | + h_i = d_inode(h_d[i]); | |
86dc4139 | 21190 | + err = !h_i->i_nlink; |
5527c038 | 21191 | + } |
86dc4139 AM |
21192 | + } |
21193 | + | |
21194 | +out: | |
21195 | + return err; | |
21196 | +} | |
21197 | + | |
5afbbe0d | 21198 | +static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task) |
86dc4139 | 21199 | +{ |
eca34b5c | 21200 | + atomic_long_set(&p->hdir->hi_inode->i_rwsem.owner, (long)task); |
86dc4139 AM |
21201 | +} |
21202 | + | |
21203 | +void au_pin_hdir_acquire_nest(struct au_pin *p) | |
21204 | +{ | |
21205 | + if (p->hdir) { | |
5afbbe0d | 21206 | + rwsem_acquire_nest(&p->hdir->hi_inode->i_rwsem.dep_map, |
86dc4139 AM |
21207 | + p->lsc_hi, 0, NULL, _RET_IP_); |
21208 | + au_pin_hdir_set_owner(p, current); | |
21209 | + } | |
dece6358 | 21210 | +} |
1facf9fc | 21211 | + |
86dc4139 AM |
21212 | +void au_pin_hdir_release(struct au_pin *p) |
21213 | +{ | |
21214 | + if (p->hdir) { | |
21215 | + au_pin_hdir_set_owner(p, p->task); | |
5afbbe0d | 21216 | + rwsem_release(&p->hdir->hi_inode->i_rwsem.dep_map, 1, _RET_IP_); |
86dc4139 AM |
21217 | + } |
21218 | +} | |
1308ab2a | 21219 | + |
4a4d8108 | 21220 | +struct dentry *au_pinned_h_parent(struct au_pin *pin) |
1308ab2a | 21221 | +{ |
4a4d8108 AM |
21222 | + if (pin && pin->parent) |
21223 | + return au_h_dptr(pin->parent, pin->bindex); | |
21224 | + return NULL; | |
dece6358 | 21225 | +} |
1facf9fc | 21226 | + |
4a4d8108 | 21227 | +void au_unpin(struct au_pin *p) |
dece6358 | 21228 | +{ |
86dc4139 AM |
21229 | + if (p->hdir) |
21230 | + au_pin_hdir_unlock(p); | |
e49829fe | 21231 | + if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE)) |
b4510431 | 21232 | + vfsub_mnt_drop_write(p->h_mnt); |
4a4d8108 AM |
21233 | + if (!p->hdir) |
21234 | + return; | |
1facf9fc | 21235 | + |
4a4d8108 AM |
21236 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21237 | + di_read_unlock(p->parent, AuLock_IR); | |
21238 | + iput(p->hdir->hi_inode); | |
21239 | + dput(p->parent); | |
21240 | + p->parent = NULL; | |
21241 | + p->hdir = NULL; | |
21242 | + p->h_mnt = NULL; | |
86dc4139 | 21243 | + /* do not clear p->task */ |
4a4d8108 | 21244 | +} |
1308ab2a | 21245 | + |
4a4d8108 AM |
21246 | +int au_do_pin(struct au_pin *p) |
21247 | +{ | |
21248 | + int err; | |
21249 | + struct super_block *sb; | |
4a4d8108 AM |
21250 | + struct inode *h_dir; |
21251 | + | |
21252 | + err = 0; | |
21253 | + sb = p->dentry->d_sb; | |
86dc4139 | 21254 | + p->br = au_sbr(sb, p->bindex); |
4a4d8108 AM |
21255 | + if (IS_ROOT(p->dentry)) { |
21256 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { | |
86dc4139 | 21257 | + p->h_mnt = au_br_mnt(p->br); |
b4510431 | 21258 | + err = vfsub_mnt_want_write(p->h_mnt); |
4a4d8108 AM |
21259 | + if (unlikely(err)) { |
21260 | + au_fclr_pin(p->flags, MNT_WRITE); | |
21261 | + goto out_err; | |
21262 | + } | |
21263 | + } | |
dece6358 | 21264 | + goto out; |
1facf9fc | 21265 | + } |
21266 | + | |
86dc4139 | 21267 | + p->h_dentry = NULL; |
5afbbe0d | 21268 | + if (p->bindex <= au_dbbot(p->dentry)) |
86dc4139 | 21269 | + p->h_dentry = au_h_dptr(p->dentry, p->bindex); |
dece6358 | 21270 | + |
4a4d8108 AM |
21271 | + p->parent = dget_parent(p->dentry); |
21272 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
21273 | + di_read_lock(p->parent, AuLock_IR, p->lsc_di); | |
dece6358 | 21274 | + |
4a4d8108 | 21275 | + h_dir = NULL; |
86dc4139 | 21276 | + p->h_parent = au_h_dptr(p->parent, p->bindex); |
5527c038 | 21277 | + p->hdir = au_hi(d_inode(p->parent), p->bindex); |
4a4d8108 AM |
21278 | + if (p->hdir) |
21279 | + h_dir = p->hdir->hi_inode; | |
dece6358 | 21280 | + |
b752ccd1 AM |
21281 | + /* |
21282 | + * udba case, or | |
21283 | + * if DI_LOCKED is not set, then p->parent may be different | |
21284 | + * and h_parent can be NULL. | |
21285 | + */ | |
86dc4139 | 21286 | + if (unlikely(!p->hdir || !h_dir || !p->h_parent)) { |
e49829fe | 21287 | + err = -EBUSY; |
4a4d8108 AM |
21288 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21289 | + di_read_unlock(p->parent, AuLock_IR); | |
21290 | + dput(p->parent); | |
21291 | + p->parent = NULL; | |
21292 | + goto out_err; | |
21293 | + } | |
1308ab2a | 21294 | + |
4a4d8108 | 21295 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { |
86dc4139 | 21296 | + p->h_mnt = au_br_mnt(p->br); |
b4510431 | 21297 | + err = vfsub_mnt_want_write(p->h_mnt); |
dece6358 | 21298 | + if (unlikely(err)) { |
4a4d8108 | 21299 | + au_fclr_pin(p->flags, MNT_WRITE); |
86dc4139 AM |
21300 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21301 | + di_read_unlock(p->parent, AuLock_IR); | |
21302 | + dput(p->parent); | |
21303 | + p->parent = NULL; | |
21304 | + goto out_err; | |
dece6358 AM |
21305 | + } |
21306 | + } | |
4a4d8108 | 21307 | + |
86dc4139 AM |
21308 | + au_igrab(h_dir); |
21309 | + err = au_pin_hdir_lock(p); | |
21310 | + if (!err) | |
21311 | + goto out; /* success */ | |
21312 | + | |
076b876e AM |
21313 | + au_unpin(p); |
21314 | + | |
4f0767ce | 21315 | +out_err: |
4a4d8108 AM |
21316 | + pr_err("err %d\n", err); |
21317 | + err = au_busy_or_stale(); | |
4f0767ce | 21318 | +out: |
1facf9fc | 21319 | + return err; |
21320 | +} | |
21321 | + | |
4a4d8108 AM |
21322 | +void au_pin_init(struct au_pin *p, struct dentry *dentry, |
21323 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
21324 | + unsigned int udba, unsigned char flags) | |
21325 | +{ | |
21326 | + p->dentry = dentry; | |
21327 | + p->udba = udba; | |
21328 | + p->lsc_di = lsc_di; | |
21329 | + p->lsc_hi = lsc_hi; | |
21330 | + p->flags = flags; | |
21331 | + p->bindex = bindex; | |
21332 | + | |
21333 | + p->parent = NULL; | |
21334 | + p->hdir = NULL; | |
21335 | + p->h_mnt = NULL; | |
86dc4139 AM |
21336 | + |
21337 | + p->h_dentry = NULL; | |
21338 | + p->h_parent = NULL; | |
21339 | + p->br = NULL; | |
21340 | + p->task = current; | |
4a4d8108 AM |
21341 | +} |
21342 | + | |
21343 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
21344 | + unsigned int udba, unsigned char flags) | |
21345 | +{ | |
21346 | + au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2, | |
21347 | + udba, flags); | |
21348 | + return au_do_pin(pin); | |
21349 | +} | |
21350 | + | |
dece6358 AM |
21351 | +/* ---------------------------------------------------------------------- */ |
21352 | + | |
1308ab2a | 21353 | +/* |
4a4d8108 AM |
21354 | + * ->setattr() and ->getattr() are called in various cases. |
21355 | + * chmod, stat: dentry is revalidated. | |
21356 | + * fchmod, fstat: file and dentry are not revalidated, additionally they may be | |
21357 | + * unhashed. | |
21358 | + * for ->setattr(), ia->ia_file is passed from ftruncate only. | |
1308ab2a | 21359 | + */ |
027c5e7a | 21360 | +/* todo: consolidate with do_refresh() and simple_reval_dpath() */ |
c1595e42 | 21361 | +int au_reval_for_attr(struct dentry *dentry, unsigned int sigen) |
1facf9fc | 21362 | +{ |
4a4d8108 | 21363 | + int err; |
4a4d8108 | 21364 | + struct dentry *parent; |
1facf9fc | 21365 | + |
1308ab2a | 21366 | + err = 0; |
027c5e7a | 21367 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 AM |
21368 | + parent = dget_parent(dentry); |
21369 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 21370 | + err = au_refresh_dentry(dentry, parent); |
4a4d8108 AM |
21371 | + di_read_unlock(parent, AuLock_IR); |
21372 | + dput(parent); | |
dece6358 | 21373 | + } |
1facf9fc | 21374 | + |
4a4d8108 | 21375 | + AuTraceErr(err); |
1308ab2a | 21376 | + return err; |
21377 | +} | |
dece6358 | 21378 | + |
c1595e42 JR |
21379 | +int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, |
21380 | + struct au_icpup_args *a) | |
1308ab2a | 21381 | +{ |
21382 | + int err; | |
4a4d8108 | 21383 | + loff_t sz; |
5afbbe0d | 21384 | + aufs_bindex_t btop, ibtop; |
4a4d8108 AM |
21385 | + struct dentry *hi_wh, *parent; |
21386 | + struct inode *inode; | |
4a4d8108 AM |
21387 | + struct au_wr_dir_args wr_dir_args = { |
21388 | + .force_btgt = -1, | |
21389 | + .flags = 0 | |
21390 | + }; | |
21391 | + | |
2000de60 | 21392 | + if (d_is_dir(dentry)) |
4a4d8108 AM |
21393 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); |
21394 | + /* plink or hi_wh() case */ | |
5afbbe0d | 21395 | + btop = au_dbtop(dentry); |
5527c038 | 21396 | + inode = d_inode(dentry); |
5afbbe0d AM |
21397 | + ibtop = au_ibtop(inode); |
21398 | + if (btop != ibtop && !au_test_ro(inode->i_sb, ibtop, inode)) | |
21399 | + wr_dir_args.force_btgt = ibtop; | |
4a4d8108 AM |
21400 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
21401 | + if (unlikely(err < 0)) | |
21402 | + goto out; | |
21403 | + a->btgt = err; | |
5afbbe0d | 21404 | + if (err != btop) |
4a4d8108 AM |
21405 | + au_fset_icpup(a->flags, DID_CPUP); |
21406 | + | |
21407 | + err = 0; | |
21408 | + a->pin_flags = AuPin_MNT_WRITE; | |
21409 | + parent = NULL; | |
21410 | + if (!IS_ROOT(dentry)) { | |
21411 | + au_fset_pin(a->pin_flags, DI_LOCKED); | |
21412 | + parent = dget_parent(dentry); | |
21413 | + di_write_lock_parent(parent); | |
21414 | + } | |
21415 | + | |
21416 | + err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags); | |
21417 | + if (unlikely(err)) | |
21418 | + goto out_parent; | |
21419 | + | |
4a4d8108 | 21420 | + sz = -1; |
5afbbe0d | 21421 | + a->h_path.dentry = au_h_dptr(dentry, btop); |
5527c038 | 21422 | + a->h_inode = d_inode(a->h_path.dentry); |
c1595e42 | 21423 | + if (ia && (ia->ia_valid & ATTR_SIZE)) { |
be118d29 | 21424 | + inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); |
c1595e42 JR |
21425 | + if (ia->ia_size < i_size_read(a->h_inode)) |
21426 | + sz = ia->ia_size; | |
3c1bdaff | 21427 | + inode_unlock_shared(a->h_inode); |
c1595e42 | 21428 | + } |
4a4d8108 | 21429 | + |
4a4d8108 | 21430 | + hi_wh = NULL; |
027c5e7a | 21431 | + if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) { |
4a4d8108 AM |
21432 | + hi_wh = au_hi_wh(inode, a->btgt); |
21433 | + if (!hi_wh) { | |
c2b27bf2 AM |
21434 | + struct au_cp_generic cpg = { |
21435 | + .dentry = dentry, | |
21436 | + .bdst = a->btgt, | |
21437 | + .bsrc = -1, | |
21438 | + .len = sz, | |
21439 | + .pin = &a->pin | |
21440 | + }; | |
21441 | + err = au_sio_cpup_wh(&cpg, /*file*/NULL); | |
4a4d8108 AM |
21442 | + if (unlikely(err)) |
21443 | + goto out_unlock; | |
21444 | + hi_wh = au_hi_wh(inode, a->btgt); | |
21445 | + /* todo: revalidate hi_wh? */ | |
21446 | + } | |
21447 | + } | |
21448 | + | |
21449 | + if (parent) { | |
21450 | + au_pin_set_parent_lflag(&a->pin, /*lflag*/0); | |
21451 | + di_downgrade_lock(parent, AuLock_IR); | |
21452 | + dput(parent); | |
21453 | + parent = NULL; | |
21454 | + } | |
21455 | + if (!au_ftest_icpup(a->flags, DID_CPUP)) | |
21456 | + goto out; /* success */ | |
21457 | + | |
21458 | + if (!d_unhashed(dentry)) { | |
c2b27bf2 AM |
21459 | + struct au_cp_generic cpg = { |
21460 | + .dentry = dentry, | |
21461 | + .bdst = a->btgt, | |
5afbbe0d | 21462 | + .bsrc = btop, |
c2b27bf2 AM |
21463 | + .len = sz, |
21464 | + .pin = &a->pin, | |
21465 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
21466 | + }; | |
21467 | + err = au_sio_cpup_simple(&cpg); | |
4a4d8108 AM |
21468 | + if (!err) |
21469 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
21470 | + } else if (!hi_wh) | |
21471 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
21472 | + else | |
21473 | + a->h_path.dentry = hi_wh; /* do not dget here */ | |
1308ab2a | 21474 | + |
4f0767ce | 21475 | +out_unlock: |
5527c038 | 21476 | + a->h_inode = d_inode(a->h_path.dentry); |
86dc4139 | 21477 | + if (!err) |
dece6358 | 21478 | + goto out; /* success */ |
4a4d8108 | 21479 | + au_unpin(&a->pin); |
4f0767ce | 21480 | +out_parent: |
4a4d8108 AM |
21481 | + if (parent) { |
21482 | + di_write_unlock(parent); | |
21483 | + dput(parent); | |
21484 | + } | |
4f0767ce | 21485 | +out: |
86dc4139 | 21486 | + if (!err) |
febd17d6 | 21487 | + inode_lock_nested(a->h_inode, AuLsc_I_CHILD); |
1facf9fc | 21488 | + return err; |
21489 | +} | |
21490 | + | |
4a4d8108 | 21491 | +static int aufs_setattr(struct dentry *dentry, struct iattr *ia) |
1facf9fc | 21492 | +{ |
4a4d8108 | 21493 | + int err; |
523b37e3 | 21494 | + struct inode *inode, *delegated; |
4a4d8108 AM |
21495 | + struct super_block *sb; |
21496 | + struct file *file; | |
21497 | + struct au_icpup_args *a; | |
1facf9fc | 21498 | + |
5527c038 | 21499 | + inode = d_inode(dentry); |
4a4d8108 | 21500 | + IMustLock(inode); |
dece6358 | 21501 | + |
f2c43d5f AM |
21502 | + err = setattr_prepare(dentry, ia); |
21503 | + if (unlikely(err)) | |
21504 | + goto out; | |
21505 | + | |
4a4d8108 AM |
21506 | + err = -ENOMEM; |
21507 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
21508 | + if (unlikely(!a)) | |
21509 | + goto out; | |
1facf9fc | 21510 | + |
4a4d8108 AM |
21511 | + if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
21512 | + ia->ia_valid &= ~ATTR_MODE; | |
dece6358 | 21513 | + |
4a4d8108 AM |
21514 | + file = NULL; |
21515 | + sb = dentry->d_sb; | |
e49829fe JR |
21516 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
21517 | + if (unlikely(err)) | |
21518 | + goto out_kfree; | |
21519 | + | |
4a4d8108 AM |
21520 | + if (ia->ia_valid & ATTR_FILE) { |
21521 | + /* currently ftruncate(2) only */ | |
7e9cd9fe | 21522 | + AuDebugOn(!d_is_reg(dentry)); |
4a4d8108 | 21523 | + file = ia->ia_file; |
521ced18 JR |
21524 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, |
21525 | + /*fi_lsc*/0); | |
4a4d8108 AM |
21526 | + if (unlikely(err)) |
21527 | + goto out_si; | |
21528 | + ia->ia_file = au_hf_top(file); | |
21529 | + a->udba = AuOpt_UDBA_NONE; | |
21530 | + } else { | |
21531 | + /* fchmod() doesn't pass ia_file */ | |
21532 | + a->udba = au_opt_udba(sb); | |
027c5e7a AM |
21533 | + di_write_lock_child(dentry); |
21534 | + /* no d_unlinked(), to set UDBA_NONE for root */ | |
4a4d8108 AM |
21535 | + if (d_unhashed(dentry)) |
21536 | + a->udba = AuOpt_UDBA_NONE; | |
4a4d8108 AM |
21537 | + if (a->udba != AuOpt_UDBA_NONE) { |
21538 | + AuDebugOn(IS_ROOT(dentry)); | |
21539 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
21540 | + if (unlikely(err)) | |
21541 | + goto out_dentry; | |
21542 | + } | |
dece6358 | 21543 | + } |
dece6358 | 21544 | + |
4a4d8108 AM |
21545 | + err = au_pin_and_icpup(dentry, ia, a); |
21546 | + if (unlikely(err < 0)) | |
21547 | + goto out_dentry; | |
21548 | + if (au_ftest_icpup(a->flags, DID_CPUP)) { | |
21549 | + ia->ia_file = NULL; | |
21550 | + ia->ia_valid &= ~ATTR_FILE; | |
1308ab2a | 21551 | + } |
dece6358 | 21552 | + |
4a4d8108 AM |
21553 | + a->h_path.mnt = au_sbr_mnt(sb, a->btgt); |
21554 | + if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME)) | |
21555 | + == (ATTR_MODE | ATTR_CTIME)) { | |
7eafdf33 | 21556 | + err = security_path_chmod(&a->h_path, ia->ia_mode); |
4a4d8108 AM |
21557 | + if (unlikely(err)) |
21558 | + goto out_unlock; | |
21559 | + } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID)) | |
21560 | + && (ia->ia_valid & ATTR_CTIME)) { | |
86dc4139 | 21561 | + err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid); |
4a4d8108 AM |
21562 | + if (unlikely(err)) |
21563 | + goto out_unlock; | |
21564 | + } | |
dece6358 | 21565 | + |
4a4d8108 AM |
21566 | + if (ia->ia_valid & ATTR_SIZE) { |
21567 | + struct file *f; | |
1308ab2a | 21568 | + |
953406b4 | 21569 | + if (ia->ia_size < i_size_read(inode)) |
4a4d8108 | 21570 | + /* unmap only */ |
953406b4 | 21571 | + truncate_setsize(inode, ia->ia_size); |
1308ab2a | 21572 | + |
4a4d8108 AM |
21573 | + f = NULL; |
21574 | + if (ia->ia_valid & ATTR_FILE) | |
21575 | + f = ia->ia_file; | |
febd17d6 | 21576 | + inode_unlock(a->h_inode); |
4a4d8108 | 21577 | + err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f); |
febd17d6 | 21578 | + inode_lock_nested(a->h_inode, AuLsc_I_CHILD); |
523b37e3 AM |
21579 | + } else { |
21580 | + delegated = NULL; | |
21581 | + while (1) { | |
21582 | + err = vfsub_notify_change(&a->h_path, ia, &delegated); | |
21583 | + if (delegated) { | |
21584 | + err = break_deleg_wait(&delegated); | |
21585 | + if (!err) | |
21586 | + continue; | |
21587 | + } | |
21588 | + break; | |
21589 | + } | |
21590 | + } | |
8cdd5066 JR |
21591 | + /* |
21592 | + * regardless aufs 'acl' option setting. | |
21593 | + * why don't all acl-aware fs call this func from their ->setattr()? | |
21594 | + */ | |
21595 | + if (!err && (ia->ia_valid & ATTR_MODE)) | |
21596 | + err = vfsub_acl_chmod(a->h_inode, ia->ia_mode); | |
4a4d8108 AM |
21597 | + if (!err) |
21598 | + au_cpup_attr_changeable(inode); | |
1308ab2a | 21599 | + |
4f0767ce | 21600 | +out_unlock: |
febd17d6 | 21601 | + inode_unlock(a->h_inode); |
4a4d8108 | 21602 | + au_unpin(&a->pin); |
027c5e7a | 21603 | + if (unlikely(err)) |
5afbbe0d | 21604 | + au_update_dbtop(dentry); |
4f0767ce | 21605 | +out_dentry: |
4a4d8108 AM |
21606 | + di_write_unlock(dentry); |
21607 | + if (file) { | |
21608 | + fi_write_unlock(file); | |
21609 | + ia->ia_file = file; | |
21610 | + ia->ia_valid |= ATTR_FILE; | |
21611 | + } | |
4f0767ce | 21612 | +out_si: |
4a4d8108 | 21613 | + si_read_unlock(sb); |
e49829fe | 21614 | +out_kfree: |
9f237c51 | 21615 | + au_kfree_rcu(a); |
4f0767ce | 21616 | +out: |
4a4d8108 AM |
21617 | + AuTraceErr(err); |
21618 | + return err; | |
1facf9fc | 21619 | +} |
21620 | + | |
c1595e42 JR |
21621 | +#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) |
21622 | +static int au_h_path_to_set_attr(struct dentry *dentry, | |
21623 | + struct au_icpup_args *a, struct path *h_path) | |
21624 | +{ | |
21625 | + int err; | |
21626 | + struct super_block *sb; | |
21627 | + | |
21628 | + sb = dentry->d_sb; | |
21629 | + a->udba = au_opt_udba(sb); | |
21630 | + /* no d_unlinked(), to set UDBA_NONE for root */ | |
21631 | + if (d_unhashed(dentry)) | |
21632 | + a->udba = AuOpt_UDBA_NONE; | |
21633 | + if (a->udba != AuOpt_UDBA_NONE) { | |
21634 | + AuDebugOn(IS_ROOT(dentry)); | |
21635 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
21636 | + if (unlikely(err)) | |
21637 | + goto out; | |
21638 | + } | |
21639 | + err = au_pin_and_icpup(dentry, /*ia*/NULL, a); | |
21640 | + if (unlikely(err < 0)) | |
21641 | + goto out; | |
21642 | + | |
21643 | + h_path->dentry = a->h_path.dentry; | |
21644 | + h_path->mnt = au_sbr_mnt(sb, a->btgt); | |
21645 | + | |
21646 | +out: | |
21647 | + return err; | |
21648 | +} | |
21649 | + | |
f2c43d5f AM |
21650 | +ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, |
21651 | + struct au_sxattr *arg) | |
c1595e42 JR |
21652 | +{ |
21653 | + int err; | |
21654 | + struct path h_path; | |
21655 | + struct super_block *sb; | |
21656 | + struct au_icpup_args *a; | |
5afbbe0d | 21657 | + struct inode *h_inode; |
c1595e42 | 21658 | + |
c1595e42 JR |
21659 | + IMustLock(inode); |
21660 | + | |
21661 | + err = -ENOMEM; | |
21662 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
21663 | + if (unlikely(!a)) | |
21664 | + goto out; | |
21665 | + | |
21666 | + sb = dentry->d_sb; | |
21667 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
21668 | + if (unlikely(err)) | |
21669 | + goto out_kfree; | |
21670 | + | |
21671 | + h_path.dentry = NULL; /* silence gcc */ | |
21672 | + di_write_lock_child(dentry); | |
21673 | + err = au_h_path_to_set_attr(dentry, a, &h_path); | |
21674 | + if (unlikely(err)) | |
21675 | + goto out_di; | |
21676 | + | |
febd17d6 | 21677 | + inode_unlock(a->h_inode); |
c1595e42 JR |
21678 | + switch (arg->type) { |
21679 | + case AU_XATTR_SET: | |
5afbbe0d | 21680 | + AuDebugOn(d_is_negative(h_path.dentry)); |
c1595e42 JR |
21681 | + err = vfsub_setxattr(h_path.dentry, |
21682 | + arg->u.set.name, arg->u.set.value, | |
21683 | + arg->u.set.size, arg->u.set.flags); | |
21684 | + break; | |
c1595e42 JR |
21685 | + case AU_ACL_SET: |
21686 | + err = -EOPNOTSUPP; | |
5527c038 | 21687 | + h_inode = d_inode(h_path.dentry); |
c1595e42 | 21688 | + if (h_inode->i_op->set_acl) |
f2c43d5f | 21689 | + /* this will call posix_acl_update_mode */ |
c1595e42 JR |
21690 | + err = h_inode->i_op->set_acl(h_inode, |
21691 | + arg->u.acl_set.acl, | |
21692 | + arg->u.acl_set.type); | |
21693 | + break; | |
21694 | + } | |
21695 | + if (!err) | |
21696 | + au_cpup_attr_timesizes(inode); | |
21697 | + | |
21698 | + au_unpin(&a->pin); | |
21699 | + if (unlikely(err)) | |
5afbbe0d | 21700 | + au_update_dbtop(dentry); |
c1595e42 JR |
21701 | + |
21702 | +out_di: | |
21703 | + di_write_unlock(dentry); | |
21704 | + si_read_unlock(sb); | |
21705 | +out_kfree: | |
9f237c51 | 21706 | + au_kfree_rcu(a); |
c1595e42 JR |
21707 | +out: |
21708 | + AuTraceErr(err); | |
21709 | + return err; | |
21710 | +} | |
21711 | +#endif | |
21712 | + | |
4a4d8108 AM |
21713 | +static void au_refresh_iattr(struct inode *inode, struct kstat *st, |
21714 | + unsigned int nlink) | |
1facf9fc | 21715 | +{ |
9dbd164d AM |
21716 | + unsigned int n; |
21717 | + | |
4a4d8108 | 21718 | + inode->i_mode = st->mode; |
86dc4139 AM |
21719 | + /* don't i_[ug]id_write() here */ |
21720 | + inode->i_uid = st->uid; | |
21721 | + inode->i_gid = st->gid; | |
4a4d8108 AM |
21722 | + inode->i_atime = st->atime; |
21723 | + inode->i_mtime = st->mtime; | |
21724 | + inode->i_ctime = st->ctime; | |
1facf9fc | 21725 | + |
4a4d8108 AM |
21726 | + au_cpup_attr_nlink(inode, /*force*/0); |
21727 | + if (S_ISDIR(inode->i_mode)) { | |
9dbd164d AM |
21728 | + n = inode->i_nlink; |
21729 | + n -= nlink; | |
21730 | + n += st->nlink; | |
f6b6e03d | 21731 | + smp_mb(); /* for i_nlink */ |
7eafdf33 | 21732 | + /* 0 can happen */ |
92d182d2 | 21733 | + set_nlink(inode, n); |
4a4d8108 | 21734 | + } |
1facf9fc | 21735 | + |
4a4d8108 AM |
21736 | + spin_lock(&inode->i_lock); |
21737 | + inode->i_blocks = st->blocks; | |
21738 | + i_size_write(inode, st->size); | |
21739 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 21740 | +} |
21741 | + | |
c1595e42 | 21742 | +/* |
f2c43d5f | 21743 | + * common routine for aufs_getattr() and au_getxattr(). |
c1595e42 JR |
21744 | + * returns zero or negative (an error). |
21745 | + * @dentry will be read-locked in success. | |
21746 | + */ | |
a2654f78 AM |
21747 | +int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, |
21748 | + int locked) | |
1facf9fc | 21749 | +{ |
4a4d8108 | 21750 | + int err; |
076b876e | 21751 | + unsigned int mnt_flags, sigen; |
c1595e42 | 21752 | + unsigned char udba_none; |
4a4d8108 | 21753 | + aufs_bindex_t bindex; |
4a4d8108 AM |
21754 | + struct super_block *sb, *h_sb; |
21755 | + struct inode *inode; | |
1facf9fc | 21756 | + |
c1595e42 JR |
21757 | + h_path->mnt = NULL; |
21758 | + h_path->dentry = NULL; | |
21759 | + | |
21760 | + err = 0; | |
4a4d8108 | 21761 | + sb = dentry->d_sb; |
4a4d8108 AM |
21762 | + mnt_flags = au_mntflags(sb); |
21763 | + udba_none = !!au_opt_test(mnt_flags, UDBA_NONE); | |
1facf9fc | 21764 | + |
a2654f78 AM |
21765 | + if (unlikely(locked)) |
21766 | + goto body; /* skip locking dinfo */ | |
21767 | + | |
4a4d8108 | 21768 | + /* support fstat(2) */ |
027c5e7a | 21769 | + if (!d_unlinked(dentry) && !udba_none) { |
076b876e | 21770 | + sigen = au_sigen(sb); |
027c5e7a AM |
21771 | + err = au_digen_test(dentry, sigen); |
21772 | + if (!err) { | |
4a4d8108 | 21773 | + di_read_lock_child(dentry, AuLock_IR); |
027c5e7a | 21774 | + err = au_dbrange_test(dentry); |
c1595e42 JR |
21775 | + if (unlikely(err)) { |
21776 | + di_read_unlock(dentry, AuLock_IR); | |
21777 | + goto out; | |
21778 | + } | |
027c5e7a | 21779 | + } else { |
4a4d8108 AM |
21780 | + AuDebugOn(IS_ROOT(dentry)); |
21781 | + di_write_lock_child(dentry); | |
027c5e7a AM |
21782 | + err = au_dbrange_test(dentry); |
21783 | + if (!err) | |
21784 | + err = au_reval_for_attr(dentry, sigen); | |
c1595e42 JR |
21785 | + if (!err) |
21786 | + di_downgrade_lock(dentry, AuLock_IR); | |
21787 | + else { | |
21788 | + di_write_unlock(dentry); | |
21789 | + goto out; | |
21790 | + } | |
4a4d8108 AM |
21791 | + } |
21792 | + } else | |
21793 | + di_read_lock_child(dentry, AuLock_IR); | |
1facf9fc | 21794 | + |
a2654f78 | 21795 | +body: |
5527c038 | 21796 | + inode = d_inode(dentry); |
5afbbe0d | 21797 | + bindex = au_ibtop(inode); |
c1595e42 JR |
21798 | + h_path->mnt = au_sbr_mnt(sb, bindex); |
21799 | + h_sb = h_path->mnt->mnt_sb; | |
21800 | + if (!force | |
21801 | + && !au_test_fs_bad_iattr(h_sb) | |
21802 | + && udba_none) | |
21803 | + goto out; /* success */ | |
1facf9fc | 21804 | + |
5afbbe0d | 21805 | + if (au_dbtop(dentry) == bindex) |
c1595e42 | 21806 | + h_path->dentry = au_h_dptr(dentry, bindex); |
4a4d8108 | 21807 | + else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) { |
c1595e42 JR |
21808 | + h_path->dentry = au_plink_lkup(inode, bindex); |
21809 | + if (IS_ERR(h_path->dentry)) | |
21810 | + /* pretending success */ | |
21811 | + h_path->dentry = NULL; | |
21812 | + else | |
21813 | + dput(h_path->dentry); | |
4a4d8108 | 21814 | + } |
c1595e42 JR |
21815 | + |
21816 | +out: | |
21817 | + return err; | |
21818 | +} | |
21819 | + | |
521ced18 JR |
21820 | +static int aufs_getattr(const struct path *path, struct kstat *st, |
21821 | + u32 request, unsigned int query) | |
c1595e42 JR |
21822 | +{ |
21823 | + int err; | |
21824 | + unsigned char positive; | |
21825 | + struct path h_path; | |
521ced18 | 21826 | + struct dentry *dentry; |
c1595e42 JR |
21827 | + struct inode *inode; |
21828 | + struct super_block *sb; | |
21829 | + | |
521ced18 | 21830 | + dentry = path->dentry; |
5527c038 | 21831 | + inode = d_inode(dentry); |
c1595e42 JR |
21832 | + sb = dentry->d_sb; |
21833 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
21834 | + if (unlikely(err)) | |
21835 | + goto out; | |
a2654f78 | 21836 | + err = au_h_path_getattr(dentry, /*force*/0, &h_path, /*locked*/0); |
c1595e42 JR |
21837 | + if (unlikely(err)) |
21838 | + goto out_si; | |
c06a8ce3 | 21839 | + if (unlikely(!h_path.dentry)) |
c1595e42 | 21840 | + /* illegally overlapped or something */ |
4a4d8108 AM |
21841 | + goto out_fill; /* pretending success */ |
21842 | + | |
5527c038 | 21843 | + positive = d_is_positive(h_path.dentry); |
4a4d8108 | 21844 | + if (positive) |
521ced18 JR |
21845 | + /* no vfsub version */ |
21846 | + err = vfs_getattr(&h_path, st, request, query); | |
4a4d8108 AM |
21847 | + if (!err) { |
21848 | + if (positive) | |
c06a8ce3 | 21849 | + au_refresh_iattr(inode, st, |
5527c038 | 21850 | + d_inode(h_path.dentry)->i_nlink); |
4a4d8108 | 21851 | + goto out_fill; /* success */ |
1facf9fc | 21852 | + } |
7f207e10 | 21853 | + AuTraceErr(err); |
c1595e42 | 21854 | + goto out_di; |
4a4d8108 | 21855 | + |
4f0767ce | 21856 | +out_fill: |
4a4d8108 | 21857 | + generic_fillattr(inode, st); |
c1595e42 | 21858 | +out_di: |
4a4d8108 | 21859 | + di_read_unlock(dentry, AuLock_IR); |
c1595e42 | 21860 | +out_si: |
4a4d8108 | 21861 | + si_read_unlock(sb); |
7f207e10 AM |
21862 | +out: |
21863 | + AuTraceErr(err); | |
4a4d8108 | 21864 | + return err; |
1facf9fc | 21865 | +} |
21866 | + | |
21867 | +/* ---------------------------------------------------------------------- */ | |
21868 | + | |
febd17d6 JR |
21869 | +static const char *aufs_get_link(struct dentry *dentry, struct inode *inode, |
21870 | + struct delayed_call *done) | |
4a4d8108 | 21871 | +{ |
c2c0f25c | 21872 | + const char *ret; |
c2c0f25c | 21873 | + struct dentry *h_dentry; |
febd17d6 | 21874 | + struct inode *h_inode; |
4a4d8108 | 21875 | + int err; |
c2c0f25c | 21876 | + aufs_bindex_t bindex; |
1facf9fc | 21877 | + |
79b8bda9 | 21878 | + ret = NULL; /* suppress a warning */ |
febd17d6 JR |
21879 | + err = -ECHILD; |
21880 | + if (!dentry) | |
21881 | + goto out; | |
21882 | + | |
027c5e7a AM |
21883 | + err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN); |
21884 | + if (unlikely(err)) | |
c2c0f25c | 21885 | + goto out; |
027c5e7a AM |
21886 | + |
21887 | + err = au_d_hashed_positive(dentry); | |
c2c0f25c AM |
21888 | + if (unlikely(err)) |
21889 | + goto out_unlock; | |
21890 | + | |
21891 | + err = -EINVAL; | |
21892 | + inode = d_inode(dentry); | |
5afbbe0d | 21893 | + bindex = au_ibtop(inode); |
c2c0f25c | 21894 | + h_inode = au_h_iptr(inode, bindex); |
febd17d6 | 21895 | + if (unlikely(!h_inode->i_op->get_link)) |
c2c0f25c AM |
21896 | + goto out_unlock; |
21897 | + | |
21898 | + err = -EBUSY; | |
21899 | + h_dentry = NULL; | |
5afbbe0d | 21900 | + if (au_dbtop(dentry) <= bindex) { |
c2c0f25c AM |
21901 | + h_dentry = au_h_dptr(dentry, bindex); |
21902 | + if (h_dentry) | |
21903 | + dget(h_dentry); | |
027c5e7a | 21904 | + } |
c2c0f25c AM |
21905 | + if (!h_dentry) { |
21906 | + h_dentry = d_find_any_alias(h_inode); | |
21907 | + if (IS_ERR(h_dentry)) { | |
21908 | + err = PTR_ERR(h_dentry); | |
febd17d6 | 21909 | + goto out_unlock; |
c2c0f25c AM |
21910 | + } |
21911 | + } | |
21912 | + if (unlikely(!h_dentry)) | |
febd17d6 | 21913 | + goto out_unlock; |
1facf9fc | 21914 | + |
c2c0f25c | 21915 | + err = 0; |
062440b3 | 21916 | + AuDbg("%ps\n", h_inode->i_op->get_link); |
c2c0f25c | 21917 | + AuDbgDentry(h_dentry); |
f2c43d5f | 21918 | + ret = vfs_get_link(h_dentry, done); |
c2c0f25c | 21919 | + dput(h_dentry); |
febd17d6 JR |
21920 | + if (IS_ERR(ret)) |
21921 | + err = PTR_ERR(ret); | |
c2c0f25c | 21922 | + |
c2c0f25c AM |
21923 | +out_unlock: |
21924 | + aufs_read_unlock(dentry, AuLock_IR); | |
4f0767ce | 21925 | +out: |
c2c0f25c AM |
21926 | + if (unlikely(err)) |
21927 | + ret = ERR_PTR(err); | |
21928 | + AuTraceErrPtr(ret); | |
21929 | + return ret; | |
4a4d8108 | 21930 | +} |
1facf9fc | 21931 | + |
4a4d8108 | 21932 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 21933 | + |
e2f27e51 AM |
21934 | +static int au_is_special(struct inode *inode) |
21935 | +{ | |
21936 | + return (inode->i_mode & (S_IFBLK | S_IFCHR | S_IFIFO | S_IFSOCK)); | |
21937 | +} | |
21938 | + | |
acd2b654 AM |
21939 | +static int aufs_update_time(struct inode *inode, struct timespec64 *ts, |
21940 | + int flags) | |
4a4d8108 | 21941 | +{ |
0c3ec466 | 21942 | + int err; |
e2f27e51 | 21943 | + aufs_bindex_t bindex; |
0c3ec466 AM |
21944 | + struct super_block *sb; |
21945 | + struct inode *h_inode; | |
e2f27e51 | 21946 | + struct vfsmount *h_mnt; |
0c3ec466 AM |
21947 | + |
21948 | + sb = inode->i_sb; | |
e2f27e51 AM |
21949 | + WARN_ONCE((flags & S_ATIME) && !IS_NOATIME(inode), |
21950 | + "unexpected s_flags 0x%lx", sb->s_flags); | |
21951 | + | |
0c3ec466 AM |
21952 | + /* mmap_sem might be acquired already, cf. aufs_mmap() */ |
21953 | + lockdep_off(); | |
21954 | + si_read_lock(sb, AuLock_FLUSH); | |
21955 | + ii_write_lock_child(inode); | |
e2f27e51 AM |
21956 | + |
21957 | + err = 0; | |
21958 | + bindex = au_ibtop(inode); | |
21959 | + h_inode = au_h_iptr(inode, bindex); | |
21960 | + if (!au_test_ro(sb, bindex, inode)) { | |
21961 | + h_mnt = au_sbr_mnt(sb, bindex); | |
21962 | + err = vfsub_mnt_want_write(h_mnt); | |
21963 | + if (!err) { | |
21964 | + err = vfsub_update_time(h_inode, ts, flags); | |
21965 | + vfsub_mnt_drop_write(h_mnt); | |
21966 | + } | |
21967 | + } else if (au_is_special(h_inode)) { | |
21968 | + /* | |
21969 | + * Never copy-up here. | |
21970 | + * These special files may already be opened and used for | |
21971 | + * communicating. If we copied it up, then the communication | |
21972 | + * would be corrupted. | |
21973 | + */ | |
21974 | + AuWarn1("timestamps for i%lu are ignored " | |
21975 | + "since it is on readonly branch (hi%lu).\n", | |
21976 | + inode->i_ino, h_inode->i_ino); | |
21977 | + } else if (flags & ~S_ATIME) { | |
21978 | + err = -EIO; | |
21979 | + AuIOErr1("unexpected flags 0x%x\n", flags); | |
21980 | + AuDebugOn(1); | |
21981 | + } | |
21982 | + | |
38d290e6 JR |
21983 | + if (!err) |
21984 | + au_cpup_attr_timesizes(inode); | |
0c3ec466 AM |
21985 | + ii_write_unlock(inode); |
21986 | + si_read_unlock(sb); | |
21987 | + lockdep_on(); | |
38d290e6 JR |
21988 | + |
21989 | + if (!err && (flags & S_VERSION)) | |
21990 | + inode_inc_iversion(inode); | |
21991 | + | |
0c3ec466 | 21992 | + return err; |
4a4d8108 | 21993 | +} |
1facf9fc | 21994 | + |
4a4d8108 | 21995 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 21996 | + |
b95c5147 AM |
21997 | +/* no getattr version will be set by module.c:aufs_init() */ |
21998 | +struct inode_operations aufs_iop_nogetattr[AuIop_Last], | |
21999 | + aufs_iop[] = { | |
22000 | + [AuIop_SYMLINK] = { | |
22001 | + .permission = aufs_permission, | |
c1595e42 | 22002 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22003 | + .get_acl = aufs_get_acl, |
22004 | + .set_acl = aufs_set_acl, /* unsupport for symlink? */ | |
c1595e42 JR |
22005 | +#endif |
22006 | + | |
b95c5147 AM |
22007 | + .setattr = aufs_setattr, |
22008 | + .getattr = aufs_getattr, | |
0c3ec466 | 22009 | + |
c1595e42 | 22010 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22011 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22012 | +#endif |
22013 | + | |
febd17d6 | 22014 | + .get_link = aufs_get_link, |
0c3ec466 | 22015 | + |
b95c5147 AM |
22016 | + /* .update_time = aufs_update_time */ |
22017 | + }, | |
22018 | + [AuIop_DIR] = { | |
22019 | + .create = aufs_create, | |
22020 | + .lookup = aufs_lookup, | |
22021 | + .link = aufs_link, | |
22022 | + .unlink = aufs_unlink, | |
22023 | + .symlink = aufs_symlink, | |
22024 | + .mkdir = aufs_mkdir, | |
22025 | + .rmdir = aufs_rmdir, | |
22026 | + .mknod = aufs_mknod, | |
22027 | + .rename = aufs_rename, | |
22028 | + | |
22029 | + .permission = aufs_permission, | |
c1595e42 | 22030 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22031 | + .get_acl = aufs_get_acl, |
22032 | + .set_acl = aufs_set_acl, | |
c1595e42 JR |
22033 | +#endif |
22034 | + | |
b95c5147 AM |
22035 | + .setattr = aufs_setattr, |
22036 | + .getattr = aufs_getattr, | |
0c3ec466 | 22037 | + |
c1595e42 | 22038 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22039 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22040 | +#endif |
22041 | + | |
b95c5147 AM |
22042 | + .update_time = aufs_update_time, |
22043 | + .atomic_open = aufs_atomic_open, | |
22044 | + .tmpfile = aufs_tmpfile | |
22045 | + }, | |
22046 | + [AuIop_OTHER] = { | |
22047 | + .permission = aufs_permission, | |
c1595e42 | 22048 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22049 | + .get_acl = aufs_get_acl, |
22050 | + .set_acl = aufs_set_acl, | |
c1595e42 JR |
22051 | +#endif |
22052 | + | |
b95c5147 AM |
22053 | + .setattr = aufs_setattr, |
22054 | + .getattr = aufs_getattr, | |
0c3ec466 | 22055 | + |
c1595e42 | 22056 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22057 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22058 | +#endif |
22059 | + | |
b95c5147 AM |
22060 | + .update_time = aufs_update_time |
22061 | + } | |
4a4d8108 | 22062 | +}; |
7f207e10 | 22063 | diff -urN /usr/share/empty/fs/aufs/i_op_del.c linux/fs/aufs/i_op_del.c |
eca34b5c | 22064 | --- /usr/share/empty/fs/aufs/i_op_del.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 22065 | +++ linux/fs/aufs/i_op_del.c 2020-01-27 10:57:18.172204883 +0100 |
eca801bf | 22066 | @@ -0,0 +1,513 @@ |
cd7a4cd9 | 22067 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 22068 | +/* |
016522bc | 22069 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 22070 | + * |
22071 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22072 | + * it under the terms of the GNU General Public License as published by | |
22073 | + * the Free Software Foundation; either version 2 of the License, or | |
22074 | + * (at your option) any later version. | |
dece6358 AM |
22075 | + * |
22076 | + * This program is distributed in the hope that it will be useful, | |
22077 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22078 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22079 | + * GNU General Public License for more details. | |
22080 | + * | |
22081 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 22082 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 22083 | + */ |
22084 | + | |
22085 | +/* | |
4a4d8108 | 22086 | + * inode operations (del entry) |
1308ab2a | 22087 | + */ |
dece6358 | 22088 | + |
eca801bf | 22089 | +#include <linux/iversion.h> |
1308ab2a | 22090 | +#include "aufs.h" |
dece6358 | 22091 | + |
4a4d8108 AM |
22092 | +/* |
22093 | + * decide if a new whiteout for @dentry is necessary or not. | |
22094 | + * when it is necessary, prepare the parent dir for the upper branch whose | |
22095 | + * branch index is @bcpup for creation. the actual creation of the whiteout will | |
22096 | + * be done by caller. | |
22097 | + * return value: | |
22098 | + * 0: wh is unnecessary | |
22099 | + * plus: wh is necessary | |
22100 | + * minus: error | |
22101 | + */ | |
22102 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup) | |
1308ab2a | 22103 | +{ |
4a4d8108 | 22104 | + int need_wh, err; |
5afbbe0d | 22105 | + aufs_bindex_t btop; |
4a4d8108 | 22106 | + struct super_block *sb; |
dece6358 | 22107 | + |
4a4d8108 | 22108 | + sb = dentry->d_sb; |
5afbbe0d | 22109 | + btop = au_dbtop(dentry); |
4a4d8108 | 22110 | + if (*bcpup < 0) { |
5afbbe0d AM |
22111 | + *bcpup = btop; |
22112 | + if (au_test_ro(sb, btop, d_inode(dentry))) { | |
4a4d8108 AM |
22113 | + err = AuWbrCopyup(au_sbi(sb), dentry); |
22114 | + *bcpup = err; | |
22115 | + if (unlikely(err < 0)) | |
22116 | + goto out; | |
22117 | + } | |
22118 | + } else | |
5afbbe0d | 22119 | + AuDebugOn(btop < *bcpup |
5527c038 | 22120 | + || au_test_ro(sb, *bcpup, d_inode(dentry))); |
5afbbe0d | 22121 | + AuDbg("bcpup %d, btop %d\n", *bcpup, btop); |
1308ab2a | 22122 | + |
5afbbe0d | 22123 | + if (*bcpup != btop) { |
4a4d8108 AM |
22124 | + err = au_cpup_dirs(dentry, *bcpup); |
22125 | + if (unlikely(err)) | |
22126 | + goto out; | |
22127 | + need_wh = 1; | |
22128 | + } else { | |
027c5e7a | 22129 | + struct au_dinfo *dinfo, *tmp; |
4a4d8108 | 22130 | + |
027c5e7a AM |
22131 | + need_wh = -ENOMEM; |
22132 | + dinfo = au_di(dentry); | |
22133 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
22134 | + if (tmp) { | |
22135 | + au_di_cp(tmp, dinfo); | |
22136 | + au_di_swap(tmp, dinfo); | |
22137 | + /* returns the number of positive dentries */ | |
5afbbe0d AM |
22138 | + need_wh = au_lkup_dentry(dentry, btop + 1, |
22139 | + /* AuLkup_IGNORE_PERM */ 0); | |
027c5e7a AM |
22140 | + au_di_swap(tmp, dinfo); |
22141 | + au_rw_write_unlock(&tmp->di_rwsem); | |
22142 | + au_di_free(tmp); | |
4a4d8108 AM |
22143 | + } |
22144 | + } | |
22145 | + AuDbg("need_wh %d\n", need_wh); | |
22146 | + err = need_wh; | |
22147 | + | |
4f0767ce | 22148 | +out: |
4a4d8108 | 22149 | + return err; |
1facf9fc | 22150 | +} |
22151 | + | |
4a4d8108 AM |
22152 | +/* |
22153 | + * simple tests for the del-entry operations. | |
22154 | + * following the checks in vfs, plus the parent-child relationship. | |
22155 | + */ | |
22156 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
22157 | + struct dentry *h_parent, int isdir) | |
1facf9fc | 22158 | +{ |
4a4d8108 AM |
22159 | + int err; |
22160 | + umode_t h_mode; | |
22161 | + struct dentry *h_dentry, *h_latest; | |
1308ab2a | 22162 | + struct inode *h_inode; |
1facf9fc | 22163 | + |
4a4d8108 | 22164 | + h_dentry = au_h_dptr(dentry, bindex); |
5527c038 | 22165 | + if (d_really_is_positive(dentry)) { |
4a4d8108 | 22166 | + err = -ENOENT; |
5527c038 JR |
22167 | + if (unlikely(d_is_negative(h_dentry))) |
22168 | + goto out; | |
22169 | + h_inode = d_inode(h_dentry); | |
22170 | + if (unlikely(!h_inode->i_nlink)) | |
4a4d8108 | 22171 | + goto out; |
1facf9fc | 22172 | + |
4a4d8108 AM |
22173 | + h_mode = h_inode->i_mode; |
22174 | + if (!isdir) { | |
22175 | + err = -EISDIR; | |
22176 | + if (unlikely(S_ISDIR(h_mode))) | |
22177 | + goto out; | |
22178 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
22179 | + err = -ENOTDIR; | |
22180 | + goto out; | |
22181 | + } | |
22182 | + } else { | |
22183 | + /* rename(2) case */ | |
22184 | + err = -EIO; | |
5527c038 | 22185 | + if (unlikely(d_is_positive(h_dentry))) |
4a4d8108 AM |
22186 | + goto out; |
22187 | + } | |
1facf9fc | 22188 | + |
4a4d8108 AM |
22189 | + err = -ENOENT; |
22190 | + /* expected parent dir is locked */ | |
22191 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
22192 | + goto out; | |
22193 | + err = 0; | |
22194 | + | |
22195 | + /* | |
22196 | + * rmdir a dir may break the consistency on some filesystem. | |
22197 | + * let's try heavy test. | |
22198 | + */ | |
22199 | + err = -EACCES; | |
076b876e | 22200 | + if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1) |
5527c038 | 22201 | + && au_test_h_perm(d_inode(h_parent), |
076b876e | 22202 | + MAY_EXEC | MAY_WRITE))) |
4a4d8108 AM |
22203 | + goto out; |
22204 | + | |
076b876e | 22205 | + h_latest = au_sio_lkup_one(&dentry->d_name, h_parent); |
4a4d8108 AM |
22206 | + err = -EIO; |
22207 | + if (IS_ERR(h_latest)) | |
22208 | + goto out; | |
22209 | + if (h_latest == h_dentry) | |
22210 | + err = 0; | |
22211 | + dput(h_latest); | |
22212 | + | |
4f0767ce | 22213 | +out: |
4a4d8108 | 22214 | + return err; |
1308ab2a | 22215 | +} |
1facf9fc | 22216 | + |
4a4d8108 AM |
22217 | +/* |
22218 | + * decide the branch where we operate for @dentry. the branch index will be set | |
acd2b654 | 22219 | + * @rbcpup. after deciding it, 'pin' it and store the timestamps of the parent |
4a4d8108 AM |
22220 | + * dir for reverting. |
22221 | + * when a new whiteout is necessary, create it. | |
22222 | + */ | |
22223 | +static struct dentry* | |
22224 | +lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup, | |
22225 | + struct au_dtime *dt, struct au_pin *pin) | |
1308ab2a | 22226 | +{ |
4a4d8108 AM |
22227 | + struct dentry *wh_dentry; |
22228 | + struct super_block *sb; | |
22229 | + struct path h_path; | |
22230 | + int err, need_wh; | |
22231 | + unsigned int udba; | |
22232 | + aufs_bindex_t bcpup; | |
dece6358 | 22233 | + |
4a4d8108 AM |
22234 | + need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup); |
22235 | + wh_dentry = ERR_PTR(need_wh); | |
22236 | + if (unlikely(need_wh < 0)) | |
22237 | + goto out; | |
22238 | + | |
22239 | + sb = dentry->d_sb; | |
22240 | + udba = au_opt_udba(sb); | |
22241 | + bcpup = *rbcpup; | |
22242 | + err = au_pin(pin, dentry, bcpup, udba, | |
22243 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
22244 | + wh_dentry = ERR_PTR(err); | |
22245 | + if (unlikely(err)) | |
22246 | + goto out; | |
22247 | + | |
22248 | + h_path.dentry = au_pinned_h_parent(pin); | |
22249 | + if (udba != AuOpt_UDBA_NONE | |
5afbbe0d | 22250 | + && au_dbtop(dentry) == bcpup) { |
4a4d8108 AM |
22251 | + err = au_may_del(dentry, bcpup, h_path.dentry, isdir); |
22252 | + wh_dentry = ERR_PTR(err); | |
22253 | + if (unlikely(err)) | |
22254 | + goto out_unpin; | |
22255 | + } | |
22256 | + | |
22257 | + h_path.mnt = au_sbr_mnt(sb, bcpup); | |
22258 | + au_dtime_store(dt, au_pinned_parent(pin), &h_path); | |
22259 | + wh_dentry = NULL; | |
22260 | + if (!need_wh) | |
22261 | + goto out; /* success, no need to create whiteout */ | |
22262 | + | |
22263 | + wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry); | |
22264 | + if (IS_ERR(wh_dentry)) | |
22265 | + goto out_unpin; | |
22266 | + | |
22267 | + /* returns with the parent is locked and wh_dentry is dget-ed */ | |
22268 | + goto out; /* success */ | |
22269 | + | |
4f0767ce | 22270 | +out_unpin: |
4a4d8108 | 22271 | + au_unpin(pin); |
4f0767ce | 22272 | +out: |
4a4d8108 | 22273 | + return wh_dentry; |
1facf9fc | 22274 | +} |
22275 | + | |
4a4d8108 AM |
22276 | +/* |
22277 | + * when removing a dir, rename it to a unique temporary whiteout-ed name first | |
22278 | + * in order to be revertible and save time for removing many child whiteouts | |
22279 | + * under the dir. | |
22280 | + * returns 1 when there are too many child whiteout and caller should remove | |
22281 | + * them asynchronously. returns 0 when the number of children is enough small to | |
22282 | + * remove now or the branch fs is a remote fs. | |
22283 | + * otherwise return an error. | |
22284 | + */ | |
22285 | +static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex, | |
22286 | + struct au_nhash *whlist, struct inode *dir) | |
1facf9fc | 22287 | +{ |
4a4d8108 AM |
22288 | + int rmdir_later, err, dirwh; |
22289 | + struct dentry *h_dentry; | |
22290 | + struct super_block *sb; | |
5527c038 | 22291 | + struct inode *inode; |
4a4d8108 AM |
22292 | + |
22293 | + sb = dentry->d_sb; | |
22294 | + SiMustAnyLock(sb); | |
22295 | + h_dentry = au_h_dptr(dentry, bindex); | |
22296 | + err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex)); | |
22297 | + if (unlikely(err)) | |
22298 | + goto out; | |
22299 | + | |
22300 | + /* stop monitoring */ | |
5527c038 JR |
22301 | + inode = d_inode(dentry); |
22302 | + au_hn_free(au_hi(inode, bindex)); | |
4a4d8108 AM |
22303 | + |
22304 | + if (!au_test_fs_remote(h_dentry->d_sb)) { | |
22305 | + dirwh = au_sbi(sb)->si_dirwh; | |
22306 | + rmdir_later = (dirwh <= 1); | |
22307 | + if (!rmdir_later) | |
22308 | + rmdir_later = au_nhash_test_longer_wh(whlist, bindex, | |
22309 | + dirwh); | |
22310 | + if (rmdir_later) | |
22311 | + return rmdir_later; | |
22312 | + } | |
1facf9fc | 22313 | + |
4a4d8108 AM |
22314 | + err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist); |
22315 | + if (unlikely(err)) { | |
523b37e3 AM |
22316 | + AuIOErr("rmdir %pd, b%d failed, %d. ignored\n", |
22317 | + h_dentry, bindex, err); | |
4a4d8108 AM |
22318 | + err = 0; |
22319 | + } | |
dece6358 | 22320 | + |
4f0767ce | 22321 | +out: |
4a4d8108 AM |
22322 | + AuTraceErr(err); |
22323 | + return err; | |
22324 | +} | |
1308ab2a | 22325 | + |
4a4d8108 AM |
22326 | +/* |
22327 | + * final procedure for deleting a entry. | |
22328 | + * maintain dentry and iattr. | |
22329 | + */ | |
22330 | +static void epilog(struct inode *dir, struct dentry *dentry, | |
22331 | + aufs_bindex_t bindex) | |
22332 | +{ | |
22333 | + struct inode *inode; | |
1308ab2a | 22334 | + |
5527c038 | 22335 | + inode = d_inode(dentry); |
4a4d8108 AM |
22336 | + d_drop(dentry); |
22337 | + inode->i_ctime = dir->i_ctime; | |
1308ab2a | 22338 | + |
b912730e | 22339 | + au_dir_ts(dir, bindex); |
be118d29 | 22340 | + inode_inc_iversion(dir); |
1facf9fc | 22341 | +} |
22342 | + | |
4a4d8108 AM |
22343 | +/* |
22344 | + * when an error happened, remove the created whiteout and revert everything. | |
22345 | + */ | |
7f207e10 AM |
22346 | +static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex, |
22347 | + aufs_bindex_t bwh, struct dentry *wh_dentry, | |
22348 | + struct dentry *dentry, struct au_dtime *dt) | |
1facf9fc | 22349 | +{ |
4a4d8108 AM |
22350 | + int rerr; |
22351 | + struct path h_path = { | |
22352 | + .dentry = wh_dentry, | |
7f207e10 | 22353 | + .mnt = au_sbr_mnt(dir->i_sb, bindex) |
4a4d8108 | 22354 | + }; |
dece6358 | 22355 | + |
7f207e10 | 22356 | + rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry); |
4a4d8108 AM |
22357 | + if (!rerr) { |
22358 | + au_set_dbwh(dentry, bwh); | |
22359 | + au_dtime_revert(dt); | |
22360 | + return 0; | |
22361 | + } | |
dece6358 | 22362 | + |
523b37e3 | 22363 | + AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr); |
4a4d8108 | 22364 | + return -EIO; |
1facf9fc | 22365 | +} |
22366 | + | |
4a4d8108 | 22367 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 22368 | + |
4a4d8108 | 22369 | +int aufs_unlink(struct inode *dir, struct dentry *dentry) |
1308ab2a | 22370 | +{ |
4a4d8108 | 22371 | + int err; |
5afbbe0d | 22372 | + aufs_bindex_t bwh, bindex, btop; |
523b37e3 | 22373 | + struct inode *inode, *h_dir, *delegated; |
4a4d8108 | 22374 | + struct dentry *parent, *wh_dentry; |
acd2b654 | 22375 | + /* to reduce stack size */ |
c2b27bf2 AM |
22376 | + struct { |
22377 | + struct au_dtime dt; | |
22378 | + struct au_pin pin; | |
22379 | + struct path h_path; | |
22380 | + } *a; | |
1facf9fc | 22381 | + |
4a4d8108 | 22382 | + IMustLock(dir); |
027c5e7a | 22383 | + |
c2b27bf2 AM |
22384 | + err = -ENOMEM; |
22385 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
22386 | + if (unlikely(!a)) | |
22387 | + goto out; | |
22388 | + | |
027c5e7a AM |
22389 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
22390 | + if (unlikely(err)) | |
c2b27bf2 | 22391 | + goto out_free; |
027c5e7a AM |
22392 | + err = au_d_hashed_positive(dentry); |
22393 | + if (unlikely(err)) | |
22394 | + goto out_unlock; | |
5527c038 | 22395 | + inode = d_inode(dentry); |
4a4d8108 | 22396 | + IMustLock(inode); |
027c5e7a | 22397 | + err = -EISDIR; |
2000de60 | 22398 | + if (unlikely(d_is_dir(dentry))) |
027c5e7a | 22399 | + goto out_unlock; /* possible? */ |
1facf9fc | 22400 | + |
5afbbe0d | 22401 | + btop = au_dbtop(dentry); |
4a4d8108 AM |
22402 | + bwh = au_dbwh(dentry); |
22403 | + bindex = -1; | |
027c5e7a AM |
22404 | + parent = dentry->d_parent; /* dir inode is locked */ |
22405 | + di_write_lock_parent(parent); | |
c2b27bf2 AM |
22406 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt, |
22407 | + &a->pin); | |
4a4d8108 AM |
22408 | + err = PTR_ERR(wh_dentry); |
22409 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 22410 | + goto out_parent; |
1facf9fc | 22411 | + |
5afbbe0d AM |
22412 | + a->h_path.mnt = au_sbr_mnt(dentry->d_sb, btop); |
22413 | + a->h_path.dentry = au_h_dptr(dentry, btop); | |
c2b27bf2 | 22414 | + dget(a->h_path.dentry); |
5afbbe0d | 22415 | + if (bindex == btop) { |
c2b27bf2 | 22416 | + h_dir = au_pinned_h_dir(&a->pin); |
523b37e3 AM |
22417 | + delegated = NULL; |
22418 | + err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0); | |
22419 | + if (unlikely(err == -EWOULDBLOCK)) { | |
22420 | + pr_warn("cannot retry for NFSv4 delegation" | |
22421 | + " for an internal unlink\n"); | |
22422 | + iput(delegated); | |
22423 | + } | |
4a4d8108 AM |
22424 | + } else { |
22425 | + /* dir inode is locked */ | |
5527c038 | 22426 | + h_dir = d_inode(wh_dentry->d_parent); |
4a4d8108 AM |
22427 | + IMustLock(h_dir); |
22428 | + err = 0; | |
22429 | + } | |
dece6358 | 22430 | + |
4a4d8108 | 22431 | + if (!err) { |
7f207e10 | 22432 | + vfsub_drop_nlink(inode); |
4a4d8108 AM |
22433 | + epilog(dir, dentry, bindex); |
22434 | + | |
22435 | + /* update target timestamps */ | |
5afbbe0d | 22436 | + if (bindex == btop) { |
c2b27bf2 AM |
22437 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); |
22438 | + /*ignore*/ | |
5527c038 | 22439 | + inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; |
4a4d8108 AM |
22440 | + } else |
22441 | + /* todo: this timestamp may be reverted later */ | |
22442 | + inode->i_ctime = h_dir->i_ctime; | |
027c5e7a | 22443 | + goto out_unpin; /* success */ |
1facf9fc | 22444 | + } |
22445 | + | |
4a4d8108 AM |
22446 | + /* revert */ |
22447 | + if (wh_dentry) { | |
22448 | + int rerr; | |
22449 | + | |
c2b27bf2 AM |
22450 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, |
22451 | + &a->dt); | |
4a4d8108 AM |
22452 | + if (rerr) |
22453 | + err = rerr; | |
dece6358 | 22454 | + } |
1facf9fc | 22455 | + |
027c5e7a | 22456 | +out_unpin: |
c2b27bf2 | 22457 | + au_unpin(&a->pin); |
4a4d8108 | 22458 | + dput(wh_dentry); |
c2b27bf2 | 22459 | + dput(a->h_path.dentry); |
027c5e7a | 22460 | +out_parent: |
4a4d8108 | 22461 | + di_write_unlock(parent); |
027c5e7a | 22462 | +out_unlock: |
4a4d8108 | 22463 | + aufs_read_unlock(dentry, AuLock_DW); |
c2b27bf2 | 22464 | +out_free: |
9f237c51 | 22465 | + au_kfree_rcu(a); |
027c5e7a | 22466 | +out: |
4a4d8108 | 22467 | + return err; |
dece6358 AM |
22468 | +} |
22469 | + | |
4a4d8108 | 22470 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry) |
1308ab2a | 22471 | +{ |
4a4d8108 | 22472 | + int err, rmdir_later; |
5afbbe0d | 22473 | + aufs_bindex_t bwh, bindex, btop; |
4a4d8108 AM |
22474 | + struct inode *inode; |
22475 | + struct dentry *parent, *wh_dentry, *h_dentry; | |
22476 | + struct au_whtmp_rmdir *args; | |
acd2b654 | 22477 | + /* to reduce stack size */ |
c2b27bf2 AM |
22478 | + struct { |
22479 | + struct au_dtime dt; | |
22480 | + struct au_pin pin; | |
22481 | + } *a; | |
1facf9fc | 22482 | + |
4a4d8108 | 22483 | + IMustLock(dir); |
027c5e7a | 22484 | + |
c2b27bf2 AM |
22485 | + err = -ENOMEM; |
22486 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
22487 | + if (unlikely(!a)) | |
22488 | + goto out; | |
22489 | + | |
027c5e7a AM |
22490 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); |
22491 | + if (unlikely(err)) | |
c2b27bf2 | 22492 | + goto out_free; |
53392da6 AM |
22493 | + err = au_alive_dir(dentry); |
22494 | + if (unlikely(err)) | |
027c5e7a | 22495 | + goto out_unlock; |
5527c038 | 22496 | + inode = d_inode(dentry); |
4a4d8108 | 22497 | + IMustLock(inode); |
027c5e7a | 22498 | + err = -ENOTDIR; |
2000de60 | 22499 | + if (unlikely(!d_is_dir(dentry))) |
027c5e7a | 22500 | + goto out_unlock; /* possible? */ |
dece6358 | 22501 | + |
4a4d8108 AM |
22502 | + err = -ENOMEM; |
22503 | + args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS); | |
22504 | + if (unlikely(!args)) | |
22505 | + goto out_unlock; | |
dece6358 | 22506 | + |
4a4d8108 AM |
22507 | + parent = dentry->d_parent; /* dir inode is locked */ |
22508 | + di_write_lock_parent(parent); | |
22509 | + err = au_test_empty(dentry, &args->whlist); | |
22510 | + if (unlikely(err)) | |
027c5e7a | 22511 | + goto out_parent; |
1facf9fc | 22512 | + |
5afbbe0d | 22513 | + btop = au_dbtop(dentry); |
4a4d8108 AM |
22514 | + bwh = au_dbwh(dentry); |
22515 | + bindex = -1; | |
c2b27bf2 AM |
22516 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &a->dt, |
22517 | + &a->pin); | |
4a4d8108 AM |
22518 | + err = PTR_ERR(wh_dentry); |
22519 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 22520 | + goto out_parent; |
1facf9fc | 22521 | + |
5afbbe0d | 22522 | + h_dentry = au_h_dptr(dentry, btop); |
4a4d8108 AM |
22523 | + dget(h_dentry); |
22524 | + rmdir_later = 0; | |
5afbbe0d AM |
22525 | + if (bindex == btop) { |
22526 | + err = renwh_and_rmdir(dentry, btop, &args->whlist, dir); | |
4a4d8108 AM |
22527 | + if (err > 0) { |
22528 | + rmdir_later = err; | |
22529 | + err = 0; | |
22530 | + } | |
22531 | + } else { | |
22532 | + /* stop monitoring */ | |
5afbbe0d | 22533 | + au_hn_free(au_hi(inode, btop)); |
4a4d8108 AM |
22534 | + |
22535 | + /* dir inode is locked */ | |
5527c038 | 22536 | + IMustLock(d_inode(wh_dentry->d_parent)); |
1facf9fc | 22537 | + err = 0; |
22538 | + } | |
22539 | + | |
4a4d8108 | 22540 | + if (!err) { |
027c5e7a | 22541 | + vfsub_dead_dir(inode); |
4a4d8108 AM |
22542 | + au_set_dbdiropq(dentry, -1); |
22543 | + epilog(dir, dentry, bindex); | |
1308ab2a | 22544 | + |
4a4d8108 | 22545 | + if (rmdir_later) { |
5afbbe0d | 22546 | + au_whtmp_kick_rmdir(dir, btop, h_dentry, args); |
4a4d8108 AM |
22547 | + args = NULL; |
22548 | + } | |
1308ab2a | 22549 | + |
4a4d8108 | 22550 | + goto out_unpin; /* success */ |
1facf9fc | 22551 | + } |
22552 | + | |
4a4d8108 AM |
22553 | + /* revert */ |
22554 | + AuLabel(revert); | |
22555 | + if (wh_dentry) { | |
22556 | + int rerr; | |
1308ab2a | 22557 | + |
c2b27bf2 AM |
22558 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, |
22559 | + &a->dt); | |
4a4d8108 AM |
22560 | + if (rerr) |
22561 | + err = rerr; | |
1facf9fc | 22562 | + } |
22563 | + | |
4f0767ce | 22564 | +out_unpin: |
c2b27bf2 | 22565 | + au_unpin(&a->pin); |
4a4d8108 AM |
22566 | + dput(wh_dentry); |
22567 | + dput(h_dentry); | |
027c5e7a | 22568 | +out_parent: |
4a4d8108 AM |
22569 | + di_write_unlock(parent); |
22570 | + if (args) | |
22571 | + au_whtmp_rmdir_free(args); | |
4f0767ce | 22572 | +out_unlock: |
4a4d8108 | 22573 | + aufs_read_unlock(dentry, AuLock_DW); |
c2b27bf2 | 22574 | +out_free: |
9f237c51 | 22575 | + au_kfree_rcu(a); |
4f0767ce | 22576 | +out: |
4a4d8108 AM |
22577 | + AuTraceErr(err); |
22578 | + return err; | |
dece6358 | 22579 | +} |
7f207e10 | 22580 | diff -urN /usr/share/empty/fs/aufs/i_op_ren.c linux/fs/aufs/i_op_ren.c |
eca34b5c | 22581 | --- /usr/share/empty/fs/aufs/i_op_ren.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 22582 | +++ linux/fs/aufs/i_op_ren.c 2020-01-27 10:57:18.172204883 +0100 |
eca801bf | 22583 | @@ -0,0 +1,1250 @@ |
cd7a4cd9 | 22584 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 22585 | +/* |
016522bc | 22586 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 22587 | + * |
22588 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22589 | + * it under the terms of the GNU General Public License as published by | |
22590 | + * the Free Software Foundation; either version 2 of the License, or | |
22591 | + * (at your option) any later version. | |
dece6358 AM |
22592 | + * |
22593 | + * This program is distributed in the hope that it will be useful, | |
22594 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22595 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22596 | + * GNU General Public License for more details. | |
22597 | + * | |
22598 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 22599 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 22600 | + */ |
22601 | + | |
22602 | +/* | |
4a4d8108 AM |
22603 | + * inode operation (rename entry) |
22604 | + * todo: this is crazy monster | |
1facf9fc | 22605 | + */ |
22606 | + | |
eca801bf | 22607 | +#include <linux/iversion.h> |
1facf9fc | 22608 | +#include "aufs.h" |
22609 | + | |
4a4d8108 AM |
22610 | +enum { AuSRC, AuDST, AuSrcDst }; |
22611 | +enum { AuPARENT, AuCHILD, AuParentChild }; | |
1facf9fc | 22612 | + |
f2c43d5f AM |
22613 | +#define AuRen_ISDIR_SRC 1 |
22614 | +#define AuRen_ISDIR_DST (1 << 1) | |
22615 | +#define AuRen_ISSAMEDIR (1 << 2) | |
22616 | +#define AuRen_WHSRC (1 << 3) | |
22617 | +#define AuRen_WHDST (1 << 4) | |
22618 | +#define AuRen_MNT_WRITE (1 << 5) | |
22619 | +#define AuRen_DT_DSTDIR (1 << 6) | |
22620 | +#define AuRen_DIROPQ_SRC (1 << 7) | |
22621 | +#define AuRen_DIROPQ_DST (1 << 8) | |
8b6a4947 AM |
22622 | +#define AuRen_DIRREN (1 << 9) |
22623 | +#define AuRen_DROPPED_SRC (1 << 10) | |
22624 | +#define AuRen_DROPPED_DST (1 << 11) | |
4a4d8108 | 22625 | +#define au_ftest_ren(flags, name) ((flags) & AuRen_##name) |
7f207e10 AM |
22626 | +#define au_fset_ren(flags, name) \ |
22627 | + do { (flags) |= AuRen_##name; } while (0) | |
22628 | +#define au_fclr_ren(flags, name) \ | |
22629 | + do { (flags) &= ~AuRen_##name; } while (0) | |
1facf9fc | 22630 | + |
8b6a4947 AM |
22631 | +#ifndef CONFIG_AUFS_DIRREN |
22632 | +#undef AuRen_DIRREN | |
22633 | +#define AuRen_DIRREN 0 | |
22634 | +#endif | |
22635 | + | |
4a4d8108 AM |
22636 | +struct au_ren_args { |
22637 | + struct { | |
22638 | + struct dentry *dentry, *h_dentry, *parent, *h_parent, | |
22639 | + *wh_dentry; | |
22640 | + struct inode *dir, *inode; | |
f2c43d5f | 22641 | + struct au_hinode *hdir, *hinode; |
4a4d8108 | 22642 | + struct au_dtime dt[AuParentChild]; |
f2c43d5f | 22643 | + aufs_bindex_t btop, bdiropq; |
4a4d8108 | 22644 | + } sd[AuSrcDst]; |
1facf9fc | 22645 | + |
4a4d8108 AM |
22646 | +#define src_dentry sd[AuSRC].dentry |
22647 | +#define src_dir sd[AuSRC].dir | |
22648 | +#define src_inode sd[AuSRC].inode | |
22649 | +#define src_h_dentry sd[AuSRC].h_dentry | |
22650 | +#define src_parent sd[AuSRC].parent | |
22651 | +#define src_h_parent sd[AuSRC].h_parent | |
22652 | +#define src_wh_dentry sd[AuSRC].wh_dentry | |
22653 | +#define src_hdir sd[AuSRC].hdir | |
f2c43d5f | 22654 | +#define src_hinode sd[AuSRC].hinode |
4a4d8108 AM |
22655 | +#define src_h_dir sd[AuSRC].hdir->hi_inode |
22656 | +#define src_dt sd[AuSRC].dt | |
5afbbe0d | 22657 | +#define src_btop sd[AuSRC].btop |
f2c43d5f | 22658 | +#define src_bdiropq sd[AuSRC].bdiropq |
1facf9fc | 22659 | + |
4a4d8108 AM |
22660 | +#define dst_dentry sd[AuDST].dentry |
22661 | +#define dst_dir sd[AuDST].dir | |
22662 | +#define dst_inode sd[AuDST].inode | |
22663 | +#define dst_h_dentry sd[AuDST].h_dentry | |
22664 | +#define dst_parent sd[AuDST].parent | |
22665 | +#define dst_h_parent sd[AuDST].h_parent | |
22666 | +#define dst_wh_dentry sd[AuDST].wh_dentry | |
22667 | +#define dst_hdir sd[AuDST].hdir | |
f2c43d5f | 22668 | +#define dst_hinode sd[AuDST].hinode |
4a4d8108 AM |
22669 | +#define dst_h_dir sd[AuDST].hdir->hi_inode |
22670 | +#define dst_dt sd[AuDST].dt | |
5afbbe0d | 22671 | +#define dst_btop sd[AuDST].btop |
f2c43d5f | 22672 | +#define dst_bdiropq sd[AuDST].bdiropq |
4a4d8108 AM |
22673 | + |
22674 | + struct dentry *h_trap; | |
22675 | + struct au_branch *br; | |
4a4d8108 AM |
22676 | + struct path h_path; |
22677 | + struct au_nhash whlist; | |
f2c43d5f | 22678 | + aufs_bindex_t btgt, src_bwh; |
1facf9fc | 22679 | + |
f2c43d5f AM |
22680 | + struct { |
22681 | + unsigned short auren_flags; | |
22682 | + unsigned char flags; /* syscall parameter */ | |
22683 | + unsigned char exchange; | |
22684 | + } __packed; | |
1facf9fc | 22685 | + |
4a4d8108 AM |
22686 | + struct au_whtmp_rmdir *thargs; |
22687 | + struct dentry *h_dst; | |
8b6a4947 | 22688 | + struct au_hinode *h_root; |
4a4d8108 | 22689 | +}; |
1308ab2a | 22690 | + |
4a4d8108 | 22691 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 22692 | + |
4a4d8108 AM |
22693 | +/* |
22694 | + * functions for reverting. | |
22695 | + * when an error happened in a single rename systemcall, we should revert | |
79b8bda9 | 22696 | + * everything as if nothing happened. |
4a4d8108 AM |
22697 | + * we don't need to revert the copied-up/down the parent dir since they are |
22698 | + * harmless. | |
22699 | + */ | |
1facf9fc | 22700 | + |
4a4d8108 AM |
22701 | +#define RevertFailure(fmt, ...) do { \ |
22702 | + AuIOErr("revert failure: " fmt " (%d, %d)\n", \ | |
22703 | + ##__VA_ARGS__, err, rerr); \ | |
22704 | + err = -EIO; \ | |
22705 | +} while (0) | |
1facf9fc | 22706 | + |
f2c43d5f | 22707 | +static void au_ren_do_rev_diropq(int err, struct au_ren_args *a, int idx) |
1facf9fc | 22708 | +{ |
4a4d8108 | 22709 | + int rerr; |
f2c43d5f AM |
22710 | + struct dentry *d; |
22711 | +#define src_or_dst(member) a->sd[idx].member | |
1facf9fc | 22712 | + |
f2c43d5f AM |
22713 | + d = src_or_dst(dentry); /* {src,dst}_dentry */ |
22714 | + au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); | |
22715 | + rerr = au_diropq_remove(d, a->btgt); | |
22716 | + au_hn_inode_unlock(src_or_dst(hinode)); | |
22717 | + au_set_dbdiropq(d, src_or_dst(bdiropq)); | |
4a4d8108 | 22718 | + if (rerr) |
f2c43d5f AM |
22719 | + RevertFailure("remove diropq %pd", d); |
22720 | + | |
22721 | +#undef src_or_dst_ | |
22722 | +} | |
22723 | + | |
22724 | +static void au_ren_rev_diropq(int err, struct au_ren_args *a) | |
22725 | +{ | |
22726 | + if (au_ftest_ren(a->auren_flags, DIROPQ_SRC)) | |
22727 | + au_ren_do_rev_diropq(err, a, AuSRC); | |
22728 | + if (au_ftest_ren(a->auren_flags, DIROPQ_DST)) | |
22729 | + au_ren_do_rev_diropq(err, a, AuDST); | |
4a4d8108 | 22730 | +} |
1facf9fc | 22731 | + |
4a4d8108 AM |
22732 | +static void au_ren_rev_rename(int err, struct au_ren_args *a) |
22733 | +{ | |
22734 | + int rerr; | |
523b37e3 | 22735 | + struct inode *delegated; |
1facf9fc | 22736 | + |
b4510431 AM |
22737 | + a->h_path.dentry = vfsub_lkup_one(&a->src_dentry->d_name, |
22738 | + a->src_h_parent); | |
4a4d8108 AM |
22739 | + rerr = PTR_ERR(a->h_path.dentry); |
22740 | + if (IS_ERR(a->h_path.dentry)) { | |
523b37e3 | 22741 | + RevertFailure("lkup one %pd", a->src_dentry); |
4a4d8108 | 22742 | + return; |
1facf9fc | 22743 | + } |
22744 | + | |
523b37e3 | 22745 | + delegated = NULL; |
4a4d8108 AM |
22746 | + rerr = vfsub_rename(a->dst_h_dir, |
22747 | + au_h_dptr(a->src_dentry, a->btgt), | |
f2c43d5f | 22748 | + a->src_h_dir, &a->h_path, &delegated, a->flags); |
523b37e3 AM |
22749 | + if (unlikely(rerr == -EWOULDBLOCK)) { |
22750 | + pr_warn("cannot retry for NFSv4 delegation" | |
22751 | + " for an internal rename\n"); | |
22752 | + iput(delegated); | |
22753 | + } | |
4a4d8108 AM |
22754 | + d_drop(a->h_path.dentry); |
22755 | + dput(a->h_path.dentry); | |
22756 | + /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */ | |
22757 | + if (rerr) | |
523b37e3 | 22758 | + RevertFailure("rename %pd", a->src_dentry); |
1facf9fc | 22759 | +} |
22760 | + | |
4a4d8108 | 22761 | +static void au_ren_rev_whtmp(int err, struct au_ren_args *a) |
1facf9fc | 22762 | +{ |
4a4d8108 | 22763 | + int rerr; |
523b37e3 | 22764 | + struct inode *delegated; |
dece6358 | 22765 | + |
b4510431 AM |
22766 | + a->h_path.dentry = vfsub_lkup_one(&a->dst_dentry->d_name, |
22767 | + a->dst_h_parent); | |
4a4d8108 AM |
22768 | + rerr = PTR_ERR(a->h_path.dentry); |
22769 | + if (IS_ERR(a->h_path.dentry)) { | |
523b37e3 | 22770 | + RevertFailure("lkup one %pd", a->dst_dentry); |
4a4d8108 AM |
22771 | + return; |
22772 | + } | |
5527c038 | 22773 | + if (d_is_positive(a->h_path.dentry)) { |
4a4d8108 AM |
22774 | + d_drop(a->h_path.dentry); |
22775 | + dput(a->h_path.dentry); | |
22776 | + return; | |
dece6358 AM |
22777 | + } |
22778 | + | |
523b37e3 AM |
22779 | + delegated = NULL; |
22780 | + rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path, | |
f2c43d5f | 22781 | + &delegated, a->flags); |
523b37e3 AM |
22782 | + if (unlikely(rerr == -EWOULDBLOCK)) { |
22783 | + pr_warn("cannot retry for NFSv4 delegation" | |
22784 | + " for an internal rename\n"); | |
22785 | + iput(delegated); | |
22786 | + } | |
4a4d8108 AM |
22787 | + d_drop(a->h_path.dentry); |
22788 | + dput(a->h_path.dentry); | |
22789 | + if (!rerr) | |
22790 | + au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst)); | |
22791 | + else | |
523b37e3 | 22792 | + RevertFailure("rename %pd", a->h_dst); |
4a4d8108 | 22793 | +} |
1308ab2a | 22794 | + |
4a4d8108 AM |
22795 | +static void au_ren_rev_whsrc(int err, struct au_ren_args *a) |
22796 | +{ | |
22797 | + int rerr; | |
1308ab2a | 22798 | + |
4a4d8108 AM |
22799 | + a->h_path.dentry = a->src_wh_dentry; |
22800 | + rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry); | |
027c5e7a | 22801 | + au_set_dbwh(a->src_dentry, a->src_bwh); |
4a4d8108 | 22802 | + if (rerr) |
523b37e3 | 22803 | + RevertFailure("unlink %pd", a->src_wh_dentry); |
4a4d8108 | 22804 | +} |
4a4d8108 | 22805 | +#undef RevertFailure |
1facf9fc | 22806 | + |
1308ab2a | 22807 | +/* ---------------------------------------------------------------------- */ |
22808 | + | |
4a4d8108 AM |
22809 | +/* |
22810 | + * when we have to copyup the renaming entry, do it with the rename-target name | |
22811 | + * in order to minimize the cost (the later actual rename is unnecessary). | |
22812 | + * otherwise rename it on the target branch. | |
22813 | + */ | |
22814 | +static int au_ren_or_cpup(struct au_ren_args *a) | |
1facf9fc | 22815 | +{ |
dece6358 | 22816 | + int err; |
4a4d8108 | 22817 | + struct dentry *d; |
523b37e3 | 22818 | + struct inode *delegated; |
1facf9fc | 22819 | + |
4a4d8108 | 22820 | + d = a->src_dentry; |
5afbbe0d | 22821 | + if (au_dbtop(d) == a->btgt) { |
4a4d8108 | 22822 | + a->h_path.dentry = a->dst_h_dentry; |
5afbbe0d | 22823 | + AuDebugOn(au_dbtop(d) != a->btgt); |
523b37e3 | 22824 | + delegated = NULL; |
4a4d8108 | 22825 | + err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt), |
f2c43d5f AM |
22826 | + a->dst_h_dir, &a->h_path, &delegated, |
22827 | + a->flags); | |
523b37e3 AM |
22828 | + if (unlikely(err == -EWOULDBLOCK)) { |
22829 | + pr_warn("cannot retry for NFSv4 delegation" | |
22830 | + " for an internal rename\n"); | |
22831 | + iput(delegated); | |
22832 | + } | |
c2b27bf2 | 22833 | + } else |
86dc4139 | 22834 | + BUG(); |
1308ab2a | 22835 | + |
027c5e7a AM |
22836 | + if (!err && a->h_dst) |
22837 | + /* it will be set to dinfo later */ | |
22838 | + dget(a->h_dst); | |
1facf9fc | 22839 | + |
dece6358 AM |
22840 | + return err; |
22841 | +} | |
1facf9fc | 22842 | + |
4a4d8108 AM |
22843 | +/* cf. aufs_rmdir() */ |
22844 | +static int au_ren_del_whtmp(struct au_ren_args *a) | |
dece6358 | 22845 | +{ |
4a4d8108 AM |
22846 | + int err; |
22847 | + struct inode *dir; | |
1facf9fc | 22848 | + |
4a4d8108 AM |
22849 | + dir = a->dst_dir; |
22850 | + SiMustAnyLock(dir->i_sb); | |
22851 | + if (!au_nhash_test_longer_wh(&a->whlist, a->btgt, | |
22852 | + au_sbi(dir->i_sb)->si_dirwh) | |
22853 | + || au_test_fs_remote(a->h_dst->d_sb)) { | |
22854 | + err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist); | |
22855 | + if (unlikely(err)) | |
523b37e3 AM |
22856 | + pr_warn("failed removing whtmp dir %pd (%d), " |
22857 | + "ignored.\n", a->h_dst, err); | |
4a4d8108 AM |
22858 | + } else { |
22859 | + au_nhash_wh_free(&a->thargs->whlist); | |
22860 | + a->thargs->whlist = a->whlist; | |
22861 | + a->whlist.nh_num = 0; | |
22862 | + au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs); | |
22863 | + dput(a->h_dst); | |
22864 | + a->thargs = NULL; | |
22865 | + } | |
22866 | + | |
22867 | + return 0; | |
1308ab2a | 22868 | +} |
1facf9fc | 22869 | + |
4a4d8108 | 22870 | +/* make it 'opaque' dir. */ |
f2c43d5f | 22871 | +static int au_ren_do_diropq(struct au_ren_args *a, int idx) |
4a4d8108 AM |
22872 | +{ |
22873 | + int err; | |
f2c43d5f AM |
22874 | + struct dentry *d, *diropq; |
22875 | +#define src_or_dst(member) a->sd[idx].member | |
1facf9fc | 22876 | + |
4a4d8108 | 22877 | + err = 0; |
f2c43d5f AM |
22878 | + d = src_or_dst(dentry); /* {src,dst}_dentry */ |
22879 | + src_or_dst(bdiropq) = au_dbdiropq(d); | |
22880 | + src_or_dst(hinode) = au_hi(src_or_dst(inode), a->btgt); | |
22881 | + au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); | |
22882 | + diropq = au_diropq_create(d, a->btgt); | |
22883 | + au_hn_inode_unlock(src_or_dst(hinode)); | |
4a4d8108 AM |
22884 | + if (IS_ERR(diropq)) |
22885 | + err = PTR_ERR(diropq); | |
076b876e AM |
22886 | + else |
22887 | + dput(diropq); | |
1facf9fc | 22888 | + |
f2c43d5f | 22889 | +#undef src_or_dst_ |
4a4d8108 AM |
22890 | + return err; |
22891 | +} | |
1facf9fc | 22892 | + |
f2c43d5f | 22893 | +static int au_ren_diropq(struct au_ren_args *a) |
4a4d8108 AM |
22894 | +{ |
22895 | + int err; | |
f2c43d5f AM |
22896 | + unsigned char always; |
22897 | + struct dentry *d; | |
1facf9fc | 22898 | + |
f2c43d5f AM |
22899 | + err = 0; |
22900 | + d = a->dst_dentry; /* already renamed on the branch */ | |
22901 | + always = !!au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ); | |
22902 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) | |
8b6a4947 | 22903 | + && !au_ftest_ren(a->auren_flags, DIRREN) |
f2c43d5f AM |
22904 | + && a->btgt != au_dbdiropq(a->src_dentry) |
22905 | + && (a->dst_wh_dentry | |
22906 | + || a->btgt <= au_dbdiropq(d) | |
22907 | + /* hide the lower to keep xino */ | |
22908 | + /* the lowers may not be a dir, but we hide them anyway */ | |
22909 | + || a->btgt < au_dbbot(d) | |
22910 | + || always)) { | |
22911 | + AuDbg("here\n"); | |
22912 | + err = au_ren_do_diropq(a, AuSRC); | |
22913 | + if (unlikely(err)) | |
4a4d8108 | 22914 | + goto out; |
f2c43d5f | 22915 | + au_fset_ren(a->auren_flags, DIROPQ_SRC); |
4a4d8108 | 22916 | + } |
f2c43d5f AM |
22917 | + if (!a->exchange) |
22918 | + goto out; /* success */ | |
1facf9fc | 22919 | + |
f2c43d5f AM |
22920 | + d = a->src_dentry; /* already renamed on the branch */ |
22921 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) | |
22922 | + && a->btgt != au_dbdiropq(a->dst_dentry) | |
22923 | + && (a->btgt < au_dbdiropq(d) | |
22924 | + || a->btgt < au_dbbot(d) | |
22925 | + || always)) { | |
22926 | + AuDbgDentry(a->src_dentry); | |
22927 | + AuDbgDentry(a->dst_dentry); | |
22928 | + err = au_ren_do_diropq(a, AuDST); | |
4a4d8108 | 22929 | + if (unlikely(err)) |
f2c43d5f AM |
22930 | + goto out_rev_src; |
22931 | + au_fset_ren(a->auren_flags, DIROPQ_DST); | |
22932 | + } | |
22933 | + goto out; /* success */ | |
dece6358 | 22934 | + |
f2c43d5f AM |
22935 | +out_rev_src: |
22936 | + AuDbg("err %d, reverting src\n", err); | |
22937 | + au_ren_rev_diropq(err, a); | |
22938 | +out: | |
22939 | + return err; | |
22940 | +} | |
22941 | + | |
22942 | +static int do_rename(struct au_ren_args *a) | |
22943 | +{ | |
22944 | + int err; | |
22945 | + struct dentry *d, *h_d; | |
22946 | + | |
22947 | + if (!a->exchange) { | |
22948 | + /* prepare workqueue args for asynchronous rmdir */ | |
22949 | + h_d = a->dst_h_dentry; | |
22950 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) | |
8b6a4947 | 22951 | + /* && !au_ftest_ren(a->auren_flags, DIRREN) */ |
f2c43d5f AM |
22952 | + && d_is_positive(h_d)) { |
22953 | + err = -ENOMEM; | |
22954 | + a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, | |
22955 | + GFP_NOFS); | |
22956 | + if (unlikely(!a->thargs)) | |
22957 | + goto out; | |
22958 | + a->h_dst = dget(h_d); | |
22959 | + } | |
22960 | + | |
22961 | + /* create whiteout for src_dentry */ | |
22962 | + if (au_ftest_ren(a->auren_flags, WHSRC)) { | |
22963 | + a->src_bwh = au_dbwh(a->src_dentry); | |
22964 | + AuDebugOn(a->src_bwh >= 0); | |
22965 | + a->src_wh_dentry = au_wh_create(a->src_dentry, a->btgt, | |
22966 | + a->src_h_parent); | |
22967 | + err = PTR_ERR(a->src_wh_dentry); | |
22968 | + if (IS_ERR(a->src_wh_dentry)) | |
22969 | + goto out_thargs; | |
22970 | + } | |
22971 | + | |
22972 | + /* lookup whiteout for dentry */ | |
22973 | + if (au_ftest_ren(a->auren_flags, WHDST)) { | |
22974 | + h_d = au_wh_lkup(a->dst_h_parent, | |
22975 | + &a->dst_dentry->d_name, a->br); | |
22976 | + err = PTR_ERR(h_d); | |
22977 | + if (IS_ERR(h_d)) | |
22978 | + goto out_whsrc; | |
22979 | + if (d_is_negative(h_d)) | |
22980 | + dput(h_d); | |
22981 | + else | |
22982 | + a->dst_wh_dentry = h_d; | |
22983 | + } | |
22984 | + | |
22985 | + /* rename dentry to tmpwh */ | |
22986 | + if (a->thargs) { | |
22987 | + err = au_whtmp_ren(a->dst_h_dentry, a->br); | |
22988 | + if (unlikely(err)) | |
22989 | + goto out_whdst; | |
22990 | + | |
22991 | + d = a->dst_dentry; | |
22992 | + au_set_h_dptr(d, a->btgt, NULL); | |
22993 | + err = au_lkup_neg(d, a->btgt, /*wh*/0); | |
22994 | + if (unlikely(err)) | |
22995 | + goto out_whtmp; | |
22996 | + a->dst_h_dentry = au_h_dptr(d, a->btgt); | |
22997 | + } | |
4a4d8108 | 22998 | + } |
1facf9fc | 22999 | + |
5afbbe0d | 23000 | + BUG_ON(d_is_positive(a->dst_h_dentry) && a->src_btop != a->btgt); |
43982f53 | 23001 | +#if 0 /* debugging */ |
8b6a4947 AM |
23002 | + BUG_ON(!au_ftest_ren(a->auren_flags, DIRREN) |
23003 | + && d_is_positive(a->dst_h_dentry) | |
23004 | + && a->src_btop != a->btgt); | |
23005 | +#endif | |
1facf9fc | 23006 | + |
4a4d8108 | 23007 | + /* rename by vfs_rename or cpup */ |
4a4d8108 AM |
23008 | + err = au_ren_or_cpup(a); |
23009 | + if (unlikely(err)) | |
23010 | + /* leave the copied-up one */ | |
23011 | + goto out_whtmp; | |
1308ab2a | 23012 | + |
4a4d8108 | 23013 | + /* make dir opaque */ |
f2c43d5f AM |
23014 | + err = au_ren_diropq(a); |
23015 | + if (unlikely(err)) | |
23016 | + goto out_rename; | |
1308ab2a | 23017 | + |
4a4d8108 | 23018 | + /* update target timestamps */ |
f2c43d5f AM |
23019 | + if (a->exchange) { |
23020 | + AuDebugOn(au_dbtop(a->dst_dentry) != a->btgt); | |
23021 | + a->h_path.dentry = au_h_dptr(a->dst_dentry, a->btgt); | |
23022 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
23023 | + a->dst_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; | |
23024 | + } | |
5afbbe0d | 23025 | + AuDebugOn(au_dbtop(a->src_dentry) != a->btgt); |
4a4d8108 AM |
23026 | + a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt); |
23027 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
5527c038 | 23028 | + a->src_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; |
1facf9fc | 23029 | + |
f2c43d5f AM |
23030 | + if (!a->exchange) { |
23031 | + /* remove whiteout for dentry */ | |
23032 | + if (a->dst_wh_dentry) { | |
23033 | + a->h_path.dentry = a->dst_wh_dentry; | |
23034 | + err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path, | |
23035 | + a->dst_dentry); | |
23036 | + if (unlikely(err)) | |
23037 | + goto out_diropq; | |
23038 | + } | |
1facf9fc | 23039 | + |
f2c43d5f AM |
23040 | + /* remove whtmp */ |
23041 | + if (a->thargs) | |
23042 | + au_ren_del_whtmp(a); /* ignore this error */ | |
1308ab2a | 23043 | + |
f2c43d5f AM |
23044 | + au_fhsm_wrote(a->src_dentry->d_sb, a->btgt, /*force*/0); |
23045 | + } | |
4a4d8108 AM |
23046 | + err = 0; |
23047 | + goto out_success; | |
23048 | + | |
4f0767ce | 23049 | +out_diropq: |
f2c43d5f | 23050 | + au_ren_rev_diropq(err, a); |
4f0767ce | 23051 | +out_rename: |
7e9cd9fe | 23052 | + au_ren_rev_rename(err, a); |
027c5e7a | 23053 | + dput(a->h_dst); |
4f0767ce | 23054 | +out_whtmp: |
4a4d8108 AM |
23055 | + if (a->thargs) |
23056 | + au_ren_rev_whtmp(err, a); | |
4f0767ce | 23057 | +out_whdst: |
4a4d8108 AM |
23058 | + dput(a->dst_wh_dentry); |
23059 | + a->dst_wh_dentry = NULL; | |
4f0767ce | 23060 | +out_whsrc: |
4a4d8108 AM |
23061 | + if (a->src_wh_dentry) |
23062 | + au_ren_rev_whsrc(err, a); | |
4f0767ce | 23063 | +out_success: |
4a4d8108 AM |
23064 | + dput(a->src_wh_dentry); |
23065 | + dput(a->dst_wh_dentry); | |
4f0767ce | 23066 | +out_thargs: |
4a4d8108 AM |
23067 | + if (a->thargs) { |
23068 | + dput(a->h_dst); | |
23069 | + au_whtmp_rmdir_free(a->thargs); | |
23070 | + a->thargs = NULL; | |
23071 | + } | |
4f0767ce | 23072 | +out: |
4a4d8108 | 23073 | + return err; |
dece6358 | 23074 | +} |
1facf9fc | 23075 | + |
1308ab2a | 23076 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23077 | + |
4a4d8108 AM |
23078 | +/* |
23079 | + * test if @dentry dir can be rename destination or not. | |
23080 | + * success means, it is a logically empty dir. | |
23081 | + */ | |
23082 | +static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist) | |
1308ab2a | 23083 | +{ |
4a4d8108 | 23084 | + return au_test_empty(dentry, whlist); |
1308ab2a | 23085 | +} |
1facf9fc | 23086 | + |
4a4d8108 | 23087 | +/* |
8b6a4947 AM |
23088 | + * test if @a->src_dentry dir can be rename source or not. |
23089 | + * if it can, return 0. | |
4a4d8108 AM |
23090 | + * success means, |
23091 | + * - it is a logically empty dir. | |
23092 | + * - or, it exists on writable branch and has no children including whiteouts | |
8b6a4947 | 23093 | + * on the lower branch unless DIRREN is on. |
4a4d8108 | 23094 | + */ |
8b6a4947 | 23095 | +static int may_rename_srcdir(struct au_ren_args *a) |
4a4d8108 AM |
23096 | +{ |
23097 | + int err; | |
23098 | + unsigned int rdhash; | |
8b6a4947 AM |
23099 | + aufs_bindex_t btop, btgt; |
23100 | + struct dentry *dentry; | |
23101 | + struct super_block *sb; | |
23102 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 23103 | + |
8b6a4947 AM |
23104 | + dentry = a->src_dentry; |
23105 | + sb = dentry->d_sb; | |
23106 | + sbinfo = au_sbi(sb); | |
23107 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) | |
23108 | + au_fset_ren(a->auren_flags, DIRREN); | |
23109 | + | |
23110 | + btgt = a->btgt; | |
5afbbe0d AM |
23111 | + btop = au_dbtop(dentry); |
23112 | + if (btop != btgt) { | |
4a4d8108 | 23113 | + struct au_nhash whlist; |
dece6358 | 23114 | + |
8b6a4947 AM |
23115 | + SiMustAnyLock(sb); |
23116 | + rdhash = sbinfo->si_rdhash; | |
4a4d8108 AM |
23117 | + if (!rdhash) |
23118 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, | |
23119 | + dentry)); | |
23120 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
23121 | + if (unlikely(err)) | |
23122 | + goto out; | |
23123 | + err = au_test_empty(dentry, &whlist); | |
23124 | + au_nhash_wh_free(&whlist); | |
23125 | + goto out; | |
23126 | + } | |
dece6358 | 23127 | + |
5afbbe0d | 23128 | + if (btop == au_dbtaildir(dentry)) |
4a4d8108 | 23129 | + return 0; /* success */ |
dece6358 | 23130 | + |
4a4d8108 | 23131 | + err = au_test_empty_lower(dentry); |
1facf9fc | 23132 | + |
4f0767ce | 23133 | +out: |
4a4d8108 | 23134 | + if (err == -ENOTEMPTY) { |
8b6a4947 AM |
23135 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { |
23136 | + err = 0; | |
23137 | + } else { | |
23138 | + AuWarn1("renaming dir who has child(ren) on multiple " | |
23139 | + "branches, is not supported\n"); | |
23140 | + err = -EXDEV; | |
23141 | + } | |
4a4d8108 AM |
23142 | + } |
23143 | + return err; | |
23144 | +} | |
1308ab2a | 23145 | + |
4a4d8108 AM |
23146 | +/* side effect: sets whlist and h_dentry */ |
23147 | +static int au_ren_may_dir(struct au_ren_args *a) | |
1308ab2a | 23148 | +{ |
4a4d8108 AM |
23149 | + int err; |
23150 | + unsigned int rdhash; | |
23151 | + struct dentry *d; | |
1facf9fc | 23152 | + |
4a4d8108 AM |
23153 | + d = a->dst_dentry; |
23154 | + SiMustAnyLock(d->d_sb); | |
1facf9fc | 23155 | + |
4a4d8108 | 23156 | + err = 0; |
f2c43d5f | 23157 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) && a->dst_inode) { |
4a4d8108 AM |
23158 | + rdhash = au_sbi(d->d_sb)->si_rdhash; |
23159 | + if (!rdhash) | |
23160 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d)); | |
23161 | + err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS); | |
23162 | + if (unlikely(err)) | |
23163 | + goto out; | |
1308ab2a | 23164 | + |
f2c43d5f AM |
23165 | + if (!a->exchange) { |
23166 | + au_set_dbtop(d, a->dst_btop); | |
23167 | + err = may_rename_dstdir(d, &a->whlist); | |
23168 | + au_set_dbtop(d, a->btgt); | |
23169 | + } else | |
8b6a4947 | 23170 | + err = may_rename_srcdir(a); |
4a4d8108 | 23171 | + } |
5afbbe0d | 23172 | + a->dst_h_dentry = au_h_dptr(d, au_dbtop(d)); |
4a4d8108 AM |
23173 | + if (unlikely(err)) |
23174 | + goto out; | |
23175 | + | |
23176 | + d = a->src_dentry; | |
5afbbe0d | 23177 | + a->src_h_dentry = au_h_dptr(d, au_dbtop(d)); |
f2c43d5f | 23178 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { |
8b6a4947 | 23179 | + err = may_rename_srcdir(a); |
4a4d8108 AM |
23180 | + if (unlikely(err)) { |
23181 | + au_nhash_wh_free(&a->whlist); | |
23182 | + a->whlist.nh_num = 0; | |
23183 | + } | |
23184 | + } | |
4f0767ce | 23185 | +out: |
4a4d8108 | 23186 | + return err; |
1facf9fc | 23187 | +} |
23188 | + | |
4a4d8108 | 23189 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23190 | + |
4a4d8108 AM |
23191 | +/* |
23192 | + * simple tests for rename. | |
23193 | + * following the checks in vfs, plus the parent-child relationship. | |
23194 | + */ | |
23195 | +static int au_may_ren(struct au_ren_args *a) | |
23196 | +{ | |
23197 | + int err, isdir; | |
23198 | + struct inode *h_inode; | |
1facf9fc | 23199 | + |
5afbbe0d | 23200 | + if (a->src_btop == a->btgt) { |
4a4d8108 | 23201 | + err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent, |
f2c43d5f | 23202 | + au_ftest_ren(a->auren_flags, ISDIR_SRC)); |
4a4d8108 AM |
23203 | + if (unlikely(err)) |
23204 | + goto out; | |
23205 | + err = -EINVAL; | |
23206 | + if (unlikely(a->src_h_dentry == a->h_trap)) | |
23207 | + goto out; | |
23208 | + } | |
1facf9fc | 23209 | + |
4a4d8108 | 23210 | + err = 0; |
5afbbe0d | 23211 | + if (a->dst_btop != a->btgt) |
4a4d8108 | 23212 | + goto out; |
1facf9fc | 23213 | + |
027c5e7a AM |
23214 | + err = -ENOTEMPTY; |
23215 | + if (unlikely(a->dst_h_dentry == a->h_trap)) | |
23216 | + goto out; | |
23217 | + | |
4a4d8108 | 23218 | + err = -EIO; |
f2c43d5f | 23219 | + isdir = !!au_ftest_ren(a->auren_flags, ISDIR_DST); |
5527c038 JR |
23220 | + if (d_really_is_negative(a->dst_dentry)) { |
23221 | + if (d_is_negative(a->dst_h_dentry)) | |
23222 | + err = au_may_add(a->dst_dentry, a->btgt, | |
23223 | + a->dst_h_parent, isdir); | |
4a4d8108 | 23224 | + } else { |
5527c038 | 23225 | + if (unlikely(d_is_negative(a->dst_h_dentry))) |
4a4d8108 | 23226 | + goto out; |
5527c038 JR |
23227 | + h_inode = d_inode(a->dst_h_dentry); |
23228 | + if (h_inode->i_nlink) | |
23229 | + err = au_may_del(a->dst_dentry, a->btgt, | |
23230 | + a->dst_h_parent, isdir); | |
4a4d8108 | 23231 | + } |
1facf9fc | 23232 | + |
4f0767ce | 23233 | +out: |
4a4d8108 AM |
23234 | + if (unlikely(err == -ENOENT || err == -EEXIST)) |
23235 | + err = -EIO; | |
23236 | + AuTraceErr(err); | |
23237 | + return err; | |
23238 | +} | |
1facf9fc | 23239 | + |
1308ab2a | 23240 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23241 | + |
4a4d8108 AM |
23242 | +/* |
23243 | + * locking order | |
23244 | + * (VFS) | |
23245 | + * - src_dir and dir by lock_rename() | |
acd2b654 | 23246 | + * - inode if exists |
4a4d8108 AM |
23247 | + * (aufs) |
23248 | + * - lock all | |
23249 | + * + src_dentry and dentry by aufs_read_and_write_lock2() which calls, | |
23250 | + * + si_read_lock | |
23251 | + * + di_write_lock2_child() | |
23252 | + * + di_write_lock_child() | |
23253 | + * + ii_write_lock_child() | |
23254 | + * + di_write_lock_child2() | |
23255 | + * + ii_write_lock_child2() | |
23256 | + * + src_parent and parent | |
23257 | + * + di_write_lock_parent() | |
23258 | + * + ii_write_lock_parent() | |
23259 | + * + di_write_lock_parent2() | |
23260 | + * + ii_write_lock_parent2() | |
23261 | + * + lower src_dir and dir by vfsub_lock_rename() | |
23262 | + * + verify the every relationships between child and parent. if any | |
23263 | + * of them failed, unlock all and return -EBUSY. | |
23264 | + */ | |
23265 | +static void au_ren_unlock(struct au_ren_args *a) | |
1308ab2a | 23266 | +{ |
4a4d8108 AM |
23267 | + vfsub_unlock_rename(a->src_h_parent, a->src_hdir, |
23268 | + a->dst_h_parent, a->dst_hdir); | |
8b6a4947 AM |
23269 | + if (au_ftest_ren(a->auren_flags, DIRREN) |
23270 | + && a->h_root) | |
23271 | + au_hn_inode_unlock(a->h_root); | |
f2c43d5f | 23272 | + if (au_ftest_ren(a->auren_flags, MNT_WRITE)) |
86dc4139 | 23273 | + vfsub_mnt_drop_write(au_br_mnt(a->br)); |
1308ab2a | 23274 | +} |
23275 | + | |
4a4d8108 | 23276 | +static int au_ren_lock(struct au_ren_args *a) |
1308ab2a | 23277 | +{ |
4a4d8108 AM |
23278 | + int err; |
23279 | + unsigned int udba; | |
1308ab2a | 23280 | + |
4a4d8108 AM |
23281 | + err = 0; |
23282 | + a->src_h_parent = au_h_dptr(a->src_parent, a->btgt); | |
23283 | + a->src_hdir = au_hi(a->src_dir, a->btgt); | |
23284 | + a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt); | |
23285 | + a->dst_hdir = au_hi(a->dst_dir, a->btgt); | |
86dc4139 AM |
23286 | + |
23287 | + err = vfsub_mnt_want_write(au_br_mnt(a->br)); | |
23288 | + if (unlikely(err)) | |
23289 | + goto out; | |
f2c43d5f | 23290 | + au_fset_ren(a->auren_flags, MNT_WRITE); |
8b6a4947 AM |
23291 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { |
23292 | + struct dentry *root; | |
23293 | + struct inode *dir; | |
23294 | + | |
23295 | + /* | |
23296 | + * sbinfo is already locked, so this ii_read_lock is | |
23297 | + * unnecessary. but our debugging feature checks it. | |
23298 | + */ | |
23299 | + root = a->src_inode->i_sb->s_root; | |
23300 | + if (root != a->src_parent && root != a->dst_parent) { | |
23301 | + dir = d_inode(root); | |
23302 | + ii_read_lock_parent3(dir); | |
23303 | + a->h_root = au_hi(dir, a->btgt); | |
23304 | + ii_read_unlock(dir); | |
23305 | + au_hn_inode_lock_nested(a->h_root, AuLsc_I_PARENT3); | |
23306 | + } | |
23307 | + } | |
4a4d8108 AM |
23308 | + a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir, |
23309 | + a->dst_h_parent, a->dst_hdir); | |
23310 | + udba = au_opt_udba(a->src_dentry->d_sb); | |
5527c038 JR |
23311 | + if (unlikely(a->src_hdir->hi_inode != d_inode(a->src_h_parent) |
23312 | + || a->dst_hdir->hi_inode != d_inode(a->dst_h_parent))) | |
4a4d8108 | 23313 | + err = au_busy_or_stale(); |
5afbbe0d | 23314 | + if (!err && au_dbtop(a->src_dentry) == a->btgt) |
4a4d8108 | 23315 | + err = au_h_verify(a->src_h_dentry, udba, |
5527c038 | 23316 | + d_inode(a->src_h_parent), a->src_h_parent, |
4a4d8108 | 23317 | + a->br); |
5afbbe0d | 23318 | + if (!err && au_dbtop(a->dst_dentry) == a->btgt) |
4a4d8108 | 23319 | + err = au_h_verify(a->dst_h_dentry, udba, |
5527c038 | 23320 | + d_inode(a->dst_h_parent), a->dst_h_parent, |
4a4d8108 | 23321 | + a->br); |
86dc4139 | 23322 | + if (!err) |
4a4d8108 | 23323 | + goto out; /* success */ |
4a4d8108 AM |
23324 | + |
23325 | + err = au_busy_or_stale(); | |
4a4d8108 | 23326 | + au_ren_unlock(a); |
86dc4139 | 23327 | + |
4f0767ce | 23328 | +out: |
4a4d8108 | 23329 | + return err; |
1facf9fc | 23330 | +} |
23331 | + | |
23332 | +/* ---------------------------------------------------------------------- */ | |
23333 | + | |
4a4d8108 | 23334 | +static void au_ren_refresh_dir(struct au_ren_args *a) |
1facf9fc | 23335 | +{ |
4a4d8108 | 23336 | + struct inode *dir; |
dece6358 | 23337 | + |
4a4d8108 | 23338 | + dir = a->dst_dir; |
be118d29 | 23339 | + inode_inc_iversion(dir); |
f2c43d5f | 23340 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { |
4a4d8108 AM |
23341 | + /* is this updating defined in POSIX? */ |
23342 | + au_cpup_attr_timesizes(a->src_inode); | |
23343 | + au_cpup_attr_nlink(dir, /*force*/1); | |
4a4d8108 | 23344 | + } |
b912730e | 23345 | + au_dir_ts(dir, a->btgt); |
dece6358 | 23346 | + |
f2c43d5f AM |
23347 | + if (a->exchange) { |
23348 | + dir = a->src_dir; | |
be118d29 | 23349 | + inode_inc_iversion(dir); |
f2c43d5f AM |
23350 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST)) { |
23351 | + /* is this updating defined in POSIX? */ | |
23352 | + au_cpup_attr_timesizes(a->dst_inode); | |
23353 | + au_cpup_attr_nlink(dir, /*force*/1); | |
23354 | + } | |
23355 | + au_dir_ts(dir, a->btgt); | |
23356 | + } | |
23357 | + | |
23358 | + if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) | |
4a4d8108 | 23359 | + return; |
dece6358 | 23360 | + |
4a4d8108 | 23361 | + dir = a->src_dir; |
be118d29 | 23362 | + inode_inc_iversion(dir); |
f2c43d5f | 23363 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) |
4a4d8108 | 23364 | + au_cpup_attr_nlink(dir, /*force*/1); |
b912730e | 23365 | + au_dir_ts(dir, a->btgt); |
1facf9fc | 23366 | +} |
23367 | + | |
4a4d8108 | 23368 | +static void au_ren_refresh(struct au_ren_args *a) |
1facf9fc | 23369 | +{ |
5afbbe0d | 23370 | + aufs_bindex_t bbot, bindex; |
4a4d8108 AM |
23371 | + struct dentry *d, *h_d; |
23372 | + struct inode *i, *h_i; | |
23373 | + struct super_block *sb; | |
dece6358 | 23374 | + |
027c5e7a AM |
23375 | + d = a->dst_dentry; |
23376 | + d_drop(d); | |
23377 | + if (a->h_dst) | |
23378 | + /* already dget-ed by au_ren_or_cpup() */ | |
23379 | + au_set_h_dptr(d, a->btgt, a->h_dst); | |
23380 | + | |
23381 | + i = a->dst_inode; | |
23382 | + if (i) { | |
f2c43d5f AM |
23383 | + if (!a->exchange) { |
23384 | + if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) | |
