]>
Commit | Line | Data |
---|---|---|
53392da6 | 1 | aufs3.0 kbuild patch |
7f207e10 AM |
2 | |
3 | diff --git a/fs/Kconfig b/fs/Kconfig | |
2cbb1c4b | 4 | index 19891aa..b660b64 100644 |
7f207e10 AM |
5 | --- a/fs/Kconfig |
6 | +++ b/fs/Kconfig | |
2cbb1c4b | 7 | @@ -208,6 +208,7 @@ source "fs/pstore/Kconfig" |
7f207e10 AM |
8 | source "fs/sysv/Kconfig" |
9 | source "fs/ufs/Kconfig" | |
10 | source "fs/exofs/Kconfig" | |
11 | +source "fs/aufs/Kconfig" | |
12 | ||
13 | endif # MISC_FILESYSTEMS | |
14 | ||
15 | diff --git a/fs/Makefile b/fs/Makefile | |
2cbb1c4b | 16 | index fb68c2b..c031a85 100644 |
7f207e10 AM |
17 | --- a/fs/Makefile |
18 | +++ b/fs/Makefile | |
2cbb1c4b | 19 | @@ -124,3 +124,4 @@ obj-$(CONFIG_GFS2_FS) += gfs2/ |
7f207e10 AM |
20 | obj-$(CONFIG_EXOFS_FS) += exofs/ |
21 | obj-$(CONFIG_CEPH_FS) += ceph/ | |
bf0370f2 | 22 | obj-$(CONFIG_PSTORE) += pstore/ |
2cbb1c4b | 23 | +obj-$(CONFIG_AUFS_FS) += aufs/ |
7f207e10 | 24 | diff --git a/include/linux/Kbuild b/include/linux/Kbuild |
2cbb1c4b | 25 | index 01f6362..8b3b9f1 100644 |
7f207e10 AM |
26 | --- a/include/linux/Kbuild |
27 | +++ b/include/linux/Kbuild | |
2cbb1c4b | 28 | @@ -65,6 +65,7 @@ header-y += atmppp.h |
7f207e10 AM |
29 | header-y += atmsap.h |
30 | header-y += atmsvc.h | |
31 | header-y += audit.h | |
32 | +header-y += aufs_type.h | |
33 | header-y += auto_fs.h | |
34 | header-y += auto_fs4.h | |
35 | header-y += auxvec.h | |
53392da6 | 36 | aufs3.0 base patch |
7f207e10 AM |
37 | |
38 | diff --git a/fs/namei.c b/fs/namei.c | |
53392da6 | 39 | index 14ab8d3..eb4aef1 100644 |
7f207e10 AM |
40 | --- a/fs/namei.c |
41 | +++ b/fs/namei.c | |
53392da6 | 42 | @@ -1697,7 +1697,7 @@ static struct dentry *__lookup_hash(struct qstr *name, |
7f207e10 AM |
43 | * needs parent already locked. Doesn't follow mounts. |
44 | * SMP-safe. | |
45 | */ | |
46 | -static struct dentry *lookup_hash(struct nameidata *nd) | |
47 | +struct dentry *lookup_hash(struct nameidata *nd) | |
48 | { | |
7f207e10 AM |
49 | return __lookup_hash(&nd->last, nd->path.dentry, nd); |
50 | } | |
7f207e10 | 51 | diff --git a/fs/splice.c b/fs/splice.c |
2cbb1c4b | 52 | index aa866d3..19afec6 100644 |
7f207e10 AM |
53 | --- a/fs/splice.c |
54 | +++ b/fs/splice.c | |
2cbb1c4b | 55 | @@ -1085,8 +1085,8 @@ EXPORT_SYMBOL(generic_splice_sendpage); |
7f207e10 AM |
56 | /* |
57 | * Attempt to initiate a splice from pipe to file. | |
58 | */ | |
59 | -static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
60 | - loff_t *ppos, size_t len, unsigned int flags) | |
61 | +long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
62 | + loff_t *ppos, size_t len, unsigned int flags) | |
63 | { | |
64 | ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, | |
65 | loff_t *, size_t, unsigned int); | |
2cbb1c4b | 66 | @@ -1113,9 +1113,9 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
7f207e10 AM |
67 | /* |
68 | * Attempt to initiate a splice from a file to a pipe. | |
69 | */ | |
70 | -static long do_splice_to(struct file *in, loff_t *ppos, | |
71 | - struct pipe_inode_info *pipe, size_t len, | |
72 | - unsigned int flags) | |
73 | +long do_splice_to(struct file *in, loff_t *ppos, | |
74 | + struct pipe_inode_info *pipe, size_t len, | |
75 | + unsigned int flags) | |
76 | { | |
77 | ssize_t (*splice_read)(struct file *, loff_t *, | |
78 | struct pipe_inode_info *, size_t, unsigned int); | |
79 | diff --git a/include/linux/namei.h b/include/linux/namei.h | |
2cbb1c4b | 80 | index eba45ea..21ed6c9 100644 |
7f207e10 AM |
81 | --- a/include/linux/namei.h |
82 | +++ b/include/linux/namei.h | |
2cbb1c4b | 83 | @@ -82,6 +82,7 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *, |
7f207e10 AM |
84 | extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry, |
85 | int (*open)(struct inode *, struct file *)); | |
86 | ||
87 | +extern struct dentry *lookup_hash(struct nameidata *nd); | |
7f207e10 AM |
88 | extern struct dentry *lookup_one_len(const char *, struct dentry *, int); |
89 | ||
027c5e7a | 90 | extern int follow_down_one(struct path *); |
7f207e10 AM |
91 | diff --git a/include/linux/splice.h b/include/linux/splice.h |
92 | index 997c3b4..be9a153 100644 | |
93 | --- a/include/linux/splice.h | |
94 | +++ b/include/linux/splice.h | |
95 | @@ -89,4 +89,10 @@ extern int splice_grow_spd(struct pipe_inode_info *, struct splice_pipe_desc *); | |
96 | extern void splice_shrink_spd(struct pipe_inode_info *, | |
97 | struct splice_pipe_desc *); | |
98 | ||
99 | +extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
100 | + loff_t *ppos, size_t len, unsigned int flags); | |
101 | +extern long do_splice_to(struct file *in, loff_t *ppos, | |
102 | + struct pipe_inode_info *pipe, size_t len, | |
103 | + unsigned int flags); | |
1facf9fc | 104 | + |
7f207e10 | 105 | #endif |
53392da6 | 106 | aufs3.0 standalone patch |
7f207e10 AM |
107 | |
108 | diff --git a/fs/file_table.c b/fs/file_table.c | |
2cbb1c4b | 109 | index 01e4c1e..0e800e2 100644 |
7f207e10 AM |
110 | --- a/fs/file_table.c |
111 | +++ b/fs/file_table.c | |
2cbb1c4b | 112 | @@ -443,6 +443,8 @@ void file_sb_list_del(struct file *file) |
7f207e10 AM |
113 | } |
114 | } | |
115 | ||
116 | +EXPORT_SYMBOL(file_sb_list_del); | |
1facf9fc | 117 | + |
7f207e10 AM |
118 | #ifdef CONFIG_SMP |
119 | ||
120 | /* | |
121 | diff --git a/fs/inode.c b/fs/inode.c | |
2cbb1c4b | 122 | index 43566d1..4291eae 100644 |
7f207e10 AM |
123 | --- a/fs/inode.c |
124 | +++ b/fs/inode.c | |
2cbb1c4b JR |
125 | @@ -69,6 +69,7 @@ static DEFINE_SPINLOCK(inode_lru_lock); |
126 | ||
127 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock); | |
128 | __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_wb_list_lock); | |
129 | +EXPORT_SYMBOL(inode_sb_list_lock); | |
7f207e10 AM |
130 | |
131 | /* | |
2cbb1c4b | 132 | * iprune_sem provides exclusion between the icache shrinking and the |
7f207e10 | 133 | diff --git a/fs/namei.c b/fs/namei.c |
53392da6 | 134 | index eb4aef1..66d04c6 100644 |
7f207e10 AM |
135 | --- a/fs/namei.c |
136 | +++ b/fs/namei.c | |
2cbb1c4b | 137 | @@ -365,6 +365,7 @@ int deny_write_access(struct file * file) |
7f207e10 AM |
138 | |
139 | return 0; | |
140 | } | |
141 | +EXPORT_SYMBOL(deny_write_access); | |
142 | ||
143 | /** | |
144 | * path_get - get a reference to a path | |
53392da6 | 145 | @@ -1701,6 +1702,7 @@ struct dentry *lookup_hash(struct nameidata *nd) |
027c5e7a | 146 | { |
7f207e10 AM |
147 | return __lookup_hash(&nd->last, nd->path.dentry, nd); |
148 | } | |
149 | +EXPORT_SYMBOL(lookup_hash); | |
150 | ||
7f207e10 AM |
151 | /** |
152 | * lookup_one_len - filesystem helper to lookup single pathname component | |
153 | diff --git a/fs/namespace.c b/fs/namespace.c | |
2cbb1c4b | 154 | index fe59bd1..7d3843f 100644 |
7f207e10 AM |
155 | --- a/fs/namespace.c |
156 | +++ b/fs/namespace.c | |
2cbb1c4b | 157 | @@ -1508,6 +1508,7 @@ int iterate_mounts(int (*f)(struct vfsmount *, void *), void *arg, |
7f207e10 AM |
158 | } |
159 | return 0; | |
160 | } | |
161 | +EXPORT_SYMBOL(iterate_mounts); | |
162 | ||
163 | static void cleanup_group_ids(struct vfsmount *mnt, struct vfsmount *end) | |
164 | { | |
165 | diff --git a/fs/notify/group.c b/fs/notify/group.c | |
166 | index d309f38..f0e9568 100644 | |
167 | --- a/fs/notify/group.c | |
168 | +++ b/fs/notify/group.c | |
169 | @@ -22,6 +22,7 @@ | |
170 | #include <linux/srcu.h> | |
171 | #include <linux/rculist.h> | |
172 | #include <linux/wait.h> | |
173 | +#include <linux/module.h> | |
174 | ||
175 | #include <linux/fsnotify_backend.h> | |
176 | #include "fsnotify.h" | |
177 | @@ -70,6 +71,7 @@ void fsnotify_put_group(struct fsnotify_group *group) | |
178 | if (atomic_dec_and_test(&group->refcnt)) | |
179 | fsnotify_destroy_group(group); | |
180 | } | |
181 | +EXPORT_SYMBOL(fsnotify_put_group); | |
182 | ||
183 | /* | |
184 | * Create a new fsnotify_group and hold a reference for the group returned. | |
185 | @@ -102,3 +104,4 @@ struct fsnotify_group *fsnotify_alloc_group(const struct fsnotify_ops *ops) | |
186 | ||
187 | return group; | |
188 | } | |
189 | +EXPORT_SYMBOL(fsnotify_alloc_group); | |
190 | diff --git a/fs/notify/mark.c b/fs/notify/mark.c | |
2cbb1c4b | 191 | index 252ab1f..2199b9b 100644 |
7f207e10 AM |
192 | --- a/fs/notify/mark.c |
193 | +++ b/fs/notify/mark.c | |
2cbb1c4b | 194 | @@ -112,6 +112,7 @@ void fsnotify_put_mark(struct fsnotify_mark *mark) |
7f207e10 AM |
195 | if (atomic_dec_and_test(&mark->refcnt)) |
196 | mark->free_mark(mark); | |
197 | } | |
198 | +EXPORT_SYMBOL(fsnotify_put_mark); | |
199 | ||
200 | /* | |
201 | * Any time a mark is getting freed we end up here. | |
2cbb1c4b | 202 | @@ -189,6 +190,7 @@ void fsnotify_destroy_mark(struct fsnotify_mark *mark) |
7f207e10 AM |
203 | if (unlikely(atomic_dec_and_test(&group->num_marks))) |
204 | fsnotify_final_destroy_group(group); | |
205 | } | |
206 | +EXPORT_SYMBOL(fsnotify_destroy_mark); | |
207 | ||
208 | void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask) | |
209 | { | |
2cbb1c4b | 210 | @@ -276,6 +278,7 @@ err: |
7f207e10 AM |
211 | |
212 | return ret; | |
213 | } | |
214 | +EXPORT_SYMBOL(fsnotify_add_mark); | |
215 | ||
216 | /* | |
217 | * clear any marks in a group in which mark->flags & flags is true | |
2cbb1c4b | 218 | @@ -331,6 +334,7 @@ void fsnotify_init_mark(struct fsnotify_mark *mark, |
7f207e10 AM |
219 | atomic_set(&mark->refcnt, 1); |
220 | mark->free_mark = free_mark; | |
221 | } | |
222 | +EXPORT_SYMBOL(fsnotify_init_mark); | |
223 | ||
224 | static int fsnotify_mark_destroy(void *ignored) | |
225 | { | |
226 | diff --git a/fs/open.c b/fs/open.c | |
2cbb1c4b | 227 | index b52cf01..c1b341c 100644 |
7f207e10 AM |
228 | --- a/fs/open.c |
229 | +++ b/fs/open.c | |
230 | @@ -60,6 +60,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs, | |
231 | mutex_unlock(&dentry->d_inode->i_mutex); | |
232 | return ret; | |
233 | } | |
234 | +EXPORT_SYMBOL(do_truncate); | |
235 | ||
236 | static long do_sys_truncate(const char __user *pathname, loff_t length) | |
237 | { | |
238 | diff --git a/fs/splice.c b/fs/splice.c | |
2cbb1c4b | 239 | index 19afec6..11f07f8 100644 |
7f207e10 AM |
240 | --- a/fs/splice.c |
241 | +++ b/fs/splice.c | |
2cbb1c4b | 242 | @@ -1109,6 +1109,7 @@ long do_splice_from(struct pipe_inode_info *pipe, struct file *out, |
7f207e10 AM |
243 | |
244 | return splice_write(pipe, out, ppos, len, flags); | |
245 | } | |
246 | +EXPORT_SYMBOL(do_splice_from); | |
247 | ||
248 | /* | |
249 | * Attempt to initiate a splice from a file to a pipe. | |
2cbb1c4b | 250 | @@ -1135,6 +1136,7 @@ long do_splice_to(struct file *in, loff_t *ppos, |
7f207e10 AM |
251 | |
252 | return splice_read(in, ppos, pipe, len, flags); | |
253 | } | |
254 | +EXPORT_SYMBOL(do_splice_to); | |
255 | ||
256 | /** | |
257 | * splice_direct_to_actor - splices data directly between two non-pipes | |
258 | diff --git a/security/commoncap.c b/security/commoncap.c | |
2cbb1c4b | 259 | index a93b3b7..024282c 100644 |
7f207e10 AM |
260 | --- a/security/commoncap.c |
261 | +++ b/security/commoncap.c | |
53fd41f5 | 262 | @@ -978,3 +978,4 @@ int cap_file_mmap(struct file *file, uns |
94337f0d | 263 | } |
7f207e10 AM |
264 | return ret; |
265 | } | |
266 | +EXPORT_SYMBOL(cap_file_mmap); | |
267 | diff --git a/security/device_cgroup.c b/security/device_cgroup.c | |
2cbb1c4b | 268 | index 1be6826..215278c 100644 |
7f207e10 AM |
269 | --- a/security/device_cgroup.c |
270 | +++ b/security/device_cgroup.c | |
2cbb1c4b | 271 | @@ -508,6 +508,7 @@ found: |
7f207e10 AM |
272 | |
273 | return -EPERM; | |
274 | } | |
2cbb1c4b | 275 | +EXPORT_SYMBOL(__devcgroup_inode_permission); |
7f207e10 AM |
276 | |
277 | int devcgroup_inode_mknod(int mode, dev_t dev) | |
278 | { | |
279 | diff --git a/security/security.c b/security/security.c | |
2cbb1c4b | 280 | index 4ba6d4c..9f64bb8 100644 |
7f207e10 AM |
281 | --- a/security/security.c |
282 | +++ b/security/security.c | |
2cbb1c4b | 283 | @@ -373,6 +373,7 @@ int security_path_rmdir(struct path *dir, struct dentry *dentry) |
7f207e10 AM |
284 | return 0; |
285 | return security_ops->path_rmdir(dir, dentry); | |
286 | } | |
287 | +EXPORT_SYMBOL(security_path_rmdir); | |
288 | ||
289 | int security_path_unlink(struct path *dir, struct dentry *dentry) | |
290 | { | |
2cbb1c4b | 291 | @@ -389,6 +390,7 @@ int security_path_symlink(struct path *dir, struct dentry *dentry, |
7f207e10 AM |
292 | return 0; |
293 | return security_ops->path_symlink(dir, dentry, old_name); | |
294 | } | |
295 | +EXPORT_SYMBOL(security_path_symlink); | |
296 | ||
297 | int security_path_link(struct dentry *old_dentry, struct path *new_dir, | |
298 | struct dentry *new_dentry) | |
2cbb1c4b | 299 | @@ -397,6 +399,7 @@ int security_path_link(struct dentry *old_dentry, struct path *new_dir, |
7f207e10 AM |
300 | return 0; |
301 | return security_ops->path_link(old_dentry, new_dir, new_dentry); | |
302 | } | |
303 | +EXPORT_SYMBOL(security_path_link); | |
304 | ||
305 | int security_path_rename(struct path *old_dir, struct dentry *old_dentry, | |
306 | struct path *new_dir, struct dentry *new_dentry) | |
2cbb1c4b | 307 | @@ -415,6 +418,7 @@ int security_path_truncate(struct path *path) |
7f207e10 AM |
308 | return 0; |
309 | return security_ops->path_truncate(path); | |
310 | } | |
311 | +EXPORT_SYMBOL(security_path_truncate); | |
312 | ||
313 | int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt, | |
314 | mode_t mode) | |
2cbb1c4b | 315 | @@ -423,6 +427,7 @@ int security_path_chmod(struct dentry *dentry, struct vfsmount *mnt, |
7f207e10 AM |
316 | return 0; |
317 | return security_ops->path_chmod(dentry, mnt, mode); | |
318 | } | |
319 | +EXPORT_SYMBOL(security_path_chmod); | |
320 | ||
321 | int security_path_chown(struct path *path, uid_t uid, gid_t gid) | |
322 | { | |
2cbb1c4b | 323 | @@ -430,6 +435,7 @@ int security_path_chown(struct path *path, uid_t uid, gid_t gid) |
7f207e10 AM |
324 | return 0; |
325 | return security_ops->path_chown(path, uid, gid); | |
326 | } | |
327 | +EXPORT_SYMBOL(security_path_chown); | |
328 | ||
329 | int security_path_chroot(struct path *path) | |
330 | { | |
2cbb1c4b | 331 | @@ -506,6 +512,7 @@ int security_inode_readlink(struct dentry *dentry) |
7f207e10 AM |
332 | return 0; |
333 | return security_ops->inode_readlink(dentry); | |
334 | } | |
335 | +EXPORT_SYMBOL(security_inode_readlink); | |
336 | ||
337 | int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd) | |
338 | { | |
2cbb1c4b | 339 | @@ -520,6 +527,7 @@ int security_inode_permission(struct inode *inode, int mask) |
7f207e10 | 340 | return 0; |
2cbb1c4b | 341 | return security_ops->inode_permission(inode, mask, 0); |
7f207e10 AM |
342 | } |
343 | +EXPORT_SYMBOL(security_inode_permission); | |
344 | ||
027c5e7a | 345 | int security_inode_exec_permission(struct inode *inode, unsigned int flags) |
7f207e10 | 346 | { |
2cbb1c4b | 347 | @@ -626,6 +634,7 @@ int security_file_permission(struct file *file, int mask) |
7f207e10 AM |
348 | |
349 | return fsnotify_perm(file, mask); | |
350 | } | |
351 | +EXPORT_SYMBOL(security_file_permission); | |
352 | ||
353 | int security_file_alloc(struct file *file) | |
354 | { | |
2cbb1c4b | 355 | @@ -653,6 +662,7 @@ int security_file_mmap(struct file *file, unsigned long reqprot, |
7f207e10 AM |
356 | return ret; |
357 | return ima_file_mmap(file, prot); | |
358 | } | |
359 | +EXPORT_SYMBOL(security_file_mmap); | |
360 | ||
361 | int security_file_mprotect(struct vm_area_struct *vma, unsigned long reqprot, | |
362 | unsigned long prot) | |
363 | diff -urN /usr/share/empty/Documentation/ABI/testing/debugfs-aufs linux/Documentation/ABI/testing/debugfs-aufs | |
364 | --- /usr/share/empty/Documentation/ABI/testing/debugfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 365 | +++ linux/Documentation/ABI/testing/debugfs-aufs 2011-08-24 13:30:24.727980364 +0200 |
7f207e10 AM |
366 | @@ -0,0 +1,37 @@ |
367 | +What: /debug/aufs/si_<id>/ | |
368 | +Date: March 2009 | |
369 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
370 | +Description: | |
371 | + Under /debug/aufs, a directory named si_<id> is created | |
372 | + per aufs mount, where <id> is a unique id generated | |
373 | + internally. | |
1facf9fc | 374 | + |
7f207e10 AM |
375 | +What: /debug/aufs/si_<id>/xib |
376 | +Date: March 2009 | |
377 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
378 | +Description: | |
379 | + It shows the consumed blocks by xib (External Inode Number | |
380 | + Bitmap), its block size and file size. | |
381 | + When the aufs mount option 'noxino' is specified, it | |
382 | + will be empty. About XINO files, see the aufs manual. | |
383 | + | |
384 | +What: /debug/aufs/si_<id>/xino0, xino1 ... xinoN | |
385 | +Date: March 2009 | |
386 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
387 | +Description: | |
388 | + It shows the consumed blocks by xino (External Inode Number | |
389 | + Translation Table), its link count, block size and file | |
390 | + size. | |
391 | + When the aufs mount option 'noxino' is specified, it | |
392 | + will be empty. About XINO files, see the aufs manual. | |
393 | + | |
394 | +What: /debug/aufs/si_<id>/xigen | |
395 | +Date: March 2009 | |
396 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
397 | +Description: | |
398 | + It shows the consumed blocks by xigen (External Inode | |
399 | + Generation Table), its block size and file size. | |
400 | + If CONFIG_AUFS_EXPORT is disabled, this entry will not | |
401 | + be created. | |
402 | + When the aufs mount option 'noxino' is specified, it | |
403 | + will be empty. About XINO files, see the aufs manual. | |
404 | diff -urN /usr/share/empty/Documentation/ABI/testing/sysfs-aufs linux/Documentation/ABI/testing/sysfs-aufs | |
405 | --- /usr/share/empty/Documentation/ABI/testing/sysfs-aufs 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 406 | +++ linux/Documentation/ABI/testing/sysfs-aufs 2011-08-24 13:30:24.727980364 +0200 |
7f207e10 AM |
407 | @@ -0,0 +1,24 @@ |
408 | +What: /sys/fs/aufs/si_<id>/ | |
409 | +Date: March 2009 | |
410 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
411 | +Description: | |
412 | + Under /sys/fs/aufs, a directory named si_<id> is created | |
413 | + per aufs mount, where <id> is a unique id generated | |
414 | + internally. | |
415 | + | |
416 | +What: /sys/fs/aufs/si_<id>/br0, br1 ... brN | |
417 | +Date: March 2009 | |
418 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
419 | +Description: | |
420 | + It shows the abolute path of a member directory (which | |
421 | + is called branch) in aufs, and its permission. | |
422 | + | |
423 | +What: /sys/fs/aufs/si_<id>/xi_path | |
424 | +Date: March 2009 | |
425 | +Contact: J. R. Okajima <hooanon05@yahoo.co.jp> | |
426 | +Description: | |
427 | + It shows the abolute path of XINO (External Inode Number | |
428 | + Bitmap, Translation Table and Generation Table) file | |
429 | + even if it is the default path. | |
430 | + When the aufs mount option 'noxino' is specified, it | |
431 | + will be empty. About XINO files, see the aufs manual. | |
53392da6 AM |
432 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt linux/Documentation/filesystems/aufs/design/01intro.txt |
433 | --- /usr/share/empty/Documentation/filesystems/aufs/design/01intro.txt 1970-01-01 01:00:00.000000000 +0100 | |
434 | +++ linux/Documentation/filesystems/aufs/design/01intro.txt 2011-08-24 13:30:24.727980364 +0200 | |
435 | @@ -0,0 +1,162 @@ | |
436 | + | |
437 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
438 | +# | |
439 | +# This program is free software; you can redistribute it and/or modify | |
440 | +# it under the terms of the GNU General Public License as published by | |
441 | +# the Free Software Foundation; either version 2 of the License, or | |
442 | +# (at your option) any later version. | |
443 | +# | |
444 | +# This program is distributed in the hope that it will be useful, | |
445 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
446 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
447 | +# GNU General Public License for more details. | |
448 | +# | |
449 | +# You should have received a copy of the GNU General Public License | |
450 | +# along with this program; if not, write to the Free Software | |
451 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
452 | + | |
453 | +Introduction | |
454 | +---------------------------------------- | |
455 | + | |
456 | +aufs [ei ju: ef es] | [a u f s] | |
457 | +1. abbrev. for "advanced multi-layered unification filesystem". | |
458 | +2. abbrev. for "another unionfs". | |
459 | +3. abbrev. for "auf das" in German which means "on the" in English. | |
460 | + Ex. "Butter aufs Brot"(G) means "butter onto bread"(E). | |
461 | + But "Filesystem aufs Filesystem" is hard to understand. | |
462 | + | |
463 | +AUFS is a filesystem with features: | |
464 | +- multi layered stackable unification filesystem, the member directory | |
465 | + is called as a branch. | |
466 | +- branch permission and attribute, 'readonly', 'real-readonly', | |
467 | + 'readwrite', 'whiteout-able', 'link-able whiteout' and their | |
468 | + combination. | |
469 | +- internal "file copy-on-write". | |
470 | +- logical deletion, whiteout. | |
471 | +- dynamic branch manipulation, adding, deleting and changing permission. | |
472 | +- allow bypassing aufs, user's direct branch access. | |
473 | +- external inode number translation table and bitmap which maintains the | |
474 | + persistent aufs inode number. | |
475 | +- seekable directory, including NFS readdir. | |
476 | +- file mapping, mmap and sharing pages. | |
477 | +- pseudo-link, hardlink over branches. | |
478 | +- loopback mounted filesystem as a branch. | |
479 | +- several policies to select one among multiple writable branches. | |
480 | +- revert a single systemcall when an error occurs in aufs. | |
481 | +- and more... | |
482 | + | |
483 | + | |
484 | +Multi Layered Stackable Unification Filesystem | |
485 | +---------------------------------------------------------------------- | |
486 | +Most people already knows what it is. | |
487 | +It is a filesystem which unifies several directories and provides a | |
488 | +merged single directory. When users access a file, the access will be | |
489 | +passed/re-directed/converted (sorry, I am not sure which English word is | |
490 | +correct) to the real file on the member filesystem. The member | |
491 | +filesystem is called 'lower filesystem' or 'branch' and has a mode | |
492 | +'readonly' and 'readwrite.' And the deletion for a file on the lower | |
493 | +readonly branch is handled by creating 'whiteout' on the upper writable | |
494 | +branch. | |
495 | + | |
496 | +On LKML, there have been discussions about UnionMount (Jan Blunck, | |
497 | +Bharata B Rao and Valerie Aurora) and Unionfs (Erez Zadok). They took | |
498 | +different approaches to implement the merged-view. | |
499 | +The former tries putting it into VFS, and the latter implements as a | |
500 | +separate filesystem. | |
501 | +(If I misunderstand about these implementations, please let me know and | |
502 | +I shall correct it. Because it is a long time ago when I read their | |
503 | +source files last time). | |
504 | + | |
505 | +UnionMount's approach will be able to small, but may be hard to share | |
506 | +branches between several UnionMount since the whiteout in it is | |
507 | +implemented in the inode on branch filesystem and always | |
508 | +shared. According to Bharata's post, readdir does not seems to be | |
509 | +finished yet. | |
510 | +There are several missing features known in this implementations such as | |
511 | +- for users, the inode number may change silently. eg. copy-up. | |
512 | +- link(2) may break by copy-up. | |
513 | +- read(2) may get an obsoleted filedata (fstat(2) too). | |
514 | +- fcntl(F_SETLK) may be broken by copy-up. | |
515 | +- unnecessary copy-up may happen, for example mmap(MAP_PRIVATE) after | |
516 | + open(O_RDWR). | |
517 | + | |
518 | +Unionfs has a longer history. When I started implementing a stacking filesystem | |
519 | +(Aug 2005), it already existed. It has virtual super_block, inode, | |
520 | +dentry and file objects and they have an array pointing lower same kind | |
521 | +objects. After contributing many patches for Unionfs, I re-started my | |
522 | +project AUFS (Jun 2006). | |
523 | + | |
524 | +In AUFS, the structure of filesystem resembles to Unionfs, but I | |
525 | +implemented my own ideas, approaches and enhancements and it became | |
526 | +totally different one. | |
527 | + | |
528 | +Comparing DM snapshot and fs based implementation | |
529 | +- the number of bytes to be copied between devices is much smaller. | |
530 | +- the type of filesystem must be one and only. | |
531 | +- the fs must be writable, no readonly fs, even for the lower original | |
532 | + device. so the compression fs will not be usable. but if we use | |
533 | + loopback mount, we may address this issue. | |
534 | + for instance, | |
535 | + mount /cdrom/squashfs.img /sq | |
536 | + losetup /sq/ext2.img | |
537 | + losetup /somewhere/cow | |
538 | + dmsetup "snapshot /dev/loop0 /dev/loop1 ..." | |
539 | +- it will be difficult (or needs more operations) to extract the | |
540 | + difference between the original device and COW. | |
541 | +- DM snapshot-merge may help a lot when users try merging. in the | |
542 | + fs-layer union, users will use rsync(1). | |
543 | + | |
544 | + | |
545 | +Several characters/aspects of aufs | |
546 | +---------------------------------------------------------------------- | |
547 | + | |
548 | +Aufs has several characters or aspects. | |
549 | +1. a filesystem, callee of VFS helper | |
550 | +2. sub-VFS, caller of VFS helper for branches | |
551 | +3. a virtual filesystem which maintains persistent inode number | |
552 | +4. reader/writer of files on branches such like an application | |
553 | + | |
554 | +1. Callee of VFS Helper | |
555 | +As an ordinary linux filesystem, aufs is a callee of VFS. For instance, | |
556 | +unlink(2) from an application reaches sys_unlink() kernel function and | |
557 | +then vfs_unlink() is called. vfs_unlink() is one of VFS helper and it | |
558 | +calls filesystem specific unlink operation. Actually aufs implements the | |
559 | +unlink operation but it behaves like a redirector. | |
560 | + | |
561 | +2. Caller of VFS Helper for Branches | |
562 | +aufs_unlink() passes the unlink request to the branch filesystem as if | |
563 | +it were called from VFS. So the called unlink operation of the branch | |
564 | +filesystem acts as usual. As a caller of VFS helper, aufs should handle | |
565 | +every necessary pre/post operation for the branch filesystem. | |
566 | +- acquire the lock for the parent dir on a branch | |
567 | +- lookup in a branch | |
568 | +- revalidate dentry on a branch | |
569 | +- mnt_want_write() for a branch | |
570 | +- vfs_unlink() for a branch | |
571 | +- mnt_drop_write() for a branch | |
572 | +- release the lock on a branch | |
573 | + | |
574 | +3. Persistent Inode Number | |
575 | +One of the most important issue for a filesystem is to maintain inode | |
576 | +numbers. This is particularly important to support exporting a | |
577 | +filesystem via NFS. Aufs is a virtual filesystem which doesn't have a | |
578 | +backend block device for its own. But some storage is necessary to | |
579 | +maintain inode number. It may be a large space and may not suit to keep | |
580 | +in memory. Aufs rents some space from its first writable branch | |
581 | +filesystem (by default) and creates file(s) on it. These files are | |
582 | +created by aufs internally and removed soon (currently) keeping opened. | |
583 | +Note: Because these files are removed, they are totally gone after | |
584 | + unmounting aufs. It means the inode numbers are not persistent | |
585 | + across unmount or reboot. I have a plan to make them really | |
586 | + persistent which will be important for aufs on NFS server. | |
587 | + | |
588 | +4. Read/Write Files Internally (copy-on-write) | |
589 | +Because a branch can be readonly, when you write a file on it, aufs will | |
590 | +"copy-up" it to the upper writable branch internally. And then write the | |
591 | +originally requested thing to the file. Generally kernel doesn't | |
592 | +open/read/write file actively. In aufs, even a single write may cause a | |
593 | +internal "file copy". This behaviour is very similar to cp(1) command. | |
594 | + | |
595 | +Some people may think it is better to pass such work to user space | |
596 | +helper, instead of doing in kernel space. Actually I am still thinking | |
597 | +about it. But currently I have implemented it in kernel space. | |
598 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt linux/Documentation/filesystems/aufs/design/02struct.txt | |
599 | --- /usr/share/empty/Documentation/filesystems/aufs/design/02struct.txt 1970-01-01 01:00:00.000000000 +0100 | |
600 | +++ linux/Documentation/filesystems/aufs/design/02struct.txt 2011-08-24 13:30:24.727980364 +0200 | |
601 | @@ -0,0 +1,226 @@ | |
602 | + | |
603 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
604 | +# | |
605 | +# This program is free software; you can redistribute it and/or modify | |
606 | +# it under the terms of the GNU General Public License as published by | |
607 | +# the Free Software Foundation; either version 2 of the License, or | |
608 | +# (at your option) any later version. | |
609 | +# | |
610 | +# This program is distributed in the hope that it will be useful, | |
611 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
612 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
613 | +# GNU General Public License for more details. | |
614 | +# | |
615 | +# You should have received a copy of the GNU General Public License | |
616 | +# along with this program; if not, write to the Free Software | |
617 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
618 | + | |
619 | +Basic Aufs Internal Structure | |
620 | + | |
621 | +Superblock/Inode/Dentry/File Objects | |
622 | +---------------------------------------------------------------------- | |
623 | +As like an ordinary filesystem, aufs has its own | |
624 | +superblock/inode/dentry/file objects. All these objects have a | |
625 | +dynamically allocated array and store the same kind of pointers to the | |
626 | +lower filesystem, branch. | |
627 | +For example, when you build a union with one readwrite branch and one | |
628 | +readonly, mounted /au, /rw and /ro respectively. | |
629 | +- /au = /rw + /ro | |
630 | +- /ro/fileA exists but /rw/fileA | |
631 | + | |
632 | +Aufs lookup operation finds /ro/fileA and gets dentry for that. These | |
633 | +pointers are stored in a aufs dentry. The array in aufs dentry will be, | |
634 | +- [0] = NULL | |
635 | +- [1] = /ro/fileA | |
636 | + | |
637 | +This style of an array is essentially same to the aufs | |
638 | +superblock/inode/dentry/file objects. | |
639 | + | |
640 | +Because aufs supports manipulating branches, ie. add/delete/change | |
641 | +dynamically, these objects has its own generation. When branches are | |
642 | +changed, the generation in aufs superblock is incremented. And a | |
643 | +generation in other object are compared when it is accessed. | |
644 | +When a generation in other objects are obsoleted, aufs refreshes the | |
645 | +internal array. | |
646 | + | |
647 | + | |
648 | +Superblock | |
649 | +---------------------------------------------------------------------- | |
650 | +Additionally aufs superblock has some data for policies to select one | |
651 | +among multiple writable branches, XIB files, pseudo-links and kobject. | |
652 | +See below in detail. | |
653 | +About the policies which supports copy-down a directory, see policy.txt | |
654 | +too. | |
655 | + | |
656 | + | |
657 | +Branch and XINO(External Inode Number Translation Table) | |
658 | +---------------------------------------------------------------------- | |
659 | +Every branch has its own xino (external inode number translation table) | |
660 | +file. The xino file is created and unlinked by aufs internally. When two | |
661 | +members of a union exist on the same filesystem, they share the single | |
662 | +xino file. | |
663 | +The struct of a xino file is simple, just a sequence of aufs inode | |
664 | +numbers which is indexed by the lower inode number. | |
665 | +In the above sample, assume the inode number of /ro/fileA is i111 and | |
666 | +aufs assigns the inode number i999 for fileA. Then aufs writes 999 as | |
667 | +4(8) bytes at 111 * 4(8) bytes offset in the xino file. | |
668 | + | |
669 | +When the inode numbers are not contiguous, the xino file will be sparse | |
670 | +which has a hole in it and doesn't consume as much disk space as it | |
671 | +might appear. If your branch filesystem consumes disk space for such | |
672 | +holes, then you should specify 'xino=' option at mounting aufs. | |
673 | + | |
674 | +Also a writable branch has three kinds of "whiteout bases". All these | |
675 | +are existed when the branch is joined to aufs and the names are | |
676 | +whiteout-ed doubly, so that users will never see their names in aufs | |
677 | +hierarchy. | |
678 | +1. a regular file which will be linked to all whiteouts. | |
679 | +2. a directory to store a pseudo-link. | |
680 | +3. a directory to store an "orphan-ed" file temporary. | |
681 | + | |
682 | +1. Whiteout Base | |
683 | + When you remove a file on a readonly branch, aufs handles it as a | |
684 | + logical deletion and creates a whiteout on the upper writable branch | |
685 | + as a hardlink of this file in order not to consume inode on the | |
686 | + writable branch. | |
687 | +2. Pseudo-link Dir | |
688 | + See below, Pseudo-link. | |
689 | +3. Step-Parent Dir | |
690 | + When "fileC" exists on the lower readonly branch only and it is | |
691 | + opened and removed with its parent dir, and then user writes | |
692 | + something into it, then aufs copies-up fileC to this | |
693 | + directory. Because there is no other dir to store fileC. After | |
694 | + creating a file under this dir, the file is unlinked. | |
695 | + | |
696 | +Because aufs supports manipulating branches, ie. add/delete/change | |
697 | +dynamically, a branch has its own id. When the branch order changes, aufs | |
698 | +finds the new index by searching the branch id. | |
699 | + | |
700 | + | |
701 | +Pseudo-link | |
702 | +---------------------------------------------------------------------- | |
703 | +Assume "fileA" exists on the lower readonly branch only and it is | |
704 | +hardlinked to "fileB" on the branch. When you write something to fileA, | |
705 | +aufs copies-up it to the upper writable branch. Additionally aufs | |
706 | +creates a hardlink under the Pseudo-link Directory of the writable | |
707 | +branch. The inode of a pseudo-link is kept in aufs super_block as a | |
708 | +simple list. If fileB is read after unlinking fileA, aufs returns | |
709 | +filedata from the pseudo-link instead of the lower readonly | |
710 | +branch. Because the pseudo-link is based upon the inode, to keep the | |
711 | +inode number by xino (see above) is important. | |
712 | + | |
713 | +All the hardlinks under the Pseudo-link Directory of the writable branch | |
714 | +should be restored in a proper location later. Aufs provides a utility | |
715 | +to do this. The userspace helpers executed at remounting and unmounting | |
716 | +aufs by default. | |
717 | +During this utility is running, it puts aufs into the pseudo-link | |
718 | +maintenance mode. In this mode, only the process which began the | |
719 | +maintenance mode (and its child processes) is allowed to operate in | |
720 | +aufs. Some other processes which are not related to the pseudo-link will | |
721 | +be allowed to run too, but the rest have to return an error or wait | |
722 | +until the maintenance mode ends. If a process already acquires an inode | |
723 | +mutex (in VFS), it has to return an error. | |
724 | + | |
725 | + | |
726 | +XIB(external inode number bitmap) | |
727 | +---------------------------------------------------------------------- | |
728 | +Addition to the xino file per a branch, aufs has an external inode number | |
729 | +bitmap in a superblock object. It is also a file such like a xino file. | |
730 | +It is a simple bitmap to mark whether the aufs inode number is in-use or | |
731 | +not. | |
732 | +To reduce the file I/O, aufs prepares a single memory page to cache xib. | |
733 | + | |
734 | +Aufs implements a feature to truncate/refresh both of xino and xib to | |
735 | +reduce the number of consumed disk blocks for these files. | |
736 | + | |
737 | + | |
738 | +Virtual or Vertical Dir, and Readdir in Userspace | |
739 | +---------------------------------------------------------------------- | |
740 | +In order to support multiple layers (branches), aufs readdir operation | |
741 | +constructs a virtual dir block on memory. For readdir, aufs calls | |
742 | +vfs_readdir() internally for each dir on branches, merges their entries | |
743 | +with eliminating the whiteout-ed ones, and sets it to file (dir) | |
744 | +object. So the file object has its entry list until it is closed. The | |
745 | +entry list will be updated when the file position is zero and becomes | |
746 | +old. This decision is made in aufs automatically. | |
747 | + | |
748 | +The dynamically allocated memory block for the name of entries has a | |
749 | +unit of 512 bytes (by default) and stores the names contiguously (no | |
750 | +padding). Another block for each entry is handled by kmem_cache too. | |
751 | +During building dir blocks, aufs creates hash list and judging whether | |
752 | +the entry is whiteouted by its upper branch or already listed. | |
753 | +The merged result is cached in the corresponding inode object and | |
754 | +maintained by a customizable life-time option. | |
755 | + | |
756 | +Some people may call it can be a security hole or invite DoS attack | |
757 | +since the opened and once readdir-ed dir (file object) holds its entry | |
758 | +list and becomes a pressure for system memory. But I'd say it is similar | |
759 | +to files under /proc or /sys. The virtual files in them also holds a | |
760 | +memory page (generally) while they are opened. When an idea to reduce | |
761 | +memory for them is introduced, it will be applied to aufs too. | |
762 | +For those who really hate this situation, I've developed readdir(3) | |
763 | +library which operates this merging in userspace. You just need to set | |
764 | +LD_PRELOAD environment variable, and aufs will not consume no memory in | |
765 | +kernel space for readdir(3). | |
766 | + | |
767 | + | |
768 | +Workqueue | |
769 | +---------------------------------------------------------------------- | |
770 | +Aufs sometimes requires privilege access to a branch. For instance, | |
771 | +in copy-up/down operation. When a user process is going to make changes | |
772 | +to a file which exists in the lower readonly branch only, and the mode | |
773 | +of one of ancestor directories may not be writable by a user | |
774 | +process. Here aufs copy-up the file with its ancestors and they may | |
775 | +require privilege to set its owner/group/mode/etc. | |
776 | +This is a typical case of a application character of aufs (see | |
777 | +Introduction). | |
778 | + | |
779 | +Aufs uses workqueue synchronously for this case. It creates its own | |
780 | +workqueue. The workqueue is a kernel thread and has privilege. Aufs | |
781 | +passes the request to call mkdir or write (for example), and wait for | |
782 | +its completion. This approach solves a problem of a signal handler | |
783 | +simply. | |
784 | +If aufs didn't adopt the workqueue and changed the privilege of the | |
785 | +process, and if the mkdir/write call arises SIGXFSZ or other signal, | |
786 | +then the user process might gain a privilege or the generated core file | |
787 | +was owned by a superuser. | |
788 | + | |
789 | +Also aufs uses the system global workqueue ("events" kernel thread) too | |
790 | +for asynchronous tasks, such like handling inotify/fsnotify, re-creating a | |
791 | +whiteout base and etc. This is unrelated to a privilege. | |
792 | +Most of aufs operation tries acquiring a rw_semaphore for aufs | |
793 | +superblock at the beginning, at the same time waits for the completion | |
794 | +of all queued asynchronous tasks. | |
795 | + | |
796 | + | |
797 | +Whiteout | |
798 | +---------------------------------------------------------------------- | |
799 | +The whiteout in aufs is very similar to Unionfs's. That is represented | |
800 | +by its filename. UnionMount takes an approach of a file mode, but I am | |
801 | +afraid several utilities (find(1) or something) will have to support it. | |
802 | + | |
803 | +Basically the whiteout represents "logical deletion" which stops aufs to | |
804 | +lookup further, but also it represents "dir is opaque" which also stop | |
805 | +lookup. | |
806 | + | |
807 | +In aufs, rmdir(2) and rename(2) for dir uses whiteout alternatively. | |
808 | +In order to make several functions in a single systemcall to be | |
809 | +revertible, aufs adopts an approach to rename a directory to a temporary | |
810 | +unique whiteouted name. | |
811 | +For example, in rename(2) dir where the target dir already existed, aufs | |
812 | +renames the target dir to a temporary unique whiteouted name before the | |
813 | +actual rename on a branch and then handles other actions (make it opaque, | |
814 | +update the attributes, etc). If an error happens in these actions, aufs | |
815 | +simply renames the whiteouted name back and returns an error. If all are | |
816 | +succeeded, aufs registers a function to remove the whiteouted unique | |
817 | +temporary name completely and asynchronously to the system global | |
818 | +workqueue. | |
819 | + | |
820 | + | |
821 | +Copy-up | |
822 | +---------------------------------------------------------------------- | |
823 | +It is a well-known feature or concept. | |
824 | +When user modifies a file on a readonly branch, aufs operate "copy-up" | |
825 | +internally and makes change to the new file on the upper writable branch. | |
826 | +When the trigger systemcall does not update the timestamps of the parent | |
827 | +dir, aufs reverts it after copy-up. | |
828 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt linux/Documentation/filesystems/aufs/design/03lookup.txt | |
829 | --- /usr/share/empty/Documentation/filesystems/aufs/design/03lookup.txt 1970-01-01 01:00:00.000000000 +0100 | |
830 | +++ linux/Documentation/filesystems/aufs/design/03lookup.txt 2011-08-24 13:30:24.727980364 +0200 | |
831 | @@ -0,0 +1,106 @@ | |
832 | + | |
833 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
834 | +# | |
835 | +# This program is free software; you can redistribute it and/or modify | |
836 | +# it under the terms of the GNU General Public License as published by | |
837 | +# the Free Software Foundation; either version 2 of the License, or | |
838 | +# (at your option) any later version. | |
839 | +# | |
840 | +# This program is distributed in the hope that it will be useful, | |
841 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
842 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
843 | +# GNU General Public License for more details. | |
844 | +# | |
845 | +# You should have received a copy of the GNU General Public License | |
846 | +# along with this program; if not, write to the Free Software | |
847 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
848 | + | |
849 | +Lookup in a Branch | |
850 | +---------------------------------------------------------------------- | |
851 | +Since aufs has a character of sub-VFS (see Introduction), it operates | |
852 | +lookup for branches as VFS does. It may be a heavy work. Generally | |
853 | +speaking struct nameidata is a bigger structure and includes many | |
854 | +information. But almost all lookup operation in aufs is the simplest | |
855 | +case, ie. lookup only an entry directly connected to its parent. Digging | |
856 | +down the directory hierarchy is unnecessary. | |
857 | + | |
858 | +VFS has a function lookup_one_len() for that use, but it is not usable | |
859 | +for a branch filesystem which requires struct nameidata. So aufs | |
860 | +implements a simple lookup wrapper function. When a branch filesystem | |
861 | +allows NULL as nameidata, it calls lookup_one_len(). Otherwise it builds | |
862 | +a simplest nameidata and calls lookup_hash(). | |
863 | +Here aufs applies "a principle in NFSD", ie. if the filesystem supports | |
864 | +NFS-export, then it has to support NULL as a nameidata parameter for | |
865 | +->create(), ->lookup() and ->d_revalidate(). So the lookup wrapper in | |
866 | +aufs tests if ->s_export_op in the branch is NULL or not. | |
867 | + | |
868 | +When a branch is a remote filesystem, aufs basically trusts its | |
869 | +->d_revalidate(), also aufs forces the hardest revalidate tests for | |
870 | +them. | |
871 | +For d_revalidate, aufs implements three levels of revalidate tests. See | |
872 | +"Revalidate Dentry and UDBA" in detail. | |
873 | + | |
874 | + | |
875 | +Loopback Mount | |
876 | +---------------------------------------------------------------------- | |
877 | +Basically aufs supports any type of filesystem and block device for a | |
878 | +branch (actually there are some exceptions). But it is prohibited to add | |
879 | +a loopback mounted one whose backend file exists in a filesystem which is | |
880 | +already added to aufs. The reason is to protect aufs from a recursive | |
881 | +lookup. If it was allowed, the aufs lookup operation might re-enter a | |
882 | +lookup for the loopback mounted branch in the same context, and will | |
883 | +cause a deadlock. | |
884 | + | |
885 | + | |
886 | +Revalidate Dentry and UDBA (User's Direct Branch Access) | |
887 | +---------------------------------------------------------------------- | |
888 | +Generally VFS helpers re-validate a dentry as a part of lookup. | |
889 | +0. digging down the directory hierarchy. | |
890 | +1. lock the parent dir by its i_mutex. | |
891 | +2. lookup the final (child) entry. | |
892 | +3. revalidate it. | |
893 | +4. call the actual operation (create, unlink, etc.) | |
894 | +5. unlock the parent dir | |
895 | + | |
896 | +If the filesystem implements its ->d_revalidate() (step 3), then it is | |
897 | +called. Actually aufs implements it and checks the dentry on a branch is | |
898 | +still valid. | |
899 | +But it is not enough. Because aufs has to release the lock for the | |
900 | +parent dir on a branch at the end of ->lookup() (step 2) and | |
901 | +->d_revalidate() (step 3) while the i_mutex of the aufs dir is still | |
902 | +held by VFS. | |
903 | +If the file on a branch is changed directly, eg. bypassing aufs, after | |
904 | +aufs released the lock, then the subsequent operation may cause | |
905 | +something unpleasant result. | |
906 | + | |
907 | +This situation is a result of VFS architecture, ->lookup() and | |
908 | +->d_revalidate() is separated. But I never say it is wrong. It is a good | |
909 | +design from VFS's point of view. It is just not suitable for sub-VFS | |
910 | +character in aufs. | |
911 | + | |
912 | +Aufs supports such case by three level of revalidation which is | |
913 | +selectable by user. | |
914 | +1. Simple Revalidate | |
915 | + Addition to the native flow in VFS's, confirm the child-parent | |
916 | + relationship on the branch just after locking the parent dir on the | |
917 | + branch in the "actual operation" (step 4). When this validation | |
918 | + fails, aufs returns EBUSY. ->d_revalidate() (step 3) in aufs still | |
919 | + checks the validation of the dentry on branches. | |
920 | +2. Monitor Changes Internally by Inotify/Fsnotify | |
921 | + Addition to above, in the "actual operation" (step 4) aufs re-lookup | |
922 | + the dentry on the branch, and returns EBUSY if it finds different | |
923 | + dentry. | |
924 | + Additionally, aufs sets the inotify/fsnotify watch for every dir on branches | |
925 | + during it is in cache. When the event is notified, aufs registers a | |
926 | + function to kernel 'events' thread by schedule_work(). And the | |
927 | + function sets some special status to the cached aufs dentry and inode | |
928 | + private data. If they are not cached, then aufs has nothing to | |
929 | + do. When the same file is accessed through aufs (step 0-3) later, | |
930 | + aufs will detect the status and refresh all necessary data. | |
931 | + In this mode, aufs has to ignore the event which is fired by aufs | |
932 | + itself. | |
933 | +3. No Extra Validation | |
934 | + This is the simplest test and doesn't add any additional revalidation | |
935 | + test, and skip therevalidatin in step 4. It is useful and improves | |
936 | + aufs performance when system surely hide the aufs branches from user, | |
937 | + by over-mounting something (or another method). | |
938 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt linux/Documentation/filesystems/aufs/design/04branch.txt | |
939 | --- /usr/share/empty/Documentation/filesystems/aufs/design/04branch.txt 1970-01-01 01:00:00.000000000 +0100 | |
940 | +++ linux/Documentation/filesystems/aufs/design/04branch.txt 2011-08-24 13:30:24.727980364 +0200 | |
941 | @@ -0,0 +1,76 @@ | |
942 | + | |
943 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
944 | +# | |
945 | +# This program is free software; you can redistribute it and/or modify | |
946 | +# it under the terms of the GNU General Public License as published by | |
947 | +# the Free Software Foundation; either version 2 of the License, or | |
948 | +# (at your option) any later version. | |
949 | +# | |
950 | +# This program is distributed in the hope that it will be useful, | |
951 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
952 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
953 | +# GNU General Public License for more details. | |
954 | +# | |
955 | +# You should have received a copy of the GNU General Public License | |
956 | +# along with this program; if not, write to the Free Software | |
957 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
958 | + | |
959 | +Branch Manipulation | |
960 | + | |
961 | +Since aufs supports dynamic branch manipulation, ie. add/remove a branch | |
962 | +and changing its permission/attribute, there are a lot of works to do. | |
963 | + | |
964 | + | |
965 | +Add a Branch | |
966 | +---------------------------------------------------------------------- | |
967 | +o Confirm the adding dir exists outside of aufs, including loopback | |
968 | + mount. | |
969 | +- and other various attributes... | |
970 | +o Initialize the xino file and whiteout bases if necessary. | |
971 | + See struct.txt. | |
972 | + | |
973 | +o Check the owner/group/mode of the directory | |
974 | + When the owner/group/mode of the adding directory differs from the | |
975 | + existing branch, aufs issues a warning because it may impose a | |
976 | + security risk. | |
977 | + For example, when a upper writable branch has a world writable empty | |
978 | + top directory, a malicious user can create any files on the writable | |
979 | + branch directly, like copy-up and modify manually. If something like | |
980 | + /etc/{passwd,shadow} exists on the lower readonly branch but the upper | |
981 | + writable branch, and the writable branch is world-writable, then a | |
982 | + malicious guy may create /etc/passwd on the writable branch directly | |
983 | + and the infected file will be valid in aufs. | |
984 | + I am afraid it can be a security issue, but nothing to do except | |
985 | + producing a warning. | |
986 | + | |
987 | + | |
988 | +Delete a Branch | |
989 | +---------------------------------------------------------------------- | |
990 | +o Confirm the deleting branch is not busy | |
991 | + To be general, there is one merit to adopt "remount" interface to | |
992 | + manipulate branches. It is to discard caches. At deleting a branch, | |
993 | + aufs checks the still cached (and connected) dentries and inodes. If | |
994 | + there are any, then they are all in-use. An inode without its | |
995 | + corresponding dentry can be alive alone (for example, inotify/fsnotify case). | |
996 | + | |
997 | + For the cached one, aufs checks whether the same named entry exists on | |
998 | + other branches. | |
999 | + If the cached one is a directory, because aufs provides a merged view | |
1000 | + to users, as long as one dir is left on any branch aufs can show the | |
1001 | + dir to users. In this case, the branch can be removed from aufs. | |
1002 | + Otherwise aufs rejects deleting the branch. | |
1003 | + | |
1004 | + If any file on the deleting branch is opened by aufs, then aufs | |
1005 | + rejects deleting. | |
1006 | + | |
1007 | + | |
1008 | +Modify the Permission of a Branch | |
1009 | +---------------------------------------------------------------------- | |
1010 | +o Re-initialize or remove the xino file and whiteout bases if necessary. | |
1011 | + See struct.txt. | |
1012 | + | |
1013 | +o rw --> ro: Confirm the modifying branch is not busy | |
1014 | + Aufs rejects the request if any of these conditions are true. | |
1015 | + - a file on the branch is mmap-ed. | |
1016 | + - a regular file on the branch is opened for write and there is no | |
1017 | + same named entry on the upper branch. | |
1018 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt linux/Documentation/filesystems/aufs/design/05wbr_policy.txt | |
1019 | --- /usr/share/empty/Documentation/filesystems/aufs/design/05wbr_policy.txt 1970-01-01 01:00:00.000000000 +0100 | |
1020 | +++ linux/Documentation/filesystems/aufs/design/05wbr_policy.txt 2011-08-24 13:30:24.727980364 +0200 | |
1021 | @@ -0,0 +1,65 @@ | |
1022 | + | |
1023 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
1024 | +# | |
1025 | +# This program is free software; you can redistribute it and/or modify | |
1026 | +# it under the terms of the GNU General Public License as published by | |
1027 | +# the Free Software Foundation; either version 2 of the License, or | |
1028 | +# (at your option) any later version. | |
1029 | +# | |
1030 | +# This program is distributed in the hope that it will be useful, | |
1031 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1032 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1033 | +# GNU General Public License for more details. | |
1034 | +# | |
1035 | +# You should have received a copy of the GNU General Public License | |
1036 | +# along with this program; if not, write to the Free Software | |
1037 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1038 | + | |
1039 | +Policies to Select One among Multiple Writable Branches | |
1040 | +---------------------------------------------------------------------- | |
1041 | +When the number of writable branch is more than one, aufs has to decide | |
1042 | +the target branch for file creation or copy-up. By default, the highest | |
1043 | +writable branch which has the parent (or ancestor) dir of the target | |
1044 | +file is chosen (top-down-parent policy). | |
1045 | +By user's request, aufs implements some other policies to select the | |
1046 | +writable branch, for file creation two policies, round-robin and | |
1047 | +most-free-space policies. For copy-up three policies, top-down-parent, | |
1048 | +bottom-up-parent and bottom-up policies. | |
1049 | + | |
1050 | +As expected, the round-robin policy selects the branch in circular. When | |
1051 | +you have two writable branches and creates 10 new files, 5 files will be | |
1052 | +created for each branch. mkdir(2) systemcall is an exception. When you | |
1053 | +create 10 new directories, all will be created on the same branch. | |
1054 | +And the most-free-space policy selects the one which has most free | |
1055 | +space among the writable branches. The amount of free space will be | |
1056 | +checked by aufs internally, and users can specify its time interval. | |
1057 | + | |
1058 | +The policies for copy-up is more simple, | |
1059 | +top-down-parent is equivalent to the same named on in create policy, | |
1060 | +bottom-up-parent selects the writable branch where the parent dir | |
1061 | +exists and the nearest upper one from the copyup-source, | |
1062 | +bottom-up selects the nearest upper writable branch from the | |
1063 | +copyup-source, regardless the existence of the parent dir. | |
1064 | + | |
1065 | +There are some rules or exceptions to apply these policies. | |
1066 | +- If there is a readonly branch above the policy-selected branch and | |
1067 | + the parent dir is marked as opaque (a variation of whiteout), or the | |
1068 | + target (creating) file is whiteout-ed on the upper readonly branch, | |
1069 | + then the result of the policy is ignored and the target file will be | |
1070 | + created on the nearest upper writable branch than the readonly branch. | |
1071 | +- If there is a writable branch above the policy-selected branch and | |
1072 | + the parent dir is marked as opaque or the target file is whiteouted | |
1073 | + on the branch, then the result of the policy is ignored and the target | |
1074 | + file will be created on the highest one among the upper writable | |
1075 | + branches who has diropq or whiteout. In case of whiteout, aufs removes | |
1076 | + it as usual. | |
1077 | +- link(2) and rename(2) systemcalls are exceptions in every policy. | |
1078 | + They try selecting the branch where the source exists as possible | |
1079 | + since copyup a large file will take long time. If it can't be, | |
1080 | + ie. the branch where the source exists is readonly, then they will | |
1081 | + follow the copyup policy. | |
1082 | +- There is an exception for rename(2) when the target exists. | |
1083 | + If the rename target exists, aufs compares the index of the branches | |
1084 | + where the source and the target exists and selects the higher | |
1085 | + one. If the selected branch is readonly, then aufs follows the | |
1086 | + copyup policy. | |
1087 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt linux/Documentation/filesystems/aufs/design/06mmap.txt | |
1088 | --- /usr/share/empty/Documentation/filesystems/aufs/design/06mmap.txt 1970-01-01 01:00:00.000000000 +0100 | |
1089 | +++ linux/Documentation/filesystems/aufs/design/06mmap.txt 2011-08-24 13:30:24.727980364 +0200 | |
1090 | @@ -0,0 +1,47 @@ | |
1091 | + | |
1092 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
1093 | +# | |
1094 | +# This program is free software; you can redistribute it and/or modify | |
1095 | +# it under the terms of the GNU General Public License as published by | |
1096 | +# the Free Software Foundation; either version 2 of the License, or | |
1097 | +# (at your option) any later version. | |
1098 | +# | |
1099 | +# This program is distributed in the hope that it will be useful, | |
1100 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1101 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1102 | +# GNU General Public License for more details. | |
1103 | +# | |
1104 | +# You should have received a copy of the GNU General Public License | |
1105 | +# along with this program; if not, write to the Free Software | |
1106 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1107 | + | |
1108 | +mmap(2) -- File Memory Mapping | |
1109 | +---------------------------------------------------------------------- | |
1110 | +In aufs, the file-mapped pages are handled by a branch fs directly, no | |
1111 | +interaction with aufs. It means aufs_mmap() calls the branch fs's | |
1112 | +->mmap(). | |
1113 | +This approach is simple and good, but there is one problem. | |
1114 | +Under /proc, several entries show the mmap-ped files by its path (with | |
1115 | +device and inode number), and the printed path will be the path on the | |
1116 | +branch fs's instead of virtual aufs's. | |
1117 | +This is not a problem in most cases, but some utilities lsof(1) (and its | |
1118 | +user) may expect the path on aufs. | |
1119 | + | |
1120 | +To address this issue, aufs adds a new member called vm_prfile in struct | |
1121 | +vm_area_struct (and struct vm_region). The original vm_file points to | |
1122 | +the file on the branch fs in order to handle everything correctly as | |
1123 | +usual. The new vm_prfile points to a virtual file in aufs, and the | |
1124 | +show-functions in procfs refers to vm_prfile if it is set. | |
1125 | +Also we need to maintain several other places where touching vm_file | |
1126 | +such like | |
1127 | +- fork()/clone() copies vma and the reference count of vm_file is | |
1128 | + incremented. | |
1129 | +- merging vma maintains the ref count too. | |
1130 | + | |
1131 | +This is not a good approach. It just faking the printed path. But it | |
1132 | +leaves all behaviour around f_mapping unchanged. This is surely an | |
1133 | +advantage. | |
1134 | +Actually aufs had adopted another complicated approach which calls | |
1135 | +generic_file_mmap() and handles struct vm_operations_struct. In this | |
1136 | +approach, aufs met a hard problem and I could not solve it without | |
1137 | +switching the approach. | |
1138 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt linux/Documentation/filesystems/aufs/design/07export.txt | |
1139 | --- /usr/share/empty/Documentation/filesystems/aufs/design/07export.txt 1970-01-01 01:00:00.000000000 +0100 | |
1140 | +++ linux/Documentation/filesystems/aufs/design/07export.txt 2011-08-24 13:30:24.727980364 +0200 | |
1141 | @@ -0,0 +1,59 @@ | |
1142 | + | |
1143 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
1144 | +# | |
1145 | +# This program is free software; you can redistribute it and/or modify | |
1146 | +# it under the terms of the GNU General Public License as published by | |
1147 | +# the Free Software Foundation; either version 2 of the License, or | |
1148 | +# (at your option) any later version. | |
1149 | +# | |
1150 | +# This program is distributed in the hope that it will be useful, | |
1151 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1152 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1153 | +# GNU General Public License for more details. | |
1154 | +# | |
1155 | +# You should have received a copy of the GNU General Public License | |
1156 | +# along with this program; if not, write to the Free Software | |
1157 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1158 | + | |
1159 | +Export Aufs via NFS | |
1160 | +---------------------------------------------------------------------- | |
1161 | +Here is an approach. | |
1162 | +- like xino/xib, add a new file 'xigen' which stores aufs inode | |
1163 | + generation. | |
1164 | +- iget_locked(): initialize aufs inode generation for a new inode, and | |
1165 | + store it in xigen file. | |
1166 | +- destroy_inode(): increment aufs inode generation and store it in xigen | |
1167 | + file. it is necessary even if it is not unlinked, because any data of | |
1168 | + inode may be changed by UDBA. | |
1169 | +- encode_fh(): for a root dir, simply return FILEID_ROOT. otherwise | |
1170 | + build file handle by | |
1171 | + + branch id (4 bytes) | |
1172 | + + superblock generation (4 bytes) | |
1173 | + + inode number (4 or 8 bytes) | |
1174 | + + parent dir inode number (4 or 8 bytes) | |
1175 | + + inode generation (4 bytes)) | |
1176 | + + return value of exportfs_encode_fh() for the parent on a branch (4 | |
1177 | + bytes) | |
1178 | + + file handle for a branch (by exportfs_encode_fh()) | |
1179 | +- fh_to_dentry(): | |
1180 | + + find the index of a branch from its id in handle, and check it is | |
1181 | + still exist in aufs. | |
1182 | + + 1st level: get the inode number from handle and search it in cache. | |
1183 | + + 2nd level: if not found, get the parent inode number from handle and | |
1184 | + search it in cache. and then open the parent dir, find the matching | |
1185 | + inode number by vfs_readdir() and get its name, and call | |
1186 | + lookup_one_len() for the target dentry. | |
1187 | + + 3rd level: if the parent dir is not cached, call | |
1188 | + exportfs_decode_fh() for a branch and get the parent on a branch, | |
1189 | + build a pathname of it, convert it a pathname in aufs, call | |
1190 | + path_lookup(). now aufs gets a parent dir dentry, then handle it as | |
1191 | + the 2nd level. | |
1192 | + + to open the dir, aufs needs struct vfsmount. aufs keeps vfsmount | |
1193 | + for every branch, but not itself. to get this, (currently) aufs | |
1194 | + searches in current->nsproxy->mnt_ns list. it may not be a good | |
1195 | + idea, but I didn't get other approach. | |
1196 | + + test the generation of the gotten inode. | |
1197 | +- every inode operation: they may get EBUSY due to UDBA. in this case, | |
1198 | + convert it into ESTALE for NFSD. | |
1199 | +- readdir(): call lockdep_on/off() because filldir in NFSD calls | |
1200 | + lookup_one_len(), vfs_getattr(), encode_fh() and others. | |
1201 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt linux/Documentation/filesystems/aufs/design/08shwh.txt | |
1202 | --- /usr/share/empty/Documentation/filesystems/aufs/design/08shwh.txt 1970-01-01 01:00:00.000000000 +0100 | |
1203 | +++ linux/Documentation/filesystems/aufs/design/08shwh.txt 2011-08-24 13:30:24.727980364 +0200 | |
1204 | @@ -0,0 +1,53 @@ | |
1205 | + | |
1206 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
1207 | +# | |
1208 | +# This program is free software; you can redistribute it and/or modify | |
1209 | +# it under the terms of the GNU General Public License as published by | |
1210 | +# the Free Software Foundation; either version 2 of the License, or | |
1211 | +# (at your option) any later version. | |
1212 | +# | |
1213 | +# This program is distributed in the hope that it will be useful, | |
1214 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1215 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1216 | +# GNU General Public License for more details. | |
1217 | +# | |
1218 | +# You should have received a copy of the GNU General Public License | |
1219 | +# along with this program; if not, write to the Free Software | |
1220 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1221 | + | |
1222 | +Show Whiteout Mode (shwh) | |
1223 | +---------------------------------------------------------------------- | |
1224 | +Generally aufs hides the name of whiteouts. But in some cases, to show | |
1225 | +them is very useful for users. For instance, creating a new middle layer | |
1226 | +(branch) by merging existing layers. | |
1227 | + | |
1228 | +(borrowing aufs1 HOW-TO from a user, Michael Towers) | |
1229 | +When you have three branches, | |
1230 | +- Bottom: 'system', squashfs (underlying base system), read-only | |
1231 | +- Middle: 'mods', squashfs, read-only | |
1232 | +- Top: 'overlay', ram (tmpfs), read-write | |
1233 | + | |
1234 | +The top layer is loaded at boot time and saved at shutdown, to preserve | |
1235 | +the changes made to the system during the session. | |
1236 | +When larger changes have been made, or smaller changes have accumulated, | |
1237 | +the size of the saved top layer data grows. At this point, it would be | |
1238 | +nice to be able to merge the two overlay branches ('mods' and 'overlay') | |
1239 | +and rewrite the 'mods' squashfs, clearing the top layer and thus | |
1240 | +restoring save and load speed. | |
1241 | + | |
1242 | +This merging is simplified by the use of another aufs mount, of just the | |
1243 | +two overlay branches using the 'shwh' option. | |
1244 | +# mount -t aufs -o ro,shwh,br:/livesys/overlay=ro+wh:/livesys/mods=rr+wh \ | |
1245 | + aufs /livesys/merge_union | |
1246 | + | |
1247 | +A merged view of these two branches is then available at | |
1248 | +/livesys/merge_union, and the new feature is that the whiteouts are | |
1249 | +visible! | |
1250 | +Note that in 'shwh' mode the aufs mount must be 'ro', which will disable | |
1251 | +writing to all branches. Also the default mode for all branches is 'ro'. | |
1252 | +It is now possible to save the combined contents of the two overlay | |
1253 | +branches to a new squashfs, e.g.: | |
1254 | +# mksquashfs /livesys/merge_union /path/to/newmods.squash | |
1255 | + | |
1256 | +This new squashfs archive can be stored on the boot device and the | |
1257 | +initramfs will use it to replace the old one at the next boot. | |
1258 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt linux/Documentation/filesystems/aufs/design/10dynop.txt | |
1259 | --- /usr/share/empty/Documentation/filesystems/aufs/design/10dynop.txt 1970-01-01 01:00:00.000000000 +0100 | |
1260 | +++ linux/Documentation/filesystems/aufs/design/10dynop.txt 2011-08-24 13:30:24.727980364 +0200 | |
1261 | @@ -0,0 +1,47 @@ | |
1262 | + | |
1263 | +# Copyright (C) 2010-2011 Junjiro R. Okajima | |
1264 | +# | |
1265 | +# This program is free software; you can redistribute it and/or modify | |
1266 | +# it under the terms of the GNU General Public License as published by | |
1267 | +# the Free Software Foundation; either version 2 of the License, or | |
1268 | +# (at your option) any later version. | |
1269 | +# | |
1270 | +# This program is distributed in the hope that it will be useful, | |
1271 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1272 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1273 | +# GNU General Public License for more details. | |
1274 | +# | |
1275 | +# You should have received a copy of the GNU General Public License | |
1276 | +# along with this program; if not, write to the Free Software | |
1277 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1278 | + | |
1279 | +Dynamically customizable FS operations | |
1280 | +---------------------------------------------------------------------- | |
1281 | +Generally FS operations (struct inode_operations, struct | |
1282 | +address_space_operations, struct file_operations, etc.) are defined as | |
1283 | +"static const", but it never means that FS have only one set of | |
1284 | +operation. Some FS have multiple sets of them. For instance, ext2 has | |
1285 | +three sets, one for XIP, for NOBH, and for normal. | |
1286 | +Since aufs overrides and redirects these operations, sometimes aufs has | |
1287 | +to change its behaviour according to the branch FS type. More imporantly | |
1288 | +VFS acts differently if a function (member in the struct) is set or | |
1289 | +not. It means aufs should have several sets of operations and select one | |
1290 | +among them according to the branch FS definition. | |
1291 | + | |
1292 | +In order to solve this problem and not to affect the behavour of VFS, | |
1293 | +aufs defines these operations dynamically. For instance, aufs defines | |
1294 | +aio_read function for struct file_operations, but it may not be set to | |
1295 | +the file_operations. When the branch FS doesn't have it, aufs doesn't | |
1296 | +set it to its file_operations while the function definition itself is | |
1297 | +still alive. So the behaviour of io_submit(2) will not change, and it | |
1298 | +will return an error when aio_read is not defined. | |
1299 | + | |
1300 | +The lifetime of these dynamically generated operation object is | |
1301 | +maintained by aufs branch object. When the branch is removed from aufs, | |
1302 | +the reference counter of the object is decremented. When it reaches | |
1303 | +zero, the dynamically generated operation object will be freed. | |
1304 | + | |
1305 | +This approach is designed to support AIO (io_submit), Direcit I/O and | |
1306 | +XIP mainly. | |
1307 | +Currently this approach is applied to file_operations and | |
1308 | +vm_operations_struct for regular files only. | |
1309 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/design/99plan.txt linux/Documentation/filesystems/aufs/design/99plan.txt | |
1310 | --- /usr/share/empty/Documentation/filesystems/aufs/design/99plan.txt 1970-01-01 01:00:00.000000000 +0100 | |
1311 | +++ linux/Documentation/filesystems/aufs/design/99plan.txt 2011-08-24 13:30:24.727980364 +0200 | |
1312 | @@ -0,0 +1,96 @@ | |
1313 | + | |
1314 | +# Copyright (C) 2005-2011 Junjiro R. Okajima | |
1315 | +# | |
1316 | +# This program is free software; you can redistribute it and/or modify | |
1317 | +# it under the terms of the GNU General Public License as published by | |
1318 | +# the Free Software Foundation; either version 2 of the License, or | |
1319 | +# (at your option) any later version. | |
1320 | +# | |
1321 | +# This program is distributed in the hope that it will be useful, | |
1322 | +# but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1323 | +# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1324 | +# GNU General Public License for more details. | |
1325 | +# | |
1326 | +# You should have received a copy of the GNU General Public License | |
1327 | +# along with this program; if not, write to the Free Software | |
1328 | +# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1329 | + | |
1330 | +Plan | |
1331 | + | |
1332 | +Restoring some features which was implemented in aufs1. | |
1333 | +They were dropped in aufs2 in order to make source files simpler and | |
1334 | +easier to be reviewed. | |
1335 | + | |
1336 | + | |
1337 | +Test Only the Highest One for the Directory Permission (dirperm1 option) | |
1338 | +---------------------------------------------------------------------- | |
1339 | +Let's try case study. | |
1340 | +- aufs has two branches, upper readwrite and lower readonly. | |
1341 | + /au = /rw + /ro | |
1342 | +- "dirA" exists under /ro, but /rw. and its mode is 0700. | |
1343 | +- user invoked "chmod a+rx /au/dirA" | |
1344 | +- then "dirA" becomes world readable? | |
1345 | + | |
1346 | +In this case, /ro/dirA is still 0700 since it exists in readonly branch, | |
1347 | +or it may be a natively readonly filesystem. If aufs respects the lower | |
1348 | +branch, it should not respond readdir request from other users. But user | |
1349 | +allowed it by chmod. Should really aufs rejects showing the entries | |
1350 | +under /ro/dirA? | |
1351 | + | |
1352 | +To be honest, I don't have a best solution for this case. So I | |
1353 | +implemented 'dirperm1' and 'nodirperm1' option in aufs1, and leave it to | |
1354 | +users. | |
1355 | +When dirperm1 is specified, aufs checks only the highest one for the | |
1356 | +directory permission, and shows the entries. Otherwise, as usual, checks | |
1357 | +every dir existing on all branches and rejects the request. | |
1358 | + | |
1359 | +As a side effect, dirperm1 option improves the performance of aufs | |
1360 | +because the number of permission check is reduced. | |
1361 | + | |
1362 | + | |
1363 | +Being Another Aufs's Readonly Branch (robr) | |
1364 | +---------------------------------------------------------------------- | |
1365 | +Aufs1 allows aufs to be another aufs's readonly branch. | |
1366 | +This feature was developed by a user's request. But it may not be used | |
1367 | +currecnly. | |
1368 | + | |
1369 | + | |
1370 | +Copy-up on Open (coo=) | |
1371 | +---------------------------------------------------------------------- | |
1372 | +By default the internal copy-up is executed when it is really necessary. | |
1373 | +It is not done when a file is opened for writing, but when write(2) is | |
1374 | +done. Users who have many (over 100) branches want to know and analyse | |
1375 | +when and what file is copied-up. To insert a new upper branch which | |
1376 | +contains such files only may improve the performance of aufs. | |
1377 | + | |
1378 | +Aufs1 implemented "coo=none | leaf | all" option. | |
1379 | + | |
1380 | + | |
1381 | +Refresh the Opened File (refrof) | |
1382 | +---------------------------------------------------------------------- | |
1383 | +This option is implemented in aufs1 but incomplete. | |
1384 | + | |
1385 | +When user reads from a file, he expects to get its latest filedata | |
1386 | +generally. If the file is removed and a new same named file is created, | |
1387 | +the content he gets is unchanged, ie. the unlinked filedata. | |
1388 | + | |
1389 | +Let's try case study again. | |
1390 | +- aufs has two branches. | |
1391 | + /au = /rw + /ro | |
1392 | +- "fileA" exists under /ro, but /rw. | |
1393 | +- user opened "/au/fileA". | |
1394 | +- he or someone else inserts a branch (/new) between /rw and /ro. | |
1395 | + /au = /rw + /new + /ro | |
1396 | +- the new branch has "fileA". | |
1397 | +- user reads from the opened "fileA" | |
1398 | +- which filedata should aufs return, from /ro or /new? | |
1399 | + | |
1400 | +Some people says it has to be "from /ro" and it is a semantics of Unix. | |
1401 | +The others say it should be "from /new" because the file is not removed | |
1402 | +and it is equivalent to the case of someone else modifies the file. | |
1403 | + | |
1404 | +Here again I don't have a best and final answer. I got an idea to | |
1405 | +implement 'refrof' and 'norefrof' option. When 'refrof' (REFResh the | |
1406 | +Opened File) is specified (by default), aufs returns the filedata from | |
1407 | +/new. | |
1408 | +Otherwise from /new. | |
1409 | diff -urN /usr/share/empty/Documentation/filesystems/aufs/README linux/Documentation/filesystems/aufs/README | |
1410 | --- /usr/share/empty/Documentation/filesystems/aufs/README 1970-01-01 01:00:00.000000000 +0100 | |
1411 | +++ linux/Documentation/filesystems/aufs/README 2011-08-24 13:30:24.727980364 +0200 | |
1412 | @@ -0,0 +1,290 @@ | |
1413 | + | |
1414 | +Aufs3 -- advanced multi layered unification filesystem version 3.x | |
1415 | +http://aufs.sf.net | |
1416 | +Junjiro R. Okajima | |
1417 | + | |
1418 | + | |
1419 | +0. Introduction | |
1420 | +---------------------------------------- | |
1421 | +In the early days, aufs was entirely re-designed and re-implemented | |
1422 | +Unionfs Version 1.x series. After many original ideas, approaches, | |
1423 | +improvements and implementations, it becomes totally different from | |
1424 | +Unionfs while keeping the basic features. | |
1425 | +Recently, Unionfs Version 2.x series begin taking some of the same | |
1426 | +approaches to aufs1's. | |
1427 | +Unionfs is being developed by Professor Erez Zadok at Stony Brook | |
1428 | +University and his team. | |
1429 | + | |
1430 | +Aufs3 supports linux-3.0 and later. | |
1431 | +If you want older kernel version support, try aufs2-2.6.git or | |
1432 | +aufs2-standalone.git repository, aufs1 from CVS on SourceForge. | |
1433 | + | |
1434 | +Note: it becomes clear that "Aufs was rejected. Let's give it up." | |
1435 | +According to Christoph Hellwig, linux rejects all union-type filesystems | |
1436 | +but UnionMount. | |
1437 | +<http://marc.info/?l=linux-kernel&m=123938533724484&w=2> | |
1438 | + | |
1439 | + | |
1440 | +1. Features | |
1441 | +---------------------------------------- | |
1442 | +- unite several directories into a single virtual filesystem. The member | |
1443 | + directory is called as a branch. | |
1444 | +- you can specify the permission flags to the branch, which are 'readonly', | |
1445 | + 'readwrite' and 'whiteout-able.' | |
1446 | +- by upper writable branch, internal copyup and whiteout, files/dirs on | |
1447 | + readonly branch are modifiable logically. | |
1448 | +- dynamic branch manipulation, add, del. | |
1449 | +- etc... | |
1450 | + | |
1451 | +Also there are many enhancements in aufs1, such as: | |
1452 | +- readdir(3) in userspace. | |
1453 | +- keep inode number by external inode number table | |
1454 | +- keep the timestamps of file/dir in internal copyup operation | |
1455 | +- seekable directory, supporting NFS readdir. | |
1456 | +- whiteout is hardlinked in order to reduce the consumption of inodes | |
1457 | + on branch | |
1458 | +- do not copyup, nor create a whiteout when it is unnecessary | |
1459 | +- revert a single systemcall when an error occurs in aufs | |
1460 | +- remount interface instead of ioctl | |
1461 | +- maintain /etc/mtab by an external command, /sbin/mount.aufs. | |
1462 | +- loopback mounted filesystem as a branch | |
1463 | +- kernel thread for removing the dir who has a plenty of whiteouts | |
1464 | +- support copyup sparse file (a file which has a 'hole' in it) | |
1465 | +- default permission flags for branches | |
1466 | +- selectable permission flags for ro branch, whether whiteout can | |
1467 | + exist or not | |
1468 | +- export via NFS. | |
1469 | +- support <sysfs>/fs/aufs and <debugfs>/aufs. | |
1470 | +- support multiple writable branches, some policies to select one | |
1471 | + among multiple writable branches. | |
1472 | +- a new semantics for link(2) and rename(2) to support multiple | |
1473 | + writable branches. | |
1474 | +- no glibc changes are required. | |
1475 | +- pseudo hardlink (hardlink over branches) | |
1476 | +- allow a direct access manually to a file on branch, e.g. bypassing aufs. | |
1477 | + including NFS or remote filesystem branch. | |
1478 | +- userspace wrapper for pathconf(3)/fpathconf(3) with _PC_LINK_MAX. | |
1479 | +- and more... | |
1480 | + | |
1481 | +Currently these features are dropped temporary from aufs3. | |
1482 | +See design/08plan.txt in detail. | |
1483 | +- test only the highest one for the directory permission (dirperm1) | |
1484 | +- copyup on open (coo=) | |
1485 | +- nested mount, i.e. aufs as readonly no-whiteout branch of another aufs | |
1486 | + (robr) | |
1487 | +- statistics of aufs thread (/sys/fs/aufs/stat) | |
1488 | +- delegation mode (dlgt) | |
1489 | + a delegation of the internal branch access to support task I/O | |
1490 | + accounting, which also supports Linux Security Modules (LSM) mainly | |
1491 | + for Suse AppArmor. | |
1492 | +- intent.open/create (file open in a single lookup) | |
1493 | + | |
1494 | +Features or just an idea in the future (see also design/*.txt), | |
1495 | +- reorder the branch index without del/re-add. | |
1496 | +- permanent xino files for NFSD | |
1497 | +- an option for refreshing the opened files after add/del branches | |
1498 | +- 'move' policy for copy-up between two writable branches, after | |
1499 | + checking free space. | |
1500 | +- light version, without branch manipulation. (unnecessary?) | |
1501 | +- copyup in userspace | |
1502 | +- inotify in userspace | |
1503 | +- readv/writev | |
1504 | +- xattr, acl | |
1505 | + | |
1506 | + | |
1507 | +2. Download | |
1508 | +---------------------------------------- | |
1509 | +There were three GIT trees for aufs2, but for aufs3 two GIT trees, | |
1510 | +aufs3-standalone and aufs-util. Note that there is no "3" in "aufs-util." | |
1511 | +The aufs3-standalone tree has only aufs source files | |
1512 | +and necessary patches, and you can select CONFIG_AUFS_FS=m. | |
1513 | + | |
1514 | +You will find GIT branches whose name is in form of "aufs3.x" where "x" | |
1515 | +represents the linux kernel version, "linux-3.x". For instance, | |
1516 | +"aufs3.0" is for linux-3.0. | |
1517 | + | |
1518 | +o aufs3-standalone tree | |
1519 | +$ git clone git://aufs.git.sourceforge.net/gitroot/aufs/aufs3-standalone.git \ | |
1520 | + aufs3-standalone.git | |
1521 | +$ cd aufs3-standalone.git | |
1522 | +$ git checkout origin/aufs3.0 | |
1523 | + | |
1524 | +o aufs-util tree | |
1525 | +$ git clone git://aufs.git.sourceforge.net/gitroot/aufs/aufs-util.git \ | |
1526 | + aufs-util.git | |
1527 | +$ cd aufs-util.git | |
1528 | +$ git checkout origin/aufs3.0 | |
1529 | + | |
1530 | +You may not be able to find the GIT branch in aufs-util for your | |
1531 | +version. In this case, you should git-checkout the branch for the | |
1532 | +nearest lower number. | |
1533 | +If you are using linux-3.10 and aufs3.10 (which are not released yet), | |
1534 | +but the "aufs3.10" branch doesn't exit in this repository, then | |
1535 | +"aufs3.9", "aufs3.8", ... or something is the branch for you. | |
1536 | +Also you can view all branches by | |
1537 | + $ git branch -a | |
1538 | + | |
1539 | + | |
1540 | +3. Configuration and Compilation | |
1541 | +---------------------------------------- | |
1542 | +Make sure you have git-checkout'ed the correct branch. | |
1543 | + | |
1544 | +For aufs3-standalone tree, | |
1545 | +There are several ways to build. | |
1546 | + | |
1547 | +1. | |
1548 | +- apply ./aufs3-kbuild.patch to your kernel source files. | |
1549 | +- apply ./aufs3-base.patch too. | |
1550 | +- apply ./aufs3-proc_map.patch too, if you want to make /proc/PID/maps (and | |
1551 | + others including lsof(1)) show the file path on aufs instead of the | |
1552 | + path on the branch fs. | |
1553 | +- apply ./aufs3-standalone.patch too, if you have a plan to set | |
1554 | + CONFIG_AUFS_FS=m. otherwise you don't need ./aufs3-standalone.patch. | |
1555 | +- copy ./{Documentation,fs,include/linux/aufs_type.h} files to your | |
1556 | + kernel source tree. Never copy ./include/linux/Kbuild. | |
1557 | +- enable CONFIG_EXPERIMENTAL and CONFIG_AUFS_FS, you can select either | |
1558 | + =m or =y. | |
1559 | +- and build your kernel as usual. | |
1560 | +- install the built kernel. | |
1561 | +- install the header files too by "make headers_install". | |
1562 | +- and reboot your system. | |
1563 | + | |
1564 | +2. | |
1565 | +- module only (CONFIG_AUFS_FS=m). | |
1566 | +- apply ./aufs3-base.patch to your kernel source files. | |
1567 | +- apply ./aufs3-proc_map.patch too to your kernel source files, | |
1568 | + if you want to make /proc/PID/maps (and others including lsof(1)) show | |
1569 | + the file path on aufs instead of the path on the branch fs. | |
1570 | +- apply ./aufs3-standalone.patch too. | |
1571 | +- build your kernel, don't forget "make headers_install", and reboot. | |
1572 | +- edit ./config.mk and set other aufs configurations if necessary. | |
1573 | + Note: You should read ./fs/aufs/Kconfig carefully which describes | |
1574 | + every aufs configurations. | |
1575 | +- build the module by simple "make". | |
1576 | +- you can specify ${KDIR} make variable which points to your kernel | |
1577 | + source tree. | |
1578 | +- install the files | |
1579 | + + run "make install" to install the aufs module, or copy the built | |
1580 | + ./aufs.ko to /lib/modules/... and run depmod -a (or reboot simply). | |
1581 | + + run "make headers_install" to install the aufs header file (you can | |
1582 | + specify DESTDIR), or copty ./usr/include/linux/aufs_type.h to | |
1583 | + /usr/include/linux or wherever you like. | |
1584 | +- no need to apply aufs3-kbuild.patch, nor copying source files to your | |
1585 | + kernel source tree. | |
1586 | + | |
1587 | +Note: The haeder file aufs_type.h is necessary to build aufs-util | |
1588 | + as well as "make headers_install" in the kernel source tree. | |
1589 | + headers_install is subject to be forgotten, but it is essentially | |
1590 | + necessary, not only for building aufs-util. | |
1591 | + You may not meet problems without headers_install in some older | |
1592 | + version though. | |
1593 | + | |
1594 | +And then, | |
1595 | +- read README in aufs-util, build and install it | |
1596 | +- if you want to use readdir(3) in userspace or pathconf(3) wrapper, | |
1597 | + then run "make install_ulib" too. And refer to the aufs manual in | |
1598 | + detail. | |
1599 | + | |
1600 | + | |
1601 | +4. Usage | |
1602 | +---------------------------------------- | |
1603 | +At first, make sure aufs-util are installed, and please read the aufs | |
1604 | +manual, aufs.5 in aufs-util.git tree. | |
1605 | +$ man -l aufs.5 | |
1606 | + | |
1607 | +And then, | |
1608 | +$ mkdir /tmp/rw /tmp/aufs | |
1609 | +# mount -t aufs -o br=/tmp/rw:${HOME} none /tmp/aufs | |
1610 | + | |
1611 | +Here is another example. The result is equivalent. | |
1612 | +# mount -t aufs -o br=/tmp/rw=rw:${HOME}=ro none /tmp/aufs | |
1613 | + Or | |
1614 | +# mount -t aufs -o br:/tmp/rw none /tmp/aufs | |
1615 | +# mount -o remount,append:${HOME} /tmp/aufs | |
1616 | + | |
1617 | +Then, you can see whole tree of your home dir through /tmp/aufs. If | |
1618 | +you modify a file under /tmp/aufs, the one on your home directory is | |
1619 | +not affected, instead the same named file will be newly created under | |
1620 | +/tmp/rw. And all of your modification to a file will be applied to | |
1621 | +the one under /tmp/rw. This is called the file based Copy on Write | |
1622 | +(COW) method. | |
1623 | +Aufs mount options are described in aufs.5. | |
1624 | +If you run chroot or something and make your aufs as a root directory, | |
1625 | +then you need to customize the shutdown script. See the aufs manual in | |
1626 | +detail. | |
1627 | + | |
1628 | +Additionally, there are some sample usages of aufs which are a | |
1629 | +diskless system with network booting, and LiveCD over NFS. | |
1630 | +See sample dir in CVS tree on SourceForge. | |
1631 | + | |
1632 | + | |
1633 | +5. Contact | |
1634 | +---------------------------------------- | |
1635 | +When you have any problems or strange behaviour in aufs, please let me | |
1636 | +know with: | |
1637 | +- /proc/mounts (instead of the output of mount(8)) | |
1638 | +- /sys/module/aufs/* | |
1639 | +- /sys/fs/aufs/* (if you have them) | |
1640 | +- /debug/aufs/* (if you have them) | |
1641 | +- linux kernel version | |
1642 | + if your kernel is not plain, for example modified by distributor, | |
1643 | + the url where i can download its source is necessary too. | |
1644 | +- aufs version which was printed at loading the module or booting the | |
1645 | + system, instead of the date you downloaded. | |
1646 | +- configuration (define/undefine CONFIG_AUFS_xxx) | |
1647 | +- kernel configuration or /proc/config.gz (if you have it) | |
1648 | +- behaviour which you think to be incorrect | |
1649 | +- actual operation, reproducible one is better | |
1650 | +- mailto: aufs-users at lists.sourceforge.net | |
1651 | + | |
1652 | +Usually, I don't watch the Public Areas(Bugs, Support Requests, Patches, | |
1653 | +and Feature Requests) on SourceForge. Please join and write to | |
1654 | +aufs-users ML. | |
1655 | + | |
1656 | + | |
1657 | +6. Acknowledgements | |
1658 | +---------------------------------------- | |
1659 | +Thanks to everyone who have tried and are using aufs, whoever | |
1660 | +have reported a bug or any feedback. | |
1661 | + | |
1662 | +Especially donators: | |
1663 | +Tomas Matejicek(slax.org) made a donation (much more than once). | |
1664 | + Since Apr 2010, Tomas M (the author of Slax and Linux Live | |
1665 | + scripts) is making "doubling" donations. | |
1666 | + Unfortunately I cannot list all of the donators, but I really | |
1667 | + appriciate. | |
1668 | + It ends Aug 2010, but the ordinary donation URL is still available. | |
1669 | + <http://sourceforge.net/donate/index.php?group_id=167503> | |
1670 | +Dai Itasaka made a donation (2007/8). | |
1671 | +Chuck Smith made a donation (2008/4, 10 and 12). | |
1672 | +Henk Schoneveld made a donation (2008/9). | |
1673 | +Chih-Wei Huang, ASUS, CTC donated Eee PC 4G (2008/10). | |
1674 | +Francois Dupoux made a donation (2008/11). | |
1675 | +Bruno Cesar Ribas and Luis Carlos Erpen de Bona, C3SL serves public | |
1676 | + aufs2 GIT tree (2009/2). | |
1677 | +William Grant made a donation (2009/3). | |
1678 | +Patrick Lane made a donation (2009/4). | |
1679 | +The Mail Archive (mail-archive.com) made donations (2009/5). | |
1680 | +Nippy Networks (Ed Wildgoose) made a donation (2009/7). | |
1681 | +New Dream Network, LLC (www.dreamhost.com) made a donation (2009/11). | |
1682 | +Pavel Pronskiy made a donation (2011/2). | |
1683 | +Iridium and Inmarsat satellite phone retailer (www.mailasail.com), Nippy | |
1684 | + Networks (Ed Wildgoose) made a donation for hardware (2011/3). | |
1685 | +Max Lekomcev (DOM-TV project) made a donation (2011/7). | |
1686 | + | |
1687 | +Thank you very much. | |
1688 | +Donations are always, including future donations, very important and | |
1689 | +helpful for me to keep on developing aufs. | |
1690 | + | |
1691 | + | |
1692 | +7. | |
1693 | +---------------------------------------- | |
1694 | +If you are an experienced user, no explanation is needed. Aufs is | |
1695 | +just a linux filesystem. | |
1696 | + | |
1697 | + | |
1698 | +Enjoy! | |
1699 | + | |
1700 | +# Local variables: ; | |
1701 | +# mode: text; | |
1702 | +# End: ; | |
7f207e10 AM |
1703 | diff -urN /usr/share/empty/fs/aufs/aufs.h linux/fs/aufs/aufs.h |
1704 | --- /usr/share/empty/fs/aufs/aufs.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 1705 | +++ linux/fs/aufs/aufs.h 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 1706 | @@ -0,0 +1,60 @@ |
7f207e10 | 1707 | +/* |
027c5e7a | 1708 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
7f207e10 AM |
1709 | + * |
1710 | + * This program, aufs is free software; you can redistribute it and/or modify | |
1711 | + * it under the terms of the GNU General Public License as published by | |
1712 | + * the Free Software Foundation; either version 2 of the License, or | |
1713 | + * (at your option) any later version. | |
1714 | + * | |
1715 | + * This program is distributed in the hope that it will be useful, | |
1716 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1717 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1718 | + * GNU General Public License for more details. | |
1719 | + * | |
1720 | + * You should have received a copy of the GNU General Public License | |
1721 | + * along with this program; if not, write to the Free Software | |
1722 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1723 | + */ | |
1724 | + | |
1725 | +/* | |
1726 | + * all header files | |
1727 | + */ | |
1728 | + | |
1729 | +#ifndef __AUFS_H__ | |
1730 | +#define __AUFS_H__ | |
1731 | + | |
1732 | +#ifdef __KERNEL__ | |
1733 | + | |
1734 | +#define AuStub(type, name, body, ...) \ | |
1735 | + static inline type name(__VA_ARGS__) { body; } | |
1736 | + | |
1737 | +#define AuStubVoid(name, ...) \ | |
1738 | + AuStub(void, name, , __VA_ARGS__) | |
1739 | +#define AuStubInt0(name, ...) \ | |
1740 | + AuStub(int, name, return 0, __VA_ARGS__) | |
1741 | + | |
1742 | +#include "debug.h" | |
1743 | + | |
1744 | +#include "branch.h" | |
1745 | +#include "cpup.h" | |
1746 | +#include "dcsub.h" | |
1747 | +#include "dbgaufs.h" | |
1748 | +#include "dentry.h" | |
1749 | +#include "dir.h" | |
1750 | +#include "dynop.h" | |
1751 | +#include "file.h" | |
1752 | +#include "fstype.h" | |
1753 | +#include "inode.h" | |
1754 | +#include "loop.h" | |
1755 | +#include "module.h" | |
7f207e10 AM |
1756 | +#include "opts.h" |
1757 | +#include "rwsem.h" | |
1758 | +#include "spl.h" | |
1759 | +#include "super.h" | |
1760 | +#include "sysaufs.h" | |
1761 | +#include "vfsub.h" | |
1762 | +#include "whout.h" | |
1763 | +#include "wkq.h" | |
1764 | + | |
1765 | +#endif /* __KERNEL__ */ | |
1766 | +#endif /* __AUFS_H__ */ | |
1767 | diff -urN /usr/share/empty/fs/aufs/branch.c linux/fs/aufs/branch.c | |
1768 | --- /usr/share/empty/fs/aufs/branch.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
1769 | +++ linux/fs/aufs/branch.c 2011-08-24 13:30:24.731313534 +0200 |
1770 | @@ -0,0 +1,1170 @@ | |
7f207e10 | 1771 | +/* |
027c5e7a | 1772 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
7f207e10 AM |
1773 | + * |
1774 | + * This program, aufs is free software; you can redistribute it and/or modify | |
1775 | + * it under the terms of the GNU General Public License as published by | |
1776 | + * the Free Software Foundation; either version 2 of the License, or | |
1777 | + * (at your option) any later version. | |
1778 | + * | |
1779 | + * This program is distributed in the hope that it will be useful, | |
1780 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
1781 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
1782 | + * GNU General Public License for more details. | |
1783 | + * | |
1784 | + * You should have received a copy of the GNU General Public License | |
1785 | + * along with this program; if not, write to the Free Software | |
1786 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1787 | + */ | |
1788 | + | |
1789 | +/* | |
1790 | + * branch management | |
1791 | + */ | |
1792 | + | |
027c5e7a | 1793 | +#include <linux/compat.h> |
7f207e10 AM |
1794 | +#include <linux/file.h> |
1795 | +#include <linux/statfs.h> | |
1796 | +#include "aufs.h" | |
1797 | + | |
1798 | +/* | |
1799 | + * free a single branch | |
1facf9fc | 1800 | + */ |
1801 | +static void au_br_do_free(struct au_branch *br) | |
1802 | +{ | |
1803 | + int i; | |
1804 | + struct au_wbr *wbr; | |
4a4d8108 | 1805 | + struct au_dykey **key; |
1facf9fc | 1806 | + |
027c5e7a AM |
1807 | + au_hnotify_fin_br(br); |
1808 | + | |
1facf9fc | 1809 | + if (br->br_xino.xi_file) |
1810 | + fput(br->br_xino.xi_file); | |
1811 | + mutex_destroy(&br->br_xino.xi_nondir_mtx); | |
1812 | + | |
1813 | + AuDebugOn(atomic_read(&br->br_count)); | |
1814 | + | |
1815 | + wbr = br->br_wbr; | |
1816 | + if (wbr) { | |
1817 | + for (i = 0; i < AuBrWh_Last; i++) | |
1818 | + dput(wbr->wbr_wh[i]); | |
1819 | + AuDebugOn(atomic_read(&wbr->wbr_wh_running)); | |
dece6358 | 1820 | + AuRwDestroy(&wbr->wbr_wh_rwsem); |
1facf9fc | 1821 | + } |
1822 | + | |
4a4d8108 AM |
1823 | + key = br->br_dykey; |
1824 | + for (i = 0; i < AuBrDynOp; i++, key++) | |
1825 | + if (*key) | |
1826 | + au_dy_put(*key); | |
1827 | + else | |
1828 | + break; | |
1829 | + | |
1facf9fc | 1830 | + mntput(br->br_mnt); |
1facf9fc | 1831 | + kfree(wbr); |
1832 | + kfree(br); | |
1833 | +} | |
1834 | + | |
1835 | +/* | |
1836 | + * frees all branches | |
1837 | + */ | |
1838 | +void au_br_free(struct au_sbinfo *sbinfo) | |
1839 | +{ | |
1840 | + aufs_bindex_t bmax; | |
1841 | + struct au_branch **br; | |
1842 | + | |
dece6358 AM |
1843 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
1844 | + | |
1facf9fc | 1845 | + bmax = sbinfo->si_bend + 1; |
1846 | + br = sbinfo->si_branch; | |
1847 | + while (bmax--) | |
1848 | + au_br_do_free(*br++); | |
1849 | +} | |
1850 | + | |
1851 | +/* | |
1852 | + * find the index of a branch which is specified by @br_id. | |
1853 | + */ | |
1854 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id) | |
1855 | +{ | |
1856 | + aufs_bindex_t bindex, bend; | |
1857 | + | |
1858 | + bend = au_sbend(sb); | |
1859 | + for (bindex = 0; bindex <= bend; bindex++) | |
1860 | + if (au_sbr_id(sb, bindex) == br_id) | |
1861 | + return bindex; | |
1862 | + return -1; | |
1863 | +} | |
1864 | + | |
1865 | +/* ---------------------------------------------------------------------- */ | |
1866 | + | |
1867 | +/* | |
1868 | + * add a branch | |
1869 | + */ | |
1870 | + | |
b752ccd1 AM |
