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Commit | Line | Data |
---|---|---|
2121bcd9 | 1 | SPDX-License-Identifier: GPL-2.0 |
cd7a4cd9 | 2 | aufs4.x-rcN kbuild patch |
7f207e10 AM |
3 | |
4 | diff --git a/fs/Kconfig b/fs/Kconfig | |
cd7a4cd9 | 5 | index ac474a6..284cee9 100644 |
7f207e10 AM |
6 | --- a/fs/Kconfig |
7 | +++ b/fs/Kconfig | |
cd7a4cd9 | 8 | @@ -255,6 +255,7 @@ source "fs/pstore/Kconfig" |
5527c038 | 9 | source "fs/sysv/Kconfig" |
7e9cd9fe | 10 | source "fs/ufs/Kconfig" |
7f207e10 AM |
11 | source "fs/exofs/Kconfig" |
12 | +source "fs/aufs/Kconfig" | |
13 | ||
14 | endif # MISC_FILESYSTEMS | |
15 | ||
16 | diff --git a/fs/Makefile b/fs/Makefile | |
cd7a4cd9 | 17 | index 293733f..12d19d0 100644 |
7f207e10 AM |
18 | --- a/fs/Makefile |
19 | +++ b/fs/Makefile | |
be118d29 | 20 | @@ -128,3 +128,4 @@ obj-y += exofs/ # Multiple modules |
7f207e10 | 21 | obj-$(CONFIG_CEPH_FS) += ceph/ |
bf0370f2 | 22 | obj-$(CONFIG_PSTORE) += pstore/ |
c06a8ce3 | 23 | obj-$(CONFIG_EFIVAR_FS) += efivarfs/ |
86dc4139 | 24 | +obj-$(CONFIG_AUFS_FS) += aufs/ |
2121bcd9 | 25 | SPDX-License-Identifier: GPL-2.0 |
cd7a4cd9 | 26 | aufs4.x-rcN base patch |
7f207e10 | 27 | |
c1595e42 | 28 | diff --git a/MAINTAINERS b/MAINTAINERS |
cd7a4cd9 | 29 | index 0fe4228..52cedab 100644 |
c1595e42 JR |
30 | --- a/MAINTAINERS |
31 | +++ b/MAINTAINERS | |
cd7a4cd9 | 32 | @@ -2541,6 +2541,19 @@ 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> | |
38 | +L: linux-unionfs@vger.kernel.org | |
39 | +L: aufs-users@lists.sourceforge.net (members only) | |
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 |
cd7a4cd9 | 53 | index 4cb1d1b..5678bf8 100644 |
392086de AM |
54 | --- a/drivers/block/loop.c |
55 | +++ b/drivers/block/loop.c | |
cd7a4cd9 AM |
56 | @@ -741,6 +741,24 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
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 |
cd7a4cd9 | 82 | index 0e8e5de..88de3b6 100644 |
c1595e42 JR |
83 | --- a/fs/dcache.c |
84 | +++ b/fs/dcache.c | |
cd7a4cd9 | 85 | @@ -1240,7 +1240,7 @@ 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 |
cd7a4cd9 | 95 | index 12273b6..545e686 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) | |
103 | +int setfl(int fd, struct file * filp, unsigned long arg) | |
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 |
cd7a4cd9 | 117 | index 8c86c80..af894e7 100644 |
5afbbe0d AM |
118 | --- a/fs/inode.c |
119 | +++ b/fs/inode.c | |
cd7a4cd9 | 120 | @@ -1649,7 +1649,7 @@ 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 |
cd7a4cd9 | 130 | index 8ddd148..ee649e0 100644 |
8b6a4947 AM |
131 | --- a/fs/namespace.c |
132 | +++ b/fs/namespace.c | |
133 | @@ -846,6 +846,12 @@ static inline int check_mnt(struct mount *mnt) | |
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 |
cd7a4cd9 | 147 | index 153f8f6..ccc5bc8 100644 |
5527c038 JR |
148 | --- a/fs/read_write.c |
149 | +++ b/fs/read_write.c | |
b00004a5 | 150 | @@ -489,6 +489,28 @@ ssize_t __vfs_write(struct file *file, const char __user *p, size_t count, |
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; | |
162 | + return ERR_PTR(-ENOSYS); | |
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; | |
173 | + return ERR_PTR(-ENOSYS); | |
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 |
cd7a4cd9 | 180 | index b3daa97..1dd7f96 100644 |
7f207e10 AM |
181 | --- a/fs/splice.c |
182 | +++ b/fs/splice.c | |
cd7a4cd9 | 183 | @@ -838,8 +838,8 @@ 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); | |
cd7a4cd9 | 194 | @@ -855,9 +855,9 @@ 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 |
b00004a5 | 208 | index b54e054..2860782 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); | |
b912730e | 220 | diff --git a/include/linux/file.h b/include/linux/file.h |
2121bcd9 | 221 | index 279720d..76e38ea 100644 |
b912730e AM |
222 | --- a/include/linux/file.h |
223 | +++ b/include/linux/file.h | |
2121bcd9 | 224 | @@ -20,6 +20,7 @@ struct dentry; |
b912730e | 225 | struct path; |
a2654f78 | 226 | extern struct file *alloc_file(const struct path *, fmode_t mode, |
b912730e AM |
227 | const struct file_operations *fop); |
228 | +extern struct file *get_empty_filp(void); | |
229 | ||
230 | static inline void fput_light(struct file *file, int fput_needed) | |
231 | { | |
5527c038 | 232 | diff --git a/include/linux/fs.h b/include/linux/fs.h |
cd7a4cd9 | 233 | index 805bf22..0d0d247f 100644 |
5527c038 JR |
234 | --- a/include/linux/fs.h |
235 | +++ b/include/linux/fs.h | |
cd7a4cd9 | 236 | @@ -1273,6 +1273,7 @@ extern void fasync_free(struct fasync_struct *); |
febd17d6 JR |
237 | /* can be called from interrupts */ |
238 | extern void kill_fasync(struct fasync_struct **, int, int); | |
239 | ||
240 | +extern int setfl(int fd, struct file * filp, unsigned long arg); | |
241 | extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force); | |
3c1bdaff | 242 | extern int f_setown(struct file *filp, unsigned long arg, int force); |
febd17d6 | 243 | extern void f_delown(struct file *filp); |
cd7a4cd9 | 244 | @@ -1733,6 +1734,7 @@ struct file_operations { |
febd17d6 JR |
245 | ssize_t (*sendpage) (struct file *, struct page *, int, size_t, loff_t *, int); |
246 | unsigned long (*get_unmapped_area)(struct file *, unsigned long, unsigned long, unsigned long, unsigned long); | |
247 | int (*check_flags)(int); | |
248 | + int (*setfl)(struct file *, unsigned long); | |
249 | int (*flock) (struct file *, int, struct file_lock *); | |
250 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int); | |
251 | ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int); | |
cd7a4cd9 | 252 | @@ -1803,6 +1805,12 @@ ssize_t rw_copy_check_uvector(int type, const struct iovec __user * uvector, |
5527c038 JR |
253 | struct iovec *fast_pointer, |
254 | struct iovec **ret_pointer); | |
255 | ||
256 | +typedef ssize_t (*vfs_readf_t)(struct file *, char __user *, size_t, loff_t *); | |
257 | +typedef ssize_t (*vfs_writef_t)(struct file *, const char __user *, size_t, | |
258 | + loff_t *); | |
259 | +vfs_readf_t vfs_readf(struct file *file); | |
260 | +vfs_writef_t vfs_writef(struct file *file); | |
261 | + | |
262 | extern ssize_t __vfs_read(struct file *, char __user *, size_t, loff_t *); | |
5527c038 | 263 | extern ssize_t vfs_read(struct file *, char __user *, size_t, loff_t *); |
8b6a4947 | 264 | extern ssize_t vfs_write(struct file *, const char __user *, size_t, loff_t *); |
cd7a4cd9 | 265 | @@ -2218,6 +2226,7 @@ extern int current_umask(void); |
5afbbe0d AM |
266 | extern void ihold(struct inode * inode); |
267 | extern void iput(struct inode *); | |
cd7a4cd9 AM |
268 | extern int generic_update_time(struct inode *, struct timespec64 *, int); |
269 | +extern int update_time(struct inode *, struct timespec64 *, int); | |
5afbbe0d AM |
270 | |
271 | /* /sys/fs */ | |
272 | extern struct kobject *fs_kobj; | |
cd7a4cd9 | 273 | @@ -2505,6 +2514,7 @@ static inline bool sb_is_blkdev_sb(struct super_block *sb) |
a2654f78 AM |
274 | return false; |
275 | } | |
276 | #endif | |
277 | +extern int __sync_filesystem(struct super_block *, int); | |
278 | extern int sync_filesystem(struct super_block *); | |
279 | extern const struct file_operations def_blk_fops; | |
280 | extern const struct file_operations def_chr_fops; | |
8b6a4947 | 281 | diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h |
be118d29 | 282 | index 6fc77d4..27e76f0 100644 |
8b6a4947 AM |
283 | --- a/include/linux/lockdep.h |
284 | +++ b/include/linux/lockdep.h | |
be118d29 | 285 | @@ -313,6 +313,8 @@ static inline int lockdep_match_key(struct lockdep_map *lock, |
8b6a4947 AM |
286 | return lock->key == key; |
287 | } | |
288 | ||
289 | +struct lock_class *lockdep_hlock_class(struct held_lock *hlock); | |
290 | + | |
291 | /* | |
292 | * Acquire a lock. | |
293 | * | |
be118d29 | 294 | @@ -439,6 +441,7 @@ struct lockdep_map { }; |
8b6a4947 AM |
295 | |
296 | #define lockdep_depth(tsk) (0) | |
297 | ||
298 | +#define lockdep_is_held(lock) (1) | |
299 | #define lockdep_is_held_type(l, r) (1) | |
300 | ||
301 | #define lockdep_assert_held(l) do { (void)(l); } while (0) | |
302 | diff --git a/include/linux/mnt_namespace.h b/include/linux/mnt_namespace.h | |
2121bcd9 | 303 | index 3594208..24f5fd1 100644 |
8b6a4947 AM |
304 | --- a/include/linux/mnt_namespace.h |
305 | +++ b/include/linux/mnt_namespace.h | |
2121bcd9 | 306 | @@ -6,11 +6,14 @@ |
8b6a4947 AM |
307 | struct mnt_namespace; |
308 | struct fs_struct; | |
309 | struct user_namespace; | |
310 | +struct vfsmount; | |
311 | ||
312 | extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *, | |
313 | struct user_namespace *, struct fs_struct *); | |
314 | extern void put_mnt_ns(struct mnt_namespace *ns); | |
315 | ||
316 | +extern int is_current_mnt_ns(struct vfsmount *mnt); | |
317 | + | |
318 | extern const struct file_operations proc_mounts_operations; | |
319 | extern const struct file_operations proc_mountinfo_operations; | |
320 | extern const struct file_operations proc_mountstats_operations; | |
1e00d052 | 321 | diff --git a/include/linux/splice.h b/include/linux/splice.h |
2121bcd9 | 322 | index 74b4911..19789fb 100644 |
1e00d052 AM |
323 | --- a/include/linux/splice.h |
324 | +++ b/include/linux/splice.h | |
2121bcd9 | 325 | @@ -87,4 +87,10 @@ extern void splice_shrink_spd(struct splice_pipe_desc *); |
4b3da204 AM |
326 | |
327 | extern const struct pipe_buf_operations page_cache_pipe_buf_ops; | |
106341ce | 328 | extern const struct pipe_buf_operations default_pipe_buf_ops; |
1e00d052 AM |
329 | + |
330 | +extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
331 | + loff_t *ppos, size_t len, unsigned int flags); | |
332 | +extern long do_splice_to(struct file *in, loff_t *ppos, | |
333 | + struct pipe_inode_info *pipe, size_t len, | |
334 | + unsigned int flags); | |
335 | #endif | |
8b6a4947 | 336 | diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c |
cd7a4cd9 | 337 | index 5fa4d31..720f070 100644 |
8b6a4947 AM |
338 | --- a/kernel/locking/lockdep.c |
339 | +++ b/kernel/locking/lockdep.c | |
be118d29 | 340 | @@ -140,7 +140,7 @@ static struct lock_list list_entries[MAX_LOCKDEP_ENTRIES]; |
8b6a4947 AM |
341 | unsigned long nr_lock_classes; |
342 | static struct lock_class lock_classes[MAX_LOCKDEP_KEYS]; | |
343 | ||
344 | -static inline struct lock_class *hlock_class(struct held_lock *hlock) | |
345 | +inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) | |
346 | { | |
347 | if (!hlock->class_idx) { | |
348 | /* | |
be118d29 | 349 | @@ -151,6 +151,7 @@ static inline struct lock_class *hlock_class(struct held_lock *hlock) |
8b6a4947 AM |
350 | } |
351 | return lock_classes + hlock->class_idx - 1; | |
352 | } | |
353 | +#define hlock_class(hlock) lockdep_hlock_class(hlock) | |
354 | ||
355 | #ifdef CONFIG_LOCK_STAT | |
356 | static DEFINE_PER_CPU(struct lock_class_stats[MAX_LOCKDEP_KEYS], cpu_lock_stats); | |
2121bcd9 | 357 | SPDX-License-Identifier: GPL-2.0 |
cd7a4cd9 | 358 | aufs4.x-rcN mmap patch |
fb47a38f | 359 | |
c1595e42 | 360 | diff --git a/fs/proc/base.c b/fs/proc/base.c |
cd7a4cd9 | 361 | index aaffc0c..ab72941 100644 |
c1595e42 JR |
362 | --- a/fs/proc/base.c |
363 | +++ b/fs/proc/base.c | |
cd7a4cd9 | 364 | @@ -2004,7 +2004,7 @@ static int map_files_get_link(struct dentry *dentry, struct path *path) |
c1595e42 JR |
365 | down_read(&mm->mmap_sem); |
366 | vma = find_exact_vma(mm, vm_start, vm_end); | |
367 | if (vma && vma->vm_file) { | |
368 | - *path = vma->vm_file->f_path; | |
369 | + *path = vma_pr_or_file(vma)->f_path; | |
370 | path_get(path); | |
371 | rc = 0; | |
372 | } | |
fb47a38f | 373 | diff --git a/fs/proc/nommu.c b/fs/proc/nommu.c |
cd7a4cd9 | 374 | index 3b63be6..fb9913b 100644 |
fb47a38f JR |
375 | --- a/fs/proc/nommu.c |
376 | +++ b/fs/proc/nommu.c | |
076b876e | 377 | @@ -45,7 +45,10 @@ static int nommu_region_show(struct seq_file *m, struct vm_region *region) |
fb47a38f JR |
378 | file = region->vm_file; |
379 | ||
380 | if (file) { | |
381 | - struct inode *inode = file_inode(region->vm_file); | |
382 | + struct inode *inode; | |
076b876e | 383 | + |
fb47a38f JR |
384 | + file = vmr_pr_or_file(region); |
385 | + inode = file_inode(file); | |
386 | dev = inode->i_sb->s_dev; | |
387 | ino = inode->i_ino; | |
388 | } | |
389 | diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c | |
cd7a4cd9 | 390 | index dfd73a4..ed2ce10 100644 |
fb47a38f JR |
391 | --- a/fs/proc/task_mmu.c |
392 | +++ b/fs/proc/task_mmu.c | |
cd7a4cd9 | 393 | @@ -306,7 +306,10 @@ show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) |
fb47a38f JR |
394 | const char *name = NULL; |
395 | ||
396 | if (file) { | |
397 | - struct inode *inode = file_inode(vma->vm_file); | |
398 | + struct inode *inode; | |
076b876e | 399 | + |
fb47a38f JR |
400 | + file = vma_pr_or_file(vma); |
401 | + inode = file_inode(file); | |
402 | dev = inode->i_sb->s_dev; | |
403 | ino = inode->i_ino; | |
404 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; | |
cd7a4cd9 | 405 | @@ -1734,7 +1737,7 @@ static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
076b876e AM |
406 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; |
407 | struct vm_area_struct *vma = v; | |
408 | struct numa_maps *md = &numa_priv->md; | |
409 | - struct file *file = vma->vm_file; | |
410 | + struct file *file = vma_pr_or_file(vma); | |
076b876e | 411 | struct mm_struct *mm = vma->vm_mm; |
7e9cd9fe AM |
412 | struct mm_walk walk = { |
413 | .hugetlb_entry = gather_hugetlb_stats, | |
fb47a38f | 414 | diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c |
2121bcd9 | 415 | index 5b62f57..dfb4a3b 100644 |
fb47a38f JR |
416 | --- a/fs/proc/task_nommu.c |
417 | +++ b/fs/proc/task_nommu.c | |
2121bcd9 | 418 | @@ -156,7 +156,10 @@ static int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma, |
fb47a38f JR |
419 | file = vma->vm_file; |
420 | ||
421 | if (file) { | |
422 | - struct inode *inode = file_inode(vma->vm_file); | |
423 | + struct inode *inode; | |
076b876e | 424 | + |
b912730e | 425 | + file = vma_pr_or_file(vma); |
fb47a38f JR |
426 | + inode = file_inode(file); |
427 | dev = inode->i_sb->s_dev; | |
428 | ino = inode->i_ino; | |
429 | pgoff = (loff_t)vma->vm_pgoff << PAGE_SHIFT; | |
430 | diff --git a/include/linux/mm.h b/include/linux/mm.h | |
cd7a4cd9 | 431 | index d3a3842..c4664f2 100644 |
fb47a38f JR |
432 | --- a/include/linux/mm.h |
433 | +++ b/include/linux/mm.h | |
cd7a4cd9 | 434 | @@ -1431,6 +1431,28 @@ static inline void unmap_shared_mapping_range(struct address_space *mapping, |
a3232e84 | 435 | unmap_mapping_range(mapping, holebegin, holelen, 0); |
fb47a38f | 436 | } |
fb47a38f | 437 | |
076b876e AM |
438 | +extern void vma_do_file_update_time(struct vm_area_struct *, const char[], int); |
439 | +extern struct file *vma_do_pr_or_file(struct vm_area_struct *, const char[], | |
f2c43d5f | 440 | + int); |
076b876e AM |
441 | +extern void vma_do_get_file(struct vm_area_struct *, const char[], int); |
442 | +extern void vma_do_fput(struct vm_area_struct *, const char[], int); | |
fb47a38f | 443 | + |
f2c43d5f AM |
444 | +#define vma_file_update_time(vma) vma_do_file_update_time(vma, __func__, \ |
445 | + __LINE__) | |
446 | +#define vma_pr_or_file(vma) vma_do_pr_or_file(vma, __func__, \ | |
447 | + __LINE__) | |
448 | +#define vma_get_file(vma) vma_do_get_file(vma, __func__, __LINE__) | |
449 | +#define vma_fput(vma) vma_do_fput(vma, __func__, __LINE__) | |
b912730e AM |
450 | + |
451 | +#ifndef CONFIG_MMU | |
076b876e AM |
452 | +extern struct file *vmr_do_pr_or_file(struct vm_region *, const char[], int); |
453 | +extern void vmr_do_fput(struct vm_region *, const char[], int); | |
454 | + | |
f2c43d5f AM |
455 | +#define vmr_pr_or_file(region) vmr_do_pr_or_file(region, __func__, \ |
456 | + __LINE__) | |
457 | +#define vmr_fput(region) vmr_do_fput(region, __func__, __LINE__) | |
b912730e | 458 | +#endif /* !CONFIG_MMU */ |
fb47a38f | 459 | + |
a3232e84 JR |
460 | extern int access_process_vm(struct task_struct *tsk, unsigned long addr, |
461 | void *buf, int len, unsigned int gup_flags); | |
fb47a38f | 462 | extern int access_remote_vm(struct mm_struct *mm, unsigned long addr, |
fb47a38f | 463 | diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h |
cd7a4cd9 | 464 | index 99ce070..8babe35 100644 |
fb47a38f JR |
465 | --- a/include/linux/mm_types.h |
466 | +++ b/include/linux/mm_types.h | |
cd7a4cd9 | 467 | @@ -236,6 +236,7 @@ struct vm_region { |
fb47a38f JR |
468 | unsigned long vm_top; /* region allocated to here */ |
469 | unsigned long vm_pgoff; /* the offset in vm_file corresponding to vm_start */ | |
470 | struct file *vm_file; /* the backing file or NULL */ | |
471 | + struct file *vm_prfile; /* the virtual backing file or NULL */ | |
472 | ||
473 | int vm_usage; /* region usage count (access under nommu_region_sem) */ | |
474 | bool vm_icache_flushed : 1; /* true if the icache has been flushed for | |
cd7a4cd9 | 475 | @@ -310,6 +311,7 @@ struct vm_area_struct { |
fb47a38f | 476 | unsigned long vm_pgoff; /* Offset (within vm_file) in PAGE_SIZE |
5afbbe0d | 477 | units */ |
fb47a38f JR |
478 | struct file * vm_file; /* File we map to (can be NULL). */ |
479 | + struct file *vm_prfile; /* shadow of vm_file */ | |
480 | void * vm_private_data; /* was vm_pte (shared mem) */ | |
481 | ||
8b6a4947 | 482 | atomic_long_t swap_readahead_info; |
fb47a38f | 483 | diff --git a/kernel/fork.c b/kernel/fork.c |
cd7a4cd9 | 484 | index a191c05..d88ee5a 100644 |
fb47a38f JR |
485 | --- a/kernel/fork.c |
486 | +++ b/kernel/fork.c | |
cd7a4cd9 | 487 | @@ -506,7 +506,7 @@ static __latent_entropy int dup_mmap(struct mm_struct *mm, |
fb47a38f JR |
488 | struct inode *inode = file_inode(file); |
489 | struct address_space *mapping = file->f_mapping; | |
490 | ||
491 | - get_file(file); | |
492 | + vma_get_file(tmp); | |
493 | if (tmp->vm_flags & VM_DENYWRITE) | |
494 | atomic_dec(&inode->i_writecount); | |
2000de60 | 495 | i_mmap_lock_write(mapping); |
076b876e | 496 | diff --git a/mm/Makefile b/mm/Makefile |
cd7a4cd9 | 497 | index 8716bda..68afd6d 100644 |
076b876e AM |
498 | --- a/mm/Makefile |
499 | +++ b/mm/Makefile | |
521ced18 | 500 | @@ -39,7 +39,7 @@ obj-y := filemap.o mempool.o oom_kill.o \ |
076b876e | 501 | mm_init.o mmu_context.o percpu.o slab_common.o \ |
b00004a5 | 502 | compaction.o vmacache.o \ |
076b876e | 503 | interval_tree.o list_lru.o workingset.o \ |
7e9cd9fe AM |
504 | - debug.o $(mmu-y) |
505 | + prfile.o debug.o $(mmu-y) | |
076b876e AM |
506 | |
507 | obj-y += init-mm.o | |
508 | ||
fb47a38f | 509 | diff --git a/mm/filemap.c b/mm/filemap.c |
cd7a4cd9 | 510 | index 52517f2..250f675 100644 |
fb47a38f JR |
511 | --- a/mm/filemap.c |
512 | +++ b/mm/filemap.c | |
cd7a4cd9 AM |
513 | @@ -2700,7 +2700,7 @@ vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf) |
514 | vm_fault_t ret = VM_FAULT_LOCKED; | |
fb47a38f JR |
515 | |
516 | sb_start_pagefault(inode->i_sb); | |
521ced18 JR |
517 | - file_update_time(vmf->vma->vm_file); |
518 | + vma_file_update_time(vmf->vma); | |
fb47a38f JR |
519 | lock_page(page); |
520 | if (page->mapping != inode->i_mapping) { | |
521 | unlock_page(page); | |
fb47a38f | 522 | diff --git a/mm/mmap.c b/mm/mmap.c |
cd7a4cd9 | 523 | index ff1944d..88abe2d 100644 |
fb47a38f JR |
524 | --- a/mm/mmap.c |
525 | +++ b/mm/mmap.c | |
c4adf169 | 526 | @@ -180,7 +180,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma) |
fb47a38f JR |
527 | if (vma->vm_ops && vma->vm_ops->close) |
528 | vma->vm_ops->close(vma); | |
529 | if (vma->vm_file) | |
530 | - fput(vma->vm_file); | |
531 | + vma_fput(vma); | |
532 | mpol_put(vma_policy(vma)); | |
cd7a4cd9 | 533 | vm_area_free(vma); |
fb47a38f | 534 | return next; |
c4adf169 | 535 | @@ -905,7 +905,7 @@ int __vma_adjust(struct vm_area_struct *vma, unsigned long start, |
fb47a38f JR |
536 | if (remove_next) { |
537 | if (file) { | |
538 | uprobe_munmap(next, next->vm_start, next->vm_end); | |
539 | - fput(file); | |
540 | + vma_fput(vma); | |
541 | } | |
542 | if (next->anon_vma) | |
543 | anon_vma_merge(vma, next); | |
cd7a4cd9 | 544 | @@ -1818,8 +1818,8 @@ unsigned long mmap_region(struct file *file, unsigned long addr, |
35939ee7 JR |
545 | return addr; |
546 | ||
fb47a38f | 547 | unmap_and_free_vma: |
fb47a38f JR |
548 | + vma_fput(vma); |
549 | vma->vm_file = NULL; | |
550 | - fput(file); | |
551 | ||
552 | /* Undo any partial mapping done by a device driver. */ | |
553 | unmap_region(mm, vma, prev, vma->vm_start, vma->vm_end); | |
cd7a4cd9 | 554 | @@ -2638,7 +2638,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, |
fb47a38f JR |
555 | goto out_free_mpol; |
556 | ||
557 | if (new->vm_file) | |
558 | - get_file(new->vm_file); | |
559 | + vma_get_file(new); | |
560 | ||
561 | if (new->vm_ops && new->vm_ops->open) | |
562 | new->vm_ops->open(new); | |
cd7a4cd9 | 563 | @@ -2657,7 +2657,7 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, |
fb47a38f JR |
564 | if (new->vm_ops && new->vm_ops->close) |
565 | new->vm_ops->close(new); | |
566 | if (new->vm_file) | |
567 | - fput(new->vm_file); | |
568 | + vma_fput(new); | |
569 | unlink_anon_vmas(new); | |
570 | out_free_mpol: | |
571 | mpol_put(vma_policy(new)); | |
cd7a4cd9 | 572 | @@ -2819,7 +2819,7 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, |
7e9cd9fe AM |
573 | struct vm_area_struct *vma; |
574 | unsigned long populate = 0; | |
575 | unsigned long ret = -EINVAL; | |
576 | - struct file *file; | |
5afbbe0d | 577 | + struct file *file, *prfile; |
7e9cd9fe | 578 | |
cd7a4cd9 | 579 | pr_warn_once("%s (%d) uses deprecated remap_file_pages() syscall. See Documentation/vm/remap_file_pages.rst.\n", |
5afbbe0d | 580 | current->comm, current->pid); |
cd7a4cd9 | 581 | @@ -2894,10 +2894,27 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size, |
febd17d6 | 582 | } |
7e9cd9fe AM |
583 | } |
584 | ||
585 | - file = get_file(vma->vm_file); | |
586 | + vma_get_file(vma); | |
5afbbe0d AM |
587 | + file = vma->vm_file; |
588 | + prfile = vma->vm_prfile; | |
7e9cd9fe | 589 | ret = do_mmap_pgoff(vma->vm_file, start, size, |
521ced18 | 590 | prot, flags, pgoff, &populate, NULL); |
5afbbe0d AM |
591 | + if (!IS_ERR_VALUE(ret) && file && prfile) { |
592 | + struct vm_area_struct *new_vma; | |
593 | + | |
594 | + new_vma = find_vma(mm, ret); | |
595 | + if (!new_vma->vm_prfile) | |
596 | + new_vma->vm_prfile = prfile; | |
597 | + if (new_vma != vma) | |
598 | + get_file(prfile); | |
599 | + } | |
600 | + /* | |
601 | + * two fput()s instead of vma_fput(vma), | |
602 | + * coz vma may not be available anymore. | |
603 | + */ | |
604 | fput(file); | |
605 | + if (prfile) | |
606 | + fput(prfile); | |
7e9cd9fe AM |
607 | out: |
608 | up_write(&mm->mmap_sem); | |
609 | if (populate) | |
cd7a4cd9 | 610 | @@ -3204,7 +3221,7 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, |
79b8bda9 AM |
611 | if (anon_vma_clone(new_vma, vma)) |
612 | goto out_free_mempol; | |
613 | if (new_vma->vm_file) | |
614 | - get_file(new_vma->vm_file); | |
615 | + vma_get_file(new_vma); | |
616 | if (new_vma->vm_ops && new_vma->vm_ops->open) | |
617 | new_vma->vm_ops->open(new_vma); | |
618 | vma_link(mm, new_vma, prev, rb_link, rb_parent); | |
fb47a38f | 619 | diff --git a/mm/nommu.c b/mm/nommu.c |
cd7a4cd9 | 620 | index 1d22fdb..2b608be 100644 |
fb47a38f JR |
621 | --- a/mm/nommu.c |
622 | +++ b/mm/nommu.c | |
b00004a5 | 623 | @@ -629,7 +629,7 @@ static void __put_nommu_region(struct vm_region *region) |
fb47a38f JR |
624 | up_write(&nommu_region_sem); |
625 | ||
626 | if (region->vm_file) | |
627 | - fput(region->vm_file); | |
628 | + vmr_fput(region); | |
629 | ||
630 | /* IO memory and memory shared directly out of the pagecache | |
631 | * from ramfs/tmpfs mustn't be released here */ | |
b00004a5 | 632 | @@ -767,7 +767,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma) |
fb47a38f JR |
633 | if (vma->vm_ops && vma->vm_ops->close) |
634 | vma->vm_ops->close(vma); | |
635 | if (vma->vm_file) | |
636 | - fput(vma->vm_file); | |
637 | + vma_fput(vma); | |
638 | put_nommu_region(vma->vm_region); | |
cd7a4cd9 | 639 | vm_area_free(vma); |
fb47a38f | 640 | } |
cd7a4cd9 | 641 | @@ -1288,7 +1288,7 @@ unsigned long do_mmap(struct file *file, |
fb47a38f JR |
642 | goto error_just_free; |
643 | } | |
644 | } | |
645 | - fput(region->vm_file); | |
646 | + vmr_fput(region); | |
647 | kmem_cache_free(vm_region_jar, region); | |
648 | region = pregion; | |
649 | result = start; | |
cd7a4cd9 | 650 | @@ -1363,7 +1363,7 @@ unsigned long do_mmap(struct file *file, |
fb47a38f JR |
651 | up_write(&nommu_region_sem); |
652 | error: | |
653 | if (region->vm_file) | |
654 | - fput(region->vm_file); | |
655 | + vmr_fput(region); | |
656 | kmem_cache_free(vm_region_jar, region); | |
657 | if (vma->vm_file) | |
cd7a4cd9 | 658 | fput(vma->vm_file); |
076b876e AM |
659 | diff --git a/mm/prfile.c b/mm/prfile.c |
660 | new file mode 100644 | |
cd7a4cd9 | 661 | index 0000000..a27ac36 |
076b876e AM |
662 | --- /dev/null |
663 | +++ b/mm/prfile.c | |
2121bcd9 | 664 | @@ -0,0 +1,86 @@ |
cd7a4cd9 | 665 | +// SPDX-License-Identifier: GPL-2.0 |
076b876e | 666 | +/* |
1c60b727 AM |
667 | + * Mainly for aufs which mmap(2) different file and wants to print different |
668 | + * path in /proc/PID/maps. | |
076b876e AM |
669 | + * Call these functions via macros defined in linux/mm.h. |
670 | + * | |
671 | + * See Documentation/filesystems/aufs/design/06mmap.txt | |
672 | + * | |
b00004a5 | 673 | + * Copyright (c) 2014-2018 Junjro R. Okajima |
076b876e AM |
674 | + * Copyright (c) 2014 Ian Campbell |
675 | + */ | |
676 | + | |
677 | +#include <linux/mm.h> | |
678 | +#include <linux/file.h> | |
679 | +#include <linux/fs.h> | |
680 | + | |
681 | +/* #define PRFILE_TRACE */ | |
682 | +static inline void prfile_trace(struct file *f, struct file *pr, | |
683 | + const char func[], int line, const char func2[]) | |
684 | +{ | |
685 | +#ifdef PRFILE_TRACE | |
686 | + if (pr) | |
1c60b727 | 687 | + pr_info("%s:%d: %s, %pD2\n", func, line, func2, f); |
076b876e AM |
688 | +#endif |
689 | +} | |
690 | + | |
076b876e AM |
691 | +void vma_do_file_update_time(struct vm_area_struct *vma, const char func[], |
692 | + int line) | |
693 | +{ | |
694 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
695 | + | |
696 | + prfile_trace(f, pr, func, line, __func__); | |
697 | + file_update_time(f); | |
698 | + if (f && pr) | |
699 | + file_update_time(pr); | |
700 | +} | |
701 | + | |
702 | +struct file *vma_do_pr_or_file(struct vm_area_struct *vma, const char func[], | |
703 | + int line) | |
704 | +{ | |
705 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
706 | + | |
707 | + prfile_trace(f, pr, func, line, __func__); | |
708 | + return (f && pr) ? pr : f; | |
709 | +} | |
710 | + | |
711 | +void vma_do_get_file(struct vm_area_struct *vma, const char func[], int line) | |
712 | +{ | |
713 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
714 | + | |
715 | + prfile_trace(f, pr, func, line, __func__); | |
716 | + get_file(f); | |
717 | + if (f && pr) | |
718 | + get_file(pr); | |
719 | +} | |
720 | + | |
721 | +void vma_do_fput(struct vm_area_struct *vma, const char func[], int line) | |
722 | +{ | |
723 | + struct file *f = vma->vm_file, *pr = vma->vm_prfile; | |
724 | + | |
725 | + prfile_trace(f, pr, func, line, __func__); | |
726 | + fput(f); | |
727 | + if (f && pr) | |
728 | + fput(pr); | |
729 | +} | |
b912730e AM |
730 | + |
731 | +#ifndef CONFIG_MMU | |
076b876e AM |
732 | +struct file *vmr_do_pr_or_file(struct vm_region *region, const char func[], |
733 | + int line) | |
734 | +{ | |
735 | + struct file *f = region->vm_file, *pr = region->vm_prfile; | |
736 | + | |
737 | + prfile_trace(f, pr, func, line, __func__); | |
738 | + return (f && pr) ? pr : f; | |
739 | +} | |
740 | + | |
741 | +void vmr_do_fput(struct vm_region *region, const char func[], int line) | |
742 | +{ | |
743 | + struct file *f = region->vm_file, *pr = region->vm_prfile; | |
744 | + | |
745 | + prfile_trace(f, pr, func, line, __func__); | |
746 | + fput(f); | |
747 | + if (f && pr) | |
748 | + fput(pr); | |
749 | +} | |
b912730e | 750 | +#endif /* !CONFIG_MMU */ |
2121bcd9 | 751 | SPDX-License-Identifier: GPL-2.0 |
cd7a4cd9 | 752 | aufs4.x-rcN standalone patch |
7f207e10 | 753 | |
c1595e42 | 754 | diff --git a/fs/dcache.c b/fs/dcache.c |
cd7a4cd9 | 755 | index 88de3b6..de0091a 100644 |
c1595e42 JR |
756 | --- a/fs/dcache.c |
757 | +++ b/fs/dcache.c | |
cd7a4cd9 | 758 | @@ -1345,6 +1345,7 @@ void d_walk(struct dentry *parent, void *data, |
c1595e42 JR |
759 | seq = 1; |
760 | goto again; | |
761 | } | |
febd17d6 | 762 | +EXPORT_SYMBOL_GPL(d_walk); |
c1595e42 | 763 | |
a2654f78 AM |
764 | struct check_mount { |
765 | struct vfsmount *mnt; | |
cd7a4cd9 | 766 | @@ -2891,6 +2892,7 @@ void d_exchange(struct dentry *dentry1, struct dentry *dentry2) |
f2c43d5f AM |
767 | |
768 | write_sequnlock(&rename_lock); | |
769 | } | |
770 | +EXPORT_SYMBOL_GPL(d_exchange); | |
771 | ||
772 | /** | |
773 | * d_ancestor - search for an ancestor | |
79b8bda9 | 774 | diff --git a/fs/exec.c b/fs/exec.c |
cd7a4cd9 | 775 | index 72e961a..adc7329 100644 |
79b8bda9 AM |
776 | --- a/fs/exec.c |
777 | +++ b/fs/exec.c | |
521ced18 | 778 | @@ -109,6 +109,7 @@ bool path_noexec(const struct path *path) |
79b8bda9 AM |
779 | return (path->mnt->mnt_flags & MNT_NOEXEC) || |
780 | (path->mnt->mnt_sb->s_iflags & SB_I_NOEXEC); | |
781 | } | |
febd17d6 | 782 | +EXPORT_SYMBOL_GPL(path_noexec); |
79b8bda9 AM |
783 | |
784 | #ifdef CONFIG_USELIB | |
785 | /* | |
febd17d6 | 786 | diff --git a/fs/fcntl.c b/fs/fcntl.c |
cd7a4cd9 | 787 | index 545e686..0237ad7 100644 |
febd17d6 JR |
788 | --- a/fs/fcntl.c |
789 | +++ b/fs/fcntl.c | |
2121bcd9 | 790 | @@ -85,6 +85,7 @@ int setfl(int fd, struct file * filp, unsigned long arg) |
febd17d6 JR |
791 | out: |
792 | return error; | |
793 | } | |
794 | +EXPORT_SYMBOL_GPL(setfl); | |
795 | ||
796 | static void f_modown(struct file *filp, struct pid *pid, enum pid_type type, | |
797 | int force) | |
b912730e | 798 | diff --git a/fs/file_table.c b/fs/file_table.c |
be118d29 | 799 | index 7ec0b3e..819ee07 100644 |
b912730e AM |
800 | --- a/fs/file_table.c |
801 | +++ b/fs/file_table.c | |
be118d29 | 802 | @@ -147,6 +147,7 @@ struct file *get_empty_filp(void) |
b912730e AM |
803 | } |
804 | return ERR_PTR(-ENFILE); | |
805 | } | |
febd17d6 | 806 | +EXPORT_SYMBOL_GPL(get_empty_filp); |
b912730e AM |
807 | |
808 | /** | |
809 | * alloc_file - allocate and initialize a 'struct file' | |
be118d29 | 810 | @@ -257,6 +258,7 @@ void flush_delayed_fput(void) |
8cdd5066 JR |
811 | { |
812 | delayed_fput(NULL); | |
813 | } | |
febd17d6 | 814 | +EXPORT_SYMBOL_GPL(flush_delayed_fput); |
8cdd5066 JR |
815 | |
816 | static DECLARE_DELAYED_WORK(delayed_fput_work, delayed_fput); | |
817 | ||
be118d29 | 818 | @@ -299,6 +301,7 @@ void __fput_sync(struct file *file) |
8cdd5066 JR |
819 | } |
820 | ||
821 | EXPORT_SYMBOL(fput); | |
febd17d6 | 822 | +EXPORT_SYMBOL_GPL(__fput_sync); |
8cdd5066 JR |
823 | |
824 | void put_filp(struct file *file) | |
825 | { | |
be118d29 | 826 | @@ -307,6 +310,7 @@ void put_filp(struct file *file) |
b912730e AM |
827 | file_free(file); |
828 | } | |
829 | } | |
febd17d6 | 830 | +EXPORT_SYMBOL_GPL(put_filp); |
b912730e | 831 | |
79b8bda9 | 832 | void __init files_init(void) |
8b6a4947 | 833 | { |
5afbbe0d | 834 | diff --git a/fs/inode.c b/fs/inode.c |
cd7a4cd9 | 835 | index af894e7..169811b 100644 |
5afbbe0d AM |
836 | --- a/fs/inode.c |
837 | +++ b/fs/inode.c | |
cd7a4cd9 | 838 | @@ -1658,6 +1658,7 @@ int update_time(struct inode *inode, struct timespec64 *time, int flags) |
5afbbe0d AM |
839 | |
840 | return update_time(inode, time, flags); | |
841 | } | |
842 | +EXPORT_SYMBOL_GPL(update_time); | |
843 | ||
844 | /** | |
845 | * touch_atime - update the access time | |
7f207e10 | 846 | diff --git a/fs/namespace.c b/fs/namespace.c |
cd7a4cd9 | 847 | index ee649e0..10923cb 100644 |
7f207e10 AM |
848 | --- a/fs/namespace.c |
849 | +++ b/fs/namespace.c | |
8b6a4947 | 850 | @@ -517,6 +517,7 @@ void __mnt_drop_write(struct vfsmount *mnt) |
c06a8ce3 AM |
851 | mnt_dec_writers(real_mount(mnt)); |
852 | preempt_enable(); | |
853 | } | |
854 | +EXPORT_SYMBOL_GPL(__mnt_drop_write); | |
855 | ||
856 | /** | |
857 | * mnt_drop_write - give up write access to a mount | |
8b6a4947 AM |
858 | @@ -851,6 +852,7 @@ int is_current_mnt_ns(struct vfsmount *mnt) |
859 | { | |
860 | return check_mnt(real_mount(mnt)); | |
861 | } | |
862 | +EXPORT_SYMBOL_GPL(is_current_mnt_ns); | |
863 | ||
864 | /* | |
865 | * vfsmount lock must be held for write | |
b00004a5 | 866 | @@ -1893,6 +1895,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, |
7f207e10 AM |
867 | } |
868 | return 0; | |
869 | } | |
febd17d6 | 870 | +EXPORT_SYMBOL_GPL(iterate_mounts); |
7f207e10 | 871 | |
7eafdf33 | 872 | static void cleanup_group_ids(struct mount *mnt, struct mount *end) |
7f207e10 AM |
873 | { |
874 | diff --git a/fs/notify/group.c b/fs/notify/group.c | |
cd7a4cd9 | 875 | index aa5468f2..b38d224 100644 |
7f207e10 AM |
876 | --- a/fs/notify/group.c |
877 | +++ b/fs/notify/group.c | |
878 | @@ -22,6 +22,7 @@ | |
879 | #include <linux/srcu.h> | |
880 | #include <linux/rculist.h> | |
881 | #include <linux/wait.h> | |
882 | +#include <linux/module.h> | |
883 | ||
884 | #include <linux/fsnotify_backend.h> | |
885 | #include "fsnotify.h" | |
ffa93bbd | 886 | @@ -109,6 +110,7 @@ void fsnotify_get_group(struct fsnotify_group *group) |
1716fcea | 887 | { |
2121bcd9 | 888 | refcount_inc(&group->refcnt); |
1716fcea | 889 | } |
febd17d6 | 890 | +EXPORT_SYMBOL_GPL(fsnotify_get_group); |
1716fcea AM |
891 | |
892 | /* | |
893 | * Drop a reference to a group. Free it if it's through. | |
ffa93bbd | 894 | @@ -118,6 +120,7 @@ void fsnotify_put_group(struct fsnotify_group *group) |
2121bcd9 | 895 | if (refcount_dec_and_test(&group->refcnt)) |
1716fcea | 896 | fsnotify_final_destroy_group(group); |
7f207e10 | 897 | } |
febd17d6 | 898 | +EXPORT_SYMBOL_GPL(fsnotify_put_group); |
7f207e10 AM |
899 | |
900 | /* | |
901 | * Create a new fsnotify_group and hold a reference for the group returned. | |
ffa93bbd | 902 | @@ -147,6 +150,7 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) |
7f207e10 AM |
903 | |
904 | return group; | |
905 | } | |
febd17d6 | 906 | +EXPORT_SYMBOL_GPL(fsnotify_alloc_group); |
1716fcea AM |
907 | |
908 | int fsnotify_fasync(int fd, struct file *file, int on) | |
909 | { | |
7f207e10 | 910 | diff --git a/fs/notify/mark.c b/fs/notify/mark.c |
cd7a4cd9 | 911 | index 61f4c5f..855c655 100644 |
7f207e10 AM |
912 | --- a/fs/notify/mark.c |
913 | +++ b/fs/notify/mark.c | |
cd7a4cd9 AM |
914 | @@ -245,6 +245,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) |
915 | queue_delayed_work(system_unbound_wq, &reaper_work, | |
916 | FSNOTIFY_REAPER_DELAY); | |
7f207e10 | 917 | } |
febd17d6 | 918 | +EXPORT_SYMBOL_GPL(fsnotify_put_mark); |
7f207e10 | 919 | |
cd7a4cd9 AM |
920 | /* |
921 | * Get mark reference when we found the mark via lockless traversal of object | |
922 | @@ -399,6 +400,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark, | |
1716fcea | 923 | mutex_unlock(&group->mark_mutex); |
79b8bda9 | 924 | fsnotify_free_mark(mark); |
7f207e10 | 925 | } |
febd17d6 | 926 | +EXPORT_SYMBOL_GPL(fsnotify_destroy_mark); |
7f207e10 | 927 | |
ffa93bbd AM |
928 | /* |
929 | * Sorting function for lists of fsnotify marks. | |
cd7a4cd9 AM |
930 | @@ -624,6 +626,7 @@ int fsnotify_add_mark(struct fsnotify_mark *mark, struct inode *inode, |
931 | mutex_unlock(&group->mark_mutex); | |
7f207e10 AM |
932 | return ret; |
933 | } | |
febd17d6 | 934 | +EXPORT_SYMBOL_GPL(fsnotify_add_mark); |
7f207e10 | 935 | |
cd7a4cd9 AM |
936 | /* |
937 | * Given a list of marks, find the mark associated with given group. If found | |
938 | @@ -747,6 +750,7 @@ void fsnotify_init_mark(struct fsnotify_mark *mark, | |
ffa93bbd AM |
939 | fsnotify_get_group(group); |
940 | mark->group = group; | |
7f207e10 | 941 | } |
febd17d6 | 942 | +EXPORT_SYMBOL_GPL(fsnotify_init_mark); |
7f207e10 | 943 | |
5afbbe0d AM |
944 | /* |
945 | * Destroy all marks in destroy_list, waits for SRCU period to finish before | |
7f207e10 | 946 | diff --git a/fs/open.c b/fs/open.c |
c4adf169 | 947 | index d0e955b..527bc1a 100644 |
7f207e10 AM |
948 | --- a/fs/open.c |
949 | +++ b/fs/open.c | |
c2c0f25c | 950 | @@ -64,6 +64,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, |
febd17d6 | 951 | inode_unlock(dentry->d_inode); |
7f207e10 AM |
952 | return ret; |
953 | } | |
febd17d6 | 954 | +EXPORT_SYMBOL_GPL(do_truncate); |
7f207e10 | 955 | |
5afbbe0d | 956 | long vfs_truncate(const struct path *path, loff_t length) |
7f207e10 | 957 | { |
c4adf169 AM |
958 | @@ -723,6 +724,7 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group) |
959 | { | |
960 | return ksys_fchown(fd, user, group); | |
961 | } | |
962 | +EXPORT_SYMBOL_GPL(open_check_o_direct); | |
963 | ||
964 | int open_check_o_direct(struct file *f) | |
965 | { | |
5527c038 | 966 | diff --git a/fs/read_write.c b/fs/read_write.c |
cd7a4cd9 | 967 | index ccc5bc8..36f52f4 100644 |
5527c038 JR |
968 | --- a/fs/read_write.c |
969 | +++ b/fs/read_write.c | |
b00004a5 | 970 | @@ -459,6 +459,7 @@ ssize_t vfs_read(struct file *file, char __user *buf, size_t count, loff_t *pos) |
8b6a4947 AM |
971 | |
972 | return ret; | |
973 | } | |
974 | +EXPORT_SYMBOL_GPL(vfs_read); | |
975 | ||
976 | static ssize_t new_sync_write(struct file *filp, const char __user *buf, size_t len, loff_t *ppos) | |
977 | { | |
b00004a5 | 978 | @@ -499,6 +500,7 @@ vfs_readf_t vfs_readf(struct file *file) |
5527c038 JR |
979 | return new_sync_read; |
980 | return ERR_PTR(-ENOSYS); | |
981 | } | |
febd17d6 | 982 | +EXPORT_SYMBOL_GPL(vfs_readf); |
5527c038 JR |
983 | |
984 | vfs_writef_t vfs_writef(struct file *file) | |
985 | { | |
b00004a5 | 986 | @@ -510,6 +512,7 @@ vfs_writef_t vfs_writef(struct file *file) |
5527c038 JR |
987 | return new_sync_write; |
988 | return ERR_PTR(-ENOSYS); | |
989 | } | |
febd17d6 | 990 | +EXPORT_SYMBOL_GPL(vfs_writef); |
5527c038 | 991 | |
8b6a4947 AM |
992 | ssize_t __kernel_write(struct file *file, const void *buf, size_t count, loff_t *pos) |
993 | { | |
b00004a5 | 994 | @@ -579,6 +582,7 @@ ssize_t vfs_write(struct file *file, const char __user *buf, size_t count, loff_ |
8b6a4947 AM |
995 | |
996 | return ret; | |
997 | } | |
998 | +EXPORT_SYMBOL_GPL(vfs_write); | |
999 | ||
1000 | static inline loff_t file_pos_read(struct file *file) | |
5527c038 | 1001 | { |
7f207e10 | 1002 | diff --git a/fs/splice.c b/fs/splice.c |
cd7a4cd9 | 1003 | index 1dd7f96..a5e3bcb 100644 |
7f207e10 AM |
1004 | --- a/fs/splice.c |
1005 | +++ b/fs/splice.c | |
cd7a4cd9 | 1006 | @@ -851,6 +851,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
392086de AM |
1007 | |
1008 | return splice_write(pipe, out, ppos, len, flags); | |
7f207e10 | 1009 | } |
febd17d6 | 1010 | +EXPORT_SYMBOL_GPL(do_splice_from); |
7f207e10 AM |
1011 | |
1012 | /* | |
1013 | * Attempt to initiate a splice from a file to a pipe. | |
cd7a4cd9 | 1014 | @@ -880,6 +881,7 @@ long do_splice_to(struct file *in, loff_t *ppos, |
7f207e10 AM |
1015 | |
1016 | return splice_read(in, ppos, pipe, len, flags); | |
1017 | } | |
febd17d6 | 1018 | +EXPORT_SYMBOL_GPL(do_splice_to); |
7f207e10 AM |
1019 | |
1020 | /** | |
1021 | * splice_direct_to_actor - splices data directly between two non-pipes | |
a2654f78 | 1022 | diff --git a/fs/sync.c b/fs/sync.c |
b00004a5 | 1023 | index 2860782..ffd7ea4 100644 |
a2654f78 AM |
1024 | --- a/fs/sync.c |
1025 | +++ b/fs/sync.c | |
2121bcd9 | 1026 | @@ -39,6 +39,7 @@ int __sync_filesystem(struct super_block *sb, int wait) |
a2654f78 AM |
1027 | sb->s_op->sync_fs(sb, wait); |
1028 | return __sync_blockdev(sb->s_bdev, wait); | |
1029 | } | |
1030 | +EXPORT_SYMBOL_GPL(__sync_filesystem); | |
1031 | ||
1032 | /* | |
1033 | * Write out and wait upon all dirty data associated with this | |
c1595e42 | 1034 | diff --git a/fs/xattr.c b/fs/xattr.c |
cd7a4cd9 | 1035 | index f9cb1db..000b62b 100644 |
c1595e42 JR |
1036 | --- a/fs/xattr.c |
1037 | +++ b/fs/xattr.c | |
cd7a4cd9 | 1038 | @@ -296,6 +296,7 @@ vfs_getxattr_alloc(struct dentry *dentry, const char *name, char **xattr_value, |
c1595e42 JR |
1039 | *xattr_value = value; |
1040 | return error; | |
1041 | } | |
febd17d6 | 1042 | +EXPORT_SYMBOL_GPL(vfs_getxattr_alloc); |
c1595e42 | 1043 | |
febd17d6 | 1044 | ssize_t |
f2c43d5f | 1045 | __vfs_getxattr(struct dentry *dentry, struct inode *inode, const char *name, |
8b6a4947 | 1046 | diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c |
cd7a4cd9 | 1047 | index 720f070..4f58215 100644 |
8b6a4947 AM |
1048 | --- a/kernel/locking/lockdep.c |
1049 | +++ b/kernel/locking/lockdep.c | |
be118d29 | 1050 | @@ -151,6 +151,7 @@ inline struct lock_class *lockdep_hlock_class(struct held_lock *hlock) |
8b6a4947 AM |
1051 | } |
1052 | return lock_classes + hlock->class_idx - 1; | |
1053 | } | |
1054 | +EXPORT_SYMBOL_GPL(lockdep_hlock_class); | |
1055 | #define hlock_class(hlock) lockdep_hlock_class(hlock) | |
1056 | ||
1057 | #ifdef CONFIG_LOCK_STAT | |
8cdd5066 | 1058 | diff --git a/kernel/task_work.c b/kernel/task_work.c |
2121bcd9 | 1059 | index 0fef395..83fb1ec 100644 |
8cdd5066 JR |
1060 | --- a/kernel/task_work.c |
1061 | +++ b/kernel/task_work.c | |
2121bcd9 | 1062 | @@ -116,3 +116,4 @@ void task_work_run(void) |
8cdd5066 JR |
1063 | } while (work); |
1064 | } | |
1065 | } | |
febd17d6 | 1066 | +EXPORT_SYMBOL_GPL(task_work_run); |
7f207e10 | 1067 | diff --git a/security/commoncap.c b/security/commoncap.c |
cd7a4cd9 | 1068 | index f4c33ab..70563f1 100644 |
7f207e10 AM |
1069 | --- a/security/commoncap.c |
1070 | +++ b/security/commoncap.c | |
cd7a4cd9 | 1071 | @@ -1336,12 +1336,14 @@ int cap_mmap_addr(unsigned long addr) |
94337f0d | 1072 | } |
7f207e10 AM |
1073 | return ret; |
1074 | } | |
febd17d6 | 1075 | +EXPORT_SYMBOL_GPL(cap_mmap_addr); |
0c3ec466 AM |
1076 | |
1077 | int cap_mmap_file(struct file *file, unsigned long reqprot, | |
1078 | unsigned long prot, unsigned long flags) | |
1079 | { | |
1080 | return 0; | |
1081 | } | |
febd17d6 | 1082 | +EXPORT_SYMBOL_GPL(cap_mmap_file); |
c2c0f25c AM |
1083 | |
1084 | #ifdef CONFIG_SECURITY | |
1085 | ||
7f207e10 | 1086 | diff --git a/security/device_cgroup.c b/security/device_cgroup.c |
cd7a4cd9 | 1087 | index cd97929..424fd23 100644 |
7f207e10 AM |
1088 | --- a/security/device_cgroup.c |
1089 | +++ b/security/device_cgroup.c | |
2121bcd9 | 1090 | @@ -8,6 +8,7 @@ |
f6c5ef8b AM |
1091 | #include <linux/device_cgroup.h> |
1092 | #include <linux/cgroup.h> | |
1093 | #include <linux/ctype.h> | |
1094 | +#include <linux/export.h> | |
1095 | #include <linux/list.h> | |
1096 | #include <linux/uaccess.h> | |
1097 | #include <linux/seq_file.h> | |
2121bcd9 | 1098 | @@ -824,3 +825,4 @@ int __devcgroup_check_permission(short type, u32 major, u32 minor, |
7f207e10 | 1099 | |
2121bcd9 AM |
1100 | return 0; |
1101 | } | |
1102 | +EXPORT_SYMBOL_GPL(__devcgroup_check_permission); | |
7f207e10 | 1103 | diff --git a/security/security.c b/security/security.c |
cd7a4cd9 | 1104 | index 68f46d8..3bc1348 100644 |
7f207e10 AM |
1105 | --- a/security/security.c |
1106 | +++ b/security/security.c | |
b00004a5 | 1107 | @@ -537,6 +537,7 @@ int security_path_rmdir(const struct path *dir, struct dentry *dentry) |
7f207e10 | 1108 | return 0; |
c2c0f25c | 1109 | return call_int_hook(path_rmdir, 0, dir, dentry); |
7f207e10 | 1110 | } |
febd17d6 | 1111 | +EXPORT_SYMBOL_GPL(security_path_rmdir); |
7f207e10 | 1112 | |
5afbbe0d | 1113 | int security_path_unlink(const struct path *dir, struct dentry *dentry) |
7f207e10 | 1114 | { |
b00004a5 | 1115 | @@ -553,6 +554,7 @@ int security_path_symlink(const struct path *dir, struct dentry *dentry, |
7f207e10 | 1116 | return 0; |
c2c0f25c | 1117 | return call_int_hook(path_symlink, 0, dir, dentry, old_name); |
7f207e10 | 1118 | } |
febd17d6 | 1119 | +EXPORT_SYMBOL_GPL(security_path_symlink); |
7f207e10 | 1120 | |
5afbbe0d | 1121 | int security_path_link(struct dentry *old_dentry, const struct path *new_dir, |
7f207e10 | 1122 | struct dentry *new_dentry) |
b00004a5 | 1123 | @@ -561,6 +563,7 @@ int security_path_link(struct dentry *old_dentry, const struct path *new_dir, |
7f207e10 | 1124 | return 0; |
c2c0f25c | 1125 | return call_int_hook(path_link, 0, old_dentry, new_dir, new_dentry); |
7f207e10 | 1126 | } |
febd17d6 | 1127 | +EXPORT_SYMBOL_GPL(security_path_link); |
7f207e10 | 1128 | |
5afbbe0d AM |
1129 | int security_path_rename(const struct path *old_dir, struct dentry *old_dentry, |
1130 | const struct path *new_dir, struct dentry *new_dentry, | |
b00004a5 | 1131 | @@ -588,6 +591,7 @@ int security_path_truncate(const struct path *path) |
7f207e10 | 1132 | return 0; |
c2c0f25c | 1133 | return call_int_hook(path_truncate, 0, path); |
7f207e10 | 1134 | } |
febd17d6 | 1135 | +EXPORT_SYMBOL_GPL(security_path_truncate); |
7f207e10 | 1136 | |
5afbbe0d | 1137 | int security_path_chmod(const struct path *path, umode_t mode) |
7eafdf33 | 1138 | { |
b00004a5 | 1139 | @@ -595,6 +599,7 @@ int security_path_chmod(const struct path *path, umode_t mode) |
7f207e10 | 1140 | return 0; |
c2c0f25c | 1141 | return call_int_hook(path_chmod, 0, path, mode); |
7f207e10 | 1142 | } |
febd17d6 | 1143 | +EXPORT_SYMBOL_GPL(security_path_chmod); |
7f207e10 | 1144 | |
5afbbe0d | 1145 | int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
7f207e10 | 1146 | { |
b00004a5 | 1147 | @@ -602,6 +607,7 @@ int security_path_chown(const struct path *path, kuid_t uid, kgid_t gid) |
7f207e10 | 1148 | return 0; |
c2c0f25c | 1149 | return call_int_hook(path_chown, 0, path, uid, gid); |
7f207e10 | 1150 | } |
febd17d6 | 1151 | +EXPORT_SYMBOL_GPL(security_path_chown); |
7f207e10 | 1152 | |
5afbbe0d | 1153 | int security_path_chroot(const struct path *path) |
7f207e10 | 1154 | { |
b00004a5 | 1155 | @@ -687,6 +693,7 @@ int security_inode_readlink(struct dentry *dentry) |
7f207e10 | 1156 | return 0; |
c2c0f25c | 1157 | return call_int_hook(inode_readlink, 0, dentry); |
7f207e10 | 1158 | } |
febd17d6 | 1159 | +EXPORT_SYMBOL_GPL(security_inode_readlink); |
7f207e10 | 1160 | |
c2c0f25c AM |
1161 | int security_inode_follow_link(struct dentry *dentry, struct inode *inode, |
1162 | bool rcu) | |
b00004a5 | 1163 | @@ -702,6 +709,7 @@ int security_inode_permission(struct inode *inode, int mask) |
7f207e10 | 1164 | return 0; |
c2c0f25c | 1165 | return call_int_hook(inode_permission, 0, inode, mask); |
7f207e10 | 1166 | } |
febd17d6 | 1167 | +EXPORT_SYMBOL_GPL(security_inode_permission); |
7f207e10 | 1168 | |
1e00d052 | 1169 | int security_inode_setattr(struct dentry *dentry, struct iattr *attr) |
7f207e10 | 1170 | { |
b00004a5 | 1171 | @@ -873,6 +881,7 @@ int security_file_permission(struct file *file, int mask) |
7f207e10 AM |
1172 | |
1173 | return fsnotify_perm(file, mask); | |
1174 | } | |
febd17d6 | 1175 | +EXPORT_SYMBOL_GPL(security_file_permission); |
7f207e10 AM |
1176 | |
1177 | int security_file_alloc(struct file *file) | |
1178 | { | |
b00004a5 | 1179 | @@ -932,6 +941,7 @@ int security_mmap_file(struct file *file, unsigned long prot, |
7f207e10 AM |
1180 | return ret; |
1181 | return ima_file_mmap(file, prot); | |
1182 | } | |
febd17d6 | 1183 | +EXPORT_SYMBOL_GPL(security_mmap_file); |
7f207e10 | 1184 | |
0c3ec466 AM |
1185 | int security_mmap_addr(unsigned long addr) |
1186 | { | |
7f207e10 AM |
1187 | diff -urN /usr/share/empty/Documentation/ABI/testing/debugfs-aufs linux/Documentation/ABI/testing/debugfs-aufs |
1188 | --- /usr/share/empty/Documentation/ABI/testing/debugfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 1189 | +++ linux/Documentation/ABI/testing/debugfs-aufs 2018-08-12 23:43:05.450124426 +0200 |
062440b3 | 1190 | @@ -0,0 +1,55 @@ |
7f207e10 AM |
1191 | +What: /debug/aufs/si_<id>/ |
1192 | +Date: March 2009 | |
f6b6e03d | 1193 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1194 | +Description: |
1195 | + Under /debug/aufs, a directory named si_<id> is created | |
1196 | + per aufs mount, where <id> is a unique id generated | |
1197 | + internally. | |
1facf9fc | 1198 | + |
86dc4139 AM |
1199 | +What: /debug/aufs/si_<id>/plink |
1200 | +Date: Apr 2013 | |
f6b6e03d | 1201 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
86dc4139 AM |
1202 | +Description: |
1203 | + It has three lines and shows the information about the | |
1204 | + pseudo-link. The first line is a single number | |
1205 | + representing a number of buckets. The second line is a | |
1206 | + number of pseudo-links per buckets (separated by a | |
1207 | + blank). The last line is a single number representing a | |
1208 | + total number of psedo-links. | |
1209 | + When the aufs mount option 'noplink' is specified, it | |
1210 | + will show "1\n0\n0\n". | |
1211 | + | |
7f207e10 AM |
1212 | +What: /debug/aufs/si_<id>/xib |
1213 | +Date: March 2009 | |
f6b6e03d | 1214 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1215 | +Description: |
1216 | + It shows the consumed blocks by xib (External Inode Number | |
1217 | + Bitmap), its block size and file size. | |
1218 | + When the aufs mount option 'noxino' is specified, it | |
1219 | + will be empty. About XINO files, see the aufs manual. | |
1220 | + | |
062440b3 | 1221 | +What: /debug/aufs/si_<id>/xi0, xi1 ... xiN and xiN-N |
7f207e10 | 1222 | +Date: March 2009 |
f6b6e03d | 1223 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1224 | +Description: |
1225 | + It shows the consumed blocks by xino (External Inode Number | |
1226 | + Translation Table), its link count, block size and file | |
1227 | + size. | |
062440b3 AM |
1228 | + Due to the file size limit, there may exist multiple |
1229 | + xino files per branch. In this case, "-N" is added to | |
1230 | + the filename and it corresponds to the index of the | |
1231 | + internal xino array. "-0" is omitted. | |
1232 | + When the aufs mount option 'noxino' is specified, Those | |
1233 | + entries won't exist. About XINO files, see the aufs | |
1234 | + manual. | |
7f207e10 AM |
1235 | + |
1236 | +What: /debug/aufs/si_<id>/xigen | |
1237 | +Date: March 2009 | |
f6b6e03d | 1238 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1239 | +Description: |
1240 | + It shows the consumed blocks by xigen (External Inode | |
1241 | + Generation Table), its block size and file size. | |
1242 | + If CONFIG_AUFS_EXPORT is disabled, this entry will not | |
1243 | + be created. | |
1244 | + When the aufs mount option 'noxino' is specified, it | |
1245 | + will be empty. About XINO files, see the aufs manual. | |
1246 | diff -urN /usr/share/empty/Documentation/ABI/testing/sysfs-aufs linux/Documentation/ABI/testing/sysfs-aufs | |
1247 | --- /usr/share/empty/Documentation/ABI/testing/sysfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1248 | +++ linux/Documentation/ABI/testing/sysfs-aufs 2017-07-29 12:14:25.893041746 +0200 |
392086de | 1249 | @@ -0,0 +1,31 @@ |
7f207e10 AM |
1250 | +What: /sys/fs/aufs/si_<id>/ |
1251 | +Date: March 2009 | |
f6b6e03d | 1252 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1253 | +Description: |
1254 | + Under /sys/fs/aufs, a directory named si_<id> is created | |
1255 | + per aufs mount, where <id> is a unique id generated | |
1256 | + internally. | |
1257 | + | |
1258 | +What: /sys/fs/aufs/si_<id>/br0, br1 ... brN | |
1259 | +Date: March 2009 | |
f6b6e03d | 1260 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1261 | +Description: |
1262 | + It shows the abolute path of a member directory (which | |
1263 | + is called branch) in aufs, and its permission. | |
1264 | + | |
392086de AM |
1265 | +What: /sys/fs/aufs/si_<id>/brid0, brid1 ... bridN |
1266 | +Date: July 2013 | |
f6b6e03d | 1267 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
392086de AM |
1268 | +Description: |
1269 | + It shows the id of a member directory (which is called | |
1270 | + branch) in aufs. | |
1271 | + | |
7f207e10 AM |
1272 | +What: /sys/fs/aufs/si_<id>/xi_path |
1273 | +Date: March 2009 | |
f6b6e03d | 1274 | +Contact: J. R. Okajima <hooanon05g@gmail.com> |
7f207e10 AM |
1275 | +Description: |
1276 | + It shows the abolute path of XINO (External Inode Number | |
1277 | + Bitmap, Translation Table and Generation Table) file | |
1278 | + even if it is the default path. | |
1279 | + When the aufs mount option 'noxino' is specified, it | |
1280 | + will be empty. About XINO files, see the aufs manual. | |
53392da6 AM |
1281 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt linux/Documentation/filesystems/aufs/design/01intro.txt |
1282 | --- /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1283 | +++ linux/Documentation/filesystems/aufs/design/01intro.txt 2018-04-15 08:49:13.394483860 +0200 |
1c60b727 | 1284 | @@ -0,0 +1,171 @@ |
53392da6 | 1285 | + |
b00004a5 | 1286 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
1287 | +# |
1288 | +# This program is free software; you can redistribute it and/or modify | |
1289 | +# it under the terms of the GNU General Public License as published by | |
1290 | +# the Free Software Foundation; either version 2 of the License, or | |
1291 | +# (at your option) any later version. | |
1292 | +# | |
1293 | +# This program is distributed in the hope that it will be useful, | |
1294 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1295 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1296 | +# GNU General Public License for more details. | |
1297 | +# | |
1298 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1299 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1300 | + |
1301 | +Introduction | |
1302 | +---------------------------------------- | |
1303 | + | |
3c1bdaff | 1304 | +aufs [ei ju: ef es] | /ey-yoo-ef-es/ | [a u f s] |
53392da6 AM |
1305 | +1. abbrev. for "advanced multi-layered unification filesystem". |
1306 | +2. abbrev. for "another unionfs". | |
1307 | +3. abbrev. for "auf das" in German which means "on the" in English. | |
1308 | + Ex. "Butter aufs Brot"(G) means "butter onto bread"(E). | |
1309 | + But "Filesystem aufs Filesystem" is hard to understand. | |
1c60b727 | 1310 | +4. abbrev. for "African Urban Fashion Show". |
53392da6 AM |
1311 | + |
1312 | +AUFS is a filesystem with features: | |
1313 | +- multi layered stackable unification filesystem, the member directory | |
1314 | + is called as a branch. | |
1315 | +- branch permission and attribute, 'readonly', 'real-readonly', | |
7e9cd9fe | 1316 | + 'readwrite', 'whiteout-able', 'link-able whiteout', etc. and their |
53392da6 AM |
1317 | + combination. |
1318 | +- internal "file copy-on-write". | |
1319 | +- logical deletion, whiteout. | |
1320 | +- dynamic branch manipulation, adding, deleting and changing permission. | |
1321 | +- allow bypassing aufs, user's direct branch access. | |
1322 | +- external inode number translation table and bitmap which maintains the | |
1323 | + persistent aufs inode number. | |
1324 | +- seekable directory, including NFS readdir. | |
1325 | +- file mapping, mmap and sharing pages. | |
1326 | +- pseudo-link, hardlink over branches. | |
1327 | +- loopback mounted filesystem as a branch. | |
1328 | +- several policies to select one among multiple writable branches. | |
1329 | +- revert a single systemcall when an error occurs in aufs. | |
1330 | +- and more... | |
1331 | + | |
1332 | + | |
1333 | +Multi Layered Stackable Unification Filesystem | |
1334 | +---------------------------------------------------------------------- | |
1335 | +Most people already knows what it is. | |
1336 | +It is a filesystem which unifies several directories and provides a | |
1337 | +merged single directory. When users access a file, the access will be | |
1338 | +passed/re-directed/converted (sorry, I am not sure which English word is | |
1339 | +correct) to the real file on the member filesystem. The member | |
1340 | +filesystem is called 'lower filesystem' or 'branch' and has a mode | |
1341 | +'readonly' and 'readwrite.' And the deletion for a file on the lower | |
1342 | +readonly branch is handled by creating 'whiteout' on the upper writable | |
1343 | +branch. | |
1344 | + | |
1345 | +On LKML, there have been discussions about UnionMount (Jan Blunck, | |
1346 | +Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took | |
1347 | +different approaches to implement the merged-view. | |
1348 | +The former tries putting it into VFS, and the latter implements as a | |
1349 | +separate filesystem. | |
1350 | +(If I misunderstand about these implementations, please let me know and | |
1351 | +I shall correct it. Because it is a long time ago when I read their | |
1352 | +source files last time). | |
1353 | + | |
1354 | +UnionMount's approach will be able to small, but may be hard to share | |
1355 | +branches between several UnionMount since the whiteout in it is | |
1356 | +implemented in the inode on branch filesystem and always | |
1357 | +shared. According to Bharata's post, readdir does not seems to be | |
1358 | +finished yet. | |
1359 | +There are several missing features known in this implementations such as | |
1360 | +- for users, the inode number may change silently. eg. copy-up. | |
1361 | +- link(2) may break by copy-up. | |
1362 | +- read(2) may get an obsoleted filedata (fstat(2) too). | |
1363 | +- fcntl(F_SETLK) may be broken by copy-up. | |
1364 | +- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after | |
1365 | + open(O_RDWR). | |
1366 | + | |
7e9cd9fe AM |
1367 | +In linux-3.18, "overlay" filesystem (formerly known as "overlayfs") was |
1368 | +merged into mainline. This is another implementation of UnionMount as a | |
1369 | +separated filesystem. All the limitations and known problems which | |
1370 | +UnionMount are equally inherited to "overlay" filesystem. | |
1371 | + | |
1372 | +Unionfs has a longer history. When I started implementing a stackable | |
1373 | +filesystem (Aug 2005), it already existed. It has virtual super_block, | |
1374 | +inode, dentry and file objects and they have an array pointing lower | |
1375 | +same kind objects. After contributing many patches for Unionfs, I | |
1376 | +re-started my project AUFS (Jun 2006). | |
53392da6 AM |
1377 | + |
1378 | +In AUFS, the structure of filesystem resembles to Unionfs, but I | |
1379 | +implemented my own ideas, approaches and enhancements and it became | |
1380 | +totally different one. | |
1381 | + | |
1382 | +Comparing DM snapshot and fs based implementation | |
1383 | +- the number of bytes to be copied between devices is much smaller. | |
1384 | +- the type of filesystem must be one and only. | |
1385 | +- the fs must be writable, no readonly fs, even for the lower original | |
1386 | + device. so the compression fs will not be usable. but if we use | |
1387 | + loopback mount, we may address this issue. | |
1388 | + for instance, | |
1389 | + mount /cdrom/squashfs.img /sq | |
1390 | + losetup /sq/ext2.img | |
1391 | + losetup /somewhere/cow | |
1392 | + dmsetup "snapshot /dev/loop0 /dev/loop1 ..." | |
1393 | +- it will be difficult (or needs more operations) to extract the | |
1394 | + difference between the original device and COW. | |
1395 | +- DM snapshot-merge may help a lot when users try merging. in the | |
1396 | + fs-layer union, users will use rsync(1). | |
1397 | + | |
7e9cd9fe AM |
1398 | +You may want to read my old paper "Filesystems in LiveCD" |
1399 | +(http://aufs.sourceforge.net/aufs2/report/sq/sq.pdf). | |
53392da6 | 1400 | + |
7e9cd9fe AM |
1401 | + |
1402 | +Several characters/aspects/persona of aufs | |
53392da6 AM |
1403 | +---------------------------------------------------------------------- |
1404 | + | |
7e9cd9fe | 1405 | +Aufs has several characters, aspects or persona. |
53392da6 AM |
1406 | +1. a filesystem, callee of VFS helper |
1407 | +2. sub-VFS, caller of VFS helper for branches | |
1408 | +3. a virtual filesystem which maintains persistent inode number | |
1409 | +4. reader/writer of files on branches such like an application | |
1410 | + | |
1411 | +1. Callee of VFS Helper | |
1412 | +As an ordinary linux filesystem, aufs is a callee of VFS. For instance, | |
1413 | +unlink(2) from an application reaches sys_unlink() kernel function and | |
1414 | +then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it | |
1415 | +calls filesystem specific unlink operation. Actually aufs implements the | |
1416 | +unlink operation but it behaves like a redirector. | |
1417 | + | |
1418 | +2. Caller of VFS Helper for Branches | |
1419 | +aufs_unlink() passes the unlink request to the branch filesystem as if | |
1420 | +it were called from VFS. So the called unlink operation of the branch | |
1421 | +filesystem acts as usual. As a caller of VFS helper, aufs should handle | |
1422 | +every necessary pre/post operation for the branch filesystem. | |
1423 | +- acquire the lock for the parent dir on a branch | |
1424 | +- lookup in a branch | |
1425 | +- revalidate dentry on a branch | |
1426 | +- mnt_want_write() for a branch | |
1427 | +- vfs_unlink() for a branch | |
1428 | +- mnt_drop_write() for a branch | |
1429 | +- release the lock on a branch | |
1430 | + | |
1431 | +3. Persistent Inode Number | |
1432 | +One of the most important issue for a filesystem is to maintain inode | |
1433 | +numbers. This is particularly important to support exporting a | |
1434 | +filesystem via NFS. Aufs is a virtual filesystem which doesn't have a | |
1435 | +backend block device for its own. But some storage is necessary to | |
7e9cd9fe AM |
1436 | +keep and maintain the inode numbers. It may be a large space and may not |
1437 | +suit to keep in memory. Aufs rents some space from its first writable | |
1438 | +branch filesystem (by default) and creates file(s) on it. These files | |
1439 | +are created by aufs internally and removed soon (currently) keeping | |
1440 | +opened. | |
53392da6 AM |
1441 | +Note: Because these files are removed, they are totally gone after |
1442 | + unmounting aufs. It means the inode numbers are not persistent | |
1443 | + across unmount or reboot. I have a plan to make them really | |
1444 | + persistent which will be important for aufs on NFS server. | |
1445 | + | |
1446 | +4. Read/Write Files Internally (copy-on-write) | |
1447 | +Because a branch can be readonly, when you write a file on it, aufs will | |
1448 | +"copy-up" it to the upper writable branch internally. And then write the | |
1449 | +originally requested thing to the file. Generally kernel doesn't | |
1450 | +open/read/write file actively. In aufs, even a single write may cause a | |
1451 | +internal "file copy". This behaviour is very similar to cp(1) command. | |
1452 | + | |
1453 | +Some people may think it is better to pass such work to user space | |
1454 | +helper, instead of doing in kernel space. Actually I am still thinking | |
1455 | +about it. But currently I have implemented it in kernel space. | |
1456 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt linux/Documentation/filesystems/aufs/design/02struct.txt | |
1457 | --- /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1458 | +++ linux/Documentation/filesystems/aufs/design/02struct.txt 2018-04-15 08:49:13.394483860 +0200 |
7e9cd9fe | 1459 | @@ -0,0 +1,258 @@ |
53392da6 | 1460 | + |
b00004a5 | 1461 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
1462 | +# |
1463 | +# This program is free software; you can redistribute it and/or modify | |
1464 | +# it under the terms of the GNU General Public License as published by | |
1465 | +# the Free Software Foundation; either version 2 of the License, or | |
1466 | +# (at your option) any later version. | |
1467 | +# | |
1468 | +# This program is distributed in the hope that it will be useful, | |
1469 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1470 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1471 | +# GNU General Public License for more details. | |
1472 | +# | |
1473 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1474 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1475 | + |
1476 | +Basic Aufs Internal Structure | |
1477 | + | |
1478 | +Superblock/Inode/Dentry/File Objects | |
1479 | +---------------------------------------------------------------------- | |
1480 | +As like an ordinary filesystem, aufs has its own | |
1481 | +superblock/inode/dentry/file objects. All these objects have a | |
1482 | +dynamically allocated array and store the same kind of pointers to the | |
1483 | +lower filesystem, branch. | |
1484 | +For example, when you build a union with one readwrite branch and one | |
1485 | +readonly, mounted /au, /rw and /ro respectively. | |
1486 | +- /au = /rw + /ro | |
1487 | +- /ro/fileA exists but /rw/fileA | |
1488 | + | |
1489 | +Aufs lookup operation finds /ro/fileA and gets dentry for that. These | |
1490 | +pointers are stored in a aufs dentry. The array in aufs dentry will be, | |
7e9cd9fe | 1491 | +- [0] = NULL (because /rw/fileA doesn't exist) |
53392da6 AM |
1492 | +- [1] = /ro/fileA |
1493 | + | |
1494 | +This style of an array is essentially same to the aufs | |
1495 | +superblock/inode/dentry/file objects. | |
1496 | + | |
1497 | +Because aufs supports manipulating branches, ie. add/delete/change | |
7e9cd9fe AM |
1498 | +branches dynamically, these objects has its own generation. When |
1499 | +branches are changed, the generation in aufs superblock is | |
1500 | +incremented. And a generation in other object are compared when it is | |
1501 | +accessed. When a generation in other objects are obsoleted, aufs | |
1502 | +refreshes the internal array. | |
53392da6 AM |
1503 | + |
1504 | + | |
1505 | +Superblock | |
1506 | +---------------------------------------------------------------------- | |
1507 | +Additionally aufs superblock has some data for policies to select one | |
1508 | +among multiple writable branches, XIB files, pseudo-links and kobject. | |
1509 | +See below in detail. | |
7e9cd9fe AM |
1510 | +About the policies which supports copy-down a directory, see |
1511 | +wbr_policy.txt too. | |
53392da6 AM |
1512 | + |
1513 | + | |
1514 | +Branch and XINO(External Inode Number Translation Table) | |
1515 | +---------------------------------------------------------------------- | |
1516 | +Every branch has its own xino (external inode number translation table) | |
1517 | +file. The xino file is created and unlinked by aufs internally. When two | |
1518 | +members of a union exist on the same filesystem, they share the single | |
1519 | +xino file. | |
1520 | +The struct of a xino file is simple, just a sequence of aufs inode | |
1521 | +numbers which is indexed by the lower inode number. | |
1522 | +In the above sample, assume the inode number of /ro/fileA is i111 and | |
1523 | +aufs assigns the inode number i999 for fileA. Then aufs writes 999 as | |
1524 | +4(8) bytes at 111 * 4(8) bytes offset in the xino file. | |
1525 | + | |
1526 | +When the inode numbers are not contiguous, the xino file will be sparse | |
1527 | +which has a hole in it and doesn't consume as much disk space as it | |
1528 | +might appear. If your branch filesystem consumes disk space for such | |
1529 | +holes, then you should specify 'xino=' option at mounting aufs. | |
1530 | + | |
7e9cd9fe AM |
1531 | +Aufs has a mount option to free the disk blocks for such holes in XINO |
1532 | +files on tmpfs or ramdisk. But it is not so effective actually. If you | |
1533 | +meet a problem of disk shortage due to XINO files, then you should try | |
1534 | +"tmpfs-ino.patch" (and "vfs-ino.patch" too) in aufs4-standalone.git. | |
1535 | +The patch localizes the assignment inumbers per tmpfs-mount and avoid | |
1536 | +the holes in XINO files. | |
1537 | + | |
53392da6 | 1538 | +Also a writable branch has three kinds of "whiteout bases". All these |
7e9cd9fe | 1539 | +are existed when the branch is joined to aufs, and their names are |
53392da6 AM |
1540 | +whiteout-ed doubly, so that users will never see their names in aufs |
1541 | +hierarchy. | |
7e9cd9fe | 1542 | +1. a regular file which will be hardlinked to all whiteouts. |
53392da6 | 1543 | +2. a directory to store a pseudo-link. |
7e9cd9fe | 1544 | +3. a directory to store an "orphan"-ed file temporary. |
53392da6 AM |
1545 | + |
1546 | +1. Whiteout Base | |
1547 | + When you remove a file on a readonly branch, aufs handles it as a | |
1548 | + logical deletion and creates a whiteout on the upper writable branch | |
1549 | + as a hardlink of this file in order not to consume inode on the | |
1550 | + writable branch. | |
1551 | +2. Pseudo-link Dir | |
1552 | + See below, Pseudo-link. | |
1553 | +3. Step-Parent Dir | |
1554 | + When "fileC" exists on the lower readonly branch only and it is | |
1555 | + opened and removed with its parent dir, and then user writes | |
1556 | + something into it, then aufs copies-up fileC to this | |
1557 | + directory. Because there is no other dir to store fileC. After | |
1558 | + creating a file under this dir, the file is unlinked. | |
1559 | + | |
1560 | +Because aufs supports manipulating branches, ie. add/delete/change | |
7e9cd9fe AM |
1561 | +dynamically, a branch has its own id. When the branch order changes, |
1562 | +aufs finds the new index by searching the branch id. | |
53392da6 AM |
1563 | + |
1564 | + | |
1565 | +Pseudo-link | |
1566 | +---------------------------------------------------------------------- | |
1567 | +Assume "fileA" exists on the lower readonly branch only and it is | |
1568 | +hardlinked to "fileB" on the branch. When you write something to fileA, | |
1569 | +aufs copies-up it to the upper writable branch. Additionally aufs | |
1570 | +creates a hardlink under the Pseudo-link Directory of the writable | |
1571 | +branch. The inode of a pseudo-link is kept in aufs super_block as a | |
1572 | +simple list. If fileB is read after unlinking fileA, aufs returns | |
1573 | +filedata from the pseudo-link instead of the lower readonly | |
1574 | +branch. Because the pseudo-link is based upon the inode, to keep the | |
7e9cd9fe | 1575 | +inode number by xino (see above) is essentially necessary. |
53392da6 AM |
1576 | + |
1577 | +All the hardlinks under the Pseudo-link Directory of the writable branch | |
1578 | +should be restored in a proper location later. Aufs provides a utility | |
1579 | +to do this. The userspace helpers executed at remounting and unmounting | |
1580 | +aufs by default. | |
1581 | +During this utility is running, it puts aufs into the pseudo-link | |
1582 | +maintenance mode. In this mode, only the process which began the | |
1583 | +maintenance mode (and its child processes) is allowed to operate in | |
1584 | +aufs. Some other processes which are not related to the pseudo-link will | |
1585 | +be allowed to run too, but the rest have to return an error or wait | |
1586 | +until the maintenance mode ends. If a process already acquires an inode | |
1587 | +mutex (in VFS), it has to return an error. | |
1588 | + | |
1589 | + | |
1590 | +XIB(external inode number bitmap) | |
1591 | +---------------------------------------------------------------------- | |
1592 | +Addition to the xino file per a branch, aufs has an external inode number | |
7e9cd9fe AM |
1593 | +bitmap in a superblock object. It is also an internal file such like a |
1594 | +xino file. | |
53392da6 AM |
1595 | +It is a simple bitmap to mark whether the aufs inode number is in-use or |
1596 | +not. | |
1597 | +To reduce the file I/O, aufs prepares a single memory page to cache xib. | |
1598 | + | |
7e9cd9fe | 1599 | +As well as XINO files, aufs has a feature to truncate/refresh XIB to |
53392da6 AM |
1600 | +reduce the number of consumed disk blocks for these files. |
1601 | + | |
1602 | + | |
1603 | +Virtual or Vertical Dir, and Readdir in Userspace | |
1604 | +---------------------------------------------------------------------- | |
1605 | +In order to support multiple layers (branches), aufs readdir operation | |
1606 | +constructs a virtual dir block on memory. For readdir, aufs calls | |
1607 | +vfs_readdir() internally for each dir on branches, merges their entries | |
1608 | +with eliminating the whiteout-ed ones, and sets it to file (dir) | |
1609 | +object. So the file object has its entry list until it is closed. The | |
1610 | +entry list will be updated when the file position is zero and becomes | |
7e9cd9fe | 1611 | +obsoleted. This decision is made in aufs automatically. |
53392da6 AM |
1612 | + |
1613 | +The dynamically allocated memory block for the name of entries has a | |
1614 | +unit of 512 bytes (by default) and stores the names contiguously (no | |
1615 | +padding). Another block for each entry is handled by kmem_cache too. | |
1616 | +During building dir blocks, aufs creates hash list and judging whether | |
1617 | +the entry is whiteouted by its upper branch or already listed. | |
1618 | +The merged result is cached in the corresponding inode object and | |
1619 | +maintained by a customizable life-time option. | |
1620 | + | |
1621 | +Some people may call it can be a security hole or invite DoS attack | |
1622 | +since the opened and once readdir-ed dir (file object) holds its entry | |
1623 | +list and becomes a pressure for system memory. But I'd say it is similar | |
1624 | +to files under /proc or /sys. The virtual files in them also holds a | |
1625 | +memory page (generally) while they are opened. When an idea to reduce | |
1626 | +memory for them is introduced, it will be applied to aufs too. | |
1627 | +For those who really hate this situation, I've developed readdir(3) | |
1628 | +library which operates this merging in userspace. You just need to set | |
1629 | +LD_PRELOAD environment variable, and aufs will not consume no memory in | |
1630 | +kernel space for readdir(3). | |
1631 | + | |
1632 | + | |
1633 | +Workqueue | |
1634 | +---------------------------------------------------------------------- | |
1635 | +Aufs sometimes requires privilege access to a branch. For instance, | |
1636 | +in copy-up/down operation. When a user process is going to make changes | |
1637 | +to a file which exists in the lower readonly branch only, and the mode | |
1638 | +of one of ancestor directories may not be writable by a user | |
1639 | +process. Here aufs copy-up the file with its ancestors and they may | |
1640 | +require privilege to set its owner/group/mode/etc. | |
1641 | +This is a typical case of a application character of aufs (see | |
1642 | +Introduction). | |
1643 | + | |
1644 | +Aufs uses workqueue synchronously for this case. It creates its own | |
1645 | +workqueue. The workqueue is a kernel thread and has privilege. Aufs | |
1646 | +passes the request to call mkdir or write (for example), and wait for | |
1647 | +its completion. This approach solves a problem of a signal handler | |
1648 | +simply. | |
1649 | +If aufs didn't adopt the workqueue and changed the privilege of the | |
7e9cd9fe AM |
1650 | +process, then the process may receive the unexpected SIGXFSZ or other |
1651 | +signals. | |
53392da6 AM |
1652 | + |
1653 | +Also aufs uses the system global workqueue ("events" kernel thread) too | |
1654 | +for asynchronous tasks, such like handling inotify/fsnotify, re-creating a | |
1655 | +whiteout base and etc. This is unrelated to a privilege. | |
1656 | +Most of aufs operation tries acquiring a rw_semaphore for aufs | |
1657 | +superblock at the beginning, at the same time waits for the completion | |
1658 | +of all queued asynchronous tasks. | |
1659 | + | |
1660 | + | |
1661 | +Whiteout | |
1662 | +---------------------------------------------------------------------- | |
1663 | +The whiteout in aufs is very similar to Unionfs's. That is represented | |
1664 | +by its filename. UnionMount takes an approach of a file mode, but I am | |
1665 | +afraid several utilities (find(1) or something) will have to support it. | |
1666 | + | |
1667 | +Basically the whiteout represents "logical deletion" which stops aufs to | |
1668 | +lookup further, but also it represents "dir is opaque" which also stop | |
7e9cd9fe | 1669 | +further lookup. |
53392da6 AM |
1670 | + |
1671 | +In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively. | |
1672 | +In order to make several functions in a single systemcall to be | |
1673 | +revertible, aufs adopts an approach to rename a directory to a temporary | |
1674 | +unique whiteouted name. | |
1675 | +For example, in rename(2) dir where the target dir already existed, aufs | |
1676 | +renames the target dir to a temporary unique whiteouted name before the | |
7e9cd9fe | 1677 | +actual rename on a branch, and then handles other actions (make it opaque, |
53392da6 AM |
1678 | +update the attributes, etc). If an error happens in these actions, aufs |
1679 | +simply renames the whiteouted name back and returns an error. If all are | |
1680 | +succeeded, aufs registers a function to remove the whiteouted unique | |
1681 | +temporary name completely and asynchronously to the system global | |
1682 | +workqueue. | |
1683 | + | |
1684 | + | |
1685 | +Copy-up | |
1686 | +---------------------------------------------------------------------- | |
1687 | +It is a well-known feature or concept. | |
1688 | +When user modifies a file on a readonly branch, aufs operate "copy-up" | |
1689 | +internally and makes change to the new file on the upper writable branch. | |
1690 | +When the trigger systemcall does not update the timestamps of the parent | |
1691 | +dir, aufs reverts it after copy-up. | |
c2b27bf2 AM |
1692 | + |
1693 | + | |
1694 | +Move-down (aufs3.9 and later) | |
1695 | +---------------------------------------------------------------------- | |
1696 | +"Copy-up" is one of the essential feature in aufs. It copies a file from | |
1697 | +the lower readonly branch to the upper writable branch when a user | |
1698 | +changes something about the file. | |
1699 | +"Move-down" is an opposite action of copy-up. Basically this action is | |
1700 | +ran manually instead of automatically and internally. | |
076b876e AM |
1701 | +For desgin and implementation, aufs has to consider these issues. |
1702 | +- whiteout for the file may exist on the lower branch. | |
1703 | +- ancestor directories may not exist on the lower branch. | |
1704 | +- diropq for the ancestor directories may exist on the upper branch. | |
1705 | +- free space on the lower branch will reduce. | |
1706 | +- another access to the file may happen during moving-down, including | |
7e9cd9fe | 1707 | + UDBA (see "Revalidate Dentry and UDBA"). |
076b876e AM |
1708 | +- the file should not be hard-linked nor pseudo-linked. they should be |
1709 | + handled by auplink utility later. | |
c2b27bf2 AM |
1710 | + |
1711 | +Sometimes users want to move-down a file from the upper writable branch | |
1712 | +to the lower readonly or writable branch. For instance, | |
1713 | +- the free space of the upper writable branch is going to run out. | |
1714 | +- create a new intermediate branch between the upper and lower branch. | |
1715 | +- etc. | |
1716 | + | |
1717 | +For this purpose, use "aumvdown" command in aufs-util.git. | |
b912730e AM |
1718 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/03atomic_open.txt linux/Documentation/filesystems/aufs/design/03atomic_open.txt |
1719 | --- /usr/share/empty/Documentation/filesystems/aufs/design/03atomic_open.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1720 | +++ linux/Documentation/filesystems/aufs/design/03atomic_open.txt 2018-04-15 08:49:13.394483860 +0200 |
b912730e AM |
1721 | @@ -0,0 +1,85 @@ |
1722 | + | |
b00004a5 | 1723 | +# Copyright (C) 2015-2018 Junjiro R. Okajima |
b912730e AM |
1724 | +# |
1725 | +# This program is free software; you can redistribute it and/or modify | |
1726 | +# it under the terms of the GNU General Public License as published by | |
1727 | +# the Free Software Foundation; either version 2 of the License, or | |
1728 | +# (at your option) any later version. | |
1729 | +# | |
1730 | +# This program is distributed in the hope that it will be useful, | |
1731 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1732 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1733 | +# GNU General Public License for more details. | |
1734 | +# | |
1735 | +# You should have received a copy of the GNU General Public License | |
1736 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
1737 | + | |
1738 | +Support for a branch who has its ->atomic_open() | |
1739 | +---------------------------------------------------------------------- | |
1740 | +The filesystems who implement its ->atomic_open() are not majority. For | |
1741 | +example NFSv4 does, and aufs should call NFSv4 ->atomic_open, | |
1742 | +particularly for open(O_CREAT|O_EXCL, 0400) case. Other than | |
1743 | +->atomic_open(), NFSv4 returns an error for this open(2). While I am not | |
1744 | +sure whether all filesystems who have ->atomic_open() behave like this, | |
1745 | +but NFSv4 surely returns the error. | |
1746 | + | |
1747 | +In order to support ->atomic_open() for aufs, there are a few | |
1748 | +approaches. | |
1749 | + | |
1750 | +A. Introduce aufs_atomic_open() | |
1751 | + - calls one of VFS:do_last(), lookup_open() or atomic_open() for | |
1752 | + branch fs. | |
1753 | +B. Introduce aufs_atomic_open() calling create, open and chmod. this is | |
1754 | + an aufs user Pip Cet's approach | |
1755 | + - calls aufs_create(), VFS finish_open() and notify_change(). | |
1756 | + - pass fake-mode to finish_open(), and then correct the mode by | |
1757 | + notify_change(). | |
1758 | +C. Extend aufs_open() to call branch fs's ->atomic_open() | |
1759 | + - no aufs_atomic_open(). | |
1760 | + - aufs_lookup() registers the TID to an aufs internal object. | |
1761 | + - aufs_create() does nothing when the matching TID is registered, but | |
1762 | + registers the mode. | |
1763 | + - aufs_open() calls branch fs's ->atomic_open() when the matching | |
1764 | + TID is registered. | |
1765 | +D. Extend aufs_open() to re-try branch fs's ->open() with superuser's | |
1766 | + credential | |
1767 | + - no aufs_atomic_open(). | |
1768 | + - aufs_create() registers the TID to an internal object. this info | |
1769 | + represents "this process created this file just now." | |
1770 | + - when aufs gets EACCES from branch fs's ->open(), then confirm the | |
1771 | + registered TID and re-try open() with superuser's credential. | |
1772 | + | |
1773 | +Pros and cons for each approach. | |
1774 | + | |
1775 | +A. | |
1776 | + - straightforward but highly depends upon VFS internal. | |
1777 | + - the atomic behavaiour is kept. | |
1778 | + - some of parameters such as nameidata are hard to reproduce for | |
1779 | + branch fs. | |
1780 | + - large overhead. | |
1781 | +B. | |
1782 | + - easy to implement. | |
1783 | + - the atomic behavaiour is lost. | |
1784 | +C. | |
1785 | + - the atomic behavaiour is kept. | |
1786 | + - dirty and tricky. | |
1787 | + - VFS checks whether the file is created correctly after calling | |
1788 | + ->create(), which means this approach doesn't work. | |
1789 | +D. | |
1790 | + - easy to implement. | |
1791 | + - the atomic behavaiour is lost. | |
1792 | + - to open a file with superuser's credential and give it to a user | |
1793 | + process is a bad idea, since the file object keeps the credential | |
1794 | + in it. It may affect LSM or something. This approach doesn't work | |
1795 | + either. | |
1796 | + | |
1797 | +The approach A is ideal, but it hard to implement. So here is a | |
1798 | +variation of A, which is to be implemented. | |
1799 | + | |
1800 | +A-1. Introduce aufs_atomic_open() | |
1801 | + - calls branch fs ->atomic_open() if exists. otherwise calls | |
1802 | + vfs_create() and finish_open(). | |
1803 | + - the demerit is that the several checks after branch fs | |
1804 | + ->atomic_open() are lost. in the ordinary case, the checks are | |
1805 | + done by VFS:do_last(), lookup_open() and atomic_open(). some can | |
1806 | + be implemented in aufs, but not all I am afraid. | |
53392da6 AM |
1807 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt linux/Documentation/filesystems/aufs/design/03lookup.txt |
1808 | --- /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1809 | +++ linux/Documentation/filesystems/aufs/design/03lookup.txt 2018-04-15 08:49:13.394483860 +0200 |
7e9cd9fe | 1810 | @@ -0,0 +1,113 @@ |
53392da6 | 1811 | + |
b00004a5 | 1812 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
1813 | +# |
1814 | +# This program is free software; you can redistribute it and/or modify | |
1815 | +# it under the terms of the GNU General Public License as published by | |
1816 | +# the Free Software Foundation; either version 2 of the License, or | |
1817 | +# (at your option) any later version. | |
1818 | +# | |
1819 | +# This program is distributed in the hope that it will be useful, | |
1820 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1821 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1822 | +# GNU General Public License for more details. | |
1823 | +# | |
1824 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1825 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1826 | + |
1827 | +Lookup in a Branch | |
1828 | +---------------------------------------------------------------------- | |
1829 | +Since aufs has a character of sub-VFS (see Introduction), it operates | |
7e9cd9fe AM |
1830 | +lookup for branches as VFS does. It may be a heavy work. But almost all |
1831 | +lookup operation in aufs is the simplest case, ie. lookup only an entry | |
1832 | +directly connected to its parent. Digging down the directory hierarchy | |
1833 | +is unnecessary. VFS has a function lookup_one_len() for that use, and | |
1834 | +aufs calls it. | |
1835 | + | |
1836 | +When a branch is a remote filesystem, aufs basically relies upon its | |
53392da6 AM |
1837 | +->d_revalidate(), also aufs forces the hardest revalidate tests for |
1838 | +them. | |
1839 | +For d_revalidate, aufs implements three levels of revalidate tests. See | |
1840 | +"Revalidate Dentry and UDBA" in detail. | |
1841 | + | |
1842 | + | |
076b876e AM |
1843 | +Test Only the Highest One for the Directory Permission (dirperm1 option) |
1844 | +---------------------------------------------------------------------- | |
1845 | +Let's try case study. | |
1846 | +- aufs has two branches, upper readwrite and lower readonly. | |
1847 | + /au = /rw + /ro | |
1848 | +- "dirA" exists under /ro, but /rw. and its mode is 0700. | |
1849 | +- user invoked "chmod a+rx /au/dirA" | |
1850 | +- the internal copy-up is activated and "/rw/dirA" is created and its | |
7e9cd9fe | 1851 | + permission bits are set to world readable. |
076b876e AM |
1852 | +- then "/au/dirA" becomes world readable? |
1853 | + | |
1854 | +In this case, /ro/dirA is still 0700 since it exists in readonly branch, | |
1855 | +or it may be a natively readonly filesystem. If aufs respects the lower | |
1856 | +branch, it should not respond readdir request from other users. But user | |
1857 | +allowed it by chmod. Should really aufs rejects showing the entries | |
1858 | +under /ro/dirA? | |
1859 | + | |
7e9cd9fe AM |
1860 | +To be honest, I don't have a good solution for this case. So aufs |
1861 | +implements 'dirperm1' and 'nodirperm1' mount options, and leave it to | |
1862 | +users. | |
076b876e AM |
1863 | +When dirperm1 is specified, aufs checks only the highest one for the |
1864 | +directory permission, and shows the entries. Otherwise, as usual, checks | |
1865 | +every dir existing on all branches and rejects the request. | |
1866 | + | |
1867 | +As a side effect, dirperm1 option improves the performance of aufs | |
1868 | +because the number of permission check is reduced when the number of | |
1869 | +branch is many. | |
1870 | + | |
1871 | + | |
53392da6 AM |
1872 | +Revalidate Dentry and UDBA (User's Direct Branch Access) |
1873 | +---------------------------------------------------------------------- | |
1874 | +Generally VFS helpers re-validate a dentry as a part of lookup. | |
1875 | +0. digging down the directory hierarchy. | |
1876 | +1. lock the parent dir by its i_mutex. | |
1877 | +2. lookup the final (child) entry. | |
1878 | +3. revalidate it. | |
1879 | +4. call the actual operation (create, unlink, etc.) | |
1880 | +5. unlock the parent dir | |
1881 | + | |
1882 | +If the filesystem implements its ->d_revalidate() (step 3), then it is | |
1883 | +called. Actually aufs implements it and checks the dentry on a branch is | |
1884 | +still valid. | |
1885 | +But it is not enough. Because aufs has to release the lock for the | |
1886 | +parent dir on a branch at the end of ->lookup() (step 2) and | |
1887 | +->d_revalidate() (step 3) while the i_mutex of the aufs dir is still | |
1888 | +held by VFS. | |
1889 | +If the file on a branch is changed directly, eg. bypassing aufs, after | |
1890 | +aufs released the lock, then the subsequent operation may cause | |
1891 | +something unpleasant result. | |
1892 | + | |
1893 | +This situation is a result of VFS architecture, ->lookup() and | |
1894 | +->d_revalidate() is separated. But I never say it is wrong. It is a good | |
1895 | +design from VFS's point of view. It is just not suitable for sub-VFS | |
1896 | +character in aufs. | |
1897 | + | |
1898 | +Aufs supports such case by three level of revalidation which is | |
1899 | +selectable by user. | |
1900 | +1. Simple Revalidate | |
1901 | + Addition to the native flow in VFS's, confirm the child-parent | |
1902 | + relationship on the branch just after locking the parent dir on the | |
1903 | + branch in the "actual operation" (step 4). When this validation | |
1904 | + fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still | |
1905 | + checks the validation of the dentry on branches. | |
1906 | +2. Monitor Changes Internally by Inotify/Fsnotify | |
1907 | + Addition to above, in the "actual operation" (step 4) aufs re-lookup | |
1908 | + the dentry on the branch, and returns EBUSY if it finds different | |
1909 | + dentry. | |
1910 | + Additionally, aufs sets the inotify/fsnotify watch for every dir on branches | |
1911 | + during it is in cache. When the event is notified, aufs registers a | |
1912 | + function to kernel 'events' thread by schedule_work(). And the | |
1913 | + function sets some special status to the cached aufs dentry and inode | |
1914 | + private data. If they are not cached, then aufs has nothing to | |
1915 | + do. When the same file is accessed through aufs (step 0-3) later, | |
1916 | + aufs will detect the status and refresh all necessary data. | |
1917 | + In this mode, aufs has to ignore the event which is fired by aufs | |
1918 | + itself. | |
1919 | +3. No Extra Validation | |
1920 | + This is the simplest test and doesn't add any additional revalidation | |
7e9cd9fe | 1921 | + test, and skip the revalidation in step 4. It is useful and improves |
53392da6 AM |
1922 | + aufs performance when system surely hide the aufs branches from user, |
1923 | + by over-mounting something (or another method). | |
1924 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt linux/Documentation/filesystems/aufs/design/04branch.txt | |
1925 | --- /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 1926 | +++ linux/Documentation/filesystems/aufs/design/04branch.txt 2018-04-15 08:49:13.394483860 +0200 |
7e9cd9fe | 1927 | @@ -0,0 +1,74 @@ |
53392da6 | 1928 | + |
b00004a5 | 1929 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
1930 | +# |
1931 | +# This program is free software; you can redistribute it and/or modify | |
1932 | +# it under the terms of the GNU General Public License as published by | |
1933 | +# the Free Software Foundation; either version 2 of the License, or | |
1934 | +# (at your option) any later version. | |
1935 | +# | |
1936 | +# This program is distributed in the hope that it will be useful, | |
1937 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1938 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1939 | +# GNU General Public License for more details. | |
1940 | +# | |
1941 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 1942 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
1943 | + |
1944 | +Branch Manipulation | |
1945 | + | |
1946 | +Since aufs supports dynamic branch manipulation, ie. add/remove a branch | |
1947 | +and changing its permission/attribute, there are a lot of works to do. | |
1948 | + | |
1949 | + | |
1950 | +Add a Branch | |
1951 | +---------------------------------------------------------------------- | |
1952 | +o Confirm the adding dir exists outside of aufs, including loopback | |
7e9cd9fe | 1953 | + mount, and its various attributes. |
53392da6 AM |
1954 | +o Initialize the xino file and whiteout bases if necessary. |
1955 | + See struct.txt. | |
1956 | + | |
1957 | +o Check the owner/group/mode of the directory | |
1958 | + When the owner/group/mode of the adding directory differs from the | |
1959 | + existing branch, aufs issues a warning because it may impose a | |
1960 | + security risk. | |
1961 | + For example, when a upper writable branch has a world writable empty | |
1962 | + top directory, a malicious user can create any files on the writable | |
1963 | + branch directly, like copy-up and modify manually. If something like | |
1964 | + /etc/{passwd,shadow} exists on the lower readonly branch but the upper | |
1965 | + writable branch, and the writable branch is world-writable, then a | |
1966 | + malicious guy may create /etc/passwd on the writable branch directly | |
1967 | + and the infected file will be valid in aufs. | |
7e9cd9fe | 1968 | + I am afraid it can be a security issue, but aufs can do nothing except |
53392da6 AM |
1969 | + producing a warning. |
1970 | + | |
1971 | + | |
1972 | +Delete a Branch | |
1973 | +---------------------------------------------------------------------- | |
1974 | +o Confirm the deleting branch is not busy | |
1975 | + To be general, there is one merit to adopt "remount" interface to | |
1976 | + manipulate branches. It is to discard caches. At deleting a branch, | |
1977 | + aufs checks the still cached (and connected) dentries and inodes. If | |
1978 | + there are any, then they are all in-use. An inode without its | |
1979 | + corresponding dentry can be alive alone (for example, inotify/fsnotify case). | |
1980 | + | |
1981 | + For the cached one, aufs checks whether the same named entry exists on | |
1982 | + other branches. | |
1983 | + If the cached one is a directory, because aufs provides a merged view | |
1984 | + to users, as long as one dir is left on any branch aufs can show the | |
1985 | + dir to users. In this case, the branch can be removed from aufs. | |
1986 | + Otherwise aufs rejects deleting the branch. | |
1987 | + | |
1988 | + If any file on the deleting branch is opened by aufs, then aufs | |
1989 | + rejects deleting. | |
1990 | + | |
1991 | + | |
1992 | +Modify the Permission of a Branch | |
1993 | +---------------------------------------------------------------------- | |
1994 | +o Re-initialize or remove the xino file and whiteout bases if necessary. | |
1995 | + See struct.txt. | |
1996 | + | |
1997 | +o rw --> ro: Confirm the modifying branch is not busy | |
1998 | + Aufs rejects the request if any of these conditions are true. | |
1999 | + - a file on the branch is mmap-ed. | |
2000 | + - a regular file on the branch is opened for write and there is no | |
2001 | + same named entry on the upper branch. | |
2002 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt linux/Documentation/filesystems/aufs/design/05wbr_policy.txt | |
2003 | --- /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2004 | +++ linux/Documentation/filesystems/aufs/design/05wbr_policy.txt 2018-04-15 08:49:13.394483860 +0200 |
523b37e3 | 2005 | @@ -0,0 +1,64 @@ |
53392da6 | 2006 | + |
b00004a5 | 2007 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
2008 | +# |
2009 | +# This program is free software; you can redistribute it and/or modify | |
2010 | +# it under the terms of the GNU General Public License as published by | |
2011 | +# the Free Software Foundation; either version 2 of the License, or | |
2012 | +# (at your option) any later version. | |
2013 | +# | |
2014 | +# This program is distributed in the hope that it will be useful, | |
2015 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2016 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2017 | +# GNU General Public License for more details. | |
2018 | +# | |
2019 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2020 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2021 | + |
2022 | +Policies to Select One among Multiple Writable Branches | |
2023 | +---------------------------------------------------------------------- | |
2024 | +When the number of writable branch is more than one, aufs has to decide | |
2025 | +the target branch for file creation or copy-up. By default, the highest | |
2026 | +writable branch which has the parent (or ancestor) dir of the target | |
2027 | +file is chosen (top-down-parent policy). | |
2028 | +By user's request, aufs implements some other policies to select the | |
7e9cd9fe AM |
2029 | +writable branch, for file creation several policies, round-robin, |
2030 | +most-free-space, and other policies. For copy-up, top-down-parent, | |
2031 | +bottom-up-parent, bottom-up and others. | |
53392da6 AM |
2032 | + |
2033 | +As expected, the round-robin policy selects the branch in circular. When | |
2034 | +you have two writable branches and creates 10 new files, 5 files will be | |
2035 | +created for each branch. mkdir(2) systemcall is an exception. When you | |
2036 | +create 10 new directories, all will be created on the same branch. | |
2037 | +And the most-free-space policy selects the one which has most free | |
2038 | +space among the writable branches. The amount of free space will be | |
2039 | +checked by aufs internally, and users can specify its time interval. | |
2040 | + | |
2041 | +The policies for copy-up is more simple, | |
2042 | +top-down-parent is equivalent to the same named on in create policy, | |
2043 | +bottom-up-parent selects the writable branch where the parent dir | |
2044 | +exists and the nearest upper one from the copyup-source, | |
2045 | +bottom-up selects the nearest upper writable branch from the | |
2046 | +copyup-source, regardless the existence of the parent dir. | |
2047 | + | |
2048 | +There are some rules or exceptions to apply these policies. | |
2049 | +- If there is a readonly branch above the policy-selected branch and | |
2050 | + the parent dir is marked as opaque (a variation of whiteout), or the | |
2051 | + target (creating) file is whiteout-ed on the upper readonly branch, | |
2052 | + then the result of the policy is ignored and the target file will be | |
2053 | + created on the nearest upper writable branch than the readonly branch. | |
2054 | +- If there is a writable branch above the policy-selected branch and | |
2055 | + the parent dir is marked as opaque or the target file is whiteouted | |
2056 | + on the branch, then the result of the policy is ignored and the target | |
2057 | + file will be created on the highest one among the upper writable | |
2058 | + branches who has diropq or whiteout. In case of whiteout, aufs removes | |
2059 | + it as usual. | |
2060 | +- link(2) and rename(2) systemcalls are exceptions in every policy. | |
2061 | + They try selecting the branch where the source exists as possible | |
2062 | + since copyup a large file will take long time. If it can't be, | |
2063 | + ie. the branch where the source exists is readonly, then they will | |
2064 | + follow the copyup policy. | |
2065 | +- There is an exception for rename(2) when the target exists. | |
2066 | + If the rename target exists, aufs compares the index of the branches | |
2067 | + where the source and the target exists and selects the higher | |
2068 | + one. If the selected branch is readonly, then aufs follows the | |
2069 | + copyup policy. | |
8b6a4947 AM |
2070 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.dot linux/Documentation/filesystems/aufs/design/06dirren.dot |
2071 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.dot 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2072 | +++ linux/Documentation/filesystems/aufs/design/06dirren.dot 2018-04-15 08:49:13.394483860 +0200 |
8b6a4947 AM |
2073 | @@ -0,0 +1,31 @@ |
2074 | + | |
2075 | +// to view this graph, run dot(1) command in GRAPHVIZ. | |
2076 | + | |
2077 | +digraph G { | |
2078 | +node [shape=box]; | |
2079 | +whinfo [label="detailed info file\n(lower_brid_root-hinum, h_inum, namelen, old name)"]; | |
2080 | + | |
2081 | +node [shape=oval]; | |
2082 | + | |
2083 | +aufs_rename -> whinfo [label="store/remove"]; | |
2084 | + | |
2085 | +node [shape=oval]; | |
2086 | +inode_list [label="h_inum list in branch\ncache"]; | |
2087 | + | |
2088 | +node [shape=box]; | |
2089 | +whinode [label="h_inum list file"]; | |
2090 | + | |
2091 | +node [shape=oval]; | |
2092 | +brmgmt [label="br_add/del/mod/umount"]; | |
2093 | + | |
2094 | +brmgmt -> inode_list [label="create/remove"]; | |
2095 | +brmgmt -> whinode [label="load/store"]; | |
2096 | + | |
2097 | +inode_list -> whinode [style=dashed,dir=both]; | |
2098 | + | |
2099 | +aufs_rename -> inode_list [label="add/del"]; | |
2100 | + | |
2101 | +aufs_lookup -> inode_list [label="search"]; | |
2102 | + | |
2103 | +aufs_lookup -> whinfo [label="load/remove"]; | |
2104 | +} | |
2105 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.txt linux/Documentation/filesystems/aufs/design/06dirren.txt | |
2106 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06dirren.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2107 | +++ linux/Documentation/filesystems/aufs/design/06dirren.txt 2018-04-15 08:49:13.394483860 +0200 |
8b6a4947 AM |
2108 | @@ -0,0 +1,102 @@ |
2109 | + | |
b00004a5 | 2110 | +# Copyright (C) 2017-2018 Junjiro R. Okajima |
8b6a4947 AM |
2111 | +# |
2112 | +# This program is free software; you can redistribute it and/or modify | |
2113 | +# it under the terms of the GNU General Public License as published by | |
2114 | +# the Free Software Foundation; either version 2 of the License, or | |
2115 | +# (at your option) any later version. | |
2116 | +# | |
2117 | +# This program is distributed in the hope that it will be useful, | |
2118 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2119 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2120 | +# GNU General Public License for more details. | |
2121 | +# | |
2122 | +# You should have received a copy of the GNU General Public License | |
2123 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. | |
2124 | + | |
2125 | +Special handling for renaming a directory (DIRREN) | |
2126 | +---------------------------------------------------------------------- | |
2127 | +First, let's assume we have a simple usecase. | |
2128 | + | |
2129 | +- /u = /rw + /ro | |
2130 | +- /rw/dirA exists | |
2131 | +- /ro/dirA and /ro/dirA/file exist too | |
2132 | +- there is no dirB on both branches | |
2133 | +- a user issues rename("dirA", "dirB") | |
2134 | + | |
2135 | +Now, what should aufs behave against this rename(2)? | |
2136 | +There are a few possible cases. | |
2137 | + | |
2138 | +A. returns EROFS. | |
2139 | + since dirA exists on a readonly branch which cannot be renamed. | |
2140 | +B. returns EXDEV. | |
2141 | + it is possible to copy-up dirA (only the dir itself), but the child | |
2142 | + entries ("file" in this case) should not be. it must be a bad | |
2143 | + approach to copy-up recursively. | |
2144 | +C. returns a success. | |
2145 | + even the branch /ro is readonly, aufs tries renaming it. Obviously it | |
2146 | + is a violation of aufs' policy. | |
2147 | +D. construct an extra information which indicates that /ro/dirA should | |
2148 | + be handled as the name of dirB. | |
2149 | + overlayfs has a similar feature called REDIRECT. | |
2150 | + | |
2151 | +Until now, aufs implements the case B only which returns EXDEV, and | |
2152 | +expects the userspace application behaves like mv(1) which tries | |
2153 | +issueing rename(2) recursively. | |
2154 | + | |
2155 | +A new aufs feature called DIRREN is introduced which implements the case | |
2156 | +D. There are several "extra information" added. | |
2157 | + | |
2158 | +1. detailed info per renamed directory | |
2159 | + path: /rw/dirB/$AUFS_WH_DR_INFO_PFX.<lower branch-id> | |
2160 | +2. the inode-number list of directories on a branch | |
2161 | + path: /rw/dirB/$AUFS_WH_DR_BRHINO | |
2162 | + | |
2163 | +The filename of "detailed info per directory" represents the lower | |
2164 | +branch, and its format is | |
2165 | +- a type of the branch id | |
2166 | + one of these. | |
2167 | + + uuid (not implemented yet) | |
2168 | + + fsid | |
2169 | + + dev | |
2170 | +- the inode-number of the branch root dir | |
2171 | + | |
2172 | +And it contains these info in a single regular file. | |
2173 | +- magic number | |
2174 | +- branch's inode-number of the logically renamed dir | |
2175 | +- the name of the before-renamed dir | |
2176 | + | |
2177 | +The "detailed info per directory" file is created in aufs rename(2), and | |
2178 | +loaded in any lookup. | |
2179 | +The info is considered in lookup for the matching case only. Here | |
2180 | +"matching" means that the root of branch (in the info filename) is same | |
2181 | +to the current looking-up branch. After looking-up the before-renamed | |
2182 | +name, the inode-number is compared. And the matched dentry is used. | |
2183 | + | |
2184 | +The "inode-number list of directories" is a regular file which contains | |
2185 | +simply the inode-numbers on the branch. The file is created or updated | |
2186 | +in removing the branch, and loaded in adding the branch. Its lifetime is | |
2187 | +equal to the branch. | |
2188 | +The list is refered in lookup, and when the current target inode is | |
2189 | +found in the list, the aufs tries loading the "detailed info per | |
2190 | +directory" and get the changed and valid name of the dir. | |
2191 | + | |
2192 | +Theoretically these "extra informaiton" may be able to be put into XATTR | |
2193 | +in the dir inode. But aufs doesn't choose this way because | |
2194 | +1. XATTR may not be supported by the branch (or its configuration) | |
2195 | +2. XATTR may have its size limit. | |
2196 | +3. XATTR may be less easy to convert than a regular file, when the | |
2197 | + format of the info is changed in the future. | |
2198 | +At the same time, I agree that the regular file approach is much slower | |
2199 | +than XATTR approach. So, in the future, aufs may take the XATTR or other | |
2200 | +better approach. | |
2201 | + | |
2202 | +This DIRREN feature is enabled by aufs configuration, and is activated | |
2203 | +by a new mount option. | |
2204 | + | |
2205 | +For the more complicated case, there is a work with UDBA option, which | |
2206 | +is to dected the direct access to the branches (by-passing aufs) and to | |
2207 | +maintain the cashes in aufs. Since a single cached aufs dentry may | |
2208 | +contains two names, before- and after-rename, the name comparision in | |
2209 | +UDBA handler may not work correctly. In this case, the behaviour will be | |
2210 | +equivalen to udba=reval case. | |
076b876e AM |
2211 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06fhsm.txt linux/Documentation/filesystems/aufs/design/06fhsm.txt |
2212 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06fhsm.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2213 | +++ linux/Documentation/filesystems/aufs/design/06fhsm.txt 2018-04-15 08:49:13.394483860 +0200 |
076b876e AM |
2214 | @@ -0,0 +1,120 @@ |
2215 | + | |
b00004a5 | 2216 | +# Copyright (C) 2011-2018 Junjiro R. Okajima |
076b876e AM |
2217 | +# |
2218 | +# This program is free software; you can redistribute it and/or modify | |
2219 | +# it under the terms of the GNU General Public License as published by | |
2220 | +# the Free Software Foundation; either version 2 of the License, or | |
2221 | +# (at your option) any later version. | |
2222 | +# | |
2223 | +# This program is distributed in the hope that it will be useful, | |
2224 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2225 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2226 | +# GNU General Public License for more details. | |
2227 | +# | |
2228 | +# You should have received a copy of the GNU General Public License | |
2229 | +# along with this program; if not, write to the Free Software | |
2230 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2231 | + | |
2232 | + | |
2233 | +File-based Hierarchical Storage Management (FHSM) | |
2234 | +---------------------------------------------------------------------- | |
2235 | +Hierarchical Storage Management (or HSM) is a well-known feature in the | |
2236 | +storage world. Aufs provides this feature as file-based with multiple | |
7e9cd9fe | 2237 | +writable branches, based upon the principle of "Colder, the Lower". |
076b876e | 2238 | +Here the word "colder" means that the less used files, and "lower" means |
7e9cd9fe | 2239 | +that the position in the order of the stacked branches vertically. |
076b876e AM |
2240 | +These multiple writable branches are prioritized, ie. the topmost one |
2241 | +should be the fastest drive and be used heavily. | |
2242 | + | |
2243 | +o Characters in aufs FHSM story | |
2244 | +- aufs itself and a new branch attribute. | |
2245 | +- a new ioctl interface to move-down and to establish a connection with | |
2246 | + the daemon ("move-down" is a converse of "copy-up"). | |
2247 | +- userspace tool and daemon. | |
2248 | + | |
2249 | +The userspace daemon establishes a connection with aufs and waits for | |
2250 | +the notification. The notified information is very similar to struct | |
2251 | +statfs containing the number of consumed blocks and inodes. | |
2252 | +When the consumed blocks/inodes of a branch exceeds the user-specified | |
2253 | +upper watermark, the daemon activates its move-down process until the | |
2254 | +consumed blocks/inodes reaches the user-specified lower watermark. | |
2255 | + | |
2256 | +The actual move-down is done by aufs based upon the request from | |
2257 | +user-space since we need to maintain the inode number and the internal | |
2258 | +pointer arrays in aufs. | |
2259 | + | |
2260 | +Currently aufs FHSM handles the regular files only. Additionally they | |
2261 | +must not be hard-linked nor pseudo-linked. | |
2262 | + | |
2263 | + | |
2264 | +o Cowork of aufs and the user-space daemon | |
2265 | + During the userspace daemon established the connection, aufs sends a | |
2266 | + small notification to it whenever aufs writes something into the | |
2267 | + writable branch. But it may cost high since aufs issues statfs(2) | |
2268 | + internally. So user can specify a new option to cache the | |
2269 | + info. Actually the notification is controlled by these factors. | |
2270 | + + the specified cache time. | |
2271 | + + classified as "force" by aufs internally. | |
2272 | + Until the specified time expires, aufs doesn't send the info | |
2273 | + except the forced cases. When aufs decide forcing, the info is always | |
2274 | + notified to userspace. | |
2275 | + For example, the number of free inodes is generally large enough and | |
2276 | + the shortage of it happens rarely. So aufs doesn't force the | |
2277 | + notification when creating a new file, directory and others. This is | |
2278 | + the typical case which aufs doesn't force. | |
2279 | + When aufs writes the actual filedata and the files consumes any of new | |
2280 | + blocks, the aufs forces notifying. | |
2281 | + | |
2282 | + | |
2283 | +o Interfaces in aufs | |
2284 | +- New branch attribute. | |
2285 | + + fhsm | |
2286 | + Specifies that the branch is managed by FHSM feature. In other word, | |
2287 | + participant in the FHSM. | |
2288 | + When nofhsm is set to the branch, it will not be the source/target | |
2289 | + branch of the move-down operation. This attribute is set | |
2290 | + independently from coo and moo attributes, and if you want full | |
2291 | + FHSM, you should specify them as well. | |
2292 | +- New mount option. | |
2293 | + + fhsm_sec | |
2294 | + Specifies a second to suppress many less important info to be | |
2295 | + notified. | |
2296 | +- New ioctl. | |
2297 | + + AUFS_CTL_FHSM_FD | |
2298 | + create a new file descriptor which userspace can read the notification | |
2299 | + (a subset of struct statfs) from aufs. | |
2300 | +- Module parameter 'brs' | |
2301 | + It has to be set to 1. Otherwise the new mount option 'fhsm' will not | |
2302 | + be set. | |
2303 | +- mount helpers /sbin/mount.aufs and /sbin/umount.aufs | |
2304 | + When there are two or more branches with fhsm attributes, | |
2305 | + /sbin/mount.aufs invokes the user-space daemon and /sbin/umount.aufs | |
2306 | + terminates it. As a result of remounting and branch-manipulation, the | |
2307 | + number of branches with fhsm attribute can be one. In this case, | |
2308 | + /sbin/mount.aufs will terminate the user-space daemon. | |
2309 | + | |
2310 | + | |
2311 | +Finally the operation is done as these steps in kernel-space. | |
2312 | +- make sure that, | |
2313 | + + no one else is using the file. | |
2314 | + + the file is not hard-linked. | |
2315 | + + the file is not pseudo-linked. | |
2316 | + + the file is a regular file. | |
2317 | + + the parent dir is not opaqued. | |
2318 | +- find the target writable branch. | |
2319 | +- make sure the file is not whiteout-ed by the upper (than the target) | |
2320 | + branch. | |
2321 | +- make the parent dir on the target branch. | |
2322 | +- mutex lock the inode on the branch. | |
2323 | +- unlink the whiteout on the target branch (if exists). | |
2324 | +- lookup and create the whiteout-ed temporary name on the target branch. | |
2325 | +- copy the file as the whiteout-ed temporary name on the target branch. | |
2326 | +- rename the whiteout-ed temporary name to the original name. | |
2327 | +- unlink the file on the source branch. | |
2328 | +- maintain the internal pointer array and the external inode number | |
2329 | + table (XINO). | |
2330 | +- maintain the timestamps and other attributes of the parent dir and the | |
2331 | + file. | |
2332 | + | |
2333 | +And of course, in every step, an error may happen. So the operation | |
2334 | +should restore the original file state after an error happens. | |
53392da6 AM |
2335 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt linux/Documentation/filesystems/aufs/design/06mmap.txt |
2336 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2337 | +++ linux/Documentation/filesystems/aufs/design/06mmap.txt 2018-04-15 08:49:13.394483860 +0200 |
b912730e | 2338 | @@ -0,0 +1,72 @@ |
53392da6 | 2339 | + |
b00004a5 | 2340 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
2341 | +# |
2342 | +# This program is free software; you can redistribute it and/or modify | |
2343 | +# it under the terms of the GNU General Public License as published by | |
2344 | +# the Free Software Foundation; either version 2 of the License, or | |
2345 | +# (at your option) any later version. | |
2346 | +# | |
2347 | +# This program is distributed in the hope that it will be useful, | |
2348 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2349 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2350 | +# GNU General Public License for more details. | |
2351 | +# | |
2352 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2353 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2354 | + |
2355 | +mmap(2) -- File Memory Mapping | |
2356 | +---------------------------------------------------------------------- | |
2357 | +In aufs, the file-mapped pages are handled by a branch fs directly, no | |
2358 | +interaction with aufs. It means aufs_mmap() calls the branch fs's | |
2359 | +->mmap(). | |
2360 | +This approach is simple and good, but there is one problem. | |
7e9cd9fe | 2361 | +Under /proc, several entries show the mmapped files by its path (with |
53392da6 AM |
2362 | +device and inode number), and the printed path will be the path on the |
2363 | +branch fs's instead of virtual aufs's. | |
2364 | +This is not a problem in most cases, but some utilities lsof(1) (and its | |
2365 | +user) may expect the path on aufs. | |
2366 | + | |
2367 | +To address this issue, aufs adds a new member called vm_prfile in struct | |
2368 | +vm_area_struct (and struct vm_region). The original vm_file points to | |
2369 | +the file on the branch fs in order to handle everything correctly as | |
2370 | +usual. The new vm_prfile points to a virtual file in aufs, and the | |
2371 | +show-functions in procfs refers to vm_prfile if it is set. | |
2372 | +Also we need to maintain several other places where touching vm_file | |
2373 | +such like | |
2374 | +- fork()/clone() copies vma and the reference count of vm_file is | |
2375 | + incremented. | |
2376 | +- merging vma maintains the ref count too. | |
2377 | + | |
7e9cd9fe | 2378 | +This is not a good approach. It just fakes the printed path. But it |
53392da6 AM |
2379 | +leaves all behaviour around f_mapping unchanged. This is surely an |
2380 | +advantage. | |
2381 | +Actually aufs had adopted another complicated approach which calls | |
2382 | +generic_file_mmap() and handles struct vm_operations_struct. In this | |
2383 | +approach, aufs met a hard problem and I could not solve it without | |
2384 | +switching the approach. | |
b912730e AM |
2385 | + |
2386 | +There may be one more another approach which is | |
2387 | +- bind-mount the branch-root onto the aufs-root internally | |
2388 | +- grab the new vfsmount (ie. struct mount) | |
2389 | +- lazy-umount the branch-root internally | |
2390 | +- in open(2) the aufs-file, open the branch-file with the hidden | |
2391 | + vfsmount (instead of the original branch's vfsmount) | |
2392 | +- ideally this "bind-mount and lazy-umount" should be done atomically, | |
2393 | + but it may be possible from userspace by the mount helper. | |
2394 | + | |
2395 | +Adding the internal hidden vfsmount and using it in opening a file, the | |
2396 | +file path under /proc will be printed correctly. This approach looks | |
2397 | +smarter, but is not possible I am afraid. | |
2398 | +- aufs-root may be bind-mount later. when it happens, another hidden | |
2399 | + vfsmount will be required. | |
2400 | +- it is hard to get the chance to bind-mount and lazy-umount | |
2401 | + + in kernel-space, FS can have vfsmount in open(2) via | |
2402 | + file->f_path, and aufs can know its vfsmount. But several locks are | |
2403 | + already acquired, and if aufs tries to bind-mount and lazy-umount | |
2404 | + here, then it may cause a deadlock. | |
2405 | + + in user-space, bind-mount doesn't invoke the mount helper. | |
2406 | +- since /proc shows dev and ino, aufs has to give vma these info. it | |
2407 | + means a new member vm_prinode will be necessary. this is essentially | |
2408 | + equivalent to vm_prfile described above. | |
2409 | + | |
2410 | +I have to give up this "looks-smater" approach. | |
c1595e42 JR |
2411 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06xattr.txt linux/Documentation/filesystems/aufs/design/06xattr.txt |
2412 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06xattr.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2413 | +++ linux/Documentation/filesystems/aufs/design/06xattr.txt 2018-04-15 08:49:13.394483860 +0200 |
c1595e42 JR |
2414 | @@ -0,0 +1,96 @@ |
2415 | + | |
b00004a5 | 2416 | +# Copyright (C) 2014-2018 Junjiro R. Okajima |
c1595e42 JR |
2417 | +# |
2418 | +# This program is free software; you can redistribute it and/or modify | |
2419 | +# it under the terms of the GNU General Public License as published by | |
2420 | +# the Free Software Foundation; either version 2 of the License, or | |
2421 | +# (at your option) any later version. | |
2422 | +# | |
2423 | +# This program is distributed in the hope that it will be useful, | |
2424 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2425 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2426 | +# GNU General Public License for more details. | |
2427 | +# | |
2428 | +# You should have received a copy of the GNU General Public License | |
2429 | +# along with this program; if not, write to the Free Software | |
2430 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
2431 | + | |
2432 | + | |
2433 | +Listing XATTR/EA and getting the value | |
2434 | +---------------------------------------------------------------------- | |
2435 | +For the inode standard attributes (owner, group, timestamps, etc.), aufs | |
2436 | +shows the values from the topmost existing file. This behaviour is good | |
7e9cd9fe | 2437 | +for the non-dir entries since the bahaviour exactly matches the shown |
c1595e42 JR |
2438 | +information. But for the directories, aufs considers all the same named |
2439 | +entries on the lower branches. Which means, if one of the lower entry | |
2440 | +rejects readdir call, then aufs returns an error even if the topmost | |
2441 | +entry allows it. This behaviour is necessary to respect the branch fs's | |
2442 | +security, but can make users confused since the user-visible standard | |
2443 | +attributes don't match the behaviour. | |
2444 | +To address this issue, aufs has a mount option called dirperm1 which | |
2445 | +checks the permission for the topmost entry only, and ignores the lower | |
2446 | +entry's permission. | |
2447 | + | |
2448 | +A similar issue can happen around XATTR. | |
2449 | +getxattr(2) and listxattr(2) families behave as if dirperm1 option is | |
7e9cd9fe AM |
2450 | +always set. Otherwise these very unpleasant situation would happen. |
2451 | +- listxattr(2) may return the duplicated entries. | |
c1595e42 JR |
2452 | +- users may not be able to remove or reset the XATTR forever, |
2453 | + | |
2454 | + | |
2455 | +XATTR/EA support in the internal (copy,move)-(up,down) | |
2456 | +---------------------------------------------------------------------- | |
7e9cd9fe | 2457 | +Generally the extended attributes of inode are categorized as these. |
c1595e42 JR |
2458 | +- "security" for LSM and capability. |
2459 | +- "system" for posix ACL, 'acl' mount option is required for the branch | |
2460 | + fs generally. | |
2461 | +- "trusted" for userspace, CAP_SYS_ADMIN is required. | |
2462 | +- "user" for userspace, 'user_xattr' mount option is required for the | |
2463 | + branch fs generally. | |
2464 | + | |
2465 | +Moreover there are some other categories. Aufs handles these rather | |
2466 | +unpopular categories as the ordinary ones, ie. there is no special | |
2467 | +condition nor exception. | |
2468 | + | |
2469 | +In copy-up, the support for XATTR on the dst branch may differ from the | |
2470 | +src branch. In this case, the copy-up operation will get an error and | |
7e9cd9fe AM |
2471 | +the original user operation which triggered the copy-up will fail. It |
2472 | +can happen that even all copy-up will fail. | |
c1595e42 JR |
2473 | +When both of src and dst branches support XATTR and if an error occurs |
2474 | +during copying XATTR, then the copy-up should fail obviously. That is a | |
2475 | +good reason and aufs should return an error to userspace. But when only | |
7e9cd9fe | 2476 | +the src branch support that XATTR, aufs should not return an error. |
c1595e42 JR |
2477 | +For example, the src branch supports ACL but the dst branch doesn't |
2478 | +because the dst branch may natively un-support it or temporary | |
2479 | +un-support it due to "noacl" mount option. Of course, the dst branch fs | |
2480 | +may NOT return an error even if the XATTR is not supported. It is | |
2481 | +totally up to the branch fs. | |
2482 | + | |
2483 | +Anyway when the aufs internal copy-up gets an error from the dst branch | |
2484 | +fs, then aufs tries removing the just copied entry and returns the error | |
2485 | +to the userspace. The worst case of this situation will be all copy-up | |
2486 | +will fail. | |
2487 | + | |
2488 | +For the copy-up operation, there two basic approaches. | |
2489 | +- copy the specified XATTR only (by category above), and return the | |
7e9cd9fe | 2490 | + error unconditionally if it happens. |
c1595e42 JR |
2491 | +- copy all XATTR, and ignore the error on the specified category only. |
2492 | + | |
2493 | +In order to support XATTR and to implement the correct behaviour, aufs | |
7e9cd9fe AM |
2494 | +chooses the latter approach and introduces some new branch attributes, |
2495 | +"icexsec", "icexsys", "icextr", "icexusr", and "icexoth". | |
c1595e42 | 2496 | +They correspond to the XATTR namespaces (see above). Additionally, to be |
7e9cd9fe AM |
2497 | +convenient, "icex" is also provided which means all "icex*" attributes |
2498 | +are set (here the word "icex" stands for "ignore copy-error on XATTR"). | |
c1595e42 JR |
2499 | + |
2500 | +The meaning of these attributes is to ignore the error from setting | |
2501 | +XATTR on that branch. | |
2502 | +Note that aufs tries copying all XATTR unconditionally, and ignores the | |
2503 | +error from the dst branch according to the specified attributes. | |
2504 | + | |
2505 | +Some XATTR may have its default value. The default value may come from | |
2506 | +the parent dir or the environment. If the default value is set at the | |
2507 | +file creating-time, it will be overwritten by copy-up. | |
2508 | +Some contradiction may happen I am afraid. | |
2509 | +Do we need another attribute to stop copying XATTR? I am unsure. For | |
2510 | +now, aufs implements the branch attributes to ignore the error. | |
53392da6 AM |
2511 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt linux/Documentation/filesystems/aufs/design/07export.txt |
2512 | --- /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2513 | +++ linux/Documentation/filesystems/aufs/design/07export.txt 2018-04-15 08:49:13.394483860 +0200 |
523b37e3 | 2514 | @@ -0,0 +1,58 @@ |
53392da6 | 2515 | + |
b00004a5 | 2516 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
2517 | +# |
2518 | +# This program is free software; you can redistribute it and/or modify | |
2519 | +# it under the terms of the GNU General Public License as published by | |
2520 | +# the Free Software Foundation; either version 2 of the License, or | |
2521 | +# (at your option) any later version. | |
2522 | +# | |
2523 | +# This program is distributed in the hope that it will be useful, | |
2524 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2525 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2526 | +# GNU General Public License for more details. | |
2527 | +# | |
2528 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2529 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2530 | + |
2531 | +Export Aufs via NFS | |
2532 | +---------------------------------------------------------------------- | |
2533 | +Here is an approach. | |
2534 | +- like xino/xib, add a new file 'xigen' which stores aufs inode | |
2535 | + generation. | |
2536 | +- iget_locked(): initialize aufs inode generation for a new inode, and | |
2537 | + store it in xigen file. | |
2538 | +- destroy_inode(): increment aufs inode generation and store it in xigen | |
2539 | + file. it is necessary even if it is not unlinked, because any data of | |
2540 | + inode may be changed by UDBA. | |
2541 | +- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise | |
2542 | + build file handle by | |
2543 | + + branch id (4 bytes) | |
2544 | + + superblock generation (4 bytes) | |
2545 | + + inode number (4 or 8 bytes) | |
2546 | + + parent dir inode number (4 or 8 bytes) | |
2547 | + + inode generation (4 bytes)) | |
2548 | + + return value of exportfs_encode_fh() for the parent on a branch (4 | |
2549 | + bytes) | |
2550 | + + file handle for a branch (by exportfs_encode_fh()) | |
2551 | +- fh_to_dentry(): | |
2552 | + + find the index of a branch from its id in handle, and check it is | |
2553 | + still exist in aufs. | |
2554 | + + 1st level: get the inode number from handle and search it in cache. | |
7e9cd9fe AM |
2555 | + + 2nd level: if not found in cache, get the parent inode number from |
2556 | + the handle and search it in cache. and then open the found parent | |
2557 | + dir, find the matching inode number by vfs_readdir() and get its | |
2558 | + name, and call lookup_one_len() for the target dentry. | |
53392da6 AM |
2559 | + + 3rd level: if the parent dir is not cached, call |
2560 | + exportfs_decode_fh() for a branch and get the parent on a branch, | |
2561 | + build a pathname of it, convert it a pathname in aufs, call | |
2562 | + path_lookup(). now aufs gets a parent dir dentry, then handle it as | |
2563 | + the 2nd level. | |
2564 | + + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount | |
2565 | + for every branch, but not itself. to get this, (currently) aufs | |
2566 | + searches in current->nsproxy->mnt_ns list. it may not be a good | |
2567 | + idea, but I didn't get other approach. | |
2568 | + + test the generation of the gotten inode. | |
2569 | +- every inode operation: they may get EBUSY due to UDBA. in this case, | |
2570 | + convert it into ESTALE for NFSD. | |
2571 | +- readdir(): call lockdep_on/off() because filldir in NFSD calls | |
2572 | + lookup_one_len(), vfs_getattr(), encode_fh() and others. | |
2573 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt linux/Documentation/filesystems/aufs/design/08shwh.txt | |
2574 | --- /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2575 | +++ linux/Documentation/filesystems/aufs/design/08shwh.txt 2018-04-15 08:49:13.394483860 +0200 |
523b37e3 | 2576 | @@ -0,0 +1,52 @@ |
53392da6 | 2577 | + |
b00004a5 | 2578 | +# Copyright (C) 2005-2018 Junjiro R. Okajima |
53392da6 AM |
2579 | +# |
2580 | +# This program is free software; you can redistribute it and/or modify | |
2581 | +# it under the terms of the GNU General Public License as published by | |
2582 | +# the Free Software Foundation; either version 2 of the License, or | |
2583 | +# (at your option) any later version. | |
2584 | +# | |
2585 | +# This program is distributed in the hope that it will be useful, | |
2586 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2587 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2588 | +# GNU General Public License for more details. | |
2589 | +# | |
2590 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2591 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2592 | + |
2593 | +Show Whiteout Mode (shwh) | |
2594 | +---------------------------------------------------------------------- | |
2595 | +Generally aufs hides the name of whiteouts. But in some cases, to show | |
2596 | +them is very useful for users. For instance, creating a new middle layer | |
2597 | +(branch) by merging existing layers. | |
2598 | + | |
2599 | +(borrowing aufs1 HOW-TO from a user, Michael Towers) | |
2600 | +When you have three branches, | |
2601 | +- Bottom: 'system', squashfs (underlying base system), read-only | |
2602 | +- Middle: 'mods', squashfs, read-only | |
2603 | +- Top: 'overlay', ram (tmpfs), read-write | |
2604 | + | |
2605 | +The top layer is loaded at boot time and saved at shutdown, to preserve | |
2606 | +the changes made to the system during the session. | |
2607 | +When larger changes have been made, or smaller changes have accumulated, | |
2608 | +the size of the saved top layer data grows. At this point, it would be | |
2609 | +nice to be able to merge the two overlay branches ('mods' and 'overlay') | |
2610 | +and rewrite the 'mods' squashfs, clearing the top layer and thus | |
2611 | +restoring save and load speed. | |
2612 | + | |
2613 | +This merging is simplified by the use of another aufs mount, of just the | |
2614 | +two overlay branches using the 'shwh' option. | |
2615 | +# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \ | |
2616 | + aufs /livesys/merge_union | |
2617 | + | |
2618 | +A merged view of these two branches is then available at | |
2619 | +/livesys/merge_union, and the new feature is that the whiteouts are | |
2620 | +visible! | |
2621 | +Note that in 'shwh' mode the aufs mount must be 'ro', which will disable | |
2622 | +writing to all branches. Also the default mode for all branches is 'ro'. | |
2623 | +It is now possible to save the combined contents of the two overlay | |
2624 | +branches to a new squashfs, e.g.: | |
2625 | +# mksquashfs /livesys/merge_union /path/to/newmods.squash | |
2626 | + | |
2627 | +This new squashfs archive can be stored on the boot device and the | |
2628 | +initramfs will use it to replace the old one at the next boot. | |
2629 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt linux/Documentation/filesystems/aufs/design/10dynop.txt | |
2630 | --- /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 2631 | +++ linux/Documentation/filesystems/aufs/design/10dynop.txt 2018-04-15 08:49:13.394483860 +0200 |
7e9cd9fe | 2632 | @@ -0,0 +1,47 @@ |
53392da6 | 2633 | + |
b00004a5 | 2634 | +# Copyright (C) 2010-2018 Junjiro R. Okajima |
53392da6 AM |
2635 | +# |
2636 | +# This program is free software; you can redistribute it and/or modify | |
2637 | +# it under the terms of the GNU General Public License as published by | |
2638 | +# the Free Software Foundation; either version 2 of the License, or | |
2639 | +# (at your option) any later version. | |
2640 | +# | |
2641 | +# This program is distributed in the hope that it will be useful, | |
2642 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2643 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2644 | +# GNU General Public License for more details. | |
2645 | +# | |
2646 | +# You should have received a copy of the GNU General Public License | |
523b37e3 | 2647 | +# along with this program. If not, see <http://www.gnu.org/licenses/>. |
53392da6 AM |
2648 | + |
2649 | +Dynamically customizable FS operations | |
2650 | +---------------------------------------------------------------------- | |
2651 | +Generally FS operations (struct inode_operations, struct | |
2652 | +address_space_operations, struct file_operations, etc.) are defined as | |
2653 | +"static const", but it never means that FS have only one set of | |
2654 | +operation. Some FS have multiple sets of them. For instance, ext2 has | |
2655 | +three sets, one for XIP, for NOBH, and for normal. | |
2656 | +Since aufs overrides and redirects these operations, sometimes aufs has | |
7e9cd9fe | 2657 | +to change its behaviour according to the branch FS type. More importantly |
53392da6 AM |
2658 | +VFS acts differently if a function (member in the struct) is set or |
2659 | +not. It means aufs should have several sets of operations and select one | |
2660 | +among them according to the branch FS definition. | |
2661 | + | |
7e9cd9fe | 2662 | +In order to solve this problem and not to affect the behaviour of VFS, |
53392da6 | 2663 | +aufs defines these operations dynamically. For instance, aufs defines |
7e9cd9fe AM |
2664 | +dummy direct_IO function for struct address_space_operations, but it may |
2665 | +not be set to the address_space_operations actually. When the branch FS | |
2666 | +doesn't have it, aufs doesn't set it to its address_space_operations | |
2667 | +while the function definition itself is still alive. So the behaviour | |
2668 | +itself will not change, and it will return an error when direct_IO is | |
2669 | +not set. | |
53392da6 AM |
2670 | + |
2671 | +The lifetime of these dynamically generated operation object is | |
2672 | +maintained by aufs branch object. When the branch is removed from aufs, | |
2673 | +the reference counter of the object is decremented. When it reaches | |
2674 | +zero, the dynamically generated operation object will be freed. | |
2675 | + | |
7e9cd9fe AM |
2676 | +This approach is designed to support AIO (io_submit), Direct I/O and |
2677 | +XIP (DAX) mainly. | |
2678 | +Currently this approach is applied to address_space_operations for | |
2679 | +regular files only. | |
53392da6 AM |
2680 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/README linux/Documentation/filesystems/aufs/README |
2681 | --- /usr/share/empty/Documentation/filesystems/aufs/README 1970-01-01 01:00:00.000000000 +0100 | |
c4adf169 | 2682 | +++ linux/Documentation/filesystems/aufs/README 2018-06-15 11:15:15.400449109 +0200 |
f2c43d5f | 2683 | @@ -0,0 +1,393 @@ |
53392da6 | 2684 | + |
5527c038 | 2685 | +Aufs4 -- advanced multi layered unification filesystem version 4.x |
53392da6 AM |
2686 | +http://aufs.sf.net |
2687 | +Junjiro R. Okajima | |
2688 | + | |
2689 | + | |
2690 | +0. Introduction | |
2691 | +---------------------------------------- | |
2692 | +In the early days, aufs was entirely re-designed and re-implemented | |
7e9cd9fe | 2693 | +Unionfs Version 1.x series. Adding many original ideas, approaches, |
53392da6 AM |
2694 | +improvements and implementations, it becomes totally different from |
2695 | +Unionfs while keeping the basic features. | |
2696 | +Recently, Unionfs Version 2.x series begin taking some of the same | |
2697 | +approaches to aufs1's. | |
2698 | +Unionfs is being developed by Professor Erez Zadok at Stony Brook | |
2699 | +University and his team. | |
2700 | + | |
5527c038 | 2701 | +Aufs4 supports linux-4.0 and later, and for linux-3.x series try aufs3. |
53392da6 AM |
2702 | +If you want older kernel version support, try aufs2-2.6.git or |
2703 | +aufs2-standalone.git repository, aufs1 from CVS on SourceForge. | |
2704 | + | |
2705 | +Note: it becomes clear that "Aufs was rejected. Let's give it up." | |
38d290e6 JR |
2706 | + According to Christoph Hellwig, linux rejects all union-type |
2707 | + filesystems but UnionMount. | |
53392da6 AM |
2708 | +<http://marc.info/?l=linux-kernel&m=123938533724484&w=2> |
2709 | + | |
38d290e6 JR |
2710 | +PS. Al Viro seems have a plan to merge aufs as well as overlayfs and |
2711 | + UnionMount, and he pointed out an issue around a directory mutex | |
2712 | + lock and aufs addressed it. But it is still unsure whether aufs will | |
2713 | + be merged (or any other union solution). | |
076b876e | 2714 | +<http://marc.info/?l=linux-kernel&m=136312705029295&w=1> |
38d290e6 | 2715 | + |
53392da6 AM |
2716 | + |
2717 | +1. Features | |
2718 | +---------------------------------------- | |
2719 | +- unite several directories into a single virtual filesystem. The member | |
2720 | + directory is called as a branch. | |
2721 | +- you can specify the permission flags to the branch, which are 'readonly', | |
2722 | + 'readwrite' and 'whiteout-able.' | |
2723 | +- by upper writable branch, internal copyup and whiteout, files/dirs on | |
2724 | + readonly branch are modifiable logically. | |
2725 | +- dynamic branch manipulation, add, del. | |
2726 | +- etc... | |
2727 | + | |
7e9cd9fe AM |
2728 | +Also there are many enhancements in aufs, such as: |
2729 | +- test only the highest one for the directory permission (dirperm1) | |
2730 | +- copyup on open (coo=) | |
2731 | +- 'move' policy for copy-up between two writable branches, after | |
2732 | + checking free space. | |
2733 | +- xattr, acl | |
53392da6 AM |
2734 | +- readdir(3) in userspace. |
2735 | +- keep inode number by external inode number table | |
2736 | +- keep the timestamps of file/dir in internal copyup operation | |
2737 | +- seekable directory, supporting NFS readdir. | |
2738 | +- whiteout is hardlinked in order to reduce the consumption of inodes | |
2739 | + on branch | |
2740 | +- do not copyup, nor create a whiteout when it is unnecessary | |
2741 | +- revert a single systemcall when an error occurs in aufs | |
2742 | +- remount interface instead of ioctl | |
2743 | +- maintain /etc/mtab by an external command, /sbin/mount.aufs. | |
2744 | +- loopback mounted filesystem as a branch | |
2745 | +- kernel thread for removing the dir who has a plenty of whiteouts | |
2746 | +- support copyup sparse file (a file which has a 'hole' in it) | |
2747 | +- default permission flags for branches | |
2748 | +- selectable permission flags for ro branch, whether whiteout can | |
2749 | + exist or not | |
2750 | +- export via NFS. | |
2751 | +- support <sysfs>/fs/aufs and <debugfs>/aufs. | |
2752 | +- support multiple writable branches, some policies to select one | |
2753 | + among multiple writable branches. | |
2754 | +- a new semantics for link(2) and rename(2) to support multiple | |
2755 | + writable branches. | |
2756 | +- no glibc changes are required. | |
2757 | +- pseudo hardlink (hardlink over branches) | |
2758 | +- allow a direct access manually to a file on branch, e.g. bypassing aufs. | |
2759 | + including NFS or remote filesystem branch. | |
2760 | +- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX. | |
2761 | +- and more... | |
2762 | + | |
5527c038 | 2763 | +Currently these features are dropped temporary from aufs4. |
53392da6 | 2764 | +See design/08plan.txt in detail. |
53392da6 AM |
2765 | +- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs |
2766 | + (robr) | |
2767 | +- statistics of aufs thread (/sys/fs/aufs/stat) | |
53392da6 AM |
2768 | + |
2769 | +Features or just an idea in the future (see also design/*.txt), | |
2770 | +- reorder the branch index without del/re-add. | |
2771 | +- permanent xino files for NFSD | |
2772 | +- an option for refreshing the opened files after add/del branches | |
53392da6 AM |
2773 | +- light version, without branch manipulation. (unnecessary?) |
2774 | +- copyup in userspace | |
2775 | +- inotify in userspace | |
2776 | +- readv/writev | |
53392da6 AM |
2777 | + |
2778 | + | |
2779 | +2. Download | |
2780 | +---------------------------------------- | |
5527c038 JR |
2781 | +There are three GIT trees for aufs4, aufs4-linux.git, |
2782 | +aufs4-standalone.git, and aufs-util.git. Note that there is no "4" in | |
1e00d052 | 2783 | +"aufs-util.git." |
5527c038 JR |
2784 | +While the aufs-util is always necessary, you need either of aufs4-linux |
2785 | +or aufs4-standalone. | |
1e00d052 | 2786 | + |
5527c038 | 2787 | +The aufs4-linux tree includes the whole linux mainline GIT tree, |
1e00d052 AM |
2788 | +git://git.kernel.org/.../torvalds/linux.git. |
2789 | +And you cannot select CONFIG_AUFS_FS=m for this version, eg. you cannot | |
5527c038 | 2790 | +build aufs4 as an external kernel module. |
2000de60 | 2791 | +Several extra patches are not included in this tree. Only |
be52b249 | 2792 | +aufs4-standalone tree contains them. They are described in the later |
2000de60 | 2793 | +section "Configuration and Compilation." |
1e00d052 | 2794 | + |
5527c038 | 2795 | +On the other hand, the aufs4-standalone tree has only aufs source files |
53392da6 | 2796 | +and necessary patches, and you can select CONFIG_AUFS_FS=m. |
2000de60 | 2797 | +But you need to apply all aufs patches manually. |
53392da6 | 2798 | + |
5527c038 JR |
2799 | +You will find GIT branches whose name is in form of "aufs4.x" where "x" |
2800 | +represents the linux kernel version, "linux-4.x". For instance, | |
2801 | +"aufs4.0" is for linux-4.0. For latest "linux-4.x-rcN", use | |
2802 | +"aufs4.x-rcN" branch. | |
1e00d052 | 2803 | + |
5527c038 | 2804 | +o aufs4-linux tree |
1e00d052 | 2805 | +$ git clone --reference /your/linux/git/tree \ |
5527c038 | 2806 | + git://github.com/sfjro/aufs4-linux.git aufs4-linux.git |
1e00d052 | 2807 | +- if you don't have linux GIT tree, then remove "--reference ..." |
5527c038 JR |
2808 | +$ cd aufs4-linux.git |
2809 | +$ git checkout origin/aufs4.0 | |
53392da6 | 2810 | + |
2000de60 JR |
2811 | +Or You may want to directly git-pull aufs into your linux GIT tree, and |
2812 | +leave the patch-work to GIT. | |
2813 | +$ cd /your/linux/git/tree | |
5527c038 JR |
2814 | +$ git remote add aufs4 git://github.com/sfjro/aufs4-linux.git |
2815 | +$ git fetch aufs4 | |
2816 | +$ git checkout -b my4.0 v4.0 | |
2817 | +$ (add your local change...) | |
2818 | +$ git pull aufs4 aufs4.0 | |
2819 | +- now you have v4.0 + your_changes + aufs4.0 in you my4.0 branch. | |
2000de60 | 2820 | +- you may need to solve some conflicts between your_changes and |
5527c038 JR |
2821 | + aufs4.0. in this case, git-rerere is recommended so that you can |
2822 | + solve the similar conflicts automatically when you upgrade to 4.1 or | |
2000de60 JR |
2823 | + later in the future. |
2824 | + | |
5527c038 JR |
2825 | +o aufs4-standalone tree |
2826 | +$ git clone git://github.com/sfjro/aufs4-standalone.git aufs4-standalone.git | |
2827 | +$ cd aufs4-standalone.git | |
2828 | +$ git checkout origin/aufs4.0 | |
53392da6 AM |
2829 | + |
2830 | +o aufs-util tree | |
5527c038 JR |
2831 | +$ git clone git://git.code.sf.net/p/aufs/aufs-util aufs-util.git |
2832 | +- note that the public aufs-util.git is on SourceForge instead of | |
2833 | + GitHUB. | |
53392da6 | 2834 | +$ cd aufs-util.git |
5527c038 | 2835 | +$ git checkout origin/aufs4.0 |
53392da6 | 2836 | + |
5527c038 JR |
2837 | +Note: The 4.x-rcN branch is to be used with `rc' kernel versions ONLY. |
2838 | +The minor version number, 'x' in '4.x', of aufs may not always | |
9dbd164d AM |
2839 | +follow the minor version number of the kernel. |
2840 | +Because changes in the kernel that cause the use of a new | |
2841 | +minor version number do not always require changes to aufs-util. | |
2842 | + | |
2843 | +Since aufs-util has its own minor version number, you may not be | |
2844 | +able to find a GIT branch in aufs-util for your kernel's | |
2845 | +exact minor version number. | |
2846 | +In this case, you should git-checkout the branch for the | |
53392da6 | 2847 | +nearest lower number. |
9dbd164d AM |
2848 | + |
2849 | +For (an unreleased) example: | |
5527c038 JR |
2850 | +If you are using "linux-4.10" and the "aufs4.10" branch |
2851 | +does not exist in aufs-util repository, then "aufs4.9", "aufs4.8" | |
9dbd164d AM |
2852 | +or something numerically smaller is the branch for your kernel. |
2853 | + | |
53392da6 AM |
2854 | +Also you can view all branches by |
2855 | + $ git branch -a | |
2856 | + | |
2857 | + | |
2858 | +3. Configuration and Compilation | |
2859 | +---------------------------------------- | |
2860 | +Make sure you have git-checkout'ed the correct branch. | |
2861 | + | |
5527c038 | 2862 | +For aufs4-linux tree, |
c06a8ce3 | 2863 | +- enable CONFIG_AUFS_FS. |
1e00d052 AM |
2864 | +- set other aufs configurations if necessary. |
2865 | + | |
5527c038 | 2866 | +For aufs4-standalone tree, |
53392da6 AM |
2867 | +There are several ways to build. |
2868 | + | |
2869 | +1. | |
5527c038 JR |
2870 | +- apply ./aufs4-kbuild.patch to your kernel source files. |
2871 | +- apply ./aufs4-base.patch too. | |
2872 | +- apply ./aufs4-mmap.patch too. | |
2873 | +- apply ./aufs4-standalone.patch too, if you have a plan to set | |
2874 | + CONFIG_AUFS_FS=m. otherwise you don't need ./aufs4-standalone.patch. | |
537831f9 AM |
2875 | +- copy ./{Documentation,fs,include/uapi/linux/aufs_type.h} files to your |
2876 | + kernel source tree. Never copy $PWD/include/uapi/linux/Kbuild. | |
c06a8ce3 | 2877 | +- enable CONFIG_AUFS_FS, you can select either |
53392da6 AM |
2878 | + =m or =y. |
2879 | +- and build your kernel as usual. | |
2880 | +- install the built kernel. | |
c06a8ce3 AM |
2881 | + Note: Since linux-3.9, every filesystem module requires an alias |
2882 | + "fs-<fsname>". You should make sure that "fs-aufs" is listed in your | |
2883 | + modules.aliases file if you set CONFIG_AUFS_FS=m. | |
7eafdf33 AM |
2884 | +- install the header files too by "make headers_install" to the |
2885 | + directory where you specify. By default, it is $PWD/usr. | |
b4510431 | 2886 | + "make help" shows a brief note for headers_install. |
53392da6 AM |
2887 | +- and reboot your system. |
2888 | + | |
2889 | +2. | |
2890 | +- module only (CONFIG_AUFS_FS=m). | |
5527c038 JR |
2891 | +- apply ./aufs4-base.patch to your kernel source files. |
2892 | +- apply ./aufs4-mmap.patch too. | |
2893 | +- apply ./aufs4-standalone.patch too. | |
53392da6 AM |
2894 | +- build your kernel, don't forget "make headers_install", and reboot. |
2895 | +- edit ./config.mk and set other aufs configurations if necessary. | |
b4510431 | 2896 | + Note: You should read $PWD/fs/aufs/Kconfig carefully which describes |
53392da6 AM |
2897 | + every aufs configurations. |
2898 | +- build the module by simple "make". | |
c06a8ce3 AM |
2899 | + Note: Since linux-3.9, every filesystem module requires an alias |
2900 | + "fs-<fsname>". You should make sure that "fs-aufs" is listed in your | |
2901 | + modules.aliases file. | |
53392da6 AM |
2902 | +- you can specify ${KDIR} make variable which points to your kernel |
2903 | + source tree. | |
2904 | +- install the files | |
2905 | + + run "make install" to install the aufs module, or copy the built | |
b4510431 AM |
2906 | + $PWD/aufs.ko to /lib/modules/... and run depmod -a (or reboot simply). |
2907 | + + run "make install_headers" (instead of headers_install) to install | |
2908 | + the modified aufs header file (you can specify DESTDIR which is | |
2909 | + available in aufs standalone version's Makefile only), or copy | |
2910 | + $PWD/usr/include/linux/aufs_type.h to /usr/include/linux or wherever | |
2911 | + you like manually. By default, the target directory is $PWD/usr. | |
5527c038 | 2912 | +- no need to apply aufs4-kbuild.patch, nor copying source files to your |
53392da6 AM |
2913 | + kernel source tree. |
2914 | + | |
b4510431 | 2915 | +Note: The header file aufs_type.h is necessary to build aufs-util |
53392da6 AM |
2916 | + as well as "make headers_install" in the kernel source tree. |
2917 | + headers_install is subject to be forgotten, but it is essentially | |
2918 | + necessary, not only for building aufs-util. | |
2919 | + You may not meet problems without headers_install in some older | |
2920 | + version though. | |
2921 | + | |
2922 | +And then, | |
2923 | +- read README in aufs-util, build and install it | |
9dbd164d AM |
2924 | +- note that your distribution may contain an obsoleted version of |
2925 | + aufs_type.h in /usr/include/linux or something. When you build aufs | |
2926 | + utilities, make sure that your compiler refers the correct aufs header | |
2927 | + file which is built by "make headers_install." | |
53392da6 AM |
2928 | +- if you want to use readdir(3) in userspace or pathconf(3) wrapper, |
2929 | + then run "make install_ulib" too. And refer to the aufs manual in | |
2930 | + detail. | |
2931 | + | |
5527c038 | 2932 | +There several other patches in aufs4-standalone.git. They are all |
38d290e6 | 2933 | +optional. When you meet some problems, they will help you. |
5527c038 | 2934 | +- aufs4-loopback.patch |
38d290e6 JR |
2935 | + Supports a nested loopback mount in a branch-fs. This patch is |
2936 | + unnecessary until aufs produces a message like "you may want to try | |
2937 | + another patch for loopback file". | |
2938 | +- vfs-ino.patch | |
2939 | + Modifies a system global kernel internal function get_next_ino() in | |
2940 | + order to stop assigning 0 for an inode-number. Not directly related to | |
2941 | + aufs, but recommended generally. | |
2942 | +- tmpfs-idr.patch | |
2943 | + Keeps the tmpfs inode number as the lowest value. Effective to reduce | |
2944 | + the size of aufs XINO files for tmpfs branch. Also it prevents the | |
2945 | + duplication of inode number, which is important for backup tools and | |
2946 | + other utilities. When you find aufs XINO files for tmpfs branch | |
2947 | + growing too much, try this patch. | |
be52b249 AM |
2948 | +- lockdep-debug.patch |
2949 | + Because aufs is not only an ordinary filesystem (callee of VFS), but | |
2950 | + also a caller of VFS functions for branch filesystems, subclassing of | |
2951 | + the internal locks for LOCKDEP is necessary. LOCKDEP is a debugging | |
2952 | + feature of linux kernel. If you enable CONFIG_LOCKDEP, then you will | |
2953 | + need to apply this debug patch to expand several constant values. | |
2954 | + If don't know what LOCKDEP, then you don't have apply this patch. | |
38d290e6 | 2955 | + |
53392da6 AM |
2956 | + |
2957 | +4. Usage | |
2958 | +---------------------------------------- | |
2959 | +At first, make sure aufs-util are installed, and please read the aufs | |
2960 | +manual, aufs.5 in aufs-util.git tree. | |
2961 | +$ man -l aufs.5 | |
2962 | + | |
2963 | +And then, | |
2964 | +$ mkdir /tmp/rw /tmp/aufs | |
2965 | +# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs | |
2966 | + | |
2967 | +Here is another example. The result is equivalent. | |
2968 | +# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs | |
2969 | + Or | |
2970 | +# mount -t aufs -o br:/tmp/rw none /tmp/aufs | |
2971 | +# mount -o remount,append:${HOME} /tmp/aufs | |
2972 | + | |
2973 | +Then, you can see whole tree of your home dir through /tmp/aufs. If | |
2974 | +you modify a file under /tmp/aufs, the one on your home directory is | |
2975 | +not affected, instead the same named file will be newly created under | |
2976 | +/tmp/rw. And all of your modification to a file will be applied to | |
2977 | +the one under /tmp/rw. This is called the file based Copy on Write | |
2978 | +(COW) method. | |
2979 | +Aufs mount options are described in aufs.5. | |
2980 | +If you run chroot or something and make your aufs as a root directory, | |
2981 | +then you need to customize the shutdown script. See the aufs manual in | |
2982 | +detail. | |
2983 | + | |
2984 | +Additionally, there are some sample usages of aufs which are a | |
2985 | +diskless system with network booting, and LiveCD over NFS. | |
2986 | +See sample dir in CVS tree on SourceForge. | |
2987 | + | |
2988 | + | |
2989 | +5. Contact | |
2990 | +---------------------------------------- | |
2991 | +When you have any problems or strange behaviour in aufs, please let me | |
2992 | +know with: | |
2993 | +- /proc/mounts (instead of the output of mount(8)) | |
2994 | +- /sys/module/aufs/* | |
2995 | +- /sys/fs/aufs/* (if you have them) | |
2996 | +- /debug/aufs/* (if you have them) | |
2997 | +- linux kernel version | |
2998 | + if your kernel is not plain, for example modified by distributor, | |
2999 | + the url where i can download its source is necessary too. | |
3000 | +- aufs version which was printed at loading the module or booting the | |
3001 | + system, instead of the date you downloaded. | |
3002 | +- configuration (define/undefine CONFIG_AUFS_xxx) | |
3003 | +- kernel configuration or /proc/config.gz (if you have it) | |
3004 | +- behaviour which you think to be incorrect | |
3005 | +- actual operation, reproducible one is better | |
3006 | +- mailto: aufs-users at lists.sourceforge.net | |
3007 | + | |
3008 | +Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches, | |
3009 | +and Feature Requests) on SourceForge. Please join and write to | |
3010 | +aufs-users ML. | |
3011 | + | |
3012 | + | |
3013 | +6. Acknowledgements | |
3014 | +---------------------------------------- | |
3015 | +Thanks to everyone who have tried and are using aufs, whoever | |
3016 | +have reported a bug or any feedback. | |
3017 | + | |
3018 | +Especially donators: | |
3019 | +Tomas Matejicek(slax.org) made a donation (much more than once). | |
3020 | + Since Apr 2010, Tomas M (the author of Slax and Linux Live | |
3021 | + scripts) is making "doubling" donations. | |
3022 | + Unfortunately I cannot list all of the donators, but I really | |
b4510431 | 3023 | + appreciate. |
53392da6 AM |
3024 | + It ends Aug 2010, but the ordinary donation URL is still available. |
3025 | + <http://sourceforge.net/donate/index.php?group_id=167503> | |
3026 | +Dai Itasaka made a donation (2007/8). | |
3027 | +Chuck Smith made a donation (2008/4, 10 and 12). | |
3028 | +Henk Schoneveld made a donation (2008/9). | |
3029 | +Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10). | |
3030 | +Francois Dupoux made a donation (2008/11). | |
3031 | +Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public | |
3032 | + aufs2 GIT tree (2009/2). | |
3033 | +William Grant made a donation (2009/3). | |
3034 | +Patrick Lane made a donation (2009/4). | |
3035 | +The Mail Archive (mail-archive.com) made donations (2009/5). | |
3036 | +Nippy Networks (Ed Wildgoose) made a donation (2009/7). | |
3037 | +New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11). | |
3038 | +Pavel Pronskiy made a donation (2011/2). | |
3039 | +Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy | |
3040 | + Networks (Ed Wildgoose) made a donation for hardware (2011/3). | |
537831f9 AM |
3041 | +Max Lekomcev (DOM-TV project) made a donation (2011/7, 12, 2012/3, 6 and |
3042 | +11). | |
1e00d052 | 3043 | +Sam Liddicott made a donation (2011/9). |
86dc4139 AM |
3044 | +Era Scarecrow made a donation (2013/4). |
3045 | +Bor Ratajc made a donation (2013/4). | |
3046 | +Alessandro Gorreta made a donation (2013/4). | |
3047 | +POIRETTE Marc made a donation (2013/4). | |
3048 | +Alessandro Gorreta made a donation (2013/4). | |
3049 | +lauri kasvandik made a donation (2013/5). | |
392086de | 3050 | +"pemasu from Finland" made a donation (2013/7). |
523b37e3 AM |
3051 | +The Parted Magic Project made a donation (2013/9 and 11). |
3052 | +Pavel Barta made a donation (2013/10). | |
38d290e6 | 3053 | +Nikolay Pertsev made a donation (2014/5). |
c2c0f25c | 3054 | +James B made a donation (2014/7 and 2015/7). |
076b876e | 3055 | +Stefano Di Biase made a donation (2014/8). |
2000de60 | 3056 | +Daniel Epellei made a donation (2015/1). |
c4adf169 | 3057 | +OmegaPhil made a donation (2016/1, 2018/4). |
5afbbe0d | 3058 | +Tomasz Szewczyk made a donation (2016/4). |
f2c43d5f | 3059 | +James Burry made a donation (2016/12). |
53392da6 AM |
3060 | + |
3061 | +Thank you very much. | |
3062 | +Donations are always, including future donations, very important and | |
3063 | +helpful for me to keep on developing aufs. | |
3064 | + | |
3065 | + | |
3066 | +7. | |
3067 | +---------------------------------------- | |
3068 | +If you are an experienced user, no explanation is needed. Aufs is | |
3069 | +just a linux filesystem. | |
3070 | + | |
3071 | + | |
3072 | +Enjoy! | |
3073 | + | |
3074 | +# Local variables: ; | |
3075 | +# mode: text; | |
3076 | +# End: ; | |
7f207e10 AM |
3077 | diff -urN /usr/share/empty/fs/aufs/aufs.h linux/fs/aufs/aufs.h |
3078 | --- /usr/share/empty/fs/aufs/aufs.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 3079 | +++ linux/fs/aufs/aufs.h 2018-08-12 23:43:05.450124426 +0200 |
062440b3 AM |
3080 | @@ -0,0 +1,61 @@ |
3081 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
7f207e10 | 3082 | +/* |
b00004a5 | 3083 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
7f207e10 AM |
3084 | + * |
3085 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3086 | + * it under the terms of the GNU General Public License as published by | |
3087 | + * the Free Software Foundation; either version 2 of the License, or | |
3088 | + * (at your option) any later version. | |
3089 | + * | |
3090 | + * This program is distributed in the hope that it will be useful, | |
3091 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3092 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3093 | + * GNU General Public License for more details. | |
3094 | + * | |
3095 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 3096 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
3097 | + */ |
3098 | + | |
3099 | +/* | |
3100 | + * all header files | |
3101 | + */ | |
3102 | + | |
3103 | +#ifndef __AUFS_H__ | |
3104 | +#define __AUFS_H__ | |
3105 | + | |
3106 | +#ifdef __KERNEL__ | |
3107 | + | |
3108 | +#define AuStub(type, name, body, ...) \ | |
3109 | + static inline type name(__VA_ARGS__) { body; } | |
3110 | + | |
3111 | +#define AuStubVoid(name, ...) \ | |
3112 | + AuStub(void, name, , __VA_ARGS__) | |
3113 | +#define AuStubInt0(name, ...) \ | |
3114 | + AuStub(int, name, return 0, __VA_ARGS__) | |
3115 | + | |
3116 | +#include "debug.h" | |
3117 | + | |
3118 | +#include "branch.h" | |
3119 | +#include "cpup.h" | |
3120 | +#include "dcsub.h" | |
3121 | +#include "dbgaufs.h" | |
3122 | +#include "dentry.h" | |
3123 | +#include "dir.h" | |
8b6a4947 | 3124 | +#include "dirren.h" |
7f207e10 AM |
3125 | +#include "dynop.h" |
3126 | +#include "file.h" | |
3127 | +#include "fstype.h" | |
8b6a4947 | 3128 | +#include "hbl.h" |
7f207e10 AM |
3129 | +#include "inode.h" |
3130 | +#include "loop.h" | |
3131 | +#include "module.h" | |
7f207e10 AM |
3132 | +#include "opts.h" |
3133 | +#include "rwsem.h" | |
7f207e10 AM |
3134 | +#include "super.h" |
3135 | +#include "sysaufs.h" | |
3136 | +#include "vfsub.h" | |
3137 | +#include "whout.h" | |
3138 | +#include "wkq.h" | |
3139 | + | |
3140 | +#endif /* __KERNEL__ */ | |
3141 | +#endif /* __AUFS_H__ */ | |
3142 | diff -urN /usr/share/empty/fs/aufs/branch.c linux/fs/aufs/branch.c | |
3143 | --- /usr/share/empty/fs/aufs/branch.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 3144 | +++ linux/fs/aufs/branch.c 2018-08-12 23:43:05.450124426 +0200 |
062440b3 | 3145 | @@ -0,0 +1,1422 @@ |
cd7a4cd9 | 3146 | +// SPDX-License-Identifier: GPL-2.0 |
7f207e10 | 3147 | +/* |
b00004a5 | 3148 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
7f207e10 AM |
3149 | + * |
3150 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3151 | + * it under the terms of the GNU General Public License as published by | |
3152 | + * the Free Software Foundation; either version 2 of the License, or | |
3153 | + * (at your option) any later version. | |
3154 | + * | |
3155 | + * This program is distributed in the hope that it will be useful, | |
3156 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3157 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3158 | + * GNU General Public License for more details. | |
3159 | + * | |
3160 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 3161 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
3162 | + */ |
3163 | + | |
3164 | +/* | |
3165 | + * branch management | |
3166 | + */ | |
3167 | + | |
027c5e7a | 3168 | +#include <linux/compat.h> |
7f207e10 AM |
3169 | +#include <linux/statfs.h> |
3170 | +#include "aufs.h" | |
3171 | + | |
3172 | +/* | |
3173 | + * free a single branch | |
1facf9fc | 3174 | + */ |
3175 | +static void au_br_do_free(struct au_branch *br) | |
3176 | +{ | |
3177 | + int i; | |
3178 | + struct au_wbr *wbr; | |
4a4d8108 | 3179 | + struct au_dykey **key; |
1facf9fc | 3180 | + |
027c5e7a | 3181 | + au_hnotify_fin_br(br); |
8b6a4947 AM |
3182 | + /* always, regardless the mount option */ |
3183 | + au_dr_hino_free(&br->br_dirren); | |
062440b3 | 3184 | + au_xino_put(br); |
1facf9fc | 3185 | + |
5afbbe0d AM |
3186 | + AuDebugOn(au_br_count(br)); |
3187 | + au_br_count_fin(br); | |
1facf9fc | 3188 | + |
3189 | + wbr = br->br_wbr; | |
3190 | + if (wbr) { | |
3191 | + for (i = 0; i < AuBrWh_Last; i++) | |
3192 | + dput(wbr->wbr_wh[i]); | |
3193 | + AuDebugOn(atomic_read(&wbr->wbr_wh_running)); | |
dece6358 | 3194 | + AuRwDestroy(&wbr->wbr_wh_rwsem); |
1facf9fc | 3195 | + } |
3196 | + | |
076b876e AM |
3197 | + if (br->br_fhsm) { |
3198 | + au_br_fhsm_fin(br->br_fhsm); | |
1c60b727 | 3199 | + kfree(br->br_fhsm); |
076b876e AM |
3200 | + } |
3201 | + | |
4a4d8108 AM |
3202 | + key = br->br_dykey; |
3203 | + for (i = 0; i < AuBrDynOp; i++, key++) | |
3204 | + if (*key) | |
3205 | + au_dy_put(*key); | |
3206 | + else | |
3207 | + break; | |
3208 | + | |
537831f9 AM |
3209 | + /* recursive lock, s_umount of branch's */ |
3210 | + lockdep_off(); | |
86dc4139 | 3211 | + path_put(&br->br_path); |
537831f9 | 3212 | + lockdep_on(); |
1c60b727 AM |
3213 | + kfree(wbr); |
3214 | + kfree(br); | |
1facf9fc | 3215 | +} |
3216 | + | |
3217 | +/* | |
3218 | + * frees all branches | |
3219 | + */ | |
3220 | +void au_br_free(struct au_sbinfo *sbinfo) | |
3221 | +{ | |
3222 | + aufs_bindex_t bmax; | |
3223 | + struct au_branch **br; | |
3224 | + | |
dece6358 AM |
3225 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
3226 | + | |
5afbbe0d | 3227 | + bmax = sbinfo->si_bbot + 1; |
1facf9fc | 3228 | + br = sbinfo->si_branch; |
3229 | + while (bmax--) | |
3230 | + au_br_do_free(*br++); | |
3231 | +} | |
3232 | + | |
3233 | +/* | |
3234 | + * find the index of a branch which is specified by @br_id. | |
3235 | + */ | |
3236 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id) | |
3237 | +{ | |
5afbbe0d | 3238 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 3239 | + |
5afbbe0d AM |
3240 | + bbot = au_sbbot(sb); |
3241 | + for (bindex = 0; bindex <= bbot; bindex++) | |
1facf9fc | 3242 | + if (au_sbr_id(sb, bindex) == br_id) |
3243 | + return bindex; | |
3244 | + return -1; | |
3245 | +} | |
3246 | + | |
3247 | +/* ---------------------------------------------------------------------- */ | |
3248 | + | |
3249 | +/* | |
3250 | + * add a branch | |
3251 | + */ | |
3252 | + | |
b752ccd1 AM |
3253 | +static int test_overlap(struct super_block *sb, struct dentry *h_adding, |
3254 | + struct dentry *h_root) | |
1facf9fc | 3255 | +{ |
b752ccd1 AM |
3256 | + if (unlikely(h_adding == h_root |
3257 | + || au_test_loopback_overlap(sb, h_adding))) | |
1facf9fc | 3258 | + return 1; |
b752ccd1 AM |
3259 | + if (h_adding->d_sb != h_root->d_sb) |
3260 | + return 0; | |
3261 | + return au_test_subdir(h_adding, h_root) | |
3262 | + || au_test_subdir(h_root, h_adding); | |
1facf9fc | 3263 | +} |
3264 | + | |
3265 | +/* | |
3266 | + * returns a newly allocated branch. @new_nbranch is a number of branches | |
3267 | + * after adding a branch. | |
3268 | + */ | |
3269 | +static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch, | |
3270 | + int perm) | |
3271 | +{ | |
3272 | + struct au_branch *add_branch; | |
3273 | + struct dentry *root; | |
5527c038 | 3274 | + struct inode *inode; |
4a4d8108 | 3275 | + int err; |
1facf9fc | 3276 | + |
4a4d8108 | 3277 | + err = -ENOMEM; |
be52b249 | 3278 | + add_branch = kzalloc(sizeof(*add_branch), GFP_NOFS); |
1facf9fc | 3279 | + if (unlikely(!add_branch)) |
3280 | + goto out; | |
062440b3 AM |
3281 | + add_branch->br_xino = au_xino_alloc(); |
3282 | + if (unlikely(!add_branch->br_xino)) | |
521ced18 | 3283 | + goto out_br; |
027c5e7a AM |
3284 | + err = au_hnotify_init_br(add_branch, perm); |
3285 | + if (unlikely(err)) | |
062440b3 | 3286 | + goto out_xino; |
027c5e7a | 3287 | + |
1facf9fc | 3288 | + if (au_br_writable(perm)) { |
3289 | + /* may be freed separately at changing the branch permission */ | |
be52b249 | 3290 | + add_branch->br_wbr = kzalloc(sizeof(*add_branch->br_wbr), |
1facf9fc | 3291 | + GFP_NOFS); |
3292 | + if (unlikely(!add_branch->br_wbr)) | |
027c5e7a | 3293 | + goto out_hnotify; |
1facf9fc | 3294 | + } |
3295 | + | |
076b876e AM |
3296 | + if (au_br_fhsm(perm)) { |
3297 | + err = au_fhsm_br_alloc(add_branch); | |
3298 | + if (unlikely(err)) | |
3299 | + goto out_wbr; | |
3300 | + } | |
3301 | + | |
521ced18 | 3302 | + root = sb->s_root; |
e2f27e51 | 3303 | + err = au_sbr_realloc(au_sbi(sb), new_nbranch, /*may_shrink*/0); |
4a4d8108 | 3304 | + if (!err) |
e2f27e51 | 3305 | + err = au_di_realloc(au_di(root), new_nbranch, /*may_shrink*/0); |
5527c038 JR |
3306 | + if (!err) { |
3307 | + inode = d_inode(root); | |
1c60b727 AM |
3308 | + err = au_hinode_realloc(au_ii(inode), new_nbranch, |
3309 | + /*may_shrink*/0); | |
5527c038 | 3310 | + } |
4a4d8108 AM |
3311 | + if (!err) |
3312 | + return add_branch; /* success */ | |
1facf9fc | 3313 | + |
076b876e | 3314 | +out_wbr: |
1c60b727 | 3315 | + kfree(add_branch->br_wbr); |
027c5e7a AM |
3316 | +out_hnotify: |
3317 | + au_hnotify_fin_br(add_branch); | |
062440b3 AM |
3318 | +out_xino: |
3319 | + au_xino_put(add_branch); | |
4f0767ce | 3320 | +out_br: |
1c60b727 | 3321 | + kfree(add_branch); |
4f0767ce | 3322 | +out: |
4a4d8108 | 3323 | + return ERR_PTR(err); |
1facf9fc | 3324 | +} |
3325 | + | |
3326 | +/* | |
3327 | + * test if the branch permission is legal or not. | |
3328 | + */ | |
3329 | +static int test_br(struct inode *inode, int brperm, char *path) | |
3330 | +{ | |
3331 | + int err; | |
3332 | + | |
4a4d8108 AM |
3333 | + err = (au_br_writable(brperm) && IS_RDONLY(inode)); |
3334 | + if (!err) | |
3335 | + goto out; | |
1facf9fc | 3336 | + |
4a4d8108 AM |
3337 | + err = -EINVAL; |
3338 | + pr_err("write permission for readonly mount or inode, %s\n", path); | |
3339 | + | |
4f0767ce | 3340 | +out: |
1facf9fc | 3341 | + return err; |
3342 | +} | |
3343 | + | |
3344 | +/* | |
3345 | + * returns: | |
3346 | + * 0: success, the caller will add it | |
3347 | + * plus: success, it is already unified, the caller should ignore it | |
3348 | + * minus: error | |
3349 | + */ | |
3350 | +static int test_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
3351 | +{ | |
3352 | + int err; | |
5afbbe0d | 3353 | + aufs_bindex_t bbot, bindex; |
5527c038 | 3354 | + struct dentry *root, *h_dentry; |
1facf9fc | 3355 | + struct inode *inode, *h_inode; |
3356 | + | |
3357 | + root = sb->s_root; | |
5afbbe0d AM |
3358 | + bbot = au_sbbot(sb); |
3359 | + if (unlikely(bbot >= 0 | |
1facf9fc | 3360 | + && au_find_dbindex(root, add->path.dentry) >= 0)) { |
3361 | + err = 1; | |
3362 | + if (!remount) { | |
3363 | + err = -EINVAL; | |
4a4d8108 | 3364 | + pr_err("%s duplicated\n", add->pathname); |
1facf9fc | 3365 | + } |
3366 | + goto out; | |
3367 | + } | |
3368 | + | |
3369 | + err = -ENOSPC; /* -E2BIG; */ | |
3370 | + if (unlikely(AUFS_BRANCH_MAX <= add->bindex | |
5afbbe0d | 3371 | + || AUFS_BRANCH_MAX - 1 <= bbot)) { |
4a4d8108 | 3372 | + pr_err("number of branches exceeded %s\n", add->pathname); |
1facf9fc | 3373 | + goto out; |
3374 | + } | |
3375 | + | |
3376 | + err = -EDOM; | |
5afbbe0d | 3377 | + if (unlikely(add->bindex < 0 || bbot + 1 < add->bindex)) { |
4a4d8108 | 3378 | + pr_err("bad index %d\n", add->bindex); |
1facf9fc | 3379 | + goto out; |
3380 | + } | |
3381 | + | |
5527c038 | 3382 | + inode = d_inode(add->path.dentry); |
1facf9fc | 3383 | + err = -ENOENT; |
3384 | + if (unlikely(!inode->i_nlink)) { | |
4a4d8108 | 3385 | + pr_err("no existence %s\n", add->pathname); |
1facf9fc | 3386 | + goto out; |
3387 | + } | |
3388 | + | |
3389 | + err = -EINVAL; | |
3390 | + if (unlikely(inode->i_sb == sb)) { | |
4a4d8108 | 3391 | + pr_err("%s must be outside\n", add->pathname); |
1facf9fc | 3392 | + goto out; |
3393 | + } | |
3394 | + | |
3395 | + if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) { | |
4a4d8108 AM |
3396 | + pr_err("unsupported filesystem, %s (%s)\n", |
3397 | + add->pathname, au_sbtype(inode->i_sb)); | |
1facf9fc | 3398 | + goto out; |
3399 | + } | |
3400 | + | |
c1595e42 JR |
3401 | + if (unlikely(inode->i_sb->s_stack_depth)) { |
3402 | + pr_err("already stacked, %s (%s)\n", | |
3403 | + add->pathname, au_sbtype(inode->i_sb)); | |
3404 | + goto out; | |
3405 | + } | |
3406 | + | |
5527c038 | 3407 | + err = test_br(d_inode(add->path.dentry), add->perm, add->pathname); |
1facf9fc | 3408 | + if (unlikely(err)) |
3409 | + goto out; | |
3410 | + | |
5afbbe0d | 3411 | + if (bbot < 0) |
1facf9fc | 3412 | + return 0; /* success */ |
3413 | + | |
3414 | + err = -EINVAL; | |
5afbbe0d | 3415 | + for (bindex = 0; bindex <= bbot; bindex++) |
1facf9fc | 3416 | + if (unlikely(test_overlap(sb, add->path.dentry, |
3417 | + au_h_dptr(root, bindex)))) { | |
4a4d8108 | 3418 | + pr_err("%s is overlapped\n", add->pathname); |
1facf9fc | 3419 | + goto out; |
3420 | + } | |
3421 | + | |
3422 | + err = 0; | |
3423 | + if (au_opt_test(au_mntflags(sb), WARN_PERM)) { | |
5527c038 JR |
3424 | + h_dentry = au_h_dptr(root, 0); |
3425 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 3426 | + if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO) |
0c3ec466 AM |
3427 | + || !uid_eq(h_inode->i_uid, inode->i_uid) |
3428 | + || !gid_eq(h_inode->i_gid, inode->i_gid)) | |
3429 | + pr_warn("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n", | |
3430 | + add->pathname, | |
3431 | + i_uid_read(inode), i_gid_read(inode), | |
3432 | + (inode->i_mode & S_IALLUGO), | |
3433 | + i_uid_read(h_inode), i_gid_read(h_inode), | |
3434 | + (h_inode->i_mode & S_IALLUGO)); | |
1facf9fc | 3435 | + } |
3436 | + | |
4f0767ce | 3437 | +out: |
1facf9fc | 3438 | + return err; |
3439 | +} | |
3440 | + | |
3441 | +/* | |
3442 | + * initialize or clean the whiteouts for an adding branch | |
3443 | + */ | |
3444 | +static int au_br_init_wh(struct super_block *sb, struct au_branch *br, | |
86dc4139 | 3445 | + int new_perm) |
1facf9fc | 3446 | +{ |
3447 | + int err, old_perm; | |
3448 | + aufs_bindex_t bindex; | |
febd17d6 | 3449 | + struct inode *h_inode; |
1facf9fc | 3450 | + struct au_wbr *wbr; |
3451 | + struct au_hinode *hdir; | |
5527c038 | 3452 | + struct dentry *h_dentry; |
1facf9fc | 3453 | + |
86dc4139 AM |
3454 | + err = vfsub_mnt_want_write(au_br_mnt(br)); |
3455 | + if (unlikely(err)) | |
3456 | + goto out; | |
3457 | + | |
1facf9fc | 3458 | + wbr = br->br_wbr; |
3459 | + old_perm = br->br_perm; | |
3460 | + br->br_perm = new_perm; | |
3461 | + hdir = NULL; | |
febd17d6 | 3462 | + h_inode = NULL; |
1facf9fc | 3463 | + bindex = au_br_index(sb, br->br_id); |
3464 | + if (0 <= bindex) { | |
5527c038 | 3465 | + hdir = au_hi(d_inode(sb->s_root), bindex); |
5afbbe0d | 3466 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 3467 | + } else { |
5527c038 | 3468 | + h_dentry = au_br_dentry(br); |
febd17d6 JR |
3469 | + h_inode = d_inode(h_dentry); |
3470 | + inode_lock_nested(h_inode, AuLsc_I_PARENT); | |
1facf9fc | 3471 | + } |
3472 | + if (!wbr) | |
86dc4139 | 3473 | + err = au_wh_init(br, sb); |
1facf9fc | 3474 | + else { |
3475 | + wbr_wh_write_lock(wbr); | |
86dc4139 | 3476 | + err = au_wh_init(br, sb); |
1facf9fc | 3477 | + wbr_wh_write_unlock(wbr); |
3478 | + } | |
3479 | + if (hdir) | |
5afbbe0d | 3480 | + au_hn_inode_unlock(hdir); |
1facf9fc | 3481 | + else |
febd17d6 | 3482 | + inode_unlock(h_inode); |
86dc4139 | 3483 | + vfsub_mnt_drop_write(au_br_mnt(br)); |
1facf9fc | 3484 | + br->br_perm = old_perm; |
3485 | + | |
3486 | + if (!err && wbr && !au_br_writable(new_perm)) { | |
1c60b727 | 3487 | + kfree(wbr); |
1facf9fc | 3488 | + br->br_wbr = NULL; |
3489 | + } | |
3490 | + | |
86dc4139 | 3491 | +out: |
1facf9fc | 3492 | + return err; |
3493 | +} | |
3494 | + | |
3495 | +static int au_wbr_init(struct au_branch *br, struct super_block *sb, | |
86dc4139 | 3496 | + int perm) |
1facf9fc | 3497 | +{ |
3498 | + int err; | |
4a4d8108 | 3499 | + struct kstatfs kst; |
1facf9fc | 3500 | + struct au_wbr *wbr; |
3501 | + | |
3502 | + wbr = br->br_wbr; | |
dece6358 | 3503 | + au_rw_init(&wbr->wbr_wh_rwsem); |
1facf9fc | 3504 | + atomic_set(&wbr->wbr_wh_running, 0); |
1facf9fc | 3505 | + |
4a4d8108 AM |
3506 | + /* |
3507 | + * a limit for rmdir/rename a dir | |
523b37e3 | 3508 | + * cf. AUFS_MAX_NAMELEN in include/uapi/linux/aufs_type.h |
4a4d8108 | 3509 | + */ |
86dc4139 | 3510 | + err = vfs_statfs(&br->br_path, &kst); |
4a4d8108 AM |
3511 | + if (unlikely(err)) |
3512 | + goto out; | |
3513 | + err = -EINVAL; | |
3514 | + if (kst.f_namelen >= NAME_MAX) | |
86dc4139 | 3515 | + err = au_br_init_wh(sb, br, perm); |
4a4d8108 | 3516 | + else |
523b37e3 AM |
3517 | + pr_err("%pd(%s), unsupported namelen %ld\n", |
3518 | + au_br_dentry(br), | |
86dc4139 | 3519 | + au_sbtype(au_br_dentry(br)->d_sb), kst.f_namelen); |
1facf9fc | 3520 | + |
4f0767ce | 3521 | +out: |
1facf9fc | 3522 | + return err; |
3523 | +} | |
3524 | + | |
c1595e42 | 3525 | +/* initialize a new branch */ |
1facf9fc | 3526 | +static int au_br_init(struct au_branch *br, struct super_block *sb, |
3527 | + struct au_opt_add *add) | |
3528 | +{ | |
3529 | + int err; | |
062440b3 AM |
3530 | + struct au_branch *brbase; |
3531 | + struct file *xf; | |
5527c038 | 3532 | + struct inode *h_inode; |
1facf9fc | 3533 | + |
3534 | + err = 0; | |
1facf9fc | 3535 | + br->br_perm = add->perm; |
86dc4139 | 3536 | + br->br_path = add->path; /* set first, path_get() later */ |
4a4d8108 | 3537 | + spin_lock_init(&br->br_dykey_lock); |
5afbbe0d | 3538 | + au_br_count_init(br); |
1facf9fc | 3539 | + br->br_id = au_new_br_id(sb); |
7f207e10 | 3540 | + AuDebugOn(br->br_id < 0); |
1facf9fc | 3541 | + |
8b6a4947 AM |
3542 | + /* always, regardless the given option */ |
3543 | + err = au_dr_br_init(sb, br, &add->path); | |
3544 | + if (unlikely(err)) | |
3545 | + goto out_err; | |
3546 | + | |
1facf9fc | 3547 | + if (au_br_writable(add->perm)) { |
86dc4139 | 3548 | + err = au_wbr_init(br, sb, add->perm); |
1facf9fc | 3549 | + if (unlikely(err)) |
b752ccd1 | 3550 | + goto out_err; |
1facf9fc | 3551 | + } |
3552 | + | |
3553 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
062440b3 AM |
3554 | + brbase = au_sbr(sb, 0); |
3555 | + xf = au_xino_file(brbase); | |
3556 | + AuDebugOn(!xf); | |
5527c038 | 3557 | + h_inode = d_inode(add->path.dentry); |
062440b3 | 3558 | + err = au_xino_init_br(sb, br, h_inode->i_ino, &xf->f_path); |
1facf9fc | 3559 | + if (unlikely(err)) { |
062440b3 | 3560 | + AuDebugOn(au_xino_file(br)); |
b752ccd1 | 3561 | + goto out_err; |
1facf9fc | 3562 | + } |
3563 | + } | |
3564 | + | |
3565 | + sysaufs_br_init(br); | |
86dc4139 | 3566 | + path_get(&br->br_path); |
b752ccd1 | 3567 | + goto out; /* success */ |
1facf9fc | 3568 | + |
4f0767ce | 3569 | +out_err: |
86dc4139 | 3570 | + memset(&br->br_path, 0, sizeof(br->br_path)); |
4f0767ce | 3571 | +out: |
1facf9fc | 3572 | + return err; |
3573 | +} | |
3574 | + | |
3575 | +static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3576 | + struct au_branch *br, aufs_bindex_t bbot, |
1facf9fc | 3577 | + aufs_bindex_t amount) |
3578 | +{ | |
3579 | + struct au_branch **brp; | |
3580 | + | |
dece6358 AM |
3581 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
3582 | + | |
1facf9fc | 3583 | + brp = sbinfo->si_branch + bindex; |
3584 | + memmove(brp + 1, brp, sizeof(*brp) * amount); | |
3585 | + *brp = br; | |
5afbbe0d AM |
3586 | + sbinfo->si_bbot++; |
3587 | + if (unlikely(bbot < 0)) | |
3588 | + sbinfo->si_bbot = 0; | |
1facf9fc | 3589 | +} |
3590 | + | |
3591 | +static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3592 | + aufs_bindex_t bbot, aufs_bindex_t amount) |
1facf9fc | 3593 | +{ |
3594 | + struct au_hdentry *hdp; | |
3595 | + | |
1308ab2a | 3596 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
3597 | + | |
5afbbe0d | 3598 | + hdp = au_hdentry(dinfo, bindex); |
1facf9fc | 3599 | + memmove(hdp + 1, hdp, sizeof(*hdp) * amount); |
3600 | + au_h_dentry_init(hdp); | |
5afbbe0d AM |
3601 | + dinfo->di_bbot++; |
3602 | + if (unlikely(bbot < 0)) | |
3603 | + dinfo->di_btop = 0; | |
1facf9fc | 3604 | +} |
3605 | + | |
3606 | +static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex, | |
5afbbe0d | 3607 | + aufs_bindex_t bbot, aufs_bindex_t amount) |
1facf9fc | 3608 | +{ |
3609 | + struct au_hinode *hip; | |
3610 | + | |
1308ab2a | 3611 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
3612 | + | |
5afbbe0d | 3613 | + hip = au_hinode(iinfo, bindex); |
1facf9fc | 3614 | + memmove(hip + 1, hip, sizeof(*hip) * amount); |
5afbbe0d AM |
3615 | + au_hinode_init(hip); |
3616 | + iinfo->ii_bbot++; | |
3617 | + if (unlikely(bbot < 0)) | |
3618 | + iinfo->ii_btop = 0; | |
1facf9fc | 3619 | +} |
3620 | + | |
86dc4139 AM |
3621 | +static void au_br_do_add(struct super_block *sb, struct au_branch *br, |
3622 | + aufs_bindex_t bindex) | |
1facf9fc | 3623 | +{ |
86dc4139 | 3624 | + struct dentry *root, *h_dentry; |
5527c038 | 3625 | + struct inode *root_inode, *h_inode; |
5afbbe0d | 3626 | + aufs_bindex_t bbot, amount; |
1facf9fc | 3627 | + |
3628 | + root = sb->s_root; | |
5527c038 | 3629 | + root_inode = d_inode(root); |
5afbbe0d AM |
3630 | + bbot = au_sbbot(sb); |
3631 | + amount = bbot + 1 - bindex; | |
86dc4139 | 3632 | + h_dentry = au_br_dentry(br); |
53392da6 | 3633 | + au_sbilist_lock(); |
5afbbe0d AM |
3634 | + au_br_do_add_brp(au_sbi(sb), bindex, br, bbot, amount); |
3635 | + au_br_do_add_hdp(au_di(root), bindex, bbot, amount); | |
3636 | + au_br_do_add_hip(au_ii(root_inode), bindex, bbot, amount); | |
1facf9fc | 3637 | + au_set_h_dptr(root, bindex, dget(h_dentry)); |
5527c038 JR |
3638 | + h_inode = d_inode(h_dentry); |
3639 | + au_set_h_iptr(root_inode, bindex, au_igrab(h_inode), /*flags*/0); | |
53392da6 | 3640 | + au_sbilist_unlock(); |
1facf9fc | 3641 | +} |
3642 | + | |
3643 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
3644 | +{ | |
3645 | + int err; | |
5afbbe0d | 3646 | + aufs_bindex_t bbot, add_bindex; |
1facf9fc | 3647 | + struct dentry *root, *h_dentry; |
3648 | + struct inode *root_inode; | |
3649 | + struct au_branch *add_branch; | |
062440b3 | 3650 | + struct file *xf; |
1facf9fc | 3651 | + |
3652 | + root = sb->s_root; | |
5527c038 | 3653 | + root_inode = d_inode(root); |
1facf9fc | 3654 | + IMustLock(root_inode); |
5afbbe0d | 3655 | + IiMustWriteLock(root_inode); |
1facf9fc | 3656 | + err = test_add(sb, add, remount); |
3657 | + if (unlikely(err < 0)) | |
3658 | + goto out; | |
3659 | + if (err) { | |
3660 | + err = 0; | |
3661 | + goto out; /* success */ | |
3662 | + } | |
3663 | + | |
5afbbe0d AM |
3664 | + bbot = au_sbbot(sb); |
3665 | + add_branch = au_br_alloc(sb, bbot + 2, add->perm); | |
1facf9fc | 3666 | + err = PTR_ERR(add_branch); |
3667 | + if (IS_ERR(add_branch)) | |
3668 | + goto out; | |
3669 | + | |
3670 | + err = au_br_init(add_branch, sb, add); | |
3671 | + if (unlikely(err)) { | |
3672 | + au_br_do_free(add_branch); | |
3673 | + goto out; | |
3674 | + } | |
3675 | + | |
3676 | + add_bindex = add->bindex; | |
062440b3 AM |
3677 | + sysaufs_brs_del(sb, add_bindex); /* remove successors */ |
3678 | + au_br_do_add(sb, add_branch, add_bindex); | |
3679 | + sysaufs_brs_add(sb, add_bindex); /* append successors */ | |
3680 | + dbgaufs_brs_add(sb, add_bindex, /*topdown*/0); /* rename successors */ | |
1facf9fc | 3681 | + |
86dc4139 | 3682 | + h_dentry = add->path.dentry; |
1308ab2a | 3683 | + if (!add_bindex) { |
1facf9fc | 3684 | + au_cpup_attr_all(root_inode, /*force*/1); |
1308ab2a | 3685 | + sb->s_maxbytes = h_dentry->d_sb->s_maxbytes; |
3686 | + } else | |
5527c038 | 3687 | + au_add_nlink(root_inode, d_inode(h_dentry)); |
1facf9fc | 3688 | + |
3689 | + /* | |
062440b3 | 3690 | + * this test/set prevents aufs from handling unnecessary notify events |
027c5e7a | 3691 | + * of xino files, in case of re-adding a writable branch which was |
1facf9fc | 3692 | + * once detached from aufs. |
3693 | + */ | |
3694 | + if (au_xino_brid(sb) < 0 | |
3695 | + && au_br_writable(add_branch->br_perm) | |
062440b3 AM |
3696 | + && !au_test_fs_bad_xino(h_dentry->d_sb)) { |
3697 | + xf = au_xino_file(add_branch); | |
3698 | + if (xf && xf->f_path.dentry->d_parent == h_dentry) | |
3699 | + au_xino_brid_set(sb, add_branch->br_id); | |
3700 | + } | |
1facf9fc | 3701 | + |
4f0767ce | 3702 | +out: |
1facf9fc | 3703 | + return err; |
3704 | +} | |
3705 | + | |
3706 | +/* ---------------------------------------------------------------------- */ | |
3707 | + | |
79b8bda9 | 3708 | +static unsigned long long au_farray_cb(struct super_block *sb, void *a, |
076b876e AM |
3709 | + unsigned long long max __maybe_unused, |
3710 | + void *arg) | |
3711 | +{ | |
3712 | + unsigned long long n; | |
3713 | + struct file **p, *f; | |
8b6a4947 AM |
3714 | + struct hlist_bl_head *files; |
3715 | + struct hlist_bl_node *pos; | |
076b876e | 3716 | + struct au_finfo *finfo; |
076b876e AM |
3717 | + |
3718 | + n = 0; | |
3719 | + p = a; | |
3720 | + files = &au_sbi(sb)->si_files; | |
8b6a4947 AM |
3721 | + hlist_bl_lock(files); |
3722 | + hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { | |
076b876e AM |
3723 | + f = finfo->fi_file; |
3724 | + if (file_count(f) | |
3725 | + && !special_file(file_inode(f)->i_mode)) { | |
3726 | + get_file(f); | |
3727 | + *p++ = f; | |
3728 | + n++; | |
3729 | + AuDebugOn(n > max); | |
3730 | + } | |
3731 | + } | |
8b6a4947 | 3732 | + hlist_bl_unlock(files); |
076b876e AM |
3733 | + |
3734 | + return n; | |
3735 | +} | |
3736 | + | |
3737 | +static struct file **au_farray_alloc(struct super_block *sb, | |
3738 | + unsigned long long *max) | |
3739 | +{ | |
5afbbe0d | 3740 | + *max = au_nfiles(sb); |
79b8bda9 | 3741 | + return au_array_alloc(max, au_farray_cb, sb, /*arg*/NULL); |
076b876e AM |
3742 | +} |
3743 | + | |
3744 | +static void au_farray_free(struct file **a, unsigned long long max) | |
3745 | +{ | |
3746 | + unsigned long long ull; | |
3747 | + | |
3748 | + for (ull = 0; ull < max; ull++) | |
3749 | + if (a[ull]) | |
3750 | + fput(a[ull]); | |
be52b249 | 3751 | + kvfree(a); |
076b876e AM |
3752 | +} |
3753 | + | |
3754 | +/* ---------------------------------------------------------------------- */ | |
3755 | + | |
1facf9fc | 3756 | +/* |
3757 | + * delete a branch | |
3758 | + */ | |
3759 | + | |
3760 | +/* to show the line number, do not make it inlined function */ | |
4a4d8108 | 3761 | +#define AuVerbose(do_info, fmt, ...) do { \ |
1facf9fc | 3762 | + if (do_info) \ |
4a4d8108 | 3763 | + pr_info(fmt, ##__VA_ARGS__); \ |
1facf9fc | 3764 | +} while (0) |
3765 | + | |
5afbbe0d AM |
3766 | +static int au_test_ibusy(struct inode *inode, aufs_bindex_t btop, |
3767 | + aufs_bindex_t bbot) | |
027c5e7a | 3768 | +{ |
5afbbe0d | 3769 | + return (inode && !S_ISDIR(inode->i_mode)) || btop == bbot; |
027c5e7a AM |
3770 | +} |
3771 | + | |
5afbbe0d AM |
3772 | +static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t btop, |
3773 | + aufs_bindex_t bbot) | |
027c5e7a | 3774 | +{ |
5afbbe0d | 3775 | + return au_test_ibusy(d_inode(dentry), btop, bbot); |
027c5e7a AM |
3776 | +} |
3777 | + | |
1facf9fc | 3778 | +/* |
3779 | + * test if the branch is deletable or not. | |
3780 | + */ | |
3781 | +static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex, | |
b752ccd1 | 3782 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 3783 | +{ |
3784 | + int err, i, j, ndentry; | |
5afbbe0d | 3785 | + aufs_bindex_t btop, bbot; |
1facf9fc | 3786 | + struct au_dcsub_pages dpages; |
3787 | + struct au_dpage *dpage; | |
3788 | + struct dentry *d; | |
1facf9fc | 3789 | + |
3790 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
3791 | + if (unlikely(err)) | |
3792 | + goto out; | |
3793 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); | |
3794 | + if (unlikely(err)) | |
3795 | + goto out_dpages; | |
3796 | + | |
1facf9fc | 3797 | + for (i = 0; !err && i < dpages.ndpage; i++) { |
3798 | + dpage = dpages.dpages + i; | |
3799 | + ndentry = dpage->ndentry; | |
3800 | + for (j = 0; !err && j < ndentry; j++) { | |
3801 | + d = dpage->dentries[j]; | |
c1595e42 | 3802 | + AuDebugOn(au_dcount(d) <= 0); |
027c5e7a | 3803 | + if (!au_digen_test(d, sigen)) { |
1facf9fc | 3804 | + di_read_lock_child(d, AuLock_IR); |
027c5e7a AM |
3805 | + if (unlikely(au_dbrange_test(d))) { |
3806 | + di_read_unlock(d, AuLock_IR); | |
3807 | + continue; | |
3808 | + } | |
3809 | + } else { | |
1facf9fc | 3810 | + di_write_lock_child(d); |
027c5e7a AM |
3811 | + if (unlikely(au_dbrange_test(d))) { |
3812 | + di_write_unlock(d); | |
3813 | + continue; | |
3814 | + } | |
1facf9fc | 3815 | + err = au_reval_dpath(d, sigen); |
3816 | + if (!err) | |
3817 | + di_downgrade_lock(d, AuLock_IR); | |
3818 | + else { | |
3819 | + di_write_unlock(d); | |
3820 | + break; | |
3821 | + } | |
3822 | + } | |
3823 | + | |
027c5e7a | 3824 | + /* AuDbgDentry(d); */ |
5afbbe0d AM |
3825 | + btop = au_dbtop(d); |
3826 | + bbot = au_dbbot(d); | |
3827 | + if (btop <= bindex | |
3828 | + && bindex <= bbot | |
1facf9fc | 3829 | + && au_h_dptr(d, bindex) |
5afbbe0d | 3830 | + && au_test_dbusy(d, btop, bbot)) { |
1facf9fc | 3831 | + err = -EBUSY; |
523b37e3 | 3832 | + AuVerbose(verbose, "busy %pd\n", d); |
027c5e7a | 3833 | + AuDbgDentry(d); |
1facf9fc | 3834 | + } |
3835 | + di_read_unlock(d, AuLock_IR); | |
3836 | + } | |
3837 | + } | |
3838 | + | |
4f0767ce | 3839 | +out_dpages: |
1facf9fc | 3840 | + au_dpages_free(&dpages); |
4f0767ce | 3841 | +out: |
1facf9fc | 3842 | + return err; |
3843 | +} | |
3844 | + | |
3845 | +static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, | |
b752ccd1 | 3846 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 3847 | +{ |
3848 | + int err; | |
7f207e10 AM |
3849 | + unsigned long long max, ull; |
3850 | + struct inode *i, **array; | |
5afbbe0d | 3851 | + aufs_bindex_t btop, bbot; |
1facf9fc | 3852 | + |
7f207e10 AM |
3853 | + array = au_iarray_alloc(sb, &max); |
3854 | + err = PTR_ERR(array); | |
3855 | + if (IS_ERR(array)) | |
3856 | + goto out; | |
3857 | + | |
1facf9fc | 3858 | + err = 0; |
7f207e10 AM |
3859 | + AuDbg("b%d\n", bindex); |
3860 | + for (ull = 0; !err && ull < max; ull++) { | |
3861 | + i = array[ull]; | |
076b876e AM |
3862 | + if (unlikely(!i)) |
3863 | + break; | |
7f207e10 | 3864 | + if (i->i_ino == AUFS_ROOT_INO) |
1facf9fc | 3865 | + continue; |
3866 | + | |
7f207e10 | 3867 | + /* AuDbgInode(i); */ |
537831f9 | 3868 | + if (au_iigen(i, NULL) == sigen) |
1facf9fc | 3869 | + ii_read_lock_child(i); |
3870 | + else { | |
3871 | + ii_write_lock_child(i); | |
027c5e7a AM |
3872 | + err = au_refresh_hinode_self(i); |
3873 | + au_iigen_dec(i); | |
1facf9fc | 3874 | + if (!err) |
3875 | + ii_downgrade_lock(i); | |
3876 | + else { | |
3877 | + ii_write_unlock(i); | |
3878 | + break; | |
3879 | + } | |
3880 | + } | |
3881 | + | |
5afbbe0d AM |
3882 | + btop = au_ibtop(i); |
3883 | + bbot = au_ibbot(i); | |
3884 | + if (btop <= bindex | |
3885 | + && bindex <= bbot | |
1facf9fc | 3886 | + && au_h_iptr(i, bindex) |
5afbbe0d | 3887 | + && au_test_ibusy(i, btop, bbot)) { |
1facf9fc | 3888 | + err = -EBUSY; |
3889 | + AuVerbose(verbose, "busy i%lu\n", i->i_ino); | |
7f207e10 | 3890 | + AuDbgInode(i); |
1facf9fc | 3891 | + } |
3892 | + ii_read_unlock(i); | |
3893 | + } | |
7f207e10 | 3894 | + au_iarray_free(array, max); |
1facf9fc | 3895 | + |
7f207e10 | 3896 | +out: |
1facf9fc | 3897 | + return err; |
3898 | +} | |
3899 | + | |
b752ccd1 AM |
3900 | +static int test_children_busy(struct dentry *root, aufs_bindex_t bindex, |
3901 | + const unsigned int verbose) | |
1facf9fc | 3902 | +{ |
3903 | + int err; | |
3904 | + unsigned int sigen; | |
3905 | + | |
3906 | + sigen = au_sigen(root->d_sb); | |
3907 | + DiMustNoWaiters(root); | |
5527c038 | 3908 | + IiMustNoWaiters(d_inode(root)); |
1facf9fc | 3909 | + di_write_unlock(root); |
b752ccd1 | 3910 | + err = test_dentry_busy(root, bindex, sigen, verbose); |
1facf9fc | 3911 | + if (!err) |
b752ccd1 | 3912 | + err = test_inode_busy(root->d_sb, bindex, sigen, verbose); |
1facf9fc | 3913 | + di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */ |
3914 | + | |
3915 | + return err; | |
3916 | +} | |
3917 | + | |
076b876e AM |
3918 | +static int test_dir_busy(struct file *file, aufs_bindex_t br_id, |
3919 | + struct file **to_free, int *idx) | |
3920 | +{ | |
3921 | + int err; | |
c1595e42 | 3922 | + unsigned char matched, root; |
5afbbe0d | 3923 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
3924 | + struct au_fidir *fidir; |
3925 | + struct au_hfile *hfile; | |
3926 | + | |
3927 | + err = 0; | |
2000de60 | 3928 | + root = IS_ROOT(file->f_path.dentry); |
c1595e42 JR |
3929 | + if (root) { |
3930 | + get_file(file); | |
3931 | + to_free[*idx] = file; | |
3932 | + (*idx)++; | |
3933 | + goto out; | |
3934 | + } | |
3935 | + | |
076b876e | 3936 | + matched = 0; |
076b876e AM |
3937 | + fidir = au_fi(file)->fi_hdir; |
3938 | + AuDebugOn(!fidir); | |
5afbbe0d AM |
3939 | + bbot = au_fbbot_dir(file); |
3940 | + for (bindex = au_fbtop(file); bindex <= bbot; bindex++) { | |
076b876e AM |
3941 | + hfile = fidir->fd_hfile + bindex; |
3942 | + if (!hfile->hf_file) | |
3943 | + continue; | |
3944 | + | |
c1595e42 | 3945 | + if (hfile->hf_br->br_id == br_id) { |
076b876e | 3946 | + matched = 1; |
076b876e | 3947 | + break; |
c1595e42 | 3948 | + } |
076b876e | 3949 | + } |
c1595e42 | 3950 | + if (matched) |
076b876e AM |
3951 | + err = -EBUSY; |
3952 | + | |
3953 | +out: | |
3954 | + return err; | |
3955 | +} | |
3956 | + | |
3957 | +static int test_file_busy(struct super_block *sb, aufs_bindex_t br_id, | |
3958 | + struct file **to_free, int opened) | |
3959 | +{ | |
3960 | + int err, idx; | |
3961 | + unsigned long long ull, max; | |
5afbbe0d | 3962 | + aufs_bindex_t btop; |
076b876e | 3963 | + struct file *file, **array; |
076b876e AM |
3964 | + struct dentry *root; |
3965 | + struct au_hfile *hfile; | |
3966 | + | |
3967 | + array = au_farray_alloc(sb, &max); | |
3968 | + err = PTR_ERR(array); | |
3969 | + if (IS_ERR(array)) | |
3970 | + goto out; | |
3971 | + | |
3972 | + err = 0; | |
3973 | + idx = 0; | |
3974 | + root = sb->s_root; | |
3975 | + di_write_unlock(root); | |
3976 | + for (ull = 0; ull < max; ull++) { | |
3977 | + file = array[ull]; | |
3978 | + if (unlikely(!file)) | |
3979 | + break; | |
3980 | + | |
3981 | + /* AuDbg("%pD\n", file); */ | |
3982 | + fi_read_lock(file); | |
5afbbe0d | 3983 | + btop = au_fbtop(file); |
2000de60 | 3984 | + if (!d_is_dir(file->f_path.dentry)) { |
076b876e AM |
3985 | + hfile = &au_fi(file)->fi_htop; |
3986 | + if (hfile->hf_br->br_id == br_id) | |
3987 | + err = -EBUSY; | |
3988 | + } else | |
3989 | + err = test_dir_busy(file, br_id, to_free, &idx); | |
3990 | + fi_read_unlock(file); | |
3991 | + if (unlikely(err)) | |
3992 | + break; | |
3993 | + } | |
3994 | + di_write_lock_child(root); | |
3995 | + au_farray_free(array, max); | |
3996 | + AuDebugOn(idx > opened); | |
3997 | + | |
3998 | +out: | |
3999 | + return err; | |
4000 | +} | |
4001 | + | |
4002 | +static void br_del_file(struct file **to_free, unsigned long long opened, | |
062440b3 | 4003 | + aufs_bindex_t br_id) |
076b876e AM |
4004 | +{ |
4005 | + unsigned long long ull; | |
5afbbe0d | 4006 | + aufs_bindex_t bindex, btop, bbot, bfound; |
076b876e AM |
4007 | + struct file *file; |
4008 | + struct au_fidir *fidir; | |
4009 | + struct au_hfile *hfile; | |
4010 | + | |
4011 | + for (ull = 0; ull < opened; ull++) { | |
4012 | + file = to_free[ull]; | |
4013 | + if (unlikely(!file)) | |
4014 | + break; | |
4015 | + | |
4016 | + /* AuDbg("%pD\n", file); */ | |
2000de60 | 4017 | + AuDebugOn(!d_is_dir(file->f_path.dentry)); |
076b876e AM |
4018 | + bfound = -1; |
4019 | + fidir = au_fi(file)->fi_hdir; | |
4020 | + AuDebugOn(!fidir); | |
4021 | + fi_write_lock(file); | |
5afbbe0d AM |
4022 | + btop = au_fbtop(file); |
4023 | + bbot = au_fbbot_dir(file); | |
4024 | + for (bindex = btop; bindex <= bbot; bindex++) { | |
076b876e AM |
4025 | + hfile = fidir->fd_hfile + bindex; |
4026 | + if (!hfile->hf_file) | |
4027 | + continue; | |
4028 | + | |
4029 | + if (hfile->hf_br->br_id == br_id) { | |
4030 | + bfound = bindex; | |
4031 | + break; | |
4032 | + } | |
4033 | + } | |
4034 | + AuDebugOn(bfound < 0); | |
4035 | + au_set_h_fptr(file, bfound, NULL); | |
5afbbe0d AM |
4036 | + if (bfound == btop) { |
4037 | + for (btop++; btop <= bbot; btop++) | |
4038 | + if (au_hf_dir(file, btop)) { | |
4039 | + au_set_fbtop(file, btop); | |
076b876e AM |
4040 | + break; |
4041 | + } | |
4042 | + } | |
4043 | + fi_write_unlock(file); | |
4044 | + } | |
4045 | +} | |
4046 | + | |
1facf9fc | 4047 | +static void au_br_do_del_brp(struct au_sbinfo *sbinfo, |
4048 | + const aufs_bindex_t bindex, | |
5afbbe0d | 4049 | + const aufs_bindex_t bbot) |
1facf9fc | 4050 | +{ |
4051 | + struct au_branch **brp, **p; | |
4052 | + | |
dece6358 AM |
4053 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
4054 | + | |
1facf9fc | 4055 | + brp = sbinfo->si_branch + bindex; |
5afbbe0d AM |
4056 | + if (bindex < bbot) |
4057 | + memmove(brp, brp + 1, sizeof(*brp) * (bbot - bindex)); | |