23385 | + vfsub_drop_nlink(i); | |
23386 | + else { | |
23387 | + vfsub_dead_dir(i); | |
23388 | + au_cpup_attr_timesizes(i); | |
23389 | + } | |
23390 | + au_update_dbrange(d, /*do_put_zero*/1); | |
23391 | + } else | |
23392 | + au_cpup_attr_nlink(i, /*force*/1); | |
027c5e7a | 23393 | + } else { |
5afbbe0d AM |
23394 | + bbot = a->btgt; |
23395 | + for (bindex = au_dbtop(d); bindex < bbot; bindex++) | |
027c5e7a | 23396 | + au_set_h_dptr(d, bindex, NULL); |
5afbbe0d AM |
23397 | + bbot = au_dbbot(d); |
23398 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) | |
027c5e7a AM |
23399 | + au_set_h_dptr(d, bindex, NULL); |
23400 | + au_update_dbrange(d, /*do_put_zero*/0); | |
23401 | + } | |
23402 | + | |
8b6a4947 AM |
23403 | + if (a->exchange |
23404 | + || au_ftest_ren(a->auren_flags, DIRREN)) { | |
23405 | + d_drop(a->src_dentry); | |
23406 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23407 | + au_set_dbwh(a->src_dentry, -1); | |
23408 | + return; | |
23409 | + } | |
23410 | + | |
4a4d8108 | 23411 | + d = a->src_dentry; |
8b6a4947 AM |
23412 | + au_set_dbwh(d, -1); |
23413 | + bbot = au_dbbot(d); | |
23414 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { | |
23415 | + h_d = au_h_dptr(d, bindex); | |
23416 | + if (h_d) | |
23417 | + au_set_h_dptr(d, bindex, NULL); | |
23418 | + } | |
23419 | + au_set_dbbot(d, a->btgt); | |
4a4d8108 | 23420 | + |
8b6a4947 AM |
23421 | + sb = d->d_sb; |
23422 | + i = a->src_inode; | |
23423 | + if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i)) | |
23424 | + return; /* success */ | |
4a4d8108 | 23425 | + |
8b6a4947 AM |
23426 | + bbot = au_ibbot(i); |
23427 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { | |
23428 | + h_i = au_h_iptr(i, bindex); | |
23429 | + if (h_i) { | |
23430 | + au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0); | |
23431 | + /* ignore this error */ | |
23432 | + au_set_h_iptr(i, bindex, NULL, 0); | |
4a4d8108 AM |
23433 | + } |
23434 | + } | |
8b6a4947 | 23435 | + au_set_ibbot(i, a->btgt); |
1308ab2a | 23436 | +} |
dece6358 | 23437 | + |
4a4d8108 AM |
23438 | +/* ---------------------------------------------------------------------- */ |
23439 | + | |
23440 | +/* mainly for link(2) and rename(2) */ | |
23441 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt) | |
1308ab2a | 23442 | +{ |
4a4d8108 AM |
23443 | + aufs_bindex_t bdiropq, bwh; |
23444 | + struct dentry *parent; | |
23445 | + struct au_branch *br; | |
23446 | + | |
23447 | + parent = dentry->d_parent; | |
5527c038 | 23448 | + IMustLock(d_inode(parent)); /* dir is locked */ |
4a4d8108 AM |
23449 | + |
23450 | + bdiropq = au_dbdiropq(parent); | |
23451 | + bwh = au_dbwh(dentry); | |
23452 | + br = au_sbr(dentry->d_sb, btgt); | |
23453 | + if (au_br_rdonly(br) | |
23454 | + || (0 <= bdiropq && bdiropq < btgt) | |
23455 | + || (0 <= bwh && bwh < btgt)) | |
23456 | + btgt = -1; | |
23457 | + | |
23458 | + AuDbg("btgt %d\n", btgt); | |
23459 | + return btgt; | |
1facf9fc | 23460 | +} |
23461 | + | |
5afbbe0d | 23462 | +/* sets src_btop, dst_btop and btgt */ |
4a4d8108 | 23463 | +static int au_ren_wbr(struct au_ren_args *a) |
1facf9fc | 23464 | +{ |
4a4d8108 AM |
23465 | + int err; |
23466 | + struct au_wr_dir_args wr_dir_args = { | |
23467 | + /* .force_btgt = -1, */ | |
23468 | + .flags = AuWrDir_ADD_ENTRY | |
23469 | + }; | |
dece6358 | 23470 | + |
5afbbe0d AM |
23471 | + a->src_btop = au_dbtop(a->src_dentry); |
23472 | + a->dst_btop = au_dbtop(a->dst_dentry); | |
f2c43d5f AM |
23473 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) |
23474 | + || au_ftest_ren(a->auren_flags, ISDIR_DST)) | |
4a4d8108 | 23475 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); |
5afbbe0d AM |
23476 | + wr_dir_args.force_btgt = a->src_btop; |
23477 | + if (a->dst_inode && a->dst_btop < a->src_btop) | |
23478 | + wr_dir_args.force_btgt = a->dst_btop; | |
4a4d8108 AM |
23479 | + wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt); |
23480 | + err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args); | |
23481 | + a->btgt = err; | |
f2c43d5f AM |
23482 | + if (a->exchange) |
23483 | + au_update_dbtop(a->dst_dentry); | |
dece6358 | 23484 | + |
4a4d8108 | 23485 | + return err; |
1facf9fc | 23486 | +} |
23487 | + | |
4a4d8108 | 23488 | +static void au_ren_dt(struct au_ren_args *a) |
1facf9fc | 23489 | +{ |
4a4d8108 AM |
23490 | + a->h_path.dentry = a->src_h_parent; |
23491 | + au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path); | |
f2c43d5f | 23492 | + if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) { |
4a4d8108 AM |
23493 | + a->h_path.dentry = a->dst_h_parent; |
23494 | + au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path); | |
23495 | + } | |
1facf9fc | 23496 | + |
f2c43d5f AM |
23497 | + au_fclr_ren(a->auren_flags, DT_DSTDIR); |
23498 | + if (!au_ftest_ren(a->auren_flags, ISDIR_SRC) | |
23499 | + && !a->exchange) | |
4a4d8108 | 23500 | + return; |
dece6358 | 23501 | + |
4a4d8108 AM |
23502 | + a->h_path.dentry = a->src_h_dentry; |
23503 | + au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path); | |
5527c038 | 23504 | + if (d_is_positive(a->dst_h_dentry)) { |
f2c43d5f | 23505 | + au_fset_ren(a->auren_flags, DT_DSTDIR); |
4a4d8108 AM |
23506 | + a->h_path.dentry = a->dst_h_dentry; |
23507 | + au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path); | |
23508 | + } | |
1308ab2a | 23509 | +} |
dece6358 | 23510 | + |
4a4d8108 | 23511 | +static void au_ren_rev_dt(int err, struct au_ren_args *a) |
1308ab2a | 23512 | +{ |
4a4d8108 | 23513 | + struct dentry *h_d; |
febd17d6 | 23514 | + struct inode *h_inode; |
4a4d8108 AM |
23515 | + |
23516 | + au_dtime_revert(a->src_dt + AuPARENT); | |
f2c43d5f | 23517 | + if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) |
4a4d8108 AM |
23518 | + au_dtime_revert(a->dst_dt + AuPARENT); |
23519 | + | |
f2c43d5f | 23520 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) && err != -EIO) { |
4a4d8108 | 23521 | + h_d = a->src_dt[AuCHILD].dt_h_path.dentry; |
febd17d6 JR |
23522 | + h_inode = d_inode(h_d); |
23523 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); | |
4a4d8108 | 23524 | + au_dtime_revert(a->src_dt + AuCHILD); |
febd17d6 | 23525 | + inode_unlock(h_inode); |
4a4d8108 | 23526 | + |
f2c43d5f | 23527 | + if (au_ftest_ren(a->auren_flags, DT_DSTDIR)) { |
4a4d8108 | 23528 | + h_d = a->dst_dt[AuCHILD].dt_h_path.dentry; |
febd17d6 JR |
23529 | + h_inode = d_inode(h_d); |
23530 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); | |
4a4d8108 | 23531 | + au_dtime_revert(a->dst_dt + AuCHILD); |
febd17d6 | 23532 | + inode_unlock(h_inode); |
1facf9fc | 23533 | + } |
23534 | + } | |
23535 | +} | |
23536 | + | |
4a4d8108 AM |
23537 | +/* ---------------------------------------------------------------------- */ |
23538 | + | |
23539 | +int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry, | |
f2c43d5f AM |
23540 | + struct inode *_dst_dir, struct dentry *_dst_dentry, |
23541 | + unsigned int _flags) | |
1facf9fc | 23542 | +{ |
f2c43d5f | 23543 | + int err, lock_flags; |
8b6a4947 | 23544 | + void *rev; |
4a4d8108 AM |
23545 | + /* reduce stack space */ |
23546 | + struct au_ren_args *a; | |
f2c43d5f | 23547 | + struct au_pin pin; |
4a4d8108 | 23548 | + |
f2c43d5f | 23549 | + AuDbg("%pd, %pd, 0x%x\n", _src_dentry, _dst_dentry, _flags); |
4a4d8108 AM |
23550 | + IMustLock(_src_dir); |
23551 | + IMustLock(_dst_dir); | |
23552 | + | |
f2c43d5f AM |
23553 | + err = -EINVAL; |
23554 | + if (unlikely(_flags & RENAME_WHITEOUT)) | |
23555 | + goto out; | |
23556 | + | |
4a4d8108 AM |
23557 | + err = -ENOMEM; |
23558 | + BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE); | |
23559 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
23560 | + if (unlikely(!a)) | |
23561 | + goto out; | |
23562 | + | |
f2c43d5f | 23563 | + a->flags = _flags; |
acd2b654 AM |
23564 | + BUILD_BUG_ON(sizeof(a->exchange) == sizeof(u8) |
23565 | + && RENAME_EXCHANGE > U8_MAX); | |
f2c43d5f | 23566 | + a->exchange = _flags & RENAME_EXCHANGE; |
4a4d8108 AM |
23567 | + a->src_dir = _src_dir; |
23568 | + a->src_dentry = _src_dentry; | |
5527c038 JR |
23569 | + a->src_inode = NULL; |
23570 | + if (d_really_is_positive(a->src_dentry)) | |
23571 | + a->src_inode = d_inode(a->src_dentry); | |
4a4d8108 AM |
23572 | + a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */ |
23573 | + a->dst_dir = _dst_dir; | |
23574 | + a->dst_dentry = _dst_dentry; | |
5527c038 JR |
23575 | + a->dst_inode = NULL; |
23576 | + if (d_really_is_positive(a->dst_dentry)) | |
23577 | + a->dst_inode = d_inode(a->dst_dentry); | |
4a4d8108 AM |
23578 | + a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */ |
23579 | + if (a->dst_inode) { | |
f2c43d5f AM |
23580 | + /* |
23581 | + * if EXCHANGE && src is non-dir && dst is dir, | |
23582 | + * dst is not locked. | |
23583 | + */ | |
23584 | + /* IMustLock(a->dst_inode); */ | |
4a4d8108 | 23585 | + au_igrab(a->dst_inode); |
1facf9fc | 23586 | + } |
1facf9fc | 23587 | + |
4a4d8108 | 23588 | + err = -ENOTDIR; |
f2c43d5f | 23589 | + lock_flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN; |
2000de60 | 23590 | + if (d_is_dir(a->src_dentry)) { |
f2c43d5f AM |
23591 | + au_fset_ren(a->auren_flags, ISDIR_SRC); |
23592 | + if (unlikely(!a->exchange | |
23593 | + && d_really_is_positive(a->dst_dentry) | |
2000de60 | 23594 | + && !d_is_dir(a->dst_dentry))) |
4a4d8108 | 23595 | + goto out_free; |
f2c43d5f AM |
23596 | + lock_flags |= AuLock_DIRS; |
23597 | + } | |
23598 | + if (a->dst_inode && d_is_dir(a->dst_dentry)) { | |
23599 | + au_fset_ren(a->auren_flags, ISDIR_DST); | |
23600 | + if (unlikely(!a->exchange | |
23601 | + && d_really_is_positive(a->src_dentry) | |
23602 | + && !d_is_dir(a->src_dentry))) | |
23603 | + goto out_free; | |
23604 | + lock_flags |= AuLock_DIRS; | |
b95c5147 | 23605 | + } |
8b6a4947 AM |
23606 | + err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
23607 | + lock_flags); | |
e49829fe JR |
23608 | + if (unlikely(err)) |
23609 | + goto out_free; | |
1facf9fc | 23610 | + |
027c5e7a AM |
23611 | + err = au_d_hashed_positive(a->src_dentry); |
23612 | + if (unlikely(err)) | |
23613 | + goto out_unlock; | |
23614 | + err = -ENOENT; | |
23615 | + if (a->dst_inode) { | |
23616 | + /* | |
f2c43d5f | 23617 | + * If it is a dir, VFS unhash it before this |
027c5e7a AM |
23618 | + * function. It means we cannot rely upon d_unhashed(). |
23619 | + */ | |
23620 | + if (unlikely(!a->dst_inode->i_nlink)) | |
23621 | + goto out_unlock; | |
f2c43d5f | 23622 | + if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) { |
027c5e7a | 23623 | + err = au_d_hashed_positive(a->dst_dentry); |
f2c43d5f | 23624 | + if (unlikely(err && !a->exchange)) |
027c5e7a AM |
23625 | + goto out_unlock; |
23626 | + } else if (unlikely(IS_DEADDIR(a->dst_inode))) | |
23627 | + goto out_unlock; | |
23628 | + } else if (unlikely(d_unhashed(a->dst_dentry))) | |
23629 | + goto out_unlock; | |
23630 | + | |
7eafdf33 AM |
23631 | + /* |
23632 | + * is it possible? | |
79b8bda9 | 23633 | + * yes, it happened (in linux-3.3-rcN) but I don't know why. |
7eafdf33 AM |
23634 | + * there may exist a problem somewhere else. |
23635 | + */ | |
23636 | + err = -EINVAL; | |
5527c038 | 23637 | + if (unlikely(d_inode(a->dst_parent) == d_inode(a->src_dentry))) |
7eafdf33 AM |
23638 | + goto out_unlock; |
23639 | + | |
f2c43d5f | 23640 | + au_fset_ren(a->auren_flags, ISSAMEDIR); /* temporary */ |
4a4d8108 | 23641 | + di_write_lock_parent(a->dst_parent); |
1facf9fc | 23642 | + |
4a4d8108 AM |
23643 | + /* which branch we process */ |
23644 | + err = au_ren_wbr(a); | |
23645 | + if (unlikely(err < 0)) | |
027c5e7a | 23646 | + goto out_parent; |
4a4d8108 | 23647 | + a->br = au_sbr(a->dst_dentry->d_sb, a->btgt); |
86dc4139 | 23648 | + a->h_path.mnt = au_br_mnt(a->br); |
1facf9fc | 23649 | + |
4a4d8108 AM |
23650 | + /* are they available to be renamed */ |
23651 | + err = au_ren_may_dir(a); | |
23652 | + if (unlikely(err)) | |
23653 | + goto out_children; | |
1facf9fc | 23654 | + |
4a4d8108 | 23655 | + /* prepare the writable parent dir on the same branch */ |
5afbbe0d | 23656 | + if (a->dst_btop == a->btgt) { |
f2c43d5f | 23657 | + au_fset_ren(a->auren_flags, WHDST); |
4a4d8108 AM |
23658 | + } else { |
23659 | + err = au_cpup_dirs(a->dst_dentry, a->btgt); | |
23660 | + if (unlikely(err)) | |
23661 | + goto out_children; | |
23662 | + } | |
1facf9fc | 23663 | + |
f2c43d5f AM |
23664 | + err = 0; |
23665 | + if (!a->exchange) { | |
23666 | + if (a->src_dir != a->dst_dir) { | |
23667 | + /* | |
23668 | + * this temporary unlock is safe, | |
23669 | + * because both dir->i_mutex are locked. | |
23670 | + */ | |
23671 | + di_write_unlock(a->dst_parent); | |
23672 | + di_write_lock_parent(a->src_parent); | |
23673 | + err = au_wr_dir_need_wh(a->src_dentry, | |
23674 | + au_ftest_ren(a->auren_flags, | |
23675 | + ISDIR_SRC), | |
23676 | + &a->btgt); | |
23677 | + di_write_unlock(a->src_parent); | |
23678 | + di_write_lock2_parent(a->src_parent, a->dst_parent, | |
23679 | + /*isdir*/1); | |
23680 | + au_fclr_ren(a->auren_flags, ISSAMEDIR); | |
23681 | + } else | |
23682 | + err = au_wr_dir_need_wh(a->src_dentry, | |
23683 | + au_ftest_ren(a->auren_flags, | |
23684 | + ISDIR_SRC), | |
23685 | + &a->btgt); | |
23686 | + } | |
4a4d8108 AM |
23687 | + if (unlikely(err < 0)) |
23688 | + goto out_children; | |
23689 | + if (err) | |
f2c43d5f | 23690 | + au_fset_ren(a->auren_flags, WHSRC); |
1facf9fc | 23691 | + |
86dc4139 | 23692 | + /* cpup src */ |
5afbbe0d | 23693 | + if (a->src_btop != a->btgt) { |
86dc4139 AM |
23694 | + err = au_pin(&pin, a->src_dentry, a->btgt, |
23695 | + au_opt_udba(a->src_dentry->d_sb), | |
23696 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
367653fa | 23697 | + if (!err) { |
c2b27bf2 AM |
23698 | + struct au_cp_generic cpg = { |
23699 | + .dentry = a->src_dentry, | |
23700 | + .bdst = a->btgt, | |
5afbbe0d | 23701 | + .bsrc = a->src_btop, |
c2b27bf2 AM |
23702 | + .len = -1, |
23703 | + .pin = &pin, | |
23704 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
23705 | + }; | |
5afbbe0d | 23706 | + AuDebugOn(au_dbtop(a->src_dentry) != a->src_btop); |
c2b27bf2 | 23707 | + err = au_sio_cpup_simple(&cpg); |
367653fa | 23708 | + au_unpin(&pin); |
86dc4139 | 23709 | + } |
86dc4139 AM |
23710 | + if (unlikely(err)) |
23711 | + goto out_children; | |
5afbbe0d | 23712 | + a->src_btop = a->btgt; |
86dc4139 | 23713 | + a->src_h_dentry = au_h_dptr(a->src_dentry, a->btgt); |
f2c43d5f AM |
23714 | + if (!a->exchange) |
23715 | + au_fset_ren(a->auren_flags, WHSRC); | |
23716 | + } | |
23717 | + | |
23718 | + /* cpup dst */ | |
23719 | + if (a->exchange && a->dst_inode | |
23720 | + && a->dst_btop != a->btgt) { | |
23721 | + err = au_pin(&pin, a->dst_dentry, a->btgt, | |
23722 | + au_opt_udba(a->dst_dentry->d_sb), | |
23723 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
23724 | + if (!err) { | |
23725 | + struct au_cp_generic cpg = { | |
23726 | + .dentry = a->dst_dentry, | |
23727 | + .bdst = a->btgt, | |
23728 | + .bsrc = a->dst_btop, | |
23729 | + .len = -1, | |
23730 | + .pin = &pin, | |
23731 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
23732 | + }; | |
23733 | + err = au_sio_cpup_simple(&cpg); | |
23734 | + au_unpin(&pin); | |
23735 | + } | |
23736 | + if (unlikely(err)) | |
23737 | + goto out_children; | |
23738 | + a->dst_btop = a->btgt; | |
23739 | + a->dst_h_dentry = au_h_dptr(a->dst_dentry, a->btgt); | |
86dc4139 AM |
23740 | + } |
23741 | + | |
4a4d8108 AM |
23742 | + /* lock them all */ |
23743 | + err = au_ren_lock(a); | |
23744 | + if (unlikely(err)) | |
86dc4139 | 23745 | + /* leave the copied-up one */ |
4a4d8108 | 23746 | + goto out_children; |
1facf9fc | 23747 | + |
f2c43d5f AM |
23748 | + if (!a->exchange) { |
23749 | + if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE)) | |
23750 | + err = au_may_ren(a); | |
23751 | + else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
23752 | + err = -ENAMETOOLONG; | |
23753 | + if (unlikely(err)) | |
23754 | + goto out_hdir; | |
23755 | + } | |
1facf9fc | 23756 | + |
4a4d8108 AM |
23757 | + /* store timestamps to be revertible */ |
23758 | + au_ren_dt(a); | |
1facf9fc | 23759 | + |
8b6a4947 AM |
23760 | + /* store dirren info */ |
23761 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { | |
23762 | + err = au_dr_rename(a->src_dentry, a->btgt, | |
23763 | + &a->dst_dentry->d_name, &rev); | |
23764 | + AuTraceErr(err); | |
23765 | + if (unlikely(err)) | |
23766 | + goto out_dt; | |
23767 | + } | |
23768 | + | |
4a4d8108 AM |
23769 | + /* here we go */ |
23770 | + err = do_rename(a); | |
23771 | + if (unlikely(err)) | |
8b6a4947 AM |
23772 | + goto out_dirren; |
23773 | + | |
23774 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23775 | + au_dr_rename_fin(a->src_dentry, a->btgt, rev); | |
4a4d8108 AM |
23776 | + |
23777 | + /* update dir attributes */ | |
23778 | + au_ren_refresh_dir(a); | |
23779 | + | |
23780 | + /* dput/iput all lower dentries */ | |
23781 | + au_ren_refresh(a); | |
23782 | + | |
23783 | + goto out_hdir; /* success */ | |
23784 | + | |
8b6a4947 AM |
23785 | +out_dirren: |
23786 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23787 | + au_dr_rename_rev(a->src_dentry, a->btgt, rev); | |
4f0767ce | 23788 | +out_dt: |
4a4d8108 | 23789 | + au_ren_rev_dt(err, a); |
4f0767ce | 23790 | +out_hdir: |
4a4d8108 | 23791 | + au_ren_unlock(a); |
4f0767ce | 23792 | +out_children: |
4a4d8108 | 23793 | + au_nhash_wh_free(&a->whlist); |
5afbbe0d AM |
23794 | + if (err && a->dst_inode && a->dst_btop != a->btgt) { |
23795 | + AuDbg("btop %d, btgt %d\n", a->dst_btop, a->btgt); | |
027c5e7a | 23796 | + au_set_h_dptr(a->dst_dentry, a->btgt, NULL); |
5afbbe0d | 23797 | + au_set_dbtop(a->dst_dentry, a->dst_btop); |
4a4d8108 | 23798 | + } |
027c5e7a | 23799 | +out_parent: |
f2c43d5f | 23800 | + if (!err) { |
8b6a4947 AM |
23801 | + if (d_unhashed(a->src_dentry)) |
23802 | + au_fset_ren(a->auren_flags, DROPPED_SRC); | |
23803 | + if (d_unhashed(a->dst_dentry)) | |
23804 | + au_fset_ren(a->auren_flags, DROPPED_DST); | |
f2c43d5f AM |
23805 | + if (!a->exchange) |
23806 | + d_move(a->src_dentry, a->dst_dentry); | |
8b6a4947 | 23807 | + else { |
f2c43d5f | 23808 | + d_exchange(a->src_dentry, a->dst_dentry); |
8b6a4947 AM |
23809 | + if (au_ftest_ren(a->auren_flags, DROPPED_DST)) |
23810 | + d_drop(a->dst_dentry); | |
23811 | + } | |
23812 | + if (au_ftest_ren(a->auren_flags, DROPPED_SRC)) | |
23813 | + d_drop(a->src_dentry); | |
f2c43d5f | 23814 | + } else { |
5afbbe0d | 23815 | + au_update_dbtop(a->dst_dentry); |
027c5e7a AM |
23816 | + if (!a->dst_inode) |
23817 | + d_drop(a->dst_dentry); | |
23818 | + } | |
f2c43d5f | 23819 | + if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) |
4a4d8108 AM |
23820 | + di_write_unlock(a->dst_parent); |
23821 | + else | |
23822 | + di_write_unlock2(a->src_parent, a->dst_parent); | |
027c5e7a | 23823 | +out_unlock: |
4a4d8108 | 23824 | + aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry); |
4f0767ce | 23825 | +out_free: |
4a4d8108 AM |
23826 | + iput(a->dst_inode); |
23827 | + if (a->thargs) | |
23828 | + au_whtmp_rmdir_free(a->thargs); | |
9f237c51 | 23829 | + au_kfree_rcu(a); |
4f0767ce | 23830 | +out: |
4a4d8108 AM |
23831 | + AuTraceErr(err); |
23832 | + return err; | |
1308ab2a | 23833 | +} |
7f207e10 | 23834 | diff -urN /usr/share/empty/fs/aufs/Kconfig linux/fs/aufs/Kconfig |
eca34b5c AM |
23835 | --- /usr/share/empty/fs/aufs/Kconfig 1970-01-01 01:00:00.000000000 +0100 |
23836 | +++ linux/fs/aufs/Kconfig 2019-07-11 15:42:14.458904362 +0200 | |
2121bcd9 AM |
23837 | @@ -0,0 +1,199 @@ |
23838 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
23839 | +config AUFS_FS |
23840 | + tristate "Aufs (Advanced multi layered unification filesystem) support" | |
4a4d8108 AM |
23841 | + help |
23842 | + Aufs is a stackable unification filesystem such as Unionfs, | |
23843 | + which unifies several directories and provides a merged single | |
23844 | + directory. | |
23845 | + In the early days, aufs was entirely re-designed and | |
23846 | + re-implemented Unionfs Version 1.x series. Introducing many | |
23847 | + original ideas, approaches and improvements, it becomes totally | |
23848 | + different from Unionfs while keeping the basic features. | |
1facf9fc | 23849 | + |
4a4d8108 AM |
23850 | +if AUFS_FS |
23851 | +choice | |
23852 | + prompt "Maximum number of branches" | |
23853 | + default AUFS_BRANCH_MAX_127 | |
23854 | + help | |
23855 | + Specifies the maximum number of branches (or member directories) | |
23856 | + in a single aufs. The larger value consumes more system | |
23857 | + resources and has a minor impact to performance. | |
23858 | +config AUFS_BRANCH_MAX_127 | |
23859 | + bool "127" | |
23860 | + help | |
23861 | + Specifies the maximum number of branches (or member directories) | |
23862 | + in a single aufs. The larger value consumes more system | |
23863 | + resources and has a minor impact to performance. | |
23864 | +config AUFS_BRANCH_MAX_511 | |
23865 | + bool "511" | |
23866 | + help | |
23867 | + Specifies the maximum number of branches (or member directories) | |
23868 | + in a single aufs. The larger value consumes more system | |
23869 | + resources and has a minor impact to performance. | |
23870 | +config AUFS_BRANCH_MAX_1023 | |
23871 | + bool "1023" | |
23872 | + help | |
23873 | + Specifies the maximum number of branches (or member directories) | |
23874 | + in a single aufs. The larger value consumes more system | |
23875 | + resources and has a minor impact to performance. | |
23876 | +config AUFS_BRANCH_MAX_32767 | |
23877 | + bool "32767" | |
23878 | + help | |
23879 | + Specifies the maximum number of branches (or member directories) | |
23880 | + in a single aufs. The larger value consumes more system | |
23881 | + resources and has a minor impact to performance. | |
23882 | +endchoice | |
1facf9fc | 23883 | + |
e49829fe JR |
23884 | +config AUFS_SBILIST |
23885 | + bool | |
23886 | + depends on AUFS_MAGIC_SYSRQ || PROC_FS | |
23887 | + default y | |
23888 | + help | |
23889 | + Automatic configuration for internal use. | |
23890 | + When aufs supports Magic SysRq or /proc, enabled automatically. | |
23891 | + | |
4a4d8108 AM |
23892 | +config AUFS_HNOTIFY |
23893 | + bool "Detect direct branch access (bypassing aufs)" | |
23894 | + help | |
23895 | + If you want to modify files on branches directly, eg. bypassing aufs, | |
23896 | + and want aufs to detect the changes of them fully, then enable this | |
23897 | + option and use 'udba=notify' mount option. | |
7f207e10 | 23898 | + Currently there is only one available configuration, "fsnotify". |
4a4d8108 AM |
23899 | + It will have a negative impact to the performance. |
23900 | + See detail in aufs.5. | |
dece6358 | 23901 | + |
4a4d8108 AM |
23902 | +choice |
23903 | + prompt "method" if AUFS_HNOTIFY | |
23904 | + default AUFS_HFSNOTIFY | |
23905 | +config AUFS_HFSNOTIFY | |
23906 | + bool "fsnotify" | |
23907 | + select FSNOTIFY | |
4a4d8108 | 23908 | +endchoice |
1facf9fc | 23909 | + |
4a4d8108 AM |
23910 | +config AUFS_EXPORT |
23911 | + bool "NFS-exportable aufs" | |
2cbb1c4b | 23912 | + depends on EXPORTFS |
4a4d8108 AM |
23913 | + help |
23914 | + If you want to export your mounted aufs via NFS, then enable this | |
23915 | + option. There are several requirements for this configuration. | |
23916 | + See detail in aufs.5. | |
1facf9fc | 23917 | + |
4a4d8108 AM |
23918 | +config AUFS_INO_T_64 |
23919 | + bool | |
23920 | + depends on AUFS_EXPORT | |
23921 | + depends on 64BIT && !(ALPHA || S390) | |
23922 | + default y | |
23923 | + help | |
23924 | + Automatic configuration for internal use. | |
23925 | + /* typedef unsigned long/int __kernel_ino_t */ | |
23926 | + /* alpha and s390x are int */ | |
1facf9fc | 23927 | + |
c1595e42 JR |
23928 | +config AUFS_XATTR |
23929 | + bool "support for XATTR/EA (including Security Labels)" | |
23930 | + help | |
23931 | + If your branch fs supports XATTR/EA and you want to make them | |
23932 | + available in aufs too, then enable this opsion and specify the | |
23933 | + branch attributes for EA. | |
23934 | + See detail in aufs.5. | |
23935 | + | |
076b876e AM |
23936 | +config AUFS_FHSM |
23937 | + bool "File-based Hierarchical Storage Management" | |
23938 | + help | |
23939 | + Hierarchical Storage Management (or HSM) is a well-known feature | |
23940 | + in the storage world. Aufs provides this feature as file-based. | |
23941 | + with multiple branches. | |
23942 | + These multiple branches are prioritized, ie. the topmost one | |
23943 | + should be the fastest drive and be used heavily. | |
23944 | + | |
4a4d8108 AM |
23945 | +config AUFS_RDU |
23946 | + bool "Readdir in userspace" | |
23947 | + help | |
23948 | + Aufs has two methods to provide a merged view for a directory, | |
23949 | + by a user-space library and by kernel-space natively. The latter | |
23950 | + is always enabled but sometimes large and slow. | |
23951 | + If you enable this option, install the library in aufs2-util | |
23952 | + package, and set some environment variables for your readdir(3), | |
23953 | + then the work will be handled in user-space which generally | |
23954 | + shows better performance in most cases. | |
23955 | + See detail in aufs.5. | |
1facf9fc | 23956 | + |
8b6a4947 AM |
23957 | +config AUFS_DIRREN |
23958 | + bool "Workaround for rename(2)-ing a directory" | |
23959 | + help | |
23960 | + By default, aufs returns EXDEV error in renameing a dir who has | |
23961 | + his child on the lower branch, since it is a bad idea to issue | |
23962 | + rename(2) internally for every lower branch. But user may not | |
23963 | + accept this behaviour. So here is a workaround to allow such | |
23964 | + rename(2) and store some extra infromation on the writable | |
23965 | + branch. Obviously this costs high (and I don't like it). | |
23966 | + To use this feature, you need to enable this configuration AND | |
23967 | + to specify the mount option `dirren.' | |
23968 | + See details in aufs.5 and the design documents. | |
23969 | + | |
4a4d8108 AM |
23970 | +config AUFS_SHWH |
23971 | + bool "Show whiteouts" | |
23972 | + help | |
23973 | + If you want to make the whiteouts in aufs visible, then enable | |
23974 | + this option and specify 'shwh' mount option. Although it may | |
23975 | + sounds like philosophy or something, but in technically it | |
23976 | + simply shows the name of whiteout with keeping its behaviour. | |
1facf9fc | 23977 | + |
4a4d8108 AM |
23978 | +config AUFS_BR_RAMFS |
23979 | + bool "Ramfs (initramfs/rootfs) as an aufs branch" | |
23980 | + help | |
23981 | + If you want to use ramfs as an aufs branch fs, then enable this | |
23982 | + option. Generally tmpfs is recommended. | |
23983 | + Aufs prohibited them to be a branch fs by default, because | |
23984 | + initramfs becomes unusable after switch_root or something | |
23985 | + generally. If you sets initramfs as an aufs branch and boot your | |
23986 | + system by switch_root, you will meet a problem easily since the | |
23987 | + files in initramfs may be inaccessible. | |
23988 | + Unless you are going to use ramfs as an aufs branch fs without | |
23989 | + switch_root or something, leave it N. | |
1facf9fc | 23990 | + |
4a4d8108 AM |
23991 | +config AUFS_BR_FUSE |
23992 | + bool "Fuse fs as an aufs branch" | |
23993 | + depends on FUSE_FS | |
23994 | + select AUFS_POLL | |
23995 | + help | |
23996 | + If you want to use fuse-based userspace filesystem as an aufs | |
23997 | + branch fs, then enable this option. | |
23998 | + It implements the internal poll(2) operation which is | |
23999 | + implemented by fuse only (curretnly). | |
1facf9fc | 24000 | + |
4a4d8108 AM |
24001 | +config AUFS_POLL |
24002 | + bool | |
24003 | + help | |
24004 | + Automatic configuration for internal use. | |
1facf9fc | 24005 | + |
4a4d8108 AM |
24006 | +config AUFS_BR_HFSPLUS |
24007 | + bool "Hfsplus as an aufs branch" | |
24008 | + depends on HFSPLUS_FS | |
24009 | + default y | |
24010 | + help | |
24011 | + If you want to use hfsplus fs as an aufs branch fs, then enable | |
24012 | + this option. This option introduces a small overhead at | |
24013 | + copying-up a file on hfsplus. | |
1facf9fc | 24014 | + |
4a4d8108 AM |
24015 | +config AUFS_BDEV_LOOP |
24016 | + bool | |
24017 | + depends on BLK_DEV_LOOP | |
24018 | + default y | |
24019 | + help | |
24020 | + Automatic configuration for internal use. | |
24021 | + Convert =[ym] into =y. | |
1308ab2a | 24022 | + |
4a4d8108 AM |
24023 | +config AUFS_DEBUG |
24024 | + bool "Debug aufs" | |
24025 | + help | |
24026 | + Enable this to compile aufs internal debug code. | |
24027 | + It will have a negative impact to the performance. | |
24028 | + | |
24029 | +config AUFS_MAGIC_SYSRQ | |
24030 | + bool | |
24031 | + depends on AUFS_DEBUG && MAGIC_SYSRQ | |
24032 | + default y | |
24033 | + help | |
24034 | + Automatic configuration for internal use. | |
24035 | + When aufs supports Magic SysRq, enabled automatically. | |
24036 | +endif | |
acd2b654 | 24037 | diff -urN /usr/share/empty/fs/aufs/lcnt.h linux/fs/aufs/lcnt.h |
eca34b5c | 24038 | --- /usr/share/empty/fs/aufs/lcnt.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24039 | +++ linux/fs/aufs/lcnt.h 2020-01-27 10:57:18.175538316 +0100 |
acd2b654 AM |
24040 | @@ -0,0 +1,186 @@ |
24041 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
24042 | +/* | |
016522bc | 24043 | + * Copyright (C) 2018-2020 Junjiro R. Okajima |
acd2b654 AM |
24044 | + * |
24045 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24046 | + * it under the terms of the GNU General Public License as published by | |
24047 | + * the Free Software Foundation; either version 2 of the License, or | |
24048 | + * (at your option) any later version. | |
24049 | + * | |
24050 | + * This program is distributed in the hope that it will be useful, | |
24051 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24052 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24053 | + * GNU General Public License for more details. | |
24054 | + * | |
24055 | + * You should have received a copy of the GNU General Public License | |
24056 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
24057 | + */ | |
24058 | + | |
24059 | +/* | |
24060 | + * simple long counter wrapper | |
24061 | + */ | |
24062 | + | |
24063 | +#ifndef __AUFS_LCNT_H__ | |
24064 | +#define __AUFS_LCNT_H__ | |
24065 | + | |
24066 | +#ifdef __KERNEL__ | |
24067 | + | |
24068 | +#include "debug.h" | |
24069 | + | |
24070 | +#define AuLCntATOMIC 1 | |
24071 | +#define AuLCntPCPUCNT 2 | |
24072 | +/* | |
24073 | + * why does percpu_refcount require extra synchronize_rcu()s in | |
24074 | + * au_br_do_free() | |
24075 | + */ | |
24076 | +#define AuLCntPCPUREF 3 | |
24077 | + | |
24078 | +/* #define AuLCntChosen AuLCntATOMIC */ | |
24079 | +#define AuLCntChosen AuLCntPCPUCNT | |
24080 | +/* #define AuLCntChosen AuLCntPCPUREF */ | |
24081 | + | |
24082 | +#if AuLCntChosen == AuLCntATOMIC | |
24083 | +#include <linux/atomic.h> | |
24084 | + | |
24085 | +typedef atomic_long_t au_lcnt_t; | |
24086 | + | |
24087 | +static inline int au_lcnt_init(au_lcnt_t *cnt, void *release __maybe_unused) | |
24088 | +{ | |
24089 | + atomic_long_set(cnt, 0); | |
24090 | + return 0; | |
24091 | +} | |
24092 | + | |
24093 | +static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) | |
24094 | +{ | |
24095 | + /* empty */ | |
24096 | +} | |
24097 | + | |
24098 | +static inline void au_lcnt_fin(au_lcnt_t *cnt __maybe_unused, | |
24099 | + int do_sync __maybe_unused) | |
24100 | +{ | |
24101 | + /* empty */ | |
24102 | +} | |
24103 | + | |
24104 | +static inline void au_lcnt_inc(au_lcnt_t *cnt) | |
24105 | +{ | |
24106 | + atomic_long_inc(cnt); | |
24107 | +} | |
24108 | + | |
24109 | +static inline void au_lcnt_dec(au_lcnt_t *cnt) | |
24110 | +{ | |
24111 | + atomic_long_dec(cnt); | |
24112 | +} | |
24113 | + | |
24114 | +static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev __maybe_unused) | |
24115 | +{ | |
24116 | + return atomic_long_read(cnt); | |
24117 | +} | |
24118 | +#endif | |
24119 | + | |
24120 | +#if AuLCntChosen == AuLCntPCPUCNT | |
24121 | +#include <linux/percpu_counter.h> | |
24122 | + | |
24123 | +typedef struct percpu_counter au_lcnt_t; | |
24124 | + | |
24125 | +static inline int au_lcnt_init(au_lcnt_t *cnt, void *release __maybe_unused) | |
24126 | +{ | |
24127 | + return percpu_counter_init(cnt, 0, GFP_NOFS); | |
24128 | +} | |
24129 | + | |
24130 | +static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) | |
24131 | +{ | |
24132 | + /* empty */ | |
24133 | +} | |
24134 | + | |
24135 | +static inline void au_lcnt_fin(au_lcnt_t *cnt, int do_sync __maybe_unused) | |
24136 | +{ | |
24137 | + percpu_counter_destroy(cnt); | |
24138 | +} | |
24139 | + | |
24140 | +static inline void au_lcnt_inc(au_lcnt_t *cnt) | |
24141 | +{ | |
24142 | + percpu_counter_inc(cnt); | |
24143 | +} | |
24144 | + | |
24145 | +static inline void au_lcnt_dec(au_lcnt_t *cnt) | |
24146 | +{ | |
24147 | + percpu_counter_dec(cnt); | |
24148 | +} | |
24149 | + | |
24150 | +static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev __maybe_unused) | |
24151 | +{ | |
24152 | + s64 n; | |
24153 | + | |
24154 | + n = percpu_counter_sum(cnt); | |
24155 | + BUG_ON(n < 0); | |
24156 | + if (LONG_MAX != LLONG_MAX | |
24157 | + && n > LONG_MAX) | |
24158 | + AuWarn1("%s\n", "wrap-around"); | |
24159 | + | |
24160 | + return n; | |
24161 | +} | |
24162 | +#endif | |
24163 | + | |
24164 | +#if AuLCntChosen == AuLCntPCPUREF | |
24165 | +#include <linux/percpu-refcount.h> | |
24166 | + | |
24167 | +typedef struct percpu_ref au_lcnt_t; | |
24168 | + | |
24169 | +static inline int au_lcnt_init(au_lcnt_t *cnt, percpu_ref_func_t *release) | |
24170 | +{ | |
24171 | + if (!release) | |
24172 | + release = percpu_ref_exit; | |
24173 | + return percpu_ref_init(cnt, release, /*percpu mode*/0, GFP_NOFS); | |
24174 | +} | |
24175 | + | |
24176 | +static inline void au_lcnt_wait_for_fin(au_lcnt_t *cnt __maybe_unused) | |
24177 | +{ | |
24178 | + synchronize_rcu(); | |
24179 | +} | |
24180 | + | |
24181 | +static inline void au_lcnt_fin(au_lcnt_t *cnt, int do_sync) | |
24182 | +{ | |
24183 | + percpu_ref_kill(cnt); | |
24184 | + if (do_sync) | |
24185 | + au_lcnt_wait_for_fin(cnt); | |
24186 | +} | |
24187 | + | |
24188 | +static inline void au_lcnt_inc(au_lcnt_t *cnt) | |
24189 | +{ | |
24190 | + percpu_ref_get(cnt); | |
24191 | +} | |
24192 | + | |
24193 | +static inline void au_lcnt_dec(au_lcnt_t *cnt) | |
24194 | +{ | |
24195 | + percpu_ref_put(cnt); | |
24196 | +} | |
24197 | + | |
24198 | +/* | |
24199 | + * avoid calling this func as possible. | |
24200 | + */ | |
24201 | +static inline long au_lcnt_read(au_lcnt_t *cnt, int do_rev) | |
24202 | +{ | |
24203 | + long l; | |
24204 | + | |
24205 | + percpu_ref_switch_to_atomic_sync(cnt); | |
24206 | + l = atomic_long_read(&cnt->count); | |
24207 | + if (do_rev) | |
24208 | + percpu_ref_switch_to_percpu(cnt); | |
24209 | + | |
24210 | + /* percpu_ref is initialized by 1 instead of 0 */ | |
24211 | + return l - 1; | |
24212 | +} | |
24213 | +#endif | |
24214 | + | |
24215 | +#ifdef CONFIG_AUFS_DEBUG | |
24216 | +#define AuLCntZero(val) do { \ | |
24217 | + long l = val; \ | |
24218 | + if (l) \ | |
24219 | + AuDbg("%s = %ld\n", #val, l); \ | |
24220 | +} while (0) | |
24221 | +#else | |
24222 | +#define AuLCntZero(val) do {} while (0) | |
24223 | +#endif | |
24224 | + | |
24225 | +#endif /* __KERNEL__ */ | |
24226 | +#endif /* __AUFS_LCNT_H__ */ | |
7f207e10 | 24227 | diff -urN /usr/share/empty/fs/aufs/loop.c linux/fs/aufs/loop.c |
eca34b5c | 24228 | --- /usr/share/empty/fs/aufs/loop.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24229 | +++ linux/fs/aufs/loop.c 2020-01-27 10:57:18.175538316 +0100 |
062440b3 | 24230 | @@ -0,0 +1,148 @@ |
cd7a4cd9 | 24231 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 24232 | +/* |
016522bc | 24233 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 24234 | + * |
24235 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24236 | + * it under the terms of the GNU General Public License as published by | |
24237 | + * the Free Software Foundation; either version 2 of the License, or | |
24238 | + * (at your option) any later version. | |
dece6358 AM |
24239 | + * |
24240 | + * This program is distributed in the hope that it will be useful, | |
24241 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24242 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24243 | + * GNU General Public License for more details. | |
24244 | + * | |
24245 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24246 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24247 | + */ |
24248 | + | |
24249 | +/* | |
24250 | + * support for loopback block device as a branch | |
24251 | + */ | |
24252 | + | |
1facf9fc | 24253 | +#include "aufs.h" |
24254 | + | |
392086de AM |
24255 | +/* added into drivers/block/loop.c */ |
24256 | +static struct file *(*backing_file_func)(struct super_block *sb); | |
24257 | + | |
1facf9fc | 24258 | +/* |
24259 | + * test if two lower dentries have overlapping branches. | |
24260 | + */ | |
b752ccd1 | 24261 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding) |
1facf9fc | 24262 | +{ |
b752ccd1 | 24263 | + struct super_block *h_sb; |
392086de AM |
24264 | + struct file *backing_file; |
24265 | + | |
24266 | + if (unlikely(!backing_file_func)) { | |
24267 | + /* don't load "loop" module here */ | |
24268 | + backing_file_func = symbol_get(loop_backing_file); | |
24269 | + if (unlikely(!backing_file_func)) | |
24270 | + /* "loop" module is not loaded */ | |
24271 | + return 0; | |
24272 | + } | |
1facf9fc | 24273 | + |
b752ccd1 | 24274 | + h_sb = h_adding->d_sb; |
392086de AM |
24275 | + backing_file = backing_file_func(h_sb); |
24276 | + if (!backing_file) | |
1facf9fc | 24277 | + return 0; |
24278 | + | |
2000de60 | 24279 | + h_adding = backing_file->f_path.dentry; |
b752ccd1 AM |
24280 | + /* |
24281 | + * h_adding can be local NFS. | |
24282 | + * in this case aufs cannot detect the loop. | |
24283 | + */ | |
24284 | + if (unlikely(h_adding->d_sb == sb)) | |
1facf9fc | 24285 | + return 1; |
b752ccd1 | 24286 | + return !!au_test_subdir(h_adding, sb->s_root); |
1facf9fc | 24287 | +} |
24288 | + | |
24289 | +/* true if a kernel thread named 'loop[0-9].*' accesses a file */ | |
24290 | +int au_test_loopback_kthread(void) | |
24291 | +{ | |
b752ccd1 AM |
24292 | + int ret; |
24293 | + struct task_struct *tsk = current; | |
a2a7ad62 | 24294 | + char c, comm[sizeof(tsk->comm)]; |
b752ccd1 AM |
24295 | + |
24296 | + ret = 0; | |
24297 | + if (tsk->flags & PF_KTHREAD) { | |
a2a7ad62 AM |
24298 | + get_task_comm(comm, tsk); |
24299 | + c = comm[4]; | |
b752ccd1 | 24300 | + ret = ('0' <= c && c <= '9' |
a2a7ad62 | 24301 | + && !strncmp(comm, "loop", 4)); |
b752ccd1 | 24302 | + } |
1facf9fc | 24303 | + |
b752ccd1 | 24304 | + return ret; |
1facf9fc | 24305 | +} |
87a755f4 AM |
24306 | + |
24307 | +/* ---------------------------------------------------------------------- */ | |
24308 | + | |
24309 | +#define au_warn_loopback_step 16 | |
24310 | +static int au_warn_loopback_nelem = au_warn_loopback_step; | |
24311 | +static unsigned long *au_warn_loopback_array; | |
24312 | + | |
24313 | +void au_warn_loopback(struct super_block *h_sb) | |
24314 | +{ | |
24315 | + int i, new_nelem; | |
24316 | + unsigned long *a, magic; | |
24317 | + static DEFINE_SPINLOCK(spin); | |
24318 | + | |
24319 | + magic = h_sb->s_magic; | |
24320 | + spin_lock(&spin); | |
24321 | + a = au_warn_loopback_array; | |
24322 | + for (i = 0; i < au_warn_loopback_nelem && *a; i++) | |
24323 | + if (a[i] == magic) { | |
24324 | + spin_unlock(&spin); | |
24325 | + return; | |
24326 | + } | |
24327 | + | |
24328 | + /* h_sb is new to us, print it */ | |
24329 | + if (i < au_warn_loopback_nelem) { | |
24330 | + a[i] = magic; | |
24331 | + goto pr; | |
24332 | + } | |
24333 | + | |
24334 | + /* expand the array */ | |
24335 | + new_nelem = au_warn_loopback_nelem + au_warn_loopback_step; | |
24336 | + a = au_kzrealloc(au_warn_loopback_array, | |
24337 | + au_warn_loopback_nelem * sizeof(unsigned long), | |
e2f27e51 AM |
24338 | + new_nelem * sizeof(unsigned long), GFP_ATOMIC, |
24339 | + /*may_shrink*/0); | |
87a755f4 AM |
24340 | + if (a) { |
24341 | + au_warn_loopback_nelem = new_nelem; | |
24342 | + au_warn_loopback_array = a; | |
24343 | + a[i] = magic; | |
24344 | + goto pr; | |
24345 | + } | |
24346 | + | |
24347 | + spin_unlock(&spin); | |
24348 | + AuWarn1("realloc failed, ignored\n"); | |
24349 | + return; | |
24350 | + | |
24351 | +pr: | |
24352 | + spin_unlock(&spin); | |
0c3ec466 AM |
24353 | + pr_warn("you may want to try another patch for loopback file " |
24354 | + "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic); | |
87a755f4 AM |
24355 | +} |
24356 | + | |
24357 | +int au_loopback_init(void) | |
24358 | +{ | |
24359 | + int err; | |
24360 | + struct super_block *sb __maybe_unused; | |
24361 | + | |
fbc438ed | 24362 | + BUILD_BUG_ON(sizeof(sb->s_magic) != sizeof(*au_warn_loopback_array)); |
87a755f4 AM |
24363 | + |
24364 | + err = 0; | |
24365 | + au_warn_loopback_array = kcalloc(au_warn_loopback_step, | |
24366 | + sizeof(unsigned long), GFP_NOFS); | |
24367 | + if (unlikely(!au_warn_loopback_array)) | |
24368 | + err = -ENOMEM; | |
24369 | + | |
24370 | + return err; | |
24371 | +} | |
24372 | + | |
24373 | +void au_loopback_fin(void) | |
24374 | +{ | |
79b8bda9 AM |
24375 | + if (backing_file_func) |
24376 | + symbol_put(loop_backing_file); | |
9f237c51 | 24377 | + au_kfree_try_rcu(au_warn_loopback_array); |
87a755f4 | 24378 | +} |
7f207e10 | 24379 | diff -urN /usr/share/empty/fs/aufs/loop.h linux/fs/aufs/loop.h |
eca34b5c | 24380 | --- /usr/share/empty/fs/aufs/loop.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24381 | +++ linux/fs/aufs/loop.h 2020-01-27 10:57:18.175538316 +0100 |
eca801bf | 24382 | @@ -0,0 +1,55 @@ |
062440b3 | 24383 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 24384 | +/* |
016522bc | 24385 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 24386 | + * |
24387 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24388 | + * it under the terms of the GNU General Public License as published by | |
24389 | + * the Free Software Foundation; either version 2 of the License, or | |
24390 | + * (at your option) any later version. | |
dece6358 AM |
24391 | + * |
24392 | + * This program is distributed in the hope that it will be useful, | |
24393 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24394 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24395 | + * GNU General Public License for more details. | |
24396 | + * | |
24397 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24398 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24399 | + */ |
24400 | + | |
24401 | +/* | |
24402 | + * support for loopback mount as a branch | |
24403 | + */ | |
24404 | + | |
24405 | +#ifndef __AUFS_LOOP_H__ | |
24406 | +#define __AUFS_LOOP_H__ | |
24407 | + | |
24408 | +#ifdef __KERNEL__ | |
24409 | + | |
dece6358 AM |
24410 | +struct dentry; |
24411 | +struct super_block; | |
1facf9fc | 24412 | + |
24413 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
392086de AM |
24414 | +/* drivers/block/loop.c */ |
24415 | +struct file *loop_backing_file(struct super_block *sb); | |
24416 | + | |
1facf9fc | 24417 | +/* loop.c */ |
b752ccd1 | 24418 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding); |
1facf9fc | 24419 | +int au_test_loopback_kthread(void); |
87a755f4 AM |
24420 | +void au_warn_loopback(struct super_block *h_sb); |
24421 | + | |
24422 | +int au_loopback_init(void); | |
24423 | +void au_loopback_fin(void); | |
1facf9fc | 24424 | +#else |
83b672a5 | 24425 | +AuStub(struct file *, loop_backing_file, return NULL, struct super_block *sb) |
eca801bf | 24426 | + |
4a4d8108 | 24427 | +AuStubInt0(au_test_loopback_overlap, struct super_block *sb, |
b752ccd1 | 24428 | + struct dentry *h_adding) |
4a4d8108 | 24429 | +AuStubInt0(au_test_loopback_kthread, void) |
87a755f4 AM |
24430 | +AuStubVoid(au_warn_loopback, struct super_block *h_sb) |
24431 | + | |
24432 | +AuStubInt0(au_loopback_init, void) | |
24433 | +AuStubVoid(au_loopback_fin, void) | |
1facf9fc | 24434 | +#endif /* BLK_DEV_LOOP */ |
24435 | + | |
24436 | +#endif /* __KERNEL__ */ | |
24437 | +#endif /* __AUFS_LOOP_H__ */ | |
7f207e10 | 24438 | diff -urN /usr/share/empty/fs/aufs/magic.mk linux/fs/aufs/magic.mk |
eca34b5c AM |
24439 | --- /usr/share/empty/fs/aufs/magic.mk 1970-01-01 01:00:00.000000000 +0100 |
24440 | +++ linux/fs/aufs/magic.mk 2019-07-11 15:42:14.468904634 +0200 | |
2121bcd9 AM |
24441 | @@ -0,0 +1,31 @@ |
24442 | +# SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 24443 | + |
24444 | +# defined in ${srctree}/fs/fuse/inode.c | |
24445 | +# tristate | |
24446 | +ifdef CONFIG_FUSE_FS | |
24447 | +ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546 | |
24448 | +endif | |
24449 | + | |
1facf9fc | 24450 | +# defined in ${srctree}/fs/xfs/xfs_sb.h |
24451 | +# tristate | |
24452 | +ifdef CONFIG_XFS_FS | |
24453 | +ccflags-y += -DXFS_SB_MAGIC=0x58465342 | |
24454 | +endif | |
24455 | + | |
24456 | +# defined in ${srctree}/fs/configfs/mount.c | |
24457 | +# tristate | |
24458 | +ifdef CONFIG_CONFIGFS_FS | |
24459 | +ccflags-y += -DCONFIGFS_MAGIC=0x62656570 | |
24460 | +endif | |
24461 | + | |
1facf9fc | 24462 | +# defined in ${srctree}/fs/ubifs/ubifs.h |
24463 | +# tristate | |
24464 | +ifdef CONFIG_UBIFS_FS | |
24465 | +ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905 | |
24466 | +endif | |
4a4d8108 AM |
24467 | + |
24468 | +# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h | |
24469 | +# tristate | |
24470 | +ifdef CONFIG_HFSPLUS_FS | |
24471 | +ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b | |
24472 | +endif | |
7f207e10 | 24473 | diff -urN /usr/share/empty/fs/aufs/Makefile linux/fs/aufs/Makefile |
eca34b5c AM |
24474 | --- /usr/share/empty/fs/aufs/Makefile 1970-01-01 01:00:00.000000000 +0100 |
24475 | +++ linux/fs/aufs/Makefile 2019-07-11 15:42:14.462237786 +0200 | |
2121bcd9 AM |
24476 | @@ -0,0 +1,46 @@ |
24477 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
24478 | + |
24479 | +include ${src}/magic.mk | |
24480 | +ifeq (${CONFIG_AUFS_FS},m) | |
24481 | +include ${src}/conf.mk | |
24482 | +endif | |
24483 | +-include ${src}/priv_def.mk | |
24484 | + | |
24485 | +# cf. include/linux/kernel.h | |
24486 | +# enable pr_debug | |
24487 | +ccflags-y += -DDEBUG | |
f6c5ef8b AM |
24488 | +# sparse requires the full pathname |
24489 | +ifdef M | |
523b37e3 | 24490 | +ccflags-y += -include ${M}/../../include/uapi/linux/aufs_type.h |
f6c5ef8b | 24491 | +else |
523b37e3 | 24492 | +ccflags-y += -include ${srctree}/include/uapi/linux/aufs_type.h |
f6c5ef8b | 24493 | +endif |
4a4d8108 AM |
24494 | + |
24495 | +obj-$(CONFIG_AUFS_FS) += aufs.o | |
24496 | +aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \ | |
24497 | + wkq.o vfsub.o dcsub.o \ | |
e49829fe | 24498 | + cpup.o whout.o wbr_policy.o \ |
4a4d8108 AM |
24499 | + dinfo.o dentry.o \ |
24500 | + dynop.o \ | |
24501 | + finfo.o file.o f_op.o \ | |
24502 | + dir.o vdir.o \ | |
24503 | + iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \ | |
c2b27bf2 | 24504 | + mvdown.o ioctl.o |
4a4d8108 AM |
24505 | + |
24506 | +# all are boolean | |
e49829fe | 24507 | +aufs-$(CONFIG_PROC_FS) += procfs.o plink.o |
4a4d8108 AM |
24508 | +aufs-$(CONFIG_SYSFS) += sysfs.o |
24509 | +aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o | |
24510 | +aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o | |
24511 | +aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o | |
24512 | +aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o | |
4a4d8108 | 24513 | +aufs-$(CONFIG_AUFS_EXPORT) += export.o |
c1595e42 JR |
24514 | +aufs-$(CONFIG_AUFS_XATTR) += xattr.o |
24515 | +aufs-$(CONFIG_FS_POSIX_ACL) += posix_acl.o | |
8b6a4947 | 24516 | +aufs-$(CONFIG_AUFS_DIRREN) += dirren.o |
076b876e | 24517 | +aufs-$(CONFIG_AUFS_FHSM) += fhsm.o |
4a4d8108 AM |
24518 | +aufs-$(CONFIG_AUFS_POLL) += poll.o |
24519 | +aufs-$(CONFIG_AUFS_RDU) += rdu.o | |
4a4d8108 AM |
24520 | +aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o |
24521 | +aufs-$(CONFIG_AUFS_DEBUG) += debug.o | |
24522 | +aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o | |
7f207e10 | 24523 | diff -urN /usr/share/empty/fs/aufs/module.c linux/fs/aufs/module.c |
eca34b5c | 24524 | --- /usr/share/empty/fs/aufs/module.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24525 | +++ linux/fs/aufs/module.c 2020-01-27 10:57:18.175538316 +0100 |
062440b3 | 24526 | @@ -0,0 +1,273 @@ |
cd7a4cd9 | 24527 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 24528 | +/* |
016522bc | 24529 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 24530 | + * |
24531 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24532 | + * it under the terms of the GNU General Public License as published by | |
24533 | + * the Free Software Foundation; either version 2 of the License, or | |
24534 | + * (at your option) any later version. | |
dece6358 AM |
24535 | + * |
24536 | + * This program is distributed in the hope that it will be useful, | |
24537 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24538 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24539 | + * GNU General Public License for more details. | |
24540 | + * | |
24541 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24542 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24543 | + */ |
24544 | + | |
24545 | +/* | |
24546 | + * module global variables and operations | |
24547 | + */ | |
24548 | + | |
24549 | +#include <linux/module.h> | |
24550 | +#include <linux/seq_file.h> | |
24551 | +#include "aufs.h" | |
24552 | + | |
e2f27e51 AM |
24553 | +/* shrinkable realloc */ |
24554 | +void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink) | |
1facf9fc | 24555 | +{ |
e2f27e51 AM |
24556 | + size_t sz; |
24557 | + int diff; | |
1facf9fc | 24558 | + |
e2f27e51 AM |
24559 | + sz = 0; |
24560 | + diff = -1; | |
24561 | + if (p) { | |
24562 | +#if 0 /* unused */ | |
24563 | + if (!new_sz) { | |
9f237c51 | 24564 | + au_kfree_rcu(p); |
e2f27e51 AM |
24565 | + p = NULL; |
24566 | + goto out; | |
24567 | + } | |
24568 | +#else | |
24569 | + AuDebugOn(!new_sz); | |
24570 | +#endif | |
24571 | + sz = ksize(p); | |
24572 | + diff = au_kmidx_sub(sz, new_sz); | |
24573 | + } | |
24574 | + if (sz && !diff) | |
24575 | + goto out; | |
24576 | + | |
24577 | + if (sz < new_sz) | |
24578 | + /* expand or SLOB */ | |
24579 | + p = krealloc(p, new_sz, gfp); | |
24580 | + else if (new_sz < sz && may_shrink) { | |
24581 | + /* shrink */ | |
24582 | + void *q; | |
24583 | + | |
24584 | + q = kmalloc(new_sz, gfp); | |
24585 | + if (q) { | |
24586 | + if (p) { | |
24587 | + memcpy(q, p, new_sz); | |
9f237c51 | 24588 | + au_kfree_try_rcu(p); |
e2f27e51 AM |
24589 | + } |
24590 | + p = q; | |
24591 | + } else | |
24592 | + p = NULL; | |
24593 | + } | |
24594 | + | |
24595 | +out: | |
24596 | + return p; | |
24597 | +} | |
24598 | + | |
24599 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, | |
24600 | + int may_shrink) | |
24601 | +{ | |
24602 | + p = au_krealloc(p, new_sz, gfp, may_shrink); | |
24603 | + if (p && new_sz > nused) | |
1facf9fc | 24604 | + memset(p + nused, 0, new_sz - nused); |
24605 | + return p; | |
24606 | +} | |
24607 | + | |
24608 | +/* ---------------------------------------------------------------------- */ | |
1facf9fc | 24609 | +/* |
24610 | + * aufs caches | |
24611 | + */ | |
1c60b727 | 24612 | +struct kmem_cache *au_cache[AuCache_Last]; |
5afbbe0d AM |
24613 | + |
24614 | +static void au_cache_fin(void) | |
24615 | +{ | |
24616 | + int i; | |
24617 | + | |
24618 | + /* | |
24619 | + * Make sure all delayed rcu free inodes are flushed before we | |
24620 | + * destroy cache. | |
24621 | + */ | |
24622 | + rcu_barrier(); | |
24623 | + | |
24624 | + /* excluding AuCache_HNOTIFY */ | |
24625 | + BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last); | |
24626 | + for (i = 0; i < AuCache_HNOTIFY; i++) { | |
1c60b727 AM |
24627 | + kmem_cache_destroy(au_cache[i]); |
24628 | + au_cache[i] = NULL; | |
5afbbe0d AM |
24629 | + } |
24630 | +} | |
24631 | + | |
1facf9fc | 24632 | +static int __init au_cache_init(void) |
24633 | +{ | |
1c60b727 AM |
24634 | + au_cache[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once); |
24635 | + if (au_cache[AuCache_DINFO]) | |
027c5e7a | 24636 | + /* SLAB_DESTROY_BY_RCU */ |
1c60b727 | 24637 | + au_cache[AuCache_ICNTNR] = AuCacheCtor(au_icntnr, |
f0c0a007 | 24638 | + au_icntnr_init_once); |
1c60b727 AM |
24639 | + if (au_cache[AuCache_ICNTNR]) |
24640 | + au_cache[AuCache_FINFO] = AuCacheCtor(au_finfo, | |
f0c0a007 | 24641 | + au_fi_init_once); |
1c60b727 AM |
24642 | + if (au_cache[AuCache_FINFO]) |
24643 | + au_cache[AuCache_VDIR] = AuCache(au_vdir); | |
24644 | + if (au_cache[AuCache_VDIR]) | |
24645 | + au_cache[AuCache_DEHSTR] = AuCache(au_vdir_dehstr); | |
24646 | + if (au_cache[AuCache_DEHSTR]) | |
1facf9fc | 24647 | + return 0; |
24648 | + | |
5afbbe0d | 24649 | + au_cache_fin(); |
1facf9fc | 24650 | + return -ENOMEM; |
24651 | +} | |
24652 | + | |
1facf9fc | 24653 | +/* ---------------------------------------------------------------------- */ |
24654 | + | |
24655 | +int au_dir_roflags; | |
24656 | + | |
e49829fe | 24657 | +#ifdef CONFIG_AUFS_SBILIST |
1e00d052 AM |
24658 | +/* |
24659 | + * iterate_supers_type() doesn't protect us from | |
24660 | + * remounting (branch management) | |
24661 | + */ | |
8b6a4947 | 24662 | +struct hlist_bl_head au_sbilist; |
e49829fe JR |
24663 | +#endif |
24664 | + | |
1facf9fc | 24665 | +/* |
24666 | + * functions for module interface. | |
24667 | + */ | |
24668 | +MODULE_LICENSE("GPL"); | |
24669 | +/* MODULE_LICENSE("GPL v2"); */ | |
dece6358 | 24670 | +MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>"); |
1facf9fc | 24671 | +MODULE_DESCRIPTION(AUFS_NAME |
24672 | + " -- Advanced multi layered unification filesystem"); | |
24673 | +MODULE_VERSION(AUFS_VERSION); | |
c06a8ce3 | 24674 | +MODULE_ALIAS_FS(AUFS_NAME); |
1facf9fc | 24675 | + |
1facf9fc | 24676 | +/* this module parameter has no meaning when SYSFS is disabled */ |
24677 | +int sysaufs_brs = 1; | |
24678 | +MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN"); | |
cd7a4cd9 | 24679 | +module_param_named(brs, sysaufs_brs, int, 0444); |
1facf9fc | 24680 | + |
076b876e | 24681 | +/* this module parameter has no meaning when USER_NS is disabled */ |
8cdd5066 | 24682 | +bool au_userns; |
076b876e | 24683 | +MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns"); |
cd7a4cd9 | 24684 | +module_param_named(allow_userns, au_userns, bool, 0444); |
076b876e | 24685 | + |
1facf9fc | 24686 | +/* ---------------------------------------------------------------------- */ |
24687 | + | |
24688 | +static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */ | |
24689 | + | |
24690 | +int au_seq_path(struct seq_file *seq, struct path *path) | |
24691 | +{ | |
79b8bda9 AM |
24692 | + int err; |
24693 | + | |
24694 | + err = seq_path(seq, path, au_esc_chars); | |
1c60b727 | 24695 | + if (err >= 0) |
79b8bda9 | 24696 | + err = 0; |
1c60b727 | 24697 | + else |
79b8bda9 AM |
24698 | + err = -ENOMEM; |
24699 | + | |
24700 | + return err; | |
1facf9fc | 24701 | +} |
24702 | + | |
24703 | +/* ---------------------------------------------------------------------- */ | |
24704 | + | |
24705 | +static int __init aufs_init(void) | |
24706 | +{ | |
24707 | + int err, i; | |
24708 | + char *p; | |
24709 | + | |
24710 | + p = au_esc_chars; | |
24711 | + for (i = 1; i <= ' '; i++) | |
24712 | + *p++ = i; | |
24713 | + *p++ = '\\'; | |
24714 | + *p++ = '\x7f'; | |
24715 | + *p = 0; | |
24716 | + | |
24717 | + au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE); | |
24718 | + | |
b95c5147 AM |
24719 | + memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop)); |
24720 | + for (i = 0; i < AuIop_Last; i++) | |
24721 | + aufs_iop_nogetattr[i].getattr = NULL; | |
24722 | + | |
1c60b727 | 24723 | + memset(au_cache, 0, sizeof(au_cache)); /* including hnotify */ |
f0c0a007 | 24724 | + |
e49829fe | 24725 | + au_sbilist_init(); |
1facf9fc | 24726 | + sysaufs_brs_init(); |
24727 | + au_debug_init(); | |
4a4d8108 | 24728 | + au_dy_init(); |
1facf9fc | 24729 | + err = sysaufs_init(); |
24730 | + if (unlikely(err)) | |
24731 | + goto out; | |
062440b3 | 24732 | + err = dbgaufs_init(); |
4f0767ce | 24733 | + if (unlikely(err)) |
953406b4 | 24734 | + goto out_sysaufs; |
062440b3 AM |
24735 | + err = au_procfs_init(); |
24736 | + if (unlikely(err)) | |
24737 | + goto out_dbgaufs; | |
e49829fe JR |
24738 | + err = au_wkq_init(); |
24739 | + if (unlikely(err)) | |
24740 | + goto out_procfs; | |
87a755f4 | 24741 | + err = au_loopback_init(); |
1facf9fc | 24742 | + if (unlikely(err)) |
24743 | + goto out_wkq; | |
87a755f4 AM |
24744 | + err = au_hnotify_init(); |
24745 | + if (unlikely(err)) | |
24746 | + goto out_loopback; | |
1facf9fc | 24747 | + err = au_sysrq_init(); |
24748 | + if (unlikely(err)) | |
24749 | + goto out_hin; | |
24750 | + err = au_cache_init(); | |
24751 | + if (unlikely(err)) | |
24752 | + goto out_sysrq; | |
076b876e AM |
24753 | + |
24754 | + aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0; | |
1facf9fc | 24755 | + err = register_filesystem(&aufs_fs_type); |
24756 | + if (unlikely(err)) | |
24757 | + goto out_cache; | |
076b876e | 24758 | + |
4a4d8108 AM |
24759 | + /* since we define pr_fmt, call printk directly */ |
24760 | + printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n"); | |
1facf9fc | 24761 | + goto out; /* success */ |
24762 | + | |
4f0767ce | 24763 | +out_cache: |
1facf9fc | 24764 | + au_cache_fin(); |
4f0767ce | 24765 | +out_sysrq: |
1facf9fc | 24766 | + au_sysrq_fin(); |
4f0767ce | 24767 | +out_hin: |
4a4d8108 | 24768 | + au_hnotify_fin(); |
87a755f4 AM |
24769 | +out_loopback: |
24770 | + au_loopback_fin(); | |
4f0767ce | 24771 | +out_wkq: |
1facf9fc | 24772 | + au_wkq_fin(); |
e49829fe JR |
24773 | +out_procfs: |
24774 | + au_procfs_fin(); | |
062440b3 AM |
24775 | +out_dbgaufs: |
24776 | + dbgaufs_fin(); | |
4f0767ce | 24777 | +out_sysaufs: |
1facf9fc | 24778 | + sysaufs_fin(); |
4a4d8108 | 24779 | + au_dy_fin(); |
4f0767ce | 24780 | +out: |
1facf9fc | 24781 | + return err; |
24782 | +} | |
24783 | + | |
24784 | +static void __exit aufs_exit(void) | |
24785 | +{ | |
24786 | + unregister_filesystem(&aufs_fs_type); | |
24787 | + au_cache_fin(); | |
24788 | + au_sysrq_fin(); | |
4a4d8108 | 24789 | + au_hnotify_fin(); |
87a755f4 | 24790 | + au_loopback_fin(); |
1facf9fc | 24791 | + au_wkq_fin(); |
e49829fe | 24792 | + au_procfs_fin(); |
062440b3 | 24793 | + dbgaufs_fin(); |
1facf9fc | 24794 | + sysaufs_fin(); |
4a4d8108 | 24795 | + au_dy_fin(); |
1facf9fc | 24796 | +} |
24797 | + | |
24798 | +module_init(aufs_init); | |
24799 | +module_exit(aufs_exit); | |
7f207e10 | 24800 | diff -urN /usr/share/empty/fs/aufs/module.h linux/fs/aufs/module.h |
eca34b5c | 24801 | --- /usr/share/empty/fs/aufs/module.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24802 | +++ linux/fs/aufs/module.h 2020-01-27 10:57:18.175538316 +0100 |
9f237c51 | 24803 | @@ -0,0 +1,166 @@ |
062440b3 | 24804 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 24805 | +/* |
016522bc | 24806 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 24807 | + * |
24808 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24809 | + * it under the terms of the GNU General Public License as published by | |
24810 | + * the Free Software Foundation; either version 2 of the License, or | |
24811 | + * (at your option) any later version. | |
dece6358 AM |
24812 | + * |
24813 | + * This program is distributed in the hope that it will be useful, | |
24814 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24815 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24816 | + * GNU General Public License for more details. | |
24817 | + * | |
24818 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24819 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24820 | + */ |
24821 | + | |
24822 | +/* | |
24823 | + * module initialization and module-global | |
24824 | + */ | |
24825 | + | |
24826 | +#ifndef __AUFS_MODULE_H__ | |
24827 | +#define __AUFS_MODULE_H__ | |
24828 | + | |
24829 | +#ifdef __KERNEL__ | |
24830 | + | |
24831 | +#include <linux/slab.h> | |
9f237c51 AM |
24832 | +#include "debug.h" |
24833 | +#include "dentry.h" | |
24834 | +#include "dir.h" | |
24835 | +#include "file.h" | |
24836 | +#include "inode.h" | |
1facf9fc | 24837 | + |
dece6358 AM |
24838 | +struct path; |
24839 | +struct seq_file; | |
24840 | + | |
1facf9fc | 24841 | +/* module parameters */ |
1facf9fc | 24842 | +extern int sysaufs_brs; |
8cdd5066 | 24843 | +extern bool au_userns; |
1facf9fc | 24844 | + |
24845 | +/* ---------------------------------------------------------------------- */ | |
24846 | + | |
24847 | +extern int au_dir_roflags; | |
24848 | + | |
e2f27e51 AM |
24849 | +void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink); |
24850 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, | |
24851 | + int may_shrink); | |
24852 | + | |
9f237c51 AM |
24853 | +/* |
24854 | + * Comparing the size of the object with sizeof(struct rcu_head) | |
24855 | + * case 1: object is always larger | |
24856 | + * --> au_kfree_rcu() or au_kfree_do_rcu() | |
24857 | + * case 2: object is always smaller | |
24858 | + * --> au_kfree_small() | |
24859 | + * case 3: object can be any size | |
24860 | + * --> au_kfree_try_rcu() | |
24861 | + */ | |
24862 | + | |
24863 | +static inline void au_kfree_do_rcu(const void *p) | |
24864 | +{ | |
24865 | + struct { | |
24866 | + struct rcu_head rcu; | |
24867 | + } *a = (void *)p; | |
24868 | + | |
24869 | + kfree_rcu(a, rcu); | |
24870 | +} | |
24871 | + | |
24872 | +#define au_kfree_rcu(_p) do { \ | |
24873 | + typeof(_p) p = (_p); \ | |
24874 | + BUILD_BUG_ON(sizeof(*p) < sizeof(struct rcu_head)); \ | |
24875 | + if (p) \ | |
24876 | + au_kfree_do_rcu(p); \ | |
24877 | + } while (0) | |
24878 | + | |
24879 | +#define au_kfree_do_sz_test(sz) (sz >= sizeof(struct rcu_head)) | |
24880 | +#define au_kfree_sz_test(p) (p && au_kfree_do_sz_test(ksize(p))) | |
24881 | + | |
24882 | +static inline void au_kfree_try_rcu(const void *p) | |
24883 | +{ | |
24884 | + if (!p) | |
24885 | + return; | |
24886 | + if (au_kfree_sz_test(p)) | |
24887 | + au_kfree_do_rcu(p); | |
24888 | + else | |
24889 | + kfree(p); | |
24890 | +} | |
24891 | + | |
24892 | +static inline void au_kfree_small(const void *p) | |
24893 | +{ | |
24894 | + if (!p) | |
24895 | + return; | |
24896 | + AuDebugOn(au_kfree_sz_test(p)); | |
24897 | + kfree(p); | |
24898 | +} | |
24899 | + | |
e2f27e51 AM |
24900 | +static inline int au_kmidx_sub(size_t sz, size_t new_sz) |
24901 | +{ | |
24902 | +#ifndef CONFIG_SLOB | |
24903 | + return kmalloc_index(sz) - kmalloc_index(new_sz); | |
24904 | +#else | |
24905 | + return -1; /* SLOB is untested */ | |
24906 | +#endif | |
24907 | +} | |
24908 | + | |
1facf9fc | 24909 | +int au_seq_path(struct seq_file *seq, struct path *path); |
24910 | + | |
e49829fe JR |
24911 | +#ifdef CONFIG_PROC_FS |
24912 | +/* procfs.c */ | |
24913 | +int __init au_procfs_init(void); | |
24914 | +void au_procfs_fin(void); | |
24915 | +#else | |
24916 | +AuStubInt0(au_procfs_init, void); | |
24917 | +AuStubVoid(au_procfs_fin, void); | |
24918 | +#endif | |
24919 | + | |
4f0767ce JR |
24920 | +/* ---------------------------------------------------------------------- */ |
24921 | + | |
1c60b727 | 24922 | +/* kmem cache */ |
1facf9fc | 24923 | +enum { |
24924 | + AuCache_DINFO, | |
24925 | + AuCache_ICNTNR, | |
24926 | + AuCache_FINFO, | |
24927 | + AuCache_VDIR, | |
24928 | + AuCache_DEHSTR, | |
7eafdf33 | 24929 | + AuCache_HNOTIFY, /* must be last */ |
1facf9fc | 24930 | + AuCache_Last |
24931 | +}; | |
24932 | + | |
1c60b727 | 24933 | +extern struct kmem_cache *au_cache[AuCache_Last]; |
f0c0a007 | 24934 | + |
4a4d8108 AM |
24935 | +#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) |
24936 | +#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) | |
24937 | +#define AuCacheCtor(type, ctor) \ | |
24938 | + kmem_cache_create(#type, sizeof(struct type), \ | |
24939 | + __alignof__(struct type), AuCacheFlags, ctor) | |
1facf9fc | 24940 | + |
9f237c51 AM |
24941 | +#define AuCacheFuncs(name, index) \ |
24942 | + static inline struct au_##name *au_cache_alloc_##name(void) \ | |
24943 | + { return kmem_cache_alloc(au_cache[AuCache_##index], GFP_NOFS); } \ | |
24944 | + static inline void au_cache_free_##name##_norcu(struct au_##name *p) \ | |
24945 | + { kmem_cache_free(au_cache[AuCache_##index], p); } \ | |
24946 | + \ | |
24947 | + static inline void au_cache_free_##name##_rcu_cb(struct rcu_head *rcu) \ | |
24948 | + { void *p = rcu; \ | |
24949 | + p -= offsetof(struct au_##name, rcu); \ | |
24950 | + kmem_cache_free(au_cache[AuCache_##index], p); } \ | |
24951 | + static inline void au_cache_free_##name##_rcu(struct au_##name *p) \ | |
24952 | + { BUILD_BUG_ON(sizeof(struct au_##name) < sizeof(struct rcu_head)); \ | |
24953 | + call_rcu(&p->rcu, au_cache_free_##name##_rcu_cb); } \ | |
24954 | + \ | |
24955 | + static inline void au_cache_free_##name(struct au_##name *p) \ | |
24956 | + { /* au_cache_free_##name##_norcu(p); */ \ | |
24957 | + au_cache_free_##name##_rcu(p); } | |
1facf9fc | 24958 | + |
24959 | +AuCacheFuncs(dinfo, DINFO); | |
24960 | +AuCacheFuncs(icntnr, ICNTNR); | |
24961 | +AuCacheFuncs(finfo, FINFO); | |
24962 | +AuCacheFuncs(vdir, VDIR); | |
4a4d8108 AM |
24963 | +AuCacheFuncs(vdir_dehstr, DEHSTR); |
24964 | +#ifdef CONFIG_AUFS_HNOTIFY | |
24965 | +AuCacheFuncs(hnotify, HNOTIFY); | |
24966 | +#endif | |
1facf9fc | 24967 | + |
4a4d8108 AM |
24968 | +#endif /* __KERNEL__ */ |
24969 | +#endif /* __AUFS_MODULE_H__ */ | |
c2b27bf2 | 24970 | diff -urN /usr/share/empty/fs/aufs/mvdown.c linux/fs/aufs/mvdown.c |
eca34b5c | 24971 | --- /usr/share/empty/fs/aufs/mvdown.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 24972 | +++ linux/fs/aufs/mvdown.c 2020-01-27 10:57:18.175538316 +0100 |
ba1aed25 | 24973 | @@ -0,0 +1,706 @@ |
cd7a4cd9 | 24974 | +// SPDX-License-Identifier: GPL-2.0 |
c2b27bf2 | 24975 | +/* |
016522bc | 24976 | + * Copyright (C) 2011-2020 Junjiro R. Okajima |
c2b27bf2 AM |
24977 | + * |
24978 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24979 | + * it under the terms of the GNU General Public License as published by | |
24980 | + * the Free Software Foundation; either version 2 of the License, or | |
24981 | + * (at your option) any later version. | |
24982 | + * | |
24983 | + * This program is distributed in the hope that it will be useful, | |
24984 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24985 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24986 | + * GNU General Public License for more details. | |
24987 | + * | |
24988 | + * You should have received a copy of the GNU General Public License | |
523b37e3 AM |
24989 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
24990 | + */ | |
24991 | + | |
24992 | +/* | |
24993 | + * move-down, opposite of copy-up | |
c2b27bf2 AM |
24994 | + */ |
24995 | + | |
24996 | +#include "aufs.h" | |
24997 | + | |
c2b27bf2 AM |
24998 | +struct au_mvd_args { |
24999 | + struct { | |
c2b27bf2 AM |
25000 | + struct super_block *h_sb; |
25001 | + struct dentry *h_parent; | |
25002 | + struct au_hinode *hdir; | |
392086de | 25003 | + struct inode *h_dir, *h_inode; |
c1595e42 | 25004 | + struct au_pin pin; |
c2b27bf2 AM |
25005 | + } info[AUFS_MVDOWN_NARRAY]; |
25006 | + | |
25007 | + struct aufs_mvdown mvdown; | |
25008 | + struct dentry *dentry, *parent; | |
25009 | + struct inode *inode, *dir; | |
25010 | + struct super_block *sb; | |
25011 | + aufs_bindex_t bopq, bwh, bfound; | |
25012 | + unsigned char rename_lock; | |
c2b27bf2 AM |
25013 | +}; |
25014 | + | |
392086de | 25015 | +#define mvd_errno mvdown.au_errno |
076b876e AM |
25016 | +#define mvd_bsrc mvdown.stbr[AUFS_MVDOWN_UPPER].bindex |
25017 | +#define mvd_src_brid mvdown.stbr[AUFS_MVDOWN_UPPER].brid | |
25018 | +#define mvd_bdst mvdown.stbr[AUFS_MVDOWN_LOWER].bindex | |
25019 | +#define mvd_dst_brid mvdown.stbr[AUFS_MVDOWN_LOWER].brid | |
c2b27bf2 | 25020 | + |
392086de AM |
25021 | +#define mvd_h_src_sb info[AUFS_MVDOWN_UPPER].h_sb |
25022 | +#define mvd_h_src_parent info[AUFS_MVDOWN_UPPER].h_parent | |
25023 | +#define mvd_hdir_src info[AUFS_MVDOWN_UPPER].hdir | |
25024 | +#define mvd_h_src_dir info[AUFS_MVDOWN_UPPER].h_dir | |
25025 | +#define mvd_h_src_inode info[AUFS_MVDOWN_UPPER].h_inode | |
c1595e42 | 25026 | +#define mvd_pin_src info[AUFS_MVDOWN_UPPER].pin |
392086de AM |
25027 | + |
25028 | +#define mvd_h_dst_sb info[AUFS_MVDOWN_LOWER].h_sb | |
25029 | +#define mvd_h_dst_parent info[AUFS_MVDOWN_LOWER].h_parent | |
25030 | +#define mvd_hdir_dst info[AUFS_MVDOWN_LOWER].hdir | |
25031 | +#define mvd_h_dst_dir info[AUFS_MVDOWN_LOWER].h_dir | |
25032 | +#define mvd_h_dst_inode info[AUFS_MVDOWN_LOWER].h_inode | |
c1595e42 | 25033 | +#define mvd_pin_dst info[AUFS_MVDOWN_LOWER].pin |
c2b27bf2 AM |
25034 | + |
25035 | +#define AU_MVD_PR(flag, ...) do { \ | |
25036 | + if (flag) \ | |
25037 | + pr_err(__VA_ARGS__); \ | |
25038 | + } while (0) | |
25039 | + | |
076b876e AM |
25040 | +static int find_lower_writable(struct au_mvd_args *a) |
25041 | +{ | |
25042 | + struct super_block *sb; | |
5afbbe0d | 25043 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
25044 | + struct au_branch *br; |
25045 | + | |
25046 | + sb = a->sb; | |
25047 | + bindex = a->mvd_bsrc; | |
5afbbe0d | 25048 | + bbot = au_sbbot(sb); |
076b876e | 25049 | + if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER) |
5afbbe0d | 25050 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e AM |
25051 | + br = au_sbr(sb, bindex); |
25052 | + if (au_br_fhsm(br->br_perm) | |
8b6a4947 | 25053 | + && !sb_rdonly(au_br_sb(br))) |
076b876e AM |
25054 | + return bindex; |
25055 | + } | |
25056 | + else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER)) | |
5afbbe0d | 25057 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e AM |
25058 | + br = au_sbr(sb, bindex); |
25059 | + if (!au_br_rdonly(br)) | |
25060 | + return bindex; | |
25061 | + } | |
25062 | + else | |
5afbbe0d | 25063 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e | 25064 | + br = au_sbr(sb, bindex); |
8b6a4947 | 25065 | + if (!sb_rdonly(au_br_sb(br))) { |
076b876e AM |
25066 | + if (au_br_rdonly(br)) |
25067 | + a->mvdown.flags | |
25068 | + |= AUFS_MVDOWN_ROLOWER_R; | |
25069 | + return bindex; | |
25070 | + } | |
25071 | + } | |
25072 | + | |
25073 | + return -1; | |
25074 | +} | |
25075 | + | |
c2b27bf2 | 25076 | +/* make the parent dir on bdst */ |
392086de | 25077 | +static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25078 | +{ |
25079 | + int err; | |
25080 | + | |
25081 | + err = 0; | |
25082 | + a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc); | |
25083 | + a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst); | |
25084 | + a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc); | |
25085 | + a->mvd_h_dst_parent = NULL; | |
5afbbe0d | 25086 | + if (au_dbbot(a->parent) >= a->mvd_bdst) |
c2b27bf2 AM |
25087 | + a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); |
25088 | + if (!a->mvd_h_dst_parent) { | |
25089 | + err = au_cpdown_dirs(a->dentry, a->mvd_bdst); | |
25090 | + if (unlikely(err)) { | |
392086de | 25091 | + AU_MVD_PR(dmsg, "cpdown_dirs failed\n"); |
c2b27bf2 AM |
25092 | + goto out; |
25093 | + } | |
25094 | + a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); | |
25095 | + } | |
25096 | + | |
25097 | +out: | |
25098 | + AuTraceErr(err); | |
25099 | + return err; | |
25100 | +} | |
25101 | + | |
25102 | +/* lock them all */ | |
392086de | 25103 | +static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25104 | +{ |
25105 | + int err; | |
25106 | + struct dentry *h_trap; | |
25107 | + | |
25108 | + a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc); | |
25109 | + a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst); | |
c1595e42 JR |
25110 | + err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst, |
25111 | + au_opt_udba(a->sb), | |
25112 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
25113 | + AuTraceErr(err); | |
25114 | + if (unlikely(err)) { | |
25115 | + AU_MVD_PR(dmsg, "pin_dst failed\n"); | |
25116 | + goto out; | |
25117 | + } | |
25118 | + | |
c2b27bf2 AM |
25119 | + if (a->mvd_h_src_sb != a->mvd_h_dst_sb) { |
25120 | + a->rename_lock = 0; | |
c1595e42 JR |
25121 | + au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, |
25122 | + AuLsc_DI_PARENT, AuLsc_I_PARENT3, | |
25123 | + au_opt_udba(a->sb), | |
25124 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
25125 | + err = au_do_pin(&a->mvd_pin_src); | |
25126 | + AuTraceErr(err); | |
5527c038 | 25127 | + a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); |
c1595e42 JR |
25128 | + if (unlikely(err)) { |
25129 | + AU_MVD_PR(dmsg, "pin_src failed\n"); | |
25130 | + goto out_dst; | |
25131 | + } | |
25132 | + goto out; /* success */ | |
c2b27bf2 AM |
25133 | + } |
25134 | + | |
c2b27bf2 | 25135 | + a->rename_lock = 1; |
c1595e42 JR |
25136 | + au_pin_hdir_unlock(&a->mvd_pin_dst); |
25137 | + err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, | |
25138 | + au_opt_udba(a->sb), | |
25139 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
25140 | + AuTraceErr(err); | |
5527c038 | 25141 | + a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); |
c1595e42 JR |
25142 | + if (unlikely(err)) { |
25143 | + AU_MVD_PR(dmsg, "pin_src failed\n"); | |
25144 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
25145 | + goto out_dst; | |
25146 | + } | |
25147 | + au_pin_hdir_unlock(&a->mvd_pin_src); | |
c2b27bf2 AM |
25148 | + h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, |
25149 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
25150 | + if (h_trap) { | |
25151 | + err = (h_trap != a->mvd_h_src_parent); | |
25152 | + if (err) | |
25153 | + err = (h_trap != a->mvd_h_dst_parent); | |
25154 | + } | |
25155 | + BUG_ON(err); /* it should never happen */ | |
c1595e42 JR |
25156 | + if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) { |
25157 | + err = -EBUSY; | |
25158 | + AuTraceErr(err); | |
25159 | + vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, | |
25160 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
25161 | + au_pin_hdir_lock(&a->mvd_pin_src); | |
25162 | + au_unpin(&a->mvd_pin_src); | |
25163 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
25164 | + goto out_dst; | |
25165 | + } | |
25166 | + goto out; /* success */ | |
c2b27bf2 | 25167 | + |
c1595e42 JR |
25168 | +out_dst: |
25169 | + au_unpin(&a->mvd_pin_dst); | |
c2b27bf2 AM |
25170 | +out: |
25171 | + AuTraceErr(err); | |
25172 | + return err; | |
25173 | +} | |
25174 | + | |
392086de | 25175 | +static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 | 25176 | +{ |
c1595e42 JR |
25177 | + if (!a->rename_lock) |
25178 | + au_unpin(&a->mvd_pin_src); | |
25179 | + else { | |
c2b27bf2 AM |
25180 | + vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, |
25181 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
c1595e42 JR |
25182 | + au_pin_hdir_lock(&a->mvd_pin_src); |
25183 | + au_unpin(&a->mvd_pin_src); | |
25184 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
25185 | + } | |
25186 | + au_unpin(&a->mvd_pin_dst); | |
c2b27bf2 AM |
25187 | +} |
25188 | + | |
25189 | +/* copy-down the file */ | |
392086de | 25190 | +static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25191 | +{ |
25192 | + int err; | |
25193 | + struct au_cp_generic cpg = { | |
25194 | + .dentry = a->dentry, | |
25195 | + .bdst = a->mvd_bdst, | |
25196 | + .bsrc = a->mvd_bsrc, | |
25197 | + .len = -1, | |
c1595e42 | 25198 | + .pin = &a->mvd_pin_dst, |
c2b27bf2 AM |
25199 | + .flags = AuCpup_DTIME | AuCpup_HOPEN |
25200 | + }; | |
25201 | + | |
25202 | + AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst); | |
392086de AM |
25203 | + if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER) |
25204 | + au_fset_cpup(cpg.flags, OVERWRITE); | |
25205 | + if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER) | |
25206 | + au_fset_cpup(cpg.flags, RWDST); | |
c2b27bf2 AM |
25207 | + err = au_sio_cpdown_simple(&cpg); |
25208 | + if (unlikely(err)) | |
392086de | 25209 | + AU_MVD_PR(dmsg, "cpdown failed\n"); |
c2b27bf2 AM |
25210 | + |
25211 | + AuTraceErr(err); | |
25212 | + return err; | |
25213 | +} | |
25214 | + | |
25215 | +/* | |
25216 | + * unlink the whiteout on bdst if exist which may be created by UDBA while we | |
25217 | + * were sleeping | |
25218 | + */ | |
392086de | 25219 | +static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25220 | +{ |
25221 | + int err; | |
25222 | + struct path h_path; | |
25223 | + struct au_branch *br; | |
523b37e3 | 25224 | + struct inode *delegated; |
c2b27bf2 AM |
25225 | + |
25226 | + br = au_sbr(a->sb, a->mvd_bdst); | |
25227 | + h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br); | |
25228 | + err = PTR_ERR(h_path.dentry); | |
25229 | + if (IS_ERR(h_path.dentry)) { | |
392086de | 25230 | + AU_MVD_PR(dmsg, "wh_lkup failed\n"); |
c2b27bf2 AM |
25231 | + goto out; |
25232 | + } | |
25233 | + | |
25234 | + err = 0; | |
5527c038 | 25235 | + if (d_is_positive(h_path.dentry)) { |
c2b27bf2 | 25236 | + h_path.mnt = au_br_mnt(br); |
523b37e3 | 25237 | + delegated = NULL; |
5527c038 | 25238 | + err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path, |
523b37e3 AM |
25239 | + &delegated, /*force*/0); |
25240 | + if (unlikely(err == -EWOULDBLOCK)) { | |
25241 | + pr_warn("cannot retry for NFSv4 delegation" | |
25242 | + " for an internal unlink\n"); | |
25243 | + iput(delegated); | |
25244 | + } | |
c2b27bf2 | 25245 | + if (unlikely(err)) |
392086de | 25246 | + AU_MVD_PR(dmsg, "wh_unlink failed\n"); |
c2b27bf2 AM |
25247 | + } |
25248 | + dput(h_path.dentry); | |
25249 | + | |
25250 | +out: | |
25251 | + AuTraceErr(err); | |
25252 | + return err; | |
25253 | +} | |
25254 | + | |
25255 | +/* | |
25256 | + * unlink the topmost h_dentry | |
c2b27bf2 | 25257 | + */ |
392086de | 25258 | +static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25259 | +{ |
25260 | + int err; | |
25261 | + struct path h_path; | |
523b37e3 | 25262 | + struct inode *delegated; |
c2b27bf2 AM |
25263 | + |
25264 | + h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc); | |
25265 | + h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc); | |
523b37e3 AM |
25266 | + delegated = NULL; |
25267 | + err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0); | |
25268 | + if (unlikely(err == -EWOULDBLOCK)) { | |
25269 | + pr_warn("cannot retry for NFSv4 delegation" | |
25270 | + " for an internal unlink\n"); | |
25271 | + iput(delegated); | |
25272 | + } | |
c2b27bf2 | 25273 | + if (unlikely(err)) |
392086de | 25274 | + AU_MVD_PR(dmsg, "unlink failed\n"); |
c2b27bf2 AM |
25275 | + |
25276 | + AuTraceErr(err); | |
25277 | + return err; | |
25278 | +} | |
25279 | + | |
076b876e AM |
25280 | +/* Since mvdown succeeded, we ignore an error of this function */ |
25281 | +static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a) | |
25282 | +{ | |
25283 | + int err; | |
25284 | + struct au_branch *br; | |
25285 | + | |
25286 | + a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED; | |
25287 | + br = au_sbr(a->sb, a->mvd_bsrc); | |
25288 | + err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs); | |
25289 | + if (!err) { | |
25290 | + br = au_sbr(a->sb, a->mvd_bdst); | |
25291 | + a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id; | |
25292 | + err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs); | |
25293 | + } | |
25294 | + if (!err) | |
25295 | + a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED; | |
25296 | + else | |
25297 | + AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err); | |
25298 | +} | |
25299 | + | |
c2b27bf2 AM |
25300 | +/* |
25301 | + * copy-down the file and unlink the bsrc file. | |
25302 | + * - unlink the bdst whout if exist | |
25303 | + * - copy-down the file (with whtmp name and rename) | |
25304 | + * - unlink the bsrc file | |
25305 | + */ | |
392086de | 25306 | +static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25307 | +{ |
25308 | + int err; | |
25309 | + | |
392086de | 25310 | + err = au_do_mkdir(dmsg, a); |
c2b27bf2 | 25311 | + if (!err) |
392086de | 25312 | + err = au_do_lock(dmsg, a); |
c2b27bf2 AM |
25313 | + if (unlikely(err)) |
25314 | + goto out; | |
25315 | + | |
25316 | + /* | |
25317 | + * do not revert the activities we made on bdst since they should be | |
25318 | + * harmless in aufs. | |
25319 | + */ | |
25320 | + | |
392086de | 25321 | + err = au_do_cpdown(dmsg, a); |
c2b27bf2 | 25322 | + if (!err) |
392086de AM |
25323 | + err = au_do_unlink_wh(dmsg, a); |
25324 | + if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) | |
25325 | + err = au_do_unlink(dmsg, a); | |
c2b27bf2 AM |
25326 | + if (unlikely(err)) |
25327 | + goto out_unlock; | |
25328 | + | |
c1595e42 JR |
25329 | + AuDbg("%pd2, 0x%x, %d --> %d\n", |
25330 | + a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst); | |
076b876e AM |
25331 | + if (find_lower_writable(a) < 0) |
25332 | + a->mvdown.flags |= AUFS_MVDOWN_BOTTOM; | |
25333 | + | |
25334 | + if (a->mvdown.flags & AUFS_MVDOWN_STFS) | |
25335 | + au_do_stfs(dmsg, a); | |
25336 | + | |
c2b27bf2 | 25337 | + /* maintain internal array */ |
392086de AM |
25338 | + if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) { |
25339 | + au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL); | |
5afbbe0d | 25340 | + au_set_dbtop(a->dentry, a->mvd_bdst); |
392086de | 25341 | + au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0); |
5afbbe0d | 25342 | + au_set_ibtop(a->inode, a->mvd_bdst); |
79b8bda9 AM |
25343 | + } else { |
25344 | + /* hide the lower */ | |
25345 | + au_set_h_dptr(a->dentry, a->mvd_bdst, NULL); | |
5afbbe0d | 25346 | + au_set_dbbot(a->dentry, a->mvd_bsrc); |
79b8bda9 | 25347 | + au_set_h_iptr(a->inode, a->mvd_bdst, NULL, /*flags*/0); |
5afbbe0d | 25348 | + au_set_ibbot(a->inode, a->mvd_bsrc); |
392086de | 25349 | + } |
5afbbe0d AM |
25350 | + if (au_dbbot(a->dentry) < a->mvd_bdst) |
25351 | + au_set_dbbot(a->dentry, a->mvd_bdst); | |
25352 | + if (au_ibbot(a->inode) < a->mvd_bdst) | |
25353 | + au_set_ibbot(a->inode, a->mvd_bdst); | |
c2b27bf2 AM |
25354 | + |
25355 | +out_unlock: | |
392086de | 25356 | + au_do_unlock(dmsg, a); |
c2b27bf2 AM |
25357 | +out: |
25358 | + AuTraceErr(err); | |
25359 | + return err; | |
25360 | +} | |
25361 | + | |
25362 | +/* ---------------------------------------------------------------------- */ | |
25363 | + | |
c2b27bf2 | 25364 | +/* make sure the file is idle */ |
392086de | 25365 | +static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25366 | +{ |
25367 | + int err, plinked; | |
c2b27bf2 AM |
25368 | + |
25369 | + err = 0; | |
c2b27bf2 | 25370 | + plinked = !!au_opt_test(au_mntflags(a->sb), PLINK); |
5afbbe0d | 25371 | + if (au_dbtop(a->dentry) == a->mvd_bsrc |
c1595e42 | 25372 | + && au_dcount(a->dentry) == 1 |
c2b27bf2 | 25373 | + && atomic_read(&a->inode->i_count) == 1 |
392086de | 25374 | + /* && a->mvd_h_src_inode->i_nlink == 1 */ |
c2b27bf2 AM |
25375 | + && (!plinked || !au_plink_test(a->inode)) |
25376 | + && a->inode->i_nlink == 1) | |
25377 | + goto out; | |
25378 | + | |
25379 | + err = -EBUSY; | |
392086de | 25380 | + AU_MVD_PR(dmsg, |
c1595e42 | 25381 | + "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n", |
5afbbe0d | 25382 | + a->mvd_bsrc, au_dbtop(a->dentry), au_dcount(a->dentry), |
c2b27bf2 | 25383 | + atomic_read(&a->inode->i_count), a->inode->i_nlink, |
392086de | 25384 | + a->mvd_h_src_inode->i_nlink, |
c2b27bf2 AM |
25385 | + plinked, plinked ? au_plink_test(a->inode) : 0); |
25386 | + | |
25387 | +out: | |
25388 | + AuTraceErr(err); | |
25389 | + return err; | |
25390 | +} | |
25391 | + | |
25392 | +/* make sure the parent dir is fine */ | |
392086de | 25393 | +static int au_mvd_args_parent(const unsigned char dmsg, |
c2b27bf2 AM |
25394 | + struct au_mvd_args *a) |
25395 | +{ | |
25396 | + int err; | |
25397 | + aufs_bindex_t bindex; | |
25398 | + | |
25399 | + err = 0; | |
25400 | + if (unlikely(au_alive_dir(a->parent))) { | |
25401 | + err = -ENOENT; | |
392086de | 25402 | + AU_MVD_PR(dmsg, "parent dir is dead\n"); |
c2b27bf2 AM |
25403 | + goto out; |
25404 | + } | |
25405 | + | |
25406 | + a->bopq = au_dbdiropq(a->parent); | |
25407 | + bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst); | |
25408 | + AuDbg("b%d\n", bindex); | |
25409 | + if (unlikely((bindex >= 0 && bindex < a->mvd_bdst) | |
25410 | + || (a->bopq != -1 && a->bopq < a->mvd_bdst))) { | |
25411 | + err = -EINVAL; | |
392086de AM |
25412 | + a->mvd_errno = EAU_MVDOWN_OPAQUE; |
25413 | + AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n", | |
c2b27bf2 AM |
25414 | + a->bopq, a->mvd_bdst); |
25415 | + } | |
25416 | + | |
25417 | +out: | |
25418 | + AuTraceErr(err); | |
25419 | + return err; | |
25420 | +} | |
25421 | + | |
392086de | 25422 | +static int au_mvd_args_intermediate(const unsigned char dmsg, |
c2b27bf2 AM |
25423 | + struct au_mvd_args *a) |
25424 | +{ | |
25425 | + int err; | |
25426 | + struct au_dinfo *dinfo, *tmp; | |
25427 | + | |
25428 | + /* lookup the next lower positive entry */ | |
25429 | + err = -ENOMEM; | |
25430 | + tmp = au_di_alloc(a->sb, AuLsc_DI_TMP); | |
25431 | + if (unlikely(!tmp)) | |
25432 | + goto out; | |
25433 | + | |
25434 | + a->bfound = -1; | |
25435 | + a->bwh = -1; | |
25436 | + dinfo = au_di(a->dentry); | |
25437 | + au_di_cp(tmp, dinfo); | |
25438 | + au_di_swap(tmp, dinfo); | |
25439 | + | |
25440 | + /* returns the number of positive dentries */ | |
5afbbe0d AM |
25441 | + err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1, |
25442 | + /* AuLkup_IGNORE_PERM */ 0); | |
c2b27bf2 AM |
25443 | + if (!err) |
25444 | + a->bwh = au_dbwh(a->dentry); | |
25445 | + else if (err > 0) | |
5afbbe0d | 25446 | + a->bfound = au_dbtop(a->dentry); |
c2b27bf2 AM |
25447 | + |
25448 | + au_di_swap(tmp, dinfo); | |
25449 | + au_rw_write_unlock(&tmp->di_rwsem); | |
25450 | + au_di_free(tmp); | |
25451 | + if (unlikely(err < 0)) | |
392086de | 25452 | + AU_MVD_PR(dmsg, "failed look-up lower\n"); |
c2b27bf2 AM |
25453 | + |
25454 | + /* | |
25455 | + * here, we have these cases. | |
25456 | + * bfound == -1 | |
25457 | + * no positive dentry under bsrc. there are more sub-cases. | |
25458 | + * bwh < 0 | |
25459 | + * there no whiteout, we can safely move-down. | |
25460 | + * bwh <= bsrc | |
25461 | + * impossible | |
25462 | + * bsrc < bwh && bwh < bdst | |
25463 | + * there is a whiteout on RO branch. cannot proceed. | |
25464 | + * bwh == bdst | |
25465 | + * there is a whiteout on the RW target branch. it should | |
25466 | + * be removed. | |
25467 | + * bdst < bwh | |
25468 | + * there is a whiteout somewhere unrelated branch. | |
25469 | + * -1 < bfound && bfound <= bsrc | |
25470 | + * impossible. | |
25471 | + * bfound < bdst | |
25472 | + * found, but it is on RO branch between bsrc and bdst. cannot | |
25473 | + * proceed. | |
25474 | + * bfound == bdst | |
25475 | + * found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return | |
25476 | + * error. | |
25477 | + * bdst < bfound | |
25478 | + * found, after we create the file on bdst, it will be hidden. | |
25479 | + */ | |
25480 | + | |
25481 | + AuDebugOn(a->bfound == -1 | |
25482 | + && a->bwh != -1 | |
25483 | + && a->bwh <= a->mvd_bsrc); | |
25484 | + AuDebugOn(-1 < a->bfound | |
25485 | + && a->bfound <= a->mvd_bsrc); | |
25486 | + | |
25487 | + err = -EINVAL; | |
25488 | + if (a->bfound == -1 | |
25489 | + && a->mvd_bsrc < a->bwh | |
25490 | + && a->bwh != -1 | |
25491 | + && a->bwh < a->mvd_bdst) { | |
392086de AM |
25492 | + a->mvd_errno = EAU_MVDOWN_WHITEOUT; |
25493 | + AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n", | |
c2b27bf2 AM |
25494 | + a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh); |
25495 | + goto out; | |
25496 | + } else if (a->bfound != -1 && a->bfound < a->mvd_bdst) { | |
392086de AM |
25497 | + a->mvd_errno = EAU_MVDOWN_UPPER; |
25498 | + AU_MVD_PR(dmsg, "bdst %d, bfound %d\n", | |
c2b27bf2 AM |
25499 | + a->mvd_bdst, a->bfound); |
25500 | + goto out; | |
25501 | + } | |
25502 | + | |
25503 | + err = 0; /* success */ | |
25504 | + | |
25505 | +out: | |
25506 | + AuTraceErr(err); | |
25507 | + return err; | |
25508 | +} | |
25509 | + | |
392086de | 25510 | +static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25511 | +{ |
25512 | + int err; | |
25513 | + | |
392086de AM |
25514 | + err = 0; |
25515 | + if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER) | |
25516 | + && a->bfound == a->mvd_bdst) | |
25517 | + err = -EEXIST; | |
c2b27bf2 AM |
25518 | + AuTraceErr(err); |
25519 | + return err; | |
25520 | +} | |
25521 | + | |
392086de | 25522 | +static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25523 | +{ |
25524 | + int err; | |
25525 | + struct au_branch *br; | |
25526 | + | |
25527 | + err = -EISDIR; | |
25528 | + if (unlikely(S_ISDIR(a->inode->i_mode))) | |
25529 | + goto out; | |
25530 | + | |
25531 | + err = -EINVAL; | |
392086de | 25532 | + if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER)) |
5afbbe0d | 25533 | + a->mvd_bsrc = au_ibtop(a->inode); |
392086de AM |
25534 | + else { |
25535 | + a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid); | |
25536 | + if (unlikely(a->mvd_bsrc < 0 | |
5afbbe0d AM |
25537 | + || (a->mvd_bsrc < au_dbtop(a->dentry) |
25538 | + || au_dbbot(a->dentry) < a->mvd_bsrc | |