1871 | +static int test_overlap(struct super_block *sb, struct dentry *h_adding, |
1872 | + struct dentry *h_root) | |
1facf9fc | 1873 | +{ |
b752ccd1 AM |
1874 | + if (unlikely(h_adding == h_root |
1875 | + || au_test_loopback_overlap(sb, h_adding))) | |
1facf9fc | 1876 | + return 1; |
b752ccd1 AM |
1877 | + if (h_adding->d_sb != h_root->d_sb) |
1878 | + return 0; | |
1879 | + return au_test_subdir(h_adding, h_root) | |
1880 | + || au_test_subdir(h_root, h_adding); | |
1facf9fc | 1881 | +} |
1882 | + | |
1883 | +/* | |
1884 | + * returns a newly allocated branch. @new_nbranch is a number of branches | |
1885 | + * after adding a branch. | |
1886 | + */ | |
1887 | +static struct au_branch *au_br_alloc(struct super_block *sb, int new_nbranch, | |
1888 | + int perm) | |
1889 | +{ | |
1890 | + struct au_branch *add_branch; | |
1891 | + struct dentry *root; | |
4a4d8108 | 1892 | + int err; |
1facf9fc | 1893 | + |
4a4d8108 | 1894 | + err = -ENOMEM; |
1facf9fc | 1895 | + root = sb->s_root; |
1896 | + add_branch = kmalloc(sizeof(*add_branch), GFP_NOFS); | |
1897 | + if (unlikely(!add_branch)) | |
1898 | + goto out; | |
1899 | + | |
027c5e7a AM |
1900 | + err = au_hnotify_init_br(add_branch, perm); |
1901 | + if (unlikely(err)) | |
1902 | + goto out_br; | |
1903 | + | |
1facf9fc | 1904 | + add_branch->br_wbr = NULL; |
1905 | + if (au_br_writable(perm)) { | |
1906 | + /* may be freed separately at changing the branch permission */ | |
1907 | + add_branch->br_wbr = kmalloc(sizeof(*add_branch->br_wbr), | |
1908 | + GFP_NOFS); | |
1909 | + if (unlikely(!add_branch->br_wbr)) | |
027c5e7a | 1910 | + goto out_hnotify; |
1facf9fc | 1911 | + } |
1912 | + | |
4a4d8108 AM |
1913 | + err = au_sbr_realloc(au_sbi(sb), new_nbranch); |
1914 | + if (!err) | |
1915 | + err = au_di_realloc(au_di(root), new_nbranch); | |
1916 | + if (!err) | |
1917 | + err = au_ii_realloc(au_ii(root->d_inode), new_nbranch); | |
1918 | + if (!err) | |
1919 | + return add_branch; /* success */ | |
1facf9fc | 1920 | + |
1facf9fc | 1921 | + kfree(add_branch->br_wbr); |
4a4d8108 | 1922 | + |
027c5e7a AM |
1923 | +out_hnotify: |
1924 | + au_hnotify_fin_br(add_branch); | |
4f0767ce | 1925 | +out_br: |
1facf9fc | 1926 | + kfree(add_branch); |
4f0767ce | 1927 | +out: |
4a4d8108 | 1928 | + return ERR_PTR(err); |
1facf9fc | 1929 | +} |
1930 | + | |
1931 | +/* | |
1932 | + * test if the branch permission is legal or not. | |
1933 | + */ | |
1934 | +static int test_br(struct inode *inode, int brperm, char *path) | |
1935 | +{ | |
1936 | + int err; | |
1937 | + | |
4a4d8108 AM |
1938 | + err = (au_br_writable(brperm) && IS_RDONLY(inode)); |
1939 | + if (!err) | |
1940 | + goto out; | |
1facf9fc | 1941 | + |
4a4d8108 AM |
1942 | + err = -EINVAL; |
1943 | + pr_err("write permission for readonly mount or inode, %s\n", path); | |
1944 | + | |
4f0767ce | 1945 | +out: |
1facf9fc | 1946 | + return err; |
1947 | +} | |
1948 | + | |
1949 | +/* | |
1950 | + * returns: | |
1951 | + * 0: success, the caller will add it | |
1952 | + * plus: success, it is already unified, the caller should ignore it | |
1953 | + * minus: error | |
1954 | + */ | |
1955 | +static int test_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
1956 | +{ | |
1957 | + int err; | |
1958 | + aufs_bindex_t bend, bindex; | |
1959 | + struct dentry *root; | |
1960 | + struct inode *inode, *h_inode; | |
1961 | + | |
1962 | + root = sb->s_root; | |
1963 | + bend = au_sbend(sb); | |
1964 | + if (unlikely(bend >= 0 | |
1965 | + && au_find_dbindex(root, add->path.dentry) >= 0)) { | |
1966 | + err = 1; | |
1967 | + if (!remount) { | |
1968 | + err = -EINVAL; | |
4a4d8108 | 1969 | + pr_err("%s duplicated\n", add->pathname); |
1facf9fc | 1970 | + } |
1971 | + goto out; | |
1972 | + } | |
1973 | + | |
1974 | + err = -ENOSPC; /* -E2BIG; */ | |
1975 | + if (unlikely(AUFS_BRANCH_MAX <= add->bindex | |
1976 | + || AUFS_BRANCH_MAX - 1 <= bend)) { | |
4a4d8108 | 1977 | + pr_err("number of branches exceeded %s\n", add->pathname); |
1facf9fc | 1978 | + goto out; |
1979 | + } | |
1980 | + | |
1981 | + err = -EDOM; | |
1982 | + if (unlikely(add->bindex < 0 || bend + 1 < add->bindex)) { | |
4a4d8108 | 1983 | + pr_err("bad index %d\n", add->bindex); |
1facf9fc | 1984 | + goto out; |
1985 | + } | |
1986 | + | |
1987 | + inode = add->path.dentry->d_inode; | |
1988 | + err = -ENOENT; | |
1989 | + if (unlikely(!inode->i_nlink)) { | |
4a4d8108 | 1990 | + pr_err("no existence %s\n", add->pathname); |
1facf9fc | 1991 | + goto out; |
1992 | + } | |
1993 | + | |
1994 | + err = -EINVAL; | |
1995 | + if (unlikely(inode->i_sb == sb)) { | |
4a4d8108 | 1996 | + pr_err("%s must be outside\n", add->pathname); |
1facf9fc | 1997 | + goto out; |
1998 | + } | |
1999 | + | |
2000 | + if (unlikely(au_test_fs_unsuppoted(inode->i_sb))) { | |
4a4d8108 AM |
2001 | + pr_err("unsupported filesystem, %s (%s)\n", |
2002 | + add->pathname, au_sbtype(inode->i_sb)); | |
1facf9fc | 2003 | + goto out; |
2004 | + } | |
2005 | + | |
2006 | + err = test_br(add->path.dentry->d_inode, add->perm, add->pathname); | |
2007 | + if (unlikely(err)) | |
2008 | + goto out; | |
2009 | + | |
2010 | + if (bend < 0) | |
2011 | + return 0; /* success */ | |
2012 | + | |
2013 | + err = -EINVAL; | |
2014 | + for (bindex = 0; bindex <= bend; bindex++) | |
2015 | + if (unlikely(test_overlap(sb, add->path.dentry, | |
2016 | + au_h_dptr(root, bindex)))) { | |
4a4d8108 | 2017 | + pr_err("%s is overlapped\n", add->pathname); |
1facf9fc | 2018 | + goto out; |
2019 | + } | |
2020 | + | |
2021 | + err = 0; | |
2022 | + if (au_opt_test(au_mntflags(sb), WARN_PERM)) { | |
2023 | + h_inode = au_h_dptr(root, 0)->d_inode; | |
2024 | + if ((h_inode->i_mode & S_IALLUGO) != (inode->i_mode & S_IALLUGO) | |
2025 | + || h_inode->i_uid != inode->i_uid | |
2026 | + || h_inode->i_gid != inode->i_gid) | |
4a4d8108 AM |
2027 | + pr_warning("uid/gid/perm %s %u/%u/0%o, %u/%u/0%o\n", |
2028 | + add->pathname, | |
2029 | + inode->i_uid, inode->i_gid, | |
2030 | + (inode->i_mode & S_IALLUGO), | |
2031 | + h_inode->i_uid, h_inode->i_gid, | |
2032 | + (h_inode->i_mode & S_IALLUGO)); | |
1facf9fc | 2033 | + } |
2034 | + | |
4f0767ce | 2035 | +out: |
1facf9fc | 2036 | + return err; |
2037 | +} | |
2038 | + | |
2039 | +/* | |
2040 | + * initialize or clean the whiteouts for an adding branch | |
2041 | + */ | |
2042 | +static int au_br_init_wh(struct super_block *sb, struct au_branch *br, | |
2043 | + int new_perm, struct dentry *h_root) | |
2044 | +{ | |
2045 | + int err, old_perm; | |
2046 | + aufs_bindex_t bindex; | |
2047 | + struct mutex *h_mtx; | |
2048 | + struct au_wbr *wbr; | |
2049 | + struct au_hinode *hdir; | |
2050 | + | |
2051 | + wbr = br->br_wbr; | |
2052 | + old_perm = br->br_perm; | |
2053 | + br->br_perm = new_perm; | |
2054 | + hdir = NULL; | |
2055 | + h_mtx = NULL; | |
2056 | + bindex = au_br_index(sb, br->br_id); | |
2057 | + if (0 <= bindex) { | |
2058 | + hdir = au_hi(sb->s_root->d_inode, bindex); | |
4a4d8108 | 2059 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 2060 | + } else { |
2061 | + h_mtx = &h_root->d_inode->i_mutex; | |
2062 | + mutex_lock_nested(h_mtx, AuLsc_I_PARENT); | |
2063 | + } | |
2064 | + if (!wbr) | |
2065 | + err = au_wh_init(h_root, br, sb); | |
2066 | + else { | |
2067 | + wbr_wh_write_lock(wbr); | |
2068 | + err = au_wh_init(h_root, br, sb); | |
2069 | + wbr_wh_write_unlock(wbr); | |
2070 | + } | |
2071 | + if (hdir) | |
4a4d8108 | 2072 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 2073 | + else |
2074 | + mutex_unlock(h_mtx); | |
2075 | + br->br_perm = old_perm; | |
2076 | + | |
2077 | + if (!err && wbr && !au_br_writable(new_perm)) { | |
2078 | + kfree(wbr); | |
2079 | + br->br_wbr = NULL; | |
2080 | + } | |
2081 | + | |
2082 | + return err; | |
2083 | +} | |
2084 | + | |
2085 | +static int au_wbr_init(struct au_branch *br, struct super_block *sb, | |
2086 | + int perm, struct path *path) | |
2087 | +{ | |
2088 | + int err; | |
4a4d8108 | 2089 | + struct kstatfs kst; |
1facf9fc | 2090 | + struct au_wbr *wbr; |
4a4d8108 | 2091 | + struct dentry *h_dentry; |
1facf9fc | 2092 | + |
2093 | + wbr = br->br_wbr; | |
dece6358 | 2094 | + au_rw_init(&wbr->wbr_wh_rwsem); |
1facf9fc | 2095 | + memset(wbr->wbr_wh, 0, sizeof(wbr->wbr_wh)); |
2096 | + atomic_set(&wbr->wbr_wh_running, 0); | |
2097 | + wbr->wbr_bytes = 0; | |
2098 | + | |
4a4d8108 AM |
2099 | + /* |
2100 | + * a limit for rmdir/rename a dir | |
2101 | + * cf. AUFS_MAX_NAMELEN in include/linux/aufs_type.h | |
2102 | + */ | |
7f207e10 | 2103 | + err = vfs_statfs(path, &kst); |
4a4d8108 AM |
2104 | + if (unlikely(err)) |
2105 | + goto out; | |
2106 | + err = -EINVAL; | |
7f207e10 | 2107 | + h_dentry = path->dentry; |
4a4d8108 AM |
2108 | + if (kst.f_namelen >= NAME_MAX) |
2109 | + err = au_br_init_wh(sb, br, perm, h_dentry); | |
2110 | + else | |
2111 | + pr_err("%.*s(%s), unsupported namelen %ld\n", | |
2112 | + AuDLNPair(h_dentry), au_sbtype(h_dentry->d_sb), | |
2113 | + kst.f_namelen); | |
1facf9fc | 2114 | + |
4f0767ce | 2115 | +out: |
1facf9fc | 2116 | + return err; |
2117 | +} | |
2118 | + | |
2119 | +/* intialize a new branch */ | |
2120 | +static int au_br_init(struct au_branch *br, struct super_block *sb, | |
2121 | + struct au_opt_add *add) | |
2122 | +{ | |
2123 | + int err; | |
2124 | + | |
2125 | + err = 0; | |
2126 | + memset(&br->br_xino, 0, sizeof(br->br_xino)); | |
2127 | + mutex_init(&br->br_xino.xi_nondir_mtx); | |
2128 | + br->br_perm = add->perm; | |
2129 | + br->br_mnt = add->path.mnt; /* set first, mntget() later */ | |
4a4d8108 AM |
2130 | + spin_lock_init(&br->br_dykey_lock); |
2131 | + memset(br->br_dykey, 0, sizeof(br->br_dykey)); | |
1facf9fc | 2132 | + atomic_set(&br->br_count, 0); |
2133 | + br->br_xino_upper = AUFS_XINO_TRUNC_INIT; | |
2134 | + atomic_set(&br->br_xino_running, 0); | |
2135 | + br->br_id = au_new_br_id(sb); | |
7f207e10 | 2136 | + AuDebugOn(br->br_id < 0); |
1facf9fc | 2137 | + |
2138 | + if (au_br_writable(add->perm)) { | |
2139 | + err = au_wbr_init(br, sb, add->perm, &add->path); | |
2140 | + if (unlikely(err)) | |
b752ccd1 | 2141 | + goto out_err; |
1facf9fc | 2142 | + } |
2143 | + | |
2144 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
2145 | + err = au_xino_br(sb, br, add->path.dentry->d_inode->i_ino, | |
2146 | + au_sbr(sb, 0)->br_xino.xi_file, /*do_test*/1); | |
2147 | + if (unlikely(err)) { | |
2148 | + AuDebugOn(br->br_xino.xi_file); | |
b752ccd1 | 2149 | + goto out_err; |
1facf9fc | 2150 | + } |
2151 | + } | |
2152 | + | |
2153 | + sysaufs_br_init(br); | |
2154 | + mntget(add->path.mnt); | |
b752ccd1 | 2155 | + goto out; /* success */ |
1facf9fc | 2156 | + |
4f0767ce | 2157 | +out_err: |
b752ccd1 | 2158 | + br->br_mnt = NULL; |
4f0767ce | 2159 | +out: |
1facf9fc | 2160 | + return err; |
2161 | +} | |
2162 | + | |
2163 | +static void au_br_do_add_brp(struct au_sbinfo *sbinfo, aufs_bindex_t bindex, | |
2164 | + struct au_branch *br, aufs_bindex_t bend, | |
2165 | + aufs_bindex_t amount) | |
2166 | +{ | |
2167 | + struct au_branch **brp; | |
2168 | + | |
dece6358 AM |
2169 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
2170 | + | |
1facf9fc | 2171 | + brp = sbinfo->si_branch + bindex; |
2172 | + memmove(brp + 1, brp, sizeof(*brp) * amount); | |
2173 | + *brp = br; | |
2174 | + sbinfo->si_bend++; | |
2175 | + if (unlikely(bend < 0)) | |
2176 | + sbinfo->si_bend = 0; | |
2177 | +} | |
2178 | + | |
2179 | +static void au_br_do_add_hdp(struct au_dinfo *dinfo, aufs_bindex_t bindex, | |
2180 | + aufs_bindex_t bend, aufs_bindex_t amount) | |
2181 | +{ | |
2182 | + struct au_hdentry *hdp; | |
2183 | + | |
1308ab2a | 2184 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
2185 | + | |
1facf9fc | 2186 | + hdp = dinfo->di_hdentry + bindex; |
2187 | + memmove(hdp + 1, hdp, sizeof(*hdp) * amount); | |
2188 | + au_h_dentry_init(hdp); | |
2189 | + dinfo->di_bend++; | |
2190 | + if (unlikely(bend < 0)) | |
2191 | + dinfo->di_bstart = 0; | |
2192 | +} | |
2193 | + | |
2194 | +static void au_br_do_add_hip(struct au_iinfo *iinfo, aufs_bindex_t bindex, | |
2195 | + aufs_bindex_t bend, aufs_bindex_t amount) | |
2196 | +{ | |
2197 | + struct au_hinode *hip; | |
2198 | + | |
1308ab2a | 2199 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
2200 | + | |
1facf9fc | 2201 | + hip = iinfo->ii_hinode + bindex; |
2202 | + memmove(hip + 1, hip, sizeof(*hip) * amount); | |
2203 | + hip->hi_inode = NULL; | |
4a4d8108 | 2204 | + au_hn_init(hip); |
1facf9fc | 2205 | + iinfo->ii_bend++; |
2206 | + if (unlikely(bend < 0)) | |
2207 | + iinfo->ii_bstart = 0; | |
2208 | +} | |
2209 | + | |
2210 | +static void au_br_do_add(struct super_block *sb, struct dentry *h_dentry, | |
2211 | + struct au_branch *br, aufs_bindex_t bindex) | |
2212 | +{ | |
2213 | + struct dentry *root; | |
2214 | + struct inode *root_inode; | |
2215 | + aufs_bindex_t bend, amount; | |
2216 | + | |
2217 | + root = sb->s_root; | |
2218 | + root_inode = root->d_inode; | |
1facf9fc | 2219 | + bend = au_sbend(sb); |
2220 | + amount = bend + 1 - bindex; | |
53392da6 | 2221 | + au_sbilist_lock(); |
1facf9fc | 2222 | + au_br_do_add_brp(au_sbi(sb), bindex, br, bend, amount); |
2223 | + au_br_do_add_hdp(au_di(root), bindex, bend, amount); | |
2224 | + au_br_do_add_hip(au_ii(root_inode), bindex, bend, amount); | |
2225 | + au_set_h_dptr(root, bindex, dget(h_dentry)); | |
2226 | + au_set_h_iptr(root_inode, bindex, au_igrab(h_dentry->d_inode), | |
2227 | + /*flags*/0); | |
53392da6 | 2228 | + au_sbilist_unlock(); |
1facf9fc | 2229 | +} |
2230 | + | |
2231 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount) | |
2232 | +{ | |
2233 | + int err; | |
1facf9fc | 2234 | + aufs_bindex_t bend, add_bindex; |
2235 | + struct dentry *root, *h_dentry; | |
2236 | + struct inode *root_inode; | |
2237 | + struct au_branch *add_branch; | |
2238 | + | |
2239 | + root = sb->s_root; | |
2240 | + root_inode = root->d_inode; | |
2241 | + IMustLock(root_inode); | |
2242 | + err = test_add(sb, add, remount); | |
2243 | + if (unlikely(err < 0)) | |
2244 | + goto out; | |
2245 | + if (err) { | |
2246 | + err = 0; | |
2247 | + goto out; /* success */ | |
2248 | + } | |
2249 | + | |
2250 | + bend = au_sbend(sb); | |
2251 | + add_branch = au_br_alloc(sb, bend + 2, add->perm); | |
2252 | + err = PTR_ERR(add_branch); | |
2253 | + if (IS_ERR(add_branch)) | |
2254 | + goto out; | |
2255 | + | |
2256 | + err = au_br_init(add_branch, sb, add); | |
2257 | + if (unlikely(err)) { | |
2258 | + au_br_do_free(add_branch); | |
2259 | + goto out; | |
2260 | + } | |
2261 | + | |
2262 | + add_bindex = add->bindex; | |
2263 | + h_dentry = add->path.dentry; | |
2264 | + if (!remount) | |
2265 | + au_br_do_add(sb, h_dentry, add_branch, add_bindex); | |
2266 | + else { | |
2267 | + sysaufs_brs_del(sb, add_bindex); | |
2268 | + au_br_do_add(sb, h_dentry, add_branch, add_bindex); | |
2269 | + sysaufs_brs_add(sb, add_bindex); | |
2270 | + } | |
2271 | + | |
1308ab2a | 2272 | + if (!add_bindex) { |
1facf9fc | 2273 | + au_cpup_attr_all(root_inode, /*force*/1); |
1308ab2a | 2274 | + sb->s_maxbytes = h_dentry->d_sb->s_maxbytes; |
2275 | + } else | |
1facf9fc | 2276 | + au_add_nlink(root_inode, h_dentry->d_inode); |
1facf9fc | 2277 | + |
2278 | + /* | |
4a4d8108 | 2279 | + * this test/set prevents aufs from handling unnecesary notify events |
027c5e7a | 2280 | + * of xino files, in case of re-adding a writable branch which was |
1facf9fc | 2281 | + * once detached from aufs. |
2282 | + */ | |
2283 | + if (au_xino_brid(sb) < 0 | |
2284 | + && au_br_writable(add_branch->br_perm) | |
2285 | + && !au_test_fs_bad_xino(h_dentry->d_sb) | |
2286 | + && add_branch->br_xino.xi_file | |
2287 | + && add_branch->br_xino.xi_file->f_dentry->d_parent == h_dentry) | |
2288 | + au_xino_brid_set(sb, add_branch->br_id); | |
2289 | + | |
4f0767ce | 2290 | +out: |
1facf9fc | 2291 | + return err; |
2292 | +} | |
2293 | + | |
2294 | +/* ---------------------------------------------------------------------- */ | |
2295 | + | |
2296 | +/* | |
2297 | + * delete a branch | |
2298 | + */ | |
2299 | + | |
2300 | +/* to show the line number, do not make it inlined function */ | |
4a4d8108 | 2301 | +#define AuVerbose(do_info, fmt, ...) do { \ |
1facf9fc | 2302 | + if (do_info) \ |
4a4d8108 | 2303 | + pr_info(fmt, ##__VA_ARGS__); \ |
1facf9fc | 2304 | +} while (0) |
2305 | + | |
027c5e7a AM |
2306 | +static int au_test_ibusy(struct inode *inode, aufs_bindex_t bstart, |
2307 | + aufs_bindex_t bend) | |
2308 | +{ | |
2309 | + return (inode && !S_ISDIR(inode->i_mode)) || bstart == bend; | |
2310 | +} | |
2311 | + | |
2312 | +static int au_test_dbusy(struct dentry *dentry, aufs_bindex_t bstart, | |
2313 | + aufs_bindex_t bend) | |
2314 | +{ | |
2315 | + return au_test_ibusy(dentry->d_inode, bstart, bend); | |
2316 | +} | |
2317 | + | |
1facf9fc | 2318 | +/* |
2319 | + * test if the branch is deletable or not. | |
2320 | + */ | |
2321 | +static int test_dentry_busy(struct dentry *root, aufs_bindex_t bindex, | |
b752ccd1 | 2322 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 2323 | +{ |
2324 | + int err, i, j, ndentry; | |
2325 | + aufs_bindex_t bstart, bend; | |
1facf9fc | 2326 | + struct au_dcsub_pages dpages; |
2327 | + struct au_dpage *dpage; | |
2328 | + struct dentry *d; | |
1facf9fc | 2329 | + |
2330 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
2331 | + if (unlikely(err)) | |
2332 | + goto out; | |
2333 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); | |
2334 | + if (unlikely(err)) | |
2335 | + goto out_dpages; | |
2336 | + | |
1facf9fc | 2337 | + for (i = 0; !err && i < dpages.ndpage; i++) { |
2338 | + dpage = dpages.dpages + i; | |
2339 | + ndentry = dpage->ndentry; | |
2340 | + for (j = 0; !err && j < ndentry; j++) { | |
2341 | + d = dpage->dentries[j]; | |
027c5e7a AM |
2342 | + AuDebugOn(!d->d_count); |
2343 | + if (!au_digen_test(d, sigen)) { | |
1facf9fc | 2344 | + di_read_lock_child(d, AuLock_IR); |
027c5e7a AM |
2345 | + if (unlikely(au_dbrange_test(d))) { |
2346 | + di_read_unlock(d, AuLock_IR); | |
2347 | + continue; | |
2348 | + } | |
2349 | + } else { | |
1facf9fc | 2350 | + di_write_lock_child(d); |
027c5e7a AM |
2351 | + if (unlikely(au_dbrange_test(d))) { |
2352 | + di_write_unlock(d); | |
2353 | + continue; | |
2354 | + } | |
1facf9fc | 2355 | + err = au_reval_dpath(d, sigen); |
2356 | + if (!err) | |
2357 | + di_downgrade_lock(d, AuLock_IR); | |
2358 | + else { | |
2359 | + di_write_unlock(d); | |
2360 | + break; | |
2361 | + } | |
2362 | + } | |
2363 | + | |
027c5e7a | 2364 | + /* AuDbgDentry(d); */ |
1facf9fc | 2365 | + bstart = au_dbstart(d); |
2366 | + bend = au_dbend(d); | |
2367 | + if (bstart <= bindex | |
2368 | + && bindex <= bend | |
2369 | + && au_h_dptr(d, bindex) | |
027c5e7a | 2370 | + && au_test_dbusy(d, bstart, bend)) { |
1facf9fc | 2371 | + err = -EBUSY; |
2372 | + AuVerbose(verbose, "busy %.*s\n", AuDLNPair(d)); | |
027c5e7a | 2373 | + AuDbgDentry(d); |
1facf9fc | 2374 | + } |
2375 | + di_read_unlock(d, AuLock_IR); | |
2376 | + } | |
2377 | + } | |
2378 | + | |
4f0767ce | 2379 | +out_dpages: |
1facf9fc | 2380 | + au_dpages_free(&dpages); |
4f0767ce | 2381 | +out: |
1facf9fc | 2382 | + return err; |
2383 | +} | |
2384 | + | |
2385 | +static int test_inode_busy(struct super_block *sb, aufs_bindex_t bindex, | |
b752ccd1 | 2386 | + unsigned int sigen, const unsigned int verbose) |
1facf9fc | 2387 | +{ |
2388 | + int err; | |
7f207e10 AM |
2389 | + unsigned long long max, ull; |
2390 | + struct inode *i, **array; | |
1facf9fc | 2391 | + aufs_bindex_t bstart, bend; |
1facf9fc | 2392 | + |
7f207e10 AM |
2393 | + array = au_iarray_alloc(sb, &max); |
2394 | + err = PTR_ERR(array); | |
2395 | + if (IS_ERR(array)) | |
2396 | + goto out; | |
2397 | + | |
1facf9fc | 2398 | + err = 0; |
7f207e10 AM |
2399 | + AuDbg("b%d\n", bindex); |
2400 | + for (ull = 0; !err && ull < max; ull++) { | |
2401 | + i = array[ull]; | |
2402 | + if (i->i_ino == AUFS_ROOT_INO) | |
1facf9fc | 2403 | + continue; |
2404 | + | |
7f207e10 | 2405 | + /* AuDbgInode(i); */ |
1facf9fc | 2406 | + if (au_iigen(i) == sigen) |
2407 | + ii_read_lock_child(i); | |
2408 | + else { | |
2409 | + ii_write_lock_child(i); | |
027c5e7a AM |
2410 | + err = au_refresh_hinode_self(i); |
2411 | + au_iigen_dec(i); | |
1facf9fc | 2412 | + if (!err) |
2413 | + ii_downgrade_lock(i); | |
2414 | + else { | |
2415 | + ii_write_unlock(i); | |
2416 | + break; | |
2417 | + } | |
2418 | + } | |
2419 | + | |
2420 | + bstart = au_ibstart(i); | |
2421 | + bend = au_ibend(i); | |
2422 | + if (bstart <= bindex | |
2423 | + && bindex <= bend | |
2424 | + && au_h_iptr(i, bindex) | |
027c5e7a | 2425 | + && au_test_ibusy(i, bstart, bend)) { |
1facf9fc | 2426 | + err = -EBUSY; |
2427 | + AuVerbose(verbose, "busy i%lu\n", i->i_ino); | |
7f207e10 | 2428 | + AuDbgInode(i); |
1facf9fc | 2429 | + } |
2430 | + ii_read_unlock(i); | |
2431 | + } | |
7f207e10 | 2432 | + au_iarray_free(array, max); |
1facf9fc | 2433 | + |
7f207e10 | 2434 | +out: |
1facf9fc | 2435 | + return err; |
2436 | +} | |
2437 | + | |
b752ccd1 AM |
2438 | +static int test_children_busy(struct dentry *root, aufs_bindex_t bindex, |
2439 | + const unsigned int verbose) | |
1facf9fc | 2440 | +{ |
2441 | + int err; | |
2442 | + unsigned int sigen; | |
2443 | + | |
2444 | + sigen = au_sigen(root->d_sb); | |
2445 | + DiMustNoWaiters(root); | |
2446 | + IiMustNoWaiters(root->d_inode); | |
2447 | + di_write_unlock(root); | |
b752ccd1 | 2448 | + err = test_dentry_busy(root, bindex, sigen, verbose); |
1facf9fc | 2449 | + if (!err) |
b752ccd1 | 2450 | + err = test_inode_busy(root->d_sb, bindex, sigen, verbose); |
1facf9fc | 2451 | + di_write_lock_child(root); /* aufs_write_lock() calls ..._child() */ |
2452 | + | |
2453 | + return err; | |
2454 | +} | |
2455 | + | |
2456 | +static void au_br_do_del_brp(struct au_sbinfo *sbinfo, | |
2457 | + const aufs_bindex_t bindex, | |
2458 | + const aufs_bindex_t bend) | |
2459 | +{ | |
2460 | + struct au_branch **brp, **p; | |
2461 | + | |
dece6358 AM |
2462 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
2463 | + | |
1facf9fc | 2464 | + brp = sbinfo->si_branch + bindex; |
2465 | + if (bindex < bend) | |
2466 | + memmove(brp, brp + 1, sizeof(*brp) * (bend - bindex)); | |
2467 | + sbinfo->si_branch[0 + bend] = NULL; | |
2468 | + sbinfo->si_bend--; | |
2469 | + | |
53392da6 | 2470 | + p = krealloc(sbinfo->si_branch, sizeof(*p) * bend, AuGFP_SBILIST); |
1facf9fc | 2471 | + if (p) |
2472 | + sbinfo->si_branch = p; | |
4a4d8108 | 2473 | + /* harmless error */ |
1facf9fc | 2474 | +} |
2475 | + | |
2476 | +static void au_br_do_del_hdp(struct au_dinfo *dinfo, const aufs_bindex_t bindex, | |
2477 | + const aufs_bindex_t bend) | |
2478 | +{ | |
2479 | + struct au_hdentry *hdp, *p; | |
2480 | + | |
1308ab2a | 2481 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
2482 | + | |
4a4d8108 | 2483 | + hdp = dinfo->di_hdentry; |
1facf9fc | 2484 | + if (bindex < bend) |
4a4d8108 AM |
2485 | + memmove(hdp + bindex, hdp + bindex + 1, |
2486 | + sizeof(*hdp) * (bend - bindex)); | |
2487 | + hdp[0 + bend].hd_dentry = NULL; | |
1facf9fc | 2488 | + dinfo->di_bend--; |
2489 | + | |
53392da6 | 2490 | + p = krealloc(hdp, sizeof(*p) * bend, AuGFP_SBILIST); |
1facf9fc | 2491 | + if (p) |
2492 | + dinfo->di_hdentry = p; | |
4a4d8108 | 2493 | + /* harmless error */ |
1facf9fc | 2494 | +} |
2495 | + | |
2496 | +static void au_br_do_del_hip(struct au_iinfo *iinfo, const aufs_bindex_t bindex, | |
2497 | + const aufs_bindex_t bend) | |
2498 | +{ | |
2499 | + struct au_hinode *hip, *p; | |
2500 | + | |
1308ab2a | 2501 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
2502 | + | |
1facf9fc | 2503 | + hip = iinfo->ii_hinode + bindex; |
2504 | + if (bindex < bend) | |
2505 | + memmove(hip, hip + 1, sizeof(*hip) * (bend - bindex)); | |
2506 | + iinfo->ii_hinode[0 + bend].hi_inode = NULL; | |
4a4d8108 | 2507 | + au_hn_init(iinfo->ii_hinode + bend); |
1facf9fc | 2508 | + iinfo->ii_bend--; |
2509 | + | |
53392da6 | 2510 | + p = krealloc(iinfo->ii_hinode, sizeof(*p) * bend, AuGFP_SBILIST); |
1facf9fc | 2511 | + if (p) |
2512 | + iinfo->ii_hinode = p; | |
4a4d8108 | 2513 | + /* harmless error */ |
1facf9fc | 2514 | +} |
2515 | + | |
2516 | +static void au_br_do_del(struct super_block *sb, aufs_bindex_t bindex, | |
2517 | + struct au_branch *br) | |
2518 | +{ | |
2519 | + aufs_bindex_t bend; | |
2520 | + struct au_sbinfo *sbinfo; | |
53392da6 AM |
2521 | + struct dentry *root, *h_root; |
2522 | + struct inode *inode, *h_inode; | |
2523 | + struct au_hinode *hinode; | |
1facf9fc | 2524 | + |
dece6358 AM |
2525 | + SiMustWriteLock(sb); |
2526 | + | |
1facf9fc | 2527 | + root = sb->s_root; |
2528 | + inode = root->d_inode; | |
1facf9fc | 2529 | + sbinfo = au_sbi(sb); |
2530 | + bend = sbinfo->si_bend; | |
2531 | + | |
53392da6 AM |
2532 | + h_root = au_h_dptr(root, bindex); |
2533 | + hinode = au_hi(inode, bindex); | |
2534 | + h_inode = au_igrab(hinode->hi_inode); | |
2535 | + au_hiput(hinode); | |
1facf9fc | 2536 | + |
53392da6 | 2537 | + au_sbilist_lock(); |
1facf9fc | 2538 | + au_br_do_del_brp(sbinfo, bindex, bend); |
2539 | + au_br_do_del_hdp(au_di(root), bindex, bend); | |
2540 | + au_br_do_del_hip(au_ii(inode), bindex, bend); | |
53392da6 AM |
2541 | + au_sbilist_unlock(); |
2542 | + | |
2543 | + dput(h_root); | |
2544 | + iput(h_inode); | |
2545 | + au_br_do_free(br); | |
1facf9fc | 2546 | +} |
2547 | + | |
2548 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount) | |
2549 | +{ | |
2550 | + int err, rerr, i; | |
2551 | + unsigned int mnt_flags; | |
2552 | + aufs_bindex_t bindex, bend, br_id; | |
2553 | + unsigned char do_wh, verbose; | |
2554 | + struct au_branch *br; | |
2555 | + struct au_wbr *wbr; | |
2556 | + | |
2557 | + err = 0; | |
2558 | + bindex = au_find_dbindex(sb->s_root, del->h_path.dentry); | |
2559 | + if (bindex < 0) { | |
2560 | + if (remount) | |
2561 | + goto out; /* success */ | |
2562 | + err = -ENOENT; | |
4a4d8108 | 2563 | + pr_err("%s no such branch\n", del->pathname); |
1facf9fc | 2564 | + goto out; |
2565 | + } | |
2566 | + AuDbg("bindex b%d\n", bindex); | |
2567 | + | |
2568 | + err = -EBUSY; | |
2569 | + mnt_flags = au_mntflags(sb); | |
2570 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
2571 | + bend = au_sbend(sb); | |
2572 | + if (unlikely(!bend)) { | |
2573 | + AuVerbose(verbose, "no more branches left\n"); | |
2574 | + goto out; | |
2575 | + } | |
2576 | + br = au_sbr(sb, bindex); | |
2577 | + i = atomic_read(&br->br_count); | |
2578 | + if (unlikely(i)) { | |
2579 | + AuVerbose(verbose, "%d file(s) opened\n", i); | |
e49829fe | 2580 | + goto out; |
1facf9fc | 2581 | + } |
2582 | + | |
2583 | + wbr = br->br_wbr; | |
2584 | + do_wh = wbr && (wbr->wbr_whbase || wbr->wbr_plink || wbr->wbr_orph); | |
2585 | + if (do_wh) { | |
1308ab2a | 2586 | + /* instead of WbrWhMustWriteLock(wbr) */ |
2587 | + SiMustWriteLock(sb); | |
1facf9fc | 2588 | + for (i = 0; i < AuBrWh_Last; i++) { |
2589 | + dput(wbr->wbr_wh[i]); | |
2590 | + wbr->wbr_wh[i] = NULL; | |
2591 | + } | |
2592 | + } | |
2593 | + | |
b752ccd1 | 2594 | + err = test_children_busy(sb->s_root, bindex, verbose); |
1facf9fc | 2595 | + if (unlikely(err)) { |
2596 | + if (do_wh) | |
2597 | + goto out_wh; | |
2598 | + goto out; | |
2599 | + } | |
2600 | + | |
2601 | + err = 0; | |
2602 | + br_id = br->br_id; | |
2603 | + if (!remount) | |
2604 | + au_br_do_del(sb, bindex, br); | |
2605 | + else { | |
2606 | + sysaufs_brs_del(sb, bindex); | |
2607 | + au_br_do_del(sb, bindex, br); | |
2608 | + sysaufs_brs_add(sb, bindex); | |
2609 | + } | |
2610 | + | |
1308ab2a | 2611 | + if (!bindex) { |
1facf9fc | 2612 | + au_cpup_attr_all(sb->s_root->d_inode, /*force*/1); |
1308ab2a | 2613 | + sb->s_maxbytes = au_sbr_sb(sb, 0)->s_maxbytes; |
2614 | + } else | |
1facf9fc | 2615 | + au_sub_nlink(sb->s_root->d_inode, del->h_path.dentry->d_inode); |
2616 | + if (au_opt_test(mnt_flags, PLINK)) | |
2617 | + au_plink_half_refresh(sb, br_id); | |
2618 | + | |
b752ccd1 | 2619 | + if (au_xino_brid(sb) == br_id) |
1facf9fc | 2620 | + au_xino_brid_set(sb, -1); |
2621 | + goto out; /* success */ | |
2622 | + | |
4f0767ce | 2623 | +out_wh: |
1facf9fc | 2624 | + /* revert */ |
2625 | + rerr = au_br_init_wh(sb, br, br->br_perm, del->h_path.dentry); | |
2626 | + if (rerr) | |
4a4d8108 AM |
2627 | + pr_warning("failed re-creating base whiteout, %s. (%d)\n", |
2628 | + del->pathname, rerr); | |
4f0767ce | 2629 | +out: |
1facf9fc | 2630 | + return err; |
2631 | +} | |
2632 | + | |
2633 | +/* ---------------------------------------------------------------------- */ | |
2634 | + | |
027c5e7a AM |
2635 | +static int au_ibusy(struct super_block *sb, struct aufs_ibusy __user *arg) |
2636 | +{ | |
2637 | + int err; | |
2638 | + aufs_bindex_t bstart, bend; | |
2639 | + struct aufs_ibusy ibusy; | |
2640 | + struct inode *inode, *h_inode; | |
2641 | + | |
2642 | + err = -EPERM; | |
2643 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
2644 | + goto out; | |
2645 | + | |
2646 | + err = copy_from_user(&ibusy, arg, sizeof(ibusy)); | |
2647 | + if (!err) | |
2648 | + err = !access_ok(VERIFY_WRITE, &arg->h_ino, sizeof(arg->h_ino)); | |
2649 | + if (unlikely(err)) { | |
2650 | + err = -EFAULT; | |
2651 | + AuTraceErr(err); | |
2652 | + goto out; | |
2653 | + } | |
2654 | + | |
2655 | + err = -EINVAL; | |
2656 | + si_read_lock(sb, AuLock_FLUSH); | |
2657 | + if (unlikely(ibusy.bindex < 0 || ibusy.bindex > au_sbend(sb))) | |
2658 | + goto out_unlock; | |
2659 | + | |
2660 | + err = 0; | |
2661 | + ibusy.h_ino = 0; /* invalid */ | |
2662 | + inode = ilookup(sb, ibusy.ino); | |
2663 | + if (!inode | |
2664 | + || inode->i_ino == AUFS_ROOT_INO | |
2665 | + || is_bad_inode(inode)) | |
2666 | + goto out_unlock; | |
2667 | + | |
2668 | + ii_read_lock_child(inode); | |
2669 | + bstart = au_ibstart(inode); | |
2670 | + bend = au_ibend(inode); | |
2671 | + if (bstart <= ibusy.bindex && ibusy.bindex <= bend) { | |
2672 | + h_inode = au_h_iptr(inode, ibusy.bindex); | |
2673 | + if (h_inode && au_test_ibusy(inode, bstart, bend)) | |
2674 | + ibusy.h_ino = h_inode->i_ino; | |
2675 | + } | |
2676 | + ii_read_unlock(inode); | |
2677 | + iput(inode); | |
2678 | + | |
2679 | +out_unlock: | |
2680 | + si_read_unlock(sb); | |
2681 | + if (!err) { | |
2682 | + err = __put_user(ibusy.h_ino, &arg->h_ino); | |
2683 | + if (unlikely(err)) { | |
2684 | + err = -EFAULT; | |
2685 | + AuTraceErr(err); | |
2686 | + } | |
2687 | + } | |
2688 | +out: | |
2689 | + return err; | |
2690 | +} | |
2691 | + | |
2692 | +long au_ibusy_ioctl(struct file *file, unsigned long arg) | |
2693 | +{ | |
2694 | + return au_ibusy(file->f_dentry->d_sb, (void __user *)arg); | |
2695 | +} | |
2696 | + | |
2697 | +#ifdef CONFIG_COMPAT | |
2698 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg) | |
2699 | +{ | |
2700 | + return au_ibusy(file->f_dentry->d_sb, compat_ptr(arg)); | |
2701 | +} | |
2702 | +#endif | |
2703 | + | |
2704 | +/* ---------------------------------------------------------------------- */ | |
2705 | + | |
1facf9fc | 2706 | +/* |
2707 | + * change a branch permission | |
2708 | + */ | |
2709 | + | |
dece6358 AM |
2710 | +static void au_warn_ima(void) |
2711 | +{ | |
2712 | +#ifdef CONFIG_IMA | |
1308ab2a | 2713 | + /* since it doesn't support mark_files_ro() */ |
027c5e7a | 2714 | + AuWarn1("RW -> RO makes IMA to produce wrong message\n"); |
dece6358 AM |
2715 | +#endif |
2716 | +} | |
2717 | + | |
1facf9fc | 2718 | +static int do_need_sigen_inc(int a, int b) |
2719 | +{ | |
2720 | + return au_br_whable(a) && !au_br_whable(b); | |
2721 | +} | |
2722 | + | |
2723 | +static int need_sigen_inc(int old, int new) | |
2724 | +{ | |
2725 | + return do_need_sigen_inc(old, new) | |
2726 | + || do_need_sigen_inc(new, old); | |
2727 | +} | |
2728 | + | |
7f207e10 AM |
2729 | +static unsigned long long au_farray_cb(void *a, |
2730 | + unsigned long long max __maybe_unused, | |
2731 | + void *arg) | |
2732 | +{ | |
2733 | + unsigned long long n; | |
2734 | + struct file **p, *f; | |
2735 | + struct super_block *sb = arg; | |
2736 | + | |
2737 | + n = 0; | |
2738 | + p = a; | |
2739 | + lg_global_lock(files_lglock); | |
2740 | + do_file_list_for_each_entry(sb, f) { | |
2741 | + if (au_fi(f) | |
027c5e7a | 2742 | + && file_count(f) |
7f207e10 AM |
2743 | + && !special_file(f->f_dentry->d_inode->i_mode)) { |
2744 | + get_file(f); | |
2745 | + *p++ = f; | |
2746 | + n++; | |
2747 | + AuDebugOn(n > max); | |
2748 | + } | |
2749 | + } while_file_list_for_each_entry; | |
2750 | + lg_global_unlock(files_lglock); | |
2751 | + | |
2752 | + return n; | |
2753 | +} | |
2754 | + | |
2755 | +static struct file **au_farray_alloc(struct super_block *sb, | |
2756 | + unsigned long long *max) | |
2757 | +{ | |
2758 | + *max = atomic_long_read(&au_sbi(sb)->si_nfiles); | |
2759 | + return au_array_alloc(max, au_farray_cb, sb); | |
2760 | +} | |
2761 | + | |
2762 | +static void au_farray_free(struct file **a, unsigned long long max) | |
2763 | +{ | |
2764 | + unsigned long long ull; | |
2765 | + | |
2766 | + for (ull = 0; ull < max; ull++) | |
2767 | + if (a[ull]) | |
2768 | + fput(a[ull]); | |
2769 | + au_array_free(a); | |
2770 | +} | |
2771 | + | |
1facf9fc | 2772 | +static int au_br_mod_files_ro(struct super_block *sb, aufs_bindex_t bindex) |
2773 | +{ | |
7f207e10 | 2774 | + int err, do_warn; |
027c5e7a | 2775 | + unsigned int mnt_flags; |
7f207e10 | 2776 | + unsigned long long ull, max; |
e49829fe | 2777 | + aufs_bindex_t br_id; |
027c5e7a | 2778 | + unsigned char verbose; |
7f207e10 | 2779 | + struct file *file, *hf, **array; |
e49829fe JR |
2780 | + struct inode *inode; |
2781 | + struct au_hfile *hfile; | |
1facf9fc | 2782 | + |
027c5e7a AM |
2783 | + mnt_flags = au_mntflags(sb); |
2784 | + verbose = !!au_opt_test(mnt_flags, VERBOSE); | |
2785 | + | |
7f207e10 AM |
2786 | + array = au_farray_alloc(sb, &max); |
2787 | + err = PTR_ERR(array); | |
2788 | + if (IS_ERR(array)) | |
1facf9fc | 2789 | + goto out; |
2790 | + | |
7f207e10 | 2791 | + do_warn = 0; |
e49829fe | 2792 | + br_id = au_sbr_id(sb, bindex); |
7f207e10 AM |
2793 | + for (ull = 0; ull < max; ull++) { |
2794 | + file = array[ull]; | |
1facf9fc | 2795 | + |
7f207e10 | 2796 | + /* AuDbg("%.*s\n", AuDLNPair(file->f_dentry)); */ |
1facf9fc | 2797 | + fi_read_lock(file); |
2798 | + if (unlikely(au_test_mmapped(file))) { | |
2799 | + err = -EBUSY; | |
027c5e7a AM |
2800 | + AuVerbose(verbose, "mmapped %.*s\n", |
2801 | + AuDLNPair(file->f_dentry)); | |
7f207e10 | 2802 | + AuDbgFile(file); |
1facf9fc | 2803 | + FiMustNoWaiters(file); |
2804 | + fi_read_unlock(file); | |
7f207e10 | 2805 | + goto out_array; |
1facf9fc | 2806 | + } |
2807 | + | |
027c5e7a | 2808 | + inode = file->f_dentry->d_inode; |
e49829fe JR |
2809 | + hfile = &au_fi(file)->fi_htop; |
2810 | + hf = hfile->hf_file; | |
2811 | + if (!S_ISREG(inode->i_mode) | |
1facf9fc | 2812 | + || !(file->f_mode & FMODE_WRITE) |
e49829fe | 2813 | + || hfile->hf_br->br_id != br_id |
7f207e10 AM |
2814 | + || !(hf->f_mode & FMODE_WRITE)) |
2815 | + array[ull] = NULL; | |
2816 | + else { | |
2817 | + do_warn = 1; | |
2818 | + get_file(file); | |
1facf9fc | 2819 | + } |
2820 | + | |
1facf9fc | 2821 | + FiMustNoWaiters(file); |
2822 | + fi_read_unlock(file); | |
7f207e10 AM |
2823 | + fput(file); |
2824 | + } | |
1facf9fc | 2825 | + |
2826 | + err = 0; | |
7f207e10 | 2827 | + if (do_warn) |
dece6358 | 2828 | + au_warn_ima(); |
7f207e10 AM |
2829 | + |
2830 | + for (ull = 0; ull < max; ull++) { | |
2831 | + file = array[ull]; | |
2832 | + if (!file) | |
2833 | + continue; | |
2834 | + | |
1facf9fc | 2835 | + /* todo: already flushed? */ |
2836 | + /* cf. fs/super.c:mark_files_ro() */ | |
7f207e10 AM |
2837 | + /* fi_read_lock(file); */ |
2838 | + hfile = &au_fi(file)->fi_htop; | |
2839 | + hf = hfile->hf_file; | |
2840 | + /* fi_read_unlock(file); */ | |
027c5e7a | 2841 | + spin_lock(&hf->f_lock); |
1facf9fc | 2842 | + hf->f_mode &= ~FMODE_WRITE; |
027c5e7a | 2843 | + spin_unlock(&hf->f_lock); |
1facf9fc | 2844 | + if (!file_check_writeable(hf)) { |
2845 | + file_release_write(hf); | |
2846 | + mnt_drop_write(hf->f_vfsmnt); | |
2847 | + } | |
2848 | + } | |
2849 | + | |
7f207e10 AM |
2850 | +out_array: |
2851 | + au_farray_free(array, max); | |
4f0767ce | 2852 | +out: |
7f207e10 | 2853 | + AuTraceErr(err); |
1facf9fc | 2854 | + return err; |
2855 | +} | |
2856 | + | |
2857 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 2858 | + int *do_refresh) |
1facf9fc | 2859 | +{ |
2860 | + int err, rerr; | |
2861 | + aufs_bindex_t bindex; | |
1308ab2a | 2862 | + struct path path; |
1facf9fc | 2863 | + struct dentry *root; |
2864 | + struct au_branch *br; | |
2865 | + | |
2866 | + root = sb->s_root; | |
1facf9fc | 2867 | + bindex = au_find_dbindex(root, mod->h_root); |
2868 | + if (bindex < 0) { | |
2869 | + if (remount) | |
2870 | + return 0; /* success */ | |
2871 | + err = -ENOENT; | |
4a4d8108 | 2872 | + pr_err("%s no such branch\n", mod->path); |
1facf9fc | 2873 | + goto out; |
2874 | + } | |
2875 | + AuDbg("bindex b%d\n", bindex); | |
2876 | + | |
2877 | + err = test_br(mod->h_root->d_inode, mod->perm, mod->path); | |
2878 | + if (unlikely(err)) | |
2879 | + goto out; | |
2880 | + | |
2881 | + br = au_sbr(sb, bindex); | |
2882 | + if (br->br_perm == mod->perm) | |
2883 | + return 0; /* success */ | |
2884 | + | |
2885 | + if (au_br_writable(br->br_perm)) { | |
2886 | + /* remove whiteout base */ | |
2887 | + err = au_br_init_wh(sb, br, mod->perm, mod->h_root); | |
2888 | + if (unlikely(err)) | |
2889 | + goto out; | |
2890 | + | |
2891 | + if (!au_br_writable(mod->perm)) { | |
2892 | + /* rw --> ro, file might be mmapped */ | |
2893 | + DiMustNoWaiters(root); | |
2894 | + IiMustNoWaiters(root->d_inode); | |
2895 | + di_write_unlock(root); | |
2896 | + err = au_br_mod_files_ro(sb, bindex); | |
2897 | + /* aufs_write_lock() calls ..._child() */ | |
2898 | + di_write_lock_child(root); | |
2899 | + | |
2900 | + if (unlikely(err)) { | |
2901 | + rerr = -ENOMEM; | |
2902 | + br->br_wbr = kmalloc(sizeof(*br->br_wbr), | |
2903 | + GFP_NOFS); | |
1308ab2a | 2904 | + if (br->br_wbr) { |
2905 | + path.mnt = br->br_mnt; | |
2906 | + path.dentry = mod->h_root; | |
2907 | + rerr = au_wbr_init(br, sb, br->br_perm, | |
2908 | + &path); | |
2909 | + } | |
1facf9fc | 2910 | + if (unlikely(rerr)) { |
2911 | + AuIOErr("nested error %d (%d)\n", | |
2912 | + rerr, err); | |
2913 | + br->br_perm = mod->perm; | |
2914 | + } | |
2915 | + } | |
2916 | + } | |
2917 | + } else if (au_br_writable(mod->perm)) { | |
2918 | + /* ro --> rw */ | |
2919 | + err = -ENOMEM; | |
2920 | + br->br_wbr = kmalloc(sizeof(*br->br_wbr), GFP_NOFS); | |
2921 | + if (br->br_wbr) { | |
1308ab2a | 2922 | + path.mnt = br->br_mnt; |
2923 | + path.dentry = mod->h_root; | |
1facf9fc | 2924 | + err = au_wbr_init(br, sb, mod->perm, &path); |
2925 | + if (unlikely(err)) { | |
2926 | + kfree(br->br_wbr); | |
2927 | + br->br_wbr = NULL; | |
2928 | + } | |
2929 | + } | |
2930 | + } | |
2931 | + | |
2932 | + if (!err) { | |
7f207e10 | 2933 | + *do_refresh |= need_sigen_inc(br->br_perm, mod->perm); |
1facf9fc | 2934 | + br->br_perm = mod->perm; |
2935 | + } | |
2936 | + | |
4f0767ce | 2937 | +out: |
7f207e10 | 2938 | + AuTraceErr(err); |
1facf9fc | 2939 | + return err; |
2940 | +} | |
7f207e10 AM |
2941 | diff -urN /usr/share/empty/fs/aufs/branch.h linux/fs/aufs/branch.h |
2942 | --- /usr/share/empty/fs/aufs/branch.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 2943 | +++ linux/fs/aufs/branch.h 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 2944 | @@ -0,0 +1,233 @@ |
1facf9fc | 2945 | +/* |
027c5e7a | 2946 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 2947 | + * |
2948 | + * This program, aufs is free software; you can redistribute it and/or modify | |
2949 | + * it under the terms of the GNU General Public License as published by | |
2950 | + * the Free Software Foundation; either version 2 of the License, or | |
2951 | + * (at your option) any later version. | |
dece6358 AM |
2952 | + * |
2953 | + * This program is distributed in the hope that it will be useful, | |
2954 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
2955 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
2956 | + * GNU General Public License for more details. | |
2957 | + * | |
2958 | + * You should have received a copy of the GNU General Public License | |
2959 | + * along with this program; if not, write to the Free Software | |
2960 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 2961 | + */ |
2962 | + | |
2963 | +/* | |
2964 | + * branch filesystems and xino for them | |
2965 | + */ | |
2966 | + | |
2967 | +#ifndef __AUFS_BRANCH_H__ | |
2968 | +#define __AUFS_BRANCH_H__ | |
2969 | + | |
2970 | +#ifdef __KERNEL__ | |
2971 | + | |
2972 | +#include <linux/fs.h> | |
2973 | +#include <linux/mount.h> | |
1facf9fc | 2974 | +#include <linux/aufs_type.h> |
4a4d8108 | 2975 | +#include "dynop.h" |
1facf9fc | 2976 | +#include "rwsem.h" |
2977 | +#include "super.h" | |
2978 | + | |
2979 | +/* ---------------------------------------------------------------------- */ | |
2980 | + | |
2981 | +/* a xino file */ | |
2982 | +struct au_xino_file { | |
2983 | + struct file *xi_file; | |
2984 | + struct mutex xi_nondir_mtx; | |
2985 | + | |
2986 | + /* todo: make xino files an array to support huge inode number */ | |
2987 | + | |
2988 | +#ifdef CONFIG_DEBUG_FS | |
2989 | + struct dentry *xi_dbgaufs; | |
2990 | +#endif | |
2991 | +}; | |
2992 | + | |
2993 | +/* members for writable branch only */ | |
2994 | +enum {AuBrWh_BASE, AuBrWh_PLINK, AuBrWh_ORPH, AuBrWh_Last}; | |
2995 | +struct au_wbr { | |
dece6358 | 2996 | + struct au_rwsem wbr_wh_rwsem; |
1facf9fc | 2997 | + struct dentry *wbr_wh[AuBrWh_Last]; |
4a4d8108 | 2998 | + atomic_t wbr_wh_running; |
1facf9fc | 2999 | +#define wbr_whbase wbr_wh[AuBrWh_BASE] /* whiteout base */ |
3000 | +#define wbr_plink wbr_wh[AuBrWh_PLINK] /* pseudo-link dir */ | |
3001 | +#define wbr_orph wbr_wh[AuBrWh_ORPH] /* dir for orphans */ | |
3002 | + | |
3003 | + /* mfs mode */ | |
3004 | + unsigned long long wbr_bytes; | |
3005 | +}; | |
3006 | + | |
4a4d8108 AM |
3007 | +/* ext2 has 3 types of operations at least, ext3 has 4 */ |
3008 | +#define AuBrDynOp (AuDyLast * 4) | |
3009 | + | |
1facf9fc | 3010 | +/* protected by superblock rwsem */ |
3011 | +struct au_branch { | |
3012 | + struct au_xino_file br_xino; | |
3013 | + | |
3014 | + aufs_bindex_t br_id; | |
3015 | + | |
3016 | + int br_perm; | |
3017 | + struct vfsmount *br_mnt; | |
4a4d8108 AM |
3018 | + spinlock_t br_dykey_lock; |
3019 | + struct au_dykey *br_dykey[AuBrDynOp]; | |
1facf9fc | 3020 | + atomic_t br_count; |
3021 | + | |
3022 | + struct au_wbr *br_wbr; | |
3023 | + | |
3024 | + /* xino truncation */ | |
3025 | + blkcnt_t br_xino_upper; /* watermark in blocks */ | |
3026 | + atomic_t br_xino_running; | |
3027 | + | |
027c5e7a AM |
3028 | +#ifdef CONFIG_AUFS_HFSNOTIFY |
3029 | + struct fsnotify_group *br_hfsn_group; | |
3030 | + struct fsnotify_ops br_hfsn_ops; | |
3031 | +#endif | |
3032 | + | |
1facf9fc | 3033 | +#ifdef CONFIG_SYSFS |
3034 | + /* an entry under sysfs per mount-point */ | |
3035 | + char br_name[8]; | |
3036 | + struct attribute br_attr; | |
3037 | +#endif | |
3038 | +}; | |
3039 | + | |
3040 | +/* ---------------------------------------------------------------------- */ | |
3041 | + | |
3042 | +/* branch permission and attribute */ | |
3043 | +enum { | |
3044 | + AuBrPerm_RW, /* writable, linkable wh */ | |
3045 | + AuBrPerm_RO, /* readonly, no wh */ | |
3046 | + AuBrPerm_RR, /* natively readonly, no wh */ | |
3047 | + | |
3048 | + AuBrPerm_RWNoLinkWH, /* un-linkable whiteouts */ | |
3049 | + | |
3050 | + AuBrPerm_ROWH, /* whiteout-able */ | |
3051 | + AuBrPerm_RRWH, /* whiteout-able */ | |
3052 | + | |
3053 | + AuBrPerm_Last | |
3054 | +}; | |
3055 | + | |
3056 | +static inline int au_br_writable(int brperm) | |
3057 | +{ | |
3058 | + return brperm == AuBrPerm_RW || brperm == AuBrPerm_RWNoLinkWH; | |
3059 | +} | |
3060 | + | |
3061 | +static inline int au_br_whable(int brperm) | |
3062 | +{ | |
3063 | + return brperm == AuBrPerm_RW | |
3064 | + || brperm == AuBrPerm_ROWH | |
3065 | + || brperm == AuBrPerm_RRWH; | |
3066 | +} | |
3067 | + | |
3068 | +static inline int au_br_rdonly(struct au_branch *br) | |
3069 | +{ | |
3070 | + return ((br->br_mnt->mnt_sb->s_flags & MS_RDONLY) | |
3071 | + || !au_br_writable(br->br_perm)) | |
3072 | + ? -EROFS : 0; | |
3073 | +} | |
3074 | + | |
4a4d8108 | 3075 | +static inline int au_br_hnotifyable(int brperm __maybe_unused) |
1facf9fc | 3076 | +{ |
4a4d8108 | 3077 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 3078 | + return brperm != AuBrPerm_RR && brperm != AuBrPerm_RRWH; |
3079 | +#else | |
3080 | + return 0; | |
3081 | +#endif | |
3082 | +} | |
3083 | + | |
3084 | +/* ---------------------------------------------------------------------- */ | |
3085 | + | |
3086 | +/* branch.c */ | |
3087 | +struct au_sbinfo; | |
3088 | +void au_br_free(struct au_sbinfo *sinfo); | |
3089 | +int au_br_index(struct super_block *sb, aufs_bindex_t br_id); | |
3090 | +struct au_opt_add; | |
3091 | +int au_br_add(struct super_block *sb, struct au_opt_add *add, int remount); | |
3092 | +struct au_opt_del; | |
3093 | +int au_br_del(struct super_block *sb, struct au_opt_del *del, int remount); | |
027c5e7a AM |
3094 | +long au_ibusy_ioctl(struct file *file, unsigned long arg); |
3095 | +#ifdef CONFIG_COMPAT | |
3096 | +long au_ibusy_compat_ioctl(struct file *file, unsigned long arg); | |
3097 | +#endif | |
1facf9fc | 3098 | +struct au_opt_mod; |
3099 | +int au_br_mod(struct super_block *sb, struct au_opt_mod *mod, int remount, | |
7f207e10 | 3100 | + int *do_refresh); |
1facf9fc | 3101 | + |
3102 | +/* xino.c */ | |
3103 | +static const loff_t au_loff_max = LLONG_MAX; | |
3104 | + | |
3105 | +int au_xib_trunc(struct super_block *sb); | |
3106 | +ssize_t xino_fread(au_readf_t func, struct file *file, void *buf, size_t size, | |
3107 | + loff_t *pos); | |
3108 | +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size, | |
3109 | + loff_t *pos); | |
3110 | +struct file *au_xino_create2(struct file *base_file, struct file *copy_src); | |
3111 | +struct file *au_xino_create(struct super_block *sb, char *fname, int silent); | |
3112 | +ino_t au_xino_new_ino(struct super_block *sb); | |
b752ccd1 | 3113 | +void au_xino_delete_inode(struct inode *inode, const int unlinked); |
1facf9fc | 3114 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
3115 | + ino_t ino); | |
3116 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
3117 | + ino_t *ino); | |
3118 | +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t hino, | |
3119 | + struct file *base_file, int do_test); | |
3120 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex); | |
3121 | + | |
3122 | +struct au_opt_xino; | |
3123 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount); | |
3124 | +void au_xino_clr(struct super_block *sb); | |
3125 | +struct file *au_xino_def(struct super_block *sb); | |
3126 | +int au_xino_path(struct seq_file *seq, struct file *file); | |
3127 | + | |
3128 | +/* ---------------------------------------------------------------------- */ | |
3129 | + | |
3130 | +/* Superblock to branch */ | |
3131 | +static inline | |
3132 | +aufs_bindex_t au_sbr_id(struct super_block *sb, aufs_bindex_t bindex) | |
3133 | +{ | |
3134 | + return au_sbr(sb, bindex)->br_id; | |
3135 | +} | |
3136 | + | |
3137 | +static inline | |
3138 | +struct vfsmount *au_sbr_mnt(struct super_block *sb, aufs_bindex_t bindex) | |
3139 | +{ | |
3140 | + return au_sbr(sb, bindex)->br_mnt; | |
3141 | +} | |
3142 | + | |
3143 | +static inline | |
3144 | +struct super_block *au_sbr_sb(struct super_block *sb, aufs_bindex_t bindex) | |
3145 | +{ | |
3146 | + return au_sbr_mnt(sb, bindex)->mnt_sb; | |
3147 | +} | |
3148 | + | |
3149 | +static inline void au_sbr_put(struct super_block *sb, aufs_bindex_t bindex) | |
3150 | +{ | |
e49829fe | 3151 | + atomic_dec(&au_sbr(sb, bindex)->br_count); |
1facf9fc | 3152 | +} |
3153 | + | |
3154 | +static inline int au_sbr_perm(struct super_block *sb, aufs_bindex_t bindex) | |
3155 | +{ | |
3156 | + return au_sbr(sb, bindex)->br_perm; | |
3157 | +} | |
3158 | + | |
3159 | +static inline int au_sbr_whable(struct super_block *sb, aufs_bindex_t bindex) | |
3160 | +{ | |
3161 | + return au_br_whable(au_sbr_perm(sb, bindex)); | |
3162 | +} | |
3163 | + | |
3164 | +/* ---------------------------------------------------------------------- */ | |
3165 | + | |
3166 | +/* | |
3167 | + * wbr_wh_read_lock, wbr_wh_write_lock | |
3168 | + * wbr_wh_read_unlock, wbr_wh_write_unlock, wbr_wh_downgrade_lock | |
3169 | + */ | |
3170 | +AuSimpleRwsemFuncs(wbr_wh, struct au_wbr *wbr, &wbr->wbr_wh_rwsem); | |
3171 | + | |
dece6358 AM |
3172 | +#define WbrWhMustNoWaiters(wbr) AuRwMustNoWaiters(&wbr->wbr_wh_rwsem) |
3173 | +#define WbrWhMustAnyLock(wbr) AuRwMustAnyLock(&wbr->wbr_wh_rwsem) | |
3174 | +#define WbrWhMustWriteLock(wbr) AuRwMustWriteLock(&wbr->wbr_wh_rwsem) | |
3175 | + | |
1facf9fc | 3176 | +#endif /* __KERNEL__ */ |
3177 | +#endif /* __AUFS_BRANCH_H__ */ | |
7f207e10 AM |
3178 | diff -urN /usr/share/empty/fs/aufs/conf.mk linux/fs/aufs/conf.mk |
3179 | --- /usr/share/empty/fs/aufs/conf.mk 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 3180 | +++ linux/fs/aufs/conf.mk 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 3181 | @@ -0,0 +1,38 @@ |
4a4d8108 AM |
3182 | + |
3183 | +AuConfStr = CONFIG_AUFS_FS=${CONFIG_AUFS_FS} | |
3184 | + | |
3185 | +define AuConf | |
3186 | +ifdef ${1} | |
3187 | +AuConfStr += ${1}=${${1}} | |
3188 | +endif | |
3189 | +endef | |
3190 | + | |
b752ccd1 | 3191 | +AuConfAll = BRANCH_MAX_127 BRANCH_MAX_511 BRANCH_MAX_1023 BRANCH_MAX_32767 \ |
e49829fe | 3192 | + SBILIST \ |
7f207e10 | 3193 | + HNOTIFY HFSNOTIFY \ |
4a4d8108 AM |
3194 | + EXPORT INO_T_64 \ |
3195 | + RDU \ | |
2cbb1c4b | 3196 | + PROC_MAP \ |
4a4d8108 AM |
3197 | + SP_IATTR \ |
3198 | + SHWH \ | |
3199 | + BR_RAMFS \ | |
3200 | + BR_FUSE POLL \ | |
3201 | + BR_HFSPLUS \ | |
3202 | + BDEV_LOOP \ | |
b752ccd1 AM |
3203 | + DEBUG MAGIC_SYSRQ |
3204 | +$(foreach i, ${AuConfAll}, \ | |
4a4d8108 AM |
3205 | + $(eval $(call AuConf,CONFIG_AUFS_${i}))) |
3206 | + | |
3207 | +AuConfName = ${obj}/conf.str | |
3208 | +${AuConfName}.tmp: FORCE | |
3209 | + @echo ${AuConfStr} | tr ' ' '\n' | sed -e 's/^/"/' -e 's/$$/\\n"/' > $@ | |
3210 | +${AuConfName}: ${AuConfName}.tmp | |
3211 | + @diff -q $< $@ > /dev/null 2>&1 || { \ | |
3212 | + echo ' GEN ' $@; \ | |
3213 | + cp -p $< $@; \ | |
3214 | + } | |
3215 | +FORCE: | |
3216 | +clean-files += ${AuConfName} ${AuConfName}.tmp | |
3217 | +${obj}/sysfs.o: ${AuConfName} | |
b752ccd1 AM |
3218 | + |
3219 | +-include ${srctree}/${src}/conf_priv.mk | |
7f207e10 AM |
3220 | diff -urN /usr/share/empty/fs/aufs/cpup.c linux/fs/aufs/cpup.c |
3221 | --- /usr/share/empty/fs/aufs/cpup.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
3222 | +++ linux/fs/aufs/cpup.c 2011-08-24 13:30:24.731313534 +0200 |
3223 | @@ -0,0 +1,1080 @@ | |
1facf9fc | 3224 | +/* |
027c5e7a | 3225 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 3226 | + * |
3227 | + * This program, aufs is free software; you can redistribute it and/or modify | |
3228 | + * it under the terms of the GNU General Public License as published by | |
3229 | + * the Free Software Foundation; either version 2 of the License, or | |
3230 | + * (at your option) any later version. | |
dece6358 AM |
3231 | + * |
3232 | + * This program is distributed in the hope that it will be useful, | |
3233 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
3234 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
3235 | + * GNU General Public License for more details. | |
3236 | + * | |
3237 | + * You should have received a copy of the GNU General Public License | |
3238 | + * along with this program; if not, write to the Free Software | |
3239 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 3240 | + */ |
3241 | + | |
3242 | +/* | |
3243 | + * copy-up functions, see wbr_policy.c for copy-down | |
3244 | + */ | |
3245 | + | |
dece6358 | 3246 | +#include <linux/file.h> |
1facf9fc | 3247 | +#include <linux/fs_stack.h> |
dece6358 | 3248 | +#include <linux/mm.h> |
1facf9fc | 3249 | +#include <linux/uaccess.h> |
3250 | +#include "aufs.h" | |
3251 | + | |
3252 | +void au_cpup_attr_flags(struct inode *dst, struct inode *src) | |
3253 | +{ | |
3254 | + const unsigned int mask = S_DEAD | S_SWAPFILE | S_PRIVATE | |
3255 | + | S_NOATIME | S_NOCMTIME; | |
3256 | + | |
3257 | + dst->i_flags |= src->i_flags & ~mask; | |
3258 | + if (au_test_fs_notime(dst->i_sb)) | |
3259 | + dst->i_flags |= S_NOATIME | S_NOCMTIME; | |
3260 | +} | |
3261 | + | |
3262 | +void au_cpup_attr_timesizes(struct inode *inode) | |
3263 | +{ | |
3264 | + struct inode *h_inode; | |
3265 | + | |
3266 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
3267 | + fsstack_copy_attr_times(inode, h_inode); | |
4a4d8108 | 3268 | + fsstack_copy_inode_size(inode, h_inode); |
1facf9fc | 3269 | +} |
3270 | + | |
3271 | +void au_cpup_attr_nlink(struct inode *inode, int force) | |
3272 | +{ | |
3273 | + struct inode *h_inode; | |
3274 | + struct super_block *sb; | |
3275 | + aufs_bindex_t bindex, bend; | |
3276 | + | |
3277 | + sb = inode->i_sb; | |
3278 | + bindex = au_ibstart(inode); | |
3279 | + h_inode = au_h_iptr(inode, bindex); | |
3280 | + if (!force | |
3281 | + && !S_ISDIR(h_inode->i_mode) | |
3282 | + && au_opt_test(au_mntflags(sb), PLINK) | |
3283 | + && au_plink_test(inode)) | |
3284 | + return; | |
3285 | + | |
3286 | + inode->i_nlink = h_inode->i_nlink; | |
3287 | + | |
3288 | + /* | |
3289 | + * fewer nlink makes find(1) noisy, but larger nlink doesn't. | |
3290 | + * it may includes whplink directory. | |
3291 | + */ | |
3292 | + if (S_ISDIR(h_inode->i_mode)) { | |
3293 | + bend = au_ibend(inode); | |
3294 | + for (bindex++; bindex <= bend; bindex++) { | |
3295 | + h_inode = au_h_iptr(inode, bindex); | |
3296 | + if (h_inode) | |
3297 | + au_add_nlink(inode, h_inode); | |
3298 | + } | |
3299 | + } | |
3300 | +} | |
3301 | + | |
3302 | +void au_cpup_attr_changeable(struct inode *inode) | |
3303 | +{ | |
3304 | + struct inode *h_inode; | |
3305 | + | |
3306 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
3307 | + inode->i_mode = h_inode->i_mode; | |
3308 | + inode->i_uid = h_inode->i_uid; | |
3309 | + inode->i_gid = h_inode->i_gid; | |
3310 | + au_cpup_attr_timesizes(inode); | |
3311 | + au_cpup_attr_flags(inode, h_inode); | |
3312 | +} | |
3313 | + | |
3314 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode) | |
3315 | +{ | |
3316 | + struct au_iinfo *iinfo = au_ii(inode); | |
3317 | + | |
1308ab2a | 3318 | + IiMustWriteLock(inode); |
3319 | + | |
1facf9fc | 3320 | + iinfo->ii_higen = h_inode->i_generation; |
3321 | + iinfo->ii_hsb1 = h_inode->i_sb; | |
3322 | +} | |
3323 | + | |
3324 | +void au_cpup_attr_all(struct inode *inode, int force) | |
3325 | +{ | |
3326 | + struct inode *h_inode; | |
3327 | + | |
3328 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
3329 | + au_cpup_attr_changeable(inode); | |
3330 | + if (inode->i_nlink > 0) | |
3331 | + au_cpup_attr_nlink(inode, force); | |
3332 | + inode->i_rdev = h_inode->i_rdev; | |
3333 | + inode->i_blkbits = h_inode->i_blkbits; | |
3334 | + au_cpup_igen(inode, h_inode); | |
3335 | +} | |
3336 | + | |
3337 | +/* ---------------------------------------------------------------------- */ | |
3338 | + | |
3339 | +/* Note: dt_dentry and dt_h_dentry are not dget/dput-ed */ | |
3340 | + | |
3341 | +/* keep the timestamps of the parent dir when cpup */ | |
3342 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
3343 | + struct path *h_path) | |
3344 | +{ | |
3345 | + struct inode *h_inode; | |
3346 | + | |
3347 | + dt->dt_dentry = dentry; | |
3348 | + dt->dt_h_path = *h_path; | |
3349 | + h_inode = h_path->dentry->d_inode; | |
3350 | + dt->dt_atime = h_inode->i_atime; | |
3351 | + dt->dt_mtime = h_inode->i_mtime; | |
3352 | + /* smp_mb(); */ | |
3353 | +} | |
3354 | + | |
3355 | +void au_dtime_revert(struct au_dtime *dt) | |
3356 | +{ | |
3357 | + struct iattr attr; | |
3358 | + int err; | |
3359 | + | |
3360 | + attr.ia_atime = dt->dt_atime; | |
3361 | + attr.ia_mtime = dt->dt_mtime; | |
3362 | + attr.ia_valid = ATTR_FORCE | ATTR_MTIME | ATTR_MTIME_SET | |
3363 | + | ATTR_ATIME | ATTR_ATIME_SET; | |
3364 | + | |
3365 | + err = vfsub_notify_change(&dt->dt_h_path, &attr); | |
3366 | + if (unlikely(err)) | |
4a4d8108 | 3367 | + pr_warning("restoring timestamps failed(%d). ignored\n", err); |
1facf9fc | 3368 | +} |
3369 | + | |
3370 | +/* ---------------------------------------------------------------------- */ | |
3371 | + | |
3372 | +static noinline_for_stack | |
3373 | +int cpup_iattr(struct dentry *dst, aufs_bindex_t bindex, struct dentry *h_src) | |
3374 | +{ | |
3375 | + int err, sbits; | |
3376 | + struct iattr ia; | |
3377 | + struct path h_path; | |
1308ab2a | 3378 | + struct inode *h_isrc, *h_idst; |
1facf9fc | 3379 | + |
3380 | + h_path.dentry = au_h_dptr(dst, bindex); | |
1308ab2a | 3381 | + h_idst = h_path.dentry->d_inode; |
1facf9fc | 3382 | + h_path.mnt = au_sbr_mnt(dst->d_sb, bindex); |
3383 | + h_isrc = h_src->d_inode; | |
1308ab2a | 3384 | + ia.ia_valid = ATTR_FORCE | ATTR_UID | ATTR_GID |
1facf9fc | 3385 | + | ATTR_ATIME | ATTR_MTIME |
3386 | + | ATTR_ATIME_SET | ATTR_MTIME_SET; | |
1facf9fc | 3387 | + ia.ia_uid = h_isrc->i_uid; |
3388 | + ia.ia_gid = h_isrc->i_gid; | |
3389 | + ia.ia_atime = h_isrc->i_atime; | |
3390 | + ia.ia_mtime = h_isrc->i_mtime; | |
1308ab2a | 3391 | + if (h_idst->i_mode != h_isrc->i_mode |
3392 | + && !S_ISLNK(h_idst->i_mode)) { | |
3393 | + ia.ia_valid |= ATTR_MODE; | |
3394 | + ia.ia_mode = h_isrc->i_mode; | |
3395 | + } | |
3396 | + sbits = !!(h_isrc->i_mode & (S_ISUID | S_ISGID)); | |
3397 | + au_cpup_attr_flags(h_idst, h_isrc); | |
1facf9fc | 3398 | + err = vfsub_notify_change(&h_path, &ia); |
3399 | + | |
3400 | + /* is this nfs only? */ | |
3401 | + if (!err && sbits && au_test_nfs(h_path.dentry->d_sb)) { | |
3402 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
3403 | + ia.ia_mode = h_isrc->i_mode; | |
3404 | + err = vfsub_notify_change(&h_path, &ia); | |
3405 | + } | |
3406 | + | |
3407 | + return err; | |
3408 | +} | |
3409 | + | |
3410 | +/* ---------------------------------------------------------------------- */ | |
3411 | + | |
3412 | +static int au_do_copy_file(struct file *dst, struct file *src, loff_t len, | |
3413 | + char *buf, unsigned long blksize) | |
3414 | +{ | |
3415 | + int err; | |
3416 | + size_t sz, rbytes, wbytes; | |
3417 | + unsigned char all_zero; | |
3418 | + char *p, *zp; | |
3419 | + struct mutex *h_mtx; | |
3420 | + /* reduce stack usage */ | |
3421 | + struct iattr *ia; | |
3422 | + | |
3423 | + zp = page_address(ZERO_PAGE(0)); | |
3424 | + if (unlikely(!zp)) | |
3425 | + return -ENOMEM; /* possible? */ | |
3426 | + | |
3427 | + err = 0; | |
3428 | + all_zero = 0; | |
3429 | + while (len) { | |
3430 | + AuDbg("len %lld\n", len); | |
3431 | + sz = blksize; | |
3432 | + if (len < blksize) | |
3433 | + sz = len; | |
3434 | + | |
3435 | + rbytes = 0; | |
3436 | + /* todo: signal_pending? */ | |
3437 | + while (!rbytes || err == -EAGAIN || err == -EINTR) { | |
3438 | + rbytes = vfsub_read_k(src, buf, sz, &src->f_pos); | |
3439 | + err = rbytes; | |
3440 | + } | |
3441 | + if (unlikely(err < 0)) | |
3442 | + break; | |
3443 | + | |
3444 | + all_zero = 0; | |
3445 | + if (len >= rbytes && rbytes == blksize) | |
3446 | + all_zero = !memcmp(buf, zp, rbytes); | |
3447 | + if (!all_zero) { | |
3448 | + wbytes = rbytes; | |
3449 | + p = buf; | |
3450 | + while (wbytes) { | |
3451 | + size_t b; | |
3452 | + | |
3453 | + b = vfsub_write_k(dst, p, wbytes, &dst->f_pos); | |
3454 | + err = b; | |
3455 | + /* todo: signal_pending? */ | |
3456 | + if (unlikely(err == -EAGAIN || err == -EINTR)) | |
3457 | + continue; | |
3458 | + if (unlikely(err < 0)) | |
3459 | + break; | |
3460 | + wbytes -= b; | |
3461 | + p += b; | |
3462 | + } | |
3463 | + } else { | |
3464 | + loff_t res; | |
3465 | + | |
3466 | + AuLabel(hole); | |
3467 | + res = vfsub_llseek(dst, rbytes, SEEK_CUR); | |
3468 | + err = res; | |
3469 | + if (unlikely(res < 0)) | |
3470 | + break; | |
3471 | + } | |
3472 | + len -= rbytes; | |
3473 | + err = 0; | |
3474 | + } | |
3475 | + | |
3476 | + /* the last block may be a hole */ | |
3477 | + if (!err && all_zero) { | |
3478 | + AuLabel(last hole); | |
3479 | + | |
3480 | + err = 1; | |
3481 | + if (au_test_nfs(dst->f_dentry->d_sb)) { | |
3482 | + /* nfs requires this step to make last hole */ | |
3483 | + /* is this only nfs? */ | |
3484 | + do { | |
3485 | + /* todo: signal_pending? */ | |
3486 | + err = vfsub_write_k(dst, "\0", 1, &dst->f_pos); | |
3487 | + } while (err == -EAGAIN || err == -EINTR); | |
3488 | + if (err == 1) | |
3489 | + dst->f_pos--; | |
3490 | + } | |
3491 | + | |
3492 | + if (err == 1) { | |
3493 | + ia = (void *)buf; | |
3494 | + ia->ia_size = dst->f_pos; | |
3495 | + ia->ia_valid = ATTR_SIZE | ATTR_FILE; | |
3496 | + ia->ia_file = dst; | |
3497 | + h_mtx = &dst->f_dentry->d_inode->i_mutex; | |
3498 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD2); | |
3499 | + err = vfsub_notify_change(&dst->f_path, ia); | |
3500 | + mutex_unlock(h_mtx); | |
3501 | + } | |
3502 | + } | |
3503 | + | |
3504 | + return err; | |
3505 | +} | |
3506 | + | |
3507 | +int au_copy_file(struct file *dst, struct file *src, loff_t len) | |
3508 | +{ | |
3509 | + int err; | |
3510 | + unsigned long blksize; | |
3511 | + unsigned char do_kfree; | |
3512 | + char *buf; | |
3513 | + | |
3514 | + err = -ENOMEM; | |
3515 | + blksize = dst->f_dentry->d_sb->s_blocksize; | |
3516 | + if (!blksize || PAGE_SIZE < blksize) | |
3517 | + blksize = PAGE_SIZE; | |
3518 | + AuDbg("blksize %lu\n", blksize); | |
3519 | + do_kfree = (blksize != PAGE_SIZE && blksize >= sizeof(struct iattr *)); | |
3520 | + if (do_kfree) | |
3521 | + buf = kmalloc(blksize, GFP_NOFS); | |
3522 | + else | |
3523 | + buf = (void *)__get_free_page(GFP_NOFS); | |
3524 | + if (unlikely(!buf)) | |
3525 | + goto out; | |
3526 | + | |
3527 | + if (len > (1 << 22)) | |
3528 | + AuDbg("copying a large file %lld\n", (long long)len); | |
3529 | + | |
3530 | + src->f_pos = 0; | |
3531 | + dst->f_pos = 0; | |
3532 | + err = au_do_copy_file(dst, src, len, buf, blksize); | |
3533 | + if (do_kfree) | |
3534 | + kfree(buf); | |
3535 | + else | |
3536 | + free_page((unsigned long)buf); | |
3537 | + | |
4f0767ce | 3538 | +out: |
1facf9fc | 3539 | + return err; |
3540 | +} | |
3541 | + | |
3542 | +/* | |
3543 | + * to support a sparse file which is opened with O_APPEND, | |
3544 | + * we need to close the file. | |
3545 | + */ | |
3546 | +static int au_cp_regular(struct dentry *dentry, aufs_bindex_t bdst, | |
4a4d8108 | 3547 | + aufs_bindex_t bsrc, loff_t len) |
1facf9fc | 3548 | +{ |
3549 | + int err, i; | |
3550 | + enum { SRC, DST }; | |
3551 | + struct { | |
3552 | + aufs_bindex_t bindex; | |
3553 | + unsigned int flags; | |
3554 | + struct dentry *dentry; | |
3555 | + struct file *file; | |
3556 | + void *label, *label_file; | |
3557 | + } *f, file[] = { | |
3558 | + { | |
3559 | + .bindex = bsrc, | |
3560 | + .flags = O_RDONLY | O_NOATIME | O_LARGEFILE, | |
3561 | + .file = NULL, | |
3562 | + .label = &&out, | |
3563 | + .label_file = &&out_src | |
3564 | + }, | |
3565 | + { | |
3566 | + .bindex = bdst, | |
3567 | + .flags = O_WRONLY | O_NOATIME | O_LARGEFILE, | |
3568 | + .file = NULL, | |
3569 | + .label = &&out_src, | |
3570 | + .label_file = &&out_dst | |
3571 | + } | |
3572 | + }; | |
3573 | + struct super_block *sb; | |
3574 | + | |
3575 | + /* bsrc branch can be ro/rw. */ | |
3576 | + sb = dentry->d_sb; | |
3577 | + f = file; | |
3578 | + for (i = 0; i < 2; i++, f++) { | |
3579 | + f->dentry = au_h_dptr(dentry, f->bindex); | |
3580 | + f->file = au_h_open(dentry, f->bindex, f->flags, /*file*/NULL); | |
3581 | + err = PTR_ERR(f->file); | |
3582 | + if (IS_ERR(f->file)) | |
3583 | + goto *f->label; | |
3584 | + err = -EINVAL; | |
3585 | + if (unlikely(!f->file->f_op)) | |
3586 | + goto *f->label_file; | |
3587 | + } | |
3588 | + | |
3589 | + /* try stopping to update while we copyup */ | |
3590 | + IMustLock(file[SRC].dentry->d_inode); | |
3591 | + err = au_copy_file(file[DST].file, file[SRC].file, len); | |
3592 | + | |
4f0767ce | 3593 | +out_dst: |
1facf9fc | 3594 | + fput(file[DST].file); |
3595 | + au_sbr_put(sb, file[DST].bindex); | |
4f0767ce | 3596 | +out_src: |
1facf9fc | 3597 | + fput(file[SRC].file); |
3598 | + au_sbr_put(sb, file[SRC].bindex); | |
4f0767ce | 3599 | +out: |
1facf9fc | 3600 | + return err; |
3601 | +} | |
3602 | + | |
3603 | +static int au_do_cpup_regular(struct dentry *dentry, aufs_bindex_t bdst, | |
3604 | + aufs_bindex_t bsrc, loff_t len, | |
3605 | + struct inode *h_dir, struct path *h_path) | |
3606 | +{ | |
3607 | + int err, rerr; | |
3608 | + loff_t l; | |
3609 | + | |
3610 | + err = 0; | |
3611 | + l = i_size_read(au_h_iptr(dentry->d_inode, bsrc)); | |
3612 | + if (len == -1 || l < len) | |
3613 | + len = l; | |
3614 | + if (len) | |
3615 | + err = au_cp_regular(dentry, bdst, bsrc, len); | |
3616 | + if (!err) | |
3617 | + goto out; /* success */ | |
3618 | + | |
3619 | + rerr = vfsub_unlink(h_dir, h_path, /*force*/0); | |
3620 | + if (rerr) { | |
3621 | + AuIOErr("failed unlinking cpup-ed %.*s(%d, %d)\n", | |
3622 | + AuDLNPair(h_path->dentry), err, rerr); | |
3623 | + err = -EIO; | |
3624 | + } | |
3625 | + | |
4f0767ce | 3626 | +out: |
1facf9fc | 3627 | + return err; |
3628 | +} | |
3629 | + | |
3630 | +static int au_do_cpup_symlink(struct path *h_path, struct dentry *h_src, | |
3631 | + struct inode *h_dir) | |
3632 | +{ | |
3633 | + int err, symlen; | |
3634 | + mm_segment_t old_fs; | |
b752ccd1 AM |
3635 | + union { |
3636 | + char *k; | |
3637 | + char __user *u; | |
3638 | + } sym; | |
1facf9fc | 3639 | + |
3640 | + err = -ENOSYS; | |
3641 | + if (unlikely(!h_src->d_inode->i_op->readlink)) | |
3642 | + goto out; | |
3643 | + | |
3644 | + err = -ENOMEM; | |
b752ccd1 AM |
3645 | + sym.k = __getname_gfp(GFP_NOFS); |
3646 | + if (unlikely(!sym.k)) | |
1facf9fc | 3647 | + goto out; |
3648 | + | |
3649 | + old_fs = get_fs(); | |
3650 | + set_fs(KERNEL_DS); | |
b752ccd1 | 3651 | + symlen = h_src->d_inode->i_op->readlink(h_src, sym.u, PATH_MAX); |
1facf9fc | 3652 | + err = symlen; |
3653 | + set_fs(old_fs); | |
3654 | + | |
3655 | + if (symlen > 0) { | |
b752ccd1 AM |
3656 | + sym.k[symlen] = 0; |
3657 | + err = vfsub_symlink(h_dir, h_path, sym.k); | |
1facf9fc | 3658 | + } |
b752ccd1 | 3659 | + __putname(sym.k); |
1facf9fc | 3660 | + |
4f0767ce | 3661 | +out: |
1facf9fc | 3662 | + return err; |
3663 | +} | |
3664 | + | |
3665 | +/* return with the lower dst inode is locked */ | |
3666 | +static noinline_for_stack | |
3667 | +int cpup_entry(struct dentry *dentry, aufs_bindex_t bdst, | |
3668 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
3669 | + struct dentry *dst_parent) | |
3670 | +{ | |
3671 | + int err; | |
3672 | + umode_t mode; | |
3673 | + unsigned int mnt_flags; | |
3674 | + unsigned char isdir; | |
3675 | + const unsigned char do_dt = !!au_ftest_cpup(flags, DTIME); | |
3676 | + struct au_dtime dt; | |
3677 | + struct path h_path; | |
3678 | + struct dentry *h_src, *h_dst, *h_parent; | |
3679 | + struct inode *h_inode, *h_dir; | |
3680 | + struct super_block *sb; | |
3681 | + | |
3682 | + /* bsrc branch can be ro/rw. */ | |
3683 | + h_src = au_h_dptr(dentry, bsrc); | |
3684 | + h_inode = h_src->d_inode; | |
3685 | + AuDebugOn(h_inode != au_h_iptr(dentry->d_inode, bsrc)); | |
3686 | + | |
3687 | + /* try stopping to be referenced while we are creating */ | |
3688 | + h_dst = au_h_dptr(dentry, bdst); | |
3689 | + h_parent = h_dst->d_parent; /* dir inode is locked */ | |
3690 | + h_dir = h_parent->d_inode; | |
3691 | + IMustLock(h_dir); | |
3692 | + AuDebugOn(h_parent != h_dst->d_parent); | |
3693 | + | |
3694 | + sb = dentry->d_sb; | |
3695 | + h_path.mnt = au_sbr_mnt(sb, bdst); | |
3696 | + if (do_dt) { | |
3697 | + h_path.dentry = h_parent; | |
3698 | + au_dtime_store(&dt, dst_parent, &h_path); | |
3699 | + } | |
3700 | + h_path.dentry = h_dst; | |
3701 | + | |
3702 | + isdir = 0; | |
3703 | + mode = h_inode->i_mode; | |
3704 | + switch (mode & S_IFMT) { | |
3705 | + case S_IFREG: | |
3706 | + /* try stopping to update while we are referencing */ | |
3707 | + IMustLock(h_inode); | |
3708 | + err = vfsub_create(h_dir, &h_path, mode | S_IWUSR); | |
3709 | + if (!err) | |
3710 | + err = au_do_cpup_regular | |
3711 | + (dentry, bdst, bsrc, len, | |
3712 | + au_h_iptr(dst_parent->d_inode, bdst), &h_path); | |
3713 | + break; | |
3714 | + case S_IFDIR: | |
3715 | + isdir = 1; | |
3716 | + err = vfsub_mkdir(h_dir, &h_path, mode); | |
3717 | + if (!err) { | |
3718 | + /* | |
3719 | + * strange behaviour from the users view, | |
3720 | + * particularry setattr case | |
3721 | + */ | |
3722 | + if (au_ibstart(dst_parent->d_inode) == bdst) | |
3723 | + au_cpup_attr_nlink(dst_parent->d_inode, | |
3724 | + /*force*/1); | |
3725 | + au_cpup_attr_nlink(dentry->d_inode, /*force*/1); | |
3726 | + } | |
3727 | + break; | |
3728 | + case S_IFLNK: | |
3729 | + err = au_do_cpup_symlink(&h_path, h_src, h_dir); | |
3730 | + break; | |
3731 | + case S_IFCHR: | |
3732 | + case S_IFBLK: | |
3733 | + AuDebugOn(!capable(CAP_MKNOD)); | |
3734 | + /*FALLTHROUGH*/ | |
3735 | + case S_IFIFO: | |
3736 | + case S_IFSOCK: | |
3737 | + err = vfsub_mknod(h_dir, &h_path, mode, h_inode->i_rdev); | |
3738 | + break; | |
3739 | + default: | |
3740 | + AuIOErr("Unknown inode type 0%o\n", mode); | |
3741 | + err = -EIO; | |
3742 | + } | |
3743 | + | |
3744 | + mnt_flags = au_mntflags(sb); | |
3745 | + if (!au_opt_test(mnt_flags, UDBA_NONE) | |
3746 | + && !isdir | |
3747 | + && au_opt_test(mnt_flags, XINO) | |
3748 | + && h_inode->i_nlink == 1 | |
3749 | + /* todo: unnecessary? */ | |
3750 | + /* && dentry->d_inode->i_nlink == 1 */ | |
3751 | + && bdst < bsrc | |
3752 | + && !au_ftest_cpup(flags, KEEPLINO)) | |
1308ab2a | 3753 | + au_xino_write(sb, bsrc, h_inode->i_ino, /*ino*/0); |
1facf9fc | 3754 | + /* ignore this error */ |
3755 | + | |
3756 | + if (do_dt) | |
3757 | + au_dtime_revert(&dt); | |
3758 | + return err; | |
3759 | +} | |
3760 | + | |
3761 | +/* | |
3762 | + * copyup the @dentry from @bsrc to @bdst. | |
3763 | + * the caller must set the both of lower dentries. | |
3764 | + * @len is for truncating when it is -1 copyup the entire file. | |
3765 | + * in link/rename cases, @dst_parent may be different from the real one. | |
3766 | + */ | |
3767 | +static int au_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, | |
3768 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
3769 | + struct dentry *dst_parent) | |
3770 | +{ | |
3771 | + int err, rerr; | |
3772 | + aufs_bindex_t old_ibstart; | |
3773 | + unsigned char isdir, plink; | |
3774 | + struct au_dtime dt; | |
3775 | + struct path h_path; | |
3776 | + struct dentry *h_src, *h_dst, *h_parent; | |
3777 | + struct inode *dst_inode, *h_dir, *inode; | |
3778 | + struct super_block *sb; | |
3779 | + | |
3780 | + AuDebugOn(bsrc <= bdst); | |
3781 | + | |
3782 | + sb = dentry->d_sb; | |
3783 | + h_path.mnt = au_sbr_mnt(sb, bdst); | |
3784 | + h_dst = au_h_dptr(dentry, bdst); | |
3785 | + h_parent = h_dst->d_parent; /* dir inode is locked */ | |
3786 | + h_dir = h_parent->d_inode; | |
3787 | + IMustLock(h_dir); | |
3788 | + | |
3789 | + h_src = au_h_dptr(dentry, bsrc); | |
3790 | + inode = dentry->d_inode; | |
3791 | + | |
3792 | + if (!dst_parent) | |
3793 | + dst_parent = dget_parent(dentry); | |
3794 | + else | |
3795 | + dget(dst_parent); | |
3796 | + | |
3797 | + plink = !!au_opt_test(au_mntflags(sb), PLINK); | |
3798 | + dst_inode = au_h_iptr(inode, bdst); | |
3799 | + if (dst_inode) { | |
3800 | + if (unlikely(!plink)) { | |
3801 | + err = -EIO; | |
027c5e7a AM |
3802 | + AuIOErr("hi%lu(i%lu) exists on b%d " |
3803 | + "but plink is disabled\n", | |
3804 | + dst_inode->i_ino, inode->i_ino, bdst); | |
1facf9fc | 3805 | + goto out; |
3806 | + } | |
3807 | + | |
3808 | + if (dst_inode->i_nlink) { | |
3809 | + const int do_dt = au_ftest_cpup(flags, DTIME); | |
3810 | + | |
3811 | + h_src = au_plink_lkup(inode, bdst); | |
3812 | + err = PTR_ERR(h_src); | |
3813 | + if (IS_ERR(h_src)) | |
3814 | + goto out; | |
3815 | + if (unlikely(!h_src->d_inode)) { | |
3816 | + err = -EIO; | |
3817 | + AuIOErr("i%lu exists on a upper branch " | |
027c5e7a AM |
3818 | + "but not pseudo-linked\n", |
3819 | + inode->i_ino); | |
1facf9fc | 3820 | + dput(h_src); |
3821 | + goto out; | |
3822 | + } | |
3823 | + | |
3824 | + if (do_dt) { | |
3825 | + h_path.dentry = h_parent; | |
3826 | + au_dtime_store(&dt, dst_parent, &h_path); | |
3827 | + } | |
3828 | + h_path.dentry = h_dst; | |
3829 | + err = vfsub_link(h_src, h_dir, &h_path); | |
3830 | + if (do_dt) | |
3831 | + au_dtime_revert(&dt); | |
3832 | + dput(h_src); | |
3833 | + goto out; | |
3834 | + } else | |
3835 | + /* todo: cpup_wh_file? */ | |
3836 | + /* udba work */ | |
4a4d8108 | 3837 | + au_update_ibrange(inode, /*do_put_zero*/1); |
1facf9fc | 3838 | + } |
3839 | + | |
3840 | + old_ibstart = au_ibstart(inode); | |
3841 | + err = cpup_entry(dentry, bdst, bsrc, len, flags, dst_parent); | |
3842 | + if (unlikely(err)) | |
3843 | + goto out; | |
3844 | + dst_inode = h_dst->d_inode; | |
3845 | + mutex_lock_nested(&dst_inode->i_mutex, AuLsc_I_CHILD2); | |
3846 | + | |
3847 | + err = cpup_iattr(dentry, bdst, h_src); | |
3848 | + isdir = S_ISDIR(dst_inode->i_mode); | |
3849 | + if (!err) { | |
4a4d8108 AM |
3850 | + if (bdst < old_ibstart) { |
3851 | + if (S_ISREG(inode->i_mode)) { | |
3852 | + err = au_dy_iaop(inode, bdst, dst_inode); | |
3853 | + if (unlikely(err)) | |
3854 | + goto out_rev; | |
3855 | + } | |
1facf9fc | 3856 | + au_set_ibstart(inode, bdst); |
4a4d8108 | 3857 | + } |
1facf9fc | 3858 | + au_set_h_iptr(inode, bdst, au_igrab(dst_inode), |
3859 | + au_hi_flags(inode, isdir)); | |
3860 | + mutex_unlock(&dst_inode->i_mutex); | |
3861 | + if (!isdir | |
3862 | + && h_src->d_inode->i_nlink > 1 | |
3863 | + && plink) | |
3864 | + au_plink_append(inode, bdst, h_dst); | |
3865 | + goto out; /* success */ | |
3866 | + } | |
3867 | + | |
3868 | + /* revert */ | |
4a4d8108 | 3869 | +out_rev: |
1facf9fc | 3870 | + h_path.dentry = h_parent; |
3871 | + mutex_unlock(&dst_inode->i_mutex); | |
3872 | + au_dtime_store(&dt, dst_parent, &h_path); | |
3873 | + h_path.dentry = h_dst; | |
3874 | + if (!isdir) | |
3875 | + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
3876 | + else | |
3877 | + rerr = vfsub_rmdir(h_dir, &h_path); | |
3878 | + au_dtime_revert(&dt); | |
3879 | + if (rerr) { | |
3880 | + AuIOErr("failed removing broken entry(%d, %d)\n", err, rerr); | |
3881 | + err = -EIO; | |
3882 | + } | |
3883 | + | |
4f0767ce | 3884 | +out: |
1facf9fc | 3885 | + dput(dst_parent); |
3886 | + return err; | |
3887 | +} | |
3888 | + | |
3889 | +struct au_cpup_single_args { | |
3890 | + int *errp; | |
3891 | + struct dentry *dentry; | |
3892 | + aufs_bindex_t bdst, bsrc; | |
3893 | + loff_t len; | |
3894 | + unsigned int flags; | |
3895 | + struct dentry *dst_parent; | |
3896 | +}; | |
3897 | + | |
3898 | +static void au_call_cpup_single(void *args) | |
3899 | +{ | |
3900 | + struct au_cpup_single_args *a = args; | |
3901 | + *a->errp = au_cpup_single(a->dentry, a->bdst, a->bsrc, a->len, | |
3902 | + a->flags, a->dst_parent); | |
3903 | +} | |
3904 | + | |
53392da6 AM |
3905 | +/* |
3906 | + * prevent SIGXFSZ in copy-up. | |
3907 | + * testing CAP_MKNOD is for generic fs, | |
3908 | + * but CAP_FSETID is for xfs only, currently. | |
3909 | + */ | |
3910 | +static int au_cpup_sio_test(struct super_block *sb, umode_t mode) | |
3911 | +{ | |
3912 | + int do_sio; | |
3913 | + | |
3914 | + do_sio = 0; | |
3915 | + if (!au_wkq_test() | |
3916 | + && (!au_sbi(sb)->si_plink_maint_pid | |
3917 | + || au_plink_maint(sb, AuLock_NOPLM))) { | |
3918 | + switch (mode & S_IFMT) { | |
3919 | + case S_IFREG: | |
3920 | + /* no condition about RLIMIT_FSIZE and the file size */ | |
3921 | + do_sio = 1; | |
3922 | + break; | |
3923 | + case S_IFCHR: | |
3924 | + case S_IFBLK: | |
3925 | + do_sio = !capable(CAP_MKNOD); | |
3926 | + break; | |
3927 | + } | |
3928 | + if (!do_sio) | |
3929 | + do_sio = ((mode & (S_ISUID | S_ISGID)) | |
3930 | + && !capable(CAP_FSETID)); | |
3931 | + } | |
3932 | + | |
3933 | + return do_sio; | |
3934 | +} | |
3935 | + | |
1facf9fc | 3936 | +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, |
3937 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
3938 | + struct dentry *dst_parent) | |
3939 | +{ | |
3940 | + int err, wkq_err; | |
1facf9fc | 3941 | + struct dentry *h_dentry; |
3942 | + | |
3943 | + h_dentry = au_h_dptr(dentry, bsrc); | |
53392da6 | 3944 | + if (!au_cpup_sio_test(dentry->d_sb, h_dentry->d_inode->i_mode)) |
1facf9fc | 3945 | + err = au_cpup_single(dentry, bdst, bsrc, len, flags, |
3946 | + dst_parent); | |
3947 | + else { | |
3948 | + struct au_cpup_single_args args = { | |
3949 | + .errp = &err, | |
3950 | + .dentry = dentry, | |
3951 | + .bdst = bdst, | |
3952 | + .bsrc = bsrc, | |
3953 | + .len = len, | |
3954 | + .flags = flags, | |
3955 | + .dst_parent = dst_parent | |
3956 | + }; | |
3957 | + wkq_err = au_wkq_wait(au_call_cpup_single, &args); | |
3958 | + if (unlikely(wkq_err)) | |
3959 | + err = wkq_err; | |
3960 | + } | |
3961 | + | |
3962 | + return err; | |
3963 | +} | |
3964 | + | |
3965 | +/* | |
3966 | + * copyup the @dentry from the first active lower branch to @bdst, | |
3967 | + * using au_cpup_single(). | |
3968 | + */ | |
3969 | +static int au_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
3970 | + unsigned int flags) | |
3971 | +{ | |
3972 | + int err; | |
3973 | + aufs_bindex_t bsrc, bend; | |
3974 | + | |
3975 | + bend = au_dbend(dentry); | |
3976 | + for (bsrc = bdst + 1; bsrc <= bend; bsrc++) | |
3977 | + if (au_h_dptr(dentry, bsrc)) | |
3978 | + break; | |
3979 | + | |
3980 | + err = au_lkup_neg(dentry, bdst); | |
3981 | + if (!err) { | |
3982 | + err = au_cpup_single(dentry, bdst, bsrc, len, flags, NULL); | |
3983 | + if (!err) | |
3984 | + return 0; /* success */ | |
3985 | + | |
3986 | + /* revert */ | |
3987 | + au_set_h_dptr(dentry, bdst, NULL); | |
3988 | + au_set_dbstart(dentry, bsrc); | |
3989 | + } | |
3990 | + | |
3991 | + return err; | |
3992 | +} | |
3993 | + | |
3994 | +struct au_cpup_simple_args { | |
3995 | + int *errp; | |
3996 | + struct dentry *dentry; | |
3997 | + aufs_bindex_t bdst; | |
3998 | + loff_t len; | |
3999 | + unsigned int flags; | |
4000 | +}; | |
4001 | + | |
4002 | +static void au_call_cpup_simple(void *args) | |
4003 | +{ | |
4004 | + struct au_cpup_simple_args *a = args; | |
4005 | + *a->errp = au_cpup_simple(a->dentry, a->bdst, a->len, a->flags); | |
4006 | +} | |
4007 | + | |
4008 | +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
4009 | + unsigned int flags) | |
4010 | +{ | |
4011 | + int err, wkq_err; | |
1facf9fc | 4012 | + struct dentry *parent; |
4013 | + struct inode *h_dir; | |
4014 | + | |
4015 | + parent = dget_parent(dentry); | |
4016 | + h_dir = au_h_iptr(parent->d_inode, bdst); | |
53392da6 AM |
4017 | + if (!au_test_h_perm_sio(h_dir, MAY_EXEC | MAY_WRITE) |
4018 | + && !au_cpup_sio_test(dentry->d_sb, dentry->d_inode->i_mode)) | |
1facf9fc | 4019 | + err = au_cpup_simple(dentry, bdst, len, flags); |
4020 | + else { | |
4021 | + struct au_cpup_simple_args args = { | |
4022 | + .errp = &err, | |
4023 | + .dentry = dentry, | |
4024 | + .bdst = bdst, | |
4025 | + .len = len, | |
4026 | + .flags = flags | |
4027 | + }; | |
4028 | + wkq_err = au_wkq_wait(au_call_cpup_simple, &args); | |
4029 | + if (unlikely(wkq_err)) | |
4030 | + err = wkq_err; | |
4031 | + } | |
4032 | + | |
4033 | + dput(parent); | |
4034 | + return err; | |
4035 | +} | |
4036 | + | |
4037 | +/* ---------------------------------------------------------------------- */ | |
4038 | + | |
4039 | +/* | |
4040 | + * copyup the deleted file for writing. | |
4041 | + */ | |
4042 | +static int au_do_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, | |
4043 | + struct dentry *wh_dentry, struct file *file, | |
4044 | + loff_t len) | |
4045 | +{ | |
4046 | + int err; | |
4047 | + aufs_bindex_t bstart; | |
4048 | + struct au_dinfo *dinfo; | |
4049 | + struct dentry *h_d_dst, *h_d_start; | |
4a4d8108 | 4050 | + struct au_hdentry *hdp; |
1facf9fc | 4051 | + |
4052 | + dinfo = au_di(dentry); | |
1308ab2a | 4053 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
4054 | + | |
1facf9fc | 4055 | + bstart = dinfo->di_bstart; |
4a4d8108 AM |
4056 | + hdp = dinfo->di_hdentry; |
4057 | + h_d_dst = hdp[0 + bdst].hd_dentry; | |
1facf9fc | 4058 | + dinfo->di_bstart = bdst; |
4a4d8108 | 4059 | + hdp[0 + bdst].hd_dentry = wh_dentry; |
027c5e7a AM |
4060 | + if (file) { |
4061 | + h_d_start = hdp[0 + bstart].hd_dentry; | |
4a4d8108 | 4062 | + hdp[0 + bstart].hd_dentry = au_hf_top(file)->f_dentry; |
027c5e7a | 4063 | + } |
1facf9fc | 4064 | + err = au_cpup_single(dentry, bdst, bstart, len, !AuCpup_DTIME, |
4065 | + /*h_parent*/NULL); | |
027c5e7a AM |
4066 | + if (file) { |
4067 | + if (!err) | |
4068 | + err = au_reopen_nondir(file); | |
4a4d8108 | 4069 | + hdp[0 + bstart].hd_dentry = h_d_start; |
1facf9fc | 4070 | + } |
4a4d8108 | 4071 | + hdp[0 + bdst].hd_dentry = h_d_dst; |
1facf9fc | 4072 | + dinfo->di_bstart = bstart; |
4073 | + | |
4074 | + return err; | |
4075 | +} | |
4076 | + | |
4077 | +static int au_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
4078 | + struct file *file) | |
4079 | +{ | |
4080 | + int err; | |
4081 | + struct au_dtime dt; | |
4082 | + struct dentry *parent, *h_parent, *wh_dentry; | |
4083 | + struct au_branch *br; | |
4084 | + struct path h_path; | |
4085 | + | |
4086 | + br = au_sbr(dentry->d_sb, bdst); | |
4087 | + parent = dget_parent(dentry); | |
4088 | + h_parent = au_h_dptr(parent, bdst); | |
4089 | + wh_dentry = au_whtmp_lkup(h_parent, br, &dentry->d_name); | |
4090 | + err = PTR_ERR(wh_dentry); | |
4091 | + if (IS_ERR(wh_dentry)) | |
4092 | + goto out; | |
4093 | + | |
4094 | + h_path.dentry = h_parent; | |
4095 | + h_path.mnt = br->br_mnt; | |
4096 | + au_dtime_store(&dt, parent, &h_path); | |
4097 | + err = au_do_cpup_wh(dentry, bdst, wh_dentry, file, len); | |
4098 | + if (unlikely(err)) | |
4099 | + goto out_wh; | |
4100 | + | |
4101 | + dget(wh_dentry); | |
4102 | + h_path.dentry = wh_dentry; | |
4a4d8108 AM |
4103 | + if (!S_ISDIR(wh_dentry->d_inode->i_mode)) |
4104 | + err = vfsub_unlink(h_parent->d_inode, &h_path, /*force*/0); | |
4105 | + else | |
4106 | + err = vfsub_rmdir(h_parent->d_inode, &h_path); | |
1facf9fc | 4107 | + if (unlikely(err)) { |
4108 | + AuIOErr("failed remove copied-up tmp file %.*s(%d)\n", | |
4109 | + AuDLNPair(wh_dentry), err); | |
4110 | + err = -EIO; | |
4111 | + } | |
4112 | + au_dtime_revert(&dt); | |
4113 | + au_set_hi_wh(dentry->d_inode, bdst, wh_dentry); | |
4114 | + | |
4f0767ce | 4115 | +out_wh: |
1facf9fc | 4116 | + dput(wh_dentry); |
4f0767ce | 4117 | +out: |
1facf9fc | 4118 | + dput(parent); |
4119 | + return err; | |
4120 | +} | |
4121 | + | |
4122 | +struct au_cpup_wh_args { | |
4123 | + int *errp; | |
4124 | + struct dentry *dentry; | |
4125 | + aufs_bindex_t bdst; | |
4126 | + loff_t len; | |
4127 | + struct file *file; | |
4128 | +}; | |
4129 | + | |
4130 | +static void au_call_cpup_wh(void *args) | |
4131 | +{ | |
4132 | + struct au_cpup_wh_args *a = args; | |
4133 | + *a->errp = au_cpup_wh(a->dentry, a->bdst, a->len, a->file); | |
4134 | +} | |
4135 | + | |
4136 | +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
4137 | + struct file *file) | |
4138 | +{ | |
4139 | + int err, wkq_err; | |
4140 | + struct dentry *parent, *h_orph, *h_parent, *h_dentry; | |
4141 | + struct inode *dir, *h_dir, *h_tmpdir, *h_inode; | |
4142 | + struct au_wbr *wbr; | |
4143 | + | |
4144 | + parent = dget_parent(dentry); | |
4145 | + dir = parent->d_inode; | |
4146 | + h_orph = NULL; | |
4147 | + h_parent = NULL; | |
4148 | + h_dir = au_igrab(au_h_iptr(dir, bdst)); | |
4149 | + h_tmpdir = h_dir; | |
4150 | + if (!h_dir->i_nlink) { | |
4151 | + wbr = au_sbr(dentry->d_sb, bdst)->br_wbr; | |
4152 | + h_orph = wbr->wbr_orph; | |
4153 | + | |
4154 | + h_parent = dget(au_h_dptr(parent, bdst)); | |
1facf9fc | 4155 | + au_set_h_dptr(parent, bdst, dget(h_orph)); |
4156 | + h_tmpdir = h_orph->d_inode; | |
1facf9fc | 4157 | + au_set_h_iptr(dir, bdst, au_igrab(h_tmpdir), /*flags*/0); |
4158 | + | |
4159 | + /* this temporary unlock is safe */ | |
4160 | + if (file) | |
4a4d8108 | 4161 | + h_dentry = au_hf_top(file)->f_dentry; |
1facf9fc | 4162 | + else |
4163 | + h_dentry = au_h_dptr(dentry, au_dbstart(dentry)); | |
4164 | + h_inode = h_dentry->d_inode; | |
4165 | + IMustLock(h_inode); | |
4166 | + mutex_unlock(&h_inode->i_mutex); | |
dece6358 | 4167 | + mutex_lock_nested(&h_tmpdir->i_mutex, AuLsc_I_PARENT3); |
1facf9fc | 4168 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); |
4a4d8108 | 4169 | + /* todo: au_h_open_pre()? */ |
1facf9fc | 4170 | + } |
4171 | + | |
53392da6 AM |
4172 | + if (!au_test_h_perm_sio(h_tmpdir, MAY_EXEC | MAY_WRITE) |
4173 | + && !au_cpup_sio_test(dentry->d_sb, dentry->d_inode->i_mode)) | |
1facf9fc | 4174 | + err = au_cpup_wh(dentry, bdst, len, file); |
4175 | + else { | |
4176 | + struct au_cpup_wh_args args = { | |
4177 | + .errp = &err, | |
4178 | + .dentry = dentry, | |
4179 | + .bdst = bdst, | |
4180 | + .len = len, | |
4181 | + .file = file | |
4182 | + }; | |
4183 | + wkq_err = au_wkq_wait(au_call_cpup_wh, &args); | |
4184 | + if (unlikely(wkq_err)) | |
4185 | + err = wkq_err; | |
4186 | + } | |
4187 | + | |
4188 | + if (h_orph) { | |
4189 | + mutex_unlock(&h_tmpdir->i_mutex); | |
4a4d8108 | 4190 | + /* todo: au_h_open_post()? */ |
1facf9fc | 4191 | + au_set_h_iptr(dir, bdst, au_igrab(h_dir), /*flags*/0); |
1facf9fc | 4192 | + au_set_h_dptr(parent, bdst, h_parent); |
4193 | + } | |
4194 | + iput(h_dir); | |
4195 | + dput(parent); | |
4196 | + | |
4197 | + return err; | |
4198 | +} | |
4199 | + | |
4200 | +/* ---------------------------------------------------------------------- */ | |
4201 | + | |
4202 | +/* | |
4203 | + * generic routine for both of copy-up and copy-down. | |
4204 | + */ | |
4205 | +/* cf. revalidate function in file.c */ | |
4206 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
4207 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
4208 | + struct dentry *h_parent, void *arg), | |
4209 | + void *arg) | |
4210 | +{ | |
4211 | + int err; | |
4212 | + struct au_pin pin; | |
4213 | + struct dentry *d, *parent, *h_parent, *real_parent; | |
4214 | + | |
4215 | + err = 0; | |
4216 | + parent = dget_parent(dentry); | |
4217 | + if (IS_ROOT(parent)) | |
4218 | + goto out; | |
4219 | + | |
4220 | + au_pin_init(&pin, dentry, bdst, AuLsc_DI_PARENT2, AuLsc_I_PARENT2, | |
4221 | + au_opt_udba(dentry->d_sb), AuPin_MNT_WRITE); | |
4222 | + | |
4223 | + /* do not use au_dpage */ | |
4224 | + real_parent = parent; | |
4225 | + while (1) { | |
4226 | + dput(parent); | |
4227 | + parent = dget_parent(dentry); | |
4228 | + h_parent = au_h_dptr(parent, bdst); | |
4229 | + if (h_parent) | |
4230 | + goto out; /* success */ | |
4231 | + | |
4232 | + /* find top dir which is necessary to cpup */ | |
4233 | + do { | |
4234 | + d = parent; | |
4235 | + dput(parent); | |
4236 | + parent = dget_parent(d); | |
4237 | + di_read_lock_parent3(parent, !AuLock_IR); | |
4238 | + h_parent = au_h_dptr(parent, bdst); | |
4239 | + di_read_unlock(parent, !AuLock_IR); | |
4240 | + } while (!h_parent); | |
4241 | + | |
4242 | + if (d != real_parent) | |
4243 | + di_write_lock_child3(d); | |
4244 | + | |
4245 | + /* somebody else might create while we were sleeping */ | |
4246 | + if (!au_h_dptr(d, bdst) || !au_h_dptr(d, bdst)->d_inode) { | |
4247 | + if (au_h_dptr(d, bdst)) | |
4248 | + au_update_dbstart(d); | |
4249 | + | |
4250 | + au_pin_set_dentry(&pin, d); | |
4251 | + err = au_do_pin(&pin); | |
4252 | + if (!err) { | |
4253 | + err = cp(d, bdst, h_parent, arg); | |
4254 | + au_unpin(&pin); | |
4255 | + } | |
4256 | + } | |
4257 | + | |
4258 | + if (d != real_parent) | |
4259 | + di_write_unlock(d); | |
4260 | + if (unlikely(err)) | |
4261 | + break; | |
4262 | + } | |
4263 | + | |
4f0767ce | 4264 | +out: |
1facf9fc | 4265 | + dput(parent); |
4266 | + return err; | |
4267 | +} | |
4268 | + | |
4269 | +static int au_cpup_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
4270 | + struct dentry *h_parent __maybe_unused , | |
4271 | + void *arg __maybe_unused) | |
4272 | +{ | |
4273 | + return au_sio_cpup_simple(dentry, bdst, -1, AuCpup_DTIME); | |
4274 | +} | |
4275 | + | |
4276 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
4277 | +{ | |
4278 | + return au_cp_dirs(dentry, bdst, au_cpup_dir, NULL); | |
4279 | +} | |
4280 | + | |
4281 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
4282 | +{ | |
4283 | + int err; | |
4284 | + struct dentry *parent; | |
4285 | + struct inode *dir; | |
4286 | + | |
4287 | + parent = dget_parent(dentry); | |
4288 | + dir = parent->d_inode; | |
4289 | + err = 0; | |
4290 | + if (au_h_iptr(dir, bdst)) | |
4291 | + goto out; | |
4292 | + | |
4293 | + di_read_unlock(parent, AuLock_IR); | |
4294 | + di_write_lock_parent(parent); | |
4295 | + /* someone else might change our inode while we were sleeping */ | |
4296 | + if (!au_h_iptr(dir, bdst)) | |
4297 | + err = au_cpup_dirs(dentry, bdst); | |
4298 | + di_downgrade_lock(parent, AuLock_IR); | |
4299 | + | |
4f0767ce | 4300 | +out: |
1facf9fc | 4301 | + dput(parent); |
4302 | + return err; | |
4303 | +} | |
7f207e10 AM |
4304 | diff -urN /usr/share/empty/fs/aufs/cpup.h linux/fs/aufs/cpup.h |
4305 | --- /usr/share/empty/fs/aufs/cpup.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 4306 | +++ linux/fs/aufs/cpup.h 2011-08-24 13:30:24.731313534 +0200 |
7f207e10 | 4307 | @@ -0,0 +1,83 @@ |
1facf9fc | 4308 | +/* |
027c5e7a | 4309 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 4310 | + * |
4311 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4312 | + * it under the terms of the GNU General Public License as published by | |
4313 | + * the Free Software Foundation; either version 2 of the License, or | |
4314 | + * (at your option) any later version. | |
dece6358 AM |
4315 | + * |
4316 | + * This program is distributed in the hope that it will be useful, | |
4317 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4318 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4319 | + * GNU General Public License for more details. | |
4320 | + * | |
4321 | + * You should have received a copy of the GNU General Public License | |
4322 | + * along with this program; if not, write to the Free Software | |
4323 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4324 | + */ |
4325 | + | |
4326 | +/* | |
4327 | + * copy-up/down functions | |
4328 | + */ | |
4329 | + | |
4330 | +#ifndef __AUFS_CPUP_H__ | |
4331 | +#define __AUFS_CPUP_H__ | |
4332 | + | |
4333 | +#ifdef __KERNEL__ | |
4334 | + | |
dece6358 AM |
4335 | +#include <linux/path.h> |
4336 | +#include <linux/time.h> | |
1facf9fc | 4337 | +#include <linux/aufs_type.h> |
4338 | + | |
dece6358 AM |
4339 | +struct inode; |
4340 | +struct file; | |
4341 | + | |
1facf9fc | 4342 | +void au_cpup_attr_flags(struct inode *dst, struct inode *src); |
4343 | +void au_cpup_attr_timesizes(struct inode *inode); | |
4344 | +void au_cpup_attr_nlink(struct inode *inode, int force); | |
4345 | +void au_cpup_attr_changeable(struct inode *inode); | |
4346 | +void au_cpup_igen(struct inode *inode, struct inode *h_inode); | |
4347 | +void au_cpup_attr_all(struct inode *inode, int force); | |
4348 | + | |
4349 | +/* ---------------------------------------------------------------------- */ | |
4350 | + | |
4351 | +/* cpup flags */ | |
4352 | +#define AuCpup_DTIME 1 /* do dtime_store/revert */ | |
4353 | +#define AuCpup_KEEPLINO (1 << 1) /* do not clear the lower xino, | |
4354 | + for link(2) */ | |
4355 | +#define au_ftest_cpup(flags, name) ((flags) & AuCpup_##name) | |
7f207e10 AM |
4356 | +#define au_fset_cpup(flags, name) \ |
4357 | + do { (flags) |= AuCpup_##name; } while (0) | |
4358 | +#define au_fclr_cpup(flags, name) \ | |
4359 | + do { (flags) &= ~AuCpup_##name; } while (0) | |
1facf9fc | 4360 | + |
4361 | +int au_copy_file(struct file *dst, struct file *src, loff_t len); | |
4362 | +int au_sio_cpup_single(struct dentry *dentry, aufs_bindex_t bdst, | |
4363 | + aufs_bindex_t bsrc, loff_t len, unsigned int flags, | |
4364 | + struct dentry *dst_parent); | |
4365 | +int au_sio_cpup_simple(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
4366 | + unsigned int flags); | |
4367 | +int au_sio_cpup_wh(struct dentry *dentry, aufs_bindex_t bdst, loff_t len, | |
4368 | + struct file *file); | |
4369 | + | |
4370 | +int au_cp_dirs(struct dentry *dentry, aufs_bindex_t bdst, | |
4371 | + int (*cp)(struct dentry *dentry, aufs_bindex_t bdst, | |
4372 | + struct dentry *h_parent, void *arg), | |
4373 | + void *arg); | |
4374 | +int au_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
4375 | +int au_test_and_cpup_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
4376 | + | |
4377 | +/* ---------------------------------------------------------------------- */ | |
4378 | + | |
4379 | +/* keep timestamps when copyup */ | |
4380 | +struct au_dtime { | |
4381 | + struct dentry *dt_dentry; | |
4382 | + struct path dt_h_path; | |
4383 | + struct timespec dt_atime, dt_mtime; | |
4384 | +}; | |
4385 | +void au_dtime_store(struct au_dtime *dt, struct dentry *dentry, | |
4386 | + struct path *h_path); | |
4387 | +void au_dtime_revert(struct au_dtime *dt); | |
4388 | + | |
4389 | +#endif /* __KERNEL__ */ | |
4390 | +#endif /* __AUFS_CPUP_H__ */ | |
7f207e10 AM |
4391 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.c linux/fs/aufs/dbgaufs.c |
4392 | --- /usr/share/empty/fs/aufs/dbgaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 4393 | +++ linux/fs/aufs/dbgaufs.c 2011-08-24 13:30:24.731313534 +0200 |
4a4d8108 | 4394 | @@ -0,0 +1,334 @@ |
1facf9fc | 4395 | +/* |
027c5e7a | 4396 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 4397 | + * |
4398 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4399 | + * it under the terms of the GNU General Public License as published by | |
4400 | + * the Free Software Foundation; either version 2 of the License, or | |
4401 | + * (at your option) any later version. | |
dece6358 AM |
4402 | + * |
4403 | + * This program is distributed in the hope that it will be useful, | |
4404 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4405 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4406 | + * GNU General Public License for more details. | |
4407 | + * | |
4408 | + * You should have received a copy of the GNU General Public License | |
4409 | + * along with this program; if not, write to the Free Software | |
4410 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4411 | + */ |
4412 | + | |
4413 | +/* | |
4414 | + * debugfs interface | |
4415 | + */ | |
4416 | + | |
4417 | +#include <linux/debugfs.h> | |
4418 | +#include "aufs.h" | |
4419 | + | |
4420 | +#ifndef CONFIG_SYSFS | |
4421 | +#error DEBUG_FS depends upon SYSFS | |
4422 | +#endif | |
4423 | + | |
4424 | +static struct dentry *dbgaufs; | |
4425 | +static const mode_t dbgaufs_mode = S_IRUSR | S_IRGRP | S_IROTH; | |
4426 | + | |
4427 | +/* 20 is max digits length of ulong 64 */ | |
4428 | +struct dbgaufs_arg { | |
4429 | + int n; | |
4430 | + char a[20 * 4]; | |
4431 | +}; | |
4432 | + | |
4433 | +/* | |
4434 | + * common function for all XINO files | |
4435 | + */ | |
4436 | +static int dbgaufs_xi_release(struct inode *inode __maybe_unused, | |
4437 | + struct file *file) | |
4438 | +{ | |
4439 | + kfree(file->private_data); | |
4440 | + return 0; | |
4441 | +} | |
4442 | + | |
4443 | +static int dbgaufs_xi_open(struct file *xf, struct file *file, int do_fcnt) | |
4444 | +{ | |
4445 | + int err; | |
4446 | + struct kstat st; | |
4447 | + struct dbgaufs_arg *p; | |
4448 | + | |
4449 | + err = -ENOMEM; | |
4450 | + p = kmalloc(sizeof(*p), GFP_NOFS); | |
4451 | + if (unlikely(!p)) | |
4452 | + goto out; | |
4453 | + | |
4454 | + err = 0; | |
4455 | + p->n = 0; | |
4456 | + file->private_data = p; | |
4457 | + if (!xf) | |
4458 | + goto out; | |
4459 | + | |
4460 | + err = vfs_getattr(xf->f_vfsmnt, xf->f_dentry, &st); | |
4461 | + if (!err) { | |
4462 | + if (do_fcnt) | |
4463 | + p->n = snprintf | |
4464 | + (p->a, sizeof(p->a), "%ld, %llux%lu %lld\n", | |
4465 | + (long)file_count(xf), st.blocks, st.blksize, | |
4466 | + (long long)st.size); | |
4467 | + else | |
4468 | + p->n = snprintf(p->a, sizeof(p->a), "%llux%lu %lld\n", | |
4469 | + st.blocks, st.blksize, | |
4470 | + (long long)st.size); | |
4471 | + AuDebugOn(p->n >= sizeof(p->a)); | |
4472 | + } else { | |
4473 | + p->n = snprintf(p->a, sizeof(p->a), "err %d\n", err); | |
4474 | + err = 0; | |
4475 | + } | |
4476 | + | |
4f0767ce | 4477 | +out: |
1facf9fc | 4478 | + return err; |
4479 | + | |
4480 | +} | |
4481 | + | |
4482 | +static ssize_t dbgaufs_xi_read(struct file *file, char __user *buf, | |
4483 | + size_t count, loff_t *ppos) | |
4484 | +{ | |
4485 | + struct dbgaufs_arg *p; | |
4486 | + | |
4487 | + p = file->private_data; | |
4488 | + return simple_read_from_buffer(buf, count, ppos, p->a, p->n); | |
4489 | +} | |
4490 | + | |
4491 | +/* ---------------------------------------------------------------------- */ | |
4492 | + | |
4493 | +static int dbgaufs_xib_open(struct inode *inode, struct file *file) | |
4494 | +{ | |
4495 | + int err; | |
4496 | + struct au_sbinfo *sbinfo; | |
4497 | + struct super_block *sb; | |
4498 | + | |
4499 | + sbinfo = inode->i_private; | |
4500 | + sb = sbinfo->si_sb; | |
4501 | + si_noflush_read_lock(sb); | |
4502 | + err = dbgaufs_xi_open(sbinfo->si_xib, file, /*do_fcnt*/0); | |
4503 | + si_read_unlock(sb); | |
4504 | + return err; | |
4505 | +} | |
4506 | + | |
4507 | +static const struct file_operations dbgaufs_xib_fop = { | |
4a4d8108 | 4508 | + .owner = THIS_MODULE, |
1facf9fc | 4509 | + .open = dbgaufs_xib_open, |
4510 | + .release = dbgaufs_xi_release, | |
4511 | + .read = dbgaufs_xi_read | |
4512 | +}; | |
4513 | + | |
4514 | +/* ---------------------------------------------------------------------- */ | |
4515 | + | |
4516 | +#define DbgaufsXi_PREFIX "xi" | |
4517 | + | |
4518 | +static int dbgaufs_xino_open(struct inode *inode, struct file *file) | |
4519 | +{ | |
4520 | + int err; | |
4521 | + long l; | |
4522 | + struct au_sbinfo *sbinfo; | |
4523 | + struct super_block *sb; | |
4524 | + struct file *xf; | |
4525 | + struct qstr *name; | |
4526 | + | |
4527 | + err = -ENOENT; | |
4528 | + xf = NULL; | |