4058 | + sbinfo->si_branch[0 + bbot] = NULL; | |
4059 | + sbinfo->si_bbot--; | |
1facf9fc | 4060 | + |
e2f27e51 AM |
4061 | + p = au_krealloc(sbinfo->si_branch, sizeof(*p) * bbot, AuGFP_SBILIST, |
4062 | + /*may_shrink*/1); | |
1facf9fc | 4063 | + if (p) |
4064 | + sbinfo->si_branch = p; | |
4a4d8108 | 4065 | + /* harmless error */ |
1facf9fc | 4066 | +} |
4067 | + | |
4068 | +static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex, | |
5afbbe0d | 4069 | + const aufs_bindex_t bbot) |
1facf9fc | 4070 | +{ |
4071 | + struct au_hdentry *hdp, *p; | |
4072 | + | |
1308ab2a | 4073 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
4074 | + | |
5afbbe0d AM |
4075 | + hdp = au_hdentry(dinfo, bindex); |
4076 | + if (bindex < bbot) | |
4077 | + memmove(hdp, hdp + 1, sizeof(*hdp) * (bbot - bindex)); | |
4078 | + /* au_h_dentry_init(au_hdentry(dinfo, bbot); */ | |
4079 | + dinfo->di_bbot--; | |
1facf9fc | 4080 | + |
e2f27e51 AM |
4081 | + p = au_krealloc(dinfo->di_hdentry, sizeof(*p) * bbot, AuGFP_SBILIST, |
4082 | + /*may_shrink*/1); | |
1facf9fc | 4083 | + if (p) |
4084 | + dinfo->di_hdentry = p; | |
4a4d8108 | 4085 | + /* harmless error */ |
1facf9fc | 4086 | +} |
4087 | + | |
4088 | +static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex, | |
5afbbe0d | 4089 | + const aufs_bindex_t bbot) |
1facf9fc | 4090 | +{ |
4091 | + struct au_hinode *hip, *p; | |
4092 | + | |
1308ab2a | 4093 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
4094 | + | |
5afbbe0d AM |
4095 | + hip = au_hinode(iinfo, bindex); |
4096 | + if (bindex < bbot) | |
4097 | + memmove(hip, hip + 1, sizeof(*hip) * (bbot - bindex)); | |
4098 | + /* au_hinode_init(au_hinode(iinfo, bbot)); */ | |
4099 | + iinfo->ii_bbot--; | |
1facf9fc | 4100 | + |
e2f27e51 AM |
4101 | + p = au_krealloc(iinfo->ii_hinode, sizeof(*p) * bbot, AuGFP_SBILIST, |
4102 | + /*may_shrink*/1); | |
1facf9fc | 4103 | + if (p) |
4104 | + iinfo->ii_hinode = p; | |
4a4d8108 | 4105 | + /* harmless error */ |
1facf9fc | 4106 | +} |
4107 | + | |
4108 | +static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex, | |
4109 | + struct au_branch *br) | |
4110 | +{ | |
5afbbe0d | 4111 | + aufs_bindex_t bbot; |
1facf9fc | 4112 | + struct au_sbinfo *sbinfo; |
53392da6 AM |
4113 | + struct dentry *root, *h_root; |
4114 | + struct inode *inode, *h_inode; | |
4115 | + struct au_hinode *hinode; | |
1facf9fc | 4116 | + |
dece6358 AM |
4117 | + SiMustWriteLock(sb); |
4118 | + | |
1facf9fc | 4119 | + root = sb->s_root; |
5527c038 | 4120 | + inode = d_inode(root); |
1facf9fc | 4121 | + sbinfo = au_sbi(sb); |
5afbbe0d | 4122 | + bbot = sbinfo->si_bbot; |
1facf9fc | 4123 | + |
53392da6 AM |
4124 | + h_root = au_h_dptr(root, bindex); |
4125 | + hinode = au_hi(inode, bindex); | |
4126 | + h_inode = au_igrab(hinode->hi_inode); | |
4127 | + au_hiput(hinode); | |
1facf9fc | 4128 | + |
53392da6 | 4129 | + au_sbilist_lock(); |
5afbbe0d AM |
4130 | + au_br_do_del_brp(sbinfo, bindex, bbot); |
4131 | + au_br_do_del_hdp(au_di(root), bindex, bbot); | |
4132 | + au_br_do_del_hip(au_ii(inode), bindex, bbot); | |
53392da6 AM |
4133 | + au_sbilist_unlock(); |
4134 | + | |
8b6a4947 AM |
4135 | + /* ignore an error */ |
4136 | + au_dr_br_fin(sb, br); /* always, regardless the mount option */ | |
4137 | + | |
53392da6 AM |
4138 | + dput(h_root); |
4139 | + iput(h_inode); | |
4140 | + au_br_do_free(br); | |
1facf9fc | 4141 | +} |
4142 | + | |
79b8bda9 AM |
4143 | +static unsigned long long empty_cb(struct super_block *sb, void *array, |
4144 | + unsigned long long max, void *arg) | |
076b876e AM |
4145 | +{ |
4146 | + return max; | |
4147 | +} | |
4148 | + | |
1facf9fc | 4149 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount) |
4150 | +{ | |
4151 | + int err, rerr, i; | |
076b876e | 4152 | + unsigned long long opened; |
1facf9fc | 4153 | + unsigned int mnt_flags; |
5afbbe0d | 4154 | + aufs_bindex_t bindex, bbot, br_id; |
1facf9fc | 4155 | + unsigned char do_wh, verbose; |
4156 | + struct au_branch *br; | |
4157 | + struct au_wbr *wbr; | |
076b876e AM |
4158 | + struct dentry *root; |
4159 | + struct file **to_free; | |
1facf9fc | 4160 | + |
4161 | + err = 0; | |
076b876e AM |
4162 | + opened = 0; |
4163 | + to_free = NULL; | |
4164 | + root = sb->s_root; | |
4165 | + bindex = au_find_dbindex(root, del->h_path.dentry); | |
1facf9fc | 4166 | + if (bindex < 0) { |
4167 | + if (remount) | |
4168 | + goto out; /* success */ | |
4169 | + err = -ENOENT; | |
4a4d8108 | 4170 | + pr_err("%s no such branch\n", del->pathname); |
1facf9fc | 4171 | + goto out; |
4172 | + } | |
4173 | + AuDbg("bindex b%d\n", bindex); | |
4174 | + | |
4175 | + err = -EBUSY; | |
4176 | + mnt_flags = au_mntflags(sb); | |
4177 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
5afbbe0d AM |
4178 | + bbot = au_sbbot(sb); |
4179 | + if (unlikely(!bbot)) { | |
1facf9fc | 4180 | + AuVerbose(verbose, "no more branches left\n"); |
4181 | + goto out; | |
4182 | + } | |
4183 | + br = au_sbr(sb, bindex); | |
86dc4139 | 4184 | + AuDebugOn(!path_equal(&br->br_path, &del->h_path)); |
076b876e AM |
4185 | + |
4186 | + br_id = br->br_id; | |
5afbbe0d | 4187 | + opened = au_br_count(br); |
076b876e | 4188 | + if (unlikely(opened)) { |
79b8bda9 | 4189 | + to_free = au_array_alloc(&opened, empty_cb, sb, NULL); |
076b876e AM |
4190 | + err = PTR_ERR(to_free); |
4191 | + if (IS_ERR(to_free)) | |
4192 | + goto out; | |
4193 | + | |
4194 | + err = test_file_busy(sb, br_id, to_free, opened); | |
4195 | + if (unlikely(err)) { | |
4196 | + AuVerbose(verbose, "%llu file(s) opened\n", opened); | |
4197 | + goto out; | |
4198 | + } | |
1facf9fc | 4199 | + } |
4200 | + | |
4201 | + wbr = br->br_wbr; | |
4202 | + do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph); | |
4203 | + if (do_wh) { | |
1308ab2a | 4204 | + /* instead of WbrWhMustWriteLock(wbr) */ |
4205 | + SiMustWriteLock(sb); | |
1facf9fc | 4206 | + for (i = 0; i < AuBrWh_Last; i++) { |
4207 | + dput(wbr->wbr_wh[i]); | |
4208 | + wbr->wbr_wh[i] = NULL; | |
4209 | + } | |
4210 | + } | |
4211 | + | |
076b876e | 4212 | + err = test_children_busy(root, bindex, verbose); |
1facf9fc | 4213 | + if (unlikely(err)) { |
4214 | + if (do_wh) | |
4215 | + goto out_wh; | |
4216 | + goto out; | |
4217 | + } | |
4218 | + | |
4219 | + err = 0; | |
076b876e AM |
4220 | + if (to_free) { |
4221 | + /* | |
4222 | + * now we confirmed the branch is deletable. | |
4223 | + * let's free the remaining opened dirs on the branch. | |
4224 | + */ | |
4225 | + di_write_unlock(root); | |
4226 | + br_del_file(to_free, opened, br_id); | |
4227 | + di_write_lock_child(root); | |
4228 | + } | |
4229 | + | |
062440b3 AM |
4230 | + sysaufs_brs_del(sb, bindex); /* remove successors */ |
4231 | + dbgaufs_xino_del(br); /* remove one */ | |
4232 | + au_br_do_del(sb, bindex, br); | |
4233 | + sysaufs_brs_add(sb, bindex); /* append successors */ | |
4234 | + dbgaufs_brs_add(sb, bindex, /*topdown*/1); /* rename successors */ | |
1facf9fc | 4235 | + |
1308ab2a | 4236 | + if (!bindex) { |
5527c038 | 4237 | + au_cpup_attr_all(d_inode(root), /*force*/1); |
1308ab2a | 4238 | + sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes; |
4239 | + } else | |
5527c038 | 4240 | + au_sub_nlink(d_inode(root), d_inode(del->h_path.dentry)); |
1facf9fc | 4241 | + if (au_opt_test(mnt_flags, PLINK)) |
4242 | + au_plink_half_refresh(sb, br_id); | |
4243 | + | |
b752ccd1 | 4244 | + if (au_xino_brid(sb) == br_id) |
1facf9fc | 4245 | + au_xino_brid_set(sb, -1); |
4246 | + goto out; /* success */ | |
4247 | + | |
4f0767ce | 4248 | +out_wh: |
1facf9fc | 4249 | + /* revert */ |
86dc4139 | 4250 | + rerr = au_br_init_wh(sb, br, br->br_perm); |
1facf9fc | 4251 | + if (rerr) |
0c3ec466 AM |
4252 | + pr_warn("failed re-creating base whiteout, %s. (%d)\n", |
4253 | + del->pathname, rerr); | |
4f0767ce | 4254 | +out: |
076b876e AM |
4255 | + if (to_free) |
4256 | + au_farray_free(to_free, opened); | |
1facf9fc | 4257 | + return err; |
4258 | +} | |
4259 | + | |
4260 | +/* ---------------------------------------------------------------------- */ | |
4261 | + | |
027c5e7a AM |
4262 | +static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg) |
4263 | +{ | |
4264 | + int err; | |
5afbbe0d | 4265 | + aufs_bindex_t btop, bbot; |
027c5e7a AM |
4266 | + struct aufs_ibusy ibusy; |
4267 | + struct inode *inode, *h_inode; | |
4268 | + | |
4269 | + err = -EPERM; | |
4270 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
4271 | + goto out; | |
4272 | + | |
4273 | + err = copy_from_user(&ibusy, arg, sizeof(ibusy)); | |
4274 | + if (!err) | |
4275 | + err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino)); | |
4276 | + if (unlikely(err)) { | |
4277 | + err = -EFAULT; | |
4278 | + AuTraceErr(err); | |
4279 | + goto out; | |
4280 | + } | |
4281 | + | |
4282 | + err = -EINVAL; | |
4283 | + si_read_lock(sb, AuLock_FLUSH); | |
5afbbe0d | 4284 | + if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbbot(sb))) |
027c5e7a AM |
4285 | + goto out_unlock; |
4286 | + | |
4287 | + err = 0; | |
4288 | + ibusy.h_ino = 0; /* invalid */ | |
4289 | + inode = ilookup(sb, ibusy.ino); | |
4290 | + if (!inode | |
4291 | + || inode->i_ino == AUFS_ROOT_INO | |
5afbbe0d | 4292 | + || au_is_bad_inode(inode)) |
027c5e7a AM |
4293 | + goto out_unlock; |
4294 | + | |
4295 | + ii_read_lock_child(inode); | |
5afbbe0d AM |
4296 | + btop = au_ibtop(inode); |
4297 | + bbot = au_ibbot(inode); | |
4298 | + if (btop <= ibusy.bindex && ibusy.bindex <= bbot) { | |
027c5e7a | 4299 | + h_inode = au_h_iptr(inode, ibusy.bindex); |
5afbbe0d | 4300 | + if (h_inode && au_test_ibusy(inode, btop, bbot)) |
027c5e7a AM |
4301 | + ibusy.h_ino = h_inode->i_ino; |
4302 | + } | |
4303 | + ii_read_unlock(inode); | |
4304 | + iput(inode); | |
4305 | + | |
4306 | +out_unlock: | |
4307 | + si_read_unlock(sb); | |
4308 | + if (!err) { | |
4309 | + err = __put_user(ibusy.h_ino, &arg->h_ino); | |
4310 | + if (unlikely(err)) { | |
4311 | + err = -EFAULT; | |
4312 | + AuTraceErr(err); | |
4313 | + } | |
4314 | + } | |
4315 | +out: | |
4316 | + return err; | |
4317 | +} | |
4318 | + | |
4319 | +long au_ibusy_ioctl(struct file *file, unsigned long arg) | |
4320 | +{ | |
2000de60 | 4321 | + return au_ibusy(file->f_path.dentry->d_sb, (void __user *)arg); |
027c5e7a AM |
4322 | +} |
4323 | + | |
4324 | +#ifdef CONFIG_COMPAT | |
4325 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg) | |
4326 | +{ | |
2000de60 | 4327 | + return au_ibusy(file->f_path.dentry->d_sb, compat_ptr(arg)); |
027c5e7a AM |
4328 | +} |
4329 | +#endif | |
4330 | + | |
4331 | +/* ---------------------------------------------------------------------- */ | |
4332 | + | |
1facf9fc | 4333 | +/* |
4334 | + * change a branch permission | |
4335 | + */ | |
4336 | + | |
dece6358 AM |
4337 | +static void au_warn_ima(void) |
4338 | +{ | |
4339 | +#ifdef CONFIG_IMA | |
1308ab2a | 4340 | + /* since it doesn't support mark_files_ro() */ |
027c5e7a | 4341 | + AuWarn1("RW -> RO makes IMA to produce wrong message\n"); |
dece6358 AM |
4342 | +#endif |
4343 | +} | |
4344 | + | |
1facf9fc | 4345 | +static int do_need_sigen_inc(int a, int b) |
4346 | +{ | |
4347 | + return au_br_whable(a) && !au_br_whable(b); | |
4348 | +} | |
4349 | + | |
4350 | +static int need_sigen_inc(int old, int new) | |
4351 | +{ | |
4352 | + return do_need_sigen_inc(old, new) | |
4353 | + || do_need_sigen_inc(new, old); | |
4354 | +} | |
4355 | + | |
4356 | +static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex) | |
4357 | +{ | |
7f207e10 | 4358 | + int err, do_warn; |
027c5e7a | 4359 | + unsigned int mnt_flags; |
7f207e10 | 4360 | + unsigned long long ull, max; |
e49829fe | 4361 | + aufs_bindex_t br_id; |
38d290e6 | 4362 | + unsigned char verbose, writer; |
7f207e10 | 4363 | + struct file *file, *hf, **array; |
e49829fe | 4364 | + struct au_hfile *hfile; |
1facf9fc | 4365 | + |
027c5e7a AM |
4366 | + mnt_flags = au_mntflags(sb); |
4367 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
4368 | + | |
7f207e10 AM |
4369 | + array = au_farray_alloc(sb, &max); |
4370 | + err = PTR_ERR(array); | |
4371 | + if (IS_ERR(array)) | |
1facf9fc | 4372 | + goto out; |
4373 | + | |
7f207e10 | 4374 | + do_warn = 0; |
e49829fe | 4375 | + br_id = au_sbr_id(sb, bindex); |
7f207e10 AM |
4376 | + for (ull = 0; ull < max; ull++) { |
4377 | + file = array[ull]; | |
076b876e AM |
4378 | + if (unlikely(!file)) |
4379 | + break; | |
1facf9fc | 4380 | + |
523b37e3 | 4381 | + /* AuDbg("%pD\n", file); */ |
1facf9fc | 4382 | + fi_read_lock(file); |
4383 | + if (unlikely(au_test_mmapped(file))) { | |
4384 | + err = -EBUSY; | |
523b37e3 | 4385 | + AuVerbose(verbose, "mmapped %pD\n", file); |
7f207e10 | 4386 | + AuDbgFile(file); |
1facf9fc | 4387 | + FiMustNoWaiters(file); |
4388 | + fi_read_unlock(file); | |
7f207e10 | 4389 | + goto out_array; |
1facf9fc | 4390 | + } |
4391 | + | |
e49829fe JR |
4392 | + hfile = &au_fi(file)->fi_htop; |
4393 | + hf = hfile->hf_file; | |
7e9cd9fe | 4394 | + if (!d_is_reg(file->f_path.dentry) |
1facf9fc | 4395 | + || !(file->f_mode & FMODE_WRITE) |
e49829fe | 4396 | + || hfile->hf_br->br_id != br_id |
7f207e10 AM |
4397 | + || !(hf->f_mode & FMODE_WRITE)) |
4398 | + array[ull] = NULL; | |
4399 | + else { | |
4400 | + do_warn = 1; | |
4401 | + get_file(file); | |
1facf9fc | 4402 | + } |
4403 | + | |
1facf9fc | 4404 | + FiMustNoWaiters(file); |
4405 | + fi_read_unlock(file); | |
7f207e10 AM |
4406 | + fput(file); |
4407 | + } | |
1facf9fc | 4408 | + |
4409 | + err = 0; | |
7f207e10 | 4410 | + if (do_warn) |
dece6358 | 4411 | + au_warn_ima(); |
7f207e10 AM |
4412 | + |
4413 | + for (ull = 0; ull < max; ull++) { | |
4414 | + file = array[ull]; | |
4415 | + if (!file) | |
4416 | + continue; | |
4417 | + | |
1facf9fc | 4418 | + /* todo: already flushed? */ |
523b37e3 AM |
4419 | + /* |
4420 | + * fs/super.c:mark_files_ro() is gone, but aufs keeps its | |
4421 | + * approach which resets f_mode and calls mnt_drop_write() and | |
4422 | + * file_release_write() for each file, because the branch | |
4423 | + * attribute in aufs world is totally different from the native | |
4424 | + * fs rw/ro mode. | |
4425 | + */ | |
7f207e10 AM |
4426 | + /* fi_read_lock(file); */ |
4427 | + hfile = &au_fi(file)->fi_htop; | |
4428 | + hf = hfile->hf_file; | |
4429 | + /* fi_read_unlock(file); */ | |
027c5e7a | 4430 | + spin_lock(&hf->f_lock); |
38d290e6 JR |
4431 | + writer = !!(hf->f_mode & FMODE_WRITER); |
4432 | + hf->f_mode &= ~(FMODE_WRITE | FMODE_WRITER); | |
027c5e7a | 4433 | + spin_unlock(&hf->f_lock); |
38d290e6 JR |
4434 | + if (writer) { |
4435 | + put_write_access(file_inode(hf)); | |
c06a8ce3 | 4436 | + __mnt_drop_write(hf->f_path.mnt); |
1facf9fc | 4437 | + } |
4438 | + } | |
4439 | + | |
7f207e10 AM |
4440 | +out_array: |
4441 | + au_farray_free(array, max); | |
4f0767ce | 4442 | +out: |
7f207e10 | 4443 | + AuTraceErr(err); |
1facf9fc | 4444 | + return err; |
4445 | +} | |
4446 | + | |
4447 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 4448 | + int *do_refresh) |
1facf9fc | 4449 | +{ |
4450 | + int err, rerr; | |
4451 | + aufs_bindex_t bindex; | |
4452 | + struct dentry *root; | |
4453 | + struct au_branch *br; | |
076b876e | 4454 | + struct au_br_fhsm *bf; |
1facf9fc | 4455 | + |
4456 | + root = sb->s_root; | |
1facf9fc | 4457 | + bindex = au_find_dbindex(root, mod->h_root); |
4458 | + if (bindex < 0) { | |
4459 | + if (remount) | |
4460 | + return 0; /* success */ | |
4461 | + err = -ENOENT; | |
4a4d8108 | 4462 | + pr_err("%s no such branch\n", mod->path); |
1facf9fc | 4463 | + goto out; |
4464 | + } | |
4465 | + AuDbg("bindex b%d\n", bindex); | |
4466 | + | |
5527c038 | 4467 | + err = test_br(d_inode(mod->h_root), mod->perm, mod->path); |
1facf9fc | 4468 | + if (unlikely(err)) |
4469 | + goto out; | |
4470 | + | |
4471 | + br = au_sbr(sb, bindex); | |
86dc4139 | 4472 | + AuDebugOn(mod->h_root != au_br_dentry(br)); |
1facf9fc | 4473 | + if (br->br_perm == mod->perm) |
4474 | + return 0; /* success */ | |
4475 | + | |
076b876e AM |
4476 | + /* pre-allocate for non-fhsm --> fhsm */ |
4477 | + bf = NULL; | |
4478 | + if (!au_br_fhsm(br->br_perm) && au_br_fhsm(mod->perm)) { | |
4479 | + err = au_fhsm_br_alloc(br); | |
4480 | + if (unlikely(err)) | |
4481 | + goto out; | |
4482 | + bf = br->br_fhsm; | |
4483 | + br->br_fhsm = NULL; | |
4484 | + } | |
4485 | + | |
1facf9fc | 4486 | + if (au_br_writable(br->br_perm)) { |
4487 | + /* remove whiteout base */ | |
86dc4139 | 4488 | + err = au_br_init_wh(sb, br, mod->perm); |
1facf9fc | 4489 | + if (unlikely(err)) |
076b876e | 4490 | + goto out_bf; |
1facf9fc | 4491 | + |
4492 | + if (!au_br_writable(mod->perm)) { | |
4493 | + /* rw --> ro, file might be mmapped */ | |
4494 | + DiMustNoWaiters(root); | |
5527c038 | 4495 | + IiMustNoWaiters(d_inode(root)); |
1facf9fc | 4496 | + di_write_unlock(root); |
4497 | + err = au_br_mod_files_ro(sb, bindex); | |
4498 | + /* aufs_write_lock() calls ..._child() */ | |
4499 | + di_write_lock_child(root); | |
4500 | + | |
4501 | + if (unlikely(err)) { | |
4502 | + rerr = -ENOMEM; | |
be52b249 | 4503 | + br->br_wbr = kzalloc(sizeof(*br->br_wbr), |
1facf9fc | 4504 | + GFP_NOFS); |
86dc4139 AM |
4505 | + if (br->br_wbr) |
4506 | + rerr = au_wbr_init(br, sb, br->br_perm); | |
1facf9fc | 4507 | + if (unlikely(rerr)) { |
4508 | + AuIOErr("nested error %d (%d)\n", | |
4509 | + rerr, err); | |
4510 | + br->br_perm = mod->perm; | |
4511 | + } | |
4512 | + } | |
4513 | + } | |
4514 | + } else if (au_br_writable(mod->perm)) { | |
4515 | + /* ro --> rw */ | |
4516 | + err = -ENOMEM; | |
be52b249 | 4517 | + br->br_wbr = kzalloc(sizeof(*br->br_wbr), GFP_NOFS); |
1facf9fc | 4518 | + if (br->br_wbr) { |
86dc4139 | 4519 | + err = au_wbr_init(br, sb, mod->perm); |
1facf9fc | 4520 | + if (unlikely(err)) { |
1c60b727 | 4521 | + kfree(br->br_wbr); |
1facf9fc | 4522 | + br->br_wbr = NULL; |
4523 | + } | |
4524 | + } | |
4525 | + } | |
076b876e AM |
4526 | + if (unlikely(err)) |
4527 | + goto out_bf; | |
4528 | + | |
4529 | + if (au_br_fhsm(br->br_perm)) { | |
4530 | + if (!au_br_fhsm(mod->perm)) { | |
4531 | + /* fhsm --> non-fhsm */ | |
4532 | + au_br_fhsm_fin(br->br_fhsm); | |
1c60b727 | 4533 | + kfree(br->br_fhsm); |
076b876e AM |
4534 | + br->br_fhsm = NULL; |
4535 | + } | |
4536 | + } else if (au_br_fhsm(mod->perm)) | |
4537 | + /* non-fhsm --> fhsm */ | |
4538 | + br->br_fhsm = bf; | |
4539 | + | |
076b876e AM |
4540 | + *do_refresh |= need_sigen_inc(br->br_perm, mod->perm); |
4541 | + br->br_perm = mod->perm; | |
4542 | + goto out; /* success */ | |
1facf9fc | 4543 | + |
076b876e | 4544 | +out_bf: |
8b6a4947 | 4545 | + kfree(bf); |
076b876e AM |
4546 | +out: |
4547 | + AuTraceErr(err); | |
4548 | + return err; | |
4549 | +} | |
4550 | + | |
4551 | +/* ---------------------------------------------------------------------- */ | |
4552 | + | |
4553 | +int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs) | |
4554 | +{ | |
4555 | + int err; | |
4556 | + struct kstatfs kstfs; | |
4557 | + | |
4558 | + err = vfs_statfs(&br->br_path, &kstfs); | |
1facf9fc | 4559 | + if (!err) { |
076b876e AM |
4560 | + stfs->f_blocks = kstfs.f_blocks; |
4561 | + stfs->f_bavail = kstfs.f_bavail; | |
4562 | + stfs->f_files = kstfs.f_files; | |
4563 | + stfs->f_ffree = kstfs.f_ffree; | |
1facf9fc | 4564 | + } |
4565 | + | |
1facf9fc | 4566 | + return err; |
4567 | +} | |
7f207e10 AM |
4568 | diff -urN /usr/share/empty/fs/aufs/branch.h linux/fs/aufs/branch.h |
4569 | --- /usr/share/empty/fs/aufs/branch.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 4570 | +++ linux/fs/aufs/branch.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
4571 | @@ -0,0 +1,374 @@ |
4572 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 4573 | +/* |
b00004a5 | 4574 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 4575 | + * |
4576 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4577 | + * it under the terms of the GNU General Public License as published by | |
4578 | + * the Free Software Foundation; either version 2 of the License, or | |
4579 | + * (at your option) any later version. | |
dece6358 AM |
4580 | + * |
4581 | + * This program is distributed in the hope that it will be useful, | |
4582 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4583 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4584 | + * GNU General Public License for more details. | |
4585 | + * | |
4586 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 4587 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 4588 | + */ |
4589 | + | |
4590 | +/* | |
4591 | + * branch filesystems and xino for them | |
4592 | + */ | |
4593 | + | |
4594 | +#ifndef __AUFS_BRANCH_H__ | |
4595 | +#define __AUFS_BRANCH_H__ | |
4596 | + | |
4597 | +#ifdef __KERNEL__ | |
4598 | + | |
1facf9fc | 4599 | +#include <linux/mount.h> |
8b6a4947 | 4600 | +#include "dirren.h" |
4a4d8108 | 4601 | +#include "dynop.h" |
1facf9fc | 4602 | +#include "rwsem.h" |
4603 | +#include "super.h" | |
4604 | + | |
4605 | +/* ---------------------------------------------------------------------- */ | |
4606 | + | |
4607 | +/* a xino file */ | |
062440b3 | 4608 | +struct au_xino { |
1facf9fc | 4609 | + struct file *xi_file; |
521ced18 JR |
4610 | + struct { |
4611 | + spinlock_t spin; | |
4612 | + ino_t *array; | |
4613 | + int total; | |
4614 | + /* reserved for future use */ | |
4615 | + /* unsigned long *bitmap; */ | |
4616 | + wait_queue_head_t wqh; | |
4617 | + } xi_nondir; | |
1facf9fc | 4618 | + |
062440b3 | 4619 | + atomic_t xi_truncating; |
1facf9fc | 4620 | + |
062440b3 AM |
4621 | + struct kref xi_kref; |
4622 | + | |
4623 | + /* todo: make xino files an array to support huge inode number */ | |
1facf9fc | 4624 | +}; |
4625 | + | |
076b876e AM |
4626 | +/* File-based Hierarchical Storage Management */ |
4627 | +struct au_br_fhsm { | |
4628 | +#ifdef CONFIG_AUFS_FHSM | |
4629 | + struct mutex bf_lock; | |
4630 | + unsigned long bf_jiffy; | |
4631 | + struct aufs_stfs bf_stfs; | |
4632 | + int bf_readable; | |
4633 | +#endif | |
4634 | +}; | |
4635 | + | |
1facf9fc | 4636 | +/* members for writable branch only */ |
4637 | +enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last}; | |
4638 | +struct au_wbr { | |
dece6358 | 4639 | + struct au_rwsem wbr_wh_rwsem; |
1facf9fc | 4640 | + struct dentry *wbr_wh[AuBrWh_Last]; |
4a4d8108 | 4641 | + atomic_t wbr_wh_running; |
1facf9fc | 4642 | +#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */ |
4643 | +#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */ | |
4644 | +#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */ | |
4645 | + | |
4646 | + /* mfs mode */ | |
4647 | + unsigned long long wbr_bytes; | |
4648 | +}; | |
4649 | + | |
4a4d8108 AM |
4650 | +/* ext2 has 3 types of operations at least, ext3 has 4 */ |
4651 | +#define AuBrDynOp (AuDyLast * 4) | |
4652 | + | |
1716fcea AM |
4653 | +#ifdef CONFIG_AUFS_HFSNOTIFY |
4654 | +/* support for asynchronous destruction */ | |
4655 | +struct au_br_hfsnotify { | |
4656 | + struct fsnotify_group *hfsn_group; | |
4657 | +}; | |
4658 | +#endif | |
4659 | + | |
392086de AM |
4660 | +/* sysfs entries */ |
4661 | +struct au_brsysfs { | |
4662 | + char name[16]; | |
4663 | + struct attribute attr; | |
4664 | +}; | |
4665 | + | |
4666 | +enum { | |
4667 | + AuBrSysfs_BR, | |
4668 | + AuBrSysfs_BRID, | |
4669 | + AuBrSysfs_Last | |
4670 | +}; | |
4671 | + | |
1facf9fc | 4672 | +/* protected by superblock rwsem */ |
4673 | +struct au_branch { | |
062440b3 | 4674 | + struct au_xino *br_xino; |
1facf9fc | 4675 | + |
4676 | + aufs_bindex_t br_id; | |
4677 | + | |
4678 | + int br_perm; | |
86dc4139 | 4679 | + struct path br_path; |
4a4d8108 AM |
4680 | + spinlock_t br_dykey_lock; |
4681 | + struct au_dykey *br_dykey[AuBrDynOp]; | |
5afbbe0d | 4682 | + struct percpu_counter br_count; |
1facf9fc | 4683 | + |
4684 | + struct au_wbr *br_wbr; | |
076b876e | 4685 | + struct au_br_fhsm *br_fhsm; |
1facf9fc | 4686 | + |
027c5e7a | 4687 | +#ifdef CONFIG_AUFS_HFSNOTIFY |
1716fcea | 4688 | + struct au_br_hfsnotify *br_hfsn; |
027c5e7a AM |
4689 | +#endif |
4690 | + | |
1facf9fc | 4691 | +#ifdef CONFIG_SYSFS |
392086de AM |
4692 | + /* entries under sysfs per mount-point */ |
4693 | + struct au_brsysfs br_sysfs[AuBrSysfs_Last]; | |
1facf9fc | 4694 | +#endif |
8b6a4947 | 4695 | + |
062440b3 AM |
4696 | +#ifdef CONFIG_DEBUG_FS |
4697 | + struct dentry *br_dbgaufs; /* xino */ | |
4698 | +#endif | |
4699 | + | |
8b6a4947 | 4700 | + struct au_dr_br br_dirren; |
1facf9fc | 4701 | +}; |
4702 | + | |
4703 | +/* ---------------------------------------------------------------------- */ | |
4704 | + | |
86dc4139 AM |
4705 | +static inline struct vfsmount *au_br_mnt(struct au_branch *br) |
4706 | +{ | |
4707 | + return br->br_path.mnt; | |
4708 | +} | |
4709 | + | |
4710 | +static inline struct dentry *au_br_dentry(struct au_branch *br) | |
4711 | +{ | |
4712 | + return br->br_path.dentry; | |
4713 | +} | |
4714 | + | |
4715 | +static inline struct super_block *au_br_sb(struct au_branch *br) | |
4716 | +{ | |
4717 | + return au_br_mnt(br)->mnt_sb; | |
4718 | +} | |
4719 | + | |
5afbbe0d AM |
4720 | +static inline void au_br_get(struct au_branch *br) |
4721 | +{ | |
4722 | + percpu_counter_inc(&br->br_count); | |
4723 | +} | |
4724 | + | |
4725 | +static inline void au_br_put(struct au_branch *br) | |
4726 | +{ | |
4727 | + percpu_counter_dec(&br->br_count); | |
4728 | +} | |
4729 | + | |
4730 | +static inline s64 au_br_count(struct au_branch *br) | |
4731 | +{ | |
4732 | + return percpu_counter_sum(&br->br_count); | |
4733 | +} | |
4734 | + | |
4735 | +static inline void au_br_count_init(struct au_branch *br) | |
4736 | +{ | |
4737 | + percpu_counter_init(&br->br_count, 0, GFP_NOFS); | |
4738 | +} | |
4739 | + | |
4740 | +static inline void au_br_count_fin(struct au_branch *br) | |
4741 | +{ | |
4742 | + percpu_counter_destroy(&br->br_count); | |
4743 | +} | |
4744 | + | |
1facf9fc | 4745 | +static inline int au_br_rdonly(struct au_branch *br) |
4746 | +{ | |
8b6a4947 | 4747 | + return (sb_rdonly(au_br_sb(br)) |
1facf9fc | 4748 | + || !au_br_writable(br->br_perm)) |
4749 | + ? -EROFS : 0; | |
4750 | +} | |
4751 | + | |
4a4d8108 | 4752 | +static inline int au_br_hnotifyable(int brperm __maybe_unused) |
1facf9fc | 4753 | +{ |
4a4d8108 | 4754 | +#ifdef CONFIG_AUFS_HNOTIFY |
1e00d052 | 4755 | + return !(brperm & AuBrPerm_RR); |
1facf9fc | 4756 | +#else |
4757 | + return 0; | |
4758 | +#endif | |
4759 | +} | |
4760 | + | |
b912730e AM |
4761 | +static inline int au_br_test_oflag(int oflag, struct au_branch *br) |
4762 | +{ | |
4763 | + int err, exec_flag; | |
4764 | + | |
4765 | + err = 0; | |
4766 | + exec_flag = oflag & __FMODE_EXEC; | |
79b8bda9 | 4767 | + if (unlikely(exec_flag && path_noexec(&br->br_path))) |
b912730e AM |
4768 | + err = -EACCES; |
4769 | + | |
4770 | + return err; | |
4771 | +} | |
4772 | + | |
062440b3 AM |
4773 | +static inline void au_xino_get(struct au_branch *br) |
4774 | +{ | |
4775 | + struct au_xino *xi; | |
4776 | + | |
4777 | + xi = br->br_xino; | |
4778 | + if (xi) | |
4779 | + kref_get(&xi->xi_kref); | |
4780 | +} | |
4781 | + | |
4782 | +static inline int au_xino_count(struct au_branch *br) | |
4783 | +{ | |
4784 | + int v; | |
4785 | + struct au_xino *xi; | |
4786 | + | |
4787 | + v = 0; | |
4788 | + xi = br->br_xino; | |
4789 | + if (xi) | |
4790 | + v = kref_read(&xi->xi_kref); | |
4791 | + | |
4792 | + return v; | |
4793 | +} | |
4794 | + | |
4795 | +static inline struct file *au_xino_file(struct au_branch *br) | |
4796 | +{ | |
4797 | + struct au_xino *xi; | |
4798 | + | |
4799 | + xi = br->br_xino; | |
4800 | + return xi ? xi->xi_file : NULL; | |
4801 | +} | |
4802 | + | |
1facf9fc | 4803 | +/* ---------------------------------------------------------------------- */ |
4804 | + | |
4805 | +/* branch.c */ | |
4806 | +struct au_sbinfo; | |
4807 | +void au_br_free(struct au_sbinfo *sinfo); | |
4808 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id); | |
4809 | +struct au_opt_add; | |
4810 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount); | |
4811 | +struct au_opt_del; | |
4812 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount); | |
027c5e7a AM |
4813 | +long au_ibusy_ioctl(struct file *file, unsigned long arg); |
4814 | +#ifdef CONFIG_COMPAT | |
4815 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg); | |
4816 | +#endif | |
1facf9fc | 4817 | +struct au_opt_mod; |
4818 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 4819 | + int *do_refresh); |
076b876e AM |
4820 | +struct aufs_stfs; |
4821 | +int au_br_stfs(struct au_branch *br, struct aufs_stfs *stfs); | |
1facf9fc | 4822 | + |
4823 | +/* xino.c */ | |
4824 | +static const loff_t au_loff_max = LLONG_MAX; | |
4825 | + | |
062440b3 AM |
4826 | +struct file *au_xino_create(struct super_block *sb, char *fpath, int silent); |
4827 | +struct file *au_xino_create2(struct super_block *sb, struct path *base, | |
4828 | + struct file *copy_src); | |
4829 | + | |
4830 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4831 | + ino_t *ino); | |
4832 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4833 | + ino_t ino); | |
5527c038 | 4834 | +ssize_t xino_fread(vfs_readf_t func, struct file *file, void *buf, size_t size, |
1facf9fc | 4835 | + loff_t *pos); |
5527c038 JR |
4836 | +ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, |
4837 | + size_t size, loff_t *pos); | |
062440b3 AM |
4838 | + |
4839 | +int au_xib_trunc(struct super_block *sb); | |
1facf9fc | 4840 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex); |
4841 | + | |
062440b3 AM |
4842 | +struct au_xino *au_xino_alloc(void); |
4843 | +int au_xino_put(struct au_branch *br); | |
4844 | +void au_xino_file_set(struct au_branch *br, struct file *file); | |
4845 | + | |
1facf9fc | 4846 | +struct au_opt_xino; |
1facf9fc | 4847 | +void au_xino_clr(struct super_block *sb); |
062440b3 | 4848 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount); |
1facf9fc | 4849 | +struct file *au_xino_def(struct super_block *sb); |
062440b3 AM |
4850 | +int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t hino, |
4851 | + struct path *base); | |
4852 | + | |
4853 | +ino_t au_xino_new_ino(struct super_block *sb); | |
4854 | +void au_xino_delete_inode(struct inode *inode, const int unlinked); | |
1facf9fc | 4855 | + |
521ced18 JR |
4856 | +void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, |
4857 | + ino_t h_ino, int idx); | |
4858 | +int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
4859 | + int *idx); | |
4860 | + | |
062440b3 AM |
4861 | +int au_xino_path(struct seq_file *seq, struct file *file); |
4862 | + | |
1facf9fc | 4863 | +/* ---------------------------------------------------------------------- */ |
4864 | + | |
4865 | +/* Superblock to branch */ | |
4866 | +static inline | |
4867 | +aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex) | |
4868 | +{ | |
4869 | + return au_sbr(sb, bindex)->br_id; | |
4870 | +} | |
4871 | + | |
4872 | +static inline | |
4873 | +struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex) | |
4874 | +{ | |
86dc4139 | 4875 | + return au_br_mnt(au_sbr(sb, bindex)); |
1facf9fc | 4876 | +} |
4877 | + | |
4878 | +static inline | |
4879 | +struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex) | |
4880 | +{ | |
86dc4139 | 4881 | + return au_br_sb(au_sbr(sb, bindex)); |
1facf9fc | 4882 | +} |
4883 | + | |
5afbbe0d AM |
4884 | +static inline void au_sbr_get(struct super_block *sb, aufs_bindex_t bindex) |
4885 | +{ | |
4886 | + au_br_get(au_sbr(sb, bindex)); | |
4887 | +} | |
4888 | + | |
1facf9fc | 4889 | +static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex) |
4890 | +{ | |
5afbbe0d | 4891 | + au_br_put(au_sbr(sb, bindex)); |
1facf9fc | 4892 | +} |
4893 | + | |
4894 | +static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex) | |
4895 | +{ | |
4896 | + return au_sbr(sb, bindex)->br_perm; | |
4897 | +} | |
4898 | + | |
4899 | +static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex) | |
4900 | +{ | |
4901 | + return au_br_whable(au_sbr_perm(sb, bindex)); | |
4902 | +} | |
4903 | + | |
4904 | +/* ---------------------------------------------------------------------- */ | |
4905 | + | |
8b6a4947 AM |
4906 | +#define wbr_wh_read_lock(wbr) au_rw_read_lock(&(wbr)->wbr_wh_rwsem) |
4907 | +#define wbr_wh_write_lock(wbr) au_rw_write_lock(&(wbr)->wbr_wh_rwsem) | |
4908 | +#define wbr_wh_read_trylock(wbr) au_rw_read_trylock(&(wbr)->wbr_wh_rwsem) | |
4909 | +#define wbr_wh_write_trylock(wbr) au_rw_write_trylock(&(wbr)->wbr_wh_rwsem) | |
1facf9fc | 4910 | +/* |
8b6a4947 AM |
4911 | +#define wbr_wh_read_trylock_nested(wbr) \ |
4912 | + au_rw_read_trylock_nested(&(wbr)->wbr_wh_rwsem) | |
4913 | +#define wbr_wh_write_trylock_nested(wbr) \ | |
4914 | + au_rw_write_trylock_nested(&(wbr)->wbr_wh_rwsem) | |
4915 | +*/ | |
1facf9fc | 4916 | + |
8b6a4947 AM |
4917 | +#define wbr_wh_read_unlock(wbr) au_rw_read_unlock(&(wbr)->wbr_wh_rwsem) |
4918 | +#define wbr_wh_write_unlock(wbr) au_rw_write_unlock(&(wbr)->wbr_wh_rwsem) | |
4919 | +#define wbr_wh_downgrade_lock(wbr) au_rw_dgrade_lock(&(wbr)->wbr_wh_rwsem) | |
4920 | + | |
4921 | +#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&(wbr)->wbr_wh_rwsem) | |
4922 | +#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&(wbr)->wbr_wh_rwsem) | |
4923 | +#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&(wbr)->wbr_wh_rwsem) | |
dece6358 | 4924 | + |
076b876e AM |
4925 | +/* ---------------------------------------------------------------------- */ |
4926 | + | |
4927 | +#ifdef CONFIG_AUFS_FHSM | |
4928 | +static inline void au_br_fhsm_init(struct au_br_fhsm *brfhsm) | |
4929 | +{ | |
4930 | + mutex_init(&brfhsm->bf_lock); | |
4931 | + brfhsm->bf_jiffy = 0; | |
4932 | + brfhsm->bf_readable = 0; | |
4933 | +} | |
4934 | + | |
4935 | +static inline void au_br_fhsm_fin(struct au_br_fhsm *brfhsm) | |
4936 | +{ | |
4937 | + mutex_destroy(&brfhsm->bf_lock); | |
4938 | +} | |
4939 | +#else | |
4940 | +AuStubVoid(au_br_fhsm_init, struct au_br_fhsm *brfhsm) | |
4941 | +AuStubVoid(au_br_fhsm_fin, struct au_br_fhsm *brfhsm) | |
4942 | +#endif | |
4943 | + | |
1facf9fc | 4944 | +#endif /* __KERNEL__ */ |
4945 | +#endif /* __AUFS_BRANCH_H__ */ | |
7f207e10 AM |
4946 | diff -urN /usr/share/empty/fs/aufs/conf.mk linux/fs/aufs/conf.mk |
4947 | --- /usr/share/empty/fs/aufs/conf.mk 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 4948 | +++ linux/fs/aufs/conf.mk 2018-06-04 09:08:09.181412645 +0200 |
2121bcd9 AM |
4949 | @@ -0,0 +1,40 @@ |
4950 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
4951 | + |
4952 | +AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS} | |
4953 | + | |
4954 | +define AuConf | |
4955 | +ifdef ${1} | |
4956 | +AuConfStr += ${1}=${${1}} | |
4957 | +endif | |
4958 | +endef | |
4959 | + | |
b752ccd1 | 4960 | +AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \ |
e49829fe | 4961 | + SBILIST \ |
7f207e10 | 4962 | + HNOTIFY HFSNOTIFY \ |
4a4d8108 | 4963 | + EXPORT INO_T_64 \ |
c1595e42 | 4964 | + XATTR \ |
076b876e | 4965 | + FHSM \ |
4a4d8108 | 4966 | + RDU \ |
8b6a4947 | 4967 | + DIRREN \ |
4a4d8108 AM |
4968 | + SHWH \ |
4969 | + BR_RAMFS \ | |
4970 | + BR_FUSE POLL \ | |
4971 | + BR_HFSPLUS \ | |
4972 | + BDEV_LOOP \ | |
b752ccd1 AM |
4973 | + DEBUG MAGIC_SYSRQ |
4974 | +$(foreach i, ${AuConfAll}, \ | |
4a4d8108 AM |
4975 | + $(eval $(call AuConf,CONFIG_AUFS_${i}))) |
4976 | + | |
4977 | +AuConfName = ${obj}/conf.str | |
4978 | +${AuConfName}.tmp: FORCE | |
4979 | + @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@ | |
4980 | +${AuConfName}: ${AuConfName}.tmp | |
4981 | + @diff -q $< $@ > /dev/null 2>&1 || { \ | |
4982 | + echo ' GEN ' $@; \ | |
4983 | + cp -p $< $@; \ | |
4984 | + } | |
4985 | +FORCE: | |
4986 | +clean-files += ${AuConfName} ${AuConfName}.tmp | |
4987 | +${obj}/sysfs.o: ${AuConfName} | |
b752ccd1 AM |
4988 | + |
4989 | +-include ${srctree}/${src}/conf_priv.mk | |
7f207e10 AM |
4990 | diff -urN /usr/share/empty/fs/aufs/cpup.c linux/fs/aufs/cpup.c |
4991 | --- /usr/share/empty/fs/aufs/cpup.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 AM |
4992 | +++ linux/fs/aufs/cpup.c 2018-08-12 23:43:05.453457863 +0200 |
4993 | @@ -0,0 +1,1441 @@ | |
4994 | +// SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 4995 | +/* |
b00004a5 | 4996 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 4997 | + * |
4998 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4999 | + * it under the terms of the GNU General Public License as published by | |
5000 | + * the Free Software Foundation; either version 2 of the License, or | |
5001 | + * (at your option) any later version. | |
dece6358 AM |
5002 | + * |
5003 | + * This program is distributed in the hope that it will be useful, | |
5004 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5005 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5006 | + * GNU General Public License for more details. | |
5007 | + * | |
5008 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 5009 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 5010 | + */ |
5011 | + | |
5012 | +/* | |
5013 | + * copy-up functions, see wbr_policy.c for copy-down | |
5014 | + */ | |
5015 | + | |
5016 | +#include <linux/fs_stack.h> | |
dece6358 | 5017 | +#include <linux/mm.h> |
8cdd5066 | 5018 | +#include <linux/task_work.h> |
1facf9fc | 5019 | +#include "aufs.h" |
5020 | + | |
86dc4139 | 5021 | +void au_cpup_attr_flags(struct inode *dst, unsigned int iflags) |
1facf9fc | 5022 | +{ |
5023 | + const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE | |
367653fa | 5024 | + | S_NOATIME | S_NOCMTIME | S_AUTOMOUNT; |
1facf9fc | 5025 | + |
86dc4139 AM |
5026 | + BUILD_BUG_ON(sizeof(iflags) != sizeof(dst->i_flags)); |
5027 | + | |
5028 | + dst->i_flags |= iflags & ~mask; | |
1facf9fc | 5029 | + if (au_test_fs_notime(dst->i_sb)) |
5030 | + dst->i_flags |= S_NOATIME | S_NOCMTIME; | |
5031 | +} | |
5032 | + | |
5033 | +void au_cpup_attr_timesizes(struct inode *inode) | |
5034 | +{ | |
5035 | + struct inode *h_inode; | |
5036 | + | |
5afbbe0d | 5037 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 5038 | + fsstack_copy_attr_times(inode, h_inode); |
4a4d8108 | 5039 | + fsstack_copy_inode_size(inode, h_inode); |
1facf9fc | 5040 | +} |
5041 | + | |
5042 | +void au_cpup_attr_nlink(struct inode *inode, int force) | |
5043 | +{ | |
5044 | + struct inode *h_inode; | |
5045 | + struct super_block *sb; | |
5afbbe0d | 5046 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 5047 | + |
5048 | + sb = inode->i_sb; | |
5afbbe0d | 5049 | + bindex = au_ibtop(inode); |
1facf9fc | 5050 | + h_inode = au_h_iptr(inode, bindex); |
5051 | + if (!force | |
5052 | + && !S_ISDIR(h_inode->i_mode) | |
5053 | + && au_opt_test(au_mntflags(sb), PLINK) | |
5054 | + && au_plink_test(inode)) | |
5055 | + return; | |
5056 | + | |
7eafdf33 AM |
5057 | + /* |
5058 | + * 0 can happen in revalidating. | |
38d290e6 JR |
5059 | + * h_inode->i_mutex may not be held here, but it is harmless since once |
5060 | + * i_nlink reaches 0, it will never become positive except O_TMPFILE | |
5061 | + * case. | |
5062 | + * todo: O_TMPFILE+linkat(AT_SYMLINK_FOLLOW) bypassing aufs may cause | |
5063 | + * the incorrect link count. | |
7eafdf33 | 5064 | + */ |
92d182d2 | 5065 | + set_nlink(inode, h_inode->i_nlink); |
1facf9fc | 5066 | + |
5067 | + /* | |
5068 | + * fewer nlink makes find(1) noisy, but larger nlink doesn't. | |
5069 | + * it may includes whplink directory. | |
5070 | + */ | |
5071 | + if (S_ISDIR(h_inode->i_mode)) { | |
5afbbe0d AM |
5072 | + bbot = au_ibbot(inode); |
5073 | + for (bindex++; bindex <= bbot; bindex++) { | |
1facf9fc | 5074 | + h_inode = au_h_iptr(inode, bindex); |
5075 | + if (h_inode) | |
5076 | + au_add_nlink(inode, h_inode); | |
5077 | + } | |
5078 | + } | |
5079 | +} | |
5080 | + | |
5081 | +void au_cpup_attr_changeable(struct inode *inode) | |
5082 | +{ | |
5083 | + struct inode *h_inode; | |
5084 | + | |
5afbbe0d | 5085 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 5086 | + inode->i_mode = h_inode->i_mode; |
5087 | + inode->i_uid = h_inode->i_uid; | |
5088 | + inode->i_gid = h_inode->i_gid; | |
5089 | + au_cpup_attr_timesizes(inode); | |
86dc4139 | 5090 | + au_cpup_attr_flags(inode, h_inode->i_flags); |
1facf9fc | 5091 | +} |
5092 | + | |
5093 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode) | |
5094 | +{ | |
5095 | + struct au_iinfo *iinfo = au_ii(inode); | |
5096 | + | |
1308ab2a | 5097 | + IiMustWriteLock(inode); |
5098 | + | |
1facf9fc | 5099 | + iinfo->ii_higen = h_inode->i_generation; |
5100 | + iinfo->ii_hsb1 = h_inode->i_sb; | |
5101 | +} | |
5102 | + | |
5103 | +void au_cpup_attr_all(struct inode *inode, int force) | |
5104 | +{ | |
5105 | + struct inode *h_inode; | |
5106 | + | |
5afbbe0d | 5107 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
1facf9fc | 5108 | + au_cpup_attr_changeable(inode); |
5109 | + if (inode->i_nlink > 0) | |
5110 | + au_cpup_attr_nlink(inode, force); | |
5111 | + inode->i_rdev = h_inode->i_rdev; | |
5112 | + inode->i_blkbits = h_inode->i_blkbits; | |
5113 | + au_cpup_igen(inode, h_inode); | |
5114 | +} | |
5115 | + | |
5116 | +/* ---------------------------------------------------------------------- */ | |
5117 | + | |
5118 | +/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ | |
5119 | + | |
5120 | +/* keep the timestamps of the parent dir when cpup */ | |
5121 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
5122 | + struct path *h_path) | |
5123 | +{ | |
5124 | + struct inode *h_inode; | |
5125 | + | |
5126 | + dt->dt_dentry = dentry; | |
5127 | + dt->dt_h_path = *h_path; | |
5527c038 | 5128 | + h_inode = d_inode(h_path->dentry); |
1facf9fc | 5129 | + dt->dt_atime = h_inode->i_atime; |
5130 | + dt->dt_mtime = h_inode->i_mtime; | |
5131 | + /* smp_mb(); */ | |
5132 | +} | |
5133 | + | |
5134 | +void au_dtime_revert(struct au_dtime *dt) | |
5135 | +{ | |
5136 | + struct iattr attr; | |
5137 | + int err; | |
5138 | + | |
5139 | + attr.ia_atime = dt->dt_atime; | |
5140 | + attr.ia_mtime = dt->dt_mtime; | |
5141 | + attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET | |
5142 | + | ATTR_ATIME | ATTR_ATIME_SET; | |
5143 | + | |
523b37e3 AM |
5144 | + /* no delegation since this is a directory */ |
5145 | + err = vfsub_notify_change(&dt->dt_h_path, &attr, /*delegated*/NULL); | |
1facf9fc | 5146 | + if (unlikely(err)) |
0c3ec466 | 5147 | + pr_warn("restoring timestamps failed(%d). ignored\n", err); |
1facf9fc | 5148 | +} |
5149 | + | |
5150 | +/* ---------------------------------------------------------------------- */ | |
5151 | + | |
86dc4139 AM |
5152 | +/* internal use only */ |
5153 | +struct au_cpup_reg_attr { | |
5154 | + int valid; | |
5155 | + struct kstat st; | |
5156 | + unsigned int iflags; /* inode->i_flags */ | |
5157 | +}; | |
5158 | + | |
1facf9fc | 5159 | +static noinline_for_stack |
86dc4139 AM |
5160 | +int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src, |
5161 | + struct au_cpup_reg_attr *h_src_attr) | |
1facf9fc | 5162 | +{ |
c1595e42 | 5163 | + int err, sbits, icex; |
7e9cd9fe AM |
5164 | + unsigned int mnt_flags; |
5165 | + unsigned char verbose; | |
1facf9fc | 5166 | + struct iattr ia; |
5167 | + struct path h_path; | |
1308ab2a | 5168 | + struct inode *h_isrc, *h_idst; |
86dc4139 | 5169 | + struct kstat *h_st; |
c1595e42 | 5170 | + struct au_branch *br; |
1facf9fc | 5171 | + |
5172 | + h_path.dentry = au_h_dptr(dst, bindex); | |
5527c038 | 5173 | + h_idst = d_inode(h_path.dentry); |
c1595e42 JR |
5174 | + br = au_sbr(dst->d_sb, bindex); |
5175 | + h_path.mnt = au_br_mnt(br); | |
5527c038 | 5176 | + h_isrc = d_inode(h_src); |
1308ab2a | 5177 | + ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID |
1facf9fc | 5178 | + | ATTR_ATIME | ATTR_MTIME |
5179 | + | ATTR_ATIME_SET | ATTR_MTIME_SET; | |
86dc4139 AM |
5180 | + if (h_src_attr && h_src_attr->valid) { |
5181 | + h_st = &h_src_attr->st; | |
5182 | + ia.ia_uid = h_st->uid; | |
5183 | + ia.ia_gid = h_st->gid; | |
5184 | + ia.ia_atime = h_st->atime; | |
5185 | + ia.ia_mtime = h_st->mtime; | |
5186 | + if (h_idst->i_mode != h_st->mode | |
5187 | + && !S_ISLNK(h_idst->i_mode)) { | |
5188 | + ia.ia_valid |= ATTR_MODE; | |
5189 | + ia.ia_mode = h_st->mode; | |
5190 | + } | |
5191 | + sbits = !!(h_st->mode & (S_ISUID | S_ISGID)); | |
5192 | + au_cpup_attr_flags(h_idst, h_src_attr->iflags); | |
5193 | + } else { | |
5194 | + ia.ia_uid = h_isrc->i_uid; | |
5195 | + ia.ia_gid = h_isrc->i_gid; | |
5196 | + ia.ia_atime = h_isrc->i_atime; | |
5197 | + ia.ia_mtime = h_isrc->i_mtime; | |
5198 | + if (h_idst->i_mode != h_isrc->i_mode | |
5199 | + && !S_ISLNK(h_idst->i_mode)) { | |
5200 | + ia.ia_valid |= ATTR_MODE; | |
5201 | + ia.ia_mode = h_isrc->i_mode; | |
5202 | + } | |
5203 | + sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); | |
5204 | + au_cpup_attr_flags(h_idst, h_isrc->i_flags); | |
1308ab2a | 5205 | + } |
523b37e3 AM |
5206 | + /* no delegation since it is just created */ |
5207 | + err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); | |
1facf9fc | 5208 | + |
5209 | + /* is this nfs only? */ | |
5210 | + if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { | |
5211 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
5212 | + ia.ia_mode = h_isrc->i_mode; | |
523b37e3 | 5213 | + err = vfsub_notify_change(&h_path, &ia, /*delegated*/NULL); |
1facf9fc | 5214 | + } |
5215 | + | |
c1595e42 | 5216 | + icex = br->br_perm & AuBrAttr_ICEX; |
7e9cd9fe AM |
5217 | + if (!err) { |
5218 | + mnt_flags = au_mntflags(dst->d_sb); | |
5219 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
5220 | + err = au_cpup_xattr(h_path.dentry, h_src, icex, verbose); | |
5221 | + } | |
c1595e42 | 5222 | + |
1facf9fc | 5223 | + return err; |
5224 | +} | |
5225 | + | |
5226 | +/* ---------------------------------------------------------------------- */ | |
5227 | + | |
5228 | +static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, | |
5229 | + char *buf, unsigned long blksize) | |
5230 | +{ | |
5231 | + int err; | |
5232 | + size_t sz, rbytes, wbytes; | |
5233 | + unsigned char all_zero; | |
5234 | + char *p, *zp; | |
febd17d6 | 5235 | + struct inode *h_inode; |
1facf9fc | 5236 | + /* reduce stack usage */ |
5237 | + struct iattr *ia; | |
5238 | + | |
5239 | + zp = page_address(ZERO_PAGE(0)); | |
5240 | + if (unlikely(!zp)) | |
5241 | + return -ENOMEM; /* possible? */ | |
5242 | + | |
5243 | + err = 0; | |
5244 | + all_zero = 0; | |
5245 | + while (len) { | |
5246 | + AuDbg("len %lld\n", len); | |
5247 | + sz = blksize; | |
5248 | + if (len < blksize) | |
5249 | + sz = len; | |
5250 | + | |
5251 | + rbytes = 0; | |
5252 | + /* todo: signal_pending? */ | |
5253 | + while (!rbytes || err == -EAGAIN || err == -EINTR) { | |
5254 | + rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); | |
5255 | + err = rbytes; | |
5256 | + } | |
5257 | + if (unlikely(err < 0)) | |
5258 | + break; | |
5259 | + | |
5260 | + all_zero = 0; | |
5261 | + if (len >= rbytes && rbytes == blksize) | |
5262 | + all_zero = !memcmp(buf, zp, rbytes); | |
5263 | + if (!all_zero) { | |
5264 | + wbytes = rbytes; | |
5265 | + p = buf; | |
5266 | + while (wbytes) { | |
5267 | + size_t b; | |
5268 | + | |
5269 | + b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); | |
5270 | + err = b; | |
5271 | + /* todo: signal_pending? */ | |
5272 | + if (unlikely(err == -EAGAIN || err == -EINTR)) | |
5273 | + continue; | |
5274 | + if (unlikely(err < 0)) | |
5275 | + break; | |
5276 | + wbytes -= b; | |
5277 | + p += b; | |
5278 | + } | |
392086de AM |
5279 | + if (unlikely(err < 0)) |
5280 | + break; | |
1facf9fc | 5281 | + } else { |
5282 | + loff_t res; | |
5283 | + | |
5284 | + AuLabel(hole); | |
5285 | + res = vfsub_llseek(dst, rbytes, SEEK_CUR); | |
5286 | + err = res; | |
5287 | + if (unlikely(res < 0)) | |
5288 | + break; | |
5289 | + } | |
5290 | + len -= rbytes; | |
5291 | + err = 0; | |
5292 | + } | |
5293 | + | |
5294 | + /* the last block may be a hole */ | |
5295 | + if (!err && all_zero) { | |
5296 | + AuLabel(last hole); | |
5297 | + | |
5298 | + err = 1; | |
2000de60 | 5299 | + if (au_test_nfs(dst->f_path.dentry->d_sb)) { |
1facf9fc | 5300 | + /* nfs requires this step to make last hole */ |
5301 | + /* is this only nfs? */ | |
5302 | + do { | |
5303 | + /* todo: signal_pending? */ | |
5304 | + err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); | |
5305 | + } while (err == -EAGAIN || err == -EINTR); | |
5306 | + if (err == 1) | |
5307 | + dst->f_pos--; | |
5308 | + } | |
5309 | + | |
5310 | + if (err == 1) { | |
5311 | + ia = (void *)buf; | |
5312 | + ia->ia_size = dst->f_pos; | |
5313 | + ia->ia_valid = ATTR_SIZE | ATTR_FILE; | |
5314 | + ia->ia_file = dst; | |
febd17d6 JR |
5315 | + h_inode = file_inode(dst); |
5316 | + inode_lock_nested(h_inode, AuLsc_I_CHILD2); | |
523b37e3 AM |
5317 | + /* no delegation since it is just created */ |
5318 | + err = vfsub_notify_change(&dst->f_path, ia, | |
5319 | + /*delegated*/NULL); | |
febd17d6 | 5320 | + inode_unlock(h_inode); |
1facf9fc | 5321 | + } |
5322 | + } | |
5323 | + | |
5324 | + return err; | |
5325 | +} | |
5326 | + | |
5327 | +int au_copy_file(struct file *dst, struct file *src, loff_t len) | |
5328 | +{ | |
5329 | + int err; | |
5330 | + unsigned long blksize; | |
5331 | + unsigned char do_kfree; | |
5332 | + char *buf; | |
5333 | + | |
5334 | + err = -ENOMEM; | |
2000de60 | 5335 | + blksize = dst->f_path.dentry->d_sb->s_blocksize; |
1facf9fc | 5336 | + if (!blksize || PAGE_SIZE < blksize) |
5337 | + blksize = PAGE_SIZE; | |
5338 | + AuDbg("blksize %lu\n", blksize); | |
5339 | + do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); | |
5340 | + if (do_kfree) | |
5341 | + buf = kmalloc(blksize, GFP_NOFS); | |
5342 | + else | |
5343 | + buf = (void *)__get_free_page(GFP_NOFS); | |
5344 | + if (unlikely(!buf)) | |
5345 | + goto out; | |
5346 | + | |
5347 | + if (len > (1 << 22)) | |
5348 | + AuDbg("copying a large file %lld\n", (long long)len); | |
5349 | + | |
5350 | + src->f_pos = 0; | |
5351 | + dst->f_pos = 0; | |
5352 | + err = au_do_copy_file(dst, src, len, buf, blksize); | |
5353 | + if (do_kfree) | |
1c60b727 | 5354 | + kfree(buf); |
1facf9fc | 5355 | + else |
1c60b727 | 5356 | + free_page((unsigned long)buf); |
1facf9fc | 5357 | + |
4f0767ce | 5358 | +out: |
1facf9fc | 5359 | + return err; |
5360 | +} | |
5361 | + | |
1c60b727 AM |
5362 | +static int au_do_copy(struct file *dst, struct file *src, loff_t len) |
5363 | +{ | |
5364 | + int err; | |
5365 | + struct super_block *h_src_sb; | |
5366 | + struct inode *h_src_inode; | |
5367 | + | |
5368 | + h_src_inode = file_inode(src); | |
5369 | + h_src_sb = h_src_inode->i_sb; | |
5370 | + | |
5371 | + /* XFS acquires inode_lock */ | |
5372 | + if (!au_test_xfs(h_src_sb)) | |
5373 | + err = au_copy_file(dst, src, len); | |
5374 | + else { | |
3c1bdaff | 5375 | + inode_unlock_shared(h_src_inode); |
1c60b727 | 5376 | + err = au_copy_file(dst, src, len); |
be118d29 | 5377 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
1c60b727 AM |
5378 | + } |
5379 | + | |
5380 | + return err; | |
5381 | +} | |
5382 | + | |
5383 | +static int au_clone_or_copy(struct file *dst, struct file *src, loff_t len) | |
5384 | +{ | |
5385 | + int err; | |
5386 | + struct super_block *h_src_sb; | |
5387 | + struct inode *h_src_inode; | |
5388 | + | |
5389 | + h_src_inode = file_inode(src); | |
5390 | + h_src_sb = h_src_inode->i_sb; | |
5391 | + if (h_src_sb != file_inode(dst)->i_sb | |
5392 | + || !dst->f_op->clone_file_range) { | |
5393 | + err = au_do_copy(dst, src, len); | |
5394 | + goto out; | |
5395 | + } | |
5396 | + | |
5397 | + if (!au_test_nfs(h_src_sb)) { | |
3c1bdaff | 5398 | + inode_unlock_shared(h_src_inode); |
1c60b727 | 5399 | + err = vfsub_clone_file_range(src, dst, len); |
be118d29 | 5400 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
1c60b727 AM |
5401 | + } else |
5402 | + err = vfsub_clone_file_range(src, dst, len); | |
5403 | + /* older XFS has a condition in cloning */ | |
5404 | + if (unlikely(err != -EOPNOTSUPP)) | |
5405 | + goto out; | |
5406 | + | |
5407 | + /* the backend fs on NFS may not support cloning */ | |
5408 | + err = au_do_copy(dst, src, len); | |
5409 | + | |
5410 | +out: | |
5411 | + AuTraceErr(err); | |
5412 | + return err; | |
5413 | +} | |
5414 | + | |
1facf9fc | 5415 | +/* |
5416 | + * to support a sparse file which is opened with O_APPEND, | |
5417 | + * we need to close the file. | |
5418 | + */ | |
c2b27bf2 | 5419 | +static int au_cp_regular(struct au_cp_generic *cpg) |
1facf9fc | 5420 | +{ |
5421 | + int err, i; | |
5422 | + enum { SRC, DST }; | |
5423 | + struct { | |
5424 | + aufs_bindex_t bindex; | |
5425 | + unsigned int flags; | |
5426 | + struct dentry *dentry; | |
392086de | 5427 | + int force_wr; |
1facf9fc | 5428 | + struct file *file; |
523b37e3 | 5429 | + void *label; |
1facf9fc | 5430 | + } *f, file[] = { |
5431 | + { | |
c2b27bf2 | 5432 | + .bindex = cpg->bsrc, |
1facf9fc | 5433 | + .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, |
523b37e3 | 5434 | + .label = &&out |
1facf9fc | 5435 | + }, |
5436 | + { | |
c2b27bf2 | 5437 | + .bindex = cpg->bdst, |
1facf9fc | 5438 | + .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, |
392086de | 5439 | + .force_wr = !!au_ftest_cpup(cpg->flags, RWDST), |
523b37e3 | 5440 | + .label = &&out_src |
1facf9fc | 5441 | + } |
5442 | + }; | |
521ced18 | 5443 | + struct super_block *sb, *h_src_sb; |
e2f27e51 | 5444 | + struct inode *h_src_inode; |
8cdd5066 | 5445 | + struct task_struct *tsk = current; |
1facf9fc | 5446 | + |
5447 | + /* bsrc branch can be ro/rw. */ | |
c2b27bf2 | 5448 | + sb = cpg->dentry->d_sb; |
1facf9fc | 5449 | + f = file; |
5450 | + for (i = 0; i < 2; i++, f++) { | |
c2b27bf2 AM |
5451 | + f->dentry = au_h_dptr(cpg->dentry, f->bindex); |
5452 | + f->file = au_h_open(cpg->dentry, f->bindex, f->flags, | |
392086de | 5453 | + /*file*/NULL, f->force_wr); |
1facf9fc | 5454 | + err = PTR_ERR(f->file); |
5455 | + if (IS_ERR(f->file)) | |
5456 | + goto *f->label; | |
1facf9fc | 5457 | + } |
5458 | + | |
5459 | + /* try stopping to update while we copyup */ | |
e2f27e51 | 5460 | + h_src_inode = d_inode(file[SRC].dentry); |
521ced18 JR |
5461 | + h_src_sb = h_src_inode->i_sb; |
5462 | + if (!au_test_nfs(h_src_sb)) | |
e2f27e51 | 5463 | + IMustLock(h_src_inode); |
1c60b727 | 5464 | + err = au_clone_or_copy(file[DST].file, file[SRC].file, cpg->len); |
1facf9fc | 5465 | + |
8cdd5066 JR |
5466 | + /* i wonder if we had O_NO_DELAY_FPUT flag */ |
5467 | + if (tsk->flags & PF_KTHREAD) | |
5468 | + __fput_sync(file[DST].file); | |
5469 | + else { | |
062440b3 | 5470 | + /* it happened actually */ |
8cdd5066 JR |
5471 | + fput(file[DST].file); |
5472 | + /* | |
5473 | + * too bad. | |
5474 | + * we have to call both since we don't know which place the file | |
5475 | + * was added to. | |
5476 | + */ | |
5477 | + task_work_run(); | |
5478 | + flush_delayed_fput(); | |
5479 | + } | |
1facf9fc | 5480 | + au_sbr_put(sb, file[DST].bindex); |
523b37e3 | 5481 | + |
4f0767ce | 5482 | +out_src: |
1facf9fc | 5483 | + fput(file[SRC].file); |
5484 | + au_sbr_put(sb, file[SRC].bindex); | |
4f0767ce | 5485 | +out: |
1facf9fc | 5486 | + return err; |
5487 | +} | |
5488 | + | |
c2b27bf2 | 5489 | +static int au_do_cpup_regular(struct au_cp_generic *cpg, |
86dc4139 | 5490 | + struct au_cpup_reg_attr *h_src_attr) |
1facf9fc | 5491 | +{ |
5492 | + int err, rerr; | |
5493 | + loff_t l; | |
86dc4139 | 5494 | + struct path h_path; |
38d290e6 | 5495 | + struct inode *h_src_inode, *h_dst_inode; |
1facf9fc | 5496 | + |
5497 | + err = 0; | |
5527c038 | 5498 | + h_src_inode = au_h_iptr(d_inode(cpg->dentry), cpg->bsrc); |
86dc4139 | 5499 | + l = i_size_read(h_src_inode); |
c2b27bf2 AM |
5500 | + if (cpg->len == -1 || l < cpg->len) |
5501 | + cpg->len = l; | |
5502 | + if (cpg->len) { | |
86dc4139 | 5503 | + /* try stopping to update while we are referencing */ |
be118d29 | 5504 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
c2b27bf2 | 5505 | + au_pin_hdir_unlock(cpg->pin); |
1facf9fc | 5506 | + |
c2b27bf2 AM |
5507 | + h_path.dentry = au_h_dptr(cpg->dentry, cpg->bsrc); |
5508 | + h_path.mnt = au_sbr_mnt(cpg->dentry->d_sb, cpg->bsrc); | |
86dc4139 | 5509 | + h_src_attr->iflags = h_src_inode->i_flags; |
5527c038 | 5510 | + if (!au_test_nfs(h_src_inode->i_sb)) |
521ced18 | 5511 | + err = vfsub_getattr(&h_path, &h_src_attr->st); |
5527c038 | 5512 | + else { |
3c1bdaff | 5513 | + inode_unlock_shared(h_src_inode); |
521ced18 | 5514 | + err = vfsub_getattr(&h_path, &h_src_attr->st); |
be118d29 | 5515 | + inode_lock_shared_nested(h_src_inode, AuLsc_I_CHILD); |
5527c038 | 5516 | + } |
86dc4139 | 5517 | + if (unlikely(err)) { |
3c1bdaff | 5518 | + inode_unlock_shared(h_src_inode); |
86dc4139 AM |
5519 | + goto out; |
5520 | + } | |
5521 | + h_src_attr->valid = 1; | |
e2f27e51 AM |
5522 | + if (!au_test_nfs(h_src_inode->i_sb)) { |
5523 | + err = au_cp_regular(cpg); | |
3c1bdaff | 5524 | + inode_unlock_shared(h_src_inode); |
e2f27e51 | 5525 | + } else { |
3c1bdaff | 5526 | + inode_unlock_shared(h_src_inode); |
e2f27e51 AM |
5527 | + err = au_cp_regular(cpg); |
5528 | + } | |
c2b27bf2 | 5529 | + rerr = au_pin_hdir_relock(cpg->pin); |
86dc4139 AM |
5530 | + if (!err && rerr) |
5531 | + err = rerr; | |
1facf9fc | 5532 | + } |
38d290e6 JR |
5533 | + if (!err && (h_src_inode->i_state & I_LINKABLE)) { |
5534 | + h_path.dentry = au_h_dptr(cpg->dentry, cpg->bdst); | |
5527c038 | 5535 | + h_dst_inode = d_inode(h_path.dentry); |
38d290e6 JR |
5536 | + spin_lock(&h_dst_inode->i_lock); |
5537 | + h_dst_inode->i_state |= I_LINKABLE; | |
5538 | + spin_unlock(&h_dst_inode->i_lock); | |
5539 | + } | |
1facf9fc | 5540 | + |
4f0767ce | 5541 | +out: |
1facf9fc | 5542 | + return err; |
5543 | +} | |
5544 | + | |
5545 | +static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, | |
5546 | + struct inode *h_dir) | |
5547 | +{ | |
5548 | + int err, symlen; | |
5549 | + mm_segment_t old_fs; | |
b752ccd1 AM |
5550 | + union { |
5551 | + char *k; | |
5552 | + char __user *u; | |
5553 | + } sym; | |
1facf9fc | 5554 | + |
5555 | + err = -ENOMEM; | |
537831f9 | 5556 | + sym.k = (void *)__get_free_page(GFP_NOFS); |
b752ccd1 | 5557 | + if (unlikely(!sym.k)) |
1facf9fc | 5558 | + goto out; |
5559 | + | |
9dbd164d | 5560 | + /* unnecessary to support mmap_sem since symlink is not mmap-able */ |
1facf9fc | 5561 | + old_fs = get_fs(); |
5562 | + set_fs(KERNEL_DS); | |
a2654f78 | 5563 | + symlen = vfs_readlink(h_src, sym.u, PATH_MAX); |
1facf9fc | 5564 | + err = symlen; |
5565 | + set_fs(old_fs); | |
5566 | + | |
5567 | + if (symlen > 0) { | |
b752ccd1 AM |
5568 | + sym.k[symlen] = 0; |
5569 | + err = vfsub_symlink(h_dir, h_path, sym.k); | |
1facf9fc | 5570 | + } |
1c60b727 | 5571 | + free_page((unsigned long)sym.k); |
1facf9fc | 5572 | + |
4f0767ce | 5573 | +out: |
1facf9fc | 5574 | + return err; |
5575 | +} | |
5576 | + | |
8cdd5066 JR |
5577 | +/* |
5578 | + * regardless 'acl' option, reset all ACL. | |
5579 | + * All ACL will be copied up later from the original entry on the lower branch. | |
5580 | + */ | |
5581 | +static int au_reset_acl(struct inode *h_dir, struct path *h_path, umode_t mode) | |
5582 | +{ | |
5583 | + int err; | |
5584 | + struct dentry *h_dentry; | |
5585 | + struct inode *h_inode; | |
5586 | + | |
5587 | + h_dentry = h_path->dentry; | |
5588 | + h_inode = d_inode(h_dentry); | |
5589 | + /* forget_all_cached_acls(h_inode)); */ | |
5590 | + err = vfsub_removexattr(h_dentry, XATTR_NAME_POSIX_ACL_ACCESS); | |
5591 | + AuTraceErr(err); | |
5592 | + if (err == -EOPNOTSUPP) | |
5593 | + err = 0; | |
5594 | + if (!err) | |
5595 | + err = vfsub_acl_chmod(h_inode, mode); | |
5596 | + | |
5597 | + AuTraceErr(err); | |
5598 | + return err; | |
5599 | +} | |
5600 | + | |
5601 | +static int au_do_cpup_dir(struct au_cp_generic *cpg, struct dentry *dst_parent, | |
5602 | + struct inode *h_dir, struct path *h_path) | |
5603 | +{ | |
5604 | + int err; | |
5605 | + struct inode *dir, *inode; | |
5606 | + | |
5607 | + err = vfsub_removexattr(h_path->dentry, XATTR_NAME_POSIX_ACL_DEFAULT); | |
5608 | + AuTraceErr(err); | |
5609 | + if (err == -EOPNOTSUPP) | |
5610 | + err = 0; | |
5611 | + if (unlikely(err)) | |
5612 | + goto out; | |
5613 | + | |
5614 | + /* | |
5615 | + * strange behaviour from the users view, | |
5616 | + * particularry setattr case | |
5617 | + */ | |
5618 | + dir = d_inode(dst_parent); | |
5afbbe0d | 5619 | + if (au_ibtop(dir) == cpg->bdst) |
8cdd5066 JR |
5620 | + au_cpup_attr_nlink(dir, /*force*/1); |
5621 | + inode = d_inode(cpg->dentry); | |
5622 | + au_cpup_attr_nlink(inode, /*force*/1); | |
5623 | + | |
5624 | +out: | |
5625 | + return err; | |
5626 | +} | |
5627 | + | |
1facf9fc | 5628 | +static noinline_for_stack |
c2b27bf2 | 5629 | +int cpup_entry(struct au_cp_generic *cpg, struct dentry *dst_parent, |
86dc4139 | 5630 | + struct au_cpup_reg_attr *h_src_attr) |
1facf9fc | 5631 | +{ |
5632 | + int err; | |
5633 | + umode_t mode; | |
5634 | + unsigned int mnt_flags; | |
076b876e | 5635 | + unsigned char isdir, isreg, force; |
c2b27bf2 | 5636 | + const unsigned char do_dt = !!au_ftest_cpup(cpg->flags, DTIME); |
1facf9fc | 5637 | + struct au_dtime dt; |
5638 | + struct path h_path; | |
5639 | + struct dentry *h_src, *h_dst, *h_parent; | |
8cdd5066 | 5640 | + struct inode *h_inode, *h_dir; |
1facf9fc | 5641 | + struct super_block *sb; |
5642 | + | |
5643 | + /* bsrc branch can be ro/rw. */ | |
c2b27bf2 | 5644 | + h_src = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 JR |
5645 | + h_inode = d_inode(h_src); |
5646 | + AuDebugOn(h_inode != au_h_iptr(d_inode(cpg->dentry), cpg->bsrc)); | |
1facf9fc | 5647 | + |
5648 | + /* try stopping to be referenced while we are creating */ | |
c2b27bf2 AM |
5649 | + h_dst = au_h_dptr(cpg->dentry, cpg->bdst); |
5650 | + if (au_ftest_cpup(cpg->flags, RENAME)) | |
86dc4139 AM |
5651 | + AuDebugOn(strncmp(h_dst->d_name.name, AUFS_WH_PFX, |
5652 | + AUFS_WH_PFX_LEN)); | |
1facf9fc | 5653 | + h_parent = h_dst->d_parent; /* dir inode is locked */ |
5527c038 | 5654 | + h_dir = d_inode(h_parent); |
1facf9fc | 5655 | + IMustLock(h_dir); |
5656 | + AuDebugOn(h_parent != h_dst->d_parent); | |
5657 | + | |
c2b27bf2 AM |
5658 | + sb = cpg->dentry->d_sb; |
5659 | + h_path.mnt = au_sbr_mnt(sb, cpg->bdst); | |
1facf9fc | 5660 | + if (do_dt) { |
5661 | + h_path.dentry = h_parent; | |
5662 | + au_dtime_store(&dt, dst_parent, &h_path); | |
5663 | + } | |
5664 | + h_path.dentry = h_dst; | |
5665 | + | |
076b876e | 5666 | + isreg = 0; |
1facf9fc | 5667 | + isdir = 0; |
5668 | + mode = h_inode->i_mode; | |
5669 | + switch (mode & S_IFMT) { | |
5670 | + case S_IFREG: | |
076b876e | 5671 | + isreg = 1; |
cd7a4cd9 | 5672 | + err = vfsub_create(h_dir, &h_path, 0600, /*want_excl*/true); |
1facf9fc | 5673 | + if (!err) |
c2b27bf2 | 5674 | + err = au_do_cpup_regular(cpg, h_src_attr); |
1facf9fc | 5675 | + break; |
5676 | + case S_IFDIR: | |
5677 | + isdir = 1; | |
5678 | + err = vfsub_mkdir(h_dir, &h_path, mode); | |
8cdd5066 JR |
5679 | + if (!err) |
5680 | + err = au_do_cpup_dir(cpg, dst_parent, h_dir, &h_path); | |
1facf9fc | 5681 | + break; |
5682 | + case S_IFLNK: | |
5683 | + err = au_do_cpup_symlink(&h_path, h_src, h_dir); | |
5684 | + break; | |
5685 | + case S_IFCHR: | |
5686 | + case S_IFBLK: | |
5687 | + AuDebugOn(!capable(CAP_MKNOD)); | |
5688 | + /*FALLTHROUGH*/ | |
5689 | + case S_IFIFO: | |
5690 | + case S_IFSOCK: | |
5691 | + err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); | |
5692 | + break; | |
5693 | + default: | |
5694 | + AuIOErr("Unknown inode type 0%o\n", mode); | |
5695 | + err = -EIO; | |
5696 | + } | |
8cdd5066 JR |
5697 | + if (!err) |
5698 | + err = au_reset_acl(h_dir, &h_path, mode); | |
1facf9fc | 5699 | + |
5700 | + mnt_flags = au_mntflags(sb); | |
5701 | + if (!au_opt_test(mnt_flags, UDBA_NONE) | |
5702 | + && !isdir | |
5703 | + && au_opt_test(mnt_flags, XINO) | |
38d290e6 JR |
5704 | + && (h_inode->i_nlink == 1 |
5705 | + || (h_inode->i_state & I_LINKABLE)) | |
1facf9fc | 5706 | + /* todo: unnecessary? */ |
5527c038 | 5707 | + /* && d_inode(cpg->dentry)->i_nlink == 1 */ |
c2b27bf2 AM |
5708 | + && cpg->bdst < cpg->bsrc |
5709 | + && !au_ftest_cpup(cpg->flags, KEEPLINO)) | |
5710 | + au_xino_write(sb, cpg->bsrc, h_inode->i_ino, /*ino*/0); | |
1facf9fc | 5711 | + /* ignore this error */ |
5712 | + | |
076b876e AM |
5713 | + if (!err) { |
5714 | + force = 0; | |
5715 | + if (isreg) { | |
5716 | + force = !!cpg->len; | |
5717 | + if (cpg->len == -1) | |
5718 | + force = !!i_size_read(h_inode); | |
5719 | + } | |
5720 | + au_fhsm_wrote(sb, cpg->bdst, force); | |
5721 | + } | |
5722 | + | |
1facf9fc | 5723 | + if (do_dt) |
5724 | + au_dtime_revert(&dt); | |
5725 | + return err; | |
5726 | +} | |
5727 | + | |
392086de | 5728 | +static int au_do_ren_after_cpup(struct au_cp_generic *cpg, struct path *h_path) |
86dc4139 AM |
5729 | +{ |
5730 | + int err; | |
392086de | 5731 | + struct dentry *dentry, *h_dentry, *h_parent, *parent; |
86dc4139 | 5732 | + struct inode *h_dir; |
392086de | 5733 | + aufs_bindex_t bdst; |
86dc4139 | 5734 | + |
392086de AM |
5735 | + dentry = cpg->dentry; |
5736 | + bdst = cpg->bdst; | |
5737 | + h_dentry = au_h_dptr(dentry, bdst); | |
5738 | + if (!au_ftest_cpup(cpg->flags, OVERWRITE)) { | |
5739 | + dget(h_dentry); | |
5740 | + au_set_h_dptr(dentry, bdst, NULL); | |
5741 | + err = au_lkup_neg(dentry, bdst, /*wh*/0); | |
5742 | + if (!err) | |
5743 | + h_path->dentry = dget(au_h_dptr(dentry, bdst)); | |
86dc4139 | 5744 | + au_set_h_dptr(dentry, bdst, h_dentry); |
392086de AM |
5745 | + } else { |
5746 | + err = 0; | |
5747 | + parent = dget_parent(dentry); | |
5748 | + h_parent = au_h_dptr(parent, bdst); | |
5749 | + dput(parent); | |
5750 | + h_path->dentry = vfsub_lkup_one(&dentry->d_name, h_parent); | |
5751 | + if (IS_ERR(h_path->dentry)) | |
5752 | + err = PTR_ERR(h_path->dentry); | |
86dc4139 | 5753 | + } |
392086de AM |
5754 | + if (unlikely(err)) |
5755 | + goto out; | |
86dc4139 | 5756 | + |
86dc4139 | 5757 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ |
5527c038 | 5758 | + h_dir = d_inode(h_parent); |
86dc4139 | 5759 | + IMustLock(h_dir); |
523b37e3 AM |
5760 | + AuDbg("%pd %pd\n", h_dentry, h_path->dentry); |
5761 | + /* no delegation since it is just created */ | |
f2c43d5f AM |
5762 | + err = vfsub_rename(h_dir, h_dentry, h_dir, h_path, /*delegated*/NULL, |
5763 | + /*flags*/0); | |
86dc4139 AM |
5764 | + dput(h_path->dentry); |
5765 | + | |
5766 | +out: | |
5767 | + return err; | |
5768 | +} | |
5769 | + | |
1facf9fc | 5770 | +/* |
5771 | + * copyup the @dentry from @bsrc to @bdst. | |
5772 | + * the caller must set the both of lower dentries. | |
5773 | + * @len is for truncating when it is -1 copyup the entire file. | |
5774 | + * in link/rename cases, @dst_parent may be different from the real one. | |
c2b27bf2 | 5775 | + * basic->bsrc can be larger than basic->bdst. |
f2c43d5f AM |
5776 | + * aufs doesn't touch the credential so |
5777 | + * security_inode_copy_up{,_xattr}() are unnecrssary. | |
1facf9fc | 5778 | + */ |
c2b27bf2 | 5779 | +static int au_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) |
1facf9fc | 5780 | +{ |
5781 | + int err, rerr; | |
5afbbe0d | 5782 | + aufs_bindex_t old_ibtop; |
1facf9fc | 5783 | + unsigned char isdir, plink; |
1facf9fc | 5784 | + struct dentry *h_src, *h_dst, *h_parent; |
5527c038 | 5785 | + struct inode *dst_inode, *h_dir, *inode, *delegated, *src_inode; |
1facf9fc | 5786 | + struct super_block *sb; |
86dc4139 | 5787 | + struct au_branch *br; |
c2b27bf2 AM |
5788 | + /* to reuduce stack size */ |
5789 | + struct { | |
5790 | + struct au_dtime dt; | |
5791 | + struct path h_path; | |
5792 | + struct au_cpup_reg_attr h_src_attr; | |
5793 | + } *a; | |
1facf9fc | 5794 | + |
c2b27bf2 AM |
5795 | + err = -ENOMEM; |
5796 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
5797 | + if (unlikely(!a)) | |
5798 | + goto out; | |
5799 | + a->h_src_attr.valid = 0; | |
1facf9fc | 5800 | + |
c2b27bf2 AM |
5801 | + sb = cpg->dentry->d_sb; |
5802 | + br = au_sbr(sb, cpg->bdst); | |
5803 | + a->h_path.mnt = au_br_mnt(br); | |
5804 | + h_dst = au_h_dptr(cpg->dentry, cpg->bdst); | |
1facf9fc | 5805 | + h_parent = h_dst->d_parent; /* dir inode is locked */ |
5527c038 | 5806 | + h_dir = d_inode(h_parent); |
1facf9fc | 5807 | + IMustLock(h_dir); |
5808 | + | |
c2b27bf2 | 5809 | + h_src = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 | 5810 | + inode = d_inode(cpg->dentry); |
1facf9fc | 5811 | + |
5812 | + if (!dst_parent) | |
c2b27bf2 | 5813 | + dst_parent = dget_parent(cpg->dentry); |
1facf9fc | 5814 | + else |
5815 | + dget(dst_parent); | |
5816 | + | |
5817 | + plink = !!au_opt_test(au_mntflags(sb), PLINK); | |
c2b27bf2 | 5818 | + dst_inode = au_h_iptr(inode, cpg->bdst); |
1facf9fc | 5819 | + if (dst_inode) { |
5820 | + if (unlikely(!plink)) { | |
5821 | + err = -EIO; | |
027c5e7a AM |
5822 | + AuIOErr("hi%lu(i%lu) exists on b%d " |
5823 | + "but plink is disabled\n", | |
c2b27bf2 AM |
5824 | + dst_inode->i_ino, inode->i_ino, cpg->bdst); |
5825 | + goto out_parent; | |
1facf9fc | 5826 | + } |
5827 | + | |
5828 | + if (dst_inode->i_nlink) { | |
c2b27bf2 | 5829 | + const int do_dt = au_ftest_cpup(cpg->flags, DTIME); |
1facf9fc | 5830 | + |
c2b27bf2 | 5831 | + h_src = au_plink_lkup(inode, cpg->bdst); |
1facf9fc | 5832 | + err = PTR_ERR(h_src); |
5833 | + if (IS_ERR(h_src)) | |
c2b27bf2 | 5834 | + goto out_parent; |
5527c038 | 5835 | + if (unlikely(d_is_negative(h_src))) { |
1facf9fc | 5836 | + err = -EIO; |
79b8bda9 | 5837 | + AuIOErr("i%lu exists on b%d " |
027c5e7a | 5838 | + "but not pseudo-linked\n", |
79b8bda9 | 5839 | + inode->i_ino, cpg->bdst); |
1facf9fc | 5840 | + dput(h_src); |
c2b27bf2 | 5841 | + goto out_parent; |
1facf9fc | 5842 | + } |
5843 | + | |
5844 | + if (do_dt) { | |
c2b27bf2 AM |
5845 | + a->h_path.dentry = h_parent; |
5846 | + au_dtime_store(&a->dt, dst_parent, &a->h_path); | |
1facf9fc | 5847 | + } |
86dc4139 | 5848 | + |
c2b27bf2 | 5849 | + a->h_path.dentry = h_dst; |
523b37e3 AM |
5850 | + delegated = NULL; |
5851 | + err = vfsub_link(h_src, h_dir, &a->h_path, &delegated); | |
c2b27bf2 | 5852 | + if (!err && au_ftest_cpup(cpg->flags, RENAME)) |
392086de | 5853 | + err = au_do_ren_after_cpup(cpg, &a->h_path); |
1facf9fc | 5854 | + if (do_dt) |
c2b27bf2 | 5855 | + au_dtime_revert(&a->dt); |
523b37e3 AM |
5856 | + if (unlikely(err == -EWOULDBLOCK)) { |
5857 | + pr_warn("cannot retry for NFSv4 delegation" | |
5858 | + " for an internal link\n"); | |
5859 | + iput(delegated); | |
5860 | + } | |
1facf9fc | 5861 | + dput(h_src); |
c2b27bf2 | 5862 | + goto out_parent; |
1facf9fc | 5863 | + } else |
5864 | + /* todo: cpup_wh_file? */ | |
5865 | + /* udba work */ | |
4a4d8108 | 5866 | + au_update_ibrange(inode, /*do_put_zero*/1); |
1facf9fc | 5867 | + } |
5868 | + | |
86dc4139 | 5869 | + isdir = S_ISDIR(inode->i_mode); |
5afbbe0d | 5870 | + old_ibtop = au_ibtop(inode); |
c2b27bf2 | 5871 | + err = cpup_entry(cpg, dst_parent, &a->h_src_attr); |
1facf9fc | 5872 | + if (unlikely(err)) |
86dc4139 | 5873 | + goto out_rev; |
5527c038 | 5874 | + dst_inode = d_inode(h_dst); |
febd17d6 | 5875 | + inode_lock_nested(dst_inode, AuLsc_I_CHILD2); |
86dc4139 | 5876 | + /* todo: necessary? */ |
c2b27bf2 | 5877 | + /* au_pin_hdir_unlock(cpg->pin); */ |
1facf9fc | 5878 | + |
c2b27bf2 | 5879 | + err = cpup_iattr(cpg->dentry, cpg->bdst, h_src, &a->h_src_attr); |
86dc4139 AM |
5880 | + if (unlikely(err)) { |
5881 | + /* todo: necessary? */ | |
c2b27bf2 | 5882 | + /* au_pin_hdir_relock(cpg->pin); */ /* ignore an error */ |
febd17d6 | 5883 | + inode_unlock(dst_inode); |
86dc4139 AM |
5884 | + goto out_rev; |
5885 | + } | |
5886 | + | |
5afbbe0d | 5887 | + if (cpg->bdst < old_ibtop) { |
86dc4139 | 5888 | + if (S_ISREG(inode->i_mode)) { |
c2b27bf2 | 5889 | + err = au_dy_iaop(inode, cpg->bdst, dst_inode); |
86dc4139 | 5890 | + if (unlikely(err)) { |
c2b27bf2 AM |
5891 | + /* ignore an error */ |
5892 | + /* au_pin_hdir_relock(cpg->pin); */ | |
febd17d6 | 5893 | + inode_unlock(dst_inode); |
86dc4139 | 5894 | + goto out_rev; |
4a4d8108 | 5895 | + } |
4a4d8108 | 5896 | + } |
5afbbe0d | 5897 | + au_set_ibtop(inode, cpg->bdst); |
c2b27bf2 | 5898 | + } else |
5afbbe0d | 5899 | + au_set_ibbot(inode, cpg->bdst); |
c2b27bf2 | 5900 | + au_set_h_iptr(inode, cpg->bdst, au_igrab(dst_inode), |
86dc4139 AM |
5901 | + au_hi_flags(inode, isdir)); |
5902 | + | |
5903 | + /* todo: necessary? */ | |
c2b27bf2 | 5904 | + /* err = au_pin_hdir_relock(cpg->pin); */ |
febd17d6 | 5905 | + inode_unlock(dst_inode); |
86dc4139 AM |
5906 | + if (unlikely(err)) |
5907 | + goto out_rev; | |
5908 | + | |
5527c038 | 5909 | + src_inode = d_inode(h_src); |
86dc4139 | 5910 | + if (!isdir |
5527c038 JR |
5911 | + && (src_inode->i_nlink > 1 |
5912 | + || src_inode->i_state & I_LINKABLE) | |
86dc4139 | 5913 | + && plink) |
c2b27bf2 | 5914 | + au_plink_append(inode, cpg->bdst, h_dst); |
86dc4139 | 5915 | + |
c2b27bf2 AM |
5916 | + if (au_ftest_cpup(cpg->flags, RENAME)) { |
5917 | + a->h_path.dentry = h_dst; | |
392086de | 5918 | + err = au_do_ren_after_cpup(cpg, &a->h_path); |
86dc4139 AM |
5919 | + } |
5920 | + if (!err) | |
c2b27bf2 | 5921 | + goto out_parent; /* success */ |
1facf9fc | 5922 | + |
5923 | + /* revert */ | |
4a4d8108 | 5924 | +out_rev: |
c2b27bf2 AM |
5925 | + a->h_path.dentry = h_parent; |
5926 | + au_dtime_store(&a->dt, dst_parent, &a->h_path); | |
5927 | + a->h_path.dentry = h_dst; | |
86dc4139 | 5928 | + rerr = 0; |
5527c038 | 5929 | + if (d_is_positive(h_dst)) { |
523b37e3 AM |
5930 | + if (!isdir) { |
5931 | + /* no delegation since it is just created */ | |
5932 | + rerr = vfsub_unlink(h_dir, &a->h_path, | |
5933 | + /*delegated*/NULL, /*force*/0); | |
5934 | + } else | |
c2b27bf2 | 5935 | + rerr = vfsub_rmdir(h_dir, &a->h_path); |
86dc4139 | 5936 | + } |
c2b27bf2 | 5937 | + au_dtime_revert(&a->dt); |
1facf9fc | 5938 | + if (rerr) { |
5939 | + AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); | |
5940 | + err = -EIO; | |
5941 | + } | |
c2b27bf2 | 5942 | +out_parent: |
1facf9fc | 5943 | + dput(dst_parent); |
1c60b727 | 5944 | + kfree(a); |
c2b27bf2 | 5945 | +out: |
1facf9fc | 5946 | + return err; |
5947 | +} | |
5948 | + | |
7e9cd9fe | 5949 | +#if 0 /* reserved */ |
1facf9fc | 5950 | +struct au_cpup_single_args { |
5951 | + int *errp; | |
c2b27bf2 | 5952 | + struct au_cp_generic *cpg; |
1facf9fc | 5953 | + struct dentry *dst_parent; |
5954 | +}; | |
5955 | + | |
5956 | +static void au_call_cpup_single(void *args) | |
5957 | +{ | |
5958 | + struct au_cpup_single_args *a = args; | |
86dc4139 | 5959 | + |
c2b27bf2 AM |
5960 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
5961 | + *a->errp = au_cpup_single(a->cpg, a->dst_parent); | |
5962 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 5963 | +} |
c2b27bf2 | 5964 | +#endif |
1facf9fc | 5965 | + |
53392da6 AM |
5966 | +/* |
5967 | + * prevent SIGXFSZ in copy-up. | |
5968 | + * testing CAP_MKNOD is for generic fs, | |
5969 | + * but CAP_FSETID is for xfs only, currently. | |
5970 | + */ | |
86dc4139 | 5971 | +static int au_cpup_sio_test(struct au_pin *pin, umode_t mode) |
53392da6 AM |
5972 | +{ |
5973 | + int do_sio; | |
86dc4139 AM |
5974 | + struct super_block *sb; |
5975 | + struct inode *h_dir; | |
53392da6 AM |
5976 | + |
5977 | + do_sio = 0; | |
86dc4139 | 5978 | + sb = au_pinned_parent(pin)->d_sb; |
53392da6 AM |
5979 | + if (!au_wkq_test() |
5980 | + && (!au_sbi(sb)->si_plink_maint_pid | |
5981 | + || au_plink_maint(sb, AuLock_NOPLM))) { | |
5982 | + switch (mode & S_IFMT) { | |
5983 | + case S_IFREG: | |
5984 | + /* no condition about RLIMIT_FSIZE and the file size */ | |
5985 | + do_sio = 1; | |
5986 | + break; | |
5987 | + case S_IFCHR: | |
5988 | + case S_IFBLK: | |
5989 | + do_sio = !capable(CAP_MKNOD); | |
5990 | + break; | |
5991 | + } | |
5992 | + if (!do_sio) | |
5993 | + do_sio = ((mode & (S_ISUID | S_ISGID)) | |
5994 | + && !capable(CAP_FSETID)); | |
86dc4139 AM |
5995 | + /* this workaround may be removed in the future */ |
5996 | + if (!do_sio) { | |
5997 | + h_dir = au_pinned_h_dir(pin); | |
5998 | + do_sio = h_dir->i_mode & S_ISVTX; | |
5999 | + } | |
53392da6 AM |
6000 | + } |
6001 | + | |
6002 | + return do_sio; | |
6003 | +} | |
6004 | + | |
7e9cd9fe | 6005 | +#if 0 /* reserved */ |
c2b27bf2 | 6006 | +int au_sio_cpup_single(struct au_cp_generic *cpg, struct dentry *dst_parent) |
1facf9fc | 6007 | +{ |
6008 | + int err, wkq_err; | |
1facf9fc | 6009 | + struct dentry *h_dentry; |
6010 | + | |
c2b27bf2 | 6011 | + h_dentry = au_h_dptr(cpg->dentry, cpg->bsrc); |
5527c038 | 6012 | + if (!au_cpup_sio_test(pin, d_inode(h_dentry)->i_mode)) |
c2b27bf2 | 6013 | + err = au_cpup_single(cpg, dst_parent); |
1facf9fc | 6014 | + else { |
6015 | + struct au_cpup_single_args args = { | |
6016 | + .errp = &err, | |
c2b27bf2 AM |
6017 | + .cpg = cpg, |
6018 | + .dst_parent = dst_parent | |
1facf9fc | 6019 | + }; |
6020 | + wkq_err = au_wkq_wait(au_call_cpup_single, &args); | |
6021 | + if (unlikely(wkq_err)) | |
6022 | + err = wkq_err; | |
6023 | + } | |
6024 | + | |
6025 | + return err; | |
6026 | +} | |
c2b27bf2 | 6027 | +#endif |
1facf9fc | 6028 | + |
6029 | +/* | |
6030 | + * copyup the @dentry from the first active lower branch to @bdst, | |
6031 | + * using au_cpup_single(). | |
6032 | + */ | |
c2b27bf2 | 6033 | +static int au_cpup_simple(struct au_cp_generic *cpg) |
1facf9fc | 6034 | +{ |
6035 | + int err; | |
c2b27bf2 AM |
6036 | + unsigned int flags_orig; |
6037 | + struct dentry *dentry; | |
6038 | + | |
6039 | + AuDebugOn(cpg->bsrc < 0); | |
1facf9fc | 6040 | + |
c2b27bf2 | 6041 | + dentry = cpg->dentry; |
86dc4139 | 6042 | + DiMustWriteLock(dentry); |
1facf9fc | 6043 | + |
c2b27bf2 | 6044 | + err = au_lkup_neg(dentry, cpg->bdst, /*wh*/1); |
1facf9fc | 6045 | + if (!err) { |
c2b27bf2 AM |
6046 | + flags_orig = cpg->flags; |
6047 | + au_fset_cpup(cpg->flags, RENAME); | |
6048 | + err = au_cpup_single(cpg, NULL); | |
6049 | + cpg->flags = flags_orig; | |
1facf9fc | 6050 | + if (!err) |
6051 | + return 0; /* success */ | |
6052 | + | |
6053 | + /* revert */ | |
c2b27bf2 | 6054 | + au_set_h_dptr(dentry, cpg->bdst, NULL); |
5afbbe0d | 6055 | + au_set_dbtop(dentry, cpg->bsrc); |
1facf9fc | 6056 | + } |
6057 | + | |
6058 | + return err; | |
6059 | +} | |
6060 | + | |
6061 | +struct au_cpup_simple_args { | |
6062 | + int *errp; | |
c2b27bf2 | 6063 | + struct au_cp_generic *cpg; |
1facf9fc | 6064 | +}; |
6065 | + | |
6066 | +static void au_call_cpup_simple(void *args) | |
6067 | +{ | |
6068 | + struct au_cpup_simple_args *a = args; | |
86dc4139 | 6069 | + |
c2b27bf2 AM |
6070 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
6071 | + *a->errp = au_cpup_simple(a->cpg); | |
6072 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 6073 | +} |
6074 | + | |
c2b27bf2 | 6075 | +static int au_do_sio_cpup_simple(struct au_cp_generic *cpg) |
1facf9fc | 6076 | +{ |
6077 | + int err, wkq_err; | |
c2b27bf2 AM |
6078 | + struct dentry *dentry, *parent; |
6079 | + struct file *h_file; | |
1facf9fc | 6080 | + struct inode *h_dir; |
6081 | + | |
c2b27bf2 AM |
6082 | + dentry = cpg->dentry; |
6083 | + h_file = NULL; | |
6084 | + if (au_ftest_cpup(cpg->flags, HOPEN)) { | |
6085 | + AuDebugOn(cpg->bsrc < 0); | |
392086de | 6086 | + h_file = au_h_open_pre(dentry, cpg->bsrc, /*force_wr*/0); |
c2b27bf2 AM |
6087 | + err = PTR_ERR(h_file); |
6088 | + if (IS_ERR(h_file)) | |
6089 | + goto out; | |
6090 | + } | |
6091 | + | |
1facf9fc | 6092 | + parent = dget_parent(dentry); |
5527c038 | 6093 | + h_dir = au_h_iptr(d_inode(parent), cpg->bdst); |
53392da6 | 6094 | + if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE) |
5527c038 | 6095 | + && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) |
c2b27bf2 | 6096 | + err = au_cpup_simple(cpg); |
1facf9fc | 6097 | + else { |
6098 | + struct au_cpup_simple_args args = { | |
6099 | + .errp = &err, | |
c2b27bf2 | 6100 | + .cpg = cpg |
1facf9fc | 6101 | + }; |
6102 | + wkq_err = au_wkq_wait(au_call_cpup_simple, &args); | |
6103 | + if (unlikely(wkq_err)) | |
6104 | + err = wkq_err; | |
6105 | + } | |
6106 | + | |
6107 | + dput(parent); | |
c2b27bf2 AM |
6108 | + if (h_file) |
6109 | + au_h_open_post(dentry, cpg->bsrc, h_file); | |
6110 | + | |
6111 | +out: | |
1facf9fc | 6112 | + return err; |
6113 | +} | |
6114 | + | |
c2b27bf2 | 6115 | +int au_sio_cpup_simple(struct au_cp_generic *cpg) |
367653fa | 6116 | +{ |
5afbbe0d | 6117 | + aufs_bindex_t bsrc, bbot; |
c2b27bf2 | 6118 | + struct dentry *dentry, *h_dentry; |
367653fa | 6119 | + |
c2b27bf2 AM |
6120 | + if (cpg->bsrc < 0) { |
6121 | + dentry = cpg->dentry; | |
5afbbe0d AM |
6122 | + bbot = au_dbbot(dentry); |
6123 | + for (bsrc = cpg->bdst + 1; bsrc <= bbot; bsrc++) { | |
c2b27bf2 AM |
6124 | + h_dentry = au_h_dptr(dentry, bsrc); |
6125 | + if (h_dentry) { | |
5527c038 | 6126 | + AuDebugOn(d_is_negative(h_dentry)); |
c2b27bf2 AM |
6127 | + break; |
6128 | + } | |
6129 | + } | |
5afbbe0d | 6130 | + AuDebugOn(bsrc > bbot); |
c2b27bf2 | 6131 | + cpg->bsrc = bsrc; |
367653fa | 6132 | + } |
c2b27bf2 AM |
6133 | + AuDebugOn(cpg->bsrc <= cpg->bdst); |
6134 | + return au_do_sio_cpup_simple(cpg); | |
6135 | +} | |
367653fa | 6136 | + |
c2b27bf2 AM |
6137 | +int au_sio_cpdown_simple(struct au_cp_generic *cpg) |
6138 | +{ | |
6139 | + AuDebugOn(cpg->bdst <= cpg->bsrc); | |
6140 | + return au_do_sio_cpup_simple(cpg); | |
367653fa AM |
6141 | +} |
6142 | + | |
1facf9fc | 6143 | +/* ---------------------------------------------------------------------- */ |
6144 | + | |
6145 | +/* | |
6146 | + * copyup the deleted file for writing. | |
6147 | + */ | |
c2b27bf2 AM |
6148 | +static int au_do_cpup_wh(struct au_cp_generic *cpg, struct dentry *wh_dentry, |
6149 | + struct file *file) | |
1facf9fc | 6150 | +{ |
6151 | + int err; | |
c2b27bf2 AM |
6152 | + unsigned int flags_orig; |
6153 | + aufs_bindex_t bsrc_orig; | |
c2b27bf2 | 6154 | + struct au_dinfo *dinfo; |
5afbbe0d AM |
6155 | + struct { |
6156 | + struct au_hdentry *hd; | |
6157 | + struct dentry *h_dentry; | |
6158 | + } hdst, hsrc; | |
1facf9fc | 6159 | + |
c2b27bf2 | 6160 | + dinfo = au_di(cpg->dentry); |
1308ab2a | 6161 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
6162 | + | |
c2b27bf2 | 6163 | + bsrc_orig = cpg->bsrc; |
5afbbe0d AM |
6164 | + cpg->bsrc = dinfo->di_btop; |
6165 | + hdst.hd = au_hdentry(dinfo, cpg->bdst); | |
6166 | + hdst.h_dentry = hdst.hd->hd_dentry; | |
6167 | + hdst.hd->hd_dentry = wh_dentry; | |
6168 | + dinfo->di_btop = cpg->bdst; | |
6169 | + | |
6170 | + hsrc.h_dentry = NULL; | |
027c5e7a | 6171 | + if (file) { |
5afbbe0d AM |
6172 | + hsrc.hd = au_hdentry(dinfo, cpg->bsrc); |
6173 | + hsrc.h_dentry = hsrc.hd->hd_dentry; | |
6174 | + hsrc.hd->hd_dentry = au_hf_top(file)->f_path.dentry; | |
027c5e7a | 6175 | + } |
c2b27bf2 AM |
6176 | + flags_orig = cpg->flags; |
6177 | + cpg->flags = !AuCpup_DTIME; | |
6178 | + err = au_cpup_single(cpg, /*h_parent*/NULL); | |
6179 | + cpg->flags = flags_orig; | |
027c5e7a AM |
6180 | + if (file) { |
6181 | + if (!err) | |
6182 | + err = au_reopen_nondir(file); | |
5afbbe0d | 6183 | + hsrc.hd->hd_dentry = hsrc.h_dentry; |
1facf9fc | 6184 | + } |
5afbbe0d AM |
6185 | + hdst.hd->hd_dentry = hdst.h_dentry; |
6186 | + dinfo->di_btop = cpg->bsrc; | |
c2b27bf2 | 6187 | + cpg->bsrc = bsrc_orig; |
1facf9fc | 6188 | + |
6189 | + return err; | |
6190 | +} | |
6191 | + | |
c2b27bf2 | 6192 | +static int au_cpup_wh(struct au_cp_generic *cpg, struct file *file) |
1facf9fc | 6193 | +{ |
6194 | + int err; | |
c2b27bf2 | 6195 | + aufs_bindex_t bdst; |
1facf9fc | 6196 | + struct au_dtime dt; |
c2b27bf2 | 6197 | + struct dentry *dentry, *parent, *h_parent, *wh_dentry; |
1facf9fc | 6198 | + struct au_branch *br; |
6199 | + struct path h_path; | |
6200 | + | |
c2b27bf2 AM |
6201 | + dentry = cpg->dentry; |
6202 | + bdst = cpg->bdst; | |
1facf9fc | 6203 | + br = au_sbr(dentry->d_sb, bdst); |
6204 | + parent = dget_parent(dentry); | |
6205 | + h_parent = au_h_dptr(parent, bdst); | |
6206 | + wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
6207 | + err = PTR_ERR(wh_dentry); | |
6208 | + if (IS_ERR(wh_dentry)) | |
6209 | + goto out; | |
6210 | + | |
6211 | + h_path.dentry = h_parent; | |
86dc4139 | 6212 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 6213 | + au_dtime_store(&dt, parent, &h_path); |
c2b27bf2 | 6214 | + err = au_do_cpup_wh(cpg, wh_dentry, file); |
1facf9fc | 6215 | + if (unlikely(err)) |
6216 | + goto out_wh; | |
6217 | + | |
6218 | + dget(wh_dentry); | |
6219 | + h_path.dentry = wh_dentry; | |
2000de60 | 6220 | + if (!d_is_dir(wh_dentry)) { |
523b37e3 | 6221 | + /* no delegation since it is just created */ |
5527c038 | 6222 | + err = vfsub_unlink(d_inode(h_parent), &h_path, |
523b37e3 AM |
6223 | + /*delegated*/NULL, /*force*/0); |
6224 | + } else | |
5527c038 | 6225 | + err = vfsub_rmdir(d_inode(h_parent), &h_path); |
1facf9fc | 6226 | + if (unlikely(err)) { |
523b37e3 AM |
6227 | + AuIOErr("failed remove copied-up tmp file %pd(%d)\n", |
6228 | + wh_dentry, err); | |
1facf9fc | 6229 | + err = -EIO; |
6230 | + } | |
6231 | + au_dtime_revert(&dt); | |
5527c038 | 6232 | + au_set_hi_wh(d_inode(dentry), bdst, wh_dentry); |
1facf9fc | 6233 | + |
4f0767ce | 6234 | +out_wh: |
1facf9fc | 6235 | + dput(wh_dentry); |
4f0767ce | 6236 | +out: |
1facf9fc | 6237 | + dput(parent); |
6238 | + return err; | |
6239 | +} | |
6240 | + | |
6241 | +struct au_cpup_wh_args { | |
6242 | + int *errp; | |
c2b27bf2 | 6243 | + struct au_cp_generic *cpg; |
1facf9fc | 6244 | + struct file *file; |
6245 | +}; | |
6246 | + | |
6247 | +static void au_call_cpup_wh(void *args) | |
6248 | +{ | |
6249 | + struct au_cpup_wh_args *a = args; | |
86dc4139 | 6250 | + |
c2b27bf2 AM |
6251 | + au_pin_hdir_acquire_nest(a->cpg->pin); |
6252 | + *a->errp = au_cpup_wh(a->cpg, a->file); | |
6253 | + au_pin_hdir_release(a->cpg->pin); | |
1facf9fc | 6254 | +} |
6255 | + | |
c2b27bf2 | 6256 | +int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file) |
1facf9fc | 6257 | +{ |
6258 | + int err, wkq_err; | |
c2b27bf2 | 6259 | + aufs_bindex_t bdst; |
c1595e42 | 6260 | + struct dentry *dentry, *parent, *h_orph, *h_parent; |
86dc4139 | 6261 | + struct inode *dir, *h_dir, *h_tmpdir; |
1facf9fc | 6262 | + struct au_wbr *wbr; |
c2b27bf2 | 6263 | + struct au_pin wh_pin, *pin_orig; |
1facf9fc | 6264 | + |
c2b27bf2 AM |
6265 | + dentry = cpg->dentry; |
6266 | + bdst = cpg->bdst; | |
1facf9fc | 6267 | + parent = dget_parent(dentry); |
5527c038 | 6268 | + dir = d_inode(parent); |
1facf9fc | 6269 | + h_orph = NULL; |
6270 | + h_parent = NULL; | |
6271 | + h_dir = au_igrab(au_h_iptr(dir, bdst)); | |
6272 | + h_tmpdir = h_dir; | |
c2b27bf2 | 6273 | + pin_orig = NULL; |
1facf9fc | 6274 | + if (!h_dir->i_nlink) { |
6275 | + wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; | |
6276 | + h_orph = wbr->wbr_orph; | |
6277 | + | |
6278 | + h_parent = dget(au_h_dptr(parent, bdst)); | |
1facf9fc | 6279 | + au_set_h_dptr(parent, bdst, dget(h_orph)); |
5527c038 | 6280 | + h_tmpdir = d_inode(h_orph); |
1facf9fc | 6281 | + au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); |
6282 | + | |
febd17d6 | 6283 | + inode_lock_nested(h_tmpdir, AuLsc_I_PARENT3); |
4a4d8108 | 6284 | + /* todo: au_h_open_pre()? */ |
86dc4139 | 6285 | + |
c2b27bf2 | 6286 | + pin_orig = cpg->pin; |
86dc4139 | 6287 | + au_pin_init(&wh_pin, dentry, bdst, AuLsc_DI_PARENT, |
c2b27bf2 AM |
6288 | + AuLsc_I_PARENT3, cpg->pin->udba, AuPin_DI_LOCKED); |
6289 | + cpg->pin = &wh_pin; | |
1facf9fc | 6290 | + } |
6291 | + | |
53392da6 | 6292 | + if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE) |
5527c038 | 6293 | + && !au_cpup_sio_test(cpg->pin, d_inode(dentry)->i_mode)) |
c2b27bf2 | 6294 | + err = au_cpup_wh(cpg, file); |
1facf9fc | 6295 | + else { |
6296 | + struct au_cpup_wh_args args = { | |
6297 | + .errp = &err, | |
c2b27bf2 AM |
6298 | + .cpg = cpg, |
6299 | + .file = file | |
1facf9fc | 6300 | + }; |
6301 | + wkq_err = au_wkq_wait(au_call_cpup_wh, &args); | |
6302 | + if (unlikely(wkq_err)) | |
6303 | + err = wkq_err; | |
6304 | + } | |
6305 | + | |
6306 | + if (h_orph) { | |
febd17d6 | 6307 | + inode_unlock(h_tmpdir); |
4a4d8108 | 6308 | + /* todo: au_h_open_post()? */ |
1facf9fc | 6309 | + au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); |
1facf9fc | 6310 | + au_set_h_dptr(parent, bdst, h_parent); |
c2b27bf2 AM |
6311 | + AuDebugOn(!pin_orig); |
6312 | + cpg->pin = pin_orig; | |
1facf9fc | 6313 | + } |
6314 | + iput(h_dir); | |
6315 | + dput(parent); | |
6316 | + | |
6317 | + return err; | |
6318 | +} | |
6319 | + | |
6320 | +/* ---------------------------------------------------------------------- */ | |
6321 | + | |
6322 | +/* | |
6323 | + * generic routine for both of copy-up and copy-down. | |
6324 | + */ | |
6325 | +/* cf. revalidate function in file.c */ | |
6326 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
6327 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6328 | + struct au_pin *pin, |
1facf9fc | 6329 | + struct dentry *h_parent, void *arg), |
6330 | + void *arg) | |
6331 | +{ | |
6332 | + int err; | |
6333 | + struct au_pin pin; | |
5527c038 | 6334 | + struct dentry *d, *parent, *h_parent, *real_parent, *h_dentry; |
1facf9fc | 6335 | + |
6336 | + err = 0; | |
6337 | + parent = dget_parent(dentry); | |
6338 | + if (IS_ROOT(parent)) | |
6339 | + goto out; | |
6340 | + | |
6341 | + au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, | |
6342 | + au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); | |
6343 | + | |
6344 | + /* do not use au_dpage */ | |
6345 | + real_parent = parent; | |
6346 | + while (1) { | |
6347 | + dput(parent); | |
6348 | + parent = dget_parent(dentry); | |
6349 | + h_parent = au_h_dptr(parent, bdst); | |
6350 | + if (h_parent) | |
6351 | + goto out; /* success */ | |
6352 | + | |
6353 | + /* find top dir which is necessary to cpup */ | |
6354 | + do { | |
6355 | + d = parent; | |
6356 | + dput(parent); | |
6357 | + parent = dget_parent(d); | |
6358 | + di_read_lock_parent3(parent, !AuLock_IR); | |
6359 | + h_parent = au_h_dptr(parent, bdst); | |
6360 | + di_read_unlock(parent, !AuLock_IR); | |
6361 | + } while (!h_parent); | |
6362 | + | |
6363 | + if (d != real_parent) | |
6364 | + di_write_lock_child3(d); | |
6365 | + | |
6366 | + /* somebody else might create while we were sleeping */ | |
5527c038 JR |
6367 | + h_dentry = au_h_dptr(d, bdst); |
6368 | + if (!h_dentry || d_is_negative(h_dentry)) { | |
6369 | + if (h_dentry) | |
5afbbe0d | 6370 | + au_update_dbtop(d); |
1facf9fc | 6371 | + |
6372 | + au_pin_set_dentry(&pin, d); | |
6373 | + err = au_do_pin(&pin); | |
6374 | + if (!err) { | |
86dc4139 | 6375 | + err = cp(d, bdst, &pin, h_parent, arg); |
1facf9fc | 6376 | + au_unpin(&pin); |
6377 | + } | |
6378 | + } | |
6379 | + | |
6380 | + if (d != real_parent) | |
6381 | + di_write_unlock(d); | |
6382 | + if (unlikely(err)) | |
6383 | + break; | |
6384 | + } | |
6385 | + | |
4f0767ce | 6386 | +out: |
1facf9fc | 6387 | + dput(parent); |
6388 | + return err; | |
6389 | +} | |
6390 | + | |
6391 | +static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6392 | + struct au_pin *pin, |
2000de60 | 6393 | + struct dentry *h_parent __maybe_unused, |
1facf9fc | 6394 | + void *arg __maybe_unused) |
6395 | +{ | |
c2b27bf2 AM |
6396 | + struct au_cp_generic cpg = { |
6397 | + .dentry = dentry, | |
6398 | + .bdst = bdst, | |
6399 | + .bsrc = -1, | |
6400 | + .len = 0, | |
6401 | + .pin = pin, | |
6402 | + .flags = AuCpup_DTIME | |
6403 | + }; | |
6404 | + return au_sio_cpup_simple(&cpg); | |
1facf9fc | 6405 | +} |
6406 | + | |
6407 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
6408 | +{ | |
6409 | + return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); | |
6410 | +} | |
6411 | + | |
6412 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
6413 | +{ | |
6414 | + int err; | |
6415 | + struct dentry *parent; | |
6416 | + struct inode *dir; | |
6417 | + | |
6418 | + parent = dget_parent(dentry); | |
5527c038 | 6419 | + dir = d_inode(parent); |
1facf9fc | 6420 | + err = 0; |
6421 | + if (au_h_iptr(dir, bdst)) | |
6422 | + goto out; | |
6423 | + | |
6424 | + di_read_unlock(parent, AuLock_IR); | |
6425 | + di_write_lock_parent(parent); | |
6426 | + /* someone else might change our inode while we were sleeping */ | |
6427 | + if (!au_h_iptr(dir, bdst)) | |
6428 | + err = au_cpup_dirs(dentry, bdst); | |
6429 | + di_downgrade_lock(parent, AuLock_IR); | |
6430 | + | |
4f0767ce | 6431 | +out: |
1facf9fc | 6432 | + dput(parent); |
6433 | + return err; | |
6434 | +} | |
7f207e10 AM |
6435 | diff -urN /usr/share/empty/fs/aufs/cpup.h linux/fs/aufs/cpup.h |
6436 | --- /usr/share/empty/fs/aufs/cpup.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 6437 | +++ linux/fs/aufs/cpup.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
6438 | @@ -0,0 +1,100 @@ |
6439 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 6440 | +/* |
b00004a5 | 6441 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 6442 | + * |
6443 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6444 | + * it under the terms of the GNU General Public License as published by | |
6445 | + * the Free Software Foundation; either version 2 of the License, or | |
6446 | + * (at your option) any later version. | |
dece6358 AM |
6447 | + * |
6448 | + * This program is distributed in the hope that it will be useful, | |
6449 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6450 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6451 | + * GNU General Public License for more details. | |
6452 | + * | |
6453 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 6454 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 6455 | + */ |
6456 | + | |
6457 | +/* | |
6458 | + * copy-up/down functions | |
6459 | + */ | |
6460 | + | |
6461 | +#ifndef __AUFS_CPUP_H__ | |
6462 | +#define __AUFS_CPUP_H__ | |
6463 | + | |
6464 | +#ifdef __KERNEL__ | |
6465 | + | |
dece6358 | 6466 | +#include <linux/path.h> |
1facf9fc | 6467 | + |
dece6358 AM |
6468 | +struct inode; |
6469 | +struct file; | |
86dc4139 | 6470 | +struct au_pin; |
dece6358 | 6471 | + |
86dc4139 | 6472 | +void au_cpup_attr_flags(struct inode *dst, unsigned int iflags); |
1facf9fc | 6473 | +void au_cpup_attr_timesizes(struct inode *inode); |
6474 | +void au_cpup_attr_nlink(struct inode *inode, int force); | |
6475 | +void au_cpup_attr_changeable(struct inode *inode); | |
6476 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode); | |
6477 | +void au_cpup_attr_all(struct inode *inode, int force); | |
6478 | + | |
6479 | +/* ---------------------------------------------------------------------- */ | |
6480 | + | |
c2b27bf2 AM |
6481 | +struct au_cp_generic { |
6482 | + struct dentry *dentry; | |
6483 | + aufs_bindex_t bdst, bsrc; | |
6484 | + loff_t len; | |
6485 | + struct au_pin *pin; | |
6486 | + unsigned int flags; | |
6487 | +}; | |
6488 | + | |
1facf9fc | 6489 | +/* cpup flags */ |
392086de AM |
6490 | +#define AuCpup_DTIME 1 /* do dtime_store/revert */ |
6491 | +#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino, | |
6492 | + for link(2) */ | |
6493 | +#define AuCpup_RENAME (1 << 2) /* rename after cpup */ | |
6494 | +#define AuCpup_HOPEN (1 << 3) /* call h_open_pre/post() in | |
6495 | + cpup */ | |
6496 | +#define AuCpup_OVERWRITE (1 << 4) /* allow overwriting the | |
6497 | + existing entry */ | |
6498 | +#define AuCpup_RWDST (1 << 5) /* force write target even if | |
6499 | + the branch is marked as RO */ | |
c2b27bf2 | 6500 | + |
8b6a4947 AM |
6501 | +#ifndef CONFIG_AUFS_BR_HFSPLUS |
6502 | +#undef AuCpup_HOPEN | |
6503 | +#define AuCpup_HOPEN 0 | |
6504 | +#endif | |
6505 | + | |
1facf9fc | 6506 | +#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name) |
7f207e10 AM |
6507 | +#define au_fset_cpup(flags, name) \ |
6508 | + do { (flags) |= AuCpup_##name; } while (0) | |
6509 | +#define au_fclr_cpup(flags, name) \ | |
6510 | + do { (flags) &= ~AuCpup_##name; } while (0) | |
1facf9fc | 6511 | + |
6512 | +int au_copy_file(struct file *dst, struct file *src, loff_t len); | |
c2b27bf2 AM |
6513 | +int au_sio_cpup_simple(struct au_cp_generic *cpg); |
6514 | +int au_sio_cpdown_simple(struct au_cp_generic *cpg); | |
6515 | +int au_sio_cpup_wh(struct au_cp_generic *cpg, struct file *file); | |
1facf9fc | 6516 | + |
6517 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
6518 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 6519 | + struct au_pin *pin, |
1facf9fc | 6520 | + struct dentry *h_parent, void *arg), |
6521 | + void *arg); | |
6522 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
6523 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
6524 | + | |
6525 | +/* ---------------------------------------------------------------------- */ | |
6526 | + | |
6527 | +/* keep timestamps when copyup */ | |
6528 | +struct au_dtime { | |
6529 | + struct dentry *dt_dentry; | |
6530 | + struct path dt_h_path; | |
cd7a4cd9 | 6531 | + struct timespec64 dt_atime, dt_mtime; |
1facf9fc | 6532 | +}; |
6533 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
6534 | + struct path *h_path); | |
6535 | +void au_dtime_revert(struct au_dtime *dt); | |
6536 | + | |
6537 | +#endif /* __KERNEL__ */ | |
6538 | +#endif /* __AUFS_CPUP_H__ */ | |
7f207e10 AM |
6539 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.c linux/fs/aufs/dbgaufs.c |
6540 | --- /usr/share/empty/fs/aufs/dbgaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 6541 | +++ linux/fs/aufs/dbgaufs.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 6542 | @@ -0,0 +1,478 @@ |
cd7a4cd9 | 6543 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 6544 | +/* |
b00004a5 | 6545 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 6546 | + * |
6547 | + * This program, aufs is free software; you can redistribute it and/or modify | |
6548 | + * it under the terms of the GNU General Public License as published by | |
6549 | + * the Free Software Foundation; either version 2 of the License, or | |
6550 | + * (at your option) any later version. | |
dece6358 AM |
6551 | + * |
6552 | + * This program is distributed in the hope that it will be useful, | |
6553 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
6554 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
6555 | + * GNU General Public License for more details. | |
6556 | + * | |
6557 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 6558 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 6559 | + */ |
6560 | + | |
6561 | +/* | |
6562 | + * debugfs interface | |
6563 | + */ | |
6564 | + | |
6565 | +#include <linux/debugfs.h> | |
6566 | +#include "aufs.h" | |
6567 | + | |
6568 | +#ifndef CONFIG_SYSFS | |
6569 | +#error DEBUG_FS depends upon SYSFS | |
6570 | +#endif | |
6571 | + | |
6572 | +static struct dentry *dbgaufs; | |
cd7a4cd9 | 6573 | +static const mode_t dbgaufs_mode = 0444; |
1facf9fc | 6574 | + |
6575 | +/* 20 is max digits length of ulong 64 */ | |
6576 | +struct dbgaufs_arg { | |
6577 | + int n; | |
6578 | + char a[20 * 4]; | |
6579 | +}; | |
6580 | + | |
6581 | +/* | |
6582 | + * common function for all XINO files | |
6583 | + */ | |
6584 | +static int dbgaufs_xi_release(struct inode *inode __maybe_unused, | |
6585 | + struct file *file) | |
6586 | +{ | |
1c60b727 | 6587 | + kfree(file->private_data); |
1facf9fc | 6588 | + return 0; |
6589 | +} | |
6590 | + | |
062440b3 AM |
6591 | +static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt, |
6592 | + int cnt) | |
1facf9fc | 6593 | +{ |
6594 | + int err; | |
6595 | + struct kstat st; | |
6596 | + struct dbgaufs_arg *p; | |
6597 | + | |
6598 | + err = -ENOMEM; | |
6599 | + p = kmalloc(sizeof(*p), GFP_NOFS); | |
6600 | + if (unlikely(!p)) | |
6601 | + goto out; | |
6602 | + | |
6603 | + err = 0; | |
6604 | + p->n = 0; | |
6605 | + file->private_data = p; | |
6606 | + if (!xf) | |
6607 | + goto out; | |
6608 | + | |
521ced18 | 6609 | + err = vfsub_getattr(&xf->f_path, &st); |
1facf9fc | 6610 | + if (!err) { |
6611 | + if (do_fcnt) | |
6612 | + p->n = snprintf | |
062440b3 AM |
6613 | + (p->a, sizeof(p->a), "%d, %llux%u %lld\n", |
6614 | + cnt, st.blocks, st.blksize, | |
1facf9fc | 6615 | + (long long)st.size); |
6616 | + else | |
521ced18 | 6617 | + p->n = snprintf(p->a, sizeof(p->a), "%llux%u %lld\n", |
1facf9fc | 6618 | + st.blocks, st.blksize, |
6619 | + (long long)st.size); | |
6620 | + AuDebugOn(p->n >= sizeof(p->a)); | |
6621 | + } else { | |
6622 | + p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err); | |
6623 | + err = 0; | |
6624 | + } | |
6625 | + | |
4f0767ce | 6626 | +out: |
1facf9fc | 6627 | + return err; |
6628 | + | |
6629 | +} | |
6630 | + | |
6631 | +static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf, | |
6632 | + size_t count, loff_t *ppos) | |
6633 | +{ | |
6634 | + struct dbgaufs_arg *p; | |
6635 | + | |
6636 | + p = file->private_data; | |
6637 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
6638 | +} | |
6639 | + | |
6640 | +/* ---------------------------------------------------------------------- */ | |
6641 | + | |
86dc4139 AM |
6642 | +struct dbgaufs_plink_arg { |
6643 | + int n; | |
6644 | + char a[]; | |
6645 | +}; | |
6646 | + | |
6647 | +static int dbgaufs_plink_release(struct inode *inode __maybe_unused, | |
6648 | + struct file *file) | |
6649 | +{ | |
1c60b727 | 6650 | + free_page((unsigned long)file->private_data); |
86dc4139 AM |
6651 | + return 0; |
6652 | +} | |
6653 | + | |
6654 | +static int dbgaufs_plink_open(struct inode *inode, struct file *file) | |
6655 | +{ | |
6656 | + int err, i, limit; | |
6657 | + unsigned long n, sum; | |
6658 | + struct dbgaufs_plink_arg *p; | |
6659 | + struct au_sbinfo *sbinfo; | |
6660 | + struct super_block *sb; | |
8b6a4947 | 6661 | + struct hlist_bl_head *hbl; |
86dc4139 AM |
6662 | + |
6663 | + err = -ENOMEM; | |
6664 | + p = (void *)get_zeroed_page(GFP_NOFS); | |
6665 | + if (unlikely(!p)) | |
6666 | + goto out; | |
6667 | + | |
6668 | + err = -EFBIG; | |
6669 | + sbinfo = inode->i_private; | |
6670 | + sb = sbinfo->si_sb; | |
6671 | + si_noflush_read_lock(sb); | |
6672 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
6673 | + limit = PAGE_SIZE - sizeof(p->n); | |
6674 | + | |
6675 | + /* the number of buckets */ | |
6676 | + n = snprintf(p->a + p->n, limit, "%d\n", AuPlink_NHASH); | |
6677 | + p->n += n; | |
6678 | + limit -= n; | |
6679 | + | |
6680 | + sum = 0; | |
8b6a4947 AM |
6681 | + for (i = 0, hbl = sbinfo->si_plink; i < AuPlink_NHASH; |
6682 | + i++, hbl++) { | |
6683 | + n = au_hbl_count(hbl); | |
86dc4139 AM |
6684 | + sum += n; |
6685 | + | |
6686 | + n = snprintf(p->a + p->n, limit, "%lu ", n); | |
6687 | + p->n += n; | |
6688 | + limit -= n; | |
6689 | + if (unlikely(limit <= 0)) | |
6690 | + goto out_free; | |
6691 | + } | |
6692 | + p->a[p->n - 1] = '\n'; | |
6693 | + | |
6694 | + /* the sum of plinks */ | |
6695 | + n = snprintf(p->a + p->n, limit, "%lu\n", sum); | |
6696 | + p->n += n; | |
6697 | + limit -= n; | |
6698 | + if (unlikely(limit <= 0)) | |
6699 | + goto out_free; | |
6700 | + } else { | |
6701 | +#define str "1\n0\n0\n" | |
6702 | + p->n = sizeof(str) - 1; | |
6703 | + strcpy(p->a, str); | |
6704 | +#undef str | |
6705 | + } | |
6706 | + si_read_unlock(sb); | |
6707 | + | |
6708 | + err = 0; | |
6709 | + file->private_data = p; | |
6710 | + goto out; /* success */ | |
6711 | + | |
6712 | +out_free: | |
1c60b727 | 6713 | + free_page((unsigned long)p); |
86dc4139 AM |
6714 | +out: |
6715 | + return err; | |
6716 | +} | |
6717 | + | |
6718 | +static ssize_t dbgaufs_plink_read(struct file *file, char __user *buf, | |
6719 | + size_t count, loff_t *ppos) | |
6720 | +{ | |
6721 | + struct dbgaufs_plink_arg *p; | |
6722 | + | |
6723 | + p = file->private_data; | |
6724 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
6725 | +} | |
6726 | + | |
6727 | +static const struct file_operations dbgaufs_plink_fop = { | |
6728 | + .owner = THIS_MODULE, | |
6729 | + .open = dbgaufs_plink_open, | |
6730 | + .release = dbgaufs_plink_release, | |
6731 | + .read = dbgaufs_plink_read | |
6732 | +}; | |
6733 | + | |
6734 | +/* ---------------------------------------------------------------------- */ | |
6735 | + | |
1facf9fc | 6736 | +static int dbgaufs_xib_open(struct inode *inode, struct file *file) |
6737 | +{ | |
6738 | + int err; | |
6739 | + struct au_sbinfo *sbinfo; | |
6740 | + struct super_block *sb; | |
6741 | + | |
6742 | + sbinfo = inode->i_private; | |
6743 | + sb = sbinfo->si_sb; | |
6744 | + si_noflush_read_lock(sb); | |
062440b3 | 6745 | + err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0, /*cnt*/0); |
1facf9fc | 6746 | + si_read_unlock(sb); |
6747 | + return err; | |
6748 | +} | |
6749 | + | |
6750 | +static const struct file_operations dbgaufs_xib_fop = { | |
4a4d8108 | 6751 | + .owner = THIS_MODULE, |
1facf9fc | 6752 | + .open = dbgaufs_xib_open, |
6753 | + .release = dbgaufs_xi_release, | |
6754 | + .read = dbgaufs_xi_read | |
6755 | +}; | |
6756 | + | |
6757 | +/* ---------------------------------------------------------------------- */ | |
6758 | + | |
6759 | +#define DbgaufsXi_PREFIX "xi" | |
6760 | + | |
6761 | +static int dbgaufs_xino_open(struct inode *inode, struct file *file) | |
6762 | +{ | |
6763 | + int err; | |
6764 | + long l; | |
6765 | + struct au_sbinfo *sbinfo; | |
6766 | + struct super_block *sb; | |
6767 | + struct file *xf; | |
6768 | + struct qstr *name; | |
062440b3 | 6769 | + struct au_branch *br; |
1facf9fc | 6770 | + |
6771 | + err = -ENOENT; | |
6772 | + xf = NULL; | |
2000de60 | 6773 | + name = &file->f_path.dentry->d_name; |
1facf9fc | 6774 | + if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX) |
6775 | + || memcmp(name->name, DbgaufsXi_PREFIX, | |
6776 | + sizeof(DbgaufsXi_PREFIX) - 1))) | |
6777 | + goto out; | |
9dbd164d | 6778 | + err = kstrtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l); |
1facf9fc | 6779 | + if (unlikely(err)) |
6780 | + goto out; | |
6781 | + | |
6782 | + sbinfo = inode->i_private; | |
6783 | + sb = sbinfo->si_sb; | |
6784 | + si_noflush_read_lock(sb); | |
5afbbe0d | 6785 | + if (l <= au_sbbot(sb)) { |
062440b3 AM |
6786 | + br = au_sbr(sb, (aufs_bindex_t)l); |
6787 | + xf = au_xino_file(br); | |
6788 | + err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1, | |
6789 | + au_xino_count(br)); | |
1facf9fc | 6790 | + } else |
6791 | + err = -ENOENT; | |
6792 | + si_read_unlock(sb); | |
6793 | + | |
4f0767ce | 6794 | +out: |
1facf9fc | 6795 | + return err; |
6796 | +} | |
6797 | + | |
6798 | +static const struct file_operations dbgaufs_xino_fop = { | |
4a4d8108 | 6799 | + .owner = THIS_MODULE, |
1facf9fc | 6800 | + .open = dbgaufs_xino_open, |
6801 | + .release = dbgaufs_xi_release, | |
6802 | + .read = dbgaufs_xi_read | |
6803 | +}; | |
6804 | + | |
062440b3 AM |
6805 | +void dbgaufs_xino_del(struct au_branch *br) |
6806 | +{ | |
6807 | + struct dentry *dbgaufs; | |
6808 | + | |
6809 | + dbgaufs = br->br_dbgaufs; | |
6810 | + if (!dbgaufs) | |
6811 | + return; | |
6812 | + | |
6813 | + br->br_dbgaufs = NULL; | |
6814 | + /* debugfs acquires the parent i_mutex */ | |
6815 | + lockdep_off(); | |
6816 | + debugfs_remove(dbgaufs); | |
6817 | + lockdep_on(); | |
6818 | +} | |
6819 | + | |
1facf9fc | 6820 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) |
6821 | +{ | |
5afbbe0d | 6822 | + aufs_bindex_t bbot; |
1facf9fc | 6823 | + struct au_branch *br; |
1facf9fc | 6824 | + |
6825 | + if (!au_sbi(sb)->si_dbgaufs) | |
6826 | + return; | |
6827 | + | |
5afbbe0d AM |
6828 | + bbot = au_sbbot(sb); |
6829 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 6830 | + br = au_sbr(sb, bindex); |
062440b3 AM |
6831 | + dbgaufs_xino_del(br); |
6832 | + } | |
6833 | +} | |
6834 | + | |
6835 | +static void dbgaufs_br_add(struct super_block *sb, aufs_bindex_t bindex, | |
6836 | + struct dentry *parent, struct au_sbinfo *sbinfo) | |
6837 | +{ | |
6838 | + struct au_branch *br; | |
6839 | + struct dentry *d; | |
6840 | + char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */ | |
6841 | + | |
6842 | + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex); | |
6843 | + br = au_sbr(sb, bindex); | |
6844 | + if (br->br_dbgaufs) { | |
6845 | + struct qstr qstr = QSTR_INIT(name, strlen(name)); | |
6846 | + | |
6847 | + if (!au_qstreq(&br->br_dbgaufs->d_name, &qstr)) { | |
6848 | + /* debugfs acquires the parent i_mutex */ | |
6849 | + lockdep_off(); | |
6850 | + d = debugfs_rename(parent, br->br_dbgaufs, parent, | |
6851 | + name); | |
6852 | + lockdep_on(); | |
6853 | + if (unlikely(!d)) | |
6854 | + pr_warn("failed renaming %pd/%s, ignored.\n", | |
6855 | + parent, name); | |
6856 | + } | |
6857 | + } else { | |
e2f27e51 | 6858 | + lockdep_off(); |
062440b3 AM |
6859 | + br->br_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent, |
6860 | + sbinfo, &dbgaufs_xino_fop); | |
e2f27e51 | 6861 | + lockdep_on(); |
062440b3 AM |
6862 | + if (unlikely(!br->br_dbgaufs)) |
6863 | + pr_warn("failed creaiting %pd/%s, ignored.\n", | |
6864 | + parent, name); | |
1facf9fc | 6865 | + } |
6866 | +} | |
6867 | + | |
062440b3 | 6868 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown) |
1facf9fc | 6869 | +{ |
6870 | + struct au_sbinfo *sbinfo; | |
6871 | + struct dentry *parent; | |
5afbbe0d | 6872 | + aufs_bindex_t bbot; |
062440b3 AM |
6873 | + |
6874 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
6875 | + return; | |
1facf9fc | 6876 | + |
6877 | + sbinfo = au_sbi(sb); | |
6878 | + parent = sbinfo->si_dbgaufs; | |
6879 | + if (!parent) | |
6880 | + return; | |
6881 | + | |
5afbbe0d | 6882 | + bbot = au_sbbot(sb); |
062440b3 AM |
6883 | + if (topdown) |
6884 | + for (; bindex <= bbot; bindex++) | |
6885 | + dbgaufs_br_add(sb, bindex, parent, sbinfo); | |
6886 | + else | |
6887 | + for (; bbot >= bindex; bbot--) | |
6888 | + dbgaufs_br_add(sb, bbot, parent, sbinfo); | |
1facf9fc | 6889 | +} |
6890 | + | |
6891 | +/* ---------------------------------------------------------------------- */ | |
6892 | + | |
6893 | +#ifdef CONFIG_AUFS_EXPORT | |
6894 | +static int dbgaufs_xigen_open(struct inode *inode, struct file *file) | |
6895 | +{ | |
6896 | + int err; | |
6897 | + struct au_sbinfo *sbinfo; | |
6898 | + struct super_block *sb; | |
6899 | + | |
6900 | + sbinfo = inode->i_private; | |
6901 | + sb = sbinfo->si_sb; | |
6902 | + si_noflush_read_lock(sb); | |
062440b3 | 6903 | + err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0, /*cnt*/0); |
1facf9fc | 6904 | + si_read_unlock(sb); |
6905 | + return err; | |
6906 | +} | |
6907 | + | |
6908 | +static const struct file_operations dbgaufs_xigen_fop = { | |
4a4d8108 | 6909 | + .owner = THIS_MODULE, |
1facf9fc | 6910 | + .open = dbgaufs_xigen_open, |
6911 | + .release = dbgaufs_xi_release, | |
6912 | + .read = dbgaufs_xi_read | |
6913 | +}; | |
6914 | + | |
6915 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
6916 | +{ | |
6917 | + int err; | |
6918 | + | |
dece6358 | 6919 | + /* |
c1595e42 | 6920 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
6921 | + * so the tiny check for si_rwsem is unnecessary. |
6922 | + */ | |
6923 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6924 | + | |
1facf9fc | 6925 | + err = -EIO; |
6926 | + sbinfo->si_dbgaufs_xigen = debugfs_create_file | |
6927 | + ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6928 | + &dbgaufs_xigen_fop); | |
6929 | + if (sbinfo->si_dbgaufs_xigen) | |
6930 | + err = 0; | |
6931 | + | |
6932 | + return err; | |
6933 | +} | |
6934 | +#else | |
6935 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
6936 | +{ | |
6937 | + return 0; | |
6938 | +} | |
6939 | +#endif /* CONFIG_AUFS_EXPORT */ | |
6940 | + | |
6941 | +/* ---------------------------------------------------------------------- */ | |
6942 | + | |
6943 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo) | |
6944 | +{ | |
dece6358 | 6945 | + /* |
7e9cd9fe | 6946 | + * This function is a dynamic '__fin' function actually, |
dece6358 AM |
6947 | + * so the tiny check for si_rwsem is unnecessary. |
6948 | + */ | |
6949 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6950 | + | |
1facf9fc | 6951 | + debugfs_remove_recursive(sbinfo->si_dbgaufs); |
6952 | + sbinfo->si_dbgaufs = NULL; | |
1facf9fc | 6953 | +} |
6954 | + | |
6955 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo) | |
6956 | +{ | |
6957 | + int err; | |
6958 | + char name[SysaufsSiNameLen]; | |
6959 | + | |
dece6358 | 6960 | + /* |
c1595e42 | 6961 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
6962 | + * so the tiny check for si_rwsem is unnecessary. |
6963 | + */ | |
6964 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
6965 | + | |
1facf9fc | 6966 | + err = -ENOENT; |
6967 | + if (!dbgaufs) { | |
6968 | + AuErr1("/debug/aufs is uninitialized\n"); | |
6969 | + goto out; | |
6970 | + } | |
6971 | + | |
6972 | + err = -EIO; | |
6973 | + sysaufs_name(sbinfo, name); | |
6974 | + sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs); | |
6975 | + if (unlikely(!sbinfo->si_dbgaufs)) | |
6976 | + goto out; | |
1facf9fc | 6977 | + |
062440b3 | 6978 | + /* regardless plink/noplink option */ |
86dc4139 AM |
6979 | + sbinfo->si_dbgaufs_plink = debugfs_create_file |
6980 | + ("plink", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6981 | + &dbgaufs_plink_fop); | |
6982 | + if (unlikely(!sbinfo->si_dbgaufs_plink)) | |
6983 | + goto out_dir; | |
6984 | + | |
062440b3 AM |
6985 | + /* regardless xino/noxino option */ |
6986 | + sbinfo->si_dbgaufs_xib = debugfs_create_file | |
6987 | + ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
6988 | + &dbgaufs_xib_fop); | |
6989 | + if (unlikely(!sbinfo->si_dbgaufs_xib)) | |
6990 | + goto out_dir; | |
6991 | + | |
1facf9fc | 6992 | + err = dbgaufs_xigen_init(sbinfo); |
6993 | + if (!err) | |
6994 | + goto out; /* success */ | |
6995 | + | |
4f0767ce | 6996 | +out_dir: |
1facf9fc | 6997 | + dbgaufs_si_fin(sbinfo); |
4f0767ce | 6998 | +out: |
062440b3 AM |
6999 | + if (unlikely(err)) |
7000 | + pr_err("debugfs/aufs failed\n"); | |
1facf9fc | 7001 | + return err; |
7002 | +} | |
7003 | + | |
7004 | +/* ---------------------------------------------------------------------- */ | |
7005 | + | |
7006 | +void dbgaufs_fin(void) | |
7007 | +{ | |
7008 | + debugfs_remove(dbgaufs); | |
7009 | +} | |
7010 | + | |
7011 | +int __init dbgaufs_init(void) | |
7012 | +{ | |
7013 | + int err; | |
7014 | + | |
7015 | + err = -EIO; | |
7016 | + dbgaufs = debugfs_create_dir(AUFS_NAME, NULL); | |
7017 | + if (dbgaufs) | |
7018 | + err = 0; | |
7019 | + return err; | |
7020 | +} | |
7f207e10 AM |
7021 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.h linux/fs/aufs/dbgaufs.h |
7022 | --- /usr/share/empty/fs/aufs/dbgaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 7023 | +++ linux/fs/aufs/dbgaufs.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
7024 | @@ -0,0 +1,53 @@ |
7025 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 7026 | +/* |
b00004a5 | 7027 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 7028 | + * |
7029 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7030 | + * it under the terms of the GNU General Public License as published by | |
7031 | + * the Free Software Foundation; either version 2 of the License, or | |
7032 | + * (at your option) any later version. | |
dece6358 AM |
7033 | + * |
7034 | + * This program is distributed in the hope that it will be useful, | |
7035 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7036 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7037 | + * GNU General Public License for more details. | |
7038 | + * | |
7039 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7040 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7041 | + */ |
7042 | + | |
7043 | +/* | |
7044 | + * debugfs interface | |
7045 | + */ | |
7046 | + | |
7047 | +#ifndef __DBGAUFS_H__ | |
7048 | +#define __DBGAUFS_H__ | |
7049 | + | |
7050 | +#ifdef __KERNEL__ | |
7051 | + | |
dece6358 | 7052 | +struct super_block; |
1facf9fc | 7053 | +struct au_sbinfo; |
062440b3 | 7054 | +struct au_branch; |
dece6358 | 7055 | + |
1facf9fc | 7056 | +#ifdef CONFIG_DEBUG_FS |
7057 | +/* dbgaufs.c */ | |
062440b3 | 7058 | +void dbgaufs_xino_del(struct au_branch *br); |
1facf9fc | 7059 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); |
062440b3 | 7060 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex, int topdown); |
1facf9fc | 7061 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo); |
7062 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo); | |
7063 | +void dbgaufs_fin(void); | |
7064 | +int __init dbgaufs_init(void); | |
1facf9fc | 7065 | +#else |
062440b3 | 7066 | +AuStubVoid(dbgaufs_xino_del, struct au_branch *br) |
4a4d8108 | 7067 | +AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) |
062440b3 AM |
7068 | +AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex, |
7069 | + int topdown) | |
4a4d8108 AM |
7070 | +AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo) |
7071 | +AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo) | |
7072 | +AuStubVoid(dbgaufs_fin, void) | |
7073 | +AuStubInt0(__init dbgaufs_init, void) | |
1facf9fc | 7074 | +#endif /* CONFIG_DEBUG_FS */ |
7075 | + | |
7076 | +#endif /* __KERNEL__ */ | |
7077 | +#endif /* __DBGAUFS_H__ */ | |
7f207e10 AM |
7078 | diff -urN /usr/share/empty/fs/aufs/dcsub.c linux/fs/aufs/dcsub.c |
7079 | --- /usr/share/empty/fs/aufs/dcsub.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 AM |
7080 | +++ linux/fs/aufs/dcsub.c 2018-08-12 23:43:05.453457863 +0200 |
7081 | @@ -0,0 +1,225 @@ | |
7082 | +// SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 7083 | +/* |
b00004a5 | 7084 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 7085 | + * |
7086 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7087 | + * it under the terms of the GNU General Public License as published by | |
7088 | + * the Free Software Foundation; either version 2 of the License, or | |
7089 | + * (at your option) any later version. | |
dece6358 AM |
7090 | + * |
7091 | + * This program is distributed in the hope that it will be useful, | |
7092 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7093 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7094 | + * GNU General Public License for more details. | |
7095 | + * | |
7096 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7097 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7098 | + */ |
7099 | + | |
7100 | +/* | |
7101 | + * sub-routines for dentry cache | |
7102 | + */ | |
7103 | + | |
7104 | +#include "aufs.h" | |
7105 | + | |
7106 | +static void au_dpage_free(struct au_dpage *dpage) | |
7107 | +{ | |
7108 | + int i; | |
7109 | + struct dentry **p; | |
7110 | + | |
7111 | + p = dpage->dentries; | |
7112 | + for (i = 0; i < dpage->ndentry; i++) | |
7113 | + dput(*p++); | |
1c60b727 | 7114 | + free_page((unsigned long)dpage->dentries); |
1facf9fc | 7115 | +} |
7116 | + | |
7117 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp) | |
7118 | +{ | |
7119 | + int err; | |
7120 | + void *p; | |
7121 | + | |
7122 | + err = -ENOMEM; | |
7123 | + dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp); | |
7124 | + if (unlikely(!dpages->dpages)) | |
7125 | + goto out; | |
7126 | + | |
7127 | + p = (void *)__get_free_page(gfp); | |
7128 | + if (unlikely(!p)) | |
7129 | + goto out_dpages; | |
7130 | + | |
7131 | + dpages->dpages[0].ndentry = 0; | |
7132 | + dpages->dpages[0].dentries = p; | |
7133 | + dpages->ndpage = 1; | |
7134 | + return 0; /* success */ | |
7135 | + | |
4f0767ce | 7136 | +out_dpages: |
1c60b727 | 7137 | + kfree(dpages->dpages); |
4f0767ce | 7138 | +out: |
1facf9fc | 7139 | + return err; |
7140 | +} | |
7141 | + | |
7142 | +void au_dpages_free(struct au_dcsub_pages *dpages) | |
7143 | +{ | |
7144 | + int i; | |
7145 | + struct au_dpage *p; | |
7146 | + | |
7147 | + p = dpages->dpages; | |
7148 | + for (i = 0; i < dpages->ndpage; i++) | |
7149 | + au_dpage_free(p++); | |
1c60b727 | 7150 | + kfree(dpages->dpages); |
1facf9fc | 7151 | +} |
7152 | + | |
7153 | +static int au_dpages_append(struct au_dcsub_pages *dpages, | |
7154 | + struct dentry *dentry, gfp_t gfp) | |
7155 | +{ | |
7156 | + int err, sz; | |
7157 | + struct au_dpage *dpage; | |
7158 | + void *p; | |
7159 | + | |
7160 | + dpage = dpages->dpages + dpages->ndpage - 1; | |
7161 | + sz = PAGE_SIZE / sizeof(dentry); | |
7162 | + if (unlikely(dpage->ndentry >= sz)) { | |
7163 | + AuLabel(new dpage); | |
7164 | + err = -ENOMEM; | |
7165 | + sz = dpages->ndpage * sizeof(*dpages->dpages); | |
7166 | + p = au_kzrealloc(dpages->dpages, sz, | |
e2f27e51 AM |
7167 | + sz + sizeof(*dpages->dpages), gfp, |
7168 | + /*may_shrink*/0); | |
1facf9fc | 7169 | + if (unlikely(!p)) |
7170 | + goto out; | |
7171 | + | |
7172 | + dpages->dpages = p; | |
7173 | + dpage = dpages->dpages + dpages->ndpage; | |
7174 | + p = (void *)__get_free_page(gfp); | |
7175 | + if (unlikely(!p)) | |
7176 | + goto out; | |
7177 | + | |
7178 | + dpage->ndentry = 0; | |
7179 | + dpage->dentries = p; | |
7180 | + dpages->ndpage++; | |
7181 | + } | |
7182 | + | |
c1595e42 | 7183 | + AuDebugOn(au_dcount(dentry) <= 0); |
027c5e7a | 7184 | + dpage->dentries[dpage->ndentry++] = dget_dlock(dentry); |
1facf9fc | 7185 | + return 0; /* success */ |
7186 | + | |
4f0767ce | 7187 | +out: |
1facf9fc | 7188 | + return err; |
7189 | +} | |
7190 | + | |
c1595e42 JR |
7191 | +/* todo: BAD approach */ |
7192 | +/* copied from linux/fs/dcache.c */ | |
7193 | +enum d_walk_ret { | |
7194 | + D_WALK_CONTINUE, | |
7195 | + D_WALK_QUIT, | |
7196 | + D_WALK_NORETRY, | |
7197 | + D_WALK_SKIP, | |
7198 | +}; | |
7199 | + | |
7200 | +extern void d_walk(struct dentry *parent, void *data, | |
cd7a4cd9 | 7201 | + enum d_walk_ret (*enter)(void *, struct dentry *)); |
c1595e42 JR |
7202 | + |
7203 | +struct ac_dpages_arg { | |
1facf9fc | 7204 | + int err; |
c1595e42 JR |
7205 | + struct au_dcsub_pages *dpages; |
7206 | + struct super_block *sb; | |
7207 | + au_dpages_test test; | |
7208 | + void *arg; | |
7209 | +}; | |
1facf9fc | 7210 | + |
c1595e42 JR |
7211 | +static enum d_walk_ret au_call_dpages_append(void *_arg, struct dentry *dentry) |
7212 | +{ | |
7213 | + enum d_walk_ret ret; | |
7214 | + struct ac_dpages_arg *arg = _arg; | |
1facf9fc | 7215 | + |
c1595e42 JR |
7216 | + ret = D_WALK_CONTINUE; |
7217 | + if (dentry->d_sb == arg->sb | |
7218 | + && !IS_ROOT(dentry) | |
7219 | + && au_dcount(dentry) > 0 | |
7220 | + && au_di(dentry) | |
7221 | + && (!arg->test || arg->test(dentry, arg->arg))) { | |
7222 | + arg->err = au_dpages_append(arg->dpages, dentry, GFP_ATOMIC); | |
7223 | + if (unlikely(arg->err)) | |
7224 | + ret = D_WALK_QUIT; | |
1facf9fc | 7225 | + } |
7226 | + | |
c1595e42 JR |
7227 | + return ret; |
7228 | +} | |
027c5e7a | 7229 | + |
c1595e42 JR |
7230 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, |
7231 | + au_dpages_test test, void *arg) | |
7232 | +{ | |
7233 | + struct ac_dpages_arg args = { | |
7234 | + .err = 0, | |
7235 | + .dpages = dpages, | |
7236 | + .sb = root->d_sb, | |
7237 | + .test = test, | |
7238 | + .arg = arg | |
7239 | + }; | |
027c5e7a | 7240 | + |
cd7a4cd9 | 7241 | + d_walk(root, &args, au_call_dpages_append); |
c1595e42 JR |
7242 | + |
7243 | + return args.err; | |
1facf9fc | 7244 | +} |
7245 | + | |
7246 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
7247 | + int do_include, au_dpages_test test, void *arg) | |
7248 | +{ | |
7249 | + int err; | |
7250 | + | |
7251 | + err = 0; | |
027c5e7a AM |
7252 | + write_seqlock(&rename_lock); |
7253 | + spin_lock(&dentry->d_lock); | |
7254 | + if (do_include | |
c1595e42 | 7255 | + && au_dcount(dentry) > 0 |
027c5e7a | 7256 | + && (!test || test(dentry, arg))) |
1facf9fc | 7257 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
7258 | + spin_unlock(&dentry->d_lock); |
7259 | + if (unlikely(err)) | |
7260 | + goto out; | |
7261 | + | |
7262 | + /* | |
523b37e3 | 7263 | + * RCU for vfsmount is unnecessary since this is a traverse in a single |
027c5e7a AM |
7264 | + * mount |
7265 | + */ | |
1facf9fc | 7266 | + while (!IS_ROOT(dentry)) { |
027c5e7a AM |
7267 | + dentry = dentry->d_parent; /* rename_lock is locked */ |
7268 | + spin_lock(&dentry->d_lock); | |
c1595e42 | 7269 | + if (au_dcount(dentry) > 0 |
027c5e7a | 7270 | + && (!test || test(dentry, arg))) |
1facf9fc | 7271 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
7272 | + spin_unlock(&dentry->d_lock); |
7273 | + if (unlikely(err)) | |
7274 | + break; | |
1facf9fc | 7275 | + } |
7276 | + | |
4f0767ce | 7277 | +out: |
027c5e7a | 7278 | + write_sequnlock(&rename_lock); |
1facf9fc | 7279 | + return err; |
7280 | +} | |
7281 | + | |
027c5e7a AM |
7282 | +static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg) |
7283 | +{ | |
7284 | + return au_di(dentry) && dentry->d_sb == arg; | |
7285 | +} | |
7286 | + | |
7287 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, | |
7288 | + struct dentry *dentry, int do_include) | |
7289 | +{ | |
7290 | + return au_dcsub_pages_rev(dpages, dentry, do_include, | |
7291 | + au_dcsub_dpages_aufs, dentry->d_sb); | |
7292 | +} | |
7293 | + | |
4a4d8108 | 7294 | +int au_test_subdir(struct dentry *d1, struct dentry *d2) |
1facf9fc | 7295 | +{ |
4a4d8108 AM |
7296 | + struct path path[2] = { |
7297 | + { | |
7298 | + .dentry = d1 | |
7299 | + }, | |
7300 | + { | |
7301 | + .dentry = d2 | |
7302 | + } | |
7303 | + }; | |
1facf9fc | 7304 | + |
4a4d8108 | 7305 | + return path_is_under(path + 0, path + 1); |
1facf9fc | 7306 | +} |
7f207e10 AM |
7307 | diff -urN /usr/share/empty/fs/aufs/dcsub.h linux/fs/aufs/dcsub.h |
7308 | --- /usr/share/empty/fs/aufs/dcsub.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 7309 | +++ linux/fs/aufs/dcsub.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
7310 | @@ -0,0 +1,137 @@ |
7311 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 7312 | +/* |
b00004a5 | 7313 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 7314 | + * |
7315 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7316 | + * it under the terms of the GNU General Public License as published by | |
7317 | + * the Free Software Foundation; either version 2 of the License, or | |
7318 | + * (at your option) any later version. | |
dece6358 AM |
7319 | + * |
7320 | + * This program is distributed in the hope that it will be useful, | |
7321 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7322 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7323 | + * GNU General Public License for more details. | |
7324 | + * | |
7325 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7326 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7327 | + */ |
7328 | + | |
7329 | +/* | |
7330 | + * sub-routines for dentry cache | |
7331 | + */ | |
7332 | + | |
7333 | +#ifndef __AUFS_DCSUB_H__ | |
7334 | +#define __AUFS_DCSUB_H__ | |
7335 | + | |
7336 | +#ifdef __KERNEL__ | |
7337 | + | |
7f207e10 | 7338 | +#include <linux/dcache.h> |
027c5e7a | 7339 | +#include <linux/fs.h> |
dece6358 | 7340 | + |
1facf9fc | 7341 | +struct au_dpage { |
7342 | + int ndentry; | |
7343 | + struct dentry **dentries; | |
7344 | +}; | |
7345 | + | |
7346 | +struct au_dcsub_pages { | |
7347 | + int ndpage; | |
7348 | + struct au_dpage *dpages; | |
7349 | +}; | |
7350 | + | |
7351 | +/* ---------------------------------------------------------------------- */ | |
7352 | + | |
7f207e10 | 7353 | +/* dcsub.c */ |
1facf9fc | 7354 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); |
7355 | +void au_dpages_free(struct au_dcsub_pages *dpages); | |
7356 | +typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); | |
7357 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
7358 | + au_dpages_test test, void *arg); | |
7359 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
7360 | + int do_include, au_dpages_test test, void *arg); | |
027c5e7a AM |
7361 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, |
7362 | + struct dentry *dentry, int do_include); | |
4a4d8108 | 7363 | +int au_test_subdir(struct dentry *d1, struct dentry *d2); |
1facf9fc | 7364 | + |
7f207e10 AM |
7365 | +/* ---------------------------------------------------------------------- */ |
7366 | + | |
523b37e3 AM |
7367 | +/* |
7368 | + * todo: in linux-3.13, several similar (but faster) helpers are added to | |
7369 | + * include/linux/dcache.h. Try them (in the future). | |
7370 | + */ | |
7371 | + | |
027c5e7a AM |
7372 | +static inline int au_d_hashed_positive(struct dentry *d) |
7373 | +{ | |
7374 | + int err; | |
5527c038 | 7375 | + struct inode *inode = d_inode(d); |
076b876e | 7376 | + |
027c5e7a | 7377 | + err = 0; |
5527c038 JR |
7378 | + if (unlikely(d_unhashed(d) |
7379 | + || d_is_negative(d) | |
7380 | + || !inode->i_nlink)) | |
027c5e7a AM |
7381 | + err = -ENOENT; |
7382 | + return err; | |
7383 | +} | |
7384 | + | |
38d290e6 JR |
7385 | +static inline int au_d_linkable(struct dentry *d) |
7386 | +{ | |
7387 | + int err; | |
5527c038 | 7388 | + struct inode *inode = d_inode(d); |
076b876e | 7389 | + |
38d290e6 JR |
7390 | + err = au_d_hashed_positive(d); |
7391 | + if (err | |
5527c038 | 7392 | + && d_is_positive(d) |
38d290e6 JR |
7393 | + && (inode->i_state & I_LINKABLE)) |
7394 | + err = 0; | |
7395 | + return err; | |
7396 | +} | |
7397 | + | |
027c5e7a AM |
7398 | +static inline int au_d_alive(struct dentry *d) |
7399 | +{ | |
7400 | + int err; | |
7401 | + struct inode *inode; | |
076b876e | 7402 | + |
027c5e7a AM |
7403 | + err = 0; |
7404 | + if (!IS_ROOT(d)) | |
7405 | + err = au_d_hashed_positive(d); | |
7406 | + else { | |
5527c038 JR |
7407 | + inode = d_inode(d); |
7408 | + if (unlikely(d_unlinked(d) | |
7409 | + || d_is_negative(d) | |
7410 | + || !inode->i_nlink)) | |
027c5e7a AM |
7411 | + err = -ENOENT; |
7412 | + } | |
7413 | + return err; | |
7414 | +} | |
7415 | + | |
7416 | +static inline int au_alive_dir(struct dentry *d) | |
7f207e10 | 7417 | +{ |
027c5e7a | 7418 | + int err; |
076b876e | 7419 | + |
027c5e7a | 7420 | + err = au_d_alive(d); |
5527c038 | 7421 | + if (unlikely(err || IS_DEADDIR(d_inode(d)))) |
027c5e7a AM |
7422 | + err = -ENOENT; |
7423 | + return err; | |
7f207e10 AM |
7424 | +} |
7425 | + | |
38d290e6 JR |
7426 | +static inline int au_qstreq(struct qstr *a, struct qstr *b) |
7427 | +{ | |
7428 | + return a->len == b->len | |
7429 | + && !memcmp(a->name, b->name, a->len); | |
7430 | +} | |
7431 | + | |
7e9cd9fe AM |
7432 | +/* |
7433 | + * by the commit | |
7434 | + * 360f547 2015-01-25 dcache: let the dentry count go down to zero without | |
7435 | + * taking d_lock | |
7436 | + * the type of d_lockref.count became int, but the inlined function d_count() | |
7437 | + * still returns unsigned int. | |
7438 | + * I don't know why. Maybe it is for every d_count() users? | |
7439 | + * Anyway au_dcount() lives on. | |
7440 | + */ | |
c1595e42 JR |
7441 | +static inline int au_dcount(struct dentry *d) |
7442 | +{ | |
7443 | + return (int)d_count(d); | |
7444 | +} | |
7445 | + | |
1facf9fc | 7446 | +#endif /* __KERNEL__ */ |
7447 | +#endif /* __AUFS_DCSUB_H__ */ | |
7f207e10 AM |
7448 | diff -urN /usr/share/empty/fs/aufs/debug.c linux/fs/aufs/debug.c |
7449 | --- /usr/share/empty/fs/aufs/debug.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 7450 | +++ linux/fs/aufs/debug.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 7451 | @@ -0,0 +1,441 @@ |
cd7a4cd9 | 7452 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 7453 | +/* |
b00004a5 | 7454 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 7455 | + * |
7456 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7457 | + * it under the terms of the GNU General Public License as published by | |
7458 | + * the Free Software Foundation; either version 2 of the License, or | |
7459 | + * (at your option) any later version. | |
dece6358 AM |
7460 | + * |
7461 | + * This program is distributed in the hope that it will be useful, | |
7462 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7463 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7464 | + * GNU General Public License for more details. | |
7465 | + * | |
7466 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7467 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7468 | + */ |
7469 | + | |
7470 | +/* | |
7471 | + * debug print functions | |
7472 | + */ | |
7473 | + | |
7474 | +#include "aufs.h" | |
7475 | + | |
392086de AM |
7476 | +/* Returns 0, or -errno. arg is in kp->arg. */ |
7477 | +static int param_atomic_t_set(const char *val, const struct kernel_param *kp) | |
7478 | +{ | |
7479 | + int err, n; | |
7480 | + | |
7481 | + err = kstrtoint(val, 0, &n); | |
7482 | + if (!err) { | |
7483 | + if (n > 0) | |
7484 | + au_debug_on(); | |
7485 | + else | |
7486 | + au_debug_off(); | |
7487 | + } | |
7488 | + return err; | |
7489 | +} | |
7490 | + | |
7491 | +/* Returns length written or -errno. Buffer is 4k (ie. be short!) */ | |
7492 | +static int param_atomic_t_get(char *buffer, const struct kernel_param *kp) | |
7493 | +{ | |
7494 | + atomic_t *a; | |
7495 | + | |
7496 | + a = kp->arg; | |
7497 | + return sprintf(buffer, "%d", atomic_read(a)); | |
7498 | +} | |
7499 | + | |
7500 | +static struct kernel_param_ops param_ops_atomic_t = { | |
7501 | + .set = param_atomic_t_set, | |
7502 | + .get = param_atomic_t_get | |
7503 | + /* void (*free)(void *arg) */ | |
7504 | +}; | |
7505 | + | |
7506 | +atomic_t aufs_debug = ATOMIC_INIT(0); | |
1facf9fc | 7507 | +MODULE_PARM_DESC(debug, "debug print"); |
cd7a4cd9 | 7508 | +module_param_named(debug, aufs_debug, atomic_t, 0664); |
1facf9fc | 7509 | + |
c1595e42 | 7510 | +DEFINE_MUTEX(au_dbg_mtx); /* just to serialize the dbg msgs */ |
1facf9fc | 7511 | +char *au_plevel = KERN_DEBUG; |
e49829fe JR |
7512 | +#define dpri(fmt, ...) do { \ |
7513 | + if ((au_plevel \ | |
7514 | + && strcmp(au_plevel, KERN_DEBUG)) \ | |
7515 | + || au_debug_test()) \ | |
7516 | + printk("%s" fmt, au_plevel, ##__VA_ARGS__); \ | |
1facf9fc | 7517 | +} while (0) |
7518 | + | |
7519 | +/* ---------------------------------------------------------------------- */ | |
7520 | + | |
7521 | +void au_dpri_whlist(struct au_nhash *whlist) | |
7522 | +{ | |
7523 | + unsigned long ul, n; | |
7524 | + struct hlist_head *head; | |
c06a8ce3 | 7525 | + struct au_vdir_wh *pos; |
1facf9fc | 7526 | + |
7527 | + n = whlist->nh_num; | |
7528 | + head = whlist->nh_head; | |
7529 | + for (ul = 0; ul < n; ul++) { | |
c06a8ce3 | 7530 | + hlist_for_each_entry(pos, head, wh_hash) |
1facf9fc | 7531 | + dpri("b%d, %.*s, %d\n", |
c06a8ce3 AM |
7532 | + pos->wh_bindex, |
7533 | + pos->wh_str.len, pos->wh_str.name, | |
7534 | + pos->wh_str.len); | |
1facf9fc | 7535 | + head++; |
7536 | + } | |
7537 | +} | |
7538 | + | |
7539 | +void au_dpri_vdir(struct au_vdir *vdir) | |
7540 | +{ | |
7541 | + unsigned long ul; | |
7542 | + union au_vdir_deblk_p p; | |
7543 | + unsigned char *o; | |
7544 | + | |
7545 | + if (!vdir || IS_ERR(vdir)) { | |
7546 | + dpri("err %ld\n", PTR_ERR(vdir)); | |
7547 | + return; | |
7548 | + } | |
7549 | + | |
be118d29 | 7550 | + dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %llu\n", |
1facf9fc | 7551 | + vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk, |
7552 | + vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version); | |
7553 | + for (ul = 0; ul < vdir->vd_nblk; ul++) { | |
7554 | + p.deblk = vdir->vd_deblk[ul]; | |
7555 | + o = p.deblk; | |
7556 | + dpri("[%lu]: %p\n", ul, o); | |
7557 | + } | |
7558 | +} | |
7559 | + | |
53392da6 | 7560 | +static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn, |
1facf9fc | 7561 | + struct dentry *wh) |
7562 | +{ | |
7563 | + char *n = NULL; | |
7564 | + int l = 0; | |
7565 | + | |
7566 | + if (!inode || IS_ERR(inode)) { | |
7567 | + dpri("i%d: err %ld\n", bindex, PTR_ERR(inode)); | |
7568 | + return -1; | |
7569 | + } | |
7570 | + | |
c2b27bf2 | 7571 | + /* the type of i_blocks depends upon CONFIG_LBDAF */ |
1facf9fc | 7572 | + BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long) |
7573 | + && sizeof(inode->i_blocks) != sizeof(u64)); | |
7574 | + if (wh) { | |
7575 | + n = (void *)wh->d_name.name; | |
7576 | + l = wh->d_name.len; | |
7577 | + } | |
7578 | + | |
53392da6 AM |
7579 | + dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu," |
7580 | + " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n", | |
7581 | + bindex, inode, | |
1facf9fc | 7582 | + inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??", |
7583 | + atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode, | |
7584 | + i_size_read(inode), (unsigned long long)inode->i_blocks, | |
cd7a4cd9 | 7585 | + hn, (long long)timespec64_to_ns(&inode->i_ctime) & 0x0ffff, |
1facf9fc | 7586 | + inode->i_mapping ? inode->i_mapping->nrpages : 0, |
be118d29 | 7587 | + inode->i_state, inode->i_flags, inode_peek_iversion(inode), |
b752ccd1 | 7588 | + inode->i_generation, |
1facf9fc | 7589 | + l ? ", wh " : "", l, n); |
7590 | + return 0; | |
7591 | +} | |
7592 | + | |
7593 | +void au_dpri_inode(struct inode *inode) | |
7594 | +{ | |
7595 | + struct au_iinfo *iinfo; | |
5afbbe0d | 7596 | + struct au_hinode *hi; |
1facf9fc | 7597 | + aufs_bindex_t bindex; |
53392da6 | 7598 | + int err, hn; |
1facf9fc | 7599 | + |
53392da6 | 7600 | + err = do_pri_inode(-1, inode, -1, NULL); |
5afbbe0d | 7601 | + if (err || !au_test_aufs(inode->i_sb) || au_is_bad_inode(inode)) |
1facf9fc | 7602 | + return; |
7603 | + | |
7604 | + iinfo = au_ii(inode); | |
5afbbe0d AM |
7605 | + dpri("i-1: btop %d, bbot %d, gen %d\n", |
7606 | + iinfo->ii_btop, iinfo->ii_bbot, au_iigen(inode, NULL)); | |
7607 | + if (iinfo->ii_btop < 0) | |
1facf9fc | 7608 | + return; |
53392da6 | 7609 | + hn = 0; |
5afbbe0d AM |
7610 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; bindex++) { |
7611 | + hi = au_hinode(iinfo, bindex); | |
7612 | + hn = !!au_hn(hi); | |
7613 | + do_pri_inode(bindex, hi->hi_inode, hn, hi->hi_whdentry); | |
53392da6 | 7614 | + } |
1facf9fc | 7615 | +} |
7616 | + | |
2cbb1c4b JR |
7617 | +void au_dpri_dalias(struct inode *inode) |
7618 | +{ | |
7619 | + struct dentry *d; | |
7620 | + | |
7621 | + spin_lock(&inode->i_lock); | |
c1595e42 | 7622 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) |
2cbb1c4b JR |
7623 | + au_dpri_dentry(d); |
7624 | + spin_unlock(&inode->i_lock); | |
7625 | +} | |
7626 | + | |
1facf9fc | 7627 | +static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry) |
7628 | +{ | |
7629 | + struct dentry *wh = NULL; | |
53392da6 | 7630 | + int hn; |
5afbbe0d | 7631 | + struct inode *inode; |
076b876e | 7632 | + struct au_iinfo *iinfo; |
5afbbe0d | 7633 | + struct au_hinode *hi; |
1facf9fc | 7634 | + |
7635 | + if (!dentry || IS_ERR(dentry)) { | |
7636 | + dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry)); | |
7637 | + return -1; | |
7638 | + } | |
7639 | + /* do not call dget_parent() here */ | |
027c5e7a | 7640 | + /* note: access d_xxx without d_lock */ |
523b37e3 AM |
7641 | + dpri("d%d: %p, %pd2?, %s, cnt %d, flags 0x%x, %shashed\n", |
7642 | + bindex, dentry, dentry, | |
1facf9fc | 7643 | + dentry->d_sb ? au_sbtype(dentry->d_sb) : "??", |
c1595e42 | 7644 | + au_dcount(dentry), dentry->d_flags, |
523b37e3 | 7645 | + d_unhashed(dentry) ? "un" : ""); |
53392da6 | 7646 | + hn = -1; |
5afbbe0d AM |
7647 | + inode = NULL; |
7648 | + if (d_is_positive(dentry)) | |
7649 | + inode = d_inode(dentry); | |
7650 | + if (inode | |
7651 | + && au_test_aufs(dentry->d_sb) | |
7652 | + && bindex >= 0 | |
7653 | + && !au_is_bad_inode(inode)) { | |
7654 | + iinfo = au_ii(inode); | |
7655 | + hi = au_hinode(iinfo, bindex); | |
7656 | + hn = !!au_hn(hi); | |
7657 | + wh = hi->hi_whdentry; | |
7658 | + } | |
7659 | + do_pri_inode(bindex, inode, hn, wh); | |
1facf9fc | 7660 | + return 0; |
7661 | +} | |
7662 | + | |
7663 | +void au_dpri_dentry(struct dentry *dentry) | |
7664 | +{ | |
7665 | + struct au_dinfo *dinfo; | |
7666 | + aufs_bindex_t bindex; | |
7667 | + int err; | |
7668 | + | |
7669 | + err = do_pri_dentry(-1, dentry); | |
7670 | + if (err || !au_test_aufs(dentry->d_sb)) | |
7671 | + return; | |
7672 | + | |
7673 | + dinfo = au_di(dentry); | |
7674 | + if (!dinfo) | |
7675 | + return; | |
5afbbe0d AM |
7676 | + dpri("d-1: btop %d, bbot %d, bwh %d, bdiropq %d, gen %d, tmp %d\n", |
7677 | + dinfo->di_btop, dinfo->di_bbot, | |
38d290e6 JR |
7678 | + dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry), |
7679 | + dinfo->di_tmpfile); | |
5afbbe0d | 7680 | + if (dinfo->di_btop < 0) |
1facf9fc | 7681 | + return; |
5afbbe0d AM |
7682 | + for (bindex = dinfo->di_btop; bindex <= dinfo->di_bbot; bindex++) |
7683 | + do_pri_dentry(bindex, au_hdentry(dinfo, bindex)->hd_dentry); | |
1facf9fc | 7684 | +} |
7685 | + | |
7686 | +static int do_pri_file(aufs_bindex_t bindex, struct file *file) | |
7687 | +{ | |
7688 | + char a[32]; | |
7689 | + | |
7690 | + if (!file || IS_ERR(file)) { | |
7691 | + dpri("f%d: err %ld\n", bindex, PTR_ERR(file)); | |
7692 | + return -1; | |
7693 | + } | |
7694 | + a[0] = 0; | |
7695 | + if (bindex < 0 | |
b912730e | 7696 | + && !IS_ERR_OR_NULL(file->f_path.dentry) |
2000de60 | 7697 | + && au_test_aufs(file->f_path.dentry->d_sb) |
1facf9fc | 7698 | + && au_fi(file)) |
e49829fe | 7699 | + snprintf(a, sizeof(a), ", gen %d, mmapped %d", |
2cbb1c4b | 7700 | + au_figen(file), atomic_read(&au_fi(file)->fi_mmapped)); |
b752ccd1 | 7701 | + dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n", |
1facf9fc | 7702 | + bindex, file->f_mode, file->f_flags, (long)file_count(file), |
b752ccd1 | 7703 | + file->f_version, file->f_pos, a); |
b912730e | 7704 | + if (!IS_ERR_OR_NULL(file->f_path.dentry)) |
2000de60 | 7705 | + do_pri_dentry(bindex, file->f_path.dentry); |
1facf9fc | 7706 | + return 0; |
7707 | +} | |
7708 | + | |
7709 | +void au_dpri_file(struct file *file) | |
7710 | +{ | |
7711 | + struct au_finfo *finfo; | |
4a4d8108 AM |
7712 | + struct au_fidir *fidir; |
7713 | + struct au_hfile *hfile; | |
1facf9fc | 7714 | + aufs_bindex_t bindex; |
7715 | + int err; | |
7716 | + | |
7717 | + err = do_pri_file(-1, file); | |
2000de60 | 7718 | + if (err |
b912730e | 7719 | + || IS_ERR_OR_NULL(file->f_path.dentry) |
2000de60 | 7720 | + || !au_test_aufs(file->f_path.dentry->d_sb)) |
1facf9fc | 7721 | + return; |
7722 | + | |
7723 | + finfo = au_fi(file); | |
7724 | + if (!finfo) | |
7725 | + return; | |
4a4d8108 | 7726 | + if (finfo->fi_btop < 0) |
1facf9fc | 7727 | + return; |
4a4d8108 AM |
7728 | + fidir = finfo->fi_hdir; |
7729 | + if (!fidir) | |
7730 | + do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file); | |
7731 | + else | |
e49829fe JR |
7732 | + for (bindex = finfo->fi_btop; |
7733 | + bindex >= 0 && bindex <= fidir->fd_bbot; | |
4a4d8108 AM |
7734 | + bindex++) { |
7735 | + hfile = fidir->fd_hfile + bindex; | |
7736 | + do_pri_file(bindex, hfile ? hfile->hf_file : NULL); | |
7737 | + } | |
1facf9fc | 7738 | +} |
7739 | + | |
7740 | +static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br) | |
7741 | +{ | |
7742 | + struct vfsmount *mnt; | |
7743 | + struct super_block *sb; | |
7744 | + | |
7745 | + if (!br || IS_ERR(br)) | |
7746 | + goto out; | |
86dc4139 | 7747 | + mnt = au_br_mnt(br); |
1facf9fc | 7748 | + if (!mnt || IS_ERR(mnt)) |
7749 | + goto out; | |
7750 | + sb = mnt->mnt_sb; | |
7751 | + if (!sb || IS_ERR(sb)) | |
7752 | + goto out; | |
7753 | + | |
5afbbe0d | 7754 | + dpri("s%d: {perm 0x%x, id %d, cnt %lld, wbr %p}, " |
b752ccd1 | 7755 | + "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, " |
1facf9fc | 7756 | + "xino %d\n", |
5afbbe0d | 7757 | + bindex, br->br_perm, br->br_id, au_br_count(br), |
1e00d052 | 7758 | + br->br_wbr, au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev), |
b752ccd1 | 7759 | + sb->s_flags, sb->s_count, |
062440b3 | 7760 | + atomic_read(&sb->s_active), !!au_xino_file(br)); |
1facf9fc | 7761 | + return 0; |
7762 | + | |
4f0767ce | 7763 | +out: |
1facf9fc | 7764 | + dpri("s%d: err %ld\n", bindex, PTR_ERR(br)); |
7765 | + return -1; | |
7766 | +} | |
7767 | + | |
7768 | +void au_dpri_sb(struct super_block *sb) | |
7769 | +{ | |
7770 | + struct au_sbinfo *sbinfo; | |
7771 | + aufs_bindex_t bindex; | |
7772 | + int err; | |
7773 | + /* to reuduce stack size */ | |
7774 | + struct { | |
7775 | + struct vfsmount mnt; | |
7776 | + struct au_branch fake; | |
7777 | + } *a; | |
7778 | + | |
7779 | + /* this function can be called from magic sysrq */ | |
7780 | + a = kzalloc(sizeof(*a), GFP_ATOMIC); | |
7781 | + if (unlikely(!a)) { | |
7782 | + dpri("no memory\n"); | |
7783 | + return; | |
7784 | + } | |
7785 | + | |
7786 | + a->mnt.mnt_sb = sb; | |
86dc4139 | 7787 | + a->fake.br_path.mnt = &a->mnt; |
5afbbe0d | 7788 | + au_br_count_init(&a->fake); |
1facf9fc | 7789 | + err = do_pri_br(-1, &a->fake); |
5afbbe0d | 7790 | + au_br_count_fin(&a->fake); |
1c60b727 | 7791 | + kfree(a); |
1facf9fc | 7792 | + dpri("dev 0x%x\n", sb->s_dev); |
7793 | + if (err || !au_test_aufs(sb)) | |
7794 | + return; | |
7795 | + | |
7796 | + sbinfo = au_sbi(sb); | |
7797 | + if (!sbinfo) | |
7798 | + return; | |
f0c0a007 AM |
7799 | + dpri("nw %d, gen %u, kobj %d\n", |
7800 | + atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation, | |
521ced18 | 7801 | + kref_read(&sbinfo->si_kobj.kref)); |
5afbbe0d | 7802 | + for (bindex = 0; bindex <= sbinfo->si_bbot; bindex++) |
1facf9fc | 7803 | + do_pri_br(bindex, sbinfo->si_branch[0 + bindex]); |
7804 | +} | |
7805 | + | |
7806 | +/* ---------------------------------------------------------------------- */ | |
7807 | + | |
027c5e7a AM |
7808 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line) |
7809 | +{ | |
5527c038 | 7810 | + struct inode *h_inode, *inode = d_inode(dentry); |
027c5e7a | 7811 | + struct dentry *h_dentry; |
5afbbe0d | 7812 | + aufs_bindex_t bindex, bbot, bi; |
027c5e7a AM |
7813 | + |
7814 | + if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */) | |
7815 | + return; | |
7816 | + | |
5afbbe0d AM |
7817 | + bbot = au_dbbot(dentry); |
7818 | + bi = au_ibbot(inode); | |
7819 | + if (bi < bbot) | |
7820 | + bbot = bi; | |
7821 | + bindex = au_dbtop(dentry); | |
7822 | + bi = au_ibtop(inode); | |
027c5e7a AM |
7823 | + if (bi > bindex) |
7824 | + bindex = bi; | |
7825 | + | |
5afbbe0d | 7826 | + for (; bindex <= bbot; bindex++) { |
027c5e7a AM |
7827 | + h_dentry = au_h_dptr(dentry, bindex); |
7828 | + if (!h_dentry) | |
7829 | + continue; | |
7830 | + h_inode = au_h_iptr(inode, bindex); | |
5527c038 | 7831 | + if (unlikely(h_inode != d_inode(h_dentry))) { |
392086de | 7832 | + au_debug_on(); |
027c5e7a AM |
7833 | + AuDbg("b%d, %s:%d\n", bindex, func, line); |
7834 | + AuDbgDentry(dentry); | |
7835 | + AuDbgInode(inode); | |
392086de | 7836 | + au_debug_off(); |
027c5e7a AM |
7837 | + BUG(); |
7838 | + } | |
7839 | + } | |
7840 | +} | |
7841 | + | |
1facf9fc | 7842 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen) |
7843 | +{ | |
7844 | + int err, i, j; | |
7845 | + struct au_dcsub_pages dpages; | |
7846 | + struct au_dpage *dpage; | |
7847 | + struct dentry **dentries; | |
7848 | + | |
7849 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
7850 | + AuDebugOn(err); | |
027c5e7a | 7851 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1); |
1facf9fc | 7852 | + AuDebugOn(err); |
7853 | + for (i = dpages.ndpage - 1; !err && i >= 0; i--) { | |
7854 | + dpage = dpages.dpages + i; | |
7855 | + dentries = dpage->dentries; | |
7856 | + for (j = dpage->ndentry - 1; !err && j >= 0; j--) | |
027c5e7a | 7857 | + AuDebugOn(au_digen_test(dentries[j], sigen)); |
1facf9fc | 7858 | + } |
7859 | + au_dpages_free(&dpages); | |
7860 | +} | |
7861 | + | |
1facf9fc | 7862 | +void au_dbg_verify_kthread(void) |
7863 | +{ | |
53392da6 | 7864 | + if (au_wkq_test()) { |
1facf9fc | 7865 | + au_dbg_blocked(); |
1e00d052 AM |
7866 | + /* |
7867 | + * It may be recursive, but udba=notify between two aufs mounts, | |
7868 | + * where a single ro branch is shared, is not a problem. | |
7869 | + */ | |
7870 | + /* WARN_ON(1); */ | |
1facf9fc | 7871 | + } |
7872 | +} | |
7873 | + | |
7874 | +/* ---------------------------------------------------------------------- */ | |
7875 | + | |
1facf9fc | 7876 | +int __init au_debug_init(void) |
7877 | +{ | |
7878 | + aufs_bindex_t bindex; | |
7879 | + struct au_vdir_destr destr; | |
7880 | + | |
7881 | + bindex = -1; | |
7882 | + AuDebugOn(bindex >= 0); | |
7883 | + | |
7884 | + destr.len = -1; | |
7885 | + AuDebugOn(destr.len < NAME_MAX); | |
7886 | + | |
7887 | +#ifdef CONFIG_4KSTACKS | |
0c3ec466 | 7888 | + pr_warn("CONFIG_4KSTACKS is defined.\n"); |
1facf9fc | 7889 | +#endif |
7890 | + | |
1facf9fc | 7891 | + return 0; |
7892 | +} | |
7f207e10 AM |
7893 | diff -urN /usr/share/empty/fs/aufs/debug.h linux/fs/aufs/debug.h |
7894 | --- /usr/share/empty/fs/aufs/debug.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 7895 | +++ linux/fs/aufs/debug.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
7896 | @@ -0,0 +1,226 @@ |
7897 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 7898 | +/* |
b00004a5 | 7899 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 7900 | + * |
7901 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7902 | + * it under the terms of the GNU General Public License as published by | |
7903 | + * the Free Software Foundation; either version 2 of the License, or | |
7904 | + * (at your option) any later version. | |
dece6358 AM |
7905 | + * |
7906 | + * This program is distributed in the hope that it will be useful, | |
7907 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7908 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7909 | + * GNU General Public License for more details. | |
7910 | + * | |
7911 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 7912 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 7913 | + */ |
7914 | + | |
7915 | +/* | |
7916 | + * debug print functions | |
7917 | + */ | |
7918 | + | |
7919 | +#ifndef __AUFS_DEBUG_H__ | |
7920 | +#define __AUFS_DEBUG_H__ | |
7921 | + | |
7922 | +#ifdef __KERNEL__ | |
7923 | + | |
392086de | 7924 | +#include <linux/atomic.h> |
4a4d8108 AM |
7925 | +#include <linux/module.h> |
7926 | +#include <linux/kallsyms.h> | |
1facf9fc | 7927 | +#include <linux/sysrq.h> |
4a4d8108 | 7928 | + |
1facf9fc | 7929 | +#ifdef CONFIG_AUFS_DEBUG |
7930 | +#define AuDebugOn(a) BUG_ON(a) | |
7931 | + | |
7932 | +/* module parameter */ | |
392086de AM |
7933 | +extern atomic_t aufs_debug; |
7934 | +static inline void au_debug_on(void) | |
1facf9fc | 7935 | +{ |
392086de AM |
7936 | + atomic_inc(&aufs_debug); |
7937 | +} | |
7938 | +static inline void au_debug_off(void) | |
7939 | +{ | |
7940 | + atomic_dec_if_positive(&aufs_debug); | |
1facf9fc | 7941 | +} |
7942 | + | |
7943 | +static inline int au_debug_test(void) | |
7944 | +{ | |
392086de | 7945 | + return atomic_read(&aufs_debug) > 0; |
1facf9fc | 7946 | +} |
7947 | +#else | |
7948 | +#define AuDebugOn(a) do {} while (0) | |
392086de AM |
7949 | +AuStubVoid(au_debug_on, void) |
7950 | +AuStubVoid(au_debug_off, void) | |
4a4d8108 | 7951 | +AuStubInt0(au_debug_test, void) |
1facf9fc | 7952 | +#endif /* CONFIG_AUFS_DEBUG */ |
7953 | + | |
392086de AM |
7954 | +#define param_check_atomic_t(name, p) __param_check(name, p, atomic_t) |
7955 | + | |
1facf9fc | 7956 | +/* ---------------------------------------------------------------------- */ |
7957 | + | |
7958 | +/* debug print */ | |
7959 | + | |
4a4d8108 | 7960 | +#define AuDbg(fmt, ...) do { \ |
1facf9fc | 7961 | + if (au_debug_test()) \ |
4a4d8108 | 7962 | + pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \ |
1facf9fc | 7963 | +} while (0) |
4a4d8108 AM |
7964 | +#define AuLabel(l) AuDbg(#l "\n") |
7965 | +#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__) | |
7966 | +#define AuWarn1(fmt, ...) do { \ | |
1facf9fc | 7967 | + static unsigned char _c; \ |
7968 | + if (!_c++) \ | |
0c3ec466 | 7969 | + pr_warn(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7970 | +} while (0) |
7971 | + | |
4a4d8108 | 7972 | +#define AuErr1(fmt, ...) do { \ |
1facf9fc | 7973 | + static unsigned char _c; \ |
7974 | + if (!_c++) \ | |
4a4d8108 | 7975 | + pr_err(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7976 | +} while (0) |
7977 | + | |
4a4d8108 | 7978 | +#define AuIOErr1(fmt, ...) do { \ |
1facf9fc | 7979 | + static unsigned char _c; \ |
7980 | + if (!_c++) \ | |
4a4d8108 | 7981 | + AuIOErr(fmt, ##__VA_ARGS__); \ |
1facf9fc | 7982 | +} while (0) |
7983 | + | |
7984 | +#define AuUnsupportMsg "This operation is not supported." \ | |
7985 | + " Please report this application to aufs-users ML." | |
4a4d8108 AM |
7986 | +#define AuUnsupport(fmt, ...) do { \ |
7987 | + pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \ | |
1facf9fc | 7988 | + dump_stack(); \ |
7989 | +} while (0) | |
7990 | + | |
7991 | +#define AuTraceErr(e) do { \ | |
7992 | + if (unlikely((e) < 0)) \ | |
7993 | + AuDbg("err %d\n", (int)(e)); \ | |
7994 | +} while (0) | |
7995 | + | |
7996 | +#define AuTraceErrPtr(p) do { \ | |
7997 | + if (IS_ERR(p)) \ | |
7998 | + AuDbg("err %ld\n", PTR_ERR(p)); \ | |
7999 | +} while (0) | |
8000 | + | |
8001 | +/* dirty macros for debug print, use with "%.*s" and caution */ | |
8002 | +#define AuLNPair(qstr) (qstr)->len, (qstr)->name | |
1facf9fc | 8003 | + |
8004 | +/* ---------------------------------------------------------------------- */ | |
8005 | + | |
dece6358 | 8006 | +struct dentry; |
1facf9fc | 8007 | +#ifdef CONFIG_AUFS_DEBUG |
c1595e42 | 8008 | +extern struct mutex au_dbg_mtx; |
1facf9fc | 8009 | +extern char *au_plevel; |
8010 | +struct au_nhash; | |
8011 | +void au_dpri_whlist(struct au_nhash *whlist); | |
8012 | +struct au_vdir; | |
8013 | +void au_dpri_vdir(struct au_vdir *vdir); | |
dece6358 | 8014 | +struct inode; |
1facf9fc | 8015 | +void au_dpri_inode(struct inode *inode); |
2cbb1c4b | 8016 | +void au_dpri_dalias(struct inode *inode); |
1facf9fc | 8017 | +void au_dpri_dentry(struct dentry *dentry); |
dece6358 | 8018 | +struct file; |
1facf9fc | 8019 | +void au_dpri_file(struct file *filp); |
dece6358 | 8020 | +struct super_block; |
1facf9fc | 8021 | +void au_dpri_sb(struct super_block *sb); |
8022 | + | |
027c5e7a AM |
8023 | +#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__) |
8024 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line); | |
1facf9fc | 8025 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen); |
1facf9fc | 8026 | +void au_dbg_verify_kthread(void); |
8027 | + | |
8028 | +int __init au_debug_init(void); | |
7e9cd9fe | 8029 | + |
1facf9fc | 8030 | +#define AuDbgWhlist(w) do { \ |
c1595e42 | 8031 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8032 | + AuDbg(#w "\n"); \ |
8033 | + au_dpri_whlist(w); \ | |
c1595e42 | 8034 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8035 | +} while (0) |
8036 | + | |
8037 | +#define AuDbgVdir(v) do { \ | |
c1595e42 | 8038 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8039 | + AuDbg(#v "\n"); \ |
8040 | + au_dpri_vdir(v); \ | |
c1595e42 | 8041 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8042 | +} while (0) |
8043 | + | |
8044 | +#define AuDbgInode(i) do { \ | |
c1595e42 | 8045 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8046 | + AuDbg(#i "\n"); \ |
8047 | + au_dpri_inode(i); \ | |
c1595e42 | 8048 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8049 | +} while (0) |
8050 | + | |
2cbb1c4b | 8051 | +#define AuDbgDAlias(i) do { \ |
c1595e42 | 8052 | + mutex_lock(&au_dbg_mtx); \ |
2cbb1c4b JR |
8053 | + AuDbg(#i "\n"); \ |
8054 | + au_dpri_dalias(i); \ | |
c1595e42 | 8055 | + mutex_unlock(&au_dbg_mtx); \ |
2cbb1c4b JR |
8056 | +} while (0) |
8057 | + | |
1facf9fc | 8058 | +#define AuDbgDentry(d) do { \ |
c1595e42 | 8059 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8060 | + AuDbg(#d "\n"); \ |
8061 | + au_dpri_dentry(d); \ | |
c1595e42 | 8062 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8063 | +} while (0) |
8064 | + | |
8065 | +#define AuDbgFile(f) do { \ | |
c1595e42 | 8066 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8067 | + AuDbg(#f "\n"); \ |
8068 | + au_dpri_file(f); \ | |
c1595e42 | 8069 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8070 | +} while (0) |
8071 | + | |
8072 | +#define AuDbgSb(sb) do { \ | |
c1595e42 | 8073 | + mutex_lock(&au_dbg_mtx); \ |
1facf9fc | 8074 | + AuDbg(#sb "\n"); \ |
8075 | + au_dpri_sb(sb); \ | |
c1595e42 | 8076 | + mutex_unlock(&au_dbg_mtx); \ |
1facf9fc | 8077 | +} while (0) |
8078 | + | |
4a4d8108 AM |
8079 | +#define AuDbgSym(addr) do { \ |
8080 | + char sym[KSYM_SYMBOL_LEN]; \ | |
8081 | + sprint_symbol(sym, (unsigned long)addr); \ | |
8082 | + AuDbg("%s\n", sym); \ | |
8083 | +} while (0) | |
1facf9fc | 8084 | +#else |
027c5e7a | 8085 | +AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry) |
4a4d8108 AM |
8086 | +AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen) |
8087 | +AuStubVoid(au_dbg_verify_kthread, void) | |
8088 | +AuStubInt0(__init au_debug_init, void) | |
1facf9fc | 8089 | + |
1facf9fc | 8090 | +#define AuDbgWhlist(w) do {} while (0) |
8091 | +#define AuDbgVdir(v) do {} while (0) | |
8092 | +#define AuDbgInode(i) do {} while (0) | |
2cbb1c4b | 8093 | +#define AuDbgDAlias(i) do {} while (0) |
1facf9fc | 8094 | +#define AuDbgDentry(d) do {} while (0) |
8095 | +#define AuDbgFile(f) do {} while (0) | |
8096 | +#define AuDbgSb(sb) do {} while (0) | |
4a4d8108 | 8097 | +#define AuDbgSym(addr) do {} while (0) |
1facf9fc | 8098 | +#endif /* CONFIG_AUFS_DEBUG */ |
8099 | + | |
8100 | +/* ---------------------------------------------------------------------- */ | |
8101 | + | |
8102 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
8103 | +int __init au_sysrq_init(void); | |
8104 | +void au_sysrq_fin(void); | |
8105 | + | |
8106 | +#ifdef CONFIG_HW_CONSOLE | |
8107 | +#define au_dbg_blocked() do { \ | |
8108 | + WARN_ON(1); \ | |
0c5527e5 | 8109 | + handle_sysrq('w'); \ |
1facf9fc | 8110 | +} while (0) |
8111 | +#else | |
4a4d8108 | 8112 | +AuStubVoid(au_dbg_blocked, void) |
1facf9fc | 8113 | +#endif |
8114 | + | |
8115 | +#else | |
4a4d8108 AM |
8116 | +AuStubInt0(__init au_sysrq_init, void) |
8117 | +AuStubVoid(au_sysrq_fin, void) | |
8118 | +AuStubVoid(au_dbg_blocked, void) | |
1facf9fc | 8119 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ |
8120 | + | |
8121 | +#endif /* __KERNEL__ */ | |
8122 | +#endif /* __AUFS_DEBUG_H__ */ | |
7f207e10 AM |
8123 | diff -urN /usr/share/empty/fs/aufs/dentry.c linux/fs/aufs/dentry.c |
8124 | --- /usr/share/empty/fs/aufs/dentry.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 8125 | +++ linux/fs/aufs/dentry.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 8126 | @@ -0,0 +1,1153 @@ |
cd7a4cd9 | 8127 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 8128 | +/* |
b00004a5 | 8129 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 8130 | + * |
8131 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8132 | + * it under the terms of the GNU General Public License as published by | |
8133 | + * the Free Software Foundation; either version 2 of the License, or | |
8134 | + * (at your option) any later version. | |
dece6358 AM |
8135 | + * |
8136 | + * This program is distributed in the hope that it will be useful, | |
8137 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8138 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8139 | + * GNU General Public License for more details. | |
8140 | + * | |
8141 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 8142 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 8143 | + */ |
8144 | + | |
8145 | +/* | |
8146 | + * lookup and dentry operations | |
8147 | + */ | |
8148 | + | |
dece6358 | 8149 | +#include <linux/namei.h> |
1facf9fc | 8150 | +#include "aufs.h" |
8151 | + | |
1facf9fc | 8152 | +/* |
8153 | + * returns positive/negative dentry, NULL or an error. | |
8154 | + * NULL means whiteout-ed or not-found. | |
8155 | + */ | |
8156 | +static struct dentry* | |
8157 | +au_do_lookup(struct dentry *h_parent, struct dentry *dentry, | |
8b6a4947 | 8158 | + aufs_bindex_t bindex, struct au_do_lookup_args *args) |
1facf9fc | 8159 | +{ |
8160 | + struct dentry *h_dentry; | |
2000de60 | 8161 | + struct inode *h_inode; |
1facf9fc | 8162 | + struct au_branch *br; |
8163 | + int wh_found, opq; | |
8164 | + unsigned char wh_able; | |
8165 | + const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG); | |
076b876e AM |
8166 | + const unsigned char ignore_perm = !!au_ftest_lkup(args->flags, |
8167 | + IGNORE_PERM); | |
1facf9fc | 8168 | + |
1facf9fc | 8169 | + wh_found = 0; |
8170 | + br = au_sbr(dentry->d_sb, bindex); | |
8171 | + wh_able = !!au_br_whable(br->br_perm); | |
8172 | + if (wh_able) | |
8b6a4947 | 8173 | + wh_found = au_wh_test(h_parent, &args->whname, ignore_perm); |
1facf9fc | 8174 | + h_dentry = ERR_PTR(wh_found); |
8175 | + if (!wh_found) | |
8176 | + goto real_lookup; | |
8177 | + if (unlikely(wh_found < 0)) | |
8178 | + goto out; | |
8179 | + | |
8180 | + /* We found a whiteout */ | |
5afbbe0d | 8181 | + /* au_set_dbbot(dentry, bindex); */ |
1facf9fc | 8182 | + au_set_dbwh(dentry, bindex); |
8183 | + if (!allow_neg) | |
8184 | + return NULL; /* success */ | |
8185 | + | |
4f0767ce | 8186 | +real_lookup: |
076b876e | 8187 | + if (!ignore_perm) |
8b6a4947 | 8188 | + h_dentry = vfsub_lkup_one(args->name, h_parent); |
076b876e | 8189 | + else |
8b6a4947 | 8190 | + h_dentry = au_sio_lkup_one(args->name, h_parent); |
2000de60 JR |
8191 | + if (IS_ERR(h_dentry)) { |
8192 | + if (PTR_ERR(h_dentry) == -ENAMETOOLONG | |
8193 | + && !allow_neg) | |
8194 | + h_dentry = NULL; | |
1facf9fc | 8195 | + goto out; |
2000de60 | 8196 | + } |
1facf9fc | 8197 | + |
5527c038 JR |
8198 | + h_inode = d_inode(h_dentry); |
8199 | + if (d_is_negative(h_dentry)) { | |
1facf9fc | 8200 | + if (!allow_neg) |
8201 | + goto out_neg; | |
8202 | + } else if (wh_found | |
8203 | + || (args->type && args->type != (h_inode->i_mode & S_IFMT))) | |
8204 | + goto out_neg; | |
8b6a4947 AM |
8205 | + else if (au_ftest_lkup(args->flags, DIRREN) |
8206 | + /* && h_inode */ | |
8207 | + && !au_dr_lkup_h_ino(args, bindex, h_inode->i_ino)) { | |
8208 | + AuDbg("b%d %pd ignored hi%llu\n", bindex, h_dentry, | |
8209 | + (unsigned long long)h_inode->i_ino); | |
8210 | + goto out_neg; | |
8211 | + } | |
1facf9fc | 8212 | + |
5afbbe0d AM |
8213 | + if (au_dbbot(dentry) <= bindex) |
8214 | + au_set_dbbot(dentry, bindex); | |
8215 | + if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) | |
8216 | + au_set_dbtop(dentry, bindex); | |
1facf9fc | 8217 | + au_set_h_dptr(dentry, bindex, h_dentry); |
8218 | + | |
2000de60 JR |
8219 | + if (!d_is_dir(h_dentry) |
8220 | + || !wh_able | |
5527c038 | 8221 | + || (d_really_is_positive(dentry) && !d_is_dir(dentry))) |
1facf9fc | 8222 | + goto out; /* success */ |
8223 | + | |
be118d29 | 8224 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); |
076b876e | 8225 | + opq = au_diropq_test(h_dentry); |
3c1bdaff | 8226 | + inode_unlock_shared(h_inode); |
1facf9fc | 8227 | + if (opq > 0) |
8228 | + au_set_dbdiropq(dentry, bindex); | |
8229 | + else if (unlikely(opq < 0)) { | |
8230 | + au_set_h_dptr(dentry, bindex, NULL); | |
8231 | + h_dentry = ERR_PTR(opq); | |
8232 | + } | |
8233 | + goto out; | |
8234 | + | |
4f0767ce | 8235 | +out_neg: |
1facf9fc | 8236 | + dput(h_dentry); |
8237 | + h_dentry = NULL; | |
4f0767ce | 8238 | +out: |
1facf9fc | 8239 | + return h_dentry; |
8240 | +} | |
8241 | + | |
dece6358 AM |
8242 | +static int au_test_shwh(struct super_block *sb, const struct qstr *name) |
8243 | +{ | |
8244 | + if (unlikely(!au_opt_test(au_mntflags(sb), SHWH) | |
8245 | + && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))) | |
8246 | + return -EPERM; | |
8247 | + return 0; | |
8248 | +} | |
8249 | + | |
1facf9fc | 8250 | +/* |
8251 | + * returns the number of lower positive dentries, | |
8252 | + * otherwise an error. | |
8253 | + * can be called at unlinking with @type is zero. | |
8254 | + */ | |
5afbbe0d AM |
8255 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, |
8256 | + unsigned int flags) | |
1facf9fc | 8257 | +{ |
8258 | + int npositive, err; | |
8259 | + aufs_bindex_t bindex, btail, bdiropq; | |
8b6a4947 | 8260 | + unsigned char isdir, dirperm1, dirren; |
1facf9fc | 8261 | + struct au_do_lookup_args args = { |
8b6a4947 AM |
8262 | + .flags = flags, |
8263 | + .name = &dentry->d_name | |
1facf9fc | 8264 | + }; |
1facf9fc | 8265 | + struct dentry *parent; |
076b876e | 8266 | + struct super_block *sb; |
1facf9fc | 8267 | + |
076b876e | 8268 | + sb = dentry->d_sb; |
8b6a4947 | 8269 | + err = au_test_shwh(sb, args.name); |
dece6358 | 8270 | + if (unlikely(err)) |
1facf9fc | 8271 | + goto out; |
8272 | + | |
8b6a4947 | 8273 | + err = au_wh_name_alloc(&args.whname, args.name); |
1facf9fc | 8274 | + if (unlikely(err)) |
8275 | + goto out; | |
8276 | + | |
2000de60 | 8277 | + isdir = !!d_is_dir(dentry); |
076b876e | 8278 | + dirperm1 = !!au_opt_test(au_mntflags(sb), DIRPERM1); |
8b6a4947 AM |
8279 | + dirren = !!au_opt_test(au_mntflags(sb), DIRREN); |
8280 | + if (dirren) | |
8281 | + au_fset_lkup(args.flags, DIRREN); | |
1facf9fc | 8282 | + |
8283 | + npositive = 0; | |
4a4d8108 | 8284 | + parent = dget_parent(dentry); |
1facf9fc | 8285 | + btail = au_dbtaildir(parent); |
5afbbe0d | 8286 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 8287 | + struct dentry *h_parent, *h_dentry; |
8288 | + struct inode *h_inode, *h_dir; | |
8b6a4947 | 8289 | + struct au_branch *br; |
1facf9fc | 8290 | + |
8291 | + h_dentry = au_h_dptr(dentry, bindex); | |
8292 | + if (h_dentry) { | |
5527c038 | 8293 | + if (d_is_positive(h_dentry)) |
1facf9fc | 8294 | + npositive++; |
5afbbe0d | 8295 | + break; |
1facf9fc | 8296 | + } |
8297 | + h_parent = au_h_dptr(parent, bindex); | |
2000de60 | 8298 | + if (!h_parent || !d_is_dir(h_parent)) |
1facf9fc | 8299 | + continue; |
8300 | + | |
8b6a4947 AM |
8301 | + if (dirren) { |
8302 | + /* if the inum matches, then use the prepared name */ | |
8303 | + err = au_dr_lkup_name(&args, bindex); | |
8304 | + if (unlikely(err)) | |
8305 | + goto out_parent; | |
8306 | + } | |
8307 | + | |
5527c038 | 8308 | + h_dir = d_inode(h_parent); |
be118d29 | 8309 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
8b6a4947 | 8310 | + h_dentry = au_do_lookup(h_parent, dentry, bindex, &args); |
3c1bdaff | 8311 | + inode_unlock_shared(h_dir); |
1facf9fc | 8312 | + err = PTR_ERR(h_dentry); |
8313 | + if (IS_ERR(h_dentry)) | |
4a4d8108 | 8314 | + goto out_parent; |
2000de60 JR |
8315 | + if (h_dentry) |
8316 | + au_fclr_lkup(args.flags, ALLOW_NEG); | |
076b876e AM |
8317 | + if (dirperm1) |
8318 | + au_fset_lkup(args.flags, IGNORE_PERM); | |
1facf9fc | 8319 | + |
79b8bda9 | 8320 | + if (au_dbwh(dentry) == bindex) |
1facf9fc | 8321 | + break; |
8322 | + if (!h_dentry) | |
8323 | + continue; | |
5527c038 | 8324 | + if (d_is_negative(h_dentry)) |
1facf9fc | 8325 | + continue; |
5527c038 | 8326 | + h_inode = d_inode(h_dentry); |
1facf9fc | 8327 | + npositive++; |
8328 | + if (!args.type) | |
8329 | + args.type = h_inode->i_mode & S_IFMT; | |
8330 | + if (args.type != S_IFDIR) | |
8331 | + break; | |
8332 | + else if (isdir) { | |
8333 | + /* the type of lower may be different */ | |
8334 | + bdiropq = au_dbdiropq(dentry); | |
8335 | + if (bdiropq >= 0 && bdiropq <= bindex) | |
8336 | + break; | |
8337 | + } | |
8b6a4947 AM |
8338 | + br = au_sbr(sb, bindex); |
8339 | + if (dirren | |
8340 | + && au_dr_hino_test_add(&br->br_dirren, h_inode->i_ino, | |
8341 | + /*add_ent*/NULL)) { | |
8342 | + /* prepare next name to lookup */ | |
8343 | + err = au_dr_lkup(&args, dentry, bindex); | |
8344 | + if (unlikely(err)) | |
8345 | + goto out_parent; | |
8346 | + } | |
1facf9fc | 8347 | + } |
8348 | + | |
8349 | + if (npositive) { | |
8350 | + AuLabel(positive); | |
5afbbe0d | 8351 | + au_update_dbtop(dentry); |
1facf9fc | 8352 | + } |
8353 | + err = npositive; | |
076b876e | 8354 | + if (unlikely(!au_opt_test(au_mntflags(sb), UDBA_NONE) |
5afbbe0d | 8355 | + && au_dbtop(dentry) < 0)) { |
1facf9fc | 8356 | + err = -EIO; |
523b37e3 AM |
8357 | + AuIOErr("both of real entry and whiteout found, %pd, err %d\n", |
8358 | + dentry, err); | |
027c5e7a | 8359 | + } |
1facf9fc | 8360 | + |
4f0767ce | 8361 | +out_parent: |
4a4d8108 | 8362 | + dput(parent); |
8b6a4947 AM |
8363 | + kfree(args.whname.name); |
8364 | + if (dirren) | |
8365 | + au_dr_lkup_fin(&args); | |
4f0767ce | 8366 | +out: |
1facf9fc | 8367 | + return err; |
8368 | +} | |
8369 | + | |
076b876e | 8370 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent) |
1facf9fc | 8371 | +{ |
8372 | + struct dentry *dentry; | |
8373 | + int wkq_err; | |
8374 | + | |
5527c038 | 8375 | + if (!au_test_h_perm_sio(d_inode(parent), MAY_EXEC)) |
b4510431 | 8376 | + dentry = vfsub_lkup_one(name, parent); |
1facf9fc | 8377 | + else { |
b4510431 AM |
8378 | + struct vfsub_lkup_one_args args = { |
8379 | + .errp = &dentry, | |
8380 | + .name = name, | |
8381 | + .parent = parent | |
1facf9fc | 8382 | + }; |
8383 | + | |
b4510431 | 8384 | + wkq_err = au_wkq_wait(vfsub_call_lkup_one, &args); |
1facf9fc | 8385 | + if (unlikely(wkq_err)) |
8386 | + dentry = ERR_PTR(wkq_err); | |
8387 | + } | |
8388 | + | |
8389 | + return dentry; | |
8390 | +} | |
8391 | + | |
8392 | +/* | |
8393 | + * lookup @dentry on @bindex which should be negative. | |
8394 | + */ | |
86dc4139 | 8395 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh) |
1facf9fc | 8396 | +{ |
8397 | + int err; | |
8398 | + struct dentry *parent, *h_parent, *h_dentry; | |
86dc4139 | 8399 | + struct au_branch *br; |
1facf9fc | 8400 | + |
1facf9fc | 8401 | + parent = dget_parent(dentry); |
8402 | + h_parent = au_h_dptr(parent, bindex); | |
86dc4139 AM |
8403 | + br = au_sbr(dentry->d_sb, bindex); |
8404 | + if (wh) | |
8405 | + h_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
8406 | + else | |
076b876e | 8407 | + h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent); |
1facf9fc | 8408 | + err = PTR_ERR(h_dentry); |
8409 | + if (IS_ERR(h_dentry)) | |
8410 | + goto out; | |
5527c038 | 8411 | + if (unlikely(d_is_positive(h_dentry))) { |
1facf9fc | 8412 | + err = -EIO; |
523b37e3 | 8413 | + AuIOErr("%pd should be negative on b%d.\n", h_dentry, bindex); |
1facf9fc | 8414 | + dput(h_dentry); |
8415 | + goto out; | |
8416 | + } | |
8417 | + | |
4a4d8108 | 8418 | + err = 0; |
5afbbe0d AM |
8419 | + if (bindex < au_dbtop(dentry)) |
8420 | + au_set_dbtop(dentry, bindex); | |
8421 | + if (au_dbbot(dentry) < bindex) | |
8422 | + au_set_dbbot(dentry, bindex); | |
1facf9fc | 8423 | + au_set_h_dptr(dentry, bindex, h_dentry); |
1facf9fc | 8424 | + |
4f0767ce | 8425 | +out: |
1facf9fc | 8426 | + dput(parent); |
8427 | + return err; | |
8428 | +} | |
8429 | + | |
8430 | +/* ---------------------------------------------------------------------- */ | |
8431 | + | |
8432 | +/* subset of struct inode */ | |
8433 | +struct au_iattr { | |
8434 | + unsigned long i_ino; | |
8435 | + /* unsigned int i_nlink; */ | |
0c3ec466 AM |
8436 | + kuid_t i_uid; |
8437 | + kgid_t i_gid; | |
1facf9fc | 8438 | + u64 i_version; |
8439 | +/* | |
8440 | + loff_t i_size; | |
8441 | + blkcnt_t i_blocks; | |
8442 | +*/ | |
8443 | + umode_t i_mode; | |
8444 | +}; | |
8445 | + | |
8446 | +static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode) | |
8447 | +{ | |
8448 | + ia->i_ino = h_inode->i_ino; | |
8449 | + /* ia->i_nlink = h_inode->i_nlink; */ | |
8450 | + ia->i_uid = h_inode->i_uid; | |
8451 | + ia->i_gid = h_inode->i_gid; | |
be118d29 | 8452 | + ia->i_version = inode_query_iversion(h_inode); |
1facf9fc | 8453 | +/* |
8454 | + ia->i_size = h_inode->i_size; | |
8455 | + ia->i_blocks = h_inode->i_blocks; | |
8456 | +*/ | |
8457 | + ia->i_mode = (h_inode->i_mode & S_IFMT); | |
8458 | +} | |
8459 | + | |
8460 | +static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode) | |
8461 | +{ | |
8462 | + return ia->i_ino != h_inode->i_ino | |
8463 | + /* || ia->i_nlink != h_inode->i_nlink */ | |
0c3ec466 | 8464 | + || !uid_eq(ia->i_uid, h_inode->i_uid) |
2dfbb274 | 8465 | + || !gid_eq(ia->i_gid, h_inode->i_gid) |
be118d29 | 8466 | + || !inode_eq_iversion(h_inode, ia->i_version) |
1facf9fc | 8467 | +/* |
8468 | + || ia->i_size != h_inode->i_size | |
8469 | + || ia->i_blocks != h_inode->i_blocks | |
8470 | +*/ | |
8471 | + || ia->i_mode != (h_inode->i_mode & S_IFMT); | |
8472 | +} | |
8473 | + | |
8474 | +static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent, | |
8475 | + struct au_branch *br) | |
8476 | +{ | |
8477 | + int err; | |
8478 | + struct au_iattr ia; | |
8479 | + struct inode *h_inode; | |
8480 | + struct dentry *h_d; | |
8481 | + struct super_block *h_sb; | |
8482 | + | |
8483 | + err = 0; | |
8484 | + memset(&ia, -1, sizeof(ia)); | |
8485 | + h_sb = h_dentry->d_sb; | |
5527c038 JR |
8486 | + h_inode = NULL; |
8487 | + if (d_is_positive(h_dentry)) { | |
8488 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 8489 | + au_iattr_save(&ia, h_inode); |
5527c038 | 8490 | + } else if (au_test_nfs(h_sb) || au_test_fuse(h_sb)) |
1facf9fc | 8491 | + /* nfs d_revalidate may return 0 for negative dentry */ |
8492 | + /* fuse d_revalidate always return 0 for negative dentry */ | |
8493 | + goto out; | |
8494 | + | |
8495 | + /* main purpose is namei.c:cached_lookup() and d_revalidate */ | |
b4510431 | 8496 | + h_d = vfsub_lkup_one(&h_dentry->d_name, h_parent); |
1facf9fc | 8497 | + err = PTR_ERR(h_d); |
8498 | + if (IS_ERR(h_d)) | |
8499 | + goto out; | |
8500 | + | |
8501 | + err = 0; | |
8502 | + if (unlikely(h_d != h_dentry | |
5527c038 | 8503 | + || d_inode(h_d) != h_inode |
1facf9fc | 8504 | + || (h_inode && au_iattr_test(&ia, h_inode)))) |
8505 | + err = au_busy_or_stale(); | |
8506 | + dput(h_d); | |
8507 | + | |
4f0767ce | 8508 | +out: |
1facf9fc | 8509 | + AuTraceErr(err); |
8510 | + return err; | |
8511 | +} | |
8512 | + | |
8513 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
8514 | + struct dentry *h_parent, struct au_branch *br) | |
8515 | +{ | |
8516 | + int err; | |
8517 | + | |
8518 | + err = 0; | |
027c5e7a AM |
8519 | + if (udba == AuOpt_UDBA_REVAL |
8520 | + && !au_test_fs_remote(h_dentry->d_sb)) { | |
1facf9fc | 8521 | + IMustLock(h_dir); |
5527c038 | 8522 | + err = (d_inode(h_dentry->d_parent) != h_dir); |
027c5e7a | 8523 | + } else if (udba != AuOpt_UDBA_NONE) |
1facf9fc | 8524 | + err = au_h_verify_dentry(h_dentry, h_parent, br); |
8525 | + | |
8526 | + return err; | |
8527 | +} | |
8528 | + | |
8529 | +/* ---------------------------------------------------------------------- */ | |
8530 | + | |
027c5e7a | 8531 | +static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent) |
1facf9fc | 8532 | +{ |
027c5e7a | 8533 | + int err; |
5afbbe0d | 8534 | + aufs_bindex_t new_bindex, bindex, bbot, bwh, bdiropq; |
027c5e7a AM |
8535 | + struct au_hdentry tmp, *p, *q; |
8536 | + struct au_dinfo *dinfo; | |
8537 | + struct super_block *sb; | |
1facf9fc | 8538 | + |
027c5e7a | 8539 | + DiMustWriteLock(dentry); |
1308ab2a | 8540 | + |
027c5e7a AM |
8541 | + sb = dentry->d_sb; |
8542 | + dinfo = au_di(dentry); | |
5afbbe0d | 8543 | + bbot = dinfo->di_bbot; |
1facf9fc | 8544 | + bwh = dinfo->di_bwh; |
8545 | + bdiropq = dinfo->di_bdiropq; | |
5afbbe0d AM |
8546 | + bindex = dinfo->di_btop; |
8547 | + p = au_hdentry(dinfo, bindex); | |
8548 | + for (; bindex <= bbot; bindex++, p++) { | |
027c5e7a | 8549 | + if (!p->hd_dentry) |
1facf9fc | 8550 | + continue; |
8551 | + | |
027c5e7a AM |
8552 | + new_bindex = au_br_index(sb, p->hd_id); |
8553 | + if (new_bindex == bindex) | |
1facf9fc | 8554 | + continue; |
1facf9fc | 8555 | + |
1facf9fc | 8556 | + if (dinfo->di_bwh == bindex) |
8557 | + bwh = new_bindex; | |
8558 | + if (dinfo->di_bdiropq == bindex) | |
8559 | + bdiropq = new_bindex; | |
8560 | + if (new_bindex < 0) { | |
8561 | + au_hdput(p); | |
8562 | + p->hd_dentry = NULL; | |
8563 | + continue; | |
8564 | + } | |
8565 | + | |
8566 | + /* swap two lower dentries, and loop again */ | |
5afbbe0d | 8567 | + q = au_hdentry(dinfo, new_bindex); |
1facf9fc | 8568 | + tmp = *q; |
8569 | + *q = *p; | |
8570 | + *p = tmp; | |
8571 | + if (tmp.hd_dentry) { | |
8572 | + bindex--; | |
8573 | + p--; | |
8574 | + } | |
8575 | + } | |
8576 | + | |
1facf9fc | 8577 | + dinfo->di_bwh = -1; |
5afbbe0d | 8578 | + if (bwh >= 0 && bwh <= au_sbbot(sb) && au_sbr_whable(sb, bwh)) |
1facf9fc | 8579 | + dinfo->di_bwh = bwh; |
8580 | + | |
8581 | + dinfo->di_bdiropq = -1; | |
8582 | + if (bdiropq >= 0 | |
5afbbe0d | 8583 | + && bdiropq <= au_sbbot(sb) |
1facf9fc | 8584 | + && au_sbr_whable(sb, bdiropq)) |
8585 | + dinfo->di_bdiropq = bdiropq; | |
8586 | + | |
027c5e7a | 8587 | + err = -EIO; |
5afbbe0d AM |
8588 | + dinfo->di_btop = -1; |
8589 | + dinfo->di_bbot = -1; | |
8590 | + bbot = au_dbbot(parent); | |
8591 | + bindex = 0; | |
8592 | + p = au_hdentry(dinfo, bindex); | |
8593 | + for (; bindex <= bbot; bindex++, p++) | |
1facf9fc | 8594 | + if (p->hd_dentry) { |
5afbbe0d | 8595 | + dinfo->di_btop = bindex; |
1facf9fc | 8596 | + break; |
8597 | + } | |
8598 | + | |
5afbbe0d AM |
8599 | + if (dinfo->di_btop >= 0) { |
8600 | + bindex = bbot; | |
8601 | + p = au_hdentry(dinfo, bindex); | |
8602 | + for (; bindex >= 0; bindex--, p--) | |
027c5e7a | 8603 | + if (p->hd_dentry) { |
5afbbe0d | 8604 | + dinfo->di_bbot = bindex; |
027c5e7a AM |
8605 | + err = 0; |
8606 | + break; | |
8607 | + } | |
8608 | + } | |
8609 | + | |
8610 | + return err; | |
1facf9fc | 8611 | +} |
8612 | + | |
027c5e7a | 8613 | +static void au_do_hide(struct dentry *dentry) |
1facf9fc | 8614 | +{ |
027c5e7a | 8615 | + struct inode *inode; |
1facf9fc | 8616 | + |
5527c038 JR |
8617 | + if (d_really_is_positive(dentry)) { |
8618 | + inode = d_inode(dentry); | |
8619 | + if (!d_is_dir(dentry)) { | |
027c5e7a AM |
8620 | + if (inode->i_nlink && !d_unhashed(dentry)) |
8621 | + drop_nlink(inode); | |
8622 | + } else { | |
8623 | + clear_nlink(inode); | |
8624 | + /* stop next lookup */ | |
8625 | + inode->i_flags |= S_DEAD; | |
8626 | + } | |
8627 | + smp_mb(); /* necessary? */ | |
8628 | + } | |
8629 | + d_drop(dentry); | |
8630 | +} | |
1308ab2a | 8631 | + |
027c5e7a AM |
8632 | +static int au_hide_children(struct dentry *parent) |
8633 | +{ | |
8634 | + int err, i, j, ndentry; | |
8635 | + struct au_dcsub_pages dpages; | |
8636 | + struct au_dpage *dpage; | |
8637 | + struct dentry *dentry; | |
1facf9fc | 8638 | + |
027c5e7a | 8639 | + err = au_dpages_init(&dpages, GFP_NOFS); |
1facf9fc | 8640 | + if (unlikely(err)) |
8641 | + goto out; | |
027c5e7a AM |
8642 | + err = au_dcsub_pages(&dpages, parent, NULL, NULL); |
8643 | + if (unlikely(err)) | |
8644 | + goto out_dpages; | |
1facf9fc | 8645 | + |
027c5e7a AM |
8646 | + /* in reverse order */ |
8647 | + for (i = dpages.ndpage - 1; i >= 0; i--) { | |
8648 | + dpage = dpages.dpages + i; | |
8649 | + ndentry = dpage->ndentry; | |
8650 | + for (j = ndentry - 1; j >= 0; j--) { | |
8651 | + dentry = dpage->dentries[j]; | |
8652 | + if (dentry != parent) | |
8653 | + au_do_hide(dentry); | |
8654 | + } | |
8655 | + } | |
1facf9fc | 8656 | + |
027c5e7a AM |
8657 | +out_dpages: |
8658 | + au_dpages_free(&dpages); | |
4f0767ce | 8659 | +out: |
027c5e7a | 8660 | + return err; |
1facf9fc | 8661 | +} |
8662 | + | |
027c5e7a | 8663 | +static void au_hide(struct dentry *dentry) |
1facf9fc | 8664 | +{ |
027c5e7a | 8665 | + int err; |
1facf9fc | 8666 | + |
027c5e7a | 8667 | + AuDbgDentry(dentry); |
2000de60 | 8668 | + if (d_is_dir(dentry)) { |
027c5e7a AM |
8669 | + /* shrink_dcache_parent(dentry); */ |
8670 | + err = au_hide_children(dentry); | |
8671 | + if (unlikely(err)) | |
523b37e3 AM |
8672 | + AuIOErr("%pd, failed hiding children, ignored %d\n", |
8673 | + dentry, err); | |
027c5e7a AM |
8674 | + } |
8675 | + au_do_hide(dentry); | |
8676 | +} | |
1facf9fc | 8677 | + |
027c5e7a AM |
8678 | +/* |
8679 | + * By adding a dirty branch, a cached dentry may be affected in various ways. | |
8680 | + * | |
8681 | + * a dirty branch is added | |
8682 | + * - on the top of layers | |
8683 | + * - in the middle of layers | |
8684 | + * - to the bottom of layers | |
8685 | + * | |
8686 | + * on the added branch there exists | |
8687 | + * - a whiteout | |
8688 | + * - a diropq | |
8689 | + * - a same named entry | |
8690 | + * + exist | |
8691 | + * * negative --> positive | |
8692 | + * * positive --> positive | |
8693 | + * - type is unchanged | |
8694 | + * - type is changed | |
8695 | + * + doesn't exist | |
8696 | + * * negative --> negative | |
8697 | + * * positive --> negative (rejected by au_br_del() for non-dir case) | |
8698 | + * - none | |
8699 | + */ | |
8700 | +static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo, | |
8701 | + struct au_dinfo *tmp) | |
8702 | +{ | |
8703 | + int err; | |
5afbbe0d | 8704 | + aufs_bindex_t bindex, bbot; |
027c5e7a AM |
8705 | + struct { |
8706 | + struct dentry *dentry; | |
8707 | + struct inode *inode; | |
8708 | + mode_t mode; | |
be52b249 AM |
8709 | + } orig_h, tmp_h = { |
8710 | + .dentry = NULL | |
8711 | + }; | |
027c5e7a AM |
8712 | + struct au_hdentry *hd; |
8713 | + struct inode *inode, *h_inode; | |
8714 | + struct dentry *h_dentry; | |
8715 | + | |
8716 | + err = 0; | |
5afbbe0d | 8717 | + AuDebugOn(dinfo->di_btop < 0); |
027c5e7a | 8718 | + orig_h.mode = 0; |
5afbbe0d | 8719 | + orig_h.dentry = au_hdentry(dinfo, dinfo->di_btop)->hd_dentry; |
5527c038 JR |
8720 | + orig_h.inode = NULL; |
8721 | + if (d_is_positive(orig_h.dentry)) { | |
8722 | + orig_h.inode = d_inode(orig_h.dentry); | |
027c5e7a | 8723 | + orig_h.mode = orig_h.inode->i_mode & S_IFMT; |
5527c038 | 8724 | + } |
5afbbe0d AM |
8725 | + if (tmp->di_btop >= 0) { |
8726 | + tmp_h.dentry = au_hdentry(tmp, tmp->di_btop)->hd_dentry; | |
5527c038 JR |
8727 | + if (d_is_positive(tmp_h.dentry)) { |
8728 | + tmp_h.inode = d_inode(tmp_h.dentry); | |
027c5e7a | 8729 | + tmp_h.mode = tmp_h.inode->i_mode & S_IFMT; |
5527c038 | 8730 | + } |
027c5e7a AM |
8731 | + } |
8732 | + | |
5527c038 JR |
8733 | + inode = NULL; |
8734 | + if (d_really_is_positive(dentry)) | |
8735 | + inode = d_inode(dentry); | |
027c5e7a AM |
8736 | + if (!orig_h.inode) { |
8737 | + AuDbg("nagative originally\n"); | |
8738 | + if (inode) { | |
8739 | + au_hide(dentry); | |
8740 | + goto out; | |
8741 | + } | |
8742 | + AuDebugOn(inode); | |
5afbbe0d | 8743 | + AuDebugOn(dinfo->di_btop != dinfo->di_bbot); |
027c5e7a AM |
8744 | + AuDebugOn(dinfo->di_bdiropq != -1); |
8745 | + | |
8746 | + if (!tmp_h.inode) { | |
8747 | + AuDbg("negative --> negative\n"); | |
8748 | + /* should have only one negative lower */ | |
5afbbe0d AM |
8749 | + if (tmp->di_btop >= 0 |
8750 | + && tmp->di_btop < dinfo->di_btop) { | |
8751 | + AuDebugOn(tmp->di_btop != tmp->di_bbot); | |
8752 | + AuDebugOn(dinfo->di_btop != dinfo->di_bbot); | |
8753 | + au_set_h_dptr(dentry, dinfo->di_btop, NULL); | |
027c5e7a | 8754 | + au_di_cp(dinfo, tmp); |
5afbbe0d AM |
8755 | + hd = au_hdentry(tmp, tmp->di_btop); |
8756 | + au_set_h_dptr(dentry, tmp->di_btop, | |
027c5e7a AM |
8757 | + dget(hd->hd_dentry)); |
8758 | + } | |
8759 | + au_dbg_verify_dinode(dentry); | |
8760 | + } else { | |
8761 | + AuDbg("negative --> positive\n"); | |
8762 | + /* | |
8763 | + * similar to the behaviour of creating with bypassing | |
8764 | + * aufs. | |
8765 | + * unhash it in order to force an error in the | |
8766 | + * succeeding create operation. | |
8767 | + * we should not set S_DEAD here. | |
8768 | + */ | |
8769 | + d_drop(dentry); | |
8770 | + /* au_di_swap(tmp, dinfo); */ | |
8771 | + au_dbg_verify_dinode(dentry); | |
8772 | + } | |
8773 | + } else { | |
8774 | + AuDbg("positive originally\n"); | |
8775 | + /* inode may be NULL */ | |
8776 | + AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode); | |
8777 | + if (!tmp_h.inode) { | |
8778 | + AuDbg("positive --> negative\n"); | |
8779 | + /* or bypassing aufs */ | |
8780 | + au_hide(dentry); | |
5afbbe0d | 8781 | + if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_btop) |
027c5e7a AM |
8782 | + dinfo->di_bwh = tmp->di_bwh; |
8783 | + if (inode) | |
8784 | + err = au_refresh_hinode_self(inode); | |
8785 | + au_dbg_verify_dinode(dentry); | |
8786 | + } else if (orig_h.mode == tmp_h.mode) { | |
8787 | + AuDbg("positive --> positive, same type\n"); | |
8788 | + if (!S_ISDIR(orig_h.mode) | |
5afbbe0d | 8789 | + && dinfo->di_btop > tmp->di_btop) { |
027c5e7a AM |
8790 | + /* |
8791 | + * similar to the behaviour of removing and | |
8792 | + * creating. | |
8793 | + */ | |
8794 | + au_hide(dentry); | |
8795 | + if (inode) | |
8796 | + err = au_refresh_hinode_self(inode); | |
8797 | + au_dbg_verify_dinode(dentry); | |
8798 | + } else { | |
8799 | + /* fill empty slots */ | |
5afbbe0d AM |
8800 | + if (dinfo->di_btop > tmp->di_btop) |
8801 | + dinfo->di_btop = tmp->di_btop; | |
8802 | + if (dinfo->di_bbot < tmp->di_bbot) | |
8803 | + dinfo->di_bbot = tmp->di_bbot; | |
027c5e7a AM |
8804 | + dinfo->di_bwh = tmp->di_bwh; |
8805 | + dinfo->di_bdiropq = tmp->di_bdiropq; | |
5afbbe0d AM |
8806 | + bbot = dinfo->di_bbot; |
8807 | + bindex = tmp->di_btop; | |
8808 | + hd = au_hdentry(tmp, bindex); | |
8809 | + for (; bindex <= bbot; bindex++, hd++) { | |
027c5e7a AM |
8810 | + if (au_h_dptr(dentry, bindex)) |
8811 | + continue; | |
5afbbe0d | 8812 | + h_dentry = hd->hd_dentry; |
027c5e7a AM |
8813 | + if (!h_dentry) |
8814 | + continue; | |
5527c038 JR |
8815 | + AuDebugOn(d_is_negative(h_dentry)); |
8816 | + h_inode = d_inode(h_dentry); | |
027c5e7a AM |
8817 | + AuDebugOn(orig_h.mode |
8818 | + != (h_inode->i_mode | |
8819 | + & S_IFMT)); | |
8820 | + au_set_h_dptr(dentry, bindex, | |
8821 | + dget(h_dentry)); | |
8822 | + } | |
5afbbe0d AM |
8823 | + if (inode) |
8824 | + err = au_refresh_hinode(inode, dentry); | |
027c5e7a AM |
8825 | + au_dbg_verify_dinode(dentry); |
8826 | + } | |
8827 | + } else { | |
8828 | + AuDbg("positive --> positive, different type\n"); | |
8829 | + /* similar to the behaviour of removing and creating */ | |
8830 | + au_hide(dentry); | |
8831 | + if (inode) | |
8832 | + err = au_refresh_hinode_self(inode); | |
8833 | + au_dbg_verify_dinode(dentry); | |
8834 | + } | |
8835 | + } | |
8836 | + | |
8837 | +out: | |
8838 | + return err; | |
8839 | +} | |
8840 | + | |
79b8bda9 AM |
8841 | +void au_refresh_dop(struct dentry *dentry, int force_reval) |
8842 | +{ | |
8843 | + const struct dentry_operations *dop | |
8844 | + = force_reval ? &aufs_dop : dentry->d_sb->s_d_op; | |
8845 | + static const unsigned int mask | |
8846 | + = DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE; | |
8847 | + | |
8848 | + BUILD_BUG_ON(sizeof(mask) != sizeof(dentry->d_flags)); | |
8849 | + | |
8850 | + if (dentry->d_op == dop) | |
8851 | + return; | |
8852 | + | |
8853 | + AuDbg("%pd\n", dentry); | |
8854 | + spin_lock(&dentry->d_lock); | |
8855 | + if (dop == &aufs_dop) | |
8856 | + dentry->d_flags |= mask; | |
8857 | + else | |
8858 | + dentry->d_flags &= ~mask; | |
8859 | + dentry->d_op = dop; | |
8860 | + spin_unlock(&dentry->d_lock); | |
8861 | +} | |
8862 | + | |
027c5e7a AM |
8863 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent) |
8864 | +{ | |
e2f27e51 | 8865 | + int err, ebrange, nbr; |
027c5e7a AM |
8866 | + unsigned int sigen; |
8867 | + struct au_dinfo *dinfo, *tmp; | |
8868 | + struct super_block *sb; | |
8869 | + struct inode *inode; | |
8870 | + | |
8871 | + DiMustWriteLock(dentry); | |
8872 | + AuDebugOn(IS_ROOT(dentry)); | |
5527c038 | 8873 | + AuDebugOn(d_really_is_negative(parent)); |
027c5e7a AM |
8874 | + |
8875 | + sb = dentry->d_sb; | |
027c5e7a AM |
8876 | + sigen = au_sigen(sb); |
8877 | + err = au_digen_test(parent, sigen); | |
8878 | + if (unlikely(err)) | |
8879 | + goto out; | |
8880 | + | |
e2f27e51 | 8881 | + nbr = au_sbbot(sb) + 1; |
027c5e7a | 8882 | + dinfo = au_di(dentry); |
e2f27e51 | 8883 | + err = au_di_realloc(dinfo, nbr, /*may_shrink*/0); |
027c5e7a AM |
8884 | + if (unlikely(err)) |
8885 | + goto out; | |
8886 | + ebrange = au_dbrange_test(dentry); | |
8887 | + if (!ebrange) | |
8888 | + ebrange = au_do_refresh_hdentry(dentry, parent); | |
8889 | + | |
38d290e6 | 8890 | + if (d_unhashed(dentry) || ebrange /* || dinfo->di_tmpfile */) { |
5afbbe0d | 8891 | + AuDebugOn(au_dbtop(dentry) < 0 && au_dbbot(dentry) >= 0); |
5527c038 JR |
8892 | + if (d_really_is_positive(dentry)) { |
8893 | + inode = d_inode(dentry); | |
027c5e7a | 8894 | + err = au_refresh_hinode_self(inode); |
5527c038 | 8895 | + } |
027c5e7a AM |
8896 | + au_dbg_verify_dinode(dentry); |
8897 | + if (!err) | |
8898 | + goto out_dgen; /* success */ | |
8899 | + goto out; | |
8900 | + } | |
8901 | + | |
8902 | + /* temporary dinfo */ | |
8903 | + AuDbgDentry(dentry); | |
8904 | + err = -ENOMEM; | |
8905 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
8906 | + if (unlikely(!tmp)) | |
8907 | + goto out; | |
8908 | + au_di_swap(tmp, dinfo); | |
8909 | + /* returns the number of positive dentries */ | |
8910 | + /* | |
8911 | + * if current working dir is removed, it returns an error. | |
8912 | + * but the dentry is legal. | |
8913 | + */ | |
5afbbe0d | 8914 | + err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); |
027c5e7a AM |
8915 | + AuDbgDentry(dentry); |
8916 | + au_di_swap(tmp, dinfo); | |
8917 | + if (err == -ENOENT) | |
8918 | + err = 0; | |
8919 | + if (err >= 0) { | |
8920 | + /* compare/refresh by dinfo */ | |
8921 | + AuDbgDentry(dentry); | |
8922 | + err = au_refresh_by_dinfo(dentry, dinfo, tmp); | |
8923 | + au_dbg_verify_dinode(dentry); | |
8924 | + AuTraceErr(err); | |
8925 | + } | |
e2f27e51 | 8926 | + au_di_realloc(dinfo, nbr, /*may_shrink*/1); /* harmless if err */ |
027c5e7a AM |
8927 | + au_rw_write_unlock(&tmp->di_rwsem); |
8928 | + au_di_free(tmp); | |
8929 | + if (unlikely(err)) | |
8930 | + goto out; | |
8931 | + | |
8932 | +out_dgen: | |
8933 | + au_update_digen(dentry); | |
8934 | +out: | |
8935 | + if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) { | |
523b37e3 | 8936 | + AuIOErr("failed refreshing %pd, %d\n", dentry, err); |
027c5e7a AM |
8937 | + AuDbgDentry(dentry); |
8938 | + } | |
8939 | + AuTraceErr(err); | |
8940 | + return err; | |
8941 | +} | |
8942 | + | |
b4510431 AM |
8943 | +static int au_do_h_d_reval(struct dentry *h_dentry, unsigned int flags, |
8944 | + struct dentry *dentry, aufs_bindex_t bindex) | |
027c5e7a AM |
8945 | +{ |
8946 | + int err, valid; | |
027c5e7a AM |
8947 | + |
8948 | + err = 0; | |
8949 | + if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE)) | |
8950 | + goto out; | |
027c5e7a AM |
8951 | + |
8952 | + AuDbg("b%d\n", bindex); | |
b4510431 AM |
8953 | + /* |
8954 | + * gave up supporting LOOKUP_CREATE/OPEN for lower fs, | |
8955 | + * due to whiteout and branch permission. | |
8956 | + */ | |
8957 | + flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE | |
8958 | + | LOOKUP_FOLLOW | LOOKUP_EXCL); | |
8959 | + /* it may return tri-state */ | |
8960 | + valid = h_dentry->d_op->d_revalidate(h_dentry, flags); | |
1facf9fc | 8961 | + |
8962 | + if (unlikely(valid < 0)) | |
8963 | + err = valid; | |
8964 | + else if (!valid) | |
8965 | + err = -EINVAL; | |
8966 | + | |
4f0767ce | 8967 | +out: |
1facf9fc | 8968 | + AuTraceErr(err); |
8969 | + return err; | |
8970 | +} | |
8971 | + | |
8972 | +/* todo: remove this */ | |
8973 | +static int h_d_revalidate(struct dentry *dentry, struct inode *inode, | |
8b6a4947 | 8974 | + unsigned int flags, int do_udba, int dirren) |
1facf9fc | 8975 | +{ |
8976 | + int err; | |
8977 | + umode_t mode, h_mode; | |
5afbbe0d | 8978 | + aufs_bindex_t bindex, btail, btop, ibs, ibe; |
38d290e6 | 8979 | + unsigned char plus, unhashed, is_root, h_plus, h_nfs, tmpfile; |
4a4d8108 | 8980 | + struct inode *h_inode, *h_cached_inode; |
1facf9fc | 8981 | + struct dentry *h_dentry; |
8982 | + struct qstr *name, *h_name; | |
8983 | + | |
8984 | + err = 0; | |
8985 | + plus = 0; | |
8986 | + mode = 0; | |
1facf9fc | 8987 | + ibs = -1; |
8988 | + ibe = -1; | |
8989 | + unhashed = !!d_unhashed(dentry); | |
8990 | + is_root = !!IS_ROOT(dentry); | |
8991 | + name = &dentry->d_name; | |
38d290e6 | 8992 | + tmpfile = au_di(dentry)->di_tmpfile; |
1facf9fc | 8993 | + |
8994 | + /* | |
7f207e10 AM |
8995 | + * Theoretically, REVAL test should be unnecessary in case of |
8996 | + * {FS,I}NOTIFY. | |
8997 | + * But {fs,i}notify doesn't fire some necessary events, | |
1facf9fc | 8998 | + * IN_ATTRIB for atime/nlink/pageio |
1facf9fc | 8999 | + * Let's do REVAL test too. |
9000 | + */ | |
9001 | + if (do_udba && inode) { | |
9002 | + mode = (inode->i_mode & S_IFMT); | |
9003 | + plus = (inode->i_nlink > 0); | |
5afbbe0d AM |
9004 | + ibs = au_ibtop(inode); |
9005 | + ibe = au_ibbot(inode); | |
1facf9fc | 9006 | + } |
9007 | + | |
5afbbe0d AM |
9008 | + btop = au_dbtop(dentry); |
9009 | + btail = btop; | |
1facf9fc | 9010 | + if (inode && S_ISDIR(inode->i_mode)) |
9011 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 9012 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 9013 | + h_dentry = au_h_dptr(dentry, bindex); |
9014 | + if (!h_dentry) | |
9015 | + continue; | |
9016 | + | |
523b37e3 AM |
9017 | + AuDbg("b%d, %pd\n", bindex, h_dentry); |
9018 | + h_nfs = !!au_test_nfs(h_dentry->d_sb); | |
027c5e7a | 9019 | + spin_lock(&h_dentry->d_lock); |
1facf9fc | 9020 | + h_name = &h_dentry->d_name; |
9021 | + if (unlikely(do_udba | |
9022 | + && !is_root | |
523b37e3 AM |
9023 | + && ((!h_nfs |
9024 | + && (unhashed != !!d_unhashed(h_dentry) | |
8b6a4947 | 9025 | + || (!tmpfile && !dirren |
38d290e6 JR |
9026 | + && !au_qstreq(name, h_name)) |
9027 | + )) | |
523b37e3 AM |
9028 | + || (h_nfs |
9029 | + && !(flags & LOOKUP_OPEN) | |
9030 | + && (h_dentry->d_flags | |
9031 | + & DCACHE_NFSFS_RENAMED))) | |
1facf9fc | 9032 | + )) { |
38d290e6 JR |
9033 | + int h_unhashed; |
9034 | + | |
9035 | + h_unhashed = d_unhashed(h_dentry); | |
027c5e7a | 9036 | + spin_unlock(&h_dentry->d_lock); |
38d290e6 JR |
9037 | + AuDbg("unhash 0x%x 0x%x, %pd %pd\n", |
9038 | + unhashed, h_unhashed, dentry, h_dentry); | |
1facf9fc | 9039 | + goto err; |
9040 | + } | |
027c5e7a | 9041 | + spin_unlock(&h_dentry->d_lock); |
1facf9fc | 9042 | + |
b4510431 | 9043 | + err = au_do_h_d_reval(h_dentry, flags, dentry, bindex); |
1facf9fc | 9044 | + if (unlikely(err)) |
9045 | + /* do not goto err, to keep the errno */ | |
9046 | + break; | |
9047 | + | |
9048 | + /* todo: plink too? */ | |
9049 | + if (!do_udba) | |
9050 | + continue; | |
9051 | + | |
9052 | + /* UDBA tests */ | |
5527c038 | 9053 | + if (unlikely(!!inode != d_is_positive(h_dentry))) |
1facf9fc | 9054 | + goto err; |
9055 | + | |
5527c038 JR |
9056 | + h_inode = NULL; |
9057 | + if (d_is_positive(h_dentry)) | |
9058 | + h_inode = d_inode(h_dentry); | |
1facf9fc | 9059 | + h_plus = plus; |
9060 | + h_mode = mode; | |
9061 | + h_cached_inode = h_inode; | |
9062 | + if (h_inode) { | |
9063 | + h_mode = (h_inode->i_mode & S_IFMT); | |
9064 | + h_plus = (h_inode->i_nlink > 0); | |
9065 | + } | |
9066 | + if (inode && ibs <= bindex && bindex <= ibe) | |
9067 | + h_cached_inode = au_h_iptr(inode, bindex); | |
9068 | + | |
523b37e3 | 9069 | + if (!h_nfs) { |
38d290e6 | 9070 | + if (unlikely(plus != h_plus && !tmpfile)) |
523b37e3 AM |
9071 | + goto err; |
9072 | + } else { | |
9073 | + if (unlikely(!(h_dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
9074 | + && !is_root | |
9075 | + && !IS_ROOT(h_dentry) | |
9076 | + && unhashed != d_unhashed(h_dentry))) | |
9077 | + goto err; | |
9078 | + } | |
9079 | + if (unlikely(mode != h_mode | |
1facf9fc | 9080 | + || h_cached_inode != h_inode)) |
9081 | + goto err; | |
9082 | + continue; | |
9083 | + | |
f6b6e03d | 9084 | +err: |
1facf9fc | 9085 | + err = -EINVAL; |
9086 | + break; | |
9087 | + } | |
9088 | + | |
523b37e3 | 9089 | + AuTraceErr(err); |
1facf9fc | 9090 | + return err; |
9091 | +} | |