392086de | 25539 | + || !au_h_dptr(a->dentry, a->mvd_bsrc)) |
5afbbe0d AM |
25540 | + || (a->mvd_bsrc < au_ibtop(a->inode) |
25541 | + || au_ibbot(a->inode) < a->mvd_bsrc | |
392086de AM |
25542 | + || !au_h_iptr(a->inode, a->mvd_bsrc)))) { |
25543 | + a->mvd_errno = EAU_MVDOWN_NOUPPER; | |
25544 | + AU_MVD_PR(dmsg, "no upper\n"); | |
25545 | + goto out; | |
25546 | + } | |
25547 | + } | |
5afbbe0d | 25548 | + if (unlikely(a->mvd_bsrc == au_sbbot(a->sb))) { |
392086de AM |
25549 | + a->mvd_errno = EAU_MVDOWN_BOTTOM; |
25550 | + AU_MVD_PR(dmsg, "on the bottom\n"); | |
c2b27bf2 AM |
25551 | + goto out; |
25552 | + } | |
392086de | 25553 | + a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc); |
c2b27bf2 AM |
25554 | + br = au_sbr(a->sb, a->mvd_bsrc); |
25555 | + err = au_br_rdonly(br); | |
392086de AM |
25556 | + if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) { |
25557 | + if (unlikely(err)) | |
25558 | + goto out; | |
25559 | + } else if (!(vfsub_native_ro(a->mvd_h_src_inode) | |
25560 | + || IS_APPEND(a->mvd_h_src_inode))) { | |
25561 | + if (err) | |
25562 | + a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R; | |
25563 | + /* go on */ | |
25564 | + } else | |
c2b27bf2 AM |
25565 | + goto out; |
25566 | + | |
25567 | + err = -EINVAL; | |
392086de AM |
25568 | + if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) { |
25569 | + a->mvd_bdst = find_lower_writable(a); | |
25570 | + if (unlikely(a->mvd_bdst < 0)) { | |
25571 | + a->mvd_errno = EAU_MVDOWN_BOTTOM; | |
25572 | + AU_MVD_PR(dmsg, "no writable lower branch\n"); | |
25573 | + goto out; | |
25574 | + } | |
25575 | + } else { | |
25576 | + a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid); | |
25577 | + if (unlikely(a->mvd_bdst < 0 | |
5afbbe0d | 25578 | + || au_sbbot(a->sb) < a->mvd_bdst)) { |
392086de AM |
25579 | + a->mvd_errno = EAU_MVDOWN_NOLOWERBR; |
25580 | + AU_MVD_PR(dmsg, "no lower brid\n"); | |
25581 | + goto out; | |
25582 | + } | |
c2b27bf2 AM |
25583 | + } |
25584 | + | |
392086de | 25585 | + err = au_mvd_args_busy(dmsg, a); |
c2b27bf2 | 25586 | + if (!err) |
392086de | 25587 | + err = au_mvd_args_parent(dmsg, a); |
c2b27bf2 | 25588 | + if (!err) |
392086de | 25589 | + err = au_mvd_args_intermediate(dmsg, a); |
c2b27bf2 | 25590 | + if (!err) |
392086de | 25591 | + err = au_mvd_args_exist(dmsg, a); |
c2b27bf2 AM |
25592 | + if (!err) |
25593 | + AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst); | |
25594 | + | |
25595 | +out: | |
25596 | + AuTraceErr(err); | |
25597 | + return err; | |
25598 | +} | |
25599 | + | |
25600 | +int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg) | |
25601 | +{ | |
392086de AM |
25602 | + int err, e; |
25603 | + unsigned char dmsg; | |
25604 | + struct au_mvd_args *args; | |
79b8bda9 | 25605 | + struct inode *inode; |
c2b27bf2 | 25606 | + |
79b8bda9 | 25607 | + inode = d_inode(dentry); |
c2b27bf2 AM |
25608 | + err = -EPERM; |
25609 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
25610 | + goto out; | |
25611 | + | |
392086de AM |
25612 | + err = -ENOMEM; |
25613 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
25614 | + if (unlikely(!args)) | |
25615 | + goto out; | |
25616 | + | |
25617 | + err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown)); | |
25618 | + if (!err) | |
ba1aed25 AM |
25619 | + /* VERIFY_WRITE */ |
25620 | + err = !access_ok(uarg, sizeof(*uarg)); | |
c2b27bf2 AM |
25621 | + if (unlikely(err)) { |
25622 | + err = -EFAULT; | |
392086de AM |
25623 | + AuTraceErr(err); |
25624 | + goto out_free; | |
c2b27bf2 | 25625 | + } |
392086de AM |
25626 | + AuDbg("flags 0x%x\n", args->mvdown.flags); |
25627 | + args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R); | |
25628 | + args->mvdown.au_errno = 0; | |
25629 | + args->dentry = dentry; | |
79b8bda9 | 25630 | + args->inode = inode; |
392086de | 25631 | + args->sb = dentry->d_sb; |
c2b27bf2 | 25632 | + |
392086de AM |
25633 | + err = -ENOENT; |
25634 | + dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG); | |
25635 | + args->parent = dget_parent(dentry); | |
5527c038 | 25636 | + args->dir = d_inode(args->parent); |
febd17d6 | 25637 | + inode_lock_nested(args->dir, I_MUTEX_PARENT); |
392086de AM |
25638 | + dput(args->parent); |
25639 | + if (unlikely(args->parent != dentry->d_parent)) { | |
25640 | + AU_MVD_PR(dmsg, "parent dir is moved\n"); | |
c2b27bf2 AM |
25641 | + goto out_dir; |
25642 | + } | |
25643 | + | |
febd17d6 | 25644 | + inode_lock_nested(inode, I_MUTEX_CHILD); |
b95c5147 | 25645 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_NOPLMW); |
c2b27bf2 AM |
25646 | + if (unlikely(err)) |
25647 | + goto out_inode; | |
25648 | + | |
392086de AM |
25649 | + di_write_lock_parent(args->parent); |
25650 | + err = au_mvd_args(dmsg, args); | |
c2b27bf2 AM |
25651 | + if (unlikely(err)) |
25652 | + goto out_parent; | |
25653 | + | |
392086de | 25654 | + err = au_do_mvdown(dmsg, args); |
c2b27bf2 AM |
25655 | + if (unlikely(err)) |
25656 | + goto out_parent; | |
c2b27bf2 | 25657 | + |
392086de | 25658 | + au_cpup_attr_timesizes(args->dir); |
79b8bda9 AM |
25659 | + au_cpup_attr_timesizes(inode); |
25660 | + if (!(args->mvdown.flags & AUFS_MVDOWN_KUPPER)) | |
25661 | + au_cpup_igen(inode, au_h_iptr(inode, args->mvd_bdst)); | |
c2b27bf2 AM |
25662 | + /* au_digen_dec(dentry); */ |
25663 | + | |
25664 | +out_parent: | |
392086de | 25665 | + di_write_unlock(args->parent); |
c2b27bf2 AM |
25666 | + aufs_read_unlock(dentry, AuLock_DW); |
25667 | +out_inode: | |
febd17d6 | 25668 | + inode_unlock(inode); |
c2b27bf2 | 25669 | +out_dir: |
febd17d6 | 25670 | + inode_unlock(args->dir); |
392086de AM |
25671 | +out_free: |
25672 | + e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown)); | |
25673 | + if (unlikely(e)) | |
25674 | + err = -EFAULT; | |
9f237c51 | 25675 | + au_kfree_rcu(args); |
c2b27bf2 AM |
25676 | +out: |
25677 | + AuTraceErr(err); | |
25678 | + return err; | |
25679 | +} | |
25680 | diff -urN /usr/share/empty/fs/aufs/opts.c linux/fs/aufs/opts.c | |
eca34b5c | 25681 | --- /usr/share/empty/fs/aufs/opts.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 25682 | +++ linux/fs/aufs/opts.c 2020-01-27 10:57:18.175538316 +0100 |
eca34b5c | 25683 | @@ -0,0 +1,1880 @@ |
cd7a4cd9 | 25684 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 25685 | +/* |
016522bc | 25686 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 25687 | + * |
25688 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25689 | + * it under the terms of the GNU General Public License as published by | |
25690 | + * the Free Software Foundation; either version 2 of the License, or | |
25691 | + * (at your option) any later version. | |
dece6358 AM |
25692 | + * |
25693 | + * This program is distributed in the hope that it will be useful, | |
25694 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25695 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25696 | + * GNU General Public License for more details. | |
25697 | + * | |
25698 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 25699 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 25700 | + */ |
25701 | + | |
25702 | +/* | |
25703 | + * mount options/flags | |
25704 | + */ | |
25705 | + | |
dece6358 | 25706 | +#include <linux/namei.h> |
1facf9fc | 25707 | +#include <linux/types.h> /* a distribution requires */ |
25708 | +#include <linux/parser.h> | |
25709 | +#include "aufs.h" | |
25710 | + | |
25711 | +/* ---------------------------------------------------------------------- */ | |
25712 | + | |
25713 | +enum { | |
25714 | + Opt_br, | |
7e9cd9fe AM |
25715 | + Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend, |
25716 | + Opt_idel, Opt_imod, | |
25717 | + Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, | |
dece6358 | 25718 | + Opt_rdblk_def, Opt_rdhash_def, |
7e9cd9fe | 25719 | + Opt_xino, Opt_noxino, |
1facf9fc | 25720 | + Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino, |
25721 | + Opt_trunc_xino_path, Opt_itrunc_xino, | |
25722 | + Opt_trunc_xib, Opt_notrunc_xib, | |
dece6358 | 25723 | + Opt_shwh, Opt_noshwh, |
1facf9fc | 25724 | + Opt_plink, Opt_noplink, Opt_list_plink, |
25725 | + Opt_udba, | |
4a4d8108 | 25726 | + Opt_dio, Opt_nodio, |
1facf9fc | 25727 | + Opt_diropq_a, Opt_diropq_w, |
25728 | + Opt_warn_perm, Opt_nowarn_perm, | |
25729 | + Opt_wbr_copyup, Opt_wbr_create, | |
076b876e | 25730 | + Opt_fhsm_sec, |
1facf9fc | 25731 | + Opt_verbose, Opt_noverbose, |
25732 | + Opt_sum, Opt_nosum, Opt_wsum, | |
076b876e | 25733 | + Opt_dirperm1, Opt_nodirperm1, |
8b6a4947 | 25734 | + Opt_dirren, Opt_nodirren, |
c1595e42 | 25735 | + Opt_acl, Opt_noacl, |
1facf9fc | 25736 | + Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err |
25737 | +}; | |
25738 | + | |
25739 | +static match_table_t options = { | |
25740 | + {Opt_br, "br=%s"}, | |
25741 | + {Opt_br, "br:%s"}, | |
25742 | + | |
25743 | + {Opt_add, "add=%d:%s"}, | |
25744 | + {Opt_add, "add:%d:%s"}, | |
25745 | + {Opt_add, "ins=%d:%s"}, | |
25746 | + {Opt_add, "ins:%d:%s"}, | |
25747 | + {Opt_append, "append=%s"}, | |
25748 | + {Opt_append, "append:%s"}, | |
25749 | + {Opt_prepend, "prepend=%s"}, | |
25750 | + {Opt_prepend, "prepend:%s"}, | |
25751 | + | |
25752 | + {Opt_del, "del=%s"}, | |
25753 | + {Opt_del, "del:%s"}, | |
25754 | + /* {Opt_idel, "idel:%d"}, */ | |
25755 | + {Opt_mod, "mod=%s"}, | |
25756 | + {Opt_mod, "mod:%s"}, | |
25757 | + /* {Opt_imod, "imod:%d:%s"}, */ | |
25758 | + | |
25759 | + {Opt_dirwh, "dirwh=%d"}, | |
25760 | + | |
25761 | + {Opt_xino, "xino=%s"}, | |
25762 | + {Opt_noxino, "noxino"}, | |
25763 | + {Opt_trunc_xino, "trunc_xino"}, | |
25764 | + {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"}, | |
25765 | + {Opt_notrunc_xino, "notrunc_xino"}, | |
25766 | + {Opt_trunc_xino_path, "trunc_xino=%s"}, | |
25767 | + {Opt_itrunc_xino, "itrunc_xino=%d"}, | |
25768 | + /* {Opt_zxino, "zxino=%s"}, */ | |
25769 | + {Opt_trunc_xib, "trunc_xib"}, | |
25770 | + {Opt_notrunc_xib, "notrunc_xib"}, | |
25771 | + | |
e49829fe | 25772 | +#ifdef CONFIG_PROC_FS |
1facf9fc | 25773 | + {Opt_plink, "plink"}, |
e49829fe JR |
25774 | +#else |
25775 | + {Opt_ignore_silent, "plink"}, | |
25776 | +#endif | |
25777 | + | |
1facf9fc | 25778 | + {Opt_noplink, "noplink"}, |
e49829fe | 25779 | + |
1facf9fc | 25780 | +#ifdef CONFIG_AUFS_DEBUG |
25781 | + {Opt_list_plink, "list_plink"}, | |
25782 | +#endif | |
25783 | + | |
25784 | + {Opt_udba, "udba=%s"}, | |
25785 | + | |
4a4d8108 AM |
25786 | + {Opt_dio, "dio"}, |
25787 | + {Opt_nodio, "nodio"}, | |
25788 | + | |
8b6a4947 AM |
25789 | +#ifdef CONFIG_AUFS_DIRREN |
25790 | + {Opt_dirren, "dirren"}, | |
25791 | + {Opt_nodirren, "nodirren"}, | |
25792 | +#else | |
25793 | + {Opt_ignore, "dirren"}, | |
25794 | + {Opt_ignore_silent, "nodirren"}, | |
25795 | +#endif | |
25796 | + | |
076b876e AM |
25797 | +#ifdef CONFIG_AUFS_FHSM |
25798 | + {Opt_fhsm_sec, "fhsm_sec=%d"}, | |
25799 | +#else | |
8b6a4947 | 25800 | + {Opt_ignore, "fhsm_sec=%d"}, |
076b876e AM |
25801 | +#endif |
25802 | + | |
1facf9fc | 25803 | + {Opt_diropq_a, "diropq=always"}, |
25804 | + {Opt_diropq_a, "diropq=a"}, | |
25805 | + {Opt_diropq_w, "diropq=whiteouted"}, | |
25806 | + {Opt_diropq_w, "diropq=w"}, | |
25807 | + | |
25808 | + {Opt_warn_perm, "warn_perm"}, | |
25809 | + {Opt_nowarn_perm, "nowarn_perm"}, | |
25810 | + | |
25811 | + /* keep them temporary */ | |
1facf9fc | 25812 | + {Opt_ignore_silent, "nodlgt"}, |
8b6a4947 | 25813 | + {Opt_ignore, "clean_plink"}, |
1facf9fc | 25814 | + |
dece6358 AM |
25815 | +#ifdef CONFIG_AUFS_SHWH |
25816 | + {Opt_shwh, "shwh"}, | |
25817 | +#endif | |
25818 | + {Opt_noshwh, "noshwh"}, | |
25819 | + | |
076b876e AM |
25820 | + {Opt_dirperm1, "dirperm1"}, |
25821 | + {Opt_nodirperm1, "nodirperm1"}, | |
25822 | + | |
1facf9fc | 25823 | + {Opt_verbose, "verbose"}, |
25824 | + {Opt_verbose, "v"}, | |
25825 | + {Opt_noverbose, "noverbose"}, | |
25826 | + {Opt_noverbose, "quiet"}, | |
25827 | + {Opt_noverbose, "q"}, | |
25828 | + {Opt_noverbose, "silent"}, | |
25829 | + | |
25830 | + {Opt_sum, "sum"}, | |
25831 | + {Opt_nosum, "nosum"}, | |
25832 | + {Opt_wsum, "wsum"}, | |
25833 | + | |
25834 | + {Opt_rdcache, "rdcache=%d"}, | |
25835 | + {Opt_rdblk, "rdblk=%d"}, | |
dece6358 | 25836 | + {Opt_rdblk_def, "rdblk=def"}, |
1facf9fc | 25837 | + {Opt_rdhash, "rdhash=%d"}, |
dece6358 | 25838 | + {Opt_rdhash_def, "rdhash=def"}, |
1facf9fc | 25839 | + |
25840 | + {Opt_wbr_create, "create=%s"}, | |
25841 | + {Opt_wbr_create, "create_policy=%s"}, | |
25842 | + {Opt_wbr_copyup, "cpup=%s"}, | |
25843 | + {Opt_wbr_copyup, "copyup=%s"}, | |
25844 | + {Opt_wbr_copyup, "copyup_policy=%s"}, | |
25845 | + | |
c1595e42 JR |
25846 | + /* generic VFS flag */ |
25847 | +#ifdef CONFIG_FS_POSIX_ACL | |
25848 | + {Opt_acl, "acl"}, | |
25849 | + {Opt_noacl, "noacl"}, | |
25850 | +#else | |
8b6a4947 | 25851 | + {Opt_ignore, "acl"}, |
c1595e42 JR |
25852 | + {Opt_ignore_silent, "noacl"}, |
25853 | +#endif | |
25854 | + | |
1facf9fc | 25855 | + /* internal use for the scripts */ |
25856 | + {Opt_ignore_silent, "si=%s"}, | |
25857 | + | |
25858 | + {Opt_br, "dirs=%s"}, | |
25859 | + {Opt_ignore, "debug=%d"}, | |
25860 | + {Opt_ignore, "delete=whiteout"}, | |
25861 | + {Opt_ignore, "delete=all"}, | |
25862 | + {Opt_ignore, "imap=%s"}, | |
25863 | + | |
1308ab2a | 25864 | + /* temporary workaround, due to old mount(8)? */ |
25865 | + {Opt_ignore_silent, "relatime"}, | |
25866 | + | |
1facf9fc | 25867 | + {Opt_err, NULL} |
25868 | +}; | |
25869 | + | |
25870 | +/* ---------------------------------------------------------------------- */ | |
25871 | + | |
076b876e | 25872 | +static const char *au_parser_pattern(int val, match_table_t tbl) |
1facf9fc | 25873 | +{ |
076b876e AM |
25874 | + struct match_token *p; |
25875 | + | |
25876 | + p = tbl; | |
25877 | + while (p->pattern) { | |
25878 | + if (p->token == val) | |
25879 | + return p->pattern; | |
25880 | + p++; | |
1facf9fc | 25881 | + } |
25882 | + BUG(); | |
25883 | + return "??"; | |
25884 | +} | |
25885 | + | |
076b876e AM |
25886 | +static const char *au_optstr(int *val, match_table_t tbl) |
25887 | +{ | |
25888 | + struct match_token *p; | |
25889 | + int v; | |
25890 | + | |
25891 | + v = *val; | |
2000de60 JR |
25892 | + if (!v) |
25893 | + goto out; | |
076b876e | 25894 | + p = tbl; |
2000de60 JR |
25895 | + while (p->pattern) { |
25896 | + if (p->token | |
25897 | + && (v & p->token) == p->token) { | |
076b876e AM |
25898 | + *val &= ~p->token; |
25899 | + return p->pattern; | |
25900 | + } | |
25901 | + p++; | |
25902 | + } | |
2000de60 JR |
25903 | + |
25904 | +out: | |
076b876e AM |
25905 | + return NULL; |
25906 | +} | |
25907 | + | |
1facf9fc | 25908 | +/* ---------------------------------------------------------------------- */ |
25909 | + | |
1e00d052 | 25910 | +static match_table_t brperm = { |
1facf9fc | 25911 | + {AuBrPerm_RO, AUFS_BRPERM_RO}, |
25912 | + {AuBrPerm_RR, AUFS_BRPERM_RR}, | |
25913 | + {AuBrPerm_RW, AUFS_BRPERM_RW}, | |
1e00d052 AM |
25914 | + {0, NULL} |
25915 | +}; | |
1facf9fc | 25916 | + |
86dc4139 | 25917 | +static match_table_t brattr = { |
076b876e AM |
25918 | + /* general */ |
25919 | + {AuBrAttr_COO_REG, AUFS_BRATTR_COO_REG}, | |
25920 | + {AuBrAttr_COO_ALL, AUFS_BRATTR_COO_ALL}, | |
c1595e42 | 25921 | + /* 'unpin' attrib is meaningless since linux-3.18-rc1 */ |
86dc4139 | 25922 | + {AuBrAttr_UNPIN, AUFS_BRATTR_UNPIN}, |
2000de60 | 25923 | +#ifdef CONFIG_AUFS_FHSM |
076b876e | 25924 | + {AuBrAttr_FHSM, AUFS_BRATTR_FHSM}, |
2000de60 JR |
25925 | +#endif |
25926 | +#ifdef CONFIG_AUFS_XATTR | |
c1595e42 JR |
25927 | + {AuBrAttr_ICEX, AUFS_BRATTR_ICEX}, |
25928 | + {AuBrAttr_ICEX_SEC, AUFS_BRATTR_ICEX_SEC}, | |
25929 | + {AuBrAttr_ICEX_SYS, AUFS_BRATTR_ICEX_SYS}, | |
25930 | + {AuBrAttr_ICEX_TR, AUFS_BRATTR_ICEX_TR}, | |
25931 | + {AuBrAttr_ICEX_USR, AUFS_BRATTR_ICEX_USR}, | |
25932 | + {AuBrAttr_ICEX_OTH, AUFS_BRATTR_ICEX_OTH}, | |
2000de60 | 25933 | +#endif |
076b876e AM |
25934 | + |
25935 | + /* ro/rr branch */ | |
1e00d052 | 25936 | + {AuBrRAttr_WH, AUFS_BRRATTR_WH}, |
076b876e AM |
25937 | + |
25938 | + /* rw branch */ | |
25939 | + {AuBrWAttr_MOO, AUFS_BRWATTR_MOO}, | |
1e00d052 | 25940 | + {AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH}, |
076b876e | 25941 | + |
1e00d052 | 25942 | + {0, NULL} |
1facf9fc | 25943 | +}; |
25944 | + | |
1e00d052 AM |
25945 | +static int br_attr_val(char *str, match_table_t table, substring_t args[]) |
25946 | +{ | |
25947 | + int attr, v; | |
25948 | + char *p; | |
25949 | + | |
25950 | + attr = 0; | |
25951 | + do { | |
25952 | + p = strchr(str, '+'); | |
25953 | + if (p) | |
25954 | + *p = 0; | |
25955 | + v = match_token(str, table, args); | |
076b876e AM |
25956 | + if (v) { |
25957 | + if (v & AuBrAttr_CMOO_Mask) | |
25958 | + attr &= ~AuBrAttr_CMOO_Mask; | |
1e00d052 | 25959 | + attr |= v; |
076b876e | 25960 | + } else { |
1e00d052 AM |
25961 | + if (p) |
25962 | + *p = '+'; | |
0c3ec466 | 25963 | + pr_warn("ignored branch attribute %s\n", str); |
1e00d052 AM |
25964 | + break; |
25965 | + } | |
25966 | + if (p) | |
25967 | + str = p + 1; | |
25968 | + } while (p); | |
25969 | + | |
25970 | + return attr; | |
25971 | +} | |
25972 | + | |
076b876e AM |
25973 | +static int au_do_optstr_br_attr(au_br_perm_str_t *str, int perm) |
25974 | +{ | |
25975 | + int sz; | |
25976 | + const char *p; | |
25977 | + char *q; | |
25978 | + | |
076b876e AM |
25979 | + q = str->a; |
25980 | + *q = 0; | |
25981 | + p = au_optstr(&perm, brattr); | |
25982 | + if (p) { | |
25983 | + sz = strlen(p); | |
25984 | + memcpy(q, p, sz + 1); | |
25985 | + q += sz; | |
25986 | + } else | |
25987 | + goto out; | |
25988 | + | |
25989 | + do { | |
25990 | + p = au_optstr(&perm, brattr); | |
25991 | + if (p) { | |
25992 | + *q++ = '+'; | |
25993 | + sz = strlen(p); | |
25994 | + memcpy(q, p, sz + 1); | |
25995 | + q += sz; | |
25996 | + } | |
25997 | + } while (p); | |
25998 | + | |
25999 | +out: | |
c1595e42 | 26000 | + return q - str->a; |
076b876e AM |
26001 | +} |
26002 | + | |
4a4d8108 | 26003 | +static int noinline_for_stack br_perm_val(char *perm) |
1facf9fc | 26004 | +{ |
076b876e AM |
26005 | + int val, bad, sz; |
26006 | + char *p; | |
1facf9fc | 26007 | + substring_t args[MAX_OPT_ARGS]; |
076b876e | 26008 | + au_br_perm_str_t attr; |
1facf9fc | 26009 | + |
1e00d052 AM |
26010 | + p = strchr(perm, '+'); |
26011 | + if (p) | |
26012 | + *p = 0; | |
26013 | + val = match_token(perm, brperm, args); | |
26014 | + if (!val) { | |
26015 | + if (p) | |
26016 | + *p = '+'; | |
0c3ec466 | 26017 | + pr_warn("ignored branch permission %s\n", perm); |
1e00d052 AM |
26018 | + val = AuBrPerm_RO; |
26019 | + goto out; | |
26020 | + } | |
26021 | + if (!p) | |
26022 | + goto out; | |
26023 | + | |
076b876e AM |
26024 | + val |= br_attr_val(p + 1, brattr, args); |
26025 | + | |
26026 | + bad = 0; | |
86dc4139 | 26027 | + switch (val & AuBrPerm_Mask) { |
1e00d052 AM |
26028 | + case AuBrPerm_RO: |
26029 | + case AuBrPerm_RR: | |
076b876e AM |
26030 | + bad = val & AuBrWAttr_Mask; |
26031 | + val &= ~AuBrWAttr_Mask; | |
1e00d052 AM |
26032 | + break; |
26033 | + case AuBrPerm_RW: | |
076b876e AM |
26034 | + bad = val & AuBrRAttr_Mask; |
26035 | + val &= ~AuBrRAttr_Mask; | |
1e00d052 AM |
26036 | + break; |
26037 | + } | |
c1595e42 JR |
26038 | + |
26039 | + /* | |
26040 | + * 'unpin' attrib becomes meaningless since linux-3.18-rc1, but aufs | |
26041 | + * does not treat it as an error, just warning. | |
26042 | + * this is a tiny guard for the user operation. | |
26043 | + */ | |
26044 | + if (val & AuBrAttr_UNPIN) { | |
26045 | + bad |= AuBrAttr_UNPIN; | |
26046 | + val &= ~AuBrAttr_UNPIN; | |
26047 | + } | |
26048 | + | |
076b876e AM |
26049 | + if (unlikely(bad)) { |
26050 | + sz = au_do_optstr_br_attr(&attr, bad); | |
26051 | + AuDebugOn(!sz); | |
26052 | + pr_warn("ignored branch attribute %s\n", attr.a); | |
26053 | + } | |
1e00d052 AM |
26054 | + |
26055 | +out: | |
1facf9fc | 26056 | + return val; |
26057 | +} | |
26058 | + | |
076b876e | 26059 | +void au_optstr_br_perm(au_br_perm_str_t *str, int perm) |
1facf9fc | 26060 | +{ |
076b876e AM |
26061 | + au_br_perm_str_t attr; |
26062 | + const char *p; | |
26063 | + char *q; | |
1e00d052 AM |
26064 | + int sz; |
26065 | + | |
076b876e AM |
26066 | + q = str->a; |
26067 | + p = au_optstr(&perm, brperm); | |
26068 | + AuDebugOn(!p || !*p); | |
26069 | + sz = strlen(p); | |
26070 | + memcpy(q, p, sz + 1); | |
26071 | + q += sz; | |
1e00d052 | 26072 | + |
076b876e AM |
26073 | + sz = au_do_optstr_br_attr(&attr, perm); |
26074 | + if (sz) { | |
26075 | + *q++ = '+'; | |
26076 | + memcpy(q, attr.a, sz + 1); | |
1e00d052 AM |
26077 | + } |
26078 | + | |
076b876e | 26079 | + AuDebugOn(strlen(str->a) >= sizeof(str->a)); |
1facf9fc | 26080 | +} |
26081 | + | |
26082 | +/* ---------------------------------------------------------------------- */ | |
26083 | + | |
26084 | +static match_table_t udbalevel = { | |
26085 | + {AuOpt_UDBA_REVAL, "reval"}, | |
26086 | + {AuOpt_UDBA_NONE, "none"}, | |
4a4d8108 AM |
26087 | +#ifdef CONFIG_AUFS_HNOTIFY |
26088 | + {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */ | |
26089 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
26090 | + {AuOpt_UDBA_HNOTIFY, "fsnotify"}, | |
4a4d8108 | 26091 | +#endif |
1facf9fc | 26092 | +#endif |
26093 | + {-1, NULL} | |
26094 | +}; | |
26095 | + | |
4a4d8108 | 26096 | +static int noinline_for_stack udba_val(char *str) |
1facf9fc | 26097 | +{ |
26098 | + substring_t args[MAX_OPT_ARGS]; | |
26099 | + | |
7f207e10 | 26100 | + return match_token(str, udbalevel, args); |
1facf9fc | 26101 | +} |
26102 | + | |
26103 | +const char *au_optstr_udba(int udba) | |
26104 | +{ | |
076b876e | 26105 | + return au_parser_pattern(udba, udbalevel); |
1facf9fc | 26106 | +} |
26107 | + | |
26108 | +/* ---------------------------------------------------------------------- */ | |
26109 | + | |
26110 | +static match_table_t au_wbr_create_policy = { | |
26111 | + {AuWbrCreate_TDP, "tdp"}, | |
26112 | + {AuWbrCreate_TDP, "top-down-parent"}, | |
26113 | + {AuWbrCreate_RR, "rr"}, | |
26114 | + {AuWbrCreate_RR, "round-robin"}, | |
26115 | + {AuWbrCreate_MFS, "mfs"}, | |
26116 | + {AuWbrCreate_MFS, "most-free-space"}, | |
26117 | + {AuWbrCreate_MFSV, "mfs:%d"}, | |
26118 | + {AuWbrCreate_MFSV, "most-free-space:%d"}, | |
26119 | + | |
f2c43d5f AM |
26120 | + /* top-down regardless the parent, and then mfs */ |
26121 | + {AuWbrCreate_TDMFS, "tdmfs:%d"}, | |
26122 | + {AuWbrCreate_TDMFSV, "tdmfs:%d:%d"}, | |
26123 | + | |
1facf9fc | 26124 | + {AuWbrCreate_MFSRR, "mfsrr:%d"}, |
26125 | + {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"}, | |
26126 | + {AuWbrCreate_PMFS, "pmfs"}, | |
26127 | + {AuWbrCreate_PMFSV, "pmfs:%d"}, | |
392086de AM |
26128 | + {AuWbrCreate_PMFSRR, "pmfsrr:%d"}, |
26129 | + {AuWbrCreate_PMFSRRV, "pmfsrr:%d:%d"}, | |
1facf9fc | 26130 | + |
26131 | + {-1, NULL} | |
26132 | +}; | |
26133 | + | |
1facf9fc | 26134 | +static int au_wbr_mfs_wmark(substring_t *arg, char *str, |
26135 | + struct au_opt_wbr_create *create) | |
26136 | +{ | |
26137 | + int err; | |
26138 | + unsigned long long ull; | |
26139 | + | |
26140 | + err = 0; | |
a2654f78 | 26141 | + if (!match_u64(arg, &ull)) |
1facf9fc | 26142 | + create->mfsrr_watermark = ull; |
26143 | + else { | |
4a4d8108 | 26144 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 26145 | + err = -EINVAL; |
26146 | + } | |
26147 | + | |
26148 | + return err; | |
26149 | +} | |
26150 | + | |
26151 | +static int au_wbr_mfs_sec(substring_t *arg, char *str, | |
26152 | + struct au_opt_wbr_create *create) | |
26153 | +{ | |
26154 | + int n, err; | |
26155 | + | |
26156 | + err = 0; | |
027c5e7a | 26157 | + if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC) |
1facf9fc | 26158 | + create->mfs_second = n; |
26159 | + else { | |
4a4d8108 | 26160 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 26161 | + err = -EINVAL; |
26162 | + } | |
26163 | + | |
26164 | + return err; | |
26165 | +} | |
26166 | + | |
4a4d8108 AM |
26167 | +static int noinline_for_stack |
26168 | +au_wbr_create_val(char *str, struct au_opt_wbr_create *create) | |
1facf9fc | 26169 | +{ |
26170 | + int err, e; | |
26171 | + substring_t args[MAX_OPT_ARGS]; | |
26172 | + | |
26173 | + err = match_token(str, au_wbr_create_policy, args); | |
26174 | + create->wbr_create = err; | |
26175 | + switch (err) { | |
26176 | + case AuWbrCreate_MFSRRV: | |
f2c43d5f | 26177 | + case AuWbrCreate_TDMFSV: |
392086de | 26178 | + case AuWbrCreate_PMFSRRV: |
1facf9fc | 26179 | + e = au_wbr_mfs_wmark(&args[0], str, create); |
26180 | + if (!e) | |
26181 | + e = au_wbr_mfs_sec(&args[1], str, create); | |
26182 | + if (unlikely(e)) | |
26183 | + err = e; | |
26184 | + break; | |
26185 | + case AuWbrCreate_MFSRR: | |
f2c43d5f | 26186 | + case AuWbrCreate_TDMFS: |
392086de | 26187 | + case AuWbrCreate_PMFSRR: |
1facf9fc | 26188 | + e = au_wbr_mfs_wmark(&args[0], str, create); |
26189 | + if (unlikely(e)) { | |
26190 | + err = e; | |
26191 | + break; | |
26192 | + } | |
26193 | + /*FALLTHROUGH*/ | |
26194 | + case AuWbrCreate_MFS: | |
26195 | + case AuWbrCreate_PMFS: | |
027c5e7a | 26196 | + create->mfs_second = AUFS_MFS_DEF_SEC; |
1facf9fc | 26197 | + break; |
26198 | + case AuWbrCreate_MFSV: | |
26199 | + case AuWbrCreate_PMFSV: | |
26200 | + e = au_wbr_mfs_sec(&args[0], str, create); | |
26201 | + if (unlikely(e)) | |
26202 | + err = e; | |
26203 | + break; | |
26204 | + } | |
26205 | + | |
26206 | + return err; | |
26207 | +} | |
26208 | + | |
26209 | +const char *au_optstr_wbr_create(int wbr_create) | |
26210 | +{ | |
076b876e | 26211 | + return au_parser_pattern(wbr_create, au_wbr_create_policy); |
1facf9fc | 26212 | +} |
26213 | + | |
26214 | +static match_table_t au_wbr_copyup_policy = { | |
26215 | + {AuWbrCopyup_TDP, "tdp"}, | |
26216 | + {AuWbrCopyup_TDP, "top-down-parent"}, | |
26217 | + {AuWbrCopyup_BUP, "bup"}, | |
26218 | + {AuWbrCopyup_BUP, "bottom-up-parent"}, | |
26219 | + {AuWbrCopyup_BU, "bu"}, | |
26220 | + {AuWbrCopyup_BU, "bottom-up"}, | |
26221 | + {-1, NULL} | |
26222 | +}; | |
26223 | + | |
4a4d8108 | 26224 | +static int noinline_for_stack au_wbr_copyup_val(char *str) |
1facf9fc | 26225 | +{ |
26226 | + substring_t args[MAX_OPT_ARGS]; | |
26227 | + | |
26228 | + return match_token(str, au_wbr_copyup_policy, args); | |
26229 | +} | |
26230 | + | |
26231 | +const char *au_optstr_wbr_copyup(int wbr_copyup) | |
26232 | +{ | |
076b876e | 26233 | + return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy); |
1facf9fc | 26234 | +} |
26235 | + | |
26236 | +/* ---------------------------------------------------------------------- */ | |
26237 | + | |
26238 | +static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; | |
26239 | + | |
26240 | +static void dump_opts(struct au_opts *opts) | |
26241 | +{ | |
26242 | +#ifdef CONFIG_AUFS_DEBUG | |
26243 | + /* reduce stack space */ | |
26244 | + union { | |
26245 | + struct au_opt_add *add; | |
26246 | + struct au_opt_del *del; | |
26247 | + struct au_opt_mod *mod; | |
26248 | + struct au_opt_xino *xino; | |
26249 | + struct au_opt_xino_itrunc *xino_itrunc; | |
26250 | + struct au_opt_wbr_create *create; | |
26251 | + } u; | |
26252 | + struct au_opt *opt; | |
26253 | + | |
26254 | + opt = opts->opt; | |
26255 | + while (opt->type != Opt_tail) { | |
26256 | + switch (opt->type) { | |
26257 | + case Opt_add: | |
26258 | + u.add = &opt->add; | |
26259 | + AuDbg("add {b%d, %s, 0x%x, %p}\n", | |
26260 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26261 | + u.add->path.dentry); | |
26262 | + break; | |
26263 | + case Opt_del: | |
26264 | + case Opt_idel: | |
26265 | + u.del = &opt->del; | |
26266 | + AuDbg("del {%s, %p}\n", | |
26267 | + u.del->pathname, u.del->h_path.dentry); | |
26268 | + break; | |
26269 | + case Opt_mod: | |
26270 | + case Opt_imod: | |
26271 | + u.mod = &opt->mod; | |
26272 | + AuDbg("mod {%s, 0x%x, %p}\n", | |
26273 | + u.mod->path, u.mod->perm, u.mod->h_root); | |
26274 | + break; | |
26275 | + case Opt_append: | |
26276 | + u.add = &opt->add; | |
26277 | + AuDbg("append {b%d, %s, 0x%x, %p}\n", | |
26278 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26279 | + u.add->path.dentry); | |
26280 | + break; | |
26281 | + case Opt_prepend: | |
26282 | + u.add = &opt->add; | |
26283 | + AuDbg("prepend {b%d, %s, 0x%x, %p}\n", | |
26284 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26285 | + u.add->path.dentry); | |
26286 | + break; | |
26287 | + case Opt_dirwh: | |
26288 | + AuDbg("dirwh %d\n", opt->dirwh); | |
26289 | + break; | |
26290 | + case Opt_rdcache: | |
26291 | + AuDbg("rdcache %d\n", opt->rdcache); | |
26292 | + break; | |
26293 | + case Opt_rdblk: | |
26294 | + AuDbg("rdblk %u\n", opt->rdblk); | |
26295 | + break; | |
dece6358 AM |
26296 | + case Opt_rdblk_def: |
26297 | + AuDbg("rdblk_def\n"); | |
26298 | + break; | |
1facf9fc | 26299 | + case Opt_rdhash: |
26300 | + AuDbg("rdhash %u\n", opt->rdhash); | |
26301 | + break; | |
dece6358 AM |
26302 | + case Opt_rdhash_def: |
26303 | + AuDbg("rdhash_def\n"); | |
26304 | + break; | |
1facf9fc | 26305 | + case Opt_xino: |
26306 | + u.xino = &opt->xino; | |
523b37e3 | 26307 | + AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file); |
1facf9fc | 26308 | + break; |
26309 | + case Opt_trunc_xino: | |
26310 | + AuLabel(trunc_xino); | |
26311 | + break; | |
26312 | + case Opt_notrunc_xino: | |
26313 | + AuLabel(notrunc_xino); | |
26314 | + break; | |
26315 | + case Opt_trunc_xino_path: | |
26316 | + case Opt_itrunc_xino: | |
26317 | + u.xino_itrunc = &opt->xino_itrunc; | |
26318 | + AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex); | |
26319 | + break; | |
1facf9fc | 26320 | + case Opt_noxino: |
26321 | + AuLabel(noxino); | |
26322 | + break; | |
26323 | + case Opt_trunc_xib: | |
26324 | + AuLabel(trunc_xib); | |
26325 | + break; | |
26326 | + case Opt_notrunc_xib: | |
26327 | + AuLabel(notrunc_xib); | |
26328 | + break; | |
dece6358 AM |
26329 | + case Opt_shwh: |
26330 | + AuLabel(shwh); | |
26331 | + break; | |
26332 | + case Opt_noshwh: | |
26333 | + AuLabel(noshwh); | |
26334 | + break; | |
076b876e AM |
26335 | + case Opt_dirperm1: |
26336 | + AuLabel(dirperm1); | |
26337 | + break; | |
26338 | + case Opt_nodirperm1: | |
26339 | + AuLabel(nodirperm1); | |
26340 | + break; | |
1facf9fc | 26341 | + case Opt_plink: |
26342 | + AuLabel(plink); | |
26343 | + break; | |
26344 | + case Opt_noplink: | |
26345 | + AuLabel(noplink); | |
26346 | + break; | |
26347 | + case Opt_list_plink: | |
26348 | + AuLabel(list_plink); | |
26349 | + break; | |
26350 | + case Opt_udba: | |
26351 | + AuDbg("udba %d, %s\n", | |
26352 | + opt->udba, au_optstr_udba(opt->udba)); | |
26353 | + break; | |
4a4d8108 AM |
26354 | + case Opt_dio: |
26355 | + AuLabel(dio); | |
26356 | + break; | |
26357 | + case Opt_nodio: | |
26358 | + AuLabel(nodio); | |
26359 | + break; | |
1facf9fc | 26360 | + case Opt_diropq_a: |
26361 | + AuLabel(diropq_a); | |
26362 | + break; | |
26363 | + case Opt_diropq_w: | |
26364 | + AuLabel(diropq_w); | |
26365 | + break; | |
26366 | + case Opt_warn_perm: | |
26367 | + AuLabel(warn_perm); | |
26368 | + break; | |
26369 | + case Opt_nowarn_perm: | |
26370 | + AuLabel(nowarn_perm); | |
26371 | + break; | |
1facf9fc | 26372 | + case Opt_verbose: |
26373 | + AuLabel(verbose); | |
26374 | + break; | |
26375 | + case Opt_noverbose: | |
26376 | + AuLabel(noverbose); | |
26377 | + break; | |
26378 | + case Opt_sum: | |
26379 | + AuLabel(sum); | |
26380 | + break; | |
26381 | + case Opt_nosum: | |
26382 | + AuLabel(nosum); | |
26383 | + break; | |
26384 | + case Opt_wsum: | |
26385 | + AuLabel(wsum); | |
26386 | + break; | |
26387 | + case Opt_wbr_create: | |
26388 | + u.create = &opt->wbr_create; | |
26389 | + AuDbg("create %d, %s\n", u.create->wbr_create, | |
26390 | + au_optstr_wbr_create(u.create->wbr_create)); | |
26391 | + switch (u.create->wbr_create) { | |
26392 | + case AuWbrCreate_MFSV: | |
26393 | + case AuWbrCreate_PMFSV: | |
26394 | + AuDbg("%d sec\n", u.create->mfs_second); | |
26395 | + break; | |
26396 | + case AuWbrCreate_MFSRR: | |
f2c43d5f | 26397 | + case AuWbrCreate_TDMFS: |
1facf9fc | 26398 | + AuDbg("%llu watermark\n", |
26399 | + u.create->mfsrr_watermark); | |
26400 | + break; | |
26401 | + case AuWbrCreate_MFSRRV: | |
f2c43d5f | 26402 | + case AuWbrCreate_TDMFSV: |
392086de | 26403 | + case AuWbrCreate_PMFSRRV: |
1facf9fc | 26404 | + AuDbg("%llu watermark, %d sec\n", |
26405 | + u.create->mfsrr_watermark, | |
26406 | + u.create->mfs_second); | |
26407 | + break; | |
26408 | + } | |
26409 | + break; | |
26410 | + case Opt_wbr_copyup: | |
26411 | + AuDbg("copyup %d, %s\n", opt->wbr_copyup, | |
26412 | + au_optstr_wbr_copyup(opt->wbr_copyup)); | |
26413 | + break; | |
076b876e AM |
26414 | + case Opt_fhsm_sec: |
26415 | + AuDbg("fhsm_sec %u\n", opt->fhsm_second); | |
26416 | + break; | |
8b6a4947 AM |
26417 | + case Opt_dirren: |
26418 | + AuLabel(dirren); | |
26419 | + break; | |
26420 | + case Opt_nodirren: | |
26421 | + AuLabel(nodirren); | |
26422 | + break; | |
c1595e42 JR |
26423 | + case Opt_acl: |
26424 | + AuLabel(acl); | |
26425 | + break; | |
26426 | + case Opt_noacl: | |
26427 | + AuLabel(noacl); | |
26428 | + break; | |
1facf9fc | 26429 | + default: |
26430 | + BUG(); | |
26431 | + } | |
26432 | + opt++; | |
26433 | + } | |
26434 | +#endif | |
26435 | +} | |
26436 | + | |
26437 | +void au_opts_free(struct au_opts *opts) | |
26438 | +{ | |
26439 | + struct au_opt *opt; | |
26440 | + | |
26441 | + opt = opts->opt; | |
26442 | + while (opt->type != Opt_tail) { | |
26443 | + switch (opt->type) { | |
26444 | + case Opt_add: | |
26445 | + case Opt_append: | |
26446 | + case Opt_prepend: | |
26447 | + path_put(&opt->add.path); | |
26448 | + break; | |
26449 | + case Opt_del: | |
26450 | + case Opt_idel: | |
26451 | + path_put(&opt->del.h_path); | |
26452 | + break; | |
26453 | + case Opt_mod: | |
26454 | + case Opt_imod: | |
26455 | + dput(opt->mod.h_root); | |
26456 | + break; | |
26457 | + case Opt_xino: | |
26458 | + fput(opt->xino.file); | |
26459 | + break; | |
26460 | + } | |
26461 | + opt++; | |
26462 | + } | |
26463 | +} | |
26464 | + | |
26465 | +static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags, | |
26466 | + aufs_bindex_t bindex) | |
26467 | +{ | |
26468 | + int err; | |
26469 | + struct au_opt_add *add = &opt->add; | |
26470 | + char *p; | |
26471 | + | |
26472 | + add->bindex = bindex; | |
1e00d052 | 26473 | + add->perm = AuBrPerm_RO; |
1facf9fc | 26474 | + add->pathname = opt_str; |
26475 | + p = strchr(opt_str, '='); | |
26476 | + if (p) { | |
26477 | + *p++ = 0; | |
26478 | + if (*p) | |
26479 | + add->perm = br_perm_val(p); | |
26480 | + } | |
26481 | + | |
26482 | + err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path); | |
26483 | + if (!err) { | |
26484 | + if (!p) { | |
26485 | + add->perm = AuBrPerm_RO; | |
26486 | + if (au_test_fs_rr(add->path.dentry->d_sb)) | |
26487 | + add->perm = AuBrPerm_RR; | |
2121bcd9 | 26488 | + else if (!bindex && !(sb_flags & SB_RDONLY)) |
1facf9fc | 26489 | + add->perm = AuBrPerm_RW; |
26490 | + } | |
26491 | + opt->type = Opt_add; | |
26492 | + goto out; | |
26493 | + } | |
4a4d8108 | 26494 | + pr_err("lookup failed %s (%d)\n", add->pathname, err); |
1facf9fc | 26495 | + err = -EINVAL; |
26496 | + | |
4f0767ce | 26497 | +out: |
1facf9fc | 26498 | + return err; |
26499 | +} | |
26500 | + | |
26501 | +static int au_opts_parse_del(struct au_opt_del *del, substring_t args[]) | |
26502 | +{ | |
26503 | + int err; | |
26504 | + | |
26505 | + del->pathname = args[0].from; | |
26506 | + AuDbg("del path %s\n", del->pathname); | |
26507 | + | |
26508 | + err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path); | |
26509 | + if (unlikely(err)) | |
4a4d8108 | 26510 | + pr_err("lookup failed %s (%d)\n", del->pathname, err); |
1facf9fc | 26511 | + |
26512 | + return err; | |
26513 | +} | |
26514 | + | |
26515 | +#if 0 /* reserved for future use */ | |
26516 | +static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex, | |
26517 | + struct au_opt_del *del, substring_t args[]) | |
26518 | +{ | |
26519 | + int err; | |
26520 | + struct dentry *root; | |
26521 | + | |
26522 | + err = -EINVAL; | |
26523 | + root = sb->s_root; | |
26524 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26525 | + if (bindex < 0 || au_sbbot(sb) < bindex) { |
4a4d8108 | 26526 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 26527 | + goto out; |
26528 | + } | |
26529 | + | |
26530 | + err = 0; | |
26531 | + del->h_path.dentry = dget(au_h_dptr(root, bindex)); | |
26532 | + del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex)); | |
26533 | + | |
4f0767ce | 26534 | +out: |
1facf9fc | 26535 | + aufs_read_unlock(root, !AuLock_IR); |
26536 | + return err; | |
26537 | +} | |
26538 | +#endif | |
26539 | + | |
4a4d8108 AM |
26540 | +static int noinline_for_stack |
26541 | +au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[]) | |
1facf9fc | 26542 | +{ |
26543 | + int err; | |
26544 | + struct path path; | |
26545 | + char *p; | |
26546 | + | |
26547 | + err = -EINVAL; | |
26548 | + mod->path = args[0].from; | |
26549 | + p = strchr(mod->path, '='); | |
26550 | + if (unlikely(!p)) { | |
acd2b654 | 26551 | + pr_err("no permission %s\n", args[0].from); |
1facf9fc | 26552 | + goto out; |
26553 | + } | |
26554 | + | |
26555 | + *p++ = 0; | |
26556 | + err = vfsub_kern_path(mod->path, lkup_dirflags, &path); | |
26557 | + if (unlikely(err)) { | |
4a4d8108 | 26558 | + pr_err("lookup failed %s (%d)\n", mod->path, err); |
1facf9fc | 26559 | + goto out; |
26560 | + } | |
26561 | + | |
26562 | + mod->perm = br_perm_val(p); | |
26563 | + AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p); | |
26564 | + mod->h_root = dget(path.dentry); | |
26565 | + path_put(&path); | |
26566 | + | |
4f0767ce | 26567 | +out: |
1facf9fc | 26568 | + return err; |
26569 | +} | |
26570 | + | |
26571 | +#if 0 /* reserved for future use */ | |
26572 | +static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex, | |
26573 | + struct au_opt_mod *mod, substring_t args[]) | |
26574 | +{ | |
26575 | + int err; | |
26576 | + struct dentry *root; | |
26577 | + | |
26578 | + err = -EINVAL; | |
26579 | + root = sb->s_root; | |
26580 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26581 | + if (bindex < 0 || au_sbbot(sb) < bindex) { |
4a4d8108 | 26582 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 26583 | + goto out; |
26584 | + } | |
26585 | + | |
26586 | + err = 0; | |
26587 | + mod->perm = br_perm_val(args[1].from); | |
26588 | + AuDbg("mod path %s, perm 0x%x, %s\n", | |
26589 | + mod->path, mod->perm, args[1].from); | |
26590 | + mod->h_root = dget(au_h_dptr(root, bindex)); | |
26591 | + | |
4f0767ce | 26592 | +out: |
1facf9fc | 26593 | + aufs_read_unlock(root, !AuLock_IR); |
26594 | + return err; | |
26595 | +} | |
26596 | +#endif | |
26597 | + | |
26598 | +static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino, | |
26599 | + substring_t args[]) | |
26600 | +{ | |
26601 | + int err; | |
26602 | + struct file *file; | |
26603 | + | |
83b672a5 | 26604 | + file = au_xino_create(sb, args[0].from, /*silent*/0, /*wbrtop*/0); |
1facf9fc | 26605 | + err = PTR_ERR(file); |
26606 | + if (IS_ERR(file)) | |
26607 | + goto out; | |
26608 | + | |
26609 | + err = -EINVAL; | |
2000de60 | 26610 | + if (unlikely(file->f_path.dentry->d_sb == sb)) { |
1facf9fc | 26611 | + fput(file); |
4a4d8108 | 26612 | + pr_err("%s must be outside\n", args[0].from); |
1facf9fc | 26613 | + goto out; |
26614 | + } | |
26615 | + | |
26616 | + err = 0; | |
26617 | + xino->file = file; | |
26618 | + xino->path = args[0].from; | |
26619 | + | |
4f0767ce | 26620 | +out: |
1facf9fc | 26621 | + return err; |
26622 | +} | |
26623 | + | |
4a4d8108 AM |
26624 | +static int noinline_for_stack |
26625 | +au_opts_parse_xino_itrunc_path(struct super_block *sb, | |
26626 | + struct au_opt_xino_itrunc *xino_itrunc, | |
26627 | + substring_t args[]) | |
1facf9fc | 26628 | +{ |
26629 | + int err; | |
5afbbe0d | 26630 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 26631 | + struct path path; |
26632 | + struct dentry *root; | |
26633 | + | |
26634 | + err = vfsub_kern_path(args[0].from, lkup_dirflags, &path); | |
26635 | + if (unlikely(err)) { | |
4a4d8108 | 26636 | + pr_err("lookup failed %s (%d)\n", args[0].from, err); |
1facf9fc | 26637 | + goto out; |
26638 | + } | |
26639 | + | |
26640 | + xino_itrunc->bindex = -1; | |
26641 | + root = sb->s_root; | |
26642 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d AM |
26643 | + bbot = au_sbbot(sb); |
26644 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
1facf9fc | 26645 | + if (au_h_dptr(root, bindex) == path.dentry) { |
26646 | + xino_itrunc->bindex = bindex; | |
26647 | + break; | |
26648 | + } | |
26649 | + } | |
26650 | + aufs_read_unlock(root, !AuLock_IR); | |
26651 | + path_put(&path); | |
26652 | + | |
26653 | + if (unlikely(xino_itrunc->bindex < 0)) { | |
4a4d8108 | 26654 | + pr_err("no such branch %s\n", args[0].from); |
1facf9fc | 26655 | + err = -EINVAL; |
26656 | + } | |
26657 | + | |
4f0767ce | 26658 | +out: |
1facf9fc | 26659 | + return err; |
26660 | +} | |
26661 | + | |
26662 | +/* called without aufs lock */ | |
26663 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts) | |
26664 | +{ | |
26665 | + int err, n, token; | |
26666 | + aufs_bindex_t bindex; | |
26667 | + unsigned char skipped; | |
26668 | + struct dentry *root; | |
26669 | + struct au_opt *opt, *opt_tail; | |
26670 | + char *opt_str; | |
26671 | + /* reduce the stack space */ | |
26672 | + union { | |
26673 | + struct au_opt_xino_itrunc *xino_itrunc; | |
26674 | + struct au_opt_wbr_create *create; | |
26675 | + } u; | |
26676 | + struct { | |
26677 | + substring_t args[MAX_OPT_ARGS]; | |
26678 | + } *a; | |
26679 | + | |
26680 | + err = -ENOMEM; | |
26681 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
26682 | + if (unlikely(!a)) | |
26683 | + goto out; | |
26684 | + | |
26685 | + root = sb->s_root; | |
26686 | + err = 0; | |
26687 | + bindex = 0; | |
26688 | + opt = opts->opt; | |
26689 | + opt_tail = opt + opts->max_opt - 1; | |
26690 | + opt->type = Opt_tail; | |
26691 | + while (!err && (opt_str = strsep(&str, ",")) && *opt_str) { | |
26692 | + err = -EINVAL; | |
26693 | + skipped = 0; | |
26694 | + token = match_token(opt_str, options, a->args); | |
26695 | + switch (token) { | |
26696 | + case Opt_br: | |
26697 | + err = 0; | |
26698 | + while (!err && (opt_str = strsep(&a->args[0].from, ":")) | |
26699 | + && *opt_str) { | |
26700 | + err = opt_add(opt, opt_str, opts->sb_flags, | |
26701 | + bindex++); | |
26702 | + if (unlikely(!err && ++opt > opt_tail)) { | |
26703 | + err = -E2BIG; | |
26704 | + break; | |
26705 | + } | |
26706 | + opt->type = Opt_tail; | |
26707 | + skipped = 1; | |
26708 | + } | |
26709 | + break; | |
26710 | + case Opt_add: | |
26711 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26712 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26713 | + break; |
26714 | + } | |
26715 | + bindex = n; | |
26716 | + err = opt_add(opt, a->args[1].from, opts->sb_flags, | |
26717 | + bindex); | |
26718 | + if (!err) | |
26719 | + opt->type = token; | |
26720 | + break; | |
26721 | + case Opt_append: | |
26722 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
26723 | + /*dummy bindex*/1); | |
26724 | + if (!err) | |
26725 | + opt->type = token; | |
26726 | + break; | |
26727 | + case Opt_prepend: | |
26728 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
26729 | + /*bindex*/0); | |
26730 | + if (!err) | |
26731 | + opt->type = token; | |
26732 | + break; | |
26733 | + case Opt_del: | |
26734 | + err = au_opts_parse_del(&opt->del, a->args); | |
26735 | + if (!err) | |
26736 | + opt->type = token; | |
26737 | + break; | |
26738 | +#if 0 /* reserved for future use */ | |
26739 | + case Opt_idel: | |
26740 | + del->pathname = "(indexed)"; | |
26741 | + if (unlikely(match_int(&args[0], &n))) { | |
4a4d8108 | 26742 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26743 | + break; |
26744 | + } | |
26745 | + err = au_opts_parse_idel(sb, n, &opt->del, a->args); | |
26746 | + if (!err) | |
26747 | + opt->type = token; | |
26748 | + break; | |
26749 | +#endif | |
26750 | + case Opt_mod: | |
26751 | + err = au_opts_parse_mod(&opt->mod, a->args); | |
26752 | + if (!err) | |
26753 | + opt->type = token; | |
26754 | + break; | |
26755 | +#ifdef IMOD /* reserved for future use */ | |
26756 | + case Opt_imod: | |
26757 | + u.mod->path = "(indexed)"; | |
26758 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26759 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26760 | + break; |
26761 | + } | |
26762 | + err = au_opts_parse_imod(sb, n, &opt->mod, a->args); | |
26763 | + if (!err) | |
26764 | + opt->type = token; | |
26765 | + break; | |
26766 | +#endif | |
26767 | + case Opt_xino: | |
26768 | + err = au_opts_parse_xino(sb, &opt->xino, a->args); | |
26769 | + if (!err) | |
26770 | + opt->type = token; | |
26771 | + break; | |
26772 | + | |
26773 | + case Opt_trunc_xino_path: | |
26774 | + err = au_opts_parse_xino_itrunc_path | |
26775 | + (sb, &opt->xino_itrunc, a->args); | |
26776 | + if (!err) | |
26777 | + opt->type = token; | |
26778 | + break; | |
26779 | + | |
26780 | + case Opt_itrunc_xino: | |
26781 | + u.xino_itrunc = &opt->xino_itrunc; | |
26782 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26783 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26784 | + break; |
26785 | + } | |
26786 | + u.xino_itrunc->bindex = n; | |
26787 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26788 | + if (n < 0 || au_sbbot(sb) < n) { |
4a4d8108 | 26789 | + pr_err("out of bounds, %d\n", n); |
1facf9fc | 26790 | + aufs_read_unlock(root, !AuLock_IR); |
26791 | + break; | |
26792 | + } | |
26793 | + aufs_read_unlock(root, !AuLock_IR); | |
26794 | + err = 0; | |
26795 | + opt->type = token; | |
26796 | + break; | |
26797 | + | |
26798 | + case Opt_dirwh: | |
26799 | + if (unlikely(match_int(&a->args[0], &opt->dirwh))) | |
26800 | + break; | |
26801 | + err = 0; | |
26802 | + opt->type = token; | |
26803 | + break; | |
26804 | + | |
26805 | + case Opt_rdcache: | |
027c5e7a AM |
26806 | + if (unlikely(match_int(&a->args[0], &n))) { |
26807 | + pr_err("bad integer in %s\n", opt_str); | |
1facf9fc | 26808 | + break; |
027c5e7a AM |
26809 | + } |
26810 | + if (unlikely(n > AUFS_RDCACHE_MAX)) { | |
26811 | + pr_err("rdcache must be smaller than %d\n", | |
26812 | + AUFS_RDCACHE_MAX); | |
26813 | + break; | |
26814 | + } | |
26815 | + opt->rdcache = n; | |
1facf9fc | 26816 | + err = 0; |
26817 | + opt->type = token; | |
26818 | + break; | |
26819 | + case Opt_rdblk: | |
26820 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 26821 | + || n < 0 |
1facf9fc | 26822 | + || n > KMALLOC_MAX_SIZE)) { |
4a4d8108 | 26823 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26824 | + break; |
26825 | + } | |
1308ab2a | 26826 | + if (unlikely(n && n < NAME_MAX)) { |
4a4d8108 AM |
26827 | + pr_err("rdblk must be larger than %d\n", |
26828 | + NAME_MAX); | |
1facf9fc | 26829 | + break; |
26830 | + } | |
26831 | + opt->rdblk = n; | |
26832 | + err = 0; | |
26833 | + opt->type = token; | |
26834 | + break; | |
26835 | + case Opt_rdhash: | |
26836 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 26837 | + || n < 0 |
1facf9fc | 26838 | + || n * sizeof(struct hlist_head) |
26839 | + > KMALLOC_MAX_SIZE)) { | |
4a4d8108 | 26840 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26841 | + break; |
26842 | + } | |
26843 | + opt->rdhash = n; | |
26844 | + err = 0; | |
26845 | + opt->type = token; | |
26846 | + break; | |
26847 | + | |
26848 | + case Opt_trunc_xino: | |
26849 | + case Opt_notrunc_xino: | |
26850 | + case Opt_noxino: | |
26851 | + case Opt_trunc_xib: | |
26852 | + case Opt_notrunc_xib: | |
dece6358 AM |
26853 | + case Opt_shwh: |
26854 | + case Opt_noshwh: | |
076b876e AM |
26855 | + case Opt_dirperm1: |
26856 | + case Opt_nodirperm1: | |
1facf9fc | 26857 | + case Opt_plink: |
26858 | + case Opt_noplink: | |
26859 | + case Opt_list_plink: | |
4a4d8108 AM |
26860 | + case Opt_dio: |
26861 | + case Opt_nodio: | |
1facf9fc | 26862 | + case Opt_diropq_a: |
26863 | + case Opt_diropq_w: | |
26864 | + case Opt_warn_perm: | |
26865 | + case Opt_nowarn_perm: | |
1facf9fc | 26866 | + case Opt_verbose: |
26867 | + case Opt_noverbose: | |
26868 | + case Opt_sum: | |
26869 | + case Opt_nosum: | |
26870 | + case Opt_wsum: | |
dece6358 AM |
26871 | + case Opt_rdblk_def: |
26872 | + case Opt_rdhash_def: | |
8b6a4947 AM |
26873 | + case Opt_dirren: |
26874 | + case Opt_nodirren: | |
c1595e42 JR |
26875 | + case Opt_acl: |
26876 | + case Opt_noacl: | |
1facf9fc | 26877 | + err = 0; |
26878 | + opt->type = token; | |
26879 | + break; | |
26880 | + | |
26881 | + case Opt_udba: | |
26882 | + opt->udba = udba_val(a->args[0].from); | |
26883 | + if (opt->udba >= 0) { | |
26884 | + err = 0; | |
26885 | + opt->type = token; | |
26886 | + } else | |
4a4d8108 | 26887 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26888 | + break; |
26889 | + | |
26890 | + case Opt_wbr_create: | |
26891 | + u.create = &opt->wbr_create; | |
26892 | + u.create->wbr_create | |
26893 | + = au_wbr_create_val(a->args[0].from, u.create); | |
26894 | + if (u.create->wbr_create >= 0) { | |
26895 | + err = 0; | |
26896 | + opt->type = token; | |
26897 | + } else | |
4a4d8108 | 26898 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26899 | + break; |
26900 | + case Opt_wbr_copyup: | |
26901 | + opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from); | |
26902 | + if (opt->wbr_copyup >= 0) { | |
26903 | + err = 0; | |
26904 | + opt->type = token; | |
26905 | + } else | |
4a4d8108 | 26906 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26907 | + break; |
26908 | + | |
076b876e AM |
26909 | + case Opt_fhsm_sec: |
26910 | + if (unlikely(match_int(&a->args[0], &n) | |
26911 | + || n < 0)) { | |
26912 | + pr_err("bad integer in %s\n", opt_str); | |
26913 | + break; | |
26914 | + } | |
26915 | + if (sysaufs_brs) { | |
26916 | + opt->fhsm_second = n; | |
26917 | + opt->type = token; | |
26918 | + } else | |
26919 | + pr_warn("ignored %s\n", opt_str); | |
26920 | + err = 0; | |
26921 | + break; | |
26922 | + | |
1facf9fc | 26923 | + case Opt_ignore: |
0c3ec466 | 26924 | + pr_warn("ignored %s\n", opt_str); |
1facf9fc | 26925 | + /*FALLTHROUGH*/ |
26926 | + case Opt_ignore_silent: | |
26927 | + skipped = 1; | |
26928 | + err = 0; | |
26929 | + break; | |
26930 | + case Opt_err: | |
4a4d8108 | 26931 | + pr_err("unknown option %s\n", opt_str); |
1facf9fc | 26932 | + break; |
26933 | + } | |
26934 | + | |
26935 | + if (!err && !skipped) { | |
26936 | + if (unlikely(++opt > opt_tail)) { | |
26937 | + err = -E2BIG; | |
26938 | + opt--; | |
26939 | + opt->type = Opt_tail; | |
26940 | + break; | |
26941 | + } | |
26942 | + opt->type = Opt_tail; | |
26943 | + } | |
26944 | + } | |
26945 | + | |
9f237c51 | 26946 | + au_kfree_rcu(a); |
1facf9fc | 26947 | + dump_opts(opts); |
26948 | + if (unlikely(err)) | |
26949 | + au_opts_free(opts); | |
26950 | + | |
4f0767ce | 26951 | +out: |
1facf9fc | 26952 | + return err; |
26953 | +} | |
26954 | + | |
26955 | +static int au_opt_wbr_create(struct super_block *sb, | |
26956 | + struct au_opt_wbr_create *create) | |
26957 | +{ | |
26958 | + int err; | |
26959 | + struct au_sbinfo *sbinfo; | |
26960 | + | |
dece6358 AM |
26961 | + SiMustWriteLock(sb); |
26962 | + | |
1facf9fc | 26963 | + err = 1; /* handled */ |
26964 | + sbinfo = au_sbi(sb); | |
26965 | + if (sbinfo->si_wbr_create_ops->fin) { | |
26966 | + err = sbinfo->si_wbr_create_ops->fin(sb); | |
26967 | + if (!err) | |
26968 | + err = 1; | |
26969 | + } | |
26970 | + | |
26971 | + sbinfo->si_wbr_create = create->wbr_create; | |
26972 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create; | |
26973 | + switch (create->wbr_create) { | |
26974 | + case AuWbrCreate_MFSRRV: | |
26975 | + case AuWbrCreate_MFSRR: | |
f2c43d5f AM |
26976 | + case AuWbrCreate_TDMFS: |
26977 | + case AuWbrCreate_TDMFSV: | |
392086de AM |
26978 | + case AuWbrCreate_PMFSRR: |
26979 | + case AuWbrCreate_PMFSRRV: | |
1facf9fc | 26980 | + sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark; |
26981 | + /*FALLTHROUGH*/ | |
26982 | + case AuWbrCreate_MFS: | |
26983 | + case AuWbrCreate_MFSV: | |
26984 | + case AuWbrCreate_PMFS: | |
26985 | + case AuWbrCreate_PMFSV: | |
e49829fe JR |
26986 | + sbinfo->si_wbr_mfs.mfs_expire |
26987 | + = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC); | |
1facf9fc | 26988 | + break; |
26989 | + } | |
26990 | + | |
26991 | + if (sbinfo->si_wbr_create_ops->init) | |
26992 | + sbinfo->si_wbr_create_ops->init(sb); /* ignore */ | |
26993 | + | |
26994 | + return err; | |
26995 | +} | |
26996 | + | |
26997 | +/* | |
26998 | + * returns, | |
26999 | + * plus: processed without an error | |
27000 | + * zero: unprocessed | |
27001 | + */ | |
27002 | +static int au_opt_simple(struct super_block *sb, struct au_opt *opt, | |
27003 | + struct au_opts *opts) | |
27004 | +{ | |
27005 | + int err; | |
27006 | + struct au_sbinfo *sbinfo; | |
27007 | + | |
dece6358 AM |
27008 | + SiMustWriteLock(sb); |
27009 | + | |
1facf9fc | 27010 | + err = 1; /* handled */ |
27011 | + sbinfo = au_sbi(sb); | |
27012 | + switch (opt->type) { | |
27013 | + case Opt_udba: | |
27014 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; | |
27015 | + sbinfo->si_mntflags |= opt->udba; | |
27016 | + opts->given_udba |= opt->udba; | |
27017 | + break; | |
27018 | + | |
27019 | + case Opt_plink: | |
27020 | + au_opt_set(sbinfo->si_mntflags, PLINK); | |
27021 | + break; | |
27022 | + case Opt_noplink: | |
27023 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
e49829fe | 27024 | + au_plink_put(sb, /*verbose*/1); |
1facf9fc | 27025 | + au_opt_clr(sbinfo->si_mntflags, PLINK); |
27026 | + break; | |
27027 | + case Opt_list_plink: | |
27028 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
27029 | + au_plink_list(sb); | |
27030 | + break; | |
27031 | + | |
4a4d8108 AM |
27032 | + case Opt_dio: |
27033 | + au_opt_set(sbinfo->si_mntflags, DIO); | |
27034 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
27035 | + break; | |
27036 | + case Opt_nodio: | |
27037 | + au_opt_clr(sbinfo->si_mntflags, DIO); | |
27038 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
27039 | + break; | |
27040 | + | |
076b876e AM |
27041 | + case Opt_fhsm_sec: |
27042 | + au_fhsm_set(sbinfo, opt->fhsm_second); | |
27043 | + break; | |
27044 | + | |
1facf9fc | 27045 | + case Opt_diropq_a: |
27046 | + au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
27047 | + break; | |
27048 | + case Opt_diropq_w: | |
27049 | + au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
27050 | + break; | |
27051 | + | |
27052 | + case Opt_warn_perm: | |
27053 | + au_opt_set(sbinfo->si_mntflags, WARN_PERM); | |
27054 | + break; | |
27055 | + case Opt_nowarn_perm: | |
27056 | + au_opt_clr(sbinfo->si_mntflags, WARN_PERM); | |
27057 | + break; | |
27058 | + | |
1facf9fc | 27059 | + case Opt_verbose: |
27060 | + au_opt_set(sbinfo->si_mntflags, VERBOSE); | |
27061 | + break; | |
27062 | + case Opt_noverbose: | |
27063 | + au_opt_clr(sbinfo->si_mntflags, VERBOSE); | |
27064 | + break; | |
27065 | + | |
27066 | + case Opt_sum: | |
27067 | + au_opt_set(sbinfo->si_mntflags, SUM); | |
27068 | + break; | |
27069 | + case Opt_wsum: | |
27070 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
27071 | + au_opt_set(sbinfo->si_mntflags, SUM_W); | |
eca34b5c | 27072 | + break; |
1facf9fc | 27073 | + case Opt_nosum: |
27074 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
27075 | + au_opt_clr(sbinfo->si_mntflags, SUM_W); | |
27076 | + break; | |
27077 | + | |
27078 | + case Opt_wbr_create: | |
27079 | + err = au_opt_wbr_create(sb, &opt->wbr_create); | |
27080 | + break; | |
27081 | + case Opt_wbr_copyup: | |
27082 | + sbinfo->si_wbr_copyup = opt->wbr_copyup; | |
27083 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup; | |
27084 | + break; | |
27085 | + | |
27086 | + case Opt_dirwh: | |
27087 | + sbinfo->si_dirwh = opt->dirwh; | |
27088 | + break; | |
27089 | + | |
27090 | + case Opt_rdcache: | |
e49829fe JR |
27091 | + sbinfo->si_rdcache |
27092 | + = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC); | |
1facf9fc | 27093 | + break; |
27094 | + case Opt_rdblk: | |
27095 | + sbinfo->si_rdblk = opt->rdblk; | |
27096 | + break; | |
dece6358 AM |
27097 | + case Opt_rdblk_def: |
27098 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; | |
27099 | + break; | |
1facf9fc | 27100 | + case Opt_rdhash: |
27101 | + sbinfo->si_rdhash = opt->rdhash; | |
27102 | + break; | |
dece6358 AM |
27103 | + case Opt_rdhash_def: |
27104 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
27105 | + break; | |
27106 | + | |
27107 | + case Opt_shwh: | |
27108 | + au_opt_set(sbinfo->si_mntflags, SHWH); | |
27109 | + break; | |
27110 | + case Opt_noshwh: | |
27111 | + au_opt_clr(sbinfo->si_mntflags, SHWH); | |
27112 | + break; | |
1facf9fc | 27113 | + |
076b876e AM |
27114 | + case Opt_dirperm1: |
27115 | + au_opt_set(sbinfo->si_mntflags, DIRPERM1); | |
27116 | + break; | |
27117 | + case Opt_nodirperm1: | |
27118 | + au_opt_clr(sbinfo->si_mntflags, DIRPERM1); | |
27119 | + break; | |
27120 | + | |
1facf9fc | 27121 | + case Opt_trunc_xino: |
27122 | + au_opt_set(sbinfo->si_mntflags, TRUNC_XINO); | |
27123 | + break; | |
27124 | + case Opt_notrunc_xino: | |
27125 | + au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO); | |
27126 | + break; | |
27127 | + | |
27128 | + case Opt_trunc_xino_path: | |
27129 | + case Opt_itrunc_xino: | |
acd2b654 AM |
27130 | + err = au_xino_trunc(sb, opt->xino_itrunc.bindex, |
27131 | + /*idx_begin*/0); | |
1facf9fc | 27132 | + if (!err) |
27133 | + err = 1; | |
27134 | + break; | |
27135 | + | |
27136 | + case Opt_trunc_xib: | |
27137 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
27138 | + break; | |
27139 | + case Opt_notrunc_xib: | |
27140 | + au_fclr_opts(opts->flags, TRUNC_XIB); | |
27141 | + break; | |
27142 | + | |
8b6a4947 AM |
27143 | + case Opt_dirren: |
27144 | + err = 1; | |
27145 | + if (!au_opt_test(sbinfo->si_mntflags, DIRREN)) { | |
27146 | + err = au_dr_opt_set(sb); | |
27147 | + if (!err) | |
27148 | + err = 1; | |
27149 | + } | |
27150 | + if (err == 1) | |
27151 | + au_opt_set(sbinfo->si_mntflags, DIRREN); | |
27152 | + break; | |
27153 | + case Opt_nodirren: | |
27154 | + err = 1; | |
27155 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) { | |
27156 | + err = au_dr_opt_clr(sb, au_ftest_opts(opts->flags, | |
27157 | + DR_FLUSHED)); | |
27158 | + if (!err) | |
27159 | + err = 1; | |
27160 | + } | |
27161 | + if (err == 1) | |
27162 | + au_opt_clr(sbinfo->si_mntflags, DIRREN); | |
27163 | + break; | |
27164 | + | |
c1595e42 | 27165 | + case Opt_acl: |
2121bcd9 | 27166 | + sb->s_flags |= SB_POSIXACL; |
c1595e42 JR |
27167 | + break; |
27168 | + case Opt_noacl: | |
2121bcd9 | 27169 | + sb->s_flags &= ~SB_POSIXACL; |
c1595e42 JR |
27170 | + break; |
27171 | + | |
1facf9fc | 27172 | + default: |
27173 | + err = 0; | |
27174 | + break; | |
27175 | + } | |
27176 | + | |
27177 | + return err; | |
27178 | +} | |
27179 | + | |
27180 | +/* | |
27181 | + * returns tri-state. | |
27182 | + * plus: processed without an error | |
27183 | + * zero: unprocessed | |
27184 | + * minus: error | |
27185 | + */ | |
27186 | +static int au_opt_br(struct super_block *sb, struct au_opt *opt, | |
27187 | + struct au_opts *opts) | |
27188 | +{ | |
27189 | + int err, do_refresh; | |
27190 | + | |
27191 | + err = 0; | |
27192 | + switch (opt->type) { | |
27193 | + case Opt_append: | |
5afbbe0d | 27194 | + opt->add.bindex = au_sbbot(sb) + 1; |
1facf9fc | 27195 | + if (opt->add.bindex < 0) |
27196 | + opt->add.bindex = 0; | |
27197 | + goto add; | |
eca34b5c | 27198 | + /* Always goto add, not fallthrough */ |
1facf9fc | 27199 | + case Opt_prepend: |
27200 | + opt->add.bindex = 0; | |
eca34b5c | 27201 | + /* fallthrough */ |
f6b6e03d | 27202 | + add: /* indented label */ |
1facf9fc | 27203 | + case Opt_add: |
27204 | + err = au_br_add(sb, &opt->add, | |
27205 | + au_ftest_opts(opts->flags, REMOUNT)); | |
27206 | + if (!err) { | |
27207 | + err = 1; | |
027c5e7a | 27208 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 27209 | + } |
27210 | + break; | |
27211 | + | |
27212 | + case Opt_del: | |
27213 | + case Opt_idel: | |
27214 | + err = au_br_del(sb, &opt->del, | |
27215 | + au_ftest_opts(opts->flags, REMOUNT)); | |
27216 | + if (!err) { | |
27217 | + err = 1; | |
27218 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
027c5e7a | 27219 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 27220 | + } |
27221 | + break; | |
27222 | + | |
27223 | + case Opt_mod: | |
27224 | + case Opt_imod: | |
27225 | + err = au_br_mod(sb, &opt->mod, | |
27226 | + au_ftest_opts(opts->flags, REMOUNT), | |
27227 | + &do_refresh); | |
27228 | + if (!err) { | |
27229 | + err = 1; | |
027c5e7a AM |
27230 | + if (do_refresh) |
27231 | + au_fset_opts(opts->flags, REFRESH); | |
1facf9fc | 27232 | + } |
27233 | + break; | |
27234 | + } | |
1facf9fc | 27235 | + return err; |
27236 | +} | |
27237 | + | |
27238 | +static int au_opt_xino(struct super_block *sb, struct au_opt *opt, | |
27239 | + struct au_opt_xino **opt_xino, | |
27240 | + struct au_opts *opts) | |
27241 | +{ | |
27242 | + int err; | |
1facf9fc | 27243 | + |
27244 | + err = 0; | |
27245 | + switch (opt->type) { | |
27246 | + case Opt_xino: | |
062440b3 AM |
27247 | + err = au_xino_set(sb, &opt->xino, |
27248 | + !!au_ftest_opts(opts->flags, REMOUNT)); | |
27249 | + if (unlikely(err)) | |
27250 | + break; | |
27251 | + | |
27252 | + *opt_xino = &opt->xino; | |
1facf9fc | 27253 | + break; |
27254 | + | |
27255 | + case Opt_noxino: | |
27256 | + au_xino_clr(sb); | |
1facf9fc | 27257 | + *opt_xino = (void *)-1; |
27258 | + break; | |
27259 | + } | |
27260 | + | |
27261 | + return err; | |
27262 | +} | |
27263 | + | |
27264 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
27265 | + unsigned int pending) | |
27266 | +{ | |
076b876e | 27267 | + int err, fhsm; |
5afbbe0d | 27268 | + aufs_bindex_t bindex, bbot; |
79b8bda9 | 27269 | + unsigned char do_plink, skip, do_free, can_no_dreval; |
1facf9fc | 27270 | + struct au_branch *br; |
27271 | + struct au_wbr *wbr; | |
79b8bda9 | 27272 | + struct dentry *root, *dentry; |
1facf9fc | 27273 | + struct inode *dir, *h_dir; |
27274 | + struct au_sbinfo *sbinfo; | |
27275 | + struct au_hinode *hdir; | |
27276 | + | |
dece6358 AM |
27277 | + SiMustAnyLock(sb); |
27278 | + | |
1facf9fc | 27279 | + sbinfo = au_sbi(sb); |
27280 | + AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA)); | |
27281 | + | |
2121bcd9 | 27282 | + if (!(sb_flags & SB_RDONLY)) { |
dece6358 | 27283 | + if (unlikely(!au_br_writable(au_sbr_perm(sb, 0)))) |
0c3ec466 | 27284 | + pr_warn("first branch should be rw\n"); |
dece6358 | 27285 | + if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH))) |
febd17d6 | 27286 | + pr_warn_once("shwh should be used with ro\n"); |
dece6358 | 27287 | + } |
1facf9fc | 27288 | + |
4a4d8108 | 27289 | + if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY) |
1facf9fc | 27290 | + && !au_opt_test(sbinfo->si_mntflags, XINO)) |
febd17d6 | 27291 | + pr_warn_once("udba=*notify requires xino\n"); |
1facf9fc | 27292 | + |
076b876e | 27293 | + if (au_opt_test(sbinfo->si_mntflags, DIRPERM1)) |
febd17d6 JR |
27294 | + pr_warn_once("dirperm1 breaks the protection" |
27295 | + " by the permission bits on the lower branch\n"); | |
076b876e | 27296 | + |
1facf9fc | 27297 | + err = 0; |
076b876e | 27298 | + fhsm = 0; |
1facf9fc | 27299 | + root = sb->s_root; |
5527c038 | 27300 | + dir = d_inode(root); |
1facf9fc | 27301 | + do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK); |
79b8bda9 AM |
27302 | + can_no_dreval = !!au_opt_test((sbinfo->si_mntflags | pending), |
27303 | + UDBA_NONE); | |
5afbbe0d AM |
27304 | + bbot = au_sbbot(sb); |
27305 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
1facf9fc | 27306 | + skip = 0; |
27307 | + h_dir = au_h_iptr(dir, bindex); | |
27308 | + br = au_sbr(sb, bindex); | |
1facf9fc | 27309 | + |
c1595e42 JR |
27310 | + if ((br->br_perm & AuBrAttr_ICEX) |
27311 | + && !h_dir->i_op->listxattr) | |
27312 | + br->br_perm &= ~AuBrAttr_ICEX; | |
43982f53 | 27313 | +#if 0 /* untested */ |
c1595e42 | 27314 | + if ((br->br_perm & AuBrAttr_ICEX_SEC) |
2121bcd9 | 27315 | + && (au_br_sb(br)->s_flags & SB_NOSEC)) |
c1595e42 JR |
27316 | + br->br_perm &= ~AuBrAttr_ICEX_SEC; |
27317 | +#endif | |
27318 | + | |
27319 | + do_free = 0; | |
1facf9fc | 27320 | + wbr = br->br_wbr; |
27321 | + if (wbr) | |
27322 | + wbr_wh_read_lock(wbr); | |
27323 | + | |
1e00d052 | 27324 | + if (!au_br_writable(br->br_perm)) { |
1facf9fc | 27325 | + do_free = !!wbr; |
27326 | + skip = (!wbr | |
27327 | + || (!wbr->wbr_whbase | |
27328 | + && !wbr->wbr_plink | |
27329 | + && !wbr->wbr_orph)); | |
1e00d052 | 27330 | + } else if (!au_br_wh_linkable(br->br_perm)) { |
1facf9fc | 27331 | + /* skip = (!br->br_whbase && !br->br_orph); */ |
27332 | + skip = (!wbr || !wbr->wbr_whbase); | |
27333 | + if (skip && wbr) { | |
27334 | + if (do_plink) | |
27335 | + skip = !!wbr->wbr_plink; | |
27336 | + else | |
27337 | + skip = !wbr->wbr_plink; | |
27338 | + } | |
1e00d052 | 27339 | + } else { |
1facf9fc | 27340 | + /* skip = (br->br_whbase && br->br_ohph); */ |
27341 | + skip = (wbr && wbr->wbr_whbase); | |
27342 | + if (skip) { | |
27343 | + if (do_plink) | |
27344 | + skip = !!wbr->wbr_plink; | |
27345 | + else | |
27346 | + skip = !wbr->wbr_plink; | |
27347 | + } | |
1facf9fc | 27348 | + } |
27349 | + if (wbr) | |
27350 | + wbr_wh_read_unlock(wbr); | |
27351 | + | |
79b8bda9 AM |
27352 | + if (can_no_dreval) { |
27353 | + dentry = br->br_path.dentry; | |
27354 | + spin_lock(&dentry->d_lock); | |
27355 | + if (dentry->d_flags & | |
27356 | + (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE)) | |
27357 | + can_no_dreval = 0; | |
27358 | + spin_unlock(&dentry->d_lock); | |
27359 | + } | |
27360 | + | |
076b876e AM |
27361 | + if (au_br_fhsm(br->br_perm)) { |
27362 | + fhsm++; | |
27363 | + AuDebugOn(!br->br_fhsm); | |
27364 | + } | |
27365 | + | |
1facf9fc | 27366 | + if (skip) |
27367 | + continue; | |
27368 | + | |
27369 | + hdir = au_hi(dir, bindex); | |
5afbbe0d | 27370 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 27371 | + if (wbr) |
27372 | + wbr_wh_write_lock(wbr); | |
86dc4139 | 27373 | + err = au_wh_init(br, sb); |
1facf9fc | 27374 | + if (wbr) |
27375 | + wbr_wh_write_unlock(wbr); | |
5afbbe0d | 27376 | + au_hn_inode_unlock(hdir); |
1facf9fc | 27377 | + |
27378 | + if (!err && do_free) { | |
9f237c51 | 27379 | + au_kfree_rcu(wbr); |
1facf9fc | 27380 | + br->br_wbr = NULL; |
27381 | + } | |
27382 | + } | |
27383 | + | |
79b8bda9 AM |
27384 | + if (can_no_dreval) |
27385 | + au_fset_si(sbinfo, NO_DREVAL); | |
27386 | + else | |
27387 | + au_fclr_si(sbinfo, NO_DREVAL); | |
27388 | + | |
c1595e42 | 27389 | + if (fhsm >= 2) { |
076b876e | 27390 | + au_fset_si(sbinfo, FHSM); |
5afbbe0d | 27391 | + for (bindex = bbot; bindex >= 0; bindex--) { |
c1595e42 JR |
27392 | + br = au_sbr(sb, bindex); |
27393 | + if (au_br_fhsm(br->br_perm)) { | |
27394 | + au_fhsm_set_bottom(sb, bindex); | |
27395 | + break; | |
27396 | + } | |
27397 | + } | |
27398 | + } else { | |
076b876e | 27399 | + au_fclr_si(sbinfo, FHSM); |
c1595e42 JR |
27400 | + au_fhsm_set_bottom(sb, -1); |
27401 | + } | |
076b876e | 27402 | + |
1facf9fc | 27403 | + return err; |
27404 | +} | |
27405 | + | |
27406 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts) | |
27407 | +{ | |
27408 | + int err; | |
27409 | + unsigned int tmp; | |
5afbbe0d | 27410 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 27411 | + struct au_opt *opt; |
27412 | + struct au_opt_xino *opt_xino, xino; | |
27413 | + struct au_sbinfo *sbinfo; | |
027c5e7a | 27414 | + struct au_branch *br; |
076b876e | 27415 | + struct inode *dir; |
1facf9fc | 27416 | + |
dece6358 AM |
27417 | + SiMustWriteLock(sb); |
27418 | + | |
1facf9fc | 27419 | + err = 0; |
27420 | + opt_xino = NULL; | |
27421 | + opt = opts->opt; | |
27422 | + while (err >= 0 && opt->type != Opt_tail) | |
27423 | + err = au_opt_simple(sb, opt++, opts); | |
27424 | + if (err > 0) | |
27425 | + err = 0; | |
27426 | + else if (unlikely(err < 0)) | |
27427 | + goto out; | |
27428 | + | |
27429 | + /* disable xino and udba temporary */ | |
27430 | + sbinfo = au_sbi(sb); | |
27431 | + tmp = sbinfo->si_mntflags; | |
27432 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
27433 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL); | |
27434 | + | |
27435 | + opt = opts->opt; | |
27436 | + while (err >= 0 && opt->type != Opt_tail) | |
27437 | + err = au_opt_br(sb, opt++, opts); | |
27438 | + if (err > 0) | |
27439 | + err = 0; | |
27440 | + else if (unlikely(err < 0)) | |
27441 | + goto out; | |
27442 | + | |
5afbbe0d AM |
27443 | + bbot = au_sbbot(sb); |
27444 | + if (unlikely(bbot < 0)) { | |
1facf9fc | 27445 | + err = -EINVAL; |
4a4d8108 | 27446 | + pr_err("no branches\n"); |
1facf9fc | 27447 | + goto out; |
27448 | + } | |
27449 | + | |
27450 | + if (au_opt_test(tmp, XINO)) | |
27451 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
27452 | + opt = opts->opt; | |
27453 | + while (!err && opt->type != Opt_tail) | |
27454 | + err = au_opt_xino(sb, opt++, &opt_xino, opts); | |
27455 | + if (unlikely(err)) | |
27456 | + goto out; | |
27457 | + | |
27458 | + err = au_opts_verify(sb, sb->s_flags, tmp); | |
27459 | + if (unlikely(err)) | |
27460 | + goto out; | |
27461 | + | |
27462 | + /* restore xino */ | |
27463 | + if (au_opt_test(tmp, XINO) && !opt_xino) { | |
27464 | + xino.file = au_xino_def(sb); | |
27465 | + err = PTR_ERR(xino.file); | |
27466 | + if (IS_ERR(xino.file)) | |
27467 | + goto out; | |
27468 | + | |
27469 | + err = au_xino_set(sb, &xino, /*remount*/0); | |
27470 | + fput(xino.file); | |
27471 | + if (unlikely(err)) | |
27472 | + goto out; | |
27473 | + } | |
27474 | + | |
27475 | + /* restore udba */ | |
027c5e7a | 27476 | + tmp &= AuOptMask_UDBA; |
1facf9fc | 27477 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; |
027c5e7a | 27478 | + sbinfo->si_mntflags |= tmp; |
5afbbe0d AM |
27479 | + bbot = au_sbbot(sb); |
27480 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
027c5e7a AM |
27481 | + br = au_sbr(sb, bindex); |
27482 | + err = au_hnotify_reset_br(tmp, br, br->br_perm); | |
27483 | + if (unlikely(err)) | |
27484 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", | |
27485 | + bindex, err); | |
27486 | + /* go on even if err */ | |
27487 | + } | |
4a4d8108 | 27488 | + if (au_opt_test(tmp, UDBA_HNOTIFY)) { |
5527c038 | 27489 | + dir = d_inode(sb->s_root); |
4a4d8108 | 27490 | + au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO); |
1facf9fc | 27491 | + } |
27492 | + | |
4f0767ce | 27493 | +out: |
1facf9fc | 27494 | + return err; |
27495 | +} | |
27496 | + | |
27497 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts) | |
27498 | +{ | |
27499 | + int err, rerr; | |
79b8bda9 | 27500 | + unsigned char no_dreval; |
1facf9fc | 27501 | + struct inode *dir; |
27502 | + struct au_opt_xino *opt_xino; | |
27503 | + struct au_opt *opt; | |
27504 | + struct au_sbinfo *sbinfo; | |
27505 | + | |
dece6358 AM |
27506 | + SiMustWriteLock(sb); |
27507 | + | |
8b6a4947 AM |
27508 | + err = au_dr_opt_flush(sb); |
27509 | + if (unlikely(err)) | |
27510 | + goto out; | |
27511 | + au_fset_opts(opts->flags, DR_FLUSHED); | |
27512 | + | |
5527c038 | 27513 | + dir = d_inode(sb->s_root); |
1facf9fc | 27514 | + sbinfo = au_sbi(sb); |
1facf9fc | 27515 | + opt_xino = NULL; |
27516 | + opt = opts->opt; | |
27517 | + while (err >= 0 && opt->type != Opt_tail) { | |
27518 | + err = au_opt_simple(sb, opt, opts); | |
27519 | + if (!err) | |
27520 | + err = au_opt_br(sb, opt, opts); | |
27521 | + if (!err) | |
27522 | + err = au_opt_xino(sb, opt, &opt_xino, opts); | |
27523 | + opt++; | |
27524 | + } | |
27525 | + if (err > 0) | |
27526 | + err = 0; | |
27527 | + AuTraceErr(err); | |
27528 | + /* go on even err */ | |
27529 | + | |
79b8bda9 | 27530 | + no_dreval = !!au_ftest_si(sbinfo, NO_DREVAL); |
1facf9fc | 27531 | + rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0); |
27532 | + if (unlikely(rerr && !err)) | |
27533 | + err = rerr; | |
27534 | + | |
79b8bda9 | 27535 | + if (no_dreval != !!au_ftest_si(sbinfo, NO_DREVAL)) |
b95c5147 | 27536 | + au_fset_opts(opts->flags, REFRESH_IDOP); |
79b8bda9 | 27537 | + |
1facf9fc | 27538 | + if (au_ftest_opts(opts->flags, TRUNC_XIB)) { |
27539 | + rerr = au_xib_trunc(sb); | |
27540 | + if (unlikely(rerr && !err)) | |
27541 | + err = rerr; | |
27542 | + } | |
27543 | + | |
27544 | + /* will be handled by the caller */ | |
027c5e7a | 27545 | + if (!au_ftest_opts(opts->flags, REFRESH) |
79b8bda9 AM |
27546 | + && (opts->given_udba |
27547 | + || au_opt_test(sbinfo->si_mntflags, XINO) | |
b95c5147 | 27548 | + || au_ftest_opts(opts->flags, REFRESH_IDOP) |
79b8bda9 | 27549 | + )) |
027c5e7a | 27550 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 27551 | + |
27552 | + AuDbg("status 0x%x\n", opts->flags); | |
8b6a4947 AM |
27553 | + |
27554 | +out: | |
1facf9fc | 27555 | + return err; |
27556 | +} | |
27557 | + | |
27558 | +/* ---------------------------------------------------------------------- */ | |
27559 | + | |
27560 | +unsigned int au_opt_udba(struct super_block *sb) | |
27561 | +{ | |
27562 | + return au_mntflags(sb) & AuOptMask_UDBA; | |
27563 | +} | |
7f207e10 | 27564 | diff -urN /usr/share/empty/fs/aufs/opts.h linux/fs/aufs/opts.h |
eca34b5c | 27565 | --- /usr/share/empty/fs/aufs/opts.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 27566 | +++ linux/fs/aufs/opts.h 2020-01-27 10:57:18.175538316 +0100 |
062440b3 AM |
27567 | @@ -0,0 +1,225 @@ |
27568 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 27569 | +/* |
016522bc | 27570 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 27571 | + * |
27572 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27573 | + * it under the terms of the GNU General Public License as published by | |
27574 | + * the Free Software Foundation; either version 2 of the License, or | |
27575 | + * (at your option) any later version. | |
dece6358 AM |
27576 | + * |
27577 | + * This program is distributed in the hope that it will be useful, | |
27578 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27579 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27580 | + * GNU General Public License for more details. | |
27581 | + * | |
27582 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 27583 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 27584 | + */ |
27585 | + | |
27586 | +/* | |
27587 | + * mount options/flags | |
27588 | + */ | |
27589 | + | |
27590 | +#ifndef __AUFS_OPTS_H__ | |
27591 | +#define __AUFS_OPTS_H__ | |
27592 | + | |
27593 | +#ifdef __KERNEL__ | |
27594 | + | |
dece6358 | 27595 | +#include <linux/path.h> |
1facf9fc | 27596 | + |
dece6358 | 27597 | +struct file; |
dece6358 | 27598 | + |
1facf9fc | 27599 | +/* ---------------------------------------------------------------------- */ |
27600 | + | |
27601 | +/* mount flags */ | |
27602 | +#define AuOpt_XINO 1 /* external inode number bitmap | |
27603 | + and translation table */ | |
27604 | +#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */ | |
27605 | +#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */ | |
27606 | +#define AuOpt_UDBA_REVAL (1 << 3) | |
4a4d8108 | 27607 | +#define AuOpt_UDBA_HNOTIFY (1 << 4) |
dece6358 AM |
27608 | +#define AuOpt_SHWH (1 << 5) /* show whiteout */ |
27609 | +#define AuOpt_PLINK (1 << 6) /* pseudo-link */ | |
076b876e AM |
27610 | +#define AuOpt_DIRPERM1 (1 << 7) /* ignore the lower dir's perm |
27611 | + bits */ | |
dece6358 AM |
27612 | +#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */ |
27613 | +#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */ | |
27614 | +#define AuOpt_SUM_W (1 << 11) /* unimplemented */ | |
27615 | +#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */ | |
eca801bf | 27616 | +#define AuOpt_VERBOSE (1 << 13) /* print the cause of error */ |
4a4d8108 | 27617 | +#define AuOpt_DIO (1 << 14) /* direct io */ |
8b6a4947 | 27618 | +#define AuOpt_DIRREN (1 << 15) /* directory rename */ |
1facf9fc | 27619 | + |
4a4d8108 AM |
27620 | +#ifndef CONFIG_AUFS_HNOTIFY |
27621 | +#undef AuOpt_UDBA_HNOTIFY | |
27622 | +#define AuOpt_UDBA_HNOTIFY 0 | |
1facf9fc | 27623 | +#endif |
8b6a4947 AM |
27624 | +#ifndef CONFIG_AUFS_DIRREN |
27625 | +#undef AuOpt_DIRREN | |
27626 | +#define AuOpt_DIRREN 0 | |
27627 | +#endif | |
dece6358 AM |
27628 | +#ifndef CONFIG_AUFS_SHWH |
27629 | +#undef AuOpt_SHWH | |
27630 | +#define AuOpt_SHWH 0 | |
27631 | +#endif | |
1facf9fc | 27632 | + |
27633 | +#define AuOpt_Def (AuOpt_XINO \ | |
27634 | + | AuOpt_UDBA_REVAL \ | |
27635 | + | AuOpt_PLINK \ | |
27636 | + /* | AuOpt_DIRPERM1 */ \ | |
27637 | + | AuOpt_WARN_PERM) | |
27638 | +#define AuOptMask_UDBA (AuOpt_UDBA_NONE \ | |
27639 | + | AuOpt_UDBA_REVAL \ | |
4a4d8108 | 27640 | + | AuOpt_UDBA_HNOTIFY) |
1facf9fc | 27641 | + |
27642 | +#define au_opt_test(flags, name) (flags & AuOpt_##name) | |
27643 | +#define au_opt_set(flags, name) do { \ | |
27644 | + BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \ | |
27645 | + ((flags) |= AuOpt_##name); \ | |
27646 | +} while (0) | |
27647 | +#define au_opt_set_udba(flags, name) do { \ | |
27648 | + (flags) &= ~AuOptMask_UDBA; \ | |
27649 | + ((flags) |= AuOpt_##name); \ | |
27650 | +} while (0) | |
7f207e10 AM |
27651 | +#define au_opt_clr(flags, name) do { \ |
27652 | + ((flags) &= ~AuOpt_##name); \ | |
27653 | +} while (0) | |
1facf9fc | 27654 | + |
e49829fe JR |
27655 | +static inline unsigned int au_opts_plink(unsigned int mntflags) |
27656 | +{ | |
27657 | +#ifdef CONFIG_PROC_FS | |
27658 | + return mntflags; | |
27659 | +#else | |
27660 | + return mntflags & ~AuOpt_PLINK; | |
27661 | +#endif | |
27662 | +} | |
27663 | + | |
1facf9fc | 27664 | +/* ---------------------------------------------------------------------- */ |
27665 | + | |
27666 | +/* policies to select one among multiple writable branches */ | |
27667 | +enum { | |
27668 | + AuWbrCreate_TDP, /* top down parent */ | |
27669 | + AuWbrCreate_RR, /* round robin */ | |
27670 | + AuWbrCreate_MFS, /* most free space */ | |
27671 | + AuWbrCreate_MFSV, /* mfs with seconds */ | |
27672 | + AuWbrCreate_MFSRR, /* mfs then rr */ | |
27673 | + AuWbrCreate_MFSRRV, /* mfs then rr with seconds */ | |
f2c43d5f AM |
27674 | + AuWbrCreate_TDMFS, /* top down regardless parent and mfs */ |
27675 | + AuWbrCreate_TDMFSV, /* top down regardless parent and mfs */ | |
1facf9fc | 27676 | + AuWbrCreate_PMFS, /* parent and mfs */ |
27677 | + AuWbrCreate_PMFSV, /* parent and mfs with seconds */ | |
392086de AM |
27678 | + AuWbrCreate_PMFSRR, /* parent, mfs and round-robin */ |
27679 | + AuWbrCreate_PMFSRRV, /* plus seconds */ | |
1facf9fc | 27680 | + |
27681 | + AuWbrCreate_Def = AuWbrCreate_TDP | |
27682 | +}; | |
27683 | + | |
27684 | +enum { | |
27685 | + AuWbrCopyup_TDP, /* top down parent */ | |
27686 | + AuWbrCopyup_BUP, /* bottom up parent */ | |
27687 | + AuWbrCopyup_BU, /* bottom up */ | |
27688 | + | |
27689 | + AuWbrCopyup_Def = AuWbrCopyup_TDP | |
27690 | +}; | |
27691 | + | |
27692 | +/* ---------------------------------------------------------------------- */ | |
27693 | + | |
27694 | +struct au_opt_add { | |
27695 | + aufs_bindex_t bindex; | |
27696 | + char *pathname; | |
27697 | + int perm; | |
27698 | + struct path path; | |
27699 | +}; | |
27700 | + | |
27701 | +struct au_opt_del { | |
27702 | + char *pathname; | |
27703 | + struct path h_path; | |
27704 | +}; | |
27705 | + | |
27706 | +struct au_opt_mod { | |
27707 | + char *path; | |
27708 | + int perm; | |
27709 | + struct dentry *h_root; | |
27710 | +}; | |
27711 | + | |
27712 | +struct au_opt_xino { | |
27713 | + char *path; | |
27714 | + struct file *file; | |
27715 | +}; | |
27716 | + | |
27717 | +struct au_opt_xino_itrunc { | |
27718 | + aufs_bindex_t bindex; | |
27719 | +}; | |
27720 | + | |
27721 | +struct au_opt_wbr_create { | |
27722 | + int wbr_create; | |
27723 | + int mfs_second; | |
27724 | + unsigned long long mfsrr_watermark; | |
27725 | +}; | |
27726 | + | |
27727 | +struct au_opt { | |
27728 | + int type; | |
27729 | + union { | |
27730 | + struct au_opt_xino xino; | |
27731 | + struct au_opt_xino_itrunc xino_itrunc; | |
27732 | + struct au_opt_add add; | |
27733 | + struct au_opt_del del; | |
27734 | + struct au_opt_mod mod; | |
27735 | + int dirwh; | |
27736 | + int rdcache; | |
27737 | + unsigned int rdblk; | |
27738 | + unsigned int rdhash; | |
27739 | + int udba; | |
27740 | + struct au_opt_wbr_create wbr_create; | |
27741 | + int wbr_copyup; | |
076b876e | 27742 | + unsigned int fhsm_second; |
1facf9fc | 27743 | + }; |
27744 | +}; | |
27745 | + | |
27746 | +/* opts flags */ | |
27747 | +#define AuOpts_REMOUNT 1 | |
027c5e7a AM |
27748 | +#define AuOpts_REFRESH (1 << 1) |
27749 | +#define AuOpts_TRUNC_XIB (1 << 2) | |
27750 | +#define AuOpts_REFRESH_DYAOP (1 << 3) | |
b95c5147 | 27751 | +#define AuOpts_REFRESH_IDOP (1 << 4) |
8b6a4947 | 27752 | +#define AuOpts_DR_FLUSHED (1 << 5) |
1facf9fc | 27753 | +#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name) |
7f207e10 AM |
27754 | +#define au_fset_opts(flags, name) \ |
27755 | + do { (flags) |= AuOpts_##name; } while (0) | |
27756 | +#define au_fclr_opts(flags, name) \ | |
27757 | + do { (flags) &= ~AuOpts_##name; } while (0) | |
1facf9fc | 27758 | + |
8b6a4947 AM |
27759 | +#ifndef CONFIG_AUFS_DIRREN |
27760 | +#undef AuOpts_DR_FLUSHED | |
27761 | +#define AuOpts_DR_FLUSHED 0 | |
27762 | +#endif | |
27763 | + | |
1facf9fc | 27764 | +struct au_opts { |
27765 | + struct au_opt *opt; | |
27766 | + int max_opt; | |
27767 | + | |
27768 | + unsigned int given_udba; | |
27769 | + unsigned int flags; | |
27770 | + unsigned long sb_flags; | |
27771 | +}; | |
27772 | + | |
27773 | +/* ---------------------------------------------------------------------- */ | |
27774 | + | |
7e9cd9fe | 27775 | +/* opts.c */ |
076b876e | 27776 | +void au_optstr_br_perm(au_br_perm_str_t *str, int perm); |
1facf9fc | 27777 | +const char *au_optstr_udba(int udba); |
27778 | +const char *au_optstr_wbr_copyup(int wbr_copyup); | |
27779 | +const char *au_optstr_wbr_create(int wbr_create); | |
27780 | + | |
27781 | +void au_opts_free(struct au_opts *opts); | |
3c1bdaff | 27782 | +struct super_block; |
1facf9fc | 27783 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts); |
27784 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
27785 | + unsigned int pending); | |
27786 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts); | |
27787 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts); | |
27788 | + | |
27789 | +unsigned int au_opt_udba(struct super_block *sb); | |
27790 | + | |
1facf9fc | 27791 | +#endif /* __KERNEL__ */ |
27792 | +#endif /* __AUFS_OPTS_H__ */ | |
7f207e10 | 27793 | diff -urN /usr/share/empty/fs/aufs/plink.c linux/fs/aufs/plink.c |
eca34b5c | 27794 | --- /usr/share/empty/fs/aufs/plink.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 27795 | +++ linux/fs/aufs/plink.c 2020-01-27 10:57:18.175538316 +0100 |
062440b3 | 27796 | @@ -0,0 +1,516 @@ |
cd7a4cd9 | 27797 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 27798 | +/* |
016522bc | 27799 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 27800 | + * |
27801 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27802 | + * it under the terms of the GNU General Public License as published by | |
27803 | + * the Free Software Foundation; either version 2 of the License, or | |
27804 | + * (at your option) any later version. | |
dece6358 AM |
27805 | + * |
27806 | + * This program is distributed in the hope that it will be useful, | |
27807 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27808 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27809 | + * GNU General Public License for more details. | |
27810 | + * | |
27811 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 27812 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 27813 | + */ |
27814 | + | |
27815 | +/* | |
27816 | + * pseudo-link | |
27817 | + */ | |
27818 | + | |
27819 | +#include "aufs.h" | |
27820 | + | |
27821 | +/* | |
e49829fe | 27822 | + * the pseudo-link maintenance mode. |
1facf9fc | 27823 | + * during a user process maintains the pseudo-links, |
27824 | + * prohibit adding a new plink and branch manipulation. | |
e49829fe JR |
27825 | + * |
27826 | + * Flags | |
27827 | + * NOPLM: | |
27828 | + * For entry functions which will handle plink, and i_mutex is already held | |
27829 | + * in VFS. | |
27830 | + * They cannot wait and should return an error at once. | |
27831 | + * Callers has to check the error. | |
27832 | + * NOPLMW: | |
27833 | + * For entry functions which will handle plink, but i_mutex is not held | |
27834 | + * in VFS. | |
27835 | + * They can wait the plink maintenance mode to finish. | |
27836 | + * | |
27837 | + * They behave like F_SETLK and F_SETLKW. | |
27838 | + * If the caller never handle plink, then both flags are unnecessary. | |
1facf9fc | 27839 | + */ |
e49829fe JR |
27840 | + |
27841 | +int au_plink_maint(struct super_block *sb, int flags) | |
1facf9fc | 27842 | +{ |
e49829fe JR |
27843 | + int err; |
27844 | + pid_t pid, ppid; | |
f0c0a007 | 27845 | + struct task_struct *parent, *prev; |
e49829fe | 27846 | + struct au_sbinfo *sbi; |
dece6358 AM |
27847 | + |
27848 | + SiMustAnyLock(sb); | |
27849 | + | |
e49829fe JR |
27850 | + err = 0; |
27851 | + if (!au_opt_test(au_mntflags(sb), PLINK)) | |
27852 | + goto out; | |
27853 | + | |
27854 | + sbi = au_sbi(sb); | |
27855 | + pid = sbi->si_plink_maint_pid; | |
27856 | + if (!pid || pid == current->pid) | |
27857 | + goto out; | |
27858 | + | |
27859 | + /* todo: it highly depends upon /sbin/mount.aufs */ | |
f0c0a007 AM |
27860 | + prev = NULL; |
27861 | + parent = current; | |
27862 | + ppid = 0; | |
e49829fe | 27863 | + rcu_read_lock(); |
f0c0a007 AM |
27864 | + while (1) { |
27865 | + parent = rcu_dereference(parent->real_parent); | |
27866 | + if (parent == prev) | |
27867 | + break; | |
27868 | + ppid = task_pid_vnr(parent); | |
27869 | + if (pid == ppid) { | |
27870 | + rcu_read_unlock(); | |
27871 | + goto out; | |
27872 | + } | |
27873 | + prev = parent; | |
27874 | + } | |
e49829fe | 27875 | + rcu_read_unlock(); |
e49829fe JR |
27876 | + |
27877 | + if (au_ftest_lock(flags, NOPLMW)) { | |
027c5e7a AM |
27878 | + /* if there is no i_mutex lock in VFS, we don't need to wait */ |
27879 | + /* AuDebugOn(!lockdep_depth(current)); */ | |
e49829fe JR |
27880 | + while (sbi->si_plink_maint_pid) { |
27881 | + si_read_unlock(sb); | |
27882 | + /* gave up wake_up_bit() */ | |
27883 | + wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid); | |
27884 | + | |
27885 | + if (au_ftest_lock(flags, FLUSH)) | |
27886 | + au_nwt_flush(&sbi->si_nowait); | |
27887 | + si_noflush_read_lock(sb); | |
27888 | + } | |
27889 | + } else if (au_ftest_lock(flags, NOPLM)) { | |
27890 | + AuDbg("ppid %d, pid %d\n", ppid, pid); | |
27891 | + err = -EAGAIN; | |
27892 | + } | |
27893 | + | |
27894 | +out: | |
27895 | + return err; | |
4a4d8108 AM |
27896 | +} |
27897 | + | |
e49829fe | 27898 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo) |
4a4d8108 | 27899 | +{ |
4a4d8108 | 27900 | + spin_lock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 27901 | + sbinfo->si_plink_maint_pid = 0; |
4a4d8108 | 27902 | + spin_unlock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 27903 | + wake_up_all(&sbinfo->si_plink_wq); |
4a4d8108 AM |
27904 | +} |
27905 | + | |
e49829fe | 27906 | +int au_plink_maint_enter(struct super_block *sb) |
4a4d8108 AM |
27907 | +{ |
27908 | + int err; | |
4a4d8108 AM |
27909 | + struct au_sbinfo *sbinfo; |
27910 | + | |
27911 | + err = 0; | |
4a4d8108 AM |
27912 | + sbinfo = au_sbi(sb); |
27913 | + /* make sure i am the only one in this fs */ | |
e49829fe JR |
27914 | + si_write_lock(sb, AuLock_FLUSH); |
27915 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
27916 | + spin_lock(&sbinfo->si_plink_maint_lock); | |
27917 | + if (!sbinfo->si_plink_maint_pid) | |
27918 | + sbinfo->si_plink_maint_pid = current->pid; | |
27919 | + else | |
27920 | + err = -EBUSY; | |
27921 | + spin_unlock(&sbinfo->si_plink_maint_lock); | |
27922 | + } | |
4a4d8108 AM |
27923 | + si_write_unlock(sb); |
27924 | + | |
27925 | + return err; | |
1facf9fc | 27926 | +} |
27927 | + | |
27928 | +/* ---------------------------------------------------------------------- */ | |
27929 | + | |
1facf9fc | 27930 | +#ifdef CONFIG_AUFS_DEBUG |
27931 | +void au_plink_list(struct super_block *sb) | |
27932 | +{ | |
86dc4139 | 27933 | + int i; |
1facf9fc | 27934 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
27935 | + struct hlist_bl_head *hbl; |
27936 | + struct hlist_bl_node *pos; | |
5afbbe0d | 27937 | + struct au_icntnr *icntnr; |
1facf9fc | 27938 | + |
dece6358 AM |
27939 | + SiMustAnyLock(sb); |
27940 | + | |
1facf9fc | 27941 | + sbinfo = au_sbi(sb); |
27942 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 27943 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 27944 | + |
86dc4139 | 27945 | + for (i = 0; i < AuPlink_NHASH; i++) { |
8b6a4947 AM |
27946 | + hbl = sbinfo->si_plink + i; |
27947 | + hlist_bl_lock(hbl); | |
27948 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) | |
5afbbe0d | 27949 | + AuDbg("%lu\n", icntnr->vfs_inode.i_ino); |
8b6a4947 | 27950 | + hlist_bl_unlock(hbl); |
86dc4139 | 27951 | + } |
1facf9fc | 27952 | +} |
27953 | +#endif | |
27954 | + | |
27955 | +/* is the inode pseudo-linked? */ | |
27956 | +int au_plink_test(struct inode *inode) | |
27957 | +{ | |
86dc4139 | 27958 | + int found, i; |