4529 | + name = &file->f_dentry->d_name; | |
4530 | + if (unlikely(name->len < sizeof(DbgaufsXi_PREFIX) | |
4531 | + || memcmp(name->name, DbgaufsXi_PREFIX, | |
4532 | + sizeof(DbgaufsXi_PREFIX) - 1))) | |
4533 | + goto out; | |
4534 | + err = strict_strtol(name->name + sizeof(DbgaufsXi_PREFIX) - 1, 10, &l); | |
4535 | + if (unlikely(err)) | |
4536 | + goto out; | |
4537 | + | |
4538 | + sbinfo = inode->i_private; | |
4539 | + sb = sbinfo->si_sb; | |
4540 | + si_noflush_read_lock(sb); | |
4541 | + if (l <= au_sbend(sb)) { | |
4542 | + xf = au_sbr(sb, (aufs_bindex_t)l)->br_xino.xi_file; | |
4543 | + err = dbgaufs_xi_open(xf, file, /*do_fcnt*/1); | |
4544 | + } else | |
4545 | + err = -ENOENT; | |
4546 | + si_read_unlock(sb); | |
4547 | + | |
4f0767ce | 4548 | +out: |
1facf9fc | 4549 | + return err; |
4550 | +} | |
4551 | + | |
4552 | +static const struct file_operations dbgaufs_xino_fop = { | |
4a4d8108 | 4553 | + .owner = THIS_MODULE, |
1facf9fc | 4554 | + .open = dbgaufs_xino_open, |
4555 | + .release = dbgaufs_xi_release, | |
4556 | + .read = dbgaufs_xi_read | |
4557 | +}; | |
4558 | + | |
4559 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
4560 | +{ | |
4561 | + aufs_bindex_t bend; | |
4562 | + struct au_branch *br; | |
4563 | + struct au_xino_file *xi; | |
4564 | + | |
4565 | + if (!au_sbi(sb)->si_dbgaufs) | |
4566 | + return; | |
4567 | + | |
4568 | + bend = au_sbend(sb); | |
4569 | + for (; bindex <= bend; bindex++) { | |
4570 | + br = au_sbr(sb, bindex); | |
4571 | + xi = &br->br_xino; | |
4572 | + if (xi->xi_dbgaufs) { | |
4573 | + debugfs_remove(xi->xi_dbgaufs); | |
4574 | + xi->xi_dbgaufs = NULL; | |
4575 | + } | |
4576 | + } | |
4577 | +} | |
4578 | + | |
4579 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
4580 | +{ | |
4581 | + struct au_sbinfo *sbinfo; | |
4582 | + struct dentry *parent; | |
4583 | + struct au_branch *br; | |
4584 | + struct au_xino_file *xi; | |
4585 | + aufs_bindex_t bend; | |
4586 | + char name[sizeof(DbgaufsXi_PREFIX) + 5]; /* "xi" bindex NULL */ | |
4587 | + | |
4588 | + sbinfo = au_sbi(sb); | |
4589 | + parent = sbinfo->si_dbgaufs; | |
4590 | + if (!parent) | |
4591 | + return; | |
4592 | + | |
4593 | + bend = au_sbend(sb); | |
4594 | + for (; bindex <= bend; bindex++) { | |
4595 | + snprintf(name, sizeof(name), DbgaufsXi_PREFIX "%d", bindex); | |
4596 | + br = au_sbr(sb, bindex); | |
4597 | + xi = &br->br_xino; | |
4598 | + AuDebugOn(xi->xi_dbgaufs); | |
4599 | + xi->xi_dbgaufs = debugfs_create_file(name, dbgaufs_mode, parent, | |
4600 | + sbinfo, &dbgaufs_xino_fop); | |
4601 | + /* ignore an error */ | |
4602 | + if (unlikely(!xi->xi_dbgaufs)) | |
4603 | + AuWarn1("failed %s under debugfs\n", name); | |
4604 | + } | |
4605 | +} | |
4606 | + | |
4607 | +/* ---------------------------------------------------------------------- */ | |
4608 | + | |
4609 | +#ifdef CONFIG_AUFS_EXPORT | |
4610 | +static int dbgaufs_xigen_open(struct inode *inode, struct file *file) | |
4611 | +{ | |
4612 | + int err; | |
4613 | + struct au_sbinfo *sbinfo; | |
4614 | + struct super_block *sb; | |
4615 | + | |
4616 | + sbinfo = inode->i_private; | |
4617 | + sb = sbinfo->si_sb; | |
4618 | + si_noflush_read_lock(sb); | |
4619 | + err = dbgaufs_xi_open(sbinfo->si_xigen, file, /*do_fcnt*/0); | |
4620 | + si_read_unlock(sb); | |
4621 | + return err; | |
4622 | +} | |
4623 | + | |
4624 | +static const struct file_operations dbgaufs_xigen_fop = { | |
4a4d8108 | 4625 | + .owner = THIS_MODULE, |
1facf9fc | 4626 | + .open = dbgaufs_xigen_open, |
4627 | + .release = dbgaufs_xi_release, | |
4628 | + .read = dbgaufs_xi_read | |
4629 | +}; | |
4630 | + | |
4631 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
4632 | +{ | |
4633 | + int err; | |
4634 | + | |
dece6358 AM |
4635 | + /* |
4636 | + * This function is a dynamic '__init' fucntion actually, | |
4637 | + * so the tiny check for si_rwsem is unnecessary. | |
4638 | + */ | |
4639 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
4640 | + | |
1facf9fc | 4641 | + err = -EIO; |
4642 | + sbinfo->si_dbgaufs_xigen = debugfs_create_file | |
4643 | + ("xigen", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
4644 | + &dbgaufs_xigen_fop); | |
4645 | + if (sbinfo->si_dbgaufs_xigen) | |
4646 | + err = 0; | |
4647 | + | |
4648 | + return err; | |
4649 | +} | |
4650 | +#else | |
4651 | +static int dbgaufs_xigen_init(struct au_sbinfo *sbinfo) | |
4652 | +{ | |
4653 | + return 0; | |
4654 | +} | |
4655 | +#endif /* CONFIG_AUFS_EXPORT */ | |
4656 | + | |
4657 | +/* ---------------------------------------------------------------------- */ | |
4658 | + | |
4659 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo) | |
4660 | +{ | |
dece6358 AM |
4661 | + /* |
4662 | + * This function is a dynamic '__init' fucntion actually, | |
4663 | + * so the tiny check for si_rwsem is unnecessary. | |
4664 | + */ | |
4665 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
4666 | + | |
1facf9fc | 4667 | + debugfs_remove_recursive(sbinfo->si_dbgaufs); |
4668 | + sbinfo->si_dbgaufs = NULL; | |
4669 | + kobject_put(&sbinfo->si_kobj); | |
4670 | +} | |
4671 | + | |
4672 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo) | |
4673 | +{ | |
4674 | + int err; | |
4675 | + char name[SysaufsSiNameLen]; | |
4676 | + | |
dece6358 AM |
4677 | + /* |
4678 | + * This function is a dynamic '__init' fucntion actually, | |
4679 | + * so the tiny check for si_rwsem is unnecessary. | |
4680 | + */ | |
4681 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
4682 | + | |
1facf9fc | 4683 | + err = -ENOENT; |
4684 | + if (!dbgaufs) { | |
4685 | + AuErr1("/debug/aufs is uninitialized\n"); | |
4686 | + goto out; | |
4687 | + } | |
4688 | + | |
4689 | + err = -EIO; | |
4690 | + sysaufs_name(sbinfo, name); | |
4691 | + sbinfo->si_dbgaufs = debugfs_create_dir(name, dbgaufs); | |
4692 | + if (unlikely(!sbinfo->si_dbgaufs)) | |
4693 | + goto out; | |
4694 | + kobject_get(&sbinfo->si_kobj); | |
4695 | + | |
4696 | + sbinfo->si_dbgaufs_xib = debugfs_create_file | |
4697 | + ("xib", dbgaufs_mode, sbinfo->si_dbgaufs, sbinfo, | |
4698 | + &dbgaufs_xib_fop); | |
4699 | + if (unlikely(!sbinfo->si_dbgaufs_xib)) | |
4700 | + goto out_dir; | |
4701 | + | |
4702 | + err = dbgaufs_xigen_init(sbinfo); | |
4703 | + if (!err) | |
4704 | + goto out; /* success */ | |
4705 | + | |
4f0767ce | 4706 | +out_dir: |
1facf9fc | 4707 | + dbgaufs_si_fin(sbinfo); |
4f0767ce | 4708 | +out: |
1facf9fc | 4709 | + return err; |
4710 | +} | |
4711 | + | |
4712 | +/* ---------------------------------------------------------------------- */ | |
4713 | + | |
4714 | +void dbgaufs_fin(void) | |
4715 | +{ | |
4716 | + debugfs_remove(dbgaufs); | |
4717 | +} | |
4718 | + | |
4719 | +int __init dbgaufs_init(void) | |
4720 | +{ | |
4721 | + int err; | |
4722 | + | |
4723 | + err = -EIO; | |
4724 | + dbgaufs = debugfs_create_dir(AUFS_NAME, NULL); | |
4725 | + if (dbgaufs) | |
4726 | + err = 0; | |
4727 | + return err; | |
4728 | +} | |
7f207e10 AM |
4729 | diff -urN /usr/share/empty/fs/aufs/dbgaufs.h linux/fs/aufs/dbgaufs.h |
4730 | --- /usr/share/empty/fs/aufs/dbgaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 4731 | +++ linux/fs/aufs/dbgaufs.h 2011-08-24 13:30:24.731313534 +0200 |
4a4d8108 | 4732 | @@ -0,0 +1,52 @@ |
1facf9fc | 4733 | +/* |
027c5e7a | 4734 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 4735 | + * |
4736 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4737 | + * it under the terms of the GNU General Public License as published by | |
4738 | + * the Free Software Foundation; either version 2 of the License, or | |
4739 | + * (at your option) any later version. | |
dece6358 AM |
4740 | + * |
4741 | + * This program is distributed in the hope that it will be useful, | |
4742 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4743 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4744 | + * GNU General Public License for more details. | |
4745 | + * | |
4746 | + * You should have received a copy of the GNU General Public License | |
4747 | + * along with this program; if not, write to the Free Software | |
4748 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4749 | + */ |
4750 | + | |
4751 | +/* | |
4752 | + * debugfs interface | |
4753 | + */ | |
4754 | + | |
4755 | +#ifndef __DBGAUFS_H__ | |
4756 | +#define __DBGAUFS_H__ | |
4757 | + | |
4758 | +#ifdef __KERNEL__ | |
4759 | + | |
dece6358 | 4760 | +#include <linux/init.h> |
1facf9fc | 4761 | +#include <linux/aufs_type.h> |
4762 | + | |
dece6358 | 4763 | +struct super_block; |
1facf9fc | 4764 | +struct au_sbinfo; |
dece6358 | 4765 | + |
1facf9fc | 4766 | +#ifdef CONFIG_DEBUG_FS |
4767 | +/* dbgaufs.c */ | |
4768 | +void dbgaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
4769 | +void dbgaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
4770 | +void dbgaufs_si_fin(struct au_sbinfo *sbinfo); | |
4771 | +int dbgaufs_si_init(struct au_sbinfo *sbinfo); | |
4772 | +void dbgaufs_fin(void); | |
4773 | +int __init dbgaufs_init(void); | |
1facf9fc | 4774 | +#else |
4a4d8108 AM |
4775 | +AuStubVoid(dbgaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) |
4776 | +AuStubVoid(dbgaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
4777 | +AuStubVoid(dbgaufs_si_fin, struct au_sbinfo *sbinfo) | |
4778 | +AuStubInt0(dbgaufs_si_init, struct au_sbinfo *sbinfo) | |
4779 | +AuStubVoid(dbgaufs_fin, void) | |
4780 | +AuStubInt0(__init dbgaufs_init, void) | |
1facf9fc | 4781 | +#endif /* CONFIG_DEBUG_FS */ |
4782 | + | |
4783 | +#endif /* __KERNEL__ */ | |
4784 | +#endif /* __DBGAUFS_H__ */ | |
7f207e10 AM |
4785 | diff -urN /usr/share/empty/fs/aufs/dcsub.c linux/fs/aufs/dcsub.c |
4786 | --- /usr/share/empty/fs/aufs/dcsub.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 4787 | +++ linux/fs/aufs/dcsub.c 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 4788 | @@ -0,0 +1,243 @@ |
1facf9fc | 4789 | +/* |
027c5e7a | 4790 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 4791 | + * |
4792 | + * This program, aufs is free software; you can redistribute it and/or modify | |
4793 | + * it under the terms of the GNU General Public License as published by | |
4794 | + * the Free Software Foundation; either version 2 of the License, or | |
4795 | + * (at your option) any later version. | |
dece6358 AM |
4796 | + * |
4797 | + * This program is distributed in the hope that it will be useful, | |
4798 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
4799 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
4800 | + * GNU General Public License for more details. | |
4801 | + * | |
4802 | + * You should have received a copy of the GNU General Public License | |
4803 | + * along with this program; if not, write to the Free Software | |
4804 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 4805 | + */ |
4806 | + | |
4807 | +/* | |
4808 | + * sub-routines for dentry cache | |
4809 | + */ | |
4810 | + | |
4811 | +#include "aufs.h" | |
4812 | + | |
4813 | +static void au_dpage_free(struct au_dpage *dpage) | |
4814 | +{ | |
4815 | + int i; | |
4816 | + struct dentry **p; | |
4817 | + | |
4818 | + p = dpage->dentries; | |
4819 | + for (i = 0; i < dpage->ndentry; i++) | |
4820 | + dput(*p++); | |
4821 | + free_page((unsigned long)dpage->dentries); | |
4822 | +} | |
4823 | + | |
4824 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp) | |
4825 | +{ | |
4826 | + int err; | |
4827 | + void *p; | |
4828 | + | |
4829 | + err = -ENOMEM; | |
4830 | + dpages->dpages = kmalloc(sizeof(*dpages->dpages), gfp); | |
4831 | + if (unlikely(!dpages->dpages)) | |
4832 | + goto out; | |
4833 | + | |
4834 | + p = (void *)__get_free_page(gfp); | |
4835 | + if (unlikely(!p)) | |
4836 | + goto out_dpages; | |
4837 | + | |
4838 | + dpages->dpages[0].ndentry = 0; | |
4839 | + dpages->dpages[0].dentries = p; | |
4840 | + dpages->ndpage = 1; | |
4841 | + return 0; /* success */ | |
4842 | + | |
4f0767ce | 4843 | +out_dpages: |
1facf9fc | 4844 | + kfree(dpages->dpages); |
4f0767ce | 4845 | +out: |
1facf9fc | 4846 | + return err; |
4847 | +} | |
4848 | + | |
4849 | +void au_dpages_free(struct au_dcsub_pages *dpages) | |
4850 | +{ | |
4851 | + int i; | |
4852 | + struct au_dpage *p; | |
4853 | + | |
4854 | + p = dpages->dpages; | |
4855 | + for (i = 0; i < dpages->ndpage; i++) | |
4856 | + au_dpage_free(p++); | |
4857 | + kfree(dpages->dpages); | |
4858 | +} | |
4859 | + | |
4860 | +static int au_dpages_append(struct au_dcsub_pages *dpages, | |
4861 | + struct dentry *dentry, gfp_t gfp) | |
4862 | +{ | |
4863 | + int err, sz; | |
4864 | + struct au_dpage *dpage; | |
4865 | + void *p; | |
4866 | + | |
4867 | + dpage = dpages->dpages + dpages->ndpage - 1; | |
4868 | + sz = PAGE_SIZE / sizeof(dentry); | |
4869 | + if (unlikely(dpage->ndentry >= sz)) { | |
4870 | + AuLabel(new dpage); | |
4871 | + err = -ENOMEM; | |
4872 | + sz = dpages->ndpage * sizeof(*dpages->dpages); | |
4873 | + p = au_kzrealloc(dpages->dpages, sz, | |
4874 | + sz + sizeof(*dpages->dpages), gfp); | |
4875 | + if (unlikely(!p)) | |
4876 | + goto out; | |
4877 | + | |
4878 | + dpages->dpages = p; | |
4879 | + dpage = dpages->dpages + dpages->ndpage; | |
4880 | + p = (void *)__get_free_page(gfp); | |
4881 | + if (unlikely(!p)) | |
4882 | + goto out; | |
4883 | + | |
4884 | + dpage->ndentry = 0; | |
4885 | + dpage->dentries = p; | |
4886 | + dpages->ndpage++; | |
4887 | + } | |
4888 | + | |
027c5e7a AM |
4889 | + AuDebugOn(!dentry->d_count); |
4890 | + dpage->dentries[dpage->ndentry++] = dget_dlock(dentry); | |
1facf9fc | 4891 | + return 0; /* success */ |
4892 | + | |
4f0767ce | 4893 | +out: |
1facf9fc | 4894 | + return err; |
4895 | +} | |
4896 | + | |
4897 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
4898 | + au_dpages_test test, void *arg) | |
4899 | +{ | |
4900 | + int err; | |
027c5e7a | 4901 | + struct dentry *this_parent; |
1facf9fc | 4902 | + struct list_head *next; |
4903 | + struct super_block *sb = root->d_sb; | |
4904 | + | |
4905 | + err = 0; | |
027c5e7a AM |
4906 | + write_seqlock(&rename_lock); |
4907 | + this_parent = root; | |
4908 | + spin_lock(&this_parent->d_lock); | |
4f0767ce | 4909 | +repeat: |
1facf9fc | 4910 | + next = this_parent->d_subdirs.next; |
4f0767ce | 4911 | +resume: |
1facf9fc | 4912 | + if (this_parent->d_sb == sb |
4913 | + && !IS_ROOT(this_parent) | |
027c5e7a AM |
4914 | + && au_di(this_parent) |
4915 | + && this_parent->d_count | |
1facf9fc | 4916 | + && (!test || test(this_parent, arg))) { |
4917 | + err = au_dpages_append(dpages, this_parent, GFP_ATOMIC); | |
4918 | + if (unlikely(err)) | |
4919 | + goto out; | |
4920 | + } | |
4921 | + | |
4922 | + while (next != &this_parent->d_subdirs) { | |
4923 | + struct list_head *tmp = next; | |
4924 | + struct dentry *dentry = list_entry(tmp, struct dentry, | |
4925 | + d_u.d_child); | |
027c5e7a | 4926 | + |
1facf9fc | 4927 | + next = tmp->next; |
027c5e7a AM |
4928 | + spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED); |
4929 | + if (dentry->d_count) { | |
4930 | + if (!list_empty(&dentry->d_subdirs)) { | |
4931 | + spin_unlock(&this_parent->d_lock); | |
4932 | + spin_release(&dentry->d_lock.dep_map, 1, | |
4933 | + _RET_IP_); | |
4934 | + this_parent = dentry; | |
4935 | + spin_acquire(&this_parent->d_lock.dep_map, 0, 1, | |
4936 | + _RET_IP_); | |
4937 | + goto repeat; | |
4938 | + } | |
4939 | + if (dentry->d_sb == sb | |
4940 | + && au_di(dentry) | |
4941 | + && (!test || test(dentry, arg))) | |
4942 | + err = au_dpages_append(dpages, dentry, | |
4943 | + GFP_ATOMIC); | |
1facf9fc | 4944 | + } |
027c5e7a AM |
4945 | + spin_unlock(&dentry->d_lock); |
4946 | + if (unlikely(err)) | |
4947 | + goto out; | |
1facf9fc | 4948 | + } |
4949 | + | |
4950 | + if (this_parent != root) { | |
027c5e7a AM |
4951 | + struct dentry *tmp; |
4952 | + struct dentry *child; | |
4953 | + | |
4954 | + tmp = this_parent->d_parent; | |
4955 | + rcu_read_lock(); | |
4956 | + spin_unlock(&this_parent->d_lock); | |
4957 | + child = this_parent; | |
4958 | + this_parent = tmp; | |
4959 | + spin_lock(&this_parent->d_lock); | |
4960 | + rcu_read_unlock(); | |
4961 | + next = child->d_u.d_child.next; | |
1facf9fc | 4962 | + goto resume; |
4963 | + } | |
027c5e7a | 4964 | + |
4f0767ce | 4965 | +out: |
027c5e7a AM |
4966 | + spin_unlock(&this_parent->d_lock); |
4967 | + write_sequnlock(&rename_lock); | |
1facf9fc | 4968 | + return err; |
4969 | +} | |
4970 | + | |
4971 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
4972 | + int do_include, au_dpages_test test, void *arg) | |
4973 | +{ | |
4974 | + int err; | |
4975 | + | |
4976 | + err = 0; | |
027c5e7a AM |
4977 | + write_seqlock(&rename_lock); |
4978 | + spin_lock(&dentry->d_lock); | |
4979 | + if (do_include | |
4980 | + && dentry->d_count | |
4981 | + && (!test || test(dentry, arg))) | |
1facf9fc | 4982 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
4983 | + spin_unlock(&dentry->d_lock); |
4984 | + if (unlikely(err)) | |
4985 | + goto out; | |
4986 | + | |
4987 | + /* | |
4988 | + * vfsmount_lock is unnecessary since this is a traverse in a single | |
4989 | + * mount | |
4990 | + */ | |
1facf9fc | 4991 | + while (!IS_ROOT(dentry)) { |
027c5e7a AM |
4992 | + dentry = dentry->d_parent; /* rename_lock is locked */ |
4993 | + spin_lock(&dentry->d_lock); | |
4994 | + if (dentry->d_count | |
4995 | + && (!test || test(dentry, arg))) | |
1facf9fc | 4996 | + err = au_dpages_append(dpages, dentry, GFP_ATOMIC); |
027c5e7a AM |
4997 | + spin_unlock(&dentry->d_lock); |
4998 | + if (unlikely(err)) | |
4999 | + break; | |
1facf9fc | 5000 | + } |
5001 | + | |
4f0767ce | 5002 | +out: |
027c5e7a | 5003 | + write_sequnlock(&rename_lock); |
1facf9fc | 5004 | + return err; |
5005 | +} | |
5006 | + | |
027c5e7a AM |
5007 | +static inline int au_dcsub_dpages_aufs(struct dentry *dentry, void *arg) |
5008 | +{ | |
5009 | + return au_di(dentry) && dentry->d_sb == arg; | |
5010 | +} | |
5011 | + | |
5012 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, | |
5013 | + struct dentry *dentry, int do_include) | |
5014 | +{ | |
5015 | + return au_dcsub_pages_rev(dpages, dentry, do_include, | |
5016 | + au_dcsub_dpages_aufs, dentry->d_sb); | |
5017 | +} | |
5018 | + | |
4a4d8108 | 5019 | +int au_test_subdir(struct dentry *d1, struct dentry *d2) |
1facf9fc | 5020 | +{ |
4a4d8108 AM |
5021 | + struct path path[2] = { |
5022 | + { | |
5023 | + .dentry = d1 | |
5024 | + }, | |
5025 | + { | |
5026 | + .dentry = d2 | |
5027 | + } | |
5028 | + }; | |
1facf9fc | 5029 | + |
4a4d8108 | 5030 | + return path_is_under(path + 0, path + 1); |
1facf9fc | 5031 | +} |
7f207e10 AM |
5032 | diff -urN /usr/share/empty/fs/aufs/dcsub.h linux/fs/aufs/dcsub.h |
5033 | --- /usr/share/empty/fs/aufs/dcsub.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 5034 | +++ linux/fs/aufs/dcsub.h 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 5035 | @@ -0,0 +1,95 @@ |
1facf9fc | 5036 | +/* |
027c5e7a | 5037 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 5038 | + * |
5039 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5040 | + * it under the terms of the GNU General Public License as published by | |
5041 | + * the Free Software Foundation; either version 2 of the License, or | |
5042 | + * (at your option) any later version. | |
dece6358 AM |
5043 | + * |
5044 | + * This program is distributed in the hope that it will be useful, | |
5045 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5046 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5047 | + * GNU General Public License for more details. | |
5048 | + * | |
5049 | + * You should have received a copy of the GNU General Public License | |
5050 | + * along with this program; if not, write to the Free Software | |
5051 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5052 | + */ |
5053 | + | |
5054 | +/* | |
5055 | + * sub-routines for dentry cache | |
5056 | + */ | |
5057 | + | |
5058 | +#ifndef __AUFS_DCSUB_H__ | |
5059 | +#define __AUFS_DCSUB_H__ | |
5060 | + | |
5061 | +#ifdef __KERNEL__ | |
5062 | + | |
7f207e10 | 5063 | +#include <linux/dcache.h> |
027c5e7a | 5064 | +#include <linux/fs.h> |
dece6358 AM |
5065 | +#include <linux/types.h> |
5066 | + | |
5067 | +struct dentry; | |
1facf9fc | 5068 | + |
5069 | +struct au_dpage { | |
5070 | + int ndentry; | |
5071 | + struct dentry **dentries; | |
5072 | +}; | |
5073 | + | |
5074 | +struct au_dcsub_pages { | |
5075 | + int ndpage; | |
5076 | + struct au_dpage *dpages; | |
5077 | +}; | |
5078 | + | |
5079 | +/* ---------------------------------------------------------------------- */ | |
5080 | + | |
7f207e10 | 5081 | +/* dcsub.c */ |
1facf9fc | 5082 | +int au_dpages_init(struct au_dcsub_pages *dpages, gfp_t gfp); |
5083 | +void au_dpages_free(struct au_dcsub_pages *dpages); | |
5084 | +typedef int (*au_dpages_test)(struct dentry *dentry, void *arg); | |
5085 | +int au_dcsub_pages(struct au_dcsub_pages *dpages, struct dentry *root, | |
5086 | + au_dpages_test test, void *arg); | |
5087 | +int au_dcsub_pages_rev(struct au_dcsub_pages *dpages, struct dentry *dentry, | |
5088 | + int do_include, au_dpages_test test, void *arg); | |
027c5e7a AM |
5089 | +int au_dcsub_pages_rev_aufs(struct au_dcsub_pages *dpages, |
5090 | + struct dentry *dentry, int do_include); | |
4a4d8108 | 5091 | +int au_test_subdir(struct dentry *d1, struct dentry *d2); |
1facf9fc | 5092 | + |
7f207e10 AM |
5093 | +/* ---------------------------------------------------------------------- */ |
5094 | + | |
027c5e7a AM |
5095 | +static inline int au_d_hashed_positive(struct dentry *d) |
5096 | +{ | |
5097 | + int err; | |
5098 | + struct inode *inode = d->d_inode; | |
5099 | + err = 0; | |
5100 | + if (unlikely(d_unhashed(d) || !inode || !inode->i_nlink)) | |
5101 | + err = -ENOENT; | |
5102 | + return err; | |
5103 | +} | |
5104 | + | |
5105 | +static inline int au_d_alive(struct dentry *d) | |
5106 | +{ | |
5107 | + int err; | |
5108 | + struct inode *inode; | |
5109 | + err = 0; | |
5110 | + if (!IS_ROOT(d)) | |
5111 | + err = au_d_hashed_positive(d); | |
5112 | + else { | |
5113 | + inode = d->d_inode; | |
5114 | + if (unlikely(d_unlinked(d) || !inode || !inode->i_nlink)) | |
5115 | + err = -ENOENT; | |
5116 | + } | |
5117 | + return err; | |
5118 | +} | |
5119 | + | |
5120 | +static inline int au_alive_dir(struct dentry *d) | |
7f207e10 | 5121 | +{ |
027c5e7a AM |
5122 | + int err; |
5123 | + err = au_d_alive(d); | |
5124 | + if (unlikely(err || IS_DEADDIR(d->d_inode))) | |
5125 | + err = -ENOENT; | |
5126 | + return err; | |
7f207e10 AM |
5127 | +} |
5128 | + | |
1facf9fc | 5129 | +#endif /* __KERNEL__ */ |
5130 | +#endif /* __AUFS_DCSUB_H__ */ | |
7f207e10 AM |
5131 | diff -urN /usr/share/empty/fs/aufs/debug.c linux/fs/aufs/debug.c |
5132 | --- /usr/share/empty/fs/aufs/debug.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
5133 | +++ linux/fs/aufs/debug.c 2011-08-24 13:30:24.731313534 +0200 |
5134 | @@ -0,0 +1,486 @@ | |
1facf9fc | 5135 | +/* |
027c5e7a | 5136 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 5137 | + * |
5138 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5139 | + * it under the terms of the GNU General Public License as published by | |
5140 | + * the Free Software Foundation; either version 2 of the License, or | |
5141 | + * (at your option) any later version. | |
dece6358 AM |
5142 | + * |
5143 | + * This program is distributed in the hope that it will be useful, | |
5144 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5145 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5146 | + * GNU General Public License for more details. | |
5147 | + * | |
5148 | + * You should have received a copy of the GNU General Public License | |
5149 | + * along with this program; if not, write to the Free Software | |
5150 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5151 | + */ |
5152 | + | |
5153 | +/* | |
5154 | + * debug print functions | |
5155 | + */ | |
5156 | + | |
dece6358 | 5157 | +#include <linux/module.h> |
7f207e10 | 5158 | +#include <linux/vt_kern.h> |
1facf9fc | 5159 | +#include "aufs.h" |
5160 | + | |
5161 | +int aufs_debug; | |
5162 | +MODULE_PARM_DESC(debug, "debug print"); | |
5163 | +module_param_named(debug, aufs_debug, int, S_IRUGO | S_IWUSR | S_IWGRP); | |
5164 | + | |
5165 | +char *au_plevel = KERN_DEBUG; | |
e49829fe JR |
5166 | +#define dpri(fmt, ...) do { \ |
5167 | + if ((au_plevel \ | |
5168 | + && strcmp(au_plevel, KERN_DEBUG)) \ | |
5169 | + || au_debug_test()) \ | |
5170 | + printk("%s" fmt, au_plevel, ##__VA_ARGS__); \ | |
1facf9fc | 5171 | +} while (0) |
5172 | + | |
5173 | +/* ---------------------------------------------------------------------- */ | |
5174 | + | |
5175 | +void au_dpri_whlist(struct au_nhash *whlist) | |
5176 | +{ | |
5177 | + unsigned long ul, n; | |
5178 | + struct hlist_head *head; | |
5179 | + struct au_vdir_wh *tpos; | |
5180 | + struct hlist_node *pos; | |
5181 | + | |
5182 | + n = whlist->nh_num; | |
5183 | + head = whlist->nh_head; | |
5184 | + for (ul = 0; ul < n; ul++) { | |
5185 | + hlist_for_each_entry(tpos, pos, head, wh_hash) | |
5186 | + dpri("b%d, %.*s, %d\n", | |
5187 | + tpos->wh_bindex, | |
5188 | + tpos->wh_str.len, tpos->wh_str.name, | |
5189 | + tpos->wh_str.len); | |
5190 | + head++; | |
5191 | + } | |
5192 | +} | |
5193 | + | |
5194 | +void au_dpri_vdir(struct au_vdir *vdir) | |
5195 | +{ | |
5196 | + unsigned long ul; | |
5197 | + union au_vdir_deblk_p p; | |
5198 | + unsigned char *o; | |
5199 | + | |
5200 | + if (!vdir || IS_ERR(vdir)) { | |
5201 | + dpri("err %ld\n", PTR_ERR(vdir)); | |
5202 | + return; | |
5203 | + } | |
5204 | + | |
5205 | + dpri("deblk %u, nblk %lu, deblk %p, last{%lu, %p}, ver %lu\n", | |
5206 | + vdir->vd_deblk_sz, vdir->vd_nblk, vdir->vd_deblk, | |
5207 | + vdir->vd_last.ul, vdir->vd_last.p.deblk, vdir->vd_version); | |
5208 | + for (ul = 0; ul < vdir->vd_nblk; ul++) { | |
5209 | + p.deblk = vdir->vd_deblk[ul]; | |
5210 | + o = p.deblk; | |
5211 | + dpri("[%lu]: %p\n", ul, o); | |
5212 | + } | |
5213 | +} | |
5214 | + | |
53392da6 | 5215 | +static int do_pri_inode(aufs_bindex_t bindex, struct inode *inode, int hn, |
1facf9fc | 5216 | + struct dentry *wh) |
5217 | +{ | |
5218 | + char *n = NULL; | |
5219 | + int l = 0; | |
5220 | + | |
5221 | + if (!inode || IS_ERR(inode)) { | |
5222 | + dpri("i%d: err %ld\n", bindex, PTR_ERR(inode)); | |
5223 | + return -1; | |
5224 | + } | |
5225 | + | |
5226 | + /* the type of i_blocks depends upon CONFIG_LSF */ | |
5227 | + BUILD_BUG_ON(sizeof(inode->i_blocks) != sizeof(unsigned long) | |
5228 | + && sizeof(inode->i_blocks) != sizeof(u64)); | |
5229 | + if (wh) { | |
5230 | + n = (void *)wh->d_name.name; | |
5231 | + l = wh->d_name.len; | |
5232 | + } | |
5233 | + | |
53392da6 AM |
5234 | + dpri("i%d: %p, i%lu, %s, cnt %d, nl %u, 0%o, sz %llu, blk %llu," |
5235 | + " hn %d, ct %lld, np %lu, st 0x%lx, f 0x%x, v %llu, g %x%s%.*s\n", | |
5236 | + bindex, inode, | |
1facf9fc | 5237 | + inode->i_ino, inode->i_sb ? au_sbtype(inode->i_sb) : "??", |
5238 | + atomic_read(&inode->i_count), inode->i_nlink, inode->i_mode, | |
5239 | + i_size_read(inode), (unsigned long long)inode->i_blocks, | |
53392da6 | 5240 | + hn, (long long)timespec_to_ns(&inode->i_ctime) & 0x0ffff, |
1facf9fc | 5241 | + inode->i_mapping ? inode->i_mapping->nrpages : 0, |
b752ccd1 AM |
5242 | + inode->i_state, inode->i_flags, inode->i_version, |
5243 | + inode->i_generation, | |
1facf9fc | 5244 | + l ? ", wh " : "", l, n); |
5245 | + return 0; | |
5246 | +} | |
5247 | + | |
5248 | +void au_dpri_inode(struct inode *inode) | |
5249 | +{ | |
5250 | + struct au_iinfo *iinfo; | |
5251 | + aufs_bindex_t bindex; | |
53392da6 | 5252 | + int err, hn; |
1facf9fc | 5253 | + |
53392da6 | 5254 | + err = do_pri_inode(-1, inode, -1, NULL); |
1facf9fc | 5255 | + if (err || !au_test_aufs(inode->i_sb)) |
5256 | + return; | |
5257 | + | |
5258 | + iinfo = au_ii(inode); | |
5259 | + if (!iinfo) | |
5260 | + return; | |
5261 | + dpri("i-1: bstart %d, bend %d, gen %d\n", | |
5262 | + iinfo->ii_bstart, iinfo->ii_bend, au_iigen(inode)); | |
5263 | + if (iinfo->ii_bstart < 0) | |
5264 | + return; | |
53392da6 AM |
5265 | + hn = 0; |
5266 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; bindex++) { | |
5267 | + hn = !!au_hn(iinfo->ii_hinode + bindex); | |
5268 | + do_pri_inode(bindex, iinfo->ii_hinode[0 + bindex].hi_inode, hn, | |
1facf9fc | 5269 | + iinfo->ii_hinode[0 + bindex].hi_whdentry); |
53392da6 | 5270 | + } |
1facf9fc | 5271 | +} |
5272 | + | |
2cbb1c4b JR |
5273 | +void au_dpri_dalias(struct inode *inode) |
5274 | +{ | |
5275 | + struct dentry *d; | |
5276 | + | |
5277 | + spin_lock(&inode->i_lock); | |
5278 | + list_for_each_entry(d, &inode->i_dentry, d_alias) | |
5279 | + au_dpri_dentry(d); | |
5280 | + spin_unlock(&inode->i_lock); | |
5281 | +} | |
5282 | + | |
1facf9fc | 5283 | +static int do_pri_dentry(aufs_bindex_t bindex, struct dentry *dentry) |
5284 | +{ | |
5285 | + struct dentry *wh = NULL; | |
53392da6 | 5286 | + int hn; |
1facf9fc | 5287 | + |
5288 | + if (!dentry || IS_ERR(dentry)) { | |
5289 | + dpri("d%d: err %ld\n", bindex, PTR_ERR(dentry)); | |
5290 | + return -1; | |
5291 | + } | |
5292 | + /* do not call dget_parent() here */ | |
027c5e7a | 5293 | + /* note: access d_xxx without d_lock */ |
1facf9fc | 5294 | + dpri("d%d: %.*s?/%.*s, %s, cnt %d, flags 0x%x\n", |
5295 | + bindex, | |
5296 | + AuDLNPair(dentry->d_parent), AuDLNPair(dentry), | |
5297 | + dentry->d_sb ? au_sbtype(dentry->d_sb) : "??", | |
027c5e7a | 5298 | + dentry->d_count, dentry->d_flags); |
53392da6 | 5299 | + hn = -1; |
1facf9fc | 5300 | + if (bindex >= 0 && dentry->d_inode && au_test_aufs(dentry->d_sb)) { |
5301 | + struct au_iinfo *iinfo = au_ii(dentry->d_inode); | |
53392da6 AM |
5302 | + if (iinfo) { |
5303 | + hn = !!au_hn(iinfo->ii_hinode + bindex); | |
1facf9fc | 5304 | + wh = iinfo->ii_hinode[0 + bindex].hi_whdentry; |
53392da6 | 5305 | + } |
1facf9fc | 5306 | + } |
53392da6 | 5307 | + do_pri_inode(bindex, dentry->d_inode, hn, wh); |
1facf9fc | 5308 | + return 0; |
5309 | +} | |
5310 | + | |
5311 | +void au_dpri_dentry(struct dentry *dentry) | |
5312 | +{ | |
5313 | + struct au_dinfo *dinfo; | |
5314 | + aufs_bindex_t bindex; | |
5315 | + int err; | |
4a4d8108 | 5316 | + struct au_hdentry *hdp; |
1facf9fc | 5317 | + |
5318 | + err = do_pri_dentry(-1, dentry); | |
5319 | + if (err || !au_test_aufs(dentry->d_sb)) | |
5320 | + return; | |
5321 | + | |
5322 | + dinfo = au_di(dentry); | |
5323 | + if (!dinfo) | |
5324 | + return; | |
5325 | + dpri("d-1: bstart %d, bend %d, bwh %d, bdiropq %d, gen %d\n", | |
5326 | + dinfo->di_bstart, dinfo->di_bend, | |
5327 | + dinfo->di_bwh, dinfo->di_bdiropq, au_digen(dentry)); | |
5328 | + if (dinfo->di_bstart < 0) | |
5329 | + return; | |
4a4d8108 | 5330 | + hdp = dinfo->di_hdentry; |
1facf9fc | 5331 | + for (bindex = dinfo->di_bstart; bindex <= dinfo->di_bend; bindex++) |
4a4d8108 | 5332 | + do_pri_dentry(bindex, hdp[0 + bindex].hd_dentry); |
1facf9fc | 5333 | +} |
5334 | + | |
5335 | +static int do_pri_file(aufs_bindex_t bindex, struct file *file) | |
5336 | +{ | |
5337 | + char a[32]; | |
5338 | + | |
5339 | + if (!file || IS_ERR(file)) { | |
5340 | + dpri("f%d: err %ld\n", bindex, PTR_ERR(file)); | |
5341 | + return -1; | |
5342 | + } | |
5343 | + a[0] = 0; | |
5344 | + if (bindex < 0 | |
5345 | + && file->f_dentry | |
5346 | + && au_test_aufs(file->f_dentry->d_sb) | |
5347 | + && au_fi(file)) | |
e49829fe | 5348 | + snprintf(a, sizeof(a), ", gen %d, mmapped %d", |
2cbb1c4b | 5349 | + au_figen(file), atomic_read(&au_fi(file)->fi_mmapped)); |
b752ccd1 | 5350 | + dpri("f%d: mode 0x%x, flags 0%o, cnt %ld, v %llu, pos %llu%s\n", |
1facf9fc | 5351 | + bindex, file->f_mode, file->f_flags, (long)file_count(file), |
b752ccd1 | 5352 | + file->f_version, file->f_pos, a); |
1facf9fc | 5353 | + if (file->f_dentry) |
5354 | + do_pri_dentry(bindex, file->f_dentry); | |
5355 | + return 0; | |
5356 | +} | |
5357 | + | |
5358 | +void au_dpri_file(struct file *file) | |
5359 | +{ | |
5360 | + struct au_finfo *finfo; | |
4a4d8108 AM |
5361 | + struct au_fidir *fidir; |
5362 | + struct au_hfile *hfile; | |
1facf9fc | 5363 | + aufs_bindex_t bindex; |
5364 | + int err; | |
5365 | + | |
5366 | + err = do_pri_file(-1, file); | |
5367 | + if (err || !file->f_dentry || !au_test_aufs(file->f_dentry->d_sb)) | |
5368 | + return; | |
5369 | + | |
5370 | + finfo = au_fi(file); | |
5371 | + if (!finfo) | |
5372 | + return; | |
4a4d8108 | 5373 | + if (finfo->fi_btop < 0) |
1facf9fc | 5374 | + return; |
4a4d8108 AM |
5375 | + fidir = finfo->fi_hdir; |
5376 | + if (!fidir) | |
5377 | + do_pri_file(finfo->fi_btop, finfo->fi_htop.hf_file); | |
5378 | + else | |
e49829fe JR |
5379 | + for (bindex = finfo->fi_btop; |
5380 | + bindex >= 0 && bindex <= fidir->fd_bbot; | |
4a4d8108 AM |
5381 | + bindex++) { |
5382 | + hfile = fidir->fd_hfile + bindex; | |
5383 | + do_pri_file(bindex, hfile ? hfile->hf_file : NULL); | |
5384 | + } | |
1facf9fc | 5385 | +} |
5386 | + | |
5387 | +static int do_pri_br(aufs_bindex_t bindex, struct au_branch *br) | |
5388 | +{ | |
5389 | + struct vfsmount *mnt; | |
5390 | + struct super_block *sb; | |
5391 | + | |
5392 | + if (!br || IS_ERR(br)) | |
5393 | + goto out; | |
5394 | + mnt = br->br_mnt; | |
5395 | + if (!mnt || IS_ERR(mnt)) | |
5396 | + goto out; | |
5397 | + sb = mnt->mnt_sb; | |
5398 | + if (!sb || IS_ERR(sb)) | |
5399 | + goto out; | |
5400 | + | |
5401 | + dpri("s%d: {perm 0x%x, cnt %d, wbr %p}, " | |
b752ccd1 | 5402 | + "%s, dev 0x%02x%02x, flags 0x%lx, cnt %d, active %d, " |
1facf9fc | 5403 | + "xino %d\n", |
5404 | + bindex, br->br_perm, atomic_read(&br->br_count), br->br_wbr, | |
5405 | + au_sbtype(sb), MAJOR(sb->s_dev), MINOR(sb->s_dev), | |
b752ccd1 | 5406 | + sb->s_flags, sb->s_count, |
1facf9fc | 5407 | + atomic_read(&sb->s_active), !!br->br_xino.xi_file); |
5408 | + return 0; | |
5409 | + | |
4f0767ce | 5410 | +out: |
1facf9fc | 5411 | + dpri("s%d: err %ld\n", bindex, PTR_ERR(br)); |
5412 | + return -1; | |
5413 | +} | |
5414 | + | |
5415 | +void au_dpri_sb(struct super_block *sb) | |
5416 | +{ | |
5417 | + struct au_sbinfo *sbinfo; | |
5418 | + aufs_bindex_t bindex; | |
5419 | + int err; | |
5420 | + /* to reuduce stack size */ | |
5421 | + struct { | |
5422 | + struct vfsmount mnt; | |
5423 | + struct au_branch fake; | |
5424 | + } *a; | |
5425 | + | |
5426 | + /* this function can be called from magic sysrq */ | |
5427 | + a = kzalloc(sizeof(*a), GFP_ATOMIC); | |
5428 | + if (unlikely(!a)) { | |
5429 | + dpri("no memory\n"); | |
5430 | + return; | |
5431 | + } | |
5432 | + | |
5433 | + a->mnt.mnt_sb = sb; | |
5434 | + a->fake.br_perm = 0; | |
5435 | + a->fake.br_mnt = &a->mnt; | |
5436 | + a->fake.br_xino.xi_file = NULL; | |
5437 | + atomic_set(&a->fake.br_count, 0); | |
5438 | + smp_mb(); /* atomic_set */ | |
5439 | + err = do_pri_br(-1, &a->fake); | |
5440 | + kfree(a); | |
5441 | + dpri("dev 0x%x\n", sb->s_dev); | |
5442 | + if (err || !au_test_aufs(sb)) | |
5443 | + return; | |
5444 | + | |
5445 | + sbinfo = au_sbi(sb); | |
5446 | + if (!sbinfo) | |
5447 | + return; | |
5448 | + dpri("nw %d, gen %u, kobj %d\n", | |
5449 | + atomic_read(&sbinfo->si_nowait.nw_len), sbinfo->si_generation, | |
5450 | + atomic_read(&sbinfo->si_kobj.kref.refcount)); | |
5451 | + for (bindex = 0; bindex <= sbinfo->si_bend; bindex++) | |
5452 | + do_pri_br(bindex, sbinfo->si_branch[0 + bindex]); | |
5453 | +} | |
5454 | + | |
5455 | +/* ---------------------------------------------------------------------- */ | |
5456 | + | |
5457 | +void au_dbg_sleep_jiffy(int jiffy) | |
5458 | +{ | |
5459 | + while (jiffy) | |
5460 | + jiffy = schedule_timeout_uninterruptible(jiffy); | |
5461 | +} | |
5462 | + | |
5463 | +void au_dbg_iattr(struct iattr *ia) | |
5464 | +{ | |
5465 | +#define AuBit(name) if (ia->ia_valid & ATTR_ ## name) \ | |
5466 | + dpri(#name "\n") | |
5467 | + AuBit(MODE); | |
5468 | + AuBit(UID); | |
5469 | + AuBit(GID); | |
5470 | + AuBit(SIZE); | |
5471 | + AuBit(ATIME); | |
5472 | + AuBit(MTIME); | |
5473 | + AuBit(CTIME); | |
5474 | + AuBit(ATIME_SET); | |
5475 | + AuBit(MTIME_SET); | |
5476 | + AuBit(FORCE); | |
5477 | + AuBit(ATTR_FLAG); | |
5478 | + AuBit(KILL_SUID); | |
5479 | + AuBit(KILL_SGID); | |
5480 | + AuBit(FILE); | |
5481 | + AuBit(KILL_PRIV); | |
5482 | + AuBit(OPEN); | |
5483 | + AuBit(TIMES_SET); | |
5484 | +#undef AuBit | |
5485 | + dpri("ia_file %p\n", ia->ia_file); | |
5486 | +} | |
5487 | + | |
5488 | +/* ---------------------------------------------------------------------- */ | |
5489 | + | |
027c5e7a AM |
5490 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line) |
5491 | +{ | |
5492 | + struct inode *h_inode, *inode = dentry->d_inode; | |
5493 | + struct dentry *h_dentry; | |
5494 | + aufs_bindex_t bindex, bend, bi; | |
5495 | + | |
5496 | + if (!inode /* || au_di(dentry)->di_lsc == AuLsc_DI_TMP */) | |
5497 | + return; | |
5498 | + | |
5499 | + bend = au_dbend(dentry); | |
5500 | + bi = au_ibend(inode); | |
5501 | + if (bi < bend) | |
5502 | + bend = bi; | |
5503 | + bindex = au_dbstart(dentry); | |
5504 | + bi = au_ibstart(inode); | |
5505 | + if (bi > bindex) | |
5506 | + bindex = bi; | |
5507 | + | |
5508 | + for (; bindex <= bend; bindex++) { | |
5509 | + h_dentry = au_h_dptr(dentry, bindex); | |
5510 | + if (!h_dentry) | |
5511 | + continue; | |
5512 | + h_inode = au_h_iptr(inode, bindex); | |
5513 | + if (unlikely(h_inode != h_dentry->d_inode)) { | |
5514 | + int old = au_debug_test(); | |
5515 | + if (!old) | |
5516 | + au_debug(1); | |
5517 | + AuDbg("b%d, %s:%d\n", bindex, func, line); | |
5518 | + AuDbgDentry(dentry); | |
5519 | + AuDbgInode(inode); | |
5520 | + if (!old) | |
5521 | + au_debug(0); | |
5522 | + BUG(); | |
5523 | + } | |
5524 | + } | |
5525 | +} | |
5526 | + | |
1facf9fc | 5527 | +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen) |
5528 | +{ | |
5529 | + struct dentry *parent; | |
5530 | + | |
5531 | + parent = dget_parent(dentry); | |
027c5e7a AM |
5532 | + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)); |
5533 | + AuDebugOn(IS_ROOT(dentry)); | |
5534 | + AuDebugOn(au_digen_test(parent, sigen)); | |
1facf9fc | 5535 | + dput(parent); |
5536 | +} | |
5537 | + | |
5538 | +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen) | |
5539 | +{ | |
5540 | + struct dentry *parent; | |
027c5e7a | 5541 | + struct inode *inode; |
1facf9fc | 5542 | + |
5543 | + parent = dget_parent(dentry); | |
027c5e7a AM |
5544 | + inode = dentry->d_inode; |
5545 | + AuDebugOn(inode && S_ISDIR(dentry->d_inode->i_mode)); | |
5546 | + AuDebugOn(au_digen_test(parent, sigen)); | |
1facf9fc | 5547 | + dput(parent); |
5548 | +} | |
5549 | + | |
5550 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen) | |
5551 | +{ | |
5552 | + int err, i, j; | |
5553 | + struct au_dcsub_pages dpages; | |
5554 | + struct au_dpage *dpage; | |
5555 | + struct dentry **dentries; | |
5556 | + | |
5557 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
5558 | + AuDebugOn(err); | |
027c5e7a | 5559 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/1); |
1facf9fc | 5560 | + AuDebugOn(err); |
5561 | + for (i = dpages.ndpage - 1; !err && i >= 0; i--) { | |
5562 | + dpage = dpages.dpages + i; | |
5563 | + dentries = dpage->dentries; | |
5564 | + for (j = dpage->ndentry - 1; !err && j >= 0; j--) | |
027c5e7a | 5565 | + AuDebugOn(au_digen_test(dentries[j], sigen)); |
1facf9fc | 5566 | + } |
5567 | + au_dpages_free(&dpages); | |
5568 | +} | |
5569 | + | |
1facf9fc | 5570 | +void au_dbg_verify_kthread(void) |
5571 | +{ | |
53392da6 | 5572 | + if (au_wkq_test()) { |
1facf9fc | 5573 | + au_dbg_blocked(); |
7f207e10 | 5574 | + WARN_ON(1); |
1facf9fc | 5575 | + } |
5576 | +} | |
5577 | + | |
5578 | +/* ---------------------------------------------------------------------- */ | |
5579 | + | |
5580 | +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo __maybe_unused) | |
5581 | +{ | |
5582 | +#ifdef AuForceNoPlink | |
5583 | + au_opt_clr(sbinfo->si_mntflags, PLINK); | |
5584 | +#endif | |
5585 | +#ifdef AuForceNoXino | |
5586 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
5587 | +#endif | |
5588 | +#ifdef AuForceNoRefrof | |
5589 | + au_opt_clr(sbinfo->si_mntflags, REFROF); | |
5590 | +#endif | |
4a4d8108 AM |
5591 | +#ifdef AuForceHnotify |
5592 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_HNOTIFY); | |
1facf9fc | 5593 | +#endif |
1308ab2a | 5594 | +#ifdef AuForceRd0 |
5595 | + sbinfo->si_rdblk = 0; | |
5596 | + sbinfo->si_rdhash = 0; | |
5597 | +#endif | |
1facf9fc | 5598 | +} |
5599 | + | |
5600 | +int __init au_debug_init(void) | |
5601 | +{ | |
5602 | + aufs_bindex_t bindex; | |
5603 | + struct au_vdir_destr destr; | |
5604 | + | |
5605 | + bindex = -1; | |
5606 | + AuDebugOn(bindex >= 0); | |
5607 | + | |
5608 | + destr.len = -1; | |
5609 | + AuDebugOn(destr.len < NAME_MAX); | |
5610 | + | |
5611 | +#ifdef CONFIG_4KSTACKS | |
4a4d8108 | 5612 | + pr_warning("CONFIG_4KSTACKS is defined.\n"); |
1facf9fc | 5613 | +#endif |
5614 | + | |
5615 | +#ifdef AuForceNoBrs | |
5616 | + sysaufs_brs = 0; | |
5617 | +#endif | |
5618 | + | |
5619 | + return 0; | |
5620 | +} | |
7f207e10 AM |
5621 | diff -urN /usr/share/empty/fs/aufs/debug.h linux/fs/aufs/debug.h |
5622 | --- /usr/share/empty/fs/aufs/debug.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 5623 | +++ linux/fs/aufs/debug.h 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 5624 | @@ -0,0 +1,252 @@ |
1facf9fc | 5625 | +/* |
027c5e7a | 5626 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 5627 | + * |
5628 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5629 | + * it under the terms of the GNU General Public License as published by | |
5630 | + * the Free Software Foundation; either version 2 of the License, or | |
5631 | + * (at your option) any later version. | |
dece6358 AM |
5632 | + * |
5633 | + * This program is distributed in the hope that it will be useful, | |
5634 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5635 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5636 | + * GNU General Public License for more details. | |
5637 | + * | |
5638 | + * You should have received a copy of the GNU General Public License | |
5639 | + * along with this program; if not, write to the Free Software | |
5640 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5641 | + */ |
5642 | + | |
5643 | +/* | |
5644 | + * debug print functions | |
5645 | + */ | |
5646 | + | |
5647 | +#ifndef __AUFS_DEBUG_H__ | |
5648 | +#define __AUFS_DEBUG_H__ | |
5649 | + | |
5650 | +#ifdef __KERNEL__ | |
5651 | + | |
1308ab2a | 5652 | +#include <asm/system.h> |
dece6358 | 5653 | +#include <linux/bug.h> |
7f207e10 | 5654 | +/* #include <linux/err.h> */ |
1308ab2a | 5655 | +#include <linux/init.h> |
4a4d8108 AM |
5656 | +#include <linux/module.h> |
5657 | +#include <linux/kallsyms.h> | |
7f207e10 | 5658 | +/* #include <linux/kernel.h> */ |
1facf9fc | 5659 | +#include <linux/delay.h> |
7f207e10 | 5660 | +/* #include <linux/kd.h> */ |
1facf9fc | 5661 | +#include <linux/sysrq.h> |
5662 | +#include <linux/aufs_type.h> | |
5663 | + | |
4a4d8108 AM |
5664 | +#include <asm/system.h> |
5665 | + | |
1facf9fc | 5666 | +#ifdef CONFIG_AUFS_DEBUG |
5667 | +#define AuDebugOn(a) BUG_ON(a) | |
5668 | + | |
5669 | +/* module parameter */ | |
5670 | +extern int aufs_debug; | |
5671 | +static inline void au_debug(int n) | |
5672 | +{ | |
5673 | + aufs_debug = n; | |
5674 | + smp_mb(); | |
5675 | +} | |
5676 | + | |
5677 | +static inline int au_debug_test(void) | |
5678 | +{ | |
5679 | + return aufs_debug; | |
5680 | +} | |
5681 | +#else | |
5682 | +#define AuDebugOn(a) do {} while (0) | |
4a4d8108 AM |
5683 | +AuStubVoid(au_debug, int n) |
5684 | +AuStubInt0(au_debug_test, void) | |
1facf9fc | 5685 | +#endif /* CONFIG_AUFS_DEBUG */ |
5686 | + | |
5687 | +/* ---------------------------------------------------------------------- */ | |
5688 | + | |
5689 | +/* debug print */ | |
5690 | + | |
4a4d8108 | 5691 | +#define AuDbg(fmt, ...) do { \ |
1facf9fc | 5692 | + if (au_debug_test()) \ |
4a4d8108 | 5693 | + pr_debug("DEBUG: " fmt, ##__VA_ARGS__); \ |
1facf9fc | 5694 | +} while (0) |
4a4d8108 AM |
5695 | +#define AuLabel(l) AuDbg(#l "\n") |
5696 | +#define AuIOErr(fmt, ...) pr_err("I/O Error, " fmt, ##__VA_ARGS__) | |
5697 | +#define AuWarn1(fmt, ...) do { \ | |
1facf9fc | 5698 | + static unsigned char _c; \ |
5699 | + if (!_c++) \ | |
4a4d8108 | 5700 | + pr_warning(fmt, ##__VA_ARGS__); \ |
1facf9fc | 5701 | +} while (0) |
5702 | + | |
4a4d8108 | 5703 | +#define AuErr1(fmt, ...) do { \ |
1facf9fc | 5704 | + static unsigned char _c; \ |
5705 | + if (!_c++) \ | |
4a4d8108 | 5706 | + pr_err(fmt, ##__VA_ARGS__); \ |
1facf9fc | 5707 | +} while (0) |
5708 | + | |
4a4d8108 | 5709 | +#define AuIOErr1(fmt, ...) do { \ |
1facf9fc | 5710 | + static unsigned char _c; \ |
5711 | + if (!_c++) \ | |
4a4d8108 | 5712 | + AuIOErr(fmt, ##__VA_ARGS__); \ |
1facf9fc | 5713 | +} while (0) |
5714 | + | |
5715 | +#define AuUnsupportMsg "This operation is not supported." \ | |
5716 | + " Please report this application to aufs-users ML." | |
4a4d8108 AM |
5717 | +#define AuUnsupport(fmt, ...) do { \ |
5718 | + pr_err(AuUnsupportMsg "\n" fmt, ##__VA_ARGS__); \ | |
1facf9fc | 5719 | + dump_stack(); \ |
5720 | +} while (0) | |
5721 | + | |
5722 | +#define AuTraceErr(e) do { \ | |
5723 | + if (unlikely((e) < 0)) \ | |
5724 | + AuDbg("err %d\n", (int)(e)); \ | |
5725 | +} while (0) | |
5726 | + | |
5727 | +#define AuTraceErrPtr(p) do { \ | |
5728 | + if (IS_ERR(p)) \ | |
5729 | + AuDbg("err %ld\n", PTR_ERR(p)); \ | |
5730 | +} while (0) | |
5731 | + | |
5732 | +/* dirty macros for debug print, use with "%.*s" and caution */ | |
5733 | +#define AuLNPair(qstr) (qstr)->len, (qstr)->name | |
5734 | +#define AuDLNPair(d) AuLNPair(&(d)->d_name) | |
5735 | + | |
5736 | +/* ---------------------------------------------------------------------- */ | |
5737 | + | |
5738 | +struct au_sbinfo; | |
5739 | +struct au_finfo; | |
dece6358 | 5740 | +struct dentry; |
1facf9fc | 5741 | +#ifdef CONFIG_AUFS_DEBUG |
5742 | +extern char *au_plevel; | |
5743 | +struct au_nhash; | |
5744 | +void au_dpri_whlist(struct au_nhash *whlist); | |
5745 | +struct au_vdir; | |
5746 | +void au_dpri_vdir(struct au_vdir *vdir); | |
dece6358 | 5747 | +struct inode; |
1facf9fc | 5748 | +void au_dpri_inode(struct inode *inode); |
2cbb1c4b | 5749 | +void au_dpri_dalias(struct inode *inode); |
1facf9fc | 5750 | +void au_dpri_dentry(struct dentry *dentry); |
dece6358 | 5751 | +struct file; |
1facf9fc | 5752 | +void au_dpri_file(struct file *filp); |
dece6358 | 5753 | +struct super_block; |
1facf9fc | 5754 | +void au_dpri_sb(struct super_block *sb); |
5755 | + | |
5756 | +void au_dbg_sleep_jiffy(int jiffy); | |
dece6358 | 5757 | +struct iattr; |
1facf9fc | 5758 | +void au_dbg_iattr(struct iattr *ia); |
5759 | + | |
027c5e7a AM |
5760 | +#define au_dbg_verify_dinode(d) __au_dbg_verify_dinode(d, __func__, __LINE__) |
5761 | +void __au_dbg_verify_dinode(struct dentry *dentry, const char *func, int line); | |
1facf9fc | 5762 | +void au_dbg_verify_dir_parent(struct dentry *dentry, unsigned int sigen); |
5763 | +void au_dbg_verify_nondir_parent(struct dentry *dentry, unsigned int sigen); | |
5764 | +void au_dbg_verify_gen(struct dentry *parent, unsigned int sigen); | |
1facf9fc | 5765 | +void au_dbg_verify_kthread(void); |
5766 | + | |
5767 | +int __init au_debug_init(void); | |
5768 | +void au_debug_sbinfo_init(struct au_sbinfo *sbinfo); | |
5769 | +#define AuDbgWhlist(w) do { \ | |
5770 | + AuDbg(#w "\n"); \ | |
5771 | + au_dpri_whlist(w); \ | |
5772 | +} while (0) | |
5773 | + | |
5774 | +#define AuDbgVdir(v) do { \ | |
5775 | + AuDbg(#v "\n"); \ | |
5776 | + au_dpri_vdir(v); \ | |
5777 | +} while (0) | |
5778 | + | |
5779 | +#define AuDbgInode(i) do { \ | |
5780 | + AuDbg(#i "\n"); \ | |
5781 | + au_dpri_inode(i); \ | |
5782 | +} while (0) | |
5783 | + | |
2cbb1c4b JR |
5784 | +#define AuDbgDAlias(i) do { \ |
5785 | + AuDbg(#i "\n"); \ | |
5786 | + au_dpri_dalias(i); \ | |
5787 | +} while (0) | |
5788 | + | |
1facf9fc | 5789 | +#define AuDbgDentry(d) do { \ |
5790 | + AuDbg(#d "\n"); \ | |
5791 | + au_dpri_dentry(d); \ | |
5792 | +} while (0) | |
5793 | + | |
5794 | +#define AuDbgFile(f) do { \ | |
5795 | + AuDbg(#f "\n"); \ | |
5796 | + au_dpri_file(f); \ | |
5797 | +} while (0) | |
5798 | + | |
5799 | +#define AuDbgSb(sb) do { \ | |
5800 | + AuDbg(#sb "\n"); \ | |
5801 | + au_dpri_sb(sb); \ | |
5802 | +} while (0) | |
5803 | + | |
5804 | +#define AuDbgSleep(sec) do { \ | |
5805 | + AuDbg("sleep %d sec\n", sec); \ | |
5806 | + ssleep(sec); \ | |
5807 | +} while (0) | |
5808 | + | |
5809 | +#define AuDbgSleepJiffy(jiffy) do { \ | |
5810 | + AuDbg("sleep %d jiffies\n", jiffy); \ | |
5811 | + au_dbg_sleep_jiffy(jiffy); \ | |
5812 | +} while (0) | |
5813 | + | |
5814 | +#define AuDbgIAttr(ia) do { \ | |
5815 | + AuDbg("ia_valid 0x%x\n", (ia)->ia_valid); \ | |
5816 | + au_dbg_iattr(ia); \ | |
5817 | +} while (0) | |
4a4d8108 AM |
5818 | + |
5819 | +#define AuDbgSym(addr) do { \ | |
5820 | + char sym[KSYM_SYMBOL_LEN]; \ | |
5821 | + sprint_symbol(sym, (unsigned long)addr); \ | |
5822 | + AuDbg("%s\n", sym); \ | |
5823 | +} while (0) | |
5824 | + | |
5825 | +#define AuInfoSym(addr) do { \ | |
5826 | + char sym[KSYM_SYMBOL_LEN]; \ | |
5827 | + sprint_symbol(sym, (unsigned long)addr); \ | |
5828 | + AuInfo("%s\n", sym); \ | |
5829 | +} while (0) | |
1facf9fc | 5830 | +#else |
027c5e7a | 5831 | +AuStubVoid(au_dbg_verify_dinode, struct dentry *dentry) |
4a4d8108 AM |
5832 | +AuStubVoid(au_dbg_verify_dir_parent, struct dentry *dentry, unsigned int sigen) |
5833 | +AuStubVoid(au_dbg_verify_nondir_parent, struct dentry *dentry, | |
5834 | + unsigned int sigen) | |
5835 | +AuStubVoid(au_dbg_verify_gen, struct dentry *parent, unsigned int sigen) | |
5836 | +AuStubVoid(au_dbg_verify_kthread, void) | |
5837 | +AuStubInt0(__init au_debug_init, void) | |
5838 | +AuStubVoid(au_debug_sbinfo_init, struct au_sbinfo *sbinfo) | |
1facf9fc | 5839 | + |
1facf9fc | 5840 | +#define AuDbgWhlist(w) do {} while (0) |
5841 | +#define AuDbgVdir(v) do {} while (0) | |
5842 | +#define AuDbgInode(i) do {} while (0) | |
2cbb1c4b | 5843 | +#define AuDbgDAlias(i) do {} while (0) |
1facf9fc | 5844 | +#define AuDbgDentry(d) do {} while (0) |
5845 | +#define AuDbgFile(f) do {} while (0) | |
5846 | +#define AuDbgSb(sb) do {} while (0) | |
5847 | +#define AuDbgSleep(sec) do {} while (0) | |
5848 | +#define AuDbgSleepJiffy(jiffy) do {} while (0) | |
5849 | +#define AuDbgIAttr(ia) do {} while (0) | |
4a4d8108 AM |
5850 | +#define AuDbgSym(addr) do {} while (0) |
5851 | +#define AuInfoSym(addr) do {} while (0) | |
1facf9fc | 5852 | +#endif /* CONFIG_AUFS_DEBUG */ |
5853 | + | |
5854 | +/* ---------------------------------------------------------------------- */ | |
5855 | + | |
5856 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
5857 | +int __init au_sysrq_init(void); | |
5858 | +void au_sysrq_fin(void); | |
5859 | + | |
5860 | +#ifdef CONFIG_HW_CONSOLE | |
5861 | +#define au_dbg_blocked() do { \ | |
5862 | + WARN_ON(1); \ | |
0c5527e5 | 5863 | + handle_sysrq('w'); \ |
1facf9fc | 5864 | +} while (0) |
5865 | +#else | |
4a4d8108 | 5866 | +AuStubVoid(au_dbg_blocked, void) |
1facf9fc | 5867 | +#endif |
5868 | + | |
5869 | +#else | |
4a4d8108 AM |
5870 | +AuStubInt0(__init au_sysrq_init, void) |
5871 | +AuStubVoid(au_sysrq_fin, void) | |
5872 | +AuStubVoid(au_dbg_blocked, void) | |
1facf9fc | 5873 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ |
5874 | + | |
5875 | +#endif /* __KERNEL__ */ | |
5876 | +#endif /* __AUFS_DEBUG_H__ */ | |
7f207e10 AM |
5877 | diff -urN /usr/share/empty/fs/aufs/dentry.c linux/fs/aufs/dentry.c |
5878 | --- /usr/share/empty/fs/aufs/dentry.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 5879 | +++ linux/fs/aufs/dentry.c 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 5880 | @@ -0,0 +1,1140 @@ |
1facf9fc | 5881 | +/* |
027c5e7a | 5882 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 5883 | + * |
5884 | + * This program, aufs is free software; you can redistribute it and/or modify | |
5885 | + * it under the terms of the GNU General Public License as published by | |
5886 | + * the Free Software Foundation; either version 2 of the License, or | |
5887 | + * (at your option) any later version. | |
dece6358 AM |
5888 | + * |
5889 | + * This program is distributed in the hope that it will be useful, | |
5890 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
5891 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
5892 | + * GNU General Public License for more details. | |
5893 | + * | |
5894 | + * You should have received a copy of the GNU General Public License | |
5895 | + * along with this program; if not, write to the Free Software | |
5896 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 5897 | + */ |
5898 | + | |
5899 | +/* | |
5900 | + * lookup and dentry operations | |
5901 | + */ | |
5902 | + | |
dece6358 | 5903 | +#include <linux/namei.h> |
1facf9fc | 5904 | +#include "aufs.h" |
5905 | + | |
5906 | +static void au_h_nd(struct nameidata *h_nd, struct nameidata *nd) | |
5907 | +{ | |
5908 | + if (nd) { | |
5909 | + *h_nd = *nd; | |
5910 | + | |
5911 | + /* | |
5912 | + * gave up supporting LOOKUP_CREATE/OPEN for lower fs, | |
5913 | + * due to whiteout and branch permission. | |
5914 | + */ | |
5915 | + h_nd->flags &= ~(/*LOOKUP_PARENT |*/ LOOKUP_OPEN | LOOKUP_CREATE | |
b752ccd1 | 5916 | + | LOOKUP_FOLLOW | LOOKUP_EXCL); |
1facf9fc | 5917 | + /* unnecessary? */ |
5918 | + h_nd->intent.open.file = NULL; | |
5919 | + } else | |
5920 | + memset(h_nd, 0, sizeof(*h_nd)); | |
5921 | +} | |
5922 | + | |
5923 | +struct au_lkup_one_args { | |
5924 | + struct dentry **errp; | |
5925 | + struct qstr *name; | |
5926 | + struct dentry *h_parent; | |
5927 | + struct au_branch *br; | |
5928 | + struct nameidata *nd; | |
5929 | +}; | |
5930 | + | |
5931 | +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent, | |
5932 | + struct au_branch *br, struct nameidata *nd) | |
5933 | +{ | |
5934 | + struct dentry *h_dentry; | |
5935 | + int err; | |
5936 | + struct nameidata h_nd; | |
5937 | + | |
5938 | + if (au_test_fs_null_nd(h_parent->d_sb)) | |
5939 | + return vfsub_lookup_one_len(name->name, h_parent, name->len); | |
5940 | + | |
5941 | + au_h_nd(&h_nd, nd); | |
5942 | + h_nd.path.dentry = h_parent; | |
5943 | + h_nd.path.mnt = br->br_mnt; | |
5944 | + | |
2cbb1c4b | 5945 | + err = vfsub_name_hash(name->name, &h_nd.last, name->len); |
1facf9fc | 5946 | + h_dentry = ERR_PTR(err); |
5947 | + if (!err) { | |
5948 | + path_get(&h_nd.path); | |
5949 | + h_dentry = vfsub_lookup_hash(&h_nd); | |
5950 | + path_put(&h_nd.path); | |
5951 | + } | |
5952 | + | |
4a4d8108 | 5953 | + AuTraceErrPtr(h_dentry); |
1facf9fc | 5954 | + return h_dentry; |
5955 | +} | |
5956 | + | |
5957 | +static void au_call_lkup_one(void *args) | |
5958 | +{ | |
5959 | + struct au_lkup_one_args *a = args; | |
5960 | + *a->errp = au_lkup_one(a->name, a->h_parent, a->br, a->nd); | |
5961 | +} | |
5962 | + | |
5963 | +#define AuLkup_ALLOW_NEG 1 | |
5964 | +#define au_ftest_lkup(flags, name) ((flags) & AuLkup_##name) | |
7f207e10 AM |
5965 | +#define au_fset_lkup(flags, name) \ |
5966 | + do { (flags) |= AuLkup_##name; } while (0) | |
5967 | +#define au_fclr_lkup(flags, name) \ | |
5968 | + do { (flags) &= ~AuLkup_##name; } while (0) | |
1facf9fc | 5969 | + |
5970 | +struct au_do_lookup_args { | |
5971 | + unsigned int flags; | |
5972 | + mode_t type; | |
5973 | + struct nameidata *nd; | |
5974 | +}; | |
5975 | + | |
5976 | +/* | |
5977 | + * returns positive/negative dentry, NULL or an error. | |
5978 | + * NULL means whiteout-ed or not-found. | |
5979 | + */ | |
5980 | +static struct dentry* | |
5981 | +au_do_lookup(struct dentry *h_parent, struct dentry *dentry, | |
5982 | + aufs_bindex_t bindex, struct qstr *wh_name, | |
5983 | + struct au_do_lookup_args *args) | |
5984 | +{ | |
5985 | + struct dentry *h_dentry; | |
5986 | + struct inode *h_inode, *inode; | |
1facf9fc | 5987 | + struct au_branch *br; |
5988 | + int wh_found, opq; | |
5989 | + unsigned char wh_able; | |
5990 | + const unsigned char allow_neg = !!au_ftest_lkup(args->flags, ALLOW_NEG); | |
5991 | + | |
1facf9fc | 5992 | + wh_found = 0; |
5993 | + br = au_sbr(dentry->d_sb, bindex); | |
5994 | + wh_able = !!au_br_whable(br->br_perm); | |
5995 | + if (wh_able) | |
5996 | + wh_found = au_wh_test(h_parent, wh_name, br, /*try_sio*/0); | |
5997 | + h_dentry = ERR_PTR(wh_found); | |
5998 | + if (!wh_found) | |
5999 | + goto real_lookup; | |
6000 | + if (unlikely(wh_found < 0)) | |
6001 | + goto out; | |
6002 | + | |
6003 | + /* We found a whiteout */ | |
6004 | + /* au_set_dbend(dentry, bindex); */ | |
6005 | + au_set_dbwh(dentry, bindex); | |
6006 | + if (!allow_neg) | |
6007 | + return NULL; /* success */ | |
6008 | + | |
4f0767ce | 6009 | +real_lookup: |
4a4d8108 | 6010 | + h_dentry = au_lkup_one(&dentry->d_name, h_parent, br, args->nd); |
1facf9fc | 6011 | + if (IS_ERR(h_dentry)) |
6012 | + goto out; | |
6013 | + | |
6014 | + h_inode = h_dentry->d_inode; | |
6015 | + if (!h_inode) { | |
6016 | + if (!allow_neg) | |
6017 | + goto out_neg; | |
6018 | + } else if (wh_found | |
6019 | + || (args->type && args->type != (h_inode->i_mode & S_IFMT))) | |
6020 | + goto out_neg; | |
6021 | + | |
6022 | + if (au_dbend(dentry) <= bindex) | |
6023 | + au_set_dbend(dentry, bindex); | |
6024 | + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry)) | |
6025 | + au_set_dbstart(dentry, bindex); | |
6026 | + au_set_h_dptr(dentry, bindex, h_dentry); | |
6027 | + | |
6028 | + inode = dentry->d_inode; | |
6029 | + if (!h_inode || !S_ISDIR(h_inode->i_mode) || !wh_able | |
6030 | + || (inode && !S_ISDIR(inode->i_mode))) | |
6031 | + goto out; /* success */ | |
6032 | + | |
6033 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
6034 | + opq = au_diropq_test(h_dentry, br); | |
6035 | + mutex_unlock(&h_inode->i_mutex); | |
6036 | + if (opq > 0) | |
6037 | + au_set_dbdiropq(dentry, bindex); | |
6038 | + else if (unlikely(opq < 0)) { | |
6039 | + au_set_h_dptr(dentry, bindex, NULL); | |
6040 | + h_dentry = ERR_PTR(opq); | |
6041 | + } | |
6042 | + goto out; | |
6043 | + | |
4f0767ce | 6044 | +out_neg: |
1facf9fc | 6045 | + dput(h_dentry); |
6046 | + h_dentry = NULL; | |
4f0767ce | 6047 | +out: |
1facf9fc | 6048 | + return h_dentry; |
6049 | +} | |
6050 | + | |
dece6358 AM |
6051 | +static int au_test_shwh(struct super_block *sb, const struct qstr *name) |
6052 | +{ | |
6053 | + if (unlikely(!au_opt_test(au_mntflags(sb), SHWH) | |
6054 | + && !strncmp(name->name, AUFS_WH_PFX, AUFS_WH_PFX_LEN))) | |
6055 | + return -EPERM; | |
6056 | + return 0; | |
6057 | +} | |
6058 | + | |
1facf9fc | 6059 | +/* |
6060 | + * returns the number of lower positive dentries, | |
6061 | + * otherwise an error. | |
6062 | + * can be called at unlinking with @type is zero. | |
6063 | + */ | |
6064 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type, | |
6065 | + struct nameidata *nd) | |
6066 | +{ | |
6067 | + int npositive, err; | |
6068 | + aufs_bindex_t bindex, btail, bdiropq; | |
6069 | + unsigned char isdir; | |
6070 | + struct qstr whname; | |
6071 | + struct au_do_lookup_args args = { | |
6072 | + .flags = 0, | |
6073 | + .type = type, | |
6074 | + .nd = nd | |
6075 | + }; | |
6076 | + const struct qstr *name = &dentry->d_name; | |
6077 | + struct dentry *parent; | |
6078 | + struct inode *inode; | |
6079 | + | |
dece6358 AM |
6080 | + err = au_test_shwh(dentry->d_sb, name); |
6081 | + if (unlikely(err)) | |
1facf9fc | 6082 | + goto out; |
6083 | + | |
6084 | + err = au_wh_name_alloc(&whname, name); | |
6085 | + if (unlikely(err)) | |
6086 | + goto out; | |
6087 | + | |
6088 | + inode = dentry->d_inode; | |
6089 | + isdir = !!(inode && S_ISDIR(inode->i_mode)); | |
6090 | + if (!type) | |
6091 | + au_fset_lkup(args.flags, ALLOW_NEG); | |
6092 | + | |
6093 | + npositive = 0; | |
4a4d8108 | 6094 | + parent = dget_parent(dentry); |
1facf9fc | 6095 | + btail = au_dbtaildir(parent); |
6096 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
6097 | + struct dentry *h_parent, *h_dentry; | |
6098 | + struct inode *h_inode, *h_dir; | |
6099 | + | |
6100 | + h_dentry = au_h_dptr(dentry, bindex); | |
6101 | + if (h_dentry) { | |
6102 | + if (h_dentry->d_inode) | |
6103 | + npositive++; | |
6104 | + if (type != S_IFDIR) | |
6105 | + break; | |
6106 | + continue; | |
6107 | + } | |
6108 | + h_parent = au_h_dptr(parent, bindex); | |
6109 | + if (!h_parent) | |
6110 | + continue; | |
6111 | + h_dir = h_parent->d_inode; | |
6112 | + if (!h_dir || !S_ISDIR(h_dir->i_mode)) | |
6113 | + continue; | |
6114 | + | |
6115 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
6116 | + h_dentry = au_do_lookup(h_parent, dentry, bindex, &whname, | |
6117 | + &args); | |
6118 | + mutex_unlock(&h_dir->i_mutex); | |
6119 | + err = PTR_ERR(h_dentry); | |
6120 | + if (IS_ERR(h_dentry)) | |
4a4d8108 | 6121 | + goto out_parent; |
1facf9fc | 6122 | + au_fclr_lkup(args.flags, ALLOW_NEG); |
6123 | + | |
6124 | + if (au_dbwh(dentry) >= 0) | |
6125 | + break; | |
6126 | + if (!h_dentry) | |
6127 | + continue; | |
6128 | + h_inode = h_dentry->d_inode; | |
6129 | + if (!h_inode) | |
6130 | + continue; | |
6131 | + npositive++; | |
6132 | + if (!args.type) | |
6133 | + args.type = h_inode->i_mode & S_IFMT; | |
6134 | + if (args.type != S_IFDIR) | |
6135 | + break; | |
6136 | + else if (isdir) { | |
6137 | + /* the type of lower may be different */ | |
6138 | + bdiropq = au_dbdiropq(dentry); | |
6139 | + if (bdiropq >= 0 && bdiropq <= bindex) | |
6140 | + break; | |
6141 | + } | |
6142 | + } | |
6143 | + | |
6144 | + if (npositive) { | |
6145 | + AuLabel(positive); | |
6146 | + au_update_dbstart(dentry); | |
6147 | + } | |
6148 | + err = npositive; | |
6149 | + if (unlikely(!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
027c5e7a | 6150 | + && au_dbstart(dentry) < 0)) { |
1facf9fc | 6151 | + err = -EIO; |
027c5e7a AM |
6152 | + AuIOErr("both of real entry and whiteout found, %.*s, err %d\n", |
6153 | + AuDLNPair(dentry), err); | |
6154 | + } | |
1facf9fc | 6155 | + |
4f0767ce | 6156 | +out_parent: |
4a4d8108 | 6157 | + dput(parent); |
1facf9fc | 6158 | + kfree(whname.name); |
4f0767ce | 6159 | +out: |
1facf9fc | 6160 | + return err; |
6161 | +} | |
6162 | + | |
6163 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent, | |
6164 | + struct au_branch *br) | |
6165 | +{ | |
6166 | + struct dentry *dentry; | |
6167 | + int wkq_err; | |
6168 | + | |
6169 | + if (!au_test_h_perm_sio(parent->d_inode, MAY_EXEC)) | |
6170 | + dentry = au_lkup_one(name, parent, br, /*nd*/NULL); | |
6171 | + else { | |
6172 | + struct au_lkup_one_args args = { | |
6173 | + .errp = &dentry, | |
6174 | + .name = name, | |
6175 | + .h_parent = parent, | |
6176 | + .br = br, | |
6177 | + .nd = NULL | |
6178 | + }; | |
6179 | + | |
6180 | + wkq_err = au_wkq_wait(au_call_lkup_one, &args); | |
6181 | + if (unlikely(wkq_err)) | |
6182 | + dentry = ERR_PTR(wkq_err); | |
6183 | + } | |
6184 | + | |
6185 | + return dentry; | |
6186 | +} | |
6187 | + | |
6188 | +/* | |
6189 | + * lookup @dentry on @bindex which should be negative. | |
6190 | + */ | |
6191 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex) | |
6192 | +{ | |
6193 | + int err; | |
6194 | + struct dentry *parent, *h_parent, *h_dentry; | |
1facf9fc | 6195 | + |
1facf9fc | 6196 | + parent = dget_parent(dentry); |
6197 | + h_parent = au_h_dptr(parent, bindex); | |
4a4d8108 | 6198 | + h_dentry = au_sio_lkup_one(&dentry->d_name, h_parent, |
1facf9fc | 6199 | + au_sbr(dentry->d_sb, bindex)); |
6200 | + err = PTR_ERR(h_dentry); | |
6201 | + if (IS_ERR(h_dentry)) | |
6202 | + goto out; | |
6203 | + if (unlikely(h_dentry->d_inode)) { | |
6204 | + err = -EIO; | |
027c5e7a AM |
6205 | + AuIOErr("%.*s should be negative on b%d.\n", |
6206 | + AuDLNPair(h_dentry), bindex); | |
1facf9fc | 6207 | + dput(h_dentry); |
6208 | + goto out; | |
6209 | + } | |
6210 | + | |
4a4d8108 | 6211 | + err = 0; |
1facf9fc | 6212 | + if (bindex < au_dbstart(dentry)) |
6213 | + au_set_dbstart(dentry, bindex); | |
6214 | + if (au_dbend(dentry) < bindex) | |
6215 | + au_set_dbend(dentry, bindex); | |
6216 | + au_set_h_dptr(dentry, bindex, h_dentry); | |
1facf9fc | 6217 | + |
4f0767ce | 6218 | +out: |
1facf9fc | 6219 | + dput(parent); |
6220 | + return err; | |
6221 | +} | |
6222 | + | |
6223 | +/* ---------------------------------------------------------------------- */ | |
6224 | + | |
6225 | +/* subset of struct inode */ | |
6226 | +struct au_iattr { | |
6227 | + unsigned long i_ino; | |
6228 | + /* unsigned int i_nlink; */ | |
6229 | + uid_t i_uid; | |
6230 | + gid_t i_gid; | |
6231 | + u64 i_version; | |
6232 | +/* | |
6233 | + loff_t i_size; | |
6234 | + blkcnt_t i_blocks; | |
6235 | +*/ | |
6236 | + umode_t i_mode; | |
6237 | +}; | |
6238 | + | |
6239 | +static void au_iattr_save(struct au_iattr *ia, struct inode *h_inode) | |
6240 | +{ | |
6241 | + ia->i_ino = h_inode->i_ino; | |
6242 | + /* ia->i_nlink = h_inode->i_nlink; */ | |
6243 | + ia->i_uid = h_inode->i_uid; | |
6244 | + ia->i_gid = h_inode->i_gid; | |
6245 | + ia->i_version = h_inode->i_version; | |
6246 | +/* | |
6247 | + ia->i_size = h_inode->i_size; | |
6248 | + ia->i_blocks = h_inode->i_blocks; | |
6249 | +*/ | |
6250 | + ia->i_mode = (h_inode->i_mode & S_IFMT); | |
6251 | +} | |
6252 | + | |
6253 | +static int au_iattr_test(struct au_iattr *ia, struct inode *h_inode) | |
6254 | +{ | |
6255 | + return ia->i_ino != h_inode->i_ino | |
6256 | + /* || ia->i_nlink != h_inode->i_nlink */ | |
6257 | + || ia->i_uid != h_inode->i_uid | |
6258 | + || ia->i_gid != h_inode->i_gid | |
6259 | + || ia->i_version != h_inode->i_version | |
6260 | +/* | |
6261 | + || ia->i_size != h_inode->i_size | |
6262 | + || ia->i_blocks != h_inode->i_blocks | |
6263 | +*/ | |
6264 | + || ia->i_mode != (h_inode->i_mode & S_IFMT); | |
6265 | +} | |
6266 | + | |
6267 | +static int au_h_verify_dentry(struct dentry *h_dentry, struct dentry *h_parent, | |
6268 | + struct au_branch *br) | |
6269 | +{ | |
6270 | + int err; | |
6271 | + struct au_iattr ia; | |
6272 | + struct inode *h_inode; | |
6273 | + struct dentry *h_d; | |
6274 | + struct super_block *h_sb; | |
6275 | + | |
6276 | + err = 0; | |
6277 | + memset(&ia, -1, sizeof(ia)); | |
6278 | + h_sb = h_dentry->d_sb; | |
6279 | + h_inode = h_dentry->d_inode; | |
6280 | + if (h_inode) | |
6281 | + au_iattr_save(&ia, h_inode); | |
6282 | + else if (au_test_nfs(h_sb) || au_test_fuse(h_sb)) | |
6283 | + /* nfs d_revalidate may return 0 for negative dentry */ | |
6284 | + /* fuse d_revalidate always return 0 for negative dentry */ | |
6285 | + goto out; | |
6286 | + | |
6287 | + /* main purpose is namei.c:cached_lookup() and d_revalidate */ | |
6288 | + h_d = au_lkup_one(&h_dentry->d_name, h_parent, br, /*nd*/NULL); | |
6289 | + err = PTR_ERR(h_d); | |
6290 | + if (IS_ERR(h_d)) | |
6291 | + goto out; | |
6292 | + | |
6293 | + err = 0; | |
6294 | + if (unlikely(h_d != h_dentry | |
6295 | + || h_d->d_inode != h_inode | |
6296 | + || (h_inode && au_iattr_test(&ia, h_inode)))) | |
6297 | + err = au_busy_or_stale(); | |
6298 | + dput(h_d); | |
6299 | + | |
4f0767ce | 6300 | +out: |
1facf9fc | 6301 | + AuTraceErr(err); |
6302 | + return err; | |
6303 | +} | |
6304 | + | |
6305 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
6306 | + struct dentry *h_parent, struct au_branch *br) | |
6307 | +{ | |
6308 | + int err; | |
6309 | + | |
6310 | + err = 0; | |
027c5e7a AM |
6311 | + if (udba == AuOpt_UDBA_REVAL |
6312 | + && !au_test_fs_remote(h_dentry->d_sb)) { | |
1facf9fc | 6313 | + IMustLock(h_dir); |
6314 | + err = (h_dentry->d_parent->d_inode != h_dir); | |
027c5e7a | 6315 | + } else if (udba != AuOpt_UDBA_NONE) |
1facf9fc | 6316 | + err = au_h_verify_dentry(h_dentry, h_parent, br); |
6317 | + | |
6318 | + return err; | |
6319 | +} | |
6320 | + | |
6321 | +/* ---------------------------------------------------------------------- */ | |
6322 | + | |
027c5e7a | 6323 | +static int au_do_refresh_hdentry(struct dentry *dentry, struct dentry *parent) |
1facf9fc | 6324 | +{ |
027c5e7a | 6325 | + int err; |
1facf9fc | 6326 | + aufs_bindex_t new_bindex, bindex, bend, bwh, bdiropq; |
027c5e7a AM |
6327 | + struct au_hdentry tmp, *p, *q; |
6328 | + struct au_dinfo *dinfo; | |
6329 | + struct super_block *sb; | |
1facf9fc | 6330 | + |
027c5e7a | 6331 | + DiMustWriteLock(dentry); |
1308ab2a | 6332 | + |
027c5e7a AM |
6333 | + sb = dentry->d_sb; |
6334 | + dinfo = au_di(dentry); | |
1facf9fc | 6335 | + bend = dinfo->di_bend; |
6336 | + bwh = dinfo->di_bwh; | |
6337 | + bdiropq = dinfo->di_bdiropq; | |
027c5e7a | 6338 | + p = dinfo->di_hdentry + dinfo->di_bstart; |
1facf9fc | 6339 | + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++, p++) { |
027c5e7a | 6340 | + if (!p->hd_dentry) |
1facf9fc | 6341 | + continue; |
6342 | + | |
027c5e7a AM |
6343 | + new_bindex = au_br_index(sb, p->hd_id); |
6344 | + if (new_bindex == bindex) | |
1facf9fc | 6345 | + continue; |
1facf9fc | 6346 | + |
1facf9fc | 6347 | + if (dinfo->di_bwh == bindex) |
6348 | + bwh = new_bindex; | |
6349 | + if (dinfo->di_bdiropq == bindex) | |
6350 | + bdiropq = new_bindex; | |
6351 | + if (new_bindex < 0) { | |
6352 | + au_hdput(p); | |
6353 | + p->hd_dentry = NULL; | |
6354 | + continue; | |
6355 | + } | |
6356 | + | |
6357 | + /* swap two lower dentries, and loop again */ | |
6358 | + q = dinfo->di_hdentry + new_bindex; | |
6359 | + tmp = *q; | |
6360 | + *q = *p; | |
6361 | + *p = tmp; | |
6362 | + if (tmp.hd_dentry) { | |
6363 | + bindex--; | |
6364 | + p--; | |
6365 | + } | |
6366 | + } | |
6367 | + | |
1facf9fc | 6368 | + dinfo->di_bwh = -1; |
6369 | + if (bwh >= 0 && bwh <= au_sbend(sb) && au_sbr_whable(sb, bwh)) | |
6370 | + dinfo->di_bwh = bwh; | |
6371 | + | |
6372 | + dinfo->di_bdiropq = -1; | |
6373 | + if (bdiropq >= 0 | |
6374 | + && bdiropq <= au_sbend(sb) | |
6375 | + && au_sbr_whable(sb, bdiropq)) | |
6376 | + dinfo->di_bdiropq = bdiropq; | |
6377 | + | |
027c5e7a AM |
6378 | + err = -EIO; |
6379 | + dinfo->di_bstart = -1; | |
6380 | + dinfo->di_bend = -1; | |
1facf9fc | 6381 | + bend = au_dbend(parent); |
6382 | + p = dinfo->di_hdentry; | |
6383 | + for (bindex = 0; bindex <= bend; bindex++, p++) | |
6384 | + if (p->hd_dentry) { | |
6385 | + dinfo->di_bstart = bindex; | |
6386 | + break; | |
6387 | + } | |
6388 | + | |
027c5e7a AM |
6389 | + if (dinfo->di_bstart >= 0) { |
6390 | + p = dinfo->di_hdentry + bend; | |
6391 | + for (bindex = bend; bindex >= 0; bindex--, p--) | |
6392 | + if (p->hd_dentry) { | |
6393 | + dinfo->di_bend = bindex; | |
6394 | + err = 0; | |
6395 | + break; | |
6396 | + } | |
6397 | + } | |
6398 | + | |
6399 | + return err; | |
1facf9fc | 6400 | +} |
6401 | + | |
027c5e7a | 6402 | +static void au_do_hide(struct dentry *dentry) |
1facf9fc | 6403 | +{ |
027c5e7a | 6404 | + struct inode *inode; |
1facf9fc | 6405 | + |
027c5e7a AM |
6406 | + inode = dentry->d_inode; |
6407 | + if (inode) { | |
6408 | + if (!S_ISDIR(inode->i_mode)) { | |
6409 | + if (inode->i_nlink && !d_unhashed(dentry)) | |
6410 | + drop_nlink(inode); | |
6411 | + } else { | |
6412 | + clear_nlink(inode); | |
6413 | + /* stop next lookup */ | |
6414 | + inode->i_flags |= S_DEAD; | |
6415 | + } | |
6416 | + smp_mb(); /* necessary? */ | |
6417 | + } | |
6418 | + d_drop(dentry); | |
6419 | +} | |
1308ab2a | 6420 | + |
027c5e7a AM |
6421 | +static int au_hide_children(struct dentry *parent) |
6422 | +{ | |
6423 | + int err, i, j, ndentry; | |
6424 | + struct au_dcsub_pages dpages; | |
6425 | + struct au_dpage *dpage; | |
6426 | + struct dentry *dentry; | |
1facf9fc | 6427 | + |
027c5e7a | 6428 | + err = au_dpages_init(&dpages, GFP_NOFS); |
1facf9fc | 6429 | + if (unlikely(err)) |
6430 | + goto out; | |
027c5e7a AM |
6431 | + err = au_dcsub_pages(&dpages, parent, NULL, NULL); |
6432 | + if (unlikely(err)) | |
6433 | + goto out_dpages; | |
1facf9fc | 6434 | + |
027c5e7a AM |
6435 | + /* in reverse order */ |
6436 | + for (i = dpages.ndpage - 1; i >= 0; i--) { | |
6437 | + dpage = dpages.dpages + i; | |
6438 | + ndentry = dpage->ndentry; | |
6439 | + for (j = ndentry - 1; j >= 0; j--) { | |
6440 | + dentry = dpage->dentries[j]; | |
6441 | + if (dentry != parent) | |
6442 | + au_do_hide(dentry); | |
6443 | + } | |
6444 | + } | |
1facf9fc | 6445 | + |
027c5e7a AM |
6446 | +out_dpages: |
6447 | + au_dpages_free(&dpages); | |
4f0767ce | 6448 | +out: |
027c5e7a | 6449 | + return err; |
1facf9fc | 6450 | +} |
6451 | + | |
027c5e7a | 6452 | +static void au_hide(struct dentry *dentry) |
1facf9fc | 6453 | +{ |
027c5e7a AM |
6454 | + int err; |
6455 | + struct inode *inode; | |
1facf9fc | 6456 | + |
027c5e7a AM |
6457 | + AuDbgDentry(dentry); |
6458 | + inode = dentry->d_inode; | |
6459 | + if (inode && S_ISDIR(inode->i_mode)) { | |
6460 | + /* shrink_dcache_parent(dentry); */ | |
6461 | + err = au_hide_children(dentry); | |
6462 | + if (unlikely(err)) | |
6463 | + AuIOErr("%.*s, failed hiding children, ignored %d\n", | |
6464 | + AuDLNPair(dentry), err); | |
6465 | + } | |
6466 | + au_do_hide(dentry); | |
6467 | +} | |
1facf9fc | 6468 | + |
027c5e7a AM |
6469 | +/* |
6470 | + * By adding a dirty branch, a cached dentry may be affected in various ways. | |
6471 | + * | |
6472 | + * a dirty branch is added | |
6473 | + * - on the top of layers | |
6474 | + * - in the middle of layers | |
6475 | + * - to the bottom of layers | |
6476 | + * | |
6477 | + * on the added branch there exists | |
6478 | + * - a whiteout | |
6479 | + * - a diropq | |
6480 | + * - a same named entry | |
6481 | + * + exist | |
6482 | + * * negative --> positive | |
6483 | + * * positive --> positive | |
6484 | + * - type is unchanged | |
6485 | + * - type is changed | |
6486 | + * + doesn't exist | |
6487 | + * * negative --> negative | |
6488 | + * * positive --> negative (rejected by au_br_del() for non-dir case) | |
6489 | + * - none | |
6490 | + */ | |
6491 | +static int au_refresh_by_dinfo(struct dentry *dentry, struct au_dinfo *dinfo, | |
6492 | + struct au_dinfo *tmp) | |
6493 | +{ | |
6494 | + int err; | |
6495 | + aufs_bindex_t bindex, bend; | |
6496 | + struct { | |
6497 | + struct dentry *dentry; | |
6498 | + struct inode *inode; | |
6499 | + mode_t mode; | |
6500 | + } orig_h, tmp_h; | |
6501 | + struct au_hdentry *hd; | |
6502 | + struct inode *inode, *h_inode; | |
6503 | + struct dentry *h_dentry; | |
6504 | + | |
6505 | + err = 0; | |
6506 | + AuDebugOn(dinfo->di_bstart < 0); | |
6507 | + orig_h.dentry = dinfo->di_hdentry[dinfo->di_bstart].hd_dentry; | |
6508 | + orig_h.inode = orig_h.dentry->d_inode; | |
6509 | + orig_h.mode = 0; | |
6510 | + if (orig_h.inode) | |
6511 | + orig_h.mode = orig_h.inode->i_mode & S_IFMT; | |
6512 | + memset(&tmp_h, 0, sizeof(tmp_h)); | |
6513 | + if (tmp->di_bstart >= 0) { | |
6514 | + tmp_h.dentry = tmp->di_hdentry[tmp->di_bstart].hd_dentry; | |
6515 | + tmp_h.inode = tmp_h.dentry->d_inode; | |
6516 | + if (tmp_h.inode) | |
6517 | + tmp_h.mode = tmp_h.inode->i_mode & S_IFMT; | |
6518 | + } | |
6519 | + | |
6520 | + inode = dentry->d_inode; | |
6521 | + if (!orig_h.inode) { | |
6522 | + AuDbg("nagative originally\n"); | |
6523 | + if (inode) { | |
6524 | + au_hide(dentry); | |
6525 | + goto out; | |
6526 | + } | |
6527 | + AuDebugOn(inode); | |
6528 | + AuDebugOn(dinfo->di_bstart != dinfo->di_bend); | |
6529 | + AuDebugOn(dinfo->di_bdiropq != -1); | |
6530 | + | |
6531 | + if (!tmp_h.inode) { | |
6532 | + AuDbg("negative --> negative\n"); | |
6533 | + /* should have only one negative lower */ | |
6534 | + if (tmp->di_bstart >= 0 | |
6535 | + && tmp->di_bstart < dinfo->di_bstart) { | |
6536 | + AuDebugOn(tmp->di_bstart != tmp->di_bend); | |
6537 | + AuDebugOn(dinfo->di_bstart != dinfo->di_bend); | |
6538 | + au_set_h_dptr(dentry, dinfo->di_bstart, NULL); | |
6539 | + au_di_cp(dinfo, tmp); | |
6540 | + hd = tmp->di_hdentry + tmp->di_bstart; | |
6541 | + au_set_h_dptr(dentry, tmp->di_bstart, | |
6542 | + dget(hd->hd_dentry)); | |
6543 | + } | |
6544 | + au_dbg_verify_dinode(dentry); | |
6545 | + } else { | |
6546 | + AuDbg("negative --> positive\n"); | |
6547 | + /* | |
6548 | + * similar to the behaviour of creating with bypassing | |
6549 | + * aufs. | |
6550 | + * unhash it in order to force an error in the | |
6551 | + * succeeding create operation. | |
6552 | + * we should not set S_DEAD here. | |
6553 | + */ | |
6554 | + d_drop(dentry); | |
6555 | + /* au_di_swap(tmp, dinfo); */ | |
6556 | + au_dbg_verify_dinode(dentry); | |
6557 | + } | |
6558 | + } else { | |
6559 | + AuDbg("positive originally\n"); | |
6560 | + /* inode may be NULL */ | |
6561 | + AuDebugOn(inode && (inode->i_mode & S_IFMT) != orig_h.mode); | |
6562 | + if (!tmp_h.inode) { | |
6563 | + AuDbg("positive --> negative\n"); | |
6564 | + /* or bypassing aufs */ | |
6565 | + au_hide(dentry); | |
6566 | + if (tmp->di_bwh >= 0 && tmp->di_bwh <= dinfo->di_bstart) | |
6567 | + dinfo->di_bwh = tmp->di_bwh; | |
6568 | + if (inode) | |
6569 | + err = au_refresh_hinode_self(inode); | |
6570 | + au_dbg_verify_dinode(dentry); | |
6571 | + } else if (orig_h.mode == tmp_h.mode) { | |
6572 | + AuDbg("positive --> positive, same type\n"); | |
6573 | + if (!S_ISDIR(orig_h.mode) | |
6574 | + && dinfo->di_bstart > tmp->di_bstart) { | |
6575 | + /* | |
6576 | + * similar to the behaviour of removing and | |
6577 | + * creating. | |
6578 | + */ | |
6579 | + au_hide(dentry); | |
6580 | + if (inode) | |
6581 | + err = au_refresh_hinode_self(inode); | |
6582 | + au_dbg_verify_dinode(dentry); | |
6583 | + } else { | |
6584 | + /* fill empty slots */ | |
6585 | + if (dinfo->di_bstart > tmp->di_bstart) | |
6586 | + dinfo->di_bstart = tmp->di_bstart; | |
6587 | + if (dinfo->di_bend < tmp->di_bend) | |
6588 | + dinfo->di_bend = tmp->di_bend; | |
6589 | + dinfo->di_bwh = tmp->di_bwh; | |
6590 | + dinfo->di_bdiropq = tmp->di_bdiropq; | |
6591 | + hd = tmp->di_hdentry; | |
6592 | + bend = dinfo->di_bend; | |
6593 | + for (bindex = tmp->di_bstart; bindex <= bend; | |
6594 | + bindex++) { | |
6595 | + if (au_h_dptr(dentry, bindex)) | |
6596 | + continue; | |
6597 | + h_dentry = hd[bindex].hd_dentry; | |
6598 | + if (!h_dentry) | |
6599 | + continue; | |
6600 | + h_inode = h_dentry->d_inode; | |
6601 | + AuDebugOn(!h_inode); | |
6602 | + AuDebugOn(orig_h.mode | |
6603 | + != (h_inode->i_mode | |
6604 | + & S_IFMT)); | |
6605 | + au_set_h_dptr(dentry, bindex, | |
6606 | + dget(h_dentry)); | |
6607 | + } | |
6608 | + err = au_refresh_hinode(inode, dentry); | |
6609 | + au_dbg_verify_dinode(dentry); | |
6610 | + } | |
6611 | + } else { | |
6612 | + AuDbg("positive --> positive, different type\n"); | |
6613 | + /* similar to the behaviour of removing and creating */ | |
6614 | + au_hide(dentry); | |
6615 | + if (inode) | |
6616 | + err = au_refresh_hinode_self(inode); | |
6617 | + au_dbg_verify_dinode(dentry); | |
6618 | + } | |
6619 | + } | |
6620 | + | |
6621 | +out: | |
6622 | + return err; | |
6623 | +} | |
6624 | + | |
6625 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent) | |
6626 | +{ | |
6627 | + int err, ebrange; | |
6628 | + unsigned int sigen; | |
6629 | + struct au_dinfo *dinfo, *tmp; | |
6630 | + struct super_block *sb; | |
6631 | + struct inode *inode; | |
6632 | + | |
6633 | + DiMustWriteLock(dentry); | |
6634 | + AuDebugOn(IS_ROOT(dentry)); | |
6635 | + AuDebugOn(!parent->d_inode); | |
6636 | + | |
6637 | + sb = dentry->d_sb; | |
6638 | + inode = dentry->d_inode; | |
6639 | + sigen = au_sigen(sb); | |
6640 | + err = au_digen_test(parent, sigen); | |
6641 | + if (unlikely(err)) | |
6642 | + goto out; | |
6643 | + | |
6644 | + dinfo = au_di(dentry); | |
6645 | + err = au_di_realloc(dinfo, au_sbend(sb) + 1); | |
6646 | + if (unlikely(err)) | |
6647 | + goto out; | |
6648 | + ebrange = au_dbrange_test(dentry); | |
6649 | + if (!ebrange) | |
6650 | + ebrange = au_do_refresh_hdentry(dentry, parent); | |
6651 | + | |
6652 | + if (d_unhashed(dentry) || ebrange) { | |
6653 | + AuDebugOn(au_dbstart(dentry) < 0 && au_dbend(dentry) >= 0); | |
6654 | + if (inode) | |
6655 | + err = au_refresh_hinode_self(inode); | |
6656 | + au_dbg_verify_dinode(dentry); | |
6657 | + if (!err) | |
6658 | + goto out_dgen; /* success */ | |
6659 | + goto out; | |
6660 | + } | |
6661 | + | |
6662 | + /* temporary dinfo */ | |
6663 | + AuDbgDentry(dentry); | |
6664 | + err = -ENOMEM; | |
6665 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
6666 | + if (unlikely(!tmp)) | |
6667 | + goto out; | |
6668 | + au_di_swap(tmp, dinfo); | |
6669 | + /* returns the number of positive dentries */ | |
6670 | + /* | |
6671 | + * if current working dir is removed, it returns an error. | |
6672 | + * but the dentry is legal. | |
6673 | + */ | |
6674 | + err = au_lkup_dentry(dentry, /*bstart*/0, /*type*/0, /*nd*/NULL); | |
6675 | + AuDbgDentry(dentry); | |
6676 | + au_di_swap(tmp, dinfo); | |
6677 | + if (err == -ENOENT) | |
6678 | + err = 0; | |
6679 | + if (err >= 0) { | |
6680 | + /* compare/refresh by dinfo */ | |
6681 | + AuDbgDentry(dentry); | |
6682 | + err = au_refresh_by_dinfo(dentry, dinfo, tmp); | |
6683 | + au_dbg_verify_dinode(dentry); | |
6684 | + AuTraceErr(err); | |
6685 | + } | |
6686 | + au_rw_write_unlock(&tmp->di_rwsem); | |
6687 | + au_di_free(tmp); | |
6688 | + if (unlikely(err)) | |
6689 | + goto out; | |
6690 | + | |
6691 | +out_dgen: | |
6692 | + au_update_digen(dentry); | |
6693 | +out: | |
6694 | + if (unlikely(err && !(dentry->d_flags & DCACHE_NFSFS_RENAMED))) { | |
6695 | + AuIOErr("failed refreshing %.*s, %d\n", | |
6696 | + AuDLNPair(dentry), err); | |
6697 | + AuDbgDentry(dentry); | |
6698 | + } | |
6699 | + AuTraceErr(err); | |
6700 | + return err; | |
6701 | +} | |
6702 | + | |
6703 | +static noinline_for_stack | |
6704 | +int au_do_h_d_reval(struct dentry *h_dentry, struct nameidata *nd, | |
6705 | + struct dentry *dentry, aufs_bindex_t bindex) | |
6706 | +{ | |
6707 | + int err, valid; | |
6708 | + int (*reval)(struct dentry *, struct nameidata *); | |
6709 | + | |
6710 | + err = 0; | |
6711 | + if (!(h_dentry->d_flags & DCACHE_OP_REVALIDATE)) | |
6712 | + goto out; | |
6713 | + reval = h_dentry->d_op->d_revalidate; | |
6714 | + | |
6715 | + AuDbg("b%d\n", bindex); | |
6716 | + if (au_test_fs_null_nd(h_dentry->d_sb)) | |
6717 | + /* it may return tri-state */ | |
6718 | + valid = reval(h_dentry, NULL); | |
6719 | + else { | |
6720 | + struct nameidata h_nd; | |
6721 | + int locked; | |
1facf9fc | 6722 | + struct dentry *parent; |
6723 | + | |
6724 | + au_h_nd(&h_nd, nd); | |
6725 | + parent = nd->path.dentry; | |
6726 | + locked = (nd && nd->path.dentry != dentry); | |
6727 | + if (locked) | |
6728 | + di_read_lock_parent(parent, AuLock_IR); | |
6729 | + BUG_ON(bindex > au_dbend(parent)); | |
6730 | + h_nd.path.dentry = au_h_dptr(parent, bindex); | |
6731 | + BUG_ON(!h_nd.path.dentry); | |
6732 | + h_nd.path.mnt = au_sbr(parent->d_sb, bindex)->br_mnt; | |
6733 | + path_get(&h_nd.path); | |
6734 | + valid = reval(h_dentry, &h_nd); | |
6735 | + path_put(&h_nd.path); | |
6736 | + if (locked) | |
6737 | + di_read_unlock(parent, AuLock_IR); | |
6738 | + } | |
6739 | + | |
6740 | + if (unlikely(valid < 0)) | |
6741 | + err = valid; | |
6742 | + else if (!valid) | |
6743 | + err = -EINVAL; | |
6744 | + | |
4f0767ce | 6745 | +out: |
1facf9fc | 6746 | + AuTraceErr(err); |
6747 | + return err; | |
6748 | +} | |
6749 | + | |
6750 | +/* todo: remove this */ | |
6751 | +static int h_d_revalidate(struct dentry *dentry, struct inode *inode, | |
6752 | + struct nameidata *nd, int do_udba) | |
6753 | +{ | |
6754 | + int err; | |
6755 | + umode_t mode, h_mode; | |
6756 | + aufs_bindex_t bindex, btail, bstart, ibs, ibe; | |
6757 | + unsigned char plus, unhashed, is_root, h_plus; | |
4a4d8108 | 6758 | + struct inode *h_inode, *h_cached_inode; |
1facf9fc | 6759 | + struct dentry *h_dentry; |
6760 | + struct qstr *name, *h_name; | |
6761 | + | |
6762 | + err = 0; | |
6763 | + plus = 0; | |
6764 | + mode = 0; | |
1facf9fc | 6765 | + ibs = -1; |
6766 | + ibe = -1; | |
6767 | + unhashed = !!d_unhashed(dentry); | |
6768 | + is_root = !!IS_ROOT(dentry); | |
6769 | + name = &dentry->d_name; | |
6770 | + | |
6771 | + /* | |
7f207e10 AM |
6772 | + * Theoretically, REVAL test should be unnecessary in case of |
6773 | + * {FS,I}NOTIFY. | |
6774 | + * But {fs,i}notify doesn't fire some necessary events, | |
1facf9fc | 6775 | + * IN_ATTRIB for atime/nlink/pageio |
6776 | + * IN_DELETE for NFS dentry | |
6777 | + * Let's do REVAL test too. | |
6778 | + */ | |
6779 | + if (do_udba && inode) { | |
6780 | + mode = (inode->i_mode & S_IFMT); | |
6781 | + plus = (inode->i_nlink > 0); | |
1facf9fc | 6782 | + ibs = au_ibstart(inode); |
6783 | + ibe = au_ibend(inode); | |
6784 | + } | |
6785 | + | |
6786 | + bstart = au_dbstart(dentry); | |
6787 | + btail = bstart; | |
6788 | + if (inode && S_ISDIR(inode->i_mode)) | |
6789 | + btail = au_dbtaildir(dentry); | |
6790 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
6791 | + h_dentry = au_h_dptr(dentry, bindex); | |
6792 | + if (!h_dentry) | |
6793 | + continue; | |
6794 | + | |
6795 | + AuDbg("b%d, %.*s\n", bindex, AuDLNPair(h_dentry)); | |
027c5e7a | 6796 | + spin_lock(&h_dentry->d_lock); |
1facf9fc | 6797 | + h_name = &h_dentry->d_name; |
6798 | + if (unlikely(do_udba | |
6799 | + && !is_root | |
6800 | + && (unhashed != !!d_unhashed(h_dentry) | |
6801 | + || name->len != h_name->len | |
6802 | + || memcmp(name->name, h_name->name, name->len)) | |
6803 | + )) { | |
6804 | + AuDbg("unhash 0x%x 0x%x, %.*s %.*s\n", | |
6805 | + unhashed, d_unhashed(h_dentry), | |
6806 | + AuDLNPair(dentry), AuDLNPair(h_dentry)); | |
027c5e7a | 6807 | + spin_unlock(&h_dentry->d_lock); |
1facf9fc | 6808 | + goto err; |
6809 | + } | |
027c5e7a | 6810 | + spin_unlock(&h_dentry->d_lock); |
1facf9fc | 6811 | + |
6812 | + err = au_do_h_d_reval(h_dentry, nd, dentry, bindex); | |
6813 | + if (unlikely(err)) | |
6814 | + /* do not goto err, to keep the errno */ | |
6815 | + break; | |
6816 | + | |
6817 | + /* todo: plink too? */ | |
6818 | + if (!do_udba) | |
6819 | + continue; | |
6820 | + | |
6821 | + /* UDBA tests */ | |
6822 | + h_inode = h_dentry->d_inode; | |
6823 | + if (unlikely(!!inode != !!h_inode)) | |
6824 | + goto err; | |
6825 | + | |
6826 | + h_plus = plus; | |
6827 | + h_mode = mode; | |
6828 | + h_cached_inode = h_inode; | |
6829 | + if (h_inode) { | |
6830 | + h_mode = (h_inode->i_mode & S_IFMT); | |
6831 | + h_plus = (h_inode->i_nlink > 0); | |
6832 | + } | |
6833 | + if (inode && ibs <= bindex && bindex <= ibe) | |
6834 | + h_cached_inode = au_h_iptr(inode, bindex); | |
6835 | + | |
6836 | + if (unlikely(plus != h_plus | |
6837 | + || mode != h_mode | |
6838 | + || h_cached_inode != h_inode)) | |
6839 | + goto err; | |
6840 | + continue; | |
6841 | + | |
6842 | + err: | |
6843 | + err = -EINVAL; | |
6844 | + break; | |
6845 | + } | |
6846 | + | |
6847 | + return err; | |
6848 | +} | |
6849 | + | |
027c5e7a | 6850 | +/* todo: consolidate with do_refresh() and au_reval_for_attr() */ |
1facf9fc | 6851 | +static int simple_reval_dpath(struct dentry *dentry, unsigned int sigen) |
6852 | +{ | |
6853 | + int err; | |
6854 | + struct dentry *parent; | |
1facf9fc | 6855 | + |
027c5e7a | 6856 | + if (!au_digen_test(dentry, sigen)) |
1facf9fc | 6857 | + return 0; |
6858 | + | |
6859 | + parent = dget_parent(dentry); | |
6860 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 6861 | + AuDebugOn(au_digen_test(parent, sigen)); |
1facf9fc | 6862 | + au_dbg_verify_gen(parent, sigen); |
027c5e7a | 6863 | + err = au_refresh_dentry(dentry, parent); |
1facf9fc | 6864 | + di_read_unlock(parent, AuLock_IR); |
6865 | + dput(parent); | |
027c5e7a | 6866 | + AuTraceErr(err); |
1facf9fc | 6867 | + return err; |
6868 | +} | |
6869 | + | |
6870 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen) | |
6871 | +{ | |
6872 | + int err; | |
6873 | + struct dentry *d, *parent; | |
6874 | + struct inode *inode; | |
6875 | + | |
027c5e7a | 6876 | + if (!au_ftest_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR)) |
1facf9fc | 6877 | + return simple_reval_dpath(dentry, sigen); |
6878 | + | |
6879 | + /* slow loop, keep it simple and stupid */ | |
6880 | + /* cf: au_cpup_dirs() */ | |
6881 | + err = 0; | |
6882 | + parent = NULL; | |
027c5e7a | 6883 | + while (au_digen_test(dentry, sigen)) { |
1facf9fc | 6884 | + d = dentry; |
6885 | + while (1) { | |
6886 | + dput(parent); | |
6887 | + parent = dget_parent(d); | |
027c5e7a | 6888 | + if (!au_digen_test(parent, sigen)) |
1facf9fc | 6889 | + break; |
6890 | + d = parent; | |
6891 | + } | |
6892 | + | |
6893 | + inode = d->d_inode; | |
6894 | + if (d != dentry) | |
027c5e7a | 6895 | + di_write_lock_child2(d); |
1facf9fc | 6896 | + |
6897 | + /* someone might update our dentry while we were sleeping */ | |
027c5e7a AM |
6898 | + if (au_digen_test(d, sigen)) { |
6899 | + /* | |
6900 | + * todo: consolidate with simple_reval_dpath(), | |
6901 | + * do_refresh() and au_reval_for_attr(). | |
6902 | + */ | |
1facf9fc | 6903 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a | 6904 | + err = au_refresh_dentry(d, parent); |
1facf9fc | 6905 | + di_read_unlock(parent, AuLock_IR); |
6906 | + } | |
6907 | + | |
6908 | + if (d != dentry) | |
6909 | + di_write_unlock(d); | |
6910 | + dput(parent); | |
6911 | + if (unlikely(err)) | |
6912 | + break; | |
6913 | + } | |
6914 | + | |
6915 | + return err; | |
6916 | +} | |
6917 | + | |
6918 | +/* | |
6919 | + * if valid returns 1, otherwise 0. | |
6920 | + */ | |
6921 | +static int aufs_d_revalidate(struct dentry *dentry, struct nameidata *nd) | |
6922 | +{ | |
6923 | + int valid, err; | |
6924 | + unsigned int sigen; | |
6925 | + unsigned char do_udba; | |
6926 | + struct super_block *sb; | |
6927 | + struct inode *inode; | |
6928 | + | |
027c5e7a AM |
6929 | + /* todo: support rcu-walk? */ |
6930 | + if (nd && (nd->flags & LOOKUP_RCU)) | |
6931 | + return -ECHILD; | |
6932 | + | |
6933 | + valid = 0; | |
6934 | + if (unlikely(!au_di(dentry))) | |
6935 | + goto out; | |
6936 | + | |
6937 | + inode = dentry->d_inode; | |
6938 | + if (inode && is_bad_inode(inode)) | |
6939 | + goto out; | |
6940 | + | |
e49829fe | 6941 | + valid = 1; |
1facf9fc | 6942 | + sb = dentry->d_sb; |
e49829fe JR |
6943 | + /* |
6944 | + * todo: very ugly | |
6945 | + * i_mutex of parent dir may be held, | |
6946 | + * but we should not return 'invalid' due to busy. | |
6947 | + */ | |
6948 | + err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_DW | AuLock_NOPLM); | |
6949 | + if (unlikely(err)) { | |
6950 | + valid = err; | |
027c5e7a | 6951 | + AuTraceErr(err); |
e49829fe JR |
6952 | + goto out; |
6953 | + } | |
027c5e7a AM |
6954 | + if (unlikely(au_dbrange_test(dentry))) { |
6955 | + err = -EINVAL; | |
6956 | + AuTraceErr(err); | |
6957 | + goto out_dgrade; | |
1facf9fc | 6958 | + } |
027c5e7a AM |
6959 | + |
6960 | + sigen = au_sigen(sb); | |
6961 | + if (au_digen_test(dentry, sigen)) { | |
1facf9fc | 6962 | + AuDebugOn(IS_ROOT(dentry)); |
027c5e7a AM |
6963 | + err = au_reval_dpath(dentry, sigen); |
6964 | + if (unlikely(err)) { | |
6965 | + AuTraceErr(err); | |
1facf9fc | 6966 | + goto out_dgrade; |
027c5e7a | 6967 | + } |
1facf9fc | 6968 | + } |
6969 | + di_downgrade_lock(dentry, AuLock_IR); | |
6970 | + | |
1facf9fc | 6971 | + err = -EINVAL; |
027c5e7a AM |
6972 | + if (inode && (IS_DEADDIR(inode) || !inode->i_nlink)) |
6973 | + goto out_inval; | |
6974 | + | |
1facf9fc | 6975 | + do_udba = !au_opt_test(au_mntflags(sb), UDBA_NONE); |
6976 | + if (do_udba && inode) { | |
6977 | + aufs_bindex_t bstart = au_ibstart(inode); | |
027c5e7a | 6978 | + struct inode *h_inode; |
1facf9fc | 6979 | + |
027c5e7a AM |
6980 | + if (bstart >= 0) { |
6981 | + h_inode = au_h_iptr(inode, bstart); | |
6982 | + if (h_inode && au_test_higen(inode, h_inode)) | |
6983 | + goto out_inval; | |
6984 | + } | |
1facf9fc | 6985 | + } |
6986 | + | |
6987 | + err = h_d_revalidate(dentry, inode, nd, do_udba); | |
027c5e7a | 6988 | + if (unlikely(!err && do_udba && au_dbstart(dentry) < 0)) { |
1facf9fc | 6989 | + err = -EIO; |
027c5e7a AM |
6990 | + AuDbg("both of real entry and whiteout found, %.*s, err %d\n", |
6991 | + AuDLNPair(dentry), err); | |
6992 | + } | |
e49829fe | 6993 | + goto out_inval; |
1facf9fc | 6994 | + |
4f0767ce | 6995 | +out_dgrade: |
1facf9fc | 6996 | + di_downgrade_lock(dentry, AuLock_IR); |
e49829fe | 6997 | +out_inval: |
1facf9fc | 6998 | + aufs_read_unlock(dentry, AuLock_IR); |
6999 | + AuTraceErr(err); | |
7000 | + valid = !err; | |
e49829fe | 7001 | +out: |
027c5e7a | 7002 | + if (!valid) { |
e49829fe | 7003 | + AuDbg("%.*s invalid, %d\n", AuDLNPair(dentry), valid); |
027c5e7a AM |
7004 | + d_drop(dentry); |
7005 | + } | |
1facf9fc | 7006 | + return valid; |
7007 | +} | |
7008 | + | |
7009 | +static void aufs_d_release(struct dentry *dentry) | |
7010 | +{ | |
027c5e7a | 7011 | + if (au_di(dentry)) { |
4a4d8108 AM |
7012 | + au_di_fin(dentry); |
7013 | + au_hn_di_reinit(dentry); | |
1facf9fc | 7014 | + } |
1facf9fc | 7015 | +} |
7016 | + | |
4a4d8108 | 7017 | +const struct dentry_operations aufs_dop = { |
1facf9fc | 7018 | + .d_revalidate = aufs_d_revalidate, |
7019 | + .d_release = aufs_d_release | |
7020 | +}; | |
7f207e10 AM |
7021 | diff -urN /usr/share/empty/fs/aufs/dentry.h linux/fs/aufs/dentry.h |
7022 | --- /usr/share/empty/fs/aufs/dentry.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 7023 | +++ linux/fs/aufs/dentry.h 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 7024 | @@ -0,0 +1,238 @@ |
1facf9fc | 7025 | +/* |
027c5e7a | 7026 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 7027 | + * |
7028 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7029 | + * it under the terms of the GNU General Public License as published by | |
7030 | + * the Free Software Foundation; either version 2 of the License, or | |
7031 | + * (at your option) any later version. | |
dece6358 AM |
7032 | + * |
7033 | + * This program is distributed in the hope that it will be useful, | |
7034 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7035 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7036 | + * GNU General Public License for more details. | |
7037 | + * | |
7038 | + * You should have received a copy of the GNU General Public License | |
7039 | + * along with this program; if not, write to the Free Software | |
7040 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 7041 | + */ |
7042 | + | |
7043 | +/* | |
7044 | + * lookup and dentry operations | |
7045 | + */ | |
7046 | + | |
7047 | +#ifndef __AUFS_DENTRY_H__ | |
7048 | +#define __AUFS_DENTRY_H__ | |
7049 | + | |
7050 | +#ifdef __KERNEL__ | |
7051 | + | |
dece6358 | 7052 | +#include <linux/dcache.h> |
1facf9fc | 7053 | +#include <linux/aufs_type.h> |
7054 | +#include "rwsem.h" | |
7055 | + | |
1facf9fc | 7056 | +struct au_hdentry { |
7057 | + struct dentry *hd_dentry; | |
027c5e7a | 7058 | + aufs_bindex_t hd_id; |
1facf9fc | 7059 | +}; |
7060 | + | |
7061 | +struct au_dinfo { | |
7062 | + atomic_t di_generation; | |
7063 | + | |
dece6358 | 7064 | + struct au_rwsem di_rwsem; |
1facf9fc | 7065 | + aufs_bindex_t di_bstart, di_bend, di_bwh, di_bdiropq; |
7066 | + struct au_hdentry *di_hdentry; | |
4a4d8108 | 7067 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 7068 | + |
7069 | +/* ---------------------------------------------------------------------- */ | |
7070 | + | |
7071 | +/* dentry.c */ | |
4a4d8108 | 7072 | +extern const struct dentry_operations aufs_dop; |
1facf9fc | 7073 | +struct au_branch; |
7074 | +struct dentry *au_lkup_one(struct qstr *name, struct dentry *h_parent, | |
7075 | + struct au_branch *br, struct nameidata *nd); | |
7076 | +struct dentry *au_sio_lkup_one(struct qstr *name, struct dentry *parent, | |
7077 | + struct au_branch *br); | |
7078 | +int au_h_verify(struct dentry *h_dentry, unsigned int udba, struct inode *h_dir, | |
7079 | + struct dentry *h_parent, struct au_branch *br); | |
7080 | + | |
7081 | +int au_lkup_dentry(struct dentry *dentry, aufs_bindex_t bstart, mode_t type, | |
7082 | + struct nameidata *nd); | |
7083 | +int au_lkup_neg(struct dentry *dentry, aufs_bindex_t bindex); | |
027c5e7a | 7084 | +int au_refresh_dentry(struct dentry *dentry, struct dentry *parent); |
1facf9fc | 7085 | +int au_reval_dpath(struct dentry *dentry, unsigned int sigen); |
7086 | + | |
7087 | +/* dinfo.c */ | |
4a4d8108 | 7088 | +void au_di_init_once(void *_di); |
027c5e7a AM |
7089 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc); |
7090 | +void au_di_free(struct au_dinfo *dinfo); | |
7091 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b); | |
7092 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src); | |
4a4d8108 AM |
7093 | +int au_di_init(struct dentry *dentry); |
7094 | +void au_di_fin(struct dentry *dentry); | |
1facf9fc | 7095 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr); |
7096 | + | |
7097 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc); | |
7098 | +void di_read_unlock(struct dentry *d, int flags); | |
7099 | +void di_downgrade_lock(struct dentry *d, int flags); | |
7100 | +void di_write_lock(struct dentry *d, unsigned int lsc); | |
7101 | +void di_write_unlock(struct dentry *d); | |
7102 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir); | |
7103 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir); | |
7104 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2); | |
7105 | + | |
7106 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex); | |
2cbb1c4b | 7107 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex); |
1facf9fc | 7108 | +aufs_bindex_t au_dbtail(struct dentry *dentry); |
7109 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry); | |
7110 | + | |
7111 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
7112 | + struct dentry *h_dentry); | |
027c5e7a AM |
7113 | +int au_digen_test(struct dentry *dentry, unsigned int sigen); |
7114 | +int au_dbrange_test(struct dentry *dentry); | |
1facf9fc | 7115 | +void au_update_digen(struct dentry *dentry); |
7116 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero); | |
7117 | +void au_update_dbstart(struct dentry *dentry); | |
7118 | +void au_update_dbend(struct dentry *dentry); | |
7119 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry); | |
7120 | + | |
7121 | +/* ---------------------------------------------------------------------- */ | |
7122 | + | |
7123 | +static inline struct au_dinfo *au_di(struct dentry *dentry) | |
7124 | +{ | |
7125 | + return dentry->d_fsdata; | |
7126 | +} | |
7127 | + | |
7128 | +/* ---------------------------------------------------------------------- */ | |
7129 | + | |
7130 | +/* lock subclass for dinfo */ | |
7131 | +enum { | |
7132 | + AuLsc_DI_CHILD, /* child first */ | |
4a4d8108 | 7133 | + AuLsc_DI_CHILD2, /* rename(2), link(2), and cpup at hnotify */ |
1facf9fc | 7134 | + AuLsc_DI_CHILD3, /* copyup dirs */ |