9092 | + | |
027c5e7a | 9093 | +/* todo: consolidate with do_refresh() and au_reval_for_attr() */ |
1facf9fc | 9094 | +static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen) |
9095 | +{ | |
9096 | + int err; | |
9097 | + struct dentry *parent; | |
1facf9fc | 9098 | + |
027c5e7a | 9099 | + if (!au_digen_test(dentry, sigen)) |
1facf9fc | 9100 | + return 0; |
9101 | + | |
9102 | + parent = dget_parent(dentry); | |
9103 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 9104 | + AuDebugOn(au_digen_test(parent, sigen)); |
1facf9fc | 9105 | + au_dbg_verify_gen(parent, sigen); |
027c5e7a | 9106 | + err = au_refresh_dentry(dentry, parent); |
1facf9fc | 9107 | + di_read_unlock(parent, AuLock_IR); |
9108 | + dput(parent); | |
027c5e7a | 9109 | + AuTraceErr(err); |
1facf9fc | 9110 | + return err; |
9111 | +} | |
9112 | + | |
9113 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen) | |
9114 | +{ | |
9115 | + int err; | |
9116 | + struct dentry *d, *parent; | |
1facf9fc | 9117 | + |
027c5e7a | 9118 | + if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR)) |
1facf9fc | 9119 | + return simple_reval_dpath(dentry, sigen); |
9120 | + | |
9121 | + /* slow loop, keep it simple and stupid */ | |
9122 | + /* cf: au_cpup_dirs() */ | |
9123 | + err = 0; | |
9124 | + parent = NULL; | |
027c5e7a | 9125 | + while (au_digen_test(dentry, sigen)) { |
1facf9fc | 9126 | + d = dentry; |
9127 | + while (1) { | |
9128 | + dput(parent); | |
9129 | + parent = dget_parent(d); | |
027c5e7a | 9130 | + if (!au_digen_test(parent, sigen)) |
1facf9fc | 9131 | + break; |
9132 | + d = parent; | |
9133 | + } | |
9134 | + | |
1facf9fc | 9135 | + if (d != dentry) |
027c5e7a | 9136 | + di_write_lock_child2(d); |
1facf9fc | 9137 | + |
9138 | + /* someone might update our dentry while we were sleeping */ | |
027c5e7a AM |
9139 | + if (au_digen_test(d, sigen)) { |
9140 | + /* | |
9141 | + * todo: consolidate with simple_reval_dpath(), | |
9142 | + * do_refresh() and au_reval_for_attr(). | |
9143 | + */ | |
1facf9fc | 9144 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a | 9145 | + err = au_refresh_dentry(d, parent); |
1facf9fc | 9146 | + di_read_unlock(parent, AuLock_IR); |
9147 | + } | |
9148 | + | |
9149 | + if (d != dentry) | |
9150 | + di_write_unlock(d); | |
9151 | + dput(parent); | |
9152 | + if (unlikely(err)) | |
9153 | + break; | |
9154 | + } | |
9155 | + | |
9156 | + return err; | |
9157 | +} | |
9158 | + | |
9159 | +/* | |
9160 | + * if valid returns 1, otherwise 0. | |
9161 | + */ | |
b4510431 | 9162 | +static int aufs_d_revalidate(struct dentry *dentry, unsigned int flags) |
1facf9fc | 9163 | +{ |
9164 | + int valid, err; | |
9165 | + unsigned int sigen; | |
8b6a4947 | 9166 | + unsigned char do_udba, dirren; |
1facf9fc | 9167 | + struct super_block *sb; |
9168 | + struct inode *inode; | |
9169 | + | |
027c5e7a | 9170 | + /* todo: support rcu-walk? */ |
b4510431 | 9171 | + if (flags & LOOKUP_RCU) |
027c5e7a AM |
9172 | + return -ECHILD; |
9173 | + | |
9174 | + valid = 0; | |
9175 | + if (unlikely(!au_di(dentry))) | |
9176 | + goto out; | |
9177 | + | |
e49829fe | 9178 | + valid = 1; |
1facf9fc | 9179 | + sb = dentry->d_sb; |
e49829fe JR |
9180 | + /* |
9181 | + * todo: very ugly | |
9182 | + * i_mutex of parent dir may be held, | |
9183 | + * but we should not return 'invalid' due to busy. | |
9184 | + */ | |
9185 | + err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM); | |
9186 | + if (unlikely(err)) { | |
9187 | + valid = err; | |
027c5e7a | 9188 | + AuTraceErr(err); |
e49829fe JR |
9189 | + goto out; |
9190 | + } | |
5527c038 JR |
9191 | + inode = NULL; |
9192 | + if (d_really_is_positive(dentry)) | |
9193 | + inode = d_inode(dentry); | |
5afbbe0d | 9194 | + if (unlikely(inode && au_is_bad_inode(inode))) { |
c1595e42 JR |
9195 | + err = -EINVAL; |
9196 | + AuTraceErr(err); | |
9197 | + goto out_dgrade; | |
9198 | + } | |
027c5e7a AM |
9199 | + if (unlikely(au_dbrange_test(dentry))) { |
9200 | + err = -EINVAL; | |
9201 | + AuTraceErr(err); | |
9202 | + goto out_dgrade; | |
1facf9fc | 9203 | + } |
027c5e7a AM |
9204 | + |
9205 | + sigen = au_sigen(sb); | |
9206 | + if (au_digen_test(dentry, sigen)) { | |
1facf9fc | 9207 | + AuDebugOn(IS_ROOT(dentry)); |
027c5e7a AM |
9208 | + err = au_reval_dpath(dentry, sigen); |
9209 | + if (unlikely(err)) { | |
9210 | + AuTraceErr(err); | |
1facf9fc | 9211 | + goto out_dgrade; |
027c5e7a | 9212 | + } |
1facf9fc | 9213 | + } |
9214 | + di_downgrade_lock(dentry, AuLock_IR); | |
9215 | + | |
1facf9fc | 9216 | + err = -EINVAL; |
c1595e42 | 9217 | + if (!(flags & (LOOKUP_OPEN | LOOKUP_EMPTY)) |
523b37e3 | 9218 | + && inode |
38d290e6 | 9219 | + && !(inode->i_state && I_LINKABLE) |
79b8bda9 AM |
9220 | + && (IS_DEADDIR(inode) || !inode->i_nlink)) { |
9221 | + AuTraceErr(err); | |
027c5e7a | 9222 | + goto out_inval; |
79b8bda9 | 9223 | + } |
027c5e7a | 9224 | + |
1facf9fc | 9225 | + do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE); |
9226 | + if (do_udba && inode) { | |
5afbbe0d | 9227 | + aufs_bindex_t btop = au_ibtop(inode); |
027c5e7a | 9228 | + struct inode *h_inode; |
1facf9fc | 9229 | + |
5afbbe0d AM |
9230 | + if (btop >= 0) { |
9231 | + h_inode = au_h_iptr(inode, btop); | |
79b8bda9 AM |
9232 | + if (h_inode && au_test_higen(inode, h_inode)) { |
9233 | + AuTraceErr(err); | |
027c5e7a | 9234 | + goto out_inval; |
79b8bda9 | 9235 | + } |
027c5e7a | 9236 | + } |
1facf9fc | 9237 | + } |
9238 | + | |
8b6a4947 AM |
9239 | + dirren = !!au_opt_test(au_mntflags(sb), DIRREN); |
9240 | + err = h_d_revalidate(dentry, inode, flags, do_udba, dirren); | |
5afbbe0d | 9241 | + if (unlikely(!err && do_udba && au_dbtop(dentry) < 0)) { |
1facf9fc | 9242 | + err = -EIO; |
523b37e3 AM |
9243 | + AuDbg("both of real entry and whiteout found, %p, err %d\n", |
9244 | + dentry, err); | |
027c5e7a | 9245 | + } |
e49829fe | 9246 | + goto out_inval; |
1facf9fc | 9247 | + |
4f0767ce | 9248 | +out_dgrade: |
1facf9fc | 9249 | + di_downgrade_lock(dentry, AuLock_IR); |
e49829fe | 9250 | +out_inval: |
1facf9fc | 9251 | + aufs_read_unlock(dentry, AuLock_IR); |
9252 | + AuTraceErr(err); | |
9253 | + valid = !err; | |
e49829fe | 9254 | +out: |
027c5e7a | 9255 | + if (!valid) { |
523b37e3 | 9256 | + AuDbg("%pd invalid, %d\n", dentry, valid); |
027c5e7a AM |
9257 | + d_drop(dentry); |
9258 | + } | |
1facf9fc | 9259 | + return valid; |
9260 | +} | |
9261 | + | |
9262 | +static void aufs_d_release(struct dentry *dentry) | |
9263 | +{ | |
027c5e7a | 9264 | + if (au_di(dentry)) { |
4a4d8108 AM |
9265 | + au_di_fin(dentry); |
9266 | + au_hn_di_reinit(dentry); | |
1facf9fc | 9267 | + } |
1facf9fc | 9268 | +} |
9269 | + | |
4a4d8108 | 9270 | +const struct dentry_operations aufs_dop = { |
c06a8ce3 AM |
9271 | + .d_revalidate = aufs_d_revalidate, |
9272 | + .d_weak_revalidate = aufs_d_revalidate, | |
9273 | + .d_release = aufs_d_release | |
1facf9fc | 9274 | +}; |
79b8bda9 AM |
9275 | + |
9276 | +/* aufs_dop without d_revalidate */ | |
9277 | +const struct dentry_operations aufs_dop_noreval = { | |
9278 | + .d_release = aufs_d_release | |
9279 | +}; | |
7f207e10 AM |
9280 | diff -urN /usr/share/empty/fs/aufs/dentry.h linux/fs/aufs/dentry.h |
9281 | --- /usr/share/empty/fs/aufs/dentry.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 9282 | +++ linux/fs/aufs/dentry.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
9283 | @@ -0,0 +1,267 @@ |
9284 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 9285 | +/* |
b00004a5 | 9286 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 9287 | + * |
9288 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9289 | + * it under the terms of the GNU General Public License as published by | |
9290 | + * the Free Software Foundation; either version 2 of the License, or | |
9291 | + * (at your option) any later version. | |
dece6358 AM |
9292 | + * |
9293 | + * This program is distributed in the hope that it will be useful, | |
9294 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9295 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9296 | + * GNU General Public License for more details. | |
9297 | + * | |
9298 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 9299 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 9300 | + */ |
9301 | + | |
9302 | +/* | |
9303 | + * lookup and dentry operations | |
9304 | + */ | |
9305 | + | |
9306 | +#ifndef __AUFS_DENTRY_H__ | |
9307 | +#define __AUFS_DENTRY_H__ | |
9308 | + | |
9309 | +#ifdef __KERNEL__ | |
9310 | + | |
dece6358 | 9311 | +#include <linux/dcache.h> |
8b6a4947 | 9312 | +#include "dirren.h" |
1facf9fc | 9313 | +#include "rwsem.h" |
9314 | + | |
1facf9fc | 9315 | +struct au_hdentry { |
9316 | + struct dentry *hd_dentry; | |
027c5e7a | 9317 | + aufs_bindex_t hd_id; |
1facf9fc | 9318 | +}; |
9319 | + | |
9320 | +struct au_dinfo { | |
9321 | + atomic_t di_generation; | |
9322 | + | |
dece6358 | 9323 | + struct au_rwsem di_rwsem; |
5afbbe0d | 9324 | + aufs_bindex_t di_btop, di_bbot, di_bwh, di_bdiropq; |
38d290e6 | 9325 | + unsigned char di_tmpfile; /* to allow the different name */ |
1c60b727 | 9326 | + struct au_hdentry *di_hdentry; |
4a4d8108 | 9327 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 9328 | + |
9329 | +/* ---------------------------------------------------------------------- */ | |
9330 | + | |
5afbbe0d AM |
9331 | +/* flags for au_lkup_dentry() */ |
9332 | +#define AuLkup_ALLOW_NEG 1 | |
9333 | +#define AuLkup_IGNORE_PERM (1 << 1) | |
8b6a4947 | 9334 | +#define AuLkup_DIRREN (1 << 2) |
5afbbe0d AM |
9335 | +#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name) |
9336 | +#define au_fset_lkup(flags, name) \ | |
9337 | + do { (flags) |= AuLkup_##name; } while (0) | |
9338 | +#define au_fclr_lkup(flags, name) \ | |
9339 | + do { (flags) &= ~AuLkup_##name; } while (0) | |
9340 | + | |
8b6a4947 AM |
9341 | +#ifndef CONFIG_AUFS_DIRREN |
9342 | +#undef AuLkup_DIRREN | |
9343 | +#define AuLkup_DIRREN 0 | |
9344 | +#endif | |
9345 | + | |
9346 | +struct au_do_lookup_args { | |
9347 | + unsigned int flags; | |
9348 | + mode_t type; | |
9349 | + struct qstr whname, *name; | |
9350 | + struct au_dr_lookup dirren; | |
9351 | +}; | |
9352 | + | |
5afbbe0d AM |
9353 | +/* ---------------------------------------------------------------------- */ |
9354 | + | |
1facf9fc | 9355 | +/* dentry.c */ |
79b8bda9 | 9356 | +extern const struct dentry_operations aufs_dop, aufs_dop_noreval; |
1facf9fc | 9357 | +struct au_branch; |
076b876e | 9358 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent); |
1facf9fc | 9359 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, |
9360 | + struct dentry *h_parent, struct au_branch *br); | |
9361 | + | |
5afbbe0d AM |
9362 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t btop, |
9363 | + unsigned int flags); | |
86dc4139 | 9364 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex, int wh); |
027c5e7a | 9365 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent); |
1facf9fc | 9366 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen); |
79b8bda9 | 9367 | +void au_refresh_dop(struct dentry *dentry, int force_reval); |
1facf9fc | 9368 | + |
9369 | +/* dinfo.c */ | |
4a4d8108 | 9370 | +void au_di_init_once(void *_di); |
027c5e7a AM |
9371 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc); |
9372 | +void au_di_free(struct au_dinfo *dinfo); | |
9373 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b); | |
9374 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src); | |
4a4d8108 AM |
9375 | +int au_di_init(struct dentry *dentry); |
9376 | +void au_di_fin(struct dentry *dentry); | |
e2f27e51 | 9377 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink); |
1facf9fc | 9378 | + |
9379 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc); | |
9380 | +void di_read_unlock(struct dentry *d, int flags); | |
9381 | +void di_downgrade_lock(struct dentry *d, int flags); | |
9382 | +void di_write_lock(struct dentry *d, unsigned int lsc); | |
9383 | +void di_write_unlock(struct dentry *d); | |
9384 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir); | |
9385 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir); | |
9386 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2); | |
9387 | + | |
9388 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex); | |
2cbb1c4b | 9389 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex); |
1facf9fc | 9390 | +aufs_bindex_t au_dbtail(struct dentry *dentry); |
9391 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry); | |
9392 | + | |
9393 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
9394 | + struct dentry *h_dentry); | |
027c5e7a AM |
9395 | +int au_digen_test(struct dentry *dentry, unsigned int sigen); |
9396 | +int au_dbrange_test(struct dentry *dentry); | |
1facf9fc | 9397 | +void au_update_digen(struct dentry *dentry); |
9398 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero); | |
5afbbe0d AM |
9399 | +void au_update_dbtop(struct dentry *dentry); |
9400 | +void au_update_dbbot(struct dentry *dentry); | |
1facf9fc | 9401 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry); |
9402 | + | |
9403 | +/* ---------------------------------------------------------------------- */ | |
9404 | + | |
9405 | +static inline struct au_dinfo *au_di(struct dentry *dentry) | |
9406 | +{ | |
9407 | + return dentry->d_fsdata; | |
9408 | +} | |
9409 | + | |
9410 | +/* ---------------------------------------------------------------------- */ | |
9411 | + | |
9412 | +/* lock subclass for dinfo */ | |
9413 | +enum { | |
9414 | + AuLsc_DI_CHILD, /* child first */ | |
4a4d8108 | 9415 | + AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */ |
1facf9fc | 9416 | + AuLsc_DI_CHILD3, /* copyup dirs */ |
9417 | + AuLsc_DI_PARENT, | |
9418 | + AuLsc_DI_PARENT2, | |
027c5e7a AM |
9419 | + AuLsc_DI_PARENT3, |
9420 | + AuLsc_DI_TMP /* temp for replacing dinfo */ | |
1facf9fc | 9421 | +}; |
9422 | + | |
9423 | +/* | |
9424 | + * di_read_lock_child, di_write_lock_child, | |
9425 | + * di_read_lock_child2, di_write_lock_child2, | |
9426 | + * di_read_lock_child3, di_write_lock_child3, | |
9427 | + * di_read_lock_parent, di_write_lock_parent, | |
9428 | + * di_read_lock_parent2, di_write_lock_parent2, | |
9429 | + * di_read_lock_parent3, di_write_lock_parent3, | |
9430 | + */ | |
9431 | +#define AuReadLockFunc(name, lsc) \ | |
9432 | +static inline void di_read_lock_##name(struct dentry *d, int flags) \ | |
9433 | +{ di_read_lock(d, flags, AuLsc_DI_##lsc); } | |
9434 | + | |
9435 | +#define AuWriteLockFunc(name, lsc) \ | |
9436 | +static inline void di_write_lock_##name(struct dentry *d) \ | |
9437 | +{ di_write_lock(d, AuLsc_DI_##lsc); } | |
9438 | + | |
9439 | +#define AuRWLockFuncs(name, lsc) \ | |
9440 | + AuReadLockFunc(name, lsc) \ | |
9441 | + AuWriteLockFunc(name, lsc) | |
9442 | + | |
9443 | +AuRWLockFuncs(child, CHILD); | |
9444 | +AuRWLockFuncs(child2, CHILD2); | |
9445 | +AuRWLockFuncs(child3, CHILD3); | |
9446 | +AuRWLockFuncs(parent, PARENT); | |
9447 | +AuRWLockFuncs(parent2, PARENT2); | |
9448 | +AuRWLockFuncs(parent3, PARENT3); | |
9449 | + | |
9450 | +#undef AuReadLockFunc | |
9451 | +#undef AuWriteLockFunc | |
9452 | +#undef AuRWLockFuncs | |
9453 | + | |
9454 | +#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem) | |
dece6358 AM |
9455 | +#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem) |
9456 | +#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem) | |
1facf9fc | 9457 | + |
9458 | +/* ---------------------------------------------------------------------- */ | |
9459 | + | |
9460 | +/* todo: memory barrier? */ | |
9461 | +static inline unsigned int au_digen(struct dentry *d) | |
9462 | +{ | |
9463 | + return atomic_read(&au_di(d)->di_generation); | |
9464 | +} | |
9465 | + | |
9466 | +static inline void au_h_dentry_init(struct au_hdentry *hdentry) | |
9467 | +{ | |
9468 | + hdentry->hd_dentry = NULL; | |
9469 | +} | |
9470 | + | |
5afbbe0d AM |
9471 | +static inline struct au_hdentry *au_hdentry(struct au_dinfo *di, |
9472 | + aufs_bindex_t bindex) | |
9473 | +{ | |
9474 | + return di->di_hdentry + bindex; | |
9475 | +} | |
9476 | + | |
1facf9fc | 9477 | +static inline void au_hdput(struct au_hdentry *hd) |
9478 | +{ | |
4a4d8108 AM |
9479 | + if (hd) |
9480 | + dput(hd->hd_dentry); | |
1facf9fc | 9481 | +} |
9482 | + | |
5afbbe0d | 9483 | +static inline aufs_bindex_t au_dbtop(struct dentry *dentry) |
1facf9fc | 9484 | +{ |
1308ab2a | 9485 | + DiMustAnyLock(dentry); |
5afbbe0d | 9486 | + return au_di(dentry)->di_btop; |
1facf9fc | 9487 | +} |
9488 | + | |
5afbbe0d | 9489 | +static inline aufs_bindex_t au_dbbot(struct dentry *dentry) |
1facf9fc | 9490 | +{ |
1308ab2a | 9491 | + DiMustAnyLock(dentry); |
5afbbe0d | 9492 | + return au_di(dentry)->di_bbot; |
1facf9fc | 9493 | +} |
9494 | + | |
9495 | +static inline aufs_bindex_t au_dbwh(struct dentry *dentry) | |
9496 | +{ | |
1308ab2a | 9497 | + DiMustAnyLock(dentry); |
1facf9fc | 9498 | + return au_di(dentry)->di_bwh; |
9499 | +} | |
9500 | + | |
9501 | +static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry) | |
9502 | +{ | |
1308ab2a | 9503 | + DiMustAnyLock(dentry); |
1facf9fc | 9504 | + return au_di(dentry)->di_bdiropq; |
9505 | +} | |
9506 | + | |
9507 | +/* todo: hard/soft set? */ | |
5afbbe0d | 9508 | +static inline void au_set_dbtop(struct dentry *dentry, aufs_bindex_t bindex) |
1facf9fc | 9509 | +{ |
1308ab2a | 9510 | + DiMustWriteLock(dentry); |
5afbbe0d | 9511 | + au_di(dentry)->di_btop = bindex; |
1facf9fc | 9512 | +} |
9513 | + | |
5afbbe0d | 9514 | +static inline void au_set_dbbot(struct dentry *dentry, aufs_bindex_t bindex) |
1facf9fc | 9515 | +{ |
1308ab2a | 9516 | + DiMustWriteLock(dentry); |
5afbbe0d | 9517 | + au_di(dentry)->di_bbot = bindex; |
1facf9fc | 9518 | +} |
9519 | + | |
9520 | +static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex) | |
9521 | +{ | |
1308ab2a | 9522 | + DiMustWriteLock(dentry); |
5afbbe0d | 9523 | + /* dbwh can be outside of btop - bbot range */ |
1facf9fc | 9524 | + au_di(dentry)->di_bwh = bindex; |
9525 | +} | |
9526 | + | |
9527 | +static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex) | |
9528 | +{ | |
1308ab2a | 9529 | + DiMustWriteLock(dentry); |
1facf9fc | 9530 | + au_di(dentry)->di_bdiropq = bindex; |
9531 | +} | |
9532 | + | |
9533 | +/* ---------------------------------------------------------------------- */ | |
9534 | + | |
4a4d8108 | 9535 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 9536 | +static inline void au_digen_dec(struct dentry *d) |
9537 | +{ | |
e49829fe | 9538 | + atomic_dec(&au_di(d)->di_generation); |
1facf9fc | 9539 | +} |
9540 | + | |
4a4d8108 | 9541 | +static inline void au_hn_di_reinit(struct dentry *dentry) |
1facf9fc | 9542 | +{ |
9543 | + dentry->d_fsdata = NULL; | |
9544 | +} | |
9545 | +#else | |
4a4d8108 AM |
9546 | +AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused) |
9547 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
1facf9fc | 9548 | + |
9549 | +#endif /* __KERNEL__ */ | |
9550 | +#endif /* __AUFS_DENTRY_H__ */ | |
7f207e10 AM |
9551 | diff -urN /usr/share/empty/fs/aufs/dinfo.c linux/fs/aufs/dinfo.c |
9552 | --- /usr/share/empty/fs/aufs/dinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 9553 | +++ linux/fs/aufs/dinfo.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 9554 | @@ -0,0 +1,554 @@ |
cd7a4cd9 | 9555 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 9556 | +/* |
b00004a5 | 9557 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 9558 | + * |
9559 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9560 | + * it under the terms of the GNU General Public License as published by | |
9561 | + * the Free Software Foundation; either version 2 of the License, or | |
9562 | + * (at your option) any later version. | |
dece6358 AM |
9563 | + * |
9564 | + * This program is distributed in the hope that it will be useful, | |
9565 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9566 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9567 | + * GNU General Public License for more details. | |
9568 | + * | |
9569 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 9570 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 9571 | + */ |
9572 | + | |
9573 | +/* | |
9574 | + * dentry private data | |
9575 | + */ | |
9576 | + | |
9577 | +#include "aufs.h" | |
9578 | + | |
e49829fe | 9579 | +void au_di_init_once(void *_dinfo) |
4a4d8108 | 9580 | +{ |
e49829fe | 9581 | + struct au_dinfo *dinfo = _dinfo; |
4a4d8108 | 9582 | + |
e49829fe | 9583 | + au_rw_init(&dinfo->di_rwsem); |
4a4d8108 AM |
9584 | +} |
9585 | + | |
027c5e7a | 9586 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc) |
1facf9fc | 9587 | +{ |
9588 | + struct au_dinfo *dinfo; | |
027c5e7a | 9589 | + int nbr, i; |
1facf9fc | 9590 | + |
9591 | + dinfo = au_cache_alloc_dinfo(); | |
9592 | + if (unlikely(!dinfo)) | |
9593 | + goto out; | |
9594 | + | |
5afbbe0d | 9595 | + nbr = au_sbbot(sb) + 1; |
1facf9fc | 9596 | + if (nbr <= 0) |
9597 | + nbr = 1; | |
9598 | + dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS); | |
027c5e7a AM |
9599 | + if (dinfo->di_hdentry) { |
9600 | + au_rw_write_lock_nested(&dinfo->di_rwsem, lsc); | |
5afbbe0d AM |
9601 | + dinfo->di_btop = -1; |
9602 | + dinfo->di_bbot = -1; | |
027c5e7a AM |
9603 | + dinfo->di_bwh = -1; |
9604 | + dinfo->di_bdiropq = -1; | |
38d290e6 | 9605 | + dinfo->di_tmpfile = 0; |
027c5e7a AM |
9606 | + for (i = 0; i < nbr; i++) |
9607 | + dinfo->di_hdentry[i].hd_id = -1; | |
9608 | + goto out; | |
9609 | + } | |
1facf9fc | 9610 | + |
1c60b727 | 9611 | + au_cache_free_dinfo(dinfo); |
027c5e7a AM |
9612 | + dinfo = NULL; |
9613 | + | |
4f0767ce | 9614 | +out: |
027c5e7a | 9615 | + return dinfo; |
1facf9fc | 9616 | +} |
9617 | + | |
027c5e7a | 9618 | +void au_di_free(struct au_dinfo *dinfo) |
4a4d8108 | 9619 | +{ |
4a4d8108 | 9620 | + struct au_hdentry *p; |
5afbbe0d | 9621 | + aufs_bindex_t bbot, bindex; |
4a4d8108 AM |
9622 | + |
9623 | + /* dentry may not be revalidated */ | |
5afbbe0d | 9624 | + bindex = dinfo->di_btop; |
4a4d8108 | 9625 | + if (bindex >= 0) { |
5afbbe0d AM |
9626 | + bbot = dinfo->di_bbot; |
9627 | + p = au_hdentry(dinfo, bindex); | |
9628 | + while (bindex++ <= bbot) | |
4a4d8108 AM |
9629 | + au_hdput(p++); |
9630 | + } | |
1c60b727 AM |
9631 | + kfree(dinfo->di_hdentry); |
9632 | + au_cache_free_dinfo(dinfo); | |
027c5e7a AM |
9633 | +} |
9634 | + | |
9635 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b) | |
9636 | +{ | |
9637 | + struct au_hdentry *p; | |
9638 | + aufs_bindex_t bi; | |
9639 | + | |
9640 | + AuRwMustWriteLock(&a->di_rwsem); | |
9641 | + AuRwMustWriteLock(&b->di_rwsem); | |
9642 | + | |
9643 | +#define DiSwap(v, name) \ | |
9644 | + do { \ | |
9645 | + v = a->di_##name; \ | |
9646 | + a->di_##name = b->di_##name; \ | |
9647 | + b->di_##name = v; \ | |
9648 | + } while (0) | |
9649 | + | |
9650 | + DiSwap(p, hdentry); | |
5afbbe0d AM |
9651 | + DiSwap(bi, btop); |
9652 | + DiSwap(bi, bbot); | |
027c5e7a AM |
9653 | + DiSwap(bi, bwh); |
9654 | + DiSwap(bi, bdiropq); | |
9655 | + /* smp_mb(); */ | |
9656 | + | |
9657 | +#undef DiSwap | |
9658 | +} | |
9659 | + | |
9660 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src) | |
9661 | +{ | |
9662 | + AuRwMustWriteLock(&dst->di_rwsem); | |
9663 | + AuRwMustWriteLock(&src->di_rwsem); | |
9664 | + | |
5afbbe0d AM |
9665 | + dst->di_btop = src->di_btop; |
9666 | + dst->di_bbot = src->di_bbot; | |
027c5e7a AM |
9667 | + dst->di_bwh = src->di_bwh; |
9668 | + dst->di_bdiropq = src->di_bdiropq; | |
9669 | + /* smp_mb(); */ | |
9670 | +} | |
9671 | + | |
9672 | +int au_di_init(struct dentry *dentry) | |
9673 | +{ | |
9674 | + int err; | |
9675 | + struct super_block *sb; | |
9676 | + struct au_dinfo *dinfo; | |
9677 | + | |
9678 | + err = 0; | |
9679 | + sb = dentry->d_sb; | |
9680 | + dinfo = au_di_alloc(sb, AuLsc_DI_CHILD); | |
9681 | + if (dinfo) { | |
9682 | + atomic_set(&dinfo->di_generation, au_sigen(sb)); | |
9683 | + /* smp_mb(); */ /* atomic_set */ | |
9684 | + dentry->d_fsdata = dinfo; | |
9685 | + } else | |
9686 | + err = -ENOMEM; | |
9687 | + | |
9688 | + return err; | |
9689 | +} | |
9690 | + | |
9691 | +void au_di_fin(struct dentry *dentry) | |
9692 | +{ | |
9693 | + struct au_dinfo *dinfo; | |
9694 | + | |
9695 | + dinfo = au_di(dentry); | |
9696 | + AuRwDestroy(&dinfo->di_rwsem); | |
9697 | + au_di_free(dinfo); | |
4a4d8108 AM |
9698 | +} |
9699 | + | |
e2f27e51 | 9700 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr, int may_shrink) |
1facf9fc | 9701 | +{ |
9702 | + int err, sz; | |
9703 | + struct au_hdentry *hdp; | |
9704 | + | |
1308ab2a | 9705 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
9706 | + | |
1facf9fc | 9707 | + err = -ENOMEM; |
5afbbe0d | 9708 | + sz = sizeof(*hdp) * (dinfo->di_bbot + 1); |
1facf9fc | 9709 | + if (!sz) |
9710 | + sz = sizeof(*hdp); | |
e2f27e51 AM |
9711 | + hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS, |
9712 | + may_shrink); | |
1facf9fc | 9713 | + if (hdp) { |
9714 | + dinfo->di_hdentry = hdp; | |
9715 | + err = 0; | |
9716 | + } | |
9717 | + | |
9718 | + return err; | |
9719 | +} | |
9720 | + | |
9721 | +/* ---------------------------------------------------------------------- */ | |
9722 | + | |
9723 | +static void do_ii_write_lock(struct inode *inode, unsigned int lsc) | |
9724 | +{ | |
9725 | + switch (lsc) { | |
9726 | + case AuLsc_DI_CHILD: | |
9727 | + ii_write_lock_child(inode); | |
9728 | + break; | |
9729 | + case AuLsc_DI_CHILD2: | |
9730 | + ii_write_lock_child2(inode); | |
9731 | + break; | |
9732 | + case AuLsc_DI_CHILD3: | |
9733 | + ii_write_lock_child3(inode); | |
9734 | + break; | |
9735 | + case AuLsc_DI_PARENT: | |
9736 | + ii_write_lock_parent(inode); | |
9737 | + break; | |
9738 | + case AuLsc_DI_PARENT2: | |
9739 | + ii_write_lock_parent2(inode); | |
9740 | + break; | |
9741 | + case AuLsc_DI_PARENT3: | |
9742 | + ii_write_lock_parent3(inode); | |
9743 | + break; | |
9744 | + default: | |
9745 | + BUG(); | |
9746 | + } | |
9747 | +} | |
9748 | + | |
9749 | +static void do_ii_read_lock(struct inode *inode, unsigned int lsc) | |
9750 | +{ | |
9751 | + switch (lsc) { | |
9752 | + case AuLsc_DI_CHILD: | |
9753 | + ii_read_lock_child(inode); | |
9754 | + break; | |
9755 | + case AuLsc_DI_CHILD2: | |
9756 | + ii_read_lock_child2(inode); | |
9757 | + break; | |
9758 | + case AuLsc_DI_CHILD3: | |
9759 | + ii_read_lock_child3(inode); | |
9760 | + break; | |
9761 | + case AuLsc_DI_PARENT: | |
9762 | + ii_read_lock_parent(inode); | |
9763 | + break; | |
9764 | + case AuLsc_DI_PARENT2: | |
9765 | + ii_read_lock_parent2(inode); | |
9766 | + break; | |
9767 | + case AuLsc_DI_PARENT3: | |
9768 | + ii_read_lock_parent3(inode); | |
9769 | + break; | |
9770 | + default: | |
9771 | + BUG(); | |
9772 | + } | |
9773 | +} | |
9774 | + | |
9775 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc) | |
9776 | +{ | |
5527c038 JR |
9777 | + struct inode *inode; |
9778 | + | |
dece6358 | 9779 | + au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc); |
5527c038 JR |
9780 | + if (d_really_is_positive(d)) { |
9781 | + inode = d_inode(d); | |
1facf9fc | 9782 | + if (au_ftest_lock(flags, IW)) |
5527c038 | 9783 | + do_ii_write_lock(inode, lsc); |
1facf9fc | 9784 | + else if (au_ftest_lock(flags, IR)) |
5527c038 | 9785 | + do_ii_read_lock(inode, lsc); |
1facf9fc | 9786 | + } |
9787 | +} | |
9788 | + | |
9789 | +void di_read_unlock(struct dentry *d, int flags) | |
9790 | +{ | |
5527c038 JR |
9791 | + struct inode *inode; |
9792 | + | |
9793 | + if (d_really_is_positive(d)) { | |
9794 | + inode = d_inode(d); | |
027c5e7a AM |
9795 | + if (au_ftest_lock(flags, IW)) { |
9796 | + au_dbg_verify_dinode(d); | |
5527c038 | 9797 | + ii_write_unlock(inode); |
027c5e7a AM |
9798 | + } else if (au_ftest_lock(flags, IR)) { |
9799 | + au_dbg_verify_dinode(d); | |
5527c038 | 9800 | + ii_read_unlock(inode); |
027c5e7a | 9801 | + } |
1facf9fc | 9802 | + } |
dece6358 | 9803 | + au_rw_read_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 9804 | +} |
9805 | + | |
9806 | +void di_downgrade_lock(struct dentry *d, int flags) | |
9807 | +{ | |
5527c038 JR |
9808 | + if (d_really_is_positive(d) && au_ftest_lock(flags, IR)) |
9809 | + ii_downgrade_lock(d_inode(d)); | |
dece6358 | 9810 | + au_rw_dgrade_lock(&au_di(d)->di_rwsem); |
1facf9fc | 9811 | +} |
9812 | + | |
9813 | +void di_write_lock(struct dentry *d, unsigned int lsc) | |
9814 | +{ | |
dece6358 | 9815 | + au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc); |
5527c038 JR |
9816 | + if (d_really_is_positive(d)) |
9817 | + do_ii_write_lock(d_inode(d), lsc); | |
1facf9fc | 9818 | +} |
9819 | + | |
9820 | +void di_write_unlock(struct dentry *d) | |
9821 | +{ | |
027c5e7a | 9822 | + au_dbg_verify_dinode(d); |
5527c038 JR |
9823 | + if (d_really_is_positive(d)) |
9824 | + ii_write_unlock(d_inode(d)); | |
dece6358 | 9825 | + au_rw_write_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 9826 | +} |
9827 | + | |
9828 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir) | |
9829 | +{ | |
9830 | + AuDebugOn(d1 == d2 | |
5527c038 | 9831 | + || d_inode(d1) == d_inode(d2) |
1facf9fc | 9832 | + || d1->d_sb != d2->d_sb); |
9833 | + | |
521ced18 JR |
9834 | + if ((isdir && au_test_subdir(d1, d2)) |
9835 | + || d1 < d2) { | |
1facf9fc | 9836 | + di_write_lock_child(d1); |
9837 | + di_write_lock_child2(d2); | |
9838 | + } else { | |
1facf9fc | 9839 | + di_write_lock_child(d2); |
9840 | + di_write_lock_child2(d1); | |
9841 | + } | |
9842 | +} | |
9843 | + | |
9844 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir) | |
9845 | +{ | |
9846 | + AuDebugOn(d1 == d2 | |
5527c038 | 9847 | + || d_inode(d1) == d_inode(d2) |
1facf9fc | 9848 | + || d1->d_sb != d2->d_sb); |
9849 | + | |
521ced18 JR |
9850 | + if ((isdir && au_test_subdir(d1, d2)) |
9851 | + || d1 < d2) { | |
1facf9fc | 9852 | + di_write_lock_parent(d1); |
9853 | + di_write_lock_parent2(d2); | |
9854 | + } else { | |
1facf9fc | 9855 | + di_write_lock_parent(d2); |
9856 | + di_write_lock_parent2(d1); | |
9857 | + } | |
9858 | +} | |
9859 | + | |
9860 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2) | |
9861 | +{ | |
9862 | + di_write_unlock(d1); | |
5527c038 | 9863 | + if (d_inode(d1) == d_inode(d2)) |
dece6358 | 9864 | + au_rw_write_unlock(&au_di(d2)->di_rwsem); |
1facf9fc | 9865 | + else |
9866 | + di_write_unlock(d2); | |
9867 | +} | |
9868 | + | |
9869 | +/* ---------------------------------------------------------------------- */ | |
9870 | + | |
9871 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex) | |
9872 | +{ | |
9873 | + struct dentry *d; | |
9874 | + | |
1308ab2a | 9875 | + DiMustAnyLock(dentry); |
9876 | + | |
5afbbe0d | 9877 | + if (au_dbtop(dentry) < 0 || bindex < au_dbtop(dentry)) |
1facf9fc | 9878 | + return NULL; |
9879 | + AuDebugOn(bindex < 0); | |
5afbbe0d | 9880 | + d = au_hdentry(au_di(dentry), bindex)->hd_dentry; |
c1595e42 | 9881 | + AuDebugOn(d && au_dcount(d) <= 0); |
1facf9fc | 9882 | + return d; |
9883 | +} | |
9884 | + | |
2cbb1c4b JR |
9885 | +/* |
9886 | + * extended version of au_h_dptr(). | |
38d290e6 JR |
9887 | + * returns a hashed and positive (or linkable) h_dentry in bindex, NULL, or |
9888 | + * error. | |
2cbb1c4b JR |
9889 | + */ |
9890 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex) | |
9891 | +{ | |
9892 | + struct dentry *h_dentry; | |
9893 | + struct inode *inode, *h_inode; | |
9894 | + | |
5527c038 | 9895 | + AuDebugOn(d_really_is_negative(dentry)); |
2cbb1c4b JR |
9896 | + |
9897 | + h_dentry = NULL; | |
5afbbe0d AM |
9898 | + if (au_dbtop(dentry) <= bindex |
9899 | + && bindex <= au_dbbot(dentry)) | |
2cbb1c4b | 9900 | + h_dentry = au_h_dptr(dentry, bindex); |
38d290e6 | 9901 | + if (h_dentry && !au_d_linkable(h_dentry)) { |
2cbb1c4b JR |
9902 | + dget(h_dentry); |
9903 | + goto out; /* success */ | |
9904 | + } | |
9905 | + | |
5527c038 | 9906 | + inode = d_inode(dentry); |
5afbbe0d AM |
9907 | + AuDebugOn(bindex < au_ibtop(inode)); |
9908 | + AuDebugOn(au_ibbot(inode) < bindex); | |
2cbb1c4b JR |
9909 | + h_inode = au_h_iptr(inode, bindex); |
9910 | + h_dentry = d_find_alias(h_inode); | |
9911 | + if (h_dentry) { | |
9912 | + if (!IS_ERR(h_dentry)) { | |
38d290e6 | 9913 | + if (!au_d_linkable(h_dentry)) |
2cbb1c4b JR |
9914 | + goto out; /* success */ |
9915 | + dput(h_dentry); | |
9916 | + } else | |
9917 | + goto out; | |
9918 | + } | |
9919 | + | |
9920 | + if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) { | |
9921 | + h_dentry = au_plink_lkup(inode, bindex); | |
9922 | + AuDebugOn(!h_dentry); | |
9923 | + if (!IS_ERR(h_dentry)) { | |
9924 | + if (!au_d_hashed_positive(h_dentry)) | |
9925 | + goto out; /* success */ | |
9926 | + dput(h_dentry); | |
9927 | + h_dentry = NULL; | |
9928 | + } | |
9929 | + } | |
9930 | + | |
9931 | +out: | |
9932 | + AuDbgDentry(h_dentry); | |
9933 | + return h_dentry; | |
9934 | +} | |
9935 | + | |
1facf9fc | 9936 | +aufs_bindex_t au_dbtail(struct dentry *dentry) |
9937 | +{ | |
5afbbe0d | 9938 | + aufs_bindex_t bbot, bwh; |
1facf9fc | 9939 | + |
5afbbe0d AM |
9940 | + bbot = au_dbbot(dentry); |
9941 | + if (0 <= bbot) { | |
1facf9fc | 9942 | + bwh = au_dbwh(dentry); |
9943 | + if (!bwh) | |
9944 | + return bwh; | |
5afbbe0d | 9945 | + if (0 < bwh && bwh < bbot) |
1facf9fc | 9946 | + return bwh - 1; |
9947 | + } | |
5afbbe0d | 9948 | + return bbot; |
1facf9fc | 9949 | +} |
9950 | + | |
9951 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry) | |
9952 | +{ | |
5afbbe0d | 9953 | + aufs_bindex_t bbot, bopq; |
1facf9fc | 9954 | + |
5afbbe0d AM |
9955 | + bbot = au_dbtail(dentry); |
9956 | + if (0 <= bbot) { | |
1facf9fc | 9957 | + bopq = au_dbdiropq(dentry); |
5afbbe0d AM |
9958 | + if (0 <= bopq && bopq < bbot) |
9959 | + bbot = bopq; | |
1facf9fc | 9960 | + } |
5afbbe0d | 9961 | + return bbot; |
1facf9fc | 9962 | +} |
9963 | + | |
9964 | +/* ---------------------------------------------------------------------- */ | |
9965 | + | |
9966 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
9967 | + struct dentry *h_dentry) | |
9968 | +{ | |
5afbbe0d AM |
9969 | + struct au_dinfo *dinfo; |
9970 | + struct au_hdentry *hd; | |
027c5e7a | 9971 | + struct au_branch *br; |
1facf9fc | 9972 | + |
1308ab2a | 9973 | + DiMustWriteLock(dentry); |
9974 | + | |
5afbbe0d AM |
9975 | + dinfo = au_di(dentry); |
9976 | + hd = au_hdentry(dinfo, bindex); | |
4a4d8108 | 9977 | + au_hdput(hd); |
1facf9fc | 9978 | + hd->hd_dentry = h_dentry; |
027c5e7a AM |
9979 | + if (h_dentry) { |
9980 | + br = au_sbr(dentry->d_sb, bindex); | |
9981 | + hd->hd_id = br->br_id; | |
9982 | + } | |
9983 | +} | |
9984 | + | |
9985 | +int au_dbrange_test(struct dentry *dentry) | |
9986 | +{ | |
9987 | + int err; | |
5afbbe0d | 9988 | + aufs_bindex_t btop, bbot; |
027c5e7a AM |
9989 | + |
9990 | + err = 0; | |
5afbbe0d AM |
9991 | + btop = au_dbtop(dentry); |
9992 | + bbot = au_dbbot(dentry); | |
9993 | + if (btop >= 0) | |
9994 | + AuDebugOn(bbot < 0 && btop > bbot); | |
027c5e7a AM |
9995 | + else { |
9996 | + err = -EIO; | |
5afbbe0d | 9997 | + AuDebugOn(bbot >= 0); |
027c5e7a AM |
9998 | + } |
9999 | + | |
10000 | + return err; | |
10001 | +} | |
10002 | + | |
10003 | +int au_digen_test(struct dentry *dentry, unsigned int sigen) | |
10004 | +{ | |
10005 | + int err; | |
10006 | + | |
10007 | + err = 0; | |
10008 | + if (unlikely(au_digen(dentry) != sigen | |
5527c038 | 10009 | + || au_iigen_test(d_inode(dentry), sigen))) |
027c5e7a AM |
10010 | + err = -EIO; |
10011 | + | |
10012 | + return err; | |
1facf9fc | 10013 | +} |
10014 | + | |
10015 | +void au_update_digen(struct dentry *dentry) | |
10016 | +{ | |
10017 | + atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb)); | |
10018 | + /* smp_mb(); */ /* atomic_set */ | |
10019 | +} | |
10020 | + | |
10021 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero) | |
10022 | +{ | |
10023 | + struct au_dinfo *dinfo; | |
10024 | + struct dentry *h_d; | |
4a4d8108 | 10025 | + struct au_hdentry *hdp; |
5afbbe0d | 10026 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10027 | + |
1308ab2a | 10028 | + DiMustWriteLock(dentry); |
10029 | + | |
1facf9fc | 10030 | + dinfo = au_di(dentry); |
5afbbe0d | 10031 | + if (!dinfo || dinfo->di_btop < 0) |
1facf9fc | 10032 | + return; |
10033 | + | |
10034 | + if (do_put_zero) { | |
5afbbe0d AM |
10035 | + bbot = dinfo->di_bbot; |
10036 | + bindex = dinfo->di_btop; | |
10037 | + hdp = au_hdentry(dinfo, bindex); | |
10038 | + for (; bindex <= bbot; bindex++, hdp++) { | |
10039 | + h_d = hdp->hd_dentry; | |
5527c038 | 10040 | + if (h_d && d_is_negative(h_d)) |
1facf9fc | 10041 | + au_set_h_dptr(dentry, bindex, NULL); |
10042 | + } | |
10043 | + } | |
10044 | + | |
5afbbe0d AM |
10045 | + dinfo->di_btop = 0; |
10046 | + hdp = au_hdentry(dinfo, dinfo->di_btop); | |
10047 | + for (; dinfo->di_btop <= dinfo->di_bbot; dinfo->di_btop++, hdp++) | |
10048 | + if (hdp->hd_dentry) | |
1facf9fc | 10049 | + break; |
5afbbe0d AM |
10050 | + if (dinfo->di_btop > dinfo->di_bbot) { |
10051 | + dinfo->di_btop = -1; | |
10052 | + dinfo->di_bbot = -1; | |
1facf9fc | 10053 | + return; |
10054 | + } | |
10055 | + | |
5afbbe0d AM |
10056 | + hdp = au_hdentry(dinfo, dinfo->di_bbot); |
10057 | + for (; dinfo->di_bbot >= 0; dinfo->di_bbot--, hdp--) | |
10058 | + if (hdp->hd_dentry) | |
1facf9fc | 10059 | + break; |
5afbbe0d | 10060 | + AuDebugOn(dinfo->di_btop > dinfo->di_bbot || dinfo->di_bbot < 0); |
1facf9fc | 10061 | +} |
10062 | + | |
5afbbe0d | 10063 | +void au_update_dbtop(struct dentry *dentry) |
1facf9fc | 10064 | +{ |
5afbbe0d | 10065 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10066 | + struct dentry *h_dentry; |
10067 | + | |
5afbbe0d AM |
10068 | + bbot = au_dbbot(dentry); |
10069 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { | |
1facf9fc | 10070 | + h_dentry = au_h_dptr(dentry, bindex); |
10071 | + if (!h_dentry) | |
10072 | + continue; | |
5527c038 | 10073 | + if (d_is_positive(h_dentry)) { |
5afbbe0d | 10074 | + au_set_dbtop(dentry, bindex); |
1facf9fc | 10075 | + return; |
10076 | + } | |
10077 | + au_set_h_dptr(dentry, bindex, NULL); | |
10078 | + } | |
10079 | +} | |
10080 | + | |
5afbbe0d | 10081 | +void au_update_dbbot(struct dentry *dentry) |
1facf9fc | 10082 | +{ |
5afbbe0d | 10083 | + aufs_bindex_t bindex, btop; |
1facf9fc | 10084 | + struct dentry *h_dentry; |
10085 | + | |
5afbbe0d AM |
10086 | + btop = au_dbtop(dentry); |
10087 | + for (bindex = au_dbbot(dentry); bindex >= btop; bindex--) { | |
1facf9fc | 10088 | + h_dentry = au_h_dptr(dentry, bindex); |
10089 | + if (!h_dentry) | |
10090 | + continue; | |
5527c038 | 10091 | + if (d_is_positive(h_dentry)) { |
5afbbe0d | 10092 | + au_set_dbbot(dentry, bindex); |
1facf9fc | 10093 | + return; |
10094 | + } | |
10095 | + au_set_h_dptr(dentry, bindex, NULL); | |
10096 | + } | |
10097 | +} | |
10098 | + | |
10099 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry) | |
10100 | +{ | |
5afbbe0d | 10101 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10102 | + |
5afbbe0d AM |
10103 | + bbot = au_dbbot(dentry); |
10104 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) | |
1facf9fc | 10105 | + if (au_h_dptr(dentry, bindex) == h_dentry) |
10106 | + return bindex; | |
10107 | + return -1; | |
10108 | +} | |
7f207e10 AM |
10109 | diff -urN /usr/share/empty/fs/aufs/dir.c linux/fs/aufs/dir.c |
10110 | --- /usr/share/empty/fs/aufs/dir.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 10111 | +++ linux/fs/aufs/dir.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 10112 | @@ -0,0 +1,760 @@ |
cd7a4cd9 | 10113 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 10114 | +/* |
b00004a5 | 10115 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 10116 | + * |
10117 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10118 | + * it under the terms of the GNU General Public License as published by | |
10119 | + * the Free Software Foundation; either version 2 of the License, or | |
10120 | + * (at your option) any later version. | |
dece6358 AM |
10121 | + * |
10122 | + * This program is distributed in the hope that it will be useful, | |
10123 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10124 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10125 | + * GNU General Public License for more details. | |
10126 | + * | |
10127 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 10128 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 10129 | + */ |
10130 | + | |
10131 | +/* | |
10132 | + * directory operations | |
10133 | + */ | |
10134 | + | |
10135 | +#include <linux/fs_stack.h> | |
10136 | +#include "aufs.h" | |
10137 | + | |
10138 | +void au_add_nlink(struct inode *dir, struct inode *h_dir) | |
10139 | +{ | |
9dbd164d AM |
10140 | + unsigned int nlink; |
10141 | + | |
1facf9fc | 10142 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); |
10143 | + | |
9dbd164d AM |
10144 | + nlink = dir->i_nlink; |
10145 | + nlink += h_dir->i_nlink - 2; | |
1facf9fc | 10146 | + if (h_dir->i_nlink < 2) |
9dbd164d | 10147 | + nlink += 2; |
f6b6e03d | 10148 | + smp_mb(); /* for i_nlink */ |
7eafdf33 | 10149 | + /* 0 can happen in revaliding */ |
92d182d2 | 10150 | + set_nlink(dir, nlink); |
1facf9fc | 10151 | +} |
10152 | + | |
10153 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir) | |
10154 | +{ | |
9dbd164d AM |
10155 | + unsigned int nlink; |
10156 | + | |
1facf9fc | 10157 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); |
10158 | + | |
9dbd164d AM |
10159 | + nlink = dir->i_nlink; |
10160 | + nlink -= h_dir->i_nlink - 2; | |
1facf9fc | 10161 | + if (h_dir->i_nlink < 2) |
9dbd164d | 10162 | + nlink -= 2; |
f6b6e03d | 10163 | + smp_mb(); /* for i_nlink */ |
92d182d2 | 10164 | + /* nlink == 0 means the branch-fs is broken */ |
9dbd164d | 10165 | + set_nlink(dir, nlink); |
1facf9fc | 10166 | +} |
10167 | + | |
1308ab2a | 10168 | +loff_t au_dir_size(struct file *file, struct dentry *dentry) |
10169 | +{ | |
10170 | + loff_t sz; | |
5afbbe0d | 10171 | + aufs_bindex_t bindex, bbot; |
1308ab2a | 10172 | + struct file *h_file; |
10173 | + struct dentry *h_dentry; | |
10174 | + | |
10175 | + sz = 0; | |
10176 | + if (file) { | |
2000de60 | 10177 | + AuDebugOn(!d_is_dir(file->f_path.dentry)); |
1308ab2a | 10178 | + |
5afbbe0d AM |
10179 | + bbot = au_fbbot_dir(file); |
10180 | + for (bindex = au_fbtop(file); | |
10181 | + bindex <= bbot && sz < KMALLOC_MAX_SIZE; | |
1308ab2a | 10182 | + bindex++) { |
4a4d8108 | 10183 | + h_file = au_hf_dir(file, bindex); |
c06a8ce3 AM |
10184 | + if (h_file && file_inode(h_file)) |
10185 | + sz += vfsub_f_size_read(h_file); | |
1308ab2a | 10186 | + } |
10187 | + } else { | |
10188 | + AuDebugOn(!dentry); | |
2000de60 | 10189 | + AuDebugOn(!d_is_dir(dentry)); |
1308ab2a | 10190 | + |
5afbbe0d AM |
10191 | + bbot = au_dbtaildir(dentry); |
10192 | + for (bindex = au_dbtop(dentry); | |
10193 | + bindex <= bbot && sz < KMALLOC_MAX_SIZE; | |
1308ab2a | 10194 | + bindex++) { |
10195 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 JR |
10196 | + if (h_dentry && d_is_positive(h_dentry)) |
10197 | + sz += i_size_read(d_inode(h_dentry)); | |
1308ab2a | 10198 | + } |
10199 | + } | |
10200 | + if (sz < KMALLOC_MAX_SIZE) | |
10201 | + sz = roundup_pow_of_two(sz); | |
10202 | + if (sz > KMALLOC_MAX_SIZE) | |
10203 | + sz = KMALLOC_MAX_SIZE; | |
10204 | + else if (sz < NAME_MAX) { | |
10205 | + BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX); | |
10206 | + sz = AUFS_RDBLK_DEF; | |
10207 | + } | |
10208 | + return sz; | |
10209 | +} | |
10210 | + | |
b912730e AM |
10211 | +struct au_dir_ts_arg { |
10212 | + struct dentry *dentry; | |
10213 | + aufs_bindex_t brid; | |
10214 | +}; | |
10215 | + | |
10216 | +static void au_do_dir_ts(void *arg) | |
10217 | +{ | |
10218 | + struct au_dir_ts_arg *a = arg; | |
10219 | + struct au_dtime dt; | |
10220 | + struct path h_path; | |
10221 | + struct inode *dir, *h_dir; | |
10222 | + struct super_block *sb; | |
10223 | + struct au_branch *br; | |
10224 | + struct au_hinode *hdir; | |
10225 | + int err; | |
5afbbe0d | 10226 | + aufs_bindex_t btop, bindex; |
b912730e AM |
10227 | + |
10228 | + sb = a->dentry->d_sb; | |
5527c038 | 10229 | + if (d_really_is_negative(a->dentry)) |
b912730e | 10230 | + goto out; |
5527c038 | 10231 | + /* no dir->i_mutex lock */ |
b95c5147 AM |
10232 | + aufs_read_lock(a->dentry, AuLock_DW); /* noflush */ |
10233 | + | |
5527c038 | 10234 | + dir = d_inode(a->dentry); |
5afbbe0d | 10235 | + btop = au_ibtop(dir); |
b912730e | 10236 | + bindex = au_br_index(sb, a->brid); |
5afbbe0d | 10237 | + if (bindex < btop) |
b912730e AM |
10238 | + goto out_unlock; |
10239 | + | |
10240 | + br = au_sbr(sb, bindex); | |
10241 | + h_path.dentry = au_h_dptr(a->dentry, bindex); | |
10242 | + if (!h_path.dentry) | |
10243 | + goto out_unlock; | |
10244 | + h_path.mnt = au_br_mnt(br); | |
10245 | + au_dtime_store(&dt, a->dentry, &h_path); | |
10246 | + | |
5afbbe0d | 10247 | + br = au_sbr(sb, btop); |
b912730e AM |
10248 | + if (!au_br_writable(br->br_perm)) |
10249 | + goto out_unlock; | |
5afbbe0d | 10250 | + h_path.dentry = au_h_dptr(a->dentry, btop); |
b912730e AM |
10251 | + h_path.mnt = au_br_mnt(br); |
10252 | + err = vfsub_mnt_want_write(h_path.mnt); | |
10253 | + if (err) | |
10254 | + goto out_unlock; | |
5afbbe0d AM |
10255 | + hdir = au_hi(dir, btop); |
10256 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); | |
10257 | + h_dir = au_h_iptr(dir, btop); | |
b912730e | 10258 | + if (h_dir->i_nlink |
cd7a4cd9 | 10259 | + && timespec64_compare(&h_dir->i_mtime, &dt.dt_mtime) < 0) { |
b912730e AM |
10260 | + dt.dt_h_path = h_path; |
10261 | + au_dtime_revert(&dt); | |
10262 | + } | |
5afbbe0d | 10263 | + au_hn_inode_unlock(hdir); |
b912730e AM |
10264 | + vfsub_mnt_drop_write(h_path.mnt); |
10265 | + au_cpup_attr_timesizes(dir); | |
10266 | + | |
10267 | +out_unlock: | |
10268 | + aufs_read_unlock(a->dentry, AuLock_DW); | |
10269 | +out: | |
10270 | + dput(a->dentry); | |
10271 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
1c60b727 | 10272 | + kfree(arg); |
b912730e AM |
10273 | +} |
10274 | + | |
10275 | +void au_dir_ts(struct inode *dir, aufs_bindex_t bindex) | |
10276 | +{ | |
10277 | + int perm, wkq_err; | |
5afbbe0d | 10278 | + aufs_bindex_t btop; |
b912730e AM |
10279 | + struct au_dir_ts_arg *arg; |
10280 | + struct dentry *dentry; | |
10281 | + struct super_block *sb; | |
10282 | + | |
10283 | + IMustLock(dir); | |
10284 | + | |
10285 | + dentry = d_find_any_alias(dir); | |
10286 | + AuDebugOn(!dentry); | |
10287 | + sb = dentry->d_sb; | |
5afbbe0d AM |
10288 | + btop = au_ibtop(dir); |
10289 | + if (btop == bindex) { | |
b912730e AM |
10290 | + au_cpup_attr_timesizes(dir); |
10291 | + goto out; | |
10292 | + } | |
10293 | + | |
5afbbe0d | 10294 | + perm = au_sbr_perm(sb, btop); |
b912730e AM |
10295 | + if (!au_br_writable(perm)) |
10296 | + goto out; | |
10297 | + | |
10298 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
10299 | + if (!arg) | |
10300 | + goto out; | |
10301 | + | |
10302 | + arg->dentry = dget(dentry); /* will be dput-ted by au_do_dir_ts() */ | |
10303 | + arg->brid = au_sbr_id(sb, bindex); | |
10304 | + wkq_err = au_wkq_nowait(au_do_dir_ts, arg, sb, /*flags*/0); | |
10305 | + if (unlikely(wkq_err)) { | |
10306 | + pr_err("wkq %d\n", wkq_err); | |
10307 | + dput(dentry); | |
1c60b727 | 10308 | + kfree(arg); |
b912730e AM |
10309 | + } |
10310 | + | |
10311 | +out: | |
10312 | + dput(dentry); | |
10313 | +} | |
10314 | + | |
1facf9fc | 10315 | +/* ---------------------------------------------------------------------- */ |
10316 | + | |
10317 | +static int reopen_dir(struct file *file) | |
10318 | +{ | |
10319 | + int err; | |
10320 | + unsigned int flags; | |
5afbbe0d | 10321 | + aufs_bindex_t bindex, btail, btop; |
1facf9fc | 10322 | + struct dentry *dentry, *h_dentry; |
10323 | + struct file *h_file; | |
10324 | + | |
10325 | + /* open all lower dirs */ | |
2000de60 | 10326 | + dentry = file->f_path.dentry; |
5afbbe0d AM |
10327 | + btop = au_dbtop(dentry); |
10328 | + for (bindex = au_fbtop(file); bindex < btop; bindex++) | |
1facf9fc | 10329 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d | 10330 | + au_set_fbtop(file, btop); |
1facf9fc | 10331 | + |
10332 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 10333 | + for (bindex = au_fbbot_dir(file); btail < bindex; bindex--) |
1facf9fc | 10334 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d | 10335 | + au_set_fbbot_dir(file, btail); |
1facf9fc | 10336 | + |
4a4d8108 | 10337 | + flags = vfsub_file_flags(file); |
5afbbe0d | 10338 | + for (bindex = btop; bindex <= btail; bindex++) { |
1facf9fc | 10339 | + h_dentry = au_h_dptr(dentry, bindex); |
10340 | + if (!h_dentry) | |
10341 | + continue; | |
4a4d8108 | 10342 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 10343 | + if (h_file) |
10344 | + continue; | |
10345 | + | |
392086de | 10346 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
1facf9fc | 10347 | + err = PTR_ERR(h_file); |
10348 | + if (IS_ERR(h_file)) | |
10349 | + goto out; /* close all? */ | |
10350 | + au_set_h_fptr(file, bindex, h_file); | |
10351 | + } | |
10352 | + au_update_figen(file); | |
10353 | + /* todo: necessary? */ | |
10354 | + /* file->f_ra = h_file->f_ra; */ | |
10355 | + err = 0; | |
10356 | + | |
4f0767ce | 10357 | +out: |
1facf9fc | 10358 | + return err; |
10359 | +} | |
10360 | + | |
b912730e | 10361 | +static int do_open_dir(struct file *file, int flags, struct file *h_file) |
1facf9fc | 10362 | +{ |
10363 | + int err; | |
10364 | + aufs_bindex_t bindex, btail; | |
10365 | + struct dentry *dentry, *h_dentry; | |
8cdd5066 | 10366 | + struct vfsmount *mnt; |
1facf9fc | 10367 | + |
1308ab2a | 10368 | + FiMustWriteLock(file); |
b912730e | 10369 | + AuDebugOn(h_file); |
1308ab2a | 10370 | + |
523b37e3 | 10371 | + err = 0; |
8cdd5066 | 10372 | + mnt = file->f_path.mnt; |
2000de60 | 10373 | + dentry = file->f_path.dentry; |
be118d29 | 10374 | + file->f_version = inode_query_iversion(d_inode(dentry)); |
5afbbe0d AM |
10375 | + bindex = au_dbtop(dentry); |
10376 | + au_set_fbtop(file, bindex); | |
1facf9fc | 10377 | + btail = au_dbtaildir(dentry); |
5afbbe0d | 10378 | + au_set_fbbot_dir(file, btail); |
1facf9fc | 10379 | + for (; !err && bindex <= btail; bindex++) { |
10380 | + h_dentry = au_h_dptr(dentry, bindex); | |
10381 | + if (!h_dentry) | |
10382 | + continue; | |
10383 | + | |
8cdd5066 JR |
10384 | + err = vfsub_test_mntns(mnt, h_dentry->d_sb); |
10385 | + if (unlikely(err)) | |
10386 | + break; | |
392086de | 10387 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
1facf9fc | 10388 | + if (IS_ERR(h_file)) { |
10389 | + err = PTR_ERR(h_file); | |
10390 | + break; | |
10391 | + } | |
10392 | + au_set_h_fptr(file, bindex, h_file); | |
10393 | + } | |
10394 | + au_update_figen(file); | |
10395 | + /* todo: necessary? */ | |
10396 | + /* file->f_ra = h_file->f_ra; */ | |
10397 | + if (!err) | |
10398 | + return 0; /* success */ | |
10399 | + | |
10400 | + /* close all */ | |
5afbbe0d | 10401 | + for (bindex = au_fbtop(file); bindex <= btail; bindex++) |
1facf9fc | 10402 | + au_set_h_fptr(file, bindex, NULL); |
5afbbe0d AM |
10403 | + au_set_fbtop(file, -1); |
10404 | + au_set_fbbot_dir(file, -1); | |
4a4d8108 | 10405 | + |
1facf9fc | 10406 | + return err; |
10407 | +} | |
10408 | + | |
10409 | +static int aufs_open_dir(struct inode *inode __maybe_unused, | |
10410 | + struct file *file) | |
10411 | +{ | |
4a4d8108 AM |
10412 | + int err; |
10413 | + struct super_block *sb; | |
10414 | + struct au_fidir *fidir; | |
10415 | + | |
10416 | + err = -ENOMEM; | |
2000de60 | 10417 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 | 10418 | + si_read_lock(sb, AuLock_FLUSH); |
e49829fe | 10419 | + fidir = au_fidir_alloc(sb); |
4a4d8108 | 10420 | + if (fidir) { |
b912730e AM |
10421 | + struct au_do_open_args args = { |
10422 | + .open = do_open_dir, | |
10423 | + .fidir = fidir | |
10424 | + }; | |
10425 | + err = au_do_open(file, &args); | |
4a4d8108 | 10426 | + if (unlikely(err)) |
1c60b727 | 10427 | + kfree(fidir); |
4a4d8108 AM |
10428 | + } |
10429 | + si_read_unlock(sb); | |
10430 | + return err; | |
1facf9fc | 10431 | +} |
10432 | + | |
10433 | +static int aufs_release_dir(struct inode *inode __maybe_unused, | |
10434 | + struct file *file) | |
10435 | +{ | |
10436 | + struct au_vdir *vdir_cache; | |
4a4d8108 AM |
10437 | + struct au_finfo *finfo; |
10438 | + struct au_fidir *fidir; | |
f0c0a007 | 10439 | + struct au_hfile *hf; |
5afbbe0d | 10440 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 10441 | + |
4a4d8108 AM |
10442 | + finfo = au_fi(file); |
10443 | + fidir = finfo->fi_hdir; | |
10444 | + if (fidir) { | |
8b6a4947 AM |
10445 | + au_hbl_del(&finfo->fi_hlist, |
10446 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
4a4d8108 AM |
10447 | + vdir_cache = fidir->fd_vdir_cache; /* lock-free */ |
10448 | + if (vdir_cache) | |
1c60b727 | 10449 | + au_vdir_free(vdir_cache); |
4a4d8108 AM |
10450 | + |
10451 | + bindex = finfo->fi_btop; | |
10452 | + if (bindex >= 0) { | |
f0c0a007 | 10453 | + hf = fidir->fd_hfile + bindex; |
4a4d8108 AM |
10454 | + /* |
10455 | + * calls fput() instead of filp_close(), | |
10456 | + * since no dnotify or lock for the lower file. | |
10457 | + */ | |
5afbbe0d | 10458 | + bbot = fidir->fd_bbot; |
f0c0a007 AM |
10459 | + for (; bindex <= bbot; bindex++, hf++) |
10460 | + if (hf->hf_file) | |
1c60b727 | 10461 | + au_hfput(hf, /*execed*/0); |
4a4d8108 | 10462 | + } |
1c60b727 | 10463 | + kfree(fidir); |
4a4d8108 | 10464 | + finfo->fi_hdir = NULL; |
1facf9fc | 10465 | + } |
1c60b727 | 10466 | + au_finfo_fin(file); |
1facf9fc | 10467 | + return 0; |
10468 | +} | |
10469 | + | |
10470 | +/* ---------------------------------------------------------------------- */ | |
10471 | + | |
4a4d8108 AM |
10472 | +static int au_do_flush_dir(struct file *file, fl_owner_t id) |
10473 | +{ | |
10474 | + int err; | |
5afbbe0d | 10475 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
10476 | + struct file *h_file; |
10477 | + | |
10478 | + err = 0; | |
5afbbe0d AM |
10479 | + bbot = au_fbbot_dir(file); |
10480 | + for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { | |
4a4d8108 AM |
10481 | + h_file = au_hf_dir(file, bindex); |
10482 | + if (h_file) | |
10483 | + err = vfsub_flush(h_file, id); | |
10484 | + } | |
10485 | + return err; | |
10486 | +} | |
10487 | + | |
10488 | +static int aufs_flush_dir(struct file *file, fl_owner_t id) | |
10489 | +{ | |
10490 | + return au_do_flush(file, id, au_do_flush_dir); | |
10491 | +} | |
10492 | + | |
10493 | +/* ---------------------------------------------------------------------- */ | |
10494 | + | |
1facf9fc | 10495 | +static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync) |
10496 | +{ | |
10497 | + int err; | |
5afbbe0d | 10498 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 10499 | + struct inode *inode; |
10500 | + struct super_block *sb; | |
10501 | + | |
10502 | + err = 0; | |
10503 | + sb = dentry->d_sb; | |
5527c038 | 10504 | + inode = d_inode(dentry); |
1facf9fc | 10505 | + IMustLock(inode); |
5afbbe0d AM |
10506 | + bbot = au_dbbot(dentry); |
10507 | + for (bindex = au_dbtop(dentry); !err && bindex <= bbot; bindex++) { | |
1facf9fc | 10508 | + struct path h_path; |
1facf9fc | 10509 | + |
10510 | + if (au_test_ro(sb, bindex, inode)) | |
10511 | + continue; | |
10512 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
10513 | + if (!h_path.dentry) | |
10514 | + continue; | |
1facf9fc | 10515 | + |
1facf9fc | 10516 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
53392da6 | 10517 | + err = vfsub_fsync(NULL, &h_path, datasync); |
1facf9fc | 10518 | + } |
10519 | + | |
10520 | + return err; | |
10521 | +} | |
10522 | + | |
10523 | +static int au_do_fsync_dir(struct file *file, int datasync) | |
10524 | +{ | |
10525 | + int err; | |
5afbbe0d | 10526 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 10527 | + struct file *h_file; |
10528 | + struct super_block *sb; | |
10529 | + struct inode *inode; | |
1facf9fc | 10530 | + |
521ced18 | 10531 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); |
1facf9fc | 10532 | + if (unlikely(err)) |
10533 | + goto out; | |
10534 | + | |
c06a8ce3 | 10535 | + inode = file_inode(file); |
b912730e | 10536 | + sb = inode->i_sb; |
5afbbe0d AM |
10537 | + bbot = au_fbbot_dir(file); |
10538 | + for (bindex = au_fbtop(file); !err && bindex <= bbot; bindex++) { | |
4a4d8108 | 10539 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 10540 | + if (!h_file || au_test_ro(sb, bindex, inode)) |
10541 | + continue; | |
10542 | + | |
53392da6 | 10543 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
1facf9fc | 10544 | + } |
10545 | + | |
4f0767ce | 10546 | +out: |
1facf9fc | 10547 | + return err; |
10548 | +} | |
10549 | + | |
10550 | +/* | |
10551 | + * @file may be NULL | |
10552 | + */ | |
1e00d052 AM |
10553 | +static int aufs_fsync_dir(struct file *file, loff_t start, loff_t end, |
10554 | + int datasync) | |
1facf9fc | 10555 | +{ |
10556 | + int err; | |
b752ccd1 | 10557 | + struct dentry *dentry; |
5527c038 | 10558 | + struct inode *inode; |
1facf9fc | 10559 | + struct super_block *sb; |
1facf9fc | 10560 | + |
10561 | + err = 0; | |
2000de60 | 10562 | + dentry = file->f_path.dentry; |
5527c038 | 10563 | + inode = d_inode(dentry); |
febd17d6 | 10564 | + inode_lock(inode); |
1facf9fc | 10565 | + sb = dentry->d_sb; |
10566 | + si_noflush_read_lock(sb); | |
10567 | + if (file) | |
10568 | + err = au_do_fsync_dir(file, datasync); | |
10569 | + else { | |
10570 | + di_write_lock_child(dentry); | |
10571 | + err = au_do_fsync_dir_no_file(dentry, datasync); | |
10572 | + } | |
5527c038 | 10573 | + au_cpup_attr_timesizes(inode); |
1facf9fc | 10574 | + di_write_unlock(dentry); |
10575 | + if (file) | |
10576 | + fi_write_unlock(file); | |
10577 | + | |
10578 | + si_read_unlock(sb); | |
febd17d6 | 10579 | + inode_unlock(inode); |
1facf9fc | 10580 | + return err; |
10581 | +} | |
10582 | + | |
10583 | +/* ---------------------------------------------------------------------- */ | |
10584 | + | |
5afbbe0d | 10585 | +static int aufs_iterate_shared(struct file *file, struct dir_context *ctx) |
1facf9fc | 10586 | +{ |
10587 | + int err; | |
10588 | + struct dentry *dentry; | |
9dbd164d | 10589 | + struct inode *inode, *h_inode; |
1facf9fc | 10590 | + struct super_block *sb; |
10591 | + | |
062440b3 | 10592 | + AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); |
392086de | 10593 | + |
2000de60 | 10594 | + dentry = file->f_path.dentry; |
5527c038 | 10595 | + inode = d_inode(dentry); |
1facf9fc | 10596 | + IMustLock(inode); |
10597 | + | |
10598 | + sb = dentry->d_sb; | |
10599 | + si_read_lock(sb, AuLock_FLUSH); | |
521ced18 | 10600 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1, /*fi_lsc*/0); |
1facf9fc | 10601 | + if (unlikely(err)) |
10602 | + goto out; | |
027c5e7a AM |
10603 | + err = au_alive_dir(dentry); |
10604 | + if (!err) | |
10605 | + err = au_vdir_init(file); | |
1facf9fc | 10606 | + di_downgrade_lock(dentry, AuLock_IR); |
10607 | + if (unlikely(err)) | |
10608 | + goto out_unlock; | |
10609 | + | |
5afbbe0d | 10610 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
b752ccd1 | 10611 | + if (!au_test_nfsd()) { |
392086de | 10612 | + err = au_vdir_fill_de(file, ctx); |
9dbd164d | 10613 | + fsstack_copy_attr_atime(inode, h_inode); |
1facf9fc | 10614 | + } else { |
10615 | + /* | |
10616 | + * nfsd filldir may call lookup_one_len(), vfs_getattr(), | |
10617 | + * encode_fh() and others. | |
10618 | + */ | |
9dbd164d | 10619 | + atomic_inc(&h_inode->i_count); |
1facf9fc | 10620 | + di_read_unlock(dentry, AuLock_IR); |
10621 | + si_read_unlock(sb); | |
392086de | 10622 | + err = au_vdir_fill_de(file, ctx); |
1facf9fc | 10623 | + fsstack_copy_attr_atime(inode, h_inode); |
10624 | + fi_write_unlock(file); | |
9dbd164d | 10625 | + iput(h_inode); |
1facf9fc | 10626 | + |
10627 | + AuTraceErr(err); | |
10628 | + return err; | |
10629 | + } | |
10630 | + | |
4f0767ce | 10631 | +out_unlock: |
1facf9fc | 10632 | + di_read_unlock(dentry, AuLock_IR); |
10633 | + fi_write_unlock(file); | |
4f0767ce | 10634 | +out: |
1facf9fc | 10635 | + si_read_unlock(sb); |
10636 | + return err; | |
10637 | +} | |
10638 | + | |
10639 | +/* ---------------------------------------------------------------------- */ | |
10640 | + | |
10641 | +#define AuTestEmpty_WHONLY 1 | |
dece6358 AM |
10642 | +#define AuTestEmpty_CALLED (1 << 1) |
10643 | +#define AuTestEmpty_SHWH (1 << 2) | |
1facf9fc | 10644 | +#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name) |
7f207e10 AM |
10645 | +#define au_fset_testempty(flags, name) \ |
10646 | + do { (flags) |= AuTestEmpty_##name; } while (0) | |
10647 | +#define au_fclr_testempty(flags, name) \ | |
10648 | + do { (flags) &= ~AuTestEmpty_##name; } while (0) | |
1facf9fc | 10649 | + |
dece6358 AM |
10650 | +#ifndef CONFIG_AUFS_SHWH |
10651 | +#undef AuTestEmpty_SHWH | |
10652 | +#define AuTestEmpty_SHWH 0 | |
10653 | +#endif | |
10654 | + | |
1facf9fc | 10655 | +struct test_empty_arg { |
392086de | 10656 | + struct dir_context ctx; |
1308ab2a | 10657 | + struct au_nhash *whlist; |
1facf9fc | 10658 | + unsigned int flags; |
10659 | + int err; | |
10660 | + aufs_bindex_t bindex; | |
10661 | +}; | |
10662 | + | |
392086de AM |
10663 | +static int test_empty_cb(struct dir_context *ctx, const char *__name, |
10664 | + int namelen, loff_t offset __maybe_unused, u64 ino, | |
dece6358 | 10665 | + unsigned int d_type) |
1facf9fc | 10666 | +{ |
392086de AM |
10667 | + struct test_empty_arg *arg = container_of(ctx, struct test_empty_arg, |
10668 | + ctx); | |
1facf9fc | 10669 | + char *name = (void *)__name; |
10670 | + | |
10671 | + arg->err = 0; | |
10672 | + au_fset_testempty(arg->flags, CALLED); | |
10673 | + /* smp_mb(); */ | |
10674 | + if (name[0] == '.' | |
10675 | + && (namelen == 1 || (name[1] == '.' && namelen == 2))) | |
10676 | + goto out; /* success */ | |
10677 | + | |
10678 | + if (namelen <= AUFS_WH_PFX_LEN | |
10679 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
10680 | + if (au_ftest_testempty(arg->flags, WHONLY) | |
1308ab2a | 10681 | + && !au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 10682 | + arg->err = -ENOTEMPTY; |
10683 | + goto out; | |
10684 | + } | |
10685 | + | |
10686 | + name += AUFS_WH_PFX_LEN; | |
10687 | + namelen -= AUFS_WH_PFX_LEN; | |
1308ab2a | 10688 | + if (!au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 10689 | + arg->err = au_nhash_append_wh |
1308ab2a | 10690 | + (arg->whlist, name, namelen, ino, d_type, arg->bindex, |
dece6358 | 10691 | + au_ftest_testempty(arg->flags, SHWH)); |
1facf9fc | 10692 | + |
4f0767ce | 10693 | +out: |
1facf9fc | 10694 | + /* smp_mb(); */ |
10695 | + AuTraceErr(arg->err); | |
10696 | + return arg->err; | |
10697 | +} | |
10698 | + | |
10699 | +static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
10700 | +{ | |
10701 | + int err; | |
10702 | + struct file *h_file; | |
10703 | + | |
10704 | + h_file = au_h_open(dentry, arg->bindex, | |
10705 | + O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE, | |
392086de | 10706 | + /*file*/NULL, /*force_wr*/0); |
1facf9fc | 10707 | + err = PTR_ERR(h_file); |
10708 | + if (IS_ERR(h_file)) | |
10709 | + goto out; | |
10710 | + | |
10711 | + err = 0; | |
10712 | + if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
c06a8ce3 | 10713 | + && !file_inode(h_file)->i_nlink) |
1facf9fc | 10714 | + goto out_put; |
10715 | + | |
10716 | + do { | |
10717 | + arg->err = 0; | |
10718 | + au_fclr_testempty(arg->flags, CALLED); | |
10719 | + /* smp_mb(); */ | |
392086de | 10720 | + err = vfsub_iterate_dir(h_file, &arg->ctx); |
1facf9fc | 10721 | + if (err >= 0) |
10722 | + err = arg->err; | |
10723 | + } while (!err && au_ftest_testempty(arg->flags, CALLED)); | |
10724 | + | |
4f0767ce | 10725 | +out_put: |
1facf9fc | 10726 | + fput(h_file); |
10727 | + au_sbr_put(dentry->d_sb, arg->bindex); | |
4f0767ce | 10728 | +out: |
1facf9fc | 10729 | + return err; |
10730 | +} | |
10731 | + | |
10732 | +struct do_test_empty_args { | |
10733 | + int *errp; | |
10734 | + struct dentry *dentry; | |
10735 | + struct test_empty_arg *arg; | |
10736 | +}; | |
10737 | + | |
10738 | +static void call_do_test_empty(void *args) | |
10739 | +{ | |
10740 | + struct do_test_empty_args *a = args; | |
10741 | + *a->errp = do_test_empty(a->dentry, a->arg); | |
10742 | +} | |
10743 | + | |
10744 | +static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
10745 | +{ | |
10746 | + int err, wkq_err; | |
10747 | + struct dentry *h_dentry; | |
10748 | + struct inode *h_inode; | |
10749 | + | |
10750 | + h_dentry = au_h_dptr(dentry, arg->bindex); | |
5527c038 | 10751 | + h_inode = d_inode(h_dentry); |
53392da6 | 10752 | + /* todo: i_mode changes anytime? */ |
be118d29 | 10753 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD); |
1facf9fc | 10754 | + err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ); |
3c1bdaff | 10755 | + inode_unlock_shared(h_inode); |
1facf9fc | 10756 | + if (!err) |
10757 | + err = do_test_empty(dentry, arg); | |
10758 | + else { | |
10759 | + struct do_test_empty_args args = { | |
10760 | + .errp = &err, | |
10761 | + .dentry = dentry, | |
10762 | + .arg = arg | |
10763 | + }; | |
10764 | + unsigned int flags = arg->flags; | |
10765 | + | |
10766 | + wkq_err = au_wkq_wait(call_do_test_empty, &args); | |
10767 | + if (unlikely(wkq_err)) | |
10768 | + err = wkq_err; | |
10769 | + arg->flags = flags; | |
10770 | + } | |
10771 | + | |
10772 | + return err; | |
10773 | +} | |
10774 | + | |
10775 | +int au_test_empty_lower(struct dentry *dentry) | |
10776 | +{ | |
10777 | + int err; | |
1308ab2a | 10778 | + unsigned int rdhash; |
5afbbe0d | 10779 | + aufs_bindex_t bindex, btop, btail; |
1308ab2a | 10780 | + struct au_nhash whlist; |
392086de AM |
10781 | + struct test_empty_arg arg = { |
10782 | + .ctx = { | |
2000de60 | 10783 | + .actor = test_empty_cb |
392086de AM |
10784 | + } |
10785 | + }; | |
076b876e | 10786 | + int (*test_empty)(struct dentry *dentry, struct test_empty_arg *arg); |
1facf9fc | 10787 | + |
dece6358 AM |
10788 | + SiMustAnyLock(dentry->d_sb); |
10789 | + | |
1308ab2a | 10790 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; |
10791 | + if (!rdhash) | |
10792 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry)); | |
10793 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
dece6358 | 10794 | + if (unlikely(err)) |
1facf9fc | 10795 | + goto out; |
10796 | + | |
1facf9fc | 10797 | + arg.flags = 0; |
1308ab2a | 10798 | + arg.whlist = &whlist; |
5afbbe0d | 10799 | + btop = au_dbtop(dentry); |
dece6358 AM |
10800 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
10801 | + au_fset_testempty(arg.flags, SHWH); | |
076b876e AM |
10802 | + test_empty = do_test_empty; |
10803 | + if (au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1)) | |
10804 | + test_empty = sio_test_empty; | |
5afbbe0d | 10805 | + arg.bindex = btop; |
076b876e | 10806 | + err = test_empty(dentry, &arg); |
1facf9fc | 10807 | + if (unlikely(err)) |
10808 | + goto out_whlist; | |
10809 | + | |
10810 | + au_fset_testempty(arg.flags, WHONLY); | |
10811 | + btail = au_dbtaildir(dentry); | |
5afbbe0d | 10812 | + for (bindex = btop + 1; !err && bindex <= btail; bindex++) { |
1facf9fc | 10813 | + struct dentry *h_dentry; |
10814 | + | |
10815 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 10816 | + if (h_dentry && d_is_positive(h_dentry)) { |
1facf9fc | 10817 | + arg.bindex = bindex; |
076b876e | 10818 | + err = test_empty(dentry, &arg); |
1facf9fc | 10819 | + } |
10820 | + } | |
10821 | + | |
4f0767ce | 10822 | +out_whlist: |
1308ab2a | 10823 | + au_nhash_wh_free(&whlist); |
4f0767ce | 10824 | +out: |
1facf9fc | 10825 | + return err; |
10826 | +} | |
10827 | + | |
10828 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist) | |
10829 | +{ | |
10830 | + int err; | |
392086de AM |
10831 | + struct test_empty_arg arg = { |
10832 | + .ctx = { | |
2000de60 | 10833 | + .actor = test_empty_cb |
392086de AM |
10834 | + } |
10835 | + }; | |
1facf9fc | 10836 | + aufs_bindex_t bindex, btail; |
10837 | + | |
10838 | + err = 0; | |
1308ab2a | 10839 | + arg.whlist = whlist; |
1facf9fc | 10840 | + arg.flags = AuTestEmpty_WHONLY; |
dece6358 AM |
10841 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
10842 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 10843 | + btail = au_dbtaildir(dentry); |
5afbbe0d | 10844 | + for (bindex = au_dbtop(dentry); !err && bindex <= btail; bindex++) { |
1facf9fc | 10845 | + struct dentry *h_dentry; |
10846 | + | |
10847 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 10848 | + if (h_dentry && d_is_positive(h_dentry)) { |
1facf9fc | 10849 | + arg.bindex = bindex; |
10850 | + err = sio_test_empty(dentry, &arg); | |
10851 | + } | |
10852 | + } | |
10853 | + | |
10854 | + return err; | |
10855 | +} | |
10856 | + | |
10857 | +/* ---------------------------------------------------------------------- */ | |
10858 | + | |
10859 | +const struct file_operations aufs_dir_fop = { | |
4a4d8108 | 10860 | + .owner = THIS_MODULE, |
027c5e7a | 10861 | + .llseek = default_llseek, |
1facf9fc | 10862 | + .read = generic_read_dir, |
5afbbe0d | 10863 | + .iterate_shared = aufs_iterate_shared, |
1facf9fc | 10864 | + .unlocked_ioctl = aufs_ioctl_dir, |
b752ccd1 AM |
10865 | +#ifdef CONFIG_COMPAT |
10866 | + .compat_ioctl = aufs_compat_ioctl_dir, | |
10867 | +#endif | |
1facf9fc | 10868 | + .open = aufs_open_dir, |
10869 | + .release = aufs_release_dir, | |
4a4d8108 | 10870 | + .flush = aufs_flush_dir, |
1facf9fc | 10871 | + .fsync = aufs_fsync_dir |
10872 | +}; | |
7f207e10 AM |
10873 | diff -urN /usr/share/empty/fs/aufs/dir.h linux/fs/aufs/dir.h |
10874 | --- /usr/share/empty/fs/aufs/dir.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 10875 | +++ linux/fs/aufs/dir.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
10876 | @@ -0,0 +1,132 @@ |
10877 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 10878 | +/* |
b00004a5 | 10879 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 10880 | + * |
10881 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10882 | + * it under the terms of the GNU General Public License as published by | |
10883 | + * the Free Software Foundation; either version 2 of the License, or | |
10884 | + * (at your option) any later version. | |
dece6358 AM |
10885 | + * |
10886 | + * This program is distributed in the hope that it will be useful, | |
10887 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10888 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10889 | + * GNU General Public License for more details. | |
10890 | + * | |
10891 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 10892 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 10893 | + */ |
10894 | + | |
10895 | +/* | |
10896 | + * directory operations | |
10897 | + */ | |
10898 | + | |
10899 | +#ifndef __AUFS_DIR_H__ | |
10900 | +#define __AUFS_DIR_H__ | |
10901 | + | |
10902 | +#ifdef __KERNEL__ | |
10903 | + | |
10904 | +#include <linux/fs.h> | |
1facf9fc | 10905 | + |
10906 | +/* ---------------------------------------------------------------------- */ | |
10907 | + | |
10908 | +/* need to be faster and smaller */ | |
10909 | + | |
10910 | +struct au_nhash { | |
dece6358 AM |
10911 | + unsigned int nh_num; |
10912 | + struct hlist_head *nh_head; | |
1facf9fc | 10913 | +}; |
10914 | + | |
10915 | +struct au_vdir_destr { | |
10916 | + unsigned char len; | |
10917 | + unsigned char name[0]; | |
10918 | +} __packed; | |
10919 | + | |
10920 | +struct au_vdir_dehstr { | |
10921 | + struct hlist_node hash; | |
1c60b727 | 10922 | + struct au_vdir_destr *str; |
4a4d8108 | 10923 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 10924 | + |
10925 | +struct au_vdir_de { | |
10926 | + ino_t de_ino; | |
10927 | + unsigned char de_type; | |
10928 | + /* caution: packed */ | |
10929 | + struct au_vdir_destr de_str; | |
10930 | +} __packed; | |
10931 | + | |
10932 | +struct au_vdir_wh { | |
10933 | + struct hlist_node wh_hash; | |
dece6358 AM |
10934 | +#ifdef CONFIG_AUFS_SHWH |
10935 | + ino_t wh_ino; | |
1facf9fc | 10936 | + aufs_bindex_t wh_bindex; |
dece6358 AM |
10937 | + unsigned char wh_type; |
10938 | +#else | |
10939 | + aufs_bindex_t wh_bindex; | |
10940 | +#endif | |
10941 | + /* caution: packed */ | |
1facf9fc | 10942 | + struct au_vdir_destr wh_str; |
10943 | +} __packed; | |
10944 | + | |
10945 | +union au_vdir_deblk_p { | |
10946 | + unsigned char *deblk; | |
10947 | + struct au_vdir_de *de; | |
10948 | +}; | |
10949 | + | |
10950 | +struct au_vdir { | |
10951 | + unsigned char **vd_deblk; | |
10952 | + unsigned long vd_nblk; | |
1facf9fc | 10953 | + struct { |
10954 | + unsigned long ul; | |
10955 | + union au_vdir_deblk_p p; | |
10956 | + } vd_last; | |
10957 | + | |
be118d29 | 10958 | + u64 vd_version; |
dece6358 | 10959 | + unsigned int vd_deblk_sz; |
1c60b727 | 10960 | + unsigned long vd_jiffy; |
4a4d8108 | 10961 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 10962 | + |
10963 | +/* ---------------------------------------------------------------------- */ | |
10964 | + | |
10965 | +/* dir.c */ | |
10966 | +extern const struct file_operations aufs_dir_fop; | |
10967 | +void au_add_nlink(struct inode *dir, struct inode *h_dir); | |
10968 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir); | |
1308ab2a | 10969 | +loff_t au_dir_size(struct file *file, struct dentry *dentry); |
b912730e | 10970 | +void au_dir_ts(struct inode *dir, aufs_bindex_t bsrc); |
1facf9fc | 10971 | +int au_test_empty_lower(struct dentry *dentry); |
10972 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist); | |
10973 | + | |
10974 | +/* vdir.c */ | |
1308ab2a | 10975 | +unsigned int au_rdhash_est(loff_t sz); |
dece6358 AM |
10976 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp); |
10977 | +void au_nhash_wh_free(struct au_nhash *whlist); | |
1facf9fc | 10978 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, |
10979 | + int limit); | |
dece6358 AM |
10980 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen); |
10981 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
10982 | + unsigned int d_type, aufs_bindex_t bindex, | |
10983 | + unsigned char shwh); | |
1c60b727 | 10984 | +void au_vdir_free(struct au_vdir *vdir); |
1facf9fc | 10985 | +int au_vdir_init(struct file *file); |
392086de | 10986 | +int au_vdir_fill_de(struct file *file, struct dir_context *ctx); |
1facf9fc | 10987 | + |
10988 | +/* ioctl.c */ | |
10989 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg); | |
10990 | + | |
1308ab2a | 10991 | +#ifdef CONFIG_AUFS_RDU |
10992 | +/* rdu.c */ | |
10993 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
10994 | +#ifdef CONFIG_COMPAT |
10995 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
10996 | + unsigned long arg); | |
10997 | +#endif | |
1308ab2a | 10998 | +#else |
c1595e42 JR |
10999 | +AuStub(long, au_rdu_ioctl, return -EINVAL, struct file *file, |
11000 | + unsigned int cmd, unsigned long arg) | |
b752ccd1 | 11001 | +#ifdef CONFIG_COMPAT |
c1595e42 JR |
11002 | +AuStub(long, au_rdu_compat_ioctl, return -EINVAL, struct file *file, |
11003 | + unsigned int cmd, unsigned long arg) | |
b752ccd1 | 11004 | +#endif |
1308ab2a | 11005 | +#endif |
11006 | + | |
1facf9fc | 11007 | +#endif /* __KERNEL__ */ |
11008 | +#endif /* __AUFS_DIR_H__ */ | |
8b6a4947 AM |
11009 | diff -urN /usr/share/empty/fs/aufs/dirren.c linux/fs/aufs/dirren.c |
11010 | --- /usr/share/empty/fs/aufs/dirren.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 11011 | +++ linux/fs/aufs/dirren.c 2018-08-12 23:43:05.453457863 +0200 |
062440b3 | 11012 | @@ -0,0 +1,1316 @@ |
cd7a4cd9 | 11013 | +// SPDX-License-Identifier: GPL-2.0 |
8b6a4947 | 11014 | +/* |
b00004a5 | 11015 | + * Copyright (C) 2017-2018 Junjiro R. Okajima |
8b6a4947 AM |
11016 | + * |
11017 | + * This program, aufs is free software; you can redistribute it and/or modify | |
11018 | + * it under the terms of the GNU General Public License as published by | |
11019 | + * the Free Software Foundation; either version 2 of the License, or | |
11020 | + * (at your option) any later version. | |
11021 | + * | |
11022 | + * This program is distributed in the hope that it will be useful, | |
11023 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11024 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11025 | + * GNU General Public License for more details. | |
11026 | + * | |
11027 | + * You should have received a copy of the GNU General Public License | |
11028 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
11029 | + */ | |
11030 | + | |
11031 | +/* | |
11032 | + * special handling in renaming a directoy | |
11033 | + * in order to support looking-up the before-renamed name on the lower readonly | |
11034 | + * branches | |
11035 | + */ | |
11036 | + | |
11037 | +#include <linux/byteorder/generic.h> | |
11038 | +#include "aufs.h" | |
11039 | + | |
11040 | +static void au_dr_hino_del(struct au_dr_br *dr, struct au_dr_hino *ent) | |
11041 | +{ | |
11042 | + int idx; | |
11043 | + | |
11044 | + idx = au_dr_ihash(ent->dr_h_ino); | |
11045 | + au_hbl_del(&ent->dr_hnode, dr->dr_h_ino + idx); | |
11046 | +} | |
11047 | + | |
11048 | +static int au_dr_hino_test_empty(struct au_dr_br *dr) | |
11049 | +{ | |
11050 | + int ret, i; | |
11051 | + struct hlist_bl_head *hbl; | |
11052 | + | |
11053 | + ret = 1; | |
11054 | + for (i = 0; ret && i < AuDirren_NHASH; i++) { | |
11055 | + hbl = dr->dr_h_ino + i; | |
11056 | + hlist_bl_lock(hbl); | |
11057 | + ret &= hlist_bl_empty(hbl); | |
11058 | + hlist_bl_unlock(hbl); | |
11059 | + } | |
11060 | + | |
11061 | + return ret; | |
11062 | +} | |
11063 | + | |
11064 | +static struct au_dr_hino *au_dr_hino_find(struct au_dr_br *dr, ino_t ino) | |
11065 | +{ | |
11066 | + struct au_dr_hino *found, *ent; | |
11067 | + struct hlist_bl_head *hbl; | |
11068 | + struct hlist_bl_node *pos; | |
11069 | + int idx; | |
11070 | + | |
11071 | + found = NULL; | |
11072 | + idx = au_dr_ihash(ino); | |
11073 | + hbl = dr->dr_h_ino + idx; | |
11074 | + hlist_bl_lock(hbl); | |
11075 | + hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) | |
11076 | + if (ent->dr_h_ino == ino) { | |
11077 | + found = ent; | |
11078 | + break; | |
11079 | + } | |
11080 | + hlist_bl_unlock(hbl); | |
11081 | + | |
11082 | + return found; | |
11083 | +} | |
11084 | + | |
11085 | +int au_dr_hino_test_add(struct au_dr_br *dr, ino_t ino, | |
11086 | + struct au_dr_hino *add_ent) | |
11087 | +{ | |
11088 | + int found, idx; | |
11089 | + struct hlist_bl_head *hbl; | |
11090 | + struct hlist_bl_node *pos; | |
11091 | + struct au_dr_hino *ent; | |
11092 | + | |
11093 | + found = 0; | |
11094 | + idx = au_dr_ihash(ino); | |
11095 | + hbl = dr->dr_h_ino + idx; | |
11096 | +#if 0 | |
11097 | + { | |
11098 | + struct hlist_bl_node *tmp; | |
11099 | + | |
11100 | + hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) | |
11101 | + AuDbg("hi%llu\n", (unsigned long long)ent->dr_h_ino); | |
11102 | + } | |
11103 | +#endif | |
11104 | + hlist_bl_lock(hbl); | |
11105 | + hlist_bl_for_each_entry(ent, pos, hbl, dr_hnode) | |
11106 | + if (ent->dr_h_ino == ino) { | |
11107 | + found = 1; | |
11108 | + break; | |
11109 | + } | |
11110 | + if (!found && add_ent) | |
11111 | + hlist_bl_add_head(&add_ent->dr_hnode, hbl); | |
11112 | + hlist_bl_unlock(hbl); | |
11113 | + | |
11114 | + if (!found && add_ent) | |
11115 | + AuDbg("i%llu added\n", (unsigned long long)add_ent->dr_h_ino); | |
11116 | + | |
11117 | + return found; | |
11118 | +} | |
11119 | + | |
11120 | +void au_dr_hino_free(struct au_dr_br *dr) | |
11121 | +{ | |
11122 | + int i; | |
11123 | + struct hlist_bl_head *hbl; | |
11124 | + struct hlist_bl_node *pos, *tmp; | |
11125 | + struct au_dr_hino *ent; | |
11126 | + | |
11127 | + /* SiMustWriteLock(sb); */ | |
11128 | + | |
11129 | + for (i = 0; i < AuDirren_NHASH; i++) { | |
11130 | + hbl = dr->dr_h_ino + i; | |
11131 | + /* no spinlock since sbinfo must be write-locked */ | |
11132 | + hlist_bl_for_each_entry_safe(ent, pos, tmp, hbl, dr_hnode) | |
11133 | + kfree(ent); | |
11134 | + INIT_HLIST_BL_HEAD(hbl); | |
11135 | + } | |
11136 | +} | |
11137 | + | |
11138 | +/* returns the number of inodes or an error */ | |
11139 | +static int au_dr_hino_store(struct super_block *sb, struct au_branch *br, | |
11140 | + struct file *hinofile) | |
11141 | +{ | |
11142 | + int err, i; | |
11143 | + ssize_t ssz; | |
11144 | + loff_t pos, oldsize; | |
11145 | + __be64 u64; | |
11146 | + struct inode *hinoinode; | |
11147 | + struct hlist_bl_head *hbl; | |
11148 | + struct hlist_bl_node *n1, *n2; | |
11149 | + struct au_dr_hino *ent; | |
11150 | + | |
11151 | + SiMustWriteLock(sb); | |
11152 | + AuDebugOn(!au_br_writable(br->br_perm)); | |
11153 | + | |
11154 | + hinoinode = file_inode(hinofile); | |
11155 | + oldsize = i_size_read(hinoinode); | |
11156 | + | |
11157 | + err = 0; | |
11158 | + pos = 0; | |
11159 | + hbl = br->br_dirren.dr_h_ino; | |
11160 | + for (i = 0; !err && i < AuDirren_NHASH; i++, hbl++) { | |
11161 | + /* no bit-lock since sbinfo must be write-locked */ | |
11162 | + hlist_bl_for_each_entry_safe(ent, n1, n2, hbl, dr_hnode) { | |
11163 | + AuDbg("hi%llu, %pD2\n", | |
11164 | + (unsigned long long)ent->dr_h_ino, hinofile); | |
11165 | + u64 = cpu_to_be64(ent->dr_h_ino); | |
11166 | + ssz = vfsub_write_k(hinofile, &u64, sizeof(u64), &pos); | |
11167 | + if (ssz == sizeof(u64)) | |
11168 | + continue; | |
11169 | + | |
11170 | + /* write error */ | |
11171 | + pr_err("ssz %zd, %pD2\n", ssz, hinofile); | |
11172 | + err = -ENOSPC; | |
11173 | + if (ssz < 0) | |
11174 | + err = ssz; | |
11175 | + break; | |
11176 | + } | |
11177 | + } | |
11178 | + /* regardless the error */ | |
11179 | + if (pos < oldsize) { | |
11180 | + err = vfsub_trunc(&hinofile->f_path, pos, /*attr*/0, hinofile); | |
11181 | + AuTraceErr(err); | |
11182 | + } | |
11183 | + | |
11184 | + AuTraceErr(err); | |
11185 | + return err; | |
11186 | +} | |
11187 | + | |
11188 | +static int au_dr_hino_load(struct au_dr_br *dr, struct file *hinofile) | |
11189 | +{ | |
11190 | + int err, hidx; | |
11191 | + ssize_t ssz; | |
11192 | + size_t sz, n; | |
11193 | + loff_t pos; | |
11194 | + uint64_t u64; | |
11195 | + struct au_dr_hino *ent; | |
11196 | + struct inode *hinoinode; | |
11197 | + struct hlist_bl_head *hbl; | |
11198 | + | |
11199 | + err = 0; | |
11200 | + pos = 0; | |
11201 | + hbl = dr->dr_h_ino; | |
11202 | + hinoinode = file_inode(hinofile); | |
11203 | + sz = i_size_read(hinoinode); | |
11204 | + AuDebugOn(sz % sizeof(u64)); | |
11205 | + n = sz / sizeof(u64); | |
11206 | + while (n--) { | |
11207 | + ssz = vfsub_read_k(hinofile, &u64, sizeof(u64), &pos); | |
11208 | + if (unlikely(ssz != sizeof(u64))) { | |
11209 | + pr_err("ssz %zd, %pD2\n", ssz, hinofile); | |
11210 | + err = -EINVAL; | |
11211 | + if (ssz < 0) | |
11212 | + err = ssz; | |
11213 | + goto out_free; | |
11214 | + } | |
11215 | + | |
11216 | + ent = kmalloc(sizeof(*ent), GFP_NOFS); | |
11217 | + if (!ent) { | |
11218 | + err = -ENOMEM; | |
11219 | + AuTraceErr(err); | |
11220 | + goto out_free; | |
11221 | + } | |
11222 | + ent->dr_h_ino = be64_to_cpu((__force __be64)u64); | |
11223 | + AuDbg("hi%llu, %pD2\n", | |
11224 | + (unsigned long long)ent->dr_h_ino, hinofile); | |
11225 | + hidx = au_dr_ihash(ent->dr_h_ino); | |
11226 | + au_hbl_add(&ent->dr_hnode, hbl + hidx); | |
11227 | + } | |
11228 | + goto out; /* success */ | |
11229 | + | |
11230 | +out_free: | |
11231 | + au_dr_hino_free(dr); | |
11232 | +out: | |
11233 | + AuTraceErr(err); | |
11234 | + return err; | |
11235 | +} | |
11236 | + | |
11237 | +/* | |
11238 | + * @bindex/@br is a switch to distinguish whether suspending hnotify or not. | |
11239 | + * @path is a switch to distinguish load and store. | |
11240 | + */ | |
11241 | +static int au_dr_hino(struct super_block *sb, aufs_bindex_t bindex, | |
11242 | + struct au_branch *br, const struct path *path) | |
11243 | +{ | |
11244 | + int err, flags; | |
11245 | + unsigned char load, suspend; | |
11246 | + struct file *hinofile; | |
11247 | + struct au_hinode *hdir; | |
11248 | + struct inode *dir, *delegated; | |
11249 | + struct path hinopath; | |
11250 | + struct qstr hinoname = QSTR_INIT(AUFS_WH_DR_BRHINO, | |
11251 | + sizeof(AUFS_WH_DR_BRHINO) - 1); | |
11252 | + | |
11253 | + AuDebugOn(bindex < 0 && !br); | |
11254 | + AuDebugOn(bindex >= 0 && br); | |
11255 | + | |
11256 | + err = -EINVAL; | |
11257 | + suspend = !br; | |
11258 | + if (suspend) | |
11259 | + br = au_sbr(sb, bindex); | |
11260 | + load = !!path; | |
11261 | + if (!load) { | |
11262 | + path = &br->br_path; | |
11263 | + AuDebugOn(!au_br_writable(br->br_perm)); | |
11264 | + if (unlikely(!au_br_writable(br->br_perm))) | |
11265 | + goto out; | |
11266 | + } | |
11267 | + | |
11268 | + hdir = NULL; | |
11269 | + if (suspend) { | |
11270 | + dir = d_inode(sb->s_root); | |
11271 | + hdir = au_hinode(au_ii(dir), bindex); | |
11272 | + dir = hdir->hi_inode; | |
11273 | + au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); | |
11274 | + } else { | |
11275 | + dir = d_inode(path->dentry); | |
11276 | + inode_lock_nested(dir, AuLsc_I_CHILD); | |
11277 | + } | |
11278 | + hinopath.dentry = vfsub_lkup_one(&hinoname, path->dentry); | |
11279 | + err = PTR_ERR(hinopath.dentry); | |
11280 | + if (IS_ERR(hinopath.dentry)) | |
11281 | + goto out_unlock; | |
11282 | + | |
11283 | + err = 0; | |
11284 | + flags = O_RDONLY; | |
11285 | + if (load) { | |
11286 | + if (d_is_negative(hinopath.dentry)) | |
11287 | + goto out_dput; /* success */ | |
11288 | + } else { | |
11289 | + if (au_dr_hino_test_empty(&br->br_dirren)) { | |
11290 | + if (d_is_positive(hinopath.dentry)) { | |
11291 | + delegated = NULL; | |
11292 | + err = vfsub_unlink(dir, &hinopath, &delegated, | |
11293 | + /*force*/0); | |
11294 | + AuTraceErr(err); | |
11295 | + if (unlikely(err)) | |
11296 | + pr_err("ignored err %d, %pd2\n", | |
11297 | + err, hinopath.dentry); | |
11298 | + if (unlikely(err == -EWOULDBLOCK)) | |
11299 | + iput(delegated); | |
11300 | + err = 0; | |
11301 | + } | |
11302 | + goto out_dput; | |
11303 | + } else if (!d_is_positive(hinopath.dentry)) { | |
11304 | + err = vfsub_create(dir, &hinopath, 0600, | |
11305 | + /*want_excl*/false); | |
11306 | + AuTraceErr(err); | |
11307 | + if (unlikely(err)) | |
11308 | + goto out_dput; | |
11309 | + } | |
11310 | + flags = O_WRONLY; | |
11311 | + } | |
11312 | + hinopath.mnt = path->mnt; | |
11313 | + hinofile = vfsub_dentry_open(&hinopath, flags); | |
11314 | + if (suspend) | |
11315 | + au_hn_inode_unlock(hdir); | |
11316 | + else | |
11317 | + inode_unlock(dir); | |
11318 | + dput(hinopath.dentry); | |
11319 | + AuTraceErrPtr(hinofile); | |
11320 | + if (IS_ERR(hinofile)) { | |
11321 | + err = PTR_ERR(hinofile); | |
11322 | + goto out; | |
11323 | + } | |
11324 | + | |
11325 | + if (load) | |
11326 | + err = au_dr_hino_load(&br->br_dirren, hinofile); | |
11327 | + else | |
11328 | + err = au_dr_hino_store(sb, br, hinofile); | |
11329 | + fput(hinofile); | |
11330 | + goto out; | |
11331 | + | |
11332 | +out_dput: | |
11333 | + dput(hinopath.dentry); | |
11334 | +out_unlock: | |
11335 | + if (suspend) | |
11336 | + au_hn_inode_unlock(hdir); | |
11337 | + else | |
11338 | + inode_unlock(dir); | |
11339 | +out: | |
11340 | + AuTraceErr(err); | |
11341 | + return err; | |
11342 | +} | |
11343 | + | |
11344 | +/* ---------------------------------------------------------------------- */ | |
11345 | + | |
11346 | +static int au_dr_brid_init(struct au_dr_brid *brid, const struct path *path) | |
11347 | +{ | |
11348 | + int err; | |
11349 | + struct kstatfs kstfs; | |
11350 | + dev_t dev; | |
11351 | + struct dentry *dentry; | |
11352 | + struct super_block *sb; | |
11353 | + | |
11354 | + err = vfs_statfs((void *)path, &kstfs); | |
11355 | + AuTraceErr(err); | |
11356 | + if (unlikely(err)) | |
11357 | + goto out; | |
11358 | + | |
11359 | + /* todo: support for UUID */ | |
11360 | + | |
11361 | + if (kstfs.f_fsid.val[0] || kstfs.f_fsid.val[1]) { | |
11362 | + brid->type = AuBrid_FSID; | |
11363 | + brid->fsid = kstfs.f_fsid; | |
11364 | + } else { | |
11365 | + dentry = path->dentry; | |
11366 | + sb = dentry->d_sb; | |
11367 | + dev = sb->s_dev; | |
11368 | + if (dev) { | |
11369 | + brid->type = AuBrid_DEV; | |
11370 | + brid->dev = dev; | |
11371 | + } | |
11372 | + } | |
11373 | + | |
11374 | +out: | |
11375 | + return err; | |
11376 | +} | |
11377 | + | |
11378 | +int au_dr_br_init(struct super_block *sb, struct au_branch *br, | |
11379 | + const struct path *path) | |
11380 | +{ | |
11381 | + int err, i; | |
11382 | + struct au_dr_br *dr; | |
11383 | + struct hlist_bl_head *hbl; | |
11384 | + | |
11385 | + dr = &br->br_dirren; | |
11386 | + hbl = dr->dr_h_ino; | |
11387 | + for (i = 0; i < AuDirren_NHASH; i++, hbl++) | |
11388 | + INIT_HLIST_BL_HEAD(hbl); | |
11389 | + | |
11390 | + err = au_dr_brid_init(&dr->dr_brid, path); | |
11391 | + if (unlikely(err)) | |
11392 | + goto out; | |
11393 | + | |
11394 | + if (au_opt_test(au_mntflags(sb), DIRREN)) | |
11395 | + err = au_dr_hino(sb, /*bindex*/-1, br, path); | |
11396 | + | |
11397 | +out: | |
11398 | + AuTraceErr(err); | |
11399 | + return err; | |
11400 | +} | |
11401 | + | |
11402 | +int au_dr_br_fin(struct super_block *sb, struct au_branch *br) | |
11403 | +{ | |
11404 | + int err; | |
11405 | + | |
11406 | + err = 0; | |
11407 | + if (au_br_writable(br->br_perm)) | |
11408 | + err = au_dr_hino(sb, /*bindex*/-1, br, /*path*/NULL); | |
11409 | + if (!err) | |
11410 | + au_dr_hino_free(&br->br_dirren); | |
11411 | + | |
11412 | + return err; | |
11413 | +} | |
11414 | + | |
11415 | +/* ---------------------------------------------------------------------- */ | |
11416 | + | |
11417 | +static int au_brid_str(struct au_dr_brid *brid, struct inode *h_inode, | |
11418 | + char *buf, size_t sz) | |
11419 | +{ | |
11420 | + int err; | |
11421 | + unsigned int major, minor; | |
11422 | + char *p; | |
11423 | + | |
11424 | + p = buf; | |
11425 | + err = snprintf(p, sz, "%d_", brid->type); | |
11426 | + AuDebugOn(err > sz); | |
11427 | + p += err; | |
11428 | + sz -= err; | |
11429 | + switch (brid->type) { | |
11430 | + case AuBrid_Unset: | |
11431 | + return -EINVAL; | |
11432 | + case AuBrid_UUID: | |
11433 | + err = snprintf(p, sz, "%pU", brid->uuid.b); | |
11434 | + break; | |
11435 | + case AuBrid_FSID: | |
11436 | + err = snprintf(p, sz, "%08x-%08x", | |
11437 | + brid->fsid.val[0], brid->fsid.val[1]); | |
11438 | + break; | |
11439 | + case AuBrid_DEV: | |
11440 | + major = MAJOR(brid->dev); | |
11441 | + minor = MINOR(brid->dev); | |
11442 | + if (major <= 0xff && minor <= 0xff) | |
11443 | + err = snprintf(p, sz, "%02x%02x", major, minor); | |
11444 | + else | |
11445 | + err = snprintf(p, sz, "%03x:%05x", major, minor); | |
11446 | + break; | |
11447 | + } | |
11448 | + AuDebugOn(err > sz); | |
11449 | + p += err; | |
11450 | + sz -= err; | |
11451 | + err = snprintf(p, sz, "_%llu", (unsigned long long)h_inode->i_ino); | |
11452 | + AuDebugOn(err > sz); | |
11453 | + p += err; | |
11454 | + sz -= err; | |
11455 | + | |
11456 | + return p - buf; | |
11457 | +} | |
11458 | + | |
11459 | +static int au_drinfo_name(struct au_branch *br, char *name, int len) | |
11460 | +{ | |
11461 | + int rlen; | |
11462 | + struct dentry *br_dentry; | |
11463 | + struct inode *br_inode; | |
11464 | + | |
11465 | + br_dentry = au_br_dentry(br); | |
11466 | + br_inode = d_inode(br_dentry); | |
11467 | + rlen = au_brid_str(&br->br_dirren.dr_brid, br_inode, name, len); | |
11468 | + AuDebugOn(rlen >= AUFS_DIRREN_ENV_VAL_SZ); | |
11469 | + AuDebugOn(rlen > len); | |
11470 | + | |
11471 | + return rlen; | |
11472 | +} | |
11473 | + | |
11474 | +/* ---------------------------------------------------------------------- */ | |
11475 | + | |
11476 | +/* | |
11477 | + * from the given @h_dentry, construct drinfo at @*fdata. | |
11478 | + * when the size of @*fdata is not enough, reallocate and return new @fdata and | |
11479 | + * @allocated. | |
11480 | + */ | |
11481 | +static int au_drinfo_construct(struct au_drinfo_fdata **fdata, | |
11482 | + struct dentry *h_dentry, | |
11483 | + unsigned char *allocated) | |
11484 | +{ | |
11485 | + int err, v; | |
11486 | + struct au_drinfo_fdata *f, *p; | |
11487 | + struct au_drinfo *drinfo; | |
11488 | + struct inode *h_inode; | |
11489 | + struct qstr *qname; | |
11490 | + | |
11491 | + err = 0; | |
11492 | + f = *fdata; | |
11493 | + h_inode = d_inode(h_dentry); | |
11494 | + qname = &h_dentry->d_name; | |
11495 | + drinfo = &f->drinfo; | |
11496 | + drinfo->ino = (__force uint64_t)cpu_to_be64(h_inode->i_ino); | |
11497 | + drinfo->oldnamelen = qname->len; | |
11498 | + if (*allocated < sizeof(*f) + qname->len) { | |
11499 | + v = roundup_pow_of_two(*allocated + qname->len); | |
11500 | + p = au_krealloc(f, v, GFP_NOFS, /*may_shrink*/0); | |
11501 | + if (unlikely(!p)) { | |
11502 | + err = -ENOMEM; | |
11503 | + AuTraceErr(err); | |
11504 | + goto out; | |
11505 | + } | |
11506 | + f = p; | |
11507 | + *fdata = f; | |
11508 | + *allocated = v; | |
11509 | + drinfo = &f->drinfo; | |
11510 | + } | |
11511 | + memcpy(drinfo->oldname, qname->name, qname->len); | |
11512 | + AuDbg("i%llu, %.*s\n", | |
11513 | + be64_to_cpu((__force __be64)drinfo->ino), drinfo->oldnamelen, | |
11514 | + drinfo->oldname); | |
11515 | + | |
11516 | +out: | |
11517 | + AuTraceErr(err); | |
11518 | + return err; | |
11519 | +} | |
11520 | + | |
11521 | +/* callers have to free the return value */ | |
11522 | +static struct au_drinfo *au_drinfo_read_k(struct file *file, ino_t h_ino) | |
11523 | +{ | |
11524 | + struct au_drinfo *ret, *drinfo; | |
11525 | + struct au_drinfo_fdata fdata; | |
11526 | + int len; | |
11527 | + loff_t pos; | |
11528 | + ssize_t ssz; | |
11529 | + | |
11530 | + ret = ERR_PTR(-EIO); | |
11531 | + pos = 0; | |
11532 | + ssz = vfsub_read_k(file, &fdata, sizeof(fdata), &pos); | |
11533 | + if (unlikely(ssz != sizeof(fdata))) { | |
11534 | + AuIOErr("ssz %zd, %u, %pD2\n", | |
11535 | + ssz, (unsigned int)sizeof(fdata), file); | |
11536 | + goto out; | |
11537 | + } | |
11538 | + | |
11539 | + fdata.magic = ntohl((__force __be32)fdata.magic); | |
11540 | + switch (fdata.magic) { | |
11541 | + case AUFS_DRINFO_MAGIC_V1: | |
11542 | + break; | |
11543 | + default: | |
11544 | + AuIOErr("magic-num 0x%x, 0x%x, %pD2\n", | |
11545 | + fdata.magic, AUFS_DRINFO_MAGIC_V1, file); | |
11546 | + goto out; | |
11547 | + } | |
11548 | + | |
11549 | + drinfo = &fdata.drinfo; | |
11550 | + len = drinfo->oldnamelen; | |
11551 | + if (!len) { | |
11552 | + AuIOErr("broken drinfo %pD2\n", file); | |
11553 | + goto out; | |
11554 | + } | |
11555 | + | |
11556 | + ret = NULL; | |
11557 | + drinfo->ino = be64_to_cpu((__force __be64)drinfo->ino); | |
11558 | + if (unlikely(h_ino && drinfo->ino != h_ino)) { | |
11559 | + AuDbg("ignored i%llu, i%llu, %pD2\n", | |
11560 | + (unsigned long long)drinfo->ino, | |
11561 | + (unsigned long long)h_ino, file); | |
11562 | + goto out; /* success */ | |
11563 | + } | |
11564 | + | |
11565 | + ret = kmalloc(sizeof(*ret) + len, GFP_NOFS); | |
11566 | + if (unlikely(!ret)) { | |
11567 | + ret = ERR_PTR(-ENOMEM); | |
11568 | + AuTraceErrPtr(ret); | |
11569 | + goto out; | |
11570 | + } | |
11571 | + | |
11572 | + *ret = *drinfo; | |
11573 | + ssz = vfsub_read_k(file, (void *)ret->oldname, len, &pos); | |
11574 | + if (unlikely(ssz != len)) { | |
11575 | + kfree(ret); | |
11576 | + ret = ERR_PTR(-EIO); | |
11577 | + AuIOErr("ssz %zd, %u, %pD2\n", ssz, len, file); | |
11578 | + goto out; | |
11579 | + } | |
11580 | + | |
11581 | + AuDbg("oldname %.*s\n", ret->oldnamelen, ret->oldname); | |
11582 | + | |
11583 | +out: | |
11584 | + return ret; | |
11585 | +} | |
11586 | + | |
11587 | +/* ---------------------------------------------------------------------- */ | |
11588 | + | |
11589 | +/* in order to be revertible */ | |
11590 | +struct au_drinfo_rev_elm { | |
11591 | + int created; | |
11592 | + struct dentry *info_dentry; | |
11593 | + struct au_drinfo *info_last; | |
11594 | +}; | |
11595 | + | |
11596 | +struct au_drinfo_rev { | |
11597 | + unsigned char already; | |
11598 | + aufs_bindex_t nelm; | |
11599 | + struct au_drinfo_rev_elm elm[0]; | |
11600 | +}; | |
11601 | + | |
11602 | +/* todo: isn't it too large? */ | |
11603 | +struct au_drinfo_store { | |
11604 | + struct path h_ppath; | |
11605 | + struct dentry *h_dentry; | |
11606 | + struct au_drinfo_fdata *fdata; | |
11607 | + char *infoname; /* inside of whname, just after PFX */ | |
11608 | + char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ]; | |
11609 | + aufs_bindex_t btgt, btail; | |
11610 | + unsigned char no_sio, | |
11611 | + allocated, /* current size of *fdata */ | |
11612 | + infonamelen, /* room size for p */ | |
11613 | + whnamelen, /* length of the genarated name */ | |
11614 | + renameback; /* renamed back */ | |
11615 | +}; | |
11616 | + | |
11617 | +/* on rename(2) error, the caller should revert it using @elm */ | |
11618 | +static int au_drinfo_do_store(struct au_drinfo_store *w, | |
11619 | + struct au_drinfo_rev_elm *elm) | |
11620 | +{ | |
11621 | + int err, len; | |
11622 | + ssize_t ssz; | |
11623 | + loff_t pos; | |
11624 | + struct path infopath = { | |
11625 | + .mnt = w->h_ppath.mnt | |
11626 | + }; | |
11627 | + struct inode *h_dir, *h_inode, *delegated; | |
11628 | + struct file *infofile; | |
11629 | + struct qstr *qname; | |
11630 | + | |
11631 | + AuDebugOn(elm | |
11632 | + && memcmp(elm, page_address(ZERO_PAGE(0)), sizeof(*elm))); | |
11633 | + | |
11634 | + infopath.dentry = vfsub_lookup_one_len(w->whname, w->h_ppath.dentry, | |
11635 | + w->whnamelen); | |
11636 | + AuTraceErrPtr(infopath.dentry); | |
11637 | + if (IS_ERR(infopath.dentry)) { | |
11638 | + err = PTR_ERR(infopath.dentry); | |
11639 | + goto out; | |
11640 | + } | |
11641 | + | |
11642 | + err = 0; | |
11643 | + h_dir = d_inode(w->h_ppath.dentry); | |
11644 | + if (elm && d_is_negative(infopath.dentry)) { | |
11645 | + err = vfsub_create(h_dir, &infopath, 0600, /*want_excl*/true); | |
11646 | + AuTraceErr(err); | |
11647 | + if (unlikely(err)) | |
11648 | + goto out_dput; | |
11649 | + elm->created = 1; | |
11650 | + elm->info_dentry = dget(infopath.dentry); | |
11651 | + } | |
11652 | + | |
11653 | + infofile = vfsub_dentry_open(&infopath, O_RDWR); | |
11654 | + AuTraceErrPtr(infofile); | |
11655 | + if (IS_ERR(infofile)) { | |
11656 | + err = PTR_ERR(infofile); | |
11657 | + goto out_dput; | |
11658 | + } | |
11659 | + | |
11660 | + h_inode = d_inode(infopath.dentry); | |
11661 | + if (elm && i_size_read(h_inode)) { | |
11662 | + h_inode = d_inode(w->h_dentry); | |
11663 | + elm->info_last = au_drinfo_read_k(infofile, h_inode->i_ino); | |
11664 | + AuTraceErrPtr(elm->info_last); | |
11665 | + if (IS_ERR(elm->info_last)) { | |
11666 | + err = PTR_ERR(elm->info_last); | |
11667 | + elm->info_last = NULL; | |
11668 | + AuDebugOn(elm->info_dentry); | |
11669 | + goto out_fput; | |
11670 | + } | |
11671 | + } | |
11672 | + | |
11673 | + if (elm && w->renameback) { | |
11674 | + delegated = NULL; | |
11675 | + err = vfsub_unlink(h_dir, &infopath, &delegated, /*force*/0); | |
11676 | + AuTraceErr(err); | |
11677 | + if (unlikely(err == -EWOULDBLOCK)) | |
11678 | + iput(delegated); | |
11679 | + goto out_fput; | |
11680 | + } | |
11681 | + | |
11682 | + pos = 0; | |
11683 | + qname = &w->h_dentry->d_name; | |
11684 | + len = sizeof(*w->fdata) + qname->len; | |
11685 | + if (!elm) | |
11686 | + len = sizeof(*w->fdata) + w->fdata->drinfo.oldnamelen; | |
11687 | + ssz = vfsub_write_k(infofile, w->fdata, len, &pos); | |
11688 | + if (ssz == len) { | |
11689 | + AuDbg("hi%llu, %.*s\n", w->fdata->drinfo.ino, | |
11690 | + w->fdata->drinfo.oldnamelen, w->fdata->drinfo.oldname); | |
11691 | + goto out_fput; /* success */ | |
11692 | + } else { | |
11693 | + err = -EIO; | |
11694 | + if (ssz < 0) | |
11695 | + err = ssz; | |
11696 | + /* the caller should revert it using @elm */ | |
11697 | + } | |
11698 | + | |
11699 | +out_fput: | |
11700 | + fput(infofile); | |
11701 | +out_dput: | |
11702 | + dput(infopath.dentry); | |
11703 | +out: | |
11704 | + AuTraceErr(err); | |
11705 | + return err; | |
11706 | +} | |
11707 | + | |
11708 | +struct au_call_drinfo_do_store_args { | |
11709 | + int *errp; | |
11710 | + struct au_drinfo_store *w; | |
11711 | + struct au_drinfo_rev_elm *elm; | |
11712 | +}; | |
11713 | + | |
11714 | +static void au_call_drinfo_do_store(void *args) | |
11715 | +{ | |
11716 | + struct au_call_drinfo_do_store_args *a = args; | |
11717 | + | |
11718 | + *a->errp = au_drinfo_do_store(a->w, a->elm); | |
11719 | +} | |
11720 | + | |
11721 | +static int au_drinfo_store_sio(struct au_drinfo_store *w, | |
11722 | + struct au_drinfo_rev_elm *elm) | |
11723 | +{ | |
11724 | + int err, wkq_err; | |
11725 | + | |
11726 | + if (w->no_sio) | |
11727 | + err = au_drinfo_do_store(w, elm); | |
11728 | + else { | |
11729 | + struct au_call_drinfo_do_store_args a = { | |
11730 | + .errp = &err, | |
11731 | + .w = w, | |
11732 | + .elm = elm | |
11733 | + }; | |
11734 | + wkq_err = au_wkq_wait(au_call_drinfo_do_store, &a); | |
11735 | + if (unlikely(wkq_err)) | |
11736 | + err = wkq_err; | |
11737 | + } | |
11738 | + AuTraceErr(err); | |
11739 | + | |
11740 | + return err; | |
11741 | +} | |
11742 | + | |
11743 | +static int au_drinfo_store_work_init(struct au_drinfo_store *w, | |
11744 | + aufs_bindex_t btgt) | |
11745 | +{ | |
11746 | + int err; | |
11747 | + | |
11748 | + memset(w, 0, sizeof(*w)); | |
11749 | + w->allocated = roundup_pow_of_two(sizeof(*w->fdata) + 40); | |
11750 | + strcpy(w->whname, AUFS_WH_DR_INFO_PFX); | |
11751 | + w->infoname = w->whname + sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
11752 | + w->infonamelen = sizeof(w->whname) - sizeof(AUFS_WH_DR_INFO_PFX); | |
11753 | + w->btgt = btgt; | |
11754 | + w->no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); | |
11755 | + | |
11756 | + err = -ENOMEM; | |
11757 | + w->fdata = kcalloc(1, w->allocated, GFP_NOFS); | |
11758 | + if (unlikely(!w->fdata)) { | |
11759 | + AuTraceErr(err); | |
11760 | + goto out; | |
11761 | + } | |
11762 | + w->fdata->magic = (__force uint32_t)htonl(AUFS_DRINFO_MAGIC_V1); | |
11763 | + err = 0; | |
11764 | + | |
11765 | +out: | |
11766 | + return err; | |
11767 | +} | |
11768 | + | |
11769 | +static void au_drinfo_store_work_fin(struct au_drinfo_store *w) | |
11770 | +{ | |
11771 | + kfree(w->fdata); | |
11772 | +} | |
11773 | + | |
11774 | +static void au_drinfo_store_rev(struct au_drinfo_rev *rev, | |
11775 | + struct au_drinfo_store *w) | |
11776 | +{ | |
11777 | + struct au_drinfo_rev_elm *elm; | |
11778 | + struct inode *h_dir, *delegated; | |
11779 | + int err, nelm; | |
11780 | + struct path infopath = { | |
11781 | + .mnt = w->h_ppath.mnt | |
11782 | + }; | |
11783 | + | |
11784 | + h_dir = d_inode(w->h_ppath.dentry); | |
11785 | + IMustLock(h_dir); | |
11786 | + | |
11787 | + err = 0; | |
11788 | + elm = rev->elm; | |
11789 | + for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { | |
11790 | + AuDebugOn(elm->created && elm->info_last); | |
11791 | + if (elm->created) { | |
11792 | + AuDbg("here\n"); | |
11793 | + delegated = NULL; | |
11794 | + infopath.dentry = elm->info_dentry; | |
11795 | + err = vfsub_unlink(h_dir, &infopath, &delegated, | |
11796 | + !w->no_sio); | |
11797 | + AuTraceErr(err); | |
11798 | + if (unlikely(err == -EWOULDBLOCK)) | |
11799 | + iput(delegated); | |
11800 | + dput(elm->info_dentry); | |
11801 | + } else if (elm->info_last) { | |
11802 | + AuDbg("here\n"); | |
11803 | + w->fdata->drinfo = *elm->info_last; | |
11804 | + memcpy(w->fdata->drinfo.oldname, | |
11805 | + elm->info_last->oldname, | |
11806 | + elm->info_last->oldnamelen); | |
11807 | + err = au_drinfo_store_sio(w, /*elm*/NULL); | |
11808 | + kfree(elm->info_last); | |
11809 | + } | |
11810 | + if (unlikely(err)) | |
11811 | + AuIOErr("%d, %s\n", err, w->whname); | |
11812 | + /* go on even if err */ | |
11813 | + } | |
11814 | +} | |
11815 | + | |
11816 | +/* caller has to call au_dr_rename_fin() later */ | |
11817 | +static int au_drinfo_store(struct dentry *dentry, aufs_bindex_t btgt, | |
11818 | + struct qstr *dst_name, void *_rev) | |
11819 | +{ | |
11820 | + int err, sz, nelm; | |
11821 | + aufs_bindex_t bindex, btail; | |
11822 | + struct au_drinfo_store work; | |
11823 | + struct au_drinfo_rev *rev, **p; | |
11824 | + struct au_drinfo_rev_elm *elm; | |
11825 | + struct super_block *sb; | |
11826 | + struct au_branch *br; | |
11827 | + struct au_hinode *hdir; | |
11828 | + | |
11829 | + err = au_drinfo_store_work_init(&work, btgt); | |
11830 | + AuTraceErr(err); | |
11831 | + if (unlikely(err)) | |
11832 | + goto out; | |
11833 | + | |
11834 | + err = -ENOMEM; | |
11835 | + btail = au_dbtaildir(dentry); | |
11836 | + nelm = btail - btgt; | |
11837 | + sz = sizeof(*rev) + sizeof(*elm) * nelm; | |
11838 | + rev = kcalloc(1, sz, GFP_NOFS); | |
11839 | + if (unlikely(!rev)) { | |
11840 | + AuTraceErr(err); | |
11841 | + goto out_args; | |
11842 | + } | |
11843 | + rev->nelm = nelm; | |
11844 | + elm = rev->elm; | |
11845 | + p = _rev; | |
11846 | + *p = rev; | |
11847 | + | |
11848 | + err = 0; | |
11849 | + sb = dentry->d_sb; | |
11850 | + work.h_ppath.dentry = au_h_dptr(dentry, btgt); | |
11851 | + work.h_ppath.mnt = au_sbr_mnt(sb, btgt); | |
11852 | + hdir = au_hi(d_inode(dentry), btgt); | |
11853 | + au_hn_inode_lock_nested(hdir, AuLsc_I_CHILD); | |
11854 | + for (bindex = btgt + 1; bindex <= btail; bindex++, elm++) { | |
11855 | + work.h_dentry = au_h_dptr(dentry, bindex); | |
11856 | + if (!work.h_dentry) | |
11857 | + continue; | |
11858 | + | |
11859 | + err = au_drinfo_construct(&work.fdata, work.h_dentry, | |
11860 | + &work.allocated); | |
11861 | + AuTraceErr(err); | |
11862 | + if (unlikely(err)) | |
11863 | + break; | |
11864 | + | |
11865 | + work.renameback = au_qstreq(&work.h_dentry->d_name, dst_name); | |
11866 | + br = au_sbr(sb, bindex); | |
11867 | + work.whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
11868 | + work.whnamelen += au_drinfo_name(br, work.infoname, | |
11869 | + work.infonamelen); | |
11870 | + AuDbg("whname %.*s, i%llu, %.*s\n", | |
11871 | + work.whnamelen, work.whname, | |
11872 | + be64_to_cpu((__force __be64)work.fdata->drinfo.ino), | |
11873 | + work.fdata->drinfo.oldnamelen, | |
11874 | + work.fdata->drinfo.oldname); | |
11875 | + | |
11876 | + err = au_drinfo_store_sio(&work, elm); | |
11877 | + AuTraceErr(err); | |
11878 | + if (unlikely(err)) | |
11879 | + break; | |
11880 | + } | |
11881 | + if (unlikely(err)) { | |
11882 | + /* revert all drinfo */ | |
11883 | + au_drinfo_store_rev(rev, &work); | |
11884 | + kfree(rev); | |
11885 | + *p = NULL; | |
11886 | + } | |
11887 | + au_hn_inode_unlock(hdir); | |
11888 | + | |
11889 | +out_args: | |
11890 | + au_drinfo_store_work_fin(&work); | |
11891 | +out: | |
11892 | + return err; | |
11893 | +} | |
11894 | + | |
11895 | +/* ---------------------------------------------------------------------- */ | |
11896 | + | |
11897 | +int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, | |
11898 | + struct qstr *dst_name, void *_rev) | |
11899 | +{ | |
11900 | + int err, already; | |
11901 | + ino_t ino; | |
11902 | + struct super_block *sb; | |
11903 | + struct au_branch *br; | |
11904 | + struct au_dr_br *dr; | |
11905 | + struct dentry *h_dentry; | |
11906 | + struct inode *h_inode; | |
11907 | + struct au_dr_hino *ent; | |
11908 | + struct au_drinfo_rev *rev, **p; | |
11909 | + | |
11910 | + AuDbg("bindex %d\n", bindex); | |
11911 | + | |
11912 | + err = -ENOMEM; | |
11913 | + ent = kmalloc(sizeof(*ent), GFP_NOFS); | |
11914 | + if (unlikely(!ent)) | |
11915 | + goto out; | |
11916 | + | |
11917 | + sb = src->d_sb; | |
11918 | + br = au_sbr(sb, bindex); | |
11919 | + dr = &br->br_dirren; | |
11920 | + h_dentry = au_h_dptr(src, bindex); | |
11921 | + h_inode = d_inode(h_dentry); | |
11922 | + ino = h_inode->i_ino; | |
11923 | + ent->dr_h_ino = ino; | |
11924 | + already = au_dr_hino_test_add(dr, ino, ent); | |
11925 | + AuDbg("b%d, hi%llu, already %d\n", | |
11926 | + bindex, (unsigned long long)ino, already); | |
11927 | + | |
11928 | + err = au_drinfo_store(src, bindex, dst_name, _rev); | |
11929 | + AuTraceErr(err); | |
11930 | + if (!err) { | |
11931 | + p = _rev; | |
11932 | + rev = *p; | |
11933 | + rev->already = already; | |
11934 | + goto out; /* success */ | |
11935 | + } | |
11936 | + | |
11937 | + /* revert */ | |
11938 | + if (!already) | |
11939 | + au_dr_hino_del(dr, ent); | |
11940 | + kfree(ent); | |
11941 | + | |
11942 | +out: | |
11943 | + AuTraceErr(err); | |
11944 | + return err; | |
11945 | +} | |
11946 | + | |
11947 | +void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *_rev) | |
11948 | +{ | |
11949 | + struct au_drinfo_rev *rev; | |
11950 | + struct au_drinfo_rev_elm *elm; | |
11951 | + int nelm; | |
11952 | + | |
11953 | + rev = _rev; | |
11954 | + elm = rev->elm; | |
11955 | + for (nelm = rev->nelm; nelm > 0; nelm--, elm++) { | |
11956 | + dput(elm->info_dentry); | |
11957 | + kfree(elm->info_last); | |
11958 | + } | |
11959 | + kfree(rev); | |
11960 | +} | |
11961 | + | |
11962 | +void au_dr_rename_rev(struct dentry *src, aufs_bindex_t btgt, void *_rev) | |
11963 | +{ | |
11964 | + int err; | |
11965 | + struct au_drinfo_store work; | |
11966 | + struct au_drinfo_rev *rev = _rev; | |
11967 | + struct super_block *sb; | |
11968 | + struct au_branch *br; | |
11969 | + struct inode *h_inode; | |
11970 | + struct au_dr_br *dr; | |
11971 | + struct au_dr_hino *ent; | |
11972 | + | |
11973 | + err = au_drinfo_store_work_init(&work, btgt); | |
11974 | + if (unlikely(err)) | |
11975 | + goto out; | |
11976 | + | |
11977 | + sb = src->d_sb; | |
11978 | + br = au_sbr(sb, btgt); | |
11979 | + work.h_ppath.dentry = au_h_dptr(src, btgt); | |
11980 | + work.h_ppath.mnt = au_br_mnt(br); | |
11981 | + au_drinfo_store_rev(rev, &work); | |
11982 | + au_drinfo_store_work_fin(&work); | |
11983 | + if (rev->already) | |
11984 | + goto out; | |
11985 | + | |
11986 | + dr = &br->br_dirren; | |
11987 | + h_inode = d_inode(work.h_ppath.dentry); | |
11988 | + ent = au_dr_hino_find(dr, h_inode->i_ino); | |
11989 | + BUG_ON(!ent); | |
11990 | + au_dr_hino_del(dr, ent); | |
11991 | + kfree(ent); | |
11992 | + | |
11993 | +out: | |
11994 | + kfree(rev); | |
11995 | + if (unlikely(err)) | |
11996 | + pr_err("failed to remove dirren info\n"); | |
11997 | +} | |
11998 | + | |
11999 | +/* ---------------------------------------------------------------------- */ | |
12000 | + | |
12001 | +static struct au_drinfo *au_drinfo_do_load(struct path *h_ppath, | |
12002 | + char *whname, int whnamelen, | |
12003 | + struct dentry **info_dentry) | |
12004 | +{ | |
12005 | + struct au_drinfo *drinfo; | |
12006 | + struct file *f; | |
12007 | + struct inode *h_dir; | |
12008 | + struct path infopath; | |
12009 | + int unlocked; | |
12010 | + | |
12011 | + AuDbg("%pd/%.*s\n", h_ppath->dentry, whnamelen, whname); | |
12012 | + | |
12013 | + *info_dentry = NULL; | |
12014 | + drinfo = NULL; | |
12015 | + unlocked = 0; | |
12016 | + h_dir = d_inode(h_ppath->dentry); | |
be118d29 | 12017 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
8b6a4947 AM |
12018 | + infopath.dentry = vfsub_lookup_one_len(whname, h_ppath->dentry, |
12019 | + whnamelen); | |
12020 | + if (IS_ERR(infopath.dentry)) { | |
12021 | + drinfo = (void *)infopath.dentry; | |
12022 | + goto out; | |
12023 | + } | |
12024 | + | |
12025 | + if (d_is_negative(infopath.dentry)) | |
12026 | + goto out_dput; /* success */ | |
12027 | + | |
12028 | + infopath.mnt = h_ppath->mnt; | |
12029 | + f = vfsub_dentry_open(&infopath, O_RDONLY); | |
12030 | + inode_unlock_shared(h_dir); | |
12031 | + unlocked = 1; | |
12032 | + if (IS_ERR(f)) { | |
12033 | + drinfo = (void *)f; | |
12034 | + goto out_dput; | |
12035 | + } | |
12036 | + | |
12037 | + drinfo = au_drinfo_read_k(f, /*h_ino*/0); | |
12038 | + if (IS_ERR_OR_NULL(drinfo)) | |
12039 | + goto out_fput; | |
12040 | + | |
12041 | + AuDbg("oldname %.*s\n", drinfo->oldnamelen, drinfo->oldname); | |
12042 | + *info_dentry = dget(infopath.dentry); /* keep it alive */ | |
12043 | + | |
12044 | +out_fput: | |
12045 | + fput(f); | |
12046 | +out_dput: | |
12047 | + dput(infopath.dentry); | |
12048 | +out: | |
12049 | + if (!unlocked) | |
12050 | + inode_unlock_shared(h_dir); | |
12051 | + AuTraceErrPtr(drinfo); | |
12052 | + return drinfo; | |
12053 | +} | |
12054 | + | |
12055 | +struct au_drinfo_do_load_args { | |
12056 | + struct au_drinfo **drinfop; | |
12057 | + struct path *h_ppath; | |
12058 | + char *whname; | |
12059 | + int whnamelen; | |
12060 | + struct dentry **info_dentry; | |
12061 | +}; | |
12062 | + | |
12063 | +static void au_call_drinfo_do_load(void *args) | |
12064 | +{ | |
12065 | + struct au_drinfo_do_load_args *a = args; | |
12066 | + | |
12067 | + *a->drinfop = au_drinfo_do_load(a->h_ppath, a->whname, a->whnamelen, | |
12068 | + a->info_dentry); | |
12069 | +} | |
12070 | + | |
12071 | +struct au_drinfo_load { | |
12072 | + struct path h_ppath; | |
12073 | + struct qstr *qname; | |
12074 | + unsigned char no_sio; | |
12075 | + | |
12076 | + aufs_bindex_t ninfo; | |
12077 | + struct au_drinfo **drinfo; | |
12078 | +}; | |
12079 | + | |
12080 | +static int au_drinfo_load(struct au_drinfo_load *w, aufs_bindex_t bindex, | |
12081 | + struct au_branch *br) | |
12082 | +{ | |
12083 | + int err, wkq_err, whnamelen, e; | |
12084 | + char whname[sizeof(AUFS_WH_DR_INFO_PFX) + AUFS_DIRREN_ENV_VAL_SZ] | |
12085 | + = AUFS_WH_DR_INFO_PFX; | |
12086 | + struct au_drinfo *drinfo; | |
12087 | + struct qstr oldname; | |
12088 | + struct inode *h_dir, *delegated; | |
12089 | + struct dentry *info_dentry; | |
12090 | + struct path infopath; | |
12091 | + | |
12092 | + whnamelen = sizeof(AUFS_WH_DR_INFO_PFX) - 1; | |
12093 | + whnamelen += au_drinfo_name(br, whname + whnamelen, | |
12094 | + sizeof(whname) - whnamelen); | |
12095 | + if (w->no_sio) | |
12096 | + drinfo = au_drinfo_do_load(&w->h_ppath, whname, whnamelen, | |
12097 | + &info_dentry); | |
12098 | + else { | |
12099 | + struct au_drinfo_do_load_args args = { | |
12100 | + .drinfop = &drinfo, | |
12101 | + .h_ppath = &w->h_ppath, | |
12102 | + .whname = whname, | |
12103 | + .whnamelen = whnamelen, | |
12104 | + .info_dentry = &info_dentry | |
12105 | + }; | |
12106 | + wkq_err = au_wkq_wait(au_call_drinfo_do_load, &args); | |
12107 | + if (unlikely(wkq_err)) | |
12108 | + drinfo = ERR_PTR(wkq_err); | |
12109 | + } | |
12110 | + err = PTR_ERR(drinfo); | |
12111 | + if (IS_ERR_OR_NULL(drinfo)) | |
12112 | + goto out; | |
12113 | + | |
12114 | + err = 0; | |
12115 | + oldname.len = drinfo->oldnamelen; | |
12116 | + oldname.name = drinfo->oldname; | |
12117 | + if (au_qstreq(w->qname, &oldname)) { | |
12118 | + /* the name is renamed back */ | |
12119 | + kfree(drinfo); | |
12120 | + drinfo = NULL; | |
12121 | + | |
12122 | + infopath.dentry = info_dentry; | |
12123 | + infopath.mnt = w->h_ppath.mnt; | |
12124 | + h_dir = d_inode(w->h_ppath.dentry); | |
12125 | + delegated = NULL; | |
12126 | + inode_lock_nested(h_dir, AuLsc_I_PARENT); | |
12127 | + e = vfsub_unlink(h_dir, &infopath, &delegated, !w->no_sio); | |
12128 | + inode_unlock(h_dir); | |
12129 | + if (unlikely(e)) | |
12130 | + AuIOErr("ignored %d, %pd2\n", e, &infopath.dentry); | |
12131 | + if (unlikely(e == -EWOULDBLOCK)) | |
12132 | + iput(delegated); | |
12133 | + } | |
12134 | + kfree(w->drinfo[bindex]); | |
12135 | + w->drinfo[bindex] = drinfo; | |
12136 | + dput(info_dentry); | |
12137 | + | |
12138 | +out: | |
12139 | + AuTraceErr(err); | |
12140 | + return err; | |
12141 | +} | |
12142 | + | |
12143 | +/* ---------------------------------------------------------------------- */ | |
12144 | + | |
12145 | +static void au_dr_lkup_free(struct au_drinfo **drinfo, int n) | |
12146 | +{ | |
12147 | + struct au_drinfo **p = drinfo; | |
12148 | + | |
12149 | + while (n-- > 0) | |
12150 | + kfree(*drinfo++); | |
12151 | + kfree(p); | |
12152 | +} | |
12153 | + | |
12154 | +int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12155 | + aufs_bindex_t btgt) | |
12156 | +{ | |
12157 | + int err, ninfo; | |
12158 | + struct au_drinfo_load w; | |
12159 | + aufs_bindex_t bindex, bbot; | |
12160 | + struct au_branch *br; | |
12161 | + struct inode *h_dir; | |
12162 | + struct au_dr_hino *ent; | |
12163 | + struct super_block *sb; | |
12164 | + | |
12165 | + AuDbg("%.*s, name %.*s, whname %.*s, b%d\n", | |
12166 | + AuLNPair(&dentry->d_name), AuLNPair(&lkup->dirren.dr_name), | |
12167 | + AuLNPair(&lkup->whname), btgt); | |
12168 | + | |
12169 | + sb = dentry->d_sb; | |
12170 | + bbot = au_sbbot(sb); | |
12171 | + w.ninfo = bbot + 1; | |
12172 | + if (!lkup->dirren.drinfo) { | |
12173 | + lkup->dirren.drinfo = kcalloc(w.ninfo, | |
12174 | + sizeof(*lkup->dirren.drinfo), | |
12175 | + GFP_NOFS); | |
12176 | + if (unlikely(!lkup->dirren.drinfo)) { | |
12177 | + err = -ENOMEM; | |
12178 | + goto out; | |
12179 | + } | |
12180 | + lkup->dirren.ninfo = w.ninfo; | |
12181 | + } | |
12182 | + w.drinfo = lkup->dirren.drinfo; | |
12183 | + w.no_sio = !!uid_eq(current_fsuid(), GLOBAL_ROOT_UID); | |
12184 | + w.h_ppath.dentry = au_h_dptr(dentry, btgt); | |
12185 | + AuDebugOn(!w.h_ppath.dentry); | |
12186 | + w.h_ppath.mnt = au_sbr_mnt(sb, btgt); | |
12187 | + w.qname = &dentry->d_name; | |
12188 | + | |
12189 | + ninfo = 0; | |
12190 | + for (bindex = btgt + 1; bindex <= bbot; bindex++) { | |
12191 | + br = au_sbr(sb, bindex); | |
12192 | + err = au_drinfo_load(&w, bindex, br); | |
12193 | + if (unlikely(err)) | |
12194 | + goto out_free; | |
12195 | + if (w.drinfo[bindex]) | |
12196 | + ninfo++; | |
12197 | + } | |
12198 | + if (!ninfo) { | |
12199 | + br = au_sbr(sb, btgt); | |
12200 | + h_dir = d_inode(w.h_ppath.dentry); | |
12201 | + ent = au_dr_hino_find(&br->br_dirren, h_dir->i_ino); | |
12202 | + AuDebugOn(!ent); | |
12203 | + au_dr_hino_del(&br->br_dirren, ent); | |
12204 | + kfree(ent); | |
12205 | + } | |
12206 | + goto out; /* success */ | |
12207 | + | |
12208 | +out_free: | |
12209 | + au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); | |
12210 | + lkup->dirren.ninfo = 0; | |
12211 | + lkup->dirren.drinfo = NULL; | |
12212 | +out: | |
12213 | + AuTraceErr(err); | |
12214 | + return err; | |
12215 | +} | |
12216 | + | |
12217 | +void au_dr_lkup_fin(struct au_do_lookup_args *lkup) | |
12218 | +{ | |
12219 | + au_dr_lkup_free(lkup->dirren.drinfo, lkup->dirren.ninfo); | |
12220 | +} | |
12221 | + | |
12222 | +int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt) | |
12223 | +{ | |
12224 | + int err; | |
12225 | + struct au_drinfo *drinfo; | |
12226 | + | |
12227 | + err = 0; | |
12228 | + if (!lkup->dirren.drinfo) | |
12229 | + goto out; | |
12230 | + AuDebugOn(lkup->dirren.ninfo < btgt + 1); | |
12231 | + drinfo = lkup->dirren.drinfo[btgt + 1]; | |
12232 | + if (!drinfo) | |
12233 | + goto out; | |
12234 | + | |
12235 | + kfree(lkup->whname.name); | |
12236 | + lkup->whname.name = NULL; | |
12237 | + lkup->dirren.dr_name.len = drinfo->oldnamelen; | |
12238 | + lkup->dirren.dr_name.name = drinfo->oldname; | |
12239 | + lkup->name = &lkup->dirren.dr_name; | |
12240 | + err = au_wh_name_alloc(&lkup->whname, lkup->name); | |
12241 | + if (!err) | |
12242 | + AuDbg("name %.*s, whname %.*s, b%d\n", | |
12243 | + AuLNPair(lkup->name), AuLNPair(&lkup->whname), | |
12244 | + btgt); | |
12245 | + | |
12246 | +out: | |
12247 | + AuTraceErr(err); | |
12248 | + return err; | |
12249 | +} | |
12250 | + | |
12251 | +int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, | |
12252 | + ino_t h_ino) | |
12253 | +{ | |
12254 | + int match; | |
12255 | + struct au_drinfo *drinfo; | |
12256 | + | |
12257 | + match = 1; | |
12258 | + if (!lkup->dirren.drinfo) | |
12259 | + goto out; | |
12260 | + AuDebugOn(lkup->dirren.ninfo < bindex + 1); | |
12261 | + drinfo = lkup->dirren.drinfo[bindex + 1]; | |
12262 | + if (!drinfo) | |
12263 | + goto out; | |
12264 | + | |
12265 | + match = (drinfo->ino == h_ino); | |
12266 | + AuDbg("match %d\n", match); | |
12267 | + | |
12268 | +out: | |
12269 | + return match; | |
12270 | +} | |
12271 | + | |
12272 | +/* ---------------------------------------------------------------------- */ | |
12273 | + | |
12274 | +int au_dr_opt_set(struct super_block *sb) | |
12275 | +{ | |
12276 | + int err; | |
12277 | + aufs_bindex_t bindex, bbot; | |
12278 | + struct au_branch *br; | |
12279 | + | |
12280 | + err = 0; | |
12281 | + bbot = au_sbbot(sb); | |
12282 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
12283 | + br = au_sbr(sb, bindex); | |
12284 | + err = au_dr_hino(sb, bindex, /*br*/NULL, &br->br_path); | |
12285 | + } | |
12286 | + | |
12287 | + return err; | |
12288 | +} | |
12289 | + | |
12290 | +int au_dr_opt_flush(struct super_block *sb) | |
12291 | +{ | |
12292 | + int err; | |
12293 | + aufs_bindex_t bindex, bbot; | |
12294 | + struct au_branch *br; | |
12295 | + | |
12296 | + err = 0; | |
12297 | + bbot = au_sbbot(sb); | |
12298 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
12299 | + br = au_sbr(sb, bindex); | |
12300 | + if (au_br_writable(br->br_perm)) | |
12301 | + err = au_dr_hino(sb, bindex, /*br*/NULL, /*path*/NULL); | |
12302 | + } | |
12303 | + | |
12304 | + return err; | |
12305 | +} | |
12306 | + | |
12307 | +int au_dr_opt_clr(struct super_block *sb, int no_flush) | |
12308 | +{ | |
12309 | + int err; | |
12310 | + aufs_bindex_t bindex, bbot; | |
12311 | + struct au_branch *br; | |
12312 | + | |
12313 | + err = 0; | |
12314 | + if (!no_flush) { | |
12315 | + err = au_dr_opt_flush(sb); | |
12316 | + if (unlikely(err)) | |
12317 | + goto out; | |
12318 | + } | |
12319 | + | |
12320 | + bbot = au_sbbot(sb); | |
12321 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
12322 | + br = au_sbr(sb, bindex); | |
12323 | + au_dr_hino_free(&br->br_dirren); | |
12324 | + } | |
12325 | + | |
12326 | +out: | |
12327 | + return err; | |
12328 | +} | |
12329 | diff -urN /usr/share/empty/fs/aufs/dirren.h linux/fs/aufs/dirren.h | |
12330 | --- /usr/share/empty/fs/aufs/dirren.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 12331 | +++ linux/fs/aufs/dirren.h 2018-08-12 23:43:05.453457863 +0200 |
062440b3 AM |
12332 | @@ -0,0 +1,140 @@ |
12333 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
8b6a4947 | 12334 | +/* |
b00004a5 | 12335 | + * Copyright (C) 2017-2018 Junjiro R. Okajima |
8b6a4947 AM |
12336 | + * |
12337 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12338 | + * it under the terms of the GNU General Public License as published by | |
12339 | + * the Free Software Foundation; either version 2 of the License, or | |
12340 | + * (at your option) any later version. | |
12341 | + * | |
12342 | + * This program is distributed in the hope that it will be useful, | |
12343 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12344 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12345 | + * GNU General Public License for more details. | |
12346 | + * | |
12347 | + * You should have received a copy of the GNU General Public License | |
12348 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
12349 | + */ | |
12350 | + | |
12351 | +/* | |
12352 | + * renamed dir info | |
12353 | + */ | |
12354 | + | |
12355 | +#ifndef __AUFS_DIRREN_H__ | |
12356 | +#define __AUFS_DIRREN_H__ | |
12357 | + | |
12358 | +#ifdef __KERNEL__ | |
12359 | + | |
12360 | +#include <linux/dcache.h> | |
12361 | +#include <linux/statfs.h> | |
12362 | +#include <linux/uuid.h> | |
12363 | +#include "hbl.h" | |
12364 | + | |
12365 | +#define AuDirren_NHASH 100 | |
12366 | + | |
12367 | +#ifdef CONFIG_AUFS_DIRREN | |
12368 | +enum au_brid_type { | |
12369 | + AuBrid_Unset, | |
12370 | + AuBrid_UUID, | |
12371 | + AuBrid_FSID, | |
12372 | + AuBrid_DEV | |
12373 | +}; | |
12374 | + | |
12375 | +struct au_dr_brid { | |
12376 | + enum au_brid_type type; | |
12377 | + union { | |
12378 | + uuid_t uuid; /* unimplemented yet */ | |
12379 | + fsid_t fsid; | |
12380 | + dev_t dev; | |
12381 | + }; | |
12382 | +}; | |
12383 | + | |
12384 | +/* 20 is the max digits length of ulong 64 */ | |
12385 | +/* brid-type "_" uuid "_" inum */ | |
12386 | +#define AUFS_DIRREN_FNAME_SZ (1 + 1 + UUID_STRING_LEN + 20) | |
12387 | +#define AUFS_DIRREN_ENV_VAL_SZ (AUFS_DIRREN_FNAME_SZ + 1 + 20) | |
12388 | + | |
12389 | +struct au_dr_hino { | |
12390 | + struct hlist_bl_node dr_hnode; | |
12391 | + ino_t dr_h_ino; | |
12392 | +}; | |
12393 | + | |
12394 | +struct au_dr_br { | |
12395 | + struct hlist_bl_head dr_h_ino[AuDirren_NHASH]; | |
12396 | + struct au_dr_brid dr_brid; | |
12397 | +}; | |
12398 | + | |
12399 | +struct au_dr_lookup { | |
12400 | + /* dr_name is pointed by struct au_do_lookup_args.name */ | |
12401 | + struct qstr dr_name; /* subset of dr_info */ | |
12402 | + aufs_bindex_t ninfo; | |
12403 | + struct au_drinfo **drinfo; | |
12404 | +}; | |
12405 | +#else | |
12406 | +struct au_dr_hino; | |
12407 | +/* empty */ | |
12408 | +struct au_dr_br { }; | |
12409 | +struct au_dr_lookup { }; | |
12410 | +#endif | |
12411 | + | |
12412 | +/* ---------------------------------------------------------------------- */ | |
12413 | + | |
12414 | +struct au_branch; | |
12415 | +struct au_do_lookup_args; | |
12416 | +struct au_hinode; | |
12417 | +#ifdef CONFIG_AUFS_DIRREN | |
12418 | +int au_dr_hino_test_add(struct au_dr_br *dr, ino_t h_ino, | |
12419 | + struct au_dr_hino *add_ent); | |
12420 | +void au_dr_hino_free(struct au_dr_br *dr); | |
12421 | +int au_dr_br_init(struct super_block *sb, struct au_branch *br, | |
12422 | + const struct path *path); | |
12423 | +int au_dr_br_fin(struct super_block *sb, struct au_branch *br); | |
12424 | +int au_dr_rename(struct dentry *src, aufs_bindex_t bindex, | |
12425 | + struct qstr *dst_name, void *_rev); | |
12426 | +void au_dr_rename_fin(struct dentry *src, aufs_bindex_t btgt, void *rev); | |
12427 | +void au_dr_rename_rev(struct dentry *src, aufs_bindex_t bindex, void *rev); | |
12428 | +int au_dr_lkup(struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12429 | + aufs_bindex_t bindex); | |
12430 | +int au_dr_lkup_name(struct au_do_lookup_args *lkup, aufs_bindex_t btgt); | |
12431 | +int au_dr_lkup_h_ino(struct au_do_lookup_args *lkup, aufs_bindex_t bindex, | |
12432 | + ino_t h_ino); | |
12433 | +void au_dr_lkup_fin(struct au_do_lookup_args *lkup); | |
12434 | +int au_dr_opt_set(struct super_block *sb); | |
12435 | +int au_dr_opt_flush(struct super_block *sb); | |
12436 | +int au_dr_opt_clr(struct super_block *sb, int no_flush); | |
12437 | +#else | |
12438 | +AuStubInt0(au_dr_hino_test_add, struct au_dr_br *dr, ino_t h_ino, | |
12439 | + struct au_dr_hino *add_ent); | |
12440 | +AuStubVoid(au_dr_hino_free, struct au_dr_br *dr); | |
12441 | +AuStubInt0(au_dr_br_init, struct super_block *sb, struct au_branch *br, | |
12442 | + const struct path *path); | |
12443 | +AuStubInt0(au_dr_br_fin, struct super_block *sb, struct au_branch *br); | |
12444 | +AuStubInt0(au_dr_rename, struct dentry *src, aufs_bindex_t bindex, | |
12445 | + struct qstr *dst_name, void *_rev); | |
12446 | +AuStubVoid(au_dr_rename_fin, struct dentry *src, aufs_bindex_t btgt, void *rev); | |
12447 | +AuStubVoid(au_dr_rename_rev, struct dentry *src, aufs_bindex_t bindex, | |
12448 | + void *rev); | |
12449 | +AuStubInt0(au_dr_lkup, struct au_do_lookup_args *lkup, struct dentry *dentry, | |
12450 | + aufs_bindex_t bindex); | |
12451 | +AuStubInt0(au_dr_lkup_name, struct au_do_lookup_args *lkup, aufs_bindex_t btgt); | |
12452 | +AuStubInt0(au_dr_lkup_h_ino, struct au_do_lookup_args *lkup, | |
12453 | + aufs_bindex_t bindex, ino_t h_ino); | |
12454 | +AuStubVoid(au_dr_lkup_fin, struct au_do_lookup_args *lkup); | |
12455 | +AuStubInt0(au_dr_opt_set, struct super_block *sb); | |
12456 | +AuStubInt0(au_dr_opt_flush, struct super_block *sb); | |
12457 | +AuStubInt0(au_dr_opt_clr, struct super_block *sb, int no_flush); | |
12458 | +#endif | |
12459 | + | |
12460 | +/* ---------------------------------------------------------------------- */ | |
12461 | + | |
12462 | +#ifdef CONFIG_AUFS_DIRREN | |
12463 | +static inline int au_dr_ihash(ino_t h_ino) | |
12464 | +{ | |
12465 | + return h_ino % AuDirren_NHASH; | |
12466 | +} | |
12467 | +#else | |
12468 | +AuStubInt0(au_dr_ihash, ino_t h_ino); | |
12469 | +#endif | |
12470 | + | |
12471 | +#endif /* __KERNEL__ */ | |
12472 | +#endif /* __AUFS_DIRREN_H__ */ | |
7f207e10 AM |
12473 | diff -urN /usr/share/empty/fs/aufs/dynop.c linux/fs/aufs/dynop.c |
12474 | --- /usr/share/empty/fs/aufs/dynop.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 12475 | +++ linux/fs/aufs/dynop.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 12476 | @@ -0,0 +1,370 @@ |
cd7a4cd9 | 12477 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 12478 | +/* |
b00004a5 | 12479 | + * Copyright (C) 2010-2018 Junjiro R. Okajima |
1facf9fc | 12480 | + * |
12481 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12482 | + * it under the terms of the GNU General Public License as published by | |
12483 | + * the Free Software Foundation; either version 2 of the License, or | |
12484 | + * (at your option) any later version. | |
dece6358 AM |
12485 | + * |
12486 | + * This program is distributed in the hope that it will be useful, | |
12487 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12488 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12489 | + * GNU General Public License for more details. | |
12490 | + * | |
12491 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12492 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 12493 | + */ |
12494 | + | |
12495 | +/* | |
4a4d8108 | 12496 | + * dynamically customizable operations for regular files |
1facf9fc | 12497 | + */ |
12498 | + | |
1facf9fc | 12499 | +#include "aufs.h" |
12500 | + | |
4a4d8108 | 12501 | +#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop) |
1facf9fc | 12502 | + |
4a4d8108 AM |
12503 | +/* |
12504 | + * How large will these lists be? | |
12505 | + * Usually just a few elements, 20-30 at most for each, I guess. | |
12506 | + */ | |
8b6a4947 | 12507 | +static struct hlist_bl_head dynop[AuDyLast]; |
4a4d8108 | 12508 | + |
8b6a4947 AM |
12509 | +static struct au_dykey *dy_gfind_get(struct hlist_bl_head *hbl, |
12510 | + const void *h_op) | |
1facf9fc | 12511 | +{ |
4a4d8108 | 12512 | + struct au_dykey *key, *tmp; |
8b6a4947 | 12513 | + struct hlist_bl_node *pos; |
1facf9fc | 12514 | + |
4a4d8108 | 12515 | + key = NULL; |
8b6a4947 AM |
12516 | + hlist_bl_lock(hbl); |
12517 | + hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) | |
4a4d8108 AM |
12518 | + if (tmp->dk_op.dy_hop == h_op) { |
12519 | + key = tmp; | |
12520 | + kref_get(&key->dk_kref); | |
12521 | + break; | |
12522 | + } | |
8b6a4947 | 12523 | + hlist_bl_unlock(hbl); |
4a4d8108 AM |
12524 | + |
12525 | + return key; | |
1facf9fc | 12526 | +} |
12527 | + | |
4a4d8108 | 12528 | +static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key) |
1facf9fc | 12529 | +{ |
4a4d8108 AM |
12530 | + struct au_dykey **k, *found; |
12531 | + const void *h_op = key->dk_op.dy_hop; | |
12532 | + int i; | |
1facf9fc | 12533 | + |
4a4d8108 AM |
12534 | + found = NULL; |
12535 | + k = br->br_dykey; | |
12536 | + for (i = 0; i < AuBrDynOp; i++) | |
12537 | + if (k[i]) { | |
12538 | + if (k[i]->dk_op.dy_hop == h_op) { | |
12539 | + found = k[i]; | |
12540 | + break; | |
12541 | + } | |
12542 | + } else | |
12543 | + break; | |
12544 | + if (!found) { | |
12545 | + spin_lock(&br->br_dykey_lock); | |
12546 | + for (; i < AuBrDynOp; i++) | |
12547 | + if (k[i]) { | |
12548 | + if (k[i]->dk_op.dy_hop == h_op) { | |
12549 | + found = k[i]; | |
12550 | + break; | |
12551 | + } | |
12552 | + } else { | |
12553 | + k[i] = key; | |
12554 | + break; | |
12555 | + } | |
12556 | + spin_unlock(&br->br_dykey_lock); | |
12557 | + BUG_ON(i == AuBrDynOp); /* expand the array */ | |
12558 | + } | |
12559 | + | |
12560 | + return found; | |
1facf9fc | 12561 | +} |
12562 | + | |
4a4d8108 | 12563 | +/* kref_get() if @key is already added */ |
8b6a4947 | 12564 | +static struct au_dykey *dy_gadd(struct hlist_bl_head *hbl, struct au_dykey *key) |
4a4d8108 AM |
12565 | +{ |
12566 | + struct au_dykey *tmp, *found; | |
8b6a4947 | 12567 | + struct hlist_bl_node *pos; |
4a4d8108 | 12568 | + const void *h_op = key->dk_op.dy_hop; |
1facf9fc | 12569 | + |
4a4d8108 | 12570 | + found = NULL; |
8b6a4947 AM |
12571 | + hlist_bl_lock(hbl); |
12572 | + hlist_bl_for_each_entry(tmp, pos, hbl, dk_hnode) | |
4a4d8108 AM |
12573 | + if (tmp->dk_op.dy_hop == h_op) { |
12574 | + kref_get(&tmp->dk_kref); | |
12575 | + found = tmp; | |
12576 | + break; | |
12577 | + } | |
12578 | + if (!found) | |
8b6a4947 AM |
12579 | + hlist_bl_add_head(&key->dk_hnode, hbl); |
12580 | + hlist_bl_unlock(hbl); | |
1facf9fc | 12581 | + |
4a4d8108 AM |
12582 | + if (!found) |
12583 | + DyPrSym(key); | |
12584 | + return found; | |
12585 | +} | |
12586 | + | |
12587 | +static void dy_free_rcu(struct rcu_head *rcu) | |
1facf9fc | 12588 | +{ |
4a4d8108 AM |
12589 | + struct au_dykey *key; |
12590 | + | |
12591 | + key = container_of(rcu, struct au_dykey, dk_rcu); | |
12592 | + DyPrSym(key); | |
1c60b727 | 12593 | + kfree(key); |
1facf9fc | 12594 | +} |
12595 | + | |
4a4d8108 AM |
12596 | +static void dy_free(struct kref *kref) |
12597 | +{ | |
12598 | + struct au_dykey *key; | |
8b6a4947 | 12599 | + struct hlist_bl_head *hbl; |
1facf9fc | 12600 | + |
4a4d8108 | 12601 | + key = container_of(kref, struct au_dykey, dk_kref); |
8b6a4947 AM |
12602 | + hbl = dynop + key->dk_op.dy_type; |
12603 | + au_hbl_del(&key->dk_hnode, hbl); | |
4a4d8108 AM |
12604 | + call_rcu(&key->dk_rcu, dy_free_rcu); |
12605 | +} | |
12606 | + | |
12607 | +void au_dy_put(struct au_dykey *key) | |
1facf9fc | 12608 | +{ |
4a4d8108 AM |
12609 | + kref_put(&key->dk_kref, dy_free); |
12610 | +} | |
1facf9fc | 12611 | + |
4a4d8108 AM |
12612 | +/* ---------------------------------------------------------------------- */ |
12613 | + | |
12614 | +#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *)) | |
12615 | + | |
12616 | +#ifdef CONFIG_AUFS_DEBUG | |
12617 | +#define DyDbgDeclare(cnt) unsigned int cnt = 0 | |
4f0767ce | 12618 | +#define DyDbgInc(cnt) do { cnt++; } while (0) |
4a4d8108 AM |
12619 | +#else |
12620 | +#define DyDbgDeclare(cnt) do {} while (0) | |
12621 | +#define DyDbgInc(cnt) do {} while (0) | |
12622 | +#endif | |
12623 | + | |
12624 | +#define DySet(func, dst, src, h_op, h_sb) do { \ | |
12625 | + DyDbgInc(cnt); \ | |
12626 | + if (h_op->func) { \ | |
12627 | + if (src.func) \ | |
12628 | + dst.func = src.func; \ | |
12629 | + else \ | |
12630 | + AuDbg("%s %s\n", au_sbtype(h_sb), #func); \ | |
12631 | + } \ | |
12632 | +} while (0) | |
12633 | + | |
12634 | +#define DySetForce(func, dst, src) do { \ | |
12635 | + AuDebugOn(!src.func); \ | |
12636 | + DyDbgInc(cnt); \ | |
12637 | + dst.func = src.func; \ | |
12638 | +} while (0) | |
12639 | + | |
12640 | +#define DySetAop(func) \ | |
12641 | + DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb) | |
12642 | +#define DySetAopForce(func) \ | |
12643 | + DySetForce(func, dyaop->da_op, aufs_aop) | |
12644 | + | |
12645 | +static void dy_aop(struct au_dykey *key, const void *h_op, | |
12646 | + struct super_block *h_sb __maybe_unused) | |
12647 | +{ | |
12648 | + struct au_dyaop *dyaop = (void *)key; | |
12649 | + const struct address_space_operations *h_aop = h_op; | |
12650 | + DyDbgDeclare(cnt); | |
12651 | + | |
12652 | + AuDbg("%s\n", au_sbtype(h_sb)); | |
12653 | + | |
12654 | + DySetAop(writepage); | |
12655 | + DySetAopForce(readpage); /* force */ | |
4a4d8108 AM |
12656 | + DySetAop(writepages); |
12657 | + DySetAop(set_page_dirty); | |
12658 | + DySetAop(readpages); | |
12659 | + DySetAop(write_begin); | |
12660 | + DySetAop(write_end); | |
12661 | + DySetAop(bmap); | |
12662 | + DySetAop(invalidatepage); | |
12663 | + DySetAop(releasepage); | |
027c5e7a | 12664 | + DySetAop(freepage); |
7e9cd9fe | 12665 | + /* this one will be changed according to an aufs mount option */ |
4a4d8108 | 12666 | + DySetAop(direct_IO); |
4a4d8108 | 12667 | + DySetAop(migratepage); |
e2f27e51 AM |
12668 | + DySetAop(isolate_page); |
12669 | + DySetAop(putback_page); | |
4a4d8108 AM |
12670 | + DySetAop(launder_page); |
12671 | + DySetAop(is_partially_uptodate); | |
392086de | 12672 | + DySetAop(is_dirty_writeback); |
4a4d8108 | 12673 | + DySetAop(error_remove_page); |
b4510431 AM |
12674 | + DySetAop(swap_activate); |
12675 | + DySetAop(swap_deactivate); | |
4a4d8108 AM |
12676 | + |
12677 | + DyDbgSize(cnt, *h_aop); | |
4a4d8108 AM |
12678 | +} |
12679 | + | |
4a4d8108 AM |
12680 | +/* ---------------------------------------------------------------------- */ |
12681 | + | |
12682 | +static void dy_bug(struct kref *kref) | |
12683 | +{ | |
12684 | + BUG(); | |
12685 | +} | |
12686 | + | |
12687 | +static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br) | |
12688 | +{ | |
12689 | + struct au_dykey *key, *old; | |
8b6a4947 | 12690 | + struct hlist_bl_head *hbl; |
b752ccd1 | 12691 | + struct op { |
4a4d8108 | 12692 | + unsigned int sz; |
b752ccd1 AM |
12693 | + void (*set)(struct au_dykey *key, const void *h_op, |
12694 | + struct super_block *h_sb __maybe_unused); | |
12695 | + }; | |
12696 | + static const struct op a[] = { | |
4a4d8108 AM |
12697 | + [AuDy_AOP] = { |
12698 | + .sz = sizeof(struct au_dyaop), | |
b752ccd1 | 12699 | + .set = dy_aop |
4a4d8108 | 12700 | + } |
b752ccd1 AM |
12701 | + }; |
12702 | + const struct op *p; | |
4a4d8108 | 12703 | + |
8b6a4947 AM |
12704 | + hbl = dynop + op->dy_type; |
12705 | + key = dy_gfind_get(hbl, op->dy_hop); | |
4a4d8108 AM |
12706 | + if (key) |
12707 | + goto out_add; /* success */ | |
12708 | + | |
12709 | + p = a + op->dy_type; | |
12710 | + key = kzalloc(p->sz, GFP_NOFS); | |
12711 | + if (unlikely(!key)) { | |
12712 | + key = ERR_PTR(-ENOMEM); | |
12713 | + goto out; | |
12714 | + } | |
12715 | + | |
12716 | + key->dk_op.dy_hop = op->dy_hop; | |
12717 | + kref_init(&key->dk_kref); | |
86dc4139 | 12718 | + p->set(key, op->dy_hop, au_br_sb(br)); |
8b6a4947 | 12719 | + old = dy_gadd(hbl, key); |
4a4d8108 | 12720 | + if (old) { |
1c60b727 | 12721 | + kfree(key); |
4a4d8108 AM |
12722 | + key = old; |
12723 | + } | |
12724 | + | |
12725 | +out_add: | |
12726 | + old = dy_bradd(br, key); | |
12727 | + if (old) | |
12728 | + /* its ref-count should never be zero here */ | |
12729 | + kref_put(&key->dk_kref, dy_bug); | |
12730 | +out: | |
12731 | + return key; | |
12732 | +} | |
12733 | + | |
12734 | +/* ---------------------------------------------------------------------- */ | |
12735 | +/* | |
12736 | + * Aufs prohibits O_DIRECT by defaut even if the branch supports it. | |
c1595e42 | 12737 | + * This behaviour is necessary to return an error from open(O_DIRECT) instead |
4a4d8108 AM |
12738 | + * of the succeeding I/O. The dio mount option enables O_DIRECT and makes |
12739 | + * open(O_DIRECT) always succeed, but the succeeding I/O may return an error. | |
12740 | + * See the aufs manual in detail. | |
4a4d8108 AM |
12741 | + */ |
12742 | +static void dy_adx(struct au_dyaop *dyaop, int do_dx) | |
12743 | +{ | |
7e9cd9fe | 12744 | + if (!do_dx) |
4a4d8108 | 12745 | + dyaop->da_op.direct_IO = NULL; |
7e9cd9fe | 12746 | + else |
4a4d8108 | 12747 | + dyaop->da_op.direct_IO = aufs_aop.direct_IO; |
4a4d8108 AM |
12748 | +} |
12749 | + | |
12750 | +static struct au_dyaop *dy_aget(struct au_branch *br, | |
12751 | + const struct address_space_operations *h_aop, | |
12752 | + int do_dx) | |
12753 | +{ | |
12754 | + struct au_dyaop *dyaop; | |
12755 | + struct au_dynop op; | |
12756 | + | |
12757 | + op.dy_type = AuDy_AOP; | |
12758 | + op.dy_haop = h_aop; | |
12759 | + dyaop = (void *)dy_get(&op, br); | |
12760 | + if (IS_ERR(dyaop)) | |
12761 | + goto out; | |
12762 | + dy_adx(dyaop, do_dx); | |
12763 | + | |
12764 | +out: | |
12765 | + return dyaop; | |
12766 | +} | |
12767 | + | |
12768 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
12769 | + struct inode *h_inode) | |
12770 | +{ | |
12771 | + int err, do_dx; | |
12772 | + struct super_block *sb; | |
12773 | + struct au_branch *br; | |
12774 | + struct au_dyaop *dyaop; | |
12775 | + | |
12776 | + AuDebugOn(!S_ISREG(h_inode->i_mode)); | |
12777 | + IiMustWriteLock(inode); | |
12778 | + | |
12779 | + sb = inode->i_sb; | |
12780 | + br = au_sbr(sb, bindex); | |
12781 | + do_dx = !!au_opt_test(au_mntflags(sb), DIO); | |
12782 | + dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx); | |
12783 | + err = PTR_ERR(dyaop); | |
12784 | + if (IS_ERR(dyaop)) | |
12785 | + /* unnecessary to call dy_fput() */ | |
12786 | + goto out; | |
12787 | + | |
12788 | + err = 0; | |
12789 | + inode->i_mapping->a_ops = &dyaop->da_op; | |
12790 | + | |
12791 | +out: | |
12792 | + return err; | |
12793 | +} | |
12794 | + | |
b752ccd1 AM |
12795 | +/* |
12796 | + * Is it safe to replace a_ops during the inode/file is in operation? | |
12797 | + * Yes, I hope so. | |
12798 | + */ | |
12799 | +int au_dy_irefresh(struct inode *inode) | |
12800 | +{ | |
12801 | + int err; | |
5afbbe0d | 12802 | + aufs_bindex_t btop; |
b752ccd1 AM |
12803 | + struct inode *h_inode; |
12804 | + | |
12805 | + err = 0; | |
12806 | + if (S_ISREG(inode->i_mode)) { | |
5afbbe0d AM |
12807 | + btop = au_ibtop(inode); |
12808 | + h_inode = au_h_iptr(inode, btop); | |
12809 | + err = au_dy_iaop(inode, btop, h_inode); | |
b752ccd1 AM |
12810 | + } |
12811 | + return err; | |
12812 | +} | |
12813 | + | |
4a4d8108 AM |
12814 | +void au_dy_arefresh(int do_dx) |
12815 | +{ | |
8b6a4947 AM |
12816 | + struct hlist_bl_head *hbl; |
12817 | + struct hlist_bl_node *pos; | |
4a4d8108 AM |
12818 | + struct au_dykey *key; |
12819 | + | |
8b6a4947 AM |
12820 | + hbl = dynop + AuDy_AOP; |
12821 | + hlist_bl_lock(hbl); | |
12822 | + hlist_bl_for_each_entry(key, pos, hbl, dk_hnode) | |
4a4d8108 | 12823 | + dy_adx((void *)key, do_dx); |
8b6a4947 | 12824 | + hlist_bl_unlock(hbl); |
4a4d8108 AM |
12825 | +} |
12826 | + | |
4a4d8108 AM |
12827 | +/* ---------------------------------------------------------------------- */ |
12828 | + | |
12829 | +void __init au_dy_init(void) | |
12830 | +{ | |
12831 | + int i; | |
12832 | + | |
12833 | + /* make sure that 'struct au_dykey *' can be any type */ | |
12834 | + BUILD_BUG_ON(offsetof(struct au_dyaop, da_key)); | |
4a4d8108 AM |
12835 | + |
12836 | + for (i = 0; i < AuDyLast; i++) | |
8b6a4947 | 12837 | + INIT_HLIST_BL_HEAD(dynop + i); |
4a4d8108 AM |
12838 | +} |
12839 | + | |
12840 | +void au_dy_fin(void) | |
12841 | +{ | |
12842 | + int i; | |
12843 | + | |
12844 | + for (i = 0; i < AuDyLast; i++) | |
8b6a4947 | 12845 | + WARN_ON(!hlist_bl_empty(dynop + i)); |
4a4d8108 | 12846 | +} |
7f207e10 AM |
12847 | diff -urN /usr/share/empty/fs/aufs/dynop.h linux/fs/aufs/dynop.h |
12848 | --- /usr/share/empty/fs/aufs/dynop.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 12849 | +++ linux/fs/aufs/dynop.h 2018-08-12 23:43:05.456791299 +0200 |
062440b3 AM |
12850 | @@ -0,0 +1,75 @@ |
12851 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
4a4d8108 | 12852 | +/* |
b00004a5 | 12853 | + * Copyright (C) 2010-2018 Junjiro R. Okajima |
4a4d8108 AM |
12854 | + * |
12855 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12856 | + * it under the terms of the GNU General Public License as published by | |
12857 | + * the Free Software Foundation; either version 2 of the License, or | |
12858 | + * (at your option) any later version. | |
12859 | + * | |
12860 | + * This program is distributed in the hope that it will be useful, | |
12861 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12862 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12863 | + * GNU General Public License for more details. | |
12864 | + * | |
12865 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12866 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
12867 | + */ |
12868 | + | |
12869 | +/* | |
12870 | + * dynamically customizable operations (for regular files only) | |
12871 | + */ | |
12872 | + | |
12873 | +#ifndef __AUFS_DYNOP_H__ | |
12874 | +#define __AUFS_DYNOP_H__ | |
12875 | + | |
12876 | +#ifdef __KERNEL__ | |
12877 | + | |
7e9cd9fe AM |
12878 | +#include <linux/fs.h> |
12879 | +#include <linux/kref.h> | |
4a4d8108 | 12880 | + |
2cbb1c4b | 12881 | +enum {AuDy_AOP, AuDyLast}; |
4a4d8108 AM |
12882 | + |
12883 | +struct au_dynop { | |
12884 | + int dy_type; | |
12885 | + union { | |
12886 | + const void *dy_hop; | |
12887 | + const struct address_space_operations *dy_haop; | |
4a4d8108 AM |
12888 | + }; |
12889 | +}; | |
12890 | + | |
12891 | +struct au_dykey { | |
12892 | + union { | |
8b6a4947 | 12893 | + struct hlist_bl_node dk_hnode; |
4a4d8108 AM |
12894 | + struct rcu_head dk_rcu; |
12895 | + }; | |
12896 | + struct au_dynop dk_op; | |
12897 | + | |
12898 | + /* | |
12899 | + * during I am in the branch local array, kref is gotten. when the | |
12900 | + * branch is removed, kref is put. | |
12901 | + */ | |
12902 | + struct kref dk_kref; | |
12903 | +}; | |
12904 | + | |
12905 | +/* stop unioning since their sizes are very different from each other */ | |
12906 | +struct au_dyaop { | |
12907 | + struct au_dykey da_key; | |
12908 | + struct address_space_operations da_op; /* not const */ | |
4a4d8108 AM |
12909 | +}; |
12910 | + | |
4a4d8108 AM |
12911 | +/* ---------------------------------------------------------------------- */ |
12912 | + | |
12913 | +/* dynop.c */ | |
12914 | +struct au_branch; | |
12915 | +void au_dy_put(struct au_dykey *key); | |
12916 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
12917 | + struct inode *h_inode); | |
b752ccd1 | 12918 | +int au_dy_irefresh(struct inode *inode); |
4a4d8108 | 12919 | +void au_dy_arefresh(int do_dio); |
4a4d8108 AM |
12920 | + |
12921 | +void __init au_dy_init(void); | |
12922 | +void au_dy_fin(void); | |
12923 | + | |
4a4d8108 AM |
12924 | +#endif /* __KERNEL__ */ |
12925 | +#endif /* __AUFS_DYNOP_H__ */ | |
7f207e10 AM |
12926 | diff -urN /usr/share/empty/fs/aufs/export.c linux/fs/aufs/export.c |
12927 | --- /usr/share/empty/fs/aufs/export.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 12928 | +++ linux/fs/aufs/export.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 12929 | @@ -0,0 +1,838 @@ |
cd7a4cd9 | 12930 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 12931 | +/* |
b00004a5 | 12932 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
12933 | + * |
12934 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12935 | + * it under the terms of the GNU General Public License as published by | |
12936 | + * the Free Software Foundation; either version 2 of the License, or | |
12937 | + * (at your option) any later version. | |
12938 | + * | |
12939 | + * This program is distributed in the hope that it will be useful, | |
12940 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12941 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12942 | + * GNU General Public License for more details. | |
12943 | + * | |
12944 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 12945 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
12946 | + */ |
12947 | + | |
12948 | +/* | |
12949 | + * export via nfs | |
12950 | + */ | |
12951 | + | |
12952 | +#include <linux/exportfs.h> | |
7eafdf33 | 12953 | +#include <linux/fs_struct.h> |
4a4d8108 AM |
12954 | +#include <linux/namei.h> |
12955 | +#include <linux/nsproxy.h> | |
12956 | +#include <linux/random.h> | |
12957 | +#include <linux/writeback.h> | |
12958 | +#include "aufs.h" | |
12959 | + | |
12960 | +union conv { | |
12961 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12962 | + __u32 a[2]; | |
12963 | +#else | |
12964 | + __u32 a[1]; | |
12965 | +#endif | |
12966 | + ino_t ino; | |
12967 | +}; | |
12968 | + | |
12969 | +static ino_t decode_ino(__u32 *a) | |
12970 | +{ | |
12971 | + union conv u; | |
12972 | + | |
12973 | + BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a)); | |
12974 | + u.a[0] = a[0]; | |
12975 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12976 | + u.a[1] = a[1]; | |
12977 | +#endif | |
12978 | + return u.ino; | |
12979 | +} | |
12980 | + | |
12981 | +static void encode_ino(__u32 *a, ino_t ino) | |
12982 | +{ | |
12983 | + union conv u; | |
12984 | + | |
12985 | + u.ino = ino; | |
12986 | + a[0] = u.a[0]; | |
12987 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12988 | + a[1] = u.a[1]; | |
12989 | +#endif | |
12990 | +} | |
12991 | + | |
12992 | +/* NFS file handle */ | |
12993 | +enum { | |
12994 | + Fh_br_id, | |
12995 | + Fh_sigen, | |
12996 | +#ifdef CONFIG_AUFS_INO_T_64 | |
12997 | + /* support 64bit inode number */ | |
12998 | + Fh_ino1, | |
12999 | + Fh_ino2, | |
13000 | + Fh_dir_ino1, | |
13001 | + Fh_dir_ino2, | |
13002 | +#else | |
13003 | + Fh_ino1, | |
13004 | + Fh_dir_ino1, | |
13005 | +#endif | |
13006 | + Fh_igen, | |
13007 | + Fh_h_type, | |
13008 | + Fh_tail, | |
13009 | + | |
13010 | + Fh_ino = Fh_ino1, | |
13011 | + Fh_dir_ino = Fh_dir_ino1 | |
13012 | +}; | |
13013 | + | |
13014 | +static int au_test_anon(struct dentry *dentry) | |
13015 | +{ | |
027c5e7a | 13016 | + /* note: read d_flags without d_lock */ |
4a4d8108 AM |
13017 | + return !!(dentry->d_flags & DCACHE_DISCONNECTED); |
13018 | +} | |
13019 | + | |
a2a7ad62 AM |
13020 | +int au_test_nfsd(void) |
13021 | +{ | |
13022 | + int ret; | |
13023 | + struct task_struct *tsk = current; | |
13024 | + char comm[sizeof(tsk->comm)]; | |
13025 | + | |
13026 | + ret = 0; | |
13027 | + if (tsk->flags & PF_KTHREAD) { | |
13028 | + get_task_comm(comm, tsk); | |
13029 | + ret = !strcmp(comm, "nfsd"); | |
13030 | + } | |
13031 | + | |
13032 | + return ret; | |
13033 | +} | |
13034 | + | |
4a4d8108 AM |
13035 | +/* ---------------------------------------------------------------------- */ |
13036 | +/* inode generation external table */ | |
13037 | + | |
b752ccd1 | 13038 | +void au_xigen_inc(struct inode *inode) |
4a4d8108 | 13039 | +{ |
4a4d8108 AM |
13040 | + loff_t pos; |
13041 | + ssize_t sz; | |
13042 | + __u32 igen; | |
13043 | + struct super_block *sb; | |
13044 | + struct au_sbinfo *sbinfo; | |
13045 | + | |
4a4d8108 | 13046 | + sb = inode->i_sb; |
b752ccd1 | 13047 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); |
1facf9fc | 13048 | + |
b752ccd1 | 13049 | + sbinfo = au_sbi(sb); |
1facf9fc | 13050 | + pos = inode->i_ino; |
13051 | + pos *= sizeof(igen); | |
13052 | + igen = inode->i_generation + 1; | |
1facf9fc | 13053 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen, |
13054 | + sizeof(igen), &pos); | |
13055 | + if (sz == sizeof(igen)) | |
b752ccd1 | 13056 | + return; /* success */ |
1facf9fc | 13057 | + |
b752ccd1 | 13058 | + if (unlikely(sz >= 0)) |
1facf9fc | 13059 | + AuIOErr("xigen error (%zd)\n", sz); |
1facf9fc | 13060 | +} |
13061 | + | |
13062 | +int au_xigen_new(struct inode *inode) | |
13063 | +{ | |
13064 | + int err; | |
13065 | + loff_t pos; | |
13066 | + ssize_t sz; | |
13067 | + struct super_block *sb; | |
13068 | + struct au_sbinfo *sbinfo; | |
13069 | + struct file *file; | |
13070 | + | |
13071 | + err = 0; | |
13072 | + /* todo: dirty, at mount time */ | |
13073 | + if (inode->i_ino == AUFS_ROOT_INO) | |
13074 | + goto out; | |
13075 | + sb = inode->i_sb; | |
dece6358 | 13076 | + SiMustAnyLock(sb); |
1facf9fc | 13077 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) |
13078 | + goto out; | |
13079 | + | |
13080 | + err = -EFBIG; | |
13081 | + pos = inode->i_ino; | |
13082 | + if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) { | |
13083 | + AuIOErr1("too large i%lld\n", pos); | |
13084 | + goto out; | |
13085 | + } | |
13086 | + pos *= sizeof(inode->i_generation); | |
13087 | + | |
13088 | + err = 0; | |
13089 | + sbinfo = au_sbi(sb); | |
13090 | + file = sbinfo->si_xigen; | |
13091 | + BUG_ON(!file); | |
13092 | + | |
c06a8ce3 | 13093 | + if (vfsub_f_size_read(file) |
1facf9fc | 13094 | + < pos + sizeof(inode->i_generation)) { |
13095 | + inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next); | |
13096 | + sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation, | |
13097 | + sizeof(inode->i_generation), &pos); | |
13098 | + } else | |
13099 | + sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation, | |
13100 | + sizeof(inode->i_generation), &pos); | |
13101 | + if (sz == sizeof(inode->i_generation)) | |
13102 | + goto out; /* success */ | |
13103 | + | |
13104 | + err = sz; | |
13105 | + if (unlikely(sz >= 0)) { | |
13106 | + err = -EIO; | |
13107 | + AuIOErr("xigen error (%zd)\n", sz); | |
13108 | + } | |
13109 | + | |
4f0767ce | 13110 | +out: |
1facf9fc | 13111 | + return err; |
13112 | +} | |
13113 | + | |
062440b3 | 13114 | +int au_xigen_set(struct super_block *sb, struct path *path) |
1facf9fc | 13115 | +{ |
13116 | + int err; | |
13117 | + struct au_sbinfo *sbinfo; | |
13118 | + struct file *file; | |
13119 | + | |
dece6358 AM |
13120 | + SiMustWriteLock(sb); |
13121 | + | |
1facf9fc | 13122 | + sbinfo = au_sbi(sb); |
062440b3 | 13123 | + file = au_xino_create2(sb, path, sbinfo->si_xigen); |
1facf9fc | 13124 | + err = PTR_ERR(file); |
13125 | + if (IS_ERR(file)) | |
13126 | + goto out; | |
13127 | + err = 0; | |
13128 | + if (sbinfo->si_xigen) | |
13129 | + fput(sbinfo->si_xigen); | |
13130 | + sbinfo->si_xigen = file; | |
13131 | + | |
4f0767ce | 13132 | +out: |
062440b3 | 13133 | + AuTraceErr(err); |
1facf9fc | 13134 | + return err; |
13135 | +} | |
13136 | + | |
13137 | +void au_xigen_clr(struct super_block *sb) | |
13138 | +{ | |
13139 | + struct au_sbinfo *sbinfo; | |
13140 | + | |
dece6358 AM |
13141 | + SiMustWriteLock(sb); |
13142 | + | |
1facf9fc | 13143 | + sbinfo = au_sbi(sb); |
13144 | + if (sbinfo->si_xigen) { | |
13145 | + fput(sbinfo->si_xigen); | |
13146 | + sbinfo->si_xigen = NULL; | |
13147 | + } | |
13148 | +} | |
13149 | + | |
13150 | +/* ---------------------------------------------------------------------- */ | |
13151 | + | |
13152 | +static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino, | |
13153 | + ino_t dir_ino) | |
13154 | +{ | |
13155 | + struct dentry *dentry, *d; | |
13156 | + struct inode *inode; | |
13157 | + unsigned int sigen; | |
13158 | + | |
13159 | + dentry = NULL; | |
13160 | + inode = ilookup(sb, ino); | |
13161 | + if (!inode) | |
13162 | + goto out; | |
13163 | + | |
13164 | + dentry = ERR_PTR(-ESTALE); | |
13165 | + sigen = au_sigen(sb); | |
5afbbe0d | 13166 | + if (unlikely(au_is_bad_inode(inode) |
1facf9fc | 13167 | + || IS_DEADDIR(inode) |
537831f9 | 13168 | + || sigen != au_iigen(inode, NULL))) |
1facf9fc | 13169 | + goto out_iput; |
13170 | + | |
13171 | + dentry = NULL; | |
13172 | + if (!dir_ino || S_ISDIR(inode->i_mode)) | |
13173 | + dentry = d_find_alias(inode); | |
13174 | + else { | |
027c5e7a | 13175 | + spin_lock(&inode->i_lock); |
c1595e42 | 13176 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { |
027c5e7a | 13177 | + spin_lock(&d->d_lock); |
1facf9fc | 13178 | + if (!au_test_anon(d) |
5527c038 | 13179 | + && d_inode(d->d_parent)->i_ino == dir_ino) { |
027c5e7a AM |
13180 | + dentry = dget_dlock(d); |
13181 | + spin_unlock(&d->d_lock); | |
1facf9fc | 13182 | + break; |
13183 | + } | |
027c5e7a AM |
13184 | + spin_unlock(&d->d_lock); |
13185 | + } | |
13186 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 13187 | + } |
027c5e7a | 13188 | + if (unlikely(dentry && au_digen_test(dentry, sigen))) { |
2cbb1c4b | 13189 | + /* need to refresh */ |
1facf9fc | 13190 | + dput(dentry); |
2cbb1c4b | 13191 | + dentry = NULL; |
1facf9fc | 13192 | + } |
13193 | + | |
4f0767ce | 13194 | +out_iput: |
1facf9fc | 13195 | + iput(inode); |
4f0767ce | 13196 | +out: |
2cbb1c4b | 13197 | + AuTraceErrPtr(dentry); |
1facf9fc | 13198 | + return dentry; |
13199 | +} | |
13200 | + | |
13201 | +/* ---------------------------------------------------------------------- */ | |
13202 | + | |
13203 | +/* todo: dirty? */ | |
13204 | +/* if exportfs_decode_fh() passed vfsmount*, we could be happy */ | |
4a4d8108 AM |
13205 | + |
13206 | +struct au_compare_mnt_args { | |
13207 | + /* input */ | |
13208 | + struct super_block *sb; | |
13209 | + | |
13210 | + /* output */ | |
13211 | + struct vfsmount *mnt; | |
13212 | +}; | |
13213 | + | |
13214 | +static int au_compare_mnt(struct vfsmount *mnt, void *arg) | |
13215 | +{ | |
13216 | + struct au_compare_mnt_args *a = arg; | |
13217 | + | |
13218 | + if (mnt->mnt_sb != a->sb) | |
13219 | + return 0; | |
13220 | + a->mnt = mntget(mnt); | |
13221 | + return 1; | |
13222 | +} | |
13223 | + | |
1facf9fc | 13224 | +static struct vfsmount *au_mnt_get(struct super_block *sb) |
13225 | +{ | |
4a4d8108 | 13226 | + int err; |
7eafdf33 | 13227 | + struct path root; |
4a4d8108 AM |
13228 | + struct au_compare_mnt_args args = { |
13229 | + .sb = sb | |
13230 | + }; | |
1facf9fc | 13231 | + |
7eafdf33 | 13232 | + get_fs_root(current->fs, &root); |
523b37e3 | 13233 | + rcu_read_lock(); |
7eafdf33 | 13234 | + err = iterate_mounts(au_compare_mnt, &args, root.mnt); |
523b37e3 | 13235 | + rcu_read_unlock(); |
7eafdf33 | 13236 | + path_put(&root); |
4a4d8108 AM |
13237 | + AuDebugOn(!err); |
13238 | + AuDebugOn(!args.mnt); | |
13239 | + return args.mnt; | |
1facf9fc | 13240 | +} |
13241 | + | |
13242 | +struct au_nfsd_si_lock { | |
4a4d8108 | 13243 | + unsigned int sigen; |
027c5e7a | 13244 | + aufs_bindex_t bindex, br_id; |
1facf9fc | 13245 | + unsigned char force_lock; |
13246 | +}; | |
13247 | + | |
027c5e7a AM |
13248 | +static int si_nfsd_read_lock(struct super_block *sb, |
13249 | + struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 13250 | +{ |
027c5e7a | 13251 | + int err; |
1facf9fc | 13252 | + aufs_bindex_t bindex; |
13253 | + | |
13254 | + si_read_lock(sb, AuLock_FLUSH); | |
13255 | + | |
13256 | + /* branch id may be wrapped around */ | |
027c5e7a | 13257 | + err = 0; |
1facf9fc | 13258 | + bindex = au_br_index(sb, nsi_lock->br_id); |
13259 | + if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb)) | |
13260 | + goto out; /* success */ | |
13261 | + | |
027c5e7a AM |
13262 | + err = -ESTALE; |
13263 | + bindex = -1; | |
1facf9fc | 13264 | + if (!nsi_lock->force_lock) |
13265 | + si_read_unlock(sb); | |
1facf9fc | 13266 | + |
4f0767ce | 13267 | +out: |
027c5e7a AM |
13268 | + nsi_lock->bindex = bindex; |
13269 | + return err; | |
1facf9fc | 13270 | +} |
13271 | + | |
13272 | +struct find_name_by_ino { | |
392086de | 13273 | + struct dir_context ctx; |
1facf9fc | 13274 | + int called, found; |
13275 | + ino_t ino; | |
13276 | + char *name; | |
13277 | + int namelen; | |
13278 | +}; | |
13279 | + | |
13280 | +static int | |
392086de AM |
13281 | +find_name_by_ino(struct dir_context *ctx, const char *name, int namelen, |
13282 | + loff_t offset, u64 ino, unsigned int d_type) | |
1facf9fc | 13283 | +{ |
392086de AM |
13284 | + struct find_name_by_ino *a = container_of(ctx, struct find_name_by_ino, |
13285 | + ctx); | |
1facf9fc | 13286 | + |
13287 | + a->called++; | |
13288 | + if (a->ino != ino) | |
13289 | + return 0; | |
13290 | + | |
13291 | + memcpy(a->name, name, namelen); | |
13292 | + a->namelen = namelen; | |
13293 | + a->found = 1; | |
13294 | + return 1; | |
13295 | +} | |
13296 | + | |
13297 | +static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino, | |
13298 | + struct au_nfsd_si_lock *nsi_lock) | |
13299 | +{ | |
13300 | + struct dentry *dentry, *parent; | |
13301 | + struct file *file; | |
13302 | + struct inode *dir; | |
392086de AM |
13303 | + struct find_name_by_ino arg = { |
13304 | + .ctx = { | |
2000de60 | 13305 | + .actor = find_name_by_ino |
392086de AM |
13306 | + } |
13307 | + }; | |
1facf9fc | 13308 | + int err; |
13309 | + | |
13310 | + parent = path->dentry; | |
13311 | + if (nsi_lock) | |
13312 | + si_read_unlock(parent->d_sb); | |
4a4d8108 | 13313 | + file = vfsub_dentry_open(path, au_dir_roflags); |
1facf9fc | 13314 | + dentry = (void *)file; |
13315 | + if (IS_ERR(file)) | |
13316 | + goto out; | |
13317 | + | |
13318 | + dentry = ERR_PTR(-ENOMEM); | |
537831f9 | 13319 | + arg.name = (void *)__get_free_page(GFP_NOFS); |
1facf9fc | 13320 | + if (unlikely(!arg.name)) |
13321 | + goto out_file; | |
13322 | + arg.ino = ino; | |
13323 | + arg.found = 0; | |
13324 | + do { | |
13325 | + arg.called = 0; | |
13326 | + /* smp_mb(); */ | |
392086de | 13327 | + err = vfsub_iterate_dir(file, &arg.ctx); |
1facf9fc | 13328 | + } while (!err && !arg.found && arg.called); |
13329 | + dentry = ERR_PTR(err); | |
13330 | + if (unlikely(err)) | |
13331 | + goto out_name; | |
1716fcea AM |
13332 | + /* instead of ENOENT */ |
13333 | + dentry = ERR_PTR(-ESTALE); | |
1facf9fc | 13334 | + if (!arg.found) |
13335 | + goto out_name; | |
13336 | + | |
b4510431 | 13337 | + /* do not call vfsub_lkup_one() */ |
5527c038 | 13338 | + dir = d_inode(parent); |
febd17d6 | 13339 | + dentry = vfsub_lookup_one_len_unlocked(arg.name, parent, arg.namelen); |
1facf9fc | 13340 | + AuTraceErrPtr(dentry); |
13341 | + if (IS_ERR(dentry)) | |
13342 | + goto out_name; | |
13343 | + AuDebugOn(au_test_anon(dentry)); | |
5527c038 | 13344 | + if (unlikely(d_really_is_negative(dentry))) { |
1facf9fc | 13345 | + dput(dentry); |
13346 | + dentry = ERR_PTR(-ENOENT); | |
13347 | + } | |
13348 | + | |
4f0767ce | 13349 | +out_name: |
1c60b727 | 13350 | + free_page((unsigned long)arg.name); |
4f0767ce | 13351 | +out_file: |
1facf9fc | 13352 | + fput(file); |
4f0767ce | 13353 | +out: |
1facf9fc | 13354 | + if (unlikely(nsi_lock |
13355 | + && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0)) | |
13356 | + if (!IS_ERR(dentry)) { | |
13357 | + dput(dentry); | |
13358 | + dentry = ERR_PTR(-ESTALE); | |
13359 | + } | |
13360 | + AuTraceErrPtr(dentry); | |
13361 | + return dentry; | |
13362 | +} | |
13363 | + | |
13364 | +static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino, | |
13365 | + ino_t dir_ino, | |
13366 | + struct au_nfsd_si_lock *nsi_lock) | |
13367 | +{ | |
13368 | + struct dentry *dentry; | |
13369 | + struct path path; | |
13370 | + | |
13371 | + if (dir_ino != AUFS_ROOT_INO) { | |
13372 | + path.dentry = decode_by_ino(sb, dir_ino, 0); | |
13373 | + dentry = path.dentry; | |
13374 | + if (!path.dentry || IS_ERR(path.dentry)) | |
13375 | + goto out; | |
13376 | + AuDebugOn(au_test_anon(path.dentry)); | |
13377 | + } else | |
13378 | + path.dentry = dget(sb->s_root); | |
13379 | + | |
13380 | + path.mnt = au_mnt_get(sb); | |
13381 | + dentry = au_lkup_by_ino(&path, ino, nsi_lock); | |
13382 | + path_put(&path); | |
13383 | + | |
4f0767ce | 13384 | +out: |
1facf9fc | 13385 | + AuTraceErrPtr(dentry); |
13386 | + return dentry; | |
13387 | +} | |
13388 | + | |
13389 | +/* ---------------------------------------------------------------------- */ | |
13390 | + | |
13391 | +static int h_acceptable(void *expv, struct dentry *dentry) | |
13392 | +{ | |
13393 | + return 1; | |
13394 | +} | |
13395 | + | |
13396 | +static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath, | |
13397 | + char *buf, int len, struct super_block *sb) | |
13398 | +{ | |
13399 | + char *p; | |
13400 | + int n; | |
13401 | + struct path path; | |
13402 | + | |
13403 | + p = d_path(h_rootpath, buf, len); | |
13404 | + if (IS_ERR(p)) | |
13405 | + goto out; | |
13406 | + n = strlen(p); | |
13407 | + | |
13408 | + path.mnt = h_rootpath->mnt; | |
13409 | + path.dentry = h_parent; | |
13410 | + p = d_path(&path, buf, len); | |
13411 | + if (IS_ERR(p)) | |
13412 | + goto out; | |
13413 | + if (n != 1) | |
13414 | + p += n; | |
13415 | + | |
13416 | + path.mnt = au_mnt_get(sb); | |
13417 | + path.dentry = sb->s_root; | |
13418 | + p = d_path(&path, buf, len - strlen(p)); | |
13419 | + mntput(path.mnt); | |
13420 | + if (IS_ERR(p)) | |
13421 | + goto out; | |
13422 | + if (n != 1) | |
13423 | + p[strlen(p)] = '/'; | |
13424 | + | |
4f0767ce | 13425 | +out: |
1facf9fc | 13426 | + AuTraceErrPtr(p); |
13427 | + return p; | |
13428 | +} | |
13429 | + | |
13430 | +static | |
027c5e7a AM |
13431 | +struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh, |
13432 | + int fh_len, struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 13433 | +{ |
13434 | + struct dentry *dentry, *h_parent, *root; | |
13435 | + struct super_block *h_sb; | |
13436 | + char *pathname, *p; | |
13437 | + struct vfsmount *h_mnt; | |
13438 | + struct au_branch *br; | |
13439 | + int err; | |
13440 | + struct path path; | |
13441 | + | |
027c5e7a | 13442 | + br = au_sbr(sb, nsi_lock->bindex); |
86dc4139 | 13443 | + h_mnt = au_br_mnt(br); |
1facf9fc | 13444 | + h_sb = h_mnt->mnt_sb; |
13445 | + /* todo: call lower fh_to_dentry()? fh_to_parent()? */ | |
5afbbe0d | 13446 | + lockdep_off(); |
1facf9fc | 13447 | + h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail), |
13448 | + fh_len - Fh_tail, fh[Fh_h_type], | |
13449 | + h_acceptable, /*context*/NULL); | |
5afbbe0d | 13450 | + lockdep_on(); |
1facf9fc | 13451 | + dentry = h_parent; |
13452 | + if (unlikely(!h_parent || IS_ERR(h_parent))) { | |
13453 | + AuWarn1("%s decode_fh failed, %ld\n", | |
13454 | + au_sbtype(h_sb), PTR_ERR(h_parent)); | |
13455 | + goto out; | |
13456 | + } | |
13457 | + dentry = NULL; | |
13458 | + if (unlikely(au_test_anon(h_parent))) { | |
13459 | + AuWarn1("%s decode_fh returned a disconnected dentry\n", | |
13460 | + au_sbtype(h_sb)); | |
13461 | + goto out_h_parent; | |
13462 | + } | |
13463 | + | |
13464 | + dentry = ERR_PTR(-ENOMEM); | |
13465 | + pathname = (void *)__get_free_page(GFP_NOFS); | |
13466 | + if (unlikely(!pathname)) | |
13467 | + goto out_h_parent; | |
13468 | + | |
13469 | + root = sb->s_root; | |
13470 | + path.mnt = h_mnt; | |
13471 | + di_read_lock_parent(root, !AuLock_IR); | |
027c5e7a | 13472 | + path.dentry = au_h_dptr(root, nsi_lock->bindex); |
1facf9fc | 13473 | + di_read_unlock(root, !AuLock_IR); |
13474 | + p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb); | |
13475 | + dentry = (void *)p; | |
13476 | + if (IS_ERR(p)) | |
13477 | + goto out_pathname; | |
13478 | + | |
13479 | + si_read_unlock(sb); | |
13480 | + err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); | |
13481 | + dentry = ERR_PTR(err); | |
13482 | + if (unlikely(err)) | |
13483 | + goto out_relock; | |
13484 | + | |
13485 | + dentry = ERR_PTR(-ENOENT); | |
13486 | + AuDebugOn(au_test_anon(path.dentry)); | |
5527c038 | 13487 | + if (unlikely(d_really_is_negative(path.dentry))) |
1facf9fc | 13488 | + goto out_path; |
13489 | + | |
5527c038 | 13490 | + if (ino != d_inode(path.dentry)->i_ino) |
1facf9fc | 13491 | + dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL); |
13492 | + else | |
13493 | + dentry = dget(path.dentry); | |
13494 | + | |
4f0767ce | 13495 | +out_path: |
1facf9fc | 13496 | + path_put(&path); |
4f0767ce | 13497 | +out_relock: |
1facf9fc | 13498 | + if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0)) |
13499 | + if (!IS_ERR(dentry)) { | |
13500 | + dput(dentry); | |
13501 | + dentry = ERR_PTR(-ESTALE); | |
13502 | + } | |
4f0767ce | 13503 | +out_pathname: |
1c60b727 | 13504 | + free_page((unsigned long)pathname); |
4f0767ce | 13505 | +out_h_parent: |
1facf9fc | 13506 | + dput(h_parent); |
4f0767ce | 13507 | +out: |
1facf9fc | 13508 | + AuTraceErrPtr(dentry); |
13509 | + return dentry; | |
13510 | +} | |
13511 | + | |
13512 | +/* ---------------------------------------------------------------------- */ | |
13513 | + | |
13514 | +static struct dentry * | |
13515 | +aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
13516 | + int fh_type) | |
13517 | +{ | |
13518 | + struct dentry *dentry; | |
13519 | + __u32 *fh = fid->raw; | |
027c5e7a | 13520 | + struct au_branch *br; |
1facf9fc | 13521 | + ino_t ino, dir_ino; |
1facf9fc | 13522 | + struct au_nfsd_si_lock nsi_lock = { |
1facf9fc | 13523 | + .force_lock = 0 |
13524 | + }; | |
13525 | + | |
1facf9fc | 13526 | + dentry = ERR_PTR(-ESTALE); |
4a4d8108 AM |
13527 | + /* it should never happen, but the file handle is unreliable */ |
13528 | + if (unlikely(fh_len < Fh_tail)) | |
13529 | + goto out; | |
13530 | + nsi_lock.sigen = fh[Fh_sigen]; | |
13531 | + nsi_lock.br_id = fh[Fh_br_id]; | |
13532 | + | |
1facf9fc | 13533 | + /* branch id may be wrapped around */ |
027c5e7a AM |
13534 | + br = NULL; |
13535 | + if (unlikely(si_nfsd_read_lock(sb, &nsi_lock))) | |
1facf9fc | 13536 | + goto out; |
13537 | + nsi_lock.force_lock = 1; | |
13538 | + | |
13539 | + /* is this inode still cached? */ | |
13540 | + ino = decode_ino(fh + Fh_ino); | |
4a4d8108 AM |
13541 | + /* it should never happen */ |
13542 | + if (unlikely(ino == AUFS_ROOT_INO)) | |
8cdd5066 | 13543 | + goto out_unlock; |
4a4d8108 | 13544 | + |
1facf9fc | 13545 | + dir_ino = decode_ino(fh + Fh_dir_ino); |
13546 | + dentry = decode_by_ino(sb, ino, dir_ino); | |
13547 | + if (IS_ERR(dentry)) | |
13548 | + goto out_unlock; | |
13549 | + if (dentry) | |
13550 | + goto accept; | |
13551 | + | |
13552 | + /* is the parent dir cached? */ | |
027c5e7a | 13553 | + br = au_sbr(sb, nsi_lock.bindex); |
5afbbe0d | 13554 | + au_br_get(br); |
1facf9fc | 13555 | + dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock); |
13556 | + if (IS_ERR(dentry)) | |
13557 | + goto out_unlock; | |
13558 | + if (dentry) | |
13559 | + goto accept; | |
13560 | + | |
13561 | + /* lookup path */ | |
027c5e7a | 13562 | + dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock); |
1facf9fc | 13563 | + if (IS_ERR(dentry)) |
13564 | + goto out_unlock; | |
13565 | + if (unlikely(!dentry)) | |
13566 | + /* todo?: make it ESTALE */ | |
13567 | + goto out_unlock; | |
13568 | + | |
4f0767ce | 13569 | +accept: |
027c5e7a | 13570 | + if (!au_digen_test(dentry, au_sigen(sb)) |
5527c038 | 13571 | + && d_inode(dentry)->i_generation == fh[Fh_igen]) |
1facf9fc | 13572 | + goto out_unlock; /* success */ |
13573 | + | |
13574 | + dput(dentry); | |
13575 | + dentry = ERR_PTR(-ESTALE); | |
4f0767ce | 13576 | +out_unlock: |
027c5e7a | 13577 | + if (br) |
5afbbe0d | 13578 | + au_br_put(br); |
1facf9fc | 13579 | + si_read_unlock(sb); |
4f0767ce | 13580 | +out: |
1facf9fc | 13581 | + AuTraceErrPtr(dentry); |
13582 | + return dentry; | |
13583 | +} | |
13584 | + | |
13585 | +#if 0 /* reserved for future use */ | |
13586 | +/* support subtreecheck option */ | |
13587 | +static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
13588 | + int fh_len, int fh_type) | |
13589 | +{ | |
13590 | + struct dentry *parent; | |
13591 | + __u32 *fh = fid->raw; | |
13592 | + ino_t dir_ino; | |
13593 | + | |
13594 | + dir_ino = decode_ino(fh + Fh_dir_ino); | |
13595 | + parent = decode_by_ino(sb, dir_ino, 0); | |
13596 | + if (IS_ERR(parent)) | |
13597 | + goto out; | |
13598 | + if (!parent) | |
13599 | + parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]), | |
13600 | + dir_ino, fh, fh_len); | |
13601 | + | |
4f0767ce | 13602 | +out: |
1facf9fc | 13603 | + AuTraceErrPtr(parent); |
13604 | + return parent; | |
13605 | +} | |
13606 | +#endif | |
13607 | + | |
13608 | +/* ---------------------------------------------------------------------- */ | |
13609 | + | |
0c3ec466 AM |
13610 | +static int aufs_encode_fh(struct inode *inode, __u32 *fh, int *max_len, |
13611 | + struct inode *dir) | |
1facf9fc | 13612 | +{ |
13613 | + int err; | |
0c3ec466 | 13614 | + aufs_bindex_t bindex; |
1facf9fc | 13615 | + struct super_block *sb, *h_sb; |
0c3ec466 AM |
13616 | + struct dentry *dentry, *parent, *h_parent; |
13617 | + struct inode *h_dir; | |
1facf9fc | 13618 | + struct au_branch *br; |
13619 | + | |
1facf9fc | 13620 | + err = -ENOSPC; |
13621 | + if (unlikely(*max_len <= Fh_tail)) { | |
13622 | + AuWarn1("NFSv2 client (max_len %d)?\n", *max_len); | |
13623 | + goto out; | |
13624 | + } | |
13625 | + | |
13626 | + err = FILEID_ROOT; | |
0c3ec466 AM |
13627 | + if (inode->i_ino == AUFS_ROOT_INO) { |
13628 | + AuDebugOn(inode->i_ino != AUFS_ROOT_INO); | |
1facf9fc | 13629 | + goto out; |
13630 | + } | |
13631 | + | |
1facf9fc | 13632 | + h_parent = NULL; |
0c3ec466 AM |
13633 | + sb = inode->i_sb; |
13634 | + err = si_read_lock(sb, AuLock_FLUSH); | |
027c5e7a AM |
13635 | + if (unlikely(err)) |
13636 | + goto out; | |
13637 | + | |
1facf9fc | 13638 | +#ifdef CONFIG_AUFS_DEBUG |
13639 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) | |
13640 | + AuWarn1("NFS-exporting requires xino\n"); | |
13641 | +#endif | |
027c5e7a | 13642 | + err = -EIO; |
0c3ec466 AM |
13643 | + parent = NULL; |
13644 | + ii_read_lock_child(inode); | |
5afbbe0d | 13645 | + bindex = au_ibtop(inode); |
0c3ec466 | 13646 | + if (!dir) { |
c1595e42 | 13647 | + dentry = d_find_any_alias(inode); |
0c3ec466 AM |
13648 | + if (unlikely(!dentry)) |
13649 | + goto out_unlock; | |
13650 | + AuDebugOn(au_test_anon(dentry)); | |
13651 | + parent = dget_parent(dentry); | |
13652 | + dput(dentry); | |
13653 | + if (unlikely(!parent)) | |
13654 | + goto out_unlock; | |
5527c038 JR |
13655 | + if (d_really_is_positive(parent)) |
13656 | + dir = d_inode(parent); | |
1facf9fc | 13657 | + } |
0c3ec466 AM |
13658 | + |
13659 | + ii_read_lock_parent(dir); | |
13660 | + h_dir = au_h_iptr(dir, bindex); | |
13661 | + ii_read_unlock(dir); | |
13662 | + if (unlikely(!h_dir)) | |
13663 | + goto out_parent; | |
c1595e42 | 13664 | + h_parent = d_find_any_alias(h_dir); |
1facf9fc | 13665 | + if (unlikely(!h_parent)) |
0c3ec466 | 13666 | + goto out_hparent; |
1facf9fc | 13667 | + |
13668 | + err = -EPERM; | |
13669 | + br = au_sbr(sb, bindex); | |
86dc4139 | 13670 | + h_sb = au_br_sb(br); |
1facf9fc | 13671 | + if (unlikely(!h_sb->s_export_op)) { |
13672 | + AuErr1("%s branch is not exportable\n", au_sbtype(h_sb)); | |
0c3ec466 | 13673 | + goto out_hparent; |
1facf9fc | 13674 | + } |
13675 | + | |
13676 | + fh[Fh_br_id] = br->br_id; | |
13677 | + fh[Fh_sigen] = au_sigen(sb); | |
13678 | + encode_ino(fh + Fh_ino, inode->i_ino); | |
0c3ec466 | 13679 | + encode_ino(fh + Fh_dir_ino, dir->i_ino); |
1facf9fc | 13680 | + fh[Fh_igen] = inode->i_generation; |
13681 | + | |
13682 | + *max_len -= Fh_tail; | |
13683 | + fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail), | |
13684 | + max_len, | |
13685 | + /*connectable or subtreecheck*/0); | |
13686 | + err = fh[Fh_h_type]; | |
13687 | + *max_len += Fh_tail; | |
13688 | + /* todo: macros? */ | |
1716fcea | 13689 | + if (err != FILEID_INVALID) |
1facf9fc | 13690 | + err = 99; |
13691 | + else | |
13692 | + AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb)); | |
13693 | + | |
0c3ec466 | 13694 | +out_hparent: |
1facf9fc | 13695 | + dput(h_parent); |
0c3ec466 | 13696 | +out_parent: |
1facf9fc | 13697 | + dput(parent); |
0c3ec466 AM |
13698 | +out_unlock: |
13699 | + ii_read_unlock(inode); | |
13700 | + si_read_unlock(sb); | |
4f0767ce | 13701 | +out: |
1facf9fc | 13702 | + if (unlikely(err < 0)) |
1716fcea | 13703 | + err = FILEID_INVALID; |
1facf9fc | 13704 | + return err; |
13705 | +} | |
13706 | + | |
13707 | +/* ---------------------------------------------------------------------- */ | |
13708 | + | |
4a4d8108 AM |
13709 | +static int aufs_commit_metadata(struct inode *inode) |
13710 | +{ | |
13711 | + int err; | |
13712 | + aufs_bindex_t bindex; | |
13713 | + struct super_block *sb; | |
13714 | + struct inode *h_inode; | |
13715 | + int (*f)(struct inode *inode); | |
13716 | + | |
13717 | + sb = inode->i_sb; | |
e49829fe | 13718 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 | 13719 | + ii_write_lock_child(inode); |
5afbbe0d | 13720 | + bindex = au_ibtop(inode); |
4a4d8108 AM |
13721 | + AuDebugOn(bindex < 0); |
13722 | + h_inode = au_h_iptr(inode, bindex); | |
13723 | + | |
13724 | + f = h_inode->i_sb->s_export_op->commit_metadata; | |
13725 | + if (f) | |
13726 | + err = f(h_inode); | |
13727 | + else { | |
13728 | + struct writeback_control wbc = { | |
13729 | + .sync_mode = WB_SYNC_ALL, | |
13730 | + .nr_to_write = 0 /* metadata only */ | |
13731 | + }; | |
13732 | + | |
13733 | + err = sync_inode(h_inode, &wbc); | |
13734 | + } | |
13735 | + | |
13736 | + au_cpup_attr_timesizes(inode); | |
13737 | + ii_write_unlock(inode); | |
13738 | + si_read_unlock(sb); | |
13739 | + return err; | |
13740 | +} | |
13741 | + | |
13742 | +/* ---------------------------------------------------------------------- */ | |
13743 | + | |
1facf9fc | 13744 | +static struct export_operations aufs_export_op = { |
4a4d8108 | 13745 | + .fh_to_dentry = aufs_fh_to_dentry, |
1facf9fc | 13746 | + /* .fh_to_parent = aufs_fh_to_parent, */ |
4a4d8108 AM |
13747 | + .encode_fh = aufs_encode_fh, |
13748 | + .commit_metadata = aufs_commit_metadata | |
1facf9fc | 13749 | +}; |
13750 | + | |
13751 | +void au_export_init(struct super_block *sb) | |
13752 | +{ | |
13753 | + struct au_sbinfo *sbinfo; | |
13754 | + __u32 u; | |
13755 | + | |
5afbbe0d AM |
13756 | + BUILD_BUG_ON_MSG(IS_BUILTIN(CONFIG_AUFS_FS) |
13757 | + && IS_MODULE(CONFIG_EXPORTFS), | |
13758 | + AUFS_NAME ": unsupported configuration " | |
13759 | + "CONFIG_EXPORTFS=m and CONFIG_AUFS_FS=y"); | |
13760 | + | |
1facf9fc | 13761 | + sb->s_export_op = &aufs_export_op; |
13762 | + sbinfo = au_sbi(sb); | |
13763 | + sbinfo->si_xigen = NULL; | |
13764 | + get_random_bytes(&u, sizeof(u)); | |
13765 | + BUILD_BUG_ON(sizeof(u) != sizeof(int)); | |
13766 | + atomic_set(&sbinfo->si_xigen_next, u); | |
13767 | +} | |
076b876e AM |
13768 | diff -urN /usr/share/empty/fs/aufs/fhsm.c linux/fs/aufs/fhsm.c |
13769 | --- /usr/share/empty/fs/aufs/fhsm.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 13770 | +++ linux/fs/aufs/fhsm.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 13771 | @@ -0,0 +1,427 @@ |
cd7a4cd9 | 13772 | +// SPDX-License-Identifier: GPL-2.0 |
076b876e | 13773 | +/* |
b00004a5 | 13774 | + * Copyright (C) 2011-2018 Junjiro R. Okajima |
076b876e AM |
13775 | + * |
13776 | + * This program, aufs is free software; you can redistribute it and/or modify | |
13777 | + * it under the terms of the GNU General Public License as published by | |
13778 | + * the Free Software Foundation; either version 2 of the License, or | |
13779 | + * (at your option) any later version. | |
13780 | + * | |
13781 | + * This program is distributed in the hope that it will be useful, | |
13782 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13783 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13784 | + * GNU General Public License for more details. | |
13785 | + * | |
13786 | + * You should have received a copy of the GNU General Public License | |
13787 | + * along with this program; if not, write to the Free Software | |
13788 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
13789 | + */ | |
13790 | + | |
13791 | +/* | |
13792 | + * File-based Hierarchy Storage Management | |
13793 | + */ | |
13794 | + | |
13795 | +#include <linux/anon_inodes.h> | |
13796 | +#include <linux/poll.h> | |
13797 | +#include <linux/seq_file.h> | |
13798 | +#include <linux/statfs.h> | |
13799 | +#include "aufs.h" | |
13800 | + | |
c1595e42 JR |
13801 | +static aufs_bindex_t au_fhsm_bottom(struct super_block *sb) |
13802 | +{ | |
13803 | + struct au_sbinfo *sbinfo; | |
13804 | + struct au_fhsm *fhsm; | |
13805 | + | |
13806 | + SiMustAnyLock(sb); | |
13807 | + | |
13808 | + sbinfo = au_sbi(sb); | |
13809 | + fhsm = &sbinfo->si_fhsm; | |
13810 | + AuDebugOn(!fhsm); | |
13811 | + return fhsm->fhsm_bottom; | |
13812 | +} | |
13813 | + | |
13814 | +void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex) | |
13815 | +{ | |
13816 | + struct au_sbinfo *sbinfo; | |
13817 | + struct au_fhsm *fhsm; | |
13818 | + | |
13819 | + SiMustWriteLock(sb); | |
13820 | + | |
13821 | + sbinfo = au_sbi(sb); | |
13822 | + fhsm = &sbinfo->si_fhsm; | |
13823 | + AuDebugOn(!fhsm); | |
13824 | + fhsm->fhsm_bottom = bindex; | |
13825 | +} | |
13826 | + | |
13827 | +/* ---------------------------------------------------------------------- */ | |
13828 | + | |
076b876e AM |
13829 | +static int au_fhsm_test_jiffy(struct au_sbinfo *sbinfo, struct au_branch *br) |
13830 | +{ | |
13831 | + struct au_br_fhsm *bf; | |
13832 | + | |
13833 | + bf = br->br_fhsm; | |
13834 | + MtxMustLock(&bf->bf_lock); | |
13835 | + | |
13836 | + return !bf->bf_readable | |
13837 | + || time_after(jiffies, | |
13838 | + bf->bf_jiffy + sbinfo->si_fhsm.fhsm_expire); | |
13839 | +} | |
13840 | + | |
13841 | +/* ---------------------------------------------------------------------- */ | |
13842 | + | |
13843 | +static void au_fhsm_notify(struct super_block *sb, int val) | |
13844 | +{ | |
13845 | + struct au_sbinfo *sbinfo; | |
13846 | + struct au_fhsm *fhsm; | |
13847 | + | |
13848 | + SiMustAnyLock(sb); | |
13849 | + | |
13850 | + sbinfo = au_sbi(sb); | |
13851 | + fhsm = &sbinfo->si_fhsm; | |
13852 | + if (au_fhsm_pid(fhsm) | |
13853 | + && atomic_read(&fhsm->fhsm_readable) != -1) { | |
13854 | + atomic_set(&fhsm->fhsm_readable, val); | |
13855 | + if (val) | |
13856 | + wake_up(&fhsm->fhsm_wqh); | |
13857 | + } | |
13858 | +} | |
13859 | + | |
13860 | +static int au_fhsm_stfs(struct super_block *sb, aufs_bindex_t bindex, | |
13861 | + struct aufs_stfs *rstfs, int do_lock, int do_notify) | |
13862 | +{ | |
13863 | + int err; | |
13864 | + struct au_branch *br; | |
13865 | + struct au_br_fhsm *bf; | |
13866 | + | |
13867 | + br = au_sbr(sb, bindex); | |
13868 | + AuDebugOn(au_br_rdonly(br)); | |
13869 | + bf = br->br_fhsm; | |
13870 | + AuDebugOn(!bf); | |
13871 | + | |
13872 | + if (do_lock) | |
13873 | + mutex_lock(&bf->bf_lock); | |
13874 | + else | |
13875 | + MtxMustLock(&bf->bf_lock); | |
13876 | + | |
13877 | + /* sb->s_root for NFS is unreliable */ | |
13878 | + err = au_br_stfs(br, &bf->bf_stfs); | |
13879 | + if (unlikely(err)) { | |
13880 | + AuErr1("FHSM failed (%d), b%d, ignored.\n", bindex, err); | |
13881 | + goto out; | |
13882 | + } | |
13883 | + | |
13884 | + bf->bf_jiffy = jiffies; | |
13885 | + bf->bf_readable = 1; | |
13886 | + if (do_notify) | |
13887 | + au_fhsm_notify(sb, /*val*/1); | |
13888 | + if (rstfs) | |
13889 | + *rstfs = bf->bf_stfs; | |
13890 | + | |
13891 | +out: | |
13892 | + if (do_lock) | |
13893 | + mutex_unlock(&bf->bf_lock); | |
13894 | + au_fhsm_notify(sb, /*val*/1); | |
13895 | + | |
13896 | + return err; | |
13897 | +} | |
13898 | + | |
13899 | +void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force) | |
13900 | +{ | |
13901 | + int err; | |
076b876e AM |
13902 | + struct au_sbinfo *sbinfo; |
13903 | + struct au_fhsm *fhsm; | |
13904 | + struct au_branch *br; | |
13905 | + struct au_br_fhsm *bf; | |
13906 | + | |
13907 | + AuDbg("b%d, force %d\n", bindex, force); | |
13908 | + SiMustAnyLock(sb); | |
13909 | + | |
13910 | + sbinfo = au_sbi(sb); | |
13911 | + fhsm = &sbinfo->si_fhsm; | |
c1595e42 JR |
13912 | + if (!au_ftest_si(sbinfo, FHSM) |
13913 | + || fhsm->fhsm_bottom == bindex) | |
076b876e AM |
13914 | + return; |
13915 | + | |
13916 | + br = au_sbr(sb, bindex); | |
13917 | + bf = br->br_fhsm; | |
13918 | + AuDebugOn(!bf); | |
13919 | + mutex_lock(&bf->bf_lock); | |
13920 | + if (force | |
13921 | + || au_fhsm_pid(fhsm) | |
13922 | + || au_fhsm_test_jiffy(sbinfo, br)) | |
13923 | + err = au_fhsm_stfs(sb, bindex, /*rstfs*/NULL, /*do_lock*/0, | |
13924 | + /*do_notify*/1); | |
13925 | + mutex_unlock(&bf->bf_lock); | |
13926 | +} | |
13927 | + | |
13928 | +void au_fhsm_wrote_all(struct super_block *sb, int force) | |
13929 | +{ | |
5afbbe0d | 13930 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
13931 | + struct au_branch *br; |
13932 | + | |
13933 | + /* exclude the bottom */ | |
5afbbe0d AM |
13934 | + bbot = au_fhsm_bottom(sb); |
13935 | + for (bindex = 0; bindex < bbot; bindex++) { | |
076b876e AM |
13936 | + br = au_sbr(sb, bindex); |
13937 | + if (au_br_fhsm(br->br_perm)) | |
13938 | + au_fhsm_wrote(sb, bindex, force); | |
13939 | + } | |
13940 | +} | |
13941 | + | |
13942 | +/* ---------------------------------------------------------------------- */ | |
13943 | + | |
be118d29 | 13944 | +static __poll_t au_fhsm_poll(struct file *file, struct poll_table_struct *wait) |
076b876e | 13945 | +{ |
be118d29 | 13946 | + __poll_t mask; |
076b876e AM |
13947 | + struct au_sbinfo *sbinfo; |
13948 | + struct au_fhsm *fhsm; | |
13949 | + | |
13950 | + mask = 0; | |
13951 | + sbinfo = file->private_data; | |
13952 | + fhsm = &sbinfo->si_fhsm; | |
13953 | + poll_wait(file, &fhsm->fhsm_wqh, wait); | |
13954 | + if (atomic_read(&fhsm->fhsm_readable)) | |
be118d29 | 13955 | + mask = EPOLLIN /* | EPOLLRDNORM */; |
076b876e | 13956 | + |
b00004a5 AM |
13957 | + if (!mask) |
13958 | + AuDbg("mask 0x%x\n", mask); | |
076b876e AM |
13959 | + return mask; |
13960 | +} | |
13961 | + | |
13962 | +static int au_fhsm_do_read_one(struct aufs_stbr __user *stbr, | |
13963 | + struct aufs_stfs *stfs, __s16 brid) | |
13964 | +{ | |
13965 | + int err; | |
13966 | + | |
13967 | + err = copy_to_user(&stbr->stfs, stfs, sizeof(*stfs)); | |
13968 | + if (!err) | |
13969 | + err = __put_user(brid, &stbr->brid); | |
13970 | + if (unlikely(err)) | |
13971 | + err = -EFAULT; | |
13972 | + | |
13973 | + return err; | |
13974 | +} | |
13975 | + | |
13976 | +static ssize_t au_fhsm_do_read(struct super_block *sb, | |
13977 | + struct aufs_stbr __user *stbr, size_t count) | |
13978 | +{ | |
13979 | + ssize_t err; | |
13980 | + int nstbr; | |
5afbbe0d | 13981 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
13982 | + struct au_branch *br; |
13983 | + struct au_br_fhsm *bf; | |
13984 | + | |
13985 | + /* except the bottom branch */ | |
13986 | + err = 0; | |
13987 | + nstbr = 0; | |
5afbbe0d AM |
13988 | + bbot = au_fhsm_bottom(sb); |
13989 | + for (bindex = 0; !err && bindex < bbot; bindex++) { | |
076b876e AM |
13990 | + br = au_sbr(sb, bindex); |
13991 | + if (!au_br_fhsm(br->br_perm)) | |
13992 | + continue; | |
13993 | + | |
13994 | + bf = br->br_fhsm; | |
13995 | + mutex_lock(&bf->bf_lock); | |
13996 | + if (bf->bf_readable) { | |
13997 | + err = -EFAULT; | |
13998 | + if (count >= sizeof(*stbr)) | |
13999 | + err = au_fhsm_do_read_one(stbr++, &bf->bf_stfs, | |
14000 | + br->br_id); | |
14001 | + if (!err) { | |
14002 | + bf->bf_readable = 0; | |
14003 | + count -= sizeof(*stbr); | |
14004 | + nstbr++; | |
14005 | + } | |
14006 | + } | |
14007 | + mutex_unlock(&bf->bf_lock); | |
14008 | + } | |
14009 | + if (!err) | |
14010 | + err = sizeof(*stbr) * nstbr; | |
14011 | + | |
14012 | + return err; | |
14013 | +} | |
14014 | + | |
14015 | +static ssize_t au_fhsm_read(struct file *file, char __user *buf, size_t count, | |
14016 | + loff_t *pos) | |
14017 | +{ | |
14018 | + ssize_t err; | |
14019 | + int readable; | |
5afbbe0d | 14020 | + aufs_bindex_t nfhsm, bindex, bbot; |
076b876e AM |
14021 | + struct au_sbinfo *sbinfo; |
14022 | + struct au_fhsm *fhsm; | |
14023 | + struct au_branch *br; | |
14024 | + struct super_block *sb; | |
14025 | + | |
14026 | + err = 0; | |
14027 | + sbinfo = file->private_data; | |
14028 | + fhsm = &sbinfo->si_fhsm; | |
14029 | +need_data: | |
14030 | + spin_lock_irq(&fhsm->fhsm_wqh.lock); | |
14031 | + if (!atomic_read(&fhsm->fhsm_readable)) { | |
14032 | + if (vfsub_file_flags(file) & O_NONBLOCK) | |
14033 | + err = -EAGAIN; | |
14034 | + else | |
14035 | + err = wait_event_interruptible_locked_irq | |
14036 | + (fhsm->fhsm_wqh, | |
14037 | + atomic_read(&fhsm->fhsm_readable)); | |
14038 | + } | |
14039 | + spin_unlock_irq(&fhsm->fhsm_wqh.lock); | |
14040 | + if (unlikely(err)) | |
14041 | + goto out; | |
14042 | + | |
14043 | + /* sb may already be dead */ | |
14044 | + au_rw_read_lock(&sbinfo->si_rwsem); | |
14045 | + readable = atomic_read(&fhsm->fhsm_readable); | |
14046 | + if (readable > 0) { | |
14047 | + sb = sbinfo->si_sb; | |
14048 | + AuDebugOn(!sb); | |
14049 | + /* exclude the bottom branch */ | |
14050 | + nfhsm = 0; | |
5afbbe0d AM |
14051 | + bbot = au_fhsm_bottom(sb); |
14052 | + for (bindex = 0; bindex < bbot; bindex++) { | |
076b876e AM |
14053 | + br = au_sbr(sb, bindex); |
14054 | + if (au_br_fhsm(br->br_perm)) | |
14055 | + nfhsm++; | |
14056 | + } | |
14057 | + err = -EMSGSIZE; | |
14058 | + if (nfhsm * sizeof(struct aufs_stbr) <= count) { | |
14059 | + atomic_set(&fhsm->fhsm_readable, 0); | |
14060 | + err = au_fhsm_do_read(sbinfo->si_sb, (void __user *)buf, | |
14061 | + count); | |
14062 | + } | |
14063 | + } | |
14064 | + au_rw_read_unlock(&sbinfo->si_rwsem); | |
14065 | + if (!readable) | |
14066 | + goto need_data; | |
14067 | + | |
14068 | +out: | |
14069 | + return err; | |
14070 | +} | |
14071 | + | |
14072 | +static int au_fhsm_release(struct inode *inode, struct file *file) | |
14073 | +{ | |
14074 | + struct au_sbinfo *sbinfo; | |
14075 | + struct au_fhsm *fhsm; | |
14076 | + | |
14077 | + /* sb may already be dead */ | |
14078 | + sbinfo = file->private_data; | |
14079 | + fhsm = &sbinfo->si_fhsm; | |
14080 | + spin_lock(&fhsm->fhsm_spin); | |
14081 | + fhsm->fhsm_pid = 0; | |
14082 | + spin_unlock(&fhsm->fhsm_spin); | |
14083 | + kobject_put(&sbinfo->si_kobj); | |
14084 | + | |
14085 | + return 0; | |
14086 | +} | |
14087 | + | |
14088 | +static const struct file_operations au_fhsm_fops = { | |
14089 | + .owner = THIS_MODULE, | |
14090 | + .llseek = noop_llseek, | |
14091 | + .read = au_fhsm_read, | |
14092 | + .poll = au_fhsm_poll, | |
14093 | + .release = au_fhsm_release | |
14094 | +}; | |
14095 | + | |
14096 | +int au_fhsm_fd(struct super_block *sb, int oflags) | |
14097 | +{ | |
14098 | + int err, fd; | |
14099 | + struct au_sbinfo *sbinfo; | |
14100 | + struct au_fhsm *fhsm; | |
14101 | + | |
14102 | + err = -EPERM; | |
14103 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
14104 | + goto out; | |
14105 | + | |
14106 | + err = -EINVAL; | |
14107 | + if (unlikely(oflags & ~(O_CLOEXEC | O_NONBLOCK))) | |
14108 | + goto out; | |
14109 | + | |
14110 | + err = 0; | |
14111 | + sbinfo = au_sbi(sb); | |
14112 | + fhsm = &sbinfo->si_fhsm; | |
14113 | + spin_lock(&fhsm->fhsm_spin); | |
14114 | + if (!fhsm->fhsm_pid) | |
14115 | + fhsm->fhsm_pid = current->pid; | |
14116 | + else | |
14117 | + err = -EBUSY; | |
14118 | + spin_unlock(&fhsm->fhsm_spin); | |
14119 | + if (unlikely(err)) | |
14120 | + goto out; | |
14121 | + | |
14122 | + oflags |= O_RDONLY; | |
14123 | + /* oflags |= FMODE_NONOTIFY; */ | |
14124 | + fd = anon_inode_getfd("[aufs_fhsm]", &au_fhsm_fops, sbinfo, oflags); | |
14125 | + err = fd; | |
14126 | + if (unlikely(fd < 0)) | |
14127 | + goto out_pid; | |
14128 | + | |
14129 | + /* succeed reglardless 'fhsm' status */ | |
14130 | + kobject_get(&sbinfo->si_kobj); | |
14131 | + si_noflush_read_lock(sb); | |
14132 | + if (au_ftest_si(sbinfo, FHSM)) | |
14133 | + au_fhsm_wrote_all(sb, /*force*/0); | |
14134 | + si_read_unlock(sb); | |
14135 | + goto out; /* success */ | |
14136 | + | |
14137 | +out_pid: | |
14138 | + spin_lock(&fhsm->fhsm_spin); | |
14139 | + fhsm->fhsm_pid = 0; | |
14140 | + spin_unlock(&fhsm->fhsm_spin); | |
14141 | +out: | |
14142 | + AuTraceErr(err); | |
14143 | + return err; | |
14144 | +} | |
14145 | + | |
14146 | +/* ---------------------------------------------------------------------- */ | |
14147 | + | |
14148 | +int au_fhsm_br_alloc(struct au_branch *br) | |
14149 | +{ | |
14150 | + int err; | |
14151 | + | |
14152 | + err = 0; | |
14153 | + br->br_fhsm = kmalloc(sizeof(*br->br_fhsm), GFP_NOFS); | |
14154 | + if (br->br_fhsm) | |
14155 | + au_br_fhsm_init(br->br_fhsm); | |
14156 | + else | |
14157 | + err = -ENOMEM; | |
14158 | + | |
14159 | + return err; | |
14160 | +} | |
14161 | + | |
14162 | +/* ---------------------------------------------------------------------- */ | |
14163 | + | |
14164 | +void au_fhsm_fin(struct super_block *sb) | |
14165 | +{ | |
14166 | + au_fhsm_notify(sb, /*val*/-1); | |
14167 | +} | |
14168 | + | |
14169 | +void au_fhsm_init(struct au_sbinfo *sbinfo) | |
14170 | +{ | |
14171 | + struct au_fhsm *fhsm; | |
14172 | + | |
14173 | + fhsm = &sbinfo->si_fhsm; | |
14174 | + spin_lock_init(&fhsm->fhsm_spin); | |
14175 | + init_waitqueue_head(&fhsm->fhsm_wqh); | |
14176 | + atomic_set(&fhsm->fhsm_readable, 0); | |
14177 | + fhsm->fhsm_expire | |
14178 | + = msecs_to_jiffies(AUFS_FHSM_CACHE_DEF_SEC * MSEC_PER_SEC); | |
c1595e42 | 14179 | + fhsm->fhsm_bottom = -1; |
076b876e AM |
14180 | +} |
14181 | + | |
14182 | +void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec) | |
14183 | +{ | |
14184 | + sbinfo->si_fhsm.fhsm_expire | |
14185 | + = msecs_to_jiffies(sec * MSEC_PER_SEC); | |
14186 | +} | |
14187 | + | |
14188 | +void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo) | |
14189 | +{ | |
14190 | + unsigned int u; | |
14191 | + | |
14192 | + if (!au_ftest_si(sbinfo, FHSM)) | |
14193 | + return; | |
14194 | + | |
14195 | + u = jiffies_to_msecs(sbinfo->si_fhsm.fhsm_expire) / MSEC_PER_SEC; | |
14196 | + if (u != AUFS_FHSM_CACHE_DEF_SEC) | |
14197 | + seq_printf(seq, ",fhsm_sec=%u", u); | |
14198 | +} | |
7f207e10 AM |
14199 | diff -urN /usr/share/empty/fs/aufs/file.c linux/fs/aufs/file.c |
14200 | --- /usr/share/empty/fs/aufs/file.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 14201 | +++ linux/fs/aufs/file.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 14202 | @@ -0,0 +1,857 @@ |
cd7a4cd9 | 14203 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 14204 | +/* |
b00004a5 | 14205 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 14206 | + * |
14207 | + * This program, aufs is free software; you can redistribute it and/or modify | |
14208 | + * it under the terms of the GNU General Public License as published by | |
14209 | + * the Free Software Foundation; either version 2 of the License, or | |
14210 | + * (at your option) any later version. | |
dece6358 AM |
14211 | + * |
14212 | + * This program is distributed in the hope that it will be useful, | |
14213 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14214 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14215 | + * GNU General Public License for more details. | |
14216 | + * | |
14217 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 14218 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 14219 | + */ |
14220 | + | |
14221 | +/* | |
4a4d8108 | 14222 | + * handling file/dir, and address_space operation |
1facf9fc | 14223 | + */ |
14224 | + | |
7eafdf33 AM |
14225 | +#ifdef CONFIG_AUFS_DEBUG |
14226 | +#include <linux/migrate.h> | |
14227 | +#endif | |
4a4d8108 | 14228 | +#include <linux/pagemap.h> |
1facf9fc | 14229 | +#include "aufs.h" |
14230 | + | |
4a4d8108 AM |
14231 | +/* drop flags for writing */ |
14232 | +unsigned int au_file_roflags(unsigned int flags) | |
14233 | +{ | |
14234 | + flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC); | |
14235 | + flags |= O_RDONLY | O_NOATIME; | |
14236 | + return flags; | |
14237 | +} | |
14238 | + | |
14239 | +/* common functions to regular file and dir */ | |
14240 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
392086de | 14241 | + struct file *file, int force_wr) |
1facf9fc | 14242 | +{ |
1308ab2a | 14243 | + struct file *h_file; |
4a4d8108 AM |
14244 | + struct dentry *h_dentry; |
14245 | + struct inode *h_inode; | |
14246 | + struct super_block *sb; | |
14247 | + struct au_branch *br; | |
14248 | + struct path h_path; | |
b912730e | 14249 | + int err; |
1facf9fc | 14250 | + |
4a4d8108 AM |
14251 | + /* a race condition can happen between open and unlink/rmdir */ |
14252 | + h_file = ERR_PTR(-ENOENT); | |
14253 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 14254 | + if (au_test_nfsd() && (!h_dentry || d_is_negative(h_dentry))) |
4a4d8108 | 14255 | + goto out; |
5527c038 | 14256 | + h_inode = d_inode(h_dentry); |