1facf9fc | 27959 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
27960 | + struct hlist_bl_head *hbl; |
27961 | + struct hlist_bl_node *pos; | |
5afbbe0d | 27962 | + struct au_icntnr *icntnr; |
1facf9fc | 27963 | + |
27964 | + sbinfo = au_sbi(inode->i_sb); | |
dece6358 | 27965 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
1facf9fc | 27966 | + AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK)); |
e49829fe | 27967 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
1facf9fc | 27968 | + |
27969 | + found = 0; | |
86dc4139 | 27970 | + i = au_plink_hash(inode->i_ino); |
8b6a4947 AM |
27971 | + hbl = sbinfo->si_plink + i; |
27972 | + hlist_bl_lock(hbl); | |
27973 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) | |
5afbbe0d | 27974 | + if (&icntnr->vfs_inode == inode) { |
1facf9fc | 27975 | + found = 1; |
27976 | + break; | |
27977 | + } | |
8b6a4947 | 27978 | + hlist_bl_unlock(hbl); |
1facf9fc | 27979 | + return found; |
27980 | +} | |
27981 | + | |
27982 | +/* ---------------------------------------------------------------------- */ | |
27983 | + | |
27984 | +/* | |
27985 | + * generate a name for plink. | |
27986 | + * the file will be stored under AUFS_WH_PLINKDIR. | |
27987 | + */ | |
27988 | +/* 20 is max digits length of ulong 64 */ | |
27989 | +#define PLINK_NAME_LEN ((20 + 1) * 2) | |
27990 | + | |
27991 | +static int plink_name(char *name, int len, struct inode *inode, | |
27992 | + aufs_bindex_t bindex) | |
27993 | +{ | |
27994 | + int rlen; | |
27995 | + struct inode *h_inode; | |
27996 | + | |
27997 | + h_inode = au_h_iptr(inode, bindex); | |
27998 | + rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino); | |
27999 | + return rlen; | |
28000 | +} | |
28001 | + | |
7f207e10 AM |
28002 | +struct au_do_plink_lkup_args { |
28003 | + struct dentry **errp; | |
28004 | + struct qstr *tgtname; | |
28005 | + struct dentry *h_parent; | |
28006 | + struct au_branch *br; | |
28007 | +}; | |
28008 | + | |
28009 | +static struct dentry *au_do_plink_lkup(struct qstr *tgtname, | |
28010 | + struct dentry *h_parent, | |
28011 | + struct au_branch *br) | |
28012 | +{ | |
28013 | + struct dentry *h_dentry; | |
febd17d6 | 28014 | + struct inode *h_inode; |
7f207e10 | 28015 | + |
febd17d6 | 28016 | + h_inode = d_inode(h_parent); |
be118d29 | 28017 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD2); |
b4510431 | 28018 | + h_dentry = vfsub_lkup_one(tgtname, h_parent); |
3c1bdaff | 28019 | + inode_unlock_shared(h_inode); |
7f207e10 AM |
28020 | + return h_dentry; |
28021 | +} | |
28022 | + | |
28023 | +static void au_call_do_plink_lkup(void *args) | |
28024 | +{ | |
28025 | + struct au_do_plink_lkup_args *a = args; | |
28026 | + *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br); | |
28027 | +} | |
28028 | + | |
1facf9fc | 28029 | +/* lookup the plink-ed @inode under the branch at @bindex */ |
28030 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex) | |
28031 | +{ | |
28032 | + struct dentry *h_dentry, *h_parent; | |
28033 | + struct au_branch *br; | |
7f207e10 | 28034 | + int wkq_err; |
1facf9fc | 28035 | + char a[PLINK_NAME_LEN]; |
0c3ec466 | 28036 | + struct qstr tgtname = QSTR_INIT(a, 0); |
1facf9fc | 28037 | + |
e49829fe JR |
28038 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
28039 | + | |
1facf9fc | 28040 | + br = au_sbr(inode->i_sb, bindex); |
28041 | + h_parent = br->br_wbr->wbr_plink; | |
1facf9fc | 28042 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); |
28043 | + | |
2dfbb274 | 28044 | + if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { |
7f207e10 AM |
28045 | + struct au_do_plink_lkup_args args = { |
28046 | + .errp = &h_dentry, | |
28047 | + .tgtname = &tgtname, | |
28048 | + .h_parent = h_parent, | |
28049 | + .br = br | |
28050 | + }; | |
28051 | + | |
28052 | + wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args); | |
28053 | + if (unlikely(wkq_err)) | |
28054 | + h_dentry = ERR_PTR(wkq_err); | |
28055 | + } else | |
28056 | + h_dentry = au_do_plink_lkup(&tgtname, h_parent, br); | |
28057 | + | |
1facf9fc | 28058 | + return h_dentry; |
28059 | +} | |
28060 | + | |
28061 | +/* create a pseudo-link */ | |
28062 | +static int do_whplink(struct qstr *tgt, struct dentry *h_parent, | |
28063 | + struct dentry *h_dentry, struct au_branch *br) | |
28064 | +{ | |
28065 | + int err; | |
28066 | + struct path h_path = { | |
86dc4139 | 28067 | + .mnt = au_br_mnt(br) |
1facf9fc | 28068 | + }; |
523b37e3 | 28069 | + struct inode *h_dir, *delegated; |
1facf9fc | 28070 | + |
5527c038 | 28071 | + h_dir = d_inode(h_parent); |
febd17d6 | 28072 | + inode_lock_nested(h_dir, AuLsc_I_CHILD2); |
4f0767ce | 28073 | +again: |
b4510431 | 28074 | + h_path.dentry = vfsub_lkup_one(tgt, h_parent); |
1facf9fc | 28075 | + err = PTR_ERR(h_path.dentry); |
28076 | + if (IS_ERR(h_path.dentry)) | |
28077 | + goto out; | |
28078 | + | |
28079 | + err = 0; | |
28080 | + /* wh.plink dir is not monitored */ | |
7f207e10 | 28081 | + /* todo: is it really safe? */ |
5527c038 JR |
28082 | + if (d_is_positive(h_path.dentry) |
28083 | + && d_inode(h_path.dentry) != d_inode(h_dentry)) { | |
523b37e3 AM |
28084 | + delegated = NULL; |
28085 | + err = vfsub_unlink(h_dir, &h_path, &delegated, /*force*/0); | |
28086 | + if (unlikely(err == -EWOULDBLOCK)) { | |
28087 | + pr_warn("cannot retry for NFSv4 delegation" | |
28088 | + " for an internal unlink\n"); | |
28089 | + iput(delegated); | |
28090 | + } | |
1facf9fc | 28091 | + dput(h_path.dentry); |
28092 | + h_path.dentry = NULL; | |
28093 | + if (!err) | |
28094 | + goto again; | |
28095 | + } | |
5527c038 | 28096 | + if (!err && d_is_negative(h_path.dentry)) { |
523b37e3 AM |
28097 | + delegated = NULL; |
28098 | + err = vfsub_link(h_dentry, h_dir, &h_path, &delegated); | |
28099 | + if (unlikely(err == -EWOULDBLOCK)) { | |
28100 | + pr_warn("cannot retry for NFSv4 delegation" | |
28101 | + " for an internal link\n"); | |
28102 | + iput(delegated); | |
28103 | + } | |
28104 | + } | |
1facf9fc | 28105 | + dput(h_path.dentry); |
28106 | + | |
4f0767ce | 28107 | +out: |
febd17d6 | 28108 | + inode_unlock(h_dir); |
1facf9fc | 28109 | + return err; |
28110 | +} | |
28111 | + | |
28112 | +struct do_whplink_args { | |
28113 | + int *errp; | |
28114 | + struct qstr *tgt; | |
28115 | + struct dentry *h_parent; | |
28116 | + struct dentry *h_dentry; | |
28117 | + struct au_branch *br; | |
28118 | +}; | |
28119 | + | |
28120 | +static void call_do_whplink(void *args) | |
28121 | +{ | |
28122 | + struct do_whplink_args *a = args; | |
28123 | + *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br); | |
28124 | +} | |
28125 | + | |
28126 | +static int whplink(struct dentry *h_dentry, struct inode *inode, | |
28127 | + aufs_bindex_t bindex, struct au_branch *br) | |
28128 | +{ | |
28129 | + int err, wkq_err; | |
28130 | + struct au_wbr *wbr; | |
28131 | + struct dentry *h_parent; | |
1facf9fc | 28132 | + char a[PLINK_NAME_LEN]; |
0c3ec466 | 28133 | + struct qstr tgtname = QSTR_INIT(a, 0); |
1facf9fc | 28134 | + |
28135 | + wbr = au_sbr(inode->i_sb, bindex)->br_wbr; | |
28136 | + h_parent = wbr->wbr_plink; | |
1facf9fc | 28137 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); |
28138 | + | |
28139 | + /* always superio. */ | |
2dfbb274 | 28140 | + if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { |
1facf9fc | 28141 | + struct do_whplink_args args = { |
28142 | + .errp = &err, | |
28143 | + .tgt = &tgtname, | |
28144 | + .h_parent = h_parent, | |
28145 | + .h_dentry = h_dentry, | |
28146 | + .br = br | |
28147 | + }; | |
28148 | + wkq_err = au_wkq_wait(call_do_whplink, &args); | |
28149 | + if (unlikely(wkq_err)) | |
28150 | + err = wkq_err; | |
28151 | + } else | |
28152 | + err = do_whplink(&tgtname, h_parent, h_dentry, br); | |
1facf9fc | 28153 | + |
28154 | + return err; | |
28155 | +} | |
28156 | + | |
1facf9fc | 28157 | +/* |
28158 | + * create a new pseudo-link for @h_dentry on @bindex. | |
28159 | + * the linked inode is held in aufs @inode. | |
28160 | + */ | |
28161 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
28162 | + struct dentry *h_dentry) | |
28163 | +{ | |
28164 | + struct super_block *sb; | |
28165 | + struct au_sbinfo *sbinfo; | |
8b6a4947 AM |
28166 | + struct hlist_bl_head *hbl; |
28167 | + struct hlist_bl_node *pos; | |
5afbbe0d | 28168 | + struct au_icntnr *icntnr; |
86dc4139 | 28169 | + int found, err, cnt, i; |
1facf9fc | 28170 | + |
28171 | + sb = inode->i_sb; | |
28172 | + sbinfo = au_sbi(sb); | |
28173 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 28174 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 28175 | + |
86dc4139 | 28176 | + found = au_plink_test(inode); |
4a4d8108 | 28177 | + if (found) |
1facf9fc | 28178 | + return; |
4a4d8108 | 28179 | + |
86dc4139 | 28180 | + i = au_plink_hash(inode->i_ino); |
8b6a4947 | 28181 | + hbl = sbinfo->si_plink + i; |
5afbbe0d | 28182 | + au_igrab(inode); |
1facf9fc | 28183 | + |
8b6a4947 AM |
28184 | + hlist_bl_lock(hbl); |
28185 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) { | |
5afbbe0d | 28186 | + if (&icntnr->vfs_inode == inode) { |
4a4d8108 AM |
28187 | + found = 1; |
28188 | + break; | |
28189 | + } | |
1facf9fc | 28190 | + } |
5afbbe0d AM |
28191 | + if (!found) { |
28192 | + icntnr = container_of(inode, struct au_icntnr, vfs_inode); | |
8b6a4947 | 28193 | + hlist_bl_add_head(&icntnr->plink, hbl); |
5afbbe0d | 28194 | + } |
8b6a4947 | 28195 | + hlist_bl_unlock(hbl); |
4a4d8108 | 28196 | + if (!found) { |
8b6a4947 | 28197 | + cnt = au_hbl_count(hbl); |
acd2b654 | 28198 | +#define msg "unexpectedly unbalanced or too many pseudo-links" |
86dc4139 AM |
28199 | + if (cnt > AUFS_PLINK_WARN) |
28200 | + AuWarn1(msg ", %d\n", cnt); | |
28201 | +#undef msg | |
1facf9fc | 28202 | + err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex)); |
5afbbe0d AM |
28203 | + if (unlikely(err)) { |
28204 | + pr_warn("err %d, damaged pseudo link.\n", err); | |
8b6a4947 | 28205 | + au_hbl_del(&icntnr->plink, hbl); |
5afbbe0d | 28206 | + iput(&icntnr->vfs_inode); |
4a4d8108 | 28207 | + } |
5afbbe0d AM |
28208 | + } else |
28209 | + iput(&icntnr->vfs_inode); | |
1facf9fc | 28210 | +} |
28211 | + | |
28212 | +/* free all plinks */ | |
e49829fe | 28213 | +void au_plink_put(struct super_block *sb, int verbose) |
1facf9fc | 28214 | +{ |
86dc4139 | 28215 | + int i, warned; |
1facf9fc | 28216 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
28217 | + struct hlist_bl_head *hbl; |
28218 | + struct hlist_bl_node *pos, *tmp; | |
5afbbe0d | 28219 | + struct au_icntnr *icntnr; |
1facf9fc | 28220 | + |
dece6358 AM |
28221 | + SiMustWriteLock(sb); |
28222 | + | |
1facf9fc | 28223 | + sbinfo = au_sbi(sb); |
28224 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 28225 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 28226 | + |
1facf9fc | 28227 | + /* no spin_lock since sbinfo is write-locked */ |
86dc4139 AM |
28228 | + warned = 0; |
28229 | + for (i = 0; i < AuPlink_NHASH; i++) { | |
8b6a4947 AM |
28230 | + hbl = sbinfo->si_plink + i; |
28231 | + if (!warned && verbose && !hlist_bl_empty(hbl)) { | |
86dc4139 AM |
28232 | + pr_warn("pseudo-link is not flushed"); |
28233 | + warned = 1; | |
28234 | + } | |
8b6a4947 | 28235 | + hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) |
5afbbe0d | 28236 | + iput(&icntnr->vfs_inode); |
8b6a4947 | 28237 | + INIT_HLIST_BL_HEAD(hbl); |
86dc4139 | 28238 | + } |
1facf9fc | 28239 | +} |
28240 | + | |
e49829fe JR |
28241 | +void au_plink_clean(struct super_block *sb, int verbose) |
28242 | +{ | |
28243 | + struct dentry *root; | |
28244 | + | |
28245 | + root = sb->s_root; | |
28246 | + aufs_write_lock(root); | |
28247 | + if (au_opt_test(au_mntflags(sb), PLINK)) | |
28248 | + au_plink_put(sb, verbose); | |
28249 | + aufs_write_unlock(root); | |
28250 | +} | |
28251 | + | |
86dc4139 AM |
28252 | +static int au_plink_do_half_refresh(struct inode *inode, aufs_bindex_t br_id) |
28253 | +{ | |
28254 | + int do_put; | |
5afbbe0d | 28255 | + aufs_bindex_t btop, bbot, bindex; |
86dc4139 AM |
28256 | + |
28257 | + do_put = 0; | |
5afbbe0d AM |
28258 | + btop = au_ibtop(inode); |
28259 | + bbot = au_ibbot(inode); | |
28260 | + if (btop >= 0) { | |
28261 | + for (bindex = btop; bindex <= bbot; bindex++) { | |
86dc4139 AM |
28262 | + if (!au_h_iptr(inode, bindex) |
28263 | + || au_ii_br_id(inode, bindex) != br_id) | |
28264 | + continue; | |
28265 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
28266 | + do_put = 1; | |
28267 | + break; | |
28268 | + } | |
28269 | + if (do_put) | |
5afbbe0d | 28270 | + for (bindex = btop; bindex <= bbot; bindex++) |
86dc4139 AM |
28271 | + if (au_h_iptr(inode, bindex)) { |
28272 | + do_put = 0; | |
28273 | + break; | |
28274 | + } | |
28275 | + } else | |
28276 | + do_put = 1; | |
28277 | + | |
28278 | + return do_put; | |
28279 | +} | |
28280 | + | |
1facf9fc | 28281 | +/* free the plinks on a branch specified by @br_id */ |
28282 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id) | |
28283 | +{ | |
28284 | + struct au_sbinfo *sbinfo; | |
8b6a4947 AM |
28285 | + struct hlist_bl_head *hbl; |
28286 | + struct hlist_bl_node *pos, *tmp; | |
5afbbe0d | 28287 | + struct au_icntnr *icntnr; |
1facf9fc | 28288 | + struct inode *inode; |
86dc4139 | 28289 | + int i, do_put; |
1facf9fc | 28290 | + |
dece6358 AM |
28291 | + SiMustWriteLock(sb); |
28292 | + | |
1facf9fc | 28293 | + sbinfo = au_sbi(sb); |
28294 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 28295 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 28296 | + |
8b6a4947 | 28297 | + /* no bit_lock since sbinfo is write-locked */ |
86dc4139 | 28298 | + for (i = 0; i < AuPlink_NHASH; i++) { |
8b6a4947 AM |
28299 | + hbl = sbinfo->si_plink + i; |
28300 | + hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) { | |
5afbbe0d | 28301 | + inode = au_igrab(&icntnr->vfs_inode); |
86dc4139 AM |
28302 | + ii_write_lock_child(inode); |
28303 | + do_put = au_plink_do_half_refresh(inode, br_id); | |
5afbbe0d | 28304 | + if (do_put) { |
8b6a4947 | 28305 | + hlist_bl_del(&icntnr->plink); |
5afbbe0d AM |
28306 | + iput(inode); |
28307 | + } | |
86dc4139 AM |
28308 | + ii_write_unlock(inode); |
28309 | + iput(inode); | |
dece6358 | 28310 | + } |
dece6358 AM |
28311 | + } |
28312 | +} | |
7f207e10 | 28313 | diff -urN /usr/share/empty/fs/aufs/poll.c linux/fs/aufs/poll.c |
eca34b5c | 28314 | --- /usr/share/empty/fs/aufs/poll.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 28315 | +++ linux/fs/aufs/poll.c 2020-01-27 10:57:18.175538316 +0100 |
cd7a4cd9 AM |
28316 | @@ -0,0 +1,51 @@ |
28317 | +// SPDX-License-Identifier: GPL-2.0 | |
dece6358 | 28318 | +/* |
016522bc | 28319 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
dece6358 AM |
28320 | + * |
28321 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28322 | + * it under the terms of the GNU General Public License as published by | |
28323 | + * the Free Software Foundation; either version 2 of the License, or | |
28324 | + * (at your option) any later version. | |
28325 | + * | |
28326 | + * This program is distributed in the hope that it will be useful, | |
28327 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28328 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28329 | + * GNU General Public License for more details. | |
28330 | + * | |
28331 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28332 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 AM |
28333 | + */ |
28334 | + | |
1308ab2a | 28335 | +/* |
28336 | + * poll operation | |
28337 | + * There is only one filesystem which implements ->poll operation, currently. | |
28338 | + */ | |
28339 | + | |
28340 | +#include "aufs.h" | |
28341 | + | |
cd7a4cd9 | 28342 | +__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt) |
1308ab2a | 28343 | +{ |
be118d29 | 28344 | + __poll_t mask; |
1308ab2a | 28345 | + struct file *h_file; |
1308ab2a | 28346 | + struct super_block *sb; |
28347 | + | |
28348 | + /* We should pretend an error happened. */ | |
be118d29 | 28349 | + mask = EPOLLERR /* | EPOLLIN | EPOLLOUT */; |
b912730e | 28350 | + sb = file->f_path.dentry->d_sb; |
e49829fe | 28351 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 28352 | + |
521ced18 | 28353 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
062440b3 AM |
28354 | + if (IS_ERR(h_file)) { |
28355 | + AuDbg("h_file %ld\n", PTR_ERR(h_file)); | |
1308ab2a | 28356 | + goto out; |
062440b3 | 28357 | + } |
1308ab2a | 28358 | + |
cd7a4cd9 | 28359 | + mask = vfs_poll(h_file, pt); |
b912730e | 28360 | + fput(h_file); /* instead of au_read_post() */ |
1308ab2a | 28361 | + |
4f0767ce | 28362 | +out: |
1308ab2a | 28363 | + si_read_unlock(sb); |
062440b3 | 28364 | + if (mask & EPOLLERR) |
b00004a5 | 28365 | + AuDbg("mask 0x%x\n", mask); |
1308ab2a | 28366 | + return mask; |
28367 | +} | |
c1595e42 | 28368 | diff -urN /usr/share/empty/fs/aufs/posix_acl.c linux/fs/aufs/posix_acl.c |
eca34b5c | 28369 | --- /usr/share/empty/fs/aufs/posix_acl.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 28370 | +++ linux/fs/aufs/posix_acl.c 2020-01-27 10:57:18.175538316 +0100 |
9f00928d | 28371 | @@ -0,0 +1,105 @@ |
cd7a4cd9 | 28372 | +// SPDX-License-Identifier: GPL-2.0 |
c1595e42 | 28373 | +/* |
016522bc | 28374 | + * Copyright (C) 2014-2020 Junjiro R. Okajima |
c1595e42 JR |
28375 | + * |
28376 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28377 | + * it under the terms of the GNU General Public License as published by | |
28378 | + * the Free Software Foundation; either version 2 of the License, or | |
28379 | + * (at your option) any later version. | |
28380 | + * | |
28381 | + * This program is distributed in the hope that it will be useful, | |
28382 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28383 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28384 | + * GNU General Public License for more details. | |
28385 | + * | |
28386 | + * You should have received a copy of the GNU General Public License | |
28387 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
28388 | + */ | |
28389 | + | |
28390 | +/* | |
28391 | + * posix acl operations | |
28392 | + */ | |
28393 | + | |
28394 | +#include <linux/fs.h> | |
c1595e42 JR |
28395 | +#include "aufs.h" |
28396 | + | |
28397 | +struct posix_acl *aufs_get_acl(struct inode *inode, int type) | |
28398 | +{ | |
28399 | + struct posix_acl *acl; | |
28400 | + int err; | |
28401 | + aufs_bindex_t bindex; | |
28402 | + struct inode *h_inode; | |
28403 | + struct super_block *sb; | |
28404 | + | |
28405 | + acl = NULL; | |
28406 | + sb = inode->i_sb; | |
28407 | + si_read_lock(sb, AuLock_FLUSH); | |
28408 | + ii_read_lock_child(inode); | |
2121bcd9 | 28409 | + if (!(sb->s_flags & SB_POSIXACL)) |
c1595e42 JR |
28410 | + goto out; |
28411 | + | |
5afbbe0d | 28412 | + bindex = au_ibtop(inode); |
c1595e42 JR |
28413 | + h_inode = au_h_iptr(inode, bindex); |
28414 | + if (unlikely(!h_inode | |
28415 | + || ((h_inode->i_mode & S_IFMT) | |
28416 | + != (inode->i_mode & S_IFMT)))) { | |
28417 | + err = au_busy_or_stale(); | |
28418 | + acl = ERR_PTR(err); | |
28419 | + goto out; | |
28420 | + } | |
28421 | + | |
28422 | + /* always topmost only */ | |
28423 | + acl = get_acl(h_inode, type); | |
9f00928d AM |
28424 | + if (IS_ERR(acl)) |
28425 | + forget_cached_acl(inode, type); | |
28426 | + else | |
a2654f78 | 28427 | + set_cached_acl(inode, type, acl); |
c1595e42 JR |
28428 | + |
28429 | +out: | |
28430 | + ii_read_unlock(inode); | |
28431 | + si_read_unlock(sb); | |
28432 | + | |
28433 | + AuTraceErrPtr(acl); | |
28434 | + return acl; | |
28435 | +} | |
28436 | + | |
28437 | +int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
28438 | +{ | |
28439 | + int err; | |
28440 | + ssize_t ssz; | |
28441 | + struct dentry *dentry; | |
f2c43d5f | 28442 | + struct au_sxattr arg = { |
c1595e42 JR |
28443 | + .type = AU_ACL_SET, |
28444 | + .u.acl_set = { | |
28445 | + .acl = acl, | |
28446 | + .type = type | |
28447 | + }, | |
28448 | + }; | |
28449 | + | |
5afbbe0d AM |
28450 | + IMustLock(inode); |
28451 | + | |
c1595e42 JR |
28452 | + if (inode->i_ino == AUFS_ROOT_INO) |
28453 | + dentry = dget(inode->i_sb->s_root); | |
28454 | + else { | |
28455 | + dentry = d_find_alias(inode); | |
28456 | + if (!dentry) | |
28457 | + dentry = d_find_any_alias(inode); | |
28458 | + if (!dentry) { | |
28459 | + pr_warn("cannot handle this inode, " | |
28460 | + "please report to aufs-users ML\n"); | |
28461 | + err = -ENOENT; | |
28462 | + goto out; | |
28463 | + } | |
28464 | + } | |
28465 | + | |
f2c43d5f | 28466 | + ssz = au_sxattr(dentry, inode, &arg); |
9f00928d AM |
28467 | + /* forget even it if succeeds since the branch might set differently */ |
28468 | + forget_cached_acl(inode, type); | |
c1595e42 JR |
28469 | + dput(dentry); |
28470 | + err = ssz; | |
9f00928d | 28471 | + if (ssz >= 0) |
c1595e42 JR |
28472 | + err = 0; |
28473 | + | |
28474 | +out: | |
c1595e42 JR |
28475 | + return err; |
28476 | +} | |
7f207e10 | 28477 | diff -urN /usr/share/empty/fs/aufs/procfs.c linux/fs/aufs/procfs.c |
eca34b5c | 28478 | --- /usr/share/empty/fs/aufs/procfs.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 28479 | +++ linux/fs/aufs/procfs.c 2020-04-03 08:16:47.547461775 +0200 |
062440b3 | 28480 | @@ -0,0 +1,171 @@ |
cd7a4cd9 | 28481 | +// SPDX-License-Identifier: GPL-2.0 |
e49829fe | 28482 | +/* |
016522bc | 28483 | + * Copyright (C) 2010-2020 Junjiro R. Okajima |
e49829fe JR |
28484 | + * |
28485 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28486 | + * it under the terms of the GNU General Public License as published by | |
28487 | + * the Free Software Foundation; either version 2 of the License, or | |
28488 | + * (at your option) any later version. | |
28489 | + * | |
28490 | + * This program is distributed in the hope that it will be useful, | |
28491 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28492 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28493 | + * GNU General Public License for more details. | |
28494 | + * | |
28495 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28496 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
e49829fe JR |
28497 | + */ |
28498 | + | |
28499 | +/* | |
28500 | + * procfs interfaces | |
28501 | + */ | |
28502 | + | |
28503 | +#include <linux/proc_fs.h> | |
28504 | +#include "aufs.h" | |
28505 | + | |
28506 | +static int au_procfs_plm_release(struct inode *inode, struct file *file) | |
28507 | +{ | |
28508 | + struct au_sbinfo *sbinfo; | |
28509 | + | |
28510 | + sbinfo = file->private_data; | |
28511 | + if (sbinfo) { | |
28512 | + au_plink_maint_leave(sbinfo); | |
28513 | + kobject_put(&sbinfo->si_kobj); | |
28514 | + } | |
28515 | + | |
28516 | + return 0; | |
28517 | +} | |
28518 | + | |
28519 | +static void au_procfs_plm_write_clean(struct file *file) | |
28520 | +{ | |
28521 | + struct au_sbinfo *sbinfo; | |
28522 | + | |
28523 | + sbinfo = file->private_data; | |
28524 | + if (sbinfo) | |
28525 | + au_plink_clean(sbinfo->si_sb, /*verbose*/0); | |
28526 | +} | |
28527 | + | |
28528 | +static int au_procfs_plm_write_si(struct file *file, unsigned long id) | |
28529 | +{ | |
28530 | + int err; | |
28531 | + struct super_block *sb; | |
28532 | + struct au_sbinfo *sbinfo; | |
8b6a4947 | 28533 | + struct hlist_bl_node *pos; |
e49829fe JR |
28534 | + |
28535 | + err = -EBUSY; | |
28536 | + if (unlikely(file->private_data)) | |
28537 | + goto out; | |
28538 | + | |
28539 | + sb = NULL; | |
53392da6 | 28540 | + /* don't use au_sbilist_lock() here */ |
8b6a4947 AM |
28541 | + hlist_bl_lock(&au_sbilist); |
28542 | + hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) | |
e49829fe | 28543 | + if (id == sysaufs_si_id(sbinfo)) { |
83b672a5 AM |
28544 | + if (kobject_get_unless_zero(&sbinfo->si_kobj)) |
28545 | + sb = sbinfo->si_sb; | |
e49829fe JR |
28546 | + break; |
28547 | + } | |
8b6a4947 | 28548 | + hlist_bl_unlock(&au_sbilist); |
e49829fe JR |
28549 | + |
28550 | + err = -EINVAL; | |
28551 | + if (unlikely(!sb)) | |
28552 | + goto out; | |
28553 | + | |
28554 | + err = au_plink_maint_enter(sb); | |
28555 | + if (!err) | |
28556 | + /* keep kobject_get() */ | |
28557 | + file->private_data = sbinfo; | |
28558 | + else | |
28559 | + kobject_put(&sbinfo->si_kobj); | |
28560 | +out: | |
28561 | + return err; | |
28562 | +} | |
28563 | + | |
28564 | +/* | |
28565 | + * Accept a valid "si=xxxx" only. | |
28566 | + * Once it is accepted successfully, accept "clean" too. | |
28567 | + */ | |
28568 | +static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf, | |
28569 | + size_t count, loff_t *ppos) | |
28570 | +{ | |
28571 | + ssize_t err; | |
28572 | + unsigned long id; | |
28573 | + /* last newline is allowed */ | |
28574 | + char buf[3 + sizeof(unsigned long) * 2 + 1]; | |
28575 | + | |
28576 | + err = -EACCES; | |
28577 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
28578 | + goto out; | |
28579 | + | |
28580 | + err = -EINVAL; | |
28581 | + if (unlikely(count > sizeof(buf))) | |
28582 | + goto out; | |
28583 | + | |
28584 | + err = copy_from_user(buf, ubuf, count); | |
28585 | + if (unlikely(err)) { | |
28586 | + err = -EFAULT; | |
28587 | + goto out; | |
28588 | + } | |
28589 | + buf[count] = 0; | |
28590 | + | |
28591 | + err = -EINVAL; | |
28592 | + if (!strcmp("clean", buf)) { | |
28593 | + au_procfs_plm_write_clean(file); | |
28594 | + goto out_success; | |
28595 | + } else if (unlikely(strncmp("si=", buf, 3))) | |
28596 | + goto out; | |
28597 | + | |
9dbd164d | 28598 | + err = kstrtoul(buf + 3, 16, &id); |
e49829fe JR |
28599 | + if (unlikely(err)) |
28600 | + goto out; | |
28601 | + | |
28602 | + err = au_procfs_plm_write_si(file, id); | |
28603 | + if (unlikely(err)) | |
28604 | + goto out; | |
28605 | + | |
28606 | +out_success: | |
28607 | + err = count; /* success */ | |
28608 | +out: | |
28609 | + return err; | |
28610 | +} | |
28611 | + | |
28612 | +static const struct file_operations au_procfs_plm_fop = { | |
28613 | + .write = au_procfs_plm_write, | |
28614 | + .release = au_procfs_plm_release, | |
28615 | + .owner = THIS_MODULE | |
28616 | +}; | |
28617 | + | |
28618 | +/* ---------------------------------------------------------------------- */ | |
28619 | + | |
28620 | +static struct proc_dir_entry *au_procfs_dir; | |
28621 | + | |
28622 | +void au_procfs_fin(void) | |
28623 | +{ | |
28624 | + remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir); | |
28625 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
28626 | +} | |
28627 | + | |
28628 | +int __init au_procfs_init(void) | |
28629 | +{ | |
28630 | + int err; | |
28631 | + struct proc_dir_entry *entry; | |
28632 | + | |
28633 | + err = -ENOMEM; | |
28634 | + au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL); | |
28635 | + if (unlikely(!au_procfs_dir)) | |
28636 | + goto out; | |
28637 | + | |
cd7a4cd9 | 28638 | + entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | 0200, |
e49829fe JR |
28639 | + au_procfs_dir, &au_procfs_plm_fop); |
28640 | + if (unlikely(!entry)) | |
28641 | + goto out_dir; | |
28642 | + | |
28643 | + err = 0; | |
28644 | + goto out; /* success */ | |
28645 | + | |
28646 | + | |
28647 | +out_dir: | |
28648 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
28649 | +out: | |
28650 | + return err; | |
28651 | +} | |
7f207e10 | 28652 | diff -urN /usr/share/empty/fs/aufs/rdu.c linux/fs/aufs/rdu.c |
eca34b5c | 28653 | --- /usr/share/empty/fs/aufs/rdu.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 28654 | +++ linux/fs/aufs/rdu.c 2020-01-27 10:57:18.178871751 +0100 |
ba1aed25 | 28655 | @@ -0,0 +1,384 @@ |
cd7a4cd9 | 28656 | +// SPDX-License-Identifier: GPL-2.0 |
1308ab2a | 28657 | +/* |
016522bc | 28658 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1308ab2a | 28659 | + * |
28660 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28661 | + * it under the terms of the GNU General Public License as published by | |
28662 | + * the Free Software Foundation; either version 2 of the License, or | |
28663 | + * (at your option) any later version. | |
28664 | + * | |
28665 | + * This program is distributed in the hope that it will be useful, | |
28666 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28667 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28668 | + * GNU General Public License for more details. | |
28669 | + * | |
28670 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28671 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1308ab2a | 28672 | + */ |
28673 | + | |
28674 | +/* | |
28675 | + * readdir in userspace. | |
28676 | + */ | |
28677 | + | |
b752ccd1 | 28678 | +#include <linux/compat.h> |
4a4d8108 | 28679 | +#include <linux/fs_stack.h> |
1308ab2a | 28680 | +#include <linux/security.h> |
1308ab2a | 28681 | +#include "aufs.h" |
28682 | + | |
28683 | +/* bits for struct aufs_rdu.flags */ | |
28684 | +#define AuRdu_CALLED 1 | |
28685 | +#define AuRdu_CONT (1 << 1) | |
28686 | +#define AuRdu_FULL (1 << 2) | |
28687 | +#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) | |
7f207e10 AM |
28688 | +#define au_fset_rdu(flags, name) \ |
28689 | + do { (flags) |= AuRdu_##name; } while (0) | |
28690 | +#define au_fclr_rdu(flags, name) \ | |
28691 | + do { (flags) &= ~AuRdu_##name; } while (0) | |
1308ab2a | 28692 | + |
28693 | +struct au_rdu_arg { | |
392086de | 28694 | + struct dir_context ctx; |
1308ab2a | 28695 | + struct aufs_rdu *rdu; |
28696 | + union au_rdu_ent_ul ent; | |
28697 | + unsigned long end; | |
28698 | + | |
28699 | + struct super_block *sb; | |
28700 | + int err; | |
28701 | +}; | |
28702 | + | |
392086de | 28703 | +static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen, |
1308ab2a | 28704 | + loff_t offset, u64 h_ino, unsigned int d_type) |
28705 | +{ | |
28706 | + int err, len; | |
392086de | 28707 | + struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx); |
1308ab2a | 28708 | + struct aufs_rdu *rdu = arg->rdu; |
28709 | + struct au_rdu_ent ent; | |
28710 | + | |
28711 | + err = 0; | |
28712 | + arg->err = 0; | |
28713 | + au_fset_rdu(rdu->cookie.flags, CALLED); | |
28714 | + len = au_rdu_len(nlen); | |
28715 | + if (arg->ent.ul + len < arg->end) { | |
28716 | + ent.ino = h_ino; | |
28717 | + ent.bindex = rdu->cookie.bindex; | |
28718 | + ent.type = d_type; | |
28719 | + ent.nlen = nlen; | |
4a4d8108 AM |
28720 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) |
28721 | + ent.type = DT_UNKNOWN; | |
1308ab2a | 28722 | + |
9dbd164d | 28723 | + /* unnecessary to support mmap_sem since this is a dir */ |
1308ab2a | 28724 | + err = -EFAULT; |
28725 | + if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) | |
28726 | + goto out; | |
28727 | + if (copy_to_user(arg->ent.e->name, name, nlen)) | |
28728 | + goto out; | |
28729 | + /* the terminating NULL */ | |
28730 | + if (__put_user(0, arg->ent.e->name + nlen)) | |
28731 | + goto out; | |
28732 | + err = 0; | |
28733 | + /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ | |
28734 | + arg->ent.ul += len; | |
28735 | + rdu->rent++; | |
28736 | + } else { | |
28737 | + err = -EFAULT; | |
28738 | + au_fset_rdu(rdu->cookie.flags, FULL); | |
28739 | + rdu->full = 1; | |
28740 | + rdu->tail = arg->ent; | |
28741 | + } | |
28742 | + | |
4f0767ce | 28743 | +out: |
1308ab2a | 28744 | + /* AuTraceErr(err); */ |
28745 | + return err; | |
28746 | +} | |
28747 | + | |
28748 | +static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) | |
28749 | +{ | |
28750 | + int err; | |
28751 | + loff_t offset; | |
28752 | + struct au_rdu_cookie *cookie = &arg->rdu->cookie; | |
28753 | + | |
92d182d2 | 28754 | + /* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */ |
1308ab2a | 28755 | + offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); |
28756 | + err = offset; | |
28757 | + if (unlikely(offset != cookie->h_pos)) | |
28758 | + goto out; | |
28759 | + | |
28760 | + err = 0; | |
28761 | + do { | |
28762 | + arg->err = 0; | |
28763 | + au_fclr_rdu(cookie->flags, CALLED); | |
28764 | + /* smp_mb(); */ | |
392086de | 28765 | + err = vfsub_iterate_dir(h_file, &arg->ctx); |
1308ab2a | 28766 | + if (err >= 0) |
28767 | + err = arg->err; | |
28768 | + } while (!err | |
28769 | + && au_ftest_rdu(cookie->flags, CALLED) | |
28770 | + && !au_ftest_rdu(cookie->flags, FULL)); | |
28771 | + cookie->h_pos = h_file->f_pos; | |
28772 | + | |
4f0767ce | 28773 | +out: |
1308ab2a | 28774 | + AuTraceErr(err); |
28775 | + return err; | |
28776 | +} | |
28777 | + | |
28778 | +static int au_rdu(struct file *file, struct aufs_rdu *rdu) | |
28779 | +{ | |
28780 | + int err; | |
5afbbe0d | 28781 | + aufs_bindex_t bbot; |
392086de AM |
28782 | + struct au_rdu_arg arg = { |
28783 | + .ctx = { | |
2000de60 | 28784 | + .actor = au_rdu_fill |
392086de AM |
28785 | + } |
28786 | + }; | |
1308ab2a | 28787 | + struct dentry *dentry; |
28788 | + struct inode *inode; | |
28789 | + struct file *h_file; | |
28790 | + struct au_rdu_cookie *cookie = &rdu->cookie; | |
28791 | + | |
ba1aed25 AM |
28792 | + /* VERIFY_WRITE */ |
28793 | + err = !access_ok(rdu->ent.e, rdu->sz); | |
1308ab2a | 28794 | + if (unlikely(err)) { |
28795 | + err = -EFAULT; | |
28796 | + AuTraceErr(err); | |
28797 | + goto out; | |
28798 | + } | |
28799 | + rdu->rent = 0; | |
28800 | + rdu->tail = rdu->ent; | |
28801 | + rdu->full = 0; | |
28802 | + arg.rdu = rdu; | |
28803 | + arg.ent = rdu->ent; | |
28804 | + arg.end = arg.ent.ul; | |
28805 | + arg.end += rdu->sz; | |
28806 | + | |
28807 | + err = -ENOTDIR; | |
5afbbe0d | 28808 | + if (unlikely(!file->f_op->iterate && !file->f_op->iterate_shared)) |
1308ab2a | 28809 | + goto out; |
28810 | + | |
28811 | + err = security_file_permission(file, MAY_READ); | |
28812 | + AuTraceErr(err); | |
28813 | + if (unlikely(err)) | |
28814 | + goto out; | |
28815 | + | |
2000de60 | 28816 | + dentry = file->f_path.dentry; |
5527c038 | 28817 | + inode = d_inode(dentry); |
5afbbe0d | 28818 | + inode_lock_shared(inode); |
1308ab2a | 28819 | + |
28820 | + arg.sb = inode->i_sb; | |
e49829fe JR |
28821 | + err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM); |
28822 | + if (unlikely(err)) | |
28823 | + goto out_mtx; | |
027c5e7a AM |
28824 | + err = au_alive_dir(dentry); |
28825 | + if (unlikely(err)) | |
28826 | + goto out_si; | |
e49829fe | 28827 | + /* todo: reval? */ |
1308ab2a | 28828 | + fi_read_lock(file); |
28829 | + | |
28830 | + err = -EAGAIN; | |
28831 | + if (unlikely(au_ftest_rdu(cookie->flags, CONT) | |
28832 | + && cookie->generation != au_figen(file))) | |
28833 | + goto out_unlock; | |
28834 | + | |
28835 | + err = 0; | |
28836 | + if (!rdu->blk) { | |
28837 | + rdu->blk = au_sbi(arg.sb)->si_rdblk; | |
28838 | + if (!rdu->blk) | |
28839 | + rdu->blk = au_dir_size(file, /*dentry*/NULL); | |
28840 | + } | |
5afbbe0d AM |
28841 | + bbot = au_fbtop(file); |
28842 | + if (cookie->bindex < bbot) | |
28843 | + cookie->bindex = bbot; | |
28844 | + bbot = au_fbbot_dir(file); | |
28845 | + /* AuDbg("b%d, b%d\n", cookie->bindex, bbot); */ | |
28846 | + for (; !err && cookie->bindex <= bbot; | |
1308ab2a | 28847 | + cookie->bindex++, cookie->h_pos = 0) { |
4a4d8108 | 28848 | + h_file = au_hf_dir(file, cookie->bindex); |
1308ab2a | 28849 | + if (!h_file) |
28850 | + continue; | |
28851 | + | |
28852 | + au_fclr_rdu(cookie->flags, FULL); | |
28853 | + err = au_rdu_do(h_file, &arg); | |
28854 | + AuTraceErr(err); | |
28855 | + if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) | |
28856 | + break; | |
28857 | + } | |
28858 | + AuDbg("rent %llu\n", rdu->rent); | |
28859 | + | |
28860 | + if (!err && !au_ftest_rdu(cookie->flags, CONT)) { | |
28861 | + rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); | |
28862 | + au_fset_rdu(cookie->flags, CONT); | |
28863 | + cookie->generation = au_figen(file); | |
28864 | + } | |
28865 | + | |
28866 | + ii_read_lock_child(inode); | |
5afbbe0d | 28867 | + fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibtop(inode))); |
1308ab2a | 28868 | + ii_read_unlock(inode); |
28869 | + | |
4f0767ce | 28870 | +out_unlock: |
1308ab2a | 28871 | + fi_read_unlock(file); |
027c5e7a | 28872 | +out_si: |
1308ab2a | 28873 | + si_read_unlock(arg.sb); |
4f0767ce | 28874 | +out_mtx: |
5afbbe0d | 28875 | + inode_unlock_shared(inode); |
4f0767ce | 28876 | +out: |
1308ab2a | 28877 | + AuTraceErr(err); |
28878 | + return err; | |
28879 | +} | |
28880 | + | |
28881 | +static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) | |
28882 | +{ | |
28883 | + int err; | |
28884 | + ino_t ino; | |
28885 | + unsigned long long nent; | |
28886 | + union au_rdu_ent_ul *u; | |
28887 | + struct au_rdu_ent ent; | |
28888 | + struct super_block *sb; | |
28889 | + | |
28890 | + err = 0; | |
28891 | + nent = rdu->nent; | |
28892 | + u = &rdu->ent; | |
2000de60 | 28893 | + sb = file->f_path.dentry->d_sb; |
1308ab2a | 28894 | + si_read_lock(sb, AuLock_FLUSH); |
28895 | + while (nent-- > 0) { | |
9dbd164d | 28896 | + /* unnecessary to support mmap_sem since this is a dir */ |
1308ab2a | 28897 | + err = copy_from_user(&ent, u->e, sizeof(ent)); |
4a4d8108 | 28898 | + if (!err) |
ba1aed25 AM |
28899 | + /* VERIFY_WRITE */ |
28900 | + err = !access_ok(&u->e->ino, sizeof(ino)); | |
1308ab2a | 28901 | + if (unlikely(err)) { |
28902 | + err = -EFAULT; | |
28903 | + AuTraceErr(err); | |
28904 | + break; | |
28905 | + } | |
28906 | + | |
28907 | + /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ | |
28908 | + if (!ent.wh) | |
28909 | + err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); | |
28910 | + else | |
28911 | + err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, | |
28912 | + &ino); | |
28913 | + if (unlikely(err)) { | |
28914 | + AuTraceErr(err); | |
28915 | + break; | |
28916 | + } | |
28917 | + | |
28918 | + err = __put_user(ino, &u->e->ino); | |
28919 | + if (unlikely(err)) { | |
28920 | + err = -EFAULT; | |
28921 | + AuTraceErr(err); | |
28922 | + break; | |
28923 | + } | |
28924 | + u->ul += au_rdu_len(ent.nlen); | |
28925 | + } | |
28926 | + si_read_unlock(sb); | |
28927 | + | |
28928 | + return err; | |
28929 | +} | |
28930 | + | |
28931 | +/* ---------------------------------------------------------------------- */ | |
28932 | + | |
28933 | +static int au_rdu_verify(struct aufs_rdu *rdu) | |
28934 | +{ | |
b752ccd1 | 28935 | + AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " |
1308ab2a | 28936 | + "%llu, b%d, 0x%x, g%u}\n", |
b752ccd1 | 28937 | + rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], |
1308ab2a | 28938 | + rdu->blk, |
28939 | + rdu->rent, rdu->shwh, rdu->full, | |
28940 | + rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, | |
28941 | + rdu->cookie.generation); | |
dece6358 | 28942 | + |
b752ccd1 | 28943 | + if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) |
1308ab2a | 28944 | + return 0; |
dece6358 | 28945 | + |
b752ccd1 AM |
28946 | + AuDbg("%u:%u\n", |
28947 | + rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); | |
1308ab2a | 28948 | + return -EINVAL; |
28949 | +} | |
28950 | + | |
28951 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
dece6358 | 28952 | +{ |
1308ab2a | 28953 | + long err, e; |
28954 | + struct aufs_rdu rdu; | |
28955 | + void __user *p = (void __user *)arg; | |
dece6358 | 28956 | + |
1308ab2a | 28957 | + err = copy_from_user(&rdu, p, sizeof(rdu)); |
28958 | + if (unlikely(err)) { | |
28959 | + err = -EFAULT; | |
28960 | + AuTraceErr(err); | |
28961 | + goto out; | |
28962 | + } | |
28963 | + err = au_rdu_verify(&rdu); | |
dece6358 AM |
28964 | + if (unlikely(err)) |
28965 | + goto out; | |
28966 | + | |
1308ab2a | 28967 | + switch (cmd) { |
28968 | + case AUFS_CTL_RDU: | |
28969 | + err = au_rdu(file, &rdu); | |
28970 | + if (unlikely(err)) | |
28971 | + break; | |
dece6358 | 28972 | + |
1308ab2a | 28973 | + e = copy_to_user(p, &rdu, sizeof(rdu)); |
28974 | + if (unlikely(e)) { | |
28975 | + err = -EFAULT; | |
28976 | + AuTraceErr(err); | |
28977 | + } | |
28978 | + break; | |
28979 | + case AUFS_CTL_RDU_INO: | |
28980 | + err = au_rdu_ino(file, &rdu); | |
28981 | + break; | |
28982 | + | |
28983 | + default: | |
4a4d8108 | 28984 | + /* err = -ENOTTY; */ |
1308ab2a | 28985 | + err = -EINVAL; |
28986 | + } | |
dece6358 | 28987 | + |
4f0767ce | 28988 | +out: |
1308ab2a | 28989 | + AuTraceErr(err); |
28990 | + return err; | |
1facf9fc | 28991 | +} |
b752ccd1 AM |
28992 | + |
28993 | +#ifdef CONFIG_COMPAT | |
28994 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
28995 | +{ | |
28996 | + long err, e; | |
28997 | + struct aufs_rdu rdu; | |
28998 | + void __user *p = compat_ptr(arg); | |
28999 | + | |
29000 | + /* todo: get_user()? */ | |
29001 | + err = copy_from_user(&rdu, p, sizeof(rdu)); | |
29002 | + if (unlikely(err)) { | |
29003 | + err = -EFAULT; | |
29004 | + AuTraceErr(err); | |
29005 | + goto out; | |
29006 | + } | |
29007 | + rdu.ent.e = compat_ptr(rdu.ent.ul); | |
29008 | + err = au_rdu_verify(&rdu); | |
29009 | + if (unlikely(err)) | |
29010 | + goto out; | |
29011 | + | |
29012 | + switch (cmd) { | |
29013 | + case AUFS_CTL_RDU: | |
29014 | + err = au_rdu(file, &rdu); | |
29015 | + if (unlikely(err)) | |
29016 | + break; | |
29017 | + | |
29018 | + rdu.ent.ul = ptr_to_compat(rdu.ent.e); | |
29019 | + rdu.tail.ul = ptr_to_compat(rdu.tail.e); | |
29020 | + e = copy_to_user(p, &rdu, sizeof(rdu)); | |
29021 | + if (unlikely(e)) { | |
29022 | + err = -EFAULT; | |
29023 | + AuTraceErr(err); | |
29024 | + } | |
29025 | + break; | |
29026 | + case AUFS_CTL_RDU_INO: | |
29027 | + err = au_rdu_ino(file, &rdu); | |
29028 | + break; | |
29029 | + | |
29030 | + default: | |
29031 | + /* err = -ENOTTY; */ | |
29032 | + err = -EINVAL; | |
29033 | + } | |
29034 | + | |
4f0767ce | 29035 | +out: |
b752ccd1 AM |
29036 | + AuTraceErr(err); |
29037 | + return err; | |
29038 | +} | |
29039 | +#endif | |
7f207e10 | 29040 | diff -urN /usr/share/empty/fs/aufs/rwsem.h linux/fs/aufs/rwsem.h |
eca34b5c | 29041 | --- /usr/share/empty/fs/aufs/rwsem.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 29042 | +++ linux/fs/aufs/rwsem.h 2020-01-27 10:57:18.178871751 +0100 |
062440b3 AM |
29043 | @@ -0,0 +1,73 @@ |
29044 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 29045 | +/* |
016522bc | 29046 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 29047 | + * |
29048 | + * This program, aufs is free software; you can redistribute it and/or modify | |
29049 | + * it under the terms of the GNU General Public License as published by | |
29050 | + * the Free Software Foundation; either version 2 of the License, or | |
29051 | + * (at your option) any later version. | |
dece6358 AM |
29052 | + * |
29053 | + * This program is distributed in the hope that it will be useful, | |
29054 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29055 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29056 | + * GNU General Public License for more details. | |
29057 | + * | |
29058 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 29059 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 29060 | + */ |
29061 | + | |
29062 | +/* | |
29063 | + * simple read-write semaphore wrappers | |
29064 | + */ | |
29065 | + | |
29066 | +#ifndef __AUFS_RWSEM_H__ | |
29067 | +#define __AUFS_RWSEM_H__ | |
29068 | + | |
29069 | +#ifdef __KERNEL__ | |
29070 | + | |
4a4d8108 | 29071 | +#include "debug.h" |
dece6358 | 29072 | + |
acd2b654 | 29073 | +/* in the future, the name 'au_rwsem' will be totally gone */ |
8b6a4947 | 29074 | +#define au_rwsem rw_semaphore |
dece6358 AM |
29075 | + |
29076 | +/* to debug easier, do not make them inlined functions */ | |
8b6a4947 | 29077 | +#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(rw)) |
dece6358 | 29078 | +/* rwsem_is_locked() is unusable */ |
8b6a4947 AM |
29079 | +#define AuRwMustReadLock(rw) AuDebugOn(!lockdep_recursing(current) \ |
29080 | + && debug_locks \ | |
29081 | + && !lockdep_is_held_type(rw, 1)) | |
29082 | +#define AuRwMustWriteLock(rw) AuDebugOn(!lockdep_recursing(current) \ | |
29083 | + && debug_locks \ | |
29084 | + && !lockdep_is_held_type(rw, 0)) | |
29085 | +#define AuRwMustAnyLock(rw) AuDebugOn(!lockdep_recursing(current) \ | |
29086 | + && debug_locks \ | |
29087 | + && !lockdep_is_held(rw)) | |
29088 | +#define AuRwDestroy(rw) AuDebugOn(!lockdep_recursing(current) \ | |
29089 | + && debug_locks \ | |
29090 | + && lockdep_is_held(rw)) | |
29091 | + | |
29092 | +#define au_rw_init(rw) init_rwsem(rw) | |
dece6358 | 29093 | + |
5afbbe0d AM |
29094 | +#define au_rw_init_wlock(rw) do { \ |
29095 | + au_rw_init(rw); \ | |
8b6a4947 | 29096 | + down_write(rw); \ |
5afbbe0d | 29097 | + } while (0) |
dece6358 | 29098 | + |
8b6a4947 AM |
29099 | +#define au_rw_init_wlock_nested(rw, lsc) do { \ |
29100 | + au_rw_init(rw); \ | |
29101 | + down_write_nested(rw, lsc); \ | |
5afbbe0d | 29102 | + } while (0) |
dece6358 | 29103 | + |
8b6a4947 AM |
29104 | +#define au_rw_read_lock(rw) down_read(rw) |
29105 | +#define au_rw_read_lock_nested(rw, lsc) down_read_nested(rw, lsc) | |
29106 | +#define au_rw_read_unlock(rw) up_read(rw) | |
29107 | +#define au_rw_dgrade_lock(rw) downgrade_write(rw) | |
29108 | +#define au_rw_write_lock(rw) down_write(rw) | |
29109 | +#define au_rw_write_lock_nested(rw, lsc) down_write_nested(rw, lsc) | |
29110 | +#define au_rw_write_unlock(rw) up_write(rw) | |
29111 | +/* why is not _nested version defined? */ | |
29112 | +#define au_rw_read_trylock(rw) down_read_trylock(rw) | |
29113 | +#define au_rw_write_trylock(rw) down_write_trylock(rw) | |
1facf9fc | 29114 | + |
29115 | +#endif /* __KERNEL__ */ | |
29116 | +#endif /* __AUFS_RWSEM_H__ */ | |
7f207e10 | 29117 | diff -urN /usr/share/empty/fs/aufs/sbinfo.c linux/fs/aufs/sbinfo.c |
eca34b5c | 29118 | --- /usr/share/empty/fs/aufs/sbinfo.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 29119 | +++ linux/fs/aufs/sbinfo.c 2020-01-27 10:57:18.178871751 +0100 |
eca801bf | 29120 | @@ -0,0 +1,314 @@ |
cd7a4cd9 | 29121 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 29122 | +/* |
016522bc | 29123 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 29124 | + * |
29125 | + * This program, aufs is free software; you can redistribute it and/or modify | |
29126 | + * it under the terms of the GNU General Public License as published by | |
29127 | + * the Free Software Foundation; either version 2 of the License, or | |
29128 | + * (at your option) any later version. | |
dece6358 AM |
29129 | + * |
29130 | + * This program is distributed in the hope that it will be useful, | |
29131 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29132 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29133 | + * GNU General Public License for more details. | |
29134 | + * | |
29135 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 29136 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 29137 | + */ |
29138 | + | |
29139 | +/* | |
29140 | + * superblock private data | |
29141 | + */ | |
29142 | + | |
eca801bf | 29143 | +#include <linux/iversion.h> |
1facf9fc | 29144 | +#include "aufs.h" |
29145 | + | |
29146 | +/* | |
29147 | + * they are necessary regardless sysfs is disabled. | |
29148 | + */ | |
29149 | +void au_si_free(struct kobject *kobj) | |
29150 | +{ | |
86dc4139 | 29151 | + int i; |
1facf9fc | 29152 | + struct au_sbinfo *sbinfo; |
b752ccd1 | 29153 | + char *locked __maybe_unused; /* debug only */ |
1facf9fc | 29154 | + |
29155 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
86dc4139 | 29156 | + for (i = 0; i < AuPlink_NHASH; i++) |
8b6a4947 | 29157 | + AuDebugOn(!hlist_bl_empty(sbinfo->si_plink + i)); |
f0c0a007 | 29158 | + AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len)); |
5afbbe0d | 29159 | + |
acd2b654 AM |
29160 | + AuLCntZero(au_lcnt_read(&sbinfo->si_ninodes, /*do_rev*/0)); |
29161 | + au_lcnt_fin(&sbinfo->si_ninodes, /*do_sync*/0); | |
29162 | + AuLCntZero(au_lcnt_read(&sbinfo->si_nfiles, /*do_rev*/0)); | |
29163 | + au_lcnt_fin(&sbinfo->si_nfiles, /*do_sync*/0); | |
1facf9fc | 29164 | + |
062440b3 | 29165 | + dbgaufs_si_fin(sbinfo); |
e49829fe | 29166 | + au_rw_write_lock(&sbinfo->si_rwsem); |
1facf9fc | 29167 | + au_br_free(sbinfo); |
e49829fe | 29168 | + au_rw_write_unlock(&sbinfo->si_rwsem); |
b752ccd1 | 29169 | + |
9f237c51 | 29170 | + au_kfree_try_rcu(sbinfo->si_branch); |
1facf9fc | 29171 | + mutex_destroy(&sbinfo->si_xib_mtx); |
dece6358 | 29172 | + AuRwDestroy(&sbinfo->si_rwsem); |
1facf9fc | 29173 | + |
acd2b654 AM |
29174 | + au_lcnt_wait_for_fin(&sbinfo->si_ninodes); |
29175 | + /* si_nfiles is waited too */ | |
9f237c51 | 29176 | + au_kfree_rcu(sbinfo); |
1facf9fc | 29177 | +} |
29178 | + | |
29179 | +int au_si_alloc(struct super_block *sb) | |
29180 | +{ | |
86dc4139 | 29181 | + int err, i; |
1facf9fc | 29182 | + struct au_sbinfo *sbinfo; |
29183 | + | |
29184 | + err = -ENOMEM; | |
4a4d8108 | 29185 | + sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS); |
1facf9fc | 29186 | + if (unlikely(!sbinfo)) |
29187 | + goto out; | |
29188 | + | |
29189 | + /* will be reallocated separately */ | |
29190 | + sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS); | |
29191 | + if (unlikely(!sbinfo->si_branch)) | |
febd17d6 | 29192 | + goto out_sbinfo; |
1facf9fc | 29193 | + |
1facf9fc | 29194 | + err = sysaufs_si_init(sbinfo); |
062440b3 AM |
29195 | + if (!err) { |
29196 | + dbgaufs_si_null(sbinfo); | |
29197 | + err = dbgaufs_si_init(sbinfo); | |
29198 | + if (unlikely(err)) | |
29199 | + kobject_put(&sbinfo->si_kobj); | |
29200 | + } | |
1facf9fc | 29201 | + if (unlikely(err)) |
29202 | + goto out_br; | |
29203 | + | |
29204 | + au_nwt_init(&sbinfo->si_nowait); | |
dece6358 | 29205 | + au_rw_init_wlock(&sbinfo->si_rwsem); |
b752ccd1 | 29206 | + |
acd2b654 AM |
29207 | + au_lcnt_init(&sbinfo->si_ninodes, /*release*/NULL); |
29208 | + au_lcnt_init(&sbinfo->si_nfiles, /*release*/NULL); | |
7f207e10 | 29209 | + |
5afbbe0d | 29210 | + sbinfo->si_bbot = -1; |
392086de | 29211 | + sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2; |
1facf9fc | 29212 | + |
29213 | + sbinfo->si_wbr_copyup = AuWbrCopyup_Def; | |
29214 | + sbinfo->si_wbr_create = AuWbrCreate_Def; | |
4a4d8108 AM |
29215 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup; |
29216 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create; | |
1facf9fc | 29217 | + |
076b876e AM |
29218 | + au_fhsm_init(sbinfo); |
29219 | + | |
e49829fe | 29220 | + sbinfo->si_mntflags = au_opts_plink(AuOpt_Def); |
1facf9fc | 29221 | + |
392086de AM |
29222 | + sbinfo->si_xino_jiffy = jiffies; |
29223 | + sbinfo->si_xino_expire | |
29224 | + = msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC); | |
1facf9fc | 29225 | + mutex_init(&sbinfo->si_xib_mtx); |
1facf9fc | 29226 | + /* leave si_xib_last_pindex and si_xib_next_bit */ |
29227 | + | |
8b6a4947 | 29228 | + INIT_HLIST_BL_HEAD(&sbinfo->si_aopen); |
b912730e | 29229 | + |
e49829fe | 29230 | + sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC); |
1facf9fc | 29231 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; |
29232 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
29233 | + sbinfo->si_dirwh = AUFS_DIRWH_DEF; | |
29234 | + | |
86dc4139 | 29235 | + for (i = 0; i < AuPlink_NHASH; i++) |
8b6a4947 | 29236 | + INIT_HLIST_BL_HEAD(sbinfo->si_plink + i); |
1facf9fc | 29237 | + init_waitqueue_head(&sbinfo->si_plink_wq); |
4a4d8108 | 29238 | + spin_lock_init(&sbinfo->si_plink_maint_lock); |
1facf9fc | 29239 | + |
8b6a4947 | 29240 | + INIT_HLIST_BL_HEAD(&sbinfo->si_files); |
523b37e3 | 29241 | + |
b95c5147 AM |
29242 | + /* with getattr by default */ |
29243 | + sbinfo->si_iop_array = aufs_iop; | |
29244 | + | |
1facf9fc | 29245 | + /* leave other members for sysaufs and si_mnt. */ |
29246 | + sbinfo->si_sb = sb; | |
29247 | + sb->s_fs_info = sbinfo; | |
b752ccd1 | 29248 | + si_pid_set(sb); |
1facf9fc | 29249 | + return 0; /* success */ |
29250 | + | |
4f0767ce | 29251 | +out_br: |
9f237c51 | 29252 | + au_kfree_try_rcu(sbinfo->si_branch); |
4f0767ce | 29253 | +out_sbinfo: |
9f237c51 | 29254 | + au_kfree_rcu(sbinfo); |
4f0767ce | 29255 | +out: |
1facf9fc | 29256 | + return err; |
29257 | +} | |
29258 | + | |
e2f27e51 | 29259 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink) |
1facf9fc | 29260 | +{ |
29261 | + int err, sz; | |
29262 | + struct au_branch **brp; | |
29263 | + | |
dece6358 AM |
29264 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
29265 | + | |
1facf9fc | 29266 | + err = -ENOMEM; |
5afbbe0d | 29267 | + sz = sizeof(*brp) * (sbinfo->si_bbot + 1); |
1facf9fc | 29268 | + if (unlikely(!sz)) |
29269 | + sz = sizeof(*brp); | |
e2f27e51 AM |
29270 | + brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS, |
29271 | + may_shrink); | |
1facf9fc | 29272 | + if (brp) { |
29273 | + sbinfo->si_branch = brp; | |
29274 | + err = 0; | |
29275 | + } | |
29276 | + | |
29277 | + return err; | |
29278 | +} | |
29279 | + | |
29280 | +/* ---------------------------------------------------------------------- */ | |
29281 | + | |
29282 | +unsigned int au_sigen_inc(struct super_block *sb) | |
29283 | +{ | |
29284 | + unsigned int gen; | |
5527c038 | 29285 | + struct inode *inode; |
1facf9fc | 29286 | + |
dece6358 AM |
29287 | + SiMustWriteLock(sb); |
29288 | + | |
1facf9fc | 29289 | + gen = ++au_sbi(sb)->si_generation; |
29290 | + au_update_digen(sb->s_root); | |
5527c038 JR |
29291 | + inode = d_inode(sb->s_root); |
29292 | + au_update_iigen(inode, /*half*/0); | |
be118d29 | 29293 | + inode_inc_iversion(inode); |
1facf9fc | 29294 | + return gen; |
29295 | +} | |
29296 | + | |
29297 | +aufs_bindex_t au_new_br_id(struct super_block *sb) | |
29298 | +{ | |
29299 | + aufs_bindex_t br_id; | |
29300 | + int i; | |
29301 | + struct au_sbinfo *sbinfo; | |
29302 | + | |
dece6358 AM |
29303 | + SiMustWriteLock(sb); |
29304 | + | |
1facf9fc | 29305 | + sbinfo = au_sbi(sb); |
29306 | + for (i = 0; i <= AUFS_BRANCH_MAX; i++) { | |
29307 | + br_id = ++sbinfo->si_last_br_id; | |
7f207e10 | 29308 | + AuDebugOn(br_id < 0); |
1facf9fc | 29309 | + if (br_id && au_br_index(sb, br_id) < 0) |
29310 | + return br_id; | |
29311 | + } | |
29312 | + | |
29313 | + return -1; | |
29314 | +} | |
29315 | + | |
29316 | +/* ---------------------------------------------------------------------- */ | |
29317 | + | |
e49829fe JR |
29318 | +/* it is ok that new 'nwt' tasks are appended while we are sleeping */ |
29319 | +int si_read_lock(struct super_block *sb, int flags) | |
29320 | +{ | |
29321 | + int err; | |
29322 | + | |
29323 | + err = 0; | |
29324 | + if (au_ftest_lock(flags, FLUSH)) | |
29325 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
29326 | + | |
29327 | + si_noflush_read_lock(sb); | |
29328 | + err = au_plink_maint(sb, flags); | |
29329 | + if (unlikely(err)) | |
29330 | + si_read_unlock(sb); | |
29331 | + | |
29332 | + return err; | |
29333 | +} | |
29334 | + | |
29335 | +int si_write_lock(struct super_block *sb, int flags) | |
29336 | +{ | |
29337 | + int err; | |
29338 | + | |
29339 | + if (au_ftest_lock(flags, FLUSH)) | |
29340 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
29341 | + | |
29342 | + si_noflush_write_lock(sb); | |
29343 | + err = au_plink_maint(sb, flags); | |
29344 | + if (unlikely(err)) | |
29345 | + si_write_unlock(sb); | |
29346 | + | |
29347 | + return err; | |
29348 | +} | |
29349 | + | |
1facf9fc | 29350 | +/* dentry and super_block lock. call at entry point */ |
e49829fe | 29351 | +int aufs_read_lock(struct dentry *dentry, int flags) |
1facf9fc | 29352 | +{ |
e49829fe | 29353 | + int err; |
027c5e7a | 29354 | + struct super_block *sb; |
e49829fe | 29355 | + |
027c5e7a AM |
29356 | + sb = dentry->d_sb; |
29357 | + err = si_read_lock(sb, flags); | |
29358 | + if (unlikely(err)) | |
29359 | + goto out; | |
29360 | + | |
29361 | + if (au_ftest_lock(flags, DW)) | |
29362 | + di_write_lock_child(dentry); | |
29363 | + else | |
29364 | + di_read_lock_child(dentry, flags); | |
29365 | + | |
29366 | + if (au_ftest_lock(flags, GEN)) { | |
29367 | + err = au_digen_test(dentry, au_sigen(sb)); | |
79b8bda9 AM |
29368 | + if (!au_opt_test(au_mntflags(sb), UDBA_NONE)) |
29369 | + AuDebugOn(!err && au_dbrange_test(dentry)); | |
29370 | + else if (!err) | |
29371 | + err = au_dbrange_test(dentry); | |
027c5e7a AM |
29372 | + if (unlikely(err)) |
29373 | + aufs_read_unlock(dentry, flags); | |
e49829fe JR |
29374 | + } |
29375 | + | |
027c5e7a | 29376 | +out: |
e49829fe | 29377 | + return err; |
1facf9fc | 29378 | +} |
29379 | + | |
29380 | +void aufs_read_unlock(struct dentry *dentry, int flags) | |
29381 | +{ | |
29382 | + if (au_ftest_lock(flags, DW)) | |
29383 | + di_write_unlock(dentry); | |
29384 | + else | |
29385 | + di_read_unlock(dentry, flags); | |
29386 | + si_read_unlock(dentry->d_sb); | |
29387 | +} | |
29388 | + | |
29389 | +void aufs_write_lock(struct dentry *dentry) | |
29390 | +{ | |
e49829fe | 29391 | + si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW); |
1facf9fc | 29392 | + di_write_lock_child(dentry); |
29393 | +} | |
29394 | + | |
29395 | +void aufs_write_unlock(struct dentry *dentry) | |
29396 | +{ | |
29397 | + di_write_unlock(dentry); | |
29398 | + si_write_unlock(dentry->d_sb); | |
29399 | +} | |
29400 | + | |
e49829fe | 29401 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags) |
1facf9fc | 29402 | +{ |
e49829fe | 29403 | + int err; |
027c5e7a AM |
29404 | + unsigned int sigen; |
29405 | + struct super_block *sb; | |
e49829fe | 29406 | + |
027c5e7a AM |
29407 | + sb = d1->d_sb; |
29408 | + err = si_read_lock(sb, flags); | |
29409 | + if (unlikely(err)) | |
29410 | + goto out; | |
29411 | + | |
b95c5147 | 29412 | + di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIRS)); |
027c5e7a AM |
29413 | + |
29414 | + if (au_ftest_lock(flags, GEN)) { | |
29415 | + sigen = au_sigen(sb); | |
29416 | + err = au_digen_test(d1, sigen); | |
29417 | + AuDebugOn(!err && au_dbrange_test(d1)); | |
29418 | + if (!err) { | |
29419 | + err = au_digen_test(d2, sigen); | |
29420 | + AuDebugOn(!err && au_dbrange_test(d2)); | |
29421 | + } | |
29422 | + if (unlikely(err)) | |
29423 | + aufs_read_and_write_unlock2(d1, d2); | |
29424 | + } | |
29425 | + | |
29426 | +out: | |
e49829fe | 29427 | + return err; |
1facf9fc | 29428 | +} |
29429 | + | |
29430 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2) | |
29431 | +{ | |
29432 | + di_write_unlock2(d1, d2); | |
29433 | + si_read_unlock(d1->d_sb); | |
29434 | +} | |
7f207e10 | 29435 | diff -urN /usr/share/empty/fs/aufs/super.c linux/fs/aufs/super.c |
eca34b5c | 29436 | --- /usr/share/empty/fs/aufs/super.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 29437 | +++ linux/fs/aufs/super.c 2020-01-27 10:57:18.178871751 +0100 |
fbc438ed | 29438 | @@ -0,0 +1,1047 @@ |
cd7a4cd9 | 29439 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 29440 | +/* |
016522bc | 29441 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 29442 | + * |
29443 | + * This program, aufs is free software; you can redistribute it and/or modify | |
29444 | + * it under the terms of the GNU General Public License as published by | |
29445 | + * the Free Software Foundation; either version 2 of the License, or | |
29446 | + * (at your option) any later version. | |
dece6358 AM |
29447 | + * |
29448 | + * This program is distributed in the hope that it will be useful, | |
29449 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29450 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29451 | + * GNU General Public License for more details. | |
29452 | + * | |
29453 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 29454 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 29455 | + */ |
29456 | + | |
29457 | +/* | |
29458 | + * mount and super_block operations | |
29459 | + */ | |
29460 | + | |
eca801bf | 29461 | +#include <linux/iversion.h> |
f6c5ef8b | 29462 | +#include <linux/mm.h> |
1facf9fc | 29463 | +#include <linux/seq_file.h> |
29464 | +#include <linux/statfs.h> | |
7f207e10 | 29465 | +#include <linux/vmalloc.h> |
1facf9fc | 29466 | +#include "aufs.h" |
29467 | + | |
29468 | +/* | |
29469 | + * super_operations | |
29470 | + */ | |
29471 | +static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused) | |
29472 | +{ | |
29473 | + struct au_icntnr *c; | |
29474 | + | |
29475 | + c = au_cache_alloc_icntnr(); | |
29476 | + if (c) { | |
027c5e7a | 29477 | + au_icntnr_init(c); |
be118d29 | 29478 | + inode_set_iversion(&c->vfs_inode, 1); /* sigen(sb); */ |
1facf9fc | 29479 | + c->iinfo.ii_hinode = NULL; |
29480 | + return &c->vfs_inode; | |
29481 | + } | |
29482 | + return NULL; | |
29483 | +} | |
29484 | + | |
29485 | +static void aufs_destroy_inode(struct inode *inode) | |
29486 | +{ | |
5afbbe0d AM |
29487 | + if (!au_is_bad_inode(inode)) |
29488 | + au_iinfo_fin(inode); | |
fbc438ed JR |
29489 | +} |
29490 | + | |
29491 | +static void aufs_free_inode(struct inode *inode) | |
29492 | +{ | |
29493 | + au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode)); | |
1facf9fc | 29494 | +} |
29495 | + | |
29496 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino) | |
29497 | +{ | |
29498 | + struct inode *inode; | |
29499 | + int err; | |
29500 | + | |
29501 | + inode = iget_locked(sb, ino); | |
29502 | + if (unlikely(!inode)) { | |
29503 | + inode = ERR_PTR(-ENOMEM); | |
29504 | + goto out; | |
29505 | + } | |
29506 | + if (!(inode->i_state & I_NEW)) | |
29507 | + goto out; | |
29508 | + | |
29509 | + err = au_xigen_new(inode); | |
29510 | + if (!err) | |
29511 | + err = au_iinfo_init(inode); | |
29512 | + if (!err) | |
be118d29 | 29513 | + inode_inc_iversion(inode); |
1facf9fc | 29514 | + else { |
29515 | + iget_failed(inode); | |
29516 | + inode = ERR_PTR(err); | |
29517 | + } | |
29518 | + | |
4f0767ce | 29519 | +out: |
1facf9fc | 29520 | + /* never return NULL */ |
29521 | + AuDebugOn(!inode); | |
29522 | + AuTraceErrPtr(inode); | |
29523 | + return inode; | |
29524 | +} | |
29525 | + | |
29526 | +/* lock free root dinfo */ | |
29527 | +static int au_show_brs(struct seq_file *seq, struct super_block *sb) | |
29528 | +{ | |
29529 | + int err; | |
5afbbe0d | 29530 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 29531 | + struct path path; |
4a4d8108 | 29532 | + struct au_hdentry *hdp; |
1facf9fc | 29533 | + struct au_branch *br; |
076b876e | 29534 | + au_br_perm_str_t perm; |
1facf9fc | 29535 | + |
29536 | + err = 0; | |
5afbbe0d AM |
29537 | + bbot = au_sbbot(sb); |
29538 | + bindex = 0; | |
29539 | + hdp = au_hdentry(au_di(sb->s_root), bindex); | |
29540 | + for (; !err && bindex <= bbot; bindex++, hdp++) { | |
1facf9fc | 29541 | + br = au_sbr(sb, bindex); |
86dc4139 | 29542 | + path.mnt = au_br_mnt(br); |
5afbbe0d | 29543 | + path.dentry = hdp->hd_dentry; |
1facf9fc | 29544 | + err = au_seq_path(seq, &path); |
79b8bda9 | 29545 | + if (!err) { |
076b876e | 29546 | + au_optstr_br_perm(&perm, br->br_perm); |
79b8bda9 | 29547 | + seq_printf(seq, "=%s", perm.a); |
5afbbe0d | 29548 | + if (bindex != bbot) |
79b8bda9 | 29549 | + seq_putc(seq, ':'); |
1e00d052 | 29550 | + } |
1facf9fc | 29551 | + } |
79b8bda9 AM |
29552 | + if (unlikely(err || seq_has_overflowed(seq))) |
29553 | + err = -E2BIG; | |
1facf9fc | 29554 | + |
29555 | + return err; | |
29556 | +} | |
29557 | + | |
f2c43d5f AM |
29558 | +static void au_gen_fmt(char *fmt, int len __maybe_unused, const char *pat, |
29559 | + const char *append) | |
29560 | +{ | |
29561 | + char *p; | |
29562 | + | |
29563 | + p = fmt; | |
29564 | + while (*pat != ':') | |
29565 | + *p++ = *pat++; | |
29566 | + *p++ = *pat++; | |
29567 | + strcpy(p, append); | |
29568 | + AuDebugOn(strlen(fmt) >= len); | |
29569 | +} | |
29570 | + | |
1facf9fc | 29571 | +static void au_show_wbr_create(struct seq_file *m, int v, |
29572 | + struct au_sbinfo *sbinfo) | |
29573 | +{ | |
29574 | + const char *pat; | |
f2c43d5f AM |
29575 | + char fmt[32]; |
29576 | + struct au_wbr_mfs *mfs; | |
1facf9fc | 29577 | + |
dece6358 AM |
29578 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
29579 | + | |
c2b27bf2 | 29580 | + seq_puts(m, ",create="); |
1facf9fc | 29581 | + pat = au_optstr_wbr_create(v); |
f2c43d5f | 29582 | + mfs = &sbinfo->si_wbr_mfs; |
1facf9fc | 29583 | + switch (v) { |
29584 | + case AuWbrCreate_TDP: | |
29585 | + case AuWbrCreate_RR: | |
29586 | + case AuWbrCreate_MFS: | |
29587 | + case AuWbrCreate_PMFS: | |
c2b27bf2 | 29588 | + seq_puts(m, pat); |
1facf9fc | 29589 | + break; |
f2c43d5f AM |
29590 | + case AuWbrCreate_MFSRR: |
29591 | + case AuWbrCreate_TDMFS: | |
29592 | + case AuWbrCreate_PMFSRR: | |
29593 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%llu"); | |
29594 | + seq_printf(m, fmt, mfs->mfsrr_watermark); | |
1facf9fc | 29595 | + break; |
f2c43d5f | 29596 | + case AuWbrCreate_MFSV: |
1facf9fc | 29597 | + case AuWbrCreate_PMFSV: |
f2c43d5f AM |
29598 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%lu"); |
29599 | + seq_printf(m, fmt, | |
29600 | + jiffies_to_msecs(mfs->mfs_expire) | |
e49829fe | 29601 | + / MSEC_PER_SEC); |
1facf9fc | 29602 | + break; |
1facf9fc | 29603 | + case AuWbrCreate_MFSRRV: |
f2c43d5f | 29604 | + case AuWbrCreate_TDMFSV: |
392086de | 29605 | + case AuWbrCreate_PMFSRRV: |
f2c43d5f AM |
29606 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%llu:%lu"); |
29607 | + seq_printf(m, fmt, mfs->mfsrr_watermark, | |
29608 | + jiffies_to_msecs(mfs->mfs_expire) / MSEC_PER_SEC); | |
392086de | 29609 | + break; |
f2c43d5f AM |
29610 | + default: |
29611 | + BUG(); | |
1facf9fc | 29612 | + } |
29613 | +} | |
29614 | + | |
7eafdf33 | 29615 | +static int au_show_xino(struct seq_file *seq, struct super_block *sb) |
1facf9fc | 29616 | +{ |
29617 | +#ifdef CONFIG_SYSFS | |
29618 | + return 0; | |
29619 | +#else | |
29620 | + int err; | |
29621 | + const int len = sizeof(AUFS_XINO_FNAME) - 1; | |
29622 | + aufs_bindex_t bindex, brid; | |
1facf9fc | 29623 | + struct qstr *name; |
29624 | + struct file *f; | |
29625 | + struct dentry *d, *h_root; | |
acd2b654 | 29626 | + struct au_branch *br; |
1facf9fc | 29627 | + |
dece6358 AM |
29628 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
29629 | + | |
1facf9fc | 29630 | + err = 0; |
1facf9fc | 29631 | + f = au_sbi(sb)->si_xib; |
29632 | + if (!f) | |
29633 | + goto out; | |
29634 | + | |
29635 | + /* stop printing the default xino path on the first writable branch */ | |
29636 | + h_root = NULL; | |
acd2b654 AM |
29637 | + bindex = au_xi_root(sb, f->f_path.dentry); |
29638 | + if (bindex >= 0) { | |
29639 | + br = au_sbr_sb(sb, bindex); | |
29640 | + h_root = au_br_dentry(br); | |
1facf9fc | 29641 | + } |
acd2b654 | 29642 | + |
2000de60 | 29643 | + d = f->f_path.dentry; |
1facf9fc | 29644 | + name = &d->d_name; |
29645 | + /* safe ->d_parent because the file is unlinked */ | |
29646 | + if (d->d_parent == h_root | |
29647 | + && name->len == len | |
29648 | + && !memcmp(name->name, AUFS_XINO_FNAME, len)) | |
29649 | + goto out; | |
29650 | + | |
29651 | + seq_puts(seq, ",xino="); | |
29652 | + err = au_xino_path(seq, f); | |
29653 | + | |
4f0767ce | 29654 | +out: |
1facf9fc | 29655 | + return err; |
29656 | +#endif | |
29657 | +} | |
29658 | + | |
29659 | +/* seq_file will re-call me in case of too long string */ | |
7eafdf33 | 29660 | +static int aufs_show_options(struct seq_file *m, struct dentry *dentry) |
1facf9fc | 29661 | +{ |
027c5e7a | 29662 | + int err; |
1facf9fc | 29663 | + unsigned int mnt_flags, v; |
29664 | + struct super_block *sb; | |
29665 | + struct au_sbinfo *sbinfo; | |
29666 | + | |
29667 | +#define AuBool(name, str) do { \ | |
29668 | + v = au_opt_test(mnt_flags, name); \ | |
29669 | + if (v != au_opt_test(AuOpt_Def, name)) \ | |
29670 | + seq_printf(m, ",%s" #str, v ? "" : "no"); \ | |
29671 | +} while (0) | |
29672 | + | |
29673 | +#define AuStr(name, str) do { \ | |
29674 | + v = mnt_flags & AuOptMask_##name; \ | |
29675 | + if (v != (AuOpt_Def & AuOptMask_##name)) \ | |
29676 | + seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \ | |
29677 | +} while (0) | |
29678 | + | |
29679 | +#define AuUInt(name, str, val) do { \ | |
29680 | + if (val != AUFS_##name##_DEF) \ | |
29681 | + seq_printf(m, "," #str "=%u", val); \ | |
29682 | +} while (0) | |
29683 | + | |
7eafdf33 | 29684 | + sb = dentry->d_sb; |
2121bcd9 | 29685 | + if (sb->s_flags & SB_POSIXACL) |
c1595e42 | 29686 | + seq_puts(m, ",acl"); |
43982f53 | 29687 | +#if 0 /* reserved for future use */ |
be118d29 JR |
29688 | + if (sb->s_flags & SB_I_VERSION) |
29689 | + seq_puts(m, ",i_version"); | |
29690 | +#endif | |
c1595e42 JR |
29691 | + |
29692 | + /* lock free root dinfo */ | |
1facf9fc | 29693 | + si_noflush_read_lock(sb); |
29694 | + sbinfo = au_sbi(sb); | |
29695 | + seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo)); | |
29696 | + | |
29697 | + mnt_flags = au_mntflags(sb); | |
29698 | + if (au_opt_test(mnt_flags, XINO)) { | |
7eafdf33 | 29699 | + err = au_show_xino(m, sb); |
1facf9fc | 29700 | + if (unlikely(err)) |
29701 | + goto out; | |
29702 | + } else | |
29703 | + seq_puts(m, ",noxino"); | |
29704 | + | |
29705 | + AuBool(TRUNC_XINO, trunc_xino); | |
29706 | + AuStr(UDBA, udba); | |
dece6358 | 29707 | + AuBool(SHWH, shwh); |
1facf9fc | 29708 | + AuBool(PLINK, plink); |
4a4d8108 | 29709 | + AuBool(DIO, dio); |
076b876e | 29710 | + AuBool(DIRPERM1, dirperm1); |
1facf9fc | 29711 | + |
29712 | + v = sbinfo->si_wbr_create; | |
29713 | + if (v != AuWbrCreate_Def) | |
29714 | + au_show_wbr_create(m, v, sbinfo); | |
29715 | + | |
29716 | + v = sbinfo->si_wbr_copyup; | |
29717 | + if (v != AuWbrCopyup_Def) | |
29718 | + seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v)); | |
29719 | + | |
29720 | + v = au_opt_test(mnt_flags, ALWAYS_DIROPQ); | |
29721 | + if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ)) | |
29722 | + seq_printf(m, ",diropq=%c", v ? 'a' : 'w'); | |
29723 | + | |
29724 | + AuUInt(DIRWH, dirwh, sbinfo->si_dirwh); | |
29725 | + | |
027c5e7a AM |
29726 | + v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC; |
29727 | + AuUInt(RDCACHE, rdcache, v); | |
1facf9fc | 29728 | + |
29729 | + AuUInt(RDBLK, rdblk, sbinfo->si_rdblk); | |
29730 | + AuUInt(RDHASH, rdhash, sbinfo->si_rdhash); | |
29731 | + | |
076b876e AM |
29732 | + au_fhsm_show(m, sbinfo); |
29733 | + | |
8b6a4947 | 29734 | + AuBool(DIRREN, dirren); |
1facf9fc | 29735 | + AuBool(SUM, sum); |
29736 | + /* AuBool(SUM_W, wsum); */ | |
29737 | + AuBool(WARN_PERM, warn_perm); | |
29738 | + AuBool(VERBOSE, verbose); | |
29739 | + | |
4f0767ce | 29740 | +out: |
1facf9fc | 29741 | + /* be sure to print "br:" last */ |
29742 | + if (!sysaufs_brs) { | |
29743 | + seq_puts(m, ",br:"); | |
29744 | + au_show_brs(m, sb); | |
29745 | + } | |
29746 | + si_read_unlock(sb); | |
29747 | + return 0; | |
29748 | + | |
1facf9fc | 29749 | +#undef AuBool |
29750 | +#undef AuStr | |
4a4d8108 | 29751 | +#undef AuUInt |
1facf9fc | 29752 | +} |
29753 | + | |
29754 | +/* ---------------------------------------------------------------------- */ | |
29755 | + | |
29756 | +/* sum mode which returns the summation for statfs(2) */ | |
29757 | + | |
29758 | +static u64 au_add_till_max(u64 a, u64 b) | |
29759 | +{ | |
29760 | + u64 old; | |
29761 | + | |
29762 | + old = a; | |
29763 | + a += b; | |
92d182d2 AM |
29764 | + if (old <= a) |
29765 | + return a; | |
29766 | + return ULLONG_MAX; | |
29767 | +} | |
29768 | + | |
29769 | +static u64 au_mul_till_max(u64 a, long mul) | |
29770 | +{ | |
29771 | + u64 old; | |
29772 | + | |
29773 | + old = a; | |
29774 | + a *= mul; | |
29775 | + if (old <= a) | |
1facf9fc | 29776 | + return a; |
29777 | + return ULLONG_MAX; | |
29778 | +} | |
29779 | + | |
29780 | +static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf) | |
29781 | +{ | |
29782 | + int err; | |
92d182d2 | 29783 | + long bsize, factor; |
1facf9fc | 29784 | + u64 blocks, bfree, bavail, files, ffree; |
5afbbe0d | 29785 | + aufs_bindex_t bbot, bindex, i; |
1facf9fc | 29786 | + unsigned char shared; |
7f207e10 | 29787 | + struct path h_path; |
1facf9fc | 29788 | + struct super_block *h_sb; |
29789 | + | |
92d182d2 AM |
29790 | + err = 0; |
29791 | + bsize = LONG_MAX; | |
29792 | + files = 0; | |
29793 | + ffree = 0; | |
1facf9fc | 29794 | + blocks = 0; |
29795 | + bfree = 0; | |
29796 | + bavail = 0; | |
5afbbe0d AM |
29797 | + bbot = au_sbbot(sb); |
29798 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
7f207e10 AM |
29799 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
29800 | + h_sb = h_path.mnt->mnt_sb; | |
1facf9fc | 29801 | + shared = 0; |
92d182d2 | 29802 | + for (i = 0; !shared && i < bindex; i++) |
1facf9fc | 29803 | + shared = (au_sbr_sb(sb, i) == h_sb); |
29804 | + if (shared) | |
29805 | + continue; | |
29806 | + | |
29807 | + /* sb->s_root for NFS is unreliable */ | |
7f207e10 AM |
29808 | + h_path.dentry = h_path.mnt->mnt_root; |
29809 | + err = vfs_statfs(&h_path, buf); | |
1facf9fc | 29810 | + if (unlikely(err)) |
29811 | + goto out; | |
29812 | + | |
92d182d2 AM |
29813 | + if (bsize > buf->f_bsize) { |
29814 | + /* | |
29815 | + * we will reduce bsize, so we have to expand blocks | |
29816 | + * etc. to match them again | |
29817 | + */ | |
29818 | + factor = (bsize / buf->f_bsize); | |
29819 | + blocks = au_mul_till_max(blocks, factor); | |
29820 | + bfree = au_mul_till_max(bfree, factor); | |
29821 | + bavail = au_mul_till_max(bavail, factor); | |
29822 | + bsize = buf->f_bsize; | |
29823 | + } | |
29824 | + | |
29825 | + factor = (buf->f_bsize / bsize); | |
29826 | + blocks = au_add_till_max(blocks, | |
29827 | + au_mul_till_max(buf->f_blocks, factor)); | |
29828 | + bfree = au_add_till_max(bfree, | |
29829 | + au_mul_till_max(buf->f_bfree, factor)); | |
29830 | + bavail = au_add_till_max(bavail, | |
29831 | + au_mul_till_max(buf->f_bavail, factor)); | |
1facf9fc | 29832 | + files = au_add_till_max(files, buf->f_files); |
29833 | + ffree = au_add_till_max(ffree, buf->f_ffree); | |
29834 | + } | |
29835 | + | |
92d182d2 | 29836 | + buf->f_bsize = bsize; |
1facf9fc | 29837 | + buf->f_blocks = blocks; |
29838 | + buf->f_bfree = bfree; | |
29839 | + buf->f_bavail = bavail; | |
29840 | + buf->f_files = files; | |
29841 | + buf->f_ffree = ffree; | |
92d182d2 | 29842 | + buf->f_frsize = 0; |
1facf9fc | 29843 | + |
4f0767ce | 29844 | +out: |
1facf9fc | 29845 | + return err; |
29846 | +} | |
29847 | + | |
29848 | +static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
29849 | +{ | |
29850 | + int err; | |
7f207e10 | 29851 | + struct path h_path; |
1facf9fc | 29852 | + struct super_block *sb; |
29853 | + | |
29854 | + /* lock free root dinfo */ | |
29855 | + sb = dentry->d_sb; | |
29856 | + si_noflush_read_lock(sb); | |
7f207e10 | 29857 | + if (!au_opt_test(au_mntflags(sb), SUM)) { |
1facf9fc | 29858 | + /* sb->s_root for NFS is unreliable */ |
7f207e10 AM |
29859 | + h_path.mnt = au_sbr_mnt(sb, 0); |
29860 | + h_path.dentry = h_path.mnt->mnt_root; | |
29861 | + err = vfs_statfs(&h_path, buf); | |
29862 | + } else | |
1facf9fc | 29863 | + err = au_statfs_sum(sb, buf); |
29864 | + si_read_unlock(sb); | |
29865 | + | |
29866 | + if (!err) { | |
29867 | + buf->f_type = AUFS_SUPER_MAGIC; | |
4a4d8108 | 29868 | + buf->f_namelen = AUFS_MAX_NAMELEN; |
1facf9fc | 29869 | + memset(&buf->f_fsid, 0, sizeof(buf->f_fsid)); |
29870 | + } | |
29871 | + /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */ | |
29872 | + | |
29873 | + return err; | |
29874 | +} | |
29875 | + | |
29876 | +/* ---------------------------------------------------------------------- */ | |
29877 | + | |
537831f9 AM |
29878 | +static int aufs_sync_fs(struct super_block *sb, int wait) |
29879 | +{ | |
29880 | + int err, e; | |
5afbbe0d | 29881 | + aufs_bindex_t bbot, bindex; |
537831f9 AM |
29882 | + struct au_branch *br; |
29883 | + struct super_block *h_sb; | |
29884 | + | |
29885 | + err = 0; | |
29886 | + si_noflush_read_lock(sb); | |
5afbbe0d AM |
29887 | + bbot = au_sbbot(sb); |
29888 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
537831f9 AM |
29889 | + br = au_sbr(sb, bindex); |
29890 | + if (!au_br_writable(br->br_perm)) | |
29891 | + continue; | |
29892 | + | |
29893 | + h_sb = au_sbr_sb(sb, bindex); | |
a2654f78 AM |
29894 | + e = vfsub_sync_filesystem(h_sb, wait); |
29895 | + if (unlikely(e && !err)) | |
29896 | + err = e; | |
29897 | + /* go on even if an error happens */ | |
537831f9 AM |
29898 | + } |
29899 | + si_read_unlock(sb); | |
29900 | + | |
29901 | + return err; | |
29902 | +} | |
29903 | + | |
29904 | +/* ---------------------------------------------------------------------- */ | |
29905 | + | |
1facf9fc | 29906 | +/* final actions when unmounting a file system */ |
29907 | +static void aufs_put_super(struct super_block *sb) | |
29908 | +{ | |
29909 | + struct au_sbinfo *sbinfo; | |
29910 | + | |
29911 | + sbinfo = au_sbi(sb); | |
062440b3 AM |
29912 | + if (sbinfo) |
29913 | + kobject_put(&sbinfo->si_kobj); | |
1facf9fc | 29914 | +} |
29915 | + | |
29916 | +/* ---------------------------------------------------------------------- */ | |
29917 | + | |
79b8bda9 AM |
29918 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, |
29919 | + struct super_block *sb, void *arg) | |
7f207e10 AM |
29920 | +{ |
29921 | + void *array; | |
076b876e | 29922 | + unsigned long long n, sz; |
7f207e10 AM |
29923 | + |
29924 | + array = NULL; | |
29925 | + n = 0; | |
29926 | + if (!*hint) | |
29927 | + goto out; | |
29928 | + | |
29929 | + if (*hint > ULLONG_MAX / sizeof(array)) { | |
29930 | + array = ERR_PTR(-EMFILE); | |
29931 | + pr_err("hint %llu\n", *hint); | |
29932 | + goto out; | |
29933 | + } | |
29934 | + | |
076b876e AM |
29935 | + sz = sizeof(array) * *hint; |
29936 | + array = kzalloc(sz, GFP_NOFS); | |
7f207e10 | 29937 | + if (unlikely(!array)) |
076b876e | 29938 | + array = vzalloc(sz); |
7f207e10 AM |
29939 | + if (unlikely(!array)) { |
29940 | + array = ERR_PTR(-ENOMEM); | |
29941 | + goto out; | |
29942 | + } | |
29943 | + | |
79b8bda9 | 29944 | + n = cb(sb, array, *hint, arg); |
7f207e10 AM |
29945 | + AuDebugOn(n > *hint); |
29946 | + | |
29947 | +out: | |
29948 | + *hint = n; | |
29949 | + return array; | |
29950 | +} | |
29951 | + | |
79b8bda9 | 29952 | +static unsigned long long au_iarray_cb(struct super_block *sb, void *a, |
7f207e10 AM |
29953 | + unsigned long long max __maybe_unused, |
29954 | + void *arg) | |
29955 | +{ | |
29956 | + unsigned long long n; | |
29957 | + struct inode **p, *inode; | |
29958 | + struct list_head *head; | |
29959 | + | |
29960 | + n = 0; | |
29961 | + p = a; | |
29962 | + head = arg; | |
79b8bda9 | 29963 | + spin_lock(&sb->s_inode_list_lock); |
7f207e10 | 29964 | + list_for_each_entry(inode, head, i_sb_list) { |
5afbbe0d AM |
29965 | + if (!au_is_bad_inode(inode) |
29966 | + && au_ii(inode)->ii_btop >= 0) { | |
2cbb1c4b JR |
29967 | + spin_lock(&inode->i_lock); |
29968 | + if (atomic_read(&inode->i_count)) { | |
29969 | + au_igrab(inode); | |
29970 | + *p++ = inode; | |
29971 | + n++; | |
29972 | + AuDebugOn(n > max); | |
29973 | + } | |
29974 | + spin_unlock(&inode->i_lock); | |
7f207e10 AM |
29975 | + } |
29976 | + } | |
79b8bda9 | 29977 | + spin_unlock(&sb->s_inode_list_lock); |
7f207e10 AM |
29978 | + |
29979 | + return n; | |
29980 | +} | |
29981 | + | |
29982 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max) | |
29983 | +{ | |
acd2b654 AM |
29984 | + struct au_sbinfo *sbi; |
29985 | + | |
29986 | + sbi = au_sbi(sb); | |
29987 | + *max = au_lcnt_read(&sbi->si_ninodes, /*do_rev*/1); | |
79b8bda9 | 29988 | + return au_array_alloc(max, au_iarray_cb, sb, &sb->s_inodes); |
7f207e10 AM |
29989 | +} |
29990 | + | |
29991 | +void au_iarray_free(struct inode **a, unsigned long long max) | |
29992 | +{ | |
29993 | + unsigned long long ull; | |
29994 | + | |
29995 | + for (ull = 0; ull < max; ull++) | |
29996 | + iput(a[ull]); | |
be52b249 | 29997 | + kvfree(a); |
7f207e10 AM |
29998 | +} |
29999 | + | |
30000 | +/* ---------------------------------------------------------------------- */ | |
30001 | + | |
1facf9fc | 30002 | +/* |
30003 | + * refresh dentry and inode at remount time. | |
30004 | + */ | |
027c5e7a AM |
30005 | +/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */ |
30006 | +static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags, | |
30007 | + struct dentry *parent) | |
1facf9fc | 30008 | +{ |
30009 | + int err; | |
1facf9fc | 30010 | + |
30011 | + di_write_lock_child(dentry); | |
1facf9fc | 30012 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a AM |
30013 | + err = au_refresh_dentry(dentry, parent); |
30014 | + if (!err && dir_flags) | |
5527c038 | 30015 | + au_hn_reset(d_inode(dentry), dir_flags); |
1facf9fc | 30016 | + di_read_unlock(parent, AuLock_IR); |
1facf9fc | 30017 | + di_write_unlock(dentry); |
30018 | + | |
30019 | + return err; | |
30020 | +} | |
30021 | + | |
027c5e7a AM |
30022 | +static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen, |
30023 | + struct au_sbinfo *sbinfo, | |
b95c5147 | 30024 | + const unsigned int dir_flags, unsigned int do_idop) |
1facf9fc | 30025 | +{ |
027c5e7a AM |
30026 | + int err; |
30027 | + struct dentry *parent; | |
027c5e7a AM |
30028 | + |
30029 | + err = 0; | |
30030 | + parent = dget_parent(dentry); | |
30031 | + if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) { | |
5527c038 JR |
30032 | + if (d_really_is_positive(dentry)) { |
30033 | + if (!d_is_dir(dentry)) | |
027c5e7a AM |
30034 | + err = au_do_refresh(dentry, /*dir_flags*/0, |
30035 | + parent); | |
30036 | + else { | |
30037 | + err = au_do_refresh(dentry, dir_flags, parent); | |
30038 | + if (unlikely(err)) | |
30039 | + au_fset_si(sbinfo, FAILED_REFRESH_DIR); | |
30040 | + } | |
30041 | + } else | |
30042 | + err = au_do_refresh(dentry, /*dir_flags*/0, parent); | |
30043 | + AuDbgDentry(dentry); | |
30044 | + } | |
30045 | + dput(parent); | |
30046 | + | |
79b8bda9 | 30047 | + if (!err) { |
b95c5147 | 30048 | + if (do_idop) |
79b8bda9 AM |
30049 | + au_refresh_dop(dentry, /*force_reval*/0); |
30050 | + } else | |
30051 | + au_refresh_dop(dentry, /*force_reval*/1); | |
30052 | + | |
027c5e7a AM |
30053 | + AuTraceErr(err); |
30054 | + return err; | |
1facf9fc | 30055 | +} |
30056 | + | |
b95c5147 | 30057 | +static int au_refresh_d(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 30058 | +{ |
30059 | + int err, i, j, ndentry, e; | |
027c5e7a | 30060 | + unsigned int sigen; |
1facf9fc | 30061 | + struct au_dcsub_pages dpages; |
30062 | + struct au_dpage *dpage; | |
027c5e7a AM |
30063 | + struct dentry **dentries, *d; |
30064 | + struct au_sbinfo *sbinfo; | |
30065 | + struct dentry *root = sb->s_root; | |
5527c038 | 30066 | + const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1); |
1facf9fc | 30067 | + |
b95c5147 | 30068 | + if (do_idop) |
79b8bda9 AM |
30069 | + au_refresh_dop(root, /*force_reval*/0); |
30070 | + | |
027c5e7a AM |
30071 | + err = au_dpages_init(&dpages, GFP_NOFS); |
30072 | + if (unlikely(err)) | |
1facf9fc | 30073 | + goto out; |
027c5e7a AM |
30074 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); |
30075 | + if (unlikely(err)) | |
1facf9fc | 30076 | + goto out_dpages; |
1facf9fc | 30077 | + |
027c5e7a AM |
30078 | + sigen = au_sigen(sb); |
30079 | + sbinfo = au_sbi(sb); | |
30080 | + for (i = 0; i < dpages.ndpage; i++) { | |
1facf9fc | 30081 | + dpage = dpages.dpages + i; |
30082 | + dentries = dpage->dentries; | |
30083 | + ndentry = dpage->ndentry; | |
027c5e7a | 30084 | + for (j = 0; j < ndentry; j++) { |
1facf9fc | 30085 | + d = dentries[j]; |
79b8bda9 | 30086 | + e = au_do_refresh_d(d, sigen, sbinfo, dir_flags, |
b95c5147 | 30087 | + do_idop); |
027c5e7a AM |
30088 | + if (unlikely(e && !err)) |
30089 | + err = e; | |
30090 | + /* go on even err */ | |
1facf9fc | 30091 | + } |
30092 | + } | |
30093 | + | |
4f0767ce | 30094 | +out_dpages: |
1facf9fc | 30095 | + au_dpages_free(&dpages); |
4f0767ce | 30096 | +out: |
1facf9fc | 30097 | + return err; |
30098 | +} | |
30099 | + | |
b95c5147 | 30100 | +static int au_refresh_i(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 30101 | +{ |
027c5e7a AM |
30102 | + int err, e; |
30103 | + unsigned int sigen; | |
30104 | + unsigned long long max, ull; | |
30105 | + struct inode *inode, **array; | |
1facf9fc | 30106 | + |
027c5e7a AM |
30107 | + array = au_iarray_alloc(sb, &max); |
30108 | + err = PTR_ERR(array); | |
30109 | + if (IS_ERR(array)) | |
30110 | + goto out; | |
1facf9fc | 30111 | + |
30112 | + err = 0; | |
027c5e7a AM |
30113 | + sigen = au_sigen(sb); |
30114 | + for (ull = 0; ull < max; ull++) { | |
30115 | + inode = array[ull]; | |
076b876e AM |
30116 | + if (unlikely(!inode)) |
30117 | + break; | |
b95c5147 AM |
30118 | + |
30119 | + e = 0; | |
30120 | + ii_write_lock_child(inode); | |
537831f9 | 30121 | + if (au_iigen(inode, NULL) != sigen) { |
027c5e7a | 30122 | + e = au_refresh_hinode_self(inode); |
1facf9fc | 30123 | + if (unlikely(e)) { |
b95c5147 | 30124 | + au_refresh_iop(inode, /*force_getattr*/1); |
027c5e7a | 30125 | + pr_err("error %d, i%lu\n", e, inode->i_ino); |
1facf9fc | 30126 | + if (!err) |
30127 | + err = e; | |
30128 | + /* go on even if err */ | |
30129 | + } | |
30130 | + } | |
b95c5147 AM |
30131 | + if (!e && do_idop) |
30132 | + au_refresh_iop(inode, /*force_getattr*/0); | |
30133 | + ii_write_unlock(inode); | |
1facf9fc | 30134 | + } |
30135 | + | |
027c5e7a | 30136 | + au_iarray_free(array, max); |
1facf9fc | 30137 | + |
4f0767ce | 30138 | +out: |
1facf9fc | 30139 | + return err; |
30140 | +} | |
30141 | + | |
b95c5147 | 30142 | +static void au_remount_refresh(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 30143 | +{ |
027c5e7a AM |
30144 | + int err, e; |
30145 | + unsigned int udba; | |
5afbbe0d | 30146 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 30147 | + struct dentry *root; |
30148 | + struct inode *inode; | |
027c5e7a | 30149 | + struct au_branch *br; |
79b8bda9 | 30150 | + struct au_sbinfo *sbi; |
1facf9fc | 30151 | + |
30152 | + au_sigen_inc(sb); | |
79b8bda9 AM |
30153 | + sbi = au_sbi(sb); |
30154 | + au_fclr_si(sbi, FAILED_REFRESH_DIR); | |
1facf9fc | 30155 | + |
30156 | + root = sb->s_root; | |
30157 | + DiMustNoWaiters(root); | |
5527c038 | 30158 | + inode = d_inode(root); |
1facf9fc | 30159 | + IiMustNoWaiters(inode); |
1facf9fc | 30160 | + |
027c5e7a | 30161 | + udba = au_opt_udba(sb); |
5afbbe0d AM |
30162 | + bbot = au_sbbot(sb); |
30163 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
027c5e7a AM |
30164 | + br = au_sbr(sb, bindex); |
30165 | + err = au_hnotify_reset_br(udba, br, br->br_perm); | |
1facf9fc | 30166 | + if (unlikely(err)) |
027c5e7a AM |
30167 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", |
30168 | + bindex, err); | |
30169 | + /* go on even if err */ | |
1facf9fc | 30170 | + } |
027c5e7a | 30171 | + au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1)); |
1facf9fc | 30172 | + |
b95c5147 | 30173 | + if (do_idop) { |
79b8bda9 AM |
30174 | + if (au_ftest_si(sbi, NO_DREVAL)) { |
30175 | + AuDebugOn(sb->s_d_op == &aufs_dop_noreval); | |
30176 | + sb->s_d_op = &aufs_dop_noreval; | |
b95c5147 AM |
30177 | + AuDebugOn(sbi->si_iop_array == aufs_iop_nogetattr); |
30178 | + sbi->si_iop_array = aufs_iop_nogetattr; | |
79b8bda9 AM |
30179 | + } else { |
30180 | + AuDebugOn(sb->s_d_op == &aufs_dop); | |
30181 | + sb->s_d_op = &aufs_dop; | |
b95c5147 AM |
30182 | + AuDebugOn(sbi->si_iop_array == aufs_iop); |
30183 | + sbi->si_iop_array = aufs_iop; | |
79b8bda9 | 30184 | + } |
062440b3 | 30185 | + pr_info("reset to %ps and %ps\n", |
b95c5147 | 30186 | + sb->s_d_op, sbi->si_iop_array); |
79b8bda9 AM |
30187 | + } |
30188 | + | |
027c5e7a | 30189 | + di_write_unlock(root); |
b95c5147 AM |
30190 | + err = au_refresh_d(sb, do_idop); |
30191 | + e = au_refresh_i(sb, do_idop); | |
027c5e7a AM |
30192 | + if (unlikely(e && !err)) |
30193 | + err = e; | |
1facf9fc | 30194 | + /* aufs_write_lock() calls ..._child() */ |
30195 | + di_write_lock_child(root); | |
027c5e7a AM |
30196 | + |
30197 | + au_cpup_attr_all(inode, /*force*/1); | |
30198 | + | |
30199 | + if (unlikely(err)) | |
30200 | + AuIOErr("refresh failed, ignored, %d\n", err); | |
1facf9fc | 30201 | +} |
30202 | + | |
30203 | +/* stop extra interpretation of errno in mount(8), and strange error messages */ | |
30204 | +static int cvt_err(int err) | |
30205 | +{ | |
30206 | + AuTraceErr(err); | |
30207 | + | |
30208 | + switch (err) { | |
30209 | + case -ENOENT: | |
30210 | + case -ENOTDIR: | |
30211 | + case -EEXIST: | |
30212 | + case -EIO: | |
30213 | + err = -EINVAL; | |
30214 | + } | |
30215 | + return err; | |
30216 | +} | |
30217 | + | |
30218 | +static int aufs_remount_fs(struct super_block *sb, int *flags, char *data) | |
30219 | +{ | |
4a4d8108 AM |
30220 | + int err, do_dx; |
30221 | + unsigned int mntflags; | |
be52b249 AM |
30222 | + struct au_opts opts = { |
30223 | + .opt = NULL | |
30224 | + }; | |
1facf9fc | 30225 | + struct dentry *root; |
30226 | + struct inode *inode; | |
30227 | + struct au_sbinfo *sbinfo; | |
30228 | + | |
30229 | + err = 0; | |
30230 | + root = sb->s_root; | |
30231 | + if (!data || !*data) { | |
e49829fe JR |
30232 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
30233 | + if (!err) { | |
30234 | + di_write_lock_child(root); | |
30235 | + err = au_opts_verify(sb, *flags, /*pending*/0); | |
30236 | + aufs_write_unlock(root); | |
30237 | + } | |
1facf9fc | 30238 | + goto out; |
30239 | + } | |
30240 | + | |
30241 | + err = -ENOMEM; | |
1facf9fc | 30242 | + opts.opt = (void *)__get_free_page(GFP_NOFS); |
30243 | + if (unlikely(!opts.opt)) | |
30244 | + goto out; | |
30245 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
30246 | + opts.flags = AuOpts_REMOUNT; | |
30247 | + opts.sb_flags = *flags; | |
30248 | + | |
30249 | + /* parse it before aufs lock */ | |
30250 | + err = au_opts_parse(sb, data, &opts); | |
30251 | + if (unlikely(err)) | |
30252 | + goto out_opts; | |
30253 | + | |
30254 | + sbinfo = au_sbi(sb); | |
5527c038 | 30255 | + inode = d_inode(root); |
febd17d6 | 30256 | + inode_lock(inode); |
e49829fe JR |
30257 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
30258 | + if (unlikely(err)) | |
30259 | + goto out_mtx; | |