7135 | + AuLsc_DI_PARENT, | |
7136 | + AuLsc_DI_PARENT2, | |
027c5e7a AM |
7137 | + AuLsc_DI_PARENT3, |
7138 | + AuLsc_DI_TMP /* temp for replacing dinfo */ | |
1facf9fc | 7139 | +}; |
7140 | + | |
7141 | +/* | |
7142 | + * di_read_lock_child, di_write_lock_child, | |
7143 | + * di_read_lock_child2, di_write_lock_child2, | |
7144 | + * di_read_lock_child3, di_write_lock_child3, | |
7145 | + * di_read_lock_parent, di_write_lock_parent, | |
7146 | + * di_read_lock_parent2, di_write_lock_parent2, | |
7147 | + * di_read_lock_parent3, di_write_lock_parent3, | |
7148 | + */ | |
7149 | +#define AuReadLockFunc(name, lsc) \ | |
7150 | +static inline void di_read_lock_##name(struct dentry *d, int flags) \ | |
7151 | +{ di_read_lock(d, flags, AuLsc_DI_##lsc); } | |
7152 | + | |
7153 | +#define AuWriteLockFunc(name, lsc) \ | |
7154 | +static inline void di_write_lock_##name(struct dentry *d) \ | |
7155 | +{ di_write_lock(d, AuLsc_DI_##lsc); } | |
7156 | + | |
7157 | +#define AuRWLockFuncs(name, lsc) \ | |
7158 | + AuReadLockFunc(name, lsc) \ | |
7159 | + AuWriteLockFunc(name, lsc) | |
7160 | + | |
7161 | +AuRWLockFuncs(child, CHILD); | |
7162 | +AuRWLockFuncs(child2, CHILD2); | |
7163 | +AuRWLockFuncs(child3, CHILD3); | |
7164 | +AuRWLockFuncs(parent, PARENT); | |
7165 | +AuRWLockFuncs(parent2, PARENT2); | |
7166 | +AuRWLockFuncs(parent3, PARENT3); | |
7167 | + | |
7168 | +#undef AuReadLockFunc | |
7169 | +#undef AuWriteLockFunc | |
7170 | +#undef AuRWLockFuncs | |
7171 | + | |
7172 | +#define DiMustNoWaiters(d) AuRwMustNoWaiters(&au_di(d)->di_rwsem) | |
dece6358 AM |
7173 | +#define DiMustAnyLock(d) AuRwMustAnyLock(&au_di(d)->di_rwsem) |
7174 | +#define DiMustWriteLock(d) AuRwMustWriteLock(&au_di(d)->di_rwsem) | |
1facf9fc | 7175 | + |
7176 | +/* ---------------------------------------------------------------------- */ | |
7177 | + | |
7178 | +/* todo: memory barrier? */ | |
7179 | +static inline unsigned int au_digen(struct dentry *d) | |
7180 | +{ | |
7181 | + return atomic_read(&au_di(d)->di_generation); | |
7182 | +} | |
7183 | + | |
7184 | +static inline void au_h_dentry_init(struct au_hdentry *hdentry) | |
7185 | +{ | |
7186 | + hdentry->hd_dentry = NULL; | |
7187 | +} | |
7188 | + | |
7189 | +static inline void au_hdput(struct au_hdentry *hd) | |
7190 | +{ | |
4a4d8108 AM |
7191 | + if (hd) |
7192 | + dput(hd->hd_dentry); | |
1facf9fc | 7193 | +} |
7194 | + | |
7195 | +static inline aufs_bindex_t au_dbstart(struct dentry *dentry) | |
7196 | +{ | |
1308ab2a | 7197 | + DiMustAnyLock(dentry); |
1facf9fc | 7198 | + return au_di(dentry)->di_bstart; |
7199 | +} | |
7200 | + | |
7201 | +static inline aufs_bindex_t au_dbend(struct dentry *dentry) | |
7202 | +{ | |
1308ab2a | 7203 | + DiMustAnyLock(dentry); |
1facf9fc | 7204 | + return au_di(dentry)->di_bend; |
7205 | +} | |
7206 | + | |
7207 | +static inline aufs_bindex_t au_dbwh(struct dentry *dentry) | |
7208 | +{ | |
1308ab2a | 7209 | + DiMustAnyLock(dentry); |
1facf9fc | 7210 | + return au_di(dentry)->di_bwh; |
7211 | +} | |
7212 | + | |
7213 | +static inline aufs_bindex_t au_dbdiropq(struct dentry *dentry) | |
7214 | +{ | |
1308ab2a | 7215 | + DiMustAnyLock(dentry); |
1facf9fc | 7216 | + return au_di(dentry)->di_bdiropq; |
7217 | +} | |
7218 | + | |
7219 | +/* todo: hard/soft set? */ | |
7220 | +static inline void au_set_dbstart(struct dentry *dentry, aufs_bindex_t bindex) | |
7221 | +{ | |
1308ab2a | 7222 | + DiMustWriteLock(dentry); |
1facf9fc | 7223 | + au_di(dentry)->di_bstart = bindex; |
7224 | +} | |
7225 | + | |
7226 | +static inline void au_set_dbend(struct dentry *dentry, aufs_bindex_t bindex) | |
7227 | +{ | |
1308ab2a | 7228 | + DiMustWriteLock(dentry); |
1facf9fc | 7229 | + au_di(dentry)->di_bend = bindex; |
7230 | +} | |
7231 | + | |
7232 | +static inline void au_set_dbwh(struct dentry *dentry, aufs_bindex_t bindex) | |
7233 | +{ | |
1308ab2a | 7234 | + DiMustWriteLock(dentry); |
1facf9fc | 7235 | + /* dbwh can be outside of bstart - bend range */ |
7236 | + au_di(dentry)->di_bwh = bindex; | |
7237 | +} | |
7238 | + | |
7239 | +static inline void au_set_dbdiropq(struct dentry *dentry, aufs_bindex_t bindex) | |
7240 | +{ | |
1308ab2a | 7241 | + DiMustWriteLock(dentry); |
1facf9fc | 7242 | + au_di(dentry)->di_bdiropq = bindex; |
7243 | +} | |
7244 | + | |
7245 | +/* ---------------------------------------------------------------------- */ | |
7246 | + | |
4a4d8108 | 7247 | +#ifdef CONFIG_AUFS_HNOTIFY |
1facf9fc | 7248 | +static inline void au_digen_dec(struct dentry *d) |
7249 | +{ | |
e49829fe | 7250 | + atomic_dec(&au_di(d)->di_generation); |
1facf9fc | 7251 | +} |
7252 | + | |
4a4d8108 | 7253 | +static inline void au_hn_di_reinit(struct dentry *dentry) |
1facf9fc | 7254 | +{ |
7255 | + dentry->d_fsdata = NULL; | |
7256 | +} | |
7257 | +#else | |
4a4d8108 AM |
7258 | +AuStubVoid(au_hn_di_reinit, struct dentry *dentry __maybe_unused) |
7259 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
1facf9fc | 7260 | + |
7261 | +#endif /* __KERNEL__ */ | |
7262 | +#endif /* __AUFS_DENTRY_H__ */ | |
7f207e10 AM |
7263 | diff -urN /usr/share/empty/fs/aufs/dinfo.c linux/fs/aufs/dinfo.c |
7264 | --- /usr/share/empty/fs/aufs/dinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 7265 | +++ linux/fs/aufs/dinfo.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 7266 | @@ -0,0 +1,543 @@ |
1facf9fc | 7267 | +/* |
027c5e7a | 7268 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 7269 | + * |
7270 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7271 | + * it under the terms of the GNU General Public License as published by | |
7272 | + * the Free Software Foundation; either version 2 of the License, or | |
7273 | + * (at your option) any later version. | |
dece6358 AM |
7274 | + * |
7275 | + * This program is distributed in the hope that it will be useful, | |
7276 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7277 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7278 | + * GNU General Public License for more details. | |
7279 | + * | |
7280 | + * You should have received a copy of the GNU General Public License | |
7281 | + * along with this program; if not, write to the Free Software | |
7282 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 7283 | + */ |
7284 | + | |
7285 | +/* | |
7286 | + * dentry private data | |
7287 | + */ | |
7288 | + | |
7289 | +#include "aufs.h" | |
7290 | + | |
e49829fe | 7291 | +void au_di_init_once(void *_dinfo) |
4a4d8108 | 7292 | +{ |
e49829fe JR |
7293 | + struct au_dinfo *dinfo = _dinfo; |
7294 | + static struct lock_class_key aufs_di; | |
4a4d8108 | 7295 | + |
e49829fe JR |
7296 | + au_rw_init(&dinfo->di_rwsem); |
7297 | + au_rw_class(&dinfo->di_rwsem, &aufs_di); | |
4a4d8108 AM |
7298 | +} |
7299 | + | |
027c5e7a | 7300 | +struct au_dinfo *au_di_alloc(struct super_block *sb, unsigned int lsc) |
1facf9fc | 7301 | +{ |
7302 | + struct au_dinfo *dinfo; | |
027c5e7a | 7303 | + int nbr, i; |
1facf9fc | 7304 | + |
7305 | + dinfo = au_cache_alloc_dinfo(); | |
7306 | + if (unlikely(!dinfo)) | |
7307 | + goto out; | |
7308 | + | |
1facf9fc | 7309 | + nbr = au_sbend(sb) + 1; |
7310 | + if (nbr <= 0) | |
7311 | + nbr = 1; | |
7312 | + dinfo->di_hdentry = kcalloc(nbr, sizeof(*dinfo->di_hdentry), GFP_NOFS); | |
027c5e7a AM |
7313 | + if (dinfo->di_hdentry) { |
7314 | + au_rw_write_lock_nested(&dinfo->di_rwsem, lsc); | |
7315 | + dinfo->di_bstart = -1; | |
7316 | + dinfo->di_bend = -1; | |
7317 | + dinfo->di_bwh = -1; | |
7318 | + dinfo->di_bdiropq = -1; | |
7319 | + for (i = 0; i < nbr; i++) | |
7320 | + dinfo->di_hdentry[i].hd_id = -1; | |
7321 | + goto out; | |
7322 | + } | |
1facf9fc | 7323 | + |
1facf9fc | 7324 | + au_cache_free_dinfo(dinfo); |
027c5e7a AM |
7325 | + dinfo = NULL; |
7326 | + | |
4f0767ce | 7327 | +out: |
027c5e7a | 7328 | + return dinfo; |
1facf9fc | 7329 | +} |
7330 | + | |
027c5e7a | 7331 | +void au_di_free(struct au_dinfo *dinfo) |
4a4d8108 | 7332 | +{ |
4a4d8108 AM |
7333 | + struct au_hdentry *p; |
7334 | + aufs_bindex_t bend, bindex; | |
7335 | + | |
7336 | + /* dentry may not be revalidated */ | |
027c5e7a | 7337 | + bindex = dinfo->di_bstart; |
4a4d8108 | 7338 | + if (bindex >= 0) { |
027c5e7a AM |
7339 | + bend = dinfo->di_bend; |
7340 | + p = dinfo->di_hdentry + bindex; | |
4a4d8108 AM |
7341 | + while (bindex++ <= bend) |
7342 | + au_hdput(p++); | |
7343 | + } | |
027c5e7a AM |
7344 | + kfree(dinfo->di_hdentry); |
7345 | + au_cache_free_dinfo(dinfo); | |
7346 | +} | |
7347 | + | |
7348 | +void au_di_swap(struct au_dinfo *a, struct au_dinfo *b) | |
7349 | +{ | |
7350 | + struct au_hdentry *p; | |
7351 | + aufs_bindex_t bi; | |
7352 | + | |
7353 | + AuRwMustWriteLock(&a->di_rwsem); | |
7354 | + AuRwMustWriteLock(&b->di_rwsem); | |
7355 | + | |
7356 | +#define DiSwap(v, name) \ | |
7357 | + do { \ | |
7358 | + v = a->di_##name; \ | |
7359 | + a->di_##name = b->di_##name; \ | |
7360 | + b->di_##name = v; \ | |
7361 | + } while (0) | |
7362 | + | |
7363 | + DiSwap(p, hdentry); | |
7364 | + DiSwap(bi, bstart); | |
7365 | + DiSwap(bi, bend); | |
7366 | + DiSwap(bi, bwh); | |
7367 | + DiSwap(bi, bdiropq); | |
7368 | + /* smp_mb(); */ | |
7369 | + | |
7370 | +#undef DiSwap | |
7371 | +} | |
7372 | + | |
7373 | +void au_di_cp(struct au_dinfo *dst, struct au_dinfo *src) | |
7374 | +{ | |
7375 | + AuRwMustWriteLock(&dst->di_rwsem); | |
7376 | + AuRwMustWriteLock(&src->di_rwsem); | |
7377 | + | |
7378 | + dst->di_bstart = src->di_bstart; | |
7379 | + dst->di_bend = src->di_bend; | |
7380 | + dst->di_bwh = src->di_bwh; | |
7381 | + dst->di_bdiropq = src->di_bdiropq; | |
7382 | + /* smp_mb(); */ | |
7383 | +} | |
7384 | + | |
7385 | +int au_di_init(struct dentry *dentry) | |
7386 | +{ | |
7387 | + int err; | |
7388 | + struct super_block *sb; | |
7389 | + struct au_dinfo *dinfo; | |
7390 | + | |
7391 | + err = 0; | |
7392 | + sb = dentry->d_sb; | |
7393 | + dinfo = au_di_alloc(sb, AuLsc_DI_CHILD); | |
7394 | + if (dinfo) { | |
7395 | + atomic_set(&dinfo->di_generation, au_sigen(sb)); | |
7396 | + /* smp_mb(); */ /* atomic_set */ | |
7397 | + dentry->d_fsdata = dinfo; | |
7398 | + } else | |
7399 | + err = -ENOMEM; | |
7400 | + | |
7401 | + return err; | |
7402 | +} | |
7403 | + | |
7404 | +void au_di_fin(struct dentry *dentry) | |
7405 | +{ | |
7406 | + struct au_dinfo *dinfo; | |
7407 | + | |
7408 | + dinfo = au_di(dentry); | |
7409 | + AuRwDestroy(&dinfo->di_rwsem); | |
7410 | + au_di_free(dinfo); | |
4a4d8108 AM |
7411 | +} |
7412 | + | |
1facf9fc | 7413 | +int au_di_realloc(struct au_dinfo *dinfo, int nbr) |
7414 | +{ | |
7415 | + int err, sz; | |
7416 | + struct au_hdentry *hdp; | |
7417 | + | |
1308ab2a | 7418 | + AuRwMustWriteLock(&dinfo->di_rwsem); |
7419 | + | |
1facf9fc | 7420 | + err = -ENOMEM; |
7421 | + sz = sizeof(*hdp) * (dinfo->di_bend + 1); | |
7422 | + if (!sz) | |
7423 | + sz = sizeof(*hdp); | |
7424 | + hdp = au_kzrealloc(dinfo->di_hdentry, sz, sizeof(*hdp) * nbr, GFP_NOFS); | |
7425 | + if (hdp) { | |
7426 | + dinfo->di_hdentry = hdp; | |
7427 | + err = 0; | |
7428 | + } | |
7429 | + | |
7430 | + return err; | |
7431 | +} | |
7432 | + | |
7433 | +/* ---------------------------------------------------------------------- */ | |
7434 | + | |
7435 | +static void do_ii_write_lock(struct inode *inode, unsigned int lsc) | |
7436 | +{ | |
7437 | + switch (lsc) { | |
7438 | + case AuLsc_DI_CHILD: | |
7439 | + ii_write_lock_child(inode); | |
7440 | + break; | |
7441 | + case AuLsc_DI_CHILD2: | |
7442 | + ii_write_lock_child2(inode); | |
7443 | + break; | |
7444 | + case AuLsc_DI_CHILD3: | |
7445 | + ii_write_lock_child3(inode); | |
7446 | + break; | |
7447 | + case AuLsc_DI_PARENT: | |
7448 | + ii_write_lock_parent(inode); | |
7449 | + break; | |
7450 | + case AuLsc_DI_PARENT2: | |
7451 | + ii_write_lock_parent2(inode); | |
7452 | + break; | |
7453 | + case AuLsc_DI_PARENT3: | |
7454 | + ii_write_lock_parent3(inode); | |
7455 | + break; | |
7456 | + default: | |
7457 | + BUG(); | |
7458 | + } | |
7459 | +} | |
7460 | + | |
7461 | +static void do_ii_read_lock(struct inode *inode, unsigned int lsc) | |
7462 | +{ | |
7463 | + switch (lsc) { | |
7464 | + case AuLsc_DI_CHILD: | |
7465 | + ii_read_lock_child(inode); | |
7466 | + break; | |
7467 | + case AuLsc_DI_CHILD2: | |
7468 | + ii_read_lock_child2(inode); | |
7469 | + break; | |
7470 | + case AuLsc_DI_CHILD3: | |
7471 | + ii_read_lock_child3(inode); | |
7472 | + break; | |
7473 | + case AuLsc_DI_PARENT: | |
7474 | + ii_read_lock_parent(inode); | |
7475 | + break; | |
7476 | + case AuLsc_DI_PARENT2: | |
7477 | + ii_read_lock_parent2(inode); | |
7478 | + break; | |
7479 | + case AuLsc_DI_PARENT3: | |
7480 | + ii_read_lock_parent3(inode); | |
7481 | + break; | |
7482 | + default: | |
7483 | + BUG(); | |
7484 | + } | |
7485 | +} | |
7486 | + | |
7487 | +void di_read_lock(struct dentry *d, int flags, unsigned int lsc) | |
7488 | +{ | |
dece6358 | 7489 | + au_rw_read_lock_nested(&au_di(d)->di_rwsem, lsc); |
1facf9fc | 7490 | + if (d->d_inode) { |
7491 | + if (au_ftest_lock(flags, IW)) | |
7492 | + do_ii_write_lock(d->d_inode, lsc); | |
7493 | + else if (au_ftest_lock(flags, IR)) | |
7494 | + do_ii_read_lock(d->d_inode, lsc); | |
7495 | + } | |
7496 | +} | |
7497 | + | |
7498 | +void di_read_unlock(struct dentry *d, int flags) | |
7499 | +{ | |
7500 | + if (d->d_inode) { | |
027c5e7a AM |
7501 | + if (au_ftest_lock(flags, IW)) { |
7502 | + au_dbg_verify_dinode(d); | |
1facf9fc | 7503 | + ii_write_unlock(d->d_inode); |
027c5e7a AM |
7504 | + } else if (au_ftest_lock(flags, IR)) { |
7505 | + au_dbg_verify_dinode(d); | |
1facf9fc | 7506 | + ii_read_unlock(d->d_inode); |
027c5e7a | 7507 | + } |
1facf9fc | 7508 | + } |
dece6358 | 7509 | + au_rw_read_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 7510 | +} |
7511 | + | |
7512 | +void di_downgrade_lock(struct dentry *d, int flags) | |
7513 | +{ | |
1facf9fc | 7514 | + if (d->d_inode && au_ftest_lock(flags, IR)) |
7515 | + ii_downgrade_lock(d->d_inode); | |
dece6358 | 7516 | + au_rw_dgrade_lock(&au_di(d)->di_rwsem); |
1facf9fc | 7517 | +} |
7518 | + | |
7519 | +void di_write_lock(struct dentry *d, unsigned int lsc) | |
7520 | +{ | |
dece6358 | 7521 | + au_rw_write_lock_nested(&au_di(d)->di_rwsem, lsc); |
1facf9fc | 7522 | + if (d->d_inode) |
7523 | + do_ii_write_lock(d->d_inode, lsc); | |
7524 | +} | |
7525 | + | |
7526 | +void di_write_unlock(struct dentry *d) | |
7527 | +{ | |
027c5e7a | 7528 | + au_dbg_verify_dinode(d); |
1facf9fc | 7529 | + if (d->d_inode) |
7530 | + ii_write_unlock(d->d_inode); | |
dece6358 | 7531 | + au_rw_write_unlock(&au_di(d)->di_rwsem); |
1facf9fc | 7532 | +} |
7533 | + | |
7534 | +void di_write_lock2_child(struct dentry *d1, struct dentry *d2, int isdir) | |
7535 | +{ | |
7536 | + AuDebugOn(d1 == d2 | |
7537 | + || d1->d_inode == d2->d_inode | |
7538 | + || d1->d_sb != d2->d_sb); | |
7539 | + | |
7540 | + if (isdir && au_test_subdir(d1, d2)) { | |
7541 | + di_write_lock_child(d1); | |
7542 | + di_write_lock_child2(d2); | |
7543 | + } else { | |
7544 | + /* there should be no races */ | |
7545 | + di_write_lock_child(d2); | |
7546 | + di_write_lock_child2(d1); | |
7547 | + } | |
7548 | +} | |
7549 | + | |
7550 | +void di_write_lock2_parent(struct dentry *d1, struct dentry *d2, int isdir) | |
7551 | +{ | |
7552 | + AuDebugOn(d1 == d2 | |
7553 | + || d1->d_inode == d2->d_inode | |
7554 | + || d1->d_sb != d2->d_sb); | |
7555 | + | |
7556 | + if (isdir && au_test_subdir(d1, d2)) { | |
7557 | + di_write_lock_parent(d1); | |
7558 | + di_write_lock_parent2(d2); | |
7559 | + } else { | |
7560 | + /* there should be no races */ | |
7561 | + di_write_lock_parent(d2); | |
7562 | + di_write_lock_parent2(d1); | |
7563 | + } | |
7564 | +} | |
7565 | + | |
7566 | +void di_write_unlock2(struct dentry *d1, struct dentry *d2) | |
7567 | +{ | |
7568 | + di_write_unlock(d1); | |
7569 | + if (d1->d_inode == d2->d_inode) | |
dece6358 | 7570 | + au_rw_write_unlock(&au_di(d2)->di_rwsem); |
1facf9fc | 7571 | + else |
7572 | + di_write_unlock(d2); | |
7573 | +} | |
7574 | + | |
7575 | +/* ---------------------------------------------------------------------- */ | |
7576 | + | |
7577 | +struct dentry *au_h_dptr(struct dentry *dentry, aufs_bindex_t bindex) | |
7578 | +{ | |
7579 | + struct dentry *d; | |
7580 | + | |
1308ab2a | 7581 | + DiMustAnyLock(dentry); |
7582 | + | |
1facf9fc | 7583 | + if (au_dbstart(dentry) < 0 || bindex < au_dbstart(dentry)) |
7584 | + return NULL; | |
7585 | + AuDebugOn(bindex < 0); | |
7586 | + d = au_di(dentry)->di_hdentry[0 + bindex].hd_dentry; | |
027c5e7a | 7587 | + AuDebugOn(d && d->d_count <= 0); |
1facf9fc | 7588 | + return d; |
7589 | +} | |
7590 | + | |
2cbb1c4b JR |
7591 | +/* |
7592 | + * extended version of au_h_dptr(). | |
7593 | + * returns a hashed and positive h_dentry in bindex, NULL, or error. | |
7594 | + */ | |
7595 | +struct dentry *au_h_d_alias(struct dentry *dentry, aufs_bindex_t bindex) | |
7596 | +{ | |
7597 | + struct dentry *h_dentry; | |
7598 | + struct inode *inode, *h_inode; | |
7599 | + | |
7600 | + inode = dentry->d_inode; | |
7601 | + AuDebugOn(!inode); | |
7602 | + | |
7603 | + h_dentry = NULL; | |
7604 | + if (au_dbstart(dentry) <= bindex | |
7605 | + && bindex <= au_dbend(dentry)) | |
7606 | + h_dentry = au_h_dptr(dentry, bindex); | |
7607 | + if (h_dentry && !au_d_hashed_positive(h_dentry)) { | |
7608 | + dget(h_dentry); | |
7609 | + goto out; /* success */ | |
7610 | + } | |
7611 | + | |
7612 | + AuDebugOn(bindex < au_ibstart(inode)); | |
7613 | + AuDebugOn(au_ibend(inode) < bindex); | |
7614 | + h_inode = au_h_iptr(inode, bindex); | |
7615 | + h_dentry = d_find_alias(h_inode); | |
7616 | + if (h_dentry) { | |
7617 | + if (!IS_ERR(h_dentry)) { | |
7618 | + if (!au_d_hashed_positive(h_dentry)) | |
7619 | + goto out; /* success */ | |
7620 | + dput(h_dentry); | |
7621 | + } else | |
7622 | + goto out; | |
7623 | + } | |
7624 | + | |
7625 | + if (au_opt_test(au_mntflags(dentry->d_sb), PLINK)) { | |
7626 | + h_dentry = au_plink_lkup(inode, bindex); | |
7627 | + AuDebugOn(!h_dentry); | |
7628 | + if (!IS_ERR(h_dentry)) { | |
7629 | + if (!au_d_hashed_positive(h_dentry)) | |
7630 | + goto out; /* success */ | |
7631 | + dput(h_dentry); | |
7632 | + h_dentry = NULL; | |
7633 | + } | |
7634 | + } | |
7635 | + | |
7636 | +out: | |
7637 | + AuDbgDentry(h_dentry); | |
7638 | + return h_dentry; | |
7639 | +} | |
7640 | + | |
1facf9fc | 7641 | +aufs_bindex_t au_dbtail(struct dentry *dentry) |
7642 | +{ | |
7643 | + aufs_bindex_t bend, bwh; | |
7644 | + | |
7645 | + bend = au_dbend(dentry); | |
7646 | + if (0 <= bend) { | |
7647 | + bwh = au_dbwh(dentry); | |
7648 | + if (!bwh) | |
7649 | + return bwh; | |
7650 | + if (0 < bwh && bwh < bend) | |
7651 | + return bwh - 1; | |
7652 | + } | |
7653 | + return bend; | |
7654 | +} | |
7655 | + | |
7656 | +aufs_bindex_t au_dbtaildir(struct dentry *dentry) | |
7657 | +{ | |
7658 | + aufs_bindex_t bend, bopq; | |
7659 | + | |
7660 | + bend = au_dbtail(dentry); | |
7661 | + if (0 <= bend) { | |
7662 | + bopq = au_dbdiropq(dentry); | |
7663 | + if (0 <= bopq && bopq < bend) | |
7664 | + bend = bopq; | |
7665 | + } | |
7666 | + return bend; | |
7667 | +} | |
7668 | + | |
7669 | +/* ---------------------------------------------------------------------- */ | |
7670 | + | |
7671 | +void au_set_h_dptr(struct dentry *dentry, aufs_bindex_t bindex, | |
7672 | + struct dentry *h_dentry) | |
7673 | +{ | |
7674 | + struct au_hdentry *hd = au_di(dentry)->di_hdentry + bindex; | |
027c5e7a | 7675 | + struct au_branch *br; |
1facf9fc | 7676 | + |
1308ab2a | 7677 | + DiMustWriteLock(dentry); |
7678 | + | |
4a4d8108 | 7679 | + au_hdput(hd); |
1facf9fc | 7680 | + hd->hd_dentry = h_dentry; |
027c5e7a AM |
7681 | + if (h_dentry) { |
7682 | + br = au_sbr(dentry->d_sb, bindex); | |
7683 | + hd->hd_id = br->br_id; | |
7684 | + } | |
7685 | +} | |
7686 | + | |
7687 | +int au_dbrange_test(struct dentry *dentry) | |
7688 | +{ | |
7689 | + int err; | |
7690 | + aufs_bindex_t bstart, bend; | |
7691 | + | |
7692 | + err = 0; | |
7693 | + bstart = au_dbstart(dentry); | |
7694 | + bend = au_dbend(dentry); | |
7695 | + if (bstart >= 0) | |
7696 | + AuDebugOn(bend < 0 && bstart > bend); | |
7697 | + else { | |
7698 | + err = -EIO; | |
7699 | + AuDebugOn(bend >= 0); | |
7700 | + } | |
7701 | + | |
7702 | + return err; | |
7703 | +} | |
7704 | + | |
7705 | +int au_digen_test(struct dentry *dentry, unsigned int sigen) | |
7706 | +{ | |
7707 | + int err; | |
7708 | + | |
7709 | + err = 0; | |
7710 | + if (unlikely(au_digen(dentry) != sigen | |
7711 | + || au_iigen_test(dentry->d_inode, sigen))) | |
7712 | + err = -EIO; | |
7713 | + | |
7714 | + return err; | |
1facf9fc | 7715 | +} |
7716 | + | |
7717 | +void au_update_digen(struct dentry *dentry) | |
7718 | +{ | |
7719 | + atomic_set(&au_di(dentry)->di_generation, au_sigen(dentry->d_sb)); | |
7720 | + /* smp_mb(); */ /* atomic_set */ | |
7721 | +} | |
7722 | + | |
7723 | +void au_update_dbrange(struct dentry *dentry, int do_put_zero) | |
7724 | +{ | |
7725 | + struct au_dinfo *dinfo; | |
7726 | + struct dentry *h_d; | |
4a4d8108 | 7727 | + struct au_hdentry *hdp; |
1facf9fc | 7728 | + |
1308ab2a | 7729 | + DiMustWriteLock(dentry); |
7730 | + | |
1facf9fc | 7731 | + dinfo = au_di(dentry); |
7732 | + if (!dinfo || dinfo->di_bstart < 0) | |
7733 | + return; | |
7734 | + | |
4a4d8108 | 7735 | + hdp = dinfo->di_hdentry; |
1facf9fc | 7736 | + if (do_put_zero) { |
7737 | + aufs_bindex_t bindex, bend; | |
7738 | + | |
7739 | + bend = dinfo->di_bend; | |
7740 | + for (bindex = dinfo->di_bstart; bindex <= bend; bindex++) { | |
4a4d8108 | 7741 | + h_d = hdp[0 + bindex].hd_dentry; |
1facf9fc | 7742 | + if (h_d && !h_d->d_inode) |
7743 | + au_set_h_dptr(dentry, bindex, NULL); | |
7744 | + } | |
7745 | + } | |
7746 | + | |
7747 | + dinfo->di_bstart = -1; | |
7748 | + while (++dinfo->di_bstart <= dinfo->di_bend) | |
4a4d8108 | 7749 | + if (hdp[0 + dinfo->di_bstart].hd_dentry) |
1facf9fc | 7750 | + break; |
7751 | + if (dinfo->di_bstart > dinfo->di_bend) { | |
7752 | + dinfo->di_bstart = -1; | |
7753 | + dinfo->di_bend = -1; | |
7754 | + return; | |
7755 | + } | |
7756 | + | |
7757 | + dinfo->di_bend++; | |
7758 | + while (0 <= --dinfo->di_bend) | |
4a4d8108 | 7759 | + if (hdp[0 + dinfo->di_bend].hd_dentry) |
1facf9fc | 7760 | + break; |
7761 | + AuDebugOn(dinfo->di_bstart > dinfo->di_bend || dinfo->di_bend < 0); | |
7762 | +} | |
7763 | + | |
7764 | +void au_update_dbstart(struct dentry *dentry) | |
7765 | +{ | |
7766 | + aufs_bindex_t bindex, bend; | |
7767 | + struct dentry *h_dentry; | |
7768 | + | |
7769 | + bend = au_dbend(dentry); | |
7770 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) { | |
7771 | + h_dentry = au_h_dptr(dentry, bindex); | |
7772 | + if (!h_dentry) | |
7773 | + continue; | |
7774 | + if (h_dentry->d_inode) { | |
7775 | + au_set_dbstart(dentry, bindex); | |
7776 | + return; | |
7777 | + } | |
7778 | + au_set_h_dptr(dentry, bindex, NULL); | |
7779 | + } | |
7780 | +} | |
7781 | + | |
7782 | +void au_update_dbend(struct dentry *dentry) | |
7783 | +{ | |
7784 | + aufs_bindex_t bindex, bstart; | |
7785 | + struct dentry *h_dentry; | |
7786 | + | |
7787 | + bstart = au_dbstart(dentry); | |
7f207e10 | 7788 | + for (bindex = au_dbend(dentry); bindex >= bstart; bindex--) { |
1facf9fc | 7789 | + h_dentry = au_h_dptr(dentry, bindex); |
7790 | + if (!h_dentry) | |
7791 | + continue; | |
7792 | + if (h_dentry->d_inode) { | |
7793 | + au_set_dbend(dentry, bindex); | |
7794 | + return; | |
7795 | + } | |
7796 | + au_set_h_dptr(dentry, bindex, NULL); | |
7797 | + } | |
7798 | +} | |
7799 | + | |
7800 | +int au_find_dbindex(struct dentry *dentry, struct dentry *h_dentry) | |
7801 | +{ | |
7802 | + aufs_bindex_t bindex, bend; | |
7803 | + | |
7804 | + bend = au_dbend(dentry); | |
7805 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) | |
7806 | + if (au_h_dptr(dentry, bindex) == h_dentry) | |
7807 | + return bindex; | |
7808 | + return -1; | |
7809 | +} | |
7f207e10 AM |
7810 | diff -urN /usr/share/empty/fs/aufs/dir.c linux/fs/aufs/dir.c |
7811 | --- /usr/share/empty/fs/aufs/dir.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
7812 | +++ linux/fs/aufs/dir.c 2011-08-24 13:30:24.731313534 +0200 |
7813 | @@ -0,0 +1,624 @@ | |
1facf9fc | 7814 | +/* |
027c5e7a | 7815 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 7816 | + * |
7817 | + * This program, aufs is free software; you can redistribute it and/or modify | |
7818 | + * it under the terms of the GNU General Public License as published by | |
7819 | + * the Free Software Foundation; either version 2 of the License, or | |
7820 | + * (at your option) any later version. | |
dece6358 AM |
7821 | + * |
7822 | + * This program is distributed in the hope that it will be useful, | |
7823 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
7824 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
7825 | + * GNU General Public License for more details. | |
7826 | + * | |
7827 | + * You should have received a copy of the GNU General Public License | |
7828 | + * along with this program; if not, write to the Free Software | |
7829 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 7830 | + */ |
7831 | + | |
7832 | +/* | |
7833 | + * directory operations | |
7834 | + */ | |
7835 | + | |
dece6358 | 7836 | +#include <linux/file.h> |
1facf9fc | 7837 | +#include <linux/fs_stack.h> |
7838 | +#include "aufs.h" | |
7839 | + | |
7840 | +void au_add_nlink(struct inode *dir, struct inode *h_dir) | |
7841 | +{ | |
7842 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); | |
7843 | + | |
7844 | + dir->i_nlink += h_dir->i_nlink - 2; | |
7845 | + if (h_dir->i_nlink < 2) | |
7846 | + dir->i_nlink += 2; | |
7847 | +} | |
7848 | + | |
7849 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir) | |
7850 | +{ | |
7851 | + AuDebugOn(!S_ISDIR(dir->i_mode) || !S_ISDIR(h_dir->i_mode)); | |
7852 | + | |
7853 | + dir->i_nlink -= h_dir->i_nlink - 2; | |
7854 | + if (h_dir->i_nlink < 2) | |
7855 | + dir->i_nlink -= 2; | |
7856 | +} | |
7857 | + | |
1308ab2a | 7858 | +loff_t au_dir_size(struct file *file, struct dentry *dentry) |
7859 | +{ | |
7860 | + loff_t sz; | |
7861 | + aufs_bindex_t bindex, bend; | |
7862 | + struct file *h_file; | |
7863 | + struct dentry *h_dentry; | |
7864 | + | |
7865 | + sz = 0; | |
7866 | + if (file) { | |
7867 | + AuDebugOn(!file->f_dentry); | |
7868 | + AuDebugOn(!file->f_dentry->d_inode); | |
7869 | + AuDebugOn(!S_ISDIR(file->f_dentry->d_inode->i_mode)); | |
7870 | + | |
4a4d8108 | 7871 | + bend = au_fbend_dir(file); |
1308ab2a | 7872 | + for (bindex = au_fbstart(file); |
7873 | + bindex <= bend && sz < KMALLOC_MAX_SIZE; | |
7874 | + bindex++) { | |
4a4d8108 | 7875 | + h_file = au_hf_dir(file, bindex); |
1308ab2a | 7876 | + if (h_file |
7877 | + && h_file->f_dentry | |
7878 | + && h_file->f_dentry->d_inode) | |
7879 | + sz += i_size_read(h_file->f_dentry->d_inode); | |
7880 | + } | |
7881 | + } else { | |
7882 | + AuDebugOn(!dentry); | |
7883 | + AuDebugOn(!dentry->d_inode); | |
7884 | + AuDebugOn(!S_ISDIR(dentry->d_inode->i_mode)); | |
7885 | + | |
7886 | + bend = au_dbtaildir(dentry); | |
7887 | + for (bindex = au_dbstart(dentry); | |
7888 | + bindex <= bend && sz < KMALLOC_MAX_SIZE; | |
7889 | + bindex++) { | |
7890 | + h_dentry = au_h_dptr(dentry, bindex); | |
7891 | + if (h_dentry && h_dentry->d_inode) | |
7892 | + sz += i_size_read(h_dentry->d_inode); | |
7893 | + } | |
7894 | + } | |
7895 | + if (sz < KMALLOC_MAX_SIZE) | |
7896 | + sz = roundup_pow_of_two(sz); | |
7897 | + if (sz > KMALLOC_MAX_SIZE) | |
7898 | + sz = KMALLOC_MAX_SIZE; | |
7899 | + else if (sz < NAME_MAX) { | |
7900 | + BUILD_BUG_ON(AUFS_RDBLK_DEF < NAME_MAX); | |
7901 | + sz = AUFS_RDBLK_DEF; | |
7902 | + } | |
7903 | + return sz; | |
7904 | +} | |
7905 | + | |
1facf9fc | 7906 | +/* ---------------------------------------------------------------------- */ |
7907 | + | |
7908 | +static int reopen_dir(struct file *file) | |
7909 | +{ | |
7910 | + int err; | |
7911 | + unsigned int flags; | |
7912 | + aufs_bindex_t bindex, btail, bstart; | |
7913 | + struct dentry *dentry, *h_dentry; | |
7914 | + struct file *h_file; | |
7915 | + | |
7916 | + /* open all lower dirs */ | |
7917 | + dentry = file->f_dentry; | |
7918 | + bstart = au_dbstart(dentry); | |
7919 | + for (bindex = au_fbstart(file); bindex < bstart; bindex++) | |
7920 | + au_set_h_fptr(file, bindex, NULL); | |
7921 | + au_set_fbstart(file, bstart); | |
7922 | + | |
7923 | + btail = au_dbtaildir(dentry); | |
4a4d8108 | 7924 | + for (bindex = au_fbend_dir(file); btail < bindex; bindex--) |
1facf9fc | 7925 | + au_set_h_fptr(file, bindex, NULL); |
4a4d8108 | 7926 | + au_set_fbend_dir(file, btail); |
1facf9fc | 7927 | + |
4a4d8108 | 7928 | + flags = vfsub_file_flags(file); |
1facf9fc | 7929 | + for (bindex = bstart; bindex <= btail; bindex++) { |
7930 | + h_dentry = au_h_dptr(dentry, bindex); | |
7931 | + if (!h_dentry) | |
7932 | + continue; | |
4a4d8108 | 7933 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 7934 | + if (h_file) |
7935 | + continue; | |
7936 | + | |
7937 | + h_file = au_h_open(dentry, bindex, flags, file); | |
7938 | + err = PTR_ERR(h_file); | |
7939 | + if (IS_ERR(h_file)) | |
7940 | + goto out; /* close all? */ | |
7941 | + au_set_h_fptr(file, bindex, h_file); | |
7942 | + } | |
7943 | + au_update_figen(file); | |
7944 | + /* todo: necessary? */ | |
7945 | + /* file->f_ra = h_file->f_ra; */ | |
7946 | + err = 0; | |
7947 | + | |
4f0767ce | 7948 | +out: |
1facf9fc | 7949 | + return err; |
7950 | +} | |
7951 | + | |
7952 | +static int do_open_dir(struct file *file, int flags) | |
7953 | +{ | |
7954 | + int err; | |
7955 | + aufs_bindex_t bindex, btail; | |
7956 | + struct dentry *dentry, *h_dentry; | |
7957 | + struct file *h_file; | |
7958 | + | |
1308ab2a | 7959 | + FiMustWriteLock(file); |
7960 | + | |
1facf9fc | 7961 | + dentry = file->f_dentry; |
027c5e7a AM |
7962 | + err = au_alive_dir(dentry); |
7963 | + if (unlikely(err)) | |
7964 | + goto out; | |
7965 | + | |
1facf9fc | 7966 | + file->f_version = dentry->d_inode->i_version; |
7967 | + bindex = au_dbstart(dentry); | |
7968 | + au_set_fbstart(file, bindex); | |
7969 | + btail = au_dbtaildir(dentry); | |
4a4d8108 | 7970 | + au_set_fbend_dir(file, btail); |
1facf9fc | 7971 | + for (; !err && bindex <= btail; bindex++) { |
7972 | + h_dentry = au_h_dptr(dentry, bindex); | |
7973 | + if (!h_dentry) | |
7974 | + continue; | |
7975 | + | |
7976 | + h_file = au_h_open(dentry, bindex, flags, file); | |
7977 | + if (IS_ERR(h_file)) { | |
7978 | + err = PTR_ERR(h_file); | |
7979 | + break; | |
7980 | + } | |
7981 | + au_set_h_fptr(file, bindex, h_file); | |
7982 | + } | |
7983 | + au_update_figen(file); | |
7984 | + /* todo: necessary? */ | |
7985 | + /* file->f_ra = h_file->f_ra; */ | |
7986 | + if (!err) | |
7987 | + return 0; /* success */ | |
7988 | + | |
7989 | + /* close all */ | |
7990 | + for (bindex = au_fbstart(file); bindex <= btail; bindex++) | |
7991 | + au_set_h_fptr(file, bindex, NULL); | |
7992 | + au_set_fbstart(file, -1); | |
4a4d8108 AM |
7993 | + au_set_fbend_dir(file, -1); |
7994 | + | |
027c5e7a | 7995 | +out: |
1facf9fc | 7996 | + return err; |
7997 | +} | |
7998 | + | |
7999 | +static int aufs_open_dir(struct inode *inode __maybe_unused, | |
8000 | + struct file *file) | |
8001 | +{ | |
4a4d8108 AM |
8002 | + int err; |
8003 | + struct super_block *sb; | |
8004 | + struct au_fidir *fidir; | |
8005 | + | |
8006 | + err = -ENOMEM; | |
8007 | + sb = file->f_dentry->d_sb; | |
8008 | + si_read_lock(sb, AuLock_FLUSH); | |
e49829fe | 8009 | + fidir = au_fidir_alloc(sb); |
4a4d8108 AM |
8010 | + if (fidir) { |
8011 | + err = au_do_open(file, do_open_dir, fidir); | |
8012 | + if (unlikely(err)) | |
8013 | + kfree(fidir); | |
8014 | + } | |
8015 | + si_read_unlock(sb); | |
8016 | + return err; | |
1facf9fc | 8017 | +} |
8018 | + | |
8019 | +static int aufs_release_dir(struct inode *inode __maybe_unused, | |
8020 | + struct file *file) | |
8021 | +{ | |
8022 | + struct au_vdir *vdir_cache; | |
4a4d8108 AM |
8023 | + struct au_finfo *finfo; |
8024 | + struct au_fidir *fidir; | |
8025 | + aufs_bindex_t bindex, bend; | |
1facf9fc | 8026 | + |
4a4d8108 AM |
8027 | + finfo = au_fi(file); |
8028 | + fidir = finfo->fi_hdir; | |
8029 | + if (fidir) { | |
0c5527e5 AM |
8030 | + /* remove me from sb->s_files */ |
8031 | + file_sb_list_del(file); | |
8032 | + | |
4a4d8108 AM |
8033 | + vdir_cache = fidir->fd_vdir_cache; /* lock-free */ |
8034 | + if (vdir_cache) | |
8035 | + au_vdir_free(vdir_cache); | |
8036 | + | |
8037 | + bindex = finfo->fi_btop; | |
8038 | + if (bindex >= 0) { | |
8039 | + /* | |
8040 | + * calls fput() instead of filp_close(), | |
8041 | + * since no dnotify or lock for the lower file. | |
8042 | + */ | |
8043 | + bend = fidir->fd_bbot; | |
8044 | + for (; bindex <= bend; bindex++) | |
8045 | + au_set_h_fptr(file, bindex, NULL); | |
8046 | + } | |
8047 | + kfree(fidir); | |
8048 | + finfo->fi_hdir = NULL; | |
1facf9fc | 8049 | + } |
1facf9fc | 8050 | + au_finfo_fin(file); |
1facf9fc | 8051 | + return 0; |
8052 | +} | |
8053 | + | |
8054 | +/* ---------------------------------------------------------------------- */ | |
8055 | + | |
4a4d8108 AM |
8056 | +static int au_do_flush_dir(struct file *file, fl_owner_t id) |
8057 | +{ | |
8058 | + int err; | |
8059 | + aufs_bindex_t bindex, bend; | |
8060 | + struct file *h_file; | |
8061 | + | |
8062 | + err = 0; | |
8063 | + bend = au_fbend_dir(file); | |
8064 | + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) { | |
8065 | + h_file = au_hf_dir(file, bindex); | |
8066 | + if (h_file) | |
8067 | + err = vfsub_flush(h_file, id); | |
8068 | + } | |
8069 | + return err; | |
8070 | +} | |
8071 | + | |
8072 | +static int aufs_flush_dir(struct file *file, fl_owner_t id) | |
8073 | +{ | |
8074 | + return au_do_flush(file, id, au_do_flush_dir); | |
8075 | +} | |
8076 | + | |
8077 | +/* ---------------------------------------------------------------------- */ | |
8078 | + | |
1facf9fc | 8079 | +static int au_do_fsync_dir_no_file(struct dentry *dentry, int datasync) |
8080 | +{ | |
8081 | + int err; | |
8082 | + aufs_bindex_t bend, bindex; | |
8083 | + struct inode *inode; | |
8084 | + struct super_block *sb; | |
8085 | + | |
8086 | + err = 0; | |
8087 | + sb = dentry->d_sb; | |
8088 | + inode = dentry->d_inode; | |
8089 | + IMustLock(inode); | |
8090 | + bend = au_dbend(dentry); | |
8091 | + for (bindex = au_dbstart(dentry); !err && bindex <= bend; bindex++) { | |
8092 | + struct path h_path; | |
1facf9fc | 8093 | + |
8094 | + if (au_test_ro(sb, bindex, inode)) | |
8095 | + continue; | |
8096 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
8097 | + if (!h_path.dentry) | |
8098 | + continue; | |
1facf9fc | 8099 | + |
1facf9fc | 8100 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
53392da6 | 8101 | + err = vfsub_fsync(NULL, &h_path, datasync); |
1facf9fc | 8102 | + } |
8103 | + | |
8104 | + return err; | |
8105 | +} | |
8106 | + | |
8107 | +static int au_do_fsync_dir(struct file *file, int datasync) | |
8108 | +{ | |
8109 | + int err; | |
8110 | + aufs_bindex_t bend, bindex; | |
8111 | + struct file *h_file; | |
8112 | + struct super_block *sb; | |
8113 | + struct inode *inode; | |
1facf9fc | 8114 | + |
8115 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1); | |
8116 | + if (unlikely(err)) | |
8117 | + goto out; | |
8118 | + | |
8119 | + sb = file->f_dentry->d_sb; | |
8120 | + inode = file->f_dentry->d_inode; | |
4a4d8108 | 8121 | + bend = au_fbend_dir(file); |
1facf9fc | 8122 | + for (bindex = au_fbstart(file); !err && bindex <= bend; bindex++) { |
4a4d8108 | 8123 | + h_file = au_hf_dir(file, bindex); |
1facf9fc | 8124 | + if (!h_file || au_test_ro(sb, bindex, inode)) |
8125 | + continue; | |
8126 | + | |
53392da6 | 8127 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
1facf9fc | 8128 | + } |
8129 | + | |
4f0767ce | 8130 | +out: |
1facf9fc | 8131 | + return err; |
8132 | +} | |
8133 | + | |
8134 | +/* | |
8135 | + * @file may be NULL | |
8136 | + */ | |
b752ccd1 | 8137 | +static int aufs_fsync_dir(struct file *file, int datasync) |
1facf9fc | 8138 | +{ |
8139 | + int err; | |
b752ccd1 | 8140 | + struct dentry *dentry; |
1facf9fc | 8141 | + struct super_block *sb; |
8142 | + | |
b752ccd1 | 8143 | + dentry = file->f_dentry; |
1facf9fc | 8144 | + IMustLock(dentry->d_inode); |
8145 | + | |
8146 | + err = 0; | |
8147 | + sb = dentry->d_sb; | |
8148 | + si_noflush_read_lock(sb); | |
8149 | + if (file) | |
8150 | + err = au_do_fsync_dir(file, datasync); | |
8151 | + else { | |
8152 | + di_write_lock_child(dentry); | |
8153 | + err = au_do_fsync_dir_no_file(dentry, datasync); | |
8154 | + } | |
8155 | + au_cpup_attr_timesizes(dentry->d_inode); | |
8156 | + di_write_unlock(dentry); | |
8157 | + if (file) | |
8158 | + fi_write_unlock(file); | |
8159 | + | |
8160 | + si_read_unlock(sb); | |
8161 | + return err; | |
8162 | +} | |
8163 | + | |
8164 | +/* ---------------------------------------------------------------------- */ | |
8165 | + | |
8166 | +static int aufs_readdir(struct file *file, void *dirent, filldir_t filldir) | |
8167 | +{ | |
8168 | + int err; | |
8169 | + struct dentry *dentry; | |
8170 | + struct inode *inode; | |
8171 | + struct super_block *sb; | |
8172 | + | |
8173 | + dentry = file->f_dentry; | |
8174 | + inode = dentry->d_inode; | |
8175 | + IMustLock(inode); | |
8176 | + | |
8177 | + sb = dentry->d_sb; | |
8178 | + si_read_lock(sb, AuLock_FLUSH); | |
8179 | + err = au_reval_and_lock_fdi(file, reopen_dir, /*wlock*/1); | |
8180 | + if (unlikely(err)) | |
8181 | + goto out; | |
027c5e7a AM |
8182 | + err = au_alive_dir(dentry); |
8183 | + if (!err) | |
8184 | + err = au_vdir_init(file); | |
1facf9fc | 8185 | + di_downgrade_lock(dentry, AuLock_IR); |
8186 | + if (unlikely(err)) | |
8187 | + goto out_unlock; | |
8188 | + | |
b752ccd1 | 8189 | + if (!au_test_nfsd()) { |
1facf9fc | 8190 | + err = au_vdir_fill_de(file, dirent, filldir); |
8191 | + fsstack_copy_attr_atime(inode, | |
8192 | + au_h_iptr(inode, au_ibstart(inode))); | |
8193 | + } else { | |
8194 | + /* | |
8195 | + * nfsd filldir may call lookup_one_len(), vfs_getattr(), | |
8196 | + * encode_fh() and others. | |
8197 | + */ | |
8198 | + struct inode *h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
8199 | + | |
8200 | + di_read_unlock(dentry, AuLock_IR); | |
8201 | + si_read_unlock(sb); | |
1facf9fc | 8202 | + err = au_vdir_fill_de(file, dirent, filldir); |
1facf9fc | 8203 | + fsstack_copy_attr_atime(inode, h_inode); |
8204 | + fi_write_unlock(file); | |
8205 | + | |
8206 | + AuTraceErr(err); | |
8207 | + return err; | |
8208 | + } | |
8209 | + | |
4f0767ce | 8210 | +out_unlock: |
1facf9fc | 8211 | + di_read_unlock(dentry, AuLock_IR); |
8212 | + fi_write_unlock(file); | |
4f0767ce | 8213 | +out: |
1facf9fc | 8214 | + si_read_unlock(sb); |
8215 | + return err; | |
8216 | +} | |
8217 | + | |
8218 | +/* ---------------------------------------------------------------------- */ | |
8219 | + | |
8220 | +#define AuTestEmpty_WHONLY 1 | |
dece6358 AM |
8221 | +#define AuTestEmpty_CALLED (1 << 1) |
8222 | +#define AuTestEmpty_SHWH (1 << 2) | |
1facf9fc | 8223 | +#define au_ftest_testempty(flags, name) ((flags) & AuTestEmpty_##name) |
7f207e10 AM |
8224 | +#define au_fset_testempty(flags, name) \ |
8225 | + do { (flags) |= AuTestEmpty_##name; } while (0) | |
8226 | +#define au_fclr_testempty(flags, name) \ | |
8227 | + do { (flags) &= ~AuTestEmpty_##name; } while (0) | |
1facf9fc | 8228 | + |
dece6358 AM |
8229 | +#ifndef CONFIG_AUFS_SHWH |
8230 | +#undef AuTestEmpty_SHWH | |
8231 | +#define AuTestEmpty_SHWH 0 | |
8232 | +#endif | |
8233 | + | |
1facf9fc | 8234 | +struct test_empty_arg { |
1308ab2a | 8235 | + struct au_nhash *whlist; |
1facf9fc | 8236 | + unsigned int flags; |
8237 | + int err; | |
8238 | + aufs_bindex_t bindex; | |
8239 | +}; | |
8240 | + | |
8241 | +static int test_empty_cb(void *__arg, const char *__name, int namelen, | |
dece6358 AM |
8242 | + loff_t offset __maybe_unused, u64 ino, |
8243 | + unsigned int d_type) | |
1facf9fc | 8244 | +{ |
8245 | + struct test_empty_arg *arg = __arg; | |
8246 | + char *name = (void *)__name; | |
8247 | + | |
8248 | + arg->err = 0; | |
8249 | + au_fset_testempty(arg->flags, CALLED); | |
8250 | + /* smp_mb(); */ | |
8251 | + if (name[0] == '.' | |
8252 | + && (namelen == 1 || (name[1] == '.' && namelen == 2))) | |
8253 | + goto out; /* success */ | |
8254 | + | |
8255 | + if (namelen <= AUFS_WH_PFX_LEN | |
8256 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
8257 | + if (au_ftest_testempty(arg->flags, WHONLY) | |
1308ab2a | 8258 | + && !au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 8259 | + arg->err = -ENOTEMPTY; |
8260 | + goto out; | |
8261 | + } | |
8262 | + | |
8263 | + name += AUFS_WH_PFX_LEN; | |
8264 | + namelen -= AUFS_WH_PFX_LEN; | |
1308ab2a | 8265 | + if (!au_nhash_test_known_wh(arg->whlist, name, namelen)) |
1facf9fc | 8266 | + arg->err = au_nhash_append_wh |
1308ab2a | 8267 | + (arg->whlist, name, namelen, ino, d_type, arg->bindex, |
dece6358 | 8268 | + au_ftest_testempty(arg->flags, SHWH)); |
1facf9fc | 8269 | + |
4f0767ce | 8270 | +out: |
1facf9fc | 8271 | + /* smp_mb(); */ |
8272 | + AuTraceErr(arg->err); | |
8273 | + return arg->err; | |
8274 | +} | |
8275 | + | |
8276 | +static int do_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
8277 | +{ | |
8278 | + int err; | |
8279 | + struct file *h_file; | |
8280 | + | |
8281 | + h_file = au_h_open(dentry, arg->bindex, | |
8282 | + O_RDONLY | O_NONBLOCK | O_DIRECTORY | O_LARGEFILE, | |
8283 | + /*file*/NULL); | |
8284 | + err = PTR_ERR(h_file); | |
8285 | + if (IS_ERR(h_file)) | |
8286 | + goto out; | |
8287 | + | |
8288 | + err = 0; | |
8289 | + if (!au_opt_test(au_mntflags(dentry->d_sb), UDBA_NONE) | |
8290 | + && !h_file->f_dentry->d_inode->i_nlink) | |
8291 | + goto out_put; | |
8292 | + | |
8293 | + do { | |
8294 | + arg->err = 0; | |
8295 | + au_fclr_testempty(arg->flags, CALLED); | |
8296 | + /* smp_mb(); */ | |
8297 | + err = vfsub_readdir(h_file, test_empty_cb, arg); | |
8298 | + if (err >= 0) | |
8299 | + err = arg->err; | |
8300 | + } while (!err && au_ftest_testempty(arg->flags, CALLED)); | |
8301 | + | |
4f0767ce | 8302 | +out_put: |
1facf9fc | 8303 | + fput(h_file); |
8304 | + au_sbr_put(dentry->d_sb, arg->bindex); | |
4f0767ce | 8305 | +out: |
1facf9fc | 8306 | + return err; |
8307 | +} | |
8308 | + | |
8309 | +struct do_test_empty_args { | |
8310 | + int *errp; | |
8311 | + struct dentry *dentry; | |
8312 | + struct test_empty_arg *arg; | |
8313 | +}; | |
8314 | + | |
8315 | +static void call_do_test_empty(void *args) | |
8316 | +{ | |
8317 | + struct do_test_empty_args *a = args; | |
8318 | + *a->errp = do_test_empty(a->dentry, a->arg); | |
8319 | +} | |
8320 | + | |
8321 | +static int sio_test_empty(struct dentry *dentry, struct test_empty_arg *arg) | |
8322 | +{ | |
8323 | + int err, wkq_err; | |
8324 | + struct dentry *h_dentry; | |
8325 | + struct inode *h_inode; | |
8326 | + | |
8327 | + h_dentry = au_h_dptr(dentry, arg->bindex); | |
8328 | + h_inode = h_dentry->d_inode; | |
53392da6 | 8329 | + /* todo: i_mode changes anytime? */ |
1facf9fc | 8330 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); |
8331 | + err = au_test_h_perm_sio(h_inode, MAY_EXEC | MAY_READ); | |
8332 | + mutex_unlock(&h_inode->i_mutex); | |
8333 | + if (!err) | |
8334 | + err = do_test_empty(dentry, arg); | |
8335 | + else { | |
8336 | + struct do_test_empty_args args = { | |
8337 | + .errp = &err, | |
8338 | + .dentry = dentry, | |
8339 | + .arg = arg | |
8340 | + }; | |
8341 | + unsigned int flags = arg->flags; | |
8342 | + | |
8343 | + wkq_err = au_wkq_wait(call_do_test_empty, &args); | |
8344 | + if (unlikely(wkq_err)) | |
8345 | + err = wkq_err; | |
8346 | + arg->flags = flags; | |
8347 | + } | |
8348 | + | |
8349 | + return err; | |
8350 | +} | |
8351 | + | |
8352 | +int au_test_empty_lower(struct dentry *dentry) | |
8353 | +{ | |
8354 | + int err; | |
1308ab2a | 8355 | + unsigned int rdhash; |
1facf9fc | 8356 | + aufs_bindex_t bindex, bstart, btail; |
1308ab2a | 8357 | + struct au_nhash whlist; |
1facf9fc | 8358 | + struct test_empty_arg arg; |
1facf9fc | 8359 | + |
dece6358 AM |
8360 | + SiMustAnyLock(dentry->d_sb); |
8361 | + | |
1308ab2a | 8362 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; |
8363 | + if (!rdhash) | |
8364 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, dentry)); | |
8365 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
dece6358 | 8366 | + if (unlikely(err)) |
1facf9fc | 8367 | + goto out; |
8368 | + | |
1facf9fc | 8369 | + arg.flags = 0; |
1308ab2a | 8370 | + arg.whlist = &whlist; |
8371 | + bstart = au_dbstart(dentry); | |
dece6358 AM |
8372 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
8373 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 8374 | + arg.bindex = bstart; |
8375 | + err = do_test_empty(dentry, &arg); | |
8376 | + if (unlikely(err)) | |
8377 | + goto out_whlist; | |
8378 | + | |
8379 | + au_fset_testempty(arg.flags, WHONLY); | |
8380 | + btail = au_dbtaildir(dentry); | |
8381 | + for (bindex = bstart + 1; !err && bindex <= btail; bindex++) { | |
8382 | + struct dentry *h_dentry; | |
8383 | + | |
8384 | + h_dentry = au_h_dptr(dentry, bindex); | |
8385 | + if (h_dentry && h_dentry->d_inode) { | |
8386 | + arg.bindex = bindex; | |
8387 | + err = do_test_empty(dentry, &arg); | |
8388 | + } | |
8389 | + } | |
8390 | + | |
4f0767ce | 8391 | +out_whlist: |
1308ab2a | 8392 | + au_nhash_wh_free(&whlist); |
4f0767ce | 8393 | +out: |
1facf9fc | 8394 | + return err; |
8395 | +} | |
8396 | + | |
8397 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist) | |
8398 | +{ | |
8399 | + int err; | |
8400 | + struct test_empty_arg arg; | |
8401 | + aufs_bindex_t bindex, btail; | |
8402 | + | |
8403 | + err = 0; | |
1308ab2a | 8404 | + arg.whlist = whlist; |
1facf9fc | 8405 | + arg.flags = AuTestEmpty_WHONLY; |
dece6358 AM |
8406 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH)) |
8407 | + au_fset_testempty(arg.flags, SHWH); | |
1facf9fc | 8408 | + btail = au_dbtaildir(dentry); |
8409 | + for (bindex = au_dbstart(dentry); !err && bindex <= btail; bindex++) { | |
8410 | + struct dentry *h_dentry; | |
8411 | + | |
8412 | + h_dentry = au_h_dptr(dentry, bindex); | |
8413 | + if (h_dentry && h_dentry->d_inode) { | |
8414 | + arg.bindex = bindex; | |
8415 | + err = sio_test_empty(dentry, &arg); | |
8416 | + } | |
8417 | + } | |
8418 | + | |
8419 | + return err; | |
8420 | +} | |
8421 | + | |
8422 | +/* ---------------------------------------------------------------------- */ | |
8423 | + | |
8424 | +const struct file_operations aufs_dir_fop = { | |
4a4d8108 | 8425 | + .owner = THIS_MODULE, |
027c5e7a | 8426 | + .llseek = default_llseek, |
1facf9fc | 8427 | + .read = generic_read_dir, |
8428 | + .readdir = aufs_readdir, | |
8429 | + .unlocked_ioctl = aufs_ioctl_dir, | |
b752ccd1 AM |
8430 | +#ifdef CONFIG_COMPAT |
8431 | + .compat_ioctl = aufs_compat_ioctl_dir, | |
8432 | +#endif | |
1facf9fc | 8433 | + .open = aufs_open_dir, |
8434 | + .release = aufs_release_dir, | |
4a4d8108 | 8435 | + .flush = aufs_flush_dir, |
1facf9fc | 8436 | + .fsync = aufs_fsync_dir |
8437 | +}; | |
7f207e10 AM |
8438 | diff -urN /usr/share/empty/fs/aufs/dir.h linux/fs/aufs/dir.h |
8439 | --- /usr/share/empty/fs/aufs/dir.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 8440 | +++ linux/fs/aufs/dir.h 2011-08-24 13:30:24.731313534 +0200 |
b752ccd1 | 8441 | @@ -0,0 +1,138 @@ |
1facf9fc | 8442 | +/* |
027c5e7a | 8443 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 8444 | + * |
8445 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8446 | + * it under the terms of the GNU General Public License as published by | |
8447 | + * the Free Software Foundation; either version 2 of the License, or | |
8448 | + * (at your option) any later version. | |
dece6358 AM |
8449 | + * |
8450 | + * This program is distributed in the hope that it will be useful, | |
8451 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8452 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8453 | + * GNU General Public License for more details. | |
8454 | + * | |
8455 | + * You should have received a copy of the GNU General Public License | |
8456 | + * along with this program; if not, write to the Free Software | |
8457 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 8458 | + */ |
8459 | + | |
8460 | +/* | |
8461 | + * directory operations | |
8462 | + */ | |
8463 | + | |
8464 | +#ifndef __AUFS_DIR_H__ | |
8465 | +#define __AUFS_DIR_H__ | |
8466 | + | |
8467 | +#ifdef __KERNEL__ | |
8468 | + | |
8469 | +#include <linux/fs.h> | |
8470 | +#include <linux/aufs_type.h> | |
8471 | + | |
8472 | +/* ---------------------------------------------------------------------- */ | |
8473 | + | |
8474 | +/* need to be faster and smaller */ | |
8475 | + | |
8476 | +struct au_nhash { | |
dece6358 AM |
8477 | + unsigned int nh_num; |
8478 | + struct hlist_head *nh_head; | |
1facf9fc | 8479 | +}; |
8480 | + | |
8481 | +struct au_vdir_destr { | |
8482 | + unsigned char len; | |
8483 | + unsigned char name[0]; | |
8484 | +} __packed; | |
8485 | + | |
8486 | +struct au_vdir_dehstr { | |
8487 | + struct hlist_node hash; | |
8488 | + struct au_vdir_destr *str; | |
4a4d8108 | 8489 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 8490 | + |
8491 | +struct au_vdir_de { | |
8492 | + ino_t de_ino; | |
8493 | + unsigned char de_type; | |
8494 | + /* caution: packed */ | |
8495 | + struct au_vdir_destr de_str; | |
8496 | +} __packed; | |
8497 | + | |
8498 | +struct au_vdir_wh { | |
8499 | + struct hlist_node wh_hash; | |
dece6358 AM |
8500 | +#ifdef CONFIG_AUFS_SHWH |
8501 | + ino_t wh_ino; | |
1facf9fc | 8502 | + aufs_bindex_t wh_bindex; |
dece6358 AM |
8503 | + unsigned char wh_type; |
8504 | +#else | |
8505 | + aufs_bindex_t wh_bindex; | |
8506 | +#endif | |
8507 | + /* caution: packed */ | |
1facf9fc | 8508 | + struct au_vdir_destr wh_str; |
8509 | +} __packed; | |
8510 | + | |
8511 | +union au_vdir_deblk_p { | |
8512 | + unsigned char *deblk; | |
8513 | + struct au_vdir_de *de; | |
8514 | +}; | |
8515 | + | |
8516 | +struct au_vdir { | |
8517 | + unsigned char **vd_deblk; | |
8518 | + unsigned long vd_nblk; | |
1facf9fc | 8519 | + struct { |
8520 | + unsigned long ul; | |
8521 | + union au_vdir_deblk_p p; | |
8522 | + } vd_last; | |
8523 | + | |
8524 | + unsigned long vd_version; | |
dece6358 | 8525 | + unsigned int vd_deblk_sz; |
1facf9fc | 8526 | + unsigned long vd_jiffy; |
4a4d8108 | 8527 | +} ____cacheline_aligned_in_smp; |
1facf9fc | 8528 | + |
8529 | +/* ---------------------------------------------------------------------- */ | |
8530 | + | |
8531 | +/* dir.c */ | |
8532 | +extern const struct file_operations aufs_dir_fop; | |
8533 | +void au_add_nlink(struct inode *dir, struct inode *h_dir); | |
8534 | +void au_sub_nlink(struct inode *dir, struct inode *h_dir); | |
1308ab2a | 8535 | +loff_t au_dir_size(struct file *file, struct dentry *dentry); |
1facf9fc | 8536 | +int au_test_empty_lower(struct dentry *dentry); |
8537 | +int au_test_empty(struct dentry *dentry, struct au_nhash *whlist); | |
8538 | + | |
8539 | +/* vdir.c */ | |
1308ab2a | 8540 | +unsigned int au_rdhash_est(loff_t sz); |
dece6358 AM |
8541 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp); |
8542 | +void au_nhash_wh_free(struct au_nhash *whlist); | |
1facf9fc | 8543 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, |
8544 | + int limit); | |
dece6358 AM |
8545 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen); |
8546 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
8547 | + unsigned int d_type, aufs_bindex_t bindex, | |
8548 | + unsigned char shwh); | |
1facf9fc | 8549 | +void au_vdir_free(struct au_vdir *vdir); |
8550 | +int au_vdir_init(struct file *file); | |
8551 | +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir); | |
8552 | + | |
8553 | +/* ioctl.c */ | |
8554 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg); | |
8555 | + | |
1308ab2a | 8556 | +#ifdef CONFIG_AUFS_RDU |
8557 | +/* rdu.c */ | |
8558 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
8559 | +#ifdef CONFIG_COMPAT |
8560 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
8561 | + unsigned long arg); | |
8562 | +#endif | |
1308ab2a | 8563 | +#else |
8564 | +static inline long au_rdu_ioctl(struct file *file, unsigned int cmd, | |
8565 | + unsigned long arg) | |
8566 | +{ | |
8567 | + return -EINVAL; | |
8568 | +} | |
b752ccd1 AM |
8569 | +#ifdef CONFIG_COMPAT |
8570 | +static inline long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, | |
8571 | + unsigned long arg) | |
8572 | +{ | |
8573 | + return -EINVAL; | |
8574 | +} | |
8575 | +#endif | |
1308ab2a | 8576 | +#endif |
8577 | + | |
1facf9fc | 8578 | +#endif /* __KERNEL__ */ |
8579 | +#endif /* __AUFS_DIR_H__ */ | |
7f207e10 AM |
8580 | diff -urN /usr/share/empty/fs/aufs/dynop.c linux/fs/aufs/dynop.c |
8581 | --- /usr/share/empty/fs/aufs/dynop.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 8582 | +++ linux/fs/aufs/dynop.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 8583 | @@ -0,0 +1,377 @@ |
1facf9fc | 8584 | +/* |
027c5e7a | 8585 | + * Copyright (C) 2010-2011 Junjiro R. Okajima |
1facf9fc | 8586 | + * |
8587 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8588 | + * it under the terms of the GNU General Public License as published by | |
8589 | + * the Free Software Foundation; either version 2 of the License, or | |
8590 | + * (at your option) any later version. | |
dece6358 AM |
8591 | + * |
8592 | + * This program is distributed in the hope that it will be useful, | |
8593 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8594 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8595 | + * GNU General Public License for more details. | |
8596 | + * | |
8597 | + * You should have received a copy of the GNU General Public License | |
8598 | + * along with this program; if not, write to the Free Software | |
8599 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 8600 | + */ |
8601 | + | |
8602 | +/* | |
4a4d8108 | 8603 | + * dynamically customizable operations for regular files |
1facf9fc | 8604 | + */ |
8605 | + | |
1facf9fc | 8606 | +#include "aufs.h" |
8607 | + | |
4a4d8108 | 8608 | +#define DyPrSym(key) AuDbgSym(key->dk_op.dy_hop) |
1facf9fc | 8609 | + |
4a4d8108 AM |
8610 | +/* |
8611 | + * How large will these lists be? | |
8612 | + * Usually just a few elements, 20-30 at most for each, I guess. | |
8613 | + */ | |
8614 | +static struct au_splhead dynop[AuDyLast]; | |
8615 | + | |
8616 | +static struct au_dykey *dy_gfind_get(struct au_splhead *spl, const void *h_op) | |
1facf9fc | 8617 | +{ |
4a4d8108 AM |
8618 | + struct au_dykey *key, *tmp; |
8619 | + struct list_head *head; | |
1facf9fc | 8620 | + |
4a4d8108 AM |
8621 | + key = NULL; |
8622 | + head = &spl->head; | |
8623 | + rcu_read_lock(); | |
8624 | + list_for_each_entry_rcu(tmp, head, dk_list) | |
8625 | + if (tmp->dk_op.dy_hop == h_op) { | |
8626 | + key = tmp; | |
8627 | + kref_get(&key->dk_kref); | |
8628 | + break; | |
8629 | + } | |
8630 | + rcu_read_unlock(); | |
8631 | + | |
8632 | + return key; | |
1facf9fc | 8633 | +} |
8634 | + | |
4a4d8108 | 8635 | +static struct au_dykey *dy_bradd(struct au_branch *br, struct au_dykey *key) |
1facf9fc | 8636 | +{ |
4a4d8108 AM |
8637 | + struct au_dykey **k, *found; |
8638 | + const void *h_op = key->dk_op.dy_hop; | |
8639 | + int i; | |
1facf9fc | 8640 | + |
4a4d8108 AM |
8641 | + found = NULL; |
8642 | + k = br->br_dykey; | |
8643 | + for (i = 0; i < AuBrDynOp; i++) | |
8644 | + if (k[i]) { | |
8645 | + if (k[i]->dk_op.dy_hop == h_op) { | |
8646 | + found = k[i]; | |
8647 | + break; | |
8648 | + } | |
8649 | + } else | |
8650 | + break; | |
8651 | + if (!found) { | |
8652 | + spin_lock(&br->br_dykey_lock); | |
8653 | + for (; i < AuBrDynOp; i++) | |
8654 | + if (k[i]) { | |
8655 | + if (k[i]->dk_op.dy_hop == h_op) { | |
8656 | + found = k[i]; | |
8657 | + break; | |
8658 | + } | |
8659 | + } else { | |
8660 | + k[i] = key; | |
8661 | + break; | |
8662 | + } | |
8663 | + spin_unlock(&br->br_dykey_lock); | |
8664 | + BUG_ON(i == AuBrDynOp); /* expand the array */ | |
8665 | + } | |
8666 | + | |
8667 | + return found; | |
1facf9fc | 8668 | +} |
8669 | + | |
4a4d8108 AM |
8670 | +/* kref_get() if @key is already added */ |
8671 | +static struct au_dykey *dy_gadd(struct au_splhead *spl, struct au_dykey *key) | |
8672 | +{ | |
8673 | + struct au_dykey *tmp, *found; | |
8674 | + struct list_head *head; | |
8675 | + const void *h_op = key->dk_op.dy_hop; | |
1facf9fc | 8676 | + |
4a4d8108 AM |
8677 | + found = NULL; |
8678 | + head = &spl->head; | |
8679 | + spin_lock(&spl->spin); | |
8680 | + list_for_each_entry(tmp, head, dk_list) | |
8681 | + if (tmp->dk_op.dy_hop == h_op) { | |
8682 | + kref_get(&tmp->dk_kref); | |
8683 | + found = tmp; | |
8684 | + break; | |
8685 | + } | |
8686 | + if (!found) | |
8687 | + list_add_rcu(&key->dk_list, head); | |
8688 | + spin_unlock(&spl->spin); | |
1facf9fc | 8689 | + |
4a4d8108 AM |
8690 | + if (!found) |
8691 | + DyPrSym(key); | |
8692 | + return found; | |
8693 | +} | |
8694 | + | |
8695 | +static void dy_free_rcu(struct rcu_head *rcu) | |
1facf9fc | 8696 | +{ |
4a4d8108 AM |
8697 | + struct au_dykey *key; |
8698 | + | |
8699 | + key = container_of(rcu, struct au_dykey, dk_rcu); | |
8700 | + DyPrSym(key); | |
8701 | + kfree(key); | |
1facf9fc | 8702 | +} |
8703 | + | |
4a4d8108 AM |
8704 | +static void dy_free(struct kref *kref) |
8705 | +{ | |
8706 | + struct au_dykey *key; | |
8707 | + struct au_splhead *spl; | |
1facf9fc | 8708 | + |
4a4d8108 AM |
8709 | + key = container_of(kref, struct au_dykey, dk_kref); |
8710 | + spl = dynop + key->dk_op.dy_type; | |
8711 | + au_spl_del_rcu(&key->dk_list, spl); | |
8712 | + call_rcu(&key->dk_rcu, dy_free_rcu); | |
8713 | +} | |
8714 | + | |
8715 | +void au_dy_put(struct au_dykey *key) | |
1facf9fc | 8716 | +{ |
4a4d8108 AM |
8717 | + kref_put(&key->dk_kref, dy_free); |
8718 | +} | |
1facf9fc | 8719 | + |
4a4d8108 AM |
8720 | +/* ---------------------------------------------------------------------- */ |
8721 | + | |
8722 | +#define DyDbgSize(cnt, op) AuDebugOn(cnt != sizeof(op)/sizeof(void *)) | |
8723 | + | |
8724 | +#ifdef CONFIG_AUFS_DEBUG | |
8725 | +#define DyDbgDeclare(cnt) unsigned int cnt = 0 | |
4f0767ce | 8726 | +#define DyDbgInc(cnt) do { cnt++; } while (0) |
4a4d8108 AM |
8727 | +#else |
8728 | +#define DyDbgDeclare(cnt) do {} while (0) | |
8729 | +#define DyDbgInc(cnt) do {} while (0) | |
8730 | +#endif | |
8731 | + | |
8732 | +#define DySet(func, dst, src, h_op, h_sb) do { \ | |
8733 | + DyDbgInc(cnt); \ | |
8734 | + if (h_op->func) { \ | |
8735 | + if (src.func) \ | |
8736 | + dst.func = src.func; \ | |
8737 | + else \ | |
8738 | + AuDbg("%s %s\n", au_sbtype(h_sb), #func); \ | |
8739 | + } \ | |
8740 | +} while (0) | |
8741 | + | |
8742 | +#define DySetForce(func, dst, src) do { \ | |
8743 | + AuDebugOn(!src.func); \ | |
8744 | + DyDbgInc(cnt); \ | |
8745 | + dst.func = src.func; \ | |
8746 | +} while (0) | |
8747 | + | |
8748 | +#define DySetAop(func) \ | |
8749 | + DySet(func, dyaop->da_op, aufs_aop, h_aop, h_sb) | |
8750 | +#define DySetAopForce(func) \ | |
8751 | + DySetForce(func, dyaop->da_op, aufs_aop) | |
8752 | + | |
8753 | +static void dy_aop(struct au_dykey *key, const void *h_op, | |
8754 | + struct super_block *h_sb __maybe_unused) | |
8755 | +{ | |
8756 | + struct au_dyaop *dyaop = (void *)key; | |
8757 | + const struct address_space_operations *h_aop = h_op; | |
8758 | + DyDbgDeclare(cnt); | |
8759 | + | |
8760 | + AuDbg("%s\n", au_sbtype(h_sb)); | |
8761 | + | |
8762 | + DySetAop(writepage); | |
8763 | + DySetAopForce(readpage); /* force */ | |
4a4d8108 AM |
8764 | + DySetAop(writepages); |
8765 | + DySetAop(set_page_dirty); | |
8766 | + DySetAop(readpages); | |
8767 | + DySetAop(write_begin); | |
8768 | + DySetAop(write_end); | |
8769 | + DySetAop(bmap); | |
8770 | + DySetAop(invalidatepage); | |
8771 | + DySetAop(releasepage); | |
027c5e7a | 8772 | + DySetAop(freepage); |
4a4d8108 AM |
8773 | + /* these two will be changed according to an aufs mount option */ |
8774 | + DySetAop(direct_IO); | |
8775 | + DySetAop(get_xip_mem); | |
8776 | + DySetAop(migratepage); | |
8777 | + DySetAop(launder_page); | |
8778 | + DySetAop(is_partially_uptodate); | |
8779 | + DySetAop(error_remove_page); | |
8780 | + | |
8781 | + DyDbgSize(cnt, *h_aop); | |
8782 | + dyaop->da_get_xip_mem = h_aop->get_xip_mem; | |
8783 | +} | |
8784 | + | |
4a4d8108 AM |
8785 | +/* ---------------------------------------------------------------------- */ |
8786 | + | |
8787 | +static void dy_bug(struct kref *kref) | |
8788 | +{ | |
8789 | + BUG(); | |
8790 | +} | |
8791 | + | |
8792 | +static struct au_dykey *dy_get(struct au_dynop *op, struct au_branch *br) | |
8793 | +{ | |
8794 | + struct au_dykey *key, *old; | |
8795 | + struct au_splhead *spl; | |
b752ccd1 | 8796 | + struct op { |
4a4d8108 | 8797 | + unsigned int sz; |
b752ccd1 AM |
8798 | + void (*set)(struct au_dykey *key, const void *h_op, |
8799 | + struct super_block *h_sb __maybe_unused); | |
8800 | + }; | |
8801 | + static const struct op a[] = { | |
4a4d8108 AM |
8802 | + [AuDy_AOP] = { |
8803 | + .sz = sizeof(struct au_dyaop), | |
b752ccd1 | 8804 | + .set = dy_aop |
4a4d8108 | 8805 | + } |
b752ccd1 AM |
8806 | + }; |
8807 | + const struct op *p; | |
4a4d8108 AM |
8808 | + |
8809 | + spl = dynop + op->dy_type; | |
8810 | + key = dy_gfind_get(spl, op->dy_hop); | |
8811 | + if (key) | |
8812 | + goto out_add; /* success */ | |
8813 | + | |
8814 | + p = a + op->dy_type; | |
8815 | + key = kzalloc(p->sz, GFP_NOFS); | |
8816 | + if (unlikely(!key)) { | |
8817 | + key = ERR_PTR(-ENOMEM); | |
8818 | + goto out; | |
8819 | + } | |
8820 | + | |
8821 | + key->dk_op.dy_hop = op->dy_hop; | |
8822 | + kref_init(&key->dk_kref); | |
b752ccd1 | 8823 | + p->set(key, op->dy_hop, br->br_mnt->mnt_sb); |
4a4d8108 AM |
8824 | + old = dy_gadd(spl, key); |
8825 | + if (old) { | |
8826 | + kfree(key); | |
8827 | + key = old; | |
8828 | + } | |
8829 | + | |
8830 | +out_add: | |
8831 | + old = dy_bradd(br, key); | |
8832 | + if (old) | |
8833 | + /* its ref-count should never be zero here */ | |
8834 | + kref_put(&key->dk_kref, dy_bug); | |
8835 | +out: | |
8836 | + return key; | |
8837 | +} | |
8838 | + | |
8839 | +/* ---------------------------------------------------------------------- */ | |
8840 | +/* | |
8841 | + * Aufs prohibits O_DIRECT by defaut even if the branch supports it. | |
8842 | + * This behaviour is neccessary to return an error from open(O_DIRECT) instead | |
8843 | + * of the succeeding I/O. The dio mount option enables O_DIRECT and makes | |
8844 | + * open(O_DIRECT) always succeed, but the succeeding I/O may return an error. | |
8845 | + * See the aufs manual in detail. | |
8846 | + * | |
8847 | + * To keep this behaviour, aufs has to set NULL to ->get_xip_mem too, and the | |
8848 | + * performance of fadvise() and madvise() may be affected. | |
8849 | + */ | |
8850 | +static void dy_adx(struct au_dyaop *dyaop, int do_dx) | |
8851 | +{ | |
8852 | + if (!do_dx) { | |
8853 | + dyaop->da_op.direct_IO = NULL; | |
8854 | + dyaop->da_op.get_xip_mem = NULL; | |
8855 | + } else { | |
8856 | + dyaop->da_op.direct_IO = aufs_aop.direct_IO; | |
8857 | + dyaop->da_op.get_xip_mem = aufs_aop.get_xip_mem; | |
8858 | + if (!dyaop->da_get_xip_mem) | |
8859 | + dyaop->da_op.get_xip_mem = NULL; | |
8860 | + } | |
8861 | +} | |
8862 | + | |
8863 | +static struct au_dyaop *dy_aget(struct au_branch *br, | |
8864 | + const struct address_space_operations *h_aop, | |
8865 | + int do_dx) | |
8866 | +{ | |
8867 | + struct au_dyaop *dyaop; | |
8868 | + struct au_dynop op; | |
8869 | + | |
8870 | + op.dy_type = AuDy_AOP; | |
8871 | + op.dy_haop = h_aop; | |
8872 | + dyaop = (void *)dy_get(&op, br); | |
8873 | + if (IS_ERR(dyaop)) | |
8874 | + goto out; | |
8875 | + dy_adx(dyaop, do_dx); | |
8876 | + | |
8877 | +out: | |
8878 | + return dyaop; | |
8879 | +} | |
8880 | + | |
8881 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
8882 | + struct inode *h_inode) | |
8883 | +{ | |
8884 | + int err, do_dx; | |
8885 | + struct super_block *sb; | |
8886 | + struct au_branch *br; | |
8887 | + struct au_dyaop *dyaop; | |
8888 | + | |
8889 | + AuDebugOn(!S_ISREG(h_inode->i_mode)); | |
8890 | + IiMustWriteLock(inode); | |
8891 | + | |
8892 | + sb = inode->i_sb; | |
8893 | + br = au_sbr(sb, bindex); | |
8894 | + do_dx = !!au_opt_test(au_mntflags(sb), DIO); | |
8895 | + dyaop = dy_aget(br, h_inode->i_mapping->a_ops, do_dx); | |
8896 | + err = PTR_ERR(dyaop); | |
8897 | + if (IS_ERR(dyaop)) | |
8898 | + /* unnecessary to call dy_fput() */ | |
8899 | + goto out; | |
8900 | + | |
8901 | + err = 0; | |
8902 | + inode->i_mapping->a_ops = &dyaop->da_op; | |
8903 | + | |
8904 | +out: | |
8905 | + return err; | |
8906 | +} | |
8907 | + | |
b752ccd1 AM |
8908 | +/* |
8909 | + * Is it safe to replace a_ops during the inode/file is in operation? | |
8910 | + * Yes, I hope so. | |
8911 | + */ | |
8912 | +int au_dy_irefresh(struct inode *inode) | |
8913 | +{ | |
8914 | + int err; | |
8915 | + aufs_bindex_t bstart; | |
8916 | + struct inode *h_inode; | |
8917 | + | |
8918 | + err = 0; | |
8919 | + if (S_ISREG(inode->i_mode)) { | |
8920 | + bstart = au_ibstart(inode); | |
8921 | + h_inode = au_h_iptr(inode, bstart); | |
8922 | + err = au_dy_iaop(inode, bstart, h_inode); | |
8923 | + } | |
8924 | + return err; | |
8925 | +} | |
8926 | + | |
4a4d8108 AM |
8927 | +void au_dy_arefresh(int do_dx) |
8928 | +{ | |
8929 | + struct au_splhead *spl; | |
8930 | + struct list_head *head; | |
8931 | + struct au_dykey *key; | |
8932 | + | |
8933 | + spl = dynop + AuDy_AOP; | |
8934 | + head = &spl->head; | |
8935 | + spin_lock(&spl->spin); | |
8936 | + list_for_each_entry(key, head, dk_list) | |
8937 | + dy_adx((void *)key, do_dx); | |
8938 | + spin_unlock(&spl->spin); | |
8939 | +} | |
8940 | + | |
4a4d8108 AM |
8941 | +/* ---------------------------------------------------------------------- */ |
8942 | + | |
8943 | +void __init au_dy_init(void) | |
8944 | +{ | |
8945 | + int i; | |
8946 | + | |
8947 | + /* make sure that 'struct au_dykey *' can be any type */ | |
8948 | + BUILD_BUG_ON(offsetof(struct au_dyaop, da_key)); | |
4a4d8108 AM |
8949 | + |
8950 | + for (i = 0; i < AuDyLast; i++) | |
8951 | + au_spl_init(dynop + i); | |
8952 | +} | |
8953 | + | |
8954 | +void au_dy_fin(void) | |
8955 | +{ | |
8956 | + int i; | |
8957 | + | |
8958 | + for (i = 0; i < AuDyLast; i++) | |
8959 | + WARN_ON(!list_empty(&dynop[i].head)); | |
8960 | +} | |
7f207e10 AM |
8961 | diff -urN /usr/share/empty/fs/aufs/dynop.h linux/fs/aufs/dynop.h |
8962 | --- /usr/share/empty/fs/aufs/dynop.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 8963 | +++ linux/fs/aufs/dynop.h 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 8964 | @@ -0,0 +1,80 @@ |
4a4d8108 | 8965 | +/* |
027c5e7a | 8966 | + * Copyright (C) 2010-2011 Junjiro R. Okajima |
4a4d8108 AM |
8967 | + * |
8968 | + * This program, aufs is free software; you can redistribute it and/or modify | |
8969 | + * it under the terms of the GNU General Public License as published by | |
8970 | + * the Free Software Foundation; either version 2 of the License, or | |
8971 | + * (at your option) any later version. | |
8972 | + * | |
8973 | + * This program is distributed in the hope that it will be useful, | |
8974 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
8975 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
8976 | + * GNU General Public License for more details. | |
8977 | + * | |
8978 | + * You should have received a copy of the GNU General Public License | |
8979 | + * along with this program; if not, write to the Free Software | |
8980 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
8981 | + */ | |
8982 | + | |
8983 | +/* | |
8984 | + * dynamically customizable operations (for regular files only) | |
8985 | + */ | |
8986 | + | |
8987 | +#ifndef __AUFS_DYNOP_H__ | |
8988 | +#define __AUFS_DYNOP_H__ | |
8989 | + | |
8990 | +#ifdef __KERNEL__ | |
8991 | + | |
8992 | +#include <linux/fs.h> | |
8993 | +#include <linux/mm.h> | |
8994 | +#include <linux/rcupdate.h> | |
8995 | +#include <linux/aufs_type.h> | |
8996 | +#include "inode.h" | |
8997 | + | |
2cbb1c4b | 8998 | +enum {AuDy_AOP, AuDyLast}; |
4a4d8108 AM |
8999 | + |
9000 | +struct au_dynop { | |
9001 | + int dy_type; | |
9002 | + union { | |
9003 | + const void *dy_hop; | |
9004 | + const struct address_space_operations *dy_haop; | |
4a4d8108 AM |
9005 | + }; |
9006 | +}; | |
9007 | + | |
9008 | +struct au_dykey { | |
9009 | + union { | |
9010 | + struct list_head dk_list; | |
9011 | + struct rcu_head dk_rcu; | |
9012 | + }; | |
9013 | + struct au_dynop dk_op; | |
9014 | + | |
9015 | + /* | |
9016 | + * during I am in the branch local array, kref is gotten. when the | |
9017 | + * branch is removed, kref is put. | |
9018 | + */ | |
9019 | + struct kref dk_kref; | |
9020 | +}; | |
9021 | + | |
9022 | +/* stop unioning since their sizes are very different from each other */ | |
9023 | +struct au_dyaop { | |
9024 | + struct au_dykey da_key; | |
9025 | + struct address_space_operations da_op; /* not const */ | |
9026 | + int (*da_get_xip_mem)(struct address_space *, pgoff_t, int, | |
9027 | + void **, unsigned long *); | |
9028 | +}; | |
9029 | + | |
4a4d8108 AM |
9030 | +/* ---------------------------------------------------------------------- */ |
9031 | + | |
9032 | +/* dynop.c */ | |
9033 | +struct au_branch; | |
9034 | +void au_dy_put(struct au_dykey *key); | |
9035 | +int au_dy_iaop(struct inode *inode, aufs_bindex_t bindex, | |
9036 | + struct inode *h_inode); | |
b752ccd1 | 9037 | +int au_dy_irefresh(struct inode *inode); |
4a4d8108 | 9038 | +void au_dy_arefresh(int do_dio); |
4a4d8108 AM |
9039 | + |
9040 | +void __init au_dy_init(void); | |
9041 | +void au_dy_fin(void); | |
9042 | + | |
4a4d8108 AM |
9043 | +#endif /* __KERNEL__ */ |
9044 | +#endif /* __AUFS_DYNOP_H__ */ | |
7f207e10 AM |
9045 | diff -urN /usr/share/empty/fs/aufs/export.c linux/fs/aufs/export.c |
9046 | --- /usr/share/empty/fs/aufs/export.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 9047 | +++ linux/fs/aufs/export.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 9048 | @@ -0,0 +1,805 @@ |
4a4d8108 | 9049 | +/* |
027c5e7a | 9050 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
9051 | + * |
9052 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9053 | + * it under the terms of the GNU General Public License as published by | |
9054 | + * the Free Software Foundation; either version 2 of the License, or | |
9055 | + * (at your option) any later version. | |
9056 | + * | |
9057 | + * This program is distributed in the hope that it will be useful, | |
9058 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9059 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9060 | + * GNU General Public License for more details. | |
9061 | + * | |
9062 | + * You should have received a copy of the GNU General Public License | |
9063 | + * along with this program; if not, write to the Free Software | |
9064 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
9065 | + */ | |
9066 | + | |
9067 | +/* | |
9068 | + * export via nfs | |
9069 | + */ | |
9070 | + | |
9071 | +#include <linux/exportfs.h> | |
9072 | +#include <linux/file.h> | |
9073 | +#include <linux/mnt_namespace.h> | |
9074 | +#include <linux/namei.h> | |
9075 | +#include <linux/nsproxy.h> | |
9076 | +#include <linux/random.h> | |
9077 | +#include <linux/writeback.h> | |
9078 | +#include "aufs.h" | |
9079 | + | |
9080 | +union conv { | |
9081 | +#ifdef CONFIG_AUFS_INO_T_64 | |
9082 | + __u32 a[2]; | |
9083 | +#else | |
9084 | + __u32 a[1]; | |
9085 | +#endif | |
9086 | + ino_t ino; | |
9087 | +}; | |
9088 | + | |
9089 | +static ino_t decode_ino(__u32 *a) | |
9090 | +{ | |
9091 | + union conv u; | |
9092 | + | |
9093 | + BUILD_BUG_ON(sizeof(u.ino) != sizeof(u.a)); | |
9094 | + u.a[0] = a[0]; | |
9095 | +#ifdef CONFIG_AUFS_INO_T_64 | |
9096 | + u.a[1] = a[1]; | |
9097 | +#endif | |
9098 | + return u.ino; | |
9099 | +} | |
9100 | + | |
9101 | +static void encode_ino(__u32 *a, ino_t ino) | |
9102 | +{ | |
9103 | + union conv u; | |
9104 | + | |
9105 | + u.ino = ino; | |
9106 | + a[0] = u.a[0]; | |
9107 | +#ifdef CONFIG_AUFS_INO_T_64 | |
9108 | + a[1] = u.a[1]; | |
9109 | +#endif | |
9110 | +} | |
9111 | + | |
9112 | +/* NFS file handle */ | |
9113 | +enum { | |
9114 | + Fh_br_id, | |
9115 | + Fh_sigen, | |
9116 | +#ifdef CONFIG_AUFS_INO_T_64 | |
9117 | + /* support 64bit inode number */ | |
9118 | + Fh_ino1, | |
9119 | + Fh_ino2, | |
9120 | + Fh_dir_ino1, | |
9121 | + Fh_dir_ino2, | |
9122 | +#else | |
9123 | + Fh_ino1, | |
9124 | + Fh_dir_ino1, | |
9125 | +#endif | |
9126 | + Fh_igen, | |
9127 | + Fh_h_type, | |
9128 | + Fh_tail, | |
9129 | + | |
9130 | + Fh_ino = Fh_ino1, | |
9131 | + Fh_dir_ino = Fh_dir_ino1 | |
9132 | +}; | |
9133 | + | |
9134 | +static int au_test_anon(struct dentry *dentry) | |
9135 | +{ | |
027c5e7a | 9136 | + /* note: read d_flags without d_lock */ |
4a4d8108 AM |
9137 | + return !!(dentry->d_flags & DCACHE_DISCONNECTED); |
9138 | +} | |
9139 | + | |
9140 | +/* ---------------------------------------------------------------------- */ | |
9141 | +/* inode generation external table */ | |
9142 | + | |
b752ccd1 | 9143 | +void au_xigen_inc(struct inode *inode) |
4a4d8108 | 9144 | +{ |
4a4d8108 AM |
9145 | + loff_t pos; |
9146 | + ssize_t sz; | |
9147 | + __u32 igen; | |
9148 | + struct super_block *sb; | |
9149 | + struct au_sbinfo *sbinfo; | |
9150 | + | |
4a4d8108 | 9151 | + sb = inode->i_sb; |
b752ccd1 | 9152 | + AuDebugOn(!au_opt_test(au_mntflags(sb), XINO)); |
1facf9fc | 9153 | + |
b752ccd1 | 9154 | + sbinfo = au_sbi(sb); |
1facf9fc | 9155 | + pos = inode->i_ino; |
9156 | + pos *= sizeof(igen); | |
9157 | + igen = inode->i_generation + 1; | |
1facf9fc | 9158 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xigen, &igen, |
9159 | + sizeof(igen), &pos); | |
9160 | + if (sz == sizeof(igen)) | |
b752ccd1 | 9161 | + return; /* success */ |
1facf9fc | 9162 | + |
b752ccd1 | 9163 | + if (unlikely(sz >= 0)) |
1facf9fc | 9164 | + AuIOErr("xigen error (%zd)\n", sz); |
1facf9fc | 9165 | +} |
9166 | + | |
9167 | +int au_xigen_new(struct inode *inode) | |
9168 | +{ | |
9169 | + int err; | |
9170 | + loff_t pos; | |
9171 | + ssize_t sz; | |
9172 | + struct super_block *sb; | |
9173 | + struct au_sbinfo *sbinfo; | |
9174 | + struct file *file; | |
9175 | + | |
9176 | + err = 0; | |
9177 | + /* todo: dirty, at mount time */ | |
9178 | + if (inode->i_ino == AUFS_ROOT_INO) | |
9179 | + goto out; | |
9180 | + sb = inode->i_sb; | |
dece6358 | 9181 | + SiMustAnyLock(sb); |
1facf9fc | 9182 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) |
9183 | + goto out; | |
9184 | + | |
9185 | + err = -EFBIG; | |
9186 | + pos = inode->i_ino; | |
9187 | + if (unlikely(au_loff_max / sizeof(inode->i_generation) - 1 < pos)) { | |
9188 | + AuIOErr1("too large i%lld\n", pos); | |
9189 | + goto out; | |
9190 | + } | |
9191 | + pos *= sizeof(inode->i_generation); | |
9192 | + | |
9193 | + err = 0; | |
9194 | + sbinfo = au_sbi(sb); | |
9195 | + file = sbinfo->si_xigen; | |
9196 | + BUG_ON(!file); | |
9197 | + | |
9198 | + if (i_size_read(file->f_dentry->d_inode) | |
9199 | + < pos + sizeof(inode->i_generation)) { | |
9200 | + inode->i_generation = atomic_inc_return(&sbinfo->si_xigen_next); | |
9201 | + sz = xino_fwrite(sbinfo->si_xwrite, file, &inode->i_generation, | |
9202 | + sizeof(inode->i_generation), &pos); | |
9203 | + } else | |
9204 | + sz = xino_fread(sbinfo->si_xread, file, &inode->i_generation, | |
9205 | + sizeof(inode->i_generation), &pos); | |
9206 | + if (sz == sizeof(inode->i_generation)) | |
9207 | + goto out; /* success */ | |
9208 | + | |
9209 | + err = sz; | |
9210 | + if (unlikely(sz >= 0)) { | |
9211 | + err = -EIO; | |
9212 | + AuIOErr("xigen error (%zd)\n", sz); | |
9213 | + } | |
9214 | + | |
4f0767ce | 9215 | +out: |
1facf9fc | 9216 | + return err; |
9217 | +} | |
9218 | + | |
9219 | +int au_xigen_set(struct super_block *sb, struct file *base) | |
9220 | +{ | |
9221 | + int err; | |
9222 | + struct au_sbinfo *sbinfo; | |
9223 | + struct file *file; | |
9224 | + | |
dece6358 AM |
9225 | + SiMustWriteLock(sb); |
9226 | + | |
1facf9fc | 9227 | + sbinfo = au_sbi(sb); |
9228 | + file = au_xino_create2(base, sbinfo->si_xigen); | |
9229 | + err = PTR_ERR(file); | |
9230 | + if (IS_ERR(file)) | |
9231 | + goto out; | |
9232 | + err = 0; | |
9233 | + if (sbinfo->si_xigen) | |
9234 | + fput(sbinfo->si_xigen); | |
9235 | + sbinfo->si_xigen = file; | |
9236 | + | |
4f0767ce | 9237 | +out: |
1facf9fc | 9238 | + return err; |
9239 | +} | |
9240 | + | |
9241 | +void au_xigen_clr(struct super_block *sb) | |
9242 | +{ | |
9243 | + struct au_sbinfo *sbinfo; | |
9244 | + | |
dece6358 AM |
9245 | + SiMustWriteLock(sb); |
9246 | + | |
1facf9fc | 9247 | + sbinfo = au_sbi(sb); |
9248 | + if (sbinfo->si_xigen) { | |
9249 | + fput(sbinfo->si_xigen); | |
9250 | + sbinfo->si_xigen = NULL; | |
9251 | + } | |
9252 | +} | |
9253 | + | |
9254 | +/* ---------------------------------------------------------------------- */ | |
9255 | + | |
9256 | +static struct dentry *decode_by_ino(struct super_block *sb, ino_t ino, | |
9257 | + ino_t dir_ino) | |
9258 | +{ | |
9259 | + struct dentry *dentry, *d; | |
9260 | + struct inode *inode; | |
9261 | + unsigned int sigen; | |
9262 | + | |
9263 | + dentry = NULL; | |
9264 | + inode = ilookup(sb, ino); | |
9265 | + if (!inode) | |
9266 | + goto out; | |
9267 | + | |
9268 | + dentry = ERR_PTR(-ESTALE); | |
9269 | + sigen = au_sigen(sb); | |
9270 | + if (unlikely(is_bad_inode(inode) | |
9271 | + || IS_DEADDIR(inode) | |
9272 | + || sigen != au_iigen(inode))) | |
9273 | + goto out_iput; | |
9274 | + | |
9275 | + dentry = NULL; | |
9276 | + if (!dir_ino || S_ISDIR(inode->i_mode)) | |
9277 | + dentry = d_find_alias(inode); | |
9278 | + else { | |
027c5e7a AM |
9279 | + spin_lock(&inode->i_lock); |
9280 | + list_for_each_entry(d, &inode->i_dentry, d_alias) { | |
9281 | + spin_lock(&d->d_lock); | |
1facf9fc | 9282 | + if (!au_test_anon(d) |
9283 | + && d->d_parent->d_inode->i_ino == dir_ino) { | |
027c5e7a AM |
9284 | + dentry = dget_dlock(d); |
9285 | + spin_unlock(&d->d_lock); | |
1facf9fc | 9286 | + break; |
9287 | + } | |
027c5e7a AM |
9288 | + spin_unlock(&d->d_lock); |
9289 | + } | |
9290 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 9291 | + } |
027c5e7a | 9292 | + if (unlikely(dentry && au_digen_test(dentry, sigen))) { |
2cbb1c4b | 9293 | + /* need to refresh */ |
1facf9fc | 9294 | + dput(dentry); |
2cbb1c4b | 9295 | + dentry = NULL; |
1facf9fc | 9296 | + } |
9297 | + | |
4f0767ce | 9298 | +out_iput: |
1facf9fc | 9299 | + iput(inode); |
4f0767ce | 9300 | +out: |
2cbb1c4b | 9301 | + AuTraceErrPtr(dentry); |
1facf9fc | 9302 | + return dentry; |
9303 | +} | |
9304 | + | |
9305 | +/* ---------------------------------------------------------------------- */ | |
9306 | + | |
9307 | +/* todo: dirty? */ | |
9308 | +/* if exportfs_decode_fh() passed vfsmount*, we could be happy */ | |
4a4d8108 AM |
9309 | + |
9310 | +struct au_compare_mnt_args { | |
9311 | + /* input */ | |
9312 | + struct super_block *sb; | |
9313 | + | |
9314 | + /* output */ | |
9315 | + struct vfsmount *mnt; | |
9316 | +}; | |
9317 | + | |
9318 | +static int au_compare_mnt(struct vfsmount *mnt, void *arg) | |
9319 | +{ | |
9320 | + struct au_compare_mnt_args *a = arg; | |
9321 | + | |
9322 | + if (mnt->mnt_sb != a->sb) | |
9323 | + return 0; | |
9324 | + a->mnt = mntget(mnt); | |
9325 | + return 1; | |
9326 | +} | |
9327 | + | |
1facf9fc | 9328 | +static struct vfsmount *au_mnt_get(struct super_block *sb) |
9329 | +{ | |
4a4d8108 AM |
9330 | + int err; |
9331 | + struct au_compare_mnt_args args = { | |
9332 | + .sb = sb | |
9333 | + }; | |
1facf9fc | 9334 | + struct mnt_namespace *ns; |
1facf9fc | 9335 | + |
0c5527e5 | 9336 | + br_read_lock(vfsmount_lock); |
1facf9fc | 9337 | + /* no get/put ?? */ |
9338 | + AuDebugOn(!current->nsproxy); | |
9339 | + ns = current->nsproxy->mnt_ns; | |
9340 | + AuDebugOn(!ns); | |
4a4d8108 | 9341 | + err = iterate_mounts(au_compare_mnt, &args, ns->root); |
0c5527e5 | 9342 | + br_read_unlock(vfsmount_lock); |
4a4d8108 AM |
9343 | + AuDebugOn(!err); |
9344 | + AuDebugOn(!args.mnt); | |
9345 | + return args.mnt; | |
1facf9fc | 9346 | +} |
9347 | + | |
9348 | +struct au_nfsd_si_lock { | |
4a4d8108 | 9349 | + unsigned int sigen; |
027c5e7a | 9350 | + aufs_bindex_t bindex, br_id; |
1facf9fc | 9351 | + unsigned char force_lock; |
9352 | +}; | |
9353 | + | |
027c5e7a AM |
9354 | +static int si_nfsd_read_lock(struct super_block *sb, |
9355 | + struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 9356 | +{ |
027c5e7a | 9357 | + int err; |
1facf9fc | 9358 | + aufs_bindex_t bindex; |
9359 | + | |
9360 | + si_read_lock(sb, AuLock_FLUSH); | |
9361 | + | |
9362 | + /* branch id may be wrapped around */ | |
027c5e7a | 9363 | + err = 0; |
1facf9fc | 9364 | + bindex = au_br_index(sb, nsi_lock->br_id); |
9365 | + if (bindex >= 0 && nsi_lock->sigen + AUFS_BRANCH_MAX > au_sigen(sb)) | |
9366 | + goto out; /* success */ | |
9367 | + | |
027c5e7a AM |
9368 | + err = -ESTALE; |
9369 | + bindex = -1; | |
1facf9fc | 9370 | + if (!nsi_lock->force_lock) |
9371 | + si_read_unlock(sb); | |
1facf9fc | 9372 | + |
4f0767ce | 9373 | +out: |
027c5e7a AM |
9374 | + nsi_lock->bindex = bindex; |
9375 | + return err; | |
1facf9fc | 9376 | +} |
9377 | + | |
9378 | +struct find_name_by_ino { | |
9379 | + int called, found; | |
9380 | + ino_t ino; | |
9381 | + char *name; | |
9382 | + int namelen; | |
9383 | +}; | |
9384 | + | |
9385 | +static int | |
9386 | +find_name_by_ino(void *arg, const char *name, int namelen, loff_t offset, | |
9387 | + u64 ino, unsigned int d_type) | |
9388 | +{ | |
9389 | + struct find_name_by_ino *a = arg; | |
9390 | + | |
9391 | + a->called++; | |
9392 | + if (a->ino != ino) | |
9393 | + return 0; | |
9394 | + | |
9395 | + memcpy(a->name, name, namelen); | |
9396 | + a->namelen = namelen; | |
9397 | + a->found = 1; | |
9398 | + return 1; | |
9399 | +} | |
9400 | + | |
9401 | +static struct dentry *au_lkup_by_ino(struct path *path, ino_t ino, | |
9402 | + struct au_nfsd_si_lock *nsi_lock) | |
9403 | +{ | |
9404 | + struct dentry *dentry, *parent; | |
9405 | + struct file *file; | |
9406 | + struct inode *dir; | |
9407 | + struct find_name_by_ino arg; | |
9408 | + int err; | |
9409 | + | |
9410 | + parent = path->dentry; | |
9411 | + if (nsi_lock) | |
9412 | + si_read_unlock(parent->d_sb); | |
4a4d8108 | 9413 | + file = vfsub_dentry_open(path, au_dir_roflags); |
1facf9fc | 9414 | + dentry = (void *)file; |
9415 | + if (IS_ERR(file)) | |
9416 | + goto out; | |
9417 | + | |
9418 | + dentry = ERR_PTR(-ENOMEM); | |
4a4d8108 | 9419 | + arg.name = __getname_gfp(GFP_NOFS); |
1facf9fc | 9420 | + if (unlikely(!arg.name)) |
9421 | + goto out_file; | |
9422 | + arg.ino = ino; | |
9423 | + arg.found = 0; | |
9424 | + do { | |
9425 | + arg.called = 0; | |
9426 | + /* smp_mb(); */ | |
9427 | + err = vfsub_readdir(file, find_name_by_ino, &arg); | |
9428 | + } while (!err && !arg.found && arg.called); | |
9429 | + dentry = ERR_PTR(err); | |
9430 | + if (unlikely(err)) | |
9431 | + goto out_name; | |
9432 | + dentry = ERR_PTR(-ENOENT); | |
9433 | + if (!arg.found) | |
9434 | + goto out_name; | |
9435 | + | |
9436 | + /* do not call au_lkup_one() */ | |
9437 | + dir = parent->d_inode; | |
9438 | + mutex_lock(&dir->i_mutex); | |
9439 | + dentry = vfsub_lookup_one_len(arg.name, parent, arg.namelen); | |
9440 | + mutex_unlock(&dir->i_mutex); | |
9441 | + AuTraceErrPtr(dentry); | |
9442 | + if (IS_ERR(dentry)) | |
9443 | + goto out_name; | |
9444 | + AuDebugOn(au_test_anon(dentry)); | |
9445 | + if (unlikely(!dentry->d_inode)) { | |
9446 | + dput(dentry); | |
9447 | + dentry = ERR_PTR(-ENOENT); | |
9448 | + } | |
9449 | + | |
4f0767ce | 9450 | +out_name: |
1facf9fc | 9451 | + __putname(arg.name); |
4f0767ce | 9452 | +out_file: |
1facf9fc | 9453 | + fput(file); |
4f0767ce | 9454 | +out: |
1facf9fc | 9455 | + if (unlikely(nsi_lock |
9456 | + && si_nfsd_read_lock(parent->d_sb, nsi_lock) < 0)) | |
9457 | + if (!IS_ERR(dentry)) { | |
9458 | + dput(dentry); | |
9459 | + dentry = ERR_PTR(-ESTALE); | |
9460 | + } | |
9461 | + AuTraceErrPtr(dentry); | |
9462 | + return dentry; | |
9463 | +} | |
9464 | + | |
9465 | +static struct dentry *decode_by_dir_ino(struct super_block *sb, ino_t ino, | |
9466 | + ino_t dir_ino, | |
9467 | + struct au_nfsd_si_lock *nsi_lock) | |
9468 | +{ | |
9469 | + struct dentry *dentry; | |
9470 | + struct path path; | |
9471 | + | |
9472 | + if (dir_ino != AUFS_ROOT_INO) { | |
9473 | + path.dentry = decode_by_ino(sb, dir_ino, 0); | |
9474 | + dentry = path.dentry; | |
9475 | + if (!path.dentry || IS_ERR(path.dentry)) | |
9476 | + goto out; | |
9477 | + AuDebugOn(au_test_anon(path.dentry)); | |
9478 | + } else | |
9479 | + path.dentry = dget(sb->s_root); | |
9480 | + | |
9481 | + path.mnt = au_mnt_get(sb); | |
9482 | + dentry = au_lkup_by_ino(&path, ino, nsi_lock); | |
9483 | + path_put(&path); | |
9484 | + | |
4f0767ce | 9485 | +out: |
1facf9fc | 9486 | + AuTraceErrPtr(dentry); |
9487 | + return dentry; | |
9488 | +} | |
9489 | + | |
9490 | +/* ---------------------------------------------------------------------- */ | |
9491 | + | |
9492 | +static int h_acceptable(void *expv, struct dentry *dentry) | |
9493 | +{ | |
9494 | + return 1; | |
9495 | +} | |
9496 | + | |
9497 | +static char *au_build_path(struct dentry *h_parent, struct path *h_rootpath, | |
9498 | + char *buf, int len, struct super_block *sb) | |
9499 | +{ | |
9500 | + char *p; | |
9501 | + int n; | |
9502 | + struct path path; | |
9503 | + | |
9504 | + p = d_path(h_rootpath, buf, len); | |
9505 | + if (IS_ERR(p)) | |
9506 | + goto out; | |
9507 | + n = strlen(p); | |
9508 | + | |
9509 | + path.mnt = h_rootpath->mnt; | |
9510 | + path.dentry = h_parent; | |
9511 | + p = d_path(&path, buf, len); | |
9512 | + if (IS_ERR(p)) | |
9513 | + goto out; | |
9514 | + if (n != 1) | |
9515 | + p += n; | |
9516 | + | |
9517 | + path.mnt = au_mnt_get(sb); | |
9518 | + path.dentry = sb->s_root; | |
9519 | + p = d_path(&path, buf, len - strlen(p)); | |
9520 | + mntput(path.mnt); | |
9521 | + if (IS_ERR(p)) | |
9522 | + goto out; | |
9523 | + if (n != 1) | |
9524 | + p[strlen(p)] = '/'; | |
9525 | + | |
4f0767ce | 9526 | +out: |
1facf9fc | 9527 | + AuTraceErrPtr(p); |
9528 | + return p; | |
9529 | +} | |
9530 | + | |
9531 | +static | |
027c5e7a AM |
9532 | +struct dentry *decode_by_path(struct super_block *sb, ino_t ino, __u32 *fh, |
9533 | + int fh_len, struct au_nfsd_si_lock *nsi_lock) | |
1facf9fc | 9534 | +{ |
9535 | + struct dentry *dentry, *h_parent, *root; | |
9536 | + struct super_block *h_sb; | |
9537 | + char *pathname, *p; | |
9538 | + struct vfsmount *h_mnt; | |
9539 | + struct au_branch *br; | |
9540 | + int err; | |
9541 | + struct path path; | |
9542 | + | |
027c5e7a | 9543 | + br = au_sbr(sb, nsi_lock->bindex); |
1facf9fc | 9544 | + h_mnt = br->br_mnt; |
9545 | + h_sb = h_mnt->mnt_sb; | |
9546 | + /* todo: call lower fh_to_dentry()? fh_to_parent()? */ | |
9547 | + h_parent = exportfs_decode_fh(h_mnt, (void *)(fh + Fh_tail), | |
9548 | + fh_len - Fh_tail, fh[Fh_h_type], | |
9549 | + h_acceptable, /*context*/NULL); | |
9550 | + dentry = h_parent; | |
9551 | + if (unlikely(!h_parent || IS_ERR(h_parent))) { | |
9552 | + AuWarn1("%s decode_fh failed, %ld\n", | |
9553 | + au_sbtype(h_sb), PTR_ERR(h_parent)); | |
9554 | + goto out; | |
9555 | + } | |
9556 | + dentry = NULL; | |
9557 | + if (unlikely(au_test_anon(h_parent))) { | |
9558 | + AuWarn1("%s decode_fh returned a disconnected dentry\n", | |
9559 | + au_sbtype(h_sb)); | |
9560 | + goto out_h_parent; | |
9561 | + } | |
9562 | + | |
9563 | + dentry = ERR_PTR(-ENOMEM); | |
9564 | + pathname = (void *)__get_free_page(GFP_NOFS); | |
9565 | + if (unlikely(!pathname)) | |
9566 | + goto out_h_parent; | |
9567 | + | |
9568 | + root = sb->s_root; | |
9569 | + path.mnt = h_mnt; | |
9570 | + di_read_lock_parent(root, !AuLock_IR); | |
027c5e7a | 9571 | + path.dentry = au_h_dptr(root, nsi_lock->bindex); |
1facf9fc | 9572 | + di_read_unlock(root, !AuLock_IR); |
9573 | + p = au_build_path(h_parent, &path, pathname, PAGE_SIZE, sb); | |
9574 | + dentry = (void *)p; | |
9575 | + if (IS_ERR(p)) | |
9576 | + goto out_pathname; | |
9577 | + | |
9578 | + si_read_unlock(sb); | |
9579 | + err = vfsub_kern_path(p, LOOKUP_FOLLOW | LOOKUP_DIRECTORY, &path); | |
9580 | + dentry = ERR_PTR(err); | |
9581 | + if (unlikely(err)) | |
9582 | + goto out_relock; | |
9583 | + | |
9584 | + dentry = ERR_PTR(-ENOENT); | |
9585 | + AuDebugOn(au_test_anon(path.dentry)); | |
9586 | + if (unlikely(!path.dentry->d_inode)) | |
9587 | + goto out_path; | |
9588 | + | |
9589 | + if (ino != path.dentry->d_inode->i_ino) | |
9590 | + dentry = au_lkup_by_ino(&path, ino, /*nsi_lock*/NULL); | |
9591 | + else | |
9592 | + dentry = dget(path.dentry); | |
9593 | + | |
4f0767ce | 9594 | +out_path: |
1facf9fc | 9595 | + path_put(&path); |
4f0767ce | 9596 | +out_relock: |
1facf9fc | 9597 | + if (unlikely(si_nfsd_read_lock(sb, nsi_lock) < 0)) |
9598 | + if (!IS_ERR(dentry)) { | |
9599 | + dput(dentry); | |
9600 | + dentry = ERR_PTR(-ESTALE); | |
9601 | + } | |
4f0767ce | 9602 | +out_pathname: |
1facf9fc | 9603 | + free_page((unsigned long)pathname); |
4f0767ce | 9604 | +out_h_parent: |
1facf9fc | 9605 | + dput(h_parent); |
4f0767ce | 9606 | +out: |
1facf9fc | 9607 | + AuTraceErrPtr(dentry); |
9608 | + return dentry; | |
9609 | +} | |
9610 | + | |
9611 | +/* ---------------------------------------------------------------------- */ | |
9612 | + | |
9613 | +static struct dentry * | |
9614 | +aufs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, | |
9615 | + int fh_type) | |
9616 | +{ | |
9617 | + struct dentry *dentry; | |
9618 | + __u32 *fh = fid->raw; | |
027c5e7a | 9619 | + struct au_branch *br; |
1facf9fc | 9620 | + ino_t ino, dir_ino; |
1facf9fc | 9621 | + struct au_nfsd_si_lock nsi_lock = { |
1facf9fc | 9622 | + .force_lock = 0 |
9623 | + }; | |
9624 | + | |
1facf9fc | 9625 | + dentry = ERR_PTR(-ESTALE); |
4a4d8108 AM |
9626 | + /* it should never happen, but the file handle is unreliable */ |
9627 | + if (unlikely(fh_len < Fh_tail)) | |
9628 | + goto out; | |
9629 | + nsi_lock.sigen = fh[Fh_sigen]; | |
9630 | + nsi_lock.br_id = fh[Fh_br_id]; | |
9631 | + | |
1facf9fc | 9632 | + /* branch id may be wrapped around */ |
027c5e7a AM |
9633 | + br = NULL; |
9634 | + if (unlikely(si_nfsd_read_lock(sb, &nsi_lock))) | |
1facf9fc | 9635 | + goto out; |
9636 | + nsi_lock.force_lock = 1; | |
9637 | + | |
9638 | + /* is this inode still cached? */ | |
9639 | + ino = decode_ino(fh + Fh_ino); | |
4a4d8108 AM |
9640 | + /* it should never happen */ |
9641 | + if (unlikely(ino == AUFS_ROOT_INO)) | |
9642 | + goto out; | |
9643 | + | |
1facf9fc | 9644 | + dir_ino = decode_ino(fh + Fh_dir_ino); |
9645 | + dentry = decode_by_ino(sb, ino, dir_ino); | |
9646 | + if (IS_ERR(dentry)) | |
9647 | + goto out_unlock; | |
9648 | + if (dentry) | |
9649 | + goto accept; | |
9650 | + | |
9651 | + /* is the parent dir cached? */ | |
027c5e7a AM |
9652 | + br = au_sbr(sb, nsi_lock.bindex); |
9653 | + atomic_inc(&br->br_count); | |
1facf9fc | 9654 | + dentry = decode_by_dir_ino(sb, ino, dir_ino, &nsi_lock); |
9655 | + if (IS_ERR(dentry)) | |
9656 | + goto out_unlock; | |
9657 | + if (dentry) | |
9658 | + goto accept; | |
9659 | + | |
9660 | + /* lookup path */ | |
027c5e7a | 9661 | + dentry = decode_by_path(sb, ino, fh, fh_len, &nsi_lock); |
1facf9fc | 9662 | + if (IS_ERR(dentry)) |
9663 | + goto out_unlock; | |
9664 | + if (unlikely(!dentry)) | |
9665 | + /* todo?: make it ESTALE */ | |
9666 | + goto out_unlock; | |
9667 | + | |
4f0767ce | 9668 | +accept: |
027c5e7a AM |
9669 | + if (!au_digen_test(dentry, au_sigen(sb)) |
9670 | + && dentry->d_inode->i_generation == fh[Fh_igen]) | |
1facf9fc | 9671 | + goto out_unlock; /* success */ |
9672 | + | |
9673 | + dput(dentry); | |
9674 | + dentry = ERR_PTR(-ESTALE); | |
4f0767ce | 9675 | +out_unlock: |
027c5e7a AM |
9676 | + if (br) |
9677 | + atomic_dec(&br->br_count); | |
1facf9fc | 9678 | + si_read_unlock(sb); |
4f0767ce | 9679 | +out: |
1facf9fc | 9680 | + AuTraceErrPtr(dentry); |
9681 | + return dentry; | |
9682 | +} | |
9683 | + | |
9684 | +#if 0 /* reserved for future use */ | |
9685 | +/* support subtreecheck option */ | |
9686 | +static struct dentry *aufs_fh_to_parent(struct super_block *sb, struct fid *fid, | |
9687 | + int fh_len, int fh_type) | |
9688 | +{ | |
9689 | + struct dentry *parent; | |
9690 | + __u32 *fh = fid->raw; | |
9691 | + ino_t dir_ino; | |
9692 | + | |
9693 | + dir_ino = decode_ino(fh + Fh_dir_ino); | |
9694 | + parent = decode_by_ino(sb, dir_ino, 0); | |
9695 | + if (IS_ERR(parent)) | |
9696 | + goto out; | |
9697 | + if (!parent) | |
9698 | + parent = decode_by_path(sb, au_br_index(sb, fh[Fh_br_id]), | |
9699 | + dir_ino, fh, fh_len); | |
9700 | + | |
4f0767ce | 9701 | +out: |
1facf9fc | 9702 | + AuTraceErrPtr(parent); |
9703 | + return parent; | |
9704 | +} | |
9705 | +#endif | |
9706 | + | |
9707 | +/* ---------------------------------------------------------------------- */ | |
9708 | + | |
9709 | +static int aufs_encode_fh(struct dentry *dentry, __u32 *fh, int *max_len, | |
9710 | + int connectable) | |
9711 | +{ | |
9712 | + int err; | |
9713 | + aufs_bindex_t bindex, bend; | |
9714 | + struct super_block *sb, *h_sb; | |
9715 | + struct inode *inode; | |
9716 | + struct dentry *parent, *h_parent; | |
9717 | + struct au_branch *br; | |
9718 | + | |
9719 | + AuDebugOn(au_test_anon(dentry)); | |
9720 | + | |
9721 | + parent = NULL; | |
9722 | + err = -ENOSPC; | |
9723 | + if (unlikely(*max_len <= Fh_tail)) { | |
9724 | + AuWarn1("NFSv2 client (max_len %d)?\n", *max_len); | |
9725 | + goto out; | |
9726 | + } | |
9727 | + | |
9728 | + err = FILEID_ROOT; | |
9729 | + if (IS_ROOT(dentry)) { | |
9730 | + AuDebugOn(dentry->d_inode->i_ino != AUFS_ROOT_INO); | |
9731 | + goto out; | |
9732 | + } | |
9733 | + | |
1facf9fc | 9734 | + h_parent = NULL; |
027c5e7a AM |
9735 | + err = aufs_read_lock(dentry, AuLock_FLUSH | AuLock_IR | AuLock_GEN); |
9736 | + if (unlikely(err)) | |
9737 | + goto out; | |
9738 | + | |
1facf9fc | 9739 | + inode = dentry->d_inode; |
9740 | + AuDebugOn(!inode); | |
027c5e7a | 9741 | + sb = dentry->d_sb; |
1facf9fc | 9742 | +#ifdef CONFIG_AUFS_DEBUG |
9743 | + if (unlikely(!au_opt_test(au_mntflags(sb), XINO))) | |
9744 | + AuWarn1("NFS-exporting requires xino\n"); | |
9745 | +#endif | |
027c5e7a AM |
9746 | + err = -EIO; |
9747 | + parent = dget_parent(dentry); | |
9748 | + di_read_lock_parent(parent, !AuLock_IR); | |
1facf9fc | 9749 | + bend = au_dbtaildir(parent); |
9750 | + for (bindex = au_dbstart(parent); bindex <= bend; bindex++) { | |
9751 | + h_parent = au_h_dptr(parent, bindex); | |
9752 | + if (h_parent) { | |
9753 | + dget(h_parent); | |
9754 | + break; | |
9755 | + } | |
9756 | + } | |
9757 | + if (unlikely(!h_parent)) | |
9758 | + goto out_unlock; | |
9759 | + | |
9760 | + err = -EPERM; | |
9761 | + br = au_sbr(sb, bindex); | |
9762 | + h_sb = br->br_mnt->mnt_sb; | |
9763 | + if (unlikely(!h_sb->s_export_op)) { | |
9764 | + AuErr1("%s branch is not exportable\n", au_sbtype(h_sb)); | |
9765 | + goto out_dput; | |
9766 | + } | |
9767 | + | |
9768 | + fh[Fh_br_id] = br->br_id; | |
9769 | + fh[Fh_sigen] = au_sigen(sb); | |
9770 | + encode_ino(fh + Fh_ino, inode->i_ino); | |
9771 | + encode_ino(fh + Fh_dir_ino, parent->d_inode->i_ino); | |
9772 | + fh[Fh_igen] = inode->i_generation; | |
9773 | + | |
9774 | + *max_len -= Fh_tail; | |
9775 | + fh[Fh_h_type] = exportfs_encode_fh(h_parent, (void *)(fh + Fh_tail), | |
9776 | + max_len, | |
9777 | + /*connectable or subtreecheck*/0); | |
9778 | + err = fh[Fh_h_type]; | |
9779 | + *max_len += Fh_tail; | |
9780 | + /* todo: macros? */ | |
9781 | + if (err != 255) | |
9782 | + err = 99; | |
9783 | + else | |
9784 | + AuWarn1("%s encode_fh failed\n", au_sbtype(h_sb)); | |
9785 | + | |
4f0767ce | 9786 | +out_dput: |
1facf9fc | 9787 | + dput(h_parent); |
4f0767ce | 9788 | +out_unlock: |
1facf9fc | 9789 | + di_read_unlock(parent, !AuLock_IR); |
9790 | + dput(parent); | |
9791 | + aufs_read_unlock(dentry, AuLock_IR); | |
4f0767ce | 9792 | +out: |
1facf9fc | 9793 | + if (unlikely(err < 0)) |
9794 | + err = 255; | |
9795 | + return err; | |
9796 | +} | |
9797 | + | |
9798 | +/* ---------------------------------------------------------------------- */ | |
9799 | + | |
4a4d8108 AM |
9800 | +static int aufs_commit_metadata(struct inode *inode) |
9801 | +{ | |
9802 | + int err; | |
9803 | + aufs_bindex_t bindex; | |
9804 | + struct super_block *sb; | |
9805 | + struct inode *h_inode; | |
9806 | + int (*f)(struct inode *inode); | |
9807 | + | |
9808 | + sb = inode->i_sb; | |
e49829fe | 9809 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 AM |
9810 | + ii_write_lock_child(inode); |
9811 | + bindex = au_ibstart(inode); | |
9812 | + AuDebugOn(bindex < 0); | |
9813 | + h_inode = au_h_iptr(inode, bindex); | |
9814 | + | |
9815 | + f = h_inode->i_sb->s_export_op->commit_metadata; | |
9816 | + if (f) | |
9817 | + err = f(h_inode); | |
9818 | + else { | |
9819 | + struct writeback_control wbc = { | |
9820 | + .sync_mode = WB_SYNC_ALL, | |
9821 | + .nr_to_write = 0 /* metadata only */ | |
9822 | + }; | |
9823 | + | |
9824 | + err = sync_inode(h_inode, &wbc); | |
9825 | + } | |
9826 | + | |
9827 | + au_cpup_attr_timesizes(inode); | |
9828 | + ii_write_unlock(inode); | |
9829 | + si_read_unlock(sb); | |
9830 | + return err; | |
9831 | +} | |
9832 | + | |
9833 | +/* ---------------------------------------------------------------------- */ | |
9834 | + | |
1facf9fc | 9835 | +static struct export_operations aufs_export_op = { |
4a4d8108 | 9836 | + .fh_to_dentry = aufs_fh_to_dentry, |
1facf9fc | 9837 | + /* .fh_to_parent = aufs_fh_to_parent, */ |
4a4d8108 AM |
9838 | + .encode_fh = aufs_encode_fh, |
9839 | + .commit_metadata = aufs_commit_metadata | |
1facf9fc | 9840 | +}; |
9841 | + | |
9842 | +void au_export_init(struct super_block *sb) | |
9843 | +{ | |
9844 | + struct au_sbinfo *sbinfo; | |
9845 | + __u32 u; | |
9846 | + | |
9847 | + sb->s_export_op = &aufs_export_op; | |
9848 | + sbinfo = au_sbi(sb); | |
9849 | + sbinfo->si_xigen = NULL; | |
9850 | + get_random_bytes(&u, sizeof(u)); | |
9851 | + BUILD_BUG_ON(sizeof(u) != sizeof(int)); | |
9852 | + atomic_set(&sbinfo->si_xigen_next, u); | |
9853 | +} | |
7f207e10 AM |
9854 | diff -urN /usr/share/empty/fs/aufs/file.c linux/fs/aufs/file.c |