027c5e7a AM |
14257 | + spin_lock(&h_dentry->d_lock); |
14258 | + err = (!d_unhashed(dentry) && d_unlinked(h_dentry)) | |
5527c038 | 14259 | + /* || !d_inode(dentry)->i_nlink */ |
027c5e7a AM |
14260 | + ; |
14261 | + spin_unlock(&h_dentry->d_lock); | |
14262 | + if (unlikely(err)) | |
4a4d8108 | 14263 | + goto out; |
1facf9fc | 14264 | + |
4a4d8108 AM |
14265 | + sb = dentry->d_sb; |
14266 | + br = au_sbr(sb, bindex); | |
b912730e AM |
14267 | + err = au_br_test_oflag(flags, br); |
14268 | + h_file = ERR_PTR(err); | |
14269 | + if (unlikely(err)) | |
027c5e7a | 14270 | + goto out; |
1facf9fc | 14271 | + |
4a4d8108 | 14272 | + /* drop flags for writing */ |
5527c038 | 14273 | + if (au_test_ro(sb, bindex, d_inode(dentry))) { |
392086de AM |
14274 | + if (force_wr && !(flags & O_WRONLY)) |
14275 | + force_wr = 0; | |
4a4d8108 | 14276 | + flags = au_file_roflags(flags); |
392086de AM |
14277 | + if (force_wr) { |
14278 | + h_file = ERR_PTR(-EROFS); | |
14279 | + flags = au_file_roflags(flags); | |
14280 | + if (unlikely(vfsub_native_ro(h_inode) | |
14281 | + || IS_APPEND(h_inode))) | |
14282 | + goto out; | |
14283 | + flags &= ~O_ACCMODE; | |
14284 | + flags |= O_WRONLY; | |
14285 | + } | |
14286 | + } | |
4a4d8108 | 14287 | + flags &= ~O_CREAT; |
5afbbe0d | 14288 | + au_br_get(br); |
4a4d8108 | 14289 | + h_path.dentry = h_dentry; |
86dc4139 | 14290 | + h_path.mnt = au_br_mnt(br); |
38d290e6 | 14291 | + h_file = vfsub_dentry_open(&h_path, flags); |
4a4d8108 AM |
14292 | + if (IS_ERR(h_file)) |
14293 | + goto out_br; | |
dece6358 | 14294 | + |
b912730e | 14295 | + if (flags & __FMODE_EXEC) { |
4a4d8108 AM |
14296 | + err = deny_write_access(h_file); |
14297 | + if (unlikely(err)) { | |
14298 | + fput(h_file); | |
14299 | + h_file = ERR_PTR(err); | |
14300 | + goto out_br; | |
14301 | + } | |
14302 | + } | |
953406b4 | 14303 | + fsnotify_open(h_file); |
4a4d8108 | 14304 | + goto out; /* success */ |
1facf9fc | 14305 | + |
4f0767ce | 14306 | +out_br: |
5afbbe0d | 14307 | + au_br_put(br); |
4f0767ce | 14308 | +out: |
4a4d8108 AM |
14309 | + return h_file; |
14310 | +} | |
1308ab2a | 14311 | + |
076b876e AM |
14312 | +static int au_cmoo(struct dentry *dentry) |
14313 | +{ | |
8b6a4947 | 14314 | + int err, cmoo, matched; |
076b876e AM |
14315 | + unsigned int udba; |
14316 | + struct path h_path; | |
14317 | + struct au_pin pin; | |
14318 | + struct au_cp_generic cpg = { | |
14319 | + .dentry = dentry, | |
14320 | + .bdst = -1, | |
14321 | + .bsrc = -1, | |
14322 | + .len = -1, | |
14323 | + .pin = &pin, | |
14324 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
14325 | + }; | |
7e9cd9fe | 14326 | + struct inode *delegated; |
076b876e AM |
14327 | + struct super_block *sb; |
14328 | + struct au_sbinfo *sbinfo; | |
14329 | + struct au_fhsm *fhsm; | |
14330 | + pid_t pid; | |
14331 | + struct au_branch *br; | |
14332 | + struct dentry *parent; | |
14333 | + struct au_hinode *hdir; | |
14334 | + | |
14335 | + DiMustWriteLock(dentry); | |
5527c038 | 14336 | + IiMustWriteLock(d_inode(dentry)); |
076b876e AM |
14337 | + |
14338 | + err = 0; | |
14339 | + if (IS_ROOT(dentry)) | |
14340 | + goto out; | |
5afbbe0d | 14341 | + cpg.bsrc = au_dbtop(dentry); |
076b876e AM |
14342 | + if (!cpg.bsrc) |
14343 | + goto out; | |
14344 | + | |
14345 | + sb = dentry->d_sb; | |
14346 | + sbinfo = au_sbi(sb); | |
14347 | + fhsm = &sbinfo->si_fhsm; | |
14348 | + pid = au_fhsm_pid(fhsm); | |
8b6a4947 AM |
14349 | + rcu_read_lock(); |
14350 | + matched = (pid | |
14351 | + && (current->pid == pid | |
14352 | + || rcu_dereference(current->real_parent)->pid == pid)); | |
14353 | + rcu_read_unlock(); | |
14354 | + if (matched) | |
076b876e AM |
14355 | + goto out; |
14356 | + | |
14357 | + br = au_sbr(sb, cpg.bsrc); | |
14358 | + cmoo = au_br_cmoo(br->br_perm); | |
14359 | + if (!cmoo) | |
14360 | + goto out; | |
7e9cd9fe | 14361 | + if (!d_is_reg(dentry)) |
076b876e AM |
14362 | + cmoo &= AuBrAttr_COO_ALL; |
14363 | + if (!cmoo) | |
14364 | + goto out; | |
14365 | + | |
14366 | + parent = dget_parent(dentry); | |
14367 | + di_write_lock_parent(parent); | |
14368 | + err = au_wbr_do_copyup_bu(dentry, cpg.bsrc - 1); | |
14369 | + cpg.bdst = err; | |
14370 | + if (unlikely(err < 0)) { | |
14371 | + err = 0; /* there is no upper writable branch */ | |
14372 | + goto out_dgrade; | |
14373 | + } | |
14374 | + AuDbg("bsrc %d, bdst %d\n", cpg.bsrc, cpg.bdst); | |
14375 | + | |
14376 | + /* do not respect the coo attrib for the target branch */ | |
14377 | + err = au_cpup_dirs(dentry, cpg.bdst); | |
14378 | + if (unlikely(err)) | |
14379 | + goto out_dgrade; | |
14380 | + | |
14381 | + di_downgrade_lock(parent, AuLock_IR); | |
14382 | + udba = au_opt_udba(sb); | |
14383 | + err = au_pin(&pin, dentry, cpg.bdst, udba, | |
14384 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
14385 | + if (unlikely(err)) | |
14386 | + goto out_parent; | |
14387 | + | |
14388 | + err = au_sio_cpup_simple(&cpg); | |
14389 | + au_unpin(&pin); | |
14390 | + if (unlikely(err)) | |
14391 | + goto out_parent; | |
14392 | + if (!(cmoo & AuBrWAttr_MOO)) | |
14393 | + goto out_parent; /* success */ | |
14394 | + | |
14395 | + err = au_pin(&pin, dentry, cpg.bsrc, udba, | |
14396 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
14397 | + if (unlikely(err)) | |
14398 | + goto out_parent; | |
14399 | + | |
14400 | + h_path.mnt = au_br_mnt(br); | |
14401 | + h_path.dentry = au_h_dptr(dentry, cpg.bsrc); | |
5527c038 | 14402 | + hdir = au_hi(d_inode(parent), cpg.bsrc); |
076b876e AM |
14403 | + delegated = NULL; |
14404 | + err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, /*force*/1); | |
14405 | + au_unpin(&pin); | |
14406 | + /* todo: keep h_dentry or not? */ | |
14407 | + if (unlikely(err == -EWOULDBLOCK)) { | |
14408 | + pr_warn("cannot retry for NFSv4 delegation" | |
14409 | + " for an internal unlink\n"); | |
14410 | + iput(delegated); | |
14411 | + } | |
14412 | + if (unlikely(err)) { | |
14413 | + pr_err("unlink %pd after coo failed (%d), ignored\n", | |
14414 | + dentry, err); | |
14415 | + err = 0; | |
14416 | + } | |
14417 | + goto out_parent; /* success */ | |
14418 | + | |
14419 | +out_dgrade: | |
14420 | + di_downgrade_lock(parent, AuLock_IR); | |
14421 | +out_parent: | |
14422 | + di_read_unlock(parent, AuLock_IR); | |
14423 | + dput(parent); | |
14424 | +out: | |
14425 | + AuTraceErr(err); | |
14426 | + return err; | |
14427 | +} | |
14428 | + | |
b912730e | 14429 | +int au_do_open(struct file *file, struct au_do_open_args *args) |
1facf9fc | 14430 | +{ |
8b6a4947 | 14431 | + int err, aopen = args->aopen; |
1facf9fc | 14432 | + struct dentry *dentry; |
076b876e | 14433 | + struct au_finfo *finfo; |
1308ab2a | 14434 | + |
8b6a4947 | 14435 | + if (!aopen) |
b912730e AM |
14436 | + err = au_finfo_init(file, args->fidir); |
14437 | + else { | |
14438 | + lockdep_off(); | |
14439 | + err = au_finfo_init(file, args->fidir); | |
14440 | + lockdep_on(); | |
14441 | + } | |
4a4d8108 AM |
14442 | + if (unlikely(err)) |
14443 | + goto out; | |
1facf9fc | 14444 | + |
2000de60 | 14445 | + dentry = file->f_path.dentry; |
b912730e | 14446 | + AuDebugOn(IS_ERR_OR_NULL(dentry)); |
8b6a4947 AM |
14447 | + di_write_lock_child(dentry); |
14448 | + err = au_cmoo(dentry); | |
14449 | + di_downgrade_lock(dentry, AuLock_IR); | |
14450 | + if (!err) { | |
14451 | + if (!aopen) | |
b912730e | 14452 | + err = args->open(file, vfsub_file_flags(file), NULL); |
8b6a4947 AM |
14453 | + else { |
14454 | + lockdep_off(); | |
14455 | + err = args->open(file, vfsub_file_flags(file), NULL); | |
14456 | + lockdep_on(); | |
14457 | + } | |
b912730e | 14458 | + } |
8b6a4947 | 14459 | + di_read_unlock(dentry, AuLock_IR); |
1facf9fc | 14460 | + |
076b876e AM |
14461 | + finfo = au_fi(file); |
14462 | + if (!err) { | |
14463 | + finfo->fi_file = file; | |
8b6a4947 AM |
14464 | + au_hbl_add(&finfo->fi_hlist, |
14465 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
076b876e | 14466 | + } |
8b6a4947 | 14467 | + if (!aopen) |
b912730e AM |
14468 | + fi_write_unlock(file); |
14469 | + else { | |
14470 | + lockdep_off(); | |
14471 | + fi_write_unlock(file); | |
14472 | + lockdep_on(); | |
14473 | + } | |
4a4d8108 | 14474 | + if (unlikely(err)) { |
076b876e | 14475 | + finfo->fi_hdir = NULL; |
1c60b727 | 14476 | + au_finfo_fin(file); |
1308ab2a | 14477 | + } |
4a4d8108 | 14478 | + |
4f0767ce | 14479 | +out: |
8b6a4947 | 14480 | + AuTraceErr(err); |
1308ab2a | 14481 | + return err; |
14482 | +} | |
dece6358 | 14483 | + |
4a4d8108 | 14484 | +int au_reopen_nondir(struct file *file) |
1308ab2a | 14485 | +{ |
4a4d8108 | 14486 | + int err; |
5afbbe0d | 14487 | + aufs_bindex_t btop; |
4a4d8108 AM |
14488 | + struct dentry *dentry; |
14489 | + struct file *h_file, *h_file_tmp; | |
1308ab2a | 14490 | + |
2000de60 | 14491 | + dentry = file->f_path.dentry; |
5afbbe0d | 14492 | + btop = au_dbtop(dentry); |
4a4d8108 | 14493 | + h_file_tmp = NULL; |
5afbbe0d | 14494 | + if (au_fbtop(file) == btop) { |
4a4d8108 AM |
14495 | + h_file = au_hf_top(file); |
14496 | + if (file->f_mode == h_file->f_mode) | |
14497 | + return 0; /* success */ | |
14498 | + h_file_tmp = h_file; | |
14499 | + get_file(h_file_tmp); | |
5afbbe0d | 14500 | + au_set_h_fptr(file, btop, NULL); |
4a4d8108 AM |
14501 | + } |
14502 | + AuDebugOn(au_fi(file)->fi_hdir); | |
86dc4139 AM |
14503 | + /* |
14504 | + * it can happen | |
14505 | + * file exists on both of rw and ro | |
5afbbe0d | 14506 | + * open --> dbtop and fbtop are both 0 |
86dc4139 AM |
14507 | + * prepend a branch as rw, "rw" become ro |
14508 | + * remove rw/file | |
14509 | + * delete the top branch, "rw" becomes rw again | |
5afbbe0d AM |
14510 | + * --> dbtop is 1, fbtop is still 0 |
14511 | + * write --> fbtop is 0 but dbtop is 1 | |
86dc4139 | 14512 | + */ |
5afbbe0d | 14513 | + /* AuDebugOn(au_fbtop(file) < btop); */ |
1308ab2a | 14514 | + |
5afbbe0d | 14515 | + h_file = au_h_open(dentry, btop, vfsub_file_flags(file) & ~O_TRUNC, |
392086de | 14516 | + file, /*force_wr*/0); |
4a4d8108 | 14517 | + err = PTR_ERR(h_file); |
86dc4139 AM |
14518 | + if (IS_ERR(h_file)) { |
14519 | + if (h_file_tmp) { | |
5afbbe0d AM |
14520 | + au_sbr_get(dentry->d_sb, btop); |
14521 | + au_set_h_fptr(file, btop, h_file_tmp); | |
86dc4139 AM |
14522 | + h_file_tmp = NULL; |
14523 | + } | |
4a4d8108 | 14524 | + goto out; /* todo: close all? */ |
86dc4139 | 14525 | + } |
4a4d8108 AM |
14526 | + |
14527 | + err = 0; | |
5afbbe0d AM |
14528 | + au_set_fbtop(file, btop); |
14529 | + au_set_h_fptr(file, btop, h_file); | |
4a4d8108 AM |
14530 | + au_update_figen(file); |
14531 | + /* todo: necessary? */ | |
14532 | + /* file->f_ra = h_file->f_ra; */ | |
14533 | + | |
4f0767ce | 14534 | +out: |
4a4d8108 AM |
14535 | + if (h_file_tmp) |
14536 | + fput(h_file_tmp); | |
14537 | + return err; | |
1facf9fc | 14538 | +} |
14539 | + | |
1308ab2a | 14540 | +/* ---------------------------------------------------------------------- */ |
14541 | + | |
4a4d8108 AM |
14542 | +static int au_reopen_wh(struct file *file, aufs_bindex_t btgt, |
14543 | + struct dentry *hi_wh) | |
1facf9fc | 14544 | +{ |
4a4d8108 | 14545 | + int err; |
5afbbe0d | 14546 | + aufs_bindex_t btop; |
4a4d8108 AM |
14547 | + struct au_dinfo *dinfo; |
14548 | + struct dentry *h_dentry; | |
14549 | + struct au_hdentry *hdp; | |
1facf9fc | 14550 | + |
2000de60 | 14551 | + dinfo = au_di(file->f_path.dentry); |
4a4d8108 | 14552 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
dece6358 | 14553 | + |
5afbbe0d AM |
14554 | + btop = dinfo->di_btop; |
14555 | + dinfo->di_btop = btgt; | |
14556 | + hdp = au_hdentry(dinfo, btgt); | |
14557 | + h_dentry = hdp->hd_dentry; | |
14558 | + hdp->hd_dentry = hi_wh; | |
4a4d8108 | 14559 | + err = au_reopen_nondir(file); |
5afbbe0d AM |
14560 | + hdp->hd_dentry = h_dentry; |
14561 | + dinfo->di_btop = btop; | |
1facf9fc | 14562 | + |
1facf9fc | 14563 | + return err; |
14564 | +} | |
14565 | + | |
4a4d8108 | 14566 | +static int au_ready_to_write_wh(struct file *file, loff_t len, |
86dc4139 | 14567 | + aufs_bindex_t bcpup, struct au_pin *pin) |
1facf9fc | 14568 | +{ |
4a4d8108 | 14569 | + int err; |
027c5e7a | 14570 | + struct inode *inode, *h_inode; |
c2b27bf2 AM |
14571 | + struct dentry *h_dentry, *hi_wh; |
14572 | + struct au_cp_generic cpg = { | |
2000de60 | 14573 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14574 | + .bdst = bcpup, |
14575 | + .bsrc = -1, | |
14576 | + .len = len, | |
14577 | + .pin = pin | |
14578 | + }; | |
1facf9fc | 14579 | + |
5afbbe0d | 14580 | + au_update_dbtop(cpg.dentry); |
5527c038 | 14581 | + inode = d_inode(cpg.dentry); |
027c5e7a | 14582 | + h_inode = NULL; |
5afbbe0d AM |
14583 | + if (au_dbtop(cpg.dentry) <= bcpup |
14584 | + && au_dbbot(cpg.dentry) >= bcpup) { | |
c2b27bf2 | 14585 | + h_dentry = au_h_dptr(cpg.dentry, bcpup); |
5527c038 JR |
14586 | + if (h_dentry && d_is_positive(h_dentry)) |
14587 | + h_inode = d_inode(h_dentry); | |
027c5e7a | 14588 | + } |
4a4d8108 | 14589 | + hi_wh = au_hi_wh(inode, bcpup); |
027c5e7a | 14590 | + if (!hi_wh && !h_inode) |
c2b27bf2 | 14591 | + err = au_sio_cpup_wh(&cpg, file); |
4a4d8108 AM |
14592 | + else |
14593 | + /* already copied-up after unlink */ | |
14594 | + err = au_reopen_wh(file, bcpup, hi_wh); | |
1facf9fc | 14595 | + |
4a4d8108 | 14596 | + if (!err |
38d290e6 JR |
14597 | + && (inode->i_nlink > 1 |
14598 | + || (inode->i_state & I_LINKABLE)) | |
c2b27bf2 AM |
14599 | + && au_opt_test(au_mntflags(cpg.dentry->d_sb), PLINK)) |
14600 | + au_plink_append(inode, bcpup, au_h_dptr(cpg.dentry, bcpup)); | |
1308ab2a | 14601 | + |
dece6358 | 14602 | + return err; |
1facf9fc | 14603 | +} |
14604 | + | |
4a4d8108 AM |
14605 | +/* |
14606 | + * prepare the @file for writing. | |
14607 | + */ | |
14608 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin) | |
1facf9fc | 14609 | +{ |
4a4d8108 | 14610 | + int err; |
5afbbe0d | 14611 | + aufs_bindex_t dbtop; |
c1595e42 | 14612 | + struct dentry *parent; |
86dc4139 | 14613 | + struct inode *inode; |
1facf9fc | 14614 | + struct super_block *sb; |
4a4d8108 | 14615 | + struct file *h_file; |
c2b27bf2 | 14616 | + struct au_cp_generic cpg = { |
2000de60 | 14617 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14618 | + .bdst = -1, |
14619 | + .bsrc = -1, | |
14620 | + .len = len, | |
14621 | + .pin = pin, | |
14622 | + .flags = AuCpup_DTIME | |
14623 | + }; | |
1facf9fc | 14624 | + |
c2b27bf2 | 14625 | + sb = cpg.dentry->d_sb; |
5527c038 | 14626 | + inode = d_inode(cpg.dentry); |
5afbbe0d | 14627 | + cpg.bsrc = au_fbtop(file); |
c2b27bf2 | 14628 | + err = au_test_ro(sb, cpg.bsrc, inode); |
4a4d8108 | 14629 | + if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) { |
c2b27bf2 AM |
14630 | + err = au_pin(pin, cpg.dentry, cpg.bsrc, AuOpt_UDBA_NONE, |
14631 | + /*flags*/0); | |
1facf9fc | 14632 | + goto out; |
4a4d8108 | 14633 | + } |
1facf9fc | 14634 | + |
027c5e7a | 14635 | + /* need to cpup or reopen */ |
c2b27bf2 | 14636 | + parent = dget_parent(cpg.dentry); |
4a4d8108 | 14637 | + di_write_lock_parent(parent); |
c2b27bf2 AM |
14638 | + err = AuWbrCopyup(au_sbi(sb), cpg.dentry); |
14639 | + cpg.bdst = err; | |
4a4d8108 AM |
14640 | + if (unlikely(err < 0)) |
14641 | + goto out_dgrade; | |
14642 | + err = 0; | |
14643 | + | |
c2b27bf2 AM |
14644 | + if (!d_unhashed(cpg.dentry) && !au_h_dptr(parent, cpg.bdst)) { |
14645 | + err = au_cpup_dirs(cpg.dentry, cpg.bdst); | |
1facf9fc | 14646 | + if (unlikely(err)) |
4a4d8108 AM |
14647 | + goto out_dgrade; |
14648 | + } | |
14649 | + | |
c2b27bf2 | 14650 | + err = au_pin(pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, |
4a4d8108 AM |
14651 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); |
14652 | + if (unlikely(err)) | |
14653 | + goto out_dgrade; | |
14654 | + | |
5afbbe0d AM |
14655 | + dbtop = au_dbtop(cpg.dentry); |
14656 | + if (dbtop <= cpg.bdst) | |
c2b27bf2 | 14657 | + cpg.bsrc = cpg.bdst; |
027c5e7a | 14658 | + |
5afbbe0d | 14659 | + if (dbtop <= cpg.bdst /* just reopen */ |
c2b27bf2 | 14660 | + || !d_unhashed(cpg.dentry) /* copyup and reopen */ |
027c5e7a | 14661 | + ) { |
392086de | 14662 | + h_file = au_h_open_pre(cpg.dentry, cpg.bsrc, /*force_wr*/0); |
86dc4139 | 14663 | + if (IS_ERR(h_file)) |
027c5e7a | 14664 | + err = PTR_ERR(h_file); |
86dc4139 | 14665 | + else { |
027c5e7a | 14666 | + di_downgrade_lock(parent, AuLock_IR); |
5afbbe0d | 14667 | + if (dbtop > cpg.bdst) |
c2b27bf2 | 14668 | + err = au_sio_cpup_simple(&cpg); |
027c5e7a AM |
14669 | + if (!err) |
14670 | + err = au_reopen_nondir(file); | |
c2b27bf2 | 14671 | + au_h_open_post(cpg.dentry, cpg.bsrc, h_file); |
027c5e7a | 14672 | + } |
027c5e7a AM |
14673 | + } else { /* copyup as wh and reopen */ |
14674 | + /* | |
14675 | + * since writable hfsplus branch is not supported, | |
14676 | + * h_open_pre/post() are unnecessary. | |
14677 | + */ | |
c2b27bf2 | 14678 | + err = au_ready_to_write_wh(file, len, cpg.bdst, pin); |
4a4d8108 | 14679 | + di_downgrade_lock(parent, AuLock_IR); |
4a4d8108 | 14680 | + } |
4a4d8108 AM |
14681 | + |
14682 | + if (!err) { | |
14683 | + au_pin_set_parent_lflag(pin, /*lflag*/0); | |
14684 | + goto out_dput; /* success */ | |
14685 | + } | |
14686 | + au_unpin(pin); | |
14687 | + goto out_unlock; | |
1facf9fc | 14688 | + |
4f0767ce | 14689 | +out_dgrade: |
4a4d8108 | 14690 | + di_downgrade_lock(parent, AuLock_IR); |
4f0767ce | 14691 | +out_unlock: |
4a4d8108 | 14692 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 14693 | +out_dput: |
4a4d8108 | 14694 | + dput(parent); |
4f0767ce | 14695 | +out: |
1facf9fc | 14696 | + return err; |
14697 | +} | |
14698 | + | |
4a4d8108 AM |
14699 | +/* ---------------------------------------------------------------------- */ |
14700 | + | |
14701 | +int au_do_flush(struct file *file, fl_owner_t id, | |
14702 | + int (*flush)(struct file *file, fl_owner_t id)) | |
1facf9fc | 14703 | +{ |
4a4d8108 | 14704 | + int err; |
1facf9fc | 14705 | + struct super_block *sb; |
4a4d8108 | 14706 | + struct inode *inode; |
1facf9fc | 14707 | + |
c06a8ce3 AM |
14708 | + inode = file_inode(file); |
14709 | + sb = inode->i_sb; | |
4a4d8108 AM |
14710 | + si_noflush_read_lock(sb); |
14711 | + fi_read_lock(file); | |
b752ccd1 | 14712 | + ii_read_lock_child(inode); |
1facf9fc | 14713 | + |
4a4d8108 AM |
14714 | + err = flush(file, id); |
14715 | + au_cpup_attr_timesizes(inode); | |
1facf9fc | 14716 | + |
b752ccd1 | 14717 | + ii_read_unlock(inode); |
4a4d8108 | 14718 | + fi_read_unlock(file); |
1308ab2a | 14719 | + si_read_unlock(sb); |
dece6358 | 14720 | + return err; |
1facf9fc | 14721 | +} |
14722 | + | |
4a4d8108 AM |
14723 | +/* ---------------------------------------------------------------------- */ |
14724 | + | |
14725 | +static int au_file_refresh_by_inode(struct file *file, int *need_reopen) | |
1facf9fc | 14726 | +{ |
4a4d8108 | 14727 | + int err; |
4a4d8108 AM |
14728 | + struct au_pin pin; |
14729 | + struct au_finfo *finfo; | |
c2b27bf2 | 14730 | + struct dentry *parent, *hi_wh; |
4a4d8108 | 14731 | + struct inode *inode; |
1facf9fc | 14732 | + struct super_block *sb; |
c2b27bf2 | 14733 | + struct au_cp_generic cpg = { |
2000de60 | 14734 | + .dentry = file->f_path.dentry, |
c2b27bf2 AM |
14735 | + .bdst = -1, |
14736 | + .bsrc = -1, | |
14737 | + .len = -1, | |
14738 | + .pin = &pin, | |
14739 | + .flags = AuCpup_DTIME | |
14740 | + }; | |
1facf9fc | 14741 | + |
4a4d8108 AM |
14742 | + FiMustWriteLock(file); |
14743 | + | |
14744 | + err = 0; | |
14745 | + finfo = au_fi(file); | |
c2b27bf2 | 14746 | + sb = cpg.dentry->d_sb; |
5527c038 | 14747 | + inode = d_inode(cpg.dentry); |
5afbbe0d | 14748 | + cpg.bdst = au_ibtop(inode); |
c2b27bf2 | 14749 | + if (cpg.bdst == finfo->fi_btop || IS_ROOT(cpg.dentry)) |
1308ab2a | 14750 | + goto out; |
dece6358 | 14751 | + |
c2b27bf2 AM |
14752 | + parent = dget_parent(cpg.dentry); |
14753 | + if (au_test_ro(sb, cpg.bdst, inode)) { | |
4a4d8108 | 14754 | + di_read_lock_parent(parent, !AuLock_IR); |
c2b27bf2 AM |
14755 | + err = AuWbrCopyup(au_sbi(sb), cpg.dentry); |
14756 | + cpg.bdst = err; | |
4a4d8108 AM |
14757 | + di_read_unlock(parent, !AuLock_IR); |
14758 | + if (unlikely(err < 0)) | |
14759 | + goto out_parent; | |
14760 | + err = 0; | |
1facf9fc | 14761 | + } |
1facf9fc | 14762 | + |
4a4d8108 | 14763 | + di_read_lock_parent(parent, AuLock_IR); |
c2b27bf2 | 14764 | + hi_wh = au_hi_wh(inode, cpg.bdst); |
7f207e10 AM |
14765 | + if (!S_ISDIR(inode->i_mode) |
14766 | + && au_opt_test(au_mntflags(sb), PLINK) | |
4a4d8108 | 14767 | + && au_plink_test(inode) |
c2b27bf2 | 14768 | + && !d_unhashed(cpg.dentry) |
5afbbe0d | 14769 | + && cpg.bdst < au_dbtop(cpg.dentry)) { |
c2b27bf2 | 14770 | + err = au_test_and_cpup_dirs(cpg.dentry, cpg.bdst); |
4a4d8108 AM |
14771 | + if (unlikely(err)) |
14772 | + goto out_unlock; | |
14773 | + | |
14774 | + /* always superio. */ | |
c2b27bf2 | 14775 | + err = au_pin(&pin, cpg.dentry, cpg.bdst, AuOpt_UDBA_NONE, |
4a4d8108 | 14776 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); |
367653fa | 14777 | + if (!err) { |
c2b27bf2 | 14778 | + err = au_sio_cpup_simple(&cpg); |
367653fa AM |
14779 | + au_unpin(&pin); |
14780 | + } | |
4a4d8108 AM |
14781 | + } else if (hi_wh) { |
14782 | + /* already copied-up after unlink */ | |
c2b27bf2 | 14783 | + err = au_reopen_wh(file, cpg.bdst, hi_wh); |
4a4d8108 AM |
14784 | + *need_reopen = 0; |
14785 | + } | |
1facf9fc | 14786 | + |
4f0767ce | 14787 | +out_unlock: |
4a4d8108 | 14788 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 14789 | +out_parent: |
4a4d8108 | 14790 | + dput(parent); |
4f0767ce | 14791 | +out: |
1308ab2a | 14792 | + return err; |
dece6358 | 14793 | +} |
1facf9fc | 14794 | + |
4a4d8108 | 14795 | +static void au_do_refresh_dir(struct file *file) |
dece6358 | 14796 | +{ |
5afbbe0d | 14797 | + aufs_bindex_t bindex, bbot, new_bindex, brid; |
4a4d8108 AM |
14798 | + struct au_hfile *p, tmp, *q; |
14799 | + struct au_finfo *finfo; | |
1308ab2a | 14800 | + struct super_block *sb; |
4a4d8108 | 14801 | + struct au_fidir *fidir; |
1facf9fc | 14802 | + |
4a4d8108 | 14803 | + FiMustWriteLock(file); |
1facf9fc | 14804 | + |
2000de60 | 14805 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 AM |
14806 | + finfo = au_fi(file); |
14807 | + fidir = finfo->fi_hdir; | |
14808 | + AuDebugOn(!fidir); | |
14809 | + p = fidir->fd_hfile + finfo->fi_btop; | |
14810 | + brid = p->hf_br->br_id; | |
5afbbe0d AM |
14811 | + bbot = fidir->fd_bbot; |
14812 | + for (bindex = finfo->fi_btop; bindex <= bbot; bindex++, p++) { | |
4a4d8108 AM |
14813 | + if (!p->hf_file) |
14814 | + continue; | |
1308ab2a | 14815 | + |
4a4d8108 AM |
14816 | + new_bindex = au_br_index(sb, p->hf_br->br_id); |
14817 | + if (new_bindex == bindex) | |
14818 | + continue; | |
14819 | + if (new_bindex < 0) { | |
14820 | + au_set_h_fptr(file, bindex, NULL); | |
14821 | + continue; | |
14822 | + } | |
1308ab2a | 14823 | + |
4a4d8108 AM |
14824 | + /* swap two lower inode, and loop again */ |
14825 | + q = fidir->fd_hfile + new_bindex; | |
14826 | + tmp = *q; | |
14827 | + *q = *p; | |
14828 | + *p = tmp; | |
14829 | + if (tmp.hf_file) { | |
14830 | + bindex--; | |
14831 | + p--; | |
14832 | + } | |
14833 | + } | |
1308ab2a | 14834 | + |
4a4d8108 | 14835 | + p = fidir->fd_hfile; |
2000de60 | 14836 | + if (!au_test_mmapped(file) && !d_unlinked(file->f_path.dentry)) { |
5afbbe0d AM |
14837 | + bbot = au_sbbot(sb); |
14838 | + for (finfo->fi_btop = 0; finfo->fi_btop <= bbot; | |
4a4d8108 AM |
14839 | + finfo->fi_btop++, p++) |
14840 | + if (p->hf_file) { | |
c06a8ce3 | 14841 | + if (file_inode(p->hf_file)) |
4a4d8108 | 14842 | + break; |
1c60b727 | 14843 | + au_hfput(p, /*execed*/0); |
4a4d8108 AM |
14844 | + } |
14845 | + } else { | |
5afbbe0d AM |
14846 | + bbot = au_br_index(sb, brid); |
14847 | + for (finfo->fi_btop = 0; finfo->fi_btop < bbot; | |
4a4d8108 AM |
14848 | + finfo->fi_btop++, p++) |
14849 | + if (p->hf_file) | |
1c60b727 | 14850 | + au_hfput(p, /*execed*/0); |
5afbbe0d | 14851 | + bbot = au_sbbot(sb); |
4a4d8108 | 14852 | + } |
1308ab2a | 14853 | + |
5afbbe0d AM |
14854 | + p = fidir->fd_hfile + bbot; |
14855 | + for (fidir->fd_bbot = bbot; fidir->fd_bbot >= finfo->fi_btop; | |
4a4d8108 AM |
14856 | + fidir->fd_bbot--, p--) |
14857 | + if (p->hf_file) { | |
c06a8ce3 | 14858 | + if (file_inode(p->hf_file)) |
4a4d8108 | 14859 | + break; |
1c60b727 | 14860 | + au_hfput(p, /*execed*/0); |
4a4d8108 AM |
14861 | + } |
14862 | + AuDebugOn(fidir->fd_bbot < finfo->fi_btop); | |
1308ab2a | 14863 | +} |
14864 | + | |
4a4d8108 AM |
14865 | +/* |
14866 | + * after branch manipulating, refresh the file. | |
14867 | + */ | |
14868 | +static int refresh_file(struct file *file, int (*reopen)(struct file *file)) | |
1facf9fc | 14869 | +{ |
e2f27e51 | 14870 | + int err, need_reopen, nbr; |
5afbbe0d | 14871 | + aufs_bindex_t bbot, bindex; |
4a4d8108 | 14872 | + struct dentry *dentry; |
e2f27e51 | 14873 | + struct super_block *sb; |
1308ab2a | 14874 | + struct au_finfo *finfo; |
4a4d8108 | 14875 | + struct au_hfile *hfile; |
1facf9fc | 14876 | + |
2000de60 | 14877 | + dentry = file->f_path.dentry; |
e2f27e51 AM |
14878 | + sb = dentry->d_sb; |
14879 | + nbr = au_sbbot(sb) + 1; | |
1308ab2a | 14880 | + finfo = au_fi(file); |
4a4d8108 AM |
14881 | + if (!finfo->fi_hdir) { |
14882 | + hfile = &finfo->fi_htop; | |
14883 | + AuDebugOn(!hfile->hf_file); | |
e2f27e51 | 14884 | + bindex = au_br_index(sb, hfile->hf_br->br_id); |
4a4d8108 AM |
14885 | + AuDebugOn(bindex < 0); |
14886 | + if (bindex != finfo->fi_btop) | |
5afbbe0d | 14887 | + au_set_fbtop(file, bindex); |
4a4d8108 | 14888 | + } else { |
e2f27e51 | 14889 | + err = au_fidir_realloc(finfo, nbr, /*may_shrink*/0); |
4a4d8108 AM |
14890 | + if (unlikely(err)) |
14891 | + goto out; | |
14892 | + au_do_refresh_dir(file); | |
14893 | + } | |
1facf9fc | 14894 | + |
4a4d8108 AM |
14895 | + err = 0; |
14896 | + need_reopen = 1; | |
14897 | + if (!au_test_mmapped(file)) | |
14898 | + err = au_file_refresh_by_inode(file, &need_reopen); | |
e2f27e51 AM |
14899 | + if (finfo->fi_hdir) |
14900 | + /* harmless if err */ | |
14901 | + au_fidir_realloc(finfo, nbr, /*may_shrink*/1); | |
027c5e7a | 14902 | + if (!err && need_reopen && !d_unlinked(dentry)) |
4a4d8108 AM |
14903 | + err = reopen(file); |
14904 | + if (!err) { | |
14905 | + au_update_figen(file); | |
14906 | + goto out; /* success */ | |
14907 | + } | |
14908 | + | |
14909 | + /* error, close all lower files */ | |
14910 | + if (finfo->fi_hdir) { | |
5afbbe0d AM |
14911 | + bbot = au_fbbot_dir(file); |
14912 | + for (bindex = au_fbtop(file); bindex <= bbot; bindex++) | |
4a4d8108 AM |
14913 | + au_set_h_fptr(file, bindex, NULL); |
14914 | + } | |
1facf9fc | 14915 | + |
4f0767ce | 14916 | +out: |
1facf9fc | 14917 | + return err; |
14918 | +} | |
14919 | + | |
4a4d8108 AM |
14920 | +/* common function to regular file and dir */ |
14921 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
521ced18 | 14922 | + int wlock, unsigned int fi_lsc) |
dece6358 | 14923 | +{ |
1308ab2a | 14924 | + int err; |
4a4d8108 | 14925 | + unsigned int sigen, figen; |
5afbbe0d | 14926 | + aufs_bindex_t btop; |
4a4d8108 AM |
14927 | + unsigned char pseudo_link; |
14928 | + struct dentry *dentry; | |
14929 | + struct inode *inode; | |
1facf9fc | 14930 | + |
4a4d8108 | 14931 | + err = 0; |
2000de60 | 14932 | + dentry = file->f_path.dentry; |
5527c038 | 14933 | + inode = d_inode(dentry); |
4a4d8108 | 14934 | + sigen = au_sigen(dentry->d_sb); |
521ced18 | 14935 | + fi_write_lock_nested(file, fi_lsc); |
4a4d8108 | 14936 | + figen = au_figen(file); |
521ced18 JR |
14937 | + if (!fi_lsc) |
14938 | + di_write_lock_child(dentry); | |
14939 | + else | |
14940 | + di_write_lock_child2(dentry); | |
5afbbe0d AM |
14941 | + btop = au_dbtop(dentry); |
14942 | + pseudo_link = (btop != au_ibtop(inode)); | |
14943 | + if (sigen == figen && !pseudo_link && au_fbtop(file) == btop) { | |
4a4d8108 AM |
14944 | + if (!wlock) { |
14945 | + di_downgrade_lock(dentry, AuLock_IR); | |
14946 | + fi_downgrade_lock(file); | |
14947 | + } | |
14948 | + goto out; /* success */ | |
14949 | + } | |
dece6358 | 14950 | + |
4a4d8108 | 14951 | + AuDbg("sigen %d, figen %d\n", sigen, figen); |
027c5e7a | 14952 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 | 14953 | + err = au_reval_dpath(dentry, sigen); |
027c5e7a | 14954 | + AuDebugOn(!err && au_digen_test(dentry, sigen)); |
4a4d8108 | 14955 | + } |
dece6358 | 14956 | + |
027c5e7a AM |
14957 | + if (!err) |
14958 | + err = refresh_file(file, reopen); | |
4a4d8108 AM |
14959 | + if (!err) { |
14960 | + if (!wlock) { | |
14961 | + di_downgrade_lock(dentry, AuLock_IR); | |
14962 | + fi_downgrade_lock(file); | |
14963 | + } | |
14964 | + } else { | |
14965 | + di_write_unlock(dentry); | |
14966 | + fi_write_unlock(file); | |
14967 | + } | |
1facf9fc | 14968 | + |
4f0767ce | 14969 | +out: |
1308ab2a | 14970 | + return err; |
14971 | +} | |
1facf9fc | 14972 | + |
4a4d8108 AM |
14973 | +/* ---------------------------------------------------------------------- */ |
14974 | + | |
14975 | +/* cf. aufs_nopage() */ | |
14976 | +/* for madvise(2) */ | |
14977 | +static int aufs_readpage(struct file *file __maybe_unused, struct page *page) | |
1308ab2a | 14978 | +{ |
4a4d8108 AM |
14979 | + unlock_page(page); |
14980 | + return 0; | |
14981 | +} | |
1facf9fc | 14982 | + |
4a4d8108 | 14983 | +/* it will never be called, but necessary to support O_DIRECT */ |
5afbbe0d | 14984 | +static ssize_t aufs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
4a4d8108 | 14985 | +{ BUG(); return 0; } |
1facf9fc | 14986 | + |
4a4d8108 AM |
14987 | +/* they will never be called. */ |
14988 | +#ifdef CONFIG_AUFS_DEBUG | |
14989 | +static int aufs_write_begin(struct file *file, struct address_space *mapping, | |
14990 | + loff_t pos, unsigned len, unsigned flags, | |
14991 | + struct page **pagep, void **fsdata) | |
14992 | +{ AuUnsupport(); return 0; } | |
14993 | +static int aufs_write_end(struct file *file, struct address_space *mapping, | |
14994 | + loff_t pos, unsigned len, unsigned copied, | |
14995 | + struct page *page, void *fsdata) | |
14996 | +{ AuUnsupport(); return 0; } | |
14997 | +static int aufs_writepage(struct page *page, struct writeback_control *wbc) | |
14998 | +{ AuUnsupport(); return 0; } | |
1308ab2a | 14999 | + |
4a4d8108 AM |
15000 | +static int aufs_set_page_dirty(struct page *page) |
15001 | +{ AuUnsupport(); return 0; } | |
392086de AM |
15002 | +static void aufs_invalidatepage(struct page *page, unsigned int offset, |
15003 | + unsigned int length) | |
4a4d8108 AM |
15004 | +{ AuUnsupport(); } |
15005 | +static int aufs_releasepage(struct page *page, gfp_t gfp) | |
15006 | +{ AuUnsupport(); return 0; } | |
79b8bda9 | 15007 | +#if 0 /* called by memory compaction regardless file */ |
4a4d8108 | 15008 | +static int aufs_migratepage(struct address_space *mapping, struct page *newpage, |
7eafdf33 | 15009 | + struct page *page, enum migrate_mode mode) |
4a4d8108 | 15010 | +{ AuUnsupport(); return 0; } |
79b8bda9 | 15011 | +#endif |
e2f27e51 AM |
15012 | +static bool aufs_isolate_page(struct page *page, isolate_mode_t mode) |
15013 | +{ AuUnsupport(); return true; } | |
15014 | +static void aufs_putback_page(struct page *page) | |
15015 | +{ AuUnsupport(); } | |
4a4d8108 AM |
15016 | +static int aufs_launder_page(struct page *page) |
15017 | +{ AuUnsupport(); return 0; } | |
15018 | +static int aufs_is_partially_uptodate(struct page *page, | |
38d290e6 JR |
15019 | + unsigned long from, |
15020 | + unsigned long count) | |
4a4d8108 | 15021 | +{ AuUnsupport(); return 0; } |
392086de AM |
15022 | +static void aufs_is_dirty_writeback(struct page *page, bool *dirty, |
15023 | + bool *writeback) | |
15024 | +{ AuUnsupport(); } | |
4a4d8108 AM |
15025 | +static int aufs_error_remove_page(struct address_space *mapping, |
15026 | + struct page *page) | |
15027 | +{ AuUnsupport(); return 0; } | |
b4510431 AM |
15028 | +static int aufs_swap_activate(struct swap_info_struct *sis, struct file *file, |
15029 | + sector_t *span) | |
15030 | +{ AuUnsupport(); return 0; } | |
15031 | +static void aufs_swap_deactivate(struct file *file) | |
15032 | +{ AuUnsupport(); } | |
4a4d8108 AM |
15033 | +#endif /* CONFIG_AUFS_DEBUG */ |
15034 | + | |
15035 | +const struct address_space_operations aufs_aop = { | |
15036 | + .readpage = aufs_readpage, | |
15037 | + .direct_IO = aufs_direct_IO, | |
4a4d8108 AM |
15038 | +#ifdef CONFIG_AUFS_DEBUG |
15039 | + .writepage = aufs_writepage, | |
4a4d8108 AM |
15040 | + /* no writepages, because of writepage */ |
15041 | + .set_page_dirty = aufs_set_page_dirty, | |
15042 | + /* no readpages, because of readpage */ | |
15043 | + .write_begin = aufs_write_begin, | |
15044 | + .write_end = aufs_write_end, | |
15045 | + /* no bmap, no block device */ | |
15046 | + .invalidatepage = aufs_invalidatepage, | |
15047 | + .releasepage = aufs_releasepage, | |
79b8bda9 AM |
15048 | + /* is fallback_migrate_page ok? */ |
15049 | + /* .migratepage = aufs_migratepage, */ | |
e2f27e51 AM |
15050 | + .isolate_page = aufs_isolate_page, |
15051 | + .putback_page = aufs_putback_page, | |
4a4d8108 AM |
15052 | + .launder_page = aufs_launder_page, |
15053 | + .is_partially_uptodate = aufs_is_partially_uptodate, | |
392086de | 15054 | + .is_dirty_writeback = aufs_is_dirty_writeback, |
b4510431 AM |
15055 | + .error_remove_page = aufs_error_remove_page, |
15056 | + .swap_activate = aufs_swap_activate, | |
15057 | + .swap_deactivate = aufs_swap_deactivate | |
4a4d8108 | 15058 | +#endif /* CONFIG_AUFS_DEBUG */ |
dece6358 | 15059 | +}; |
7f207e10 AM |
15060 | diff -urN /usr/share/empty/fs/aufs/file.h linux/fs/aufs/file.h |
15061 | --- /usr/share/empty/fs/aufs/file.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 15062 | +++ linux/fs/aufs/file.h 2018-08-12 23:43:05.456791299 +0200 |
062440b3 AM |
15063 | @@ -0,0 +1,341 @@ |
15064 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
4a4d8108 | 15065 | +/* |
b00004a5 | 15066 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
15067 | + * |
15068 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15069 | + * it under the terms of the GNU General Public License as published by | |
15070 | + * the Free Software Foundation; either version 2 of the License, or | |
15071 | + * (at your option) any later version. | |
15072 | + * | |
15073 | + * This program is distributed in the hope that it will be useful, | |
15074 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15075 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15076 | + * GNU General Public License for more details. | |
15077 | + * | |
15078 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15079 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 15080 | + */ |
1facf9fc | 15081 | + |
4a4d8108 AM |
15082 | +/* |
15083 | + * file operations | |
15084 | + */ | |
1facf9fc | 15085 | + |
4a4d8108 AM |
15086 | +#ifndef __AUFS_FILE_H__ |
15087 | +#define __AUFS_FILE_H__ | |
1facf9fc | 15088 | + |
4a4d8108 | 15089 | +#ifdef __KERNEL__ |
1facf9fc | 15090 | + |
2cbb1c4b | 15091 | +#include <linux/file.h> |
4a4d8108 | 15092 | +#include <linux/fs.h> |
3c1bdaff | 15093 | +#include <linux/mm_types.h> |
4a4d8108 | 15094 | +#include <linux/poll.h> |
4a4d8108 | 15095 | +#include "rwsem.h" |
1facf9fc | 15096 | + |
4a4d8108 AM |
15097 | +struct au_branch; |
15098 | +struct au_hfile { | |
15099 | + struct file *hf_file; | |
15100 | + struct au_branch *hf_br; | |
15101 | +}; | |
1facf9fc | 15102 | + |
4a4d8108 AM |
15103 | +struct au_vdir; |
15104 | +struct au_fidir { | |
15105 | + aufs_bindex_t fd_bbot; | |
15106 | + aufs_bindex_t fd_nent; | |
15107 | + struct au_vdir *fd_vdir_cache; | |
15108 | + struct au_hfile fd_hfile[]; | |
15109 | +}; | |
1facf9fc | 15110 | + |
4a4d8108 | 15111 | +static inline int au_fidir_sz(int nent) |
dece6358 | 15112 | +{ |
4f0767ce JR |
15113 | + AuDebugOn(nent < 0); |
15114 | + return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent; | |
4a4d8108 | 15115 | +} |
1facf9fc | 15116 | + |
4a4d8108 AM |
15117 | +struct au_finfo { |
15118 | + atomic_t fi_generation; | |
dece6358 | 15119 | + |
4a4d8108 AM |
15120 | + struct au_rwsem fi_rwsem; |
15121 | + aufs_bindex_t fi_btop; | |
15122 | + | |
15123 | + /* do not union them */ | |
15124 | + struct { /* for non-dir */ | |
15125 | + struct au_hfile fi_htop; | |
2cbb1c4b | 15126 | + atomic_t fi_mmapped; |
4a4d8108 AM |
15127 | + }; |
15128 | + struct au_fidir *fi_hdir; /* for dir only */ | |
523b37e3 | 15129 | + |
8b6a4947 | 15130 | + struct hlist_bl_node fi_hlist; |
1c60b727 | 15131 | + struct file *fi_file; /* very ugly */ |
4a4d8108 | 15132 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 15133 | + |
4a4d8108 | 15134 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15135 | + |
4a4d8108 AM |
15136 | +/* file.c */ |
15137 | +extern const struct address_space_operations aufs_aop; | |
15138 | +unsigned int au_file_roflags(unsigned int flags); | |
15139 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
392086de | 15140 | + struct file *file, int force_wr); |
b912730e | 15141 | +struct au_do_open_args { |
8b6a4947 | 15142 | + int aopen; |
b912730e AM |
15143 | + int (*open)(struct file *file, int flags, |
15144 | + struct file *h_file); | |
15145 | + struct au_fidir *fidir; | |
15146 | + struct file *h_file; | |
15147 | +}; | |
15148 | +int au_do_open(struct file *file, struct au_do_open_args *args); | |
4a4d8108 AM |
15149 | +int au_reopen_nondir(struct file *file); |
15150 | +struct au_pin; | |
15151 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin); | |
15152 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
521ced18 | 15153 | + int wlock, unsigned int fi_lsc); |
4a4d8108 AM |
15154 | +int au_do_flush(struct file *file, fl_owner_t id, |
15155 | + int (*flush)(struct file *file, fl_owner_t id)); | |
1facf9fc | 15156 | + |
4a4d8108 AM |
15157 | +/* poll.c */ |
15158 | +#ifdef CONFIG_AUFS_POLL | |
cd7a4cd9 | 15159 | +__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt); |
4a4d8108 | 15160 | +#endif |
1facf9fc | 15161 | + |
4a4d8108 AM |
15162 | +#ifdef CONFIG_AUFS_BR_HFSPLUS |
15163 | +/* hfsplus.c */ | |
392086de AM |
15164 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, |
15165 | + int force_wr); | |
4a4d8108 AM |
15166 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
15167 | + struct file *h_file); | |
15168 | +#else | |
c1595e42 JR |
15169 | +AuStub(struct file *, au_h_open_pre, return NULL, struct dentry *dentry, |
15170 | + aufs_bindex_t bindex, int force_wr) | |
4a4d8108 AM |
15171 | +AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex, |
15172 | + struct file *h_file); | |
15173 | +#endif | |
1facf9fc | 15174 | + |
4a4d8108 AM |
15175 | +/* f_op.c */ |
15176 | +extern const struct file_operations aufs_file_fop; | |
b912730e | 15177 | +int au_do_open_nondir(struct file *file, int flags, struct file *h_file); |
4a4d8108 | 15178 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file); |
521ced18 | 15179 | +struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc); |
4a4d8108 | 15180 | + |
4a4d8108 | 15181 | +/* finfo.c */ |
f0c0a007 | 15182 | +void au_hfput(struct au_hfile *hf, int execed); |
4a4d8108 AM |
15183 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, |
15184 | + struct file *h_file); | |
1facf9fc | 15185 | + |
4a4d8108 | 15186 | +void au_update_figen(struct file *file); |
4a4d8108 | 15187 | +struct au_fidir *au_fidir_alloc(struct super_block *sb); |
e2f27e51 | 15188 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink); |
1facf9fc | 15189 | + |
4a4d8108 | 15190 | +void au_fi_init_once(void *_fi); |
1c60b727 | 15191 | +void au_finfo_fin(struct file *file); |
4a4d8108 | 15192 | +int au_finfo_init(struct file *file, struct au_fidir *fidir); |
1facf9fc | 15193 | + |
4a4d8108 AM |
15194 | +/* ioctl.c */ |
15195 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
15196 | +#ifdef CONFIG_COMPAT |
15197 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
15198 | + unsigned long arg); | |
c2b27bf2 AM |
15199 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, |
15200 | + unsigned long arg); | |
b752ccd1 | 15201 | +#endif |
1facf9fc | 15202 | + |
4a4d8108 | 15203 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15204 | + |
4a4d8108 AM |
15205 | +static inline struct au_finfo *au_fi(struct file *file) |
15206 | +{ | |
38d290e6 | 15207 | + return file->private_data; |
4a4d8108 | 15208 | +} |
1facf9fc | 15209 | + |
4a4d8108 | 15210 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15211 | + |
8b6a4947 AM |
15212 | +#define fi_read_lock(f) au_rw_read_lock(&au_fi(f)->fi_rwsem) |
15213 | +#define fi_write_lock(f) au_rw_write_lock(&au_fi(f)->fi_rwsem) | |
15214 | +#define fi_read_trylock(f) au_rw_read_trylock(&au_fi(f)->fi_rwsem) | |
15215 | +#define fi_write_trylock(f) au_rw_write_trylock(&au_fi(f)->fi_rwsem) | |
4a4d8108 | 15216 | +/* |
8b6a4947 AM |
15217 | +#define fi_read_trylock_nested(f) \ |
15218 | + au_rw_read_trylock_nested(&au_fi(f)->fi_rwsem) | |
15219 | +#define fi_write_trylock_nested(f) \ | |
15220 | + au_rw_write_trylock_nested(&au_fi(f)->fi_rwsem) | |
15221 | +*/ | |
15222 | + | |
15223 | +#define fi_read_unlock(f) au_rw_read_unlock(&au_fi(f)->fi_rwsem) | |
15224 | +#define fi_write_unlock(f) au_rw_write_unlock(&au_fi(f)->fi_rwsem) | |
15225 | +#define fi_downgrade_lock(f) au_rw_dgrade_lock(&au_fi(f)->fi_rwsem) | |
1308ab2a | 15226 | + |
521ced18 JR |
15227 | +/* lock subclass for finfo */ |
15228 | +enum { | |
15229 | + AuLsc_FI_1, | |
15230 | + AuLsc_FI_2 | |
15231 | +}; | |
15232 | + | |
15233 | +static inline void fi_read_lock_nested(struct file *f, unsigned int lsc) | |
15234 | +{ | |
15235 | + au_rw_read_lock_nested(&au_fi(f)->fi_rwsem, lsc); | |
15236 | +} | |
15237 | + | |
15238 | +static inline void fi_write_lock_nested(struct file *f, unsigned int lsc) | |
15239 | +{ | |
15240 | + au_rw_write_lock_nested(&au_fi(f)->fi_rwsem, lsc); | |
15241 | +} | |
15242 | + | |
15243 | +/* | |
15244 | + * fi_read_lock_1, fi_write_lock_1, | |
15245 | + * fi_read_lock_2, fi_write_lock_2 | |
15246 | + */ | |
15247 | +#define AuReadLockFunc(name) \ | |
15248 | +static inline void fi_read_lock_##name(struct file *f) \ | |
15249 | +{ fi_read_lock_nested(f, AuLsc_FI_##name); } | |
15250 | + | |
15251 | +#define AuWriteLockFunc(name) \ | |
15252 | +static inline void fi_write_lock_##name(struct file *f) \ | |
15253 | +{ fi_write_lock_nested(f, AuLsc_FI_##name); } | |
15254 | + | |
15255 | +#define AuRWLockFuncs(name) \ | |
15256 | + AuReadLockFunc(name) \ | |
15257 | + AuWriteLockFunc(name) | |
15258 | + | |
15259 | +AuRWLockFuncs(1); | |
15260 | +AuRWLockFuncs(2); | |
15261 | + | |
15262 | +#undef AuReadLockFunc | |
15263 | +#undef AuWriteLockFunc | |
15264 | +#undef AuRWLockFuncs | |
15265 | + | |
4a4d8108 AM |
15266 | +#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem) |
15267 | +#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem) | |
15268 | +#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem) | |
1facf9fc | 15269 | + |
1308ab2a | 15270 | +/* ---------------------------------------------------------------------- */ |
15271 | + | |
4a4d8108 | 15272 | +/* todo: hard/soft set? */ |
5afbbe0d | 15273 | +static inline aufs_bindex_t au_fbtop(struct file *file) |
dece6358 | 15274 | +{ |
4a4d8108 AM |
15275 | + FiMustAnyLock(file); |
15276 | + return au_fi(file)->fi_btop; | |
15277 | +} | |
dece6358 | 15278 | + |
5afbbe0d | 15279 | +static inline aufs_bindex_t au_fbbot_dir(struct file *file) |
4a4d8108 AM |
15280 | +{ |
15281 | + FiMustAnyLock(file); | |
15282 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15283 | + return au_fi(file)->fi_hdir->fd_bbot; | |
15284 | +} | |
1facf9fc | 15285 | + |
4a4d8108 AM |
15286 | +static inline struct au_vdir *au_fvdir_cache(struct file *file) |
15287 | +{ | |
15288 | + FiMustAnyLock(file); | |
15289 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15290 | + return au_fi(file)->fi_hdir->fd_vdir_cache; | |
15291 | +} | |
1facf9fc | 15292 | + |
5afbbe0d | 15293 | +static inline void au_set_fbtop(struct file *file, aufs_bindex_t bindex) |
4a4d8108 AM |
15294 | +{ |
15295 | + FiMustWriteLock(file); | |
15296 | + au_fi(file)->fi_btop = bindex; | |
15297 | +} | |
1facf9fc | 15298 | + |
5afbbe0d | 15299 | +static inline void au_set_fbbot_dir(struct file *file, aufs_bindex_t bindex) |
4a4d8108 AM |
15300 | +{ |
15301 | + FiMustWriteLock(file); | |
15302 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15303 | + au_fi(file)->fi_hdir->fd_bbot = bindex; | |
15304 | +} | |
1308ab2a | 15305 | + |
4a4d8108 AM |
15306 | +static inline void au_set_fvdir_cache(struct file *file, |
15307 | + struct au_vdir *vdir_cache) | |
15308 | +{ | |
15309 | + FiMustWriteLock(file); | |
15310 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15311 | + au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache; | |
15312 | +} | |
dece6358 | 15313 | + |
4a4d8108 AM |
15314 | +static inline struct file *au_hf_top(struct file *file) |
15315 | +{ | |
15316 | + FiMustAnyLock(file); | |
15317 | + AuDebugOn(au_fi(file)->fi_hdir); | |
15318 | + return au_fi(file)->fi_htop.hf_file; | |
15319 | +} | |
1facf9fc | 15320 | + |
4a4d8108 AM |
15321 | +static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex) |
15322 | +{ | |
15323 | + FiMustAnyLock(file); | |
15324 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
15325 | + return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file; | |
dece6358 AM |
15326 | +} |
15327 | + | |
4a4d8108 AM |
15328 | +/* todo: memory barrier? */ |
15329 | +static inline unsigned int au_figen(struct file *f) | |
dece6358 | 15330 | +{ |
4a4d8108 AM |
15331 | + return atomic_read(&au_fi(f)->fi_generation); |
15332 | +} | |
dece6358 | 15333 | + |
2cbb1c4b JR |
15334 | +static inline void au_set_mmapped(struct file *f) |
15335 | +{ | |
15336 | + if (atomic_inc_return(&au_fi(f)->fi_mmapped)) | |
15337 | + return; | |
0c3ec466 | 15338 | + pr_warn("fi_mmapped wrapped around\n"); |
2cbb1c4b JR |
15339 | + while (!atomic_inc_return(&au_fi(f)->fi_mmapped)) |
15340 | + ; | |
15341 | +} | |
15342 | + | |
15343 | +static inline void au_unset_mmapped(struct file *f) | |
15344 | +{ | |
15345 | + atomic_dec(&au_fi(f)->fi_mmapped); | |
15346 | +} | |
15347 | + | |
4a4d8108 AM |
15348 | +static inline int au_test_mmapped(struct file *f) |
15349 | +{ | |
2cbb1c4b JR |
15350 | + return atomic_read(&au_fi(f)->fi_mmapped); |
15351 | +} | |
15352 | + | |
15353 | +/* customize vma->vm_file */ | |
15354 | + | |
15355 | +static inline void au_do_vm_file_reset(struct vm_area_struct *vma, | |
15356 | + struct file *file) | |
15357 | +{ | |
53392da6 AM |
15358 | + struct file *f; |
15359 | + | |
15360 | + f = vma->vm_file; | |
2cbb1c4b JR |
15361 | + get_file(file); |
15362 | + vma->vm_file = file; | |
53392da6 | 15363 | + fput(f); |
2cbb1c4b JR |
15364 | +} |
15365 | + | |
15366 | +#ifdef CONFIG_MMU | |
15367 | +#define AuDbgVmRegion(file, vma) do {} while (0) | |
15368 | + | |
15369 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
15370 | + struct file *file) | |
15371 | +{ | |
15372 | + au_do_vm_file_reset(vma, file); | |
15373 | +} | |
15374 | +#else | |
15375 | +#define AuDbgVmRegion(file, vma) \ | |
15376 | + AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file)) | |
15377 | + | |
15378 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
15379 | + struct file *file) | |
15380 | +{ | |
53392da6 AM |
15381 | + struct file *f; |
15382 | + | |
2cbb1c4b | 15383 | + au_do_vm_file_reset(vma, file); |
53392da6 | 15384 | + f = vma->vm_region->vm_file; |
2cbb1c4b JR |
15385 | + get_file(file); |
15386 | + vma->vm_region->vm_file = file; | |
53392da6 | 15387 | + fput(f); |
2cbb1c4b JR |
15388 | +} |
15389 | +#endif /* CONFIG_MMU */ | |
15390 | + | |
15391 | +/* handle vma->vm_prfile */ | |
fb47a38f | 15392 | +static inline void au_vm_prfile_set(struct vm_area_struct *vma, |
2cbb1c4b JR |
15393 | + struct file *file) |
15394 | +{ | |
2cbb1c4b JR |
15395 | + get_file(file); |
15396 | + vma->vm_prfile = file; | |
15397 | +#ifndef CONFIG_MMU | |
15398 | + get_file(file); | |
15399 | + vma->vm_region->vm_prfile = file; | |
15400 | +#endif | |
fb47a38f | 15401 | +} |
1308ab2a | 15402 | + |
4a4d8108 AM |
15403 | +#endif /* __KERNEL__ */ |
15404 | +#endif /* __AUFS_FILE_H__ */ | |
7f207e10 AM |
15405 | diff -urN /usr/share/empty/fs/aufs/finfo.c linux/fs/aufs/finfo.c |
15406 | --- /usr/share/empty/fs/aufs/finfo.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 15407 | +++ linux/fs/aufs/finfo.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 15408 | @@ -0,0 +1,149 @@ |
cd7a4cd9 | 15409 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 15410 | +/* |
b00004a5 | 15411 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
15412 | + * |
15413 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15414 | + * it under the terms of the GNU General Public License as published by | |
15415 | + * the Free Software Foundation; either version 2 of the License, or | |
15416 | + * (at your option) any later version. | |
15417 | + * | |
15418 | + * This program is distributed in the hope that it will be useful, | |
15419 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15420 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15421 | + * GNU General Public License for more details. | |
15422 | + * | |
15423 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15424 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 15425 | + */ |
1308ab2a | 15426 | + |
4a4d8108 AM |
15427 | +/* |
15428 | + * file private data | |
15429 | + */ | |
1facf9fc | 15430 | + |
4a4d8108 | 15431 | +#include "aufs.h" |
1facf9fc | 15432 | + |
f0c0a007 | 15433 | +void au_hfput(struct au_hfile *hf, int execed) |
4a4d8108 | 15434 | +{ |
f0c0a007 | 15435 | + if (execed) |
4a4d8108 AM |
15436 | + allow_write_access(hf->hf_file); |
15437 | + fput(hf->hf_file); | |
15438 | + hf->hf_file = NULL; | |
5afbbe0d | 15439 | + au_br_put(hf->hf_br); |
4a4d8108 AM |
15440 | + hf->hf_br = NULL; |
15441 | +} | |
1facf9fc | 15442 | + |
4a4d8108 AM |
15443 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val) |
15444 | +{ | |
15445 | + struct au_finfo *finfo = au_fi(file); | |
15446 | + struct au_hfile *hf; | |
15447 | + struct au_fidir *fidir; | |
15448 | + | |
15449 | + fidir = finfo->fi_hdir; | |
15450 | + if (!fidir) { | |
15451 | + AuDebugOn(finfo->fi_btop != bindex); | |
15452 | + hf = &finfo->fi_htop; | |
15453 | + } else | |
15454 | + hf = fidir->fd_hfile + bindex; | |
15455 | + | |
15456 | + if (hf && hf->hf_file) | |
f0c0a007 | 15457 | + au_hfput(hf, vfsub_file_execed(file)); |
4a4d8108 AM |
15458 | + if (val) { |
15459 | + FiMustWriteLock(file); | |
b912730e | 15460 | + AuDebugOn(IS_ERR_OR_NULL(file->f_path.dentry)); |
4a4d8108 | 15461 | + hf->hf_file = val; |
2000de60 | 15462 | + hf->hf_br = au_sbr(file->f_path.dentry->d_sb, bindex); |
1308ab2a | 15463 | + } |
4a4d8108 | 15464 | +} |
1facf9fc | 15465 | + |
4a4d8108 AM |
15466 | +void au_update_figen(struct file *file) |
15467 | +{ | |
2000de60 | 15468 | + atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_path.dentry)); |
4a4d8108 | 15469 | + /* smp_mb(); */ /* atomic_set */ |
1facf9fc | 15470 | +} |
15471 | + | |
4a4d8108 AM |
15472 | +/* ---------------------------------------------------------------------- */ |
15473 | + | |
4a4d8108 AM |
15474 | +struct au_fidir *au_fidir_alloc(struct super_block *sb) |
15475 | +{ | |
15476 | + struct au_fidir *fidir; | |
15477 | + int nbr; | |
15478 | + | |
5afbbe0d | 15479 | + nbr = au_sbbot(sb) + 1; |
4a4d8108 AM |
15480 | + if (nbr < 2) |
15481 | + nbr = 2; /* initial allocate for 2 branches */ | |
15482 | + fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS); | |
15483 | + if (fidir) { | |
15484 | + fidir->fd_bbot = -1; | |
15485 | + fidir->fd_nent = nbr; | |
4a4d8108 AM |
15486 | + } |
15487 | + | |
15488 | + return fidir; | |
15489 | +} | |
15490 | + | |
e2f27e51 | 15491 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr, int may_shrink) |
4a4d8108 AM |
15492 | +{ |
15493 | + int err; | |
15494 | + struct au_fidir *fidir, *p; | |
15495 | + | |
15496 | + AuRwMustWriteLock(&finfo->fi_rwsem); | |
15497 | + fidir = finfo->fi_hdir; | |
15498 | + AuDebugOn(!fidir); | |
15499 | + | |
15500 | + err = -ENOMEM; | |
15501 | + p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr), | |
e2f27e51 | 15502 | + GFP_NOFS, may_shrink); |
4a4d8108 AM |
15503 | + if (p) { |
15504 | + p->fd_nent = nbr; | |
15505 | + finfo->fi_hdir = p; | |
15506 | + err = 0; | |
15507 | + } | |
1facf9fc | 15508 | + |
dece6358 | 15509 | + return err; |
1facf9fc | 15510 | +} |
1308ab2a | 15511 | + |
15512 | +/* ---------------------------------------------------------------------- */ | |
15513 | + | |
1c60b727 | 15514 | +void au_finfo_fin(struct file *file) |
1308ab2a | 15515 | +{ |
4a4d8108 AM |
15516 | + struct au_finfo *finfo; |
15517 | + | |
2000de60 | 15518 | + au_nfiles_dec(file->f_path.dentry->d_sb); |
7f207e10 | 15519 | + |
4a4d8108 AM |
15520 | + finfo = au_fi(file); |
15521 | + AuDebugOn(finfo->fi_hdir); | |
15522 | + AuRwDestroy(&finfo->fi_rwsem); | |
1c60b727 | 15523 | + au_cache_free_finfo(finfo); |
1308ab2a | 15524 | +} |
1308ab2a | 15525 | + |
e49829fe | 15526 | +void au_fi_init_once(void *_finfo) |
4a4d8108 | 15527 | +{ |
e49829fe | 15528 | + struct au_finfo *finfo = _finfo; |
1308ab2a | 15529 | + |
e49829fe | 15530 | + au_rw_init(&finfo->fi_rwsem); |
4a4d8108 | 15531 | +} |
1308ab2a | 15532 | + |
4a4d8108 AM |
15533 | +int au_finfo_init(struct file *file, struct au_fidir *fidir) |
15534 | +{ | |
1716fcea | 15535 | + int err; |
4a4d8108 AM |
15536 | + struct au_finfo *finfo; |
15537 | + struct dentry *dentry; | |
15538 | + | |
15539 | + err = -ENOMEM; | |
2000de60 | 15540 | + dentry = file->f_path.dentry; |
4a4d8108 AM |
15541 | + finfo = au_cache_alloc_finfo(); |
15542 | + if (unlikely(!finfo)) | |
15543 | + goto out; | |
15544 | + | |
15545 | + err = 0; | |
7f207e10 | 15546 | + au_nfiles_inc(dentry->d_sb); |
4a4d8108 AM |
15547 | + au_rw_write_lock(&finfo->fi_rwsem); |
15548 | + finfo->fi_btop = -1; | |
15549 | + finfo->fi_hdir = fidir; | |
15550 | + atomic_set(&finfo->fi_generation, au_digen(dentry)); | |
15551 | + /* smp_mb(); */ /* atomic_set */ | |
15552 | + | |
15553 | + file->private_data = finfo; | |
15554 | + | |
15555 | +out: | |
15556 | + return err; | |
15557 | +} | |
7f207e10 AM |
15558 | diff -urN /usr/share/empty/fs/aufs/f_op.c linux/fs/aufs/f_op.c |
15559 | --- /usr/share/empty/fs/aufs/f_op.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 15560 | +++ linux/fs/aufs/f_op.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 15561 | @@ -0,0 +1,818 @@ |
cd7a4cd9 | 15562 | +// SPDX-License-Identifier: GPL-2.0 |
dece6358 | 15563 | +/* |
b00004a5 | 15564 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
dece6358 AM |
15565 | + * |
15566 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15567 | + * it under the terms of the GNU General Public License as published by | |
15568 | + * the Free Software Foundation; either version 2 of the License, or | |
15569 | + * (at your option) any later version. | |
15570 | + * | |
15571 | + * This program is distributed in the hope that it will be useful, | |
15572 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15573 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15574 | + * GNU General Public License for more details. | |
15575 | + * | |
15576 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 15577 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 | 15578 | + */ |
1facf9fc | 15579 | + |
15580 | +/* | |
4a4d8108 | 15581 | + * file and vm operations |
1facf9fc | 15582 | + */ |
dece6358 | 15583 | + |
86dc4139 | 15584 | +#include <linux/aio.h> |
4a4d8108 AM |
15585 | +#include <linux/fs_stack.h> |
15586 | +#include <linux/mman.h> | |
4a4d8108 | 15587 | +#include <linux/security.h> |
dece6358 AM |
15588 | +#include "aufs.h" |
15589 | + | |
b912730e | 15590 | +int au_do_open_nondir(struct file *file, int flags, struct file *h_file) |
1facf9fc | 15591 | +{ |
4a4d8108 AM |
15592 | + int err; |
15593 | + aufs_bindex_t bindex; | |
8cdd5066 | 15594 | + struct dentry *dentry, *h_dentry; |
4a4d8108 | 15595 | + struct au_finfo *finfo; |
38d290e6 | 15596 | + struct inode *h_inode; |
4a4d8108 AM |
15597 | + |
15598 | + FiMustWriteLock(file); | |
15599 | + | |
523b37e3 | 15600 | + err = 0; |
2000de60 | 15601 | + dentry = file->f_path.dentry; |
b912730e | 15602 | + AuDebugOn(IS_ERR_OR_NULL(dentry)); |
4a4d8108 AM |
15603 | + finfo = au_fi(file); |
15604 | + memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop)); | |
2cbb1c4b | 15605 | + atomic_set(&finfo->fi_mmapped, 0); |
5afbbe0d | 15606 | + bindex = au_dbtop(dentry); |
8cdd5066 JR |
15607 | + if (!h_file) { |
15608 | + h_dentry = au_h_dptr(dentry, bindex); | |
15609 | + err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); | |
15610 | + if (unlikely(err)) | |
15611 | + goto out; | |
b912730e | 15612 | + h_file = au_h_open(dentry, bindex, flags, file, /*force_wr*/0); |
8cdd5066 JR |
15613 | + } else { |
15614 | + h_dentry = h_file->f_path.dentry; | |
15615 | + err = vfsub_test_mntns(file->f_path.mnt, h_dentry->d_sb); | |
15616 | + if (unlikely(err)) | |
15617 | + goto out; | |
b912730e | 15618 | + get_file(h_file); |
8cdd5066 | 15619 | + } |
4a4d8108 AM |
15620 | + if (IS_ERR(h_file)) |
15621 | + err = PTR_ERR(h_file); | |
15622 | + else { | |
38d290e6 JR |
15623 | + if ((flags & __O_TMPFILE) |
15624 | + && !(flags & O_EXCL)) { | |
15625 | + h_inode = file_inode(h_file); | |
15626 | + spin_lock(&h_inode->i_lock); | |
15627 | + h_inode->i_state |= I_LINKABLE; | |
15628 | + spin_unlock(&h_inode->i_lock); | |
15629 | + } | |
5afbbe0d | 15630 | + au_set_fbtop(file, bindex); |
4a4d8108 AM |
15631 | + au_set_h_fptr(file, bindex, h_file); |
15632 | + au_update_figen(file); | |
15633 | + /* todo: necessary? */ | |
15634 | + /* file->f_ra = h_file->f_ra; */ | |
15635 | + } | |
027c5e7a | 15636 | + |
8cdd5066 | 15637 | +out: |
4a4d8108 | 15638 | + return err; |
1facf9fc | 15639 | +} |
15640 | + | |
4a4d8108 AM |
15641 | +static int aufs_open_nondir(struct inode *inode __maybe_unused, |
15642 | + struct file *file) | |
1facf9fc | 15643 | +{ |
4a4d8108 | 15644 | + int err; |
1308ab2a | 15645 | + struct super_block *sb; |
b912730e AM |
15646 | + struct au_do_open_args args = { |
15647 | + .open = au_do_open_nondir | |
15648 | + }; | |
1facf9fc | 15649 | + |
523b37e3 AM |
15650 | + AuDbg("%pD, f_flags 0x%x, f_mode 0x%x\n", |
15651 | + file, vfsub_file_flags(file), file->f_mode); | |
1facf9fc | 15652 | + |
2000de60 | 15653 | + sb = file->f_path.dentry->d_sb; |
4a4d8108 | 15654 | + si_read_lock(sb, AuLock_FLUSH); |
b912730e | 15655 | + err = au_do_open(file, &args); |
4a4d8108 AM |
15656 | + si_read_unlock(sb); |
15657 | + return err; | |
15658 | +} | |
1facf9fc | 15659 | + |
4a4d8108 AM |
15660 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file) |
15661 | +{ | |
15662 | + struct au_finfo *finfo; | |
15663 | + aufs_bindex_t bindex; | |
1facf9fc | 15664 | + |
4a4d8108 | 15665 | + finfo = au_fi(file); |
8b6a4947 AM |
15666 | + au_hbl_del(&finfo->fi_hlist, |
15667 | + &au_sbi(file->f_path.dentry->d_sb)->si_files); | |
4a4d8108 | 15668 | + bindex = finfo->fi_btop; |
b4510431 | 15669 | + if (bindex >= 0) |
4a4d8108 | 15670 | + au_set_h_fptr(file, bindex, NULL); |
7f207e10 | 15671 | + |
1c60b727 | 15672 | + au_finfo_fin(file); |
4a4d8108 | 15673 | + return 0; |
1facf9fc | 15674 | +} |
15675 | + | |
4a4d8108 AM |
15676 | +/* ---------------------------------------------------------------------- */ |
15677 | + | |
15678 | +static int au_do_flush_nondir(struct file *file, fl_owner_t id) | |
dece6358 | 15679 | +{ |
1308ab2a | 15680 | + int err; |
4a4d8108 AM |
15681 | + struct file *h_file; |
15682 | + | |
15683 | + err = 0; | |
15684 | + h_file = au_hf_top(file); | |
15685 | + if (h_file) | |
15686 | + err = vfsub_flush(h_file, id); | |
15687 | + return err; | |
15688 | +} | |
15689 | + | |
15690 | +static int aufs_flush_nondir(struct file *file, fl_owner_t id) | |
15691 | +{ | |
15692 | + return au_do_flush(file, id, au_do_flush_nondir); | |
15693 | +} | |
15694 | + | |
15695 | +/* ---------------------------------------------------------------------- */ | |
9dbd164d AM |
15696 | +/* |
15697 | + * read and write functions acquire [fdi]_rwsem once, but release before | |
15698 | + * mmap_sem. This is because to stop a race condition between mmap(2). | |
15699 | + * Releasing these aufs-rwsem should be safe, no branch-mamagement (by keeping | |
15700 | + * si_rwsem), no harmful copy-up should happen. Actually copy-up may happen in | |
15701 | + * read functions after [fdi]_rwsem are released, but it should be harmless. | |
15702 | + */ | |
4a4d8108 | 15703 | + |
b912730e | 15704 | +/* Callers should call au_read_post() or fput() in the end */ |
521ced18 | 15705 | +struct file *au_read_pre(struct file *file, int keep_fi, unsigned int lsc) |
4a4d8108 | 15706 | +{ |
4a4d8108 | 15707 | + struct file *h_file; |
b912730e | 15708 | + int err; |
1facf9fc | 15709 | + |
521ced18 | 15710 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0, lsc); |
b912730e AM |
15711 | + if (!err) { |
15712 | + di_read_unlock(file->f_path.dentry, AuLock_IR); | |
15713 | + h_file = au_hf_top(file); | |
15714 | + get_file(h_file); | |
15715 | + if (!keep_fi) | |
15716 | + fi_read_unlock(file); | |
15717 | + } else | |
15718 | + h_file = ERR_PTR(err); | |
15719 | + | |
15720 | + return h_file; | |
15721 | +} | |
15722 | + | |
15723 | +static void au_read_post(struct inode *inode, struct file *h_file) | |
15724 | +{ | |
15725 | + /* update without lock, I don't think it a problem */ | |
15726 | + fsstack_copy_attr_atime(inode, file_inode(h_file)); | |
15727 | + fput(h_file); | |
15728 | +} | |
15729 | + | |
15730 | +struct au_write_pre { | |
521ced18 JR |
15731 | + /* input */ |
15732 | + unsigned int lsc; | |
15733 | + | |
15734 | + /* output */ | |
b912730e | 15735 | + blkcnt_t blks; |
5afbbe0d | 15736 | + aufs_bindex_t btop; |
b912730e AM |
15737 | +}; |
15738 | + | |
15739 | +/* | |
15740 | + * return with iinfo is write-locked | |
15741 | + * callers should call au_write_post() or iinfo_write_unlock() + fput() in the | |
15742 | + * end | |
15743 | + */ | |
15744 | +static struct file *au_write_pre(struct file *file, int do_ready, | |
15745 | + struct au_write_pre *wpre) | |
15746 | +{ | |
15747 | + struct file *h_file; | |
15748 | + struct dentry *dentry; | |
15749 | + int err; | |
521ced18 | 15750 | + unsigned int lsc; |
b912730e AM |
15751 | + struct au_pin pin; |
15752 | + | |
521ced18 JR |
15753 | + lsc = 0; |
15754 | + if (wpre) | |
15755 | + lsc = wpre->lsc; | |
15756 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, lsc); | |
b912730e | 15757 | + h_file = ERR_PTR(err); |
dece6358 AM |
15758 | + if (unlikely(err)) |
15759 | + goto out; | |
1facf9fc | 15760 | + |
b912730e AM |
15761 | + dentry = file->f_path.dentry; |
15762 | + if (do_ready) { | |
15763 | + err = au_ready_to_write(file, -1, &pin); | |
15764 | + if (unlikely(err)) { | |
15765 | + h_file = ERR_PTR(err); | |
15766 | + di_write_unlock(dentry); | |
15767 | + goto out_fi; | |
15768 | + } | |
15769 | + } | |
15770 | + | |
15771 | + di_downgrade_lock(dentry, /*flags*/0); | |
15772 | + if (wpre) | |
5afbbe0d | 15773 | + wpre->btop = au_fbtop(file); |
4a4d8108 | 15774 | + h_file = au_hf_top(file); |
9dbd164d | 15775 | + get_file(h_file); |
b912730e AM |
15776 | + if (wpre) |
15777 | + wpre->blks = file_inode(h_file)->i_blocks; | |
15778 | + if (do_ready) | |
15779 | + au_unpin(&pin); | |
15780 | + di_read_unlock(dentry, /*flags*/0); | |
15781 | + | |
15782 | +out_fi: | |
15783 | + fi_write_unlock(file); | |
15784 | +out: | |
15785 | + return h_file; | |
15786 | +} | |
15787 | + | |
15788 | +static void au_write_post(struct inode *inode, struct file *h_file, | |
15789 | + struct au_write_pre *wpre, ssize_t written) | |
15790 | +{ | |
15791 | + struct inode *h_inode; | |
15792 | + | |
15793 | + au_cpup_attr_timesizes(inode); | |
5afbbe0d | 15794 | + AuDebugOn(au_ibtop(inode) != wpre->btop); |
b912730e AM |
15795 | + h_inode = file_inode(h_file); |
15796 | + inode->i_mode = h_inode->i_mode; | |
15797 | + ii_write_unlock(inode); | |
b912730e AM |
15798 | + /* AuDbg("blks %llu, %llu\n", (u64)blks, (u64)h_inode->i_blocks); */ |
15799 | + if (written > 0) | |
5afbbe0d | 15800 | + au_fhsm_wrote(inode->i_sb, wpre->btop, |
b912730e | 15801 | + /*force*/h_inode->i_blocks > wpre->blks); |
1c60b727 | 15802 | + fput(h_file); |
b912730e AM |
15803 | +} |
15804 | + | |
15805 | +static ssize_t aufs_read(struct file *file, char __user *buf, size_t count, | |
15806 | + loff_t *ppos) | |
15807 | +{ | |
15808 | + ssize_t err; | |
15809 | + struct inode *inode; | |
15810 | + struct file *h_file; | |
15811 | + struct super_block *sb; | |
15812 | + | |
15813 | + inode = file_inode(file); | |
15814 | + sb = inode->i_sb; | |
15815 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); | |
15816 | + | |
521ced18 | 15817 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
15818 | + err = PTR_ERR(h_file); |
15819 | + if (IS_ERR(h_file)) | |
15820 | + goto out; | |
9dbd164d AM |
15821 | + |
15822 | + /* filedata may be obsoleted by concurrent copyup, but no problem */ | |
4a4d8108 AM |
15823 | + err = vfsub_read_u(h_file, buf, count, ppos); |
15824 | + /* todo: necessary? */ | |
15825 | + /* file->f_ra = h_file->f_ra; */ | |
b912730e | 15826 | + au_read_post(inode, h_file); |
1308ab2a | 15827 | + |
4f0767ce | 15828 | +out: |
dece6358 AM |
15829 | + si_read_unlock(sb); |
15830 | + return err; | |
15831 | +} | |
1facf9fc | 15832 | + |
e49829fe JR |
15833 | +/* |
15834 | + * todo: very ugly | |
15835 | + * it locks both of i_mutex and si_rwsem for read in safe. | |
15836 | + * if the plink maintenance mode continues forever (that is the problem), | |
15837 | + * may loop forever. | |
15838 | + */ | |
15839 | +static void au_mtx_and_read_lock(struct inode *inode) | |
15840 | +{ | |
15841 | + int err; | |
15842 | + struct super_block *sb = inode->i_sb; | |
15843 | + | |
15844 | + while (1) { | |
febd17d6 | 15845 | + inode_lock(inode); |
e49829fe JR |
15846 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
15847 | + if (!err) | |
15848 | + break; | |
febd17d6 | 15849 | + inode_unlock(inode); |
e49829fe JR |
15850 | + si_read_lock(sb, AuLock_NOPLMW); |
15851 | + si_read_unlock(sb); | |
15852 | + } | |
15853 | +} | |
15854 | + | |
4a4d8108 AM |
15855 | +static ssize_t aufs_write(struct file *file, const char __user *ubuf, |
15856 | + size_t count, loff_t *ppos) | |
dece6358 | 15857 | +{ |
4a4d8108 | 15858 | + ssize_t err; |
b912730e AM |
15859 | + struct au_write_pre wpre; |
15860 | + struct inode *inode; | |
4a4d8108 AM |
15861 | + struct file *h_file; |
15862 | + char __user *buf = (char __user *)ubuf; | |
1facf9fc | 15863 | + |
b912730e | 15864 | + inode = file_inode(file); |
e49829fe | 15865 | + au_mtx_and_read_lock(inode); |
1facf9fc | 15866 | + |
521ced18 | 15867 | + wpre.lsc = 0; |
b912730e AM |
15868 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15869 | + err = PTR_ERR(h_file); | |
15870 | + if (IS_ERR(h_file)) | |
9dbd164d | 15871 | + goto out; |
9dbd164d | 15872 | + |
4a4d8108 | 15873 | + err = vfsub_write_u(h_file, buf, count, ppos); |
b912730e | 15874 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 15875 | + |
4f0767ce | 15876 | +out: |
b912730e | 15877 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15878 | + inode_unlock(inode); |
dece6358 AM |
15879 | + return err; |
15880 | +} | |
1facf9fc | 15881 | + |
076b876e AM |
15882 | +static ssize_t au_do_iter(struct file *h_file, int rw, struct kiocb *kio, |
15883 | + struct iov_iter *iov_iter) | |
dece6358 | 15884 | +{ |
4a4d8108 AM |
15885 | + ssize_t err; |
15886 | + struct file *file; | |
076b876e | 15887 | + ssize_t (*iter)(struct kiocb *, struct iov_iter *); |
1facf9fc | 15888 | + |
4a4d8108 AM |
15889 | + err = security_file_permission(h_file, rw); |
15890 | + if (unlikely(err)) | |
15891 | + goto out; | |
1facf9fc | 15892 | + |
4a4d8108 | 15893 | + err = -ENOSYS; |
076b876e | 15894 | + iter = NULL; |
5527c038 | 15895 | + if (rw == MAY_READ) |
076b876e | 15896 | + iter = h_file->f_op->read_iter; |
5527c038 | 15897 | + else if (rw == MAY_WRITE) |
076b876e | 15898 | + iter = h_file->f_op->write_iter; |
076b876e AM |
15899 | + |
15900 | + file = kio->ki_filp; | |
15901 | + kio->ki_filp = h_file; | |
15902 | + if (iter) { | |
2cbb1c4b | 15903 | + lockdep_off(); |
076b876e AM |
15904 | + err = iter(kio, iov_iter); |
15905 | + lockdep_on(); | |
4a4d8108 AM |
15906 | + } else |
15907 | + /* currently there is no such fs */ | |
15908 | + WARN_ON_ONCE(1); | |
076b876e | 15909 | + kio->ki_filp = file; |
1facf9fc | 15910 | + |
4f0767ce | 15911 | +out: |
dece6358 AM |
15912 | + return err; |
15913 | +} | |
1facf9fc | 15914 | + |
076b876e | 15915 | +static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
1facf9fc | 15916 | +{ |
4a4d8108 AM |
15917 | + ssize_t err; |
15918 | + struct file *file, *h_file; | |
b912730e | 15919 | + struct inode *inode; |
dece6358 | 15920 | + struct super_block *sb; |
1facf9fc | 15921 | + |
4a4d8108 | 15922 | + file = kio->ki_filp; |
b912730e AM |
15923 | + inode = file_inode(file); |
15924 | + sb = inode->i_sb; | |
e49829fe | 15925 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 | 15926 | + |
521ced18 | 15927 | + h_file = au_read_pre(file, /*keep_fi*/1, /*lsc*/0); |
b912730e AM |
15928 | + err = PTR_ERR(h_file); |
15929 | + if (IS_ERR(h_file)) | |
15930 | + goto out; | |
9dbd164d | 15931 | + |
5afbbe0d AM |
15932 | + if (au_test_loopback_kthread()) { |
15933 | + au_warn_loopback(h_file->f_path.dentry->d_sb); | |
15934 | + if (file->f_mapping != h_file->f_mapping) { | |
15935 | + file->f_mapping = h_file->f_mapping; | |
15936 | + smp_mb(); /* unnecessary? */ | |
15937 | + } | |
15938 | + } | |
15939 | + fi_read_unlock(file); | |
15940 | + | |
076b876e | 15941 | + err = au_do_iter(h_file, MAY_READ, kio, iov_iter); |
4a4d8108 AM |
15942 | + /* todo: necessary? */ |
15943 | + /* file->f_ra = h_file->f_ra; */ | |
b912730e | 15944 | + au_read_post(inode, h_file); |
1facf9fc | 15945 | + |
4f0767ce | 15946 | +out: |
4a4d8108 | 15947 | + si_read_unlock(sb); |
1308ab2a | 15948 | + return err; |
15949 | +} | |
1facf9fc | 15950 | + |
076b876e | 15951 | +static ssize_t aufs_write_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
1308ab2a | 15952 | +{ |
4a4d8108 | 15953 | + ssize_t err; |
b912730e AM |
15954 | + struct au_write_pre wpre; |
15955 | + struct inode *inode; | |
4a4d8108 | 15956 | + struct file *file, *h_file; |
1308ab2a | 15957 | + |
4a4d8108 | 15958 | + file = kio->ki_filp; |
b912730e | 15959 | + inode = file_inode(file); |
e49829fe JR |
15960 | + au_mtx_and_read_lock(inode); |
15961 | + | |
521ced18 | 15962 | + wpre.lsc = 0; |
b912730e AM |
15963 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
15964 | + err = PTR_ERR(h_file); | |
15965 | + if (IS_ERR(h_file)) | |
9dbd164d | 15966 | + goto out; |
9dbd164d | 15967 | + |
076b876e | 15968 | + err = au_do_iter(h_file, MAY_WRITE, kio, iov_iter); |
b912730e | 15969 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 15970 | + |
4f0767ce | 15971 | +out: |
b912730e | 15972 | + si_read_unlock(inode->i_sb); |
febd17d6 | 15973 | + inode_unlock(inode); |
dece6358 | 15974 | + return err; |
1facf9fc | 15975 | +} |
15976 | + | |
4a4d8108 AM |
15977 | +static ssize_t aufs_splice_read(struct file *file, loff_t *ppos, |
15978 | + struct pipe_inode_info *pipe, size_t len, | |
15979 | + unsigned int flags) | |
1facf9fc | 15980 | +{ |
4a4d8108 AM |
15981 | + ssize_t err; |
15982 | + struct file *h_file; | |
b912730e | 15983 | + struct inode *inode; |
dece6358 | 15984 | + struct super_block *sb; |
1facf9fc | 15985 | + |
b912730e AM |
15986 | + inode = file_inode(file); |
15987 | + sb = inode->i_sb; | |
e49829fe | 15988 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 15989 | + |
521ced18 | 15990 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
15991 | + err = PTR_ERR(h_file); |
15992 | + if (IS_ERR(h_file)) | |
dece6358 | 15993 | + goto out; |
1facf9fc | 15994 | + |
4a4d8108 AM |
15995 | + err = vfsub_splice_to(h_file, ppos, pipe, len, flags); |
15996 | + /* todo: necessasry? */ | |
15997 | + /* file->f_ra = h_file->f_ra; */ | |
b912730e | 15998 | + au_read_post(inode, h_file); |
1facf9fc | 15999 | + |
4f0767ce | 16000 | +out: |
4a4d8108 | 16001 | + si_read_unlock(sb); |
dece6358 | 16002 | + return err; |
1facf9fc | 16003 | +} |
16004 | + | |
4a4d8108 AM |
16005 | +static ssize_t |
16006 | +aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos, | |
16007 | + size_t len, unsigned int flags) | |
1facf9fc | 16008 | +{ |
4a4d8108 | 16009 | + ssize_t err; |
b912730e AM |
16010 | + struct au_write_pre wpre; |
16011 | + struct inode *inode; | |
076b876e | 16012 | + struct file *h_file; |
1facf9fc | 16013 | + |
b912730e | 16014 | + inode = file_inode(file); |
e49829fe | 16015 | + au_mtx_and_read_lock(inode); |
9dbd164d | 16016 | + |
521ced18 | 16017 | + wpre.lsc = 0; |
b912730e AM |
16018 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
16019 | + err = PTR_ERR(h_file); | |
16020 | + if (IS_ERR(h_file)) | |
9dbd164d | 16021 | + goto out; |
9dbd164d | 16022 | + |
4a4d8108 | 16023 | + err = vfsub_splice_from(pipe, h_file, ppos, len, flags); |
b912730e | 16024 | + au_write_post(inode, h_file, &wpre, err); |
1facf9fc | 16025 | + |
4f0767ce | 16026 | +out: |
b912730e | 16027 | + si_read_unlock(inode->i_sb); |
febd17d6 | 16028 | + inode_unlock(inode); |
4a4d8108 AM |
16029 | + return err; |
16030 | +} | |
1facf9fc | 16031 | + |
38d290e6 JR |
16032 | +static long aufs_fallocate(struct file *file, int mode, loff_t offset, |
16033 | + loff_t len) | |
16034 | +{ | |
16035 | + long err; | |
b912730e | 16036 | + struct au_write_pre wpre; |
38d290e6 JR |
16037 | + struct inode *inode; |
16038 | + struct file *h_file; | |
16039 | + | |
b912730e | 16040 | + inode = file_inode(file); |
38d290e6 JR |
16041 | + au_mtx_and_read_lock(inode); |
16042 | + | |
521ced18 | 16043 | + wpre.lsc = 0; |
b912730e AM |
16044 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
16045 | + err = PTR_ERR(h_file); | |
16046 | + if (IS_ERR(h_file)) | |
38d290e6 | 16047 | + goto out; |
38d290e6 JR |
16048 | + |
16049 | + lockdep_off(); | |
03673fb0 | 16050 | + err = vfs_fallocate(h_file, mode, offset, len); |
38d290e6 | 16051 | + lockdep_on(); |
b912730e | 16052 | + au_write_post(inode, h_file, &wpre, /*written*/1); |
38d290e6 JR |
16053 | + |
16054 | +out: | |
b912730e | 16055 | + si_read_unlock(inode->i_sb); |
febd17d6 | 16056 | + inode_unlock(inode); |
38d290e6 JR |
16057 | + return err; |
16058 | +} | |
16059 | + | |
521ced18 JR |
16060 | +static ssize_t aufs_copy_file_range(struct file *src, loff_t src_pos, |
16061 | + struct file *dst, loff_t dst_pos, | |
16062 | + size_t len, unsigned int flags) | |
16063 | +{ | |
16064 | + ssize_t err; | |
16065 | + struct au_write_pre wpre; | |
16066 | + enum { SRC, DST }; | |
16067 | + struct { | |
16068 | + struct inode *inode; | |
16069 | + struct file *h_file; | |
16070 | + struct super_block *h_sb; | |
16071 | + } a[2]; | |
16072 | +#define a_src a[SRC] | |
16073 | +#define a_dst a[DST] | |
16074 | + | |
16075 | + err = -EINVAL; | |
16076 | + a_src.inode = file_inode(src); | |
16077 | + if (unlikely(!S_ISREG(a_src.inode->i_mode))) | |
16078 | + goto out; | |
16079 | + a_dst.inode = file_inode(dst); | |
16080 | + if (unlikely(!S_ISREG(a_dst.inode->i_mode))) | |
16081 | + goto out; | |
16082 | + | |
16083 | + au_mtx_and_read_lock(a_dst.inode); | |
16084 | + /* | |
16085 | + * in order to match the order in di_write_lock2_{child,parent}(), | |
16086 | + * use f_path.dentry for this comparision. | |
16087 | + */ | |
16088 | + if (src->f_path.dentry < dst->f_path.dentry) { | |
16089 | + a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_1); | |
16090 | + err = PTR_ERR(a_src.h_file); | |
16091 | + if (IS_ERR(a_src.h_file)) | |
16092 | + goto out_si; | |
16093 | + | |
16094 | + wpre.lsc = AuLsc_FI_2; | |
16095 | + a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); | |
16096 | + err = PTR_ERR(a_dst.h_file); | |
16097 | + if (IS_ERR(a_dst.h_file)) { | |
16098 | + au_read_post(a_src.inode, a_src.h_file); | |
16099 | + goto out_si; | |
16100 | + } | |
16101 | + } else { | |
16102 | + wpre.lsc = AuLsc_FI_1; | |
16103 | + a_dst.h_file = au_write_pre(dst, /*do_ready*/1, &wpre); | |
16104 | + err = PTR_ERR(a_dst.h_file); | |
16105 | + if (IS_ERR(a_dst.h_file)) | |
16106 | + goto out_si; | |
16107 | + | |
16108 | + a_src.h_file = au_read_pre(src, /*keep_fi*/1, AuLsc_FI_2); | |
16109 | + err = PTR_ERR(a_src.h_file); | |
16110 | + if (IS_ERR(a_src.h_file)) { | |
16111 | + au_write_post(a_dst.inode, a_dst.h_file, &wpre, | |
16112 | + /*written*/0); | |
16113 | + goto out_si; | |
16114 | + } | |
16115 | + } | |
16116 | + | |
16117 | + err = -EXDEV; | |
16118 | + a_src.h_sb = file_inode(a_src.h_file)->i_sb; | |
16119 | + a_dst.h_sb = file_inode(a_dst.h_file)->i_sb; | |
16120 | + if (unlikely(a_src.h_sb != a_dst.h_sb)) { | |
16121 | + AuDbgFile(src); | |
16122 | + AuDbgFile(dst); | |
16123 | + goto out_file; | |
16124 | + } | |
16125 | + | |
16126 | + err = vfsub_copy_file_range(a_src.h_file, src_pos, a_dst.h_file, | |
16127 | + dst_pos, len, flags); | |
16128 | + | |
16129 | +out_file: | |
16130 | + au_write_post(a_dst.inode, a_dst.h_file, &wpre, err); | |
16131 | + fi_read_unlock(src); | |
16132 | + au_read_post(a_src.inode, a_src.h_file); | |
16133 | +out_si: | |
16134 | + si_read_unlock(a_dst.inode->i_sb); | |
16135 | + inode_unlock(a_dst.inode); | |
16136 | +out: | |
16137 | + return err; | |
16138 | +#undef a_src | |
16139 | +#undef a_dst | |
16140 | +} | |
16141 | + | |
4a4d8108 AM |
16142 | +/* ---------------------------------------------------------------------- */ |
16143 | + | |
9dbd164d AM |
16144 | +/* |
16145 | + * The locking order around current->mmap_sem. | |
16146 | + * - in most and regular cases | |
16147 | + * file I/O syscall -- aufs_read() or something | |
16148 | + * -- si_rwsem for read -- mmap_sem | |
16149 | + * (Note that [fdi]i_rwsem are released before mmap_sem). | |
16150 | + * - in mmap case | |
16151 | + * mmap(2) -- mmap_sem -- aufs_mmap() -- si_rwsem for read -- [fdi]i_rwsem | |
16152 | + * This AB-BA order is definitly bad, but is not a problem since "si_rwsem for | |
16153 | + * read" allows muliple processes to acquire it and [fdi]i_rwsem are not held in | |
16154 | + * file I/O. Aufs needs to stop lockdep in aufs_mmap() though. | |
16155 | + * It means that when aufs acquires si_rwsem for write, the process should never | |
16156 | + * acquire mmap_sem. | |
16157 | + * | |
392086de | 16158 | + * Actually aufs_iterate() holds [fdi]i_rwsem before mmap_sem, but this is not a |
9dbd164d AM |
16159 | + * problem either since any directory is not able to be mmap-ed. |
16160 | + * The similar scenario is applied to aufs_readlink() too. | |
16161 | + */ | |
16162 | + | |
38d290e6 | 16163 | +#if 0 /* stop calling security_file_mmap() */ |
2dfbb274 AM |
16164 | +/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */ |
16165 | +#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b) | |
16166 | + | |
16167 | +static unsigned long au_arch_prot_conv(unsigned long flags) | |
16168 | +{ | |
16169 | + /* currently ppc64 only */ | |
16170 | +#ifdef CONFIG_PPC64 | |
16171 | + /* cf. linux/arch/powerpc/include/asm/mman.h */ | |
16172 | + AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO); | |
16173 | + return AuConv_VM_PROT(flags, SAO); | |
16174 | +#else | |
16175 | + AuDebugOn(arch_calc_vm_prot_bits(-1)); | |
16176 | + return 0; | |
16177 | +#endif | |
16178 | +} | |
16179 | + | |
16180 | +static unsigned long au_prot_conv(unsigned long flags) | |
16181 | +{ | |
16182 | + return AuConv_VM_PROT(flags, READ) | |
16183 | + | AuConv_VM_PROT(flags, WRITE) | |
16184 | + | AuConv_VM_PROT(flags, EXEC) | |
16185 | + | au_arch_prot_conv(flags); | |
16186 | +} | |
16187 | + | |
16188 | +/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */ | |
16189 | +#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b) | |
16190 | + | |
16191 | +static unsigned long au_flag_conv(unsigned long flags) | |
16192 | +{ | |
16193 | + return AuConv_VM_MAP(flags, GROWSDOWN) | |
16194 | + | AuConv_VM_MAP(flags, DENYWRITE) | |
2dfbb274 AM |
16195 | + | AuConv_VM_MAP(flags, LOCKED); |
16196 | +} | |
38d290e6 | 16197 | +#endif |
2dfbb274 | 16198 | + |
9dbd164d | 16199 | +static int aufs_mmap(struct file *file, struct vm_area_struct *vma) |
dece6358 | 16200 | +{ |
4a4d8108 | 16201 | + int err; |
4a4d8108 | 16202 | + const unsigned char wlock |
9dbd164d | 16203 | + = (file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED); |
4a4d8108 | 16204 | + struct super_block *sb; |
9dbd164d | 16205 | + struct file *h_file; |
b912730e | 16206 | + struct inode *inode; |
9dbd164d AM |
16207 | + |
16208 | + AuDbgVmRegion(file, vma); | |
1308ab2a | 16209 | + |
b912730e AM |
16210 | + inode = file_inode(file); |
16211 | + sb = inode->i_sb; | |
9dbd164d | 16212 | + lockdep_off(); |
e49829fe | 16213 | + si_read_lock(sb, AuLock_NOPLMW); |
4a4d8108 | 16214 | + |
b912730e | 16215 | + h_file = au_write_pre(file, wlock, /*wpre*/NULL); |
9dbd164d | 16216 | + lockdep_on(); |
b912730e AM |
16217 | + err = PTR_ERR(h_file); |
16218 | + if (IS_ERR(h_file)) | |
16219 | + goto out; | |
1308ab2a | 16220 | + |
b912730e AM |
16221 | + err = 0; |
16222 | + au_set_mmapped(file); | |
9dbd164d | 16223 | + au_vm_file_reset(vma, h_file); |
38d290e6 JR |
16224 | + /* |
16225 | + * we cannot call security_mmap_file() here since it may acquire | |
16226 | + * mmap_sem or i_mutex. | |
16227 | + * | |
16228 | + * err = security_mmap_file(h_file, au_prot_conv(vma->vm_flags), | |
16229 | + * au_flag_conv(vma->vm_flags)); | |
16230 | + */ | |
9dbd164d | 16231 | + if (!err) |
521ced18 | 16232 | + err = call_mmap(h_file, vma); |
b912730e AM |
16233 | + if (!err) { |
16234 | + au_vm_prfile_set(vma, file); | |
16235 | + fsstack_copy_attr_atime(inode, file_inode(h_file)); | |
16236 | + goto out_fput; /* success */ | |
16237 | + } | |
2cbb1c4b JR |
16238 | + au_unset_mmapped(file); |
16239 | + au_vm_file_reset(vma, file); | |
b912730e | 16240 | + |
2cbb1c4b | 16241 | +out_fput: |
9dbd164d | 16242 | + lockdep_off(); |
b912730e AM |
16243 | + ii_write_unlock(inode); |
16244 | + lockdep_on(); | |
16245 | + fput(h_file); | |
4f0767ce | 16246 | +out: |
b912730e | 16247 | + lockdep_off(); |
9dbd164d AM |
16248 | + si_read_unlock(sb); |
16249 | + lockdep_on(); | |
16250 | + AuTraceErr(err); | |
4a4d8108 AM |
16251 | + return err; |
16252 | +} | |
16253 | + | |
16254 | +/* ---------------------------------------------------------------------- */ | |
16255 | + | |
1e00d052 AM |
16256 | +static int aufs_fsync_nondir(struct file *file, loff_t start, loff_t end, |
16257 | + int datasync) | |
4a4d8108 AM |
16258 | +{ |
16259 | + int err; | |
b912730e | 16260 | + struct au_write_pre wpre; |
4a4d8108 AM |
16261 | + struct inode *inode; |
16262 | + struct file *h_file; | |
4a4d8108 AM |
16263 | + |
16264 | + err = 0; /* -EBADF; */ /* posix? */ | |
16265 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
b912730e | 16266 | + goto out; |
4a4d8108 | 16267 | + |
b912730e AM |
16268 | + inode = file_inode(file); |
16269 | + au_mtx_and_read_lock(inode); | |
16270 | + | |
521ced18 | 16271 | + wpre.lsc = 0; |
b912730e AM |
16272 | + h_file = au_write_pre(file, /*do_ready*/1, &wpre); |
16273 | + err = PTR_ERR(h_file); | |
16274 | + if (IS_ERR(h_file)) | |
4a4d8108 | 16275 | + goto out_unlock; |
4a4d8108 | 16276 | + |
53392da6 | 16277 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
b912730e | 16278 | + au_write_post(inode, h_file, &wpre, /*written*/0); |
4a4d8108 | 16279 | + |
4f0767ce | 16280 | +out_unlock: |
b912730e | 16281 | + si_read_unlock(inode->i_sb); |
febd17d6 | 16282 | + inode_unlock(inode); |
b912730e | 16283 | +out: |
4a4d8108 | 16284 | + return err; |
dece6358 AM |
16285 | +} |
16286 | + | |
4a4d8108 | 16287 | +static int aufs_fasync(int fd, struct file *file, int flag) |
dece6358 | 16288 | +{ |
4a4d8108 AM |
16289 | + int err; |
16290 | + struct file *h_file; | |
4a4d8108 | 16291 | + struct super_block *sb; |
1308ab2a | 16292 | + |
b912730e | 16293 | + sb = file->f_path.dentry->d_sb; |
e49829fe | 16294 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 16295 | + |
521ced18 | 16296 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
b912730e AM |
16297 | + err = PTR_ERR(h_file); |
16298 | + if (IS_ERR(h_file)) | |
4a4d8108 AM |
16299 | + goto out; |
16300 | + | |
523b37e3 | 16301 | + if (h_file->f_op->fasync) |
4a4d8108 | 16302 | + err = h_file->f_op->fasync(fd, h_file, flag); |
b912730e | 16303 | + fput(h_file); /* instead of au_read_post() */ |
1308ab2a | 16304 | + |
4f0767ce | 16305 | +out: |
4a4d8108 | 16306 | + si_read_unlock(sb); |
1308ab2a | 16307 | + return err; |
dece6358 | 16308 | +} |
4a4d8108 | 16309 | + |
febd17d6 JR |
16310 | +static int aufs_setfl(struct file *file, unsigned long arg) |
16311 | +{ | |
16312 | + int err; | |
16313 | + struct file *h_file; | |
16314 | + struct super_block *sb; | |
16315 | + | |
16316 | + sb = file->f_path.dentry->d_sb; | |
16317 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); | |
16318 | + | |
521ced18 | 16319 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
febd17d6 JR |
16320 | + err = PTR_ERR(h_file); |
16321 | + if (IS_ERR(h_file)) | |
16322 | + goto out; | |
16323 | + | |
1c60b727 AM |
16324 | + /* stop calling h_file->fasync */ |
16325 | + arg |= vfsub_file_flags(file) & FASYNC; | |
febd17d6 JR |
16326 | + err = setfl(/*unused fd*/-1, h_file, arg); |
16327 | + fput(h_file); /* instead of au_read_post() */ | |
16328 | + | |
16329 | +out: | |
16330 | + si_read_unlock(sb); | |
16331 | + return err; | |
16332 | +} | |
16333 | + | |
4a4d8108 AM |
16334 | +/* ---------------------------------------------------------------------- */ |
16335 | + | |
16336 | +/* no one supports this operation, currently */ | |
16337 | +#if 0 | |
16338 | +static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset, | |
2000de60 | 16339 | + size_t len, loff_t *pos, int more) |
4a4d8108 AM |
16340 | +{ |
16341 | +} | |
16342 | +#endif | |
16343 | + | |
16344 | +/* ---------------------------------------------------------------------- */ | |
16345 | + | |
16346 | +const struct file_operations aufs_file_fop = { | |
16347 | + .owner = THIS_MODULE, | |
2cbb1c4b | 16348 | + |
027c5e7a | 16349 | + .llseek = default_llseek, |
4a4d8108 AM |
16350 | + |
16351 | + .read = aufs_read, | |
16352 | + .write = aufs_write, | |
076b876e AM |
16353 | + .read_iter = aufs_read_iter, |
16354 | + .write_iter = aufs_write_iter, | |
16355 | + | |
4a4d8108 AM |
16356 | +#ifdef CONFIG_AUFS_POLL |
16357 | + .poll = aufs_poll, | |
16358 | +#endif | |
16359 | + .unlocked_ioctl = aufs_ioctl_nondir, | |
b752ccd1 | 16360 | +#ifdef CONFIG_COMPAT |
c2b27bf2 | 16361 | + .compat_ioctl = aufs_compat_ioctl_nondir, |
b752ccd1 | 16362 | +#endif |
4a4d8108 AM |
16363 | + .mmap = aufs_mmap, |
16364 | + .open = aufs_open_nondir, | |
16365 | + .flush = aufs_flush_nondir, | |
16366 | + .release = aufs_release_nondir, | |
16367 | + .fsync = aufs_fsync_nondir, | |
4a4d8108 AM |
16368 | + .fasync = aufs_fasync, |
16369 | + /* .sendpage = aufs_sendpage, */ | |
febd17d6 | 16370 | + .setfl = aufs_setfl, |
4a4d8108 AM |
16371 | + .splice_write = aufs_splice_write, |
16372 | + .splice_read = aufs_splice_read, | |
16373 | +#if 0 | |
16374 | + .aio_splice_write = aufs_aio_splice_write, | |
38d290e6 | 16375 | + .aio_splice_read = aufs_aio_splice_read, |
4a4d8108 | 16376 | +#endif |
521ced18 JR |
16377 | + .fallocate = aufs_fallocate, |
16378 | + .copy_file_range = aufs_copy_file_range | |
4a4d8108 | 16379 | +}; |
7f207e10 AM |
16380 | diff -urN /usr/share/empty/fs/aufs/fstype.h linux/fs/aufs/fstype.h |
16381 | --- /usr/share/empty/fs/aufs/fstype.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 16382 | +++ linux/fs/aufs/fstype.h 2018-08-12 23:43:05.456791299 +0200 |
062440b3 AM |
16383 | @@ -0,0 +1,401 @@ |
16384 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
4a4d8108 | 16385 | +/* |
b00004a5 | 16386 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
16387 | + * |
16388 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16389 | + * it under the terms of the GNU General Public License as published by | |
16390 | + * the Free Software Foundation; either version 2 of the License, or | |
16391 | + * (at your option) any later version. | |
16392 | + * | |
16393 | + * This program is distributed in the hope that it will be useful, | |
16394 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16395 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16396 | + * GNU General Public License for more details. | |
16397 | + * | |
16398 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 16399 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
16400 | + */ |
16401 | + | |
16402 | +/* | |
16403 | + * judging filesystem type | |
16404 | + */ | |
16405 | + | |
16406 | +#ifndef __AUFS_FSTYPE_H__ | |
16407 | +#define __AUFS_FSTYPE_H__ | |
16408 | + | |
16409 | +#ifdef __KERNEL__ | |
16410 | + | |
16411 | +#include <linux/fs.h> | |
16412 | +#include <linux/magic.h> | |
b912730e | 16413 | +#include <linux/nfs_fs.h> |
b95c5147 | 16414 | +#include <linux/romfs_fs.h> |
4a4d8108 AM |
16415 | + |
16416 | +static inline int au_test_aufs(struct super_block *sb) | |
16417 | +{ | |
16418 | + return sb->s_magic == AUFS_SUPER_MAGIC; | |
16419 | +} | |
16420 | + | |
16421 | +static inline const char *au_sbtype(struct super_block *sb) | |
16422 | +{ | |
16423 | + return sb->s_type->name; | |
16424 | +} | |
1308ab2a | 16425 | + |
16426 | +static inline int au_test_iso9660(struct super_block *sb __maybe_unused) | |
16427 | +{ | |
f0c0a007 | 16428 | +#if IS_ENABLED(CONFIG_ISO9660_FS) |
2000de60 | 16429 | + return sb->s_magic == ISOFS_SUPER_MAGIC; |
dece6358 AM |
16430 | +#else |
16431 | + return 0; | |
16432 | +#endif | |
16433 | +} | |
16434 | + | |
1308ab2a | 16435 | +static inline int au_test_romfs(struct super_block *sb __maybe_unused) |
dece6358 | 16436 | +{ |
f0c0a007 | 16437 | +#if IS_ENABLED(CONFIG_ROMFS_FS) |
2000de60 | 16438 | + return sb->s_magic == ROMFS_MAGIC; |
dece6358 AM |
16439 | +#else |
16440 | + return 0; | |
16441 | +#endif | |
16442 | +} | |
16443 | + | |
1308ab2a | 16444 | +static inline int au_test_cramfs(struct super_block *sb __maybe_unused) |
dece6358 | 16445 | +{ |
f0c0a007 | 16446 | +#if IS_ENABLED(CONFIG_CRAMFS) |
1308ab2a | 16447 | + return sb->s_magic == CRAMFS_MAGIC; |
16448 | +#endif | |
16449 | + return 0; | |
16450 | +} | |
16451 | + | |
16452 | +static inline int au_test_nfs(struct super_block *sb __maybe_unused) | |
16453 | +{ | |
f0c0a007 | 16454 | +#if IS_ENABLED(CONFIG_NFS_FS) |
1308ab2a | 16455 | + return sb->s_magic == NFS_SUPER_MAGIC; |
dece6358 AM |
16456 | +#else |
16457 | + return 0; | |
16458 | +#endif | |
16459 | +} | |
16460 | + | |
1308ab2a | 16461 | +static inline int au_test_fuse(struct super_block *sb __maybe_unused) |
dece6358 | 16462 | +{ |
f0c0a007 | 16463 | +#if IS_ENABLED(CONFIG_FUSE_FS) |
1308ab2a | 16464 | + return sb->s_magic == FUSE_SUPER_MAGIC; |
dece6358 AM |
16465 | +#else |
16466 | + return 0; | |
16467 | +#endif | |
16468 | +} | |
16469 | + | |
1308ab2a | 16470 | +static inline int au_test_xfs(struct super_block *sb __maybe_unused) |
dece6358 | 16471 | +{ |
f0c0a007 | 16472 | +#if IS_ENABLED(CONFIG_XFS_FS) |
1308ab2a | 16473 | + return sb->s_magic == XFS_SB_MAGIC; |
dece6358 AM |
16474 | +#else |
16475 | + return 0; | |
16476 | +#endif | |
16477 | +} | |
16478 | + | |
1308ab2a | 16479 | +static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) |
dece6358 | 16480 | +{ |
1308ab2a | 16481 | +#ifdef CONFIG_TMPFS |
16482 | + return sb->s_magic == TMPFS_MAGIC; | |
16483 | +#else | |
16484 | + return 0; | |
dece6358 | 16485 | +#endif |
dece6358 AM |
16486 | +} |
16487 | + | |
1308ab2a | 16488 | +static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) |
1facf9fc | 16489 | +{ |
f0c0a007 | 16490 | +#if IS_ENABLED(CONFIG_ECRYPT_FS) |
1308ab2a | 16491 | + return !strcmp(au_sbtype(sb), "ecryptfs"); |
16492 | +#else | |
16493 | + return 0; | |
16494 | +#endif | |
1facf9fc | 16495 | +} |
16496 | + | |
1308ab2a | 16497 | +static inline int au_test_ramfs(struct super_block *sb) |
16498 | +{ | |
16499 | + return sb->s_magic == RAMFS_MAGIC; | |
16500 | +} | |
16501 | + | |
16502 | +static inline int au_test_ubifs(struct super_block *sb __maybe_unused) | |
16503 | +{ | |
f0c0a007 | 16504 | +#if IS_ENABLED(CONFIG_UBIFS_FS) |
1308ab2a | 16505 | + return sb->s_magic == UBIFS_SUPER_MAGIC; |
16506 | +#else | |
16507 | + return 0; | |
16508 | +#endif | |
16509 | +} | |
16510 | + | |
16511 | +static inline int au_test_procfs(struct super_block *sb __maybe_unused) | |
16512 | +{ | |
16513 | +#ifdef CONFIG_PROC_FS | |
16514 | + return sb->s_magic == PROC_SUPER_MAGIC; | |
16515 | +#else | |
16516 | + return 0; | |
16517 | +#endif | |
16518 | +} | |
16519 | + | |
16520 | +static inline int au_test_sysfs(struct super_block *sb __maybe_unused) | |
16521 | +{ | |
16522 | +#ifdef CONFIG_SYSFS | |
16523 | + return sb->s_magic == SYSFS_MAGIC; | |
16524 | +#else | |
16525 | + return 0; | |
16526 | +#endif | |
16527 | +} | |
16528 | + | |
16529 | +static inline int au_test_configfs(struct super_block *sb __maybe_unused) | |
16530 | +{ | |
f0c0a007 | 16531 | +#if IS_ENABLED(CONFIG_CONFIGFS_FS) |
1308ab2a | 16532 | + return sb->s_magic == CONFIGFS_MAGIC; |
16533 | +#else | |
16534 | + return 0; | |
16535 | +#endif | |
16536 | +} | |
16537 | + | |
16538 | +static inline int au_test_minix(struct super_block *sb __maybe_unused) | |
16539 | +{ | |
f0c0a007 | 16540 | +#if IS_ENABLED(CONFIG_MINIX_FS) |
1308ab2a | 16541 | + return sb->s_magic == MINIX3_SUPER_MAGIC |
16542 | + || sb->s_magic == MINIX2_SUPER_MAGIC | |
16543 | + || sb->s_magic == MINIX2_SUPER_MAGIC2 | |
16544 | + || sb->s_magic == MINIX_SUPER_MAGIC | |
16545 | + || sb->s_magic == MINIX_SUPER_MAGIC2; | |
16546 | +#else | |
16547 | + return 0; | |
16548 | +#endif | |
16549 | +} | |
16550 | + | |
1308ab2a | 16551 | +static inline int au_test_fat(struct super_block *sb __maybe_unused) |
16552 | +{ | |
f0c0a007 | 16553 | +#if IS_ENABLED(CONFIG_FAT_FS) |
1308ab2a | 16554 | + return sb->s_magic == MSDOS_SUPER_MAGIC; |
16555 | +#else | |
16556 | + return 0; | |
16557 | +#endif | |
16558 | +} | |
16559 | + | |
16560 | +static inline int au_test_msdos(struct super_block *sb) | |
16561 | +{ | |
16562 | + return au_test_fat(sb); | |
16563 | +} | |
16564 | + | |
16565 | +static inline int au_test_vfat(struct super_block *sb) | |
16566 | +{ | |
16567 | + return au_test_fat(sb); | |
16568 | +} | |
16569 | + | |
16570 | +static inline int au_test_securityfs(struct super_block *sb __maybe_unused) | |
16571 | +{ | |
16572 | +#ifdef CONFIG_SECURITYFS | |
16573 | + return sb->s_magic == SECURITYFS_MAGIC; | |
16574 | +#else | |
16575 | + return 0; | |
16576 | +#endif | |
16577 | +} | |
16578 | + | |
16579 | +static inline int au_test_squashfs(struct super_block *sb __maybe_unused) | |
16580 | +{ | |
f0c0a007 | 16581 | +#if IS_ENABLED(CONFIG_SQUASHFS) |
1308ab2a | 16582 | + return sb->s_magic == SQUASHFS_MAGIC; |
16583 | +#else | |
16584 | + return 0; | |
16585 | +#endif | |
16586 | +} | |
16587 | + | |
16588 | +static inline int au_test_btrfs(struct super_block *sb __maybe_unused) | |
16589 | +{ | |
f0c0a007 | 16590 | +#if IS_ENABLED(CONFIG_BTRFS_FS) |
1308ab2a | 16591 | + return sb->s_magic == BTRFS_SUPER_MAGIC; |
16592 | +#else | |
16593 | + return 0; | |
16594 | +#endif | |
16595 | +} | |
16596 | + | |
16597 | +static inline int au_test_xenfs(struct super_block *sb __maybe_unused) | |
16598 | +{ | |
f0c0a007 | 16599 | +#if IS_ENABLED(CONFIG_XENFS) |
1308ab2a | 16600 | + return sb->s_magic == XENFS_SUPER_MAGIC; |
16601 | +#else | |
16602 | + return 0; | |
16603 | +#endif | |
16604 | +} | |
16605 | + | |
16606 | +static inline int au_test_debugfs(struct super_block *sb __maybe_unused) | |
16607 | +{ | |
16608 | +#ifdef CONFIG_DEBUG_FS | |
16609 | + return sb->s_magic == DEBUGFS_MAGIC; | |
16610 | +#else | |
16611 | + return 0; | |
16612 | +#endif | |
16613 | +} | |
16614 | + | |
16615 | +static inline int au_test_nilfs(struct super_block *sb __maybe_unused) | |
16616 | +{ | |
f0c0a007 | 16617 | +#if IS_ENABLED(CONFIG_NILFS) |
1308ab2a | 16618 | + return sb->s_magic == NILFS_SUPER_MAGIC; |
16619 | +#else | |
16620 | + return 0; | |
16621 | +#endif | |
16622 | +} | |
16623 | + | |
4a4d8108 AM |
16624 | +static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) |
16625 | +{ | |
f0c0a007 | 16626 | +#if IS_ENABLED(CONFIG_HFSPLUS_FS) |
4a4d8108 AM |
16627 | + return sb->s_magic == HFSPLUS_SUPER_MAGIC; |
16628 | +#else | |
16629 | + return 0; | |
16630 | +#endif | |
16631 | +} | |
16632 | + | |
1308ab2a | 16633 | +/* ---------------------------------------------------------------------- */ |
16634 | +/* | |
16635 | + * they can't be an aufs branch. | |
16636 | + */ | |
16637 | +static inline int au_test_fs_unsuppoted(struct super_block *sb) | |
16638 | +{ | |
16639 | + return | |
16640 | +#ifndef CONFIG_AUFS_BR_RAMFS | |
16641 | + au_test_ramfs(sb) || | |
16642 | +#endif | |
16643 | + au_test_procfs(sb) | |
16644 | + || au_test_sysfs(sb) | |
16645 | + || au_test_configfs(sb) | |
16646 | + || au_test_debugfs(sb) | |
16647 | + || au_test_securityfs(sb) | |
16648 | + || au_test_xenfs(sb) | |
16649 | + || au_test_ecryptfs(sb) | |
16650 | + /* || !strcmp(au_sbtype(sb), "unionfs") */ | |
16651 | + || au_test_aufs(sb); /* will be supported in next version */ | |
16652 | +} | |
16653 | + | |
1308ab2a | 16654 | +static inline int au_test_fs_remote(struct super_block *sb) |
16655 | +{ | |
16656 | + return !au_test_tmpfs(sb) | |
16657 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
16658 | + && !au_test_ramfs(sb) | |
16659 | +#endif | |
16660 | + && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); | |
16661 | +} | |
16662 | + | |
16663 | +/* ---------------------------------------------------------------------- */ | |
16664 | + | |
16665 | +/* | |
16666 | + * Note: these functions (below) are created after reading ->getattr() in all | |
16667 | + * filesystems under linux/fs. it means we have to do so in every update... | |
16668 | + */ | |
16669 | + | |
16670 | +/* | |
16671 | + * some filesystems require getattr to refresh the inode attributes before | |
16672 | + * referencing. | |
16673 | + * in most cases, we can rely on the inode attribute in NFS (or every remote fs) | |
16674 | + * and leave the work for d_revalidate() | |
16675 | + */ | |
16676 | +static inline int au_test_fs_refresh_iattr(struct super_block *sb) | |
16677 | +{ | |
16678 | + return au_test_nfs(sb) | |
16679 | + || au_test_fuse(sb) | |
1308ab2a | 16680 | + /* || au_test_btrfs(sb) */ /* untested */ |
1308ab2a | 16681 | + ; |
16682 | +} | |
16683 | + | |
16684 | +/* | |
16685 | + * filesystems which don't maintain i_size or i_blocks. | |
16686 | + */ | |
16687 | +static inline int au_test_fs_bad_iattr_size(struct super_block *sb) | |
16688 | +{ | |
16689 | + return au_test_xfs(sb) | |
4a4d8108 AM |
16690 | + || au_test_btrfs(sb) |
16691 | + || au_test_ubifs(sb) | |
16692 | + || au_test_hfsplus(sb) /* maintained, but incorrect */ | |
1308ab2a | 16693 | + /* || au_test_minix(sb) */ /* untested */ |
16694 | + ; | |
16695 | +} | |
16696 | + | |
16697 | +/* | |
16698 | + * filesystems which don't store the correct value in some of their inode | |
16699 | + * attributes. | |
16700 | + */ | |
16701 | +static inline int au_test_fs_bad_iattr(struct super_block *sb) | |
16702 | +{ | |
16703 | + return au_test_fs_bad_iattr_size(sb) | |
1308ab2a | 16704 | + || au_test_fat(sb) |
16705 | + || au_test_msdos(sb) | |
16706 | + || au_test_vfat(sb); | |
1facf9fc | 16707 | +} |
16708 | + | |
16709 | +/* they don't check i_nlink in link(2) */ | |
16710 | +static inline int au_test_fs_no_limit_nlink(struct super_block *sb) | |
16711 | +{ | |
16712 | + return au_test_tmpfs(sb) | |
16713 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
16714 | + || au_test_ramfs(sb) | |
16715 | +#endif | |
4a4d8108 | 16716 | + || au_test_ubifs(sb) |
4a4d8108 | 16717 | + || au_test_hfsplus(sb); |
1facf9fc | 16718 | +} |
16719 | + | |
16720 | +/* | |
16721 | + * filesystems which sets S_NOATIME and S_NOCMTIME. | |
16722 | + */ | |
16723 | +static inline int au_test_fs_notime(struct super_block *sb) | |
16724 | +{ | |
16725 | + return au_test_nfs(sb) | |
16726 | + || au_test_fuse(sb) | |
dece6358 | 16727 | + || au_test_ubifs(sb) |
1facf9fc | 16728 | + ; |
16729 | +} | |
16730 | + | |
1facf9fc | 16731 | +/* temporary support for i#1 in cramfs */ |
16732 | +static inline int au_test_fs_unique_ino(struct inode *inode) | |
16733 | +{ | |
16734 | + if (au_test_cramfs(inode->i_sb)) | |
16735 | + return inode->i_ino != 1; | |
16736 | + return 1; | |
16737 | +} | |
16738 | + | |
16739 | +/* ---------------------------------------------------------------------- */ | |
16740 | + | |
16741 | +/* | |
16742 | + * the filesystem where the xino files placed must support i/o after unlink and | |
16743 | + * maintain i_size and i_blocks. | |
16744 | + */ | |
16745 | +static inline int au_test_fs_bad_xino(struct super_block *sb) | |
16746 | +{ | |
16747 | + return au_test_fs_remote(sb) | |
16748 | + || au_test_fs_bad_iattr_size(sb) | |
1facf9fc | 16749 | + /* don't want unnecessary work for xino */ |
16750 | + || au_test_aufs(sb) | |
1308ab2a | 16751 | + || au_test_ecryptfs(sb) |
16752 | + || au_test_nilfs(sb); | |
1facf9fc | 16753 | +} |
16754 | + | |
16755 | +static inline int au_test_fs_trunc_xino(struct super_block *sb) | |
16756 | +{ | |
16757 | + return au_test_tmpfs(sb) | |
16758 | + || au_test_ramfs(sb); | |
16759 | +} | |
16760 | + | |
16761 | +/* | |
16762 | + * test if the @sb is real-readonly. | |
16763 | + */ | |
16764 | +static inline int au_test_fs_rr(struct super_block *sb) | |
16765 | +{ | |
16766 | + return au_test_squashfs(sb) | |
16767 | + || au_test_iso9660(sb) | |
16768 | + || au_test_cramfs(sb) | |
16769 | + || au_test_romfs(sb); | |
16770 | +} | |
16771 | + | |
b912730e AM |
16772 | +/* |
16773 | + * test if the @inode is nfs with 'noacl' option | |
2121bcd9 | 16774 | + * NFS always sets SB_POSIXACL regardless its mount option 'noacl.' |
b912730e AM |
16775 | + */ |
16776 | +static inline int au_test_nfs_noacl(struct inode *inode) | |
16777 | +{ | |
16778 | + return au_test_nfs(inode->i_sb) | |
16779 | + /* && IS_POSIXACL(inode) */ | |
16780 | + && !nfs_server_capable(inode, NFS_CAP_ACLS); | |
16781 | +} | |
16782 | + | |
1facf9fc | 16783 | +#endif /* __KERNEL__ */ |
16784 | +#endif /* __AUFS_FSTYPE_H__ */ | |
8b6a4947 AM |
16785 | diff -urN /usr/share/empty/fs/aufs/hbl.h linux/fs/aufs/hbl.h |
16786 | --- /usr/share/empty/fs/aufs/hbl.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 16787 | +++ linux/fs/aufs/hbl.h 2018-08-12 23:43:05.456791299 +0200 |
062440b3 AM |
16788 | @@ -0,0 +1,65 @@ |
16789 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
8b6a4947 | 16790 | +/* |
b00004a5 | 16791 | + * Copyright (C) 2017-2018 Junjiro R. Okajima |
8b6a4947 AM |
16792 | + * |
16793 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16794 | + * it under the terms of the GNU General Public License as published by | |
16795 | + * the Free Software Foundation; either version 2 of the License, or | |
16796 | + * (at your option) any later version. | |
16797 | + * | |
16798 | + * This program is distributed in the hope that it will be useful, | |
16799 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16800 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16801 | + * GNU General Public License for more details. | |
16802 | + * | |
16803 | + * You should have received a copy of the GNU General Public License | |
16804 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
16805 | + */ | |
16806 | + | |
16807 | +/* | |
16808 | + * helpers for hlist_bl.h | |
16809 | + */ | |
16810 | + | |
16811 | +#ifndef __AUFS_HBL_H__ | |
16812 | +#define __AUFS_HBL_H__ | |
16813 | + | |
16814 | +#ifdef __KERNEL__ | |
16815 | + | |
16816 | +#include <linux/list_bl.h> | |
16817 | + | |
16818 | +static inline void au_hbl_add(struct hlist_bl_node *node, | |
16819 | + struct hlist_bl_head *hbl) | |
16820 | +{ | |
16821 | + hlist_bl_lock(hbl); | |
16822 | + hlist_bl_add_head(node, hbl); | |
16823 | + hlist_bl_unlock(hbl); | |
16824 | +} | |
16825 | + | |
16826 | +static inline void au_hbl_del(struct hlist_bl_node *node, | |
16827 | + struct hlist_bl_head *hbl) | |
16828 | +{ | |
16829 | + hlist_bl_lock(hbl); | |
16830 | + hlist_bl_del(node); | |
16831 | + hlist_bl_unlock(hbl); | |
16832 | +} | |
16833 | + | |
16834 | +#define au_hbl_for_each(pos, head) \ | |
16835 | + for (pos = hlist_bl_first(head); \ | |
16836 | + pos; \ | |
16837 | + pos = pos->next) | |
16838 | + | |
16839 | +static inline unsigned long au_hbl_count(struct hlist_bl_head *hbl) | |
16840 | +{ | |
16841 | + unsigned long cnt; | |
16842 | + struct hlist_bl_node *pos; | |
16843 | + | |
16844 | + cnt = 0; | |
16845 | + hlist_bl_lock(hbl); | |
16846 | + au_hbl_for_each(pos, hbl) | |
16847 | + cnt++; | |
16848 | + hlist_bl_unlock(hbl); | |
16849 | + return cnt; | |
16850 | +} | |
16851 | + | |
16852 | +#endif /* __KERNEL__ */ | |
16853 | +#endif /* __AUFS_HBL_H__ */ | |
7f207e10 AM |
16854 | diff -urN /usr/share/empty/fs/aufs/hfsnotify.c linux/fs/aufs/hfsnotify.c |
16855 | --- /usr/share/empty/fs/aufs/hfsnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 16856 | +++ linux/fs/aufs/hfsnotify.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 16857 | @@ -0,0 +1,290 @@ |
cd7a4cd9 | 16858 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 16859 | +/* |
b00004a5 | 16860 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 16861 | + * |
16862 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16863 | + * it under the terms of the GNU General Public License as published by | |
16864 | + * the Free Software Foundation; either version 2 of the License, or | |
16865 | + * (at your option) any later version. | |
dece6358 AM |
16866 | + * |
16867 | + * This program is distributed in the hope that it will be useful, | |
16868 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16869 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16870 | + * GNU General Public License for more details. | |
16871 | + * | |
16872 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 16873 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 16874 | + */ |
16875 | + | |
16876 | +/* | |
4a4d8108 | 16877 | + * fsnotify for the lower directories |
1facf9fc | 16878 | + */ |
16879 | + | |
16880 | +#include "aufs.h" | |
16881 | + | |
4a4d8108 AM |
16882 | +/* FS_IN_IGNORED is unnecessary */ |
16883 | +static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE | |
16884 | + | FS_CREATE | FS_EVENT_ON_CHILD); | |
7f207e10 | 16885 | +static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq); |
7eafdf33 | 16886 | +static __cacheline_aligned_in_smp atomic64_t au_hfsn_ifree = ATOMIC64_INIT(0); |
1facf9fc | 16887 | + |
0c5527e5 | 16888 | +static void au_hfsn_free_mark(struct fsnotify_mark *mark) |
1facf9fc | 16889 | +{ |
0c5527e5 AM |
16890 | + struct au_hnotify *hn = container_of(mark, struct au_hnotify, |
16891 | + hn_mark); | |
5afbbe0d | 16892 | + /* AuDbg("here\n"); */ |
1c60b727 | 16893 | + au_cache_free_hnotify(hn); |
8b6a4947 | 16894 | + smp_mb__before_atomic(); /* for atomic64_dec */ |
1716fcea AM |
16895 | + if (atomic64_dec_and_test(&au_hfsn_ifree)) |
16896 | + wake_up(&au_hfsn_wq); | |
4a4d8108 | 16897 | +} |
1facf9fc | 16898 | + |
027c5e7a | 16899 | +static int au_hfsn_alloc(struct au_hinode *hinode) |
4a4d8108 | 16900 | +{ |
1716fcea | 16901 | + int err; |
027c5e7a AM |
16902 | + struct au_hnotify *hn; |
16903 | + struct super_block *sb; | |
16904 | + struct au_branch *br; | |
0c5527e5 | 16905 | + struct fsnotify_mark *mark; |
027c5e7a | 16906 | + aufs_bindex_t bindex; |
1facf9fc | 16907 | + |
027c5e7a AM |
16908 | + hn = hinode->hi_notify; |
16909 | + sb = hn->hn_aufs_inode->i_sb; | |
16910 | + bindex = au_br_index(sb, hinode->hi_id); | |
16911 | + br = au_sbr(sb, bindex); | |
1716fcea AM |
16912 | + AuDebugOn(!br->br_hfsn); |
16913 | + | |
0c5527e5 | 16914 | + mark = &hn->hn_mark; |
ffa93bbd | 16915 | + fsnotify_init_mark(mark, br->br_hfsn->hfsn_group); |
0c5527e5 | 16916 | + mark->mask = AuHfsnMask; |
7f207e10 AM |
16917 | + /* |
16918 | + * by udba rename or rmdir, aufs assign a new inode to the known | |
16919 | + * h_inode, so specify 1 to allow dups. | |
16920 | + */ | |
c1595e42 | 16921 | + lockdep_off(); |
ffa93bbd AM |
16922 | + err = fsnotify_add_mark(mark, hinode->hi_inode, /*mnt*/NULL, |
16923 | + /*allow_dups*/1); | |
c1595e42 | 16924 | + lockdep_on(); |
1716fcea AM |
16925 | + |
16926 | + return err; | |
1facf9fc | 16927 | +} |
16928 | + | |
7eafdf33 | 16929 | +static int au_hfsn_free(struct au_hinode *hinode, struct au_hnotify *hn) |
1facf9fc | 16930 | +{ |
0c5527e5 | 16931 | + struct fsnotify_mark *mark; |
7eafdf33 | 16932 | + unsigned long long ull; |
1716fcea | 16933 | + struct fsnotify_group *group; |
7eafdf33 AM |
16934 | + |
16935 | + ull = atomic64_inc_return(&au_hfsn_ifree); | |
16936 | + BUG_ON(!ull); | |
953406b4 | 16937 | + |
0c5527e5 | 16938 | + mark = &hn->hn_mark; |
1716fcea AM |
16939 | + spin_lock(&mark->lock); |
16940 | + group = mark->group; | |
16941 | + fsnotify_get_group(group); | |
16942 | + spin_unlock(&mark->lock); | |
c1595e42 | 16943 | + lockdep_off(); |
1716fcea | 16944 | + fsnotify_destroy_mark(mark, group); |
5afbbe0d | 16945 | + fsnotify_put_mark(mark); |
1716fcea | 16946 | + fsnotify_put_group(group); |
c1595e42 | 16947 | + lockdep_on(); |
7f207e10 | 16948 | + |
7eafdf33 AM |
16949 | + /* free hn by myself */ |
16950 | + return 0; | |
1facf9fc | 16951 | +} |
16952 | + | |
16953 | +/* ---------------------------------------------------------------------- */ | |
16954 | + | |
4a4d8108 | 16955 | +static void au_hfsn_ctl(struct au_hinode *hinode, int do_set) |
1facf9fc | 16956 | +{ |
0c5527e5 | 16957 | + struct fsnotify_mark *mark; |
1facf9fc | 16958 | + |
0c5527e5 AM |
16959 | + mark = &hinode->hi_notify->hn_mark; |
16960 | + spin_lock(&mark->lock); | |
1facf9fc | 16961 | + if (do_set) { |
0c5527e5 AM |
16962 | + AuDebugOn(mark->mask & AuHfsnMask); |
16963 | + mark->mask |= AuHfsnMask; | |
1facf9fc | 16964 | + } else { |
0c5527e5 AM |
16965 | + AuDebugOn(!(mark->mask & AuHfsnMask)); |
16966 | + mark->mask &= ~AuHfsnMask; | |
1facf9fc | 16967 | + } |
0c5527e5 | 16968 | + spin_unlock(&mark->lock); |
4a4d8108 | 16969 | + /* fsnotify_recalc_inode_mask(hinode->hi_inode); */ |
1facf9fc | 16970 | +} |
16971 | + | |
4a4d8108 | 16972 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 16973 | + |
4a4d8108 AM |
16974 | +/* #define AuDbgHnotify */ |
16975 | +#ifdef AuDbgHnotify | |
16976 | +static char *au_hfsn_name(u32 mask) | |
16977 | +{ | |
16978 | +#ifdef CONFIG_AUFS_DEBUG | |
c06a8ce3 AM |
16979 | +#define test_ret(flag) \ |
16980 | + do { \ | |
16981 | + if (mask & flag) \ | |
16982 | + return #flag; \ | |
16983 | + } while (0) | |
4a4d8108 AM |
16984 | + test_ret(FS_ACCESS); |
16985 | + test_ret(FS_MODIFY); | |
16986 | + test_ret(FS_ATTRIB); | |
16987 | + test_ret(FS_CLOSE_WRITE); | |
16988 | + test_ret(FS_CLOSE_NOWRITE); | |
16989 | + test_ret(FS_OPEN); | |
16990 | + test_ret(FS_MOVED_FROM); | |
16991 | + test_ret(FS_MOVED_TO); | |
16992 | + test_ret(FS_CREATE); | |
16993 | + test_ret(FS_DELETE); | |
16994 | + test_ret(FS_DELETE_SELF); | |
16995 | + test_ret(FS_MOVE_SELF); | |
16996 | + test_ret(FS_UNMOUNT); | |
16997 | + test_ret(FS_Q_OVERFLOW); | |
16998 | + test_ret(FS_IN_IGNORED); | |
b912730e | 16999 | + test_ret(FS_ISDIR); |
4a4d8108 AM |
17000 | + test_ret(FS_IN_ONESHOT); |
17001 | + test_ret(FS_EVENT_ON_CHILD); | |
17002 | + return ""; | |
17003 | +#undef test_ret | |
17004 | +#else | |
17005 | + return "??"; | |
17006 | +#endif | |
1facf9fc | 17007 | +} |
4a4d8108 | 17008 | +#endif |
1facf9fc | 17009 | + |
17010 | +/* ---------------------------------------------------------------------- */ | |
17011 | + | |
1716fcea AM |
17012 | +static void au_hfsn_free_group(struct fsnotify_group *group) |
17013 | +{ | |
17014 | + struct au_br_hfsnotify *hfsn = group->private; | |
17015 | + | |
5afbbe0d | 17016 | + /* AuDbg("here\n"); */ |
1c60b727 | 17017 | + kfree(hfsn); |
1716fcea AM |
17018 | +} |
17019 | + | |
4a4d8108 | 17020 | +static int au_hfsn_handle_event(struct fsnotify_group *group, |
fb47a38f | 17021 | + struct inode *inode, |
a2654f78 | 17022 | + u32 mask, const void *data, int data_type, |
ffa93bbd AM |
17023 | + const unsigned char *file_name, u32 cookie, |
17024 | + struct fsnotify_iter_info *iter_info) | |
1facf9fc | 17025 | +{ |
17026 | + int err; | |
4a4d8108 AM |
17027 | + struct au_hnotify *hnotify; |
17028 | + struct inode *h_dir, *h_inode; | |
fb47a38f | 17029 | + struct qstr h_child_qstr = QSTR_INIT(file_name, strlen(file_name)); |
cd7a4cd9 | 17030 | + struct fsnotify_mark *inode_mark; |
4a4d8108 | 17031 | + |
fb47a38f | 17032 | + AuDebugOn(data_type != FSNOTIFY_EVENT_INODE); |
1facf9fc | 17033 | + |
17034 | + err = 0; | |
0c5527e5 | 17035 | + /* if FS_UNMOUNT happens, there must be another bug */ |
4a4d8108 | 17036 | + AuDebugOn(mask & FS_UNMOUNT); |
0c5527e5 | 17037 | + if (mask & (FS_IN_IGNORED | FS_UNMOUNT)) |
1facf9fc | 17038 | + goto out; |
1facf9fc | 17039 | + |
fb47a38f JR |
17040 | + h_dir = inode; |
17041 | + h_inode = NULL; | |
4a4d8108 | 17042 | +#ifdef AuDbgHnotify |
392086de | 17043 | + au_debug_on(); |
4a4d8108 AM |
17044 | + if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1 |
17045 | + || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) { | |
17046 | + AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n", | |
17047 | + h_dir->i_ino, mask, au_hfsn_name(mask), | |
17048 | + AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0); | |
17049 | + /* WARN_ON(1); */ | |
1facf9fc | 17050 | + } |
392086de | 17051 | + au_debug_off(); |
1facf9fc | 17052 | +#endif |
4a4d8108 | 17053 | + |
cd7a4cd9 | 17054 | + inode_mark = fsnotify_iter_inode_mark(iter_info); |
0c5527e5 AM |
17055 | + AuDebugOn(!inode_mark); |
17056 | + hnotify = container_of(inode_mark, struct au_hnotify, hn_mark); | |
17057 | + err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode); | |
1facf9fc | 17058 | + |
4a4d8108 AM |
17059 | +out: |
17060 | + return err; | |
17061 | +} | |
1facf9fc | 17062 | + |
4a4d8108 | 17063 | +static struct fsnotify_ops au_hfsn_ops = { |
1716fcea | 17064 | + .handle_event = au_hfsn_handle_event, |
ffa93bbd AM |
17065 | + .free_group_priv = au_hfsn_free_group, |
17066 | + .free_mark = au_hfsn_free_mark | |
4a4d8108 AM |
17067 | +}; |
17068 | + | |
17069 | +/* ---------------------------------------------------------------------- */ | |
17070 | + | |
027c5e7a AM |
17071 | +static void au_hfsn_fin_br(struct au_branch *br) |
17072 | +{ | |
1716fcea | 17073 | + struct au_br_hfsnotify *hfsn; |
027c5e7a | 17074 | + |
1716fcea | 17075 | + hfsn = br->br_hfsn; |
c1595e42 JR |
17076 | + if (hfsn) { |
17077 | + lockdep_off(); | |
1716fcea | 17078 | + fsnotify_put_group(hfsn->hfsn_group); |
c1595e42 JR |
17079 | + lockdep_on(); |
17080 | + } | |
027c5e7a AM |
17081 | +} |
17082 | + | |
1716fcea | 17083 | +static int au_hfsn_init_br(struct au_branch *br, int perm) |
4a4d8108 AM |
17084 | +{ |
17085 | + int err; | |
1716fcea AM |
17086 | + struct fsnotify_group *group; |
17087 | + struct au_br_hfsnotify *hfsn; | |
1facf9fc | 17088 | + |
4a4d8108 | 17089 | + err = 0; |
1716fcea AM |
17090 | + br->br_hfsn = NULL; |
17091 | + if (!au_br_hnotifyable(perm)) | |
027c5e7a | 17092 | + goto out; |
027c5e7a | 17093 | + |
1716fcea AM |
17094 | + err = -ENOMEM; |
17095 | + hfsn = kmalloc(sizeof(*hfsn), GFP_NOFS); | |
17096 | + if (unlikely(!hfsn)) | |
027c5e7a AM |
17097 | + goto out; |
17098 | + | |
1716fcea AM |
17099 | + err = 0; |
17100 | + group = fsnotify_alloc_group(&au_hfsn_ops); | |
17101 | + if (IS_ERR(group)) { | |
17102 | + err = PTR_ERR(group); | |
0c5527e5 | 17103 | + pr_err("fsnotify_alloc_group() failed, %d\n", err); |
1716fcea | 17104 | + goto out_hfsn; |
4a4d8108 | 17105 | + } |
1facf9fc | 17106 | + |
1716fcea AM |
17107 | + group->private = hfsn; |
17108 | + hfsn->hfsn_group = group; | |
17109 | + br->br_hfsn = hfsn; | |
17110 | + goto out; /* success */ | |
17111 | + | |
17112 | +out_hfsn: | |
1c60b727 | 17113 | + kfree(hfsn); |
027c5e7a | 17114 | +out: |
1716fcea AM |
17115 | + return err; |
17116 | +} | |
17117 | + | |
17118 | +static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
17119 | +{ | |
17120 | + int err; | |
17121 | + | |
17122 | + err = 0; | |
17123 | + if (!br->br_hfsn) | |
17124 | + err = au_hfsn_init_br(br, perm); | |
17125 | + | |
1facf9fc | 17126 | + return err; |
17127 | +} | |
17128 | + | |
7eafdf33 AM |
17129 | +/* ---------------------------------------------------------------------- */ |
17130 | + | |
17131 | +static void au_hfsn_fin(void) | |
17132 | +{ | |
17133 | + AuDbg("au_hfsn_ifree %lld\n", (long long)atomic64_read(&au_hfsn_ifree)); | |
17134 | + wait_event(au_hfsn_wq, !atomic64_read(&au_hfsn_ifree)); | |
17135 | +} | |
17136 | + | |
4a4d8108 AM |
17137 | +const struct au_hnotify_op au_hnotify_op = { |
17138 | + .ctl = au_hfsn_ctl, | |
17139 | + .alloc = au_hfsn_alloc, | |
17140 | + .free = au_hfsn_free, | |
1facf9fc | 17141 | + |
7eafdf33 AM |
17142 | + .fin = au_hfsn_fin, |
17143 | + | |
027c5e7a AM |
17144 | + .reset_br = au_hfsn_reset_br, |
17145 | + .fin_br = au_hfsn_fin_br, | |
17146 | + .init_br = au_hfsn_init_br | |
4a4d8108 | 17147 | +}; |
7f207e10 AM |
17148 | diff -urN /usr/share/empty/fs/aufs/hfsplus.c linux/fs/aufs/hfsplus.c |
17149 | --- /usr/share/empty/fs/aufs/hfsplus.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 17150 | +++ linux/fs/aufs/hfsplus.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 17151 | @@ -0,0 +1,57 @@ |
cd7a4cd9 | 17152 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 17153 | +/* |
b00004a5 | 17154 | + * Copyright (C) 2010-2018 Junjiro R. Okajima |
4a4d8108 AM |
17155 | + * |
17156 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17157 | + * it under the terms of the GNU General Public License as published by | |
17158 | + * the Free Software Foundation; either version 2 of the License, or | |
17159 | + * (at your option) any later version. | |
17160 | + * | |
17161 | + * This program is distributed in the hope that it will be useful, | |
17162 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17163 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17164 | + * GNU General Public License for more details. | |
17165 | + * | |
17166 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17167 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 17168 | + */ |
1facf9fc | 17169 | + |
4a4d8108 AM |
17170 | +/* |
17171 | + * special support for filesystems which aqucires an inode mutex | |
17172 | + * at final closing a file, eg, hfsplus. | |
17173 | + * | |
17174 | + * This trick is very simple and stupid, just to open the file before really | |
17175 | + * neceeary open to tell hfsplus that this is not the final closing. | |
17176 | + * The caller should call au_h_open_pre() after acquiring the inode mutex, | |
17177 | + * and au_h_open_post() after releasing it. | |
17178 | + */ | |
1facf9fc | 17179 | + |
4a4d8108 | 17180 | +#include "aufs.h" |
1facf9fc | 17181 | + |
392086de AM |
17182 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex, |
17183 | + int force_wr) | |
4a4d8108 AM |
17184 | +{ |
17185 | + struct file *h_file; | |
17186 | + struct dentry *h_dentry; | |
1facf9fc | 17187 | + |
4a4d8108 AM |
17188 | + h_dentry = au_h_dptr(dentry, bindex); |
17189 | + AuDebugOn(!h_dentry); | |
5527c038 | 17190 | + AuDebugOn(d_is_negative(h_dentry)); |
4a4d8108 AM |
17191 | + |
17192 | + h_file = NULL; | |
17193 | + if (au_test_hfsplus(h_dentry->d_sb) | |
7e9cd9fe | 17194 | + && d_is_reg(h_dentry)) |
4a4d8108 AM |
17195 | + h_file = au_h_open(dentry, bindex, |
17196 | + O_RDONLY | O_NOATIME | O_LARGEFILE, | |
392086de | 17197 | + /*file*/NULL, force_wr); |
4a4d8108 | 17198 | + return h_file; |
1facf9fc | 17199 | +} |
17200 | + | |
4a4d8108 AM |
17201 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
17202 | + struct file *h_file) | |
17203 | +{ | |
17204 | + if (h_file) { | |
17205 | + fput(h_file); | |
17206 | + au_sbr_put(dentry->d_sb, bindex); | |
17207 | + } | |
17208 | +} | |
7f207e10 AM |
17209 | diff -urN /usr/share/empty/fs/aufs/hnotify.c linux/fs/aufs/hnotify.c |
17210 | --- /usr/share/empty/fs/aufs/hnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 17211 | +++ linux/fs/aufs/hnotify.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 17212 | @@ -0,0 +1,720 @@ |
cd7a4cd9 | 17213 | +// SPDX-License-Identifier: GPL-2.0 |
e49829fe | 17214 | +/* |
b00004a5 | 17215 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
e49829fe JR |
17216 | + * |
17217 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17218 | + * it under the terms of the GNU General Public License as published by | |
17219 | + * the Free Software Foundation; either version 2 of the License, or | |
17220 | + * (at your option) any later version. | |
17221 | + * | |
17222 | + * This program is distributed in the hope that it will be useful, | |
17223 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17224 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17225 | + * GNU General Public License for more details. | |
17226 | + * | |
17227 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17228 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
e49829fe JR |
17229 | + */ |
17230 | + | |
17231 | +/* | |
7f207e10 | 17232 | + * abstraction to notify the direct changes on lower directories |
e49829fe JR |
17233 | + */ |
17234 | + | |
17235 | +#include "aufs.h" | |
17236 | + | |
027c5e7a | 17237 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode) |
e49829fe JR |
17238 | +{ |
17239 | + int err; | |
7f207e10 | 17240 | + struct au_hnotify *hn; |
1facf9fc | 17241 | + |
4a4d8108 AM |
17242 | + err = -ENOMEM; |
17243 | + hn = au_cache_alloc_hnotify(); | |
17244 | + if (hn) { | |
17245 | + hn->hn_aufs_inode = inode; | |
027c5e7a AM |
17246 | + hinode->hi_notify = hn; |
17247 | + err = au_hnotify_op.alloc(hinode); | |
17248 | + AuTraceErr(err); | |
17249 | + if (unlikely(err)) { | |
17250 | + hinode->hi_notify = NULL; | |
1c60b727 | 17251 | + au_cache_free_hnotify(hn); |
4a4d8108 AM |
17252 | + /* |
17253 | + * The upper dir was removed by udba, but the same named | |
17254 | + * dir left. In this case, aufs assignes a new inode | |
17255 | + * number and set the monitor again. | |
17256 | + * For the lower dir, the old monitnor is still left. | |
17257 | + */ | |
17258 | + if (err == -EEXIST) | |
17259 | + err = 0; | |
17260 | + } | |
1308ab2a | 17261 | + } |
1308ab2a | 17262 | + |
027c5e7a | 17263 | + AuTraceErr(err); |
1308ab2a | 17264 | + return err; |
dece6358 | 17265 | +} |
1facf9fc | 17266 | + |
4a4d8108 | 17267 | +void au_hn_free(struct au_hinode *hinode) |
dece6358 | 17268 | +{ |
4a4d8108 | 17269 | + struct au_hnotify *hn; |
1facf9fc | 17270 | + |
4a4d8108 AM |
17271 | + hn = hinode->hi_notify; |
17272 | + if (hn) { | |
4a4d8108 | 17273 | + hinode->hi_notify = NULL; |
7eafdf33 | 17274 | + if (au_hnotify_op.free(hinode, hn)) |
1c60b727 | 17275 | + au_cache_free_hnotify(hn); |
4a4d8108 AM |
17276 | + } |
17277 | +} | |
dece6358 | 17278 | + |
4a4d8108 | 17279 | +/* ---------------------------------------------------------------------- */ |
dece6358 | 17280 | + |
4a4d8108 AM |
17281 | +void au_hn_ctl(struct au_hinode *hinode, int do_set) |
17282 | +{ | |
17283 | + if (hinode->hi_notify) | |
17284 | + au_hnotify_op.ctl(hinode, do_set); | |
17285 | +} | |
17286 | + | |
17287 | +void au_hn_reset(struct inode *inode, unsigned int flags) | |
17288 | +{ | |
5afbbe0d | 17289 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
17290 | + struct inode *hi; |
17291 | + struct dentry *iwhdentry; | |
1facf9fc | 17292 | + |
5afbbe0d AM |
17293 | + bbot = au_ibbot(inode); |
17294 | + for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { | |
4a4d8108 AM |
17295 | + hi = au_h_iptr(inode, bindex); |
17296 | + if (!hi) | |
17297 | + continue; | |
1308ab2a | 17298 | + |
febd17d6 | 17299 | + /* inode_lock_nested(hi, AuLsc_I_CHILD); */ |
4a4d8108 AM |
17300 | + iwhdentry = au_hi_wh(inode, bindex); |
17301 | + if (iwhdentry) | |
17302 | + dget(iwhdentry); | |
17303 | + au_igrab(hi); | |
17304 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
17305 | + au_set_h_iptr(inode, bindex, au_igrab(hi), | |
17306 | + flags & ~AuHi_XINO); | |
17307 | + iput(hi); | |
17308 | + dput(iwhdentry); | |
febd17d6 | 17309 | + /* inode_unlock(hi); */ |
1facf9fc | 17310 | + } |
1facf9fc | 17311 | +} |
17312 | + | |
1308ab2a | 17313 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17314 | + |
4a4d8108 | 17315 | +static int hn_xino(struct inode *inode, struct inode *h_inode) |
1facf9fc | 17316 | +{ |
4a4d8108 | 17317 | + int err; |
5afbbe0d | 17318 | + aufs_bindex_t bindex, bbot, bfound, btop; |
4a4d8108 | 17319 | + struct inode *h_i; |
1facf9fc | 17320 | + |
4a4d8108 AM |
17321 | + err = 0; |
17322 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17323 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17324 | + goto out; |
17325 | + } | |
1facf9fc | 17326 | + |
4a4d8108 | 17327 | + bfound = -1; |
5afbbe0d AM |
17328 | + bbot = au_ibbot(inode); |
17329 | + btop = au_ibtop(inode); | |
4a4d8108 | 17330 | +#if 0 /* reserved for future use */ |
5afbbe0d | 17331 | + if (bindex == bbot) { |
4a4d8108 AM |
17332 | + /* keep this ino in rename case */ |
17333 | + goto out; | |
17334 | + } | |
17335 | +#endif | |
5afbbe0d | 17336 | + for (bindex = btop; bindex <= bbot; bindex++) |
4a4d8108 AM |
17337 | + if (au_h_iptr(inode, bindex) == h_inode) { |
17338 | + bfound = bindex; | |
17339 | + break; | |
17340 | + } | |
17341 | + if (bfound < 0) | |
1308ab2a | 17342 | + goto out; |
1facf9fc | 17343 | + |
5afbbe0d | 17344 | + for (bindex = btop; bindex <= bbot; bindex++) { |
4a4d8108 AM |
17345 | + h_i = au_h_iptr(inode, bindex); |
17346 | + if (!h_i) | |
17347 | + continue; | |
1facf9fc | 17348 | + |
4a4d8108 AM |
17349 | + err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0); |
17350 | + /* ignore this error */ | |
17351 | + /* bad action? */ | |
1facf9fc | 17352 | + } |
1facf9fc | 17353 | + |
4a4d8108 | 17354 | + /* children inode number will be broken */ |
1facf9fc | 17355 | + |
4f0767ce | 17356 | +out: |
4a4d8108 AM |
17357 | + AuTraceErr(err); |
17358 | + return err; | |
1facf9fc | 17359 | +} |
17360 | + | |
4a4d8108 | 17361 | +static int hn_gen_tree(struct dentry *dentry) |
1facf9fc | 17362 | +{ |
4a4d8108 AM |
17363 | + int err, i, j, ndentry; |
17364 | + struct au_dcsub_pages dpages; | |
17365 | + struct au_dpage *dpage; | |
17366 | + struct dentry **dentries; | |
1facf9fc | 17367 | + |
4a4d8108 AM |
17368 | + err = au_dpages_init(&dpages, GFP_NOFS); |
17369 | + if (unlikely(err)) | |
17370 | + goto out; | |
17371 | + err = au_dcsub_pages(&dpages, dentry, NULL, NULL); | |
17372 | + if (unlikely(err)) | |
17373 | + goto out_dpages; | |
1facf9fc | 17374 | + |
4a4d8108 AM |
17375 | + for (i = 0; i < dpages.ndpage; i++) { |
17376 | + dpage = dpages.dpages + i; | |
17377 | + dentries = dpage->dentries; | |
17378 | + ndentry = dpage->ndentry; | |
17379 | + for (j = 0; j < ndentry; j++) { | |
17380 | + struct dentry *d; | |
17381 | + | |
17382 | + d = dentries[j]; | |
17383 | + if (IS_ROOT(d)) | |
17384 | + continue; | |
17385 | + | |
4a4d8108 | 17386 | + au_digen_dec(d); |
5527c038 | 17387 | + if (d_really_is_positive(d)) |
4a4d8108 AM |
17388 | + /* todo: reset children xino? |
17389 | + cached children only? */ | |
5527c038 | 17390 | + au_iigen_dec(d_inode(d)); |
1308ab2a | 17391 | + } |
dece6358 | 17392 | + } |
1facf9fc | 17393 | + |
4f0767ce | 17394 | +out_dpages: |
4a4d8108 | 17395 | + au_dpages_free(&dpages); |
dece6358 | 17396 | + |
027c5e7a | 17397 | +#if 0 |
4a4d8108 AM |
17398 | + /* discard children */ |
17399 | + dentry_unhash(dentry); | |
17400 | + dput(dentry); | |
027c5e7a | 17401 | +#endif |
4f0767ce | 17402 | +out: |
dece6358 AM |
17403 | + return err; |
17404 | +} | |
17405 | + | |
1308ab2a | 17406 | +/* |
4a4d8108 | 17407 | + * return 0 if processed. |
1308ab2a | 17408 | + */ |
4a4d8108 AM |
17409 | +static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode, |
17410 | + const unsigned int isdir) | |
dece6358 | 17411 | +{ |
1308ab2a | 17412 | + int err; |
4a4d8108 AM |
17413 | + struct dentry *d; |
17414 | + struct qstr *dname; | |
1facf9fc | 17415 | + |
4a4d8108 AM |
17416 | + err = 1; |
17417 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17418 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17419 | + err = 0; |
17420 | + goto out; | |
17421 | + } | |
dece6358 | 17422 | + |
4a4d8108 AM |
17423 | + if (!isdir) { |
17424 | + AuDebugOn(!name); | |
17425 | + au_iigen_dec(inode); | |
027c5e7a | 17426 | + spin_lock(&inode->i_lock); |
c1595e42 | 17427 | + hlist_for_each_entry(d, &inode->i_dentry, d_u.d_alias) { |
027c5e7a | 17428 | + spin_lock(&d->d_lock); |
4a4d8108 AM |
17429 | + dname = &d->d_name; |
17430 | + if (dname->len != nlen | |
027c5e7a AM |
17431 | + && memcmp(dname->name, name, nlen)) { |
17432 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 17433 | + continue; |
027c5e7a | 17434 | + } |
4a4d8108 | 17435 | + err = 0; |
4a4d8108 AM |
17436 | + au_digen_dec(d); |
17437 | + spin_unlock(&d->d_lock); | |
17438 | + break; | |
1facf9fc | 17439 | + } |
027c5e7a | 17440 | + spin_unlock(&inode->i_lock); |
1308ab2a | 17441 | + } else { |
027c5e7a | 17442 | + au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR); |
c1595e42 | 17443 | + d = d_find_any_alias(inode); |
4a4d8108 AM |
17444 | + if (!d) { |
17445 | + au_iigen_dec(inode); | |
17446 | + goto out; | |
17447 | + } | |
1facf9fc | 17448 | + |
027c5e7a | 17449 | + spin_lock(&d->d_lock); |
4a4d8108 | 17450 | + dname = &d->d_name; |
027c5e7a AM |
17451 | + if (dname->len == nlen && !memcmp(dname->name, name, nlen)) { |
17452 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 17453 | + err = hn_gen_tree(d); |
027c5e7a AM |
17454 | + spin_lock(&d->d_lock); |
17455 | + } | |
17456 | + spin_unlock(&d->d_lock); | |
4a4d8108 AM |
17457 | + dput(d); |
17458 | + } | |
1facf9fc | 17459 | + |
4f0767ce | 17460 | +out: |
4a4d8108 | 17461 | + AuTraceErr(err); |
1308ab2a | 17462 | + return err; |
17463 | +} | |
dece6358 | 17464 | + |
4a4d8108 | 17465 | +static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir) |
1facf9fc | 17466 | +{ |
4a4d8108 | 17467 | + int err; |
1facf9fc | 17468 | + |
5527c038 | 17469 | + if (IS_ROOT(dentry)) { |
0c3ec466 | 17470 | + pr_warn("branch root dir was changed\n"); |
4a4d8108 AM |
17471 | + return 0; |
17472 | + } | |
1308ab2a | 17473 | + |
4a4d8108 AM |
17474 | + err = 0; |
17475 | + if (!isdir) { | |
4a4d8108 | 17476 | + au_digen_dec(dentry); |
5527c038 JR |
17477 | + if (d_really_is_positive(dentry)) |
17478 | + au_iigen_dec(d_inode(dentry)); | |
4a4d8108 | 17479 | + } else { |
027c5e7a | 17480 | + au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR); |
5527c038 | 17481 | + if (d_really_is_positive(dentry)) |
4a4d8108 AM |
17482 | + err = hn_gen_tree(dentry); |
17483 | + } | |
17484 | + | |
17485 | + AuTraceErr(err); | |
17486 | + return err; | |
1facf9fc | 17487 | +} |
17488 | + | |
4a4d8108 | 17489 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17490 | + |
4a4d8108 AM |
17491 | +/* hnotify job flags */ |
17492 | +#define AuHnJob_XINO0 1 | |
17493 | +#define AuHnJob_GEN (1 << 1) | |
17494 | +#define AuHnJob_DIRENT (1 << 2) | |
17495 | +#define AuHnJob_ISDIR (1 << 3) | |
17496 | +#define AuHnJob_TRYXINO0 (1 << 4) | |
17497 | +#define AuHnJob_MNTPNT (1 << 5) | |
17498 | +#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name) | |
7f207e10 AM |
17499 | +#define au_fset_hnjob(flags, name) \ |
17500 | + do { (flags) |= AuHnJob_##name; } while (0) | |
17501 | +#define au_fclr_hnjob(flags, name) \ | |
17502 | + do { (flags) &= ~AuHnJob_##name; } while (0) | |
1facf9fc | 17503 | + |
4a4d8108 AM |
17504 | +enum { |
17505 | + AuHn_CHILD, | |
17506 | + AuHn_PARENT, | |
17507 | + AuHnLast | |
17508 | +}; | |
1facf9fc | 17509 | + |
4a4d8108 AM |
17510 | +struct au_hnotify_args { |
17511 | + struct inode *h_dir, *dir, *h_child_inode; | |
17512 | + u32 mask; | |
17513 | + unsigned int flags[AuHnLast]; | |
17514 | + unsigned int h_child_nlen; | |
17515 | + char h_child_name[]; | |
17516 | +}; | |
1facf9fc | 17517 | + |
4a4d8108 AM |
17518 | +struct hn_job_args { |
17519 | + unsigned int flags; | |
17520 | + struct inode *inode, *h_inode, *dir, *h_dir; | |
17521 | + struct dentry *dentry; | |
17522 | + char *h_name; | |
17523 | + int h_nlen; | |
17524 | +}; | |
1308ab2a | 17525 | + |
4a4d8108 AM |
17526 | +static int hn_job(struct hn_job_args *a) |
17527 | +{ | |
17528 | + const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR); | |
076b876e | 17529 | + int e; |
1308ab2a | 17530 | + |
4a4d8108 AM |
17531 | + /* reset xino */ |
17532 | + if (au_ftest_hnjob(a->flags, XINO0) && a->inode) | |
17533 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
1308ab2a | 17534 | + |
4a4d8108 AM |
17535 | + if (au_ftest_hnjob(a->flags, TRYXINO0) |
17536 | + && a->inode | |
17537 | + && a->h_inode) { | |
be118d29 | 17538 | + inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); |
38d290e6 JR |
17539 | + if (!a->h_inode->i_nlink |
17540 | + && !(a->h_inode->i_state & I_LINKABLE)) | |
4a4d8108 | 17541 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ |
3c1bdaff | 17542 | + inode_unlock_shared(a->h_inode); |
1308ab2a | 17543 | + } |
1facf9fc | 17544 | + |
4a4d8108 AM |
17545 | + /* make the generation obsolete */ |
17546 | + if (au_ftest_hnjob(a->flags, GEN)) { | |
076b876e | 17547 | + e = -1; |
4a4d8108 | 17548 | + if (a->inode) |
076b876e | 17549 | + e = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode, |
4a4d8108 | 17550 | + isdir); |
076b876e | 17551 | + if (e && a->dentry) |
4a4d8108 AM |
17552 | + hn_gen_by_name(a->dentry, isdir); |
17553 | + /* ignore this error */ | |
1facf9fc | 17554 | + } |
1facf9fc | 17555 | + |
4a4d8108 AM |
17556 | + /* make dir entries obsolete */ |
17557 | + if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) { | |
17558 | + struct au_vdir *vdir; | |
1facf9fc | 17559 | + |
4a4d8108 AM |
17560 | + vdir = au_ivdir(a->inode); |
17561 | + if (vdir) | |
17562 | + vdir->vd_jiffy = 0; | |
17563 | + /* IMustLock(a->inode); */ | |
be118d29 | 17564 | + /* inode_inc_iversion(a->inode); */ |
4a4d8108 | 17565 | + } |
1facf9fc | 17566 | + |
4a4d8108 AM |
17567 | + /* can do nothing but warn */ |
17568 | + if (au_ftest_hnjob(a->flags, MNTPNT) | |
17569 | + && a->dentry | |
17570 | + && d_mountpoint(a->dentry)) | |
523b37e3 | 17571 | + pr_warn("mount-point %pd is removed or renamed\n", a->dentry); |
1facf9fc | 17572 | + |
4a4d8108 | 17573 | + return 0; |
1308ab2a | 17574 | +} |
1facf9fc | 17575 | + |
1308ab2a | 17576 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17577 | + |
4a4d8108 AM |
17578 | +static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen, |
17579 | + struct inode *dir) | |
1308ab2a | 17580 | +{ |
4a4d8108 AM |
17581 | + struct dentry *dentry, *d, *parent; |
17582 | + struct qstr *dname; | |
1308ab2a | 17583 | + |
c1595e42 | 17584 | + parent = d_find_any_alias(dir); |
4a4d8108 AM |
17585 | + if (!parent) |
17586 | + return NULL; | |
1308ab2a | 17587 | + |
4a4d8108 | 17588 | + dentry = NULL; |
027c5e7a | 17589 | + spin_lock(&parent->d_lock); |
c1595e42 | 17590 | + list_for_each_entry(d, &parent->d_subdirs, d_child) { |
523b37e3 | 17591 | + /* AuDbg("%pd\n", d); */ |
027c5e7a | 17592 | + spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); |
4a4d8108 AM |
17593 | + dname = &d->d_name; |
17594 | + if (dname->len != nlen || memcmp(dname->name, name, nlen)) | |
027c5e7a AM |
17595 | + goto cont_unlock; |
17596 | + if (au_di(d)) | |
17597 | + au_digen_dec(d); | |
17598 | + else | |
17599 | + goto cont_unlock; | |
c1595e42 | 17600 | + if (au_dcount(d) > 0) { |
027c5e7a | 17601 | + dentry = dget_dlock(d); |
4a4d8108 | 17602 | + spin_unlock(&d->d_lock); |
027c5e7a | 17603 | + break; |
dece6358 | 17604 | + } |
1facf9fc | 17605 | + |
f6b6e03d | 17606 | +cont_unlock: |
027c5e7a | 17607 | + spin_unlock(&d->d_lock); |
1308ab2a | 17608 | + } |
027c5e7a | 17609 | + spin_unlock(&parent->d_lock); |
4a4d8108 | 17610 | + dput(parent); |
1facf9fc | 17611 | + |
4a4d8108 AM |
17612 | + if (dentry) |
17613 | + di_write_lock_child(dentry); | |
1308ab2a | 17614 | + |
4a4d8108 AM |
17615 | + return dentry; |
17616 | +} | |
dece6358 | 17617 | + |
4a4d8108 AM |
17618 | +static struct inode *lookup_wlock_by_ino(struct super_block *sb, |
17619 | + aufs_bindex_t bindex, ino_t h_ino) | |
17620 | +{ | |
17621 | + struct inode *inode; | |
17622 | + ino_t ino; | |
17623 | + int err; | |
17624 | + | |
17625 | + inode = NULL; | |
17626 | + err = au_xino_read(sb, bindex, h_ino, &ino); | |
17627 | + if (!err && ino) | |
17628 | + inode = ilookup(sb, ino); | |
17629 | + if (!inode) | |
17630 | + goto out; | |
17631 | + | |
17632 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
0c3ec466 | 17633 | + pr_warn("wrong root branch\n"); |
4a4d8108 AM |
17634 | + iput(inode); |
17635 | + inode = NULL; | |
17636 | + goto out; | |
1308ab2a | 17637 | + } |
17638 | + | |
4a4d8108 | 17639 | + ii_write_lock_child(inode); |
1308ab2a | 17640 | + |
4f0767ce | 17641 | +out: |
4a4d8108 | 17642 | + return inode; |
dece6358 AM |
17643 | +} |
17644 | + | |
4a4d8108 | 17645 | +static void au_hn_bh(void *_args) |
1facf9fc | 17646 | +{ |
4a4d8108 AM |
17647 | + struct au_hnotify_args *a = _args; |
17648 | + struct super_block *sb; | |
5afbbe0d | 17649 | + aufs_bindex_t bindex, bbot, bfound; |
4a4d8108 | 17650 | + unsigned char xino, try_iput; |
1facf9fc | 17651 | + int err; |
1308ab2a | 17652 | + struct inode *inode; |
4a4d8108 AM |
17653 | + ino_t h_ino; |
17654 | + struct hn_job_args args; | |
17655 | + struct dentry *dentry; | |
17656 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 17657 | + |
4a4d8108 AM |
17658 | + AuDebugOn(!_args); |
17659 | + AuDebugOn(!a->h_dir); | |
17660 | + AuDebugOn(!a->dir); | |
17661 | + AuDebugOn(!a->mask); | |
17662 | + AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n", | |
17663 | + a->mask, a->dir->i_ino, a->h_dir->i_ino, | |
17664 | + a->h_child_inode ? a->h_child_inode->i_ino : 0); | |
1facf9fc | 17665 | + |
4a4d8108 AM |
17666 | + inode = NULL; |
17667 | + dentry = NULL; | |
17668 | + /* | |
17669 | + * do not lock a->dir->i_mutex here | |
17670 | + * because of d_revalidate() may cause a deadlock. | |
17671 | + */ | |
17672 | + sb = a->dir->i_sb; | |
17673 | + AuDebugOn(!sb); | |
17674 | + sbinfo = au_sbi(sb); | |
17675 | + AuDebugOn(!sbinfo); | |
7f207e10 | 17676 | + si_write_lock(sb, AuLock_NOPLMW); |
1facf9fc | 17677 | + |
8b6a4947 AM |
17678 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) |
17679 | + switch (a->mask & FS_EVENTS_POSS_ON_CHILD) { | |
17680 | + case FS_MOVED_FROM: | |
17681 | + case FS_MOVED_TO: | |
17682 | + AuWarn1("DIRREN with UDBA may not work correctly " | |
17683 | + "for the direct rename(2)\n"); | |
17684 | + } | |
17685 | + | |
4a4d8108 AM |
17686 | + ii_read_lock_parent(a->dir); |
17687 | + bfound = -1; | |
5afbbe0d AM |
17688 | + bbot = au_ibbot(a->dir); |
17689 | + for (bindex = au_ibtop(a->dir); bindex <= bbot; bindex++) | |
4a4d8108 AM |
17690 | + if (au_h_iptr(a->dir, bindex) == a->h_dir) { |
17691 | + bfound = bindex; | |
17692 | + break; | |
17693 | + } | |
17694 | + ii_read_unlock(a->dir); | |
17695 | + if (unlikely(bfound < 0)) | |
17696 | + goto out; | |
1facf9fc | 17697 | + |
4a4d8108 AM |
17698 | + xino = !!au_opt_test(au_mntflags(sb), XINO); |
17699 | + h_ino = 0; | |
17700 | + if (a->h_child_inode) | |
17701 | + h_ino = a->h_child_inode->i_ino; | |
1facf9fc | 17702 | + |
4a4d8108 AM |
17703 | + if (a->h_child_nlen |
17704 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN) | |
17705 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT))) | |
17706 | + dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen, | |
17707 | + a->dir); | |
17708 | + try_iput = 0; | |
5527c038 JR |
17709 | + if (dentry && d_really_is_positive(dentry)) |
17710 | + inode = d_inode(dentry); | |
4a4d8108 AM |
17711 | + if (xino && !inode && h_ino |
17712 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0) | |
17713 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0) | |
17714 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) { | |
17715 | + inode = lookup_wlock_by_ino(sb, bfound, h_ino); | |
17716 | + try_iput = 1; | |
f0c0a007 | 17717 | + } |
1facf9fc | 17718 | + |
4a4d8108 AM |
17719 | + args.flags = a->flags[AuHn_CHILD]; |
17720 | + args.dentry = dentry; | |
17721 | + args.inode = inode; | |
17722 | + args.h_inode = a->h_child_inode; | |
17723 | + args.dir = a->dir; | |
17724 | + args.h_dir = a->h_dir; | |
17725 | + args.h_name = a->h_child_name; | |
17726 | + args.h_nlen = a->h_child_nlen; | |
17727 | + err = hn_job(&args); | |
17728 | + if (dentry) { | |
027c5e7a | 17729 | + if (au_di(dentry)) |
4a4d8108 AM |
17730 | + di_write_unlock(dentry); |
17731 | + dput(dentry); | |
17732 | + } | |
17733 | + if (inode && try_iput) { | |
17734 | + ii_write_unlock(inode); | |
17735 | + iput(inode); | |
17736 | + } | |
1facf9fc | 17737 | + |
4a4d8108 AM |
17738 | + ii_write_lock_parent(a->dir); |
17739 | + args.flags = a->flags[AuHn_PARENT]; | |
17740 | + args.dentry = NULL; | |
17741 | + args.inode = a->dir; | |
17742 | + args.h_inode = a->h_dir; | |
17743 | + args.dir = NULL; | |
17744 | + args.h_dir = NULL; | |
17745 | + args.h_name = NULL; | |
17746 | + args.h_nlen = 0; | |
17747 | + err = hn_job(&args); | |
17748 | + ii_write_unlock(a->dir); | |
1facf9fc | 17749 | + |
4f0767ce | 17750 | +out: |
4a4d8108 AM |
17751 | + iput(a->h_child_inode); |
17752 | + iput(a->h_dir); | |
17753 | + iput(a->dir); | |
027c5e7a AM |
17754 | + si_write_unlock(sb); |
17755 | + au_nwt_done(&sbinfo->si_nowait); | |
1c60b727 | 17756 | + kfree(a); |
dece6358 | 17757 | +} |
1facf9fc | 17758 | + |
4a4d8108 AM |
17759 | +/* ---------------------------------------------------------------------- */ |
17760 | + | |
17761 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
17762 | + struct qstr *h_child_qstr, struct inode *h_child_inode) | |
dece6358 | 17763 | +{ |
4a4d8108 | 17764 | + int err, len; |
53392da6 | 17765 | + unsigned int flags[AuHnLast], f; |
4a4d8108 AM |
17766 | + unsigned char isdir, isroot, wh; |
17767 | + struct inode *dir; | |
17768 | + struct au_hnotify_args *args; | |
17769 | + char *p, *h_child_name; | |
dece6358 | 17770 | + |
1308ab2a | 17771 | + err = 0; |
4a4d8108 AM |
17772 | + AuDebugOn(!hnotify || !hnotify->hn_aufs_inode); |
17773 | + dir = igrab(hnotify->hn_aufs_inode); | |
17774 | + if (!dir) | |
17775 | + goto out; | |
1facf9fc | 17776 | + |
4a4d8108 AM |
17777 | + isroot = (dir->i_ino == AUFS_ROOT_INO); |
17778 | + wh = 0; | |
17779 | + h_child_name = (void *)h_child_qstr->name; | |
17780 | + len = h_child_qstr->len; | |
17781 | + if (h_child_name) { | |
17782 | + if (len > AUFS_WH_PFX_LEN | |
17783 | + && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
17784 | + h_child_name += AUFS_WH_PFX_LEN; | |
17785 | + len -= AUFS_WH_PFX_LEN; | |
17786 | + wh = 1; | |
17787 | + } | |
1facf9fc | 17788 | + } |
dece6358 | 17789 | + |
4a4d8108 AM |
17790 | + isdir = 0; |
17791 | + if (h_child_inode) | |
17792 | + isdir = !!S_ISDIR(h_child_inode->i_mode); | |
17793 | + flags[AuHn_PARENT] = AuHnJob_ISDIR; | |
17794 | + flags[AuHn_CHILD] = 0; | |
17795 | + if (isdir) | |
17796 | + flags[AuHn_CHILD] = AuHnJob_ISDIR; | |
17797 | + au_fset_hnjob(flags[AuHn_PARENT], DIRENT); | |
17798 | + au_fset_hnjob(flags[AuHn_CHILD], GEN); | |
17799 | + switch (mask & FS_EVENTS_POSS_ON_CHILD) { | |
17800 | + case FS_MOVED_FROM: | |
17801 | + case FS_MOVED_TO: | |
17802 | + au_fset_hnjob(flags[AuHn_CHILD], XINO0); | |
17803 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
17804 | + /*FALLTHROUGH*/ | |
17805 | + case FS_CREATE: | |
fb47a38f | 17806 | + AuDebugOn(!h_child_name); |
4a4d8108 | 17807 | + break; |
1facf9fc | 17808 | + |
4a4d8108 AM |
17809 | + case FS_DELETE: |
17810 | + /* | |
17811 | + * aufs never be able to get this child inode. | |
17812 | + * revalidation should be in d_revalidate() | |
17813 | + * by checking i_nlink, i_generation or d_unhashed(). | |
17814 | + */ | |
17815 | + AuDebugOn(!h_child_name); | |
17816 | + au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0); | |
17817 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
17818 | + break; | |
dece6358 | 17819 | + |
4a4d8108 AM |
17820 | + default: |
17821 | + AuDebugOn(1); | |
17822 | + } | |
1308ab2a | 17823 | + |
4a4d8108 AM |
17824 | + if (wh) |
17825 | + h_child_inode = NULL; | |
1308ab2a | 17826 | + |
4a4d8108 AM |
17827 | + err = -ENOMEM; |
17828 | + /* iput() and kfree() will be called in au_hnotify() */ | |
4a4d8108 | 17829 | + args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS); |
4a4d8108 AM |
17830 | + if (unlikely(!args)) { |
17831 | + AuErr1("no memory\n"); | |
17832 | + iput(dir); | |
17833 | + goto out; | |
17834 | + } | |
17835 | + args->flags[AuHn_PARENT] = flags[AuHn_PARENT]; | |
17836 | + args->flags[AuHn_CHILD] = flags[AuHn_CHILD]; | |
17837 | + args->mask = mask; | |
17838 | + args->dir = dir; | |
17839 | + args->h_dir = igrab(h_dir); | |
17840 | + if (h_child_inode) | |
17841 | + h_child_inode = igrab(h_child_inode); /* can be NULL */ | |
17842 | + args->h_child_inode = h_child_inode; | |
17843 | + args->h_child_nlen = len; | |
17844 | + if (len) { | |
17845 | + p = (void *)args; | |
17846 | + p += sizeof(*args); | |
17847 | + memcpy(p, h_child_name, len); | |
17848 | + p[len] = 0; | |
1308ab2a | 17849 | + } |
1308ab2a | 17850 | + |
38d290e6 | 17851 | + /* NFS fires the event for silly-renamed one from kworker */ |
53392da6 | 17852 | + f = 0; |
38d290e6 JR |
17853 | + if (!dir->i_nlink |
17854 | + || (au_test_nfs(h_dir->i_sb) && (mask & FS_DELETE))) | |
53392da6 AM |
17855 | + f = AuWkq_NEST; |
17856 | + err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f); | |
4a4d8108 AM |
17857 | + if (unlikely(err)) { |
17858 | + pr_err("wkq %d\n", err); | |
17859 | + iput(args->h_child_inode); | |
17860 | + iput(args->h_dir); | |
17861 | + iput(args->dir); | |
1c60b727 | 17862 | + kfree(args); |
1facf9fc | 17863 | + } |
1facf9fc | 17864 | + |
4a4d8108 | 17865 | +out: |
1facf9fc | 17866 | + return err; |
17867 | +} | |
17868 | + | |
027c5e7a AM |
17869 | +/* ---------------------------------------------------------------------- */ |
17870 | + | |
17871 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
17872 | +{ | |
17873 | + int err; | |
17874 | + | |
17875 | + AuDebugOn(!(udba & AuOptMask_UDBA)); | |
17876 | + | |
17877 | + err = 0; | |
17878 | + if (au_hnotify_op.reset_br) | |
17879 | + err = au_hnotify_op.reset_br(udba, br, perm); | |
17880 | + | |
17881 | + return err; | |
17882 | +} | |
17883 | + | |
17884 | +int au_hnotify_init_br(struct au_branch *br, int perm) | |
17885 | +{ | |
17886 | + int err; | |
17887 | + | |
17888 | + err = 0; | |
17889 | + if (au_hnotify_op.init_br) | |
17890 | + err = au_hnotify_op.init_br(br, perm); | |
17891 | + | |
17892 | + return err; | |
17893 | +} | |
17894 | + | |
17895 | +void au_hnotify_fin_br(struct au_branch *br) | |
17896 | +{ | |
17897 | + if (au_hnotify_op.fin_br) | |
17898 | + au_hnotify_op.fin_br(br); | |
17899 | +} | |
17900 | + | |
4a4d8108 AM |
17901 | +static void au_hn_destroy_cache(void) |
17902 | +{ | |
1c60b727 AM |
17903 | + kmem_cache_destroy(au_cache[AuCache_HNOTIFY]); |
17904 | + au_cache[AuCache_HNOTIFY] = NULL; | |
4a4d8108 | 17905 | +} |
1308ab2a | 17906 | + |
4a4d8108 | 17907 | +int __init au_hnotify_init(void) |
1facf9fc | 17908 | +{ |
1308ab2a | 17909 | + int err; |
1308ab2a | 17910 | + |
4a4d8108 | 17911 | + err = -ENOMEM; |
1c60b727 AM |
17912 | + au_cache[AuCache_HNOTIFY] = AuCache(au_hnotify); |
17913 | + if (au_cache[AuCache_HNOTIFY]) { | |
027c5e7a AM |
17914 | + err = 0; |
17915 | + if (au_hnotify_op.init) | |
17916 | + err = au_hnotify_op.init(); | |
4a4d8108 AM |
17917 | + if (unlikely(err)) |
17918 | + au_hn_destroy_cache(); | |
1308ab2a | 17919 | + } |
1308ab2a | 17920 | + AuTraceErr(err); |
4a4d8108 | 17921 | + return err; |
1308ab2a | 17922 | +} |
17923 | + | |
4a4d8108 | 17924 | +void au_hnotify_fin(void) |
1308ab2a | 17925 | +{ |
027c5e7a AM |
17926 | + if (au_hnotify_op.fin) |
17927 | + au_hnotify_op.fin(); | |
f0c0a007 | 17928 | + |
4a4d8108 | 17929 | + /* cf. au_cache_fin() */ |
1c60b727 | 17930 | + if (au_cache[AuCache_HNOTIFY]) |
4a4d8108 | 17931 | + au_hn_destroy_cache(); |
dece6358 | 17932 | +} |
7f207e10 AM |
17933 | diff -urN /usr/share/empty/fs/aufs/iinfo.c linux/fs/aufs/iinfo.c |
17934 | --- /usr/share/empty/fs/aufs/iinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 17935 | +++ linux/fs/aufs/iinfo.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 17936 | @@ -0,0 +1,286 @@ |
cd7a4cd9 | 17937 | +// SPDX-License-Identifier: GPL-2.0 |
dece6358 | 17938 | +/* |
b00004a5 | 17939 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
dece6358 AM |
17940 | + * |
17941 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17942 | + * it under the terms of the GNU General Public License as published by | |
17943 | + * the Free Software Foundation; either version 2 of the License, or | |
17944 | + * (at your option) any later version. | |
17945 | + * | |
17946 | + * This program is distributed in the hope that it will be useful, | |
17947 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17948 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17949 | + * GNU General Public License for more details. | |
17950 | + * | |
17951 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 17952 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 | 17953 | + */ |
1facf9fc | 17954 | + |
dece6358 | 17955 | +/* |
4a4d8108 | 17956 | + * inode private data |
dece6358 | 17957 | + */ |
1facf9fc | 17958 | + |
1308ab2a | 17959 | +#include "aufs.h" |
1facf9fc | 17960 | + |
4a4d8108 | 17961 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 17962 | +{ |
4a4d8108 | 17963 | + struct inode *h_inode; |
5afbbe0d | 17964 | + struct au_hinode *hinode; |
1facf9fc | 17965 | + |
4a4d8108 | 17966 | + IiMustAnyLock(inode); |
1facf9fc | 17967 | + |
5afbbe0d AM |
17968 | + hinode = au_hinode(au_ii(inode), bindex); |
17969 | + h_inode = hinode->hi_inode; | |
4a4d8108 AM |
17970 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); |
17971 | + return h_inode; | |
17972 | +} | |
1facf9fc | 17973 | + |
4a4d8108 AM |
17974 | +/* todo: hard/soft set? */ |
17975 | +void au_hiput(struct au_hinode *hinode) | |
17976 | +{ | |
17977 | + au_hn_free(hinode); | |
17978 | + dput(hinode->hi_whdentry); | |
17979 | + iput(hinode->hi_inode); | |
17980 | +} | |
1facf9fc | 17981 | + |
4a4d8108 AM |
17982 | +unsigned int au_hi_flags(struct inode *inode, int isdir) |
17983 | +{ | |
17984 | + unsigned int flags; | |
17985 | + const unsigned int mnt_flags = au_mntflags(inode->i_sb); | |
1facf9fc | 17986 | + |
4a4d8108 AM |
17987 | + flags = 0; |
17988 | + if (au_opt_test(mnt_flags, XINO)) | |
17989 | + au_fset_hi(flags, XINO); | |
17990 | + if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) | |
17991 | + au_fset_hi(flags, HNOTIFY); | |
17992 | + return flags; | |
1facf9fc | 17993 | +} |
17994 | + | |
4a4d8108 AM |
17995 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
17996 | + struct inode *h_inode, unsigned int flags) | |
1308ab2a | 17997 | +{ |
4a4d8108 AM |
17998 | + struct au_hinode *hinode; |
17999 | + struct inode *hi; | |
18000 | + struct au_iinfo *iinfo = au_ii(inode); | |
1facf9fc | 18001 | + |
4a4d8108 | 18002 | + IiMustWriteLock(inode); |
dece6358 | 18003 | + |
5afbbe0d | 18004 | + hinode = au_hinode(iinfo, bindex); |
4a4d8108 AM |
18005 | + hi = hinode->hi_inode; |
18006 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
18007 | + | |
18008 | + if (hi) | |
18009 | + au_hiput(hinode); | |
18010 | + hinode->hi_inode = h_inode; | |
18011 | + if (h_inode) { | |
18012 | + int err; | |
18013 | + struct super_block *sb = inode->i_sb; | |
18014 | + struct au_branch *br; | |
18015 | + | |
027c5e7a AM |
18016 | + AuDebugOn(inode->i_mode |
18017 | + && (h_inode->i_mode & S_IFMT) | |
18018 | + != (inode->i_mode & S_IFMT)); | |
5afbbe0d | 18019 | + if (bindex == iinfo->ii_btop) |
4a4d8108 AM |
18020 | + au_cpup_igen(inode, h_inode); |
18021 | + br = au_sbr(sb, bindex); | |
18022 | + hinode->hi_id = br->br_id; | |
18023 | + if (au_ftest_hi(flags, XINO)) { | |
18024 | + err = au_xino_write(sb, bindex, h_inode->i_ino, | |
18025 | + inode->i_ino); | |
18026 | + if (unlikely(err)) | |
18027 | + AuIOErr1("failed au_xino_write() %d\n", err); | |
18028 | + } | |
18029 | + | |
18030 | + if (au_ftest_hi(flags, HNOTIFY) | |
18031 | + && au_br_hnotifyable(br->br_perm)) { | |
027c5e7a | 18032 | + err = au_hn_alloc(hinode, inode); |
4a4d8108 AM |
18033 | + if (unlikely(err)) |
18034 | + AuIOErr1("au_hn_alloc() %d\n", err); | |
1308ab2a | 18035 | + } |
18036 | + } | |
4a4d8108 | 18037 | +} |
dece6358 | 18038 | + |
4a4d8108 AM |
18039 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, |
18040 | + struct dentry *h_wh) | |
18041 | +{ | |
18042 | + struct au_hinode *hinode; | |
dece6358 | 18043 | + |
4a4d8108 AM |
18044 | + IiMustWriteLock(inode); |
18045 | + | |
5afbbe0d | 18046 | + hinode = au_hinode(au_ii(inode), bindex); |
4a4d8108 AM |
18047 | + AuDebugOn(hinode->hi_whdentry); |
18048 | + hinode->hi_whdentry = h_wh; | |
1facf9fc | 18049 | +} |
18050 | + | |
537831f9 | 18051 | +void au_update_iigen(struct inode *inode, int half) |
1308ab2a | 18052 | +{ |
537831f9 AM |
18053 | + struct au_iinfo *iinfo; |
18054 | + struct au_iigen *iigen; | |
18055 | + unsigned int sigen; | |
18056 | + | |
18057 | + sigen = au_sigen(inode->i_sb); | |
18058 | + iinfo = au_ii(inode); | |
18059 | + iigen = &iinfo->ii_generation; | |
be52b249 | 18060 | + spin_lock(&iigen->ig_spin); |
537831f9 AM |
18061 | + iigen->ig_generation = sigen; |
18062 | + if (half) | |
18063 | + au_ig_fset(iigen->ig_flags, HALF_REFRESHED); | |
18064 | + else | |
18065 | + au_ig_fclr(iigen->ig_flags, HALF_REFRESHED); | |
be52b249 | 18066 | + spin_unlock(&iigen->ig_spin); |
4a4d8108 | 18067 | +} |
1facf9fc | 18068 | + |
4a4d8108 AM |
18069 | +/* it may be called at remount time, too */ |
18070 | +void au_update_ibrange(struct inode *inode, int do_put_zero) | |
18071 | +{ | |
18072 | + struct au_iinfo *iinfo; | |
5afbbe0d | 18073 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 18074 | + |
5afbbe0d | 18075 | + AuDebugOn(au_is_bad_inode(inode)); |
4a4d8108 | 18076 | + IiMustWriteLock(inode); |
1facf9fc | 18077 | + |
5afbbe0d AM |
18078 | + iinfo = au_ii(inode); |
18079 | + if (do_put_zero && iinfo->ii_btop >= 0) { | |
18080 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; | |
4a4d8108 AM |
18081 | + bindex++) { |
18082 | + struct inode *h_i; | |
1facf9fc | 18083 | + |
5afbbe0d | 18084 | + h_i = au_hinode(iinfo, bindex)->hi_inode; |
38d290e6 JR |
18085 | + if (h_i |
18086 | + && !h_i->i_nlink | |
18087 | + && !(h_i->i_state & I_LINKABLE)) | |
027c5e7a AM |
18088 | + au_set_h_iptr(inode, bindex, NULL, 0); |
18089 | + } | |
4a4d8108 AM |
18090 | + } |
18091 | + | |
5afbbe0d AM |
18092 | + iinfo->ii_btop = -1; |
18093 | + iinfo->ii_bbot = -1; | |
18094 | + bbot = au_sbbot(inode->i_sb); | |
18095 | + for (bindex = 0; bindex <= bbot; bindex++) | |
18096 | + if (au_hinode(iinfo, bindex)->hi_inode) { | |
18097 | + iinfo->ii_btop = bindex; | |
4a4d8108 | 18098 | + break; |
027c5e7a | 18099 | + } |
5afbbe0d AM |
18100 | + if (iinfo->ii_btop >= 0) |
18101 | + for (bindex = bbot; bindex >= iinfo->ii_btop; bindex--) | |
18102 | + if (au_hinode(iinfo, bindex)->hi_inode) { | |
18103 | + iinfo->ii_bbot = bindex; | |
027c5e7a AM |
18104 | + break; |
18105 | + } | |
5afbbe0d | 18106 | + AuDebugOn(iinfo->ii_btop > iinfo->ii_bbot); |
1308ab2a | 18107 | +} |
1facf9fc | 18108 | + |
dece6358 | 18109 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18110 | + |
4a4d8108 | 18111 | +void au_icntnr_init_once(void *_c) |
dece6358 | 18112 | +{ |
4a4d8108 AM |
18113 | + struct au_icntnr *c = _c; |
18114 | + struct au_iinfo *iinfo = &c->iinfo; | |
1facf9fc | 18115 | + |
be52b249 | 18116 | + spin_lock_init(&iinfo->ii_generation.ig_spin); |
4a4d8108 AM |
18117 | + au_rw_init(&iinfo->ii_rwsem); |
18118 | + inode_init_once(&c->vfs_inode); | |
18119 | +} | |
1facf9fc | 18120 | + |
5afbbe0d AM |
18121 | +void au_hinode_init(struct au_hinode *hinode) |
18122 | +{ | |
18123 | + hinode->hi_inode = NULL; | |
18124 | + hinode->hi_id = -1; | |
18125 | + au_hn_init(hinode); | |
18126 | + hinode->hi_whdentry = NULL; | |
18127 | +} | |
18128 | + | |
4a4d8108 AM |
18129 | +int au_iinfo_init(struct inode *inode) |
18130 | +{ | |
18131 | + struct au_iinfo *iinfo; | |
18132 | + struct super_block *sb; | |
5afbbe0d | 18133 | + struct au_hinode *hi; |
4a4d8108 | 18134 | + int nbr, i; |
1facf9fc | 18135 | + |
4a4d8108 AM |
18136 | + sb = inode->i_sb; |
18137 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
5afbbe0d | 18138 | + nbr = au_sbbot(sb) + 1; |
4a4d8108 AM |
18139 | + if (unlikely(nbr <= 0)) |
18140 | + nbr = 1; | |
5afbbe0d AM |
18141 | + hi = kmalloc_array(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); |
18142 | + if (hi) { | |
7f207e10 | 18143 | + au_ninodes_inc(sb); |
5afbbe0d AM |
18144 | + |
18145 | + iinfo->ii_hinode = hi; | |
18146 | + for (i = 0; i < nbr; i++, hi++) | |
18147 | + au_hinode_init(hi); | |
1facf9fc | 18148 | + |
537831f9 | 18149 | + iinfo->ii_generation.ig_generation = au_sigen(sb); |
5afbbe0d AM |
18150 | + iinfo->ii_btop = -1; |
18151 | + iinfo->ii_bbot = -1; | |
4a4d8108 AM |
18152 | + iinfo->ii_vdir = NULL; |
18153 | + return 0; | |
1308ab2a | 18154 | + } |
4a4d8108 AM |
18155 | + return -ENOMEM; |
18156 | +} | |
1facf9fc | 18157 | + |
e2f27e51 | 18158 | +int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink) |
4a4d8108 | 18159 | +{ |
5afbbe0d | 18160 | + int err, i; |
4a4d8108 | 18161 | + struct au_hinode *hip; |
1facf9fc | 18162 | + |
4a4d8108 AM |
18163 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
18164 | + | |
18165 | + err = -ENOMEM; | |
e2f27e51 AM |
18166 | + hip = au_krealloc(iinfo->ii_hinode, sizeof(*hip) * nbr, GFP_NOFS, |
18167 | + may_shrink); | |
4a4d8108 AM |
18168 | + if (hip) { |
18169 | + iinfo->ii_hinode = hip; | |
5afbbe0d AM |
18170 | + i = iinfo->ii_bbot + 1; |
18171 | + hip += i; | |
18172 | + for (; i < nbr; i++, hip++) | |
18173 | + au_hinode_init(hip); | |
4a4d8108 | 18174 | + err = 0; |
1308ab2a | 18175 | + } |
4a4d8108 | 18176 | + |
1308ab2a | 18177 | + return err; |
1facf9fc | 18178 | +} |
18179 | + | |
4a4d8108 | 18180 | +void au_iinfo_fin(struct inode *inode) |
1facf9fc | 18181 | +{ |
4a4d8108 AM |
18182 | + struct au_iinfo *iinfo; |
18183 | + struct au_hinode *hi; | |
18184 | + struct super_block *sb; | |
5afbbe0d | 18185 | + aufs_bindex_t bindex, bbot; |
b752ccd1 | 18186 | + const unsigned char unlinked = !inode->i_nlink; |
1308ab2a | 18187 | + |
5afbbe0d | 18188 | + AuDebugOn(au_is_bad_inode(inode)); |
1308ab2a | 18189 | + |
b752ccd1 | 18190 | + sb = inode->i_sb; |
7f207e10 | 18191 | + au_ninodes_dec(sb); |
b752ccd1 AM |
18192 | + if (si_pid_test(sb)) |
18193 | + au_xino_delete_inode(inode, unlinked); | |
18194 | + else { | |
18195 | + /* | |
18196 | + * it is safe to hide the dependency between sbinfo and | |
18197 | + * sb->s_umount. | |
18198 | + */ | |
18199 | + lockdep_off(); | |
18200 | + si_noflush_read_lock(sb); | |
18201 | + au_xino_delete_inode(inode, unlinked); | |
18202 | + si_read_unlock(sb); | |
18203 | + lockdep_on(); | |
18204 | + } | |
18205 | + | |
5afbbe0d | 18206 | + iinfo = au_ii(inode); |
4a4d8108 | 18207 | + if (iinfo->ii_vdir) |
1c60b727 | 18208 | + au_vdir_free(iinfo->ii_vdir); |
1308ab2a | 18209 | + |
5afbbe0d | 18210 | + bindex = iinfo->ii_btop; |
b752ccd1 | 18211 | + if (bindex >= 0) { |
5afbbe0d AM |
18212 | + hi = au_hinode(iinfo, bindex); |
18213 | + bbot = iinfo->ii_bbot; | |
18214 | + while (bindex++ <= bbot) { | |
b752ccd1 | 18215 | + if (hi->hi_inode) |
4a4d8108 | 18216 | + au_hiput(hi); |
4a4d8108 AM |
18217 | + hi++; |
18218 | + } | |
18219 | + } | |
1c60b727 | 18220 | + kfree(iinfo->ii_hinode); |
4a4d8108 | 18221 | + AuRwDestroy(&iinfo->ii_rwsem); |
dece6358 | 18222 | +} |
7f207e10 AM |
18223 | diff -urN /usr/share/empty/fs/aufs/inode.c linux/fs/aufs/inode.c |
18224 | --- /usr/share/empty/fs/aufs/inode.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 18225 | +++ linux/fs/aufs/inode.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 18226 | @@ -0,0 +1,528 @@ |
cd7a4cd9 | 18227 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 18228 | +/* |
b00004a5 | 18229 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
18230 | + * |
18231 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18232 | + * it under the terms of the GNU General Public License as published by | |
18233 | + * the Free Software Foundation; either version 2 of the License, or | |
18234 | + * (at your option) any later version. | |
18235 | + * | |
18236 | + * This program is distributed in the hope that it will be useful, | |
18237 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18238 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18239 | + * GNU General Public License for more details. | |
18240 | + * | |
18241 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 18242 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 18243 | + */ |
1facf9fc | 18244 | + |
4a4d8108 AM |
18245 | +/* |
18246 | + * inode functions | |
18247 | + */ | |
1facf9fc | 18248 | + |
4a4d8108 | 18249 | +#include "aufs.h" |
1308ab2a | 18250 | + |
4a4d8108 AM |
18251 | +struct inode *au_igrab(struct inode *inode) |
18252 | +{ | |
18253 | + if (inode) { | |
18254 | + AuDebugOn(!atomic_read(&inode->i_count)); | |
027c5e7a | 18255 | + ihold(inode); |
1facf9fc | 18256 | + } |
4a4d8108 AM |
18257 | + return inode; |
18258 | +} | |
1facf9fc | 18259 | + |
4a4d8108 AM |
18260 | +static void au_refresh_hinode_attr(struct inode *inode, int do_version) |
18261 | +{ | |
18262 | + au_cpup_attr_all(inode, /*force*/0); | |
537831f9 | 18263 | + au_update_iigen(inode, /*half*/1); |
4a4d8108 | 18264 | + if (do_version) |
be118d29 | 18265 | + inode_inc_iversion(inode); |
dece6358 | 18266 | +} |
1facf9fc | 18267 | + |
027c5e7a | 18268 | +static int au_ii_refresh(struct inode *inode, int *update) |
dece6358 | 18269 | +{ |
e2f27e51 | 18270 | + int err, e, nbr; |
027c5e7a | 18271 | + umode_t type; |
4a4d8108 | 18272 | + aufs_bindex_t bindex, new_bindex; |
1308ab2a | 18273 | + struct super_block *sb; |
4a4d8108 | 18274 | + struct au_iinfo *iinfo; |
027c5e7a | 18275 | + struct au_hinode *p, *q, tmp; |
1facf9fc | 18276 | + |
5afbbe0d | 18277 | + AuDebugOn(au_is_bad_inode(inode)); |
4a4d8108 | 18278 | + IiMustWriteLock(inode); |
1facf9fc | 18279 | + |
027c5e7a | 18280 | + *update = 0; |
4a4d8108 | 18281 | + sb = inode->i_sb; |
e2f27e51 | 18282 | + nbr = au_sbbot(sb) + 1; |
027c5e7a | 18283 | + type = inode->i_mode & S_IFMT; |
4a4d8108 | 18284 | + iinfo = au_ii(inode); |
e2f27e51 | 18285 | + err = au_hinode_realloc(iinfo, nbr, /*may_shrink*/0); |
4a4d8108 | 18286 | + if (unlikely(err)) |
1308ab2a | 18287 | + goto out; |
1facf9fc | 18288 | + |
5afbbe0d AM |
18289 | + AuDebugOn(iinfo->ii_btop < 0); |
18290 | + p = au_hinode(iinfo, iinfo->ii_btop); | |
18291 | + for (bindex = iinfo->ii_btop; bindex <= iinfo->ii_bbot; | |
4a4d8108 AM |
18292 | + bindex++, p++) { |
18293 | + if (!p->hi_inode) | |
18294 | + continue; | |
1facf9fc | 18295 | + |
027c5e7a | 18296 | + AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT)); |
4a4d8108 AM |
18297 | + new_bindex = au_br_index(sb, p->hi_id); |
18298 | + if (new_bindex == bindex) | |
18299 | + continue; | |
1facf9fc | 18300 | + |
4a4d8108 | 18301 | + if (new_bindex < 0) { |
027c5e7a | 18302 | + *update = 1; |
4a4d8108 AM |
18303 | + au_hiput(p); |
18304 | + p->hi_inode = NULL; | |
18305 | + continue; | |
1308ab2a | 18306 | + } |
4a4d8108 | 18307 | + |
5afbbe0d AM |
18308 | + if (new_bindex < iinfo->ii_btop) |
18309 | + iinfo->ii_btop = new_bindex; | |
18310 | + if (iinfo->ii_bbot < new_bindex) | |
18311 | + iinfo->ii_bbot = new_bindex; | |
4a4d8108 | 18312 | + /* swap two lower inode, and loop again */ |
5afbbe0d | 18313 | + q = au_hinode(iinfo, new_bindex); |
4a4d8108 AM |
18314 | + tmp = *q; |
18315 | + *q = *p; | |
18316 | + *p = tmp; | |
18317 | + if (tmp.hi_inode) { | |
18318 | + bindex--; | |
18319 | + p--; | |
1308ab2a | 18320 | + } |
18321 | + } | |
4a4d8108 | 18322 | + au_update_ibrange(inode, /*do_put_zero*/0); |
e2f27e51 | 18323 | + au_hinode_realloc(iinfo, nbr, /*may_shrink*/1); /* harmless if err */ |
4a4d8108 AM |
18324 | + e = au_dy_irefresh(inode); |
18325 | + if (unlikely(e && !err)) | |
18326 | + err = e; | |
1facf9fc | 18327 | + |
4f0767ce | 18328 | +out: |
027c5e7a AM |
18329 | + AuTraceErr(err); |
18330 | + return err; | |
18331 | +} | |
18332 | + | |
b95c5147 AM |
18333 | +void au_refresh_iop(struct inode *inode, int force_getattr) |
18334 | +{ | |
18335 | + int type; | |
18336 | + struct au_sbinfo *sbi = au_sbi(inode->i_sb); | |
18337 | + const struct inode_operations *iop | |
18338 | + = force_getattr ? aufs_iop : sbi->si_iop_array; | |
18339 | + | |
18340 | + if (inode->i_op == iop) | |
18341 | + return; | |
18342 | + | |
18343 | + switch (inode->i_mode & S_IFMT) { | |
18344 | + case S_IFDIR: | |
18345 | + type = AuIop_DIR; | |
18346 | + break; | |
18347 | + case S_IFLNK: | |
18348 | + type = AuIop_SYMLINK; | |
18349 | + break; | |
18350 | + default: | |
18351 | + type = AuIop_OTHER; | |
18352 | + break; | |
18353 | + } | |
18354 | + | |
18355 | + inode->i_op = iop + type; | |
18356 | + /* unnecessary smp_wmb() */ | |
18357 | +} | |
18358 | + | |
027c5e7a AM |
18359 | +int au_refresh_hinode_self(struct inode *inode) |
18360 | +{ | |
18361 | + int err, update; | |
18362 | + | |
18363 | + err = au_ii_refresh(inode, &update); | |
18364 | + if (!err) | |
18365 | + au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode)); | |
18366 | + | |
18367 | + AuTraceErr(err); | |
4a4d8108 AM |
18368 | + return err; |
18369 | +} | |
1facf9fc | 18370 | + |
4a4d8108 AM |
18371 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry) |
18372 | +{ | |
027c5e7a | 18373 | + int err, e, update; |
4a4d8108 | 18374 | + unsigned int flags; |
027c5e7a | 18375 | + umode_t mode; |
5afbbe0d | 18376 | + aufs_bindex_t bindex, bbot; |
027c5e7a | 18377 | + unsigned char isdir; |
4a4d8108 AM |
18378 | + struct au_hinode *p; |
18379 | + struct au_iinfo *iinfo; | |
1facf9fc | 18380 | + |
027c5e7a | 18381 | + err = au_ii_refresh(inode, &update); |
4a4d8108 AM |
18382 | + if (unlikely(err)) |
18383 | + goto out; | |
18384 | + | |
18385 | + update = 0; | |
18386 | + iinfo = au_ii(inode); | |
5afbbe0d | 18387 | + p = au_hinode(iinfo, iinfo->ii_btop); |
027c5e7a AM |
18388 | + mode = (inode->i_mode & S_IFMT); |
18389 | + isdir = S_ISDIR(mode); | |
4a4d8108 | 18390 | + flags = au_hi_flags(inode, isdir); |
5afbbe0d AM |
18391 | + bbot = au_dbbot(dentry); |
18392 | + for (bindex = au_dbtop(dentry); bindex <= bbot; bindex++) { | |
5527c038 | 18393 | + struct inode *h_i, *h_inode; |
4a4d8108 AM |
18394 | + struct dentry *h_d; |
18395 | + | |
18396 | + h_d = au_h_dptr(dentry, bindex); | |
5527c038 | 18397 | + if (!h_d || d_is_negative(h_d)) |
4a4d8108 AM |
18398 | + continue; |
18399 | + | |
5527c038 JR |
18400 | + h_inode = d_inode(h_d); |
18401 | + AuDebugOn(mode != (h_inode->i_mode & S_IFMT)); | |
5afbbe0d | 18402 | + if (iinfo->ii_btop <= bindex && bindex <= iinfo->ii_bbot) { |
4a4d8108 AM |
18403 | + h_i = au_h_iptr(inode, bindex); |
18404 | + if (h_i) { | |
5527c038 | 18405 | + if (h_i == h_inode) |
4a4d8108 AM |
18406 | + continue; |
18407 | + err = -EIO; | |
18408 | + break; | |
18409 | + } | |
18410 | + } | |
5afbbe0d AM |
18411 | + if (bindex < iinfo->ii_btop) |
18412 | + iinfo->ii_btop = bindex; | |
18413 | + if (iinfo->ii_bbot < bindex) | |
18414 | + iinfo->ii_bbot = bindex; | |
5527c038 | 18415 | + au_set_h_iptr(inode, bindex, au_igrab(h_inode), flags); |
4a4d8108 | 18416 | + update = 1; |
1308ab2a | 18417 | + } |
4a4d8108 AM |
18418 | + au_update_ibrange(inode, /*do_put_zero*/0); |
18419 | + e = au_dy_irefresh(inode); | |
18420 | + if (unlikely(e && !err)) | |
18421 | + err = e; | |
027c5e7a AM |
18422 | + if (!err) |
18423 | + au_refresh_hinode_attr(inode, update && isdir); | |
4a4d8108 | 18424 | + |
4f0767ce | 18425 | +out: |
4a4d8108 | 18426 | + AuTraceErr(err); |
1308ab2a | 18427 | + return err; |
dece6358 AM |
18428 | +} |
18429 | + | |
4a4d8108 | 18430 | +static int set_inode(struct inode *inode, struct dentry *dentry) |
dece6358 | 18431 | +{ |
4a4d8108 AM |
18432 | + int err; |
18433 | + unsigned int flags; | |
18434 | + umode_t mode; | |
5afbbe0d | 18435 | + aufs_bindex_t bindex, btop, btail; |
4a4d8108 AM |
18436 | + unsigned char isdir; |
18437 | + struct dentry *h_dentry; | |
18438 | + struct inode *h_inode; | |
18439 | + struct au_iinfo *iinfo; | |
b95c5147 | 18440 | + struct inode_operations *iop; |
dece6358 | 18441 | + |
4a4d8108 | 18442 | + IiMustWriteLock(inode); |
dece6358 | 18443 | + |
4a4d8108 AM |
18444 | + err = 0; |
18445 | + isdir = 0; | |
b95c5147 | 18446 | + iop = au_sbi(inode->i_sb)->si_iop_array; |
5afbbe0d AM |
18447 | + btop = au_dbtop(dentry); |
18448 | + h_dentry = au_h_dptr(dentry, btop); | |
5527c038 | 18449 | + h_inode = d_inode(h_dentry); |
4a4d8108 AM |
18450 | + mode = h_inode->i_mode; |
18451 | + switch (mode & S_IFMT) { | |
18452 | + case S_IFREG: | |
18453 | + btail = au_dbtail(dentry); | |
b95c5147 | 18454 | + inode->i_op = iop + AuIop_OTHER; |
4a4d8108 | 18455 | + inode->i_fop = &aufs_file_fop; |
5afbbe0d | 18456 | + err = au_dy_iaop(inode, btop, h_inode); |
4a4d8108 AM |
18457 | + if (unlikely(err)) |
18458 | + goto out; | |
18459 | + break; | |
18460 | + case S_IFDIR: | |
18461 | + isdir = 1; | |
18462 | + btail = au_dbtaildir(dentry); | |
b95c5147 | 18463 | + inode->i_op = iop + AuIop_DIR; |
4a4d8108 AM |
18464 | + inode->i_fop = &aufs_dir_fop; |
18465 | + break; | |
18466 | + case S_IFLNK: | |
18467 | + btail = au_dbtail(dentry); | |
b95c5147 | 18468 | + inode->i_op = iop + AuIop_SYMLINK; |
4a4d8108 AM |
18469 | + break; |
18470 | + case S_IFBLK: | |
18471 | + case S_IFCHR: | |
18472 | + case S_IFIFO: | |
18473 | + case S_IFSOCK: | |
18474 | + btail = au_dbtail(dentry); | |
b95c5147 | 18475 | + inode->i_op = iop + AuIop_OTHER; |
38d290e6 | 18476 | + init_special_inode(inode, mode, h_inode->i_rdev); |
4a4d8108 AM |
18477 | + break; |
18478 | + default: | |
18479 | + AuIOErr("Unknown file type 0%o\n", mode); | |
18480 | + err = -EIO; | |
1308ab2a | 18481 | + goto out; |
4a4d8108 | 18482 | + } |
dece6358 | 18483 | + |
4a4d8108 AM |
18484 | + /* do not set hnotify for whiteouted dirs (SHWH mode) */ |
18485 | + flags = au_hi_flags(inode, isdir); | |
18486 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH) | |
18487 | + && au_ftest_hi(flags, HNOTIFY) | |
18488 | + && dentry->d_name.len > AUFS_WH_PFX_LEN | |
18489 | + && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) | |
18490 | + au_fclr_hi(flags, HNOTIFY); | |
18491 | + iinfo = au_ii(inode); | |
5afbbe0d AM |
18492 | + iinfo->ii_btop = btop; |
18493 | + iinfo->ii_bbot = btail; | |
18494 | + for (bindex = btop; bindex <= btail; bindex++) { | |
4a4d8108 AM |
18495 | + h_dentry = au_h_dptr(dentry, bindex); |
18496 | + if (h_dentry) | |
18497 | + au_set_h_iptr(inode, bindex, | |
5527c038 | 18498 | + au_igrab(d_inode(h_dentry)), flags); |
4a4d8108 AM |
18499 | + } |
18500 | + au_cpup_attr_all(inode, /*force*/1); | |
c1595e42 JR |
18501 | + /* |
18502 | + * to force calling aufs_get_acl() every time, | |
18503 | + * do not call cache_no_acl() for aufs inode. | |
18504 | + */ | |
dece6358 | 18505 | + |
4f0767ce | 18506 | +out: |
4a4d8108 AM |
18507 | + return err; |
18508 | +} | |
dece6358 | 18509 | + |
027c5e7a AM |
18510 | +/* |
18511 | + * successful returns with iinfo write_locked | |
18512 | + * minus: errno | |
18513 | + * zero: success, matched | |
18514 | + * plus: no error, but unmatched | |
18515 | + */ | |
18516 | +static int reval_inode(struct inode *inode, struct dentry *dentry) | |
4a4d8108 AM |
18517 | +{ |
18518 | + int err; | |
cfc41e69 | 18519 | + unsigned int gen, igflags; |
5afbbe0d | 18520 | + aufs_bindex_t bindex, bbot; |
4a4d8108 | 18521 | + struct inode *h_inode, *h_dinode; |
5527c038 | 18522 | + struct dentry *h_dentry; |
dece6358 | 18523 | + |
4a4d8108 AM |
18524 | + /* |
18525 | + * before this function, if aufs got any iinfo lock, it must be only | |
18526 | + * one, the parent dir. | |
18527 | + * it can happen by UDBA and the obsoleted inode number. | |
18528 | + */ | |
18529 | + err = -EIO; | |
18530 | + if (unlikely(inode->i_ino == parent_ino(dentry))) | |
18531 | + goto out; | |
18532 | + | |
027c5e7a | 18533 | + err = 1; |
4a4d8108 | 18534 | + ii_write_lock_new_child(inode); |
5afbbe0d | 18535 | + h_dentry = au_h_dptr(dentry, au_dbtop(dentry)); |
5527c038 | 18536 | + h_dinode = d_inode(h_dentry); |
5afbbe0d AM |
18537 | + bbot = au_ibbot(inode); |
18538 | + for (bindex = au_ibtop(inode); bindex <= bbot; bindex++) { | |
4a4d8108 | 18539 | + h_inode = au_h_iptr(inode, bindex); |
537831f9 AM |
18540 | + if (!h_inode || h_inode != h_dinode) |
18541 | + continue; | |
18542 | + | |
18543 | + err = 0; | |
cfc41e69 | 18544 | + gen = au_iigen(inode, &igflags); |
537831f9 | 18545 | + if (gen == au_digen(dentry) |
cfc41e69 | 18546 | + && !au_ig_ftest(igflags, HALF_REFRESHED)) |
4a4d8108 | 18547 | + break; |
537831f9 AM |
18548 | + |
18549 | + /* fully refresh inode using dentry */ | |
18550 | + err = au_refresh_hinode(inode, dentry); | |
18551 | + if (!err) | |
18552 | + au_update_iigen(inode, /*half*/0); | |
18553 | + break; | |
1facf9fc | 18554 | + } |
dece6358 | 18555 | + |
4a4d8108 AM |
18556 | + if (unlikely(err)) |
18557 | + ii_write_unlock(inode); | |
4f0767ce | 18558 | +out: |
1facf9fc | 18559 | + return err; |
18560 | +} | |
1facf9fc | 18561 | + |
4a4d8108 AM |
18562 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
18563 | + unsigned int d_type, ino_t *ino) | |
1facf9fc | 18564 | +{ |
521ced18 JR |
18565 | + int err, idx; |
18566 | + const int isnondir = d_type != DT_DIR; | |
1facf9fc | 18567 | + |
b752ccd1 | 18568 | + /* prevent hardlinked inode number from race condition */ |
521ced18 JR |
18569 | + if (isnondir) { |
18570 | + err = au_xinondir_enter(sb, bindex, h_ino, &idx); | |
18571 | + if (unlikely(err)) | |
18572 | + goto out; | |
4a4d8108 | 18573 | + } |
521ced18 | 18574 | + |
4a4d8108 AM |
18575 | + err = au_xino_read(sb, bindex, h_ino, ino); |
18576 | + if (unlikely(err)) | |
521ced18 | 18577 | + goto out_xinondir; |
1308ab2a | 18578 | + |
4a4d8108 AM |
18579 | + if (!*ino) { |
18580 | + err = -EIO; | |
18581 | + *ino = au_xino_new_ino(sb); | |
18582 | + if (unlikely(!*ino)) | |
521ced18 | 18583 | + goto out_xinondir; |
4a4d8108 AM |
18584 | + err = au_xino_write(sb, bindex, h_ino, *ino); |
18585 | + if (unlikely(err)) | |
521ced18 | 18586 | + goto out_xinondir; |
1308ab2a | 18587 | + } |
1facf9fc | 18588 | + |
521ced18 JR |
18589 | +out_xinondir: |
18590 | + if (isnondir && idx >= 0) | |
18591 | + au_xinondir_leave(sb, bindex, h_ino, idx); | |
4f0767ce | 18592 | +out: |
1facf9fc | 18593 | + return err; |
18594 | +} | |
18595 | + | |
4a4d8108 AM |
18596 | +/* successful returns with iinfo write_locked */ |
18597 | +/* todo: return with unlocked? */ | |
18598 | +struct inode *au_new_inode(struct dentry *dentry, int must_new) | |
1facf9fc | 18599 | +{ |
5527c038 | 18600 | + struct inode *inode, *h_inode; |
4a4d8108 AM |
18601 | + struct dentry *h_dentry; |
18602 | + struct super_block *sb; | |
18603 | + ino_t h_ino, ino; | |
521ced18 | 18604 | + int err, idx, hlinked; |
5afbbe0d | 18605 | + aufs_bindex_t btop; |
1facf9fc | 18606 | + |
4a4d8108 | 18607 | + sb = dentry->d_sb; |
5afbbe0d AM |
18608 | + btop = au_dbtop(dentry); |
18609 | + h_dentry = au_h_dptr(dentry, btop); | |
5527c038 JR |
18610 | + h_inode = d_inode(h_dentry); |
18611 | + h_ino = h_inode->i_ino; | |
521ced18 | 18612 | + hlinked = !d_is_dir(h_dentry) && h_inode->i_nlink > 1; |
b752ccd1 | 18613 | + |
521ced18 | 18614 | +new_ino: |
b752ccd1 AM |
18615 | + /* |
18616 | + * stop 'race'-ing between hardlinks under different | |
18617 | + * parents. | |
18618 | + */ | |
521ced18 JR |
18619 | + if (hlinked) { |
18620 | + err = au_xinondir_enter(sb, btop, h_ino, &idx); | |
18621 | + inode = ERR_PTR(err); | |
18622 | + if (unlikely(err)) | |
18623 | + goto out; | |
18624 | + } | |
b752ccd1 | 18625 | + |
5afbbe0d | 18626 | + err = au_xino_read(sb, btop, h_ino, &ino); |
4a4d8108 AM |
18627 | + inode = ERR_PTR(err); |
18628 | + if (unlikely(err)) | |
521ced18 | 18629 | + goto out_xinondir; |
b752ccd1 | 18630 | + |
4a4d8108 AM |
18631 | + if (!ino) { |
18632 | + ino = au_xino_new_ino(sb); | |
18633 | + if (unlikely(!ino)) { | |
18634 | + inode = ERR_PTR(-EIO); | |
521ced18 | 18635 | + goto out_xinondir; |
dece6358 AM |
18636 | + } |
18637 | + } | |
1facf9fc | 18638 | + |
4a4d8108 AM |
18639 | + AuDbg("i%lu\n", (unsigned long)ino); |
18640 | + inode = au_iget_locked(sb, ino); | |
18641 | + err = PTR_ERR(inode); | |
18642 | + if (IS_ERR(inode)) | |
521ced18 | 18643 | + goto out_xinondir; |
1facf9fc | 18644 | + |
4a4d8108 AM |
18645 | + AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW)); |
18646 | + if (inode->i_state & I_NEW) { | |
18647 | + ii_write_lock_new_child(inode); | |
18648 | + err = set_inode(inode, dentry); | |
18649 | + if (!err) { | |
18650 | + unlock_new_inode(inode); | |
521ced18 | 18651 | + goto out_xinondir; /* success */ |
4a4d8108 | 18652 | + } |
1308ab2a | 18653 | + |
027c5e7a AM |
18654 | + /* |
18655 | + * iget_failed() calls iput(), but we need to call | |
18656 | + * ii_write_unlock() after iget_failed(). so dirty hack for | |
18657 | + * i_count. | |
18658 | + */ | |
18659 | + atomic_inc(&inode->i_count); | |
4a4d8108 | 18660 | + iget_failed(inode); |
027c5e7a | 18661 | + ii_write_unlock(inode); |
5afbbe0d | 18662 | + au_xino_write(sb, btop, h_ino, /*ino*/0); |
027c5e7a AM |
18663 | + /* ignore this error */ |
18664 | + goto out_iput; | |
18665 | + } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) { | |
b752ccd1 AM |
18666 | + /* |
18667 | + * horrible race condition between lookup, readdir and copyup | |
18668 | + * (or something). | |
18669 | + */ | |
521ced18 JR |
18670 | + if (hlinked && idx >= 0) |
18671 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
027c5e7a AM |
18672 | + err = reval_inode(inode, dentry); |
18673 | + if (unlikely(err < 0)) { | |
521ced18 | 18674 | + hlinked = 0; |
027c5e7a AM |
18675 | + goto out_iput; |
18676 | + } | |
521ced18 | 18677 | + if (!err) |
4a4d8108 | 18678 | + goto out; /* success */ |
521ced18 JR |
18679 | + else if (hlinked && idx >= 0) { |
18680 | + err = au_xinondir_enter(sb, btop, h_ino, &idx); | |
18681 | + if (unlikely(err)) { | |
18682 | + iput(inode); | |
18683 | + inode = ERR_PTR(err); | |
18684 | + goto out; | |
18685 | + } | |
18686 | + } | |
4a4d8108 AM |
18687 | + } |
18688 | + | |
5527c038 | 18689 | + if (unlikely(au_test_fs_unique_ino(h_inode))) |
4a4d8108 | 18690 | + AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir," |
523b37e3 | 18691 | + " b%d, %s, %pd, hi%lu, i%lu.\n", |
5afbbe0d | 18692 | + btop, au_sbtype(h_dentry->d_sb), dentry, |
4a4d8108 AM |
18693 | + (unsigned long)h_ino, (unsigned long)ino); |
18694 | + ino = 0; | |
5afbbe0d | 18695 | + err = au_xino_write(sb, btop, h_ino, /*ino*/0); |
4a4d8108 AM |
18696 | + if (!err) { |
18697 | + iput(inode); | |
521ced18 JR |
18698 | + if (hlinked && idx >= 0) |
18699 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
4a4d8108 AM |
18700 | + goto new_ino; |
18701 | + } | |
1308ab2a | 18702 | + |
4f0767ce | 18703 | +out_iput: |
4a4d8108 | 18704 | + iput(inode); |
4a4d8108 | 18705 | + inode = ERR_PTR(err); |
521ced18 JR |
18706 | +out_xinondir: |
18707 | + if (hlinked && idx >= 0) | |
18708 | + au_xinondir_leave(sb, btop, h_ino, idx); | |
4f0767ce | 18709 | +out: |
4a4d8108 | 18710 | + return inode; |
1facf9fc | 18711 | +} |
18712 | + | |
4a4d8108 | 18713 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18714 | + |
4a4d8108 AM |
18715 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, |
18716 | + struct inode *inode) | |
18717 | +{ | |
18718 | + int err; | |
076b876e | 18719 | + struct inode *hi; |
1facf9fc | 18720 | + |
4a4d8108 | 18721 | + err = au_br_rdonly(au_sbr(sb, bindex)); |
1facf9fc | 18722 | + |
4a4d8108 AM |
18723 | + /* pseudo-link after flushed may happen out of bounds */ |
18724 | + if (!err | |
18725 | + && inode | |
5afbbe0d AM |
18726 | + && au_ibtop(inode) <= bindex |
18727 | + && bindex <= au_ibbot(inode)) { | |
4a4d8108 AM |
18728 | + /* |
18729 | + * permission check is unnecessary since vfsub routine | |
18730 | + * will be called later | |
18731 | + */ | |
076b876e | 18732 | + hi = au_h_iptr(inode, bindex); |
4a4d8108 AM |
18733 | + if (hi) |
18734 | + err = IS_IMMUTABLE(hi) ? -EROFS : 0; | |
1facf9fc | 18735 | + } |
18736 | + | |
4a4d8108 AM |
18737 | + return err; |
18738 | +} | |
dece6358 | 18739 | + |
4a4d8108 AM |
18740 | +int au_test_h_perm(struct inode *h_inode, int mask) |
18741 | +{ | |
2dfbb274 | 18742 | + if (uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) |
4a4d8108 AM |
18743 | + return 0; |
18744 | + return inode_permission(h_inode, mask); | |
18745 | +} | |
1facf9fc | 18746 | + |
4a4d8108 AM |
18747 | +int au_test_h_perm_sio(struct inode *h_inode, int mask) |
18748 | +{ | |
18749 | + if (au_test_nfs(h_inode->i_sb) | |
18750 | + && (mask & MAY_WRITE) | |
18751 | + && S_ISDIR(h_inode->i_mode)) | |
18752 | + mask |= MAY_READ; /* force permission check */ | |
18753 | + return au_test_h_perm(h_inode, mask); | |
1facf9fc | 18754 | +} |
7f207e10 AM |
18755 | diff -urN /usr/share/empty/fs/aufs/inode.h linux/fs/aufs/inode.h |
18756 | --- /usr/share/empty/fs/aufs/inode.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 18757 | +++ linux/fs/aufs/inode.h 2018-08-12 23:43:05.460124736 +0200 |
062440b3 AM |
18758 | @@ -0,0 +1,696 @@ |
18759 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
4a4d8108 | 18760 | +/* |
b00004a5 | 18761 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
18762 | + * |
18763 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18764 | + * it under the terms of the GNU General Public License as published by | |
18765 | + * the Free Software Foundation; either version 2 of the License, or | |
18766 | + * (at your option) any later version. | |
18767 | + * | |
18768 | + * This program is distributed in the hope that it will be useful, | |
18769 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18770 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18771 | + * GNU General Public License for more details. | |
18772 | + * | |
18773 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 18774 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 18775 | + */ |
1facf9fc | 18776 | + |
1308ab2a | 18777 | +/* |
4a4d8108 | 18778 | + * inode operations |
1308ab2a | 18779 | + */ |
dece6358 | 18780 | + |
4a4d8108 AM |
18781 | +#ifndef __AUFS_INODE_H__ |
18782 | +#define __AUFS_INODE_H__ | |
dece6358 | 18783 | + |
4a4d8108 | 18784 | +#ifdef __KERNEL__ |
1308ab2a | 18785 | + |
4a4d8108 | 18786 | +#include <linux/fsnotify.h> |
4a4d8108 | 18787 | +#include "rwsem.h" |
1308ab2a | 18788 | + |
4a4d8108 | 18789 | +struct vfsmount; |
1facf9fc | 18790 | + |
4a4d8108 AM |
18791 | +struct au_hnotify { |
18792 | +#ifdef CONFIG_AUFS_HNOTIFY | |
18793 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
7f207e10 | 18794 | + /* never use fsnotify_add_vfsmount_mark() */ |
0c5527e5 | 18795 | + struct fsnotify_mark hn_mark; |
4a4d8108 | 18796 | +#endif |
1c60b727 | 18797 | + struct inode *hn_aufs_inode; /* no get/put */ |
4a4d8108 AM |
18798 | +#endif |
18799 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 18800 | + |
4a4d8108 AM |
18801 | +struct au_hinode { |
18802 | + struct inode *hi_inode; | |
18803 | + aufs_bindex_t hi_id; | |
18804 | +#ifdef CONFIG_AUFS_HNOTIFY | |
18805 | + struct au_hnotify *hi_notify; | |
18806 | +#endif | |
dece6358 | 18807 | + |
4a4d8108 AM |
18808 | + /* reference to the copied-up whiteout with get/put */ |
18809 | + struct dentry *hi_whdentry; | |
18810 | +}; | |
dece6358 | 18811 | + |
537831f9 AM |
18812 | +/* ig_flags */ |
18813 | +#define AuIG_HALF_REFRESHED 1 | |
18814 | +#define au_ig_ftest(flags, name) ((flags) & AuIG_##name) | |
18815 | +#define au_ig_fset(flags, name) \ | |
18816 | + do { (flags) |= AuIG_##name; } while (0) | |
18817 | +#define au_ig_fclr(flags, name) \ | |
18818 | + do { (flags) &= ~AuIG_##name; } while (0) | |
18819 | + | |
18820 | +struct au_iigen { | |
be52b249 | 18821 | + spinlock_t ig_spin; |
537831f9 AM |
18822 | + __u32 ig_generation, ig_flags; |
18823 | +}; | |
18824 | + | |
4a4d8108 AM |
18825 | +struct au_vdir; |
18826 | +struct au_iinfo { | |
7a9e40b8 | 18827 | + struct au_iigen ii_generation; |
4a4d8108 | 18828 | + struct super_block *ii_hsb1; /* no get/put */ |
1facf9fc | 18829 | + |
4a4d8108 | 18830 | + struct au_rwsem ii_rwsem; |
5afbbe0d | 18831 | + aufs_bindex_t ii_btop, ii_bbot; |
4a4d8108 AM |
18832 | + __u32 ii_higen; |
18833 | + struct au_hinode *ii_hinode; | |
18834 | + struct au_vdir *ii_vdir; | |
18835 | +}; | |
1facf9fc | 18836 | + |
4a4d8108 AM |
18837 | +struct au_icntnr { |
18838 | + struct au_iinfo iinfo; | |
18839 | + struct inode vfs_inode; | |
8b6a4947 | 18840 | + struct hlist_bl_node plink; |
4a4d8108 | 18841 | +} ____cacheline_aligned_in_smp; |
1308ab2a | 18842 | + |
4a4d8108 AM |
18843 | +/* au_pin flags */ |
18844 | +#define AuPin_DI_LOCKED 1 | |
18845 | +#define AuPin_MNT_WRITE (1 << 1) | |
18846 | +#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) | |
7f207e10 AM |
18847 | +#define au_fset_pin(flags, name) \ |
18848 | + do { (flags) |= AuPin_##name; } while (0) | |
18849 | +#define au_fclr_pin(flags, name) \ | |
18850 | + do { (flags) &= ~AuPin_##name; } while (0) | |
4a4d8108 AM |
18851 | + |
18852 | +struct au_pin { | |
18853 | + /* input */ | |
18854 | + struct dentry *dentry; | |
18855 | + unsigned int udba; | |
18856 | + unsigned char lsc_di, lsc_hi, flags; | |
18857 | + aufs_bindex_t bindex; | |
18858 | + | |
18859 | + /* output */ | |
18860 | + struct dentry *parent; | |
18861 | + struct au_hinode *hdir; | |
18862 | + struct vfsmount *h_mnt; | |
86dc4139 AM |
18863 | + |
18864 | + /* temporary unlock/relock for copyup */ | |
18865 | + struct dentry *h_dentry, *h_parent; | |
18866 | + struct au_branch *br; | |
18867 | + struct task_struct *task; | |
4a4d8108 | 18868 | +}; |
1facf9fc | 18869 | + |
86dc4139 | 18870 | +void au_pin_hdir_unlock(struct au_pin *p); |
c1595e42 | 18871 | +int au_pin_hdir_lock(struct au_pin *p); |
86dc4139 | 18872 | +int au_pin_hdir_relock(struct au_pin *p); |
86dc4139 AM |
18873 | +void au_pin_hdir_acquire_nest(struct au_pin *p); |
18874 | +void au_pin_hdir_release(struct au_pin *p); | |
18875 | + | |
1308ab2a | 18876 | +/* ---------------------------------------------------------------------- */ |
18877 | + | |
4a4d8108 | 18878 | +static inline struct au_iinfo *au_ii(struct inode *inode) |
1facf9fc | 18879 | +{ |
5afbbe0d AM |
18880 | + BUG_ON(is_bad_inode(inode)); |
18881 | + return &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
4a4d8108 | 18882 | +} |
1facf9fc | 18883 | + |
4a4d8108 | 18884 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 18885 | + |
4a4d8108 AM |
18886 | +/* inode.c */ |
18887 | +struct inode *au_igrab(struct inode *inode); | |
b95c5147 | 18888 | +void au_refresh_iop(struct inode *inode, int force_getattr); |
027c5e7a | 18889 | +int au_refresh_hinode_self(struct inode *inode); |
4a4d8108 AM |
18890 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry); |
18891 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
18892 | + unsigned int d_type, ino_t *ino); | |
18893 | +struct inode *au_new_inode(struct dentry *dentry, int must_new); | |
18894 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, | |
18895 | + struct inode *inode); | |
18896 | +int au_test_h_perm(struct inode *h_inode, int mask); | |
18897 | +int au_test_h_perm_sio(struct inode *h_inode, int mask); | |
1facf9fc | 18898 | + |
4a4d8108 AM |
18899 | +static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, |
18900 | + ino_t h_ino, unsigned int d_type, ino_t *ino) | |
18901 | +{ | |
18902 | +#ifdef CONFIG_AUFS_SHWH | |
18903 | + return au_ino(sb, bindex, h_ino, d_type, ino); | |
18904 | +#else | |
18905 | + return 0; | |
18906 | +#endif | |
18907 | +} | |
1facf9fc | 18908 | + |
4a4d8108 | 18909 | +/* i_op.c */ |
b95c5147 AM |
18910 | +enum { |
18911 | + AuIop_SYMLINK, | |
18912 | + AuIop_DIR, | |
18913 | + AuIop_OTHER, | |
18914 | + AuIop_Last | |
18915 | +}; | |
18916 | +extern struct inode_operations aufs_iop[AuIop_Last], | |
18917 | + aufs_iop_nogetattr[AuIop_Last]; | |
1308ab2a | 18918 | + |
4a4d8108 AM |
18919 | +/* au_wr_dir flags */ |
18920 | +#define AuWrDir_ADD_ENTRY 1 | |
7e9cd9fe AM |
18921 | +#define AuWrDir_ISDIR (1 << 1) |
18922 | +#define AuWrDir_TMPFILE (1 << 2) | |
4a4d8108 | 18923 | +#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) |
7f207e10 AM |
18924 | +#define au_fset_wrdir(flags, name) \ |
18925 | + do { (flags) |= AuWrDir_##name; } while (0) | |
18926 | +#define au_fclr_wrdir(flags, name) \ | |
18927 | + do { (flags) &= ~AuWrDir_##name; } while (0) | |
1facf9fc | 18928 | + |
4a4d8108 AM |
18929 | +struct au_wr_dir_args { |
18930 | + aufs_bindex_t force_btgt; | |
18931 | + unsigned char flags; | |
18932 | +}; | |
18933 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
18934 | + struct au_wr_dir_args *args); | |
dece6358 | 18935 | + |
4a4d8108 AM |
18936 | +struct dentry *au_pinned_h_parent(struct au_pin *pin); |
18937 | +void au_pin_init(struct au_pin *pin, struct dentry *dentry, | |
18938 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
18939 | + unsigned int udba, unsigned char flags); | |
18940 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
18941 | + unsigned int udba, unsigned char flags) __must_check; | |
18942 | +int au_do_pin(struct au_pin *pin) __must_check; | |
18943 | +void au_unpin(struct au_pin *pin); | |
c1595e42 JR |
18944 | +int au_reval_for_attr(struct dentry *dentry, unsigned int sigen); |
18945 | + | |
18946 | +#define AuIcpup_DID_CPUP 1 | |
18947 | +#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) | |
18948 | +#define au_fset_icpup(flags, name) \ | |
18949 | + do { (flags) |= AuIcpup_##name; } while (0) | |
18950 | +#define au_fclr_icpup(flags, name) \ | |
18951 | + do { (flags) &= ~AuIcpup_##name; } while (0) | |
18952 | + | |
18953 | +struct au_icpup_args { | |
18954 | + unsigned char flags; | |
18955 | + unsigned char pin_flags; | |
18956 | + aufs_bindex_t btgt; | |
18957 | + unsigned int udba; | |
18958 | + struct au_pin pin; | |
18959 | + struct path h_path; | |
18960 | + struct inode *h_inode; | |
18961 | +}; | |
18962 | + | |
18963 | +int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, | |
18964 | + struct au_icpup_args *a); | |
18965 | + | |
a2654f78 AM |
18966 | +int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, |
18967 | + int locked); | |
1facf9fc | 18968 | + |
4a4d8108 AM |
18969 | +/* i_op_add.c */ |
18970 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
18971 | + struct dentry *h_parent, int isdir); | |
7eafdf33 AM |
18972 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
18973 | + dev_t dev); | |
4a4d8108 | 18974 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); |
7eafdf33 | 18975 | +int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
b4510431 | 18976 | + bool want_excl); |
b912730e AM |
18977 | +struct vfsub_aopen_args; |
18978 | +int au_aopen_or_create(struct inode *dir, struct dentry *dentry, | |
18979 | + struct vfsub_aopen_args *args); | |
38d290e6 | 18980 | +int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode); |
4a4d8108 AM |
18981 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, |
18982 | + struct dentry *dentry); | |
7eafdf33 | 18983 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode); |
1facf9fc | 18984 | + |
4a4d8108 AM |
18985 | +/* i_op_del.c */ |
18986 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); | |
18987 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
18988 | + struct dentry *h_parent, int isdir); | |
18989 | +int aufs_unlink(struct inode *dir, struct dentry *dentry); | |
18990 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry); | |
1308ab2a | 18991 | + |
4a4d8108 AM |
18992 | +/* i_op_ren.c */ |
18993 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); | |
18994 | +int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, | |
f2c43d5f AM |
18995 | + struct inode *dir, struct dentry *dentry, |
18996 | + unsigned int flags); | |
1facf9fc | 18997 | + |
4a4d8108 AM |
18998 | +/* iinfo.c */ |
18999 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); | |
19000 | +void au_hiput(struct au_hinode *hinode); | |
19001 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, | |
19002 | + struct dentry *h_wh); | |
19003 | +unsigned int au_hi_flags(struct inode *inode, int isdir); | |
1308ab2a | 19004 | + |
4a4d8108 AM |
19005 | +/* hinode flags */ |
19006 | +#define AuHi_XINO 1 | |
19007 | +#define AuHi_HNOTIFY (1 << 1) | |
19008 | +#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) | |
7f207e10 AM |
19009 | +#define au_fset_hi(flags, name) \ |
19010 | + do { (flags) |= AuHi_##name; } while (0) | |
19011 | +#define au_fclr_hi(flags, name) \ | |
19012 | + do { (flags) &= ~AuHi_##name; } while (0) | |
1facf9fc | 19013 | + |
4a4d8108 AM |
19014 | +#ifndef CONFIG_AUFS_HNOTIFY |
19015 | +#undef AuHi_HNOTIFY | |
19016 | +#define AuHi_HNOTIFY 0 | |
19017 | +#endif | |
1facf9fc | 19018 | + |
4a4d8108 AM |
19019 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
19020 | + struct inode *h_inode, unsigned int flags); | |
1facf9fc | 19021 | + |
537831f9 | 19022 | +void au_update_iigen(struct inode *inode, int half); |
4a4d8108 | 19023 | +void au_update_ibrange(struct inode *inode, int do_put_zero); |
1facf9fc | 19024 | + |
4a4d8108 | 19025 | +void au_icntnr_init_once(void *_c); |
5afbbe0d | 19026 | +void au_hinode_init(struct au_hinode *hinode); |
4a4d8108 AM |
19027 | +int au_iinfo_init(struct inode *inode); |
19028 | +void au_iinfo_fin(struct inode *inode); | |
e2f27e51 | 19029 | +int au_hinode_realloc(struct au_iinfo *iinfo, int nbr, int may_shrink); |
1308ab2a | 19030 | + |
e49829fe | 19031 | +#ifdef CONFIG_PROC_FS |
4a4d8108 | 19032 | +/* plink.c */ |
e49829fe | 19033 | +int au_plink_maint(struct super_block *sb, int flags); |
7e9cd9fe | 19034 | +struct au_sbinfo; |
e49829fe JR |
19035 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo); |
19036 | +int au_plink_maint_enter(struct super_block *sb); | |
4a4d8108 AM |
19037 | +#ifdef CONFIG_AUFS_DEBUG |
19038 | +void au_plink_list(struct super_block *sb); | |
19039 | +#else | |