30260 | + di_write_lock_child(root); | |
1facf9fc | 30261 | + |
30262 | + /* au_opts_remount() may return an error */ | |
30263 | + err = au_opts_remount(sb, &opts); | |
30264 | + au_opts_free(&opts); | |
30265 | + | |
027c5e7a | 30266 | + if (au_ftest_opts(opts.flags, REFRESH)) |
b95c5147 | 30267 | + au_remount_refresh(sb, au_ftest_opts(opts.flags, REFRESH_IDOP)); |
1facf9fc | 30268 | + |
4a4d8108 AM |
30269 | + if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) { |
30270 | + mntflags = au_mntflags(sb); | |
30271 | + do_dx = !!au_opt_test(mntflags, DIO); | |
30272 | + au_dy_arefresh(do_dx); | |
30273 | + } | |
30274 | + | |
076b876e | 30275 | + au_fhsm_wrote_all(sb, /*force*/1); /* ?? */ |
1facf9fc | 30276 | + aufs_write_unlock(root); |
953406b4 | 30277 | + |
e49829fe | 30278 | +out_mtx: |
febd17d6 | 30279 | + inode_unlock(inode); |
4f0767ce | 30280 | +out_opts: |
1c60b727 | 30281 | + free_page((unsigned long)opts.opt); |
4f0767ce | 30282 | +out: |
1facf9fc | 30283 | + err = cvt_err(err); |
30284 | + AuTraceErr(err); | |
30285 | + return err; | |
30286 | +} | |
30287 | + | |
4a4d8108 | 30288 | +static const struct super_operations aufs_sop = { |
1facf9fc | 30289 | + .alloc_inode = aufs_alloc_inode, |
30290 | + .destroy_inode = aufs_destroy_inode, | |
fbc438ed | 30291 | + .free_inode = aufs_free_inode, |
b752ccd1 | 30292 | + /* always deleting, no clearing */ |
1facf9fc | 30293 | + .drop_inode = generic_delete_inode, |
30294 | + .show_options = aufs_show_options, | |
30295 | + .statfs = aufs_statfs, | |
30296 | + .put_super = aufs_put_super, | |
537831f9 | 30297 | + .sync_fs = aufs_sync_fs, |
1facf9fc | 30298 | + .remount_fs = aufs_remount_fs |
30299 | +}; | |
30300 | + | |
30301 | +/* ---------------------------------------------------------------------- */ | |
30302 | + | |
30303 | +static int alloc_root(struct super_block *sb) | |
30304 | +{ | |
30305 | + int err; | |
30306 | + struct inode *inode; | |
30307 | + struct dentry *root; | |
30308 | + | |
30309 | + err = -ENOMEM; | |
30310 | + inode = au_iget_locked(sb, AUFS_ROOT_INO); | |
30311 | + err = PTR_ERR(inode); | |
30312 | + if (IS_ERR(inode)) | |
30313 | + goto out; | |
30314 | + | |
b95c5147 | 30315 | + inode->i_op = aufs_iop + AuIop_DIR; /* with getattr by default */ |
1facf9fc | 30316 | + inode->i_fop = &aufs_dir_fop; |
30317 | + inode->i_mode = S_IFDIR; | |
9dbd164d | 30318 | + set_nlink(inode, 2); |
1facf9fc | 30319 | + unlock_new_inode(inode); |
30320 | + | |
92d182d2 | 30321 | + root = d_make_root(inode); |
1facf9fc | 30322 | + if (unlikely(!root)) |
92d182d2 | 30323 | + goto out; |
1facf9fc | 30324 | + err = PTR_ERR(root); |
30325 | + if (IS_ERR(root)) | |
92d182d2 | 30326 | + goto out; |
1facf9fc | 30327 | + |
4a4d8108 | 30328 | + err = au_di_init(root); |
1facf9fc | 30329 | + if (!err) { |
30330 | + sb->s_root = root; | |
30331 | + return 0; /* success */ | |
30332 | + } | |
30333 | + dput(root); | |
1facf9fc | 30334 | + |
4f0767ce | 30335 | +out: |
1facf9fc | 30336 | + return err; |
1facf9fc | 30337 | +} |
30338 | + | |
30339 | +static int aufs_fill_super(struct super_block *sb, void *raw_data, | |
30340 | + int silent __maybe_unused) | |
30341 | +{ | |
30342 | + int err; | |
be52b249 AM |
30343 | + struct au_opts opts = { |
30344 | + .opt = NULL | |
30345 | + }; | |
79b8bda9 | 30346 | + struct au_sbinfo *sbinfo; |
1facf9fc | 30347 | + struct dentry *root; |
30348 | + struct inode *inode; | |
30349 | + char *arg = raw_data; | |
30350 | + | |
30351 | + if (unlikely(!arg || !*arg)) { | |
30352 | + err = -EINVAL; | |
4a4d8108 | 30353 | + pr_err("no arg\n"); |
1facf9fc | 30354 | + goto out; |
30355 | + } | |
30356 | + | |
30357 | + err = -ENOMEM; | |
1facf9fc | 30358 | + opts.opt = (void *)__get_free_page(GFP_NOFS); |
30359 | + if (unlikely(!opts.opt)) | |
30360 | + goto out; | |
30361 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
30362 | + opts.sb_flags = sb->s_flags; | |
30363 | + | |
30364 | + err = au_si_alloc(sb); | |
30365 | + if (unlikely(err)) | |
30366 | + goto out_opts; | |
79b8bda9 | 30367 | + sbinfo = au_sbi(sb); |
1facf9fc | 30368 | + |
30369 | + /* all timestamps always follow the ones on the branch */ | |
2121bcd9 | 30370 | + sb->s_flags |= SB_NOATIME | SB_NODIRATIME; |
be118d29 | 30371 | + sb->s_flags |= SB_I_VERSION; /* do we really need this? */ |
1facf9fc | 30372 | + sb->s_op = &aufs_sop; |
027c5e7a | 30373 | + sb->s_d_op = &aufs_dop; |
1facf9fc | 30374 | + sb->s_magic = AUFS_SUPER_MAGIC; |
30375 | + sb->s_maxbytes = 0; | |
c1595e42 | 30376 | + sb->s_stack_depth = 1; |
1facf9fc | 30377 | + au_export_init(sb); |
f2c43d5f | 30378 | + au_xattr_init(sb); |
1facf9fc | 30379 | + |
30380 | + err = alloc_root(sb); | |
30381 | + if (unlikely(err)) { | |
30382 | + si_write_unlock(sb); | |
30383 | + goto out_info; | |
30384 | + } | |
30385 | + root = sb->s_root; | |
5527c038 | 30386 | + inode = d_inode(root); |
1facf9fc | 30387 | + |
30388 | + /* | |
30389 | + * actually we can parse options regardless aufs lock here. | |
30390 | + * but at remount time, parsing must be done before aufs lock. | |
30391 | + * so we follow the same rule. | |
30392 | + */ | |
30393 | + ii_write_lock_parent(inode); | |
30394 | + aufs_write_unlock(root); | |
30395 | + err = au_opts_parse(sb, arg, &opts); | |
30396 | + if (unlikely(err)) | |
30397 | + goto out_root; | |
30398 | + | |
30399 | + /* lock vfs_inode first, then aufs. */ | |
febd17d6 | 30400 | + inode_lock(inode); |
1facf9fc | 30401 | + aufs_write_lock(root); |
30402 | + err = au_opts_mount(sb, &opts); | |
30403 | + au_opts_free(&opts); | |
79b8bda9 AM |
30404 | + if (!err && au_ftest_si(sbinfo, NO_DREVAL)) { |
30405 | + sb->s_d_op = &aufs_dop_noreval; | |
062440b3 | 30406 | + pr_info("%ps\n", sb->s_d_op); |
79b8bda9 | 30407 | + au_refresh_dop(root, /*force_reval*/0); |
b95c5147 AM |
30408 | + sbinfo->si_iop_array = aufs_iop_nogetattr; |
30409 | + au_refresh_iop(inode, /*force_getattr*/0); | |
79b8bda9 | 30410 | + } |
1facf9fc | 30411 | + aufs_write_unlock(root); |
febd17d6 | 30412 | + inode_unlock(inode); |
4a4d8108 AM |
30413 | + if (!err) |
30414 | + goto out_opts; /* success */ | |
1facf9fc | 30415 | + |
4f0767ce | 30416 | +out_root: |
1facf9fc | 30417 | + dput(root); |
30418 | + sb->s_root = NULL; | |
4f0767ce | 30419 | +out_info: |
79b8bda9 | 30420 | + kobject_put(&sbinfo->si_kobj); |
1facf9fc | 30421 | + sb->s_fs_info = NULL; |
4f0767ce | 30422 | +out_opts: |
1c60b727 | 30423 | + free_page((unsigned long)opts.opt); |
4f0767ce | 30424 | +out: |
1facf9fc | 30425 | + AuTraceErr(err); |
30426 | + err = cvt_err(err); | |
30427 | + AuTraceErr(err); | |
30428 | + return err; | |
30429 | +} | |
30430 | + | |
30431 | +/* ---------------------------------------------------------------------- */ | |
30432 | + | |
027c5e7a AM |
30433 | +static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags, |
30434 | + const char *dev_name __maybe_unused, | |
30435 | + void *raw_data) | |
1facf9fc | 30436 | +{ |
027c5e7a | 30437 | + struct dentry *root; |
1facf9fc | 30438 | + |
30439 | + /* all timestamps always follow the ones on the branch */ | |
30440 | + /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */ | |
027c5e7a AM |
30441 | + root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super); |
30442 | + if (IS_ERR(root)) | |
30443 | + goto out; | |
30444 | + | |
062440b3 | 30445 | + au_sbilist_add(root->d_sb); |
027c5e7a AM |
30446 | + |
30447 | +out: | |
30448 | + return root; | |
1facf9fc | 30449 | +} |
30450 | + | |
e49829fe JR |
30451 | +static void aufs_kill_sb(struct super_block *sb) |
30452 | +{ | |
30453 | + struct au_sbinfo *sbinfo; | |
30454 | + | |
30455 | + sbinfo = au_sbi(sb); | |
30456 | + if (sbinfo) { | |
30457 | + au_sbilist_del(sb); | |
30458 | + aufs_write_lock(sb->s_root); | |
076b876e | 30459 | + au_fhsm_fin(sb); |
e49829fe JR |
30460 | + if (sbinfo->si_wbr_create_ops->fin) |
30461 | + sbinfo->si_wbr_create_ops->fin(sb); | |
30462 | + if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) { | |
30463 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE); | |
b95c5147 | 30464 | + au_remount_refresh(sb, /*do_idop*/0); |
e49829fe JR |
30465 | + } |
30466 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
30467 | + au_plink_put(sb, /*verbose*/1); | |
30468 | + au_xino_clr(sb); | |
8b6a4947 | 30469 | + au_dr_opt_flush(sb); |
1e00d052 | 30470 | + sbinfo->si_sb = NULL; |
e49829fe | 30471 | + aufs_write_unlock(sb->s_root); |
e49829fe JR |
30472 | + au_nwt_flush(&sbinfo->si_nowait); |
30473 | + } | |
98d9a5b1 | 30474 | + kill_anon_super(sb); |
e49829fe JR |
30475 | +} |
30476 | + | |
1facf9fc | 30477 | +struct file_system_type aufs_fs_type = { |
30478 | + .name = AUFS_FSTYPE, | |
c06a8ce3 AM |
30479 | + /* a race between rename and others */ |
30480 | + .fs_flags = FS_RENAME_DOES_D_MOVE, | |
027c5e7a | 30481 | + .mount = aufs_mount, |
e49829fe | 30482 | + .kill_sb = aufs_kill_sb, |
1facf9fc | 30483 | + /* no need to __module_get() and module_put(). */ |
30484 | + .owner = THIS_MODULE, | |
30485 | +}; | |
7f207e10 | 30486 | diff -urN /usr/share/empty/fs/aufs/super.h linux/fs/aufs/super.h |
eca34b5c | 30487 | --- /usr/share/empty/fs/aufs/super.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 30488 | +++ linux/fs/aufs/super.h 2020-01-27 10:57:18.178871751 +0100 |
acd2b654 | 30489 | @@ -0,0 +1,589 @@ |
062440b3 | 30490 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 30491 | +/* |
016522bc | 30492 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 30493 | + * |
30494 | + * This program, aufs is free software; you can redistribute it and/or modify | |
30495 | + * it under the terms of the GNU General Public License as published by | |
30496 | + * the Free Software Foundation; either version 2 of the License, or | |
30497 | + * (at your option) any later version. | |
dece6358 AM |
30498 | + * |
30499 | + * This program is distributed in the hope that it will be useful, | |
30500 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30501 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30502 | + * GNU General Public License for more details. | |
30503 | + * | |
30504 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 30505 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 30506 | + */ |
30507 | + | |
30508 | +/* | |
30509 | + * super_block operations | |
30510 | + */ | |
30511 | + | |
30512 | +#ifndef __AUFS_SUPER_H__ | |
30513 | +#define __AUFS_SUPER_H__ | |
30514 | + | |
30515 | +#ifdef __KERNEL__ | |
30516 | + | |
30517 | +#include <linux/fs.h> | |
5527c038 | 30518 | +#include <linux/kobject.h> |
8b6a4947 | 30519 | +#include "hbl.h" |
acd2b654 | 30520 | +#include "lcnt.h" |
1facf9fc | 30521 | +#include "rwsem.h" |
1facf9fc | 30522 | +#include "wkq.h" |
30523 | + | |
1facf9fc | 30524 | +/* policies to select one among multiple writable branches */ |
30525 | +struct au_wbr_copyup_operations { | |
30526 | + int (*copyup)(struct dentry *dentry); | |
30527 | +}; | |
30528 | + | |
392086de AM |
30529 | +#define AuWbr_DIR 1 /* target is a dir */ |
30530 | +#define AuWbr_PARENT (1 << 1) /* always require a parent */ | |
30531 | + | |
30532 | +#define au_ftest_wbr(flags, name) ((flags) & AuWbr_##name) | |
30533 | +#define au_fset_wbr(flags, name) { (flags) |= AuWbr_##name; } | |
30534 | +#define au_fclr_wbr(flags, name) { (flags) &= ~AuWbr_##name; } | |
30535 | + | |
1facf9fc | 30536 | +struct au_wbr_create_operations { |
392086de | 30537 | + int (*create)(struct dentry *dentry, unsigned int flags); |
1facf9fc | 30538 | + int (*init)(struct super_block *sb); |
30539 | + int (*fin)(struct super_block *sb); | |
30540 | +}; | |
30541 | + | |
30542 | +struct au_wbr_mfs { | |
30543 | + struct mutex mfs_lock; /* protect this structure */ | |
30544 | + unsigned long mfs_jiffy; | |
30545 | + unsigned long mfs_expire; | |
30546 | + aufs_bindex_t mfs_bindex; | |
30547 | + | |
30548 | + unsigned long long mfsrr_bytes; | |
30549 | + unsigned long long mfsrr_watermark; | |
30550 | +}; | |
30551 | + | |
86dc4139 AM |
30552 | +#define AuPlink_NHASH 100 |
30553 | +static inline int au_plink_hash(ino_t ino) | |
30554 | +{ | |
30555 | + return ino % AuPlink_NHASH; | |
30556 | +} | |
30557 | + | |
076b876e AM |
30558 | +/* File-based Hierarchical Storage Management */ |
30559 | +struct au_fhsm { | |
30560 | +#ifdef CONFIG_AUFS_FHSM | |
30561 | + /* allow only one process who can receive the notification */ | |
30562 | + spinlock_t fhsm_spin; | |
30563 | + pid_t fhsm_pid; | |
30564 | + wait_queue_head_t fhsm_wqh; | |
30565 | + atomic_t fhsm_readable; | |
30566 | + | |
c1595e42 | 30567 | + /* these are protected by si_rwsem */ |
076b876e | 30568 | + unsigned long fhsm_expire; |
c1595e42 | 30569 | + aufs_bindex_t fhsm_bottom; |
076b876e AM |
30570 | +#endif |
30571 | +}; | |
30572 | + | |
1facf9fc | 30573 | +struct au_branch; |
30574 | +struct au_sbinfo { | |
30575 | + /* nowait tasks in the system-wide workqueue */ | |
30576 | + struct au_nowait_tasks si_nowait; | |
30577 | + | |
b752ccd1 | 30578 | + /* |
acd2b654 | 30579 | + * tried sb->s_umount, but failed due to the dependency between i_mutex. |
b752ccd1 AM |
30580 | + * rwsem for au_sbinfo is necessary. |
30581 | + */ | |
dece6358 | 30582 | + struct au_rwsem si_rwsem; |
1facf9fc | 30583 | + |
7f207e10 | 30584 | + /* |
523b37e3 AM |
30585 | + * dirty approach to protect sb->sb_inodes and ->s_files (gone) from |
30586 | + * remount. | |
7f207e10 | 30587 | + */ |
acd2b654 | 30588 | + au_lcnt_t si_ninodes, si_nfiles; |
7f207e10 | 30589 | + |
1facf9fc | 30590 | + /* branch management */ |
30591 | + unsigned int si_generation; | |
30592 | + | |
2000de60 | 30593 | + /* see AuSi_ flags */ |
1facf9fc | 30594 | + unsigned char au_si_status; |
30595 | + | |
5afbbe0d | 30596 | + aufs_bindex_t si_bbot; |
7f207e10 AM |
30597 | + |
30598 | + /* dirty trick to keep br_id plus */ | |
30599 | + unsigned int si_last_br_id : | |
30600 | + sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1; | |
1facf9fc | 30601 | + struct au_branch **si_branch; |
30602 | + | |
30603 | + /* policy to select a writable branch */ | |
30604 | + unsigned char si_wbr_copyup; | |
30605 | + unsigned char si_wbr_create; | |
30606 | + struct au_wbr_copyup_operations *si_wbr_copyup_ops; | |
30607 | + struct au_wbr_create_operations *si_wbr_create_ops; | |
30608 | + | |
30609 | + /* round robin */ | |
30610 | + atomic_t si_wbr_rr_next; | |
30611 | + | |
30612 | + /* most free space */ | |
30613 | + struct au_wbr_mfs si_wbr_mfs; | |
30614 | + | |
076b876e AM |
30615 | + /* File-based Hierarchical Storage Management */ |
30616 | + struct au_fhsm si_fhsm; | |
30617 | + | |
1facf9fc | 30618 | + /* mount flags */ |
30619 | + /* include/asm-ia64/siginfo.h defines a macro named si_flags */ | |
30620 | + unsigned int si_mntflags; | |
30621 | + | |
30622 | + /* external inode number (bitmap and translation table) */ | |
5527c038 JR |
30623 | + vfs_readf_t si_xread; |
30624 | + vfs_writef_t si_xwrite; | |
acd2b654 AM |
30625 | + loff_t si_ximaxent; /* max entries in a xino */ |
30626 | + | |
1facf9fc | 30627 | + struct file *si_xib; |
30628 | + struct mutex si_xib_mtx; /* protect xib members */ | |
30629 | + unsigned long *si_xib_buf; | |
30630 | + unsigned long si_xib_last_pindex; | |
30631 | + int si_xib_next_bit; | |
acd2b654 | 30632 | + |
392086de AM |
30633 | + unsigned long si_xino_jiffy; |
30634 | + unsigned long si_xino_expire; | |
1facf9fc | 30635 | + /* reserved for future use */ |
30636 | + /* unsigned long long si_xib_limit; */ /* Max xib file size */ | |
30637 | + | |
30638 | +#ifdef CONFIG_AUFS_EXPORT | |
30639 | + /* i_generation */ | |
acd2b654 | 30640 | + /* todo: make xigen file an array to support many inode numbers */ |
1facf9fc | 30641 | + struct file *si_xigen; |
30642 | + atomic_t si_xigen_next; | |
30643 | +#endif | |
30644 | + | |
acd2b654 | 30645 | + /* dirty trick to support atomic_open */ |
8b6a4947 | 30646 | + struct hlist_bl_head si_aopen; |
b912730e | 30647 | + |
1facf9fc | 30648 | + /* vdir parameters */ |
e49829fe | 30649 | + unsigned long si_rdcache; /* max cache time in jiffies */ |
1facf9fc | 30650 | + unsigned int si_rdblk; /* deblk size */ |
30651 | + unsigned int si_rdhash; /* hash size */ | |
30652 | + | |
30653 | + /* | |
30654 | + * If the number of whiteouts are larger than si_dirwh, leave all of | |
30655 | + * them after au_whtmp_ren to reduce the cost of rmdir(2). | |
30656 | + * future fsck.aufs or kernel thread will remove them later. | |
30657 | + * Otherwise, remove all whiteouts and the dir in rmdir(2). | |
30658 | + */ | |
30659 | + unsigned int si_dirwh; | |
30660 | + | |
1facf9fc | 30661 | + /* pseudo_link list */ |
8b6a4947 | 30662 | + struct hlist_bl_head si_plink[AuPlink_NHASH]; |
1facf9fc | 30663 | + wait_queue_head_t si_plink_wq; |
4a4d8108 | 30664 | + spinlock_t si_plink_maint_lock; |
e49829fe | 30665 | + pid_t si_plink_maint_pid; |
1facf9fc | 30666 | + |
523b37e3 | 30667 | + /* file list */ |
8b6a4947 | 30668 | + struct hlist_bl_head si_files; |
523b37e3 | 30669 | + |
b95c5147 | 30670 | + /* with/without getattr, brother of sb->s_d_op */ |
43982f53 | 30671 | + const struct inode_operations *si_iop_array; |
b95c5147 | 30672 | + |
1facf9fc | 30673 | + /* |
30674 | + * sysfs and lifetime management. | |
30675 | + * this is not a small structure and it may be a waste of memory in case | |
acd2b654 | 30676 | + * of sysfs is disabled, particularly when many aufs-es are mounted. |
1facf9fc | 30677 | + * but using sysfs is majority. |
30678 | + */ | |
30679 | + struct kobject si_kobj; | |
30680 | +#ifdef CONFIG_DEBUG_FS | |
86dc4139 AM |
30681 | + struct dentry *si_dbgaufs; |
30682 | + struct dentry *si_dbgaufs_plink; | |
30683 | + struct dentry *si_dbgaufs_xib; | |
1facf9fc | 30684 | +#ifdef CONFIG_AUFS_EXPORT |
30685 | + struct dentry *si_dbgaufs_xigen; | |
30686 | +#endif | |
30687 | +#endif | |
30688 | + | |
e49829fe | 30689 | +#ifdef CONFIG_AUFS_SBILIST |
8b6a4947 | 30690 | + struct hlist_bl_node si_list; |
e49829fe JR |
30691 | +#endif |
30692 | + | |
1facf9fc | 30693 | + /* dirty, necessary for unmounting, sysfs and sysrq */ |
30694 | + struct super_block *si_sb; | |
30695 | +}; | |
30696 | + | |
dece6358 AM |
30697 | +/* sbinfo status flags */ |
30698 | +/* | |
30699 | + * set true when refresh_dirs() failed at remount time. | |
30700 | + * then try refreshing dirs at access time again. | |
062440b3 | 30701 | + * if it is false, refreshing dirs at access time is unnecessary |
dece6358 | 30702 | + */ |
027c5e7a | 30703 | +#define AuSi_FAILED_REFRESH_DIR 1 |
076b876e | 30704 | +#define AuSi_FHSM (1 << 1) /* fhsm is active now */ |
79b8bda9 | 30705 | +#define AuSi_NO_DREVAL (1 << 2) /* disable all d_revalidate */ |
076b876e AM |
30706 | + |
30707 | +#ifndef CONFIG_AUFS_FHSM | |
30708 | +#undef AuSi_FHSM | |
30709 | +#define AuSi_FHSM 0 | |
30710 | +#endif | |
30711 | + | |
dece6358 AM |
30712 | +static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi, |
30713 | + unsigned int flag) | |
30714 | +{ | |
30715 | + AuRwMustAnyLock(&sbi->si_rwsem); | |
30716 | + return sbi->au_si_status & flag; | |
30717 | +} | |
30718 | +#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name) | |
30719 | +#define au_fset_si(sbinfo, name) do { \ | |
30720 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
30721 | + (sbinfo)->au_si_status |= AuSi_##name; \ | |
30722 | +} while (0) | |
30723 | +#define au_fclr_si(sbinfo, name) do { \ | |
30724 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
30725 | + (sbinfo)->au_si_status &= ~AuSi_##name; \ | |
30726 | +} while (0) | |
30727 | + | |
1facf9fc | 30728 | +/* ---------------------------------------------------------------------- */ |
30729 | + | |
30730 | +/* policy to select one among writable branches */ | |
4a4d8108 AM |
30731 | +#define AuWbrCopyup(sbinfo, ...) \ |
30732 | + ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__)) | |
30733 | +#define AuWbrCreate(sbinfo, ...) \ | |
30734 | + ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__)) | |
1facf9fc | 30735 | + |
30736 | +/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */ | |
30737 | +#define AuLock_DW 1 /* write-lock dentry */ | |
30738 | +#define AuLock_IR (1 << 1) /* read-lock inode */ | |
30739 | +#define AuLock_IW (1 << 2) /* write-lock inode */ | |
30740 | +#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */ | |
b95c5147 | 30741 | +#define AuLock_DIRS (1 << 4) /* target is a pair of dirs */ |
f2c43d5f | 30742 | + /* except RENAME_EXCHANGE */ |
e49829fe JR |
30743 | +#define AuLock_NOPLM (1 << 5) /* return err in plm mode */ |
30744 | +#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */ | |
027c5e7a | 30745 | +#define AuLock_GEN (1 << 7) /* test digen/iigen */ |
1facf9fc | 30746 | +#define au_ftest_lock(flags, name) ((flags) & AuLock_##name) |
7f207e10 AM |
30747 | +#define au_fset_lock(flags, name) \ |
30748 | + do { (flags) |= AuLock_##name; } while (0) | |
30749 | +#define au_fclr_lock(flags, name) \ | |
30750 | + do { (flags) &= ~AuLock_##name; } while (0) | |
1facf9fc | 30751 | + |
30752 | +/* ---------------------------------------------------------------------- */ | |
30753 | + | |
30754 | +/* super.c */ | |
30755 | +extern struct file_system_type aufs_fs_type; | |
30756 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino); | |
79b8bda9 AM |
30757 | +typedef unsigned long long (*au_arraycb_t)(struct super_block *sb, void *array, |
30758 | + unsigned long long max, void *arg); | |
79b8bda9 AM |
30759 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, |
30760 | + struct super_block *sb, void *arg); | |
7f207e10 AM |
30761 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max); |
30762 | +void au_iarray_free(struct inode **a, unsigned long long max); | |
1facf9fc | 30763 | + |
30764 | +/* sbinfo.c */ | |
30765 | +void au_si_free(struct kobject *kobj); | |
30766 | +int au_si_alloc(struct super_block *sb); | |
e2f27e51 | 30767 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink); |
1facf9fc | 30768 | + |
30769 | +unsigned int au_sigen_inc(struct super_block *sb); | |
30770 | +aufs_bindex_t au_new_br_id(struct super_block *sb); | |
30771 | + | |
e49829fe JR |
30772 | +int si_read_lock(struct super_block *sb, int flags); |
30773 | +int si_write_lock(struct super_block *sb, int flags); | |
30774 | +int aufs_read_lock(struct dentry *dentry, int flags); | |
1facf9fc | 30775 | +void aufs_read_unlock(struct dentry *dentry, int flags); |
30776 | +void aufs_write_lock(struct dentry *dentry); | |
30777 | +void aufs_write_unlock(struct dentry *dentry); | |
e49829fe | 30778 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags); |
1facf9fc | 30779 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2); |
30780 | + | |
30781 | +/* wbr_policy.c */ | |
30782 | +extern struct au_wbr_copyup_operations au_wbr_copyup_ops[]; | |
30783 | +extern struct au_wbr_create_operations au_wbr_create_ops[]; | |
30784 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
c2b27bf2 | 30785 | +int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex); |
5afbbe0d | 30786 | +int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop); |
c2b27bf2 AM |
30787 | + |
30788 | +/* mvdown.c */ | |
30789 | +int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg); | |
1facf9fc | 30790 | + |
076b876e AM |
30791 | +#ifdef CONFIG_AUFS_FHSM |
30792 | +/* fhsm.c */ | |
30793 | + | |
30794 | +static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm) | |
30795 | +{ | |
30796 | + pid_t pid; | |
30797 | + | |
30798 | + spin_lock(&fhsm->fhsm_spin); | |
30799 | + pid = fhsm->fhsm_pid; | |
30800 | + spin_unlock(&fhsm->fhsm_spin); | |
30801 | + | |
30802 | + return pid; | |
30803 | +} | |
30804 | + | |
30805 | +void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force); | |
30806 | +void au_fhsm_wrote_all(struct super_block *sb, int force); | |
30807 | +int au_fhsm_fd(struct super_block *sb, int oflags); | |
30808 | +int au_fhsm_br_alloc(struct au_branch *br); | |
c1595e42 | 30809 | +void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex); |
076b876e AM |
30810 | +void au_fhsm_fin(struct super_block *sb); |
30811 | +void au_fhsm_init(struct au_sbinfo *sbinfo); | |
30812 | +void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec); | |
30813 | +void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo); | |
30814 | +#else | |
30815 | +AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex, | |
30816 | + int force) | |
30817 | +AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force) | |
30818 | +AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags) | |
c1595e42 JR |
30819 | +AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm) |
30820 | +AuStubInt0(au_fhsm_br_alloc, struct au_branch *br) | |
30821 | +AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex) | |
076b876e AM |
30822 | +AuStubVoid(au_fhsm_fin, struct super_block *sb) |
30823 | +AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo) | |
30824 | +AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec) | |
30825 | +AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo) | |
30826 | +#endif | |
30827 | + | |
1facf9fc | 30828 | +/* ---------------------------------------------------------------------- */ |
30829 | + | |
30830 | +static inline struct au_sbinfo *au_sbi(struct super_block *sb) | |
30831 | +{ | |
30832 | + return sb->s_fs_info; | |
30833 | +} | |
30834 | + | |
30835 | +/* ---------------------------------------------------------------------- */ | |
30836 | + | |
30837 | +#ifdef CONFIG_AUFS_EXPORT | |
a2a7ad62 | 30838 | +int au_test_nfsd(void); |
1facf9fc | 30839 | +void au_export_init(struct super_block *sb); |
b752ccd1 | 30840 | +void au_xigen_inc(struct inode *inode); |
1facf9fc | 30841 | +int au_xigen_new(struct inode *inode); |
062440b3 | 30842 | +int au_xigen_set(struct super_block *sb, struct path *path); |
1facf9fc | 30843 | +void au_xigen_clr(struct super_block *sb); |
30844 | + | |
30845 | +static inline int au_busy_or_stale(void) | |
30846 | +{ | |
b752ccd1 | 30847 | + if (!au_test_nfsd()) |
1facf9fc | 30848 | + return -EBUSY; |
30849 | + return -ESTALE; | |
30850 | +} | |
30851 | +#else | |
b752ccd1 | 30852 | +AuStubInt0(au_test_nfsd, void) |
a2a7ad62 | 30853 | +AuStubVoid(au_export_init, struct super_block *sb) |
b752ccd1 | 30854 | +AuStubVoid(au_xigen_inc, struct inode *inode) |
4a4d8108 | 30855 | +AuStubInt0(au_xigen_new, struct inode *inode) |
062440b3 | 30856 | +AuStubInt0(au_xigen_set, struct super_block *sb, struct path *path) |
4a4d8108 | 30857 | +AuStubVoid(au_xigen_clr, struct super_block *sb) |
c1595e42 | 30858 | +AuStub(int, au_busy_or_stale, return -EBUSY, void) |
1facf9fc | 30859 | +#endif /* CONFIG_AUFS_EXPORT */ |
30860 | + | |
30861 | +/* ---------------------------------------------------------------------- */ | |
30862 | + | |
e49829fe JR |
30863 | +#ifdef CONFIG_AUFS_SBILIST |
30864 | +/* module.c */ | |
8b6a4947 | 30865 | +extern struct hlist_bl_head au_sbilist; |
e49829fe JR |
30866 | + |
30867 | +static inline void au_sbilist_init(void) | |
30868 | +{ | |
8b6a4947 | 30869 | + INIT_HLIST_BL_HEAD(&au_sbilist); |
e49829fe JR |
30870 | +} |
30871 | + | |
30872 | +static inline void au_sbilist_add(struct super_block *sb) | |
30873 | +{ | |
8b6a4947 | 30874 | + au_hbl_add(&au_sbi(sb)->si_list, &au_sbilist); |
e49829fe JR |
30875 | +} |
30876 | + | |
30877 | +static inline void au_sbilist_del(struct super_block *sb) | |
30878 | +{ | |
8b6a4947 | 30879 | + au_hbl_del(&au_sbi(sb)->si_list, &au_sbilist); |
e49829fe | 30880 | +} |
53392da6 AM |
30881 | + |
30882 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
30883 | +static inline void au_sbilist_lock(void) | |
30884 | +{ | |
8b6a4947 | 30885 | + hlist_bl_lock(&au_sbilist); |
53392da6 AM |
30886 | +} |
30887 | + | |
30888 | +static inline void au_sbilist_unlock(void) | |
30889 | +{ | |
8b6a4947 | 30890 | + hlist_bl_unlock(&au_sbilist); |
53392da6 AM |
30891 | +} |
30892 | +#define AuGFP_SBILIST GFP_ATOMIC | |
30893 | +#else | |
30894 | +AuStubVoid(au_sbilist_lock, void) | |
30895 | +AuStubVoid(au_sbilist_unlock, void) | |
30896 | +#define AuGFP_SBILIST GFP_NOFS | |
30897 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ | |
e49829fe JR |
30898 | +#else |
30899 | +AuStubVoid(au_sbilist_init, void) | |
c1595e42 JR |
30900 | +AuStubVoid(au_sbilist_add, struct super_block *sb) |
30901 | +AuStubVoid(au_sbilist_del, struct super_block *sb) | |
53392da6 AM |
30902 | +AuStubVoid(au_sbilist_lock, void) |
30903 | +AuStubVoid(au_sbilist_unlock, void) | |
30904 | +#define AuGFP_SBILIST GFP_NOFS | |
e49829fe JR |
30905 | +#endif |
30906 | + | |
30907 | +/* ---------------------------------------------------------------------- */ | |
30908 | + | |
1facf9fc | 30909 | +static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo) |
30910 | +{ | |
dece6358 | 30911 | + /* |
c1595e42 | 30912 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
30913 | + * so the tiny check for si_rwsem is unnecessary. |
30914 | + */ | |
30915 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
1facf9fc | 30916 | +#ifdef CONFIG_DEBUG_FS |
30917 | + sbinfo->si_dbgaufs = NULL; | |
86dc4139 | 30918 | + sbinfo->si_dbgaufs_plink = NULL; |
1facf9fc | 30919 | + sbinfo->si_dbgaufs_xib = NULL; |
30920 | +#ifdef CONFIG_AUFS_EXPORT | |
30921 | + sbinfo->si_dbgaufs_xigen = NULL; | |
30922 | +#endif | |
30923 | +#endif | |
30924 | +} | |
30925 | + | |
30926 | +/* ---------------------------------------------------------------------- */ | |
30927 | + | |
a2654f78 AM |
30928 | +/* current->atomic_flags */ |
30929 | +/* this value should never corrupt the ones defined in linux/sched.h */ | |
fbc438ed | 30930 | +#define PFA_AUFS 0x10 |
a2654f78 AM |
30931 | + |
30932 | +TASK_PFA_TEST(AUFS, test_aufs) /* task_test_aufs */ | |
30933 | +TASK_PFA_SET(AUFS, aufs) /* task_set_aufs */ | |
30934 | +TASK_PFA_CLEAR(AUFS, aufs) /* task_clear_aufs */ | |
b752ccd1 AM |
30935 | + |
30936 | +static inline int si_pid_test(struct super_block *sb) | |
30937 | +{ | |
a2654f78 | 30938 | + return !!task_test_aufs(current); |
b752ccd1 AM |
30939 | +} |
30940 | + | |
30941 | +static inline void si_pid_clr(struct super_block *sb) | |
30942 | +{ | |
a2654f78 AM |
30943 | + AuDebugOn(!task_test_aufs(current)); |
30944 | + task_clear_aufs(current); | |
b752ccd1 AM |
30945 | +} |
30946 | + | |
a2654f78 AM |
30947 | +static inline void si_pid_set(struct super_block *sb) |
30948 | +{ | |
30949 | + AuDebugOn(task_test_aufs(current)); | |
30950 | + task_set_aufs(current); | |
30951 | +} | |
febd17d6 | 30952 | + |
b752ccd1 AM |
30953 | +/* ---------------------------------------------------------------------- */ |
30954 | + | |
1facf9fc | 30955 | +/* lock superblock. mainly for entry point functions */ |
8b6a4947 AM |
30956 | +#define __si_read_lock(sb) au_rw_read_lock(&au_sbi(sb)->si_rwsem) |
30957 | +#define __si_write_lock(sb) au_rw_write_lock(&au_sbi(sb)->si_rwsem) | |
30958 | +#define __si_read_trylock(sb) au_rw_read_trylock(&au_sbi(sb)->si_rwsem) | |
30959 | +#define __si_write_trylock(sb) au_rw_write_trylock(&au_sbi(sb)->si_rwsem) | |
30960 | +/* | |
30961 | +#define __si_read_trylock_nested(sb) \ | |
30962 | + au_rw_read_trylock_nested(&au_sbi(sb)->si_rwsem) | |
30963 | +#define __si_write_trylock_nested(sb) \ | |
30964 | + au_rw_write_trylock_nested(&au_sbi(sb)->si_rwsem) | |
30965 | +*/ | |
30966 | + | |
30967 | +#define __si_read_unlock(sb) au_rw_read_unlock(&au_sbi(sb)->si_rwsem) | |
30968 | +#define __si_write_unlock(sb) au_rw_write_unlock(&au_sbi(sb)->si_rwsem) | |
30969 | +#define __si_downgrade_lock(sb) au_rw_dgrade_lock(&au_sbi(sb)->si_rwsem) | |
1facf9fc | 30970 | + |
dece6358 AM |
30971 | +#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem) |
30972 | +#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem) | |
30973 | +#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem) | |
30974 | + | |
b752ccd1 AM |
30975 | +static inline void si_noflush_read_lock(struct super_block *sb) |
30976 | +{ | |
30977 | + __si_read_lock(sb); | |
30978 | + si_pid_set(sb); | |
30979 | +} | |
30980 | + | |
30981 | +static inline int si_noflush_read_trylock(struct super_block *sb) | |
30982 | +{ | |
076b876e AM |
30983 | + int locked; |
30984 | + | |
30985 | + locked = __si_read_trylock(sb); | |
b752ccd1 AM |
30986 | + if (locked) |
30987 | + si_pid_set(sb); | |
30988 | + return locked; | |
30989 | +} | |
30990 | + | |
30991 | +static inline void si_noflush_write_lock(struct super_block *sb) | |
30992 | +{ | |
30993 | + __si_write_lock(sb); | |
30994 | + si_pid_set(sb); | |
30995 | +} | |
30996 | + | |
30997 | +static inline int si_noflush_write_trylock(struct super_block *sb) | |
30998 | +{ | |
076b876e AM |
30999 | + int locked; |
31000 | + | |
31001 | + locked = __si_write_trylock(sb); | |
b752ccd1 AM |
31002 | + if (locked) |
31003 | + si_pid_set(sb); | |
31004 | + return locked; | |
31005 | +} | |
31006 | + | |
7e9cd9fe | 31007 | +#if 0 /* reserved */ |
1facf9fc | 31008 | +static inline int si_read_trylock(struct super_block *sb, int flags) |
31009 | +{ | |
31010 | + if (au_ftest_lock(flags, FLUSH)) | |
31011 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
31012 | + return si_noflush_read_trylock(sb); | |
31013 | +} | |
e49829fe | 31014 | +#endif |
1facf9fc | 31015 | + |
b752ccd1 AM |
31016 | +static inline void si_read_unlock(struct super_block *sb) |
31017 | +{ | |
31018 | + si_pid_clr(sb); | |
31019 | + __si_read_unlock(sb); | |
31020 | +} | |
31021 | + | |
7e9cd9fe | 31022 | +#if 0 /* reserved */ |
1facf9fc | 31023 | +static inline int si_write_trylock(struct super_block *sb, int flags) |
31024 | +{ | |
31025 | + if (au_ftest_lock(flags, FLUSH)) | |
31026 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
31027 | + return si_noflush_write_trylock(sb); | |
31028 | +} | |
b752ccd1 AM |
31029 | +#endif |
31030 | + | |
31031 | +static inline void si_write_unlock(struct super_block *sb) | |
31032 | +{ | |
31033 | + si_pid_clr(sb); | |
31034 | + __si_write_unlock(sb); | |
31035 | +} | |
31036 | + | |
7e9cd9fe | 31037 | +#if 0 /* reserved */ |
b752ccd1 AM |
31038 | +static inline void si_downgrade_lock(struct super_block *sb) |
31039 | +{ | |
31040 | + __si_downgrade_lock(sb); | |
31041 | +} | |
31042 | +#endif | |
1facf9fc | 31043 | + |
31044 | +/* ---------------------------------------------------------------------- */ | |
31045 | + | |
5afbbe0d | 31046 | +static inline aufs_bindex_t au_sbbot(struct super_block *sb) |
1facf9fc | 31047 | +{ |
dece6358 | 31048 | + SiMustAnyLock(sb); |
5afbbe0d | 31049 | + return au_sbi(sb)->si_bbot; |
1facf9fc | 31050 | +} |
31051 | + | |
31052 | +static inline unsigned int au_mntflags(struct super_block *sb) | |
31053 | +{ | |
dece6358 | 31054 | + SiMustAnyLock(sb); |
1facf9fc | 31055 | + return au_sbi(sb)->si_mntflags; |
31056 | +} | |
31057 | + | |
31058 | +static inline unsigned int au_sigen(struct super_block *sb) | |
31059 | +{ | |
dece6358 | 31060 | + SiMustAnyLock(sb); |
1facf9fc | 31061 | + return au_sbi(sb)->si_generation; |
31062 | +} | |
31063 | + | |
31064 | +static inline struct au_branch *au_sbr(struct super_block *sb, | |
31065 | + aufs_bindex_t bindex) | |
31066 | +{ | |
dece6358 | 31067 | + SiMustAnyLock(sb); |
1facf9fc | 31068 | + return au_sbi(sb)->si_branch[0 + bindex]; |
31069 | +} | |
31070 | + | |
acd2b654 | 31071 | +static inline loff_t au_xi_maxent(struct super_block *sb) |
1facf9fc | 31072 | +{ |
dece6358 | 31073 | + SiMustAnyLock(sb); |
acd2b654 | 31074 | + return au_sbi(sb)->si_ximaxent; |
1facf9fc | 31075 | +} |
31076 | + | |
31077 | +#endif /* __KERNEL__ */ | |
31078 | +#endif /* __AUFS_SUPER_H__ */ | |
7f207e10 | 31079 | diff -urN /usr/share/empty/fs/aufs/sysaufs.c linux/fs/aufs/sysaufs.c |
eca34b5c | 31080 | --- /usr/share/empty/fs/aufs/sysaufs.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 31081 | +++ linux/fs/aufs/sysaufs.c 2020-01-27 10:57:18.178871751 +0100 |
062440b3 | 31082 | @@ -0,0 +1,93 @@ |
cd7a4cd9 | 31083 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31084 | +/* |
016522bc | 31085 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 31086 | + * |
31087 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31088 | + * it under the terms of the GNU General Public License as published by | |
31089 | + * the Free Software Foundation; either version 2 of the License, or | |
31090 | + * (at your option) any later version. | |
dece6358 AM |
31091 | + * |
31092 | + * This program is distributed in the hope that it will be useful, | |
31093 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31094 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31095 | + * GNU General Public License for more details. | |
31096 | + * | |
31097 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31098 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31099 | + */ |
31100 | + | |
31101 | +/* | |
31102 | + * sysfs interface and lifetime management | |
31103 | + * they are necessary regardless sysfs is disabled. | |
31104 | + */ | |
31105 | + | |
1facf9fc | 31106 | +#include <linux/random.h> |
1facf9fc | 31107 | +#include "aufs.h" |
31108 | + | |
31109 | +unsigned long sysaufs_si_mask; | |
e49829fe | 31110 | +struct kset *sysaufs_kset; |
1facf9fc | 31111 | + |
31112 | +#define AuSiAttr(_name) { \ | |
31113 | + .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
31114 | + .show = sysaufs_si_##_name, \ | |
31115 | +} | |
31116 | + | |
31117 | +static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); | |
31118 | +struct attribute *sysaufs_si_attrs[] = { | |
31119 | + &sysaufs_si_attr_xi_path.attr, | |
31120 | + NULL, | |
31121 | +}; | |
31122 | + | |
4a4d8108 | 31123 | +static const struct sysfs_ops au_sbi_ops = { |
1facf9fc | 31124 | + .show = sysaufs_si_show |
31125 | +}; | |
31126 | + | |
31127 | +static struct kobj_type au_sbi_ktype = { | |
31128 | + .release = au_si_free, | |
31129 | + .sysfs_ops = &au_sbi_ops, | |
31130 | + .default_attrs = sysaufs_si_attrs | |
31131 | +}; | |
31132 | + | |
31133 | +/* ---------------------------------------------------------------------- */ | |
31134 | + | |
31135 | +int sysaufs_si_init(struct au_sbinfo *sbinfo) | |
31136 | +{ | |
31137 | + int err; | |
31138 | + | |
e49829fe | 31139 | + sbinfo->si_kobj.kset = sysaufs_kset; |
1facf9fc | 31140 | + /* cf. sysaufs_name() */ |
31141 | + err = kobject_init_and_add | |
e49829fe | 31142 | + (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL, |
1facf9fc | 31143 | + SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); |
31144 | + | |
1facf9fc | 31145 | + return err; |
31146 | +} | |
31147 | + | |
31148 | +void sysaufs_fin(void) | |
31149 | +{ | |
e49829fe JR |
31150 | + sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
31151 | + kset_unregister(sysaufs_kset); | |
1facf9fc | 31152 | +} |
31153 | + | |
31154 | +int __init sysaufs_init(void) | |
31155 | +{ | |
31156 | + int err; | |
31157 | + | |
31158 | + do { | |
31159 | + get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); | |
31160 | + } while (!sysaufs_si_mask); | |
31161 | + | |
4a4d8108 | 31162 | + err = -EINVAL; |
e49829fe JR |
31163 | + sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); |
31164 | + if (unlikely(!sysaufs_kset)) | |
4a4d8108 | 31165 | + goto out; |
e49829fe JR |
31166 | + err = PTR_ERR(sysaufs_kset); |
31167 | + if (IS_ERR(sysaufs_kset)) | |
1facf9fc | 31168 | + goto out; |
e49829fe | 31169 | + err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
062440b3 | 31170 | + if (unlikely(err)) |
e49829fe | 31171 | + kset_unregister(sysaufs_kset); |
1facf9fc | 31172 | + |
4f0767ce | 31173 | +out: |
1facf9fc | 31174 | + return err; |
31175 | +} | |
7f207e10 | 31176 | diff -urN /usr/share/empty/fs/aufs/sysaufs.h linux/fs/aufs/sysaufs.h |
eca34b5c | 31177 | --- /usr/share/empty/fs/aufs/sysaufs.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 31178 | +++ linux/fs/aufs/sysaufs.h 2020-01-27 10:57:18.178871751 +0100 |
062440b3 AM |
31179 | @@ -0,0 +1,102 @@ |
31180 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 31181 | +/* |
016522bc | 31182 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 31183 | + * |
31184 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31185 | + * it under the terms of the GNU General Public License as published by | |
31186 | + * the Free Software Foundation; either version 2 of the License, or | |
31187 | + * (at your option) any later version. | |
dece6358 AM |
31188 | + * |
31189 | + * This program is distributed in the hope that it will be useful, | |
31190 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31191 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31192 | + * GNU General Public License for more details. | |
31193 | + * | |
31194 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31195 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31196 | + */ |
31197 | + | |
31198 | +/* | |
31199 | + * sysfs interface and mount lifetime management | |
31200 | + */ | |
31201 | + | |
31202 | +#ifndef __SYSAUFS_H__ | |
31203 | +#define __SYSAUFS_H__ | |
31204 | + | |
31205 | +#ifdef __KERNEL__ | |
31206 | + | |
1facf9fc | 31207 | +#include <linux/sysfs.h> |
1facf9fc | 31208 | +#include "module.h" |
31209 | + | |
dece6358 AM |
31210 | +struct super_block; |
31211 | +struct au_sbinfo; | |
31212 | + | |
1facf9fc | 31213 | +struct sysaufs_si_attr { |
31214 | + struct attribute attr; | |
31215 | + int (*show)(struct seq_file *seq, struct super_block *sb); | |
31216 | +}; | |
31217 | + | |
31218 | +/* ---------------------------------------------------------------------- */ | |
31219 | + | |
31220 | +/* sysaufs.c */ | |
31221 | +extern unsigned long sysaufs_si_mask; | |
e49829fe | 31222 | +extern struct kset *sysaufs_kset; |
1facf9fc | 31223 | +extern struct attribute *sysaufs_si_attrs[]; |
31224 | +int sysaufs_si_init(struct au_sbinfo *sbinfo); | |
31225 | +int __init sysaufs_init(void); | |
31226 | +void sysaufs_fin(void); | |
31227 | + | |
31228 | +/* ---------------------------------------------------------------------- */ | |
31229 | + | |
31230 | +/* some people doesn't like to show a pointer in kernel */ | |
31231 | +static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) | |
31232 | +{ | |
31233 | + return sysaufs_si_mask ^ (unsigned long)sbinfo; | |
31234 | +} | |
31235 | + | |
31236 | +#define SysaufsSiNamePrefix "si_" | |
31237 | +#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) | |
31238 | +static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) | |
31239 | +{ | |
31240 | + snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", | |
31241 | + sysaufs_si_id(sbinfo)); | |
31242 | +} | |
31243 | + | |
31244 | +struct au_branch; | |
31245 | +#ifdef CONFIG_SYSFS | |
31246 | +/* sysfs.c */ | |
31247 | +extern struct attribute_group *sysaufs_attr_group; | |
31248 | + | |
31249 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); | |
31250 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
31251 | + char *buf); | |
076b876e AM |
31252 | +long au_brinfo_ioctl(struct file *file, unsigned long arg); |
31253 | +#ifdef CONFIG_COMPAT | |
31254 | +long au_brinfo_compat_ioctl(struct file *file, unsigned long arg); | |
31255 | +#endif | |
1facf9fc | 31256 | + |
31257 | +void sysaufs_br_init(struct au_branch *br); | |
31258 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
31259 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
31260 | + | |
31261 | +#define sysaufs_brs_init() do {} while (0) | |
31262 | + | |
31263 | +#else | |
31264 | +#define sysaufs_attr_group NULL | |
31265 | + | |
4a4d8108 | 31266 | +AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) |
c1595e42 JR |
31267 | +AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj, |
31268 | + struct attribute *attr, char *buf) | |
4a4d8108 AM |
31269 | +AuStubVoid(sysaufs_br_init, struct au_branch *br) |
31270 | +AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
31271 | +AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) | |
1facf9fc | 31272 | + |
31273 | +static inline void sysaufs_brs_init(void) | |
31274 | +{ | |
31275 | + sysaufs_brs = 0; | |
31276 | +} | |
31277 | + | |
31278 | +#endif /* CONFIG_SYSFS */ | |
31279 | + | |
31280 | +#endif /* __KERNEL__ */ | |
31281 | +#endif /* __SYSAUFS_H__ */ | |
7f207e10 | 31282 | diff -urN /usr/share/empty/fs/aufs/sysfs.c linux/fs/aufs/sysfs.c |
eca34b5c | 31283 | --- /usr/share/empty/fs/aufs/sysfs.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 31284 | +++ linux/fs/aufs/sysfs.c 2020-01-27 10:57:18.178871751 +0100 |
ba1aed25 | 31285 | @@ -0,0 +1,374 @@ |
cd7a4cd9 | 31286 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31287 | +/* |
016522bc | 31288 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 31289 | + * |
31290 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31291 | + * it under the terms of the GNU General Public License as published by | |
31292 | + * the Free Software Foundation; either version 2 of the License, or | |
31293 | + * (at your option) any later version. | |
dece6358 AM |
31294 | + * |
31295 | + * This program is distributed in the hope that it will be useful, | |
31296 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31297 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31298 | + * GNU General Public License for more details. | |
31299 | + * | |
31300 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31301 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31302 | + */ |
31303 | + | |
31304 | +/* | |
31305 | + * sysfs interface | |
31306 | + */ | |
31307 | + | |
076b876e | 31308 | +#include <linux/compat.h> |
1facf9fc | 31309 | +#include <linux/seq_file.h> |
1facf9fc | 31310 | +#include "aufs.h" |
31311 | + | |
4a4d8108 AM |
31312 | +#ifdef CONFIG_AUFS_FS_MODULE |
31313 | +/* this entry violates the "one line per file" policy of sysfs */ | |
31314 | +static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, | |
31315 | + char *buf) | |
31316 | +{ | |
31317 | + ssize_t err; | |
31318 | + static char *conf = | |
31319 | +/* this file is generated at compiling */ | |
31320 | +#include "conf.str" | |
31321 | + ; | |
31322 | + | |
31323 | + err = snprintf(buf, PAGE_SIZE, conf); | |
31324 | + if (unlikely(err >= PAGE_SIZE)) | |
31325 | + err = -EFBIG; | |
31326 | + return err; | |
31327 | +} | |
31328 | + | |
31329 | +static struct kobj_attribute au_config_attr = __ATTR_RO(config); | |
31330 | +#endif | |
31331 | + | |
1facf9fc | 31332 | +static struct attribute *au_attr[] = { |
4a4d8108 AM |
31333 | +#ifdef CONFIG_AUFS_FS_MODULE |
31334 | + &au_config_attr.attr, | |
31335 | +#endif | |
1facf9fc | 31336 | + NULL, /* need to NULL terminate the list of attributes */ |
31337 | +}; | |
31338 | + | |
31339 | +static struct attribute_group sysaufs_attr_group_body = { | |
31340 | + .attrs = au_attr | |
31341 | +}; | |
31342 | + | |
31343 | +struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body; | |
31344 | + | |
31345 | +/* ---------------------------------------------------------------------- */ | |
31346 | + | |
31347 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb) | |
31348 | +{ | |
31349 | + int err; | |
31350 | + | |
dece6358 AM |
31351 | + SiMustAnyLock(sb); |
31352 | + | |
1facf9fc | 31353 | + err = 0; |
31354 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
31355 | + err = au_xino_path(seq, au_sbi(sb)->si_xib); | |
31356 | + seq_putc(seq, '\n'); | |
31357 | + } | |
31358 | + return err; | |
31359 | +} | |
31360 | + | |
31361 | +/* | |
31362 | + * the lifetime of branch is independent from the entry under sysfs. | |
31363 | + * sysfs handles the lifetime of the entry, and never call ->show() after it is | |
31364 | + * unlinked. | |
31365 | + */ | |
31366 | +static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb, | |
392086de | 31367 | + aufs_bindex_t bindex, int idx) |
1facf9fc | 31368 | +{ |
1e00d052 | 31369 | + int err; |
1facf9fc | 31370 | + struct path path; |
31371 | + struct dentry *root; | |
31372 | + struct au_branch *br; | |
076b876e | 31373 | + au_br_perm_str_t perm; |
1facf9fc | 31374 | + |
31375 | + AuDbg("b%d\n", bindex); | |
31376 | + | |
1e00d052 | 31377 | + err = 0; |
1facf9fc | 31378 | + root = sb->s_root; |
31379 | + di_read_lock_parent(root, !AuLock_IR); | |
31380 | + br = au_sbr(sb, bindex); | |
392086de AM |
31381 | + |
31382 | + switch (idx) { | |
31383 | + case AuBrSysfs_BR: | |
31384 | + path.mnt = au_br_mnt(br); | |
31385 | + path.dentry = au_h_dptr(root, bindex); | |
79b8bda9 AM |
31386 | + err = au_seq_path(seq, &path); |
31387 | + if (!err) { | |
31388 | + au_optstr_br_perm(&perm, br->br_perm); | |
31389 | + seq_printf(seq, "=%s\n", perm.a); | |
31390 | + } | |
392086de AM |
31391 | + break; |
31392 | + case AuBrSysfs_BRID: | |
79b8bda9 | 31393 | + seq_printf(seq, "%d\n", br->br_id); |
392086de AM |
31394 | + break; |
31395 | + } | |
076b876e | 31396 | + di_read_unlock(root, !AuLock_IR); |
79b8bda9 | 31397 | + if (unlikely(err || seq_has_overflowed(seq))) |
076b876e | 31398 | + err = -E2BIG; |
392086de | 31399 | + |
1e00d052 | 31400 | + return err; |
1facf9fc | 31401 | +} |
31402 | + | |
31403 | +/* ---------------------------------------------------------------------- */ | |
31404 | + | |
31405 | +static struct seq_file *au_seq(char *p, ssize_t len) | |
31406 | +{ | |
31407 | + struct seq_file *seq; | |
31408 | + | |
31409 | + seq = kzalloc(sizeof(*seq), GFP_NOFS); | |
31410 | + if (seq) { | |
31411 | + /* mutex_init(&seq.lock); */ | |
31412 | + seq->buf = p; | |
31413 | + seq->size = len; | |
31414 | + return seq; /* success */ | |
31415 | + } | |
31416 | + | |
31417 | + seq = ERR_PTR(-ENOMEM); | |
31418 | + return seq; | |
31419 | +} | |
31420 | + | |
392086de AM |
31421 | +#define SysaufsBr_PREFIX "br" |
31422 | +#define SysaufsBrid_PREFIX "brid" | |
1facf9fc | 31423 | + |
31424 | +/* todo: file size may exceed PAGE_SIZE */ | |
31425 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
1308ab2a | 31426 | + char *buf) |
1facf9fc | 31427 | +{ |
31428 | + ssize_t err; | |
392086de | 31429 | + int idx; |
1facf9fc | 31430 | + long l; |
5afbbe0d | 31431 | + aufs_bindex_t bbot; |
1facf9fc | 31432 | + struct au_sbinfo *sbinfo; |
31433 | + struct super_block *sb; | |
31434 | + struct seq_file *seq; | |
31435 | + char *name; | |
31436 | + struct attribute **cattr; | |
31437 | + | |
31438 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
31439 | + sb = sbinfo->si_sb; | |
1308ab2a | 31440 | + |
31441 | + /* | |
31442 | + * prevent a race condition between sysfs and aufs. | |
31443 | + * for instance, sysfs_file_read() calls sysfs_get_active_two() which | |
31444 | + * prohibits maintaining the sysfs entries. | |
31445 | + * hew we acquire read lock after sysfs_get_active_two(). | |
31446 | + * on the other hand, the remount process may maintain the sysfs/aufs | |
31447 | + * entries after acquiring write lock. | |
31448 | + * it can cause a deadlock. | |
31449 | + * simply we gave up processing read here. | |
31450 | + */ | |
31451 | + err = -EBUSY; | |
31452 | + if (unlikely(!si_noflush_read_trylock(sb))) | |
31453 | + goto out; | |
1facf9fc | 31454 | + |
31455 | + seq = au_seq(buf, PAGE_SIZE); | |
31456 | + err = PTR_ERR(seq); | |
31457 | + if (IS_ERR(seq)) | |
1308ab2a | 31458 | + goto out_unlock; |
1facf9fc | 31459 | + |
31460 | + name = (void *)attr->name; | |
31461 | + cattr = sysaufs_si_attrs; | |
31462 | + while (*cattr) { | |
31463 | + if (!strcmp(name, (*cattr)->name)) { | |
31464 | + err = container_of(*cattr, struct sysaufs_si_attr, attr) | |
31465 | + ->show(seq, sb); | |
31466 | + goto out_seq; | |
31467 | + } | |
31468 | + cattr++; | |
31469 | + } | |
31470 | + | |
392086de AM |
31471 | + if (!strncmp(name, SysaufsBrid_PREFIX, |
31472 | + sizeof(SysaufsBrid_PREFIX) - 1)) { | |
31473 | + idx = AuBrSysfs_BRID; | |
31474 | + name += sizeof(SysaufsBrid_PREFIX) - 1; | |
31475 | + } else if (!strncmp(name, SysaufsBr_PREFIX, | |
31476 | + sizeof(SysaufsBr_PREFIX) - 1)) { | |
31477 | + idx = AuBrSysfs_BR; | |
1facf9fc | 31478 | + name += sizeof(SysaufsBr_PREFIX) - 1; |
392086de AM |
31479 | + } else |
31480 | + BUG(); | |
31481 | + | |
31482 | + err = kstrtol(name, 10, &l); | |
31483 | + if (!err) { | |
5afbbe0d AM |
31484 | + bbot = au_sbbot(sb); |
31485 | + if (l <= bbot) | |
392086de AM |
31486 | + err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx); |
31487 | + else | |
31488 | + err = -ENOENT; | |
1facf9fc | 31489 | + } |
1facf9fc | 31490 | + |
4f0767ce | 31491 | +out_seq: |
1facf9fc | 31492 | + if (!err) { |
31493 | + err = seq->count; | |
31494 | + /* sysfs limit */ | |
31495 | + if (unlikely(err == PAGE_SIZE)) | |
31496 | + err = -EFBIG; | |
31497 | + } | |
9f237c51 | 31498 | + au_kfree_rcu(seq); |
4f0767ce | 31499 | +out_unlock: |
1facf9fc | 31500 | + si_read_unlock(sb); |
4f0767ce | 31501 | +out: |
1facf9fc | 31502 | + return err; |
31503 | +} | |
31504 | + | |
31505 | +/* ---------------------------------------------------------------------- */ | |
31506 | + | |
076b876e AM |
31507 | +static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg) |
31508 | +{ | |
31509 | + int err; | |
31510 | + int16_t brid; | |
5afbbe0d | 31511 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
31512 | + size_t sz; |
31513 | + char *buf; | |
31514 | + struct seq_file *seq; | |
31515 | + struct au_branch *br; | |
31516 | + | |
31517 | + si_read_lock(sb, AuLock_FLUSH); | |
5afbbe0d AM |
31518 | + bbot = au_sbbot(sb); |
31519 | + err = bbot + 1; | |
076b876e AM |
31520 | + if (!arg) |
31521 | + goto out; | |
31522 | + | |
31523 | + err = -ENOMEM; | |
31524 | + buf = (void *)__get_free_page(GFP_NOFS); | |
31525 | + if (unlikely(!buf)) | |
31526 | + goto out; | |
31527 | + | |
31528 | + seq = au_seq(buf, PAGE_SIZE); | |
31529 | + err = PTR_ERR(seq); | |
31530 | + if (IS_ERR(seq)) | |
31531 | + goto out_buf; | |
31532 | + | |
31533 | + sz = sizeof(*arg) - offsetof(union aufs_brinfo, path); | |
5afbbe0d | 31534 | + for (bindex = 0; bindex <= bbot; bindex++, arg++) { |
ba1aed25 AM |
31535 | + /* VERIFY_WRITE */ |
31536 | + err = !access_ok(arg, sizeof(*arg)); | |
076b876e AM |
31537 | + if (unlikely(err)) |
31538 | + break; | |
31539 | + | |
31540 | + br = au_sbr(sb, bindex); | |
31541 | + brid = br->br_id; | |
31542 | + BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id)); | |
31543 | + err = __put_user(brid, &arg->id); | |
31544 | + if (unlikely(err)) | |
31545 | + break; | |
31546 | + | |
31547 | + BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm)); | |
31548 | + err = __put_user(br->br_perm, &arg->perm); | |
31549 | + if (unlikely(err)) | |
31550 | + break; | |
31551 | + | |
79b8bda9 AM |
31552 | + err = au_seq_path(seq, &br->br_path); |
31553 | + if (unlikely(err)) | |
31554 | + break; | |
31555 | + seq_putc(seq, '\0'); | |
31556 | + if (!seq_has_overflowed(seq)) { | |
076b876e AM |
31557 | + err = copy_to_user(arg->path, seq->buf, seq->count); |
31558 | + seq->count = 0; | |
31559 | + if (unlikely(err)) | |
31560 | + break; | |
31561 | + } else { | |
31562 | + err = -E2BIG; | |
31563 | + goto out_seq; | |
31564 | + } | |
31565 | + } | |
31566 | + if (unlikely(err)) | |
31567 | + err = -EFAULT; | |
31568 | + | |
31569 | +out_seq: | |
9f237c51 | 31570 | + au_kfree_rcu(seq); |
076b876e | 31571 | +out_buf: |
1c60b727 | 31572 | + free_page((unsigned long)buf); |
076b876e AM |
31573 | +out: |
31574 | + si_read_unlock(sb); | |
31575 | + return err; | |
31576 | +} | |
31577 | + | |
31578 | +long au_brinfo_ioctl(struct file *file, unsigned long arg) | |
31579 | +{ | |
2000de60 | 31580 | + return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg); |
076b876e AM |
31581 | +} |
31582 | + | |
31583 | +#ifdef CONFIG_COMPAT | |
31584 | +long au_brinfo_compat_ioctl(struct file *file, unsigned long arg) | |
31585 | +{ | |
2000de60 | 31586 | + return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg)); |
076b876e AM |
31587 | +} |
31588 | +#endif | |
31589 | + | |
31590 | +/* ---------------------------------------------------------------------- */ | |
31591 | + | |
1facf9fc | 31592 | +void sysaufs_br_init(struct au_branch *br) |
31593 | +{ | |
392086de AM |
31594 | + int i; |
31595 | + struct au_brsysfs *br_sysfs; | |
31596 | + struct attribute *attr; | |
4a4d8108 | 31597 | + |
392086de AM |
31598 | + br_sysfs = br->br_sysfs; |
31599 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31600 | + attr = &br_sysfs->attr; | |
31601 | + sysfs_attr_init(attr); | |
31602 | + attr->name = br_sysfs->name; | |
cd7a4cd9 | 31603 | + attr->mode = 0444; |
392086de AM |
31604 | + br_sysfs++; |
31605 | + } | |
1facf9fc | 31606 | +} |
31607 | + | |
31608 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
31609 | +{ | |
31610 | + struct au_branch *br; | |
31611 | + struct kobject *kobj; | |
392086de AM |
31612 | + struct au_brsysfs *br_sysfs; |
31613 | + int i; | |
5afbbe0d | 31614 | + aufs_bindex_t bbot; |
1facf9fc | 31615 | + |
1facf9fc | 31616 | + if (!sysaufs_brs) |
31617 | + return; | |
31618 | + | |
31619 | + kobj = &au_sbi(sb)->si_kobj; | |
5afbbe0d AM |
31620 | + bbot = au_sbbot(sb); |
31621 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 31622 | + br = au_sbr(sb, bindex); |
392086de AM |
31623 | + br_sysfs = br->br_sysfs; |
31624 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31625 | + sysfs_remove_file(kobj, &br_sysfs->attr); | |
31626 | + br_sysfs++; | |
31627 | + } | |
1facf9fc | 31628 | + } |
31629 | +} | |
31630 | + | |
31631 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
31632 | +{ | |
392086de | 31633 | + int err, i; |
5afbbe0d | 31634 | + aufs_bindex_t bbot; |
1facf9fc | 31635 | + struct kobject *kobj; |
31636 | + struct au_branch *br; | |
392086de | 31637 | + struct au_brsysfs *br_sysfs; |
1facf9fc | 31638 | + |
1facf9fc | 31639 | + if (!sysaufs_brs) |
31640 | + return; | |
31641 | + | |
31642 | + kobj = &au_sbi(sb)->si_kobj; | |
5afbbe0d AM |
31643 | + bbot = au_sbbot(sb); |
31644 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 31645 | + br = au_sbr(sb, bindex); |
392086de AM |
31646 | + br_sysfs = br->br_sysfs; |
31647 | + snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name), | |
31648 | + SysaufsBr_PREFIX "%d", bindex); | |
31649 | + snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name), | |
31650 | + SysaufsBrid_PREFIX "%d", bindex); | |
31651 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31652 | + err = sysfs_create_file(kobj, &br_sysfs->attr); | |
31653 | + if (unlikely(err)) | |
31654 | + pr_warn("failed %s under sysfs(%d)\n", | |
31655 | + br_sysfs->name, err); | |
31656 | + br_sysfs++; | |
31657 | + } | |
1facf9fc | 31658 | + } |
31659 | +} | |
7f207e10 | 31660 | diff -urN /usr/share/empty/fs/aufs/sysrq.c linux/fs/aufs/sysrq.c |
eca34b5c | 31661 | --- /usr/share/empty/fs/aufs/sysrq.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 31662 | +++ linux/fs/aufs/sysrq.c 2020-01-27 10:57:18.178871751 +0100 |
43982f53 | 31663 | @@ -0,0 +1,149 @@ |
cd7a4cd9 | 31664 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31665 | +/* |
016522bc | 31666 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 31667 | + * |
31668 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31669 | + * it under the terms of the GNU General Public License as published by | |
31670 | + * the Free Software Foundation; either version 2 of the License, or | |
31671 | + * (at your option) any later version. | |
dece6358 AM |
31672 | + * |
31673 | + * This program is distributed in the hope that it will be useful, | |
31674 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31675 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31676 | + * GNU General Public License for more details. | |
31677 | + * | |
31678 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31679 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31680 | + */ |
31681 | + | |
31682 | +/* | |
acd2b654 | 31683 | + * magic sysrq handler |
1facf9fc | 31684 | + */ |
31685 | + | |
1facf9fc | 31686 | +/* #include <linux/sysrq.h> */ |
027c5e7a | 31687 | +#include <linux/writeback.h> |
1facf9fc | 31688 | +#include "aufs.h" |
31689 | + | |
31690 | +/* ---------------------------------------------------------------------- */ | |
31691 | + | |
31692 | +static void sysrq_sb(struct super_block *sb) | |
31693 | +{ | |
31694 | + char *plevel; | |
31695 | + struct au_sbinfo *sbinfo; | |
31696 | + struct file *file; | |
8b6a4947 AM |
31697 | + struct hlist_bl_head *files; |
31698 | + struct hlist_bl_node *pos; | |
523b37e3 | 31699 | + struct au_finfo *finfo; |
43982f53 | 31700 | + struct inode *i; |
1facf9fc | 31701 | + |
31702 | + plevel = au_plevel; | |
31703 | + au_plevel = KERN_WARNING; | |
1facf9fc | 31704 | + |
4a4d8108 | 31705 | + /* since we define pr_fmt, call printk directly */ |
c06a8ce3 AM |
31706 | +#define pr(str) printk(KERN_WARNING AUFS_NAME ": " str) |
31707 | + | |
31708 | + sbinfo = au_sbi(sb); | |
4a4d8108 | 31709 | + printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo)); |
c06a8ce3 | 31710 | + pr("superblock\n"); |
1facf9fc | 31711 | + au_dpri_sb(sb); |
027c5e7a | 31712 | + |
43982f53 | 31713 | +#if 0 /* reserved */ |
027c5e7a AM |
31714 | + do { |
31715 | + int err, i, j, ndentry; | |
31716 | + struct au_dcsub_pages dpages; | |
31717 | + struct au_dpage *dpage; | |
31718 | + | |
31719 | + err = au_dpages_init(&dpages, GFP_ATOMIC); | |
31720 | + if (unlikely(err)) | |
31721 | + break; | |
31722 | + err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL); | |
31723 | + if (!err) | |
31724 | + for (i = 0; i < dpages.ndpage; i++) { | |
31725 | + dpage = dpages.dpages + i; | |
31726 | + ndentry = dpage->ndentry; | |
31727 | + for (j = 0; j < ndentry; j++) | |
31728 | + au_dpri_dentry(dpage->dentries[j]); | |
31729 | + } | |
31730 | + au_dpages_free(&dpages); | |
31731 | + } while (0); | |
31732 | +#endif | |
31733 | + | |
43982f53 AM |
31734 | + pr("isolated inode\n"); |
31735 | + spin_lock(&sb->s_inode_list_lock); | |
31736 | + list_for_each_entry(i, &sb->s_inodes, i_sb_list) { | |
31737 | + spin_lock(&i->i_lock); | |
31738 | + if (hlist_empty(&i->i_dentry)) | |
31739 | + au_dpri_inode(i); | |
31740 | + spin_unlock(&i->i_lock); | |
027c5e7a | 31741 | + } |
43982f53 AM |
31742 | + spin_unlock(&sb->s_inode_list_lock); |
31743 | + | |
c06a8ce3 | 31744 | + pr("files\n"); |
523b37e3 | 31745 | + files = &au_sbi(sb)->si_files; |
8b6a4947 AM |
31746 | + hlist_bl_lock(files); |
31747 | + hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { | |
4a4d8108 | 31748 | + umode_t mode; |
076b876e | 31749 | + |
523b37e3 | 31750 | + file = finfo->fi_file; |
c06a8ce3 | 31751 | + mode = file_inode(file)->i_mode; |
38d290e6 | 31752 | + if (!special_file(mode)) |
1facf9fc | 31753 | + au_dpri_file(file); |
523b37e3 | 31754 | + } |
8b6a4947 | 31755 | + hlist_bl_unlock(files); |
c06a8ce3 | 31756 | + pr("done\n"); |
1facf9fc | 31757 | + |
c06a8ce3 | 31758 | +#undef pr |
1facf9fc | 31759 | + au_plevel = plevel; |
1facf9fc | 31760 | +} |
31761 | + | |
31762 | +/* ---------------------------------------------------------------------- */ | |
31763 | + | |
31764 | +/* module parameter */ | |
31765 | +static char *aufs_sysrq_key = "a"; | |
cd7a4cd9 | 31766 | +module_param_named(sysrq, aufs_sysrq_key, charp, 0444); |
1facf9fc | 31767 | +MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME); |
31768 | + | |
0c5527e5 | 31769 | +static void au_sysrq(int key __maybe_unused) |
1facf9fc | 31770 | +{ |
1facf9fc | 31771 | + struct au_sbinfo *sbinfo; |
8b6a4947 | 31772 | + struct hlist_bl_node *pos; |
1facf9fc | 31773 | + |
027c5e7a | 31774 | + lockdep_off(); |
53392da6 | 31775 | + au_sbilist_lock(); |
8b6a4947 | 31776 | + hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) |
1facf9fc | 31777 | + sysrq_sb(sbinfo->si_sb); |
53392da6 | 31778 | + au_sbilist_unlock(); |
027c5e7a | 31779 | + lockdep_on(); |
1facf9fc | 31780 | +} |
31781 | + | |
31782 | +static struct sysrq_key_op au_sysrq_op = { | |
31783 | + .handler = au_sysrq, | |
31784 | + .help_msg = "Aufs", | |
31785 | + .action_msg = "Aufs", | |
31786 | + .enable_mask = SYSRQ_ENABLE_DUMP | |
31787 | +}; | |
31788 | + | |
31789 | +/* ---------------------------------------------------------------------- */ | |
31790 | + | |
31791 | +int __init au_sysrq_init(void) | |
31792 | +{ | |
31793 | + int err; | |
31794 | + char key; | |
31795 | + | |
31796 | + err = -1; | |
31797 | + key = *aufs_sysrq_key; | |
31798 | + if ('a' <= key && key <= 'z') | |
31799 | + err = register_sysrq_key(key, &au_sysrq_op); | |
31800 | + if (unlikely(err)) | |
4a4d8108 | 31801 | + pr_err("err %d, sysrq=%c\n", err, key); |
1facf9fc | 31802 | + return err; |
31803 | +} | |
31804 | + | |
31805 | +void au_sysrq_fin(void) | |
31806 | +{ | |
31807 | + int err; | |
076b876e | 31808 | + |
1facf9fc | 31809 | + err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op); |
31810 | + if (unlikely(err)) | |
4a4d8108 | 31811 | + pr_err("err %d (ignored)\n", err); |
1facf9fc | 31812 | +} |
7f207e10 | 31813 | diff -urN /usr/share/empty/fs/aufs/vdir.c linux/fs/aufs/vdir.c |
eca34b5c | 31814 | --- /usr/share/empty/fs/aufs/vdir.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 31815 | +++ linux/fs/aufs/vdir.c 2020-01-27 10:57:18.178871751 +0100 |
eca801bf | 31816 | @@ -0,0 +1,896 @@ |
cd7a4cd9 | 31817 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31818 | +/* |
016522bc | 31819 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 31820 | + * |
31821 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31822 | + * it under the terms of the GNU General Public License as published by | |
31823 | + * the Free Software Foundation; either version 2 of the License, or | |
31824 | + * (at your option) any later version. | |
dece6358 AM |
31825 | + * |
31826 | + * This program is distributed in the hope that it will be useful, | |
31827 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31828 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31829 | + * GNU General Public License for more details. | |
31830 | + * | |
31831 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31832 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31833 | + */ |
31834 | + | |
31835 | +/* | |
31836 | + * virtual or vertical directory | |
31837 | + */ | |
31838 | + | |
eca801bf | 31839 | +#include <linux/iversion.h> |
1facf9fc | 31840 | +#include "aufs.h" |
31841 | + | |
dece6358 | 31842 | +static unsigned int calc_size(int nlen) |
1facf9fc | 31843 | +{ |
dece6358 | 31844 | + return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t)); |
1facf9fc | 31845 | +} |
31846 | + | |
31847 | +static int set_deblk_end(union au_vdir_deblk_p *p, | |
31848 | + union au_vdir_deblk_p *deblk_end) | |
31849 | +{ | |
31850 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) { | |
31851 | + p->de->de_str.len = 0; | |
31852 | + /* smp_mb(); */ | |
31853 | + return 0; | |
31854 | + } | |
31855 | + return -1; /* error */ | |
31856 | +} | |
31857 | + | |
31858 | +/* returns true or false */ | |
31859 | +static int is_deblk_end(union au_vdir_deblk_p *p, | |
31860 | + union au_vdir_deblk_p *deblk_end) | |
31861 | +{ | |
31862 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) | |
31863 | + return !p->de->de_str.len; | |
31864 | + return 1; | |
31865 | +} | |
31866 | + | |
31867 | +static unsigned char *last_deblk(struct au_vdir *vdir) | |
31868 | +{ | |
31869 | + return vdir->vd_deblk[vdir->vd_nblk - 1]; | |
31870 | +} | |
31871 | + | |
31872 | +/* ---------------------------------------------------------------------- */ | |
31873 | + | |
79b8bda9 | 31874 | +/* estimate the appropriate size for name hash table */ |
1308ab2a | 31875 | +unsigned int au_rdhash_est(loff_t sz) |
31876 | +{ | |
31877 | + unsigned int n; | |
31878 | + | |
31879 | + n = UINT_MAX; | |
31880 | + sz >>= 10; | |
31881 | + if (sz < n) | |
31882 | + n = sz; | |
31883 | + if (sz < AUFS_RDHASH_DEF) | |
31884 | + n = AUFS_RDHASH_DEF; | |
4a4d8108 | 31885 | + /* pr_info("n %u\n", n); */ |
1308ab2a | 31886 | + return n; |
31887 | +} | |
31888 | + | |
1facf9fc | 31889 | +/* |
31890 | + * the allocated memory has to be freed by | |
dece6358 | 31891 | + * au_nhash_wh_free() or au_nhash_de_free(). |
1facf9fc | 31892 | + */ |
dece6358 | 31893 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp) |
1facf9fc | 31894 | +{ |
1facf9fc | 31895 | + struct hlist_head *head; |
dece6358 | 31896 | + unsigned int u; |
076b876e | 31897 | + size_t sz; |
1facf9fc | 31898 | + |
076b876e AM |
31899 | + sz = sizeof(*nhash->nh_head) * num_hash; |
31900 | + head = kmalloc(sz, gfp); | |
dece6358 AM |
31901 | + if (head) { |
31902 | + nhash->nh_num = num_hash; | |
31903 | + nhash->nh_head = head; | |
31904 | + for (u = 0; u < num_hash; u++) | |
1facf9fc | 31905 | + INIT_HLIST_HEAD(head++); |
dece6358 | 31906 | + return 0; /* success */ |
1facf9fc | 31907 | + } |
1facf9fc | 31908 | + |
dece6358 | 31909 | + return -ENOMEM; |
1facf9fc | 31910 | +} |
31911 | + | |
dece6358 AM |
31912 | +static void nhash_count(struct hlist_head *head) |
31913 | +{ | |
43982f53 | 31914 | +#if 0 /* debugging */ |
dece6358 AM |
31915 | + unsigned long n; |
31916 | + struct hlist_node *pos; | |
31917 | + | |
31918 | + n = 0; | |
31919 | + hlist_for_each(pos, head) | |
31920 | + n++; | |
4a4d8108 | 31921 | + pr_info("%lu\n", n); |
dece6358 AM |
31922 | +#endif |
31923 | +} | |
31924 | + | |
31925 | +static void au_nhash_wh_do_free(struct hlist_head *head) | |
1facf9fc | 31926 | +{ |
c06a8ce3 AM |
31927 | + struct au_vdir_wh *pos; |
31928 | + struct hlist_node *node; | |
1facf9fc | 31929 | + |
c06a8ce3 | 31930 | + hlist_for_each_entry_safe(pos, node, head, wh_hash) |
9f237c51 | 31931 | + au_kfree_rcu(pos); |
1facf9fc | 31932 | +} |
31933 | + | |
dece6358 | 31934 | +static void au_nhash_de_do_free(struct hlist_head *head) |
1facf9fc | 31935 | +{ |
c06a8ce3 AM |
31936 | + struct au_vdir_dehstr *pos; |
31937 | + struct hlist_node *node; | |
1facf9fc | 31938 | + |
c06a8ce3 | 31939 | + hlist_for_each_entry_safe(pos, node, head, hash) |
1c60b727 | 31940 | + au_cache_free_vdir_dehstr(pos); |
1facf9fc | 31941 | +} |
31942 | + | |
dece6358 AM |
31943 | +static void au_nhash_do_free(struct au_nhash *nhash, |
31944 | + void (*free)(struct hlist_head *head)) | |
1facf9fc | 31945 | +{ |
1308ab2a | 31946 | + unsigned int n; |
1facf9fc | 31947 | + struct hlist_head *head; |
1facf9fc | 31948 | + |
dece6358 | 31949 | + n = nhash->nh_num; |
1308ab2a | 31950 | + if (!n) |
31951 | + return; | |
31952 | + | |
dece6358 | 31953 | + head = nhash->nh_head; |
1308ab2a | 31954 | + while (n-- > 0) { |
dece6358 AM |
31955 | + nhash_count(head); |
31956 | + free(head++); | |
1facf9fc | 31957 | + } |
9f237c51 | 31958 | + au_kfree_try_rcu(nhash->nh_head); |
1facf9fc | 31959 | +} |
31960 | + | |
dece6358 | 31961 | +void au_nhash_wh_free(struct au_nhash *whlist) |
1facf9fc | 31962 | +{ |
dece6358 AM |
31963 | + au_nhash_do_free(whlist, au_nhash_wh_do_free); |
31964 | +} | |
1facf9fc | 31965 | + |
dece6358 AM |
31966 | +static void au_nhash_de_free(struct au_nhash *delist) |
31967 | +{ | |
31968 | + au_nhash_do_free(delist, au_nhash_de_do_free); | |
1facf9fc | 31969 | +} |
31970 | + | |
31971 | +/* ---------------------------------------------------------------------- */ | |
31972 | + | |
31973 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, | |
31974 | + int limit) | |
31975 | +{ | |
31976 | + int num; | |
31977 | + unsigned int u, n; | |
31978 | + struct hlist_head *head; | |
c06a8ce3 | 31979 | + struct au_vdir_wh *pos; |
1facf9fc | 31980 | + |
31981 | + num = 0; | |
31982 | + n = whlist->nh_num; | |
31983 | + head = whlist->nh_head; | |
1308ab2a | 31984 | + for (u = 0; u < n; u++, head++) |
c06a8ce3 AM |
31985 | + hlist_for_each_entry(pos, head, wh_hash) |
31986 | + if (pos->wh_bindex == btgt && ++num > limit) | |
1facf9fc | 31987 | + return 1; |
1facf9fc | 31988 | + return 0; |
31989 | +} | |
31990 | + | |
31991 | +static struct hlist_head *au_name_hash(struct au_nhash *nhash, | |
dece6358 | 31992 | + unsigned char *name, |
1facf9fc | 31993 | + unsigned int len) |
31994 | +{ | |
dece6358 AM |
31995 | + unsigned int v; |
31996 | + /* const unsigned int magic_bit = 12; */ | |
31997 | + | |
1308ab2a | 31998 | + AuDebugOn(!nhash->nh_num || !nhash->nh_head); |
31999 | + | |
dece6358 | 32000 | + v = 0; |
f0c0a007 AM |
32001 | + if (len > 8) |
32002 | + len = 8; | |
dece6358 AM |
32003 | + while (len--) |
32004 | + v += *name++; | |
32005 | + /* v = hash_long(v, magic_bit); */ | |
32006 | + v %= nhash->nh_num; | |
32007 | + return nhash->nh_head + v; | |
32008 | +} | |
32009 | + | |
32010 | +static int au_nhash_test_name(struct au_vdir_destr *str, const char *name, | |
32011 | + int nlen) | |
32012 | +{ | |
32013 | + return str->len == nlen && !memcmp(str->name, name, nlen); | |
1facf9fc | 32014 | +} |
32015 | + | |
32016 | +/* returns found or not */ | |
dece6358 | 32017 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen) |
1facf9fc | 32018 | +{ |
32019 | + struct hlist_head *head; | |
c06a8ce3 | 32020 | + struct au_vdir_wh *pos; |
1facf9fc | 32021 | + struct au_vdir_destr *str; |
32022 | + | |
dece6358 | 32023 | + head = au_name_hash(whlist, name, nlen); |
c06a8ce3 AM |
32024 | + hlist_for_each_entry(pos, head, wh_hash) { |
32025 | + str = &pos->wh_str; | |
1facf9fc | 32026 | + AuDbg("%.*s\n", str->len, str->name); |
dece6358 AM |
32027 | + if (au_nhash_test_name(str, name, nlen)) |
32028 | + return 1; | |
32029 | + } | |
32030 | + return 0; | |
32031 | +} | |
32032 | + | |
32033 | +/* returns found(true) or not */ | |
32034 | +static int test_known(struct au_nhash *delist, char *name, int nlen) | |
32035 | +{ | |
32036 | + struct hlist_head *head; | |
c06a8ce3 | 32037 | + struct au_vdir_dehstr *pos; |
dece6358 AM |
32038 | + struct au_vdir_destr *str; |
32039 | + | |
32040 | + head = au_name_hash(delist, name, nlen); | |
c06a8ce3 AM |
32041 | + hlist_for_each_entry(pos, head, hash) { |
32042 | + str = pos->str; | |
dece6358 AM |
32043 | + AuDbg("%.*s\n", str->len, str->name); |
32044 | + if (au_nhash_test_name(str, name, nlen)) | |
1facf9fc | 32045 | + return 1; |
32046 | + } | |
32047 | + return 0; | |
32048 | +} | |
32049 | + | |
dece6358 AM |
32050 | +static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino, |
32051 | + unsigned char d_type) | |
32052 | +{ | |
32053 | +#ifdef CONFIG_AUFS_SHWH | |
32054 | + wh->wh_ino = ino; | |
32055 | + wh->wh_type = d_type; | |
32056 | +#endif | |
32057 | +} | |
32058 | + | |
32059 | +/* ---------------------------------------------------------------------- */ | |
32060 | + | |
32061 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
32062 | + unsigned int d_type, aufs_bindex_t bindex, | |
32063 | + unsigned char shwh) | |
1facf9fc | 32064 | +{ |
32065 | + int err; | |
32066 | + struct au_vdir_destr *str; | |
32067 | + struct au_vdir_wh *wh; | |
32068 | + | |
dece6358 | 32069 | + AuDbg("%.*s\n", nlen, name); |
1308ab2a | 32070 | + AuDebugOn(!whlist->nh_num || !whlist->nh_head); |
32071 | + | |
1facf9fc | 32072 | + err = -ENOMEM; |
dece6358 | 32073 | + wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS); |
1facf9fc | 32074 | + if (unlikely(!wh)) |
32075 | + goto out; | |
32076 | + | |
32077 | + err = 0; | |
32078 | + wh->wh_bindex = bindex; | |
dece6358 AM |
32079 | + if (shwh) |
32080 | + au_shwh_init_wh(wh, ino, d_type); | |
1facf9fc | 32081 | + str = &wh->wh_str; |
dece6358 AM |
32082 | + str->len = nlen; |
32083 | + memcpy(str->name, name, nlen); | |
32084 | + hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen)); | |
1facf9fc | 32085 | + /* smp_mb(); */ |
32086 | + | |
4f0767ce | 32087 | +out: |
1facf9fc | 32088 | + return err; |
32089 | +} | |
32090 | + | |
1facf9fc | 32091 | +static int append_deblk(struct au_vdir *vdir) |
32092 | +{ | |
32093 | + int err; | |
dece6358 | 32094 | + unsigned long ul; |
1facf9fc | 32095 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; |
32096 | + union au_vdir_deblk_p p, deblk_end; | |
32097 | + unsigned char **o; | |
32098 | + | |
32099 | + err = -ENOMEM; | |
e2f27e51 AM |
32100 | + o = au_krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1), |
32101 | + GFP_NOFS, /*may_shrink*/0); | |
1facf9fc | 32102 | + if (unlikely(!o)) |
32103 | + goto out; | |
32104 | + | |
32105 | + vdir->vd_deblk = o; | |
32106 | + p.deblk = kmalloc(deblk_sz, GFP_NOFS); | |
32107 | + if (p.deblk) { | |
32108 | + ul = vdir->vd_nblk++; | |
32109 | + vdir->vd_deblk[ul] = p.deblk; | |
32110 | + vdir->vd_last.ul = ul; | |
32111 | + vdir->vd_last.p.deblk = p.deblk; | |
32112 | + deblk_end.deblk = p.deblk + deblk_sz; | |
32113 | + err = set_deblk_end(&p, &deblk_end); | |
32114 | + } | |
32115 | + | |
4f0767ce | 32116 | +out: |
1facf9fc | 32117 | + return err; |
32118 | +} | |
32119 | + | |
dece6358 AM |
32120 | +static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino, |
32121 | + unsigned int d_type, struct au_nhash *delist) | |
32122 | +{ | |
32123 | + int err; | |
32124 | + unsigned int sz; | |
32125 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; | |
32126 | + union au_vdir_deblk_p p, *room, deblk_end; | |
32127 | + struct au_vdir_dehstr *dehstr; | |
32128 | + | |
32129 | + p.deblk = last_deblk(vdir); | |
32130 | + deblk_end.deblk = p.deblk + deblk_sz; | |
32131 | + room = &vdir->vd_last.p; | |
32132 | + AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk | |
32133 | + || !is_deblk_end(room, &deblk_end)); | |
32134 | + | |
32135 | + sz = calc_size(nlen); | |
32136 | + if (unlikely(sz > deblk_end.deblk - room->deblk)) { | |
32137 | + err = append_deblk(vdir); | |
32138 | + if (unlikely(err)) | |
32139 | + goto out; | |
32140 | + | |
32141 | + p.deblk = last_deblk(vdir); | |
32142 | + deblk_end.deblk = p.deblk + deblk_sz; | |
32143 | + /* smp_mb(); */ | |
32144 | + AuDebugOn(room->deblk != p.deblk); | |
32145 | + } | |
32146 | + | |
32147 | + err = -ENOMEM; | |
4a4d8108 | 32148 | + dehstr = au_cache_alloc_vdir_dehstr(); |
dece6358 AM |
32149 | + if (unlikely(!dehstr)) |
32150 | + goto out; | |
32151 | + | |
32152 | + dehstr->str = &room->de->de_str; | |
32153 | + hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen)); | |
32154 | + room->de->de_ino = ino; | |
32155 | + room->de->de_type = d_type; | |
32156 | + room->de->de_str.len = nlen; | |
32157 | + memcpy(room->de->de_str.name, name, nlen); | |
32158 | + | |
32159 | + err = 0; | |
32160 | + room->deblk += sz; | |
32161 | + if (unlikely(set_deblk_end(room, &deblk_end))) | |
32162 | + err = append_deblk(vdir); | |
32163 | + /* smp_mb(); */ | |
32164 | + | |
4f0767ce | 32165 | +out: |
dece6358 AM |
32166 | + return err; |
32167 | +} | |
32168 | + | |
32169 | +/* ---------------------------------------------------------------------- */ | |
32170 | + | |
1c60b727 | 32171 | +void au_vdir_free(struct au_vdir *vdir) |
dece6358 AM |
32172 | +{ |
32173 | + unsigned char **deblk; | |
32174 | + | |
32175 | + deblk = vdir->vd_deblk; | |
1c60b727 | 32176 | + while (vdir->vd_nblk--) |
9f237c51 AM |
32177 | + au_kfree_try_rcu(*deblk++); |
32178 | + au_kfree_try_rcu(vdir->vd_deblk); | |
1c60b727 | 32179 | + au_cache_free_vdir(vdir); |
dece6358 AM |
32180 | +} |
32181 | + | |
1308ab2a | 32182 | +static struct au_vdir *alloc_vdir(struct file *file) |
1facf9fc | 32183 | +{ |
32184 | + struct au_vdir *vdir; | |
1308ab2a | 32185 | + struct super_block *sb; |
1facf9fc | 32186 | + int err; |
32187 | + | |
2000de60 | 32188 | + sb = file->f_path.dentry->d_sb; |
dece6358 AM |
32189 | + SiMustAnyLock(sb); |
32190 | + | |
1facf9fc | 32191 | + err = -ENOMEM; |
32192 | + vdir = au_cache_alloc_vdir(); | |
32193 | + if (unlikely(!vdir)) | |
32194 | + goto out; | |
32195 | + | |
32196 | + vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS); | |
32197 | + if (unlikely(!vdir->vd_deblk)) | |
32198 | + goto out_free; | |
32199 | + | |
32200 | + vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk; | |
1308ab2a | 32201 | + if (!vdir->vd_deblk_sz) { |
79b8bda9 | 32202 | + /* estimate the appropriate size for deblk */ |
1308ab2a | 32203 | + vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL); |
4a4d8108 | 32204 | + /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */ |
1308ab2a | 32205 | + } |
1facf9fc | 32206 | + vdir->vd_nblk = 0; |
32207 | + vdir->vd_version = 0; | |
32208 | + vdir->vd_jiffy = 0; | |
32209 | + err = append_deblk(vdir); | |
32210 | + if (!err) | |
32211 | + return vdir; /* success */ | |
32212 | + | |
9f237c51 | 32213 | + au_kfree_try_rcu(vdir->vd_deblk); |
1facf9fc | 32214 | + |
4f0767ce | 32215 | +out_free: |
1c60b727 | 32216 | + au_cache_free_vdir(vdir); |
4f0767ce | 32217 | +out: |
1facf9fc | 32218 | + vdir = ERR_PTR(err); |
32219 | + return vdir; | |
32220 | +} | |
32221 | + | |
32222 | +static int reinit_vdir(struct au_vdir *vdir) | |
32223 | +{ | |
32224 | + int err; | |
32225 | + union au_vdir_deblk_p p, deblk_end; | |
32226 | + | |
32227 | + while (vdir->vd_nblk > 1) { | |
9f237c51 | 32228 | + au_kfree_try_rcu(vdir->vd_deblk[vdir->vd_nblk - 1]); |
1facf9fc | 32229 | + /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */ |
32230 | + vdir->vd_nblk--; | |
32231 | + } | |
32232 | + p.deblk = vdir->vd_deblk[0]; | |
32233 | + deblk_end.deblk = p.deblk + vdir->vd_deblk_sz; | |
32234 | + err = set_deblk_end(&p, &deblk_end); | |
32235 | + /* keep vd_dblk_sz */ | |
32236 | + vdir->vd_last.ul = 0; | |
32237 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
32238 | + vdir->vd_version = 0; | |
32239 | + vdir->vd_jiffy = 0; | |
32240 | + /* smp_mb(); */ | |
32241 | + return err; | |
32242 | +} | |
32243 | + | |
32244 | +/* ---------------------------------------------------------------------- */ | |
32245 | + | |
1facf9fc | 32246 | +#define AuFillVdir_CALLED 1 |
32247 | +#define AuFillVdir_WHABLE (1 << 1) | |
dece6358 | 32248 | +#define AuFillVdir_SHWH (1 << 2) |
1facf9fc | 32249 | +#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name) |
7f207e10 AM |
32250 | +#define au_fset_fillvdir(flags, name) \ |
32251 | + do { (flags) |= AuFillVdir_##name; } while (0) | |
32252 | +#define au_fclr_fillvdir(flags, name) \ | |
32253 | + do { (flags) &= ~AuFillVdir_##name; } while (0) | |
1facf9fc | 32254 | + |
dece6358 AM |
32255 | +#ifndef CONFIG_AUFS_SHWH |
32256 | +#undef AuFillVdir_SHWH | |
32257 | +#define AuFillVdir_SHWH 0 | |
32258 | +#endif | |
32259 | + | |
1facf9fc | 32260 | +struct fillvdir_arg { |
392086de | 32261 | + struct dir_context ctx; |
1facf9fc | 32262 | + struct file *file; |
32263 | + struct au_vdir *vdir; | |
dece6358 AM |
32264 | + struct au_nhash delist; |
32265 | + struct au_nhash whlist; | |
1facf9fc | 32266 | + aufs_bindex_t bindex; |
32267 | + unsigned int flags; | |
32268 | + int err; | |
32269 | +}; | |
32270 | + | |
392086de | 32271 | +static int fillvdir(struct dir_context *ctx, const char *__name, int nlen, |
1facf9fc | 32272 | + loff_t offset __maybe_unused, u64 h_ino, |
32273 | + unsigned int d_type) | |
32274 | +{ | |
392086de | 32275 | + struct fillvdir_arg *arg = container_of(ctx, struct fillvdir_arg, ctx); |
1facf9fc | 32276 | + char *name = (void *)__name; |
32277 | + struct super_block *sb; | |
1facf9fc | 32278 | + ino_t ino; |
dece6358 | 32279 | + const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH); |
1facf9fc | 32280 | + |
1facf9fc | 32281 | + arg->err = 0; |
2000de60 | 32282 | + sb = arg->file->f_path.dentry->d_sb; |
1facf9fc | 32283 | + au_fset_fillvdir(arg->flags, CALLED); |
32284 | + /* smp_mb(); */ | |
dece6358 | 32285 | + if (nlen <= AUFS_WH_PFX_LEN |
1facf9fc | 32286 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { |
dece6358 AM |
32287 | + if (test_known(&arg->delist, name, nlen) |
32288 | + || au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
32289 | + goto out; /* already exists or whiteouted */ | |
1facf9fc | 32290 | + |
dece6358 | 32291 | + arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino); |
4a4d8108 AM |
32292 | + if (!arg->err) { |
32293 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) | |
32294 | + d_type = DT_UNKNOWN; | |
dece6358 AM |
32295 | + arg->err = append_de(arg->vdir, name, nlen, ino, |
32296 | + d_type, &arg->delist); | |
4a4d8108 | 32297 | + } |
1facf9fc | 32298 | + } else if (au_ftest_fillvdir(arg->flags, WHABLE)) { |
32299 | + name += AUFS_WH_PFX_LEN; | |
dece6358 AM |
32300 | + nlen -= AUFS_WH_PFX_LEN; |
32301 | + if (au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
32302 | + goto out; /* already whiteouted */ | |
1facf9fc | 32303 | + |
acd2b654 | 32304 | + ino = 0; /* just to suppress a warning */ |
dece6358 AM |
32305 | + if (shwh) |
32306 | + arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type, | |
32307 | + &ino); | |
4a4d8108 AM |
32308 | + if (!arg->err) { |
32309 | + if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN) | |
32310 | + d_type = DT_UNKNOWN; | |
1facf9fc | 32311 | + arg->err = au_nhash_append_wh |
dece6358 AM |
32312 | + (&arg->whlist, name, nlen, ino, d_type, |
32313 | + arg->bindex, shwh); | |
4a4d8108 | 32314 | + } |
1facf9fc | 32315 | + } |
32316 | + | |
4f0767ce | 32317 | +out: |
1facf9fc | 32318 | + if (!arg->err) |
32319 | + arg->vdir->vd_jiffy = jiffies; | |
32320 | + /* smp_mb(); */ | |
32321 | + AuTraceErr(arg->err); | |
32322 | + return arg->err; | |
32323 | +} | |
32324 | + | |
dece6358 AM |
32325 | +static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir, |
32326 | + struct au_nhash *whlist, struct au_nhash *delist) | |
32327 | +{ | |
32328 | +#ifdef CONFIG_AUFS_SHWH | |
32329 | + int err; | |
32330 | + unsigned int nh, u; | |
32331 | + struct hlist_head *head; | |
c06a8ce3 AM |
32332 | + struct au_vdir_wh *pos; |
32333 | + struct hlist_node *n; | |
dece6358 AM |
32334 | + char *p, *o; |
32335 | + struct au_vdir_destr *destr; | |
32336 | + | |
32337 | + AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH)); | |
32338 | + | |
32339 | + err = -ENOMEM; | |
537831f9 | 32340 | + o = p = (void *)__get_free_page(GFP_NOFS); |
dece6358 AM |
32341 | + if (unlikely(!p)) |
32342 | + goto out; | |
32343 | + | |
32344 | + err = 0; | |
32345 | + nh = whlist->nh_num; | |
32346 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
32347 | + p += AUFS_WH_PFX_LEN; | |
32348 | + for (u = 0; u < nh; u++) { | |
32349 | + head = whlist->nh_head + u; | |
c06a8ce3 AM |
32350 | + hlist_for_each_entry_safe(pos, n, head, wh_hash) { |
32351 | + destr = &pos->wh_str; | |
dece6358 AM |
32352 | + memcpy(p, destr->name, destr->len); |
32353 | + err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN, | |
c06a8ce3 | 32354 | + pos->wh_ino, pos->wh_type, delist); |
dece6358 AM |
32355 | + if (unlikely(err)) |
32356 | + break; | |
32357 | + } | |
32358 | + } | |
32359 | + | |
1c60b727 | 32360 | + free_page((unsigned long)o); |
dece6358 | 32361 | + |
4f0767ce | 32362 | +out: |
dece6358 AM |
32363 | + AuTraceErr(err); |
32364 | + return err; | |
32365 | +#else | |
32366 | + return 0; | |
32367 | +#endif | |
32368 | +} | |
32369 | + | |
1facf9fc | 32370 | +static int au_do_read_vdir(struct fillvdir_arg *arg) |
32371 | +{ | |
32372 | + int err; | |
dece6358 | 32373 | + unsigned int rdhash; |
1facf9fc | 32374 | + loff_t offset; |
5afbbe0d | 32375 | + aufs_bindex_t bbot, bindex, btop; |
dece6358 | 32376 | + unsigned char shwh; |
1facf9fc | 32377 | + struct file *hf, *file; |
32378 | + struct super_block *sb; | |
32379 | + | |
1facf9fc | 32380 | + file = arg->file; |
2000de60 | 32381 | + sb = file->f_path.dentry->d_sb; |
dece6358 AM |
32382 | + SiMustAnyLock(sb); |
32383 | + | |
32384 | + rdhash = au_sbi(sb)->si_rdhash; | |
1308ab2a | 32385 | + if (!rdhash) |
32386 | + rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL)); | |
dece6358 AM |
32387 | + err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS); |
32388 | + if (unlikely(err)) | |
1facf9fc | 32389 | + goto out; |
dece6358 AM |
32390 | + err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS); |
32391 | + if (unlikely(err)) | |
1facf9fc | 32392 | + goto out_delist; |
32393 | + | |
32394 | + err = 0; | |
32395 | + arg->flags = 0; | |
dece6358 AM |
32396 | + shwh = 0; |
32397 | + if (au_opt_test(au_mntflags(sb), SHWH)) { | |
32398 | + shwh = 1; | |
32399 | + au_fset_fillvdir(arg->flags, SHWH); | |
32400 | + } | |
5afbbe0d AM |
32401 | + btop = au_fbtop(file); |
32402 | + bbot = au_fbbot_dir(file); | |
32403 | + for (bindex = btop; !err && bindex <= bbot; bindex++) { | |
4a4d8108 | 32404 | + hf = au_hf_dir(file, bindex); |
1facf9fc | 32405 | + if (!hf) |
32406 | + continue; | |
32407 | + | |
32408 | + offset = vfsub_llseek(hf, 0, SEEK_SET); | |
32409 | + err = offset; | |
32410 | + if (unlikely(offset)) | |
32411 | + break; | |
32412 | + | |
32413 | + arg->bindex = bindex; | |
32414 | + au_fclr_fillvdir(arg->flags, WHABLE); | |
dece6358 | 32415 | + if (shwh |
5afbbe0d | 32416 | + || (bindex != bbot |
dece6358 | 32417 | + && au_br_whable(au_sbr_perm(sb, bindex)))) |
1facf9fc | 32418 | + au_fset_fillvdir(arg->flags, WHABLE); |
32419 | + do { | |
32420 | + arg->err = 0; | |
32421 | + au_fclr_fillvdir(arg->flags, CALLED); | |
32422 | + /* smp_mb(); */ | |
392086de | 32423 | + err = vfsub_iterate_dir(hf, &arg->ctx); |
1facf9fc | 32424 | + if (err >= 0) |
32425 | + err = arg->err; | |
32426 | + } while (!err && au_ftest_fillvdir(arg->flags, CALLED)); | |
392086de AM |
32427 | + |
32428 | + /* | |
32429 | + * dir_relax() may be good for concurrency, but aufs should not | |
32430 | + * use it since it will cause a lockdep problem. | |
32431 | + */ | |
1facf9fc | 32432 | + } |
dece6358 AM |
32433 | + |
32434 | + if (!err && shwh) | |
32435 | + err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist); | |
32436 | + | |
32437 | + au_nhash_wh_free(&arg->whlist); | |
1facf9fc | 32438 | + |
4f0767ce | 32439 | +out_delist: |
dece6358 | 32440 | + au_nhash_de_free(&arg->delist); |
4f0767ce | 32441 | +out: |
1facf9fc | 32442 | + return err; |
32443 | +} | |
32444 | + | |
32445 | +static int read_vdir(struct file *file, int may_read) | |
32446 | +{ | |
32447 | + int err; | |
32448 | + unsigned long expire; | |
32449 | + unsigned char do_read; | |
392086de AM |