9855 | --- /usr/share/empty/fs/aufs/file.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 9856 | +++ linux/fs/aufs/file.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 9857 | @@ -0,0 +1,676 @@ |
1facf9fc | 9858 | +/* |
027c5e7a | 9859 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 9860 | + * |
9861 | + * This program, aufs is free software; you can redistribute it and/or modify | |
9862 | + * it under the terms of the GNU General Public License as published by | |
9863 | + * the Free Software Foundation; either version 2 of the License, or | |
9864 | + * (at your option) any later version. | |
dece6358 AM |
9865 | + * |
9866 | + * This program is distributed in the hope that it will be useful, | |
9867 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
9868 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
9869 | + * GNU General Public License for more details. | |
9870 | + * | |
9871 | + * You should have received a copy of the GNU General Public License | |
9872 | + * along with this program; if not, write to the Free Software | |
9873 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 9874 | + */ |
9875 | + | |
9876 | +/* | |
4a4d8108 | 9877 | + * handling file/dir, and address_space operation |
1facf9fc | 9878 | + */ |
9879 | + | |
dece6358 | 9880 | +#include <linux/file.h> |
4a4d8108 AM |
9881 | +#include <linux/fsnotify.h> |
9882 | +#include <linux/namei.h> | |
9883 | +#include <linux/pagemap.h> | |
1facf9fc | 9884 | +#include "aufs.h" |
9885 | + | |
4a4d8108 AM |
9886 | +/* drop flags for writing */ |
9887 | +unsigned int au_file_roflags(unsigned int flags) | |
9888 | +{ | |
9889 | + flags &= ~(O_WRONLY | O_RDWR | O_APPEND | O_CREAT | O_TRUNC); | |
9890 | + flags |= O_RDONLY | O_NOATIME; | |
9891 | + return flags; | |
9892 | +} | |
9893 | + | |
9894 | +/* common functions to regular file and dir */ | |
9895 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
9896 | + struct file *file) | |
1facf9fc | 9897 | +{ |
1308ab2a | 9898 | + struct file *h_file; |
4a4d8108 AM |
9899 | + struct dentry *h_dentry; |
9900 | + struct inode *h_inode; | |
9901 | + struct super_block *sb; | |
9902 | + struct au_branch *br; | |
9903 | + struct path h_path; | |
9904 | + int err, exec_flag; | |
1facf9fc | 9905 | + |
4a4d8108 AM |
9906 | + /* a race condition can happen between open and unlink/rmdir */ |
9907 | + h_file = ERR_PTR(-ENOENT); | |
9908 | + h_dentry = au_h_dptr(dentry, bindex); | |
b752ccd1 | 9909 | + if (au_test_nfsd() && !h_dentry) |
4a4d8108 AM |
9910 | + goto out; |
9911 | + h_inode = h_dentry->d_inode; | |
b752ccd1 | 9912 | + if (au_test_nfsd() && !h_inode) |
4a4d8108 | 9913 | + goto out; |
027c5e7a AM |
9914 | + spin_lock(&h_dentry->d_lock); |
9915 | + err = (!d_unhashed(dentry) && d_unlinked(h_dentry)) | |
9916 | + || !h_inode | |
9917 | + /* || !dentry->d_inode->i_nlink */ | |
9918 | + ; | |
9919 | + spin_unlock(&h_dentry->d_lock); | |
9920 | + if (unlikely(err)) | |
4a4d8108 | 9921 | + goto out; |
1facf9fc | 9922 | + |
4a4d8108 AM |
9923 | + sb = dentry->d_sb; |
9924 | + br = au_sbr(sb, bindex); | |
9925 | + h_file = ERR_PTR(-EACCES); | |
2cbb1c4b | 9926 | + exec_flag = flags & __FMODE_EXEC; |
4a4d8108 | 9927 | + if (exec_flag && (br->br_mnt->mnt_flags & MNT_NOEXEC)) |
027c5e7a | 9928 | + goto out; |
1facf9fc | 9929 | + |
4a4d8108 AM |
9930 | + /* drop flags for writing */ |
9931 | + if (au_test_ro(sb, bindex, dentry->d_inode)) | |
9932 | + flags = au_file_roflags(flags); | |
9933 | + flags &= ~O_CREAT; | |
9934 | + atomic_inc(&br->br_count); | |
9935 | + h_path.dentry = h_dentry; | |
9936 | + h_path.mnt = br->br_mnt; | |
9937 | + if (!au_special_file(h_inode->i_mode)) | |
9938 | + h_file = vfsub_dentry_open(&h_path, flags); | |
9939 | + else { | |
9940 | + /* this block depends upon the configuration */ | |
9941 | + di_read_unlock(dentry, AuLock_IR); | |
9942 | + fi_write_unlock(file); | |
9943 | + si_read_unlock(sb); | |
9944 | + h_file = vfsub_dentry_open(&h_path, flags); | |
9945 | + si_noflush_read_lock(sb); | |
9946 | + fi_write_lock(file); | |
9947 | + di_read_lock_child(dentry, AuLock_IR); | |
dece6358 | 9948 | + } |
4a4d8108 AM |
9949 | + if (IS_ERR(h_file)) |
9950 | + goto out_br; | |
dece6358 | 9951 | + |
4a4d8108 AM |
9952 | + if (exec_flag) { |
9953 | + err = deny_write_access(h_file); | |
9954 | + if (unlikely(err)) { | |
9955 | + fput(h_file); | |
9956 | + h_file = ERR_PTR(err); | |
9957 | + goto out_br; | |
9958 | + } | |
9959 | + } | |
953406b4 | 9960 | + fsnotify_open(h_file); |
4a4d8108 | 9961 | + goto out; /* success */ |
1facf9fc | 9962 | + |
4f0767ce | 9963 | +out_br: |
4a4d8108 | 9964 | + atomic_dec(&br->br_count); |
4f0767ce | 9965 | +out: |
4a4d8108 AM |
9966 | + return h_file; |
9967 | +} | |
1308ab2a | 9968 | + |
4a4d8108 AM |
9969 | +int au_do_open(struct file *file, int (*open)(struct file *file, int flags), |
9970 | + struct au_fidir *fidir) | |
1facf9fc | 9971 | +{ |
dece6358 | 9972 | + int err; |
1facf9fc | 9973 | + struct dentry *dentry; |
1308ab2a | 9974 | + |
4a4d8108 AM |
9975 | + err = au_finfo_init(file, fidir); |
9976 | + if (unlikely(err)) | |
9977 | + goto out; | |
1facf9fc | 9978 | + |
9979 | + dentry = file->f_dentry; | |
4a4d8108 AM |
9980 | + di_read_lock_child(dentry, AuLock_IR); |
9981 | + err = open(file, vfsub_file_flags(file)); | |
9982 | + di_read_unlock(dentry, AuLock_IR); | |
1facf9fc | 9983 | + |
4a4d8108 AM |
9984 | + fi_write_unlock(file); |
9985 | + if (unlikely(err)) { | |
9986 | + au_fi(file)->fi_hdir = NULL; | |
9987 | + au_finfo_fin(file); | |
1308ab2a | 9988 | + } |
4a4d8108 | 9989 | + |
4f0767ce | 9990 | +out: |
1308ab2a | 9991 | + return err; |
9992 | +} | |
dece6358 | 9993 | + |
4a4d8108 | 9994 | +int au_reopen_nondir(struct file *file) |
1308ab2a | 9995 | +{ |
4a4d8108 AM |
9996 | + int err; |
9997 | + aufs_bindex_t bstart; | |
9998 | + struct dentry *dentry; | |
9999 | + struct file *h_file, *h_file_tmp; | |
1308ab2a | 10000 | + |
4a4d8108 AM |
10001 | + dentry = file->f_dentry; |
10002 | + AuDebugOn(au_special_file(dentry->d_inode->i_mode)); | |
10003 | + bstart = au_dbstart(dentry); | |
10004 | + h_file_tmp = NULL; | |
10005 | + if (au_fbstart(file) == bstart) { | |
10006 | + h_file = au_hf_top(file); | |
10007 | + if (file->f_mode == h_file->f_mode) | |
10008 | + return 0; /* success */ | |
10009 | + h_file_tmp = h_file; | |
10010 | + get_file(h_file_tmp); | |
10011 | + au_set_h_fptr(file, bstart, NULL); | |
10012 | + } | |
10013 | + AuDebugOn(au_fi(file)->fi_hdir); | |
10014 | + AuDebugOn(au_fbstart(file) < bstart); | |
1308ab2a | 10015 | + |
4a4d8108 AM |
10016 | + h_file = au_h_open(dentry, bstart, vfsub_file_flags(file) & ~O_TRUNC, |
10017 | + file); | |
10018 | + err = PTR_ERR(h_file); | |
10019 | + if (IS_ERR(h_file)) | |
10020 | + goto out; /* todo: close all? */ | |
10021 | + | |
10022 | + err = 0; | |
10023 | + au_set_fbstart(file, bstart); | |
10024 | + au_set_h_fptr(file, bstart, h_file); | |
10025 | + au_update_figen(file); | |
10026 | + /* todo: necessary? */ | |
10027 | + /* file->f_ra = h_file->f_ra; */ | |
10028 | + | |
4f0767ce | 10029 | +out: |
4a4d8108 AM |
10030 | + if (h_file_tmp) |
10031 | + fput(h_file_tmp); | |
10032 | + return err; | |
1facf9fc | 10033 | +} |
10034 | + | |
1308ab2a | 10035 | +/* ---------------------------------------------------------------------- */ |
10036 | + | |
4a4d8108 AM |
10037 | +static int au_reopen_wh(struct file *file, aufs_bindex_t btgt, |
10038 | + struct dentry *hi_wh) | |
1facf9fc | 10039 | +{ |
4a4d8108 AM |
10040 | + int err; |
10041 | + aufs_bindex_t bstart; | |
10042 | + struct au_dinfo *dinfo; | |
10043 | + struct dentry *h_dentry; | |
10044 | + struct au_hdentry *hdp; | |
1facf9fc | 10045 | + |
4a4d8108 AM |
10046 | + dinfo = au_di(file->f_dentry); |
10047 | + AuRwMustWriteLock(&dinfo->di_rwsem); | |
dece6358 | 10048 | + |
4a4d8108 AM |
10049 | + bstart = dinfo->di_bstart; |
10050 | + dinfo->di_bstart = btgt; | |
10051 | + hdp = dinfo->di_hdentry; | |
10052 | + h_dentry = hdp[0 + btgt].hd_dentry; | |
10053 | + hdp[0 + btgt].hd_dentry = hi_wh; | |
10054 | + err = au_reopen_nondir(file); | |
10055 | + hdp[0 + btgt].hd_dentry = h_dentry; | |
10056 | + dinfo->di_bstart = bstart; | |
1facf9fc | 10057 | + |
1facf9fc | 10058 | + return err; |
10059 | +} | |
10060 | + | |
4a4d8108 AM |
10061 | +static int au_ready_to_write_wh(struct file *file, loff_t len, |
10062 | + aufs_bindex_t bcpup) | |
1facf9fc | 10063 | +{ |
4a4d8108 | 10064 | + int err; |
027c5e7a AM |
10065 | + struct inode *inode, *h_inode; |
10066 | + struct dentry *dentry, *h_dentry, *hi_wh; | |
1facf9fc | 10067 | + |
dece6358 | 10068 | + dentry = file->f_dentry; |
4a4d8108 | 10069 | + au_update_dbstart(dentry); |
dece6358 | 10070 | + inode = dentry->d_inode; |
027c5e7a AM |
10071 | + h_inode = NULL; |
10072 | + if (au_dbstart(dentry) <= bcpup && au_dbend(dentry) >= bcpup) { | |
10073 | + h_dentry = au_h_dptr(dentry, bcpup); | |
10074 | + if (h_dentry) | |
10075 | + h_inode = h_dentry->d_inode; | |
10076 | + } | |
4a4d8108 | 10077 | + hi_wh = au_hi_wh(inode, bcpup); |
027c5e7a | 10078 | + if (!hi_wh && !h_inode) |
4a4d8108 AM |
10079 | + err = au_sio_cpup_wh(dentry, bcpup, len, file); |
10080 | + else | |
10081 | + /* already copied-up after unlink */ | |
10082 | + err = au_reopen_wh(file, bcpup, hi_wh); | |
1facf9fc | 10083 | + |
4a4d8108 AM |
10084 | + if (!err |
10085 | + && inode->i_nlink > 1 | |
10086 | + && au_opt_test(au_mntflags(dentry->d_sb), PLINK)) | |
10087 | + au_plink_append(inode, bcpup, au_h_dptr(dentry, bcpup)); | |
1308ab2a | 10088 | + |
dece6358 | 10089 | + return err; |
1facf9fc | 10090 | +} |
10091 | + | |
4a4d8108 AM |
10092 | +/* |
10093 | + * prepare the @file for writing. | |
10094 | + */ | |
10095 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin) | |
1facf9fc | 10096 | +{ |
4a4d8108 | 10097 | + int err; |
027c5e7a | 10098 | + aufs_bindex_t bstart, bcpup, dbstart; |
4a4d8108 AM |
10099 | + struct dentry *dentry, *parent, *h_dentry; |
10100 | + struct inode *h_inode, *inode; | |
1facf9fc | 10101 | + struct super_block *sb; |
4a4d8108 | 10102 | + struct file *h_file; |
1facf9fc | 10103 | + |
10104 | + dentry = file->f_dentry; | |
1facf9fc | 10105 | + sb = dentry->d_sb; |
4a4d8108 AM |
10106 | + inode = dentry->d_inode; |
10107 | + AuDebugOn(au_special_file(inode->i_mode)); | |
10108 | + bstart = au_fbstart(file); | |
10109 | + err = au_test_ro(sb, bstart, inode); | |
10110 | + if (!err && (au_hf_top(file)->f_mode & FMODE_WRITE)) { | |
10111 | + err = au_pin(pin, dentry, bstart, AuOpt_UDBA_NONE, /*flags*/0); | |
1facf9fc | 10112 | + goto out; |
4a4d8108 | 10113 | + } |
1facf9fc | 10114 | + |
027c5e7a | 10115 | + /* need to cpup or reopen */ |
4a4d8108 AM |
10116 | + parent = dget_parent(dentry); |
10117 | + di_write_lock_parent(parent); | |
10118 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
10119 | + bcpup = err; | |
10120 | + if (unlikely(err < 0)) | |
10121 | + goto out_dgrade; | |
10122 | + err = 0; | |
10123 | + | |
027c5e7a | 10124 | + if (!d_unhashed(dentry) && !au_h_dptr(parent, bcpup)) { |
4a4d8108 | 10125 | + err = au_cpup_dirs(dentry, bcpup); |
1facf9fc | 10126 | + if (unlikely(err)) |
4a4d8108 AM |
10127 | + goto out_dgrade; |
10128 | + } | |
10129 | + | |
10130 | + err = au_pin(pin, dentry, bcpup, AuOpt_UDBA_NONE, | |
10131 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
10132 | + if (unlikely(err)) | |
10133 | + goto out_dgrade; | |
10134 | + | |
10135 | + h_dentry = au_hf_top(file)->f_dentry; | |
10136 | + h_inode = h_dentry->d_inode; | |
027c5e7a AM |
10137 | + dbstart = au_dbstart(dentry); |
10138 | + if (dbstart <= bcpup) { | |
10139 | + h_dentry = au_h_dptr(dentry, bcpup); | |
10140 | + AuDebugOn(!h_dentry); | |
10141 | + h_inode = h_dentry->d_inode; | |
10142 | + AuDebugOn(!h_inode); | |
10143 | + bstart = bcpup; | |
10144 | + } | |
10145 | + | |
10146 | + if (dbstart <= bcpup /* just reopen */ | |
10147 | + || !d_unhashed(dentry) /* copyup and reopen */ | |
10148 | + ) { | |
10149 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
10150 | + h_file = au_h_open_pre(dentry, bstart); | |
10151 | + if (IS_ERR(h_file)) { | |
10152 | + err = PTR_ERR(h_file); | |
10153 | + h_file = NULL; | |
10154 | + } else { | |
10155 | + di_downgrade_lock(parent, AuLock_IR); | |
10156 | + if (dbstart > bcpup) | |
10157 | + err = au_sio_cpup_simple(dentry, bcpup, len, | |
10158 | + AuCpup_DTIME); | |
10159 | + if (!err) | |
10160 | + err = au_reopen_nondir(file); | |
10161 | + } | |
10162 | + mutex_unlock(&h_inode->i_mutex); | |
10163 | + au_h_open_post(dentry, bstart, h_file); | |
10164 | + } else { /* copyup as wh and reopen */ | |
10165 | + /* | |
10166 | + * since writable hfsplus branch is not supported, | |
10167 | + * h_open_pre/post() are unnecessary. | |
10168 | + */ | |
10169 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
4a4d8108 AM |
10170 | + err = au_ready_to_write_wh(file, len, bcpup); |
10171 | + di_downgrade_lock(parent, AuLock_IR); | |
027c5e7a | 10172 | + mutex_unlock(&h_inode->i_mutex); |
4a4d8108 | 10173 | + } |
4a4d8108 AM |
10174 | + |
10175 | + if (!err) { | |
10176 | + au_pin_set_parent_lflag(pin, /*lflag*/0); | |
10177 | + goto out_dput; /* success */ | |
10178 | + } | |
10179 | + au_unpin(pin); | |
10180 | + goto out_unlock; | |
1facf9fc | 10181 | + |
4f0767ce | 10182 | +out_dgrade: |
4a4d8108 | 10183 | + di_downgrade_lock(parent, AuLock_IR); |
4f0767ce | 10184 | +out_unlock: |
4a4d8108 | 10185 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 10186 | +out_dput: |
4a4d8108 | 10187 | + dput(parent); |
4f0767ce | 10188 | +out: |
1facf9fc | 10189 | + return err; |
10190 | +} | |
10191 | + | |
4a4d8108 AM |
10192 | +/* ---------------------------------------------------------------------- */ |
10193 | + | |
10194 | +int au_do_flush(struct file *file, fl_owner_t id, | |
10195 | + int (*flush)(struct file *file, fl_owner_t id)) | |
1facf9fc | 10196 | +{ |
4a4d8108 | 10197 | + int err; |
1308ab2a | 10198 | + struct dentry *dentry; |
1facf9fc | 10199 | + struct super_block *sb; |
4a4d8108 | 10200 | + struct inode *inode; |
1facf9fc | 10201 | + |
1facf9fc | 10202 | + dentry = file->f_dentry; |
10203 | + sb = dentry->d_sb; | |
dece6358 | 10204 | + inode = dentry->d_inode; |
4a4d8108 AM |
10205 | + si_noflush_read_lock(sb); |
10206 | + fi_read_lock(file); | |
b752ccd1 | 10207 | + ii_read_lock_child(inode); |
1facf9fc | 10208 | + |
4a4d8108 AM |
10209 | + err = flush(file, id); |
10210 | + au_cpup_attr_timesizes(inode); | |
1facf9fc | 10211 | + |
b752ccd1 | 10212 | + ii_read_unlock(inode); |
4a4d8108 | 10213 | + fi_read_unlock(file); |
1308ab2a | 10214 | + si_read_unlock(sb); |
dece6358 | 10215 | + return err; |
1facf9fc | 10216 | +} |
10217 | + | |
4a4d8108 AM |
10218 | +/* ---------------------------------------------------------------------- */ |
10219 | + | |
10220 | +static int au_file_refresh_by_inode(struct file *file, int *need_reopen) | |
1facf9fc | 10221 | +{ |
4a4d8108 AM |
10222 | + int err; |
10223 | + aufs_bindex_t bstart; | |
10224 | + struct au_pin pin; | |
10225 | + struct au_finfo *finfo; | |
10226 | + struct dentry *dentry, *parent, *hi_wh; | |
10227 | + struct inode *inode; | |
1facf9fc | 10228 | + struct super_block *sb; |
10229 | + | |
4a4d8108 AM |
10230 | + FiMustWriteLock(file); |
10231 | + | |
10232 | + err = 0; | |
10233 | + finfo = au_fi(file); | |
1308ab2a | 10234 | + dentry = file->f_dentry; |
10235 | + sb = dentry->d_sb; | |
4a4d8108 AM |
10236 | + inode = dentry->d_inode; |
10237 | + bstart = au_ibstart(inode); | |
027c5e7a | 10238 | + if (bstart == finfo->fi_btop || IS_ROOT(dentry)) |
1308ab2a | 10239 | + goto out; |
dece6358 | 10240 | + |
4a4d8108 AM |
10241 | + parent = dget_parent(dentry); |
10242 | + if (au_test_ro(sb, bstart, inode)) { | |
10243 | + di_read_lock_parent(parent, !AuLock_IR); | |
10244 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
10245 | + bstart = err; | |
10246 | + di_read_unlock(parent, !AuLock_IR); | |
10247 | + if (unlikely(err < 0)) | |
10248 | + goto out_parent; | |
10249 | + err = 0; | |
1facf9fc | 10250 | + } |
1facf9fc | 10251 | + |
4a4d8108 AM |
10252 | + di_read_lock_parent(parent, AuLock_IR); |
10253 | + hi_wh = au_hi_wh(inode, bstart); | |
7f207e10 AM |
10254 | + if (!S_ISDIR(inode->i_mode) |
10255 | + && au_opt_test(au_mntflags(sb), PLINK) | |
4a4d8108 AM |
10256 | + && au_plink_test(inode) |
10257 | + && !d_unhashed(dentry)) { | |
10258 | + err = au_test_and_cpup_dirs(dentry, bstart); | |
10259 | + if (unlikely(err)) | |
10260 | + goto out_unlock; | |
10261 | + | |
10262 | + /* always superio. */ | |
10263 | + err = au_pin(&pin, dentry, bstart, AuOpt_UDBA_NONE, | |
10264 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
10265 | + if (!err) | |
10266 | + err = au_sio_cpup_simple(dentry, bstart, -1, | |
10267 | + AuCpup_DTIME); | |
10268 | + au_unpin(&pin); | |
10269 | + } else if (hi_wh) { | |
10270 | + /* already copied-up after unlink */ | |
10271 | + err = au_reopen_wh(file, bstart, hi_wh); | |
10272 | + *need_reopen = 0; | |
10273 | + } | |
1facf9fc | 10274 | + |
4f0767ce | 10275 | +out_unlock: |
4a4d8108 | 10276 | + di_read_unlock(parent, AuLock_IR); |
4f0767ce | 10277 | +out_parent: |
4a4d8108 | 10278 | + dput(parent); |
4f0767ce | 10279 | +out: |
1308ab2a | 10280 | + return err; |
dece6358 | 10281 | +} |
1facf9fc | 10282 | + |
4a4d8108 | 10283 | +static void au_do_refresh_dir(struct file *file) |
dece6358 | 10284 | +{ |
4a4d8108 AM |
10285 | + aufs_bindex_t bindex, bend, new_bindex, brid; |
10286 | + struct au_hfile *p, tmp, *q; | |
10287 | + struct au_finfo *finfo; | |
1308ab2a | 10288 | + struct super_block *sb; |
4a4d8108 | 10289 | + struct au_fidir *fidir; |
1facf9fc | 10290 | + |
4a4d8108 | 10291 | + FiMustWriteLock(file); |
1facf9fc | 10292 | + |
4a4d8108 AM |
10293 | + sb = file->f_dentry->d_sb; |
10294 | + finfo = au_fi(file); | |
10295 | + fidir = finfo->fi_hdir; | |
10296 | + AuDebugOn(!fidir); | |
10297 | + p = fidir->fd_hfile + finfo->fi_btop; | |
10298 | + brid = p->hf_br->br_id; | |
10299 | + bend = fidir->fd_bbot; | |
10300 | + for (bindex = finfo->fi_btop; bindex <= bend; bindex++, p++) { | |
10301 | + if (!p->hf_file) | |
10302 | + continue; | |
1308ab2a | 10303 | + |
4a4d8108 AM |
10304 | + new_bindex = au_br_index(sb, p->hf_br->br_id); |
10305 | + if (new_bindex == bindex) | |
10306 | + continue; | |
10307 | + if (new_bindex < 0) { | |
10308 | + au_set_h_fptr(file, bindex, NULL); | |
10309 | + continue; | |
10310 | + } | |
1308ab2a | 10311 | + |
4a4d8108 AM |
10312 | + /* swap two lower inode, and loop again */ |
10313 | + q = fidir->fd_hfile + new_bindex; | |
10314 | + tmp = *q; | |
10315 | + *q = *p; | |
10316 | + *p = tmp; | |
10317 | + if (tmp.hf_file) { | |
10318 | + bindex--; | |
10319 | + p--; | |
10320 | + } | |
10321 | + } | |
1308ab2a | 10322 | + |
4a4d8108 | 10323 | + p = fidir->fd_hfile; |
027c5e7a | 10324 | + if (!au_test_mmapped(file) && !d_unlinked(file->f_dentry)) { |
4a4d8108 AM |
10325 | + bend = au_sbend(sb); |
10326 | + for (finfo->fi_btop = 0; finfo->fi_btop <= bend; | |
10327 | + finfo->fi_btop++, p++) | |
10328 | + if (p->hf_file) { | |
10329 | + if (p->hf_file->f_dentry | |
10330 | + && p->hf_file->f_dentry->d_inode) | |
10331 | + break; | |
10332 | + else | |
10333 | + au_hfput(p, file); | |
10334 | + } | |
10335 | + } else { | |
10336 | + bend = au_br_index(sb, brid); | |
10337 | + for (finfo->fi_btop = 0; finfo->fi_btop < bend; | |
10338 | + finfo->fi_btop++, p++) | |
10339 | + if (p->hf_file) | |
10340 | + au_hfput(p, file); | |
10341 | + bend = au_sbend(sb); | |
10342 | + } | |
1308ab2a | 10343 | + |
4a4d8108 AM |
10344 | + p = fidir->fd_hfile + bend; |
10345 | + for (fidir->fd_bbot = bend; fidir->fd_bbot >= finfo->fi_btop; | |
10346 | + fidir->fd_bbot--, p--) | |
10347 | + if (p->hf_file) { | |
10348 | + if (p->hf_file->f_dentry | |
10349 | + && p->hf_file->f_dentry->d_inode) | |
10350 | + break; | |
10351 | + else | |
10352 | + au_hfput(p, file); | |
10353 | + } | |
10354 | + AuDebugOn(fidir->fd_bbot < finfo->fi_btop); | |
1308ab2a | 10355 | +} |
10356 | + | |
4a4d8108 AM |
10357 | +/* |
10358 | + * after branch manipulating, refresh the file. | |
10359 | + */ | |
10360 | +static int refresh_file(struct file *file, int (*reopen)(struct file *file)) | |
1facf9fc | 10361 | +{ |
4a4d8108 AM |
10362 | + int err, need_reopen; |
10363 | + aufs_bindex_t bend, bindex; | |
10364 | + struct dentry *dentry; | |
1308ab2a | 10365 | + struct au_finfo *finfo; |
4a4d8108 | 10366 | + struct au_hfile *hfile; |
1facf9fc | 10367 | + |
4a4d8108 | 10368 | + dentry = file->f_dentry; |
1308ab2a | 10369 | + finfo = au_fi(file); |
4a4d8108 AM |
10370 | + if (!finfo->fi_hdir) { |
10371 | + hfile = &finfo->fi_htop; | |
10372 | + AuDebugOn(!hfile->hf_file); | |
10373 | + bindex = au_br_index(dentry->d_sb, hfile->hf_br->br_id); | |
10374 | + AuDebugOn(bindex < 0); | |
10375 | + if (bindex != finfo->fi_btop) | |
10376 | + au_set_fbstart(file, bindex); | |
10377 | + } else { | |
10378 | + err = au_fidir_realloc(finfo, au_sbend(dentry->d_sb) + 1); | |
10379 | + if (unlikely(err)) | |
10380 | + goto out; | |
10381 | + au_do_refresh_dir(file); | |
10382 | + } | |
1facf9fc | 10383 | + |
4a4d8108 AM |
10384 | + err = 0; |
10385 | + need_reopen = 1; | |
10386 | + if (!au_test_mmapped(file)) | |
10387 | + err = au_file_refresh_by_inode(file, &need_reopen); | |
027c5e7a | 10388 | + if (!err && need_reopen && !d_unlinked(dentry)) |
4a4d8108 AM |
10389 | + err = reopen(file); |
10390 | + if (!err) { | |
10391 | + au_update_figen(file); | |
10392 | + goto out; /* success */ | |
10393 | + } | |
10394 | + | |
10395 | + /* error, close all lower files */ | |
10396 | + if (finfo->fi_hdir) { | |
10397 | + bend = au_fbend_dir(file); | |
10398 | + for (bindex = au_fbstart(file); bindex <= bend; bindex++) | |
10399 | + au_set_h_fptr(file, bindex, NULL); | |
10400 | + } | |
1facf9fc | 10401 | + |
4f0767ce | 10402 | +out: |
1facf9fc | 10403 | + return err; |
10404 | +} | |
10405 | + | |
4a4d8108 AM |
10406 | +/* common function to regular file and dir */ |
10407 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
10408 | + int wlock) | |
dece6358 | 10409 | +{ |
1308ab2a | 10410 | + int err; |
4a4d8108 AM |
10411 | + unsigned int sigen, figen; |
10412 | + aufs_bindex_t bstart; | |
10413 | + unsigned char pseudo_link; | |
10414 | + struct dentry *dentry; | |
10415 | + struct inode *inode; | |
1facf9fc | 10416 | + |
4a4d8108 AM |
10417 | + err = 0; |
10418 | + dentry = file->f_dentry; | |
10419 | + inode = dentry->d_inode; | |
10420 | + AuDebugOn(au_special_file(inode->i_mode)); | |
10421 | + sigen = au_sigen(dentry->d_sb); | |
10422 | + fi_write_lock(file); | |
10423 | + figen = au_figen(file); | |
10424 | + di_write_lock_child(dentry); | |
10425 | + bstart = au_dbstart(dentry); | |
10426 | + pseudo_link = (bstart != au_ibstart(inode)); | |
10427 | + if (sigen == figen && !pseudo_link && au_fbstart(file) == bstart) { | |
10428 | + if (!wlock) { | |
10429 | + di_downgrade_lock(dentry, AuLock_IR); | |
10430 | + fi_downgrade_lock(file); | |
10431 | + } | |
10432 | + goto out; /* success */ | |
10433 | + } | |
dece6358 | 10434 | + |
4a4d8108 | 10435 | + AuDbg("sigen %d, figen %d\n", sigen, figen); |
027c5e7a | 10436 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 | 10437 | + err = au_reval_dpath(dentry, sigen); |
027c5e7a | 10438 | + AuDebugOn(!err && au_digen_test(dentry, sigen)); |
4a4d8108 | 10439 | + } |
dece6358 | 10440 | + |
027c5e7a AM |
10441 | + if (!err) |
10442 | + err = refresh_file(file, reopen); | |
4a4d8108 AM |
10443 | + if (!err) { |
10444 | + if (!wlock) { | |
10445 | + di_downgrade_lock(dentry, AuLock_IR); | |
10446 | + fi_downgrade_lock(file); | |
10447 | + } | |
10448 | + } else { | |
10449 | + di_write_unlock(dentry); | |
10450 | + fi_write_unlock(file); | |
10451 | + } | |
1facf9fc | 10452 | + |
4f0767ce | 10453 | +out: |
1308ab2a | 10454 | + return err; |
10455 | +} | |
1facf9fc | 10456 | + |
4a4d8108 AM |
10457 | +/* ---------------------------------------------------------------------- */ |
10458 | + | |
10459 | +/* cf. aufs_nopage() */ | |
10460 | +/* for madvise(2) */ | |
10461 | +static int aufs_readpage(struct file *file __maybe_unused, struct page *page) | |
1308ab2a | 10462 | +{ |
4a4d8108 AM |
10463 | + unlock_page(page); |
10464 | + return 0; | |
10465 | +} | |
1facf9fc | 10466 | + |
4a4d8108 AM |
10467 | +/* it will never be called, but necessary to support O_DIRECT */ |
10468 | +static ssize_t aufs_direct_IO(int rw, struct kiocb *iocb, | |
10469 | + const struct iovec *iov, loff_t offset, | |
10470 | + unsigned long nr_segs) | |
10471 | +{ BUG(); return 0; } | |
1facf9fc | 10472 | + |
4a4d8108 AM |
10473 | +/* |
10474 | + * it will never be called, but madvise and fadvise behaves differently | |
10475 | + * when get_xip_mem is defined | |
10476 | + */ | |
10477 | +static int aufs_get_xip_mem(struct address_space *mapping, pgoff_t pgoff, | |
10478 | + int create, void **kmem, unsigned long *pfn) | |
10479 | +{ BUG(); return 0; } | |
1facf9fc | 10480 | + |
4a4d8108 AM |
10481 | +/* they will never be called. */ |
10482 | +#ifdef CONFIG_AUFS_DEBUG | |
10483 | +static int aufs_write_begin(struct file *file, struct address_space *mapping, | |
10484 | + loff_t pos, unsigned len, unsigned flags, | |
10485 | + struct page **pagep, void **fsdata) | |
10486 | +{ AuUnsupport(); return 0; } | |
10487 | +static int aufs_write_end(struct file *file, struct address_space *mapping, | |
10488 | + loff_t pos, unsigned len, unsigned copied, | |
10489 | + struct page *page, void *fsdata) | |
10490 | +{ AuUnsupport(); return 0; } | |
10491 | +static int aufs_writepage(struct page *page, struct writeback_control *wbc) | |
10492 | +{ AuUnsupport(); return 0; } | |
1308ab2a | 10493 | + |
4a4d8108 AM |
10494 | +static int aufs_set_page_dirty(struct page *page) |
10495 | +{ AuUnsupport(); return 0; } | |
10496 | +static void aufs_invalidatepage(struct page *page, unsigned long offset) | |
10497 | +{ AuUnsupport(); } | |
10498 | +static int aufs_releasepage(struct page *page, gfp_t gfp) | |
10499 | +{ AuUnsupport(); return 0; } | |
10500 | +static int aufs_migratepage(struct address_space *mapping, struct page *newpage, | |
10501 | + struct page *page) | |
10502 | +{ AuUnsupport(); return 0; } | |
10503 | +static int aufs_launder_page(struct page *page) | |
10504 | +{ AuUnsupport(); return 0; } | |
10505 | +static int aufs_is_partially_uptodate(struct page *page, | |
10506 | + read_descriptor_t *desc, | |
10507 | + unsigned long from) | |
10508 | +{ AuUnsupport(); return 0; } | |
10509 | +static int aufs_error_remove_page(struct address_space *mapping, | |
10510 | + struct page *page) | |
10511 | +{ AuUnsupport(); return 0; } | |
10512 | +#endif /* CONFIG_AUFS_DEBUG */ | |
10513 | + | |
10514 | +const struct address_space_operations aufs_aop = { | |
10515 | + .readpage = aufs_readpage, | |
10516 | + .direct_IO = aufs_direct_IO, | |
10517 | + .get_xip_mem = aufs_get_xip_mem, | |
10518 | +#ifdef CONFIG_AUFS_DEBUG | |
10519 | + .writepage = aufs_writepage, | |
4a4d8108 AM |
10520 | + /* no writepages, because of writepage */ |
10521 | + .set_page_dirty = aufs_set_page_dirty, | |
10522 | + /* no readpages, because of readpage */ | |
10523 | + .write_begin = aufs_write_begin, | |
10524 | + .write_end = aufs_write_end, | |
10525 | + /* no bmap, no block device */ | |
10526 | + .invalidatepage = aufs_invalidatepage, | |
10527 | + .releasepage = aufs_releasepage, | |
10528 | + .migratepage = aufs_migratepage, | |
10529 | + .launder_page = aufs_launder_page, | |
10530 | + .is_partially_uptodate = aufs_is_partially_uptodate, | |
10531 | + .error_remove_page = aufs_error_remove_page | |
10532 | +#endif /* CONFIG_AUFS_DEBUG */ | |
dece6358 | 10533 | +}; |
7f207e10 AM |
10534 | diff -urN /usr/share/empty/fs/aufs/file.h linux/fs/aufs/file.h |
10535 | --- /usr/share/empty/fs/aufs/file.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
10536 | +++ linux/fs/aufs/file.h 2011-08-24 13:30:24.731313534 +0200 |
10537 | @@ -0,0 +1,299 @@ | |
4a4d8108 | 10538 | +/* |
027c5e7a | 10539 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
10540 | + * |
10541 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10542 | + * it under the terms of the GNU General Public License as published by | |
10543 | + * the Free Software Foundation; either version 2 of the License, or | |
10544 | + * (at your option) any later version. | |
10545 | + * | |
10546 | + * This program is distributed in the hope that it will be useful, | |
10547 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10548 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10549 | + * GNU General Public License for more details. | |
10550 | + * | |
10551 | + * You should have received a copy of the GNU General Public License | |
10552 | + * along with this program; if not, write to the Free Software | |
10553 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
10554 | + */ | |
1facf9fc | 10555 | + |
4a4d8108 AM |
10556 | +/* |
10557 | + * file operations | |
10558 | + */ | |
1facf9fc | 10559 | + |
4a4d8108 AM |
10560 | +#ifndef __AUFS_FILE_H__ |
10561 | +#define __AUFS_FILE_H__ | |
1facf9fc | 10562 | + |
4a4d8108 | 10563 | +#ifdef __KERNEL__ |
1facf9fc | 10564 | + |
2cbb1c4b | 10565 | +#include <linux/file.h> |
4a4d8108 AM |
10566 | +#include <linux/fs.h> |
10567 | +#include <linux/poll.h> | |
10568 | +#include <linux/aufs_type.h> | |
10569 | +#include "rwsem.h" | |
1facf9fc | 10570 | + |
4a4d8108 AM |
10571 | +struct au_branch; |
10572 | +struct au_hfile { | |
10573 | + struct file *hf_file; | |
10574 | + struct au_branch *hf_br; | |
10575 | +}; | |
1facf9fc | 10576 | + |
4a4d8108 AM |
10577 | +struct au_vdir; |
10578 | +struct au_fidir { | |
10579 | + aufs_bindex_t fd_bbot; | |
10580 | + aufs_bindex_t fd_nent; | |
10581 | + struct au_vdir *fd_vdir_cache; | |
10582 | + struct au_hfile fd_hfile[]; | |
10583 | +}; | |
1facf9fc | 10584 | + |
4a4d8108 | 10585 | +static inline int au_fidir_sz(int nent) |
dece6358 | 10586 | +{ |
4f0767ce JR |
10587 | + AuDebugOn(nent < 0); |
10588 | + return sizeof(struct au_fidir) + sizeof(struct au_hfile) * nent; | |
4a4d8108 | 10589 | +} |
1facf9fc | 10590 | + |
4a4d8108 AM |
10591 | +struct au_finfo { |
10592 | + atomic_t fi_generation; | |
dece6358 | 10593 | + |
4a4d8108 AM |
10594 | + struct au_rwsem fi_rwsem; |
10595 | + aufs_bindex_t fi_btop; | |
10596 | + | |
10597 | + /* do not union them */ | |
10598 | + struct { /* for non-dir */ | |
10599 | + struct au_hfile fi_htop; | |
2cbb1c4b | 10600 | + atomic_t fi_mmapped; |
4a4d8108 AM |
10601 | + }; |
10602 | + struct au_fidir *fi_hdir; /* for dir only */ | |
10603 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 10604 | + |
4a4d8108 | 10605 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 10606 | + |
4a4d8108 AM |
10607 | +/* file.c */ |
10608 | +extern const struct address_space_operations aufs_aop; | |
10609 | +unsigned int au_file_roflags(unsigned int flags); | |
10610 | +struct file *au_h_open(struct dentry *dentry, aufs_bindex_t bindex, int flags, | |
10611 | + struct file *file); | |
10612 | +int au_do_open(struct file *file, int (*open)(struct file *file, int flags), | |
10613 | + struct au_fidir *fidir); | |
10614 | +int au_reopen_nondir(struct file *file); | |
10615 | +struct au_pin; | |
10616 | +int au_ready_to_write(struct file *file, loff_t len, struct au_pin *pin); | |
10617 | +int au_reval_and_lock_fdi(struct file *file, int (*reopen)(struct file *file), | |
10618 | + int wlock); | |
10619 | +int au_do_flush(struct file *file, fl_owner_t id, | |
10620 | + int (*flush)(struct file *file, fl_owner_t id)); | |
1facf9fc | 10621 | + |
4a4d8108 AM |
10622 | +/* poll.c */ |
10623 | +#ifdef CONFIG_AUFS_POLL | |
10624 | +unsigned int aufs_poll(struct file *file, poll_table *wait); | |
10625 | +#endif | |
1facf9fc | 10626 | + |
4a4d8108 AM |
10627 | +#ifdef CONFIG_AUFS_BR_HFSPLUS |
10628 | +/* hfsplus.c */ | |
10629 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex); | |
10630 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, | |
10631 | + struct file *h_file); | |
10632 | +#else | |
10633 | +static inline | |
10634 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex) | |
dece6358 | 10635 | +{ |
4a4d8108 AM |
10636 | + return NULL; |
10637 | +} | |
1facf9fc | 10638 | + |
4a4d8108 AM |
10639 | +AuStubVoid(au_h_open_post, struct dentry *dentry, aufs_bindex_t bindex, |
10640 | + struct file *h_file); | |
10641 | +#endif | |
1facf9fc | 10642 | + |
4a4d8108 AM |
10643 | +/* f_op.c */ |
10644 | +extern const struct file_operations aufs_file_fop; | |
4a4d8108 AM |
10645 | +int au_do_open_nondir(struct file *file, int flags); |
10646 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file); | |
10647 | + | |
10648 | +#ifdef CONFIG_AUFS_SP_IATTR | |
10649 | +/* f_op_sp.c */ | |
10650 | +int au_special_file(umode_t mode); | |
10651 | +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev); | |
10652 | +#else | |
10653 | +AuStubInt0(au_special_file, umode_t mode) | |
10654 | +static inline void au_init_special_fop(struct inode *inode, umode_t mode, | |
10655 | + dev_t rdev) | |
10656 | +{ | |
10657 | + init_special_inode(inode, mode, rdev); | |
10658 | +} | |
10659 | +#endif | |
1facf9fc | 10660 | + |
4a4d8108 AM |
10661 | +/* finfo.c */ |
10662 | +void au_hfput(struct au_hfile *hf, struct file *file); | |
10663 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, | |
10664 | + struct file *h_file); | |
1facf9fc | 10665 | + |
4a4d8108 | 10666 | +void au_update_figen(struct file *file); |
4a4d8108 AM |
10667 | +struct au_fidir *au_fidir_alloc(struct super_block *sb); |
10668 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr); | |
1facf9fc | 10669 | + |
4a4d8108 AM |
10670 | +void au_fi_init_once(void *_fi); |
10671 | +void au_finfo_fin(struct file *file); | |
10672 | +int au_finfo_init(struct file *file, struct au_fidir *fidir); | |
1facf9fc | 10673 | + |
4a4d8108 AM |
10674 | +/* ioctl.c */ |
10675 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg); | |
b752ccd1 AM |
10676 | +#ifdef CONFIG_COMPAT |
10677 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
10678 | + unsigned long arg); | |
10679 | +#endif | |
1facf9fc | 10680 | + |
4a4d8108 | 10681 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 10682 | + |
4a4d8108 AM |
10683 | +static inline struct au_finfo *au_fi(struct file *file) |
10684 | +{ | |
10685 | + return file->private_data; | |
10686 | +} | |
1facf9fc | 10687 | + |
4a4d8108 | 10688 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 10689 | + |
4a4d8108 AM |
10690 | +/* |
10691 | + * fi_read_lock, fi_write_lock, | |
10692 | + * fi_read_unlock, fi_write_unlock, fi_downgrade_lock | |
10693 | + */ | |
10694 | +AuSimpleRwsemFuncs(fi, struct file *f, &au_fi(f)->fi_rwsem); | |
1308ab2a | 10695 | + |
4a4d8108 AM |
10696 | +#define FiMustNoWaiters(f) AuRwMustNoWaiters(&au_fi(f)->fi_rwsem) |
10697 | +#define FiMustAnyLock(f) AuRwMustAnyLock(&au_fi(f)->fi_rwsem) | |
10698 | +#define FiMustWriteLock(f) AuRwMustWriteLock(&au_fi(f)->fi_rwsem) | |
1facf9fc | 10699 | + |
1308ab2a | 10700 | +/* ---------------------------------------------------------------------- */ |
10701 | + | |
4a4d8108 AM |
10702 | +/* todo: hard/soft set? */ |
10703 | +static inline aufs_bindex_t au_fbstart(struct file *file) | |
dece6358 | 10704 | +{ |
4a4d8108 AM |
10705 | + FiMustAnyLock(file); |
10706 | + return au_fi(file)->fi_btop; | |
10707 | +} | |
dece6358 | 10708 | + |
4a4d8108 AM |
10709 | +static inline aufs_bindex_t au_fbend_dir(struct file *file) |
10710 | +{ | |
10711 | + FiMustAnyLock(file); | |
10712 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
10713 | + return au_fi(file)->fi_hdir->fd_bbot; | |
10714 | +} | |
1facf9fc | 10715 | + |
4a4d8108 AM |
10716 | +static inline struct au_vdir *au_fvdir_cache(struct file *file) |
10717 | +{ | |
10718 | + FiMustAnyLock(file); | |
10719 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
10720 | + return au_fi(file)->fi_hdir->fd_vdir_cache; | |
10721 | +} | |
1facf9fc | 10722 | + |
4a4d8108 AM |
10723 | +static inline void au_set_fbstart(struct file *file, aufs_bindex_t bindex) |
10724 | +{ | |
10725 | + FiMustWriteLock(file); | |
10726 | + au_fi(file)->fi_btop = bindex; | |
10727 | +} | |
1facf9fc | 10728 | + |
4a4d8108 AM |
10729 | +static inline void au_set_fbend_dir(struct file *file, aufs_bindex_t bindex) |
10730 | +{ | |
10731 | + FiMustWriteLock(file); | |
10732 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
10733 | + au_fi(file)->fi_hdir->fd_bbot = bindex; | |
10734 | +} | |
1308ab2a | 10735 | + |
4a4d8108 AM |
10736 | +static inline void au_set_fvdir_cache(struct file *file, |
10737 | + struct au_vdir *vdir_cache) | |
10738 | +{ | |
10739 | + FiMustWriteLock(file); | |
10740 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
10741 | + au_fi(file)->fi_hdir->fd_vdir_cache = vdir_cache; | |
10742 | +} | |
dece6358 | 10743 | + |
4a4d8108 AM |
10744 | +static inline struct file *au_hf_top(struct file *file) |
10745 | +{ | |
10746 | + FiMustAnyLock(file); | |
10747 | + AuDebugOn(au_fi(file)->fi_hdir); | |
10748 | + return au_fi(file)->fi_htop.hf_file; | |
10749 | +} | |
1facf9fc | 10750 | + |
4a4d8108 AM |
10751 | +static inline struct file *au_hf_dir(struct file *file, aufs_bindex_t bindex) |
10752 | +{ | |
10753 | + FiMustAnyLock(file); | |
10754 | + AuDebugOn(!au_fi(file)->fi_hdir); | |
10755 | + return au_fi(file)->fi_hdir->fd_hfile[0 + bindex].hf_file; | |
dece6358 AM |
10756 | +} |
10757 | + | |
4a4d8108 AM |
10758 | +/* todo: memory barrier? */ |
10759 | +static inline unsigned int au_figen(struct file *f) | |
dece6358 | 10760 | +{ |
4a4d8108 AM |
10761 | + return atomic_read(&au_fi(f)->fi_generation); |
10762 | +} | |
dece6358 | 10763 | + |
2cbb1c4b JR |
10764 | +static inline void au_set_mmapped(struct file *f) |
10765 | +{ | |
10766 | + if (atomic_inc_return(&au_fi(f)->fi_mmapped)) | |
10767 | + return; | |
10768 | + pr_warning("fi_mmapped wrapped around\n"); | |
10769 | + while (!atomic_inc_return(&au_fi(f)->fi_mmapped)) | |
10770 | + ; | |
10771 | +} | |
10772 | + | |
10773 | +static inline void au_unset_mmapped(struct file *f) | |
10774 | +{ | |
10775 | + atomic_dec(&au_fi(f)->fi_mmapped); | |
10776 | +} | |
10777 | + | |
4a4d8108 AM |
10778 | +static inline int au_test_mmapped(struct file *f) |
10779 | +{ | |
2cbb1c4b JR |
10780 | + return atomic_read(&au_fi(f)->fi_mmapped); |
10781 | +} | |
10782 | + | |
10783 | +/* customize vma->vm_file */ | |
10784 | + | |
10785 | +static inline void au_do_vm_file_reset(struct vm_area_struct *vma, | |
10786 | + struct file *file) | |
10787 | +{ | |
53392da6 AM |
10788 | + struct file *f; |
10789 | + | |
10790 | + f = vma->vm_file; | |
2cbb1c4b JR |
10791 | + get_file(file); |
10792 | + vma->vm_file = file; | |
53392da6 | 10793 | + fput(f); |
2cbb1c4b JR |
10794 | +} |
10795 | + | |
10796 | +#ifdef CONFIG_MMU | |
10797 | +#define AuDbgVmRegion(file, vma) do {} while (0) | |
10798 | + | |
10799 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
10800 | + struct file *file) | |
10801 | +{ | |
10802 | + au_do_vm_file_reset(vma, file); | |
10803 | +} | |
10804 | +#else | |
10805 | +#define AuDbgVmRegion(file, vma) \ | |
10806 | + AuDebugOn((vma)->vm_region && (vma)->vm_region->vm_file != (file)) | |
10807 | + | |
10808 | +static inline void au_vm_file_reset(struct vm_area_struct *vma, | |
10809 | + struct file *file) | |
10810 | +{ | |
53392da6 AM |
10811 | + struct file *f; |
10812 | + | |
2cbb1c4b | 10813 | + au_do_vm_file_reset(vma, file); |
53392da6 | 10814 | + f = vma->vm_region->vm_file; |
2cbb1c4b JR |
10815 | + get_file(file); |
10816 | + vma->vm_region->vm_file = file; | |
53392da6 | 10817 | + fput(f); |
2cbb1c4b JR |
10818 | +} |
10819 | +#endif /* CONFIG_MMU */ | |
10820 | + | |
10821 | +/* handle vma->vm_prfile */ | |
10822 | +static inline void au_vm_prfile_set(struct vm_area_struct *vma, | |
10823 | + struct file *file) | |
10824 | +{ | |
10825 | +#ifdef CONFIG_AUFS_PROC_MAP | |
10826 | + get_file(file); | |
10827 | + vma->vm_prfile = file; | |
10828 | +#ifndef CONFIG_MMU | |
10829 | + get_file(file); | |
10830 | + vma->vm_region->vm_prfile = file; | |
10831 | +#endif | |
10832 | +#endif | |
4a4d8108 | 10833 | +} |
1308ab2a | 10834 | + |
4a4d8108 AM |
10835 | +#endif /* __KERNEL__ */ |
10836 | +#endif /* __AUFS_FILE_H__ */ | |
7f207e10 AM |
10837 | diff -urN /usr/share/empty/fs/aufs/finfo.c linux/fs/aufs/finfo.c |
10838 | --- /usr/share/empty/fs/aufs/finfo.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 10839 | +++ linux/fs/aufs/finfo.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 10840 | @@ -0,0 +1,153 @@ |
4a4d8108 | 10841 | +/* |
027c5e7a | 10842 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
10843 | + * |
10844 | + * This program, aufs is free software; you can redistribute it and/or modify | |
10845 | + * it under the terms of the GNU General Public License as published by | |
10846 | + * the Free Software Foundation; either version 2 of the License, or | |
10847 | + * (at your option) any later version. | |
10848 | + * | |
10849 | + * This program is distributed in the hope that it will be useful, | |
10850 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10851 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
10852 | + * GNU General Public License for more details. | |
10853 | + * | |
10854 | + * You should have received a copy of the GNU General Public License | |
10855 | + * along with this program; if not, write to the Free Software | |
10856 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
10857 | + */ | |
1308ab2a | 10858 | + |
4a4d8108 AM |
10859 | +/* |
10860 | + * file private data | |
10861 | + */ | |
1facf9fc | 10862 | + |
4a4d8108 AM |
10863 | +#include <linux/file.h> |
10864 | +#include "aufs.h" | |
1facf9fc | 10865 | + |
4a4d8108 AM |
10866 | +void au_hfput(struct au_hfile *hf, struct file *file) |
10867 | +{ | |
10868 | + /* todo: direct access f_flags */ | |
2cbb1c4b | 10869 | + if (vfsub_file_flags(file) & __FMODE_EXEC) |
4a4d8108 AM |
10870 | + allow_write_access(hf->hf_file); |
10871 | + fput(hf->hf_file); | |
10872 | + hf->hf_file = NULL; | |
e49829fe | 10873 | + atomic_dec(&hf->hf_br->br_count); |
4a4d8108 AM |
10874 | + hf->hf_br = NULL; |
10875 | +} | |
1facf9fc | 10876 | + |
4a4d8108 AM |
10877 | +void au_set_h_fptr(struct file *file, aufs_bindex_t bindex, struct file *val) |
10878 | +{ | |
10879 | + struct au_finfo *finfo = au_fi(file); | |
10880 | + struct au_hfile *hf; | |
10881 | + struct au_fidir *fidir; | |
10882 | + | |
10883 | + fidir = finfo->fi_hdir; | |
10884 | + if (!fidir) { | |
10885 | + AuDebugOn(finfo->fi_btop != bindex); | |
10886 | + hf = &finfo->fi_htop; | |
10887 | + } else | |
10888 | + hf = fidir->fd_hfile + bindex; | |
10889 | + | |
10890 | + if (hf && hf->hf_file) | |
10891 | + au_hfput(hf, file); | |
10892 | + if (val) { | |
10893 | + FiMustWriteLock(file); | |
10894 | + hf->hf_file = val; | |
10895 | + hf->hf_br = au_sbr(file->f_dentry->d_sb, bindex); | |
1308ab2a | 10896 | + } |
4a4d8108 | 10897 | +} |
1facf9fc | 10898 | + |
4a4d8108 AM |
10899 | +void au_update_figen(struct file *file) |
10900 | +{ | |
10901 | + atomic_set(&au_fi(file)->fi_generation, au_digen(file->f_dentry)); | |
10902 | + /* smp_mb(); */ /* atomic_set */ | |
1facf9fc | 10903 | +} |
10904 | + | |
4a4d8108 AM |
10905 | +/* ---------------------------------------------------------------------- */ |
10906 | + | |
4a4d8108 AM |
10907 | +struct au_fidir *au_fidir_alloc(struct super_block *sb) |
10908 | +{ | |
10909 | + struct au_fidir *fidir; | |
10910 | + int nbr; | |
10911 | + | |
10912 | + nbr = au_sbend(sb) + 1; | |
10913 | + if (nbr < 2) | |
10914 | + nbr = 2; /* initial allocate for 2 branches */ | |
10915 | + fidir = kzalloc(au_fidir_sz(nbr), GFP_NOFS); | |
10916 | + if (fidir) { | |
10917 | + fidir->fd_bbot = -1; | |
10918 | + fidir->fd_nent = nbr; | |
10919 | + fidir->fd_vdir_cache = NULL; | |
10920 | + } | |
10921 | + | |
10922 | + return fidir; | |
10923 | +} | |
10924 | + | |
10925 | +int au_fidir_realloc(struct au_finfo *finfo, int nbr) | |
10926 | +{ | |
10927 | + int err; | |
10928 | + struct au_fidir *fidir, *p; | |
10929 | + | |
10930 | + AuRwMustWriteLock(&finfo->fi_rwsem); | |
10931 | + fidir = finfo->fi_hdir; | |
10932 | + AuDebugOn(!fidir); | |
10933 | + | |
10934 | + err = -ENOMEM; | |
10935 | + p = au_kzrealloc(fidir, au_fidir_sz(fidir->fd_nent), au_fidir_sz(nbr), | |
10936 | + GFP_NOFS); | |
10937 | + if (p) { | |
10938 | + p->fd_nent = nbr; | |
10939 | + finfo->fi_hdir = p; | |
10940 | + err = 0; | |
10941 | + } | |
1facf9fc | 10942 | + |
dece6358 | 10943 | + return err; |
1facf9fc | 10944 | +} |
1308ab2a | 10945 | + |
10946 | +/* ---------------------------------------------------------------------- */ | |
10947 | + | |
4a4d8108 | 10948 | +void au_finfo_fin(struct file *file) |
1308ab2a | 10949 | +{ |
4a4d8108 AM |
10950 | + struct au_finfo *finfo; |
10951 | + | |
7f207e10 AM |
10952 | + au_nfiles_dec(file->f_dentry->d_sb); |
10953 | + | |
4a4d8108 AM |
10954 | + finfo = au_fi(file); |
10955 | + AuDebugOn(finfo->fi_hdir); | |
10956 | + AuRwDestroy(&finfo->fi_rwsem); | |
10957 | + au_cache_free_finfo(finfo); | |
1308ab2a | 10958 | +} |
1308ab2a | 10959 | + |
e49829fe | 10960 | +void au_fi_init_once(void *_finfo) |
4a4d8108 | 10961 | +{ |
e49829fe | 10962 | + struct au_finfo *finfo = _finfo; |
2cbb1c4b | 10963 | + static struct lock_class_key aufs_fi; |
1308ab2a | 10964 | + |
e49829fe JR |
10965 | + au_rw_init(&finfo->fi_rwsem); |
10966 | + au_rw_class(&finfo->fi_rwsem, &aufs_fi); | |
4a4d8108 | 10967 | +} |
1308ab2a | 10968 | + |
4a4d8108 AM |
10969 | +int au_finfo_init(struct file *file, struct au_fidir *fidir) |
10970 | +{ | |
10971 | + int err; | |
10972 | + struct au_finfo *finfo; | |
10973 | + struct dentry *dentry; | |
10974 | + | |
10975 | + err = -ENOMEM; | |
10976 | + dentry = file->f_dentry; | |
10977 | + finfo = au_cache_alloc_finfo(); | |
10978 | + if (unlikely(!finfo)) | |
10979 | + goto out; | |
10980 | + | |
10981 | + err = 0; | |
7f207e10 | 10982 | + au_nfiles_inc(dentry->d_sb); |
4a4d8108 AM |
10983 | + au_rw_write_lock(&finfo->fi_rwsem); |
10984 | + finfo->fi_btop = -1; | |
10985 | + finfo->fi_hdir = fidir; | |
10986 | + atomic_set(&finfo->fi_generation, au_digen(dentry)); | |
10987 | + /* smp_mb(); */ /* atomic_set */ | |
10988 | + | |
10989 | + file->private_data = finfo; | |
10990 | + | |
10991 | +out: | |
10992 | + return err; | |
10993 | +} | |
7f207e10 AM |
10994 | diff -urN /usr/share/empty/fs/aufs/f_op.c linux/fs/aufs/f_op.c |
10995 | --- /usr/share/empty/fs/aufs/f_op.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
10996 | +++ linux/fs/aufs/f_op.c 2011-08-24 13:30:24.731313534 +0200 |
10997 | @@ -0,0 +1,717 @@ | |
dece6358 | 10998 | +/* |
027c5e7a | 10999 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
dece6358 AM |
11000 | + * |
11001 | + * This program, aufs is free software; you can redistribute it and/or modify | |
11002 | + * it under the terms of the GNU General Public License as published by | |
11003 | + * the Free Software Foundation; either version 2 of the License, or | |
11004 | + * (at your option) any later version. | |
11005 | + * | |
11006 | + * This program is distributed in the hope that it will be useful, | |
11007 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11008 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11009 | + * GNU General Public License for more details. | |
11010 | + * | |
11011 | + * You should have received a copy of the GNU General Public License | |
11012 | + * along with this program; if not, write to the Free Software | |
11013 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
11014 | + */ | |
1facf9fc | 11015 | + |
11016 | +/* | |
4a4d8108 | 11017 | + * file and vm operations |
1facf9fc | 11018 | + */ |
dece6358 AM |
11019 | + |
11020 | +#include <linux/file.h> | |
4a4d8108 AM |
11021 | +#include <linux/fs_stack.h> |
11022 | +#include <linux/mman.h> | |
11023 | +#include <linux/mm.h> | |
11024 | +#include <linux/security.h> | |
dece6358 AM |
11025 | +#include "aufs.h" |
11026 | + | |
4a4d8108 | 11027 | +int au_do_open_nondir(struct file *file, int flags) |
1facf9fc | 11028 | +{ |
4a4d8108 AM |
11029 | + int err; |
11030 | + aufs_bindex_t bindex; | |
11031 | + struct file *h_file; | |
11032 | + struct dentry *dentry; | |
11033 | + struct au_finfo *finfo; | |
11034 | + | |
11035 | + FiMustWriteLock(file); | |
11036 | + | |
4a4d8108 | 11037 | + dentry = file->f_dentry; |
027c5e7a AM |
11038 | + err = au_d_alive(dentry); |
11039 | + if (unlikely(err)) | |
11040 | + goto out; | |
11041 | + | |
4a4d8108 AM |
11042 | + finfo = au_fi(file); |
11043 | + memset(&finfo->fi_htop, 0, sizeof(finfo->fi_htop)); | |
2cbb1c4b | 11044 | + atomic_set(&finfo->fi_mmapped, 0); |
4a4d8108 AM |
11045 | + bindex = au_dbstart(dentry); |
11046 | + h_file = au_h_open(dentry, bindex, flags, file); | |
11047 | + if (IS_ERR(h_file)) | |
11048 | + err = PTR_ERR(h_file); | |
11049 | + else { | |
11050 | + au_set_fbstart(file, bindex); | |
11051 | + au_set_h_fptr(file, bindex, h_file); | |
11052 | + au_update_figen(file); | |
11053 | + /* todo: necessary? */ | |
11054 | + /* file->f_ra = h_file->f_ra; */ | |
11055 | + } | |
027c5e7a AM |
11056 | + |
11057 | +out: | |
4a4d8108 | 11058 | + return err; |
1facf9fc | 11059 | +} |
11060 | + | |
4a4d8108 AM |
11061 | +static int aufs_open_nondir(struct inode *inode __maybe_unused, |
11062 | + struct file *file) | |
1facf9fc | 11063 | +{ |
4a4d8108 | 11064 | + int err; |
1308ab2a | 11065 | + struct super_block *sb; |
1facf9fc | 11066 | + |
2cbb1c4b | 11067 | + AuDbg("%.*s, f_flags 0x%x, f_mode 0x%x\n", |
4a4d8108 AM |
11068 | + AuDLNPair(file->f_dentry), vfsub_file_flags(file), |
11069 | + file->f_mode); | |
1facf9fc | 11070 | + |
4a4d8108 AM |
11071 | + sb = file->f_dentry->d_sb; |
11072 | + si_read_lock(sb, AuLock_FLUSH); | |
11073 | + err = au_do_open(file, au_do_open_nondir, /*fidir*/NULL); | |
11074 | + si_read_unlock(sb); | |
11075 | + return err; | |
11076 | +} | |
1facf9fc | 11077 | + |
4a4d8108 AM |
11078 | +int aufs_release_nondir(struct inode *inode __maybe_unused, struct file *file) |
11079 | +{ | |
11080 | + struct au_finfo *finfo; | |
11081 | + aufs_bindex_t bindex; | |
1facf9fc | 11082 | + |
4a4d8108 AM |
11083 | + finfo = au_fi(file); |
11084 | + bindex = finfo->fi_btop; | |
0c5527e5 AM |
11085 | + if (bindex >= 0) { |
11086 | + /* remove me from sb->s_files */ | |
11087 | + file_sb_list_del(file); | |
4a4d8108 | 11088 | + au_set_h_fptr(file, bindex, NULL); |
0c5527e5 | 11089 | + } |
7f207e10 | 11090 | + |
4a4d8108 AM |
11091 | + au_finfo_fin(file); |
11092 | + return 0; | |
1facf9fc | 11093 | +} |
11094 | + | |
4a4d8108 AM |
11095 | +/* ---------------------------------------------------------------------- */ |
11096 | + | |
11097 | +static int au_do_flush_nondir(struct file *file, fl_owner_t id) | |
dece6358 | 11098 | +{ |
1308ab2a | 11099 | + int err; |
4a4d8108 AM |
11100 | + struct file *h_file; |
11101 | + | |
11102 | + err = 0; | |
11103 | + h_file = au_hf_top(file); | |
11104 | + if (h_file) | |
11105 | + err = vfsub_flush(h_file, id); | |
11106 | + return err; | |
11107 | +} | |
11108 | + | |
11109 | +static int aufs_flush_nondir(struct file *file, fl_owner_t id) | |
11110 | +{ | |
11111 | + return au_do_flush(file, id, au_do_flush_nondir); | |
11112 | +} | |
11113 | + | |
11114 | +/* ---------------------------------------------------------------------- */ | |
11115 | + | |
11116 | +static ssize_t aufs_read(struct file *file, char __user *buf, size_t count, | |
11117 | + loff_t *ppos) | |
11118 | +{ | |
11119 | + ssize_t err; | |
dece6358 | 11120 | + struct dentry *dentry; |
4a4d8108 | 11121 | + struct file *h_file; |
dece6358 | 11122 | + struct super_block *sb; |
1facf9fc | 11123 | + |
dece6358 AM |
11124 | + dentry = file->f_dentry; |
11125 | + sb = dentry->d_sb; | |
e49829fe | 11126 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 | 11127 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
dece6358 AM |
11128 | + if (unlikely(err)) |
11129 | + goto out; | |
1facf9fc | 11130 | + |
4a4d8108 AM |
11131 | + h_file = au_hf_top(file); |
11132 | + err = vfsub_read_u(h_file, buf, count, ppos); | |
11133 | + /* todo: necessary? */ | |
11134 | + /* file->f_ra = h_file->f_ra; */ | |
11135 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
1308ab2a | 11136 | + |
4a4d8108 AM |
11137 | + di_read_unlock(dentry, AuLock_IR); |
11138 | + fi_read_unlock(file); | |
4f0767ce | 11139 | +out: |
dece6358 AM |
11140 | + si_read_unlock(sb); |
11141 | + return err; | |
11142 | +} | |
1facf9fc | 11143 | + |
e49829fe JR |
11144 | +/* |
11145 | + * todo: very ugly | |
11146 | + * it locks both of i_mutex and si_rwsem for read in safe. | |
11147 | + * if the plink maintenance mode continues forever (that is the problem), | |
11148 | + * may loop forever. | |
11149 | + */ | |
11150 | +static void au_mtx_and_read_lock(struct inode *inode) | |
11151 | +{ | |
11152 | + int err; | |
11153 | + struct super_block *sb = inode->i_sb; | |
11154 | + | |
11155 | + while (1) { | |
11156 | + mutex_lock(&inode->i_mutex); | |
11157 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); | |
11158 | + if (!err) | |
11159 | + break; | |
11160 | + mutex_unlock(&inode->i_mutex); | |
11161 | + si_read_lock(sb, AuLock_NOPLMW); | |
11162 | + si_read_unlock(sb); | |
11163 | + } | |
11164 | +} | |
11165 | + | |
4a4d8108 AM |
11166 | +static ssize_t aufs_write(struct file *file, const char __user *ubuf, |
11167 | + size_t count, loff_t *ppos) | |
dece6358 | 11168 | +{ |
4a4d8108 AM |
11169 | + ssize_t err; |
11170 | + struct au_pin pin; | |
dece6358 | 11171 | + struct dentry *dentry; |
4a4d8108 | 11172 | + struct inode *inode; |
4a4d8108 AM |
11173 | + struct file *h_file; |
11174 | + char __user *buf = (char __user *)ubuf; | |
1facf9fc | 11175 | + |
dece6358 | 11176 | + dentry = file->f_dentry; |
4a4d8108 | 11177 | + inode = dentry->d_inode; |
e49829fe | 11178 | + au_mtx_and_read_lock(inode); |
1facf9fc | 11179 | + |
4a4d8108 AM |
11180 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
11181 | + if (unlikely(err)) | |
11182 | + goto out; | |
1facf9fc | 11183 | + |
4a4d8108 AM |
11184 | + err = au_ready_to_write(file, -1, &pin); |
11185 | + di_downgrade_lock(dentry, AuLock_IR); | |
11186 | + if (unlikely(err)) | |
11187 | + goto out_unlock; | |
1facf9fc | 11188 | + |
4a4d8108 AM |
11189 | + h_file = au_hf_top(file); |
11190 | + au_unpin(&pin); | |
11191 | + err = vfsub_write_u(h_file, buf, count, ppos); | |
11192 | + au_cpup_attr_timesizes(inode); | |
11193 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 11194 | + |
4f0767ce | 11195 | +out_unlock: |
4a4d8108 AM |
11196 | + di_read_unlock(dentry, AuLock_IR); |
11197 | + fi_write_unlock(file); | |
4f0767ce | 11198 | +out: |
e49829fe | 11199 | + si_read_unlock(inode->i_sb); |
4a4d8108 | 11200 | + mutex_unlock(&inode->i_mutex); |
dece6358 AM |
11201 | + return err; |
11202 | +} | |
1facf9fc | 11203 | + |
4a4d8108 AM |
11204 | +static ssize_t au_do_aio(struct file *h_file, int rw, struct kiocb *kio, |
11205 | + const struct iovec *iov, unsigned long nv, loff_t pos) | |
dece6358 | 11206 | +{ |
4a4d8108 AM |
11207 | + ssize_t err; |
11208 | + struct file *file; | |
11209 | + ssize_t (*func)(struct kiocb *, const struct iovec *, unsigned long, | |
11210 | + loff_t); | |
1facf9fc | 11211 | + |
4a4d8108 AM |
11212 | + err = security_file_permission(h_file, rw); |
11213 | + if (unlikely(err)) | |
11214 | + goto out; | |
1facf9fc | 11215 | + |
4a4d8108 AM |
11216 | + err = -ENOSYS; |
11217 | + func = NULL; | |
11218 | + if (rw == MAY_READ) | |
11219 | + func = h_file->f_op->aio_read; | |
11220 | + else if (rw == MAY_WRITE) | |
11221 | + func = h_file->f_op->aio_write; | |
11222 | + if (func) { | |
11223 | + file = kio->ki_filp; | |
11224 | + kio->ki_filp = h_file; | |
2cbb1c4b | 11225 | + lockdep_off(); |
4a4d8108 | 11226 | + err = func(kio, iov, nv, pos); |
2cbb1c4b | 11227 | + lockdep_on(); |
4a4d8108 AM |
11228 | + kio->ki_filp = file; |
11229 | + } else | |
11230 | + /* currently there is no such fs */ | |
11231 | + WARN_ON_ONCE(1); | |
1facf9fc | 11232 | + |
4f0767ce | 11233 | +out: |
dece6358 AM |
11234 | + return err; |
11235 | +} | |
1facf9fc | 11236 | + |
4a4d8108 AM |
11237 | +static ssize_t aufs_aio_read(struct kiocb *kio, const struct iovec *iov, |
11238 | + unsigned long nv, loff_t pos) | |
1facf9fc | 11239 | +{ |
4a4d8108 AM |
11240 | + ssize_t err; |
11241 | + struct file *file, *h_file; | |
11242 | + struct dentry *dentry; | |
dece6358 | 11243 | + struct super_block *sb; |
1facf9fc | 11244 | + |
4a4d8108 | 11245 | + file = kio->ki_filp; |
dece6358 | 11246 | + dentry = file->f_dentry; |
1308ab2a | 11247 | + sb = dentry->d_sb; |
e49829fe | 11248 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 AM |
11249 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
11250 | + if (unlikely(err)) | |
11251 | + goto out; | |
11252 | + | |
11253 | + h_file = au_hf_top(file); | |
11254 | + err = au_do_aio(h_file, MAY_READ, kio, iov, nv, pos); | |
11255 | + /* todo: necessary? */ | |
11256 | + /* file->f_ra = h_file->f_ra; */ | |
11257 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
11258 | + di_read_unlock(dentry, AuLock_IR); | |
11259 | + fi_read_unlock(file); | |
1facf9fc | 11260 | + |
4f0767ce | 11261 | +out: |
4a4d8108 | 11262 | + si_read_unlock(sb); |
1308ab2a | 11263 | + return err; |
11264 | +} | |
1facf9fc | 11265 | + |
4a4d8108 AM |
11266 | +static ssize_t aufs_aio_write(struct kiocb *kio, const struct iovec *iov, |
11267 | + unsigned long nv, loff_t pos) | |
1308ab2a | 11268 | +{ |
4a4d8108 AM |
11269 | + ssize_t err; |
11270 | + struct au_pin pin; | |
11271 | + struct dentry *dentry; | |
11272 | + struct inode *inode; | |
4a4d8108 | 11273 | + struct file *file, *h_file; |
1308ab2a | 11274 | + |
4a4d8108 | 11275 | + file = kio->ki_filp; |
1308ab2a | 11276 | + dentry = file->f_dentry; |
1308ab2a | 11277 | + inode = dentry->d_inode; |
e49829fe JR |
11278 | + au_mtx_and_read_lock(inode); |
11279 | + | |
4a4d8108 AM |
11280 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
11281 | + if (unlikely(err)) | |
1308ab2a | 11282 | + goto out; |
1facf9fc | 11283 | + |
4a4d8108 AM |
11284 | + err = au_ready_to_write(file, -1, &pin); |
11285 | + di_downgrade_lock(dentry, AuLock_IR); | |
dece6358 | 11286 | + if (unlikely(err)) |
4a4d8108 | 11287 | + goto out_unlock; |
1facf9fc | 11288 | + |
4a4d8108 AM |
11289 | + au_unpin(&pin); |
11290 | + h_file = au_hf_top(file); | |
11291 | + err = au_do_aio(h_file, MAY_WRITE, kio, iov, nv, pos); | |
11292 | + au_cpup_attr_timesizes(inode); | |
11293 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 11294 | + |
4f0767ce | 11295 | +out_unlock: |
4a4d8108 AM |
11296 | + di_read_unlock(dentry, AuLock_IR); |
11297 | + fi_write_unlock(file); | |
4f0767ce | 11298 | +out: |
e49829fe | 11299 | + si_read_unlock(inode->i_sb); |
4a4d8108 | 11300 | + mutex_unlock(&inode->i_mutex); |
dece6358 | 11301 | + return err; |
1facf9fc | 11302 | +} |
11303 | + | |
4a4d8108 AM |
11304 | +static ssize_t aufs_splice_read(struct file *file, loff_t *ppos, |
11305 | + struct pipe_inode_info *pipe, size_t len, | |
11306 | + unsigned int flags) | |
1facf9fc | 11307 | +{ |
4a4d8108 AM |
11308 | + ssize_t err; |
11309 | + struct file *h_file; | |
11310 | + struct dentry *dentry; | |
dece6358 | 11311 | + struct super_block *sb; |
1facf9fc | 11312 | + |
dece6358 | 11313 | + dentry = file->f_dentry; |
dece6358 | 11314 | + sb = dentry->d_sb; |
e49829fe | 11315 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 AM |
11316 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
11317 | + if (unlikely(err)) | |
dece6358 | 11318 | + goto out; |
1facf9fc | 11319 | + |
4a4d8108 AM |
11320 | + err = -EINVAL; |
11321 | + h_file = au_hf_top(file); | |
11322 | + if (au_test_loopback_kthread()) { | |
87a755f4 AM |
11323 | + au_warn_loopback(h_file->f_dentry->d_sb); |
11324 | + if (file->f_mapping != h_file->f_mapping) { | |
11325 | + file->f_mapping = h_file->f_mapping; | |
11326 | + smp_mb(); /* unnecessary? */ | |
11327 | + } | |
1308ab2a | 11328 | + } |
4a4d8108 AM |
11329 | + err = vfsub_splice_to(h_file, ppos, pipe, len, flags); |
11330 | + /* todo: necessasry? */ | |
11331 | + /* file->f_ra = h_file->f_ra; */ | |
11332 | + fsstack_copy_attr_atime(dentry->d_inode, h_file->f_dentry->d_inode); | |
1facf9fc | 11333 | + |
4a4d8108 AM |
11334 | + di_read_unlock(dentry, AuLock_IR); |
11335 | + fi_read_unlock(file); | |
1facf9fc | 11336 | + |
4f0767ce | 11337 | +out: |
4a4d8108 | 11338 | + si_read_unlock(sb); |
dece6358 | 11339 | + return err; |
1facf9fc | 11340 | +} |
11341 | + | |
4a4d8108 AM |
11342 | +static ssize_t |
11343 | +aufs_splice_write(struct pipe_inode_info *pipe, struct file *file, loff_t *ppos, | |
11344 | + size_t len, unsigned int flags) | |
1facf9fc | 11345 | +{ |
4a4d8108 AM |
11346 | + ssize_t err; |
11347 | + struct au_pin pin; | |
11348 | + struct dentry *dentry; | |
11349 | + struct inode *inode; | |
4a4d8108 | 11350 | + struct file *h_file; |
1facf9fc | 11351 | + |
4a4d8108 AM |
11352 | + dentry = file->f_dentry; |
11353 | + inode = dentry->d_inode; | |
e49829fe | 11354 | + au_mtx_and_read_lock(inode); |
4a4d8108 AM |
11355 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
11356 | + if (unlikely(err)) | |
11357 | + goto out; | |
1facf9fc | 11358 | + |
4a4d8108 AM |
11359 | + err = au_ready_to_write(file, -1, &pin); |
11360 | + di_downgrade_lock(dentry, AuLock_IR); | |
11361 | + if (unlikely(err)) | |
11362 | + goto out_unlock; | |
1facf9fc | 11363 | + |
4a4d8108 AM |
11364 | + h_file = au_hf_top(file); |
11365 | + au_unpin(&pin); | |
11366 | + err = vfsub_splice_from(pipe, h_file, ppos, len, flags); | |
11367 | + au_cpup_attr_timesizes(inode); | |
11368 | + inode->i_mode = h_file->f_dentry->d_inode->i_mode; | |
1facf9fc | 11369 | + |
4f0767ce | 11370 | +out_unlock: |
4a4d8108 AM |
11371 | + di_read_unlock(dentry, AuLock_IR); |
11372 | + fi_write_unlock(file); | |
4f0767ce | 11373 | +out: |
e49829fe | 11374 | + si_read_unlock(inode->i_sb); |
4a4d8108 AM |
11375 | + mutex_unlock(&inode->i_mutex); |
11376 | + return err; | |
11377 | +} | |
1facf9fc | 11378 | + |
4a4d8108 AM |
11379 | +/* ---------------------------------------------------------------------- */ |
11380 | + | |
4a4d8108 AM |
11381 | +/* cf. linux/include/linux/mman.h: calc_vm_prot_bits() */ |
11382 | +#define AuConv_VM_PROT(f, b) _calc_vm_trans(f, VM_##b, PROT_##b) | |
1308ab2a | 11383 | + |
4a4d8108 | 11384 | +static unsigned long au_arch_prot_conv(unsigned long flags) |
dece6358 | 11385 | +{ |
4a4d8108 AM |
11386 | + /* currently ppc64 only */ |
11387 | +#ifdef CONFIG_PPC64 | |
11388 | + /* cf. linux/arch/powerpc/include/asm/mman.h */ | |
11389 | + AuDebugOn(arch_calc_vm_prot_bits(-1) != VM_SAO); | |
11390 | + return AuConv_VM_PROT(flags, SAO); | |
11391 | +#else | |
11392 | + AuDebugOn(arch_calc_vm_prot_bits(-1)); | |
11393 | + return 0; | |
11394 | +#endif | |
dece6358 AM |
11395 | +} |
11396 | + | |
4a4d8108 | 11397 | +static unsigned long au_prot_conv(unsigned long flags) |
dece6358 | 11398 | +{ |
4a4d8108 AM |
11399 | + return AuConv_VM_PROT(flags, READ) |
11400 | + | AuConv_VM_PROT(flags, WRITE) | |
11401 | + | AuConv_VM_PROT(flags, EXEC) | |
11402 | + | au_arch_prot_conv(flags); | |
dece6358 AM |
11403 | +} |
11404 | + | |
4a4d8108 AM |
11405 | +/* cf. linux/include/linux/mman.h: calc_vm_flag_bits() */ |
11406 | +#define AuConv_VM_MAP(f, b) _calc_vm_trans(f, VM_##b, MAP_##b) | |
dece6358 | 11407 | + |
4a4d8108 | 11408 | +static unsigned long au_flag_conv(unsigned long flags) |
dece6358 | 11409 | +{ |
4a4d8108 AM |
11410 | + return AuConv_VM_MAP(flags, GROWSDOWN) |
11411 | + | AuConv_VM_MAP(flags, DENYWRITE) | |
11412 | + | AuConv_VM_MAP(flags, EXECUTABLE) | |
11413 | + | AuConv_VM_MAP(flags, LOCKED); | |
dece6358 | 11414 | +} |
1308ab2a | 11415 | +/* |
4a4d8108 AM |
11416 | + * This is another ugly approach to keep the lock order, particularly |
11417 | + * mm->mmap_sem and aufs rwsem. The previous approach was reverted and you can | |
11418 | + * find it in git-log, if you want. | |
1308ab2a | 11419 | + * |
4a4d8108 AM |
11420 | + * native readdir: i_mutex, copy_to_user, mmap_sem |
11421 | + * aufs readdir: i_mutex, rwsem, nested-i_mutex, copy_to_user, mmap_sem | |
1308ab2a | 11422 | + * |
4a4d8108 AM |
11423 | + * Before aufs_mmap() mmap_sem is acquired already, but aufs_mmap() has to |
11424 | + * acquire aufs rwsem. It introduces a circular locking dependency. | |
11425 | + * To address this problem, aufs_mmap() delegates the part which requires aufs | |
11426 | + * rwsem to its internal workqueue. | |
1308ab2a | 11427 | + */ |
11428 | + | |
4a4d8108 AM |
11429 | +struct au_mmap_pre_args { |
11430 | + /* input */ | |
11431 | + struct file *file; | |
11432 | + struct vm_area_struct *vma; | |
1308ab2a | 11433 | + |
4a4d8108 AM |
11434 | + /* output */ |
11435 | + int *errp; | |
11436 | + struct file *h_file; | |
11437 | + struct au_branch *br; | |
4a4d8108 | 11438 | +}; |
dece6358 | 11439 | + |
4a4d8108 | 11440 | +static int au_mmap_pre(struct file *file, struct vm_area_struct *vma, |
2cbb1c4b | 11441 | + struct file **h_file, struct au_branch **br) |
dece6358 | 11442 | +{ |
4a4d8108 AM |
11443 | + int err; |
11444 | + aufs_bindex_t bstart; | |
11445 | + const unsigned char wlock | |
11446 | + = !!(file->f_mode & FMODE_WRITE) && (vma->vm_flags & VM_SHARED); | |
11447 | + struct dentry *dentry; | |
11448 | + struct super_block *sb; | |
1308ab2a | 11449 | + |
4a4d8108 AM |
11450 | + dentry = file->f_dentry; |
11451 | + sb = dentry->d_sb; | |
e49829fe | 11452 | + si_read_lock(sb, AuLock_NOPLMW); |
4a4d8108 AM |
11453 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
11454 | + if (unlikely(err)) | |
11455 | + goto out; | |
11456 | + | |
4a4d8108 AM |
11457 | + if (wlock) { |
11458 | + struct au_pin pin; | |
11459 | + | |
11460 | + err = au_ready_to_write(file, -1, &pin); | |
11461 | + di_write_unlock(dentry); | |
11462 | + if (unlikely(err)) | |
11463 | + goto out_unlock; | |
11464 | + au_unpin(&pin); | |
11465 | + } else | |
11466 | + di_write_unlock(dentry); | |
11467 | + bstart = au_fbstart(file); | |
11468 | + *br = au_sbr(sb, bstart); | |
11469 | + *h_file = au_hf_top(file); | |
11470 | + get_file(*h_file); | |
2cbb1c4b | 11471 | + au_set_mmapped(file); |
4a4d8108 AM |
11472 | + |
11473 | +out_unlock: | |
11474 | + fi_write_unlock(file); | |
11475 | +out: | |
11476 | + si_read_unlock(sb); | |
11477 | + return err; | |
dece6358 AM |
11478 | +} |
11479 | + | |
4a4d8108 | 11480 | +static void au_call_mmap_pre(void *args) |
dece6358 | 11481 | +{ |
4a4d8108 | 11482 | + struct au_mmap_pre_args *a = args; |
2cbb1c4b | 11483 | + *a->errp = au_mmap_pre(a->file, a->vma, &a->h_file, &a->br); |
dece6358 AM |
11484 | +} |
11485 | + | |
4a4d8108 | 11486 | +static int aufs_mmap(struct file *file, struct vm_area_struct *vma) |
dece6358 | 11487 | +{ |
4a4d8108 | 11488 | + int err, wkq_err; |
2cbb1c4b | 11489 | + unsigned long prot; |
4a4d8108 AM |
11490 | + struct au_mmap_pre_args args = { |
11491 | + .file = file, | |
11492 | + .vma = vma, | |
11493 | + .errp = &err | |
11494 | + }; | |
11495 | + | |
2cbb1c4b | 11496 | + AuDbgVmRegion(file, vma); |
b752ccd1 | 11497 | + wkq_err = au_wkq_wait_pre(au_call_mmap_pre, &args); |
4a4d8108 AM |
11498 | + if (unlikely(wkq_err)) |
11499 | + err = wkq_err; | |
11500 | + if (unlikely(err)) | |
11501 | + goto out; | |
1308ab2a | 11502 | + |
2cbb1c4b JR |
11503 | + au_vm_file_reset(vma, args.h_file); |
11504 | + prot = au_prot_conv(vma->vm_flags); | |
11505 | + err = security_file_mmap(args.h_file, /*reqprot*/prot, prot, | |
11506 | + au_flag_conv(vma->vm_flags), vma->vm_start, 0); | |
4a4d8108 | 11507 | + if (unlikely(err)) |
2cbb1c4b | 11508 | + goto out_reset; |
4a4d8108 | 11509 | + |
2cbb1c4b JR |
11510 | + err = args.h_file->f_op->mmap(args.h_file, vma); |
11511 | + if (unlikely(err)) | |
11512 | + goto out_reset; | |
4a4d8108 | 11513 | + |
2cbb1c4b | 11514 | + au_vm_prfile_set(vma, file); |
4a4d8108 AM |
11515 | + vfsub_file_accessed(args.h_file); |
11516 | + /* update without lock, I don't think it a problem */ | |
2cbb1c4b JR |
11517 | + fsstack_copy_attr_atime(file->f_dentry->d_inode, |
11518 | + args.h_file->f_dentry->d_inode); | |
11519 | + goto out_fput; /* success */ | |
4a4d8108 | 11520 | + |
2cbb1c4b JR |
11521 | +out_reset: |
11522 | + au_unset_mmapped(file); | |
11523 | + au_vm_file_reset(vma, file); | |
11524 | +out_fput: | |
4a4d8108 | 11525 | + fput(args.h_file); |
4f0767ce | 11526 | +out: |
4a4d8108 AM |
11527 | + return err; |
11528 | +} | |
11529 | + | |
11530 | +/* ---------------------------------------------------------------------- */ | |
11531 | + | |
b752ccd1 | 11532 | +static int aufs_fsync_nondir(struct file *file, int datasync) |
4a4d8108 AM |
11533 | +{ |
11534 | + int err; | |
11535 | + struct au_pin pin; | |
b752ccd1 | 11536 | + struct dentry *dentry; |
4a4d8108 AM |
11537 | + struct inode *inode; |
11538 | + struct file *h_file; | |
11539 | + struct super_block *sb; | |
11540 | + | |
b752ccd1 | 11541 | + dentry = file->f_dentry; |
4a4d8108 AM |
11542 | + inode = dentry->d_inode; |
11543 | + IMustLock(file->f_mapping->host); | |
11544 | + if (inode != file->f_mapping->host) { | |
11545 | + mutex_unlock(&file->f_mapping->host->i_mutex); | |
11546 | + mutex_lock(&inode->i_mutex); | |
11547 | + } | |
11548 | + IMustLock(inode); | |
11549 | + | |
11550 | + sb = dentry->d_sb; | |
e49829fe JR |
11551 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
11552 | + if (unlikely(err)) | |
11553 | + goto out; | |
4a4d8108 AM |
11554 | + |
11555 | + err = 0; /* -EBADF; */ /* posix? */ | |
11556 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
e49829fe | 11557 | + goto out_si; |
4a4d8108 AM |
11558 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); |
11559 | + if (unlikely(err)) | |
e49829fe | 11560 | + goto out_si; |
4a4d8108 AM |
11561 | + |
11562 | + err = au_ready_to_write(file, -1, &pin); | |
11563 | + di_downgrade_lock(dentry, AuLock_IR); | |
11564 | + if (unlikely(err)) | |
11565 | + goto out_unlock; | |
11566 | + au_unpin(&pin); | |
11567 | + | |
11568 | + err = -EINVAL; | |
11569 | + h_file = au_hf_top(file); | |
53392da6 AM |
11570 | + err = vfsub_fsync(h_file, &h_file->f_path, datasync); |
11571 | + au_cpup_attr_timesizes(inode); | |
4a4d8108 | 11572 | + |
4f0767ce | 11573 | +out_unlock: |
4a4d8108 | 11574 | + di_read_unlock(dentry, AuLock_IR); |
1308ab2a | 11575 | + fi_write_unlock(file); |
e49829fe | 11576 | +out_si: |
953406b4 | 11577 | + si_read_unlock(sb); |
e49829fe | 11578 | +out: |
4a4d8108 AM |
11579 | + if (inode != file->f_mapping->host) { |
11580 | + mutex_unlock(&inode->i_mutex); | |
11581 | + mutex_lock(&file->f_mapping->host->i_mutex); | |
11582 | + } | |
11583 | + return err; | |
dece6358 AM |
11584 | +} |
11585 | + | |
4a4d8108 AM |
11586 | +/* no one supports this operation, currently */ |
11587 | +#if 0 | |
11588 | +static int aufs_aio_fsync_nondir(struct kiocb *kio, int datasync) | |
dece6358 | 11589 | +{ |
4a4d8108 AM |
11590 | + int err; |
11591 | + struct au_pin pin; | |
1308ab2a | 11592 | + struct dentry *dentry; |
4a4d8108 AM |
11593 | + struct inode *inode; |
11594 | + struct file *file, *h_file; | |
1308ab2a | 11595 | + |
4a4d8108 | 11596 | + file = kio->ki_filp; |
1308ab2a | 11597 | + dentry = file->f_dentry; |
4a4d8108 | 11598 | + inode = dentry->d_inode; |
e49829fe | 11599 | + au_mtx_and_read_lock(inode); |
4a4d8108 AM |
11600 | + |
11601 | + err = 0; /* -EBADF; */ /* posix? */ | |
11602 | + if (unlikely(!(file->f_mode & FMODE_WRITE))) | |
11603 | + goto out; | |
11604 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); | |
11605 | + if (unlikely(err)) | |
1308ab2a | 11606 | + goto out; |
11607 | + | |
4a4d8108 AM |
11608 | + err = au_ready_to_write(file, -1, &pin); |
11609 | + di_downgrade_lock(dentry, AuLock_IR); | |
11610 | + if (unlikely(err)) | |
11611 | + goto out_unlock; | |
11612 | + au_unpin(&pin); | |
1308ab2a | 11613 | + |
4a4d8108 AM |
11614 | + err = -ENOSYS; |
11615 | + h_file = au_hf_top(file); | |
11616 | + if (h_file->f_op && h_file->f_op->aio_fsync) { | |
11617 | + struct dentry *h_d; | |
11618 | + struct mutex *h_mtx; | |
1308ab2a | 11619 | + |
4a4d8108 AM |
11620 | + h_d = h_file->f_dentry; |
11621 | + h_mtx = &h_d->d_inode->i_mutex; | |
11622 | + if (!is_sync_kiocb(kio)) { | |
11623 | + get_file(h_file); | |
11624 | + fput(file); | |
11625 | + } | |
11626 | + kio->ki_filp = h_file; | |
11627 | + err = h_file->f_op->aio_fsync(kio, datasync); | |
11628 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
11629 | + if (!err) | |
11630 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); | |
11631 | + /*ignore*/ | |
11632 | + au_cpup_attr_timesizes(inode); | |
11633 | + mutex_unlock(h_mtx); | |
11634 | + } | |
1308ab2a | 11635 | + |
4f0767ce | 11636 | +out_unlock: |
4a4d8108 AM |
11637 | + di_read_unlock(dentry, AuLock_IR); |
11638 | + fi_write_unlock(file); | |
4f0767ce | 11639 | +out: |
e49829fe | 11640 | + si_read_unlock(inode->sb); |
4a4d8108 AM |
11641 | + mutex_unlock(&inode->i_mutex); |
11642 | + return err; | |
dece6358 | 11643 | +} |
4a4d8108 | 11644 | +#endif |
dece6358 | 11645 | + |
4a4d8108 | 11646 | +static int aufs_fasync(int fd, struct file *file, int flag) |
dece6358 | 11647 | +{ |
4a4d8108 AM |
11648 | + int err; |
11649 | + struct file *h_file; | |
11650 | + struct dentry *dentry; | |
11651 | + struct super_block *sb; | |
1308ab2a | 11652 | + |
4a4d8108 AM |
11653 | + dentry = file->f_dentry; |
11654 | + sb = dentry->d_sb; | |
e49829fe | 11655 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
4a4d8108 AM |
11656 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
11657 | + if (unlikely(err)) | |
11658 | + goto out; | |
11659 | + | |
11660 | + h_file = au_hf_top(file); | |
11661 | + if (h_file->f_op && h_file->f_op->fasync) | |
11662 | + err = h_file->f_op->fasync(fd, h_file, flag); | |
11663 | + | |
11664 | + di_read_unlock(dentry, AuLock_IR); | |
11665 | + fi_read_unlock(file); | |
1308ab2a | 11666 | + |
4f0767ce | 11667 | +out: |
4a4d8108 | 11668 | + si_read_unlock(sb); |
1308ab2a | 11669 | + return err; |
dece6358 | 11670 | +} |
4a4d8108 AM |
11671 | + |
11672 | +/* ---------------------------------------------------------------------- */ | |
11673 | + | |
11674 | +/* no one supports this operation, currently */ | |
11675 | +#if 0 | |
11676 | +static ssize_t aufs_sendpage(struct file *file, struct page *page, int offset, | |
11677 | + size_t len, loff_t *pos , int more) | |
11678 | +{ | |
11679 | +} | |
11680 | +#endif | |
11681 | + | |
11682 | +/* ---------------------------------------------------------------------- */ | |
11683 | + | |
11684 | +const struct file_operations aufs_file_fop = { | |
11685 | + .owner = THIS_MODULE, | |
2cbb1c4b | 11686 | + |
027c5e7a | 11687 | + .llseek = default_llseek, |
4a4d8108 AM |
11688 | + |
11689 | + .read = aufs_read, | |
11690 | + .write = aufs_write, | |
11691 | + .aio_read = aufs_aio_read, | |
11692 | + .aio_write = aufs_aio_write, | |
11693 | +#ifdef CONFIG_AUFS_POLL | |
11694 | + .poll = aufs_poll, | |
11695 | +#endif | |
11696 | + .unlocked_ioctl = aufs_ioctl_nondir, | |
b752ccd1 AM |
11697 | +#ifdef CONFIG_COMPAT |
11698 | + .compat_ioctl = aufs_ioctl_nondir, /* same */ | |
11699 | +#endif | |
4a4d8108 AM |
11700 | + .mmap = aufs_mmap, |
11701 | + .open = aufs_open_nondir, | |
11702 | + .flush = aufs_flush_nondir, | |
11703 | + .release = aufs_release_nondir, | |
11704 | + .fsync = aufs_fsync_nondir, | |
11705 | + /* .aio_fsync = aufs_aio_fsync_nondir, */ | |
11706 | + .fasync = aufs_fasync, | |
11707 | + /* .sendpage = aufs_sendpage, */ | |
11708 | + .splice_write = aufs_splice_write, | |
11709 | + .splice_read = aufs_splice_read, | |
11710 | +#if 0 | |
11711 | + .aio_splice_write = aufs_aio_splice_write, | |
11712 | + .aio_splice_read = aufs_aio_splice_read | |
11713 | +#endif | |
11714 | +}; | |
7f207e10 AM |
11715 | diff -urN /usr/share/empty/fs/aufs/f_op_sp.c linux/fs/aufs/f_op_sp.c |
11716 | --- /usr/share/empty/fs/aufs/f_op_sp.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 11717 | +++ linux/fs/aufs/f_op_sp.c 2011-08-24 13:30:24.731313534 +0200 |
e49829fe | 11718 | @@ -0,0 +1,299 @@ |
1308ab2a | 11719 | +/* |
027c5e7a | 11720 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1308ab2a | 11721 | + * |
11722 | + * This program, aufs is free software; you can redistribute it and/or modify | |
11723 | + * it under the terms of the GNU General Public License as published by | |
11724 | + * the Free Software Foundation; either version 2 of the License, or | |
11725 | + * (at your option) any later version. | |
11726 | + * | |
11727 | + * This program is distributed in the hope that it will be useful, | |
11728 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11729 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11730 | + * GNU General Public License for more details. | |
11731 | + * | |
11732 | + * You should have received a copy of the GNU General Public License | |
11733 | + * along with this program; if not, write to the Free Software | |
11734 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
11735 | + */ | |
dece6358 | 11736 | + |
1308ab2a | 11737 | +/* |
4a4d8108 AM |
11738 | + * file operations for special files. |
11739 | + * while they exist in aufs virtually, | |
11740 | + * their file I/O is handled out of aufs. | |
1308ab2a | 11741 | + */ |
11742 | + | |
4a4d8108 AM |
11743 | +#include <linux/fs_stack.h> |
11744 | +#include "aufs.h" | |
1308ab2a | 11745 | + |
4a4d8108 AM |
11746 | +static ssize_t aufs_aio_read_sp(struct kiocb *kio, const struct iovec *iov, |
11747 | + unsigned long nv, loff_t pos) | |
dece6358 | 11748 | +{ |
4a4d8108 AM |
11749 | + ssize_t err; |
11750 | + aufs_bindex_t bstart; | |
11751 | + unsigned char wbr; | |
11752 | + struct file *file, *h_file; | |
11753 | + struct super_block *sb; | |
1308ab2a | 11754 | + |
4a4d8108 AM |
11755 | + file = kio->ki_filp; |
11756 | + sb = file->f_dentry->d_sb; | |
11757 | + si_read_lock(sb, AuLock_FLUSH); | |
11758 | + fi_read_lock(file); | |
11759 | + bstart = au_fbstart(file); | |
11760 | + h_file = au_hf_top(file); | |
11761 | + fi_read_unlock(file); | |
11762 | + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm); | |
11763 | + si_read_unlock(sb); | |
11764 | + | |
11765 | + /* do not change the file in kio */ | |
11766 | + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_read); | |
11767 | + err = h_file->f_op->aio_read(kio, iov, nv, pos); | |
11768 | + if (err > 0 && wbr) | |
11769 | + file_accessed(h_file); | |
11770 | + | |
11771 | + return err; | |
11772 | +} | |
11773 | + | |
11774 | +static ssize_t aufs_aio_write_sp(struct kiocb *kio, const struct iovec *iov, | |
11775 | + unsigned long nv, loff_t pos) | |
11776 | +{ | |
11777 | + ssize_t err; | |
11778 | + aufs_bindex_t bstart; | |
11779 | + unsigned char wbr; | |
11780 | + struct super_block *sb; | |
11781 | + struct file *file, *h_file; | |
11782 | + | |
11783 | + file = kio->ki_filp; | |
11784 | + sb = file->f_dentry->d_sb; | |
11785 | + si_read_lock(sb, AuLock_FLUSH); | |
11786 | + fi_read_lock(file); | |
11787 | + bstart = au_fbstart(file); | |
11788 | + h_file = au_hf_top(file); | |
11789 | + fi_read_unlock(file); | |
11790 | + wbr = !!au_br_writable(au_sbr(sb, bstart)->br_perm); | |
11791 | + si_read_unlock(sb); | |
11792 | + | |
11793 | + /* do not change the file in kio */ | |
11794 | + AuDebugOn(!h_file->f_op || !h_file->f_op->aio_write); | |
11795 | + err = h_file->f_op->aio_write(kio, iov, nv, pos); | |
11796 | + if (err > 0 && wbr) | |
11797 | + file_update_time(h_file); | |
11798 | + | |
11799 | + return err; | |
11800 | +} | |
11801 | + | |
11802 | +/* ---------------------------------------------------------------------- */ | |
11803 | + | |
11804 | +static int aufs_release_sp(struct inode *inode, struct file *file) | |
11805 | +{ | |
11806 | + int err; | |
11807 | + struct file *h_file; | |
11808 | + | |
11809 | + fi_read_lock(file); | |
11810 | + h_file = au_hf_top(file); | |
11811 | + fi_read_unlock(file); | |
11812 | + /* close this fifo in aufs */ | |
11813 | + err = h_file->f_op->release(inode, file); /* ignore */ | |
11814 | + aufs_release_nondir(inode, file); /* ignore */ | |
11815 | + return err; | |
11816 | +} | |
11817 | + | |
11818 | +/* ---------------------------------------------------------------------- */ | |
11819 | + | |
11820 | +/* currently, support only FIFO */ | |
4f0767ce JR |
11821 | +enum { |
11822 | + AuSp_FIFO, AuSp_FIFO_R, AuSp_FIFO_W, AuSp_FIFO_RW, | |
11823 | + /* AuSp_SOCK, AuSp_CHR, AuSp_BLK, */ | |
11824 | + AuSp_Last | |
11825 | +}; | |
4a4d8108 AM |
11826 | +static int aufs_open_sp(struct inode *inode, struct file *file); |
11827 | +static struct au_sp_fop { | |
11828 | + int done; | |
11829 | + struct file_operations fop; /* not 'const' */ | |
11830 | + spinlock_t spin; | |
11831 | +} au_sp_fop[AuSp_Last] = { | |
11832 | + [AuSp_FIFO] = { | |
11833 | + .fop = { | |
11834 | + .owner = THIS_MODULE, | |
11835 | + .open = aufs_open_sp | |
11836 | + } | |
11837 | + } | |
11838 | +}; | |
11839 | + | |
11840 | +static void au_init_fop_sp(struct file *file) | |
11841 | +{ | |
11842 | + struct au_sp_fop *p; | |
11843 | + int i; | |
11844 | + struct file *h_file; | |
11845 | + | |
11846 | + p = au_sp_fop; | |
11847 | + if (unlikely(!p->done)) { | |
11848 | + /* initialize first time only */ | |
11849 | + static DEFINE_SPINLOCK(spin); | |
11850 | + | |
11851 | + spin_lock(&spin); | |
11852 | + if (!p->done) { | |
11853 | + BUILD_BUG_ON(sizeof(au_sp_fop)/sizeof(*au_sp_fop) | |
11854 | + != AuSp_Last); | |
11855 | + for (i = 0; i < AuSp_Last; i++) | |
11856 | + spin_lock_init(&p[i].spin); | |
11857 | + p->done = 1; | |
11858 | + } | |
11859 | + spin_unlock(&spin); | |
11860 | + } | |
11861 | + | |
11862 | + switch (file->f_mode & (FMODE_READ | FMODE_WRITE)) { | |
11863 | + case FMODE_READ: | |
11864 | + i = AuSp_FIFO_R; | |
11865 | + break; | |
11866 | + case FMODE_WRITE: | |
11867 | + i = AuSp_FIFO_W; | |
11868 | + break; | |
11869 | + case FMODE_READ | FMODE_WRITE: | |
11870 | + i = AuSp_FIFO_RW; | |
11871 | + break; | |
11872 | + default: | |
11873 | + BUG(); | |
11874 | + } | |
11875 | + | |
11876 | + p += i; | |
11877 | + if (unlikely(!p->done)) { | |
11878 | + /* initialize first time only */ | |
11879 | + h_file = au_hf_top(file); | |
11880 | + spin_lock(&p->spin); | |
11881 | + if (!p->done) { | |
11882 | + p->fop = *h_file->f_op; | |
11883 | + p->fop.owner = THIS_MODULE; | |
11884 | + if (p->fop.aio_read) | |
11885 | + p->fop.aio_read = aufs_aio_read_sp; | |
11886 | + if (p->fop.aio_write) | |
11887 | + p->fop.aio_write = aufs_aio_write_sp; | |
11888 | + p->fop.release = aufs_release_sp; | |
11889 | + p->done = 1; | |
11890 | + } | |
11891 | + spin_unlock(&p->spin); | |
11892 | + } | |
11893 | + file->f_op = &p->fop; | |
11894 | +} | |
11895 | + | |
11896 | +static int au_cpup_sp(struct dentry *dentry) | |
11897 | +{ | |
11898 | + int err; | |
11899 | + aufs_bindex_t bcpup; | |
11900 | + struct au_pin pin; | |
11901 | + struct au_wr_dir_args wr_dir_args = { | |
11902 | + .force_btgt = -1, | |
11903 | + .flags = 0 | |
11904 | + }; | |
11905 | + | |
11906 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
11907 | + | |
11908 | + di_read_unlock(dentry, AuLock_IR); | |
11909 | + di_write_lock_child(dentry); | |
11910 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); | |
11911 | + if (unlikely(err < 0)) | |
11912 | + goto out; | |
11913 | + bcpup = err; | |
11914 | + err = 0; | |
11915 | + if (bcpup == au_dbstart(dentry)) | |
11916 | + goto out; /* success */ | |
11917 | + | |
11918 | + err = au_pin(&pin, dentry, bcpup, au_opt_udba(dentry->d_sb), | |
11919 | + AuPin_MNT_WRITE); | |
11920 | + if (!err) { | |
11921 | + err = au_sio_cpup_simple(dentry, bcpup, -1, AuCpup_DTIME); | |
11922 | + au_unpin(&pin); | |
11923 | + } | |
11924 | + | |
4f0767ce | 11925 | +out: |
4a4d8108 AM |
11926 | + di_downgrade_lock(dentry, AuLock_IR); |
11927 | + return err; | |
11928 | +} | |
11929 | + | |
11930 | +static int au_do_open_sp(struct file *file, int flags) | |
11931 | +{ | |
11932 | + int err; | |
11933 | + struct dentry *dentry; | |
11934 | + struct super_block *sb; | |
11935 | + struct file *h_file; | |
11936 | + struct inode *h_inode; | |
11937 | + | |
11938 | + dentry = file->f_dentry; | |
11939 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
11940 | + | |
11941 | + /* | |
11942 | + * try copying-up. | |
11943 | + * operate on the ro branch is not an error. | |
11944 | + */ | |
11945 | + au_cpup_sp(dentry); /* ignore */ | |
11946 | + | |
11947 | + /* prepare h_file */ | |
11948 | + err = au_do_open_nondir(file, vfsub_file_flags(file)); | |
11949 | + if (unlikely(err)) | |
11950 | + goto out; | |
11951 | + | |
11952 | + sb = dentry->d_sb; | |
11953 | + h_file = au_hf_top(file); | |
11954 | + h_inode = h_file->f_dentry->d_inode; | |
11955 | + di_read_unlock(dentry, AuLock_IR); | |
11956 | + fi_write_unlock(file); | |
11957 | + si_read_unlock(sb); | |
11958 | + /* open this fifo in aufs */ | |
11959 | + err = h_inode->i_fop->open(file->f_dentry->d_inode, file); | |
11960 | + si_noflush_read_lock(sb); | |
11961 | + fi_write_lock(file); | |
11962 | + di_read_lock_child(dentry, AuLock_IR); | |
11963 | + if (!err) | |
11964 | + au_init_fop_sp(file); | |
4a4d8108 | 11965 | + |
4f0767ce | 11966 | +out: |
4a4d8108 AM |
11967 | + return err; |
11968 | +} | |
11969 | + | |
11970 | +static int aufs_open_sp(struct inode *inode, struct file *file) | |
11971 | +{ | |
11972 | + int err; | |
11973 | + struct super_block *sb; | |
11974 | + | |
11975 | + sb = file->f_dentry->d_sb; | |
11976 | + si_read_lock(sb, AuLock_FLUSH); | |
11977 | + err = au_do_open(file, au_do_open_sp, /*fidir*/NULL); | |
11978 | + si_read_unlock(sb); | |
11979 | + return err; | |
11980 | +} | |
11981 | + | |
11982 | +/* ---------------------------------------------------------------------- */ | |
11983 | + | |
11984 | +void au_init_special_fop(struct inode *inode, umode_t mode, dev_t rdev) | |
11985 | +{ | |
11986 | + init_special_inode(inode, mode, rdev); | |
11987 | + | |
11988 | + switch (mode & S_IFMT) { | |
11989 | + case S_IFIFO: | |
11990 | + inode->i_fop = &au_sp_fop[AuSp_FIFO].fop; | |
11991 | + /*FALLTHROUGH*/ | |
11992 | + case S_IFCHR: | |
11993 | + case S_IFBLK: | |
11994 | + case S_IFSOCK: | |
11995 | + break; | |
11996 | + default: | |
11997 | + AuDebugOn(1); | |
11998 | + } | |
11999 | +} | |
12000 | + | |
12001 | +int au_special_file(umode_t mode) | |
12002 | +{ | |
12003 | + int ret; | |
12004 | + | |
12005 | + ret = 0; | |
12006 | + switch (mode & S_IFMT) { | |
12007 | + case S_IFIFO: | |
12008 | +#if 0 | |
12009 | + case S_IFCHR: | |
12010 | + case S_IFBLK: | |
12011 | + case S_IFSOCK: | |
12012 | +#endif | |
12013 | + ret = 1; | |
12014 | + } | |
12015 | + | |
12016 | + return ret; | |
12017 | +} | |
7f207e10 AM |
12018 | diff -urN /usr/share/empty/fs/aufs/fstype.h linux/fs/aufs/fstype.h |
12019 | --- /usr/share/empty/fs/aufs/fstype.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 12020 | +++ linux/fs/aufs/fstype.h 2011-08-24 13:30:24.731313534 +0200 |
4a4d8108 AM |
12021 | @@ -0,0 +1,497 @@ |
12022 | +/* | |
027c5e7a | 12023 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
12024 | + * |
12025 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12026 | + * it under the terms of the GNU General Public License as published by | |
12027 | + * the Free Software Foundation; either version 2 of the License, or | |
12028 | + * (at your option) any later version. | |
12029 | + * | |
12030 | + * This program is distributed in the hope that it will be useful, | |
12031 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12032 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12033 | + * GNU General Public License for more details. | |
12034 | + * | |
12035 | + * You should have received a copy of the GNU General Public License | |
12036 | + * along with this program; if not, write to the Free Software | |
12037 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12038 | + */ | |
12039 | + | |
12040 | +/* | |
12041 | + * judging filesystem type | |
12042 | + */ | |
12043 | + | |
12044 | +#ifndef __AUFS_FSTYPE_H__ | |
12045 | +#define __AUFS_FSTYPE_H__ | |
12046 | + | |
12047 | +#ifdef __KERNEL__ | |
12048 | + | |
12049 | +#include <linux/fs.h> | |
12050 | +#include <linux/magic.h> | |
12051 | +#include <linux/romfs_fs.h> | |
12052 | +#include <linux/aufs_type.h> | |
12053 | + | |
12054 | +static inline int au_test_aufs(struct super_block *sb) | |
12055 | +{ | |
12056 | + return sb->s_magic == AUFS_SUPER_MAGIC; | |
12057 | +} | |
12058 | + | |
12059 | +static inline const char *au_sbtype(struct super_block *sb) | |
12060 | +{ | |
12061 | + return sb->s_type->name; | |
12062 | +} | |
1308ab2a | 12063 | + |
12064 | +static inline int au_test_iso9660(struct super_block *sb __maybe_unused) | |
12065 | +{ | |
12066 | +#if defined(CONFIG_ROMFS_FS) || defined(CONFIG_ROMFS_FS_MODULE) | |
12067 | + return sb->s_magic == ROMFS_MAGIC; | |
dece6358 AM |
12068 | +#else |
12069 | + return 0; | |
12070 | +#endif | |
12071 | +} | |
12072 | + | |
1308ab2a | 12073 | +static inline int au_test_romfs(struct super_block *sb __maybe_unused) |
dece6358 | 12074 | +{ |
1308ab2a | 12075 | +#if defined(CONFIG_ISO9660_FS) || defined(CONFIG_ISO9660_FS_MODULE) |
12076 | + return sb->s_magic == ISOFS_SUPER_MAGIC; | |
dece6358 AM |
12077 | +#else |
12078 | + return 0; | |
12079 | +#endif | |
12080 | +} | |
12081 | + | |
1308ab2a | 12082 | +static inline int au_test_cramfs(struct super_block *sb __maybe_unused) |
dece6358 | 12083 | +{ |
1308ab2a | 12084 | +#if defined(CONFIG_CRAMFS) || defined(CONFIG_CRAMFS_MODULE) |
12085 | + return sb->s_magic == CRAMFS_MAGIC; | |
12086 | +#endif | |
12087 | + return 0; | |
12088 | +} | |
12089 | + | |
12090 | +static inline int au_test_nfs(struct super_block *sb __maybe_unused) | |
12091 | +{ | |
12092 | +#if defined(CONFIG_NFS_FS) || defined(CONFIG_NFS_FS_MODULE) | |
12093 | + return sb->s_magic == NFS_SUPER_MAGIC; | |
dece6358 AM |
12094 | +#else |
12095 | + return 0; | |
12096 | +#endif | |
12097 | +} | |
12098 | + | |
1308ab2a | 12099 | +static inline int au_test_fuse(struct super_block *sb __maybe_unused) |
dece6358 | 12100 | +{ |
1308ab2a | 12101 | +#if defined(CONFIG_FUSE_FS) || defined(CONFIG_FUSE_FS_MODULE) |
12102 | + return sb->s_magic == FUSE_SUPER_MAGIC; | |
dece6358 AM |
12103 | +#else |
12104 | + return 0; | |
12105 | +#endif | |
12106 | +} | |
12107 | + | |
1308ab2a | 12108 | +static inline int au_test_xfs(struct super_block *sb __maybe_unused) |
dece6358 | 12109 | +{ |
1308ab2a | 12110 | +#if defined(CONFIG_XFS_FS) || defined(CONFIG_XFS_FS_MODULE) |
12111 | + return sb->s_magic == XFS_SB_MAGIC; | |
dece6358 AM |
12112 | +#else |
12113 | + return 0; | |
12114 | +#endif | |
12115 | +} | |
12116 | + | |
1308ab2a | 12117 | +static inline int au_test_tmpfs(struct super_block *sb __maybe_unused) |
dece6358 | 12118 | +{ |
1308ab2a | 12119 | +#ifdef CONFIG_TMPFS |
12120 | + return sb->s_magic == TMPFS_MAGIC; | |
12121 | +#else | |
12122 | + return 0; | |
dece6358 | 12123 | +#endif |
dece6358 AM |
12124 | +} |
12125 | + | |
1308ab2a | 12126 | +static inline int au_test_ecryptfs(struct super_block *sb __maybe_unused) |
1facf9fc | 12127 | +{ |
1308ab2a | 12128 | +#if defined(CONFIG_ECRYPT_FS) || defined(CONFIG_ECRYPT_FS_MODULE) |
12129 | + return !strcmp(au_sbtype(sb), "ecryptfs"); | |
12130 | +#else | |
12131 | + return 0; | |
12132 | +#endif | |
1facf9fc | 12133 | +} |
12134 | + | |
1308ab2a | 12135 | +static inline int au_test_smbfs(struct super_block *sb __maybe_unused) |
1facf9fc | 12136 | +{ |
1308ab2a | 12137 | +#if defined(CONFIG_SMB_FS) || defined(CONFIG_SMB_FS_MODULE) |
12138 | + return sb->s_magic == SMB_SUPER_MAGIC; | |
12139 | +#else | |
12140 | + return 0; | |
1facf9fc | 12141 | +#endif |
1facf9fc | 12142 | +} |
12143 | + | |
1308ab2a | 12144 | +static inline int au_test_ocfs2(struct super_block *sb __maybe_unused) |
1facf9fc | 12145 | +{ |
1308ab2a | 12146 | +#if defined(CONFIG_OCFS2_FS) || defined(CONFIG_OCFS2_FS_MODULE) |
12147 | + return sb->s_magic == OCFS2_SUPER_MAGIC; | |
12148 | +#else | |
12149 | + return 0; | |
12150 | +#endif | |
1facf9fc | 12151 | +} |
12152 | + | |
1308ab2a | 12153 | +static inline int au_test_ocfs2_dlmfs(struct super_block *sb __maybe_unused) |
1facf9fc | 12154 | +{ |
1308ab2a | 12155 | +#if defined(CONFIG_OCFS2_FS_O2CB) || defined(CONFIG_OCFS2_FS_O2CB_MODULE) |
12156 | + return sb->s_magic == DLMFS_MAGIC; | |
12157 | +#else | |
12158 | + return 0; | |
12159 | +#endif | |
1facf9fc | 12160 | +} |
12161 | + | |
1308ab2a | 12162 | +static inline int au_test_coda(struct super_block *sb __maybe_unused) |
1facf9fc | 12163 | +{ |
1308ab2a | 12164 | +#if defined(CONFIG_CODA_FS) || defined(CONFIG_CODA_FS_MODULE) |
12165 | + return sb->s_magic == CODA_SUPER_MAGIC; | |
12166 | +#else | |
12167 | + return 0; | |
12168 | +#endif | |
12169 | +} | |
12170 | + | |
12171 | +static inline int au_test_v9fs(struct super_block *sb __maybe_unused) | |
12172 | +{ | |
12173 | +#if defined(CONFIG_9P_FS) || defined(CONFIG_9P_FS_MODULE) | |
12174 | + return sb->s_magic == V9FS_MAGIC; | |
12175 | +#else | |
12176 | + return 0; | |
12177 | +#endif | |
12178 | +} | |
12179 | + | |
12180 | +static inline int au_test_ext4(struct super_block *sb __maybe_unused) | |
12181 | +{ | |
12182 | +#if defined(CONFIG_EXT4DEV_FS) || defined(CONFIG_EXT4DEV_FS_MODULE) | |
12183 | + return sb->s_magic == EXT4_SUPER_MAGIC; | |
12184 | +#else | |
12185 | + return 0; | |
12186 | +#endif | |
12187 | +} | |
12188 | + | |
12189 | +static inline int au_test_sysv(struct super_block *sb __maybe_unused) | |
12190 | +{ | |
12191 | +#if defined(CONFIG_SYSV_FS) || defined(CONFIG_SYSV_FS_MODULE) | |
12192 | + return !strcmp(au_sbtype(sb), "sysv"); | |
12193 | +#else | |
12194 | + return 0; | |
12195 | +#endif | |
12196 | +} | |
12197 | + | |
12198 | +static inline int au_test_ramfs(struct super_block *sb) | |
12199 | +{ | |
12200 | + return sb->s_magic == RAMFS_MAGIC; | |
12201 | +} | |
12202 | + | |
12203 | +static inline int au_test_ubifs(struct super_block *sb __maybe_unused) | |
12204 | +{ | |
12205 | +#if defined(CONFIG_UBIFS_FS) || defined(CONFIG_UBIFS_FS_MODULE) | |
12206 | + return sb->s_magic == UBIFS_SUPER_MAGIC; | |
12207 | +#else | |
12208 | + return 0; | |
12209 | +#endif | |
12210 | +} | |
12211 | + | |
12212 | +static inline int au_test_procfs(struct super_block *sb __maybe_unused) | |
12213 | +{ | |
12214 | +#ifdef CONFIG_PROC_FS | |
12215 | + return sb->s_magic == PROC_SUPER_MAGIC; | |
12216 | +#else | |
12217 | + return 0; | |
12218 | +#endif | |
12219 | +} | |
12220 | + | |
12221 | +static inline int au_test_sysfs(struct super_block *sb __maybe_unused) | |
12222 | +{ | |
12223 | +#ifdef CONFIG_SYSFS | |
12224 | + return sb->s_magic == SYSFS_MAGIC; | |
12225 | +#else | |
12226 | + return 0; | |
12227 | +#endif | |
12228 | +} | |
12229 | + | |
12230 | +static inline int au_test_configfs(struct super_block *sb __maybe_unused) | |
12231 | +{ | |
12232 | +#if defined(CONFIG_CONFIGFS_FS) || defined(CONFIG_CONFIGFS_FS_MODULE) | |
12233 | + return sb->s_magic == CONFIGFS_MAGIC; | |
12234 | +#else | |
12235 | + return 0; | |
12236 | +#endif | |
12237 | +} | |
12238 | + | |
12239 | +static inline int au_test_minix(struct super_block *sb __maybe_unused) | |
12240 | +{ | |
12241 | +#if defined(CONFIG_MINIX_FS) || defined(CONFIG_MINIX_FS_MODULE) | |
12242 | + return sb->s_magic == MINIX3_SUPER_MAGIC | |
12243 | + || sb->s_magic == MINIX2_SUPER_MAGIC | |
12244 | + || sb->s_magic == MINIX2_SUPER_MAGIC2 | |
12245 | + || sb->s_magic == MINIX_SUPER_MAGIC | |
12246 | + || sb->s_magic == MINIX_SUPER_MAGIC2; | |
12247 | +#else | |
12248 | + return 0; | |
12249 | +#endif | |
12250 | +} | |
12251 | + | |
12252 | +static inline int au_test_cifs(struct super_block *sb __maybe_unused) | |
12253 | +{ | |
12254 | +#if defined(CONFIG_CIFS_FS) || defined(CONFIGCIFS_FS_MODULE) | |
12255 | + return sb->s_magic == CIFS_MAGIC_NUMBER; | |
12256 | +#else | |
12257 | + return 0; | |
12258 | +#endif | |
12259 | +} | |
12260 | + | |
12261 | +static inline int au_test_fat(struct super_block *sb __maybe_unused) | |
12262 | +{ | |
12263 | +#if defined(CONFIG_FAT_FS) || defined(CONFIG_FAT_FS_MODULE) | |
12264 | + return sb->s_magic == MSDOS_SUPER_MAGIC; | |
12265 | +#else | |
12266 | + return 0; | |
12267 | +#endif | |
12268 | +} | |
12269 | + | |
12270 | +static inline int au_test_msdos(struct super_block *sb) | |
12271 | +{ | |
12272 | + return au_test_fat(sb); | |
12273 | +} | |
12274 | + | |
12275 | +static inline int au_test_vfat(struct super_block *sb) | |
12276 | +{ | |
12277 | + return au_test_fat(sb); | |
12278 | +} | |
12279 | + | |
12280 | +static inline int au_test_securityfs(struct super_block *sb __maybe_unused) | |
12281 | +{ | |
12282 | +#ifdef CONFIG_SECURITYFS | |
12283 | + return sb->s_magic == SECURITYFS_MAGIC; | |
12284 | +#else | |
12285 | + return 0; | |
12286 | +#endif | |
12287 | +} | |
12288 | + | |
12289 | +static inline int au_test_squashfs(struct super_block *sb __maybe_unused) | |
12290 | +{ | |
12291 | +#if defined(CONFIG_SQUASHFS) || defined(CONFIG_SQUASHFS_MODULE) | |
12292 | + return sb->s_magic == SQUASHFS_MAGIC; | |
12293 | +#else | |
12294 | + return 0; | |
12295 | +#endif | |
12296 | +} | |
12297 | + | |
12298 | +static inline int au_test_btrfs(struct super_block *sb __maybe_unused) | |
12299 | +{ | |
12300 | +#if defined(CONFIG_BTRFS_FS) || defined(CONFIG_BTRFS_FS_MODULE) | |
12301 | + return sb->s_magic == BTRFS_SUPER_MAGIC; | |
12302 | +#else | |
12303 | + return 0; | |
12304 | +#endif | |
12305 | +} | |
12306 | + | |
12307 | +static inline int au_test_xenfs(struct super_block *sb __maybe_unused) | |
12308 | +{ | |
12309 | +#if defined(CONFIG_XENFS) || defined(CONFIG_XENFS_MODULE) | |
12310 | + return sb->s_magic == XENFS_SUPER_MAGIC; | |
12311 | +#else | |
12312 | + return 0; | |
12313 | +#endif | |
12314 | +} | |
12315 | + | |
12316 | +static inline int au_test_debugfs(struct super_block *sb __maybe_unused) | |
12317 | +{ | |
12318 | +#ifdef CONFIG_DEBUG_FS | |
12319 | + return sb->s_magic == DEBUGFS_MAGIC; | |
12320 | +#else | |
12321 | + return 0; | |
12322 | +#endif | |
12323 | +} | |
12324 | + | |
12325 | +static inline int au_test_nilfs(struct super_block *sb __maybe_unused) | |
12326 | +{ | |
12327 | +#if defined(CONFIG_NILFS) || defined(CONFIG_NILFS_MODULE) | |
12328 | + return sb->s_magic == NILFS_SUPER_MAGIC; | |
12329 | +#else | |
12330 | + return 0; | |
12331 | +#endif | |
12332 | +} | |
12333 | + | |
4a4d8108 AM |
12334 | +static inline int au_test_hfsplus(struct super_block *sb __maybe_unused) |