19040 | +AuStubVoid(au_plink_list, struct super_block *sb) | |
19041 | +#endif | |
19042 | +int au_plink_test(struct inode *inode); | |
19043 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); | |
19044 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
19045 | + struct dentry *h_dentry); | |
e49829fe JR |
19046 | +void au_plink_put(struct super_block *sb, int verbose); |
19047 | +void au_plink_clean(struct super_block *sb, int verbose); | |
4a4d8108 | 19048 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); |
e49829fe JR |
19049 | +#else |
19050 | +AuStubInt0(au_plink_maint, struct super_block *sb, int flags); | |
19051 | +AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo); | |
19052 | +AuStubInt0(au_plink_maint_enter, struct super_block *sb); | |
19053 | +AuStubVoid(au_plink_list, struct super_block *sb); | |
19054 | +AuStubInt0(au_plink_test, struct inode *inode); | |
19055 | +AuStub(struct dentry *, au_plink_lkup, return NULL, | |
19056 | + struct inode *inode, aufs_bindex_t bindex); | |
19057 | +AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex, | |
19058 | + struct dentry *h_dentry); | |
19059 | +AuStubVoid(au_plink_put, struct super_block *sb, int verbose); | |
19060 | +AuStubVoid(au_plink_clean, struct super_block *sb, int verbose); | |
19061 | +AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id); | |
19062 | +#endif /* CONFIG_PROC_FS */ | |
1facf9fc | 19063 | + |
c1595e42 JR |
19064 | +#ifdef CONFIG_AUFS_XATTR |
19065 | +/* xattr.c */ | |
7e9cd9fe AM |
19066 | +int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, |
19067 | + unsigned int verbose); | |
c1595e42 | 19068 | +ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size); |
f2c43d5f | 19069 | +void au_xattr_init(struct super_block *sb); |
c1595e42 JR |
19070 | +#else |
19071 | +AuStubInt0(au_cpup_xattr, struct dentry *h_dst, struct dentry *h_src, | |
7e9cd9fe | 19072 | + int ignore_flags, unsigned int verbose); |
f2c43d5f | 19073 | +AuStubVoid(au_xattr_init, struct super_block *sb); |
c1595e42 JR |
19074 | +#endif |
19075 | + | |
19076 | +#ifdef CONFIG_FS_POSIX_ACL | |
19077 | +struct posix_acl *aufs_get_acl(struct inode *inode, int type); | |
19078 | +int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type); | |
19079 | +#endif | |
19080 | + | |
19081 | +#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) | |
19082 | +enum { | |
19083 | + AU_XATTR_SET, | |
c1595e42 JR |
19084 | + AU_ACL_SET |
19085 | +}; | |
19086 | + | |
f2c43d5f | 19087 | +struct au_sxattr { |
c1595e42 JR |
19088 | + int type; |
19089 | + union { | |
19090 | + struct { | |
19091 | + const char *name; | |
19092 | + const void *value; | |
19093 | + size_t size; | |
19094 | + int flags; | |
19095 | + } set; | |
19096 | + struct { | |
c1595e42 JR |
19097 | + struct posix_acl *acl; |
19098 | + int type; | |
19099 | + } acl_set; | |
19100 | + } u; | |
19101 | +}; | |
f2c43d5f AM |
19102 | +ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, |
19103 | + struct au_sxattr *arg); | |
c1595e42 JR |
19104 | +#endif |
19105 | + | |
4a4d8108 | 19106 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19107 | + |
4a4d8108 AM |
19108 | +/* lock subclass for iinfo */ |
19109 | +enum { | |
19110 | + AuLsc_II_CHILD, /* child first */ | |
19111 | + AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ | |
19112 | + AuLsc_II_CHILD3, /* copyup dirs */ | |
19113 | + AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ | |
19114 | + AuLsc_II_PARENT2, | |
19115 | + AuLsc_II_PARENT3, /* copyup dirs */ | |
19116 | + AuLsc_II_NEW_CHILD | |
19117 | +}; | |
1308ab2a | 19118 | + |
1facf9fc | 19119 | +/* |
4a4d8108 AM |
19120 | + * ii_read_lock_child, ii_write_lock_child, |
19121 | + * ii_read_lock_child2, ii_write_lock_child2, | |
19122 | + * ii_read_lock_child3, ii_write_lock_child3, | |
19123 | + * ii_read_lock_parent, ii_write_lock_parent, | |
19124 | + * ii_read_lock_parent2, ii_write_lock_parent2, | |
19125 | + * ii_read_lock_parent3, ii_write_lock_parent3, | |
19126 | + * ii_read_lock_new_child, ii_write_lock_new_child, | |
1facf9fc | 19127 | + */ |
4a4d8108 AM |
19128 | +#define AuReadLockFunc(name, lsc) \ |
19129 | +static inline void ii_read_lock_##name(struct inode *i) \ | |
19130 | +{ \ | |
19131 | + au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
19132 | +} | |
19133 | + | |
19134 | +#define AuWriteLockFunc(name, lsc) \ | |
19135 | +static inline void ii_write_lock_##name(struct inode *i) \ | |
19136 | +{ \ | |
19137 | + au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
19138 | +} | |
19139 | + | |
19140 | +#define AuRWLockFuncs(name, lsc) \ | |
19141 | + AuReadLockFunc(name, lsc) \ | |
19142 | + AuWriteLockFunc(name, lsc) | |
19143 | + | |
19144 | +AuRWLockFuncs(child, CHILD); | |
19145 | +AuRWLockFuncs(child2, CHILD2); | |
19146 | +AuRWLockFuncs(child3, CHILD3); | |
19147 | +AuRWLockFuncs(parent, PARENT); | |
19148 | +AuRWLockFuncs(parent2, PARENT2); | |
19149 | +AuRWLockFuncs(parent3, PARENT3); | |
19150 | +AuRWLockFuncs(new_child, NEW_CHILD); | |
19151 | + | |
19152 | +#undef AuReadLockFunc | |
19153 | +#undef AuWriteLockFunc | |
19154 | +#undef AuRWLockFuncs | |
1facf9fc | 19155 | + |
8b6a4947 AM |
19156 | +#define ii_read_unlock(i) au_rw_read_unlock(&au_ii(i)->ii_rwsem) |
19157 | +#define ii_write_unlock(i) au_rw_write_unlock(&au_ii(i)->ii_rwsem) | |
19158 | +#define ii_downgrade_lock(i) au_rw_dgrade_lock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 19159 | + |
4a4d8108 AM |
19160 | +#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) |
19161 | +#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) | |
19162 | +#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 19163 | + |
4a4d8108 | 19164 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19165 | + |
027c5e7a AM |
19166 | +static inline void au_icntnr_init(struct au_icntnr *c) |
19167 | +{ | |
19168 | +#ifdef CONFIG_AUFS_DEBUG | |
19169 | + c->vfs_inode.i_mode = 0; | |
19170 | +#endif | |
19171 | +} | |
19172 | + | |
cfc41e69 | 19173 | +static inline unsigned int au_iigen(struct inode *inode, unsigned int *igflags) |
4a4d8108 | 19174 | +{ |
537831f9 AM |
19175 | + unsigned int gen; |
19176 | + struct au_iinfo *iinfo; | |
be52b249 | 19177 | + struct au_iigen *iigen; |
537831f9 AM |
19178 | + |
19179 | + iinfo = au_ii(inode); | |
be52b249 AM |
19180 | + iigen = &iinfo->ii_generation; |
19181 | + spin_lock(&iigen->ig_spin); | |
cfc41e69 AM |
19182 | + if (igflags) |
19183 | + *igflags = iigen->ig_flags; | |
be52b249 AM |
19184 | + gen = iigen->ig_generation; |
19185 | + spin_unlock(&iigen->ig_spin); | |
537831f9 AM |
19186 | + |
19187 | + return gen; | |
4a4d8108 | 19188 | +} |
1308ab2a | 19189 | + |
4a4d8108 AM |
19190 | +/* tiny test for inode number */ |
19191 | +/* tmpfs generation is too rough */ | |
19192 | +static inline int au_test_higen(struct inode *inode, struct inode *h_inode) | |
19193 | +{ | |
19194 | + struct au_iinfo *iinfo; | |
1308ab2a | 19195 | + |
4a4d8108 AM |
19196 | + iinfo = au_ii(inode); |
19197 | + AuRwMustAnyLock(&iinfo->ii_rwsem); | |
19198 | + return !(iinfo->ii_hsb1 == h_inode->i_sb | |
19199 | + && iinfo->ii_higen == h_inode->i_generation); | |
19200 | +} | |
1308ab2a | 19201 | + |
4a4d8108 AM |
19202 | +static inline void au_iigen_dec(struct inode *inode) |
19203 | +{ | |
537831f9 | 19204 | + struct au_iinfo *iinfo; |
be52b249 | 19205 | + struct au_iigen *iigen; |
537831f9 AM |
19206 | + |
19207 | + iinfo = au_ii(inode); | |
be52b249 AM |
19208 | + iigen = &iinfo->ii_generation; |
19209 | + spin_lock(&iigen->ig_spin); | |
19210 | + iigen->ig_generation--; | |
19211 | + spin_unlock(&iigen->ig_spin); | |
027c5e7a AM |
19212 | +} |
19213 | + | |
19214 | +static inline int au_iigen_test(struct inode *inode, unsigned int sigen) | |
19215 | +{ | |
19216 | + int err; | |
19217 | + | |
19218 | + err = 0; | |
537831f9 | 19219 | + if (unlikely(inode && au_iigen(inode, NULL) != sigen)) |
027c5e7a AM |
19220 | + err = -EIO; |
19221 | + | |
19222 | + return err; | |
4a4d8108 | 19223 | +} |
1308ab2a | 19224 | + |
4a4d8108 | 19225 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 19226 | + |
5afbbe0d AM |
19227 | +static inline struct au_hinode *au_hinode(struct au_iinfo *iinfo, |
19228 | + aufs_bindex_t bindex) | |
19229 | +{ | |
19230 | + return iinfo->ii_hinode + bindex; | |
19231 | +} | |
19232 | + | |
19233 | +static inline int au_is_bad_inode(struct inode *inode) | |
19234 | +{ | |
19235 | + return !!(is_bad_inode(inode) || !au_hinode(au_ii(inode), 0)); | |
19236 | +} | |
19237 | + | |
4a4d8108 AM |
19238 | +static inline aufs_bindex_t au_ii_br_id(struct inode *inode, |
19239 | + aufs_bindex_t bindex) | |
19240 | +{ | |
19241 | + IiMustAnyLock(inode); | |
5afbbe0d | 19242 | + return au_hinode(au_ii(inode), bindex)->hi_id; |
4a4d8108 | 19243 | +} |
1308ab2a | 19244 | + |
5afbbe0d | 19245 | +static inline aufs_bindex_t au_ibtop(struct inode *inode) |
4a4d8108 AM |
19246 | +{ |
19247 | + IiMustAnyLock(inode); | |
5afbbe0d | 19248 | + return au_ii(inode)->ii_btop; |
4a4d8108 | 19249 | +} |
1308ab2a | 19250 | + |
5afbbe0d | 19251 | +static inline aufs_bindex_t au_ibbot(struct inode *inode) |
4a4d8108 AM |
19252 | +{ |
19253 | + IiMustAnyLock(inode); | |
5afbbe0d | 19254 | + return au_ii(inode)->ii_bbot; |
4a4d8108 | 19255 | +} |
1308ab2a | 19256 | + |
4a4d8108 AM |
19257 | +static inline struct au_vdir *au_ivdir(struct inode *inode) |
19258 | +{ | |
19259 | + IiMustAnyLock(inode); | |
19260 | + return au_ii(inode)->ii_vdir; | |
19261 | +} | |
1308ab2a | 19262 | + |
4a4d8108 AM |
19263 | +static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) |
19264 | +{ | |
19265 | + IiMustAnyLock(inode); | |
5afbbe0d | 19266 | + return au_hinode(au_ii(inode), bindex)->hi_whdentry; |
4a4d8108 | 19267 | +} |
1308ab2a | 19268 | + |
5afbbe0d | 19269 | +static inline void au_set_ibtop(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 19270 | +{ |
4a4d8108 | 19271 | + IiMustWriteLock(inode); |
5afbbe0d | 19272 | + au_ii(inode)->ii_btop = bindex; |
4a4d8108 | 19273 | +} |
1308ab2a | 19274 | + |
5afbbe0d | 19275 | +static inline void au_set_ibbot(struct inode *inode, aufs_bindex_t bindex) |
4a4d8108 AM |
19276 | +{ |
19277 | + IiMustWriteLock(inode); | |
5afbbe0d | 19278 | + au_ii(inode)->ii_bbot = bindex; |
1308ab2a | 19279 | +} |
19280 | + | |
4a4d8108 AM |
19281 | +static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) |
19282 | +{ | |
19283 | + IiMustWriteLock(inode); | |
19284 | + au_ii(inode)->ii_vdir = vdir; | |
19285 | +} | |
1facf9fc | 19286 | + |
4a4d8108 | 19287 | +static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 19288 | +{ |
4a4d8108 | 19289 | + IiMustAnyLock(inode); |
5afbbe0d | 19290 | + return au_hinode(au_ii(inode), bindex); |
4a4d8108 | 19291 | +} |
dece6358 | 19292 | + |
4a4d8108 | 19293 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 19294 | + |
4a4d8108 AM |
19295 | +static inline struct dentry *au_pinned_parent(struct au_pin *pin) |
19296 | +{ | |
19297 | + if (pin) | |
19298 | + return pin->parent; | |
19299 | + return NULL; | |
1facf9fc | 19300 | +} |
19301 | + | |
4a4d8108 | 19302 | +static inline struct inode *au_pinned_h_dir(struct au_pin *pin) |
1facf9fc | 19303 | +{ |
4a4d8108 AM |
19304 | + if (pin && pin->hdir) |
19305 | + return pin->hdir->hi_inode; | |
19306 | + return NULL; | |
1308ab2a | 19307 | +} |
1facf9fc | 19308 | + |
4a4d8108 AM |
19309 | +static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) |
19310 | +{ | |
19311 | + if (pin) | |
19312 | + return pin->hdir; | |
19313 | + return NULL; | |
19314 | +} | |
1facf9fc | 19315 | + |
4a4d8108 | 19316 | +static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) |
1308ab2a | 19317 | +{ |
4a4d8108 AM |
19318 | + if (pin) |
19319 | + pin->dentry = dentry; | |
19320 | +} | |
1308ab2a | 19321 | + |
4a4d8108 AM |
19322 | +static inline void au_pin_set_parent_lflag(struct au_pin *pin, |
19323 | + unsigned char lflag) | |
19324 | +{ | |
19325 | + if (pin) { | |
7f207e10 | 19326 | + if (lflag) |
4a4d8108 | 19327 | + au_fset_pin(pin->flags, DI_LOCKED); |
7f207e10 | 19328 | + else |
4a4d8108 | 19329 | + au_fclr_pin(pin->flags, DI_LOCKED); |
1308ab2a | 19330 | + } |
4a4d8108 AM |
19331 | +} |
19332 | + | |
7e9cd9fe | 19333 | +#if 0 /* reserved */ |
4a4d8108 AM |
19334 | +static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) |
19335 | +{ | |
19336 | + if (pin) { | |
19337 | + dput(pin->parent); | |
19338 | + pin->parent = dget(parent); | |
1facf9fc | 19339 | + } |
4a4d8108 | 19340 | +} |
7e9cd9fe | 19341 | +#endif |
1facf9fc | 19342 | + |
4a4d8108 AM |
19343 | +/* ---------------------------------------------------------------------- */ |
19344 | + | |
027c5e7a | 19345 | +struct au_branch; |
4a4d8108 AM |
19346 | +#ifdef CONFIG_AUFS_HNOTIFY |
19347 | +struct au_hnotify_op { | |
19348 | + void (*ctl)(struct au_hinode *hinode, int do_set); | |
027c5e7a | 19349 | + int (*alloc)(struct au_hinode *hinode); |
7eafdf33 AM |
19350 | + |
19351 | + /* | |
19352 | + * if it returns true, the the caller should free hinode->hi_notify, | |
19353 | + * otherwise ->free() frees it. | |
19354 | + */ | |
19355 | + int (*free)(struct au_hinode *hinode, | |
19356 | + struct au_hnotify *hn) __must_check; | |
4a4d8108 AM |
19357 | + |
19358 | + void (*fin)(void); | |
19359 | + int (*init)(void); | |
027c5e7a AM |
19360 | + |
19361 | + int (*reset_br)(unsigned int udba, struct au_branch *br, int perm); | |
19362 | + void (*fin_br)(struct au_branch *br); | |
19363 | + int (*init_br)(struct au_branch *br, int perm); | |
4a4d8108 AM |
19364 | +}; |
19365 | + | |
19366 | +/* hnotify.c */ | |
027c5e7a | 19367 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode); |
4a4d8108 AM |
19368 | +void au_hn_free(struct au_hinode *hinode); |
19369 | +void au_hn_ctl(struct au_hinode *hinode, int do_set); | |
19370 | +void au_hn_reset(struct inode *inode, unsigned int flags); | |
19371 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
19372 | + struct qstr *h_child_qstr, struct inode *h_child_inode); | |
027c5e7a AM |
19373 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm); |
19374 | +int au_hnotify_init_br(struct au_branch *br, int perm); | |
19375 | +void au_hnotify_fin_br(struct au_branch *br); | |
4a4d8108 AM |
19376 | +int __init au_hnotify_init(void); |
19377 | +void au_hnotify_fin(void); | |
19378 | + | |
7f207e10 | 19379 | +/* hfsnotify.c */ |
4a4d8108 AM |
19380 | +extern const struct au_hnotify_op au_hnotify_op; |
19381 | + | |
19382 | +static inline | |
19383 | +void au_hn_init(struct au_hinode *hinode) | |
19384 | +{ | |
19385 | + hinode->hi_notify = NULL; | |
1308ab2a | 19386 | +} |
19387 | + | |
53392da6 AM |
19388 | +static inline struct au_hnotify *au_hn(struct au_hinode *hinode) |
19389 | +{ | |
19390 | + return hinode->hi_notify; | |
19391 | +} | |
19392 | + | |
4a4d8108 | 19393 | +#else |
c1595e42 JR |
19394 | +AuStub(int, au_hn_alloc, return -EOPNOTSUPP, |
19395 | + struct au_hinode *hinode __maybe_unused, | |
19396 | + struct inode *inode __maybe_unused) | |
19397 | +AuStub(struct au_hnotify *, au_hn, return NULL, struct au_hinode *hinode) | |
4a4d8108 AM |
19398 | +AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) |
19399 | +AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, | |
19400 | + int do_set __maybe_unused) | |
19401 | +AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, | |
19402 | + unsigned int flags __maybe_unused) | |
027c5e7a AM |
19403 | +AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused, |
19404 | + struct au_branch *br __maybe_unused, | |
19405 | + int perm __maybe_unused) | |
19406 | +AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused, | |
19407 | + int perm __maybe_unused) | |
19408 | +AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused) | |
4a4d8108 AM |
19409 | +AuStubInt0(__init au_hnotify_init, void) |
19410 | +AuStubVoid(au_hnotify_fin, void) | |
19411 | +AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) | |
19412 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
19413 | + | |
19414 | +static inline void au_hn_suspend(struct au_hinode *hdir) | |
19415 | +{ | |
19416 | + au_hn_ctl(hdir, /*do_set*/0); | |
1308ab2a | 19417 | +} |
19418 | + | |
4a4d8108 | 19419 | +static inline void au_hn_resume(struct au_hinode *hdir) |
1308ab2a | 19420 | +{ |
4a4d8108 AM |
19421 | + au_hn_ctl(hdir, /*do_set*/1); |
19422 | +} | |
1308ab2a | 19423 | + |
5afbbe0d | 19424 | +static inline void au_hn_inode_lock(struct au_hinode *hdir) |
4a4d8108 | 19425 | +{ |
febd17d6 | 19426 | + inode_lock(hdir->hi_inode); |
4a4d8108 AM |
19427 | + au_hn_suspend(hdir); |
19428 | +} | |
dece6358 | 19429 | + |
5afbbe0d | 19430 | +static inline void au_hn_inode_lock_nested(struct au_hinode *hdir, |
4a4d8108 AM |
19431 | + unsigned int sc __maybe_unused) |
19432 | +{ | |
febd17d6 | 19433 | + inode_lock_nested(hdir->hi_inode, sc); |
4a4d8108 | 19434 | + au_hn_suspend(hdir); |
1facf9fc | 19435 | +} |
1facf9fc | 19436 | + |
8b6a4947 AM |
19437 | +#if 0 /* unused */ |
19438 | +#include "vfsub.h" | |
3c1bdaff AM |
19439 | +static inline void au_hn_inode_lock_shared_nested(struct au_hinode *hdir, |
19440 | + unsigned int sc) | |
19441 | +{ | |
be118d29 | 19442 | + inode_lock_shared_nested(hdir->hi_inode, sc); |
3c1bdaff AM |
19443 | + au_hn_suspend(hdir); |
19444 | +} | |
8b6a4947 | 19445 | +#endif |
3c1bdaff | 19446 | + |
5afbbe0d | 19447 | +static inline void au_hn_inode_unlock(struct au_hinode *hdir) |
4a4d8108 AM |
19448 | +{ |
19449 | + au_hn_resume(hdir); | |
febd17d6 | 19450 | + inode_unlock(hdir->hi_inode); |
4a4d8108 AM |
19451 | +} |
19452 | + | |
19453 | +#endif /* __KERNEL__ */ | |
19454 | +#endif /* __AUFS_INODE_H__ */ | |
7f207e10 AM |
19455 | diff -urN /usr/share/empty/fs/aufs/ioctl.c linux/fs/aufs/ioctl.c |
19456 | --- /usr/share/empty/fs/aufs/ioctl.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 19457 | +++ linux/fs/aufs/ioctl.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 19458 | @@ -0,0 +1,220 @@ |
cd7a4cd9 | 19459 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 19460 | +/* |
b00004a5 | 19461 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
19462 | + * |
19463 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19464 | + * it under the terms of the GNU General Public License as published by | |
19465 | + * the Free Software Foundation; either version 2 of the License, or | |
19466 | + * (at your option) any later version. | |
19467 | + * | |
19468 | + * This program is distributed in the hope that it will be useful, | |
19469 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19470 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19471 | + * GNU General Public License for more details. | |
19472 | + * | |
19473 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 19474 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
19475 | + */ |
19476 | + | |
19477 | +/* | |
19478 | + * ioctl | |
19479 | + * plink-management and readdir in userspace. | |
19480 | + * assist the pathconf(3) wrapper library. | |
c2b27bf2 | 19481 | + * move-down |
076b876e | 19482 | + * File-based Hierarchical Storage Management. |
4a4d8108 AM |
19483 | + */ |
19484 | + | |
c2b27bf2 AM |
19485 | +#include <linux/compat.h> |
19486 | +#include <linux/file.h> | |
4a4d8108 AM |
19487 | +#include "aufs.h" |
19488 | + | |
1e00d052 | 19489 | +static int au_wbr_fd(struct path *path, struct aufs_wbr_fd __user *arg) |
4a4d8108 AM |
19490 | +{ |
19491 | + int err, fd; | |
5afbbe0d | 19492 | + aufs_bindex_t wbi, bindex, bbot; |
4a4d8108 AM |
19493 | + struct file *h_file; |
19494 | + struct super_block *sb; | |
19495 | + struct dentry *root; | |
1e00d052 AM |
19496 | + struct au_branch *br; |
19497 | + struct aufs_wbr_fd wbrfd = { | |
19498 | + .oflags = au_dir_roflags, | |
19499 | + .brid = -1 | |
19500 | + }; | |
19501 | + const int valid = O_RDONLY | O_NONBLOCK | O_LARGEFILE | O_DIRECTORY | |
19502 | + | O_NOATIME | O_CLOEXEC; | |
4a4d8108 | 19503 | + |
1e00d052 AM |
19504 | + AuDebugOn(wbrfd.oflags & ~valid); |
19505 | + | |
19506 | + if (arg) { | |
19507 | + err = copy_from_user(&wbrfd, arg, sizeof(wbrfd)); | |
19508 | + if (unlikely(err)) { | |
19509 | + err = -EFAULT; | |
19510 | + goto out; | |
19511 | + } | |
19512 | + | |
19513 | + err = -EINVAL; | |
19514 | + AuDbg("wbrfd{0%o, %d}\n", wbrfd.oflags, wbrfd.brid); | |
19515 | + wbrfd.oflags |= au_dir_roflags; | |
19516 | + AuDbg("0%o\n", wbrfd.oflags); | |
19517 | + if (unlikely(wbrfd.oflags & ~valid)) | |
19518 | + goto out; | |
19519 | + } | |
19520 | + | |
2000de60 | 19521 | + fd = get_unused_fd_flags(0); |
1e00d052 AM |
19522 | + err = fd; |
19523 | + if (unlikely(fd < 0)) | |
4a4d8108 | 19524 | + goto out; |
4a4d8108 | 19525 | + |
1e00d052 | 19526 | + h_file = ERR_PTR(-EINVAL); |
4a4d8108 | 19527 | + wbi = 0; |
1e00d052 | 19528 | + br = NULL; |
4a4d8108 AM |
19529 | + sb = path->dentry->d_sb; |
19530 | + root = sb->s_root; | |
19531 | + aufs_read_lock(root, AuLock_IR); | |
5afbbe0d | 19532 | + bbot = au_sbbot(sb); |
1e00d052 AM |
19533 | + if (wbrfd.brid >= 0) { |
19534 | + wbi = au_br_index(sb, wbrfd.brid); | |
5afbbe0d | 19535 | + if (unlikely(wbi < 0 || wbi > bbot)) |
1e00d052 AM |
19536 | + goto out_unlock; |
19537 | + } | |
19538 | + | |
19539 | + h_file = ERR_PTR(-ENOENT); | |
19540 | + br = au_sbr(sb, wbi); | |
19541 | + if (!au_br_writable(br->br_perm)) { | |
19542 | + if (arg) | |
19543 | + goto out_unlock; | |
19544 | + | |
19545 | + bindex = wbi + 1; | |
19546 | + wbi = -1; | |
5afbbe0d | 19547 | + for (; bindex <= bbot; bindex++) { |
1e00d052 AM |
19548 | + br = au_sbr(sb, bindex); |
19549 | + if (au_br_writable(br->br_perm)) { | |
4a4d8108 | 19550 | + wbi = bindex; |
1e00d052 | 19551 | + br = au_sbr(sb, wbi); |
4a4d8108 AM |
19552 | + break; |
19553 | + } | |
19554 | + } | |
4a4d8108 AM |
19555 | + } |
19556 | + AuDbg("wbi %d\n", wbi); | |
1e00d052 | 19557 | + if (wbi >= 0) |
392086de AM |
19558 | + h_file = au_h_open(root, wbi, wbrfd.oflags, NULL, |
19559 | + /*force_wr*/0); | |
1e00d052 AM |
19560 | + |
19561 | +out_unlock: | |
4a4d8108 AM |
19562 | + aufs_read_unlock(root, AuLock_IR); |
19563 | + err = PTR_ERR(h_file); | |
19564 | + if (IS_ERR(h_file)) | |
19565 | + goto out_fd; | |
19566 | + | |
5afbbe0d | 19567 | + au_br_put(br); /* cf. au_h_open() */ |
4a4d8108 AM |
19568 | + fd_install(fd, h_file); |
19569 | + err = fd; | |
19570 | + goto out; /* success */ | |
19571 | + | |
4f0767ce | 19572 | +out_fd: |
4a4d8108 | 19573 | + put_unused_fd(fd); |
4f0767ce | 19574 | +out: |
1e00d052 | 19575 | + AuTraceErr(err); |
4a4d8108 AM |
19576 | + return err; |
19577 | +} | |
19578 | + | |
19579 | +/* ---------------------------------------------------------------------- */ | |
19580 | + | |
19581 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) | |
19582 | +{ | |
19583 | + long err; | |
c1595e42 | 19584 | + struct dentry *dentry; |
4a4d8108 AM |
19585 | + |
19586 | + switch (cmd) { | |
4a4d8108 AM |
19587 | + case AUFS_CTL_RDU: |
19588 | + case AUFS_CTL_RDU_INO: | |
19589 | + err = au_rdu_ioctl(file, cmd, arg); | |
19590 | + break; | |
19591 | + | |
19592 | + case AUFS_CTL_WBR_FD: | |
1e00d052 | 19593 | + err = au_wbr_fd(&file->f_path, (void __user *)arg); |
4a4d8108 AM |
19594 | + break; |
19595 | + | |
027c5e7a AM |
19596 | + case AUFS_CTL_IBUSY: |
19597 | + err = au_ibusy_ioctl(file, arg); | |
19598 | + break; | |
19599 | + | |
076b876e AM |
19600 | + case AUFS_CTL_BRINFO: |
19601 | + err = au_brinfo_ioctl(file, arg); | |
19602 | + break; | |
19603 | + | |
19604 | + case AUFS_CTL_FHSM_FD: | |
2000de60 | 19605 | + dentry = file->f_path.dentry; |
c1595e42 JR |
19606 | + if (IS_ROOT(dentry)) |
19607 | + err = au_fhsm_fd(dentry->d_sb, arg); | |
19608 | + else | |
19609 | + err = -ENOTTY; | |
076b876e AM |
19610 | + break; |
19611 | + | |
4a4d8108 AM |
19612 | + default: |
19613 | + /* do not call the lower */ | |
19614 | + AuDbg("0x%x\n", cmd); | |
19615 | + err = -ENOTTY; | |
19616 | + } | |
19617 | + | |
19618 | + AuTraceErr(err); | |
19619 | + return err; | |
19620 | +} | |
19621 | + | |
19622 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) | |
19623 | +{ | |
19624 | + long err; | |
19625 | + | |
19626 | + switch (cmd) { | |
c2b27bf2 | 19627 | + case AUFS_CTL_MVDOWN: |
2000de60 | 19628 | + err = au_mvdown(file->f_path.dentry, (void __user *)arg); |
c2b27bf2 AM |
19629 | + break; |
19630 | + | |
4a4d8108 | 19631 | + case AUFS_CTL_WBR_FD: |
1e00d052 | 19632 | + err = au_wbr_fd(&file->f_path, (void __user *)arg); |
4a4d8108 AM |
19633 | + break; |
19634 | + | |
19635 | + default: | |
19636 | + /* do not call the lower */ | |
19637 | + AuDbg("0x%x\n", cmd); | |
19638 | + err = -ENOTTY; | |
19639 | + } | |
19640 | + | |
19641 | + AuTraceErr(err); | |
19642 | + return err; | |
19643 | +} | |
b752ccd1 AM |
19644 | + |
19645 | +#ifdef CONFIG_COMPAT | |
19646 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
19647 | + unsigned long arg) | |
19648 | +{ | |
19649 | + long err; | |
19650 | + | |
19651 | + switch (cmd) { | |
19652 | + case AUFS_CTL_RDU: | |
19653 | + case AUFS_CTL_RDU_INO: | |
19654 | + err = au_rdu_compat_ioctl(file, cmd, arg); | |
19655 | + break; | |
19656 | + | |
027c5e7a AM |
19657 | + case AUFS_CTL_IBUSY: |
19658 | + err = au_ibusy_compat_ioctl(file, arg); | |
19659 | + break; | |
19660 | + | |
076b876e AM |
19661 | + case AUFS_CTL_BRINFO: |
19662 | + err = au_brinfo_compat_ioctl(file, arg); | |
19663 | + break; | |
19664 | + | |
b752ccd1 AM |
19665 | + default: |
19666 | + err = aufs_ioctl_dir(file, cmd, arg); | |
19667 | + } | |
19668 | + | |
19669 | + AuTraceErr(err); | |
19670 | + return err; | |
19671 | +} | |
19672 | + | |
b752ccd1 AM |
19673 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, |
19674 | + unsigned long arg) | |
19675 | +{ | |
19676 | + return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); | |
19677 | +} | |
19678 | +#endif | |
7f207e10 AM |
19679 | diff -urN /usr/share/empty/fs/aufs/i_op_add.c linux/fs/aufs/i_op_add.c |
19680 | --- /usr/share/empty/fs/aufs/i_op_add.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 19681 | +++ linux/fs/aufs/i_op_add.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 19682 | @@ -0,0 +1,921 @@ |
cd7a4cd9 | 19683 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 19684 | +/* |
b00004a5 | 19685 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
19686 | + * |
19687 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19688 | + * it under the terms of the GNU General Public License as published by | |
19689 | + * the Free Software Foundation; either version 2 of the License, or | |
19690 | + * (at your option) any later version. | |
19691 | + * | |
19692 | + * This program is distributed in the hope that it will be useful, | |
19693 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19694 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19695 | + * GNU General Public License for more details. | |
19696 | + * | |
19697 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 19698 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 AM |
19699 | + */ |
19700 | + | |
19701 | +/* | |
19702 | + * inode operations (add entry) | |
19703 | + */ | |
19704 | + | |
19705 | +#include "aufs.h" | |
19706 | + | |
19707 | +/* | |
19708 | + * final procedure of adding a new entry, except link(2). | |
19709 | + * remove whiteout, instantiate, copyup the parent dir's times and size | |
19710 | + * and update version. | |
19711 | + * if it failed, re-create the removed whiteout. | |
19712 | + */ | |
19713 | +static int epilog(struct inode *dir, aufs_bindex_t bindex, | |
19714 | + struct dentry *wh_dentry, struct dentry *dentry) | |
19715 | +{ | |
19716 | + int err, rerr; | |
19717 | + aufs_bindex_t bwh; | |
19718 | + struct path h_path; | |
076b876e | 19719 | + struct super_block *sb; |
4a4d8108 AM |
19720 | + struct inode *inode, *h_dir; |
19721 | + struct dentry *wh; | |
19722 | + | |
19723 | + bwh = -1; | |
076b876e | 19724 | + sb = dir->i_sb; |
4a4d8108 | 19725 | + if (wh_dentry) { |
5527c038 | 19726 | + h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ |
4a4d8108 AM |
19727 | + IMustLock(h_dir); |
19728 | + AuDebugOn(au_h_iptr(dir, bindex) != h_dir); | |
19729 | + bwh = au_dbwh(dentry); | |
19730 | + h_path.dentry = wh_dentry; | |
076b876e | 19731 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
4a4d8108 AM |
19732 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, |
19733 | + dentry); | |
19734 | + if (unlikely(err)) | |
19735 | + goto out; | |
19736 | + } | |
19737 | + | |
19738 | + inode = au_new_inode(dentry, /*must_new*/1); | |
19739 | + if (!IS_ERR(inode)) { | |
19740 | + d_instantiate(dentry, inode); | |
5527c038 | 19741 | + dir = d_inode(dentry->d_parent); /* dir inode is locked */ |
4a4d8108 | 19742 | + IMustLock(dir); |
b912730e | 19743 | + au_dir_ts(dir, bindex); |
be118d29 | 19744 | + inode_inc_iversion(dir); |
076b876e | 19745 | + au_fhsm_wrote(sb, bindex, /*force*/0); |
4a4d8108 AM |
19746 | + return 0; /* success */ |
19747 | + } | |
19748 | + | |
19749 | + err = PTR_ERR(inode); | |
19750 | + if (!wh_dentry) | |
19751 | + goto out; | |
19752 | + | |
19753 | + /* revert */ | |
19754 | + /* dir inode is locked */ | |
19755 | + wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); | |
19756 | + rerr = PTR_ERR(wh); | |
19757 | + if (IS_ERR(wh)) { | |
523b37e3 AM |
19758 | + AuIOErr("%pd reverting whiteout failed(%d, %d)\n", |
19759 | + dentry, err, rerr); | |
4a4d8108 AM |
19760 | + err = -EIO; |
19761 | + } else | |
19762 | + dput(wh); | |
19763 | + | |
4f0767ce | 19764 | +out: |
4a4d8108 AM |
19765 | + return err; |
19766 | +} | |
19767 | + | |
027c5e7a AM |
19768 | +static int au_d_may_add(struct dentry *dentry) |
19769 | +{ | |
19770 | + int err; | |
19771 | + | |
19772 | + err = 0; | |
19773 | + if (unlikely(d_unhashed(dentry))) | |
19774 | + err = -ENOENT; | |
5527c038 | 19775 | + if (unlikely(d_really_is_positive(dentry))) |
027c5e7a AM |
19776 | + err = -EEXIST; |
19777 | + return err; | |
19778 | +} | |
19779 | + | |
4a4d8108 AM |
19780 | +/* |
19781 | + * simple tests for the adding inode operations. | |
19782 | + * following the checks in vfs, plus the parent-child relationship. | |
19783 | + */ | |
19784 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
19785 | + struct dentry *h_parent, int isdir) | |
19786 | +{ | |
19787 | + int err; | |
19788 | + umode_t h_mode; | |
19789 | + struct dentry *h_dentry; | |
19790 | + struct inode *h_inode; | |
19791 | + | |
19792 | + err = -ENAMETOOLONG; | |
19793 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
19794 | + goto out; | |
19795 | + | |
19796 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 19797 | + if (d_really_is_negative(dentry)) { |
4a4d8108 | 19798 | + err = -EEXIST; |
5527c038 | 19799 | + if (unlikely(d_is_positive(h_dentry))) |
4a4d8108 AM |
19800 | + goto out; |
19801 | + } else { | |
19802 | + /* rename(2) case */ | |
19803 | + err = -EIO; | |
5527c038 JR |
19804 | + if (unlikely(d_is_negative(h_dentry))) |
19805 | + goto out; | |
19806 | + h_inode = d_inode(h_dentry); | |
19807 | + if (unlikely(!h_inode->i_nlink)) | |
4a4d8108 AM |
19808 | + goto out; |
19809 | + | |
19810 | + h_mode = h_inode->i_mode; | |
19811 | + if (!isdir) { | |
19812 | + err = -EISDIR; | |
19813 | + if (unlikely(S_ISDIR(h_mode))) | |
19814 | + goto out; | |
19815 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
19816 | + err = -ENOTDIR; | |
19817 | + goto out; | |
19818 | + } | |
19819 | + } | |
19820 | + | |
19821 | + err = 0; | |
19822 | + /* expected parent dir is locked */ | |
19823 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
19824 | + err = -EIO; | |
19825 | + | |
4f0767ce | 19826 | +out: |
4a4d8108 AM |
19827 | + AuTraceErr(err); |
19828 | + return err; | |
19829 | +} | |
19830 | + | |
19831 | +/* | |
19832 | + * initial procedure of adding a new entry. | |
19833 | + * prepare writable branch and the parent dir, lock it, | |
19834 | + * and lookup whiteout for the new entry. | |
19835 | + */ | |
19836 | +static struct dentry* | |
19837 | +lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, | |
19838 | + struct dentry *src_dentry, struct au_pin *pin, | |
19839 | + struct au_wr_dir_args *wr_dir_args) | |
19840 | +{ | |
19841 | + struct dentry *wh_dentry, *h_parent; | |
19842 | + struct super_block *sb; | |
19843 | + struct au_branch *br; | |
19844 | + int err; | |
19845 | + unsigned int udba; | |
19846 | + aufs_bindex_t bcpup; | |
19847 | + | |
523b37e3 | 19848 | + AuDbg("%pd\n", dentry); |
4a4d8108 AM |
19849 | + |
19850 | + err = au_wr_dir(dentry, src_dentry, wr_dir_args); | |
19851 | + bcpup = err; | |
19852 | + wh_dentry = ERR_PTR(err); | |
19853 | + if (unlikely(err < 0)) | |
19854 | + goto out; | |
19855 | + | |
19856 | + sb = dentry->d_sb; | |
19857 | + udba = au_opt_udba(sb); | |
19858 | + err = au_pin(pin, dentry, bcpup, udba, | |
19859 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
19860 | + wh_dentry = ERR_PTR(err); | |
19861 | + if (unlikely(err)) | |
19862 | + goto out; | |
19863 | + | |
19864 | + h_parent = au_pinned_h_parent(pin); | |
19865 | + if (udba != AuOpt_UDBA_NONE | |
5afbbe0d | 19866 | + && au_dbtop(dentry) == bcpup) |
4a4d8108 AM |
19867 | + err = au_may_add(dentry, bcpup, h_parent, |
19868 | + au_ftest_wrdir(wr_dir_args->flags, ISDIR)); | |
19869 | + else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
19870 | + err = -ENAMETOOLONG; | |
19871 | + wh_dentry = ERR_PTR(err); | |
19872 | + if (unlikely(err)) | |
19873 | + goto out_unpin; | |
19874 | + | |
19875 | + br = au_sbr(sb, bcpup); | |
19876 | + if (dt) { | |
19877 | + struct path tmp = { | |
19878 | + .dentry = h_parent, | |
86dc4139 | 19879 | + .mnt = au_br_mnt(br) |
4a4d8108 AM |
19880 | + }; |
19881 | + au_dtime_store(dt, au_pinned_parent(pin), &tmp); | |
19882 | + } | |
19883 | + | |
19884 | + wh_dentry = NULL; | |
19885 | + if (bcpup != au_dbwh(dentry)) | |
19886 | + goto out; /* success */ | |
19887 | + | |
2000de60 JR |
19888 | + /* |
19889 | + * ENAMETOOLONG here means that if we allowed create such name, then it | |
19890 | + * would not be able to removed in the future. So we don't allow such | |
19891 | + * name here and we don't handle ENAMETOOLONG differently here. | |
19892 | + */ | |
4a4d8108 AM |
19893 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); |
19894 | + | |
4f0767ce | 19895 | +out_unpin: |
4a4d8108 AM |
19896 | + if (IS_ERR(wh_dentry)) |
19897 | + au_unpin(pin); | |
4f0767ce | 19898 | +out: |
4a4d8108 AM |
19899 | + return wh_dentry; |
19900 | +} | |
19901 | + | |
19902 | +/* ---------------------------------------------------------------------- */ | |
19903 | + | |
19904 | +enum { Mknod, Symlink, Creat }; | |
19905 | +struct simple_arg { | |
19906 | + int type; | |
19907 | + union { | |
19908 | + struct { | |
b912730e AM |
19909 | + umode_t mode; |
19910 | + bool want_excl; | |
19911 | + bool try_aopen; | |
19912 | + struct vfsub_aopen_args *aopen; | |
4a4d8108 AM |
19913 | + } c; |
19914 | + struct { | |
19915 | + const char *symname; | |
19916 | + } s; | |
19917 | + struct { | |
7eafdf33 | 19918 | + umode_t mode; |
4a4d8108 AM |
19919 | + dev_t dev; |
19920 | + } m; | |
19921 | + } u; | |
19922 | +}; | |
19923 | + | |
19924 | +static int add_simple(struct inode *dir, struct dentry *dentry, | |
19925 | + struct simple_arg *arg) | |
19926 | +{ | |
076b876e | 19927 | + int err, rerr; |
5afbbe0d | 19928 | + aufs_bindex_t btop; |
4a4d8108 | 19929 | + unsigned char created; |
b912730e AM |
19930 | + const unsigned char try_aopen |
19931 | + = (arg->type == Creat && arg->u.c.try_aopen); | |
4a4d8108 AM |
19932 | + struct dentry *wh_dentry, *parent; |
19933 | + struct inode *h_dir; | |
b912730e AM |
19934 | + struct super_block *sb; |
19935 | + struct au_branch *br; | |
c2b27bf2 AM |
19936 | + /* to reuduce stack size */ |
19937 | + struct { | |
19938 | + struct au_dtime dt; | |
19939 | + struct au_pin pin; | |
19940 | + struct path h_path; | |
19941 | + struct au_wr_dir_args wr_dir_args; | |
19942 | + } *a; | |
4a4d8108 | 19943 | + |
523b37e3 | 19944 | + AuDbg("%pd\n", dentry); |
4a4d8108 AM |
19945 | + IMustLock(dir); |
19946 | + | |
c2b27bf2 AM |
19947 | + err = -ENOMEM; |
19948 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
19949 | + if (unlikely(!a)) | |
19950 | + goto out; | |
19951 | + a->wr_dir_args.force_btgt = -1; | |
19952 | + a->wr_dir_args.flags = AuWrDir_ADD_ENTRY; | |
19953 | + | |
4a4d8108 | 19954 | + parent = dentry->d_parent; /* dir inode is locked */ |
b912730e AM |
19955 | + if (!try_aopen) { |
19956 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); | |
19957 | + if (unlikely(err)) | |
19958 | + goto out_free; | |
19959 | + } | |
027c5e7a AM |
19960 | + err = au_d_may_add(dentry); |
19961 | + if (unlikely(err)) | |
19962 | + goto out_unlock; | |
b912730e AM |
19963 | + if (!try_aopen) |
19964 | + di_write_lock_parent(parent); | |
c2b27bf2 AM |
19965 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, |
19966 | + &a->pin, &a->wr_dir_args); | |
4a4d8108 AM |
19967 | + err = PTR_ERR(wh_dentry); |
19968 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 19969 | + goto out_parent; |
4a4d8108 | 19970 | + |
5afbbe0d | 19971 | + btop = au_dbtop(dentry); |
b912730e | 19972 | + sb = dentry->d_sb; |
5afbbe0d AM |
19973 | + br = au_sbr(sb, btop); |
19974 | + a->h_path.dentry = au_h_dptr(dentry, btop); | |
b912730e | 19975 | + a->h_path.mnt = au_br_mnt(br); |
c2b27bf2 | 19976 | + h_dir = au_pinned_h_dir(&a->pin); |
4a4d8108 AM |
19977 | + switch (arg->type) { |
19978 | + case Creat: | |
b912730e AM |
19979 | + err = 0; |
19980 | + if (!try_aopen || !h_dir->i_op->atomic_open) | |
19981 | + err = vfsub_create(h_dir, &a->h_path, arg->u.c.mode, | |
19982 | + arg->u.c.want_excl); | |
19983 | + else | |
19984 | + err = vfsub_atomic_open(h_dir, a->h_path.dentry, | |
19985 | + arg->u.c.aopen, br); | |
4a4d8108 AM |
19986 | + break; |
19987 | + case Symlink: | |
c2b27bf2 | 19988 | + err = vfsub_symlink(h_dir, &a->h_path, arg->u.s.symname); |
4a4d8108 AM |
19989 | + break; |
19990 | + case Mknod: | |
c2b27bf2 AM |
19991 | + err = vfsub_mknod(h_dir, &a->h_path, arg->u.m.mode, |
19992 | + arg->u.m.dev); | |
4a4d8108 AM |
19993 | + break; |
19994 | + default: | |
19995 | + BUG(); | |
19996 | + } | |
19997 | + created = !err; | |
19998 | + if (!err) | |
5afbbe0d | 19999 | + err = epilog(dir, btop, wh_dentry, dentry); |
4a4d8108 AM |
20000 | + |
20001 | + /* revert */ | |
5527c038 | 20002 | + if (unlikely(created && err && d_is_positive(a->h_path.dentry))) { |
523b37e3 AM |
20003 | + /* no delegation since it is just created */ |
20004 | + rerr = vfsub_unlink(h_dir, &a->h_path, /*delegated*/NULL, | |
20005 | + /*force*/0); | |
4a4d8108 | 20006 | + if (rerr) { |
523b37e3 AM |
20007 | + AuIOErr("%pd revert failure(%d, %d)\n", |
20008 | + dentry, err, rerr); | |
4a4d8108 AM |
20009 | + err = -EIO; |
20010 | + } | |
c2b27bf2 | 20011 | + au_dtime_revert(&a->dt); |
4a4d8108 AM |
20012 | + } |
20013 | + | |
b912730e AM |
20014 | + if (!err && try_aopen && !h_dir->i_op->atomic_open) |
20015 | + *arg->u.c.aopen->opened |= FILE_CREATED; | |
20016 | + | |
c2b27bf2 | 20017 | + au_unpin(&a->pin); |
4a4d8108 AM |
20018 | + dput(wh_dentry); |
20019 | + | |
027c5e7a | 20020 | +out_parent: |
b912730e AM |
20021 | + if (!try_aopen) |
20022 | + di_write_unlock(parent); | |
027c5e7a | 20023 | +out_unlock: |
4a4d8108 | 20024 | + if (unlikely(err)) { |
5afbbe0d | 20025 | + au_update_dbtop(dentry); |
4a4d8108 AM |
20026 | + d_drop(dentry); |
20027 | + } | |
b912730e AM |
20028 | + if (!try_aopen) |
20029 | + aufs_read_unlock(dentry, AuLock_DW); | |
c2b27bf2 | 20030 | +out_free: |
1c60b727 | 20031 | + kfree(a); |
027c5e7a | 20032 | +out: |
4a4d8108 AM |
20033 | + return err; |
20034 | +} | |
20035 | + | |
7eafdf33 AM |
20036 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, |
20037 | + dev_t dev) | |
4a4d8108 AM |
20038 | +{ |
20039 | + struct simple_arg arg = { | |
20040 | + .type = Mknod, | |
20041 | + .u.m = { | |
20042 | + .mode = mode, | |
20043 | + .dev = dev | |
20044 | + } | |
20045 | + }; | |
20046 | + return add_simple(dir, dentry, &arg); | |
20047 | +} | |
20048 | + | |
20049 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
20050 | +{ | |
20051 | + struct simple_arg arg = { | |
20052 | + .type = Symlink, | |
20053 | + .u.s.symname = symname | |
20054 | + }; | |
20055 | + return add_simple(dir, dentry, &arg); | |
20056 | +} | |
20057 | + | |
7eafdf33 | 20058 | +int aufs_create(struct inode *dir, struct dentry *dentry, umode_t mode, |
b4510431 | 20059 | + bool want_excl) |
4a4d8108 AM |
20060 | +{ |
20061 | + struct simple_arg arg = { | |
20062 | + .type = Creat, | |
20063 | + .u.c = { | |
b4510431 AM |
20064 | + .mode = mode, |
20065 | + .want_excl = want_excl | |
4a4d8108 AM |
20066 | + } |
20067 | + }; | |
20068 | + return add_simple(dir, dentry, &arg); | |
20069 | +} | |
20070 | + | |
b912730e AM |
20071 | +int au_aopen_or_create(struct inode *dir, struct dentry *dentry, |
20072 | + struct vfsub_aopen_args *aopen_args) | |
20073 | +{ | |
20074 | + struct simple_arg arg = { | |
20075 | + .type = Creat, | |
20076 | + .u.c = { | |
20077 | + .mode = aopen_args->create_mode, | |
20078 | + .want_excl = aopen_args->open_flag & O_EXCL, | |
20079 | + .try_aopen = true, | |
20080 | + .aopen = aopen_args | |
20081 | + } | |
20082 | + }; | |
20083 | + return add_simple(dir, dentry, &arg); | |
20084 | +} | |
20085 | + | |
38d290e6 JR |
20086 | +int aufs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t mode) |
20087 | +{ | |
20088 | + int err; | |
20089 | + aufs_bindex_t bindex; | |
20090 | + struct super_block *sb; | |
20091 | + struct dentry *parent, *h_parent, *h_dentry; | |
20092 | + struct inode *h_dir, *inode; | |
20093 | + struct vfsmount *h_mnt; | |
20094 | + struct au_wr_dir_args wr_dir_args = { | |
20095 | + .force_btgt = -1, | |
20096 | + .flags = AuWrDir_TMPFILE | |
20097 | + }; | |
20098 | + | |
20099 | + /* copy-up may happen */ | |
febd17d6 | 20100 | + inode_lock(dir); |
38d290e6 JR |
20101 | + |
20102 | + sb = dir->i_sb; | |
20103 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
20104 | + if (unlikely(err)) | |
20105 | + goto out; | |
20106 | + | |
20107 | + err = au_di_init(dentry); | |
20108 | + if (unlikely(err)) | |
20109 | + goto out_si; | |
20110 | + | |
20111 | + err = -EBUSY; | |
20112 | + parent = d_find_any_alias(dir); | |
20113 | + AuDebugOn(!parent); | |
20114 | + di_write_lock_parent(parent); | |
5527c038 | 20115 | + if (unlikely(d_inode(parent) != dir)) |
38d290e6 JR |
20116 | + goto out_parent; |
20117 | + | |
20118 | + err = au_digen_test(parent, au_sigen(sb)); | |
20119 | + if (unlikely(err)) | |
20120 | + goto out_parent; | |
20121 | + | |
5afbbe0d AM |
20122 | + bindex = au_dbtop(parent); |
20123 | + au_set_dbtop(dentry, bindex); | |
20124 | + au_set_dbbot(dentry, bindex); | |
38d290e6 JR |
20125 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
20126 | + bindex = err; | |
20127 | + if (unlikely(err < 0)) | |
20128 | + goto out_parent; | |
20129 | + | |
20130 | + err = -EOPNOTSUPP; | |
20131 | + h_dir = au_h_iptr(dir, bindex); | |
20132 | + if (unlikely(!h_dir->i_op->tmpfile)) | |
20133 | + goto out_parent; | |
20134 | + | |
20135 | + h_mnt = au_sbr_mnt(sb, bindex); | |
20136 | + err = vfsub_mnt_want_write(h_mnt); | |
20137 | + if (unlikely(err)) | |
20138 | + goto out_parent; | |
20139 | + | |
20140 | + h_parent = au_h_dptr(parent, bindex); | |
521ced18 JR |
20141 | + h_dentry = vfs_tmpfile(h_parent, mode, /*open_flag*/0); |
20142 | + if (IS_ERR(h_dentry)) { | |
20143 | + err = PTR_ERR(h_dentry); | |
38d290e6 | 20144 | + goto out_mnt; |
521ced18 | 20145 | + } |
38d290e6 | 20146 | + |
5afbbe0d AM |
20147 | + au_set_dbtop(dentry, bindex); |
20148 | + au_set_dbbot(dentry, bindex); | |
38d290e6 JR |
20149 | + au_set_h_dptr(dentry, bindex, dget(h_dentry)); |
20150 | + inode = au_new_inode(dentry, /*must_new*/1); | |
20151 | + if (IS_ERR(inode)) { | |
20152 | + err = PTR_ERR(inode); | |
20153 | + au_set_h_dptr(dentry, bindex, NULL); | |
5afbbe0d AM |
20154 | + au_set_dbtop(dentry, -1); |
20155 | + au_set_dbbot(dentry, -1); | |
38d290e6 JR |
20156 | + } else { |
20157 | + if (!inode->i_nlink) | |
20158 | + set_nlink(inode, 1); | |
20159 | + d_tmpfile(dentry, inode); | |
20160 | + au_di(dentry)->di_tmpfile = 1; | |
20161 | + | |
20162 | + /* update without i_mutex */ | |
5afbbe0d | 20163 | + if (au_ibtop(dir) == au_dbtop(dentry)) |
38d290e6 JR |
20164 | + au_cpup_attr_timesizes(dir); |
20165 | + } | |
38d290e6 | 20166 | + dput(h_dentry); |
521ced18 | 20167 | + |
38d290e6 JR |
20168 | +out_mnt: |
20169 | + vfsub_mnt_drop_write(h_mnt); | |
20170 | +out_parent: | |
20171 | + di_write_unlock(parent); | |
20172 | + dput(parent); | |
20173 | + di_write_unlock(dentry); | |
5afbbe0d | 20174 | + if (unlikely(err)) { |
38d290e6 JR |
20175 | + au_di_fin(dentry); |
20176 | + dentry->d_fsdata = NULL; | |
20177 | + } | |
20178 | +out_si: | |
20179 | + si_read_unlock(sb); | |
20180 | +out: | |
febd17d6 | 20181 | + inode_unlock(dir); |
38d290e6 JR |
20182 | + return err; |
20183 | +} | |
20184 | + | |
4a4d8108 AM |
20185 | +/* ---------------------------------------------------------------------- */ |
20186 | + | |
20187 | +struct au_link_args { | |
20188 | + aufs_bindex_t bdst, bsrc; | |
20189 | + struct au_pin pin; | |
20190 | + struct path h_path; | |
20191 | + struct dentry *src_parent, *parent; | |
20192 | +}; | |
20193 | + | |
20194 | +static int au_cpup_before_link(struct dentry *src_dentry, | |
20195 | + struct au_link_args *a) | |
20196 | +{ | |
20197 | + int err; | |
20198 | + struct dentry *h_src_dentry; | |
c2b27bf2 AM |
20199 | + struct au_cp_generic cpg = { |
20200 | + .dentry = src_dentry, | |
20201 | + .bdst = a->bdst, | |
20202 | + .bsrc = a->bsrc, | |
20203 | + .len = -1, | |
20204 | + .pin = &a->pin, | |
20205 | + .flags = AuCpup_DTIME | AuCpup_HOPEN /* | AuCpup_KEEPLINO */ | |
20206 | + }; | |
4a4d8108 AM |
20207 | + |
20208 | + di_read_lock_parent(a->src_parent, AuLock_IR); | |
20209 | + err = au_test_and_cpup_dirs(src_dentry, a->bdst); | |
20210 | + if (unlikely(err)) | |
20211 | + goto out; | |
20212 | + | |
20213 | + h_src_dentry = au_h_dptr(src_dentry, a->bsrc); | |
4a4d8108 AM |
20214 | + err = au_pin(&a->pin, src_dentry, a->bdst, |
20215 | + au_opt_udba(src_dentry->d_sb), | |
20216 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
20217 | + if (unlikely(err)) | |
20218 | + goto out; | |
367653fa | 20219 | + |
c2b27bf2 | 20220 | + err = au_sio_cpup_simple(&cpg); |
4a4d8108 AM |
20221 | + au_unpin(&a->pin); |
20222 | + | |
4f0767ce | 20223 | +out: |
4a4d8108 AM |
20224 | + di_read_unlock(a->src_parent, AuLock_IR); |
20225 | + return err; | |
20226 | +} | |
20227 | + | |
86dc4139 AM |
20228 | +static int au_cpup_or_link(struct dentry *src_dentry, struct dentry *dentry, |
20229 | + struct au_link_args *a) | |
4a4d8108 AM |
20230 | +{ |
20231 | + int err; | |
20232 | + unsigned char plink; | |
5afbbe0d | 20233 | + aufs_bindex_t bbot; |
4a4d8108 | 20234 | + struct dentry *h_src_dentry; |
523b37e3 | 20235 | + struct inode *h_inode, *inode, *delegated; |
4a4d8108 AM |
20236 | + struct super_block *sb; |
20237 | + struct file *h_file; | |
20238 | + | |
20239 | + plink = 0; | |
20240 | + h_inode = NULL; | |
20241 | + sb = src_dentry->d_sb; | |
5527c038 | 20242 | + inode = d_inode(src_dentry); |
5afbbe0d | 20243 | + if (au_ibtop(inode) <= a->bdst) |
4a4d8108 AM |
20244 | + h_inode = au_h_iptr(inode, a->bdst); |
20245 | + if (!h_inode || !h_inode->i_nlink) { | |
20246 | + /* copyup src_dentry as the name of dentry. */ | |
5afbbe0d AM |
20247 | + bbot = au_dbbot(dentry); |
20248 | + if (bbot < a->bsrc) | |
20249 | + au_set_dbbot(dentry, a->bsrc); | |
86dc4139 AM |
20250 | + au_set_h_dptr(dentry, a->bsrc, |
20251 | + dget(au_h_dptr(src_dentry, a->bsrc))); | |
20252 | + dget(a->h_path.dentry); | |
20253 | + au_set_h_dptr(dentry, a->bdst, NULL); | |
c1595e42 JR |
20254 | + AuDbg("temporary d_inode...\n"); |
20255 | + spin_lock(&dentry->d_lock); | |
5527c038 | 20256 | + dentry->d_inode = d_inode(src_dentry); /* tmp */ |
c1595e42 | 20257 | + spin_unlock(&dentry->d_lock); |
392086de | 20258 | + h_file = au_h_open_pre(dentry, a->bsrc, /*force_wr*/0); |
86dc4139 | 20259 | + if (IS_ERR(h_file)) |
4a4d8108 | 20260 | + err = PTR_ERR(h_file); |
86dc4139 | 20261 | + else { |
c2b27bf2 AM |
20262 | + struct au_cp_generic cpg = { |
20263 | + .dentry = dentry, | |
20264 | + .bdst = a->bdst, | |
20265 | + .bsrc = -1, | |
20266 | + .len = -1, | |
20267 | + .pin = &a->pin, | |
20268 | + .flags = AuCpup_KEEPLINO | |
20269 | + }; | |
20270 | + err = au_sio_cpup_simple(&cpg); | |
86dc4139 AM |
20271 | + au_h_open_post(dentry, a->bsrc, h_file); |
20272 | + if (!err) { | |
20273 | + dput(a->h_path.dentry); | |
20274 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); | |
20275 | + } else | |
20276 | + au_set_h_dptr(dentry, a->bdst, | |
20277 | + a->h_path.dentry); | |
20278 | + } | |
c1595e42 | 20279 | + spin_lock(&dentry->d_lock); |
86dc4139 | 20280 | + dentry->d_inode = NULL; /* restore */ |
c1595e42 JR |
20281 | + spin_unlock(&dentry->d_lock); |
20282 | + AuDbg("temporary d_inode...done\n"); | |
86dc4139 | 20283 | + au_set_h_dptr(dentry, a->bsrc, NULL); |
5afbbe0d | 20284 | + au_set_dbbot(dentry, bbot); |
4a4d8108 AM |
20285 | + } else { |
20286 | + /* the inode of src_dentry already exists on a.bdst branch */ | |
20287 | + h_src_dentry = d_find_alias(h_inode); | |
20288 | + if (!h_src_dentry && au_plink_test(inode)) { | |
20289 | + plink = 1; | |
20290 | + h_src_dentry = au_plink_lkup(inode, a->bdst); | |
20291 | + err = PTR_ERR(h_src_dentry); | |
20292 | + if (IS_ERR(h_src_dentry)) | |
20293 | + goto out; | |
20294 | + | |
5527c038 | 20295 | + if (unlikely(d_is_negative(h_src_dentry))) { |
4a4d8108 AM |
20296 | + dput(h_src_dentry); |
20297 | + h_src_dentry = NULL; | |
20298 | + } | |
20299 | + | |
20300 | + } | |
20301 | + if (h_src_dentry) { | |
523b37e3 | 20302 | + delegated = NULL; |
4a4d8108 | 20303 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), |
523b37e3 AM |
20304 | + &a->h_path, &delegated); |
20305 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20306 | + pr_warn("cannot retry for NFSv4 delegation" | |
20307 | + " for an internal link\n"); | |
20308 | + iput(delegated); | |
20309 | + } | |
4a4d8108 AM |
20310 | + dput(h_src_dentry); |
20311 | + } else { | |
20312 | + AuIOErr("no dentry found for hi%lu on b%d\n", | |
20313 | + h_inode->i_ino, a->bdst); | |
20314 | + err = -EIO; | |
20315 | + } | |
20316 | + } | |
20317 | + | |
20318 | + if (!err && !plink) | |
20319 | + au_plink_append(inode, a->bdst, a->h_path.dentry); | |
20320 | + | |
20321 | +out: | |
2cbb1c4b | 20322 | + AuTraceErr(err); |
4a4d8108 AM |
20323 | + return err; |
20324 | +} | |
20325 | + | |
20326 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
20327 | + struct dentry *dentry) | |
20328 | +{ | |
20329 | + int err, rerr; | |
20330 | + struct au_dtime dt; | |
20331 | + struct au_link_args *a; | |
20332 | + struct dentry *wh_dentry, *h_src_dentry; | |
523b37e3 | 20333 | + struct inode *inode, *delegated; |
4a4d8108 AM |
20334 | + struct super_block *sb; |
20335 | + struct au_wr_dir_args wr_dir_args = { | |
20336 | + /* .force_btgt = -1, */ | |
20337 | + .flags = AuWrDir_ADD_ENTRY | |
20338 | + }; | |
20339 | + | |
20340 | + IMustLock(dir); | |
5527c038 | 20341 | + inode = d_inode(src_dentry); |
4a4d8108 AM |
20342 | + IMustLock(inode); |
20343 | + | |
4a4d8108 AM |
20344 | + err = -ENOMEM; |
20345 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
20346 | + if (unlikely(!a)) | |
20347 | + goto out; | |
20348 | + | |
20349 | + a->parent = dentry->d_parent; /* dir inode is locked */ | |
027c5e7a AM |
20350 | + err = aufs_read_and_write_lock2(dentry, src_dentry, |
20351 | + AuLock_NOPLM | AuLock_GEN); | |
e49829fe JR |
20352 | + if (unlikely(err)) |
20353 | + goto out_kfree; | |
38d290e6 | 20354 | + err = au_d_linkable(src_dentry); |
027c5e7a AM |
20355 | + if (unlikely(err)) |
20356 | + goto out_unlock; | |
20357 | + err = au_d_may_add(dentry); | |
20358 | + if (unlikely(err)) | |
20359 | + goto out_unlock; | |
e49829fe | 20360 | + |
4a4d8108 | 20361 | + a->src_parent = dget_parent(src_dentry); |
5afbbe0d | 20362 | + wr_dir_args.force_btgt = au_ibtop(inode); |
4a4d8108 AM |
20363 | + |
20364 | + di_write_lock_parent(a->parent); | |
20365 | + wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); | |
20366 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, | |
20367 | + &wr_dir_args); | |
20368 | + err = PTR_ERR(wh_dentry); | |
20369 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 20370 | + goto out_parent; |
4a4d8108 AM |
20371 | + |
20372 | + err = 0; | |
20373 | + sb = dentry->d_sb; | |
5afbbe0d | 20374 | + a->bdst = au_dbtop(dentry); |
4a4d8108 AM |
20375 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); |
20376 | + a->h_path.mnt = au_sbr_mnt(sb, a->bdst); | |
5afbbe0d | 20377 | + a->bsrc = au_ibtop(inode); |
2cbb1c4b | 20378 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); |
38d290e6 JR |
20379 | + if (!h_src_dentry && au_di(src_dentry)->di_tmpfile) |
20380 | + h_src_dentry = dget(au_hi_wh(inode, a->bsrc)); | |
2cbb1c4b | 20381 | + if (!h_src_dentry) { |
5afbbe0d | 20382 | + a->bsrc = au_dbtop(src_dentry); |
2cbb1c4b JR |
20383 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); |
20384 | + AuDebugOn(!h_src_dentry); | |
38d290e6 JR |
20385 | + } else if (IS_ERR(h_src_dentry)) { |
20386 | + err = PTR_ERR(h_src_dentry); | |
2cbb1c4b | 20387 | + goto out_parent; |
38d290e6 | 20388 | + } |
2cbb1c4b | 20389 | + |
f2c43d5f AM |
20390 | + /* |
20391 | + * aufs doesn't touch the credential so | |
20392 | + * security_dentry_create_files_as() is unnecrssary. | |
20393 | + */ | |
4a4d8108 AM |
20394 | + if (au_opt_test(au_mntflags(sb), PLINK)) { |
20395 | + if (a->bdst < a->bsrc | |
20396 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) | |
86dc4139 | 20397 | + err = au_cpup_or_link(src_dentry, dentry, a); |
523b37e3 AM |
20398 | + else { |
20399 | + delegated = NULL; | |
4a4d8108 | 20400 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), |
523b37e3 AM |
20401 | + &a->h_path, &delegated); |
20402 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20403 | + pr_warn("cannot retry for NFSv4 delegation" | |
20404 | + " for an internal link\n"); | |
20405 | + iput(delegated); | |
20406 | + } | |
20407 | + } | |
2cbb1c4b | 20408 | + dput(h_src_dentry); |
4a4d8108 AM |
20409 | + } else { |
20410 | + /* | |
20411 | + * copyup src_dentry to the branch we process, | |
20412 | + * and then link(2) to it. | |
20413 | + */ | |
2cbb1c4b | 20414 | + dput(h_src_dentry); |
4a4d8108 AM |
20415 | + if (a->bdst < a->bsrc |
20416 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { | |
20417 | + au_unpin(&a->pin); | |
20418 | + di_write_unlock(a->parent); | |
20419 | + err = au_cpup_before_link(src_dentry, a); | |
20420 | + di_write_lock_parent(a->parent); | |
20421 | + if (!err) | |
20422 | + err = au_pin(&a->pin, dentry, a->bdst, | |
20423 | + au_opt_udba(sb), | |
20424 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
20425 | + if (unlikely(err)) | |
20426 | + goto out_wh; | |
20427 | + } | |
20428 | + if (!err) { | |
20429 | + h_src_dentry = au_h_dptr(src_dentry, a->bdst); | |
20430 | + err = -ENOENT; | |
5527c038 | 20431 | + if (h_src_dentry && d_is_positive(h_src_dentry)) { |
523b37e3 | 20432 | + delegated = NULL; |
4a4d8108 AM |
20433 | + err = vfsub_link(h_src_dentry, |
20434 | + au_pinned_h_dir(&a->pin), | |
523b37e3 AM |
20435 | + &a->h_path, &delegated); |
20436 | + if (unlikely(err == -EWOULDBLOCK)) { | |
20437 | + pr_warn("cannot retry" | |
20438 | + " for NFSv4 delegation" | |
20439 | + " for an internal link\n"); | |
20440 | + iput(delegated); | |
20441 | + } | |
20442 | + } | |
4a4d8108 AM |
20443 | + } |
20444 | + } | |
20445 | + if (unlikely(err)) | |
20446 | + goto out_unpin; | |
20447 | + | |
20448 | + if (wh_dentry) { | |
20449 | + a->h_path.dentry = wh_dentry; | |
20450 | + err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, | |
20451 | + dentry); | |
20452 | + if (unlikely(err)) | |
20453 | + goto out_revert; | |
20454 | + } | |
20455 | + | |
b912730e | 20456 | + au_dir_ts(dir, a->bdst); |
be118d29 | 20457 | + inode_inc_iversion(dir); |
4a4d8108 AM |
20458 | + inc_nlink(inode); |
20459 | + inode->i_ctime = dir->i_ctime; | |
027c5e7a AM |
20460 | + d_instantiate(dentry, au_igrab(inode)); |
20461 | + if (d_unhashed(a->h_path.dentry)) | |
4a4d8108 AM |
20462 | + /* some filesystem calls d_drop() */ |
20463 | + d_drop(dentry); | |
076b876e AM |
20464 | + /* some filesystems consume an inode even hardlink */ |
20465 | + au_fhsm_wrote(sb, a->bdst, /*force*/0); | |
4a4d8108 AM |
20466 | + goto out_unpin; /* success */ |
20467 | + | |
4f0767ce | 20468 | +out_revert: |
523b37e3 AM |
20469 | + /* no delegation since it is just created */ |
20470 | + rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, | |
20471 | + /*delegated*/NULL, /*force*/0); | |
027c5e7a | 20472 | + if (unlikely(rerr)) { |
523b37e3 | 20473 | + AuIOErr("%pd reverting failed(%d, %d)\n", dentry, err, rerr); |
027c5e7a AM |
20474 | + err = -EIO; |
20475 | + } | |
4a4d8108 | 20476 | + au_dtime_revert(&dt); |
4f0767ce | 20477 | +out_unpin: |
4a4d8108 | 20478 | + au_unpin(&a->pin); |
4f0767ce | 20479 | +out_wh: |
4a4d8108 | 20480 | + dput(wh_dentry); |
027c5e7a AM |
20481 | +out_parent: |
20482 | + di_write_unlock(a->parent); | |
20483 | + dput(a->src_parent); | |
4f0767ce | 20484 | +out_unlock: |
4a4d8108 | 20485 | + if (unlikely(err)) { |
5afbbe0d | 20486 | + au_update_dbtop(dentry); |
4a4d8108 AM |
20487 | + d_drop(dentry); |
20488 | + } | |
4a4d8108 | 20489 | + aufs_read_and_write_unlock2(dentry, src_dentry); |
e49829fe | 20490 | +out_kfree: |
1c60b727 | 20491 | + kfree(a); |
4f0767ce | 20492 | +out: |
86dc4139 | 20493 | + AuTraceErr(err); |
4a4d8108 AM |
20494 | + return err; |
20495 | +} | |
20496 | + | |
7eafdf33 | 20497 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) |
4a4d8108 AM |
20498 | +{ |
20499 | + int err, rerr; | |
20500 | + aufs_bindex_t bindex; | |
20501 | + unsigned char diropq; | |
20502 | + struct path h_path; | |
20503 | + struct dentry *wh_dentry, *parent, *opq_dentry; | |
febd17d6 | 20504 | + struct inode *h_inode; |
4a4d8108 AM |
20505 | + struct super_block *sb; |
20506 | + struct { | |
20507 | + struct au_pin pin; | |
20508 | + struct au_dtime dt; | |
20509 | + } *a; /* reduce the stack usage */ | |
20510 | + struct au_wr_dir_args wr_dir_args = { | |
20511 | + .force_btgt = -1, | |
20512 | + .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR | |
20513 | + }; | |
20514 | + | |
20515 | + IMustLock(dir); | |
20516 | + | |
20517 | + err = -ENOMEM; | |
20518 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
20519 | + if (unlikely(!a)) | |
20520 | + goto out; | |
20521 | + | |
027c5e7a AM |
20522 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
20523 | + if (unlikely(err)) | |
20524 | + goto out_free; | |
20525 | + err = au_d_may_add(dentry); | |
20526 | + if (unlikely(err)) | |
20527 | + goto out_unlock; | |
20528 | + | |
4a4d8108 AM |
20529 | + parent = dentry->d_parent; /* dir inode is locked */ |
20530 | + di_write_lock_parent(parent); | |
20531 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, | |
20532 | + &a->pin, &wr_dir_args); | |
20533 | + err = PTR_ERR(wh_dentry); | |
20534 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 20535 | + goto out_parent; |
4a4d8108 AM |
20536 | + |
20537 | + sb = dentry->d_sb; | |
5afbbe0d | 20538 | + bindex = au_dbtop(dentry); |
4a4d8108 AM |
20539 | + h_path.dentry = au_h_dptr(dentry, bindex); |
20540 | + h_path.mnt = au_sbr_mnt(sb, bindex); | |
20541 | + err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); | |
20542 | + if (unlikely(err)) | |
027c5e7a | 20543 | + goto out_unpin; |
4a4d8108 AM |
20544 | + |
20545 | + /* make the dir opaque */ | |
20546 | + diropq = 0; | |
febd17d6 | 20547 | + h_inode = d_inode(h_path.dentry); |
4a4d8108 AM |
20548 | + if (wh_dentry |
20549 | + || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { | |
febd17d6 | 20550 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
4a4d8108 | 20551 | + opq_dentry = au_diropq_create(dentry, bindex); |
febd17d6 | 20552 | + inode_unlock(h_inode); |
4a4d8108 AM |
20553 | + err = PTR_ERR(opq_dentry); |
20554 | + if (IS_ERR(opq_dentry)) | |
20555 | + goto out_dir; | |
20556 | + dput(opq_dentry); | |
20557 | + diropq = 1; | |
20558 | + } | |
20559 | + | |
20560 | + err = epilog(dir, bindex, wh_dentry, dentry); | |
20561 | + if (!err) { | |
20562 | + inc_nlink(dir); | |
027c5e7a | 20563 | + goto out_unpin; /* success */ |
4a4d8108 AM |
20564 | + } |
20565 | + | |
20566 | + /* revert */ | |
20567 | + if (diropq) { | |
20568 | + AuLabel(revert opq); | |
febd17d6 | 20569 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
4a4d8108 | 20570 | + rerr = au_diropq_remove(dentry, bindex); |
febd17d6 | 20571 | + inode_unlock(h_inode); |
4a4d8108 | 20572 | + if (rerr) { |
523b37e3 AM |
20573 | + AuIOErr("%pd reverting diropq failed(%d, %d)\n", |
20574 | + dentry, err, rerr); | |
4a4d8108 AM |
20575 | + err = -EIO; |
20576 | + } | |
20577 | + } | |
20578 | + | |
4f0767ce | 20579 | +out_dir: |
4a4d8108 AM |
20580 | + AuLabel(revert dir); |
20581 | + rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); | |
20582 | + if (rerr) { | |
523b37e3 AM |
20583 | + AuIOErr("%pd reverting dir failed(%d, %d)\n", |
20584 | + dentry, err, rerr); | |
4a4d8108 AM |
20585 | + err = -EIO; |
20586 | + } | |
4a4d8108 | 20587 | + au_dtime_revert(&a->dt); |
027c5e7a | 20588 | +out_unpin: |
4a4d8108 AM |
20589 | + au_unpin(&a->pin); |
20590 | + dput(wh_dentry); | |
027c5e7a AM |
20591 | +out_parent: |
20592 | + di_write_unlock(parent); | |
20593 | +out_unlock: | |
4a4d8108 | 20594 | + if (unlikely(err)) { |
5afbbe0d | 20595 | + au_update_dbtop(dentry); |
4a4d8108 AM |
20596 | + d_drop(dentry); |
20597 | + } | |
4a4d8108 | 20598 | + aufs_read_unlock(dentry, AuLock_DW); |
027c5e7a | 20599 | +out_free: |
1c60b727 | 20600 | + kfree(a); |
4f0767ce | 20601 | +out: |
4a4d8108 AM |
20602 | + return err; |
20603 | +} | |
7f207e10 AM |
20604 | diff -urN /usr/share/empty/fs/aufs/i_op.c linux/fs/aufs/i_op.c |
20605 | --- /usr/share/empty/fs/aufs/i_op.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 20606 | +++ linux/fs/aufs/i_op.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 20607 | @@ -0,0 +1,1460 @@ |
cd7a4cd9 | 20608 | +// SPDX-License-Identifier: GPL-2.0 |
4a4d8108 | 20609 | +/* |
b00004a5 | 20610 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
4a4d8108 AM |
20611 | + * |
20612 | + * This program, aufs is free software; you can redistribute it and/or modify | |
20613 | + * it under the terms of the GNU General Public License as published by | |
20614 | + * the Free Software Foundation; either version 2 of the License, or | |
20615 | + * (at your option) any later version. | |
20616 | + * | |
20617 | + * This program is distributed in the hope that it will be useful, | |
20618 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20619 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20620 | + * GNU General Public License for more details. | |
20621 | + * | |
20622 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 20623 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
4a4d8108 | 20624 | + */ |
1facf9fc | 20625 | + |
1308ab2a | 20626 | +/* |
4a4d8108 | 20627 | + * inode operations (except add/del/rename) |
1308ab2a | 20628 | + */ |
4a4d8108 AM |
20629 | + |
20630 | +#include <linux/device_cgroup.h> | |
20631 | +#include <linux/fs_stack.h> | |
4a4d8108 AM |
20632 | +#include <linux/namei.h> |
20633 | +#include <linux/security.h> | |
4a4d8108 AM |
20634 | +#include "aufs.h" |
20635 | + | |
1e00d052 | 20636 | +static int h_permission(struct inode *h_inode, int mask, |
79b8bda9 | 20637 | + struct path *h_path, int brperm) |
1facf9fc | 20638 | +{ |
1308ab2a | 20639 | + int err; |
4a4d8108 | 20640 | + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); |
1facf9fc | 20641 | + |
e2f27e51 AM |
20642 | + err = -EPERM; |
20643 | + if (write_mask && IS_IMMUTABLE(h_inode)) | |
20644 | + goto out; | |
20645 | + | |
4a4d8108 | 20646 | + err = -EACCES; |
e2f27e51 AM |
20647 | + if (((mask & MAY_EXEC) |
20648 | + && S_ISREG(h_inode->i_mode) | |
20649 | + && (path_noexec(h_path) | |
cd7a4cd9 | 20650 | + || !(h_inode->i_mode & 0111)))) |
4a4d8108 AM |
20651 | + goto out; |
20652 | + | |
20653 | + /* | |
20654 | + * - skip the lower fs test in the case of write to ro branch. | |
20655 | + * - nfs dir permission write check is optimized, but a policy for | |
20656 | + * link/rename requires a real check. | |
2121bcd9 | 20657 | + * - nfs always sets SB_POSIXACL regardless its mount option 'noacl.' |
b912730e | 20658 | + * in this case, generic_permission() returns -EOPNOTSUPP. |
4a4d8108 AM |
20659 | + */ |
20660 | + if ((write_mask && !au_br_writable(brperm)) | |
20661 | + || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode) | |
20662 | + && write_mask && !(mask & MAY_READ)) | |
20663 | + || !h_inode->i_op->permission) { | |
20664 | + /* AuLabel(generic_permission); */ | |
062440b3 | 20665 | + /* AuDbg("get_acl %ps\n", h_inode->i_op->get_acl); */ |
1e00d052 | 20666 | + err = generic_permission(h_inode, mask); |
b912730e AM |
20667 | + if (err == -EOPNOTSUPP && au_test_nfs_noacl(h_inode)) |
20668 | + err = h_inode->i_op->permission(h_inode, mask); | |
20669 | + AuTraceErr(err); | |
1308ab2a | 20670 | + } else { |
4a4d8108 | 20671 | + /* AuLabel(h_inode->permission); */ |
1e00d052 | 20672 | + err = h_inode->i_op->permission(h_inode, mask); |
4a4d8108 AM |
20673 | + AuTraceErr(err); |
20674 | + } | |
1facf9fc | 20675 | + |
4a4d8108 AM |
20676 | + if (!err) |
20677 | + err = devcgroup_inode_permission(h_inode, mask); | |
7f207e10 | 20678 | + if (!err) |
4a4d8108 | 20679 | + err = security_inode_permission(h_inode, mask); |
4a4d8108 AM |
20680 | + |
20681 | +#if 0 | |
20682 | + if (!err) { | |
20683 | + /* todo: do we need to call ima_path_check()? */ | |
20684 | + struct path h_path = { | |
20685 | + .dentry = | |
20686 | + .mnt = h_mnt | |
20687 | + }; | |
20688 | + err = ima_path_check(&h_path, | |
20689 | + mask & (MAY_READ | MAY_WRITE | MAY_EXEC), | |
20690 | + IMA_COUNT_LEAVE); | |
1308ab2a | 20691 | + } |
4a4d8108 | 20692 | +#endif |
dece6358 | 20693 | + |
4f0767ce | 20694 | +out: |
1308ab2a | 20695 | + return err; |
20696 | +} | |
dece6358 | 20697 | + |
1e00d052 | 20698 | +static int aufs_permission(struct inode *inode, int mask) |
1308ab2a | 20699 | +{ |
20700 | + int err; | |
5afbbe0d | 20701 | + aufs_bindex_t bindex, bbot; |
4a4d8108 AM |
20702 | + const unsigned char isdir = !!S_ISDIR(inode->i_mode), |
20703 | + write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); | |
20704 | + struct inode *h_inode; | |
20705 | + struct super_block *sb; | |
20706 | + struct au_branch *br; | |
1facf9fc | 20707 | + |
027c5e7a | 20708 | + /* todo: support rcu-walk? */ |
1e00d052 | 20709 | + if (mask & MAY_NOT_BLOCK) |
027c5e7a AM |
20710 | + return -ECHILD; |
20711 | + | |
4a4d8108 AM |
20712 | + sb = inode->i_sb; |
20713 | + si_read_lock(sb, AuLock_FLUSH); | |
20714 | + ii_read_lock_child(inode); | |
027c5e7a AM |
20715 | +#if 0 |
20716 | + err = au_iigen_test(inode, au_sigen(sb)); | |
20717 | + if (unlikely(err)) | |
20718 | + goto out; | |
20719 | +#endif | |
dece6358 | 20720 | + |
076b876e AM |
20721 | + if (!isdir |
20722 | + || write_mask | |
20723 | + || au_opt_test(au_mntflags(sb), DIRPERM1)) { | |
4a4d8108 | 20724 | + err = au_busy_or_stale(); |
5afbbe0d | 20725 | + h_inode = au_h_iptr(inode, au_ibtop(inode)); |
4a4d8108 AM |
20726 | + if (unlikely(!h_inode |
20727 | + || (h_inode->i_mode & S_IFMT) | |
20728 | + != (inode->i_mode & S_IFMT))) | |
20729 | + goto out; | |
1facf9fc | 20730 | + |
4a4d8108 | 20731 | + err = 0; |
5afbbe0d | 20732 | + bindex = au_ibtop(inode); |
4a4d8108 | 20733 | + br = au_sbr(sb, bindex); |
79b8bda9 | 20734 | + err = h_permission(h_inode, mask, &br->br_path, br->br_perm); |
4a4d8108 AM |
20735 | + if (write_mask |
20736 | + && !err | |
20737 | + && !special_file(h_inode->i_mode)) { | |
20738 | + /* test whether the upper writable branch exists */ | |
20739 | + err = -EROFS; | |
20740 | + for (; bindex >= 0; bindex--) | |
20741 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
20742 | + err = 0; | |
20743 | + break; | |
20744 | + } | |
20745 | + } | |
20746 | + goto out; | |
20747 | + } | |
dece6358 | 20748 | + |
4a4d8108 | 20749 | + /* non-write to dir */ |
1308ab2a | 20750 | + err = 0; |
5afbbe0d AM |
20751 | + bbot = au_ibbot(inode); |
20752 | + for (bindex = au_ibtop(inode); !err && bindex <= bbot; bindex++) { | |
4a4d8108 AM |
20753 | + h_inode = au_h_iptr(inode, bindex); |
20754 | + if (h_inode) { | |
20755 | + err = au_busy_or_stale(); | |
20756 | + if (unlikely(!S_ISDIR(h_inode->i_mode))) | |
20757 | + break; | |
20758 | + | |
20759 | + br = au_sbr(sb, bindex); | |
79b8bda9 | 20760 | + err = h_permission(h_inode, mask, &br->br_path, |
4a4d8108 AM |
20761 | + br->br_perm); |
20762 | + } | |
20763 | + } | |
1308ab2a | 20764 | + |
4f0767ce | 20765 | +out: |
4a4d8108 AM |
20766 | + ii_read_unlock(inode); |
20767 | + si_read_unlock(sb); | |
1308ab2a | 20768 | + return err; |
20769 | +} | |
20770 | + | |
4a4d8108 | 20771 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 20772 | + |
4a4d8108 | 20773 | +static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry, |
b4510431 | 20774 | + unsigned int flags) |
4a4d8108 AM |
20775 | +{ |
20776 | + struct dentry *ret, *parent; | |
b752ccd1 | 20777 | + struct inode *inode; |
4a4d8108 | 20778 | + struct super_block *sb; |
1716fcea | 20779 | + int err, npositive; |
dece6358 | 20780 | + |
4a4d8108 | 20781 | + IMustLock(dir); |
1308ab2a | 20782 | + |
537831f9 AM |
20783 | + /* todo: support rcu-walk? */ |
20784 | + ret = ERR_PTR(-ECHILD); | |
20785 | + if (flags & LOOKUP_RCU) | |
20786 | + goto out; | |
20787 | + | |
20788 | + ret = ERR_PTR(-ENAMETOOLONG); | |
20789 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
20790 | + goto out; | |
20791 | + | |
4a4d8108 | 20792 | + sb = dir->i_sb; |
7f207e10 AM |
20793 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
20794 | + ret = ERR_PTR(err); | |
20795 | + if (unlikely(err)) | |
20796 | + goto out; | |
20797 | + | |
4a4d8108 AM |
20798 | + err = au_di_init(dentry); |
20799 | + ret = ERR_PTR(err); | |
20800 | + if (unlikely(err)) | |
7f207e10 | 20801 | + goto out_si; |
1308ab2a | 20802 | + |
9dbd164d | 20803 | + inode = NULL; |
027c5e7a | 20804 | + npositive = 0; /* suppress a warning */ |
4a4d8108 AM |
20805 | + parent = dentry->d_parent; /* dir inode is locked */ |
20806 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a AM |
20807 | + err = au_alive_dir(parent); |
20808 | + if (!err) | |
20809 | + err = au_digen_test(parent, au_sigen(sb)); | |
20810 | + if (!err) { | |
5afbbe0d AM |
20811 | + /* regardless LOOKUP_CREATE, always ALLOW_NEG */ |
20812 | + npositive = au_lkup_dentry(dentry, au_dbtop(parent), | |
20813 | + AuLkup_ALLOW_NEG); | |
027c5e7a AM |
20814 | + err = npositive; |
20815 | + } | |
4a4d8108 | 20816 | + di_read_unlock(parent, AuLock_IR); |
4a4d8108 AM |
20817 | + ret = ERR_PTR(err); |
20818 | + if (unlikely(err < 0)) | |
20819 | + goto out_unlock; | |
1308ab2a | 20820 | + |
4a4d8108 | 20821 | + if (npositive) { |
b752ccd1 | 20822 | + inode = au_new_inode(dentry, /*must_new*/0); |
c1595e42 JR |
20823 | + if (IS_ERR(inode)) { |
20824 | + ret = (void *)inode; | |
20825 | + inode = NULL; | |
20826 | + goto out_unlock; | |
20827 | + } | |
9dbd164d | 20828 | + } |
4a4d8108 | 20829 | + |
c1595e42 JR |
20830 | + if (inode) |
20831 | + atomic_inc(&inode->i_count); | |
4a4d8108 | 20832 | + ret = d_splice_alias(inode, dentry); |
537831f9 AM |
20833 | +#if 0 |
20834 | + if (unlikely(d_need_lookup(dentry))) { | |
20835 | + spin_lock(&dentry->d_lock); | |
20836 | + dentry->d_flags &= ~DCACHE_NEED_LOOKUP; | |
20837 | + spin_unlock(&dentry->d_lock); | |
20838 | + } else | |
20839 | +#endif | |
c1595e42 | 20840 | + if (inode) { |
2000de60 | 20841 | + if (!IS_ERR(ret)) { |
c1595e42 | 20842 | + iput(inode); |
2000de60 JR |
20843 | + if (ret && ret != dentry) |
20844 | + ii_write_unlock(inode); | |
20845 | + } else { | |
c1595e42 JR |
20846 | + ii_write_unlock(inode); |
20847 | + iput(inode); | |
20848 | + inode = NULL; | |
20849 | + } | |
7f207e10 | 20850 | + } |
1facf9fc | 20851 | + |
4f0767ce | 20852 | +out_unlock: |
4a4d8108 | 20853 | + di_write_unlock(dentry); |
7f207e10 | 20854 | +out_si: |
4a4d8108 | 20855 | + si_read_unlock(sb); |
7f207e10 | 20856 | +out: |
4a4d8108 AM |
20857 | + return ret; |
20858 | +} | |
1facf9fc | 20859 | + |
4a4d8108 | 20860 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 20861 | + |
b912730e | 20862 | +struct aopen_node { |
8b6a4947 | 20863 | + struct hlist_bl_node hblist; |
b912730e AM |
20864 | + struct file *file, *h_file; |
20865 | +}; | |
20866 | + | |
20867 | +static int au_do_aopen(struct inode *inode, struct file *file) | |
20868 | +{ | |
8b6a4947 AM |
20869 | + struct hlist_bl_head *aopen; |
20870 | + struct hlist_bl_node *pos; | |
b912730e AM |
20871 | + struct aopen_node *node; |
20872 | + struct au_do_open_args args = { | |
8b6a4947 AM |
20873 | + .aopen = 1, |
20874 | + .open = au_do_open_nondir | |
b912730e AM |
20875 | + }; |
20876 | + | |
20877 | + aopen = &au_sbi(inode->i_sb)->si_aopen; | |
8b6a4947 AM |
20878 | + hlist_bl_lock(aopen); |
20879 | + hlist_bl_for_each_entry(node, pos, aopen, hblist) | |
b912730e AM |
20880 | + if (node->file == file) { |
20881 | + args.h_file = node->h_file; | |
20882 | + break; | |
20883 | + } | |
8b6a4947 | 20884 | + hlist_bl_unlock(aopen); |
b912730e AM |
20885 | + /* AuDebugOn(!args.h_file); */ |
20886 | + | |
20887 | + return au_do_open(file, &args); | |
20888 | +} | |
20889 | + | |
20890 | +static int aufs_atomic_open(struct inode *dir, struct dentry *dentry, | |
20891 | + struct file *file, unsigned int open_flag, | |
20892 | + umode_t create_mode, int *opened) | |
20893 | +{ | |
8b6a4947 | 20894 | + int err, unlocked, h_opened = *opened; |
5afbbe0d | 20895 | + unsigned int lkup_flags; |
f0c0a007 | 20896 | + struct dentry *parent, *d; |
8b6a4947 | 20897 | + struct hlist_bl_head *aopen; |
b912730e AM |
20898 | + struct vfsub_aopen_args args = { |
20899 | + .open_flag = open_flag, | |
20900 | + .create_mode = create_mode, | |
20901 | + .opened = &h_opened | |
20902 | + }; | |
20903 | + struct aopen_node aopen_node = { | |
20904 | + .file = file | |
20905 | + }; | |
20906 | + | |
20907 | + IMustLock(dir); | |
5afbbe0d | 20908 | + AuDbg("open_flag 0%o\n", open_flag); |
b912730e AM |
20909 | + AuDbgDentry(dentry); |
20910 | + | |
20911 | + err = 0; | |
20912 | + if (!au_di(dentry)) { | |
5afbbe0d AM |
20913 | + lkup_flags = LOOKUP_OPEN; |
20914 | + if (open_flag & O_CREAT) | |
20915 | + lkup_flags |= LOOKUP_CREATE; | |
20916 | + d = aufs_lookup(dir, dentry, lkup_flags); | |
b912730e AM |
20917 | + if (IS_ERR(d)) { |
20918 | + err = PTR_ERR(d); | |
5afbbe0d | 20919 | + AuTraceErr(err); |
b912730e AM |
20920 | + goto out; |
20921 | + } else if (d) { | |
20922 | + /* | |
20923 | + * obsoleted dentry found. | |
20924 | + * another error will be returned later. | |
20925 | + */ | |
20926 | + d_drop(d); | |
b912730e | 20927 | + AuDbgDentry(d); |
5afbbe0d | 20928 | + dput(d); |
b912730e AM |
20929 | + } |
20930 | + AuDbgDentry(dentry); | |
20931 | + } | |
20932 | + | |
20933 | + if (d_is_positive(dentry) | |
20934 | + || d_unhashed(dentry) | |
20935 | + || d_unlinked(dentry) | |
20936 | + || !(open_flag & O_CREAT)) | |
20937 | + goto out_no_open; | |
20938 | + | |
8b6a4947 | 20939 | + unlocked = 0; |
b912730e AM |
20940 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); |
20941 | + if (unlikely(err)) | |
20942 | + goto out; | |
20943 | + | |
20944 | + parent = dentry->d_parent; /* dir is locked */ | |
20945 | + di_write_lock_parent(parent); | |
5afbbe0d | 20946 | + err = au_lkup_dentry(dentry, /*btop*/0, AuLkup_ALLOW_NEG); |
b912730e AM |
20947 | + if (unlikely(err)) |
20948 | + goto out_unlock; | |
20949 | + | |
20950 | + AuDbgDentry(dentry); | |
20951 | + if (d_is_positive(dentry)) | |
20952 | + goto out_unlock; | |
20953 | + | |
20954 | + args.file = get_empty_filp(); | |
20955 | + err = PTR_ERR(args.file); | |
20956 | + if (IS_ERR(args.file)) | |
20957 | + goto out_unlock; | |
20958 | + | |
20959 | + args.file->f_flags = file->f_flags; | |
20960 | + err = au_aopen_or_create(dir, dentry, &args); | |
20961 | + AuTraceErr(err); | |
20962 | + AuDbgFile(args.file); | |
20963 | + if (unlikely(err < 0)) { | |
20964 | + if (h_opened & FILE_OPENED) | |
20965 | + fput(args.file); | |
20966 | + else | |
20967 | + put_filp(args.file); | |
20968 | + goto out_unlock; | |
20969 | + } | |
8b6a4947 AM |
20970 | + di_write_unlock(parent); |
20971 | + di_write_unlock(dentry); | |
20972 | + unlocked = 1; | |
b912730e AM |
20973 | + |
20974 | + /* some filesystems don't set FILE_CREATED while succeeded? */ | |
20975 | + *opened |= FILE_CREATED; | |
20976 | + if (h_opened & FILE_OPENED) | |
20977 | + aopen_node.h_file = args.file; | |
20978 | + else { | |
20979 | + put_filp(args.file); | |
20980 | + args.file = NULL; | |
20981 | + } | |
20982 | + aopen = &au_sbi(dir->i_sb)->si_aopen; | |
8b6a4947 | 20983 | + au_hbl_add(&aopen_node.hblist, aopen); |
b912730e | 20984 | + err = finish_open(file, dentry, au_do_aopen, opened); |
8b6a4947 | 20985 | + au_hbl_del(&aopen_node.hblist, aopen); |
b912730e AM |
20986 | + AuTraceErr(err); |
20987 | + AuDbgFile(file); | |
20988 | + if (aopen_node.h_file) | |
20989 | + fput(aopen_node.h_file); | |
20990 | + | |
20991 | +out_unlock: | |
8b6a4947 AM |
20992 | + if (unlocked) |
20993 | + si_read_unlock(dentry->d_sb); | |
20994 | + else { | |
20995 | + di_write_unlock(parent); | |
20996 | + aufs_read_unlock(dentry, AuLock_DW); | |
20997 | + } | |
b912730e | 20998 | + AuDbgDentry(dentry); |
f0c0a007 | 20999 | + if (unlikely(err < 0)) |
b912730e AM |
21000 | + goto out; |
21001 | +out_no_open: | |
f0c0a007 | 21002 | + if (err >= 0 && !(*opened & FILE_CREATED)) { |
b912730e AM |
21003 | + AuLabel(out_no_open); |
21004 | + dget(dentry); | |
21005 | + err = finish_no_open(file, dentry); | |
21006 | + } | |
21007 | +out: | |
21008 | + AuDbg("%pd%s%s\n", dentry, | |
21009 | + (*opened & FILE_CREATED) ? " created" : "", | |
21010 | + (*opened & FILE_OPENED) ? " opened" : ""); | |
21011 | + AuTraceErr(err); | |
21012 | + return err; | |
21013 | +} | |
21014 | + | |
21015 | + | |
21016 | +/* ---------------------------------------------------------------------- */ | |
21017 | + | |
4a4d8108 AM |
21018 | +static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent, |
21019 | + const unsigned char add_entry, aufs_bindex_t bcpup, | |
5afbbe0d | 21020 | + aufs_bindex_t btop) |
4a4d8108 AM |
21021 | +{ |
21022 | + int err; | |
21023 | + struct dentry *h_parent; | |
21024 | + struct inode *h_dir; | |
1facf9fc | 21025 | + |
027c5e7a | 21026 | + if (add_entry) |
5527c038 | 21027 | + IMustLock(d_inode(parent)); |
027c5e7a | 21028 | + else |
4a4d8108 AM |
21029 | + di_write_lock_parent(parent); |
21030 | + | |
21031 | + err = 0; | |
21032 | + if (!au_h_dptr(parent, bcpup)) { | |
5afbbe0d | 21033 | + if (btop > bcpup) |
c2b27bf2 | 21034 | + err = au_cpup_dirs(dentry, bcpup); |
5afbbe0d | 21035 | + else if (btop < bcpup) |
4a4d8108 AM |
21036 | + err = au_cpdown_dirs(dentry, bcpup); |
21037 | + else | |
c2b27bf2 | 21038 | + BUG(); |
4a4d8108 | 21039 | + } |
38d290e6 | 21040 | + if (!err && add_entry && !au_ftest_wrdir(add_entry, TMPFILE)) { |
4a4d8108 | 21041 | + h_parent = au_h_dptr(parent, bcpup); |
5527c038 | 21042 | + h_dir = d_inode(h_parent); |
be118d29 | 21043 | + inode_lock_shared_nested(h_dir, AuLsc_I_PARENT); |
7e9cd9fe | 21044 | + err = au_lkup_neg(dentry, bcpup, /*wh*/0); |
4a4d8108 | 21045 | + /* todo: no unlock here */ |
3c1bdaff | 21046 | + inode_unlock_shared(h_dir); |
027c5e7a AM |
21047 | + |
21048 | + AuDbg("bcpup %d\n", bcpup); | |
21049 | + if (!err) { | |
5527c038 | 21050 | + if (d_really_is_negative(dentry)) |
5afbbe0d | 21051 | + au_set_h_dptr(dentry, btop, NULL); |
4a4d8108 AM |
21052 | + au_update_dbrange(dentry, /*do_put_zero*/0); |
21053 | + } | |
1308ab2a | 21054 | + } |
1facf9fc | 21055 | + |
4a4d8108 AM |
21056 | + if (!add_entry) |
21057 | + di_write_unlock(parent); | |
21058 | + if (!err) | |
21059 | + err = bcpup; /* success */ | |
1308ab2a | 21060 | + |
027c5e7a | 21061 | + AuTraceErr(err); |
4a4d8108 AM |
21062 | + return err; |
21063 | +} | |
1facf9fc | 21064 | + |
4a4d8108 AM |
21065 | +/* |
21066 | + * decide the branch and the parent dir where we will create a new entry. | |
21067 | + * returns new bindex or an error. | |
21068 | + * copyup the parent dir if needed. | |
21069 | + */ | |
21070 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
21071 | + struct au_wr_dir_args *args) | |
21072 | +{ | |
21073 | + int err; | |
392086de | 21074 | + unsigned int flags; |
5afbbe0d | 21075 | + aufs_bindex_t bcpup, btop, src_btop; |
86dc4139 AM |
21076 | + const unsigned char add_entry |
21077 | + = au_ftest_wrdir(args->flags, ADD_ENTRY) | |
38d290e6 | 21078 | + | au_ftest_wrdir(args->flags, TMPFILE); |
4a4d8108 AM |
21079 | + struct super_block *sb; |
21080 | + struct dentry *parent; | |
21081 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 21082 | + |
4a4d8108 AM |
21083 | + sb = dentry->d_sb; |
21084 | + sbinfo = au_sbi(sb); | |
21085 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
21086 | + btop = au_dbtop(dentry); |
21087 | + bcpup = btop; | |
4a4d8108 AM |
21088 | + if (args->force_btgt < 0) { |
21089 | + if (src_dentry) { | |
5afbbe0d AM |
21090 | + src_btop = au_dbtop(src_dentry); |
21091 | + if (src_btop < btop) | |
21092 | + bcpup = src_btop; | |
4a4d8108 | 21093 | + } else if (add_entry) { |
392086de AM |
21094 | + flags = 0; |
21095 | + if (au_ftest_wrdir(args->flags, ISDIR)) | |
21096 | + au_fset_wbr(flags, DIR); | |
21097 | + err = AuWbrCreate(sbinfo, dentry, flags); | |
4a4d8108 AM |
21098 | + bcpup = err; |
21099 | + } | |
1facf9fc | 21100 | + |
5527c038 | 21101 | + if (bcpup < 0 || au_test_ro(sb, bcpup, d_inode(dentry))) { |
4a4d8108 AM |
21102 | + if (add_entry) |
21103 | + err = AuWbrCopyup(sbinfo, dentry); | |
21104 | + else { | |
21105 | + if (!IS_ROOT(dentry)) { | |
21106 | + di_read_lock_parent(parent, !AuLock_IR); | |
21107 | + err = AuWbrCopyup(sbinfo, dentry); | |
21108 | + di_read_unlock(parent, !AuLock_IR); | |
21109 | + } else | |
21110 | + err = AuWbrCopyup(sbinfo, dentry); | |
21111 | + } | |
21112 | + bcpup = err; | |
21113 | + if (unlikely(err < 0)) | |
21114 | + goto out; | |
21115 | + } | |
21116 | + } else { | |
21117 | + bcpup = args->force_btgt; | |
5527c038 | 21118 | + AuDebugOn(au_test_ro(sb, bcpup, d_inode(dentry))); |
1308ab2a | 21119 | + } |
027c5e7a | 21120 | + |
5afbbe0d | 21121 | + AuDbg("btop %d, bcpup %d\n", btop, bcpup); |
4a4d8108 | 21122 | + err = bcpup; |
5afbbe0d | 21123 | + if (bcpup == btop) |
4a4d8108 | 21124 | + goto out; /* success */ |
4a4d8108 AM |
21125 | + |
21126 | + /* copyup the new parent into the branch we process */ | |
5afbbe0d | 21127 | + err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, btop); |
027c5e7a | 21128 | + if (err >= 0) { |
5527c038 | 21129 | + if (d_really_is_negative(dentry)) { |
5afbbe0d AM |
21130 | + au_set_h_dptr(dentry, btop, NULL); |
21131 | + au_set_dbtop(dentry, bcpup); | |
21132 | + au_set_dbbot(dentry, bcpup); | |
027c5e7a | 21133 | + } |
38d290e6 JR |
21134 | + AuDebugOn(add_entry |
21135 | + && !au_ftest_wrdir(args->flags, TMPFILE) | |
21136 | + && !au_h_dptr(dentry, bcpup)); | |
027c5e7a | 21137 | + } |
86dc4139 AM |
21138 | + |
21139 | +out: | |
21140 | + dput(parent); | |
21141 | + return err; | |
21142 | +} | |
21143 | + | |
21144 | +/* ---------------------------------------------------------------------- */ | |
21145 | + | |
21146 | +void au_pin_hdir_unlock(struct au_pin *p) | |
21147 | +{ | |
21148 | + if (p->hdir) | |
5afbbe0d | 21149 | + au_hn_inode_unlock(p->hdir); |
86dc4139 AM |
21150 | +} |
21151 | + | |
c1595e42 | 21152 | +int au_pin_hdir_lock(struct au_pin *p) |
86dc4139 AM |
21153 | +{ |
21154 | + int err; | |
21155 | + | |
21156 | + err = 0; | |
21157 | + if (!p->hdir) | |
21158 | + goto out; | |
21159 | + | |
21160 | + /* even if an error happens later, keep this lock */ | |
5afbbe0d | 21161 | + au_hn_inode_lock_nested(p->hdir, p->lsc_hi); |
86dc4139 AM |
21162 | + |
21163 | + err = -EBUSY; | |
5527c038 | 21164 | + if (unlikely(p->hdir->hi_inode != d_inode(p->h_parent))) |
86dc4139 AM |
21165 | + goto out; |
21166 | + | |
21167 | + err = 0; | |
21168 | + if (p->h_dentry) | |
21169 | + err = au_h_verify(p->h_dentry, p->udba, p->hdir->hi_inode, | |
21170 | + p->h_parent, p->br); | |
21171 | + | |
21172 | +out: | |
21173 | + return err; | |
21174 | +} | |
21175 | + | |
21176 | +int au_pin_hdir_relock(struct au_pin *p) | |
21177 | +{ | |
21178 | + int err, i; | |
21179 | + struct inode *h_i; | |
21180 | + struct dentry *h_d[] = { | |
21181 | + p->h_dentry, | |
21182 | + p->h_parent | |
21183 | + }; | |
21184 | + | |
21185 | + err = au_pin_hdir_lock(p); | |
21186 | + if (unlikely(err)) | |
21187 | + goto out; | |
21188 | + | |
21189 | + for (i = 0; !err && i < sizeof(h_d)/sizeof(*h_d); i++) { | |
21190 | + if (!h_d[i]) | |
21191 | + continue; | |
5527c038 JR |
21192 | + if (d_is_positive(h_d[i])) { |
21193 | + h_i = d_inode(h_d[i]); | |
86dc4139 | 21194 | + err = !h_i->i_nlink; |
5527c038 | 21195 | + } |
86dc4139 AM |
21196 | + } |
21197 | + | |
21198 | +out: | |
21199 | + return err; | |
21200 | +} | |
21201 | + | |
5afbbe0d | 21202 | +static void au_pin_hdir_set_owner(struct au_pin *p, struct task_struct *task) |
86dc4139 | 21203 | +{ |
5afbbe0d AM |
21204 | +#if !defined(CONFIG_RWSEM_GENERIC_SPINLOCK) && defined(CONFIG_RWSEM_SPIN_ON_OWNER) |
21205 | + p->hdir->hi_inode->i_rwsem.owner = task; | |
86dc4139 AM |
21206 | +#endif |
21207 | +} | |
21208 | + | |
21209 | +void au_pin_hdir_acquire_nest(struct au_pin *p) | |
21210 | +{ | |
21211 | + if (p->hdir) { | |
5afbbe0d | 21212 | + rwsem_acquire_nest(&p->hdir->hi_inode->i_rwsem.dep_map, |
86dc4139 AM |
21213 | + p->lsc_hi, 0, NULL, _RET_IP_); |
21214 | + au_pin_hdir_set_owner(p, current); | |
21215 | + } | |
dece6358 | 21216 | +} |
1facf9fc | 21217 | + |
86dc4139 AM |
21218 | +void au_pin_hdir_release(struct au_pin *p) |
21219 | +{ | |
21220 | + if (p->hdir) { | |
21221 | + au_pin_hdir_set_owner(p, p->task); | |
5afbbe0d | 21222 | + rwsem_release(&p->hdir->hi_inode->i_rwsem.dep_map, 1, _RET_IP_); |
86dc4139 AM |
21223 | + } |
21224 | +} | |
1308ab2a | 21225 | + |
4a4d8108 | 21226 | +struct dentry *au_pinned_h_parent(struct au_pin *pin) |
1308ab2a | 21227 | +{ |
4a4d8108 AM |
21228 | + if (pin && pin->parent) |
21229 | + return au_h_dptr(pin->parent, pin->bindex); | |
21230 | + return NULL; | |
dece6358 | 21231 | +} |
1facf9fc | 21232 | + |
4a4d8108 | 21233 | +void au_unpin(struct au_pin *p) |
dece6358 | 21234 | +{ |
86dc4139 AM |
21235 | + if (p->hdir) |
21236 | + au_pin_hdir_unlock(p); | |
e49829fe | 21237 | + if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE)) |
b4510431 | 21238 | + vfsub_mnt_drop_write(p->h_mnt); |
4a4d8108 AM |
21239 | + if (!p->hdir) |
21240 | + return; | |
1facf9fc | 21241 | + |
4a4d8108 AM |
21242 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21243 | + di_read_unlock(p->parent, AuLock_IR); | |
21244 | + iput(p->hdir->hi_inode); | |
21245 | + dput(p->parent); | |
21246 | + p->parent = NULL; | |
21247 | + p->hdir = NULL; | |
21248 | + p->h_mnt = NULL; | |
86dc4139 | 21249 | + /* do not clear p->task */ |
4a4d8108 | 21250 | +} |
1308ab2a | 21251 | + |
4a4d8108 AM |
21252 | +int au_do_pin(struct au_pin *p) |
21253 | +{ | |
21254 | + int err; | |
21255 | + struct super_block *sb; | |
4a4d8108 AM |
21256 | + struct inode *h_dir; |
21257 | + | |
21258 | + err = 0; | |
21259 | + sb = p->dentry->d_sb; | |
86dc4139 | 21260 | + p->br = au_sbr(sb, p->bindex); |
4a4d8108 AM |
21261 | + if (IS_ROOT(p->dentry)) { |
21262 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { | |
86dc4139 | 21263 | + p->h_mnt = au_br_mnt(p->br); |
b4510431 | 21264 | + err = vfsub_mnt_want_write(p->h_mnt); |
4a4d8108 AM |
21265 | + if (unlikely(err)) { |
21266 | + au_fclr_pin(p->flags, MNT_WRITE); | |
21267 | + goto out_err; | |
21268 | + } | |
21269 | + } | |
dece6358 | 21270 | + goto out; |
1facf9fc | 21271 | + } |
21272 | + | |
86dc4139 | 21273 | + p->h_dentry = NULL; |
5afbbe0d | 21274 | + if (p->bindex <= au_dbbot(p->dentry)) |
86dc4139 | 21275 | + p->h_dentry = au_h_dptr(p->dentry, p->bindex); |
dece6358 | 21276 | + |
4a4d8108 AM |
21277 | + p->parent = dget_parent(p->dentry); |
21278 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
21279 | + di_read_lock(p->parent, AuLock_IR, p->lsc_di); | |
dece6358 | 21280 | + |
4a4d8108 | 21281 | + h_dir = NULL; |
86dc4139 | 21282 | + p->h_parent = au_h_dptr(p->parent, p->bindex); |
5527c038 | 21283 | + p->hdir = au_hi(d_inode(p->parent), p->bindex); |
4a4d8108 AM |
21284 | + if (p->hdir) |
21285 | + h_dir = p->hdir->hi_inode; | |
dece6358 | 21286 | + |
b752ccd1 AM |
21287 | + /* |
21288 | + * udba case, or | |
21289 | + * if DI_LOCKED is not set, then p->parent may be different | |
21290 | + * and h_parent can be NULL. | |
21291 | + */ | |
86dc4139 | 21292 | + if (unlikely(!p->hdir || !h_dir || !p->h_parent)) { |
e49829fe | 21293 | + err = -EBUSY; |
4a4d8108 AM |
21294 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21295 | + di_read_unlock(p->parent, AuLock_IR); | |
21296 | + dput(p->parent); | |
21297 | + p->parent = NULL; | |
21298 | + goto out_err; | |
21299 | + } | |
1308ab2a | 21300 | + |
4a4d8108 | 21301 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { |
86dc4139 | 21302 | + p->h_mnt = au_br_mnt(p->br); |
b4510431 | 21303 | + err = vfsub_mnt_want_write(p->h_mnt); |
dece6358 | 21304 | + if (unlikely(err)) { |
4a4d8108 | 21305 | + au_fclr_pin(p->flags, MNT_WRITE); |
86dc4139 AM |
21306 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
21307 | + di_read_unlock(p->parent, AuLock_IR); | |
21308 | + dput(p->parent); | |
21309 | + p->parent = NULL; | |
21310 | + goto out_err; | |
dece6358 AM |
21311 | + } |
21312 | + } | |
4a4d8108 | 21313 | + |
86dc4139 AM |
21314 | + au_igrab(h_dir); |
21315 | + err = au_pin_hdir_lock(p); | |
21316 | + if (!err) | |
21317 | + goto out; /* success */ | |
21318 | + | |
076b876e AM |
21319 | + au_unpin(p); |
21320 | + | |
4f0767ce | 21321 | +out_err: |
4a4d8108 AM |
21322 | + pr_err("err %d\n", err); |
21323 | + err = au_busy_or_stale(); | |
4f0767ce | 21324 | +out: |
1facf9fc | 21325 | + return err; |
21326 | +} | |
21327 | + | |
4a4d8108 AM |
21328 | +void au_pin_init(struct au_pin *p, struct dentry *dentry, |
21329 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
21330 | + unsigned int udba, unsigned char flags) | |
21331 | +{ | |
21332 | + p->dentry = dentry; | |
21333 | + p->udba = udba; | |
21334 | + p->lsc_di = lsc_di; | |
21335 | + p->lsc_hi = lsc_hi; | |
21336 | + p->flags = flags; | |
21337 | + p->bindex = bindex; | |
21338 | + | |
21339 | + p->parent = NULL; | |
21340 | + p->hdir = NULL; | |
21341 | + p->h_mnt = NULL; | |
86dc4139 AM |
21342 | + |
21343 | + p->h_dentry = NULL; | |
21344 | + p->h_parent = NULL; | |
21345 | + p->br = NULL; | |
21346 | + p->task = current; | |
4a4d8108 AM |
21347 | +} |
21348 | + | |
21349 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
21350 | + unsigned int udba, unsigned char flags) | |
21351 | +{ | |
21352 | + au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2, | |
21353 | + udba, flags); | |
21354 | + return au_do_pin(pin); | |
21355 | +} | |
21356 | + | |
dece6358 AM |
21357 | +/* ---------------------------------------------------------------------- */ |
21358 | + | |
1308ab2a | 21359 | +/* |
4a4d8108 AM |
21360 | + * ->setattr() and ->getattr() are called in various cases. |
21361 | + * chmod, stat: dentry is revalidated. | |
21362 | + * fchmod, fstat: file and dentry are not revalidated, additionally they may be | |
21363 | + * unhashed. | |
21364 | + * for ->setattr(), ia->ia_file is passed from ftruncate only. | |
1308ab2a | 21365 | + */ |
027c5e7a | 21366 | +/* todo: consolidate with do_refresh() and simple_reval_dpath() */ |
c1595e42 | 21367 | +int au_reval_for_attr(struct dentry *dentry, unsigned int sigen) |
1facf9fc | 21368 | +{ |
4a4d8108 | 21369 | + int err; |
4a4d8108 | 21370 | + struct dentry *parent; |
1facf9fc | 21371 | + |
1308ab2a | 21372 | + err = 0; |
027c5e7a | 21373 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 AM |
21374 | + parent = dget_parent(dentry); |
21375 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 21376 | + err = au_refresh_dentry(dentry, parent); |
4a4d8108 AM |
21377 | + di_read_unlock(parent, AuLock_IR); |
21378 | + dput(parent); | |
dece6358 | 21379 | + } |
1facf9fc | 21380 | + |
4a4d8108 | 21381 | + AuTraceErr(err); |
1308ab2a | 21382 | + return err; |
21383 | +} | |
dece6358 | 21384 | + |
c1595e42 JR |
21385 | +int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, |
21386 | + struct au_icpup_args *a) | |
1308ab2a | 21387 | +{ |
21388 | + int err; | |
4a4d8108 | 21389 | + loff_t sz; |
5afbbe0d | 21390 | + aufs_bindex_t btop, ibtop; |
4a4d8108 AM |
21391 | + struct dentry *hi_wh, *parent; |
21392 | + struct inode *inode; | |
4a4d8108 AM |
21393 | + struct au_wr_dir_args wr_dir_args = { |
21394 | + .force_btgt = -1, | |
21395 | + .flags = 0 | |
21396 | + }; | |
21397 | + | |
2000de60 | 21398 | + if (d_is_dir(dentry)) |
4a4d8108 AM |
21399 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); |
21400 | + /* plink or hi_wh() case */ | |
5afbbe0d | 21401 | + btop = au_dbtop(dentry); |
5527c038 | 21402 | + inode = d_inode(dentry); |
5afbbe0d AM |
21403 | + ibtop = au_ibtop(inode); |
21404 | + if (btop != ibtop && !au_test_ro(inode->i_sb, ibtop, inode)) | |
21405 | + wr_dir_args.force_btgt = ibtop; | |
4a4d8108 AM |
21406 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
21407 | + if (unlikely(err < 0)) | |
21408 | + goto out; | |
21409 | + a->btgt = err; | |
5afbbe0d | 21410 | + if (err != btop) |
4a4d8108 AM |
21411 | + au_fset_icpup(a->flags, DID_CPUP); |
21412 | + | |
21413 | + err = 0; | |
21414 | + a->pin_flags = AuPin_MNT_WRITE; | |
21415 | + parent = NULL; | |
21416 | + if (!IS_ROOT(dentry)) { | |
21417 | + au_fset_pin(a->pin_flags, DI_LOCKED); | |
21418 | + parent = dget_parent(dentry); | |
21419 | + di_write_lock_parent(parent); | |
21420 | + } | |
21421 | + | |
21422 | + err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags); | |
21423 | + if (unlikely(err)) | |
21424 | + goto out_parent; | |
21425 | + | |
4a4d8108 | 21426 | + sz = -1; |
5afbbe0d | 21427 | + a->h_path.dentry = au_h_dptr(dentry, btop); |
5527c038 | 21428 | + a->h_inode = d_inode(a->h_path.dentry); |
c1595e42 | 21429 | + if (ia && (ia->ia_valid & ATTR_SIZE)) { |
be118d29 | 21430 | + inode_lock_shared_nested(a->h_inode, AuLsc_I_CHILD); |
c1595e42 JR |
21431 | + if (ia->ia_size < i_size_read(a->h_inode)) |
21432 | + sz = ia->ia_size; | |
3c1bdaff | 21433 | + inode_unlock_shared(a->h_inode); |
c1595e42 | 21434 | + } |
4a4d8108 | 21435 | + |
4a4d8108 | 21436 | + hi_wh = NULL; |
027c5e7a | 21437 | + if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) { |
4a4d8108 AM |
21438 | + hi_wh = au_hi_wh(inode, a->btgt); |
21439 | + if (!hi_wh) { | |
c2b27bf2 AM |
21440 | + struct au_cp_generic cpg = { |
21441 | + .dentry = dentry, | |
21442 | + .bdst = a->btgt, | |
21443 | + .bsrc = -1, | |
21444 | + .len = sz, | |
21445 | + .pin = &a->pin | |
21446 | + }; | |
21447 | + err = au_sio_cpup_wh(&cpg, /*file*/NULL); | |
4a4d8108 AM |
21448 | + if (unlikely(err)) |
21449 | + goto out_unlock; | |
21450 | + hi_wh = au_hi_wh(inode, a->btgt); | |
21451 | + /* todo: revalidate hi_wh? */ | |
21452 | + } | |
21453 | + } | |
21454 | + | |
21455 | + if (parent) { | |
21456 | + au_pin_set_parent_lflag(&a->pin, /*lflag*/0); | |
21457 | + di_downgrade_lock(parent, AuLock_IR); | |
21458 | + dput(parent); | |
21459 | + parent = NULL; | |
21460 | + } | |
21461 | + if (!au_ftest_icpup(a->flags, DID_CPUP)) | |
21462 | + goto out; /* success */ | |
21463 | + | |
21464 | + if (!d_unhashed(dentry)) { | |
c2b27bf2 AM |
21465 | + struct au_cp_generic cpg = { |
21466 | + .dentry = dentry, | |
21467 | + .bdst = a->btgt, | |
5afbbe0d | 21468 | + .bsrc = btop, |
c2b27bf2 AM |
21469 | + .len = sz, |
21470 | + .pin = &a->pin, | |
21471 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
21472 | + }; | |
21473 | + err = au_sio_cpup_simple(&cpg); | |
4a4d8108 AM |
21474 | + if (!err) |
21475 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
21476 | + } else if (!hi_wh) | |
21477 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
21478 | + else | |
21479 | + a->h_path.dentry = hi_wh; /* do not dget here */ | |
1308ab2a | 21480 | + |
4f0767ce | 21481 | +out_unlock: |
5527c038 | 21482 | + a->h_inode = d_inode(a->h_path.dentry); |
86dc4139 | 21483 | + if (!err) |
dece6358 | 21484 | + goto out; /* success */ |
4a4d8108 | 21485 | + au_unpin(&a->pin); |
4f0767ce | 21486 | +out_parent: |
4a4d8108 AM |
21487 | + if (parent) { |
21488 | + di_write_unlock(parent); | |
21489 | + dput(parent); | |
21490 | + } | |
4f0767ce | 21491 | +out: |
86dc4139 | 21492 | + if (!err) |
febd17d6 | 21493 | + inode_lock_nested(a->h_inode, AuLsc_I_CHILD); |
1facf9fc | 21494 | + return err; |
21495 | +} | |
21496 | + | |
4a4d8108 | 21497 | +static int aufs_setattr(struct dentry *dentry, struct iattr *ia) |
1facf9fc | 21498 | +{ |
4a4d8108 | 21499 | + int err; |
523b37e3 | 21500 | + struct inode *inode, *delegated; |
4a4d8108 AM |
21501 | + struct super_block *sb; |
21502 | + struct file *file; | |
21503 | + struct au_icpup_args *a; | |
1facf9fc | 21504 | + |
5527c038 | 21505 | + inode = d_inode(dentry); |
4a4d8108 | 21506 | + IMustLock(inode); |
dece6358 | 21507 | + |
f2c43d5f AM |
21508 | + err = setattr_prepare(dentry, ia); |
21509 | + if (unlikely(err)) | |
21510 | + goto out; | |
21511 | + | |
4a4d8108 AM |
21512 | + err = -ENOMEM; |
21513 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
21514 | + if (unlikely(!a)) | |
21515 | + goto out; | |
1facf9fc | 21516 | + |
4a4d8108 AM |
21517 | + if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
21518 | + ia->ia_valid &= ~ATTR_MODE; | |
dece6358 | 21519 | + |
4a4d8108 AM |
21520 | + file = NULL; |
21521 | + sb = dentry->d_sb; | |
e49829fe JR |
21522 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
21523 | + if (unlikely(err)) | |
21524 | + goto out_kfree; | |
21525 | + | |
4a4d8108 AM |
21526 | + if (ia->ia_valid & ATTR_FILE) { |
21527 | + /* currently ftruncate(2) only */ | |
7e9cd9fe | 21528 | + AuDebugOn(!d_is_reg(dentry)); |
4a4d8108 | 21529 | + file = ia->ia_file; |
521ced18 JR |
21530 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1, |
21531 | + /*fi_lsc*/0); | |
4a4d8108 AM |
21532 | + if (unlikely(err)) |
21533 | + goto out_si; | |
21534 | + ia->ia_file = au_hf_top(file); | |
21535 | + a->udba = AuOpt_UDBA_NONE; | |
21536 | + } else { | |
21537 | + /* fchmod() doesn't pass ia_file */ | |
21538 | + a->udba = au_opt_udba(sb); | |
027c5e7a AM |
21539 | + di_write_lock_child(dentry); |
21540 | + /* no d_unlinked(), to set UDBA_NONE for root */ | |
4a4d8108 AM |
21541 | + if (d_unhashed(dentry)) |
21542 | + a->udba = AuOpt_UDBA_NONE; | |
4a4d8108 AM |
21543 | + if (a->udba != AuOpt_UDBA_NONE) { |
21544 | + AuDebugOn(IS_ROOT(dentry)); | |
21545 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
21546 | + if (unlikely(err)) | |
21547 | + goto out_dentry; | |
21548 | + } | |
dece6358 | 21549 | + } |
dece6358 | 21550 | + |
4a4d8108 AM |
21551 | + err = au_pin_and_icpup(dentry, ia, a); |
21552 | + if (unlikely(err < 0)) | |
21553 | + goto out_dentry; | |
21554 | + if (au_ftest_icpup(a->flags, DID_CPUP)) { | |
21555 | + ia->ia_file = NULL; | |
21556 | + ia->ia_valid &= ~ATTR_FILE; | |
1308ab2a | 21557 | + } |
dece6358 | 21558 | + |
4a4d8108 AM |
21559 | + a->h_path.mnt = au_sbr_mnt(sb, a->btgt); |
21560 | + if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME)) | |
21561 | + == (ATTR_MODE | ATTR_CTIME)) { | |
7eafdf33 | 21562 | + err = security_path_chmod(&a->h_path, ia->ia_mode); |
4a4d8108 AM |
21563 | + if (unlikely(err)) |
21564 | + goto out_unlock; | |
21565 | + } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID)) | |
21566 | + && (ia->ia_valid & ATTR_CTIME)) { | |
86dc4139 | 21567 | + err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid); |
4a4d8108 AM |
21568 | + if (unlikely(err)) |
21569 | + goto out_unlock; | |
21570 | + } | |
dece6358 | 21571 | + |
4a4d8108 AM |
21572 | + if (ia->ia_valid & ATTR_SIZE) { |
21573 | + struct file *f; | |
1308ab2a | 21574 | + |
953406b4 | 21575 | + if (ia->ia_size < i_size_read(inode)) |
4a4d8108 | 21576 | + /* unmap only */ |
953406b4 | 21577 | + truncate_setsize(inode, ia->ia_size); |
1308ab2a | 21578 | + |
4a4d8108 AM |
21579 | + f = NULL; |
21580 | + if (ia->ia_valid & ATTR_FILE) | |
21581 | + f = ia->ia_file; | |
febd17d6 | 21582 | + inode_unlock(a->h_inode); |
4a4d8108 | 21583 | + err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f); |
febd17d6 | 21584 | + inode_lock_nested(a->h_inode, AuLsc_I_CHILD); |
523b37e3 AM |
21585 | + } else { |
21586 | + delegated = NULL; | |
21587 | + while (1) { | |
21588 | + err = vfsub_notify_change(&a->h_path, ia, &delegated); | |
21589 | + if (delegated) { | |
21590 | + err = break_deleg_wait(&delegated); | |
21591 | + if (!err) | |
21592 | + continue; | |
21593 | + } | |
21594 | + break; | |
21595 | + } | |
21596 | + } | |
8cdd5066 JR |
21597 | + /* |
21598 | + * regardless aufs 'acl' option setting. | |
21599 | + * why don't all acl-aware fs call this func from their ->setattr()? | |
21600 | + */ | |
21601 | + if (!err && (ia->ia_valid & ATTR_MODE)) | |
21602 | + err = vfsub_acl_chmod(a->h_inode, ia->ia_mode); | |
4a4d8108 AM |
21603 | + if (!err) |
21604 | + au_cpup_attr_changeable(inode); | |
1308ab2a | 21605 | + |
4f0767ce | 21606 | +out_unlock: |
febd17d6 | 21607 | + inode_unlock(a->h_inode); |
4a4d8108 | 21608 | + au_unpin(&a->pin); |
027c5e7a | 21609 | + if (unlikely(err)) |
5afbbe0d | 21610 | + au_update_dbtop(dentry); |
4f0767ce | 21611 | +out_dentry: |
4a4d8108 AM |
21612 | + di_write_unlock(dentry); |
21613 | + if (file) { | |
21614 | + fi_write_unlock(file); | |
21615 | + ia->ia_file = file; | |
21616 | + ia->ia_valid |= ATTR_FILE; | |
21617 | + } | |
4f0767ce | 21618 | +out_si: |
4a4d8108 | 21619 | + si_read_unlock(sb); |
e49829fe | 21620 | +out_kfree: |
1c60b727 | 21621 | + kfree(a); |
4f0767ce | 21622 | +out: |
4a4d8108 AM |
21623 | + AuTraceErr(err); |
21624 | + return err; | |
1facf9fc | 21625 | +} |
21626 | + | |
c1595e42 JR |
21627 | +#if IS_ENABLED(CONFIG_AUFS_XATTR) || IS_ENABLED(CONFIG_FS_POSIX_ACL) |
21628 | +static int au_h_path_to_set_attr(struct dentry *dentry, | |
21629 | + struct au_icpup_args *a, struct path *h_path) | |
21630 | +{ | |
21631 | + int err; | |
21632 | + struct super_block *sb; | |
21633 | + | |
21634 | + sb = dentry->d_sb; | |
21635 | + a->udba = au_opt_udba(sb); | |
21636 | + /* no d_unlinked(), to set UDBA_NONE for root */ | |
21637 | + if (d_unhashed(dentry)) | |
21638 | + a->udba = AuOpt_UDBA_NONE; | |
21639 | + if (a->udba != AuOpt_UDBA_NONE) { | |
21640 | + AuDebugOn(IS_ROOT(dentry)); | |
21641 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
21642 | + if (unlikely(err)) | |
21643 | + goto out; | |
21644 | + } | |
21645 | + err = au_pin_and_icpup(dentry, /*ia*/NULL, a); | |
21646 | + if (unlikely(err < 0)) | |
21647 | + goto out; | |
21648 | + | |
21649 | + h_path->dentry = a->h_path.dentry; | |
21650 | + h_path->mnt = au_sbr_mnt(sb, a->btgt); | |
21651 | + | |
21652 | +out: | |
21653 | + return err; | |
21654 | +} | |
21655 | + | |
f2c43d5f AM |
21656 | +ssize_t au_sxattr(struct dentry *dentry, struct inode *inode, |
21657 | + struct au_sxattr *arg) | |
c1595e42 JR |
21658 | +{ |
21659 | + int err; | |
21660 | + struct path h_path; | |
21661 | + struct super_block *sb; | |
21662 | + struct au_icpup_args *a; | |
5afbbe0d | 21663 | + struct inode *h_inode; |
c1595e42 | 21664 | + |
c1595e42 JR |
21665 | + IMustLock(inode); |
21666 | + | |
21667 | + err = -ENOMEM; | |
21668 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
21669 | + if (unlikely(!a)) | |
21670 | + goto out; | |
21671 | + | |
21672 | + sb = dentry->d_sb; | |
21673 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
21674 | + if (unlikely(err)) | |
21675 | + goto out_kfree; | |
21676 | + | |
21677 | + h_path.dentry = NULL; /* silence gcc */ | |
21678 | + di_write_lock_child(dentry); | |
21679 | + err = au_h_path_to_set_attr(dentry, a, &h_path); | |
21680 | + if (unlikely(err)) | |
21681 | + goto out_di; | |
21682 | + | |
febd17d6 | 21683 | + inode_unlock(a->h_inode); |
c1595e42 JR |
21684 | + switch (arg->type) { |
21685 | + case AU_XATTR_SET: | |
5afbbe0d | 21686 | + AuDebugOn(d_is_negative(h_path.dentry)); |
c1595e42 JR |
21687 | + err = vfsub_setxattr(h_path.dentry, |
21688 | + arg->u.set.name, arg->u.set.value, | |
21689 | + arg->u.set.size, arg->u.set.flags); | |
21690 | + break; | |
c1595e42 JR |
21691 | + case AU_ACL_SET: |
21692 | + err = -EOPNOTSUPP; | |
5527c038 | 21693 | + h_inode = d_inode(h_path.dentry); |
c1595e42 | 21694 | + if (h_inode->i_op->set_acl) |
f2c43d5f | 21695 | + /* this will call posix_acl_update_mode */ |
c1595e42 JR |
21696 | + err = h_inode->i_op->set_acl(h_inode, |
21697 | + arg->u.acl_set.acl, | |
21698 | + arg->u.acl_set.type); | |
21699 | + break; | |
21700 | + } | |
21701 | + if (!err) | |
21702 | + au_cpup_attr_timesizes(inode); | |
21703 | + | |
21704 | + au_unpin(&a->pin); | |
21705 | + if (unlikely(err)) | |
5afbbe0d | 21706 | + au_update_dbtop(dentry); |
c1595e42 JR |
21707 | + |
21708 | +out_di: | |
21709 | + di_write_unlock(dentry); | |
21710 | + si_read_unlock(sb); | |
21711 | +out_kfree: | |
1c60b727 | 21712 | + kfree(a); |
c1595e42 JR |
21713 | +out: |
21714 | + AuTraceErr(err); | |
21715 | + return err; | |
21716 | +} | |
21717 | +#endif | |
21718 | + | |
4a4d8108 AM |
21719 | +static void au_refresh_iattr(struct inode *inode, struct kstat *st, |
21720 | + unsigned int nlink) | |
1facf9fc | 21721 | +{ |
9dbd164d AM |
21722 | + unsigned int n; |
21723 | + | |
4a4d8108 | 21724 | + inode->i_mode = st->mode; |
86dc4139 AM |
21725 | + /* don't i_[ug]id_write() here */ |
21726 | + inode->i_uid = st->uid; | |
21727 | + inode->i_gid = st->gid; | |
4a4d8108 AM |
21728 | + inode->i_atime = st->atime; |
21729 | + inode->i_mtime = st->mtime; | |
21730 | + inode->i_ctime = st->ctime; | |
1facf9fc | 21731 | + |
4a4d8108 AM |
21732 | + au_cpup_attr_nlink(inode, /*force*/0); |
21733 | + if (S_ISDIR(inode->i_mode)) { | |
9dbd164d AM |
21734 | + n = inode->i_nlink; |
21735 | + n -= nlink; | |
21736 | + n += st->nlink; | |
f6b6e03d | 21737 | + smp_mb(); /* for i_nlink */ |
7eafdf33 | 21738 | + /* 0 can happen */ |
92d182d2 | 21739 | + set_nlink(inode, n); |
4a4d8108 | 21740 | + } |
1facf9fc | 21741 | + |
4a4d8108 AM |
21742 | + spin_lock(&inode->i_lock); |
21743 | + inode->i_blocks = st->blocks; | |
21744 | + i_size_write(inode, st->size); | |
21745 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 21746 | +} |
21747 | + | |
c1595e42 | 21748 | +/* |
f2c43d5f | 21749 | + * common routine for aufs_getattr() and au_getxattr(). |
c1595e42 JR |
21750 | + * returns zero or negative (an error). |
21751 | + * @dentry will be read-locked in success. | |
21752 | + */ | |
a2654f78 AM |
21753 | +int au_h_path_getattr(struct dentry *dentry, int force, struct path *h_path, |
21754 | + int locked) | |
1facf9fc | 21755 | +{ |
4a4d8108 | 21756 | + int err; |
076b876e | 21757 | + unsigned int mnt_flags, sigen; |
c1595e42 | 21758 | + unsigned char udba_none; |
4a4d8108 | 21759 | + aufs_bindex_t bindex; |
4a4d8108 AM |
21760 | + struct super_block *sb, *h_sb; |
21761 | + struct inode *inode; | |
1facf9fc | 21762 | + |
c1595e42 JR |
21763 | + h_path->mnt = NULL; |
21764 | + h_path->dentry = NULL; | |
21765 | + | |
21766 | + err = 0; | |
4a4d8108 | 21767 | + sb = dentry->d_sb; |
4a4d8108 AM |
21768 | + mnt_flags = au_mntflags(sb); |
21769 | + udba_none = !!au_opt_test(mnt_flags, UDBA_NONE); | |
1facf9fc | 21770 | + |
a2654f78 AM |
21771 | + if (unlikely(locked)) |
21772 | + goto body; /* skip locking dinfo */ | |
21773 | + | |
4a4d8108 | 21774 | + /* support fstat(2) */ |
027c5e7a | 21775 | + if (!d_unlinked(dentry) && !udba_none) { |
076b876e | 21776 | + sigen = au_sigen(sb); |
027c5e7a AM |
21777 | + err = au_digen_test(dentry, sigen); |
21778 | + if (!err) { | |
4a4d8108 | 21779 | + di_read_lock_child(dentry, AuLock_IR); |
027c5e7a | 21780 | + err = au_dbrange_test(dentry); |
c1595e42 JR |
21781 | + if (unlikely(err)) { |
21782 | + di_read_unlock(dentry, AuLock_IR); | |
21783 | + goto out; | |
21784 | + } | |
027c5e7a | 21785 | + } else { |
4a4d8108 AM |
21786 | + AuDebugOn(IS_ROOT(dentry)); |
21787 | + di_write_lock_child(dentry); | |
027c5e7a AM |
21788 | + err = au_dbrange_test(dentry); |
21789 | + if (!err) | |
21790 | + err = au_reval_for_attr(dentry, sigen); | |
c1595e42 JR |
21791 | + if (!err) |
21792 | + di_downgrade_lock(dentry, AuLock_IR); | |
21793 | + else { | |
21794 | + di_write_unlock(dentry); | |
21795 | + goto out; | |
21796 | + } | |
4a4d8108 AM |
21797 | + } |
21798 | + } else | |
21799 | + di_read_lock_child(dentry, AuLock_IR); | |
1facf9fc | 21800 | + |
a2654f78 | 21801 | +body: |
5527c038 | 21802 | + inode = d_inode(dentry); |
5afbbe0d | 21803 | + bindex = au_ibtop(inode); |
c1595e42 JR |
21804 | + h_path->mnt = au_sbr_mnt(sb, bindex); |
21805 | + h_sb = h_path->mnt->mnt_sb; | |
21806 | + if (!force | |
21807 | + && !au_test_fs_bad_iattr(h_sb) | |
21808 | + && udba_none) | |
21809 | + goto out; /* success */ | |
1facf9fc | 21810 | + |
5afbbe0d | 21811 | + if (au_dbtop(dentry) == bindex) |
c1595e42 | 21812 | + h_path->dentry = au_h_dptr(dentry, bindex); |
4a4d8108 | 21813 | + else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) { |
c1595e42 JR |
21814 | + h_path->dentry = au_plink_lkup(inode, bindex); |
21815 | + if (IS_ERR(h_path->dentry)) | |
21816 | + /* pretending success */ | |
21817 | + h_path->dentry = NULL; | |
21818 | + else | |
21819 | + dput(h_path->dentry); | |
4a4d8108 | 21820 | + } |
c1595e42 JR |
21821 | + |
21822 | +out: | |
21823 | + return err; | |
21824 | +} | |
21825 | + | |
521ced18 JR |
21826 | +static int aufs_getattr(const struct path *path, struct kstat *st, |
21827 | + u32 request, unsigned int query) | |
c1595e42 JR |
21828 | +{ |
21829 | + int err; | |
21830 | + unsigned char positive; | |
21831 | + struct path h_path; | |
521ced18 | 21832 | + struct dentry *dentry; |
c1595e42 JR |
21833 | + struct inode *inode; |
21834 | + struct super_block *sb; | |
21835 | + | |
521ced18 | 21836 | + dentry = path->dentry; |
5527c038 | 21837 | + inode = d_inode(dentry); |
c1595e42 JR |
21838 | + sb = dentry->d_sb; |
21839 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
21840 | + if (unlikely(err)) | |
21841 | + goto out; | |
a2654f78 | 21842 | + err = au_h_path_getattr(dentry, /*force*/0, &h_path, /*locked*/0); |
c1595e42 JR |
21843 | + if (unlikely(err)) |
21844 | + goto out_si; | |
c06a8ce3 | 21845 | + if (unlikely(!h_path.dentry)) |
c1595e42 | 21846 | + /* illegally overlapped or something */ |
4a4d8108 AM |
21847 | + goto out_fill; /* pretending success */ |
21848 | + | |
5527c038 | 21849 | + positive = d_is_positive(h_path.dentry); |
4a4d8108 | 21850 | + if (positive) |
521ced18 JR |
21851 | + /* no vfsub version */ |
21852 | + err = vfs_getattr(&h_path, st, request, query); | |
4a4d8108 AM |
21853 | + if (!err) { |
21854 | + if (positive) | |
c06a8ce3 | 21855 | + au_refresh_iattr(inode, st, |
5527c038 | 21856 | + d_inode(h_path.dentry)->i_nlink); |
4a4d8108 | 21857 | + goto out_fill; /* success */ |
1facf9fc | 21858 | + } |
7f207e10 | 21859 | + AuTraceErr(err); |
c1595e42 | 21860 | + goto out_di; |
4a4d8108 | 21861 | + |
4f0767ce | 21862 | +out_fill: |
4a4d8108 | 21863 | + generic_fillattr(inode, st); |
c1595e42 | 21864 | +out_di: |
4a4d8108 | 21865 | + di_read_unlock(dentry, AuLock_IR); |
c1595e42 | 21866 | +out_si: |
4a4d8108 | 21867 | + si_read_unlock(sb); |
7f207e10 AM |
21868 | +out: |
21869 | + AuTraceErr(err); | |
4a4d8108 | 21870 | + return err; |
1facf9fc | 21871 | +} |
21872 | + | |
21873 | +/* ---------------------------------------------------------------------- */ | |
21874 | + | |
febd17d6 JR |
21875 | +static const char *aufs_get_link(struct dentry *dentry, struct inode *inode, |
21876 | + struct delayed_call *done) | |
4a4d8108 | 21877 | +{ |
c2c0f25c | 21878 | + const char *ret; |
c2c0f25c | 21879 | + struct dentry *h_dentry; |
febd17d6 | 21880 | + struct inode *h_inode; |
4a4d8108 | 21881 | + int err; |
c2c0f25c | 21882 | + aufs_bindex_t bindex; |
1facf9fc | 21883 | + |
79b8bda9 | 21884 | + ret = NULL; /* suppress a warning */ |
febd17d6 JR |
21885 | + err = -ECHILD; |
21886 | + if (!dentry) | |
21887 | + goto out; | |
21888 | + | |
027c5e7a AM |
21889 | + err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN); |
21890 | + if (unlikely(err)) | |
c2c0f25c | 21891 | + goto out; |
027c5e7a AM |
21892 | + |
21893 | + err = au_d_hashed_positive(dentry); | |
c2c0f25c AM |
21894 | + if (unlikely(err)) |
21895 | + goto out_unlock; | |
21896 | + | |
21897 | + err = -EINVAL; | |
21898 | + inode = d_inode(dentry); | |
5afbbe0d | 21899 | + bindex = au_ibtop(inode); |
c2c0f25c | 21900 | + h_inode = au_h_iptr(inode, bindex); |
febd17d6 | 21901 | + if (unlikely(!h_inode->i_op->get_link)) |
c2c0f25c AM |
21902 | + goto out_unlock; |
21903 | + | |
21904 | + err = -EBUSY; | |
21905 | + h_dentry = NULL; | |
5afbbe0d | 21906 | + if (au_dbtop(dentry) <= bindex) { |
c2c0f25c AM |
21907 | + h_dentry = au_h_dptr(dentry, bindex); |
21908 | + if (h_dentry) | |
21909 | + dget(h_dentry); | |
027c5e7a | 21910 | + } |
c2c0f25c AM |
21911 | + if (!h_dentry) { |
21912 | + h_dentry = d_find_any_alias(h_inode); | |
21913 | + if (IS_ERR(h_dentry)) { | |
21914 | + err = PTR_ERR(h_dentry); | |
febd17d6 | 21915 | + goto out_unlock; |
c2c0f25c AM |
21916 | + } |
21917 | + } | |
21918 | + if (unlikely(!h_dentry)) | |
febd17d6 | 21919 | + goto out_unlock; |
1facf9fc | 21920 | + |
c2c0f25c | 21921 | + err = 0; |
062440b3 | 21922 | + AuDbg("%ps\n", h_inode->i_op->get_link); |
c2c0f25c | 21923 | + AuDbgDentry(h_dentry); |
f2c43d5f | 21924 | + ret = vfs_get_link(h_dentry, done); |
c2c0f25c | 21925 | + dput(h_dentry); |
febd17d6 JR |
21926 | + if (IS_ERR(ret)) |
21927 | + err = PTR_ERR(ret); | |
c2c0f25c | 21928 | + |
c2c0f25c AM |
21929 | +out_unlock: |
21930 | + aufs_read_unlock(dentry, AuLock_IR); | |
4f0767ce | 21931 | +out: |
c2c0f25c AM |
21932 | + if (unlikely(err)) |
21933 | + ret = ERR_PTR(err); | |
21934 | + AuTraceErrPtr(ret); | |
21935 | + return ret; | |
4a4d8108 | 21936 | +} |
1facf9fc | 21937 | + |
4a4d8108 | 21938 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 21939 | + |
e2f27e51 AM |
21940 | +static int au_is_special(struct inode *inode) |
21941 | +{ | |
21942 | + return (inode->i_mode & (S_IFBLK | S_IFCHR | S_IFIFO | S_IFSOCK)); | |
21943 | +} | |
21944 | + | |
cd7a4cd9 | 21945 | +static int aufs_update_time(struct inode *inode, struct timespec64 *ts, int flags) |
4a4d8108 | 21946 | +{ |
0c3ec466 | 21947 | + int err; |
e2f27e51 | 21948 | + aufs_bindex_t bindex; |
0c3ec466 AM |
21949 | + struct super_block *sb; |
21950 | + struct inode *h_inode; | |
e2f27e51 | 21951 | + struct vfsmount *h_mnt; |
0c3ec466 AM |
21952 | + |
21953 | + sb = inode->i_sb; | |
e2f27e51 AM |
21954 | + WARN_ONCE((flags & S_ATIME) && !IS_NOATIME(inode), |
21955 | + "unexpected s_flags 0x%lx", sb->s_flags); | |
21956 | + | |
0c3ec466 AM |
21957 | + /* mmap_sem might be acquired already, cf. aufs_mmap() */ |
21958 | + lockdep_off(); | |
21959 | + si_read_lock(sb, AuLock_FLUSH); | |
21960 | + ii_write_lock_child(inode); | |
e2f27e51 AM |
21961 | + |
21962 | + err = 0; | |
21963 | + bindex = au_ibtop(inode); | |
21964 | + h_inode = au_h_iptr(inode, bindex); | |
21965 | + if (!au_test_ro(sb, bindex, inode)) { | |
21966 | + h_mnt = au_sbr_mnt(sb, bindex); | |
21967 | + err = vfsub_mnt_want_write(h_mnt); | |
21968 | + if (!err) { | |
21969 | + err = vfsub_update_time(h_inode, ts, flags); | |
21970 | + vfsub_mnt_drop_write(h_mnt); | |
21971 | + } | |
21972 | + } else if (au_is_special(h_inode)) { | |
21973 | + /* | |
21974 | + * Never copy-up here. | |
21975 | + * These special files may already be opened and used for | |
21976 | + * communicating. If we copied it up, then the communication | |
21977 | + * would be corrupted. | |
21978 | + */ | |
21979 | + AuWarn1("timestamps for i%lu are ignored " | |
21980 | + "since it is on readonly branch (hi%lu).\n", | |
21981 | + inode->i_ino, h_inode->i_ino); | |
21982 | + } else if (flags & ~S_ATIME) { | |
21983 | + err = -EIO; | |
21984 | + AuIOErr1("unexpected flags 0x%x\n", flags); | |
21985 | + AuDebugOn(1); | |
21986 | + } | |
21987 | + | |
38d290e6 JR |
21988 | + if (!err) |
21989 | + au_cpup_attr_timesizes(inode); | |
0c3ec466 AM |
21990 | + ii_write_unlock(inode); |
21991 | + si_read_unlock(sb); | |
21992 | + lockdep_on(); | |
38d290e6 JR |
21993 | + |
21994 | + if (!err && (flags & S_VERSION)) | |
21995 | + inode_inc_iversion(inode); | |
21996 | + | |
0c3ec466 | 21997 | + return err; |
4a4d8108 | 21998 | +} |
1facf9fc | 21999 | + |
4a4d8108 | 22000 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 22001 | + |
b95c5147 AM |
22002 | +/* no getattr version will be set by module.c:aufs_init() */ |
22003 | +struct inode_operations aufs_iop_nogetattr[AuIop_Last], | |
22004 | + aufs_iop[] = { | |
22005 | + [AuIop_SYMLINK] = { | |
22006 | + .permission = aufs_permission, | |
c1595e42 | 22007 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22008 | + .get_acl = aufs_get_acl, |
22009 | + .set_acl = aufs_set_acl, /* unsupport for symlink? */ | |
c1595e42 JR |
22010 | +#endif |
22011 | + | |
b95c5147 AM |
22012 | + .setattr = aufs_setattr, |
22013 | + .getattr = aufs_getattr, | |
0c3ec466 | 22014 | + |
c1595e42 | 22015 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22016 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22017 | +#endif |
22018 | + | |
febd17d6 | 22019 | + .get_link = aufs_get_link, |
0c3ec466 | 22020 | + |
b95c5147 AM |
22021 | + /* .update_time = aufs_update_time */ |
22022 | + }, | |
22023 | + [AuIop_DIR] = { | |
22024 | + .create = aufs_create, | |
22025 | + .lookup = aufs_lookup, | |
22026 | + .link = aufs_link, | |
22027 | + .unlink = aufs_unlink, | |
22028 | + .symlink = aufs_symlink, | |
22029 | + .mkdir = aufs_mkdir, | |
22030 | + .rmdir = aufs_rmdir, | |
22031 | + .mknod = aufs_mknod, | |
22032 | + .rename = aufs_rename, | |
22033 | + | |
22034 | + .permission = aufs_permission, | |
c1595e42 | 22035 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22036 | + .get_acl = aufs_get_acl, |
22037 | + .set_acl = aufs_set_acl, | |
c1595e42 JR |
22038 | +#endif |
22039 | + | |
b95c5147 AM |
22040 | + .setattr = aufs_setattr, |
22041 | + .getattr = aufs_getattr, | |
0c3ec466 | 22042 | + |
c1595e42 | 22043 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22044 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22045 | +#endif |
22046 | + | |
b95c5147 AM |
22047 | + .update_time = aufs_update_time, |
22048 | + .atomic_open = aufs_atomic_open, | |
22049 | + .tmpfile = aufs_tmpfile | |
22050 | + }, | |
22051 | + [AuIop_OTHER] = { | |
22052 | + .permission = aufs_permission, | |
c1595e42 | 22053 | +#ifdef CONFIG_FS_POSIX_ACL |
b95c5147 AM |
22054 | + .get_acl = aufs_get_acl, |
22055 | + .set_acl = aufs_set_acl, | |
c1595e42 JR |
22056 | +#endif |
22057 | + | |
b95c5147 AM |
22058 | + .setattr = aufs_setattr, |
22059 | + .getattr = aufs_getattr, | |
0c3ec466 | 22060 | + |
c1595e42 | 22061 | +#ifdef CONFIG_AUFS_XATTR |
b95c5147 | 22062 | + .listxattr = aufs_listxattr, |
c1595e42 JR |
22063 | +#endif |
22064 | + | |
b95c5147 AM |
22065 | + .update_time = aufs_update_time |
22066 | + } | |
4a4d8108 | 22067 | +}; |
7f207e10 AM |
22068 | diff -urN /usr/share/empty/fs/aufs/i_op_del.c linux/fs/aufs/i_op_del.c |
22069 | --- /usr/share/empty/fs/aufs/i_op_del.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 22070 | +++ linux/fs/aufs/i_op_del.c 2018-08-12 23:43:05.456791299 +0200 |
062440b3 | 22071 | @@ -0,0 +1,512 @@ |
cd7a4cd9 | 22072 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 22073 | +/* |
b00004a5 | 22074 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 22075 | + * |
22076 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22077 | + * it under the terms of the GNU General Public License as published by | |
22078 | + * the Free Software Foundation; either version 2 of the License, or | |
22079 | + * (at your option) any later version. | |
dece6358 AM |
22080 | + * |
22081 | + * This program is distributed in the hope that it will be useful, | |
22082 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22083 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22084 | + * GNU General Public License for more details. | |
22085 | + * | |
22086 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 22087 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 22088 | + */ |
22089 | + | |
22090 | +/* | |
4a4d8108 | 22091 | + * inode operations (del entry) |
1308ab2a | 22092 | + */ |
dece6358 | 22093 | + |
1308ab2a | 22094 | +#include "aufs.h" |
dece6358 | 22095 | + |
4a4d8108 AM |
22096 | +/* |
22097 | + * decide if a new whiteout for @dentry is necessary or not. | |
22098 | + * when it is necessary, prepare the parent dir for the upper branch whose | |
22099 | + * branch index is @bcpup for creation. the actual creation of the whiteout will | |
22100 | + * be done by caller. | |
22101 | + * return value: | |
22102 | + * 0: wh is unnecessary | |
22103 | + * plus: wh is necessary | |
22104 | + * minus: error | |
22105 | + */ | |
22106 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup) | |
1308ab2a | 22107 | +{ |
4a4d8108 | 22108 | + int need_wh, err; |
5afbbe0d | 22109 | + aufs_bindex_t btop; |
4a4d8108 | 22110 | + struct super_block *sb; |
dece6358 | 22111 | + |
4a4d8108 | 22112 | + sb = dentry->d_sb; |
5afbbe0d | 22113 | + btop = au_dbtop(dentry); |
4a4d8108 | 22114 | + if (*bcpup < 0) { |
5afbbe0d AM |
22115 | + *bcpup = btop; |
22116 | + if (au_test_ro(sb, btop, d_inode(dentry))) { | |
4a4d8108 AM |
22117 | + err = AuWbrCopyup(au_sbi(sb), dentry); |
22118 | + *bcpup = err; | |
22119 | + if (unlikely(err < 0)) | |
22120 | + goto out; | |
22121 | + } | |
22122 | + } else | |
5afbbe0d | 22123 | + AuDebugOn(btop < *bcpup |
5527c038 | 22124 | + || au_test_ro(sb, *bcpup, d_inode(dentry))); |
5afbbe0d | 22125 | + AuDbg("bcpup %d, btop %d\n", *bcpup, btop); |
1308ab2a | 22126 | + |
5afbbe0d | 22127 | + if (*bcpup != btop) { |
4a4d8108 AM |
22128 | + err = au_cpup_dirs(dentry, *bcpup); |
22129 | + if (unlikely(err)) | |
22130 | + goto out; | |
22131 | + need_wh = 1; | |
22132 | + } else { | |
027c5e7a | 22133 | + struct au_dinfo *dinfo, *tmp; |
4a4d8108 | 22134 | + |
027c5e7a AM |
22135 | + need_wh = -ENOMEM; |
22136 | + dinfo = au_di(dentry); | |
22137 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
22138 | + if (tmp) { | |
22139 | + au_di_cp(tmp, dinfo); | |
22140 | + au_di_swap(tmp, dinfo); | |
22141 | + /* returns the number of positive dentries */ | |
5afbbe0d AM |
22142 | + need_wh = au_lkup_dentry(dentry, btop + 1, |
22143 | + /* AuLkup_IGNORE_PERM */ 0); | |
027c5e7a AM |
22144 | + au_di_swap(tmp, dinfo); |
22145 | + au_rw_write_unlock(&tmp->di_rwsem); | |
22146 | + au_di_free(tmp); | |
4a4d8108 AM |
22147 | + } |
22148 | + } | |
22149 | + AuDbg("need_wh %d\n", need_wh); | |
22150 | + err = need_wh; | |
22151 | + | |
4f0767ce | 22152 | +out: |
4a4d8108 | 22153 | + return err; |
1facf9fc | 22154 | +} |
22155 | + | |
4a4d8108 AM |
22156 | +/* |
22157 | + * simple tests for the del-entry operations. | |
22158 | + * following the checks in vfs, plus the parent-child relationship. | |
22159 | + */ | |
22160 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
22161 | + struct dentry *h_parent, int isdir) | |
1facf9fc | 22162 | +{ |
4a4d8108 AM |
22163 | + int err; |
22164 | + umode_t h_mode; | |
22165 | + struct dentry *h_dentry, *h_latest; | |
1308ab2a | 22166 | + struct inode *h_inode; |
1facf9fc | 22167 | + |
4a4d8108 | 22168 | + h_dentry = au_h_dptr(dentry, bindex); |
5527c038 | 22169 | + if (d_really_is_positive(dentry)) { |
4a4d8108 | 22170 | + err = -ENOENT; |
5527c038 JR |
22171 | + if (unlikely(d_is_negative(h_dentry))) |
22172 | + goto out; | |
22173 | + h_inode = d_inode(h_dentry); | |
22174 | + if (unlikely(!h_inode->i_nlink)) | |
4a4d8108 | 22175 | + goto out; |
1facf9fc | 22176 | + |
4a4d8108 AM |
22177 | + h_mode = h_inode->i_mode; |
22178 | + if (!isdir) { | |
22179 | + err = -EISDIR; | |
22180 | + if (unlikely(S_ISDIR(h_mode))) | |
22181 | + goto out; | |
22182 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
22183 | + err = -ENOTDIR; | |
22184 | + goto out; | |
22185 | + } | |
22186 | + } else { | |
22187 | + /* rename(2) case */ | |
22188 | + err = -EIO; | |
5527c038 | 22189 | + if (unlikely(d_is_positive(h_dentry))) |
4a4d8108 AM |
22190 | + goto out; |
22191 | + } | |
1facf9fc | 22192 | + |
4a4d8108 AM |
22193 | + err = -ENOENT; |
22194 | + /* expected parent dir is locked */ | |
22195 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
22196 | + goto out; | |
22197 | + err = 0; | |
22198 | + | |
22199 | + /* | |
22200 | + * rmdir a dir may break the consistency on some filesystem. | |
22201 | + * let's try heavy test. | |
22202 | + */ | |
22203 | + err = -EACCES; | |
076b876e | 22204 | + if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), DIRPERM1) |
5527c038 | 22205 | + && au_test_h_perm(d_inode(h_parent), |
076b876e | 22206 | + MAY_EXEC | MAY_WRITE))) |
4a4d8108 AM |
22207 | + goto out; |
22208 | + | |
076b876e | 22209 | + h_latest = au_sio_lkup_one(&dentry->d_name, h_parent); |
4a4d8108 AM |
22210 | + err = -EIO; |
22211 | + if (IS_ERR(h_latest)) | |
22212 | + goto out; | |
22213 | + if (h_latest == h_dentry) | |
22214 | + err = 0; | |
22215 | + dput(h_latest); | |
22216 | + | |
4f0767ce | 22217 | +out: |
4a4d8108 | 22218 | + return err; |
1308ab2a | 22219 | +} |
1facf9fc | 22220 | + |
4a4d8108 AM |
22221 | +/* |
22222 | + * decide the branch where we operate for @dentry. the branch index will be set | |
22223 | + * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent | |
22224 | + * dir for reverting. | |
22225 | + * when a new whiteout is necessary, create it. | |
22226 | + */ | |
22227 | +static struct dentry* | |
22228 | +lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup, | |
22229 | + struct au_dtime *dt, struct au_pin *pin) | |
1308ab2a | 22230 | +{ |
4a4d8108 AM |
22231 | + struct dentry *wh_dentry; |
22232 | + struct super_block *sb; | |
22233 | + struct path h_path; | |
22234 | + int err, need_wh; | |
22235 | + unsigned int udba; | |
22236 | + aufs_bindex_t bcpup; | |
dece6358 | 22237 | + |
4a4d8108 AM |
22238 | + need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup); |
22239 | + wh_dentry = ERR_PTR(need_wh); | |
22240 | + if (unlikely(need_wh < 0)) | |
22241 | + goto out; | |
22242 | + | |
22243 | + sb = dentry->d_sb; | |
22244 | + udba = au_opt_udba(sb); | |
22245 | + bcpup = *rbcpup; | |
22246 | + err = au_pin(pin, dentry, bcpup, udba, | |
22247 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
22248 | + wh_dentry = ERR_PTR(err); | |
22249 | + if (unlikely(err)) | |
22250 | + goto out; | |
22251 | + | |
22252 | + h_path.dentry = au_pinned_h_parent(pin); | |
22253 | + if (udba != AuOpt_UDBA_NONE | |
5afbbe0d | 22254 | + && au_dbtop(dentry) == bcpup) { |
4a4d8108 AM |
22255 | + err = au_may_del(dentry, bcpup, h_path.dentry, isdir); |
22256 | + wh_dentry = ERR_PTR(err); | |
22257 | + if (unlikely(err)) | |
22258 | + goto out_unpin; | |
22259 | + } | |
22260 | + | |
22261 | + h_path.mnt = au_sbr_mnt(sb, bcpup); | |
22262 | + au_dtime_store(dt, au_pinned_parent(pin), &h_path); | |
22263 | + wh_dentry = NULL; | |
22264 | + if (!need_wh) | |
22265 | + goto out; /* success, no need to create whiteout */ | |
22266 | + | |
22267 | + wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry); | |
22268 | + if (IS_ERR(wh_dentry)) | |
22269 | + goto out_unpin; | |
22270 | + | |
22271 | + /* returns with the parent is locked and wh_dentry is dget-ed */ | |
22272 | + goto out; /* success */ | |
22273 | + | |
4f0767ce | 22274 | +out_unpin: |
4a4d8108 | 22275 | + au_unpin(pin); |
4f0767ce | 22276 | +out: |
4a4d8108 | 22277 | + return wh_dentry; |
1facf9fc | 22278 | +} |
22279 | + | |
4a4d8108 AM |
22280 | +/* |
22281 | + * when removing a dir, rename it to a unique temporary whiteout-ed name first | |
22282 | + * in order to be revertible and save time for removing many child whiteouts | |
22283 | + * under the dir. | |
22284 | + * returns 1 when there are too many child whiteout and caller should remove | |
22285 | + * them asynchronously. returns 0 when the number of children is enough small to | |
22286 | + * remove now or the branch fs is a remote fs. | |
22287 | + * otherwise return an error. | |
22288 | + */ | |
22289 | +static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex, | |
22290 | + struct au_nhash *whlist, struct inode *dir) | |
1facf9fc | 22291 | +{ |
4a4d8108 AM |
22292 | + int rmdir_later, err, dirwh; |
22293 | + struct dentry *h_dentry; | |
22294 | + struct super_block *sb; | |
5527c038 | 22295 | + struct inode *inode; |
4a4d8108 AM |
22296 | + |
22297 | + sb = dentry->d_sb; | |
22298 | + SiMustAnyLock(sb); | |
22299 | + h_dentry = au_h_dptr(dentry, bindex); | |
22300 | + err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex)); | |
22301 | + if (unlikely(err)) | |
22302 | + goto out; | |
22303 | + | |
22304 | + /* stop monitoring */ | |
5527c038 JR |
22305 | + inode = d_inode(dentry); |
22306 | + au_hn_free(au_hi(inode, bindex)); | |
4a4d8108 AM |
22307 | + |
22308 | + if (!au_test_fs_remote(h_dentry->d_sb)) { | |
22309 | + dirwh = au_sbi(sb)->si_dirwh; | |
22310 | + rmdir_later = (dirwh <= 1); | |
22311 | + if (!rmdir_later) | |
22312 | + rmdir_later = au_nhash_test_longer_wh(whlist, bindex, | |
22313 | + dirwh); | |
22314 | + if (rmdir_later) | |
22315 | + return rmdir_later; | |
22316 | + } | |
1facf9fc | 22317 | + |
4a4d8108 AM |
22318 | + err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist); |
22319 | + if (unlikely(err)) { | |
523b37e3 AM |
22320 | + AuIOErr("rmdir %pd, b%d failed, %d. ignored\n", |
22321 | + h_dentry, bindex, err); | |
4a4d8108 AM |
22322 | + err = 0; |
22323 | + } | |
dece6358 | 22324 | + |
4f0767ce | 22325 | +out: |
4a4d8108 AM |
22326 | + AuTraceErr(err); |
22327 | + return err; | |
22328 | +} | |
1308ab2a | 22329 | + |
4a4d8108 AM |
22330 | +/* |
22331 | + * final procedure for deleting a entry. | |
22332 | + * maintain dentry and iattr. | |
22333 | + */ | |
22334 | +static void epilog(struct inode *dir, struct dentry *dentry, | |
22335 | + aufs_bindex_t bindex) | |
22336 | +{ | |
22337 | + struct inode *inode; | |
1308ab2a | 22338 | + |
5527c038 | 22339 | + inode = d_inode(dentry); |
4a4d8108 AM |
22340 | + d_drop(dentry); |
22341 | + inode->i_ctime = dir->i_ctime; | |
1308ab2a | 22342 | + |
b912730e | 22343 | + au_dir_ts(dir, bindex); |
be118d29 | 22344 | + inode_inc_iversion(dir); |
1facf9fc | 22345 | +} |
22346 | + | |
4a4d8108 AM |
22347 | +/* |
22348 | + * when an error happened, remove the created whiteout and revert everything. | |
22349 | + */ | |
7f207e10 AM |
22350 | +static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex, |
22351 | + aufs_bindex_t bwh, struct dentry *wh_dentry, | |
22352 | + struct dentry *dentry, struct au_dtime *dt) | |
1facf9fc | 22353 | +{ |
4a4d8108 AM |
22354 | + int rerr; |
22355 | + struct path h_path = { | |
22356 | + .dentry = wh_dentry, | |
7f207e10 | 22357 | + .mnt = au_sbr_mnt(dir->i_sb, bindex) |
4a4d8108 | 22358 | + }; |
dece6358 | 22359 | + |
7f207e10 | 22360 | + rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry); |
4a4d8108 AM |
22361 | + if (!rerr) { |
22362 | + au_set_dbwh(dentry, bwh); | |
22363 | + au_dtime_revert(dt); | |
22364 | + return 0; | |
22365 | + } | |
dece6358 | 22366 | + |
523b37e3 | 22367 | + AuIOErr("%pd reverting whiteout failed(%d, %d)\n", dentry, err, rerr); |
4a4d8108 | 22368 | + return -EIO; |
1facf9fc | 22369 | +} |
22370 | + | |
4a4d8108 | 22371 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 22372 | + |
4a4d8108 | 22373 | +int aufs_unlink(struct inode *dir, struct dentry *dentry) |
1308ab2a | 22374 | +{ |
4a4d8108 | 22375 | + int err; |
5afbbe0d | 22376 | + aufs_bindex_t bwh, bindex, btop; |
523b37e3 | 22377 | + struct inode *inode, *h_dir, *delegated; |
4a4d8108 | 22378 | + struct dentry *parent, *wh_dentry; |
c2b27bf2 AM |
22379 | + /* to reuduce stack size */ |
22380 | + struct { | |
22381 | + struct au_dtime dt; | |
22382 | + struct au_pin pin; | |
22383 | + struct path h_path; | |
22384 | + } *a; | |
1facf9fc | 22385 | + |
4a4d8108 | 22386 | + IMustLock(dir); |
027c5e7a | 22387 | + |
c2b27bf2 AM |
22388 | + err = -ENOMEM; |
22389 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
22390 | + if (unlikely(!a)) | |
22391 | + goto out; | |
22392 | + | |
027c5e7a AM |
22393 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
22394 | + if (unlikely(err)) | |
c2b27bf2 | 22395 | + goto out_free; |
027c5e7a AM |
22396 | + err = au_d_hashed_positive(dentry); |
22397 | + if (unlikely(err)) | |
22398 | + goto out_unlock; | |
5527c038 | 22399 | + inode = d_inode(dentry); |
4a4d8108 | 22400 | + IMustLock(inode); |
027c5e7a | 22401 | + err = -EISDIR; |
2000de60 | 22402 | + if (unlikely(d_is_dir(dentry))) |
027c5e7a | 22403 | + goto out_unlock; /* possible? */ |
1facf9fc | 22404 | + |
5afbbe0d | 22405 | + btop = au_dbtop(dentry); |
4a4d8108 AM |
22406 | + bwh = au_dbwh(dentry); |
22407 | + bindex = -1; | |
027c5e7a AM |
22408 | + parent = dentry->d_parent; /* dir inode is locked */ |
22409 | + di_write_lock_parent(parent); | |
c2b27bf2 AM |
22410 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &a->dt, |
22411 | + &a->pin); | |
4a4d8108 AM |
22412 | + err = PTR_ERR(wh_dentry); |
22413 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 22414 | + goto out_parent; |
1facf9fc | 22415 | + |
5afbbe0d AM |
22416 | + a->h_path.mnt = au_sbr_mnt(dentry->d_sb, btop); |
22417 | + a->h_path.dentry = au_h_dptr(dentry, btop); | |
c2b27bf2 | 22418 | + dget(a->h_path.dentry); |
5afbbe0d | 22419 | + if (bindex == btop) { |
c2b27bf2 | 22420 | + h_dir = au_pinned_h_dir(&a->pin); |
523b37e3 AM |
22421 | + delegated = NULL; |
22422 | + err = vfsub_unlink(h_dir, &a->h_path, &delegated, /*force*/0); | |
22423 | + if (unlikely(err == -EWOULDBLOCK)) { | |
22424 | + pr_warn("cannot retry for NFSv4 delegation" | |
22425 | + " for an internal unlink\n"); | |
22426 | + iput(delegated); | |
22427 | + } | |
4a4d8108 AM |
22428 | + } else { |
22429 | + /* dir inode is locked */ | |
5527c038 | 22430 | + h_dir = d_inode(wh_dentry->d_parent); |
4a4d8108 AM |
22431 | + IMustLock(h_dir); |
22432 | + err = 0; | |
22433 | + } | |
dece6358 | 22434 | + |
4a4d8108 | 22435 | + if (!err) { |
7f207e10 | 22436 | + vfsub_drop_nlink(inode); |
4a4d8108 AM |
22437 | + epilog(dir, dentry, bindex); |
22438 | + | |
22439 | + /* update target timestamps */ | |
5afbbe0d | 22440 | + if (bindex == btop) { |
c2b27bf2 AM |
22441 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); |
22442 | + /*ignore*/ | |
5527c038 | 22443 | + inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; |
4a4d8108 AM |
22444 | + } else |
22445 | + /* todo: this timestamp may be reverted later */ | |
22446 | + inode->i_ctime = h_dir->i_ctime; | |
027c5e7a | 22447 | + goto out_unpin; /* success */ |
1facf9fc | 22448 | + } |
22449 | + | |
4a4d8108 AM |
22450 | + /* revert */ |
22451 | + if (wh_dentry) { | |
22452 | + int rerr; | |
22453 | + | |
c2b27bf2 AM |
22454 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, |
22455 | + &a->dt); | |
4a4d8108 AM |
22456 | + if (rerr) |
22457 | + err = rerr; | |
dece6358 | 22458 | + } |
1facf9fc | 22459 | + |
027c5e7a | 22460 | +out_unpin: |
c2b27bf2 | 22461 | + au_unpin(&a->pin); |
4a4d8108 | 22462 | + dput(wh_dentry); |
c2b27bf2 | 22463 | + dput(a->h_path.dentry); |
027c5e7a | 22464 | +out_parent: |
4a4d8108 | 22465 | + di_write_unlock(parent); |
027c5e7a | 22466 | +out_unlock: |
4a4d8108 | 22467 | + aufs_read_unlock(dentry, AuLock_DW); |
c2b27bf2 | 22468 | +out_free: |
1c60b727 | 22469 | + kfree(a); |
027c5e7a | 22470 | +out: |
4a4d8108 | 22471 | + return err; |
dece6358 AM |
22472 | +} |
22473 | + | |
4a4d8108 | 22474 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry) |
1308ab2a | 22475 | +{ |
4a4d8108 | 22476 | + int err, rmdir_later; |
5afbbe0d | 22477 | + aufs_bindex_t bwh, bindex, btop; |
4a4d8108 AM |
22478 | + struct inode *inode; |
22479 | + struct dentry *parent, *wh_dentry, *h_dentry; | |
22480 | + struct au_whtmp_rmdir *args; | |
c2b27bf2 AM |
22481 | + /* to reuduce stack size */ |
22482 | + struct { | |
22483 | + struct au_dtime dt; | |
22484 | + struct au_pin pin; | |
22485 | + } *a; | |
1facf9fc | 22486 | + |
4a4d8108 | 22487 | + IMustLock(dir); |
027c5e7a | 22488 | + |
c2b27bf2 AM |
22489 | + err = -ENOMEM; |
22490 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
22491 | + if (unlikely(!a)) | |
22492 | + goto out; | |
22493 | + | |
027c5e7a AM |
22494 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); |
22495 | + if (unlikely(err)) | |
c2b27bf2 | 22496 | + goto out_free; |
53392da6 AM |
22497 | + err = au_alive_dir(dentry); |
22498 | + if (unlikely(err)) | |
027c5e7a | 22499 | + goto out_unlock; |
5527c038 | 22500 | + inode = d_inode(dentry); |
4a4d8108 | 22501 | + IMustLock(inode); |
027c5e7a | 22502 | + err = -ENOTDIR; |
2000de60 | 22503 | + if (unlikely(!d_is_dir(dentry))) |
027c5e7a | 22504 | + goto out_unlock; /* possible? */ |
dece6358 | 22505 | + |
4a4d8108 AM |
22506 | + err = -ENOMEM; |
22507 | + args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS); | |
22508 | + if (unlikely(!args)) | |
22509 | + goto out_unlock; | |
dece6358 | 22510 | + |
4a4d8108 AM |
22511 | + parent = dentry->d_parent; /* dir inode is locked */ |
22512 | + di_write_lock_parent(parent); | |
22513 | + err = au_test_empty(dentry, &args->whlist); | |
22514 | + if (unlikely(err)) | |
027c5e7a | 22515 | + goto out_parent; |
1facf9fc | 22516 | + |
5afbbe0d | 22517 | + btop = au_dbtop(dentry); |
4a4d8108 AM |
22518 | + bwh = au_dbwh(dentry); |
22519 | + bindex = -1; | |
c2b27bf2 AM |
22520 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &a->dt, |
22521 | + &a->pin); | |
4a4d8108 AM |
22522 | + err = PTR_ERR(wh_dentry); |
22523 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 22524 | + goto out_parent; |
1facf9fc | 22525 | + |
5afbbe0d | 22526 | + h_dentry = au_h_dptr(dentry, btop); |
4a4d8108 AM |
22527 | + dget(h_dentry); |
22528 | + rmdir_later = 0; | |
5afbbe0d AM |
22529 | + if (bindex == btop) { |
22530 | + err = renwh_and_rmdir(dentry, btop, &args->whlist, dir); | |
4a4d8108 AM |
22531 | + if (err > 0) { |
22532 | + rmdir_later = err; | |
22533 | + err = 0; | |
22534 | + } | |
22535 | + } else { | |
22536 | + /* stop monitoring */ | |
5afbbe0d | 22537 | + au_hn_free(au_hi(inode, btop)); |
4a4d8108 AM |
22538 | + |
22539 | + /* dir inode is locked */ | |
5527c038 | 22540 | + IMustLock(d_inode(wh_dentry->d_parent)); |
1facf9fc | 22541 | + err = 0; |
22542 | + } | |
22543 | + | |
4a4d8108 | 22544 | + if (!err) { |
027c5e7a | 22545 | + vfsub_dead_dir(inode); |
4a4d8108 AM |
22546 | + au_set_dbdiropq(dentry, -1); |
22547 | + epilog(dir, dentry, bindex); | |
1308ab2a | 22548 | + |
4a4d8108 | 22549 | + if (rmdir_later) { |
5afbbe0d | 22550 | + au_whtmp_kick_rmdir(dir, btop, h_dentry, args); |
4a4d8108 AM |
22551 | + args = NULL; |
22552 | + } | |
1308ab2a | 22553 | + |
4a4d8108 | 22554 | + goto out_unpin; /* success */ |
1facf9fc | 22555 | + } |
22556 | + | |
4a4d8108 AM |
22557 | + /* revert */ |
22558 | + AuLabel(revert); | |
22559 | + if (wh_dentry) { | |
22560 | + int rerr; | |
1308ab2a | 22561 | + |
c2b27bf2 AM |
22562 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, |
22563 | + &a->dt); | |
4a4d8108 AM |
22564 | + if (rerr) |
22565 | + err = rerr; | |
1facf9fc | 22566 | + } |
22567 | + | |
4f0767ce | 22568 | +out_unpin: |
c2b27bf2 | 22569 | + au_unpin(&a->pin); |
4a4d8108 AM |
22570 | + dput(wh_dentry); |
22571 | + dput(h_dentry); | |
027c5e7a | 22572 | +out_parent: |
4a4d8108 AM |
22573 | + di_write_unlock(parent); |
22574 | + if (args) | |
22575 | + au_whtmp_rmdir_free(args); | |
4f0767ce | 22576 | +out_unlock: |
4a4d8108 | 22577 | + aufs_read_unlock(dentry, AuLock_DW); |
c2b27bf2 | 22578 | +out_free: |
1c60b727 | 22579 | + kfree(a); |
4f0767ce | 22580 | +out: |
4a4d8108 AM |
22581 | + AuTraceErr(err); |
22582 | + return err; | |
dece6358 | 22583 | +} |
7f207e10 AM |
22584 | diff -urN /usr/share/empty/fs/aufs/i_op_ren.c linux/fs/aufs/i_op_ren.c |
22585 | --- /usr/share/empty/fs/aufs/i_op_ren.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 22586 | +++ linux/fs/aufs/i_op_ren.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 22587 | @@ -0,0 +1,1247 @@ |
cd7a4cd9 | 22588 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 22589 | +/* |
b00004a5 | 22590 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 22591 | + * |
22592 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22593 | + * it under the terms of the GNU General Public License as published by | |
22594 | + * the Free Software Foundation; either version 2 of the License, or | |
22595 | + * (at your option) any later version. | |
dece6358 AM |
22596 | + * |
22597 | + * This program is distributed in the hope that it will be useful, | |
22598 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22599 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22600 | + * GNU General Public License for more details. | |
22601 | + * | |
22602 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 22603 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 22604 | + */ |
22605 | + | |
22606 | +/* | |
4a4d8108 AM |
22607 | + * inode operation (rename entry) |
22608 | + * todo: this is crazy monster | |
1facf9fc | 22609 | + */ |
22610 | + | |
22611 | +#include "aufs.h" | |
22612 | + | |
4a4d8108 AM |
22613 | +enum { AuSRC, AuDST, AuSrcDst }; |
22614 | +enum { AuPARENT, AuCHILD, AuParentChild }; | |
1facf9fc | 22615 | + |
f2c43d5f AM |
22616 | +#define AuRen_ISDIR_SRC 1 |
22617 | +#define AuRen_ISDIR_DST (1 << 1) | |
22618 | +#define AuRen_ISSAMEDIR (1 << 2) | |
22619 | +#define AuRen_WHSRC (1 << 3) | |
22620 | +#define AuRen_WHDST (1 << 4) | |
22621 | +#define AuRen_MNT_WRITE (1 << 5) | |
22622 | +#define AuRen_DT_DSTDIR (1 << 6) | |
22623 | +#define AuRen_DIROPQ_SRC (1 << 7) | |
22624 | +#define AuRen_DIROPQ_DST (1 << 8) | |
8b6a4947 AM |
22625 | +#define AuRen_DIRREN (1 << 9) |
22626 | +#define AuRen_DROPPED_SRC (1 << 10) | |
22627 | +#define AuRen_DROPPED_DST (1 << 11) | |
4a4d8108 | 22628 | +#define au_ftest_ren(flags, name) ((flags) & AuRen_##name) |
7f207e10 AM |
22629 | +#define au_fset_ren(flags, name) \ |
22630 | + do { (flags) |= AuRen_##name; } while (0) | |
22631 | +#define au_fclr_ren(flags, name) \ | |
22632 | + do { (flags) &= ~AuRen_##name; } while (0) | |
1facf9fc | 22633 | + |
8b6a4947 AM |
22634 | +#ifndef CONFIG_AUFS_DIRREN |
22635 | +#undef AuRen_DIRREN | |
22636 | +#define AuRen_DIRREN 0 | |
22637 | +#endif | |
22638 | + | |
4a4d8108 AM |
22639 | +struct au_ren_args { |
22640 | + struct { | |
22641 | + struct dentry *dentry, *h_dentry, *parent, *h_parent, | |
22642 | + *wh_dentry; | |
22643 | + struct inode *dir, *inode; | |
f2c43d5f | 22644 | + struct au_hinode *hdir, *hinode; |
4a4d8108 | 22645 | + struct au_dtime dt[AuParentChild]; |
f2c43d5f | 22646 | + aufs_bindex_t btop, bdiropq; |
4a4d8108 | 22647 | + } sd[AuSrcDst]; |
1facf9fc | 22648 | + |
4a4d8108 AM |
22649 | +#define src_dentry sd[AuSRC].dentry |
22650 | +#define src_dir sd[AuSRC].dir | |
22651 | +#define src_inode sd[AuSRC].inode | |
22652 | +#define src_h_dentry sd[AuSRC].h_dentry | |
22653 | +#define src_parent sd[AuSRC].parent | |
22654 | +#define src_h_parent sd[AuSRC].h_parent | |
22655 | +#define src_wh_dentry sd[AuSRC].wh_dentry | |
22656 | +#define src_hdir sd[AuSRC].hdir | |
f2c43d5f | 22657 | +#define src_hinode sd[AuSRC].hinode |
4a4d8108 AM |
22658 | +#define src_h_dir sd[AuSRC].hdir->hi_inode |
22659 | +#define src_dt sd[AuSRC].dt | |
5afbbe0d | 22660 | +#define src_btop sd[AuSRC].btop |
f2c43d5f | 22661 | +#define src_bdiropq sd[AuSRC].bdiropq |
1facf9fc | 22662 | + |
4a4d8108 AM |
22663 | +#define dst_dentry sd[AuDST].dentry |
22664 | +#define dst_dir sd[AuDST].dir | |
22665 | +#define dst_inode sd[AuDST].inode | |
22666 | +#define dst_h_dentry sd[AuDST].h_dentry | |
22667 | +#define dst_parent sd[AuDST].parent | |
22668 | +#define dst_h_parent sd[AuDST].h_parent | |
22669 | +#define dst_wh_dentry sd[AuDST].wh_dentry | |
22670 | +#define dst_hdir sd[AuDST].hdir | |
f2c43d5f | 22671 | +#define dst_hinode sd[AuDST].hinode |
4a4d8108 AM |
22672 | +#define dst_h_dir sd[AuDST].hdir->hi_inode |
22673 | +#define dst_dt sd[AuDST].dt | |
5afbbe0d | 22674 | +#define dst_btop sd[AuDST].btop |
f2c43d5f | 22675 | +#define dst_bdiropq sd[AuDST].bdiropq |
4a4d8108 AM |
22676 | + |
22677 | + struct dentry *h_trap; | |
22678 | + struct au_branch *br; | |
4a4d8108 AM |
22679 | + struct path h_path; |
22680 | + struct au_nhash whlist; | |
f2c43d5f | 22681 | + aufs_bindex_t btgt, src_bwh; |
1facf9fc | 22682 | + |
f2c43d5f AM |
22683 | + struct { |
22684 | + unsigned short auren_flags; | |
22685 | + unsigned char flags; /* syscall parameter */ | |
22686 | + unsigned char exchange; | |
22687 | + } __packed; | |
1facf9fc | 22688 | + |
4a4d8108 AM |
22689 | + struct au_whtmp_rmdir *thargs; |
22690 | + struct dentry *h_dst; | |
8b6a4947 | 22691 | + struct au_hinode *h_root; |
4a4d8108 | 22692 | +}; |
1308ab2a | 22693 | + |
4a4d8108 | 22694 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 22695 | + |
4a4d8108 AM |
22696 | +/* |
22697 | + * functions for reverting. | |
22698 | + * when an error happened in a single rename systemcall, we should revert | |
79b8bda9 | 22699 | + * everything as if nothing happened. |
4a4d8108 AM |
22700 | + * we don't need to revert the copied-up/down the parent dir since they are |
22701 | + * harmless. | |
22702 | + */ | |
1facf9fc | 22703 | + |
4a4d8108 AM |
22704 | +#define RevertFailure(fmt, ...) do { \ |
22705 | + AuIOErr("revert failure: " fmt " (%d, %d)\n", \ | |
22706 | + ##__VA_ARGS__, err, rerr); \ | |
22707 | + err = -EIO; \ | |
22708 | +} while (0) | |
1facf9fc | 22709 | + |
f2c43d5f | 22710 | +static void au_ren_do_rev_diropq(int err, struct au_ren_args *a, int idx) |
1facf9fc | 22711 | +{ |
4a4d8108 | 22712 | + int rerr; |
f2c43d5f AM |
22713 | + struct dentry *d; |
22714 | +#define src_or_dst(member) a->sd[idx].member | |
1facf9fc | 22715 | + |
f2c43d5f AM |
22716 | + d = src_or_dst(dentry); /* {src,dst}_dentry */ |
22717 | + au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); | |
22718 | + rerr = au_diropq_remove(d, a->btgt); | |
22719 | + au_hn_inode_unlock(src_or_dst(hinode)); | |
22720 | + au_set_dbdiropq(d, src_or_dst(bdiropq)); | |
4a4d8108 | 22721 | + if (rerr) |
f2c43d5f AM |
22722 | + RevertFailure("remove diropq %pd", d); |
22723 | + | |
22724 | +#undef src_or_dst_ | |
22725 | +} | |
22726 | + | |
22727 | +static void au_ren_rev_diropq(int err, struct au_ren_args *a) | |
22728 | +{ | |
22729 | + if (au_ftest_ren(a->auren_flags, DIROPQ_SRC)) | |
22730 | + au_ren_do_rev_diropq(err, a, AuSRC); | |
22731 | + if (au_ftest_ren(a->auren_flags, DIROPQ_DST)) | |
22732 | + au_ren_do_rev_diropq(err, a, AuDST); | |
4a4d8108 | 22733 | +} |
1facf9fc | 22734 | + |
4a4d8108 AM |
22735 | +static void au_ren_rev_rename(int err, struct au_ren_args *a) |
22736 | +{ | |
22737 | + int rerr; | |
523b37e3 | 22738 | + struct inode *delegated; |
1facf9fc | 22739 | + |
b4510431 AM |
22740 | + a->h_path.dentry = vfsub_lkup_one(&a->src_dentry->d_name, |
22741 | + a->src_h_parent); | |
4a4d8108 AM |
22742 | + rerr = PTR_ERR(a->h_path.dentry); |
22743 | + if (IS_ERR(a->h_path.dentry)) { | |
523b37e3 | 22744 | + RevertFailure("lkup one %pd", a->src_dentry); |
4a4d8108 | 22745 | + return; |
1facf9fc | 22746 | + } |
22747 | + | |
523b37e3 | 22748 | + delegated = NULL; |
4a4d8108 AM |
22749 | + rerr = vfsub_rename(a->dst_h_dir, |
22750 | + au_h_dptr(a->src_dentry, a->btgt), | |
f2c43d5f | 22751 | + a->src_h_dir, &a->h_path, &delegated, a->flags); |
523b37e3 AM |
22752 | + if (unlikely(rerr == -EWOULDBLOCK)) { |
22753 | + pr_warn("cannot retry for NFSv4 delegation" | |
22754 | + " for an internal rename\n"); | |
22755 | + iput(delegated); | |
22756 | + } | |
4a4d8108 AM |
22757 | + d_drop(a->h_path.dentry); |
22758 | + dput(a->h_path.dentry); | |
22759 | + /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */ | |
22760 | + if (rerr) | |
523b37e3 | 22761 | + RevertFailure("rename %pd", a->src_dentry); |
1facf9fc | 22762 | +} |
22763 | + | |
4a4d8108 | 22764 | +static void au_ren_rev_whtmp(int err, struct au_ren_args *a) |
1facf9fc | 22765 | +{ |
4a4d8108 | 22766 | + int rerr; |
523b37e3 | 22767 | + struct inode *delegated; |
dece6358 | 22768 | + |
b4510431 AM |
22769 | + a->h_path.dentry = vfsub_lkup_one(&a->dst_dentry->d_name, |
22770 | + a->dst_h_parent); | |
4a4d8108 AM |
22771 | + rerr = PTR_ERR(a->h_path.dentry); |
22772 | + if (IS_ERR(a->h_path.dentry)) { | |
523b37e3 | 22773 | + RevertFailure("lkup one %pd", a->dst_dentry); |
4a4d8108 AM |
22774 | + return; |
22775 | + } | |
5527c038 | 22776 | + if (d_is_positive(a->h_path.dentry)) { |
4a4d8108 AM |
22777 | + d_drop(a->h_path.dentry); |
22778 | + dput(a->h_path.dentry); | |
22779 | + return; | |
dece6358 AM |
22780 | + } |
22781 | + | |
523b37e3 AM |
22782 | + delegated = NULL; |
22783 | + rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path, | |
f2c43d5f | 22784 | + &delegated, a->flags); |
523b37e3 AM |
22785 | + if (unlikely(rerr == -EWOULDBLOCK)) { |
22786 | + pr_warn("cannot retry for NFSv4 delegation" | |
22787 | + " for an internal rename\n"); | |
22788 | + iput(delegated); | |
22789 | + } | |
4a4d8108 AM |
22790 | + d_drop(a->h_path.dentry); |
22791 | + dput(a->h_path.dentry); | |
22792 | + if (!rerr) | |
22793 | + au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst)); | |
22794 | + else | |
523b37e3 | 22795 | + RevertFailure("rename %pd", a->h_dst); |
4a4d8108 | 22796 | +} |
1308ab2a | 22797 | + |
4a4d8108 AM |
22798 | +static void au_ren_rev_whsrc(int err, struct au_ren_args *a) |
22799 | +{ | |
22800 | + int rerr; | |
1308ab2a | 22801 | + |
4a4d8108 AM |
22802 | + a->h_path.dentry = a->src_wh_dentry; |
22803 | + rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry); | |
027c5e7a | 22804 | + au_set_dbwh(a->src_dentry, a->src_bwh); |
4a4d8108 | 22805 | + if (rerr) |
523b37e3 | 22806 | + RevertFailure("unlink %pd", a->src_wh_dentry); |
4a4d8108 | 22807 | +} |
4a4d8108 | 22808 | +#undef RevertFailure |
1facf9fc | 22809 | + |
1308ab2a | 22810 | +/* ---------------------------------------------------------------------- */ |
22811 | + | |
4a4d8108 AM |
22812 | +/* |
22813 | + * when we have to copyup the renaming entry, do it with the rename-target name | |
22814 | + * in order to minimize the cost (the later actual rename is unnecessary). | |
22815 | + * otherwise rename it on the target branch. | |
22816 | + */ | |
22817 | +static int au_ren_or_cpup(struct au_ren_args *a) | |
1facf9fc | 22818 | +{ |
dece6358 | 22819 | + int err; |
4a4d8108 | 22820 | + struct dentry *d; |
523b37e3 | 22821 | + struct inode *delegated; |
1facf9fc | 22822 | + |
4a4d8108 | 22823 | + d = a->src_dentry; |
5afbbe0d | 22824 | + if (au_dbtop(d) == a->btgt) { |
4a4d8108 | 22825 | + a->h_path.dentry = a->dst_h_dentry; |
5afbbe0d | 22826 | + AuDebugOn(au_dbtop(d) != a->btgt); |
523b37e3 | 22827 | + delegated = NULL; |
4a4d8108 | 22828 | + err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt), |
f2c43d5f AM |
22829 | + a->dst_h_dir, &a->h_path, &delegated, |
22830 | + a->flags); | |
523b37e3 AM |
22831 | + if (unlikely(err == -EWOULDBLOCK)) { |
22832 | + pr_warn("cannot retry for NFSv4 delegation" | |
22833 | + " for an internal rename\n"); | |
22834 | + iput(delegated); | |
22835 | + } | |
c2b27bf2 | 22836 | + } else |
86dc4139 | 22837 | + BUG(); |
1308ab2a | 22838 | + |
027c5e7a AM |
22839 | + if (!err && a->h_dst) |
22840 | + /* it will be set to dinfo later */ | |
22841 | + dget(a->h_dst); | |
1facf9fc | 22842 | + |
dece6358 AM |
22843 | + return err; |
22844 | +} | |
1facf9fc | 22845 | + |
4a4d8108 AM |
22846 | +/* cf. aufs_rmdir() */ |
22847 | +static int au_ren_del_whtmp(struct au_ren_args *a) | |
dece6358 | 22848 | +{ |
4a4d8108 AM |
22849 | + int err; |
22850 | + struct inode *dir; | |
1facf9fc | 22851 | + |
4a4d8108 AM |
22852 | + dir = a->dst_dir; |
22853 | + SiMustAnyLock(dir->i_sb); | |
22854 | + if (!au_nhash_test_longer_wh(&a->whlist, a->btgt, | |
22855 | + au_sbi(dir->i_sb)->si_dirwh) | |
22856 | + || au_test_fs_remote(a->h_dst->d_sb)) { | |
22857 | + err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist); | |
22858 | + if (unlikely(err)) | |
523b37e3 AM |
22859 | + pr_warn("failed removing whtmp dir %pd (%d), " |
22860 | + "ignored.\n", a->h_dst, err); | |
4a4d8108 AM |
22861 | + } else { |
22862 | + au_nhash_wh_free(&a->thargs->whlist); | |
22863 | + a->thargs->whlist = a->whlist; | |
22864 | + a->whlist.nh_num = 0; | |
22865 | + au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs); | |
22866 | + dput(a->h_dst); | |
22867 | + a->thargs = NULL; | |
22868 | + } | |
22869 | + | |
22870 | + return 0; | |
1308ab2a | 22871 | +} |
1facf9fc | 22872 | + |
4a4d8108 | 22873 | +/* make it 'opaque' dir. */ |
f2c43d5f | 22874 | +static int au_ren_do_diropq(struct au_ren_args *a, int idx) |
4a4d8108 AM |
22875 | +{ |
22876 | + int err; | |
f2c43d5f AM |
22877 | + struct dentry *d, *diropq; |
22878 | +#define src_or_dst(member) a->sd[idx].member | |
1facf9fc | 22879 | + |
4a4d8108 | 22880 | + err = 0; |
f2c43d5f AM |
22881 | + d = src_or_dst(dentry); /* {src,dst}_dentry */ |
22882 | + src_or_dst(bdiropq) = au_dbdiropq(d); | |
22883 | + src_or_dst(hinode) = au_hi(src_or_dst(inode), a->btgt); | |
22884 | + au_hn_inode_lock_nested(src_or_dst(hinode), AuLsc_I_CHILD); | |
22885 | + diropq = au_diropq_create(d, a->btgt); | |
22886 | + au_hn_inode_unlock(src_or_dst(hinode)); | |
4a4d8108 AM |
22887 | + if (IS_ERR(diropq)) |
22888 | + err = PTR_ERR(diropq); | |
076b876e AM |
22889 | + else |
22890 | + dput(diropq); | |
1facf9fc | 22891 | + |
f2c43d5f | 22892 | +#undef src_or_dst_ |
4a4d8108 AM |
22893 | + return err; |
22894 | +} | |
1facf9fc | 22895 | + |
f2c43d5f | 22896 | +static int au_ren_diropq(struct au_ren_args *a) |
4a4d8108 AM |
22897 | +{ |
22898 | + int err; | |
f2c43d5f AM |
22899 | + unsigned char always; |
22900 | + struct dentry *d; | |
1facf9fc | 22901 | + |
f2c43d5f AM |
22902 | + err = 0; |
22903 | + d = a->dst_dentry; /* already renamed on the branch */ | |
22904 | + always = !!au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ); | |
22905 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) | |
8b6a4947 | 22906 | + && !au_ftest_ren(a->auren_flags, DIRREN) |
f2c43d5f AM |
22907 | + && a->btgt != au_dbdiropq(a->src_dentry) |
22908 | + && (a->dst_wh_dentry | |
22909 | + || a->btgt <= au_dbdiropq(d) | |
22910 | + /* hide the lower to keep xino */ | |
22911 | + /* the lowers may not be a dir, but we hide them anyway */ | |
22912 | + || a->btgt < au_dbbot(d) | |
22913 | + || always)) { | |
22914 | + AuDbg("here\n"); | |
22915 | + err = au_ren_do_diropq(a, AuSRC); | |
22916 | + if (unlikely(err)) | |
4a4d8108 | 22917 | + goto out; |
f2c43d5f | 22918 | + au_fset_ren(a->auren_flags, DIROPQ_SRC); |
4a4d8108 | 22919 | + } |
f2c43d5f AM |
22920 | + if (!a->exchange) |
22921 | + goto out; /* success */ | |
1facf9fc | 22922 | + |
f2c43d5f AM |
22923 | + d = a->src_dentry; /* already renamed on the branch */ |
22924 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) | |
22925 | + && a->btgt != au_dbdiropq(a->dst_dentry) | |
22926 | + && (a->btgt < au_dbdiropq(d) | |
22927 | + || a->btgt < au_dbbot(d) | |
22928 | + || always)) { | |
22929 | + AuDbgDentry(a->src_dentry); | |
22930 | + AuDbgDentry(a->dst_dentry); | |
22931 | + err = au_ren_do_diropq(a, AuDST); | |
4a4d8108 | 22932 | + if (unlikely(err)) |
f2c43d5f AM |
22933 | + goto out_rev_src; |
22934 | + au_fset_ren(a->auren_flags, DIROPQ_DST); | |
22935 | + } | |
22936 | + goto out; /* success */ | |
dece6358 | 22937 | + |
f2c43d5f AM |
22938 | +out_rev_src: |
22939 | + AuDbg("err %d, reverting src\n", err); | |
22940 | + au_ren_rev_diropq(err, a); | |
22941 | +out: | |
22942 | + return err; | |
22943 | +} | |
22944 | + | |
22945 | +static int do_rename(struct au_ren_args *a) | |
22946 | +{ | |
22947 | + int err; | |
22948 | + struct dentry *d, *h_d; | |
22949 | + | |
22950 | + if (!a->exchange) { | |
22951 | + /* prepare workqueue args for asynchronous rmdir */ | |
22952 | + h_d = a->dst_h_dentry; | |
22953 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) | |
8b6a4947 | 22954 | + /* && !au_ftest_ren(a->auren_flags, DIRREN) */ |
f2c43d5f AM |
22955 | + && d_is_positive(h_d)) { |
22956 | + err = -ENOMEM; | |
22957 | + a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, | |
22958 | + GFP_NOFS); | |
22959 | + if (unlikely(!a->thargs)) | |
22960 | + goto out; | |
22961 | + a->h_dst = dget(h_d); | |
22962 | + } | |
22963 | + | |
22964 | + /* create whiteout for src_dentry */ | |
22965 | + if (au_ftest_ren(a->auren_flags, WHSRC)) { | |
22966 | + a->src_bwh = au_dbwh(a->src_dentry); | |
22967 | + AuDebugOn(a->src_bwh >= 0); | |
22968 | + a->src_wh_dentry = au_wh_create(a->src_dentry, a->btgt, | |
22969 | + a->src_h_parent); | |
22970 | + err = PTR_ERR(a->src_wh_dentry); | |
22971 | + if (IS_ERR(a->src_wh_dentry)) | |
22972 | + goto out_thargs; | |
22973 | + } | |
22974 | + | |
22975 | + /* lookup whiteout for dentry */ | |
22976 | + if (au_ftest_ren(a->auren_flags, WHDST)) { | |
22977 | + h_d = au_wh_lkup(a->dst_h_parent, | |
22978 | + &a->dst_dentry->d_name, a->br); | |
22979 | + err = PTR_ERR(h_d); | |
22980 | + if (IS_ERR(h_d)) | |
22981 | + goto out_whsrc; | |
22982 | + if (d_is_negative(h_d)) | |
22983 | + dput(h_d); | |
22984 | + else | |
22985 | + a->dst_wh_dentry = h_d; | |
22986 | + } | |
22987 | + | |
22988 | + /* rename dentry to tmpwh */ | |
22989 | + if (a->thargs) { | |
22990 | + err = au_whtmp_ren(a->dst_h_dentry, a->br); | |
22991 | + if (unlikely(err)) | |
22992 | + goto out_whdst; | |
22993 | + | |
22994 | + d = a->dst_dentry; | |
22995 | + au_set_h_dptr(d, a->btgt, NULL); | |
22996 | + err = au_lkup_neg(d, a->btgt, /*wh*/0); | |
22997 | + if (unlikely(err)) | |
22998 | + goto out_whtmp; | |
22999 | + a->dst_h_dentry = au_h_dptr(d, a->btgt); | |
23000 | + } | |
4a4d8108 | 23001 | + } |
1facf9fc | 23002 | + |
5afbbe0d | 23003 | + BUG_ON(d_is_positive(a->dst_h_dentry) && a->src_btop != a->btgt); |
8b6a4947 AM |
23004 | +#if 0 |
23005 | + BUG_ON(!au_ftest_ren(a->auren_flags, DIRREN) | |
23006 | + && d_is_positive(a->dst_h_dentry) | |
23007 | + && a->src_btop != a->btgt); | |
23008 | +#endif | |
1facf9fc | 23009 | + |
4a4d8108 | 23010 | + /* rename by vfs_rename or cpup */ |
4a4d8108 AM |
23011 | + err = au_ren_or_cpup(a); |
23012 | + if (unlikely(err)) | |
23013 | + /* leave the copied-up one */ | |
23014 | + goto out_whtmp; | |
1308ab2a | 23015 | + |
4a4d8108 | 23016 | + /* make dir opaque */ |
f2c43d5f AM |
23017 | + err = au_ren_diropq(a); |
23018 | + if (unlikely(err)) | |
23019 | + goto out_rename; | |
1308ab2a | 23020 | + |
4a4d8108 | 23021 | + /* update target timestamps */ |
f2c43d5f AM |
23022 | + if (a->exchange) { |
23023 | + AuDebugOn(au_dbtop(a->dst_dentry) != a->btgt); | |
23024 | + a->h_path.dentry = au_h_dptr(a->dst_dentry, a->btgt); | |
23025 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
23026 | + a->dst_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; | |
23027 | + } | |
5afbbe0d | 23028 | + AuDebugOn(au_dbtop(a->src_dentry) != a->btgt); |
4a4d8108 AM |
23029 | + a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt); |
23030 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
5527c038 | 23031 | + a->src_inode->i_ctime = d_inode(a->h_path.dentry)->i_ctime; |
1facf9fc | 23032 | + |
f2c43d5f AM |
23033 | + if (!a->exchange) { |
23034 | + /* remove whiteout for dentry */ | |
23035 | + if (a->dst_wh_dentry) { | |
23036 | + a->h_path.dentry = a->dst_wh_dentry; | |
23037 | + err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path, | |
23038 | + a->dst_dentry); | |
23039 | + if (unlikely(err)) | |
23040 | + goto out_diropq; | |
23041 | + } | |
1facf9fc | 23042 | + |
f2c43d5f AM |
23043 | + /* remove whtmp */ |
23044 | + if (a->thargs) | |
23045 | + au_ren_del_whtmp(a); /* ignore this error */ | |
1308ab2a | 23046 | + |
f2c43d5f AM |
23047 | + au_fhsm_wrote(a->src_dentry->d_sb, a->btgt, /*force*/0); |
23048 | + } | |
4a4d8108 AM |
23049 | + err = 0; |
23050 | + goto out_success; | |
23051 | + | |
4f0767ce | 23052 | +out_diropq: |
f2c43d5f | 23053 | + au_ren_rev_diropq(err, a); |
4f0767ce | 23054 | +out_rename: |
7e9cd9fe | 23055 | + au_ren_rev_rename(err, a); |
027c5e7a | 23056 | + dput(a->h_dst); |
4f0767ce | 23057 | +out_whtmp: |
4a4d8108 AM |
23058 | + if (a->thargs) |
23059 | + au_ren_rev_whtmp(err, a); | |
4f0767ce | 23060 | +out_whdst: |
4a4d8108 AM |
23061 | + dput(a->dst_wh_dentry); |
23062 | + a->dst_wh_dentry = NULL; | |
4f0767ce | 23063 | +out_whsrc: |
4a4d8108 AM |
23064 | + if (a->src_wh_dentry) |
23065 | + au_ren_rev_whsrc(err, a); | |
4f0767ce | 23066 | +out_success: |
4a4d8108 AM |
23067 | + dput(a->src_wh_dentry); |
23068 | + dput(a->dst_wh_dentry); | |
4f0767ce | 23069 | +out_thargs: |
4a4d8108 AM |
23070 | + if (a->thargs) { |
23071 | + dput(a->h_dst); | |
23072 | + au_whtmp_rmdir_free(a->thargs); | |
23073 | + a->thargs = NULL; | |
23074 | + } | |
4f0767ce | 23075 | +out: |
4a4d8108 | 23076 | + return err; |
dece6358 | 23077 | +} |
1facf9fc | 23078 | + |
1308ab2a | 23079 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23080 | + |
4a4d8108 AM |
23081 | +/* |
23082 | + * test if @dentry dir can be rename destination or not. | |
23083 | + * success means, it is a logically empty dir. | |
23084 | + */ | |
23085 | +static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist) | |
1308ab2a | 23086 | +{ |
4a4d8108 | 23087 | + return au_test_empty(dentry, whlist); |
1308ab2a | 23088 | +} |
1facf9fc | 23089 | + |
4a4d8108 | 23090 | +/* |
8b6a4947 AM |
23091 | + * test if @a->src_dentry dir can be rename source or not. |
23092 | + * if it can, return 0. | |
4a4d8108 AM |
23093 | + * success means, |
23094 | + * - it is a logically empty dir. | |
23095 | + * - or, it exists on writable branch and has no children including whiteouts | |
8b6a4947 | 23096 | + * on the lower branch unless DIRREN is on. |
4a4d8108 | 23097 | + */ |
8b6a4947 | 23098 | +static int may_rename_srcdir(struct au_ren_args *a) |
4a4d8108 AM |
23099 | +{ |
23100 | + int err; | |
23101 | + unsigned int rdhash; | |
8b6a4947 AM |
23102 | + aufs_bindex_t btop, btgt; |
23103 | + struct dentry *dentry; | |
23104 | + struct super_block *sb; | |
23105 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 23106 | + |
8b6a4947 AM |
23107 | + dentry = a->src_dentry; |
23108 | + sb = dentry->d_sb; | |
23109 | + sbinfo = au_sbi(sb); | |
23110 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) | |
23111 | + au_fset_ren(a->auren_flags, DIRREN); | |
23112 | + | |
23113 | + btgt = a->btgt; | |
5afbbe0d AM |
23114 | + btop = au_dbtop(dentry); |
23115 | + if (btop != btgt) { | |
4a4d8108 | 23116 | + struct au_nhash whlist; |
dece6358 | 23117 | + |
8b6a4947 AM |
23118 | + SiMustAnyLock(sb); |
23119 | + rdhash = sbinfo->si_rdhash; | |
4a4d8108 AM |
23120 | + if (!rdhash) |
23121 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, | |
23122 | + dentry)); | |
23123 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
23124 | + if (unlikely(err)) | |
23125 | + goto out; | |
23126 | + err = au_test_empty(dentry, &whlist); | |
23127 | + au_nhash_wh_free(&whlist); | |
23128 | + goto out; | |
23129 | + } | |
dece6358 | 23130 | + |
5afbbe0d | 23131 | + if (btop == au_dbtaildir(dentry)) |
4a4d8108 | 23132 | + return 0; /* success */ |
dece6358 | 23133 | + |
4a4d8108 | 23134 | + err = au_test_empty_lower(dentry); |
1facf9fc | 23135 | + |
4f0767ce | 23136 | +out: |
4a4d8108 | 23137 | + if (err == -ENOTEMPTY) { |
8b6a4947 AM |
23138 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { |
23139 | + err = 0; | |
23140 | + } else { | |
23141 | + AuWarn1("renaming dir who has child(ren) on multiple " | |
23142 | + "branches, is not supported\n"); | |
23143 | + err = -EXDEV; | |
23144 | + } | |
4a4d8108 AM |
23145 | + } |
23146 | + return err; | |
23147 | +} | |
1308ab2a | 23148 | + |
4a4d8108 AM |
23149 | +/* side effect: sets whlist and h_dentry */ |
23150 | +static int au_ren_may_dir(struct au_ren_args *a) | |
1308ab2a | 23151 | +{ |
4a4d8108 AM |
23152 | + int err; |
23153 | + unsigned int rdhash; | |
23154 | + struct dentry *d; | |
1facf9fc | 23155 | + |
4a4d8108 AM |
23156 | + d = a->dst_dentry; |
23157 | + SiMustAnyLock(d->d_sb); | |
1facf9fc | 23158 | + |
4a4d8108 | 23159 | + err = 0; |
f2c43d5f | 23160 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST) && a->dst_inode) { |
4a4d8108 AM |
23161 | + rdhash = au_sbi(d->d_sb)->si_rdhash; |
23162 | + if (!rdhash) | |
23163 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d)); | |
23164 | + err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS); | |
23165 | + if (unlikely(err)) | |
23166 | + goto out; | |
1308ab2a | 23167 | + |
f2c43d5f AM |
23168 | + if (!a->exchange) { |
23169 | + au_set_dbtop(d, a->dst_btop); | |
23170 | + err = may_rename_dstdir(d, &a->whlist); | |
23171 | + au_set_dbtop(d, a->btgt); | |
23172 | + } else | |
8b6a4947 | 23173 | + err = may_rename_srcdir(a); |
4a4d8108 | 23174 | + } |
5afbbe0d | 23175 | + a->dst_h_dentry = au_h_dptr(d, au_dbtop(d)); |
4a4d8108 AM |
23176 | + if (unlikely(err)) |
23177 | + goto out; | |
23178 | + | |
23179 | + d = a->src_dentry; | |
5afbbe0d | 23180 | + a->src_h_dentry = au_h_dptr(d, au_dbtop(d)); |
f2c43d5f | 23181 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { |
8b6a4947 | 23182 | + err = may_rename_srcdir(a); |
4a4d8108 AM |
23183 | + if (unlikely(err)) { |
23184 | + au_nhash_wh_free(&a->whlist); | |
23185 | + a->whlist.nh_num = 0; | |
23186 | + } | |
23187 | + } | |
4f0767ce | 23188 | +out: |
4a4d8108 | 23189 | + return err; |
1facf9fc | 23190 | +} |
23191 | + | |
4a4d8108 | 23192 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23193 | + |
4a4d8108 AM |
23194 | +/* |
23195 | + * simple tests for rename. | |
23196 | + * following the checks in vfs, plus the parent-child relationship. | |
23197 | + */ | |
23198 | +static int au_may_ren(struct au_ren_args *a) | |
23199 | +{ | |
23200 | + int err, isdir; | |
23201 | + struct inode *h_inode; | |
1facf9fc | 23202 | + |
5afbbe0d | 23203 | + if (a->src_btop == a->btgt) { |
4a4d8108 | 23204 | + err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent, |
f2c43d5f | 23205 | + au_ftest_ren(a->auren_flags, ISDIR_SRC)); |
4a4d8108 AM |
23206 | + if (unlikely(err)) |
23207 | + goto out; | |
23208 | + err = -EINVAL; | |
23209 | + if (unlikely(a->src_h_dentry == a->h_trap)) | |
23210 | + goto out; | |
23211 | + } | |
1facf9fc | 23212 | + |
4a4d8108 | 23213 | + err = 0; |
5afbbe0d | 23214 | + if (a->dst_btop != a->btgt) |
4a4d8108 | 23215 | + goto out; |
1facf9fc | 23216 | + |
027c5e7a AM |
23217 | + err = -ENOTEMPTY; |
23218 | + if (unlikely(a->dst_h_dentry == a->h_trap)) | |
23219 | + goto out; | |
23220 | + | |
4a4d8108 | 23221 | + err = -EIO; |
f2c43d5f | 23222 | + isdir = !!au_ftest_ren(a->auren_flags, ISDIR_DST); |
5527c038 JR |
23223 | + if (d_really_is_negative(a->dst_dentry)) { |
23224 | + if (d_is_negative(a->dst_h_dentry)) | |
23225 | + err = au_may_add(a->dst_dentry, a->btgt, | |
23226 | + a->dst_h_parent, isdir); | |
4a4d8108 | 23227 | + } else { |
5527c038 | 23228 | + if (unlikely(d_is_negative(a->dst_h_dentry))) |
4a4d8108 | 23229 | + goto out; |
5527c038 JR |
23230 | + h_inode = d_inode(a->dst_h_dentry); |
23231 | + if (h_inode->i_nlink) | |
23232 | + err = au_may_del(a->dst_dentry, a->btgt, | |
23233 | + a->dst_h_parent, isdir); | |
4a4d8108 | 23234 | + } |
1facf9fc | 23235 | + |
4f0767ce | 23236 | +out: |
4a4d8108 AM |
23237 | + if (unlikely(err == -ENOENT || err == -EEXIST)) |
23238 | + err = -EIO; | |
23239 | + AuTraceErr(err); | |
23240 | + return err; | |
23241 | +} | |
1facf9fc | 23242 | + |
1308ab2a | 23243 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 23244 | + |
4a4d8108 AM |
23245 | +/* |
23246 | + * locking order | |
23247 | + * (VFS) | |
23248 | + * - src_dir and dir by lock_rename() | |
23249 | + * - inode if exitsts | |
23250 | + * (aufs) | |
23251 | + * - lock all | |
23252 | + * + src_dentry and dentry by aufs_read_and_write_lock2() which calls, | |
23253 | + * + si_read_lock | |
23254 | + * + di_write_lock2_child() | |
23255 | + * + di_write_lock_child() | |
23256 | + * + ii_write_lock_child() | |
23257 | + * + di_write_lock_child2() | |
23258 | + * + ii_write_lock_child2() | |
23259 | + * + src_parent and parent | |
23260 | + * + di_write_lock_parent() | |
23261 | + * + ii_write_lock_parent() | |
23262 | + * + di_write_lock_parent2() | |
23263 | + * + ii_write_lock_parent2() | |
23264 | + * + lower src_dir and dir by vfsub_lock_rename() | |
23265 | + * + verify the every relationships between child and parent. if any | |
23266 | + * of them failed, unlock all and return -EBUSY. | |
23267 | + */ | |
23268 | +static void au_ren_unlock(struct au_ren_args *a) | |
1308ab2a | 23269 | +{ |
4a4d8108 AM |
23270 | + vfsub_unlock_rename(a->src_h_parent, a->src_hdir, |
23271 | + a->dst_h_parent, a->dst_hdir); | |
8b6a4947 AM |
23272 | + if (au_ftest_ren(a->auren_flags, DIRREN) |
23273 | + && a->h_root) | |
23274 | + au_hn_inode_unlock(a->h_root); | |
f2c43d5f | 23275 | + if (au_ftest_ren(a->auren_flags, MNT_WRITE)) |
86dc4139 | 23276 | + vfsub_mnt_drop_write(au_br_mnt(a->br)); |
1308ab2a | 23277 | +} |
23278 | + | |
4a4d8108 | 23279 | +static int au_ren_lock(struct au_ren_args *a) |
1308ab2a | 23280 | +{ |
4a4d8108 AM |
23281 | + int err; |
23282 | + unsigned int udba; | |
1308ab2a | 23283 | + |
4a4d8108 AM |
23284 | + err = 0; |
23285 | + a->src_h_parent = au_h_dptr(a->src_parent, a->btgt); | |
23286 | + a->src_hdir = au_hi(a->src_dir, a->btgt); | |
23287 | + a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt); | |
23288 | + a->dst_hdir = au_hi(a->dst_dir, a->btgt); | |
86dc4139 AM |
23289 | + |
23290 | + err = vfsub_mnt_want_write(au_br_mnt(a->br)); | |
23291 | + if (unlikely(err)) | |
23292 | + goto out; | |
f2c43d5f | 23293 | + au_fset_ren(a->auren_flags, MNT_WRITE); |
8b6a4947 AM |
23294 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { |
23295 | + struct dentry *root; | |
23296 | + struct inode *dir; | |
23297 | + | |
23298 | + /* | |
23299 | + * sbinfo is already locked, so this ii_read_lock is | |
23300 | + * unnecessary. but our debugging feature checks it. | |
23301 | + */ | |
23302 | + root = a->src_inode->i_sb->s_root; | |
23303 | + if (root != a->src_parent && root != a->dst_parent) { | |
23304 | + dir = d_inode(root); | |
23305 | + ii_read_lock_parent3(dir); | |
23306 | + a->h_root = au_hi(dir, a->btgt); | |
23307 | + ii_read_unlock(dir); | |
23308 | + au_hn_inode_lock_nested(a->h_root, AuLsc_I_PARENT3); | |
23309 | + } | |
23310 | + } | |
4a4d8108 AM |
23311 | + a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir, |
23312 | + a->dst_h_parent, a->dst_hdir); | |
23313 | + udba = au_opt_udba(a->src_dentry->d_sb); | |
5527c038 JR |
23314 | + if (unlikely(a->src_hdir->hi_inode != d_inode(a->src_h_parent) |
23315 | + || a->dst_hdir->hi_inode != d_inode(a->dst_h_parent))) | |
4a4d8108 | 23316 | + err = au_busy_or_stale(); |
5afbbe0d | 23317 | + if (!err && au_dbtop(a->src_dentry) == a->btgt) |
4a4d8108 | 23318 | + err = au_h_verify(a->src_h_dentry, udba, |
5527c038 | 23319 | + d_inode(a->src_h_parent), a->src_h_parent, |
4a4d8108 | 23320 | + a->br); |
5afbbe0d | 23321 | + if (!err && au_dbtop(a->dst_dentry) == a->btgt) |
4a4d8108 | 23322 | + err = au_h_verify(a->dst_h_dentry, udba, |
5527c038 | 23323 | + d_inode(a->dst_h_parent), a->dst_h_parent, |
4a4d8108 | 23324 | + a->br); |
86dc4139 | 23325 | + if (!err) |
4a4d8108 | 23326 | + goto out; /* success */ |
4a4d8108 AM |
23327 | + |
23328 | + err = au_busy_or_stale(); | |
4a4d8108 | 23329 | + au_ren_unlock(a); |
86dc4139 | 23330 | + |
4f0767ce | 23331 | +out: |
4a4d8108 | 23332 | + return err; |
1facf9fc | 23333 | +} |
23334 | + | |
23335 | +/* ---------------------------------------------------------------------- */ | |
23336 | + | |
4a4d8108 | 23337 | +static void au_ren_refresh_dir(struct au_ren_args *a) |
1facf9fc | 23338 | +{ |
4a4d8108 | 23339 | + struct inode *dir; |
dece6358 | 23340 | + |
4a4d8108 | 23341 | + dir = a->dst_dir; |
be118d29 | 23342 | + inode_inc_iversion(dir); |
f2c43d5f | 23343 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) { |
4a4d8108 AM |
23344 | + /* is this updating defined in POSIX? */ |
23345 | + au_cpup_attr_timesizes(a->src_inode); | |
23346 | + au_cpup_attr_nlink(dir, /*force*/1); | |
4a4d8108 | 23347 | + } |
b912730e | 23348 | + au_dir_ts(dir, a->btgt); |
dece6358 | 23349 | + |
f2c43d5f AM |
23350 | + if (a->exchange) { |
23351 | + dir = a->src_dir; | |
be118d29 | 23352 | + inode_inc_iversion(dir); |
f2c43d5f AM |
23353 | + if (au_ftest_ren(a->auren_flags, ISDIR_DST)) { |
23354 | + /* is this updating defined in POSIX? */ | |
23355 | + au_cpup_attr_timesizes(a->dst_inode); | |
23356 | + au_cpup_attr_nlink(dir, /*force*/1); | |
23357 | + } | |
23358 | + au_dir_ts(dir, a->btgt); | |
23359 | + } | |
23360 | + | |
23361 | + if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) | |
4a4d8108 | 23362 | + return; |
dece6358 | 23363 | + |
4a4d8108 | 23364 | + dir = a->src_dir; |
be118d29 | 23365 | + inode_inc_iversion(dir); |
f2c43d5f | 23366 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC)) |
4a4d8108 | 23367 | + au_cpup_attr_nlink(dir, /*force*/1); |
b912730e | 23368 | + au_dir_ts(dir, a->btgt); |
1facf9fc | 23369 | +} |
23370 | + | |
4a4d8108 | 23371 | +static void au_ren_refresh(struct au_ren_args *a) |
1facf9fc | 23372 | +{ |
5afbbe0d | 23373 | + aufs_bindex_t bbot, bindex; |
4a4d8108 AM |
23374 | + struct dentry *d, *h_d; |
23375 | + struct inode *i, *h_i; | |
23376 | + struct super_block *sb; | |
dece6358 | 23377 | + |
027c5e7a AM |
23378 | + d = a->dst_dentry; |
23379 | + d_drop(d); | |
23380 | + if (a->h_dst) | |
23381 | + /* already dget-ed by au_ren_or_cpup() */ | |
23382 | + au_set_h_dptr(d, a->btgt, a->h_dst); | |
23383 | + | |
23384 | + i = a->dst_inode; | |
23385 | + if (i) { | |
f2c43d5f AM |
23386 | + if (!a->exchange) { |
23387 | + if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) | |
23388 | + vfsub_drop_nlink(i); | |
23389 | + else { | |
23390 | + vfsub_dead_dir(i); | |
23391 | + au_cpup_attr_timesizes(i); | |
23392 | + } | |
23393 | + au_update_dbrange(d, /*do_put_zero*/1); | |
23394 | + } else | |
23395 | + au_cpup_attr_nlink(i, /*force*/1); | |
027c5e7a | 23396 | + } else { |
5afbbe0d AM |
23397 | + bbot = a->btgt; |
23398 | + for (bindex = au_dbtop(d); bindex < bbot; bindex++) | |
027c5e7a | 23399 | + au_set_h_dptr(d, bindex, NULL); |
5afbbe0d AM |
23400 | + bbot = au_dbbot(d); |
23401 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) | |
027c5e7a AM |
23402 | + au_set_h_dptr(d, bindex, NULL); |
23403 | + au_update_dbrange(d, /*do_put_zero*/0); | |
23404 | + } | |
23405 | + | |
8b6a4947 AM |
23406 | + if (a->exchange |
23407 | + || au_ftest_ren(a->auren_flags, DIRREN)) { | |
23408 | + d_drop(a->src_dentry); | |
23409 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23410 | + au_set_dbwh(a->src_dentry, -1); | |
23411 | + return; | |
23412 | + } | |
23413 | + | |
4a4d8108 | 23414 | + d = a->src_dentry; |
8b6a4947 AM |
23415 | + au_set_dbwh(d, -1); |
23416 | + bbot = au_dbbot(d); | |
23417 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { | |
23418 | + h_d = au_h_dptr(d, bindex); | |
23419 | + if (h_d) | |
23420 | + au_set_h_dptr(d, bindex, NULL); | |
23421 | + } | |
23422 | + au_set_dbbot(d, a->btgt); | |
4a4d8108 | 23423 | + |
8b6a4947 AM |
23424 | + sb = d->d_sb; |
23425 | + i = a->src_inode; | |
23426 | + if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i)) | |
23427 | + return; /* success */ | |
4a4d8108 | 23428 | + |
8b6a4947 AM |
23429 | + bbot = au_ibbot(i); |
23430 | + for (bindex = a->btgt + 1; bindex <= bbot; bindex++) { | |
23431 | + h_i = au_h_iptr(i, bindex); | |
23432 | + if (h_i) { | |
23433 | + au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0); | |
23434 | + /* ignore this error */ | |
23435 | + au_set_h_iptr(i, bindex, NULL, 0); | |
4a4d8108 AM |
23436 | + } |
23437 | + } | |
8b6a4947 | 23438 | + au_set_ibbot(i, a->btgt); |
1308ab2a | 23439 | +} |
dece6358 | 23440 | + |
4a4d8108 AM |
23441 | +/* ---------------------------------------------------------------------- */ |
23442 | + | |
23443 | +/* mainly for link(2) and rename(2) */ | |
23444 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt) | |
1308ab2a | 23445 | +{ |
4a4d8108 AM |
23446 | + aufs_bindex_t bdiropq, bwh; |
23447 | + struct dentry *parent; | |
23448 | + struct au_branch *br; | |
23449 | + | |
23450 | + parent = dentry->d_parent; | |
5527c038 | 23451 | + IMustLock(d_inode(parent)); /* dir is locked */ |
4a4d8108 AM |
23452 | + |
23453 | + bdiropq = au_dbdiropq(parent); | |
23454 | + bwh = au_dbwh(dentry); | |
23455 | + br = au_sbr(dentry->d_sb, btgt); | |
23456 | + if (au_br_rdonly(br) | |
23457 | + || (0 <= bdiropq && bdiropq < btgt) | |
23458 | + || (0 <= bwh && bwh < btgt)) | |
23459 | + btgt = -1; | |
23460 | + | |
23461 | + AuDbg("btgt %d\n", btgt); | |
23462 | + return btgt; | |
1facf9fc | 23463 | +} |
23464 | + | |
5afbbe0d | 23465 | +/* sets src_btop, dst_btop and btgt */ |
4a4d8108 | 23466 | +static int au_ren_wbr(struct au_ren_args *a) |
1facf9fc | 23467 | +{ |
4a4d8108 AM |
23468 | + int err; |
23469 | + struct au_wr_dir_args wr_dir_args = { | |
23470 | + /* .force_btgt = -1, */ | |
23471 | + .flags = AuWrDir_ADD_ENTRY | |
23472 | + }; | |
dece6358 | 23473 | + |
5afbbe0d AM |
23474 | + a->src_btop = au_dbtop(a->src_dentry); |
23475 | + a->dst_btop = au_dbtop(a->dst_dentry); | |
f2c43d5f AM |
23476 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) |
23477 | + || au_ftest_ren(a->auren_flags, ISDIR_DST)) | |
4a4d8108 | 23478 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); |
5afbbe0d AM |
23479 | + wr_dir_args.force_btgt = a->src_btop; |
23480 | + if (a->dst_inode && a->dst_btop < a->src_btop) | |
23481 | + wr_dir_args.force_btgt = a->dst_btop; | |
4a4d8108 AM |
23482 | + wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt); |
23483 | + err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args); | |
23484 | + a->btgt = err; | |
f2c43d5f AM |
23485 | + if (a->exchange) |
23486 | + au_update_dbtop(a->dst_dentry); | |
dece6358 | 23487 | + |
4a4d8108 | 23488 | + return err; |
1facf9fc | 23489 | +} |
23490 | + | |
4a4d8108 | 23491 | +static void au_ren_dt(struct au_ren_args *a) |
1facf9fc | 23492 | +{ |
4a4d8108 AM |
23493 | + a->h_path.dentry = a->src_h_parent; |
23494 | + au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path); | |
f2c43d5f | 23495 | + if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) { |
4a4d8108 AM |
23496 | + a->h_path.dentry = a->dst_h_parent; |
23497 | + au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path); | |
23498 | + } | |
1facf9fc | 23499 | + |
f2c43d5f AM |
23500 | + au_fclr_ren(a->auren_flags, DT_DSTDIR); |
23501 | + if (!au_ftest_ren(a->auren_flags, ISDIR_SRC) | |
23502 | + && !a->exchange) | |
4a4d8108 | 23503 | + return; |
dece6358 | 23504 | + |
4a4d8108 AM |
23505 | + a->h_path.dentry = a->src_h_dentry; |
23506 | + au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path); | |
5527c038 | 23507 | + if (d_is_positive(a->dst_h_dentry)) { |
f2c43d5f | 23508 | + au_fset_ren(a->auren_flags, DT_DSTDIR); |
4a4d8108 AM |
23509 | + a->h_path.dentry = a->dst_h_dentry; |
23510 | + au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path); | |
23511 | + } | |
1308ab2a | 23512 | +} |
dece6358 | 23513 | + |
4a4d8108 | 23514 | +static void au_ren_rev_dt(int err, struct au_ren_args *a) |
1308ab2a | 23515 | +{ |
4a4d8108 | 23516 | + struct dentry *h_d; |
febd17d6 | 23517 | + struct inode *h_inode; |
4a4d8108 AM |
23518 | + |
23519 | + au_dtime_revert(a->src_dt + AuPARENT); | |
f2c43d5f | 23520 | + if (!au_ftest_ren(a->auren_flags, ISSAMEDIR)) |
4a4d8108 AM |
23521 | + au_dtime_revert(a->dst_dt + AuPARENT); |
23522 | + | |
f2c43d5f | 23523 | + if (au_ftest_ren(a->auren_flags, ISDIR_SRC) && err != -EIO) { |
4a4d8108 | 23524 | + h_d = a->src_dt[AuCHILD].dt_h_path.dentry; |
febd17d6 JR |
23525 | + h_inode = d_inode(h_d); |
23526 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); | |
4a4d8108 | 23527 | + au_dtime_revert(a->src_dt + AuCHILD); |
febd17d6 | 23528 | + inode_unlock(h_inode); |
4a4d8108 | 23529 | + |
f2c43d5f | 23530 | + if (au_ftest_ren(a->auren_flags, DT_DSTDIR)) { |
4a4d8108 | 23531 | + h_d = a->dst_dt[AuCHILD].dt_h_path.dentry; |
febd17d6 JR |
23532 | + h_inode = d_inode(h_d); |
23533 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); | |
4a4d8108 | 23534 | + au_dtime_revert(a->dst_dt + AuCHILD); |
febd17d6 | 23535 | + inode_unlock(h_inode); |
1facf9fc | 23536 | + } |
23537 | + } | |
23538 | +} | |
23539 | + | |
4a4d8108 AM |
23540 | +/* ---------------------------------------------------------------------- */ |
23541 | + | |
23542 | +int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry, | |
f2c43d5f AM |
23543 | + struct inode *_dst_dir, struct dentry *_dst_dentry, |
23544 | + unsigned int _flags) | |
1facf9fc | 23545 | +{ |
f2c43d5f | 23546 | + int err, lock_flags; |
8b6a4947 | 23547 | + void *rev; |
4a4d8108 AM |
23548 | + /* reduce stack space */ |
23549 | + struct au_ren_args *a; | |
f2c43d5f | 23550 | + struct au_pin pin; |
4a4d8108 | 23551 | + |
f2c43d5f | 23552 | + AuDbg("%pd, %pd, 0x%x\n", _src_dentry, _dst_dentry, _flags); |
4a4d8108 AM |
23553 | + IMustLock(_src_dir); |
23554 | + IMustLock(_dst_dir); | |
23555 | + | |
f2c43d5f AM |
23556 | + err = -EINVAL; |
23557 | + if (unlikely(_flags & RENAME_WHITEOUT)) | |
23558 | + goto out; | |
23559 | + | |
4a4d8108 AM |
23560 | + err = -ENOMEM; |
23561 | + BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE); | |
23562 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
23563 | + if (unlikely(!a)) | |
23564 | + goto out; | |
23565 | + | |
f2c43d5f AM |
23566 | + a->flags = _flags; |
23567 | + a->exchange = _flags & RENAME_EXCHANGE; | |
4a4d8108 AM |
23568 | + a->src_dir = _src_dir; |
23569 | + a->src_dentry = _src_dentry; | |
5527c038 JR |
23570 | + a->src_inode = NULL; |
23571 | + if (d_really_is_positive(a->src_dentry)) | |
23572 | + a->src_inode = d_inode(a->src_dentry); | |
4a4d8108 AM |
23573 | + a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */ |
23574 | + a->dst_dir = _dst_dir; | |
23575 | + a->dst_dentry = _dst_dentry; | |
5527c038 JR |
23576 | + a->dst_inode = NULL; |
23577 | + if (d_really_is_positive(a->dst_dentry)) | |
23578 | + a->dst_inode = d_inode(a->dst_dentry); | |
4a4d8108 AM |
23579 | + a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */ |
23580 | + if (a->dst_inode) { | |
f2c43d5f AM |
23581 | + /* |
23582 | + * if EXCHANGE && src is non-dir && dst is dir, | |
23583 | + * dst is not locked. | |
23584 | + */ | |
23585 | + /* IMustLock(a->dst_inode); */ | |
4a4d8108 | 23586 | + au_igrab(a->dst_inode); |
1facf9fc | 23587 | + } |
1facf9fc | 23588 | + |
4a4d8108 | 23589 | + err = -ENOTDIR; |
f2c43d5f | 23590 | + lock_flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN; |
2000de60 | 23591 | + if (d_is_dir(a->src_dentry)) { |
f2c43d5f AM |
23592 | + au_fset_ren(a->auren_flags, ISDIR_SRC); |
23593 | + if (unlikely(!a->exchange | |
23594 | + && d_really_is_positive(a->dst_dentry) | |
2000de60 | 23595 | + && !d_is_dir(a->dst_dentry))) |
4a4d8108 | 23596 | + goto out_free; |
f2c43d5f AM |
23597 | + lock_flags |= AuLock_DIRS; |
23598 | + } | |
23599 | + if (a->dst_inode && d_is_dir(a->dst_dentry)) { | |
23600 | + au_fset_ren(a->auren_flags, ISDIR_DST); | |
23601 | + if (unlikely(!a->exchange | |
23602 | + && d_really_is_positive(a->src_dentry) | |
23603 | + && !d_is_dir(a->src_dentry))) | |
23604 | + goto out_free; | |
23605 | + lock_flags |= AuLock_DIRS; | |
b95c5147 | 23606 | + } |
8b6a4947 AM |
23607 | + err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
23608 | + lock_flags); | |
e49829fe JR |
23609 | + if (unlikely(err)) |
23610 | + goto out_free; | |
1facf9fc | 23611 | + |
027c5e7a AM |
23612 | + err = au_d_hashed_positive(a->src_dentry); |
23613 | + if (unlikely(err)) | |
23614 | + goto out_unlock; | |
23615 | + err = -ENOENT; | |
23616 | + if (a->dst_inode) { | |
23617 | + /* | |
f2c43d5f | 23618 | + * If it is a dir, VFS unhash it before this |
027c5e7a AM |
23619 | + * function. It means we cannot rely upon d_unhashed(). |
23620 | + */ | |
23621 | + if (unlikely(!a->dst_inode->i_nlink)) | |
23622 | + goto out_unlock; | |
f2c43d5f | 23623 | + if (!au_ftest_ren(a->auren_flags, ISDIR_DST)) { |
027c5e7a | 23624 | + err = au_d_hashed_positive(a->dst_dentry); |
f2c43d5f | 23625 | + if (unlikely(err && !a->exchange)) |
027c5e7a AM |
23626 | + goto out_unlock; |
23627 | + } else if (unlikely(IS_DEADDIR(a->dst_inode))) | |
23628 | + goto out_unlock; | |
23629 | + } else if (unlikely(d_unhashed(a->dst_dentry))) | |
23630 | + goto out_unlock; | |
23631 | + | |
7eafdf33 AM |
23632 | + /* |
23633 | + * is it possible? | |
79b8bda9 | 23634 | + * yes, it happened (in linux-3.3-rcN) but I don't know why. |
7eafdf33 AM |
23635 | + * there may exist a problem somewhere else. |
23636 | + */ | |
23637 | + err = -EINVAL; | |
5527c038 | 23638 | + if (unlikely(d_inode(a->dst_parent) == d_inode(a->src_dentry))) |
7eafdf33 AM |
23639 | + goto out_unlock; |
23640 | + | |
f2c43d5f | 23641 | + au_fset_ren(a->auren_flags, ISSAMEDIR); /* temporary */ |
4a4d8108 | 23642 | + di_write_lock_parent(a->dst_parent); |
1facf9fc | 23643 | + |
4a4d8108 AM |
23644 | + /* which branch we process */ |
23645 | + err = au_ren_wbr(a); | |
23646 | + if (unlikely(err < 0)) | |
027c5e7a | 23647 | + goto out_parent; |
4a4d8108 | 23648 | + a->br = au_sbr(a->dst_dentry->d_sb, a->btgt); |
86dc4139 | 23649 | + a->h_path.mnt = au_br_mnt(a->br); |
1facf9fc | 23650 | + |
4a4d8108 AM |
23651 | + /* are they available to be renamed */ |
23652 | + err = au_ren_may_dir(a); | |
23653 | + if (unlikely(err)) | |
23654 | + goto out_children; | |
1facf9fc | 23655 | + |
4a4d8108 | 23656 | + /* prepare the writable parent dir on the same branch */ |
5afbbe0d | 23657 | + if (a->dst_btop == a->btgt) { |
f2c43d5f | 23658 | + au_fset_ren(a->auren_flags, WHDST); |
4a4d8108 AM |
23659 | + } else { |
23660 | + err = au_cpup_dirs(a->dst_dentry, a->btgt); | |
23661 | + if (unlikely(err)) | |
23662 | + goto out_children; | |
23663 | + } | |
1facf9fc | 23664 | + |
f2c43d5f AM |
23665 | + err = 0; |
23666 | + if (!a->exchange) { | |
23667 | + if (a->src_dir != a->dst_dir) { | |
23668 | + /* | |
23669 | + * this temporary unlock is safe, | |
23670 | + * because both dir->i_mutex are locked. | |
23671 | + */ | |
23672 | + di_write_unlock(a->dst_parent); | |
23673 | + di_write_lock_parent(a->src_parent); | |
23674 | + err = au_wr_dir_need_wh(a->src_dentry, | |
23675 | + au_ftest_ren(a->auren_flags, | |
23676 | + ISDIR_SRC), | |
23677 | + &a->btgt); | |
23678 | + di_write_unlock(a->src_parent); | |
23679 | + di_write_lock2_parent(a->src_parent, a->dst_parent, | |
23680 | + /*isdir*/1); | |
23681 | + au_fclr_ren(a->auren_flags, ISSAMEDIR); | |
23682 | + } else | |
23683 | + err = au_wr_dir_need_wh(a->src_dentry, | |
23684 | + au_ftest_ren(a->auren_flags, | |
23685 | + ISDIR_SRC), | |
23686 | + &a->btgt); | |
23687 | + } | |
4a4d8108 AM |
23688 | + if (unlikely(err < 0)) |
23689 | + goto out_children; | |
23690 | + if (err) | |
f2c43d5f | 23691 | + au_fset_ren(a->auren_flags, WHSRC); |
1facf9fc | 23692 | + |
86dc4139 | 23693 | + /* cpup src */ |
5afbbe0d | 23694 | + if (a->src_btop != a->btgt) { |
86dc4139 AM |
23695 | + err = au_pin(&pin, a->src_dentry, a->btgt, |
23696 | + au_opt_udba(a->src_dentry->d_sb), | |
23697 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
367653fa | 23698 | + if (!err) { |
c2b27bf2 AM |
23699 | + struct au_cp_generic cpg = { |
23700 | + .dentry = a->src_dentry, | |
23701 | + .bdst = a->btgt, | |
5afbbe0d | 23702 | + .bsrc = a->src_btop, |
c2b27bf2 AM |
23703 | + .len = -1, |
23704 | + .pin = &pin, | |
23705 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
23706 | + }; | |
5afbbe0d | 23707 | + AuDebugOn(au_dbtop(a->src_dentry) != a->src_btop); |
c2b27bf2 | 23708 | + err = au_sio_cpup_simple(&cpg); |
367653fa | 23709 | + au_unpin(&pin); |
86dc4139 | 23710 | + } |
86dc4139 AM |
23711 | + if (unlikely(err)) |
23712 | + goto out_children; | |
5afbbe0d | 23713 | + a->src_btop = a->btgt; |
86dc4139 | 23714 | + a->src_h_dentry = au_h_dptr(a->src_dentry, a->btgt); |
f2c43d5f AM |
23715 | + if (!a->exchange) |
23716 | + au_fset_ren(a->auren_flags, WHSRC); | |
23717 | + } | |
23718 | + | |
23719 | + /* cpup dst */ | |
23720 | + if (a->exchange && a->dst_inode | |
23721 | + && a->dst_btop != a->btgt) { | |
23722 | + err = au_pin(&pin, a->dst_dentry, a->btgt, | |
23723 | + au_opt_udba(a->dst_dentry->d_sb), | |
23724 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
23725 | + if (!err) { | |
23726 | + struct au_cp_generic cpg = { | |
23727 | + .dentry = a->dst_dentry, | |
23728 | + .bdst = a->btgt, | |
23729 | + .bsrc = a->dst_btop, | |
23730 | + .len = -1, | |
23731 | + .pin = &pin, | |
23732 | + .flags = AuCpup_DTIME | AuCpup_HOPEN | |
23733 | + }; | |
23734 | + err = au_sio_cpup_simple(&cpg); | |
23735 | + au_unpin(&pin); | |
23736 | + } | |
23737 | + if (unlikely(err)) | |
23738 | + goto out_children; | |
23739 | + a->dst_btop = a->btgt; | |
23740 | + a->dst_h_dentry = au_h_dptr(a->dst_dentry, a->btgt); | |
86dc4139 AM |
23741 | + } |
23742 | + | |
4a4d8108 AM |
23743 | + /* lock them all */ |
23744 | + err = au_ren_lock(a); | |
23745 | + if (unlikely(err)) | |
86dc4139 | 23746 | + /* leave the copied-up one */ |
4a4d8108 | 23747 | + goto out_children; |
1facf9fc | 23748 | + |
f2c43d5f AM |
23749 | + if (!a->exchange) { |
23750 | + if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE)) | |
23751 | + err = au_may_ren(a); | |
23752 | + else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
23753 | + err = -ENAMETOOLONG; | |
23754 | + if (unlikely(err)) | |
23755 | + goto out_hdir; | |
23756 | + } | |
1facf9fc | 23757 | + |
4a4d8108 AM |
23758 | + /* store timestamps to be revertible */ |
23759 | + au_ren_dt(a); | |
1facf9fc | 23760 | + |
8b6a4947 AM |
23761 | + /* store dirren info */ |
23762 | + if (au_ftest_ren(a->auren_flags, DIRREN)) { | |
23763 | + err = au_dr_rename(a->src_dentry, a->btgt, | |
23764 | + &a->dst_dentry->d_name, &rev); | |
23765 | + AuTraceErr(err); | |
23766 | + if (unlikely(err)) | |
23767 | + goto out_dt; | |
23768 | + } | |
23769 | + | |
4a4d8108 AM |
23770 | + /* here we go */ |
23771 | + err = do_rename(a); | |
23772 | + if (unlikely(err)) | |
8b6a4947 AM |
23773 | + goto out_dirren; |
23774 | + | |
23775 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23776 | + au_dr_rename_fin(a->src_dentry, a->btgt, rev); | |
4a4d8108 AM |
23777 | + |
23778 | + /* update dir attributes */ | |
23779 | + au_ren_refresh_dir(a); | |
23780 | + | |
23781 | + /* dput/iput all lower dentries */ | |
23782 | + au_ren_refresh(a); | |
23783 | + | |
23784 | + goto out_hdir; /* success */ | |
23785 | + | |
8b6a4947 AM |
23786 | +out_dirren: |
23787 | + if (au_ftest_ren(a->auren_flags, DIRREN)) | |
23788 | + au_dr_rename_rev(a->src_dentry, a->btgt, rev); | |
4f0767ce | 23789 | +out_dt: |
4a4d8108 | 23790 | + au_ren_rev_dt(err, a); |
4f0767ce | 23791 | +out_hdir: |
4a4d8108 | 23792 | + au_ren_unlock(a); |
4f0767ce | 23793 | +out_children: |
4a4d8108 | 23794 | + au_nhash_wh_free(&a->whlist); |
5afbbe0d AM |
23795 | + if (err && a->dst_inode && a->dst_btop != a->btgt) { |
23796 | + AuDbg("btop %d, btgt %d\n", a->dst_btop, a->btgt); | |
027c5e7a | 23797 | + au_set_h_dptr(a->dst_dentry, a->btgt, NULL); |
5afbbe0d | 23798 | + au_set_dbtop(a->dst_dentry, a->dst_btop); |
4a4d8108 | 23799 | + } |
027c5e7a | 23800 | +out_parent: |
f2c43d5f | 23801 | + if (!err) { |
8b6a4947 AM |
23802 | + if (d_unhashed(a->src_dentry)) |
23803 | + au_fset_ren(a->auren_flags, DROPPED_SRC); | |
23804 | + if (d_unhashed(a->dst_dentry)) | |
23805 | + au_fset_ren(a->auren_flags, DROPPED_DST); | |
f2c43d5f AM |
23806 | + if (!a->exchange) |
23807 | + d_move(a->src_dentry, a->dst_dentry); | |
8b6a4947 | 23808 | + else { |
f2c43d5f | 23809 | + d_exchange(a->src_dentry, a->dst_dentry); |
8b6a4947 AM |
23810 | + if (au_ftest_ren(a->auren_flags, DROPPED_DST)) |
23811 | + d_drop(a->dst_dentry); | |
23812 | + } | |
23813 | + if (au_ftest_ren(a->auren_flags, DROPPED_SRC)) | |
23814 | + d_drop(a->src_dentry); | |
f2c43d5f | 23815 | + } else { |
5afbbe0d | 23816 | + au_update_dbtop(a->dst_dentry); |
027c5e7a AM |
23817 | + if (!a->dst_inode) |
23818 | + d_drop(a->dst_dentry); | |
23819 | + } | |
f2c43d5f | 23820 | + if (au_ftest_ren(a->auren_flags, ISSAMEDIR)) |
4a4d8108 AM |
23821 | + di_write_unlock(a->dst_parent); |
23822 | + else | |
23823 | + di_write_unlock2(a->src_parent, a->dst_parent); | |
027c5e7a | 23824 | +out_unlock: |
4a4d8108 | 23825 | + aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry); |
4f0767ce | 23826 | +out_free: |
4a4d8108 AM |
23827 | + iput(a->dst_inode); |
23828 | + if (a->thargs) | |
23829 | + au_whtmp_rmdir_free(a->thargs); | |
1c60b727 | 23830 | + kfree(a); |
4f0767ce | 23831 | +out: |
4a4d8108 AM |
23832 | + AuTraceErr(err); |
23833 | + return err; | |
1308ab2a | 23834 | +} |
7f207e10 AM |
23835 | diff -urN /usr/share/empty/fs/aufs/Kconfig linux/fs/aufs/Kconfig |
23836 | --- /usr/share/empty/fs/aufs/Kconfig 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 23837 | +++ linux/fs/aufs/Kconfig 2018-06-04 09:08:09.181412645 +0200 |
2121bcd9 AM |
23838 | @@ -0,0 +1,199 @@ |
23839 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
23840 | +config AUFS_FS |
23841 | + tristate "Aufs (Advanced multi layered unification filesystem) support" | |
4a4d8108 AM |
23842 | + help |
23843 | + Aufs is a stackable unification filesystem such as Unionfs, | |
23844 | + which unifies several directories and provides a merged single | |
23845 | + directory. | |
23846 | + In the early days, aufs was entirely re-designed and | |
23847 | + re-implemented Unionfs Version 1.x series. Introducing many | |
23848 | + original ideas, approaches and improvements, it becomes totally | |
23849 | + different from Unionfs while keeping the basic features. | |
1facf9fc | 23850 | + |
4a4d8108 AM |
23851 | +if AUFS_FS |
23852 | +choice | |
23853 | + prompt "Maximum number of branches" | |
23854 | + default AUFS_BRANCH_MAX_127 | |