32450 | + struct fillvdir_arg arg = { |
32451 | + .ctx = { | |
2000de60 | 32452 | + .actor = fillvdir |
392086de AM |
32453 | + } |
32454 | + }; | |
1facf9fc | 32455 | + struct inode *inode; |
32456 | + struct au_vdir *vdir, *allocated; | |
32457 | + | |
32458 | + err = 0; | |
c06a8ce3 | 32459 | + inode = file_inode(file); |
1facf9fc | 32460 | + IMustLock(inode); |
5afbbe0d | 32461 | + IiMustWriteLock(inode); |
dece6358 AM |
32462 | + SiMustAnyLock(inode->i_sb); |
32463 | + | |
1facf9fc | 32464 | + allocated = NULL; |
32465 | + do_read = 0; | |
32466 | + expire = au_sbi(inode->i_sb)->si_rdcache; | |
32467 | + vdir = au_ivdir(inode); | |
32468 | + if (!vdir) { | |
32469 | + do_read = 1; | |
1308ab2a | 32470 | + vdir = alloc_vdir(file); |
1facf9fc | 32471 | + err = PTR_ERR(vdir); |
32472 | + if (IS_ERR(vdir)) | |
32473 | + goto out; | |
32474 | + err = 0; | |
32475 | + allocated = vdir; | |
32476 | + } else if (may_read | |
be118d29 | 32477 | + && (!inode_eq_iversion(inode, vdir->vd_version) |
1facf9fc | 32478 | + || time_after(jiffies, vdir->vd_jiffy + expire))) { |
32479 | + do_read = 1; | |
32480 | + err = reinit_vdir(vdir); | |
32481 | + if (unlikely(err)) | |
32482 | + goto out; | |
32483 | + } | |
32484 | + | |
32485 | + if (!do_read) | |
32486 | + return 0; /* success */ | |
32487 | + | |
32488 | + arg.file = file; | |
32489 | + arg.vdir = vdir; | |
32490 | + err = au_do_read_vdir(&arg); | |
32491 | + if (!err) { | |
392086de | 32492 | + /* file->f_pos = 0; */ /* todo: ctx->pos? */ |
be118d29 | 32493 | + vdir->vd_version = inode_query_iversion(inode); |
1facf9fc | 32494 | + vdir->vd_last.ul = 0; |
32495 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
32496 | + if (allocated) | |
32497 | + au_set_ivdir(inode, allocated); | |
32498 | + } else if (allocated) | |
1c60b727 | 32499 | + au_vdir_free(allocated); |
1facf9fc | 32500 | + |
4f0767ce | 32501 | +out: |
1facf9fc | 32502 | + return err; |
32503 | +} | |
32504 | + | |
32505 | +static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src) | |
32506 | +{ | |
32507 | + int err, rerr; | |
32508 | + unsigned long ul, n; | |
32509 | + const unsigned int deblk_sz = src->vd_deblk_sz; | |
32510 | + | |
32511 | + AuDebugOn(tgt->vd_nblk != 1); | |
32512 | + | |
32513 | + err = -ENOMEM; | |
32514 | + if (tgt->vd_nblk < src->vd_nblk) { | |
32515 | + unsigned char **p; | |
32516 | + | |
e2f27e51 AM |
32517 | + p = au_krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk, |
32518 | + GFP_NOFS, /*may_shrink*/0); | |
1facf9fc | 32519 | + if (unlikely(!p)) |
32520 | + goto out; | |
32521 | + tgt->vd_deblk = p; | |
32522 | + } | |
32523 | + | |
1308ab2a | 32524 | + if (tgt->vd_deblk_sz != deblk_sz) { |
32525 | + unsigned char *p; | |
32526 | + | |
32527 | + tgt->vd_deblk_sz = deblk_sz; | |
e2f27e51 AM |
32528 | + p = au_krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS, |
32529 | + /*may_shrink*/1); | |
1308ab2a | 32530 | + if (unlikely(!p)) |
32531 | + goto out; | |
32532 | + tgt->vd_deblk[0] = p; | |
32533 | + } | |
1facf9fc | 32534 | + memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz); |
1facf9fc | 32535 | + tgt->vd_version = src->vd_version; |
32536 | + tgt->vd_jiffy = src->vd_jiffy; | |
32537 | + | |
32538 | + n = src->vd_nblk; | |
32539 | + for (ul = 1; ul < n; ul++) { | |
dece6358 AM |
32540 | + tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz, |
32541 | + GFP_NOFS); | |
32542 | + if (unlikely(!tgt->vd_deblk[ul])) | |
1facf9fc | 32543 | + goto out; |
1308ab2a | 32544 | + tgt->vd_nblk++; |
1facf9fc | 32545 | + } |
1308ab2a | 32546 | + tgt->vd_nblk = n; |
32547 | + tgt->vd_last.ul = tgt->vd_last.ul; | |
32548 | + tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul]; | |
32549 | + tgt->vd_last.p.deblk += src->vd_last.p.deblk | |
32550 | + - src->vd_deblk[src->vd_last.ul]; | |
1facf9fc | 32551 | + /* smp_mb(); */ |
32552 | + return 0; /* success */ | |
32553 | + | |
4f0767ce | 32554 | +out: |
1facf9fc | 32555 | + rerr = reinit_vdir(tgt); |
32556 | + BUG_ON(rerr); | |
32557 | + return err; | |
32558 | +} | |
32559 | + | |
32560 | +int au_vdir_init(struct file *file) | |
32561 | +{ | |
32562 | + int err; | |
32563 | + struct inode *inode; | |
32564 | + struct au_vdir *vdir_cache, *allocated; | |
32565 | + | |
392086de | 32566 | + /* test file->f_pos here instead of ctx->pos */ |
1facf9fc | 32567 | + err = read_vdir(file, !file->f_pos); |
32568 | + if (unlikely(err)) | |
32569 | + goto out; | |
32570 | + | |
32571 | + allocated = NULL; | |
32572 | + vdir_cache = au_fvdir_cache(file); | |
32573 | + if (!vdir_cache) { | |
1308ab2a | 32574 | + vdir_cache = alloc_vdir(file); |
1facf9fc | 32575 | + err = PTR_ERR(vdir_cache); |
32576 | + if (IS_ERR(vdir_cache)) | |
32577 | + goto out; | |
32578 | + allocated = vdir_cache; | |
32579 | + } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) { | |
392086de | 32580 | + /* test file->f_pos here instead of ctx->pos */ |
1facf9fc | 32581 | + err = reinit_vdir(vdir_cache); |
32582 | + if (unlikely(err)) | |
32583 | + goto out; | |
32584 | + } else | |
32585 | + return 0; /* success */ | |
32586 | + | |
c06a8ce3 | 32587 | + inode = file_inode(file); |
1facf9fc | 32588 | + err = copy_vdir(vdir_cache, au_ivdir(inode)); |
32589 | + if (!err) { | |
be118d29 | 32590 | + file->f_version = inode_query_iversion(inode); |
1facf9fc | 32591 | + if (allocated) |
32592 | + au_set_fvdir_cache(file, allocated); | |
32593 | + } else if (allocated) | |
1c60b727 | 32594 | + au_vdir_free(allocated); |
1facf9fc | 32595 | + |
4f0767ce | 32596 | +out: |
1facf9fc | 32597 | + return err; |
32598 | +} | |
32599 | + | |
32600 | +static loff_t calc_offset(struct au_vdir *vdir) | |
32601 | +{ | |
32602 | + loff_t offset; | |
32603 | + union au_vdir_deblk_p p; | |
32604 | + | |
32605 | + p.deblk = vdir->vd_deblk[vdir->vd_last.ul]; | |
32606 | + offset = vdir->vd_last.p.deblk - p.deblk; | |
32607 | + offset += vdir->vd_deblk_sz * vdir->vd_last.ul; | |
32608 | + return offset; | |
32609 | +} | |
32610 | + | |
32611 | +/* returns true or false */ | |
392086de | 32612 | +static int seek_vdir(struct file *file, struct dir_context *ctx) |
1facf9fc | 32613 | +{ |
32614 | + int valid; | |
32615 | + unsigned int deblk_sz; | |
32616 | + unsigned long ul, n; | |
32617 | + loff_t offset; | |
32618 | + union au_vdir_deblk_p p, deblk_end; | |
32619 | + struct au_vdir *vdir_cache; | |
32620 | + | |
32621 | + valid = 1; | |
32622 | + vdir_cache = au_fvdir_cache(file); | |
32623 | + offset = calc_offset(vdir_cache); | |
32624 | + AuDbg("offset %lld\n", offset); | |
392086de | 32625 | + if (ctx->pos == offset) |
1facf9fc | 32626 | + goto out; |
32627 | + | |
32628 | + vdir_cache->vd_last.ul = 0; | |
32629 | + vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0]; | |
392086de | 32630 | + if (!ctx->pos) |
1facf9fc | 32631 | + goto out; |
32632 | + | |
32633 | + valid = 0; | |
32634 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
392086de | 32635 | + ul = div64_u64(ctx->pos, deblk_sz); |
1facf9fc | 32636 | + AuDbg("ul %lu\n", ul); |
32637 | + if (ul >= vdir_cache->vd_nblk) | |
32638 | + goto out; | |
32639 | + | |
32640 | + n = vdir_cache->vd_nblk; | |
32641 | + for (; ul < n; ul++) { | |
32642 | + p.deblk = vdir_cache->vd_deblk[ul]; | |
32643 | + deblk_end.deblk = p.deblk + deblk_sz; | |
32644 | + offset = ul; | |
32645 | + offset *= deblk_sz; | |
392086de | 32646 | + while (!is_deblk_end(&p, &deblk_end) && offset < ctx->pos) { |
1facf9fc | 32647 | + unsigned int l; |
32648 | + | |
32649 | + l = calc_size(p.de->de_str.len); | |
32650 | + offset += l; | |
32651 | + p.deblk += l; | |
32652 | + } | |
32653 | + if (!is_deblk_end(&p, &deblk_end)) { | |
32654 | + valid = 1; | |
32655 | + vdir_cache->vd_last.ul = ul; | |
32656 | + vdir_cache->vd_last.p = p; | |
32657 | + break; | |
32658 | + } | |
32659 | + } | |
32660 | + | |
4f0767ce | 32661 | +out: |
1facf9fc | 32662 | + /* smp_mb(); */ |
b00004a5 AM |
32663 | + if (!valid) |
32664 | + AuDbg("valid %d\n", !valid); | |
1facf9fc | 32665 | + return valid; |
32666 | +} | |
32667 | + | |
392086de | 32668 | +int au_vdir_fill_de(struct file *file, struct dir_context *ctx) |
1facf9fc | 32669 | +{ |
1facf9fc | 32670 | + unsigned int l, deblk_sz; |
32671 | + union au_vdir_deblk_p deblk_end; | |
32672 | + struct au_vdir *vdir_cache; | |
32673 | + struct au_vdir_de *de; | |
32674 | + | |
392086de | 32675 | + if (!seek_vdir(file, ctx)) |
1facf9fc | 32676 | + return 0; |
32677 | + | |
acd2b654 | 32678 | + vdir_cache = au_fvdir_cache(file); |
1facf9fc | 32679 | + deblk_sz = vdir_cache->vd_deblk_sz; |
32680 | + while (1) { | |
32681 | + deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
32682 | + deblk_end.deblk += deblk_sz; | |
32683 | + while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) { | |
32684 | + de = vdir_cache->vd_last.p.de; | |
32685 | + AuDbg("%.*s, off%lld, i%lu, dt%d\n", | |
392086de | 32686 | + de->de_str.len, de->de_str.name, ctx->pos, |
1facf9fc | 32687 | + (unsigned long)de->de_ino, de->de_type); |
392086de AM |
32688 | + if (unlikely(!dir_emit(ctx, de->de_str.name, |
32689 | + de->de_str.len, de->de_ino, | |
32690 | + de->de_type))) { | |
1facf9fc | 32691 | + /* todo: ignore the error caused by udba? */ |
32692 | + /* return err; */ | |
32693 | + return 0; | |
32694 | + } | |
32695 | + | |
32696 | + l = calc_size(de->de_str.len); | |
32697 | + vdir_cache->vd_last.p.deblk += l; | |
392086de | 32698 | + ctx->pos += l; |
1facf9fc | 32699 | + } |
32700 | + if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) { | |
32701 | + vdir_cache->vd_last.ul++; | |
32702 | + vdir_cache->vd_last.p.deblk | |
32703 | + = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
392086de | 32704 | + ctx->pos = deblk_sz * vdir_cache->vd_last.ul; |
1facf9fc | 32705 | + continue; |
32706 | + } | |
32707 | + break; | |
32708 | + } | |
32709 | + | |
32710 | + /* smp_mb(); */ | |
32711 | + return 0; | |
32712 | +} | |
7f207e10 | 32713 | diff -urN /usr/share/empty/fs/aufs/vfsub.c linux/fs/aufs/vfsub.c |
eca34b5c | 32714 | --- /usr/share/empty/fs/aufs/vfsub.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 32715 | +++ linux/fs/aufs/vfsub.c 2020-01-27 10:57:18.178871751 +0100 |
acd2b654 | 32716 | @@ -0,0 +1,902 @@ |
cd7a4cd9 | 32717 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 32718 | +/* |
016522bc | 32719 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 32720 | + * |
32721 | + * This program, aufs is free software; you can redistribute it and/or modify | |
32722 | + * it under the terms of the GNU General Public License as published by | |
32723 | + * the Free Software Foundation; either version 2 of the License, or | |
32724 | + * (at your option) any later version. | |
dece6358 AM |
32725 | + * |
32726 | + * This program is distributed in the hope that it will be useful, | |
32727 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
32728 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
32729 | + * GNU General Public License for more details. | |
32730 | + * | |
32731 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 32732 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 32733 | + */ |
32734 | + | |
32735 | +/* | |
32736 | + * sub-routines for VFS | |
32737 | + */ | |
32738 | + | |
8b6a4947 | 32739 | +#include <linux/mnt_namespace.h> |
dece6358 | 32740 | +#include <linux/namei.h> |
8cdd5066 | 32741 | +#include <linux/nsproxy.h> |
dece6358 AM |
32742 | +#include <linux/security.h> |
32743 | +#include <linux/splice.h> | |
1facf9fc | 32744 | +#include "aufs.h" |
32745 | + | |
8cdd5066 JR |
32746 | +#ifdef CONFIG_AUFS_BR_FUSE |
32747 | +int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb) | |
32748 | +{ | |
8cdd5066 JR |
32749 | + if (!au_test_fuse(h_sb) || !au_userns) |
32750 | + return 0; | |
32751 | + | |
8b6a4947 | 32752 | + return is_current_mnt_ns(mnt) ? 0 : -EACCES; |
8cdd5066 JR |
32753 | +} |
32754 | +#endif | |
32755 | + | |
a2654f78 AM |
32756 | +int vfsub_sync_filesystem(struct super_block *h_sb, int wait) |
32757 | +{ | |
32758 | + int err; | |
32759 | + | |
32760 | + lockdep_off(); | |
32761 | + down_read(&h_sb->s_umount); | |
32762 | + err = __sync_filesystem(h_sb, wait); | |
32763 | + up_read(&h_sb->s_umount); | |
32764 | + lockdep_on(); | |
32765 | + | |
32766 | + return err; | |
32767 | +} | |
32768 | + | |
8cdd5066 JR |
32769 | +/* ---------------------------------------------------------------------- */ |
32770 | + | |
1facf9fc | 32771 | +int vfsub_update_h_iattr(struct path *h_path, int *did) |
32772 | +{ | |
32773 | + int err; | |
32774 | + struct kstat st; | |
32775 | + struct super_block *h_sb; | |
32776 | + | |
32777 | + /* for remote fs, leave work for its getattr or d_revalidate */ | |
32778 | + /* for bad i_attr fs, handle them in aufs_getattr() */ | |
32779 | + /* still some fs may acquire i_mutex. we need to skip them */ | |
32780 | + err = 0; | |
32781 | + if (!did) | |
32782 | + did = &err; | |
32783 | + h_sb = h_path->dentry->d_sb; | |
32784 | + *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb)); | |
32785 | + if (*did) | |
521ced18 | 32786 | + err = vfsub_getattr(h_path, &st); |
1facf9fc | 32787 | + |
32788 | + return err; | |
32789 | +} | |
32790 | + | |
32791 | +/* ---------------------------------------------------------------------- */ | |
32792 | + | |
4a4d8108 | 32793 | +struct file *vfsub_dentry_open(struct path *path, int flags) |
1308ab2a | 32794 | +{ |
32795 | + struct file *file; | |
32796 | + | |
b4510431 | 32797 | + file = dentry_open(path, flags /* | __FMODE_NONOTIFY */, |
7f207e10 | 32798 | + current_cred()); |
2cbb1c4b JR |
32799 | + if (!IS_ERR_OR_NULL(file) |
32800 | + && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) | |
5527c038 | 32801 | + i_readcount_inc(d_inode(path->dentry)); |
4a4d8108 | 32802 | + |
1308ab2a | 32803 | + return file; |
32804 | +} | |
32805 | + | |
1facf9fc | 32806 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode) |
32807 | +{ | |
32808 | + struct file *file; | |
32809 | + | |
2cbb1c4b | 32810 | + lockdep_off(); |
7f207e10 | 32811 | + file = filp_open(path, |
2cbb1c4b | 32812 | + oflags /* | __FMODE_NONOTIFY */, |
7f207e10 | 32813 | + mode); |
2cbb1c4b | 32814 | + lockdep_on(); |
1facf9fc | 32815 | + if (IS_ERR(file)) |
32816 | + goto out; | |
32817 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
32818 | + | |
4f0767ce | 32819 | +out: |
1facf9fc | 32820 | + return file; |
32821 | +} | |
32822 | + | |
b912730e AM |
32823 | +/* |
32824 | + * Ideally this function should call VFS:do_last() in order to keep all its | |
32825 | + * checkings. But it is very hard for aufs to regenerate several VFS internal | |
32826 | + * structure such as nameidata. This is a second (or third) best approach. | |
32827 | + * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open(). | |
32828 | + */ | |
32829 | +int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, | |
acd2b654 | 32830 | + struct vfsub_aopen_args *args) |
b912730e AM |
32831 | +{ |
32832 | + int err; | |
acd2b654 | 32833 | + struct au_branch *br = args->br; |
b912730e AM |
32834 | + struct file *file = args->file; |
32835 | + /* copied from linux/fs/namei.c:atomic_open() */ | |
32836 | + struct dentry *const DENTRY_NOT_SET = (void *)-1UL; | |
32837 | + | |
32838 | + IMustLock(dir); | |
32839 | + AuDebugOn(!dir->i_op->atomic_open); | |
32840 | + | |
32841 | + err = au_br_test_oflag(args->open_flag, br); | |
32842 | + if (unlikely(err)) | |
32843 | + goto out; | |
32844 | + | |
acd2b654 AM |
32845 | + au_lcnt_inc(&br->br_nfiles); |
32846 | + file->f_path.dentry = DENTRY_NOT_SET; | |
32847 | + file->f_path.mnt = au_br_mnt(br); | |
32848 | + AuDbg("%ps\n", dir->i_op->atomic_open); | |
b912730e | 32849 | + err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag, |
acd2b654 AM |
32850 | + args->create_mode); |
32851 | + if (unlikely(err < 0)) { | |
32852 | + au_lcnt_dec(&br->br_nfiles); | |
b912730e | 32853 | + goto out; |
acd2b654 | 32854 | + } |
b912730e | 32855 | + |
acd2b654 AM |
32856 | + /* temporary workaround for nfsv4 branch */ |
32857 | + if (au_test_nfs(dir->i_sb)) | |
32858 | + nfs_mark_for_revalidate(dir); | |
b912730e | 32859 | + |
acd2b654 AM |
32860 | + if (file->f_mode & FMODE_CREATED) |
32861 | + fsnotify_create(dir, dentry); | |
32862 | + if (!(file->f_mode & FMODE_OPENED)) { | |
32863 | + au_lcnt_dec(&br->br_nfiles); | |
32864 | + goto out; | |
b912730e AM |
32865 | + } |
32866 | + | |
acd2b654 AM |
32867 | + /* todo: call VFS:may_open() here */ |
32868 | + /* todo: ima_file_check() too? */ | |
32869 | + if (!err && (args->open_flag & __FMODE_EXEC)) | |
32870 | + err = deny_write_access(file); | |
32871 | + if (!err) | |
32872 | + fsnotify_open(file); | |
32873 | + else | |
32874 | + au_lcnt_dec(&br->br_nfiles); | |
32875 | + /* note that the file is created and still opened */ | |
b912730e AM |
32876 | + |
32877 | +out: | |
32878 | + return err; | |
32879 | +} | |
32880 | + | |
1facf9fc | 32881 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path) |
32882 | +{ | |
32883 | + int err; | |
32884 | + | |
1facf9fc | 32885 | + err = kern_path(name, flags, path); |
5527c038 | 32886 | + if (!err && d_is_positive(path->dentry)) |
1facf9fc | 32887 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ |
32888 | + return err; | |
32889 | +} | |
32890 | + | |
febd17d6 JR |
32891 | +struct dentry *vfsub_lookup_one_len_unlocked(const char *name, |
32892 | + struct dentry *parent, int len) | |
32893 | +{ | |
32894 | + struct path path = { | |
32895 | + .mnt = NULL | |
32896 | + }; | |
32897 | + | |
32898 | + path.dentry = lookup_one_len_unlocked(name, parent, len); | |
32899 | + if (IS_ERR(path.dentry)) | |
32900 | + goto out; | |
32901 | + if (d_is_positive(path.dentry)) | |
32902 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ | |
32903 | + | |
32904 | +out: | |
32905 | + AuTraceErrPtr(path.dentry); | |
32906 | + return path.dentry; | |
32907 | +} | |
32908 | + | |
1facf9fc | 32909 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, |
32910 | + int len) | |
32911 | +{ | |
32912 | + struct path path = { | |
32913 | + .mnt = NULL | |
32914 | + }; | |
32915 | + | |
1308ab2a | 32916 | + /* VFS checks it too, but by WARN_ON_ONCE() */ |
5527c038 | 32917 | + IMustLock(d_inode(parent)); |
1facf9fc | 32918 | + |
32919 | + path.dentry = lookup_one_len(name, parent, len); | |
32920 | + if (IS_ERR(path.dentry)) | |
32921 | + goto out; | |
5527c038 | 32922 | + if (d_is_positive(path.dentry)) |
1facf9fc | 32923 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ |
32924 | + | |
4f0767ce | 32925 | +out: |
4a4d8108 | 32926 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 32927 | + return path.dentry; |
32928 | +} | |
32929 | + | |
b4510431 | 32930 | +void vfsub_call_lkup_one(void *args) |
2cbb1c4b | 32931 | +{ |
b4510431 AM |
32932 | + struct vfsub_lkup_one_args *a = args; |
32933 | + *a->errp = vfsub_lkup_one(a->name, a->parent); | |
2cbb1c4b JR |
32934 | +} |
32935 | + | |
1facf9fc | 32936 | +/* ---------------------------------------------------------------------- */ |
32937 | + | |
32938 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
32939 | + struct dentry *d2, struct au_hinode *hdir2) | |
32940 | +{ | |
32941 | + struct dentry *d; | |
32942 | + | |
2cbb1c4b | 32943 | + lockdep_off(); |
1facf9fc | 32944 | + d = lock_rename(d1, d2); |
2cbb1c4b | 32945 | + lockdep_on(); |
4a4d8108 | 32946 | + au_hn_suspend(hdir1); |
1facf9fc | 32947 | + if (hdir1 != hdir2) |
4a4d8108 | 32948 | + au_hn_suspend(hdir2); |
1facf9fc | 32949 | + |
32950 | + return d; | |
32951 | +} | |
32952 | + | |
32953 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
32954 | + struct dentry *d2, struct au_hinode *hdir2) | |
32955 | +{ | |
4a4d8108 | 32956 | + au_hn_resume(hdir1); |
1facf9fc | 32957 | + if (hdir1 != hdir2) |
4a4d8108 | 32958 | + au_hn_resume(hdir2); |
2cbb1c4b | 32959 | + lockdep_off(); |
1facf9fc | 32960 | + unlock_rename(d1, d2); |
2cbb1c4b | 32961 | + lockdep_on(); |
1facf9fc | 32962 | +} |
32963 | + | |
32964 | +/* ---------------------------------------------------------------------- */ | |
32965 | + | |
b4510431 | 32966 | +int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl) |
1facf9fc | 32967 | +{ |
32968 | + int err; | |
32969 | + struct dentry *d; | |
32970 | + | |
32971 | + IMustLock(dir); | |
32972 | + | |
32973 | + d = path->dentry; | |
32974 | + path->dentry = d->d_parent; | |
b752ccd1 | 32975 | + err = security_path_mknod(path, d, mode, 0); |
1facf9fc | 32976 | + path->dentry = d; |
32977 | + if (unlikely(err)) | |
32978 | + goto out; | |
32979 | + | |
c1595e42 | 32980 | + lockdep_off(); |
b4510431 | 32981 | + err = vfs_create(dir, path->dentry, mode, want_excl); |
c1595e42 | 32982 | + lockdep_on(); |
1facf9fc | 32983 | + if (!err) { |
32984 | + struct path tmp = *path; | |
32985 | + int did; | |
32986 | + | |
32987 | + vfsub_update_h_iattr(&tmp, &did); | |
32988 | + if (did) { | |
32989 | + tmp.dentry = path->dentry->d_parent; | |
32990 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32991 | + } | |
32992 | + /*ignore*/ | |
32993 | + } | |
32994 | + | |
4f0767ce | 32995 | +out: |
1facf9fc | 32996 | + return err; |
32997 | +} | |
32998 | + | |
32999 | +int vfsub_symlink(struct inode *dir, struct path *path, const char *symname) | |
33000 | +{ | |
33001 | + int err; | |
33002 | + struct dentry *d; | |
33003 | + | |
33004 | + IMustLock(dir); | |
33005 | + | |
33006 | + d = path->dentry; | |
33007 | + path->dentry = d->d_parent; | |
b752ccd1 | 33008 | + err = security_path_symlink(path, d, symname); |
1facf9fc | 33009 | + path->dentry = d; |
33010 | + if (unlikely(err)) | |
33011 | + goto out; | |
33012 | + | |
c1595e42 | 33013 | + lockdep_off(); |
1facf9fc | 33014 | + err = vfs_symlink(dir, path->dentry, symname); |
c1595e42 | 33015 | + lockdep_on(); |
1facf9fc | 33016 | + if (!err) { |
33017 | + struct path tmp = *path; | |
33018 | + int did; | |
33019 | + | |
33020 | + vfsub_update_h_iattr(&tmp, &did); | |
33021 | + if (did) { | |
33022 | + tmp.dentry = path->dentry->d_parent; | |
33023 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33024 | + } | |
33025 | + /*ignore*/ | |
33026 | + } | |
33027 | + | |
4f0767ce | 33028 | +out: |
1facf9fc | 33029 | + return err; |
33030 | +} | |
33031 | + | |
33032 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev) | |
33033 | +{ | |
33034 | + int err; | |
33035 | + struct dentry *d; | |
33036 | + | |
33037 | + IMustLock(dir); | |
33038 | + | |
33039 | + d = path->dentry; | |
33040 | + path->dentry = d->d_parent; | |
027c5e7a | 33041 | + err = security_path_mknod(path, d, mode, new_encode_dev(dev)); |
1facf9fc | 33042 | + path->dentry = d; |
33043 | + if (unlikely(err)) | |
33044 | + goto out; | |
33045 | + | |
c1595e42 | 33046 | + lockdep_off(); |
1facf9fc | 33047 | + err = vfs_mknod(dir, path->dentry, mode, dev); |
c1595e42 | 33048 | + lockdep_on(); |
1facf9fc | 33049 | + if (!err) { |
33050 | + struct path tmp = *path; | |
33051 | + int did; | |
33052 | + | |
33053 | + vfsub_update_h_iattr(&tmp, &did); | |
33054 | + if (did) { | |
33055 | + tmp.dentry = path->dentry->d_parent; | |
33056 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33057 | + } | |
33058 | + /*ignore*/ | |
33059 | + } | |
33060 | + | |
4f0767ce | 33061 | +out: |
1facf9fc | 33062 | + return err; |
33063 | +} | |
33064 | + | |
33065 | +static int au_test_nlink(struct inode *inode) | |
33066 | +{ | |
33067 | + const unsigned int link_max = UINT_MAX >> 1; /* rough margin */ | |
33068 | + | |
33069 | + if (!au_test_fs_no_limit_nlink(inode->i_sb) | |
33070 | + || inode->i_nlink < link_max) | |
33071 | + return 0; | |
33072 | + return -EMLINK; | |
33073 | +} | |
33074 | + | |
523b37e3 AM |
33075 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path, |
33076 | + struct inode **delegated_inode) | |
1facf9fc | 33077 | +{ |
33078 | + int err; | |
33079 | + struct dentry *d; | |
33080 | + | |
33081 | + IMustLock(dir); | |
33082 | + | |
5527c038 | 33083 | + err = au_test_nlink(d_inode(src_dentry)); |
1facf9fc | 33084 | + if (unlikely(err)) |
33085 | + return err; | |
33086 | + | |
b4510431 | 33087 | + /* we don't call may_linkat() */ |
1facf9fc | 33088 | + d = path->dentry; |
33089 | + path->dentry = d->d_parent; | |
b752ccd1 | 33090 | + err = security_path_link(src_dentry, path, d); |
1facf9fc | 33091 | + path->dentry = d; |
33092 | + if (unlikely(err)) | |
33093 | + goto out; | |
33094 | + | |
2cbb1c4b | 33095 | + lockdep_off(); |
523b37e3 | 33096 | + err = vfs_link(src_dentry, dir, path->dentry, delegated_inode); |
2cbb1c4b | 33097 | + lockdep_on(); |
1facf9fc | 33098 | + if (!err) { |
33099 | + struct path tmp = *path; | |
33100 | + int did; | |
33101 | + | |
33102 | + /* fuse has different memory inode for the same inumber */ | |
33103 | + vfsub_update_h_iattr(&tmp, &did); | |
33104 | + if (did) { | |
33105 | + tmp.dentry = path->dentry->d_parent; | |
33106 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33107 | + tmp.dentry = src_dentry; | |
33108 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33109 | + } | |
33110 | + /*ignore*/ | |
33111 | + } | |
33112 | + | |
4f0767ce | 33113 | +out: |
1facf9fc | 33114 | + return err; |
33115 | +} | |
33116 | + | |
33117 | +int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry, | |
523b37e3 | 33118 | + struct inode *dir, struct path *path, |
f2c43d5f | 33119 | + struct inode **delegated_inode, unsigned int flags) |
1facf9fc | 33120 | +{ |
33121 | + int err; | |
33122 | + struct path tmp = { | |
33123 | + .mnt = path->mnt | |
33124 | + }; | |
33125 | + struct dentry *d; | |
33126 | + | |
33127 | + IMustLock(dir); | |
33128 | + IMustLock(src_dir); | |
33129 | + | |
33130 | + d = path->dentry; | |
33131 | + path->dentry = d->d_parent; | |
33132 | + tmp.dentry = src_dentry->d_parent; | |
38d290e6 | 33133 | + err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0); |
1facf9fc | 33134 | + path->dentry = d; |
33135 | + if (unlikely(err)) | |
33136 | + goto out; | |
33137 | + | |
2cbb1c4b | 33138 | + lockdep_off(); |
523b37e3 | 33139 | + err = vfs_rename(src_dir, src_dentry, dir, path->dentry, |
f2c43d5f | 33140 | + delegated_inode, flags); |
2cbb1c4b | 33141 | + lockdep_on(); |
1facf9fc | 33142 | + if (!err) { |
33143 | + int did; | |
33144 | + | |
33145 | + tmp.dentry = d->d_parent; | |
33146 | + vfsub_update_h_iattr(&tmp, &did); | |
33147 | + if (did) { | |
33148 | + tmp.dentry = src_dentry; | |
33149 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33150 | + tmp.dentry = src_dentry->d_parent; | |
33151 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33152 | + } | |
33153 | + /*ignore*/ | |
33154 | + } | |
33155 | + | |
4f0767ce | 33156 | +out: |
1facf9fc | 33157 | + return err; |
33158 | +} | |
33159 | + | |
33160 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode) | |
33161 | +{ | |
33162 | + int err; | |
33163 | + struct dentry *d; | |
33164 | + | |
33165 | + IMustLock(dir); | |
33166 | + | |
33167 | + d = path->dentry; | |
33168 | + path->dentry = d->d_parent; | |
b752ccd1 | 33169 | + err = security_path_mkdir(path, d, mode); |
1facf9fc | 33170 | + path->dentry = d; |
33171 | + if (unlikely(err)) | |
33172 | + goto out; | |
33173 | + | |
c1595e42 | 33174 | + lockdep_off(); |
1facf9fc | 33175 | + err = vfs_mkdir(dir, path->dentry, mode); |
c1595e42 | 33176 | + lockdep_on(); |
1facf9fc | 33177 | + if (!err) { |
33178 | + struct path tmp = *path; | |
33179 | + int did; | |
33180 | + | |
33181 | + vfsub_update_h_iattr(&tmp, &did); | |
33182 | + if (did) { | |
33183 | + tmp.dentry = path->dentry->d_parent; | |
33184 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
33185 | + } | |
33186 | + /*ignore*/ | |
33187 | + } | |
33188 | + | |
4f0767ce | 33189 | +out: |
1facf9fc | 33190 | + return err; |
33191 | +} | |
33192 | + | |
33193 | +int vfsub_rmdir(struct inode *dir, struct path *path) | |
33194 | +{ | |
33195 | + int err; | |
33196 | + struct dentry *d; | |
33197 | + | |
33198 | + IMustLock(dir); | |
33199 | + | |
33200 | + d = path->dentry; | |
33201 | + path->dentry = d->d_parent; | |
b752ccd1 | 33202 | + err = security_path_rmdir(path, d); |
1facf9fc | 33203 | + path->dentry = d; |
33204 | + if (unlikely(err)) | |
33205 | + goto out; | |
33206 | + | |
2cbb1c4b | 33207 | + lockdep_off(); |
1facf9fc | 33208 | + err = vfs_rmdir(dir, path->dentry); |
2cbb1c4b | 33209 | + lockdep_on(); |
1facf9fc | 33210 | + if (!err) { |
33211 | + struct path tmp = { | |
33212 | + .dentry = path->dentry->d_parent, | |
33213 | + .mnt = path->mnt | |
33214 | + }; | |
33215 | + | |
33216 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
33217 | + } | |
33218 | + | |
4f0767ce | 33219 | +out: |
1facf9fc | 33220 | + return err; |
33221 | +} | |
33222 | + | |
33223 | +/* ---------------------------------------------------------------------- */ | |
33224 | + | |
9dbd164d | 33225 | +/* todo: support mmap_sem? */ |
1facf9fc | 33226 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, |
33227 | + loff_t *ppos) | |
33228 | +{ | |
33229 | + ssize_t err; | |
33230 | + | |
2cbb1c4b | 33231 | + lockdep_off(); |
1facf9fc | 33232 | + err = vfs_read(file, ubuf, count, ppos); |
2cbb1c4b | 33233 | + lockdep_on(); |
1facf9fc | 33234 | + if (err >= 0) |
33235 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
33236 | + return err; | |
33237 | +} | |
33238 | + | |
33239 | +/* todo: kernel_read()? */ | |
33240 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
33241 | + loff_t *ppos) | |
33242 | +{ | |
33243 | + ssize_t err; | |
33244 | + mm_segment_t oldfs; | |
b752ccd1 AM |
33245 | + union { |
33246 | + void *k; | |
33247 | + char __user *u; | |
33248 | + } buf; | |
1facf9fc | 33249 | + |
b752ccd1 | 33250 | + buf.k = kbuf; |
1facf9fc | 33251 | + oldfs = get_fs(); |
33252 | + set_fs(KERNEL_DS); | |
b752ccd1 | 33253 | + err = vfsub_read_u(file, buf.u, count, ppos); |
1facf9fc | 33254 | + set_fs(oldfs); |
33255 | + return err; | |
33256 | +} | |
33257 | + | |
33258 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
33259 | + loff_t *ppos) | |
33260 | +{ | |
33261 | + ssize_t err; | |
33262 | + | |
2cbb1c4b | 33263 | + lockdep_off(); |
1facf9fc | 33264 | + err = vfs_write(file, ubuf, count, ppos); |
2cbb1c4b | 33265 | + lockdep_on(); |
1facf9fc | 33266 | + if (err >= 0) |
33267 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
33268 | + return err; | |
33269 | +} | |
33270 | + | |
33271 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos) | |
33272 | +{ | |
33273 | + ssize_t err; | |
33274 | + mm_segment_t oldfs; | |
b752ccd1 AM |
33275 | + union { |
33276 | + void *k; | |
33277 | + const char __user *u; | |
33278 | + } buf; | |
1facf9fc | 33279 | + |
b752ccd1 | 33280 | + buf.k = kbuf; |
1facf9fc | 33281 | + oldfs = get_fs(); |
33282 | + set_fs(KERNEL_DS); | |
b752ccd1 | 33283 | + err = vfsub_write_u(file, buf.u, count, ppos); |
1facf9fc | 33284 | + set_fs(oldfs); |
33285 | + return err; | |
33286 | +} | |
33287 | + | |
4a4d8108 AM |
33288 | +int vfsub_flush(struct file *file, fl_owner_t id) |
33289 | +{ | |
33290 | + int err; | |
33291 | + | |
33292 | + err = 0; | |
523b37e3 | 33293 | + if (file->f_op->flush) { |
2000de60 | 33294 | + if (!au_test_nfs(file->f_path.dentry->d_sb)) |
2cbb1c4b JR |
33295 | + err = file->f_op->flush(file, id); |
33296 | + else { | |
33297 | + lockdep_off(); | |
33298 | + err = file->f_op->flush(file, id); | |
33299 | + lockdep_on(); | |
33300 | + } | |
4a4d8108 AM |
33301 | + if (!err) |
33302 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); | |
33303 | + /*ignore*/ | |
33304 | + } | |
33305 | + return err; | |
33306 | +} | |
33307 | + | |
392086de | 33308 | +int vfsub_iterate_dir(struct file *file, struct dir_context *ctx) |
1facf9fc | 33309 | +{ |
33310 | + int err; | |
33311 | + | |
062440b3 | 33312 | + AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); |
392086de | 33313 | + |
2cbb1c4b | 33314 | + lockdep_off(); |
392086de | 33315 | + err = iterate_dir(file, ctx); |
2cbb1c4b | 33316 | + lockdep_on(); |
1facf9fc | 33317 | + if (err >= 0) |
33318 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
1c60b727 | 33319 | + |
1facf9fc | 33320 | + return err; |
33321 | +} | |
33322 | + | |
33323 | +long vfsub_splice_to(struct file *in, loff_t *ppos, | |
33324 | + struct pipe_inode_info *pipe, size_t len, | |
33325 | + unsigned int flags) | |
33326 | +{ | |
33327 | + long err; | |
33328 | + | |
2cbb1c4b | 33329 | + lockdep_off(); |
0fc653ad | 33330 | + err = do_splice_to(in, ppos, pipe, len, flags); |
2cbb1c4b | 33331 | + lockdep_on(); |
4a4d8108 | 33332 | + file_accessed(in); |
1facf9fc | 33333 | + if (err >= 0) |
33334 | + vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/ | |
33335 | + return err; | |
33336 | +} | |
33337 | + | |
33338 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
33339 | + loff_t *ppos, size_t len, unsigned int flags) | |
33340 | +{ | |
33341 | + long err; | |
33342 | + | |
2cbb1c4b | 33343 | + lockdep_off(); |
0fc653ad | 33344 | + err = do_splice_from(pipe, out, ppos, len, flags); |
2cbb1c4b | 33345 | + lockdep_on(); |
1facf9fc | 33346 | + if (err >= 0) |
33347 | + vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/ | |
33348 | + return err; | |
33349 | +} | |
33350 | + | |
53392da6 AM |
33351 | +int vfsub_fsync(struct file *file, struct path *path, int datasync) |
33352 | +{ | |
33353 | + int err; | |
33354 | + | |
33355 | + /* file can be NULL */ | |
33356 | + lockdep_off(); | |
33357 | + err = vfs_fsync(file, datasync); | |
33358 | + lockdep_on(); | |
33359 | + if (!err) { | |
33360 | + if (!path) { | |
33361 | + AuDebugOn(!file); | |
33362 | + path = &file->f_path; | |
33363 | + } | |
33364 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ | |
33365 | + } | |
33366 | + return err; | |
33367 | +} | |
33368 | + | |
1facf9fc | 33369 | +/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */ |
33370 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
33371 | + struct file *h_file) | |
33372 | +{ | |
33373 | + int err; | |
33374 | + struct inode *h_inode; | |
c06a8ce3 | 33375 | + struct super_block *h_sb; |
1facf9fc | 33376 | + |
1facf9fc | 33377 | + if (!h_file) { |
c06a8ce3 AM |
33378 | + err = vfsub_truncate(h_path, length); |
33379 | + goto out; | |
1facf9fc | 33380 | + } |
33381 | + | |
5527c038 | 33382 | + h_inode = d_inode(h_path->dentry); |
c06a8ce3 AM |
33383 | + h_sb = h_inode->i_sb; |
33384 | + lockdep_off(); | |
33385 | + sb_start_write(h_sb); | |
33386 | + lockdep_on(); | |
1facf9fc | 33387 | + err = locks_verify_truncate(h_inode, h_file, length); |
33388 | + if (!err) | |
953406b4 | 33389 | + err = security_path_truncate(h_path); |
2cbb1c4b JR |
33390 | + if (!err) { |
33391 | + lockdep_off(); | |
1facf9fc | 33392 | + err = do_truncate(h_path->dentry, length, attr, h_file); |
2cbb1c4b JR |
33393 | + lockdep_on(); |
33394 | + } | |
c06a8ce3 AM |
33395 | + lockdep_off(); |
33396 | + sb_end_write(h_sb); | |
33397 | + lockdep_on(); | |
1facf9fc | 33398 | + |
4f0767ce | 33399 | +out: |
1facf9fc | 33400 | + return err; |
33401 | +} | |
33402 | + | |
33403 | +/* ---------------------------------------------------------------------- */ | |
33404 | + | |
33405 | +struct au_vfsub_mkdir_args { | |
33406 | + int *errp; | |
33407 | + struct inode *dir; | |
33408 | + struct path *path; | |
33409 | + int mode; | |
33410 | +}; | |
33411 | + | |
33412 | +static void au_call_vfsub_mkdir(void *args) | |
33413 | +{ | |
33414 | + struct au_vfsub_mkdir_args *a = args; | |
33415 | + *a->errp = vfsub_mkdir(a->dir, a->path, a->mode); | |
33416 | +} | |
33417 | + | |
33418 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode) | |
33419 | +{ | |
33420 | + int err, do_sio, wkq_err; | |
33421 | + | |
33422 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
c1595e42 JR |
33423 | + if (!do_sio) { |
33424 | + lockdep_off(); | |
1facf9fc | 33425 | + err = vfsub_mkdir(dir, path, mode); |
c1595e42 JR |
33426 | + lockdep_on(); |
33427 | + } else { | |
1facf9fc | 33428 | + struct au_vfsub_mkdir_args args = { |
33429 | + .errp = &err, | |
33430 | + .dir = dir, | |
33431 | + .path = path, | |
33432 | + .mode = mode | |
33433 | + }; | |
33434 | + wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args); | |
33435 | + if (unlikely(wkq_err)) | |
33436 | + err = wkq_err; | |
33437 | + } | |
33438 | + | |
33439 | + return err; | |
33440 | +} | |
33441 | + | |
33442 | +struct au_vfsub_rmdir_args { | |
33443 | + int *errp; | |
33444 | + struct inode *dir; | |
33445 | + struct path *path; | |
33446 | +}; | |
33447 | + | |
33448 | +static void au_call_vfsub_rmdir(void *args) | |
33449 | +{ | |
33450 | + struct au_vfsub_rmdir_args *a = args; | |
33451 | + *a->errp = vfsub_rmdir(a->dir, a->path); | |
33452 | +} | |
33453 | + | |
33454 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path) | |
33455 | +{ | |
33456 | + int err, do_sio, wkq_err; | |
33457 | + | |
33458 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
c1595e42 JR |
33459 | + if (!do_sio) { |
33460 | + lockdep_off(); | |
1facf9fc | 33461 | + err = vfsub_rmdir(dir, path); |
c1595e42 JR |
33462 | + lockdep_on(); |
33463 | + } else { | |
1facf9fc | 33464 | + struct au_vfsub_rmdir_args args = { |
33465 | + .errp = &err, | |
33466 | + .dir = dir, | |
33467 | + .path = path | |
33468 | + }; | |
33469 | + wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args); | |
33470 | + if (unlikely(wkq_err)) | |
33471 | + err = wkq_err; | |
33472 | + } | |
33473 | + | |
33474 | + return err; | |
33475 | +} | |
33476 | + | |
33477 | +/* ---------------------------------------------------------------------- */ | |
33478 | + | |
33479 | +struct notify_change_args { | |
33480 | + int *errp; | |
33481 | + struct path *path; | |
33482 | + struct iattr *ia; | |
523b37e3 | 33483 | + struct inode **delegated_inode; |
1facf9fc | 33484 | +}; |
33485 | + | |
33486 | +static void call_notify_change(void *args) | |
33487 | +{ | |
33488 | + struct notify_change_args *a = args; | |
33489 | + struct inode *h_inode; | |
33490 | + | |
5527c038 | 33491 | + h_inode = d_inode(a->path->dentry); |
1facf9fc | 33492 | + IMustLock(h_inode); |
33493 | + | |
33494 | + *a->errp = -EPERM; | |
33495 | + if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) { | |
c1595e42 | 33496 | + lockdep_off(); |
523b37e3 AM |
33497 | + *a->errp = notify_change(a->path->dentry, a->ia, |
33498 | + a->delegated_inode); | |
c1595e42 | 33499 | + lockdep_on(); |
1facf9fc | 33500 | + if (!*a->errp) |
33501 | + vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/ | |
33502 | + } | |
33503 | + AuTraceErr(*a->errp); | |
33504 | +} | |
33505 | + | |
523b37e3 AM |
33506 | +int vfsub_notify_change(struct path *path, struct iattr *ia, |
33507 | + struct inode **delegated_inode) | |
1facf9fc | 33508 | +{ |
33509 | + int err; | |
33510 | + struct notify_change_args args = { | |
523b37e3 AM |
33511 | + .errp = &err, |
33512 | + .path = path, | |
33513 | + .ia = ia, | |
33514 | + .delegated_inode = delegated_inode | |
1facf9fc | 33515 | + }; |
33516 | + | |
33517 | + call_notify_change(&args); | |
33518 | + | |
33519 | + return err; | |
33520 | +} | |
33521 | + | |
523b37e3 AM |
33522 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia, |
33523 | + struct inode **delegated_inode) | |
1facf9fc | 33524 | +{ |
33525 | + int err, wkq_err; | |
33526 | + struct notify_change_args args = { | |
523b37e3 AM |
33527 | + .errp = &err, |
33528 | + .path = path, | |
33529 | + .ia = ia, | |
33530 | + .delegated_inode = delegated_inode | |
1facf9fc | 33531 | + }; |
33532 | + | |
33533 | + wkq_err = au_wkq_wait(call_notify_change, &args); | |
33534 | + if (unlikely(wkq_err)) | |
33535 | + err = wkq_err; | |
33536 | + | |
33537 | + return err; | |
33538 | +} | |
33539 | + | |
33540 | +/* ---------------------------------------------------------------------- */ | |
33541 | + | |
33542 | +struct unlink_args { | |
33543 | + int *errp; | |
33544 | + struct inode *dir; | |
33545 | + struct path *path; | |
523b37e3 | 33546 | + struct inode **delegated_inode; |
1facf9fc | 33547 | +}; |
33548 | + | |
33549 | +static void call_unlink(void *args) | |
33550 | +{ | |
33551 | + struct unlink_args *a = args; | |
33552 | + struct dentry *d = a->path->dentry; | |
33553 | + struct inode *h_inode; | |
33554 | + const int stop_sillyrename = (au_test_nfs(d->d_sb) | |
c1595e42 | 33555 | + && au_dcount(d) == 1); |
1facf9fc | 33556 | + |
33557 | + IMustLock(a->dir); | |
33558 | + | |
33559 | + a->path->dentry = d->d_parent; | |
33560 | + *a->errp = security_path_unlink(a->path, d); | |
33561 | + a->path->dentry = d; | |
33562 | + if (unlikely(*a->errp)) | |
33563 | + return; | |
33564 | + | |
33565 | + if (!stop_sillyrename) | |
33566 | + dget(d); | |
5527c038 JR |
33567 | + h_inode = NULL; |
33568 | + if (d_is_positive(d)) { | |
33569 | + h_inode = d_inode(d); | |
027c5e7a | 33570 | + ihold(h_inode); |
5527c038 | 33571 | + } |
1facf9fc | 33572 | + |
2cbb1c4b | 33573 | + lockdep_off(); |
523b37e3 | 33574 | + *a->errp = vfs_unlink(a->dir, d, a->delegated_inode); |
2cbb1c4b | 33575 | + lockdep_on(); |
1facf9fc | 33576 | + if (!*a->errp) { |
33577 | + struct path tmp = { | |
33578 | + .dentry = d->d_parent, | |
33579 | + .mnt = a->path->mnt | |
33580 | + }; | |
33581 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
33582 | + } | |
33583 | + | |
33584 | + if (!stop_sillyrename) | |
33585 | + dput(d); | |
33586 | + if (h_inode) | |
33587 | + iput(h_inode); | |
33588 | + | |
33589 | + AuTraceErr(*a->errp); | |
33590 | +} | |
33591 | + | |
33592 | +/* | |
33593 | + * @dir: must be locked. | |
33594 | + * @dentry: target dentry. | |
33595 | + */ | |
523b37e3 AM |
33596 | +int vfsub_unlink(struct inode *dir, struct path *path, |
33597 | + struct inode **delegated_inode, int force) | |
1facf9fc | 33598 | +{ |
33599 | + int err; | |
33600 | + struct unlink_args args = { | |
523b37e3 AM |
33601 | + .errp = &err, |
33602 | + .dir = dir, | |
33603 | + .path = path, | |
33604 | + .delegated_inode = delegated_inode | |
1facf9fc | 33605 | + }; |
33606 | + | |
33607 | + if (!force) | |
33608 | + call_unlink(&args); | |
33609 | + else { | |
33610 | + int wkq_err; | |
33611 | + | |
33612 | + wkq_err = au_wkq_wait(call_unlink, &args); | |
33613 | + if (unlikely(wkq_err)) | |
33614 | + err = wkq_err; | |
33615 | + } | |
33616 | + | |
33617 | + return err; | |
33618 | +} | |
7f207e10 | 33619 | diff -urN /usr/share/empty/fs/aufs/vfsub.h linux/fs/aufs/vfsub.h |
eca34b5c | 33620 | --- /usr/share/empty/fs/aufs/vfsub.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 33621 | +++ linux/fs/aufs/vfsub.h 2020-01-27 10:57:18.178871751 +0100 |
eca801bf | 33622 | @@ -0,0 +1,354 @@ |
062440b3 | 33623 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 33624 | +/* |
016522bc | 33625 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 33626 | + * |
33627 | + * This program, aufs is free software; you can redistribute it and/or modify | |
33628 | + * it under the terms of the GNU General Public License as published by | |
33629 | + * the Free Software Foundation; either version 2 of the License, or | |
33630 | + * (at your option) any later version. | |
dece6358 AM |
33631 | + * |
33632 | + * This program is distributed in the hope that it will be useful, | |
33633 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
33634 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
33635 | + * GNU General Public License for more details. | |
33636 | + * | |
33637 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 33638 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 33639 | + */ |
33640 | + | |
33641 | +/* | |
33642 | + * sub-routines for VFS | |
33643 | + */ | |
33644 | + | |
33645 | +#ifndef __AUFS_VFSUB_H__ | |
33646 | +#define __AUFS_VFSUB_H__ | |
33647 | + | |
33648 | +#ifdef __KERNEL__ | |
33649 | + | |
33650 | +#include <linux/fs.h> | |
b4510431 | 33651 | +#include <linux/mount.h> |
8cdd5066 | 33652 | +#include <linux/posix_acl.h> |
c1595e42 | 33653 | +#include <linux/xattr.h> |
7f207e10 | 33654 | +#include "debug.h" |
1facf9fc | 33655 | + |
7f207e10 | 33656 | +/* copied from linux/fs/internal.h */ |
2cbb1c4b | 33657 | +/* todo: BAD approach!! */ |
c06a8ce3 | 33658 | +extern void __mnt_drop_write(struct vfsmount *); |
acd2b654 | 33659 | +extern struct file *alloc_empty_file(int, const struct cred *); |
7f207e10 AM |
33660 | + |
33661 | +/* ---------------------------------------------------------------------- */ | |
1facf9fc | 33662 | + |
33663 | +/* lock subclass for lower inode */ | |
33664 | +/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */ | |
33665 | +/* reduce? gave up. */ | |
33666 | +enum { | |
c1595e42 | 33667 | + AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */ |
1facf9fc | 33668 | + AuLsc_I_PARENT, /* lower inode, parent first */ |
33669 | + AuLsc_I_PARENT2, /* copyup dirs */ | |
dece6358 | 33670 | + AuLsc_I_PARENT3, /* copyup wh */ |
1facf9fc | 33671 | + AuLsc_I_CHILD, |
33672 | + AuLsc_I_CHILD2, | |
33673 | + AuLsc_I_End | |
33674 | +}; | |
33675 | + | |
33676 | +/* to debug easier, do not make them inlined functions */ | |
33677 | +#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx)) | |
febd17d6 | 33678 | +#define IMustLock(i) AuDebugOn(!inode_is_locked(i)) |
1facf9fc | 33679 | + |
33680 | +/* ---------------------------------------------------------------------- */ | |
33681 | + | |
7f207e10 AM |
33682 | +static inline void vfsub_drop_nlink(struct inode *inode) |
33683 | +{ | |
33684 | + AuDebugOn(!inode->i_nlink); | |
33685 | + drop_nlink(inode); | |
33686 | +} | |
33687 | + | |
027c5e7a AM |
33688 | +static inline void vfsub_dead_dir(struct inode *inode) |
33689 | +{ | |
33690 | + AuDebugOn(!S_ISDIR(inode->i_mode)); | |
33691 | + inode->i_flags |= S_DEAD; | |
33692 | + clear_nlink(inode); | |
33693 | +} | |
33694 | + | |
392086de AM |
33695 | +static inline int vfsub_native_ro(struct inode *inode) |
33696 | +{ | |
8b6a4947 | 33697 | + return sb_rdonly(inode->i_sb) |
392086de AM |
33698 | + || IS_RDONLY(inode) |
33699 | + /* || IS_APPEND(inode) */ | |
33700 | + || IS_IMMUTABLE(inode); | |
33701 | +} | |
33702 | + | |
8cdd5066 JR |
33703 | +#ifdef CONFIG_AUFS_BR_FUSE |
33704 | +int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb); | |
33705 | +#else | |
33706 | +AuStubInt0(vfsub_test_mntns, struct vfsmount *mnt, struct super_block *h_sb); | |
33707 | +#endif | |
33708 | + | |
a2654f78 AM |
33709 | +int vfsub_sync_filesystem(struct super_block *h_sb, int wait); |
33710 | + | |
7f207e10 AM |
33711 | +/* ---------------------------------------------------------------------- */ |
33712 | + | |
33713 | +int vfsub_update_h_iattr(struct path *h_path, int *did); | |
33714 | +struct file *vfsub_dentry_open(struct path *path, int flags); | |
33715 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode); | |
acd2b654 | 33716 | +struct au_branch; |
b912730e | 33717 | +struct vfsub_aopen_args { |
acd2b654 AM |
33718 | + struct file *file; |
33719 | + unsigned int open_flag; | |
33720 | + umode_t create_mode; | |
33721 | + struct au_branch *br; | |
b912730e | 33722 | +}; |
b912730e | 33723 | +int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, |
acd2b654 | 33724 | + struct vfsub_aopen_args *args); |
1facf9fc | 33725 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path); |
b4510431 | 33726 | + |
febd17d6 JR |
33727 | +struct dentry *vfsub_lookup_one_len_unlocked(const char *name, |
33728 | + struct dentry *parent, int len); | |
1facf9fc | 33729 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, |
33730 | + int len); | |
b4510431 AM |
33731 | + |
33732 | +struct vfsub_lkup_one_args { | |
33733 | + struct dentry **errp; | |
33734 | + struct qstr *name; | |
33735 | + struct dentry *parent; | |
33736 | +}; | |
33737 | + | |
33738 | +static inline struct dentry *vfsub_lkup_one(struct qstr *name, | |
33739 | + struct dentry *parent) | |
33740 | +{ | |
33741 | + return vfsub_lookup_one_len(name->name, parent, name->len); | |
33742 | +} | |
33743 | + | |
33744 | +void vfsub_call_lkup_one(void *args); | |
33745 | + | |
33746 | +/* ---------------------------------------------------------------------- */ | |
33747 | + | |
33748 | +static inline int vfsub_mnt_want_write(struct vfsmount *mnt) | |
33749 | +{ | |
33750 | + int err; | |
076b876e | 33751 | + |
b4510431 AM |
33752 | + lockdep_off(); |
33753 | + err = mnt_want_write(mnt); | |
33754 | + lockdep_on(); | |
33755 | + return err; | |
33756 | +} | |
33757 | + | |
33758 | +static inline void vfsub_mnt_drop_write(struct vfsmount *mnt) | |
33759 | +{ | |
33760 | + lockdep_off(); | |
33761 | + mnt_drop_write(mnt); | |
33762 | + lockdep_on(); | |
33763 | +} | |
1facf9fc | 33764 | + |
7e9cd9fe | 33765 | +#if 0 /* reserved */ |
c06a8ce3 AM |
33766 | +static inline void vfsub_mnt_drop_write_file(struct file *file) |
33767 | +{ | |
33768 | + lockdep_off(); | |
33769 | + mnt_drop_write_file(file); | |
33770 | + lockdep_on(); | |
33771 | +} | |
7e9cd9fe | 33772 | +#endif |
c06a8ce3 | 33773 | + |
1facf9fc | 33774 | +/* ---------------------------------------------------------------------- */ |
33775 | + | |
33776 | +struct au_hinode; | |
33777 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
33778 | + struct dentry *d2, struct au_hinode *hdir2); | |
33779 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
33780 | + struct dentry *d2, struct au_hinode *hdir2); | |
33781 | + | |
537831f9 AM |
33782 | +int vfsub_create(struct inode *dir, struct path *path, int mode, |
33783 | + bool want_excl); | |
1facf9fc | 33784 | +int vfsub_symlink(struct inode *dir, struct path *path, |
33785 | + const char *symname); | |
33786 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev); | |
33787 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, | |
523b37e3 | 33788 | + struct path *path, struct inode **delegated_inode); |
1facf9fc | 33789 | +int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry, |
523b37e3 | 33790 | + struct inode *hdir, struct path *path, |
f2c43d5f | 33791 | + struct inode **delegated_inode, unsigned int flags); |
1facf9fc | 33792 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode); |
33793 | +int vfsub_rmdir(struct inode *dir, struct path *path); | |
33794 | + | |
33795 | +/* ---------------------------------------------------------------------- */ | |
33796 | + | |
33797 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
33798 | + loff_t *ppos); | |
33799 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
33800 | + loff_t *ppos); | |
33801 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
33802 | + loff_t *ppos); | |
33803 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, | |
33804 | + loff_t *ppos); | |
4a4d8108 | 33805 | +int vfsub_flush(struct file *file, fl_owner_t id); |
392086de AM |
33806 | +int vfsub_iterate_dir(struct file *file, struct dir_context *ctx); |
33807 | + | |
c06a8ce3 AM |
33808 | +static inline loff_t vfsub_f_size_read(struct file *file) |
33809 | +{ | |
33810 | + return i_size_read(file_inode(file)); | |
33811 | +} | |
33812 | + | |
4a4d8108 AM |
33813 | +static inline unsigned int vfsub_file_flags(struct file *file) |
33814 | +{ | |
33815 | + unsigned int flags; | |
33816 | + | |
33817 | + spin_lock(&file->f_lock); | |
33818 | + flags = file->f_flags; | |
33819 | + spin_unlock(&file->f_lock); | |
33820 | + | |
33821 | + return flags; | |
33822 | +} | |
1308ab2a | 33823 | + |
f0c0a007 AM |
33824 | +static inline int vfsub_file_execed(struct file *file) |
33825 | +{ | |
33826 | + /* todo: direct access f_flags */ | |
33827 | + return !!(vfsub_file_flags(file) & __FMODE_EXEC); | |
33828 | +} | |
33829 | + | |
7e9cd9fe | 33830 | +#if 0 /* reserved */ |
1facf9fc | 33831 | +static inline void vfsub_file_accessed(struct file *h_file) |
33832 | +{ | |
33833 | + file_accessed(h_file); | |
33834 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/ | |
33835 | +} | |
7e9cd9fe | 33836 | +#endif |
1facf9fc | 33837 | + |
79b8bda9 | 33838 | +#if 0 /* reserved */ |
1facf9fc | 33839 | +static inline void vfsub_touch_atime(struct vfsmount *h_mnt, |
33840 | + struct dentry *h_dentry) | |
33841 | +{ | |
33842 | + struct path h_path = { | |
33843 | + .dentry = h_dentry, | |
33844 | + .mnt = h_mnt | |
33845 | + }; | |
92d182d2 | 33846 | + touch_atime(&h_path); |
1facf9fc | 33847 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ |
33848 | +} | |
79b8bda9 | 33849 | +#endif |
1facf9fc | 33850 | + |
cd7a4cd9 AM |
33851 | +static inline int vfsub_update_time(struct inode *h_inode, |
33852 | + struct timespec64 *ts, int flags) | |
0c3ec466 | 33853 | +{ |
5afbbe0d | 33854 | + return update_time(h_inode, ts, flags); |
0c3ec466 AM |
33855 | + /* no vfsub_update_h_iattr() since we don't have struct path */ |
33856 | +} | |
33857 | + | |
8cdd5066 JR |
33858 | +#ifdef CONFIG_FS_POSIX_ACL |
33859 | +static inline int vfsub_acl_chmod(struct inode *h_inode, umode_t h_mode) | |
33860 | +{ | |
33861 | + int err; | |
33862 | + | |
33863 | + err = posix_acl_chmod(h_inode, h_mode); | |
33864 | + if (err == -EOPNOTSUPP) | |
33865 | + err = 0; | |
33866 | + return err; | |
33867 | +} | |
33868 | +#else | |
33869 | +AuStubInt0(vfsub_acl_chmod, struct inode *h_inode, umode_t h_mode); | |
33870 | +#endif | |
33871 | + | |
4a4d8108 AM |
33872 | +long vfsub_splice_to(struct file *in, loff_t *ppos, |
33873 | + struct pipe_inode_info *pipe, size_t len, | |
33874 | + unsigned int flags); | |
33875 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
33876 | + loff_t *ppos, size_t len, unsigned int flags); | |
c06a8ce3 AM |
33877 | + |
33878 | +static inline long vfsub_truncate(struct path *path, loff_t length) | |
33879 | +{ | |
33880 | + long err; | |
076b876e | 33881 | + |
c06a8ce3 AM |
33882 | + lockdep_off(); |
33883 | + err = vfs_truncate(path, length); | |
33884 | + lockdep_on(); | |
33885 | + return err; | |
33886 | +} | |
33887 | + | |
4a4d8108 AM |
33888 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, |
33889 | + struct file *h_file); | |
53392da6 | 33890 | +int vfsub_fsync(struct file *file, struct path *path, int datasync); |
4a4d8108 | 33891 | + |
521ced18 JR |
33892 | +/* |
33893 | + * re-use branch fs's ioctl(FICLONE) while aufs itself doesn't support such | |
33894 | + * ioctl. | |
33895 | + */ | |
9f237c51 AM |
33896 | +static inline loff_t vfsub_clone_file_range(struct file *src, struct file *dst, |
33897 | + loff_t len) | |
521ced18 | 33898 | +{ |
9f237c51 | 33899 | + loff_t err; |
521ced18 JR |
33900 | + |
33901 | + lockdep_off(); | |
9f237c51 | 33902 | + err = vfs_clone_file_range(src, 0, dst, 0, len, /*remap_flags*/0); |
521ced18 JR |
33903 | + lockdep_on(); |
33904 | + | |
33905 | + return err; | |
33906 | +} | |
33907 | + | |
33908 | +/* copy_file_range(2) is a systemcall */ | |
33909 | +static inline ssize_t vfsub_copy_file_range(struct file *src, loff_t src_pos, | |
33910 | + struct file *dst, loff_t dst_pos, | |
33911 | + size_t len, unsigned int flags) | |
33912 | +{ | |
33913 | + ssize_t ssz; | |
33914 | + | |
33915 | + lockdep_off(); | |
33916 | + ssz = vfs_copy_file_range(src, src_pos, dst, dst_pos, len, flags); | |
33917 | + lockdep_on(); | |
33918 | + | |
33919 | + return ssz; | |
33920 | +} | |
33921 | + | |
1facf9fc | 33922 | +/* ---------------------------------------------------------------------- */ |
33923 | + | |
33924 | +static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin) | |
33925 | +{ | |
33926 | + loff_t err; | |
33927 | + | |
2cbb1c4b | 33928 | + lockdep_off(); |
1facf9fc | 33929 | + err = vfs_llseek(file, offset, origin); |
2cbb1c4b | 33930 | + lockdep_on(); |
1facf9fc | 33931 | + return err; |
33932 | +} | |
33933 | + | |
33934 | +/* ---------------------------------------------------------------------- */ | |
33935 | + | |
4a4d8108 AM |
33936 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode); |
33937 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path); | |
523b37e3 AM |
33938 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia, |
33939 | + struct inode **delegated_inode); | |
33940 | +int vfsub_notify_change(struct path *path, struct iattr *ia, | |
33941 | + struct inode **delegated_inode); | |
33942 | +int vfsub_unlink(struct inode *dir, struct path *path, | |
33943 | + struct inode **delegated_inode, int force); | |
4a4d8108 | 33944 | + |
521ced18 JR |
33945 | +static inline int vfsub_getattr(const struct path *path, struct kstat *st) |
33946 | +{ | |
33947 | + return vfs_getattr(path, st, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
33948 | +} | |
33949 | + | |
c1595e42 JR |
33950 | +/* ---------------------------------------------------------------------- */ |
33951 | + | |
33952 | +static inline int vfsub_setxattr(struct dentry *dentry, const char *name, | |
33953 | + const void *value, size_t size, int flags) | |
33954 | +{ | |
33955 | + int err; | |
33956 | + | |
33957 | + lockdep_off(); | |
33958 | + err = vfs_setxattr(dentry, name, value, size, flags); | |
33959 | + lockdep_on(); | |
33960 | + | |
33961 | + return err; | |
33962 | +} | |
33963 | + | |
33964 | +static inline int vfsub_removexattr(struct dentry *dentry, const char *name) | |
33965 | +{ | |
33966 | + int err; | |
33967 | + | |
33968 | + lockdep_off(); | |
33969 | + err = vfs_removexattr(dentry, name); | |
33970 | + lockdep_on(); | |
33971 | + | |
33972 | + return err; | |
33973 | +} | |
33974 | + | |
1facf9fc | 33975 | +#endif /* __KERNEL__ */ |
33976 | +#endif /* __AUFS_VFSUB_H__ */ | |
7f207e10 | 33977 | diff -urN /usr/share/empty/fs/aufs/wbr_policy.c linux/fs/aufs/wbr_policy.c |
eca34b5c | 33978 | --- /usr/share/empty/fs/aufs/wbr_policy.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 33979 | +++ linux/fs/aufs/wbr_policy.c 2020-01-27 10:57:18.178871751 +0100 |
cd7a4cd9 AM |
33980 | @@ -0,0 +1,830 @@ |
33981 | +// SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 33982 | +/* |
016522bc | 33983 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 33984 | + * |
33985 | + * This program, aufs is free software; you can redistribute it and/or modify | |
33986 | + * it under the terms of the GNU General Public License as published by | |
33987 | + * the Free Software Foundation; either version 2 of the License, or | |
33988 | + * (at your option) any later version. | |
dece6358 AM |
33989 | + * |
33990 | + * This program is distributed in the hope that it will be useful, | |
33991 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
33992 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
33993 | + * GNU General Public License for more details. | |
33994 | + * | |
33995 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 33996 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 33997 | + */ |
33998 | + | |
33999 | +/* | |
34000 | + * policies for selecting one among multiple writable branches | |
34001 | + */ | |
34002 | + | |
34003 | +#include <linux/statfs.h> | |
34004 | +#include "aufs.h" | |
34005 | + | |
34006 | +/* subset of cpup_attr() */ | |
34007 | +static noinline_for_stack | |
34008 | +int au_cpdown_attr(struct path *h_path, struct dentry *h_src) | |
34009 | +{ | |
34010 | + int err, sbits; | |
34011 | + struct iattr ia; | |
34012 | + struct inode *h_isrc; | |
34013 | + | |
5527c038 | 34014 | + h_isrc = d_inode(h_src); |
1facf9fc | 34015 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID; |
34016 | + ia.ia_mode = h_isrc->i_mode; | |
34017 | + ia.ia_uid = h_isrc->i_uid; | |
34018 | + ia.ia_gid = h_isrc->i_gid; | |
34019 | + sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID)); | |
5527c038 | 34020 | + au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags); |
523b37e3 AM |
34021 | + /* no delegation since it is just created */ |
34022 | + err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); | |
1facf9fc | 34023 | + |
34024 | + /* is this nfs only? */ | |
34025 | + if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) { | |
34026 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
34027 | + ia.ia_mode = h_isrc->i_mode; | |
523b37e3 | 34028 | + err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); |
1facf9fc | 34029 | + } |
34030 | + | |
34031 | + return err; | |
34032 | +} | |
34033 | + | |
34034 | +#define AuCpdown_PARENT_OPQ 1 | |
34035 | +#define AuCpdown_WHED (1 << 1) | |
34036 | +#define AuCpdown_MADE_DIR (1 << 2) | |
34037 | +#define AuCpdown_DIROPQ (1 << 3) | |
34038 | +#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name) | |
7f207e10 AM |
34039 | +#define au_fset_cpdown(flags, name) \ |
34040 | + do { (flags) |= AuCpdown_##name; } while (0) | |
34041 | +#define au_fclr_cpdown(flags, name) \ | |
34042 | + do { (flags) &= ~AuCpdown_##name; } while (0) | |
1facf9fc | 34043 | + |
1facf9fc | 34044 | +static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst, |
c2b27bf2 | 34045 | + unsigned int *flags) |
1facf9fc | 34046 | +{ |
34047 | + int err; | |
34048 | + struct dentry *opq_dentry; | |
34049 | + | |
34050 | + opq_dentry = au_diropq_create(dentry, bdst); | |
34051 | + err = PTR_ERR(opq_dentry); | |
34052 | + if (IS_ERR(opq_dentry)) | |
34053 | + goto out; | |
34054 | + dput(opq_dentry); | |
c2b27bf2 | 34055 | + au_fset_cpdown(*flags, DIROPQ); |
1facf9fc | 34056 | + |
4f0767ce | 34057 | +out: |
1facf9fc | 34058 | + return err; |
34059 | +} | |
34060 | + | |
34061 | +static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent, | |
34062 | + struct inode *dir, aufs_bindex_t bdst) | |
34063 | +{ | |
34064 | + int err; | |
34065 | + struct path h_path; | |
34066 | + struct au_branch *br; | |
34067 | + | |
34068 | + br = au_sbr(dentry->d_sb, bdst); | |
34069 | + h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
34070 | + err = PTR_ERR(h_path.dentry); | |
34071 | + if (IS_ERR(h_path.dentry)) | |
34072 | + goto out; | |
34073 | + | |
34074 | + err = 0; | |
5527c038 | 34075 | + if (d_is_positive(h_path.dentry)) { |
86dc4139 | 34076 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 34077 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path, |
34078 | + dentry); | |
34079 | + } | |
34080 | + dput(h_path.dentry); | |
34081 | + | |
4f0767ce | 34082 | +out: |
1facf9fc | 34083 | + return err; |
34084 | +} | |
34085 | + | |
34086 | +static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 34087 | + struct au_pin *pin, |
1facf9fc | 34088 | + struct dentry *h_parent, void *arg) |
34089 | +{ | |
34090 | + int err, rerr; | |
5afbbe0d | 34091 | + aufs_bindex_t bopq, btop; |
1facf9fc | 34092 | + struct path h_path; |
34093 | + struct dentry *parent; | |
34094 | + struct inode *h_dir, *h_inode, *inode, *dir; | |
c2b27bf2 | 34095 | + unsigned int *flags = arg; |
1facf9fc | 34096 | + |
5afbbe0d | 34097 | + btop = au_dbtop(dentry); |
1facf9fc | 34098 | + /* dentry is di-locked */ |
34099 | + parent = dget_parent(dentry); | |
5527c038 JR |
34100 | + dir = d_inode(parent); |
34101 | + h_dir = d_inode(h_parent); | |
1facf9fc | 34102 | + AuDebugOn(h_dir != au_h_iptr(dir, bdst)); |
34103 | + IMustLock(h_dir); | |
34104 | + | |
86dc4139 | 34105 | + err = au_lkup_neg(dentry, bdst, /*wh*/0); |
1facf9fc | 34106 | + if (unlikely(err < 0)) |
34107 | + goto out; | |
34108 | + h_path.dentry = au_h_dptr(dentry, bdst); | |
34109 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst); | |
cd7a4cd9 | 34110 | + err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path, 0755); |
1facf9fc | 34111 | + if (unlikely(err)) |
34112 | + goto out_put; | |
c2b27bf2 | 34113 | + au_fset_cpdown(*flags, MADE_DIR); |
1facf9fc | 34114 | + |
1facf9fc | 34115 | + bopq = au_dbdiropq(dentry); |
c2b27bf2 AM |
34116 | + au_fclr_cpdown(*flags, WHED); |
34117 | + au_fclr_cpdown(*flags, DIROPQ); | |
1facf9fc | 34118 | + if (au_dbwh(dentry) == bdst) |
c2b27bf2 AM |
34119 | + au_fset_cpdown(*flags, WHED); |
34120 | + if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst) | |
34121 | + au_fset_cpdown(*flags, PARENT_OPQ); | |
5527c038 | 34122 | + h_inode = d_inode(h_path.dentry); |
febd17d6 | 34123 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
c2b27bf2 AM |
34124 | + if (au_ftest_cpdown(*flags, WHED)) { |
34125 | + err = au_cpdown_dir_opq(dentry, bdst, flags); | |
1facf9fc | 34126 | + if (unlikely(err)) { |
febd17d6 | 34127 | + inode_unlock(h_inode); |
1facf9fc | 34128 | + goto out_dir; |
34129 | + } | |
34130 | + } | |
34131 | + | |
5afbbe0d | 34132 | + err = au_cpdown_attr(&h_path, au_h_dptr(dentry, btop)); |
febd17d6 | 34133 | + inode_unlock(h_inode); |
1facf9fc | 34134 | + if (unlikely(err)) |
34135 | + goto out_opq; | |
34136 | + | |
c2b27bf2 | 34137 | + if (au_ftest_cpdown(*flags, WHED)) { |
1facf9fc | 34138 | + err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst); |
34139 | + if (unlikely(err)) | |
34140 | + goto out_opq; | |
34141 | + } | |
34142 | + | |
5527c038 | 34143 | + inode = d_inode(dentry); |
5afbbe0d AM |
34144 | + if (au_ibbot(inode) < bdst) |
34145 | + au_set_ibbot(inode, bdst); | |
1facf9fc | 34146 | + au_set_h_iptr(inode, bdst, au_igrab(h_inode), |
34147 | + au_hi_flags(inode, /*isdir*/1)); | |
076b876e | 34148 | + au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0); |
1facf9fc | 34149 | + goto out; /* success */ |
34150 | + | |
34151 | + /* revert */ | |
4f0767ce | 34152 | +out_opq: |
c2b27bf2 | 34153 | + if (au_ftest_cpdown(*flags, DIROPQ)) { |
febd17d6 | 34154 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
1facf9fc | 34155 | + rerr = au_diropq_remove(dentry, bdst); |
febd17d6 | 34156 | + inode_unlock(h_inode); |
1facf9fc | 34157 | + if (unlikely(rerr)) { |
523b37e3 AM |
34158 | + AuIOErr("failed removing diropq for %pd b%d (%d)\n", |
34159 | + dentry, bdst, rerr); | |
1facf9fc | 34160 | + err = -EIO; |
34161 | + goto out; | |
34162 | + } | |
34163 | + } | |
4f0767ce | 34164 | +out_dir: |
c2b27bf2 | 34165 | + if (au_ftest_cpdown(*flags, MADE_DIR)) { |
1facf9fc | 34166 | + rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path); |
34167 | + if (unlikely(rerr)) { | |
523b37e3 AM |
34168 | + AuIOErr("failed removing %pd b%d (%d)\n", |
34169 | + dentry, bdst, rerr); | |
1facf9fc | 34170 | + err = -EIO; |
34171 | + } | |
34172 | + } | |
4f0767ce | 34173 | +out_put: |
1facf9fc | 34174 | + au_set_h_dptr(dentry, bdst, NULL); |
5afbbe0d AM |
34175 | + if (au_dbbot(dentry) == bdst) |
34176 | + au_update_dbbot(dentry); | |
4f0767ce | 34177 | +out: |
1facf9fc | 34178 | + dput(parent); |
34179 | + return err; | |
34180 | +} | |
34181 | + | |
34182 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
34183 | +{ | |
34184 | + int err; | |
c2b27bf2 | 34185 | + unsigned int flags; |
1facf9fc | 34186 | + |
c2b27bf2 AM |
34187 | + flags = 0; |
34188 | + err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags); | |
1facf9fc | 34189 | + |
34190 | + return err; | |
34191 | +} | |
34192 | + | |
34193 | +/* ---------------------------------------------------------------------- */ | |
34194 | + | |
34195 | +/* policies for create */ | |
34196 | + | |
c2b27bf2 | 34197 | +int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex) |
4a4d8108 AM |
34198 | +{ |
34199 | + int err, i, j, ndentry; | |
34200 | + aufs_bindex_t bopq; | |
34201 | + struct au_dcsub_pages dpages; | |
34202 | + struct au_dpage *dpage; | |
34203 | + struct dentry **dentries, *parent, *d; | |
34204 | + | |
34205 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
34206 | + if (unlikely(err)) | |
34207 | + goto out; | |
34208 | + parent = dget_parent(dentry); | |
027c5e7a | 34209 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0); |
4a4d8108 AM |
34210 | + if (unlikely(err)) |
34211 | + goto out_free; | |
34212 | + | |
34213 | + err = bindex; | |
34214 | + for (i = 0; i < dpages.ndpage; i++) { | |
34215 | + dpage = dpages.dpages + i; | |
34216 | + dentries = dpage->dentries; | |
34217 | + ndentry = dpage->ndentry; | |
34218 | + for (j = 0; j < ndentry; j++) { | |
34219 | + d = dentries[j]; | |
34220 | + di_read_lock_parent2(d, !AuLock_IR); | |
34221 | + bopq = au_dbdiropq(d); | |
34222 | + di_read_unlock(d, !AuLock_IR); | |
34223 | + if (bopq >= 0 && bopq < err) | |
34224 | + err = bopq; | |
34225 | + } | |
34226 | + } | |
34227 | + | |
34228 | +out_free: | |
34229 | + dput(parent); | |
34230 | + au_dpages_free(&dpages); | |
34231 | +out: | |
34232 | + return err; | |
34233 | +} | |
34234 | + | |
1facf9fc | 34235 | +static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex) |
34236 | +{ | |
34237 | + for (; bindex >= 0; bindex--) | |
34238 | + if (!au_br_rdonly(au_sbr(sb, bindex))) | |
34239 | + return bindex; | |
34240 | + return -EROFS; | |
34241 | +} | |
34242 | + | |
34243 | +/* top down parent */ | |
392086de AM |
34244 | +static int au_wbr_create_tdp(struct dentry *dentry, |
34245 | + unsigned int flags __maybe_unused) | |
1facf9fc | 34246 | +{ |
34247 | + int err; | |
5afbbe0d | 34248 | + aufs_bindex_t btop, bindex; |
1facf9fc | 34249 | + struct super_block *sb; |
34250 | + struct dentry *parent, *h_parent; | |
34251 | + | |
34252 | + sb = dentry->d_sb; | |
5afbbe0d AM |
34253 | + btop = au_dbtop(dentry); |
34254 | + err = btop; | |
34255 | + if (!au_br_rdonly(au_sbr(sb, btop))) | |
1facf9fc | 34256 | + goto out; |
34257 | + | |
34258 | + err = -EROFS; | |
34259 | + parent = dget_parent(dentry); | |
5afbbe0d | 34260 | + for (bindex = au_dbtop(parent); bindex < btop; bindex++) { |
1facf9fc | 34261 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34262 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34263 | + continue; |
34264 | + | |
34265 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
34266 | + err = bindex; | |
34267 | + break; | |
34268 | + } | |
34269 | + } | |
34270 | + dput(parent); | |
34271 | + | |
34272 | + /* bottom up here */ | |
4a4d8108 | 34273 | + if (unlikely(err < 0)) { |
5afbbe0d | 34274 | + err = au_wbr_bu(sb, btop - 1); |
4a4d8108 AM |
34275 | + if (err >= 0) |
34276 | + err = au_wbr_nonopq(dentry, err); | |
34277 | + } | |
1facf9fc | 34278 | + |
4f0767ce | 34279 | +out: |
1facf9fc | 34280 | + AuDbg("b%d\n", err); |
34281 | + return err; | |
34282 | +} | |
34283 | + | |
34284 | +/* ---------------------------------------------------------------------- */ | |
34285 | + | |
34286 | +/* an exception for the policy other than tdp */ | |
34287 | +static int au_wbr_create_exp(struct dentry *dentry) | |
34288 | +{ | |
34289 | + int err; | |
34290 | + aufs_bindex_t bwh, bdiropq; | |
34291 | + struct dentry *parent; | |
34292 | + | |
34293 | + err = -1; | |
34294 | + bwh = au_dbwh(dentry); | |
34295 | + parent = dget_parent(dentry); | |
34296 | + bdiropq = au_dbdiropq(parent); | |
34297 | + if (bwh >= 0) { | |
34298 | + if (bdiropq >= 0) | |
34299 | + err = min(bdiropq, bwh); | |
34300 | + else | |
34301 | + err = bwh; | |
34302 | + AuDbg("%d\n", err); | |
34303 | + } else if (bdiropq >= 0) { | |
34304 | + err = bdiropq; | |
34305 | + AuDbg("%d\n", err); | |
34306 | + } | |
34307 | + dput(parent); | |
34308 | + | |
4a4d8108 AM |
34309 | + if (err >= 0) |
34310 | + err = au_wbr_nonopq(dentry, err); | |
34311 | + | |
1facf9fc | 34312 | + if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err))) |
34313 | + err = -1; | |
34314 | + | |
34315 | + AuDbg("%d\n", err); | |
34316 | + return err; | |
34317 | +} | |
34318 | + | |
34319 | +/* ---------------------------------------------------------------------- */ | |
34320 | + | |
34321 | +/* round robin */ | |
34322 | +static int au_wbr_create_init_rr(struct super_block *sb) | |
34323 | +{ | |
34324 | + int err; | |
34325 | + | |
5afbbe0d | 34326 | + err = au_wbr_bu(sb, au_sbbot(sb)); |
1facf9fc | 34327 | + atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */ |
dece6358 | 34328 | + /* smp_mb(); */ |
1facf9fc | 34329 | + |
34330 | + AuDbg("b%d\n", err); | |
34331 | + return err; | |
34332 | +} | |
34333 | + | |
392086de | 34334 | +static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34335 | +{ |
34336 | + int err, nbr; | |
34337 | + unsigned int u; | |
5afbbe0d | 34338 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 34339 | + struct super_block *sb; |
34340 | + atomic_t *next; | |
34341 | + | |
34342 | + err = au_wbr_create_exp(dentry); | |
34343 | + if (err >= 0) | |
34344 | + goto out; | |
34345 | + | |
34346 | + sb = dentry->d_sb; | |
34347 | + next = &au_sbi(sb)->si_wbr_rr_next; | |
5afbbe0d AM |
34348 | + bbot = au_sbbot(sb); |
34349 | + nbr = bbot + 1; | |
34350 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
392086de | 34351 | + if (!au_ftest_wbr(flags, DIR)) { |
1facf9fc | 34352 | + err = atomic_dec_return(next) + 1; |
34353 | + /* modulo for 0 is meaningless */ | |
34354 | + if (unlikely(!err)) | |
34355 | + err = atomic_dec_return(next) + 1; | |
34356 | + } else | |
34357 | + err = atomic_read(next); | |
34358 | + AuDbg("%d\n", err); | |
34359 | + u = err; | |
34360 | + err = u % nbr; | |
34361 | + AuDbg("%d\n", err); | |
34362 | + if (!au_br_rdonly(au_sbr(sb, err))) | |
34363 | + break; | |
34364 | + err = -EROFS; | |
34365 | + } | |
34366 | + | |
4a4d8108 AM |
34367 | + if (err >= 0) |
34368 | + err = au_wbr_nonopq(dentry, err); | |
34369 | + | |
4f0767ce | 34370 | +out: |
1facf9fc | 34371 | + AuDbg("%d\n", err); |
34372 | + return err; | |
34373 | +} | |
34374 | + | |
34375 | +/* ---------------------------------------------------------------------- */ | |
34376 | + | |
34377 | +/* most free space */ | |
392086de | 34378 | +static void au_mfs(struct dentry *dentry, struct dentry *parent) |
1facf9fc | 34379 | +{ |
34380 | + struct super_block *sb; | |
34381 | + struct au_branch *br; | |
34382 | + struct au_wbr_mfs *mfs; | |
392086de | 34383 | + struct dentry *h_parent; |
5afbbe0d | 34384 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 34385 | + int err; |
34386 | + unsigned long long b, bavail; | |
7f207e10 | 34387 | + struct path h_path; |
1facf9fc | 34388 | + /* reduce the stack usage */ |
34389 | + struct kstatfs *st; | |
34390 | + | |
34391 | + st = kmalloc(sizeof(*st), GFP_NOFS); | |
34392 | + if (unlikely(!st)) { | |
34393 | + AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM); | |
34394 | + return; | |
34395 | + } | |
34396 | + | |
34397 | + bavail = 0; | |
34398 | + sb = dentry->d_sb; | |
34399 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
dece6358 | 34400 | + MtxMustLock(&mfs->mfs_lock); |
1facf9fc | 34401 | + mfs->mfs_bindex = -EROFS; |
34402 | + mfs->mfsrr_bytes = 0; | |
392086de AM |
34403 | + if (!parent) { |
34404 | + bindex = 0; | |
5afbbe0d | 34405 | + bbot = au_sbbot(sb); |
392086de | 34406 | + } else { |
5afbbe0d AM |
34407 | + bindex = au_dbtop(parent); |
34408 | + bbot = au_dbtaildir(parent); | |
392086de AM |
34409 | + } |
34410 | + | |
5afbbe0d | 34411 | + for (; bindex <= bbot; bindex++) { |
392086de AM |
34412 | + if (parent) { |
34413 | + h_parent = au_h_dptr(parent, bindex); | |
5527c038 | 34414 | + if (!h_parent || d_is_negative(h_parent)) |
392086de AM |
34415 | + continue; |
34416 | + } | |
1facf9fc | 34417 | + br = au_sbr(sb, bindex); |
34418 | + if (au_br_rdonly(br)) | |
34419 | + continue; | |
34420 | + | |
34421 | + /* sb->s_root for NFS is unreliable */ | |
86dc4139 | 34422 | + h_path.mnt = au_br_mnt(br); |
7f207e10 AM |
34423 | + h_path.dentry = h_path.mnt->mnt_root; |
34424 | + err = vfs_statfs(&h_path, st); | |
1facf9fc | 34425 | + if (unlikely(err)) { |
34426 | + AuWarn1("failed statfs, b%d, %d\n", bindex, err); | |
34427 | + continue; | |
34428 | + } | |
34429 | + | |
34430 | + /* when the available size is equal, select the lower one */ | |
34431 | + BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail) | |
34432 | + || sizeof(b) < sizeof(st->f_bsize)); | |
34433 | + b = st->f_bavail * st->f_bsize; | |
34434 | + br->br_wbr->wbr_bytes = b; | |
34435 | + if (b >= bavail) { | |
34436 | + bavail = b; | |
34437 | + mfs->mfs_bindex = bindex; | |
34438 | + mfs->mfs_jiffy = jiffies; | |
34439 | + } | |
34440 | + } | |
34441 | + | |
34442 | + mfs->mfsrr_bytes = bavail; | |
34443 | + AuDbg("b%d\n", mfs->mfs_bindex); | |
9f237c51 | 34444 | + au_kfree_rcu(st); |
1facf9fc | 34445 | +} |
34446 | + | |
392086de | 34447 | +static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34448 | +{ |
34449 | + int err; | |
392086de | 34450 | + struct dentry *parent; |
1facf9fc | 34451 | + struct super_block *sb; |
34452 | + struct au_wbr_mfs *mfs; | |
34453 | + | |
34454 | + err = au_wbr_create_exp(dentry); | |
34455 | + if (err >= 0) | |
34456 | + goto out; | |
34457 | + | |
34458 | + sb = dentry->d_sb; | |
392086de AM |
34459 | + parent = NULL; |
34460 | + if (au_ftest_wbr(flags, PARENT)) | |
34461 | + parent = dget_parent(dentry); | |
1facf9fc | 34462 | + mfs = &au_sbi(sb)->si_wbr_mfs; |
34463 | + mutex_lock(&mfs->mfs_lock); | |
34464 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
34465 | + || mfs->mfs_bindex < 0 | |
34466 | + || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))) | |
392086de | 34467 | + au_mfs(dentry, parent); |
1facf9fc | 34468 | + mutex_unlock(&mfs->mfs_lock); |
34469 | + err = mfs->mfs_bindex; | |
392086de | 34470 | + dput(parent); |
1facf9fc | 34471 | + |
4a4d8108 AM |
34472 | + if (err >= 0) |
34473 | + err = au_wbr_nonopq(dentry, err); | |
34474 | + | |
4f0767ce | 34475 | +out: |
1facf9fc | 34476 | + AuDbg("b%d\n", err); |
34477 | + return err; | |
34478 | +} | |
34479 | + | |
34480 | +static int au_wbr_create_init_mfs(struct super_block *sb) | |
34481 | +{ | |
34482 | + struct au_wbr_mfs *mfs; | |
34483 | + | |
34484 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34485 | + mutex_init(&mfs->mfs_lock); | |
34486 | + mfs->mfs_jiffy = 0; | |
34487 | + mfs->mfs_bindex = -EROFS; | |
34488 | + | |
34489 | + return 0; | |
34490 | +} | |
34491 | + | |
34492 | +static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused) | |
34493 | +{ | |
34494 | + mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock); | |
34495 | + return 0; | |
34496 | +} | |
34497 | + | |
34498 | +/* ---------------------------------------------------------------------- */ | |
34499 | + | |
f2c43d5f AM |
34500 | +/* top down regardless parent, and then mfs */ |
34501 | +static int au_wbr_create_tdmfs(struct dentry *dentry, | |
34502 | + unsigned int flags __maybe_unused) | |
34503 | +{ | |
34504 | + int err; | |
34505 | + aufs_bindex_t bwh, btail, bindex, bfound, bmfs; | |
34506 | + unsigned long long watermark; | |
34507 | + struct super_block *sb; | |
34508 | + struct au_wbr_mfs *mfs; | |
34509 | + struct au_branch *br; | |
34510 | + struct dentry *parent; | |
34511 | + | |
34512 | + sb = dentry->d_sb; | |
34513 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34514 | + mutex_lock(&mfs->mfs_lock); | |
34515 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
34516 | + || mfs->mfs_bindex < 0) | |
34517 | + au_mfs(dentry, /*parent*/NULL); | |
34518 | + watermark = mfs->mfsrr_watermark; | |
34519 | + bmfs = mfs->mfs_bindex; | |
34520 | + mutex_unlock(&mfs->mfs_lock); | |
34521 | + | |
34522 | + /* another style of au_wbr_create_exp() */ | |
34523 | + bwh = au_dbwh(dentry); | |
34524 | + parent = dget_parent(dentry); | |
34525 | + btail = au_dbtaildir(parent); | |
34526 | + if (bwh >= 0 && bwh < btail) | |
34527 | + btail = bwh; | |
34528 | + | |
34529 | + err = au_wbr_nonopq(dentry, btail); | |
34530 | + if (unlikely(err < 0)) | |
34531 | + goto out; | |
34532 | + btail = err; | |
34533 | + bfound = -1; | |
34534 | + for (bindex = 0; bindex <= btail; bindex++) { | |
34535 | + br = au_sbr(sb, bindex); | |
34536 | + if (au_br_rdonly(br)) | |
34537 | + continue; | |
34538 | + if (br->br_wbr->wbr_bytes > watermark) { | |
34539 | + bfound = bindex; | |
34540 | + break; | |
34541 | + } | |
34542 | + } | |
34543 | + err = bfound; | |
34544 | + if (err < 0) | |
34545 | + err = bmfs; | |
34546 | + | |
34547 | +out: | |
34548 | + dput(parent); | |
34549 | + AuDbg("b%d\n", err); | |
34550 | + return err; | |
34551 | +} | |
34552 | + | |
34553 | +/* ---------------------------------------------------------------------- */ | |
34554 | + | |
1facf9fc | 34555 | +/* most free space and then round robin */ |
392086de | 34556 | +static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34557 | +{ |
34558 | + int err; | |
34559 | + struct au_wbr_mfs *mfs; | |
34560 | + | |
392086de | 34561 | + err = au_wbr_create_mfs(dentry, flags); |
1facf9fc | 34562 | + if (err >= 0) { |
34563 | + mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs; | |
dece6358 | 34564 | + mutex_lock(&mfs->mfs_lock); |
1facf9fc | 34565 | + if (mfs->mfsrr_bytes < mfs->mfsrr_watermark) |
392086de | 34566 | + err = au_wbr_create_rr(dentry, flags); |
dece6358 | 34567 | + mutex_unlock(&mfs->mfs_lock); |
1facf9fc | 34568 | + } |
34569 | + | |
34570 | + AuDbg("b%d\n", err); | |
34571 | + return err; | |
34572 | +} | |
34573 | + | |
34574 | +static int au_wbr_create_init_mfsrr(struct super_block *sb) | |
34575 | +{ | |
34576 | + int err; | |
34577 | + | |
34578 | + au_wbr_create_init_mfs(sb); /* ignore */ | |
34579 | + err = au_wbr_create_init_rr(sb); | |
34580 | + | |
34581 | + return err; | |
34582 | +} | |
34583 | + | |
34584 | +/* ---------------------------------------------------------------------- */ | |
34585 | + | |
34586 | +/* top down parent and most free space */ | |
392086de | 34587 | +static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34588 | +{ |
34589 | + int err, e2; | |
34590 | + unsigned long long b; | |
5afbbe0d | 34591 | + aufs_bindex_t bindex, btop, bbot; |
1facf9fc | 34592 | + struct super_block *sb; |
34593 | + struct dentry *parent, *h_parent; | |
34594 | + struct au_branch *br; | |
34595 | + | |
392086de | 34596 | + err = au_wbr_create_tdp(dentry, flags); |
1facf9fc | 34597 | + if (unlikely(err < 0)) |
34598 | + goto out; | |
34599 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
34600 | + btop = au_dbtop(parent); |
34601 | + bbot = au_dbtaildir(parent); | |
34602 | + if (btop == bbot) | |
1facf9fc | 34603 | + goto out_parent; /* success */ |
34604 | + | |
392086de | 34605 | + e2 = au_wbr_create_mfs(dentry, flags); |
1facf9fc | 34606 | + if (e2 < 0) |
34607 | + goto out_parent; /* success */ | |
34608 | + | |
34609 | + /* when the available size is equal, select upper one */ | |
34610 | + sb = dentry->d_sb; | |
34611 | + br = au_sbr(sb, err); | |
34612 | + b = br->br_wbr->wbr_bytes; | |
34613 | + AuDbg("b%d, %llu\n", err, b); | |
34614 | + | |
5afbbe0d | 34615 | + for (bindex = btop; bindex <= bbot; bindex++) { |
1facf9fc | 34616 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34617 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34618 | + continue; |
34619 | + | |
34620 | + br = au_sbr(sb, bindex); | |
34621 | + if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) { | |
34622 | + b = br->br_wbr->wbr_bytes; | |
34623 | + err = bindex; | |
34624 | + AuDbg("b%d, %llu\n", err, b); | |
34625 | + } | |
34626 | + } | |
34627 | + | |
4a4d8108 AM |
34628 | + if (err >= 0) |
34629 | + err = au_wbr_nonopq(dentry, err); | |
34630 | + | |
4f0767ce | 34631 | +out_parent: |
1facf9fc | 34632 | + dput(parent); |
4f0767ce | 34633 | +out: |
1facf9fc | 34634 | + AuDbg("b%d\n", err); |
34635 | + return err; | |
34636 | +} | |
34637 | + | |
34638 | +/* ---------------------------------------------------------------------- */ | |
34639 | + | |
392086de AM |
34640 | +/* |
34641 | + * - top down parent | |
34642 | + * - most free space with parent | |
34643 | + * - most free space round-robin regardless parent | |
34644 | + */ | |
34645 | +static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags) | |
34646 | +{ | |
34647 | + int err; | |
34648 | + unsigned long long watermark; | |
34649 | + struct super_block *sb; | |
34650 | + struct au_branch *br; | |
34651 | + struct au_wbr_mfs *mfs; | |
34652 | + | |
34653 | + err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT); | |
34654 | + if (unlikely(err < 0)) | |
34655 | + goto out; | |
34656 | + | |
34657 | + sb = dentry->d_sb; | |
34658 | + br = au_sbr(sb, err); | |
34659 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34660 | + mutex_lock(&mfs->mfs_lock); | |
34661 | + watermark = mfs->mfsrr_watermark; | |
34662 | + mutex_unlock(&mfs->mfs_lock); | |
34663 | + if (br->br_wbr->wbr_bytes < watermark) | |
34664 | + /* regardless the parent dir */ | |
34665 | + err = au_wbr_create_mfsrr(dentry, flags); | |
34666 | + | |
34667 | +out: | |
34668 | + AuDbg("b%d\n", err); | |
34669 | + return err; | |
34670 | +} | |
34671 | + | |
34672 | +/* ---------------------------------------------------------------------- */ | |
34673 | + | |
1facf9fc | 34674 | +/* policies for copyup */ |
34675 | + | |
34676 | +/* top down parent */ | |
34677 | +static int au_wbr_copyup_tdp(struct dentry *dentry) | |
34678 | +{ | |
392086de | 34679 | + return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0); |
1facf9fc | 34680 | +} |
34681 | + | |
34682 | +/* bottom up parent */ | |
34683 | +static int au_wbr_copyup_bup(struct dentry *dentry) | |
34684 | +{ | |
34685 | + int err; | |
5afbbe0d | 34686 | + aufs_bindex_t bindex, btop; |
1facf9fc | 34687 | + struct dentry *parent, *h_parent; |
34688 | + struct super_block *sb; | |
34689 | + | |
34690 | + err = -EROFS; | |
34691 | + sb = dentry->d_sb; | |
34692 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
34693 | + btop = au_dbtop(parent); |
34694 | + for (bindex = au_dbtop(dentry); bindex >= btop; bindex--) { | |
1facf9fc | 34695 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34696 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34697 | + continue; |
34698 | + | |
34699 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
34700 | + err = bindex; | |
34701 | + break; | |
34702 | + } | |
34703 | + } | |
34704 | + dput(parent); | |
34705 | + | |
34706 | + /* bottom up here */ | |
34707 | + if (unlikely(err < 0)) | |
5afbbe0d | 34708 | + err = au_wbr_bu(sb, btop - 1); |
1facf9fc | 34709 | + |
34710 | + AuDbg("b%d\n", err); | |
34711 | + return err; | |
34712 | +} | |
34713 | + | |
34714 | +/* bottom up */ | |
5afbbe0d | 34715 | +int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop) |
1facf9fc | 34716 | +{ |
34717 | + int err; | |
34718 | + | |
5afbbe0d | 34719 | + err = au_wbr_bu(dentry->d_sb, btop); |
4a4d8108 | 34720 | + AuDbg("b%d\n", err); |
5afbbe0d | 34721 | + if (err > btop) |
4a4d8108 | 34722 | + err = au_wbr_nonopq(dentry, err); |
1facf9fc | 34723 | + |
34724 | + AuDbg("b%d\n", err); | |
34725 | + return err; | |
34726 | +} | |
34727 | + | |
076b876e AM |
34728 | +static int au_wbr_copyup_bu(struct dentry *dentry) |
34729 | +{ | |
34730 | + int err; | |
5afbbe0d | 34731 | + aufs_bindex_t btop; |
076b876e | 34732 | + |
5afbbe0d AM |
34733 | + btop = au_dbtop(dentry); |
34734 | + err = au_wbr_do_copyup_bu(dentry, btop); | |
076b876e AM |
34735 | + return err; |
34736 | +} | |
34737 | + | |
1facf9fc | 34738 | +/* ---------------------------------------------------------------------- */ |
34739 | + | |
34740 | +struct au_wbr_copyup_operations au_wbr_copyup_ops[] = { | |
34741 | + [AuWbrCopyup_TDP] = { | |
34742 | + .copyup = au_wbr_copyup_tdp | |
34743 | + }, | |
34744 | + [AuWbrCopyup_BUP] = { | |
34745 | + .copyup = au_wbr_copyup_bup | |
34746 | + }, | |
34747 | + [AuWbrCopyup_BU] = { | |
34748 | + .copyup = au_wbr_copyup_bu | |
34749 | + } | |
34750 | +}; | |
34751 | + | |
34752 | +struct au_wbr_create_operations au_wbr_create_ops[] = { | |
34753 | + [AuWbrCreate_TDP] = { | |
34754 | + .create = au_wbr_create_tdp | |
34755 | + }, | |
34756 | + [AuWbrCreate_RR] = { | |
34757 | + .create = au_wbr_create_rr, | |
34758 | + .init = au_wbr_create_init_rr | |
34759 | + }, | |
34760 | + [AuWbrCreate_MFS] = { | |
34761 | + .create = au_wbr_create_mfs, | |
34762 | + .init = au_wbr_create_init_mfs, | |
34763 | + .fin = au_wbr_create_fin_mfs | |
34764 | + }, | |
34765 | + [AuWbrCreate_MFSV] = { | |
34766 | + .create = au_wbr_create_mfs, | |
34767 | + .init = au_wbr_create_init_mfs, | |
34768 | + .fin = au_wbr_create_fin_mfs | |
34769 | + }, | |
34770 | + [AuWbrCreate_MFSRR] = { | |
34771 | + .create = au_wbr_create_mfsrr, | |
34772 | + .init = au_wbr_create_init_mfsrr, | |
34773 | + .fin = au_wbr_create_fin_mfs | |
34774 | + }, | |
34775 | + [AuWbrCreate_MFSRRV] = { | |
34776 | + .create = au_wbr_create_mfsrr, | |
34777 | + .init = au_wbr_create_init_mfsrr, | |
34778 | + .fin = au_wbr_create_fin_mfs | |
34779 | + }, | |
f2c43d5f AM |
34780 | + [AuWbrCreate_TDMFS] = { |
34781 | + .create = au_wbr_create_tdmfs, | |
34782 | + .init = au_wbr_create_init_mfs, | |
34783 | + .fin = au_wbr_create_fin_mfs | |
34784 | + }, | |
34785 | + [AuWbrCreate_TDMFSV] = { | |
34786 | + .create = au_wbr_create_tdmfs, | |
34787 | + .init = au_wbr_create_init_mfs, | |
34788 | + .fin = au_wbr_create_fin_mfs | |
34789 | + }, | |
1facf9fc | 34790 | + [AuWbrCreate_PMFS] = { |
34791 | + .create = au_wbr_create_pmfs, | |
34792 | + .init = au_wbr_create_init_mfs, | |
34793 | + .fin = au_wbr_create_fin_mfs | |
34794 | + }, | |
34795 | + [AuWbrCreate_PMFSV] = { | |
34796 | + .create = au_wbr_create_pmfs, | |
34797 | + .init = au_wbr_create_init_mfs, | |
34798 | + .fin = au_wbr_create_fin_mfs | |
392086de AM |
34799 | + }, |
34800 | + [AuWbrCreate_PMFSRR] = { | |
34801 | + .create = au_wbr_create_pmfsrr, | |
34802 | + .init = au_wbr_create_init_mfsrr, | |
34803 | + .fin = au_wbr_create_fin_mfs | |
34804 | + }, | |
34805 | + [AuWbrCreate_PMFSRRV] = { | |
34806 | + .create = au_wbr_create_pmfsrr, | |
34807 | + .init = au_wbr_create_init_mfsrr, | |
34808 | + .fin = au_wbr_create_fin_mfs | |
1facf9fc | 34809 | + } |
34810 | +}; | |
7f207e10 | 34811 | diff -urN /usr/share/empty/fs/aufs/whout.c linux/fs/aufs/whout.c |
eca34b5c | 34812 | --- /usr/share/empty/fs/aufs/whout.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 34813 | +++ linux/fs/aufs/whout.c 2020-01-27 10:57:18.178871751 +0100 |
062440b3 | 34814 | @@ -0,0 +1,1062 @@ |
cd7a4cd9 | 34815 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 34816 | +/* |
016522bc | 34817 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 34818 | + * |
34819 | + * This program, aufs is free software; you can redistribute it and/or modify | |
34820 | + * it under the terms of the GNU General Public License as published by | |