12335 | +{ | |
12336 | +#if defined(CONFIG_HFSPLUS_FS) || defined(CONFIG_HFSPLUS_FS_MODULE) | |
12337 | + return sb->s_magic == HFSPLUS_SUPER_MAGIC; | |
12338 | +#else | |
12339 | + return 0; | |
12340 | +#endif | |
12341 | +} | |
12342 | + | |
1308ab2a | 12343 | +/* ---------------------------------------------------------------------- */ |
12344 | +/* | |
12345 | + * they can't be an aufs branch. | |
12346 | + */ | |
12347 | +static inline int au_test_fs_unsuppoted(struct super_block *sb) | |
12348 | +{ | |
12349 | + return | |
12350 | +#ifndef CONFIG_AUFS_BR_RAMFS | |
12351 | + au_test_ramfs(sb) || | |
12352 | +#endif | |
12353 | + au_test_procfs(sb) | |
12354 | + || au_test_sysfs(sb) | |
12355 | + || au_test_configfs(sb) | |
12356 | + || au_test_debugfs(sb) | |
12357 | + || au_test_securityfs(sb) | |
12358 | + || au_test_xenfs(sb) | |
12359 | + || au_test_ecryptfs(sb) | |
12360 | + /* || !strcmp(au_sbtype(sb), "unionfs") */ | |
12361 | + || au_test_aufs(sb); /* will be supported in next version */ | |
12362 | +} | |
12363 | + | |
12364 | +/* | |
12365 | + * If the filesystem supports NFS-export, then it has to support NULL as | |
12366 | + * a nameidata parameter for ->create(), ->lookup() and ->d_revalidate(). | |
12367 | + * We can apply this principle when we handle a lower filesystem. | |
12368 | + */ | |
12369 | +static inline int au_test_fs_null_nd(struct super_block *sb) | |
12370 | +{ | |
12371 | + return !!sb->s_export_op; | |
12372 | +} | |
12373 | + | |
12374 | +static inline int au_test_fs_remote(struct super_block *sb) | |
12375 | +{ | |
12376 | + return !au_test_tmpfs(sb) | |
12377 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
12378 | + && !au_test_ramfs(sb) | |
12379 | +#endif | |
12380 | + && !(sb->s_type->fs_flags & FS_REQUIRES_DEV); | |
12381 | +} | |
12382 | + | |
12383 | +/* ---------------------------------------------------------------------- */ | |
12384 | + | |
12385 | +/* | |
12386 | + * Note: these functions (below) are created after reading ->getattr() in all | |
12387 | + * filesystems under linux/fs. it means we have to do so in every update... | |
12388 | + */ | |
12389 | + | |
12390 | +/* | |
12391 | + * some filesystems require getattr to refresh the inode attributes before | |
12392 | + * referencing. | |
12393 | + * in most cases, we can rely on the inode attribute in NFS (or every remote fs) | |
12394 | + * and leave the work for d_revalidate() | |
12395 | + */ | |
12396 | +static inline int au_test_fs_refresh_iattr(struct super_block *sb) | |
12397 | +{ | |
12398 | + return au_test_nfs(sb) | |
12399 | + || au_test_fuse(sb) | |
12400 | + /* || au_test_smbfs(sb) */ /* untested */ | |
12401 | + /* || au_test_ocfs2(sb) */ /* untested */ | |
12402 | + /* || au_test_btrfs(sb) */ /* untested */ | |
12403 | + /* || au_test_coda(sb) */ /* untested */ | |
12404 | + /* || au_test_v9fs(sb) */ /* untested */ | |
12405 | + ; | |
12406 | +} | |
12407 | + | |
12408 | +/* | |
12409 | + * filesystems which don't maintain i_size or i_blocks. | |
12410 | + */ | |
12411 | +static inline int au_test_fs_bad_iattr_size(struct super_block *sb) | |
12412 | +{ | |
12413 | + return au_test_xfs(sb) | |
4a4d8108 AM |
12414 | + || au_test_btrfs(sb) |
12415 | + || au_test_ubifs(sb) | |
12416 | + || au_test_hfsplus(sb) /* maintained, but incorrect */ | |
1308ab2a | 12417 | + /* || au_test_ext4(sb) */ /* untested */ |
12418 | + /* || au_test_ocfs2(sb) */ /* untested */ | |
12419 | + /* || au_test_ocfs2_dlmfs(sb) */ /* untested */ | |
12420 | + /* || au_test_sysv(sb) */ /* untested */ | |
1308ab2a | 12421 | + /* || au_test_minix(sb) */ /* untested */ |
12422 | + ; | |
12423 | +} | |
12424 | + | |
12425 | +/* | |
12426 | + * filesystems which don't store the correct value in some of their inode | |
12427 | + * attributes. | |
12428 | + */ | |
12429 | +static inline int au_test_fs_bad_iattr(struct super_block *sb) | |
12430 | +{ | |
12431 | + return au_test_fs_bad_iattr_size(sb) | |
12432 | + /* || au_test_cifs(sb) */ /* untested */ | |
12433 | + || au_test_fat(sb) | |
12434 | + || au_test_msdos(sb) | |
12435 | + || au_test_vfat(sb); | |
1facf9fc | 12436 | +} |
12437 | + | |
12438 | +/* they don't check i_nlink in link(2) */ | |
12439 | +static inline int au_test_fs_no_limit_nlink(struct super_block *sb) | |
12440 | +{ | |
12441 | + return au_test_tmpfs(sb) | |
12442 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
12443 | + || au_test_ramfs(sb) | |
12444 | +#endif | |
4a4d8108 AM |
12445 | + || au_test_ubifs(sb) |
12446 | + || au_test_btrfs(sb) | |
12447 | + || au_test_hfsplus(sb); | |
1facf9fc | 12448 | +} |
12449 | + | |
12450 | +/* | |
12451 | + * filesystems which sets S_NOATIME and S_NOCMTIME. | |
12452 | + */ | |
12453 | +static inline int au_test_fs_notime(struct super_block *sb) | |
12454 | +{ | |
12455 | + return au_test_nfs(sb) | |
12456 | + || au_test_fuse(sb) | |
dece6358 | 12457 | + || au_test_ubifs(sb) |
1facf9fc | 12458 | + /* || au_test_cifs(sb) */ /* untested */ |
1facf9fc | 12459 | + ; |
12460 | +} | |
12461 | + | |
12462 | +/* | |
12463 | + * filesystems which requires replacing i_mapping. | |
12464 | + */ | |
12465 | +static inline int au_test_fs_bad_mapping(struct super_block *sb) | |
12466 | +{ | |
dece6358 AM |
12467 | + return au_test_fuse(sb) |
12468 | + || au_test_ubifs(sb); | |
1facf9fc | 12469 | +} |
12470 | + | |
12471 | +/* temporary support for i#1 in cramfs */ | |
12472 | +static inline int au_test_fs_unique_ino(struct inode *inode) | |
12473 | +{ | |
12474 | + if (au_test_cramfs(inode->i_sb)) | |
12475 | + return inode->i_ino != 1; | |
12476 | + return 1; | |
12477 | +} | |
12478 | + | |
12479 | +/* ---------------------------------------------------------------------- */ | |
12480 | + | |
12481 | +/* | |
12482 | + * the filesystem where the xino files placed must support i/o after unlink and | |
12483 | + * maintain i_size and i_blocks. | |
12484 | + */ | |
12485 | +static inline int au_test_fs_bad_xino(struct super_block *sb) | |
12486 | +{ | |
12487 | + return au_test_fs_remote(sb) | |
12488 | + || au_test_fs_bad_iattr_size(sb) | |
12489 | +#ifdef CONFIG_AUFS_BR_RAMFS | |
12490 | + || !(au_test_ramfs(sb) || au_test_fs_null_nd(sb)) | |
12491 | +#else | |
12492 | + || !au_test_fs_null_nd(sb) /* to keep xino code simple */ | |
12493 | +#endif | |
12494 | + /* don't want unnecessary work for xino */ | |
12495 | + || au_test_aufs(sb) | |
1308ab2a | 12496 | + || au_test_ecryptfs(sb) |
12497 | + || au_test_nilfs(sb); | |
1facf9fc | 12498 | +} |
12499 | + | |
12500 | +static inline int au_test_fs_trunc_xino(struct super_block *sb) | |
12501 | +{ | |
12502 | + return au_test_tmpfs(sb) | |
12503 | + || au_test_ramfs(sb); | |
12504 | +} | |
12505 | + | |
12506 | +/* | |
12507 | + * test if the @sb is real-readonly. | |
12508 | + */ | |
12509 | +static inline int au_test_fs_rr(struct super_block *sb) | |
12510 | +{ | |
12511 | + return au_test_squashfs(sb) | |
12512 | + || au_test_iso9660(sb) | |
12513 | + || au_test_cramfs(sb) | |
12514 | + || au_test_romfs(sb); | |
12515 | +} | |
12516 | + | |
12517 | +#endif /* __KERNEL__ */ | |
12518 | +#endif /* __AUFS_FSTYPE_H__ */ | |
7f207e10 AM |
12519 | diff -urN /usr/share/empty/fs/aufs/hfsnotify.c linux/fs/aufs/hfsnotify.c |
12520 | --- /usr/share/empty/fs/aufs/hfsnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 12521 | +++ linux/fs/aufs/hfsnotify.c 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 12522 | @@ -0,0 +1,247 @@ |
1facf9fc | 12523 | +/* |
027c5e7a | 12524 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 12525 | + * |
12526 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12527 | + * it under the terms of the GNU General Public License as published by | |
12528 | + * the Free Software Foundation; either version 2 of the License, or | |
12529 | + * (at your option) any later version. | |
dece6358 AM |
12530 | + * |
12531 | + * This program is distributed in the hope that it will be useful, | |
12532 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12533 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12534 | + * GNU General Public License for more details. | |
12535 | + * | |
12536 | + * You should have received a copy of the GNU General Public License | |
12537 | + * along with this program; if not, write to the Free Software | |
12538 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 12539 | + */ |
12540 | + | |
12541 | +/* | |
4a4d8108 | 12542 | + * fsnotify for the lower directories |
1facf9fc | 12543 | + */ |
12544 | + | |
12545 | +#include "aufs.h" | |
12546 | + | |
4a4d8108 AM |
12547 | +/* FS_IN_IGNORED is unnecessary */ |
12548 | +static const __u32 AuHfsnMask = (FS_MOVED_TO | FS_MOVED_FROM | FS_DELETE | |
12549 | + | FS_CREATE | FS_EVENT_ON_CHILD); | |
7f207e10 | 12550 | +static DECLARE_WAIT_QUEUE_HEAD(au_hfsn_wq); |
1facf9fc | 12551 | + |
0c5527e5 | 12552 | +static void au_hfsn_free_mark(struct fsnotify_mark *mark) |
1facf9fc | 12553 | +{ |
0c5527e5 AM |
12554 | + struct au_hnotify *hn = container_of(mark, struct au_hnotify, |
12555 | + hn_mark); | |
4a4d8108 | 12556 | + AuDbg("here\n"); |
7f207e10 AM |
12557 | + hn->hn_mark_dead = 1; |
12558 | + smp_mb(); | |
12559 | + wake_up_all(&au_hfsn_wq); | |
4a4d8108 | 12560 | +} |
1facf9fc | 12561 | + |
027c5e7a | 12562 | +static int au_hfsn_alloc(struct au_hinode *hinode) |
4a4d8108 | 12563 | +{ |
027c5e7a AM |
12564 | + struct au_hnotify *hn; |
12565 | + struct super_block *sb; | |
12566 | + struct au_branch *br; | |
0c5527e5 | 12567 | + struct fsnotify_mark *mark; |
027c5e7a | 12568 | + aufs_bindex_t bindex; |
1facf9fc | 12569 | + |
027c5e7a AM |
12570 | + hn = hinode->hi_notify; |
12571 | + sb = hn->hn_aufs_inode->i_sb; | |
12572 | + bindex = au_br_index(sb, hinode->hi_id); | |
12573 | + br = au_sbr(sb, bindex); | |
7f207e10 | 12574 | + hn->hn_mark_dead = 0; |
0c5527e5 AM |
12575 | + mark = &hn->hn_mark; |
12576 | + fsnotify_init_mark(mark, au_hfsn_free_mark); | |
12577 | + mark->mask = AuHfsnMask; | |
7f207e10 AM |
12578 | + /* |
12579 | + * by udba rename or rmdir, aufs assign a new inode to the known | |
12580 | + * h_inode, so specify 1 to allow dups. | |
12581 | + */ | |
027c5e7a AM |
12582 | + return fsnotify_add_mark(mark, br->br_hfsn_group, hinode->hi_inode, |
12583 | + /*mnt*/NULL, /*allow_dups*/1); | |
1facf9fc | 12584 | +} |
12585 | + | |
027c5e7a | 12586 | +static void au_hfsn_free(struct au_hinode *hinode) |
1facf9fc | 12587 | +{ |
027c5e7a | 12588 | + struct au_hnotify *hn; |
0c5527e5 | 12589 | + struct fsnotify_mark *mark; |
953406b4 | 12590 | + |
027c5e7a | 12591 | + hn = hinode->hi_notify; |
0c5527e5 AM |
12592 | + mark = &hn->hn_mark; |
12593 | + fsnotify_destroy_mark(mark); | |
12594 | + fsnotify_put_mark(mark); | |
7f207e10 AM |
12595 | + |
12596 | + /* TODO: bad approach */ | |
12597 | + wait_event(au_hfsn_wq, hn->hn_mark_dead); | |
1facf9fc | 12598 | +} |
12599 | + | |
12600 | +/* ---------------------------------------------------------------------- */ | |
12601 | + | |
4a4d8108 | 12602 | +static void au_hfsn_ctl(struct au_hinode *hinode, int do_set) |
1facf9fc | 12603 | +{ |
0c5527e5 | 12604 | + struct fsnotify_mark *mark; |
1facf9fc | 12605 | + |
0c5527e5 AM |
12606 | + mark = &hinode->hi_notify->hn_mark; |
12607 | + spin_lock(&mark->lock); | |
1facf9fc | 12608 | + if (do_set) { |
0c5527e5 AM |
12609 | + AuDebugOn(mark->mask & AuHfsnMask); |
12610 | + mark->mask |= AuHfsnMask; | |
1facf9fc | 12611 | + } else { |
0c5527e5 AM |
12612 | + AuDebugOn(!(mark->mask & AuHfsnMask)); |
12613 | + mark->mask &= ~AuHfsnMask; | |
1facf9fc | 12614 | + } |
0c5527e5 | 12615 | + spin_unlock(&mark->lock); |
4a4d8108 | 12616 | + /* fsnotify_recalc_inode_mask(hinode->hi_inode); */ |
1facf9fc | 12617 | +} |
12618 | + | |
4a4d8108 | 12619 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 12620 | + |
4a4d8108 AM |
12621 | +/* #define AuDbgHnotify */ |
12622 | +#ifdef AuDbgHnotify | |
12623 | +static char *au_hfsn_name(u32 mask) | |
12624 | +{ | |
12625 | +#ifdef CONFIG_AUFS_DEBUG | |
12626 | +#define test_ret(flag) if (mask & flag) \ | |
12627 | + return #flag; | |
12628 | + test_ret(FS_ACCESS); | |
12629 | + test_ret(FS_MODIFY); | |
12630 | + test_ret(FS_ATTRIB); | |
12631 | + test_ret(FS_CLOSE_WRITE); | |
12632 | + test_ret(FS_CLOSE_NOWRITE); | |
12633 | + test_ret(FS_OPEN); | |
12634 | + test_ret(FS_MOVED_FROM); | |
12635 | + test_ret(FS_MOVED_TO); | |
12636 | + test_ret(FS_CREATE); | |
12637 | + test_ret(FS_DELETE); | |
12638 | + test_ret(FS_DELETE_SELF); | |
12639 | + test_ret(FS_MOVE_SELF); | |
12640 | + test_ret(FS_UNMOUNT); | |
12641 | + test_ret(FS_Q_OVERFLOW); | |
12642 | + test_ret(FS_IN_IGNORED); | |
12643 | + test_ret(FS_IN_ISDIR); | |
12644 | + test_ret(FS_IN_ONESHOT); | |
12645 | + test_ret(FS_EVENT_ON_CHILD); | |
12646 | + return ""; | |
12647 | +#undef test_ret | |
12648 | +#else | |
12649 | + return "??"; | |
12650 | +#endif | |
1facf9fc | 12651 | +} |
4a4d8108 | 12652 | +#endif |
1facf9fc | 12653 | + |
12654 | +/* ---------------------------------------------------------------------- */ | |
12655 | + | |
4a4d8108 | 12656 | +static int au_hfsn_handle_event(struct fsnotify_group *group, |
0c5527e5 AM |
12657 | + struct fsnotify_mark *inode_mark, |
12658 | + struct fsnotify_mark *vfsmount_mark, | |
4a4d8108 | 12659 | + struct fsnotify_event *event) |
1facf9fc | 12660 | +{ |
12661 | + int err; | |
4a4d8108 AM |
12662 | + struct au_hnotify *hnotify; |
12663 | + struct inode *h_dir, *h_inode; | |
12664 | + __u32 mask; | |
4a4d8108 AM |
12665 | + struct qstr h_child_qstr = { |
12666 | + .name = event->file_name, | |
12667 | + .len = event->name_len | |
12668 | + }; | |
12669 | + | |
12670 | + AuDebugOn(event->data_type != FSNOTIFY_EVENT_INODE); | |
1facf9fc | 12671 | + |
12672 | + err = 0; | |
0c5527e5 | 12673 | + /* if FS_UNMOUNT happens, there must be another bug */ |
4a4d8108 AM |
12674 | + mask = event->mask; |
12675 | + AuDebugOn(mask & FS_UNMOUNT); | |
0c5527e5 | 12676 | + if (mask & (FS_IN_IGNORED | FS_UNMOUNT)) |
1facf9fc | 12677 | + goto out; |
1facf9fc | 12678 | + |
4a4d8108 AM |
12679 | + h_dir = event->to_tell; |
12680 | + h_inode = event->inode; | |
12681 | +#ifdef AuDbgHnotify | |
12682 | + au_debug(1); | |
12683 | + if (1 || h_child_qstr.len != sizeof(AUFS_XINO_FNAME) - 1 | |
12684 | + || strncmp(h_child_qstr.name, AUFS_XINO_FNAME, h_child_qstr.len)) { | |
12685 | + AuDbg("i%lu, mask 0x%x %s, hcname %.*s, hi%lu\n", | |
12686 | + h_dir->i_ino, mask, au_hfsn_name(mask), | |
12687 | + AuLNPair(&h_child_qstr), h_inode ? h_inode->i_ino : 0); | |
12688 | + /* WARN_ON(1); */ | |
1facf9fc | 12689 | + } |
4a4d8108 | 12690 | + au_debug(0); |
1facf9fc | 12691 | +#endif |
4a4d8108 | 12692 | + |
0c5527e5 AM |
12693 | + AuDebugOn(!inode_mark); |
12694 | + hnotify = container_of(inode_mark, struct au_hnotify, hn_mark); | |
12695 | + err = au_hnotify(h_dir, hnotify, mask, &h_child_qstr, h_inode); | |
1facf9fc | 12696 | + |
4a4d8108 AM |
12697 | +out: |
12698 | + return err; | |
12699 | +} | |
1facf9fc | 12700 | + |
027c5e7a | 12701 | +/* isn't it waste to ask every registered 'group'? */ |
7f207e10 | 12702 | +/* copied from linux/fs/notify/inotify/inotify_fsnotiry.c */ |
4a4d8108 | 12703 | +/* it should be exported to modules */ |
7f207e10 AM |
12704 | +static bool au_hfsn_should_send_event(struct fsnotify_group *group, |
12705 | + struct inode *h_inode, | |
0c5527e5 AM |
12706 | + struct fsnotify_mark *inode_mark, |
12707 | + struct fsnotify_mark *vfsmount_mark, | |
12708 | + __u32 mask, void *data, int data_type) | |
4a4d8108 | 12709 | +{ |
4a4d8108 | 12710 | + mask = (mask & ~FS_EVENT_ON_CHILD); |
7f207e10 | 12711 | + return inode_mark->mask & mask; |
4a4d8108 AM |
12712 | +} |
12713 | + | |
12714 | +static struct fsnotify_ops au_hfsn_ops = { | |
12715 | + .should_send_event = au_hfsn_should_send_event, | |
12716 | + .handle_event = au_hfsn_handle_event | |
12717 | +}; | |
12718 | + | |
12719 | +/* ---------------------------------------------------------------------- */ | |
12720 | + | |
027c5e7a AM |
12721 | +static void au_hfsn_fin_br(struct au_branch *br) |
12722 | +{ | |
12723 | + if (br->br_hfsn_group) | |
12724 | + fsnotify_put_group(br->br_hfsn_group); | |
12725 | +} | |
12726 | + | |
12727 | +static int au_hfsn_init_br(struct au_branch *br, int perm) | |
12728 | +{ | |
12729 | + br->br_hfsn_group = NULL; | |
12730 | + br->br_hfsn_ops = au_hfsn_ops; | |
12731 | + return 0; | |
12732 | +} | |
12733 | + | |
12734 | +static int au_hfsn_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
4a4d8108 AM |
12735 | +{ |
12736 | + int err; | |
1facf9fc | 12737 | + |
4a4d8108 | 12738 | + err = 0; |
027c5e7a AM |
12739 | + if (udba != AuOpt_UDBA_HNOTIFY |
12740 | + || !au_br_hnotifyable(perm)) { | |
12741 | + au_hfsn_fin_br(br); | |
12742 | + br->br_hfsn_group = NULL; | |
12743 | + goto out; | |
12744 | + } | |
12745 | + | |
12746 | + if (br->br_hfsn_group) | |
12747 | + goto out; | |
12748 | + | |
12749 | + br->br_hfsn_group = fsnotify_alloc_group(&br->br_hfsn_ops); | |
12750 | + if (IS_ERR(br->br_hfsn_group)) { | |
12751 | + err = PTR_ERR(br->br_hfsn_group); | |
0c5527e5 | 12752 | + pr_err("fsnotify_alloc_group() failed, %d\n", err); |
027c5e7a | 12753 | + br->br_hfsn_group = NULL; |
4a4d8108 | 12754 | + } |
1facf9fc | 12755 | + |
027c5e7a | 12756 | +out: |
1facf9fc | 12757 | + AuTraceErr(err); |
12758 | + return err; | |
12759 | +} | |
12760 | + | |
4a4d8108 AM |
12761 | +const struct au_hnotify_op au_hnotify_op = { |
12762 | + .ctl = au_hfsn_ctl, | |
12763 | + .alloc = au_hfsn_alloc, | |
12764 | + .free = au_hfsn_free, | |
1facf9fc | 12765 | + |
027c5e7a AM |
12766 | + .reset_br = au_hfsn_reset_br, |
12767 | + .fin_br = au_hfsn_fin_br, | |
12768 | + .init_br = au_hfsn_init_br | |
4a4d8108 | 12769 | +}; |
7f207e10 AM |
12770 | diff -urN /usr/share/empty/fs/aufs/hfsplus.c linux/fs/aufs/hfsplus.c |
12771 | --- /usr/share/empty/fs/aufs/hfsplus.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 12772 | +++ linux/fs/aufs/hfsplus.c 2011-08-24 13:30:24.731313534 +0200 |
4a4d8108 AM |
12773 | @@ -0,0 +1,58 @@ |
12774 | +/* | |
027c5e7a | 12775 | + * Copyright (C) 2010-2011 Junjiro R. Okajima |
4a4d8108 AM |
12776 | + * |
12777 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12778 | + * it under the terms of the GNU General Public License as published by | |
12779 | + * the Free Software Foundation; either version 2 of the License, or | |
12780 | + * (at your option) any later version. | |
12781 | + * | |
12782 | + * This program is distributed in the hope that it will be useful, | |
12783 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12784 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12785 | + * GNU General Public License for more details. | |
12786 | + * | |
12787 | + * You should have received a copy of the GNU General Public License | |
12788 | + * along with this program; if not, write to the Free Software | |
12789 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12790 | + */ | |
1facf9fc | 12791 | + |
4a4d8108 AM |
12792 | +/* |
12793 | + * special support for filesystems which aqucires an inode mutex | |
12794 | + * at final closing a file, eg, hfsplus. | |
12795 | + * | |
12796 | + * This trick is very simple and stupid, just to open the file before really | |
12797 | + * neceeary open to tell hfsplus that this is not the final closing. | |
12798 | + * The caller should call au_h_open_pre() after acquiring the inode mutex, | |
12799 | + * and au_h_open_post() after releasing it. | |
12800 | + */ | |
1facf9fc | 12801 | + |
4a4d8108 AM |
12802 | +#include <linux/file.h> |
12803 | +#include "aufs.h" | |
1facf9fc | 12804 | + |
4a4d8108 AM |
12805 | +struct file *au_h_open_pre(struct dentry *dentry, aufs_bindex_t bindex) |
12806 | +{ | |
12807 | + struct file *h_file; | |
12808 | + struct dentry *h_dentry; | |
1facf9fc | 12809 | + |
4a4d8108 AM |
12810 | + h_dentry = au_h_dptr(dentry, bindex); |
12811 | + AuDebugOn(!h_dentry); | |
12812 | + AuDebugOn(!h_dentry->d_inode); | |
12813 | + IMustLock(h_dentry->d_inode); | |
12814 | + | |
12815 | + h_file = NULL; | |
12816 | + if (au_test_hfsplus(h_dentry->d_sb) | |
12817 | + && S_ISREG(h_dentry->d_inode->i_mode)) | |
12818 | + h_file = au_h_open(dentry, bindex, | |
12819 | + O_RDONLY | O_NOATIME | O_LARGEFILE, | |
12820 | + /*file*/NULL); | |
12821 | + return h_file; | |
1facf9fc | 12822 | +} |
12823 | + | |
4a4d8108 AM |
12824 | +void au_h_open_post(struct dentry *dentry, aufs_bindex_t bindex, |
12825 | + struct file *h_file) | |
12826 | +{ | |
12827 | + if (h_file) { | |
12828 | + fput(h_file); | |
12829 | + au_sbr_put(dentry->d_sb, bindex); | |
12830 | + } | |
12831 | +} | |
7f207e10 AM |
12832 | diff -urN /usr/share/empty/fs/aufs/hnotify.c linux/fs/aufs/hnotify.c |
12833 | --- /usr/share/empty/fs/aufs/hnotify.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
12834 | +++ linux/fs/aufs/hnotify.c 2011-08-24 13:30:24.731313534 +0200 |
12835 | @@ -0,0 +1,712 @@ | |
e49829fe | 12836 | +/* |
027c5e7a | 12837 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
e49829fe JR |
12838 | + * |
12839 | + * This program, aufs is free software; you can redistribute it and/or modify | |
12840 | + * it under the terms of the GNU General Public License as published by | |
12841 | + * the Free Software Foundation; either version 2 of the License, or | |
12842 | + * (at your option) any later version. | |
12843 | + * | |
12844 | + * This program is distributed in the hope that it will be useful, | |
12845 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12846 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12847 | + * GNU General Public License for more details. | |
12848 | + * | |
12849 | + * You should have received a copy of the GNU General Public License | |
12850 | + * along with this program; if not, write to the Free Software | |
12851 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
12852 | + */ | |
12853 | + | |
12854 | +/* | |
7f207e10 | 12855 | + * abstraction to notify the direct changes on lower directories |
e49829fe JR |
12856 | + */ |
12857 | + | |
12858 | +#include "aufs.h" | |
12859 | + | |
027c5e7a | 12860 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode) |
e49829fe JR |
12861 | +{ |
12862 | + int err; | |
7f207e10 | 12863 | + struct au_hnotify *hn; |
1facf9fc | 12864 | + |
4a4d8108 AM |
12865 | + err = -ENOMEM; |
12866 | + hn = au_cache_alloc_hnotify(); | |
12867 | + if (hn) { | |
12868 | + hn->hn_aufs_inode = inode; | |
027c5e7a AM |
12869 | + hinode->hi_notify = hn; |
12870 | + err = au_hnotify_op.alloc(hinode); | |
12871 | + AuTraceErr(err); | |
12872 | + if (unlikely(err)) { | |
12873 | + hinode->hi_notify = NULL; | |
4a4d8108 AM |
12874 | + au_cache_free_hnotify(hn); |
12875 | + /* | |
12876 | + * The upper dir was removed by udba, but the same named | |
12877 | + * dir left. In this case, aufs assignes a new inode | |
12878 | + * number and set the monitor again. | |
12879 | + * For the lower dir, the old monitnor is still left. | |
12880 | + */ | |
12881 | + if (err == -EEXIST) | |
12882 | + err = 0; | |
12883 | + } | |
1308ab2a | 12884 | + } |
1308ab2a | 12885 | + |
027c5e7a | 12886 | + AuTraceErr(err); |
1308ab2a | 12887 | + return err; |
dece6358 | 12888 | +} |
1facf9fc | 12889 | + |
4a4d8108 | 12890 | +void au_hn_free(struct au_hinode *hinode) |
dece6358 | 12891 | +{ |
4a4d8108 | 12892 | + struct au_hnotify *hn; |
1facf9fc | 12893 | + |
4a4d8108 AM |
12894 | + hn = hinode->hi_notify; |
12895 | + if (hn) { | |
027c5e7a | 12896 | + au_hnotify_op.free(hinode); |
4a4d8108 AM |
12897 | + au_cache_free_hnotify(hn); |
12898 | + hinode->hi_notify = NULL; | |
12899 | + } | |
12900 | +} | |
dece6358 | 12901 | + |
4a4d8108 | 12902 | +/* ---------------------------------------------------------------------- */ |
dece6358 | 12903 | + |
4a4d8108 AM |
12904 | +void au_hn_ctl(struct au_hinode *hinode, int do_set) |
12905 | +{ | |
12906 | + if (hinode->hi_notify) | |
12907 | + au_hnotify_op.ctl(hinode, do_set); | |
12908 | +} | |
12909 | + | |
12910 | +void au_hn_reset(struct inode *inode, unsigned int flags) | |
12911 | +{ | |
12912 | + aufs_bindex_t bindex, bend; | |
12913 | + struct inode *hi; | |
12914 | + struct dentry *iwhdentry; | |
1facf9fc | 12915 | + |
1308ab2a | 12916 | + bend = au_ibend(inode); |
4a4d8108 AM |
12917 | + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) { |
12918 | + hi = au_h_iptr(inode, bindex); | |
12919 | + if (!hi) | |
12920 | + continue; | |
1308ab2a | 12921 | + |
4a4d8108 AM |
12922 | + /* mutex_lock_nested(&hi->i_mutex, AuLsc_I_CHILD); */ |
12923 | + iwhdentry = au_hi_wh(inode, bindex); | |
12924 | + if (iwhdentry) | |
12925 | + dget(iwhdentry); | |
12926 | + au_igrab(hi); | |
12927 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
12928 | + au_set_h_iptr(inode, bindex, au_igrab(hi), | |
12929 | + flags & ~AuHi_XINO); | |
12930 | + iput(hi); | |
12931 | + dput(iwhdentry); | |
12932 | + /* mutex_unlock(&hi->i_mutex); */ | |
1facf9fc | 12933 | + } |
1facf9fc | 12934 | +} |
12935 | + | |
1308ab2a | 12936 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 12937 | + |
4a4d8108 | 12938 | +static int hn_xino(struct inode *inode, struct inode *h_inode) |
1facf9fc | 12939 | +{ |
4a4d8108 AM |
12940 | + int err; |
12941 | + aufs_bindex_t bindex, bend, bfound, bstart; | |
12942 | + struct inode *h_i; | |
1facf9fc | 12943 | + |
4a4d8108 AM |
12944 | + err = 0; |
12945 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
12946 | + pr_warning("branch root dir was changed\n"); | |
12947 | + goto out; | |
12948 | + } | |
1facf9fc | 12949 | + |
4a4d8108 AM |
12950 | + bfound = -1; |
12951 | + bend = au_ibend(inode); | |
12952 | + bstart = au_ibstart(inode); | |
12953 | +#if 0 /* reserved for future use */ | |
12954 | + if (bindex == bend) { | |
12955 | + /* keep this ino in rename case */ | |
12956 | + goto out; | |
12957 | + } | |
12958 | +#endif | |
12959 | + for (bindex = bstart; bindex <= bend; bindex++) | |
12960 | + if (au_h_iptr(inode, bindex) == h_inode) { | |
12961 | + bfound = bindex; | |
12962 | + break; | |
12963 | + } | |
12964 | + if (bfound < 0) | |
1308ab2a | 12965 | + goto out; |
1facf9fc | 12966 | + |
4a4d8108 AM |
12967 | + for (bindex = bstart; bindex <= bend; bindex++) { |
12968 | + h_i = au_h_iptr(inode, bindex); | |
12969 | + if (!h_i) | |
12970 | + continue; | |
1facf9fc | 12971 | + |
4a4d8108 AM |
12972 | + err = au_xino_write(inode->i_sb, bindex, h_i->i_ino, /*ino*/0); |
12973 | + /* ignore this error */ | |
12974 | + /* bad action? */ | |
1facf9fc | 12975 | + } |
1facf9fc | 12976 | + |
4a4d8108 | 12977 | + /* children inode number will be broken */ |
1facf9fc | 12978 | + |
4f0767ce | 12979 | +out: |
4a4d8108 AM |
12980 | + AuTraceErr(err); |
12981 | + return err; | |
1facf9fc | 12982 | +} |
12983 | + | |
4a4d8108 | 12984 | +static int hn_gen_tree(struct dentry *dentry) |
1facf9fc | 12985 | +{ |
4a4d8108 AM |
12986 | + int err, i, j, ndentry; |
12987 | + struct au_dcsub_pages dpages; | |
12988 | + struct au_dpage *dpage; | |
12989 | + struct dentry **dentries; | |
1facf9fc | 12990 | + |
4a4d8108 AM |
12991 | + err = au_dpages_init(&dpages, GFP_NOFS); |
12992 | + if (unlikely(err)) | |
12993 | + goto out; | |
12994 | + err = au_dcsub_pages(&dpages, dentry, NULL, NULL); | |
12995 | + if (unlikely(err)) | |
12996 | + goto out_dpages; | |
1facf9fc | 12997 | + |
4a4d8108 AM |
12998 | + for (i = 0; i < dpages.ndpage; i++) { |
12999 | + dpage = dpages.dpages + i; | |
13000 | + dentries = dpage->dentries; | |
13001 | + ndentry = dpage->ndentry; | |
13002 | + for (j = 0; j < ndentry; j++) { | |
13003 | + struct dentry *d; | |
13004 | + | |
13005 | + d = dentries[j]; | |
13006 | + if (IS_ROOT(d)) | |
13007 | + continue; | |
13008 | + | |
4a4d8108 AM |
13009 | + au_digen_dec(d); |
13010 | + if (d->d_inode) | |
13011 | + /* todo: reset children xino? | |
13012 | + cached children only? */ | |
13013 | + au_iigen_dec(d->d_inode); | |
1308ab2a | 13014 | + } |
dece6358 | 13015 | + } |
1facf9fc | 13016 | + |
4f0767ce | 13017 | +out_dpages: |
4a4d8108 | 13018 | + au_dpages_free(&dpages); |
dece6358 | 13019 | + |
027c5e7a | 13020 | +#if 0 |
4a4d8108 AM |
13021 | + /* discard children */ |
13022 | + dentry_unhash(dentry); | |
13023 | + dput(dentry); | |
027c5e7a | 13024 | +#endif |
4f0767ce | 13025 | +out: |
dece6358 AM |
13026 | + return err; |
13027 | +} | |
13028 | + | |
1308ab2a | 13029 | +/* |
4a4d8108 | 13030 | + * return 0 if processed. |
1308ab2a | 13031 | + */ |
4a4d8108 AM |
13032 | +static int hn_gen_by_inode(char *name, unsigned int nlen, struct inode *inode, |
13033 | + const unsigned int isdir) | |
dece6358 | 13034 | +{ |
1308ab2a | 13035 | + int err; |
4a4d8108 AM |
13036 | + struct dentry *d; |
13037 | + struct qstr *dname; | |
1facf9fc | 13038 | + |
4a4d8108 AM |
13039 | + err = 1; |
13040 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
13041 | + pr_warning("branch root dir was changed\n"); | |
13042 | + err = 0; | |
13043 | + goto out; | |
13044 | + } | |
dece6358 | 13045 | + |
4a4d8108 AM |
13046 | + if (!isdir) { |
13047 | + AuDebugOn(!name); | |
13048 | + au_iigen_dec(inode); | |
027c5e7a | 13049 | + spin_lock(&inode->i_lock); |
4a4d8108 | 13050 | + list_for_each_entry(d, &inode->i_dentry, d_alias) { |
027c5e7a | 13051 | + spin_lock(&d->d_lock); |
4a4d8108 AM |
13052 | + dname = &d->d_name; |
13053 | + if (dname->len != nlen | |
027c5e7a AM |
13054 | + && memcmp(dname->name, name, nlen)) { |
13055 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 13056 | + continue; |
027c5e7a | 13057 | + } |
4a4d8108 | 13058 | + err = 0; |
4a4d8108 AM |
13059 | + au_digen_dec(d); |
13060 | + spin_unlock(&d->d_lock); | |
13061 | + break; | |
1facf9fc | 13062 | + } |
027c5e7a | 13063 | + spin_unlock(&inode->i_lock); |
1308ab2a | 13064 | + } else { |
027c5e7a | 13065 | + au_fset_si(au_sbi(inode->i_sb), FAILED_REFRESH_DIR); |
4a4d8108 AM |
13066 | + d = d_find_alias(inode); |
13067 | + if (!d) { | |
13068 | + au_iigen_dec(inode); | |
13069 | + goto out; | |
13070 | + } | |
1facf9fc | 13071 | + |
027c5e7a | 13072 | + spin_lock(&d->d_lock); |
4a4d8108 | 13073 | + dname = &d->d_name; |
027c5e7a AM |
13074 | + if (dname->len == nlen && !memcmp(dname->name, name, nlen)) { |
13075 | + spin_unlock(&d->d_lock); | |
4a4d8108 | 13076 | + err = hn_gen_tree(d); |
027c5e7a AM |
13077 | + spin_lock(&d->d_lock); |
13078 | + } | |
13079 | + spin_unlock(&d->d_lock); | |
4a4d8108 AM |
13080 | + dput(d); |
13081 | + } | |
1facf9fc | 13082 | + |
4f0767ce | 13083 | +out: |
4a4d8108 | 13084 | + AuTraceErr(err); |
1308ab2a | 13085 | + return err; |
13086 | +} | |
dece6358 | 13087 | + |
4a4d8108 | 13088 | +static int hn_gen_by_name(struct dentry *dentry, const unsigned int isdir) |
1facf9fc | 13089 | +{ |
4a4d8108 AM |
13090 | + int err; |
13091 | + struct inode *inode; | |
1facf9fc | 13092 | + |
4a4d8108 AM |
13093 | + inode = dentry->d_inode; |
13094 | + if (IS_ROOT(dentry) | |
13095 | + /* || (inode && inode->i_ino == AUFS_ROOT_INO) */ | |
13096 | + ) { | |
13097 | + pr_warning("branch root dir was changed\n"); | |
13098 | + return 0; | |
13099 | + } | |
1308ab2a | 13100 | + |
4a4d8108 AM |
13101 | + err = 0; |
13102 | + if (!isdir) { | |
4a4d8108 AM |
13103 | + au_digen_dec(dentry); |
13104 | + if (inode) | |
13105 | + au_iigen_dec(inode); | |
13106 | + } else { | |
027c5e7a | 13107 | + au_fset_si(au_sbi(dentry->d_sb), FAILED_REFRESH_DIR); |
4a4d8108 AM |
13108 | + if (inode) |
13109 | + err = hn_gen_tree(dentry); | |
13110 | + } | |
13111 | + | |
13112 | + AuTraceErr(err); | |
13113 | + return err; | |
1facf9fc | 13114 | +} |
13115 | + | |
4a4d8108 | 13116 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 13117 | + |
4a4d8108 AM |
13118 | +/* hnotify job flags */ |
13119 | +#define AuHnJob_XINO0 1 | |
13120 | +#define AuHnJob_GEN (1 << 1) | |
13121 | +#define AuHnJob_DIRENT (1 << 2) | |
13122 | +#define AuHnJob_ISDIR (1 << 3) | |
13123 | +#define AuHnJob_TRYXINO0 (1 << 4) | |
13124 | +#define AuHnJob_MNTPNT (1 << 5) | |
13125 | +#define au_ftest_hnjob(flags, name) ((flags) & AuHnJob_##name) | |
7f207e10 AM |
13126 | +#define au_fset_hnjob(flags, name) \ |
13127 | + do { (flags) |= AuHnJob_##name; } while (0) | |
13128 | +#define au_fclr_hnjob(flags, name) \ | |
13129 | + do { (flags) &= ~AuHnJob_##name; } while (0) | |
1facf9fc | 13130 | + |
4a4d8108 AM |
13131 | +enum { |
13132 | + AuHn_CHILD, | |
13133 | + AuHn_PARENT, | |
13134 | + AuHnLast | |
13135 | +}; | |
1facf9fc | 13136 | + |
4a4d8108 AM |
13137 | +struct au_hnotify_args { |
13138 | + struct inode *h_dir, *dir, *h_child_inode; | |
13139 | + u32 mask; | |
13140 | + unsigned int flags[AuHnLast]; | |
13141 | + unsigned int h_child_nlen; | |
13142 | + char h_child_name[]; | |
13143 | +}; | |
1facf9fc | 13144 | + |
4a4d8108 AM |
13145 | +struct hn_job_args { |
13146 | + unsigned int flags; | |
13147 | + struct inode *inode, *h_inode, *dir, *h_dir; | |
13148 | + struct dentry *dentry; | |
13149 | + char *h_name; | |
13150 | + int h_nlen; | |
13151 | +}; | |
1308ab2a | 13152 | + |
4a4d8108 AM |
13153 | +static int hn_job(struct hn_job_args *a) |
13154 | +{ | |
13155 | + const unsigned int isdir = au_ftest_hnjob(a->flags, ISDIR); | |
1308ab2a | 13156 | + |
4a4d8108 AM |
13157 | + /* reset xino */ |
13158 | + if (au_ftest_hnjob(a->flags, XINO0) && a->inode) | |
13159 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
1308ab2a | 13160 | + |
4a4d8108 AM |
13161 | + if (au_ftest_hnjob(a->flags, TRYXINO0) |
13162 | + && a->inode | |
13163 | + && a->h_inode) { | |
13164 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
13165 | + if (!a->h_inode->i_nlink) | |
13166 | + hn_xino(a->inode, a->h_inode); /* ignore this error */ | |
13167 | + mutex_unlock(&a->h_inode->i_mutex); | |
1308ab2a | 13168 | + } |
1facf9fc | 13169 | + |
4a4d8108 AM |
13170 | + /* make the generation obsolete */ |
13171 | + if (au_ftest_hnjob(a->flags, GEN)) { | |
13172 | + int err = -1; | |
13173 | + if (a->inode) | |
13174 | + err = hn_gen_by_inode(a->h_name, a->h_nlen, a->inode, | |
13175 | + isdir); | |
13176 | + if (err && a->dentry) | |
13177 | + hn_gen_by_name(a->dentry, isdir); | |
13178 | + /* ignore this error */ | |
1facf9fc | 13179 | + } |
1facf9fc | 13180 | + |
4a4d8108 AM |
13181 | + /* make dir entries obsolete */ |
13182 | + if (au_ftest_hnjob(a->flags, DIRENT) && a->inode) { | |
13183 | + struct au_vdir *vdir; | |
1facf9fc | 13184 | + |
4a4d8108 AM |
13185 | + vdir = au_ivdir(a->inode); |
13186 | + if (vdir) | |
13187 | + vdir->vd_jiffy = 0; | |
13188 | + /* IMustLock(a->inode); */ | |
13189 | + /* a->inode->i_version++; */ | |
13190 | + } | |
1facf9fc | 13191 | + |
4a4d8108 AM |
13192 | + /* can do nothing but warn */ |
13193 | + if (au_ftest_hnjob(a->flags, MNTPNT) | |
13194 | + && a->dentry | |
13195 | + && d_mountpoint(a->dentry)) | |
13196 | + pr_warning("mount-point %.*s is removed or renamed\n", | |
13197 | + AuDLNPair(a->dentry)); | |
1facf9fc | 13198 | + |
4a4d8108 | 13199 | + return 0; |
1308ab2a | 13200 | +} |
1facf9fc | 13201 | + |
1308ab2a | 13202 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 13203 | + |
4a4d8108 AM |
13204 | +static struct dentry *lookup_wlock_by_name(char *name, unsigned int nlen, |
13205 | + struct inode *dir) | |
1308ab2a | 13206 | +{ |
4a4d8108 AM |
13207 | + struct dentry *dentry, *d, *parent; |
13208 | + struct qstr *dname; | |
1308ab2a | 13209 | + |
4a4d8108 AM |
13210 | + parent = d_find_alias(dir); |
13211 | + if (!parent) | |
13212 | + return NULL; | |
1308ab2a | 13213 | + |
4a4d8108 | 13214 | + dentry = NULL; |
027c5e7a | 13215 | + spin_lock(&parent->d_lock); |
4a4d8108 AM |
13216 | + list_for_each_entry(d, &parent->d_subdirs, d_u.d_child) { |
13217 | + /* AuDbg("%.*s\n", AuDLNPair(d)); */ | |
027c5e7a | 13218 | + spin_lock_nested(&d->d_lock, DENTRY_D_LOCK_NESTED); |
4a4d8108 AM |
13219 | + dname = &d->d_name; |
13220 | + if (dname->len != nlen || memcmp(dname->name, name, nlen)) | |
027c5e7a AM |
13221 | + goto cont_unlock; |
13222 | + if (au_di(d)) | |
13223 | + au_digen_dec(d); | |
13224 | + else | |
13225 | + goto cont_unlock; | |
13226 | + if (d->d_count) { | |
13227 | + dentry = dget_dlock(d); | |
4a4d8108 | 13228 | + spin_unlock(&d->d_lock); |
027c5e7a | 13229 | + break; |
dece6358 | 13230 | + } |
1facf9fc | 13231 | + |
027c5e7a AM |
13232 | + cont_unlock: |
13233 | + spin_unlock(&d->d_lock); | |
1308ab2a | 13234 | + } |
027c5e7a | 13235 | + spin_unlock(&parent->d_lock); |
4a4d8108 | 13236 | + dput(parent); |
1facf9fc | 13237 | + |
4a4d8108 AM |
13238 | + if (dentry) |
13239 | + di_write_lock_child(dentry); | |
1308ab2a | 13240 | + |
4a4d8108 AM |
13241 | + return dentry; |
13242 | +} | |
dece6358 | 13243 | + |
4a4d8108 AM |
13244 | +static struct inode *lookup_wlock_by_ino(struct super_block *sb, |
13245 | + aufs_bindex_t bindex, ino_t h_ino) | |
13246 | +{ | |
13247 | + struct inode *inode; | |
13248 | + ino_t ino; | |
13249 | + int err; | |
13250 | + | |
13251 | + inode = NULL; | |
13252 | + err = au_xino_read(sb, bindex, h_ino, &ino); | |
13253 | + if (!err && ino) | |
13254 | + inode = ilookup(sb, ino); | |
13255 | + if (!inode) | |
13256 | + goto out; | |
13257 | + | |
13258 | + if (unlikely(inode->i_ino == AUFS_ROOT_INO)) { | |
13259 | + pr_warning("wrong root branch\n"); | |
13260 | + iput(inode); | |
13261 | + inode = NULL; | |
13262 | + goto out; | |
1308ab2a | 13263 | + } |
13264 | + | |
4a4d8108 | 13265 | + ii_write_lock_child(inode); |
1308ab2a | 13266 | + |
4f0767ce | 13267 | +out: |
4a4d8108 | 13268 | + return inode; |
dece6358 AM |
13269 | +} |
13270 | + | |
4a4d8108 | 13271 | +static void au_hn_bh(void *_args) |
1facf9fc | 13272 | +{ |
4a4d8108 AM |
13273 | + struct au_hnotify_args *a = _args; |
13274 | + struct super_block *sb; | |
13275 | + aufs_bindex_t bindex, bend, bfound; | |
13276 | + unsigned char xino, try_iput; | |
1facf9fc | 13277 | + int err; |
1308ab2a | 13278 | + struct inode *inode; |
4a4d8108 AM |
13279 | + ino_t h_ino; |
13280 | + struct hn_job_args args; | |
13281 | + struct dentry *dentry; | |
13282 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 13283 | + |
4a4d8108 AM |
13284 | + AuDebugOn(!_args); |
13285 | + AuDebugOn(!a->h_dir); | |
13286 | + AuDebugOn(!a->dir); | |
13287 | + AuDebugOn(!a->mask); | |
13288 | + AuDbg("mask 0x%x, i%lu, hi%lu, hci%lu\n", | |
13289 | + a->mask, a->dir->i_ino, a->h_dir->i_ino, | |
13290 | + a->h_child_inode ? a->h_child_inode->i_ino : 0); | |
1facf9fc | 13291 | + |
4a4d8108 AM |
13292 | + inode = NULL; |
13293 | + dentry = NULL; | |
13294 | + /* | |
13295 | + * do not lock a->dir->i_mutex here | |
13296 | + * because of d_revalidate() may cause a deadlock. | |
13297 | + */ | |
13298 | + sb = a->dir->i_sb; | |
13299 | + AuDebugOn(!sb); | |
13300 | + sbinfo = au_sbi(sb); | |
13301 | + AuDebugOn(!sbinfo); | |
7f207e10 | 13302 | + si_write_lock(sb, AuLock_NOPLMW); |
1facf9fc | 13303 | + |
4a4d8108 AM |
13304 | + ii_read_lock_parent(a->dir); |
13305 | + bfound = -1; | |
13306 | + bend = au_ibend(a->dir); | |
13307 | + for (bindex = au_ibstart(a->dir); bindex <= bend; bindex++) | |
13308 | + if (au_h_iptr(a->dir, bindex) == a->h_dir) { | |
13309 | + bfound = bindex; | |
13310 | + break; | |
13311 | + } | |
13312 | + ii_read_unlock(a->dir); | |
13313 | + if (unlikely(bfound < 0)) | |
13314 | + goto out; | |
1facf9fc | 13315 | + |
4a4d8108 AM |
13316 | + xino = !!au_opt_test(au_mntflags(sb), XINO); |
13317 | + h_ino = 0; | |
13318 | + if (a->h_child_inode) | |
13319 | + h_ino = a->h_child_inode->i_ino; | |
1facf9fc | 13320 | + |
4a4d8108 AM |
13321 | + if (a->h_child_nlen |
13322 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], GEN) | |
13323 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], MNTPNT))) | |
13324 | + dentry = lookup_wlock_by_name(a->h_child_name, a->h_child_nlen, | |
13325 | + a->dir); | |
13326 | + try_iput = 0; | |
13327 | + if (dentry) | |
13328 | + inode = dentry->d_inode; | |
13329 | + if (xino && !inode && h_ino | |
13330 | + && (au_ftest_hnjob(a->flags[AuHn_CHILD], XINO0) | |
13331 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], TRYXINO0) | |
13332 | + || au_ftest_hnjob(a->flags[AuHn_CHILD], GEN))) { | |
13333 | + inode = lookup_wlock_by_ino(sb, bfound, h_ino); | |
13334 | + try_iput = 1; | |
13335 | + } | |
1facf9fc | 13336 | + |
4a4d8108 AM |
13337 | + args.flags = a->flags[AuHn_CHILD]; |
13338 | + args.dentry = dentry; | |
13339 | + args.inode = inode; | |
13340 | + args.h_inode = a->h_child_inode; | |
13341 | + args.dir = a->dir; | |
13342 | + args.h_dir = a->h_dir; | |
13343 | + args.h_name = a->h_child_name; | |
13344 | + args.h_nlen = a->h_child_nlen; | |
13345 | + err = hn_job(&args); | |
13346 | + if (dentry) { | |
027c5e7a | 13347 | + if (au_di(dentry)) |
4a4d8108 AM |
13348 | + di_write_unlock(dentry); |
13349 | + dput(dentry); | |
13350 | + } | |
13351 | + if (inode && try_iput) { | |
13352 | + ii_write_unlock(inode); | |
13353 | + iput(inode); | |
13354 | + } | |
1facf9fc | 13355 | + |
4a4d8108 AM |
13356 | + ii_write_lock_parent(a->dir); |
13357 | + args.flags = a->flags[AuHn_PARENT]; | |
13358 | + args.dentry = NULL; | |
13359 | + args.inode = a->dir; | |
13360 | + args.h_inode = a->h_dir; | |
13361 | + args.dir = NULL; | |
13362 | + args.h_dir = NULL; | |
13363 | + args.h_name = NULL; | |
13364 | + args.h_nlen = 0; | |
13365 | + err = hn_job(&args); | |
13366 | + ii_write_unlock(a->dir); | |
1facf9fc | 13367 | + |
4f0767ce | 13368 | +out: |
4a4d8108 AM |
13369 | + iput(a->h_child_inode); |
13370 | + iput(a->h_dir); | |
13371 | + iput(a->dir); | |
027c5e7a AM |
13372 | + si_write_unlock(sb); |
13373 | + au_nwt_done(&sbinfo->si_nowait); | |
1308ab2a | 13374 | + kfree(a); |
dece6358 | 13375 | +} |
1facf9fc | 13376 | + |
4a4d8108 AM |
13377 | +/* ---------------------------------------------------------------------- */ |
13378 | + | |
13379 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
13380 | + struct qstr *h_child_qstr, struct inode *h_child_inode) | |
dece6358 | 13381 | +{ |
4a4d8108 | 13382 | + int err, len; |
53392da6 | 13383 | + unsigned int flags[AuHnLast], f; |
4a4d8108 AM |
13384 | + unsigned char isdir, isroot, wh; |
13385 | + struct inode *dir; | |
13386 | + struct au_hnotify_args *args; | |
13387 | + char *p, *h_child_name; | |
dece6358 | 13388 | + |
1308ab2a | 13389 | + err = 0; |
4a4d8108 AM |
13390 | + AuDebugOn(!hnotify || !hnotify->hn_aufs_inode); |
13391 | + dir = igrab(hnotify->hn_aufs_inode); | |
13392 | + if (!dir) | |
13393 | + goto out; | |
1facf9fc | 13394 | + |
4a4d8108 AM |
13395 | + isroot = (dir->i_ino == AUFS_ROOT_INO); |
13396 | + wh = 0; | |
13397 | + h_child_name = (void *)h_child_qstr->name; | |
13398 | + len = h_child_qstr->len; | |
13399 | + if (h_child_name) { | |
13400 | + if (len > AUFS_WH_PFX_LEN | |
13401 | + && !memcmp(h_child_name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { | |
13402 | + h_child_name += AUFS_WH_PFX_LEN; | |
13403 | + len -= AUFS_WH_PFX_LEN; | |
13404 | + wh = 1; | |
13405 | + } | |
1facf9fc | 13406 | + } |
dece6358 | 13407 | + |
4a4d8108 AM |
13408 | + isdir = 0; |
13409 | + if (h_child_inode) | |
13410 | + isdir = !!S_ISDIR(h_child_inode->i_mode); | |
13411 | + flags[AuHn_PARENT] = AuHnJob_ISDIR; | |
13412 | + flags[AuHn_CHILD] = 0; | |
13413 | + if (isdir) | |
13414 | + flags[AuHn_CHILD] = AuHnJob_ISDIR; | |
13415 | + au_fset_hnjob(flags[AuHn_PARENT], DIRENT); | |
13416 | + au_fset_hnjob(flags[AuHn_CHILD], GEN); | |
13417 | + switch (mask & FS_EVENTS_POSS_ON_CHILD) { | |
13418 | + case FS_MOVED_FROM: | |
13419 | + case FS_MOVED_TO: | |
13420 | + au_fset_hnjob(flags[AuHn_CHILD], XINO0); | |
13421 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
13422 | + /*FALLTHROUGH*/ | |
13423 | + case FS_CREATE: | |
13424 | + AuDebugOn(!h_child_name || !h_child_inode); | |
13425 | + break; | |
1facf9fc | 13426 | + |
4a4d8108 AM |
13427 | + case FS_DELETE: |
13428 | + /* | |
13429 | + * aufs never be able to get this child inode. | |
13430 | + * revalidation should be in d_revalidate() | |
13431 | + * by checking i_nlink, i_generation or d_unhashed(). | |
13432 | + */ | |
13433 | + AuDebugOn(!h_child_name); | |
13434 | + au_fset_hnjob(flags[AuHn_CHILD], TRYXINO0); | |
13435 | + au_fset_hnjob(flags[AuHn_CHILD], MNTPNT); | |
13436 | + break; | |
dece6358 | 13437 | + |
4a4d8108 AM |
13438 | + default: |
13439 | + AuDebugOn(1); | |
13440 | + } | |
1308ab2a | 13441 | + |
4a4d8108 AM |
13442 | + if (wh) |
13443 | + h_child_inode = NULL; | |
1308ab2a | 13444 | + |
4a4d8108 AM |
13445 | + err = -ENOMEM; |
13446 | + /* iput() and kfree() will be called in au_hnotify() */ | |
4a4d8108 | 13447 | + args = kmalloc(sizeof(*args) + len + 1, GFP_NOFS); |
4a4d8108 AM |
13448 | + if (unlikely(!args)) { |
13449 | + AuErr1("no memory\n"); | |
13450 | + iput(dir); | |
13451 | + goto out; | |
13452 | + } | |
13453 | + args->flags[AuHn_PARENT] = flags[AuHn_PARENT]; | |
13454 | + args->flags[AuHn_CHILD] = flags[AuHn_CHILD]; | |
13455 | + args->mask = mask; | |
13456 | + args->dir = dir; | |
13457 | + args->h_dir = igrab(h_dir); | |
13458 | + if (h_child_inode) | |
13459 | + h_child_inode = igrab(h_child_inode); /* can be NULL */ | |
13460 | + args->h_child_inode = h_child_inode; | |
13461 | + args->h_child_nlen = len; | |
13462 | + if (len) { | |
13463 | + p = (void *)args; | |
13464 | + p += sizeof(*args); | |
13465 | + memcpy(p, h_child_name, len); | |
13466 | + p[len] = 0; | |
1308ab2a | 13467 | + } |
1308ab2a | 13468 | + |
53392da6 AM |
13469 | + f = 0; |
13470 | + if (!dir->i_nlink) | |
13471 | + f = AuWkq_NEST; | |
13472 | + err = au_wkq_nowait(au_hn_bh, args, dir->i_sb, f); | |
4a4d8108 AM |
13473 | + if (unlikely(err)) { |
13474 | + pr_err("wkq %d\n", err); | |
13475 | + iput(args->h_child_inode); | |
13476 | + iput(args->h_dir); | |
13477 | + iput(args->dir); | |
13478 | + kfree(args); | |
1facf9fc | 13479 | + } |
1facf9fc | 13480 | + |
4a4d8108 | 13481 | +out: |
1facf9fc | 13482 | + return err; |
13483 | +} | |
13484 | + | |
027c5e7a AM |
13485 | +/* ---------------------------------------------------------------------- */ |
13486 | + | |
13487 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm) | |
13488 | +{ | |
13489 | + int err; | |
13490 | + | |
13491 | + AuDebugOn(!(udba & AuOptMask_UDBA)); | |
13492 | + | |
13493 | + err = 0; | |
13494 | + if (au_hnotify_op.reset_br) | |
13495 | + err = au_hnotify_op.reset_br(udba, br, perm); | |
13496 | + | |
13497 | + return err; | |
13498 | +} | |
13499 | + | |
13500 | +int au_hnotify_init_br(struct au_branch *br, int perm) | |
13501 | +{ | |
13502 | + int err; | |
13503 | + | |
13504 | + err = 0; | |
13505 | + if (au_hnotify_op.init_br) | |
13506 | + err = au_hnotify_op.init_br(br, perm); | |
13507 | + | |
13508 | + return err; | |
13509 | +} | |
13510 | + | |
13511 | +void au_hnotify_fin_br(struct au_branch *br) | |
13512 | +{ | |
13513 | + if (au_hnotify_op.fin_br) | |
13514 | + au_hnotify_op.fin_br(br); | |
13515 | +} | |
13516 | + | |
4a4d8108 AM |
13517 | +static void au_hn_destroy_cache(void) |
13518 | +{ | |
13519 | + kmem_cache_destroy(au_cachep[AuCache_HNOTIFY]); | |
13520 | + au_cachep[AuCache_HNOTIFY] = NULL; | |
13521 | +} | |
1308ab2a | 13522 | + |
4a4d8108 | 13523 | +int __init au_hnotify_init(void) |
1facf9fc | 13524 | +{ |
1308ab2a | 13525 | + int err; |
1308ab2a | 13526 | + |
4a4d8108 AM |
13527 | + err = -ENOMEM; |
13528 | + au_cachep[AuCache_HNOTIFY] = AuCache(au_hnotify); | |
13529 | + if (au_cachep[AuCache_HNOTIFY]) { | |
027c5e7a AM |
13530 | + err = 0; |
13531 | + if (au_hnotify_op.init) | |
13532 | + err = au_hnotify_op.init(); | |
4a4d8108 AM |
13533 | + if (unlikely(err)) |
13534 | + au_hn_destroy_cache(); | |
1308ab2a | 13535 | + } |
1308ab2a | 13536 | + AuTraceErr(err); |
4a4d8108 | 13537 | + return err; |
1308ab2a | 13538 | +} |
13539 | + | |
4a4d8108 | 13540 | +void au_hnotify_fin(void) |
1308ab2a | 13541 | +{ |
027c5e7a AM |
13542 | + if (au_hnotify_op.fin) |
13543 | + au_hnotify_op.fin(); | |
4a4d8108 AM |
13544 | + /* cf. au_cache_fin() */ |
13545 | + if (au_cachep[AuCache_HNOTIFY]) | |
13546 | + au_hn_destroy_cache(); | |
dece6358 | 13547 | +} |
7f207e10 AM |
13548 | diff -urN /usr/share/empty/fs/aufs/iinfo.c linux/fs/aufs/iinfo.c |
13549 | --- /usr/share/empty/fs/aufs/iinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 13550 | +++ linux/fs/aufs/iinfo.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 13551 | @@ -0,0 +1,264 @@ |
dece6358 | 13552 | +/* |
027c5e7a | 13553 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
dece6358 AM |
13554 | + * |
13555 | + * This program, aufs is free software; you can redistribute it and/or modify | |
13556 | + * it under the terms of the GNU General Public License as published by | |
13557 | + * the Free Software Foundation; either version 2 of the License, or | |
13558 | + * (at your option) any later version. | |
13559 | + * | |
13560 | + * This program is distributed in the hope that it will be useful, | |
13561 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13562 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13563 | + * GNU General Public License for more details. | |
13564 | + * | |
13565 | + * You should have received a copy of the GNU General Public License | |
13566 | + * along with this program; if not, write to the Free Software | |
13567 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
13568 | + */ | |
1facf9fc | 13569 | + |
dece6358 | 13570 | +/* |
4a4d8108 | 13571 | + * inode private data |
dece6358 | 13572 | + */ |
1facf9fc | 13573 | + |
1308ab2a | 13574 | +#include "aufs.h" |
1facf9fc | 13575 | + |
4a4d8108 | 13576 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 13577 | +{ |
4a4d8108 | 13578 | + struct inode *h_inode; |
1facf9fc | 13579 | + |
4a4d8108 | 13580 | + IiMustAnyLock(inode); |
1facf9fc | 13581 | + |
4a4d8108 AM |
13582 | + h_inode = au_ii(inode)->ii_hinode[0 + bindex].hi_inode; |
13583 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
13584 | + return h_inode; | |
13585 | +} | |
1facf9fc | 13586 | + |
4a4d8108 AM |
13587 | +/* todo: hard/soft set? */ |
13588 | +void au_hiput(struct au_hinode *hinode) | |
13589 | +{ | |
13590 | + au_hn_free(hinode); | |
13591 | + dput(hinode->hi_whdentry); | |
13592 | + iput(hinode->hi_inode); | |
13593 | +} | |
1facf9fc | 13594 | + |
4a4d8108 AM |
13595 | +unsigned int au_hi_flags(struct inode *inode, int isdir) |
13596 | +{ | |
13597 | + unsigned int flags; | |
13598 | + const unsigned int mnt_flags = au_mntflags(inode->i_sb); | |
1facf9fc | 13599 | + |
4a4d8108 AM |
13600 | + flags = 0; |
13601 | + if (au_opt_test(mnt_flags, XINO)) | |
13602 | + au_fset_hi(flags, XINO); | |
13603 | + if (isdir && au_opt_test(mnt_flags, UDBA_HNOTIFY)) | |
13604 | + au_fset_hi(flags, HNOTIFY); | |
13605 | + return flags; | |
1facf9fc | 13606 | +} |
13607 | + | |
4a4d8108 AM |
13608 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
13609 | + struct inode *h_inode, unsigned int flags) | |
1308ab2a | 13610 | +{ |
4a4d8108 AM |
13611 | + struct au_hinode *hinode; |
13612 | + struct inode *hi; | |
13613 | + struct au_iinfo *iinfo = au_ii(inode); | |
1facf9fc | 13614 | + |
4a4d8108 | 13615 | + IiMustWriteLock(inode); |
dece6358 | 13616 | + |
4a4d8108 AM |
13617 | + hinode = iinfo->ii_hinode + bindex; |
13618 | + hi = hinode->hi_inode; | |
13619 | + AuDebugOn(h_inode && atomic_read(&h_inode->i_count) <= 0); | |
13620 | + | |
13621 | + if (hi) | |
13622 | + au_hiput(hinode); | |
13623 | + hinode->hi_inode = h_inode; | |
13624 | + if (h_inode) { | |
13625 | + int err; | |
13626 | + struct super_block *sb = inode->i_sb; | |
13627 | + struct au_branch *br; | |
13628 | + | |
027c5e7a AM |
13629 | + AuDebugOn(inode->i_mode |
13630 | + && (h_inode->i_mode & S_IFMT) | |
13631 | + != (inode->i_mode & S_IFMT)); | |
4a4d8108 AM |
13632 | + if (bindex == iinfo->ii_bstart) |
13633 | + au_cpup_igen(inode, h_inode); | |
13634 | + br = au_sbr(sb, bindex); | |
13635 | + hinode->hi_id = br->br_id; | |
13636 | + if (au_ftest_hi(flags, XINO)) { | |
13637 | + err = au_xino_write(sb, bindex, h_inode->i_ino, | |
13638 | + inode->i_ino); | |
13639 | + if (unlikely(err)) | |
13640 | + AuIOErr1("failed au_xino_write() %d\n", err); | |
13641 | + } | |
13642 | + | |
13643 | + if (au_ftest_hi(flags, HNOTIFY) | |
13644 | + && au_br_hnotifyable(br->br_perm)) { | |
027c5e7a | 13645 | + err = au_hn_alloc(hinode, inode); |
4a4d8108 AM |
13646 | + if (unlikely(err)) |
13647 | + AuIOErr1("au_hn_alloc() %d\n", err); | |
1308ab2a | 13648 | + } |
13649 | + } | |
4a4d8108 | 13650 | +} |
dece6358 | 13651 | + |
4a4d8108 AM |
13652 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, |
13653 | + struct dentry *h_wh) | |
13654 | +{ | |
13655 | + struct au_hinode *hinode; | |
dece6358 | 13656 | + |
4a4d8108 AM |
13657 | + IiMustWriteLock(inode); |
13658 | + | |
13659 | + hinode = au_ii(inode)->ii_hinode + bindex; | |
13660 | + AuDebugOn(hinode->hi_whdentry); | |
13661 | + hinode->hi_whdentry = h_wh; | |
1facf9fc | 13662 | +} |
13663 | + | |
4a4d8108 | 13664 | +void au_update_iigen(struct inode *inode) |
1308ab2a | 13665 | +{ |
4a4d8108 AM |
13666 | + atomic_set(&au_ii(inode)->ii_generation, au_sigen(inode->i_sb)); |
13667 | + /* smp_mb(); */ /* atomic_set */ | |
13668 | +} | |
1facf9fc | 13669 | + |
4a4d8108 AM |
13670 | +/* it may be called at remount time, too */ |
13671 | +void au_update_ibrange(struct inode *inode, int do_put_zero) | |
13672 | +{ | |
13673 | + struct au_iinfo *iinfo; | |
027c5e7a | 13674 | + aufs_bindex_t bindex, bend; |
1facf9fc | 13675 | + |
4a4d8108 | 13676 | + iinfo = au_ii(inode); |
027c5e7a | 13677 | + if (!iinfo) |
4a4d8108 | 13678 | + return; |
1facf9fc | 13679 | + |
4a4d8108 | 13680 | + IiMustWriteLock(inode); |
1facf9fc | 13681 | + |
027c5e7a | 13682 | + if (do_put_zero && iinfo->ii_bstart >= 0) { |
4a4d8108 AM |
13683 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; |
13684 | + bindex++) { | |
13685 | + struct inode *h_i; | |
1facf9fc | 13686 | + |
4a4d8108 | 13687 | + h_i = iinfo->ii_hinode[0 + bindex].hi_inode; |
027c5e7a AM |
13688 | + if (h_i && !h_i->i_nlink) |
13689 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
13690 | + } | |
4a4d8108 AM |
13691 | + } |
13692 | + | |
027c5e7a AM |
13693 | + iinfo->ii_bstart = -1; |
13694 | + iinfo->ii_bend = -1; | |
13695 | + bend = au_sbend(inode->i_sb); | |
13696 | + for (bindex = 0; bindex <= bend; bindex++) | |
13697 | + if (iinfo->ii_hinode[0 + bindex].hi_inode) { | |
13698 | + iinfo->ii_bstart = bindex; | |
4a4d8108 | 13699 | + break; |
027c5e7a AM |
13700 | + } |
13701 | + if (iinfo->ii_bstart >= 0) | |
13702 | + for (bindex = bend; bindex >= iinfo->ii_bstart; bindex--) | |
13703 | + if (iinfo->ii_hinode[0 + bindex].hi_inode) { | |
13704 | + iinfo->ii_bend = bindex; | |
13705 | + break; | |
13706 | + } | |
13707 | + AuDebugOn(iinfo->ii_bstart > iinfo->ii_bend); | |
1308ab2a | 13708 | +} |
1facf9fc | 13709 | + |
dece6358 | 13710 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 13711 | + |
4a4d8108 | 13712 | +void au_icntnr_init_once(void *_c) |
dece6358 | 13713 | +{ |
4a4d8108 AM |
13714 | + struct au_icntnr *c = _c; |
13715 | + struct au_iinfo *iinfo = &c->iinfo; | |
e49829fe | 13716 | + static struct lock_class_key aufs_ii; |
1facf9fc | 13717 | + |
4a4d8108 | 13718 | + au_rw_init(&iinfo->ii_rwsem); |
e49829fe | 13719 | + au_rw_class(&iinfo->ii_rwsem, &aufs_ii); |
4a4d8108 AM |
13720 | + inode_init_once(&c->vfs_inode); |
13721 | +} | |
1facf9fc | 13722 | + |
4a4d8108 AM |
13723 | +int au_iinfo_init(struct inode *inode) |
13724 | +{ | |
13725 | + struct au_iinfo *iinfo; | |
13726 | + struct super_block *sb; | |
13727 | + int nbr, i; | |
1facf9fc | 13728 | + |
4a4d8108 AM |
13729 | + sb = inode->i_sb; |
13730 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); | |
13731 | + nbr = au_sbend(sb) + 1; | |
13732 | + if (unlikely(nbr <= 0)) | |
13733 | + nbr = 1; | |
13734 | + iinfo->ii_hinode = kcalloc(nbr, sizeof(*iinfo->ii_hinode), GFP_NOFS); | |
13735 | + if (iinfo->ii_hinode) { | |
7f207e10 | 13736 | + au_ninodes_inc(sb); |
4a4d8108 AM |
13737 | + for (i = 0; i < nbr; i++) |
13738 | + iinfo->ii_hinode[i].hi_id = -1; | |
1facf9fc | 13739 | + |
4a4d8108 AM |
13740 | + atomic_set(&iinfo->ii_generation, au_sigen(sb)); |
13741 | + /* smp_mb(); */ /* atomic_set */ | |
13742 | + iinfo->ii_bstart = -1; | |
13743 | + iinfo->ii_bend = -1; | |
13744 | + iinfo->ii_vdir = NULL; | |
13745 | + return 0; | |
1308ab2a | 13746 | + } |
4a4d8108 AM |
13747 | + return -ENOMEM; |
13748 | +} | |
1facf9fc | 13749 | + |
4a4d8108 AM |
13750 | +int au_ii_realloc(struct au_iinfo *iinfo, int nbr) |
13751 | +{ | |
13752 | + int err, sz; | |
13753 | + struct au_hinode *hip; | |
1facf9fc | 13754 | + |
4a4d8108 AM |
13755 | + AuRwMustWriteLock(&iinfo->ii_rwsem); |
13756 | + | |
13757 | + err = -ENOMEM; | |
13758 | + sz = sizeof(*hip) * (iinfo->ii_bend + 1); | |
13759 | + if (!sz) | |
13760 | + sz = sizeof(*hip); | |
13761 | + hip = au_kzrealloc(iinfo->ii_hinode, sz, sizeof(*hip) * nbr, GFP_NOFS); | |
13762 | + if (hip) { | |
13763 | + iinfo->ii_hinode = hip; | |
13764 | + err = 0; | |
1308ab2a | 13765 | + } |
4a4d8108 | 13766 | + |
1308ab2a | 13767 | + return err; |
1facf9fc | 13768 | +} |
13769 | + | |
4a4d8108 | 13770 | +void au_iinfo_fin(struct inode *inode) |
1facf9fc | 13771 | +{ |
4a4d8108 AM |
13772 | + struct au_iinfo *iinfo; |
13773 | + struct au_hinode *hi; | |
13774 | + struct super_block *sb; | |
b752ccd1 AM |
13775 | + aufs_bindex_t bindex, bend; |
13776 | + const unsigned char unlinked = !inode->i_nlink; | |
1308ab2a | 13777 | + |
4a4d8108 AM |
13778 | + iinfo = au_ii(inode); |
13779 | + /* bad_inode case */ | |
13780 | + if (!iinfo) | |
13781 | + return; | |
1308ab2a | 13782 | + |
b752ccd1 | 13783 | + sb = inode->i_sb; |
7f207e10 | 13784 | + au_ninodes_dec(sb); |
b752ccd1 AM |
13785 | + if (si_pid_test(sb)) |
13786 | + au_xino_delete_inode(inode, unlinked); | |
13787 | + else { | |
13788 | + /* | |
13789 | + * it is safe to hide the dependency between sbinfo and | |
13790 | + * sb->s_umount. | |
13791 | + */ | |
13792 | + lockdep_off(); | |
13793 | + si_noflush_read_lock(sb); | |
13794 | + au_xino_delete_inode(inode, unlinked); | |
13795 | + si_read_unlock(sb); | |
13796 | + lockdep_on(); | |
13797 | + } | |
13798 | + | |
4a4d8108 AM |
13799 | + if (iinfo->ii_vdir) |
13800 | + au_vdir_free(iinfo->ii_vdir); | |
1308ab2a | 13801 | + |
b752ccd1 AM |
13802 | + bindex = iinfo->ii_bstart; |
13803 | + if (bindex >= 0) { | |
13804 | + hi = iinfo->ii_hinode + bindex; | |
4a4d8108 | 13805 | + bend = iinfo->ii_bend; |
b752ccd1 AM |
13806 | + while (bindex++ <= bend) { |
13807 | + if (hi->hi_inode) | |
4a4d8108 | 13808 | + au_hiput(hi); |
4a4d8108 AM |
13809 | + hi++; |
13810 | + } | |
13811 | + } | |
4a4d8108 | 13812 | + kfree(iinfo->ii_hinode); |
027c5e7a | 13813 | + iinfo->ii_hinode = NULL; |
4a4d8108 | 13814 | + AuRwDestroy(&iinfo->ii_rwsem); |
dece6358 | 13815 | +} |
7f207e10 AM |
13816 | diff -urN /usr/share/empty/fs/aufs/inode.c linux/fs/aufs/inode.c |
13817 | --- /usr/share/empty/fs/aufs/inode.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 13818 | +++ linux/fs/aufs/inode.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 13819 | @@ -0,0 +1,471 @@ |
4a4d8108 | 13820 | +/* |
027c5e7a | 13821 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
13822 | + * |
13823 | + * This program, aufs is free software; you can redistribute it and/or modify | |
13824 | + * it under the terms of the GNU General Public License as published by | |
13825 | + * the Free Software Foundation; either version 2 of the License, or | |
13826 | + * (at your option) any later version. | |
13827 | + * | |
13828 | + * This program is distributed in the hope that it will be useful, | |
13829 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13830 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13831 | + * GNU General Public License for more details. | |
13832 | + * | |
13833 | + * You should have received a copy of the GNU General Public License | |
13834 | + * along with this program; if not, write to the Free Software | |
13835 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
13836 | + */ | |
1facf9fc | 13837 | + |
4a4d8108 AM |
13838 | +/* |
13839 | + * inode functions | |
13840 | + */ | |
1facf9fc | 13841 | + |
4a4d8108 | 13842 | +#include "aufs.h" |
1308ab2a | 13843 | + |
4a4d8108 AM |
13844 | +struct inode *au_igrab(struct inode *inode) |
13845 | +{ | |
13846 | + if (inode) { | |
13847 | + AuDebugOn(!atomic_read(&inode->i_count)); | |
027c5e7a | 13848 | + ihold(inode); |
1facf9fc | 13849 | + } |
4a4d8108 AM |
13850 | + return inode; |
13851 | +} | |
1facf9fc | 13852 | + |
4a4d8108 AM |
13853 | +static void au_refresh_hinode_attr(struct inode *inode, int do_version) |
13854 | +{ | |
13855 | + au_cpup_attr_all(inode, /*force*/0); | |
13856 | + au_update_iigen(inode); | |
13857 | + if (do_version) | |
13858 | + inode->i_version++; | |
dece6358 | 13859 | +} |
1facf9fc | 13860 | + |
027c5e7a | 13861 | +static int au_ii_refresh(struct inode *inode, int *update) |
dece6358 | 13862 | +{ |
4a4d8108 | 13863 | + int err, e; |
027c5e7a | 13864 | + umode_t type; |
4a4d8108 | 13865 | + aufs_bindex_t bindex, new_bindex; |
1308ab2a | 13866 | + struct super_block *sb; |
4a4d8108 | 13867 | + struct au_iinfo *iinfo; |
027c5e7a | 13868 | + struct au_hinode *p, *q, tmp; |
1facf9fc | 13869 | + |
4a4d8108 | 13870 | + IiMustWriteLock(inode); |
1facf9fc | 13871 | + |
027c5e7a | 13872 | + *update = 0; |
4a4d8108 | 13873 | + sb = inode->i_sb; |
027c5e7a | 13874 | + type = inode->i_mode & S_IFMT; |
4a4d8108 AM |
13875 | + iinfo = au_ii(inode); |
13876 | + err = au_ii_realloc(iinfo, au_sbend(sb) + 1); | |
13877 | + if (unlikely(err)) | |
1308ab2a | 13878 | + goto out; |
1facf9fc | 13879 | + |
027c5e7a | 13880 | + AuDebugOn(iinfo->ii_bstart < 0); |
4a4d8108 | 13881 | + p = iinfo->ii_hinode + iinfo->ii_bstart; |
4a4d8108 AM |
13882 | + for (bindex = iinfo->ii_bstart; bindex <= iinfo->ii_bend; |
13883 | + bindex++, p++) { | |
13884 | + if (!p->hi_inode) | |
13885 | + continue; | |
1facf9fc | 13886 | + |
027c5e7a | 13887 | + AuDebugOn(type != (p->hi_inode->i_mode & S_IFMT)); |
4a4d8108 AM |
13888 | + new_bindex = au_br_index(sb, p->hi_id); |
13889 | + if (new_bindex == bindex) | |
13890 | + continue; | |
1facf9fc | 13891 | + |
4a4d8108 | 13892 | + if (new_bindex < 0) { |
027c5e7a | 13893 | + *update = 1; |
4a4d8108 AM |
13894 | + au_hiput(p); |
13895 | + p->hi_inode = NULL; | |
13896 | + continue; | |
1308ab2a | 13897 | + } |
4a4d8108 AM |
13898 | + |
13899 | + if (new_bindex < iinfo->ii_bstart) | |
13900 | + iinfo->ii_bstart = new_bindex; | |
13901 | + if (iinfo->ii_bend < new_bindex) | |
13902 | + iinfo->ii_bend = new_bindex; | |
13903 | + /* swap two lower inode, and loop again */ | |
13904 | + q = iinfo->ii_hinode + new_bindex; | |
13905 | + tmp = *q; | |
13906 | + *q = *p; | |
13907 | + *p = tmp; | |
13908 | + if (tmp.hi_inode) { | |
13909 | + bindex--; | |
13910 | + p--; | |
1308ab2a | 13911 | + } |
13912 | + } | |
4a4d8108 AM |
13913 | + au_update_ibrange(inode, /*do_put_zero*/0); |
13914 | + e = au_dy_irefresh(inode); | |
13915 | + if (unlikely(e && !err)) | |
13916 | + err = e; | |
1facf9fc | 13917 | + |
4f0767ce | 13918 | +out: |
027c5e7a AM |
13919 | + AuTraceErr(err); |
13920 | + return err; | |
13921 | +} | |
13922 | + | |
13923 | +int au_refresh_hinode_self(struct inode *inode) | |
13924 | +{ | |
13925 | + int err, update; | |
13926 | + | |
13927 | + err = au_ii_refresh(inode, &update); | |
13928 | + if (!err) | |
13929 | + au_refresh_hinode_attr(inode, update && S_ISDIR(inode->i_mode)); | |
13930 | + | |
13931 | + AuTraceErr(err); | |
4a4d8108 AM |
13932 | + return err; |
13933 | +} | |
1facf9fc | 13934 | + |
4a4d8108 AM |
13935 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry) |
13936 | +{ | |
027c5e7a | 13937 | + int err, e, update; |
4a4d8108 | 13938 | + unsigned int flags; |
027c5e7a | 13939 | + umode_t mode; |
4a4d8108 | 13940 | + aufs_bindex_t bindex, bend; |
027c5e7a | 13941 | + unsigned char isdir; |
4a4d8108 AM |
13942 | + struct au_hinode *p; |
13943 | + struct au_iinfo *iinfo; | |
1facf9fc | 13944 | + |
027c5e7a | 13945 | + err = au_ii_refresh(inode, &update); |
4a4d8108 AM |
13946 | + if (unlikely(err)) |
13947 | + goto out; | |
13948 | + | |
13949 | + update = 0; | |
13950 | + iinfo = au_ii(inode); | |
13951 | + p = iinfo->ii_hinode + iinfo->ii_bstart; | |
027c5e7a AM |
13952 | + mode = (inode->i_mode & S_IFMT); |
13953 | + isdir = S_ISDIR(mode); | |
4a4d8108 AM |
13954 | + flags = au_hi_flags(inode, isdir); |
13955 | + bend = au_dbend(dentry); | |
13956 | + for (bindex = au_dbstart(dentry); bindex <= bend; bindex++) { | |
13957 | + struct inode *h_i; | |
13958 | + struct dentry *h_d; | |
13959 | + | |
13960 | + h_d = au_h_dptr(dentry, bindex); | |
13961 | + if (!h_d || !h_d->d_inode) | |
13962 | + continue; | |
13963 | + | |
027c5e7a | 13964 | + AuDebugOn(mode != (h_d->d_inode->i_mode & S_IFMT)); |
4a4d8108 AM |
13965 | + if (iinfo->ii_bstart <= bindex && bindex <= iinfo->ii_bend) { |
13966 | + h_i = au_h_iptr(inode, bindex); | |
13967 | + if (h_i) { | |
13968 | + if (h_i == h_d->d_inode) | |
13969 | + continue; | |
13970 | + err = -EIO; | |
13971 | + break; | |
13972 | + } | |
13973 | + } | |
13974 | + if (bindex < iinfo->ii_bstart) | |
13975 | + iinfo->ii_bstart = bindex; | |
13976 | + if (iinfo->ii_bend < bindex) | |
13977 | + iinfo->ii_bend = bindex; | |
13978 | + au_set_h_iptr(inode, bindex, au_igrab(h_d->d_inode), flags); | |
13979 | + update = 1; | |
1308ab2a | 13980 | + } |
4a4d8108 AM |
13981 | + au_update_ibrange(inode, /*do_put_zero*/0); |
13982 | + e = au_dy_irefresh(inode); | |
13983 | + if (unlikely(e && !err)) | |
13984 | + err = e; | |
027c5e7a AM |
13985 | + if (!err) |
13986 | + au_refresh_hinode_attr(inode, update && isdir); | |
4a4d8108 | 13987 | + |
4f0767ce | 13988 | +out: |
4a4d8108 | 13989 | + AuTraceErr(err); |
1308ab2a | 13990 | + return err; |
dece6358 AM |
13991 | +} |
13992 | + | |
4a4d8108 | 13993 | +static int set_inode(struct inode *inode, struct dentry *dentry) |
dece6358 | 13994 | +{ |
4a4d8108 AM |
13995 | + int err; |
13996 | + unsigned int flags; | |
13997 | + umode_t mode; | |
13998 | + aufs_bindex_t bindex, bstart, btail; | |
13999 | + unsigned char isdir; | |
14000 | + struct dentry *h_dentry; | |
14001 | + struct inode *h_inode; | |
14002 | + struct au_iinfo *iinfo; | |
dece6358 | 14003 | + |
4a4d8108 | 14004 | + IiMustWriteLock(inode); |
dece6358 | 14005 | + |
4a4d8108 AM |
14006 | + err = 0; |
14007 | + isdir = 0; | |
14008 | + bstart = au_dbstart(dentry); | |
14009 | + h_inode = au_h_dptr(dentry, bstart)->d_inode; | |
14010 | + mode = h_inode->i_mode; | |
14011 | + switch (mode & S_IFMT) { | |
14012 | + case S_IFREG: | |
14013 | + btail = au_dbtail(dentry); | |
14014 | + inode->i_op = &aufs_iop; | |
14015 | + inode->i_fop = &aufs_file_fop; | |
14016 | + err = au_dy_iaop(inode, bstart, h_inode); | |
14017 | + if (unlikely(err)) | |
14018 | + goto out; | |
14019 | + break; | |
14020 | + case S_IFDIR: | |
14021 | + isdir = 1; | |
14022 | + btail = au_dbtaildir(dentry); | |
14023 | + inode->i_op = &aufs_dir_iop; | |
14024 | + inode->i_fop = &aufs_dir_fop; | |
14025 | + break; | |
14026 | + case S_IFLNK: | |
14027 | + btail = au_dbtail(dentry); | |
14028 | + inode->i_op = &aufs_symlink_iop; | |
14029 | + break; | |
14030 | + case S_IFBLK: | |
14031 | + case S_IFCHR: | |
14032 | + case S_IFIFO: | |
14033 | + case S_IFSOCK: | |
14034 | + btail = au_dbtail(dentry); | |
14035 | + inode->i_op = &aufs_iop; | |
14036 | + au_init_special_fop(inode, mode, h_inode->i_rdev); | |
14037 | + break; | |
14038 | + default: | |
14039 | + AuIOErr("Unknown file type 0%o\n", mode); | |
14040 | + err = -EIO; | |
1308ab2a | 14041 | + goto out; |
4a4d8108 | 14042 | + } |
dece6358 | 14043 | + |
4a4d8108 AM |
14044 | + /* do not set hnotify for whiteouted dirs (SHWH mode) */ |
14045 | + flags = au_hi_flags(inode, isdir); | |
14046 | + if (au_opt_test(au_mntflags(dentry->d_sb), SHWH) | |
14047 | + && au_ftest_hi(flags, HNOTIFY) | |
14048 | + && dentry->d_name.len > AUFS_WH_PFX_LEN | |
14049 | + && !memcmp(dentry->d_name.name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) | |
14050 | + au_fclr_hi(flags, HNOTIFY); | |
14051 | + iinfo = au_ii(inode); | |
14052 | + iinfo->ii_bstart = bstart; | |
14053 | + iinfo->ii_bend = btail; | |
14054 | + for (bindex = bstart; bindex <= btail; bindex++) { | |
14055 | + h_dentry = au_h_dptr(dentry, bindex); | |
14056 | + if (h_dentry) | |
14057 | + au_set_h_iptr(inode, bindex, | |
14058 | + au_igrab(h_dentry->d_inode), flags); | |
14059 | + } | |
14060 | + au_cpup_attr_all(inode, /*force*/1); | |
dece6358 | 14061 | + |
4f0767ce | 14062 | +out: |
4a4d8108 AM |
14063 | + return err; |
14064 | +} | |
dece6358 | 14065 | + |
027c5e7a AM |
14066 | +/* |
14067 | + * successful returns with iinfo write_locked | |
14068 | + * minus: errno | |
14069 | + * zero: success, matched | |
14070 | + * plus: no error, but unmatched | |
14071 | + */ | |
14072 | +static int reval_inode(struct inode *inode, struct dentry *dentry) | |
4a4d8108 AM |
14073 | +{ |
14074 | + int err; | |
14075 | + aufs_bindex_t bindex, bend; | |
14076 | + struct inode *h_inode, *h_dinode; | |
dece6358 | 14077 | + |
4a4d8108 AM |
14078 | + /* |
14079 | + * before this function, if aufs got any iinfo lock, it must be only | |
14080 | + * one, the parent dir. | |
14081 | + * it can happen by UDBA and the obsoleted inode number. | |
14082 | + */ | |
14083 | + err = -EIO; | |
14084 | + if (unlikely(inode->i_ino == parent_ino(dentry))) | |
14085 | + goto out; | |
14086 | + | |
027c5e7a | 14087 | + err = 1; |
4a4d8108 AM |
14088 | + ii_write_lock_new_child(inode); |
14089 | + h_dinode = au_h_dptr(dentry, au_dbstart(dentry))->d_inode; | |
14090 | + bend = au_ibend(inode); | |
14091 | + for (bindex = au_ibstart(inode); bindex <= bend; bindex++) { | |
14092 | + h_inode = au_h_iptr(inode, bindex); | |
14093 | + if (h_inode && h_inode == h_dinode) { | |
4a4d8108 | 14094 | + err = 0; |
027c5e7a | 14095 | + if (au_iigen_test(inode, au_digen(dentry))) |
4a4d8108 AM |
14096 | + err = au_refresh_hinode(inode, dentry); |
14097 | + break; | |
1308ab2a | 14098 | + } |
1facf9fc | 14099 | + } |
dece6358 | 14100 | + |
4a4d8108 AM |
14101 | + if (unlikely(err)) |
14102 | + ii_write_unlock(inode); | |
4f0767ce | 14103 | +out: |
1facf9fc | 14104 | + return err; |
14105 | +} | |
1facf9fc | 14106 | + |
4a4d8108 AM |
14107 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, |
14108 | + unsigned int d_type, ino_t *ino) | |
1facf9fc | 14109 | +{ |
4a4d8108 AM |
14110 | + int err; |
14111 | + struct mutex *mtx; | |
1facf9fc | 14112 | + |
b752ccd1 | 14113 | + /* prevent hardlinked inode number from race condition */ |
4a4d8108 | 14114 | + mtx = NULL; |
b752ccd1 | 14115 | + if (d_type != DT_DIR) { |
4a4d8108 AM |
14116 | + mtx = &au_sbr(sb, bindex)->br_xino.xi_nondir_mtx; |
14117 | + mutex_lock(mtx); | |
14118 | + } | |
14119 | + err = au_xino_read(sb, bindex, h_ino, ino); | |
14120 | + if (unlikely(err)) | |
14121 | + goto out; | |
1308ab2a | 14122 | + |
4a4d8108 AM |
14123 | + if (!*ino) { |
14124 | + err = -EIO; | |
14125 | + *ino = au_xino_new_ino(sb); | |
14126 | + if (unlikely(!*ino)) | |
1facf9fc | 14127 | + goto out; |
4a4d8108 AM |
14128 | + err = au_xino_write(sb, bindex, h_ino, *ino); |
14129 | + if (unlikely(err)) | |
1308ab2a | 14130 | + goto out; |
1308ab2a | 14131 | + } |
1facf9fc | 14132 | + |
4f0767ce | 14133 | +out: |
b752ccd1 | 14134 | + if (mtx) |
4a4d8108 | 14135 | + mutex_unlock(mtx); |
1facf9fc | 14136 | + return err; |
14137 | +} | |
14138 | + | |
4a4d8108 AM |
14139 | +/* successful returns with iinfo write_locked */ |
14140 | +/* todo: return with unlocked? */ | |
14141 | +struct inode *au_new_inode(struct dentry *dentry, int must_new) | |
1facf9fc | 14142 | +{ |
b752ccd1 | 14143 | + struct inode *inode, *h_inode; |
4a4d8108 AM |
14144 | + struct dentry *h_dentry; |
14145 | + struct super_block *sb; | |
b752ccd1 | 14146 | + struct mutex *mtx; |
4a4d8108 | 14147 | + ino_t h_ino, ino; |
027c5e7a | 14148 | + int err; |
4a4d8108 | 14149 | + aufs_bindex_t bstart; |
1facf9fc | 14150 | + |
4a4d8108 AM |
14151 | + sb = dentry->d_sb; |
14152 | + bstart = au_dbstart(dentry); | |
14153 | + h_dentry = au_h_dptr(dentry, bstart); | |
b752ccd1 AM |
14154 | + h_inode = h_dentry->d_inode; |
14155 | + h_ino = h_inode->i_ino; | |
14156 | + | |
14157 | + /* | |
14158 | + * stop 'race'-ing between hardlinks under different | |
14159 | + * parents. | |
14160 | + */ | |
14161 | + mtx = NULL; | |
14162 | + if (!S_ISDIR(h_inode->i_mode)) | |
14163 | + mtx = &au_sbr(sb, bstart)->br_xino.xi_nondir_mtx; | |
14164 | + | |
4f0767ce | 14165 | +new_ino: |
b752ccd1 AM |
14166 | + if (mtx) |
14167 | + mutex_lock(mtx); | |
4a4d8108 AM |
14168 | + err = au_xino_read(sb, bstart, h_ino, &ino); |
14169 | + inode = ERR_PTR(err); | |
14170 | + if (unlikely(err)) | |
14171 | + goto out; | |
b752ccd1 | 14172 | + |
4a4d8108 AM |
14173 | + if (!ino) { |
14174 | + ino = au_xino_new_ino(sb); | |
14175 | + if (unlikely(!ino)) { | |
14176 | + inode = ERR_PTR(-EIO); | |
dece6358 AM |
14177 | + goto out; |
14178 | + } | |
14179 | + } | |
1facf9fc | 14180 | + |
4a4d8108 AM |
14181 | + AuDbg("i%lu\n", (unsigned long)ino); |
14182 | + inode = au_iget_locked(sb, ino); | |
14183 | + err = PTR_ERR(inode); | |
14184 | + if (IS_ERR(inode)) | |
1facf9fc | 14185 | + goto out; |
1facf9fc | 14186 | + |
4a4d8108 AM |
14187 | + AuDbg("%lx, new %d\n", inode->i_state, !!(inode->i_state & I_NEW)); |
14188 | + if (inode->i_state & I_NEW) { | |
14189 | + ii_write_lock_new_child(inode); | |
14190 | + err = set_inode(inode, dentry); | |
14191 | + if (!err) { | |
14192 | + unlock_new_inode(inode); | |
14193 | + goto out; /* success */ | |
14194 | + } | |
1308ab2a | 14195 | + |
027c5e7a AM |
14196 | + /* |
14197 | + * iget_failed() calls iput(), but we need to call | |
14198 | + * ii_write_unlock() after iget_failed(). so dirty hack for | |
14199 | + * i_count. | |
14200 | + */ | |
14201 | + atomic_inc(&inode->i_count); | |
4a4d8108 | 14202 | + iget_failed(inode); |
027c5e7a AM |
14203 | + ii_write_unlock(inode); |
14204 | + au_xino_write(sb, bstart, h_ino, /*ino*/0); | |
14205 | + /* ignore this error */ | |
14206 | + goto out_iput; | |
14207 | + } else if (!must_new && !IS_DEADDIR(inode) && inode->i_nlink) { | |
b752ccd1 AM |
14208 | + /* |
14209 | + * horrible race condition between lookup, readdir and copyup | |
14210 | + * (or something). | |
14211 | + */ | |
14212 | + if (mtx) | |
14213 | + mutex_unlock(mtx); | |
027c5e7a AM |
14214 | + err = reval_inode(inode, dentry); |
14215 | + if (unlikely(err < 0)) { | |
14216 | + mtx = NULL; | |
14217 | + goto out_iput; | |
14218 | + } | |
14219 | + | |
b752ccd1 AM |
14220 | + if (!err) { |
14221 | + mtx = NULL; | |
4a4d8108 | 14222 | + goto out; /* success */ |
b752ccd1 AM |
14223 | + } else if (mtx) |
14224 | + mutex_lock(mtx); | |
4a4d8108 AM |
14225 | + } |
14226 | + | |
14227 | + if (unlikely(au_test_fs_unique_ino(h_dentry->d_inode))) | |
14228 | + AuWarn1("Warning: Un-notified UDBA or repeatedly renamed dir," | |
14229 | + " b%d, %s, %.*s, hi%lu, i%lu.\n", | |
14230 | + bstart, au_sbtype(h_dentry->d_sb), AuDLNPair(dentry), | |
14231 | + (unsigned long)h_ino, (unsigned long)ino); | |
14232 | + ino = 0; | |
14233 | + err = au_xino_write(sb, bstart, h_ino, /*ino*/0); | |
14234 | + if (!err) { | |
14235 | + iput(inode); | |
b752ccd1 AM |
14236 | + if (mtx) |
14237 | + mutex_unlock(mtx); | |
4a4d8108 AM |
14238 | + goto new_ino; |
14239 | + } | |
1308ab2a | 14240 | + |
4f0767ce | 14241 | +out_iput: |
4a4d8108 | 14242 | + iput(inode); |
4a4d8108 | 14243 | + inode = ERR_PTR(err); |
4f0767ce | 14244 | +out: |
b752ccd1 AM |
14245 | + if (mtx) |
14246 | + mutex_unlock(mtx); | |
4a4d8108 | 14247 | + return inode; |
1facf9fc | 14248 | +} |
14249 | + | |
4a4d8108 | 14250 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 14251 | + |
4a4d8108 AM |
14252 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, |
14253 | + struct inode *inode) | |
14254 | +{ | |
14255 | + int err; | |
1facf9fc | 14256 | + |
4a4d8108 | 14257 | + err = au_br_rdonly(au_sbr(sb, bindex)); |
1facf9fc | 14258 | + |
4a4d8108 AM |
14259 | + /* pseudo-link after flushed may happen out of bounds */ |
14260 | + if (!err | |
14261 | + && inode | |
14262 | + && au_ibstart(inode) <= bindex | |
14263 | + && bindex <= au_ibend(inode)) { | |
14264 | + /* | |
14265 | + * permission check is unnecessary since vfsub routine | |
14266 | + * will be called later | |
14267 | + */ | |
14268 | + struct inode *hi = au_h_iptr(inode, bindex); | |
14269 | + if (hi) | |
14270 | + err = IS_IMMUTABLE(hi) ? -EROFS : 0; | |
1facf9fc | 14271 | + } |
14272 | + | |
4a4d8108 AM |
14273 | + return err; |
14274 | +} | |
dece6358 | 14275 | + |
4a4d8108 AM |
14276 | +int au_test_h_perm(struct inode *h_inode, int mask) |
14277 | +{ | |
14278 | + if (!current_fsuid()) | |
14279 | + return 0; | |
14280 | + return inode_permission(h_inode, mask); | |
14281 | +} | |
1facf9fc | 14282 | + |
4a4d8108 AM |
14283 | +int au_test_h_perm_sio(struct inode *h_inode, int mask) |
14284 | +{ | |
14285 | + if (au_test_nfs(h_inode->i_sb) | |
14286 | + && (mask & MAY_WRITE) | |
14287 | + && S_ISDIR(h_inode->i_mode)) | |
14288 | + mask |= MAY_READ; /* force permission check */ | |
14289 | + return au_test_h_perm(h_inode, mask); | |
1facf9fc | 14290 | +} |
7f207e10 AM |
14291 | diff -urN /usr/share/empty/fs/aufs/inode.h linux/fs/aufs/inode.h |
14292 | --- /usr/share/empty/fs/aufs/inode.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
14293 | +++ linux/fs/aufs/inode.h 2011-08-24 13:30:24.734646739 +0200 |
14294 | @@ -0,0 +1,556 @@ | |
4a4d8108 | 14295 | +/* |
027c5e7a | 14296 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
14297 | + * |
14298 | + * This program, aufs is free software; you can redistribute it and/or modify | |
14299 | + * it under the terms of the GNU General Public License as published by | |
14300 | + * the Free Software Foundation; either version 2 of the License, or | |
14301 | + * (at your option) any later version. | |
14302 | + * | |
14303 | + * This program is distributed in the hope that it will be useful, | |
14304 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14305 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14306 | + * GNU General Public License for more details. | |
14307 | + * | |
14308 | + * You should have received a copy of the GNU General Public License | |
14309 | + * along with this program; if not, write to the Free Software | |
14310 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
14311 | + */ | |
1facf9fc | 14312 | + |
1308ab2a | 14313 | +/* |
4a4d8108 | 14314 | + * inode operations |
1308ab2a | 14315 | + */ |
dece6358 | 14316 | + |
4a4d8108 AM |
14317 | +#ifndef __AUFS_INODE_H__ |
14318 | +#define __AUFS_INODE_H__ | |
dece6358 | 14319 | + |
4a4d8108 | 14320 | +#ifdef __KERNEL__ |
1308ab2a | 14321 | + |
4a4d8108 AM |
14322 | +#include <linux/fs.h> |
14323 | +#include <linux/fsnotify.h> | |
14324 | +#include <linux/aufs_type.h> | |
14325 | +#include "rwsem.h" | |
1308ab2a | 14326 | + |
4a4d8108 | 14327 | +struct vfsmount; |
1facf9fc | 14328 | + |
4a4d8108 AM |
14329 | +struct au_hnotify { |
14330 | +#ifdef CONFIG_AUFS_HNOTIFY | |
14331 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
7f207e10 | 14332 | + /* never use fsnotify_add_vfsmount_mark() */ |
0c5527e5 | 14333 | + struct fsnotify_mark hn_mark; |
7f207e10 | 14334 | + int hn_mark_dead; |
4a4d8108 | 14335 | +#endif |
7f207e10 | 14336 | + struct inode *hn_aufs_inode; /* no get/put */ |
4a4d8108 AM |
14337 | +#endif |
14338 | +} ____cacheline_aligned_in_smp; | |
1facf9fc | 14339 | + |
4a4d8108 AM |
14340 | +struct au_hinode { |
14341 | + struct inode *hi_inode; | |
14342 | + aufs_bindex_t hi_id; | |
14343 | +#ifdef CONFIG_AUFS_HNOTIFY | |
14344 | + struct au_hnotify *hi_notify; | |
14345 | +#endif | |
dece6358 | 14346 | + |
4a4d8108 AM |
14347 | + /* reference to the copied-up whiteout with get/put */ |
14348 | + struct dentry *hi_whdentry; | |
14349 | +}; | |
dece6358 | 14350 | + |
4a4d8108 AM |
14351 | +struct au_vdir; |
14352 | +struct au_iinfo { | |
14353 | + atomic_t ii_generation; | |
14354 | + struct super_block *ii_hsb1; /* no get/put */ | |
1facf9fc | 14355 | + |
4a4d8108 AM |
14356 | + struct au_rwsem ii_rwsem; |
14357 | + aufs_bindex_t ii_bstart, ii_bend; | |
14358 | + __u32 ii_higen; | |
14359 | + struct au_hinode *ii_hinode; | |
14360 | + struct au_vdir *ii_vdir; | |
14361 | +}; | |
1facf9fc | 14362 | + |
4a4d8108 AM |
14363 | +struct au_icntnr { |
14364 | + struct au_iinfo iinfo; | |
14365 | + struct inode vfs_inode; | |
14366 | +} ____cacheline_aligned_in_smp; | |
1308ab2a | 14367 | + |
4a4d8108 AM |
14368 | +/* au_pin flags */ |
14369 | +#define AuPin_DI_LOCKED 1 | |
14370 | +#define AuPin_MNT_WRITE (1 << 1) | |
14371 | +#define au_ftest_pin(flags, name) ((flags) & AuPin_##name) | |
7f207e10 AM |
14372 | +#define au_fset_pin(flags, name) \ |
14373 | + do { (flags) |= AuPin_##name; } while (0) | |
14374 | +#define au_fclr_pin(flags, name) \ | |
14375 | + do { (flags) &= ~AuPin_##name; } while (0) | |
4a4d8108 AM |
14376 | + |
14377 | +struct au_pin { | |
14378 | + /* input */ | |
14379 | + struct dentry *dentry; | |
14380 | + unsigned int udba; | |
14381 | + unsigned char lsc_di, lsc_hi, flags; | |
14382 | + aufs_bindex_t bindex; | |
14383 | + | |
14384 | + /* output */ | |
14385 | + struct dentry *parent; | |
14386 | + struct au_hinode *hdir; | |
14387 | + struct vfsmount *h_mnt; | |
14388 | +}; | |
1facf9fc | 14389 | + |
1308ab2a | 14390 | +/* ---------------------------------------------------------------------- */ |
14391 | + | |
4a4d8108 | 14392 | +static inline struct au_iinfo *au_ii(struct inode *inode) |
1facf9fc | 14393 | +{ |
4a4d8108 | 14394 | + struct au_iinfo *iinfo; |
1facf9fc | 14395 | + |
4a4d8108 AM |
14396 | + iinfo = &(container_of(inode, struct au_icntnr, vfs_inode)->iinfo); |
14397 | + if (iinfo->ii_hinode) | |
14398 | + return iinfo; | |
14399 | + return NULL; /* debugging bad_inode case */ | |
14400 | +} | |
1facf9fc | 14401 | + |
4a4d8108 | 14402 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 14403 | + |
4a4d8108 AM |
14404 | +/* inode.c */ |
14405 | +struct inode *au_igrab(struct inode *inode); | |
027c5e7a | 14406 | +int au_refresh_hinode_self(struct inode *inode); |
4a4d8108 AM |
14407 | +int au_refresh_hinode(struct inode *inode, struct dentry *dentry); |
14408 | +int au_ino(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
14409 | + unsigned int d_type, ino_t *ino); | |
14410 | +struct inode *au_new_inode(struct dentry *dentry, int must_new); | |
14411 | +int au_test_ro(struct super_block *sb, aufs_bindex_t bindex, | |
14412 | + struct inode *inode); | |
14413 | +int au_test_h_perm(struct inode *h_inode, int mask); | |
14414 | +int au_test_h_perm_sio(struct inode *h_inode, int mask); | |
1facf9fc | 14415 | + |
4a4d8108 AM |
14416 | +static inline int au_wh_ino(struct super_block *sb, aufs_bindex_t bindex, |
14417 | + ino_t h_ino, unsigned int d_type, ino_t *ino) | |
14418 | +{ | |
14419 | +#ifdef CONFIG_AUFS_SHWH | |
14420 | + return au_ino(sb, bindex, h_ino, d_type, ino); | |
14421 | +#else | |
14422 | + return 0; | |
14423 | +#endif | |
14424 | +} | |
1facf9fc | 14425 | + |
4a4d8108 AM |
14426 | +/* i_op.c */ |
14427 | +extern struct inode_operations aufs_iop, aufs_symlink_iop, aufs_dir_iop; | |
1308ab2a | 14428 | + |
4a4d8108 AM |
14429 | +/* au_wr_dir flags */ |
14430 | +#define AuWrDir_ADD_ENTRY 1 | |
14431 | +#define AuWrDir_ISDIR (1 << 1) | |
14432 | +#define au_ftest_wrdir(flags, name) ((flags) & AuWrDir_##name) | |
7f207e10 AM |
14433 | +#define au_fset_wrdir(flags, name) \ |
14434 | + do { (flags) |= AuWrDir_##name; } while (0) | |
14435 | +#define au_fclr_wrdir(flags, name) \ | |
14436 | + do { (flags) &= ~AuWrDir_##name; } while (0) | |
1facf9fc | 14437 | + |
4a4d8108 AM |
14438 | +struct au_wr_dir_args { |
14439 | + aufs_bindex_t force_btgt; | |
14440 | + unsigned char flags; | |
14441 | +}; | |
14442 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
14443 | + struct au_wr_dir_args *args); | |
dece6358 | 14444 | + |
4a4d8108 AM |
14445 | +struct dentry *au_pinned_h_parent(struct au_pin *pin); |
14446 | +void au_pin_init(struct au_pin *pin, struct dentry *dentry, | |
14447 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
14448 | + unsigned int udba, unsigned char flags); | |
14449 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
14450 | + unsigned int udba, unsigned char flags) __must_check; | |
14451 | +int au_do_pin(struct au_pin *pin) __must_check; | |
14452 | +void au_unpin(struct au_pin *pin); | |
1facf9fc | 14453 | + |
4a4d8108 AM |
14454 | +/* i_op_add.c */ |
14455 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
14456 | + struct dentry *h_parent, int isdir); | |
14457 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev); | |
14458 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname); | |
14459 | +int aufs_create(struct inode *dir, struct dentry *dentry, int mode, | |
14460 | + struct nameidata *nd); | |
14461 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
14462 | + struct dentry *dentry); | |
14463 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode); | |
1facf9fc | 14464 | + |
4a4d8108 AM |
14465 | +/* i_op_del.c */ |
14466 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup); | |
14467 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
14468 | + struct dentry *h_parent, int isdir); | |
14469 | +int aufs_unlink(struct inode *dir, struct dentry *dentry); | |
14470 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry); | |
1308ab2a | 14471 | + |
4a4d8108 AM |
14472 | +/* i_op_ren.c */ |
14473 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt); | |
14474 | +int aufs_rename(struct inode *src_dir, struct dentry *src_dentry, | |
14475 | + struct inode *dir, struct dentry *dentry); | |
1facf9fc | 14476 | + |
4a4d8108 AM |
14477 | +/* iinfo.c */ |
14478 | +struct inode *au_h_iptr(struct inode *inode, aufs_bindex_t bindex); | |
14479 | +void au_hiput(struct au_hinode *hinode); | |
14480 | +void au_set_hi_wh(struct inode *inode, aufs_bindex_t bindex, | |
14481 | + struct dentry *h_wh); | |
14482 | +unsigned int au_hi_flags(struct inode *inode, int isdir); | |
1308ab2a | 14483 | + |
4a4d8108 AM |
14484 | +/* hinode flags */ |
14485 | +#define AuHi_XINO 1 | |
14486 | +#define AuHi_HNOTIFY (1 << 1) | |
14487 | +#define au_ftest_hi(flags, name) ((flags) & AuHi_##name) | |
7f207e10 AM |
14488 | +#define au_fset_hi(flags, name) \ |
14489 | + do { (flags) |= AuHi_##name; } while (0) | |
14490 | +#define au_fclr_hi(flags, name) \ | |
14491 | + do { (flags) &= ~AuHi_##name; } while (0) | |
1facf9fc | 14492 | + |
4a4d8108 AM |
14493 | +#ifndef CONFIG_AUFS_HNOTIFY |
14494 | +#undef AuHi_HNOTIFY | |
14495 | +#define AuHi_HNOTIFY 0 | |
14496 | +#endif | |
1facf9fc | 14497 | + |
4a4d8108 AM |
14498 | +void au_set_h_iptr(struct inode *inode, aufs_bindex_t bindex, |
14499 | + struct inode *h_inode, unsigned int flags); | |
1facf9fc | 14500 | + |
4a4d8108 AM |
14501 | +void au_update_iigen(struct inode *inode); |
14502 | +void au_update_ibrange(struct inode *inode, int do_put_zero); | |
1facf9fc | 14503 | + |
4a4d8108 AM |
14504 | +void au_icntnr_init_once(void *_c); |
14505 | +int au_iinfo_init(struct inode *inode); | |
14506 | +void au_iinfo_fin(struct inode *inode); | |
14507 | +int au_ii_realloc(struct au_iinfo *iinfo, int nbr); | |
1308ab2a | 14508 | + |
e49829fe | 14509 | +#ifdef CONFIG_PROC_FS |
4a4d8108 | 14510 | +/* plink.c */ |
e49829fe JR |
14511 | +int au_plink_maint(struct super_block *sb, int flags); |
14512 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo); | |
14513 | +int au_plink_maint_enter(struct super_block *sb); | |
4a4d8108 AM |
14514 | +#ifdef CONFIG_AUFS_DEBUG |
14515 | +void au_plink_list(struct super_block *sb); | |
14516 | +#else | |
14517 | +AuStubVoid(au_plink_list, struct super_block *sb) | |
14518 | +#endif | |
14519 | +int au_plink_test(struct inode *inode); | |
14520 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex); | |
14521 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
14522 | + struct dentry *h_dentry); | |
e49829fe JR |
14523 | +void au_plink_put(struct super_block *sb, int verbose); |
14524 | +void au_plink_clean(struct super_block *sb, int verbose); | |
4a4d8108 | 14525 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id); |
e49829fe JR |
14526 | +#else |
14527 | +AuStubInt0(au_plink_maint, struct super_block *sb, int flags); | |
14528 | +AuStubVoid(au_plink_maint_leave, struct au_sbinfo *sbinfo); | |
14529 | +AuStubInt0(au_plink_maint_enter, struct super_block *sb); | |
14530 | +AuStubVoid(au_plink_list, struct super_block *sb); | |
14531 | +AuStubInt0(au_plink_test, struct inode *inode); | |
14532 | +AuStub(struct dentry *, au_plink_lkup, return NULL, | |
14533 | + struct inode *inode, aufs_bindex_t bindex); | |
14534 | +AuStubVoid(au_plink_append, struct inode *inode, aufs_bindex_t bindex, | |
14535 | + struct dentry *h_dentry); | |
14536 | +AuStubVoid(au_plink_put, struct super_block *sb, int verbose); | |
14537 | +AuStubVoid(au_plink_clean, struct super_block *sb, int verbose); | |
14538 | +AuStubVoid(au_plink_half_refresh, struct super_block *sb, aufs_bindex_t br_id); | |
14539 | +#endif /* CONFIG_PROC_FS */ | |
1facf9fc | 14540 | + |
4a4d8108 | 14541 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 14542 | + |
4a4d8108 AM |
14543 | +/* lock subclass for iinfo */ |
14544 | +enum { | |
14545 | + AuLsc_II_CHILD, /* child first */ | |
14546 | + AuLsc_II_CHILD2, /* rename(2), link(2), and cpup at hnotify */ | |
14547 | + AuLsc_II_CHILD3, /* copyup dirs */ | |
14548 | + AuLsc_II_PARENT, /* see AuLsc_I_PARENT in vfsub.h */ | |
14549 | + AuLsc_II_PARENT2, | |
14550 | + AuLsc_II_PARENT3, /* copyup dirs */ | |
14551 | + AuLsc_II_NEW_CHILD | |
14552 | +}; | |
1308ab2a | 14553 | + |
1facf9fc | 14554 | +/* |
4a4d8108 AM |
14555 | + * ii_read_lock_child, ii_write_lock_child, |
14556 | + * ii_read_lock_child2, ii_write_lock_child2, | |
14557 | + * ii_read_lock_child3, ii_write_lock_child3, | |
14558 | + * ii_read_lock_parent, ii_write_lock_parent, | |
14559 | + * ii_read_lock_parent2, ii_write_lock_parent2, | |
14560 | + * ii_read_lock_parent3, ii_write_lock_parent3, | |
14561 | + * ii_read_lock_new_child, ii_write_lock_new_child, | |
1facf9fc | 14562 | + */ |
4a4d8108 AM |
14563 | +#define AuReadLockFunc(name, lsc) \ |
14564 | +static inline void ii_read_lock_##name(struct inode *i) \ | |
14565 | +{ \ | |
14566 | + au_rw_read_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
14567 | +} | |
14568 | + | |
14569 | +#define AuWriteLockFunc(name, lsc) \ | |
14570 | +static inline void ii_write_lock_##name(struct inode *i) \ | |
14571 | +{ \ | |
14572 | + au_rw_write_lock_nested(&au_ii(i)->ii_rwsem, AuLsc_II_##lsc); \ | |
14573 | +} | |
14574 | + | |
14575 | +#define AuRWLockFuncs(name, lsc) \ | |
14576 | + AuReadLockFunc(name, lsc) \ | |
14577 | + AuWriteLockFunc(name, lsc) | |
14578 | + | |
14579 | +AuRWLockFuncs(child, CHILD); | |
14580 | +AuRWLockFuncs(child2, CHILD2); | |
14581 | +AuRWLockFuncs(child3, CHILD3); | |
14582 | +AuRWLockFuncs(parent, PARENT); | |
14583 | +AuRWLockFuncs(parent2, PARENT2); | |
14584 | +AuRWLockFuncs(parent3, PARENT3); | |
14585 | +AuRWLockFuncs(new_child, NEW_CHILD); | |
14586 | + | |
14587 | +#undef AuReadLockFunc | |
14588 | +#undef AuWriteLockFunc | |
14589 | +#undef AuRWLockFuncs | |
1facf9fc | 14590 | + |
14591 | +/* | |
4a4d8108 | 14592 | + * ii_read_unlock, ii_write_unlock, ii_downgrade_lock |
1facf9fc | 14593 | + */ |
4a4d8108 | 14594 | +AuSimpleUnlockRwsemFuncs(ii, struct inode *i, &au_ii(i)->ii_rwsem); |
1facf9fc | 14595 | + |
4a4d8108 AM |
14596 | +#define IiMustNoWaiters(i) AuRwMustNoWaiters(&au_ii(i)->ii_rwsem) |
14597 | +#define IiMustAnyLock(i) AuRwMustAnyLock(&au_ii(i)->ii_rwsem) | |
14598 | +#define IiMustWriteLock(i) AuRwMustWriteLock(&au_ii(i)->ii_rwsem) | |
1facf9fc | 14599 | + |
4a4d8108 | 14600 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 14601 | + |
027c5e7a AM |
14602 | +static inline void au_icntnr_init(struct au_icntnr *c) |
14603 | +{ | |
14604 | +#ifdef CONFIG_AUFS_DEBUG | |
14605 | + c->vfs_inode.i_mode = 0; | |
14606 | +#endif | |
14607 | +} | |
14608 | + | |
4a4d8108 AM |
14609 | +static inline unsigned int au_iigen(struct inode *inode) |
14610 | +{ | |
14611 | + return atomic_read(&au_ii(inode)->ii_generation); | |
14612 | +} | |
1308ab2a | 14613 | + |
4a4d8108 AM |
14614 | +/* tiny test for inode number */ |
14615 | +/* tmpfs generation is too rough */ | |
14616 | +static inline int au_test_higen(struct inode *inode, struct inode *h_inode) | |
14617 | +{ | |
14618 | + struct au_iinfo *iinfo; | |
1308ab2a | 14619 | + |
4a4d8108 AM |
14620 | + iinfo = au_ii(inode); |
14621 | + AuRwMustAnyLock(&iinfo->ii_rwsem); | |
14622 | + return !(iinfo->ii_hsb1 == h_inode->i_sb | |
14623 | + && iinfo->ii_higen == h_inode->i_generation); | |
14624 | +} | |
1308ab2a | 14625 | + |
4a4d8108 AM |
14626 | +static inline void au_iigen_dec(struct inode *inode) |
14627 | +{ | |
e49829fe | 14628 | + atomic_dec(&au_ii(inode)->ii_generation); |
027c5e7a AM |
14629 | +} |
14630 | + | |
14631 | +static inline int au_iigen_test(struct inode *inode, unsigned int sigen) | |
14632 | +{ | |
14633 | + int err; | |
14634 | + | |
14635 | + err = 0; | |
14636 | + if (unlikely(inode && au_iigen(inode) != sigen)) | |
14637 | + err = -EIO; | |
14638 | + | |
14639 | + return err; | |
4a4d8108 | 14640 | +} |
1308ab2a | 14641 | + |
4a4d8108 | 14642 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 14643 | + |
4a4d8108 AM |
14644 | +static inline aufs_bindex_t au_ii_br_id(struct inode *inode, |
14645 | + aufs_bindex_t bindex) | |
14646 | +{ | |
14647 | + IiMustAnyLock(inode); | |
14648 | + return au_ii(inode)->ii_hinode[0 + bindex].hi_id; | |
14649 | +} | |
1308ab2a | 14650 | + |
4a4d8108 AM |
14651 | +static inline aufs_bindex_t au_ibstart(struct inode *inode) |
14652 | +{ | |
14653 | + IiMustAnyLock(inode); | |
14654 | + return au_ii(inode)->ii_bstart; | |
14655 | +} | |
1308ab2a | 14656 | + |
4a4d8108 AM |
14657 | +static inline aufs_bindex_t au_ibend(struct inode *inode) |
14658 | +{ | |
14659 | + IiMustAnyLock(inode); | |
14660 | + return au_ii(inode)->ii_bend; | |
14661 | +} | |
1308ab2a | 14662 | + |
4a4d8108 AM |
14663 | +static inline struct au_vdir *au_ivdir(struct inode *inode) |
14664 | +{ | |
14665 | + IiMustAnyLock(inode); | |
14666 | + return au_ii(inode)->ii_vdir; | |
14667 | +} | |
1308ab2a | 14668 | + |
4a4d8108 AM |
14669 | +static inline struct dentry *au_hi_wh(struct inode *inode, aufs_bindex_t bindex) |
14670 | +{ | |
14671 | + IiMustAnyLock(inode); | |
14672 | + return au_ii(inode)->ii_hinode[0 + bindex].hi_whdentry; | |
14673 | +} | |
1308ab2a | 14674 | + |
4a4d8108 | 14675 | +static inline void au_set_ibstart(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 14676 | +{ |
4a4d8108 AM |
14677 | + IiMustWriteLock(inode); |
14678 | + au_ii(inode)->ii_bstart = bindex; | |
14679 | +} | |
1308ab2a | 14680 | + |
4a4d8108 AM |
14681 | +static inline void au_set_ibend(struct inode *inode, aufs_bindex_t bindex) |
14682 | +{ | |
14683 | + IiMustWriteLock(inode); | |
14684 | + au_ii(inode)->ii_bend = bindex; | |
1308ab2a | 14685 | +} |
14686 | + | |
4a4d8108 AM |
14687 | +static inline void au_set_ivdir(struct inode *inode, struct au_vdir *vdir) |
14688 | +{ | |
14689 | + IiMustWriteLock(inode); | |
14690 | + au_ii(inode)->ii_vdir = vdir; | |
14691 | +} | |
1facf9fc | 14692 | + |
4a4d8108 | 14693 | +static inline struct au_hinode *au_hi(struct inode *inode, aufs_bindex_t bindex) |
1308ab2a | 14694 | +{ |
4a4d8108 AM |
14695 | + IiMustAnyLock(inode); |
14696 | + return au_ii(inode)->ii_hinode + bindex; | |
14697 | +} | |
dece6358 | 14698 | + |
4a4d8108 | 14699 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 14700 | + |
4a4d8108 AM |
14701 | +static inline struct dentry *au_pinned_parent(struct au_pin *pin) |
14702 | +{ | |
14703 | + if (pin) | |
14704 | + return pin->parent; | |
14705 | + return NULL; | |
1facf9fc | 14706 | +} |
14707 | + | |
4a4d8108 | 14708 | +static inline struct inode *au_pinned_h_dir(struct au_pin *pin) |
1facf9fc | 14709 | +{ |
4a4d8108 AM |
14710 | + if (pin && pin->hdir) |
14711 | + return pin->hdir->hi_inode; | |
14712 | + return NULL; | |
1308ab2a | 14713 | +} |
1facf9fc | 14714 | + |
4a4d8108 AM |
14715 | +static inline struct au_hinode *au_pinned_hdir(struct au_pin *pin) |
14716 | +{ | |
14717 | + if (pin) | |
14718 | + return pin->hdir; | |
14719 | + return NULL; | |
14720 | +} | |
1facf9fc | 14721 | + |
4a4d8108 | 14722 | +static inline void au_pin_set_dentry(struct au_pin *pin, struct dentry *dentry) |
1308ab2a | 14723 | +{ |
4a4d8108 AM |
14724 | + if (pin) |
14725 | + pin->dentry = dentry; | |
14726 | +} | |
1308ab2a | 14727 | + |
4a4d8108 AM |
14728 | +static inline void au_pin_set_parent_lflag(struct au_pin *pin, |
14729 | + unsigned char lflag) | |
14730 | +{ | |
14731 | + if (pin) { | |
7f207e10 | 14732 | + if (lflag) |
4a4d8108 | 14733 | + au_fset_pin(pin->flags, DI_LOCKED); |
7f207e10 | 14734 | + else |
4a4d8108 | 14735 | + au_fclr_pin(pin->flags, DI_LOCKED); |
1308ab2a | 14736 | + } |
4a4d8108 AM |
14737 | +} |
14738 | + | |
14739 | +static inline void au_pin_set_parent(struct au_pin *pin, struct dentry *parent) | |
14740 | +{ | |
14741 | + if (pin) { | |
14742 | + dput(pin->parent); | |
14743 | + pin->parent = dget(parent); | |
1facf9fc | 14744 | + } |
4a4d8108 | 14745 | +} |
1facf9fc | 14746 | + |
4a4d8108 AM |
14747 | +/* ---------------------------------------------------------------------- */ |
14748 | + | |
027c5e7a | 14749 | +struct au_branch; |
4a4d8108 AM |
14750 | +#ifdef CONFIG_AUFS_HNOTIFY |
14751 | +struct au_hnotify_op { | |
14752 | + void (*ctl)(struct au_hinode *hinode, int do_set); | |
027c5e7a AM |
14753 | + int (*alloc)(struct au_hinode *hinode); |
14754 | + void (*free)(struct au_hinode *hinode); | |
4a4d8108 AM |
14755 | + |
14756 | + void (*fin)(void); | |
14757 | + int (*init)(void); | |
027c5e7a AM |
14758 | + |
14759 | + int (*reset_br)(unsigned int udba, struct au_branch *br, int perm); | |
14760 | + void (*fin_br)(struct au_branch *br); | |
14761 | + int (*init_br)(struct au_branch *br, int perm); | |
4a4d8108 AM |
14762 | +}; |
14763 | + | |
14764 | +/* hnotify.c */ | |
027c5e7a | 14765 | +int au_hn_alloc(struct au_hinode *hinode, struct inode *inode); |
4a4d8108 AM |
14766 | +void au_hn_free(struct au_hinode *hinode); |
14767 | +void au_hn_ctl(struct au_hinode *hinode, int do_set); | |
14768 | +void au_hn_reset(struct inode *inode, unsigned int flags); | |
14769 | +int au_hnotify(struct inode *h_dir, struct au_hnotify *hnotify, u32 mask, | |