23855 | + help | |
23856 | + Specifies the maximum number of branches (or member directories) | |
23857 | + in a single aufs. The larger value consumes more system | |
23858 | + resources and has a minor impact to performance. | |
23859 | +config AUFS_BRANCH_MAX_127 | |
23860 | + bool "127" | |
23861 | + help | |
23862 | + Specifies the maximum number of branches (or member directories) | |
23863 | + in a single aufs. The larger value consumes more system | |
23864 | + resources and has a minor impact to performance. | |
23865 | +config AUFS_BRANCH_MAX_511 | |
23866 | + bool "511" | |
23867 | + help | |
23868 | + Specifies the maximum number of branches (or member directories) | |
23869 | + in a single aufs. The larger value consumes more system | |
23870 | + resources and has a minor impact to performance. | |
23871 | +config AUFS_BRANCH_MAX_1023 | |
23872 | + bool "1023" | |
23873 | + help | |
23874 | + Specifies the maximum number of branches (or member directories) | |
23875 | + in a single aufs. The larger value consumes more system | |
23876 | + resources and has a minor impact to performance. | |
23877 | +config AUFS_BRANCH_MAX_32767 | |
23878 | + bool "32767" | |
23879 | + help | |
23880 | + Specifies the maximum number of branches (or member directories) | |
23881 | + in a single aufs. The larger value consumes more system | |
23882 | + resources and has a minor impact to performance. | |
23883 | +endchoice | |
1facf9fc | 23884 | + |
e49829fe JR |
23885 | +config AUFS_SBILIST |
23886 | + bool | |
23887 | + depends on AUFS_MAGIC_SYSRQ || PROC_FS | |
23888 | + default y | |
23889 | + help | |
23890 | + Automatic configuration for internal use. | |
23891 | + When aufs supports Magic SysRq or /proc, enabled automatically. | |
23892 | + | |
4a4d8108 AM |
23893 | +config AUFS_HNOTIFY |
23894 | + bool "Detect direct branch access (bypassing aufs)" | |
23895 | + help | |
23896 | + If you want to modify files on branches directly, eg. bypassing aufs, | |
23897 | + and want aufs to detect the changes of them fully, then enable this | |
23898 | + option and use 'udba=notify' mount option. | |
7f207e10 | 23899 | + Currently there is only one available configuration, "fsnotify". |
4a4d8108 AM |
23900 | + It will have a negative impact to the performance. |
23901 | + See detail in aufs.5. | |
dece6358 | 23902 | + |
4a4d8108 AM |
23903 | +choice |
23904 | + prompt "method" if AUFS_HNOTIFY | |
23905 | + default AUFS_HFSNOTIFY | |
23906 | +config AUFS_HFSNOTIFY | |
23907 | + bool "fsnotify" | |
23908 | + select FSNOTIFY | |
4a4d8108 | 23909 | +endchoice |
1facf9fc | 23910 | + |
4a4d8108 AM |
23911 | +config AUFS_EXPORT |
23912 | + bool "NFS-exportable aufs" | |
2cbb1c4b | 23913 | + depends on EXPORTFS |
4a4d8108 AM |
23914 | + help |
23915 | + If you want to export your mounted aufs via NFS, then enable this | |
23916 | + option. There are several requirements for this configuration. | |
23917 | + See detail in aufs.5. | |
1facf9fc | 23918 | + |
4a4d8108 AM |
23919 | +config AUFS_INO_T_64 |
23920 | + bool | |
23921 | + depends on AUFS_EXPORT | |
23922 | + depends on 64BIT && !(ALPHA || S390) | |
23923 | + default y | |
23924 | + help | |
23925 | + Automatic configuration for internal use. | |
23926 | + /* typedef unsigned long/int __kernel_ino_t */ | |
23927 | + /* alpha and s390x are int */ | |
1facf9fc | 23928 | + |
c1595e42 JR |
23929 | +config AUFS_XATTR |
23930 | + bool "support for XATTR/EA (including Security Labels)" | |
23931 | + help | |
23932 | + If your branch fs supports XATTR/EA and you want to make them | |
23933 | + available in aufs too, then enable this opsion and specify the | |
23934 | + branch attributes for EA. | |
23935 | + See detail in aufs.5. | |
23936 | + | |
076b876e AM |
23937 | +config AUFS_FHSM |
23938 | + bool "File-based Hierarchical Storage Management" | |
23939 | + help | |
23940 | + Hierarchical Storage Management (or HSM) is a well-known feature | |
23941 | + in the storage world. Aufs provides this feature as file-based. | |
23942 | + with multiple branches. | |
23943 | + These multiple branches are prioritized, ie. the topmost one | |
23944 | + should be the fastest drive and be used heavily. | |
23945 | + | |
4a4d8108 AM |
23946 | +config AUFS_RDU |
23947 | + bool "Readdir in userspace" | |
23948 | + help | |
23949 | + Aufs has two methods to provide a merged view for a directory, | |
23950 | + by a user-space library and by kernel-space natively. The latter | |
23951 | + is always enabled but sometimes large and slow. | |
23952 | + If you enable this option, install the library in aufs2-util | |
23953 | + package, and set some environment variables for your readdir(3), | |
23954 | + then the work will be handled in user-space which generally | |
23955 | + shows better performance in most cases. | |
23956 | + See detail in aufs.5. | |
1facf9fc | 23957 | + |
8b6a4947 AM |
23958 | +config AUFS_DIRREN |
23959 | + bool "Workaround for rename(2)-ing a directory" | |
23960 | + help | |
23961 | + By default, aufs returns EXDEV error in renameing a dir who has | |
23962 | + his child on the lower branch, since it is a bad idea to issue | |
23963 | + rename(2) internally for every lower branch. But user may not | |
23964 | + accept this behaviour. So here is a workaround to allow such | |
23965 | + rename(2) and store some extra infromation on the writable | |
23966 | + branch. Obviously this costs high (and I don't like it). | |
23967 | + To use this feature, you need to enable this configuration AND | |
23968 | + to specify the mount option `dirren.' | |
23969 | + See details in aufs.5 and the design documents. | |
23970 | + | |
4a4d8108 AM |
23971 | +config AUFS_SHWH |
23972 | + bool "Show whiteouts" | |
23973 | + help | |
23974 | + If you want to make the whiteouts in aufs visible, then enable | |
23975 | + this option and specify 'shwh' mount option. Although it may | |
23976 | + sounds like philosophy or something, but in technically it | |
23977 | + simply shows the name of whiteout with keeping its behaviour. | |
1facf9fc | 23978 | + |
4a4d8108 AM |
23979 | +config AUFS_BR_RAMFS |
23980 | + bool "Ramfs (initramfs/rootfs) as an aufs branch" | |
23981 | + help | |
23982 | + If you want to use ramfs as an aufs branch fs, then enable this | |
23983 | + option. Generally tmpfs is recommended. | |
23984 | + Aufs prohibited them to be a branch fs by default, because | |
23985 | + initramfs becomes unusable after switch_root or something | |
23986 | + generally. If you sets initramfs as an aufs branch and boot your | |
23987 | + system by switch_root, you will meet a problem easily since the | |
23988 | + files in initramfs may be inaccessible. | |
23989 | + Unless you are going to use ramfs as an aufs branch fs without | |
23990 | + switch_root or something, leave it N. | |
1facf9fc | 23991 | + |
4a4d8108 AM |
23992 | +config AUFS_BR_FUSE |
23993 | + bool "Fuse fs as an aufs branch" | |
23994 | + depends on FUSE_FS | |
23995 | + select AUFS_POLL | |
23996 | + help | |
23997 | + If you want to use fuse-based userspace filesystem as an aufs | |
23998 | + branch fs, then enable this option. | |
23999 | + It implements the internal poll(2) operation which is | |
24000 | + implemented by fuse only (curretnly). | |
1facf9fc | 24001 | + |
4a4d8108 AM |
24002 | +config AUFS_POLL |
24003 | + bool | |
24004 | + help | |
24005 | + Automatic configuration for internal use. | |
1facf9fc | 24006 | + |
4a4d8108 AM |
24007 | +config AUFS_BR_HFSPLUS |
24008 | + bool "Hfsplus as an aufs branch" | |
24009 | + depends on HFSPLUS_FS | |
24010 | + default y | |
24011 | + help | |
24012 | + If you want to use hfsplus fs as an aufs branch fs, then enable | |
24013 | + this option. This option introduces a small overhead at | |
24014 | + copying-up a file on hfsplus. | |
1facf9fc | 24015 | + |
4a4d8108 AM |
24016 | +config AUFS_BDEV_LOOP |
24017 | + bool | |
24018 | + depends on BLK_DEV_LOOP | |
24019 | + default y | |
24020 | + help | |
24021 | + Automatic configuration for internal use. | |
24022 | + Convert =[ym] into =y. | |
1308ab2a | 24023 | + |
4a4d8108 AM |
24024 | +config AUFS_DEBUG |
24025 | + bool "Debug aufs" | |
24026 | + help | |
24027 | + Enable this to compile aufs internal debug code. | |
24028 | + It will have a negative impact to the performance. | |
24029 | + | |
24030 | +config AUFS_MAGIC_SYSRQ | |
24031 | + bool | |
24032 | + depends on AUFS_DEBUG && MAGIC_SYSRQ | |
24033 | + default y | |
24034 | + help | |
24035 | + Automatic configuration for internal use. | |
24036 | + When aufs supports Magic SysRq, enabled automatically. | |
24037 | +endif | |
7f207e10 AM |
24038 | diff -urN /usr/share/empty/fs/aufs/loop.c linux/fs/aufs/loop.c |
24039 | --- /usr/share/empty/fs/aufs/loop.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 24040 | +++ linux/fs/aufs/loop.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 24041 | @@ -0,0 +1,148 @@ |
cd7a4cd9 | 24042 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 24043 | +/* |
b00004a5 | 24044 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 24045 | + * |
24046 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24047 | + * it under the terms of the GNU General Public License as published by | |
24048 | + * the Free Software Foundation; either version 2 of the License, or | |
24049 | + * (at your option) any later version. | |
dece6358 AM |
24050 | + * |
24051 | + * This program is distributed in the hope that it will be useful, | |
24052 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24053 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24054 | + * GNU General Public License for more details. | |
24055 | + * | |
24056 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24057 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24058 | + */ |
24059 | + | |
24060 | +/* | |
24061 | + * support for loopback block device as a branch | |
24062 | + */ | |
24063 | + | |
1facf9fc | 24064 | +#include "aufs.h" |
24065 | + | |
392086de AM |
24066 | +/* added into drivers/block/loop.c */ |
24067 | +static struct file *(*backing_file_func)(struct super_block *sb); | |
24068 | + | |
1facf9fc | 24069 | +/* |
24070 | + * test if two lower dentries have overlapping branches. | |
24071 | + */ | |
b752ccd1 | 24072 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding) |
1facf9fc | 24073 | +{ |
b752ccd1 | 24074 | + struct super_block *h_sb; |
392086de AM |
24075 | + struct file *backing_file; |
24076 | + | |
24077 | + if (unlikely(!backing_file_func)) { | |
24078 | + /* don't load "loop" module here */ | |
24079 | + backing_file_func = symbol_get(loop_backing_file); | |
24080 | + if (unlikely(!backing_file_func)) | |
24081 | + /* "loop" module is not loaded */ | |
24082 | + return 0; | |
24083 | + } | |
1facf9fc | 24084 | + |
b752ccd1 | 24085 | + h_sb = h_adding->d_sb; |
392086de AM |
24086 | + backing_file = backing_file_func(h_sb); |
24087 | + if (!backing_file) | |
1facf9fc | 24088 | + return 0; |
24089 | + | |
2000de60 | 24090 | + h_adding = backing_file->f_path.dentry; |
b752ccd1 AM |
24091 | + /* |
24092 | + * h_adding can be local NFS. | |
24093 | + * in this case aufs cannot detect the loop. | |
24094 | + */ | |
24095 | + if (unlikely(h_adding->d_sb == sb)) | |
1facf9fc | 24096 | + return 1; |
b752ccd1 | 24097 | + return !!au_test_subdir(h_adding, sb->s_root); |
1facf9fc | 24098 | +} |
24099 | + | |
24100 | +/* true if a kernel thread named 'loop[0-9].*' accesses a file */ | |
24101 | +int au_test_loopback_kthread(void) | |
24102 | +{ | |
b752ccd1 AM |
24103 | + int ret; |
24104 | + struct task_struct *tsk = current; | |
a2a7ad62 | 24105 | + char c, comm[sizeof(tsk->comm)]; |
b752ccd1 AM |
24106 | + |
24107 | + ret = 0; | |
24108 | + if (tsk->flags & PF_KTHREAD) { | |
a2a7ad62 AM |
24109 | + get_task_comm(comm, tsk); |
24110 | + c = comm[4]; | |
b752ccd1 | 24111 | + ret = ('0' <= c && c <= '9' |
a2a7ad62 | 24112 | + && !strncmp(comm, "loop", 4)); |
b752ccd1 | 24113 | + } |
1facf9fc | 24114 | + |
b752ccd1 | 24115 | + return ret; |
1facf9fc | 24116 | +} |
87a755f4 AM |
24117 | + |
24118 | +/* ---------------------------------------------------------------------- */ | |
24119 | + | |
24120 | +#define au_warn_loopback_step 16 | |
24121 | +static int au_warn_loopback_nelem = au_warn_loopback_step; | |
24122 | +static unsigned long *au_warn_loopback_array; | |
24123 | + | |
24124 | +void au_warn_loopback(struct super_block *h_sb) | |
24125 | +{ | |
24126 | + int i, new_nelem; | |
24127 | + unsigned long *a, magic; | |
24128 | + static DEFINE_SPINLOCK(spin); | |
24129 | + | |
24130 | + magic = h_sb->s_magic; | |
24131 | + spin_lock(&spin); | |
24132 | + a = au_warn_loopback_array; | |
24133 | + for (i = 0; i < au_warn_loopback_nelem && *a; i++) | |
24134 | + if (a[i] == magic) { | |
24135 | + spin_unlock(&spin); | |
24136 | + return; | |
24137 | + } | |
24138 | + | |
24139 | + /* h_sb is new to us, print it */ | |
24140 | + if (i < au_warn_loopback_nelem) { | |
24141 | + a[i] = magic; | |
24142 | + goto pr; | |
24143 | + } | |
24144 | + | |
24145 | + /* expand the array */ | |
24146 | + new_nelem = au_warn_loopback_nelem + au_warn_loopback_step; | |
24147 | + a = au_kzrealloc(au_warn_loopback_array, | |
24148 | + au_warn_loopback_nelem * sizeof(unsigned long), | |
e2f27e51 AM |
24149 | + new_nelem * sizeof(unsigned long), GFP_ATOMIC, |
24150 | + /*may_shrink*/0); | |
87a755f4 AM |
24151 | + if (a) { |
24152 | + au_warn_loopback_nelem = new_nelem; | |
24153 | + au_warn_loopback_array = a; | |
24154 | + a[i] = magic; | |
24155 | + goto pr; | |
24156 | + } | |
24157 | + | |
24158 | + spin_unlock(&spin); | |
24159 | + AuWarn1("realloc failed, ignored\n"); | |
24160 | + return; | |
24161 | + | |
24162 | +pr: | |
24163 | + spin_unlock(&spin); | |
0c3ec466 AM |
24164 | + pr_warn("you may want to try another patch for loopback file " |
24165 | + "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic); | |
87a755f4 AM |
24166 | +} |
24167 | + | |
24168 | +int au_loopback_init(void) | |
24169 | +{ | |
24170 | + int err; | |
24171 | + struct super_block *sb __maybe_unused; | |
24172 | + | |
79b8bda9 | 24173 | + BUILD_BUG_ON(sizeof(sb->s_magic) != sizeof(unsigned long)); |
87a755f4 AM |
24174 | + |
24175 | + err = 0; | |
24176 | + au_warn_loopback_array = kcalloc(au_warn_loopback_step, | |
24177 | + sizeof(unsigned long), GFP_NOFS); | |
24178 | + if (unlikely(!au_warn_loopback_array)) | |
24179 | + err = -ENOMEM; | |
24180 | + | |
24181 | + return err; | |
24182 | +} | |
24183 | + | |
24184 | +void au_loopback_fin(void) | |
24185 | +{ | |
79b8bda9 AM |
24186 | + if (backing_file_func) |
24187 | + symbol_put(loop_backing_file); | |
1c60b727 | 24188 | + kfree(au_warn_loopback_array); |
87a755f4 | 24189 | +} |
7f207e10 AM |
24190 | diff -urN /usr/share/empty/fs/aufs/loop.h linux/fs/aufs/loop.h |
24191 | --- /usr/share/empty/fs/aufs/loop.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 24192 | +++ linux/fs/aufs/loop.h 2018-08-12 23:43:05.460124736 +0200 |
062440b3 AM |
24193 | @@ -0,0 +1,53 @@ |
24194 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 24195 | +/* |
b00004a5 | 24196 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 24197 | + * |
24198 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24199 | + * it under the terms of the GNU General Public License as published by | |
24200 | + * the Free Software Foundation; either version 2 of the License, or | |
24201 | + * (at your option) any later version. | |
dece6358 AM |
24202 | + * |
24203 | + * This program is distributed in the hope that it will be useful, | |
24204 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24205 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24206 | + * GNU General Public License for more details. | |
24207 | + * | |
24208 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24209 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24210 | + */ |
24211 | + | |
24212 | +/* | |
24213 | + * support for loopback mount as a branch | |
24214 | + */ | |
24215 | + | |
24216 | +#ifndef __AUFS_LOOP_H__ | |
24217 | +#define __AUFS_LOOP_H__ | |
24218 | + | |
24219 | +#ifdef __KERNEL__ | |
24220 | + | |
dece6358 AM |
24221 | +struct dentry; |
24222 | +struct super_block; | |
1facf9fc | 24223 | + |
24224 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
392086de AM |
24225 | +/* drivers/block/loop.c */ |
24226 | +struct file *loop_backing_file(struct super_block *sb); | |
24227 | + | |
1facf9fc | 24228 | +/* loop.c */ |
b752ccd1 | 24229 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding); |
1facf9fc | 24230 | +int au_test_loopback_kthread(void); |
87a755f4 AM |
24231 | +void au_warn_loopback(struct super_block *h_sb); |
24232 | + | |
24233 | +int au_loopback_init(void); | |
24234 | +void au_loopback_fin(void); | |
1facf9fc | 24235 | +#else |
4a4d8108 | 24236 | +AuStubInt0(au_test_loopback_overlap, struct super_block *sb, |
b752ccd1 | 24237 | + struct dentry *h_adding) |
4a4d8108 | 24238 | +AuStubInt0(au_test_loopback_kthread, void) |
87a755f4 AM |
24239 | +AuStubVoid(au_warn_loopback, struct super_block *h_sb) |
24240 | + | |
24241 | +AuStubInt0(au_loopback_init, void) | |
24242 | +AuStubVoid(au_loopback_fin, void) | |
1facf9fc | 24243 | +#endif /* BLK_DEV_LOOP */ |
24244 | + | |
24245 | +#endif /* __KERNEL__ */ | |
24246 | +#endif /* __AUFS_LOOP_H__ */ | |
7f207e10 AM |
24247 | diff -urN /usr/share/empty/fs/aufs/magic.mk linux/fs/aufs/magic.mk |
24248 | --- /usr/share/empty/fs/aufs/magic.mk 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 24249 | +++ linux/fs/aufs/magic.mk 2018-06-04 09:08:09.188079511 +0200 |
2121bcd9 AM |
24250 | @@ -0,0 +1,31 @@ |
24251 | +# SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 24252 | + |
24253 | +# defined in ${srctree}/fs/fuse/inode.c | |
24254 | +# tristate | |
24255 | +ifdef CONFIG_FUSE_FS | |
24256 | +ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546 | |
24257 | +endif | |
24258 | + | |
1facf9fc | 24259 | +# defined in ${srctree}/fs/xfs/xfs_sb.h |
24260 | +# tristate | |
24261 | +ifdef CONFIG_XFS_FS | |
24262 | +ccflags-y += -DXFS_SB_MAGIC=0x58465342 | |
24263 | +endif | |
24264 | + | |
24265 | +# defined in ${srctree}/fs/configfs/mount.c | |
24266 | +# tristate | |
24267 | +ifdef CONFIG_CONFIGFS_FS | |
24268 | +ccflags-y += -DCONFIGFS_MAGIC=0x62656570 | |
24269 | +endif | |
24270 | + | |
1facf9fc | 24271 | +# defined in ${srctree}/fs/ubifs/ubifs.h |
24272 | +# tristate | |
24273 | +ifdef CONFIG_UBIFS_FS | |
24274 | +ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905 | |
24275 | +endif | |
4a4d8108 AM |
24276 | + |
24277 | +# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h | |
24278 | +# tristate | |
24279 | +ifdef CONFIG_HFSPLUS_FS | |
24280 | +ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b | |
24281 | +endif | |
7f207e10 AM |
24282 | diff -urN /usr/share/empty/fs/aufs/Makefile linux/fs/aufs/Makefile |
24283 | --- /usr/share/empty/fs/aufs/Makefile 1970-01-01 01:00:00.000000000 +0100 | |
b00004a5 | 24284 | +++ linux/fs/aufs/Makefile 2018-06-04 09:08:09.181412645 +0200 |
2121bcd9 AM |
24285 | @@ -0,0 +1,46 @@ |
24286 | +# SPDX-License-Identifier: GPL-2.0 | |
4a4d8108 AM |
24287 | + |
24288 | +include ${src}/magic.mk | |
24289 | +ifeq (${CONFIG_AUFS_FS},m) | |
24290 | +include ${src}/conf.mk | |
24291 | +endif | |
24292 | +-include ${src}/priv_def.mk | |
24293 | + | |
24294 | +# cf. include/linux/kernel.h | |
24295 | +# enable pr_debug | |
24296 | +ccflags-y += -DDEBUG | |
f6c5ef8b AM |
24297 | +# sparse requires the full pathname |
24298 | +ifdef M | |
523b37e3 | 24299 | +ccflags-y += -include ${M}/../../include/uapi/linux/aufs_type.h |
f6c5ef8b | 24300 | +else |
523b37e3 | 24301 | +ccflags-y += -include ${srctree}/include/uapi/linux/aufs_type.h |
f6c5ef8b | 24302 | +endif |
4a4d8108 AM |
24303 | + |
24304 | +obj-$(CONFIG_AUFS_FS) += aufs.o | |
24305 | +aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \ | |
24306 | + wkq.o vfsub.o dcsub.o \ | |
e49829fe | 24307 | + cpup.o whout.o wbr_policy.o \ |
4a4d8108 AM |
24308 | + dinfo.o dentry.o \ |
24309 | + dynop.o \ | |
24310 | + finfo.o file.o f_op.o \ | |
24311 | + dir.o vdir.o \ | |
24312 | + iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \ | |
c2b27bf2 | 24313 | + mvdown.o ioctl.o |
4a4d8108 AM |
24314 | + |
24315 | +# all are boolean | |
e49829fe | 24316 | +aufs-$(CONFIG_PROC_FS) += procfs.o plink.o |
4a4d8108 AM |
24317 | +aufs-$(CONFIG_SYSFS) += sysfs.o |
24318 | +aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o | |
24319 | +aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o | |
24320 | +aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o | |
24321 | +aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o | |
4a4d8108 | 24322 | +aufs-$(CONFIG_AUFS_EXPORT) += export.o |
c1595e42 JR |
24323 | +aufs-$(CONFIG_AUFS_XATTR) += xattr.o |
24324 | +aufs-$(CONFIG_FS_POSIX_ACL) += posix_acl.o | |
8b6a4947 | 24325 | +aufs-$(CONFIG_AUFS_DIRREN) += dirren.o |
076b876e | 24326 | +aufs-$(CONFIG_AUFS_FHSM) += fhsm.o |
4a4d8108 AM |
24327 | +aufs-$(CONFIG_AUFS_POLL) += poll.o |
24328 | +aufs-$(CONFIG_AUFS_RDU) += rdu.o | |
4a4d8108 AM |
24329 | +aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o |
24330 | +aufs-$(CONFIG_AUFS_DEBUG) += debug.o | |
24331 | +aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o | |
7f207e10 AM |
24332 | diff -urN /usr/share/empty/fs/aufs/module.c linux/fs/aufs/module.c |
24333 | --- /usr/share/empty/fs/aufs/module.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 24334 | +++ linux/fs/aufs/module.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 24335 | @@ -0,0 +1,273 @@ |
cd7a4cd9 | 24336 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 24337 | +/* |
b00004a5 | 24338 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 24339 | + * |
24340 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24341 | + * it under the terms of the GNU General Public License as published by | |
24342 | + * the Free Software Foundation; either version 2 of the License, or | |
24343 | + * (at your option) any later version. | |
dece6358 AM |
24344 | + * |
24345 | + * This program is distributed in the hope that it will be useful, | |
24346 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24347 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24348 | + * GNU General Public License for more details. | |
24349 | + * | |
24350 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24351 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24352 | + */ |
24353 | + | |
24354 | +/* | |
24355 | + * module global variables and operations | |
24356 | + */ | |
24357 | + | |
24358 | +#include <linux/module.h> | |
24359 | +#include <linux/seq_file.h> | |
24360 | +#include "aufs.h" | |
24361 | + | |
e2f27e51 AM |
24362 | +/* shrinkable realloc */ |
24363 | +void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink) | |
1facf9fc | 24364 | +{ |
e2f27e51 AM |
24365 | + size_t sz; |
24366 | + int diff; | |
1facf9fc | 24367 | + |
e2f27e51 AM |
24368 | + sz = 0; |
24369 | + diff = -1; | |
24370 | + if (p) { | |
24371 | +#if 0 /* unused */ | |
24372 | + if (!new_sz) { | |
1c60b727 | 24373 | + kfree(p); |
e2f27e51 AM |
24374 | + p = NULL; |
24375 | + goto out; | |
24376 | + } | |
24377 | +#else | |
24378 | + AuDebugOn(!new_sz); | |
24379 | +#endif | |
24380 | + sz = ksize(p); | |
24381 | + diff = au_kmidx_sub(sz, new_sz); | |
24382 | + } | |
24383 | + if (sz && !diff) | |
24384 | + goto out; | |
24385 | + | |
24386 | + if (sz < new_sz) | |
24387 | + /* expand or SLOB */ | |
24388 | + p = krealloc(p, new_sz, gfp); | |
24389 | + else if (new_sz < sz && may_shrink) { | |
24390 | + /* shrink */ | |
24391 | + void *q; | |
24392 | + | |
24393 | + q = kmalloc(new_sz, gfp); | |
24394 | + if (q) { | |
24395 | + if (p) { | |
24396 | + memcpy(q, p, new_sz); | |
1c60b727 | 24397 | + kfree(p); |
e2f27e51 AM |
24398 | + } |
24399 | + p = q; | |
24400 | + } else | |
24401 | + p = NULL; | |
24402 | + } | |
24403 | + | |
24404 | +out: | |
24405 | + return p; | |
24406 | +} | |
24407 | + | |
24408 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, | |
24409 | + int may_shrink) | |
24410 | +{ | |
24411 | + p = au_krealloc(p, new_sz, gfp, may_shrink); | |
24412 | + if (p && new_sz > nused) | |
1facf9fc | 24413 | + memset(p + nused, 0, new_sz - nused); |
24414 | + return p; | |
24415 | +} | |
24416 | + | |
24417 | +/* ---------------------------------------------------------------------- */ | |
1facf9fc | 24418 | +/* |
24419 | + * aufs caches | |
24420 | + */ | |
1c60b727 | 24421 | +struct kmem_cache *au_cache[AuCache_Last]; |
5afbbe0d AM |
24422 | + |
24423 | +static void au_cache_fin(void) | |
24424 | +{ | |
24425 | + int i; | |
24426 | + | |
24427 | + /* | |
24428 | + * Make sure all delayed rcu free inodes are flushed before we | |
24429 | + * destroy cache. | |
24430 | + */ | |
24431 | + rcu_barrier(); | |
24432 | + | |
24433 | + /* excluding AuCache_HNOTIFY */ | |
24434 | + BUILD_BUG_ON(AuCache_HNOTIFY + 1 != AuCache_Last); | |
24435 | + for (i = 0; i < AuCache_HNOTIFY; i++) { | |
1c60b727 AM |
24436 | + kmem_cache_destroy(au_cache[i]); |
24437 | + au_cache[i] = NULL; | |
5afbbe0d AM |
24438 | + } |
24439 | +} | |
24440 | + | |
1facf9fc | 24441 | +static int __init au_cache_init(void) |
24442 | +{ | |
1c60b727 AM |
24443 | + au_cache[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once); |
24444 | + if (au_cache[AuCache_DINFO]) | |
027c5e7a | 24445 | + /* SLAB_DESTROY_BY_RCU */ |
1c60b727 | 24446 | + au_cache[AuCache_ICNTNR] = AuCacheCtor(au_icntnr, |
f0c0a007 | 24447 | + au_icntnr_init_once); |
1c60b727 AM |
24448 | + if (au_cache[AuCache_ICNTNR]) |
24449 | + au_cache[AuCache_FINFO] = AuCacheCtor(au_finfo, | |
f0c0a007 | 24450 | + au_fi_init_once); |
1c60b727 AM |
24451 | + if (au_cache[AuCache_FINFO]) |
24452 | + au_cache[AuCache_VDIR] = AuCache(au_vdir); | |
24453 | + if (au_cache[AuCache_VDIR]) | |
24454 | + au_cache[AuCache_DEHSTR] = AuCache(au_vdir_dehstr); | |
24455 | + if (au_cache[AuCache_DEHSTR]) | |
1facf9fc | 24456 | + return 0; |
24457 | + | |
5afbbe0d | 24458 | + au_cache_fin(); |
1facf9fc | 24459 | + return -ENOMEM; |
24460 | +} | |
24461 | + | |
1facf9fc | 24462 | +/* ---------------------------------------------------------------------- */ |
24463 | + | |
24464 | +int au_dir_roflags; | |
24465 | + | |
e49829fe | 24466 | +#ifdef CONFIG_AUFS_SBILIST |
1e00d052 AM |
24467 | +/* |
24468 | + * iterate_supers_type() doesn't protect us from | |
24469 | + * remounting (branch management) | |
24470 | + */ | |
8b6a4947 | 24471 | +struct hlist_bl_head au_sbilist; |
e49829fe JR |
24472 | +#endif |
24473 | + | |
1facf9fc | 24474 | +/* |
24475 | + * functions for module interface. | |
24476 | + */ | |
24477 | +MODULE_LICENSE("GPL"); | |
24478 | +/* MODULE_LICENSE("GPL v2"); */ | |
dece6358 | 24479 | +MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>"); |
1facf9fc | 24480 | +MODULE_DESCRIPTION(AUFS_NAME |
24481 | + " -- Advanced multi layered unification filesystem"); | |
24482 | +MODULE_VERSION(AUFS_VERSION); | |
c06a8ce3 | 24483 | +MODULE_ALIAS_FS(AUFS_NAME); |
1facf9fc | 24484 | + |
1facf9fc | 24485 | +/* this module parameter has no meaning when SYSFS is disabled */ |
24486 | +int sysaufs_brs = 1; | |
24487 | +MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN"); | |
cd7a4cd9 | 24488 | +module_param_named(brs, sysaufs_brs, int, 0444); |
1facf9fc | 24489 | + |
076b876e | 24490 | +/* this module parameter has no meaning when USER_NS is disabled */ |
8cdd5066 | 24491 | +bool au_userns; |
076b876e | 24492 | +MODULE_PARM_DESC(allow_userns, "allow unprivileged to mount under userns"); |
cd7a4cd9 | 24493 | +module_param_named(allow_userns, au_userns, bool, 0444); |
076b876e | 24494 | + |
1facf9fc | 24495 | +/* ---------------------------------------------------------------------- */ |
24496 | + | |
24497 | +static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */ | |
24498 | + | |
24499 | +int au_seq_path(struct seq_file *seq, struct path *path) | |
24500 | +{ | |
79b8bda9 AM |
24501 | + int err; |
24502 | + | |
24503 | + err = seq_path(seq, path, au_esc_chars); | |
1c60b727 | 24504 | + if (err >= 0) |
79b8bda9 | 24505 | + err = 0; |
1c60b727 | 24506 | + else |
79b8bda9 AM |
24507 | + err = -ENOMEM; |
24508 | + | |
24509 | + return err; | |
1facf9fc | 24510 | +} |
24511 | + | |
24512 | +/* ---------------------------------------------------------------------- */ | |
24513 | + | |
24514 | +static int __init aufs_init(void) | |
24515 | +{ | |
24516 | + int err, i; | |
24517 | + char *p; | |
24518 | + | |
24519 | + p = au_esc_chars; | |
24520 | + for (i = 1; i <= ' '; i++) | |
24521 | + *p++ = i; | |
24522 | + *p++ = '\\'; | |
24523 | + *p++ = '\x7f'; | |
24524 | + *p = 0; | |
24525 | + | |
24526 | + au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE); | |
24527 | + | |
b95c5147 AM |
24528 | + memcpy(aufs_iop_nogetattr, aufs_iop, sizeof(aufs_iop)); |
24529 | + for (i = 0; i < AuIop_Last; i++) | |
24530 | + aufs_iop_nogetattr[i].getattr = NULL; | |
24531 | + | |
1c60b727 | 24532 | + memset(au_cache, 0, sizeof(au_cache)); /* including hnotify */ |
f0c0a007 | 24533 | + |
e49829fe | 24534 | + au_sbilist_init(); |
1facf9fc | 24535 | + sysaufs_brs_init(); |
24536 | + au_debug_init(); | |
4a4d8108 | 24537 | + au_dy_init(); |
1facf9fc | 24538 | + err = sysaufs_init(); |
24539 | + if (unlikely(err)) | |
24540 | + goto out; | |
062440b3 | 24541 | + err = dbgaufs_init(); |
4f0767ce | 24542 | + if (unlikely(err)) |
953406b4 | 24543 | + goto out_sysaufs; |
062440b3 AM |
24544 | + err = au_procfs_init(); |
24545 | + if (unlikely(err)) | |
24546 | + goto out_dbgaufs; | |
e49829fe JR |
24547 | + err = au_wkq_init(); |
24548 | + if (unlikely(err)) | |
24549 | + goto out_procfs; | |
87a755f4 | 24550 | + err = au_loopback_init(); |
1facf9fc | 24551 | + if (unlikely(err)) |
24552 | + goto out_wkq; | |
87a755f4 AM |
24553 | + err = au_hnotify_init(); |
24554 | + if (unlikely(err)) | |
24555 | + goto out_loopback; | |
1facf9fc | 24556 | + err = au_sysrq_init(); |
24557 | + if (unlikely(err)) | |
24558 | + goto out_hin; | |
24559 | + err = au_cache_init(); | |
24560 | + if (unlikely(err)) | |
24561 | + goto out_sysrq; | |
076b876e AM |
24562 | + |
24563 | + aufs_fs_type.fs_flags |= au_userns ? FS_USERNS_MOUNT : 0; | |
1facf9fc | 24564 | + err = register_filesystem(&aufs_fs_type); |
24565 | + if (unlikely(err)) | |
24566 | + goto out_cache; | |
076b876e | 24567 | + |
4a4d8108 AM |
24568 | + /* since we define pr_fmt, call printk directly */ |
24569 | + printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n"); | |
1facf9fc | 24570 | + goto out; /* success */ |
24571 | + | |
4f0767ce | 24572 | +out_cache: |
1facf9fc | 24573 | + au_cache_fin(); |
4f0767ce | 24574 | +out_sysrq: |
1facf9fc | 24575 | + au_sysrq_fin(); |
4f0767ce | 24576 | +out_hin: |
4a4d8108 | 24577 | + au_hnotify_fin(); |
87a755f4 AM |
24578 | +out_loopback: |
24579 | + au_loopback_fin(); | |
4f0767ce | 24580 | +out_wkq: |
1facf9fc | 24581 | + au_wkq_fin(); |
e49829fe JR |
24582 | +out_procfs: |
24583 | + au_procfs_fin(); | |
062440b3 AM |
24584 | +out_dbgaufs: |
24585 | + dbgaufs_fin(); | |
4f0767ce | 24586 | +out_sysaufs: |
1facf9fc | 24587 | + sysaufs_fin(); |
4a4d8108 | 24588 | + au_dy_fin(); |
4f0767ce | 24589 | +out: |
1facf9fc | 24590 | + return err; |
24591 | +} | |
24592 | + | |
24593 | +static void __exit aufs_exit(void) | |
24594 | +{ | |
24595 | + unregister_filesystem(&aufs_fs_type); | |
24596 | + au_cache_fin(); | |
24597 | + au_sysrq_fin(); | |
4a4d8108 | 24598 | + au_hnotify_fin(); |
87a755f4 | 24599 | + au_loopback_fin(); |
1facf9fc | 24600 | + au_wkq_fin(); |
e49829fe | 24601 | + au_procfs_fin(); |
062440b3 | 24602 | + dbgaufs_fin(); |
1facf9fc | 24603 | + sysaufs_fin(); |
4a4d8108 | 24604 | + au_dy_fin(); |
1facf9fc | 24605 | +} |
24606 | + | |
24607 | +module_init(aufs_init); | |
24608 | +module_exit(aufs_exit); | |
7f207e10 AM |
24609 | diff -urN /usr/share/empty/fs/aufs/module.h linux/fs/aufs/module.h |
24610 | --- /usr/share/empty/fs/aufs/module.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 24611 | +++ linux/fs/aufs/module.h 2018-08-12 23:43:05.460124736 +0200 |
062440b3 AM |
24612 | @@ -0,0 +1,102 @@ |
24613 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 24614 | +/* |
b00004a5 | 24615 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 24616 | + * |
24617 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24618 | + * it under the terms of the GNU General Public License as published by | |
24619 | + * the Free Software Foundation; either version 2 of the License, or | |
24620 | + * (at your option) any later version. | |
dece6358 AM |
24621 | + * |
24622 | + * This program is distributed in the hope that it will be useful, | |
24623 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24624 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24625 | + * GNU General Public License for more details. | |
24626 | + * | |
24627 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 24628 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 24629 | + */ |
24630 | + | |
24631 | +/* | |
24632 | + * module initialization and module-global | |
24633 | + */ | |
24634 | + | |
24635 | +#ifndef __AUFS_MODULE_H__ | |
24636 | +#define __AUFS_MODULE_H__ | |
24637 | + | |
24638 | +#ifdef __KERNEL__ | |
24639 | + | |
24640 | +#include <linux/slab.h> | |
24641 | + | |
dece6358 AM |
24642 | +struct path; |
24643 | +struct seq_file; | |
24644 | + | |
1facf9fc | 24645 | +/* module parameters */ |
1facf9fc | 24646 | +extern int sysaufs_brs; |
8cdd5066 | 24647 | +extern bool au_userns; |
1facf9fc | 24648 | + |
24649 | +/* ---------------------------------------------------------------------- */ | |
24650 | + | |
24651 | +extern int au_dir_roflags; | |
24652 | + | |
e2f27e51 AM |
24653 | +void *au_krealloc(void *p, unsigned int new_sz, gfp_t gfp, int may_shrink); |
24654 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp, | |
24655 | + int may_shrink); | |
24656 | + | |
24657 | +static inline int au_kmidx_sub(size_t sz, size_t new_sz) | |
24658 | +{ | |
24659 | +#ifndef CONFIG_SLOB | |
24660 | + return kmalloc_index(sz) - kmalloc_index(new_sz); | |
24661 | +#else | |
24662 | + return -1; /* SLOB is untested */ | |
24663 | +#endif | |
24664 | +} | |
24665 | + | |
1facf9fc | 24666 | +int au_seq_path(struct seq_file *seq, struct path *path); |
24667 | + | |
e49829fe JR |
24668 | +#ifdef CONFIG_PROC_FS |
24669 | +/* procfs.c */ | |
24670 | +int __init au_procfs_init(void); | |
24671 | +void au_procfs_fin(void); | |
24672 | +#else | |
24673 | +AuStubInt0(au_procfs_init, void); | |
24674 | +AuStubVoid(au_procfs_fin, void); | |
24675 | +#endif | |
24676 | + | |
4f0767ce JR |
24677 | +/* ---------------------------------------------------------------------- */ |
24678 | + | |
1c60b727 | 24679 | +/* kmem cache */ |
1facf9fc | 24680 | +enum { |
24681 | + AuCache_DINFO, | |
24682 | + AuCache_ICNTNR, | |
24683 | + AuCache_FINFO, | |
24684 | + AuCache_VDIR, | |
24685 | + AuCache_DEHSTR, | |
7eafdf33 | 24686 | + AuCache_HNOTIFY, /* must be last */ |
1facf9fc | 24687 | + AuCache_Last |
24688 | +}; | |
24689 | + | |
1c60b727 | 24690 | +extern struct kmem_cache *au_cache[AuCache_Last]; |
f0c0a007 | 24691 | + |
4a4d8108 AM |
24692 | +#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) |
24693 | +#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) | |
24694 | +#define AuCacheCtor(type, ctor) \ | |
24695 | + kmem_cache_create(#type, sizeof(struct type), \ | |
24696 | + __alignof__(struct type), AuCacheFlags, ctor) | |
1facf9fc | 24697 | + |
1facf9fc | 24698 | +#define AuCacheFuncs(name, index) \ |
4a4d8108 | 24699 | +static inline struct au_##name *au_cache_alloc_##name(void) \ |
1c60b727 | 24700 | +{ return kmem_cache_alloc(au_cache[AuCache_##index], GFP_NOFS); } \ |
4a4d8108 | 24701 | +static inline void au_cache_free_##name(struct au_##name *p) \ |
1c60b727 | 24702 | +{ kmem_cache_free(au_cache[AuCache_##index], p); } |
1facf9fc | 24703 | + |
24704 | +AuCacheFuncs(dinfo, DINFO); | |
24705 | +AuCacheFuncs(icntnr, ICNTNR); | |
24706 | +AuCacheFuncs(finfo, FINFO); | |
24707 | +AuCacheFuncs(vdir, VDIR); | |
4a4d8108 AM |
24708 | +AuCacheFuncs(vdir_dehstr, DEHSTR); |
24709 | +#ifdef CONFIG_AUFS_HNOTIFY | |
24710 | +AuCacheFuncs(hnotify, HNOTIFY); | |
24711 | +#endif | |
1facf9fc | 24712 | + |
4a4d8108 AM |
24713 | +#endif /* __KERNEL__ */ |
24714 | +#endif /* __AUFS_MODULE_H__ */ | |
c2b27bf2 AM |
24715 | diff -urN /usr/share/empty/fs/aufs/mvdown.c linux/fs/aufs/mvdown.c |
24716 | --- /usr/share/empty/fs/aufs/mvdown.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 24717 | +++ linux/fs/aufs/mvdown.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 24718 | @@ -0,0 +1,705 @@ |
cd7a4cd9 | 24719 | +// SPDX-License-Identifier: GPL-2.0 |
c2b27bf2 | 24720 | +/* |
b00004a5 | 24721 | + * Copyright (C) 2011-2018 Junjiro R. Okajima |
c2b27bf2 AM |
24722 | + * |
24723 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24724 | + * it under the terms of the GNU General Public License as published by | |
24725 | + * the Free Software Foundation; either version 2 of the License, or | |
24726 | + * (at your option) any later version. | |
24727 | + * | |
24728 | + * This program is distributed in the hope that it will be useful, | |
24729 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24730 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24731 | + * GNU General Public License for more details. | |
24732 | + * | |
24733 | + * You should have received a copy of the GNU General Public License | |
523b37e3 AM |
24734 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
24735 | + */ | |
24736 | + | |
24737 | +/* | |
24738 | + * move-down, opposite of copy-up | |
c2b27bf2 AM |
24739 | + */ |
24740 | + | |
24741 | +#include "aufs.h" | |
24742 | + | |
c2b27bf2 AM |
24743 | +struct au_mvd_args { |
24744 | + struct { | |
c2b27bf2 AM |
24745 | + struct super_block *h_sb; |
24746 | + struct dentry *h_parent; | |
24747 | + struct au_hinode *hdir; | |
392086de | 24748 | + struct inode *h_dir, *h_inode; |
c1595e42 | 24749 | + struct au_pin pin; |
c2b27bf2 AM |
24750 | + } info[AUFS_MVDOWN_NARRAY]; |
24751 | + | |
24752 | + struct aufs_mvdown mvdown; | |
24753 | + struct dentry *dentry, *parent; | |
24754 | + struct inode *inode, *dir; | |
24755 | + struct super_block *sb; | |
24756 | + aufs_bindex_t bopq, bwh, bfound; | |
24757 | + unsigned char rename_lock; | |
c2b27bf2 AM |
24758 | +}; |
24759 | + | |
392086de | 24760 | +#define mvd_errno mvdown.au_errno |
076b876e AM |
24761 | +#define mvd_bsrc mvdown.stbr[AUFS_MVDOWN_UPPER].bindex |
24762 | +#define mvd_src_brid mvdown.stbr[AUFS_MVDOWN_UPPER].brid | |
24763 | +#define mvd_bdst mvdown.stbr[AUFS_MVDOWN_LOWER].bindex | |
24764 | +#define mvd_dst_brid mvdown.stbr[AUFS_MVDOWN_LOWER].brid | |
c2b27bf2 | 24765 | + |
392086de AM |
24766 | +#define mvd_h_src_sb info[AUFS_MVDOWN_UPPER].h_sb |
24767 | +#define mvd_h_src_parent info[AUFS_MVDOWN_UPPER].h_parent | |
24768 | +#define mvd_hdir_src info[AUFS_MVDOWN_UPPER].hdir | |
24769 | +#define mvd_h_src_dir info[AUFS_MVDOWN_UPPER].h_dir | |
24770 | +#define mvd_h_src_inode info[AUFS_MVDOWN_UPPER].h_inode | |
c1595e42 | 24771 | +#define mvd_pin_src info[AUFS_MVDOWN_UPPER].pin |
392086de AM |
24772 | + |
24773 | +#define mvd_h_dst_sb info[AUFS_MVDOWN_LOWER].h_sb | |
24774 | +#define mvd_h_dst_parent info[AUFS_MVDOWN_LOWER].h_parent | |
24775 | +#define mvd_hdir_dst info[AUFS_MVDOWN_LOWER].hdir | |
24776 | +#define mvd_h_dst_dir info[AUFS_MVDOWN_LOWER].h_dir | |
24777 | +#define mvd_h_dst_inode info[AUFS_MVDOWN_LOWER].h_inode | |
c1595e42 | 24778 | +#define mvd_pin_dst info[AUFS_MVDOWN_LOWER].pin |
c2b27bf2 AM |
24779 | + |
24780 | +#define AU_MVD_PR(flag, ...) do { \ | |
24781 | + if (flag) \ | |
24782 | + pr_err(__VA_ARGS__); \ | |
24783 | + } while (0) | |
24784 | + | |
076b876e AM |
24785 | +static int find_lower_writable(struct au_mvd_args *a) |
24786 | +{ | |
24787 | + struct super_block *sb; | |
5afbbe0d | 24788 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
24789 | + struct au_branch *br; |
24790 | + | |
24791 | + sb = a->sb; | |
24792 | + bindex = a->mvd_bsrc; | |
5afbbe0d | 24793 | + bbot = au_sbbot(sb); |
076b876e | 24794 | + if (a->mvdown.flags & AUFS_MVDOWN_FHSM_LOWER) |
5afbbe0d | 24795 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e AM |
24796 | + br = au_sbr(sb, bindex); |
24797 | + if (au_br_fhsm(br->br_perm) | |
8b6a4947 | 24798 | + && !sb_rdonly(au_br_sb(br))) |
076b876e AM |
24799 | + return bindex; |
24800 | + } | |
24801 | + else if (!(a->mvdown.flags & AUFS_MVDOWN_ROLOWER)) | |
5afbbe0d | 24802 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e AM |
24803 | + br = au_sbr(sb, bindex); |
24804 | + if (!au_br_rdonly(br)) | |
24805 | + return bindex; | |
24806 | + } | |
24807 | + else | |
5afbbe0d | 24808 | + for (bindex++; bindex <= bbot; bindex++) { |
076b876e | 24809 | + br = au_sbr(sb, bindex); |
8b6a4947 | 24810 | + if (!sb_rdonly(au_br_sb(br))) { |
076b876e AM |
24811 | + if (au_br_rdonly(br)) |
24812 | + a->mvdown.flags | |
24813 | + |= AUFS_MVDOWN_ROLOWER_R; | |
24814 | + return bindex; | |
24815 | + } | |
24816 | + } | |
24817 | + | |
24818 | + return -1; | |
24819 | +} | |
24820 | + | |
c2b27bf2 | 24821 | +/* make the parent dir on bdst */ |
392086de | 24822 | +static int au_do_mkdir(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
24823 | +{ |
24824 | + int err; | |
24825 | + | |
24826 | + err = 0; | |
24827 | + a->mvd_hdir_src = au_hi(a->dir, a->mvd_bsrc); | |
24828 | + a->mvd_hdir_dst = au_hi(a->dir, a->mvd_bdst); | |
24829 | + a->mvd_h_src_parent = au_h_dptr(a->parent, a->mvd_bsrc); | |
24830 | + a->mvd_h_dst_parent = NULL; | |
5afbbe0d | 24831 | + if (au_dbbot(a->parent) >= a->mvd_bdst) |
c2b27bf2 AM |
24832 | + a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); |
24833 | + if (!a->mvd_h_dst_parent) { | |
24834 | + err = au_cpdown_dirs(a->dentry, a->mvd_bdst); | |
24835 | + if (unlikely(err)) { | |
392086de | 24836 | + AU_MVD_PR(dmsg, "cpdown_dirs failed\n"); |
c2b27bf2 AM |
24837 | + goto out; |
24838 | + } | |
24839 | + a->mvd_h_dst_parent = au_h_dptr(a->parent, a->mvd_bdst); | |
24840 | + } | |
24841 | + | |
24842 | +out: | |
24843 | + AuTraceErr(err); | |
24844 | + return err; | |
24845 | +} | |
24846 | + | |
24847 | +/* lock them all */ | |
392086de | 24848 | +static int au_do_lock(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
24849 | +{ |
24850 | + int err; | |
24851 | + struct dentry *h_trap; | |
24852 | + | |
24853 | + a->mvd_h_src_sb = au_sbr_sb(a->sb, a->mvd_bsrc); | |
24854 | + a->mvd_h_dst_sb = au_sbr_sb(a->sb, a->mvd_bdst); | |
c1595e42 JR |
24855 | + err = au_pin(&a->mvd_pin_dst, a->dentry, a->mvd_bdst, |
24856 | + au_opt_udba(a->sb), | |
24857 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
24858 | + AuTraceErr(err); | |
24859 | + if (unlikely(err)) { | |
24860 | + AU_MVD_PR(dmsg, "pin_dst failed\n"); | |
24861 | + goto out; | |
24862 | + } | |
24863 | + | |
c2b27bf2 AM |
24864 | + if (a->mvd_h_src_sb != a->mvd_h_dst_sb) { |
24865 | + a->rename_lock = 0; | |
c1595e42 JR |
24866 | + au_pin_init(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, |
24867 | + AuLsc_DI_PARENT, AuLsc_I_PARENT3, | |
24868 | + au_opt_udba(a->sb), | |
24869 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
24870 | + err = au_do_pin(&a->mvd_pin_src); | |
24871 | + AuTraceErr(err); | |
5527c038 | 24872 | + a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); |
c1595e42 JR |
24873 | + if (unlikely(err)) { |
24874 | + AU_MVD_PR(dmsg, "pin_src failed\n"); | |
24875 | + goto out_dst; | |
24876 | + } | |
24877 | + goto out; /* success */ | |
c2b27bf2 AM |
24878 | + } |
24879 | + | |
c2b27bf2 | 24880 | + a->rename_lock = 1; |
c1595e42 JR |
24881 | + au_pin_hdir_unlock(&a->mvd_pin_dst); |
24882 | + err = au_pin(&a->mvd_pin_src, a->dentry, a->mvd_bsrc, | |
24883 | + au_opt_udba(a->sb), | |
24884 | + AuPin_MNT_WRITE | AuPin_DI_LOCKED); | |
24885 | + AuTraceErr(err); | |
5527c038 | 24886 | + a->mvd_h_src_dir = d_inode(a->mvd_h_src_parent); |
c1595e42 JR |
24887 | + if (unlikely(err)) { |
24888 | + AU_MVD_PR(dmsg, "pin_src failed\n"); | |
24889 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
24890 | + goto out_dst; | |
24891 | + } | |
24892 | + au_pin_hdir_unlock(&a->mvd_pin_src); | |
c2b27bf2 AM |
24893 | + h_trap = vfsub_lock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, |
24894 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
24895 | + if (h_trap) { | |
24896 | + err = (h_trap != a->mvd_h_src_parent); | |
24897 | + if (err) | |
24898 | + err = (h_trap != a->mvd_h_dst_parent); | |
24899 | + } | |
24900 | + BUG_ON(err); /* it should never happen */ | |
c1595e42 JR |
24901 | + if (unlikely(a->mvd_h_src_dir != au_pinned_h_dir(&a->mvd_pin_src))) { |
24902 | + err = -EBUSY; | |
24903 | + AuTraceErr(err); | |
24904 | + vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, | |
24905 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
24906 | + au_pin_hdir_lock(&a->mvd_pin_src); | |
24907 | + au_unpin(&a->mvd_pin_src); | |
24908 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
24909 | + goto out_dst; | |
24910 | + } | |
24911 | + goto out; /* success */ | |
c2b27bf2 | 24912 | + |
c1595e42 JR |
24913 | +out_dst: |
24914 | + au_unpin(&a->mvd_pin_dst); | |
c2b27bf2 AM |
24915 | +out: |
24916 | + AuTraceErr(err); | |
24917 | + return err; | |
24918 | +} | |
24919 | + | |
392086de | 24920 | +static void au_do_unlock(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 | 24921 | +{ |
c1595e42 JR |
24922 | + if (!a->rename_lock) |
24923 | + au_unpin(&a->mvd_pin_src); | |
24924 | + else { | |
c2b27bf2 AM |
24925 | + vfsub_unlock_rename(a->mvd_h_src_parent, a->mvd_hdir_src, |
24926 | + a->mvd_h_dst_parent, a->mvd_hdir_dst); | |
c1595e42 JR |
24927 | + au_pin_hdir_lock(&a->mvd_pin_src); |
24928 | + au_unpin(&a->mvd_pin_src); | |
24929 | + au_pin_hdir_lock(&a->mvd_pin_dst); | |
24930 | + } | |
24931 | + au_unpin(&a->mvd_pin_dst); | |
c2b27bf2 AM |
24932 | +} |
24933 | + | |
24934 | +/* copy-down the file */ | |
392086de | 24935 | +static int au_do_cpdown(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
24936 | +{ |
24937 | + int err; | |
24938 | + struct au_cp_generic cpg = { | |
24939 | + .dentry = a->dentry, | |
24940 | + .bdst = a->mvd_bdst, | |
24941 | + .bsrc = a->mvd_bsrc, | |
24942 | + .len = -1, | |
c1595e42 | 24943 | + .pin = &a->mvd_pin_dst, |
c2b27bf2 AM |
24944 | + .flags = AuCpup_DTIME | AuCpup_HOPEN |
24945 | + }; | |
24946 | + | |
24947 | + AuDbg("b%d, b%d\n", cpg.bsrc, cpg.bdst); | |
392086de AM |
24948 | + if (a->mvdown.flags & AUFS_MVDOWN_OWLOWER) |
24949 | + au_fset_cpup(cpg.flags, OVERWRITE); | |
24950 | + if (a->mvdown.flags & AUFS_MVDOWN_ROLOWER) | |
24951 | + au_fset_cpup(cpg.flags, RWDST); | |
c2b27bf2 AM |
24952 | + err = au_sio_cpdown_simple(&cpg); |
24953 | + if (unlikely(err)) | |
392086de | 24954 | + AU_MVD_PR(dmsg, "cpdown failed\n"); |
c2b27bf2 AM |
24955 | + |
24956 | + AuTraceErr(err); | |
24957 | + return err; | |
24958 | +} | |
24959 | + | |
24960 | +/* | |
24961 | + * unlink the whiteout on bdst if exist which may be created by UDBA while we | |
24962 | + * were sleeping | |
24963 | + */ | |
392086de | 24964 | +static int au_do_unlink_wh(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
24965 | +{ |
24966 | + int err; | |
24967 | + struct path h_path; | |
24968 | + struct au_branch *br; | |
523b37e3 | 24969 | + struct inode *delegated; |
c2b27bf2 AM |
24970 | + |
24971 | + br = au_sbr(a->sb, a->mvd_bdst); | |
24972 | + h_path.dentry = au_wh_lkup(a->mvd_h_dst_parent, &a->dentry->d_name, br); | |
24973 | + err = PTR_ERR(h_path.dentry); | |
24974 | + if (IS_ERR(h_path.dentry)) { | |
392086de | 24975 | + AU_MVD_PR(dmsg, "wh_lkup failed\n"); |
c2b27bf2 AM |
24976 | + goto out; |
24977 | + } | |
24978 | + | |
24979 | + err = 0; | |
5527c038 | 24980 | + if (d_is_positive(h_path.dentry)) { |
c2b27bf2 | 24981 | + h_path.mnt = au_br_mnt(br); |
523b37e3 | 24982 | + delegated = NULL; |
5527c038 | 24983 | + err = vfsub_unlink(d_inode(a->mvd_h_dst_parent), &h_path, |
523b37e3 AM |
24984 | + &delegated, /*force*/0); |
24985 | + if (unlikely(err == -EWOULDBLOCK)) { | |
24986 | + pr_warn("cannot retry for NFSv4 delegation" | |
24987 | + " for an internal unlink\n"); | |
24988 | + iput(delegated); | |
24989 | + } | |
c2b27bf2 | 24990 | + if (unlikely(err)) |
392086de | 24991 | + AU_MVD_PR(dmsg, "wh_unlink failed\n"); |
c2b27bf2 AM |
24992 | + } |
24993 | + dput(h_path.dentry); | |
24994 | + | |
24995 | +out: | |
24996 | + AuTraceErr(err); | |
24997 | + return err; | |
24998 | +} | |
24999 | + | |
25000 | +/* | |
25001 | + * unlink the topmost h_dentry | |
c2b27bf2 | 25002 | + */ |
392086de | 25003 | +static int au_do_unlink(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25004 | +{ |
25005 | + int err; | |
25006 | + struct path h_path; | |
523b37e3 | 25007 | + struct inode *delegated; |
c2b27bf2 AM |
25008 | + |
25009 | + h_path.mnt = au_sbr_mnt(a->sb, a->mvd_bsrc); | |
25010 | + h_path.dentry = au_h_dptr(a->dentry, a->mvd_bsrc); | |
523b37e3 AM |
25011 | + delegated = NULL; |
25012 | + err = vfsub_unlink(a->mvd_h_src_dir, &h_path, &delegated, /*force*/0); | |
25013 | + if (unlikely(err == -EWOULDBLOCK)) { | |
25014 | + pr_warn("cannot retry for NFSv4 delegation" | |
25015 | + " for an internal unlink\n"); | |
25016 | + iput(delegated); | |
25017 | + } | |
c2b27bf2 | 25018 | + if (unlikely(err)) |
392086de | 25019 | + AU_MVD_PR(dmsg, "unlink failed\n"); |
c2b27bf2 AM |
25020 | + |
25021 | + AuTraceErr(err); | |
25022 | + return err; | |
25023 | +} | |
25024 | + | |
076b876e AM |
25025 | +/* Since mvdown succeeded, we ignore an error of this function */ |
25026 | +static void au_do_stfs(const unsigned char dmsg, struct au_mvd_args *a) | |
25027 | +{ | |
25028 | + int err; | |
25029 | + struct au_branch *br; | |
25030 | + | |
25031 | + a->mvdown.flags |= AUFS_MVDOWN_STFS_FAILED; | |
25032 | + br = au_sbr(a->sb, a->mvd_bsrc); | |
25033 | + err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_UPPER].stfs); | |
25034 | + if (!err) { | |
25035 | + br = au_sbr(a->sb, a->mvd_bdst); | |
25036 | + a->mvdown.stbr[AUFS_MVDOWN_LOWER].brid = br->br_id; | |
25037 | + err = au_br_stfs(br, &a->mvdown.stbr[AUFS_MVDOWN_LOWER].stfs); | |
25038 | + } | |
25039 | + if (!err) | |
25040 | + a->mvdown.flags &= ~AUFS_MVDOWN_STFS_FAILED; | |
25041 | + else | |
25042 | + AU_MVD_PR(dmsg, "statfs failed (%d), ignored\n", err); | |
25043 | +} | |
25044 | + | |
c2b27bf2 AM |
25045 | +/* |
25046 | + * copy-down the file and unlink the bsrc file. | |
25047 | + * - unlink the bdst whout if exist | |
25048 | + * - copy-down the file (with whtmp name and rename) | |
25049 | + * - unlink the bsrc file | |
25050 | + */ | |
392086de | 25051 | +static int au_do_mvdown(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25052 | +{ |
25053 | + int err; | |
25054 | + | |
392086de | 25055 | + err = au_do_mkdir(dmsg, a); |
c2b27bf2 | 25056 | + if (!err) |
392086de | 25057 | + err = au_do_lock(dmsg, a); |
c2b27bf2 AM |
25058 | + if (unlikely(err)) |
25059 | + goto out; | |
25060 | + | |
25061 | + /* | |
25062 | + * do not revert the activities we made on bdst since they should be | |
25063 | + * harmless in aufs. | |
25064 | + */ | |
25065 | + | |
392086de | 25066 | + err = au_do_cpdown(dmsg, a); |
c2b27bf2 | 25067 | + if (!err) |
392086de AM |
25068 | + err = au_do_unlink_wh(dmsg, a); |
25069 | + if (!err && !(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) | |
25070 | + err = au_do_unlink(dmsg, a); | |
c2b27bf2 AM |
25071 | + if (unlikely(err)) |
25072 | + goto out_unlock; | |
25073 | + | |
c1595e42 JR |
25074 | + AuDbg("%pd2, 0x%x, %d --> %d\n", |
25075 | + a->dentry, a->mvdown.flags, a->mvd_bsrc, a->mvd_bdst); | |
076b876e AM |
25076 | + if (find_lower_writable(a) < 0) |
25077 | + a->mvdown.flags |= AUFS_MVDOWN_BOTTOM; | |
25078 | + | |
25079 | + if (a->mvdown.flags & AUFS_MVDOWN_STFS) | |
25080 | + au_do_stfs(dmsg, a); | |
25081 | + | |
c2b27bf2 | 25082 | + /* maintain internal array */ |
392086de AM |
25083 | + if (!(a->mvdown.flags & AUFS_MVDOWN_KUPPER)) { |
25084 | + au_set_h_dptr(a->dentry, a->mvd_bsrc, NULL); | |
5afbbe0d | 25085 | + au_set_dbtop(a->dentry, a->mvd_bdst); |
392086de | 25086 | + au_set_h_iptr(a->inode, a->mvd_bsrc, NULL, /*flags*/0); |
5afbbe0d | 25087 | + au_set_ibtop(a->inode, a->mvd_bdst); |
79b8bda9 AM |
25088 | + } else { |
25089 | + /* hide the lower */ | |
25090 | + au_set_h_dptr(a->dentry, a->mvd_bdst, NULL); | |
5afbbe0d | 25091 | + au_set_dbbot(a->dentry, a->mvd_bsrc); |
79b8bda9 | 25092 | + au_set_h_iptr(a->inode, a->mvd_bdst, NULL, /*flags*/0); |
5afbbe0d | 25093 | + au_set_ibbot(a->inode, a->mvd_bsrc); |
392086de | 25094 | + } |
5afbbe0d AM |
25095 | + if (au_dbbot(a->dentry) < a->mvd_bdst) |
25096 | + au_set_dbbot(a->dentry, a->mvd_bdst); | |
25097 | + if (au_ibbot(a->inode) < a->mvd_bdst) | |
25098 | + au_set_ibbot(a->inode, a->mvd_bdst); | |
c2b27bf2 AM |
25099 | + |
25100 | +out_unlock: | |
392086de | 25101 | + au_do_unlock(dmsg, a); |
c2b27bf2 AM |
25102 | +out: |
25103 | + AuTraceErr(err); | |
25104 | + return err; | |
25105 | +} | |
25106 | + | |
25107 | +/* ---------------------------------------------------------------------- */ | |
25108 | + | |
c2b27bf2 | 25109 | +/* make sure the file is idle */ |
392086de | 25110 | +static int au_mvd_args_busy(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25111 | +{ |
25112 | + int err, plinked; | |
c2b27bf2 AM |
25113 | + |
25114 | + err = 0; | |
c2b27bf2 | 25115 | + plinked = !!au_opt_test(au_mntflags(a->sb), PLINK); |
5afbbe0d | 25116 | + if (au_dbtop(a->dentry) == a->mvd_bsrc |
c1595e42 | 25117 | + && au_dcount(a->dentry) == 1 |
c2b27bf2 | 25118 | + && atomic_read(&a->inode->i_count) == 1 |
392086de | 25119 | + /* && a->mvd_h_src_inode->i_nlink == 1 */ |
c2b27bf2 AM |
25120 | + && (!plinked || !au_plink_test(a->inode)) |
25121 | + && a->inode->i_nlink == 1) | |
25122 | + goto out; | |
25123 | + | |
25124 | + err = -EBUSY; | |
392086de | 25125 | + AU_MVD_PR(dmsg, |
c1595e42 | 25126 | + "b%d, d{b%d, c%d?}, i{c%d?, l%u}, hi{l%u}, p{%d, %d}\n", |
5afbbe0d | 25127 | + a->mvd_bsrc, au_dbtop(a->dentry), au_dcount(a->dentry), |
c2b27bf2 | 25128 | + atomic_read(&a->inode->i_count), a->inode->i_nlink, |
392086de | 25129 | + a->mvd_h_src_inode->i_nlink, |
c2b27bf2 AM |
25130 | + plinked, plinked ? au_plink_test(a->inode) : 0); |
25131 | + | |
25132 | +out: | |
25133 | + AuTraceErr(err); | |
25134 | + return err; | |
25135 | +} | |
25136 | + | |
25137 | +/* make sure the parent dir is fine */ | |
392086de | 25138 | +static int au_mvd_args_parent(const unsigned char dmsg, |
c2b27bf2 AM |
25139 | + struct au_mvd_args *a) |
25140 | +{ | |
25141 | + int err; | |
25142 | + aufs_bindex_t bindex; | |
25143 | + | |
25144 | + err = 0; | |
25145 | + if (unlikely(au_alive_dir(a->parent))) { | |
25146 | + err = -ENOENT; | |
392086de | 25147 | + AU_MVD_PR(dmsg, "parent dir is dead\n"); |
c2b27bf2 AM |
25148 | + goto out; |
25149 | + } | |
25150 | + | |
25151 | + a->bopq = au_dbdiropq(a->parent); | |
25152 | + bindex = au_wbr_nonopq(a->dentry, a->mvd_bdst); | |
25153 | + AuDbg("b%d\n", bindex); | |
25154 | + if (unlikely((bindex >= 0 && bindex < a->mvd_bdst) | |
25155 | + || (a->bopq != -1 && a->bopq < a->mvd_bdst))) { | |
25156 | + err = -EINVAL; | |
392086de AM |
25157 | + a->mvd_errno = EAU_MVDOWN_OPAQUE; |
25158 | + AU_MVD_PR(dmsg, "ancestor is opaque b%d, b%d\n", | |
c2b27bf2 AM |
25159 | + a->bopq, a->mvd_bdst); |
25160 | + } | |
25161 | + | |
25162 | +out: | |
25163 | + AuTraceErr(err); | |
25164 | + return err; | |
25165 | +} | |
25166 | + | |
392086de | 25167 | +static int au_mvd_args_intermediate(const unsigned char dmsg, |
c2b27bf2 AM |
25168 | + struct au_mvd_args *a) |
25169 | +{ | |
25170 | + int err; | |
25171 | + struct au_dinfo *dinfo, *tmp; | |
25172 | + | |
25173 | + /* lookup the next lower positive entry */ | |
25174 | + err = -ENOMEM; | |
25175 | + tmp = au_di_alloc(a->sb, AuLsc_DI_TMP); | |
25176 | + if (unlikely(!tmp)) | |
25177 | + goto out; | |
25178 | + | |
25179 | + a->bfound = -1; | |
25180 | + a->bwh = -1; | |
25181 | + dinfo = au_di(a->dentry); | |
25182 | + au_di_cp(tmp, dinfo); | |
25183 | + au_di_swap(tmp, dinfo); | |
25184 | + | |
25185 | + /* returns the number of positive dentries */ | |
5afbbe0d AM |
25186 | + err = au_lkup_dentry(a->dentry, a->mvd_bsrc + 1, |
25187 | + /* AuLkup_IGNORE_PERM */ 0); | |
c2b27bf2 AM |
25188 | + if (!err) |
25189 | + a->bwh = au_dbwh(a->dentry); | |
25190 | + else if (err > 0) | |
5afbbe0d | 25191 | + a->bfound = au_dbtop(a->dentry); |
c2b27bf2 AM |
25192 | + |
25193 | + au_di_swap(tmp, dinfo); | |
25194 | + au_rw_write_unlock(&tmp->di_rwsem); | |
25195 | + au_di_free(tmp); | |
25196 | + if (unlikely(err < 0)) | |
392086de | 25197 | + AU_MVD_PR(dmsg, "failed look-up lower\n"); |
c2b27bf2 AM |
25198 | + |
25199 | + /* | |
25200 | + * here, we have these cases. | |
25201 | + * bfound == -1 | |
25202 | + * no positive dentry under bsrc. there are more sub-cases. | |
25203 | + * bwh < 0 | |
25204 | + * there no whiteout, we can safely move-down. | |
25205 | + * bwh <= bsrc | |
25206 | + * impossible | |
25207 | + * bsrc < bwh && bwh < bdst | |
25208 | + * there is a whiteout on RO branch. cannot proceed. | |
25209 | + * bwh == bdst | |
25210 | + * there is a whiteout on the RW target branch. it should | |
25211 | + * be removed. | |
25212 | + * bdst < bwh | |
25213 | + * there is a whiteout somewhere unrelated branch. | |
25214 | + * -1 < bfound && bfound <= bsrc | |
25215 | + * impossible. | |
25216 | + * bfound < bdst | |
25217 | + * found, but it is on RO branch between bsrc and bdst. cannot | |
25218 | + * proceed. | |
25219 | + * bfound == bdst | |
25220 | + * found, replace it if AUFS_MVDOWN_FORCE is set. otherwise return | |
25221 | + * error. | |
25222 | + * bdst < bfound | |
25223 | + * found, after we create the file on bdst, it will be hidden. | |
25224 | + */ | |
25225 | + | |
25226 | + AuDebugOn(a->bfound == -1 | |
25227 | + && a->bwh != -1 | |
25228 | + && a->bwh <= a->mvd_bsrc); | |
25229 | + AuDebugOn(-1 < a->bfound | |
25230 | + && a->bfound <= a->mvd_bsrc); | |
25231 | + | |
25232 | + err = -EINVAL; | |
25233 | + if (a->bfound == -1 | |
25234 | + && a->mvd_bsrc < a->bwh | |
25235 | + && a->bwh != -1 | |
25236 | + && a->bwh < a->mvd_bdst) { | |
392086de AM |
25237 | + a->mvd_errno = EAU_MVDOWN_WHITEOUT; |
25238 | + AU_MVD_PR(dmsg, "bsrc %d, bdst %d, bfound %d, bwh %d\n", | |
c2b27bf2 AM |
25239 | + a->mvd_bsrc, a->mvd_bdst, a->bfound, a->bwh); |
25240 | + goto out; | |
25241 | + } else if (a->bfound != -1 && a->bfound < a->mvd_bdst) { | |
392086de AM |
25242 | + a->mvd_errno = EAU_MVDOWN_UPPER; |
25243 | + AU_MVD_PR(dmsg, "bdst %d, bfound %d\n", | |
c2b27bf2 AM |
25244 | + a->mvd_bdst, a->bfound); |
25245 | + goto out; | |
25246 | + } | |
25247 | + | |
25248 | + err = 0; /* success */ | |
25249 | + | |
25250 | +out: | |
25251 | + AuTraceErr(err); | |
25252 | + return err; | |
25253 | +} | |
25254 | + | |
392086de | 25255 | +static int au_mvd_args_exist(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25256 | +{ |
25257 | + int err; | |
25258 | + | |
392086de AM |
25259 | + err = 0; |
25260 | + if (!(a->mvdown.flags & AUFS_MVDOWN_OWLOWER) | |
25261 | + && a->bfound == a->mvd_bdst) | |
25262 | + err = -EEXIST; | |
c2b27bf2 AM |
25263 | + AuTraceErr(err); |
25264 | + return err; | |
25265 | +} | |
25266 | + | |
392086de | 25267 | +static int au_mvd_args(const unsigned char dmsg, struct au_mvd_args *a) |
c2b27bf2 AM |
25268 | +{ |
25269 | + int err; | |
25270 | + struct au_branch *br; | |
25271 | + | |
25272 | + err = -EISDIR; | |
25273 | + if (unlikely(S_ISDIR(a->inode->i_mode))) | |
25274 | + goto out; | |
25275 | + | |
25276 | + err = -EINVAL; | |
392086de | 25277 | + if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_UPPER)) |
5afbbe0d | 25278 | + a->mvd_bsrc = au_ibtop(a->inode); |
392086de AM |
25279 | + else { |
25280 | + a->mvd_bsrc = au_br_index(a->sb, a->mvd_src_brid); | |
25281 | + if (unlikely(a->mvd_bsrc < 0 | |
5afbbe0d AM |
25282 | + || (a->mvd_bsrc < au_dbtop(a->dentry) |
25283 | + || au_dbbot(a->dentry) < a->mvd_bsrc | |
392086de | 25284 | + || !au_h_dptr(a->dentry, a->mvd_bsrc)) |
5afbbe0d AM |
25285 | + || (a->mvd_bsrc < au_ibtop(a->inode) |
25286 | + || au_ibbot(a->inode) < a->mvd_bsrc | |
392086de AM |
25287 | + || !au_h_iptr(a->inode, a->mvd_bsrc)))) { |
25288 | + a->mvd_errno = EAU_MVDOWN_NOUPPER; | |
25289 | + AU_MVD_PR(dmsg, "no upper\n"); | |
25290 | + goto out; | |
25291 | + } | |
25292 | + } | |
5afbbe0d | 25293 | + if (unlikely(a->mvd_bsrc == au_sbbot(a->sb))) { |
392086de AM |
25294 | + a->mvd_errno = EAU_MVDOWN_BOTTOM; |
25295 | + AU_MVD_PR(dmsg, "on the bottom\n"); | |
c2b27bf2 AM |
25296 | + goto out; |
25297 | + } | |
392086de | 25298 | + a->mvd_h_src_inode = au_h_iptr(a->inode, a->mvd_bsrc); |
c2b27bf2 AM |
25299 | + br = au_sbr(a->sb, a->mvd_bsrc); |
25300 | + err = au_br_rdonly(br); | |
392086de AM |
25301 | + if (!(a->mvdown.flags & AUFS_MVDOWN_ROUPPER)) { |
25302 | + if (unlikely(err)) | |
25303 | + goto out; | |
25304 | + } else if (!(vfsub_native_ro(a->mvd_h_src_inode) | |
25305 | + || IS_APPEND(a->mvd_h_src_inode))) { | |
25306 | + if (err) | |
25307 | + a->mvdown.flags |= AUFS_MVDOWN_ROUPPER_R; | |
25308 | + /* go on */ | |
25309 | + } else | |
c2b27bf2 AM |
25310 | + goto out; |
25311 | + | |
25312 | + err = -EINVAL; | |
392086de AM |
25313 | + if (!(a->mvdown.flags & AUFS_MVDOWN_BRID_LOWER)) { |
25314 | + a->mvd_bdst = find_lower_writable(a); | |
25315 | + if (unlikely(a->mvd_bdst < 0)) { | |
25316 | + a->mvd_errno = EAU_MVDOWN_BOTTOM; | |
25317 | + AU_MVD_PR(dmsg, "no writable lower branch\n"); | |
25318 | + goto out; | |
25319 | + } | |
25320 | + } else { | |
25321 | + a->mvd_bdst = au_br_index(a->sb, a->mvd_dst_brid); | |
25322 | + if (unlikely(a->mvd_bdst < 0 | |
5afbbe0d | 25323 | + || au_sbbot(a->sb) < a->mvd_bdst)) { |
392086de AM |
25324 | + a->mvd_errno = EAU_MVDOWN_NOLOWERBR; |
25325 | + AU_MVD_PR(dmsg, "no lower brid\n"); | |
25326 | + goto out; | |
25327 | + } | |
c2b27bf2 AM |
25328 | + } |
25329 | + | |
392086de | 25330 | + err = au_mvd_args_busy(dmsg, a); |
c2b27bf2 | 25331 | + if (!err) |
392086de | 25332 | + err = au_mvd_args_parent(dmsg, a); |
c2b27bf2 | 25333 | + if (!err) |
392086de | 25334 | + err = au_mvd_args_intermediate(dmsg, a); |
c2b27bf2 | 25335 | + if (!err) |
392086de | 25336 | + err = au_mvd_args_exist(dmsg, a); |
c2b27bf2 AM |
25337 | + if (!err) |
25338 | + AuDbg("b%d, b%d\n", a->mvd_bsrc, a->mvd_bdst); | |
25339 | + | |
25340 | +out: | |
25341 | + AuTraceErr(err); | |
25342 | + return err; | |
25343 | +} | |
25344 | + | |
25345 | +int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *uarg) | |
25346 | +{ | |
392086de AM |
25347 | + int err, e; |
25348 | + unsigned char dmsg; | |
25349 | + struct au_mvd_args *args; | |
79b8bda9 | 25350 | + struct inode *inode; |
c2b27bf2 | 25351 | + |
79b8bda9 | 25352 | + inode = d_inode(dentry); |
c2b27bf2 AM |
25353 | + err = -EPERM; |
25354 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
25355 | + goto out; | |
25356 | + | |
392086de AM |
25357 | + err = -ENOMEM; |
25358 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
25359 | + if (unlikely(!args)) | |
25360 | + goto out; | |
25361 | + | |
25362 | + err = copy_from_user(&args->mvdown, uarg, sizeof(args->mvdown)); | |
25363 | + if (!err) | |
25364 | + err = !access_ok(VERIFY_WRITE, uarg, sizeof(*uarg)); | |
c2b27bf2 AM |
25365 | + if (unlikely(err)) { |
25366 | + err = -EFAULT; | |
392086de AM |
25367 | + AuTraceErr(err); |
25368 | + goto out_free; | |
c2b27bf2 | 25369 | + } |
392086de AM |
25370 | + AuDbg("flags 0x%x\n", args->mvdown.flags); |
25371 | + args->mvdown.flags &= ~(AUFS_MVDOWN_ROLOWER_R | AUFS_MVDOWN_ROUPPER_R); | |
25372 | + args->mvdown.au_errno = 0; | |
25373 | + args->dentry = dentry; | |
79b8bda9 | 25374 | + args->inode = inode; |
392086de | 25375 | + args->sb = dentry->d_sb; |
c2b27bf2 | 25376 | + |
392086de AM |
25377 | + err = -ENOENT; |
25378 | + dmsg = !!(args->mvdown.flags & AUFS_MVDOWN_DMSG); | |
25379 | + args->parent = dget_parent(dentry); | |
5527c038 | 25380 | + args->dir = d_inode(args->parent); |
febd17d6 | 25381 | + inode_lock_nested(args->dir, I_MUTEX_PARENT); |
392086de AM |
25382 | + dput(args->parent); |
25383 | + if (unlikely(args->parent != dentry->d_parent)) { | |
25384 | + AU_MVD_PR(dmsg, "parent dir is moved\n"); | |
c2b27bf2 AM |
25385 | + goto out_dir; |
25386 | + } | |
25387 | + | |
febd17d6 | 25388 | + inode_lock_nested(inode, I_MUTEX_CHILD); |
b95c5147 | 25389 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_NOPLMW); |
c2b27bf2 AM |
25390 | + if (unlikely(err)) |
25391 | + goto out_inode; | |
25392 | + | |
392086de AM |
25393 | + di_write_lock_parent(args->parent); |
25394 | + err = au_mvd_args(dmsg, args); | |
c2b27bf2 AM |
25395 | + if (unlikely(err)) |
25396 | + goto out_parent; | |
25397 | + | |
392086de | 25398 | + err = au_do_mvdown(dmsg, args); |
c2b27bf2 AM |
25399 | + if (unlikely(err)) |
25400 | + goto out_parent; | |
c2b27bf2 | 25401 | + |
392086de | 25402 | + au_cpup_attr_timesizes(args->dir); |
79b8bda9 AM |
25403 | + au_cpup_attr_timesizes(inode); |
25404 | + if (!(args->mvdown.flags & AUFS_MVDOWN_KUPPER)) | |
25405 | + au_cpup_igen(inode, au_h_iptr(inode, args->mvd_bdst)); | |
c2b27bf2 AM |
25406 | + /* au_digen_dec(dentry); */ |
25407 | + | |
25408 | +out_parent: | |
392086de | 25409 | + di_write_unlock(args->parent); |
c2b27bf2 AM |
25410 | + aufs_read_unlock(dentry, AuLock_DW); |
25411 | +out_inode: | |
febd17d6 | 25412 | + inode_unlock(inode); |
c2b27bf2 | 25413 | +out_dir: |
febd17d6 | 25414 | + inode_unlock(args->dir); |
392086de AM |
25415 | +out_free: |
25416 | + e = copy_to_user(uarg, &args->mvdown, sizeof(args->mvdown)); | |
25417 | + if (unlikely(e)) | |
25418 | + err = -EFAULT; | |
1c60b727 | 25419 | + kfree(args); |
c2b27bf2 AM |
25420 | +out: |
25421 | + AuTraceErr(err); | |
25422 | + return err; | |
25423 | +} | |
25424 | diff -urN /usr/share/empty/fs/aufs/opts.c linux/fs/aufs/opts.c | |
25425 | --- /usr/share/empty/fs/aufs/opts.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 25426 | +++ linux/fs/aufs/opts.c 2018-08-12 23:43:05.460124736 +0200 |
8b6a4947 | 25427 | @@ -0,0 +1,1891 @@ |
cd7a4cd9 | 25428 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 25429 | +/* |
b00004a5 | 25430 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 25431 | + * |
25432 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25433 | + * it under the terms of the GNU General Public License as published by | |
25434 | + * the Free Software Foundation; either version 2 of the License, or | |
25435 | + * (at your option) any later version. | |
dece6358 AM |
25436 | + * |
25437 | + * This program is distributed in the hope that it will be useful, | |
25438 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25439 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25440 | + * GNU General Public License for more details. | |
25441 | + * | |
25442 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 25443 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 25444 | + */ |
25445 | + | |
25446 | +/* | |
25447 | + * mount options/flags | |
25448 | + */ | |
25449 | + | |
dece6358 | 25450 | +#include <linux/namei.h> |
1facf9fc | 25451 | +#include <linux/types.h> /* a distribution requires */ |
25452 | +#include <linux/parser.h> | |
25453 | +#include "aufs.h" | |
25454 | + | |
25455 | +/* ---------------------------------------------------------------------- */ | |
25456 | + | |
25457 | +enum { | |
25458 | + Opt_br, | |
7e9cd9fe AM |
25459 | + Opt_add, Opt_del, Opt_mod, Opt_append, Opt_prepend, |
25460 | + Opt_idel, Opt_imod, | |
25461 | + Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, | |
dece6358 | 25462 | + Opt_rdblk_def, Opt_rdhash_def, |
7e9cd9fe | 25463 | + Opt_xino, Opt_noxino, |
1facf9fc | 25464 | + Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino, |
25465 | + Opt_trunc_xino_path, Opt_itrunc_xino, | |
25466 | + Opt_trunc_xib, Opt_notrunc_xib, | |
dece6358 | 25467 | + Opt_shwh, Opt_noshwh, |
1facf9fc | 25468 | + Opt_plink, Opt_noplink, Opt_list_plink, |
25469 | + Opt_udba, | |
4a4d8108 | 25470 | + Opt_dio, Opt_nodio, |
1facf9fc | 25471 | + Opt_diropq_a, Opt_diropq_w, |
25472 | + Opt_warn_perm, Opt_nowarn_perm, | |
25473 | + Opt_wbr_copyup, Opt_wbr_create, | |
076b876e | 25474 | + Opt_fhsm_sec, |
1facf9fc | 25475 | + Opt_verbose, Opt_noverbose, |
25476 | + Opt_sum, Opt_nosum, Opt_wsum, | |
076b876e | 25477 | + Opt_dirperm1, Opt_nodirperm1, |
8b6a4947 | 25478 | + Opt_dirren, Opt_nodirren, |
c1595e42 | 25479 | + Opt_acl, Opt_noacl, |
1facf9fc | 25480 | + Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err |
25481 | +}; | |
25482 | + | |
25483 | +static match_table_t options = { | |
25484 | + {Opt_br, "br=%s"}, | |
25485 | + {Opt_br, "br:%s"}, | |
25486 | + | |
25487 | + {Opt_add, "add=%d:%s"}, | |
25488 | + {Opt_add, "add:%d:%s"}, | |
25489 | + {Opt_add, "ins=%d:%s"}, | |
25490 | + {Opt_add, "ins:%d:%s"}, | |
25491 | + {Opt_append, "append=%s"}, | |
25492 | + {Opt_append, "append:%s"}, | |
25493 | + {Opt_prepend, "prepend=%s"}, | |
25494 | + {Opt_prepend, "prepend:%s"}, | |
25495 | + | |
25496 | + {Opt_del, "del=%s"}, | |
25497 | + {Opt_del, "del:%s"}, | |
25498 | + /* {Opt_idel, "idel:%d"}, */ | |
25499 | + {Opt_mod, "mod=%s"}, | |
25500 | + {Opt_mod, "mod:%s"}, | |
25501 | + /* {Opt_imod, "imod:%d:%s"}, */ | |
25502 | + | |
25503 | + {Opt_dirwh, "dirwh=%d"}, | |
25504 | + | |
25505 | + {Opt_xino, "xino=%s"}, | |
25506 | + {Opt_noxino, "noxino"}, | |
25507 | + {Opt_trunc_xino, "trunc_xino"}, | |
25508 | + {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"}, | |
25509 | + {Opt_notrunc_xino, "notrunc_xino"}, | |
25510 | + {Opt_trunc_xino_path, "trunc_xino=%s"}, | |
25511 | + {Opt_itrunc_xino, "itrunc_xino=%d"}, | |
25512 | + /* {Opt_zxino, "zxino=%s"}, */ | |
25513 | + {Opt_trunc_xib, "trunc_xib"}, | |
25514 | + {Opt_notrunc_xib, "notrunc_xib"}, | |
25515 | + | |
e49829fe | 25516 | +#ifdef CONFIG_PROC_FS |
1facf9fc | 25517 | + {Opt_plink, "plink"}, |
e49829fe JR |
25518 | +#else |
25519 | + {Opt_ignore_silent, "plink"}, | |
25520 | +#endif | |
25521 | + | |
1facf9fc | 25522 | + {Opt_noplink, "noplink"}, |
e49829fe | 25523 | + |
1facf9fc | 25524 | +#ifdef CONFIG_AUFS_DEBUG |
25525 | + {Opt_list_plink, "list_plink"}, | |
25526 | +#endif | |
25527 | + | |
25528 | + {Opt_udba, "udba=%s"}, | |
25529 | + | |
4a4d8108 AM |
25530 | + {Opt_dio, "dio"}, |
25531 | + {Opt_nodio, "nodio"}, | |
25532 | + | |
8b6a4947 AM |
25533 | +#ifdef CONFIG_AUFS_DIRREN |
25534 | + {Opt_dirren, "dirren"}, | |
25535 | + {Opt_nodirren, "nodirren"}, | |
25536 | +#else | |
25537 | + {Opt_ignore, "dirren"}, | |
25538 | + {Opt_ignore_silent, "nodirren"}, | |
25539 | +#endif | |
25540 | + | |
076b876e AM |
25541 | +#ifdef CONFIG_AUFS_FHSM |
25542 | + {Opt_fhsm_sec, "fhsm_sec=%d"}, | |
25543 | +#else | |
8b6a4947 | 25544 | + {Opt_ignore, "fhsm_sec=%d"}, |
076b876e AM |
25545 | +#endif |
25546 | + | |
1facf9fc | 25547 | + {Opt_diropq_a, "diropq=always"}, |
25548 | + {Opt_diropq_a, "diropq=a"}, | |
25549 | + {Opt_diropq_w, "diropq=whiteouted"}, | |
25550 | + {Opt_diropq_w, "diropq=w"}, | |
25551 | + | |
25552 | + {Opt_warn_perm, "warn_perm"}, | |
25553 | + {Opt_nowarn_perm, "nowarn_perm"}, | |
25554 | + | |
25555 | + /* keep them temporary */ | |
1facf9fc | 25556 | + {Opt_ignore_silent, "nodlgt"}, |
8b6a4947 | 25557 | + {Opt_ignore, "clean_plink"}, |
1facf9fc | 25558 | + |
dece6358 AM |
25559 | +#ifdef CONFIG_AUFS_SHWH |
25560 | + {Opt_shwh, "shwh"}, | |
25561 | +#endif | |
25562 | + {Opt_noshwh, "noshwh"}, | |
25563 | + | |
076b876e AM |
25564 | + {Opt_dirperm1, "dirperm1"}, |
25565 | + {Opt_nodirperm1, "nodirperm1"}, | |
25566 | + | |
1facf9fc | 25567 | + {Opt_verbose, "verbose"}, |
25568 | + {Opt_verbose, "v"}, | |
25569 | + {Opt_noverbose, "noverbose"}, | |
25570 | + {Opt_noverbose, "quiet"}, | |
25571 | + {Opt_noverbose, "q"}, | |
25572 | + {Opt_noverbose, "silent"}, | |
25573 | + | |
25574 | + {Opt_sum, "sum"}, | |
25575 | + {Opt_nosum, "nosum"}, | |
25576 | + {Opt_wsum, "wsum"}, | |
25577 | + | |
25578 | + {Opt_rdcache, "rdcache=%d"}, | |
25579 | + {Opt_rdblk, "rdblk=%d"}, | |
dece6358 | 25580 | + {Opt_rdblk_def, "rdblk=def"}, |
1facf9fc | 25581 | + {Opt_rdhash, "rdhash=%d"}, |
dece6358 | 25582 | + {Opt_rdhash_def, "rdhash=def"}, |
1facf9fc | 25583 | + |
25584 | + {Opt_wbr_create, "create=%s"}, | |
25585 | + {Opt_wbr_create, "create_policy=%s"}, | |
25586 | + {Opt_wbr_copyup, "cpup=%s"}, | |
25587 | + {Opt_wbr_copyup, "copyup=%s"}, | |
25588 | + {Opt_wbr_copyup, "copyup_policy=%s"}, | |
25589 | + | |
c1595e42 JR |
25590 | + /* generic VFS flag */ |
25591 | +#ifdef CONFIG_FS_POSIX_ACL | |
25592 | + {Opt_acl, "acl"}, | |
25593 | + {Opt_noacl, "noacl"}, | |
25594 | +#else | |
8b6a4947 | 25595 | + {Opt_ignore, "acl"}, |
c1595e42 JR |
25596 | + {Opt_ignore_silent, "noacl"}, |
25597 | +#endif | |
25598 | + | |
1facf9fc | 25599 | + /* internal use for the scripts */ |
25600 | + {Opt_ignore_silent, "si=%s"}, | |
25601 | + | |
25602 | + {Opt_br, "dirs=%s"}, | |
25603 | + {Opt_ignore, "debug=%d"}, | |
25604 | + {Opt_ignore, "delete=whiteout"}, | |
25605 | + {Opt_ignore, "delete=all"}, | |
25606 | + {Opt_ignore, "imap=%s"}, | |
25607 | + | |
1308ab2a | 25608 | + /* temporary workaround, due to old mount(8)? */ |
25609 | + {Opt_ignore_silent, "relatime"}, | |
25610 | + | |
1facf9fc | 25611 | + {Opt_err, NULL} |
25612 | +}; | |
25613 | + | |
25614 | +/* ---------------------------------------------------------------------- */ | |
25615 | + | |
076b876e | 25616 | +static const char *au_parser_pattern(int val, match_table_t tbl) |
1facf9fc | 25617 | +{ |
076b876e AM |
25618 | + struct match_token *p; |
25619 | + | |
25620 | + p = tbl; | |
25621 | + while (p->pattern) { | |
25622 | + if (p->token == val) | |
25623 | + return p->pattern; | |
25624 | + p++; | |
1facf9fc | 25625 | + } |
25626 | + BUG(); | |
25627 | + return "??"; | |
25628 | +} | |
25629 | + | |
076b876e AM |
25630 | +static const char *au_optstr(int *val, match_table_t tbl) |
25631 | +{ | |
25632 | + struct match_token *p; | |
25633 | + int v; | |
25634 | + | |
25635 | + v = *val; | |
2000de60 JR |
25636 | + if (!v) |
25637 | + goto out; | |
076b876e | 25638 | + p = tbl; |
2000de60 JR |
25639 | + while (p->pattern) { |
25640 | + if (p->token | |
25641 | + && (v & p->token) == p->token) { | |
076b876e AM |
25642 | + *val &= ~p->token; |
25643 | + return p->pattern; | |
25644 | + } | |
25645 | + p++; | |
25646 | + } | |
2000de60 JR |
25647 | + |
25648 | +out: | |
076b876e AM |
25649 | + return NULL; |
25650 | +} | |
25651 | + | |
1facf9fc | 25652 | +/* ---------------------------------------------------------------------- */ |
25653 | + | |
1e00d052 | 25654 | +static match_table_t brperm = { |
1facf9fc | 25655 | + {AuBrPerm_RO, AUFS_BRPERM_RO}, |
25656 | + {AuBrPerm_RR, AUFS_BRPERM_RR}, | |
25657 | + {AuBrPerm_RW, AUFS_BRPERM_RW}, | |
1e00d052 AM |
25658 | + {0, NULL} |
25659 | +}; | |
1facf9fc | 25660 | + |
86dc4139 | 25661 | +static match_table_t brattr = { |
076b876e AM |
25662 | + /* general */ |
25663 | + {AuBrAttr_COO_REG, AUFS_BRATTR_COO_REG}, | |
25664 | + {AuBrAttr_COO_ALL, AUFS_BRATTR_COO_ALL}, | |
c1595e42 | 25665 | + /* 'unpin' attrib is meaningless since linux-3.18-rc1 */ |
86dc4139 | 25666 | + {AuBrAttr_UNPIN, AUFS_BRATTR_UNPIN}, |
2000de60 | 25667 | +#ifdef CONFIG_AUFS_FHSM |
076b876e | 25668 | + {AuBrAttr_FHSM, AUFS_BRATTR_FHSM}, |
2000de60 JR |
25669 | +#endif |
25670 | +#ifdef CONFIG_AUFS_XATTR | |
c1595e42 JR |
25671 | + {AuBrAttr_ICEX, AUFS_BRATTR_ICEX}, |
25672 | + {AuBrAttr_ICEX_SEC, AUFS_BRATTR_ICEX_SEC}, | |
25673 | + {AuBrAttr_ICEX_SYS, AUFS_BRATTR_ICEX_SYS}, | |
25674 | + {AuBrAttr_ICEX_TR, AUFS_BRATTR_ICEX_TR}, | |
25675 | + {AuBrAttr_ICEX_USR, AUFS_BRATTR_ICEX_USR}, | |
25676 | + {AuBrAttr_ICEX_OTH, AUFS_BRATTR_ICEX_OTH}, | |
2000de60 | 25677 | +#endif |
076b876e AM |
25678 | + |
25679 | + /* ro/rr branch */ | |
1e00d052 | 25680 | + {AuBrRAttr_WH, AUFS_BRRATTR_WH}, |
076b876e AM |
25681 | + |
25682 | + /* rw branch */ | |
25683 | + {AuBrWAttr_MOO, AUFS_BRWATTR_MOO}, | |
1e00d052 | 25684 | + {AuBrWAttr_NoLinkWH, AUFS_BRWATTR_NLWH}, |
076b876e | 25685 | + |
1e00d052 | 25686 | + {0, NULL} |
1facf9fc | 25687 | +}; |
25688 | + | |
1e00d052 AM |
25689 | +static int br_attr_val(char *str, match_table_t table, substring_t args[]) |
25690 | +{ | |
25691 | + int attr, v; | |
25692 | + char *p; | |
25693 | + | |
25694 | + attr = 0; | |
25695 | + do { | |
25696 | + p = strchr(str, '+'); | |
25697 | + if (p) | |
25698 | + *p = 0; | |
25699 | + v = match_token(str, table, args); | |
076b876e AM |
25700 | + if (v) { |
25701 | + if (v & AuBrAttr_CMOO_Mask) | |
25702 | + attr &= ~AuBrAttr_CMOO_Mask; | |
1e00d052 | 25703 | + attr |= v; |
076b876e | 25704 | + } else { |
1e00d052 AM |
25705 | + if (p) |
25706 | + *p = '+'; | |
0c3ec466 | 25707 | + pr_warn("ignored branch attribute %s\n", str); |
1e00d052 AM |
25708 | + break; |
25709 | + } | |
25710 | + if (p) | |
25711 | + str = p + 1; | |
25712 | + } while (p); | |
25713 | + | |
25714 | + return attr; | |
25715 | +} | |
25716 | + | |
076b876e AM |
25717 | +static int au_do_optstr_br_attr(au_br_perm_str_t *str, int perm) |
25718 | +{ | |
25719 | + int sz; | |
25720 | + const char *p; | |
25721 | + char *q; | |
25722 | + | |
076b876e AM |
25723 | + q = str->a; |
25724 | + *q = 0; | |
25725 | + p = au_optstr(&perm, brattr); | |
25726 | + if (p) { | |
25727 | + sz = strlen(p); | |
25728 | + memcpy(q, p, sz + 1); | |
25729 | + q += sz; | |
25730 | + } else | |
25731 | + goto out; | |
25732 | + | |
25733 | + do { | |
25734 | + p = au_optstr(&perm, brattr); | |
25735 | + if (p) { | |
25736 | + *q++ = '+'; | |
25737 | + sz = strlen(p); | |
25738 | + memcpy(q, p, sz + 1); | |
25739 | + q += sz; | |
25740 | + } | |
25741 | + } while (p); | |
25742 | + | |
25743 | +out: | |
c1595e42 | 25744 | + return q - str->a; |
076b876e AM |
25745 | +} |
25746 | + | |
4a4d8108 | 25747 | +static int noinline_for_stack br_perm_val(char *perm) |
1facf9fc | 25748 | +{ |
076b876e AM |
25749 | + int val, bad, sz; |
25750 | + char *p; | |
1facf9fc | 25751 | + substring_t args[MAX_OPT_ARGS]; |
076b876e | 25752 | + au_br_perm_str_t attr; |
1facf9fc | 25753 | + |
1e00d052 AM |
25754 | + p = strchr(perm, '+'); |
25755 | + if (p) | |
25756 | + *p = 0; | |
25757 | + val = match_token(perm, brperm, args); | |
25758 | + if (!val) { | |
25759 | + if (p) | |
25760 | + *p = '+'; | |
0c3ec466 | 25761 | + pr_warn("ignored branch permission %s\n", perm); |
1e00d052 AM |
25762 | + val = AuBrPerm_RO; |
25763 | + goto out; | |
25764 | + } | |
25765 | + if (!p) | |
25766 | + goto out; | |
25767 | + | |
076b876e AM |
25768 | + val |= br_attr_val(p + 1, brattr, args); |
25769 | + | |
25770 | + bad = 0; | |
86dc4139 | 25771 | + switch (val & AuBrPerm_Mask) { |
1e00d052 AM |
25772 | + case AuBrPerm_RO: |
25773 | + case AuBrPerm_RR: | |
076b876e AM |
25774 | + bad = val & AuBrWAttr_Mask; |
25775 | + val &= ~AuBrWAttr_Mask; | |
1e00d052 AM |
25776 | + break; |
25777 | + case AuBrPerm_RW: | |
076b876e AM |
25778 | + bad = val & AuBrRAttr_Mask; |
25779 | + val &= ~AuBrRAttr_Mask; | |
1e00d052 AM |
25780 | + break; |
25781 | + } | |
c1595e42 JR |
25782 | + |
25783 | + /* | |
25784 | + * 'unpin' attrib becomes meaningless since linux-3.18-rc1, but aufs | |
25785 | + * does not treat it as an error, just warning. | |
25786 | + * this is a tiny guard for the user operation. | |
25787 | + */ | |
25788 | + if (val & AuBrAttr_UNPIN) { | |
25789 | + bad |= AuBrAttr_UNPIN; | |
25790 | + val &= ~AuBrAttr_UNPIN; | |
25791 | + } | |
25792 | + | |
076b876e AM |
25793 | + if (unlikely(bad)) { |
25794 | + sz = au_do_optstr_br_attr(&attr, bad); | |
25795 | + AuDebugOn(!sz); | |
25796 | + pr_warn("ignored branch attribute %s\n", attr.a); | |
25797 | + } | |
1e00d052 AM |
25798 | + |
25799 | +out: | |
1facf9fc | 25800 | + return val; |
25801 | +} | |
25802 | + | |
076b876e | 25803 | +void au_optstr_br_perm(au_br_perm_str_t *str, int perm) |
1facf9fc | 25804 | +{ |
076b876e AM |
25805 | + au_br_perm_str_t attr; |
25806 | + const char *p; | |
25807 | + char *q; | |
1e00d052 AM |
25808 | + int sz; |
25809 | + | |
076b876e AM |
25810 | + q = str->a; |
25811 | + p = au_optstr(&perm, brperm); | |
25812 | + AuDebugOn(!p || !*p); | |
25813 | + sz = strlen(p); | |
25814 | + memcpy(q, p, sz + 1); | |
25815 | + q += sz; | |
1e00d052 | 25816 | + |
076b876e AM |
25817 | + sz = au_do_optstr_br_attr(&attr, perm); |
25818 | + if (sz) { | |
25819 | + *q++ = '+'; | |
25820 | + memcpy(q, attr.a, sz + 1); | |
1e00d052 AM |
25821 | + } |
25822 | + | |
076b876e | 25823 | + AuDebugOn(strlen(str->a) >= sizeof(str->a)); |
1facf9fc | 25824 | +} |
25825 | + | |
25826 | +/* ---------------------------------------------------------------------- */ | |
25827 | + | |
25828 | +static match_table_t udbalevel = { | |
25829 | + {AuOpt_UDBA_REVAL, "reval"}, | |
25830 | + {AuOpt_UDBA_NONE, "none"}, | |
4a4d8108 AM |
25831 | +#ifdef CONFIG_AUFS_HNOTIFY |
25832 | + {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */ | |
25833 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
25834 | + {AuOpt_UDBA_HNOTIFY, "fsnotify"}, | |
4a4d8108 | 25835 | +#endif |
1facf9fc | 25836 | +#endif |
25837 | + {-1, NULL} | |
25838 | +}; | |
25839 | + | |
4a4d8108 | 25840 | +static int noinline_for_stack udba_val(char *str) |
1facf9fc | 25841 | +{ |
25842 | + substring_t args[MAX_OPT_ARGS]; | |
25843 | + | |
7f207e10 | 25844 | + return match_token(str, udbalevel, args); |
1facf9fc | 25845 | +} |
25846 | + | |
25847 | +const char *au_optstr_udba(int udba) | |
25848 | +{ | |
076b876e | 25849 | + return au_parser_pattern(udba, udbalevel); |
1facf9fc | 25850 | +} |
25851 | + | |
25852 | +/* ---------------------------------------------------------------------- */ | |
25853 | + | |
25854 | +static match_table_t au_wbr_create_policy = { | |
25855 | + {AuWbrCreate_TDP, "tdp"}, | |
25856 | + {AuWbrCreate_TDP, "top-down-parent"}, | |
25857 | + {AuWbrCreate_RR, "rr"}, | |
25858 | + {AuWbrCreate_RR, "round-robin"}, | |
25859 | + {AuWbrCreate_MFS, "mfs"}, | |
25860 | + {AuWbrCreate_MFS, "most-free-space"}, | |
25861 | + {AuWbrCreate_MFSV, "mfs:%d"}, | |
25862 | + {AuWbrCreate_MFSV, "most-free-space:%d"}, | |
25863 | + | |
f2c43d5f AM |
25864 | + /* top-down regardless the parent, and then mfs */ |
25865 | + {AuWbrCreate_TDMFS, "tdmfs:%d"}, | |
25866 | + {AuWbrCreate_TDMFSV, "tdmfs:%d:%d"}, | |
25867 | + | |
1facf9fc | 25868 | + {AuWbrCreate_MFSRR, "mfsrr:%d"}, |
25869 | + {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"}, | |
25870 | + {AuWbrCreate_PMFS, "pmfs"}, | |
25871 | + {AuWbrCreate_PMFSV, "pmfs:%d"}, | |
392086de AM |
25872 | + {AuWbrCreate_PMFSRR, "pmfsrr:%d"}, |
25873 | + {AuWbrCreate_PMFSRRV, "pmfsrr:%d:%d"}, | |
1facf9fc | 25874 | + |
25875 | + {-1, NULL} | |
25876 | +}; | |
25877 | + | |
1facf9fc | 25878 | +static int au_wbr_mfs_wmark(substring_t *arg, char *str, |
25879 | + struct au_opt_wbr_create *create) | |
25880 | +{ | |
25881 | + int err; | |
25882 | + unsigned long long ull; | |
25883 | + | |
25884 | + err = 0; | |
a2654f78 | 25885 | + if (!match_u64(arg, &ull)) |
1facf9fc | 25886 | + create->mfsrr_watermark = ull; |
25887 | + else { | |
4a4d8108 | 25888 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 25889 | + err = -EINVAL; |
25890 | + } | |
25891 | + | |
25892 | + return err; | |
25893 | +} | |
25894 | + | |
25895 | +static int au_wbr_mfs_sec(substring_t *arg, char *str, | |
25896 | + struct au_opt_wbr_create *create) | |
25897 | +{ | |
25898 | + int n, err; | |
25899 | + | |
25900 | + err = 0; | |
027c5e7a | 25901 | + if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC) |
1facf9fc | 25902 | + create->mfs_second = n; |
25903 | + else { | |
4a4d8108 | 25904 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 25905 | + err = -EINVAL; |
25906 | + } | |
25907 | + | |
25908 | + return err; | |
25909 | +} | |
25910 | + | |
4a4d8108 AM |
25911 | +static int noinline_for_stack |
25912 | +au_wbr_create_val(char *str, struct au_opt_wbr_create *create) | |
1facf9fc | 25913 | +{ |
25914 | + int err, e; | |
25915 | + substring_t args[MAX_OPT_ARGS]; | |
25916 | + | |
25917 | + err = match_token(str, au_wbr_create_policy, args); | |
25918 | + create->wbr_create = err; | |
25919 | + switch (err) { | |
25920 | + case AuWbrCreate_MFSRRV: | |
f2c43d5f | 25921 | + case AuWbrCreate_TDMFSV: |
392086de | 25922 | + case AuWbrCreate_PMFSRRV: |
1facf9fc | 25923 | + e = au_wbr_mfs_wmark(&args[0], str, create); |
25924 | + if (!e) | |
25925 | + e = au_wbr_mfs_sec(&args[1], str, create); | |
25926 | + if (unlikely(e)) | |
25927 | + err = e; | |
25928 | + break; | |
25929 | + case AuWbrCreate_MFSRR: | |
f2c43d5f | 25930 | + case AuWbrCreate_TDMFS: |
392086de | 25931 | + case AuWbrCreate_PMFSRR: |
1facf9fc | 25932 | + e = au_wbr_mfs_wmark(&args[0], str, create); |
25933 | + if (unlikely(e)) { | |
25934 | + err = e; | |
25935 | + break; | |
25936 | + } | |
25937 | + /*FALLTHROUGH*/ | |
25938 | + case AuWbrCreate_MFS: | |
25939 | + case AuWbrCreate_PMFS: | |
027c5e7a | 25940 | + create->mfs_second = AUFS_MFS_DEF_SEC; |
1facf9fc | 25941 | + break; |
25942 | + case AuWbrCreate_MFSV: | |
25943 | + case AuWbrCreate_PMFSV: | |
25944 | + e = au_wbr_mfs_sec(&args[0], str, create); | |
25945 | + if (unlikely(e)) | |
25946 | + err = e; | |
25947 | + break; | |
25948 | + } | |
25949 | + | |
25950 | + return err; | |
25951 | +} | |
25952 | + | |
25953 | +const char *au_optstr_wbr_create(int wbr_create) | |
25954 | +{ | |
076b876e | 25955 | + return au_parser_pattern(wbr_create, au_wbr_create_policy); |
1facf9fc | 25956 | +} |
25957 | + | |
25958 | +static match_table_t au_wbr_copyup_policy = { | |
25959 | + {AuWbrCopyup_TDP, "tdp"}, | |
25960 | + {AuWbrCopyup_TDP, "top-down-parent"}, | |
25961 | + {AuWbrCopyup_BUP, "bup"}, | |
25962 | + {AuWbrCopyup_BUP, "bottom-up-parent"}, | |
25963 | + {AuWbrCopyup_BU, "bu"}, | |
25964 | + {AuWbrCopyup_BU, "bottom-up"}, | |
25965 | + {-1, NULL} | |
25966 | +}; | |
25967 | + | |
4a4d8108 | 25968 | +static int noinline_for_stack au_wbr_copyup_val(char *str) |
1facf9fc | 25969 | +{ |
25970 | + substring_t args[MAX_OPT_ARGS]; | |
25971 | + | |
25972 | + return match_token(str, au_wbr_copyup_policy, args); | |
25973 | +} | |
25974 | + | |
25975 | +const char *au_optstr_wbr_copyup(int wbr_copyup) | |
25976 | +{ | |
076b876e | 25977 | + return au_parser_pattern(wbr_copyup, au_wbr_copyup_policy); |
1facf9fc | 25978 | +} |
25979 | + | |
25980 | +/* ---------------------------------------------------------------------- */ | |
25981 | + | |
25982 | +static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; | |
25983 | + | |
25984 | +static void dump_opts(struct au_opts *opts) | |
25985 | +{ | |
25986 | +#ifdef CONFIG_AUFS_DEBUG | |
25987 | + /* reduce stack space */ | |
25988 | + union { | |
25989 | + struct au_opt_add *add; | |
25990 | + struct au_opt_del *del; | |
25991 | + struct au_opt_mod *mod; | |
25992 | + struct au_opt_xino *xino; | |
25993 | + struct au_opt_xino_itrunc *xino_itrunc; | |
25994 | + struct au_opt_wbr_create *create; | |
25995 | + } u; | |
25996 | + struct au_opt *opt; | |
25997 | + | |
25998 | + opt = opts->opt; | |
25999 | + while (opt->type != Opt_tail) { | |
26000 | + switch (opt->type) { | |
26001 | + case Opt_add: | |
26002 | + u.add = &opt->add; | |
26003 | + AuDbg("add {b%d, %s, 0x%x, %p}\n", | |
26004 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26005 | + u.add->path.dentry); | |
26006 | + break; | |
26007 | + case Opt_del: | |
26008 | + case Opt_idel: | |
26009 | + u.del = &opt->del; | |
26010 | + AuDbg("del {%s, %p}\n", | |
26011 | + u.del->pathname, u.del->h_path.dentry); | |
26012 | + break; | |
26013 | + case Opt_mod: | |
26014 | + case Opt_imod: | |
26015 | + u.mod = &opt->mod; | |
26016 | + AuDbg("mod {%s, 0x%x, %p}\n", | |
26017 | + u.mod->path, u.mod->perm, u.mod->h_root); | |
26018 | + break; | |
26019 | + case Opt_append: | |
26020 | + u.add = &opt->add; | |
26021 | + AuDbg("append {b%d, %s, 0x%x, %p}\n", | |
26022 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26023 | + u.add->path.dentry); | |
26024 | + break; | |
26025 | + case Opt_prepend: | |
26026 | + u.add = &opt->add; | |
26027 | + AuDbg("prepend {b%d, %s, 0x%x, %p}\n", | |
26028 | + u.add->bindex, u.add->pathname, u.add->perm, | |
26029 | + u.add->path.dentry); | |
26030 | + break; | |
26031 | + case Opt_dirwh: | |
26032 | + AuDbg("dirwh %d\n", opt->dirwh); | |
26033 | + break; | |
26034 | + case Opt_rdcache: | |
26035 | + AuDbg("rdcache %d\n", opt->rdcache); | |
26036 | + break; | |
26037 | + case Opt_rdblk: | |
26038 | + AuDbg("rdblk %u\n", opt->rdblk); | |
26039 | + break; | |
dece6358 AM |
26040 | + case Opt_rdblk_def: |
26041 | + AuDbg("rdblk_def\n"); | |
26042 | + break; | |
1facf9fc | 26043 | + case Opt_rdhash: |
26044 | + AuDbg("rdhash %u\n", opt->rdhash); | |
26045 | + break; | |
dece6358 AM |
26046 | + case Opt_rdhash_def: |
26047 | + AuDbg("rdhash_def\n"); | |
26048 | + break; | |
1facf9fc | 26049 | + case Opt_xino: |
26050 | + u.xino = &opt->xino; | |
523b37e3 | 26051 | + AuDbg("xino {%s %pD}\n", u.xino->path, u.xino->file); |
1facf9fc | 26052 | + break; |
26053 | + case Opt_trunc_xino: | |
26054 | + AuLabel(trunc_xino); | |
26055 | + break; | |
26056 | + case Opt_notrunc_xino: | |
26057 | + AuLabel(notrunc_xino); | |
26058 | + break; | |
26059 | + case Opt_trunc_xino_path: | |
26060 | + case Opt_itrunc_xino: | |
26061 | + u.xino_itrunc = &opt->xino_itrunc; | |
26062 | + AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex); | |
26063 | + break; | |
1facf9fc | 26064 | + case Opt_noxino: |
26065 | + AuLabel(noxino); | |
26066 | + break; | |
26067 | + case Opt_trunc_xib: | |
26068 | + AuLabel(trunc_xib); | |
26069 | + break; | |
26070 | + case Opt_notrunc_xib: | |
26071 | + AuLabel(notrunc_xib); | |
26072 | + break; | |
dece6358 AM |
26073 | + case Opt_shwh: |
26074 | + AuLabel(shwh); | |
26075 | + break; | |
26076 | + case Opt_noshwh: | |
26077 | + AuLabel(noshwh); | |
26078 | + break; | |
076b876e AM |
26079 | + case Opt_dirperm1: |
26080 | + AuLabel(dirperm1); | |
26081 | + break; | |
26082 | + case Opt_nodirperm1: | |
26083 | + AuLabel(nodirperm1); | |
26084 | + break; | |
1facf9fc | 26085 | + case Opt_plink: |
26086 | + AuLabel(plink); | |
26087 | + break; | |
26088 | + case Opt_noplink: | |
26089 | + AuLabel(noplink); | |
26090 | + break; | |
26091 | + case Opt_list_plink: | |
26092 | + AuLabel(list_plink); | |
26093 | + break; | |
26094 | + case Opt_udba: | |
26095 | + AuDbg("udba %d, %s\n", | |
26096 | + opt->udba, au_optstr_udba(opt->udba)); | |
26097 | + break; | |
4a4d8108 AM |
26098 | + case Opt_dio: |
26099 | + AuLabel(dio); | |
26100 | + break; | |
26101 | + case Opt_nodio: | |
26102 | + AuLabel(nodio); | |
26103 | + break; | |
1facf9fc | 26104 | + case Opt_diropq_a: |
26105 | + AuLabel(diropq_a); | |
26106 | + break; | |
26107 | + case Opt_diropq_w: | |
26108 | + AuLabel(diropq_w); | |
26109 | + break; | |
26110 | + case Opt_warn_perm: | |
26111 | + AuLabel(warn_perm); | |
26112 | + break; | |
26113 | + case Opt_nowarn_perm: | |
26114 | + AuLabel(nowarn_perm); | |
26115 | + break; | |
1facf9fc | 26116 | + case Opt_verbose: |
26117 | + AuLabel(verbose); | |
26118 | + break; | |
26119 | + case Opt_noverbose: | |
26120 | + AuLabel(noverbose); | |
26121 | + break; | |
26122 | + case Opt_sum: | |
26123 | + AuLabel(sum); | |
26124 | + break; | |
26125 | + case Opt_nosum: | |
26126 | + AuLabel(nosum); | |
26127 | + break; | |
26128 | + case Opt_wsum: | |
26129 | + AuLabel(wsum); | |
26130 | + break; | |
26131 | + case Opt_wbr_create: | |
26132 | + u.create = &opt->wbr_create; | |
26133 | + AuDbg("create %d, %s\n", u.create->wbr_create, | |
26134 | + au_optstr_wbr_create(u.create->wbr_create)); | |
26135 | + switch (u.create->wbr_create) { | |
26136 | + case AuWbrCreate_MFSV: | |
26137 | + case AuWbrCreate_PMFSV: | |
26138 | + AuDbg("%d sec\n", u.create->mfs_second); | |
26139 | + break; | |
26140 | + case AuWbrCreate_MFSRR: | |
f2c43d5f | 26141 | + case AuWbrCreate_TDMFS: |
1facf9fc | 26142 | + AuDbg("%llu watermark\n", |
26143 | + u.create->mfsrr_watermark); | |
26144 | + break; | |
26145 | + case AuWbrCreate_MFSRRV: | |
f2c43d5f | 26146 | + case AuWbrCreate_TDMFSV: |
392086de | 26147 | + case AuWbrCreate_PMFSRRV: |
1facf9fc | 26148 | + AuDbg("%llu watermark, %d sec\n", |
26149 | + u.create->mfsrr_watermark, | |
26150 | + u.create->mfs_second); | |
26151 | + break; | |
26152 | + } | |
26153 | + break; | |
26154 | + case Opt_wbr_copyup: | |
26155 | + AuDbg("copyup %d, %s\n", opt->wbr_copyup, | |
26156 | + au_optstr_wbr_copyup(opt->wbr_copyup)); | |
26157 | + break; | |
076b876e AM |
26158 | + case Opt_fhsm_sec: |
26159 | + AuDbg("fhsm_sec %u\n", opt->fhsm_second); | |
26160 | + break; | |
8b6a4947 AM |
26161 | + case Opt_dirren: |
26162 | + AuLabel(dirren); | |
26163 | + break; | |
26164 | + case Opt_nodirren: | |
26165 | + AuLabel(nodirren); | |
26166 | + break; | |
c1595e42 JR |
26167 | + case Opt_acl: |
26168 | + AuLabel(acl); | |
26169 | + break; | |
26170 | + case Opt_noacl: | |
26171 | + AuLabel(noacl); | |
26172 | + break; | |
1facf9fc | 26173 | + default: |
26174 | + BUG(); | |
26175 | + } | |
26176 | + opt++; | |
26177 | + } | |
26178 | +#endif | |
26179 | +} | |
26180 | + | |
26181 | +void au_opts_free(struct au_opts *opts) | |
26182 | +{ | |
26183 | + struct au_opt *opt; | |
26184 | + | |
26185 | + opt = opts->opt; | |
26186 | + while (opt->type != Opt_tail) { | |
26187 | + switch (opt->type) { | |
26188 | + case Opt_add: | |
26189 | + case Opt_append: | |
26190 | + case Opt_prepend: | |
26191 | + path_put(&opt->add.path); | |
26192 | + break; | |
26193 | + case Opt_del: | |
26194 | + case Opt_idel: | |
26195 | + path_put(&opt->del.h_path); | |
26196 | + break; | |
26197 | + case Opt_mod: | |
26198 | + case Opt_imod: | |
26199 | + dput(opt->mod.h_root); | |
26200 | + break; | |
26201 | + case Opt_xino: | |
26202 | + fput(opt->xino.file); | |
26203 | + break; | |
26204 | + } | |
26205 | + opt++; | |
26206 | + } | |
26207 | +} | |
26208 | + | |
26209 | +static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags, | |
26210 | + aufs_bindex_t bindex) | |
26211 | +{ | |
26212 | + int err; | |
26213 | + struct au_opt_add *add = &opt->add; | |
26214 | + char *p; | |
26215 | + | |
26216 | + add->bindex = bindex; | |
1e00d052 | 26217 | + add->perm = AuBrPerm_RO; |
1facf9fc | 26218 | + add->pathname = opt_str; |
26219 | + p = strchr(opt_str, '='); | |
26220 | + if (p) { | |
26221 | + *p++ = 0; | |
26222 | + if (*p) | |
26223 | + add->perm = br_perm_val(p); | |
26224 | + } | |
26225 | + | |
26226 | + err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path); | |
26227 | + if (!err) { | |
26228 | + if (!p) { | |
26229 | + add->perm = AuBrPerm_RO; | |
26230 | + if (au_test_fs_rr(add->path.dentry->d_sb)) | |
26231 | + add->perm = AuBrPerm_RR; | |
2121bcd9 | 26232 | + else if (!bindex && !(sb_flags & SB_RDONLY)) |
1facf9fc | 26233 | + add->perm = AuBrPerm_RW; |
26234 | + } | |
26235 | + opt->type = Opt_add; | |
26236 | + goto out; | |
26237 | + } | |
4a4d8108 | 26238 | + pr_err("lookup failed %s (%d)\n", add->pathname, err); |
1facf9fc | 26239 | + err = -EINVAL; |
26240 | + | |
4f0767ce | 26241 | +out: |
1facf9fc | 26242 | + return err; |
26243 | +} | |
26244 | + | |
26245 | +static int au_opts_parse_del(struct au_opt_del *del, substring_t args[]) | |
26246 | +{ | |
26247 | + int err; | |
26248 | + | |
26249 | + del->pathname = args[0].from; | |
26250 | + AuDbg("del path %s\n", del->pathname); | |
26251 | + | |
26252 | + err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path); | |
26253 | + if (unlikely(err)) | |
4a4d8108 | 26254 | + pr_err("lookup failed %s (%d)\n", del->pathname, err); |
1facf9fc | 26255 | + |
26256 | + return err; | |
26257 | +} | |
26258 | + | |
26259 | +#if 0 /* reserved for future use */ | |
26260 | +static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex, | |
26261 | + struct au_opt_del *del, substring_t args[]) | |
26262 | +{ | |
26263 | + int err; | |
26264 | + struct dentry *root; | |
26265 | + | |
26266 | + err = -EINVAL; | |
26267 | + root = sb->s_root; | |
26268 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26269 | + if (bindex < 0 || au_sbbot(sb) < bindex) { |
4a4d8108 | 26270 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 26271 | + goto out; |
26272 | + } | |
26273 | + | |
26274 | + err = 0; | |
26275 | + del->h_path.dentry = dget(au_h_dptr(root, bindex)); | |
26276 | + del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex)); | |
26277 | + | |
4f0767ce | 26278 | +out: |
1facf9fc | 26279 | + aufs_read_unlock(root, !AuLock_IR); |
26280 | + return err; | |
26281 | +} | |
26282 | +#endif | |
26283 | + | |
4a4d8108 AM |
26284 | +static int noinline_for_stack |
26285 | +au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[]) | |
1facf9fc | 26286 | +{ |
26287 | + int err; | |
26288 | + struct path path; | |
26289 | + char *p; | |
26290 | + | |
26291 | + err = -EINVAL; | |
26292 | + mod->path = args[0].from; | |
26293 | + p = strchr(mod->path, '='); | |
26294 | + if (unlikely(!p)) { | |
4a4d8108 | 26295 | + pr_err("no permssion %s\n", args[0].from); |
1facf9fc | 26296 | + goto out; |
26297 | + } | |
26298 | + | |
26299 | + *p++ = 0; | |
26300 | + err = vfsub_kern_path(mod->path, lkup_dirflags, &path); | |
26301 | + if (unlikely(err)) { | |
4a4d8108 | 26302 | + pr_err("lookup failed %s (%d)\n", mod->path, err); |
1facf9fc | 26303 | + goto out; |
26304 | + } | |
26305 | + | |
26306 | + mod->perm = br_perm_val(p); | |
26307 | + AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p); | |
26308 | + mod->h_root = dget(path.dentry); | |
26309 | + path_put(&path); | |
26310 | + | |
4f0767ce | 26311 | +out: |
1facf9fc | 26312 | + return err; |
26313 | +} | |
26314 | + | |
26315 | +#if 0 /* reserved for future use */ | |
26316 | +static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex, | |
26317 | + struct au_opt_mod *mod, substring_t args[]) | |
26318 | +{ | |
26319 | + int err; | |
26320 | + struct dentry *root; | |
26321 | + | |
26322 | + err = -EINVAL; | |
26323 | + root = sb->s_root; | |
26324 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26325 | + if (bindex < 0 || au_sbbot(sb) < bindex) { |
4a4d8108 | 26326 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 26327 | + goto out; |
26328 | + } | |
26329 | + | |
26330 | + err = 0; | |
26331 | + mod->perm = br_perm_val(args[1].from); | |
26332 | + AuDbg("mod path %s, perm 0x%x, %s\n", | |
26333 | + mod->path, mod->perm, args[1].from); | |
26334 | + mod->h_root = dget(au_h_dptr(root, bindex)); | |
26335 | + | |
4f0767ce | 26336 | +out: |
1facf9fc | 26337 | + aufs_read_unlock(root, !AuLock_IR); |
26338 | + return err; | |
26339 | +} | |
26340 | +#endif | |
26341 | + | |
26342 | +static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino, | |
26343 | + substring_t args[]) | |
26344 | +{ | |
26345 | + int err; | |
26346 | + struct file *file; | |
26347 | + | |
26348 | + file = au_xino_create(sb, args[0].from, /*silent*/0); | |
26349 | + err = PTR_ERR(file); | |
26350 | + if (IS_ERR(file)) | |
26351 | + goto out; | |
26352 | + | |
26353 | + err = -EINVAL; | |
2000de60 | 26354 | + if (unlikely(file->f_path.dentry->d_sb == sb)) { |
1facf9fc | 26355 | + fput(file); |
4a4d8108 | 26356 | + pr_err("%s must be outside\n", args[0].from); |
1facf9fc | 26357 | + goto out; |
26358 | + } | |
26359 | + | |
26360 | + err = 0; | |
26361 | + xino->file = file; | |
26362 | + xino->path = args[0].from; | |
26363 | + | |
4f0767ce | 26364 | +out: |
1facf9fc | 26365 | + return err; |
26366 | +} | |
26367 | + | |
4a4d8108 AM |
26368 | +static int noinline_for_stack |
26369 | +au_opts_parse_xino_itrunc_path(struct super_block *sb, | |
26370 | + struct au_opt_xino_itrunc *xino_itrunc, | |
26371 | + substring_t args[]) | |
1facf9fc | 26372 | +{ |
26373 | + int err; | |
5afbbe0d | 26374 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 26375 | + struct path path; |
26376 | + struct dentry *root; | |
26377 | + | |
26378 | + err = vfsub_kern_path(args[0].from, lkup_dirflags, &path); | |
26379 | + if (unlikely(err)) { | |
4a4d8108 | 26380 | + pr_err("lookup failed %s (%d)\n", args[0].from, err); |
1facf9fc | 26381 | + goto out; |
26382 | + } | |
26383 | + | |
26384 | + xino_itrunc->bindex = -1; | |
26385 | + root = sb->s_root; | |
26386 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d AM |
26387 | + bbot = au_sbbot(sb); |
26388 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
1facf9fc | 26389 | + if (au_h_dptr(root, bindex) == path.dentry) { |
26390 | + xino_itrunc->bindex = bindex; | |
26391 | + break; | |
26392 | + } | |
26393 | + } | |
26394 | + aufs_read_unlock(root, !AuLock_IR); | |
26395 | + path_put(&path); | |
26396 | + | |
26397 | + if (unlikely(xino_itrunc->bindex < 0)) { | |
4a4d8108 | 26398 | + pr_err("no such branch %s\n", args[0].from); |
1facf9fc | 26399 | + err = -EINVAL; |
26400 | + } | |
26401 | + | |
4f0767ce | 26402 | +out: |
1facf9fc | 26403 | + return err; |
26404 | +} | |
26405 | + | |
26406 | +/* called without aufs lock */ | |
26407 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts) | |
26408 | +{ | |
26409 | + int err, n, token; | |
26410 | + aufs_bindex_t bindex; | |
26411 | + unsigned char skipped; | |
26412 | + struct dentry *root; | |
26413 | + struct au_opt *opt, *opt_tail; | |
26414 | + char *opt_str; | |
26415 | + /* reduce the stack space */ | |
26416 | + union { | |
26417 | + struct au_opt_xino_itrunc *xino_itrunc; | |
26418 | + struct au_opt_wbr_create *create; | |
26419 | + } u; | |
26420 | + struct { | |
26421 | + substring_t args[MAX_OPT_ARGS]; | |
26422 | + } *a; | |
26423 | + | |
26424 | + err = -ENOMEM; | |
26425 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
26426 | + if (unlikely(!a)) | |
26427 | + goto out; | |
26428 | + | |
26429 | + root = sb->s_root; | |
26430 | + err = 0; | |
26431 | + bindex = 0; | |
26432 | + opt = opts->opt; | |
26433 | + opt_tail = opt + opts->max_opt - 1; | |
26434 | + opt->type = Opt_tail; | |
26435 | + while (!err && (opt_str = strsep(&str, ",")) && *opt_str) { | |
26436 | + err = -EINVAL; | |
26437 | + skipped = 0; | |
26438 | + token = match_token(opt_str, options, a->args); | |
26439 | + switch (token) { | |
26440 | + case Opt_br: | |
26441 | + err = 0; | |
26442 | + while (!err && (opt_str = strsep(&a->args[0].from, ":")) | |
26443 | + && *opt_str) { | |
26444 | + err = opt_add(opt, opt_str, opts->sb_flags, | |
26445 | + bindex++); | |
26446 | + if (unlikely(!err && ++opt > opt_tail)) { | |
26447 | + err = -E2BIG; | |
26448 | + break; | |
26449 | + } | |
26450 | + opt->type = Opt_tail; | |
26451 | + skipped = 1; | |
26452 | + } | |
26453 | + break; | |
26454 | + case Opt_add: | |
26455 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26456 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26457 | + break; |
26458 | + } | |
26459 | + bindex = n; | |
26460 | + err = opt_add(opt, a->args[1].from, opts->sb_flags, | |
26461 | + bindex); | |
26462 | + if (!err) | |
26463 | + opt->type = token; | |
26464 | + break; | |
26465 | + case Opt_append: | |
26466 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
26467 | + /*dummy bindex*/1); | |
26468 | + if (!err) | |
26469 | + opt->type = token; | |
26470 | + break; | |
26471 | + case Opt_prepend: | |
26472 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
26473 | + /*bindex*/0); | |
26474 | + if (!err) | |
26475 | + opt->type = token; | |
26476 | + break; | |
26477 | + case Opt_del: | |
26478 | + err = au_opts_parse_del(&opt->del, a->args); | |
26479 | + if (!err) | |
26480 | + opt->type = token; | |
26481 | + break; | |
26482 | +#if 0 /* reserved for future use */ | |
26483 | + case Opt_idel: | |
26484 | + del->pathname = "(indexed)"; | |
26485 | + if (unlikely(match_int(&args[0], &n))) { | |
4a4d8108 | 26486 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26487 | + break; |
26488 | + } | |
26489 | + err = au_opts_parse_idel(sb, n, &opt->del, a->args); | |
26490 | + if (!err) | |
26491 | + opt->type = token; | |
26492 | + break; | |
26493 | +#endif | |
26494 | + case Opt_mod: | |
26495 | + err = au_opts_parse_mod(&opt->mod, a->args); | |
26496 | + if (!err) | |
26497 | + opt->type = token; | |
26498 | + break; | |
26499 | +#ifdef IMOD /* reserved for future use */ | |
26500 | + case Opt_imod: | |
26501 | + u.mod->path = "(indexed)"; | |
26502 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26503 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26504 | + break; |
26505 | + } | |
26506 | + err = au_opts_parse_imod(sb, n, &opt->mod, a->args); | |
26507 | + if (!err) | |
26508 | + opt->type = token; | |
26509 | + break; | |
26510 | +#endif | |
26511 | + case Opt_xino: | |
26512 | + err = au_opts_parse_xino(sb, &opt->xino, a->args); | |
26513 | + if (!err) | |
26514 | + opt->type = token; | |
26515 | + break; | |
26516 | + | |
26517 | + case Opt_trunc_xino_path: | |
26518 | + err = au_opts_parse_xino_itrunc_path | |
26519 | + (sb, &opt->xino_itrunc, a->args); | |
26520 | + if (!err) | |
26521 | + opt->type = token; | |
26522 | + break; | |
26523 | + | |
26524 | + case Opt_itrunc_xino: | |
26525 | + u.xino_itrunc = &opt->xino_itrunc; | |
26526 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 26527 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26528 | + break; |
26529 | + } | |
26530 | + u.xino_itrunc->bindex = n; | |
26531 | + aufs_read_lock(root, AuLock_FLUSH); | |
5afbbe0d | 26532 | + if (n < 0 || au_sbbot(sb) < n) { |
4a4d8108 | 26533 | + pr_err("out of bounds, %d\n", n); |
1facf9fc | 26534 | + aufs_read_unlock(root, !AuLock_IR); |
26535 | + break; | |
26536 | + } | |
26537 | + aufs_read_unlock(root, !AuLock_IR); | |
26538 | + err = 0; | |
26539 | + opt->type = token; | |
26540 | + break; | |
26541 | + | |
26542 | + case Opt_dirwh: | |
26543 | + if (unlikely(match_int(&a->args[0], &opt->dirwh))) | |
26544 | + break; | |
26545 | + err = 0; | |
26546 | + opt->type = token; | |
26547 | + break; | |
26548 | + | |
26549 | + case Opt_rdcache: | |
027c5e7a AM |
26550 | + if (unlikely(match_int(&a->args[0], &n))) { |
26551 | + pr_err("bad integer in %s\n", opt_str); | |
1facf9fc | 26552 | + break; |
027c5e7a AM |
26553 | + } |
26554 | + if (unlikely(n > AUFS_RDCACHE_MAX)) { | |
26555 | + pr_err("rdcache must be smaller than %d\n", | |
26556 | + AUFS_RDCACHE_MAX); | |
26557 | + break; | |
26558 | + } | |
26559 | + opt->rdcache = n; | |
1facf9fc | 26560 | + err = 0; |
26561 | + opt->type = token; | |
26562 | + break; | |
26563 | + case Opt_rdblk: | |
26564 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 26565 | + || n < 0 |
1facf9fc | 26566 | + || n > KMALLOC_MAX_SIZE)) { |
4a4d8108 | 26567 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26568 | + break; |
26569 | + } | |
1308ab2a | 26570 | + if (unlikely(n && n < NAME_MAX)) { |
4a4d8108 AM |
26571 | + pr_err("rdblk must be larger than %d\n", |
26572 | + NAME_MAX); | |
1facf9fc | 26573 | + break; |
26574 | + } | |
26575 | + opt->rdblk = n; | |
26576 | + err = 0; | |
26577 | + opt->type = token; | |
26578 | + break; | |
26579 | + case Opt_rdhash: | |
26580 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 26581 | + || n < 0 |
1facf9fc | 26582 | + || n * sizeof(struct hlist_head) |
26583 | + > KMALLOC_MAX_SIZE)) { | |
4a4d8108 | 26584 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 26585 | + break; |
26586 | + } | |
26587 | + opt->rdhash = n; | |
26588 | + err = 0; | |
26589 | + opt->type = token; | |
26590 | + break; | |
26591 | + | |
26592 | + case Opt_trunc_xino: | |
26593 | + case Opt_notrunc_xino: | |
26594 | + case Opt_noxino: | |
26595 | + case Opt_trunc_xib: | |
26596 | + case Opt_notrunc_xib: | |
dece6358 AM |
26597 | + case Opt_shwh: |
26598 | + case Opt_noshwh: | |
076b876e AM |
26599 | + case Opt_dirperm1: |
26600 | + case Opt_nodirperm1: | |
1facf9fc | 26601 | + case Opt_plink: |
26602 | + case Opt_noplink: | |
26603 | + case Opt_list_plink: | |
4a4d8108 AM |
26604 | + case Opt_dio: |
26605 | + case Opt_nodio: | |
1facf9fc | 26606 | + case Opt_diropq_a: |
26607 | + case Opt_diropq_w: | |
26608 | + case Opt_warn_perm: | |
26609 | + case Opt_nowarn_perm: | |
1facf9fc | 26610 | + case Opt_verbose: |
26611 | + case Opt_noverbose: | |
26612 | + case Opt_sum: | |
26613 | + case Opt_nosum: | |
26614 | + case Opt_wsum: | |
dece6358 AM |
26615 | + case Opt_rdblk_def: |
26616 | + case Opt_rdhash_def: | |
8b6a4947 AM |
26617 | + case Opt_dirren: |
26618 | + case Opt_nodirren: | |
c1595e42 JR |
26619 | + case Opt_acl: |
26620 | + case Opt_noacl: | |
1facf9fc | 26621 | + err = 0; |
26622 | + opt->type = token; | |
26623 | + break; | |
26624 | + | |
26625 | + case Opt_udba: | |
26626 | + opt->udba = udba_val(a->args[0].from); | |
26627 | + if (opt->udba >= 0) { | |
26628 | + err = 0; | |
26629 | + opt->type = token; | |
26630 | + } else | |
4a4d8108 | 26631 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26632 | + break; |
26633 | + | |
26634 | + case Opt_wbr_create: | |
26635 | + u.create = &opt->wbr_create; | |
26636 | + u.create->wbr_create | |
26637 | + = au_wbr_create_val(a->args[0].from, u.create); | |
26638 | + if (u.create->wbr_create >= 0) { | |
26639 | + err = 0; | |
26640 | + opt->type = token; | |
26641 | + } else | |
4a4d8108 | 26642 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26643 | + break; |
26644 | + case Opt_wbr_copyup: | |
26645 | + opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from); | |
26646 | + if (opt->wbr_copyup >= 0) { | |
26647 | + err = 0; | |
26648 | + opt->type = token; | |
26649 | + } else | |
4a4d8108 | 26650 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 26651 | + break; |
26652 | + | |
076b876e AM |
26653 | + case Opt_fhsm_sec: |
26654 | + if (unlikely(match_int(&a->args[0], &n) | |
26655 | + || n < 0)) { | |
26656 | + pr_err("bad integer in %s\n", opt_str); | |
26657 | + break; | |
26658 | + } | |
26659 | + if (sysaufs_brs) { | |
26660 | + opt->fhsm_second = n; | |
26661 | + opt->type = token; | |
26662 | + } else | |
26663 | + pr_warn("ignored %s\n", opt_str); | |
26664 | + err = 0; | |
26665 | + break; | |
26666 | + | |
1facf9fc | 26667 | + case Opt_ignore: |
0c3ec466 | 26668 | + pr_warn("ignored %s\n", opt_str); |
1facf9fc | 26669 | + /*FALLTHROUGH*/ |
26670 | + case Opt_ignore_silent: | |
26671 | + skipped = 1; | |
26672 | + err = 0; | |
26673 | + break; | |
26674 | + case Opt_err: | |
4a4d8108 | 26675 | + pr_err("unknown option %s\n", opt_str); |
1facf9fc | 26676 | + break; |
26677 | + } | |
26678 | + | |
26679 | + if (!err && !skipped) { | |
26680 | + if (unlikely(++opt > opt_tail)) { | |
26681 | + err = -E2BIG; | |
26682 | + opt--; | |
26683 | + opt->type = Opt_tail; | |
26684 | + break; | |
26685 | + } | |
26686 | + opt->type = Opt_tail; | |
26687 | + } | |
26688 | + } | |
26689 | + | |
1c60b727 | 26690 | + kfree(a); |
1facf9fc | 26691 | + dump_opts(opts); |
26692 | + if (unlikely(err)) | |
26693 | + au_opts_free(opts); | |
26694 | + | |
4f0767ce | 26695 | +out: |
1facf9fc | 26696 | + return err; |
26697 | +} | |
26698 | + | |
26699 | +static int au_opt_wbr_create(struct super_block *sb, | |
26700 | + struct au_opt_wbr_create *create) | |
26701 | +{ | |
26702 | + int err; | |
26703 | + struct au_sbinfo *sbinfo; | |
26704 | + | |
dece6358 AM |
26705 | + SiMustWriteLock(sb); |
26706 | + | |
1facf9fc | 26707 | + err = 1; /* handled */ |
26708 | + sbinfo = au_sbi(sb); | |
26709 | + if (sbinfo->si_wbr_create_ops->fin) { | |
26710 | + err = sbinfo->si_wbr_create_ops->fin(sb); | |
26711 | + if (!err) | |
26712 | + err = 1; | |
26713 | + } | |
26714 | + | |
26715 | + sbinfo->si_wbr_create = create->wbr_create; | |
26716 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create; | |
26717 | + switch (create->wbr_create) { | |
26718 | + case AuWbrCreate_MFSRRV: | |
26719 | + case AuWbrCreate_MFSRR: | |
f2c43d5f AM |
26720 | + case AuWbrCreate_TDMFS: |
26721 | + case AuWbrCreate_TDMFSV: | |
392086de AM |
26722 | + case AuWbrCreate_PMFSRR: |
26723 | + case AuWbrCreate_PMFSRRV: | |
1facf9fc | 26724 | + sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark; |
26725 | + /*FALLTHROUGH*/ | |
26726 | + case AuWbrCreate_MFS: | |
26727 | + case AuWbrCreate_MFSV: | |
26728 | + case AuWbrCreate_PMFS: | |
26729 | + case AuWbrCreate_PMFSV: | |
e49829fe JR |
26730 | + sbinfo->si_wbr_mfs.mfs_expire |
26731 | + = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC); | |
1facf9fc | 26732 | + break; |
26733 | + } | |
26734 | + | |
26735 | + if (sbinfo->si_wbr_create_ops->init) | |
26736 | + sbinfo->si_wbr_create_ops->init(sb); /* ignore */ | |
26737 | + | |
26738 | + return err; | |
26739 | +} | |
26740 | + | |
26741 | +/* | |
26742 | + * returns, | |
26743 | + * plus: processed without an error | |
26744 | + * zero: unprocessed | |
26745 | + */ | |
26746 | +static int au_opt_simple(struct super_block *sb, struct au_opt *opt, | |
26747 | + struct au_opts *opts) | |
26748 | +{ | |
26749 | + int err; | |
26750 | + struct au_sbinfo *sbinfo; | |
26751 | + | |
dece6358 AM |
26752 | + SiMustWriteLock(sb); |
26753 | + | |
1facf9fc | 26754 | + err = 1; /* handled */ |
26755 | + sbinfo = au_sbi(sb); | |
26756 | + switch (opt->type) { | |
26757 | + case Opt_udba: | |
26758 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; | |
26759 | + sbinfo->si_mntflags |= opt->udba; | |
26760 | + opts->given_udba |= opt->udba; | |
26761 | + break; | |
26762 | + | |
26763 | + case Opt_plink: | |
26764 | + au_opt_set(sbinfo->si_mntflags, PLINK); | |
26765 | + break; | |
26766 | + case Opt_noplink: | |
26767 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
e49829fe | 26768 | + au_plink_put(sb, /*verbose*/1); |
1facf9fc | 26769 | + au_opt_clr(sbinfo->si_mntflags, PLINK); |
26770 | + break; | |
26771 | + case Opt_list_plink: | |
26772 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
26773 | + au_plink_list(sb); | |
26774 | + break; | |
26775 | + | |
4a4d8108 AM |
26776 | + case Opt_dio: |
26777 | + au_opt_set(sbinfo->si_mntflags, DIO); | |
26778 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
26779 | + break; | |
26780 | + case Opt_nodio: | |
26781 | + au_opt_clr(sbinfo->si_mntflags, DIO); | |
26782 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
26783 | + break; | |
26784 | + | |
076b876e AM |
26785 | + case Opt_fhsm_sec: |
26786 | + au_fhsm_set(sbinfo, opt->fhsm_second); | |
26787 | + break; | |
26788 | + | |
1facf9fc | 26789 | + case Opt_diropq_a: |
26790 | + au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
26791 | + break; | |
26792 | + case Opt_diropq_w: | |
26793 | + au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
26794 | + break; | |
26795 | + | |
26796 | + case Opt_warn_perm: | |
26797 | + au_opt_set(sbinfo->si_mntflags, WARN_PERM); | |
26798 | + break; | |
26799 | + case Opt_nowarn_perm: | |
26800 | + au_opt_clr(sbinfo->si_mntflags, WARN_PERM); | |
26801 | + break; | |
26802 | + | |
1facf9fc | 26803 | + case Opt_verbose: |
26804 | + au_opt_set(sbinfo->si_mntflags, VERBOSE); | |
26805 | + break; | |
26806 | + case Opt_noverbose: | |
26807 | + au_opt_clr(sbinfo->si_mntflags, VERBOSE); | |
26808 | + break; | |
26809 | + | |
26810 | + case Opt_sum: | |
26811 | + au_opt_set(sbinfo->si_mntflags, SUM); | |
26812 | + break; | |
26813 | + case Opt_wsum: | |
26814 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
26815 | + au_opt_set(sbinfo->si_mntflags, SUM_W); | |
26816 | + case Opt_nosum: | |
26817 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
26818 | + au_opt_clr(sbinfo->si_mntflags, SUM_W); | |
26819 | + break; | |
26820 | + | |
26821 | + case Opt_wbr_create: | |
26822 | + err = au_opt_wbr_create(sb, &opt->wbr_create); | |
26823 | + break; | |
26824 | + case Opt_wbr_copyup: | |
26825 | + sbinfo->si_wbr_copyup = opt->wbr_copyup; | |
26826 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup; | |
26827 | + break; | |
26828 | + | |
26829 | + case Opt_dirwh: | |
26830 | + sbinfo->si_dirwh = opt->dirwh; | |
26831 | + break; | |
26832 | + | |
26833 | + case Opt_rdcache: | |
e49829fe JR |
26834 | + sbinfo->si_rdcache |
26835 | + = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC); | |
1facf9fc | 26836 | + break; |
26837 | + case Opt_rdblk: | |
26838 | + sbinfo->si_rdblk = opt->rdblk; | |
26839 | + break; | |
dece6358 AM |
26840 | + case Opt_rdblk_def: |
26841 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; | |
26842 | + break; | |
1facf9fc | 26843 | + case Opt_rdhash: |
26844 | + sbinfo->si_rdhash = opt->rdhash; | |
26845 | + break; | |
dece6358 AM |
26846 | + case Opt_rdhash_def: |
26847 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
26848 | + break; | |
26849 | + | |
26850 | + case Opt_shwh: | |
26851 | + au_opt_set(sbinfo->si_mntflags, SHWH); | |
26852 | + break; | |
26853 | + case Opt_noshwh: | |
26854 | + au_opt_clr(sbinfo->si_mntflags, SHWH); | |
26855 | + break; | |
1facf9fc | 26856 | + |
076b876e AM |
26857 | + case Opt_dirperm1: |
26858 | + au_opt_set(sbinfo->si_mntflags, DIRPERM1); | |
26859 | + break; | |
26860 | + case Opt_nodirperm1: | |
26861 | + au_opt_clr(sbinfo->si_mntflags, DIRPERM1); | |
26862 | + break; | |
26863 | + | |
1facf9fc | 26864 | + case Opt_trunc_xino: |
26865 | + au_opt_set(sbinfo->si_mntflags, TRUNC_XINO); | |
26866 | + break; | |
26867 | + case Opt_notrunc_xino: | |
26868 | + au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO); | |
26869 | + break; | |
26870 | + | |
26871 | + case Opt_trunc_xino_path: | |
26872 | + case Opt_itrunc_xino: | |
26873 | + err = au_xino_trunc(sb, opt->xino_itrunc.bindex); | |
26874 | + if (!err) | |
26875 | + err = 1; | |
26876 | + break; | |
26877 | + | |
26878 | + case Opt_trunc_xib: | |
26879 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
26880 | + break; | |
26881 | + case Opt_notrunc_xib: | |
26882 | + au_fclr_opts(opts->flags, TRUNC_XIB); | |
26883 | + break; | |
26884 | + | |
8b6a4947 AM |
26885 | + case Opt_dirren: |
26886 | + err = 1; | |
26887 | + if (!au_opt_test(sbinfo->si_mntflags, DIRREN)) { | |
26888 | + err = au_dr_opt_set(sb); | |
26889 | + if (!err) | |
26890 | + err = 1; | |
26891 | + } | |
26892 | + if (err == 1) | |
26893 | + au_opt_set(sbinfo->si_mntflags, DIRREN); | |
26894 | + break; | |
26895 | + case Opt_nodirren: | |
26896 | + err = 1; | |
26897 | + if (au_opt_test(sbinfo->si_mntflags, DIRREN)) { | |
26898 | + err = au_dr_opt_clr(sb, au_ftest_opts(opts->flags, | |
26899 | + DR_FLUSHED)); | |
26900 | + if (!err) | |
26901 | + err = 1; | |
26902 | + } | |
26903 | + if (err == 1) | |
26904 | + au_opt_clr(sbinfo->si_mntflags, DIRREN); | |
26905 | + break; | |
26906 | + | |
c1595e42 | 26907 | + case Opt_acl: |
2121bcd9 | 26908 | + sb->s_flags |= SB_POSIXACL; |
c1595e42 JR |
26909 | + break; |
26910 | + case Opt_noacl: | |
2121bcd9 | 26911 | + sb->s_flags &= ~SB_POSIXACL; |
c1595e42 JR |
26912 | + break; |
26913 | + | |
1facf9fc | 26914 | + default: |
26915 | + err = 0; | |
26916 | + break; | |
26917 | + } | |
26918 | + | |
26919 | + return err; | |
26920 | +} | |
26921 | + | |
26922 | +/* | |
26923 | + * returns tri-state. | |
26924 | + * plus: processed without an error | |
26925 | + * zero: unprocessed | |
26926 | + * minus: error | |
26927 | + */ | |
26928 | +static int au_opt_br(struct super_block *sb, struct au_opt *opt, | |
26929 | + struct au_opts *opts) | |
26930 | +{ | |
26931 | + int err, do_refresh; | |
26932 | + | |
26933 | + err = 0; | |
26934 | + switch (opt->type) { | |
26935 | + case Opt_append: | |
5afbbe0d | 26936 | + opt->add.bindex = au_sbbot(sb) + 1; |
1facf9fc | 26937 | + if (opt->add.bindex < 0) |
26938 | + opt->add.bindex = 0; | |
26939 | + goto add; | |
26940 | + case Opt_prepend: | |
26941 | + opt->add.bindex = 0; | |
f6b6e03d | 26942 | + add: /* indented label */ |
1facf9fc | 26943 | + case Opt_add: |
26944 | + err = au_br_add(sb, &opt->add, | |
26945 | + au_ftest_opts(opts->flags, REMOUNT)); | |
26946 | + if (!err) { | |
26947 | + err = 1; | |
027c5e7a | 26948 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 26949 | + } |
26950 | + break; | |
26951 | + | |
26952 | + case Opt_del: | |
26953 | + case Opt_idel: | |
26954 | + err = au_br_del(sb, &opt->del, | |
26955 | + au_ftest_opts(opts->flags, REMOUNT)); | |
26956 | + if (!err) { | |
26957 | + err = 1; | |
26958 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
027c5e7a | 26959 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 26960 | + } |
26961 | + break; | |
26962 | + | |
26963 | + case Opt_mod: | |
26964 | + case Opt_imod: | |
26965 | + err = au_br_mod(sb, &opt->mod, | |
26966 | + au_ftest_opts(opts->flags, REMOUNT), | |
26967 | + &do_refresh); | |
26968 | + if (!err) { | |
26969 | + err = 1; | |
027c5e7a AM |
26970 | + if (do_refresh) |
26971 | + au_fset_opts(opts->flags, REFRESH); | |
1facf9fc | 26972 | + } |
26973 | + break; | |
26974 | + } | |
1facf9fc | 26975 | + return err; |
26976 | +} | |
26977 | + | |
26978 | +static int au_opt_xino(struct super_block *sb, struct au_opt *opt, | |
26979 | + struct au_opt_xino **opt_xino, | |
26980 | + struct au_opts *opts) | |
26981 | +{ | |
26982 | + int err; | |
5afbbe0d | 26983 | + aufs_bindex_t bbot, bindex; |
1facf9fc | 26984 | + struct dentry *root, *parent, *h_root; |
26985 | + | |
26986 | + err = 0; | |
26987 | + switch (opt->type) { | |
26988 | + case Opt_xino: | |
1facf9fc | 26989 | + au_xino_brid_set(sb, -1); |
1facf9fc | 26990 | + /* safe d_parent access */ |
2000de60 | 26991 | + parent = opt->xino.file->f_path.dentry->d_parent; |
1facf9fc | 26992 | + root = sb->s_root; |
5afbbe0d AM |
26993 | + bbot = au_sbbot(sb); |
26994 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
1facf9fc | 26995 | + h_root = au_h_dptr(root, bindex); |
26996 | + if (h_root == parent) { | |
26997 | + au_xino_brid_set(sb, au_sbr_id(sb, bindex)); | |
26998 | + break; | |
26999 | + } | |
27000 | + } | |
062440b3 AM |
27001 | + |
27002 | + err = au_xino_set(sb, &opt->xino, | |
27003 | + !!au_ftest_opts(opts->flags, REMOUNT)); | |
27004 | + if (unlikely(err)) | |
27005 | + break; | |
27006 | + | |
27007 | + *opt_xino = &opt->xino; | |
1facf9fc | 27008 | + break; |
27009 | + | |
27010 | + case Opt_noxino: | |
27011 | + au_xino_clr(sb); | |
1facf9fc | 27012 | + *opt_xino = (void *)-1; |
27013 | + break; | |
27014 | + } | |
27015 | + | |
27016 | + return err; | |
27017 | +} | |
27018 | + | |
27019 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
27020 | + unsigned int pending) | |
27021 | +{ | |
076b876e | 27022 | + int err, fhsm; |
5afbbe0d | 27023 | + aufs_bindex_t bindex, bbot; |
79b8bda9 | 27024 | + unsigned char do_plink, skip, do_free, can_no_dreval; |
1facf9fc | 27025 | + struct au_branch *br; |
27026 | + struct au_wbr *wbr; | |
79b8bda9 | 27027 | + struct dentry *root, *dentry; |
1facf9fc | 27028 | + struct inode *dir, *h_dir; |
27029 | + struct au_sbinfo *sbinfo; | |
27030 | + struct au_hinode *hdir; | |
27031 | + | |
dece6358 AM |
27032 | + SiMustAnyLock(sb); |
27033 | + | |
1facf9fc | 27034 | + sbinfo = au_sbi(sb); |
27035 | + AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA)); | |
27036 | + | |
2121bcd9 | 27037 | + if (!(sb_flags & SB_RDONLY)) { |
dece6358 | 27038 | + if (unlikely(!au_br_writable(au_sbr_perm(sb, 0)))) |
0c3ec466 | 27039 | + pr_warn("first branch should be rw\n"); |
dece6358 | 27040 | + if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH))) |
febd17d6 | 27041 | + pr_warn_once("shwh should be used with ro\n"); |
dece6358 | 27042 | + } |
1facf9fc | 27043 | + |
4a4d8108 | 27044 | + if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY) |
1facf9fc | 27045 | + && !au_opt_test(sbinfo->si_mntflags, XINO)) |
febd17d6 | 27046 | + pr_warn_once("udba=*notify requires xino\n"); |
1facf9fc | 27047 | + |
076b876e | 27048 | + if (au_opt_test(sbinfo->si_mntflags, DIRPERM1)) |
febd17d6 JR |
27049 | + pr_warn_once("dirperm1 breaks the protection" |
27050 | + " by the permission bits on the lower branch\n"); | |
076b876e | 27051 | + |
1facf9fc | 27052 | + err = 0; |
076b876e | 27053 | + fhsm = 0; |
1facf9fc | 27054 | + root = sb->s_root; |
5527c038 | 27055 | + dir = d_inode(root); |
1facf9fc | 27056 | + do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK); |
79b8bda9 AM |
27057 | + can_no_dreval = !!au_opt_test((sbinfo->si_mntflags | pending), |
27058 | + UDBA_NONE); | |
5afbbe0d AM |
27059 | + bbot = au_sbbot(sb); |
27060 | + for (bindex = 0; !err && bindex <= bbot; bindex++) { | |
1facf9fc | 27061 | + skip = 0; |
27062 | + h_dir = au_h_iptr(dir, bindex); | |
27063 | + br = au_sbr(sb, bindex); | |
1facf9fc | 27064 | + |
c1595e42 JR |
27065 | + if ((br->br_perm & AuBrAttr_ICEX) |
27066 | + && !h_dir->i_op->listxattr) | |
27067 | + br->br_perm &= ~AuBrAttr_ICEX; | |
27068 | +#if 0 | |
27069 | + if ((br->br_perm & AuBrAttr_ICEX_SEC) | |
2121bcd9 | 27070 | + && (au_br_sb(br)->s_flags & SB_NOSEC)) |
c1595e42 JR |
27071 | + br->br_perm &= ~AuBrAttr_ICEX_SEC; |
27072 | +#endif | |
27073 | + | |
27074 | + do_free = 0; | |
1facf9fc | 27075 | + wbr = br->br_wbr; |
27076 | + if (wbr) | |
27077 | + wbr_wh_read_lock(wbr); | |
27078 | + | |
1e00d052 | 27079 | + if (!au_br_writable(br->br_perm)) { |
1facf9fc | 27080 | + do_free = !!wbr; |
27081 | + skip = (!wbr | |
27082 | + || (!wbr->wbr_whbase | |
27083 | + && !wbr->wbr_plink | |
27084 | + && !wbr->wbr_orph)); | |
1e00d052 | 27085 | + } else if (!au_br_wh_linkable(br->br_perm)) { |
1facf9fc | 27086 | + /* skip = (!br->br_whbase && !br->br_orph); */ |
27087 | + skip = (!wbr || !wbr->wbr_whbase); | |
27088 | + if (skip && wbr) { | |
27089 | + if (do_plink) | |
27090 | + skip = !!wbr->wbr_plink; | |
27091 | + else | |
27092 | + skip = !wbr->wbr_plink; | |
27093 | + } | |
1e00d052 | 27094 | + } else { |
1facf9fc | 27095 | + /* skip = (br->br_whbase && br->br_ohph); */ |
27096 | + skip = (wbr && wbr->wbr_whbase); | |
27097 | + if (skip) { | |
27098 | + if (do_plink) | |
27099 | + skip = !!wbr->wbr_plink; | |
27100 | + else | |
27101 | + skip = !wbr->wbr_plink; | |
27102 | + } | |
1facf9fc | 27103 | + } |
27104 | + if (wbr) | |
27105 | + wbr_wh_read_unlock(wbr); | |
27106 | + | |
79b8bda9 AM |
27107 | + if (can_no_dreval) { |
27108 | + dentry = br->br_path.dentry; | |
27109 | + spin_lock(&dentry->d_lock); | |
27110 | + if (dentry->d_flags & | |
27111 | + (DCACHE_OP_REVALIDATE | DCACHE_OP_WEAK_REVALIDATE)) | |
27112 | + can_no_dreval = 0; | |
27113 | + spin_unlock(&dentry->d_lock); | |
27114 | + } | |
27115 | + | |
076b876e AM |
27116 | + if (au_br_fhsm(br->br_perm)) { |
27117 | + fhsm++; | |
27118 | + AuDebugOn(!br->br_fhsm); | |
27119 | + } | |
27120 | + | |
1facf9fc | 27121 | + if (skip) |
27122 | + continue; | |
27123 | + | |
27124 | + hdir = au_hi(dir, bindex); | |
5afbbe0d | 27125 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 27126 | + if (wbr) |
27127 | + wbr_wh_write_lock(wbr); | |
86dc4139 | 27128 | + err = au_wh_init(br, sb); |
1facf9fc | 27129 | + if (wbr) |
27130 | + wbr_wh_write_unlock(wbr); | |
5afbbe0d | 27131 | + au_hn_inode_unlock(hdir); |
1facf9fc | 27132 | + |
27133 | + if (!err && do_free) { | |
1c60b727 | 27134 | + kfree(wbr); |
1facf9fc | 27135 | + br->br_wbr = NULL; |
27136 | + } | |
27137 | + } | |
27138 | + | |
79b8bda9 AM |
27139 | + if (can_no_dreval) |
27140 | + au_fset_si(sbinfo, NO_DREVAL); | |
27141 | + else | |
27142 | + au_fclr_si(sbinfo, NO_DREVAL); | |
27143 | + | |
c1595e42 | 27144 | + if (fhsm >= 2) { |
076b876e | 27145 | + au_fset_si(sbinfo, FHSM); |
5afbbe0d | 27146 | + for (bindex = bbot; bindex >= 0; bindex--) { |
c1595e42 JR |
27147 | + br = au_sbr(sb, bindex); |
27148 | + if (au_br_fhsm(br->br_perm)) { | |
27149 | + au_fhsm_set_bottom(sb, bindex); | |
27150 | + break; | |
27151 | + } | |
27152 | + } | |
27153 | + } else { | |
076b876e | 27154 | + au_fclr_si(sbinfo, FHSM); |
c1595e42 JR |
27155 | + au_fhsm_set_bottom(sb, -1); |
27156 | + } | |
076b876e | 27157 | + |
1facf9fc | 27158 | + return err; |
27159 | +} | |
27160 | + | |
27161 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts) | |
27162 | +{ | |
27163 | + int err; | |
27164 | + unsigned int tmp; | |
5afbbe0d | 27165 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 27166 | + struct au_opt *opt; |
27167 | + struct au_opt_xino *opt_xino, xino; | |
27168 | + struct au_sbinfo *sbinfo; | |
027c5e7a | 27169 | + struct au_branch *br; |
076b876e | 27170 | + struct inode *dir; |
1facf9fc | 27171 | + |
dece6358 AM |
27172 | + SiMustWriteLock(sb); |
27173 | + | |
1facf9fc | 27174 | + err = 0; |
27175 | + opt_xino = NULL; | |
27176 | + opt = opts->opt; | |
27177 | + while (err >= 0 && opt->type != Opt_tail) | |
27178 | + err = au_opt_simple(sb, opt++, opts); | |
27179 | + if (err > 0) | |
27180 | + err = 0; | |
27181 | + else if (unlikely(err < 0)) | |
27182 | + goto out; | |
27183 | + | |
27184 | + /* disable xino and udba temporary */ | |
27185 | + sbinfo = au_sbi(sb); | |
27186 | + tmp = sbinfo->si_mntflags; | |
27187 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
27188 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL); | |
27189 | + | |
27190 | + opt = opts->opt; | |
27191 | + while (err >= 0 && opt->type != Opt_tail) | |
27192 | + err = au_opt_br(sb, opt++, opts); | |
27193 | + if (err > 0) | |
27194 | + err = 0; | |
27195 | + else if (unlikely(err < 0)) | |
27196 | + goto out; | |
27197 | + | |
5afbbe0d AM |
27198 | + bbot = au_sbbot(sb); |
27199 | + if (unlikely(bbot < 0)) { | |
1facf9fc | 27200 | + err = -EINVAL; |
4a4d8108 | 27201 | + pr_err("no branches\n"); |
1facf9fc | 27202 | + goto out; |
27203 | + } | |
27204 | + | |
27205 | + if (au_opt_test(tmp, XINO)) | |
27206 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
27207 | + opt = opts->opt; | |
27208 | + while (!err && opt->type != Opt_tail) | |
27209 | + err = au_opt_xino(sb, opt++, &opt_xino, opts); | |
27210 | + if (unlikely(err)) | |
27211 | + goto out; | |
27212 | + | |
27213 | + err = au_opts_verify(sb, sb->s_flags, tmp); | |
27214 | + if (unlikely(err)) | |
27215 | + goto out; | |
27216 | + | |
27217 | + /* restore xino */ | |
27218 | + if (au_opt_test(tmp, XINO) && !opt_xino) { | |
27219 | + xino.file = au_xino_def(sb); | |
27220 | + err = PTR_ERR(xino.file); | |
27221 | + if (IS_ERR(xino.file)) | |
27222 | + goto out; | |
27223 | + | |
27224 | + err = au_xino_set(sb, &xino, /*remount*/0); | |
27225 | + fput(xino.file); | |
27226 | + if (unlikely(err)) | |
27227 | + goto out; | |
27228 | + } | |
27229 | + | |
27230 | + /* restore udba */ | |
027c5e7a | 27231 | + tmp &= AuOptMask_UDBA; |
1facf9fc | 27232 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; |
027c5e7a | 27233 | + sbinfo->si_mntflags |= tmp; |
5afbbe0d AM |
27234 | + bbot = au_sbbot(sb); |
27235 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
027c5e7a AM |
27236 | + br = au_sbr(sb, bindex); |
27237 | + err = au_hnotify_reset_br(tmp, br, br->br_perm); | |
27238 | + if (unlikely(err)) | |
27239 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", | |
27240 | + bindex, err); | |
27241 | + /* go on even if err */ | |
27242 | + } | |
4a4d8108 | 27243 | + if (au_opt_test(tmp, UDBA_HNOTIFY)) { |
5527c038 | 27244 | + dir = d_inode(sb->s_root); |
4a4d8108 | 27245 | + au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO); |
1facf9fc | 27246 | + } |
27247 | + | |
4f0767ce | 27248 | +out: |
1facf9fc | 27249 | + return err; |
27250 | +} | |
27251 | + | |
27252 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts) | |
27253 | +{ | |
27254 | + int err, rerr; | |
79b8bda9 | 27255 | + unsigned char no_dreval; |
1facf9fc | 27256 | + struct inode *dir; |
27257 | + struct au_opt_xino *opt_xino; | |
27258 | + struct au_opt *opt; | |
27259 | + struct au_sbinfo *sbinfo; | |
27260 | + | |
dece6358 AM |
27261 | + SiMustWriteLock(sb); |
27262 | + | |
8b6a4947 AM |
27263 | + err = au_dr_opt_flush(sb); |
27264 | + if (unlikely(err)) | |
27265 | + goto out; | |
27266 | + au_fset_opts(opts->flags, DR_FLUSHED); | |
27267 | + | |
5527c038 | 27268 | + dir = d_inode(sb->s_root); |
1facf9fc | 27269 | + sbinfo = au_sbi(sb); |
1facf9fc | 27270 | + opt_xino = NULL; |
27271 | + opt = opts->opt; | |
27272 | + while (err >= 0 && opt->type != Opt_tail) { | |
27273 | + err = au_opt_simple(sb, opt, opts); | |
27274 | + if (!err) | |
27275 | + err = au_opt_br(sb, opt, opts); | |
27276 | + if (!err) | |
27277 | + err = au_opt_xino(sb, opt, &opt_xino, opts); | |
27278 | + opt++; | |
27279 | + } | |
27280 | + if (err > 0) | |
27281 | + err = 0; | |
27282 | + AuTraceErr(err); | |
27283 | + /* go on even err */ | |
27284 | + | |
79b8bda9 | 27285 | + no_dreval = !!au_ftest_si(sbinfo, NO_DREVAL); |
1facf9fc | 27286 | + rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0); |
27287 | + if (unlikely(rerr && !err)) | |
27288 | + err = rerr; | |
27289 | + | |
79b8bda9 | 27290 | + if (no_dreval != !!au_ftest_si(sbinfo, NO_DREVAL)) |
b95c5147 | 27291 | + au_fset_opts(opts->flags, REFRESH_IDOP); |
79b8bda9 | 27292 | + |
1facf9fc | 27293 | + if (au_ftest_opts(opts->flags, TRUNC_XIB)) { |
27294 | + rerr = au_xib_trunc(sb); | |
27295 | + if (unlikely(rerr && !err)) | |
27296 | + err = rerr; | |
27297 | + } | |
27298 | + | |
27299 | + /* will be handled by the caller */ | |
027c5e7a | 27300 | + if (!au_ftest_opts(opts->flags, REFRESH) |
79b8bda9 AM |
27301 | + && (opts->given_udba |
27302 | + || au_opt_test(sbinfo->si_mntflags, XINO) | |
b95c5147 | 27303 | + || au_ftest_opts(opts->flags, REFRESH_IDOP) |
79b8bda9 | 27304 | + )) |
027c5e7a | 27305 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 27306 | + |
27307 | + AuDbg("status 0x%x\n", opts->flags); | |
8b6a4947 AM |
27308 | + |
27309 | +out: | |
1facf9fc | 27310 | + return err; |
27311 | +} | |
27312 | + | |
27313 | +/* ---------------------------------------------------------------------- */ | |
27314 | + | |
27315 | +unsigned int au_opt_udba(struct super_block *sb) | |
27316 | +{ | |
27317 | + return au_mntflags(sb) & AuOptMask_UDBA; | |
27318 | +} | |
7f207e10 AM |
27319 | diff -urN /usr/share/empty/fs/aufs/opts.h linux/fs/aufs/opts.h |
27320 | --- /usr/share/empty/fs/aufs/opts.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 27321 | +++ linux/fs/aufs/opts.h 2018-08-12 23:43:05.460124736 +0200 |
062440b3 AM |
27322 | @@ -0,0 +1,225 @@ |
27323 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 27324 | +/* |
b00004a5 | 27325 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 27326 | + * |
27327 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27328 | + * it under the terms of the GNU General Public License as published by | |
27329 | + * the Free Software Foundation; either version 2 of the License, or | |
27330 | + * (at your option) any later version. | |
dece6358 AM |
27331 | + * |
27332 | + * This program is distributed in the hope that it will be useful, | |
27333 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27334 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27335 | + * GNU General Public License for more details. | |
27336 | + * | |
27337 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 27338 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 27339 | + */ |
27340 | + | |
27341 | +/* | |
27342 | + * mount options/flags | |
27343 | + */ | |
27344 | + | |
27345 | +#ifndef __AUFS_OPTS_H__ | |
27346 | +#define __AUFS_OPTS_H__ | |
27347 | + | |
27348 | +#ifdef __KERNEL__ | |
27349 | + | |
dece6358 | 27350 | +#include <linux/path.h> |
1facf9fc | 27351 | + |
dece6358 | 27352 | +struct file; |
dece6358 | 27353 | + |
1facf9fc | 27354 | +/* ---------------------------------------------------------------------- */ |
27355 | + | |
27356 | +/* mount flags */ | |
27357 | +#define AuOpt_XINO 1 /* external inode number bitmap | |
27358 | + and translation table */ | |
27359 | +#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */ | |
27360 | +#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */ | |
27361 | +#define AuOpt_UDBA_REVAL (1 << 3) | |
4a4d8108 | 27362 | +#define AuOpt_UDBA_HNOTIFY (1 << 4) |
dece6358 AM |
27363 | +#define AuOpt_SHWH (1 << 5) /* show whiteout */ |
27364 | +#define AuOpt_PLINK (1 << 6) /* pseudo-link */ | |
076b876e AM |
27365 | +#define AuOpt_DIRPERM1 (1 << 7) /* ignore the lower dir's perm |
27366 | + bits */ | |
dece6358 AM |
27367 | +#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */ |
27368 | +#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */ | |
27369 | +#define AuOpt_SUM_W (1 << 11) /* unimplemented */ | |
27370 | +#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */ | |
27371 | +#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */ | |
4a4d8108 | 27372 | +#define AuOpt_DIO (1 << 14) /* direct io */ |
8b6a4947 | 27373 | +#define AuOpt_DIRREN (1 << 15) /* directory rename */ |
1facf9fc | 27374 | + |
4a4d8108 AM |
27375 | +#ifndef CONFIG_AUFS_HNOTIFY |
27376 | +#undef AuOpt_UDBA_HNOTIFY | |
27377 | +#define AuOpt_UDBA_HNOTIFY 0 | |
1facf9fc | 27378 | +#endif |
8b6a4947 AM |
27379 | +#ifndef CONFIG_AUFS_DIRREN |
27380 | +#undef AuOpt_DIRREN | |
27381 | +#define AuOpt_DIRREN 0 | |
27382 | +#endif | |
dece6358 AM |
27383 | +#ifndef CONFIG_AUFS_SHWH |
27384 | +#undef AuOpt_SHWH | |
27385 | +#define AuOpt_SHWH 0 | |
27386 | +#endif | |
1facf9fc | 27387 | + |
27388 | +#define AuOpt_Def (AuOpt_XINO \ | |
27389 | + | AuOpt_UDBA_REVAL \ | |
27390 | + | AuOpt_PLINK \ | |
27391 | + /* | AuOpt_DIRPERM1 */ \ | |
27392 | + | AuOpt_WARN_PERM) | |
27393 | +#define AuOptMask_UDBA (AuOpt_UDBA_NONE \ | |
27394 | + | AuOpt_UDBA_REVAL \ | |
4a4d8108 | 27395 | + | AuOpt_UDBA_HNOTIFY) |
1facf9fc | 27396 | + |
27397 | +#define au_opt_test(flags, name) (flags & AuOpt_##name) | |
27398 | +#define au_opt_set(flags, name) do { \ | |
27399 | + BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \ | |
27400 | + ((flags) |= AuOpt_##name); \ | |
27401 | +} while (0) | |
27402 | +#define au_opt_set_udba(flags, name) do { \ | |
27403 | + (flags) &= ~AuOptMask_UDBA; \ | |
27404 | + ((flags) |= AuOpt_##name); \ | |
27405 | +} while (0) | |
7f207e10 AM |
27406 | +#define au_opt_clr(flags, name) do { \ |
27407 | + ((flags) &= ~AuOpt_##name); \ | |
27408 | +} while (0) | |
1facf9fc | 27409 | + |
e49829fe JR |
27410 | +static inline unsigned int au_opts_plink(unsigned int mntflags) |
27411 | +{ | |
27412 | +#ifdef CONFIG_PROC_FS | |
27413 | + return mntflags; | |
27414 | +#else | |
27415 | + return mntflags & ~AuOpt_PLINK; | |
27416 | +#endif | |
27417 | +} | |
27418 | + | |
1facf9fc | 27419 | +/* ---------------------------------------------------------------------- */ |
27420 | + | |
27421 | +/* policies to select one among multiple writable branches */ | |
27422 | +enum { | |
27423 | + AuWbrCreate_TDP, /* top down parent */ | |
27424 | + AuWbrCreate_RR, /* round robin */ | |
27425 | + AuWbrCreate_MFS, /* most free space */ | |
27426 | + AuWbrCreate_MFSV, /* mfs with seconds */ | |
27427 | + AuWbrCreate_MFSRR, /* mfs then rr */ | |
27428 | + AuWbrCreate_MFSRRV, /* mfs then rr with seconds */ | |
f2c43d5f AM |
27429 | + AuWbrCreate_TDMFS, /* top down regardless parent and mfs */ |
27430 | + AuWbrCreate_TDMFSV, /* top down regardless parent and mfs */ | |
1facf9fc | 27431 | + AuWbrCreate_PMFS, /* parent and mfs */ |
27432 | + AuWbrCreate_PMFSV, /* parent and mfs with seconds */ | |
392086de AM |
27433 | + AuWbrCreate_PMFSRR, /* parent, mfs and round-robin */ |
27434 | + AuWbrCreate_PMFSRRV, /* plus seconds */ | |
1facf9fc | 27435 | + |
27436 | + AuWbrCreate_Def = AuWbrCreate_TDP | |
27437 | +}; | |
27438 | + | |
27439 | +enum { | |
27440 | + AuWbrCopyup_TDP, /* top down parent */ | |
27441 | + AuWbrCopyup_BUP, /* bottom up parent */ | |
27442 | + AuWbrCopyup_BU, /* bottom up */ | |
27443 | + | |
27444 | + AuWbrCopyup_Def = AuWbrCopyup_TDP | |
27445 | +}; | |
27446 | + | |
27447 | +/* ---------------------------------------------------------------------- */ | |
27448 | + | |
27449 | +struct au_opt_add { | |
27450 | + aufs_bindex_t bindex; | |
27451 | + char *pathname; | |
27452 | + int perm; | |
27453 | + struct path path; | |
27454 | +}; | |
27455 | + | |
27456 | +struct au_opt_del { | |
27457 | + char *pathname; | |
27458 | + struct path h_path; | |
27459 | +}; | |
27460 | + | |
27461 | +struct au_opt_mod { | |
27462 | + char *path; | |
27463 | + int perm; | |
27464 | + struct dentry *h_root; | |
27465 | +}; | |
27466 | + | |
27467 | +struct au_opt_xino { | |
27468 | + char *path; | |
27469 | + struct file *file; | |
27470 | +}; | |
27471 | + | |
27472 | +struct au_opt_xino_itrunc { | |
27473 | + aufs_bindex_t bindex; | |
27474 | +}; | |
27475 | + | |
27476 | +struct au_opt_wbr_create { | |
27477 | + int wbr_create; | |
27478 | + int mfs_second; | |
27479 | + unsigned long long mfsrr_watermark; | |
27480 | +}; | |
27481 | + | |
27482 | +struct au_opt { | |
27483 | + int type; | |
27484 | + union { | |
27485 | + struct au_opt_xino xino; | |
27486 | + struct au_opt_xino_itrunc xino_itrunc; | |
27487 | + struct au_opt_add add; | |
27488 | + struct au_opt_del del; | |
27489 | + struct au_opt_mod mod; | |
27490 | + int dirwh; | |
27491 | + int rdcache; | |
27492 | + unsigned int rdblk; | |
27493 | + unsigned int rdhash; | |
27494 | + int udba; | |
27495 | + struct au_opt_wbr_create wbr_create; | |
27496 | + int wbr_copyup; | |
076b876e | 27497 | + unsigned int fhsm_second; |
1facf9fc | 27498 | + }; |
27499 | +}; | |
27500 | + | |
27501 | +/* opts flags */ | |
27502 | +#define AuOpts_REMOUNT 1 | |
027c5e7a AM |
27503 | +#define AuOpts_REFRESH (1 << 1) |
27504 | +#define AuOpts_TRUNC_XIB (1 << 2) | |
27505 | +#define AuOpts_REFRESH_DYAOP (1 << 3) | |
b95c5147 | 27506 | +#define AuOpts_REFRESH_IDOP (1 << 4) |
8b6a4947 | 27507 | +#define AuOpts_DR_FLUSHED (1 << 5) |
1facf9fc | 27508 | +#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name) |
7f207e10 AM |
27509 | +#define au_fset_opts(flags, name) \ |
27510 | + do { (flags) |= AuOpts_##name; } while (0) | |
27511 | +#define au_fclr_opts(flags, name) \ | |
27512 | + do { (flags) &= ~AuOpts_##name; } while (0) | |
1facf9fc | 27513 | + |
8b6a4947 AM |
27514 | +#ifndef CONFIG_AUFS_DIRREN |
27515 | +#undef AuOpts_DR_FLUSHED | |
27516 | +#define AuOpts_DR_FLUSHED 0 | |
27517 | +#endif | |
27518 | + | |
1facf9fc | 27519 | +struct au_opts { |
27520 | + struct au_opt *opt; | |
27521 | + int max_opt; | |
27522 | + | |
27523 | + unsigned int given_udba; | |
27524 | + unsigned int flags; | |
27525 | + unsigned long sb_flags; | |
27526 | +}; | |
27527 | + | |
27528 | +/* ---------------------------------------------------------------------- */ | |
27529 | + | |
7e9cd9fe | 27530 | +/* opts.c */ |
076b876e | 27531 | +void au_optstr_br_perm(au_br_perm_str_t *str, int perm); |
1facf9fc | 27532 | +const char *au_optstr_udba(int udba); |
27533 | +const char *au_optstr_wbr_copyup(int wbr_copyup); | |
27534 | +const char *au_optstr_wbr_create(int wbr_create); | |
27535 | + | |
27536 | +void au_opts_free(struct au_opts *opts); | |
3c1bdaff | 27537 | +struct super_block; |
1facf9fc | 27538 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts); |
27539 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
27540 | + unsigned int pending); | |
27541 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts); | |
27542 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts); | |
27543 | + | |
27544 | +unsigned int au_opt_udba(struct super_block *sb); | |
27545 | + | |
1facf9fc | 27546 | +#endif /* __KERNEL__ */ |
27547 | +#endif /* __AUFS_OPTS_H__ */ | |
7f207e10 AM |
27548 | diff -urN /usr/share/empty/fs/aufs/plink.c linux/fs/aufs/plink.c |
27549 | --- /usr/share/empty/fs/aufs/plink.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 27550 | +++ linux/fs/aufs/plink.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 27551 | @@ -0,0 +1,516 @@ |
cd7a4cd9 | 27552 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 27553 | +/* |
b00004a5 | 27554 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 27555 | + * |
27556 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27557 | + * it under the terms of the GNU General Public License as published by | |
27558 | + * the Free Software Foundation; either version 2 of the License, or | |
27559 | + * (at your option) any later version. | |
dece6358 AM |
27560 | + * |
27561 | + * This program is distributed in the hope that it will be useful, | |
27562 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27563 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27564 | + * GNU General Public License for more details. | |
27565 | + * | |
27566 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 27567 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 27568 | + */ |
27569 | + | |
27570 | +/* | |
27571 | + * pseudo-link | |
27572 | + */ | |
27573 | + | |
27574 | +#include "aufs.h" | |
27575 | + | |
27576 | +/* | |
e49829fe | 27577 | + * the pseudo-link maintenance mode. |
1facf9fc | 27578 | + * during a user process maintains the pseudo-links, |
27579 | + * prohibit adding a new plink and branch manipulation. | |
e49829fe JR |
27580 | + * |
27581 | + * Flags | |
27582 | + * NOPLM: | |
27583 | + * For entry functions which will handle plink, and i_mutex is already held | |
27584 | + * in VFS. | |
27585 | + * They cannot wait and should return an error at once. | |
27586 | + * Callers has to check the error. | |
27587 | + * NOPLMW: | |
27588 | + * For entry functions which will handle plink, but i_mutex is not held | |
27589 | + * in VFS. | |
27590 | + * They can wait the plink maintenance mode to finish. | |
27591 | + * | |
27592 | + * They behave like F_SETLK and F_SETLKW. | |
27593 | + * If the caller never handle plink, then both flags are unnecessary. | |
1facf9fc | 27594 | + */ |
e49829fe JR |
27595 | + |
27596 | +int au_plink_maint(struct super_block *sb, int flags) | |
1facf9fc | 27597 | +{ |
e49829fe JR |
27598 | + int err; |
27599 | + pid_t pid, ppid; | |
f0c0a007 | 27600 | + struct task_struct *parent, *prev; |
e49829fe | 27601 | + struct au_sbinfo *sbi; |
dece6358 AM |
27602 | + |
27603 | + SiMustAnyLock(sb); | |
27604 | + | |
e49829fe JR |
27605 | + err = 0; |
27606 | + if (!au_opt_test(au_mntflags(sb), PLINK)) | |
27607 | + goto out; | |
27608 | + | |
27609 | + sbi = au_sbi(sb); | |
27610 | + pid = sbi->si_plink_maint_pid; | |
27611 | + if (!pid || pid == current->pid) | |
27612 | + goto out; | |
27613 | + | |
27614 | + /* todo: it highly depends upon /sbin/mount.aufs */ | |
f0c0a007 AM |
27615 | + prev = NULL; |
27616 | + parent = current; | |
27617 | + ppid = 0; | |
e49829fe | 27618 | + rcu_read_lock(); |
f0c0a007 AM |
27619 | + while (1) { |
27620 | + parent = rcu_dereference(parent->real_parent); | |
27621 | + if (parent == prev) | |
27622 | + break; | |
27623 | + ppid = task_pid_vnr(parent); | |
27624 | + if (pid == ppid) { | |
27625 | + rcu_read_unlock(); | |
27626 | + goto out; | |
27627 | + } | |
27628 | + prev = parent; | |
27629 | + } | |
e49829fe | 27630 | + rcu_read_unlock(); |
e49829fe JR |
27631 | + |
27632 | + if (au_ftest_lock(flags, NOPLMW)) { | |
027c5e7a AM |
27633 | + /* if there is no i_mutex lock in VFS, we don't need to wait */ |
27634 | + /* AuDebugOn(!lockdep_depth(current)); */ | |
e49829fe JR |
27635 | + while (sbi->si_plink_maint_pid) { |
27636 | + si_read_unlock(sb); | |
27637 | + /* gave up wake_up_bit() */ | |
27638 | + wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid); | |
27639 | + | |
27640 | + if (au_ftest_lock(flags, FLUSH)) | |
27641 | + au_nwt_flush(&sbi->si_nowait); | |
27642 | + si_noflush_read_lock(sb); | |
27643 | + } | |
27644 | + } else if (au_ftest_lock(flags, NOPLM)) { | |
27645 | + AuDbg("ppid %d, pid %d\n", ppid, pid); | |
27646 | + err = -EAGAIN; | |
27647 | + } | |
27648 | + | |
27649 | +out: | |
27650 | + return err; | |
4a4d8108 AM |
27651 | +} |
27652 | + | |
e49829fe | 27653 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo) |
4a4d8108 | 27654 | +{ |
4a4d8108 | 27655 | + spin_lock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 27656 | + sbinfo->si_plink_maint_pid = 0; |
4a4d8108 | 27657 | + spin_unlock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 27658 | + wake_up_all(&sbinfo->si_plink_wq); |
4a4d8108 AM |
27659 | +} |
27660 | + | |
e49829fe | 27661 | +int au_plink_maint_enter(struct super_block *sb) |
4a4d8108 AM |
27662 | +{ |
27663 | + int err; | |
4a4d8108 AM |
27664 | + struct au_sbinfo *sbinfo; |
27665 | + | |
27666 | + err = 0; | |
4a4d8108 AM |
27667 | + sbinfo = au_sbi(sb); |
27668 | + /* make sure i am the only one in this fs */ | |
e49829fe JR |
27669 | + si_write_lock(sb, AuLock_FLUSH); |
27670 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
27671 | + spin_lock(&sbinfo->si_plink_maint_lock); | |
27672 | + if (!sbinfo->si_plink_maint_pid) | |
27673 | + sbinfo->si_plink_maint_pid = current->pid; | |
27674 | + else | |
27675 | + err = -EBUSY; | |
27676 | + spin_unlock(&sbinfo->si_plink_maint_lock); | |
27677 | + } | |
4a4d8108 AM |
27678 | + si_write_unlock(sb); |
27679 | + | |
27680 | + return err; | |
1facf9fc | 27681 | +} |
27682 | + | |
27683 | +/* ---------------------------------------------------------------------- */ | |
27684 | + | |
1facf9fc | 27685 | +#ifdef CONFIG_AUFS_DEBUG |
27686 | +void au_plink_list(struct super_block *sb) | |
27687 | +{ | |
86dc4139 | 27688 | + int i; |
1facf9fc | 27689 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
27690 | + struct hlist_bl_head *hbl; |
27691 | + struct hlist_bl_node *pos; | |
5afbbe0d | 27692 | + struct au_icntnr *icntnr; |
1facf9fc | 27693 | + |
dece6358 AM |
27694 | + SiMustAnyLock(sb); |
27695 | + | |
1facf9fc | 27696 | + sbinfo = au_sbi(sb); |
27697 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 27698 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 27699 | + |
86dc4139 | 27700 | + for (i = 0; i < AuPlink_NHASH; i++) { |
8b6a4947 AM |
27701 | + hbl = sbinfo->si_plink + i; |
27702 | + hlist_bl_lock(hbl); | |
27703 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) | |
5afbbe0d | 27704 | + AuDbg("%lu\n", icntnr->vfs_inode.i_ino); |
8b6a4947 | 27705 | + hlist_bl_unlock(hbl); |
86dc4139 | 27706 | + } |
1facf9fc | 27707 | +} |
27708 | +#endif | |
27709 | + | |
27710 | +/* is the inode pseudo-linked? */ | |
27711 | +int au_plink_test(struct inode *inode) | |
27712 | +{ | |
86dc4139 | 27713 | + int found, i; |
1facf9fc | 27714 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
27715 | + struct hlist_bl_head *hbl; |
27716 | + struct hlist_bl_node *pos; | |
5afbbe0d | 27717 | + struct au_icntnr *icntnr; |
1facf9fc | 27718 | + |
27719 | + sbinfo = au_sbi(inode->i_sb); | |
dece6358 | 27720 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
1facf9fc | 27721 | + AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK)); |
e49829fe | 27722 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
1facf9fc | 27723 | + |
27724 | + found = 0; | |
86dc4139 | 27725 | + i = au_plink_hash(inode->i_ino); |
8b6a4947 AM |
27726 | + hbl = sbinfo->si_plink + i; |
27727 | + hlist_bl_lock(hbl); | |
27728 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) | |
5afbbe0d | 27729 | + if (&icntnr->vfs_inode == inode) { |
1facf9fc | 27730 | + found = 1; |
27731 | + break; | |
27732 | + } | |
8b6a4947 | 27733 | + hlist_bl_unlock(hbl); |
1facf9fc | 27734 | + return found; |
27735 | +} | |
27736 | + | |
27737 | +/* ---------------------------------------------------------------------- */ | |
27738 | + | |
27739 | +/* | |
27740 | + * generate a name for plink. | |
27741 | + * the file will be stored under AUFS_WH_PLINKDIR. | |
27742 | + */ | |
27743 | +/* 20 is max digits length of ulong 64 */ | |
27744 | +#define PLINK_NAME_LEN ((20 + 1) * 2) | |
27745 | + | |
27746 | +static int plink_name(char *name, int len, struct inode *inode, | |
27747 | + aufs_bindex_t bindex) | |
27748 | +{ | |
27749 | + int rlen; | |
27750 | + struct inode *h_inode; | |
27751 | + | |
27752 | + h_inode = au_h_iptr(inode, bindex); | |
27753 | + rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino); | |
27754 | + return rlen; | |
27755 | +} | |
27756 | + | |
7f207e10 AM |
27757 | +struct au_do_plink_lkup_args { |
27758 | + struct dentry **errp; | |
27759 | + struct qstr *tgtname; | |
27760 | + struct dentry *h_parent; | |
27761 | + struct au_branch *br; | |
27762 | +}; | |
27763 | + | |
27764 | +static struct dentry *au_do_plink_lkup(struct qstr *tgtname, | |
27765 | + struct dentry *h_parent, | |
27766 | + struct au_branch *br) | |
27767 | +{ | |
27768 | + struct dentry *h_dentry; | |
febd17d6 | 27769 | + struct inode *h_inode; |
7f207e10 | 27770 | + |
febd17d6 | 27771 | + h_inode = d_inode(h_parent); |
be118d29 | 27772 | + inode_lock_shared_nested(h_inode, AuLsc_I_CHILD2); |
b4510431 | 27773 | + h_dentry = vfsub_lkup_one(tgtname, h_parent); |
3c1bdaff | 27774 | + inode_unlock_shared(h_inode); |
7f207e10 AM |
27775 | + return h_dentry; |
27776 | +} | |
27777 | + | |
27778 | +static void au_call_do_plink_lkup(void *args) | |
27779 | +{ | |
27780 | + struct au_do_plink_lkup_args *a = args; | |
27781 | + *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br); | |
27782 | +} | |
27783 | + | |
1facf9fc | 27784 | +/* lookup the plink-ed @inode under the branch at @bindex */ |
27785 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex) | |
27786 | +{ | |
27787 | + struct dentry *h_dentry, *h_parent; | |
27788 | + struct au_branch *br; | |
7f207e10 | 27789 | + int wkq_err; |
1facf9fc | 27790 | + char a[PLINK_NAME_LEN]; |
0c3ec466 | 27791 | + struct qstr tgtname = QSTR_INIT(a, 0); |
1facf9fc | 27792 | + |
e49829fe JR |
27793 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
27794 | + | |
1facf9fc | 27795 | + br = au_sbr(inode->i_sb, bindex); |
27796 | + h_parent = br->br_wbr->wbr_plink; | |
1facf9fc | 27797 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); |
27798 | + | |
2dfbb274 | 27799 | + if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { |
7f207e10 AM |
27800 | + struct au_do_plink_lkup_args args = { |
27801 | + .errp = &h_dentry, | |
27802 | + .tgtname = &tgtname, | |
27803 | + .h_parent = h_parent, | |
27804 | + .br = br | |
27805 | + }; | |
27806 | + | |
27807 | + wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args); | |
27808 | + if (unlikely(wkq_err)) | |
27809 | + h_dentry = ERR_PTR(wkq_err); | |
27810 | + } else | |
27811 | + h_dentry = au_do_plink_lkup(&tgtname, h_parent, br); | |
27812 | + | |
1facf9fc | 27813 | + return h_dentry; |
27814 | +} | |
27815 | + | |
27816 | +/* create a pseudo-link */ | |
27817 | +static int do_whplink(struct qstr *tgt, struct dentry *h_parent, | |
27818 | + struct dentry *h_dentry, struct au_branch *br) | |
27819 | +{ | |
27820 | + int err; | |
27821 | + struct path h_path = { | |
86dc4139 | 27822 | + .mnt = au_br_mnt(br) |
1facf9fc | 27823 | + }; |
523b37e3 | 27824 | + struct inode *h_dir, *delegated; |
1facf9fc | 27825 | + |
5527c038 | 27826 | + h_dir = d_inode(h_parent); |
febd17d6 | 27827 | + inode_lock_nested(h_dir, AuLsc_I_CHILD2); |
4f0767ce | 27828 | +again: |
b4510431 | 27829 | + h_path.dentry = vfsub_lkup_one(tgt, h_parent); |
1facf9fc | 27830 | + err = PTR_ERR(h_path.dentry); |
27831 | + if (IS_ERR(h_path.dentry)) | |
27832 | + goto out; | |
27833 | + | |
27834 | + err = 0; | |
27835 | + /* wh.plink dir is not monitored */ | |
7f207e10 | 27836 | + /* todo: is it really safe? */ |
5527c038 JR |
27837 | + if (d_is_positive(h_path.dentry) |
27838 | + && d_inode(h_path.dentry) != d_inode(h_dentry)) { | |
523b37e3 AM |
27839 | + delegated = NULL; |
27840 | + err = vfsub_unlink(h_dir, &h_path, &delegated, /*force*/0); | |
27841 | + if (unlikely(err == -EWOULDBLOCK)) { | |
27842 | + pr_warn("cannot retry for NFSv4 delegation" | |
27843 | + " for an internal unlink\n"); | |
27844 | + iput(delegated); | |
27845 | + } | |
1facf9fc | 27846 | + dput(h_path.dentry); |
27847 | + h_path.dentry = NULL; | |
27848 | + if (!err) | |
27849 | + goto again; | |
27850 | + } | |
5527c038 | 27851 | + if (!err && d_is_negative(h_path.dentry)) { |
523b37e3 AM |
27852 | + delegated = NULL; |
27853 | + err = vfsub_link(h_dentry, h_dir, &h_path, &delegated); | |
27854 | + if (unlikely(err == -EWOULDBLOCK)) { | |
27855 | + pr_warn("cannot retry for NFSv4 delegation" | |
27856 | + " for an internal link\n"); | |
27857 | + iput(delegated); | |
27858 | + } | |
27859 | + } | |
1facf9fc | 27860 | + dput(h_path.dentry); |
27861 | + | |
4f0767ce | 27862 | +out: |
febd17d6 | 27863 | + inode_unlock(h_dir); |
1facf9fc | 27864 | + return err; |
27865 | +} | |
27866 | + | |
27867 | +struct do_whplink_args { | |
27868 | + int *errp; | |
27869 | + struct qstr *tgt; | |
27870 | + struct dentry *h_parent; | |
27871 | + struct dentry *h_dentry; | |
27872 | + struct au_branch *br; | |
27873 | +}; | |
27874 | + | |
27875 | +static void call_do_whplink(void *args) | |
27876 | +{ | |
27877 | + struct do_whplink_args *a = args; | |
27878 | + *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br); | |
27879 | +} | |
27880 | + | |
27881 | +static int whplink(struct dentry *h_dentry, struct inode *inode, | |
27882 | + aufs_bindex_t bindex, struct au_branch *br) | |
27883 | +{ | |
27884 | + int err, wkq_err; | |
27885 | + struct au_wbr *wbr; | |
27886 | + struct dentry *h_parent; | |
1facf9fc | 27887 | + char a[PLINK_NAME_LEN]; |
0c3ec466 | 27888 | + struct qstr tgtname = QSTR_INIT(a, 0); |
1facf9fc | 27889 | + |
27890 | + wbr = au_sbr(inode->i_sb, bindex)->br_wbr; | |
27891 | + h_parent = wbr->wbr_plink; | |
1facf9fc | 27892 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); |
27893 | + | |
27894 | + /* always superio. */ | |
2dfbb274 | 27895 | + if (!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)) { |
1facf9fc | 27896 | + struct do_whplink_args args = { |
27897 | + .errp = &err, | |
27898 | + .tgt = &tgtname, | |
27899 | + .h_parent = h_parent, | |
27900 | + .h_dentry = h_dentry, | |
27901 | + .br = br | |
27902 | + }; | |
27903 | + wkq_err = au_wkq_wait(call_do_whplink, &args); | |
27904 | + if (unlikely(wkq_err)) | |
27905 | + err = wkq_err; | |
27906 | + } else | |
27907 | + err = do_whplink(&tgtname, h_parent, h_dentry, br); | |
1facf9fc | 27908 | + |
27909 | + return err; | |
27910 | +} | |
27911 | + | |
1facf9fc | 27912 | +/* |
27913 | + * create a new pseudo-link for @h_dentry on @bindex. | |
27914 | + * the linked inode is held in aufs @inode. | |
27915 | + */ | |
27916 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
27917 | + struct dentry *h_dentry) | |
27918 | +{ | |
27919 | + struct super_block *sb; | |
27920 | + struct au_sbinfo *sbinfo; | |
8b6a4947 AM |
27921 | + struct hlist_bl_head *hbl; |
27922 | + struct hlist_bl_node *pos; | |
5afbbe0d | 27923 | + struct au_icntnr *icntnr; |
86dc4139 | 27924 | + int found, err, cnt, i; |
1facf9fc | 27925 | + |
27926 | + sb = inode->i_sb; | |
27927 | + sbinfo = au_sbi(sb); | |
27928 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 27929 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 27930 | + |
86dc4139 | 27931 | + found = au_plink_test(inode); |
4a4d8108 | 27932 | + if (found) |
1facf9fc | 27933 | + return; |
4a4d8108 | 27934 | + |
86dc4139 | 27935 | + i = au_plink_hash(inode->i_ino); |
8b6a4947 | 27936 | + hbl = sbinfo->si_plink + i; |
5afbbe0d | 27937 | + au_igrab(inode); |
1facf9fc | 27938 | + |
8b6a4947 AM |
27939 | + hlist_bl_lock(hbl); |
27940 | + hlist_bl_for_each_entry(icntnr, pos, hbl, plink) { | |
5afbbe0d | 27941 | + if (&icntnr->vfs_inode == inode) { |
4a4d8108 AM |
27942 | + found = 1; |
27943 | + break; | |
27944 | + } | |
1facf9fc | 27945 | + } |
5afbbe0d AM |
27946 | + if (!found) { |
27947 | + icntnr = container_of(inode, struct au_icntnr, vfs_inode); | |
8b6a4947 | 27948 | + hlist_bl_add_head(&icntnr->plink, hbl); |
5afbbe0d | 27949 | + } |
8b6a4947 | 27950 | + hlist_bl_unlock(hbl); |
4a4d8108 | 27951 | + if (!found) { |
8b6a4947 | 27952 | + cnt = au_hbl_count(hbl); |
86dc4139 AM |
27953 | +#define msg "unexpectedly unblanced or too many pseudo-links" |
27954 | + if (cnt > AUFS_PLINK_WARN) | |
27955 | + AuWarn1(msg ", %d\n", cnt); | |
27956 | +#undef msg | |
1facf9fc | 27957 | + err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex)); |
5afbbe0d AM |
27958 | + if (unlikely(err)) { |
27959 | + pr_warn("err %d, damaged pseudo link.\n", err); | |
8b6a4947 | 27960 | + au_hbl_del(&icntnr->plink, hbl); |
5afbbe0d | 27961 | + iput(&icntnr->vfs_inode); |
4a4d8108 | 27962 | + } |
5afbbe0d AM |
27963 | + } else |
27964 | + iput(&icntnr->vfs_inode); | |
1facf9fc | 27965 | +} |
27966 | + | |
27967 | +/* free all plinks */ | |
e49829fe | 27968 | +void au_plink_put(struct super_block *sb, int verbose) |
1facf9fc | 27969 | +{ |
86dc4139 | 27970 | + int i, warned; |
1facf9fc | 27971 | + struct au_sbinfo *sbinfo; |
8b6a4947 AM |
27972 | + struct hlist_bl_head *hbl; |
27973 | + struct hlist_bl_node *pos, *tmp; | |
5afbbe0d | 27974 | + struct au_icntnr *icntnr; |
1facf9fc | 27975 | + |
dece6358 AM |
27976 | + SiMustWriteLock(sb); |
27977 | + | |
1facf9fc | 27978 | + sbinfo = au_sbi(sb); |
27979 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 27980 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 27981 | + |
1facf9fc | 27982 | + /* no spin_lock since sbinfo is write-locked */ |
86dc4139 AM |
27983 | + warned = 0; |
27984 | + for (i = 0; i < AuPlink_NHASH; i++) { | |
8b6a4947 AM |
27985 | + hbl = sbinfo->si_plink + i; |
27986 | + if (!warned && verbose && !hlist_bl_empty(hbl)) { | |
86dc4139 AM |
27987 | + pr_warn("pseudo-link is not flushed"); |
27988 | + warned = 1; | |
27989 | + } | |
8b6a4947 | 27990 | + hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) |
5afbbe0d | 27991 | + iput(&icntnr->vfs_inode); |
8b6a4947 | 27992 | + INIT_HLIST_BL_HEAD(hbl); |
86dc4139 | 27993 | + } |
1facf9fc | 27994 | +} |
27995 | + | |
e49829fe JR |
27996 | +void au_plink_clean(struct super_block *sb, int verbose) |
27997 | +{ | |
27998 | + struct dentry *root; | |
27999 | + | |
28000 | + root = sb->s_root; | |
28001 | + aufs_write_lock(root); | |
28002 | + if (au_opt_test(au_mntflags(sb), PLINK)) | |
28003 | + au_plink_put(sb, verbose); | |
28004 | + aufs_write_unlock(root); | |
28005 | +} | |
28006 | + | |
86dc4139 AM |
28007 | +static int au_plink_do_half_refresh(struct inode *inode, aufs_bindex_t br_id) |
28008 | +{ | |
28009 | + int do_put; | |
5afbbe0d | 28010 | + aufs_bindex_t btop, bbot, bindex; |
86dc4139 AM |
28011 | + |
28012 | + do_put = 0; | |
5afbbe0d AM |
28013 | + btop = au_ibtop(inode); |
28014 | + bbot = au_ibbot(inode); | |
28015 | + if (btop >= 0) { | |
28016 | + for (bindex = btop; bindex <= bbot; bindex++) { | |
86dc4139 AM |
28017 | + if (!au_h_iptr(inode, bindex) |
28018 | + || au_ii_br_id(inode, bindex) != br_id) | |
28019 | + continue; | |
28020 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
28021 | + do_put = 1; | |
28022 | + break; | |
28023 | + } | |
28024 | + if (do_put) | |
5afbbe0d | 28025 | + for (bindex = btop; bindex <= bbot; bindex++) |
86dc4139 AM |
28026 | + if (au_h_iptr(inode, bindex)) { |
28027 | + do_put = 0; | |
28028 | + break; | |
28029 | + } | |
28030 | + } else | |
28031 | + do_put = 1; | |
28032 | + | |
28033 | + return do_put; | |
28034 | +} | |
28035 | + | |
1facf9fc | 28036 | +/* free the plinks on a branch specified by @br_id */ |
28037 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id) | |
28038 | +{ | |
28039 | + struct au_sbinfo *sbinfo; | |
8b6a4947 AM |
28040 | + struct hlist_bl_head *hbl; |
28041 | + struct hlist_bl_node *pos, *tmp; | |
5afbbe0d | 28042 | + struct au_icntnr *icntnr; |
1facf9fc | 28043 | + struct inode *inode; |
86dc4139 | 28044 | + int i, do_put; |
1facf9fc | 28045 | + |
dece6358 AM |
28046 | + SiMustWriteLock(sb); |
28047 | + | |
1facf9fc | 28048 | + sbinfo = au_sbi(sb); |
28049 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 28050 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 28051 | + |
8b6a4947 | 28052 | + /* no bit_lock since sbinfo is write-locked */ |
86dc4139 | 28053 | + for (i = 0; i < AuPlink_NHASH; i++) { |
8b6a4947 AM |
28054 | + hbl = sbinfo->si_plink + i; |
28055 | + hlist_bl_for_each_entry_safe(icntnr, pos, tmp, hbl, plink) { | |
5afbbe0d | 28056 | + inode = au_igrab(&icntnr->vfs_inode); |
86dc4139 AM |
28057 | + ii_write_lock_child(inode); |
28058 | + do_put = au_plink_do_half_refresh(inode, br_id); | |
5afbbe0d | 28059 | + if (do_put) { |
8b6a4947 | 28060 | + hlist_bl_del(&icntnr->plink); |
5afbbe0d AM |
28061 | + iput(inode); |
28062 | + } | |
86dc4139 AM |
28063 | + ii_write_unlock(inode); |
28064 | + iput(inode); | |
dece6358 | 28065 | + } |
dece6358 AM |
28066 | + } |
28067 | +} | |
7f207e10 AM |
28068 | diff -urN /usr/share/empty/fs/aufs/poll.c linux/fs/aufs/poll.c |
28069 | --- /usr/share/empty/fs/aufs/poll.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 AM |
28070 | +++ linux/fs/aufs/poll.c 2018-08-12 23:43:05.460124736 +0200 |
28071 | @@ -0,0 +1,51 @@ | |
28072 | +// SPDX-License-Identifier: GPL-2.0 | |
dece6358 | 28073 | +/* |
b00004a5 | 28074 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
dece6358 AM |
28075 | + * |
28076 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28077 | + * it under the terms of the GNU General Public License as published by | |
28078 | + * the Free Software Foundation; either version 2 of the License, or | |
28079 | + * (at your option) any later version. | |
28080 | + * | |
28081 | + * This program is distributed in the hope that it will be useful, | |
28082 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28083 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28084 | + * GNU General Public License for more details. | |
28085 | + * | |
28086 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28087 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
dece6358 AM |
28088 | + */ |
28089 | + | |
1308ab2a | 28090 | +/* |
28091 | + * poll operation | |
28092 | + * There is only one filesystem which implements ->poll operation, currently. | |
28093 | + */ | |
28094 | + | |
28095 | +#include "aufs.h" | |
28096 | + | |
cd7a4cd9 | 28097 | +__poll_t aufs_poll(struct file *file, struct poll_table_struct *pt) |
1308ab2a | 28098 | +{ |
be118d29 | 28099 | + __poll_t mask; |
1308ab2a | 28100 | + struct file *h_file; |
1308ab2a | 28101 | + struct super_block *sb; |
28102 | + | |
28103 | + /* We should pretend an error happened. */ | |
be118d29 | 28104 | + mask = EPOLLERR /* | EPOLLIN | EPOLLOUT */; |
b912730e | 28105 | + sb = file->f_path.dentry->d_sb; |
e49829fe | 28106 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
b912730e | 28107 | + |
521ced18 | 28108 | + h_file = au_read_pre(file, /*keep_fi*/0, /*lsc*/0); |
062440b3 AM |
28109 | + if (IS_ERR(h_file)) { |
28110 | + AuDbg("h_file %ld\n", PTR_ERR(h_file)); | |
1308ab2a | 28111 | + goto out; |
062440b3 | 28112 | + } |
1308ab2a | 28113 | + |
cd7a4cd9 | 28114 | + mask = vfs_poll(h_file, pt); |
b912730e | 28115 | + fput(h_file); /* instead of au_read_post() */ |
1308ab2a | 28116 | + |
4f0767ce | 28117 | +out: |
1308ab2a | 28118 | + si_read_unlock(sb); |
062440b3 | 28119 | + if (mask & EPOLLERR) |
b00004a5 | 28120 | + AuDbg("mask 0x%x\n", mask); |
1308ab2a | 28121 | + return mask; |
28122 | +} | |
c1595e42 JR |
28123 | diff -urN /usr/share/empty/fs/aufs/posix_acl.c linux/fs/aufs/posix_acl.c |
28124 | --- /usr/share/empty/fs/aufs/posix_acl.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 28125 | +++ linux/fs/aufs/posix_acl.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 28126 | @@ -0,0 +1,103 @@ |
cd7a4cd9 | 28127 | +// SPDX-License-Identifier: GPL-2.0 |
c1595e42 | 28128 | +/* |
b00004a5 | 28129 | + * Copyright (C) 2014-2018 Junjiro R. Okajima |
c1595e42 JR |
28130 | + * |
28131 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28132 | + * it under the terms of the GNU General Public License as published by | |
28133 | + * the Free Software Foundation; either version 2 of the License, or | |
28134 | + * (at your option) any later version. | |
28135 | + * | |
28136 | + * This program is distributed in the hope that it will be useful, | |
28137 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28138 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28139 | + * GNU General Public License for more details. | |
28140 | + * | |
28141 | + * You should have received a copy of the GNU General Public License | |
28142 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
28143 | + */ | |
28144 | + | |
28145 | +/* | |
28146 | + * posix acl operations | |
28147 | + */ | |
28148 | + | |
28149 | +#include <linux/fs.h> | |
c1595e42 JR |
28150 | +#include "aufs.h" |
28151 | + | |
28152 | +struct posix_acl *aufs_get_acl(struct inode *inode, int type) | |
28153 | +{ | |
28154 | + struct posix_acl *acl; | |
28155 | + int err; | |
28156 | + aufs_bindex_t bindex; | |
28157 | + struct inode *h_inode; | |
28158 | + struct super_block *sb; | |
28159 | + | |
28160 | + acl = NULL; | |
28161 | + sb = inode->i_sb; | |
28162 | + si_read_lock(sb, AuLock_FLUSH); | |
28163 | + ii_read_lock_child(inode); | |
2121bcd9 | 28164 | + if (!(sb->s_flags & SB_POSIXACL)) |
c1595e42 JR |
28165 | + goto out; |
28166 | + | |
5afbbe0d | 28167 | + bindex = au_ibtop(inode); |
c1595e42 JR |
28168 | + h_inode = au_h_iptr(inode, bindex); |
28169 | + if (unlikely(!h_inode | |
28170 | + || ((h_inode->i_mode & S_IFMT) | |
28171 | + != (inode->i_mode & S_IFMT)))) { | |
28172 | + err = au_busy_or_stale(); | |
28173 | + acl = ERR_PTR(err); | |
28174 | + goto out; | |
28175 | + } | |
28176 | + | |
28177 | + /* always topmost only */ | |
28178 | + acl = get_acl(h_inode, type); | |
a2654f78 AM |
28179 | + if (!IS_ERR_OR_NULL(acl)) |
28180 | + set_cached_acl(inode, type, acl); | |
c1595e42 JR |
28181 | + |
28182 | +out: | |
28183 | + ii_read_unlock(inode); | |
28184 | + si_read_unlock(sb); | |
28185 | + | |
28186 | + AuTraceErrPtr(acl); | |
28187 | + return acl; | |
28188 | +} | |
28189 | + | |
28190 | +int aufs_set_acl(struct inode *inode, struct posix_acl *acl, int type) | |
28191 | +{ | |
28192 | + int err; | |
28193 | + ssize_t ssz; | |
28194 | + struct dentry *dentry; | |
f2c43d5f | 28195 | + struct au_sxattr arg = { |
c1595e42 JR |
28196 | + .type = AU_ACL_SET, |
28197 | + .u.acl_set = { | |
28198 | + .acl = acl, | |
28199 | + .type = type | |
28200 | + }, | |
28201 | + }; | |
28202 | + | |
5afbbe0d AM |
28203 | + IMustLock(inode); |
28204 | + | |
c1595e42 JR |
28205 | + if (inode->i_ino == AUFS_ROOT_INO) |
28206 | + dentry = dget(inode->i_sb->s_root); | |
28207 | + else { | |
28208 | + dentry = d_find_alias(inode); | |
28209 | + if (!dentry) | |
28210 | + dentry = d_find_any_alias(inode); | |
28211 | + if (!dentry) { | |
28212 | + pr_warn("cannot handle this inode, " | |
28213 | + "please report to aufs-users ML\n"); | |
28214 | + err = -ENOENT; | |
28215 | + goto out; | |
28216 | + } | |
28217 | + } | |
28218 | + | |
f2c43d5f | 28219 | + ssz = au_sxattr(dentry, inode, &arg); |
c1595e42 JR |
28220 | + dput(dentry); |
28221 | + err = ssz; | |
a2654f78 | 28222 | + if (ssz >= 0) { |
c1595e42 | 28223 | + err = 0; |
a2654f78 AM |
28224 | + set_cached_acl(inode, type, acl); |
28225 | + } | |
c1595e42 JR |
28226 | + |
28227 | +out: | |
c1595e42 JR |
28228 | + return err; |
28229 | +} | |
7f207e10 AM |
28230 | diff -urN /usr/share/empty/fs/aufs/procfs.c linux/fs/aufs/procfs.c |
28231 | --- /usr/share/empty/fs/aufs/procfs.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 28232 | +++ linux/fs/aufs/procfs.c 2018-08-12 23:43:05.460124736 +0200 |
062440b3 | 28233 | @@ -0,0 +1,171 @@ |
cd7a4cd9 | 28234 | +// SPDX-License-Identifier: GPL-2.0 |
e49829fe | 28235 | +/* |
b00004a5 | 28236 | + * Copyright (C) 2010-2018 Junjiro R. Okajima |
e49829fe JR |
28237 | + * |
28238 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28239 | + * it under the terms of the GNU General Public License as published by | |
28240 | + * the Free Software Foundation; either version 2 of the License, or | |
28241 | + * (at your option) any later version. | |
28242 | + * | |
28243 | + * This program is distributed in the hope that it will be useful, | |
28244 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28245 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28246 | + * GNU General Public License for more details. | |
28247 | + * | |
28248 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28249 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
e49829fe JR |
28250 | + */ |
28251 | + | |
28252 | +/* | |
28253 | + * procfs interfaces | |
28254 | + */ | |
28255 | + | |
28256 | +#include <linux/proc_fs.h> | |
28257 | +#include "aufs.h" | |
28258 | + | |
28259 | +static int au_procfs_plm_release(struct inode *inode, struct file *file) | |
28260 | +{ | |
28261 | + struct au_sbinfo *sbinfo; | |
28262 | + | |
28263 | + sbinfo = file->private_data; | |
28264 | + if (sbinfo) { | |
28265 | + au_plink_maint_leave(sbinfo); | |
28266 | + kobject_put(&sbinfo->si_kobj); | |
28267 | + } | |
28268 | + | |
28269 | + return 0; | |
28270 | +} | |
28271 | + | |
28272 | +static void au_procfs_plm_write_clean(struct file *file) | |
28273 | +{ | |
28274 | + struct au_sbinfo *sbinfo; | |
28275 | + | |
28276 | + sbinfo = file->private_data; | |
28277 | + if (sbinfo) | |
28278 | + au_plink_clean(sbinfo->si_sb, /*verbose*/0); | |
28279 | +} | |
28280 | + | |
28281 | +static int au_procfs_plm_write_si(struct file *file, unsigned long id) | |
28282 | +{ | |
28283 | + int err; | |
28284 | + struct super_block *sb; | |
28285 | + struct au_sbinfo *sbinfo; | |
8b6a4947 | 28286 | + struct hlist_bl_node *pos; |
e49829fe JR |
28287 | + |
28288 | + err = -EBUSY; | |
28289 | + if (unlikely(file->private_data)) | |
28290 | + goto out; | |
28291 | + | |
28292 | + sb = NULL; | |
53392da6 | 28293 | + /* don't use au_sbilist_lock() here */ |
8b6a4947 AM |
28294 | + hlist_bl_lock(&au_sbilist); |
28295 | + hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) | |
e49829fe JR |
28296 | + if (id == sysaufs_si_id(sbinfo)) { |
28297 | + kobject_get(&sbinfo->si_kobj); | |
28298 | + sb = sbinfo->si_sb; | |
28299 | + break; | |
28300 | + } | |
8b6a4947 | 28301 | + hlist_bl_unlock(&au_sbilist); |
e49829fe JR |
28302 | + |
28303 | + err = -EINVAL; | |
28304 | + if (unlikely(!sb)) | |
28305 | + goto out; | |
28306 | + | |
28307 | + err = au_plink_maint_enter(sb); | |
28308 | + if (!err) | |
28309 | + /* keep kobject_get() */ | |
28310 | + file->private_data = sbinfo; | |
28311 | + else | |
28312 | + kobject_put(&sbinfo->si_kobj); | |
28313 | +out: | |
28314 | + return err; | |
28315 | +} | |
28316 | + | |
28317 | +/* | |
28318 | + * Accept a valid "si=xxxx" only. | |
28319 | + * Once it is accepted successfully, accept "clean" too. | |
28320 | + */ | |
28321 | +static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf, | |
28322 | + size_t count, loff_t *ppos) | |
28323 | +{ | |
28324 | + ssize_t err; | |
28325 | + unsigned long id; | |
28326 | + /* last newline is allowed */ | |
28327 | + char buf[3 + sizeof(unsigned long) * 2 + 1]; | |
28328 | + | |
28329 | + err = -EACCES; | |
28330 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
28331 | + goto out; | |
28332 | + | |
28333 | + err = -EINVAL; | |
28334 | + if (unlikely(count > sizeof(buf))) | |
28335 | + goto out; | |
28336 | + | |
28337 | + err = copy_from_user(buf, ubuf, count); | |
28338 | + if (unlikely(err)) { | |
28339 | + err = -EFAULT; | |
28340 | + goto out; | |
28341 | + } | |
28342 | + buf[count] = 0; | |
28343 | + | |
28344 | + err = -EINVAL; | |
28345 | + if (!strcmp("clean", buf)) { | |
28346 | + au_procfs_plm_write_clean(file); | |
28347 | + goto out_success; | |
28348 | + } else if (unlikely(strncmp("si=", buf, 3))) | |
28349 | + goto out; | |
28350 | + | |
9dbd164d | 28351 | + err = kstrtoul(buf + 3, 16, &id); |
e49829fe JR |
28352 | + if (unlikely(err)) |
28353 | + goto out; | |
28354 | + | |
28355 | + err = au_procfs_plm_write_si(file, id); | |
28356 | + if (unlikely(err)) | |
28357 | + goto out; | |
28358 | + | |
28359 | +out_success: | |
28360 | + err = count; /* success */ | |
28361 | +out: | |
28362 | + return err; | |
28363 | +} | |
28364 | + | |
28365 | +static const struct file_operations au_procfs_plm_fop = { | |
28366 | + .write = au_procfs_plm_write, | |
28367 | + .release = au_procfs_plm_release, | |
28368 | + .owner = THIS_MODULE | |
28369 | +}; | |
28370 | + | |
28371 | +/* ---------------------------------------------------------------------- */ | |
28372 | + | |
28373 | +static struct proc_dir_entry *au_procfs_dir; | |
28374 | + | |
28375 | +void au_procfs_fin(void) | |
28376 | +{ | |
28377 | + remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir); | |
28378 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
28379 | +} | |
28380 | + | |
28381 | +int __init au_procfs_init(void) | |
28382 | +{ | |
28383 | + int err; | |
28384 | + struct proc_dir_entry *entry; | |
28385 | + | |
28386 | + err = -ENOMEM; | |
28387 | + au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL); | |
28388 | + if (unlikely(!au_procfs_dir)) | |
28389 | + goto out; | |
28390 | + | |
cd7a4cd9 | 28391 | + entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | 0200, |
e49829fe JR |
28392 | + au_procfs_dir, &au_procfs_plm_fop); |
28393 | + if (unlikely(!entry)) | |
28394 | + goto out_dir; | |
28395 | + | |
28396 | + err = 0; | |
28397 | + goto out; /* success */ | |
28398 | + | |
28399 | + | |
28400 | +out_dir: | |
28401 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
28402 | +out: | |
28403 | + return err; | |
28404 | +} | |
7f207e10 AM |
28405 | diff -urN /usr/share/empty/fs/aufs/rdu.c linux/fs/aufs/rdu.c |
28406 | --- /usr/share/empty/fs/aufs/rdu.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 28407 | +++ linux/fs/aufs/rdu.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 28408 | @@ -0,0 +1,382 @@ |
cd7a4cd9 | 28409 | +// SPDX-License-Identifier: GPL-2.0 |
1308ab2a | 28410 | +/* |
b00004a5 | 28411 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1308ab2a | 28412 | + * |
28413 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28414 | + * it under the terms of the GNU General Public License as published by | |
28415 | + * the Free Software Foundation; either version 2 of the License, or | |
28416 | + * (at your option) any later version. | |
28417 | + * | |
28418 | + * This program is distributed in the hope that it will be useful, | |
28419 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28420 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28421 | + * GNU General Public License for more details. | |
28422 | + * | |
28423 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28424 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1308ab2a | 28425 | + */ |
28426 | + | |
28427 | +/* | |
28428 | + * readdir in userspace. | |
28429 | + */ | |
28430 | + | |
b752ccd1 | 28431 | +#include <linux/compat.h> |
4a4d8108 | 28432 | +#include <linux/fs_stack.h> |
1308ab2a | 28433 | +#include <linux/security.h> |
1308ab2a | 28434 | +#include "aufs.h" |
28435 | + | |
28436 | +/* bits for struct aufs_rdu.flags */ | |
28437 | +#define AuRdu_CALLED 1 | |
28438 | +#define AuRdu_CONT (1 << 1) | |
28439 | +#define AuRdu_FULL (1 << 2) | |
28440 | +#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) | |
7f207e10 AM |
28441 | +#define au_fset_rdu(flags, name) \ |
28442 | + do { (flags) |= AuRdu_##name; } while (0) | |
28443 | +#define au_fclr_rdu(flags, name) \ | |
28444 | + do { (flags) &= ~AuRdu_##name; } while (0) | |
1308ab2a | 28445 | + |
28446 | +struct au_rdu_arg { | |
392086de | 28447 | + struct dir_context ctx; |
1308ab2a | 28448 | + struct aufs_rdu *rdu; |
28449 | + union au_rdu_ent_ul ent; | |
28450 | + unsigned long end; | |
28451 | + | |
28452 | + struct super_block *sb; | |
28453 | + int err; | |
28454 | +}; | |
28455 | + | |
392086de | 28456 | +static int au_rdu_fill(struct dir_context *ctx, const char *name, int nlen, |
1308ab2a | 28457 | + loff_t offset, u64 h_ino, unsigned int d_type) |
28458 | +{ | |
28459 | + int err, len; | |
392086de | 28460 | + struct au_rdu_arg *arg = container_of(ctx, struct au_rdu_arg, ctx); |
1308ab2a | 28461 | + struct aufs_rdu *rdu = arg->rdu; |
28462 | + struct au_rdu_ent ent; | |
28463 | + | |
28464 | + err = 0; | |
28465 | + arg->err = 0; | |
28466 | + au_fset_rdu(rdu->cookie.flags, CALLED); | |
28467 | + len = au_rdu_len(nlen); | |
28468 | + if (arg->ent.ul + len < arg->end) { | |
28469 | + ent.ino = h_ino; | |
28470 | + ent.bindex = rdu->cookie.bindex; | |
28471 | + ent.type = d_type; | |
28472 | + ent.nlen = nlen; | |
4a4d8108 AM |
28473 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) |
28474 | + ent.type = DT_UNKNOWN; | |
1308ab2a | 28475 | + |
9dbd164d | 28476 | + /* unnecessary to support mmap_sem since this is a dir */ |
1308ab2a | 28477 | + err = -EFAULT; |
28478 | + if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) | |
28479 | + goto out; | |
28480 | + if (copy_to_user(arg->ent.e->name, name, nlen)) | |
28481 | + goto out; | |
28482 | + /* the terminating NULL */ | |
28483 | + if (__put_user(0, arg->ent.e->name + nlen)) | |
28484 | + goto out; | |
28485 | + err = 0; | |
28486 | + /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ | |
28487 | + arg->ent.ul += len; | |
28488 | + rdu->rent++; | |
28489 | + } else { | |
28490 | + err = -EFAULT; | |
28491 | + au_fset_rdu(rdu->cookie.flags, FULL); | |
28492 | + rdu->full = 1; | |
28493 | + rdu->tail = arg->ent; | |
28494 | + } | |
28495 | + | |
4f0767ce | 28496 | +out: |
1308ab2a | 28497 | + /* AuTraceErr(err); */ |
28498 | + return err; | |
28499 | +} | |
28500 | + | |
28501 | +static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) | |
28502 | +{ | |
28503 | + int err; | |
28504 | + loff_t offset; | |
28505 | + struct au_rdu_cookie *cookie = &arg->rdu->cookie; | |
28506 | + | |
92d182d2 | 28507 | + /* we don't have to care (FMODE_32BITHASH | FMODE_64BITHASH) for ext4 */ |
1308ab2a | 28508 | + offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); |
28509 | + err = offset; | |
28510 | + if (unlikely(offset != cookie->h_pos)) | |
28511 | + goto out; | |
28512 | + | |
28513 | + err = 0; | |
28514 | + do { | |
28515 | + arg->err = 0; | |
28516 | + au_fclr_rdu(cookie->flags, CALLED); | |
28517 | + /* smp_mb(); */ | |
392086de | 28518 | + err = vfsub_iterate_dir(h_file, &arg->ctx); |
1308ab2a | 28519 | + if (err >= 0) |
28520 | + err = arg->err; | |
28521 | + } while (!err | |
28522 | + && au_ftest_rdu(cookie->flags, CALLED) | |
28523 | + && !au_ftest_rdu(cookie->flags, FULL)); | |
28524 | + cookie->h_pos = h_file->f_pos; | |
28525 | + | |
4f0767ce | 28526 | +out: |
1308ab2a | 28527 | + AuTraceErr(err); |
28528 | + return err; | |
28529 | +} | |
28530 | + | |
28531 | +static int au_rdu(struct file *file, struct aufs_rdu *rdu) | |
28532 | +{ | |
28533 | + int err; | |
5afbbe0d | 28534 | + aufs_bindex_t bbot; |
392086de AM |
28535 | + struct au_rdu_arg arg = { |
28536 | + .ctx = { | |
2000de60 | 28537 | + .actor = au_rdu_fill |
392086de AM |
28538 | + } |
28539 | + }; | |
1308ab2a | 28540 | + struct dentry *dentry; |
28541 | + struct inode *inode; | |
28542 | + struct file *h_file; | |
28543 | + struct au_rdu_cookie *cookie = &rdu->cookie; | |
28544 | + | |
28545 | + err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz); | |
28546 | + if (unlikely(err)) { | |
28547 | + err = -EFAULT; | |
28548 | + AuTraceErr(err); | |
28549 | + goto out; | |
28550 | + } | |
28551 | + rdu->rent = 0; | |
28552 | + rdu->tail = rdu->ent; | |
28553 | + rdu->full = 0; | |
28554 | + arg.rdu = rdu; | |
28555 | + arg.ent = rdu->ent; | |
28556 | + arg.end = arg.ent.ul; | |
28557 | + arg.end += rdu->sz; | |
28558 | + | |
28559 | + err = -ENOTDIR; | |
5afbbe0d | 28560 | + if (unlikely(!file->f_op->iterate && !file->f_op->iterate_shared)) |
1308ab2a | 28561 | + goto out; |
28562 | + | |
28563 | + err = security_file_permission(file, MAY_READ); | |
28564 | + AuTraceErr(err); | |
28565 | + if (unlikely(err)) | |
28566 | + goto out; | |
28567 | + | |
2000de60 | 28568 | + dentry = file->f_path.dentry; |
5527c038 | 28569 | + inode = d_inode(dentry); |
5afbbe0d | 28570 | + inode_lock_shared(inode); |
1308ab2a | 28571 | + |
28572 | + arg.sb = inode->i_sb; | |
e49829fe JR |
28573 | + err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM); |
28574 | + if (unlikely(err)) | |
28575 | + goto out_mtx; | |
027c5e7a AM |
28576 | + err = au_alive_dir(dentry); |
28577 | + if (unlikely(err)) | |
28578 | + goto out_si; | |
e49829fe | 28579 | + /* todo: reval? */ |
1308ab2a | 28580 | + fi_read_lock(file); |
28581 | + | |
28582 | + err = -EAGAIN; | |
28583 | + if (unlikely(au_ftest_rdu(cookie->flags, CONT) | |
28584 | + && cookie->generation != au_figen(file))) | |
28585 | + goto out_unlock; | |
28586 | + | |
28587 | + err = 0; | |
28588 | + if (!rdu->blk) { | |
28589 | + rdu->blk = au_sbi(arg.sb)->si_rdblk; | |
28590 | + if (!rdu->blk) | |
28591 | + rdu->blk = au_dir_size(file, /*dentry*/NULL); | |
28592 | + } | |
5afbbe0d AM |
28593 | + bbot = au_fbtop(file); |
28594 | + if (cookie->bindex < bbot) | |
28595 | + cookie->bindex = bbot; | |
28596 | + bbot = au_fbbot_dir(file); | |
28597 | + /* AuDbg("b%d, b%d\n", cookie->bindex, bbot); */ | |
28598 | + for (; !err && cookie->bindex <= bbot; | |
1308ab2a | 28599 | + cookie->bindex++, cookie->h_pos = 0) { |
4a4d8108 | 28600 | + h_file = au_hf_dir(file, cookie->bindex); |
1308ab2a | 28601 | + if (!h_file) |
28602 | + continue; | |
28603 | + | |
28604 | + au_fclr_rdu(cookie->flags, FULL); | |
28605 | + err = au_rdu_do(h_file, &arg); | |
28606 | + AuTraceErr(err); | |
28607 | + if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) | |
28608 | + break; | |
28609 | + } | |
28610 | + AuDbg("rent %llu\n", rdu->rent); | |
28611 | + | |
28612 | + if (!err && !au_ftest_rdu(cookie->flags, CONT)) { | |
28613 | + rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); | |
28614 | + au_fset_rdu(cookie->flags, CONT); | |
28615 | + cookie->generation = au_figen(file); | |
28616 | + } | |
28617 | + | |
28618 | + ii_read_lock_child(inode); | |
5afbbe0d | 28619 | + fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibtop(inode))); |
1308ab2a | 28620 | + ii_read_unlock(inode); |
28621 | + | |
4f0767ce | 28622 | +out_unlock: |
1308ab2a | 28623 | + fi_read_unlock(file); |
027c5e7a | 28624 | +out_si: |
1308ab2a | 28625 | + si_read_unlock(arg.sb); |
4f0767ce | 28626 | +out_mtx: |
5afbbe0d | 28627 | + inode_unlock_shared(inode); |
4f0767ce | 28628 | +out: |
1308ab2a | 28629 | + AuTraceErr(err); |
28630 | + return err; | |
28631 | +} | |
28632 | + | |
28633 | +static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) | |
28634 | +{ | |
28635 | + int err; | |
28636 | + ino_t ino; | |
28637 | + unsigned long long nent; | |
28638 | + union au_rdu_ent_ul *u; | |
28639 | + struct au_rdu_ent ent; | |
28640 | + struct super_block *sb; | |
28641 | + | |
28642 | + err = 0; | |
28643 | + nent = rdu->nent; | |
28644 | + u = &rdu->ent; | |
2000de60 | 28645 | + sb = file->f_path.dentry->d_sb; |
1308ab2a | 28646 | + si_read_lock(sb, AuLock_FLUSH); |
28647 | + while (nent-- > 0) { | |
9dbd164d | 28648 | + /* unnecessary to support mmap_sem since this is a dir */ |
1308ab2a | 28649 | + err = copy_from_user(&ent, u->e, sizeof(ent)); |
4a4d8108 AM |
28650 | + if (!err) |
28651 | + err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino)); | |
1308ab2a | 28652 | + if (unlikely(err)) { |
28653 | + err = -EFAULT; | |
28654 | + AuTraceErr(err); | |
28655 | + break; | |
28656 | + } | |
28657 | + | |
28658 | + /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ | |
28659 | + if (!ent.wh) | |
28660 | + err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); | |
28661 | + else | |
28662 | + err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, | |
28663 | + &ino); | |
28664 | + if (unlikely(err)) { | |
28665 | + AuTraceErr(err); | |
28666 | + break; | |
28667 | + } | |
28668 | + | |
28669 | + err = __put_user(ino, &u->e->ino); | |
28670 | + if (unlikely(err)) { | |
28671 | + err = -EFAULT; | |
28672 | + AuTraceErr(err); | |
28673 | + break; | |
28674 | + } | |
28675 | + u->ul += au_rdu_len(ent.nlen); | |
28676 | + } | |
28677 | + si_read_unlock(sb); | |
28678 | + | |
28679 | + return err; | |
28680 | +} | |
28681 | + | |
28682 | +/* ---------------------------------------------------------------------- */ | |
28683 | + | |
28684 | +static int au_rdu_verify(struct aufs_rdu *rdu) | |
28685 | +{ | |
b752ccd1 | 28686 | + AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " |
1308ab2a | 28687 | + "%llu, b%d, 0x%x, g%u}\n", |
b752ccd1 | 28688 | + rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], |
1308ab2a | 28689 | + rdu->blk, |
28690 | + rdu->rent, rdu->shwh, rdu->full, | |
28691 | + rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, | |
28692 | + rdu->cookie.generation); | |
dece6358 | 28693 | + |
b752ccd1 | 28694 | + if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) |
1308ab2a | 28695 | + return 0; |
dece6358 | 28696 | + |
b752ccd1 AM |
28697 | + AuDbg("%u:%u\n", |
28698 | + rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); | |
1308ab2a | 28699 | + return -EINVAL; |
28700 | +} | |
28701 | + | |
28702 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
dece6358 | 28703 | +{ |
1308ab2a | 28704 | + long err, e; |
28705 | + struct aufs_rdu rdu; | |
28706 | + void __user *p = (void __user *)arg; | |
dece6358 | 28707 | + |
1308ab2a | 28708 | + err = copy_from_user(&rdu, p, sizeof(rdu)); |
28709 | + if (unlikely(err)) { | |
28710 | + err = -EFAULT; | |
28711 | + AuTraceErr(err); | |
28712 | + goto out; | |
28713 | + } | |
28714 | + err = au_rdu_verify(&rdu); | |
dece6358 AM |
28715 | + if (unlikely(err)) |
28716 | + goto out; | |
28717 | + | |
1308ab2a | 28718 | + switch (cmd) { |
28719 | + case AUFS_CTL_RDU: | |
28720 | + err = au_rdu(file, &rdu); | |
28721 | + if (unlikely(err)) | |
28722 | + break; | |
dece6358 | 28723 | + |
1308ab2a | 28724 | + e = copy_to_user(p, &rdu, sizeof(rdu)); |
28725 | + if (unlikely(e)) { | |
28726 | + err = -EFAULT; | |
28727 | + AuTraceErr(err); | |
28728 | + } | |
28729 | + break; | |
28730 | + case AUFS_CTL_RDU_INO: | |
28731 | + err = au_rdu_ino(file, &rdu); | |
28732 | + break; | |
28733 | + | |
28734 | + default: | |
4a4d8108 | 28735 | + /* err = -ENOTTY; */ |
1308ab2a | 28736 | + err = -EINVAL; |
28737 | + } | |
dece6358 | 28738 | + |
4f0767ce | 28739 | +out: |
1308ab2a | 28740 | + AuTraceErr(err); |
28741 | + return err; | |
1facf9fc | 28742 | +} |
b752ccd1 AM |
28743 | + |
28744 | +#ifdef CONFIG_COMPAT | |
28745 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
28746 | +{ | |
28747 | + long err, e; | |
28748 | + struct aufs_rdu rdu; | |
28749 | + void __user *p = compat_ptr(arg); | |
28750 | + | |
28751 | + /* todo: get_user()? */ | |
28752 | + err = copy_from_user(&rdu, p, sizeof(rdu)); | |
28753 | + if (unlikely(err)) { | |
28754 | + err = -EFAULT; | |
28755 | + AuTraceErr(err); | |
28756 | + goto out; | |
28757 | + } | |
28758 | + rdu.ent.e = compat_ptr(rdu.ent.ul); | |
28759 | + err = au_rdu_verify(&rdu); | |
28760 | + if (unlikely(err)) | |
28761 | + goto out; | |
28762 | + | |
28763 | + switch (cmd) { | |
28764 | + case AUFS_CTL_RDU: | |
28765 | + err = au_rdu(file, &rdu); | |
28766 | + if (unlikely(err)) | |
28767 | + break; | |
28768 | + | |
28769 | + rdu.ent.ul = ptr_to_compat(rdu.ent.e); | |
28770 | + rdu.tail.ul = ptr_to_compat(rdu.tail.e); | |
28771 | + e = copy_to_user(p, &rdu, sizeof(rdu)); | |
28772 | + if (unlikely(e)) { | |
28773 | + err = -EFAULT; | |
28774 | + AuTraceErr(err); | |
28775 | + } | |
28776 | + break; | |
28777 | + case AUFS_CTL_RDU_INO: | |
28778 | + err = au_rdu_ino(file, &rdu); | |
28779 | + break; | |
28780 | + | |
28781 | + default: | |
28782 | + /* err = -ENOTTY; */ | |
28783 | + err = -EINVAL; | |
28784 | + } | |
28785 | + | |
4f0767ce | 28786 | +out: |
b752ccd1 AM |
28787 | + AuTraceErr(err); |
28788 | + return err; | |
28789 | +} | |
28790 | +#endif | |
7f207e10 AM |
28791 | diff -urN /usr/share/empty/fs/aufs/rwsem.h linux/fs/aufs/rwsem.h |
28792 | --- /usr/share/empty/fs/aufs/rwsem.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 28793 | +++ linux/fs/aufs/rwsem.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
28794 | @@ -0,0 +1,73 @@ |
28795 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 28796 | +/* |
b00004a5 | 28797 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 28798 | + * |
28799 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28800 | + * it under the terms of the GNU General Public License as published by | |
28801 | + * the Free Software Foundation; either version 2 of the License, or | |
28802 | + * (at your option) any later version. | |
dece6358 AM |
28803 | + * |
28804 | + * This program is distributed in the hope that it will be useful, | |
28805 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28806 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28807 | + * GNU General Public License for more details. | |
28808 | + * | |
28809 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28810 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 28811 | + */ |
28812 | + | |
28813 | +/* | |
28814 | + * simple read-write semaphore wrappers | |
28815 | + */ | |
28816 | + | |
28817 | +#ifndef __AUFS_RWSEM_H__ | |
28818 | +#define __AUFS_RWSEM_H__ | |
28819 | + | |
28820 | +#ifdef __KERNEL__ | |
28821 | + | |
4a4d8108 | 28822 | +#include "debug.h" |
dece6358 | 28823 | + |
8b6a4947 AM |
28824 | +/* in the futre, the name 'au_rwsem' will be totally gone */ |
28825 | +#define au_rwsem rw_semaphore | |
dece6358 AM |
28826 | + |
28827 | +/* to debug easier, do not make them inlined functions */ | |
8b6a4947 | 28828 | +#define AuRwMustNoWaiters(rw) AuDebugOn(rwsem_is_contended(rw)) |
dece6358 | 28829 | +/* rwsem_is_locked() is unusable */ |
8b6a4947 AM |
28830 | +#define AuRwMustReadLock(rw) AuDebugOn(!lockdep_recursing(current) \ |
28831 | + && debug_locks \ | |
28832 | + && !lockdep_is_held_type(rw, 1)) | |
28833 | +#define AuRwMustWriteLock(rw) AuDebugOn(!lockdep_recursing(current) \ | |
28834 | + && debug_locks \ | |
28835 | + && !lockdep_is_held_type(rw, 0)) | |
28836 | +#define AuRwMustAnyLock(rw) AuDebugOn(!lockdep_recursing(current) \ | |
28837 | + && debug_locks \ | |
28838 | + && !lockdep_is_held(rw)) | |
28839 | +#define AuRwDestroy(rw) AuDebugOn(!lockdep_recursing(current) \ | |
28840 | + && debug_locks \ | |
28841 | + && lockdep_is_held(rw)) | |
28842 | + | |
28843 | +#define au_rw_init(rw) init_rwsem(rw) | |
dece6358 | 28844 | + |
5afbbe0d AM |
28845 | +#define au_rw_init_wlock(rw) do { \ |
28846 | + au_rw_init(rw); \ | |
8b6a4947 | 28847 | + down_write(rw); \ |
5afbbe0d | 28848 | + } while (0) |
dece6358 | 28849 | + |
8b6a4947 AM |
28850 | +#define au_rw_init_wlock_nested(rw, lsc) do { \ |
28851 | + au_rw_init(rw); \ | |
28852 | + down_write_nested(rw, lsc); \ | |
5afbbe0d | 28853 | + } while (0) |
dece6358 | 28854 | + |
8b6a4947 AM |
28855 | +#define au_rw_read_lock(rw) down_read(rw) |
28856 | +#define au_rw_read_lock_nested(rw, lsc) down_read_nested(rw, lsc) | |
28857 | +#define au_rw_read_unlock(rw) up_read(rw) | |
28858 | +#define au_rw_dgrade_lock(rw) downgrade_write(rw) | |
28859 | +#define au_rw_write_lock(rw) down_write(rw) | |
28860 | +#define au_rw_write_lock_nested(rw, lsc) down_write_nested(rw, lsc) | |
28861 | +#define au_rw_write_unlock(rw) up_write(rw) | |
28862 | +/* why is not _nested version defined? */ | |
28863 | +#define au_rw_read_trylock(rw) down_read_trylock(rw) | |
28864 | +#define au_rw_write_trylock(rw) down_write_trylock(rw) | |