34821 | + * the Free Software Foundation; either version 2 of the License, or | |
34822 | + * (at your option) any later version. | |
dece6358 AM |
34823 | + * |
34824 | + * This program is distributed in the hope that it will be useful, | |
34825 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
34826 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
34827 | + * GNU General Public License for more details. | |
34828 | + * | |
34829 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 34830 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 34831 | + */ |
34832 | + | |
34833 | +/* | |
34834 | + * whiteout for logical deletion and opaque directory | |
34835 | + */ | |
34836 | + | |
1facf9fc | 34837 | +#include "aufs.h" |
34838 | + | |
cd7a4cd9 | 34839 | +#define WH_MASK 0444 |
1facf9fc | 34840 | + |
34841 | +/* | |
34842 | + * If a directory contains this file, then it is opaque. We start with the | |
34843 | + * .wh. flag so that it is blocked by lookup. | |
34844 | + */ | |
0c3ec466 AM |
34845 | +static struct qstr diropq_name = QSTR_INIT(AUFS_WH_DIROPQ, |
34846 | + sizeof(AUFS_WH_DIROPQ) - 1); | |
1facf9fc | 34847 | + |
34848 | +/* | |
34849 | + * generate whiteout name, which is NOT terminated by NULL. | |
34850 | + * @name: original d_name.name | |
34851 | + * @len: original d_name.len | |
34852 | + * @wh: whiteout qstr | |
34853 | + * returns zero when succeeds, otherwise error. | |
34854 | + * succeeded value as wh->name should be freed by kfree(). | |
34855 | + */ | |
34856 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name) | |
34857 | +{ | |
34858 | + char *p; | |
34859 | + | |
34860 | + if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN)) | |
34861 | + return -ENAMETOOLONG; | |
34862 | + | |
34863 | + wh->len = name->len + AUFS_WH_PFX_LEN; | |
34864 | + p = kmalloc(wh->len, GFP_NOFS); | |
34865 | + wh->name = p; | |
34866 | + if (p) { | |
34867 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
34868 | + memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len); | |
34869 | + /* smp_mb(); */ | |
34870 | + return 0; | |
34871 | + } | |
34872 | + return -ENOMEM; | |
34873 | +} | |
34874 | + | |
34875 | +/* ---------------------------------------------------------------------- */ | |
34876 | + | |
34877 | +/* | |
34878 | + * test if the @wh_name exists under @h_parent. | |
34879 | + * @try_sio specifies the necessary of super-io. | |
34880 | + */ | |
076b876e | 34881 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio) |
1facf9fc | 34882 | +{ |
34883 | + int err; | |
34884 | + struct dentry *wh_dentry; | |
1facf9fc | 34885 | + |
1facf9fc | 34886 | + if (!try_sio) |
b4510431 | 34887 | + wh_dentry = vfsub_lkup_one(wh_name, h_parent); |
1facf9fc | 34888 | + else |
076b876e | 34889 | + wh_dentry = au_sio_lkup_one(wh_name, h_parent); |
1facf9fc | 34890 | + err = PTR_ERR(wh_dentry); |
2000de60 JR |
34891 | + if (IS_ERR(wh_dentry)) { |
34892 | + if (err == -ENAMETOOLONG) | |
34893 | + err = 0; | |
1facf9fc | 34894 | + goto out; |
2000de60 | 34895 | + } |
1facf9fc | 34896 | + |
34897 | + err = 0; | |
5527c038 | 34898 | + if (d_is_negative(wh_dentry)) |
1facf9fc | 34899 | + goto out_wh; /* success */ |
34900 | + | |
34901 | + err = 1; | |
7e9cd9fe | 34902 | + if (d_is_reg(wh_dentry)) |
1facf9fc | 34903 | + goto out_wh; /* success */ |
34904 | + | |
34905 | + err = -EIO; | |
523b37e3 | 34906 | + AuIOErr("%pd Invalid whiteout entry type 0%o.\n", |
5527c038 | 34907 | + wh_dentry, d_inode(wh_dentry)->i_mode); |
1facf9fc | 34908 | + |
4f0767ce | 34909 | +out_wh: |
1facf9fc | 34910 | + dput(wh_dentry); |
4f0767ce | 34911 | +out: |
1facf9fc | 34912 | + return err; |
34913 | +} | |
34914 | + | |
34915 | +/* | |
34916 | + * test if the @h_dentry sets opaque or not. | |
34917 | + */ | |
076b876e | 34918 | +int au_diropq_test(struct dentry *h_dentry) |
1facf9fc | 34919 | +{ |
34920 | + int err; | |
34921 | + struct inode *h_dir; | |
34922 | + | |
5527c038 | 34923 | + h_dir = d_inode(h_dentry); |
076b876e | 34924 | + err = au_wh_test(h_dentry, &diropq_name, |
1facf9fc | 34925 | + au_test_h_perm_sio(h_dir, MAY_EXEC)); |
34926 | + return err; | |
34927 | +} | |
34928 | + | |
34929 | +/* | |
34930 | + * returns a negative dentry whose name is unique and temporary. | |
34931 | + */ | |
34932 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
34933 | + struct qstr *prefix) | |
34934 | +{ | |
1facf9fc | 34935 | + struct dentry *dentry; |
34936 | + int i; | |
027c5e7a | 34937 | + char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1], |
4a4d8108 | 34938 | + *name, *p; |
027c5e7a | 34939 | + /* strict atomic_t is unnecessary here */ |
1facf9fc | 34940 | + static unsigned short cnt; |
34941 | + struct qstr qs; | |
34942 | + | |
4a4d8108 AM |
34943 | + BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN); |
34944 | + | |
1facf9fc | 34945 | + name = defname; |
027c5e7a AM |
34946 | + qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1; |
34947 | + if (unlikely(prefix->len > DNAME_INLINE_LEN)) { | |
1facf9fc | 34948 | + dentry = ERR_PTR(-ENAMETOOLONG); |
4a4d8108 | 34949 | + if (unlikely(qs.len > NAME_MAX)) |
1facf9fc | 34950 | + goto out; |
34951 | + dentry = ERR_PTR(-ENOMEM); | |
34952 | + name = kmalloc(qs.len + 1, GFP_NOFS); | |
34953 | + if (unlikely(!name)) | |
34954 | + goto out; | |
34955 | + } | |
34956 | + | |
34957 | + /* doubly whiteout-ed */ | |
34958 | + memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2); | |
34959 | + p = name + AUFS_WH_PFX_LEN * 2; | |
34960 | + memcpy(p, prefix->name, prefix->len); | |
34961 | + p += prefix->len; | |
34962 | + *p++ = '.'; | |
4a4d8108 | 34963 | + AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN); |
1facf9fc | 34964 | + |
34965 | + qs.name = name; | |
34966 | + for (i = 0; i < 3; i++) { | |
b752ccd1 | 34967 | + sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++); |
076b876e | 34968 | + dentry = au_sio_lkup_one(&qs, h_parent); |
5527c038 | 34969 | + if (IS_ERR(dentry) || d_is_negative(dentry)) |
1facf9fc | 34970 | + goto out_name; |
34971 | + dput(dentry); | |
34972 | + } | |
0c3ec466 | 34973 | + /* pr_warn("could not get random name\n"); */ |
1facf9fc | 34974 | + dentry = ERR_PTR(-EEXIST); |
34975 | + AuDbg("%.*s\n", AuLNPair(&qs)); | |
34976 | + BUG(); | |
34977 | + | |
4f0767ce | 34978 | +out_name: |
1facf9fc | 34979 | + if (name != defname) |
9f237c51 | 34980 | + au_kfree_try_rcu(name); |
4f0767ce | 34981 | +out: |
4a4d8108 | 34982 | + AuTraceErrPtr(dentry); |
1facf9fc | 34983 | + return dentry; |
1facf9fc | 34984 | +} |
34985 | + | |
34986 | +/* | |
34987 | + * rename the @h_dentry on @br to the whiteouted temporary name. | |
34988 | + */ | |
34989 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br) | |
34990 | +{ | |
34991 | + int err; | |
34992 | + struct path h_path = { | |
86dc4139 | 34993 | + .mnt = au_br_mnt(br) |
1facf9fc | 34994 | + }; |
523b37e3 | 34995 | + struct inode *h_dir, *delegated; |
1facf9fc | 34996 | + struct dentry *h_parent; |
34997 | + | |
34998 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ | |
5527c038 | 34999 | + h_dir = d_inode(h_parent); |
1facf9fc | 35000 | + IMustLock(h_dir); |
35001 | + | |
35002 | + h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name); | |
35003 | + err = PTR_ERR(h_path.dentry); | |
35004 | + if (IS_ERR(h_path.dentry)) | |
35005 | + goto out; | |
35006 | + | |
35007 | + /* under the same dir, no need to lock_rename() */ | |
523b37e3 | 35008 | + delegated = NULL; |
f2c43d5f AM |
35009 | + err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path, &delegated, |
35010 | + /*flags*/0); | |
1facf9fc | 35011 | + AuTraceErr(err); |
523b37e3 AM |
35012 | + if (unlikely(err == -EWOULDBLOCK)) { |
35013 | + pr_warn("cannot retry for NFSv4 delegation" | |
35014 | + " for an internal rename\n"); | |
35015 | + iput(delegated); | |
35016 | + } | |
1facf9fc | 35017 | + dput(h_path.dentry); |
35018 | + | |
4f0767ce | 35019 | +out: |
4a4d8108 | 35020 | + AuTraceErr(err); |
1facf9fc | 35021 | + return err; |
35022 | +} | |
35023 | + | |
35024 | +/* ---------------------------------------------------------------------- */ | |
35025 | +/* | |
35026 | + * functions for removing a whiteout | |
35027 | + */ | |
35028 | + | |
35029 | +static int do_unlink_wh(struct inode *h_dir, struct path *h_path) | |
35030 | +{ | |
523b37e3 AM |
35031 | + int err, force; |
35032 | + struct inode *delegated; | |
1facf9fc | 35033 | + |
35034 | + /* | |
35035 | + * forces superio when the dir has a sticky bit. | |
35036 | + * this may be a violation of unix fs semantics. | |
35037 | + */ | |
35038 | + force = (h_dir->i_mode & S_ISVTX) | |
5527c038 | 35039 | + && !uid_eq(current_fsuid(), d_inode(h_path->dentry)->i_uid); |
523b37e3 AM |
35040 | + delegated = NULL; |
35041 | + err = vfsub_unlink(h_dir, h_path, &delegated, force); | |
35042 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35043 | + pr_warn("cannot retry for NFSv4 delegation" | |
35044 | + " for an internal unlink\n"); | |
35045 | + iput(delegated); | |
35046 | + } | |
35047 | + return err; | |
1facf9fc | 35048 | +} |
35049 | + | |
35050 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
35051 | + struct dentry *dentry) | |
35052 | +{ | |
35053 | + int err; | |
35054 | + | |
35055 | + err = do_unlink_wh(h_dir, h_path); | |
35056 | + if (!err && dentry) | |
35057 | + au_set_dbwh(dentry, -1); | |
35058 | + | |
35059 | + return err; | |
35060 | +} | |
35061 | + | |
35062 | +static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh, | |
35063 | + struct au_branch *br) | |
35064 | +{ | |
35065 | + int err; | |
35066 | + struct path h_path = { | |
86dc4139 | 35067 | + .mnt = au_br_mnt(br) |
1facf9fc | 35068 | + }; |
35069 | + | |
35070 | + err = 0; | |
b4510431 | 35071 | + h_path.dentry = vfsub_lkup_one(wh, h_parent); |
1facf9fc | 35072 | + if (IS_ERR(h_path.dentry)) |
35073 | + err = PTR_ERR(h_path.dentry); | |
35074 | + else { | |
5527c038 JR |
35075 | + if (d_is_reg(h_path.dentry)) |
35076 | + err = do_unlink_wh(d_inode(h_parent), &h_path); | |
1facf9fc | 35077 | + dput(h_path.dentry); |
35078 | + } | |
35079 | + | |
35080 | + return err; | |
35081 | +} | |
35082 | + | |
35083 | +/* ---------------------------------------------------------------------- */ | |
35084 | +/* | |
35085 | + * initialize/clean whiteout for a branch | |
35086 | + */ | |
35087 | + | |
35088 | +static void au_wh_clean(struct inode *h_dir, struct path *whpath, | |
35089 | + const int isdir) | |
35090 | +{ | |
35091 | + int err; | |
523b37e3 | 35092 | + struct inode *delegated; |
1facf9fc | 35093 | + |
5527c038 | 35094 | + if (d_is_negative(whpath->dentry)) |
1facf9fc | 35095 | + return; |
35096 | + | |
86dc4139 AM |
35097 | + if (isdir) |
35098 | + err = vfsub_rmdir(h_dir, whpath); | |
523b37e3 AM |
35099 | + else { |
35100 | + delegated = NULL; | |
35101 | + err = vfsub_unlink(h_dir, whpath, &delegated, /*force*/0); | |
35102 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35103 | + pr_warn("cannot retry for NFSv4 delegation" | |
35104 | + " for an internal unlink\n"); | |
35105 | + iput(delegated); | |
35106 | + } | |
35107 | + } | |
1facf9fc | 35108 | + if (unlikely(err)) |
523b37e3 AM |
35109 | + pr_warn("failed removing %pd (%d), ignored.\n", |
35110 | + whpath->dentry, err); | |
1facf9fc | 35111 | +} |
35112 | + | |
35113 | +static int test_linkable(struct dentry *h_root) | |
35114 | +{ | |
5527c038 | 35115 | + struct inode *h_dir = d_inode(h_root); |
1facf9fc | 35116 | + |
35117 | + if (h_dir->i_op->link) | |
35118 | + return 0; | |
35119 | + | |
523b37e3 AM |
35120 | + pr_err("%pd (%s) doesn't support link(2), use noplink and rw+nolwh\n", |
35121 | + h_root, au_sbtype(h_root->d_sb)); | |
43982f53 | 35122 | + return -ENOSYS; /* the branch doesn't have its ->link() */ |
1facf9fc | 35123 | +} |
35124 | + | |
35125 | +/* todo: should this mkdir be done in /sbin/mount.aufs helper? */ | |
35126 | +static int au_whdir(struct inode *h_dir, struct path *path) | |
35127 | +{ | |
35128 | + int err; | |
35129 | + | |
35130 | + err = -EEXIST; | |
5527c038 | 35131 | + if (d_is_negative(path->dentry)) { |
cd7a4cd9 | 35132 | + int mode = 0700; |
1facf9fc | 35133 | + |
35134 | + if (au_test_nfs(path->dentry->d_sb)) | |
cd7a4cd9 | 35135 | + mode |= 0111; |
86dc4139 | 35136 | + err = vfsub_mkdir(h_dir, path, mode); |
2000de60 | 35137 | + } else if (d_is_dir(path->dentry)) |
1facf9fc | 35138 | + err = 0; |
35139 | + else | |
523b37e3 | 35140 | + pr_err("unknown %pd exists\n", path->dentry); |
1facf9fc | 35141 | + |
35142 | + return err; | |
35143 | +} | |
35144 | + | |
35145 | +struct au_wh_base { | |
35146 | + const struct qstr *name; | |
35147 | + struct dentry *dentry; | |
35148 | +}; | |
35149 | + | |
35150 | +static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[], | |
35151 | + struct path *h_path) | |
35152 | +{ | |
35153 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
35154 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
35155 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
35156 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
35157 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
35158 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
35159 | +} | |
35160 | + | |
35161 | +/* | |
35162 | + * returns tri-state, | |
c1595e42 | 35163 | + * minus: error, caller should print the message |
acd2b654 | 35164 | + * zero: success |
c1595e42 | 35165 | + * plus: error, caller should NOT print the message |
1facf9fc | 35166 | + */ |
35167 | +static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr, | |
35168 | + int do_plink, struct au_wh_base base[], | |
35169 | + struct path *h_path) | |
35170 | +{ | |
35171 | + int err; | |
35172 | + struct inode *h_dir; | |
35173 | + | |
5527c038 | 35174 | + h_dir = d_inode(h_root); |
1facf9fc | 35175 | + h_path->dentry = base[AuBrWh_BASE].dentry; |
35176 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
35177 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
35178 | + if (do_plink) { | |
35179 | + err = test_linkable(h_root); | |
35180 | + if (unlikely(err)) { | |
35181 | + err = 1; | |
35182 | + goto out; | |
35183 | + } | |
35184 | + | |
35185 | + err = au_whdir(h_dir, h_path); | |
35186 | + if (unlikely(err)) | |
35187 | + goto out; | |
35188 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
35189 | + } else | |
35190 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
35191 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
35192 | + err = au_whdir(h_dir, h_path); | |
35193 | + if (unlikely(err)) | |
35194 | + goto out; | |
35195 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
35196 | + | |
4f0767ce | 35197 | +out: |
1facf9fc | 35198 | + return err; |
35199 | +} | |
35200 | + | |
35201 | +/* | |
35202 | + * for the moment, aufs supports the branch filesystem which does not support | |
35203 | + * link(2). testing on FAT which does not support i_op->setattr() fully either, | |
35204 | + * copyup failed. finally, such filesystem will not be used as the writable | |
35205 | + * branch. | |
35206 | + * | |
35207 | + * returns tri-state, see above. | |
35208 | + */ | |
35209 | +static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr, | |
35210 | + int do_plink, struct au_wh_base base[], | |
35211 | + struct path *h_path) | |
35212 | +{ | |
35213 | + int err; | |
35214 | + struct inode *h_dir; | |
35215 | + | |
1308ab2a | 35216 | + WbrWhMustWriteLock(wbr); |
35217 | + | |
1facf9fc | 35218 | + err = test_linkable(h_root); |
35219 | + if (unlikely(err)) { | |
35220 | + err = 1; | |
35221 | + goto out; | |
35222 | + } | |
35223 | + | |
35224 | + /* | |
35225 | + * todo: should this create be done in /sbin/mount.aufs helper? | |
35226 | + */ | |
35227 | + err = -EEXIST; | |
5527c038 JR |
35228 | + h_dir = d_inode(h_root); |
35229 | + if (d_is_negative(base[AuBrWh_BASE].dentry)) { | |
86dc4139 AM |
35230 | + h_path->dentry = base[AuBrWh_BASE].dentry; |
35231 | + err = vfsub_create(h_dir, h_path, WH_MASK, /*want_excl*/true); | |
7e9cd9fe | 35232 | + } else if (d_is_reg(base[AuBrWh_BASE].dentry)) |
1facf9fc | 35233 | + err = 0; |
35234 | + else | |
523b37e3 | 35235 | + pr_err("unknown %pd2 exists\n", base[AuBrWh_BASE].dentry); |
1facf9fc | 35236 | + if (unlikely(err)) |
35237 | + goto out; | |
35238 | + | |
35239 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
35240 | + if (do_plink) { | |
35241 | + err = au_whdir(h_dir, h_path); | |
35242 | + if (unlikely(err)) | |
35243 | + goto out; | |
35244 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
35245 | + } else | |
35246 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
35247 | + wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry); | |
35248 | + | |
35249 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
35250 | + err = au_whdir(h_dir, h_path); | |
35251 | + if (unlikely(err)) | |
35252 | + goto out; | |
35253 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
35254 | + | |
4f0767ce | 35255 | +out: |
1facf9fc | 35256 | + return err; |
35257 | +} | |
35258 | + | |
35259 | +/* | |
35260 | + * initialize the whiteout base file/dir for @br. | |
35261 | + */ | |
86dc4139 | 35262 | +int au_wh_init(struct au_branch *br, struct super_block *sb) |
1facf9fc | 35263 | +{ |
35264 | + int err, i; | |
35265 | + const unsigned char do_plink | |
35266 | + = !!au_opt_test(au_mntflags(sb), PLINK); | |
1facf9fc | 35267 | + struct inode *h_dir; |
86dc4139 AM |
35268 | + struct path path = br->br_path; |
35269 | + struct dentry *h_root = path.dentry; | |
1facf9fc | 35270 | + struct au_wbr *wbr = br->br_wbr; |
35271 | + static const struct qstr base_name[] = { | |
0c3ec466 AM |
35272 | + [AuBrWh_BASE] = QSTR_INIT(AUFS_BASE_NAME, |
35273 | + sizeof(AUFS_BASE_NAME) - 1), | |
35274 | + [AuBrWh_PLINK] = QSTR_INIT(AUFS_PLINKDIR_NAME, | |
35275 | + sizeof(AUFS_PLINKDIR_NAME) - 1), | |
35276 | + [AuBrWh_ORPH] = QSTR_INIT(AUFS_ORPHDIR_NAME, | |
35277 | + sizeof(AUFS_ORPHDIR_NAME) - 1) | |
1facf9fc | 35278 | + }; |
35279 | + struct au_wh_base base[] = { | |
35280 | + [AuBrWh_BASE] = { | |
35281 | + .name = base_name + AuBrWh_BASE, | |
35282 | + .dentry = NULL | |
35283 | + }, | |
35284 | + [AuBrWh_PLINK] = { | |
35285 | + .name = base_name + AuBrWh_PLINK, | |
35286 | + .dentry = NULL | |
35287 | + }, | |
35288 | + [AuBrWh_ORPH] = { | |
35289 | + .name = base_name + AuBrWh_ORPH, | |
35290 | + .dentry = NULL | |
35291 | + } | |
35292 | + }; | |
35293 | + | |
1308ab2a | 35294 | + if (wbr) |
35295 | + WbrWhMustWriteLock(wbr); | |
1facf9fc | 35296 | + |
1facf9fc | 35297 | + for (i = 0; i < AuBrWh_Last; i++) { |
35298 | + /* doubly whiteouted */ | |
35299 | + struct dentry *d; | |
35300 | + | |
35301 | + d = au_wh_lkup(h_root, (void *)base[i].name, br); | |
35302 | + err = PTR_ERR(d); | |
35303 | + if (IS_ERR(d)) | |
35304 | + goto out; | |
35305 | + | |
35306 | + base[i].dentry = d; | |
35307 | + AuDebugOn(wbr | |
35308 | + && wbr->wbr_wh[i] | |
35309 | + && wbr->wbr_wh[i] != base[i].dentry); | |
35310 | + } | |
35311 | + | |
35312 | + if (wbr) | |
35313 | + for (i = 0; i < AuBrWh_Last; i++) { | |
35314 | + dput(wbr->wbr_wh[i]); | |
35315 | + wbr->wbr_wh[i] = NULL; | |
35316 | + } | |
35317 | + | |
35318 | + err = 0; | |
1e00d052 | 35319 | + if (!au_br_writable(br->br_perm)) { |
5527c038 | 35320 | + h_dir = d_inode(h_root); |
1facf9fc | 35321 | + au_wh_init_ro(h_dir, base, &path); |
1e00d052 | 35322 | + } else if (!au_br_wh_linkable(br->br_perm)) { |
1facf9fc | 35323 | + err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path); |
35324 | + if (err > 0) | |
35325 | + goto out; | |
35326 | + else if (err) | |
35327 | + goto out_err; | |
1e00d052 | 35328 | + } else { |
1facf9fc | 35329 | + err = au_wh_init_rw(h_root, wbr, do_plink, base, &path); |
35330 | + if (err > 0) | |
35331 | + goto out; | |
35332 | + else if (err) | |
35333 | + goto out_err; | |
1facf9fc | 35334 | + } |
35335 | + goto out; /* success */ | |
35336 | + | |
4f0767ce | 35337 | +out_err: |
523b37e3 AM |
35338 | + pr_err("an error(%d) on the writable branch %pd(%s)\n", |
35339 | + err, h_root, au_sbtype(h_root->d_sb)); | |
4f0767ce | 35340 | +out: |
1facf9fc | 35341 | + for (i = 0; i < AuBrWh_Last; i++) |
35342 | + dput(base[i].dentry); | |
35343 | + return err; | |
35344 | +} | |
35345 | + | |
35346 | +/* ---------------------------------------------------------------------- */ | |
35347 | +/* | |
35348 | + * whiteouts are all hard-linked usually. | |
35349 | + * when its link count reaches a ceiling, we create a new whiteout base | |
35350 | + * asynchronously. | |
35351 | + */ | |
35352 | + | |
35353 | +struct reinit_br_wh { | |
35354 | + struct super_block *sb; | |
35355 | + struct au_branch *br; | |
35356 | +}; | |
35357 | + | |
35358 | +static void reinit_br_wh(void *arg) | |
35359 | +{ | |
35360 | + int err; | |
35361 | + aufs_bindex_t bindex; | |
35362 | + struct path h_path; | |
35363 | + struct reinit_br_wh *a = arg; | |
35364 | + struct au_wbr *wbr; | |
523b37e3 | 35365 | + struct inode *dir, *delegated; |
1facf9fc | 35366 | + struct dentry *h_root; |
35367 | + struct au_hinode *hdir; | |
35368 | + | |
35369 | + err = 0; | |
35370 | + wbr = a->br->br_wbr; | |
35371 | + /* big aufs lock */ | |
35372 | + si_noflush_write_lock(a->sb); | |
35373 | + if (!au_br_writable(a->br->br_perm)) | |
35374 | + goto out; | |
35375 | + bindex = au_br_index(a->sb, a->br->br_id); | |
35376 | + if (unlikely(bindex < 0)) | |
35377 | + goto out; | |
35378 | + | |
1308ab2a | 35379 | + di_read_lock_parent(a->sb->s_root, AuLock_IR); |
5527c038 | 35380 | + dir = d_inode(a->sb->s_root); |
1facf9fc | 35381 | + hdir = au_hi(dir, bindex); |
35382 | + h_root = au_h_dptr(a->sb->s_root, bindex); | |
86dc4139 | 35383 | + AuDebugOn(h_root != au_br_dentry(a->br)); |
1facf9fc | 35384 | + |
5afbbe0d | 35385 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 35386 | + wbr_wh_write_lock(wbr); |
35387 | + err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode, | |
35388 | + h_root, a->br); | |
35389 | + if (!err) { | |
86dc4139 AM |
35390 | + h_path.dentry = wbr->wbr_whbase; |
35391 | + h_path.mnt = au_br_mnt(a->br); | |
523b37e3 AM |
35392 | + delegated = NULL; |
35393 | + err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, | |
35394 | + /*force*/0); | |
35395 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35396 | + pr_warn("cannot retry for NFSv4 delegation" | |
35397 | + " for an internal unlink\n"); | |
35398 | + iput(delegated); | |
35399 | + } | |
1facf9fc | 35400 | + } else { |
523b37e3 | 35401 | + pr_warn("%pd is moved, ignored\n", wbr->wbr_whbase); |
1facf9fc | 35402 | + err = 0; |
35403 | + } | |
35404 | + dput(wbr->wbr_whbase); | |
35405 | + wbr->wbr_whbase = NULL; | |
35406 | + if (!err) | |
86dc4139 | 35407 | + err = au_wh_init(a->br, a->sb); |
1facf9fc | 35408 | + wbr_wh_write_unlock(wbr); |
5afbbe0d | 35409 | + au_hn_inode_unlock(hdir); |
1308ab2a | 35410 | + di_read_unlock(a->sb->s_root, AuLock_IR); |
076b876e AM |
35411 | + if (!err) |
35412 | + au_fhsm_wrote(a->sb, bindex, /*force*/0); | |
1facf9fc | 35413 | + |
4f0767ce | 35414 | +out: |
1facf9fc | 35415 | + if (wbr) |
35416 | + atomic_dec(&wbr->wbr_wh_running); | |
acd2b654 | 35417 | + au_lcnt_dec(&a->br->br_count); |
1facf9fc | 35418 | + si_write_unlock(a->sb); |
027c5e7a | 35419 | + au_nwt_done(&au_sbi(a->sb)->si_nowait); |
9f237c51 | 35420 | + au_kfree_rcu(a); |
1facf9fc | 35421 | + if (unlikely(err)) |
35422 | + AuIOErr("err %d\n", err); | |
35423 | +} | |
35424 | + | |
35425 | +static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br) | |
35426 | +{ | |
35427 | + int do_dec, wkq_err; | |
35428 | + struct reinit_br_wh *arg; | |
35429 | + | |
35430 | + do_dec = 1; | |
35431 | + if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1) | |
35432 | + goto out; | |
35433 | + | |
35434 | + /* ignore ENOMEM */ | |
35435 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
35436 | + if (arg) { | |
35437 | + /* | |
35438 | + * dec(wh_running), kfree(arg) and dec(br_count) | |
35439 | + * in reinit function | |
35440 | + */ | |
35441 | + arg->sb = sb; | |
35442 | + arg->br = br; | |
acd2b654 | 35443 | + au_lcnt_inc(&br->br_count); |
53392da6 | 35444 | + wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0); |
1facf9fc | 35445 | + if (unlikely(wkq_err)) { |
35446 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
acd2b654 | 35447 | + au_lcnt_dec(&br->br_count); |
9f237c51 | 35448 | + au_kfree_rcu(arg); |
1facf9fc | 35449 | + } |
35450 | + do_dec = 0; | |
35451 | + } | |
35452 | + | |
4f0767ce | 35453 | +out: |
1facf9fc | 35454 | + if (do_dec) |
35455 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
35456 | +} | |
35457 | + | |
35458 | +/* ---------------------------------------------------------------------- */ | |
35459 | + | |
35460 | +/* | |
35461 | + * create the whiteout @wh. | |
35462 | + */ | |
35463 | +static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex, | |
35464 | + struct dentry *wh) | |
35465 | +{ | |
35466 | + int err; | |
35467 | + struct path h_path = { | |
35468 | + .dentry = wh | |
35469 | + }; | |
35470 | + struct au_branch *br; | |
35471 | + struct au_wbr *wbr; | |
35472 | + struct dentry *h_parent; | |
523b37e3 | 35473 | + struct inode *h_dir, *delegated; |
1facf9fc | 35474 | + |
35475 | + h_parent = wh->d_parent; /* dir inode is locked */ | |
5527c038 | 35476 | + h_dir = d_inode(h_parent); |
1facf9fc | 35477 | + IMustLock(h_dir); |
35478 | + | |
35479 | + br = au_sbr(sb, bindex); | |
86dc4139 | 35480 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 35481 | + wbr = br->br_wbr; |
35482 | + wbr_wh_read_lock(wbr); | |
35483 | + if (wbr->wbr_whbase) { | |
523b37e3 AM |
35484 | + delegated = NULL; |
35485 | + err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path, &delegated); | |
35486 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35487 | + pr_warn("cannot retry for NFSv4 delegation" | |
35488 | + " for an internal link\n"); | |
35489 | + iput(delegated); | |
35490 | + } | |
1facf9fc | 35491 | + if (!err || err != -EMLINK) |
35492 | + goto out; | |
35493 | + | |
35494 | + /* link count full. re-initialize br_whbase. */ | |
35495 | + kick_reinit_br_wh(sb, br); | |
35496 | + } | |
35497 | + | |
35498 | + /* return this error in this context */ | |
b4510431 | 35499 | + err = vfsub_create(h_dir, &h_path, WH_MASK, /*want_excl*/true); |
076b876e AM |
35500 | + if (!err) |
35501 | + au_fhsm_wrote(sb, bindex, /*force*/0); | |
1facf9fc | 35502 | + |
4f0767ce | 35503 | +out: |
1facf9fc | 35504 | + wbr_wh_read_unlock(wbr); |
35505 | + return err; | |
35506 | +} | |
35507 | + | |
35508 | +/* ---------------------------------------------------------------------- */ | |
35509 | + | |
35510 | +/* | |
35511 | + * create or remove the diropq. | |
35512 | + */ | |
35513 | +static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex, | |
35514 | + unsigned int flags) | |
35515 | +{ | |
35516 | + struct dentry *opq_dentry, *h_dentry; | |
35517 | + struct super_block *sb; | |
35518 | + struct au_branch *br; | |
35519 | + int err; | |
35520 | + | |
35521 | + sb = dentry->d_sb; | |
35522 | + br = au_sbr(sb, bindex); | |
35523 | + h_dentry = au_h_dptr(dentry, bindex); | |
b4510431 | 35524 | + opq_dentry = vfsub_lkup_one(&diropq_name, h_dentry); |
1facf9fc | 35525 | + if (IS_ERR(opq_dentry)) |
35526 | + goto out; | |
35527 | + | |
35528 | + if (au_ftest_diropq(flags, CREATE)) { | |
35529 | + err = link_or_create_wh(sb, bindex, opq_dentry); | |
35530 | + if (!err) { | |
35531 | + au_set_dbdiropq(dentry, bindex); | |
35532 | + goto out; /* success */ | |
35533 | + } | |
35534 | + } else { | |
35535 | + struct path tmp = { | |
35536 | + .dentry = opq_dentry, | |
86dc4139 | 35537 | + .mnt = au_br_mnt(br) |
1facf9fc | 35538 | + }; |
5527c038 | 35539 | + err = do_unlink_wh(au_h_iptr(d_inode(dentry), bindex), &tmp); |
1facf9fc | 35540 | + if (!err) |
35541 | + au_set_dbdiropq(dentry, -1); | |
35542 | + } | |
35543 | + dput(opq_dentry); | |
35544 | + opq_dentry = ERR_PTR(err); | |
35545 | + | |
4f0767ce | 35546 | +out: |
1facf9fc | 35547 | + return opq_dentry; |
35548 | +} | |
35549 | + | |
35550 | +struct do_diropq_args { | |
35551 | + struct dentry **errp; | |
35552 | + struct dentry *dentry; | |
35553 | + aufs_bindex_t bindex; | |
35554 | + unsigned int flags; | |
35555 | +}; | |
35556 | + | |
35557 | +static void call_do_diropq(void *args) | |
35558 | +{ | |
35559 | + struct do_diropq_args *a = args; | |
35560 | + *a->errp = do_diropq(a->dentry, a->bindex, a->flags); | |
35561 | +} | |
35562 | + | |
35563 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
35564 | + unsigned int flags) | |
35565 | +{ | |
35566 | + struct dentry *diropq, *h_dentry; | |
35567 | + | |
35568 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 35569 | + if (!au_test_h_perm_sio(d_inode(h_dentry), MAY_EXEC | MAY_WRITE)) |
1facf9fc | 35570 | + diropq = do_diropq(dentry, bindex, flags); |
35571 | + else { | |
35572 | + int wkq_err; | |
35573 | + struct do_diropq_args args = { | |
35574 | + .errp = &diropq, | |
35575 | + .dentry = dentry, | |
35576 | + .bindex = bindex, | |
35577 | + .flags = flags | |
35578 | + }; | |
35579 | + | |
35580 | + wkq_err = au_wkq_wait(call_do_diropq, &args); | |
35581 | + if (unlikely(wkq_err)) | |
35582 | + diropq = ERR_PTR(wkq_err); | |
35583 | + } | |
35584 | + | |
35585 | + return diropq; | |
35586 | +} | |
35587 | + | |
35588 | +/* ---------------------------------------------------------------------- */ | |
35589 | + | |
35590 | +/* | |
35591 | + * lookup whiteout dentry. | |
35592 | + * @h_parent: lower parent dentry which must exist and be locked | |
35593 | + * @base_name: name of dentry which will be whiteouted | |
35594 | + * returns dentry for whiteout. | |
35595 | + */ | |
35596 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
35597 | + struct au_branch *br) | |
35598 | +{ | |
35599 | + int err; | |
35600 | + struct qstr wh_name; | |
35601 | + struct dentry *wh_dentry; | |
35602 | + | |
35603 | + err = au_wh_name_alloc(&wh_name, base_name); | |
35604 | + wh_dentry = ERR_PTR(err); | |
35605 | + if (!err) { | |
b4510431 | 35606 | + wh_dentry = vfsub_lkup_one(&wh_name, h_parent); |
9f237c51 | 35607 | + au_kfree_try_rcu(wh_name.name); |
1facf9fc | 35608 | + } |
35609 | + return wh_dentry; | |
35610 | +} | |
35611 | + | |
35612 | +/* | |
35613 | + * link/create a whiteout for @dentry on @bindex. | |
35614 | + */ | |
35615 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
35616 | + struct dentry *h_parent) | |
35617 | +{ | |
35618 | + struct dentry *wh_dentry; | |
35619 | + struct super_block *sb; | |
35620 | + int err; | |
35621 | + | |
35622 | + sb = dentry->d_sb; | |
35623 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex)); | |
5527c038 | 35624 | + if (!IS_ERR(wh_dentry) && d_is_negative(wh_dentry)) { |
1facf9fc | 35625 | + err = link_or_create_wh(sb, bindex, wh_dentry); |
076b876e | 35626 | + if (!err) { |
1facf9fc | 35627 | + au_set_dbwh(dentry, bindex); |
076b876e AM |
35628 | + au_fhsm_wrote(sb, bindex, /*force*/0); |
35629 | + } else { | |
1facf9fc | 35630 | + dput(wh_dentry); |
35631 | + wh_dentry = ERR_PTR(err); | |
35632 | + } | |
35633 | + } | |
35634 | + | |
35635 | + return wh_dentry; | |
35636 | +} | |
35637 | + | |
35638 | +/* ---------------------------------------------------------------------- */ | |
35639 | + | |
35640 | +/* Delete all whiteouts in this directory on branch bindex. */ | |
35641 | +static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist, | |
35642 | + aufs_bindex_t bindex, struct au_branch *br) | |
35643 | +{ | |
35644 | + int err; | |
35645 | + unsigned long ul, n; | |
35646 | + struct qstr wh_name; | |
35647 | + char *p; | |
35648 | + struct hlist_head *head; | |
c06a8ce3 | 35649 | + struct au_vdir_wh *pos; |
1facf9fc | 35650 | + struct au_vdir_destr *str; |
35651 | + | |
35652 | + err = -ENOMEM; | |
537831f9 | 35653 | + p = (void *)__get_free_page(GFP_NOFS); |
1facf9fc | 35654 | + wh_name.name = p; |
35655 | + if (unlikely(!wh_name.name)) | |
35656 | + goto out; | |
35657 | + | |
35658 | + err = 0; | |
35659 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
35660 | + p += AUFS_WH_PFX_LEN; | |
35661 | + n = whlist->nh_num; | |
35662 | + head = whlist->nh_head; | |
35663 | + for (ul = 0; !err && ul < n; ul++, head++) { | |
c06a8ce3 AM |
35664 | + hlist_for_each_entry(pos, head, wh_hash) { |
35665 | + if (pos->wh_bindex != bindex) | |
1facf9fc | 35666 | + continue; |
35667 | + | |
c06a8ce3 | 35668 | + str = &pos->wh_str; |
1facf9fc | 35669 | + if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) { |
35670 | + memcpy(p, str->name, str->len); | |
35671 | + wh_name.len = AUFS_WH_PFX_LEN + str->len; | |
35672 | + err = unlink_wh_name(h_dentry, &wh_name, br); | |
35673 | + if (!err) | |
35674 | + continue; | |
35675 | + break; | |
35676 | + } | |
35677 | + AuIOErr("whiteout name too long %.*s\n", | |
35678 | + str->len, str->name); | |
35679 | + err = -EIO; | |
35680 | + break; | |
35681 | + } | |
35682 | + } | |
1c60b727 | 35683 | + free_page((unsigned long)wh_name.name); |
1facf9fc | 35684 | + |
4f0767ce | 35685 | +out: |
1facf9fc | 35686 | + return err; |
35687 | +} | |
35688 | + | |
35689 | +struct del_wh_children_args { | |
35690 | + int *errp; | |
35691 | + struct dentry *h_dentry; | |
1308ab2a | 35692 | + struct au_nhash *whlist; |
1facf9fc | 35693 | + aufs_bindex_t bindex; |
35694 | + struct au_branch *br; | |
35695 | +}; | |
35696 | + | |
35697 | +static void call_del_wh_children(void *args) | |
35698 | +{ | |
35699 | + struct del_wh_children_args *a = args; | |
1308ab2a | 35700 | + *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br); |
1facf9fc | 35701 | +} |
35702 | + | |
35703 | +/* ---------------------------------------------------------------------- */ | |
35704 | + | |
35705 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp) | |
35706 | +{ | |
35707 | + struct au_whtmp_rmdir *whtmp; | |
dece6358 | 35708 | + int err; |
1308ab2a | 35709 | + unsigned int rdhash; |
dece6358 AM |
35710 | + |
35711 | + SiMustAnyLock(sb); | |
1facf9fc | 35712 | + |
be52b249 | 35713 | + whtmp = kzalloc(sizeof(*whtmp), gfp); |
dece6358 AM |
35714 | + if (unlikely(!whtmp)) { |
35715 | + whtmp = ERR_PTR(-ENOMEM); | |
1facf9fc | 35716 | + goto out; |
dece6358 | 35717 | + } |
1facf9fc | 35718 | + |
1308ab2a | 35719 | + /* no estimation for dir size */ |
35720 | + rdhash = au_sbi(sb)->si_rdhash; | |
35721 | + if (!rdhash) | |
35722 | + rdhash = AUFS_RDHASH_DEF; | |
35723 | + err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp); | |
35724 | + if (unlikely(err)) { | |
9f237c51 | 35725 | + au_kfree_rcu(whtmp); |
1308ab2a | 35726 | + whtmp = ERR_PTR(err); |
35727 | + } | |
dece6358 | 35728 | + |
4f0767ce | 35729 | +out: |
dece6358 | 35730 | + return whtmp; |
1facf9fc | 35731 | +} |
35732 | + | |
35733 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp) | |
35734 | +{ | |
027c5e7a | 35735 | + if (whtmp->br) |
acd2b654 | 35736 | + au_lcnt_dec(&whtmp->br->br_count); |
1facf9fc | 35737 | + dput(whtmp->wh_dentry); |
35738 | + iput(whtmp->dir); | |
dece6358 | 35739 | + au_nhash_wh_free(&whtmp->whlist); |
9f237c51 | 35740 | + au_kfree_rcu(whtmp); |
1facf9fc | 35741 | +} |
35742 | + | |
35743 | +/* | |
35744 | + * rmdir the whiteouted temporary named dir @h_dentry. | |
35745 | + * @whlist: whiteouted children. | |
35746 | + */ | |
35747 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35748 | + struct dentry *wh_dentry, struct au_nhash *whlist) | |
35749 | +{ | |
35750 | + int err; | |
2000de60 | 35751 | + unsigned int h_nlink; |
1facf9fc | 35752 | + struct path h_tmp; |
35753 | + struct inode *wh_inode, *h_dir; | |
35754 | + struct au_branch *br; | |
35755 | + | |
5527c038 | 35756 | + h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ |
1facf9fc | 35757 | + IMustLock(h_dir); |
35758 | + | |
35759 | + br = au_sbr(dir->i_sb, bindex); | |
5527c038 | 35760 | + wh_inode = d_inode(wh_dentry); |
febd17d6 | 35761 | + inode_lock_nested(wh_inode, AuLsc_I_CHILD); |
1facf9fc | 35762 | + |
35763 | + /* | |
35764 | + * someone else might change some whiteouts while we were sleeping. | |
35765 | + * it means this whlist may have an obsoleted entry. | |
35766 | + */ | |
35767 | + if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE)) | |
35768 | + err = del_wh_children(wh_dentry, whlist, bindex, br); | |
35769 | + else { | |
35770 | + int wkq_err; | |
35771 | + struct del_wh_children_args args = { | |
35772 | + .errp = &err, | |
35773 | + .h_dentry = wh_dentry, | |
1308ab2a | 35774 | + .whlist = whlist, |
1facf9fc | 35775 | + .bindex = bindex, |
35776 | + .br = br | |
35777 | + }; | |
35778 | + | |
35779 | + wkq_err = au_wkq_wait(call_del_wh_children, &args); | |
35780 | + if (unlikely(wkq_err)) | |
35781 | + err = wkq_err; | |
35782 | + } | |
febd17d6 | 35783 | + inode_unlock(wh_inode); |
1facf9fc | 35784 | + |
35785 | + if (!err) { | |
35786 | + h_tmp.dentry = wh_dentry; | |
86dc4139 | 35787 | + h_tmp.mnt = au_br_mnt(br); |
2000de60 | 35788 | + h_nlink = h_dir->i_nlink; |
1facf9fc | 35789 | + err = vfsub_rmdir(h_dir, &h_tmp); |
2000de60 JR |
35790 | + /* some fs doesn't change the parent nlink in some cases */ |
35791 | + h_nlink -= h_dir->i_nlink; | |
1facf9fc | 35792 | + } |
35793 | + | |
35794 | + if (!err) { | |
5afbbe0d | 35795 | + if (au_ibtop(dir) == bindex) { |
7f207e10 | 35796 | + /* todo: dir->i_mutex is necessary */ |
1facf9fc | 35797 | + au_cpup_attr_timesizes(dir); |
2000de60 JR |
35798 | + if (h_nlink) |
35799 | + vfsub_drop_nlink(dir); | |
1facf9fc | 35800 | + } |
35801 | + return 0; /* success */ | |
35802 | + } | |
35803 | + | |
523b37e3 | 35804 | + pr_warn("failed removing %pd(%d), ignored\n", wh_dentry, err); |
1facf9fc | 35805 | + return err; |
35806 | +} | |
35807 | + | |
35808 | +static void call_rmdir_whtmp(void *args) | |
35809 | +{ | |
35810 | + int err; | |
e49829fe | 35811 | + aufs_bindex_t bindex; |
1facf9fc | 35812 | + struct au_whtmp_rmdir *a = args; |
35813 | + struct super_block *sb; | |
35814 | + struct dentry *h_parent; | |
35815 | + struct inode *h_dir; | |
1facf9fc | 35816 | + struct au_hinode *hdir; |
35817 | + | |
35818 | + /* rmdir by nfsd may cause deadlock with this i_mutex */ | |
febd17d6 | 35819 | + /* inode_lock(a->dir); */ |
e49829fe | 35820 | + err = -EROFS; |
1facf9fc | 35821 | + sb = a->dir->i_sb; |
e49829fe JR |
35822 | + si_read_lock(sb, !AuLock_FLUSH); |
35823 | + if (!au_br_writable(a->br->br_perm)) | |
35824 | + goto out; | |
35825 | + bindex = au_br_index(sb, a->br->br_id); | |
35826 | + if (unlikely(bindex < 0)) | |
1facf9fc | 35827 | + goto out; |
35828 | + | |
35829 | + err = -EIO; | |
1facf9fc | 35830 | + ii_write_lock_parent(a->dir); |
35831 | + h_parent = dget_parent(a->wh_dentry); | |
5527c038 | 35832 | + h_dir = d_inode(h_parent); |
e49829fe | 35833 | + hdir = au_hi(a->dir, bindex); |
86dc4139 AM |
35834 | + err = vfsub_mnt_want_write(au_br_mnt(a->br)); |
35835 | + if (unlikely(err)) | |
35836 | + goto out_mnt; | |
5afbbe0d | 35837 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
e49829fe JR |
35838 | + err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, |
35839 | + a->br); | |
86dc4139 AM |
35840 | + if (!err) |
35841 | + err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, &a->whlist); | |
5afbbe0d | 35842 | + au_hn_inode_unlock(hdir); |
86dc4139 AM |
35843 | + vfsub_mnt_drop_write(au_br_mnt(a->br)); |
35844 | + | |
35845 | +out_mnt: | |
1facf9fc | 35846 | + dput(h_parent); |
35847 | + ii_write_unlock(a->dir); | |
4f0767ce | 35848 | +out: |
febd17d6 | 35849 | + /* inode_unlock(a->dir); */ |
1facf9fc | 35850 | + au_whtmp_rmdir_free(a); |
027c5e7a AM |
35851 | + si_read_unlock(sb); |
35852 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
1facf9fc | 35853 | + if (unlikely(err)) |
35854 | + AuIOErr("err %d\n", err); | |
35855 | +} | |
35856 | + | |
35857 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35858 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args) | |
35859 | +{ | |
35860 | + int wkq_err; | |
e49829fe | 35861 | + struct super_block *sb; |
1facf9fc | 35862 | + |
35863 | + IMustLock(dir); | |
35864 | + | |
35865 | + /* all post-process will be done in do_rmdir_whtmp(). */ | |
e49829fe | 35866 | + sb = dir->i_sb; |
1facf9fc | 35867 | + args->dir = au_igrab(dir); |
e49829fe | 35868 | + args->br = au_sbr(sb, bindex); |
acd2b654 | 35869 | + au_lcnt_inc(&args->br->br_count); |
1facf9fc | 35870 | + args->wh_dentry = dget(wh_dentry); |
53392da6 | 35871 | + wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0); |
1facf9fc | 35872 | + if (unlikely(wkq_err)) { |
523b37e3 | 35873 | + pr_warn("rmdir error %pd (%d), ignored\n", wh_dentry, wkq_err); |
1facf9fc | 35874 | + au_whtmp_rmdir_free(args); |
35875 | + } | |
35876 | +} | |
7f207e10 | 35877 | diff -urN /usr/share/empty/fs/aufs/whout.h linux/fs/aufs/whout.h |
eca34b5c | 35878 | --- /usr/share/empty/fs/aufs/whout.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 35879 | +++ linux/fs/aufs/whout.h 2020-01-27 10:57:18.178871751 +0100 |
062440b3 AM |
35880 | @@ -0,0 +1,86 @@ |
35881 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 35882 | +/* |
016522bc | 35883 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 35884 | + * |
35885 | + * This program, aufs is free software; you can redistribute it and/or modify | |
35886 | + * it under the terms of the GNU General Public License as published by | |
35887 | + * the Free Software Foundation; either version 2 of the License, or | |
35888 | + * (at your option) any later version. | |
dece6358 AM |
35889 | + * |
35890 | + * This program is distributed in the hope that it will be useful, | |
35891 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
35892 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
35893 | + * GNU General Public License for more details. | |
35894 | + * | |
35895 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 35896 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 35897 | + */ |
35898 | + | |
35899 | +/* | |
35900 | + * whiteout for logical deletion and opaque directory | |
35901 | + */ | |
35902 | + | |
35903 | +#ifndef __AUFS_WHOUT_H__ | |
35904 | +#define __AUFS_WHOUT_H__ | |
35905 | + | |
35906 | +#ifdef __KERNEL__ | |
35907 | + | |
1facf9fc | 35908 | +#include "dir.h" |
35909 | + | |
35910 | +/* whout.c */ | |
35911 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); | |
076b876e AM |
35912 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio); |
35913 | +int au_diropq_test(struct dentry *h_dentry); | |
3c1bdaff | 35914 | +struct au_branch; |
1facf9fc | 35915 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, |
35916 | + struct qstr *prefix); | |
35917 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); | |
35918 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
35919 | + struct dentry *dentry); | |
86dc4139 | 35920 | +int au_wh_init(struct au_branch *br, struct super_block *sb); |
1facf9fc | 35921 | + |
35922 | +/* diropq flags */ | |
35923 | +#define AuDiropq_CREATE 1 | |
35924 | +#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) | |
7f207e10 AM |
35925 | +#define au_fset_diropq(flags, name) \ |
35926 | + do { (flags) |= AuDiropq_##name; } while (0) | |
35927 | +#define au_fclr_diropq(flags, name) \ | |
35928 | + do { (flags) &= ~AuDiropq_##name; } while (0) | |
1facf9fc | 35929 | + |
35930 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
35931 | + unsigned int flags); | |
35932 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
35933 | + struct au_branch *br); | |
35934 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
35935 | + struct dentry *h_parent); | |
35936 | + | |
35937 | +/* real rmdir for the whiteout-ed dir */ | |
35938 | +struct au_whtmp_rmdir { | |
35939 | + struct inode *dir; | |
e49829fe | 35940 | + struct au_branch *br; |
1facf9fc | 35941 | + struct dentry *wh_dentry; |
dece6358 | 35942 | + struct au_nhash whlist; |
1facf9fc | 35943 | +}; |
35944 | + | |
35945 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); | |
35946 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); | |
35947 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35948 | + struct dentry *wh_dentry, struct au_nhash *whlist); | |
35949 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35950 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args); | |
35951 | + | |
35952 | +/* ---------------------------------------------------------------------- */ | |
35953 | + | |
35954 | +static inline struct dentry *au_diropq_create(struct dentry *dentry, | |
35955 | + aufs_bindex_t bindex) | |
35956 | +{ | |
35957 | + return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); | |
35958 | +} | |
35959 | + | |
35960 | +static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) | |
35961 | +{ | |
35962 | + return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); | |
35963 | +} | |
35964 | + | |
35965 | +#endif /* __KERNEL__ */ | |
35966 | +#endif /* __AUFS_WHOUT_H__ */ | |
7f207e10 | 35967 | diff -urN /usr/share/empty/fs/aufs/wkq.c linux/fs/aufs/wkq.c |
eca34b5c | 35968 | --- /usr/share/empty/fs/aufs/wkq.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 35969 | +++ linux/fs/aufs/wkq.c 2020-04-03 08:16:47.547461775 +0200 |
43982f53 | 35970 | @@ -0,0 +1,372 @@ |
cd7a4cd9 | 35971 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 35972 | +/* |
016522bc | 35973 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 35974 | + * |
35975 | + * This program, aufs is free software; you can redistribute it and/or modify | |
35976 | + * it under the terms of the GNU General Public License as published by | |
35977 | + * the Free Software Foundation; either version 2 of the License, or | |
35978 | + * (at your option) any later version. | |
dece6358 AM |
35979 | + * |
35980 | + * This program is distributed in the hope that it will be useful, | |
35981 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
35982 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
35983 | + * GNU General Public License for more details. | |
35984 | + * | |
35985 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 35986 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 35987 | + */ |
35988 | + | |
35989 | +/* | |
35990 | + * workqueue for asynchronous/super-io operations | |
acd2b654 | 35991 | + * todo: try new credential scheme |
1facf9fc | 35992 | + */ |
35993 | + | |
dece6358 | 35994 | +#include <linux/module.h> |
1facf9fc | 35995 | +#include "aufs.h" |
35996 | + | |
9dbd164d | 35997 | +/* internal workqueue named AUFS_WKQ_NAME */ |
b752ccd1 | 35998 | + |
9dbd164d | 35999 | +static struct workqueue_struct *au_wkq; |
1facf9fc | 36000 | + |
36001 | +struct au_wkinfo { | |
36002 | + struct work_struct wk; | |
7f207e10 | 36003 | + struct kobject *kobj; |
1facf9fc | 36004 | + |
36005 | + unsigned int flags; /* see wkq.h */ | |
36006 | + | |
36007 | + au_wkq_func_t func; | |
36008 | + void *args; | |
36009 | + | |
8b6a4947 AM |
36010 | +#ifdef CONFIG_LOCKDEP |
36011 | + int dont_check; | |
36012 | + struct held_lock **hlock; | |
36013 | +#endif | |
36014 | + | |
1facf9fc | 36015 | + struct completion *comp; |
36016 | +}; | |
36017 | + | |
36018 | +/* ---------------------------------------------------------------------- */ | |
8b6a4947 AM |
36019 | +/* |
36020 | + * Aufs passes some operations to the workqueue such as the internal copyup. | |
36021 | + * This scheme looks rather unnatural for LOCKDEP debugging feature, since the | |
36022 | + * job run by workqueue depends upon the locks acquired in the other task. | |
36023 | + * Delegating a small operation to the workqueue, aufs passes its lockdep | |
36024 | + * information too. And the job in the workqueue restores the info in order to | |
36025 | + * pretend as if it acquired those locks. This is just to make LOCKDEP work | |
36026 | + * correctly and expectedly. | |
36027 | + */ | |
36028 | + | |
36029 | +#ifndef CONFIG_LOCKDEP | |
36030 | +AuStubInt0(au_wkq_lockdep_alloc, struct au_wkinfo *wkinfo); | |
36031 | +AuStubVoid(au_wkq_lockdep_free, struct au_wkinfo *wkinfo); | |
36032 | +AuStubVoid(au_wkq_lockdep_pre, struct au_wkinfo *wkinfo); | |
36033 | +AuStubVoid(au_wkq_lockdep_post, struct au_wkinfo *wkinfo); | |
36034 | +AuStubVoid(au_wkq_lockdep_init, struct au_wkinfo *wkinfo); | |
36035 | +#else | |
36036 | +static void au_wkq_lockdep_init(struct au_wkinfo *wkinfo) | |
36037 | +{ | |
36038 | + wkinfo->hlock = NULL; | |
36039 | + wkinfo->dont_check = 0; | |
36040 | +} | |
36041 | + | |
36042 | +/* | |
36043 | + * 1: matched | |
36044 | + * 0: unmatched | |
36045 | + */ | |
36046 | +static int au_wkq_lockdep_test(struct lock_class_key *key, const char *name) | |
36047 | +{ | |
36048 | + static DEFINE_SPINLOCK(spin); | |
36049 | + static struct { | |
36050 | + char *name; | |
36051 | + struct lock_class_key *key; | |
36052 | + } a[] = { | |
36053 | + { .name = "&sbinfo->si_rwsem" }, | |
36054 | + { .name = "&finfo->fi_rwsem" }, | |
36055 | + { .name = "&dinfo->di_rwsem" }, | |
36056 | + { .name = "&iinfo->ii_rwsem" } | |
36057 | + }; | |
36058 | + static int set; | |
36059 | + int i; | |
36060 | + | |
36061 | + /* lockless read from 'set.' see below */ | |
36062 | + if (set == ARRAY_SIZE(a)) { | |
36063 | + for (i = 0; i < ARRAY_SIZE(a); i++) | |
36064 | + if (a[i].key == key) | |
36065 | + goto match; | |
36066 | + goto unmatch; | |
36067 | + } | |
36068 | + | |
36069 | + spin_lock(&spin); | |
36070 | + if (set) | |
36071 | + for (i = 0; i < ARRAY_SIZE(a); i++) | |
36072 | + if (a[i].key == key) { | |
36073 | + spin_unlock(&spin); | |
36074 | + goto match; | |
36075 | + } | |
36076 | + for (i = 0; i < ARRAY_SIZE(a); i++) { | |
36077 | + if (a[i].key) { | |
36078 | + if (unlikely(a[i].key == key)) { /* rare but possible */ | |
36079 | + spin_unlock(&spin); | |
36080 | + goto match; | |
36081 | + } else | |
36082 | + continue; | |
36083 | + } | |
36084 | + if (strstr(a[i].name, name)) { | |
36085 | + /* | |
36086 | + * the order of these three lines is important for the | |
36087 | + * lockless read above. | |
36088 | + */ | |
36089 | + a[i].key = key; | |
36090 | + spin_unlock(&spin); | |
36091 | + set++; | |
36092 | + /* AuDbg("%d, %s\n", set, name); */ | |
36093 | + goto match; | |
36094 | + } | |
36095 | + } | |
36096 | + spin_unlock(&spin); | |
36097 | + goto unmatch; | |
36098 | + | |
36099 | +match: | |
36100 | + return 1; | |
36101 | +unmatch: | |
36102 | + return 0; | |
36103 | +} | |
36104 | + | |
36105 | +static int au_wkq_lockdep_alloc(struct au_wkinfo *wkinfo) | |
36106 | +{ | |
36107 | + int err, n; | |
36108 | + struct task_struct *curr; | |
36109 | + struct held_lock **hl, *held_locks, *p; | |
36110 | + | |
36111 | + err = 0; | |
36112 | + curr = current; | |
36113 | + wkinfo->dont_check = lockdep_recursing(curr); | |
36114 | + if (wkinfo->dont_check) | |
36115 | + goto out; | |
36116 | + n = curr->lockdep_depth; | |
36117 | + if (!n) | |
36118 | + goto out; | |
36119 | + | |
36120 | + err = -ENOMEM; | |
36121 | + wkinfo->hlock = kmalloc_array(n + 1, sizeof(*wkinfo->hlock), GFP_NOFS); | |
36122 | + if (unlikely(!wkinfo->hlock)) | |
36123 | + goto out; | |
36124 | + | |
36125 | + err = 0; | |
43982f53 AM |
36126 | +#if 0 /* left for debugging */ |
36127 | + if (0 && au_debug_test()) | |
8b6a4947 AM |
36128 | + lockdep_print_held_locks(curr); |
36129 | +#endif | |
36130 | + held_locks = curr->held_locks; | |
36131 | + hl = wkinfo->hlock; | |
36132 | + while (n--) { | |
36133 | + p = held_locks++; | |
36134 | + if (au_wkq_lockdep_test(p->instance->key, p->instance->name)) | |
36135 | + *hl++ = p; | |
36136 | + } | |
36137 | + *hl = NULL; | |
36138 | + | |
36139 | +out: | |
36140 | + return err; | |
36141 | +} | |
36142 | + | |
36143 | +static void au_wkq_lockdep_free(struct au_wkinfo *wkinfo) | |
36144 | +{ | |
9f237c51 | 36145 | + au_kfree_try_rcu(wkinfo->hlock); |
8b6a4947 AM |
36146 | +} |
36147 | + | |
36148 | +static void au_wkq_lockdep_pre(struct au_wkinfo *wkinfo) | |
36149 | +{ | |
36150 | + struct held_lock *p, **hl = wkinfo->hlock; | |
36151 | + int subclass; | |
36152 | + | |
36153 | + if (wkinfo->dont_check) | |
36154 | + lockdep_off(); | |
36155 | + if (!hl) | |
36156 | + return; | |
36157 | + while ((p = *hl++)) { /* assignment */ | |
36158 | + subclass = lockdep_hlock_class(p)->subclass; | |
36159 | + /* AuDbg("%s, %d\n", p->instance->name, subclass); */ | |
36160 | + if (p->read) | |
36161 | + rwsem_acquire_read(p->instance, subclass, 0, | |
36162 | + /*p->acquire_ip*/_RET_IP_); | |
36163 | + else | |
36164 | + rwsem_acquire(p->instance, subclass, 0, | |
36165 | + /*p->acquire_ip*/_RET_IP_); | |
36166 | + } | |
36167 | +} | |
36168 | + | |
36169 | +static void au_wkq_lockdep_post(struct au_wkinfo *wkinfo) | |
36170 | +{ | |
36171 | + struct held_lock *p, **hl = wkinfo->hlock; | |
36172 | + | |
36173 | + if (wkinfo->dont_check) | |
36174 | + lockdep_on(); | |
36175 | + if (!hl) | |
36176 | + return; | |
36177 | + while ((p = *hl++)) /* assignment */ | |
36178 | + rwsem_release(p->instance, 0, /*p->acquire_ip*/_RET_IP_); | |
36179 | +} | |
36180 | +#endif | |
1facf9fc | 36181 | + |
1facf9fc | 36182 | +static void wkq_func(struct work_struct *wk) |
36183 | +{ | |
36184 | + struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk); | |
36185 | + | |
2dfbb274 | 36186 | + AuDebugOn(!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)); |
7f207e10 AM |
36187 | + AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY); |
36188 | + | |
8b6a4947 | 36189 | + au_wkq_lockdep_pre(wkinfo); |
1facf9fc | 36190 | + wkinfo->func(wkinfo->args); |
8b6a4947 | 36191 | + au_wkq_lockdep_post(wkinfo); |
1facf9fc | 36192 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) |
36193 | + complete(wkinfo->comp); | |
36194 | + else { | |
7f207e10 | 36195 | + kobject_put(wkinfo->kobj); |
9dbd164d | 36196 | + module_put(THIS_MODULE); /* todo: ?? */ |
9f237c51 | 36197 | + au_kfree_rcu(wkinfo); |
1facf9fc | 36198 | + } |
36199 | +} | |
36200 | + | |
36201 | +/* | |
36202 | + * Since struct completion is large, try allocating it dynamically. | |
36203 | + */ | |
1facf9fc | 36204 | +#define AuWkqCompDeclare(name) struct completion *comp = NULL |
36205 | + | |
36206 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
36207 | +{ | |
36208 | + *comp = kmalloc(sizeof(**comp), GFP_NOFS); | |
36209 | + if (*comp) { | |
36210 | + init_completion(*comp); | |
36211 | + wkinfo->comp = *comp; | |
36212 | + return 0; | |
36213 | + } | |
36214 | + return -ENOMEM; | |
36215 | +} | |
36216 | + | |
36217 | +static void au_wkq_comp_free(struct completion *comp) | |
36218 | +{ | |
9f237c51 | 36219 | + au_kfree_rcu(comp); |
1facf9fc | 36220 | +} |
36221 | + | |
53392da6 | 36222 | +static void au_wkq_run(struct au_wkinfo *wkinfo) |
1facf9fc | 36223 | +{ |
53392da6 AM |
36224 | + if (au_ftest_wkq(wkinfo->flags, NEST)) { |
36225 | + if (au_wkq_test()) { | |
38d290e6 | 36226 | + AuWarn1("wkq from wkq, unless silly-rename on NFS," |
acd2b654 AM |
36227 | + " due to a dead dir by UDBA," |
36228 | + " or async xino write?\n"); | |
53392da6 AM |
36229 | + AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT)); |
36230 | + } | |
36231 | + } else | |
36232 | + au_dbg_verify_kthread(); | |
36233 | + | |
36234 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) { | |
a1f66529 | 36235 | + INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func); |
9dbd164d | 36236 | + queue_work(au_wkq, &wkinfo->wk); |
4a4d8108 AM |
36237 | + } else { |
36238 | + INIT_WORK(&wkinfo->wk, wkq_func); | |
36239 | + schedule_work(&wkinfo->wk); | |
36240 | + } | |
1facf9fc | 36241 | +} |
36242 | + | |
7f207e10 AM |
36243 | +/* |
36244 | + * Be careful. It is easy to make deadlock happen. | |
36245 | + * processA: lock, wkq and wait | |
36246 | + * processB: wkq and wait, lock in wkq | |
36247 | + * --> deadlock | |
36248 | + */ | |
b752ccd1 | 36249 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args) |
1facf9fc | 36250 | +{ |
36251 | + int err; | |
36252 | + AuWkqCompDeclare(comp); | |
36253 | + struct au_wkinfo wkinfo = { | |
b752ccd1 | 36254 | + .flags = flags, |
1facf9fc | 36255 | + .func = func, |
36256 | + .args = args | |
36257 | + }; | |
36258 | + | |
36259 | + err = au_wkq_comp_alloc(&wkinfo, &comp); | |
8b6a4947 AM |
36260 | + if (unlikely(err)) |
36261 | + goto out; | |
36262 | + err = au_wkq_lockdep_alloc(&wkinfo); | |
36263 | + if (unlikely(err)) | |
36264 | + goto out_comp; | |
1facf9fc | 36265 | + if (!err) { |
53392da6 | 36266 | + au_wkq_run(&wkinfo); |
1facf9fc | 36267 | + /* no timeout, no interrupt */ |
36268 | + wait_for_completion(wkinfo.comp); | |
1facf9fc | 36269 | + } |
8b6a4947 | 36270 | + au_wkq_lockdep_free(&wkinfo); |
1facf9fc | 36271 | + |
8b6a4947 AM |
36272 | +out_comp: |
36273 | + au_wkq_comp_free(comp); | |
36274 | +out: | |
36275 | + destroy_work_on_stack(&wkinfo.wk); | |
1facf9fc | 36276 | + return err; |
1facf9fc | 36277 | +} |
36278 | + | |
027c5e7a AM |
36279 | +/* |
36280 | + * Note: dget/dput() in func for aufs dentries are not supported. It will be a | |
36281 | + * problem in a concurrent umounting. | |
36282 | + */ | |
53392da6 AM |
36283 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
36284 | + unsigned int flags) | |
1facf9fc | 36285 | +{ |
36286 | + int err; | |
36287 | + struct au_wkinfo *wkinfo; | |
36288 | + | |
f0c0a007 | 36289 | + atomic_inc(&au_sbi(sb)->si_nowait.nw_len); |
1facf9fc | 36290 | + |
36291 | + /* | |
36292 | + * wkq_func() must free this wkinfo. | |
36293 | + * it highly depends upon the implementation of workqueue. | |
36294 | + */ | |
36295 | + err = 0; | |
36296 | + wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS); | |
36297 | + if (wkinfo) { | |
7f207e10 | 36298 | + wkinfo->kobj = &au_sbi(sb)->si_kobj; |
53392da6 | 36299 | + wkinfo->flags = flags & ~AuWkq_WAIT; |
1facf9fc | 36300 | + wkinfo->func = func; |
36301 | + wkinfo->args = args; | |
36302 | + wkinfo->comp = NULL; | |
8b6a4947 | 36303 | + au_wkq_lockdep_init(wkinfo); |
7f207e10 | 36304 | + kobject_get(wkinfo->kobj); |
9dbd164d | 36305 | + __module_get(THIS_MODULE); /* todo: ?? */ |
1facf9fc | 36306 | + |
53392da6 | 36307 | + au_wkq_run(wkinfo); |
1facf9fc | 36308 | + } else { |
36309 | + err = -ENOMEM; | |
e49829fe | 36310 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
1facf9fc | 36311 | + } |
36312 | + | |
36313 | + return err; | |
36314 | +} | |
36315 | + | |
36316 | +/* ---------------------------------------------------------------------- */ | |
36317 | + | |
36318 | +void au_nwt_init(struct au_nowait_tasks *nwt) | |
36319 | +{ | |
f0c0a007 AM |
36320 | + atomic_set(&nwt->nw_len, 0); |
36321 | + /* smp_mb(); */ /* atomic_set */ | |
1facf9fc | 36322 | + init_waitqueue_head(&nwt->nw_wq); |
36323 | +} | |
36324 | + | |
36325 | +void au_wkq_fin(void) | |
36326 | +{ | |
9dbd164d | 36327 | + destroy_workqueue(au_wkq); |
1facf9fc | 36328 | +} |
36329 | + | |
36330 | +int __init au_wkq_init(void) | |
36331 | +{ | |
9dbd164d | 36332 | + int err; |
b752ccd1 AM |
36333 | + |
36334 | + err = 0; | |
86dc4139 | 36335 | + au_wkq = alloc_workqueue(AUFS_WKQ_NAME, 0, WQ_DFL_ACTIVE); |
9dbd164d AM |
36336 | + if (IS_ERR(au_wkq)) |
36337 | + err = PTR_ERR(au_wkq); | |
36338 | + else if (!au_wkq) | |
36339 | + err = -ENOMEM; | |
b752ccd1 AM |
36340 | + |
36341 | + return err; | |
1facf9fc | 36342 | +} |
7f207e10 | 36343 | diff -urN /usr/share/empty/fs/aufs/wkq.h linux/fs/aufs/wkq.h |
eca34b5c | 36344 | --- /usr/share/empty/fs/aufs/wkq.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 36345 | +++ linux/fs/aufs/wkq.h 2020-01-27 10:57:18.182205184 +0100 |
acd2b654 | 36346 | @@ -0,0 +1,89 @@ |
062440b3 | 36347 | +/* SPDX-License-Identifier: GPL-2.0 */ |
1facf9fc | 36348 | +/* |
016522bc | 36349 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 36350 | + * |
36351 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36352 | + * it under the terms of the GNU General Public License as published by | |
36353 | + * the Free Software Foundation; either version 2 of the License, or | |
36354 | + * (at your option) any later version. | |
dece6358 AM |
36355 | + * |
36356 | + * This program is distributed in the hope that it will be useful, | |
36357 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36358 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36359 | + * GNU General Public License for more details. | |
36360 | + * | |
36361 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 36362 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 36363 | + */ |
36364 | + | |
36365 | +/* | |
36366 | + * workqueue for asynchronous/super-io operations | |
36367 | + * todo: try new credentials management scheme | |
36368 | + */ | |
36369 | + | |
36370 | +#ifndef __AUFS_WKQ_H__ | |
36371 | +#define __AUFS_WKQ_H__ | |
36372 | + | |
36373 | +#ifdef __KERNEL__ | |
36374 | + | |
8b6a4947 | 36375 | +#include <linux/wait.h> |
5afbbe0d | 36376 | + |
dece6358 AM |
36377 | +struct super_block; |
36378 | + | |
1facf9fc | 36379 | +/* ---------------------------------------------------------------------- */ |
36380 | + | |
36381 | +/* | |
36382 | + * in the next operation, wait for the 'nowait' tasks in system-wide workqueue | |
36383 | + */ | |
36384 | +struct au_nowait_tasks { | |
f0c0a007 | 36385 | + atomic_t nw_len; |
1facf9fc | 36386 | + wait_queue_head_t nw_wq; |
36387 | +}; | |
36388 | + | |
36389 | +/* ---------------------------------------------------------------------- */ | |
36390 | + | |
36391 | +typedef void (*au_wkq_func_t)(void *args); | |
36392 | + | |
36393 | +/* wkq flags */ | |
36394 | +#define AuWkq_WAIT 1 | |
9dbd164d | 36395 | +#define AuWkq_NEST (1 << 1) |
1facf9fc | 36396 | +#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) |
7f207e10 AM |
36397 | +#define au_fset_wkq(flags, name) \ |
36398 | + do { (flags) |= AuWkq_##name; } while (0) | |
36399 | +#define au_fclr_wkq(flags, name) \ | |
36400 | + do { (flags) &= ~AuWkq_##name; } while (0) | |
1facf9fc | 36401 | + |
36402 | +/* wkq.c */ | |
b752ccd1 | 36403 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); |
53392da6 AM |
36404 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
36405 | + unsigned int flags); | |
1facf9fc | 36406 | +void au_nwt_init(struct au_nowait_tasks *nwt); |
36407 | +int __init au_wkq_init(void); | |
36408 | +void au_wkq_fin(void); | |
36409 | + | |
36410 | +/* ---------------------------------------------------------------------- */ | |
36411 | + | |
53392da6 AM |
36412 | +static inline int au_wkq_test(void) |
36413 | +{ | |
36414 | + return current->flags & PF_WQ_WORKER; | |
36415 | +} | |
36416 | + | |
b752ccd1 | 36417 | +static inline int au_wkq_wait(au_wkq_func_t func, void *args) |
1facf9fc | 36418 | +{ |
b752ccd1 | 36419 | + return au_wkq_do_wait(AuWkq_WAIT, func, args); |
1facf9fc | 36420 | +} |
36421 | + | |
36422 | +static inline void au_nwt_done(struct au_nowait_tasks *nwt) | |
36423 | +{ | |
f0c0a007 | 36424 | + if (atomic_dec_and_test(&nwt->nw_len)) |
1facf9fc | 36425 | + wake_up_all(&nwt->nw_wq); |
36426 | +} | |
36427 | + | |
36428 | +static inline int au_nwt_flush(struct au_nowait_tasks *nwt) | |
36429 | +{ | |
f0c0a007 | 36430 | + wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); |
1facf9fc | 36431 | + return 0; |
36432 | +} | |
36433 | + | |
36434 | +#endif /* __KERNEL__ */ | |
36435 | +#endif /* __AUFS_WKQ_H__ */ | |
c1595e42 | 36436 | diff -urN /usr/share/empty/fs/aufs/xattr.c linux/fs/aufs/xattr.c |
eca34b5c | 36437 | --- /usr/share/empty/fs/aufs/xattr.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 36438 | +++ linux/fs/aufs/xattr.c 2020-01-27 10:57:18.182205184 +0100 |
062440b3 | 36439 | @@ -0,0 +1,356 @@ |
cd7a4cd9 | 36440 | +// SPDX-License-Identifier: GPL-2.0 |
c1595e42 | 36441 | +/* |
016522bc | 36442 | + * Copyright (C) 2014-2020 Junjiro R. Okajima |
c1595e42 JR |
36443 | + * |
36444 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36445 | + * it under the terms of the GNU General Public License as published by | |
36446 | + * the Free Software Foundation; either version 2 of the License, or | |
36447 | + * (at your option) any later version. | |
36448 | + * | |
36449 | + * This program is distributed in the hope that it will be useful, | |
36450 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36451 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36452 | + * GNU General Public License for more details. | |
36453 | + * | |
36454 | + * You should have received a copy of the GNU General Public License | |
36455 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
36456 | + */ | |
36457 | + | |
36458 | +/* | |
36459 | + * handling xattr functions | |
36460 | + */ | |
36461 | + | |
a2654f78 AM |
36462 | +#include <linux/fs.h> |
36463 | +#include <linux/posix_acl_xattr.h> | |
c1595e42 JR |
36464 | +#include <linux/xattr.h> |
36465 | +#include "aufs.h" | |
36466 | + | |
36467 | +static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags) | |
36468 | +{ | |
36469 | + if (!ignore_flags) | |
36470 | + goto out; | |
36471 | + switch (err) { | |
36472 | + case -ENOMEM: | |
36473 | + case -EDQUOT: | |
36474 | + goto out; | |
36475 | + } | |
36476 | + | |
36477 | + if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) { | |
36478 | + err = 0; | |
36479 | + goto out; | |
36480 | + } | |
36481 | + | |
36482 | +#define cmp(brattr, prefix) do { \ | |
36483 | + if (!strncmp(name, XATTR_##prefix##_PREFIX, \ | |
36484 | + XATTR_##prefix##_PREFIX_LEN)) { \ | |
36485 | + if (ignore_flags & AuBrAttr_ICEX_##brattr) \ | |
36486 | + err = 0; \ | |
36487 | + goto out; \ | |
36488 | + } \ | |
36489 | + } while (0) | |
36490 | + | |
36491 | + cmp(SEC, SECURITY); | |
36492 | + cmp(SYS, SYSTEM); | |
36493 | + cmp(TR, TRUSTED); | |
36494 | + cmp(USR, USER); | |
36495 | +#undef cmp | |
36496 | + | |
36497 | + if (ignore_flags & AuBrAttr_ICEX_OTH) | |
36498 | + err = 0; | |
36499 | + | |
36500 | +out: | |
36501 | + return err; | |
36502 | +} | |
36503 | + | |
36504 | +static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1; | |
36505 | + | |
36506 | +static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, | |
7e9cd9fe AM |
36507 | + char *name, char **buf, unsigned int ignore_flags, |
36508 | + unsigned int verbose) | |
c1595e42 JR |
36509 | +{ |
36510 | + int err; | |
36511 | + ssize_t ssz; | |
36512 | + struct inode *h_idst; | |
36513 | + | |
36514 | + ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS); | |
36515 | + err = ssz; | |
36516 | + if (unlikely(err <= 0)) { | |
c1595e42 JR |
36517 | + if (err == -ENODATA |
36518 | + || (err == -EOPNOTSUPP | |
b912730e | 36519 | + && ((ignore_flags & au_xattr_out_of_list) |
5527c038 | 36520 | + || (au_test_nfs_noacl(d_inode(h_src)) |
b912730e AM |
36521 | + && (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) |
36522 | + || !strcmp(name, | |
36523 | + XATTR_NAME_POSIX_ACL_DEFAULT)))) | |
36524 | + )) | |
c1595e42 | 36525 | + err = 0; |
b912730e AM |
36526 | + if (err && (verbose || au_debug_test())) |
36527 | + pr_err("%s, err %d\n", name, err); | |
c1595e42 JR |
36528 | + goto out; |
36529 | + } | |
36530 | + | |
36531 | + /* unlock it temporary */ | |
5527c038 | 36532 | + h_idst = d_inode(h_dst); |
febd17d6 | 36533 | + inode_unlock(h_idst); |
c1595e42 | 36534 | + err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0); |
febd17d6 | 36535 | + inode_lock_nested(h_idst, AuLsc_I_CHILD2); |
c1595e42 | 36536 | + if (unlikely(err)) { |
7e9cd9fe AM |
36537 | + if (verbose || au_debug_test()) |
36538 | + pr_err("%s, err %d\n", name, err); | |
c1595e42 JR |
36539 | + err = au_xattr_ignore(err, name, ignore_flags); |
36540 | + } | |
36541 | + | |
36542 | +out: | |
36543 | + return err; | |
36544 | +} | |
36545 | + | |
7e9cd9fe AM |
36546 | +int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, |
36547 | + unsigned int verbose) | |
c1595e42 JR |
36548 | +{ |
36549 | + int err, unlocked, acl_access, acl_default; | |
36550 | + ssize_t ssz; | |
36551 | + struct inode *h_isrc, *h_idst; | |
36552 | + char *value, *p, *o, *e; | |
36553 | + | |
36554 | + /* try stopping to update the source inode while we are referencing */ | |
7e9cd9fe | 36555 | + /* there should not be the parent-child relationship between them */ |
5527c038 JR |
36556 | + h_isrc = d_inode(h_src); |
36557 | + h_idst = d_inode(h_dst); | |
febd17d6 | 36558 | + inode_unlock(h_idst); |
be118d29 | 36559 | + inode_lock_shared_nested(h_isrc, AuLsc_I_CHILD); |
febd17d6 | 36560 | + inode_lock_nested(h_idst, AuLsc_I_CHILD2); |
c1595e42 JR |
36561 | + unlocked = 0; |
36562 | + | |
36563 | + /* some filesystems don't list POSIX ACL, for example tmpfs */ | |
36564 | + ssz = vfs_listxattr(h_src, NULL, 0); | |
36565 | + err = ssz; | |
36566 | + if (unlikely(err < 0)) { | |
36567 | + AuTraceErr(err); | |
36568 | + if (err == -ENODATA | |
36569 | + || err == -EOPNOTSUPP) | |
36570 | + err = 0; /* ignore */ | |
36571 | + goto out; | |
36572 | + } | |
36573 | + | |
36574 | + err = 0; | |
36575 | + p = NULL; | |
36576 | + o = NULL; | |
36577 | + if (ssz) { | |
36578 | + err = -ENOMEM; | |
36579 | + p = kmalloc(ssz, GFP_NOFS); | |
36580 | + o = p; | |
36581 | + if (unlikely(!p)) | |
36582 | + goto out; | |
36583 | + err = vfs_listxattr(h_src, p, ssz); | |
36584 | + } | |
3c1bdaff | 36585 | + inode_unlock_shared(h_isrc); |
c1595e42 JR |
36586 | + unlocked = 1; |
36587 | + AuDbg("err %d, ssz %zd\n", err, ssz); | |
36588 | + if (unlikely(err < 0)) | |
36589 | + goto out_free; | |
36590 | + | |
36591 | + err = 0; | |
36592 | + e = p + ssz; | |
36593 | + value = NULL; | |
36594 | + acl_access = 0; | |
36595 | + acl_default = 0; | |
36596 | + while (!err && p < e) { | |
36597 | + acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS, | |
36598 | + sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1); | |
36599 | + acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT, | |
36600 | + sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) | |
36601 | + - 1); | |
7e9cd9fe AM |
36602 | + err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags, |
36603 | + verbose); | |
c1595e42 JR |
36604 | + p += strlen(p) + 1; |
36605 | + } | |
36606 | + AuTraceErr(err); | |
36607 | + ignore_flags |= au_xattr_out_of_list; | |
36608 | + if (!err && !acl_access) { | |
36609 | + err = au_do_cpup_xattr(h_dst, h_src, | |
36610 | + XATTR_NAME_POSIX_ACL_ACCESS, &value, | |
7e9cd9fe | 36611 | + ignore_flags, verbose); |
c1595e42 JR |
36612 | + AuTraceErr(err); |
36613 | + } | |
36614 | + if (!err && !acl_default) { | |
36615 | + err = au_do_cpup_xattr(h_dst, h_src, | |
36616 | + XATTR_NAME_POSIX_ACL_DEFAULT, &value, | |
7e9cd9fe | 36617 | + ignore_flags, verbose); |
c1595e42 JR |
36618 | + AuTraceErr(err); |
36619 | + } | |
36620 | + | |
9f237c51 | 36621 | + au_kfree_try_rcu(value); |
c1595e42 JR |
36622 | + |
36623 | +out_free: | |
9f237c51 | 36624 | + au_kfree_try_rcu(o); |
c1595e42 JR |
36625 | +out: |
36626 | + if (!unlocked) | |
3c1bdaff | 36627 | + inode_unlock_shared(h_isrc); |
c1595e42 JR |
36628 | + AuTraceErr(err); |
36629 | + return err; | |
36630 | +} | |
36631 | + | |
36632 | +/* ---------------------------------------------------------------------- */ | |
36633 | + | |
a2654f78 AM |
36634 | +static int au_smack_reentering(struct super_block *sb) |
36635 | +{ | |
36636 | +#if IS_ENABLED(CONFIG_SECURITY_SMACK) | |
36637 | + /* | |
36638 | + * as a part of lookup, smack_d_instantiate() is called, and it calls | |
36639 | + * i_op->getxattr(). ouch. | |
36640 | + */ | |
36641 | + return si_pid_test(sb); | |
36642 | +#else | |
36643 | + return 0; | |
36644 | +#endif | |
36645 | +} | |
36646 | + | |
c1595e42 JR |
36647 | +enum { |
36648 | + AU_XATTR_LIST, | |
36649 | + AU_XATTR_GET | |
36650 | +}; | |
36651 | + | |
36652 | +struct au_lgxattr { | |
36653 | + int type; | |
36654 | + union { | |
36655 | + struct { | |
36656 | + char *list; | |
36657 | + size_t size; | |
36658 | + } list; | |
36659 | + struct { | |
36660 | + const char *name; | |
36661 | + void *value; | |
36662 | + size_t size; | |
36663 | + } get; | |
36664 | + } u; | |
36665 | +}; | |
36666 | + | |
36667 | +static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg) | |
36668 | +{ | |
36669 | + ssize_t err; | |
a2654f78 | 36670 | + int reenter; |
c1595e42 JR |
36671 | + struct path h_path; |
36672 | + struct super_block *sb; | |
36673 | + | |
36674 | + sb = dentry->d_sb; | |
a2654f78 AM |
36675 | + reenter = au_smack_reentering(sb); |
36676 | + if (!reenter) { | |
36677 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
36678 | + if (unlikely(err)) | |
36679 | + goto out; | |
36680 | + } | |
36681 | + err = au_h_path_getattr(dentry, /*force*/1, &h_path, reenter); | |
c1595e42 JR |
36682 | + if (unlikely(err)) |
36683 | + goto out_si; | |
36684 | + if (unlikely(!h_path.dentry)) | |
36685 | + /* illegally overlapped or something */ | |
36686 | + goto out_di; /* pretending success */ | |
36687 | + | |
36688 | + /* always topmost entry only */ | |
36689 | + switch (arg->type) { | |
36690 | + case AU_XATTR_LIST: | |
36691 | + err = vfs_listxattr(h_path.dentry, | |
36692 | + arg->u.list.list, arg->u.list.size); | |
36693 | + break; | |
36694 | + case AU_XATTR_GET: | |
5afbbe0d | 36695 | + AuDebugOn(d_is_negative(h_path.dentry)); |
c1595e42 JR |
36696 | + err = vfs_getxattr(h_path.dentry, |
36697 | + arg->u.get.name, arg->u.get.value, | |
36698 | + arg->u.get.size); | |
36699 | + break; | |
36700 | + } | |
36701 | + | |
36702 | +out_di: | |
a2654f78 AM |
36703 | + if (!reenter) |
36704 | + di_read_unlock(dentry, AuLock_IR); | |
c1595e42 | 36705 | +out_si: |
a2654f78 AM |
36706 | + if (!reenter) |
36707 | + si_read_unlock(sb); | |
c1595e42 JR |
36708 | +out: |
36709 | + AuTraceErr(err); | |
36710 | + return err; | |
36711 | +} | |
36712 | + | |
36713 | +ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size) | |
36714 | +{ | |
36715 | + struct au_lgxattr arg = { | |
36716 | + .type = AU_XATTR_LIST, | |
36717 | + .u.list = { | |
36718 | + .list = list, | |
36719 | + .size = size | |
36720 | + }, | |
36721 | + }; | |
36722 | + | |
36723 | + return au_lgxattr(dentry, &arg); | |
36724 | +} | |
36725 | + | |
f2c43d5f AM |
36726 | +static ssize_t au_getxattr(struct dentry *dentry, |
36727 | + struct inode *inode __maybe_unused, | |
36728 | + const char *name, void *value, size_t size) | |
c1595e42 JR |
36729 | +{ |
36730 | + struct au_lgxattr arg = { | |
36731 | + .type = AU_XATTR_GET, | |
36732 | + .u.get = { | |
36733 | + .name = name, | |
36734 | + .value = value, | |
36735 | + .size = size | |
36736 | + }, | |
36737 | + }; | |
36738 | + | |
36739 | + return au_lgxattr(dentry, &arg); | |
36740 | +} | |
36741 | + | |
f2c43d5f AM |
36742 | +static int au_setxattr(struct dentry *dentry, struct inode *inode, |
36743 | + const char *name, const void *value, size_t size, | |
36744 | + int flags) | |
c1595e42 | 36745 | +{ |
f2c43d5f | 36746 | + struct au_sxattr arg = { |
c1595e42 JR |
36747 | + .type = AU_XATTR_SET, |
36748 | + .u.set = { | |
36749 | + .name = name, | |
36750 | + .value = value, | |
36751 | + .size = size, | |
36752 | + .flags = flags | |
36753 | + }, | |
36754 | + }; | |
36755 | + | |
f2c43d5f | 36756 | + return au_sxattr(dentry, inode, &arg); |
c1595e42 JR |
36757 | +} |
36758 | + | |
36759 | +/* ---------------------------------------------------------------------- */ | |
36760 | + | |
f2c43d5f AM |
36761 | +static int au_xattr_get(const struct xattr_handler *handler, |
36762 | + struct dentry *dentry, struct inode *inode, | |
36763 | + const char *name, void *buffer, size_t size) | |
c1595e42 | 36764 | +{ |
f2c43d5f | 36765 | + return au_getxattr(dentry, inode, name, buffer, size); |
c1595e42 JR |
36766 | +} |
36767 | + | |
f2c43d5f AM |
36768 | +static int au_xattr_set(const struct xattr_handler *handler, |
36769 | + struct dentry *dentry, struct inode *inode, | |
36770 | + const char *name, const void *value, size_t size, | |
36771 | + int flags) | |
c1595e42 | 36772 | +{ |
f2c43d5f | 36773 | + return au_setxattr(dentry, inode, name, value, size, flags); |
c1595e42 JR |
36774 | +} |
36775 | + | |
36776 | +static const struct xattr_handler au_xattr_handler = { | |
f2c43d5f AM |
36777 | + .name = "", |
36778 | + .prefix = "", | |
c1595e42 JR |
36779 | + .get = au_xattr_get, |
36780 | + .set = au_xattr_set | |
c1595e42 JR |
36781 | +}; |
36782 | + | |
36783 | +static const struct xattr_handler *au_xattr_handlers[] = { | |
a2654f78 AM |
36784 | +#ifdef CONFIG_FS_POSIX_ACL |
36785 | + &posix_acl_access_xattr_handler, | |
36786 | + &posix_acl_default_xattr_handler, | |
36787 | +#endif | |
36788 | + &au_xattr_handler, /* must be last */ | |
f2c43d5f | 36789 | + NULL |
c1595e42 JR |
36790 | +}; |
36791 | + | |
36792 | +void au_xattr_init(struct super_block *sb) | |
36793 | +{ | |
f2c43d5f | 36794 | + sb->s_xattr = au_xattr_handlers; |
c1595e42 | 36795 | +} |
7f207e10 | 36796 | diff -urN /usr/share/empty/fs/aufs/xino.c linux/fs/aufs/xino.c |
eca34b5c | 36797 | --- /usr/share/empty/fs/aufs/xino.c 1970-01-01 01:00:00.000000000 +0100 |
016522bc AM |
36798 | +++ linux/fs/aufs/xino.c 2020-04-03 08:16:49.834195677 +0200 |
36799 | @@ -0,0 +1,1966 @@ | |
cd7a4cd9 | 36800 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 36801 | +/* |
016522bc | 36802 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
1facf9fc | 36803 | + * |
36804 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36805 | + * it under the terms of the GNU General Public License as published by | |
36806 | + * the Free Software Foundation; either version 2 of the License, or | |
36807 | + * (at your option) any later version. | |
dece6358 AM |
36808 | + * |
36809 | + * This program is distributed in the hope that it will be useful, | |
36810 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36811 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36812 | + * GNU General Public License for more details. | |
36813 | + * | |
36814 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 36815 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 36816 | + */ |
36817 | + | |
36818 | +/* | |
36819 | + * external inode number translation table and bitmap | |
062440b3 AM |
36820 | + * |
36821 | + * things to consider | |
36822 | + * - the lifetime | |
36823 | + * + au_xino object | |
36824 | + * + XINO files (xino, xib, xigen) | |
36825 | + * + dynamic debugfs entries (xiN) | |
36826 | + * + static debugfs entries (xib, xigen) | |
36827 | + * + static sysfs entry (xi_path) | |
36828 | + * - several entry points to handle them. | |
36829 | + * + mount(2) without xino option (default) | |
36830 | + * + mount(2) with xino option | |
36831 | + * + mount(2) with noxino option | |
36832 | + * + umount(2) | |
36833 | + * + remount with add/del branches | |
36834 | + * + remount with xino/noxino options | |
1facf9fc | 36835 | + */ |
36836 | + | |
36837 | +#include <linux/seq_file.h> | |
392086de | 36838 | +#include <linux/statfs.h> |
1facf9fc | 36839 | +#include "aufs.h" |
36840 | + | |
062440b3 AM |
36841 | +static aufs_bindex_t sbr_find_shared(struct super_block *sb, aufs_bindex_t btop, |
36842 | + aufs_bindex_t bbot, | |
36843 | + struct super_block *h_sb) | |
1facf9fc | 36844 | +{ |
062440b3 AM |
36845 | + /* todo: try binary-search if the branches are many */ |
36846 | + for (; btop <= bbot; btop++) | |
36847 | + if (h_sb == au_sbr_sb(sb, btop)) | |
36848 | + return btop; | |
36849 | + return -1; | |
be52b249 AM |
36850 | +} |
36851 | + | |
062440b3 AM |
36852 | +/* |
36853 | + * find another branch who is on the same filesystem of the specified | |
36854 | + * branch{@btgt}. search until @bbot. | |
36855 | + */ | |
36856 | +static aufs_bindex_t is_sb_shared(struct super_block *sb, aufs_bindex_t btgt, | |
36857 | + aufs_bindex_t bbot) | |
1facf9fc | 36858 | +{ |
062440b3 AM |
36859 | + aufs_bindex_t bindex; |
36860 | + struct super_block *tgt_sb; | |
1facf9fc | 36861 | + |
062440b3 AM |
36862 | + tgt_sb = au_sbr_sb(sb, btgt); |
36863 | + bindex = sbr_find_shared(sb, /*btop*/0, btgt - 1, tgt_sb); | |
36864 | + if (bindex < 0) | |
36865 | + bindex = sbr_find_shared(sb, btgt + 1, bbot, tgt_sb); | |
1facf9fc | 36866 | + |
062440b3 | 36867 | + return bindex; |
1facf9fc | 36868 | +} |
36869 | + | |
36870 | +/* ---------------------------------------------------------------------- */ | |
36871 | + | |
36872 | +/* | |
062440b3 | 36873 | + * stop unnecessary notify events at creating xino files |
1facf9fc | 36874 | + */ |
acd2b654 AM |
36875 | + |
36876 | +aufs_bindex_t au_xi_root(struct super_block *sb, struct dentry *dentry) | |
36877 | +{ | |
36878 | + aufs_bindex_t bfound, bindex, bbot; | |
36879 | + struct dentry *parent; | |
36880 | + struct au_branch *br; | |
36881 | + | |
36882 | + bfound = -1; | |
36883 | + parent = dentry->d_parent; /* safe d_parent access */ | |
36884 | + bbot = au_sbbot(sb); | |
36885 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
36886 | + br = au_sbr(sb, bindex); | |
36887 | + if (au_br_dentry(br) == parent) { | |
36888 | + bfound = bindex; | |
36889 | + break; | |
36890 | + } | |
36891 | + } | |
36892 | + | |
36893 | + AuDbg("bfound b%d\n", bfound); | |
36894 | + return bfound; | |
36895 | +} | |
36896 | + | |
062440b3 AM |
36897 | +struct au_xino_lock_dir { |
36898 | + struct au_hinode *hdir; | |
36899 | + struct dentry *parent; | |
36900 | + struct inode *dir; | |
36901 | +}; | |
36902 | + | |
36903 | +static struct dentry *au_dget_parent_lock(struct dentry *dentry, | |
36904 | + unsigned int lsc) | |
1facf9fc | 36905 | +{ |
062440b3 AM |
36906 | + struct dentry *parent; |
36907 | + struct inode *dir; | |
1facf9fc | 36908 | + |
062440b3 | 36909 | + parent = dget_parent(dentry); |
5527c038 | 36910 | + dir = d_inode(parent); |
062440b3 AM |
36911 | + inode_lock_nested(dir, lsc); |
36912 | +#if 0 /* it should not happen */ | |
36913 | + spin_lock(&dentry->d_lock); | |
36914 | + if (unlikely(dentry->d_parent != parent)) { | |
36915 | + spin_unlock(&dentry->d_lock); | |
36916 | + inode_unlock(dir); | |
36917 | + dput(parent); | |
36918 | + parent = NULL; | |
1facf9fc | 36919 | + goto out; |
36920 | + } | |
062440b3 | 36921 | + spin_unlock(&dentry->d_lock); |
1facf9fc | 36922 | + |
4f0767ce | 36923 | +out: |
062440b3 AM |
36924 | +#endif |
36925 | + return parent; | |
1facf9fc | 36926 | +} |
36927 | + | |
062440b3 | 36928 | +static void au_xino_lock_dir(struct super_block *sb, struct path *xipath, |
1facf9fc | 36929 | + struct au_xino_lock_dir *ldir) |
36930 | +{ | |
acd2b654 | 36931 | + aufs_bindex_t bindex; |
1facf9fc | 36932 | + |
36933 | + ldir->hdir = NULL; | |
acd2b654 | 36934 | + bindex = au_xi_root(sb, xipath->dentry); |
1facf9fc | 36935 | + if (bindex >= 0) { |
062440b3 | 36936 | + /* rw branch root */ |
5527c038 | 36937 | + ldir->hdir = au_hi(d_inode(sb->s_root), bindex); |
5afbbe0d | 36938 | + au_hn_inode_lock_nested(ldir->hdir, AuLsc_I_PARENT); |
1facf9fc | 36939 | + } else { |
062440b3 AM |
36940 | + /* other */ |
36941 | + ldir->parent = au_dget_parent_lock(xipath->dentry, | |
36942 | + AuLsc_I_PARENT); | |
febd17d6 | 36943 | + ldir->dir = d_inode(ldir->parent); |
1facf9fc | 36944 | + } |
36945 | +} | |
36946 | + | |
36947 | +static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir) | |
36948 | +{ | |
36949 | + if (ldir->hdir) | |
5afbbe0d | 36950 | + au_hn_inode_unlock(ldir->hdir); |
1facf9fc | 36951 | + else { |
febd17d6 | 36952 | + inode_unlock(ldir->dir); |
1facf9fc | 36953 | + dput(ldir->parent); |
36954 | + } | |
36955 | +} | |
36956 | + | |
36957 | +/* ---------------------------------------------------------------------- */ | |
36958 | + | |
062440b3 AM |
36959 | +/* |
36960 | + * create and set a new xino file | |
36961 | + */ | |
83b672a5 AM |
36962 | +struct file *au_xino_create(struct super_block *sb, char *fpath, int silent, |
36963 | + int wbrtop) | |
062440b3 AM |
36964 | +{ |
36965 | + struct file *file; | |
36966 | + struct dentry *h_parent, *d; | |
36967 | + struct inode *h_dir, *inode; | |
36968 | + int err; | |
83b672a5 | 36969 | + static DEFINE_MUTEX(mtx); |
062440b3 AM |
36970 | + |
36971 | + /* | |
36972 | + * at mount-time, and the xino file is the default path, | |
36973 | + * hnotify is disabled so we have no notify events to ignore. | |
36974 | + * when a user specified the xino, we cannot get au_hdir to be ignored. | |
36975 | + */ | |
83b672a5 AM |
36976 | + if (!wbrtop) |
36977 | + mutex_lock(&mtx); | |
062440b3 AM |
36978 | + file = vfsub_filp_open(fpath, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE |
36979 | + /* | __FMODE_NONOTIFY */, | |
cd7a4cd9 | 36980 | + 0666); |
062440b3 | 36981 | + if (IS_ERR(file)) { |
83b672a5 AM |
36982 | + if (!wbrtop) |
36983 | + mutex_unlock(&mtx); | |
062440b3 AM |
36984 | + if (!silent) |
36985 | + pr_err("open %s(%ld)\n", fpath, PTR_ERR(file)); | |
36986 | + return file; | |
36987 | + } | |
36988 | + | |
36989 | + /* keep file count */ | |
36990 | + err = 0; | |
36991 | + d = file->f_path.dentry; | |
36992 | + h_parent = au_dget_parent_lock(d, AuLsc_I_PARENT); | |
83b672a5 AM |
36993 | + if (!wbrtop) |
36994 | + mutex_unlock(&mtx); | |
062440b3 AM |
36995 | + /* mnt_want_write() is unnecessary here */ |
36996 | + h_dir = d_inode(h_parent); | |
36997 | + inode = file_inode(file); | |
36998 | + /* no delegation since it is just created */ | |
36999 | + if (inode->i_nlink) | |
37000 | + err = vfsub_unlink(h_dir, &file->f_path, /*delegated*/NULL, | |
37001 | + /*force*/0); | |
37002 | + inode_unlock(h_dir); | |
37003 | + dput(h_parent); | |
37004 | + if (unlikely(err)) { | |
37005 | + if (!silent) | |
37006 | + pr_err("unlink %s(%d)\n", fpath, err); | |
37007 | + goto out; | |
37008 | + } | |
37009 | + | |
37010 | + err = -EINVAL; | |
37011 | + if (unlikely(sb == d->d_sb)) { | |
37012 | + if (!silent) | |
37013 | + pr_err("%s must be outside\n", fpath); | |
37014 | + goto out; | |
37015 | + } | |
37016 | + if (unlikely(au_test_fs_bad_xino(d->d_sb))) { | |
37017 | + if (!silent) | |
37018 | + pr_err("xino doesn't support %s(%s)\n", | |
37019 | + fpath, au_sbtype(d->d_sb)); | |
37020 | + goto out; | |
37021 | + } | |
37022 | + return file; /* success */ | |
37023 | + | |
37024 | +out: | |
37025 | + fput(file); | |
37026 | + file = ERR_PTR(err); | |
37027 | + return file; | |
37028 | +} | |
37029 | + | |
37030 | +/* | |
37031 | + * create a new xinofile at the same place/path as @base. | |
37032 | + */ | |
37033 | +struct file *au_xino_create2(struct super_block *sb, struct path *base, | |
37034 | + struct file *copy_src) | |
37035 | +{ | |
37036 | + struct file *file; | |
37037 | + struct dentry *dentry, *parent; | |
37038 | + struct inode *dir, *delegated; | |
37039 | + struct qstr *name; | |
37040 | + struct path path; | |
37041 | + int err, do_unlock; | |
37042 | + struct au_xino_lock_dir ldir; | |
37043 | + | |
37044 | + do_unlock = 1; | |
37045 | + au_xino_lock_dir(sb, base, &ldir); | |
37046 | + dentry = base->dentry; | |
37047 | + parent = dentry->d_parent; /* dir inode is locked */ | |
37048 | + dir = d_inode(parent); | |
37049 | + IMustLock(dir); | |
37050 | + | |
37051 | + name = &dentry->d_name; | |
37052 | + path.dentry = vfsub_lookup_one_len(name->name, parent, name->len); | |
37053 | + if (IS_ERR(path.dentry)) { | |
37054 | + file = (void *)path.dentry; | |
37055 | + pr_err("%pd lookup err %ld\n", dentry, PTR_ERR(path.dentry)); | |
37056 | + goto out; | |
37057 | + } | |
37058 | + | |
37059 | + /* no need to mnt_want_write() since we call dentry_open() later */ | |
cd7a4cd9 | 37060 | + err = vfs_create(dir, path.dentry, 0666, NULL); |
062440b3 AM |
37061 | + if (unlikely(err)) { |
37062 | + file = ERR_PTR(err); | |
37063 | + pr_err("%pd create err %d\n", dentry, err); | |
37064 | + goto out_dput; | |
37065 | + } | |
37066 | + | |
37067 | + path.mnt = base->mnt; | |
37068 | + file = vfsub_dentry_open(&path, | |
37069 | + O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE | |
37070 | + /* | __FMODE_NONOTIFY */); | |
37071 | + if (IS_ERR(file)) { | |
37072 | + pr_err("%pd open err %ld\n", dentry, PTR_ERR(file)); | |
37073 | + goto out_dput; | |
37074 | + } | |
37075 | + | |
37076 | + delegated = NULL; | |
37077 | + err = vfsub_unlink(dir, &file->f_path, &delegated, /*force*/0); | |
37078 | + au_xino_unlock_dir(&ldir); | |
37079 | + do_unlock = 0; | |
37080 | + if (unlikely(err == -EWOULDBLOCK)) { | |
37081 | + pr_warn("cannot retry for NFSv4 delegation" | |
37082 | + " for an internal unlink\n"); | |
37083 | + iput(delegated); | |
37084 | + } | |
37085 | + if (unlikely(err)) { | |
37086 | + pr_err("%pd unlink err %d\n", dentry, err); | |
37087 | + goto out_fput; | |
37088 | + } | |
37089 | + | |
37090 | + if (copy_src) { | |
37091 | + /* no one can touch copy_src xino */ | |
37092 | + err = au_copy_file(file, copy_src, vfsub_f_size_read(copy_src)); | |
37093 | + if (unlikely(err)) { | |
37094 | + pr_err("%pd copy err %d\n", dentry, err); | |
37095 | + goto out_fput; | |
37096 | + } | |
37097 | + } | |
37098 | + goto out_dput; /* success */ | |
1facf9fc | 37099 | + |
062440b3 AM |
37100 | +out_fput: |
37101 | + fput(file); | |
37102 | + file = ERR_PTR(err); | |
37103 | +out_dput: | |
37104 | + dput(path.dentry); | |
37105 | +out: | |
37106 | + if (do_unlock) | |
37107 | + au_xino_unlock_dir(&ldir); | |
37108 | + return file; | |
37109 | +} | |
37110 | + | |
acd2b654 AM |
37111 | +struct file *au_xino_file1(struct au_xino *xi) |
37112 | +{ | |
37113 | + struct file *file; | |
37114 | + unsigned int u, nfile; | |
37115 | + | |
37116 | + file = NULL; | |
37117 | + nfile = xi->xi_nfile; | |
37118 | + for (u = 0; u < nfile; u++) { | |
37119 | + file = xi->xi_file[u]; | |
37120 | + if (file) | |
37121 | + break; | |
37122 | + } | |
37123 | + | |
37124 | + return file; | |
37125 | +} | |
37126 | + | |
37127 | +static int au_xino_file_set(struct au_xino *xi, int idx, struct file *file) | |
37128 | +{ | |
37129 | + int err; | |
37130 | + struct file *f; | |
37131 | + void *p; | |
37132 | + | |
37133 | + if (file) | |