14770 | + struct qstr *h_child_qstr, struct inode *h_child_inode); | |
027c5e7a AM |
14771 | +int au_hnotify_reset_br(unsigned int udba, struct au_branch *br, int perm); |
14772 | +int au_hnotify_init_br(struct au_branch *br, int perm); | |
14773 | +void au_hnotify_fin_br(struct au_branch *br); | |
4a4d8108 AM |
14774 | +int __init au_hnotify_init(void); |
14775 | +void au_hnotify_fin(void); | |
14776 | + | |
7f207e10 | 14777 | +/* hfsnotify.c */ |
4a4d8108 AM |
14778 | +extern const struct au_hnotify_op au_hnotify_op; |
14779 | + | |
14780 | +static inline | |
14781 | +void au_hn_init(struct au_hinode *hinode) | |
14782 | +{ | |
14783 | + hinode->hi_notify = NULL; | |
1308ab2a | 14784 | +} |
14785 | + | |
53392da6 AM |
14786 | +static inline struct au_hnotify *au_hn(struct au_hinode *hinode) |
14787 | +{ | |
14788 | + return hinode->hi_notify; | |
14789 | +} | |
14790 | + | |
4a4d8108 AM |
14791 | +#else |
14792 | +static inline | |
14793 | +int au_hn_alloc(struct au_hinode *hinode __maybe_unused, | |
027c5e7a | 14794 | + struct inode *inode __maybe_unused) |
1308ab2a | 14795 | +{ |
4a4d8108 AM |
14796 | + return -EOPNOTSUPP; |
14797 | +} | |
1308ab2a | 14798 | + |
53392da6 AM |
14799 | +static inline struct au_hnotify *au_hn(struct au_hinode *hinode) |
14800 | +{ | |
14801 | + return NULL; | |
14802 | +} | |
14803 | + | |
4a4d8108 AM |
14804 | +AuStubVoid(au_hn_free, struct au_hinode *hinode __maybe_unused) |
14805 | +AuStubVoid(au_hn_ctl, struct au_hinode *hinode __maybe_unused, | |
14806 | + int do_set __maybe_unused) | |
14807 | +AuStubVoid(au_hn_reset, struct inode *inode __maybe_unused, | |
14808 | + unsigned int flags __maybe_unused) | |
027c5e7a AM |
14809 | +AuStubInt0(au_hnotify_reset_br, unsigned int udba __maybe_unused, |
14810 | + struct au_branch *br __maybe_unused, | |
14811 | + int perm __maybe_unused) | |
14812 | +AuStubInt0(au_hnotify_init_br, struct au_branch *br __maybe_unused, | |
14813 | + int perm __maybe_unused) | |
14814 | +AuStubVoid(au_hnotify_fin_br, struct au_branch *br __maybe_unused) | |
4a4d8108 AM |
14815 | +AuStubInt0(__init au_hnotify_init, void) |
14816 | +AuStubVoid(au_hnotify_fin, void) | |
14817 | +AuStubVoid(au_hn_init, struct au_hinode *hinode __maybe_unused) | |
14818 | +#endif /* CONFIG_AUFS_HNOTIFY */ | |
14819 | + | |
14820 | +static inline void au_hn_suspend(struct au_hinode *hdir) | |
14821 | +{ | |
14822 | + au_hn_ctl(hdir, /*do_set*/0); | |
1308ab2a | 14823 | +} |
14824 | + | |
4a4d8108 | 14825 | +static inline void au_hn_resume(struct au_hinode *hdir) |
1308ab2a | 14826 | +{ |
4a4d8108 AM |
14827 | + au_hn_ctl(hdir, /*do_set*/1); |
14828 | +} | |
1308ab2a | 14829 | + |
4a4d8108 AM |
14830 | +static inline void au_hn_imtx_lock(struct au_hinode *hdir) |
14831 | +{ | |
14832 | + mutex_lock(&hdir->hi_inode->i_mutex); | |
14833 | + au_hn_suspend(hdir); | |
14834 | +} | |
dece6358 | 14835 | + |
4a4d8108 AM |
14836 | +static inline void au_hn_imtx_lock_nested(struct au_hinode *hdir, |
14837 | + unsigned int sc __maybe_unused) | |
14838 | +{ | |
14839 | + mutex_lock_nested(&hdir->hi_inode->i_mutex, sc); | |
14840 | + au_hn_suspend(hdir); | |
1facf9fc | 14841 | +} |
1facf9fc | 14842 | + |
4a4d8108 AM |
14843 | +static inline void au_hn_imtx_unlock(struct au_hinode *hdir) |
14844 | +{ | |
14845 | + au_hn_resume(hdir); | |
14846 | + mutex_unlock(&hdir->hi_inode->i_mutex); | |
14847 | +} | |
14848 | + | |
14849 | +#endif /* __KERNEL__ */ | |
14850 | +#endif /* __AUFS_INODE_H__ */ | |
7f207e10 AM |
14851 | diff -urN /usr/share/empty/fs/aufs/ioctl.c linux/fs/aufs/ioctl.c |
14852 | --- /usr/share/empty/fs/aufs/ioctl.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 14853 | +++ linux/fs/aufs/ioctl.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 14854 | @@ -0,0 +1,158 @@ |
4a4d8108 | 14855 | +/* |
027c5e7a | 14856 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
14857 | + * |
14858 | + * This program, aufs is free software; you can redistribute it and/or modify | |
14859 | + * it under the terms of the GNU General Public License as published by | |
14860 | + * the Free Software Foundation; either version 2 of the License, or | |
14861 | + * (at your option) any later version. | |
14862 | + * | |
14863 | + * This program is distributed in the hope that it will be useful, | |
14864 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
14865 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14866 | + * GNU General Public License for more details. | |
14867 | + * | |
14868 | + * You should have received a copy of the GNU General Public License | |
14869 | + * along with this program; if not, write to the Free Software | |
14870 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
14871 | + */ | |
14872 | + | |
14873 | +/* | |
14874 | + * ioctl | |
14875 | + * plink-management and readdir in userspace. | |
14876 | + * assist the pathconf(3) wrapper library. | |
14877 | + */ | |
14878 | + | |
14879 | +#include <linux/file.h> | |
14880 | +#include "aufs.h" | |
14881 | + | |
14882 | +static int au_wbr_fd(struct path *path) | |
14883 | +{ | |
14884 | + int err, fd; | |
14885 | + aufs_bindex_t wbi, bindex, bend; | |
14886 | + struct file *h_file; | |
14887 | + struct super_block *sb; | |
14888 | + struct dentry *root; | |
14889 | + struct au_branch *wbr; | |
14890 | + | |
14891 | + err = get_unused_fd(); | |
14892 | + if (unlikely(err < 0)) | |
14893 | + goto out; | |
14894 | + fd = err; | |
14895 | + | |
14896 | + wbi = 0; | |
14897 | + sb = path->dentry->d_sb; | |
14898 | + root = sb->s_root; | |
14899 | + aufs_read_lock(root, AuLock_IR); | |
14900 | + wbr = au_sbr(sb, wbi); | |
14901 | + if (!(path->mnt->mnt_flags & MNT_READONLY) | |
14902 | + && !au_br_writable(wbr->br_perm)) { | |
14903 | + bend = au_sbend(sb); | |
14904 | + for (bindex = 1; bindex <= bend; bindex++) { | |
14905 | + wbr = au_sbr(sb, bindex); | |
14906 | + if (au_br_writable(wbr->br_perm)) { | |
14907 | + wbi = bindex; | |
14908 | + break; | |
14909 | + } | |
14910 | + } | |
14911 | + wbr = au_sbr(sb, wbi); | |
14912 | + } | |
14913 | + AuDbg("wbi %d\n", wbi); | |
14914 | + h_file = au_h_open(root, wbi, O_RDONLY | O_DIRECTORY | O_LARGEFILE, | |
14915 | + NULL); | |
14916 | + aufs_read_unlock(root, AuLock_IR); | |
14917 | + err = PTR_ERR(h_file); | |
14918 | + if (IS_ERR(h_file)) | |
14919 | + goto out_fd; | |
14920 | + | |
14921 | + atomic_dec(&wbr->br_count); /* cf. au_h_open() */ | |
14922 | + fd_install(fd, h_file); | |
14923 | + err = fd; | |
14924 | + goto out; /* success */ | |
14925 | + | |
4f0767ce | 14926 | +out_fd: |
4a4d8108 | 14927 | + put_unused_fd(fd); |
4f0767ce | 14928 | +out: |
4a4d8108 AM |
14929 | + return err; |
14930 | +} | |
14931 | + | |
14932 | +/* ---------------------------------------------------------------------- */ | |
14933 | + | |
14934 | +long aufs_ioctl_dir(struct file *file, unsigned int cmd, unsigned long arg) | |
14935 | +{ | |
14936 | + long err; | |
14937 | + | |
14938 | + switch (cmd) { | |
4a4d8108 AM |
14939 | + case AUFS_CTL_RDU: |
14940 | + case AUFS_CTL_RDU_INO: | |
14941 | + err = au_rdu_ioctl(file, cmd, arg); | |
14942 | + break; | |
14943 | + | |
14944 | + case AUFS_CTL_WBR_FD: | |
14945 | + err = au_wbr_fd(&file->f_path); | |
14946 | + break; | |
14947 | + | |
027c5e7a AM |
14948 | + case AUFS_CTL_IBUSY: |
14949 | + err = au_ibusy_ioctl(file, arg); | |
14950 | + break; | |
14951 | + | |
4a4d8108 AM |
14952 | + default: |
14953 | + /* do not call the lower */ | |
14954 | + AuDbg("0x%x\n", cmd); | |
14955 | + err = -ENOTTY; | |
14956 | + } | |
14957 | + | |
14958 | + AuTraceErr(err); | |
14959 | + return err; | |
14960 | +} | |
14961 | + | |
14962 | +long aufs_ioctl_nondir(struct file *file, unsigned int cmd, unsigned long arg) | |
14963 | +{ | |
14964 | + long err; | |
14965 | + | |
14966 | + switch (cmd) { | |
14967 | + case AUFS_CTL_WBR_FD: | |
14968 | + err = au_wbr_fd(&file->f_path); | |
14969 | + break; | |
14970 | + | |
14971 | + default: | |
14972 | + /* do not call the lower */ | |
14973 | + AuDbg("0x%x\n", cmd); | |
14974 | + err = -ENOTTY; | |
14975 | + } | |
14976 | + | |
14977 | + AuTraceErr(err); | |
14978 | + return err; | |
14979 | +} | |
b752ccd1 AM |
14980 | + |
14981 | +#ifdef CONFIG_COMPAT | |
14982 | +long aufs_compat_ioctl_dir(struct file *file, unsigned int cmd, | |
14983 | + unsigned long arg) | |
14984 | +{ | |
14985 | + long err; | |
14986 | + | |
14987 | + switch (cmd) { | |
14988 | + case AUFS_CTL_RDU: | |
14989 | + case AUFS_CTL_RDU_INO: | |
14990 | + err = au_rdu_compat_ioctl(file, cmd, arg); | |
14991 | + break; | |
14992 | + | |
027c5e7a AM |
14993 | + case AUFS_CTL_IBUSY: |
14994 | + err = au_ibusy_compat_ioctl(file, arg); | |
14995 | + break; | |
14996 | + | |
b752ccd1 AM |
14997 | + default: |
14998 | + err = aufs_ioctl_dir(file, cmd, arg); | |
14999 | + } | |
15000 | + | |
15001 | + AuTraceErr(err); | |
15002 | + return err; | |
15003 | +} | |
15004 | + | |
15005 | +#if 0 /* unused yet */ | |
15006 | +long aufs_compat_ioctl_nondir(struct file *file, unsigned int cmd, | |
15007 | + unsigned long arg) | |
15008 | +{ | |
15009 | + return aufs_ioctl_nondir(file, cmd, (unsigned long)compat_ptr(arg)); | |
15010 | +} | |
15011 | +#endif | |
15012 | +#endif | |
7f207e10 AM |
15013 | diff -urN /usr/share/empty/fs/aufs/i_op_add.c linux/fs/aufs/i_op_add.c |
15014 | --- /usr/share/empty/fs/aufs/i_op_add.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 15015 | +++ linux/fs/aufs/i_op_add.c 2011-08-24 13:30:24.731313534 +0200 |
2cbb1c4b | 15016 | @@ -0,0 +1,711 @@ |
4a4d8108 | 15017 | +/* |
027c5e7a | 15018 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
15019 | + * |
15020 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15021 | + * it under the terms of the GNU General Public License as published by | |
15022 | + * the Free Software Foundation; either version 2 of the License, or | |
15023 | + * (at your option) any later version. | |
15024 | + * | |
15025 | + * This program is distributed in the hope that it will be useful, | |
15026 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15027 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15028 | + * GNU General Public License for more details. | |
15029 | + * | |
15030 | + * You should have received a copy of the GNU General Public License | |
15031 | + * along with this program; if not, write to the Free Software | |
15032 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
15033 | + */ | |
15034 | + | |
15035 | +/* | |
15036 | + * inode operations (add entry) | |
15037 | + */ | |
15038 | + | |
15039 | +#include "aufs.h" | |
15040 | + | |
15041 | +/* | |
15042 | + * final procedure of adding a new entry, except link(2). | |
15043 | + * remove whiteout, instantiate, copyup the parent dir's times and size | |
15044 | + * and update version. | |
15045 | + * if it failed, re-create the removed whiteout. | |
15046 | + */ | |
15047 | +static int epilog(struct inode *dir, aufs_bindex_t bindex, | |
15048 | + struct dentry *wh_dentry, struct dentry *dentry) | |
15049 | +{ | |
15050 | + int err, rerr; | |
15051 | + aufs_bindex_t bwh; | |
15052 | + struct path h_path; | |
15053 | + struct inode *inode, *h_dir; | |
15054 | + struct dentry *wh; | |
15055 | + | |
15056 | + bwh = -1; | |
15057 | + if (wh_dentry) { | |
15058 | + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */ | |
15059 | + IMustLock(h_dir); | |
15060 | + AuDebugOn(au_h_iptr(dir, bindex) != h_dir); | |
15061 | + bwh = au_dbwh(dentry); | |
15062 | + h_path.dentry = wh_dentry; | |
15063 | + h_path.mnt = au_sbr_mnt(dir->i_sb, bindex); | |
15064 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, | |
15065 | + dentry); | |
15066 | + if (unlikely(err)) | |
15067 | + goto out; | |
15068 | + } | |
15069 | + | |
15070 | + inode = au_new_inode(dentry, /*must_new*/1); | |
15071 | + if (!IS_ERR(inode)) { | |
15072 | + d_instantiate(dentry, inode); | |
15073 | + dir = dentry->d_parent->d_inode; /* dir inode is locked */ | |
15074 | + IMustLock(dir); | |
15075 | + if (au_ibstart(dir) == au_dbstart(dentry)) | |
15076 | + au_cpup_attr_timesizes(dir); | |
15077 | + dir->i_version++; | |
15078 | + return 0; /* success */ | |
15079 | + } | |
15080 | + | |
15081 | + err = PTR_ERR(inode); | |
15082 | + if (!wh_dentry) | |
15083 | + goto out; | |
15084 | + | |
15085 | + /* revert */ | |
15086 | + /* dir inode is locked */ | |
15087 | + wh = au_wh_create(dentry, bwh, wh_dentry->d_parent); | |
15088 | + rerr = PTR_ERR(wh); | |
15089 | + if (IS_ERR(wh)) { | |
15090 | + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n", | |
15091 | + AuDLNPair(dentry), err, rerr); | |
15092 | + err = -EIO; | |
15093 | + } else | |
15094 | + dput(wh); | |
15095 | + | |
4f0767ce | 15096 | +out: |
4a4d8108 AM |
15097 | + return err; |
15098 | +} | |
15099 | + | |
027c5e7a AM |
15100 | +static int au_d_may_add(struct dentry *dentry) |
15101 | +{ | |
15102 | + int err; | |
15103 | + | |
15104 | + err = 0; | |
15105 | + if (unlikely(d_unhashed(dentry))) | |
15106 | + err = -ENOENT; | |
15107 | + if (unlikely(dentry->d_inode)) | |
15108 | + err = -EEXIST; | |
15109 | + return err; | |
15110 | +} | |
15111 | + | |
4a4d8108 AM |
15112 | +/* |
15113 | + * simple tests for the adding inode operations. | |
15114 | + * following the checks in vfs, plus the parent-child relationship. | |
15115 | + */ | |
15116 | +int au_may_add(struct dentry *dentry, aufs_bindex_t bindex, | |
15117 | + struct dentry *h_parent, int isdir) | |
15118 | +{ | |
15119 | + int err; | |
15120 | + umode_t h_mode; | |
15121 | + struct dentry *h_dentry; | |
15122 | + struct inode *h_inode; | |
15123 | + | |
15124 | + err = -ENAMETOOLONG; | |
15125 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
15126 | + goto out; | |
15127 | + | |
15128 | + h_dentry = au_h_dptr(dentry, bindex); | |
15129 | + h_inode = h_dentry->d_inode; | |
15130 | + if (!dentry->d_inode) { | |
15131 | + err = -EEXIST; | |
15132 | + if (unlikely(h_inode)) | |
15133 | + goto out; | |
15134 | + } else { | |
15135 | + /* rename(2) case */ | |
15136 | + err = -EIO; | |
15137 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
15138 | + goto out; | |
15139 | + | |
15140 | + h_mode = h_inode->i_mode; | |
15141 | + if (!isdir) { | |
15142 | + err = -EISDIR; | |
15143 | + if (unlikely(S_ISDIR(h_mode))) | |
15144 | + goto out; | |
15145 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
15146 | + err = -ENOTDIR; | |
15147 | + goto out; | |
15148 | + } | |
15149 | + } | |
15150 | + | |
15151 | + err = 0; | |
15152 | + /* expected parent dir is locked */ | |
15153 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
15154 | + err = -EIO; | |
15155 | + | |
4f0767ce | 15156 | +out: |
4a4d8108 AM |
15157 | + AuTraceErr(err); |
15158 | + return err; | |
15159 | +} | |
15160 | + | |
15161 | +/* | |
15162 | + * initial procedure of adding a new entry. | |
15163 | + * prepare writable branch and the parent dir, lock it, | |
15164 | + * and lookup whiteout for the new entry. | |
15165 | + */ | |
15166 | +static struct dentry* | |
15167 | +lock_hdir_lkup_wh(struct dentry *dentry, struct au_dtime *dt, | |
15168 | + struct dentry *src_dentry, struct au_pin *pin, | |
15169 | + struct au_wr_dir_args *wr_dir_args) | |
15170 | +{ | |
15171 | + struct dentry *wh_dentry, *h_parent; | |
15172 | + struct super_block *sb; | |
15173 | + struct au_branch *br; | |
15174 | + int err; | |
15175 | + unsigned int udba; | |
15176 | + aufs_bindex_t bcpup; | |
15177 | + | |
15178 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
15179 | + | |
15180 | + err = au_wr_dir(dentry, src_dentry, wr_dir_args); | |
15181 | + bcpup = err; | |
15182 | + wh_dentry = ERR_PTR(err); | |
15183 | + if (unlikely(err < 0)) | |
15184 | + goto out; | |
15185 | + | |
15186 | + sb = dentry->d_sb; | |
15187 | + udba = au_opt_udba(sb); | |
15188 | + err = au_pin(pin, dentry, bcpup, udba, | |
15189 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
15190 | + wh_dentry = ERR_PTR(err); | |
15191 | + if (unlikely(err)) | |
15192 | + goto out; | |
15193 | + | |
15194 | + h_parent = au_pinned_h_parent(pin); | |
15195 | + if (udba != AuOpt_UDBA_NONE | |
15196 | + && au_dbstart(dentry) == bcpup) | |
15197 | + err = au_may_add(dentry, bcpup, h_parent, | |
15198 | + au_ftest_wrdir(wr_dir_args->flags, ISDIR)); | |
15199 | + else if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
15200 | + err = -ENAMETOOLONG; | |
15201 | + wh_dentry = ERR_PTR(err); | |
15202 | + if (unlikely(err)) | |
15203 | + goto out_unpin; | |
15204 | + | |
15205 | + br = au_sbr(sb, bcpup); | |
15206 | + if (dt) { | |
15207 | + struct path tmp = { | |
15208 | + .dentry = h_parent, | |
15209 | + .mnt = br->br_mnt | |
15210 | + }; | |
15211 | + au_dtime_store(dt, au_pinned_parent(pin), &tmp); | |
15212 | + } | |
15213 | + | |
15214 | + wh_dentry = NULL; | |
15215 | + if (bcpup != au_dbwh(dentry)) | |
15216 | + goto out; /* success */ | |
15217 | + | |
15218 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
15219 | + | |
4f0767ce | 15220 | +out_unpin: |
4a4d8108 AM |
15221 | + if (IS_ERR(wh_dentry)) |
15222 | + au_unpin(pin); | |
4f0767ce | 15223 | +out: |
4a4d8108 AM |
15224 | + return wh_dentry; |
15225 | +} | |
15226 | + | |
15227 | +/* ---------------------------------------------------------------------- */ | |
15228 | + | |
15229 | +enum { Mknod, Symlink, Creat }; | |
15230 | +struct simple_arg { | |
15231 | + int type; | |
15232 | + union { | |
15233 | + struct { | |
15234 | + int mode; | |
15235 | + struct nameidata *nd; | |
15236 | + } c; | |
15237 | + struct { | |
15238 | + const char *symname; | |
15239 | + } s; | |
15240 | + struct { | |
15241 | + int mode; | |
15242 | + dev_t dev; | |
15243 | + } m; | |
15244 | + } u; | |
15245 | +}; | |
15246 | + | |
15247 | +static int add_simple(struct inode *dir, struct dentry *dentry, | |
15248 | + struct simple_arg *arg) | |
15249 | +{ | |
15250 | + int err; | |
15251 | + aufs_bindex_t bstart; | |
15252 | + unsigned char created; | |
15253 | + struct au_dtime dt; | |
15254 | + struct au_pin pin; | |
15255 | + struct path h_path; | |
15256 | + struct dentry *wh_dentry, *parent; | |
15257 | + struct inode *h_dir; | |
15258 | + struct au_wr_dir_args wr_dir_args = { | |
15259 | + .force_btgt = -1, | |
15260 | + .flags = AuWrDir_ADD_ENTRY | |
15261 | + }; | |
15262 | + | |
15263 | + AuDbg("%.*s\n", AuDLNPair(dentry)); | |
15264 | + IMustLock(dir); | |
15265 | + | |
15266 | + parent = dentry->d_parent; /* dir inode is locked */ | |
027c5e7a AM |
15267 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
15268 | + if (unlikely(err)) | |
15269 | + goto out; | |
15270 | + err = au_d_may_add(dentry); | |
15271 | + if (unlikely(err)) | |
15272 | + goto out_unlock; | |
4a4d8108 AM |
15273 | + di_write_lock_parent(parent); |
15274 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, /*src_dentry*/NULL, &pin, | |
15275 | + &wr_dir_args); | |
15276 | + err = PTR_ERR(wh_dentry); | |
15277 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 15278 | + goto out_parent; |
4a4d8108 AM |
15279 | + |
15280 | + bstart = au_dbstart(dentry); | |
15281 | + h_path.dentry = au_h_dptr(dentry, bstart); | |
15282 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart); | |
15283 | + h_dir = au_pinned_h_dir(&pin); | |
15284 | + switch (arg->type) { | |
15285 | + case Creat: | |
15286 | + err = vfsub_create(h_dir, &h_path, arg->u.c.mode); | |
15287 | + break; | |
15288 | + case Symlink: | |
15289 | + err = vfsub_symlink(h_dir, &h_path, arg->u.s.symname); | |
15290 | + break; | |
15291 | + case Mknod: | |
15292 | + err = vfsub_mknod(h_dir, &h_path, arg->u.m.mode, arg->u.m.dev); | |
15293 | + break; | |
15294 | + default: | |
15295 | + BUG(); | |
15296 | + } | |
15297 | + created = !err; | |
15298 | + if (!err) | |
15299 | + err = epilog(dir, bstart, wh_dentry, dentry); | |
15300 | + | |
15301 | + /* revert */ | |
15302 | + if (unlikely(created && err && h_path.dentry->d_inode)) { | |
15303 | + int rerr; | |
15304 | + rerr = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
15305 | + if (rerr) { | |
15306 | + AuIOErr("%.*s revert failure(%d, %d)\n", | |
15307 | + AuDLNPair(dentry), err, rerr); | |
15308 | + err = -EIO; | |
15309 | + } | |
15310 | + au_dtime_revert(&dt); | |
4a4d8108 AM |
15311 | + } |
15312 | + | |
15313 | + au_unpin(&pin); | |
15314 | + dput(wh_dentry); | |
15315 | + | |
027c5e7a AM |
15316 | +out_parent: |
15317 | + di_write_unlock(parent); | |
15318 | +out_unlock: | |
4a4d8108 AM |
15319 | + if (unlikely(err)) { |
15320 | + au_update_dbstart(dentry); | |
15321 | + d_drop(dentry); | |
15322 | + } | |
4a4d8108 | 15323 | + aufs_read_unlock(dentry, AuLock_DW); |
027c5e7a | 15324 | +out: |
4a4d8108 AM |
15325 | + return err; |
15326 | +} | |
15327 | + | |
15328 | +int aufs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev) | |
15329 | +{ | |
15330 | + struct simple_arg arg = { | |
15331 | + .type = Mknod, | |
15332 | + .u.m = { | |
15333 | + .mode = mode, | |
15334 | + .dev = dev | |
15335 | + } | |
15336 | + }; | |
15337 | + return add_simple(dir, dentry, &arg); | |
15338 | +} | |
15339 | + | |
15340 | +int aufs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) | |
15341 | +{ | |
15342 | + struct simple_arg arg = { | |
15343 | + .type = Symlink, | |
15344 | + .u.s.symname = symname | |
15345 | + }; | |
15346 | + return add_simple(dir, dentry, &arg); | |
15347 | +} | |
15348 | + | |
15349 | +int aufs_create(struct inode *dir, struct dentry *dentry, int mode, | |
15350 | + struct nameidata *nd) | |
15351 | +{ | |
15352 | + struct simple_arg arg = { | |
15353 | + .type = Creat, | |
15354 | + .u.c = { | |
15355 | + .mode = mode, | |
15356 | + .nd = nd | |
15357 | + } | |
15358 | + }; | |
15359 | + return add_simple(dir, dentry, &arg); | |
15360 | +} | |
15361 | + | |
15362 | +/* ---------------------------------------------------------------------- */ | |
15363 | + | |
15364 | +struct au_link_args { | |
15365 | + aufs_bindex_t bdst, bsrc; | |
15366 | + struct au_pin pin; | |
15367 | + struct path h_path; | |
15368 | + struct dentry *src_parent, *parent; | |
15369 | +}; | |
15370 | + | |
15371 | +static int au_cpup_before_link(struct dentry *src_dentry, | |
15372 | + struct au_link_args *a) | |
15373 | +{ | |
15374 | + int err; | |
15375 | + struct dentry *h_src_dentry; | |
15376 | + struct mutex *h_mtx; | |
15377 | + struct file *h_file; | |
15378 | + | |
15379 | + di_read_lock_parent(a->src_parent, AuLock_IR); | |
15380 | + err = au_test_and_cpup_dirs(src_dentry, a->bdst); | |
15381 | + if (unlikely(err)) | |
15382 | + goto out; | |
15383 | + | |
15384 | + h_src_dentry = au_h_dptr(src_dentry, a->bsrc); | |
15385 | + h_mtx = &h_src_dentry->d_inode->i_mutex; | |
15386 | + err = au_pin(&a->pin, src_dentry, a->bdst, | |
15387 | + au_opt_udba(src_dentry->d_sb), | |
15388 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
15389 | + if (unlikely(err)) | |
15390 | + goto out; | |
15391 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15392 | + h_file = au_h_open_pre(src_dentry, a->bsrc); | |
15393 | + if (IS_ERR(h_file)) { | |
15394 | + err = PTR_ERR(h_file); | |
15395 | + h_file = NULL; | |
15396 | + } else | |
15397 | + err = au_sio_cpup_simple(src_dentry, a->bdst, a->bsrc, | |
15398 | + AuCpup_DTIME /* | AuCpup_KEEPLINO */); | |
15399 | + mutex_unlock(h_mtx); | |
15400 | + au_h_open_post(src_dentry, a->bsrc, h_file); | |
15401 | + au_unpin(&a->pin); | |
15402 | + | |
4f0767ce | 15403 | +out: |
4a4d8108 AM |
15404 | + di_read_unlock(a->src_parent, AuLock_IR); |
15405 | + return err; | |
15406 | +} | |
15407 | + | |
15408 | +static int au_cpup_or_link(struct dentry *src_dentry, struct au_link_args *a) | |
15409 | +{ | |
15410 | + int err; | |
15411 | + unsigned char plink; | |
15412 | + struct inode *h_inode, *inode; | |
15413 | + struct dentry *h_src_dentry; | |
15414 | + struct super_block *sb; | |
15415 | + struct file *h_file; | |
15416 | + | |
15417 | + plink = 0; | |
15418 | + h_inode = NULL; | |
15419 | + sb = src_dentry->d_sb; | |
15420 | + inode = src_dentry->d_inode; | |
15421 | + if (au_ibstart(inode) <= a->bdst) | |
15422 | + h_inode = au_h_iptr(inode, a->bdst); | |
15423 | + if (!h_inode || !h_inode->i_nlink) { | |
15424 | + /* copyup src_dentry as the name of dentry. */ | |
15425 | + au_set_dbstart(src_dentry, a->bdst); | |
15426 | + au_set_h_dptr(src_dentry, a->bdst, dget(a->h_path.dentry)); | |
15427 | + h_inode = au_h_dptr(src_dentry, a->bsrc)->d_inode; | |
15428 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
15429 | + h_file = au_h_open_pre(src_dentry, a->bsrc); | |
15430 | + if (IS_ERR(h_file)) { | |
15431 | + err = PTR_ERR(h_file); | |
15432 | + h_file = NULL; | |
15433 | + } else | |
15434 | + err = au_sio_cpup_single(src_dentry, a->bdst, a->bsrc, | |
15435 | + -1, AuCpup_KEEPLINO, | |
15436 | + a->parent); | |
15437 | + mutex_unlock(&h_inode->i_mutex); | |
15438 | + au_h_open_post(src_dentry, a->bsrc, h_file); | |
15439 | + au_set_h_dptr(src_dentry, a->bdst, NULL); | |
15440 | + au_set_dbstart(src_dentry, a->bsrc); | |
15441 | + } else { | |
15442 | + /* the inode of src_dentry already exists on a.bdst branch */ | |
15443 | + h_src_dentry = d_find_alias(h_inode); | |
15444 | + if (!h_src_dentry && au_plink_test(inode)) { | |
15445 | + plink = 1; | |
15446 | + h_src_dentry = au_plink_lkup(inode, a->bdst); | |
15447 | + err = PTR_ERR(h_src_dentry); | |
15448 | + if (IS_ERR(h_src_dentry)) | |
15449 | + goto out; | |
15450 | + | |
15451 | + if (unlikely(!h_src_dentry->d_inode)) { | |
15452 | + dput(h_src_dentry); | |
15453 | + h_src_dentry = NULL; | |
15454 | + } | |
15455 | + | |
15456 | + } | |
15457 | + if (h_src_dentry) { | |
15458 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), | |
15459 | + &a->h_path); | |
15460 | + dput(h_src_dentry); | |
15461 | + } else { | |
15462 | + AuIOErr("no dentry found for hi%lu on b%d\n", | |
15463 | + h_inode->i_ino, a->bdst); | |
15464 | + err = -EIO; | |
15465 | + } | |
15466 | + } | |
15467 | + | |
15468 | + if (!err && !plink) | |
15469 | + au_plink_append(inode, a->bdst, a->h_path.dentry); | |
15470 | + | |
15471 | +out: | |
2cbb1c4b | 15472 | + AuTraceErr(err); |
4a4d8108 AM |
15473 | + return err; |
15474 | +} | |
15475 | + | |
15476 | +int aufs_link(struct dentry *src_dentry, struct inode *dir, | |
15477 | + struct dentry *dentry) | |
15478 | +{ | |
15479 | + int err, rerr; | |
15480 | + struct au_dtime dt; | |
15481 | + struct au_link_args *a; | |
15482 | + struct dentry *wh_dentry, *h_src_dentry; | |
15483 | + struct inode *inode; | |
15484 | + struct super_block *sb; | |
15485 | + struct au_wr_dir_args wr_dir_args = { | |
15486 | + /* .force_btgt = -1, */ | |
15487 | + .flags = AuWrDir_ADD_ENTRY | |
15488 | + }; | |
15489 | + | |
15490 | + IMustLock(dir); | |
15491 | + inode = src_dentry->d_inode; | |
15492 | + IMustLock(inode); | |
15493 | + | |
4a4d8108 AM |
15494 | + err = -ENOMEM; |
15495 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
15496 | + if (unlikely(!a)) | |
15497 | + goto out; | |
15498 | + | |
15499 | + a->parent = dentry->d_parent; /* dir inode is locked */ | |
027c5e7a AM |
15500 | + err = aufs_read_and_write_lock2(dentry, src_dentry, |
15501 | + AuLock_NOPLM | AuLock_GEN); | |
e49829fe JR |
15502 | + if (unlikely(err)) |
15503 | + goto out_kfree; | |
027c5e7a AM |
15504 | + err = au_d_hashed_positive(src_dentry); |
15505 | + if (unlikely(err)) | |
15506 | + goto out_unlock; | |
15507 | + err = au_d_may_add(dentry); | |
15508 | + if (unlikely(err)) | |
15509 | + goto out_unlock; | |
e49829fe | 15510 | + |
4a4d8108 | 15511 | + a->src_parent = dget_parent(src_dentry); |
2cbb1c4b | 15512 | + wr_dir_args.force_btgt = au_ibstart(inode); |
4a4d8108 AM |
15513 | + |
15514 | + di_write_lock_parent(a->parent); | |
15515 | + wr_dir_args.force_btgt = au_wbr(dentry, wr_dir_args.force_btgt); | |
15516 | + wh_dentry = lock_hdir_lkup_wh(dentry, &dt, src_dentry, &a->pin, | |
15517 | + &wr_dir_args); | |
15518 | + err = PTR_ERR(wh_dentry); | |
15519 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 15520 | + goto out_parent; |
4a4d8108 AM |
15521 | + |
15522 | + err = 0; | |
15523 | + sb = dentry->d_sb; | |
15524 | + a->bdst = au_dbstart(dentry); | |
15525 | + a->h_path.dentry = au_h_dptr(dentry, a->bdst); | |
15526 | + a->h_path.mnt = au_sbr_mnt(sb, a->bdst); | |
2cbb1c4b JR |
15527 | + a->bsrc = au_ibstart(inode); |
15528 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); | |
15529 | + if (!h_src_dentry) { | |
15530 | + a->bsrc = au_dbstart(src_dentry); | |
15531 | + h_src_dentry = au_h_d_alias(src_dentry, a->bsrc); | |
15532 | + AuDebugOn(!h_src_dentry); | |
15533 | + } else if (IS_ERR(h_src_dentry)) | |
15534 | + goto out_parent; | |
15535 | + | |
4a4d8108 AM |
15536 | + if (au_opt_test(au_mntflags(sb), PLINK)) { |
15537 | + if (a->bdst < a->bsrc | |
15538 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) | |
15539 | + err = au_cpup_or_link(src_dentry, a); | |
2cbb1c4b | 15540 | + else |
4a4d8108 AM |
15541 | + err = vfsub_link(h_src_dentry, au_pinned_h_dir(&a->pin), |
15542 | + &a->h_path); | |
2cbb1c4b | 15543 | + dput(h_src_dentry); |
4a4d8108 AM |
15544 | + } else { |
15545 | + /* | |
15546 | + * copyup src_dentry to the branch we process, | |
15547 | + * and then link(2) to it. | |
15548 | + */ | |
2cbb1c4b | 15549 | + dput(h_src_dentry); |
4a4d8108 AM |
15550 | + if (a->bdst < a->bsrc |
15551 | + /* && h_src_dentry->d_sb != a->h_path.dentry->d_sb */) { | |
15552 | + au_unpin(&a->pin); | |
15553 | + di_write_unlock(a->parent); | |
15554 | + err = au_cpup_before_link(src_dentry, a); | |
15555 | + di_write_lock_parent(a->parent); | |
15556 | + if (!err) | |
15557 | + err = au_pin(&a->pin, dentry, a->bdst, | |
15558 | + au_opt_udba(sb), | |
15559 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
15560 | + if (unlikely(err)) | |
15561 | + goto out_wh; | |
15562 | + } | |
15563 | + if (!err) { | |
15564 | + h_src_dentry = au_h_dptr(src_dentry, a->bdst); | |
15565 | + err = -ENOENT; | |
15566 | + if (h_src_dentry && h_src_dentry->d_inode) | |
15567 | + err = vfsub_link(h_src_dentry, | |
15568 | + au_pinned_h_dir(&a->pin), | |
15569 | + &a->h_path); | |
15570 | + } | |
15571 | + } | |
15572 | + if (unlikely(err)) | |
15573 | + goto out_unpin; | |
15574 | + | |
15575 | + if (wh_dentry) { | |
15576 | + a->h_path.dentry = wh_dentry; | |
15577 | + err = au_wh_unlink_dentry(au_pinned_h_dir(&a->pin), &a->h_path, | |
15578 | + dentry); | |
15579 | + if (unlikely(err)) | |
15580 | + goto out_revert; | |
15581 | + } | |
15582 | + | |
15583 | + dir->i_version++; | |
15584 | + if (au_ibstart(dir) == au_dbstart(dentry)) | |
15585 | + au_cpup_attr_timesizes(dir); | |
15586 | + inc_nlink(inode); | |
15587 | + inode->i_ctime = dir->i_ctime; | |
027c5e7a AM |
15588 | + d_instantiate(dentry, au_igrab(inode)); |
15589 | + if (d_unhashed(a->h_path.dentry)) | |
4a4d8108 AM |
15590 | + /* some filesystem calls d_drop() */ |
15591 | + d_drop(dentry); | |
15592 | + goto out_unpin; /* success */ | |
15593 | + | |
4f0767ce | 15594 | +out_revert: |
4a4d8108 | 15595 | + rerr = vfsub_unlink(au_pinned_h_dir(&a->pin), &a->h_path, /*force*/0); |
027c5e7a AM |
15596 | + if (unlikely(rerr)) { |
15597 | + AuIOErr("%.*s reverting failed(%d, %d)\n", | |
15598 | + AuDLNPair(dentry), err, rerr); | |
15599 | + err = -EIO; | |
15600 | + } | |
4a4d8108 | 15601 | + au_dtime_revert(&dt); |
4f0767ce | 15602 | +out_unpin: |
4a4d8108 | 15603 | + au_unpin(&a->pin); |
4f0767ce | 15604 | +out_wh: |
4a4d8108 | 15605 | + dput(wh_dentry); |
027c5e7a AM |
15606 | +out_parent: |
15607 | + di_write_unlock(a->parent); | |
15608 | + dput(a->src_parent); | |
4f0767ce | 15609 | +out_unlock: |
4a4d8108 AM |
15610 | + if (unlikely(err)) { |
15611 | + au_update_dbstart(dentry); | |
15612 | + d_drop(dentry); | |
15613 | + } | |
4a4d8108 | 15614 | + aufs_read_and_write_unlock2(dentry, src_dentry); |
e49829fe | 15615 | +out_kfree: |
4a4d8108 | 15616 | + kfree(a); |
4f0767ce | 15617 | +out: |
4a4d8108 AM |
15618 | + return err; |
15619 | +} | |
15620 | + | |
15621 | +int aufs_mkdir(struct inode *dir, struct dentry *dentry, int mode) | |
15622 | +{ | |
15623 | + int err, rerr; | |
15624 | + aufs_bindex_t bindex; | |
15625 | + unsigned char diropq; | |
15626 | + struct path h_path; | |
15627 | + struct dentry *wh_dentry, *parent, *opq_dentry; | |
15628 | + struct mutex *h_mtx; | |
15629 | + struct super_block *sb; | |
15630 | + struct { | |
15631 | + struct au_pin pin; | |
15632 | + struct au_dtime dt; | |
15633 | + } *a; /* reduce the stack usage */ | |
15634 | + struct au_wr_dir_args wr_dir_args = { | |
15635 | + .force_btgt = -1, | |
15636 | + .flags = AuWrDir_ADD_ENTRY | AuWrDir_ISDIR | |
15637 | + }; | |
15638 | + | |
15639 | + IMustLock(dir); | |
15640 | + | |
15641 | + err = -ENOMEM; | |
15642 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
15643 | + if (unlikely(!a)) | |
15644 | + goto out; | |
15645 | + | |
027c5e7a AM |
15646 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); |
15647 | + if (unlikely(err)) | |
15648 | + goto out_free; | |
15649 | + err = au_d_may_add(dentry); | |
15650 | + if (unlikely(err)) | |
15651 | + goto out_unlock; | |
15652 | + | |
4a4d8108 AM |
15653 | + parent = dentry->d_parent; /* dir inode is locked */ |
15654 | + di_write_lock_parent(parent); | |
15655 | + wh_dentry = lock_hdir_lkup_wh(dentry, &a->dt, /*src_dentry*/NULL, | |
15656 | + &a->pin, &wr_dir_args); | |
15657 | + err = PTR_ERR(wh_dentry); | |
15658 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 15659 | + goto out_parent; |
4a4d8108 AM |
15660 | + |
15661 | + sb = dentry->d_sb; | |
15662 | + bindex = au_dbstart(dentry); | |
15663 | + h_path.dentry = au_h_dptr(dentry, bindex); | |
15664 | + h_path.mnt = au_sbr_mnt(sb, bindex); | |
15665 | + err = vfsub_mkdir(au_pinned_h_dir(&a->pin), &h_path, mode); | |
15666 | + if (unlikely(err)) | |
027c5e7a | 15667 | + goto out_unpin; |
4a4d8108 AM |
15668 | + |
15669 | + /* make the dir opaque */ | |
15670 | + diropq = 0; | |
15671 | + h_mtx = &h_path.dentry->d_inode->i_mutex; | |
15672 | + if (wh_dentry | |
15673 | + || au_opt_test(au_mntflags(sb), ALWAYS_DIROPQ)) { | |
15674 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15675 | + opq_dentry = au_diropq_create(dentry, bindex); | |
15676 | + mutex_unlock(h_mtx); | |
15677 | + err = PTR_ERR(opq_dentry); | |
15678 | + if (IS_ERR(opq_dentry)) | |
15679 | + goto out_dir; | |
15680 | + dput(opq_dentry); | |
15681 | + diropq = 1; | |
15682 | + } | |
15683 | + | |
15684 | + err = epilog(dir, bindex, wh_dentry, dentry); | |
15685 | + if (!err) { | |
15686 | + inc_nlink(dir); | |
027c5e7a | 15687 | + goto out_unpin; /* success */ |
4a4d8108 AM |
15688 | + } |
15689 | + | |
15690 | + /* revert */ | |
15691 | + if (diropq) { | |
15692 | + AuLabel(revert opq); | |
15693 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
15694 | + rerr = au_diropq_remove(dentry, bindex); | |
15695 | + mutex_unlock(h_mtx); | |
15696 | + if (rerr) { | |
15697 | + AuIOErr("%.*s reverting diropq failed(%d, %d)\n", | |
15698 | + AuDLNPair(dentry), err, rerr); | |
15699 | + err = -EIO; | |
15700 | + } | |
15701 | + } | |
15702 | + | |
4f0767ce | 15703 | +out_dir: |
4a4d8108 AM |
15704 | + AuLabel(revert dir); |
15705 | + rerr = vfsub_rmdir(au_pinned_h_dir(&a->pin), &h_path); | |
15706 | + if (rerr) { | |
15707 | + AuIOErr("%.*s reverting dir failed(%d, %d)\n", | |
15708 | + AuDLNPair(dentry), err, rerr); | |
15709 | + err = -EIO; | |
15710 | + } | |
4a4d8108 | 15711 | + au_dtime_revert(&a->dt); |
027c5e7a | 15712 | +out_unpin: |
4a4d8108 AM |
15713 | + au_unpin(&a->pin); |
15714 | + dput(wh_dentry); | |
027c5e7a AM |
15715 | +out_parent: |
15716 | + di_write_unlock(parent); | |
15717 | +out_unlock: | |
4a4d8108 AM |
15718 | + if (unlikely(err)) { |
15719 | + au_update_dbstart(dentry); | |
15720 | + d_drop(dentry); | |
15721 | + } | |
4a4d8108 | 15722 | + aufs_read_unlock(dentry, AuLock_DW); |
027c5e7a | 15723 | +out_free: |
4a4d8108 | 15724 | + kfree(a); |
4f0767ce | 15725 | +out: |
4a4d8108 AM |
15726 | + return err; |
15727 | +} | |
7f207e10 AM |
15728 | diff -urN /usr/share/empty/fs/aufs/i_op.c linux/fs/aufs/i_op.c |
15729 | --- /usr/share/empty/fs/aufs/i_op.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 15730 | +++ linux/fs/aufs/i_op.c 2011-08-24 13:30:24.731313534 +0200 |
027c5e7a | 15731 | @@ -0,0 +1,976 @@ |
4a4d8108 | 15732 | +/* |
027c5e7a | 15733 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
4a4d8108 AM |
15734 | + * |
15735 | + * This program, aufs is free software; you can redistribute it and/or modify | |
15736 | + * it under the terms of the GNU General Public License as published by | |
15737 | + * the Free Software Foundation; either version 2 of the License, or | |
15738 | + * (at your option) any later version. | |
15739 | + * | |
15740 | + * This program is distributed in the hope that it will be useful, | |
15741 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
15742 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
15743 | + * GNU General Public License for more details. | |
15744 | + * | |
15745 | + * You should have received a copy of the GNU General Public License | |
15746 | + * along with this program; if not, write to the Free Software | |
15747 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
15748 | + */ | |
1facf9fc | 15749 | + |
1308ab2a | 15750 | +/* |
4a4d8108 | 15751 | + * inode operations (except add/del/rename) |
1308ab2a | 15752 | + */ |
4a4d8108 AM |
15753 | + |
15754 | +#include <linux/device_cgroup.h> | |
15755 | +#include <linux/fs_stack.h> | |
15756 | +#include <linux/mm.h> | |
15757 | +#include <linux/namei.h> | |
15758 | +#include <linux/security.h> | |
15759 | +#include <linux/uaccess.h> | |
15760 | +#include "aufs.h" | |
15761 | + | |
027c5e7a | 15762 | +static int h_permission(struct inode *h_inode, int mask, unsigned int flags, |
4a4d8108 | 15763 | + struct vfsmount *h_mnt, int brperm) |
1facf9fc | 15764 | +{ |
1308ab2a | 15765 | + int err; |
4a4d8108 | 15766 | + const unsigned char write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); |
1facf9fc | 15767 | + |
4a4d8108 AM |
15768 | + err = -EACCES; |
15769 | + if ((write_mask && IS_IMMUTABLE(h_inode)) | |
15770 | + || ((mask & MAY_EXEC) | |
15771 | + && S_ISREG(h_inode->i_mode) | |
15772 | + && ((h_mnt->mnt_flags & MNT_NOEXEC) | |
15773 | + || !(h_inode->i_mode & S_IXUGO)))) | |
15774 | + goto out; | |
15775 | + | |
15776 | + /* | |
15777 | + * - skip the lower fs test in the case of write to ro branch. | |
15778 | + * - nfs dir permission write check is optimized, but a policy for | |
15779 | + * link/rename requires a real check. | |
15780 | + */ | |
15781 | + if ((write_mask && !au_br_writable(brperm)) | |
15782 | + || (au_test_nfs(h_inode->i_sb) && S_ISDIR(h_inode->i_mode) | |
15783 | + && write_mask && !(mask & MAY_READ)) | |
15784 | + || !h_inode->i_op->permission) { | |
15785 | + /* AuLabel(generic_permission); */ | |
027c5e7a | 15786 | + err = generic_permission(h_inode, mask, flags, |
4a4d8108 | 15787 | + h_inode->i_op->check_acl); |
1308ab2a | 15788 | + } else { |
4a4d8108 | 15789 | + /* AuLabel(h_inode->permission); */ |
027c5e7a | 15790 | + err = h_inode->i_op->permission(h_inode, mask, flags); |
4a4d8108 AM |
15791 | + AuTraceErr(err); |
15792 | + } | |
1facf9fc | 15793 | + |
4a4d8108 AM |
15794 | + if (!err) |
15795 | + err = devcgroup_inode_permission(h_inode, mask); | |
7f207e10 | 15796 | + if (!err) |
4a4d8108 | 15797 | + err = security_inode_permission(h_inode, mask); |
4a4d8108 AM |
15798 | + |
15799 | +#if 0 | |
15800 | + if (!err) { | |
15801 | + /* todo: do we need to call ima_path_check()? */ | |
15802 | + struct path h_path = { | |
15803 | + .dentry = | |
15804 | + .mnt = h_mnt | |
15805 | + }; | |
15806 | + err = ima_path_check(&h_path, | |
15807 | + mask & (MAY_READ | MAY_WRITE | MAY_EXEC), | |
15808 | + IMA_COUNT_LEAVE); | |
1308ab2a | 15809 | + } |
4a4d8108 | 15810 | +#endif |
dece6358 | 15811 | + |
4f0767ce | 15812 | +out: |
1308ab2a | 15813 | + return err; |
15814 | +} | |
dece6358 | 15815 | + |
027c5e7a | 15816 | +static int aufs_permission(struct inode *inode, int mask, unsigned int flags) |
1308ab2a | 15817 | +{ |
15818 | + int err; | |
4a4d8108 AM |
15819 | + aufs_bindex_t bindex, bend; |
15820 | + const unsigned char isdir = !!S_ISDIR(inode->i_mode), | |
15821 | + write_mask = !!(mask & (MAY_WRITE | MAY_APPEND)); | |
15822 | + struct inode *h_inode; | |
15823 | + struct super_block *sb; | |
15824 | + struct au_branch *br; | |
1facf9fc | 15825 | + |
027c5e7a AM |
15826 | + /* todo: support rcu-walk? */ |
15827 | + if (flags & IPERM_FLAG_RCU) | |
15828 | + return -ECHILD; | |
15829 | + | |
4a4d8108 AM |
15830 | + sb = inode->i_sb; |
15831 | + si_read_lock(sb, AuLock_FLUSH); | |
15832 | + ii_read_lock_child(inode); | |
027c5e7a AM |
15833 | +#if 0 |
15834 | + err = au_iigen_test(inode, au_sigen(sb)); | |
15835 | + if (unlikely(err)) | |
15836 | + goto out; | |
15837 | +#endif | |
dece6358 | 15838 | + |
4a4d8108 AM |
15839 | + if (!isdir || write_mask) { |
15840 | + err = au_busy_or_stale(); | |
15841 | + h_inode = au_h_iptr(inode, au_ibstart(inode)); | |
15842 | + if (unlikely(!h_inode | |
15843 | + || (h_inode->i_mode & S_IFMT) | |
15844 | + != (inode->i_mode & S_IFMT))) | |
15845 | + goto out; | |
1facf9fc | 15846 | + |
4a4d8108 AM |
15847 | + err = 0; |
15848 | + bindex = au_ibstart(inode); | |
15849 | + br = au_sbr(sb, bindex); | |
027c5e7a AM |
15850 | + err = h_permission(h_inode, mask, flags, br->br_mnt, |
15851 | + br->br_perm); | |
4a4d8108 AM |
15852 | + if (write_mask |
15853 | + && !err | |
15854 | + && !special_file(h_inode->i_mode)) { | |
15855 | + /* test whether the upper writable branch exists */ | |
15856 | + err = -EROFS; | |
15857 | + for (; bindex >= 0; bindex--) | |
15858 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
15859 | + err = 0; | |
15860 | + break; | |
15861 | + } | |
15862 | + } | |
15863 | + goto out; | |
15864 | + } | |
dece6358 | 15865 | + |
4a4d8108 | 15866 | + /* non-write to dir */ |
1308ab2a | 15867 | + err = 0; |
4a4d8108 AM |
15868 | + bend = au_ibend(inode); |
15869 | + for (bindex = au_ibstart(inode); !err && bindex <= bend; bindex++) { | |
15870 | + h_inode = au_h_iptr(inode, bindex); | |
15871 | + if (h_inode) { | |
15872 | + err = au_busy_or_stale(); | |
15873 | + if (unlikely(!S_ISDIR(h_inode->i_mode))) | |
15874 | + break; | |
15875 | + | |
15876 | + br = au_sbr(sb, bindex); | |
027c5e7a | 15877 | + err = h_permission(h_inode, mask, flags, br->br_mnt, |
4a4d8108 AM |
15878 | + br->br_perm); |
15879 | + } | |
15880 | + } | |
1308ab2a | 15881 | + |
4f0767ce | 15882 | +out: |
4a4d8108 AM |
15883 | + ii_read_unlock(inode); |
15884 | + si_read_unlock(sb); | |
1308ab2a | 15885 | + return err; |
15886 | +} | |
15887 | + | |
4a4d8108 | 15888 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15889 | + |
4a4d8108 AM |
15890 | +static struct dentry *aufs_lookup(struct inode *dir, struct dentry *dentry, |
15891 | + struct nameidata *nd) | |
15892 | +{ | |
15893 | + struct dentry *ret, *parent; | |
b752ccd1 | 15894 | + struct inode *inode; |
4a4d8108 AM |
15895 | + struct super_block *sb; |
15896 | + int err, npositive; | |
dece6358 | 15897 | + |
4a4d8108 | 15898 | + IMustLock(dir); |
1308ab2a | 15899 | + |
4a4d8108 | 15900 | + sb = dir->i_sb; |
7f207e10 AM |
15901 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
15902 | + ret = ERR_PTR(err); | |
15903 | + if (unlikely(err)) | |
15904 | + goto out; | |
15905 | + | |
4a4d8108 AM |
15906 | + ret = ERR_PTR(-ENAMETOOLONG); |
15907 | + if (unlikely(dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
7f207e10 | 15908 | + goto out_si; |
4a4d8108 AM |
15909 | + err = au_di_init(dentry); |
15910 | + ret = ERR_PTR(err); | |
15911 | + if (unlikely(err)) | |
7f207e10 | 15912 | + goto out_si; |
1308ab2a | 15913 | + |
027c5e7a | 15914 | + npositive = 0; /* suppress a warning */ |
4a4d8108 AM |
15915 | + parent = dentry->d_parent; /* dir inode is locked */ |
15916 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a AM |
15917 | + err = au_alive_dir(parent); |
15918 | + if (!err) | |
15919 | + err = au_digen_test(parent, au_sigen(sb)); | |
15920 | + if (!err) { | |
15921 | + npositive = au_lkup_dentry(dentry, au_dbstart(parent), | |
15922 | + /*type*/0, nd); | |
15923 | + err = npositive; | |
15924 | + } | |
4a4d8108 | 15925 | + di_read_unlock(parent, AuLock_IR); |
4a4d8108 AM |
15926 | + ret = ERR_PTR(err); |
15927 | + if (unlikely(err < 0)) | |
15928 | + goto out_unlock; | |
1308ab2a | 15929 | + |
4a4d8108 AM |
15930 | + inode = NULL; |
15931 | + if (npositive) { | |
b752ccd1 | 15932 | + inode = au_new_inode(dentry, /*must_new*/0); |
4a4d8108 | 15933 | + ret = (void *)inode; |
1facf9fc | 15934 | + } |
4a4d8108 AM |
15935 | + if (IS_ERR(inode)) |
15936 | + goto out_unlock; | |
15937 | + | |
15938 | + ret = d_splice_alias(inode, dentry); | |
7f207e10 | 15939 | + if (unlikely(IS_ERR(ret) && inode)) { |
4a4d8108 | 15940 | + ii_write_unlock(inode); |
7f207e10 AM |
15941 | + iput(inode); |
15942 | + } | |
1facf9fc | 15943 | + |
4f0767ce | 15944 | +out_unlock: |
4a4d8108 | 15945 | + di_write_unlock(dentry); |
7f207e10 | 15946 | +out_si: |
4a4d8108 | 15947 | + si_read_unlock(sb); |
7f207e10 | 15948 | +out: |
4a4d8108 AM |
15949 | + return ret; |
15950 | +} | |
1facf9fc | 15951 | + |
4a4d8108 | 15952 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 15953 | + |
4a4d8108 AM |
15954 | +static int au_wr_dir_cpup(struct dentry *dentry, struct dentry *parent, |
15955 | + const unsigned char add_entry, aufs_bindex_t bcpup, | |
15956 | + aufs_bindex_t bstart) | |
15957 | +{ | |
15958 | + int err; | |
15959 | + struct dentry *h_parent; | |
15960 | + struct inode *h_dir; | |
1facf9fc | 15961 | + |
027c5e7a | 15962 | + if (add_entry) |
4a4d8108 | 15963 | + IMustLock(parent->d_inode); |
027c5e7a | 15964 | + else |
4a4d8108 AM |
15965 | + di_write_lock_parent(parent); |
15966 | + | |
15967 | + err = 0; | |
15968 | + if (!au_h_dptr(parent, bcpup)) { | |
15969 | + if (bstart < bcpup) | |
15970 | + err = au_cpdown_dirs(dentry, bcpup); | |
15971 | + else | |
15972 | + err = au_cpup_dirs(dentry, bcpup); | |
15973 | + } | |
15974 | + if (!err && add_entry) { | |
15975 | + h_parent = au_h_dptr(parent, bcpup); | |
15976 | + h_dir = h_parent->d_inode; | |
15977 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
15978 | + err = au_lkup_neg(dentry, bcpup); | |
15979 | + /* todo: no unlock here */ | |
15980 | + mutex_unlock(&h_dir->i_mutex); | |
027c5e7a AM |
15981 | + |
15982 | + AuDbg("bcpup %d\n", bcpup); | |
15983 | + if (!err) { | |
15984 | + if (!dentry->d_inode) | |
15985 | + au_set_h_dptr(dentry, bstart, NULL); | |
4a4d8108 AM |
15986 | + au_update_dbrange(dentry, /*do_put_zero*/0); |
15987 | + } | |
1308ab2a | 15988 | + } |
1facf9fc | 15989 | + |
4a4d8108 AM |
15990 | + if (!add_entry) |
15991 | + di_write_unlock(parent); | |
15992 | + if (!err) | |
15993 | + err = bcpup; /* success */ | |
1308ab2a | 15994 | + |
027c5e7a | 15995 | + AuTraceErr(err); |
4a4d8108 AM |
15996 | + return err; |
15997 | +} | |
1facf9fc | 15998 | + |
4a4d8108 AM |
15999 | +/* |
16000 | + * decide the branch and the parent dir where we will create a new entry. | |
16001 | + * returns new bindex or an error. | |
16002 | + * copyup the parent dir if needed. | |
16003 | + */ | |
16004 | +int au_wr_dir(struct dentry *dentry, struct dentry *src_dentry, | |
16005 | + struct au_wr_dir_args *args) | |
16006 | +{ | |
16007 | + int err; | |
16008 | + aufs_bindex_t bcpup, bstart, src_bstart; | |
16009 | + const unsigned char add_entry = !!au_ftest_wrdir(args->flags, | |
16010 | + ADD_ENTRY); | |
16011 | + struct super_block *sb; | |
16012 | + struct dentry *parent; | |
16013 | + struct au_sbinfo *sbinfo; | |
1facf9fc | 16014 | + |
4a4d8108 AM |
16015 | + sb = dentry->d_sb; |
16016 | + sbinfo = au_sbi(sb); | |
16017 | + parent = dget_parent(dentry); | |
16018 | + bstart = au_dbstart(dentry); | |
16019 | + bcpup = bstart; | |
16020 | + if (args->force_btgt < 0) { | |
16021 | + if (src_dentry) { | |
16022 | + src_bstart = au_dbstart(src_dentry); | |
16023 | + if (src_bstart < bstart) | |
16024 | + bcpup = src_bstart; | |
16025 | + } else if (add_entry) { | |
16026 | + err = AuWbrCreate(sbinfo, dentry, | |
16027 | + au_ftest_wrdir(args->flags, ISDIR)); | |
16028 | + bcpup = err; | |
16029 | + } | |
1facf9fc | 16030 | + |
4a4d8108 AM |
16031 | + if (bcpup < 0 || au_test_ro(sb, bcpup, dentry->d_inode)) { |
16032 | + if (add_entry) | |
16033 | + err = AuWbrCopyup(sbinfo, dentry); | |
16034 | + else { | |
16035 | + if (!IS_ROOT(dentry)) { | |
16036 | + di_read_lock_parent(parent, !AuLock_IR); | |
16037 | + err = AuWbrCopyup(sbinfo, dentry); | |
16038 | + di_read_unlock(parent, !AuLock_IR); | |
16039 | + } else | |
16040 | + err = AuWbrCopyup(sbinfo, dentry); | |
16041 | + } | |
16042 | + bcpup = err; | |
16043 | + if (unlikely(err < 0)) | |
16044 | + goto out; | |
16045 | + } | |
16046 | + } else { | |
16047 | + bcpup = args->force_btgt; | |
16048 | + AuDebugOn(au_test_ro(sb, bcpup, dentry->d_inode)); | |
1308ab2a | 16049 | + } |
027c5e7a | 16050 | + |
4a4d8108 AM |
16051 | + AuDbg("bstart %d, bcpup %d\n", bstart, bcpup); |
16052 | + err = bcpup; | |
16053 | + if (bcpup == bstart) | |
16054 | + goto out; /* success */ | |
4a4d8108 AM |
16055 | + |
16056 | + /* copyup the new parent into the branch we process */ | |
16057 | + err = au_wr_dir_cpup(dentry, parent, add_entry, bcpup, bstart); | |
027c5e7a AM |
16058 | + if (err >= 0) { |
16059 | + if (!dentry->d_inode) { | |
16060 | + au_set_h_dptr(dentry, bstart, NULL); | |
16061 | + au_set_dbstart(dentry, bcpup); | |
16062 | + au_set_dbend(dentry, bcpup); | |
16063 | + } | |
16064 | + AuDebugOn(add_entry && !au_h_dptr(dentry, bcpup)); | |
16065 | + } | |
4a4d8108 | 16066 | + |
4f0767ce | 16067 | +out: |
4a4d8108 | 16068 | + dput(parent); |
dece6358 AM |
16069 | + return err; |
16070 | +} | |
1facf9fc | 16071 | + |
1308ab2a | 16072 | +/* ---------------------------------------------------------------------- */ |
16073 | + | |
4a4d8108 | 16074 | +struct dentry *au_pinned_h_parent(struct au_pin *pin) |
1308ab2a | 16075 | +{ |
4a4d8108 AM |
16076 | + if (pin && pin->parent) |
16077 | + return au_h_dptr(pin->parent, pin->bindex); | |
16078 | + return NULL; | |
dece6358 | 16079 | +} |
1facf9fc | 16080 | + |
4a4d8108 | 16081 | +void au_unpin(struct au_pin *p) |
dece6358 | 16082 | +{ |
e49829fe | 16083 | + if (p->h_mnt && au_ftest_pin(p->flags, MNT_WRITE)) |
4a4d8108 AM |
16084 | + mnt_drop_write(p->h_mnt); |
16085 | + if (!p->hdir) | |
16086 | + return; | |
1facf9fc | 16087 | + |
4a4d8108 AM |
16088 | + au_hn_imtx_unlock(p->hdir); |
16089 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
16090 | + di_read_unlock(p->parent, AuLock_IR); | |
16091 | + iput(p->hdir->hi_inode); | |
16092 | + dput(p->parent); | |
16093 | + p->parent = NULL; | |
16094 | + p->hdir = NULL; | |
16095 | + p->h_mnt = NULL; | |
16096 | +} | |
1308ab2a | 16097 | + |
4a4d8108 AM |
16098 | +int au_do_pin(struct au_pin *p) |
16099 | +{ | |
16100 | + int err; | |
16101 | + struct super_block *sb; | |
16102 | + struct dentry *h_dentry, *h_parent; | |
16103 | + struct au_branch *br; | |
16104 | + struct inode *h_dir; | |
16105 | + | |
16106 | + err = 0; | |
16107 | + sb = p->dentry->d_sb; | |
16108 | + br = au_sbr(sb, p->bindex); | |
16109 | + if (IS_ROOT(p->dentry)) { | |
16110 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { | |
16111 | + p->h_mnt = br->br_mnt; | |
16112 | + err = mnt_want_write(p->h_mnt); | |
16113 | + if (unlikely(err)) { | |
16114 | + au_fclr_pin(p->flags, MNT_WRITE); | |
16115 | + goto out_err; | |
16116 | + } | |
16117 | + } | |
dece6358 | 16118 | + goto out; |
1facf9fc | 16119 | + } |
16120 | + | |
4a4d8108 AM |
16121 | + h_dentry = NULL; |
16122 | + if (p->bindex <= au_dbend(p->dentry)) | |
16123 | + h_dentry = au_h_dptr(p->dentry, p->bindex); | |
dece6358 | 16124 | + |
4a4d8108 AM |
16125 | + p->parent = dget_parent(p->dentry); |
16126 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) | |
16127 | + di_read_lock(p->parent, AuLock_IR, p->lsc_di); | |
dece6358 | 16128 | + |
4a4d8108 AM |
16129 | + h_dir = NULL; |
16130 | + h_parent = au_h_dptr(p->parent, p->bindex); | |
16131 | + p->hdir = au_hi(p->parent->d_inode, p->bindex); | |
16132 | + if (p->hdir) | |
16133 | + h_dir = p->hdir->hi_inode; | |
dece6358 | 16134 | + |
b752ccd1 AM |
16135 | + /* |
16136 | + * udba case, or | |
16137 | + * if DI_LOCKED is not set, then p->parent may be different | |
16138 | + * and h_parent can be NULL. | |
16139 | + */ | |
16140 | + if (unlikely(!p->hdir || !h_dir || !h_parent)) { | |
e49829fe | 16141 | + err = -EBUSY; |
4a4d8108 AM |
16142 | + if (!au_ftest_pin(p->flags, DI_LOCKED)) |
16143 | + di_read_unlock(p->parent, AuLock_IR); | |
16144 | + dput(p->parent); | |
16145 | + p->parent = NULL; | |
16146 | + goto out_err; | |
16147 | + } | |
1308ab2a | 16148 | + |
4a4d8108 AM |
16149 | + au_igrab(h_dir); |
16150 | + au_hn_imtx_lock_nested(p->hdir, p->lsc_hi); | |
1308ab2a | 16151 | + |
4a4d8108 AM |
16152 | + if (unlikely(p->hdir->hi_inode != h_parent->d_inode)) { |
16153 | + err = -EBUSY; | |
16154 | + goto out_unpin; | |
16155 | + } | |
16156 | + if (h_dentry) { | |
16157 | + err = au_h_verify(h_dentry, p->udba, h_dir, h_parent, br); | |
16158 | + if (unlikely(err)) { | |
16159 | + au_fclr_pin(p->flags, MNT_WRITE); | |
16160 | + goto out_unpin; | |
16161 | + } | |
1facf9fc | 16162 | + } |
dece6358 | 16163 | + |
4a4d8108 AM |
16164 | + if (au_ftest_pin(p->flags, MNT_WRITE)) { |
16165 | + p->h_mnt = br->br_mnt; | |
16166 | + err = mnt_want_write(p->h_mnt); | |
dece6358 | 16167 | + if (unlikely(err)) { |
4a4d8108 AM |
16168 | + au_fclr_pin(p->flags, MNT_WRITE); |
16169 | + goto out_unpin; | |
dece6358 AM |
16170 | + } |
16171 | + } | |
4a4d8108 AM |
16172 | + goto out; /* success */ |
16173 | + | |
4f0767ce | 16174 | +out_unpin: |
4a4d8108 | 16175 | + au_unpin(p); |
4f0767ce | 16176 | +out_err: |
4a4d8108 AM |
16177 | + pr_err("err %d\n", err); |
16178 | + err = au_busy_or_stale(); | |
4f0767ce | 16179 | +out: |
1facf9fc | 16180 | + return err; |
16181 | +} | |
16182 | + | |
4a4d8108 AM |
16183 | +void au_pin_init(struct au_pin *p, struct dentry *dentry, |
16184 | + aufs_bindex_t bindex, int lsc_di, int lsc_hi, | |
16185 | + unsigned int udba, unsigned char flags) | |
16186 | +{ | |
16187 | + p->dentry = dentry; | |
16188 | + p->udba = udba; | |
16189 | + p->lsc_di = lsc_di; | |
16190 | + p->lsc_hi = lsc_hi; | |
16191 | + p->flags = flags; | |
16192 | + p->bindex = bindex; | |
16193 | + | |
16194 | + p->parent = NULL; | |
16195 | + p->hdir = NULL; | |
16196 | + p->h_mnt = NULL; | |
16197 | +} | |
16198 | + | |
16199 | +int au_pin(struct au_pin *pin, struct dentry *dentry, aufs_bindex_t bindex, | |
16200 | + unsigned int udba, unsigned char flags) | |
16201 | +{ | |
16202 | + au_pin_init(pin, dentry, bindex, AuLsc_DI_PARENT, AuLsc_I_PARENT2, | |
16203 | + udba, flags); | |
16204 | + return au_do_pin(pin); | |
16205 | +} | |
16206 | + | |
dece6358 AM |
16207 | +/* ---------------------------------------------------------------------- */ |
16208 | + | |
1308ab2a | 16209 | +/* |
4a4d8108 AM |
16210 | + * ->setattr() and ->getattr() are called in various cases. |
16211 | + * chmod, stat: dentry is revalidated. | |
16212 | + * fchmod, fstat: file and dentry are not revalidated, additionally they may be | |
16213 | + * unhashed. | |
16214 | + * for ->setattr(), ia->ia_file is passed from ftruncate only. | |
1308ab2a | 16215 | + */ |
027c5e7a | 16216 | +/* todo: consolidate with do_refresh() and simple_reval_dpath() */ |
4a4d8108 | 16217 | +static int au_reval_for_attr(struct dentry *dentry, unsigned int sigen) |
1facf9fc | 16218 | +{ |
4a4d8108 AM |
16219 | + int err; |
16220 | + struct inode *inode; | |
16221 | + struct dentry *parent; | |
1facf9fc | 16222 | + |
1308ab2a | 16223 | + err = 0; |
4a4d8108 | 16224 | + inode = dentry->d_inode; |
027c5e7a | 16225 | + if (au_digen_test(dentry, sigen)) { |
4a4d8108 AM |
16226 | + parent = dget_parent(dentry); |
16227 | + di_read_lock_parent(parent, AuLock_IR); | |
027c5e7a | 16228 | + err = au_refresh_dentry(dentry, parent); |
4a4d8108 AM |
16229 | + di_read_unlock(parent, AuLock_IR); |
16230 | + dput(parent); | |
dece6358 | 16231 | + } |
1facf9fc | 16232 | + |
4a4d8108 | 16233 | + AuTraceErr(err); |
1308ab2a | 16234 | + return err; |
16235 | +} | |
dece6358 | 16236 | + |
4a4d8108 AM |
16237 | +#define AuIcpup_DID_CPUP 1 |
16238 | +#define au_ftest_icpup(flags, name) ((flags) & AuIcpup_##name) | |
7f207e10 AM |
16239 | +#define au_fset_icpup(flags, name) \ |
16240 | + do { (flags) |= AuIcpup_##name; } while (0) | |
16241 | +#define au_fclr_icpup(flags, name) \ | |
16242 | + do { (flags) &= ~AuIcpup_##name; } while (0) | |
1308ab2a | 16243 | + |
4a4d8108 AM |
16244 | +struct au_icpup_args { |
16245 | + unsigned char flags; | |
16246 | + unsigned char pin_flags; | |
16247 | + aufs_bindex_t btgt; | |
16248 | + unsigned int udba; | |
16249 | + struct au_pin pin; | |
16250 | + struct path h_path; | |
16251 | + struct inode *h_inode; | |
16252 | +}; | |
1308ab2a | 16253 | + |
4a4d8108 AM |
16254 | +static int au_pin_and_icpup(struct dentry *dentry, struct iattr *ia, |
16255 | + struct au_icpup_args *a) | |
1308ab2a | 16256 | +{ |
16257 | + int err; | |
4a4d8108 | 16258 | + loff_t sz; |
e49829fe | 16259 | + aufs_bindex_t bstart, ibstart; |
4a4d8108 AM |
16260 | + struct dentry *hi_wh, *parent; |
16261 | + struct inode *inode; | |
16262 | + struct file *h_file; | |
16263 | + struct au_wr_dir_args wr_dir_args = { | |
16264 | + .force_btgt = -1, | |
16265 | + .flags = 0 | |
16266 | + }; | |
16267 | + | |
16268 | + bstart = au_dbstart(dentry); | |
16269 | + inode = dentry->d_inode; | |
16270 | + if (S_ISDIR(inode->i_mode)) | |
16271 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); | |
16272 | + /* plink or hi_wh() case */ | |
e49829fe | 16273 | + ibstart = au_ibstart(inode); |
027c5e7a | 16274 | + if (bstart != ibstart && !au_test_ro(inode->i_sb, ibstart, inode)) |
e49829fe | 16275 | + wr_dir_args.force_btgt = ibstart; |
4a4d8108 AM |
16276 | + err = au_wr_dir(dentry, /*src_dentry*/NULL, &wr_dir_args); |
16277 | + if (unlikely(err < 0)) | |
16278 | + goto out; | |
16279 | + a->btgt = err; | |
16280 | + if (err != bstart) | |
16281 | + au_fset_icpup(a->flags, DID_CPUP); | |
16282 | + | |
16283 | + err = 0; | |
16284 | + a->pin_flags = AuPin_MNT_WRITE; | |
16285 | + parent = NULL; | |
16286 | + if (!IS_ROOT(dentry)) { | |
16287 | + au_fset_pin(a->pin_flags, DI_LOCKED); | |
16288 | + parent = dget_parent(dentry); | |
16289 | + di_write_lock_parent(parent); | |
16290 | + } | |
16291 | + | |
16292 | + err = au_pin(&a->pin, dentry, a->btgt, a->udba, a->pin_flags); | |
16293 | + if (unlikely(err)) | |
16294 | + goto out_parent; | |
16295 | + | |
16296 | + a->h_path.dentry = au_h_dptr(dentry, bstart); | |
16297 | + a->h_inode = a->h_path.dentry->d_inode; | |
16298 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
16299 | + sz = -1; | |
16300 | + if ((ia->ia_valid & ATTR_SIZE) && ia->ia_size < i_size_read(a->h_inode)) | |
16301 | + sz = ia->ia_size; | |
16302 | + | |
16303 | + h_file = NULL; | |
16304 | + hi_wh = NULL; | |
027c5e7a | 16305 | + if (au_ftest_icpup(a->flags, DID_CPUP) && d_unlinked(dentry)) { |
4a4d8108 AM |
16306 | + hi_wh = au_hi_wh(inode, a->btgt); |
16307 | + if (!hi_wh) { | |
16308 | + err = au_sio_cpup_wh(dentry, a->btgt, sz, /*file*/NULL); | |
16309 | + if (unlikely(err)) | |
16310 | + goto out_unlock; | |
16311 | + hi_wh = au_hi_wh(inode, a->btgt); | |
16312 | + /* todo: revalidate hi_wh? */ | |
16313 | + } | |
16314 | + } | |
16315 | + | |
16316 | + if (parent) { | |
16317 | + au_pin_set_parent_lflag(&a->pin, /*lflag*/0); | |
16318 | + di_downgrade_lock(parent, AuLock_IR); | |
16319 | + dput(parent); | |
16320 | + parent = NULL; | |
16321 | + } | |
16322 | + if (!au_ftest_icpup(a->flags, DID_CPUP)) | |
16323 | + goto out; /* success */ | |
16324 | + | |
16325 | + if (!d_unhashed(dentry)) { | |
16326 | + h_file = au_h_open_pre(dentry, bstart); | |
16327 | + if (IS_ERR(h_file)) { | |
16328 | + err = PTR_ERR(h_file); | |
16329 | + h_file = NULL; | |
16330 | + } else | |
16331 | + err = au_sio_cpup_simple(dentry, a->btgt, sz, | |
16332 | + AuCpup_DTIME); | |
16333 | + if (!err) | |
16334 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
16335 | + } else if (!hi_wh) | |
16336 | + a->h_path.dentry = au_h_dptr(dentry, a->btgt); | |
16337 | + else | |
16338 | + a->h_path.dentry = hi_wh; /* do not dget here */ | |
1308ab2a | 16339 | + |
4f0767ce | 16340 | +out_unlock: |
4a4d8108 AM |
16341 | + mutex_unlock(&a->h_inode->i_mutex); |
16342 | + au_h_open_post(dentry, bstart, h_file); | |
16343 | + a->h_inode = a->h_path.dentry->d_inode; | |
dece6358 | 16344 | + if (!err) { |
4a4d8108 | 16345 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); |
dece6358 | 16346 | + goto out; /* success */ |
1facf9fc | 16347 | + } |
dece6358 | 16348 | + |
4a4d8108 | 16349 | + au_unpin(&a->pin); |
4f0767ce | 16350 | +out_parent: |
4a4d8108 AM |
16351 | + if (parent) { |
16352 | + di_write_unlock(parent); | |
16353 | + dput(parent); | |
16354 | + } | |
4f0767ce | 16355 | +out: |
1facf9fc | 16356 | + return err; |
16357 | +} | |
16358 | + | |
4a4d8108 | 16359 | +static int aufs_setattr(struct dentry *dentry, struct iattr *ia) |
1facf9fc | 16360 | +{ |
4a4d8108 AM |
16361 | + int err; |
16362 | + struct inode *inode; | |
16363 | + struct super_block *sb; | |
16364 | + struct file *file; | |
16365 | + struct au_icpup_args *a; | |
1facf9fc | 16366 | + |
4a4d8108 AM |
16367 | + inode = dentry->d_inode; |
16368 | + IMustLock(inode); | |
dece6358 | 16369 | + |
4a4d8108 AM |
16370 | + err = -ENOMEM; |
16371 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
16372 | + if (unlikely(!a)) | |
16373 | + goto out; | |
1facf9fc | 16374 | + |
4a4d8108 AM |
16375 | + if (ia->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) |
16376 | + ia->ia_valid &= ~ATTR_MODE; | |
dece6358 | 16377 | + |
4a4d8108 AM |
16378 | + file = NULL; |
16379 | + sb = dentry->d_sb; | |
e49829fe JR |
16380 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
16381 | + if (unlikely(err)) | |
16382 | + goto out_kfree; | |
16383 | + | |
4a4d8108 AM |
16384 | + if (ia->ia_valid & ATTR_FILE) { |
16385 | + /* currently ftruncate(2) only */ | |
16386 | + AuDebugOn(!S_ISREG(inode->i_mode)); | |
16387 | + file = ia->ia_file; | |
16388 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/1); | |
16389 | + if (unlikely(err)) | |
16390 | + goto out_si; | |
16391 | + ia->ia_file = au_hf_top(file); | |
16392 | + a->udba = AuOpt_UDBA_NONE; | |
16393 | + } else { | |
16394 | + /* fchmod() doesn't pass ia_file */ | |
16395 | + a->udba = au_opt_udba(sb); | |
027c5e7a AM |
16396 | + di_write_lock_child(dentry); |
16397 | + /* no d_unlinked(), to set UDBA_NONE for root */ | |
4a4d8108 AM |
16398 | + if (d_unhashed(dentry)) |
16399 | + a->udba = AuOpt_UDBA_NONE; | |
4a4d8108 AM |
16400 | + if (a->udba != AuOpt_UDBA_NONE) { |
16401 | + AuDebugOn(IS_ROOT(dentry)); | |
16402 | + err = au_reval_for_attr(dentry, au_sigen(sb)); | |
16403 | + if (unlikely(err)) | |
16404 | + goto out_dentry; | |
16405 | + } | |
dece6358 | 16406 | + } |
dece6358 | 16407 | + |
4a4d8108 AM |
16408 | + err = au_pin_and_icpup(dentry, ia, a); |
16409 | + if (unlikely(err < 0)) | |
16410 | + goto out_dentry; | |
16411 | + if (au_ftest_icpup(a->flags, DID_CPUP)) { | |
16412 | + ia->ia_file = NULL; | |
16413 | + ia->ia_valid &= ~ATTR_FILE; | |
1308ab2a | 16414 | + } |
dece6358 | 16415 | + |
4a4d8108 AM |
16416 | + a->h_path.mnt = au_sbr_mnt(sb, a->btgt); |
16417 | + if ((ia->ia_valid & (ATTR_MODE | ATTR_CTIME)) | |
16418 | + == (ATTR_MODE | ATTR_CTIME)) { | |
16419 | + err = security_path_chmod(a->h_path.dentry, a->h_path.mnt, | |
16420 | + ia->ia_mode); | |
16421 | + if (unlikely(err)) | |
16422 | + goto out_unlock; | |
16423 | + } else if ((ia->ia_valid & (ATTR_UID | ATTR_GID)) | |
16424 | + && (ia->ia_valid & ATTR_CTIME)) { | |
16425 | + err = security_path_chown(&a->h_path, ia->ia_uid, ia->ia_gid); | |
16426 | + if (unlikely(err)) | |
16427 | + goto out_unlock; | |
16428 | + } | |
dece6358 | 16429 | + |
4a4d8108 AM |
16430 | + if (ia->ia_valid & ATTR_SIZE) { |
16431 | + struct file *f; | |
1308ab2a | 16432 | + |
953406b4 | 16433 | + if (ia->ia_size < i_size_read(inode)) |
4a4d8108 | 16434 | + /* unmap only */ |
953406b4 | 16435 | + truncate_setsize(inode, ia->ia_size); |
1308ab2a | 16436 | + |
4a4d8108 AM |
16437 | + f = NULL; |
16438 | + if (ia->ia_valid & ATTR_FILE) | |
16439 | + f = ia->ia_file; | |
16440 | + mutex_unlock(&a->h_inode->i_mutex); | |
16441 | + err = vfsub_trunc(&a->h_path, ia->ia_size, ia->ia_valid, f); | |
16442 | + mutex_lock_nested(&a->h_inode->i_mutex, AuLsc_I_CHILD); | |
16443 | + } else | |
16444 | + err = vfsub_notify_change(&a->h_path, ia); | |
16445 | + if (!err) | |
16446 | + au_cpup_attr_changeable(inode); | |
1308ab2a | 16447 | + |
4f0767ce | 16448 | +out_unlock: |
4a4d8108 AM |
16449 | + mutex_unlock(&a->h_inode->i_mutex); |
16450 | + au_unpin(&a->pin); | |
027c5e7a AM |
16451 | + if (unlikely(err)) |
16452 | + au_update_dbstart(dentry); | |
4f0767ce | 16453 | +out_dentry: |
4a4d8108 AM |
16454 | + di_write_unlock(dentry); |
16455 | + if (file) { | |
16456 | + fi_write_unlock(file); | |
16457 | + ia->ia_file = file; | |
16458 | + ia->ia_valid |= ATTR_FILE; | |
16459 | + } | |
4f0767ce | 16460 | +out_si: |
4a4d8108 | 16461 | + si_read_unlock(sb); |
e49829fe | 16462 | +out_kfree: |
4a4d8108 | 16463 | + kfree(a); |
4f0767ce | 16464 | +out: |
4a4d8108 AM |
16465 | + AuTraceErr(err); |
16466 | + return err; | |
1facf9fc | 16467 | +} |
16468 | + | |
4a4d8108 AM |
16469 | +static void au_refresh_iattr(struct inode *inode, struct kstat *st, |
16470 | + unsigned int nlink) | |
1facf9fc | 16471 | +{ |
4a4d8108 AM |
16472 | + inode->i_mode = st->mode; |
16473 | + inode->i_uid = st->uid; | |
16474 | + inode->i_gid = st->gid; | |
16475 | + inode->i_atime = st->atime; | |
16476 | + inode->i_mtime = st->mtime; | |
16477 | + inode->i_ctime = st->ctime; | |
1facf9fc | 16478 | + |
4a4d8108 AM |
16479 | + au_cpup_attr_nlink(inode, /*force*/0); |
16480 | + if (S_ISDIR(inode->i_mode)) { | |
16481 | + inode->i_nlink -= nlink; | |
16482 | + inode->i_nlink += st->nlink; | |
16483 | + } | |
1facf9fc | 16484 | + |
4a4d8108 AM |
16485 | + spin_lock(&inode->i_lock); |
16486 | + inode->i_blocks = st->blocks; | |
16487 | + i_size_write(inode, st->size); | |
16488 | + spin_unlock(&inode->i_lock); | |
1facf9fc | 16489 | +} |
16490 | + | |
4a4d8108 AM |
16491 | +static int aufs_getattr(struct vfsmount *mnt __maybe_unused, |
16492 | + struct dentry *dentry, struct kstat *st) | |
1facf9fc | 16493 | +{ |
4a4d8108 AM |
16494 | + int err; |
16495 | + unsigned int mnt_flags; | |
16496 | + aufs_bindex_t bindex; | |
16497 | + unsigned char udba_none, positive; | |
16498 | + struct super_block *sb, *h_sb; | |
16499 | + struct inode *inode; | |
16500 | + struct vfsmount *h_mnt; | |
16501 | + struct dentry *h_dentry; | |
1facf9fc | 16502 | + |
4a4d8108 AM |
16503 | + sb = dentry->d_sb; |
16504 | + inode = dentry->d_inode; | |
7f207e10 AM |
16505 | + err = si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
16506 | + if (unlikely(err)) | |
16507 | + goto out; | |
4a4d8108 AM |
16508 | + mnt_flags = au_mntflags(sb); |
16509 | + udba_none = !!au_opt_test(mnt_flags, UDBA_NONE); | |
1facf9fc | 16510 | + |
4a4d8108 | 16511 | + /* support fstat(2) */ |
027c5e7a | 16512 | + if (!d_unlinked(dentry) && !udba_none) { |
4a4d8108 | 16513 | + unsigned int sigen = au_sigen(sb); |
027c5e7a AM |
16514 | + err = au_digen_test(dentry, sigen); |
16515 | + if (!err) { | |
4a4d8108 | 16516 | + di_read_lock_child(dentry, AuLock_IR); |
027c5e7a AM |
16517 | + err = au_dbrange_test(dentry); |
16518 | + if (unlikely(err)) | |
16519 | + goto out_unlock; | |
16520 | + } else { | |
4a4d8108 AM |
16521 | + AuDebugOn(IS_ROOT(dentry)); |
16522 | + di_write_lock_child(dentry); | |
027c5e7a AM |
16523 | + err = au_dbrange_test(dentry); |
16524 | + if (!err) | |
16525 | + err = au_reval_for_attr(dentry, sigen); | |
4a4d8108 AM |
16526 | + di_downgrade_lock(dentry, AuLock_IR); |
16527 | + if (unlikely(err)) | |
7f207e10 | 16528 | + goto out_unlock; |
4a4d8108 AM |
16529 | + } |
16530 | + } else | |
16531 | + di_read_lock_child(dentry, AuLock_IR); | |
1facf9fc | 16532 | + |
4a4d8108 AM |
16533 | + bindex = au_ibstart(inode); |
16534 | + h_mnt = au_sbr_mnt(sb, bindex); | |
16535 | + h_sb = h_mnt->mnt_sb; | |
16536 | + if (!au_test_fs_bad_iattr(h_sb) && udba_none) | |
16537 | + goto out_fill; /* success */ | |
1facf9fc | 16538 | + |
4a4d8108 AM |
16539 | + h_dentry = NULL; |
16540 | + if (au_dbstart(dentry) == bindex) | |
16541 | + h_dentry = dget(au_h_dptr(dentry, bindex)); | |
16542 | + else if (au_opt_test(mnt_flags, PLINK) && au_plink_test(inode)) { | |
16543 | + h_dentry = au_plink_lkup(inode, bindex); | |
16544 | + if (IS_ERR(h_dentry)) | |
16545 | + goto out_fill; /* pretending success */ | |
16546 | + } | |
16547 | + /* illegally overlapped or something */ | |
16548 | + if (unlikely(!h_dentry)) | |
16549 | + goto out_fill; /* pretending success */ | |
16550 | + | |
16551 | + positive = !!h_dentry->d_inode; | |
16552 | + if (positive) | |
16553 | + err = vfs_getattr(h_mnt, h_dentry, st); | |
16554 | + dput(h_dentry); | |
16555 | + if (!err) { | |
16556 | + if (positive) | |
16557 | + au_refresh_iattr(inode, st, h_dentry->d_inode->i_nlink); | |
16558 | + goto out_fill; /* success */ | |
1facf9fc | 16559 | + } |
7f207e10 AM |
16560 | + AuTraceErr(err); |
16561 | + goto out_unlock; | |
4a4d8108 | 16562 | + |
4f0767ce | 16563 | +out_fill: |
4a4d8108 | 16564 | + generic_fillattr(inode, st); |
7f207e10 | 16565 | +out_unlock: |
4a4d8108 AM |
16566 | + di_read_unlock(dentry, AuLock_IR); |
16567 | + si_read_unlock(sb); | |
7f207e10 AM |
16568 | +out: |
16569 | + AuTraceErr(err); | |
4a4d8108 | 16570 | + return err; |
1facf9fc | 16571 | +} |
16572 | + | |
16573 | +/* ---------------------------------------------------------------------- */ | |
16574 | + | |
4a4d8108 AM |
16575 | +static int h_readlink(struct dentry *dentry, int bindex, char __user *buf, |
16576 | + int bufsiz) | |
1facf9fc | 16577 | +{ |
16578 | + int err; | |
4a4d8108 AM |
16579 | + struct super_block *sb; |
16580 | + struct dentry *h_dentry; | |
1facf9fc | 16581 | + |
4a4d8108 AM |
16582 | + err = -EINVAL; |
16583 | + h_dentry = au_h_dptr(dentry, bindex); | |
16584 | + if (unlikely(!h_dentry->d_inode->i_op->readlink)) | |
16585 | + goto out; | |
1facf9fc | 16586 | + |
4a4d8108 AM |
16587 | + err = security_inode_readlink(h_dentry); |
16588 | + if (unlikely(err)) | |
dece6358 | 16589 | + goto out; |
1facf9fc | 16590 | + |
4a4d8108 AM |
16591 | + sb = dentry->d_sb; |
16592 | + if (!au_test_ro(sb, bindex, dentry->d_inode)) { | |
16593 | + vfsub_touch_atime(au_sbr_mnt(sb, bindex), h_dentry); | |
16594 | + fsstack_copy_attr_atime(dentry->d_inode, h_dentry->d_inode); | |
1facf9fc | 16595 | + } |
4a4d8108 | 16596 | + err = h_dentry->d_inode->i_op->readlink(h_dentry, buf, bufsiz); |
1facf9fc | 16597 | + |
4f0767ce | 16598 | +out: |
4a4d8108 AM |
16599 | + return err; |
16600 | +} | |
1facf9fc | 16601 | + |
4a4d8108 AM |
16602 | +static int aufs_readlink(struct dentry *dentry, char __user *buf, int bufsiz) |
16603 | +{ | |
16604 | + int err; | |
1facf9fc | 16605 | + |
027c5e7a AM |
16606 | + err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN); |
16607 | + if (unlikely(err)) | |
16608 | + goto out; | |
16609 | + err = au_d_hashed_positive(dentry); | |
16610 | + if (!err) | |
16611 | + err = h_readlink(dentry, au_dbstart(dentry), buf, bufsiz); | |
4a4d8108 | 16612 | + aufs_read_unlock(dentry, AuLock_IR); |
1facf9fc | 16613 | + |
027c5e7a | 16614 | +out: |
4a4d8108 AM |
16615 | + return err; |
16616 | +} | |
1facf9fc | 16617 | + |
4a4d8108 AM |
16618 | +static void *aufs_follow_link(struct dentry *dentry, struct nameidata *nd) |
16619 | +{ | |
16620 | + int err; | |
4a4d8108 | 16621 | + mm_segment_t old_fs; |
b752ccd1 AM |
16622 | + union { |
16623 | + char *k; | |
16624 | + char __user *u; | |
16625 | + } buf; | |
1facf9fc | 16626 | + |
4a4d8108 | 16627 | + err = -ENOMEM; |
b752ccd1 AM |
16628 | + buf.k = __getname_gfp(GFP_NOFS); |
16629 | + if (unlikely(!buf.k)) | |
4a4d8108 | 16630 | + goto out; |
1facf9fc | 16631 | + |
027c5e7a AM |
16632 | + err = aufs_read_lock(dentry, AuLock_IR | AuLock_GEN); |
16633 | + if (unlikely(err)) | |
16634 | + goto out_name; | |
16635 | + | |
16636 | + err = au_d_hashed_positive(dentry); | |
16637 | + if (!err) { | |
16638 | + old_fs = get_fs(); | |
16639 | + set_fs(KERNEL_DS); | |
16640 | + err = h_readlink(dentry, au_dbstart(dentry), buf.u, PATH_MAX); | |
16641 | + set_fs(old_fs); | |
16642 | + } | |
4a4d8108 | 16643 | + aufs_read_unlock(dentry, AuLock_IR); |
1facf9fc | 16644 | + |
4a4d8108 | 16645 | + if (err >= 0) { |
b752ccd1 | 16646 | + buf.k[err] = 0; |
4a4d8108 | 16647 | + /* will be freed by put_link */ |
b752ccd1 | 16648 | + nd_set_link(nd, buf.k); |
4a4d8108 | 16649 | + return NULL; /* success */ |
1308ab2a | 16650 | + } |
1facf9fc | 16651 | + |
027c5e7a AM |
16652 | +out_name: |
16653 | + __putname(buf.k); | |
4f0767ce | 16654 | +out: |
4a4d8108 AM |
16655 | + path_put(&nd->path); |
16656 | + AuTraceErr(err); | |
16657 | + return ERR_PTR(err); | |
16658 | +} | |
1facf9fc | 16659 | + |
4a4d8108 AM |
16660 | +static void aufs_put_link(struct dentry *dentry __maybe_unused, |
16661 | + struct nameidata *nd, void *cookie __maybe_unused) | |
16662 | +{ | |
16663 | + __putname(nd_get_link(nd)); | |
16664 | +} | |
1facf9fc | 16665 | + |
4a4d8108 | 16666 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 16667 | + |
4a4d8108 AM |
16668 | +static void aufs_truncate_range(struct inode *inode __maybe_unused, |
16669 | + loff_t start __maybe_unused, | |
16670 | + loff_t end __maybe_unused) | |
16671 | +{ | |
16672 | + AuUnsupport(); | |
16673 | +} | |
1facf9fc | 16674 | + |
4a4d8108 | 16675 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 16676 | + |
4a4d8108 AM |
16677 | +struct inode_operations aufs_symlink_iop = { |
16678 | + .permission = aufs_permission, | |
16679 | + .setattr = aufs_setattr, | |
16680 | + .getattr = aufs_getattr, | |
16681 | + .readlink = aufs_readlink, | |
16682 | + .follow_link = aufs_follow_link, | |
16683 | + .put_link = aufs_put_link | |
16684 | +}; | |
16685 | + | |
16686 | +struct inode_operations aufs_dir_iop = { | |
16687 | + .create = aufs_create, | |
16688 | + .lookup = aufs_lookup, | |
16689 | + .link = aufs_link, | |
16690 | + .unlink = aufs_unlink, | |
16691 | + .symlink = aufs_symlink, | |
16692 | + .mkdir = aufs_mkdir, | |
16693 | + .rmdir = aufs_rmdir, | |
16694 | + .mknod = aufs_mknod, | |
16695 | + .rename = aufs_rename, | |
16696 | + | |
16697 | + .permission = aufs_permission, | |
16698 | + .setattr = aufs_setattr, | |
16699 | + .getattr = aufs_getattr | |
16700 | +}; | |
16701 | + | |
16702 | +struct inode_operations aufs_iop = { | |
16703 | + .permission = aufs_permission, | |
16704 | + .setattr = aufs_setattr, | |
16705 | + .getattr = aufs_getattr, | |
16706 | + .truncate_range = aufs_truncate_range | |
16707 | +}; | |
7f207e10 AM |
16708 | diff -urN /usr/share/empty/fs/aufs/i_op_del.c linux/fs/aufs/i_op_del.c |
16709 | --- /usr/share/empty/fs/aufs/i_op_del.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
16710 | +++ linux/fs/aufs/i_op_del.c 2011-08-24 13:30:24.731313534 +0200 |
16711 | @@ -0,0 +1,478 @@ | |
1facf9fc | 16712 | +/* |
027c5e7a | 16713 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 16714 | + * |
16715 | + * This program, aufs is free software; you can redistribute it and/or modify | |
16716 | + * it under the terms of the GNU General Public License as published by | |
16717 | + * the Free Software Foundation; either version 2 of the License, or | |
16718 | + * (at your option) any later version. | |
dece6358 AM |
16719 | + * |
16720 | + * This program is distributed in the hope that it will be useful, | |
16721 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16722 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
16723 | + * GNU General Public License for more details. | |
16724 | + * | |
16725 | + * You should have received a copy of the GNU General Public License | |
16726 | + * along with this program; if not, write to the Free Software | |
16727 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 16728 | + */ |
16729 | + | |
16730 | +/* | |
4a4d8108 | 16731 | + * inode operations (del entry) |
1308ab2a | 16732 | + */ |
dece6358 | 16733 | + |
1308ab2a | 16734 | +#include "aufs.h" |
dece6358 | 16735 | + |
4a4d8108 AM |
16736 | +/* |
16737 | + * decide if a new whiteout for @dentry is necessary or not. | |
16738 | + * when it is necessary, prepare the parent dir for the upper branch whose | |
16739 | + * branch index is @bcpup for creation. the actual creation of the whiteout will | |
16740 | + * be done by caller. | |
16741 | + * return value: | |
16742 | + * 0: wh is unnecessary | |
16743 | + * plus: wh is necessary | |
16744 | + * minus: error | |
16745 | + */ | |
16746 | +int au_wr_dir_need_wh(struct dentry *dentry, int isdir, aufs_bindex_t *bcpup) | |
1308ab2a | 16747 | +{ |
4a4d8108 AM |
16748 | + int need_wh, err; |
16749 | + aufs_bindex_t bstart; | |
16750 | + struct super_block *sb; | |
dece6358 | 16751 | + |
4a4d8108 AM |
16752 | + sb = dentry->d_sb; |
16753 | + bstart = au_dbstart(dentry); | |
16754 | + if (*bcpup < 0) { | |
16755 | + *bcpup = bstart; | |
16756 | + if (au_test_ro(sb, bstart, dentry->d_inode)) { | |
16757 | + err = AuWbrCopyup(au_sbi(sb), dentry); | |
16758 | + *bcpup = err; | |
16759 | + if (unlikely(err < 0)) | |
16760 | + goto out; | |
16761 | + } | |
16762 | + } else | |
16763 | + AuDebugOn(bstart < *bcpup | |
16764 | + || au_test_ro(sb, *bcpup, dentry->d_inode)); | |
16765 | + AuDbg("bcpup %d, bstart %d\n", *bcpup, bstart); | |
1308ab2a | 16766 | + |
4a4d8108 AM |
16767 | + if (*bcpup != bstart) { |
16768 | + err = au_cpup_dirs(dentry, *bcpup); | |
16769 | + if (unlikely(err)) | |
16770 | + goto out; | |
16771 | + need_wh = 1; | |
16772 | + } else { | |
027c5e7a | 16773 | + struct au_dinfo *dinfo, *tmp; |
4a4d8108 | 16774 | + |
027c5e7a AM |
16775 | + need_wh = -ENOMEM; |
16776 | + dinfo = au_di(dentry); | |
16777 | + tmp = au_di_alloc(sb, AuLsc_DI_TMP); | |
16778 | + if (tmp) { | |
16779 | + au_di_cp(tmp, dinfo); | |
16780 | + au_di_swap(tmp, dinfo); | |
16781 | + /* returns the number of positive dentries */ | |
16782 | + need_wh = au_lkup_dentry(dentry, bstart + 1, /*type*/0, | |
16783 | + /*nd*/NULL); | |
16784 | + au_di_swap(tmp, dinfo); | |
16785 | + au_rw_write_unlock(&tmp->di_rwsem); | |
16786 | + au_di_free(tmp); | |
4a4d8108 AM |
16787 | + } |
16788 | + } | |
16789 | + AuDbg("need_wh %d\n", need_wh); | |
16790 | + err = need_wh; | |
16791 | + | |
4f0767ce | 16792 | +out: |
4a4d8108 | 16793 | + return err; |
1facf9fc | 16794 | +} |
16795 | + | |
4a4d8108 AM |
16796 | +/* |
16797 | + * simple tests for the del-entry operations. | |
16798 | + * following the checks in vfs, plus the parent-child relationship. | |
16799 | + */ | |
16800 | +int au_may_del(struct dentry *dentry, aufs_bindex_t bindex, | |
16801 | + struct dentry *h_parent, int isdir) | |
1facf9fc | 16802 | +{ |
4a4d8108 AM |
16803 | + int err; |
16804 | + umode_t h_mode; | |
16805 | + struct dentry *h_dentry, *h_latest; | |
1308ab2a | 16806 | + struct inode *h_inode; |
1facf9fc | 16807 | + |
4a4d8108 AM |
16808 | + h_dentry = au_h_dptr(dentry, bindex); |
16809 | + h_inode = h_dentry->d_inode; | |
16810 | + if (dentry->d_inode) { | |
16811 | + err = -ENOENT; | |
16812 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
16813 | + goto out; | |
1facf9fc | 16814 | + |
4a4d8108 AM |
16815 | + h_mode = h_inode->i_mode; |
16816 | + if (!isdir) { | |
16817 | + err = -EISDIR; | |
16818 | + if (unlikely(S_ISDIR(h_mode))) | |
16819 | + goto out; | |
16820 | + } else if (unlikely(!S_ISDIR(h_mode))) { | |
16821 | + err = -ENOTDIR; | |
16822 | + goto out; | |
16823 | + } | |
16824 | + } else { | |
16825 | + /* rename(2) case */ | |
16826 | + err = -EIO; | |
16827 | + if (unlikely(h_inode)) | |
16828 | + goto out; | |
16829 | + } | |
1facf9fc | 16830 | + |
4a4d8108 AM |
16831 | + err = -ENOENT; |
16832 | + /* expected parent dir is locked */ | |
16833 | + if (unlikely(h_parent != h_dentry->d_parent)) | |
16834 | + goto out; | |
16835 | + err = 0; | |
16836 | + | |
16837 | + /* | |
16838 | + * rmdir a dir may break the consistency on some filesystem. | |
16839 | + * let's try heavy test. | |
16840 | + */ | |
16841 | + err = -EACCES; | |
16842 | + if (unlikely(au_test_h_perm(h_parent->d_inode, MAY_EXEC | MAY_WRITE))) | |
16843 | + goto out; | |
16844 | + | |
16845 | + h_latest = au_sio_lkup_one(&dentry->d_name, h_parent, | |
16846 | + au_sbr(dentry->d_sb, bindex)); | |
16847 | + err = -EIO; | |
16848 | + if (IS_ERR(h_latest)) | |
16849 | + goto out; | |
16850 | + if (h_latest == h_dentry) | |
16851 | + err = 0; | |
16852 | + dput(h_latest); | |
16853 | + | |
4f0767ce | 16854 | +out: |
4a4d8108 | 16855 | + return err; |
1308ab2a | 16856 | +} |
1facf9fc | 16857 | + |
4a4d8108 AM |
16858 | +/* |
16859 | + * decide the branch where we operate for @dentry. the branch index will be set | |
16860 | + * @rbcpup. after diciding it, 'pin' it and store the timestamps of the parent | |
16861 | + * dir for reverting. | |
16862 | + * when a new whiteout is necessary, create it. | |
16863 | + */ | |
16864 | +static struct dentry* | |
16865 | +lock_hdir_create_wh(struct dentry *dentry, int isdir, aufs_bindex_t *rbcpup, | |
16866 | + struct au_dtime *dt, struct au_pin *pin) | |
1308ab2a | 16867 | +{ |
4a4d8108 AM |
16868 | + struct dentry *wh_dentry; |
16869 | + struct super_block *sb; | |
16870 | + struct path h_path; | |
16871 | + int err, need_wh; | |
16872 | + unsigned int udba; | |
16873 | + aufs_bindex_t bcpup; | |
dece6358 | 16874 | + |
4a4d8108 AM |
16875 | + need_wh = au_wr_dir_need_wh(dentry, isdir, rbcpup); |
16876 | + wh_dentry = ERR_PTR(need_wh); | |
16877 | + if (unlikely(need_wh < 0)) | |
16878 | + goto out; | |
16879 | + | |
16880 | + sb = dentry->d_sb; | |
16881 | + udba = au_opt_udba(sb); | |
16882 | + bcpup = *rbcpup; | |
16883 | + err = au_pin(pin, dentry, bcpup, udba, | |
16884 | + AuPin_DI_LOCKED | AuPin_MNT_WRITE); | |
16885 | + wh_dentry = ERR_PTR(err); | |
16886 | + if (unlikely(err)) | |
16887 | + goto out; | |
16888 | + | |
16889 | + h_path.dentry = au_pinned_h_parent(pin); | |
16890 | + if (udba != AuOpt_UDBA_NONE | |
16891 | + && au_dbstart(dentry) == bcpup) { | |
16892 | + err = au_may_del(dentry, bcpup, h_path.dentry, isdir); | |
16893 | + wh_dentry = ERR_PTR(err); | |
16894 | + if (unlikely(err)) | |
16895 | + goto out_unpin; | |
16896 | + } | |
16897 | + | |
16898 | + h_path.mnt = au_sbr_mnt(sb, bcpup); | |
16899 | + au_dtime_store(dt, au_pinned_parent(pin), &h_path); | |
16900 | + wh_dentry = NULL; | |
16901 | + if (!need_wh) | |
16902 | + goto out; /* success, no need to create whiteout */ | |
16903 | + | |
16904 | + wh_dentry = au_wh_create(dentry, bcpup, h_path.dentry); | |
16905 | + if (IS_ERR(wh_dentry)) | |
16906 | + goto out_unpin; | |
16907 | + | |
16908 | + /* returns with the parent is locked and wh_dentry is dget-ed */ | |
16909 | + goto out; /* success */ | |
16910 | + | |
4f0767ce | 16911 | +out_unpin: |
4a4d8108 | 16912 | + au_unpin(pin); |
4f0767ce | 16913 | +out: |
4a4d8108 | 16914 | + return wh_dentry; |
1facf9fc | 16915 | +} |
16916 | + | |
4a4d8108 AM |
16917 | +/* |
16918 | + * when removing a dir, rename it to a unique temporary whiteout-ed name first | |
16919 | + * in order to be revertible and save time for removing many child whiteouts | |
16920 | + * under the dir. | |
16921 | + * returns 1 when there are too many child whiteout and caller should remove | |
16922 | + * them asynchronously. returns 0 when the number of children is enough small to | |
16923 | + * remove now or the branch fs is a remote fs. | |
16924 | + * otherwise return an error. | |
16925 | + */ | |
16926 | +static int renwh_and_rmdir(struct dentry *dentry, aufs_bindex_t bindex, | |
16927 | + struct au_nhash *whlist, struct inode *dir) | |
1facf9fc | 16928 | +{ |
4a4d8108 AM |
16929 | + int rmdir_later, err, dirwh; |
16930 | + struct dentry *h_dentry; | |
16931 | + struct super_block *sb; | |
16932 | + | |
16933 | + sb = dentry->d_sb; | |
16934 | + SiMustAnyLock(sb); | |
16935 | + h_dentry = au_h_dptr(dentry, bindex); | |
16936 | + err = au_whtmp_ren(h_dentry, au_sbr(sb, bindex)); | |
16937 | + if (unlikely(err)) | |
16938 | + goto out; | |
16939 | + | |
16940 | + /* stop monitoring */ | |
16941 | + au_hn_free(au_hi(dentry->d_inode, bindex)); | |
16942 | + | |
16943 | + if (!au_test_fs_remote(h_dentry->d_sb)) { | |
16944 | + dirwh = au_sbi(sb)->si_dirwh; | |
16945 | + rmdir_later = (dirwh <= 1); | |
16946 | + if (!rmdir_later) | |
16947 | + rmdir_later = au_nhash_test_longer_wh(whlist, bindex, | |
16948 | + dirwh); | |
16949 | + if (rmdir_later) | |
16950 | + return rmdir_later; | |
16951 | + } | |
1facf9fc | 16952 | + |
4a4d8108 AM |
16953 | + err = au_whtmp_rmdir(dir, bindex, h_dentry, whlist); |
16954 | + if (unlikely(err)) { | |
16955 | + AuIOErr("rmdir %.*s, b%d failed, %d. ignored\n", | |
16956 | + AuDLNPair(h_dentry), bindex, err); | |
16957 | + err = 0; | |
16958 | + } | |
dece6358 | 16959 | + |
4f0767ce | 16960 | +out: |
4a4d8108 AM |
16961 | + AuTraceErr(err); |
16962 | + return err; | |
16963 | +} | |
1308ab2a | 16964 | + |
4a4d8108 AM |
16965 | +/* |
16966 | + * final procedure for deleting a entry. | |
16967 | + * maintain dentry and iattr. | |
16968 | + */ | |
16969 | +static void epilog(struct inode *dir, struct dentry *dentry, | |
16970 | + aufs_bindex_t bindex) | |
16971 | +{ | |
16972 | + struct inode *inode; | |
1308ab2a | 16973 | + |
4a4d8108 AM |
16974 | + inode = dentry->d_inode; |
16975 | + d_drop(dentry); | |
16976 | + inode->i_ctime = dir->i_ctime; | |
1308ab2a | 16977 | + |
4a4d8108 AM |
16978 | + if (au_ibstart(dir) == bindex) |
16979 | + au_cpup_attr_timesizes(dir); | |
16980 | + dir->i_version++; | |
1facf9fc | 16981 | +} |
16982 | + | |
4a4d8108 AM |
16983 | +/* |
16984 | + * when an error happened, remove the created whiteout and revert everything. | |
16985 | + */ | |
7f207e10 AM |
16986 | +static int do_revert(int err, struct inode *dir, aufs_bindex_t bindex, |
16987 | + aufs_bindex_t bwh, struct dentry *wh_dentry, | |
16988 | + struct dentry *dentry, struct au_dtime *dt) | |
1facf9fc | 16989 | +{ |
4a4d8108 AM |
16990 | + int rerr; |
16991 | + struct path h_path = { | |
16992 | + .dentry = wh_dentry, | |
7f207e10 | 16993 | + .mnt = au_sbr_mnt(dir->i_sb, bindex) |
4a4d8108 | 16994 | + }; |
dece6358 | 16995 | + |
7f207e10 | 16996 | + rerr = au_wh_unlink_dentry(au_h_iptr(dir, bindex), &h_path, dentry); |
4a4d8108 AM |
16997 | + if (!rerr) { |
16998 | + au_set_dbwh(dentry, bwh); | |
16999 | + au_dtime_revert(dt); | |
17000 | + return 0; | |
17001 | + } | |
dece6358 | 17002 | + |
4a4d8108 AM |
17003 | + AuIOErr("%.*s reverting whiteout failed(%d, %d)\n", |
17004 | + AuDLNPair(dentry), err, rerr); | |
17005 | + return -EIO; | |
1facf9fc | 17006 | +} |
17007 | + | |
4a4d8108 | 17008 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17009 | + |
4a4d8108 | 17010 | +int aufs_unlink(struct inode *dir, struct dentry *dentry) |
1308ab2a | 17011 | +{ |
4a4d8108 AM |
17012 | + int err; |
17013 | + aufs_bindex_t bwh, bindex, bstart; | |
17014 | + struct au_dtime dt; | |
17015 | + struct au_pin pin; | |
17016 | + struct path h_path; | |
17017 | + struct inode *inode, *h_dir; | |
17018 | + struct dentry *parent, *wh_dentry; | |
1facf9fc | 17019 | + |
4a4d8108 | 17020 | + IMustLock(dir); |
027c5e7a AM |
17021 | + |
17022 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_GEN); | |
17023 | + if (unlikely(err)) | |
17024 | + goto out; | |
17025 | + err = au_d_hashed_positive(dentry); | |
17026 | + if (unlikely(err)) | |
17027 | + goto out_unlock; | |
4a4d8108 | 17028 | + inode = dentry->d_inode; |
4a4d8108 | 17029 | + IMustLock(inode); |
027c5e7a AM |
17030 | + err = -EISDIR; |
17031 | + if (unlikely(S_ISDIR(inode->i_mode))) | |
17032 | + goto out_unlock; /* possible? */ | |
1facf9fc | 17033 | + |
4a4d8108 AM |
17034 | + bstart = au_dbstart(dentry); |
17035 | + bwh = au_dbwh(dentry); | |
17036 | + bindex = -1; | |
027c5e7a AM |
17037 | + parent = dentry->d_parent; /* dir inode is locked */ |
17038 | + di_write_lock_parent(parent); | |
4a4d8108 AM |
17039 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/0, &bindex, &dt, &pin); |
17040 | + err = PTR_ERR(wh_dentry); | |
17041 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 17042 | + goto out_parent; |
1facf9fc | 17043 | + |
4a4d8108 AM |
17044 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bstart); |
17045 | + h_path.dentry = au_h_dptr(dentry, bstart); | |
17046 | + dget(h_path.dentry); | |
17047 | + if (bindex == bstart) { | |
17048 | + h_dir = au_pinned_h_dir(&pin); | |
17049 | + err = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
17050 | + } else { | |
17051 | + /* dir inode is locked */ | |
17052 | + h_dir = wh_dentry->d_parent->d_inode; | |
17053 | + IMustLock(h_dir); | |
17054 | + err = 0; | |
17055 | + } | |
dece6358 | 17056 | + |
4a4d8108 | 17057 | + if (!err) { |
7f207e10 | 17058 | + vfsub_drop_nlink(inode); |
4a4d8108 AM |
17059 | + epilog(dir, dentry, bindex); |
17060 | + | |
17061 | + /* update target timestamps */ | |
17062 | + if (bindex == bstart) { | |
17063 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ | |
17064 | + inode->i_ctime = h_path.dentry->d_inode->i_ctime; | |
17065 | + } else | |
17066 | + /* todo: this timestamp may be reverted later */ | |
17067 | + inode->i_ctime = h_dir->i_ctime; | |
027c5e7a | 17068 | + goto out_unpin; /* success */ |
1facf9fc | 17069 | + } |
17070 | + | |
4a4d8108 AM |
17071 | + /* revert */ |
17072 | + if (wh_dentry) { | |
17073 | + int rerr; | |
17074 | + | |
7f207e10 | 17075 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt); |
4a4d8108 AM |
17076 | + if (rerr) |
17077 | + err = rerr; | |
dece6358 | 17078 | + } |
1facf9fc | 17079 | + |
027c5e7a | 17080 | +out_unpin: |
4a4d8108 AM |
17081 | + au_unpin(&pin); |
17082 | + dput(wh_dentry); | |
17083 | + dput(h_path.dentry); | |
027c5e7a | 17084 | +out_parent: |
4a4d8108 | 17085 | + di_write_unlock(parent); |
027c5e7a | 17086 | +out_unlock: |
4a4d8108 | 17087 | + aufs_read_unlock(dentry, AuLock_DW); |
027c5e7a | 17088 | +out: |
4a4d8108 | 17089 | + return err; |
dece6358 AM |
17090 | +} |
17091 | + | |
4a4d8108 | 17092 | +int aufs_rmdir(struct inode *dir, struct dentry *dentry) |
1308ab2a | 17093 | +{ |
4a4d8108 AM |
17094 | + int err, rmdir_later; |
17095 | + aufs_bindex_t bwh, bindex, bstart; | |
17096 | + struct au_dtime dt; | |
17097 | + struct au_pin pin; | |
17098 | + struct inode *inode; | |
17099 | + struct dentry *parent, *wh_dentry, *h_dentry; | |
17100 | + struct au_whtmp_rmdir *args; | |
1facf9fc | 17101 | + |
4a4d8108 | 17102 | + IMustLock(dir); |
027c5e7a AM |
17103 | + |
17104 | + err = aufs_read_lock(dentry, AuLock_DW | AuLock_FLUSH | AuLock_GEN); | |
17105 | + if (unlikely(err)) | |
4a4d8108 | 17106 | + goto out; |
53392da6 AM |
17107 | + err = au_alive_dir(dentry); |
17108 | + if (unlikely(err)) | |
027c5e7a | 17109 | + goto out_unlock; |
53392da6 | 17110 | + inode = dentry->d_inode; |
4a4d8108 | 17111 | + IMustLock(inode); |
027c5e7a AM |
17112 | + err = -ENOTDIR; |
17113 | + if (unlikely(!S_ISDIR(inode->i_mode))) | |
17114 | + goto out_unlock; /* possible? */ | |
dece6358 | 17115 | + |
4a4d8108 AM |
17116 | + err = -ENOMEM; |
17117 | + args = au_whtmp_rmdir_alloc(dir->i_sb, GFP_NOFS); | |
17118 | + if (unlikely(!args)) | |
17119 | + goto out_unlock; | |
dece6358 | 17120 | + |
4a4d8108 AM |
17121 | + parent = dentry->d_parent; /* dir inode is locked */ |
17122 | + di_write_lock_parent(parent); | |
17123 | + err = au_test_empty(dentry, &args->whlist); | |
17124 | + if (unlikely(err)) | |
027c5e7a | 17125 | + goto out_parent; |
1facf9fc | 17126 | + |
4a4d8108 AM |
17127 | + bstart = au_dbstart(dentry); |
17128 | + bwh = au_dbwh(dentry); | |
17129 | + bindex = -1; | |
17130 | + wh_dentry = lock_hdir_create_wh(dentry, /*isdir*/1, &bindex, &dt, &pin); | |
17131 | + err = PTR_ERR(wh_dentry); | |
17132 | + if (IS_ERR(wh_dentry)) | |
027c5e7a | 17133 | + goto out_parent; |
1facf9fc | 17134 | + |
4a4d8108 AM |
17135 | + h_dentry = au_h_dptr(dentry, bstart); |
17136 | + dget(h_dentry); | |
17137 | + rmdir_later = 0; | |
17138 | + if (bindex == bstart) { | |
17139 | + err = renwh_and_rmdir(dentry, bstart, &args->whlist, dir); | |
17140 | + if (err > 0) { | |
17141 | + rmdir_later = err; | |
17142 | + err = 0; | |
17143 | + } | |
17144 | + } else { | |
17145 | + /* stop monitoring */ | |
17146 | + au_hn_free(au_hi(inode, bstart)); | |
17147 | + | |
17148 | + /* dir inode is locked */ | |
17149 | + IMustLock(wh_dentry->d_parent->d_inode); | |
1facf9fc | 17150 | + err = 0; |
17151 | + } | |
17152 | + | |
4a4d8108 | 17153 | + if (!err) { |
027c5e7a | 17154 | + vfsub_dead_dir(inode); |
4a4d8108 AM |
17155 | + au_set_dbdiropq(dentry, -1); |
17156 | + epilog(dir, dentry, bindex); | |
1308ab2a | 17157 | + |
4a4d8108 AM |
17158 | + if (rmdir_later) { |
17159 | + au_whtmp_kick_rmdir(dir, bstart, h_dentry, args); | |
17160 | + args = NULL; | |
17161 | + } | |
1308ab2a | 17162 | + |
4a4d8108 | 17163 | + goto out_unpin; /* success */ |
1facf9fc | 17164 | + } |
17165 | + | |
4a4d8108 AM |
17166 | + /* revert */ |
17167 | + AuLabel(revert); | |
17168 | + if (wh_dentry) { | |
17169 | + int rerr; | |
1308ab2a | 17170 | + |
7f207e10 | 17171 | + rerr = do_revert(err, dir, bindex, bwh, wh_dentry, dentry, &dt); |
4a4d8108 AM |
17172 | + if (rerr) |
17173 | + err = rerr; | |
1facf9fc | 17174 | + } |
17175 | + | |
4f0767ce | 17176 | +out_unpin: |
4a4d8108 AM |
17177 | + au_unpin(&pin); |
17178 | + dput(wh_dentry); | |
17179 | + dput(h_dentry); | |
027c5e7a | 17180 | +out_parent: |
4a4d8108 AM |
17181 | + di_write_unlock(parent); |
17182 | + if (args) | |
17183 | + au_whtmp_rmdir_free(args); | |
4f0767ce | 17184 | +out_unlock: |
4a4d8108 | 17185 | + aufs_read_unlock(dentry, AuLock_DW); |
4f0767ce | 17186 | +out: |
4a4d8108 AM |
17187 | + AuTraceErr(err); |
17188 | + return err; | |
dece6358 | 17189 | +} |
7f207e10 AM |
17190 | diff -urN /usr/share/empty/fs/aufs/i_op_ren.c linux/fs/aufs/i_op_ren.c |
17191 | --- /usr/share/empty/fs/aufs/i_op_ren.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 17192 | +++ linux/fs/aufs/i_op_ren.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 17193 | @@ -0,0 +1,1017 @@ |
1facf9fc | 17194 | +/* |
027c5e7a | 17195 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 17196 | + * |
17197 | + * This program, aufs is free software; you can redistribute it and/or modify | |
17198 | + * it under the terms of the GNU General Public License as published by | |
17199 | + * the Free Software Foundation; either version 2 of the License, or | |
17200 | + * (at your option) any later version. | |
dece6358 AM |
17201 | + * |
17202 | + * This program is distributed in the hope that it will be useful, | |
17203 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17204 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17205 | + * GNU General Public License for more details. | |
17206 | + * | |
17207 | + * You should have received a copy of the GNU General Public License | |
17208 | + * along with this program; if not, write to the Free Software | |
17209 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 17210 | + */ |
17211 | + | |
17212 | +/* | |
4a4d8108 AM |
17213 | + * inode operation (rename entry) |
17214 | + * todo: this is crazy monster | |
1facf9fc | 17215 | + */ |
17216 | + | |
17217 | +#include "aufs.h" | |
17218 | + | |
4a4d8108 AM |
17219 | +enum { AuSRC, AuDST, AuSrcDst }; |
17220 | +enum { AuPARENT, AuCHILD, AuParentChild }; | |
1facf9fc | 17221 | + |
4a4d8108 AM |
17222 | +#define AuRen_ISDIR 1 |
17223 | +#define AuRen_ISSAMEDIR (1 << 1) | |
17224 | +#define AuRen_WHSRC (1 << 2) | |
17225 | +#define AuRen_WHDST (1 << 3) | |
17226 | +#define AuRen_MNT_WRITE (1 << 4) | |
17227 | +#define AuRen_DT_DSTDIR (1 << 5) | |
17228 | +#define AuRen_DIROPQ (1 << 6) | |
17229 | +#define AuRen_CPUP (1 << 7) | |
17230 | +#define au_ftest_ren(flags, name) ((flags) & AuRen_##name) | |
7f207e10 AM |
17231 | +#define au_fset_ren(flags, name) \ |
17232 | + do { (flags) |= AuRen_##name; } while (0) | |
17233 | +#define au_fclr_ren(flags, name) \ | |
17234 | + do { (flags) &= ~AuRen_##name; } while (0) | |
1facf9fc | 17235 | + |
4a4d8108 AM |
17236 | +struct au_ren_args { |
17237 | + struct { | |
17238 | + struct dentry *dentry, *h_dentry, *parent, *h_parent, | |
17239 | + *wh_dentry; | |
17240 | + struct inode *dir, *inode; | |
17241 | + struct au_hinode *hdir; | |
17242 | + struct au_dtime dt[AuParentChild]; | |
17243 | + aufs_bindex_t bstart; | |
17244 | + } sd[AuSrcDst]; | |
1facf9fc | 17245 | + |
4a4d8108 AM |
17246 | +#define src_dentry sd[AuSRC].dentry |
17247 | +#define src_dir sd[AuSRC].dir | |
17248 | +#define src_inode sd[AuSRC].inode | |
17249 | +#define src_h_dentry sd[AuSRC].h_dentry | |
17250 | +#define src_parent sd[AuSRC].parent | |
17251 | +#define src_h_parent sd[AuSRC].h_parent | |
17252 | +#define src_wh_dentry sd[AuSRC].wh_dentry | |
17253 | +#define src_hdir sd[AuSRC].hdir | |
17254 | +#define src_h_dir sd[AuSRC].hdir->hi_inode | |
17255 | +#define src_dt sd[AuSRC].dt | |
17256 | +#define src_bstart sd[AuSRC].bstart | |
1facf9fc | 17257 | + |
4a4d8108 AM |
17258 | +#define dst_dentry sd[AuDST].dentry |
17259 | +#define dst_dir sd[AuDST].dir | |
17260 | +#define dst_inode sd[AuDST].inode | |
17261 | +#define dst_h_dentry sd[AuDST].h_dentry | |
17262 | +#define dst_parent sd[AuDST].parent | |
17263 | +#define dst_h_parent sd[AuDST].h_parent | |
17264 | +#define dst_wh_dentry sd[AuDST].wh_dentry | |
17265 | +#define dst_hdir sd[AuDST].hdir | |
17266 | +#define dst_h_dir sd[AuDST].hdir->hi_inode | |
17267 | +#define dst_dt sd[AuDST].dt | |
17268 | +#define dst_bstart sd[AuDST].bstart | |
17269 | + | |
17270 | + struct dentry *h_trap; | |
17271 | + struct au_branch *br; | |
17272 | + struct au_hinode *src_hinode; | |
17273 | + struct path h_path; | |
17274 | + struct au_nhash whlist; | |
027c5e7a | 17275 | + aufs_bindex_t btgt, src_bwh, src_bdiropq; |
1facf9fc | 17276 | + |
1308ab2a | 17277 | + unsigned int flags; |
1facf9fc | 17278 | + |
4a4d8108 AM |
17279 | + struct au_whtmp_rmdir *thargs; |
17280 | + struct dentry *h_dst; | |
17281 | +}; | |
1308ab2a | 17282 | + |
4a4d8108 | 17283 | +/* ---------------------------------------------------------------------- */ |