1facf9fc | 28865 | + |
28866 | +#endif /* __KERNEL__ */ | |
28867 | +#endif /* __AUFS_RWSEM_H__ */ | |
7f207e10 AM |
28868 | diff -urN /usr/share/empty/fs/aufs/sbinfo.c linux/fs/aufs/sbinfo.c |
28869 | --- /usr/share/empty/fs/aufs/sbinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 28870 | +++ linux/fs/aufs/sbinfo.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 28871 | @@ -0,0 +1,312 @@ |
cd7a4cd9 | 28872 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 28873 | +/* |
b00004a5 | 28874 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 28875 | + * |
28876 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28877 | + * it under the terms of the GNU General Public License as published by | |
28878 | + * the Free Software Foundation; either version 2 of the License, or | |
28879 | + * (at your option) any later version. | |
dece6358 AM |
28880 | + * |
28881 | + * This program is distributed in the hope that it will be useful, | |
28882 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28883 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28884 | + * GNU General Public License for more details. | |
28885 | + * | |
28886 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 28887 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 28888 | + */ |
28889 | + | |
28890 | +/* | |
28891 | + * superblock private data | |
28892 | + */ | |
28893 | + | |
28894 | +#include "aufs.h" | |
28895 | + | |
28896 | +/* | |
28897 | + * they are necessary regardless sysfs is disabled. | |
28898 | + */ | |
28899 | +void au_si_free(struct kobject *kobj) | |
28900 | +{ | |
86dc4139 | 28901 | + int i; |
1facf9fc | 28902 | + struct au_sbinfo *sbinfo; |
b752ccd1 | 28903 | + char *locked __maybe_unused; /* debug only */ |
1facf9fc | 28904 | + |
28905 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
86dc4139 | 28906 | + for (i = 0; i < AuPlink_NHASH; i++) |
8b6a4947 | 28907 | + AuDebugOn(!hlist_bl_empty(sbinfo->si_plink + i)); |
f0c0a007 | 28908 | + AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len)); |
5afbbe0d AM |
28909 | + |
28910 | + AuDebugOn(percpu_counter_sum(&sbinfo->si_ninodes)); | |
28911 | + percpu_counter_destroy(&sbinfo->si_ninodes); | |
28912 | + AuDebugOn(percpu_counter_sum(&sbinfo->si_nfiles)); | |
28913 | + percpu_counter_destroy(&sbinfo->si_nfiles); | |
1facf9fc | 28914 | + |
062440b3 | 28915 | + dbgaufs_si_fin(sbinfo); |
e49829fe | 28916 | + au_rw_write_lock(&sbinfo->si_rwsem); |
1facf9fc | 28917 | + au_br_free(sbinfo); |
e49829fe | 28918 | + au_rw_write_unlock(&sbinfo->si_rwsem); |
b752ccd1 | 28919 | + |
1c60b727 | 28920 | + kfree(sbinfo->si_branch); |
1facf9fc | 28921 | + mutex_destroy(&sbinfo->si_xib_mtx); |
dece6358 | 28922 | + AuRwDestroy(&sbinfo->si_rwsem); |
1facf9fc | 28923 | + |
1c60b727 | 28924 | + kfree(sbinfo); |
1facf9fc | 28925 | +} |
28926 | + | |
28927 | +int au_si_alloc(struct super_block *sb) | |
28928 | +{ | |
86dc4139 | 28929 | + int err, i; |
1facf9fc | 28930 | + struct au_sbinfo *sbinfo; |
28931 | + | |
28932 | + err = -ENOMEM; | |
4a4d8108 | 28933 | + sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS); |
1facf9fc | 28934 | + if (unlikely(!sbinfo)) |
28935 | + goto out; | |
28936 | + | |
28937 | + /* will be reallocated separately */ | |
28938 | + sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS); | |
28939 | + if (unlikely(!sbinfo->si_branch)) | |
febd17d6 | 28940 | + goto out_sbinfo; |
1facf9fc | 28941 | + |
1facf9fc | 28942 | + err = sysaufs_si_init(sbinfo); |
062440b3 AM |
28943 | + if (!err) { |
28944 | + dbgaufs_si_null(sbinfo); | |
28945 | + err = dbgaufs_si_init(sbinfo); | |
28946 | + if (unlikely(err)) | |
28947 | + kobject_put(&sbinfo->si_kobj); | |
28948 | + } | |
1facf9fc | 28949 | + if (unlikely(err)) |
28950 | + goto out_br; | |
28951 | + | |
28952 | + au_nwt_init(&sbinfo->si_nowait); | |
dece6358 | 28953 | + au_rw_init_wlock(&sbinfo->si_rwsem); |
b752ccd1 | 28954 | + |
5afbbe0d AM |
28955 | + percpu_counter_init(&sbinfo->si_ninodes, 0, GFP_NOFS); |
28956 | + percpu_counter_init(&sbinfo->si_nfiles, 0, GFP_NOFS); | |
7f207e10 | 28957 | + |
5afbbe0d | 28958 | + sbinfo->si_bbot = -1; |
392086de | 28959 | + sbinfo->si_last_br_id = AUFS_BRANCH_MAX / 2; |
1facf9fc | 28960 | + |
28961 | + sbinfo->si_wbr_copyup = AuWbrCopyup_Def; | |
28962 | + sbinfo->si_wbr_create = AuWbrCreate_Def; | |
4a4d8108 AM |
28963 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup; |
28964 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create; | |
1facf9fc | 28965 | + |
076b876e AM |
28966 | + au_fhsm_init(sbinfo); |
28967 | + | |
e49829fe | 28968 | + sbinfo->si_mntflags = au_opts_plink(AuOpt_Def); |
1facf9fc | 28969 | + |
392086de AM |
28970 | + sbinfo->si_xino_jiffy = jiffies; |
28971 | + sbinfo->si_xino_expire | |
28972 | + = msecs_to_jiffies(AUFS_XINO_DEF_SEC * MSEC_PER_SEC); | |
1facf9fc | 28973 | + mutex_init(&sbinfo->si_xib_mtx); |
1facf9fc | 28974 | + sbinfo->si_xino_brid = -1; |
28975 | + /* leave si_xib_last_pindex and si_xib_next_bit */ | |
28976 | + | |
8b6a4947 | 28977 | + INIT_HLIST_BL_HEAD(&sbinfo->si_aopen); |
b912730e | 28978 | + |
e49829fe | 28979 | + sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC); |
1facf9fc | 28980 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; |
28981 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
28982 | + sbinfo->si_dirwh = AUFS_DIRWH_DEF; | |
28983 | + | |
86dc4139 | 28984 | + for (i = 0; i < AuPlink_NHASH; i++) |
8b6a4947 | 28985 | + INIT_HLIST_BL_HEAD(sbinfo->si_plink + i); |
1facf9fc | 28986 | + init_waitqueue_head(&sbinfo->si_plink_wq); |
4a4d8108 | 28987 | + spin_lock_init(&sbinfo->si_plink_maint_lock); |
1facf9fc | 28988 | + |
8b6a4947 | 28989 | + INIT_HLIST_BL_HEAD(&sbinfo->si_files); |
523b37e3 | 28990 | + |
b95c5147 AM |
28991 | + /* with getattr by default */ |
28992 | + sbinfo->si_iop_array = aufs_iop; | |
28993 | + | |
1facf9fc | 28994 | + /* leave other members for sysaufs and si_mnt. */ |
28995 | + sbinfo->si_sb = sb; | |
28996 | + sb->s_fs_info = sbinfo; | |
b752ccd1 | 28997 | + si_pid_set(sb); |
1facf9fc | 28998 | + return 0; /* success */ |
28999 | + | |
4f0767ce | 29000 | +out_br: |
1c60b727 | 29001 | + kfree(sbinfo->si_branch); |
4f0767ce | 29002 | +out_sbinfo: |
1c60b727 | 29003 | + kfree(sbinfo); |
4f0767ce | 29004 | +out: |
1facf9fc | 29005 | + return err; |
29006 | +} | |
29007 | + | |
e2f27e51 | 29008 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink) |
1facf9fc | 29009 | +{ |
29010 | + int err, sz; | |
29011 | + struct au_branch **brp; | |
29012 | + | |
dece6358 AM |
29013 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
29014 | + | |
1facf9fc | 29015 | + err = -ENOMEM; |
5afbbe0d | 29016 | + sz = sizeof(*brp) * (sbinfo->si_bbot + 1); |
1facf9fc | 29017 | + if (unlikely(!sz)) |
29018 | + sz = sizeof(*brp); | |
e2f27e51 AM |
29019 | + brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS, |
29020 | + may_shrink); | |
1facf9fc | 29021 | + if (brp) { |
29022 | + sbinfo->si_branch = brp; | |
29023 | + err = 0; | |
29024 | + } | |
29025 | + | |
29026 | + return err; | |
29027 | +} | |
29028 | + | |
29029 | +/* ---------------------------------------------------------------------- */ | |
29030 | + | |
29031 | +unsigned int au_sigen_inc(struct super_block *sb) | |
29032 | +{ | |
29033 | + unsigned int gen; | |
5527c038 | 29034 | + struct inode *inode; |
1facf9fc | 29035 | + |
dece6358 AM |
29036 | + SiMustWriteLock(sb); |
29037 | + | |
1facf9fc | 29038 | + gen = ++au_sbi(sb)->si_generation; |
29039 | + au_update_digen(sb->s_root); | |
5527c038 JR |
29040 | + inode = d_inode(sb->s_root); |
29041 | + au_update_iigen(inode, /*half*/0); | |
be118d29 | 29042 | + inode_inc_iversion(inode); |
1facf9fc | 29043 | + return gen; |
29044 | +} | |
29045 | + | |
29046 | +aufs_bindex_t au_new_br_id(struct super_block *sb) | |
29047 | +{ | |
29048 | + aufs_bindex_t br_id; | |
29049 | + int i; | |
29050 | + struct au_sbinfo *sbinfo; | |
29051 | + | |
dece6358 AM |
29052 | + SiMustWriteLock(sb); |
29053 | + | |
1facf9fc | 29054 | + sbinfo = au_sbi(sb); |
29055 | + for (i = 0; i <= AUFS_BRANCH_MAX; i++) { | |
29056 | + br_id = ++sbinfo->si_last_br_id; | |
7f207e10 | 29057 | + AuDebugOn(br_id < 0); |
1facf9fc | 29058 | + if (br_id && au_br_index(sb, br_id) < 0) |
29059 | + return br_id; | |
29060 | + } | |
29061 | + | |
29062 | + return -1; | |
29063 | +} | |
29064 | + | |
29065 | +/* ---------------------------------------------------------------------- */ | |
29066 | + | |
e49829fe JR |
29067 | +/* it is ok that new 'nwt' tasks are appended while we are sleeping */ |
29068 | +int si_read_lock(struct super_block *sb, int flags) | |
29069 | +{ | |
29070 | + int err; | |
29071 | + | |
29072 | + err = 0; | |
29073 | + if (au_ftest_lock(flags, FLUSH)) | |
29074 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
29075 | + | |
29076 | + si_noflush_read_lock(sb); | |
29077 | + err = au_plink_maint(sb, flags); | |
29078 | + if (unlikely(err)) | |
29079 | + si_read_unlock(sb); | |
29080 | + | |
29081 | + return err; | |
29082 | +} | |
29083 | + | |
29084 | +int si_write_lock(struct super_block *sb, int flags) | |
29085 | +{ | |
29086 | + int err; | |
29087 | + | |
29088 | + if (au_ftest_lock(flags, FLUSH)) | |
29089 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
29090 | + | |
29091 | + si_noflush_write_lock(sb); | |
29092 | + err = au_plink_maint(sb, flags); | |
29093 | + if (unlikely(err)) | |
29094 | + si_write_unlock(sb); | |
29095 | + | |
29096 | + return err; | |
29097 | +} | |
29098 | + | |
1facf9fc | 29099 | +/* dentry and super_block lock. call at entry point */ |
e49829fe | 29100 | +int aufs_read_lock(struct dentry *dentry, int flags) |
1facf9fc | 29101 | +{ |
e49829fe | 29102 | + int err; |
027c5e7a | 29103 | + struct super_block *sb; |
e49829fe | 29104 | + |
027c5e7a AM |
29105 | + sb = dentry->d_sb; |
29106 | + err = si_read_lock(sb, flags); | |
29107 | + if (unlikely(err)) | |
29108 | + goto out; | |
29109 | + | |
29110 | + if (au_ftest_lock(flags, DW)) | |
29111 | + di_write_lock_child(dentry); | |
29112 | + else | |
29113 | + di_read_lock_child(dentry, flags); | |
29114 | + | |
29115 | + if (au_ftest_lock(flags, GEN)) { | |
29116 | + err = au_digen_test(dentry, au_sigen(sb)); | |
79b8bda9 AM |
29117 | + if (!au_opt_test(au_mntflags(sb), UDBA_NONE)) |
29118 | + AuDebugOn(!err && au_dbrange_test(dentry)); | |
29119 | + else if (!err) | |
29120 | + err = au_dbrange_test(dentry); | |
027c5e7a AM |
29121 | + if (unlikely(err)) |
29122 | + aufs_read_unlock(dentry, flags); | |
e49829fe JR |
29123 | + } |
29124 | + | |
027c5e7a | 29125 | +out: |
e49829fe | 29126 | + return err; |
1facf9fc | 29127 | +} |
29128 | + | |
29129 | +void aufs_read_unlock(struct dentry *dentry, int flags) | |
29130 | +{ | |
29131 | + if (au_ftest_lock(flags, DW)) | |
29132 | + di_write_unlock(dentry); | |
29133 | + else | |
29134 | + di_read_unlock(dentry, flags); | |
29135 | + si_read_unlock(dentry->d_sb); | |
29136 | +} | |
29137 | + | |
29138 | +void aufs_write_lock(struct dentry *dentry) | |
29139 | +{ | |
e49829fe | 29140 | + si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW); |
1facf9fc | 29141 | + di_write_lock_child(dentry); |
29142 | +} | |
29143 | + | |
29144 | +void aufs_write_unlock(struct dentry *dentry) | |
29145 | +{ | |
29146 | + di_write_unlock(dentry); | |
29147 | + si_write_unlock(dentry->d_sb); | |
29148 | +} | |
29149 | + | |
e49829fe | 29150 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags) |
1facf9fc | 29151 | +{ |
e49829fe | 29152 | + int err; |
027c5e7a AM |
29153 | + unsigned int sigen; |
29154 | + struct super_block *sb; | |
e49829fe | 29155 | + |
027c5e7a AM |
29156 | + sb = d1->d_sb; |
29157 | + err = si_read_lock(sb, flags); | |
29158 | + if (unlikely(err)) | |
29159 | + goto out; | |
29160 | + | |
b95c5147 | 29161 | + di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIRS)); |
027c5e7a AM |
29162 | + |
29163 | + if (au_ftest_lock(flags, GEN)) { | |
29164 | + sigen = au_sigen(sb); | |
29165 | + err = au_digen_test(d1, sigen); | |
29166 | + AuDebugOn(!err && au_dbrange_test(d1)); | |
29167 | + if (!err) { | |
29168 | + err = au_digen_test(d2, sigen); | |
29169 | + AuDebugOn(!err && au_dbrange_test(d2)); | |
29170 | + } | |
29171 | + if (unlikely(err)) | |
29172 | + aufs_read_and_write_unlock2(d1, d2); | |
29173 | + } | |
29174 | + | |
29175 | +out: | |
e49829fe | 29176 | + return err; |
1facf9fc | 29177 | +} |
29178 | + | |
29179 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2) | |
29180 | +{ | |
29181 | + di_write_unlock2(d1, d2); | |
29182 | + si_read_unlock(d1->d_sb); | |
29183 | +} | |
7f207e10 AM |
29184 | diff -urN /usr/share/empty/fs/aufs/super.c linux/fs/aufs/super.c |
29185 | --- /usr/share/empty/fs/aufs/super.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 29186 | +++ linux/fs/aufs/super.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 29187 | @@ -0,0 +1,1043 @@ |
cd7a4cd9 | 29188 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 29189 | +/* |
b00004a5 | 29190 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 29191 | + * |
29192 | + * This program, aufs is free software; you can redistribute it and/or modify | |
29193 | + * it under the terms of the GNU General Public License as published by | |
29194 | + * the Free Software Foundation; either version 2 of the License, or | |
29195 | + * (at your option) any later version. | |
dece6358 AM |
29196 | + * |
29197 | + * This program is distributed in the hope that it will be useful, | |
29198 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
29199 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
29200 | + * GNU General Public License for more details. | |
29201 | + * | |
29202 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 29203 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 29204 | + */ |
29205 | + | |
29206 | +/* | |
29207 | + * mount and super_block operations | |
29208 | + */ | |
29209 | + | |
f6c5ef8b | 29210 | +#include <linux/mm.h> |
1facf9fc | 29211 | +#include <linux/seq_file.h> |
29212 | +#include <linux/statfs.h> | |
7f207e10 | 29213 | +#include <linux/vmalloc.h> |
1facf9fc | 29214 | +#include "aufs.h" |
29215 | + | |
29216 | +/* | |
29217 | + * super_operations | |
29218 | + */ | |
29219 | +static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused) | |
29220 | +{ | |
29221 | + struct au_icntnr *c; | |
29222 | + | |
29223 | + c = au_cache_alloc_icntnr(); | |
29224 | + if (c) { | |
027c5e7a | 29225 | + au_icntnr_init(c); |
be118d29 | 29226 | + inode_set_iversion(&c->vfs_inode, 1); /* sigen(sb); */ |
1facf9fc | 29227 | + c->iinfo.ii_hinode = NULL; |
29228 | + return &c->vfs_inode; | |
29229 | + } | |
29230 | + return NULL; | |
29231 | +} | |
29232 | + | |
027c5e7a AM |
29233 | +static void aufs_destroy_inode_cb(struct rcu_head *head) |
29234 | +{ | |
29235 | + struct inode *inode = container_of(head, struct inode, i_rcu); | |
29236 | + | |
1c60b727 | 29237 | + au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode)); |
027c5e7a AM |
29238 | +} |
29239 | + | |
1facf9fc | 29240 | +static void aufs_destroy_inode(struct inode *inode) |
29241 | +{ | |
5afbbe0d AM |
29242 | + if (!au_is_bad_inode(inode)) |
29243 | + au_iinfo_fin(inode); | |
027c5e7a | 29244 | + call_rcu(&inode->i_rcu, aufs_destroy_inode_cb); |
1facf9fc | 29245 | +} |
29246 | + | |
29247 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino) | |
29248 | +{ | |
29249 | + struct inode *inode; | |
29250 | + int err; | |
29251 | + | |
29252 | + inode = iget_locked(sb, ino); | |
29253 | + if (unlikely(!inode)) { | |
29254 | + inode = ERR_PTR(-ENOMEM); | |
29255 | + goto out; | |
29256 | + } | |
29257 | + if (!(inode->i_state & I_NEW)) | |
29258 | + goto out; | |
29259 | + | |
29260 | + err = au_xigen_new(inode); | |
29261 | + if (!err) | |
29262 | + err = au_iinfo_init(inode); | |
29263 | + if (!err) | |
be118d29 | 29264 | + inode_inc_iversion(inode); |
1facf9fc | 29265 | + else { |
29266 | + iget_failed(inode); | |
29267 | + inode = ERR_PTR(err); | |
29268 | + } | |
29269 | + | |
4f0767ce | 29270 | +out: |
1facf9fc | 29271 | + /* never return NULL */ |
29272 | + AuDebugOn(!inode); | |
29273 | + AuTraceErrPtr(inode); | |
29274 | + return inode; | |
29275 | +} | |
29276 | + | |
29277 | +/* lock free root dinfo */ | |
29278 | +static int au_show_brs(struct seq_file *seq, struct super_block *sb) | |
29279 | +{ | |
29280 | + int err; | |
5afbbe0d | 29281 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 29282 | + struct path path; |
4a4d8108 | 29283 | + struct au_hdentry *hdp; |
1facf9fc | 29284 | + struct au_branch *br; |
076b876e | 29285 | + au_br_perm_str_t perm; |
1facf9fc | 29286 | + |
29287 | + err = 0; | |
5afbbe0d AM |
29288 | + bbot = au_sbbot(sb); |
29289 | + bindex = 0; | |
29290 | + hdp = au_hdentry(au_di(sb->s_root), bindex); | |
29291 | + for (; !err && bindex <= bbot; bindex++, hdp++) { | |
1facf9fc | 29292 | + br = au_sbr(sb, bindex); |
86dc4139 | 29293 | + path.mnt = au_br_mnt(br); |
5afbbe0d | 29294 | + path.dentry = hdp->hd_dentry; |
1facf9fc | 29295 | + err = au_seq_path(seq, &path); |
79b8bda9 | 29296 | + if (!err) { |
076b876e | 29297 | + au_optstr_br_perm(&perm, br->br_perm); |
79b8bda9 | 29298 | + seq_printf(seq, "=%s", perm.a); |
5afbbe0d | 29299 | + if (bindex != bbot) |
79b8bda9 | 29300 | + seq_putc(seq, ':'); |
1e00d052 | 29301 | + } |
1facf9fc | 29302 | + } |
79b8bda9 AM |
29303 | + if (unlikely(err || seq_has_overflowed(seq))) |
29304 | + err = -E2BIG; | |
1facf9fc | 29305 | + |
29306 | + return err; | |
29307 | +} | |
29308 | + | |
f2c43d5f AM |
29309 | +static void au_gen_fmt(char *fmt, int len __maybe_unused, const char *pat, |
29310 | + const char *append) | |
29311 | +{ | |
29312 | + char *p; | |
29313 | + | |
29314 | + p = fmt; | |
29315 | + while (*pat != ':') | |
29316 | + *p++ = *pat++; | |
29317 | + *p++ = *pat++; | |
29318 | + strcpy(p, append); | |
29319 | + AuDebugOn(strlen(fmt) >= len); | |
29320 | +} | |
29321 | + | |
1facf9fc | 29322 | +static void au_show_wbr_create(struct seq_file *m, int v, |
29323 | + struct au_sbinfo *sbinfo) | |
29324 | +{ | |
29325 | + const char *pat; | |
f2c43d5f AM |
29326 | + char fmt[32]; |
29327 | + struct au_wbr_mfs *mfs; | |
1facf9fc | 29328 | + |
dece6358 AM |
29329 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
29330 | + | |
c2b27bf2 | 29331 | + seq_puts(m, ",create="); |
1facf9fc | 29332 | + pat = au_optstr_wbr_create(v); |
f2c43d5f | 29333 | + mfs = &sbinfo->si_wbr_mfs; |
1facf9fc | 29334 | + switch (v) { |
29335 | + case AuWbrCreate_TDP: | |
29336 | + case AuWbrCreate_RR: | |
29337 | + case AuWbrCreate_MFS: | |
29338 | + case AuWbrCreate_PMFS: | |
c2b27bf2 | 29339 | + seq_puts(m, pat); |
1facf9fc | 29340 | + break; |
f2c43d5f AM |
29341 | + case AuWbrCreate_MFSRR: |
29342 | + case AuWbrCreate_TDMFS: | |
29343 | + case AuWbrCreate_PMFSRR: | |
29344 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%llu"); | |
29345 | + seq_printf(m, fmt, mfs->mfsrr_watermark); | |
1facf9fc | 29346 | + break; |
f2c43d5f | 29347 | + case AuWbrCreate_MFSV: |
1facf9fc | 29348 | + case AuWbrCreate_PMFSV: |
f2c43d5f AM |
29349 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%lu"); |
29350 | + seq_printf(m, fmt, | |
29351 | + jiffies_to_msecs(mfs->mfs_expire) | |
e49829fe | 29352 | + / MSEC_PER_SEC); |
1facf9fc | 29353 | + break; |
1facf9fc | 29354 | + case AuWbrCreate_MFSRRV: |
f2c43d5f | 29355 | + case AuWbrCreate_TDMFSV: |
392086de | 29356 | + case AuWbrCreate_PMFSRRV: |
f2c43d5f AM |
29357 | + au_gen_fmt(fmt, sizeof(fmt), pat, "%llu:%lu"); |
29358 | + seq_printf(m, fmt, mfs->mfsrr_watermark, | |
29359 | + jiffies_to_msecs(mfs->mfs_expire) / MSEC_PER_SEC); | |
392086de | 29360 | + break; |
f2c43d5f AM |
29361 | + default: |
29362 | + BUG(); | |
1facf9fc | 29363 | + } |
29364 | +} | |
29365 | + | |
7eafdf33 | 29366 | +static int au_show_xino(struct seq_file *seq, struct super_block *sb) |
1facf9fc | 29367 | +{ |
29368 | +#ifdef CONFIG_SYSFS | |
29369 | + return 0; | |
29370 | +#else | |
29371 | + int err; | |
29372 | + const int len = sizeof(AUFS_XINO_FNAME) - 1; | |
29373 | + aufs_bindex_t bindex, brid; | |
1facf9fc | 29374 | + struct qstr *name; |
29375 | + struct file *f; | |
29376 | + struct dentry *d, *h_root; | |
29377 | + | |
dece6358 AM |
29378 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
29379 | + | |
1facf9fc | 29380 | + err = 0; |
1facf9fc | 29381 | + f = au_sbi(sb)->si_xib; |
29382 | + if (!f) | |
29383 | + goto out; | |
29384 | + | |
29385 | + /* stop printing the default xino path on the first writable branch */ | |
29386 | + h_root = NULL; | |
29387 | + brid = au_xino_brid(sb); | |
29388 | + if (brid >= 0) { | |
29389 | + bindex = au_br_index(sb, brid); | |
5afbbe0d | 29390 | + h_root = au_hdentry(au_di(sb->s_root), bindex)->hd_dentry; |
1facf9fc | 29391 | + } |
2000de60 | 29392 | + d = f->f_path.dentry; |
1facf9fc | 29393 | + name = &d->d_name; |
29394 | + /* safe ->d_parent because the file is unlinked */ | |
29395 | + if (d->d_parent == h_root | |
29396 | + && name->len == len | |
29397 | + && !memcmp(name->name, AUFS_XINO_FNAME, len)) | |
29398 | + goto out; | |
29399 | + | |
29400 | + seq_puts(seq, ",xino="); | |
29401 | + err = au_xino_path(seq, f); | |
29402 | + | |
4f0767ce | 29403 | +out: |
1facf9fc | 29404 | + return err; |
29405 | +#endif | |
29406 | +} | |
29407 | + | |
29408 | +/* seq_file will re-call me in case of too long string */ | |
7eafdf33 | 29409 | +static int aufs_show_options(struct seq_file *m, struct dentry *dentry) |
1facf9fc | 29410 | +{ |
027c5e7a | 29411 | + int err; |
1facf9fc | 29412 | + unsigned int mnt_flags, v; |
29413 | + struct super_block *sb; | |
29414 | + struct au_sbinfo *sbinfo; | |
29415 | + | |
29416 | +#define AuBool(name, str) do { \ | |
29417 | + v = au_opt_test(mnt_flags, name); \ | |
29418 | + if (v != au_opt_test(AuOpt_Def, name)) \ | |
29419 | + seq_printf(m, ",%s" #str, v ? "" : "no"); \ | |
29420 | +} while (0) | |
29421 | + | |
29422 | +#define AuStr(name, str) do { \ | |
29423 | + v = mnt_flags & AuOptMask_##name; \ | |
29424 | + if (v != (AuOpt_Def & AuOptMask_##name)) \ | |
29425 | + seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \ | |
29426 | +} while (0) | |
29427 | + | |
29428 | +#define AuUInt(name, str, val) do { \ | |
29429 | + if (val != AUFS_##name##_DEF) \ | |
29430 | + seq_printf(m, "," #str "=%u", val); \ | |
29431 | +} while (0) | |
29432 | + | |
7eafdf33 | 29433 | + sb = dentry->d_sb; |
2121bcd9 | 29434 | + if (sb->s_flags & SB_POSIXACL) |
c1595e42 | 29435 | + seq_puts(m, ",acl"); |
be118d29 JR |
29436 | +#if 0 |
29437 | + if (sb->s_flags & SB_I_VERSION) | |
29438 | + seq_puts(m, ",i_version"); | |
29439 | +#endif | |
c1595e42 JR |
29440 | + |
29441 | + /* lock free root dinfo */ | |
1facf9fc | 29442 | + si_noflush_read_lock(sb); |
29443 | + sbinfo = au_sbi(sb); | |
29444 | + seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo)); | |
29445 | + | |
29446 | + mnt_flags = au_mntflags(sb); | |
29447 | + if (au_opt_test(mnt_flags, XINO)) { | |
7eafdf33 | 29448 | + err = au_show_xino(m, sb); |
1facf9fc | 29449 | + if (unlikely(err)) |
29450 | + goto out; | |
29451 | + } else | |
29452 | + seq_puts(m, ",noxino"); | |
29453 | + | |
29454 | + AuBool(TRUNC_XINO, trunc_xino); | |
29455 | + AuStr(UDBA, udba); | |
dece6358 | 29456 | + AuBool(SHWH, shwh); |
1facf9fc | 29457 | + AuBool(PLINK, plink); |
4a4d8108 | 29458 | + AuBool(DIO, dio); |
076b876e | 29459 | + AuBool(DIRPERM1, dirperm1); |
1facf9fc | 29460 | + |
29461 | + v = sbinfo->si_wbr_create; | |
29462 | + if (v != AuWbrCreate_Def) | |
29463 | + au_show_wbr_create(m, v, sbinfo); | |
29464 | + | |
29465 | + v = sbinfo->si_wbr_copyup; | |
29466 | + if (v != AuWbrCopyup_Def) | |
29467 | + seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v)); | |
29468 | + | |
29469 | + v = au_opt_test(mnt_flags, ALWAYS_DIROPQ); | |
29470 | + if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ)) | |
29471 | + seq_printf(m, ",diropq=%c", v ? 'a' : 'w'); | |
29472 | + | |
29473 | + AuUInt(DIRWH, dirwh, sbinfo->si_dirwh); | |
29474 | + | |
027c5e7a AM |
29475 | + v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC; |
29476 | + AuUInt(RDCACHE, rdcache, v); | |
1facf9fc | 29477 | + |
29478 | + AuUInt(RDBLK, rdblk, sbinfo->si_rdblk); | |
29479 | + AuUInt(RDHASH, rdhash, sbinfo->si_rdhash); | |
29480 | + | |
076b876e AM |
29481 | + au_fhsm_show(m, sbinfo); |
29482 | + | |
8b6a4947 | 29483 | + AuBool(DIRREN, dirren); |
1facf9fc | 29484 | + AuBool(SUM, sum); |
29485 | + /* AuBool(SUM_W, wsum); */ | |
29486 | + AuBool(WARN_PERM, warn_perm); | |
29487 | + AuBool(VERBOSE, verbose); | |
29488 | + | |
4f0767ce | 29489 | +out: |
1facf9fc | 29490 | + /* be sure to print "br:" last */ |
29491 | + if (!sysaufs_brs) { | |
29492 | + seq_puts(m, ",br:"); | |
29493 | + au_show_brs(m, sb); | |
29494 | + } | |
29495 | + si_read_unlock(sb); | |
29496 | + return 0; | |
29497 | + | |
1facf9fc | 29498 | +#undef AuBool |
29499 | +#undef AuStr | |
4a4d8108 | 29500 | +#undef AuUInt |
1facf9fc | 29501 | +} |
29502 | + | |
29503 | +/* ---------------------------------------------------------------------- */ | |
29504 | + | |
29505 | +/* sum mode which returns the summation for statfs(2) */ | |
29506 | + | |
29507 | +static u64 au_add_till_max(u64 a, u64 b) | |
29508 | +{ | |
29509 | + u64 old; | |
29510 | + | |
29511 | + old = a; | |
29512 | + a += b; | |
92d182d2 AM |
29513 | + if (old <= a) |
29514 | + return a; | |
29515 | + return ULLONG_MAX; | |
29516 | +} | |
29517 | + | |
29518 | +static u64 au_mul_till_max(u64 a, long mul) | |
29519 | +{ | |
29520 | + u64 old; | |
29521 | + | |
29522 | + old = a; | |
29523 | + a *= mul; | |
29524 | + if (old <= a) | |
1facf9fc | 29525 | + return a; |
29526 | + return ULLONG_MAX; | |
29527 | +} | |
29528 | + | |
29529 | +static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf) | |
29530 | +{ | |
29531 | + int err; | |
92d182d2 | 29532 | + long bsize, factor; |
1facf9fc | 29533 | + u64 blocks, bfree, bavail, files, ffree; |
5afbbe0d | 29534 | + aufs_bindex_t bbot, bindex, i; |
1facf9fc | 29535 | + unsigned char shared; |
7f207e10 | 29536 | + struct path h_path; |
1facf9fc | 29537 | + struct super_block *h_sb; |
29538 | + | |
92d182d2 AM |
29539 | + err = 0; |
29540 | + bsize = LONG_MAX; | |
29541 | + files = 0; | |
29542 | + ffree = 0; | |
1facf9fc | 29543 | + blocks = 0; |
29544 | + bfree = 0; | |
29545 | + bavail = 0; | |
5afbbe0d AM |
29546 | + bbot = au_sbbot(sb); |
29547 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
7f207e10 AM |
29548 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
29549 | + h_sb = h_path.mnt->mnt_sb; | |
1facf9fc | 29550 | + shared = 0; |
92d182d2 | 29551 | + for (i = 0; !shared && i < bindex; i++) |
1facf9fc | 29552 | + shared = (au_sbr_sb(sb, i) == h_sb); |
29553 | + if (shared) | |
29554 | + continue; | |
29555 | + | |
29556 | + /* sb->s_root for NFS is unreliable */ | |
7f207e10 AM |
29557 | + h_path.dentry = h_path.mnt->mnt_root; |
29558 | + err = vfs_statfs(&h_path, buf); | |
1facf9fc | 29559 | + if (unlikely(err)) |
29560 | + goto out; | |
29561 | + | |
92d182d2 AM |
29562 | + if (bsize > buf->f_bsize) { |
29563 | + /* | |
29564 | + * we will reduce bsize, so we have to expand blocks | |
29565 | + * etc. to match them again | |
29566 | + */ | |
29567 | + factor = (bsize / buf->f_bsize); | |
29568 | + blocks = au_mul_till_max(blocks, factor); | |
29569 | + bfree = au_mul_till_max(bfree, factor); | |
29570 | + bavail = au_mul_till_max(bavail, factor); | |
29571 | + bsize = buf->f_bsize; | |
29572 | + } | |
29573 | + | |
29574 | + factor = (buf->f_bsize / bsize); | |
29575 | + blocks = au_add_till_max(blocks, | |
29576 | + au_mul_till_max(buf->f_blocks, factor)); | |
29577 | + bfree = au_add_till_max(bfree, | |
29578 | + au_mul_till_max(buf->f_bfree, factor)); | |
29579 | + bavail = au_add_till_max(bavail, | |
29580 | + au_mul_till_max(buf->f_bavail, factor)); | |
1facf9fc | 29581 | + files = au_add_till_max(files, buf->f_files); |
29582 | + ffree = au_add_till_max(ffree, buf->f_ffree); | |
29583 | + } | |
29584 | + | |
92d182d2 | 29585 | + buf->f_bsize = bsize; |
1facf9fc | 29586 | + buf->f_blocks = blocks; |
29587 | + buf->f_bfree = bfree; | |
29588 | + buf->f_bavail = bavail; | |
29589 | + buf->f_files = files; | |
29590 | + buf->f_ffree = ffree; | |
92d182d2 | 29591 | + buf->f_frsize = 0; |
1facf9fc | 29592 | + |
4f0767ce | 29593 | +out: |
1facf9fc | 29594 | + return err; |
29595 | +} | |
29596 | + | |
29597 | +static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
29598 | +{ | |
29599 | + int err; | |
7f207e10 | 29600 | + struct path h_path; |
1facf9fc | 29601 | + struct super_block *sb; |
29602 | + | |
29603 | + /* lock free root dinfo */ | |
29604 | + sb = dentry->d_sb; | |
29605 | + si_noflush_read_lock(sb); | |
7f207e10 | 29606 | + if (!au_opt_test(au_mntflags(sb), SUM)) { |
1facf9fc | 29607 | + /* sb->s_root for NFS is unreliable */ |
7f207e10 AM |
29608 | + h_path.mnt = au_sbr_mnt(sb, 0); |
29609 | + h_path.dentry = h_path.mnt->mnt_root; | |
29610 | + err = vfs_statfs(&h_path, buf); | |
29611 | + } else | |
1facf9fc | 29612 | + err = au_statfs_sum(sb, buf); |
29613 | + si_read_unlock(sb); | |
29614 | + | |
29615 | + if (!err) { | |
29616 | + buf->f_type = AUFS_SUPER_MAGIC; | |
4a4d8108 | 29617 | + buf->f_namelen = AUFS_MAX_NAMELEN; |
1facf9fc | 29618 | + memset(&buf->f_fsid, 0, sizeof(buf->f_fsid)); |
29619 | + } | |
29620 | + /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */ | |
29621 | + | |
29622 | + return err; | |
29623 | +} | |
29624 | + | |
29625 | +/* ---------------------------------------------------------------------- */ | |
29626 | + | |
537831f9 AM |
29627 | +static int aufs_sync_fs(struct super_block *sb, int wait) |
29628 | +{ | |
29629 | + int err, e; | |
5afbbe0d | 29630 | + aufs_bindex_t bbot, bindex; |
537831f9 AM |
29631 | + struct au_branch *br; |
29632 | + struct super_block *h_sb; | |
29633 | + | |
29634 | + err = 0; | |
29635 | + si_noflush_read_lock(sb); | |
5afbbe0d AM |
29636 | + bbot = au_sbbot(sb); |
29637 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
537831f9 AM |
29638 | + br = au_sbr(sb, bindex); |
29639 | + if (!au_br_writable(br->br_perm)) | |
29640 | + continue; | |
29641 | + | |
29642 | + h_sb = au_sbr_sb(sb, bindex); | |
a2654f78 AM |
29643 | + e = vfsub_sync_filesystem(h_sb, wait); |
29644 | + if (unlikely(e && !err)) | |
29645 | + err = e; | |
29646 | + /* go on even if an error happens */ | |
537831f9 AM |
29647 | + } |
29648 | + si_read_unlock(sb); | |
29649 | + | |
29650 | + return err; | |
29651 | +} | |
29652 | + | |
29653 | +/* ---------------------------------------------------------------------- */ | |
29654 | + | |
1facf9fc | 29655 | +/* final actions when unmounting a file system */ |
29656 | +static void aufs_put_super(struct super_block *sb) | |
29657 | +{ | |
29658 | + struct au_sbinfo *sbinfo; | |
29659 | + | |
29660 | + sbinfo = au_sbi(sb); | |
062440b3 AM |
29661 | + if (sbinfo) |
29662 | + kobject_put(&sbinfo->si_kobj); | |
1facf9fc | 29663 | +} |
29664 | + | |
29665 | +/* ---------------------------------------------------------------------- */ | |
29666 | + | |
79b8bda9 AM |
29667 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, |
29668 | + struct super_block *sb, void *arg) | |
7f207e10 AM |
29669 | +{ |
29670 | + void *array; | |
076b876e | 29671 | + unsigned long long n, sz; |
7f207e10 AM |
29672 | + |
29673 | + array = NULL; | |
29674 | + n = 0; | |
29675 | + if (!*hint) | |
29676 | + goto out; | |
29677 | + | |
29678 | + if (*hint > ULLONG_MAX / sizeof(array)) { | |
29679 | + array = ERR_PTR(-EMFILE); | |
29680 | + pr_err("hint %llu\n", *hint); | |
29681 | + goto out; | |
29682 | + } | |
29683 | + | |
076b876e AM |
29684 | + sz = sizeof(array) * *hint; |
29685 | + array = kzalloc(sz, GFP_NOFS); | |
7f207e10 | 29686 | + if (unlikely(!array)) |
076b876e | 29687 | + array = vzalloc(sz); |
7f207e10 AM |
29688 | + if (unlikely(!array)) { |
29689 | + array = ERR_PTR(-ENOMEM); | |
29690 | + goto out; | |
29691 | + } | |
29692 | + | |
79b8bda9 | 29693 | + n = cb(sb, array, *hint, arg); |
7f207e10 AM |
29694 | + AuDebugOn(n > *hint); |
29695 | + | |
29696 | +out: | |
29697 | + *hint = n; | |
29698 | + return array; | |
29699 | +} | |
29700 | + | |
79b8bda9 | 29701 | +static unsigned long long au_iarray_cb(struct super_block *sb, void *a, |
7f207e10 AM |
29702 | + unsigned long long max __maybe_unused, |
29703 | + void *arg) | |
29704 | +{ | |
29705 | + unsigned long long n; | |
29706 | + struct inode **p, *inode; | |
29707 | + struct list_head *head; | |
29708 | + | |
29709 | + n = 0; | |
29710 | + p = a; | |
29711 | + head = arg; | |
79b8bda9 | 29712 | + spin_lock(&sb->s_inode_list_lock); |
7f207e10 | 29713 | + list_for_each_entry(inode, head, i_sb_list) { |
5afbbe0d AM |
29714 | + if (!au_is_bad_inode(inode) |
29715 | + && au_ii(inode)->ii_btop >= 0) { | |
2cbb1c4b JR |
29716 | + spin_lock(&inode->i_lock); |
29717 | + if (atomic_read(&inode->i_count)) { | |
29718 | + au_igrab(inode); | |
29719 | + *p++ = inode; | |
29720 | + n++; | |
29721 | + AuDebugOn(n > max); | |
29722 | + } | |
29723 | + spin_unlock(&inode->i_lock); | |
7f207e10 AM |
29724 | + } |
29725 | + } | |
79b8bda9 | 29726 | + spin_unlock(&sb->s_inode_list_lock); |
7f207e10 AM |
29727 | + |
29728 | + return n; | |
29729 | +} | |
29730 | + | |
29731 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max) | |
29732 | +{ | |
5afbbe0d | 29733 | + *max = au_ninodes(sb); |
79b8bda9 | 29734 | + return au_array_alloc(max, au_iarray_cb, sb, &sb->s_inodes); |
7f207e10 AM |
29735 | +} |
29736 | + | |
29737 | +void au_iarray_free(struct inode **a, unsigned long long max) | |
29738 | +{ | |
29739 | + unsigned long long ull; | |
29740 | + | |
29741 | + for (ull = 0; ull < max; ull++) | |
29742 | + iput(a[ull]); | |
be52b249 | 29743 | + kvfree(a); |
7f207e10 AM |
29744 | +} |
29745 | + | |
29746 | +/* ---------------------------------------------------------------------- */ | |
29747 | + | |
1facf9fc | 29748 | +/* |
29749 | + * refresh dentry and inode at remount time. | |
29750 | + */ | |
027c5e7a AM |
29751 | +/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */ |
29752 | +static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags, | |
29753 | + struct dentry *parent) | |
1facf9fc | 29754 | +{ |
29755 | + int err; | |
1facf9fc | 29756 | + |
29757 | + di_write_lock_child(dentry); | |
1facf9fc | 29758 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a AM |
29759 | + err = au_refresh_dentry(dentry, parent); |
29760 | + if (!err && dir_flags) | |
5527c038 | 29761 | + au_hn_reset(d_inode(dentry), dir_flags); |
1facf9fc | 29762 | + di_read_unlock(parent, AuLock_IR); |
1facf9fc | 29763 | + di_write_unlock(dentry); |
29764 | + | |
29765 | + return err; | |
29766 | +} | |
29767 | + | |
027c5e7a AM |
29768 | +static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen, |
29769 | + struct au_sbinfo *sbinfo, | |
b95c5147 | 29770 | + const unsigned int dir_flags, unsigned int do_idop) |
1facf9fc | 29771 | +{ |
027c5e7a AM |
29772 | + int err; |
29773 | + struct dentry *parent; | |
027c5e7a AM |
29774 | + |
29775 | + err = 0; | |
29776 | + parent = dget_parent(dentry); | |
29777 | + if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) { | |
5527c038 JR |
29778 | + if (d_really_is_positive(dentry)) { |
29779 | + if (!d_is_dir(dentry)) | |
027c5e7a AM |
29780 | + err = au_do_refresh(dentry, /*dir_flags*/0, |
29781 | + parent); | |
29782 | + else { | |
29783 | + err = au_do_refresh(dentry, dir_flags, parent); | |
29784 | + if (unlikely(err)) | |
29785 | + au_fset_si(sbinfo, FAILED_REFRESH_DIR); | |
29786 | + } | |
29787 | + } else | |
29788 | + err = au_do_refresh(dentry, /*dir_flags*/0, parent); | |
29789 | + AuDbgDentry(dentry); | |
29790 | + } | |
29791 | + dput(parent); | |
29792 | + | |
79b8bda9 | 29793 | + if (!err) { |
b95c5147 | 29794 | + if (do_idop) |
79b8bda9 AM |
29795 | + au_refresh_dop(dentry, /*force_reval*/0); |
29796 | + } else | |
29797 | + au_refresh_dop(dentry, /*force_reval*/1); | |
29798 | + | |
027c5e7a AM |
29799 | + AuTraceErr(err); |
29800 | + return err; | |
1facf9fc | 29801 | +} |
29802 | + | |
b95c5147 | 29803 | +static int au_refresh_d(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 29804 | +{ |
29805 | + int err, i, j, ndentry, e; | |
027c5e7a | 29806 | + unsigned int sigen; |
1facf9fc | 29807 | + struct au_dcsub_pages dpages; |
29808 | + struct au_dpage *dpage; | |
027c5e7a AM |
29809 | + struct dentry **dentries, *d; |
29810 | + struct au_sbinfo *sbinfo; | |
29811 | + struct dentry *root = sb->s_root; | |
5527c038 | 29812 | + const unsigned int dir_flags = au_hi_flags(d_inode(root), /*isdir*/1); |
1facf9fc | 29813 | + |
b95c5147 | 29814 | + if (do_idop) |
79b8bda9 AM |
29815 | + au_refresh_dop(root, /*force_reval*/0); |
29816 | + | |
027c5e7a AM |
29817 | + err = au_dpages_init(&dpages, GFP_NOFS); |
29818 | + if (unlikely(err)) | |
1facf9fc | 29819 | + goto out; |
027c5e7a AM |
29820 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); |
29821 | + if (unlikely(err)) | |
1facf9fc | 29822 | + goto out_dpages; |
1facf9fc | 29823 | + |
027c5e7a AM |
29824 | + sigen = au_sigen(sb); |
29825 | + sbinfo = au_sbi(sb); | |
29826 | + for (i = 0; i < dpages.ndpage; i++) { | |
1facf9fc | 29827 | + dpage = dpages.dpages + i; |
29828 | + dentries = dpage->dentries; | |
29829 | + ndentry = dpage->ndentry; | |
027c5e7a | 29830 | + for (j = 0; j < ndentry; j++) { |
1facf9fc | 29831 | + d = dentries[j]; |
79b8bda9 | 29832 | + e = au_do_refresh_d(d, sigen, sbinfo, dir_flags, |
b95c5147 | 29833 | + do_idop); |
027c5e7a AM |
29834 | + if (unlikely(e && !err)) |
29835 | + err = e; | |
29836 | + /* go on even err */ | |
1facf9fc | 29837 | + } |
29838 | + } | |
29839 | + | |
4f0767ce | 29840 | +out_dpages: |
1facf9fc | 29841 | + au_dpages_free(&dpages); |
4f0767ce | 29842 | +out: |
1facf9fc | 29843 | + return err; |
29844 | +} | |
29845 | + | |
b95c5147 | 29846 | +static int au_refresh_i(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 29847 | +{ |
027c5e7a AM |
29848 | + int err, e; |
29849 | + unsigned int sigen; | |
29850 | + unsigned long long max, ull; | |
29851 | + struct inode *inode, **array; | |
1facf9fc | 29852 | + |
027c5e7a AM |
29853 | + array = au_iarray_alloc(sb, &max); |
29854 | + err = PTR_ERR(array); | |
29855 | + if (IS_ERR(array)) | |
29856 | + goto out; | |
1facf9fc | 29857 | + |
29858 | + err = 0; | |
027c5e7a AM |
29859 | + sigen = au_sigen(sb); |
29860 | + for (ull = 0; ull < max; ull++) { | |
29861 | + inode = array[ull]; | |
076b876e AM |
29862 | + if (unlikely(!inode)) |
29863 | + break; | |
b95c5147 AM |
29864 | + |
29865 | + e = 0; | |
29866 | + ii_write_lock_child(inode); | |
537831f9 | 29867 | + if (au_iigen(inode, NULL) != sigen) { |
027c5e7a | 29868 | + e = au_refresh_hinode_self(inode); |
1facf9fc | 29869 | + if (unlikely(e)) { |
b95c5147 | 29870 | + au_refresh_iop(inode, /*force_getattr*/1); |
027c5e7a | 29871 | + pr_err("error %d, i%lu\n", e, inode->i_ino); |
1facf9fc | 29872 | + if (!err) |
29873 | + err = e; | |
29874 | + /* go on even if err */ | |
29875 | + } | |
29876 | + } | |
b95c5147 AM |
29877 | + if (!e && do_idop) |
29878 | + au_refresh_iop(inode, /*force_getattr*/0); | |
29879 | + ii_write_unlock(inode); | |
1facf9fc | 29880 | + } |
29881 | + | |
027c5e7a | 29882 | + au_iarray_free(array, max); |
1facf9fc | 29883 | + |
4f0767ce | 29884 | +out: |
1facf9fc | 29885 | + return err; |
29886 | +} | |
29887 | + | |
b95c5147 | 29888 | +static void au_remount_refresh(struct super_block *sb, unsigned int do_idop) |
1facf9fc | 29889 | +{ |
027c5e7a AM |
29890 | + int err, e; |
29891 | + unsigned int udba; | |
5afbbe0d | 29892 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 29893 | + struct dentry *root; |
29894 | + struct inode *inode; | |
027c5e7a | 29895 | + struct au_branch *br; |
79b8bda9 | 29896 | + struct au_sbinfo *sbi; |
1facf9fc | 29897 | + |
29898 | + au_sigen_inc(sb); | |
79b8bda9 AM |
29899 | + sbi = au_sbi(sb); |
29900 | + au_fclr_si(sbi, FAILED_REFRESH_DIR); | |
1facf9fc | 29901 | + |
29902 | + root = sb->s_root; | |
29903 | + DiMustNoWaiters(root); | |
5527c038 | 29904 | + inode = d_inode(root); |
1facf9fc | 29905 | + IiMustNoWaiters(inode); |
1facf9fc | 29906 | + |
027c5e7a | 29907 | + udba = au_opt_udba(sb); |
5afbbe0d AM |
29908 | + bbot = au_sbbot(sb); |
29909 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
027c5e7a AM |
29910 | + br = au_sbr(sb, bindex); |
29911 | + err = au_hnotify_reset_br(udba, br, br->br_perm); | |
1facf9fc | 29912 | + if (unlikely(err)) |
027c5e7a AM |
29913 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", |
29914 | + bindex, err); | |
29915 | + /* go on even if err */ | |
1facf9fc | 29916 | + } |
027c5e7a | 29917 | + au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1)); |
1facf9fc | 29918 | + |
b95c5147 | 29919 | + if (do_idop) { |
79b8bda9 AM |
29920 | + if (au_ftest_si(sbi, NO_DREVAL)) { |
29921 | + AuDebugOn(sb->s_d_op == &aufs_dop_noreval); | |
29922 | + sb->s_d_op = &aufs_dop_noreval; | |
b95c5147 AM |
29923 | + AuDebugOn(sbi->si_iop_array == aufs_iop_nogetattr); |
29924 | + sbi->si_iop_array = aufs_iop_nogetattr; | |
79b8bda9 AM |
29925 | + } else { |
29926 | + AuDebugOn(sb->s_d_op == &aufs_dop); | |
29927 | + sb->s_d_op = &aufs_dop; | |
b95c5147 AM |
29928 | + AuDebugOn(sbi->si_iop_array == aufs_iop); |
29929 | + sbi->si_iop_array = aufs_iop; | |
79b8bda9 | 29930 | + } |
062440b3 | 29931 | + pr_info("reset to %ps and %ps\n", |
b95c5147 | 29932 | + sb->s_d_op, sbi->si_iop_array); |
79b8bda9 AM |
29933 | + } |
29934 | + | |
027c5e7a | 29935 | + di_write_unlock(root); |
b95c5147 AM |
29936 | + err = au_refresh_d(sb, do_idop); |
29937 | + e = au_refresh_i(sb, do_idop); | |
027c5e7a AM |
29938 | + if (unlikely(e && !err)) |
29939 | + err = e; | |
1facf9fc | 29940 | + /* aufs_write_lock() calls ..._child() */ |
29941 | + di_write_lock_child(root); | |
027c5e7a AM |
29942 | + |
29943 | + au_cpup_attr_all(inode, /*force*/1); | |
29944 | + | |
29945 | + if (unlikely(err)) | |
29946 | + AuIOErr("refresh failed, ignored, %d\n", err); | |
1facf9fc | 29947 | +} |
29948 | + | |
29949 | +/* stop extra interpretation of errno in mount(8), and strange error messages */ | |
29950 | +static int cvt_err(int err) | |
29951 | +{ | |
29952 | + AuTraceErr(err); | |
29953 | + | |
29954 | + switch (err) { | |
29955 | + case -ENOENT: | |
29956 | + case -ENOTDIR: | |
29957 | + case -EEXIST: | |
29958 | + case -EIO: | |
29959 | + err = -EINVAL; | |
29960 | + } | |
29961 | + return err; | |
29962 | +} | |
29963 | + | |
29964 | +static int aufs_remount_fs(struct super_block *sb, int *flags, char *data) | |
29965 | +{ | |
4a4d8108 AM |
29966 | + int err, do_dx; |
29967 | + unsigned int mntflags; | |
be52b249 AM |
29968 | + struct au_opts opts = { |
29969 | + .opt = NULL | |
29970 | + }; | |
1facf9fc | 29971 | + struct dentry *root; |
29972 | + struct inode *inode; | |
29973 | + struct au_sbinfo *sbinfo; | |
29974 | + | |
29975 | + err = 0; | |
29976 | + root = sb->s_root; | |
29977 | + if (!data || !*data) { | |
e49829fe JR |
29978 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
29979 | + if (!err) { | |
29980 | + di_write_lock_child(root); | |
29981 | + err = au_opts_verify(sb, *flags, /*pending*/0); | |
29982 | + aufs_write_unlock(root); | |
29983 | + } | |
1facf9fc | 29984 | + goto out; |
29985 | + } | |
29986 | + | |
29987 | + err = -ENOMEM; | |
1facf9fc | 29988 | + opts.opt = (void *)__get_free_page(GFP_NOFS); |
29989 | + if (unlikely(!opts.opt)) | |
29990 | + goto out; | |
29991 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
29992 | + opts.flags = AuOpts_REMOUNT; | |
29993 | + opts.sb_flags = *flags; | |
29994 | + | |
29995 | + /* parse it before aufs lock */ | |
29996 | + err = au_opts_parse(sb, data, &opts); | |
29997 | + if (unlikely(err)) | |
29998 | + goto out_opts; | |
29999 | + | |
30000 | + sbinfo = au_sbi(sb); | |
5527c038 | 30001 | + inode = d_inode(root); |
febd17d6 | 30002 | + inode_lock(inode); |
e49829fe JR |
30003 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
30004 | + if (unlikely(err)) | |
30005 | + goto out_mtx; | |
30006 | + di_write_lock_child(root); | |
1facf9fc | 30007 | + |
30008 | + /* au_opts_remount() may return an error */ | |
30009 | + err = au_opts_remount(sb, &opts); | |
30010 | + au_opts_free(&opts); | |
30011 | + | |
027c5e7a | 30012 | + if (au_ftest_opts(opts.flags, REFRESH)) |
b95c5147 | 30013 | + au_remount_refresh(sb, au_ftest_opts(opts.flags, REFRESH_IDOP)); |
1facf9fc | 30014 | + |
4a4d8108 AM |
30015 | + if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) { |
30016 | + mntflags = au_mntflags(sb); | |
30017 | + do_dx = !!au_opt_test(mntflags, DIO); | |
30018 | + au_dy_arefresh(do_dx); | |
30019 | + } | |
30020 | + | |
076b876e | 30021 | + au_fhsm_wrote_all(sb, /*force*/1); /* ?? */ |
1facf9fc | 30022 | + aufs_write_unlock(root); |
953406b4 | 30023 | + |
e49829fe | 30024 | +out_mtx: |
febd17d6 | 30025 | + inode_unlock(inode); |
4f0767ce | 30026 | +out_opts: |
1c60b727 | 30027 | + free_page((unsigned long)opts.opt); |
4f0767ce | 30028 | +out: |
1facf9fc | 30029 | + err = cvt_err(err); |
30030 | + AuTraceErr(err); | |
30031 | + return err; | |
30032 | +} | |
30033 | + | |
4a4d8108 | 30034 | +static const struct super_operations aufs_sop = { |
1facf9fc | 30035 | + .alloc_inode = aufs_alloc_inode, |
30036 | + .destroy_inode = aufs_destroy_inode, | |
b752ccd1 | 30037 | + /* always deleting, no clearing */ |
1facf9fc | 30038 | + .drop_inode = generic_delete_inode, |
30039 | + .show_options = aufs_show_options, | |
30040 | + .statfs = aufs_statfs, | |
30041 | + .put_super = aufs_put_super, | |
537831f9 | 30042 | + .sync_fs = aufs_sync_fs, |
1facf9fc | 30043 | + .remount_fs = aufs_remount_fs |
30044 | +}; | |
30045 | + | |
30046 | +/* ---------------------------------------------------------------------- */ | |
30047 | + | |
30048 | +static int alloc_root(struct super_block *sb) | |
30049 | +{ | |
30050 | + int err; | |
30051 | + struct inode *inode; | |
30052 | + struct dentry *root; | |
30053 | + | |
30054 | + err = -ENOMEM; | |
30055 | + inode = au_iget_locked(sb, AUFS_ROOT_INO); | |
30056 | + err = PTR_ERR(inode); | |
30057 | + if (IS_ERR(inode)) | |
30058 | + goto out; | |
30059 | + | |
b95c5147 | 30060 | + inode->i_op = aufs_iop + AuIop_DIR; /* with getattr by default */ |
1facf9fc | 30061 | + inode->i_fop = &aufs_dir_fop; |
30062 | + inode->i_mode = S_IFDIR; | |
9dbd164d | 30063 | + set_nlink(inode, 2); |
1facf9fc | 30064 | + unlock_new_inode(inode); |
30065 | + | |
92d182d2 | 30066 | + root = d_make_root(inode); |
1facf9fc | 30067 | + if (unlikely(!root)) |
92d182d2 | 30068 | + goto out; |
1facf9fc | 30069 | + err = PTR_ERR(root); |
30070 | + if (IS_ERR(root)) | |
92d182d2 | 30071 | + goto out; |
1facf9fc | 30072 | + |
4a4d8108 | 30073 | + err = au_di_init(root); |
1facf9fc | 30074 | + if (!err) { |
30075 | + sb->s_root = root; | |
30076 | + return 0; /* success */ | |
30077 | + } | |
30078 | + dput(root); | |
1facf9fc | 30079 | + |
4f0767ce | 30080 | +out: |
1facf9fc | 30081 | + return err; |
1facf9fc | 30082 | +} |
30083 | + | |
30084 | +static int aufs_fill_super(struct super_block *sb, void *raw_data, | |
30085 | + int silent __maybe_unused) | |
30086 | +{ | |
30087 | + int err; | |
be52b249 AM |
30088 | + struct au_opts opts = { |
30089 | + .opt = NULL | |
30090 | + }; | |
79b8bda9 | 30091 | + struct au_sbinfo *sbinfo; |
1facf9fc | 30092 | + struct dentry *root; |
30093 | + struct inode *inode; | |
30094 | + char *arg = raw_data; | |
30095 | + | |
30096 | + if (unlikely(!arg || !*arg)) { | |
30097 | + err = -EINVAL; | |
4a4d8108 | 30098 | + pr_err("no arg\n"); |
1facf9fc | 30099 | + goto out; |
30100 | + } | |
30101 | + | |
30102 | + err = -ENOMEM; | |
1facf9fc | 30103 | + opts.opt = (void *)__get_free_page(GFP_NOFS); |
30104 | + if (unlikely(!opts.opt)) | |
30105 | + goto out; | |
30106 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
30107 | + opts.sb_flags = sb->s_flags; | |
30108 | + | |
30109 | + err = au_si_alloc(sb); | |
30110 | + if (unlikely(err)) | |
30111 | + goto out_opts; | |
79b8bda9 | 30112 | + sbinfo = au_sbi(sb); |
1facf9fc | 30113 | + |
30114 | + /* all timestamps always follow the ones on the branch */ | |
2121bcd9 | 30115 | + sb->s_flags |= SB_NOATIME | SB_NODIRATIME; |
be118d29 | 30116 | + sb->s_flags |= SB_I_VERSION; /* do we really need this? */ |
1facf9fc | 30117 | + sb->s_op = &aufs_sop; |
027c5e7a | 30118 | + sb->s_d_op = &aufs_dop; |
1facf9fc | 30119 | + sb->s_magic = AUFS_SUPER_MAGIC; |
30120 | + sb->s_maxbytes = 0; | |
c1595e42 | 30121 | + sb->s_stack_depth = 1; |
1facf9fc | 30122 | + au_export_init(sb); |
f2c43d5f | 30123 | + au_xattr_init(sb); |
1facf9fc | 30124 | + |
30125 | + err = alloc_root(sb); | |
30126 | + if (unlikely(err)) { | |
30127 | + si_write_unlock(sb); | |
30128 | + goto out_info; | |
30129 | + } | |
30130 | + root = sb->s_root; | |
5527c038 | 30131 | + inode = d_inode(root); |
1facf9fc | 30132 | + |
30133 | + /* | |
30134 | + * actually we can parse options regardless aufs lock here. | |
30135 | + * but at remount time, parsing must be done before aufs lock. | |
30136 | + * so we follow the same rule. | |
30137 | + */ | |
30138 | + ii_write_lock_parent(inode); | |
30139 | + aufs_write_unlock(root); | |
30140 | + err = au_opts_parse(sb, arg, &opts); | |
30141 | + if (unlikely(err)) | |
30142 | + goto out_root; | |
30143 | + | |
30144 | + /* lock vfs_inode first, then aufs. */ | |
febd17d6 | 30145 | + inode_lock(inode); |
1facf9fc | 30146 | + aufs_write_lock(root); |
30147 | + err = au_opts_mount(sb, &opts); | |
30148 | + au_opts_free(&opts); | |
79b8bda9 AM |
30149 | + if (!err && au_ftest_si(sbinfo, NO_DREVAL)) { |
30150 | + sb->s_d_op = &aufs_dop_noreval; | |
062440b3 | 30151 | + pr_info("%ps\n", sb->s_d_op); |
79b8bda9 | 30152 | + au_refresh_dop(root, /*force_reval*/0); |
b95c5147 AM |
30153 | + sbinfo->si_iop_array = aufs_iop_nogetattr; |
30154 | + au_refresh_iop(inode, /*force_getattr*/0); | |
79b8bda9 | 30155 | + } |
1facf9fc | 30156 | + aufs_write_unlock(root); |
febd17d6 | 30157 | + inode_unlock(inode); |
4a4d8108 AM |
30158 | + if (!err) |
30159 | + goto out_opts; /* success */ | |
1facf9fc | 30160 | + |
4f0767ce | 30161 | +out_root: |
1facf9fc | 30162 | + dput(root); |
30163 | + sb->s_root = NULL; | |
4f0767ce | 30164 | +out_info: |
79b8bda9 | 30165 | + kobject_put(&sbinfo->si_kobj); |
1facf9fc | 30166 | + sb->s_fs_info = NULL; |
4f0767ce | 30167 | +out_opts: |
1c60b727 | 30168 | + free_page((unsigned long)opts.opt); |
4f0767ce | 30169 | +out: |
1facf9fc | 30170 | + AuTraceErr(err); |
30171 | + err = cvt_err(err); | |
30172 | + AuTraceErr(err); | |
30173 | + return err; | |
30174 | +} | |
30175 | + | |
30176 | +/* ---------------------------------------------------------------------- */ | |
30177 | + | |
027c5e7a AM |
30178 | +static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags, |
30179 | + const char *dev_name __maybe_unused, | |
30180 | + void *raw_data) | |
1facf9fc | 30181 | +{ |
027c5e7a | 30182 | + struct dentry *root; |
1facf9fc | 30183 | + |
30184 | + /* all timestamps always follow the ones on the branch */ | |
30185 | + /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */ | |
027c5e7a AM |
30186 | + root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super); |
30187 | + if (IS_ERR(root)) | |
30188 | + goto out; | |
30189 | + | |
062440b3 | 30190 | + au_sbilist_add(root->d_sb); |
027c5e7a AM |
30191 | + |
30192 | +out: | |
30193 | + return root; | |
1facf9fc | 30194 | +} |
30195 | + | |
e49829fe JR |
30196 | +static void aufs_kill_sb(struct super_block *sb) |
30197 | +{ | |
30198 | + struct au_sbinfo *sbinfo; | |
30199 | + | |
30200 | + sbinfo = au_sbi(sb); | |
30201 | + if (sbinfo) { | |
30202 | + au_sbilist_del(sb); | |
30203 | + aufs_write_lock(sb->s_root); | |
076b876e | 30204 | + au_fhsm_fin(sb); |
e49829fe JR |
30205 | + if (sbinfo->si_wbr_create_ops->fin) |
30206 | + sbinfo->si_wbr_create_ops->fin(sb); | |
30207 | + if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) { | |
30208 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE); | |
b95c5147 | 30209 | + au_remount_refresh(sb, /*do_idop*/0); |
e49829fe JR |
30210 | + } |
30211 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
30212 | + au_plink_put(sb, /*verbose*/1); | |
30213 | + au_xino_clr(sb); | |
8b6a4947 | 30214 | + au_dr_opt_flush(sb); |
1e00d052 | 30215 | + sbinfo->si_sb = NULL; |
e49829fe | 30216 | + aufs_write_unlock(sb->s_root); |
e49829fe JR |
30217 | + au_nwt_flush(&sbinfo->si_nowait); |
30218 | + } | |
98d9a5b1 | 30219 | + kill_anon_super(sb); |
e49829fe JR |
30220 | +} |
30221 | + | |
1facf9fc | 30222 | +struct file_system_type aufs_fs_type = { |
30223 | + .name = AUFS_FSTYPE, | |
c06a8ce3 AM |
30224 | + /* a race between rename and others */ |
30225 | + .fs_flags = FS_RENAME_DOES_D_MOVE, | |
027c5e7a | 30226 | + .mount = aufs_mount, |
e49829fe | 30227 | + .kill_sb = aufs_kill_sb, |
1facf9fc | 30228 | + /* no need to __module_get() and module_put(). */ |
30229 | + .owner = THIS_MODULE, | |
30230 | +}; | |
7f207e10 AM |
30231 | diff -urN /usr/share/empty/fs/aufs/super.h linux/fs/aufs/super.h |
30232 | --- /usr/share/empty/fs/aufs/super.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 30233 | +++ linux/fs/aufs/super.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
30234 | @@ -0,0 +1,627 @@ |
30235 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 30236 | +/* |
b00004a5 | 30237 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 30238 | + * |
30239 | + * This program, aufs is free software; you can redistribute it and/or modify | |
30240 | + * it under the terms of the GNU General Public License as published by | |
30241 | + * the Free Software Foundation; either version 2 of the License, or | |
30242 | + * (at your option) any later version. | |
dece6358 AM |
30243 | + * |
30244 | + * This program is distributed in the hope that it will be useful, | |
30245 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30246 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30247 | + * GNU General Public License for more details. | |
30248 | + * | |
30249 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 30250 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 30251 | + */ |
30252 | + | |
30253 | +/* | |
30254 | + * super_block operations | |
30255 | + */ | |
30256 | + | |
30257 | +#ifndef __AUFS_SUPER_H__ | |
30258 | +#define __AUFS_SUPER_H__ | |
30259 | + | |
30260 | +#ifdef __KERNEL__ | |
30261 | + | |
30262 | +#include <linux/fs.h> | |
5527c038 | 30263 | +#include <linux/kobject.h> |
8b6a4947 | 30264 | +#include "hbl.h" |
1facf9fc | 30265 | +#include "rwsem.h" |
1facf9fc | 30266 | +#include "wkq.h" |
30267 | + | |
1facf9fc | 30268 | +/* policies to select one among multiple writable branches */ |
30269 | +struct au_wbr_copyup_operations { | |
30270 | + int (*copyup)(struct dentry *dentry); | |
30271 | +}; | |
30272 | + | |
392086de AM |
30273 | +#define AuWbr_DIR 1 /* target is a dir */ |
30274 | +#define AuWbr_PARENT (1 << 1) /* always require a parent */ | |
30275 | + | |
30276 | +#define au_ftest_wbr(flags, name) ((flags) & AuWbr_##name) | |
30277 | +#define au_fset_wbr(flags, name) { (flags) |= AuWbr_##name; } | |
30278 | +#define au_fclr_wbr(flags, name) { (flags) &= ~AuWbr_##name; } | |
30279 | + | |
1facf9fc | 30280 | +struct au_wbr_create_operations { |
392086de | 30281 | + int (*create)(struct dentry *dentry, unsigned int flags); |
1facf9fc | 30282 | + int (*init)(struct super_block *sb); |
30283 | + int (*fin)(struct super_block *sb); | |
30284 | +}; | |
30285 | + | |
30286 | +struct au_wbr_mfs { | |
30287 | + struct mutex mfs_lock; /* protect this structure */ | |
30288 | + unsigned long mfs_jiffy; | |
30289 | + unsigned long mfs_expire; | |
30290 | + aufs_bindex_t mfs_bindex; | |
30291 | + | |
30292 | + unsigned long long mfsrr_bytes; | |
30293 | + unsigned long long mfsrr_watermark; | |
30294 | +}; | |
30295 | + | |
86dc4139 AM |
30296 | +#define AuPlink_NHASH 100 |
30297 | +static inline int au_plink_hash(ino_t ino) | |
30298 | +{ | |
30299 | + return ino % AuPlink_NHASH; | |
30300 | +} | |
30301 | + | |
076b876e AM |
30302 | +/* File-based Hierarchical Storage Management */ |
30303 | +struct au_fhsm { | |
30304 | +#ifdef CONFIG_AUFS_FHSM | |
30305 | + /* allow only one process who can receive the notification */ | |
30306 | + spinlock_t fhsm_spin; | |
30307 | + pid_t fhsm_pid; | |
30308 | + wait_queue_head_t fhsm_wqh; | |
30309 | + atomic_t fhsm_readable; | |
30310 | + | |
c1595e42 | 30311 | + /* these are protected by si_rwsem */ |
076b876e | 30312 | + unsigned long fhsm_expire; |
c1595e42 | 30313 | + aufs_bindex_t fhsm_bottom; |
076b876e AM |
30314 | +#endif |
30315 | +}; | |
30316 | + | |
1facf9fc | 30317 | +struct au_branch; |
30318 | +struct au_sbinfo { | |
30319 | + /* nowait tasks in the system-wide workqueue */ | |
30320 | + struct au_nowait_tasks si_nowait; | |
30321 | + | |
b752ccd1 AM |
30322 | + /* |
30323 | + * tried sb->s_umount, but failed due to the dependecy between i_mutex. | |
30324 | + * rwsem for au_sbinfo is necessary. | |
30325 | + */ | |
dece6358 | 30326 | + struct au_rwsem si_rwsem; |
1facf9fc | 30327 | + |
7f207e10 | 30328 | + /* |
523b37e3 AM |
30329 | + * dirty approach to protect sb->sb_inodes and ->s_files (gone) from |
30330 | + * remount. | |
7f207e10 | 30331 | + */ |
5afbbe0d | 30332 | + struct percpu_counter si_ninodes, si_nfiles; |
7f207e10 | 30333 | + |
1facf9fc | 30334 | + /* branch management */ |
30335 | + unsigned int si_generation; | |
30336 | + | |
2000de60 | 30337 | + /* see AuSi_ flags */ |
1facf9fc | 30338 | + unsigned char au_si_status; |
30339 | + | |
5afbbe0d | 30340 | + aufs_bindex_t si_bbot; |
7f207e10 AM |
30341 | + |
30342 | + /* dirty trick to keep br_id plus */ | |
30343 | + unsigned int si_last_br_id : | |
30344 | + sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1; | |
1facf9fc | 30345 | + struct au_branch **si_branch; |
30346 | + | |
30347 | + /* policy to select a writable branch */ | |
30348 | + unsigned char si_wbr_copyup; | |
30349 | + unsigned char si_wbr_create; | |
30350 | + struct au_wbr_copyup_operations *si_wbr_copyup_ops; | |
30351 | + struct au_wbr_create_operations *si_wbr_create_ops; | |
30352 | + | |
30353 | + /* round robin */ | |
30354 | + atomic_t si_wbr_rr_next; | |
30355 | + | |
30356 | + /* most free space */ | |
30357 | + struct au_wbr_mfs si_wbr_mfs; | |
30358 | + | |
076b876e AM |
30359 | + /* File-based Hierarchical Storage Management */ |
30360 | + struct au_fhsm si_fhsm; | |
30361 | + | |
1facf9fc | 30362 | + /* mount flags */ |
30363 | + /* include/asm-ia64/siginfo.h defines a macro named si_flags */ | |
30364 | + unsigned int si_mntflags; | |
30365 | + | |
30366 | + /* external inode number (bitmap and translation table) */ | |
5527c038 JR |
30367 | + vfs_readf_t si_xread; |
30368 | + vfs_writef_t si_xwrite; | |
1facf9fc | 30369 | + struct file *si_xib; |
30370 | + struct mutex si_xib_mtx; /* protect xib members */ | |
30371 | + unsigned long *si_xib_buf; | |
30372 | + unsigned long si_xib_last_pindex; | |
30373 | + int si_xib_next_bit; | |
30374 | + aufs_bindex_t si_xino_brid; | |
392086de AM |
30375 | + unsigned long si_xino_jiffy; |
30376 | + unsigned long si_xino_expire; | |
1facf9fc | 30377 | + /* reserved for future use */ |
30378 | + /* unsigned long long si_xib_limit; */ /* Max xib file size */ | |
30379 | + | |
30380 | +#ifdef CONFIG_AUFS_EXPORT | |
30381 | + /* i_generation */ | |
30382 | + struct file *si_xigen; | |
30383 | + atomic_t si_xigen_next; | |
30384 | +#endif | |
30385 | + | |
b912730e | 30386 | + /* dirty trick to suppoer atomic_open */ |
8b6a4947 | 30387 | + struct hlist_bl_head si_aopen; |
b912730e | 30388 | + |
1facf9fc | 30389 | + /* vdir parameters */ |
e49829fe | 30390 | + unsigned long si_rdcache; /* max cache time in jiffies */ |
1facf9fc | 30391 | + unsigned int si_rdblk; /* deblk size */ |
30392 | + unsigned int si_rdhash; /* hash size */ | |
30393 | + | |
30394 | + /* | |
30395 | + * If the number of whiteouts are larger than si_dirwh, leave all of | |
30396 | + * them after au_whtmp_ren to reduce the cost of rmdir(2). | |
30397 | + * future fsck.aufs or kernel thread will remove them later. | |
30398 | + * Otherwise, remove all whiteouts and the dir in rmdir(2). | |
30399 | + */ | |
30400 | + unsigned int si_dirwh; | |
30401 | + | |
1facf9fc | 30402 | + /* pseudo_link list */ |
8b6a4947 | 30403 | + struct hlist_bl_head si_plink[AuPlink_NHASH]; |
1facf9fc | 30404 | + wait_queue_head_t si_plink_wq; |
4a4d8108 | 30405 | + spinlock_t si_plink_maint_lock; |
e49829fe | 30406 | + pid_t si_plink_maint_pid; |
1facf9fc | 30407 | + |
523b37e3 | 30408 | + /* file list */ |
8b6a4947 | 30409 | + struct hlist_bl_head si_files; |
523b37e3 | 30410 | + |
b95c5147 AM |
30411 | + /* with/without getattr, brother of sb->s_d_op */ |
30412 | + struct inode_operations *si_iop_array; | |
30413 | + | |
1facf9fc | 30414 | + /* |
30415 | + * sysfs and lifetime management. | |
30416 | + * this is not a small structure and it may be a waste of memory in case | |
30417 | + * of sysfs is disabled, particulary when many aufs-es are mounted. | |
30418 | + * but using sysfs is majority. | |
30419 | + */ | |
30420 | + struct kobject si_kobj; | |
30421 | +#ifdef CONFIG_DEBUG_FS | |
86dc4139 AM |
30422 | + struct dentry *si_dbgaufs; |
30423 | + struct dentry *si_dbgaufs_plink; | |
30424 | + struct dentry *si_dbgaufs_xib; | |
1facf9fc | 30425 | +#ifdef CONFIG_AUFS_EXPORT |
30426 | + struct dentry *si_dbgaufs_xigen; | |
30427 | +#endif | |
30428 | +#endif | |
30429 | + | |
e49829fe | 30430 | +#ifdef CONFIG_AUFS_SBILIST |
8b6a4947 | 30431 | + struct hlist_bl_node si_list; |
e49829fe JR |
30432 | +#endif |
30433 | + | |
1facf9fc | 30434 | + /* dirty, necessary for unmounting, sysfs and sysrq */ |
30435 | + struct super_block *si_sb; | |
30436 | +}; | |
30437 | + | |
dece6358 AM |
30438 | +/* sbinfo status flags */ |
30439 | +/* | |
30440 | + * set true when refresh_dirs() failed at remount time. | |
30441 | + * then try refreshing dirs at access time again. | |
062440b3 | 30442 | + * if it is false, refreshing dirs at access time is unnecessary |
dece6358 | 30443 | + */ |
027c5e7a | 30444 | +#define AuSi_FAILED_REFRESH_DIR 1 |
076b876e | 30445 | +#define AuSi_FHSM (1 << 1) /* fhsm is active now */ |
79b8bda9 | 30446 | +#define AuSi_NO_DREVAL (1 << 2) /* disable all d_revalidate */ |
076b876e AM |
30447 | + |
30448 | +#ifndef CONFIG_AUFS_FHSM | |
30449 | +#undef AuSi_FHSM | |
30450 | +#define AuSi_FHSM 0 | |
30451 | +#endif | |
30452 | + | |
dece6358 AM |
30453 | +static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi, |
30454 | + unsigned int flag) | |
30455 | +{ | |
30456 | + AuRwMustAnyLock(&sbi->si_rwsem); | |
30457 | + return sbi->au_si_status & flag; | |
30458 | +} | |
30459 | +#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name) | |
30460 | +#define au_fset_si(sbinfo, name) do { \ | |
30461 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
30462 | + (sbinfo)->au_si_status |= AuSi_##name; \ | |
30463 | +} while (0) | |
30464 | +#define au_fclr_si(sbinfo, name) do { \ | |
30465 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
30466 | + (sbinfo)->au_si_status &= ~AuSi_##name; \ | |
30467 | +} while (0) | |
30468 | + | |
1facf9fc | 30469 | +/* ---------------------------------------------------------------------- */ |
30470 | + | |
30471 | +/* policy to select one among writable branches */ | |
4a4d8108 AM |
30472 | +#define AuWbrCopyup(sbinfo, ...) \ |
30473 | + ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__)) | |
30474 | +#define AuWbrCreate(sbinfo, ...) \ | |
30475 | + ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__)) | |
1facf9fc | 30476 | + |
30477 | +/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */ | |
30478 | +#define AuLock_DW 1 /* write-lock dentry */ | |
30479 | +#define AuLock_IR (1 << 1) /* read-lock inode */ | |
30480 | +#define AuLock_IW (1 << 2) /* write-lock inode */ | |
30481 | +#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */ | |
b95c5147 | 30482 | +#define AuLock_DIRS (1 << 4) /* target is a pair of dirs */ |
f2c43d5f | 30483 | + /* except RENAME_EXCHANGE */ |
e49829fe JR |
30484 | +#define AuLock_NOPLM (1 << 5) /* return err in plm mode */ |
30485 | +#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */ | |
027c5e7a | 30486 | +#define AuLock_GEN (1 << 7) /* test digen/iigen */ |
1facf9fc | 30487 | +#define au_ftest_lock(flags, name) ((flags) & AuLock_##name) |
7f207e10 AM |
30488 | +#define au_fset_lock(flags, name) \ |
30489 | + do { (flags) |= AuLock_##name; } while (0) | |
30490 | +#define au_fclr_lock(flags, name) \ | |
30491 | + do { (flags) &= ~AuLock_##name; } while (0) | |
1facf9fc | 30492 | + |
30493 | +/* ---------------------------------------------------------------------- */ | |
30494 | + | |
30495 | +/* super.c */ | |
30496 | +extern struct file_system_type aufs_fs_type; | |
30497 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino); | |
79b8bda9 AM |
30498 | +typedef unsigned long long (*au_arraycb_t)(struct super_block *sb, void *array, |
30499 | + unsigned long long max, void *arg); | |
79b8bda9 AM |
30500 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, |
30501 | + struct super_block *sb, void *arg); | |
7f207e10 AM |
30502 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max); |
30503 | +void au_iarray_free(struct inode **a, unsigned long long max); | |
1facf9fc | 30504 | + |
30505 | +/* sbinfo.c */ | |
30506 | +void au_si_free(struct kobject *kobj); | |
30507 | +int au_si_alloc(struct super_block *sb); | |
e2f27e51 | 30508 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr, int may_shrink); |
1facf9fc | 30509 | + |
30510 | +unsigned int au_sigen_inc(struct super_block *sb); | |
30511 | +aufs_bindex_t au_new_br_id(struct super_block *sb); | |
30512 | + | |
e49829fe JR |
30513 | +int si_read_lock(struct super_block *sb, int flags); |
30514 | +int si_write_lock(struct super_block *sb, int flags); | |
30515 | +int aufs_read_lock(struct dentry *dentry, int flags); | |
1facf9fc | 30516 | +void aufs_read_unlock(struct dentry *dentry, int flags); |
30517 | +void aufs_write_lock(struct dentry *dentry); | |
30518 | +void aufs_write_unlock(struct dentry *dentry); | |
e49829fe | 30519 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags); |
1facf9fc | 30520 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2); |
30521 | + | |
30522 | +/* wbr_policy.c */ | |
30523 | +extern struct au_wbr_copyup_operations au_wbr_copyup_ops[]; | |
30524 | +extern struct au_wbr_create_operations au_wbr_create_ops[]; | |
30525 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
c2b27bf2 | 30526 | +int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex); |
5afbbe0d | 30527 | +int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop); |
c2b27bf2 AM |
30528 | + |
30529 | +/* mvdown.c */ | |
30530 | +int au_mvdown(struct dentry *dentry, struct aufs_mvdown __user *arg); | |
1facf9fc | 30531 | + |
076b876e AM |
30532 | +#ifdef CONFIG_AUFS_FHSM |
30533 | +/* fhsm.c */ | |
30534 | + | |
30535 | +static inline pid_t au_fhsm_pid(struct au_fhsm *fhsm) | |
30536 | +{ | |
30537 | + pid_t pid; | |
30538 | + | |
30539 | + spin_lock(&fhsm->fhsm_spin); | |
30540 | + pid = fhsm->fhsm_pid; | |
30541 | + spin_unlock(&fhsm->fhsm_spin); | |
30542 | + | |
30543 | + return pid; | |
30544 | +} | |
30545 | + | |
30546 | +void au_fhsm_wrote(struct super_block *sb, aufs_bindex_t bindex, int force); | |
30547 | +void au_fhsm_wrote_all(struct super_block *sb, int force); | |
30548 | +int au_fhsm_fd(struct super_block *sb, int oflags); | |
30549 | +int au_fhsm_br_alloc(struct au_branch *br); | |
c1595e42 | 30550 | +void au_fhsm_set_bottom(struct super_block *sb, aufs_bindex_t bindex); |
076b876e AM |
30551 | +void au_fhsm_fin(struct super_block *sb); |
30552 | +void au_fhsm_init(struct au_sbinfo *sbinfo); | |
30553 | +void au_fhsm_set(struct au_sbinfo *sbinfo, unsigned int sec); | |
30554 | +void au_fhsm_show(struct seq_file *seq, struct au_sbinfo *sbinfo); | |
30555 | +#else | |
30556 | +AuStubVoid(au_fhsm_wrote, struct super_block *sb, aufs_bindex_t bindex, | |
30557 | + int force) | |
30558 | +AuStubVoid(au_fhsm_wrote_all, struct super_block *sb, int force) | |
30559 | +AuStub(int, au_fhsm_fd, return -EOPNOTSUPP, struct super_block *sb, int oflags) | |
c1595e42 JR |
30560 | +AuStub(pid_t, au_fhsm_pid, return 0, struct au_fhsm *fhsm) |
30561 | +AuStubInt0(au_fhsm_br_alloc, struct au_branch *br) | |
30562 | +AuStubVoid(au_fhsm_set_bottom, struct super_block *sb, aufs_bindex_t bindex) | |
076b876e AM |
30563 | +AuStubVoid(au_fhsm_fin, struct super_block *sb) |
30564 | +AuStubVoid(au_fhsm_init, struct au_sbinfo *sbinfo) | |
30565 | +AuStubVoid(au_fhsm_set, struct au_sbinfo *sbinfo, unsigned int sec) | |
30566 | +AuStubVoid(au_fhsm_show, struct seq_file *seq, struct au_sbinfo *sbinfo) | |
30567 | +#endif | |
30568 | + | |
1facf9fc | 30569 | +/* ---------------------------------------------------------------------- */ |
30570 | + | |
30571 | +static inline struct au_sbinfo *au_sbi(struct super_block *sb) | |
30572 | +{ | |
30573 | + return sb->s_fs_info; | |
30574 | +} | |
30575 | + | |
30576 | +/* ---------------------------------------------------------------------- */ | |
30577 | + | |
30578 | +#ifdef CONFIG_AUFS_EXPORT | |
a2a7ad62 | 30579 | +int au_test_nfsd(void); |
1facf9fc | 30580 | +void au_export_init(struct super_block *sb); |
b752ccd1 | 30581 | +void au_xigen_inc(struct inode *inode); |
1facf9fc | 30582 | +int au_xigen_new(struct inode *inode); |
062440b3 | 30583 | +int au_xigen_set(struct super_block *sb, struct path *path); |
1facf9fc | 30584 | +void au_xigen_clr(struct super_block *sb); |
30585 | + | |
30586 | +static inline int au_busy_or_stale(void) | |
30587 | +{ | |
b752ccd1 | 30588 | + if (!au_test_nfsd()) |
1facf9fc | 30589 | + return -EBUSY; |
30590 | + return -ESTALE; | |
30591 | +} | |
30592 | +#else | |
b752ccd1 | 30593 | +AuStubInt0(au_test_nfsd, void) |
a2a7ad62 | 30594 | +AuStubVoid(au_export_init, struct super_block *sb) |
b752ccd1 | 30595 | +AuStubVoid(au_xigen_inc, struct inode *inode) |
4a4d8108 | 30596 | +AuStubInt0(au_xigen_new, struct inode *inode) |
062440b3 | 30597 | +AuStubInt0(au_xigen_set, struct super_block *sb, struct path *path) |
4a4d8108 | 30598 | +AuStubVoid(au_xigen_clr, struct super_block *sb) |
c1595e42 | 30599 | +AuStub(int, au_busy_or_stale, return -EBUSY, void) |
1facf9fc | 30600 | +#endif /* CONFIG_AUFS_EXPORT */ |
30601 | + | |
30602 | +/* ---------------------------------------------------------------------- */ | |
30603 | + | |
e49829fe JR |
30604 | +#ifdef CONFIG_AUFS_SBILIST |
30605 | +/* module.c */ | |
8b6a4947 | 30606 | +extern struct hlist_bl_head au_sbilist; |
e49829fe JR |
30607 | + |
30608 | +static inline void au_sbilist_init(void) | |
30609 | +{ | |
8b6a4947 | 30610 | + INIT_HLIST_BL_HEAD(&au_sbilist); |
e49829fe JR |
30611 | +} |
30612 | + | |
30613 | +static inline void au_sbilist_add(struct super_block *sb) | |
30614 | +{ | |
8b6a4947 | 30615 | + au_hbl_add(&au_sbi(sb)->si_list, &au_sbilist); |
e49829fe JR |
30616 | +} |
30617 | + | |
30618 | +static inline void au_sbilist_del(struct super_block *sb) | |
30619 | +{ | |
8b6a4947 | 30620 | + au_hbl_del(&au_sbi(sb)->si_list, &au_sbilist); |
e49829fe | 30621 | +} |
53392da6 AM |
30622 | + |
30623 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
30624 | +static inline void au_sbilist_lock(void) | |
30625 | +{ | |
8b6a4947 | 30626 | + hlist_bl_lock(&au_sbilist); |
53392da6 AM |
30627 | +} |
30628 | + | |
30629 | +static inline void au_sbilist_unlock(void) | |
30630 | +{ | |
8b6a4947 | 30631 | + hlist_bl_unlock(&au_sbilist); |
53392da6 AM |
30632 | +} |
30633 | +#define AuGFP_SBILIST GFP_ATOMIC | |
30634 | +#else | |
30635 | +AuStubVoid(au_sbilist_lock, void) | |
30636 | +AuStubVoid(au_sbilist_unlock, void) | |
30637 | +#define AuGFP_SBILIST GFP_NOFS | |
30638 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ | |
e49829fe JR |
30639 | +#else |
30640 | +AuStubVoid(au_sbilist_init, void) | |
c1595e42 JR |
30641 | +AuStubVoid(au_sbilist_add, struct super_block *sb) |
30642 | +AuStubVoid(au_sbilist_del, struct super_block *sb) | |
53392da6 AM |
30643 | +AuStubVoid(au_sbilist_lock, void) |
30644 | +AuStubVoid(au_sbilist_unlock, void) | |
30645 | +#define AuGFP_SBILIST GFP_NOFS | |
e49829fe JR |
30646 | +#endif |
30647 | + | |
30648 | +/* ---------------------------------------------------------------------- */ | |
30649 | + | |
1facf9fc | 30650 | +static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo) |
30651 | +{ | |
dece6358 | 30652 | + /* |
c1595e42 | 30653 | + * This function is a dynamic '__init' function actually, |
dece6358 AM |
30654 | + * so the tiny check for si_rwsem is unnecessary. |
30655 | + */ | |
30656 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
1facf9fc | 30657 | +#ifdef CONFIG_DEBUG_FS |
30658 | + sbinfo->si_dbgaufs = NULL; | |
86dc4139 | 30659 | + sbinfo->si_dbgaufs_plink = NULL; |
1facf9fc | 30660 | + sbinfo->si_dbgaufs_xib = NULL; |
30661 | +#ifdef CONFIG_AUFS_EXPORT | |
30662 | + sbinfo->si_dbgaufs_xigen = NULL; | |
30663 | +#endif | |
30664 | +#endif | |
30665 | +} | |
30666 | + | |
30667 | +/* ---------------------------------------------------------------------- */ | |
30668 | + | |
a2654f78 AM |
30669 | +/* current->atomic_flags */ |
30670 | +/* this value should never corrupt the ones defined in linux/sched.h */ | |
30671 | +#define PFA_AUFS 7 | |
30672 | + | |
30673 | +TASK_PFA_TEST(AUFS, test_aufs) /* task_test_aufs */ | |
30674 | +TASK_PFA_SET(AUFS, aufs) /* task_set_aufs */ | |
30675 | +TASK_PFA_CLEAR(AUFS, aufs) /* task_clear_aufs */ | |
b752ccd1 AM |
30676 | + |
30677 | +static inline int si_pid_test(struct super_block *sb) | |
30678 | +{ | |
a2654f78 | 30679 | + return !!task_test_aufs(current); |
b752ccd1 AM |
30680 | +} |
30681 | + | |
30682 | +static inline void si_pid_clr(struct super_block *sb) | |
30683 | +{ | |
a2654f78 AM |
30684 | + AuDebugOn(!task_test_aufs(current)); |
30685 | + task_clear_aufs(current); | |
b752ccd1 AM |
30686 | +} |
30687 | + | |
a2654f78 AM |
30688 | +static inline void si_pid_set(struct super_block *sb) |
30689 | +{ | |
30690 | + AuDebugOn(task_test_aufs(current)); | |
30691 | + task_set_aufs(current); | |
30692 | +} | |
febd17d6 | 30693 | + |
b752ccd1 AM |
30694 | +/* ---------------------------------------------------------------------- */ |
30695 | + | |
1facf9fc | 30696 | +/* lock superblock. mainly for entry point functions */ |
8b6a4947 AM |
30697 | +#define __si_read_lock(sb) au_rw_read_lock(&au_sbi(sb)->si_rwsem) |
30698 | +#define __si_write_lock(sb) au_rw_write_lock(&au_sbi(sb)->si_rwsem) | |
30699 | +#define __si_read_trylock(sb) au_rw_read_trylock(&au_sbi(sb)->si_rwsem) | |
30700 | +#define __si_write_trylock(sb) au_rw_write_trylock(&au_sbi(sb)->si_rwsem) | |
30701 | +/* | |
30702 | +#define __si_read_trylock_nested(sb) \ | |
30703 | + au_rw_read_trylock_nested(&au_sbi(sb)->si_rwsem) | |
30704 | +#define __si_write_trylock_nested(sb) \ | |
30705 | + au_rw_write_trylock_nested(&au_sbi(sb)->si_rwsem) | |
30706 | +*/ | |
30707 | + | |
30708 | +#define __si_read_unlock(sb) au_rw_read_unlock(&au_sbi(sb)->si_rwsem) | |
30709 | +#define __si_write_unlock(sb) au_rw_write_unlock(&au_sbi(sb)->si_rwsem) | |
30710 | +#define __si_downgrade_lock(sb) au_rw_dgrade_lock(&au_sbi(sb)->si_rwsem) | |
1facf9fc | 30711 | + |
dece6358 AM |
30712 | +#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem) |
30713 | +#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem) | |
30714 | +#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem) | |
30715 | + | |
b752ccd1 AM |
30716 | +static inline void si_noflush_read_lock(struct super_block *sb) |
30717 | +{ | |
30718 | + __si_read_lock(sb); | |
30719 | + si_pid_set(sb); | |
30720 | +} | |
30721 | + | |
30722 | +static inline int si_noflush_read_trylock(struct super_block *sb) | |
30723 | +{ | |
076b876e AM |
30724 | + int locked; |
30725 | + | |
30726 | + locked = __si_read_trylock(sb); | |
b752ccd1 AM |
30727 | + if (locked) |
30728 | + si_pid_set(sb); | |
30729 | + return locked; | |
30730 | +} | |
30731 | + | |
30732 | +static inline void si_noflush_write_lock(struct super_block *sb) | |
30733 | +{ | |
30734 | + __si_write_lock(sb); | |
30735 | + si_pid_set(sb); | |
30736 | +} | |
30737 | + | |
30738 | +static inline int si_noflush_write_trylock(struct super_block *sb) | |
30739 | +{ | |
076b876e AM |
30740 | + int locked; |
30741 | + | |
30742 | + locked = __si_write_trylock(sb); | |
b752ccd1 AM |
30743 | + if (locked) |
30744 | + si_pid_set(sb); | |
30745 | + return locked; | |
30746 | +} | |
30747 | + | |
7e9cd9fe | 30748 | +#if 0 /* reserved */ |
1facf9fc | 30749 | +static inline int si_read_trylock(struct super_block *sb, int flags) |
30750 | +{ | |
30751 | + if (au_ftest_lock(flags, FLUSH)) | |
30752 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
30753 | + return si_noflush_read_trylock(sb); | |
30754 | +} | |
e49829fe | 30755 | +#endif |
1facf9fc | 30756 | + |
b752ccd1 AM |
30757 | +static inline void si_read_unlock(struct super_block *sb) |
30758 | +{ | |
30759 | + si_pid_clr(sb); | |
30760 | + __si_read_unlock(sb); | |
30761 | +} | |
30762 | + | |
7e9cd9fe | 30763 | +#if 0 /* reserved */ |
1facf9fc | 30764 | +static inline int si_write_trylock(struct super_block *sb, int flags) |
30765 | +{ | |
30766 | + if (au_ftest_lock(flags, FLUSH)) | |
30767 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
30768 | + return si_noflush_write_trylock(sb); | |
30769 | +} | |
b752ccd1 AM |
30770 | +#endif |
30771 | + | |
30772 | +static inline void si_write_unlock(struct super_block *sb) | |
30773 | +{ | |
30774 | + si_pid_clr(sb); | |
30775 | + __si_write_unlock(sb); | |
30776 | +} | |
30777 | + | |
7e9cd9fe | 30778 | +#if 0 /* reserved */ |
b752ccd1 AM |
30779 | +static inline void si_downgrade_lock(struct super_block *sb) |
30780 | +{ | |
30781 | + __si_downgrade_lock(sb); | |
30782 | +} | |
30783 | +#endif | |
1facf9fc | 30784 | + |
30785 | +/* ---------------------------------------------------------------------- */ | |
30786 | + | |
5afbbe0d | 30787 | +static inline aufs_bindex_t au_sbbot(struct super_block *sb) |
1facf9fc | 30788 | +{ |
dece6358 | 30789 | + SiMustAnyLock(sb); |
5afbbe0d | 30790 | + return au_sbi(sb)->si_bbot; |
1facf9fc | 30791 | +} |
30792 | + | |
30793 | +static inline unsigned int au_mntflags(struct super_block *sb) | |
30794 | +{ | |
dece6358 | 30795 | + SiMustAnyLock(sb); |
1facf9fc | 30796 | + return au_sbi(sb)->si_mntflags; |
30797 | +} | |
30798 | + | |
30799 | +static inline unsigned int au_sigen(struct super_block *sb) | |
30800 | +{ | |
dece6358 | 30801 | + SiMustAnyLock(sb); |
1facf9fc | 30802 | + return au_sbi(sb)->si_generation; |
30803 | +} | |
30804 | + | |
5afbbe0d AM |
30805 | +static inline unsigned long long au_ninodes(struct super_block *sb) |
30806 | +{ | |
30807 | + s64 n = percpu_counter_sum(&au_sbi(sb)->si_ninodes); | |
30808 | + | |
30809 | + BUG_ON(n < 0); | |
30810 | + return n; | |
30811 | +} | |
30812 | + | |
7f207e10 AM |
30813 | +static inline void au_ninodes_inc(struct super_block *sb) |
30814 | +{ | |
5afbbe0d | 30815 | + percpu_counter_inc(&au_sbi(sb)->si_ninodes); |
7f207e10 AM |
30816 | +} |
30817 | + | |
30818 | +static inline void au_ninodes_dec(struct super_block *sb) | |
30819 | +{ | |
5afbbe0d AM |
30820 | + percpu_counter_dec(&au_sbi(sb)->si_ninodes); |
30821 | +} | |
30822 | + | |
30823 | +static inline unsigned long long au_nfiles(struct super_block *sb) | |
30824 | +{ | |
30825 | + s64 n = percpu_counter_sum(&au_sbi(sb)->si_nfiles); | |
30826 | + | |
30827 | + BUG_ON(n < 0); | |
30828 | + return n; | |
7f207e10 AM |
30829 | +} |
30830 | + | |
30831 | +static inline void au_nfiles_inc(struct super_block *sb) | |
30832 | +{ | |
5afbbe0d | 30833 | + percpu_counter_inc(&au_sbi(sb)->si_nfiles); |
7f207e10 AM |
30834 | +} |
30835 | + | |
30836 | +static inline void au_nfiles_dec(struct super_block *sb) | |
30837 | +{ | |
5afbbe0d | 30838 | + percpu_counter_dec(&au_sbi(sb)->si_nfiles); |
7f207e10 AM |
30839 | +} |
30840 | + | |
1facf9fc | 30841 | +static inline struct au_branch *au_sbr(struct super_block *sb, |
30842 | + aufs_bindex_t bindex) | |
30843 | +{ | |
dece6358 | 30844 | + SiMustAnyLock(sb); |
1facf9fc | 30845 | + return au_sbi(sb)->si_branch[0 + bindex]; |
30846 | +} | |
30847 | + | |
30848 | +static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid) | |
30849 | +{ | |
dece6358 | 30850 | + SiMustWriteLock(sb); |
1facf9fc | 30851 | + au_sbi(sb)->si_xino_brid = brid; |
30852 | +} | |
30853 | + | |
30854 | +static inline aufs_bindex_t au_xino_brid(struct super_block *sb) | |
30855 | +{ | |
dece6358 | 30856 | + SiMustAnyLock(sb); |
1facf9fc | 30857 | + return au_sbi(sb)->si_xino_brid; |
30858 | +} | |
30859 | + | |
30860 | +#endif /* __KERNEL__ */ | |
30861 | +#endif /* __AUFS_SUPER_H__ */ | |
7f207e10 AM |
30862 | diff -urN /usr/share/empty/fs/aufs/sysaufs.c linux/fs/aufs/sysaufs.c |
30863 | --- /usr/share/empty/fs/aufs/sysaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 30864 | +++ linux/fs/aufs/sysaufs.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 30865 | @@ -0,0 +1,93 @@ |
cd7a4cd9 | 30866 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 30867 | +/* |
b00004a5 | 30868 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 30869 | + * |
30870 | + * This program, aufs is free software; you can redistribute it and/or modify | |
30871 | + * it under the terms of the GNU General Public License as published by | |
30872 | + * the Free Software Foundation; either version 2 of the License, or | |
30873 | + * (at your option) any later version. | |
dece6358 AM |
30874 | + * |
30875 | + * This program is distributed in the hope that it will be useful, | |
30876 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30877 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30878 | + * GNU General Public License for more details. | |
30879 | + * | |
30880 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 30881 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 30882 | + */ |
30883 | + | |
30884 | +/* | |
30885 | + * sysfs interface and lifetime management | |
30886 | + * they are necessary regardless sysfs is disabled. | |
30887 | + */ | |
30888 | + | |
1facf9fc | 30889 | +#include <linux/random.h> |
1facf9fc | 30890 | +#include "aufs.h" |
30891 | + | |
30892 | +unsigned long sysaufs_si_mask; | |
e49829fe | 30893 | +struct kset *sysaufs_kset; |
1facf9fc | 30894 | + |
30895 | +#define AuSiAttr(_name) { \ | |
30896 | + .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
30897 | + .show = sysaufs_si_##_name, \ | |
30898 | +} | |
30899 | + | |
30900 | +static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); | |
30901 | +struct attribute *sysaufs_si_attrs[] = { | |
30902 | + &sysaufs_si_attr_xi_path.attr, | |
30903 | + NULL, | |
30904 | +}; | |
30905 | + | |
4a4d8108 | 30906 | +static const struct sysfs_ops au_sbi_ops = { |
1facf9fc | 30907 | + .show = sysaufs_si_show |
30908 | +}; | |
30909 | + | |
30910 | +static struct kobj_type au_sbi_ktype = { | |
30911 | + .release = au_si_free, | |
30912 | + .sysfs_ops = &au_sbi_ops, | |
30913 | + .default_attrs = sysaufs_si_attrs | |
30914 | +}; | |
30915 | + | |
30916 | +/* ---------------------------------------------------------------------- */ | |
30917 | + | |
30918 | +int sysaufs_si_init(struct au_sbinfo *sbinfo) | |
30919 | +{ | |
30920 | + int err; | |
30921 | + | |
e49829fe | 30922 | + sbinfo->si_kobj.kset = sysaufs_kset; |
1facf9fc | 30923 | + /* cf. sysaufs_name() */ |
30924 | + err = kobject_init_and_add | |
e49829fe | 30925 | + (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL, |
1facf9fc | 30926 | + SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); |
30927 | + | |
1facf9fc | 30928 | + return err; |
30929 | +} | |
30930 | + | |
30931 | +void sysaufs_fin(void) | |
30932 | +{ | |
e49829fe JR |
30933 | + sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
30934 | + kset_unregister(sysaufs_kset); | |
1facf9fc | 30935 | +} |
30936 | + | |
30937 | +int __init sysaufs_init(void) | |
30938 | +{ | |
30939 | + int err; | |
30940 | + | |
30941 | + do { | |
30942 | + get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); | |
30943 | + } while (!sysaufs_si_mask); | |
30944 | + | |
4a4d8108 | 30945 | + err = -EINVAL; |
e49829fe JR |
30946 | + sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); |
30947 | + if (unlikely(!sysaufs_kset)) | |
4a4d8108 | 30948 | + goto out; |
e49829fe JR |
30949 | + err = PTR_ERR(sysaufs_kset); |
30950 | + if (IS_ERR(sysaufs_kset)) | |
1facf9fc | 30951 | + goto out; |
e49829fe | 30952 | + err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
062440b3 | 30953 | + if (unlikely(err)) |
e49829fe | 30954 | + kset_unregister(sysaufs_kset); |
1facf9fc | 30955 | + |
4f0767ce | 30956 | +out: |
1facf9fc | 30957 | + return err; |
30958 | +} | |
7f207e10 AM |
30959 | diff -urN /usr/share/empty/fs/aufs/sysaufs.h linux/fs/aufs/sysaufs.h |
30960 | --- /usr/share/empty/fs/aufs/sysaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 30961 | +++ linux/fs/aufs/sysaufs.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
30962 | @@ -0,0 +1,102 @@ |
30963 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 30964 | +/* |
b00004a5 | 30965 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 30966 | + * |
30967 | + * This program, aufs is free software; you can redistribute it and/or modify | |
30968 | + * it under the terms of the GNU General Public License as published by | |
30969 | + * the Free Software Foundation; either version 2 of the License, or | |
30970 | + * (at your option) any later version. | |
dece6358 AM |
30971 | + * |
30972 | + * This program is distributed in the hope that it will be useful, | |
30973 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30974 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30975 | + * GNU General Public License for more details. | |
30976 | + * | |
30977 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 30978 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 30979 | + */ |
30980 | + | |
30981 | +/* | |
30982 | + * sysfs interface and mount lifetime management | |
30983 | + */ | |
30984 | + | |
30985 | +#ifndef __SYSAUFS_H__ | |
30986 | +#define __SYSAUFS_H__ | |
30987 | + | |
30988 | +#ifdef __KERNEL__ | |
30989 | + | |
1facf9fc | 30990 | +#include <linux/sysfs.h> |
1facf9fc | 30991 | +#include "module.h" |
30992 | + | |
dece6358 AM |
30993 | +struct super_block; |
30994 | +struct au_sbinfo; | |
30995 | + | |
1facf9fc | 30996 | +struct sysaufs_si_attr { |
30997 | + struct attribute attr; | |
30998 | + int (*show)(struct seq_file *seq, struct super_block *sb); | |
30999 | +}; | |
31000 | + | |
31001 | +/* ---------------------------------------------------------------------- */ | |
31002 | + | |
31003 | +/* sysaufs.c */ | |
31004 | +extern unsigned long sysaufs_si_mask; | |
e49829fe | 31005 | +extern struct kset *sysaufs_kset; |
1facf9fc | 31006 | +extern struct attribute *sysaufs_si_attrs[]; |
31007 | +int sysaufs_si_init(struct au_sbinfo *sbinfo); | |
31008 | +int __init sysaufs_init(void); | |
31009 | +void sysaufs_fin(void); | |
31010 | + | |
31011 | +/* ---------------------------------------------------------------------- */ | |
31012 | + | |
31013 | +/* some people doesn't like to show a pointer in kernel */ | |
31014 | +static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) | |
31015 | +{ | |
31016 | + return sysaufs_si_mask ^ (unsigned long)sbinfo; | |
31017 | +} | |
31018 | + | |
31019 | +#define SysaufsSiNamePrefix "si_" | |
31020 | +#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) | |
31021 | +static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) | |
31022 | +{ | |
31023 | + snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", | |
31024 | + sysaufs_si_id(sbinfo)); | |
31025 | +} | |
31026 | + | |
31027 | +struct au_branch; | |
31028 | +#ifdef CONFIG_SYSFS | |
31029 | +/* sysfs.c */ | |
31030 | +extern struct attribute_group *sysaufs_attr_group; | |
31031 | + | |
31032 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); | |
31033 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
31034 | + char *buf); | |
076b876e AM |
31035 | +long au_brinfo_ioctl(struct file *file, unsigned long arg); |
31036 | +#ifdef CONFIG_COMPAT | |
31037 | +long au_brinfo_compat_ioctl(struct file *file, unsigned long arg); | |
31038 | +#endif | |
1facf9fc | 31039 | + |
31040 | +void sysaufs_br_init(struct au_branch *br); | |
31041 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
31042 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
31043 | + | |
31044 | +#define sysaufs_brs_init() do {} while (0) | |
31045 | + | |
31046 | +#else | |
31047 | +#define sysaufs_attr_group NULL | |
31048 | + | |
4a4d8108 | 31049 | +AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) |
c1595e42 JR |
31050 | +AuStub(ssize_t, sysaufs_si_show, return 0, struct kobject *kobj, |
31051 | + struct attribute *attr, char *buf) | |
4a4d8108 AM |
31052 | +AuStubVoid(sysaufs_br_init, struct au_branch *br) |
31053 | +AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
31054 | +AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) | |
1facf9fc | 31055 | + |
31056 | +static inline void sysaufs_brs_init(void) | |
31057 | +{ | |
31058 | + sysaufs_brs = 0; | |
31059 | +} | |
31060 | + | |
31061 | +#endif /* CONFIG_SYSFS */ | |
31062 | + | |
31063 | +#endif /* __KERNEL__ */ | |
31064 | +#endif /* __SYSAUFS_H__ */ | |
7f207e10 AM |
31065 | diff -urN /usr/share/empty/fs/aufs/sysfs.c linux/fs/aufs/sysfs.c |
31066 | --- /usr/share/empty/fs/aufs/sysfs.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 31067 | +++ linux/fs/aufs/sysfs.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 31068 | @@ -0,0 +1,373 @@ |
cd7a4cd9 | 31069 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31070 | +/* |
b00004a5 | 31071 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 31072 | + * |
31073 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31074 | + * it under the terms of the GNU General Public License as published by | |
31075 | + * the Free Software Foundation; either version 2 of the License, or | |
31076 | + * (at your option) any later version. | |
dece6358 AM |
31077 | + * |
31078 | + * This program is distributed in the hope that it will be useful, | |
31079 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31080 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31081 | + * GNU General Public License for more details. | |
31082 | + * | |
31083 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31084 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31085 | + */ |
31086 | + | |
31087 | +/* | |
31088 | + * sysfs interface | |
31089 | + */ | |
31090 | + | |
076b876e | 31091 | +#include <linux/compat.h> |
1facf9fc | 31092 | +#include <linux/seq_file.h> |
1facf9fc | 31093 | +#include "aufs.h" |
31094 | + | |
4a4d8108 AM |
31095 | +#ifdef CONFIG_AUFS_FS_MODULE |
31096 | +/* this entry violates the "one line per file" policy of sysfs */ | |
31097 | +static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, | |
31098 | + char *buf) | |
31099 | +{ | |
31100 | + ssize_t err; | |
31101 | + static char *conf = | |
31102 | +/* this file is generated at compiling */ | |
31103 | +#include "conf.str" | |
31104 | + ; | |
31105 | + | |
31106 | + err = snprintf(buf, PAGE_SIZE, conf); | |
31107 | + if (unlikely(err >= PAGE_SIZE)) | |
31108 | + err = -EFBIG; | |
31109 | + return err; | |
31110 | +} | |
31111 | + | |
31112 | +static struct kobj_attribute au_config_attr = __ATTR_RO(config); | |
31113 | +#endif | |
31114 | + | |
1facf9fc | 31115 | +static struct attribute *au_attr[] = { |
4a4d8108 AM |
31116 | +#ifdef CONFIG_AUFS_FS_MODULE |
31117 | + &au_config_attr.attr, | |
31118 | +#endif | |
1facf9fc | 31119 | + NULL, /* need to NULL terminate the list of attributes */ |
31120 | +}; | |
31121 | + | |
31122 | +static struct attribute_group sysaufs_attr_group_body = { | |
31123 | + .attrs = au_attr | |
31124 | +}; | |
31125 | + | |
31126 | +struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body; | |
31127 | + | |
31128 | +/* ---------------------------------------------------------------------- */ | |
31129 | + | |
31130 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb) | |
31131 | +{ | |
31132 | + int err; | |
31133 | + | |
dece6358 AM |
31134 | + SiMustAnyLock(sb); |
31135 | + | |
1facf9fc | 31136 | + err = 0; |
31137 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
31138 | + err = au_xino_path(seq, au_sbi(sb)->si_xib); | |
31139 | + seq_putc(seq, '\n'); | |
31140 | + } | |
31141 | + return err; | |
31142 | +} | |
31143 | + | |
31144 | +/* | |
31145 | + * the lifetime of branch is independent from the entry under sysfs. | |
31146 | + * sysfs handles the lifetime of the entry, and never call ->show() after it is | |
31147 | + * unlinked. | |
31148 | + */ | |
31149 | +static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb, | |
392086de | 31150 | + aufs_bindex_t bindex, int idx) |
1facf9fc | 31151 | +{ |
1e00d052 | 31152 | + int err; |
1facf9fc | 31153 | + struct path path; |
31154 | + struct dentry *root; | |
31155 | + struct au_branch *br; | |
076b876e | 31156 | + au_br_perm_str_t perm; |
1facf9fc | 31157 | + |
31158 | + AuDbg("b%d\n", bindex); | |
31159 | + | |
1e00d052 | 31160 | + err = 0; |
1facf9fc | 31161 | + root = sb->s_root; |
31162 | + di_read_lock_parent(root, !AuLock_IR); | |
31163 | + br = au_sbr(sb, bindex); | |
392086de AM |
31164 | + |
31165 | + switch (idx) { | |
31166 | + case AuBrSysfs_BR: | |
31167 | + path.mnt = au_br_mnt(br); | |
31168 | + path.dentry = au_h_dptr(root, bindex); | |
79b8bda9 AM |
31169 | + err = au_seq_path(seq, &path); |
31170 | + if (!err) { | |
31171 | + au_optstr_br_perm(&perm, br->br_perm); | |
31172 | + seq_printf(seq, "=%s\n", perm.a); | |
31173 | + } | |
392086de AM |
31174 | + break; |
31175 | + case AuBrSysfs_BRID: | |
79b8bda9 | 31176 | + seq_printf(seq, "%d\n", br->br_id); |
392086de AM |
31177 | + break; |
31178 | + } | |
076b876e | 31179 | + di_read_unlock(root, !AuLock_IR); |
79b8bda9 | 31180 | + if (unlikely(err || seq_has_overflowed(seq))) |
076b876e | 31181 | + err = -E2BIG; |
392086de | 31182 | + |
1e00d052 | 31183 | + return err; |
1facf9fc | 31184 | +} |
31185 | + | |
31186 | +/* ---------------------------------------------------------------------- */ | |
31187 | + | |
31188 | +static struct seq_file *au_seq(char *p, ssize_t len) | |
31189 | +{ | |
31190 | + struct seq_file *seq; | |
31191 | + | |
31192 | + seq = kzalloc(sizeof(*seq), GFP_NOFS); | |
31193 | + if (seq) { | |
31194 | + /* mutex_init(&seq.lock); */ | |
31195 | + seq->buf = p; | |
31196 | + seq->size = len; | |
31197 | + return seq; /* success */ | |
31198 | + } | |
31199 | + | |
31200 | + seq = ERR_PTR(-ENOMEM); | |
31201 | + return seq; | |
31202 | +} | |
31203 | + | |
392086de AM |
31204 | +#define SysaufsBr_PREFIX "br" |
31205 | +#define SysaufsBrid_PREFIX "brid" | |
1facf9fc | 31206 | + |
31207 | +/* todo: file size may exceed PAGE_SIZE */ | |
31208 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
1308ab2a | 31209 | + char *buf) |
1facf9fc | 31210 | +{ |
31211 | + ssize_t err; | |
392086de | 31212 | + int idx; |
1facf9fc | 31213 | + long l; |
5afbbe0d | 31214 | + aufs_bindex_t bbot; |
1facf9fc | 31215 | + struct au_sbinfo *sbinfo; |
31216 | + struct super_block *sb; | |
31217 | + struct seq_file *seq; | |
31218 | + char *name; | |
31219 | + struct attribute **cattr; | |
31220 | + | |
31221 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
31222 | + sb = sbinfo->si_sb; | |
1308ab2a | 31223 | + |
31224 | + /* | |
31225 | + * prevent a race condition between sysfs and aufs. | |
31226 | + * for instance, sysfs_file_read() calls sysfs_get_active_two() which | |
31227 | + * prohibits maintaining the sysfs entries. | |
31228 | + * hew we acquire read lock after sysfs_get_active_two(). | |
31229 | + * on the other hand, the remount process may maintain the sysfs/aufs | |
31230 | + * entries after acquiring write lock. | |
31231 | + * it can cause a deadlock. | |
31232 | + * simply we gave up processing read here. | |
31233 | + */ | |
31234 | + err = -EBUSY; | |
31235 | + if (unlikely(!si_noflush_read_trylock(sb))) | |
31236 | + goto out; | |
1facf9fc | 31237 | + |
31238 | + seq = au_seq(buf, PAGE_SIZE); | |
31239 | + err = PTR_ERR(seq); | |
31240 | + if (IS_ERR(seq)) | |
1308ab2a | 31241 | + goto out_unlock; |
1facf9fc | 31242 | + |
31243 | + name = (void *)attr->name; | |
31244 | + cattr = sysaufs_si_attrs; | |
31245 | + while (*cattr) { | |
31246 | + if (!strcmp(name, (*cattr)->name)) { | |
31247 | + err = container_of(*cattr, struct sysaufs_si_attr, attr) | |
31248 | + ->show(seq, sb); | |
31249 | + goto out_seq; | |
31250 | + } | |
31251 | + cattr++; | |
31252 | + } | |
31253 | + | |
392086de AM |
31254 | + if (!strncmp(name, SysaufsBrid_PREFIX, |
31255 | + sizeof(SysaufsBrid_PREFIX) - 1)) { | |
31256 | + idx = AuBrSysfs_BRID; | |
31257 | + name += sizeof(SysaufsBrid_PREFIX) - 1; | |
31258 | + } else if (!strncmp(name, SysaufsBr_PREFIX, | |
31259 | + sizeof(SysaufsBr_PREFIX) - 1)) { | |
31260 | + idx = AuBrSysfs_BR; | |
1facf9fc | 31261 | + name += sizeof(SysaufsBr_PREFIX) - 1; |
392086de AM |
31262 | + } else |
31263 | + BUG(); | |
31264 | + | |
31265 | + err = kstrtol(name, 10, &l); | |
31266 | + if (!err) { | |
5afbbe0d AM |
31267 | + bbot = au_sbbot(sb); |
31268 | + if (l <= bbot) | |
392086de AM |
31269 | + err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l, idx); |
31270 | + else | |
31271 | + err = -ENOENT; | |
1facf9fc | 31272 | + } |
1facf9fc | 31273 | + |
4f0767ce | 31274 | +out_seq: |
1facf9fc | 31275 | + if (!err) { |
31276 | + err = seq->count; | |
31277 | + /* sysfs limit */ | |
31278 | + if (unlikely(err == PAGE_SIZE)) | |
31279 | + err = -EFBIG; | |
31280 | + } | |
1c60b727 | 31281 | + kfree(seq); |
4f0767ce | 31282 | +out_unlock: |
1facf9fc | 31283 | + si_read_unlock(sb); |
4f0767ce | 31284 | +out: |
1facf9fc | 31285 | + return err; |
31286 | +} | |
31287 | + | |
31288 | +/* ---------------------------------------------------------------------- */ | |
31289 | + | |
076b876e AM |
31290 | +static int au_brinfo(struct super_block *sb, union aufs_brinfo __user *arg) |
31291 | +{ | |
31292 | + int err; | |
31293 | + int16_t brid; | |
5afbbe0d | 31294 | + aufs_bindex_t bindex, bbot; |
076b876e AM |
31295 | + size_t sz; |
31296 | + char *buf; | |
31297 | + struct seq_file *seq; | |
31298 | + struct au_branch *br; | |
31299 | + | |
31300 | + si_read_lock(sb, AuLock_FLUSH); | |
5afbbe0d AM |
31301 | + bbot = au_sbbot(sb); |
31302 | + err = bbot + 1; | |
076b876e AM |
31303 | + if (!arg) |
31304 | + goto out; | |
31305 | + | |
31306 | + err = -ENOMEM; | |
31307 | + buf = (void *)__get_free_page(GFP_NOFS); | |
31308 | + if (unlikely(!buf)) | |
31309 | + goto out; | |
31310 | + | |
31311 | + seq = au_seq(buf, PAGE_SIZE); | |
31312 | + err = PTR_ERR(seq); | |
31313 | + if (IS_ERR(seq)) | |
31314 | + goto out_buf; | |
31315 | + | |
31316 | + sz = sizeof(*arg) - offsetof(union aufs_brinfo, path); | |
5afbbe0d | 31317 | + for (bindex = 0; bindex <= bbot; bindex++, arg++) { |
076b876e AM |
31318 | + err = !access_ok(VERIFY_WRITE, arg, sizeof(*arg)); |
31319 | + if (unlikely(err)) | |
31320 | + break; | |
31321 | + | |
31322 | + br = au_sbr(sb, bindex); | |
31323 | + brid = br->br_id; | |
31324 | + BUILD_BUG_ON(sizeof(brid) != sizeof(arg->id)); | |
31325 | + err = __put_user(brid, &arg->id); | |
31326 | + if (unlikely(err)) | |
31327 | + break; | |
31328 | + | |
31329 | + BUILD_BUG_ON(sizeof(br->br_perm) != sizeof(arg->perm)); | |
31330 | + err = __put_user(br->br_perm, &arg->perm); | |
31331 | + if (unlikely(err)) | |
31332 | + break; | |
31333 | + | |
79b8bda9 AM |
31334 | + err = au_seq_path(seq, &br->br_path); |
31335 | + if (unlikely(err)) | |
31336 | + break; | |
31337 | + seq_putc(seq, '\0'); | |
31338 | + if (!seq_has_overflowed(seq)) { | |
076b876e AM |
31339 | + err = copy_to_user(arg->path, seq->buf, seq->count); |
31340 | + seq->count = 0; | |
31341 | + if (unlikely(err)) | |
31342 | + break; | |
31343 | + } else { | |
31344 | + err = -E2BIG; | |
31345 | + goto out_seq; | |
31346 | + } | |
31347 | + } | |
31348 | + if (unlikely(err)) | |
31349 | + err = -EFAULT; | |
31350 | + | |
31351 | +out_seq: | |
1c60b727 | 31352 | + kfree(seq); |
076b876e | 31353 | +out_buf: |
1c60b727 | 31354 | + free_page((unsigned long)buf); |
076b876e AM |
31355 | +out: |
31356 | + si_read_unlock(sb); | |
31357 | + return err; | |
31358 | +} | |
31359 | + | |
31360 | +long au_brinfo_ioctl(struct file *file, unsigned long arg) | |
31361 | +{ | |
2000de60 | 31362 | + return au_brinfo(file->f_path.dentry->d_sb, (void __user *)arg); |
076b876e AM |
31363 | +} |
31364 | + | |
31365 | +#ifdef CONFIG_COMPAT | |
31366 | +long au_brinfo_compat_ioctl(struct file *file, unsigned long arg) | |
31367 | +{ | |
2000de60 | 31368 | + return au_brinfo(file->f_path.dentry->d_sb, compat_ptr(arg)); |
076b876e AM |
31369 | +} |
31370 | +#endif | |
31371 | + | |
31372 | +/* ---------------------------------------------------------------------- */ | |
31373 | + | |
1facf9fc | 31374 | +void sysaufs_br_init(struct au_branch *br) |
31375 | +{ | |
392086de AM |
31376 | + int i; |
31377 | + struct au_brsysfs *br_sysfs; | |
31378 | + struct attribute *attr; | |
4a4d8108 | 31379 | + |
392086de AM |
31380 | + br_sysfs = br->br_sysfs; |
31381 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31382 | + attr = &br_sysfs->attr; | |
31383 | + sysfs_attr_init(attr); | |
31384 | + attr->name = br_sysfs->name; | |
cd7a4cd9 | 31385 | + attr->mode = 0444; |
392086de AM |
31386 | + br_sysfs++; |
31387 | + } | |
1facf9fc | 31388 | +} |
31389 | + | |
31390 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
31391 | +{ | |
31392 | + struct au_branch *br; | |
31393 | + struct kobject *kobj; | |
392086de AM |
31394 | + struct au_brsysfs *br_sysfs; |
31395 | + int i; | |
5afbbe0d | 31396 | + aufs_bindex_t bbot; |
1facf9fc | 31397 | + |
1facf9fc | 31398 | + if (!sysaufs_brs) |
31399 | + return; | |
31400 | + | |
31401 | + kobj = &au_sbi(sb)->si_kobj; | |
5afbbe0d AM |
31402 | + bbot = au_sbbot(sb); |
31403 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 31404 | + br = au_sbr(sb, bindex); |
392086de AM |
31405 | + br_sysfs = br->br_sysfs; |
31406 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31407 | + sysfs_remove_file(kobj, &br_sysfs->attr); | |
31408 | + br_sysfs++; | |
31409 | + } | |
1facf9fc | 31410 | + } |
31411 | +} | |
31412 | + | |
31413 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
31414 | +{ | |
392086de | 31415 | + int err, i; |
5afbbe0d | 31416 | + aufs_bindex_t bbot; |
1facf9fc | 31417 | + struct kobject *kobj; |
31418 | + struct au_branch *br; | |
392086de | 31419 | + struct au_brsysfs *br_sysfs; |
1facf9fc | 31420 | + |
1facf9fc | 31421 | + if (!sysaufs_brs) |
31422 | + return; | |
31423 | + | |
31424 | + kobj = &au_sbi(sb)->si_kobj; | |
5afbbe0d AM |
31425 | + bbot = au_sbbot(sb); |
31426 | + for (; bindex <= bbot; bindex++) { | |
1facf9fc | 31427 | + br = au_sbr(sb, bindex); |
392086de AM |
31428 | + br_sysfs = br->br_sysfs; |
31429 | + snprintf(br_sysfs[AuBrSysfs_BR].name, sizeof(br_sysfs->name), | |
31430 | + SysaufsBr_PREFIX "%d", bindex); | |
31431 | + snprintf(br_sysfs[AuBrSysfs_BRID].name, sizeof(br_sysfs->name), | |
31432 | + SysaufsBrid_PREFIX "%d", bindex); | |
31433 | + for (i = 0; i < ARRAY_SIZE(br->br_sysfs); i++) { | |
31434 | + err = sysfs_create_file(kobj, &br_sysfs->attr); | |
31435 | + if (unlikely(err)) | |
31436 | + pr_warn("failed %s under sysfs(%d)\n", | |
31437 | + br_sysfs->name, err); | |
31438 | + br_sysfs++; | |
31439 | + } | |
1facf9fc | 31440 | + } |
31441 | +} | |
7f207e10 AM |
31442 | diff -urN /usr/share/empty/fs/aufs/sysrq.c linux/fs/aufs/sysrq.c |
31443 | --- /usr/share/empty/fs/aufs/sysrq.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 31444 | +++ linux/fs/aufs/sysrq.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 31445 | @@ -0,0 +1,160 @@ |
cd7a4cd9 | 31446 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31447 | +/* |
b00004a5 | 31448 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 31449 | + * |
31450 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31451 | + * it under the terms of the GNU General Public License as published by | |
31452 | + * the Free Software Foundation; either version 2 of the License, or | |
31453 | + * (at your option) any later version. | |
dece6358 AM |
31454 | + * |
31455 | + * This program is distributed in the hope that it will be useful, | |
31456 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31457 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31458 | + * GNU General Public License for more details. | |
31459 | + * | |
31460 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31461 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31462 | + */ |
31463 | + | |
31464 | +/* | |
31465 | + * magic sysrq hanlder | |
31466 | + */ | |
31467 | + | |
1facf9fc | 31468 | +/* #include <linux/sysrq.h> */ |
027c5e7a | 31469 | +#include <linux/writeback.h> |
1facf9fc | 31470 | +#include "aufs.h" |
31471 | + | |
31472 | +/* ---------------------------------------------------------------------- */ | |
31473 | + | |
31474 | +static void sysrq_sb(struct super_block *sb) | |
31475 | +{ | |
31476 | + char *plevel; | |
31477 | + struct au_sbinfo *sbinfo; | |
31478 | + struct file *file; | |
8b6a4947 AM |
31479 | + struct hlist_bl_head *files; |
31480 | + struct hlist_bl_node *pos; | |
523b37e3 | 31481 | + struct au_finfo *finfo; |
1facf9fc | 31482 | + |
31483 | + plevel = au_plevel; | |
31484 | + au_plevel = KERN_WARNING; | |
1facf9fc | 31485 | + |
4a4d8108 | 31486 | + /* since we define pr_fmt, call printk directly */ |
c06a8ce3 AM |
31487 | +#define pr(str) printk(KERN_WARNING AUFS_NAME ": " str) |
31488 | + | |
31489 | + sbinfo = au_sbi(sb); | |
4a4d8108 | 31490 | + printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo)); |
c06a8ce3 | 31491 | + pr("superblock\n"); |
1facf9fc | 31492 | + au_dpri_sb(sb); |
027c5e7a AM |
31493 | + |
31494 | +#if 0 | |
c06a8ce3 | 31495 | + pr("root dentry\n"); |
1facf9fc | 31496 | + au_dpri_dentry(sb->s_root); |
c06a8ce3 | 31497 | + pr("root inode\n"); |
5527c038 | 31498 | + au_dpri_inode(d_inode(sb->s_root)); |
027c5e7a AM |
31499 | +#endif |
31500 | + | |
1facf9fc | 31501 | +#if 0 |
027c5e7a AM |
31502 | + do { |
31503 | + int err, i, j, ndentry; | |
31504 | + struct au_dcsub_pages dpages; | |
31505 | + struct au_dpage *dpage; | |
31506 | + | |
31507 | + err = au_dpages_init(&dpages, GFP_ATOMIC); | |
31508 | + if (unlikely(err)) | |
31509 | + break; | |
31510 | + err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL); | |
31511 | + if (!err) | |
31512 | + for (i = 0; i < dpages.ndpage; i++) { | |
31513 | + dpage = dpages.dpages + i; | |
31514 | + ndentry = dpage->ndentry; | |
31515 | + for (j = 0; j < ndentry; j++) | |
31516 | + au_dpri_dentry(dpage->dentries[j]); | |
31517 | + } | |
31518 | + au_dpages_free(&dpages); | |
31519 | + } while (0); | |
31520 | +#endif | |
31521 | + | |
31522 | +#if 1 | |
31523 | + { | |
31524 | + struct inode *i; | |
076b876e | 31525 | + |
c06a8ce3 | 31526 | + pr("isolated inode\n"); |
79b8bda9 | 31527 | + spin_lock(&sb->s_inode_list_lock); |
2cbb1c4b JR |
31528 | + list_for_each_entry(i, &sb->s_inodes, i_sb_list) { |
31529 | + spin_lock(&i->i_lock); | |
b4510431 | 31530 | + if (1 || hlist_empty(&i->i_dentry)) |
027c5e7a | 31531 | + au_dpri_inode(i); |
2cbb1c4b JR |
31532 | + spin_unlock(&i->i_lock); |
31533 | + } | |
79b8bda9 | 31534 | + spin_unlock(&sb->s_inode_list_lock); |
027c5e7a | 31535 | + } |
1facf9fc | 31536 | +#endif |
c06a8ce3 | 31537 | + pr("files\n"); |
523b37e3 | 31538 | + files = &au_sbi(sb)->si_files; |
8b6a4947 AM |
31539 | + hlist_bl_lock(files); |
31540 | + hlist_bl_for_each_entry(finfo, pos, files, fi_hlist) { | |
4a4d8108 | 31541 | + umode_t mode; |
076b876e | 31542 | + |
523b37e3 | 31543 | + file = finfo->fi_file; |
c06a8ce3 | 31544 | + mode = file_inode(file)->i_mode; |
38d290e6 | 31545 | + if (!special_file(mode)) |
1facf9fc | 31546 | + au_dpri_file(file); |
523b37e3 | 31547 | + } |
8b6a4947 | 31548 | + hlist_bl_unlock(files); |
c06a8ce3 | 31549 | + pr("done\n"); |
1facf9fc | 31550 | + |
c06a8ce3 | 31551 | +#undef pr |
1facf9fc | 31552 | + au_plevel = plevel; |
1facf9fc | 31553 | +} |
31554 | + | |
31555 | +/* ---------------------------------------------------------------------- */ | |
31556 | + | |
31557 | +/* module parameter */ | |
31558 | +static char *aufs_sysrq_key = "a"; | |
cd7a4cd9 | 31559 | +module_param_named(sysrq, aufs_sysrq_key, charp, 0444); |
1facf9fc | 31560 | +MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME); |
31561 | + | |
0c5527e5 | 31562 | +static void au_sysrq(int key __maybe_unused) |
1facf9fc | 31563 | +{ |
1facf9fc | 31564 | + struct au_sbinfo *sbinfo; |
8b6a4947 | 31565 | + struct hlist_bl_node *pos; |
1facf9fc | 31566 | + |
027c5e7a | 31567 | + lockdep_off(); |
53392da6 | 31568 | + au_sbilist_lock(); |
8b6a4947 | 31569 | + hlist_bl_for_each_entry(sbinfo, pos, &au_sbilist, si_list) |
1facf9fc | 31570 | + sysrq_sb(sbinfo->si_sb); |
53392da6 | 31571 | + au_sbilist_unlock(); |
027c5e7a | 31572 | + lockdep_on(); |
1facf9fc | 31573 | +} |
31574 | + | |
31575 | +static struct sysrq_key_op au_sysrq_op = { | |
31576 | + .handler = au_sysrq, | |
31577 | + .help_msg = "Aufs", | |
31578 | + .action_msg = "Aufs", | |
31579 | + .enable_mask = SYSRQ_ENABLE_DUMP | |
31580 | +}; | |
31581 | + | |
31582 | +/* ---------------------------------------------------------------------- */ | |
31583 | + | |
31584 | +int __init au_sysrq_init(void) | |
31585 | +{ | |
31586 | + int err; | |
31587 | + char key; | |
31588 | + | |
31589 | + err = -1; | |
31590 | + key = *aufs_sysrq_key; | |
31591 | + if ('a' <= key && key <= 'z') | |
31592 | + err = register_sysrq_key(key, &au_sysrq_op); | |
31593 | + if (unlikely(err)) | |
4a4d8108 | 31594 | + pr_err("err %d, sysrq=%c\n", err, key); |
1facf9fc | 31595 | + return err; |
31596 | +} | |
31597 | + | |
31598 | +void au_sysrq_fin(void) | |
31599 | +{ | |
31600 | + int err; | |
076b876e | 31601 | + |
1facf9fc | 31602 | + err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op); |
31603 | + if (unlikely(err)) | |
4a4d8108 | 31604 | + pr_err("err %d (ignored)\n", err); |
1facf9fc | 31605 | +} |
7f207e10 AM |
31606 | diff -urN /usr/share/empty/fs/aufs/vdir.c linux/fs/aufs/vdir.c |
31607 | --- /usr/share/empty/fs/aufs/vdir.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 31608 | +++ linux/fs/aufs/vdir.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 31609 | @@ -0,0 +1,894 @@ |
cd7a4cd9 | 31610 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 31611 | +/* |
b00004a5 | 31612 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 31613 | + * |
31614 | + * This program, aufs is free software; you can redistribute it and/or modify | |
31615 | + * it under the terms of the GNU General Public License as published by | |
31616 | + * the Free Software Foundation; either version 2 of the License, or | |
31617 | + * (at your option) any later version. | |
dece6358 AM |
31618 | + * |
31619 | + * This program is distributed in the hope that it will be useful, | |
31620 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
31621 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
31622 | + * GNU General Public License for more details. | |
31623 | + * | |
31624 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 31625 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 31626 | + */ |
31627 | + | |
31628 | +/* | |
31629 | + * virtual or vertical directory | |
31630 | + */ | |
31631 | + | |
31632 | +#include "aufs.h" | |
31633 | + | |
dece6358 | 31634 | +static unsigned int calc_size(int nlen) |
1facf9fc | 31635 | +{ |
dece6358 | 31636 | + return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t)); |
1facf9fc | 31637 | +} |
31638 | + | |
31639 | +static int set_deblk_end(union au_vdir_deblk_p *p, | |
31640 | + union au_vdir_deblk_p *deblk_end) | |
31641 | +{ | |
31642 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) { | |
31643 | + p->de->de_str.len = 0; | |
31644 | + /* smp_mb(); */ | |
31645 | + return 0; | |
31646 | + } | |
31647 | + return -1; /* error */ | |
31648 | +} | |
31649 | + | |
31650 | +/* returns true or false */ | |
31651 | +static int is_deblk_end(union au_vdir_deblk_p *p, | |
31652 | + union au_vdir_deblk_p *deblk_end) | |
31653 | +{ | |
31654 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) | |
31655 | + return !p->de->de_str.len; | |
31656 | + return 1; | |
31657 | +} | |
31658 | + | |
31659 | +static unsigned char *last_deblk(struct au_vdir *vdir) | |
31660 | +{ | |
31661 | + return vdir->vd_deblk[vdir->vd_nblk - 1]; | |
31662 | +} | |
31663 | + | |
31664 | +/* ---------------------------------------------------------------------- */ | |
31665 | + | |
79b8bda9 | 31666 | +/* estimate the appropriate size for name hash table */ |
1308ab2a | 31667 | +unsigned int au_rdhash_est(loff_t sz) |
31668 | +{ | |
31669 | + unsigned int n; | |
31670 | + | |
31671 | + n = UINT_MAX; | |
31672 | + sz >>= 10; | |
31673 | + if (sz < n) | |
31674 | + n = sz; | |
31675 | + if (sz < AUFS_RDHASH_DEF) | |
31676 | + n = AUFS_RDHASH_DEF; | |
4a4d8108 | 31677 | + /* pr_info("n %u\n", n); */ |
1308ab2a | 31678 | + return n; |
31679 | +} | |
31680 | + | |
1facf9fc | 31681 | +/* |
31682 | + * the allocated memory has to be freed by | |
dece6358 | 31683 | + * au_nhash_wh_free() or au_nhash_de_free(). |
1facf9fc | 31684 | + */ |
dece6358 | 31685 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp) |
1facf9fc | 31686 | +{ |
1facf9fc | 31687 | + struct hlist_head *head; |
dece6358 | 31688 | + unsigned int u; |
076b876e | 31689 | + size_t sz; |
1facf9fc | 31690 | + |
076b876e AM |
31691 | + sz = sizeof(*nhash->nh_head) * num_hash; |
31692 | + head = kmalloc(sz, gfp); | |
dece6358 AM |
31693 | + if (head) { |
31694 | + nhash->nh_num = num_hash; | |
31695 | + nhash->nh_head = head; | |
31696 | + for (u = 0; u < num_hash; u++) | |
1facf9fc | 31697 | + INIT_HLIST_HEAD(head++); |
dece6358 | 31698 | + return 0; /* success */ |
1facf9fc | 31699 | + } |
1facf9fc | 31700 | + |
dece6358 | 31701 | + return -ENOMEM; |
1facf9fc | 31702 | +} |
31703 | + | |
dece6358 AM |
31704 | +static void nhash_count(struct hlist_head *head) |
31705 | +{ | |
31706 | +#if 0 | |
31707 | + unsigned long n; | |
31708 | + struct hlist_node *pos; | |
31709 | + | |
31710 | + n = 0; | |
31711 | + hlist_for_each(pos, head) | |
31712 | + n++; | |
4a4d8108 | 31713 | + pr_info("%lu\n", n); |
dece6358 AM |
31714 | +#endif |
31715 | +} | |
31716 | + | |
31717 | +static void au_nhash_wh_do_free(struct hlist_head *head) | |
1facf9fc | 31718 | +{ |
c06a8ce3 AM |
31719 | + struct au_vdir_wh *pos; |
31720 | + struct hlist_node *node; | |
1facf9fc | 31721 | + |
c06a8ce3 | 31722 | + hlist_for_each_entry_safe(pos, node, head, wh_hash) |
1c60b727 | 31723 | + kfree(pos); |
1facf9fc | 31724 | +} |
31725 | + | |
dece6358 | 31726 | +static void au_nhash_de_do_free(struct hlist_head *head) |
1facf9fc | 31727 | +{ |
c06a8ce3 AM |
31728 | + struct au_vdir_dehstr *pos; |
31729 | + struct hlist_node *node; | |
1facf9fc | 31730 | + |
c06a8ce3 | 31731 | + hlist_for_each_entry_safe(pos, node, head, hash) |
1c60b727 | 31732 | + au_cache_free_vdir_dehstr(pos); |
1facf9fc | 31733 | +} |
31734 | + | |
dece6358 AM |
31735 | +static void au_nhash_do_free(struct au_nhash *nhash, |
31736 | + void (*free)(struct hlist_head *head)) | |
1facf9fc | 31737 | +{ |
1308ab2a | 31738 | + unsigned int n; |
1facf9fc | 31739 | + struct hlist_head *head; |
1facf9fc | 31740 | + |
dece6358 | 31741 | + n = nhash->nh_num; |
1308ab2a | 31742 | + if (!n) |
31743 | + return; | |
31744 | + | |
dece6358 | 31745 | + head = nhash->nh_head; |
1308ab2a | 31746 | + while (n-- > 0) { |
dece6358 AM |
31747 | + nhash_count(head); |
31748 | + free(head++); | |
1facf9fc | 31749 | + } |
1c60b727 | 31750 | + kfree(nhash->nh_head); |
1facf9fc | 31751 | +} |
31752 | + | |
dece6358 | 31753 | +void au_nhash_wh_free(struct au_nhash *whlist) |
1facf9fc | 31754 | +{ |
dece6358 AM |
31755 | + au_nhash_do_free(whlist, au_nhash_wh_do_free); |
31756 | +} | |
1facf9fc | 31757 | + |
dece6358 AM |
31758 | +static void au_nhash_de_free(struct au_nhash *delist) |
31759 | +{ | |
31760 | + au_nhash_do_free(delist, au_nhash_de_do_free); | |
1facf9fc | 31761 | +} |
31762 | + | |
31763 | +/* ---------------------------------------------------------------------- */ | |
31764 | + | |
31765 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, | |
31766 | + int limit) | |
31767 | +{ | |
31768 | + int num; | |
31769 | + unsigned int u, n; | |
31770 | + struct hlist_head *head; | |
c06a8ce3 | 31771 | + struct au_vdir_wh *pos; |
1facf9fc | 31772 | + |
31773 | + num = 0; | |
31774 | + n = whlist->nh_num; | |
31775 | + head = whlist->nh_head; | |
1308ab2a | 31776 | + for (u = 0; u < n; u++, head++) |
c06a8ce3 AM |
31777 | + hlist_for_each_entry(pos, head, wh_hash) |
31778 | + if (pos->wh_bindex == btgt && ++num > limit) | |
1facf9fc | 31779 | + return 1; |
1facf9fc | 31780 | + return 0; |
31781 | +} | |
31782 | + | |
31783 | +static struct hlist_head *au_name_hash(struct au_nhash *nhash, | |
dece6358 | 31784 | + unsigned char *name, |
1facf9fc | 31785 | + unsigned int len) |
31786 | +{ | |
dece6358 AM |
31787 | + unsigned int v; |
31788 | + /* const unsigned int magic_bit = 12; */ | |
31789 | + | |
1308ab2a | 31790 | + AuDebugOn(!nhash->nh_num || !nhash->nh_head); |
31791 | + | |
dece6358 | 31792 | + v = 0; |
f0c0a007 AM |
31793 | + if (len > 8) |
31794 | + len = 8; | |
dece6358 AM |
31795 | + while (len--) |
31796 | + v += *name++; | |
31797 | + /* v = hash_long(v, magic_bit); */ | |
31798 | + v %= nhash->nh_num; | |
31799 | + return nhash->nh_head + v; | |
31800 | +} | |
31801 | + | |
31802 | +static int au_nhash_test_name(struct au_vdir_destr *str, const char *name, | |
31803 | + int nlen) | |
31804 | +{ | |
31805 | + return str->len == nlen && !memcmp(str->name, name, nlen); | |
1facf9fc | 31806 | +} |
31807 | + | |
31808 | +/* returns found or not */ | |
dece6358 | 31809 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen) |
1facf9fc | 31810 | +{ |
31811 | + struct hlist_head *head; | |
c06a8ce3 | 31812 | + struct au_vdir_wh *pos; |
1facf9fc | 31813 | + struct au_vdir_destr *str; |
31814 | + | |
dece6358 | 31815 | + head = au_name_hash(whlist, name, nlen); |
c06a8ce3 AM |
31816 | + hlist_for_each_entry(pos, head, wh_hash) { |
31817 | + str = &pos->wh_str; | |
1facf9fc | 31818 | + AuDbg("%.*s\n", str->len, str->name); |
dece6358 AM |
31819 | + if (au_nhash_test_name(str, name, nlen)) |
31820 | + return 1; | |
31821 | + } | |
31822 | + return 0; | |
31823 | +} | |
31824 | + | |
31825 | +/* returns found(true) or not */ | |
31826 | +static int test_known(struct au_nhash *delist, char *name, int nlen) | |
31827 | +{ | |
31828 | + struct hlist_head *head; | |
c06a8ce3 | 31829 | + struct au_vdir_dehstr *pos; |
dece6358 AM |
31830 | + struct au_vdir_destr *str; |
31831 | + | |
31832 | + head = au_name_hash(delist, name, nlen); | |
c06a8ce3 AM |
31833 | + hlist_for_each_entry(pos, head, hash) { |
31834 | + str = pos->str; | |
dece6358 AM |
31835 | + AuDbg("%.*s\n", str->len, str->name); |
31836 | + if (au_nhash_test_name(str, name, nlen)) | |
1facf9fc | 31837 | + return 1; |
31838 | + } | |
31839 | + return 0; | |
31840 | +} | |
31841 | + | |
dece6358 AM |
31842 | +static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino, |
31843 | + unsigned char d_type) | |
31844 | +{ | |
31845 | +#ifdef CONFIG_AUFS_SHWH | |
31846 | + wh->wh_ino = ino; | |
31847 | + wh->wh_type = d_type; | |
31848 | +#endif | |
31849 | +} | |
31850 | + | |
31851 | +/* ---------------------------------------------------------------------- */ | |
31852 | + | |
31853 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
31854 | + unsigned int d_type, aufs_bindex_t bindex, | |
31855 | + unsigned char shwh) | |
1facf9fc | 31856 | +{ |
31857 | + int err; | |
31858 | + struct au_vdir_destr *str; | |
31859 | + struct au_vdir_wh *wh; | |
31860 | + | |
dece6358 | 31861 | + AuDbg("%.*s\n", nlen, name); |
1308ab2a | 31862 | + AuDebugOn(!whlist->nh_num || !whlist->nh_head); |
31863 | + | |
1facf9fc | 31864 | + err = -ENOMEM; |
dece6358 | 31865 | + wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS); |
1facf9fc | 31866 | + if (unlikely(!wh)) |
31867 | + goto out; | |
31868 | + | |
31869 | + err = 0; | |
31870 | + wh->wh_bindex = bindex; | |
dece6358 AM |
31871 | + if (shwh) |
31872 | + au_shwh_init_wh(wh, ino, d_type); | |
1facf9fc | 31873 | + str = &wh->wh_str; |
dece6358 AM |
31874 | + str->len = nlen; |
31875 | + memcpy(str->name, name, nlen); | |
31876 | + hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen)); | |
1facf9fc | 31877 | + /* smp_mb(); */ |
31878 | + | |
4f0767ce | 31879 | +out: |
1facf9fc | 31880 | + return err; |
31881 | +} | |
31882 | + | |
1facf9fc | 31883 | +static int append_deblk(struct au_vdir *vdir) |
31884 | +{ | |
31885 | + int err; | |
dece6358 | 31886 | + unsigned long ul; |
1facf9fc | 31887 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; |
31888 | + union au_vdir_deblk_p p, deblk_end; | |
31889 | + unsigned char **o; | |
31890 | + | |
31891 | + err = -ENOMEM; | |
e2f27e51 AM |
31892 | + o = au_krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1), |
31893 | + GFP_NOFS, /*may_shrink*/0); | |
1facf9fc | 31894 | + if (unlikely(!o)) |
31895 | + goto out; | |
31896 | + | |
31897 | + vdir->vd_deblk = o; | |
31898 | + p.deblk = kmalloc(deblk_sz, GFP_NOFS); | |
31899 | + if (p.deblk) { | |
31900 | + ul = vdir->vd_nblk++; | |
31901 | + vdir->vd_deblk[ul] = p.deblk; | |
31902 | + vdir->vd_last.ul = ul; | |
31903 | + vdir->vd_last.p.deblk = p.deblk; | |
31904 | + deblk_end.deblk = p.deblk + deblk_sz; | |
31905 | + err = set_deblk_end(&p, &deblk_end); | |
31906 | + } | |
31907 | + | |
4f0767ce | 31908 | +out: |
1facf9fc | 31909 | + return err; |
31910 | +} | |
31911 | + | |
dece6358 AM |
31912 | +static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino, |
31913 | + unsigned int d_type, struct au_nhash *delist) | |
31914 | +{ | |
31915 | + int err; | |
31916 | + unsigned int sz; | |
31917 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; | |
31918 | + union au_vdir_deblk_p p, *room, deblk_end; | |
31919 | + struct au_vdir_dehstr *dehstr; | |
31920 | + | |
31921 | + p.deblk = last_deblk(vdir); | |
31922 | + deblk_end.deblk = p.deblk + deblk_sz; | |
31923 | + room = &vdir->vd_last.p; | |
31924 | + AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk | |
31925 | + || !is_deblk_end(room, &deblk_end)); | |
31926 | + | |
31927 | + sz = calc_size(nlen); | |
31928 | + if (unlikely(sz > deblk_end.deblk - room->deblk)) { | |
31929 | + err = append_deblk(vdir); | |
31930 | + if (unlikely(err)) | |
31931 | + goto out; | |
31932 | + | |
31933 | + p.deblk = last_deblk(vdir); | |
31934 | + deblk_end.deblk = p.deblk + deblk_sz; | |
31935 | + /* smp_mb(); */ | |
31936 | + AuDebugOn(room->deblk != p.deblk); | |
31937 | + } | |
31938 | + | |
31939 | + err = -ENOMEM; | |
4a4d8108 | 31940 | + dehstr = au_cache_alloc_vdir_dehstr(); |
dece6358 AM |
31941 | + if (unlikely(!dehstr)) |
31942 | + goto out; | |
31943 | + | |
31944 | + dehstr->str = &room->de->de_str; | |
31945 | + hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen)); | |
31946 | + room->de->de_ino = ino; | |
31947 | + room->de->de_type = d_type; | |
31948 | + room->de->de_str.len = nlen; | |
31949 | + memcpy(room->de->de_str.name, name, nlen); | |
31950 | + | |
31951 | + err = 0; | |
31952 | + room->deblk += sz; | |
31953 | + if (unlikely(set_deblk_end(room, &deblk_end))) | |
31954 | + err = append_deblk(vdir); | |
31955 | + /* smp_mb(); */ | |
31956 | + | |
4f0767ce | 31957 | +out: |
dece6358 AM |
31958 | + return err; |
31959 | +} | |
31960 | + | |
31961 | +/* ---------------------------------------------------------------------- */ | |
31962 | + | |
1c60b727 | 31963 | +void au_vdir_free(struct au_vdir *vdir) |
dece6358 AM |
31964 | +{ |
31965 | + unsigned char **deblk; | |
31966 | + | |
31967 | + deblk = vdir->vd_deblk; | |
1c60b727 AM |
31968 | + while (vdir->vd_nblk--) |
31969 | + kfree(*deblk++); | |
31970 | + kfree(vdir->vd_deblk); | |
31971 | + au_cache_free_vdir(vdir); | |
dece6358 AM |
31972 | +} |
31973 | + | |
1308ab2a | 31974 | +static struct au_vdir *alloc_vdir(struct file *file) |
1facf9fc | 31975 | +{ |
31976 | + struct au_vdir *vdir; | |
1308ab2a | 31977 | + struct super_block *sb; |
1facf9fc | 31978 | + int err; |
31979 | + | |
2000de60 | 31980 | + sb = file->f_path.dentry->d_sb; |
dece6358 AM |
31981 | + SiMustAnyLock(sb); |
31982 | + | |
1facf9fc | 31983 | + err = -ENOMEM; |
31984 | + vdir = au_cache_alloc_vdir(); | |
31985 | + if (unlikely(!vdir)) | |
31986 | + goto out; | |
31987 | + | |
31988 | + vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS); | |
31989 | + if (unlikely(!vdir->vd_deblk)) | |
31990 | + goto out_free; | |
31991 | + | |
31992 | + vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk; | |
1308ab2a | 31993 | + if (!vdir->vd_deblk_sz) { |
79b8bda9 | 31994 | + /* estimate the appropriate size for deblk */ |
1308ab2a | 31995 | + vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL); |
4a4d8108 | 31996 | + /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */ |
1308ab2a | 31997 | + } |
1facf9fc | 31998 | + vdir->vd_nblk = 0; |
31999 | + vdir->vd_version = 0; | |
32000 | + vdir->vd_jiffy = 0; | |
32001 | + err = append_deblk(vdir); | |
32002 | + if (!err) | |
32003 | + return vdir; /* success */ | |
32004 | + | |
1c60b727 | 32005 | + kfree(vdir->vd_deblk); |
1facf9fc | 32006 | + |
4f0767ce | 32007 | +out_free: |
1c60b727 | 32008 | + au_cache_free_vdir(vdir); |
4f0767ce | 32009 | +out: |
1facf9fc | 32010 | + vdir = ERR_PTR(err); |
32011 | + return vdir; | |
32012 | +} | |
32013 | + | |
32014 | +static int reinit_vdir(struct au_vdir *vdir) | |
32015 | +{ | |
32016 | + int err; | |
32017 | + union au_vdir_deblk_p p, deblk_end; | |
32018 | + | |
32019 | + while (vdir->vd_nblk > 1) { | |
1c60b727 | 32020 | + kfree(vdir->vd_deblk[vdir->vd_nblk - 1]); |
1facf9fc | 32021 | + /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */ |
32022 | + vdir->vd_nblk--; | |
32023 | + } | |
32024 | + p.deblk = vdir->vd_deblk[0]; | |
32025 | + deblk_end.deblk = p.deblk + vdir->vd_deblk_sz; | |
32026 | + err = set_deblk_end(&p, &deblk_end); | |
32027 | + /* keep vd_dblk_sz */ | |
32028 | + vdir->vd_last.ul = 0; | |
32029 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
32030 | + vdir->vd_version = 0; | |
32031 | + vdir->vd_jiffy = 0; | |
32032 | + /* smp_mb(); */ | |
32033 | + return err; | |
32034 | +} | |
32035 | + | |
32036 | +/* ---------------------------------------------------------------------- */ | |
32037 | + | |
1facf9fc | 32038 | +#define AuFillVdir_CALLED 1 |
32039 | +#define AuFillVdir_WHABLE (1 << 1) | |
dece6358 | 32040 | +#define AuFillVdir_SHWH (1 << 2) |
1facf9fc | 32041 | +#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name) |
7f207e10 AM |
32042 | +#define au_fset_fillvdir(flags, name) \ |
32043 | + do { (flags) |= AuFillVdir_##name; } while (0) | |
32044 | +#define au_fclr_fillvdir(flags, name) \ | |
32045 | + do { (flags) &= ~AuFillVdir_##name; } while (0) | |
1facf9fc | 32046 | + |
dece6358 AM |
32047 | +#ifndef CONFIG_AUFS_SHWH |
32048 | +#undef AuFillVdir_SHWH | |
32049 | +#define AuFillVdir_SHWH 0 | |
32050 | +#endif | |
32051 | + | |
1facf9fc | 32052 | +struct fillvdir_arg { |
392086de | 32053 | + struct dir_context ctx; |
1facf9fc | 32054 | + struct file *file; |
32055 | + struct au_vdir *vdir; | |
dece6358 AM |
32056 | + struct au_nhash delist; |
32057 | + struct au_nhash whlist; | |
1facf9fc | 32058 | + aufs_bindex_t bindex; |
32059 | + unsigned int flags; | |
32060 | + int err; | |
32061 | +}; | |
32062 | + | |
392086de | 32063 | +static int fillvdir(struct dir_context *ctx, const char *__name, int nlen, |
1facf9fc | 32064 | + loff_t offset __maybe_unused, u64 h_ino, |
32065 | + unsigned int d_type) | |
32066 | +{ | |
392086de | 32067 | + struct fillvdir_arg *arg = container_of(ctx, struct fillvdir_arg, ctx); |
1facf9fc | 32068 | + char *name = (void *)__name; |
32069 | + struct super_block *sb; | |
1facf9fc | 32070 | + ino_t ino; |
dece6358 | 32071 | + const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH); |
1facf9fc | 32072 | + |
1facf9fc | 32073 | + arg->err = 0; |
2000de60 | 32074 | + sb = arg->file->f_path.dentry->d_sb; |
1facf9fc | 32075 | + au_fset_fillvdir(arg->flags, CALLED); |
32076 | + /* smp_mb(); */ | |
dece6358 | 32077 | + if (nlen <= AUFS_WH_PFX_LEN |
1facf9fc | 32078 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { |
dece6358 AM |
32079 | + if (test_known(&arg->delist, name, nlen) |
32080 | + || au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
32081 | + goto out; /* already exists or whiteouted */ | |
1facf9fc | 32082 | + |
dece6358 | 32083 | + arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino); |
4a4d8108 AM |
32084 | + if (!arg->err) { |
32085 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) | |
32086 | + d_type = DT_UNKNOWN; | |
dece6358 AM |
32087 | + arg->err = append_de(arg->vdir, name, nlen, ino, |
32088 | + d_type, &arg->delist); | |
4a4d8108 | 32089 | + } |
1facf9fc | 32090 | + } else if (au_ftest_fillvdir(arg->flags, WHABLE)) { |
32091 | + name += AUFS_WH_PFX_LEN; | |
dece6358 AM |
32092 | + nlen -= AUFS_WH_PFX_LEN; |
32093 | + if (au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
32094 | + goto out; /* already whiteouted */ | |
1facf9fc | 32095 | + |
dece6358 AM |
32096 | + if (shwh) |
32097 | + arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type, | |
32098 | + &ino); | |
4a4d8108 AM |
32099 | + if (!arg->err) { |
32100 | + if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN) | |
32101 | + d_type = DT_UNKNOWN; | |
1facf9fc | 32102 | + arg->err = au_nhash_append_wh |
dece6358 AM |
32103 | + (&arg->whlist, name, nlen, ino, d_type, |
32104 | + arg->bindex, shwh); | |
4a4d8108 | 32105 | + } |
1facf9fc | 32106 | + } |
32107 | + | |
4f0767ce | 32108 | +out: |
1facf9fc | 32109 | + if (!arg->err) |
32110 | + arg->vdir->vd_jiffy = jiffies; | |
32111 | + /* smp_mb(); */ | |
32112 | + AuTraceErr(arg->err); | |
32113 | + return arg->err; | |
32114 | +} | |
32115 | + | |
dece6358 AM |
32116 | +static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir, |
32117 | + struct au_nhash *whlist, struct au_nhash *delist) | |
32118 | +{ | |
32119 | +#ifdef CONFIG_AUFS_SHWH | |
32120 | + int err; | |
32121 | + unsigned int nh, u; | |
32122 | + struct hlist_head *head; | |
c06a8ce3 AM |
32123 | + struct au_vdir_wh *pos; |
32124 | + struct hlist_node *n; | |
dece6358 AM |
32125 | + char *p, *o; |
32126 | + struct au_vdir_destr *destr; | |
32127 | + | |
32128 | + AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH)); | |
32129 | + | |
32130 | + err = -ENOMEM; | |
537831f9 | 32131 | + o = p = (void *)__get_free_page(GFP_NOFS); |
dece6358 AM |
32132 | + if (unlikely(!p)) |
32133 | + goto out; | |
32134 | + | |
32135 | + err = 0; | |
32136 | + nh = whlist->nh_num; | |
32137 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
32138 | + p += AUFS_WH_PFX_LEN; | |
32139 | + for (u = 0; u < nh; u++) { | |
32140 | + head = whlist->nh_head + u; | |
c06a8ce3 AM |
32141 | + hlist_for_each_entry_safe(pos, n, head, wh_hash) { |
32142 | + destr = &pos->wh_str; | |
dece6358 AM |
32143 | + memcpy(p, destr->name, destr->len); |
32144 | + err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN, | |
c06a8ce3 | 32145 | + pos->wh_ino, pos->wh_type, delist); |
dece6358 AM |
32146 | + if (unlikely(err)) |
32147 | + break; | |
32148 | + } | |
32149 | + } | |
32150 | + | |
1c60b727 | 32151 | + free_page((unsigned long)o); |
dece6358 | 32152 | + |
4f0767ce | 32153 | +out: |
dece6358 AM |
32154 | + AuTraceErr(err); |
32155 | + return err; | |
32156 | +#else | |
32157 | + return 0; | |
32158 | +#endif | |
32159 | +} | |
32160 | + | |
1facf9fc | 32161 | +static int au_do_read_vdir(struct fillvdir_arg *arg) |
32162 | +{ | |
32163 | + int err; | |
dece6358 | 32164 | + unsigned int rdhash; |
1facf9fc | 32165 | + loff_t offset; |
5afbbe0d | 32166 | + aufs_bindex_t bbot, bindex, btop; |
dece6358 | 32167 | + unsigned char shwh; |
1facf9fc | 32168 | + struct file *hf, *file; |
32169 | + struct super_block *sb; | |
32170 | + | |
1facf9fc | 32171 | + file = arg->file; |
2000de60 | 32172 | + sb = file->f_path.dentry->d_sb; |
dece6358 AM |
32173 | + SiMustAnyLock(sb); |
32174 | + | |
32175 | + rdhash = au_sbi(sb)->si_rdhash; | |
1308ab2a | 32176 | + if (!rdhash) |
32177 | + rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL)); | |
dece6358 AM |
32178 | + err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS); |
32179 | + if (unlikely(err)) | |
1facf9fc | 32180 | + goto out; |
dece6358 AM |
32181 | + err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS); |
32182 | + if (unlikely(err)) | |
1facf9fc | 32183 | + goto out_delist; |
32184 | + | |
32185 | + err = 0; | |
32186 | + arg->flags = 0; | |
dece6358 AM |
32187 | + shwh = 0; |
32188 | + if (au_opt_test(au_mntflags(sb), SHWH)) { | |
32189 | + shwh = 1; | |
32190 | + au_fset_fillvdir(arg->flags, SHWH); | |
32191 | + } | |
5afbbe0d AM |
32192 | + btop = au_fbtop(file); |
32193 | + bbot = au_fbbot_dir(file); | |
32194 | + for (bindex = btop; !err && bindex <= bbot; bindex++) { | |
4a4d8108 | 32195 | + hf = au_hf_dir(file, bindex); |
1facf9fc | 32196 | + if (!hf) |
32197 | + continue; | |
32198 | + | |
32199 | + offset = vfsub_llseek(hf, 0, SEEK_SET); | |
32200 | + err = offset; | |
32201 | + if (unlikely(offset)) | |
32202 | + break; | |
32203 | + | |
32204 | + arg->bindex = bindex; | |
32205 | + au_fclr_fillvdir(arg->flags, WHABLE); | |
dece6358 | 32206 | + if (shwh |
5afbbe0d | 32207 | + || (bindex != bbot |
dece6358 | 32208 | + && au_br_whable(au_sbr_perm(sb, bindex)))) |
1facf9fc | 32209 | + au_fset_fillvdir(arg->flags, WHABLE); |
32210 | + do { | |
32211 | + arg->err = 0; | |
32212 | + au_fclr_fillvdir(arg->flags, CALLED); | |
32213 | + /* smp_mb(); */ | |
392086de | 32214 | + err = vfsub_iterate_dir(hf, &arg->ctx); |
1facf9fc | 32215 | + if (err >= 0) |
32216 | + err = arg->err; | |
32217 | + } while (!err && au_ftest_fillvdir(arg->flags, CALLED)); | |
392086de AM |
32218 | + |
32219 | + /* | |
32220 | + * dir_relax() may be good for concurrency, but aufs should not | |
32221 | + * use it since it will cause a lockdep problem. | |
32222 | + */ | |
1facf9fc | 32223 | + } |
dece6358 AM |
32224 | + |
32225 | + if (!err && shwh) | |
32226 | + err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist); | |
32227 | + | |
32228 | + au_nhash_wh_free(&arg->whlist); | |
1facf9fc | 32229 | + |
4f0767ce | 32230 | +out_delist: |
dece6358 | 32231 | + au_nhash_de_free(&arg->delist); |
4f0767ce | 32232 | +out: |
1facf9fc | 32233 | + return err; |
32234 | +} | |
32235 | + | |
32236 | +static int read_vdir(struct file *file, int may_read) | |
32237 | +{ | |
32238 | + int err; | |
32239 | + unsigned long expire; | |
32240 | + unsigned char do_read; | |
392086de AM |
32241 | + struct fillvdir_arg arg = { |
32242 | + .ctx = { | |
2000de60 | 32243 | + .actor = fillvdir |
392086de AM |
32244 | + } |
32245 | + }; | |
1facf9fc | 32246 | + struct inode *inode; |
32247 | + struct au_vdir *vdir, *allocated; | |
32248 | + | |
32249 | + err = 0; | |
c06a8ce3 | 32250 | + inode = file_inode(file); |
1facf9fc | 32251 | + IMustLock(inode); |
5afbbe0d | 32252 | + IiMustWriteLock(inode); |
dece6358 AM |
32253 | + SiMustAnyLock(inode->i_sb); |
32254 | + | |
1facf9fc | 32255 | + allocated = NULL; |
32256 | + do_read = 0; | |
32257 | + expire = au_sbi(inode->i_sb)->si_rdcache; | |
32258 | + vdir = au_ivdir(inode); | |
32259 | + if (!vdir) { | |
32260 | + do_read = 1; | |
1308ab2a | 32261 | + vdir = alloc_vdir(file); |
1facf9fc | 32262 | + err = PTR_ERR(vdir); |
32263 | + if (IS_ERR(vdir)) | |
32264 | + goto out; | |
32265 | + err = 0; | |
32266 | + allocated = vdir; | |
32267 | + } else if (may_read | |
be118d29 | 32268 | + && (!inode_eq_iversion(inode, vdir->vd_version) |
1facf9fc | 32269 | + || time_after(jiffies, vdir->vd_jiffy + expire))) { |
32270 | + do_read = 1; | |
32271 | + err = reinit_vdir(vdir); | |
32272 | + if (unlikely(err)) | |
32273 | + goto out; | |
32274 | + } | |
32275 | + | |
32276 | + if (!do_read) | |
32277 | + return 0; /* success */ | |
32278 | + | |
32279 | + arg.file = file; | |
32280 | + arg.vdir = vdir; | |
32281 | + err = au_do_read_vdir(&arg); | |
32282 | + if (!err) { | |
392086de | 32283 | + /* file->f_pos = 0; */ /* todo: ctx->pos? */ |
be118d29 | 32284 | + vdir->vd_version = inode_query_iversion(inode); |
1facf9fc | 32285 | + vdir->vd_last.ul = 0; |
32286 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
32287 | + if (allocated) | |
32288 | + au_set_ivdir(inode, allocated); | |
32289 | + } else if (allocated) | |
1c60b727 | 32290 | + au_vdir_free(allocated); |
1facf9fc | 32291 | + |
4f0767ce | 32292 | +out: |
1facf9fc | 32293 | + return err; |
32294 | +} | |
32295 | + | |
32296 | +static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src) | |
32297 | +{ | |
32298 | + int err, rerr; | |
32299 | + unsigned long ul, n; | |
32300 | + const unsigned int deblk_sz = src->vd_deblk_sz; | |
32301 | + | |
32302 | + AuDebugOn(tgt->vd_nblk != 1); | |
32303 | + | |
32304 | + err = -ENOMEM; | |
32305 | + if (tgt->vd_nblk < src->vd_nblk) { | |
32306 | + unsigned char **p; | |
32307 | + | |
e2f27e51 AM |
32308 | + p = au_krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk, |
32309 | + GFP_NOFS, /*may_shrink*/0); | |
1facf9fc | 32310 | + if (unlikely(!p)) |
32311 | + goto out; | |
32312 | + tgt->vd_deblk = p; | |
32313 | + } | |
32314 | + | |
1308ab2a | 32315 | + if (tgt->vd_deblk_sz != deblk_sz) { |
32316 | + unsigned char *p; | |
32317 | + | |
32318 | + tgt->vd_deblk_sz = deblk_sz; | |
e2f27e51 AM |
32319 | + p = au_krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS, |
32320 | + /*may_shrink*/1); | |
1308ab2a | 32321 | + if (unlikely(!p)) |
32322 | + goto out; | |
32323 | + tgt->vd_deblk[0] = p; | |
32324 | + } | |
1facf9fc | 32325 | + memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz); |
1facf9fc | 32326 | + tgt->vd_version = src->vd_version; |
32327 | + tgt->vd_jiffy = src->vd_jiffy; | |
32328 | + | |
32329 | + n = src->vd_nblk; | |
32330 | + for (ul = 1; ul < n; ul++) { | |
dece6358 AM |
32331 | + tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz, |
32332 | + GFP_NOFS); | |
32333 | + if (unlikely(!tgt->vd_deblk[ul])) | |
1facf9fc | 32334 | + goto out; |
1308ab2a | 32335 | + tgt->vd_nblk++; |
1facf9fc | 32336 | + } |
1308ab2a | 32337 | + tgt->vd_nblk = n; |
32338 | + tgt->vd_last.ul = tgt->vd_last.ul; | |
32339 | + tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul]; | |
32340 | + tgt->vd_last.p.deblk += src->vd_last.p.deblk | |
32341 | + - src->vd_deblk[src->vd_last.ul]; | |
1facf9fc | 32342 | + /* smp_mb(); */ |
32343 | + return 0; /* success */ | |
32344 | + | |
4f0767ce | 32345 | +out: |
1facf9fc | 32346 | + rerr = reinit_vdir(tgt); |
32347 | + BUG_ON(rerr); | |
32348 | + return err; | |
32349 | +} | |
32350 | + | |
32351 | +int au_vdir_init(struct file *file) | |
32352 | +{ | |
32353 | + int err; | |
32354 | + struct inode *inode; | |
32355 | + struct au_vdir *vdir_cache, *allocated; | |
32356 | + | |
392086de | 32357 | + /* test file->f_pos here instead of ctx->pos */ |
1facf9fc | 32358 | + err = read_vdir(file, !file->f_pos); |
32359 | + if (unlikely(err)) | |
32360 | + goto out; | |
32361 | + | |
32362 | + allocated = NULL; | |
32363 | + vdir_cache = au_fvdir_cache(file); | |
32364 | + if (!vdir_cache) { | |
1308ab2a | 32365 | + vdir_cache = alloc_vdir(file); |
1facf9fc | 32366 | + err = PTR_ERR(vdir_cache); |
32367 | + if (IS_ERR(vdir_cache)) | |
32368 | + goto out; | |
32369 | + allocated = vdir_cache; | |
32370 | + } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) { | |
392086de | 32371 | + /* test file->f_pos here instead of ctx->pos */ |
1facf9fc | 32372 | + err = reinit_vdir(vdir_cache); |
32373 | + if (unlikely(err)) | |
32374 | + goto out; | |
32375 | + } else | |
32376 | + return 0; /* success */ | |
32377 | + | |
c06a8ce3 | 32378 | + inode = file_inode(file); |
1facf9fc | 32379 | + err = copy_vdir(vdir_cache, au_ivdir(inode)); |
32380 | + if (!err) { | |
be118d29 | 32381 | + file->f_version = inode_query_iversion(inode); |
1facf9fc | 32382 | + if (allocated) |
32383 | + au_set_fvdir_cache(file, allocated); | |
32384 | + } else if (allocated) | |
1c60b727 | 32385 | + au_vdir_free(allocated); |
1facf9fc | 32386 | + |
4f0767ce | 32387 | +out: |
1facf9fc | 32388 | + return err; |
32389 | +} | |
32390 | + | |
32391 | +static loff_t calc_offset(struct au_vdir *vdir) | |
32392 | +{ | |
32393 | + loff_t offset; | |
32394 | + union au_vdir_deblk_p p; | |
32395 | + | |
32396 | + p.deblk = vdir->vd_deblk[vdir->vd_last.ul]; | |
32397 | + offset = vdir->vd_last.p.deblk - p.deblk; | |
32398 | + offset += vdir->vd_deblk_sz * vdir->vd_last.ul; | |
32399 | + return offset; | |
32400 | +} | |
32401 | + | |
32402 | +/* returns true or false */ | |
392086de | 32403 | +static int seek_vdir(struct file *file, struct dir_context *ctx) |
1facf9fc | 32404 | +{ |
32405 | + int valid; | |
32406 | + unsigned int deblk_sz; | |
32407 | + unsigned long ul, n; | |
32408 | + loff_t offset; | |
32409 | + union au_vdir_deblk_p p, deblk_end; | |
32410 | + struct au_vdir *vdir_cache; | |
32411 | + | |
32412 | + valid = 1; | |
32413 | + vdir_cache = au_fvdir_cache(file); | |
32414 | + offset = calc_offset(vdir_cache); | |
32415 | + AuDbg("offset %lld\n", offset); | |
392086de | 32416 | + if (ctx->pos == offset) |
1facf9fc | 32417 | + goto out; |
32418 | + | |
32419 | + vdir_cache->vd_last.ul = 0; | |
32420 | + vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0]; | |
392086de | 32421 | + if (!ctx->pos) |
1facf9fc | 32422 | + goto out; |
32423 | + | |
32424 | + valid = 0; | |
32425 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
392086de | 32426 | + ul = div64_u64(ctx->pos, deblk_sz); |
1facf9fc | 32427 | + AuDbg("ul %lu\n", ul); |
32428 | + if (ul >= vdir_cache->vd_nblk) | |
32429 | + goto out; | |
32430 | + | |
32431 | + n = vdir_cache->vd_nblk; | |
32432 | + for (; ul < n; ul++) { | |
32433 | + p.deblk = vdir_cache->vd_deblk[ul]; | |
32434 | + deblk_end.deblk = p.deblk + deblk_sz; | |
32435 | + offset = ul; | |
32436 | + offset *= deblk_sz; | |
392086de | 32437 | + while (!is_deblk_end(&p, &deblk_end) && offset < ctx->pos) { |
1facf9fc | 32438 | + unsigned int l; |
32439 | + | |
32440 | + l = calc_size(p.de->de_str.len); | |
32441 | + offset += l; | |
32442 | + p.deblk += l; | |
32443 | + } | |
32444 | + if (!is_deblk_end(&p, &deblk_end)) { | |
32445 | + valid = 1; | |
32446 | + vdir_cache->vd_last.ul = ul; | |
32447 | + vdir_cache->vd_last.p = p; | |
32448 | + break; | |
32449 | + } | |
32450 | + } | |
32451 | + | |
4f0767ce | 32452 | +out: |
1facf9fc | 32453 | + /* smp_mb(); */ |
b00004a5 AM |
32454 | + if (!valid) |
32455 | + AuDbg("valid %d\n", !valid); | |
1facf9fc | 32456 | + return valid; |
32457 | +} | |
32458 | + | |
392086de | 32459 | +int au_vdir_fill_de(struct file *file, struct dir_context *ctx) |
1facf9fc | 32460 | +{ |
1facf9fc | 32461 | + unsigned int l, deblk_sz; |
32462 | + union au_vdir_deblk_p deblk_end; | |
32463 | + struct au_vdir *vdir_cache; | |
32464 | + struct au_vdir_de *de; | |
32465 | + | |
32466 | + vdir_cache = au_fvdir_cache(file); | |
392086de | 32467 | + if (!seek_vdir(file, ctx)) |
1facf9fc | 32468 | + return 0; |
32469 | + | |
32470 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
32471 | + while (1) { | |
32472 | + deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
32473 | + deblk_end.deblk += deblk_sz; | |
32474 | + while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) { | |
32475 | + de = vdir_cache->vd_last.p.de; | |
32476 | + AuDbg("%.*s, off%lld, i%lu, dt%d\n", | |
392086de | 32477 | + de->de_str.len, de->de_str.name, ctx->pos, |
1facf9fc | 32478 | + (unsigned long)de->de_ino, de->de_type); |
392086de AM |
32479 | + if (unlikely(!dir_emit(ctx, de->de_str.name, |
32480 | + de->de_str.len, de->de_ino, | |
32481 | + de->de_type))) { | |
1facf9fc | 32482 | + /* todo: ignore the error caused by udba? */ |
32483 | + /* return err; */ | |
32484 | + return 0; | |
32485 | + } | |
32486 | + | |
32487 | + l = calc_size(de->de_str.len); | |
32488 | + vdir_cache->vd_last.p.deblk += l; | |
392086de | 32489 | + ctx->pos += l; |
1facf9fc | 32490 | + } |
32491 | + if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) { | |
32492 | + vdir_cache->vd_last.ul++; | |
32493 | + vdir_cache->vd_last.p.deblk | |
32494 | + = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
392086de | 32495 | + ctx->pos = deblk_sz * vdir_cache->vd_last.ul; |
1facf9fc | 32496 | + continue; |
32497 | + } | |
32498 | + break; | |
32499 | + } | |
32500 | + | |
32501 | + /* smp_mb(); */ | |
32502 | + return 0; | |
32503 | +} | |
7f207e10 AM |
32504 | diff -urN /usr/share/empty/fs/aufs/vfsub.c linux/fs/aufs/vfsub.c |
32505 | --- /usr/share/empty/fs/aufs/vfsub.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 32506 | +++ linux/fs/aufs/vfsub.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 32507 | @@ -0,0 +1,895 @@ |
cd7a4cd9 | 32508 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 32509 | +/* |
b00004a5 | 32510 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 32511 | + * |
32512 | + * This program, aufs is free software; you can redistribute it and/or modify | |
32513 | + * it under the terms of the GNU General Public License as published by | |
32514 | + * the Free Software Foundation; either version 2 of the License, or | |
32515 | + * (at your option) any later version. | |
dece6358 AM |
32516 | + * |
32517 | + * This program is distributed in the hope that it will be useful, | |
32518 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
32519 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
32520 | + * GNU General Public License for more details. | |
32521 | + * | |
32522 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 32523 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 32524 | + */ |
32525 | + | |
32526 | +/* | |
32527 | + * sub-routines for VFS | |
32528 | + */ | |
32529 | + | |
8b6a4947 | 32530 | +#include <linux/mnt_namespace.h> |
dece6358 | 32531 | +#include <linux/namei.h> |
8cdd5066 | 32532 | +#include <linux/nsproxy.h> |
dece6358 AM |
32533 | +#include <linux/security.h> |
32534 | +#include <linux/splice.h> | |
1facf9fc | 32535 | +#include "aufs.h" |
32536 | + | |
8cdd5066 JR |
32537 | +#ifdef CONFIG_AUFS_BR_FUSE |
32538 | +int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb) | |
32539 | +{ | |
8cdd5066 JR |
32540 | + if (!au_test_fuse(h_sb) || !au_userns) |
32541 | + return 0; | |
32542 | + | |
8b6a4947 | 32543 | + return is_current_mnt_ns(mnt) ? 0 : -EACCES; |
8cdd5066 JR |
32544 | +} |
32545 | +#endif | |
32546 | + | |
a2654f78 AM |
32547 | +int vfsub_sync_filesystem(struct super_block *h_sb, int wait) |
32548 | +{ | |
32549 | + int err; | |
32550 | + | |
32551 | + lockdep_off(); | |
32552 | + down_read(&h_sb->s_umount); | |
32553 | + err = __sync_filesystem(h_sb, wait); | |
32554 | + up_read(&h_sb->s_umount); | |
32555 | + lockdep_on(); | |
32556 | + | |
32557 | + return err; | |
32558 | +} | |
32559 | + | |
8cdd5066 JR |
32560 | +/* ---------------------------------------------------------------------- */ |
32561 | + | |
1facf9fc | 32562 | +int vfsub_update_h_iattr(struct path *h_path, int *did) |
32563 | +{ | |
32564 | + int err; | |
32565 | + struct kstat st; | |
32566 | + struct super_block *h_sb; | |
32567 | + | |
32568 | + /* for remote fs, leave work for its getattr or d_revalidate */ | |
32569 | + /* for bad i_attr fs, handle them in aufs_getattr() */ | |
32570 | + /* still some fs may acquire i_mutex. we need to skip them */ | |
32571 | + err = 0; | |
32572 | + if (!did) | |
32573 | + did = &err; | |
32574 | + h_sb = h_path->dentry->d_sb; | |
32575 | + *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb)); | |
32576 | + if (*did) | |
521ced18 | 32577 | + err = vfsub_getattr(h_path, &st); |
1facf9fc | 32578 | + |
32579 | + return err; | |
32580 | +} | |
32581 | + | |
32582 | +/* ---------------------------------------------------------------------- */ | |
32583 | + | |
4a4d8108 | 32584 | +struct file *vfsub_dentry_open(struct path *path, int flags) |
1308ab2a | 32585 | +{ |
32586 | + struct file *file; | |
32587 | + | |
b4510431 | 32588 | + file = dentry_open(path, flags /* | __FMODE_NONOTIFY */, |
7f207e10 | 32589 | + current_cred()); |
2cbb1c4b JR |
32590 | + if (!IS_ERR_OR_NULL(file) |
32591 | + && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) | |
5527c038 | 32592 | + i_readcount_inc(d_inode(path->dentry)); |
4a4d8108 | 32593 | + |
1308ab2a | 32594 | + return file; |
32595 | +} | |
32596 | + | |
1facf9fc | 32597 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode) |
32598 | +{ | |
32599 | + struct file *file; | |
32600 | + | |
2cbb1c4b | 32601 | + lockdep_off(); |
7f207e10 | 32602 | + file = filp_open(path, |
2cbb1c4b | 32603 | + oflags /* | __FMODE_NONOTIFY */, |
7f207e10 | 32604 | + mode); |
2cbb1c4b | 32605 | + lockdep_on(); |
1facf9fc | 32606 | + if (IS_ERR(file)) |
32607 | + goto out; | |
32608 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
32609 | + | |
4f0767ce | 32610 | +out: |
1facf9fc | 32611 | + return file; |
32612 | +} | |
32613 | + | |
b912730e AM |
32614 | +/* |
32615 | + * Ideally this function should call VFS:do_last() in order to keep all its | |
32616 | + * checkings. But it is very hard for aufs to regenerate several VFS internal | |
32617 | + * structure such as nameidata. This is a second (or third) best approach. | |
32618 | + * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open(). | |
32619 | + */ | |
32620 | +int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, | |
32621 | + struct vfsub_aopen_args *args, struct au_branch *br) | |
32622 | +{ | |
32623 | + int err; | |
32624 | + struct file *file = args->file; | |
32625 | + /* copied from linux/fs/namei.c:atomic_open() */ | |
32626 | + struct dentry *const DENTRY_NOT_SET = (void *)-1UL; | |
32627 | + | |
32628 | + IMustLock(dir); | |
32629 | + AuDebugOn(!dir->i_op->atomic_open); | |
32630 | + | |
32631 | + err = au_br_test_oflag(args->open_flag, br); | |
32632 | + if (unlikely(err)) | |
32633 | + goto out; | |
32634 | + | |
32635 | + args->file->f_path.dentry = DENTRY_NOT_SET; | |
32636 | + args->file->f_path.mnt = au_br_mnt(br); | |
32637 | + err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag, | |
32638 | + args->create_mode, args->opened); | |
32639 | + if (err >= 0) { | |
32640 | + /* some filesystems don't set FILE_CREATED while succeeded? */ | |
32641 | + if (*args->opened & FILE_CREATED) | |
32642 | + fsnotify_create(dir, dentry); | |
32643 | + } else | |
32644 | + goto out; | |
32645 | + | |
32646 | + | |
32647 | + if (!err) { | |
32648 | + /* todo: call VFS:may_open() here */ | |
c4adf169 | 32649 | + err = open_check_o_direct(file); |
b912730e AM |
32650 | + /* todo: ima_file_check() too? */ |
32651 | + if (!err && (args->open_flag & __FMODE_EXEC)) | |
32652 | + err = deny_write_access(file); | |
32653 | + if (unlikely(err)) | |
32654 | + /* note that the file is created and still opened */ | |
32655 | + goto out; | |
32656 | + } | |
32657 | + | |
5afbbe0d | 32658 | + au_br_get(br); |
b912730e AM |
32659 | + fsnotify_open(file); |
32660 | + | |
32661 | +out: | |
32662 | + return err; | |
32663 | +} | |
32664 | + | |
1facf9fc | 32665 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path) |
32666 | +{ | |
32667 | + int err; | |
32668 | + | |
1facf9fc | 32669 | + err = kern_path(name, flags, path); |
5527c038 | 32670 | + if (!err && d_is_positive(path->dentry)) |
1facf9fc | 32671 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ |
32672 | + return err; | |
32673 | +} | |
32674 | + | |
febd17d6 JR |
32675 | +struct dentry *vfsub_lookup_one_len_unlocked(const char *name, |
32676 | + struct dentry *parent, int len) | |
32677 | +{ | |
32678 | + struct path path = { | |
32679 | + .mnt = NULL | |
32680 | + }; | |
32681 | + | |
32682 | + path.dentry = lookup_one_len_unlocked(name, parent, len); | |
32683 | + if (IS_ERR(path.dentry)) | |
32684 | + goto out; | |
32685 | + if (d_is_positive(path.dentry)) | |
32686 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ | |
32687 | + | |
32688 | +out: | |
32689 | + AuTraceErrPtr(path.dentry); | |
32690 | + return path.dentry; | |
32691 | +} | |
32692 | + | |
1facf9fc | 32693 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, |
32694 | + int len) | |
32695 | +{ | |
32696 | + struct path path = { | |
32697 | + .mnt = NULL | |
32698 | + }; | |
32699 | + | |
1308ab2a | 32700 | + /* VFS checks it too, but by WARN_ON_ONCE() */ |
5527c038 | 32701 | + IMustLock(d_inode(parent)); |
1facf9fc | 32702 | + |
32703 | + path.dentry = lookup_one_len(name, parent, len); | |
32704 | + if (IS_ERR(path.dentry)) | |
32705 | + goto out; | |
5527c038 | 32706 | + if (d_is_positive(path.dentry)) |
1facf9fc | 32707 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ |
32708 | + | |
4f0767ce | 32709 | +out: |
4a4d8108 | 32710 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 32711 | + return path.dentry; |
32712 | +} | |
32713 | + | |
b4510431 | 32714 | +void vfsub_call_lkup_one(void *args) |
2cbb1c4b | 32715 | +{ |
b4510431 AM |
32716 | + struct vfsub_lkup_one_args *a = args; |
32717 | + *a->errp = vfsub_lkup_one(a->name, a->parent); | |
2cbb1c4b JR |
32718 | +} |
32719 | + | |
1facf9fc | 32720 | +/* ---------------------------------------------------------------------- */ |
32721 | + | |
32722 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
32723 | + struct dentry *d2, struct au_hinode *hdir2) | |
32724 | +{ | |
32725 | + struct dentry *d; | |
32726 | + | |
2cbb1c4b | 32727 | + lockdep_off(); |
1facf9fc | 32728 | + d = lock_rename(d1, d2); |
2cbb1c4b | 32729 | + lockdep_on(); |
4a4d8108 | 32730 | + au_hn_suspend(hdir1); |
1facf9fc | 32731 | + if (hdir1 != hdir2) |
4a4d8108 | 32732 | + au_hn_suspend(hdir2); |
1facf9fc | 32733 | + |
32734 | + return d; | |
32735 | +} | |
32736 | + | |
32737 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
32738 | + struct dentry *d2, struct au_hinode *hdir2) | |
32739 | +{ | |
4a4d8108 | 32740 | + au_hn_resume(hdir1); |
1facf9fc | 32741 | + if (hdir1 != hdir2) |
4a4d8108 | 32742 | + au_hn_resume(hdir2); |
2cbb1c4b | 32743 | + lockdep_off(); |
1facf9fc | 32744 | + unlock_rename(d1, d2); |
2cbb1c4b | 32745 | + lockdep_on(); |
1facf9fc | 32746 | +} |
32747 | + | |
32748 | +/* ---------------------------------------------------------------------- */ | |
32749 | + | |
b4510431 | 32750 | +int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl) |
1facf9fc | 32751 | +{ |
32752 | + int err; | |
32753 | + struct dentry *d; | |
32754 | + | |
32755 | + IMustLock(dir); | |
32756 | + | |
32757 | + d = path->dentry; | |
32758 | + path->dentry = d->d_parent; | |
b752ccd1 | 32759 | + err = security_path_mknod(path, d, mode, 0); |
1facf9fc | 32760 | + path->dentry = d; |
32761 | + if (unlikely(err)) | |
32762 | + goto out; | |
32763 | + | |
c1595e42 | 32764 | + lockdep_off(); |
b4510431 | 32765 | + err = vfs_create(dir, path->dentry, mode, want_excl); |
c1595e42 | 32766 | + lockdep_on(); |
1facf9fc | 32767 | + if (!err) { |
32768 | + struct path tmp = *path; | |
32769 | + int did; | |
32770 | + | |
32771 | + vfsub_update_h_iattr(&tmp, &did); | |
32772 | + if (did) { | |
32773 | + tmp.dentry = path->dentry->d_parent; | |
32774 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32775 | + } | |
32776 | + /*ignore*/ | |
32777 | + } | |
32778 | + | |
4f0767ce | 32779 | +out: |
1facf9fc | 32780 | + return err; |
32781 | +} | |
32782 | + | |
32783 | +int vfsub_symlink(struct inode *dir, struct path *path, const char *symname) | |
32784 | +{ | |
32785 | + int err; | |
32786 | + struct dentry *d; | |
32787 | + | |
32788 | + IMustLock(dir); | |
32789 | + | |
32790 | + d = path->dentry; | |
32791 | + path->dentry = d->d_parent; | |
b752ccd1 | 32792 | + err = security_path_symlink(path, d, symname); |
1facf9fc | 32793 | + path->dentry = d; |
32794 | + if (unlikely(err)) | |
32795 | + goto out; | |
32796 | + | |
c1595e42 | 32797 | + lockdep_off(); |
1facf9fc | 32798 | + err = vfs_symlink(dir, path->dentry, symname); |
c1595e42 | 32799 | + lockdep_on(); |
1facf9fc | 32800 | + if (!err) { |
32801 | + struct path tmp = *path; | |
32802 | + int did; | |
32803 | + | |
32804 | + vfsub_update_h_iattr(&tmp, &did); | |
32805 | + if (did) { | |
32806 | + tmp.dentry = path->dentry->d_parent; | |
32807 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32808 | + } | |
32809 | + /*ignore*/ | |
32810 | + } | |
32811 | + | |
4f0767ce | 32812 | +out: |
1facf9fc | 32813 | + return err; |
32814 | +} | |
32815 | + | |
32816 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev) | |
32817 | +{ | |
32818 | + int err; | |
32819 | + struct dentry *d; | |
32820 | + | |
32821 | + IMustLock(dir); | |
32822 | + | |
32823 | + d = path->dentry; | |
32824 | + path->dentry = d->d_parent; | |
027c5e7a | 32825 | + err = security_path_mknod(path, d, mode, new_encode_dev(dev)); |
1facf9fc | 32826 | + path->dentry = d; |
32827 | + if (unlikely(err)) | |
32828 | + goto out; | |
32829 | + | |
c1595e42 | 32830 | + lockdep_off(); |
1facf9fc | 32831 | + err = vfs_mknod(dir, path->dentry, mode, dev); |
c1595e42 | 32832 | + lockdep_on(); |
1facf9fc | 32833 | + if (!err) { |
32834 | + struct path tmp = *path; | |
32835 | + int did; | |
32836 | + | |
32837 | + vfsub_update_h_iattr(&tmp, &did); | |
32838 | + if (did) { | |
32839 | + tmp.dentry = path->dentry->d_parent; | |
32840 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32841 | + } | |
32842 | + /*ignore*/ | |
32843 | + } | |
32844 | + | |
4f0767ce | 32845 | +out: |
1facf9fc | 32846 | + return err; |
32847 | +} | |
32848 | + | |
32849 | +static int au_test_nlink(struct inode *inode) | |
32850 | +{ | |
32851 | + const unsigned int link_max = UINT_MAX >> 1; /* rough margin */ | |
32852 | + | |
32853 | + if (!au_test_fs_no_limit_nlink(inode->i_sb) | |
32854 | + || inode->i_nlink < link_max) | |
32855 | + return 0; | |
32856 | + return -EMLINK; | |
32857 | +} | |
32858 | + | |
523b37e3 AM |
32859 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path, |
32860 | + struct inode **delegated_inode) | |
1facf9fc | 32861 | +{ |
32862 | + int err; | |
32863 | + struct dentry *d; | |
32864 | + | |
32865 | + IMustLock(dir); | |
32866 | + | |
5527c038 | 32867 | + err = au_test_nlink(d_inode(src_dentry)); |
1facf9fc | 32868 | + if (unlikely(err)) |
32869 | + return err; | |
32870 | + | |
b4510431 | 32871 | + /* we don't call may_linkat() */ |
1facf9fc | 32872 | + d = path->dentry; |
32873 | + path->dentry = d->d_parent; | |
b752ccd1 | 32874 | + err = security_path_link(src_dentry, path, d); |
1facf9fc | 32875 | + path->dentry = d; |
32876 | + if (unlikely(err)) | |
32877 | + goto out; | |
32878 | + | |
2cbb1c4b | 32879 | + lockdep_off(); |
523b37e3 | 32880 | + err = vfs_link(src_dentry, dir, path->dentry, delegated_inode); |
2cbb1c4b | 32881 | + lockdep_on(); |
1facf9fc | 32882 | + if (!err) { |
32883 | + struct path tmp = *path; | |
32884 | + int did; | |
32885 | + | |
32886 | + /* fuse has different memory inode for the same inumber */ | |
32887 | + vfsub_update_h_iattr(&tmp, &did); | |
32888 | + if (did) { | |
32889 | + tmp.dentry = path->dentry->d_parent; | |
32890 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32891 | + tmp.dentry = src_dentry; | |
32892 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32893 | + } | |
32894 | + /*ignore*/ | |
32895 | + } | |
32896 | + | |
4f0767ce | 32897 | +out: |
1facf9fc | 32898 | + return err; |
32899 | +} | |
32900 | + | |
32901 | +int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry, | |
523b37e3 | 32902 | + struct inode *dir, struct path *path, |
f2c43d5f | 32903 | + struct inode **delegated_inode, unsigned int flags) |
1facf9fc | 32904 | +{ |
32905 | + int err; | |
32906 | + struct path tmp = { | |
32907 | + .mnt = path->mnt | |
32908 | + }; | |
32909 | + struct dentry *d; | |
32910 | + | |
32911 | + IMustLock(dir); | |
32912 | + IMustLock(src_dir); | |
32913 | + | |
32914 | + d = path->dentry; | |
32915 | + path->dentry = d->d_parent; | |
32916 | + tmp.dentry = src_dentry->d_parent; | |
38d290e6 | 32917 | + err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0); |
1facf9fc | 32918 | + path->dentry = d; |
32919 | + if (unlikely(err)) | |
32920 | + goto out; | |
32921 | + | |
2cbb1c4b | 32922 | + lockdep_off(); |
523b37e3 | 32923 | + err = vfs_rename(src_dir, src_dentry, dir, path->dentry, |
f2c43d5f | 32924 | + delegated_inode, flags); |
2cbb1c4b | 32925 | + lockdep_on(); |
1facf9fc | 32926 | + if (!err) { |
32927 | + int did; | |
32928 | + | |
32929 | + tmp.dentry = d->d_parent; | |
32930 | + vfsub_update_h_iattr(&tmp, &did); | |
32931 | + if (did) { | |
32932 | + tmp.dentry = src_dentry; | |
32933 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32934 | + tmp.dentry = src_dentry->d_parent; | |
32935 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32936 | + } | |
32937 | + /*ignore*/ | |
32938 | + } | |
32939 | + | |
4f0767ce | 32940 | +out: |
1facf9fc | 32941 | + return err; |
32942 | +} | |
32943 | + | |
32944 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode) | |
32945 | +{ | |
32946 | + int err; | |
32947 | + struct dentry *d; | |
32948 | + | |
32949 | + IMustLock(dir); | |
32950 | + | |
32951 | + d = path->dentry; | |
32952 | + path->dentry = d->d_parent; | |
b752ccd1 | 32953 | + err = security_path_mkdir(path, d, mode); |
1facf9fc | 32954 | + path->dentry = d; |
32955 | + if (unlikely(err)) | |
32956 | + goto out; | |
32957 | + | |
c1595e42 | 32958 | + lockdep_off(); |
1facf9fc | 32959 | + err = vfs_mkdir(dir, path->dentry, mode); |
c1595e42 | 32960 | + lockdep_on(); |
1facf9fc | 32961 | + if (!err) { |
32962 | + struct path tmp = *path; | |
32963 | + int did; | |
32964 | + | |
32965 | + vfsub_update_h_iattr(&tmp, &did); | |
32966 | + if (did) { | |
32967 | + tmp.dentry = path->dentry->d_parent; | |
32968 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
32969 | + } | |
32970 | + /*ignore*/ | |
32971 | + } | |
32972 | + | |
4f0767ce | 32973 | +out: |
1facf9fc | 32974 | + return err; |
32975 | +} | |
32976 | + | |
32977 | +int vfsub_rmdir(struct inode *dir, struct path *path) | |
32978 | +{ | |
32979 | + int err; | |
32980 | + struct dentry *d; | |
32981 | + | |
32982 | + IMustLock(dir); | |
32983 | + | |
32984 | + d = path->dentry; | |
32985 | + path->dentry = d->d_parent; | |
b752ccd1 | 32986 | + err = security_path_rmdir(path, d); |
1facf9fc | 32987 | + path->dentry = d; |
32988 | + if (unlikely(err)) | |
32989 | + goto out; | |
32990 | + | |
2cbb1c4b | 32991 | + lockdep_off(); |
1facf9fc | 32992 | + err = vfs_rmdir(dir, path->dentry); |
2cbb1c4b | 32993 | + lockdep_on(); |
1facf9fc | 32994 | + if (!err) { |
32995 | + struct path tmp = { | |
32996 | + .dentry = path->dentry->d_parent, | |
32997 | + .mnt = path->mnt | |
32998 | + }; | |
32999 | + | |
33000 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
33001 | + } | |
33002 | + | |
4f0767ce | 33003 | +out: |
1facf9fc | 33004 | + return err; |
33005 | +} | |
33006 | + | |
33007 | +/* ---------------------------------------------------------------------- */ | |
33008 | + | |
9dbd164d | 33009 | +/* todo: support mmap_sem? */ |
1facf9fc | 33010 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, |
33011 | + loff_t *ppos) | |
33012 | +{ | |
33013 | + ssize_t err; | |
33014 | + | |
2cbb1c4b | 33015 | + lockdep_off(); |
1facf9fc | 33016 | + err = vfs_read(file, ubuf, count, ppos); |
2cbb1c4b | 33017 | + lockdep_on(); |
1facf9fc | 33018 | + if (err >= 0) |
33019 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
33020 | + return err; | |
33021 | +} | |
33022 | + | |
33023 | +/* todo: kernel_read()? */ | |
33024 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
33025 | + loff_t *ppos) | |
33026 | +{ | |
33027 | + ssize_t err; | |
33028 | + mm_segment_t oldfs; | |
b752ccd1 AM |
33029 | + union { |
33030 | + void *k; | |
33031 | + char __user *u; | |
33032 | + } buf; | |
1facf9fc | 33033 | + |
b752ccd1 | 33034 | + buf.k = kbuf; |
1facf9fc | 33035 | + oldfs = get_fs(); |
33036 | + set_fs(KERNEL_DS); | |
b752ccd1 | 33037 | + err = vfsub_read_u(file, buf.u, count, ppos); |
1facf9fc | 33038 | + set_fs(oldfs); |
33039 | + return err; | |
33040 | +} | |
33041 | + | |
33042 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
33043 | + loff_t *ppos) | |
33044 | +{ | |
33045 | + ssize_t err; | |
33046 | + | |
2cbb1c4b | 33047 | + lockdep_off(); |
1facf9fc | 33048 | + err = vfs_write(file, ubuf, count, ppos); |
2cbb1c4b | 33049 | + lockdep_on(); |
1facf9fc | 33050 | + if (err >= 0) |
33051 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
33052 | + return err; | |
33053 | +} | |
33054 | + | |
33055 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos) | |
33056 | +{ | |
33057 | + ssize_t err; | |
33058 | + mm_segment_t oldfs; | |
b752ccd1 AM |
33059 | + union { |
33060 | + void *k; | |
33061 | + const char __user *u; | |
33062 | + } buf; | |
1facf9fc | 33063 | + |
b752ccd1 | 33064 | + buf.k = kbuf; |
1facf9fc | 33065 | + oldfs = get_fs(); |
33066 | + set_fs(KERNEL_DS); | |
b752ccd1 | 33067 | + err = vfsub_write_u(file, buf.u, count, ppos); |
1facf9fc | 33068 | + set_fs(oldfs); |
33069 | + return err; | |
33070 | +} | |
33071 | + | |
4a4d8108 AM |
33072 | +int vfsub_flush(struct file *file, fl_owner_t id) |
33073 | +{ | |
33074 | + int err; | |
33075 | + | |
33076 | + err = 0; | |
523b37e3 | 33077 | + if (file->f_op->flush) { |
2000de60 | 33078 | + if (!au_test_nfs(file->f_path.dentry->d_sb)) |
2cbb1c4b JR |
33079 | + err = file->f_op->flush(file, id); |
33080 | + else { | |
33081 | + lockdep_off(); | |
33082 | + err = file->f_op->flush(file, id); | |
33083 | + lockdep_on(); | |
33084 | + } | |
4a4d8108 AM |
33085 | + if (!err) |
33086 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); | |
33087 | + /*ignore*/ | |
33088 | + } | |
33089 | + return err; | |
33090 | +} | |
33091 | + | |
392086de | 33092 | +int vfsub_iterate_dir(struct file *file, struct dir_context *ctx) |
1facf9fc | 33093 | +{ |
33094 | + int err; | |
33095 | + | |
062440b3 | 33096 | + AuDbg("%pD, ctx{%ps, %llu}\n", file, ctx->actor, ctx->pos); |
392086de | 33097 | + |
2cbb1c4b | 33098 | + lockdep_off(); |
392086de | 33099 | + err = iterate_dir(file, ctx); |
2cbb1c4b | 33100 | + lockdep_on(); |
1facf9fc | 33101 | + if (err >= 0) |
33102 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
1c60b727 | 33103 | + |
1facf9fc | 33104 | + return err; |
33105 | +} | |
33106 | + | |
33107 | +long vfsub_splice_to(struct file *in, loff_t *ppos, | |
33108 | + struct pipe_inode_info *pipe, size_t len, | |
33109 | + unsigned int flags) | |
33110 | +{ | |
33111 | + long err; | |
33112 | + | |
2cbb1c4b | 33113 | + lockdep_off(); |
0fc653ad | 33114 | + err = do_splice_to(in, ppos, pipe, len, flags); |
2cbb1c4b | 33115 | + lockdep_on(); |
4a4d8108 | 33116 | + file_accessed(in); |
1facf9fc | 33117 | + if (err >= 0) |
33118 | + vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/ | |
33119 | + return err; | |
33120 | +} | |
33121 | + | |
33122 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
33123 | + loff_t *ppos, size_t len, unsigned int flags) | |
33124 | +{ | |
33125 | + long err; | |
33126 | + | |
2cbb1c4b | 33127 | + lockdep_off(); |
0fc653ad | 33128 | + err = do_splice_from(pipe, out, ppos, len, flags); |
2cbb1c4b | 33129 | + lockdep_on(); |
1facf9fc | 33130 | + if (err >= 0) |
33131 | + vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/ | |
33132 | + return err; | |
33133 | +} | |
33134 | + | |
53392da6 AM |
33135 | +int vfsub_fsync(struct file *file, struct path *path, int datasync) |
33136 | +{ | |
33137 | + int err; | |
33138 | + | |
33139 | + /* file can be NULL */ | |
33140 | + lockdep_off(); | |
33141 | + err = vfs_fsync(file, datasync); | |
33142 | + lockdep_on(); | |
33143 | + if (!err) { | |
33144 | + if (!path) { | |
33145 | + AuDebugOn(!file); | |
33146 | + path = &file->f_path; | |
33147 | + } | |
33148 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ | |
33149 | + } | |
33150 | + return err; | |
33151 | +} | |
33152 | + | |
1facf9fc | 33153 | +/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */ |
33154 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
33155 | + struct file *h_file) | |
33156 | +{ | |
33157 | + int err; | |
33158 | + struct inode *h_inode; | |
c06a8ce3 | 33159 | + struct super_block *h_sb; |
1facf9fc | 33160 | + |
1facf9fc | 33161 | + if (!h_file) { |
c06a8ce3 AM |
33162 | + err = vfsub_truncate(h_path, length); |
33163 | + goto out; | |
1facf9fc | 33164 | + } |
33165 | + | |
5527c038 | 33166 | + h_inode = d_inode(h_path->dentry); |
c06a8ce3 AM |
33167 | + h_sb = h_inode->i_sb; |
33168 | + lockdep_off(); | |
33169 | + sb_start_write(h_sb); | |
33170 | + lockdep_on(); | |
1facf9fc | 33171 | + err = locks_verify_truncate(h_inode, h_file, length); |
33172 | + if (!err) | |
953406b4 | 33173 | + err = security_path_truncate(h_path); |
2cbb1c4b JR |
33174 | + if (!err) { |
33175 | + lockdep_off(); | |
1facf9fc | 33176 | + err = do_truncate(h_path->dentry, length, attr, h_file); |
2cbb1c4b JR |
33177 | + lockdep_on(); |
33178 | + } | |
c06a8ce3 AM |
33179 | + lockdep_off(); |
33180 | + sb_end_write(h_sb); | |
33181 | + lockdep_on(); | |
1facf9fc | 33182 | + |
4f0767ce | 33183 | +out: |
1facf9fc | 33184 | + return err; |
33185 | +} | |
33186 | + | |
33187 | +/* ---------------------------------------------------------------------- */ | |
33188 | + | |
33189 | +struct au_vfsub_mkdir_args { | |
33190 | + int *errp; | |
33191 | + struct inode *dir; | |
33192 | + struct path *path; | |
33193 | + int mode; | |
33194 | +}; | |
33195 | + | |
33196 | +static void au_call_vfsub_mkdir(void *args) | |
33197 | +{ | |
33198 | + struct au_vfsub_mkdir_args *a = args; | |
33199 | + *a->errp = vfsub_mkdir(a->dir, a->path, a->mode); | |
33200 | +} | |
33201 | + | |
33202 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode) | |
33203 | +{ | |
33204 | + int err, do_sio, wkq_err; | |
33205 | + | |
33206 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
c1595e42 JR |
33207 | + if (!do_sio) { |
33208 | + lockdep_off(); | |
1facf9fc | 33209 | + err = vfsub_mkdir(dir, path, mode); |
c1595e42 JR |
33210 | + lockdep_on(); |
33211 | + } else { | |
1facf9fc | 33212 | + struct au_vfsub_mkdir_args args = { |
33213 | + .errp = &err, | |
33214 | + .dir = dir, | |
33215 | + .path = path, | |
33216 | + .mode = mode | |
33217 | + }; | |
33218 | + wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args); | |
33219 | + if (unlikely(wkq_err)) | |
33220 | + err = wkq_err; | |
33221 | + } | |
33222 | + | |
33223 | + return err; | |
33224 | +} | |
33225 | + | |
33226 | +struct au_vfsub_rmdir_args { | |
33227 | + int *errp; | |
33228 | + struct inode *dir; | |
33229 | + struct path *path; | |
33230 | +}; | |
33231 | + | |
33232 | +static void au_call_vfsub_rmdir(void *args) | |
33233 | +{ | |
33234 | + struct au_vfsub_rmdir_args *a = args; | |
33235 | + *a->errp = vfsub_rmdir(a->dir, a->path); | |
33236 | +} | |
33237 | + | |
33238 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path) | |
33239 | +{ | |
33240 | + int err, do_sio, wkq_err; | |
33241 | + | |
33242 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
c1595e42 JR |
33243 | + if (!do_sio) { |
33244 | + lockdep_off(); | |
1facf9fc | 33245 | + err = vfsub_rmdir(dir, path); |
c1595e42 JR |
33246 | + lockdep_on(); |
33247 | + } else { | |
1facf9fc | 33248 | + struct au_vfsub_rmdir_args args = { |
33249 | + .errp = &err, | |
33250 | + .dir = dir, | |
33251 | + .path = path | |
33252 | + }; | |
33253 | + wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args); | |
33254 | + if (unlikely(wkq_err)) | |
33255 | + err = wkq_err; | |
33256 | + } | |
33257 | + | |
33258 | + return err; | |
33259 | +} | |
33260 | + | |
33261 | +/* ---------------------------------------------------------------------- */ | |
33262 | + | |
33263 | +struct notify_change_args { | |
33264 | + int *errp; | |
33265 | + struct path *path; | |
33266 | + struct iattr *ia; | |
523b37e3 | 33267 | + struct inode **delegated_inode; |
1facf9fc | 33268 | +}; |
33269 | + | |
33270 | +static void call_notify_change(void *args) | |
33271 | +{ | |
33272 | + struct notify_change_args *a = args; | |
33273 | + struct inode *h_inode; | |
33274 | + | |
5527c038 | 33275 | + h_inode = d_inode(a->path->dentry); |
1facf9fc | 33276 | + IMustLock(h_inode); |
33277 | + | |
33278 | + *a->errp = -EPERM; | |
33279 | + if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) { | |
c1595e42 | 33280 | + lockdep_off(); |
523b37e3 AM |
33281 | + *a->errp = notify_change(a->path->dentry, a->ia, |
33282 | + a->delegated_inode); | |
c1595e42 | 33283 | + lockdep_on(); |
1facf9fc | 33284 | + if (!*a->errp) |
33285 | + vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/ | |
33286 | + } | |
33287 | + AuTraceErr(*a->errp); | |
33288 | +} | |
33289 | + | |
523b37e3 AM |
33290 | +int vfsub_notify_change(struct path *path, struct iattr *ia, |
33291 | + struct inode **delegated_inode) | |
1facf9fc | 33292 | +{ |
33293 | + int err; | |
33294 | + struct notify_change_args args = { | |
523b37e3 AM |
33295 | + .errp = &err, |
33296 | + .path = path, | |
33297 | + .ia = ia, | |
33298 | + .delegated_inode = delegated_inode | |
1facf9fc | 33299 | + }; |
33300 | + | |
33301 | + call_notify_change(&args); | |
33302 | + | |
33303 | + return err; | |
33304 | +} | |
33305 | + | |
523b37e3 AM |
33306 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia, |
33307 | + struct inode **delegated_inode) | |
1facf9fc | 33308 | +{ |
33309 | + int err, wkq_err; | |
33310 | + struct notify_change_args args = { | |
523b37e3 AM |
33311 | + .errp = &err, |
33312 | + .path = path, | |
33313 | + .ia = ia, | |
33314 | + .delegated_inode = delegated_inode | |
1facf9fc | 33315 | + }; |
33316 | + | |
33317 | + wkq_err = au_wkq_wait(call_notify_change, &args); | |
33318 | + if (unlikely(wkq_err)) | |
33319 | + err = wkq_err; | |
33320 | + | |
33321 | + return err; | |
33322 | +} | |
33323 | + | |
33324 | +/* ---------------------------------------------------------------------- */ | |
33325 | + | |
33326 | +struct unlink_args { | |
33327 | + int *errp; | |
33328 | + struct inode *dir; | |
33329 | + struct path *path; | |
523b37e3 | 33330 | + struct inode **delegated_inode; |
1facf9fc | 33331 | +}; |
33332 | + | |
33333 | +static void call_unlink(void *args) | |
33334 | +{ | |
33335 | + struct unlink_args *a = args; | |
33336 | + struct dentry *d = a->path->dentry; | |
33337 | + struct inode *h_inode; | |
33338 | + const int stop_sillyrename = (au_test_nfs(d->d_sb) | |
c1595e42 | 33339 | + && au_dcount(d) == 1); |
1facf9fc | 33340 | + |
33341 | + IMustLock(a->dir); | |
33342 | + | |
33343 | + a->path->dentry = d->d_parent; | |
33344 | + *a->errp = security_path_unlink(a->path, d); | |
33345 | + a->path->dentry = d; | |
33346 | + if (unlikely(*a->errp)) | |
33347 | + return; | |
33348 | + | |
33349 | + if (!stop_sillyrename) | |
33350 | + dget(d); | |
5527c038 JR |
33351 | + h_inode = NULL; |
33352 | + if (d_is_positive(d)) { | |
33353 | + h_inode = d_inode(d); | |
027c5e7a | 33354 | + ihold(h_inode); |
5527c038 | 33355 | + } |
1facf9fc | 33356 | + |
2cbb1c4b | 33357 | + lockdep_off(); |
523b37e3 | 33358 | + *a->errp = vfs_unlink(a->dir, d, a->delegated_inode); |
2cbb1c4b | 33359 | + lockdep_on(); |
1facf9fc | 33360 | + if (!*a->errp) { |
33361 | + struct path tmp = { | |
33362 | + .dentry = d->d_parent, | |
33363 | + .mnt = a->path->mnt | |
33364 | + }; | |
33365 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
33366 | + } | |
33367 | + | |
33368 | + if (!stop_sillyrename) | |
33369 | + dput(d); | |
33370 | + if (h_inode) | |
33371 | + iput(h_inode); | |
33372 | + | |
33373 | + AuTraceErr(*a->errp); | |
33374 | +} | |
33375 | + | |
33376 | +/* | |
33377 | + * @dir: must be locked. | |
33378 | + * @dentry: target dentry. | |
33379 | + */ | |
523b37e3 AM |
33380 | +int vfsub_unlink(struct inode *dir, struct path *path, |
33381 | + struct inode **delegated_inode, int force) | |
1facf9fc | 33382 | +{ |
33383 | + int err; | |
33384 | + struct unlink_args args = { | |
523b37e3 AM |
33385 | + .errp = &err, |
33386 | + .dir = dir, | |
33387 | + .path = path, | |
33388 | + .delegated_inode = delegated_inode | |
1facf9fc | 33389 | + }; |
33390 | + | |
33391 | + if (!force) | |
33392 | + call_unlink(&args); | |
33393 | + else { | |
33394 | + int wkq_err; | |
33395 | + | |
33396 | + wkq_err = au_wkq_wait(call_unlink, &args); | |
33397 | + if (unlikely(wkq_err)) | |
33398 | + err = wkq_err; | |
33399 | + } | |
33400 | + | |
33401 | + return err; | |
33402 | +} | |
7f207e10 AM |
33403 | diff -urN /usr/share/empty/fs/aufs/vfsub.h linux/fs/aufs/vfsub.h |
33404 | --- /usr/share/empty/fs/aufs/vfsub.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 33405 | +++ linux/fs/aufs/vfsub.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
33406 | @@ -0,0 +1,355 @@ |
33407 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 33408 | +/* |
b00004a5 | 33409 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 33410 | + * |
33411 | + * This program, aufs is free software; you can redistribute it and/or modify | |
33412 | + * it under the terms of the GNU General Public License as published by | |
33413 | + * the Free Software Foundation; either version 2 of the License, or | |
33414 | + * (at your option) any later version. | |
dece6358 AM |
33415 | + * |
33416 | + * This program is distributed in the hope that it will be useful, | |
33417 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
33418 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
33419 | + * GNU General Public License for more details. | |
33420 | + * | |
33421 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 33422 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 33423 | + */ |
33424 | + | |
33425 | +/* | |
33426 | + * sub-routines for VFS | |
33427 | + */ | |
33428 | + | |
33429 | +#ifndef __AUFS_VFSUB_H__ | |
33430 | +#define __AUFS_VFSUB_H__ | |
33431 | + | |
33432 | +#ifdef __KERNEL__ | |
33433 | + | |
33434 | +#include <linux/fs.h> | |
be118d29 | 33435 | +#include <linux/iversion.h> |
b4510431 | 33436 | +#include <linux/mount.h> |
8cdd5066 | 33437 | +#include <linux/posix_acl.h> |
c1595e42 | 33438 | +#include <linux/xattr.h> |
7f207e10 | 33439 | +#include "debug.h" |
1facf9fc | 33440 | + |
7f207e10 | 33441 | +/* copied from linux/fs/internal.h */ |
2cbb1c4b | 33442 | +/* todo: BAD approach!! */ |
c06a8ce3 | 33443 | +extern void __mnt_drop_write(struct vfsmount *); |
c4adf169 | 33444 | +extern int open_check_o_direct(struct file *f); |
7f207e10 AM |
33445 | + |
33446 | +/* ---------------------------------------------------------------------- */ | |
1facf9fc | 33447 | + |
33448 | +/* lock subclass for lower inode */ | |
33449 | +/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */ | |
33450 | +/* reduce? gave up. */ | |
33451 | +enum { | |
c1595e42 | 33452 | + AuLsc_I_Begin = I_MUTEX_PARENT2, /* 5 */ |
1facf9fc | 33453 | + AuLsc_I_PARENT, /* lower inode, parent first */ |
33454 | + AuLsc_I_PARENT2, /* copyup dirs */ | |
dece6358 | 33455 | + AuLsc_I_PARENT3, /* copyup wh */ |
1facf9fc | 33456 | + AuLsc_I_CHILD, |
33457 | + AuLsc_I_CHILD2, | |
33458 | + AuLsc_I_End | |
33459 | +}; | |
33460 | + | |
33461 | +/* to debug easier, do not make them inlined functions */ | |
33462 | +#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx)) | |
febd17d6 | 33463 | +#define IMustLock(i) AuDebugOn(!inode_is_locked(i)) |
1facf9fc | 33464 | + |
33465 | +/* ---------------------------------------------------------------------- */ | |
33466 | + | |
7f207e10 AM |
33467 | +static inline void vfsub_drop_nlink(struct inode *inode) |
33468 | +{ | |
33469 | + AuDebugOn(!inode->i_nlink); | |
33470 | + drop_nlink(inode); | |
33471 | +} | |
33472 | + | |
027c5e7a AM |
33473 | +static inline void vfsub_dead_dir(struct inode *inode) |
33474 | +{ | |
33475 | + AuDebugOn(!S_ISDIR(inode->i_mode)); | |
33476 | + inode->i_flags |= S_DEAD; | |
33477 | + clear_nlink(inode); | |
33478 | +} | |
33479 | + | |
392086de AM |
33480 | +static inline int vfsub_native_ro(struct inode *inode) |
33481 | +{ | |
8b6a4947 | 33482 | + return sb_rdonly(inode->i_sb) |
392086de AM |
33483 | + || IS_RDONLY(inode) |
33484 | + /* || IS_APPEND(inode) */ | |
33485 | + || IS_IMMUTABLE(inode); | |
33486 | +} | |
33487 | + | |
8cdd5066 JR |
33488 | +#ifdef CONFIG_AUFS_BR_FUSE |
33489 | +int vfsub_test_mntns(struct vfsmount *mnt, struct super_block *h_sb); | |
33490 | +#else | |
33491 | +AuStubInt0(vfsub_test_mntns, struct vfsmount *mnt, struct super_block *h_sb); | |
33492 | +#endif | |
33493 | + | |
a2654f78 AM |
33494 | +int vfsub_sync_filesystem(struct super_block *h_sb, int wait); |
33495 | + | |
7f207e10 AM |
33496 | +/* ---------------------------------------------------------------------- */ |
33497 | + | |
33498 | +int vfsub_update_h_iattr(struct path *h_path, int *did); | |
33499 | +struct file *vfsub_dentry_open(struct path *path, int flags); | |
33500 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode); | |
b912730e AM |
33501 | +struct vfsub_aopen_args { |
33502 | + struct file *file; | |
33503 | + unsigned int open_flag; | |
33504 | + umode_t create_mode; | |
33505 | + int *opened; | |
33506 | +}; | |
33507 | +struct au_branch; | |
33508 | +int vfsub_atomic_open(struct inode *dir, struct dentry *dentry, | |
33509 | + struct vfsub_aopen_args *args, struct au_branch *br); | |
1facf9fc | 33510 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path); |
b4510431 | 33511 | + |
febd17d6 JR |
33512 | +struct dentry *vfsub_lookup_one_len_unlocked(const char *name, |
33513 | + struct dentry *parent, int len); | |
1facf9fc | 33514 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, |
33515 | + int len); | |
b4510431 AM |
33516 | + |
33517 | +struct vfsub_lkup_one_args { | |
33518 | + struct dentry **errp; | |
33519 | + struct qstr *name; | |
33520 | + struct dentry *parent; | |
33521 | +}; | |
33522 | + | |
33523 | +static inline struct dentry *vfsub_lkup_one(struct qstr *name, | |
33524 | + struct dentry *parent) | |
33525 | +{ | |
33526 | + return vfsub_lookup_one_len(name->name, parent, name->len); | |
33527 | +} | |
33528 | + | |
33529 | +void vfsub_call_lkup_one(void *args); | |
33530 | + | |
33531 | +/* ---------------------------------------------------------------------- */ | |
33532 | + | |
33533 | +static inline int vfsub_mnt_want_write(struct vfsmount *mnt) | |
33534 | +{ | |
33535 | + int err; | |
076b876e | 33536 | + |
b4510431 AM |
33537 | + lockdep_off(); |
33538 | + err = mnt_want_write(mnt); | |
33539 | + lockdep_on(); | |
33540 | + return err; | |
33541 | +} | |
33542 | + | |
33543 | +static inline void vfsub_mnt_drop_write(struct vfsmount *mnt) | |
33544 | +{ | |
33545 | + lockdep_off(); | |
33546 | + mnt_drop_write(mnt); | |
33547 | + lockdep_on(); | |
33548 | +} | |
1facf9fc | 33549 | + |
7e9cd9fe | 33550 | +#if 0 /* reserved */ |
c06a8ce3 AM |
33551 | +static inline void vfsub_mnt_drop_write_file(struct file *file) |
33552 | +{ | |
33553 | + lockdep_off(); | |
33554 | + mnt_drop_write_file(file); | |
33555 | + lockdep_on(); | |
33556 | +} | |
7e9cd9fe | 33557 | +#endif |
c06a8ce3 | 33558 | + |
1facf9fc | 33559 | +/* ---------------------------------------------------------------------- */ |
33560 | + | |
33561 | +struct au_hinode; | |
33562 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
33563 | + struct dentry *d2, struct au_hinode *hdir2); | |
33564 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
33565 | + struct dentry *d2, struct au_hinode *hdir2); | |
33566 | + | |
537831f9 AM |
33567 | +int vfsub_create(struct inode *dir, struct path *path, int mode, |
33568 | + bool want_excl); | |
1facf9fc | 33569 | +int vfsub_symlink(struct inode *dir, struct path *path, |
33570 | + const char *symname); | |
33571 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev); | |
33572 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, | |
523b37e3 | 33573 | + struct path *path, struct inode **delegated_inode); |
1facf9fc | 33574 | +int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry, |
523b37e3 | 33575 | + struct inode *hdir, struct path *path, |
f2c43d5f | 33576 | + struct inode **delegated_inode, unsigned int flags); |
1facf9fc | 33577 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode); |
33578 | +int vfsub_rmdir(struct inode *dir, struct path *path); | |
33579 | + | |
33580 | +/* ---------------------------------------------------------------------- */ | |
33581 | + | |
33582 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
33583 | + loff_t *ppos); | |
33584 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
33585 | + loff_t *ppos); | |
33586 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
33587 | + loff_t *ppos); | |
33588 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, | |
33589 | + loff_t *ppos); | |
4a4d8108 | 33590 | +int vfsub_flush(struct file *file, fl_owner_t id); |
392086de AM |
33591 | +int vfsub_iterate_dir(struct file *file, struct dir_context *ctx); |
33592 | + | |
c06a8ce3 AM |
33593 | +static inline loff_t vfsub_f_size_read(struct file *file) |
33594 | +{ | |
33595 | + return i_size_read(file_inode(file)); | |
33596 | +} | |
33597 | + | |
4a4d8108 AM |
33598 | +static inline unsigned int vfsub_file_flags(struct file *file) |
33599 | +{ | |
33600 | + unsigned int flags; | |
33601 | + | |
33602 | + spin_lock(&file->f_lock); | |
33603 | + flags = file->f_flags; | |
33604 | + spin_unlock(&file->f_lock); | |
33605 | + | |
33606 | + return flags; | |
33607 | +} | |
1308ab2a | 33608 | + |
f0c0a007 AM |
33609 | +static inline int vfsub_file_execed(struct file *file) |
33610 | +{ | |
33611 | + /* todo: direct access f_flags */ | |
33612 | + return !!(vfsub_file_flags(file) & __FMODE_EXEC); | |
33613 | +} | |
33614 | + | |
7e9cd9fe | 33615 | +#if 0 /* reserved */ |
1facf9fc | 33616 | +static inline void vfsub_file_accessed(struct file *h_file) |
33617 | +{ | |
33618 | + file_accessed(h_file); | |
33619 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/ | |
33620 | +} | |
7e9cd9fe | 33621 | +#endif |
1facf9fc | 33622 | + |
79b8bda9 | 33623 | +#if 0 /* reserved */ |
1facf9fc | 33624 | +static inline void vfsub_touch_atime(struct vfsmount *h_mnt, |
33625 | + struct dentry *h_dentry) | |
33626 | +{ | |
33627 | + struct path h_path = { | |
33628 | + .dentry = h_dentry, | |
33629 | + .mnt = h_mnt | |
33630 | + }; | |
92d182d2 | 33631 | + touch_atime(&h_path); |
1facf9fc | 33632 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ |
33633 | +} | |
79b8bda9 | 33634 | +#endif |
1facf9fc | 33635 | + |
cd7a4cd9 AM |
33636 | +static inline int vfsub_update_time(struct inode *h_inode, |
33637 | + struct timespec64 *ts, int flags) | |
0c3ec466 | 33638 | +{ |
5afbbe0d | 33639 | + return update_time(h_inode, ts, flags); |
0c3ec466 AM |
33640 | + /* no vfsub_update_h_iattr() since we don't have struct path */ |
33641 | +} | |
33642 | + | |
8cdd5066 JR |
33643 | +#ifdef CONFIG_FS_POSIX_ACL |
33644 | +static inline int vfsub_acl_chmod(struct inode *h_inode, umode_t h_mode) | |
33645 | +{ | |
33646 | + int err; | |
33647 | + | |
33648 | + err = posix_acl_chmod(h_inode, h_mode); | |
33649 | + if (err == -EOPNOTSUPP) | |
33650 | + err = 0; | |
33651 | + return err; | |
33652 | +} | |
33653 | +#else | |
33654 | +AuStubInt0(vfsub_acl_chmod, struct inode *h_inode, umode_t h_mode); | |
33655 | +#endif | |
33656 | + | |
4a4d8108 AM |
33657 | +long vfsub_splice_to(struct file *in, loff_t *ppos, |
33658 | + struct pipe_inode_info *pipe, size_t len, | |
33659 | + unsigned int flags); | |
33660 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
33661 | + loff_t *ppos, size_t len, unsigned int flags); | |
c06a8ce3 AM |
33662 | + |
33663 | +static inline long vfsub_truncate(struct path *path, loff_t length) | |
33664 | +{ | |
33665 | + long err; | |
076b876e | 33666 | + |
c06a8ce3 AM |
33667 | + lockdep_off(); |
33668 | + err = vfs_truncate(path, length); | |
33669 | + lockdep_on(); | |
33670 | + return err; | |
33671 | +} | |
33672 | + | |
4a4d8108 AM |
33673 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, |
33674 | + struct file *h_file); | |
53392da6 | 33675 | +int vfsub_fsync(struct file *file, struct path *path, int datasync); |
4a4d8108 | 33676 | + |
521ced18 JR |
33677 | +/* |
33678 | + * re-use branch fs's ioctl(FICLONE) while aufs itself doesn't support such | |
33679 | + * ioctl. | |
33680 | + */ | |
33681 | +static inline int vfsub_clone_file_range(struct file *src, struct file *dst, | |
33682 | + u64 len) | |
33683 | +{ | |
33684 | + int err; | |
33685 | + | |
33686 | + lockdep_off(); | |
33687 | + err = vfs_clone_file_range(src, 0, dst, 0, len); | |
33688 | + lockdep_on(); | |
33689 | + | |
33690 | + return err; | |
33691 | +} | |
33692 | + | |
33693 | +/* copy_file_range(2) is a systemcall */ | |
33694 | +static inline ssize_t vfsub_copy_file_range(struct file *src, loff_t src_pos, | |
33695 | + struct file *dst, loff_t dst_pos, | |
33696 | + size_t len, unsigned int flags) | |
33697 | +{ | |
33698 | + ssize_t ssz; | |
33699 | + | |
33700 | + lockdep_off(); | |
33701 | + ssz = vfs_copy_file_range(src, src_pos, dst, dst_pos, len, flags); | |
33702 | + lockdep_on(); | |
33703 | + | |
33704 | + return ssz; | |
33705 | +} | |
33706 | + | |
1facf9fc | 33707 | +/* ---------------------------------------------------------------------- */ |
33708 | + | |
33709 | +static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin) | |
33710 | +{ | |
33711 | + loff_t err; | |
33712 | + | |
2cbb1c4b | 33713 | + lockdep_off(); |
1facf9fc | 33714 | + err = vfs_llseek(file, offset, origin); |
2cbb1c4b | 33715 | + lockdep_on(); |
1facf9fc | 33716 | + return err; |
33717 | +} | |
33718 | + | |
33719 | +/* ---------------------------------------------------------------------- */ | |
33720 | + | |
4a4d8108 AM |
33721 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode); |
33722 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path); | |
523b37e3 AM |
33723 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia, |
33724 | + struct inode **delegated_inode); | |
33725 | +int vfsub_notify_change(struct path *path, struct iattr *ia, | |
33726 | + struct inode **delegated_inode); | |
33727 | +int vfsub_unlink(struct inode *dir, struct path *path, | |
33728 | + struct inode **delegated_inode, int force); | |
4a4d8108 | 33729 | + |
521ced18 JR |
33730 | +static inline int vfsub_getattr(const struct path *path, struct kstat *st) |
33731 | +{ | |
33732 | + return vfs_getattr(path, st, STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
33733 | +} | |
33734 | + | |
c1595e42 JR |
33735 | +/* ---------------------------------------------------------------------- */ |
33736 | + | |
33737 | +static inline int vfsub_setxattr(struct dentry *dentry, const char *name, | |
33738 | + const void *value, size_t size, int flags) | |
33739 | +{ | |
33740 | + int err; | |
33741 | + | |
33742 | + lockdep_off(); | |
33743 | + err = vfs_setxattr(dentry, name, value, size, flags); | |
33744 | + lockdep_on(); | |
33745 | + | |
33746 | + return err; | |
33747 | +} | |
33748 | + | |
33749 | +static inline int vfsub_removexattr(struct dentry *dentry, const char *name) | |
33750 | +{ | |
33751 | + int err; | |
33752 | + | |
33753 | + lockdep_off(); | |
33754 | + err = vfs_removexattr(dentry, name); | |
33755 | + lockdep_on(); | |
33756 | + | |
33757 | + return err; | |
33758 | +} | |
33759 | + | |
1facf9fc | 33760 | +#endif /* __KERNEL__ */ |
33761 | +#endif /* __AUFS_VFSUB_H__ */ | |
7f207e10 AM |
33762 | diff -urN /usr/share/empty/fs/aufs/wbr_policy.c linux/fs/aufs/wbr_policy.c |
33763 | --- /usr/share/empty/fs/aufs/wbr_policy.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 AM |
33764 | +++ linux/fs/aufs/wbr_policy.c 2018-08-12 23:43:05.463458173 +0200 |
33765 | @@ -0,0 +1,830 @@ | |
33766 | +// SPDX-License-Identifier: GPL-2.0 | |
1facf9fc | 33767 | +/* |
b00004a5 | 33768 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 33769 | + * |
33770 | + * This program, aufs is free software; you can redistribute it and/or modify | |
33771 | + * it under the terms of the GNU General Public License as published by | |
33772 | + * the Free Software Foundation; either version 2 of the License, or | |
33773 | + * (at your option) any later version. | |
dece6358 AM |
33774 | + * |
33775 | + * This program is distributed in the hope that it will be useful, | |
33776 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
33777 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
33778 | + * GNU General Public License for more details. | |
33779 | + * | |
33780 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 33781 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 33782 | + */ |
33783 | + | |
33784 | +/* | |
33785 | + * policies for selecting one among multiple writable branches | |
33786 | + */ | |
33787 | + | |
33788 | +#include <linux/statfs.h> | |
33789 | +#include "aufs.h" | |
33790 | + | |
33791 | +/* subset of cpup_attr() */ | |
33792 | +static noinline_for_stack | |
33793 | +int au_cpdown_attr(struct path *h_path, struct dentry *h_src) | |
33794 | +{ | |
33795 | + int err, sbits; | |
33796 | + struct iattr ia; | |
33797 | + struct inode *h_isrc; | |
33798 | + | |
5527c038 | 33799 | + h_isrc = d_inode(h_src); |
1facf9fc | 33800 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID; |
33801 | + ia.ia_mode = h_isrc->i_mode; | |
33802 | + ia.ia_uid = h_isrc->i_uid; | |
33803 | + ia.ia_gid = h_isrc->i_gid; | |
33804 | + sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID)); | |
5527c038 | 33805 | + au_cpup_attr_flags(d_inode(h_path->dentry), h_isrc->i_flags); |
523b37e3 AM |
33806 | + /* no delegation since it is just created */ |
33807 | + err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); | |
1facf9fc | 33808 | + |
33809 | + /* is this nfs only? */ | |
33810 | + if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) { | |
33811 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
33812 | + ia.ia_mode = h_isrc->i_mode; | |
523b37e3 | 33813 | + err = vfsub_sio_notify_change(h_path, &ia, /*delegated*/NULL); |
1facf9fc | 33814 | + } |
33815 | + | |
33816 | + return err; | |
33817 | +} | |
33818 | + | |
33819 | +#define AuCpdown_PARENT_OPQ 1 | |
33820 | +#define AuCpdown_WHED (1 << 1) | |
33821 | +#define AuCpdown_MADE_DIR (1 << 2) | |
33822 | +#define AuCpdown_DIROPQ (1 << 3) | |
33823 | +#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name) | |
7f207e10 AM |
33824 | +#define au_fset_cpdown(flags, name) \ |
33825 | + do { (flags) |= AuCpdown_##name; } while (0) | |
33826 | +#define au_fclr_cpdown(flags, name) \ | |