37134 | + get_file(file); | |
37135 | + | |
37136 | + err = 0; | |
37137 | + f = NULL; | |
37138 | + if (idx < xi->xi_nfile) { | |
37139 | + f = xi->xi_file[idx]; | |
37140 | + if (f) | |
37141 | + fput(f); | |
37142 | + } else { | |
37143 | + p = au_kzrealloc(xi->xi_file, | |
37144 | + sizeof(*xi->xi_file) * xi->xi_nfile, | |
37145 | + sizeof(*xi->xi_file) * (idx + 1), | |
37146 | + GFP_NOFS, /*may_shrink*/0); | |
37147 | + if (p) { | |
37148 | + MtxMustLock(&xi->xi_mtx); | |
37149 | + xi->xi_file = p; | |
37150 | + xi->xi_nfile = idx + 1; | |
37151 | + } else { | |
37152 | + err = -ENOMEM; | |
37153 | + if (file) | |
37154 | + fput(file); | |
37155 | + goto out; | |
37156 | + } | |
37157 | + } | |
37158 | + xi->xi_file[idx] = file; | |
37159 | + | |
37160 | +out: | |
37161 | + return err; | |
37162 | +} | |
37163 | + | |
37164 | +/* | |
37165 | + * if @xinew->xi is not set, then create new xigen file. | |
37166 | + */ | |
37167 | +struct file *au_xi_new(struct super_block *sb, struct au_xi_new *xinew) | |
37168 | +{ | |
37169 | + struct file *file; | |
37170 | + int err; | |
37171 | + | |
37172 | + SiMustAnyLock(sb); | |
37173 | + | |
37174 | + file = au_xino_create2(sb, xinew->base, xinew->copy_src); | |
37175 | + if (IS_ERR(file)) { | |
37176 | + err = PTR_ERR(file); | |
37177 | + pr_err("%s[%d], err %d\n", | |
37178 | + xinew->xi ? "xino" : "xigen", | |
37179 | + xinew->idx, err); | |
37180 | + goto out; | |
37181 | + } | |
37182 | + | |
37183 | + if (xinew->xi) | |
37184 | + err = au_xino_file_set(xinew->xi, xinew->idx, file); | |
37185 | + else { | |
37186 | + BUG(); | |
37187 | + /* todo: make xigen file an array */ | |
37188 | + /* err = au_xigen_file_set(sb, xinew->idx, file); */ | |
37189 | + } | |
37190 | + fput(file); | |
37191 | + if (unlikely(err)) | |
37192 | + file = ERR_PTR(err); | |
37193 | + | |
37194 | +out: | |
37195 | + return file; | |
37196 | +} | |
37197 | + | |
062440b3 AM |
37198 | +/* ---------------------------------------------------------------------- */ |
37199 | + | |
37200 | +/* | |
37201 | + * truncate xino files | |
37202 | + */ | |
acd2b654 AM |
37203 | +static int au_xino_do_trunc(struct super_block *sb, aufs_bindex_t bindex, |
37204 | + int idx, struct kstatfs *st) | |
1facf9fc | 37205 | +{ |
37206 | + int err; | |
392086de | 37207 | + blkcnt_t blocks; |
acd2b654 AM |
37208 | + struct file *file, *new_xino; |
37209 | + struct au_xi_new xinew = { | |
37210 | + .idx = idx | |
37211 | + }; | |
37212 | + | |
37213 | + err = 0; | |
37214 | + xinew.xi = au_sbr(sb, bindex)->br_xino; | |
37215 | + file = au_xino_file(xinew.xi, idx); | |
37216 | + if (!file) | |
37217 | + goto out; | |
37218 | + | |
37219 | + xinew.base = &file->f_path; | |
37220 | + err = vfs_statfs(xinew.base, st); | |
37221 | + if (unlikely(err)) { | |
37222 | + AuErr1("statfs err %d, ignored\n", err); | |
37223 | + err = 0; | |
37224 | + goto out; | |
37225 | + } | |
37226 | + | |
37227 | + blocks = file_inode(file)->i_blocks; | |
37228 | + pr_info("begin truncating xino(b%d-%d), ib%llu, %llu/%llu free blks\n", | |
37229 | + bindex, idx, (u64)blocks, st->f_bfree, st->f_blocks); | |
37230 | + | |
37231 | + xinew.copy_src = file; | |
37232 | + new_xino = au_xi_new(sb, &xinew); | |
37233 | + if (IS_ERR(new_xino)) { | |
37234 | + err = PTR_ERR(new_xino); | |
37235 | + pr_err("xino(b%d-%d), err %d, ignored\n", bindex, idx, err); | |
37236 | + goto out; | |
37237 | + } | |
37238 | + | |
37239 | + err = vfs_statfs(&new_xino->f_path, st); | |
37240 | + if (!err) | |
37241 | + pr_info("end truncating xino(b%d-%d), ib%llu, %llu/%llu free blks\n", | |
37242 | + bindex, idx, (u64)file_inode(new_xino)->i_blocks, | |
37243 | + st->f_bfree, st->f_blocks); | |
37244 | + else { | |
37245 | + AuErr1("statfs err %d, ignored\n", err); | |
37246 | + err = 0; | |
37247 | + } | |
37248 | + | |
37249 | +out: | |
37250 | + return err; | |
37251 | +} | |
37252 | + | |
37253 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex, int idx_begin) | |
37254 | +{ | |
37255 | + int err, i; | |
37256 | + unsigned long jiffy; | |
062440b3 | 37257 | + aufs_bindex_t bbot; |
392086de | 37258 | + struct kstatfs *st; |
1facf9fc | 37259 | + struct au_branch *br; |
acd2b654 | 37260 | + struct au_xino *xi; |
1facf9fc | 37261 | + |
392086de | 37262 | + err = -ENOMEM; |
be52b249 | 37263 | + st = kmalloc(sizeof(*st), GFP_NOFS); |
392086de AM |
37264 | + if (unlikely(!st)) |
37265 | + goto out; | |
37266 | + | |
1facf9fc | 37267 | + err = -EINVAL; |
5afbbe0d AM |
37268 | + bbot = au_sbbot(sb); |
37269 | + if (unlikely(bindex < 0 || bbot < bindex)) | |
392086de | 37270 | + goto out_st; |
392086de | 37271 | + |
1facf9fc | 37272 | + err = 0; |
acd2b654 AM |
37273 | + jiffy = jiffies; |
37274 | + br = au_sbr(sb, bindex); | |
37275 | + xi = br->br_xino; | |
37276 | + for (i = idx_begin; !err && i < xi->xi_nfile; i++) | |
37277 | + err = au_xino_do_trunc(sb, bindex, i, st); | |
37278 | + if (!err) | |
37279 | + au_sbi(sb)->si_xino_jiffy = jiffy; | |
392086de AM |
37280 | + |
37281 | +out_st: | |
9f237c51 | 37282 | + au_kfree_rcu(st); |
4f0767ce | 37283 | +out: |
1facf9fc | 37284 | + return err; |
37285 | +} | |
37286 | + | |
37287 | +struct xino_do_trunc_args { | |
37288 | + struct super_block *sb; | |
37289 | + struct au_branch *br; | |
acd2b654 | 37290 | + int idx; |
1facf9fc | 37291 | +}; |
37292 | + | |
37293 | +static void xino_do_trunc(void *_args) | |
37294 | +{ | |
37295 | + struct xino_do_trunc_args *args = _args; | |
37296 | + struct super_block *sb; | |
37297 | + struct au_branch *br; | |
37298 | + struct inode *dir; | |
acd2b654 | 37299 | + int err, idx; |
1facf9fc | 37300 | + aufs_bindex_t bindex; |
37301 | + | |
37302 | + err = 0; | |
37303 | + sb = args->sb; | |
5527c038 | 37304 | + dir = d_inode(sb->s_root); |
1facf9fc | 37305 | + br = args->br; |
acd2b654 | 37306 | + idx = args->idx; |
1facf9fc | 37307 | + |
37308 | + si_noflush_write_lock(sb); | |
37309 | + ii_read_lock_parent(dir); | |
37310 | + bindex = au_br_index(sb, br->br_id); | |
acd2b654 | 37311 | + err = au_xino_trunc(sb, bindex, idx); |
1facf9fc | 37312 | + ii_read_unlock(dir); |
37313 | + if (unlikely(err)) | |
392086de | 37314 | + pr_warn("err b%d, (%d)\n", bindex, err); |
062440b3 | 37315 | + atomic_dec(&br->br_xino->xi_truncating); |
acd2b654 | 37316 | + au_lcnt_dec(&br->br_count); |
1facf9fc | 37317 | + si_write_unlock(sb); |
027c5e7a | 37318 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
9f237c51 | 37319 | + au_kfree_rcu(args); |
1facf9fc | 37320 | +} |
37321 | + | |
acd2b654 AM |
37322 | +/* |
37323 | + * returns the index in the xi_file array whose corresponding file is necessary | |
37324 | + * to truncate, or -1 which means no need to truncate. | |
37325 | + */ | |
392086de AM |
37326 | +static int xino_trunc_test(struct super_block *sb, struct au_branch *br) |
37327 | +{ | |
37328 | + int err; | |
acd2b654 | 37329 | + unsigned int u; |
392086de AM |
37330 | + struct kstatfs st; |
37331 | + struct au_sbinfo *sbinfo; | |
acd2b654 | 37332 | + struct au_xino *xi; |
062440b3 | 37333 | + struct file *file; |
392086de AM |
37334 | + |
37335 | + /* todo: si_xino_expire and the ratio should be customizable */ | |
37336 | + sbinfo = au_sbi(sb); | |
37337 | + if (time_before(jiffies, | |
37338 | + sbinfo->si_xino_jiffy + sbinfo->si_xino_expire)) | |
acd2b654 | 37339 | + return -1; |
392086de AM |
37340 | + |
37341 | + /* truncation border */ | |
acd2b654 AM |
37342 | + xi = br->br_xino; |
37343 | + for (u = 0; u < xi->xi_nfile; u++) { | |
37344 | + file = au_xino_file(xi, u); | |
37345 | + if (!file) | |
37346 | + continue; | |
37347 | + | |
37348 | + err = vfs_statfs(&file->f_path, &st); | |
37349 | + if (unlikely(err)) { | |
37350 | + AuErr1("statfs err %d, ignored\n", err); | |
37351 | + return -1; | |
37352 | + } | |
37353 | + if (div64_u64(st.f_bfree * 100, st.f_blocks) | |
37354 | + >= AUFS_XINO_DEF_TRUNC) | |
37355 | + return u; | |
392086de | 37356 | + } |
392086de | 37357 | + |
acd2b654 | 37358 | + return -1; |
392086de AM |
37359 | +} |
37360 | + | |
1facf9fc | 37361 | +static void xino_try_trunc(struct super_block *sb, struct au_branch *br) |
37362 | +{ | |
acd2b654 | 37363 | + int idx; |
1facf9fc | 37364 | + struct xino_do_trunc_args *args; |
37365 | + int wkq_err; | |
37366 | + | |
acd2b654 AM |
37367 | + idx = xino_trunc_test(sb, br); |
37368 | + if (idx < 0) | |
1facf9fc | 37369 | + return; |
37370 | + | |
062440b3 | 37371 | + if (atomic_inc_return(&br->br_xino->xi_truncating) > 1) |
1facf9fc | 37372 | + goto out; |
37373 | + | |
37374 | + /* lock and kfree() will be called in trunc_xino() */ | |
37375 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
37376 | + if (unlikely(!args)) { | |
37377 | + AuErr1("no memory\n"); | |
f0c0a007 | 37378 | + goto out; |
1facf9fc | 37379 | + } |
37380 | + | |
acd2b654 | 37381 | + au_lcnt_inc(&br->br_count); |
1facf9fc | 37382 | + args->sb = sb; |
37383 | + args->br = br; | |
acd2b654 | 37384 | + args->idx = idx; |
53392da6 | 37385 | + wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0); |
1facf9fc | 37386 | + if (!wkq_err) |
37387 | + return; /* success */ | |
37388 | + | |
4a4d8108 | 37389 | + pr_err("wkq %d\n", wkq_err); |
acd2b654 | 37390 | + au_lcnt_dec(&br->br_count); |
9f237c51 | 37391 | + au_kfree_rcu(args); |
1facf9fc | 37392 | + |
4f0767ce | 37393 | +out: |
062440b3 | 37394 | + atomic_dec(&br->br_xino->xi_truncating); |
1facf9fc | 37395 | +} |
37396 | + | |
37397 | +/* ---------------------------------------------------------------------- */ | |
37398 | + | |
acd2b654 AM |
37399 | +struct au_xi_calc { |
37400 | + int idx; | |
37401 | + loff_t pos; | |
37402 | +}; | |
37403 | + | |
37404 | +static void au_xi_calc(struct super_block *sb, ino_t h_ino, | |
37405 | + struct au_xi_calc *calc) | |
37406 | +{ | |
37407 | + loff_t maxent; | |
37408 | + | |
37409 | + maxent = au_xi_maxent(sb); | |
37410 | + calc->idx = div64_u64_rem(h_ino, maxent, &calc->pos); | |
37411 | + calc->pos *= sizeof(ino_t); | |
37412 | +} | |
37413 | + | |
37414 | +static int au_xino_do_new_async(struct super_block *sb, struct au_branch *br, | |
37415 | + struct au_xi_calc *calc) | |
37416 | +{ | |
37417 | + int err; | |
37418 | + struct file *file; | |
37419 | + struct au_xino *xi = br->br_xino; | |
37420 | + struct au_xi_new xinew = { | |
37421 | + .xi = xi | |
37422 | + }; | |
37423 | + | |
37424 | + SiMustAnyLock(sb); | |
37425 | + | |
37426 | + err = 0; | |
37427 | + if (!xi) | |
37428 | + goto out; | |
37429 | + | |
37430 | + mutex_lock(&xi->xi_mtx); | |
37431 | + file = au_xino_file(xi, calc->idx); | |
37432 | + if (file) | |
37433 | + goto out_mtx; | |
37434 | + | |
37435 | + file = au_xino_file(xi, /*idx*/-1); | |
37436 | + AuDebugOn(!file); | |
37437 | + xinew.idx = calc->idx; | |
37438 | + xinew.base = &file->f_path; | |
37439 | + /* xinew.copy_src = NULL; */ | |
37440 | + file = au_xi_new(sb, &xinew); | |
37441 | + if (IS_ERR(file)) | |
37442 | + err = PTR_ERR(file); | |
37443 | + | |
37444 | +out_mtx: | |
37445 | + mutex_unlock(&xi->xi_mtx); | |
37446 | +out: | |
37447 | + return err; | |
37448 | +} | |
37449 | + | |
37450 | +struct au_xino_do_new_async_args { | |
37451 | + struct super_block *sb; | |
37452 | + struct au_branch *br; | |
37453 | + struct au_xi_calc calc; | |
37454 | + ino_t ino; | |
37455 | +}; | |
37456 | + | |
9f237c51 AM |
37457 | +struct au_xi_writing { |
37458 | + struct hlist_bl_node node; | |
37459 | + ino_t h_ino, ino; | |
37460 | +}; | |
37461 | + | |
acd2b654 AM |
37462 | +static int au_xino_do_write(vfs_writef_t write, struct file *file, |
37463 | + struct au_xi_calc *calc, ino_t ino); | |
37464 | + | |
37465 | +static void au_xino_call_do_new_async(void *args) | |
37466 | +{ | |
37467 | + struct au_xino_do_new_async_args *a = args; | |
37468 | + struct au_branch *br; | |
37469 | + struct super_block *sb; | |
37470 | + struct au_sbinfo *sbi; | |
37471 | + struct inode *root; | |
37472 | + struct file *file; | |
9f237c51 AM |
37473 | + struct au_xi_writing *del, *p; |
37474 | + struct hlist_bl_head *hbl; | |
37475 | + struct hlist_bl_node *pos; | |
acd2b654 AM |
37476 | + int err; |
37477 | + | |
37478 | + br = a->br; | |
37479 | + sb = a->sb; | |
37480 | + sbi = au_sbi(sb); | |
37481 | + si_noflush_read_lock(sb); | |
37482 | + root = d_inode(sb->s_root); | |
37483 | + ii_read_lock_child(root); | |
37484 | + err = au_xino_do_new_async(sb, br, &a->calc); | |
9f237c51 AM |
37485 | + if (unlikely(err)) { |
37486 | + AuIOErr("err %d\n", err); | |
37487 | + goto out; | |
37488 | + } | |
37489 | + | |
37490 | + file = au_xino_file(br->br_xino, a->calc.idx); | |
37491 | + AuDebugOn(!file); | |
37492 | + err = au_xino_do_write(sbi->si_xwrite, file, &a->calc, a->ino); | |
37493 | + if (unlikely(err)) { | |
acd2b654 | 37494 | + AuIOErr("err %d\n", err); |
9f237c51 AM |
37495 | + goto out; |
37496 | + } | |
37497 | + | |
37498 | + del = NULL; | |
37499 | + hbl = &br->br_xino->xi_writing; | |
37500 | + hlist_bl_lock(hbl); | |
37501 | + au_hbl_for_each(pos, hbl) { | |
37502 | + p = container_of(pos, struct au_xi_writing, node); | |
37503 | + if (p->ino == a->ino) { | |
37504 | + del = p; | |
37505 | + hlist_bl_del(&p->node); | |
37506 | + break; | |
37507 | + } | |
37508 | + } | |
37509 | + hlist_bl_unlock(hbl); | |
37510 | + au_kfree_rcu(del); | |
37511 | + | |
37512 | +out: | |
acd2b654 AM |
37513 | + au_lcnt_dec(&br->br_count); |
37514 | + ii_read_unlock(root); | |
37515 | + si_read_unlock(sb); | |
37516 | + au_nwt_done(&sbi->si_nowait); | |
9f237c51 | 37517 | + au_kfree_rcu(a); |
acd2b654 AM |
37518 | +} |
37519 | + | |
37520 | +/* | |
37521 | + * create a new xino file asynchronously | |
37522 | + */ | |
37523 | +static int au_xino_new_async(struct super_block *sb, struct au_branch *br, | |
37524 | + struct au_xi_calc *calc, ino_t ino) | |
37525 | +{ | |
37526 | + int err; | |
37527 | + struct au_xino_do_new_async_args *arg; | |
37528 | + | |
37529 | + err = -ENOMEM; | |
37530 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
37531 | + if (unlikely(!arg)) | |
37532 | + goto out; | |
37533 | + | |
37534 | + arg->sb = sb; | |
37535 | + arg->br = br; | |
37536 | + arg->calc = *calc; | |
37537 | + arg->ino = ino; | |
37538 | + au_lcnt_inc(&br->br_count); | |
37539 | + err = au_wkq_nowait(au_xino_call_do_new_async, arg, sb, AuWkq_NEST); | |
37540 | + if (unlikely(err)) { | |
37541 | + pr_err("wkq %d\n", err); | |
37542 | + au_lcnt_dec(&br->br_count); | |
9f237c51 | 37543 | + au_kfree_rcu(arg); |
acd2b654 AM |
37544 | + } |
37545 | + | |
37546 | +out: | |
37547 | + return err; | |
37548 | +} | |
37549 | + | |
062440b3 AM |
37550 | +/* |
37551 | + * read @ino from xinofile for the specified branch{@sb, @bindex} | |
37552 | + * at the position of @h_ino. | |
37553 | + */ | |
37554 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
37555 | + ino_t *ino) | |
37556 | +{ | |
37557 | + int err; | |
37558 | + ssize_t sz; | |
acd2b654 | 37559 | + struct au_xi_calc calc; |
062440b3 | 37560 | + struct au_sbinfo *sbinfo; |
acd2b654 | 37561 | + struct file *file; |
9f237c51 AM |
37562 | + struct au_xino *xi; |
37563 | + struct hlist_bl_head *hbl; | |
37564 | + struct hlist_bl_node *pos; | |
37565 | + struct au_xi_writing *p; | |
062440b3 AM |
37566 | + |
37567 | + *ino = 0; | |
37568 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
37569 | + return 0; /* no xino */ | |
37570 | + | |
37571 | + err = 0; | |
acd2b654 | 37572 | + au_xi_calc(sb, h_ino, &calc); |
9f237c51 AM |
37573 | + xi = au_sbr(sb, bindex)->br_xino; |
37574 | + file = au_xino_file(xi, calc.idx); | |
37575 | + if (!file) { | |
37576 | + hbl = &xi->xi_writing; | |
37577 | + hlist_bl_lock(hbl); | |
37578 | + au_hbl_for_each(pos, hbl) { | |
37579 | + p = container_of(pos, struct au_xi_writing, node); | |
37580 | + if (p->h_ino == h_ino) { | |
37581 | + AuDbg("hi%llu, i%llu, found\n", | |
37582 | + (u64)p->h_ino, (u64)p->ino); | |
37583 | + *ino = p->ino; | |
37584 | + break; | |
37585 | + } | |
37586 | + } | |
37587 | + hlist_bl_unlock(hbl); | |
37588 | + return 0; | |
37589 | + } else if (vfsub_f_size_read(file) < calc.pos + sizeof(*ino)) | |
37590 | + return 0; /* no xino */ | |
062440b3 | 37591 | + |
acd2b654 AM |
37592 | + sbinfo = au_sbi(sb); |
37593 | + sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &calc.pos); | |
062440b3 AM |
37594 | + if (sz == sizeof(*ino)) |
37595 | + return 0; /* success */ | |
37596 | + | |
37597 | + err = sz; | |
37598 | + if (unlikely(sz >= 0)) { | |
37599 | + err = -EIO; | |
37600 | + AuIOErr("xino read error (%zd)\n", sz); | |
37601 | + } | |
062440b3 AM |
37602 | + return err; |
37603 | +} | |
37604 | + | |
5527c038 | 37605 | +static int au_xino_do_write(vfs_writef_t write, struct file *file, |
acd2b654 | 37606 | + struct au_xi_calc *calc, ino_t ino) |
1facf9fc | 37607 | +{ |
1facf9fc | 37608 | + ssize_t sz; |
37609 | + | |
acd2b654 | 37610 | + sz = xino_fwrite(write, file, &ino, sizeof(ino), &calc->pos); |
1facf9fc | 37611 | + if (sz == sizeof(ino)) |
37612 | + return 0; /* success */ | |
37613 | + | |
37614 | + AuIOErr("write failed (%zd)\n", sz); | |
37615 | + return -EIO; | |
37616 | +} | |
37617 | + | |
37618 | +/* | |
37619 | + * write @ino to the xinofile for the specified branch{@sb, @bindex} | |
37620 | + * at the position of @h_ino. | |
37621 | + * even if @ino is zero, it is written to the xinofile and means no entry. | |
37622 | + * if the size of the xino file on a specific filesystem exceeds the watermark, | |
37623 | + * try truncating it. | |
37624 | + */ | |
37625 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
37626 | + ino_t ino) | |
37627 | +{ | |
37628 | + int err; | |
37629 | + unsigned int mnt_flags; | |
acd2b654 AM |
37630 | + struct au_xi_calc calc; |
37631 | + struct file *file; | |
1facf9fc | 37632 | + struct au_branch *br; |
acd2b654 | 37633 | + struct au_xino *xi; |
9f237c51 | 37634 | + struct au_xi_writing *p; |
1facf9fc | 37635 | + |
dece6358 | 37636 | + SiMustAnyLock(sb); |
1facf9fc | 37637 | + |
37638 | + mnt_flags = au_mntflags(sb); | |
37639 | + if (!au_opt_test(mnt_flags, XINO)) | |
37640 | + return 0; | |
37641 | + | |
acd2b654 | 37642 | + au_xi_calc(sb, h_ino, &calc); |
1facf9fc | 37643 | + br = au_sbr(sb, bindex); |
acd2b654 AM |
37644 | + xi = br->br_xino; |
37645 | + file = au_xino_file(xi, calc.idx); | |
37646 | + if (!file) { | |
9f237c51 AM |
37647 | + /* store the inum pair into the list */ |
37648 | + p = kmalloc(sizeof(*p), GFP_NOFS | __GFP_NOFAIL); | |
37649 | + p->h_ino = h_ino; | |
37650 | + p->ino = ino; | |
37651 | + au_hbl_add(&p->node, &xi->xi_writing); | |
37652 | + | |
acd2b654 AM |
37653 | + /* create and write a new xino file asynchronously */ |
37654 | + err = au_xino_new_async(sb, br, &calc, ino); | |
37655 | + if (!err) | |
37656 | + return 0; /* success */ | |
37657 | + goto out; | |
37658 | + } | |
37659 | + | |
37660 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, file, &calc, ino); | |
1facf9fc | 37661 | + if (!err) { |
acd2b654 | 37662 | + br = au_sbr(sb, bindex); |
1facf9fc | 37663 | + if (au_opt_test(mnt_flags, TRUNC_XINO) |
86dc4139 | 37664 | + && au_test_fs_trunc_xino(au_br_sb(br))) |
1facf9fc | 37665 | + xino_try_trunc(sb, br); |
37666 | + return 0; /* success */ | |
37667 | + } | |
37668 | + | |
acd2b654 | 37669 | +out: |
1facf9fc | 37670 | + AuIOErr("write failed (%d)\n", err); |
37671 | + return -EIO; | |
37672 | +} | |
37673 | + | |
062440b3 AM |
37674 | +static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, |
37675 | + size_t size, loff_t *pos); | |
1facf9fc | 37676 | + |
062440b3 AM |
37677 | +/* todo: unnecessary to support mmap_sem since kernel-space? */ |
37678 | +ssize_t xino_fread(vfs_readf_t func, struct file *file, void *kbuf, size_t size, | |
37679 | + loff_t *pos) | |
37680 | +{ | |
37681 | + ssize_t err; | |
37682 | + mm_segment_t oldfs; | |
37683 | + union { | |
37684 | + void *k; | |
37685 | + char __user *u; | |
37686 | + } buf; | |
37687 | + int i; | |
37688 | + const int prevent_endless = 10; | |
1facf9fc | 37689 | + |
062440b3 AM |
37690 | + i = 0; |
37691 | + buf.k = kbuf; | |
37692 | + oldfs = get_fs(); | |
37693 | + set_fs(KERNEL_DS); | |
37694 | + do { | |
37695 | + err = func(file, buf.u, size, pos); | |
37696 | + if (err == -EINTR | |
37697 | + && !au_wkq_test() | |
37698 | + && fatal_signal_pending(current)) { | |
37699 | + set_fs(oldfs); | |
37700 | + err = xino_fread_wkq(func, file, kbuf, size, pos); | |
37701 | + BUG_ON(err == -EINTR); | |
37702 | + oldfs = get_fs(); | |
37703 | + set_fs(KERNEL_DS); | |
37704 | + } | |
37705 | + } while (i++ < prevent_endless | |
37706 | + && (err == -EAGAIN || err == -EINTR)); | |
37707 | + set_fs(oldfs); | |
37708 | + | |
37709 | +#if 0 /* reserved for future use */ | |
37710 | + if (err > 0) | |
37711 | + fsnotify_access(file->f_path.dentry); | |
37712 | +#endif | |
37713 | + | |
37714 | + return err; | |
37715 | +} | |
37716 | + | |
37717 | +struct xino_fread_args { | |
37718 | + ssize_t *errp; | |
37719 | + vfs_readf_t func; | |
37720 | + struct file *file; | |
37721 | + void *buf; | |
37722 | + size_t size; | |
37723 | + loff_t *pos; | |
37724 | +}; | |
37725 | + | |
37726 | +static void call_xino_fread(void *args) | |
37727 | +{ | |
37728 | + struct xino_fread_args *a = args; | |
37729 | + *a->errp = xino_fread(a->func, a->file, a->buf, a->size, a->pos); | |
37730 | +} | |
37731 | + | |
37732 | +static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, | |
37733 | + size_t size, loff_t *pos) | |
37734 | +{ | |
37735 | + ssize_t err; | |
37736 | + int wkq_err; | |
37737 | + struct xino_fread_args args = { | |
37738 | + .errp = &err, | |
37739 | + .func = func, | |
37740 | + .file = file, | |
37741 | + .buf = buf, | |
37742 | + .size = size, | |
37743 | + .pos = pos | |
37744 | + }; | |
37745 | + | |
37746 | + wkq_err = au_wkq_wait(call_xino_fread, &args); | |
37747 | + if (unlikely(wkq_err)) | |
37748 | + err = wkq_err; | |
37749 | + | |
37750 | + return err; | |
37751 | +} | |
37752 | + | |
37753 | +static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, | |
37754 | + size_t size, loff_t *pos); | |
37755 | + | |
37756 | +static ssize_t do_xino_fwrite(vfs_writef_t func, struct file *file, void *kbuf, | |
37757 | + size_t size, loff_t *pos) | |
37758 | +{ | |
37759 | + ssize_t err; | |
37760 | + mm_segment_t oldfs; | |
37761 | + union { | |
37762 | + void *k; | |
37763 | + const char __user *u; | |
37764 | + } buf; | |
37765 | + int i; | |
37766 | + const int prevent_endless = 10; | |
37767 | + | |
37768 | + i = 0; | |
37769 | + buf.k = kbuf; | |
37770 | + oldfs = get_fs(); | |
37771 | + set_fs(KERNEL_DS); | |
37772 | + do { | |
37773 | + err = func(file, buf.u, size, pos); | |
37774 | + if (err == -EINTR | |
37775 | + && !au_wkq_test() | |
37776 | + && fatal_signal_pending(current)) { | |
37777 | + set_fs(oldfs); | |
37778 | + err = xino_fwrite_wkq(func, file, kbuf, size, pos); | |
37779 | + BUG_ON(err == -EINTR); | |
37780 | + oldfs = get_fs(); | |
37781 | + set_fs(KERNEL_DS); | |
37782 | + } | |
37783 | + } while (i++ < prevent_endless | |
37784 | + && (err == -EAGAIN || err == -EINTR)); | |
37785 | + set_fs(oldfs); | |
37786 | + | |
37787 | +#if 0 /* reserved for future use */ | |
37788 | + if (err > 0) | |
37789 | + fsnotify_modify(file->f_path.dentry); | |
37790 | +#endif | |
37791 | + | |
37792 | + return err; | |
37793 | +} | |
37794 | + | |
37795 | +struct do_xino_fwrite_args { | |
37796 | + ssize_t *errp; | |
37797 | + vfs_writef_t func; | |
37798 | + struct file *file; | |
37799 | + void *buf; | |
37800 | + size_t size; | |
37801 | + loff_t *pos; | |
37802 | +}; | |
37803 | + | |
37804 | +static void call_do_xino_fwrite(void *args) | |
37805 | +{ | |
37806 | + struct do_xino_fwrite_args *a = args; | |
37807 | + *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos); | |
37808 | +} | |
37809 | + | |
37810 | +static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, | |
37811 | + size_t size, loff_t *pos) | |
37812 | +{ | |
37813 | + ssize_t err; | |
37814 | + int wkq_err; | |
37815 | + struct do_xino_fwrite_args args = { | |
37816 | + .errp = &err, | |
37817 | + .func = func, | |
37818 | + .file = file, | |
37819 | + .buf = buf, | |
37820 | + .size = size, | |
37821 | + .pos = pos | |
37822 | + }; | |
37823 | + | |
37824 | + /* | |
37825 | + * it breaks RLIMIT_FSIZE and normal user's limit, | |
37826 | + * users should care about quota and real 'filesystem full.' | |
37827 | + */ | |
37828 | + wkq_err = au_wkq_wait(call_do_xino_fwrite, &args); | |
37829 | + if (unlikely(wkq_err)) | |
37830 | + err = wkq_err; | |
37831 | + | |
37832 | + return err; | |
37833 | +} | |
37834 | + | |
37835 | +ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, | |
37836 | + size_t size, loff_t *pos) | |
37837 | +{ | |
37838 | + ssize_t err; | |
37839 | + | |
37840 | + if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) { | |
37841 | + lockdep_off(); | |
37842 | + err = do_xino_fwrite(func, file, buf, size, pos); | |
37843 | + lockdep_on(); | |
37844 | + } else { | |
37845 | + lockdep_off(); | |
37846 | + err = xino_fwrite_wkq(func, file, buf, size, pos); | |
37847 | + lockdep_on(); | |
37848 | + } | |
37849 | + | |
37850 | + return err; | |
37851 | +} | |
37852 | + | |
37853 | +/* ---------------------------------------------------------------------- */ | |
37854 | + | |
37855 | +/* | |
37856 | + * inode number bitmap | |
37857 | + */ | |
1facf9fc | 37858 | +static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE; |
37859 | +static ino_t xib_calc_ino(unsigned long pindex, int bit) | |
37860 | +{ | |
37861 | + ino_t ino; | |
37862 | + | |
37863 | + AuDebugOn(bit < 0 || page_bits <= bit); | |
37864 | + ino = AUFS_FIRST_INO + pindex * page_bits + bit; | |
37865 | + return ino; | |
37866 | +} | |
37867 | + | |
37868 | +static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit) | |
37869 | +{ | |
37870 | + AuDebugOn(ino < AUFS_FIRST_INO); | |
37871 | + ino -= AUFS_FIRST_INO; | |
37872 | + *pindex = ino / page_bits; | |
37873 | + *bit = ino % page_bits; | |
37874 | +} | |
37875 | + | |
37876 | +static int xib_pindex(struct super_block *sb, unsigned long pindex) | |
37877 | +{ | |
37878 | + int err; | |
37879 | + loff_t pos; | |
37880 | + ssize_t sz; | |
37881 | + struct au_sbinfo *sbinfo; | |
37882 | + struct file *xib; | |
37883 | + unsigned long *p; | |
37884 | + | |
37885 | + sbinfo = au_sbi(sb); | |
37886 | + MtxMustLock(&sbinfo->si_xib_mtx); | |
37887 | + AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE | |
37888 | + || !au_opt_test(sbinfo->si_mntflags, XINO)); | |
37889 | + | |
37890 | + if (pindex == sbinfo->si_xib_last_pindex) | |
37891 | + return 0; | |
37892 | + | |
37893 | + xib = sbinfo->si_xib; | |
37894 | + p = sbinfo->si_xib_buf; | |
37895 | + pos = sbinfo->si_xib_last_pindex; | |
37896 | + pos *= PAGE_SIZE; | |
37897 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
37898 | + if (unlikely(sz != PAGE_SIZE)) | |
37899 | + goto out; | |
37900 | + | |
37901 | + pos = pindex; | |
37902 | + pos *= PAGE_SIZE; | |
c06a8ce3 | 37903 | + if (vfsub_f_size_read(xib) >= pos + PAGE_SIZE) |
1facf9fc | 37904 | + sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos); |
37905 | + else { | |
37906 | + memset(p, 0, PAGE_SIZE); | |
37907 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
37908 | + } | |
37909 | + if (sz == PAGE_SIZE) { | |
37910 | + sbinfo->si_xib_last_pindex = pindex; | |
37911 | + return 0; /* success */ | |
37912 | + } | |
37913 | + | |
4f0767ce | 37914 | +out: |
b752ccd1 AM |
37915 | + AuIOErr1("write failed (%zd)\n", sz); |
37916 | + err = sz; | |
37917 | + if (sz >= 0) | |
37918 | + err = -EIO; | |
37919 | + return err; | |
37920 | +} | |
37921 | + | |
b752ccd1 AM |
37922 | +static void au_xib_clear_bit(struct inode *inode) |
37923 | +{ | |
37924 | + int err, bit; | |
37925 | + unsigned long pindex; | |
37926 | + struct super_block *sb; | |
37927 | + struct au_sbinfo *sbinfo; | |
37928 | + | |
37929 | + AuDebugOn(inode->i_nlink); | |
37930 | + | |
37931 | + sb = inode->i_sb; | |
37932 | + xib_calc_bit(inode->i_ino, &pindex, &bit); | |
37933 | + AuDebugOn(page_bits <= bit); | |
37934 | + sbinfo = au_sbi(sb); | |
37935 | + mutex_lock(&sbinfo->si_xib_mtx); | |
37936 | + err = xib_pindex(sb, pindex); | |
37937 | + if (!err) { | |
37938 | + clear_bit(bit, sbinfo->si_xib_buf); | |
37939 | + sbinfo->si_xib_next_bit = bit; | |
37940 | + } | |
37941 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
37942 | +} | |
37943 | + | |
1facf9fc | 37944 | +/* ---------------------------------------------------------------------- */ |
37945 | + | |
1facf9fc | 37946 | +/* |
062440b3 | 37947 | + * truncate a xino bitmap file |
1facf9fc | 37948 | + */ |
1facf9fc | 37949 | + |
37950 | +/* todo: slow */ | |
37951 | +static int do_xib_restore(struct super_block *sb, struct file *file, void *page) | |
37952 | +{ | |
37953 | + int err, bit; | |
37954 | + ssize_t sz; | |
37955 | + unsigned long pindex; | |
37956 | + loff_t pos, pend; | |
37957 | + struct au_sbinfo *sbinfo; | |
5527c038 | 37958 | + vfs_readf_t func; |
1facf9fc | 37959 | + ino_t *ino; |
37960 | + unsigned long *p; | |
37961 | + | |
37962 | + err = 0; | |
37963 | + sbinfo = au_sbi(sb); | |
dece6358 | 37964 | + MtxMustLock(&sbinfo->si_xib_mtx); |
1facf9fc | 37965 | + p = sbinfo->si_xib_buf; |
37966 | + func = sbinfo->si_xread; | |
c06a8ce3 | 37967 | + pend = vfsub_f_size_read(file); |
1facf9fc | 37968 | + pos = 0; |
37969 | + while (pos < pend) { | |
37970 | + sz = xino_fread(func, file, page, PAGE_SIZE, &pos); | |
37971 | + err = sz; | |
37972 | + if (unlikely(sz <= 0)) | |
37973 | + goto out; | |
37974 | + | |
37975 | + err = 0; | |
37976 | + for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) { | |
37977 | + if (unlikely(*ino < AUFS_FIRST_INO)) | |
37978 | + continue; | |
37979 | + | |
37980 | + xib_calc_bit(*ino, &pindex, &bit); | |
37981 | + AuDebugOn(page_bits <= bit); | |
37982 | + err = xib_pindex(sb, pindex); | |
37983 | + if (!err) | |
37984 | + set_bit(bit, p); | |
37985 | + else | |
37986 | + goto out; | |
37987 | + } | |
37988 | + } | |
37989 | + | |
4f0767ce | 37990 | +out: |
1facf9fc | 37991 | + return err; |
37992 | +} | |
37993 | + | |
37994 | +static int xib_restore(struct super_block *sb) | |
37995 | +{ | |
acd2b654 AM |
37996 | + int err, i; |
37997 | + unsigned int nfile; | |
5afbbe0d | 37998 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 37999 | + void *page; |
062440b3 | 38000 | + struct au_branch *br; |
acd2b654 AM |
38001 | + struct au_xino *xi; |
38002 | + struct file *file; | |
1facf9fc | 38003 | + |
38004 | + err = -ENOMEM; | |
38005 | + page = (void *)__get_free_page(GFP_NOFS); | |
38006 | + if (unlikely(!page)) | |
38007 | + goto out; | |
38008 | + | |
38009 | + err = 0; | |
5afbbe0d AM |
38010 | + bbot = au_sbbot(sb); |
38011 | + for (bindex = 0; !err && bindex <= bbot; bindex++) | |
062440b3 AM |
38012 | + if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0) { |
38013 | + br = au_sbr(sb, bindex); | |
acd2b654 AM |
38014 | + xi = br->br_xino; |
38015 | + nfile = xi->xi_nfile; | |
38016 | + for (i = 0; i < nfile; i++) { | |
38017 | + file = au_xino_file(xi, i); | |
38018 | + if (file) | |
38019 | + err = do_xib_restore(sb, file, page); | |
38020 | + } | |
062440b3 AM |
38021 | + } else |
38022 | + AuDbg("skip shared b%d\n", bindex); | |
1c60b727 | 38023 | + free_page((unsigned long)page); |
1facf9fc | 38024 | + |
4f0767ce | 38025 | +out: |
1facf9fc | 38026 | + return err; |
38027 | +} | |
38028 | + | |
38029 | +int au_xib_trunc(struct super_block *sb) | |
38030 | +{ | |
38031 | + int err; | |
38032 | + ssize_t sz; | |
38033 | + loff_t pos; | |
1facf9fc | 38034 | + struct au_sbinfo *sbinfo; |
38035 | + unsigned long *p; | |
38036 | + struct file *file; | |
38037 | + | |
dece6358 AM |
38038 | + SiMustWriteLock(sb); |
38039 | + | |
1facf9fc | 38040 | + err = 0; |
38041 | + sbinfo = au_sbi(sb); | |
38042 | + if (!au_opt_test(sbinfo->si_mntflags, XINO)) | |
38043 | + goto out; | |
38044 | + | |
38045 | + file = sbinfo->si_xib; | |
c06a8ce3 | 38046 | + if (vfsub_f_size_read(file) <= PAGE_SIZE) |
1facf9fc | 38047 | + goto out; |
38048 | + | |
062440b3 | 38049 | + file = au_xino_create2(sb, &sbinfo->si_xib->f_path, NULL); |
1facf9fc | 38050 | + err = PTR_ERR(file); |
38051 | + if (IS_ERR(file)) | |
38052 | + goto out; | |
38053 | + fput(sbinfo->si_xib); | |
38054 | + sbinfo->si_xib = file; | |
38055 | + | |
38056 | + p = sbinfo->si_xib_buf; | |
38057 | + memset(p, 0, PAGE_SIZE); | |
38058 | + pos = 0; | |
38059 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos); | |
38060 | + if (unlikely(sz != PAGE_SIZE)) { | |
38061 | + err = sz; | |
38062 | + AuIOErr("err %d\n", err); | |
38063 | + if (sz >= 0) | |
38064 | + err = -EIO; | |
38065 | + goto out; | |
38066 | + } | |
38067 | + | |
38068 | + mutex_lock(&sbinfo->si_xib_mtx); | |
38069 | + /* mnt_want_write() is unnecessary here */ | |
38070 | + err = xib_restore(sb); | |
38071 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
38072 | + | |
38073 | +out: | |
38074 | + return err; | |
38075 | +} | |
38076 | + | |
38077 | +/* ---------------------------------------------------------------------- */ | |
38078 | + | |
acd2b654 | 38079 | +struct au_xino *au_xino_alloc(unsigned int nfile) |
062440b3 AM |
38080 | +{ |
38081 | + struct au_xino *xi; | |
38082 | + | |
38083 | + xi = kzalloc(sizeof(*xi), GFP_NOFS); | |
38084 | + if (unlikely(!xi)) | |
38085 | + goto out; | |
acd2b654 AM |
38086 | + xi->xi_nfile = nfile; |
38087 | + xi->xi_file = kcalloc(nfile, sizeof(*xi->xi_file), GFP_NOFS); | |
38088 | + if (unlikely(!xi->xi_file)) | |
38089 | + goto out_free; | |
062440b3 AM |
38090 | + |
38091 | + xi->xi_nondir.total = 8; /* initial size */ | |
38092 | + xi->xi_nondir.array = kcalloc(xi->xi_nondir.total, sizeof(ino_t), | |
38093 | + GFP_NOFS); | |
38094 | + if (unlikely(!xi->xi_nondir.array)) | |
acd2b654 | 38095 | + goto out_file; |
062440b3 AM |
38096 | + |
38097 | + spin_lock_init(&xi->xi_nondir.spin); | |
38098 | + init_waitqueue_head(&xi->xi_nondir.wqh); | |
acd2b654 | 38099 | + mutex_init(&xi->xi_mtx); |
9f237c51 | 38100 | + INIT_HLIST_BL_HEAD(&xi->xi_writing); |
062440b3 AM |
38101 | + atomic_set(&xi->xi_truncating, 0); |
38102 | + kref_init(&xi->xi_kref); | |
38103 | + goto out; /* success */ | |
38104 | + | |
acd2b654 | 38105 | +out_file: |
9f237c51 | 38106 | + au_kfree_try_rcu(xi->xi_file); |
062440b3 | 38107 | +out_free: |
9f237c51 | 38108 | + au_kfree_rcu(xi); |
062440b3 AM |
38109 | + xi = NULL; |
38110 | +out: | |
38111 | + return xi; | |
38112 | +} | |
38113 | + | |
acd2b654 | 38114 | +static int au_xino_init(struct au_branch *br, int idx, struct file *file) |
062440b3 AM |
38115 | +{ |
38116 | + int err; | |
38117 | + struct au_xino *xi; | |
38118 | + | |
38119 | + err = 0; | |
acd2b654 | 38120 | + xi = au_xino_alloc(idx + 1); |
062440b3 AM |
38121 | + if (unlikely(!xi)) { |
38122 | + err = -ENOMEM; | |
38123 | + goto out; | |
38124 | + } | |
38125 | + | |
acd2b654 AM |
38126 | + if (file) |
38127 | + get_file(file); | |
38128 | + xi->xi_file[idx] = file; | |
062440b3 AM |
38129 | + AuDebugOn(br->br_xino); |
38130 | + br->br_xino = xi; | |
38131 | + | |
38132 | +out: | |
38133 | + return err; | |
38134 | +} | |
38135 | + | |
38136 | +static void au_xino_release(struct kref *kref) | |
38137 | +{ | |
38138 | + struct au_xino *xi; | |
38139 | + int i; | |
9f237c51 AM |
38140 | + unsigned long ul; |
38141 | + struct hlist_bl_head *hbl; | |
38142 | + struct hlist_bl_node *pos, *n; | |
38143 | + struct au_xi_writing *p; | |
062440b3 AM |
38144 | + |
38145 | + xi = container_of(kref, struct au_xino, xi_kref); | |
acd2b654 AM |
38146 | + for (i = 0; i < xi->xi_nfile; i++) |
38147 | + if (xi->xi_file[i]) | |
38148 | + fput(xi->xi_file[i]); | |
062440b3 AM |
38149 | + for (i = xi->xi_nondir.total - 1; i >= 0; i--) |
38150 | + AuDebugOn(xi->xi_nondir.array[i]); | |
acd2b654 | 38151 | + mutex_destroy(&xi->xi_mtx); |
9f237c51 AM |
38152 | + hbl = &xi->xi_writing; |
38153 | + ul = au_hbl_count(hbl); | |
38154 | + if (unlikely(ul)) { | |
38155 | + pr_warn("xi_writing %lu\n", ul); | |
38156 | + hlist_bl_lock(hbl); | |
43982f53 | 38157 | + hlist_bl_for_each_entry_safe(p, pos, n, hbl, node) { |
9f237c51 | 38158 | + hlist_bl_del(&p->node); |
016522bc AM |
38159 | + /* kmemleak reported au_kfree_rcu() doesn't free it */ |
38160 | + kfree(p); | |
9f237c51 AM |
38161 | + } |
38162 | + hlist_bl_unlock(hbl); | |
38163 | + } | |
38164 | + au_kfree_try_rcu(xi->xi_file); | |
38165 | + au_kfree_try_rcu(xi->xi_nondir.array); | |
38166 | + au_kfree_rcu(xi); | |
062440b3 AM |
38167 | +} |
38168 | + | |
38169 | +int au_xino_put(struct au_branch *br) | |
38170 | +{ | |
38171 | + int ret; | |
38172 | + struct au_xino *xi; | |
38173 | + | |
38174 | + ret = 0; | |
38175 | + xi = br->br_xino; | |
38176 | + if (xi) { | |
38177 | + br->br_xino = NULL; | |
38178 | + ret = kref_put(&xi->xi_kref, au_xino_release); | |
38179 | + } | |
38180 | + | |
38181 | + return ret; | |
38182 | +} | |
38183 | + | |
062440b3 AM |
38184 | +/* ---------------------------------------------------------------------- */ |
38185 | + | |
1facf9fc | 38186 | +/* |
38187 | + * xino mount option handlers | |
38188 | + */ | |
1facf9fc | 38189 | + |
38190 | +/* xino bitmap */ | |
38191 | +static void xino_clear_xib(struct super_block *sb) | |
38192 | +{ | |
38193 | + struct au_sbinfo *sbinfo; | |
38194 | + | |
dece6358 AM |
38195 | + SiMustWriteLock(sb); |
38196 | + | |
1facf9fc | 38197 | + sbinfo = au_sbi(sb); |
062440b3 | 38198 | + /* unnecessary to clear sbinfo->si_xread and ->si_xwrite */ |
1facf9fc | 38199 | + if (sbinfo->si_xib) |
38200 | + fput(sbinfo->si_xib); | |
38201 | + sbinfo->si_xib = NULL; | |
f0c0a007 | 38202 | + if (sbinfo->si_xib_buf) |
1c60b727 | 38203 | + free_page((unsigned long)sbinfo->si_xib_buf); |
1facf9fc | 38204 | + sbinfo->si_xib_buf = NULL; |
38205 | +} | |
38206 | + | |
062440b3 | 38207 | +static int au_xino_set_xib(struct super_block *sb, struct path *path) |
1facf9fc | 38208 | +{ |
38209 | + int err; | |
38210 | + loff_t pos; | |
38211 | + struct au_sbinfo *sbinfo; | |
38212 | + struct file *file; | |
acd2b654 | 38213 | + struct super_block *xi_sb; |
1facf9fc | 38214 | + |
dece6358 AM |
38215 | + SiMustWriteLock(sb); |
38216 | + | |
1facf9fc | 38217 | + sbinfo = au_sbi(sb); |
062440b3 | 38218 | + file = au_xino_create2(sb, path, sbinfo->si_xib); |
1facf9fc | 38219 | + err = PTR_ERR(file); |
38220 | + if (IS_ERR(file)) | |
38221 | + goto out; | |
38222 | + if (sbinfo->si_xib) | |
38223 | + fput(sbinfo->si_xib); | |
38224 | + sbinfo->si_xib = file; | |
5527c038 JR |
38225 | + sbinfo->si_xread = vfs_readf(file); |
38226 | + sbinfo->si_xwrite = vfs_writef(file); | |
acd2b654 AM |
38227 | + xi_sb = file_inode(file)->i_sb; |
38228 | + sbinfo->si_ximaxent = xi_sb->s_maxbytes; | |
38229 | + if (unlikely(sbinfo->si_ximaxent < PAGE_SIZE)) { | |
38230 | + err = -EIO; | |
38231 | + pr_err("s_maxbytes(%llu) on %s is too small\n", | |
38232 | + (u64)sbinfo->si_ximaxent, au_sbtype(xi_sb)); | |
38233 | + goto out_unset; | |
38234 | + } | |
38235 | + sbinfo->si_ximaxent /= sizeof(ino_t); | |
1facf9fc | 38236 | + |
38237 | + err = -ENOMEM; | |
38238 | + if (!sbinfo->si_xib_buf) | |
38239 | + sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS); | |
38240 | + if (unlikely(!sbinfo->si_xib_buf)) | |
38241 | + goto out_unset; | |
38242 | + | |
38243 | + sbinfo->si_xib_last_pindex = 0; | |
38244 | + sbinfo->si_xib_next_bit = 0; | |
c06a8ce3 | 38245 | + if (vfsub_f_size_read(file) < PAGE_SIZE) { |
1facf9fc | 38246 | + pos = 0; |
38247 | + err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf, | |
38248 | + PAGE_SIZE, &pos); | |
38249 | + if (unlikely(err != PAGE_SIZE)) | |
38250 | + goto out_free; | |
38251 | + } | |
38252 | + err = 0; | |
38253 | + goto out; /* success */ | |
38254 | + | |
4f0767ce | 38255 | +out_free: |
f0c0a007 | 38256 | + if (sbinfo->si_xib_buf) |
1c60b727 | 38257 | + free_page((unsigned long)sbinfo->si_xib_buf); |
b752ccd1 AM |
38258 | + sbinfo->si_xib_buf = NULL; |
38259 | + if (err >= 0) | |
38260 | + err = -EIO; | |
4f0767ce | 38261 | +out_unset: |
b752ccd1 AM |
38262 | + fput(sbinfo->si_xib); |
38263 | + sbinfo->si_xib = NULL; | |
4f0767ce | 38264 | +out: |
062440b3 | 38265 | + AuTraceErr(err); |
b752ccd1 | 38266 | + return err; |
1facf9fc | 38267 | +} |
38268 | + | |
b752ccd1 AM |
38269 | +/* xino for each branch */ |
38270 | +static void xino_clear_br(struct super_block *sb) | |
38271 | +{ | |
5afbbe0d | 38272 | + aufs_bindex_t bindex, bbot; |
b752ccd1 | 38273 | + struct au_branch *br; |
1facf9fc | 38274 | + |
5afbbe0d AM |
38275 | + bbot = au_sbbot(sb); |
38276 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
b752ccd1 | 38277 | + br = au_sbr(sb, bindex); |
062440b3 AM |
38278 | + AuDebugOn(!br); |
38279 | + au_xino_put(br); | |
38280 | + } | |
38281 | +} | |
38282 | + | |
38283 | +static void au_xino_set_br_shared(struct super_block *sb, struct au_branch *br, | |
38284 | + aufs_bindex_t bshared) | |
38285 | +{ | |
38286 | + struct au_branch *brshared; | |
b752ccd1 | 38287 | + |
062440b3 AM |
38288 | + brshared = au_sbr(sb, bshared); |
38289 | + AuDebugOn(!brshared->br_xino); | |
38290 | + AuDebugOn(!brshared->br_xino->xi_file); | |
38291 | + if (br->br_xino != brshared->br_xino) { | |
38292 | + au_xino_get(brshared); | |
38293 | + au_xino_put(br); | |
38294 | + br->br_xino = brshared->br_xino; | |
b752ccd1 AM |
38295 | + } |
38296 | +} | |
38297 | + | |
062440b3 AM |
38298 | +struct au_xino_do_set_br { |
38299 | + vfs_writef_t writef; | |
38300 | + struct au_branch *br; | |
38301 | + ino_t h_ino; | |
38302 | + aufs_bindex_t bshared; | |
38303 | +}; | |
38304 | + | |
38305 | +static int au_xino_do_set_br(struct super_block *sb, struct path *path, | |
38306 | + struct au_xino_do_set_br *args) | |
1facf9fc | 38307 | +{ |
38308 | + int err; | |
acd2b654 | 38309 | + struct au_xi_calc calc; |
062440b3 | 38310 | + struct file *file; |
acd2b654 AM |
38311 | + struct au_branch *br; |
38312 | + struct au_xi_new xinew = { | |
38313 | + .base = path | |
38314 | + }; | |
062440b3 | 38315 | + |
acd2b654 AM |
38316 | + br = args->br; |
38317 | + xinew.xi = br->br_xino; | |
38318 | + au_xi_calc(sb, args->h_ino, &calc); | |
38319 | + xinew.copy_src = au_xino_file(xinew.xi, calc.idx); | |
38320 | + if (args->bshared >= 0) | |
062440b3 | 38321 | + /* shared xino */ |
acd2b654 AM |
38322 | + au_xino_set_br_shared(sb, br, args->bshared); |
38323 | + else if (!xinew.xi) { | |
38324 | + /* new xino */ | |
38325 | + err = au_xino_init(br, calc.idx, xinew.copy_src); | |
38326 | + if (unlikely(err)) | |
38327 | + goto out; | |
062440b3 AM |
38328 | + } |
38329 | + | |
acd2b654 AM |
38330 | + /* force re-creating */ |
38331 | + xinew.xi = br->br_xino; | |
38332 | + xinew.idx = calc.idx; | |
38333 | + mutex_lock(&xinew.xi->xi_mtx); | |
38334 | + file = au_xi_new(sb, &xinew); | |
38335 | + mutex_unlock(&xinew.xi->xi_mtx); | |
062440b3 AM |
38336 | + err = PTR_ERR(file); |
38337 | + if (IS_ERR(file)) | |
38338 | + goto out; | |
acd2b654 AM |
38339 | + AuDebugOn(!file); |
38340 | + | |
38341 | + err = au_xino_do_write(args->writef, file, &calc, AUFS_ROOT_INO); | |
38342 | + if (unlikely(err)) | |
38343 | + au_xino_put(br); | |
062440b3 | 38344 | + |
062440b3 AM |
38345 | +out: |
38346 | + AuTraceErr(err); | |
38347 | + return err; | |
38348 | +} | |
38349 | + | |
38350 | +static int au_xino_set_br(struct super_block *sb, struct path *path) | |
38351 | +{ | |
38352 | + int err; | |
38353 | + aufs_bindex_t bindex, bbot; | |
38354 | + struct au_xino_do_set_br args; | |
b752ccd1 | 38355 | + struct inode *inode; |
1facf9fc | 38356 | + |
b752ccd1 AM |
38357 | + SiMustWriteLock(sb); |
38358 | + | |
5afbbe0d | 38359 | + bbot = au_sbbot(sb); |
5527c038 | 38360 | + inode = d_inode(sb->s_root); |
062440b3 AM |
38361 | + args.writef = au_sbi(sb)->si_xwrite; |
38362 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
38363 | + args.h_ino = au_h_iptr(inode, bindex)->i_ino; | |
38364 | + args.br = au_sbr(sb, bindex); | |
38365 | + args.bshared = is_sb_shared(sb, bindex, bindex - 1); | |
38366 | + err = au_xino_do_set_br(sb, path, &args); | |
b752ccd1 | 38367 | + if (unlikely(err)) |
062440b3 | 38368 | + break; |
b752ccd1 | 38369 | + } |
1facf9fc | 38370 | + |
062440b3 | 38371 | + AuTraceErr(err); |
1facf9fc | 38372 | + return err; |
38373 | +} | |
b752ccd1 AM |
38374 | + |
38375 | +void au_xino_clr(struct super_block *sb) | |
38376 | +{ | |
38377 | + struct au_sbinfo *sbinfo; | |
38378 | + | |
38379 | + au_xigen_clr(sb); | |
38380 | + xino_clear_xib(sb); | |
38381 | + xino_clear_br(sb); | |
062440b3 | 38382 | + dbgaufs_brs_del(sb, 0); |
b752ccd1 AM |
38383 | + sbinfo = au_sbi(sb); |
38384 | + /* lvalue, do not call au_mntflags() */ | |
38385 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
38386 | +} | |
38387 | + | |
062440b3 | 38388 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount) |
b752ccd1 AM |
38389 | +{ |
38390 | + int err, skip; | |
062440b3 | 38391 | + struct dentry *dentry, *parent, *cur_dentry, *cur_parent; |
b752ccd1 AM |
38392 | + struct qstr *dname, *cur_name; |
38393 | + struct file *cur_xino; | |
b752ccd1 | 38394 | + struct au_sbinfo *sbinfo; |
062440b3 | 38395 | + struct path *path, *cur_path; |
b752ccd1 AM |
38396 | + |
38397 | + SiMustWriteLock(sb); | |
38398 | + | |
38399 | + err = 0; | |
38400 | + sbinfo = au_sbi(sb); | |
062440b3 AM |
38401 | + path = &xiopt->file->f_path; |
38402 | + dentry = path->dentry; | |
38403 | + parent = dget_parent(dentry); | |
b752ccd1 AM |
38404 | + if (remount) { |
38405 | + skip = 0; | |
b752ccd1 AM |
38406 | + cur_xino = sbinfo->si_xib; |
38407 | + if (cur_xino) { | |
062440b3 AM |
38408 | + cur_path = &cur_xino->f_path; |
38409 | + cur_dentry = cur_path->dentry; | |
38410 | + cur_parent = dget_parent(cur_dentry); | |
38411 | + cur_name = &cur_dentry->d_name; | |
38412 | + dname = &dentry->d_name; | |
b752ccd1 | 38413 | + skip = (cur_parent == parent |
38d290e6 | 38414 | + && au_qstreq(dname, cur_name)); |
b752ccd1 AM |
38415 | + dput(cur_parent); |
38416 | + } | |
38417 | + if (skip) | |
38418 | + goto out; | |
38419 | + } | |
38420 | + | |
38421 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
062440b3 AM |
38422 | + err = au_xino_set_xib(sb, path); |
38423 | + /* si_x{read,write} are set */ | |
b752ccd1 | 38424 | + if (!err) |
062440b3 | 38425 | + err = au_xigen_set(sb, path); |
b752ccd1 | 38426 | + if (!err) |
062440b3 AM |
38427 | + err = au_xino_set_br(sb, path); |
38428 | + if (!err) { | |
38429 | + dbgaufs_brs_add(sb, 0, /*topdown*/1); | |
b752ccd1 | 38430 | + goto out; /* success */ |
062440b3 | 38431 | + } |
b752ccd1 AM |
38432 | + |
38433 | + /* reset all */ | |
062440b3 AM |
38434 | + AuIOErr("failed setting xino(%d).\n", err); |
38435 | + au_xino_clr(sb); | |
b752ccd1 | 38436 | + |
4f0767ce | 38437 | +out: |
b752ccd1 AM |
38438 | + dput(parent); |
38439 | + return err; | |
38440 | +} | |
38441 | + | |
b752ccd1 AM |
38442 | +/* |
38443 | + * create a xinofile at the default place/path. | |
38444 | + */ | |
38445 | +struct file *au_xino_def(struct super_block *sb) | |
38446 | +{ | |
38447 | + struct file *file; | |
38448 | + char *page, *p; | |
38449 | + struct au_branch *br; | |
38450 | + struct super_block *h_sb; | |
38451 | + struct path path; | |
5afbbe0d | 38452 | + aufs_bindex_t bbot, bindex, bwr; |
b752ccd1 AM |
38453 | + |
38454 | + br = NULL; | |
5afbbe0d | 38455 | + bbot = au_sbbot(sb); |
b752ccd1 | 38456 | + bwr = -1; |
5afbbe0d | 38457 | + for (bindex = 0; bindex <= bbot; bindex++) { |
b752ccd1 AM |
38458 | + br = au_sbr(sb, bindex); |
38459 | + if (au_br_writable(br->br_perm) | |
86dc4139 | 38460 | + && !au_test_fs_bad_xino(au_br_sb(br))) { |
b752ccd1 AM |
38461 | + bwr = bindex; |
38462 | + break; | |
38463 | + } | |
38464 | + } | |
38465 | + | |
7f207e10 AM |
38466 | + if (bwr >= 0) { |
38467 | + file = ERR_PTR(-ENOMEM); | |
537831f9 | 38468 | + page = (void *)__get_free_page(GFP_NOFS); |
7f207e10 AM |
38469 | + if (unlikely(!page)) |
38470 | + goto out; | |
86dc4139 | 38471 | + path.mnt = au_br_mnt(br); |
7f207e10 AM |
38472 | + path.dentry = au_h_dptr(sb->s_root, bwr); |
38473 | + p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME)); | |
38474 | + file = (void *)p; | |
38475 | + if (!IS_ERR(p)) { | |
38476 | + strcat(p, "/" AUFS_XINO_FNAME); | |
38477 | + AuDbg("%s\n", p); | |
83b672a5 | 38478 | + file = au_xino_create(sb, p, /*silent*/0, /*wbrtop*/1); |
7f207e10 | 38479 | + } |
1c60b727 | 38480 | + free_page((unsigned long)page); |
7f207e10 | 38481 | + } else { |
83b672a5 AM |
38482 | + file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0, |
38483 | + /*wbrtop*/0); | |
7f207e10 AM |
38484 | + if (IS_ERR(file)) |
38485 | + goto out; | |
2000de60 | 38486 | + h_sb = file->f_path.dentry->d_sb; |
7f207e10 AM |
38487 | + if (unlikely(au_test_fs_bad_xino(h_sb))) { |
38488 | + pr_err("xino doesn't support %s(%s)\n", | |
38489 | + AUFS_XINO_DEFPATH, au_sbtype(h_sb)); | |
38490 | + fput(file); | |
38491 | + file = ERR_PTR(-EINVAL); | |
38492 | + } | |
7f207e10 | 38493 | + } |
0c5527e5 | 38494 | + |
7f207e10 AM |
38495 | +out: |
38496 | + return file; | |
38497 | +} | |
38498 | + | |
38499 | +/* ---------------------------------------------------------------------- */ | |
38500 | + | |
062440b3 AM |
38501 | +/* |
38502 | + * initialize the xinofile for the specified branch @br | |
38503 | + * at the place/path where @base_file indicates. | |
38504 | + * test whether another branch is on the same filesystem or not, | |
38505 | + * if found then share the xinofile with another branch. | |
38506 | + */ | |
38507 | +int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t h_ino, | |
38508 | + struct path *base) | |
7f207e10 AM |
38509 | +{ |
38510 | + int err; | |
062440b3 AM |
38511 | + struct au_xino_do_set_br args = { |
38512 | + .h_ino = h_ino, | |
38513 | + .br = br | |
38514 | + }; | |
7f207e10 | 38515 | + |
062440b3 AM |
38516 | + args.writef = au_sbi(sb)->si_xwrite; |
38517 | + args.bshared = sbr_find_shared(sb, /*btop*/0, au_sbbot(sb), | |
38518 | + au_br_sb(br)); | |
38519 | + err = au_xino_do_set_br(sb, base, &args); | |
79b8bda9 | 38520 | + if (unlikely(err)) |
062440b3 | 38521 | + au_xino_put(br); |
7f207e10 | 38522 | + |
7f207e10 AM |
38523 | + return err; |
38524 | +} | |
521ced18 JR |
38525 | + |
38526 | +/* ---------------------------------------------------------------------- */ | |
38527 | + | |
062440b3 AM |
38528 | +/* |
38529 | + * get an unused inode number from bitmap | |
38530 | + */ | |
38531 | +ino_t au_xino_new_ino(struct super_block *sb) | |
38532 | +{ | |
38533 | + ino_t ino; | |
38534 | + unsigned long *p, pindex, ul, pend; | |
38535 | + struct au_sbinfo *sbinfo; | |
38536 | + struct file *file; | |
38537 | + int free_bit, err; | |
38538 | + | |
38539 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
38540 | + return iunique(sb, AUFS_FIRST_INO); | |
38541 | + | |
38542 | + sbinfo = au_sbi(sb); | |
38543 | + mutex_lock(&sbinfo->si_xib_mtx); | |
38544 | + p = sbinfo->si_xib_buf; | |
38545 | + free_bit = sbinfo->si_xib_next_bit; | |
38546 | + if (free_bit < page_bits && !test_bit(free_bit, p)) | |
38547 | + goto out; /* success */ | |
38548 | + free_bit = find_first_zero_bit(p, page_bits); | |
38549 | + if (free_bit < page_bits) | |
38550 | + goto out; /* success */ | |
38551 | + | |
38552 | + pindex = sbinfo->si_xib_last_pindex; | |
38553 | + for (ul = pindex - 1; ul < ULONG_MAX; ul--) { | |
38554 | + err = xib_pindex(sb, ul); | |
38555 | + if (unlikely(err)) | |
38556 | + goto out_err; | |
38557 | + free_bit = find_first_zero_bit(p, page_bits); | |
38558 | + if (free_bit < page_bits) | |
38559 | + goto out; /* success */ | |
38560 | + } | |
38561 | + | |
38562 | + file = sbinfo->si_xib; | |
38563 | + pend = vfsub_f_size_read(file) / PAGE_SIZE; | |
38564 | + for (ul = pindex + 1; ul <= pend; ul++) { | |
38565 | + err = xib_pindex(sb, ul); | |
38566 | + if (unlikely(err)) | |
38567 | + goto out_err; | |
38568 | + free_bit = find_first_zero_bit(p, page_bits); | |
38569 | + if (free_bit < page_bits) | |
38570 | + goto out; /* success */ | |
38571 | + } | |
38572 | + BUG(); | |
38573 | + | |
38574 | +out: | |
38575 | + set_bit(free_bit, p); | |
38576 | + sbinfo->si_xib_next_bit = free_bit + 1; | |
38577 | + pindex = sbinfo->si_xib_last_pindex; | |
38578 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
38579 | + ino = xib_calc_ino(pindex, free_bit); | |
38580 | + AuDbg("i%lu\n", (unsigned long)ino); | |
38581 | + return ino; | |
38582 | +out_err: | |
38583 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
38584 | + AuDbg("i0\n"); | |
38585 | + return 0; | |
38586 | +} | |
38587 | + | |
38588 | +/* for s_op->delete_inode() */ | |
38589 | +void au_xino_delete_inode(struct inode *inode, const int unlinked) | |
521ced18 | 38590 | +{ |
062440b3 AM |
38591 | + int err; |
38592 | + unsigned int mnt_flags; | |
38593 | + aufs_bindex_t bindex, bbot, bi; | |
38594 | + unsigned char try_trunc; | |
38595 | + struct au_iinfo *iinfo; | |
38596 | + struct super_block *sb; | |
38597 | + struct au_hinode *hi; | |
38598 | + struct inode *h_inode; | |
38599 | + struct au_branch *br; | |
38600 | + vfs_writef_t xwrite; | |
acd2b654 AM |
38601 | + struct au_xi_calc calc; |
38602 | + struct file *file; | |
521ced18 | 38603 | + |
062440b3 | 38604 | + AuDebugOn(au_is_bad_inode(inode)); |
521ced18 | 38605 | + |
062440b3 AM |
38606 | + sb = inode->i_sb; |
38607 | + mnt_flags = au_mntflags(sb); | |
38608 | + if (!au_opt_test(mnt_flags, XINO) | |
38609 | + || inode->i_ino == AUFS_ROOT_INO) | |
38610 | + return; | |
38611 | + | |
38612 | + if (unlinked) { | |
38613 | + au_xigen_inc(inode); | |
38614 | + au_xib_clear_bit(inode); | |
38615 | + } | |
38616 | + | |
38617 | + iinfo = au_ii(inode); | |
38618 | + bindex = iinfo->ii_btop; | |
38619 | + if (bindex < 0) | |
38620 | + return; | |
38621 | + | |
38622 | + xwrite = au_sbi(sb)->si_xwrite; | |
38623 | + try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO); | |
38624 | + hi = au_hinode(iinfo, bindex); | |
38625 | + bbot = iinfo->ii_bbot; | |
38626 | + for (; bindex <= bbot; bindex++, hi++) { | |
38627 | + h_inode = hi->hi_inode; | |
38628 | + if (!h_inode | |
38629 | + || (!unlinked && h_inode->i_nlink)) | |
38630 | + continue; | |
38631 | + | |
38632 | + /* inode may not be revalidated */ | |
38633 | + bi = au_br_index(sb, hi->hi_id); | |
38634 | + if (bi < 0) | |
38635 | + continue; | |
38636 | + | |
38637 | + br = au_sbr(sb, bi); | |
acd2b654 AM |
38638 | + au_xi_calc(sb, h_inode->i_ino, &calc); |
38639 | + file = au_xino_file(br->br_xino, calc.idx); | |
38640 | + if (IS_ERR_OR_NULL(file)) | |
38641 | + continue; | |
38642 | + | |
38643 | + err = au_xino_do_write(xwrite, file, &calc, /*ino*/0); | |
062440b3 AM |
38644 | + if (!err && try_trunc |
38645 | + && au_test_fs_trunc_xino(au_br_sb(br))) | |
38646 | + xino_try_trunc(sb, br); | |
38647 | + } | |
521ced18 JR |
38648 | +} |
38649 | + | |
062440b3 AM |
38650 | +/* ---------------------------------------------------------------------- */ |
38651 | + | |
38652 | +static int au_xinondir_find(struct au_xino *xi, ino_t h_ino) | |
521ced18 JR |
38653 | +{ |
38654 | + int found, total, i; | |
38655 | + | |
38656 | + found = -1; | |
062440b3 | 38657 | + total = xi->xi_nondir.total; |
521ced18 | 38658 | + for (i = 0; i < total; i++) { |
062440b3 | 38659 | + if (xi->xi_nondir.array[i] != h_ino) |
521ced18 JR |
38660 | + continue; |
38661 | + found = i; | |
38662 | + break; | |
38663 | + } | |
38664 | + | |
38665 | + return found; | |
38666 | +} | |
38667 | + | |
062440b3 | 38668 | +static int au_xinondir_expand(struct au_xino *xi) |
521ced18 JR |
38669 | +{ |
38670 | + int err, sz; | |
38671 | + ino_t *p; | |
38672 | + | |
38673 | + BUILD_BUG_ON(KMALLOC_MAX_SIZE > INT_MAX); | |
38674 | + | |
38675 | + err = -ENOMEM; | |
062440b3 | 38676 | + sz = xi->xi_nondir.total * sizeof(ino_t); |
521ced18 JR |
38677 | + if (unlikely(sz > KMALLOC_MAX_SIZE / 2)) |
38678 | + goto out; | |
062440b3 | 38679 | + p = au_kzrealloc(xi->xi_nondir.array, sz, sz << 1, GFP_ATOMIC, |
521ced18 JR |
38680 | + /*may_shrink*/0); |
38681 | + if (p) { | |
062440b3 AM |
38682 | + xi->xi_nondir.array = p; |
38683 | + xi->xi_nondir.total <<= 1; | |
38684 | + AuDbg("xi_nondir.total %d\n", xi->xi_nondir.total); | |
521ced18 JR |
38685 | + err = 0; |
38686 | + } | |
38687 | + | |
38688 | +out: | |
38689 | + return err; | |
38690 | +} | |
38691 | + | |
062440b3 AM |
38692 | +void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, |
38693 | + ino_t h_ino, int idx) | |
38694 | +{ | |
38695 | + struct au_xino *xi; | |
38696 | + | |
38697 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); | |
38698 | + xi = au_sbr(sb, bindex)->br_xino; | |
38699 | + AuDebugOn(idx < 0 || xi->xi_nondir.total <= idx); | |
38700 | + | |
38701 | + spin_lock(&xi->xi_nondir.spin); | |
38702 | + AuDebugOn(xi->xi_nondir.array[idx] != h_ino); | |
38703 | + xi->xi_nondir.array[idx] = 0; | |
38704 | + spin_unlock(&xi->xi_nondir.spin); | |
38705 | + wake_up_all(&xi->xi_nondir.wqh); | |
38706 | +} | |
38707 | + | |
521ced18 JR |
38708 | +int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
38709 | + int *idx) | |
38710 | +{ | |
38711 | + int err, found, empty; | |
062440b3 | 38712 | + struct au_xino *xi; |
521ced18 JR |
38713 | + |
38714 | + err = 0; | |
38715 | + *idx = -1; | |
38716 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
38717 | + goto out; /* no xino */ | |
38718 | + | |
062440b3 | 38719 | + xi = au_sbr(sb, bindex)->br_xino; |
521ced18 JR |
38720 | + |
38721 | +again: | |
062440b3 AM |
38722 | + spin_lock(&xi->xi_nondir.spin); |
38723 | + found = au_xinondir_find(xi, h_ino); | |
521ced18 | 38724 | + if (found == -1) { |
062440b3 | 38725 | + empty = au_xinondir_find(xi, /*h_ino*/0); |
521ced18 | 38726 | + if (empty == -1) { |
062440b3 AM |
38727 | + empty = xi->xi_nondir.total; |
38728 | + err = au_xinondir_expand(xi); | |
521ced18 JR |
38729 | + if (unlikely(err)) |
38730 | + goto out_unlock; | |
38731 | + } | |
062440b3 | 38732 | + xi->xi_nondir.array[empty] = h_ino; |
521ced18 JR |
38733 | + *idx = empty; |
38734 | + } else { | |
062440b3 AM |
38735 | + spin_unlock(&xi->xi_nondir.spin); |
38736 | + wait_event(xi->xi_nondir.wqh, | |
38737 | + xi->xi_nondir.array[found] != h_ino); | |
521ced18 JR |
38738 | + goto again; |
38739 | + } | |
38740 | + | |
38741 | +out_unlock: | |
062440b3 AM |
38742 | + spin_unlock(&xi->xi_nondir.spin); |
38743 | +out: | |
38744 | + return err; | |
38745 | +} | |
38746 | + | |
38747 | +/* ---------------------------------------------------------------------- */ | |
38748 | + | |
38749 | +int au_xino_path(struct seq_file *seq, struct file *file) | |
38750 | +{ | |
38751 | + int err; | |
38752 | + | |
38753 | + err = au_seq_path(seq, &file->f_path); | |
38754 | + if (unlikely(err)) | |
38755 | + goto out; | |
38756 | + | |
38757 | +#define Deleted "\\040(deleted)" | |
38758 | + seq->count -= sizeof(Deleted) - 1; | |
38759 | + AuDebugOn(memcmp(seq->buf + seq->count, Deleted, | |
38760 | + sizeof(Deleted) - 1)); | |
38761 | +#undef Deleted | |
38762 | + | |
521ced18 JR |
38763 | +out: |
38764 | + return err; | |
38765 | +} | |
537831f9 | 38766 | diff -urN /usr/share/empty/include/uapi/linux/aufs_type.h linux/include/uapi/linux/aufs_type.h |
eca34b5c | 38767 | --- /usr/share/empty/include/uapi/linux/aufs_type.h 1970-01-01 01:00:00.000000000 +0100 |
016522bc | 38768 | +++ linux/include/uapi/linux/aufs_type.h 2020-04-03 08:16:49.834195677 +0200 |
eca34b5c AM |
38769 | @@ -0,0 +1,452 @@ |
38770 | +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */ | |
7f207e10 | 38771 | +/* |
016522bc | 38772 | + * Copyright (C) 2005-2020 Junjiro R. Okajima |
7f207e10 AM |
38773 | + * |
38774 | + * This program, aufs is free software; you can redistribute it and/or modify | |
38775 | + * it under the terms of the GNU General Public License as published by | |
38776 | + * the Free Software Foundation; either version 2 of the License, or | |
38777 | + * (at your option) any later version. | |
38778 | + * | |
38779 | + * This program is distributed in the hope that it will be useful, | |
38780 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
38781 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
38782 | + * GNU General Public License for more details. | |
38783 | + * | |
38784 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 38785 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
38786 | + */ |
38787 | + | |
38788 | +#ifndef __AUFS_TYPE_H__ | |
38789 | +#define __AUFS_TYPE_H__ | |
38790 | + | |
f6c5ef8b AM |
38791 | +#define AUFS_NAME "aufs" |
38792 | + | |
9dbd164d | 38793 | +#ifdef __KERNEL__ |
f6c5ef8b AM |
38794 | +/* |
38795 | + * define it before including all other headers. | |
38796 | + * sched.h may use pr_* macros before defining "current", so define the | |
38797 | + * no-current version first, and re-define later. | |
38798 | + */ | |
38799 | +#define pr_fmt(fmt) AUFS_NAME " %s:%d: " fmt, __func__, __LINE__ | |
38800 | +#include <linux/sched.h> | |
38801 | +#undef pr_fmt | |
a2a7ad62 AM |
38802 | +#define pr_fmt(fmt) \ |
38803 | + AUFS_NAME " %s:%d:%.*s[%d]: " fmt, __func__, __LINE__, \ | |
38804 | + (int)sizeof(current->comm), current->comm, current->pid | |
43982f53 | 38805 | +#include <linux/limits.h> |
9dbd164d AM |
38806 | +#else |
38807 | +#include <stdint.h> | |
38808 | +#include <sys/types.h> | |
43982f53 | 38809 | +#include <limits.h> |
f6c5ef8b | 38810 | +#endif /* __KERNEL__ */ |
7f207e10 | 38811 | + |
016522bc | 38812 | +#define AUFS_VERSION "5.4-20200302" |
7f207e10 AM |
38813 | + |
38814 | +/* todo? move this to linux-2.6.19/include/magic.h */ | |
38815 | +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') | |
38816 | + | |
38817 | +/* ---------------------------------------------------------------------- */ | |
38818 | + | |
43982f53 | 38819 | +#ifdef __KERNEL__ |
7f207e10 | 38820 | +#ifdef CONFIG_AUFS_BRANCH_MAX_127 |
9dbd164d | 38821 | +typedef int8_t aufs_bindex_t; |
7f207e10 AM |
38822 | +#define AUFS_BRANCH_MAX 127 |
38823 | +#else | |
9dbd164d | 38824 | +typedef int16_t aufs_bindex_t; |
7f207e10 AM |
38825 | +#ifdef CONFIG_AUFS_BRANCH_MAX_511 |
38826 | +#define AUFS_BRANCH_MAX 511 | |
38827 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) | |
38828 | +#define AUFS_BRANCH_MAX 1023 | |
38829 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) | |
38830 | +#define AUFS_BRANCH_MAX 32767 | |
38831 | +#endif | |
38832 | +#endif | |
38833 | + | |
7f207e10 AM |
38834 | +#ifndef AUFS_BRANCH_MAX |
38835 | +#error unknown CONFIG_AUFS_BRANCH_MAX value | |
38836 | +#endif | |
38837 | +#endif /* __KERNEL__ */ | |
38838 | + | |
38839 | +/* ---------------------------------------------------------------------- */ | |
38840 | + | |
7f207e10 AM |
38841 | +#define AUFS_FSTYPE AUFS_NAME |
38842 | + | |
38843 | +#define AUFS_ROOT_INO 2 | |
38844 | +#define AUFS_FIRST_INO 11 | |
38845 | + | |
38846 | +#define AUFS_WH_PFX ".wh." | |
38847 | +#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) | |
38848 | +#define AUFS_WH_TMP_LEN 4 | |
86dc4139 | 38849 | +/* a limit for rmdir/rename a dir and copyup */ |
7f207e10 AM |
38850 | +#define AUFS_MAX_NAMELEN (NAME_MAX \ |
38851 | + - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ | |
38852 | + - 1 /* dot */\ | |
38853 | + - AUFS_WH_TMP_LEN) /* hex */ | |
38854 | +#define AUFS_XINO_FNAME "." AUFS_NAME ".xino" | |
38855 | +#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME | |
392086de AM |
38856 | +#define AUFS_XINO_DEF_SEC 30 /* seconds */ |
38857 | +#define AUFS_XINO_DEF_TRUNC 45 /* percentage */ | |
7f207e10 AM |
38858 | +#define AUFS_DIRWH_DEF 3 |
38859 | +#define AUFS_RDCACHE_DEF 10 /* seconds */ | |
027c5e7a | 38860 | +#define AUFS_RDCACHE_MAX 3600 /* seconds */ |
7f207e10 AM |
38861 | +#define AUFS_RDBLK_DEF 512 /* bytes */ |
38862 | +#define AUFS_RDHASH_DEF 32 | |
38863 | +#define AUFS_WKQ_NAME AUFS_NAME "d" | |
027c5e7a AM |
38864 | +#define AUFS_MFS_DEF_SEC 30 /* seconds */ |
38865 | +#define AUFS_MFS_MAX_SEC 3600 /* seconds */ | |
076b876e | 38866 | +#define AUFS_FHSM_CACHE_DEF_SEC 30 /* seconds */ |
86dc4139 | 38867 | +#define AUFS_PLINK_WARN 50 /* number of plinks in a single bucket */ |
7f207e10 AM |
38868 | + |
38869 | +/* pseudo-link maintenace under /proc */ | |
38870 | +#define AUFS_PLINK_MAINT_NAME "plink_maint" | |
38871 | +#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME | |
38872 | +#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME | |
38873 | + | |
8b6a4947 AM |
38874 | +/* dirren, renamed dir */ |
38875 | +#define AUFS_DR_INFO_PFX AUFS_WH_PFX ".dr." | |
38876 | +#define AUFS_DR_BRHINO_NAME AUFS_WH_PFX "hino" | |
38877 | +/* whiteouted doubly */ | |
38878 | +#define AUFS_WH_DR_INFO_PFX AUFS_WH_PFX AUFS_DR_INFO_PFX | |
38879 | +#define AUFS_WH_DR_BRHINO AUFS_WH_PFX AUFS_DR_BRHINO_NAME | |
38880 | + | |
7f207e10 AM |
38881 | +#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ |
38882 | +#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME | |
38883 | + | |
38884 | +#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME | |
38885 | +#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" | |
38886 | +#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" | |
38887 | + | |
38888 | +/* doubly whiteouted */ | |
38889 | +#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME | |
38890 | +#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME | |
38891 | +#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME | |
38892 | + | |
1e00d052 | 38893 | +/* branch permissions and attributes */ |
7f207e10 AM |
38894 | +#define AUFS_BRPERM_RW "rw" |
38895 | +#define AUFS_BRPERM_RO "ro" | |
38896 | +#define AUFS_BRPERM_RR "rr" | |
076b876e AM |
38897 | +#define AUFS_BRATTR_COO_REG "coo_reg" |
38898 | +#define AUFS_BRATTR_COO_ALL "coo_all" | |
38899 | +#define AUFS_BRATTR_FHSM "fhsm" | |
38900 | +#define AUFS_BRATTR_UNPIN "unpin" | |
c1595e42 JR |
38901 | +#define AUFS_BRATTR_ICEX "icex" |
38902 | +#define AUFS_BRATTR_ICEX_SEC "icexsec" | |
38903 | +#define AUFS_BRATTR_ICEX_SYS "icexsys" | |
38904 | +#define AUFS_BRATTR_ICEX_TR "icextr" | |
38905 | +#define AUFS_BRATTR_ICEX_USR "icexusr" | |
38906 | +#define AUFS_BRATTR_ICEX_OTH "icexoth" | |
1e00d052 AM |
38907 | +#define AUFS_BRRATTR_WH "wh" |
38908 | +#define AUFS_BRWATTR_NLWH "nolwh" | |
076b876e AM |
38909 | +#define AUFS_BRWATTR_MOO "moo" |
38910 | + | |
38911 | +#define AuBrPerm_RW 1 /* writable, hardlinkable wh */ | |
38912 | +#define AuBrPerm_RO (1 << 1) /* readonly */ | |
38913 | +#define AuBrPerm_RR (1 << 2) /* natively readonly */ | |
38914 | +#define AuBrPerm_Mask (AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR) | |
38915 | + | |
38916 | +#define AuBrAttr_COO_REG (1 << 3) /* copy-up on open */ | |
38917 | +#define AuBrAttr_COO_ALL (1 << 4) | |
38918 | +#define AuBrAttr_COO_Mask (AuBrAttr_COO_REG | AuBrAttr_COO_ALL) | |
38919 | + | |
38920 | +#define AuBrAttr_FHSM (1 << 5) /* file-based hsm */ | |
38921 | +#define AuBrAttr_UNPIN (1 << 6) /* rename-able top dir of | |
c1595e42 JR |
38922 | + branch. meaningless since |
38923 | + linux-3.18-rc1 */ | |
38924 | + | |
38925 | +/* ignore error in copying XATTR */ | |
38926 | +#define AuBrAttr_ICEX_SEC (1 << 7) | |
38927 | +#define AuBrAttr_ICEX_SYS (1 << 8) | |
38928 | +#define AuBrAttr_ICEX_TR (1 << 9) | |
38929 | +#define AuBrAttr_ICEX_USR (1 << 10) | |
38930 | +#define AuBrAttr_ICEX_OTH (1 << 11) | |
38931 | +#define AuBrAttr_ICEX (AuBrAttr_ICEX_SEC \ | |
38932 | + | AuBrAttr_ICEX_SYS \ | |
38933 | + | AuBrAttr_ICEX_TR \ | |
38934 | + | AuBrAttr_ICEX_USR \ | |
38935 | + | AuBrAttr_ICEX_OTH) | |
38936 | + | |
38937 | +#define AuBrRAttr_WH (1 << 12) /* whiteout-able */ | |
076b876e AM |
38938 | +#define AuBrRAttr_Mask AuBrRAttr_WH |
38939 | + | |
c1595e42 JR |
38940 | +#define AuBrWAttr_NoLinkWH (1 << 13) /* un-hardlinkable whiteouts */ |
38941 | +#define AuBrWAttr_MOO (1 << 14) /* move-up on open */ | |
076b876e AM |
38942 | +#define AuBrWAttr_Mask (AuBrWAttr_NoLinkWH | AuBrWAttr_MOO) |
38943 | + | |
38944 | +#define AuBrAttr_CMOO_Mask (AuBrAttr_COO_Mask | AuBrWAttr_MOO) | |
38945 | + | |
c1595e42 | 38946 | +/* #warning test userspace */ |
076b876e AM |
38947 | +#ifdef __KERNEL__ |
38948 | +#ifndef CONFIG_AUFS_FHSM | |
38949 | +#undef AuBrAttr_FHSM | |
38950 | +#define AuBrAttr_FHSM 0 | |
38951 | +#endif | |
c1595e42 JR |
38952 | +#ifndef CONFIG_AUFS_XATTR |
38953 | +#undef AuBrAttr_ICEX | |
38954 | +#define AuBrAttr_ICEX 0 | |
38955 | +#undef AuBrAttr_ICEX_SEC | |
38956 | +#define AuBrAttr_ICEX_SEC 0 | |
38957 | +#undef AuBrAttr_ICEX_SYS | |
38958 | +#define AuBrAttr_ICEX_SYS 0 | |
38959 | +#undef AuBrAttr_ICEX_TR | |
38960 | +#define AuBrAttr_ICEX_TR 0 | |
38961 | +#undef AuBrAttr_ICEX_USR | |
38962 | +#define AuBrAttr_ICEX_USR 0 | |
38963 | +#undef AuBrAttr_ICEX_OTH | |
38964 | +#define AuBrAttr_ICEX_OTH 0 | |
38965 | +#endif | |
076b876e AM |
38966 | +#endif |
38967 | + | |
38968 | +/* the longest combination */ | |
c1595e42 JR |
38969 | +/* AUFS_BRATTR_ICEX and AUFS_BRATTR_ICEX_TR don't affect here */ |
38970 | +#define AuBrPermStrSz sizeof(AUFS_BRPERM_RW \ | |
38971 | + "+" AUFS_BRATTR_COO_REG \ | |
38972 | + "+" AUFS_BRATTR_FHSM \ | |
38973 | + "+" AUFS_BRATTR_UNPIN \ | |
7e9cd9fe AM |
38974 | + "+" AUFS_BRATTR_ICEX_SEC \ |
38975 | + "+" AUFS_BRATTR_ICEX_SYS \ | |
38976 | + "+" AUFS_BRATTR_ICEX_USR \ | |
38977 | + "+" AUFS_BRATTR_ICEX_OTH \ | |
076b876e AM |
38978 | + "+" AUFS_BRWATTR_NLWH) |
38979 | + | |
38980 | +typedef struct { | |
38981 | + char a[AuBrPermStrSz]; | |
38982 | +} au_br_perm_str_t; | |
38983 | + | |
38984 | +static inline int au_br_writable(int brperm) | |
38985 | +{ | |
38986 | + return brperm & AuBrPerm_RW; | |
38987 | +} | |
38988 | + | |
38989 | +static inline int au_br_whable(int brperm) | |
38990 | +{ | |
38991 | + return brperm & (AuBrPerm_RW | AuBrRAttr_WH); | |
38992 | +} | |
38993 | + | |
38994 | +static inline int au_br_wh_linkable(int brperm) | |
38995 | +{ | |
38996 | + return !(brperm & AuBrWAttr_NoLinkWH); | |
38997 | +} | |
38998 | + | |
38999 | +static inline int au_br_cmoo(int brperm) | |
39000 | +{ | |
39001 | + return brperm & AuBrAttr_CMOO_Mask; | |
39002 | +} | |
39003 | + | |
39004 | +static inline int au_br_fhsm(int brperm) | |
39005 | +{ | |
39006 | + return brperm & AuBrAttr_FHSM; | |
39007 | +} | |
7f207e10 AM |
39008 | + |
39009 | +/* ---------------------------------------------------------------------- */ | |
39010 | + | |
39011 | +/* ioctl */ | |
39012 | +enum { | |
39013 | + /* readdir in userspace */ | |
39014 | + AuCtl_RDU, | |
39015 | + AuCtl_RDU_INO, | |
39016 | + | |
076b876e AM |
39017 | + AuCtl_WBR_FD, /* pathconf wrapper */ |
39018 | + AuCtl_IBUSY, /* busy inode */ | |
39019 | + AuCtl_MVDOWN, /* move-down */ | |
39020 | + AuCtl_BR, /* info about branches */ | |
39021 | + AuCtl_FHSM_FD /* connection for fhsm */ | |
7f207e10 AM |
39022 | +}; |
39023 | + | |
39024 | +/* borrowed from linux/include/linux/kernel.h */ | |
39025 | +#ifndef ALIGN | |
eca34b5c | 39026 | +#ifdef _GNU_SOURCE |
7f207e10 | 39027 | +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) |
eca34b5c AM |
39028 | +#else |
39029 | +#define ALIGN(x, a) (((x) + (a) - 1) & ~((a) - 1)) | |
39030 | +#endif | |
7f207e10 AM |
39031 | +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) |
39032 | +#endif | |
39033 | + | |
39034 | +/* borrowed from linux/include/linux/compiler-gcc3.h */ | |
39035 | +#ifndef __aligned | |
39036 | +#define __aligned(x) __attribute__((aligned(x))) | |
53392da6 AM |
39037 | +#endif |
39038 | + | |
39039 | +#ifdef __KERNEL__ | |
39040 | +#ifndef __packed | |
7f207e10 AM |
39041 | +#define __packed __attribute__((packed)) |
39042 | +#endif | |
53392da6 | 39043 | +#endif |
7f207e10 AM |
39044 | + |
39045 | +struct au_rdu_cookie { | |
9dbd164d AM |
39046 | + uint64_t h_pos; |
39047 | + int16_t bindex; | |
39048 | + uint8_t flags; | |
39049 | + uint8_t pad; | |
39050 | + uint32_t generation; | |
7f207e10 AM |
39051 | +} __aligned(8); |
39052 | + | |
39053 | +struct au_rdu_ent { | |
9dbd164d AM |
39054 | + uint64_t ino; |
39055 | + int16_t bindex; | |
39056 | + uint8_t type; | |
39057 | + uint8_t nlen; | |
39058 | + uint8_t wh; | |
7f207e10 AM |
39059 | + char name[0]; |
39060 | +} __aligned(8); | |
39061 | + | |
39062 | +static inline int au_rdu_len(int nlen) | |
39063 | +{ | |
39064 | + /* include the terminating NULL */ | |
39065 | + return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, | |
9dbd164d | 39066 | + sizeof(uint64_t)); |
7f207e10 AM |
39067 | +} |
39068 | + | |
39069 | +union au_rdu_ent_ul { | |
39070 | + struct au_rdu_ent __user *e; | |
9dbd164d | 39071 | + uint64_t ul; |
7f207e10 AM |
39072 | +}; |
39073 | + | |
39074 | +enum { | |
39075 | + AufsCtlRduV_SZ, | |
39076 | + AufsCtlRduV_End | |
39077 | +}; | |
39078 | + | |
39079 | +struct aufs_rdu { | |
39080 | + /* input */ | |
39081 | + union { | |
9dbd164d AM |
39082 | + uint64_t sz; /* AuCtl_RDU */ |
39083 | + uint64_t nent; /* AuCtl_RDU_INO */ | |
7f207e10 AM |
39084 | + }; |
39085 | + union au_rdu_ent_ul ent; | |
9dbd164d | 39086 | + uint16_t verify[AufsCtlRduV_End]; |
7f207e10 AM |
39087 | + |
39088 | + /* input/output */ | |
9dbd164d | 39089 | + uint32_t blk; |
7f207e10 AM |
39090 | + |
39091 | + /* output */ | |
39092 | + union au_rdu_ent_ul tail; | |
39093 | + /* number of entries which were added in a single call */ | |
9dbd164d AM |
39094 | + uint64_t rent; |
39095 | + uint8_t full; | |
39096 | + uint8_t shwh; | |
7f207e10 AM |
39097 | + |
39098 | + struct au_rdu_cookie cookie; | |
39099 | +} __aligned(8); | |
39100 | + | |
1e00d052 AM |
39101 | +/* ---------------------------------------------------------------------- */ |
39102 | + | |
8b6a4947 AM |
39103 | +/* dirren. the branch is identified by the filename who contains this */ |
39104 | +struct au_drinfo { | |
39105 | + uint64_t ino; | |
39106 | + union { | |
39107 | + uint8_t oldnamelen; | |
39108 | + uint64_t _padding; | |
39109 | + }; | |
39110 | + uint8_t oldname[0]; | |
39111 | +} __aligned(8); | |
39112 | + | |
39113 | +struct au_drinfo_fdata { | |
39114 | + uint32_t magic; | |
39115 | + struct au_drinfo drinfo; | |
39116 | +} __aligned(8); | |
39117 | + | |
39118 | +#define AUFS_DRINFO_MAGIC_V1 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x01) | |
39119 | +/* future */ | |
39120 | +#define AUFS_DRINFO_MAGIC_V2 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x02) | |
39121 | + | |
39122 | +/* ---------------------------------------------------------------------- */ | |
39123 | + | |
1e00d052 | 39124 | +struct aufs_wbr_fd { |
9dbd164d AM |
39125 | + uint32_t oflags; |
39126 | + int16_t brid; | |
1e00d052 AM |
39127 | +} __aligned(8); |
39128 | + | |
39129 | +/* ---------------------------------------------------------------------- */ | |
39130 | + | |
027c5e7a | 39131 | +struct aufs_ibusy { |
9dbd164d AM |
39132 | + uint64_t ino, h_ino; |
39133 | + int16_t bindex; | |
027c5e7a AM |
39134 | +} __aligned(8); |
39135 | + | |
1e00d052 AM |
39136 | +/* ---------------------------------------------------------------------- */ |
39137 | + | |
392086de AM |
39138 | +/* error code for move-down */ |
39139 | +/* the actual message strings are implemented in aufs-util.git */ | |
39140 | +enum { | |
39141 | + EAU_MVDOWN_OPAQUE = 1, | |
39142 | + EAU_MVDOWN_WHITEOUT, | |
39143 | + EAU_MVDOWN_UPPER, | |
39144 | + EAU_MVDOWN_BOTTOM, | |
39145 | + EAU_MVDOWN_NOUPPER, | |
39146 | + EAU_MVDOWN_NOLOWERBR, | |
39147 | + EAU_Last | |
39148 | +}; | |
39149 | + | |
c2b27bf2 | 39150 | +/* flags for move-down */ |
392086de AM |
39151 | +#define AUFS_MVDOWN_DMSG 1 |
39152 | +#define AUFS_MVDOWN_OWLOWER (1 << 1) /* overwrite lower */ | |
39153 | +#define AUFS_MVDOWN_KUPPER (1 << 2) /* keep upper */ | |
39154 | +#define AUFS_MVDOWN_ROLOWER (1 << 3) /* do even if lower is RO */ | |
39155 | +#define AUFS_MVDOWN_ROLOWER_R (1 << 4) /* did on lower RO */ | |
39156 | +#define AUFS_MVDOWN_ROUPPER (1 << 5) /* do even if upper is RO */ | |
39157 | +#define AUFS_MVDOWN_ROUPPER_R (1 << 6) /* did on upper RO */ | |
39158 | +#define AUFS_MVDOWN_BRID_UPPER (1 << 7) /* upper brid */ | |
39159 | +#define AUFS_MVDOWN_BRID_LOWER (1 << 8) /* lower brid */ | |
076b876e AM |
39160 | +#define AUFS_MVDOWN_FHSM_LOWER (1 << 9) /* find fhsm attr for lower */ |
39161 | +#define AUFS_MVDOWN_STFS (1 << 10) /* req. stfs */ | |
39162 | +#define AUFS_MVDOWN_STFS_FAILED (1 << 11) /* output: stfs is unusable */ | |
39163 | +#define AUFS_MVDOWN_BOTTOM (1 << 12) /* output: no more lowers */ | |
c2b27bf2 | 39164 | + |
076b876e | 39165 | +/* index for move-down */ |
392086de AM |
39166 | +enum { |
39167 | + AUFS_MVDOWN_UPPER, | |
39168 | + AUFS_MVDOWN_LOWER, | |
39169 | + AUFS_MVDOWN_NARRAY | |
39170 | +}; | |
39171 | + | |
076b876e AM |
39172 | +/* |
39173 | + * additional info of move-down | |
39174 | + * number of free blocks and inodes. | |
39175 | + * subset of struct kstatfs, but smaller and always 64bit. | |
39176 | + */ | |
39177 | +struct aufs_stfs { | |
39178 | + uint64_t f_blocks; | |
39179 | + uint64_t f_bavail; | |
39180 | + uint64_t f_files; | |
39181 | + uint64_t f_ffree; | |
39182 | +}; | |
39183 | + | |
39184 | +struct aufs_stbr { | |
39185 | + int16_t brid; /* optional input */ | |
39186 | + int16_t bindex; /* output */ | |
39187 | + struct aufs_stfs stfs; /* output when AUFS_MVDOWN_STFS set */ | |
39188 | +} __aligned(8); | |
39189 | + | |
c2b27bf2 | 39190 | +struct aufs_mvdown { |
076b876e AM |
39191 | + uint32_t flags; /* input/output */ |
39192 | + struct aufs_stbr stbr[AUFS_MVDOWN_NARRAY]; /* input/output */ | |
39193 | + int8_t au_errno; /* output */ | |
39194 | +} __aligned(8); | |
39195 | + | |
39196 | +/* ---------------------------------------------------------------------- */ | |
39197 | + | |
39198 | +union aufs_brinfo { | |
39199 | + /* PATH_MAX may differ between kernel-space and user-space */ | |
39200 | + char _spacer[4096]; | |
392086de | 39201 | + struct { |
076b876e AM |
39202 | + int16_t id; |
39203 | + int perm; | |
39204 | + char path[0]; | |
39205 | + }; | |
c2b27bf2 AM |
39206 | +} __aligned(8); |
39207 | + | |
39208 | +/* ---------------------------------------------------------------------- */ | |
39209 | + | |
7f207e10 AM |
39210 | +#define AuCtlType 'A' |
39211 | +#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) | |
39212 | +#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) | |
1e00d052 AM |
39213 | +#define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \ |
39214 | + struct aufs_wbr_fd) | |
027c5e7a | 39215 | +#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) |
392086de AM |
39216 | +#define AUFS_CTL_MVDOWN _IOWR(AuCtlType, AuCtl_MVDOWN, \ |
39217 | + struct aufs_mvdown) | |
076b876e AM |
39218 | +#define AUFS_CTL_BRINFO _IOW(AuCtlType, AuCtl_BR, union aufs_brinfo) |
39219 | +#define AUFS_CTL_FHSM_FD _IOW(AuCtlType, AuCtl_FHSM_FD, int) | |
7f207e10 AM |
39220 | + |
39221 | +#endif /* __AUFS_TYPE_H__ */ | |
2121bcd9 | 39222 | SPDX-License-Identifier: GPL-2.0 |
43982f53 | 39223 | aufs5.4 loopback patch |
5527c038 JR |
39224 | |
39225 | diff --git a/drivers/block/loop.c b/drivers/block/loop.c | |
43982f53 | 39226 | index 5e094699215e..22b2ecb6cfe8 100644 |
5527c038 JR |
39227 | --- a/drivers/block/loop.c |
39228 | +++ b/drivers/block/loop.c | |
eca34b5c | 39229 | @@ -625,6 +625,15 @@ static inline void loop_update_dio(struct loop_device *lo) |
8b6a4947 | 39230 | lo->use_dio); |
5527c038 JR |
39231 | } |
39232 | ||
5527c038 JR |
39233 | +static struct file *loop_real_file(struct file *file) |
39234 | +{ | |
39235 | + struct file *f = NULL; | |
39236 | + | |
39237 | + if (file->f_path.dentry->d_sb->s_op->real_loop) | |
39238 | + f = file->f_path.dentry->d_sb->s_op->real_loop(file); | |
39239 | + return f; | |
8b6a4947 AM |
39240 | +} |
39241 | + | |
c2c0f25c | 39242 | static void loop_reread_partitions(struct loop_device *lo, |
8b6a4947 AM |
39243 | struct block_device *bdev) |
39244 | { | |
eca34b5c | 39245 | @@ -678,6 +687,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
5527c038 JR |
39246 | unsigned int arg) |
39247 | { | |
e1106418 | 39248 | struct file *file = NULL, *old_file; |
5527c038 | 39249 | + struct file *f, *virt_file = NULL, *old_virt_file; |
5527c038 | 39250 | int error; |
ba1aed25 | 39251 | bool partscan; |
5527c038 | 39252 | |
eca34b5c | 39253 | @@ -697,12 +707,19 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
cd7a4cd9 AM |
39254 | file = fget(arg); |
39255 | if (!file) | |
e1106418 | 39256 | goto out_err; |
5527c038 JR |
39257 | + f = loop_real_file(file); |
39258 | + if (f) { | |
39259 | + virt_file = file; | |
39260 | + file = f; | |
39261 | + get_file(file); | |
39262 | + } | |
39263 | ||
cd7a4cd9 AM |
39264 | error = loop_validate_file(file, bdev); |
39265 | if (error) | |
e1106418 | 39266 | goto out_err; |
cd7a4cd9 | 39267 | |
5527c038 JR |
39268 | old_file = lo->lo_backing_file; |
39269 | + old_virt_file = lo->lo_backing_virt_file; | |
39270 | ||
39271 | error = -EINVAL; | |
39272 | ||
eca34b5c | 39273 | @@ -714,6 +731,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
8b6a4947 AM |
39274 | blk_mq_freeze_queue(lo->lo_queue); |
39275 | mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask); | |
39276 | lo->lo_backing_file = file; | |
39277 | + lo->lo_backing_virt_file = virt_file; | |
39278 | lo->old_gfp_mask = mapping_gfp_mask(file->f_mapping); | |
39279 | mapping_set_gfp_mask(file->f_mapping, | |
39280 | lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS)); | |
eca34b5c | 39281 | @@ -727,6 +745,8 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
e1106418 JR |
39282 | * dependency. |
39283 | */ | |
5527c038 JR |
39284 | fput(old_file); |
39285 | + if (old_virt_file) | |
39286 | + fput(old_virt_file); | |
e1106418 | 39287 | if (partscan) |
c2c0f25c | 39288 | loop_reread_partitions(lo, bdev); |
5527c038 | 39289 | return 0; |
eca34b5c | 39290 | @@ -735,6 +755,8 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
e1106418 JR |
39291 | mutex_unlock(&loop_ctl_mutex); |
39292 | if (file) | |
39293 | fput(file); | |
5527c038 JR |
39294 | + if (virt_file) |
39295 | + fput(virt_file); | |
5527c038 JR |
39296 | return error; |
39297 | } | |
e1106418 | 39298 | |
eca34b5c | 39299 | @@ -939,7 +961,7 @@ static void loop_update_rotational(struct loop_device *lo) |
5527c038 JR |
39300 | static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
39301 | struct block_device *bdev, unsigned int arg) | |
39302 | { | |
062440b3 | 39303 | - struct file *file; |
5527c038 JR |
39304 | + struct file *file, *f, *virt_file = NULL; |
39305 | struct inode *inode; | |
39306 | struct address_space *mapping; | |
eca34b5c AM |
39307 | struct block_device *claimed_bdev = NULL; |
39308 | @@ -955,6 +977,12 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, | |
5527c038 JR |
39309 | file = fget(arg); |
39310 | if (!file) | |
39311 | goto out; | |
39312 | + f = loop_real_file(file); | |
39313 | + if (f) { | |
39314 | + virt_file = file; | |
39315 | + file = f; | |
39316 | + get_file(file); | |
39317 | + } | |
39318 | ||
fbc438ed JR |
39319 | /* |
39320 | * If we don't hold exclusive handle for the device, upgrade to it | |
eca34b5c | 39321 | @@ -1003,6 +1031,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
5527c038 JR |
39322 | lo->lo_device = bdev; |
39323 | lo->lo_flags = lo_flags; | |
39324 | lo->lo_backing_file = file; | |
39325 | + lo->lo_backing_virt_file = virt_file; | |
39326 | lo->transfer = NULL; | |
39327 | lo->ioctl = NULL; | |
39328 | lo->lo_sizelimit = 0; | |
43982f53 | 39329 | @@ -1056,6 +1085,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
eca34b5c | 39330 | bd_abort_claiming(bdev, claimed_bdev, loop_set_fd); |
e1106418 | 39331 | out_putf: |
5527c038 JR |
39332 | fput(file); |
39333 | + if (virt_file) | |
39334 | + fput(virt_file); | |
e1106418 | 39335 | out: |
5527c038 JR |
39336 | /* This is safe: open() is still holding a reference. */ |
39337 | module_put(THIS_MODULE); | |
43982f53 | 39338 | @@ -1102,6 +1133,7 @@ loop_init_xfer(struct loop_device *lo, struct loop_func_table *xfer, |
ba1aed25 | 39339 | static int __loop_clr_fd(struct loop_device *lo, bool release) |
5527c038 | 39340 | { |
e1106418 | 39341 | struct file *filp = NULL; |
5527c038 JR |
39342 | + struct file *virt_filp = lo->lo_backing_virt_file; |
39343 | gfp_t gfp = lo->old_gfp_mask; | |
39344 | struct block_device *bdev = lo->lo_device; | |
ba1aed25 | 39345 | int err = 0; |
43982f53 | 39346 | @@ -1125,6 +1157,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) |
5527c038 | 39347 | |
5527c038 | 39348 | spin_lock_irq(&lo->lo_lock); |
5527c038 JR |
39349 | lo->lo_backing_file = NULL; |
39350 | + lo->lo_backing_virt_file = NULL; | |
39351 | spin_unlock_irq(&lo->lo_lock); | |
39352 | ||
39353 | loop_release_xfer(lo); | |
43982f53 | 39354 | @@ -1207,6 +1240,8 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) |
5527c038 | 39355 | */ |
e1106418 JR |
39356 | if (filp) |
39357 | fput(filp); | |
5527c038 JR |
39358 | + if (virt_filp) |
39359 | + fput(virt_filp); | |
e1106418 | 39360 | return err; |
5527c038 JR |
39361 | } |
39362 | ||
39363 | diff --git a/drivers/block/loop.h b/drivers/block/loop.h | |
43982f53 | 39364 | index af75a5ee4094..1d847cb194ff 100644 |
5527c038 JR |
39365 | --- a/drivers/block/loop.h |
39366 | +++ b/drivers/block/loop.h | |
39367 | @@ -46,7 +46,7 @@ struct loop_device { | |
39368 | int (*ioctl)(struct loop_device *, int cmd, | |
39369 | unsigned long arg); | |
39370 | ||
39371 | - struct file * lo_backing_file; | |
43982f53 | 39372 | + struct file *lo_backing_file, *lo_backing_virt_file; |
5527c038 | 39373 | struct block_device *lo_device; |
5527c038 | 39374 | void *key_data; |
8b6a4947 | 39375 | |
5527c038 | 39376 | diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c |
016522bc | 39377 | index 6fb4a4ed8cc7..ba9a959f2db2 100644 |
5527c038 JR |
39378 | --- a/fs/aufs/f_op.c |
39379 | +++ b/fs/aufs/f_op.c | |
acd2b654 | 39380 | @@ -359,7 +359,7 @@ static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
5527c038 JR |
39381 | if (IS_ERR(h_file)) |
39382 | goto out; | |
39383 | ||
39384 | - if (au_test_loopback_kthread()) { | |
39385 | + if (0 && au_test_loopback_kthread()) { | |
39386 | au_warn_loopback(h_file->f_path.dentry->d_sb); | |
39387 | if (file->f_mapping != h_file->f_mapping) { | |
39388 | file->f_mapping = h_file->f_mapping; | |
39389 | diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c | |
016522bc | 39390 | index a8b63acc6204..9d97c3af5686 100644 |
5527c038 JR |
39391 | --- a/fs/aufs/loop.c |
39392 | +++ b/fs/aufs/loop.c | |
2121bcd9 | 39393 | @@ -133,3 +133,19 @@ void au_loopback_fin(void) |
79b8bda9 | 39394 | symbol_put(loop_backing_file); |
9f237c51 | 39395 | au_kfree_try_rcu(au_warn_loopback_array); |
5527c038 JR |
39396 | } |
39397 | + | |
39398 | +/* ---------------------------------------------------------------------- */ | |
39399 | + | |
39400 | +/* support the loopback block device insude aufs */ | |
39401 | + | |
39402 | +struct file *aufs_real_loop(struct file *file) | |
39403 | +{ | |
39404 | + struct file *f; | |
39405 | + | |
39406 | + BUG_ON(!au_test_aufs(file->f_path.dentry->d_sb)); | |
39407 | + fi_read_lock(file); | |
39408 | + f = au_hf_top(file); | |
39409 | + fi_read_unlock(file); | |
39410 | + AuDebugOn(!f); | |
39411 | + return f; | |
39412 | +} | |
39413 | diff --git a/fs/aufs/loop.h b/fs/aufs/loop.h | |
016522bc | 39414 | index 94f4f80ae33b..ca1194354aff 100644 |
5527c038 JR |
39415 | --- a/fs/aufs/loop.h |
39416 | +++ b/fs/aufs/loop.h | |
eca801bf | 39417 | @@ -26,6 +26,8 @@ void au_warn_loopback(struct super_block *h_sb); |
5527c038 JR |
39418 | |
39419 | int au_loopback_init(void); | |
39420 | void au_loopback_fin(void); | |
39421 | + | |
39422 | +struct file *aufs_real_loop(struct file *file); | |
39423 | #else | |
83b672a5 | 39424 | AuStub(struct file *, loop_backing_file, return NULL, struct super_block *sb) |
eca801bf AM |
39425 | |
39426 | @@ -36,6 +38,8 @@ AuStubVoid(au_warn_loopback, struct super_block *h_sb) | |
5527c038 JR |
39427 | |
39428 | AuStubInt0(au_loopback_init, void) | |
39429 | AuStubVoid(au_loopback_fin, void) | |
39430 | + | |
39431 | +AuStub(struct file *, aufs_real_loop, return NULL, struct file *file) | |
39432 | #endif /* BLK_DEV_LOOP */ | |
39433 | ||
39434 | #endif /* __KERNEL__ */ | |
39435 | diff --git a/fs/aufs/super.c b/fs/aufs/super.c | |
016522bc | 39436 | index 589dd0122020..801e0a7faec5 100644 |
5527c038 JR |
39437 | --- a/fs/aufs/super.c |
39438 | +++ b/fs/aufs/super.c | |
fbc438ed | 39439 | @@ -844,7 +844,10 @@ static const struct super_operations aufs_sop = { |
5527c038 JR |
39440 | .statfs = aufs_statfs, |
39441 | .put_super = aufs_put_super, | |
39442 | .sync_fs = aufs_sync_fs, | |
39443 | - .remount_fs = aufs_remount_fs | |
39444 | + .remount_fs = aufs_remount_fs, | |
39445 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
39446 | + .real_loop = aufs_real_loop | |
39447 | +#endif | |
39448 | }; | |
39449 | ||
39450 | /* ---------------------------------------------------------------------- */ | |
39451 | diff --git a/include/linux/fs.h b/include/linux/fs.h | |
43982f53 | 39452 | index 381a13995011..215b76e0f9dc 100644 |
5527c038 JR |
39453 | --- a/include/linux/fs.h |
39454 | +++ b/include/linux/fs.h | |
43982f53 | 39455 | @@ -1973,6 +1973,10 @@ struct super_operations { |
5527c038 JR |
39456 | struct shrink_control *); |
39457 | long (*free_cached_objects)(struct super_block *, | |
39458 | struct shrink_control *); | |
43982f53 | 39459 | +#if IS_ENABLED(CONFIG_BLK_DEV_LOOP) || IS_ENABLED(CONFIG_BLK_DEV_LOOP_MODULE) |
5527c038 JR |
39460 | + /* and aufs */ |
39461 | + struct file *(*real_loop)(struct file *); | |
39462 | +#endif | |
39463 | }; | |
39464 | ||
39465 | /* |