33827 | + do { (flags) &= ~AuCpdown_##name; } while (0) | |
1facf9fc | 33828 | + |
1facf9fc | 33829 | +static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst, |
c2b27bf2 | 33830 | + unsigned int *flags) |
1facf9fc | 33831 | +{ |
33832 | + int err; | |
33833 | + struct dentry *opq_dentry; | |
33834 | + | |
33835 | + opq_dentry = au_diropq_create(dentry, bdst); | |
33836 | + err = PTR_ERR(opq_dentry); | |
33837 | + if (IS_ERR(opq_dentry)) | |
33838 | + goto out; | |
33839 | + dput(opq_dentry); | |
c2b27bf2 | 33840 | + au_fset_cpdown(*flags, DIROPQ); |
1facf9fc | 33841 | + |
4f0767ce | 33842 | +out: |
1facf9fc | 33843 | + return err; |
33844 | +} | |
33845 | + | |
33846 | +static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent, | |
33847 | + struct inode *dir, aufs_bindex_t bdst) | |
33848 | +{ | |
33849 | + int err; | |
33850 | + struct path h_path; | |
33851 | + struct au_branch *br; | |
33852 | + | |
33853 | + br = au_sbr(dentry->d_sb, bdst); | |
33854 | + h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
33855 | + err = PTR_ERR(h_path.dentry); | |
33856 | + if (IS_ERR(h_path.dentry)) | |
33857 | + goto out; | |
33858 | + | |
33859 | + err = 0; | |
5527c038 | 33860 | + if (d_is_positive(h_path.dentry)) { |
86dc4139 | 33861 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 33862 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path, |
33863 | + dentry); | |
33864 | + } | |
33865 | + dput(h_path.dentry); | |
33866 | + | |
4f0767ce | 33867 | +out: |
1facf9fc | 33868 | + return err; |
33869 | +} | |
33870 | + | |
33871 | +static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
86dc4139 | 33872 | + struct au_pin *pin, |
1facf9fc | 33873 | + struct dentry *h_parent, void *arg) |
33874 | +{ | |
33875 | + int err, rerr; | |
5afbbe0d | 33876 | + aufs_bindex_t bopq, btop; |
1facf9fc | 33877 | + struct path h_path; |
33878 | + struct dentry *parent; | |
33879 | + struct inode *h_dir, *h_inode, *inode, *dir; | |
c2b27bf2 | 33880 | + unsigned int *flags = arg; |
1facf9fc | 33881 | + |
5afbbe0d | 33882 | + btop = au_dbtop(dentry); |
1facf9fc | 33883 | + /* dentry is di-locked */ |
33884 | + parent = dget_parent(dentry); | |
5527c038 JR |
33885 | + dir = d_inode(parent); |
33886 | + h_dir = d_inode(h_parent); | |
1facf9fc | 33887 | + AuDebugOn(h_dir != au_h_iptr(dir, bdst)); |
33888 | + IMustLock(h_dir); | |
33889 | + | |
86dc4139 | 33890 | + err = au_lkup_neg(dentry, bdst, /*wh*/0); |
1facf9fc | 33891 | + if (unlikely(err < 0)) |
33892 | + goto out; | |
33893 | + h_path.dentry = au_h_dptr(dentry, bdst); | |
33894 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst); | |
cd7a4cd9 | 33895 | + err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path, 0755); |
1facf9fc | 33896 | + if (unlikely(err)) |
33897 | + goto out_put; | |
c2b27bf2 | 33898 | + au_fset_cpdown(*flags, MADE_DIR); |
1facf9fc | 33899 | + |
1facf9fc | 33900 | + bopq = au_dbdiropq(dentry); |
c2b27bf2 AM |
33901 | + au_fclr_cpdown(*flags, WHED); |
33902 | + au_fclr_cpdown(*flags, DIROPQ); | |
1facf9fc | 33903 | + if (au_dbwh(dentry) == bdst) |
c2b27bf2 AM |
33904 | + au_fset_cpdown(*flags, WHED); |
33905 | + if (!au_ftest_cpdown(*flags, PARENT_OPQ) && bopq <= bdst) | |
33906 | + au_fset_cpdown(*flags, PARENT_OPQ); | |
5527c038 | 33907 | + h_inode = d_inode(h_path.dentry); |
febd17d6 | 33908 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
c2b27bf2 AM |
33909 | + if (au_ftest_cpdown(*flags, WHED)) { |
33910 | + err = au_cpdown_dir_opq(dentry, bdst, flags); | |
1facf9fc | 33911 | + if (unlikely(err)) { |
febd17d6 | 33912 | + inode_unlock(h_inode); |
1facf9fc | 33913 | + goto out_dir; |
33914 | + } | |
33915 | + } | |
33916 | + | |
5afbbe0d | 33917 | + err = au_cpdown_attr(&h_path, au_h_dptr(dentry, btop)); |
febd17d6 | 33918 | + inode_unlock(h_inode); |
1facf9fc | 33919 | + if (unlikely(err)) |
33920 | + goto out_opq; | |
33921 | + | |
c2b27bf2 | 33922 | + if (au_ftest_cpdown(*flags, WHED)) { |
1facf9fc | 33923 | + err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst); |
33924 | + if (unlikely(err)) | |
33925 | + goto out_opq; | |
33926 | + } | |
33927 | + | |
5527c038 | 33928 | + inode = d_inode(dentry); |
5afbbe0d AM |
33929 | + if (au_ibbot(inode) < bdst) |
33930 | + au_set_ibbot(inode, bdst); | |
1facf9fc | 33931 | + au_set_h_iptr(inode, bdst, au_igrab(h_inode), |
33932 | + au_hi_flags(inode, /*isdir*/1)); | |
076b876e | 33933 | + au_fhsm_wrote(dentry->d_sb, bdst, /*force*/0); |
1facf9fc | 33934 | + goto out; /* success */ |
33935 | + | |
33936 | + /* revert */ | |
4f0767ce | 33937 | +out_opq: |
c2b27bf2 | 33938 | + if (au_ftest_cpdown(*flags, DIROPQ)) { |
febd17d6 | 33939 | + inode_lock_nested(h_inode, AuLsc_I_CHILD); |
1facf9fc | 33940 | + rerr = au_diropq_remove(dentry, bdst); |
febd17d6 | 33941 | + inode_unlock(h_inode); |
1facf9fc | 33942 | + if (unlikely(rerr)) { |
523b37e3 AM |
33943 | + AuIOErr("failed removing diropq for %pd b%d (%d)\n", |
33944 | + dentry, bdst, rerr); | |
1facf9fc | 33945 | + err = -EIO; |
33946 | + goto out; | |
33947 | + } | |
33948 | + } | |
4f0767ce | 33949 | +out_dir: |
c2b27bf2 | 33950 | + if (au_ftest_cpdown(*flags, MADE_DIR)) { |
1facf9fc | 33951 | + rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path); |
33952 | + if (unlikely(rerr)) { | |
523b37e3 AM |
33953 | + AuIOErr("failed removing %pd b%d (%d)\n", |
33954 | + dentry, bdst, rerr); | |
1facf9fc | 33955 | + err = -EIO; |
33956 | + } | |
33957 | + } | |
4f0767ce | 33958 | +out_put: |
1facf9fc | 33959 | + au_set_h_dptr(dentry, bdst, NULL); |
5afbbe0d AM |
33960 | + if (au_dbbot(dentry) == bdst) |
33961 | + au_update_dbbot(dentry); | |
4f0767ce | 33962 | +out: |
1facf9fc | 33963 | + dput(parent); |
33964 | + return err; | |
33965 | +} | |
33966 | + | |
33967 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
33968 | +{ | |
33969 | + int err; | |
c2b27bf2 | 33970 | + unsigned int flags; |
1facf9fc | 33971 | + |
c2b27bf2 AM |
33972 | + flags = 0; |
33973 | + err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &flags); | |
1facf9fc | 33974 | + |
33975 | + return err; | |
33976 | +} | |
33977 | + | |
33978 | +/* ---------------------------------------------------------------------- */ | |
33979 | + | |
33980 | +/* policies for create */ | |
33981 | + | |
c2b27bf2 | 33982 | +int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex) |
4a4d8108 AM |
33983 | +{ |
33984 | + int err, i, j, ndentry; | |
33985 | + aufs_bindex_t bopq; | |
33986 | + struct au_dcsub_pages dpages; | |
33987 | + struct au_dpage *dpage; | |
33988 | + struct dentry **dentries, *parent, *d; | |
33989 | + | |
33990 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
33991 | + if (unlikely(err)) | |
33992 | + goto out; | |
33993 | + parent = dget_parent(dentry); | |
027c5e7a | 33994 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0); |
4a4d8108 AM |
33995 | + if (unlikely(err)) |
33996 | + goto out_free; | |
33997 | + | |
33998 | + err = bindex; | |
33999 | + for (i = 0; i < dpages.ndpage; i++) { | |
34000 | + dpage = dpages.dpages + i; | |
34001 | + dentries = dpage->dentries; | |
34002 | + ndentry = dpage->ndentry; | |
34003 | + for (j = 0; j < ndentry; j++) { | |
34004 | + d = dentries[j]; | |
34005 | + di_read_lock_parent2(d, !AuLock_IR); | |
34006 | + bopq = au_dbdiropq(d); | |
34007 | + di_read_unlock(d, !AuLock_IR); | |
34008 | + if (bopq >= 0 && bopq < err) | |
34009 | + err = bopq; | |
34010 | + } | |
34011 | + } | |
34012 | + | |
34013 | +out_free: | |
34014 | + dput(parent); | |
34015 | + au_dpages_free(&dpages); | |
34016 | +out: | |
34017 | + return err; | |
34018 | +} | |
34019 | + | |
1facf9fc | 34020 | +static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex) |
34021 | +{ | |
34022 | + for (; bindex >= 0; bindex--) | |
34023 | + if (!au_br_rdonly(au_sbr(sb, bindex))) | |
34024 | + return bindex; | |
34025 | + return -EROFS; | |
34026 | +} | |
34027 | + | |
34028 | +/* top down parent */ | |
392086de AM |
34029 | +static int au_wbr_create_tdp(struct dentry *dentry, |
34030 | + unsigned int flags __maybe_unused) | |
1facf9fc | 34031 | +{ |
34032 | + int err; | |
5afbbe0d | 34033 | + aufs_bindex_t btop, bindex; |
1facf9fc | 34034 | + struct super_block *sb; |
34035 | + struct dentry *parent, *h_parent; | |
34036 | + | |
34037 | + sb = dentry->d_sb; | |
5afbbe0d AM |
34038 | + btop = au_dbtop(dentry); |
34039 | + err = btop; | |
34040 | + if (!au_br_rdonly(au_sbr(sb, btop))) | |
1facf9fc | 34041 | + goto out; |
34042 | + | |
34043 | + err = -EROFS; | |
34044 | + parent = dget_parent(dentry); | |
5afbbe0d | 34045 | + for (bindex = au_dbtop(parent); bindex < btop; bindex++) { |
1facf9fc | 34046 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34047 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34048 | + continue; |
34049 | + | |
34050 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
34051 | + err = bindex; | |
34052 | + break; | |
34053 | + } | |
34054 | + } | |
34055 | + dput(parent); | |
34056 | + | |
34057 | + /* bottom up here */ | |
4a4d8108 | 34058 | + if (unlikely(err < 0)) { |
5afbbe0d | 34059 | + err = au_wbr_bu(sb, btop - 1); |
4a4d8108 AM |
34060 | + if (err >= 0) |
34061 | + err = au_wbr_nonopq(dentry, err); | |
34062 | + } | |
1facf9fc | 34063 | + |
4f0767ce | 34064 | +out: |
1facf9fc | 34065 | + AuDbg("b%d\n", err); |
34066 | + return err; | |
34067 | +} | |
34068 | + | |
34069 | +/* ---------------------------------------------------------------------- */ | |
34070 | + | |
34071 | +/* an exception for the policy other than tdp */ | |
34072 | +static int au_wbr_create_exp(struct dentry *dentry) | |
34073 | +{ | |
34074 | + int err; | |
34075 | + aufs_bindex_t bwh, bdiropq; | |
34076 | + struct dentry *parent; | |
34077 | + | |
34078 | + err = -1; | |
34079 | + bwh = au_dbwh(dentry); | |
34080 | + parent = dget_parent(dentry); | |
34081 | + bdiropq = au_dbdiropq(parent); | |
34082 | + if (bwh >= 0) { | |
34083 | + if (bdiropq >= 0) | |
34084 | + err = min(bdiropq, bwh); | |
34085 | + else | |
34086 | + err = bwh; | |
34087 | + AuDbg("%d\n", err); | |
34088 | + } else if (bdiropq >= 0) { | |
34089 | + err = bdiropq; | |
34090 | + AuDbg("%d\n", err); | |
34091 | + } | |
34092 | + dput(parent); | |
34093 | + | |
4a4d8108 AM |
34094 | + if (err >= 0) |
34095 | + err = au_wbr_nonopq(dentry, err); | |
34096 | + | |
1facf9fc | 34097 | + if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err))) |
34098 | + err = -1; | |
34099 | + | |
34100 | + AuDbg("%d\n", err); | |
34101 | + return err; | |
34102 | +} | |
34103 | + | |
34104 | +/* ---------------------------------------------------------------------- */ | |
34105 | + | |
34106 | +/* round robin */ | |
34107 | +static int au_wbr_create_init_rr(struct super_block *sb) | |
34108 | +{ | |
34109 | + int err; | |
34110 | + | |
5afbbe0d | 34111 | + err = au_wbr_bu(sb, au_sbbot(sb)); |
1facf9fc | 34112 | + atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */ |
dece6358 | 34113 | + /* smp_mb(); */ |
1facf9fc | 34114 | + |
34115 | + AuDbg("b%d\n", err); | |
34116 | + return err; | |
34117 | +} | |
34118 | + | |
392086de | 34119 | +static int au_wbr_create_rr(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34120 | +{ |
34121 | + int err, nbr; | |
34122 | + unsigned int u; | |
5afbbe0d | 34123 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 34124 | + struct super_block *sb; |
34125 | + atomic_t *next; | |
34126 | + | |
34127 | + err = au_wbr_create_exp(dentry); | |
34128 | + if (err >= 0) | |
34129 | + goto out; | |
34130 | + | |
34131 | + sb = dentry->d_sb; | |
34132 | + next = &au_sbi(sb)->si_wbr_rr_next; | |
5afbbe0d AM |
34133 | + bbot = au_sbbot(sb); |
34134 | + nbr = bbot + 1; | |
34135 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
392086de | 34136 | + if (!au_ftest_wbr(flags, DIR)) { |
1facf9fc | 34137 | + err = atomic_dec_return(next) + 1; |
34138 | + /* modulo for 0 is meaningless */ | |
34139 | + if (unlikely(!err)) | |
34140 | + err = atomic_dec_return(next) + 1; | |
34141 | + } else | |
34142 | + err = atomic_read(next); | |
34143 | + AuDbg("%d\n", err); | |
34144 | + u = err; | |
34145 | + err = u % nbr; | |
34146 | + AuDbg("%d\n", err); | |
34147 | + if (!au_br_rdonly(au_sbr(sb, err))) | |
34148 | + break; | |
34149 | + err = -EROFS; | |
34150 | + } | |
34151 | + | |
4a4d8108 AM |
34152 | + if (err >= 0) |
34153 | + err = au_wbr_nonopq(dentry, err); | |
34154 | + | |
4f0767ce | 34155 | +out: |
1facf9fc | 34156 | + AuDbg("%d\n", err); |
34157 | + return err; | |
34158 | +} | |
34159 | + | |
34160 | +/* ---------------------------------------------------------------------- */ | |
34161 | + | |
34162 | +/* most free space */ | |
392086de | 34163 | +static void au_mfs(struct dentry *dentry, struct dentry *parent) |
1facf9fc | 34164 | +{ |
34165 | + struct super_block *sb; | |
34166 | + struct au_branch *br; | |
34167 | + struct au_wbr_mfs *mfs; | |
392086de | 34168 | + struct dentry *h_parent; |
5afbbe0d | 34169 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 34170 | + int err; |
34171 | + unsigned long long b, bavail; | |
7f207e10 | 34172 | + struct path h_path; |
1facf9fc | 34173 | + /* reduce the stack usage */ |
34174 | + struct kstatfs *st; | |
34175 | + | |
34176 | + st = kmalloc(sizeof(*st), GFP_NOFS); | |
34177 | + if (unlikely(!st)) { | |
34178 | + AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM); | |
34179 | + return; | |
34180 | + } | |
34181 | + | |
34182 | + bavail = 0; | |
34183 | + sb = dentry->d_sb; | |
34184 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
dece6358 | 34185 | + MtxMustLock(&mfs->mfs_lock); |
1facf9fc | 34186 | + mfs->mfs_bindex = -EROFS; |
34187 | + mfs->mfsrr_bytes = 0; | |
392086de AM |
34188 | + if (!parent) { |
34189 | + bindex = 0; | |
5afbbe0d | 34190 | + bbot = au_sbbot(sb); |
392086de | 34191 | + } else { |
5afbbe0d AM |
34192 | + bindex = au_dbtop(parent); |
34193 | + bbot = au_dbtaildir(parent); | |
392086de AM |
34194 | + } |
34195 | + | |
5afbbe0d | 34196 | + for (; bindex <= bbot; bindex++) { |
392086de AM |
34197 | + if (parent) { |
34198 | + h_parent = au_h_dptr(parent, bindex); | |
5527c038 | 34199 | + if (!h_parent || d_is_negative(h_parent)) |
392086de AM |
34200 | + continue; |
34201 | + } | |
1facf9fc | 34202 | + br = au_sbr(sb, bindex); |
34203 | + if (au_br_rdonly(br)) | |
34204 | + continue; | |
34205 | + | |
34206 | + /* sb->s_root for NFS is unreliable */ | |
86dc4139 | 34207 | + h_path.mnt = au_br_mnt(br); |
7f207e10 AM |
34208 | + h_path.dentry = h_path.mnt->mnt_root; |
34209 | + err = vfs_statfs(&h_path, st); | |
1facf9fc | 34210 | + if (unlikely(err)) { |
34211 | + AuWarn1("failed statfs, b%d, %d\n", bindex, err); | |
34212 | + continue; | |
34213 | + } | |
34214 | + | |
34215 | + /* when the available size is equal, select the lower one */ | |
34216 | + BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail) | |
34217 | + || sizeof(b) < sizeof(st->f_bsize)); | |
34218 | + b = st->f_bavail * st->f_bsize; | |
34219 | + br->br_wbr->wbr_bytes = b; | |
34220 | + if (b >= bavail) { | |
34221 | + bavail = b; | |
34222 | + mfs->mfs_bindex = bindex; | |
34223 | + mfs->mfs_jiffy = jiffies; | |
34224 | + } | |
34225 | + } | |
34226 | + | |
34227 | + mfs->mfsrr_bytes = bavail; | |
34228 | + AuDbg("b%d\n", mfs->mfs_bindex); | |
1c60b727 | 34229 | + kfree(st); |
1facf9fc | 34230 | +} |
34231 | + | |
392086de | 34232 | +static int au_wbr_create_mfs(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34233 | +{ |
34234 | + int err; | |
392086de | 34235 | + struct dentry *parent; |
1facf9fc | 34236 | + struct super_block *sb; |
34237 | + struct au_wbr_mfs *mfs; | |
34238 | + | |
34239 | + err = au_wbr_create_exp(dentry); | |
34240 | + if (err >= 0) | |
34241 | + goto out; | |
34242 | + | |
34243 | + sb = dentry->d_sb; | |
392086de AM |
34244 | + parent = NULL; |
34245 | + if (au_ftest_wbr(flags, PARENT)) | |
34246 | + parent = dget_parent(dentry); | |
1facf9fc | 34247 | + mfs = &au_sbi(sb)->si_wbr_mfs; |
34248 | + mutex_lock(&mfs->mfs_lock); | |
34249 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
34250 | + || mfs->mfs_bindex < 0 | |
34251 | + || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))) | |
392086de | 34252 | + au_mfs(dentry, parent); |
1facf9fc | 34253 | + mutex_unlock(&mfs->mfs_lock); |
34254 | + err = mfs->mfs_bindex; | |
392086de | 34255 | + dput(parent); |
1facf9fc | 34256 | + |
4a4d8108 AM |
34257 | + if (err >= 0) |
34258 | + err = au_wbr_nonopq(dentry, err); | |
34259 | + | |
4f0767ce | 34260 | +out: |
1facf9fc | 34261 | + AuDbg("b%d\n", err); |
34262 | + return err; | |
34263 | +} | |
34264 | + | |
34265 | +static int au_wbr_create_init_mfs(struct super_block *sb) | |
34266 | +{ | |
34267 | + struct au_wbr_mfs *mfs; | |
34268 | + | |
34269 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34270 | + mutex_init(&mfs->mfs_lock); | |
34271 | + mfs->mfs_jiffy = 0; | |
34272 | + mfs->mfs_bindex = -EROFS; | |
34273 | + | |
34274 | + return 0; | |
34275 | +} | |
34276 | + | |
34277 | +static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused) | |
34278 | +{ | |
34279 | + mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock); | |
34280 | + return 0; | |
34281 | +} | |
34282 | + | |
34283 | +/* ---------------------------------------------------------------------- */ | |
34284 | + | |
f2c43d5f AM |
34285 | +/* top down regardless parent, and then mfs */ |
34286 | +static int au_wbr_create_tdmfs(struct dentry *dentry, | |
34287 | + unsigned int flags __maybe_unused) | |
34288 | +{ | |
34289 | + int err; | |
34290 | + aufs_bindex_t bwh, btail, bindex, bfound, bmfs; | |
34291 | + unsigned long long watermark; | |
34292 | + struct super_block *sb; | |
34293 | + struct au_wbr_mfs *mfs; | |
34294 | + struct au_branch *br; | |
34295 | + struct dentry *parent; | |
34296 | + | |
34297 | + sb = dentry->d_sb; | |
34298 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34299 | + mutex_lock(&mfs->mfs_lock); | |
34300 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
34301 | + || mfs->mfs_bindex < 0) | |
34302 | + au_mfs(dentry, /*parent*/NULL); | |
34303 | + watermark = mfs->mfsrr_watermark; | |
34304 | + bmfs = mfs->mfs_bindex; | |
34305 | + mutex_unlock(&mfs->mfs_lock); | |
34306 | + | |
34307 | + /* another style of au_wbr_create_exp() */ | |
34308 | + bwh = au_dbwh(dentry); | |
34309 | + parent = dget_parent(dentry); | |
34310 | + btail = au_dbtaildir(parent); | |
34311 | + if (bwh >= 0 && bwh < btail) | |
34312 | + btail = bwh; | |
34313 | + | |
34314 | + err = au_wbr_nonopq(dentry, btail); | |
34315 | + if (unlikely(err < 0)) | |
34316 | + goto out; | |
34317 | + btail = err; | |
34318 | + bfound = -1; | |
34319 | + for (bindex = 0; bindex <= btail; bindex++) { | |
34320 | + br = au_sbr(sb, bindex); | |
34321 | + if (au_br_rdonly(br)) | |
34322 | + continue; | |
34323 | + if (br->br_wbr->wbr_bytes > watermark) { | |
34324 | + bfound = bindex; | |
34325 | + break; | |
34326 | + } | |
34327 | + } | |
34328 | + err = bfound; | |
34329 | + if (err < 0) | |
34330 | + err = bmfs; | |
34331 | + | |
34332 | +out: | |
34333 | + dput(parent); | |
34334 | + AuDbg("b%d\n", err); | |
34335 | + return err; | |
34336 | +} | |
34337 | + | |
34338 | +/* ---------------------------------------------------------------------- */ | |
34339 | + | |
1facf9fc | 34340 | +/* most free space and then round robin */ |
392086de | 34341 | +static int au_wbr_create_mfsrr(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34342 | +{ |
34343 | + int err; | |
34344 | + struct au_wbr_mfs *mfs; | |
34345 | + | |
392086de | 34346 | + err = au_wbr_create_mfs(dentry, flags); |
1facf9fc | 34347 | + if (err >= 0) { |
34348 | + mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs; | |
dece6358 | 34349 | + mutex_lock(&mfs->mfs_lock); |
1facf9fc | 34350 | + if (mfs->mfsrr_bytes < mfs->mfsrr_watermark) |
392086de | 34351 | + err = au_wbr_create_rr(dentry, flags); |
dece6358 | 34352 | + mutex_unlock(&mfs->mfs_lock); |
1facf9fc | 34353 | + } |
34354 | + | |
34355 | + AuDbg("b%d\n", err); | |
34356 | + return err; | |
34357 | +} | |
34358 | + | |
34359 | +static int au_wbr_create_init_mfsrr(struct super_block *sb) | |
34360 | +{ | |
34361 | + int err; | |
34362 | + | |
34363 | + au_wbr_create_init_mfs(sb); /* ignore */ | |
34364 | + err = au_wbr_create_init_rr(sb); | |
34365 | + | |
34366 | + return err; | |
34367 | +} | |
34368 | + | |
34369 | +/* ---------------------------------------------------------------------- */ | |
34370 | + | |
34371 | +/* top down parent and most free space */ | |
392086de | 34372 | +static int au_wbr_create_pmfs(struct dentry *dentry, unsigned int flags) |
1facf9fc | 34373 | +{ |
34374 | + int err, e2; | |
34375 | + unsigned long long b; | |
5afbbe0d | 34376 | + aufs_bindex_t bindex, btop, bbot; |
1facf9fc | 34377 | + struct super_block *sb; |
34378 | + struct dentry *parent, *h_parent; | |
34379 | + struct au_branch *br; | |
34380 | + | |
392086de | 34381 | + err = au_wbr_create_tdp(dentry, flags); |
1facf9fc | 34382 | + if (unlikely(err < 0)) |
34383 | + goto out; | |
34384 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
34385 | + btop = au_dbtop(parent); |
34386 | + bbot = au_dbtaildir(parent); | |
34387 | + if (btop == bbot) | |
1facf9fc | 34388 | + goto out_parent; /* success */ |
34389 | + | |
392086de | 34390 | + e2 = au_wbr_create_mfs(dentry, flags); |
1facf9fc | 34391 | + if (e2 < 0) |
34392 | + goto out_parent; /* success */ | |
34393 | + | |
34394 | + /* when the available size is equal, select upper one */ | |
34395 | + sb = dentry->d_sb; | |
34396 | + br = au_sbr(sb, err); | |
34397 | + b = br->br_wbr->wbr_bytes; | |
34398 | + AuDbg("b%d, %llu\n", err, b); | |
34399 | + | |
5afbbe0d | 34400 | + for (bindex = btop; bindex <= bbot; bindex++) { |
1facf9fc | 34401 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34402 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34403 | + continue; |
34404 | + | |
34405 | + br = au_sbr(sb, bindex); | |
34406 | + if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) { | |
34407 | + b = br->br_wbr->wbr_bytes; | |
34408 | + err = bindex; | |
34409 | + AuDbg("b%d, %llu\n", err, b); | |
34410 | + } | |
34411 | + } | |
34412 | + | |
4a4d8108 AM |
34413 | + if (err >= 0) |
34414 | + err = au_wbr_nonopq(dentry, err); | |
34415 | + | |
4f0767ce | 34416 | +out_parent: |
1facf9fc | 34417 | + dput(parent); |
4f0767ce | 34418 | +out: |
1facf9fc | 34419 | + AuDbg("b%d\n", err); |
34420 | + return err; | |
34421 | +} | |
34422 | + | |
34423 | +/* ---------------------------------------------------------------------- */ | |
34424 | + | |
392086de AM |
34425 | +/* |
34426 | + * - top down parent | |
34427 | + * - most free space with parent | |
34428 | + * - most free space round-robin regardless parent | |
34429 | + */ | |
34430 | +static int au_wbr_create_pmfsrr(struct dentry *dentry, unsigned int flags) | |
34431 | +{ | |
34432 | + int err; | |
34433 | + unsigned long long watermark; | |
34434 | + struct super_block *sb; | |
34435 | + struct au_branch *br; | |
34436 | + struct au_wbr_mfs *mfs; | |
34437 | + | |
34438 | + err = au_wbr_create_pmfs(dentry, flags | AuWbr_PARENT); | |
34439 | + if (unlikely(err < 0)) | |
34440 | + goto out; | |
34441 | + | |
34442 | + sb = dentry->d_sb; | |
34443 | + br = au_sbr(sb, err); | |
34444 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
34445 | + mutex_lock(&mfs->mfs_lock); | |
34446 | + watermark = mfs->mfsrr_watermark; | |
34447 | + mutex_unlock(&mfs->mfs_lock); | |
34448 | + if (br->br_wbr->wbr_bytes < watermark) | |
34449 | + /* regardless the parent dir */ | |
34450 | + err = au_wbr_create_mfsrr(dentry, flags); | |
34451 | + | |
34452 | +out: | |
34453 | + AuDbg("b%d\n", err); | |
34454 | + return err; | |
34455 | +} | |
34456 | + | |
34457 | +/* ---------------------------------------------------------------------- */ | |
34458 | + | |
1facf9fc | 34459 | +/* policies for copyup */ |
34460 | + | |
34461 | +/* top down parent */ | |
34462 | +static int au_wbr_copyup_tdp(struct dentry *dentry) | |
34463 | +{ | |
392086de | 34464 | + return au_wbr_create_tdp(dentry, /*flags, anything is ok*/0); |
1facf9fc | 34465 | +} |
34466 | + | |
34467 | +/* bottom up parent */ | |
34468 | +static int au_wbr_copyup_bup(struct dentry *dentry) | |
34469 | +{ | |
34470 | + int err; | |
5afbbe0d | 34471 | + aufs_bindex_t bindex, btop; |
1facf9fc | 34472 | + struct dentry *parent, *h_parent; |
34473 | + struct super_block *sb; | |
34474 | + | |
34475 | + err = -EROFS; | |
34476 | + sb = dentry->d_sb; | |
34477 | + parent = dget_parent(dentry); | |
5afbbe0d AM |
34478 | + btop = au_dbtop(parent); |
34479 | + for (bindex = au_dbtop(dentry); bindex >= btop; bindex--) { | |
1facf9fc | 34480 | + h_parent = au_h_dptr(parent, bindex); |
5527c038 | 34481 | + if (!h_parent || d_is_negative(h_parent)) |
1facf9fc | 34482 | + continue; |
34483 | + | |
34484 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
34485 | + err = bindex; | |
34486 | + break; | |
34487 | + } | |
34488 | + } | |
34489 | + dput(parent); | |
34490 | + | |
34491 | + /* bottom up here */ | |
34492 | + if (unlikely(err < 0)) | |
5afbbe0d | 34493 | + err = au_wbr_bu(sb, btop - 1); |
1facf9fc | 34494 | + |
34495 | + AuDbg("b%d\n", err); | |
34496 | + return err; | |
34497 | +} | |
34498 | + | |
34499 | +/* bottom up */ | |
5afbbe0d | 34500 | +int au_wbr_do_copyup_bu(struct dentry *dentry, aufs_bindex_t btop) |
1facf9fc | 34501 | +{ |
34502 | + int err; | |
34503 | + | |
5afbbe0d | 34504 | + err = au_wbr_bu(dentry->d_sb, btop); |
4a4d8108 | 34505 | + AuDbg("b%d\n", err); |
5afbbe0d | 34506 | + if (err > btop) |
4a4d8108 | 34507 | + err = au_wbr_nonopq(dentry, err); |
1facf9fc | 34508 | + |
34509 | + AuDbg("b%d\n", err); | |
34510 | + return err; | |
34511 | +} | |
34512 | + | |
076b876e AM |
34513 | +static int au_wbr_copyup_bu(struct dentry *dentry) |
34514 | +{ | |
34515 | + int err; | |
5afbbe0d | 34516 | + aufs_bindex_t btop; |
076b876e | 34517 | + |
5afbbe0d AM |
34518 | + btop = au_dbtop(dentry); |
34519 | + err = au_wbr_do_copyup_bu(dentry, btop); | |
076b876e AM |
34520 | + return err; |
34521 | +} | |
34522 | + | |
1facf9fc | 34523 | +/* ---------------------------------------------------------------------- */ |
34524 | + | |
34525 | +struct au_wbr_copyup_operations au_wbr_copyup_ops[] = { | |
34526 | + [AuWbrCopyup_TDP] = { | |
34527 | + .copyup = au_wbr_copyup_tdp | |
34528 | + }, | |
34529 | + [AuWbrCopyup_BUP] = { | |
34530 | + .copyup = au_wbr_copyup_bup | |
34531 | + }, | |
34532 | + [AuWbrCopyup_BU] = { | |
34533 | + .copyup = au_wbr_copyup_bu | |
34534 | + } | |
34535 | +}; | |
34536 | + | |
34537 | +struct au_wbr_create_operations au_wbr_create_ops[] = { | |
34538 | + [AuWbrCreate_TDP] = { | |
34539 | + .create = au_wbr_create_tdp | |
34540 | + }, | |
34541 | + [AuWbrCreate_RR] = { | |
34542 | + .create = au_wbr_create_rr, | |
34543 | + .init = au_wbr_create_init_rr | |
34544 | + }, | |
34545 | + [AuWbrCreate_MFS] = { | |
34546 | + .create = au_wbr_create_mfs, | |
34547 | + .init = au_wbr_create_init_mfs, | |
34548 | + .fin = au_wbr_create_fin_mfs | |
34549 | + }, | |
34550 | + [AuWbrCreate_MFSV] = { | |
34551 | + .create = au_wbr_create_mfs, | |
34552 | + .init = au_wbr_create_init_mfs, | |
34553 | + .fin = au_wbr_create_fin_mfs | |
34554 | + }, | |
34555 | + [AuWbrCreate_MFSRR] = { | |
34556 | + .create = au_wbr_create_mfsrr, | |
34557 | + .init = au_wbr_create_init_mfsrr, | |
34558 | + .fin = au_wbr_create_fin_mfs | |
34559 | + }, | |
34560 | + [AuWbrCreate_MFSRRV] = { | |
34561 | + .create = au_wbr_create_mfsrr, | |
34562 | + .init = au_wbr_create_init_mfsrr, | |
34563 | + .fin = au_wbr_create_fin_mfs | |
34564 | + }, | |
f2c43d5f AM |
34565 | + [AuWbrCreate_TDMFS] = { |
34566 | + .create = au_wbr_create_tdmfs, | |
34567 | + .init = au_wbr_create_init_mfs, | |
34568 | + .fin = au_wbr_create_fin_mfs | |
34569 | + }, | |
34570 | + [AuWbrCreate_TDMFSV] = { | |
34571 | + .create = au_wbr_create_tdmfs, | |
34572 | + .init = au_wbr_create_init_mfs, | |
34573 | + .fin = au_wbr_create_fin_mfs | |
34574 | + }, | |
1facf9fc | 34575 | + [AuWbrCreate_PMFS] = { |
34576 | + .create = au_wbr_create_pmfs, | |
34577 | + .init = au_wbr_create_init_mfs, | |
34578 | + .fin = au_wbr_create_fin_mfs | |
34579 | + }, | |
34580 | + [AuWbrCreate_PMFSV] = { | |
34581 | + .create = au_wbr_create_pmfs, | |
34582 | + .init = au_wbr_create_init_mfs, | |
34583 | + .fin = au_wbr_create_fin_mfs | |
392086de AM |
34584 | + }, |
34585 | + [AuWbrCreate_PMFSRR] = { | |
34586 | + .create = au_wbr_create_pmfsrr, | |
34587 | + .init = au_wbr_create_init_mfsrr, | |
34588 | + .fin = au_wbr_create_fin_mfs | |
34589 | + }, | |
34590 | + [AuWbrCreate_PMFSRRV] = { | |
34591 | + .create = au_wbr_create_pmfsrr, | |
34592 | + .init = au_wbr_create_init_mfsrr, | |
34593 | + .fin = au_wbr_create_fin_mfs | |
1facf9fc | 34594 | + } |
34595 | +}; | |
7f207e10 AM |
34596 | diff -urN /usr/share/empty/fs/aufs/whout.c linux/fs/aufs/whout.c |
34597 | --- /usr/share/empty/fs/aufs/whout.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 34598 | +++ linux/fs/aufs/whout.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 34599 | @@ -0,0 +1,1062 @@ |
cd7a4cd9 | 34600 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 34601 | +/* |
b00004a5 | 34602 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 34603 | + * |
34604 | + * This program, aufs is free software; you can redistribute it and/or modify | |
34605 | + * it under the terms of the GNU General Public License as published by | |
34606 | + * the Free Software Foundation; either version 2 of the License, or | |
34607 | + * (at your option) any later version. | |
dece6358 AM |
34608 | + * |
34609 | + * This program is distributed in the hope that it will be useful, | |
34610 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
34611 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
34612 | + * GNU General Public License for more details. | |
34613 | + * | |
34614 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 34615 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 34616 | + */ |
34617 | + | |
34618 | +/* | |
34619 | + * whiteout for logical deletion and opaque directory | |
34620 | + */ | |
34621 | + | |
1facf9fc | 34622 | +#include "aufs.h" |
34623 | + | |
cd7a4cd9 | 34624 | +#define WH_MASK 0444 |
1facf9fc | 34625 | + |
34626 | +/* | |
34627 | + * If a directory contains this file, then it is opaque. We start with the | |
34628 | + * .wh. flag so that it is blocked by lookup. | |
34629 | + */ | |
0c3ec466 AM |
34630 | +static struct qstr diropq_name = QSTR_INIT(AUFS_WH_DIROPQ, |
34631 | + sizeof(AUFS_WH_DIROPQ) - 1); | |
1facf9fc | 34632 | + |
34633 | +/* | |
34634 | + * generate whiteout name, which is NOT terminated by NULL. | |
34635 | + * @name: original d_name.name | |
34636 | + * @len: original d_name.len | |
34637 | + * @wh: whiteout qstr | |
34638 | + * returns zero when succeeds, otherwise error. | |
34639 | + * succeeded value as wh->name should be freed by kfree(). | |
34640 | + */ | |
34641 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name) | |
34642 | +{ | |
34643 | + char *p; | |
34644 | + | |
34645 | + if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN)) | |
34646 | + return -ENAMETOOLONG; | |
34647 | + | |
34648 | + wh->len = name->len + AUFS_WH_PFX_LEN; | |
34649 | + p = kmalloc(wh->len, GFP_NOFS); | |
34650 | + wh->name = p; | |
34651 | + if (p) { | |
34652 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
34653 | + memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len); | |
34654 | + /* smp_mb(); */ | |
34655 | + return 0; | |
34656 | + } | |
34657 | + return -ENOMEM; | |
34658 | +} | |
34659 | + | |
34660 | +/* ---------------------------------------------------------------------- */ | |
34661 | + | |
34662 | +/* | |
34663 | + * test if the @wh_name exists under @h_parent. | |
34664 | + * @try_sio specifies the necessary of super-io. | |
34665 | + */ | |
076b876e | 34666 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio) |
1facf9fc | 34667 | +{ |
34668 | + int err; | |
34669 | + struct dentry *wh_dentry; | |
1facf9fc | 34670 | + |
1facf9fc | 34671 | + if (!try_sio) |
b4510431 | 34672 | + wh_dentry = vfsub_lkup_one(wh_name, h_parent); |
1facf9fc | 34673 | + else |
076b876e | 34674 | + wh_dentry = au_sio_lkup_one(wh_name, h_parent); |
1facf9fc | 34675 | + err = PTR_ERR(wh_dentry); |
2000de60 JR |
34676 | + if (IS_ERR(wh_dentry)) { |
34677 | + if (err == -ENAMETOOLONG) | |
34678 | + err = 0; | |
1facf9fc | 34679 | + goto out; |
2000de60 | 34680 | + } |
1facf9fc | 34681 | + |
34682 | + err = 0; | |
5527c038 | 34683 | + if (d_is_negative(wh_dentry)) |
1facf9fc | 34684 | + goto out_wh; /* success */ |
34685 | + | |
34686 | + err = 1; | |
7e9cd9fe | 34687 | + if (d_is_reg(wh_dentry)) |
1facf9fc | 34688 | + goto out_wh; /* success */ |
34689 | + | |
34690 | + err = -EIO; | |
523b37e3 | 34691 | + AuIOErr("%pd Invalid whiteout entry type 0%o.\n", |
5527c038 | 34692 | + wh_dentry, d_inode(wh_dentry)->i_mode); |
1facf9fc | 34693 | + |
4f0767ce | 34694 | +out_wh: |
1facf9fc | 34695 | + dput(wh_dentry); |
4f0767ce | 34696 | +out: |
1facf9fc | 34697 | + return err; |
34698 | +} | |
34699 | + | |
34700 | +/* | |
34701 | + * test if the @h_dentry sets opaque or not. | |
34702 | + */ | |
076b876e | 34703 | +int au_diropq_test(struct dentry *h_dentry) |
1facf9fc | 34704 | +{ |
34705 | + int err; | |
34706 | + struct inode *h_dir; | |
34707 | + | |
5527c038 | 34708 | + h_dir = d_inode(h_dentry); |
076b876e | 34709 | + err = au_wh_test(h_dentry, &diropq_name, |
1facf9fc | 34710 | + au_test_h_perm_sio(h_dir, MAY_EXEC)); |
34711 | + return err; | |
34712 | +} | |
34713 | + | |
34714 | +/* | |
34715 | + * returns a negative dentry whose name is unique and temporary. | |
34716 | + */ | |
34717 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
34718 | + struct qstr *prefix) | |
34719 | +{ | |
1facf9fc | 34720 | + struct dentry *dentry; |
34721 | + int i; | |
027c5e7a | 34722 | + char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1], |
4a4d8108 | 34723 | + *name, *p; |
027c5e7a | 34724 | + /* strict atomic_t is unnecessary here */ |
1facf9fc | 34725 | + static unsigned short cnt; |
34726 | + struct qstr qs; | |
34727 | + | |
4a4d8108 AM |
34728 | + BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN); |
34729 | + | |
1facf9fc | 34730 | + name = defname; |
027c5e7a AM |
34731 | + qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1; |
34732 | + if (unlikely(prefix->len > DNAME_INLINE_LEN)) { | |
1facf9fc | 34733 | + dentry = ERR_PTR(-ENAMETOOLONG); |
4a4d8108 | 34734 | + if (unlikely(qs.len > NAME_MAX)) |
1facf9fc | 34735 | + goto out; |
34736 | + dentry = ERR_PTR(-ENOMEM); | |
34737 | + name = kmalloc(qs.len + 1, GFP_NOFS); | |
34738 | + if (unlikely(!name)) | |
34739 | + goto out; | |
34740 | + } | |
34741 | + | |
34742 | + /* doubly whiteout-ed */ | |
34743 | + memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2); | |
34744 | + p = name + AUFS_WH_PFX_LEN * 2; | |
34745 | + memcpy(p, prefix->name, prefix->len); | |
34746 | + p += prefix->len; | |
34747 | + *p++ = '.'; | |
4a4d8108 | 34748 | + AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN); |
1facf9fc | 34749 | + |
34750 | + qs.name = name; | |
34751 | + for (i = 0; i < 3; i++) { | |
b752ccd1 | 34752 | + sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++); |
076b876e | 34753 | + dentry = au_sio_lkup_one(&qs, h_parent); |
5527c038 | 34754 | + if (IS_ERR(dentry) || d_is_negative(dentry)) |
1facf9fc | 34755 | + goto out_name; |
34756 | + dput(dentry); | |
34757 | + } | |
0c3ec466 | 34758 | + /* pr_warn("could not get random name\n"); */ |
1facf9fc | 34759 | + dentry = ERR_PTR(-EEXIST); |
34760 | + AuDbg("%.*s\n", AuLNPair(&qs)); | |
34761 | + BUG(); | |
34762 | + | |
4f0767ce | 34763 | +out_name: |
1facf9fc | 34764 | + if (name != defname) |
1c60b727 | 34765 | + kfree(name); |
4f0767ce | 34766 | +out: |
4a4d8108 | 34767 | + AuTraceErrPtr(dentry); |
1facf9fc | 34768 | + return dentry; |
1facf9fc | 34769 | +} |
34770 | + | |
34771 | +/* | |
34772 | + * rename the @h_dentry on @br to the whiteouted temporary name. | |
34773 | + */ | |
34774 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br) | |
34775 | +{ | |
34776 | + int err; | |
34777 | + struct path h_path = { | |
86dc4139 | 34778 | + .mnt = au_br_mnt(br) |
1facf9fc | 34779 | + }; |
523b37e3 | 34780 | + struct inode *h_dir, *delegated; |
1facf9fc | 34781 | + struct dentry *h_parent; |
34782 | + | |
34783 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ | |
5527c038 | 34784 | + h_dir = d_inode(h_parent); |
1facf9fc | 34785 | + IMustLock(h_dir); |
34786 | + | |
34787 | + h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name); | |
34788 | + err = PTR_ERR(h_path.dentry); | |
34789 | + if (IS_ERR(h_path.dentry)) | |
34790 | + goto out; | |
34791 | + | |
34792 | + /* under the same dir, no need to lock_rename() */ | |
523b37e3 | 34793 | + delegated = NULL; |
f2c43d5f AM |
34794 | + err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path, &delegated, |
34795 | + /*flags*/0); | |
1facf9fc | 34796 | + AuTraceErr(err); |
523b37e3 AM |
34797 | + if (unlikely(err == -EWOULDBLOCK)) { |
34798 | + pr_warn("cannot retry for NFSv4 delegation" | |
34799 | + " for an internal rename\n"); | |
34800 | + iput(delegated); | |
34801 | + } | |
1facf9fc | 34802 | + dput(h_path.dentry); |
34803 | + | |
4f0767ce | 34804 | +out: |
4a4d8108 | 34805 | + AuTraceErr(err); |
1facf9fc | 34806 | + return err; |
34807 | +} | |
34808 | + | |
34809 | +/* ---------------------------------------------------------------------- */ | |
34810 | +/* | |
34811 | + * functions for removing a whiteout | |
34812 | + */ | |
34813 | + | |
34814 | +static int do_unlink_wh(struct inode *h_dir, struct path *h_path) | |
34815 | +{ | |
523b37e3 AM |
34816 | + int err, force; |
34817 | + struct inode *delegated; | |
1facf9fc | 34818 | + |
34819 | + /* | |
34820 | + * forces superio when the dir has a sticky bit. | |
34821 | + * this may be a violation of unix fs semantics. | |
34822 | + */ | |
34823 | + force = (h_dir->i_mode & S_ISVTX) | |
5527c038 | 34824 | + && !uid_eq(current_fsuid(), d_inode(h_path->dentry)->i_uid); |
523b37e3 AM |
34825 | + delegated = NULL; |
34826 | + err = vfsub_unlink(h_dir, h_path, &delegated, force); | |
34827 | + if (unlikely(err == -EWOULDBLOCK)) { | |
34828 | + pr_warn("cannot retry for NFSv4 delegation" | |
34829 | + " for an internal unlink\n"); | |
34830 | + iput(delegated); | |
34831 | + } | |
34832 | + return err; | |
1facf9fc | 34833 | +} |
34834 | + | |
34835 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
34836 | + struct dentry *dentry) | |
34837 | +{ | |
34838 | + int err; | |
34839 | + | |
34840 | + err = do_unlink_wh(h_dir, h_path); | |
34841 | + if (!err && dentry) | |
34842 | + au_set_dbwh(dentry, -1); | |
34843 | + | |
34844 | + return err; | |
34845 | +} | |
34846 | + | |
34847 | +static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh, | |
34848 | + struct au_branch *br) | |
34849 | +{ | |
34850 | + int err; | |
34851 | + struct path h_path = { | |
86dc4139 | 34852 | + .mnt = au_br_mnt(br) |
1facf9fc | 34853 | + }; |
34854 | + | |
34855 | + err = 0; | |
b4510431 | 34856 | + h_path.dentry = vfsub_lkup_one(wh, h_parent); |
1facf9fc | 34857 | + if (IS_ERR(h_path.dentry)) |
34858 | + err = PTR_ERR(h_path.dentry); | |
34859 | + else { | |
5527c038 JR |
34860 | + if (d_is_reg(h_path.dentry)) |
34861 | + err = do_unlink_wh(d_inode(h_parent), &h_path); | |
1facf9fc | 34862 | + dput(h_path.dentry); |
34863 | + } | |
34864 | + | |
34865 | + return err; | |
34866 | +} | |
34867 | + | |
34868 | +/* ---------------------------------------------------------------------- */ | |
34869 | +/* | |
34870 | + * initialize/clean whiteout for a branch | |
34871 | + */ | |
34872 | + | |
34873 | +static void au_wh_clean(struct inode *h_dir, struct path *whpath, | |
34874 | + const int isdir) | |
34875 | +{ | |
34876 | + int err; | |
523b37e3 | 34877 | + struct inode *delegated; |
1facf9fc | 34878 | + |
5527c038 | 34879 | + if (d_is_negative(whpath->dentry)) |
1facf9fc | 34880 | + return; |
34881 | + | |
86dc4139 AM |
34882 | + if (isdir) |
34883 | + err = vfsub_rmdir(h_dir, whpath); | |
523b37e3 AM |
34884 | + else { |
34885 | + delegated = NULL; | |
34886 | + err = vfsub_unlink(h_dir, whpath, &delegated, /*force*/0); | |
34887 | + if (unlikely(err == -EWOULDBLOCK)) { | |
34888 | + pr_warn("cannot retry for NFSv4 delegation" | |
34889 | + " for an internal unlink\n"); | |
34890 | + iput(delegated); | |
34891 | + } | |
34892 | + } | |
1facf9fc | 34893 | + if (unlikely(err)) |
523b37e3 AM |
34894 | + pr_warn("failed removing %pd (%d), ignored.\n", |
34895 | + whpath->dentry, err); | |
1facf9fc | 34896 | +} |
34897 | + | |
34898 | +static int test_linkable(struct dentry *h_root) | |
34899 | +{ | |
5527c038 | 34900 | + struct inode *h_dir = d_inode(h_root); |
1facf9fc | 34901 | + |
34902 | + if (h_dir->i_op->link) | |
34903 | + return 0; | |
34904 | + | |
523b37e3 AM |
34905 | + pr_err("%pd (%s) doesn't support link(2), use noplink and rw+nolwh\n", |
34906 | + h_root, au_sbtype(h_root->d_sb)); | |
1facf9fc | 34907 | + return -ENOSYS; |
34908 | +} | |
34909 | + | |
34910 | +/* todo: should this mkdir be done in /sbin/mount.aufs helper? */ | |
34911 | +static int au_whdir(struct inode *h_dir, struct path *path) | |
34912 | +{ | |
34913 | + int err; | |
34914 | + | |
34915 | + err = -EEXIST; | |
5527c038 | 34916 | + if (d_is_negative(path->dentry)) { |
cd7a4cd9 | 34917 | + int mode = 0700; |
1facf9fc | 34918 | + |
34919 | + if (au_test_nfs(path->dentry->d_sb)) | |
cd7a4cd9 | 34920 | + mode |= 0111; |
86dc4139 | 34921 | + err = vfsub_mkdir(h_dir, path, mode); |
2000de60 | 34922 | + } else if (d_is_dir(path->dentry)) |
1facf9fc | 34923 | + err = 0; |
34924 | + else | |
523b37e3 | 34925 | + pr_err("unknown %pd exists\n", path->dentry); |
1facf9fc | 34926 | + |
34927 | + return err; | |
34928 | +} | |
34929 | + | |
34930 | +struct au_wh_base { | |
34931 | + const struct qstr *name; | |
34932 | + struct dentry *dentry; | |
34933 | +}; | |
34934 | + | |
34935 | +static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[], | |
34936 | + struct path *h_path) | |
34937 | +{ | |
34938 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
34939 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
34940 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
34941 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
34942 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
34943 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
34944 | +} | |
34945 | + | |
34946 | +/* | |
34947 | + * returns tri-state, | |
c1595e42 | 34948 | + * minus: error, caller should print the message |
1facf9fc | 34949 | + * zero: succuess |
c1595e42 | 34950 | + * plus: error, caller should NOT print the message |
1facf9fc | 34951 | + */ |
34952 | +static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr, | |
34953 | + int do_plink, struct au_wh_base base[], | |
34954 | + struct path *h_path) | |
34955 | +{ | |
34956 | + int err; | |
34957 | + struct inode *h_dir; | |
34958 | + | |
5527c038 | 34959 | + h_dir = d_inode(h_root); |
1facf9fc | 34960 | + h_path->dentry = base[AuBrWh_BASE].dentry; |
34961 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
34962 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
34963 | + if (do_plink) { | |
34964 | + err = test_linkable(h_root); | |
34965 | + if (unlikely(err)) { | |
34966 | + err = 1; | |
34967 | + goto out; | |
34968 | + } | |
34969 | + | |
34970 | + err = au_whdir(h_dir, h_path); | |
34971 | + if (unlikely(err)) | |
34972 | + goto out; | |
34973 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
34974 | + } else | |
34975 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
34976 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
34977 | + err = au_whdir(h_dir, h_path); | |
34978 | + if (unlikely(err)) | |
34979 | + goto out; | |
34980 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
34981 | + | |
4f0767ce | 34982 | +out: |
1facf9fc | 34983 | + return err; |
34984 | +} | |
34985 | + | |
34986 | +/* | |
34987 | + * for the moment, aufs supports the branch filesystem which does not support | |
34988 | + * link(2). testing on FAT which does not support i_op->setattr() fully either, | |
34989 | + * copyup failed. finally, such filesystem will not be used as the writable | |
34990 | + * branch. | |
34991 | + * | |
34992 | + * returns tri-state, see above. | |
34993 | + */ | |
34994 | +static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr, | |
34995 | + int do_plink, struct au_wh_base base[], | |
34996 | + struct path *h_path) | |
34997 | +{ | |
34998 | + int err; | |
34999 | + struct inode *h_dir; | |
35000 | + | |
1308ab2a | 35001 | + WbrWhMustWriteLock(wbr); |
35002 | + | |
1facf9fc | 35003 | + err = test_linkable(h_root); |
35004 | + if (unlikely(err)) { | |
35005 | + err = 1; | |
35006 | + goto out; | |
35007 | + } | |
35008 | + | |
35009 | + /* | |
35010 | + * todo: should this create be done in /sbin/mount.aufs helper? | |
35011 | + */ | |
35012 | + err = -EEXIST; | |
5527c038 JR |
35013 | + h_dir = d_inode(h_root); |
35014 | + if (d_is_negative(base[AuBrWh_BASE].dentry)) { | |
86dc4139 AM |
35015 | + h_path->dentry = base[AuBrWh_BASE].dentry; |
35016 | + err = vfsub_create(h_dir, h_path, WH_MASK, /*want_excl*/true); | |
7e9cd9fe | 35017 | + } else if (d_is_reg(base[AuBrWh_BASE].dentry)) |
1facf9fc | 35018 | + err = 0; |
35019 | + else | |
523b37e3 | 35020 | + pr_err("unknown %pd2 exists\n", base[AuBrWh_BASE].dentry); |
1facf9fc | 35021 | + if (unlikely(err)) |
35022 | + goto out; | |
35023 | + | |
35024 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
35025 | + if (do_plink) { | |
35026 | + err = au_whdir(h_dir, h_path); | |
35027 | + if (unlikely(err)) | |
35028 | + goto out; | |
35029 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
35030 | + } else | |
35031 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
35032 | + wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry); | |
35033 | + | |
35034 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
35035 | + err = au_whdir(h_dir, h_path); | |
35036 | + if (unlikely(err)) | |
35037 | + goto out; | |
35038 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
35039 | + | |
4f0767ce | 35040 | +out: |
1facf9fc | 35041 | + return err; |
35042 | +} | |
35043 | + | |
35044 | +/* | |
35045 | + * initialize the whiteout base file/dir for @br. | |
35046 | + */ | |
86dc4139 | 35047 | +int au_wh_init(struct au_branch *br, struct super_block *sb) |
1facf9fc | 35048 | +{ |
35049 | + int err, i; | |
35050 | + const unsigned char do_plink | |
35051 | + = !!au_opt_test(au_mntflags(sb), PLINK); | |
1facf9fc | 35052 | + struct inode *h_dir; |
86dc4139 AM |
35053 | + struct path path = br->br_path; |
35054 | + struct dentry *h_root = path.dentry; | |
1facf9fc | 35055 | + struct au_wbr *wbr = br->br_wbr; |
35056 | + static const struct qstr base_name[] = { | |
0c3ec466 AM |
35057 | + [AuBrWh_BASE] = QSTR_INIT(AUFS_BASE_NAME, |
35058 | + sizeof(AUFS_BASE_NAME) - 1), | |
35059 | + [AuBrWh_PLINK] = QSTR_INIT(AUFS_PLINKDIR_NAME, | |
35060 | + sizeof(AUFS_PLINKDIR_NAME) - 1), | |
35061 | + [AuBrWh_ORPH] = QSTR_INIT(AUFS_ORPHDIR_NAME, | |
35062 | + sizeof(AUFS_ORPHDIR_NAME) - 1) | |
1facf9fc | 35063 | + }; |
35064 | + struct au_wh_base base[] = { | |
35065 | + [AuBrWh_BASE] = { | |
35066 | + .name = base_name + AuBrWh_BASE, | |
35067 | + .dentry = NULL | |
35068 | + }, | |
35069 | + [AuBrWh_PLINK] = { | |
35070 | + .name = base_name + AuBrWh_PLINK, | |
35071 | + .dentry = NULL | |
35072 | + }, | |
35073 | + [AuBrWh_ORPH] = { | |
35074 | + .name = base_name + AuBrWh_ORPH, | |
35075 | + .dentry = NULL | |
35076 | + } | |
35077 | + }; | |
35078 | + | |
1308ab2a | 35079 | + if (wbr) |
35080 | + WbrWhMustWriteLock(wbr); | |
1facf9fc | 35081 | + |
1facf9fc | 35082 | + for (i = 0; i < AuBrWh_Last; i++) { |
35083 | + /* doubly whiteouted */ | |
35084 | + struct dentry *d; | |
35085 | + | |
35086 | + d = au_wh_lkup(h_root, (void *)base[i].name, br); | |
35087 | + err = PTR_ERR(d); | |
35088 | + if (IS_ERR(d)) | |
35089 | + goto out; | |
35090 | + | |
35091 | + base[i].dentry = d; | |
35092 | + AuDebugOn(wbr | |
35093 | + && wbr->wbr_wh[i] | |
35094 | + && wbr->wbr_wh[i] != base[i].dentry); | |
35095 | + } | |
35096 | + | |
35097 | + if (wbr) | |
35098 | + for (i = 0; i < AuBrWh_Last; i++) { | |
35099 | + dput(wbr->wbr_wh[i]); | |
35100 | + wbr->wbr_wh[i] = NULL; | |
35101 | + } | |
35102 | + | |
35103 | + err = 0; | |
1e00d052 | 35104 | + if (!au_br_writable(br->br_perm)) { |
5527c038 | 35105 | + h_dir = d_inode(h_root); |
1facf9fc | 35106 | + au_wh_init_ro(h_dir, base, &path); |
1e00d052 | 35107 | + } else if (!au_br_wh_linkable(br->br_perm)) { |
1facf9fc | 35108 | + err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path); |
35109 | + if (err > 0) | |
35110 | + goto out; | |
35111 | + else if (err) | |
35112 | + goto out_err; | |
1e00d052 | 35113 | + } else { |
1facf9fc | 35114 | + err = au_wh_init_rw(h_root, wbr, do_plink, base, &path); |
35115 | + if (err > 0) | |
35116 | + goto out; | |
35117 | + else if (err) | |
35118 | + goto out_err; | |
1facf9fc | 35119 | + } |
35120 | + goto out; /* success */ | |
35121 | + | |
4f0767ce | 35122 | +out_err: |
523b37e3 AM |
35123 | + pr_err("an error(%d) on the writable branch %pd(%s)\n", |
35124 | + err, h_root, au_sbtype(h_root->d_sb)); | |
4f0767ce | 35125 | +out: |
1facf9fc | 35126 | + for (i = 0; i < AuBrWh_Last; i++) |
35127 | + dput(base[i].dentry); | |
35128 | + return err; | |
35129 | +} | |
35130 | + | |
35131 | +/* ---------------------------------------------------------------------- */ | |
35132 | +/* | |
35133 | + * whiteouts are all hard-linked usually. | |
35134 | + * when its link count reaches a ceiling, we create a new whiteout base | |
35135 | + * asynchronously. | |
35136 | + */ | |
35137 | + | |
35138 | +struct reinit_br_wh { | |
35139 | + struct super_block *sb; | |
35140 | + struct au_branch *br; | |
35141 | +}; | |
35142 | + | |
35143 | +static void reinit_br_wh(void *arg) | |
35144 | +{ | |
35145 | + int err; | |
35146 | + aufs_bindex_t bindex; | |
35147 | + struct path h_path; | |
35148 | + struct reinit_br_wh *a = arg; | |
35149 | + struct au_wbr *wbr; | |
523b37e3 | 35150 | + struct inode *dir, *delegated; |
1facf9fc | 35151 | + struct dentry *h_root; |
35152 | + struct au_hinode *hdir; | |
35153 | + | |
35154 | + err = 0; | |
35155 | + wbr = a->br->br_wbr; | |
35156 | + /* big aufs lock */ | |
35157 | + si_noflush_write_lock(a->sb); | |
35158 | + if (!au_br_writable(a->br->br_perm)) | |
35159 | + goto out; | |
35160 | + bindex = au_br_index(a->sb, a->br->br_id); | |
35161 | + if (unlikely(bindex < 0)) | |
35162 | + goto out; | |
35163 | + | |
1308ab2a | 35164 | + di_read_lock_parent(a->sb->s_root, AuLock_IR); |
5527c038 | 35165 | + dir = d_inode(a->sb->s_root); |
1facf9fc | 35166 | + hdir = au_hi(dir, bindex); |
35167 | + h_root = au_h_dptr(a->sb->s_root, bindex); | |
86dc4139 | 35168 | + AuDebugOn(h_root != au_br_dentry(a->br)); |
1facf9fc | 35169 | + |
5afbbe0d | 35170 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 35171 | + wbr_wh_write_lock(wbr); |
35172 | + err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode, | |
35173 | + h_root, a->br); | |
35174 | + if (!err) { | |
86dc4139 AM |
35175 | + h_path.dentry = wbr->wbr_whbase; |
35176 | + h_path.mnt = au_br_mnt(a->br); | |
523b37e3 AM |
35177 | + delegated = NULL; |
35178 | + err = vfsub_unlink(hdir->hi_inode, &h_path, &delegated, | |
35179 | + /*force*/0); | |
35180 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35181 | + pr_warn("cannot retry for NFSv4 delegation" | |
35182 | + " for an internal unlink\n"); | |
35183 | + iput(delegated); | |
35184 | + } | |
1facf9fc | 35185 | + } else { |
523b37e3 | 35186 | + pr_warn("%pd is moved, ignored\n", wbr->wbr_whbase); |
1facf9fc | 35187 | + err = 0; |
35188 | + } | |
35189 | + dput(wbr->wbr_whbase); | |
35190 | + wbr->wbr_whbase = NULL; | |
35191 | + if (!err) | |
86dc4139 | 35192 | + err = au_wh_init(a->br, a->sb); |
1facf9fc | 35193 | + wbr_wh_write_unlock(wbr); |
5afbbe0d | 35194 | + au_hn_inode_unlock(hdir); |
1308ab2a | 35195 | + di_read_unlock(a->sb->s_root, AuLock_IR); |
076b876e AM |
35196 | + if (!err) |
35197 | + au_fhsm_wrote(a->sb, bindex, /*force*/0); | |
1facf9fc | 35198 | + |
4f0767ce | 35199 | +out: |
1facf9fc | 35200 | + if (wbr) |
35201 | + atomic_dec(&wbr->wbr_wh_running); | |
5afbbe0d | 35202 | + au_br_put(a->br); |
1facf9fc | 35203 | + si_write_unlock(a->sb); |
027c5e7a | 35204 | + au_nwt_done(&au_sbi(a->sb)->si_nowait); |
1c60b727 | 35205 | + kfree(arg); |
1facf9fc | 35206 | + if (unlikely(err)) |
35207 | + AuIOErr("err %d\n", err); | |
35208 | +} | |
35209 | + | |
35210 | +static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br) | |
35211 | +{ | |
35212 | + int do_dec, wkq_err; | |
35213 | + struct reinit_br_wh *arg; | |
35214 | + | |
35215 | + do_dec = 1; | |
35216 | + if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1) | |
35217 | + goto out; | |
35218 | + | |
35219 | + /* ignore ENOMEM */ | |
35220 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
35221 | + if (arg) { | |
35222 | + /* | |
35223 | + * dec(wh_running), kfree(arg) and dec(br_count) | |
35224 | + * in reinit function | |
35225 | + */ | |
35226 | + arg->sb = sb; | |
35227 | + arg->br = br; | |
5afbbe0d | 35228 | + au_br_get(br); |
53392da6 | 35229 | + wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0); |
1facf9fc | 35230 | + if (unlikely(wkq_err)) { |
35231 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
5afbbe0d | 35232 | + au_br_put(br); |
1c60b727 | 35233 | + kfree(arg); |
1facf9fc | 35234 | + } |
35235 | + do_dec = 0; | |
35236 | + } | |
35237 | + | |
4f0767ce | 35238 | +out: |
1facf9fc | 35239 | + if (do_dec) |
35240 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
35241 | +} | |
35242 | + | |
35243 | +/* ---------------------------------------------------------------------- */ | |
35244 | + | |
35245 | +/* | |
35246 | + * create the whiteout @wh. | |
35247 | + */ | |
35248 | +static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex, | |
35249 | + struct dentry *wh) | |
35250 | +{ | |
35251 | + int err; | |
35252 | + struct path h_path = { | |
35253 | + .dentry = wh | |
35254 | + }; | |
35255 | + struct au_branch *br; | |
35256 | + struct au_wbr *wbr; | |
35257 | + struct dentry *h_parent; | |
523b37e3 | 35258 | + struct inode *h_dir, *delegated; |
1facf9fc | 35259 | + |
35260 | + h_parent = wh->d_parent; /* dir inode is locked */ | |
5527c038 | 35261 | + h_dir = d_inode(h_parent); |
1facf9fc | 35262 | + IMustLock(h_dir); |
35263 | + | |
35264 | + br = au_sbr(sb, bindex); | |
86dc4139 | 35265 | + h_path.mnt = au_br_mnt(br); |
1facf9fc | 35266 | + wbr = br->br_wbr; |
35267 | + wbr_wh_read_lock(wbr); | |
35268 | + if (wbr->wbr_whbase) { | |
523b37e3 AM |
35269 | + delegated = NULL; |
35270 | + err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path, &delegated); | |
35271 | + if (unlikely(err == -EWOULDBLOCK)) { | |
35272 | + pr_warn("cannot retry for NFSv4 delegation" | |
35273 | + " for an internal link\n"); | |
35274 | + iput(delegated); | |
35275 | + } | |
1facf9fc | 35276 | + if (!err || err != -EMLINK) |
35277 | + goto out; | |
35278 | + | |
35279 | + /* link count full. re-initialize br_whbase. */ | |
35280 | + kick_reinit_br_wh(sb, br); | |
35281 | + } | |
35282 | + | |
35283 | + /* return this error in this context */ | |
b4510431 | 35284 | + err = vfsub_create(h_dir, &h_path, WH_MASK, /*want_excl*/true); |
076b876e AM |
35285 | + if (!err) |
35286 | + au_fhsm_wrote(sb, bindex, /*force*/0); | |
1facf9fc | 35287 | + |
4f0767ce | 35288 | +out: |
1facf9fc | 35289 | + wbr_wh_read_unlock(wbr); |
35290 | + return err; | |
35291 | +} | |
35292 | + | |
35293 | +/* ---------------------------------------------------------------------- */ | |
35294 | + | |
35295 | +/* | |
35296 | + * create or remove the diropq. | |
35297 | + */ | |
35298 | +static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex, | |
35299 | + unsigned int flags) | |
35300 | +{ | |
35301 | + struct dentry *opq_dentry, *h_dentry; | |
35302 | + struct super_block *sb; | |
35303 | + struct au_branch *br; | |
35304 | + int err; | |
35305 | + | |
35306 | + sb = dentry->d_sb; | |
35307 | + br = au_sbr(sb, bindex); | |
35308 | + h_dentry = au_h_dptr(dentry, bindex); | |
b4510431 | 35309 | + opq_dentry = vfsub_lkup_one(&diropq_name, h_dentry); |
1facf9fc | 35310 | + if (IS_ERR(opq_dentry)) |
35311 | + goto out; | |
35312 | + | |
35313 | + if (au_ftest_diropq(flags, CREATE)) { | |
35314 | + err = link_or_create_wh(sb, bindex, opq_dentry); | |
35315 | + if (!err) { | |
35316 | + au_set_dbdiropq(dentry, bindex); | |
35317 | + goto out; /* success */ | |
35318 | + } | |
35319 | + } else { | |
35320 | + struct path tmp = { | |
35321 | + .dentry = opq_dentry, | |
86dc4139 | 35322 | + .mnt = au_br_mnt(br) |
1facf9fc | 35323 | + }; |
5527c038 | 35324 | + err = do_unlink_wh(au_h_iptr(d_inode(dentry), bindex), &tmp); |
1facf9fc | 35325 | + if (!err) |
35326 | + au_set_dbdiropq(dentry, -1); | |
35327 | + } | |
35328 | + dput(opq_dentry); | |
35329 | + opq_dentry = ERR_PTR(err); | |
35330 | + | |
4f0767ce | 35331 | +out: |
1facf9fc | 35332 | + return opq_dentry; |
35333 | +} | |
35334 | + | |
35335 | +struct do_diropq_args { | |
35336 | + struct dentry **errp; | |
35337 | + struct dentry *dentry; | |
35338 | + aufs_bindex_t bindex; | |
35339 | + unsigned int flags; | |
35340 | +}; | |
35341 | + | |
35342 | +static void call_do_diropq(void *args) | |
35343 | +{ | |
35344 | + struct do_diropq_args *a = args; | |
35345 | + *a->errp = do_diropq(a->dentry, a->bindex, a->flags); | |
35346 | +} | |
35347 | + | |
35348 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
35349 | + unsigned int flags) | |
35350 | +{ | |
35351 | + struct dentry *diropq, *h_dentry; | |
35352 | + | |
35353 | + h_dentry = au_h_dptr(dentry, bindex); | |
5527c038 | 35354 | + if (!au_test_h_perm_sio(d_inode(h_dentry), MAY_EXEC | MAY_WRITE)) |
1facf9fc | 35355 | + diropq = do_diropq(dentry, bindex, flags); |
35356 | + else { | |
35357 | + int wkq_err; | |
35358 | + struct do_diropq_args args = { | |
35359 | + .errp = &diropq, | |
35360 | + .dentry = dentry, | |
35361 | + .bindex = bindex, | |
35362 | + .flags = flags | |
35363 | + }; | |
35364 | + | |
35365 | + wkq_err = au_wkq_wait(call_do_diropq, &args); | |
35366 | + if (unlikely(wkq_err)) | |
35367 | + diropq = ERR_PTR(wkq_err); | |
35368 | + } | |
35369 | + | |
35370 | + return diropq; | |
35371 | +} | |
35372 | + | |
35373 | +/* ---------------------------------------------------------------------- */ | |
35374 | + | |
35375 | +/* | |
35376 | + * lookup whiteout dentry. | |
35377 | + * @h_parent: lower parent dentry which must exist and be locked | |
35378 | + * @base_name: name of dentry which will be whiteouted | |
35379 | + * returns dentry for whiteout. | |
35380 | + */ | |
35381 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
35382 | + struct au_branch *br) | |
35383 | +{ | |
35384 | + int err; | |
35385 | + struct qstr wh_name; | |
35386 | + struct dentry *wh_dentry; | |
35387 | + | |
35388 | + err = au_wh_name_alloc(&wh_name, base_name); | |
35389 | + wh_dentry = ERR_PTR(err); | |
35390 | + if (!err) { | |
b4510431 | 35391 | + wh_dentry = vfsub_lkup_one(&wh_name, h_parent); |
1c60b727 | 35392 | + kfree(wh_name.name); |
1facf9fc | 35393 | + } |
35394 | + return wh_dentry; | |
35395 | +} | |
35396 | + | |
35397 | +/* | |
35398 | + * link/create a whiteout for @dentry on @bindex. | |
35399 | + */ | |
35400 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
35401 | + struct dentry *h_parent) | |
35402 | +{ | |
35403 | + struct dentry *wh_dentry; | |
35404 | + struct super_block *sb; | |
35405 | + int err; | |
35406 | + | |
35407 | + sb = dentry->d_sb; | |
35408 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex)); | |
5527c038 | 35409 | + if (!IS_ERR(wh_dentry) && d_is_negative(wh_dentry)) { |
1facf9fc | 35410 | + err = link_or_create_wh(sb, bindex, wh_dentry); |
076b876e | 35411 | + if (!err) { |
1facf9fc | 35412 | + au_set_dbwh(dentry, bindex); |
076b876e AM |
35413 | + au_fhsm_wrote(sb, bindex, /*force*/0); |
35414 | + } else { | |
1facf9fc | 35415 | + dput(wh_dentry); |
35416 | + wh_dentry = ERR_PTR(err); | |
35417 | + } | |
35418 | + } | |
35419 | + | |
35420 | + return wh_dentry; | |
35421 | +} | |
35422 | + | |
35423 | +/* ---------------------------------------------------------------------- */ | |
35424 | + | |
35425 | +/* Delete all whiteouts in this directory on branch bindex. */ | |
35426 | +static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist, | |
35427 | + aufs_bindex_t bindex, struct au_branch *br) | |
35428 | +{ | |
35429 | + int err; | |
35430 | + unsigned long ul, n; | |
35431 | + struct qstr wh_name; | |
35432 | + char *p; | |
35433 | + struct hlist_head *head; | |
c06a8ce3 | 35434 | + struct au_vdir_wh *pos; |
1facf9fc | 35435 | + struct au_vdir_destr *str; |
35436 | + | |
35437 | + err = -ENOMEM; | |
537831f9 | 35438 | + p = (void *)__get_free_page(GFP_NOFS); |
1facf9fc | 35439 | + wh_name.name = p; |
35440 | + if (unlikely(!wh_name.name)) | |
35441 | + goto out; | |
35442 | + | |
35443 | + err = 0; | |
35444 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
35445 | + p += AUFS_WH_PFX_LEN; | |
35446 | + n = whlist->nh_num; | |
35447 | + head = whlist->nh_head; | |
35448 | + for (ul = 0; !err && ul < n; ul++, head++) { | |
c06a8ce3 AM |
35449 | + hlist_for_each_entry(pos, head, wh_hash) { |
35450 | + if (pos->wh_bindex != bindex) | |
1facf9fc | 35451 | + continue; |
35452 | + | |
c06a8ce3 | 35453 | + str = &pos->wh_str; |
1facf9fc | 35454 | + if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) { |
35455 | + memcpy(p, str->name, str->len); | |
35456 | + wh_name.len = AUFS_WH_PFX_LEN + str->len; | |
35457 | + err = unlink_wh_name(h_dentry, &wh_name, br); | |
35458 | + if (!err) | |
35459 | + continue; | |
35460 | + break; | |
35461 | + } | |
35462 | + AuIOErr("whiteout name too long %.*s\n", | |
35463 | + str->len, str->name); | |
35464 | + err = -EIO; | |
35465 | + break; | |
35466 | + } | |
35467 | + } | |
1c60b727 | 35468 | + free_page((unsigned long)wh_name.name); |
1facf9fc | 35469 | + |
4f0767ce | 35470 | +out: |
1facf9fc | 35471 | + return err; |
35472 | +} | |
35473 | + | |
35474 | +struct del_wh_children_args { | |
35475 | + int *errp; | |
35476 | + struct dentry *h_dentry; | |
1308ab2a | 35477 | + struct au_nhash *whlist; |
1facf9fc | 35478 | + aufs_bindex_t bindex; |
35479 | + struct au_branch *br; | |
35480 | +}; | |
35481 | + | |
35482 | +static void call_del_wh_children(void *args) | |
35483 | +{ | |
35484 | + struct del_wh_children_args *a = args; | |
1308ab2a | 35485 | + *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br); |
1facf9fc | 35486 | +} |
35487 | + | |
35488 | +/* ---------------------------------------------------------------------- */ | |
35489 | + | |
35490 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp) | |
35491 | +{ | |
35492 | + struct au_whtmp_rmdir *whtmp; | |
dece6358 | 35493 | + int err; |
1308ab2a | 35494 | + unsigned int rdhash; |
dece6358 AM |
35495 | + |
35496 | + SiMustAnyLock(sb); | |
1facf9fc | 35497 | + |
be52b249 | 35498 | + whtmp = kzalloc(sizeof(*whtmp), gfp); |
dece6358 AM |
35499 | + if (unlikely(!whtmp)) { |
35500 | + whtmp = ERR_PTR(-ENOMEM); | |
1facf9fc | 35501 | + goto out; |
dece6358 | 35502 | + } |
1facf9fc | 35503 | + |
1308ab2a | 35504 | + /* no estimation for dir size */ |
35505 | + rdhash = au_sbi(sb)->si_rdhash; | |
35506 | + if (!rdhash) | |
35507 | + rdhash = AUFS_RDHASH_DEF; | |
35508 | + err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp); | |
35509 | + if (unlikely(err)) { | |
1c60b727 | 35510 | + kfree(whtmp); |
1308ab2a | 35511 | + whtmp = ERR_PTR(err); |
35512 | + } | |
dece6358 | 35513 | + |
4f0767ce | 35514 | +out: |
dece6358 | 35515 | + return whtmp; |
1facf9fc | 35516 | +} |
35517 | + | |
35518 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp) | |
35519 | +{ | |
027c5e7a | 35520 | + if (whtmp->br) |
5afbbe0d | 35521 | + au_br_put(whtmp->br); |
1facf9fc | 35522 | + dput(whtmp->wh_dentry); |
35523 | + iput(whtmp->dir); | |
dece6358 | 35524 | + au_nhash_wh_free(&whtmp->whlist); |
1c60b727 | 35525 | + kfree(whtmp); |
1facf9fc | 35526 | +} |
35527 | + | |
35528 | +/* | |
35529 | + * rmdir the whiteouted temporary named dir @h_dentry. | |
35530 | + * @whlist: whiteouted children. | |
35531 | + */ | |
35532 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35533 | + struct dentry *wh_dentry, struct au_nhash *whlist) | |
35534 | +{ | |
35535 | + int err; | |
2000de60 | 35536 | + unsigned int h_nlink; |
1facf9fc | 35537 | + struct path h_tmp; |
35538 | + struct inode *wh_inode, *h_dir; | |
35539 | + struct au_branch *br; | |
35540 | + | |
5527c038 | 35541 | + h_dir = d_inode(wh_dentry->d_parent); /* dir inode is locked */ |
1facf9fc | 35542 | + IMustLock(h_dir); |
35543 | + | |
35544 | + br = au_sbr(dir->i_sb, bindex); | |
5527c038 | 35545 | + wh_inode = d_inode(wh_dentry); |
febd17d6 | 35546 | + inode_lock_nested(wh_inode, AuLsc_I_CHILD); |
1facf9fc | 35547 | + |
35548 | + /* | |
35549 | + * someone else might change some whiteouts while we were sleeping. | |
35550 | + * it means this whlist may have an obsoleted entry. | |
35551 | + */ | |
35552 | + if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE)) | |
35553 | + err = del_wh_children(wh_dentry, whlist, bindex, br); | |
35554 | + else { | |
35555 | + int wkq_err; | |
35556 | + struct del_wh_children_args args = { | |
35557 | + .errp = &err, | |
35558 | + .h_dentry = wh_dentry, | |
1308ab2a | 35559 | + .whlist = whlist, |
1facf9fc | 35560 | + .bindex = bindex, |
35561 | + .br = br | |
35562 | + }; | |
35563 | + | |
35564 | + wkq_err = au_wkq_wait(call_del_wh_children, &args); | |
35565 | + if (unlikely(wkq_err)) | |
35566 | + err = wkq_err; | |
35567 | + } | |
febd17d6 | 35568 | + inode_unlock(wh_inode); |
1facf9fc | 35569 | + |
35570 | + if (!err) { | |
35571 | + h_tmp.dentry = wh_dentry; | |
86dc4139 | 35572 | + h_tmp.mnt = au_br_mnt(br); |
2000de60 | 35573 | + h_nlink = h_dir->i_nlink; |
1facf9fc | 35574 | + err = vfsub_rmdir(h_dir, &h_tmp); |
2000de60 JR |
35575 | + /* some fs doesn't change the parent nlink in some cases */ |
35576 | + h_nlink -= h_dir->i_nlink; | |
1facf9fc | 35577 | + } |
35578 | + | |
35579 | + if (!err) { | |
5afbbe0d | 35580 | + if (au_ibtop(dir) == bindex) { |
7f207e10 | 35581 | + /* todo: dir->i_mutex is necessary */ |
1facf9fc | 35582 | + au_cpup_attr_timesizes(dir); |
2000de60 JR |
35583 | + if (h_nlink) |
35584 | + vfsub_drop_nlink(dir); | |
1facf9fc | 35585 | + } |
35586 | + return 0; /* success */ | |
35587 | + } | |
35588 | + | |
523b37e3 | 35589 | + pr_warn("failed removing %pd(%d), ignored\n", wh_dentry, err); |
1facf9fc | 35590 | + return err; |
35591 | +} | |
35592 | + | |
35593 | +static void call_rmdir_whtmp(void *args) | |
35594 | +{ | |
35595 | + int err; | |
e49829fe | 35596 | + aufs_bindex_t bindex; |
1facf9fc | 35597 | + struct au_whtmp_rmdir *a = args; |
35598 | + struct super_block *sb; | |
35599 | + struct dentry *h_parent; | |
35600 | + struct inode *h_dir; | |
1facf9fc | 35601 | + struct au_hinode *hdir; |
35602 | + | |
35603 | + /* rmdir by nfsd may cause deadlock with this i_mutex */ | |
febd17d6 | 35604 | + /* inode_lock(a->dir); */ |
e49829fe | 35605 | + err = -EROFS; |
1facf9fc | 35606 | + sb = a->dir->i_sb; |
e49829fe JR |
35607 | + si_read_lock(sb, !AuLock_FLUSH); |
35608 | + if (!au_br_writable(a->br->br_perm)) | |
35609 | + goto out; | |
35610 | + bindex = au_br_index(sb, a->br->br_id); | |
35611 | + if (unlikely(bindex < 0)) | |
1facf9fc | 35612 | + goto out; |
35613 | + | |
35614 | + err = -EIO; | |
1facf9fc | 35615 | + ii_write_lock_parent(a->dir); |
35616 | + h_parent = dget_parent(a->wh_dentry); | |
5527c038 | 35617 | + h_dir = d_inode(h_parent); |
e49829fe | 35618 | + hdir = au_hi(a->dir, bindex); |
86dc4139 AM |
35619 | + err = vfsub_mnt_want_write(au_br_mnt(a->br)); |
35620 | + if (unlikely(err)) | |
35621 | + goto out_mnt; | |
5afbbe0d | 35622 | + au_hn_inode_lock_nested(hdir, AuLsc_I_PARENT); |
e49829fe JR |
35623 | + err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, |
35624 | + a->br); | |
86dc4139 AM |
35625 | + if (!err) |
35626 | + err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, &a->whlist); | |
5afbbe0d | 35627 | + au_hn_inode_unlock(hdir); |
86dc4139 AM |
35628 | + vfsub_mnt_drop_write(au_br_mnt(a->br)); |
35629 | + | |
35630 | +out_mnt: | |
1facf9fc | 35631 | + dput(h_parent); |
35632 | + ii_write_unlock(a->dir); | |
4f0767ce | 35633 | +out: |
febd17d6 | 35634 | + /* inode_unlock(a->dir); */ |
1facf9fc | 35635 | + au_whtmp_rmdir_free(a); |
027c5e7a AM |
35636 | + si_read_unlock(sb); |
35637 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
1facf9fc | 35638 | + if (unlikely(err)) |
35639 | + AuIOErr("err %d\n", err); | |
35640 | +} | |
35641 | + | |
35642 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35643 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args) | |
35644 | +{ | |
35645 | + int wkq_err; | |
e49829fe | 35646 | + struct super_block *sb; |
1facf9fc | 35647 | + |
35648 | + IMustLock(dir); | |
35649 | + | |
35650 | + /* all post-process will be done in do_rmdir_whtmp(). */ | |
e49829fe | 35651 | + sb = dir->i_sb; |
1facf9fc | 35652 | + args->dir = au_igrab(dir); |
e49829fe | 35653 | + args->br = au_sbr(sb, bindex); |
5afbbe0d | 35654 | + au_br_get(args->br); |
1facf9fc | 35655 | + args->wh_dentry = dget(wh_dentry); |
53392da6 | 35656 | + wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0); |
1facf9fc | 35657 | + if (unlikely(wkq_err)) { |
523b37e3 | 35658 | + pr_warn("rmdir error %pd (%d), ignored\n", wh_dentry, wkq_err); |
1facf9fc | 35659 | + au_whtmp_rmdir_free(args); |
35660 | + } | |
35661 | +} | |
7f207e10 AM |
35662 | diff -urN /usr/share/empty/fs/aufs/whout.h linux/fs/aufs/whout.h |
35663 | --- /usr/share/empty/fs/aufs/whout.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 35664 | +++ linux/fs/aufs/whout.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
35665 | @@ -0,0 +1,86 @@ |
35666 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 35667 | +/* |
b00004a5 | 35668 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 35669 | + * |
35670 | + * This program, aufs is free software; you can redistribute it and/or modify | |
35671 | + * it under the terms of the GNU General Public License as published by | |
35672 | + * the Free Software Foundation; either version 2 of the License, or | |
35673 | + * (at your option) any later version. | |
dece6358 AM |
35674 | + * |
35675 | + * This program is distributed in the hope that it will be useful, | |
35676 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
35677 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
35678 | + * GNU General Public License for more details. | |
35679 | + * | |
35680 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 35681 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 35682 | + */ |
35683 | + | |
35684 | +/* | |
35685 | + * whiteout for logical deletion and opaque directory | |
35686 | + */ | |
35687 | + | |
35688 | +#ifndef __AUFS_WHOUT_H__ | |
35689 | +#define __AUFS_WHOUT_H__ | |
35690 | + | |
35691 | +#ifdef __KERNEL__ | |
35692 | + | |
1facf9fc | 35693 | +#include "dir.h" |
35694 | + | |
35695 | +/* whout.c */ | |
35696 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); | |
076b876e AM |
35697 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, int try_sio); |
35698 | +int au_diropq_test(struct dentry *h_dentry); | |
3c1bdaff | 35699 | +struct au_branch; |
1facf9fc | 35700 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, |
35701 | + struct qstr *prefix); | |
35702 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); | |
35703 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
35704 | + struct dentry *dentry); | |
86dc4139 | 35705 | +int au_wh_init(struct au_branch *br, struct super_block *sb); |
1facf9fc | 35706 | + |
35707 | +/* diropq flags */ | |
35708 | +#define AuDiropq_CREATE 1 | |
35709 | +#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) | |
7f207e10 AM |
35710 | +#define au_fset_diropq(flags, name) \ |
35711 | + do { (flags) |= AuDiropq_##name; } while (0) | |
35712 | +#define au_fclr_diropq(flags, name) \ | |
35713 | + do { (flags) &= ~AuDiropq_##name; } while (0) | |
1facf9fc | 35714 | + |
35715 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
35716 | + unsigned int flags); | |
35717 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
35718 | + struct au_branch *br); | |
35719 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
35720 | + struct dentry *h_parent); | |
35721 | + | |
35722 | +/* real rmdir for the whiteout-ed dir */ | |
35723 | +struct au_whtmp_rmdir { | |
35724 | + struct inode *dir; | |
e49829fe | 35725 | + struct au_branch *br; |
1facf9fc | 35726 | + struct dentry *wh_dentry; |
dece6358 | 35727 | + struct au_nhash whlist; |
1facf9fc | 35728 | +}; |
35729 | + | |
35730 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); | |
35731 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); | |
35732 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35733 | + struct dentry *wh_dentry, struct au_nhash *whlist); | |
35734 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
35735 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args); | |
35736 | + | |
35737 | +/* ---------------------------------------------------------------------- */ | |
35738 | + | |
35739 | +static inline struct dentry *au_diropq_create(struct dentry *dentry, | |
35740 | + aufs_bindex_t bindex) | |
35741 | +{ | |
35742 | + return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); | |
35743 | +} | |
35744 | + | |
35745 | +static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) | |
35746 | +{ | |
35747 | + return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); | |
35748 | +} | |
35749 | + | |
35750 | +#endif /* __KERNEL__ */ | |
35751 | +#endif /* __AUFS_WHOUT_H__ */ | |
7f207e10 AM |
35752 | diff -urN /usr/share/empty/fs/aufs/wkq.c linux/fs/aufs/wkq.c |
35753 | --- /usr/share/empty/fs/aufs/wkq.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 35754 | +++ linux/fs/aufs/wkq.c 2018-08-12 23:43:05.463458173 +0200 |
062440b3 | 35755 | @@ -0,0 +1,391 @@ |
cd7a4cd9 | 35756 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 35757 | +/* |
b00004a5 | 35758 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 35759 | + * |
35760 | + * This program, aufs is free software; you can redistribute it and/or modify | |
35761 | + * it under the terms of the GNU General Public License as published by | |
35762 | + * the Free Software Foundation; either version 2 of the License, or | |
35763 | + * (at your option) any later version. | |
dece6358 AM |
35764 | + * |
35765 | + * This program is distributed in the hope that it will be useful, | |
35766 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
35767 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
35768 | + * GNU General Public License for more details. | |
35769 | + * | |
35770 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 35771 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 35772 | + */ |
35773 | + | |
35774 | +/* | |
35775 | + * workqueue for asynchronous/super-io operations | |
35776 | + * todo: try new dredential scheme | |
35777 | + */ | |
35778 | + | |
dece6358 | 35779 | +#include <linux/module.h> |
1facf9fc | 35780 | +#include "aufs.h" |
35781 | + | |
9dbd164d | 35782 | +/* internal workqueue named AUFS_WKQ_NAME */ |
b752ccd1 | 35783 | + |
9dbd164d | 35784 | +static struct workqueue_struct *au_wkq; |
1facf9fc | 35785 | + |
35786 | +struct au_wkinfo { | |
35787 | + struct work_struct wk; | |
7f207e10 | 35788 | + struct kobject *kobj; |
1facf9fc | 35789 | + |
35790 | + unsigned int flags; /* see wkq.h */ | |
35791 | + | |
35792 | + au_wkq_func_t func; | |
35793 | + void *args; | |
35794 | + | |
8b6a4947 AM |
35795 | +#ifdef CONFIG_LOCKDEP |
35796 | + int dont_check; | |
35797 | + struct held_lock **hlock; | |
35798 | +#endif | |
35799 | + | |
1facf9fc | 35800 | + struct completion *comp; |
35801 | +}; | |
35802 | + | |
35803 | +/* ---------------------------------------------------------------------- */ | |
8b6a4947 AM |
35804 | +/* |
35805 | + * Aufs passes some operations to the workqueue such as the internal copyup. | |
35806 | + * This scheme looks rather unnatural for LOCKDEP debugging feature, since the | |
35807 | + * job run by workqueue depends upon the locks acquired in the other task. | |
35808 | + * Delegating a small operation to the workqueue, aufs passes its lockdep | |
35809 | + * information too. And the job in the workqueue restores the info in order to | |
35810 | + * pretend as if it acquired those locks. This is just to make LOCKDEP work | |
35811 | + * correctly and expectedly. | |
35812 | + */ | |
35813 | + | |
35814 | +#ifndef CONFIG_LOCKDEP | |
35815 | +AuStubInt0(au_wkq_lockdep_alloc, struct au_wkinfo *wkinfo); | |
35816 | +AuStubVoid(au_wkq_lockdep_free, struct au_wkinfo *wkinfo); | |
35817 | +AuStubVoid(au_wkq_lockdep_pre, struct au_wkinfo *wkinfo); | |
35818 | +AuStubVoid(au_wkq_lockdep_post, struct au_wkinfo *wkinfo); | |
35819 | +AuStubVoid(au_wkq_lockdep_init, struct au_wkinfo *wkinfo); | |
35820 | +#else | |
35821 | +static void au_wkq_lockdep_init(struct au_wkinfo *wkinfo) | |
35822 | +{ | |
35823 | + wkinfo->hlock = NULL; | |
35824 | + wkinfo->dont_check = 0; | |
35825 | +} | |
35826 | + | |
35827 | +/* | |
35828 | + * 1: matched | |
35829 | + * 0: unmatched | |
35830 | + */ | |
35831 | +static int au_wkq_lockdep_test(struct lock_class_key *key, const char *name) | |
35832 | +{ | |
35833 | + static DEFINE_SPINLOCK(spin); | |
35834 | + static struct { | |
35835 | + char *name; | |
35836 | + struct lock_class_key *key; | |
35837 | + } a[] = { | |
35838 | + { .name = "&sbinfo->si_rwsem" }, | |
35839 | + { .name = "&finfo->fi_rwsem" }, | |
35840 | + { .name = "&dinfo->di_rwsem" }, | |
35841 | + { .name = "&iinfo->ii_rwsem" } | |
35842 | + }; | |
35843 | + static int set; | |
35844 | + int i; | |
35845 | + | |
35846 | + /* lockless read from 'set.' see below */ | |
35847 | + if (set == ARRAY_SIZE(a)) { | |
35848 | + for (i = 0; i < ARRAY_SIZE(a); i++) | |
35849 | + if (a[i].key == key) | |
35850 | + goto match; | |
35851 | + goto unmatch; | |
35852 | + } | |
35853 | + | |
35854 | + spin_lock(&spin); | |
35855 | + if (set) | |
35856 | + for (i = 0; i < ARRAY_SIZE(a); i++) | |
35857 | + if (a[i].key == key) { | |
35858 | + spin_unlock(&spin); | |
35859 | + goto match; | |
35860 | + } | |
35861 | + for (i = 0; i < ARRAY_SIZE(a); i++) { | |
35862 | + if (a[i].key) { | |
35863 | + if (unlikely(a[i].key == key)) { /* rare but possible */ | |
35864 | + spin_unlock(&spin); | |
35865 | + goto match; | |
35866 | + } else | |
35867 | + continue; | |
35868 | + } | |
35869 | + if (strstr(a[i].name, name)) { | |
35870 | + /* | |
35871 | + * the order of these three lines is important for the | |
35872 | + * lockless read above. | |
35873 | + */ | |
35874 | + a[i].key = key; | |
35875 | + spin_unlock(&spin); | |
35876 | + set++; | |
35877 | + /* AuDbg("%d, %s\n", set, name); */ | |
35878 | + goto match; | |
35879 | + } | |
35880 | + } | |
35881 | + spin_unlock(&spin); | |
35882 | + goto unmatch; | |
35883 | + | |
35884 | +match: | |
35885 | + return 1; | |
35886 | +unmatch: | |
35887 | + return 0; | |
35888 | +} | |
35889 | + | |
35890 | +static int au_wkq_lockdep_alloc(struct au_wkinfo *wkinfo) | |
35891 | +{ | |
35892 | + int err, n; | |
35893 | + struct task_struct *curr; | |
35894 | + struct held_lock **hl, *held_locks, *p; | |
35895 | + | |
35896 | + err = 0; | |
35897 | + curr = current; | |
35898 | + wkinfo->dont_check = lockdep_recursing(curr); | |
35899 | + if (wkinfo->dont_check) | |
35900 | + goto out; | |
35901 | + n = curr->lockdep_depth; | |
35902 | + if (!n) | |
35903 | + goto out; | |
35904 | + | |
35905 | + err = -ENOMEM; | |
35906 | + wkinfo->hlock = kmalloc_array(n + 1, sizeof(*wkinfo->hlock), GFP_NOFS); | |
35907 | + if (unlikely(!wkinfo->hlock)) | |
35908 | + goto out; | |
35909 | + | |
35910 | + err = 0; | |
35911 | +#if 0 | |
35912 | + if (0 && au_debug_test()) /* left for debugging */ | |
35913 | + lockdep_print_held_locks(curr); | |
35914 | +#endif | |
35915 | + held_locks = curr->held_locks; | |
35916 | + hl = wkinfo->hlock; | |
35917 | + while (n--) { | |
35918 | + p = held_locks++; | |
35919 | + if (au_wkq_lockdep_test(p->instance->key, p->instance->name)) | |
35920 | + *hl++ = p; | |
35921 | + } | |
35922 | + *hl = NULL; | |
35923 | + | |
35924 | +out: | |
35925 | + return err; | |
35926 | +} | |
35927 | + | |
35928 | +static void au_wkq_lockdep_free(struct au_wkinfo *wkinfo) | |
35929 | +{ | |
35930 | + kfree(wkinfo->hlock); | |
35931 | +} | |
35932 | + | |
35933 | +static void au_wkq_lockdep_pre(struct au_wkinfo *wkinfo) | |
35934 | +{ | |
35935 | + struct held_lock *p, **hl = wkinfo->hlock; | |
35936 | + int subclass; | |
35937 | + | |
35938 | + if (wkinfo->dont_check) | |
35939 | + lockdep_off(); | |
35940 | + if (!hl) | |
35941 | + return; | |
35942 | + while ((p = *hl++)) { /* assignment */ | |
35943 | + subclass = lockdep_hlock_class(p)->subclass; | |
35944 | + /* AuDbg("%s, %d\n", p->instance->name, subclass); */ | |
35945 | + if (p->read) | |
35946 | + rwsem_acquire_read(p->instance, subclass, 0, | |
35947 | + /*p->acquire_ip*/_RET_IP_); | |
35948 | + else | |
35949 | + rwsem_acquire(p->instance, subclass, 0, | |
35950 | + /*p->acquire_ip*/_RET_IP_); | |
35951 | + } | |
35952 | +} | |
35953 | + | |
35954 | +static void au_wkq_lockdep_post(struct au_wkinfo *wkinfo) | |
35955 | +{ | |
35956 | + struct held_lock *p, **hl = wkinfo->hlock; | |
35957 | + | |
35958 | + if (wkinfo->dont_check) | |
35959 | + lockdep_on(); | |
35960 | + if (!hl) | |
35961 | + return; | |
35962 | + while ((p = *hl++)) /* assignment */ | |
35963 | + rwsem_release(p->instance, 0, /*p->acquire_ip*/_RET_IP_); | |
35964 | +} | |
35965 | +#endif | |
1facf9fc | 35966 | + |
1facf9fc | 35967 | +static void wkq_func(struct work_struct *wk) |
35968 | +{ | |
35969 | + struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk); | |
35970 | + | |
2dfbb274 | 35971 | + AuDebugOn(!uid_eq(current_fsuid(), GLOBAL_ROOT_UID)); |
7f207e10 AM |
35972 | + AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY); |
35973 | + | |
8b6a4947 | 35974 | + au_wkq_lockdep_pre(wkinfo); |
1facf9fc | 35975 | + wkinfo->func(wkinfo->args); |
8b6a4947 | 35976 | + au_wkq_lockdep_post(wkinfo); |
1facf9fc | 35977 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) |
35978 | + complete(wkinfo->comp); | |
35979 | + else { | |
7f207e10 | 35980 | + kobject_put(wkinfo->kobj); |
9dbd164d | 35981 | + module_put(THIS_MODULE); /* todo: ?? */ |
1c60b727 | 35982 | + kfree(wkinfo); |
1facf9fc | 35983 | + } |
35984 | +} | |
35985 | + | |
35986 | +/* | |
35987 | + * Since struct completion is large, try allocating it dynamically. | |
35988 | + */ | |
c2b27bf2 | 35989 | +#if 1 /* defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) */ |
1facf9fc | 35990 | +#define AuWkqCompDeclare(name) struct completion *comp = NULL |
35991 | + | |
35992 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
35993 | +{ | |
35994 | + *comp = kmalloc(sizeof(**comp), GFP_NOFS); | |
35995 | + if (*comp) { | |
35996 | + init_completion(*comp); | |
35997 | + wkinfo->comp = *comp; | |
35998 | + return 0; | |
35999 | + } | |
36000 | + return -ENOMEM; | |
36001 | +} | |
36002 | + | |
36003 | +static void au_wkq_comp_free(struct completion *comp) | |
36004 | +{ | |
1c60b727 | 36005 | + kfree(comp); |
1facf9fc | 36006 | +} |
36007 | + | |
36008 | +#else | |
36009 | + | |
36010 | +/* no braces */ | |
36011 | +#define AuWkqCompDeclare(name) \ | |
36012 | + DECLARE_COMPLETION_ONSTACK(_ ## name); \ | |
36013 | + struct completion *comp = &_ ## name | |
36014 | + | |
36015 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
36016 | +{ | |
36017 | + wkinfo->comp = *comp; | |
36018 | + return 0; | |
36019 | +} | |
36020 | + | |
36021 | +static void au_wkq_comp_free(struct completion *comp __maybe_unused) | |
36022 | +{ | |
36023 | + /* empty */ | |
36024 | +} | |
36025 | +#endif /* 4KSTACKS */ | |
36026 | + | |
53392da6 | 36027 | +static void au_wkq_run(struct au_wkinfo *wkinfo) |
1facf9fc | 36028 | +{ |
53392da6 AM |
36029 | + if (au_ftest_wkq(wkinfo->flags, NEST)) { |
36030 | + if (au_wkq_test()) { | |
38d290e6 JR |
36031 | + AuWarn1("wkq from wkq, unless silly-rename on NFS," |
36032 | + " due to a dead dir by UDBA?\n"); | |
53392da6 AM |
36033 | + AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT)); |
36034 | + } | |
36035 | + } else | |
36036 | + au_dbg_verify_kthread(); | |
36037 | + | |
36038 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) { | |
a1f66529 | 36039 | + INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func); |
9dbd164d | 36040 | + queue_work(au_wkq, &wkinfo->wk); |
4a4d8108 AM |
36041 | + } else { |
36042 | + INIT_WORK(&wkinfo->wk, wkq_func); | |
36043 | + schedule_work(&wkinfo->wk); | |
36044 | + } | |
1facf9fc | 36045 | +} |
36046 | + | |
7f207e10 AM |
36047 | +/* |
36048 | + * Be careful. It is easy to make deadlock happen. | |
36049 | + * processA: lock, wkq and wait | |
36050 | + * processB: wkq and wait, lock in wkq | |
36051 | + * --> deadlock | |
36052 | + */ | |
b752ccd1 | 36053 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args) |
1facf9fc | 36054 | +{ |
36055 | + int err; | |
36056 | + AuWkqCompDeclare(comp); | |
36057 | + struct au_wkinfo wkinfo = { | |
b752ccd1 | 36058 | + .flags = flags, |
1facf9fc | 36059 | + .func = func, |
36060 | + .args = args | |
36061 | + }; | |
36062 | + | |
36063 | + err = au_wkq_comp_alloc(&wkinfo, &comp); | |
8b6a4947 AM |
36064 | + if (unlikely(err)) |
36065 | + goto out; | |
36066 | + err = au_wkq_lockdep_alloc(&wkinfo); | |
36067 | + if (unlikely(err)) | |
36068 | + goto out_comp; | |
1facf9fc | 36069 | + if (!err) { |
53392da6 | 36070 | + au_wkq_run(&wkinfo); |
1facf9fc | 36071 | + /* no timeout, no interrupt */ |
36072 | + wait_for_completion(wkinfo.comp); | |
1facf9fc | 36073 | + } |
8b6a4947 | 36074 | + au_wkq_lockdep_free(&wkinfo); |
1facf9fc | 36075 | + |
8b6a4947 AM |
36076 | +out_comp: |
36077 | + au_wkq_comp_free(comp); | |
36078 | +out: | |
36079 | + destroy_work_on_stack(&wkinfo.wk); | |
1facf9fc | 36080 | + return err; |
1facf9fc | 36081 | +} |
36082 | + | |
027c5e7a AM |
36083 | +/* |
36084 | + * Note: dget/dput() in func for aufs dentries are not supported. It will be a | |
36085 | + * problem in a concurrent umounting. | |
36086 | + */ | |
53392da6 AM |
36087 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
36088 | + unsigned int flags) | |
1facf9fc | 36089 | +{ |
36090 | + int err; | |
36091 | + struct au_wkinfo *wkinfo; | |
36092 | + | |
f0c0a007 | 36093 | + atomic_inc(&au_sbi(sb)->si_nowait.nw_len); |
1facf9fc | 36094 | + |
36095 | + /* | |
36096 | + * wkq_func() must free this wkinfo. | |
36097 | + * it highly depends upon the implementation of workqueue. | |
36098 | + */ | |
36099 | + err = 0; | |
36100 | + wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS); | |
36101 | + if (wkinfo) { | |
7f207e10 | 36102 | + wkinfo->kobj = &au_sbi(sb)->si_kobj; |
53392da6 | 36103 | + wkinfo->flags = flags & ~AuWkq_WAIT; |
1facf9fc | 36104 | + wkinfo->func = func; |
36105 | + wkinfo->args = args; | |
36106 | + wkinfo->comp = NULL; | |
8b6a4947 | 36107 | + au_wkq_lockdep_init(wkinfo); |
7f207e10 | 36108 | + kobject_get(wkinfo->kobj); |
9dbd164d | 36109 | + __module_get(THIS_MODULE); /* todo: ?? */ |
1facf9fc | 36110 | + |
53392da6 | 36111 | + au_wkq_run(wkinfo); |
1facf9fc | 36112 | + } else { |
36113 | + err = -ENOMEM; | |
e49829fe | 36114 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
1facf9fc | 36115 | + } |
36116 | + | |
36117 | + return err; | |
36118 | +} | |
36119 | + | |
36120 | +/* ---------------------------------------------------------------------- */ | |
36121 | + | |
36122 | +void au_nwt_init(struct au_nowait_tasks *nwt) | |
36123 | +{ | |
f0c0a007 AM |
36124 | + atomic_set(&nwt->nw_len, 0); |
36125 | + /* smp_mb(); */ /* atomic_set */ | |
1facf9fc | 36126 | + init_waitqueue_head(&nwt->nw_wq); |
36127 | +} | |
36128 | + | |
36129 | +void au_wkq_fin(void) | |
36130 | +{ | |
9dbd164d | 36131 | + destroy_workqueue(au_wkq); |
1facf9fc | 36132 | +} |
36133 | + | |
36134 | +int __init au_wkq_init(void) | |
36135 | +{ | |
9dbd164d | 36136 | + int err; |
b752ccd1 AM |
36137 | + |
36138 | + err = 0; | |
86dc4139 | 36139 | + au_wkq = alloc_workqueue(AUFS_WKQ_NAME, 0, WQ_DFL_ACTIVE); |
9dbd164d AM |
36140 | + if (IS_ERR(au_wkq)) |
36141 | + err = PTR_ERR(au_wkq); | |
36142 | + else if (!au_wkq) | |
36143 | + err = -ENOMEM; | |
b752ccd1 AM |
36144 | + |
36145 | + return err; | |
1facf9fc | 36146 | +} |
7f207e10 AM |
36147 | diff -urN /usr/share/empty/fs/aufs/wkq.h linux/fs/aufs/wkq.h |
36148 | --- /usr/share/empty/fs/aufs/wkq.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 36149 | +++ linux/fs/aufs/wkq.h 2018-08-12 23:43:05.463458173 +0200 |
062440b3 AM |
36150 | @@ -0,0 +1,94 @@ |
36151 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
1facf9fc | 36152 | +/* |
b00004a5 | 36153 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 36154 | + * |
36155 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36156 | + * it under the terms of the GNU General Public License as published by | |
36157 | + * the Free Software Foundation; either version 2 of the License, or | |
36158 | + * (at your option) any later version. | |
dece6358 AM |
36159 | + * |
36160 | + * This program is distributed in the hope that it will be useful, | |
36161 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36162 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36163 | + * GNU General Public License for more details. | |
36164 | + * | |
36165 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 36166 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 36167 | + */ |
36168 | + | |
36169 | +/* | |
36170 | + * workqueue for asynchronous/super-io operations | |
36171 | + * todo: try new credentials management scheme | |
36172 | + */ | |
36173 | + | |
36174 | +#ifndef __AUFS_WKQ_H__ | |
36175 | +#define __AUFS_WKQ_H__ | |
36176 | + | |
36177 | +#ifdef __KERNEL__ | |
36178 | + | |
8b6a4947 | 36179 | +#include <linux/wait.h> |
5afbbe0d | 36180 | + |
dece6358 AM |
36181 | +struct super_block; |
36182 | + | |
1facf9fc | 36183 | +/* ---------------------------------------------------------------------- */ |
36184 | + | |
36185 | +/* | |
36186 | + * in the next operation, wait for the 'nowait' tasks in system-wide workqueue | |
36187 | + */ | |
36188 | +struct au_nowait_tasks { | |
f0c0a007 | 36189 | + atomic_t nw_len; |
1facf9fc | 36190 | + wait_queue_head_t nw_wq; |
36191 | +}; | |
36192 | + | |
36193 | +/* ---------------------------------------------------------------------- */ | |
36194 | + | |
36195 | +typedef void (*au_wkq_func_t)(void *args); | |
36196 | + | |
36197 | +/* wkq flags */ | |
36198 | +#define AuWkq_WAIT 1 | |
9dbd164d | 36199 | +#define AuWkq_NEST (1 << 1) |
1facf9fc | 36200 | +#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) |
7f207e10 AM |
36201 | +#define au_fset_wkq(flags, name) \ |
36202 | + do { (flags) |= AuWkq_##name; } while (0) | |
36203 | +#define au_fclr_wkq(flags, name) \ | |
36204 | + do { (flags) &= ~AuWkq_##name; } while (0) | |
1facf9fc | 36205 | + |
9dbd164d AM |
36206 | +#ifndef CONFIG_AUFS_HNOTIFY |
36207 | +#undef AuWkq_NEST | |
36208 | +#define AuWkq_NEST 0 | |
36209 | +#endif | |
36210 | + | |
1facf9fc | 36211 | +/* wkq.c */ |
b752ccd1 | 36212 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); |
53392da6 AM |
36213 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
36214 | + unsigned int flags); | |
1facf9fc | 36215 | +void au_nwt_init(struct au_nowait_tasks *nwt); |
36216 | +int __init au_wkq_init(void); | |
36217 | +void au_wkq_fin(void); | |
36218 | + | |
36219 | +/* ---------------------------------------------------------------------- */ | |
36220 | + | |
53392da6 AM |
36221 | +static inline int au_wkq_test(void) |
36222 | +{ | |
36223 | + return current->flags & PF_WQ_WORKER; | |
36224 | +} | |
36225 | + | |
b752ccd1 | 36226 | +static inline int au_wkq_wait(au_wkq_func_t func, void *args) |
1facf9fc | 36227 | +{ |
b752ccd1 | 36228 | + return au_wkq_do_wait(AuWkq_WAIT, func, args); |
1facf9fc | 36229 | +} |
36230 | + | |
36231 | +static inline void au_nwt_done(struct au_nowait_tasks *nwt) | |
36232 | +{ | |
f0c0a007 | 36233 | + if (atomic_dec_and_test(&nwt->nw_len)) |
1facf9fc | 36234 | + wake_up_all(&nwt->nw_wq); |
36235 | +} | |
36236 | + | |
36237 | +static inline int au_nwt_flush(struct au_nowait_tasks *nwt) | |
36238 | +{ | |
f0c0a007 | 36239 | + wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); |
1facf9fc | 36240 | + return 0; |
36241 | +} | |
36242 | + | |
36243 | +#endif /* __KERNEL__ */ | |
36244 | +#endif /* __AUFS_WKQ_H__ */ | |
c1595e42 JR |
36245 | diff -urN /usr/share/empty/fs/aufs/xattr.c linux/fs/aufs/xattr.c |
36246 | --- /usr/share/empty/fs/aufs/xattr.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 36247 | +++ linux/fs/aufs/xattr.c 2018-08-12 23:43:05.466791610 +0200 |
062440b3 | 36248 | @@ -0,0 +1,356 @@ |
cd7a4cd9 | 36249 | +// SPDX-License-Identifier: GPL-2.0 |
c1595e42 | 36250 | +/* |
b00004a5 | 36251 | + * Copyright (C) 2014-2018 Junjiro R. Okajima |
c1595e42 JR |
36252 | + * |
36253 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36254 | + * it under the terms of the GNU General Public License as published by | |
36255 | + * the Free Software Foundation; either version 2 of the License, or | |
36256 | + * (at your option) any later version. | |
36257 | + * | |
36258 | + * This program is distributed in the hope that it will be useful, | |
36259 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36260 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36261 | + * GNU General Public License for more details. | |
36262 | + * | |
36263 | + * You should have received a copy of the GNU General Public License | |
36264 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
36265 | + */ | |
36266 | + | |
36267 | +/* | |
36268 | + * handling xattr functions | |
36269 | + */ | |
36270 | + | |
a2654f78 AM |
36271 | +#include <linux/fs.h> |
36272 | +#include <linux/posix_acl_xattr.h> | |
c1595e42 JR |
36273 | +#include <linux/xattr.h> |
36274 | +#include "aufs.h" | |
36275 | + | |
36276 | +static int au_xattr_ignore(int err, char *name, unsigned int ignore_flags) | |
36277 | +{ | |
36278 | + if (!ignore_flags) | |
36279 | + goto out; | |
36280 | + switch (err) { | |
36281 | + case -ENOMEM: | |
36282 | + case -EDQUOT: | |
36283 | + goto out; | |
36284 | + } | |
36285 | + | |
36286 | + if ((ignore_flags & AuBrAttr_ICEX) == AuBrAttr_ICEX) { | |
36287 | + err = 0; | |
36288 | + goto out; | |
36289 | + } | |
36290 | + | |
36291 | +#define cmp(brattr, prefix) do { \ | |
36292 | + if (!strncmp(name, XATTR_##prefix##_PREFIX, \ | |
36293 | + XATTR_##prefix##_PREFIX_LEN)) { \ | |
36294 | + if (ignore_flags & AuBrAttr_ICEX_##brattr) \ | |
36295 | + err = 0; \ | |
36296 | + goto out; \ | |
36297 | + } \ | |
36298 | + } while (0) | |
36299 | + | |
36300 | + cmp(SEC, SECURITY); | |
36301 | + cmp(SYS, SYSTEM); | |
36302 | + cmp(TR, TRUSTED); | |
36303 | + cmp(USR, USER); | |
36304 | +#undef cmp | |
36305 | + | |
36306 | + if (ignore_flags & AuBrAttr_ICEX_OTH) | |
36307 | + err = 0; | |
36308 | + | |
36309 | +out: | |
36310 | + return err; | |
36311 | +} | |
36312 | + | |
36313 | +static const int au_xattr_out_of_list = AuBrAttr_ICEX_OTH << 1; | |
36314 | + | |
36315 | +static int au_do_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, | |
7e9cd9fe AM |
36316 | + char *name, char **buf, unsigned int ignore_flags, |
36317 | + unsigned int verbose) | |
c1595e42 JR |
36318 | +{ |
36319 | + int err; | |
36320 | + ssize_t ssz; | |
36321 | + struct inode *h_idst; | |
36322 | + | |
36323 | + ssz = vfs_getxattr_alloc(h_src, name, buf, 0, GFP_NOFS); | |
36324 | + err = ssz; | |
36325 | + if (unlikely(err <= 0)) { | |
c1595e42 JR |
36326 | + if (err == -ENODATA |
36327 | + || (err == -EOPNOTSUPP | |
b912730e | 36328 | + && ((ignore_flags & au_xattr_out_of_list) |
5527c038 | 36329 | + || (au_test_nfs_noacl(d_inode(h_src)) |
b912730e AM |
36330 | + && (!strcmp(name, XATTR_NAME_POSIX_ACL_ACCESS) |
36331 | + || !strcmp(name, | |
36332 | + XATTR_NAME_POSIX_ACL_DEFAULT)))) | |
36333 | + )) | |
c1595e42 | 36334 | + err = 0; |
b912730e AM |
36335 | + if (err && (verbose || au_debug_test())) |
36336 | + pr_err("%s, err %d\n", name, err); | |
c1595e42 JR |
36337 | + goto out; |
36338 | + } | |
36339 | + | |
36340 | + /* unlock it temporary */ | |
5527c038 | 36341 | + h_idst = d_inode(h_dst); |
febd17d6 | 36342 | + inode_unlock(h_idst); |
c1595e42 | 36343 | + err = vfsub_setxattr(h_dst, name, *buf, ssz, /*flags*/0); |
febd17d6 | 36344 | + inode_lock_nested(h_idst, AuLsc_I_CHILD2); |
c1595e42 | 36345 | + if (unlikely(err)) { |
7e9cd9fe AM |
36346 | + if (verbose || au_debug_test()) |
36347 | + pr_err("%s, err %d\n", name, err); | |
c1595e42 JR |
36348 | + err = au_xattr_ignore(err, name, ignore_flags); |
36349 | + } | |
36350 | + | |
36351 | +out: | |
36352 | + return err; | |
36353 | +} | |
36354 | + | |
7e9cd9fe AM |
36355 | +int au_cpup_xattr(struct dentry *h_dst, struct dentry *h_src, int ignore_flags, |
36356 | + unsigned int verbose) | |
c1595e42 JR |
36357 | +{ |
36358 | + int err, unlocked, acl_access, acl_default; | |
36359 | + ssize_t ssz; | |
36360 | + struct inode *h_isrc, *h_idst; | |
36361 | + char *value, *p, *o, *e; | |
36362 | + | |
36363 | + /* try stopping to update the source inode while we are referencing */ | |
7e9cd9fe | 36364 | + /* there should not be the parent-child relationship between them */ |
5527c038 JR |
36365 | + h_isrc = d_inode(h_src); |
36366 | + h_idst = d_inode(h_dst); | |
febd17d6 | 36367 | + inode_unlock(h_idst); |
be118d29 | 36368 | + inode_lock_shared_nested(h_isrc, AuLsc_I_CHILD); |
febd17d6 | 36369 | + inode_lock_nested(h_idst, AuLsc_I_CHILD2); |
c1595e42 JR |
36370 | + unlocked = 0; |
36371 | + | |
36372 | + /* some filesystems don't list POSIX ACL, for example tmpfs */ | |
36373 | + ssz = vfs_listxattr(h_src, NULL, 0); | |
36374 | + err = ssz; | |
36375 | + if (unlikely(err < 0)) { | |
36376 | + AuTraceErr(err); | |
36377 | + if (err == -ENODATA | |
36378 | + || err == -EOPNOTSUPP) | |
36379 | + err = 0; /* ignore */ | |
36380 | + goto out; | |
36381 | + } | |
36382 | + | |
36383 | + err = 0; | |
36384 | + p = NULL; | |
36385 | + o = NULL; | |
36386 | + if (ssz) { | |
36387 | + err = -ENOMEM; | |
36388 | + p = kmalloc(ssz, GFP_NOFS); | |
36389 | + o = p; | |
36390 | + if (unlikely(!p)) | |
36391 | + goto out; | |
36392 | + err = vfs_listxattr(h_src, p, ssz); | |
36393 | + } | |
3c1bdaff | 36394 | + inode_unlock_shared(h_isrc); |
c1595e42 JR |
36395 | + unlocked = 1; |
36396 | + AuDbg("err %d, ssz %zd\n", err, ssz); | |
36397 | + if (unlikely(err < 0)) | |
36398 | + goto out_free; | |
36399 | + | |
36400 | + err = 0; | |
36401 | + e = p + ssz; | |
36402 | + value = NULL; | |
36403 | + acl_access = 0; | |
36404 | + acl_default = 0; | |
36405 | + while (!err && p < e) { | |
36406 | + acl_access |= !strncmp(p, XATTR_NAME_POSIX_ACL_ACCESS, | |
36407 | + sizeof(XATTR_NAME_POSIX_ACL_ACCESS) - 1); | |
36408 | + acl_default |= !strncmp(p, XATTR_NAME_POSIX_ACL_DEFAULT, | |
36409 | + sizeof(XATTR_NAME_POSIX_ACL_DEFAULT) | |
36410 | + - 1); | |
7e9cd9fe AM |
36411 | + err = au_do_cpup_xattr(h_dst, h_src, p, &value, ignore_flags, |
36412 | + verbose); | |
c1595e42 JR |
36413 | + p += strlen(p) + 1; |
36414 | + } | |
36415 | + AuTraceErr(err); | |
36416 | + ignore_flags |= au_xattr_out_of_list; | |
36417 | + if (!err && !acl_access) { | |
36418 | + err = au_do_cpup_xattr(h_dst, h_src, | |
36419 | + XATTR_NAME_POSIX_ACL_ACCESS, &value, | |
7e9cd9fe | 36420 | + ignore_flags, verbose); |
c1595e42 JR |
36421 | + AuTraceErr(err); |
36422 | + } | |
36423 | + if (!err && !acl_default) { | |
36424 | + err = au_do_cpup_xattr(h_dst, h_src, | |
36425 | + XATTR_NAME_POSIX_ACL_DEFAULT, &value, | |
7e9cd9fe | 36426 | + ignore_flags, verbose); |
c1595e42 JR |
36427 | + AuTraceErr(err); |
36428 | + } | |
36429 | + | |
8b6a4947 | 36430 | + kfree(value); |
c1595e42 JR |
36431 | + |
36432 | +out_free: | |
8b6a4947 | 36433 | + kfree(o); |
c1595e42 JR |
36434 | +out: |
36435 | + if (!unlocked) | |
3c1bdaff | 36436 | + inode_unlock_shared(h_isrc); |
c1595e42 JR |
36437 | + AuTraceErr(err); |
36438 | + return err; | |
36439 | +} | |
36440 | + | |
36441 | +/* ---------------------------------------------------------------------- */ | |
36442 | + | |
a2654f78 AM |
36443 | +static int au_smack_reentering(struct super_block *sb) |
36444 | +{ | |
36445 | +#if IS_ENABLED(CONFIG_SECURITY_SMACK) | |
36446 | + /* | |
36447 | + * as a part of lookup, smack_d_instantiate() is called, and it calls | |
36448 | + * i_op->getxattr(). ouch. | |
36449 | + */ | |
36450 | + return si_pid_test(sb); | |
36451 | +#else | |
36452 | + return 0; | |
36453 | +#endif | |
36454 | +} | |
36455 | + | |
c1595e42 JR |
36456 | +enum { |
36457 | + AU_XATTR_LIST, | |
36458 | + AU_XATTR_GET | |
36459 | +}; | |
36460 | + | |
36461 | +struct au_lgxattr { | |
36462 | + int type; | |
36463 | + union { | |
36464 | + struct { | |
36465 | + char *list; | |
36466 | + size_t size; | |
36467 | + } list; | |
36468 | + struct { | |
36469 | + const char *name; | |
36470 | + void *value; | |
36471 | + size_t size; | |
36472 | + } get; | |
36473 | + } u; | |
36474 | +}; | |
36475 | + | |
36476 | +static ssize_t au_lgxattr(struct dentry *dentry, struct au_lgxattr *arg) | |
36477 | +{ | |
36478 | + ssize_t err; | |
a2654f78 | 36479 | + int reenter; |
c1595e42 JR |
36480 | + struct path h_path; |
36481 | + struct super_block *sb; | |
36482 | + | |
36483 | + sb = dentry->d_sb; | |
a2654f78 AM |
36484 | + reenter = au_smack_reentering(sb); |
36485 | + if (!reenter) { | |
36486 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
36487 | + if (unlikely(err)) | |
36488 | + goto out; | |
36489 | + } | |
36490 | + err = au_h_path_getattr(dentry, /*force*/1, &h_path, reenter); | |
c1595e42 JR |
36491 | + if (unlikely(err)) |
36492 | + goto out_si; | |
36493 | + if (unlikely(!h_path.dentry)) | |
36494 | + /* illegally overlapped or something */ | |
36495 | + goto out_di; /* pretending success */ | |
36496 | + | |
36497 | + /* always topmost entry only */ | |
36498 | + switch (arg->type) { | |
36499 | + case AU_XATTR_LIST: | |
36500 | + err = vfs_listxattr(h_path.dentry, | |
36501 | + arg->u.list.list, arg->u.list.size); | |
36502 | + break; | |
36503 | + case AU_XATTR_GET: | |
5afbbe0d | 36504 | + AuDebugOn(d_is_negative(h_path.dentry)); |
c1595e42 JR |
36505 | + err = vfs_getxattr(h_path.dentry, |
36506 | + arg->u.get.name, arg->u.get.value, | |
36507 | + arg->u.get.size); | |
36508 | + break; | |
36509 | + } | |
36510 | + | |
36511 | +out_di: | |
a2654f78 AM |
36512 | + if (!reenter) |
36513 | + di_read_unlock(dentry, AuLock_IR); | |
c1595e42 | 36514 | +out_si: |
a2654f78 AM |
36515 | + if (!reenter) |
36516 | + si_read_unlock(sb); | |
c1595e42 JR |
36517 | +out: |
36518 | + AuTraceErr(err); | |
36519 | + return err; | |
36520 | +} | |
36521 | + | |
36522 | +ssize_t aufs_listxattr(struct dentry *dentry, char *list, size_t size) | |
36523 | +{ | |
36524 | + struct au_lgxattr arg = { | |
36525 | + .type = AU_XATTR_LIST, | |
36526 | + .u.list = { | |
36527 | + .list = list, | |
36528 | + .size = size | |
36529 | + }, | |
36530 | + }; | |
36531 | + | |
36532 | + return au_lgxattr(dentry, &arg); | |
36533 | +} | |
36534 | + | |
f2c43d5f AM |
36535 | +static ssize_t au_getxattr(struct dentry *dentry, |
36536 | + struct inode *inode __maybe_unused, | |
36537 | + const char *name, void *value, size_t size) | |
c1595e42 JR |
36538 | +{ |
36539 | + struct au_lgxattr arg = { | |
36540 | + .type = AU_XATTR_GET, | |
36541 | + .u.get = { | |
36542 | + .name = name, | |
36543 | + .value = value, | |
36544 | + .size = size | |
36545 | + }, | |
36546 | + }; | |
36547 | + | |
36548 | + return au_lgxattr(dentry, &arg); | |
36549 | +} | |
36550 | + | |
f2c43d5f AM |
36551 | +static int au_setxattr(struct dentry *dentry, struct inode *inode, |
36552 | + const char *name, const void *value, size_t size, | |
36553 | + int flags) | |
c1595e42 | 36554 | +{ |
f2c43d5f | 36555 | + struct au_sxattr arg = { |
c1595e42 JR |
36556 | + .type = AU_XATTR_SET, |
36557 | + .u.set = { | |
36558 | + .name = name, | |
36559 | + .value = value, | |
36560 | + .size = size, | |
36561 | + .flags = flags | |
36562 | + }, | |
36563 | + }; | |
36564 | + | |
f2c43d5f | 36565 | + return au_sxattr(dentry, inode, &arg); |
c1595e42 JR |
36566 | +} |
36567 | + | |
36568 | +/* ---------------------------------------------------------------------- */ | |
36569 | + | |
f2c43d5f AM |
36570 | +static int au_xattr_get(const struct xattr_handler *handler, |
36571 | + struct dentry *dentry, struct inode *inode, | |
36572 | + const char *name, void *buffer, size_t size) | |
c1595e42 | 36573 | +{ |
f2c43d5f | 36574 | + return au_getxattr(dentry, inode, name, buffer, size); |
c1595e42 JR |
36575 | +} |
36576 | + | |
f2c43d5f AM |
36577 | +static int au_xattr_set(const struct xattr_handler *handler, |
36578 | + struct dentry *dentry, struct inode *inode, | |
36579 | + const char *name, const void *value, size_t size, | |
36580 | + int flags) | |
c1595e42 | 36581 | +{ |
f2c43d5f | 36582 | + return au_setxattr(dentry, inode, name, value, size, flags); |
c1595e42 JR |
36583 | +} |
36584 | + | |
36585 | +static const struct xattr_handler au_xattr_handler = { | |
f2c43d5f AM |
36586 | + .name = "", |
36587 | + .prefix = "", | |
c1595e42 JR |
36588 | + .get = au_xattr_get, |
36589 | + .set = au_xattr_set | |
c1595e42 JR |
36590 | +}; |
36591 | + | |
36592 | +static const struct xattr_handler *au_xattr_handlers[] = { | |
a2654f78 AM |
36593 | +#ifdef CONFIG_FS_POSIX_ACL |
36594 | + &posix_acl_access_xattr_handler, | |
36595 | + &posix_acl_default_xattr_handler, | |
36596 | +#endif | |
36597 | + &au_xattr_handler, /* must be last */ | |
f2c43d5f | 36598 | + NULL |
c1595e42 JR |
36599 | +}; |
36600 | + | |
36601 | +void au_xattr_init(struct super_block *sb) | |
36602 | +{ | |
f2c43d5f | 36603 | + sb->s_xattr = au_xattr_handlers; |
c1595e42 | 36604 | +} |
7f207e10 AM |
36605 | diff -urN /usr/share/empty/fs/aufs/xino.c linux/fs/aufs/xino.c |
36606 | --- /usr/share/empty/fs/aufs/xino.c 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 36607 | +++ linux/fs/aufs/xino.c 2018-08-12 23:43:05.466791610 +0200 |
062440b3 | 36608 | @@ -0,0 +1,1593 @@ |
cd7a4cd9 | 36609 | +// SPDX-License-Identifier: GPL-2.0 |
1facf9fc | 36610 | +/* |
b00004a5 | 36611 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
1facf9fc | 36612 | + * |
36613 | + * This program, aufs is free software; you can redistribute it and/or modify | |
36614 | + * it under the terms of the GNU General Public License as published by | |
36615 | + * the Free Software Foundation; either version 2 of the License, or | |
36616 | + * (at your option) any later version. | |
dece6358 AM |
36617 | + * |
36618 | + * This program is distributed in the hope that it will be useful, | |
36619 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
36620 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
36621 | + * GNU General Public License for more details. | |
36622 | + * | |
36623 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 36624 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
1facf9fc | 36625 | + */ |
36626 | + | |
36627 | +/* | |
36628 | + * external inode number translation table and bitmap | |
062440b3 AM |
36629 | + * |
36630 | + * things to consider | |
36631 | + * - the lifetime | |
36632 | + * + au_xino object | |
36633 | + * + XINO files (xino, xib, xigen) | |
36634 | + * + dynamic debugfs entries (xiN) | |
36635 | + * + static debugfs entries (xib, xigen) | |
36636 | + * + static sysfs entry (xi_path) | |
36637 | + * - several entry points to handle them. | |
36638 | + * + mount(2) without xino option (default) | |
36639 | + * + mount(2) with xino option | |
36640 | + * + mount(2) with noxino option | |
36641 | + * + umount(2) | |
36642 | + * + remount with add/del branches | |
36643 | + * + remount with xino/noxino options | |
1facf9fc | 36644 | + */ |
36645 | + | |
36646 | +#include <linux/seq_file.h> | |
392086de | 36647 | +#include <linux/statfs.h> |
1facf9fc | 36648 | +#include "aufs.h" |
36649 | + | |
062440b3 AM |
36650 | +static aufs_bindex_t sbr_find_shared(struct super_block *sb, aufs_bindex_t btop, |
36651 | + aufs_bindex_t bbot, | |
36652 | + struct super_block *h_sb) | |
1facf9fc | 36653 | +{ |
062440b3 AM |
36654 | + /* todo: try binary-search if the branches are many */ |
36655 | + for (; btop <= bbot; btop++) | |
36656 | + if (h_sb == au_sbr_sb(sb, btop)) | |
36657 | + return btop; | |
36658 | + return -1; | |
be52b249 AM |
36659 | +} |
36660 | + | |
062440b3 AM |
36661 | +/* |
36662 | + * find another branch who is on the same filesystem of the specified | |
36663 | + * branch{@btgt}. search until @bbot. | |
36664 | + */ | |
36665 | +static aufs_bindex_t is_sb_shared(struct super_block *sb, aufs_bindex_t btgt, | |
36666 | + aufs_bindex_t bbot) | |
1facf9fc | 36667 | +{ |
062440b3 AM |
36668 | + aufs_bindex_t bindex; |
36669 | + struct super_block *tgt_sb; | |
1facf9fc | 36670 | + |
062440b3 AM |
36671 | + tgt_sb = au_sbr_sb(sb, btgt); |
36672 | + bindex = sbr_find_shared(sb, /*btop*/0, btgt - 1, tgt_sb); | |
36673 | + if (bindex < 0) | |
36674 | + bindex = sbr_find_shared(sb, btgt + 1, bbot, tgt_sb); | |
1facf9fc | 36675 | + |
062440b3 | 36676 | + return bindex; |
1facf9fc | 36677 | +} |
36678 | + | |
36679 | +/* ---------------------------------------------------------------------- */ | |
36680 | + | |
36681 | +/* | |
062440b3 | 36682 | + * stop unnecessary notify events at creating xino files |
1facf9fc | 36683 | + */ |
062440b3 AM |
36684 | +struct au_xino_lock_dir { |
36685 | + struct au_hinode *hdir; | |
36686 | + struct dentry *parent; | |
36687 | + struct inode *dir; | |
36688 | +}; | |
36689 | + | |
36690 | +static struct dentry *au_dget_parent_lock(struct dentry *dentry, | |
36691 | + unsigned int lsc) | |
1facf9fc | 36692 | +{ |
062440b3 AM |
36693 | + struct dentry *parent; |
36694 | + struct inode *dir; | |
1facf9fc | 36695 | + |
062440b3 | 36696 | + parent = dget_parent(dentry); |
5527c038 | 36697 | + dir = d_inode(parent); |
062440b3 AM |
36698 | + inode_lock_nested(dir, lsc); |
36699 | +#if 0 /* it should not happen */ | |
36700 | + spin_lock(&dentry->d_lock); | |
36701 | + if (unlikely(dentry->d_parent != parent)) { | |
36702 | + spin_unlock(&dentry->d_lock); | |
36703 | + inode_unlock(dir); | |
36704 | + dput(parent); | |
36705 | + parent = NULL; | |
1facf9fc | 36706 | + goto out; |
36707 | + } | |
062440b3 | 36708 | + spin_unlock(&dentry->d_lock); |
1facf9fc | 36709 | + |
4f0767ce | 36710 | +out: |
062440b3 AM |
36711 | +#endif |
36712 | + return parent; | |
1facf9fc | 36713 | +} |
36714 | + | |
062440b3 | 36715 | +static void au_xino_lock_dir(struct super_block *sb, struct path *xipath, |
1facf9fc | 36716 | + struct au_xino_lock_dir *ldir) |
36717 | +{ | |
36718 | + aufs_bindex_t brid, bindex; | |
36719 | + | |
36720 | + ldir->hdir = NULL; | |
36721 | + bindex = -1; | |
36722 | + brid = au_xino_brid(sb); | |
36723 | + if (brid >= 0) | |
36724 | + bindex = au_br_index(sb, brid); | |
36725 | + if (bindex >= 0) { | |
062440b3 | 36726 | + /* rw branch root */ |
5527c038 | 36727 | + ldir->hdir = au_hi(d_inode(sb->s_root), bindex); |
5afbbe0d | 36728 | + au_hn_inode_lock_nested(ldir->hdir, AuLsc_I_PARENT); |
1facf9fc | 36729 | + } else { |
062440b3 AM |
36730 | + /* other */ |
36731 | + ldir->parent = au_dget_parent_lock(xipath->dentry, | |
36732 | + AuLsc_I_PARENT); | |
febd17d6 | 36733 | + ldir->dir = d_inode(ldir->parent); |
1facf9fc | 36734 | + } |
36735 | +} | |
36736 | + | |
36737 | +static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir) | |
36738 | +{ | |
36739 | + if (ldir->hdir) | |
5afbbe0d | 36740 | + au_hn_inode_unlock(ldir->hdir); |
1facf9fc | 36741 | + else { |
febd17d6 | 36742 | + inode_unlock(ldir->dir); |
1facf9fc | 36743 | + dput(ldir->parent); |
36744 | + } | |
36745 | +} | |
36746 | + | |
36747 | +/* ---------------------------------------------------------------------- */ | |
36748 | + | |
062440b3 AM |
36749 | +/* |
36750 | + * create and set a new xino file | |
36751 | + */ | |
36752 | +struct file *au_xino_create(struct super_block *sb, char *fpath, int silent) | |
36753 | +{ | |
36754 | + struct file *file; | |
36755 | + struct dentry *h_parent, *d; | |
36756 | + struct inode *h_dir, *inode; | |
36757 | + int err; | |
36758 | + | |
36759 | + /* | |
36760 | + * at mount-time, and the xino file is the default path, | |
36761 | + * hnotify is disabled so we have no notify events to ignore. | |
36762 | + * when a user specified the xino, we cannot get au_hdir to be ignored. | |
36763 | + */ | |
36764 | + file = vfsub_filp_open(fpath, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE | |
36765 | + /* | __FMODE_NONOTIFY */, | |
cd7a4cd9 | 36766 | + 0666); |
062440b3 AM |
36767 | + if (IS_ERR(file)) { |
36768 | + if (!silent) | |
36769 | + pr_err("open %s(%ld)\n", fpath, PTR_ERR(file)); | |
36770 | + return file; | |
36771 | + } | |
36772 | + | |
36773 | + /* keep file count */ | |
36774 | + err = 0; | |
36775 | + d = file->f_path.dentry; | |
36776 | + h_parent = au_dget_parent_lock(d, AuLsc_I_PARENT); | |
36777 | + /* mnt_want_write() is unnecessary here */ | |
36778 | + h_dir = d_inode(h_parent); | |
36779 | + inode = file_inode(file); | |
36780 | + /* no delegation since it is just created */ | |
36781 | + if (inode->i_nlink) | |
36782 | + err = vfsub_unlink(h_dir, &file->f_path, /*delegated*/NULL, | |
36783 | + /*force*/0); | |
36784 | + inode_unlock(h_dir); | |
36785 | + dput(h_parent); | |
36786 | + if (unlikely(err)) { | |
36787 | + if (!silent) | |
36788 | + pr_err("unlink %s(%d)\n", fpath, err); | |
36789 | + goto out; | |
36790 | + } | |
36791 | + | |
36792 | + err = -EINVAL; | |
36793 | + if (unlikely(sb == d->d_sb)) { | |
36794 | + if (!silent) | |
36795 | + pr_err("%s must be outside\n", fpath); | |
36796 | + goto out; | |
36797 | + } | |
36798 | + if (unlikely(au_test_fs_bad_xino(d->d_sb))) { | |
36799 | + if (!silent) | |
36800 | + pr_err("xino doesn't support %s(%s)\n", | |
36801 | + fpath, au_sbtype(d->d_sb)); | |
36802 | + goto out; | |
36803 | + } | |
36804 | + return file; /* success */ | |
36805 | + | |
36806 | +out: | |
36807 | + fput(file); | |
36808 | + file = ERR_PTR(err); | |
36809 | + return file; | |
36810 | +} | |
36811 | + | |
36812 | +/* | |
36813 | + * create a new xinofile at the same place/path as @base. | |
36814 | + */ | |
36815 | +struct file *au_xino_create2(struct super_block *sb, struct path *base, | |
36816 | + struct file *copy_src) | |
36817 | +{ | |
36818 | + struct file *file; | |
36819 | + struct dentry *dentry, *parent; | |
36820 | + struct inode *dir, *delegated; | |
36821 | + struct qstr *name; | |
36822 | + struct path path; | |
36823 | + int err, do_unlock; | |
36824 | + struct au_xino_lock_dir ldir; | |
36825 | + | |
36826 | + do_unlock = 1; | |
36827 | + au_xino_lock_dir(sb, base, &ldir); | |
36828 | + dentry = base->dentry; | |
36829 | + parent = dentry->d_parent; /* dir inode is locked */ | |
36830 | + dir = d_inode(parent); | |
36831 | + IMustLock(dir); | |
36832 | + | |
36833 | + name = &dentry->d_name; | |
36834 | + path.dentry = vfsub_lookup_one_len(name->name, parent, name->len); | |
36835 | + if (IS_ERR(path.dentry)) { | |
36836 | + file = (void *)path.dentry; | |
36837 | + pr_err("%pd lookup err %ld\n", dentry, PTR_ERR(path.dentry)); | |
36838 | + goto out; | |
36839 | + } | |
36840 | + | |
36841 | + /* no need to mnt_want_write() since we call dentry_open() later */ | |
cd7a4cd9 | 36842 | + err = vfs_create(dir, path.dentry, 0666, NULL); |
062440b3 AM |
36843 | + if (unlikely(err)) { |
36844 | + file = ERR_PTR(err); | |
36845 | + pr_err("%pd create err %d\n", dentry, err); | |
36846 | + goto out_dput; | |
36847 | + } | |
36848 | + | |
36849 | + path.mnt = base->mnt; | |
36850 | + file = vfsub_dentry_open(&path, | |
36851 | + O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE | |
36852 | + /* | __FMODE_NONOTIFY */); | |
36853 | + if (IS_ERR(file)) { | |
36854 | + pr_err("%pd open err %ld\n", dentry, PTR_ERR(file)); | |
36855 | + goto out_dput; | |
36856 | + } | |
36857 | + | |
36858 | + delegated = NULL; | |
36859 | + err = vfsub_unlink(dir, &file->f_path, &delegated, /*force*/0); | |
36860 | + au_xino_unlock_dir(&ldir); | |
36861 | + do_unlock = 0; | |
36862 | + if (unlikely(err == -EWOULDBLOCK)) { | |
36863 | + pr_warn("cannot retry for NFSv4 delegation" | |
36864 | + " for an internal unlink\n"); | |
36865 | + iput(delegated); | |
36866 | + } | |
36867 | + if (unlikely(err)) { | |
36868 | + pr_err("%pd unlink err %d\n", dentry, err); | |
36869 | + goto out_fput; | |
36870 | + } | |
36871 | + | |
36872 | + if (copy_src) { | |
36873 | + /* no one can touch copy_src xino */ | |
36874 | + err = au_copy_file(file, copy_src, vfsub_f_size_read(copy_src)); | |
36875 | + if (unlikely(err)) { | |
36876 | + pr_err("%pd copy err %d\n", dentry, err); | |
36877 | + goto out_fput; | |
36878 | + } | |
36879 | + } | |
36880 | + goto out_dput; /* success */ | |
1facf9fc | 36881 | + |
062440b3 AM |
36882 | +out_fput: |
36883 | + fput(file); | |
36884 | + file = ERR_PTR(err); | |
36885 | +out_dput: | |
36886 | + dput(path.dentry); | |
36887 | +out: | |
36888 | + if (do_unlock) | |
36889 | + au_xino_unlock_dir(&ldir); | |
36890 | + return file; | |
36891 | +} | |
36892 | + | |
36893 | +/* ---------------------------------------------------------------------- */ | |
36894 | + | |
36895 | +/* | |
36896 | + * truncate xino files | |
36897 | + */ | |
1facf9fc | 36898 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex) |
36899 | +{ | |
36900 | + int err; | |
392086de AM |
36901 | + unsigned long jiffy; |
36902 | + blkcnt_t blocks; | |
062440b3 | 36903 | + aufs_bindex_t bbot; |
392086de | 36904 | + struct kstatfs *st; |
1facf9fc | 36905 | + struct au_branch *br; |
36906 | + struct file *new_xino, *file; | |
062440b3 | 36907 | + struct path *path; |
1facf9fc | 36908 | + |
392086de | 36909 | + err = -ENOMEM; |
be52b249 | 36910 | + st = kmalloc(sizeof(*st), GFP_NOFS); |
392086de AM |
36911 | + if (unlikely(!st)) |
36912 | + goto out; | |
36913 | + | |
1facf9fc | 36914 | + err = -EINVAL; |
5afbbe0d AM |
36915 | + bbot = au_sbbot(sb); |
36916 | + if (unlikely(bindex < 0 || bbot < bindex)) | |
392086de | 36917 | + goto out_st; |
1facf9fc | 36918 | + br = au_sbr(sb, bindex); |
062440b3 | 36919 | + file = au_xino_file(br); |
1facf9fc | 36920 | + if (!file) |
392086de AM |
36921 | + goto out_st; |
36922 | + | |
062440b3 AM |
36923 | + path = &file->f_path; |
36924 | + err = vfs_statfs(path, st); | |
392086de AM |
36925 | + if (unlikely(err)) |
36926 | + AuErr1("statfs err %d, ignored\n", err); | |
36927 | + jiffy = jiffies; | |
36928 | + blocks = file_inode(file)->i_blocks; | |
36929 | + pr_info("begin truncating xino(b%d), ib%llu, %llu/%llu free blks\n", | |
36930 | + bindex, (u64)blocks, st->f_bfree, st->f_blocks); | |
1facf9fc | 36931 | + |
062440b3 | 36932 | + new_xino = au_xino_create2(sb, path, file); |
1facf9fc | 36933 | + err = PTR_ERR(new_xino); |
392086de AM |
36934 | + if (IS_ERR(new_xino)) { |
36935 | + pr_err("err %d, ignored\n", err); | |
36936 | + goto out_st; | |
36937 | + } | |
1facf9fc | 36938 | + err = 0; |
062440b3 | 36939 | + au_xino_file_set(br, new_xino); |
1facf9fc | 36940 | + |
392086de AM |
36941 | + err = vfs_statfs(&new_xino->f_path, st); |
36942 | + if (!err) { | |
36943 | + pr_info("end truncating xino(b%d), ib%llu, %llu/%llu free blks\n", | |
36944 | + bindex, (u64)file_inode(new_xino)->i_blocks, | |
36945 | + st->f_bfree, st->f_blocks); | |
36946 | + if (file_inode(new_xino)->i_blocks < blocks) | |
36947 | + au_sbi(sb)->si_xino_jiffy = jiffy; | |
36948 | + } else | |
36949 | + AuErr1("statfs err %d, ignored\n", err); | |
062440b3 | 36950 | + fput(new_xino); |
392086de AM |
36951 | + |
36952 | +out_st: | |
1c60b727 | 36953 | + kfree(st); |
4f0767ce | 36954 | +out: |
1facf9fc | 36955 | + return err; |
36956 | +} | |
36957 | + | |
36958 | +struct xino_do_trunc_args { | |
36959 | + struct super_block *sb; | |
36960 | + struct au_branch *br; | |
36961 | +}; | |
36962 | + | |
36963 | +static void xino_do_trunc(void *_args) | |
36964 | +{ | |
36965 | + struct xino_do_trunc_args *args = _args; | |
36966 | + struct super_block *sb; | |
36967 | + struct au_branch *br; | |
36968 | + struct inode *dir; | |
36969 | + int err; | |
36970 | + aufs_bindex_t bindex; | |
36971 | + | |
36972 | + err = 0; | |
36973 | + sb = args->sb; | |
5527c038 | 36974 | + dir = d_inode(sb->s_root); |
1facf9fc | 36975 | + br = args->br; |
36976 | + | |
36977 | + si_noflush_write_lock(sb); | |
36978 | + ii_read_lock_parent(dir); | |
36979 | + bindex = au_br_index(sb, br->br_id); | |
36980 | + err = au_xino_trunc(sb, bindex); | |
1facf9fc | 36981 | + ii_read_unlock(dir); |
36982 | + if (unlikely(err)) | |
392086de | 36983 | + pr_warn("err b%d, (%d)\n", bindex, err); |
062440b3 | 36984 | + atomic_dec(&br->br_xino->xi_truncating); |
5afbbe0d | 36985 | + au_br_put(br); |
1facf9fc | 36986 | + si_write_unlock(sb); |
027c5e7a | 36987 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
1c60b727 | 36988 | + kfree(args); |
1facf9fc | 36989 | +} |
36990 | + | |
392086de AM |
36991 | +static int xino_trunc_test(struct super_block *sb, struct au_branch *br) |
36992 | +{ | |
36993 | + int err; | |
36994 | + struct kstatfs st; | |
36995 | + struct au_sbinfo *sbinfo; | |
062440b3 | 36996 | + struct file *file; |
392086de AM |
36997 | + |
36998 | + /* todo: si_xino_expire and the ratio should be customizable */ | |
36999 | + sbinfo = au_sbi(sb); | |
37000 | + if (time_before(jiffies, | |
37001 | + sbinfo->si_xino_jiffy + sbinfo->si_xino_expire)) | |
37002 | + return 0; | |
37003 | + | |
37004 | + /* truncation border */ | |
062440b3 AM |
37005 | + file = au_xino_file(br); |
37006 | + AuDebugOn(!file); | |
37007 | + err = vfs_statfs(&file->f_path, &st); | |
392086de AM |
37008 | + if (unlikely(err)) { |
37009 | + AuErr1("statfs err %d, ignored\n", err); | |
37010 | + return 0; | |
37011 | + } | |
37012 | + if (div64_u64(st.f_bfree * 100, st.f_blocks) >= AUFS_XINO_DEF_TRUNC) | |
37013 | + return 0; | |
37014 | + | |
37015 | + return 1; | |
37016 | +} | |
37017 | + | |
1facf9fc | 37018 | +static void xino_try_trunc(struct super_block *sb, struct au_branch *br) |
37019 | +{ | |
37020 | + struct xino_do_trunc_args *args; | |
37021 | + int wkq_err; | |
37022 | + | |
392086de | 37023 | + if (!xino_trunc_test(sb, br)) |
1facf9fc | 37024 | + return; |
37025 | + | |
062440b3 | 37026 | + if (atomic_inc_return(&br->br_xino->xi_truncating) > 1) |
1facf9fc | 37027 | + goto out; |
37028 | + | |
37029 | + /* lock and kfree() will be called in trunc_xino() */ | |
37030 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
37031 | + if (unlikely(!args)) { | |
37032 | + AuErr1("no memory\n"); | |
f0c0a007 | 37033 | + goto out; |
1facf9fc | 37034 | + } |
37035 | + | |
5afbbe0d | 37036 | + au_br_get(br); |
1facf9fc | 37037 | + args->sb = sb; |
37038 | + args->br = br; | |
53392da6 | 37039 | + wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0); |
1facf9fc | 37040 | + if (!wkq_err) |
37041 | + return; /* success */ | |
37042 | + | |
4a4d8108 | 37043 | + pr_err("wkq %d\n", wkq_err); |
5afbbe0d | 37044 | + au_br_put(br); |
1c60b727 | 37045 | + kfree(args); |
1facf9fc | 37046 | + |
4f0767ce | 37047 | +out: |
062440b3 | 37048 | + atomic_dec(&br->br_xino->xi_truncating); |
1facf9fc | 37049 | +} |
37050 | + | |
37051 | +/* ---------------------------------------------------------------------- */ | |
37052 | + | |
062440b3 AM |
37053 | +/* |
37054 | + * read @ino from xinofile for the specified branch{@sb, @bindex} | |
37055 | + * at the position of @h_ino. | |
37056 | + */ | |
37057 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
37058 | + ino_t *ino) | |
37059 | +{ | |
37060 | + int err; | |
37061 | + ssize_t sz; | |
37062 | + loff_t pos; | |
37063 | + struct au_branch *br; | |
37064 | + struct file *file; | |
37065 | + struct au_sbinfo *sbinfo; | |
37066 | + | |
37067 | + *ino = 0; | |
37068 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
37069 | + return 0; /* no xino */ | |
37070 | + | |
37071 | + err = 0; | |
37072 | + sbinfo = au_sbi(sb); | |
37073 | + pos = h_ino; | |
37074 | + if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) { | |
37075 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
37076 | + return -EFBIG; | |
37077 | + } | |
37078 | + pos *= sizeof(*ino); | |
37079 | + | |
37080 | + br = au_sbr(sb, bindex); | |
37081 | + file = au_xino_file(br); | |
37082 | + if (vfsub_f_size_read(file) < pos + sizeof(*ino)) | |
37083 | + return 0; /* no ino */ | |
37084 | + | |
37085 | + sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos); | |
37086 | + if (sz == sizeof(*ino)) | |
37087 | + return 0; /* success */ | |
37088 | + | |
37089 | + err = sz; | |
37090 | + if (unlikely(sz >= 0)) { | |
37091 | + err = -EIO; | |
37092 | + AuIOErr("xino read error (%zd)\n", sz); | |
37093 | + } | |
37094 | + | |
37095 | + return err; | |
37096 | +} | |
37097 | + | |
5527c038 | 37098 | +static int au_xino_do_write(vfs_writef_t write, struct file *file, |
1facf9fc | 37099 | + ino_t h_ino, ino_t ino) |
37100 | +{ | |
37101 | + loff_t pos; | |
37102 | + ssize_t sz; | |
37103 | + | |
37104 | + pos = h_ino; | |
37105 | + if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) { | |
37106 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
37107 | + return -EFBIG; | |
37108 | + } | |
37109 | + pos *= sizeof(ino); | |
37110 | + sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos); | |
37111 | + if (sz == sizeof(ino)) | |
37112 | + return 0; /* success */ | |
37113 | + | |
37114 | + AuIOErr("write failed (%zd)\n", sz); | |
37115 | + return -EIO; | |
37116 | +} | |
37117 | + | |
37118 | +/* | |
37119 | + * write @ino to the xinofile for the specified branch{@sb, @bindex} | |
37120 | + * at the position of @h_ino. | |
37121 | + * even if @ino is zero, it is written to the xinofile and means no entry. | |
37122 | + * if the size of the xino file on a specific filesystem exceeds the watermark, | |
37123 | + * try truncating it. | |
37124 | + */ | |
37125 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
37126 | + ino_t ino) | |
37127 | +{ | |
37128 | + int err; | |
37129 | + unsigned int mnt_flags; | |
37130 | + struct au_branch *br; | |
37131 | + | |
37132 | + BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max) | |
37133 | + || ((loff_t)-1) > 0); | |
dece6358 | 37134 | + SiMustAnyLock(sb); |
1facf9fc | 37135 | + |
37136 | + mnt_flags = au_mntflags(sb); | |
37137 | + if (!au_opt_test(mnt_flags, XINO)) | |
37138 | + return 0; | |
37139 | + | |
37140 | + br = au_sbr(sb, bindex); | |
062440b3 AM |
37141 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, au_xino_file(br), h_ino, |
37142 | + ino); | |
1facf9fc | 37143 | + if (!err) { |
37144 | + if (au_opt_test(mnt_flags, TRUNC_XINO) | |
86dc4139 | 37145 | + && au_test_fs_trunc_xino(au_br_sb(br))) |
1facf9fc | 37146 | + xino_try_trunc(sb, br); |
37147 | + return 0; /* success */ | |
37148 | + } | |
37149 | + | |
37150 | + AuIOErr("write failed (%d)\n", err); | |
37151 | + return -EIO; | |
37152 | +} | |
37153 | + | |
062440b3 AM |
37154 | +static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, |
37155 | + size_t size, loff_t *pos); | |
1facf9fc | 37156 | + |
062440b3 AM |
37157 | +/* todo: unnecessary to support mmap_sem since kernel-space? */ |
37158 | +ssize_t xino_fread(vfs_readf_t func, struct file *file, void *kbuf, size_t size, | |
37159 | + loff_t *pos) | |
37160 | +{ | |
37161 | + ssize_t err; | |
37162 | + mm_segment_t oldfs; | |
37163 | + union { | |
37164 | + void *k; | |
37165 | + char __user *u; | |
37166 | + } buf; | |
37167 | + int i; | |
37168 | + const int prevent_endless = 10; | |
1facf9fc | 37169 | + |
062440b3 AM |
37170 | + i = 0; |
37171 | + buf.k = kbuf; | |
37172 | + oldfs = get_fs(); | |
37173 | + set_fs(KERNEL_DS); | |
37174 | + do { | |
37175 | + err = func(file, buf.u, size, pos); | |
37176 | + if (err == -EINTR | |
37177 | + && !au_wkq_test() | |
37178 | + && fatal_signal_pending(current)) { | |
37179 | + set_fs(oldfs); | |
37180 | + err = xino_fread_wkq(func, file, kbuf, size, pos); | |
37181 | + BUG_ON(err == -EINTR); | |
37182 | + oldfs = get_fs(); | |
37183 | + set_fs(KERNEL_DS); | |
37184 | + } | |
37185 | + } while (i++ < prevent_endless | |
37186 | + && (err == -EAGAIN || err == -EINTR)); | |
37187 | + set_fs(oldfs); | |
37188 | + | |
37189 | +#if 0 /* reserved for future use */ | |
37190 | + if (err > 0) | |
37191 | + fsnotify_access(file->f_path.dentry); | |
37192 | +#endif | |
37193 | + | |
37194 | + return err; | |
37195 | +} | |
37196 | + | |
37197 | +struct xino_fread_args { | |
37198 | + ssize_t *errp; | |
37199 | + vfs_readf_t func; | |
37200 | + struct file *file; | |
37201 | + void *buf; | |
37202 | + size_t size; | |
37203 | + loff_t *pos; | |
37204 | +}; | |
37205 | + | |
37206 | +static void call_xino_fread(void *args) | |
37207 | +{ | |
37208 | + struct xino_fread_args *a = args; | |
37209 | + *a->errp = xino_fread(a->func, a->file, a->buf, a->size, a->pos); | |
37210 | +} | |
37211 | + | |
37212 | +static ssize_t xino_fread_wkq(vfs_readf_t func, struct file *file, void *buf, | |
37213 | + size_t size, loff_t *pos) | |
37214 | +{ | |
37215 | + ssize_t err; | |
37216 | + int wkq_err; | |
37217 | + struct xino_fread_args args = { | |
37218 | + .errp = &err, | |
37219 | + .func = func, | |
37220 | + .file = file, | |
37221 | + .buf = buf, | |
37222 | + .size = size, | |
37223 | + .pos = pos | |
37224 | + }; | |
37225 | + | |
37226 | + wkq_err = au_wkq_wait(call_xino_fread, &args); | |
37227 | + if (unlikely(wkq_err)) | |
37228 | + err = wkq_err; | |
37229 | + | |
37230 | + return err; | |
37231 | +} | |
37232 | + | |
37233 | +static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, | |
37234 | + size_t size, loff_t *pos); | |
37235 | + | |
37236 | +static ssize_t do_xino_fwrite(vfs_writef_t func, struct file *file, void *kbuf, | |
37237 | + size_t size, loff_t *pos) | |
37238 | +{ | |
37239 | + ssize_t err; | |
37240 | + mm_segment_t oldfs; | |
37241 | + union { | |
37242 | + void *k; | |
37243 | + const char __user *u; | |
37244 | + } buf; | |
37245 | + int i; | |
37246 | + const int prevent_endless = 10; | |
37247 | + | |
37248 | + i = 0; | |
37249 | + buf.k = kbuf; | |
37250 | + oldfs = get_fs(); | |
37251 | + set_fs(KERNEL_DS); | |
37252 | + do { | |
37253 | + err = func(file, buf.u, size, pos); | |
37254 | + if (err == -EINTR | |
37255 | + && !au_wkq_test() | |
37256 | + && fatal_signal_pending(current)) { | |
37257 | + set_fs(oldfs); | |
37258 | + err = xino_fwrite_wkq(func, file, kbuf, size, pos); | |
37259 | + BUG_ON(err == -EINTR); | |
37260 | + oldfs = get_fs(); | |
37261 | + set_fs(KERNEL_DS); | |
37262 | + } | |
37263 | + } while (i++ < prevent_endless | |
37264 | + && (err == -EAGAIN || err == -EINTR)); | |
37265 | + set_fs(oldfs); | |
37266 | + | |
37267 | +#if 0 /* reserved for future use */ | |
37268 | + if (err > 0) | |
37269 | + fsnotify_modify(file->f_path.dentry); | |
37270 | +#endif | |
37271 | + | |
37272 | + return err; | |
37273 | +} | |
37274 | + | |
37275 | +struct do_xino_fwrite_args { | |
37276 | + ssize_t *errp; | |
37277 | + vfs_writef_t func; | |
37278 | + struct file *file; | |
37279 | + void *buf; | |
37280 | + size_t size; | |
37281 | + loff_t *pos; | |
37282 | +}; | |
37283 | + | |
37284 | +static void call_do_xino_fwrite(void *args) | |
37285 | +{ | |
37286 | + struct do_xino_fwrite_args *a = args; | |
37287 | + *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos); | |
37288 | +} | |
37289 | + | |
37290 | +static ssize_t xino_fwrite_wkq(vfs_writef_t func, struct file *file, void *buf, | |
37291 | + size_t size, loff_t *pos) | |
37292 | +{ | |
37293 | + ssize_t err; | |
37294 | + int wkq_err; | |
37295 | + struct do_xino_fwrite_args args = { | |
37296 | + .errp = &err, | |
37297 | + .func = func, | |
37298 | + .file = file, | |
37299 | + .buf = buf, | |
37300 | + .size = size, | |
37301 | + .pos = pos | |
37302 | + }; | |
37303 | + | |
37304 | + /* | |
37305 | + * it breaks RLIMIT_FSIZE and normal user's limit, | |
37306 | + * users should care about quota and real 'filesystem full.' | |
37307 | + */ | |
37308 | + wkq_err = au_wkq_wait(call_do_xino_fwrite, &args); | |
37309 | + if (unlikely(wkq_err)) | |
37310 | + err = wkq_err; | |
37311 | + | |
37312 | + return err; | |
37313 | +} | |
37314 | + | |
37315 | +ssize_t xino_fwrite(vfs_writef_t func, struct file *file, void *buf, | |
37316 | + size_t size, loff_t *pos) | |
37317 | +{ | |
37318 | + ssize_t err; | |
37319 | + | |
37320 | + if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) { | |
37321 | + lockdep_off(); | |
37322 | + err = do_xino_fwrite(func, file, buf, size, pos); | |
37323 | + lockdep_on(); | |
37324 | + } else { | |
37325 | + lockdep_off(); | |
37326 | + err = xino_fwrite_wkq(func, file, buf, size, pos); | |
37327 | + lockdep_on(); | |
37328 | + } | |
37329 | + | |
37330 | + return err; | |
37331 | +} | |
37332 | + | |
37333 | +/* ---------------------------------------------------------------------- */ | |
37334 | + | |
37335 | +/* | |
37336 | + * inode number bitmap | |
37337 | + */ | |
1facf9fc | 37338 | +static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE; |
37339 | +static ino_t xib_calc_ino(unsigned long pindex, int bit) | |
37340 | +{ | |
37341 | + ino_t ino; | |
37342 | + | |
37343 | + AuDebugOn(bit < 0 || page_bits <= bit); | |
37344 | + ino = AUFS_FIRST_INO + pindex * page_bits + bit; | |
37345 | + return ino; | |
37346 | +} | |
37347 | + | |
37348 | +static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit) | |
37349 | +{ | |
37350 | + AuDebugOn(ino < AUFS_FIRST_INO); | |
37351 | + ino -= AUFS_FIRST_INO; | |
37352 | + *pindex = ino / page_bits; | |
37353 | + *bit = ino % page_bits; | |
37354 | +} | |
37355 | + | |
37356 | +static int xib_pindex(struct super_block *sb, unsigned long pindex) | |
37357 | +{ | |
37358 | + int err; | |
37359 | + loff_t pos; | |
37360 | + ssize_t sz; | |
37361 | + struct au_sbinfo *sbinfo; | |
37362 | + struct file *xib; | |
37363 | + unsigned long *p; | |
37364 | + | |
37365 | + sbinfo = au_sbi(sb); | |
37366 | + MtxMustLock(&sbinfo->si_xib_mtx); | |
37367 | + AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE | |
37368 | + || !au_opt_test(sbinfo->si_mntflags, XINO)); | |
37369 | + | |
37370 | + if (pindex == sbinfo->si_xib_last_pindex) | |
37371 | + return 0; | |
37372 | + | |
37373 | + xib = sbinfo->si_xib; | |
37374 | + p = sbinfo->si_xib_buf; | |
37375 | + pos = sbinfo->si_xib_last_pindex; | |
37376 | + pos *= PAGE_SIZE; | |
37377 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
37378 | + if (unlikely(sz != PAGE_SIZE)) | |
37379 | + goto out; | |
37380 | + | |
37381 | + pos = pindex; | |
37382 | + pos *= PAGE_SIZE; | |
c06a8ce3 | 37383 | + if (vfsub_f_size_read(xib) >= pos + PAGE_SIZE) |
1facf9fc | 37384 | + sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos); |
37385 | + else { | |
37386 | + memset(p, 0, PAGE_SIZE); | |
37387 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
37388 | + } | |
37389 | + if (sz == PAGE_SIZE) { | |
37390 | + sbinfo->si_xib_last_pindex = pindex; | |
37391 | + return 0; /* success */ | |
37392 | + } | |
37393 | + | |
4f0767ce | 37394 | +out: |
b752ccd1 AM |
37395 | + AuIOErr1("write failed (%zd)\n", sz); |
37396 | + err = sz; | |
37397 | + if (sz >= 0) | |
37398 | + err = -EIO; | |
37399 | + return err; | |
37400 | +} | |
37401 | + | |
b752ccd1 AM |
37402 | +static void au_xib_clear_bit(struct inode *inode) |
37403 | +{ | |
37404 | + int err, bit; | |
37405 | + unsigned long pindex; | |
37406 | + struct super_block *sb; | |
37407 | + struct au_sbinfo *sbinfo; | |
37408 | + | |
37409 | + AuDebugOn(inode->i_nlink); | |
37410 | + | |
37411 | + sb = inode->i_sb; | |
37412 | + xib_calc_bit(inode->i_ino, &pindex, &bit); | |
37413 | + AuDebugOn(page_bits <= bit); | |
37414 | + sbinfo = au_sbi(sb); | |
37415 | + mutex_lock(&sbinfo->si_xib_mtx); | |
37416 | + err = xib_pindex(sb, pindex); | |
37417 | + if (!err) { | |
37418 | + clear_bit(bit, sbinfo->si_xib_buf); | |
37419 | + sbinfo->si_xib_next_bit = bit; | |
37420 | + } | |
37421 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
37422 | +} | |
37423 | + | |
1facf9fc | 37424 | +/* ---------------------------------------------------------------------- */ |
37425 | + | |
1facf9fc | 37426 | +/* |
062440b3 | 37427 | + * truncate a xino bitmap file |
1facf9fc | 37428 | + */ |
1facf9fc | 37429 | + |
37430 | +/* todo: slow */ | |
37431 | +static int do_xib_restore(struct super_block *sb, struct file *file, void *page) | |
37432 | +{ | |
37433 | + int err, bit; | |
37434 | + ssize_t sz; | |
37435 | + unsigned long pindex; | |
37436 | + loff_t pos, pend; | |
37437 | + struct au_sbinfo *sbinfo; | |
5527c038 | 37438 | + vfs_readf_t func; |
1facf9fc | 37439 | + ino_t *ino; |
37440 | + unsigned long *p; | |
37441 | + | |
37442 | + err = 0; | |
37443 | + sbinfo = au_sbi(sb); | |
dece6358 | 37444 | + MtxMustLock(&sbinfo->si_xib_mtx); |
1facf9fc | 37445 | + p = sbinfo->si_xib_buf; |
37446 | + func = sbinfo->si_xread; | |
c06a8ce3 | 37447 | + pend = vfsub_f_size_read(file); |
1facf9fc | 37448 | + pos = 0; |
37449 | + while (pos < pend) { | |
37450 | + sz = xino_fread(func, file, page, PAGE_SIZE, &pos); | |
37451 | + err = sz; | |
37452 | + if (unlikely(sz <= 0)) | |
37453 | + goto out; | |
37454 | + | |
37455 | + err = 0; | |
37456 | + for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) { | |
37457 | + if (unlikely(*ino < AUFS_FIRST_INO)) | |
37458 | + continue; | |
37459 | + | |
37460 | + xib_calc_bit(*ino, &pindex, &bit); | |
37461 | + AuDebugOn(page_bits <= bit); | |
37462 | + err = xib_pindex(sb, pindex); | |
37463 | + if (!err) | |
37464 | + set_bit(bit, p); | |
37465 | + else | |
37466 | + goto out; | |
37467 | + } | |
37468 | + } | |
37469 | + | |
4f0767ce | 37470 | +out: |
1facf9fc | 37471 | + return err; |
37472 | +} | |
37473 | + | |
37474 | +static int xib_restore(struct super_block *sb) | |
37475 | +{ | |
37476 | + int err; | |
5afbbe0d | 37477 | + aufs_bindex_t bindex, bbot; |
1facf9fc | 37478 | + void *page; |
062440b3 | 37479 | + struct au_branch *br; |
1facf9fc | 37480 | + |
37481 | + err = -ENOMEM; | |
37482 | + page = (void *)__get_free_page(GFP_NOFS); | |
37483 | + if (unlikely(!page)) | |
37484 | + goto out; | |
37485 | + | |
37486 | + err = 0; | |
5afbbe0d AM |
37487 | + bbot = au_sbbot(sb); |
37488 | + for (bindex = 0; !err && bindex <= bbot; bindex++) | |
062440b3 AM |
37489 | + if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0) { |
37490 | + br = au_sbr(sb, bindex); | |
37491 | + err = do_xib_restore(sb, au_xino_file(br), page); | |
37492 | + } else | |
37493 | + AuDbg("skip shared b%d\n", bindex); | |
1c60b727 | 37494 | + free_page((unsigned long)page); |
1facf9fc | 37495 | + |
4f0767ce | 37496 | +out: |
1facf9fc | 37497 | + return err; |
37498 | +} | |
37499 | + | |
37500 | +int au_xib_trunc(struct super_block *sb) | |
37501 | +{ | |
37502 | + int err; | |
37503 | + ssize_t sz; | |
37504 | + loff_t pos; | |
1facf9fc | 37505 | + struct au_sbinfo *sbinfo; |
37506 | + unsigned long *p; | |
37507 | + struct file *file; | |
37508 | + | |
dece6358 AM |
37509 | + SiMustWriteLock(sb); |
37510 | + | |
1facf9fc | 37511 | + err = 0; |
37512 | + sbinfo = au_sbi(sb); | |
37513 | + if (!au_opt_test(sbinfo->si_mntflags, XINO)) | |
37514 | + goto out; | |
37515 | + | |
37516 | + file = sbinfo->si_xib; | |
c06a8ce3 | 37517 | + if (vfsub_f_size_read(file) <= PAGE_SIZE) |
1facf9fc | 37518 | + goto out; |
37519 | + | |
062440b3 | 37520 | + file = au_xino_create2(sb, &sbinfo->si_xib->f_path, NULL); |
1facf9fc | 37521 | + err = PTR_ERR(file); |
37522 | + if (IS_ERR(file)) | |
37523 | + goto out; | |
37524 | + fput(sbinfo->si_xib); | |
37525 | + sbinfo->si_xib = file; | |
37526 | + | |
37527 | + p = sbinfo->si_xib_buf; | |
37528 | + memset(p, 0, PAGE_SIZE); | |
37529 | + pos = 0; | |
37530 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos); | |
37531 | + if (unlikely(sz != PAGE_SIZE)) { | |
37532 | + err = sz; | |
37533 | + AuIOErr("err %d\n", err); | |
37534 | + if (sz >= 0) | |
37535 | + err = -EIO; | |
37536 | + goto out; | |
37537 | + } | |
37538 | + | |
37539 | + mutex_lock(&sbinfo->si_xib_mtx); | |
37540 | + /* mnt_want_write() is unnecessary here */ | |
37541 | + err = xib_restore(sb); | |
37542 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
37543 | + | |
37544 | +out: | |
37545 | + return err; | |
37546 | +} | |
37547 | + | |
37548 | +/* ---------------------------------------------------------------------- */ | |
37549 | + | |
062440b3 AM |
37550 | +struct au_xino *au_xino_alloc(void) |
37551 | +{ | |
37552 | + struct au_xino *xi; | |
37553 | + | |
37554 | + xi = kzalloc(sizeof(*xi), GFP_NOFS); | |
37555 | + if (unlikely(!xi)) | |
37556 | + goto out; | |
37557 | + | |
37558 | + xi->xi_nondir.total = 8; /* initial size */ | |
37559 | + xi->xi_nondir.array = kcalloc(xi->xi_nondir.total, sizeof(ino_t), | |
37560 | + GFP_NOFS); | |
37561 | + if (unlikely(!xi->xi_nondir.array)) | |
37562 | + goto out_free; | |
37563 | + | |
37564 | + spin_lock_init(&xi->xi_nondir.spin); | |
37565 | + init_waitqueue_head(&xi->xi_nondir.wqh); | |
37566 | + atomic_set(&xi->xi_truncating, 0); | |
37567 | + kref_init(&xi->xi_kref); | |
37568 | + goto out; /* success */ | |
37569 | + | |
37570 | +out_free: | |
37571 | + kfree(xi); | |
37572 | + xi = NULL; | |
37573 | +out: | |
37574 | + return xi; | |
37575 | +} | |
37576 | + | |
37577 | +static int au_xino_init(struct au_branch *br, struct file *file) | |
37578 | +{ | |
37579 | + int err; | |
37580 | + struct au_xino *xi; | |
37581 | + | |
37582 | + err = 0; | |
37583 | + xi = au_xino_alloc(); | |
37584 | + if (unlikely(!xi)) { | |
37585 | + err = -ENOMEM; | |
37586 | + goto out; | |
37587 | + } | |
37588 | + | |
37589 | + get_file(file); | |
37590 | + xi->xi_file = file; | |
37591 | + AuDebugOn(br->br_xino); | |
37592 | + br->br_xino = xi; | |
37593 | + | |
37594 | +out: | |
37595 | + return err; | |
37596 | +} | |
37597 | + | |
37598 | +static void au_xino_release(struct kref *kref) | |
37599 | +{ | |
37600 | + struct au_xino *xi; | |
37601 | + int i; | |
37602 | + | |
37603 | + xi = container_of(kref, struct au_xino, xi_kref); | |
37604 | + if (xi->xi_file) | |
37605 | + fput(xi->xi_file); | |
37606 | + for (i = xi->xi_nondir.total - 1; i >= 0; i--) | |
37607 | + AuDebugOn(xi->xi_nondir.array[i]); | |
37608 | + kfree(xi->xi_nondir.array); | |
37609 | + kfree(xi); | |
37610 | +} | |
37611 | + | |
37612 | +int au_xino_put(struct au_branch *br) | |
37613 | +{ | |
37614 | + int ret; | |
37615 | + struct au_xino *xi; | |
37616 | + | |
37617 | + ret = 0; | |
37618 | + xi = br->br_xino; | |
37619 | + if (xi) { | |
37620 | + br->br_xino = NULL; | |
37621 | + ret = kref_put(&xi->xi_kref, au_xino_release); | |
37622 | + } | |
37623 | + | |
37624 | + return ret; | |
37625 | +} | |
37626 | + | |
37627 | +void au_xino_file_set(struct au_branch *br, struct file *file) | |
37628 | +{ | |
37629 | + struct au_xino *xi; | |
37630 | + struct file *f; | |
37631 | + | |
37632 | + if (file) | |
37633 | + get_file(file); | |
37634 | + xi = br->br_xino; | |
37635 | + AuDebugOn(!xi); | |
37636 | + f = xi->xi_file; | |
37637 | + if (f) | |
37638 | + fput(f); | |
37639 | + xi->xi_file = file; | |
37640 | +} | |
37641 | + | |
37642 | +/* ---------------------------------------------------------------------- */ | |
37643 | + | |
1facf9fc | 37644 | +/* |
37645 | + * xino mount option handlers | |
37646 | + */ | |
1facf9fc | 37647 | + |
37648 | +/* xino bitmap */ | |
37649 | +static void xino_clear_xib(struct super_block *sb) | |
37650 | +{ | |
37651 | + struct au_sbinfo *sbinfo; | |
37652 | + | |
dece6358 AM |
37653 | + SiMustWriteLock(sb); |
37654 | + | |
1facf9fc | 37655 | + sbinfo = au_sbi(sb); |
062440b3 | 37656 | + /* unnecessary to clear sbinfo->si_xread and ->si_xwrite */ |
1facf9fc | 37657 | + if (sbinfo->si_xib) |
37658 | + fput(sbinfo->si_xib); | |
37659 | + sbinfo->si_xib = NULL; | |
f0c0a007 | 37660 | + if (sbinfo->si_xib_buf) |
1c60b727 | 37661 | + free_page((unsigned long)sbinfo->si_xib_buf); |
1facf9fc | 37662 | + sbinfo->si_xib_buf = NULL; |
37663 | +} | |
37664 | + | |
062440b3 | 37665 | +static int au_xino_set_xib(struct super_block *sb, struct path *path) |
1facf9fc | 37666 | +{ |
37667 | + int err; | |
37668 | + loff_t pos; | |
37669 | + struct au_sbinfo *sbinfo; | |
37670 | + struct file *file; | |
37671 | + | |
dece6358 AM |
37672 | + SiMustWriteLock(sb); |
37673 | + | |
1facf9fc | 37674 | + sbinfo = au_sbi(sb); |
062440b3 | 37675 | + file = au_xino_create2(sb, path, sbinfo->si_xib); |
1facf9fc | 37676 | + err = PTR_ERR(file); |
37677 | + if (IS_ERR(file)) | |
37678 | + goto out; | |
37679 | + if (sbinfo->si_xib) | |
37680 | + fput(sbinfo->si_xib); | |
37681 | + sbinfo->si_xib = file; | |
5527c038 JR |
37682 | + sbinfo->si_xread = vfs_readf(file); |
37683 | + sbinfo->si_xwrite = vfs_writef(file); | |
1facf9fc | 37684 | + |
37685 | + err = -ENOMEM; | |
37686 | + if (!sbinfo->si_xib_buf) | |
37687 | + sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS); | |
37688 | + if (unlikely(!sbinfo->si_xib_buf)) | |
37689 | + goto out_unset; | |
37690 | + | |
37691 | + sbinfo->si_xib_last_pindex = 0; | |
37692 | + sbinfo->si_xib_next_bit = 0; | |
c06a8ce3 | 37693 | + if (vfsub_f_size_read(file) < PAGE_SIZE) { |
1facf9fc | 37694 | + pos = 0; |
37695 | + err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf, | |
37696 | + PAGE_SIZE, &pos); | |
37697 | + if (unlikely(err != PAGE_SIZE)) | |
37698 | + goto out_free; | |
37699 | + } | |
37700 | + err = 0; | |
37701 | + goto out; /* success */ | |
37702 | + | |
4f0767ce | 37703 | +out_free: |
f0c0a007 | 37704 | + if (sbinfo->si_xib_buf) |
1c60b727 | 37705 | + free_page((unsigned long)sbinfo->si_xib_buf); |
b752ccd1 AM |
37706 | + sbinfo->si_xib_buf = NULL; |
37707 | + if (err >= 0) | |
37708 | + err = -EIO; | |
4f0767ce | 37709 | +out_unset: |
b752ccd1 AM |
37710 | + fput(sbinfo->si_xib); |
37711 | + sbinfo->si_xib = NULL; | |
4f0767ce | 37712 | +out: |
062440b3 | 37713 | + AuTraceErr(err); |
b752ccd1 | 37714 | + return err; |
1facf9fc | 37715 | +} |
37716 | + | |
b752ccd1 AM |
37717 | +/* xino for each branch */ |
37718 | +static void xino_clear_br(struct super_block *sb) | |
37719 | +{ | |
5afbbe0d | 37720 | + aufs_bindex_t bindex, bbot; |
b752ccd1 | 37721 | + struct au_branch *br; |
1facf9fc | 37722 | + |
5afbbe0d AM |
37723 | + bbot = au_sbbot(sb); |
37724 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
b752ccd1 | 37725 | + br = au_sbr(sb, bindex); |
062440b3 AM |
37726 | + AuDebugOn(!br); |
37727 | + au_xino_put(br); | |
37728 | + } | |
37729 | +} | |
37730 | + | |
37731 | +static void au_xino_set_br_shared(struct super_block *sb, struct au_branch *br, | |
37732 | + aufs_bindex_t bshared) | |
37733 | +{ | |
37734 | + struct au_branch *brshared; | |
b752ccd1 | 37735 | + |
062440b3 AM |
37736 | + brshared = au_sbr(sb, bshared); |
37737 | + AuDebugOn(!brshared->br_xino); | |
37738 | + AuDebugOn(!brshared->br_xino->xi_file); | |
37739 | + if (br->br_xino != brshared->br_xino) { | |
37740 | + au_xino_get(brshared); | |
37741 | + au_xino_put(br); | |
37742 | + br->br_xino = brshared->br_xino; | |
b752ccd1 AM |
37743 | + } |
37744 | +} | |
37745 | + | |
062440b3 AM |
37746 | +struct au_xino_do_set_br { |
37747 | + vfs_writef_t writef; | |
37748 | + struct au_branch *br; | |
37749 | + ino_t h_ino; | |
37750 | + aufs_bindex_t bshared; | |
37751 | +}; | |
37752 | + | |
37753 | +static int au_xino_do_set_br(struct super_block *sb, struct path *path, | |
37754 | + struct au_xino_do_set_br *args) | |
1facf9fc | 37755 | +{ |
37756 | + int err; | |
062440b3 AM |
37757 | + struct file *file; |
37758 | + | |
37759 | + if (args->bshared >= 0) { | |
37760 | + /* shared xino */ | |
37761 | + au_xino_set_br_shared(sb, args->br, args->bshared); | |
37762 | + file = au_xino_file(args->br); | |
37763 | + goto out_ino; /* success */ | |
37764 | + } | |
37765 | + | |
37766 | + /* new xino */ | |
37767 | + file = au_xino_create2(sb, path, au_xino_file(args->br)); | |
37768 | + err = PTR_ERR(file); | |
37769 | + if (IS_ERR(file)) | |
37770 | + goto out; | |
37771 | + if (!args->br->br_xino) { | |
37772 | + err = au_xino_init(args->br, file); | |
37773 | + fput(file); | |
37774 | + if (unlikely(err)) | |
37775 | + goto out; | |
37776 | + } else { | |
37777 | + au_xino_file_set(args->br, file); | |
37778 | + fput(file); | |
37779 | + } | |
37780 | + | |
37781 | +out_ino: | |
37782 | + err = au_xino_do_write(args->writef, file, args->h_ino, AUFS_ROOT_INO); | |
37783 | +out: | |
37784 | + AuTraceErr(err); | |
37785 | + return err; | |
37786 | +} | |
37787 | + | |
37788 | +static int au_xino_set_br(struct super_block *sb, struct path *path) | |
37789 | +{ | |
37790 | + int err; | |
37791 | + aufs_bindex_t bindex, bbot; | |
37792 | + struct au_xino_do_set_br args; | |
b752ccd1 | 37793 | + struct inode *inode; |
1facf9fc | 37794 | + |
b752ccd1 AM |
37795 | + SiMustWriteLock(sb); |
37796 | + | |
5afbbe0d | 37797 | + bbot = au_sbbot(sb); |
5527c038 | 37798 | + inode = d_inode(sb->s_root); |
062440b3 AM |
37799 | + args.writef = au_sbi(sb)->si_xwrite; |
37800 | + for (bindex = 0; bindex <= bbot; bindex++) { | |
37801 | + args.h_ino = au_h_iptr(inode, bindex)->i_ino; | |
37802 | + args.br = au_sbr(sb, bindex); | |
37803 | + args.bshared = is_sb_shared(sb, bindex, bindex - 1); | |
37804 | + err = au_xino_do_set_br(sb, path, &args); | |
b752ccd1 | 37805 | + if (unlikely(err)) |
062440b3 | 37806 | + break; |
b752ccd1 | 37807 | + } |
1facf9fc | 37808 | + |
062440b3 | 37809 | + AuTraceErr(err); |
1facf9fc | 37810 | + return err; |
37811 | +} | |
b752ccd1 AM |
37812 | + |
37813 | +void au_xino_clr(struct super_block *sb) | |
37814 | +{ | |
37815 | + struct au_sbinfo *sbinfo; | |
37816 | + | |
37817 | + au_xigen_clr(sb); | |
37818 | + xino_clear_xib(sb); | |
37819 | + xino_clear_br(sb); | |
062440b3 AM |
37820 | + dbgaufs_brs_del(sb, 0); |
37821 | + au_xino_brid_set(sb, -1); | |
b752ccd1 AM |
37822 | + sbinfo = au_sbi(sb); |
37823 | + /* lvalue, do not call au_mntflags() */ | |
37824 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
37825 | +} | |
37826 | + | |
062440b3 | 37827 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xiopt, int remount) |
b752ccd1 AM |
37828 | +{ |
37829 | + int err, skip; | |
062440b3 | 37830 | + struct dentry *dentry, *parent, *cur_dentry, *cur_parent; |
b752ccd1 AM |
37831 | + struct qstr *dname, *cur_name; |
37832 | + struct file *cur_xino; | |
b752ccd1 | 37833 | + struct au_sbinfo *sbinfo; |
062440b3 | 37834 | + struct path *path, *cur_path; |
b752ccd1 AM |
37835 | + |
37836 | + SiMustWriteLock(sb); | |
37837 | + | |
37838 | + err = 0; | |
37839 | + sbinfo = au_sbi(sb); | |
062440b3 AM |
37840 | + path = &xiopt->file->f_path; |
37841 | + dentry = path->dentry; | |
37842 | + parent = dget_parent(dentry); | |
b752ccd1 AM |
37843 | + if (remount) { |
37844 | + skip = 0; | |
b752ccd1 AM |
37845 | + cur_xino = sbinfo->si_xib; |
37846 | + if (cur_xino) { | |
062440b3 AM |
37847 | + cur_path = &cur_xino->f_path; |
37848 | + cur_dentry = cur_path->dentry; | |
37849 | + cur_parent = dget_parent(cur_dentry); | |
37850 | + cur_name = &cur_dentry->d_name; | |
37851 | + dname = &dentry->d_name; | |
b752ccd1 | 37852 | + skip = (cur_parent == parent |
38d290e6 | 37853 | + && au_qstreq(dname, cur_name)); |
b752ccd1 AM |
37854 | + dput(cur_parent); |
37855 | + } | |
37856 | + if (skip) | |
37857 | + goto out; | |
37858 | + } | |
37859 | + | |
37860 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
062440b3 AM |
37861 | + err = au_xino_set_xib(sb, path); |
37862 | + /* si_x{read,write} are set */ | |
b752ccd1 | 37863 | + if (!err) |
062440b3 | 37864 | + err = au_xigen_set(sb, path); |
b752ccd1 | 37865 | + if (!err) |
062440b3 AM |
37866 | + err = au_xino_set_br(sb, path); |
37867 | + if (!err) { | |
37868 | + dbgaufs_brs_add(sb, 0, /*topdown*/1); | |
b752ccd1 | 37869 | + goto out; /* success */ |
062440b3 | 37870 | + } |
b752ccd1 AM |
37871 | + |
37872 | + /* reset all */ | |
062440b3 AM |
37873 | + AuIOErr("failed setting xino(%d).\n", err); |
37874 | + au_xino_clr(sb); | |
b752ccd1 | 37875 | + |
4f0767ce | 37876 | +out: |
b752ccd1 AM |
37877 | + dput(parent); |
37878 | + return err; | |
37879 | +} | |
37880 | + | |
b752ccd1 AM |
37881 | +/* |
37882 | + * create a xinofile at the default place/path. | |
37883 | + */ | |
37884 | +struct file *au_xino_def(struct super_block *sb) | |
37885 | +{ | |
37886 | + struct file *file; | |
37887 | + char *page, *p; | |
37888 | + struct au_branch *br; | |
37889 | + struct super_block *h_sb; | |
37890 | + struct path path; | |
5afbbe0d | 37891 | + aufs_bindex_t bbot, bindex, bwr; |
b752ccd1 AM |
37892 | + |
37893 | + br = NULL; | |
5afbbe0d | 37894 | + bbot = au_sbbot(sb); |
b752ccd1 | 37895 | + bwr = -1; |
5afbbe0d | 37896 | + for (bindex = 0; bindex <= bbot; bindex++) { |
b752ccd1 AM |
37897 | + br = au_sbr(sb, bindex); |
37898 | + if (au_br_writable(br->br_perm) | |
86dc4139 | 37899 | + && !au_test_fs_bad_xino(au_br_sb(br))) { |
b752ccd1 AM |
37900 | + bwr = bindex; |
37901 | + break; | |
37902 | + } | |
37903 | + } | |
37904 | + | |
7f207e10 AM |
37905 | + if (bwr >= 0) { |
37906 | + file = ERR_PTR(-ENOMEM); | |
537831f9 | 37907 | + page = (void *)__get_free_page(GFP_NOFS); |
7f207e10 AM |
37908 | + if (unlikely(!page)) |
37909 | + goto out; | |
86dc4139 | 37910 | + path.mnt = au_br_mnt(br); |
7f207e10 AM |
37911 | + path.dentry = au_h_dptr(sb->s_root, bwr); |
37912 | + p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME)); | |
37913 | + file = (void *)p; | |
37914 | + if (!IS_ERR(p)) { | |
37915 | + strcat(p, "/" AUFS_XINO_FNAME); | |
37916 | + AuDbg("%s\n", p); | |
37917 | + file = au_xino_create(sb, p, /*silent*/0); | |
37918 | + if (!IS_ERR(file)) | |
37919 | + au_xino_brid_set(sb, br->br_id); | |
37920 | + } | |
1c60b727 | 37921 | + free_page((unsigned long)page); |
7f207e10 AM |
37922 | + } else { |
37923 | + file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0); | |
37924 | + if (IS_ERR(file)) | |
37925 | + goto out; | |
2000de60 | 37926 | + h_sb = file->f_path.dentry->d_sb; |
7f207e10 AM |
37927 | + if (unlikely(au_test_fs_bad_xino(h_sb))) { |
37928 | + pr_err("xino doesn't support %s(%s)\n", | |
37929 | + AUFS_XINO_DEFPATH, au_sbtype(h_sb)); | |
37930 | + fput(file); | |
37931 | + file = ERR_PTR(-EINVAL); | |
37932 | + } | |
37933 | + if (!IS_ERR(file)) | |
37934 | + au_xino_brid_set(sb, -1); | |
37935 | + } | |
0c5527e5 | 37936 | + |
7f207e10 AM |
37937 | +out: |
37938 | + return file; | |
37939 | +} | |
37940 | + | |
37941 | +/* ---------------------------------------------------------------------- */ | |
37942 | + | |
062440b3 AM |
37943 | +/* |
37944 | + * initialize the xinofile for the specified branch @br | |
37945 | + * at the place/path where @base_file indicates. | |
37946 | + * test whether another branch is on the same filesystem or not, | |
37947 | + * if found then share the xinofile with another branch. | |
37948 | + */ | |
37949 | +int au_xino_init_br(struct super_block *sb, struct au_branch *br, ino_t h_ino, | |
37950 | + struct path *base) | |
7f207e10 AM |
37951 | +{ |
37952 | + int err; | |
062440b3 AM |
37953 | + struct au_xino_do_set_br args = { |
37954 | + .h_ino = h_ino, | |
37955 | + .br = br | |
37956 | + }; | |
7f207e10 | 37957 | + |
062440b3 AM |
37958 | + args.writef = au_sbi(sb)->si_xwrite; |
37959 | + args.bshared = sbr_find_shared(sb, /*btop*/0, au_sbbot(sb), | |
37960 | + au_br_sb(br)); | |
37961 | + err = au_xino_do_set_br(sb, base, &args); | |
79b8bda9 | 37962 | + if (unlikely(err)) |
062440b3 | 37963 | + au_xino_put(br); |
7f207e10 | 37964 | + |
7f207e10 AM |
37965 | + return err; |
37966 | +} | |
521ced18 JR |
37967 | + |
37968 | +/* ---------------------------------------------------------------------- */ | |
37969 | + | |
062440b3 AM |
37970 | +/* |
37971 | + * get an unused inode number from bitmap | |
37972 | + */ | |
37973 | +ino_t au_xino_new_ino(struct super_block *sb) | |
37974 | +{ | |
37975 | + ino_t ino; | |
37976 | + unsigned long *p, pindex, ul, pend; | |
37977 | + struct au_sbinfo *sbinfo; | |
37978 | + struct file *file; | |
37979 | + int free_bit, err; | |
37980 | + | |
37981 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
37982 | + return iunique(sb, AUFS_FIRST_INO); | |
37983 | + | |
37984 | + sbinfo = au_sbi(sb); | |
37985 | + mutex_lock(&sbinfo->si_xib_mtx); | |
37986 | + p = sbinfo->si_xib_buf; | |
37987 | + free_bit = sbinfo->si_xib_next_bit; | |
37988 | + if (free_bit < page_bits && !test_bit(free_bit, p)) | |
37989 | + goto out; /* success */ | |
37990 | + free_bit = find_first_zero_bit(p, page_bits); | |
37991 | + if (free_bit < page_bits) | |
37992 | + goto out; /* success */ | |
37993 | + | |
37994 | + pindex = sbinfo->si_xib_last_pindex; | |
37995 | + for (ul = pindex - 1; ul < ULONG_MAX; ul--) { | |
37996 | + err = xib_pindex(sb, ul); | |
37997 | + if (unlikely(err)) | |
37998 | + goto out_err; | |
37999 | + free_bit = find_first_zero_bit(p, page_bits); | |
38000 | + if (free_bit < page_bits) | |
38001 | + goto out; /* success */ | |
38002 | + } | |
38003 | + | |
38004 | + file = sbinfo->si_xib; | |
38005 | + pend = vfsub_f_size_read(file) / PAGE_SIZE; | |
38006 | + for (ul = pindex + 1; ul <= pend; ul++) { | |
38007 | + err = xib_pindex(sb, ul); | |
38008 | + if (unlikely(err)) | |
38009 | + goto out_err; | |
38010 | + free_bit = find_first_zero_bit(p, page_bits); | |
38011 | + if (free_bit < page_bits) | |
38012 | + goto out; /* success */ | |
38013 | + } | |
38014 | + BUG(); | |
38015 | + | |
38016 | +out: | |
38017 | + set_bit(free_bit, p); | |
38018 | + sbinfo->si_xib_next_bit = free_bit + 1; | |
38019 | + pindex = sbinfo->si_xib_last_pindex; | |
38020 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
38021 | + ino = xib_calc_ino(pindex, free_bit); | |
38022 | + AuDbg("i%lu\n", (unsigned long)ino); | |
38023 | + return ino; | |
38024 | +out_err: | |
38025 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
38026 | + AuDbg("i0\n"); | |
38027 | + return 0; | |
38028 | +} | |
38029 | + | |
38030 | +/* for s_op->delete_inode() */ | |
38031 | +void au_xino_delete_inode(struct inode *inode, const int unlinked) | |
521ced18 | 38032 | +{ |
062440b3 AM |
38033 | + int err; |
38034 | + unsigned int mnt_flags; | |
38035 | + aufs_bindex_t bindex, bbot, bi; | |
38036 | + unsigned char try_trunc; | |
38037 | + struct au_iinfo *iinfo; | |
38038 | + struct super_block *sb; | |
38039 | + struct au_hinode *hi; | |
38040 | + struct inode *h_inode; | |
38041 | + struct au_branch *br; | |
38042 | + vfs_writef_t xwrite; | |
521ced18 | 38043 | + |
062440b3 | 38044 | + AuDebugOn(au_is_bad_inode(inode)); |
521ced18 | 38045 | + |
062440b3 AM |
38046 | + sb = inode->i_sb; |
38047 | + mnt_flags = au_mntflags(sb); | |
38048 | + if (!au_opt_test(mnt_flags, XINO) | |
38049 | + || inode->i_ino == AUFS_ROOT_INO) | |
38050 | + return; | |
38051 | + | |
38052 | + if (unlinked) { | |
38053 | + au_xigen_inc(inode); | |
38054 | + au_xib_clear_bit(inode); | |
38055 | + } | |
38056 | + | |
38057 | + iinfo = au_ii(inode); | |
38058 | + bindex = iinfo->ii_btop; | |
38059 | + if (bindex < 0) | |
38060 | + return; | |
38061 | + | |
38062 | + xwrite = au_sbi(sb)->si_xwrite; | |
38063 | + try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO); | |
38064 | + hi = au_hinode(iinfo, bindex); | |
38065 | + bbot = iinfo->ii_bbot; | |
38066 | + for (; bindex <= bbot; bindex++, hi++) { | |
38067 | + h_inode = hi->hi_inode; | |
38068 | + if (!h_inode | |
38069 | + || (!unlinked && h_inode->i_nlink)) | |
38070 | + continue; | |
38071 | + | |
38072 | + /* inode may not be revalidated */ | |
38073 | + bi = au_br_index(sb, hi->hi_id); | |
38074 | + if (bi < 0) | |
38075 | + continue; | |
38076 | + | |
38077 | + br = au_sbr(sb, bi); | |
38078 | + err = au_xino_do_write(xwrite, au_xino_file(br), | |
38079 | + h_inode->i_ino, /*ino*/0); | |
38080 | + if (!err && try_trunc | |
38081 | + && au_test_fs_trunc_xino(au_br_sb(br))) | |
38082 | + xino_try_trunc(sb, br); | |
38083 | + } | |
521ced18 JR |
38084 | +} |
38085 | + | |
062440b3 AM |
38086 | +/* ---------------------------------------------------------------------- */ |
38087 | + | |
38088 | +static int au_xinondir_find(struct au_xino *xi, ino_t h_ino) | |
521ced18 JR |
38089 | +{ |
38090 | + int found, total, i; | |
38091 | + | |
38092 | + found = -1; | |
062440b3 | 38093 | + total = xi->xi_nondir.total; |
521ced18 | 38094 | + for (i = 0; i < total; i++) { |
062440b3 | 38095 | + if (xi->xi_nondir.array[i] != h_ino) |
521ced18 JR |
38096 | + continue; |
38097 | + found = i; | |
38098 | + break; | |
38099 | + } | |
38100 | + | |
38101 | + return found; | |
38102 | +} | |
38103 | + | |
062440b3 | 38104 | +static int au_xinondir_expand(struct au_xino *xi) |
521ced18 JR |
38105 | +{ |
38106 | + int err, sz; | |
38107 | + ino_t *p; | |
38108 | + | |
38109 | + BUILD_BUG_ON(KMALLOC_MAX_SIZE > INT_MAX); | |
38110 | + | |
38111 | + err = -ENOMEM; | |
062440b3 | 38112 | + sz = xi->xi_nondir.total * sizeof(ino_t); |
521ced18 JR |
38113 | + if (unlikely(sz > KMALLOC_MAX_SIZE / 2)) |
38114 | + goto out; | |
062440b3 | 38115 | + p = au_kzrealloc(xi->xi_nondir.array, sz, sz << 1, GFP_ATOMIC, |
521ced18 JR |
38116 | + /*may_shrink*/0); |
38117 | + if (p) { | |
062440b3 AM |
38118 | + xi->xi_nondir.array = p; |
38119 | + xi->xi_nondir.total <<= 1; | |
38120 | + AuDbg("xi_nondir.total %d\n", xi->xi_nondir.total); | |
521ced18 JR |
38121 | + err = 0; |
38122 | + } | |
38123 | + | |
38124 | +out: | |
38125 | + return err; | |
38126 | +} | |
38127 | + | |
062440b3 AM |
38128 | +void au_xinondir_leave(struct super_block *sb, aufs_bindex_t bindex, |
38129 | + ino_t h_ino, int idx) | |
38130 | +{ | |
38131 | + struct au_xino *xi; | |
38132 | + | |
38133 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); | |
38134 | + xi = au_sbr(sb, bindex)->br_xino; | |
38135 | + AuDebugOn(idx < 0 || xi->xi_nondir.total <= idx); | |
38136 | + | |
38137 | + spin_lock(&xi->xi_nondir.spin); | |
38138 | + AuDebugOn(xi->xi_nondir.array[idx] != h_ino); | |
38139 | + xi->xi_nondir.array[idx] = 0; | |
38140 | + spin_unlock(&xi->xi_nondir.spin); | |
38141 | + wake_up_all(&xi->xi_nondir.wqh); | |
38142 | +} | |
38143 | + | |
521ced18 JR |
38144 | +int au_xinondir_enter(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
38145 | + int *idx) | |
38146 | +{ | |
38147 | + int err, found, empty; | |
062440b3 | 38148 | + struct au_xino *xi; |
521ced18 JR |
38149 | + |
38150 | + err = 0; | |
38151 | + *idx = -1; | |
38152 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
38153 | + goto out; /* no xino */ | |
38154 | + | |
062440b3 | 38155 | + xi = au_sbr(sb, bindex)->br_xino; |
521ced18 JR |
38156 | + |
38157 | +again: | |
062440b3 AM |
38158 | + spin_lock(&xi->xi_nondir.spin); |
38159 | + found = au_xinondir_find(xi, h_ino); | |
521ced18 | 38160 | + if (found == -1) { |
062440b3 | 38161 | + empty = au_xinondir_find(xi, /*h_ino*/0); |
521ced18 | 38162 | + if (empty == -1) { |
062440b3 AM |
38163 | + empty = xi->xi_nondir.total; |
38164 | + err = au_xinondir_expand(xi); | |
521ced18 JR |
38165 | + if (unlikely(err)) |
38166 | + goto out_unlock; | |
38167 | + } | |
062440b3 | 38168 | + xi->xi_nondir.array[empty] = h_ino; |
521ced18 JR |
38169 | + *idx = empty; |
38170 | + } else { | |
062440b3 AM |
38171 | + spin_unlock(&xi->xi_nondir.spin); |
38172 | + wait_event(xi->xi_nondir.wqh, | |
38173 | + xi->xi_nondir.array[found] != h_ino); | |
521ced18 JR |
38174 | + goto again; |
38175 | + } | |
38176 | + | |
38177 | +out_unlock: | |
062440b3 AM |
38178 | + spin_unlock(&xi->xi_nondir.spin); |
38179 | +out: | |
38180 | + return err; | |
38181 | +} | |
38182 | + | |
38183 | +/* ---------------------------------------------------------------------- */ | |
38184 | + | |
38185 | +int au_xino_path(struct seq_file *seq, struct file *file) | |
38186 | +{ | |
38187 | + int err; | |
38188 | + | |
38189 | + err = au_seq_path(seq, &file->f_path); | |
38190 | + if (unlikely(err)) | |
38191 | + goto out; | |
38192 | + | |
38193 | +#define Deleted "\\040(deleted)" | |
38194 | + seq->count -= sizeof(Deleted) - 1; | |
38195 | + AuDebugOn(memcmp(seq->buf + seq->count, Deleted, | |
38196 | + sizeof(Deleted) - 1)); | |
38197 | +#undef Deleted | |
38198 | + | |
521ced18 JR |
38199 | +out: |
38200 | + return err; | |
38201 | +} | |
537831f9 AM |
38202 | diff -urN /usr/share/empty/include/uapi/linux/aufs_type.h linux/include/uapi/linux/aufs_type.h |
38203 | --- /usr/share/empty/include/uapi/linux/aufs_type.h 1970-01-01 01:00:00.000000000 +0100 | |
cd7a4cd9 | 38204 | +++ linux/include/uapi/linux/aufs_type.h 2018-08-12 23:43:05.466791610 +0200 |
062440b3 AM |
38205 | @@ -0,0 +1,448 @@ |
38206 | +/* SPDX-License-Identifier: GPL-2.0 */ | |
7f207e10 | 38207 | +/* |
b00004a5 | 38208 | + * Copyright (C) 2005-2018 Junjiro R. Okajima |
7f207e10 AM |
38209 | + * |
38210 | + * This program, aufs is free software; you can redistribute it and/or modify | |
38211 | + * it under the terms of the GNU General Public License as published by | |
38212 | + * the Free Software Foundation; either version 2 of the License, or | |
38213 | + * (at your option) any later version. | |
38214 | + * | |
38215 | + * This program is distributed in the hope that it will be useful, | |
38216 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
38217 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
38218 | + * GNU General Public License for more details. | |
38219 | + * | |
38220 | + * You should have received a copy of the GNU General Public License | |
523b37e3 | 38221 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
7f207e10 AM |
38222 | + */ |
38223 | + | |
38224 | +#ifndef __AUFS_TYPE_H__ | |
38225 | +#define __AUFS_TYPE_H__ | |
38226 | + | |
f6c5ef8b AM |
38227 | +#define AUFS_NAME "aufs" |
38228 | + | |
9dbd164d | 38229 | +#ifdef __KERNEL__ |
f6c5ef8b AM |
38230 | +/* |
38231 | + * define it before including all other headers. | |
38232 | + * sched.h may use pr_* macros before defining "current", so define the | |
38233 | + * no-current version first, and re-define later. | |
38234 | + */ | |
38235 | +#define pr_fmt(fmt) AUFS_NAME " %s:%d: " fmt, __func__, __LINE__ | |
38236 | +#include <linux/sched.h> | |
38237 | +#undef pr_fmt | |
a2a7ad62 AM |
38238 | +#define pr_fmt(fmt) \ |
38239 | + AUFS_NAME " %s:%d:%.*s[%d]: " fmt, __func__, __LINE__, \ | |
38240 | + (int)sizeof(current->comm), current->comm, current->pid | |
9dbd164d AM |
38241 | +#else |
38242 | +#include <stdint.h> | |
38243 | +#include <sys/types.h> | |
f6c5ef8b | 38244 | +#endif /* __KERNEL__ */ |
7f207e10 | 38245 | + |
f6c5ef8b AM |
38246 | +#include <linux/limits.h> |
38247 | + | |
cd7a4cd9 | 38248 | +#define AUFS_VERSION "4.x-rcN-20180730" |
7f207e10 AM |
38249 | + |
38250 | +/* todo? move this to linux-2.6.19/include/magic.h */ | |
38251 | +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') | |
38252 | + | |
38253 | +/* ---------------------------------------------------------------------- */ | |
38254 | + | |
38255 | +#ifdef CONFIG_AUFS_BRANCH_MAX_127 | |
9dbd164d | 38256 | +typedef int8_t aufs_bindex_t; |
7f207e10 AM |
38257 | +#define AUFS_BRANCH_MAX 127 |
38258 | +#else | |
9dbd164d | 38259 | +typedef int16_t aufs_bindex_t; |
7f207e10 AM |
38260 | +#ifdef CONFIG_AUFS_BRANCH_MAX_511 |
38261 | +#define AUFS_BRANCH_MAX 511 | |
38262 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) | |
38263 | +#define AUFS_BRANCH_MAX 1023 | |
38264 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) | |
38265 | +#define AUFS_BRANCH_MAX 32767 | |
38266 | +#endif | |
38267 | +#endif | |
38268 | + | |
38269 | +#ifdef __KERNEL__ | |
38270 | +#ifndef AUFS_BRANCH_MAX | |
38271 | +#error unknown CONFIG_AUFS_BRANCH_MAX value | |
38272 | +#endif | |
38273 | +#endif /* __KERNEL__ */ | |
38274 | + | |
38275 | +/* ---------------------------------------------------------------------- */ | |
38276 | + | |
7f207e10 AM |
38277 | +#define AUFS_FSTYPE AUFS_NAME |
38278 | + | |
38279 | +#define AUFS_ROOT_INO 2 | |
38280 | +#define AUFS_FIRST_INO 11 | |
38281 | + | |
38282 | +#define AUFS_WH_PFX ".wh." | |
38283 | +#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) | |
38284 | +#define AUFS_WH_TMP_LEN 4 | |
86dc4139 | 38285 | +/* a limit for rmdir/rename a dir and copyup */ |
7f207e10 AM |
38286 | +#define AUFS_MAX_NAMELEN (NAME_MAX \ |
38287 | + - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ | |
38288 | + - 1 /* dot */\ | |
38289 | + - AUFS_WH_TMP_LEN) /* hex */ | |
38290 | +#define AUFS_XINO_FNAME "." AUFS_NAME ".xino" | |
38291 | +#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME | |
392086de AM |
38292 | +#define AUFS_XINO_DEF_SEC 30 /* seconds */ |
38293 | +#define AUFS_XINO_DEF_TRUNC 45 /* percentage */ | |
7f207e10 AM |
38294 | +#define AUFS_DIRWH_DEF 3 |
38295 | +#define AUFS_RDCACHE_DEF 10 /* seconds */ | |
027c5e7a | 38296 | +#define AUFS_RDCACHE_MAX 3600 /* seconds */ |
7f207e10 AM |
38297 | +#define AUFS_RDBLK_DEF 512 /* bytes */ |
38298 | +#define AUFS_RDHASH_DEF 32 | |
38299 | +#define AUFS_WKQ_NAME AUFS_NAME "d" | |
027c5e7a AM |
38300 | +#define AUFS_MFS_DEF_SEC 30 /* seconds */ |
38301 | +#define AUFS_MFS_MAX_SEC 3600 /* seconds */ | |
076b876e | 38302 | +#define AUFS_FHSM_CACHE_DEF_SEC 30 /* seconds */ |
86dc4139 | 38303 | +#define AUFS_PLINK_WARN 50 /* number of plinks in a single bucket */ |
7f207e10 AM |
38304 | + |
38305 | +/* pseudo-link maintenace under /proc */ | |
38306 | +#define AUFS_PLINK_MAINT_NAME "plink_maint" | |
38307 | +#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME | |
38308 | +#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME | |
38309 | + | |
8b6a4947 AM |
38310 | +/* dirren, renamed dir */ |
38311 | +#define AUFS_DR_INFO_PFX AUFS_WH_PFX ".dr." | |
38312 | +#define AUFS_DR_BRHINO_NAME AUFS_WH_PFX "hino" | |
38313 | +/* whiteouted doubly */ | |
38314 | +#define AUFS_WH_DR_INFO_PFX AUFS_WH_PFX AUFS_DR_INFO_PFX | |
38315 | +#define AUFS_WH_DR_BRHINO AUFS_WH_PFX AUFS_DR_BRHINO_NAME | |
38316 | + | |
7f207e10 AM |
38317 | +#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ |
38318 | +#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME | |
38319 | + | |
38320 | +#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME | |
38321 | +#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" | |
38322 | +#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" | |
38323 | + | |
38324 | +/* doubly whiteouted */ | |
38325 | +#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME | |
38326 | +#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME | |
38327 | +#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME | |
38328 | + | |
1e00d052 | 38329 | +/* branch permissions and attributes */ |
7f207e10 AM |
38330 | +#define AUFS_BRPERM_RW "rw" |
38331 | +#define AUFS_BRPERM_RO "ro" | |
38332 | +#define AUFS_BRPERM_RR "rr" | |
076b876e AM |
38333 | +#define AUFS_BRATTR_COO_REG "coo_reg" |
38334 | +#define AUFS_BRATTR_COO_ALL "coo_all" | |
38335 | +#define AUFS_BRATTR_FHSM "fhsm" | |
38336 | +#define AUFS_BRATTR_UNPIN "unpin" | |
c1595e42 JR |
38337 | +#define AUFS_BRATTR_ICEX "icex" |
38338 | +#define AUFS_BRATTR_ICEX_SEC "icexsec" | |
38339 | +#define AUFS_BRATTR_ICEX_SYS "icexsys" | |
38340 | +#define AUFS_BRATTR_ICEX_TR "icextr" | |
38341 | +#define AUFS_BRATTR_ICEX_USR "icexusr" | |
38342 | +#define AUFS_BRATTR_ICEX_OTH "icexoth" | |
1e00d052 AM |
38343 | +#define AUFS_BRRATTR_WH "wh" |
38344 | +#define AUFS_BRWATTR_NLWH "nolwh" | |
076b876e AM |
38345 | +#define AUFS_BRWATTR_MOO "moo" |
38346 | + | |
38347 | +#define AuBrPerm_RW 1 /* writable, hardlinkable wh */ | |
38348 | +#define AuBrPerm_RO (1 << 1) /* readonly */ | |
38349 | +#define AuBrPerm_RR (1 << 2) /* natively readonly */ | |
38350 | +#define AuBrPerm_Mask (AuBrPerm_RW | AuBrPerm_RO | AuBrPerm_RR) | |
38351 | + | |
38352 | +#define AuBrAttr_COO_REG (1 << 3) /* copy-up on open */ | |
38353 | +#define AuBrAttr_COO_ALL (1 << 4) | |
38354 | +#define AuBrAttr_COO_Mask (AuBrAttr_COO_REG | AuBrAttr_COO_ALL) | |
38355 | + | |
38356 | +#define AuBrAttr_FHSM (1 << 5) /* file-based hsm */ | |
38357 | +#define AuBrAttr_UNPIN (1 << 6) /* rename-able top dir of | |
c1595e42 JR |
38358 | + branch. meaningless since |
38359 | + linux-3.18-rc1 */ | |
38360 | + | |
38361 | +/* ignore error in copying XATTR */ | |
38362 | +#define AuBrAttr_ICEX_SEC (1 << 7) | |
38363 | +#define AuBrAttr_ICEX_SYS (1 << 8) | |
38364 | +#define AuBrAttr_ICEX_TR (1 << 9) | |
38365 | +#define AuBrAttr_ICEX_USR (1 << 10) | |
38366 | +#define AuBrAttr_ICEX_OTH (1 << 11) | |
38367 | +#define AuBrAttr_ICEX (AuBrAttr_ICEX_SEC \ | |
38368 | + | AuBrAttr_ICEX_SYS \ | |
38369 | + | AuBrAttr_ICEX_TR \ | |
38370 | + | AuBrAttr_ICEX_USR \ | |
38371 | + | AuBrAttr_ICEX_OTH) | |
38372 | + | |
38373 | +#define AuBrRAttr_WH (1 << 12) /* whiteout-able */ | |
076b876e AM |
38374 | +#define AuBrRAttr_Mask AuBrRAttr_WH |
38375 | + | |
c1595e42 JR |
38376 | +#define AuBrWAttr_NoLinkWH (1 << 13) /* un-hardlinkable whiteouts */ |
38377 | +#define AuBrWAttr_MOO (1 << 14) /* move-up on open */ | |
076b876e AM |
38378 | +#define AuBrWAttr_Mask (AuBrWAttr_NoLinkWH | AuBrWAttr_MOO) |
38379 | + | |
38380 | +#define AuBrAttr_CMOO_Mask (AuBrAttr_COO_Mask | AuBrWAttr_MOO) | |
38381 | + | |
c1595e42 | 38382 | +/* #warning test userspace */ |
076b876e AM |
38383 | +#ifdef __KERNEL__ |
38384 | +#ifndef CONFIG_AUFS_FHSM | |
38385 | +#undef AuBrAttr_FHSM | |
38386 | +#define AuBrAttr_FHSM 0 | |
38387 | +#endif | |
c1595e42 JR |
38388 | +#ifndef CONFIG_AUFS_XATTR |
38389 | +#undef AuBrAttr_ICEX | |
38390 | +#define AuBrAttr_ICEX 0 | |
38391 | +#undef AuBrAttr_ICEX_SEC | |
38392 | +#define AuBrAttr_ICEX_SEC 0 | |
38393 | +#undef AuBrAttr_ICEX_SYS | |
38394 | +#define AuBrAttr_ICEX_SYS 0 | |
38395 | +#undef AuBrAttr_ICEX_TR | |
38396 | +#define AuBrAttr_ICEX_TR 0 | |
38397 | +#undef AuBrAttr_ICEX_USR | |
38398 | +#define AuBrAttr_ICEX_USR 0 | |
38399 | +#undef AuBrAttr_ICEX_OTH | |
38400 | +#define AuBrAttr_ICEX_OTH 0 | |
38401 | +#endif | |
076b876e AM |
38402 | +#endif |
38403 | + | |
38404 | +/* the longest combination */ | |
c1595e42 JR |
38405 | +/* AUFS_BRATTR_ICEX and AUFS_BRATTR_ICEX_TR don't affect here */ |
38406 | +#define AuBrPermStrSz sizeof(AUFS_BRPERM_RW \ | |
38407 | + "+" AUFS_BRATTR_COO_REG \ | |
38408 | + "+" AUFS_BRATTR_FHSM \ | |
38409 | + "+" AUFS_BRATTR_UNPIN \ | |
7e9cd9fe AM |
38410 | + "+" AUFS_BRATTR_ICEX_SEC \ |
38411 | + "+" AUFS_BRATTR_ICEX_SYS \ | |
38412 | + "+" AUFS_BRATTR_ICEX_USR \ | |
38413 | + "+" AUFS_BRATTR_ICEX_OTH \ | |
076b876e AM |
38414 | + "+" AUFS_BRWATTR_NLWH) |
38415 | + | |
38416 | +typedef struct { | |
38417 | + char a[AuBrPermStrSz]; | |
38418 | +} au_br_perm_str_t; | |
38419 | + | |
38420 | +static inline int au_br_writable(int brperm) | |
38421 | +{ | |
38422 | + return brperm & AuBrPerm_RW; | |
38423 | +} | |
38424 | + | |
38425 | +static inline int au_br_whable(int brperm) | |
38426 | +{ | |
38427 | + return brperm & (AuBrPerm_RW | AuBrRAttr_WH); | |
38428 | +} | |
38429 | + | |
38430 | +static inline int au_br_wh_linkable(int brperm) | |
38431 | +{ | |
38432 | + return !(brperm & AuBrWAttr_NoLinkWH); | |
38433 | +} | |
38434 | + | |
38435 | +static inline int au_br_cmoo(int brperm) | |
38436 | +{ | |
38437 | + return brperm & AuBrAttr_CMOO_Mask; | |
38438 | +} | |
38439 | + | |
38440 | +static inline int au_br_fhsm(int brperm) | |
38441 | +{ | |
38442 | + return brperm & AuBrAttr_FHSM; | |
38443 | +} | |
7f207e10 AM |
38444 | + |
38445 | +/* ---------------------------------------------------------------------- */ | |
38446 | + | |
38447 | +/* ioctl */ | |
38448 | +enum { | |
38449 | + /* readdir in userspace */ | |
38450 | + AuCtl_RDU, | |
38451 | + AuCtl_RDU_INO, | |
38452 | + | |
076b876e AM |
38453 | + AuCtl_WBR_FD, /* pathconf wrapper */ |
38454 | + AuCtl_IBUSY, /* busy inode */ | |
38455 | + AuCtl_MVDOWN, /* move-down */ | |
38456 | + AuCtl_BR, /* info about branches */ | |
38457 | + AuCtl_FHSM_FD /* connection for fhsm */ | |
7f207e10 AM |
38458 | +}; |
38459 | + | |
38460 | +/* borrowed from linux/include/linux/kernel.h */ | |
38461 | +#ifndef ALIGN | |
38462 | +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) | |
38463 | +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) | |
38464 | +#endif | |
38465 | + | |
38466 | +/* borrowed from linux/include/linux/compiler-gcc3.h */ | |
38467 | +#ifndef __aligned | |
38468 | +#define __aligned(x) __attribute__((aligned(x))) | |
53392da6 AM |
38469 | +#endif |
38470 | + | |
38471 | +#ifdef __KERNEL__ | |
38472 | +#ifndef __packed | |
7f207e10 AM |
38473 | +#define __packed __attribute__((packed)) |
38474 | +#endif | |
53392da6 | 38475 | +#endif |
7f207e10 AM |
38476 | + |
38477 | +struct au_rdu_cookie { | |
9dbd164d AM |
38478 | + uint64_t h_pos; |
38479 | + int16_t bindex; | |
38480 | + uint8_t flags; | |
38481 | + uint8_t pad; | |
38482 | + uint32_t generation; | |
7f207e10 AM |
38483 | +} __aligned(8); |
38484 | + | |
38485 | +struct au_rdu_ent { | |
9dbd164d AM |
38486 | + uint64_t ino; |
38487 | + int16_t bindex; | |
38488 | + uint8_t type; | |
38489 | + uint8_t nlen; | |
38490 | + uint8_t wh; | |
7f207e10 AM |
38491 | + char name[0]; |
38492 | +} __aligned(8); | |
38493 | + | |
38494 | +static inline int au_rdu_len(int nlen) | |
38495 | +{ | |
38496 | + /* include the terminating NULL */ | |
38497 | + return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, | |
9dbd164d | 38498 | + sizeof(uint64_t)); |
7f207e10 AM |
38499 | +} |
38500 | + | |
38501 | +union au_rdu_ent_ul { | |
38502 | + struct au_rdu_ent __user *e; | |
9dbd164d | 38503 | + uint64_t ul; |
7f207e10 AM |
38504 | +}; |
38505 | + | |
38506 | +enum { | |
38507 | + AufsCtlRduV_SZ, | |
38508 | + AufsCtlRduV_End | |
38509 | +}; | |
38510 | + | |
38511 | +struct aufs_rdu { | |
38512 | + /* input */ | |
38513 | + union { | |
9dbd164d AM |
38514 | + uint64_t sz; /* AuCtl_RDU */ |
38515 | + uint64_t nent; /* AuCtl_RDU_INO */ | |
7f207e10 AM |
38516 | + }; |
38517 | + union au_rdu_ent_ul ent; | |
9dbd164d | 38518 | + uint16_t verify[AufsCtlRduV_End]; |
7f207e10 AM |
38519 | + |
38520 | + /* input/output */ | |
9dbd164d | 38521 | + uint32_t blk; |
7f207e10 AM |
38522 | + |
38523 | + /* output */ | |
38524 | + union au_rdu_ent_ul tail; | |
38525 | + /* number of entries which were added in a single call */ | |
9dbd164d AM |
38526 | + uint64_t rent; |
38527 | + uint8_t full; | |
38528 | + uint8_t shwh; | |
7f207e10 AM |
38529 | + |
38530 | + struct au_rdu_cookie cookie; | |
38531 | +} __aligned(8); | |
38532 | + | |
1e00d052 AM |
38533 | +/* ---------------------------------------------------------------------- */ |
38534 | + | |
8b6a4947 AM |
38535 | +/* dirren. the branch is identified by the filename who contains this */ |
38536 | +struct au_drinfo { | |
38537 | + uint64_t ino; | |
38538 | + union { | |
38539 | + uint8_t oldnamelen; | |
38540 | + uint64_t _padding; | |
38541 | + }; | |
38542 | + uint8_t oldname[0]; | |
38543 | +} __aligned(8); | |
38544 | + | |
38545 | +struct au_drinfo_fdata { | |
38546 | + uint32_t magic; | |
38547 | + struct au_drinfo drinfo; | |
38548 | +} __aligned(8); | |
38549 | + | |
38550 | +#define AUFS_DRINFO_MAGIC_V1 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x01) | |
38551 | +/* future */ | |
38552 | +#define AUFS_DRINFO_MAGIC_V2 ('a' << 24 | 'd' << 16 | 'r' << 8 | 0x02) | |
38553 | + | |
38554 | +/* ---------------------------------------------------------------------- */ | |
38555 | + | |
1e00d052 | 38556 | +struct aufs_wbr_fd { |
9dbd164d AM |
38557 | + uint32_t oflags; |
38558 | + int16_t brid; | |
1e00d052 AM |
38559 | +} __aligned(8); |
38560 | + | |
38561 | +/* ---------------------------------------------------------------------- */ | |
38562 | + | |
027c5e7a | 38563 | +struct aufs_ibusy { |
9dbd164d AM |
38564 | + uint64_t ino, h_ino; |
38565 | + int16_t bindex; | |
027c5e7a AM |
38566 | +} __aligned(8); |
38567 | + | |
1e00d052 AM |
38568 | +/* ---------------------------------------------------------------------- */ |
38569 | + | |
392086de AM |
38570 | +/* error code for move-down */ |
38571 | +/* the actual message strings are implemented in aufs-util.git */ | |
38572 | +enum { | |
38573 | + EAU_MVDOWN_OPAQUE = 1, | |
38574 | + EAU_MVDOWN_WHITEOUT, | |
38575 | + EAU_MVDOWN_UPPER, | |
38576 | + EAU_MVDOWN_BOTTOM, | |
38577 | + EAU_MVDOWN_NOUPPER, | |
38578 | + EAU_MVDOWN_NOLOWERBR, | |
38579 | + EAU_Last | |
38580 | +}; | |
38581 | + | |
c2b27bf2 | 38582 | +/* flags for move-down */ |
392086de AM |
38583 | +#define AUFS_MVDOWN_DMSG 1 |
38584 | +#define AUFS_MVDOWN_OWLOWER (1 << 1) /* overwrite lower */ | |
38585 | +#define AUFS_MVDOWN_KUPPER (1 << 2) /* keep upper */ | |
38586 | +#define AUFS_MVDOWN_ROLOWER (1 << 3) /* do even if lower is RO */ | |
38587 | +#define AUFS_MVDOWN_ROLOWER_R (1 << 4) /* did on lower RO */ | |
38588 | +#define AUFS_MVDOWN_ROUPPER (1 << 5) /* do even if upper is RO */ | |
38589 | +#define AUFS_MVDOWN_ROUPPER_R (1 << 6) /* did on upper RO */ | |
38590 | +#define AUFS_MVDOWN_BRID_UPPER (1 << 7) /* upper brid */ | |
38591 | +#define AUFS_MVDOWN_BRID_LOWER (1 << 8) /* lower brid */ | |
076b876e AM |
38592 | +#define AUFS_MVDOWN_FHSM_LOWER (1 << 9) /* find fhsm attr for lower */ |
38593 | +#define AUFS_MVDOWN_STFS (1 << 10) /* req. stfs */ | |
38594 | +#define AUFS_MVDOWN_STFS_FAILED (1 << 11) /* output: stfs is unusable */ | |
38595 | +#define AUFS_MVDOWN_BOTTOM (1 << 12) /* output: no more lowers */ | |
c2b27bf2 | 38596 | + |
076b876e | 38597 | +/* index for move-down */ |
392086de AM |
38598 | +enum { |
38599 | + AUFS_MVDOWN_UPPER, | |
38600 | + AUFS_MVDOWN_LOWER, | |
38601 | + AUFS_MVDOWN_NARRAY | |
38602 | +}; | |
38603 | + | |
076b876e AM |
38604 | +/* |
38605 | + * additional info of move-down | |
38606 | + * number of free blocks and inodes. | |
38607 | + * subset of struct kstatfs, but smaller and always 64bit. | |
38608 | + */ | |
38609 | +struct aufs_stfs { | |
38610 | + uint64_t f_blocks; | |
38611 | + uint64_t f_bavail; | |
38612 | + uint64_t f_files; | |
38613 | + uint64_t f_ffree; | |
38614 | +}; | |
38615 | + | |
38616 | +struct aufs_stbr { | |
38617 | + int16_t brid; /* optional input */ | |
38618 | + int16_t bindex; /* output */ | |
38619 | + struct aufs_stfs stfs; /* output when AUFS_MVDOWN_STFS set */ | |
38620 | +} __aligned(8); | |
38621 | + | |
c2b27bf2 | 38622 | +struct aufs_mvdown { |
076b876e AM |
38623 | + uint32_t flags; /* input/output */ |
38624 | + struct aufs_stbr stbr[AUFS_MVDOWN_NARRAY]; /* input/output */ | |
38625 | + int8_t au_errno; /* output */ | |
38626 | +} __aligned(8); | |
38627 | + | |
38628 | +/* ---------------------------------------------------------------------- */ | |
38629 | + | |
38630 | +union aufs_brinfo { | |
38631 | + /* PATH_MAX may differ between kernel-space and user-space */ | |
38632 | + char _spacer[4096]; | |
392086de | 38633 | + struct { |
076b876e AM |
38634 | + int16_t id; |
38635 | + int perm; | |
38636 | + char path[0]; | |
38637 | + }; | |
c2b27bf2 AM |
38638 | +} __aligned(8); |
38639 | + | |
38640 | +/* ---------------------------------------------------------------------- */ | |
38641 | + | |
7f207e10 AM |
38642 | +#define AuCtlType 'A' |
38643 | +#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) | |
38644 | +#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) | |
1e00d052 AM |
38645 | +#define AUFS_CTL_WBR_FD _IOW(AuCtlType, AuCtl_WBR_FD, \ |
38646 | + struct aufs_wbr_fd) | |
027c5e7a | 38647 | +#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) |
392086de AM |
38648 | +#define AUFS_CTL_MVDOWN _IOWR(AuCtlType, AuCtl_MVDOWN, \ |
38649 | + struct aufs_mvdown) | |
076b876e AM |
38650 | +#define AUFS_CTL_BRINFO _IOW(AuCtlType, AuCtl_BR, union aufs_brinfo) |
38651 | +#define AUFS_CTL_FHSM_FD _IOW(AuCtlType, AuCtl_FHSM_FD, int) | |
7f207e10 AM |
38652 | + |
38653 | +#endif /* __AUFS_TYPE_H__ */ | |
2121bcd9 | 38654 | SPDX-License-Identifier: GPL-2.0 |
cd7a4cd9 | 38655 | aufs4.x-rcN loopback patch |
5527c038 JR |
38656 | |
38657 | diff --git a/drivers/block/loop.c b/drivers/block/loop.c | |
cd7a4cd9 | 38658 | index 5678bf8..ec9c4fb 100644 |
5527c038 JR |
38659 | --- a/drivers/block/loop.c |
38660 | +++ b/drivers/block/loop.c | |
cd7a4cd9 | 38661 | @@ -626,6 +626,15 @@ static inline void loop_update_dio(struct loop_device *lo) |
8b6a4947 | 38662 | lo->use_dio); |
5527c038 JR |
38663 | } |
38664 | ||
5527c038 JR |
38665 | +static struct file *loop_real_file(struct file *file) |
38666 | +{ | |
38667 | + struct file *f = NULL; | |
38668 | + | |
38669 | + if (file->f_path.dentry->d_sb->s_op->real_loop) | |
38670 | + f = file->f_path.dentry->d_sb->s_op->real_loop(file); | |
38671 | + return f; | |
8b6a4947 AM |
38672 | +} |
38673 | + | |
c2c0f25c | 38674 | static void loop_reread_partitions(struct loop_device *lo, |
8b6a4947 AM |
38675 | struct block_device *bdev) |
38676 | { | |
cd7a4cd9 | 38677 | @@ -690,6 +699,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
5527c038 JR |
38678 | unsigned int arg) |
38679 | { | |
38680 | struct file *file, *old_file; | |
38681 | + struct file *f, *virt_file = NULL, *old_virt_file; | |
38682 | struct inode *inode; | |
38683 | int error; | |
38684 | ||
cd7a4cd9 AM |
38685 | @@ -706,6 +716,12 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
38686 | file = fget(arg); | |
38687 | if (!file) | |
38688 | goto out; | |
5527c038 JR |
38689 | + f = loop_real_file(file); |
38690 | + if (f) { | |
38691 | + virt_file = file; | |
38692 | + file = f; | |
38693 | + get_file(file); | |
38694 | + } | |
38695 | ||
cd7a4cd9 AM |
38696 | error = loop_validate_file(file, bdev); |
38697 | if (error) | |
38698 | @@ -713,6 +729,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, | |
38699 | ||
5527c038 JR |
38700 | inode = file->f_mapping->host; |
38701 | old_file = lo->lo_backing_file; | |
38702 | + old_virt_file = lo->lo_backing_virt_file; | |
38703 | ||
38704 | error = -EINVAL; | |
38705 | ||
cd7a4cd9 | 38706 | @@ -724,6 +741,7 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
8b6a4947 AM |
38707 | blk_mq_freeze_queue(lo->lo_queue); |
38708 | mapping_set_gfp_mask(old_file->f_mapping, lo->old_gfp_mask); | |
38709 | lo->lo_backing_file = file; | |
38710 | + lo->lo_backing_virt_file = virt_file; | |
38711 | lo->old_gfp_mask = mapping_gfp_mask(file->f_mapping); | |
38712 | mapping_set_gfp_mask(file->f_mapping, | |
38713 | lo->old_gfp_mask & ~(__GFP_IO|__GFP_FS)); | |
cd7a4cd9 | 38714 | @@ -731,12 +749,16 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev, |
8b6a4947 | 38715 | blk_mq_unfreeze_queue(lo->lo_queue); |
5527c038 JR |
38716 | |
38717 | fput(old_file); | |
38718 | + if (old_virt_file) | |
38719 | + fput(old_virt_file); | |
38720 | if (lo->lo_flags & LO_FLAGS_PARTSCAN) | |
c2c0f25c | 38721 | loop_reread_partitions(lo, bdev); |
5527c038 JR |
38722 | return 0; |
38723 | ||
38724 | out_putf: | |
38725 | fput(file); | |
38726 | + if (virt_file) | |
38727 | + fput(virt_file); | |
38728 | out: | |
38729 | return error; | |
38730 | } | |
cd7a4cd9 | 38731 | @@ -924,7 +946,7 @@ static int loop_prepare_queue(struct loop_device *lo) |
5527c038 JR |
38732 | static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
38733 | struct block_device *bdev, unsigned int arg) | |
38734 | { | |
062440b3 | 38735 | - struct file *file; |
5527c038 JR |
38736 | + struct file *file, *f, *virt_file = NULL; |
38737 | struct inode *inode; | |
38738 | struct address_space *mapping; | |
8b6a4947 | 38739 | int lo_flags = 0; |
cd7a4cd9 | 38740 | @@ -938,6 +960,12 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
5527c038 JR |
38741 | file = fget(arg); |
38742 | if (!file) | |
38743 | goto out; | |
38744 | + f = loop_real_file(file); | |
38745 | + if (f) { | |
38746 | + virt_file = file; | |
38747 | + file = f; | |
38748 | + get_file(file); | |
38749 | + } | |
38750 | ||
38751 | error = -EBUSY; | |
38752 | if (lo->lo_state != Lo_unbound) | |
cd7a4cd9 | 38753 | @@ -970,6 +998,7 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
5527c038 JR |
38754 | lo->lo_device = bdev; |
38755 | lo->lo_flags = lo_flags; | |
38756 | lo->lo_backing_file = file; | |
38757 | + lo->lo_backing_virt_file = virt_file; | |
38758 | lo->transfer = NULL; | |
38759 | lo->ioctl = NULL; | |
38760 | lo->lo_sizelimit = 0; | |
cd7a4cd9 | 38761 | @@ -1003,6 +1032,8 @@ static int loop_set_fd(struct loop_device *lo, fmode_t mode, |
5527c038 JR |
38762 | |
38763 | out_putf: | |
38764 | fput(file); | |
38765 | + if (virt_file) | |
38766 | + fput(virt_file); | |
38767 | out: | |
38768 | /* This is safe: open() is still holding a reference. */ | |
38769 | module_put(THIS_MODULE); | |
cd7a4cd9 | 38770 | @@ -1049,6 +1080,7 @@ loop_init_xfer(struct loop_device *lo, struct loop_func_table *xfer, |
5527c038 JR |
38771 | static int loop_clr_fd(struct loop_device *lo) |
38772 | { | |
38773 | struct file *filp = lo->lo_backing_file; | |
38774 | + struct file *virt_filp = lo->lo_backing_virt_file; | |
38775 | gfp_t gfp = lo->old_gfp_mask; | |
38776 | struct block_device *bdev = lo->lo_device; | |
38777 | ||
cd7a4cd9 | 38778 | @@ -1080,6 +1112,7 @@ static int loop_clr_fd(struct loop_device *lo) |
5527c038 JR |
38779 | spin_lock_irq(&lo->lo_lock); |
38780 | lo->lo_state = Lo_rundown; | |
38781 | lo->lo_backing_file = NULL; | |
38782 | + lo->lo_backing_virt_file = NULL; | |
38783 | spin_unlock_irq(&lo->lo_lock); | |
38784 | ||
38785 | loop_release_xfer(lo); | |
cd7a4cd9 | 38786 | @@ -1128,6 +1161,8 @@ static int loop_clr_fd(struct loop_device *lo) |
5527c038 JR |
38787 | * bd_mutex which is usually taken before lo_ctl_mutex. |
38788 | */ | |
38789 | fput(filp); | |
38790 | + if (virt_filp) | |
38791 | + fput(virt_filp); | |
38792 | return 0; | |
38793 | } | |
38794 | ||
38795 | diff --git a/drivers/block/loop.h b/drivers/block/loop.h | |
cd7a4cd9 | 38796 | index 4d42c7a..a4974ee 100644 |
5527c038 JR |
38797 | --- a/drivers/block/loop.h |
38798 | +++ b/drivers/block/loop.h | |
38799 | @@ -46,7 +46,7 @@ struct loop_device { | |
38800 | int (*ioctl)(struct loop_device *, int cmd, | |
38801 | unsigned long arg); | |
38802 | ||
38803 | - struct file * lo_backing_file; | |
38804 | + struct file * lo_backing_file, *lo_backing_virt_file; | |
38805 | struct block_device *lo_device; | |
5527c038 | 38806 | void *key_data; |
8b6a4947 | 38807 | |
5527c038 | 38808 | diff --git a/fs/aufs/f_op.c b/fs/aufs/f_op.c |
cd7a4cd9 | 38809 | index 937a20d..1355656 100644 |
5527c038 JR |
38810 | --- a/fs/aufs/f_op.c |
38811 | +++ b/fs/aufs/f_op.c | |
2121bcd9 | 38812 | @@ -358,7 +358,7 @@ static ssize_t aufs_read_iter(struct kiocb *kio, struct iov_iter *iov_iter) |
5527c038 JR |
38813 | if (IS_ERR(h_file)) |
38814 | goto out; | |
38815 | ||
38816 | - if (au_test_loopback_kthread()) { | |
38817 | + if (0 && au_test_loopback_kthread()) { | |
38818 | au_warn_loopback(h_file->f_path.dentry->d_sb); | |
38819 | if (file->f_mapping != h_file->f_mapping) { | |
38820 | file->f_mapping = h_file->f_mapping; | |
38821 | diff --git a/fs/aufs/loop.c b/fs/aufs/loop.c | |
cd7a4cd9 | 38822 | index 3d84349..a642de5 100644 |
5527c038 JR |
38823 | --- a/fs/aufs/loop.c |
38824 | +++ b/fs/aufs/loop.c | |
2121bcd9 | 38825 | @@ -133,3 +133,19 @@ void au_loopback_fin(void) |
79b8bda9 | 38826 | symbol_put(loop_backing_file); |
1c60b727 | 38827 | kfree(au_warn_loopback_array); |
5527c038 JR |
38828 | } |
38829 | + | |
38830 | +/* ---------------------------------------------------------------------- */ | |
38831 | + | |
38832 | +/* support the loopback block device insude aufs */ | |
38833 | + | |
38834 | +struct file *aufs_real_loop(struct file *file) | |
38835 | +{ | |
38836 | + struct file *f; | |
38837 | + | |
38838 | + BUG_ON(!au_test_aufs(file->f_path.dentry->d_sb)); | |
38839 | + fi_read_lock(file); | |
38840 | + f = au_hf_top(file); | |
38841 | + fi_read_unlock(file); | |
38842 | + AuDebugOn(!f); | |
38843 | + return f; | |
38844 | +} | |
38845 | diff --git a/fs/aufs/loop.h b/fs/aufs/loop.h | |
062440b3 | 38846 | index 05d703d..6bb23c8 100644 |
5527c038 JR |
38847 | --- a/fs/aufs/loop.h |
38848 | +++ b/fs/aufs/loop.h | |
2121bcd9 | 38849 | @@ -26,7 +26,11 @@ void au_warn_loopback(struct super_block *h_sb); |
5527c038 JR |
38850 | |
38851 | int au_loopback_init(void); | |
38852 | void au_loopback_fin(void); | |
38853 | + | |
38854 | +struct file *aufs_real_loop(struct file *file); | |
38855 | #else | |
38856 | +AuStub(struct file *, loop_backing_file, return NULL) | |
38857 | + | |
38858 | AuStubInt0(au_test_loopback_overlap, struct super_block *sb, | |
38859 | struct dentry *h_adding) | |
38860 | AuStubInt0(au_test_loopback_kthread, void) | |
2121bcd9 | 38861 | @@ -34,6 +38,8 @@ AuStubVoid(au_warn_loopback, struct super_block *h_sb) |
5527c038 JR |
38862 | |
38863 | AuStubInt0(au_loopback_init, void) | |
38864 | AuStubVoid(au_loopback_fin, void) | |
38865 | + | |
38866 | +AuStub(struct file *, aufs_real_loop, return NULL, struct file *file) | |
38867 | #endif /* BLK_DEV_LOOP */ | |
38868 | ||
38869 | #endif /* __KERNEL__ */ | |
38870 | diff --git a/fs/aufs/super.c b/fs/aufs/super.c | |
cd7a4cd9 | 38871 | index 4020639..13e315f 100644 |
5527c038 JR |
38872 | --- a/fs/aufs/super.c |
38873 | +++ b/fs/aufs/super.c | |
062440b3 | 38874 | @@ -840,7 +840,10 @@ static const struct super_operations aufs_sop = { |
5527c038 JR |
38875 | .statfs = aufs_statfs, |
38876 | .put_super = aufs_put_super, | |
38877 | .sync_fs = aufs_sync_fs, | |
38878 | - .remount_fs = aufs_remount_fs | |
38879 | + .remount_fs = aufs_remount_fs, | |
38880 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
38881 | + .real_loop = aufs_real_loop | |
38882 | +#endif | |
38883 | }; | |
38884 | ||
38885 | /* ---------------------------------------------------------------------- */ | |
38886 | diff --git a/include/linux/fs.h b/include/linux/fs.h | |
cd7a4cd9 | 38887 | index 0d0d247f..50d77f8 100644 |
5527c038 JR |
38888 | --- a/include/linux/fs.h |
38889 | +++ b/include/linux/fs.h | |
cd7a4cd9 | 38890 | @@ -1861,6 +1861,10 @@ struct super_operations { |
5527c038 JR |
38891 | struct shrink_control *); |
38892 | long (*free_cached_objects)(struct super_block *, | |
38893 | struct shrink_control *); | |
38894 | +#if defined(CONFIG_BLK_DEV_LOOP) || defined(CONFIG_BLK_DEV_LOOP_MODULE) | |
38895 | + /* and aufs */ | |
38896 | + struct file *(*real_loop)(struct file *); | |
38897 | +#endif | |
38898 | }; | |
38899 | ||
38900 | /* |