1308ab2a | 17284 | + |
4a4d8108 AM |
17285 | +/* |
17286 | + * functions for reverting. | |
17287 | + * when an error happened in a single rename systemcall, we should revert | |
17288 | + * everything as if nothing happend. | |
17289 | + * we don't need to revert the copied-up/down the parent dir since they are | |
17290 | + * harmless. | |
17291 | + */ | |
1facf9fc | 17292 | + |
4a4d8108 AM |
17293 | +#define RevertFailure(fmt, ...) do { \ |
17294 | + AuIOErr("revert failure: " fmt " (%d, %d)\n", \ | |
17295 | + ##__VA_ARGS__, err, rerr); \ | |
17296 | + err = -EIO; \ | |
17297 | +} while (0) | |
1facf9fc | 17298 | + |
4a4d8108 | 17299 | +static void au_ren_rev_diropq(int err, struct au_ren_args *a) |
1facf9fc | 17300 | +{ |
4a4d8108 | 17301 | + int rerr; |
1facf9fc | 17302 | + |
4a4d8108 AM |
17303 | + au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD); |
17304 | + rerr = au_diropq_remove(a->src_dentry, a->btgt); | |
17305 | + au_hn_imtx_unlock(a->src_hinode); | |
027c5e7a | 17306 | + au_set_dbdiropq(a->src_dentry, a->src_bdiropq); |
4a4d8108 AM |
17307 | + if (rerr) |
17308 | + RevertFailure("remove diropq %.*s", AuDLNPair(a->src_dentry)); | |
17309 | +} | |
1facf9fc | 17310 | + |
4a4d8108 AM |
17311 | +static void au_ren_rev_rename(int err, struct au_ren_args *a) |
17312 | +{ | |
17313 | + int rerr; | |
1facf9fc | 17314 | + |
4a4d8108 AM |
17315 | + a->h_path.dentry = au_lkup_one(&a->src_dentry->d_name, a->src_h_parent, |
17316 | + a->br, /*nd*/NULL); | |
17317 | + rerr = PTR_ERR(a->h_path.dentry); | |
17318 | + if (IS_ERR(a->h_path.dentry)) { | |
17319 | + RevertFailure("au_lkup_one %.*s", AuDLNPair(a->src_dentry)); | |
17320 | + return; | |
1facf9fc | 17321 | + } |
17322 | + | |
4a4d8108 AM |
17323 | + rerr = vfsub_rename(a->dst_h_dir, |
17324 | + au_h_dptr(a->src_dentry, a->btgt), | |
17325 | + a->src_h_dir, &a->h_path); | |
17326 | + d_drop(a->h_path.dentry); | |
17327 | + dput(a->h_path.dentry); | |
17328 | + /* au_set_h_dptr(a->src_dentry, a->btgt, NULL); */ | |
17329 | + if (rerr) | |
17330 | + RevertFailure("rename %.*s", AuDLNPair(a->src_dentry)); | |
1facf9fc | 17331 | +} |
17332 | + | |
4a4d8108 | 17333 | +static void au_ren_rev_cpup(int err, struct au_ren_args *a) |
1facf9fc | 17334 | +{ |
4a4d8108 | 17335 | + int rerr; |
1facf9fc | 17336 | + |
4a4d8108 AM |
17337 | + a->h_path.dentry = a->dst_h_dentry; |
17338 | + rerr = vfsub_unlink(a->dst_h_dir, &a->h_path, /*force*/0); | |
17339 | + au_set_h_dptr(a->src_dentry, a->btgt, NULL); | |
17340 | + au_set_dbstart(a->src_dentry, a->src_bstart); | |
17341 | + if (rerr) | |
17342 | + RevertFailure("unlink %.*s", AuDLNPair(a->dst_h_dentry)); | |
1facf9fc | 17343 | +} |
17344 | + | |
4a4d8108 | 17345 | +static void au_ren_rev_whtmp(int err, struct au_ren_args *a) |
1facf9fc | 17346 | +{ |
4a4d8108 | 17347 | + int rerr; |
dece6358 | 17348 | + |
4a4d8108 AM |
17349 | + a->h_path.dentry = au_lkup_one(&a->dst_dentry->d_name, a->dst_h_parent, |
17350 | + a->br, /*nd*/NULL); | |
17351 | + rerr = PTR_ERR(a->h_path.dentry); | |
17352 | + if (IS_ERR(a->h_path.dentry)) { | |
17353 | + RevertFailure("lookup %.*s", AuDLNPair(a->dst_dentry)); | |
17354 | + return; | |
17355 | + } | |
17356 | + if (a->h_path.dentry->d_inode) { | |
17357 | + d_drop(a->h_path.dentry); | |
17358 | + dput(a->h_path.dentry); | |
17359 | + return; | |
dece6358 AM |
17360 | + } |
17361 | + | |
4a4d8108 AM |
17362 | + rerr = vfsub_rename(a->dst_h_dir, a->h_dst, a->dst_h_dir, &a->h_path); |
17363 | + d_drop(a->h_path.dentry); | |
17364 | + dput(a->h_path.dentry); | |
17365 | + if (!rerr) | |
17366 | + au_set_h_dptr(a->dst_dentry, a->btgt, dget(a->h_dst)); | |
17367 | + else | |
17368 | + RevertFailure("rename %.*s", AuDLNPair(a->h_dst)); | |
17369 | +} | |
1308ab2a | 17370 | + |
4a4d8108 AM |
17371 | +static void au_ren_rev_whsrc(int err, struct au_ren_args *a) |
17372 | +{ | |
17373 | + int rerr; | |
1308ab2a | 17374 | + |
4a4d8108 AM |
17375 | + a->h_path.dentry = a->src_wh_dentry; |
17376 | + rerr = au_wh_unlink_dentry(a->src_h_dir, &a->h_path, a->src_dentry); | |
027c5e7a | 17377 | + au_set_dbwh(a->src_dentry, a->src_bwh); |
4a4d8108 AM |
17378 | + if (rerr) |
17379 | + RevertFailure("unlink %.*s", AuDLNPair(a->src_wh_dentry)); | |
17380 | +} | |
4a4d8108 | 17381 | +#undef RevertFailure |
1facf9fc | 17382 | + |
1308ab2a | 17383 | +/* ---------------------------------------------------------------------- */ |
17384 | + | |
4a4d8108 AM |
17385 | +/* |
17386 | + * when we have to copyup the renaming entry, do it with the rename-target name | |
17387 | + * in order to minimize the cost (the later actual rename is unnecessary). | |
17388 | + * otherwise rename it on the target branch. | |
17389 | + */ | |
17390 | +static int au_ren_or_cpup(struct au_ren_args *a) | |
1facf9fc | 17391 | +{ |
dece6358 | 17392 | + int err; |
4a4d8108 | 17393 | + struct dentry *d; |
1facf9fc | 17394 | + |
4a4d8108 AM |
17395 | + d = a->src_dentry; |
17396 | + if (au_dbstart(d) == a->btgt) { | |
17397 | + a->h_path.dentry = a->dst_h_dentry; | |
17398 | + if (au_ftest_ren(a->flags, DIROPQ) | |
17399 | + && au_dbdiropq(d) == a->btgt) | |
17400 | + au_fclr_ren(a->flags, DIROPQ); | |
17401 | + AuDebugOn(au_dbstart(d) != a->btgt); | |
17402 | + err = vfsub_rename(a->src_h_dir, au_h_dptr(d, a->btgt), | |
17403 | + a->dst_h_dir, &a->h_path); | |
17404 | + } else { | |
17405 | + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex; | |
17406 | + struct file *h_file; | |
1308ab2a | 17407 | + |
4a4d8108 AM |
17408 | + au_fset_ren(a->flags, CPUP); |
17409 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
17410 | + au_set_dbstart(d, a->btgt); | |
17411 | + au_set_h_dptr(d, a->btgt, dget(a->dst_h_dentry)); | |
17412 | + h_file = au_h_open_pre(d, a->src_bstart); | |
17413 | + if (IS_ERR(h_file)) { | |
17414 | + err = PTR_ERR(h_file); | |
17415 | + h_file = NULL; | |
17416 | + } else | |
17417 | + err = au_sio_cpup_single(d, a->btgt, a->src_bstart, -1, | |
17418 | + !AuCpup_DTIME, a->dst_parent); | |
17419 | + mutex_unlock(h_mtx); | |
17420 | + au_h_open_post(d, a->src_bstart, h_file); | |
17421 | + if (!err) { | |
17422 | + d = a->dst_dentry; | |
17423 | + au_set_h_dptr(d, a->btgt, NULL); | |
17424 | + au_update_dbstart(d); | |
17425 | + } else { | |
17426 | + au_set_h_dptr(d, a->btgt, NULL); | |
17427 | + au_set_dbstart(d, a->src_bstart); | |
17428 | + } | |
1308ab2a | 17429 | + } |
027c5e7a AM |
17430 | + if (!err && a->h_dst) |
17431 | + /* it will be set to dinfo later */ | |
17432 | + dget(a->h_dst); | |
1facf9fc | 17433 | + |
dece6358 AM |
17434 | + return err; |
17435 | +} | |
1facf9fc | 17436 | + |
4a4d8108 AM |
17437 | +/* cf. aufs_rmdir() */ |
17438 | +static int au_ren_del_whtmp(struct au_ren_args *a) | |
dece6358 | 17439 | +{ |
4a4d8108 AM |
17440 | + int err; |
17441 | + struct inode *dir; | |
1facf9fc | 17442 | + |
4a4d8108 AM |
17443 | + dir = a->dst_dir; |
17444 | + SiMustAnyLock(dir->i_sb); | |
17445 | + if (!au_nhash_test_longer_wh(&a->whlist, a->btgt, | |
17446 | + au_sbi(dir->i_sb)->si_dirwh) | |
17447 | + || au_test_fs_remote(a->h_dst->d_sb)) { | |
17448 | + err = au_whtmp_rmdir(dir, a->btgt, a->h_dst, &a->whlist); | |
17449 | + if (unlikely(err)) | |
17450 | + pr_warning("failed removing whtmp dir %.*s (%d), " | |
17451 | + "ignored.\n", AuDLNPair(a->h_dst), err); | |
17452 | + } else { | |
17453 | + au_nhash_wh_free(&a->thargs->whlist); | |
17454 | + a->thargs->whlist = a->whlist; | |
17455 | + a->whlist.nh_num = 0; | |
17456 | + au_whtmp_kick_rmdir(dir, a->btgt, a->h_dst, a->thargs); | |
17457 | + dput(a->h_dst); | |
17458 | + a->thargs = NULL; | |
17459 | + } | |
17460 | + | |
17461 | + return 0; | |
1308ab2a | 17462 | +} |
1facf9fc | 17463 | + |
4a4d8108 AM |
17464 | +/* make it 'opaque' dir. */ |
17465 | +static int au_ren_diropq(struct au_ren_args *a) | |
17466 | +{ | |
17467 | + int err; | |
17468 | + struct dentry *diropq; | |
1facf9fc | 17469 | + |
4a4d8108 | 17470 | + err = 0; |
027c5e7a | 17471 | + a->src_bdiropq = au_dbdiropq(a->src_dentry); |
4a4d8108 AM |
17472 | + a->src_hinode = au_hi(a->src_inode, a->btgt); |
17473 | + au_hn_imtx_lock_nested(a->src_hinode, AuLsc_I_CHILD); | |
17474 | + diropq = au_diropq_create(a->src_dentry, a->btgt); | |
17475 | + au_hn_imtx_unlock(a->src_hinode); | |
17476 | + if (IS_ERR(diropq)) | |
17477 | + err = PTR_ERR(diropq); | |
17478 | + dput(diropq); | |
1facf9fc | 17479 | + |
4a4d8108 AM |
17480 | + return err; |
17481 | +} | |
1facf9fc | 17482 | + |
4a4d8108 AM |
17483 | +static int do_rename(struct au_ren_args *a) |
17484 | +{ | |
17485 | + int err; | |
17486 | + struct dentry *d, *h_d; | |
1facf9fc | 17487 | + |
4a4d8108 AM |
17488 | + /* prepare workqueue args for asynchronous rmdir */ |
17489 | + h_d = a->dst_h_dentry; | |
17490 | + if (au_ftest_ren(a->flags, ISDIR) && h_d->d_inode) { | |
17491 | + err = -ENOMEM; | |
17492 | + a->thargs = au_whtmp_rmdir_alloc(a->src_dentry->d_sb, GFP_NOFS); | |
17493 | + if (unlikely(!a->thargs)) | |
17494 | + goto out; | |
17495 | + a->h_dst = dget(h_d); | |
17496 | + } | |
1facf9fc | 17497 | + |
4a4d8108 AM |
17498 | + /* create whiteout for src_dentry */ |
17499 | + if (au_ftest_ren(a->flags, WHSRC)) { | |
027c5e7a AM |
17500 | + a->src_bwh = au_dbwh(a->src_dentry); |
17501 | + AuDebugOn(a->src_bwh >= 0); | |
4a4d8108 AM |
17502 | + a->src_wh_dentry |
17503 | + = au_wh_create(a->src_dentry, a->btgt, a->src_h_parent); | |
17504 | + err = PTR_ERR(a->src_wh_dentry); | |
17505 | + if (IS_ERR(a->src_wh_dentry)) | |
17506 | + goto out_thargs; | |
17507 | + } | |
1facf9fc | 17508 | + |
4a4d8108 AM |
17509 | + /* lookup whiteout for dentry */ |
17510 | + if (au_ftest_ren(a->flags, WHDST)) { | |
17511 | + h_d = au_wh_lkup(a->dst_h_parent, &a->dst_dentry->d_name, | |
17512 | + a->br); | |
17513 | + err = PTR_ERR(h_d); | |
17514 | + if (IS_ERR(h_d)) | |
17515 | + goto out_whsrc; | |
17516 | + if (!h_d->d_inode) | |
17517 | + dput(h_d); | |
17518 | + else | |
17519 | + a->dst_wh_dentry = h_d; | |
17520 | + } | |
1facf9fc | 17521 | + |
4a4d8108 AM |
17522 | + /* rename dentry to tmpwh */ |
17523 | + if (a->thargs) { | |
17524 | + err = au_whtmp_ren(a->dst_h_dentry, a->br); | |
17525 | + if (unlikely(err)) | |
17526 | + goto out_whdst; | |
dece6358 | 17527 | + |
4a4d8108 AM |
17528 | + d = a->dst_dentry; |
17529 | + au_set_h_dptr(d, a->btgt, NULL); | |
17530 | + err = au_lkup_neg(d, a->btgt); | |
17531 | + if (unlikely(err)) | |
17532 | + goto out_whtmp; | |
17533 | + a->dst_h_dentry = au_h_dptr(d, a->btgt); | |
17534 | + } | |
1facf9fc | 17535 | + |
4a4d8108 AM |
17536 | + /* cpup src */ |
17537 | + if (a->dst_h_dentry->d_inode && a->src_bstart != a->btgt) { | |
17538 | + struct mutex *h_mtx = &a->src_h_dentry->d_inode->i_mutex; | |
17539 | + struct file *h_file; | |
1facf9fc | 17540 | + |
4a4d8108 AM |
17541 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); |
17542 | + AuDebugOn(au_dbstart(a->src_dentry) != a->src_bstart); | |
17543 | + h_file = au_h_open_pre(a->src_dentry, a->src_bstart); | |
17544 | + if (IS_ERR(h_file)) { | |
17545 | + err = PTR_ERR(h_file); | |
17546 | + h_file = NULL; | |
17547 | + } else | |
17548 | + err = au_sio_cpup_simple(a->src_dentry, a->btgt, -1, | |
17549 | + !AuCpup_DTIME); | |
17550 | + mutex_unlock(h_mtx); | |
17551 | + au_h_open_post(a->src_dentry, a->src_bstart, h_file); | |
17552 | + if (unlikely(err)) | |
17553 | + goto out_whtmp; | |
17554 | + } | |
1facf9fc | 17555 | + |
4a4d8108 AM |
17556 | + /* rename by vfs_rename or cpup */ |
17557 | + d = a->dst_dentry; | |
17558 | + if (au_ftest_ren(a->flags, ISDIR) | |
17559 | + && (a->dst_wh_dentry | |
17560 | + || au_dbdiropq(d) == a->btgt | |
17561 | + /* hide the lower to keep xino */ | |
17562 | + || a->btgt < au_dbend(d) | |
17563 | + || au_opt_test(au_mntflags(d->d_sb), ALWAYS_DIROPQ))) | |
17564 | + au_fset_ren(a->flags, DIROPQ); | |
17565 | + err = au_ren_or_cpup(a); | |
17566 | + if (unlikely(err)) | |
17567 | + /* leave the copied-up one */ | |
17568 | + goto out_whtmp; | |
1308ab2a | 17569 | + |
4a4d8108 AM |
17570 | + /* make dir opaque */ |
17571 | + if (au_ftest_ren(a->flags, DIROPQ)) { | |
17572 | + err = au_ren_diropq(a); | |
17573 | + if (unlikely(err)) | |
17574 | + goto out_rename; | |
17575 | + } | |
1308ab2a | 17576 | + |
4a4d8108 AM |
17577 | + /* update target timestamps */ |
17578 | + AuDebugOn(au_dbstart(a->src_dentry) != a->btgt); | |
17579 | + a->h_path.dentry = au_h_dptr(a->src_dentry, a->btgt); | |
17580 | + vfsub_update_h_iattr(&a->h_path, /*did*/NULL); /*ignore*/ | |
17581 | + a->src_inode->i_ctime = a->h_path.dentry->d_inode->i_ctime; | |
1facf9fc | 17582 | + |
4a4d8108 AM |
17583 | + /* remove whiteout for dentry */ |
17584 | + if (a->dst_wh_dentry) { | |
17585 | + a->h_path.dentry = a->dst_wh_dentry; | |
17586 | + err = au_wh_unlink_dentry(a->dst_h_dir, &a->h_path, | |
17587 | + a->dst_dentry); | |
17588 | + if (unlikely(err)) | |
17589 | + goto out_diropq; | |
17590 | + } | |
1facf9fc | 17591 | + |
4a4d8108 AM |
17592 | + /* remove whtmp */ |
17593 | + if (a->thargs) | |
17594 | + au_ren_del_whtmp(a); /* ignore this error */ | |
1308ab2a | 17595 | + |
4a4d8108 AM |
17596 | + err = 0; |
17597 | + goto out_success; | |
17598 | + | |
4f0767ce | 17599 | +out_diropq: |
4a4d8108 AM |
17600 | + if (au_ftest_ren(a->flags, DIROPQ)) |
17601 | + au_ren_rev_diropq(err, a); | |
4f0767ce | 17602 | +out_rename: |
4a4d8108 AM |
17603 | + if (!au_ftest_ren(a->flags, CPUP)) |
17604 | + au_ren_rev_rename(err, a); | |
17605 | + else | |
17606 | + au_ren_rev_cpup(err, a); | |
027c5e7a | 17607 | + dput(a->h_dst); |
4f0767ce | 17608 | +out_whtmp: |
4a4d8108 AM |
17609 | + if (a->thargs) |
17610 | + au_ren_rev_whtmp(err, a); | |
4f0767ce | 17611 | +out_whdst: |
4a4d8108 AM |
17612 | + dput(a->dst_wh_dentry); |
17613 | + a->dst_wh_dentry = NULL; | |
4f0767ce | 17614 | +out_whsrc: |
4a4d8108 AM |
17615 | + if (a->src_wh_dentry) |
17616 | + au_ren_rev_whsrc(err, a); | |
4f0767ce | 17617 | +out_success: |
4a4d8108 AM |
17618 | + dput(a->src_wh_dentry); |
17619 | + dput(a->dst_wh_dentry); | |
4f0767ce | 17620 | +out_thargs: |
4a4d8108 AM |
17621 | + if (a->thargs) { |
17622 | + dput(a->h_dst); | |
17623 | + au_whtmp_rmdir_free(a->thargs); | |
17624 | + a->thargs = NULL; | |
17625 | + } | |
4f0767ce | 17626 | +out: |
4a4d8108 | 17627 | + return err; |
dece6358 | 17628 | +} |
1facf9fc | 17629 | + |
1308ab2a | 17630 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17631 | + |
4a4d8108 AM |
17632 | +/* |
17633 | + * test if @dentry dir can be rename destination or not. | |
17634 | + * success means, it is a logically empty dir. | |
17635 | + */ | |
17636 | +static int may_rename_dstdir(struct dentry *dentry, struct au_nhash *whlist) | |
1308ab2a | 17637 | +{ |
4a4d8108 | 17638 | + return au_test_empty(dentry, whlist); |
1308ab2a | 17639 | +} |
1facf9fc | 17640 | + |
4a4d8108 AM |
17641 | +/* |
17642 | + * test if @dentry dir can be rename source or not. | |
17643 | + * if it can, return 0 and @children is filled. | |
17644 | + * success means, | |
17645 | + * - it is a logically empty dir. | |
17646 | + * - or, it exists on writable branch and has no children including whiteouts | |
17647 | + * on the lower branch. | |
17648 | + */ | |
17649 | +static int may_rename_srcdir(struct dentry *dentry, aufs_bindex_t btgt) | |
17650 | +{ | |
17651 | + int err; | |
17652 | + unsigned int rdhash; | |
17653 | + aufs_bindex_t bstart; | |
1facf9fc | 17654 | + |
4a4d8108 AM |
17655 | + bstart = au_dbstart(dentry); |
17656 | + if (bstart != btgt) { | |
17657 | + struct au_nhash whlist; | |
dece6358 | 17658 | + |
4a4d8108 AM |
17659 | + SiMustAnyLock(dentry->d_sb); |
17660 | + rdhash = au_sbi(dentry->d_sb)->si_rdhash; | |
17661 | + if (!rdhash) | |
17662 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, | |
17663 | + dentry)); | |
17664 | + err = au_nhash_alloc(&whlist, rdhash, GFP_NOFS); | |
17665 | + if (unlikely(err)) | |
17666 | + goto out; | |
17667 | + err = au_test_empty(dentry, &whlist); | |
17668 | + au_nhash_wh_free(&whlist); | |
17669 | + goto out; | |
17670 | + } | |
dece6358 | 17671 | + |
4a4d8108 AM |
17672 | + if (bstart == au_dbtaildir(dentry)) |
17673 | + return 0; /* success */ | |
dece6358 | 17674 | + |
4a4d8108 | 17675 | + err = au_test_empty_lower(dentry); |
1facf9fc | 17676 | + |
4f0767ce | 17677 | +out: |
4a4d8108 AM |
17678 | + if (err == -ENOTEMPTY) { |
17679 | + AuWarn1("renaming dir who has child(ren) on multiple branches," | |
17680 | + " is not supported\n"); | |
17681 | + err = -EXDEV; | |
17682 | + } | |
17683 | + return err; | |
17684 | +} | |
1308ab2a | 17685 | + |
4a4d8108 AM |
17686 | +/* side effect: sets whlist and h_dentry */ |
17687 | +static int au_ren_may_dir(struct au_ren_args *a) | |
1308ab2a | 17688 | +{ |
4a4d8108 AM |
17689 | + int err; |
17690 | + unsigned int rdhash; | |
17691 | + struct dentry *d; | |
1facf9fc | 17692 | + |
4a4d8108 AM |
17693 | + d = a->dst_dentry; |
17694 | + SiMustAnyLock(d->d_sb); | |
1facf9fc | 17695 | + |
4a4d8108 AM |
17696 | + err = 0; |
17697 | + if (au_ftest_ren(a->flags, ISDIR) && a->dst_inode) { | |
17698 | + rdhash = au_sbi(d->d_sb)->si_rdhash; | |
17699 | + if (!rdhash) | |
17700 | + rdhash = au_rdhash_est(au_dir_size(/*file*/NULL, d)); | |
17701 | + err = au_nhash_alloc(&a->whlist, rdhash, GFP_NOFS); | |
17702 | + if (unlikely(err)) | |
17703 | + goto out; | |
1308ab2a | 17704 | + |
4a4d8108 AM |
17705 | + au_set_dbstart(d, a->dst_bstart); |
17706 | + err = may_rename_dstdir(d, &a->whlist); | |
17707 | + au_set_dbstart(d, a->btgt); | |
17708 | + } | |
17709 | + a->dst_h_dentry = au_h_dptr(d, au_dbstart(d)); | |
17710 | + if (unlikely(err)) | |
17711 | + goto out; | |
17712 | + | |
17713 | + d = a->src_dentry; | |
17714 | + a->src_h_dentry = au_h_dptr(d, au_dbstart(d)); | |
17715 | + if (au_ftest_ren(a->flags, ISDIR)) { | |
17716 | + err = may_rename_srcdir(d, a->btgt); | |
17717 | + if (unlikely(err)) { | |
17718 | + au_nhash_wh_free(&a->whlist); | |
17719 | + a->whlist.nh_num = 0; | |
17720 | + } | |
17721 | + } | |
4f0767ce | 17722 | +out: |
4a4d8108 | 17723 | + return err; |
1facf9fc | 17724 | +} |
17725 | + | |
4a4d8108 | 17726 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17727 | + |
4a4d8108 AM |
17728 | +/* |
17729 | + * simple tests for rename. | |
17730 | + * following the checks in vfs, plus the parent-child relationship. | |
17731 | + */ | |
17732 | +static int au_may_ren(struct au_ren_args *a) | |
17733 | +{ | |
17734 | + int err, isdir; | |
17735 | + struct inode *h_inode; | |
1facf9fc | 17736 | + |
4a4d8108 AM |
17737 | + if (a->src_bstart == a->btgt) { |
17738 | + err = au_may_del(a->src_dentry, a->btgt, a->src_h_parent, | |
17739 | + au_ftest_ren(a->flags, ISDIR)); | |
17740 | + if (unlikely(err)) | |
17741 | + goto out; | |
17742 | + err = -EINVAL; | |
17743 | + if (unlikely(a->src_h_dentry == a->h_trap)) | |
17744 | + goto out; | |
17745 | + } | |
1facf9fc | 17746 | + |
4a4d8108 AM |
17747 | + err = 0; |
17748 | + if (a->dst_bstart != a->btgt) | |
17749 | + goto out; | |
1facf9fc | 17750 | + |
027c5e7a AM |
17751 | + err = -ENOTEMPTY; |
17752 | + if (unlikely(a->dst_h_dentry == a->h_trap)) | |
17753 | + goto out; | |
17754 | + | |
4a4d8108 AM |
17755 | + err = -EIO; |
17756 | + h_inode = a->dst_h_dentry->d_inode; | |
17757 | + isdir = !!au_ftest_ren(a->flags, ISDIR); | |
17758 | + if (!a->dst_dentry->d_inode) { | |
17759 | + if (unlikely(h_inode)) | |
17760 | + goto out; | |
17761 | + err = au_may_add(a->dst_dentry, a->btgt, a->dst_h_parent, | |
17762 | + isdir); | |
17763 | + } else { | |
17764 | + if (unlikely(!h_inode || !h_inode->i_nlink)) | |
17765 | + goto out; | |
17766 | + err = au_may_del(a->dst_dentry, a->btgt, a->dst_h_parent, | |
17767 | + isdir); | |
17768 | + if (unlikely(err)) | |
17769 | + goto out; | |
4a4d8108 | 17770 | + } |
1facf9fc | 17771 | + |
4f0767ce | 17772 | +out: |
4a4d8108 AM |
17773 | + if (unlikely(err == -ENOENT || err == -EEXIST)) |
17774 | + err = -EIO; | |
17775 | + AuTraceErr(err); | |
17776 | + return err; | |
17777 | +} | |
1facf9fc | 17778 | + |
1308ab2a | 17779 | +/* ---------------------------------------------------------------------- */ |
1facf9fc | 17780 | + |
4a4d8108 AM |
17781 | +/* |
17782 | + * locking order | |
17783 | + * (VFS) | |
17784 | + * - src_dir and dir by lock_rename() | |
17785 | + * - inode if exitsts | |
17786 | + * (aufs) | |
17787 | + * - lock all | |
17788 | + * + src_dentry and dentry by aufs_read_and_write_lock2() which calls, | |
17789 | + * + si_read_lock | |
17790 | + * + di_write_lock2_child() | |
17791 | + * + di_write_lock_child() | |
17792 | + * + ii_write_lock_child() | |
17793 | + * + di_write_lock_child2() | |
17794 | + * + ii_write_lock_child2() | |
17795 | + * + src_parent and parent | |
17796 | + * + di_write_lock_parent() | |
17797 | + * + ii_write_lock_parent() | |
17798 | + * + di_write_lock_parent2() | |
17799 | + * + ii_write_lock_parent2() | |
17800 | + * + lower src_dir and dir by vfsub_lock_rename() | |
17801 | + * + verify the every relationships between child and parent. if any | |
17802 | + * of them failed, unlock all and return -EBUSY. | |
17803 | + */ | |
17804 | +static void au_ren_unlock(struct au_ren_args *a) | |
1308ab2a | 17805 | +{ |
4a4d8108 AM |
17806 | + struct super_block *sb; |
17807 | + | |
17808 | + sb = a->dst_dentry->d_sb; | |
17809 | + if (au_ftest_ren(a->flags, MNT_WRITE)) | |
17810 | + mnt_drop_write(a->br->br_mnt); | |
17811 | + vfsub_unlock_rename(a->src_h_parent, a->src_hdir, | |
17812 | + a->dst_h_parent, a->dst_hdir); | |
1308ab2a | 17813 | +} |
17814 | + | |
4a4d8108 | 17815 | +static int au_ren_lock(struct au_ren_args *a) |
1308ab2a | 17816 | +{ |
4a4d8108 AM |
17817 | + int err; |
17818 | + unsigned int udba; | |
1308ab2a | 17819 | + |
4a4d8108 AM |
17820 | + err = 0; |
17821 | + a->src_h_parent = au_h_dptr(a->src_parent, a->btgt); | |
17822 | + a->src_hdir = au_hi(a->src_dir, a->btgt); | |
17823 | + a->dst_h_parent = au_h_dptr(a->dst_parent, a->btgt); | |
17824 | + a->dst_hdir = au_hi(a->dst_dir, a->btgt); | |
17825 | + a->h_trap = vfsub_lock_rename(a->src_h_parent, a->src_hdir, | |
17826 | + a->dst_h_parent, a->dst_hdir); | |
17827 | + udba = au_opt_udba(a->src_dentry->d_sb); | |
17828 | + if (unlikely(a->src_hdir->hi_inode != a->src_h_parent->d_inode | |
17829 | + || a->dst_hdir->hi_inode != a->dst_h_parent->d_inode)) | |
17830 | + err = au_busy_or_stale(); | |
17831 | + if (!err && au_dbstart(a->src_dentry) == a->btgt) | |
17832 | + err = au_h_verify(a->src_h_dentry, udba, | |
17833 | + a->src_h_parent->d_inode, a->src_h_parent, | |
17834 | + a->br); | |
17835 | + if (!err && au_dbstart(a->dst_dentry) == a->btgt) | |
17836 | + err = au_h_verify(a->dst_h_dentry, udba, | |
17837 | + a->dst_h_parent->d_inode, a->dst_h_parent, | |
17838 | + a->br); | |
17839 | + if (!err) { | |
17840 | + err = mnt_want_write(a->br->br_mnt); | |
17841 | + if (unlikely(err)) | |
17842 | + goto out_unlock; | |
17843 | + au_fset_ren(a->flags, MNT_WRITE); | |
17844 | + goto out; /* success */ | |
17845 | + } | |
17846 | + | |
17847 | + err = au_busy_or_stale(); | |
17848 | + | |
4f0767ce | 17849 | +out_unlock: |
4a4d8108 | 17850 | + au_ren_unlock(a); |
4f0767ce | 17851 | +out: |
4a4d8108 | 17852 | + return err; |
1facf9fc | 17853 | +} |
17854 | + | |
17855 | +/* ---------------------------------------------------------------------- */ | |
17856 | + | |
4a4d8108 | 17857 | +static void au_ren_refresh_dir(struct au_ren_args *a) |
1facf9fc | 17858 | +{ |
4a4d8108 | 17859 | + struct inode *dir; |
dece6358 | 17860 | + |
4a4d8108 AM |
17861 | + dir = a->dst_dir; |
17862 | + dir->i_version++; | |
17863 | + if (au_ftest_ren(a->flags, ISDIR)) { | |
17864 | + /* is this updating defined in POSIX? */ | |
17865 | + au_cpup_attr_timesizes(a->src_inode); | |
17866 | + au_cpup_attr_nlink(dir, /*force*/1); | |
4a4d8108 | 17867 | + } |
027c5e7a | 17868 | + |
4a4d8108 AM |
17869 | + if (au_ibstart(dir) == a->btgt) |
17870 | + au_cpup_attr_timesizes(dir); | |
dece6358 | 17871 | + |
4a4d8108 AM |
17872 | + if (au_ftest_ren(a->flags, ISSAMEDIR)) |
17873 | + return; | |
dece6358 | 17874 | + |
4a4d8108 AM |
17875 | + dir = a->src_dir; |
17876 | + dir->i_version++; | |
17877 | + if (au_ftest_ren(a->flags, ISDIR)) | |
17878 | + au_cpup_attr_nlink(dir, /*force*/1); | |
17879 | + if (au_ibstart(dir) == a->btgt) | |
17880 | + au_cpup_attr_timesizes(dir); | |
1facf9fc | 17881 | +} |
17882 | + | |
4a4d8108 | 17883 | +static void au_ren_refresh(struct au_ren_args *a) |
1facf9fc | 17884 | +{ |
4a4d8108 AM |
17885 | + aufs_bindex_t bend, bindex; |
17886 | + struct dentry *d, *h_d; | |
17887 | + struct inode *i, *h_i; | |
17888 | + struct super_block *sb; | |
dece6358 | 17889 | + |
027c5e7a AM |
17890 | + d = a->dst_dentry; |
17891 | + d_drop(d); | |
17892 | + if (a->h_dst) | |
17893 | + /* already dget-ed by au_ren_or_cpup() */ | |
17894 | + au_set_h_dptr(d, a->btgt, a->h_dst); | |
17895 | + | |
17896 | + i = a->dst_inode; | |
17897 | + if (i) { | |
17898 | + if (!au_ftest_ren(a->flags, ISDIR)) | |
17899 | + vfsub_drop_nlink(i); | |
17900 | + else { | |
17901 | + vfsub_dead_dir(i); | |
17902 | + au_cpup_attr_timesizes(i); | |
17903 | + } | |
17904 | + au_update_dbrange(d, /*do_put_zero*/1); | |
17905 | + } else { | |
17906 | + bend = a->btgt; | |
17907 | + for (bindex = au_dbstart(d); bindex < bend; bindex++) | |
17908 | + au_set_h_dptr(d, bindex, NULL); | |
17909 | + bend = au_dbend(d); | |
17910 | + for (bindex = a->btgt + 1; bindex <= bend; bindex++) | |
17911 | + au_set_h_dptr(d, bindex, NULL); | |
17912 | + au_update_dbrange(d, /*do_put_zero*/0); | |
17913 | + } | |
17914 | + | |
4a4d8108 AM |
17915 | + d = a->src_dentry; |
17916 | + au_set_dbwh(d, -1); | |
17917 | + bend = au_dbend(d); | |
17918 | + for (bindex = a->btgt + 1; bindex <= bend; bindex++) { | |
17919 | + h_d = au_h_dptr(d, bindex); | |
17920 | + if (h_d) | |
17921 | + au_set_h_dptr(d, bindex, NULL); | |
17922 | + } | |
17923 | + au_set_dbend(d, a->btgt); | |
17924 | + | |
17925 | + sb = d->d_sb; | |
17926 | + i = a->src_inode; | |
17927 | + if (au_opt_test(au_mntflags(sb), PLINK) && au_plink_test(i)) | |
17928 | + return; /* success */ | |
17929 | + | |
17930 | + bend = au_ibend(i); | |
17931 | + for (bindex = a->btgt + 1; bindex <= bend; bindex++) { | |
17932 | + h_i = au_h_iptr(i, bindex); | |
17933 | + if (h_i) { | |
17934 | + au_xino_write(sb, bindex, h_i->i_ino, /*ino*/0); | |
17935 | + /* ignore this error */ | |
17936 | + au_set_h_iptr(i, bindex, NULL, 0); | |
17937 | + } | |
17938 | + } | |
17939 | + au_set_ibend(i, a->btgt); | |
1308ab2a | 17940 | +} |
dece6358 | 17941 | + |
4a4d8108 AM |
17942 | +/* ---------------------------------------------------------------------- */ |
17943 | + | |
17944 | +/* mainly for link(2) and rename(2) */ | |
17945 | +int au_wbr(struct dentry *dentry, aufs_bindex_t btgt) | |
1308ab2a | 17946 | +{ |
4a4d8108 AM |
17947 | + aufs_bindex_t bdiropq, bwh; |
17948 | + struct dentry *parent; | |
17949 | + struct au_branch *br; | |
17950 | + | |
17951 | + parent = dentry->d_parent; | |
17952 | + IMustLock(parent->d_inode); /* dir is locked */ | |
17953 | + | |
17954 | + bdiropq = au_dbdiropq(parent); | |
17955 | + bwh = au_dbwh(dentry); | |
17956 | + br = au_sbr(dentry->d_sb, btgt); | |
17957 | + if (au_br_rdonly(br) | |
17958 | + || (0 <= bdiropq && bdiropq < btgt) | |
17959 | + || (0 <= bwh && bwh < btgt)) | |
17960 | + btgt = -1; | |
17961 | + | |
17962 | + AuDbg("btgt %d\n", btgt); | |
17963 | + return btgt; | |
1facf9fc | 17964 | +} |
17965 | + | |
4a4d8108 AM |
17966 | +/* sets src_bstart, dst_bstart and btgt */ |
17967 | +static int au_ren_wbr(struct au_ren_args *a) | |
1facf9fc | 17968 | +{ |
4a4d8108 AM |
17969 | + int err; |
17970 | + struct au_wr_dir_args wr_dir_args = { | |
17971 | + /* .force_btgt = -1, */ | |
17972 | + .flags = AuWrDir_ADD_ENTRY | |
17973 | + }; | |
dece6358 | 17974 | + |
4a4d8108 AM |
17975 | + a->src_bstart = au_dbstart(a->src_dentry); |
17976 | + a->dst_bstart = au_dbstart(a->dst_dentry); | |
17977 | + if (au_ftest_ren(a->flags, ISDIR)) | |
17978 | + au_fset_wrdir(wr_dir_args.flags, ISDIR); | |
17979 | + wr_dir_args.force_btgt = a->src_bstart; | |
17980 | + if (a->dst_inode && a->dst_bstart < a->src_bstart) | |
17981 | + wr_dir_args.force_btgt = a->dst_bstart; | |
17982 | + wr_dir_args.force_btgt = au_wbr(a->dst_dentry, wr_dir_args.force_btgt); | |
17983 | + err = au_wr_dir(a->dst_dentry, a->src_dentry, &wr_dir_args); | |
17984 | + a->btgt = err; | |
dece6358 | 17985 | + |
4a4d8108 | 17986 | + return err; |
1facf9fc | 17987 | +} |
17988 | + | |
4a4d8108 | 17989 | +static void au_ren_dt(struct au_ren_args *a) |
1facf9fc | 17990 | +{ |
4a4d8108 AM |
17991 | + a->h_path.dentry = a->src_h_parent; |
17992 | + au_dtime_store(a->src_dt + AuPARENT, a->src_parent, &a->h_path); | |
17993 | + if (!au_ftest_ren(a->flags, ISSAMEDIR)) { | |
17994 | + a->h_path.dentry = a->dst_h_parent; | |
17995 | + au_dtime_store(a->dst_dt + AuPARENT, a->dst_parent, &a->h_path); | |
17996 | + } | |
1facf9fc | 17997 | + |
4a4d8108 AM |
17998 | + au_fclr_ren(a->flags, DT_DSTDIR); |
17999 | + if (!au_ftest_ren(a->flags, ISDIR)) | |
18000 | + return; | |
dece6358 | 18001 | + |
4a4d8108 AM |
18002 | + a->h_path.dentry = a->src_h_dentry; |
18003 | + au_dtime_store(a->src_dt + AuCHILD, a->src_dentry, &a->h_path); | |
18004 | + if (a->dst_h_dentry->d_inode) { | |
18005 | + au_fset_ren(a->flags, DT_DSTDIR); | |
18006 | + a->h_path.dentry = a->dst_h_dentry; | |
18007 | + au_dtime_store(a->dst_dt + AuCHILD, a->dst_dentry, &a->h_path); | |
18008 | + } | |
1308ab2a | 18009 | +} |
dece6358 | 18010 | + |
4a4d8108 | 18011 | +static void au_ren_rev_dt(int err, struct au_ren_args *a) |
1308ab2a | 18012 | +{ |
4a4d8108 AM |
18013 | + struct dentry *h_d; |
18014 | + struct mutex *h_mtx; | |
18015 | + | |
18016 | + au_dtime_revert(a->src_dt + AuPARENT); | |
18017 | + if (!au_ftest_ren(a->flags, ISSAMEDIR)) | |
18018 | + au_dtime_revert(a->dst_dt + AuPARENT); | |
18019 | + | |
18020 | + if (au_ftest_ren(a->flags, ISDIR) && err != -EIO) { | |
18021 | + h_d = a->src_dt[AuCHILD].dt_h_path.dentry; | |
18022 | + h_mtx = &h_d->d_inode->i_mutex; | |
18023 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
18024 | + au_dtime_revert(a->src_dt + AuCHILD); | |
18025 | + mutex_unlock(h_mtx); | |
18026 | + | |
18027 | + if (au_ftest_ren(a->flags, DT_DSTDIR)) { | |
18028 | + h_d = a->dst_dt[AuCHILD].dt_h_path.dentry; | |
18029 | + h_mtx = &h_d->d_inode->i_mutex; | |
18030 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD); | |
18031 | + au_dtime_revert(a->dst_dt + AuCHILD); | |
18032 | + mutex_unlock(h_mtx); | |
1facf9fc | 18033 | + } |
18034 | + } | |
18035 | +} | |
18036 | + | |
4a4d8108 AM |
18037 | +/* ---------------------------------------------------------------------- */ |
18038 | + | |
18039 | +int aufs_rename(struct inode *_src_dir, struct dentry *_src_dentry, | |
18040 | + struct inode *_dst_dir, struct dentry *_dst_dentry) | |
1facf9fc | 18041 | +{ |
e49829fe | 18042 | + int err, flags; |
4a4d8108 AM |
18043 | + /* reduce stack space */ |
18044 | + struct au_ren_args *a; | |
18045 | + | |
18046 | + AuDbg("%.*s, %.*s\n", AuDLNPair(_src_dentry), AuDLNPair(_dst_dentry)); | |
18047 | + IMustLock(_src_dir); | |
18048 | + IMustLock(_dst_dir); | |
18049 | + | |
18050 | + err = -ENOMEM; | |
18051 | + BUILD_BUG_ON(sizeof(*a) > PAGE_SIZE); | |
18052 | + a = kzalloc(sizeof(*a), GFP_NOFS); | |
18053 | + if (unlikely(!a)) | |
18054 | + goto out; | |
18055 | + | |
18056 | + a->src_dir = _src_dir; | |
18057 | + a->src_dentry = _src_dentry; | |
18058 | + a->src_inode = a->src_dentry->d_inode; | |
18059 | + a->src_parent = a->src_dentry->d_parent; /* dir inode is locked */ | |
18060 | + a->dst_dir = _dst_dir; | |
18061 | + a->dst_dentry = _dst_dentry; | |
18062 | + a->dst_inode = a->dst_dentry->d_inode; | |
18063 | + a->dst_parent = a->dst_dentry->d_parent; /* dir inode is locked */ | |
18064 | + if (a->dst_inode) { | |
18065 | + IMustLock(a->dst_inode); | |
18066 | + au_igrab(a->dst_inode); | |
1facf9fc | 18067 | + } |
1facf9fc | 18068 | + |
4a4d8108 | 18069 | + err = -ENOTDIR; |
027c5e7a | 18070 | + flags = AuLock_FLUSH | AuLock_NOPLM | AuLock_GEN; |
4a4d8108 AM |
18071 | + if (S_ISDIR(a->src_inode->i_mode)) { |
18072 | + au_fset_ren(a->flags, ISDIR); | |
18073 | + if (unlikely(a->dst_inode && !S_ISDIR(a->dst_inode->i_mode))) | |
18074 | + goto out_free; | |
e49829fe JR |
18075 | + err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
18076 | + AuLock_DIR | flags); | |
4a4d8108 | 18077 | + } else |
e49829fe JR |
18078 | + err = aufs_read_and_write_lock2(a->dst_dentry, a->src_dentry, |
18079 | + flags); | |
18080 | + if (unlikely(err)) | |
18081 | + goto out_free; | |
1facf9fc | 18082 | + |
027c5e7a AM |
18083 | + err = au_d_hashed_positive(a->src_dentry); |
18084 | + if (unlikely(err)) | |
18085 | + goto out_unlock; | |
18086 | + err = -ENOENT; | |
18087 | + if (a->dst_inode) { | |
18088 | + /* | |
18089 | + * If it is a dir, VFS unhash dst_dentry before this | |
18090 | + * function. It means we cannot rely upon d_unhashed(). | |
18091 | + */ | |
18092 | + if (unlikely(!a->dst_inode->i_nlink)) | |
18093 | + goto out_unlock; | |
18094 | + if (!S_ISDIR(a->dst_inode->i_mode)) { | |
18095 | + err = au_d_hashed_positive(a->dst_dentry); | |
18096 | + if (unlikely(err)) | |
18097 | + goto out_unlock; | |
18098 | + } else if (unlikely(IS_DEADDIR(a->dst_inode))) | |
18099 | + goto out_unlock; | |
18100 | + } else if (unlikely(d_unhashed(a->dst_dentry))) | |
18101 | + goto out_unlock; | |
18102 | + | |
4a4d8108 AM |
18103 | + au_fset_ren(a->flags, ISSAMEDIR); /* temporary */ |
18104 | + di_write_lock_parent(a->dst_parent); | |
1facf9fc | 18105 | + |
4a4d8108 AM |
18106 | + /* which branch we process */ |
18107 | + err = au_ren_wbr(a); | |
18108 | + if (unlikely(err < 0)) | |
027c5e7a | 18109 | + goto out_parent; |
4a4d8108 AM |
18110 | + a->br = au_sbr(a->dst_dentry->d_sb, a->btgt); |
18111 | + a->h_path.mnt = a->br->br_mnt; | |
1facf9fc | 18112 | + |
4a4d8108 AM |
18113 | + /* are they available to be renamed */ |
18114 | + err = au_ren_may_dir(a); | |
18115 | + if (unlikely(err)) | |
18116 | + goto out_children; | |
1facf9fc | 18117 | + |
4a4d8108 AM |
18118 | + /* prepare the writable parent dir on the same branch */ |
18119 | + if (a->dst_bstart == a->btgt) { | |
18120 | + au_fset_ren(a->flags, WHDST); | |
18121 | + } else { | |
18122 | + err = au_cpup_dirs(a->dst_dentry, a->btgt); | |
18123 | + if (unlikely(err)) | |
18124 | + goto out_children; | |
18125 | + } | |
1facf9fc | 18126 | + |
4a4d8108 AM |
18127 | + if (a->src_dir != a->dst_dir) { |
18128 | + /* | |
18129 | + * this temporary unlock is safe, | |
18130 | + * because both dir->i_mutex are locked. | |
18131 | + */ | |
18132 | + di_write_unlock(a->dst_parent); | |
18133 | + di_write_lock_parent(a->src_parent); | |
18134 | + err = au_wr_dir_need_wh(a->src_dentry, | |
18135 | + au_ftest_ren(a->flags, ISDIR), | |
18136 | + &a->btgt); | |
18137 | + di_write_unlock(a->src_parent); | |
18138 | + di_write_lock2_parent(a->src_parent, a->dst_parent, /*isdir*/1); | |
18139 | + au_fclr_ren(a->flags, ISSAMEDIR); | |
18140 | + } else | |
18141 | + err = au_wr_dir_need_wh(a->src_dentry, | |
18142 | + au_ftest_ren(a->flags, ISDIR), | |
18143 | + &a->btgt); | |
18144 | + if (unlikely(err < 0)) | |
18145 | + goto out_children; | |
18146 | + if (err) | |
18147 | + au_fset_ren(a->flags, WHSRC); | |
1facf9fc | 18148 | + |
4a4d8108 AM |
18149 | + /* lock them all */ |
18150 | + err = au_ren_lock(a); | |
18151 | + if (unlikely(err)) | |
18152 | + goto out_children; | |
1facf9fc | 18153 | + |
4a4d8108 AM |
18154 | + if (!au_opt_test(au_mntflags(a->dst_dir->i_sb), UDBA_NONE)) |
18155 | + err = au_may_ren(a); | |
18156 | + else if (unlikely(a->dst_dentry->d_name.len > AUFS_MAX_NAMELEN)) | |
18157 | + err = -ENAMETOOLONG; | |
18158 | + if (unlikely(err)) | |
18159 | + goto out_hdir; | |
1facf9fc | 18160 | + |
4a4d8108 AM |
18161 | + /* store timestamps to be revertible */ |
18162 | + au_ren_dt(a); | |
1facf9fc | 18163 | + |
4a4d8108 AM |
18164 | + /* here we go */ |
18165 | + err = do_rename(a); | |
18166 | + if (unlikely(err)) | |
18167 | + goto out_dt; | |
18168 | + | |
18169 | + /* update dir attributes */ | |
18170 | + au_ren_refresh_dir(a); | |
18171 | + | |
18172 | + /* dput/iput all lower dentries */ | |
18173 | + au_ren_refresh(a); | |
18174 | + | |
18175 | + goto out_hdir; /* success */ | |
18176 | + | |
4f0767ce | 18177 | +out_dt: |
4a4d8108 | 18178 | + au_ren_rev_dt(err, a); |
4f0767ce | 18179 | +out_hdir: |
4a4d8108 | 18180 | + au_ren_unlock(a); |
4f0767ce | 18181 | +out_children: |
4a4d8108 | 18182 | + au_nhash_wh_free(&a->whlist); |
027c5e7a AM |
18183 | + if (err && a->dst_inode && a->dst_bstart != a->btgt) { |
18184 | + AuDbg("bstart %d, btgt %d\n", a->dst_bstart, a->btgt); | |
18185 | + au_set_h_dptr(a->dst_dentry, a->btgt, NULL); | |
18186 | + au_set_dbstart(a->dst_dentry, a->dst_bstart); | |
4a4d8108 | 18187 | + } |
027c5e7a | 18188 | +out_parent: |
4a4d8108 AM |
18189 | + if (!err) |
18190 | + d_move(a->src_dentry, a->dst_dentry); | |
027c5e7a AM |
18191 | + else { |
18192 | + au_update_dbstart(a->dst_dentry); | |
18193 | + if (!a->dst_inode) | |
18194 | + d_drop(a->dst_dentry); | |
18195 | + } | |
4a4d8108 AM |
18196 | + if (au_ftest_ren(a->flags, ISSAMEDIR)) |
18197 | + di_write_unlock(a->dst_parent); | |
18198 | + else | |
18199 | + di_write_unlock2(a->src_parent, a->dst_parent); | |
027c5e7a | 18200 | +out_unlock: |
4a4d8108 | 18201 | + aufs_read_and_write_unlock2(a->dst_dentry, a->src_dentry); |
4f0767ce | 18202 | +out_free: |
4a4d8108 AM |
18203 | + iput(a->dst_inode); |
18204 | + if (a->thargs) | |
18205 | + au_whtmp_rmdir_free(a->thargs); | |
18206 | + kfree(a); | |
4f0767ce | 18207 | +out: |
4a4d8108 AM |
18208 | + AuTraceErr(err); |
18209 | + return err; | |
1308ab2a | 18210 | +} |
7f207e10 AM |
18211 | diff -urN /usr/share/empty/fs/aufs/Kconfig linux/fs/aufs/Kconfig |
18212 | --- /usr/share/empty/fs/aufs/Kconfig 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18213 | +++ linux/fs/aufs/Kconfig 2011-08-24 13:30:24.727980364 +0200 |
2cbb1c4b | 18214 | @@ -0,0 +1,203 @@ |
4a4d8108 AM |
18215 | +config AUFS_FS |
18216 | + tristate "Aufs (Advanced multi layered unification filesystem) support" | |
18217 | + depends on EXPERIMENTAL | |
18218 | + help | |
18219 | + Aufs is a stackable unification filesystem such as Unionfs, | |
18220 | + which unifies several directories and provides a merged single | |
18221 | + directory. | |
18222 | + In the early days, aufs was entirely re-designed and | |
18223 | + re-implemented Unionfs Version 1.x series. Introducing many | |
18224 | + original ideas, approaches and improvements, it becomes totally | |
18225 | + different from Unionfs while keeping the basic features. | |
1facf9fc | 18226 | + |
4a4d8108 AM |
18227 | +if AUFS_FS |
18228 | +choice | |
18229 | + prompt "Maximum number of branches" | |
18230 | + default AUFS_BRANCH_MAX_127 | |
18231 | + help | |
18232 | + Specifies the maximum number of branches (or member directories) | |
18233 | + in a single aufs. The larger value consumes more system | |
18234 | + resources and has a minor impact to performance. | |
18235 | +config AUFS_BRANCH_MAX_127 | |
18236 | + bool "127" | |
18237 | + help | |
18238 | + Specifies the maximum number of branches (or member directories) | |
18239 | + in a single aufs. The larger value consumes more system | |
18240 | + resources and has a minor impact to performance. | |
18241 | +config AUFS_BRANCH_MAX_511 | |
18242 | + bool "511" | |
18243 | + help | |
18244 | + Specifies the maximum number of branches (or member directories) | |
18245 | + in a single aufs. The larger value consumes more system | |
18246 | + resources and has a minor impact to performance. | |
18247 | +config AUFS_BRANCH_MAX_1023 | |
18248 | + bool "1023" | |
18249 | + help | |
18250 | + Specifies the maximum number of branches (or member directories) | |
18251 | + in a single aufs. The larger value consumes more system | |
18252 | + resources and has a minor impact to performance. | |
18253 | +config AUFS_BRANCH_MAX_32767 | |
18254 | + bool "32767" | |
18255 | + help | |
18256 | + Specifies the maximum number of branches (or member directories) | |
18257 | + in a single aufs. The larger value consumes more system | |
18258 | + resources and has a minor impact to performance. | |
18259 | +endchoice | |
1facf9fc | 18260 | + |
e49829fe JR |
18261 | +config AUFS_SBILIST |
18262 | + bool | |
18263 | + depends on AUFS_MAGIC_SYSRQ || PROC_FS | |
18264 | + default y | |
18265 | + help | |
18266 | + Automatic configuration for internal use. | |
18267 | + When aufs supports Magic SysRq or /proc, enabled automatically. | |
18268 | + | |
4a4d8108 AM |
18269 | +config AUFS_HNOTIFY |
18270 | + bool "Detect direct branch access (bypassing aufs)" | |
18271 | + help | |
18272 | + If you want to modify files on branches directly, eg. bypassing aufs, | |
18273 | + and want aufs to detect the changes of them fully, then enable this | |
18274 | + option and use 'udba=notify' mount option. | |
7f207e10 | 18275 | + Currently there is only one available configuration, "fsnotify". |
4a4d8108 AM |
18276 | + It will have a negative impact to the performance. |
18277 | + See detail in aufs.5. | |
dece6358 | 18278 | + |
4a4d8108 AM |
18279 | +choice |
18280 | + prompt "method" if AUFS_HNOTIFY | |
18281 | + default AUFS_HFSNOTIFY | |
18282 | +config AUFS_HFSNOTIFY | |
18283 | + bool "fsnotify" | |
18284 | + select FSNOTIFY | |
4a4d8108 | 18285 | +endchoice |
1facf9fc | 18286 | + |
4a4d8108 AM |
18287 | +config AUFS_EXPORT |
18288 | + bool "NFS-exportable aufs" | |
2cbb1c4b | 18289 | + depends on EXPORTFS |
4a4d8108 AM |
18290 | + help |
18291 | + If you want to export your mounted aufs via NFS, then enable this | |
18292 | + option. There are several requirements for this configuration. | |
18293 | + See detail in aufs.5. | |
1facf9fc | 18294 | + |
4a4d8108 AM |
18295 | +config AUFS_INO_T_64 |
18296 | + bool | |
18297 | + depends on AUFS_EXPORT | |
18298 | + depends on 64BIT && !(ALPHA || S390) | |
18299 | + default y | |
18300 | + help | |
18301 | + Automatic configuration for internal use. | |
18302 | + /* typedef unsigned long/int __kernel_ino_t */ | |
18303 | + /* alpha and s390x are int */ | |
1facf9fc | 18304 | + |
4a4d8108 AM |
18305 | +config AUFS_RDU |
18306 | + bool "Readdir in userspace" | |
18307 | + help | |
18308 | + Aufs has two methods to provide a merged view for a directory, | |
18309 | + by a user-space library and by kernel-space natively. The latter | |
18310 | + is always enabled but sometimes large and slow. | |
18311 | + If you enable this option, install the library in aufs2-util | |
18312 | + package, and set some environment variables for your readdir(3), | |
18313 | + then the work will be handled in user-space which generally | |
18314 | + shows better performance in most cases. | |
18315 | + See detail in aufs.5. | |
1facf9fc | 18316 | + |
2cbb1c4b JR |
18317 | +config AUFS_PROC_MAP |
18318 | + bool "support for /proc/maps and lsof(1)" | |
18319 | + depends on PROC_FS | |
18320 | + help | |
18321 | + When you issue mmap(2) in aufs, it is actually a direct mmap(2) | |
18322 | + call to the file on the branch fs since the file in aufs is | |
18323 | + purely virtual. And the file path printed in /proc/maps (and | |
18324 | + others) will be the path on the branch fs. In most cases, it | |
18325 | + does no harm. But some utilities like lsof(1) may confuse since | |
18326 | + the utility or user may expect the file path in aufs to be | |
18327 | + printed. | |
18328 | + To address this issue, aufs provides a patch which introduces a | |
18329 | + new member called vm_prfile into struct vm_are_struct. The patch | |
18330 | + is meaningless without enabling this configuration since nobody | |
18331 | + sets the new vm_prfile member. | |
18332 | + If you don't apply the patch, then enabling this configuration | |
18333 | + will cause a compile error. | |
18334 | + This approach is fragile since if someone else make some changes | |
18335 | + around vm_file, then vm_prfile may not work anymore. As a | |
18336 | + workaround such case, aufs provides this configuration. If you | |
18337 | + disable it, then lsof(1) may produce incorrect result but the | |
18338 | + problem will be gone even if the aufs patch is applied (I hope). | |
18339 | + | |
4a4d8108 AM |
18340 | +config AUFS_SP_IATTR |
18341 | + bool "Respect the attributes (mtime/ctime mainly) of special files" | |
18342 | + help | |
18343 | + When you write something to a special file, some attributes of it | |
18344 | + (mtime/ctime mainly) may be updated. Generally such updates are | |
18345 | + less important (actually some device drivers and NFS ignore | |
18346 | + it). But some applications (such like test program) requires | |
18347 | + such updates. If you need these updates, then enable this | |
18348 | + configuration which introduces some overhead. | |
18349 | + Currently this configuration handles FIFO only. | |
1facf9fc | 18350 | + |
4a4d8108 AM |
18351 | +config AUFS_SHWH |
18352 | + bool "Show whiteouts" | |
18353 | + help | |
18354 | + If you want to make the whiteouts in aufs visible, then enable | |
18355 | + this option and specify 'shwh' mount option. Although it may | |
18356 | + sounds like philosophy or something, but in technically it | |
18357 | + simply shows the name of whiteout with keeping its behaviour. | |
1facf9fc | 18358 | + |
4a4d8108 AM |
18359 | +config AUFS_BR_RAMFS |
18360 | + bool "Ramfs (initramfs/rootfs) as an aufs branch" | |
18361 | + help | |
18362 | + If you want to use ramfs as an aufs branch fs, then enable this | |
18363 | + option. Generally tmpfs is recommended. | |
18364 | + Aufs prohibited them to be a branch fs by default, because | |
18365 | + initramfs becomes unusable after switch_root or something | |
18366 | + generally. If you sets initramfs as an aufs branch and boot your | |
18367 | + system by switch_root, you will meet a problem easily since the | |
18368 | + files in initramfs may be inaccessible. | |
18369 | + Unless you are going to use ramfs as an aufs branch fs without | |
18370 | + switch_root or something, leave it N. | |
1facf9fc | 18371 | + |
4a4d8108 AM |
18372 | +config AUFS_BR_FUSE |
18373 | + bool "Fuse fs as an aufs branch" | |
18374 | + depends on FUSE_FS | |
18375 | + select AUFS_POLL | |
18376 | + help | |
18377 | + If you want to use fuse-based userspace filesystem as an aufs | |
18378 | + branch fs, then enable this option. | |
18379 | + It implements the internal poll(2) operation which is | |
18380 | + implemented by fuse only (curretnly). | |
1facf9fc | 18381 | + |
4a4d8108 AM |
18382 | +config AUFS_POLL |
18383 | + bool | |
18384 | + help | |
18385 | + Automatic configuration for internal use. | |
1facf9fc | 18386 | + |
4a4d8108 AM |
18387 | +config AUFS_BR_HFSPLUS |
18388 | + bool "Hfsplus as an aufs branch" | |
18389 | + depends on HFSPLUS_FS | |
18390 | + default y | |
18391 | + help | |
18392 | + If you want to use hfsplus fs as an aufs branch fs, then enable | |
18393 | + this option. This option introduces a small overhead at | |
18394 | + copying-up a file on hfsplus. | |
1facf9fc | 18395 | + |
4a4d8108 AM |
18396 | +config AUFS_BDEV_LOOP |
18397 | + bool | |
18398 | + depends on BLK_DEV_LOOP | |
18399 | + default y | |
18400 | + help | |
18401 | + Automatic configuration for internal use. | |
18402 | + Convert =[ym] into =y. | |
1308ab2a | 18403 | + |
4a4d8108 AM |
18404 | +config AUFS_DEBUG |
18405 | + bool "Debug aufs" | |
18406 | + help | |
18407 | + Enable this to compile aufs internal debug code. | |
18408 | + It will have a negative impact to the performance. | |
18409 | + | |
18410 | +config AUFS_MAGIC_SYSRQ | |
18411 | + bool | |
18412 | + depends on AUFS_DEBUG && MAGIC_SYSRQ | |
18413 | + default y | |
18414 | + help | |
18415 | + Automatic configuration for internal use. | |
18416 | + When aufs supports Magic SysRq, enabled automatically. | |
18417 | +endif | |
7f207e10 AM |
18418 | diff -urN /usr/share/empty/fs/aufs/loop.c linux/fs/aufs/loop.c |
18419 | --- /usr/share/empty/fs/aufs/loop.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18420 | +++ linux/fs/aufs/loop.c 2011-08-24 13:30:24.734646739 +0200 |
87a755f4 | 18421 | @@ -0,0 +1,133 @@ |
1facf9fc | 18422 | +/* |
027c5e7a | 18423 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 18424 | + * |
18425 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18426 | + * it under the terms of the GNU General Public License as published by | |
18427 | + * the Free Software Foundation; either version 2 of the License, or | |
18428 | + * (at your option) any later version. | |
dece6358 AM |
18429 | + * |
18430 | + * This program is distributed in the hope that it will be useful, | |
18431 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18432 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18433 | + * GNU General Public License for more details. | |
18434 | + * | |
18435 | + * You should have received a copy of the GNU General Public License | |
18436 | + * along with this program; if not, write to the Free Software | |
18437 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18438 | + */ |
18439 | + | |
18440 | +/* | |
18441 | + * support for loopback block device as a branch | |
18442 | + */ | |
18443 | + | |
18444 | +#include <linux/loop.h> | |
18445 | +#include "aufs.h" | |
18446 | + | |
18447 | +/* | |
18448 | + * test if two lower dentries have overlapping branches. | |
18449 | + */ | |
b752ccd1 | 18450 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding) |
1facf9fc | 18451 | +{ |
b752ccd1 | 18452 | + struct super_block *h_sb; |
1facf9fc | 18453 | + struct loop_device *l; |
18454 | + | |
b752ccd1 AM |
18455 | + h_sb = h_adding->d_sb; |
18456 | + if (MAJOR(h_sb->s_dev) != LOOP_MAJOR) | |
1facf9fc | 18457 | + return 0; |
18458 | + | |
b752ccd1 AM |
18459 | + l = h_sb->s_bdev->bd_disk->private_data; |
18460 | + h_adding = l->lo_backing_file->f_dentry; | |
18461 | + /* | |
18462 | + * h_adding can be local NFS. | |
18463 | + * in this case aufs cannot detect the loop. | |
18464 | + */ | |
18465 | + if (unlikely(h_adding->d_sb == sb)) | |
1facf9fc | 18466 | + return 1; |
b752ccd1 | 18467 | + return !!au_test_subdir(h_adding, sb->s_root); |
1facf9fc | 18468 | +} |
18469 | + | |
18470 | +/* true if a kernel thread named 'loop[0-9].*' accesses a file */ | |
18471 | +int au_test_loopback_kthread(void) | |
18472 | +{ | |
b752ccd1 AM |
18473 | + int ret; |
18474 | + struct task_struct *tsk = current; | |
18475 | + | |
18476 | + ret = 0; | |
18477 | + if (tsk->flags & PF_KTHREAD) { | |
18478 | + const char c = tsk->comm[4]; | |
18479 | + ret = ('0' <= c && c <= '9' | |
18480 | + && !strncmp(tsk->comm, "loop", 4)); | |
18481 | + } | |
1facf9fc | 18482 | + |
b752ccd1 | 18483 | + return ret; |
1facf9fc | 18484 | +} |
87a755f4 AM |
18485 | + |
18486 | +/* ---------------------------------------------------------------------- */ | |
18487 | + | |
18488 | +#define au_warn_loopback_step 16 | |
18489 | +static int au_warn_loopback_nelem = au_warn_loopback_step; | |
18490 | +static unsigned long *au_warn_loopback_array; | |
18491 | + | |
18492 | +void au_warn_loopback(struct super_block *h_sb) | |
18493 | +{ | |
18494 | + int i, new_nelem; | |
18495 | + unsigned long *a, magic; | |
18496 | + static DEFINE_SPINLOCK(spin); | |
18497 | + | |
18498 | + magic = h_sb->s_magic; | |
18499 | + spin_lock(&spin); | |
18500 | + a = au_warn_loopback_array; | |
18501 | + for (i = 0; i < au_warn_loopback_nelem && *a; i++) | |
18502 | + if (a[i] == magic) { | |
18503 | + spin_unlock(&spin); | |
18504 | + return; | |
18505 | + } | |
18506 | + | |
18507 | + /* h_sb is new to us, print it */ | |
18508 | + if (i < au_warn_loopback_nelem) { | |
18509 | + a[i] = magic; | |
18510 | + goto pr; | |
18511 | + } | |
18512 | + | |
18513 | + /* expand the array */ | |
18514 | + new_nelem = au_warn_loopback_nelem + au_warn_loopback_step; | |
18515 | + a = au_kzrealloc(au_warn_loopback_array, | |
18516 | + au_warn_loopback_nelem * sizeof(unsigned long), | |
18517 | + new_nelem * sizeof(unsigned long), GFP_ATOMIC); | |
18518 | + if (a) { | |
18519 | + au_warn_loopback_nelem = new_nelem; | |
18520 | + au_warn_loopback_array = a; | |
18521 | + a[i] = magic; | |
18522 | + goto pr; | |
18523 | + } | |
18524 | + | |
18525 | + spin_unlock(&spin); | |
18526 | + AuWarn1("realloc failed, ignored\n"); | |
18527 | + return; | |
18528 | + | |
18529 | +pr: | |
18530 | + spin_unlock(&spin); | |
18531 | + pr_warning("you may want to try another patch for loopback file " | |
18532 | + "on %s(0x%lx) branch\n", au_sbtype(h_sb), magic); | |
18533 | +} | |
18534 | + | |
18535 | +int au_loopback_init(void) | |
18536 | +{ | |
18537 | + int err; | |
18538 | + struct super_block *sb __maybe_unused; | |
18539 | + | |
18540 | + AuDebugOn(sizeof(sb->s_magic) != sizeof(unsigned long)); | |
18541 | + | |
18542 | + err = 0; | |
18543 | + au_warn_loopback_array = kcalloc(au_warn_loopback_step, | |
18544 | + sizeof(unsigned long), GFP_NOFS); | |
18545 | + if (unlikely(!au_warn_loopback_array)) | |
18546 | + err = -ENOMEM; | |
18547 | + | |
18548 | + return err; | |
18549 | +} | |
18550 | + | |
18551 | +void au_loopback_fin(void) | |
18552 | +{ | |
18553 | + kfree(au_warn_loopback_array); | |
18554 | +} | |
7f207e10 AM |
18555 | diff -urN /usr/share/empty/fs/aufs/loop.h linux/fs/aufs/loop.h |
18556 | --- /usr/share/empty/fs/aufs/loop.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18557 | +++ linux/fs/aufs/loop.h 2011-08-24 13:30:24.734646739 +0200 |
87a755f4 | 18558 | @@ -0,0 +1,50 @@ |
1facf9fc | 18559 | +/* |
027c5e7a | 18560 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 18561 | + * |
18562 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18563 | + * it under the terms of the GNU General Public License as published by | |
18564 | + * the Free Software Foundation; either version 2 of the License, or | |
18565 | + * (at your option) any later version. | |
dece6358 AM |
18566 | + * |
18567 | + * This program is distributed in the hope that it will be useful, | |
18568 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18569 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18570 | + * GNU General Public License for more details. | |
18571 | + * | |
18572 | + * You should have received a copy of the GNU General Public License | |
18573 | + * along with this program; if not, write to the Free Software | |
18574 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18575 | + */ |
18576 | + | |
18577 | +/* | |
18578 | + * support for loopback mount as a branch | |
18579 | + */ | |
18580 | + | |
18581 | +#ifndef __AUFS_LOOP_H__ | |
18582 | +#define __AUFS_LOOP_H__ | |
18583 | + | |
18584 | +#ifdef __KERNEL__ | |
18585 | + | |
dece6358 AM |
18586 | +struct dentry; |
18587 | +struct super_block; | |
1facf9fc | 18588 | + |
18589 | +#ifdef CONFIG_AUFS_BDEV_LOOP | |
18590 | +/* loop.c */ | |
b752ccd1 | 18591 | +int au_test_loopback_overlap(struct super_block *sb, struct dentry *h_adding); |
1facf9fc | 18592 | +int au_test_loopback_kthread(void); |
87a755f4 AM |
18593 | +void au_warn_loopback(struct super_block *h_sb); |
18594 | + | |
18595 | +int au_loopback_init(void); | |
18596 | +void au_loopback_fin(void); | |
1facf9fc | 18597 | +#else |
4a4d8108 | 18598 | +AuStubInt0(au_test_loopback_overlap, struct super_block *sb, |
b752ccd1 | 18599 | + struct dentry *h_adding) |
4a4d8108 | 18600 | +AuStubInt0(au_test_loopback_kthread, void) |
87a755f4 AM |
18601 | +AuStubVoid(au_warn_loopback, struct super_block *h_sb) |
18602 | + | |
18603 | +AuStubInt0(au_loopback_init, void) | |
18604 | +AuStubVoid(au_loopback_fin, void) | |
1facf9fc | 18605 | +#endif /* BLK_DEV_LOOP */ |
18606 | + | |
18607 | +#endif /* __KERNEL__ */ | |
18608 | +#endif /* __AUFS_LOOP_H__ */ | |
7f207e10 AM |
18609 | diff -urN /usr/share/empty/fs/aufs/magic.mk linux/fs/aufs/magic.mk |
18610 | --- /usr/share/empty/fs/aufs/magic.mk 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18611 | +++ linux/fs/aufs/magic.mk 2011-08-24 13:30:24.734646739 +0200 |
4a4d8108 | 18612 | @@ -0,0 +1,54 @@ |
1facf9fc | 18613 | + |
18614 | +# defined in ${srctree}/fs/fuse/inode.c | |
18615 | +# tristate | |
18616 | +ifdef CONFIG_FUSE_FS | |
18617 | +ccflags-y += -DFUSE_SUPER_MAGIC=0x65735546 | |
18618 | +endif | |
18619 | + | |
18620 | +# defined in ${srctree}/fs/ocfs2/ocfs2_fs.h | |
18621 | +# tristate | |
18622 | +ifdef CONFIG_OCFS2_FS | |
18623 | +ccflags-y += -DOCFS2_SUPER_MAGIC=0x7461636f | |
18624 | +endif | |
18625 | + | |
18626 | +# defined in ${srctree}/fs/ocfs2/dlm/userdlm.h | |
18627 | +# tristate | |
18628 | +ifdef CONFIG_OCFS2_FS_O2CB | |
18629 | +ccflags-y += -DDLMFS_MAGIC=0x76a9f425 | |
18630 | +endif | |
18631 | + | |
1facf9fc | 18632 | +# defined in ${srctree}/fs/cifs/cifsfs.c |
18633 | +# tristate | |
18634 | +ifdef CONFIG_CIFS_FS | |
18635 | +ccflags-y += -DCIFS_MAGIC_NUMBER=0xFF534D42 | |
18636 | +endif | |
18637 | + | |
18638 | +# defined in ${srctree}/fs/xfs/xfs_sb.h | |
18639 | +# tristate | |
18640 | +ifdef CONFIG_XFS_FS | |
18641 | +ccflags-y += -DXFS_SB_MAGIC=0x58465342 | |
18642 | +endif | |
18643 | + | |
18644 | +# defined in ${srctree}/fs/configfs/mount.c | |
18645 | +# tristate | |
18646 | +ifdef CONFIG_CONFIGFS_FS | |
18647 | +ccflags-y += -DCONFIGFS_MAGIC=0x62656570 | |
18648 | +endif | |
18649 | + | |
18650 | +# defined in ${srctree}/fs/9p/v9fs.h | |
18651 | +# tristate | |
18652 | +ifdef CONFIG_9P_FS | |
18653 | +ccflags-y += -DV9FS_MAGIC=0x01021997 | |
18654 | +endif | |
18655 | + | |
18656 | +# defined in ${srctree}/fs/ubifs/ubifs.h | |
18657 | +# tristate | |
18658 | +ifdef CONFIG_UBIFS_FS | |
18659 | +ccflags-y += -DUBIFS_SUPER_MAGIC=0x24051905 | |
18660 | +endif | |
4a4d8108 AM |
18661 | + |
18662 | +# defined in ${srctree}/fs/hfsplus/hfsplus_raw.h | |
18663 | +# tristate | |
18664 | +ifdef CONFIG_HFSPLUS_FS | |
18665 | +ccflags-y += -DHFSPLUS_SUPER_MAGIC=0x482b | |
18666 | +endif | |
7f207e10 AM |
18667 | diff -urN /usr/share/empty/fs/aufs/Makefile linux/fs/aufs/Makefile |
18668 | --- /usr/share/empty/fs/aufs/Makefile 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18669 | +++ linux/fs/aufs/Makefile 2011-08-24 13:30:24.727980364 +0200 |
7f207e10 | 18670 | @@ -0,0 +1,38 @@ |
4a4d8108 AM |
18671 | + |
18672 | +include ${src}/magic.mk | |
18673 | +ifeq (${CONFIG_AUFS_FS},m) | |
18674 | +include ${src}/conf.mk | |
18675 | +endif | |
18676 | +-include ${src}/priv_def.mk | |
18677 | + | |
18678 | +# cf. include/linux/kernel.h | |
18679 | +# enable pr_debug | |
18680 | +ccflags-y += -DDEBUG | |
7f207e10 AM |
18681 | +# sparse doesn't allow spaces |
18682 | +ccflags-y += -D'pr_fmt(fmt)=AUFS_NAME"\040%s:%d:%s[%d]:\040"fmt,__func__,__LINE__,current->comm,current->pid' | |
4a4d8108 AM |
18683 | + |
18684 | +obj-$(CONFIG_AUFS_FS) += aufs.o | |
18685 | +aufs-y := module.o sbinfo.o super.o branch.o xino.o sysaufs.o opts.o \ | |
18686 | + wkq.o vfsub.o dcsub.o \ | |
e49829fe | 18687 | + cpup.o whout.o wbr_policy.o \ |
4a4d8108 AM |
18688 | + dinfo.o dentry.o \ |
18689 | + dynop.o \ | |
18690 | + finfo.o file.o f_op.o \ | |
18691 | + dir.o vdir.o \ | |
18692 | + iinfo.o inode.o i_op.o i_op_add.o i_op_del.o i_op_ren.o \ | |
18693 | + ioctl.o | |
18694 | + | |
18695 | +# all are boolean | |
e49829fe | 18696 | +aufs-$(CONFIG_PROC_FS) += procfs.o plink.o |
4a4d8108 AM |
18697 | +aufs-$(CONFIG_SYSFS) += sysfs.o |
18698 | +aufs-$(CONFIG_DEBUG_FS) += dbgaufs.o | |
18699 | +aufs-$(CONFIG_AUFS_BDEV_LOOP) += loop.o | |
18700 | +aufs-$(CONFIG_AUFS_HNOTIFY) += hnotify.o | |
18701 | +aufs-$(CONFIG_AUFS_HFSNOTIFY) += hfsnotify.o | |
4a4d8108 AM |
18702 | +aufs-$(CONFIG_AUFS_EXPORT) += export.o |
18703 | +aufs-$(CONFIG_AUFS_POLL) += poll.o | |
18704 | +aufs-$(CONFIG_AUFS_RDU) += rdu.o | |
18705 | +aufs-$(CONFIG_AUFS_SP_IATTR) += f_op_sp.o | |
18706 | +aufs-$(CONFIG_AUFS_BR_HFSPLUS) += hfsplus.o | |
18707 | +aufs-$(CONFIG_AUFS_DEBUG) += debug.o | |
18708 | +aufs-$(CONFIG_AUFS_MAGIC_SYSRQ) += sysrq.o | |
7f207e10 AM |
18709 | diff -urN /usr/share/empty/fs/aufs/module.c linux/fs/aufs/module.c |
18710 | --- /usr/share/empty/fs/aufs/module.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18711 | +++ linux/fs/aufs/module.c 2011-08-24 13:30:24.734646739 +0200 |
87a755f4 | 18712 | @@ -0,0 +1,189 @@ |
1facf9fc | 18713 | +/* |
027c5e7a | 18714 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 18715 | + * |
18716 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18717 | + * it under the terms of the GNU General Public License as published by | |
18718 | + * the Free Software Foundation; either version 2 of the License, or | |
18719 | + * (at your option) any later version. | |
dece6358 AM |
18720 | + * |
18721 | + * This program is distributed in the hope that it will be useful, | |
18722 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18723 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18724 | + * GNU General Public License for more details. | |
18725 | + * | |
18726 | + * You should have received a copy of the GNU General Public License | |
18727 | + * along with this program; if not, write to the Free Software | |
18728 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18729 | + */ |
18730 | + | |
18731 | +/* | |
18732 | + * module global variables and operations | |
18733 | + */ | |
18734 | + | |
18735 | +#include <linux/module.h> | |
18736 | +#include <linux/seq_file.h> | |
18737 | +#include "aufs.h" | |
18738 | + | |
18739 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp) | |
18740 | +{ | |
18741 | + if (new_sz <= nused) | |
18742 | + return p; | |
18743 | + | |
18744 | + p = krealloc(p, new_sz, gfp); | |
18745 | + if (p) | |
18746 | + memset(p + nused, 0, new_sz - nused); | |
18747 | + return p; | |
18748 | +} | |
18749 | + | |
18750 | +/* ---------------------------------------------------------------------- */ | |
18751 | + | |
18752 | +/* | |
18753 | + * aufs caches | |
18754 | + */ | |
18755 | +struct kmem_cache *au_cachep[AuCache_Last]; | |
18756 | +static int __init au_cache_init(void) | |
18757 | +{ | |
4a4d8108 | 18758 | + au_cachep[AuCache_DINFO] = AuCacheCtor(au_dinfo, au_di_init_once); |
1facf9fc | 18759 | + if (au_cachep[AuCache_DINFO]) |
027c5e7a | 18760 | + /* SLAB_DESTROY_BY_RCU */ |
4a4d8108 AM |
18761 | + au_cachep[AuCache_ICNTNR] = AuCacheCtor(au_icntnr, |
18762 | + au_icntnr_init_once); | |
1facf9fc | 18763 | + if (au_cachep[AuCache_ICNTNR]) |
4a4d8108 AM |
18764 | + au_cachep[AuCache_FINFO] = AuCacheCtor(au_finfo, |
18765 | + au_fi_init_once); | |
1facf9fc | 18766 | + if (au_cachep[AuCache_FINFO]) |
18767 | + au_cachep[AuCache_VDIR] = AuCache(au_vdir); | |
18768 | + if (au_cachep[AuCache_VDIR]) | |
18769 | + au_cachep[AuCache_DEHSTR] = AuCache(au_vdir_dehstr); | |
18770 | + if (au_cachep[AuCache_DEHSTR]) | |
18771 | + return 0; | |
18772 | + | |
18773 | + return -ENOMEM; | |
18774 | +} | |
18775 | + | |
18776 | +static void au_cache_fin(void) | |
18777 | +{ | |
18778 | + int i; | |
4a4d8108 AM |
18779 | + |
18780 | + /* including AuCache_HNOTIFY */ | |
1facf9fc | 18781 | + for (i = 0; i < AuCache_Last; i++) |
18782 | + if (au_cachep[i]) { | |
18783 | + kmem_cache_destroy(au_cachep[i]); | |
18784 | + au_cachep[i] = NULL; | |
18785 | + } | |
18786 | +} | |
18787 | + | |
18788 | +/* ---------------------------------------------------------------------- */ | |
18789 | + | |
18790 | +int au_dir_roflags; | |
18791 | + | |
e49829fe JR |
18792 | +#ifdef CONFIG_AUFS_SBILIST |
18793 | +struct au_splhead au_sbilist; | |
18794 | +#endif | |
18795 | + | |
1facf9fc | 18796 | +/* |
18797 | + * functions for module interface. | |
18798 | + */ | |
18799 | +MODULE_LICENSE("GPL"); | |
18800 | +/* MODULE_LICENSE("GPL v2"); */ | |
dece6358 | 18801 | +MODULE_AUTHOR("Junjiro R. Okajima <aufs-users@lists.sourceforge.net>"); |
1facf9fc | 18802 | +MODULE_DESCRIPTION(AUFS_NAME |
18803 | + " -- Advanced multi layered unification filesystem"); | |
18804 | +MODULE_VERSION(AUFS_VERSION); | |
18805 | + | |
1facf9fc | 18806 | +/* this module parameter has no meaning when SYSFS is disabled */ |
18807 | +int sysaufs_brs = 1; | |
18808 | +MODULE_PARM_DESC(brs, "use <sysfs>/fs/aufs/si_*/brN"); | |
18809 | +module_param_named(brs, sysaufs_brs, int, S_IRUGO); | |
18810 | + | |
18811 | +/* ---------------------------------------------------------------------- */ | |
18812 | + | |
18813 | +static char au_esc_chars[0x20 + 3]; /* 0x01-0x20, backslash, del, and NULL */ | |
18814 | + | |
18815 | +int au_seq_path(struct seq_file *seq, struct path *path) | |
18816 | +{ | |
18817 | + return seq_path(seq, path, au_esc_chars); | |
18818 | +} | |
18819 | + | |
18820 | +/* ---------------------------------------------------------------------- */ | |
18821 | + | |
18822 | +static int __init aufs_init(void) | |
18823 | +{ | |
18824 | + int err, i; | |
18825 | + char *p; | |
18826 | + | |
18827 | + p = au_esc_chars; | |
18828 | + for (i = 1; i <= ' '; i++) | |
18829 | + *p++ = i; | |
18830 | + *p++ = '\\'; | |
18831 | + *p++ = '\x7f'; | |
18832 | + *p = 0; | |
18833 | + | |
18834 | + au_dir_roflags = au_file_roflags(O_DIRECTORY | O_LARGEFILE); | |
18835 | + | |
e49829fe | 18836 | + au_sbilist_init(); |
1facf9fc | 18837 | + sysaufs_brs_init(); |
18838 | + au_debug_init(); | |
4a4d8108 | 18839 | + au_dy_init(); |
1facf9fc | 18840 | + err = sysaufs_init(); |
18841 | + if (unlikely(err)) | |
18842 | + goto out; | |
e49829fe | 18843 | + err = au_procfs_init(); |
4f0767ce | 18844 | + if (unlikely(err)) |
953406b4 | 18845 | + goto out_sysaufs; |
e49829fe JR |
18846 | + err = au_wkq_init(); |
18847 | + if (unlikely(err)) | |
18848 | + goto out_procfs; | |
87a755f4 | 18849 | + err = au_loopback_init(); |
1facf9fc | 18850 | + if (unlikely(err)) |
18851 | + goto out_wkq; | |
87a755f4 AM |
18852 | + err = au_hnotify_init(); |
18853 | + if (unlikely(err)) | |
18854 | + goto out_loopback; | |
1facf9fc | 18855 | + err = au_sysrq_init(); |
18856 | + if (unlikely(err)) | |
18857 | + goto out_hin; | |
18858 | + err = au_cache_init(); | |
18859 | + if (unlikely(err)) | |
18860 | + goto out_sysrq; | |
18861 | + err = register_filesystem(&aufs_fs_type); | |
18862 | + if (unlikely(err)) | |
18863 | + goto out_cache; | |
4a4d8108 AM |
18864 | + /* since we define pr_fmt, call printk directly */ |
18865 | + printk(KERN_INFO AUFS_NAME " " AUFS_VERSION "\n"); | |
1facf9fc | 18866 | + goto out; /* success */ |
18867 | + | |
4f0767ce | 18868 | +out_cache: |
1facf9fc | 18869 | + au_cache_fin(); |
4f0767ce | 18870 | +out_sysrq: |
1facf9fc | 18871 | + au_sysrq_fin(); |
4f0767ce | 18872 | +out_hin: |
4a4d8108 | 18873 | + au_hnotify_fin(); |
87a755f4 AM |
18874 | +out_loopback: |
18875 | + au_loopback_fin(); | |
4f0767ce | 18876 | +out_wkq: |
1facf9fc | 18877 | + au_wkq_fin(); |
e49829fe JR |
18878 | +out_procfs: |
18879 | + au_procfs_fin(); | |
4f0767ce | 18880 | +out_sysaufs: |
1facf9fc | 18881 | + sysaufs_fin(); |
4a4d8108 | 18882 | + au_dy_fin(); |
4f0767ce | 18883 | +out: |
1facf9fc | 18884 | + return err; |
18885 | +} | |
18886 | + | |
18887 | +static void __exit aufs_exit(void) | |
18888 | +{ | |
18889 | + unregister_filesystem(&aufs_fs_type); | |
18890 | + au_cache_fin(); | |
18891 | + au_sysrq_fin(); | |
4a4d8108 | 18892 | + au_hnotify_fin(); |
87a755f4 | 18893 | + au_loopback_fin(); |
1facf9fc | 18894 | + au_wkq_fin(); |
e49829fe | 18895 | + au_procfs_fin(); |
1facf9fc | 18896 | + sysaufs_fin(); |
4a4d8108 | 18897 | + au_dy_fin(); |
1facf9fc | 18898 | +} |
18899 | + | |
18900 | +module_init(aufs_init); | |
18901 | +module_exit(aufs_exit); | |
7f207e10 AM |
18902 | diff -urN /usr/share/empty/fs/aufs/module.h linux/fs/aufs/module.h |
18903 | --- /usr/share/empty/fs/aufs/module.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18904 | +++ linux/fs/aufs/module.h 2011-08-24 13:30:24.734646739 +0200 |
e49829fe | 18905 | @@ -0,0 +1,91 @@ |
1facf9fc | 18906 | +/* |
027c5e7a | 18907 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 18908 | + * |
18909 | + * This program, aufs is free software; you can redistribute it and/or modify | |
18910 | + * it under the terms of the GNU General Public License as published by | |
18911 | + * the Free Software Foundation; either version 2 of the License, or | |
18912 | + * (at your option) any later version. | |
dece6358 AM |
18913 | + * |
18914 | + * This program is distributed in the hope that it will be useful, | |
18915 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
18916 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18917 | + * GNU General Public License for more details. | |
18918 | + * | |
18919 | + * You should have received a copy of the GNU General Public License | |
18920 | + * along with this program; if not, write to the Free Software | |
18921 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 18922 | + */ |
18923 | + | |
18924 | +/* | |
18925 | + * module initialization and module-global | |
18926 | + */ | |
18927 | + | |
18928 | +#ifndef __AUFS_MODULE_H__ | |
18929 | +#define __AUFS_MODULE_H__ | |
18930 | + | |
18931 | +#ifdef __KERNEL__ | |
18932 | + | |
18933 | +#include <linux/slab.h> | |
18934 | + | |
dece6358 AM |
18935 | +struct path; |
18936 | +struct seq_file; | |
18937 | + | |
1facf9fc | 18938 | +/* module parameters */ |
1facf9fc | 18939 | +extern int sysaufs_brs; |
18940 | + | |
18941 | +/* ---------------------------------------------------------------------- */ | |
18942 | + | |
18943 | +extern int au_dir_roflags; | |
18944 | + | |
18945 | +void *au_kzrealloc(void *p, unsigned int nused, unsigned int new_sz, gfp_t gfp); | |
18946 | +int au_seq_path(struct seq_file *seq, struct path *path); | |
18947 | + | |
e49829fe JR |
18948 | +#ifdef CONFIG_PROC_FS |
18949 | +/* procfs.c */ | |
18950 | +int __init au_procfs_init(void); | |
18951 | +void au_procfs_fin(void); | |
18952 | +#else | |
18953 | +AuStubInt0(au_procfs_init, void); | |
18954 | +AuStubVoid(au_procfs_fin, void); | |
18955 | +#endif | |
18956 | + | |
4f0767ce JR |
18957 | +/* ---------------------------------------------------------------------- */ |
18958 | + | |
18959 | +/* kmem cache */ | |
1facf9fc | 18960 | +enum { |
18961 | + AuCache_DINFO, | |
18962 | + AuCache_ICNTNR, | |
18963 | + AuCache_FINFO, | |
18964 | + AuCache_VDIR, | |
18965 | + AuCache_DEHSTR, | |
4a4d8108 AM |
18966 | +#ifdef CONFIG_AUFS_HNOTIFY |
18967 | + AuCache_HNOTIFY, | |
1facf9fc | 18968 | +#endif |
18969 | + AuCache_Last | |
18970 | +}; | |
18971 | + | |
4a4d8108 AM |
18972 | +#define AuCacheFlags (SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD) |
18973 | +#define AuCache(type) KMEM_CACHE(type, AuCacheFlags) | |
18974 | +#define AuCacheCtor(type, ctor) \ | |
18975 | + kmem_cache_create(#type, sizeof(struct type), \ | |
18976 | + __alignof__(struct type), AuCacheFlags, ctor) | |
1facf9fc | 18977 | + |
18978 | +extern struct kmem_cache *au_cachep[]; | |
18979 | + | |
18980 | +#define AuCacheFuncs(name, index) \ | |
4a4d8108 | 18981 | +static inline struct au_##name *au_cache_alloc_##name(void) \ |
1facf9fc | 18982 | +{ return kmem_cache_alloc(au_cachep[AuCache_##index], GFP_NOFS); } \ |
4a4d8108 | 18983 | +static inline void au_cache_free_##name(struct au_##name *p) \ |
1facf9fc | 18984 | +{ kmem_cache_free(au_cachep[AuCache_##index], p); } |
18985 | + | |
18986 | +AuCacheFuncs(dinfo, DINFO); | |
18987 | +AuCacheFuncs(icntnr, ICNTNR); | |
18988 | +AuCacheFuncs(finfo, FINFO); | |
18989 | +AuCacheFuncs(vdir, VDIR); | |
4a4d8108 AM |
18990 | +AuCacheFuncs(vdir_dehstr, DEHSTR); |
18991 | +#ifdef CONFIG_AUFS_HNOTIFY | |
18992 | +AuCacheFuncs(hnotify, HNOTIFY); | |
18993 | +#endif | |
1facf9fc | 18994 | + |
4a4d8108 AM |
18995 | +#endif /* __KERNEL__ */ |
18996 | +#endif /* __AUFS_MODULE_H__ */ | |
7f207e10 AM |
18997 | diff -urN /usr/share/empty/fs/aufs/opts.c linux/fs/aufs/opts.c |
18998 | --- /usr/share/empty/fs/aufs/opts.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 18999 | +++ linux/fs/aufs/opts.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 19000 | @@ -0,0 +1,1595 @@ |
1facf9fc | 19001 | +/* |
027c5e7a | 19002 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 19003 | + * |
19004 | + * This program, aufs is free software; you can redistribute it and/or modify | |
19005 | + * it under the terms of the GNU General Public License as published by | |
19006 | + * the Free Software Foundation; either version 2 of the License, or | |
19007 | + * (at your option) any later version. | |
dece6358 AM |
19008 | + * |
19009 | + * This program is distributed in the hope that it will be useful, | |
19010 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
19011 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
19012 | + * GNU General Public License for more details. | |
19013 | + * | |
19014 | + * You should have received a copy of the GNU General Public License | |
19015 | + * along with this program; if not, write to the Free Software | |
19016 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 19017 | + */ |
19018 | + | |
19019 | +/* | |
19020 | + * mount options/flags | |
19021 | + */ | |
19022 | + | |
dece6358 | 19023 | +#include <linux/file.h> |
e49829fe | 19024 | +#include <linux/jiffies.h> |
dece6358 | 19025 | +#include <linux/namei.h> |
1facf9fc | 19026 | +#include <linux/types.h> /* a distribution requires */ |
19027 | +#include <linux/parser.h> | |
19028 | +#include "aufs.h" | |
19029 | + | |
19030 | +/* ---------------------------------------------------------------------- */ | |
19031 | + | |
19032 | +enum { | |
19033 | + Opt_br, | |
19034 | + Opt_add, Opt_del, Opt_mod, Opt_reorder, Opt_append, Opt_prepend, | |
19035 | + Opt_idel, Opt_imod, Opt_ireorder, | |
19036 | + Opt_dirwh, Opt_rdcache, Opt_rdblk, Opt_rdhash, Opt_rendir, | |
dece6358 | 19037 | + Opt_rdblk_def, Opt_rdhash_def, |
1facf9fc | 19038 | + Opt_xino, Opt_zxino, Opt_noxino, |
19039 | + Opt_trunc_xino, Opt_trunc_xino_v, Opt_notrunc_xino, | |
19040 | + Opt_trunc_xino_path, Opt_itrunc_xino, | |
19041 | + Opt_trunc_xib, Opt_notrunc_xib, | |
dece6358 | 19042 | + Opt_shwh, Opt_noshwh, |
1facf9fc | 19043 | + Opt_plink, Opt_noplink, Opt_list_plink, |
19044 | + Opt_udba, | |
4a4d8108 | 19045 | + Opt_dio, Opt_nodio, |
1facf9fc | 19046 | + /* Opt_lock, Opt_unlock, */ |
19047 | + Opt_cmd, Opt_cmd_args, | |
19048 | + Opt_diropq_a, Opt_diropq_w, | |
19049 | + Opt_warn_perm, Opt_nowarn_perm, | |
19050 | + Opt_wbr_copyup, Opt_wbr_create, | |
19051 | + Opt_refrof, Opt_norefrof, | |
19052 | + Opt_verbose, Opt_noverbose, | |
19053 | + Opt_sum, Opt_nosum, Opt_wsum, | |
19054 | + Opt_tail, Opt_ignore, Opt_ignore_silent, Opt_err | |
19055 | +}; | |
19056 | + | |
19057 | +static match_table_t options = { | |
19058 | + {Opt_br, "br=%s"}, | |
19059 | + {Opt_br, "br:%s"}, | |
19060 | + | |
19061 | + {Opt_add, "add=%d:%s"}, | |
19062 | + {Opt_add, "add:%d:%s"}, | |
19063 | + {Opt_add, "ins=%d:%s"}, | |
19064 | + {Opt_add, "ins:%d:%s"}, | |
19065 | + {Opt_append, "append=%s"}, | |
19066 | + {Opt_append, "append:%s"}, | |
19067 | + {Opt_prepend, "prepend=%s"}, | |
19068 | + {Opt_prepend, "prepend:%s"}, | |
19069 | + | |
19070 | + {Opt_del, "del=%s"}, | |
19071 | + {Opt_del, "del:%s"}, | |
19072 | + /* {Opt_idel, "idel:%d"}, */ | |
19073 | + {Opt_mod, "mod=%s"}, | |
19074 | + {Opt_mod, "mod:%s"}, | |
19075 | + /* {Opt_imod, "imod:%d:%s"}, */ | |
19076 | + | |
19077 | + {Opt_dirwh, "dirwh=%d"}, | |
19078 | + | |
19079 | + {Opt_xino, "xino=%s"}, | |
19080 | + {Opt_noxino, "noxino"}, | |
19081 | + {Opt_trunc_xino, "trunc_xino"}, | |
19082 | + {Opt_trunc_xino_v, "trunc_xino_v=%d:%d"}, | |
19083 | + {Opt_notrunc_xino, "notrunc_xino"}, | |
19084 | + {Opt_trunc_xino_path, "trunc_xino=%s"}, | |
19085 | + {Opt_itrunc_xino, "itrunc_xino=%d"}, | |
19086 | + /* {Opt_zxino, "zxino=%s"}, */ | |
19087 | + {Opt_trunc_xib, "trunc_xib"}, | |
19088 | + {Opt_notrunc_xib, "notrunc_xib"}, | |
19089 | + | |
e49829fe | 19090 | +#ifdef CONFIG_PROC_FS |
1facf9fc | 19091 | + {Opt_plink, "plink"}, |
e49829fe JR |
19092 | +#else |
19093 | + {Opt_ignore_silent, "plink"}, | |
19094 | +#endif | |
19095 | + | |
1facf9fc | 19096 | + {Opt_noplink, "noplink"}, |
e49829fe | 19097 | + |
1facf9fc | 19098 | +#ifdef CONFIG_AUFS_DEBUG |
19099 | + {Opt_list_plink, "list_plink"}, | |
19100 | +#endif | |
19101 | + | |
19102 | + {Opt_udba, "udba=%s"}, | |
19103 | + | |
4a4d8108 AM |
19104 | + {Opt_dio, "dio"}, |
19105 | + {Opt_nodio, "nodio"}, | |
19106 | + | |
1facf9fc | 19107 | + {Opt_diropq_a, "diropq=always"}, |
19108 | + {Opt_diropq_a, "diropq=a"}, | |
19109 | + {Opt_diropq_w, "diropq=whiteouted"}, | |
19110 | + {Opt_diropq_w, "diropq=w"}, | |
19111 | + | |
19112 | + {Opt_warn_perm, "warn_perm"}, | |
19113 | + {Opt_nowarn_perm, "nowarn_perm"}, | |
19114 | + | |
19115 | + /* keep them temporary */ | |
19116 | + {Opt_ignore_silent, "coo=%s"}, | |
19117 | + {Opt_ignore_silent, "nodlgt"}, | |
19118 | + {Opt_ignore_silent, "nodirperm1"}, | |
1facf9fc | 19119 | + {Opt_ignore_silent, "clean_plink"}, |
19120 | + | |
dece6358 AM |
19121 | +#ifdef CONFIG_AUFS_SHWH |
19122 | + {Opt_shwh, "shwh"}, | |
19123 | +#endif | |
19124 | + {Opt_noshwh, "noshwh"}, | |
19125 | + | |
1facf9fc | 19126 | + {Opt_rendir, "rendir=%d"}, |
19127 | + | |
19128 | + {Opt_refrof, "refrof"}, | |
19129 | + {Opt_norefrof, "norefrof"}, | |
19130 | + | |
19131 | + {Opt_verbose, "verbose"}, | |
19132 | + {Opt_verbose, "v"}, | |
19133 | + {Opt_noverbose, "noverbose"}, | |
19134 | + {Opt_noverbose, "quiet"}, | |
19135 | + {Opt_noverbose, "q"}, | |
19136 | + {Opt_noverbose, "silent"}, | |
19137 | + | |
19138 | + {Opt_sum, "sum"}, | |
19139 | + {Opt_nosum, "nosum"}, | |
19140 | + {Opt_wsum, "wsum"}, | |
19141 | + | |
19142 | + {Opt_rdcache, "rdcache=%d"}, | |
19143 | + {Opt_rdblk, "rdblk=%d"}, | |
dece6358 | 19144 | + {Opt_rdblk_def, "rdblk=def"}, |
1facf9fc | 19145 | + {Opt_rdhash, "rdhash=%d"}, |
dece6358 | 19146 | + {Opt_rdhash_def, "rdhash=def"}, |
1facf9fc | 19147 | + |
19148 | + {Opt_wbr_create, "create=%s"}, | |
19149 | + {Opt_wbr_create, "create_policy=%s"}, | |
19150 | + {Opt_wbr_copyup, "cpup=%s"}, | |
19151 | + {Opt_wbr_copyup, "copyup=%s"}, | |
19152 | + {Opt_wbr_copyup, "copyup_policy=%s"}, | |
19153 | + | |
19154 | + /* internal use for the scripts */ | |
19155 | + {Opt_ignore_silent, "si=%s"}, | |
19156 | + | |
19157 | + {Opt_br, "dirs=%s"}, | |
19158 | + {Opt_ignore, "debug=%d"}, | |
19159 | + {Opt_ignore, "delete=whiteout"}, | |
19160 | + {Opt_ignore, "delete=all"}, | |
19161 | + {Opt_ignore, "imap=%s"}, | |
19162 | + | |
1308ab2a | 19163 | + /* temporary workaround, due to old mount(8)? */ |
19164 | + {Opt_ignore_silent, "relatime"}, | |
19165 | + | |
1facf9fc | 19166 | + {Opt_err, NULL} |
19167 | +}; | |
19168 | + | |
19169 | +/* ---------------------------------------------------------------------- */ | |
19170 | + | |
19171 | +static const char *au_parser_pattern(int val, struct match_token *token) | |
19172 | +{ | |
19173 | + while (token->pattern) { | |
19174 | + if (token->token == val) | |
19175 | + return token->pattern; | |
19176 | + token++; | |
19177 | + } | |
19178 | + BUG(); | |
19179 | + return "??"; | |
19180 | +} | |
19181 | + | |
19182 | +/* ---------------------------------------------------------------------- */ | |
19183 | + | |
19184 | +static match_table_t brperms = { | |
19185 | + {AuBrPerm_RO, AUFS_BRPERM_RO}, | |
19186 | + {AuBrPerm_RR, AUFS_BRPERM_RR}, | |
19187 | + {AuBrPerm_RW, AUFS_BRPERM_RW}, | |
19188 | + | |
19189 | + {AuBrPerm_ROWH, AUFS_BRPERM_ROWH}, | |
19190 | + {AuBrPerm_RRWH, AUFS_BRPERM_RRWH}, | |
19191 | + {AuBrPerm_RWNoLinkWH, AUFS_BRPERM_RWNLWH}, | |
19192 | + | |
19193 | + {AuBrPerm_ROWH, "nfsro"}, | |
19194 | + {AuBrPerm_RO, NULL} | |
19195 | +}; | |
19196 | + | |
4a4d8108 | 19197 | +static int noinline_for_stack br_perm_val(char *perm) |
1facf9fc | 19198 | +{ |
19199 | + int val; | |
19200 | + substring_t args[MAX_OPT_ARGS]; | |
19201 | + | |
19202 | + val = match_token(perm, brperms, args); | |
19203 | + return val; | |
19204 | +} | |
19205 | + | |
19206 | +const char *au_optstr_br_perm(int brperm) | |
19207 | +{ | |
19208 | + return au_parser_pattern(brperm, (void *)brperms); | |
19209 | +} | |
19210 | + | |
19211 | +/* ---------------------------------------------------------------------- */ | |
19212 | + | |
19213 | +static match_table_t udbalevel = { | |
19214 | + {AuOpt_UDBA_REVAL, "reval"}, | |
19215 | + {AuOpt_UDBA_NONE, "none"}, | |
4a4d8108 AM |
19216 | +#ifdef CONFIG_AUFS_HNOTIFY |
19217 | + {AuOpt_UDBA_HNOTIFY, "notify"}, /* abstraction */ | |
19218 | +#ifdef CONFIG_AUFS_HFSNOTIFY | |
19219 | + {AuOpt_UDBA_HNOTIFY, "fsnotify"}, | |
4a4d8108 | 19220 | +#endif |
1facf9fc | 19221 | +#endif |
19222 | + {-1, NULL} | |
19223 | +}; | |
19224 | + | |
4a4d8108 | 19225 | +static int noinline_for_stack udba_val(char *str) |
1facf9fc | 19226 | +{ |
19227 | + substring_t args[MAX_OPT_ARGS]; | |
19228 | + | |
7f207e10 | 19229 | + return match_token(str, udbalevel, args); |
1facf9fc | 19230 | +} |
19231 | + | |
19232 | +const char *au_optstr_udba(int udba) | |
19233 | +{ | |
19234 | + return au_parser_pattern(udba, (void *)udbalevel); | |
19235 | +} | |
19236 | + | |
19237 | +/* ---------------------------------------------------------------------- */ | |
19238 | + | |
19239 | +static match_table_t au_wbr_create_policy = { | |
19240 | + {AuWbrCreate_TDP, "tdp"}, | |
19241 | + {AuWbrCreate_TDP, "top-down-parent"}, | |
19242 | + {AuWbrCreate_RR, "rr"}, | |
19243 | + {AuWbrCreate_RR, "round-robin"}, | |
19244 | + {AuWbrCreate_MFS, "mfs"}, | |
19245 | + {AuWbrCreate_MFS, "most-free-space"}, | |
19246 | + {AuWbrCreate_MFSV, "mfs:%d"}, | |
19247 | + {AuWbrCreate_MFSV, "most-free-space:%d"}, | |
19248 | + | |
19249 | + {AuWbrCreate_MFSRR, "mfsrr:%d"}, | |
19250 | + {AuWbrCreate_MFSRRV, "mfsrr:%d:%d"}, | |
19251 | + {AuWbrCreate_PMFS, "pmfs"}, | |
19252 | + {AuWbrCreate_PMFSV, "pmfs:%d"}, | |
19253 | + | |
19254 | + {-1, NULL} | |
19255 | +}; | |
19256 | + | |
dece6358 AM |
19257 | +/* |
19258 | + * cf. linux/lib/parser.c and cmdline.c | |
19259 | + * gave up calling memparse() since it uses simple_strtoull() instead of | |
19260 | + * strict_...(). | |
19261 | + */ | |
4a4d8108 AM |
19262 | +static int noinline_for_stack |
19263 | +au_match_ull(substring_t *s, unsigned long long *result) | |
1facf9fc | 19264 | +{ |
19265 | + int err; | |
19266 | + unsigned int len; | |
19267 | + char a[32]; | |
19268 | + | |
19269 | + err = -ERANGE; | |
19270 | + len = s->to - s->from; | |
19271 | + if (len + 1 <= sizeof(a)) { | |
19272 | + memcpy(a, s->from, len); | |
19273 | + a[len] = '\0'; | |
19274 | + err = strict_strtoull(a, 0, result); | |
19275 | + } | |
19276 | + return err; | |
19277 | +} | |
19278 | + | |
19279 | +static int au_wbr_mfs_wmark(substring_t *arg, char *str, | |
19280 | + struct au_opt_wbr_create *create) | |
19281 | +{ | |
19282 | + int err; | |
19283 | + unsigned long long ull; | |
19284 | + | |
19285 | + err = 0; | |
19286 | + if (!au_match_ull(arg, &ull)) | |
19287 | + create->mfsrr_watermark = ull; | |
19288 | + else { | |
4a4d8108 | 19289 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 19290 | + err = -EINVAL; |
19291 | + } | |
19292 | + | |
19293 | + return err; | |
19294 | +} | |
19295 | + | |
19296 | +static int au_wbr_mfs_sec(substring_t *arg, char *str, | |
19297 | + struct au_opt_wbr_create *create) | |
19298 | +{ | |
19299 | + int n, err; | |
19300 | + | |
19301 | + err = 0; | |
027c5e7a | 19302 | + if (!match_int(arg, &n) && 0 <= n && n <= AUFS_MFS_MAX_SEC) |
1facf9fc | 19303 | + create->mfs_second = n; |
19304 | + else { | |
4a4d8108 | 19305 | + pr_err("bad integer in %s\n", str); |
1facf9fc | 19306 | + err = -EINVAL; |
19307 | + } | |
19308 | + | |
19309 | + return err; | |
19310 | +} | |
19311 | + | |
4a4d8108 AM |
19312 | +static int noinline_for_stack |
19313 | +au_wbr_create_val(char *str, struct au_opt_wbr_create *create) | |
1facf9fc | 19314 | +{ |
19315 | + int err, e; | |
19316 | + substring_t args[MAX_OPT_ARGS]; | |
19317 | + | |
19318 | + err = match_token(str, au_wbr_create_policy, args); | |
19319 | + create->wbr_create = err; | |
19320 | + switch (err) { | |
19321 | + case AuWbrCreate_MFSRRV: | |
19322 | + e = au_wbr_mfs_wmark(&args[0], str, create); | |
19323 | + if (!e) | |
19324 | + e = au_wbr_mfs_sec(&args[1], str, create); | |
19325 | + if (unlikely(e)) | |
19326 | + err = e; | |
19327 | + break; | |
19328 | + case AuWbrCreate_MFSRR: | |
19329 | + e = au_wbr_mfs_wmark(&args[0], str, create); | |
19330 | + if (unlikely(e)) { | |
19331 | + err = e; | |
19332 | + break; | |
19333 | + } | |
19334 | + /*FALLTHROUGH*/ | |
19335 | + case AuWbrCreate_MFS: | |
19336 | + case AuWbrCreate_PMFS: | |
027c5e7a | 19337 | + create->mfs_second = AUFS_MFS_DEF_SEC; |
1facf9fc | 19338 | + break; |
19339 | + case AuWbrCreate_MFSV: | |
19340 | + case AuWbrCreate_PMFSV: | |
19341 | + e = au_wbr_mfs_sec(&args[0], str, create); | |
19342 | + if (unlikely(e)) | |
19343 | + err = e; | |
19344 | + break; | |
19345 | + } | |
19346 | + | |
19347 | + return err; | |
19348 | +} | |
19349 | + | |
19350 | +const char *au_optstr_wbr_create(int wbr_create) | |
19351 | +{ | |
19352 | + return au_parser_pattern(wbr_create, (void *)au_wbr_create_policy); | |
19353 | +} | |
19354 | + | |
19355 | +static match_table_t au_wbr_copyup_policy = { | |
19356 | + {AuWbrCopyup_TDP, "tdp"}, | |
19357 | + {AuWbrCopyup_TDP, "top-down-parent"}, | |
19358 | + {AuWbrCopyup_BUP, "bup"}, | |
19359 | + {AuWbrCopyup_BUP, "bottom-up-parent"}, | |
19360 | + {AuWbrCopyup_BU, "bu"}, | |
19361 | + {AuWbrCopyup_BU, "bottom-up"}, | |
19362 | + {-1, NULL} | |
19363 | +}; | |
19364 | + | |
4a4d8108 | 19365 | +static int noinline_for_stack au_wbr_copyup_val(char *str) |
1facf9fc | 19366 | +{ |
19367 | + substring_t args[MAX_OPT_ARGS]; | |
19368 | + | |
19369 | + return match_token(str, au_wbr_copyup_policy, args); | |
19370 | +} | |
19371 | + | |
19372 | +const char *au_optstr_wbr_copyup(int wbr_copyup) | |
19373 | +{ | |
19374 | + return au_parser_pattern(wbr_copyup, (void *)au_wbr_copyup_policy); | |
19375 | +} | |
19376 | + | |
19377 | +/* ---------------------------------------------------------------------- */ | |
19378 | + | |
19379 | +static const int lkup_dirflags = LOOKUP_FOLLOW | LOOKUP_DIRECTORY; | |
19380 | + | |
19381 | +static void dump_opts(struct au_opts *opts) | |
19382 | +{ | |
19383 | +#ifdef CONFIG_AUFS_DEBUG | |
19384 | + /* reduce stack space */ | |
19385 | + union { | |
19386 | + struct au_opt_add *add; | |
19387 | + struct au_opt_del *del; | |
19388 | + struct au_opt_mod *mod; | |
19389 | + struct au_opt_xino *xino; | |
19390 | + struct au_opt_xino_itrunc *xino_itrunc; | |
19391 | + struct au_opt_wbr_create *create; | |
19392 | + } u; | |
19393 | + struct au_opt *opt; | |
19394 | + | |
19395 | + opt = opts->opt; | |
19396 | + while (opt->type != Opt_tail) { | |
19397 | + switch (opt->type) { | |
19398 | + case Opt_add: | |
19399 | + u.add = &opt->add; | |
19400 | + AuDbg("add {b%d, %s, 0x%x, %p}\n", | |
19401 | + u.add->bindex, u.add->pathname, u.add->perm, | |
19402 | + u.add->path.dentry); | |
19403 | + break; | |
19404 | + case Opt_del: | |
19405 | + case Opt_idel: | |
19406 | + u.del = &opt->del; | |
19407 | + AuDbg("del {%s, %p}\n", | |
19408 | + u.del->pathname, u.del->h_path.dentry); | |
19409 | + break; | |
19410 | + case Opt_mod: | |
19411 | + case Opt_imod: | |
19412 | + u.mod = &opt->mod; | |
19413 | + AuDbg("mod {%s, 0x%x, %p}\n", | |
19414 | + u.mod->path, u.mod->perm, u.mod->h_root); | |
19415 | + break; | |
19416 | + case Opt_append: | |
19417 | + u.add = &opt->add; | |
19418 | + AuDbg("append {b%d, %s, 0x%x, %p}\n", | |
19419 | + u.add->bindex, u.add->pathname, u.add->perm, | |
19420 | + u.add->path.dentry); | |
19421 | + break; | |
19422 | + case Opt_prepend: | |
19423 | + u.add = &opt->add; | |
19424 | + AuDbg("prepend {b%d, %s, 0x%x, %p}\n", | |
19425 | + u.add->bindex, u.add->pathname, u.add->perm, | |
19426 | + u.add->path.dentry); | |
19427 | + break; | |
19428 | + case Opt_dirwh: | |
19429 | + AuDbg("dirwh %d\n", opt->dirwh); | |
19430 | + break; | |
19431 | + case Opt_rdcache: | |
19432 | + AuDbg("rdcache %d\n", opt->rdcache); | |
19433 | + break; | |
19434 | + case Opt_rdblk: | |
19435 | + AuDbg("rdblk %u\n", opt->rdblk); | |
19436 | + break; | |
dece6358 AM |
19437 | + case Opt_rdblk_def: |
19438 | + AuDbg("rdblk_def\n"); | |
19439 | + break; | |
1facf9fc | 19440 | + case Opt_rdhash: |
19441 | + AuDbg("rdhash %u\n", opt->rdhash); | |
19442 | + break; | |
dece6358 AM |
19443 | + case Opt_rdhash_def: |
19444 | + AuDbg("rdhash_def\n"); | |
19445 | + break; | |
1facf9fc | 19446 | + case Opt_xino: |
19447 | + u.xino = &opt->xino; | |
19448 | + AuDbg("xino {%s %.*s}\n", | |
19449 | + u.xino->path, | |
19450 | + AuDLNPair(u.xino->file->f_dentry)); | |
19451 | + break; | |
19452 | + case Opt_trunc_xino: | |
19453 | + AuLabel(trunc_xino); | |
19454 | + break; | |
19455 | + case Opt_notrunc_xino: | |
19456 | + AuLabel(notrunc_xino); | |
19457 | + break; | |
19458 | + case Opt_trunc_xino_path: | |
19459 | + case Opt_itrunc_xino: | |
19460 | + u.xino_itrunc = &opt->xino_itrunc; | |
19461 | + AuDbg("trunc_xino %d\n", u.xino_itrunc->bindex); | |
19462 | + break; | |
19463 | + | |
19464 | + case Opt_noxino: | |
19465 | + AuLabel(noxino); | |
19466 | + break; | |
19467 | + case Opt_trunc_xib: | |
19468 | + AuLabel(trunc_xib); | |
19469 | + break; | |
19470 | + case Opt_notrunc_xib: | |
19471 | + AuLabel(notrunc_xib); | |
19472 | + break; | |
dece6358 AM |
19473 | + case Opt_shwh: |
19474 | + AuLabel(shwh); | |
19475 | + break; | |
19476 | + case Opt_noshwh: | |
19477 | + AuLabel(noshwh); | |
19478 | + break; | |
1facf9fc | 19479 | + case Opt_plink: |
19480 | + AuLabel(plink); | |
19481 | + break; | |
19482 | + case Opt_noplink: | |
19483 | + AuLabel(noplink); | |
19484 | + break; | |
19485 | + case Opt_list_plink: | |
19486 | + AuLabel(list_plink); | |
19487 | + break; | |
19488 | + case Opt_udba: | |
19489 | + AuDbg("udba %d, %s\n", | |
19490 | + opt->udba, au_optstr_udba(opt->udba)); | |
19491 | + break; | |
4a4d8108 AM |
19492 | + case Opt_dio: |
19493 | + AuLabel(dio); | |
19494 | + break; | |
19495 | + case Opt_nodio: | |
19496 | + AuLabel(nodio); | |
19497 | + break; | |
1facf9fc | 19498 | + case Opt_diropq_a: |
19499 | + AuLabel(diropq_a); | |
19500 | + break; | |
19501 | + case Opt_diropq_w: | |
19502 | + AuLabel(diropq_w); | |
19503 | + break; | |
19504 | + case Opt_warn_perm: | |
19505 | + AuLabel(warn_perm); | |
19506 | + break; | |
19507 | + case Opt_nowarn_perm: | |
19508 | + AuLabel(nowarn_perm); | |
19509 | + break; | |
19510 | + case Opt_refrof: | |
19511 | + AuLabel(refrof); | |
19512 | + break; | |
19513 | + case Opt_norefrof: | |
19514 | + AuLabel(norefrof); | |
19515 | + break; | |
19516 | + case Opt_verbose: | |
19517 | + AuLabel(verbose); | |
19518 | + break; | |
19519 | + case Opt_noverbose: | |
19520 | + AuLabel(noverbose); | |
19521 | + break; | |
19522 | + case Opt_sum: | |
19523 | + AuLabel(sum); | |
19524 | + break; | |
19525 | + case Opt_nosum: | |
19526 | + AuLabel(nosum); | |
19527 | + break; | |
19528 | + case Opt_wsum: | |
19529 | + AuLabel(wsum); | |
19530 | + break; | |
19531 | + case Opt_wbr_create: | |
19532 | + u.create = &opt->wbr_create; | |
19533 | + AuDbg("create %d, %s\n", u.create->wbr_create, | |
19534 | + au_optstr_wbr_create(u.create->wbr_create)); | |
19535 | + switch (u.create->wbr_create) { | |
19536 | + case AuWbrCreate_MFSV: | |
19537 | + case AuWbrCreate_PMFSV: | |
19538 | + AuDbg("%d sec\n", u.create->mfs_second); | |
19539 | + break; | |
19540 | + case AuWbrCreate_MFSRR: | |
19541 | + AuDbg("%llu watermark\n", | |
19542 | + u.create->mfsrr_watermark); | |
19543 | + break; | |
19544 | + case AuWbrCreate_MFSRRV: | |
19545 | + AuDbg("%llu watermark, %d sec\n", | |
19546 | + u.create->mfsrr_watermark, | |
19547 | + u.create->mfs_second); | |
19548 | + break; | |
19549 | + } | |
19550 | + break; | |
19551 | + case Opt_wbr_copyup: | |
19552 | + AuDbg("copyup %d, %s\n", opt->wbr_copyup, | |
19553 | + au_optstr_wbr_copyup(opt->wbr_copyup)); | |
19554 | + break; | |
19555 | + default: | |
19556 | + BUG(); | |
19557 | + } | |
19558 | + opt++; | |
19559 | + } | |
19560 | +#endif | |
19561 | +} | |
19562 | + | |
19563 | +void au_opts_free(struct au_opts *opts) | |
19564 | +{ | |
19565 | + struct au_opt *opt; | |
19566 | + | |
19567 | + opt = opts->opt; | |
19568 | + while (opt->type != Opt_tail) { | |
19569 | + switch (opt->type) { | |
19570 | + case Opt_add: | |
19571 | + case Opt_append: | |
19572 | + case Opt_prepend: | |
19573 | + path_put(&opt->add.path); | |
19574 | + break; | |
19575 | + case Opt_del: | |
19576 | + case Opt_idel: | |
19577 | + path_put(&opt->del.h_path); | |
19578 | + break; | |
19579 | + case Opt_mod: | |
19580 | + case Opt_imod: | |
19581 | + dput(opt->mod.h_root); | |
19582 | + break; | |
19583 | + case Opt_xino: | |
19584 | + fput(opt->xino.file); | |
19585 | + break; | |
19586 | + } | |
19587 | + opt++; | |
19588 | + } | |
19589 | +} | |
19590 | + | |
19591 | +static int opt_add(struct au_opt *opt, char *opt_str, unsigned long sb_flags, | |
19592 | + aufs_bindex_t bindex) | |
19593 | +{ | |
19594 | + int err; | |
19595 | + struct au_opt_add *add = &opt->add; | |
19596 | + char *p; | |
19597 | + | |
19598 | + add->bindex = bindex; | |
19599 | + add->perm = AuBrPerm_Last; | |
19600 | + add->pathname = opt_str; | |
19601 | + p = strchr(opt_str, '='); | |
19602 | + if (p) { | |
19603 | + *p++ = 0; | |
19604 | + if (*p) | |
19605 | + add->perm = br_perm_val(p); | |
19606 | + } | |
19607 | + | |
19608 | + err = vfsub_kern_path(add->pathname, lkup_dirflags, &add->path); | |
19609 | + if (!err) { | |
19610 | + if (!p) { | |
19611 | + add->perm = AuBrPerm_RO; | |
19612 | + if (au_test_fs_rr(add->path.dentry->d_sb)) | |
19613 | + add->perm = AuBrPerm_RR; | |
19614 | + else if (!bindex && !(sb_flags & MS_RDONLY)) | |
19615 | + add->perm = AuBrPerm_RW; | |
19616 | + } | |
19617 | + opt->type = Opt_add; | |
19618 | + goto out; | |
19619 | + } | |
4a4d8108 | 19620 | + pr_err("lookup failed %s (%d)\n", add->pathname, err); |
1facf9fc | 19621 | + err = -EINVAL; |
19622 | + | |
4f0767ce | 19623 | +out: |
1facf9fc | 19624 | + return err; |
19625 | +} | |
19626 | + | |
19627 | +static int au_opts_parse_del(struct au_opt_del *del, substring_t args[]) | |
19628 | +{ | |
19629 | + int err; | |
19630 | + | |
19631 | + del->pathname = args[0].from; | |
19632 | + AuDbg("del path %s\n", del->pathname); | |
19633 | + | |
19634 | + err = vfsub_kern_path(del->pathname, lkup_dirflags, &del->h_path); | |
19635 | + if (unlikely(err)) | |
4a4d8108 | 19636 | + pr_err("lookup failed %s (%d)\n", del->pathname, err); |
1facf9fc | 19637 | + |
19638 | + return err; | |
19639 | +} | |
19640 | + | |
19641 | +#if 0 /* reserved for future use */ | |
19642 | +static int au_opts_parse_idel(struct super_block *sb, aufs_bindex_t bindex, | |
19643 | + struct au_opt_del *del, substring_t args[]) | |
19644 | +{ | |
19645 | + int err; | |
19646 | + struct dentry *root; | |
19647 | + | |
19648 | + err = -EINVAL; | |
19649 | + root = sb->s_root; | |
19650 | + aufs_read_lock(root, AuLock_FLUSH); | |
19651 | + if (bindex < 0 || au_sbend(sb) < bindex) { | |
4a4d8108 | 19652 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 19653 | + goto out; |
19654 | + } | |
19655 | + | |
19656 | + err = 0; | |
19657 | + del->h_path.dentry = dget(au_h_dptr(root, bindex)); | |
19658 | + del->h_path.mnt = mntget(au_sbr_mnt(sb, bindex)); | |
19659 | + | |
4f0767ce | 19660 | +out: |
1facf9fc | 19661 | + aufs_read_unlock(root, !AuLock_IR); |
19662 | + return err; | |
19663 | +} | |
19664 | +#endif | |
19665 | + | |
4a4d8108 AM |
19666 | +static int noinline_for_stack |
19667 | +au_opts_parse_mod(struct au_opt_mod *mod, substring_t args[]) | |
1facf9fc | 19668 | +{ |
19669 | + int err; | |
19670 | + struct path path; | |
19671 | + char *p; | |
19672 | + | |
19673 | + err = -EINVAL; | |
19674 | + mod->path = args[0].from; | |
19675 | + p = strchr(mod->path, '='); | |
19676 | + if (unlikely(!p)) { | |
4a4d8108 | 19677 | + pr_err("no permssion %s\n", args[0].from); |
1facf9fc | 19678 | + goto out; |
19679 | + } | |
19680 | + | |
19681 | + *p++ = 0; | |
19682 | + err = vfsub_kern_path(mod->path, lkup_dirflags, &path); | |
19683 | + if (unlikely(err)) { | |
4a4d8108 | 19684 | + pr_err("lookup failed %s (%d)\n", mod->path, err); |
1facf9fc | 19685 | + goto out; |
19686 | + } | |
19687 | + | |
19688 | + mod->perm = br_perm_val(p); | |
19689 | + AuDbg("mod path %s, perm 0x%x, %s\n", mod->path, mod->perm, p); | |
19690 | + mod->h_root = dget(path.dentry); | |
19691 | + path_put(&path); | |
19692 | + | |
4f0767ce | 19693 | +out: |
1facf9fc | 19694 | + return err; |
19695 | +} | |
19696 | + | |
19697 | +#if 0 /* reserved for future use */ | |
19698 | +static int au_opts_parse_imod(struct super_block *sb, aufs_bindex_t bindex, | |
19699 | + struct au_opt_mod *mod, substring_t args[]) | |
19700 | +{ | |
19701 | + int err; | |
19702 | + struct dentry *root; | |
19703 | + | |
19704 | + err = -EINVAL; | |
19705 | + root = sb->s_root; | |
19706 | + aufs_read_lock(root, AuLock_FLUSH); | |
19707 | + if (bindex < 0 || au_sbend(sb) < bindex) { | |
4a4d8108 | 19708 | + pr_err("out of bounds, %d\n", bindex); |
1facf9fc | 19709 | + goto out; |
19710 | + } | |
19711 | + | |
19712 | + err = 0; | |
19713 | + mod->perm = br_perm_val(args[1].from); | |
19714 | + AuDbg("mod path %s, perm 0x%x, %s\n", | |
19715 | + mod->path, mod->perm, args[1].from); | |
19716 | + mod->h_root = dget(au_h_dptr(root, bindex)); | |
19717 | + | |
4f0767ce | 19718 | +out: |
1facf9fc | 19719 | + aufs_read_unlock(root, !AuLock_IR); |
19720 | + return err; | |
19721 | +} | |
19722 | +#endif | |
19723 | + | |
19724 | +static int au_opts_parse_xino(struct super_block *sb, struct au_opt_xino *xino, | |
19725 | + substring_t args[]) | |
19726 | +{ | |
19727 | + int err; | |
19728 | + struct file *file; | |
19729 | + | |
19730 | + file = au_xino_create(sb, args[0].from, /*silent*/0); | |
19731 | + err = PTR_ERR(file); | |
19732 | + if (IS_ERR(file)) | |
19733 | + goto out; | |
19734 | + | |
19735 | + err = -EINVAL; | |
19736 | + if (unlikely(file->f_dentry->d_sb == sb)) { | |
19737 | + fput(file); | |
4a4d8108 | 19738 | + pr_err("%s must be outside\n", args[0].from); |
1facf9fc | 19739 | + goto out; |
19740 | + } | |
19741 | + | |
19742 | + err = 0; | |
19743 | + xino->file = file; | |
19744 | + xino->path = args[0].from; | |
19745 | + | |
4f0767ce | 19746 | +out: |
1facf9fc | 19747 | + return err; |
19748 | +} | |
19749 | + | |
4a4d8108 AM |
19750 | +static int noinline_for_stack |
19751 | +au_opts_parse_xino_itrunc_path(struct super_block *sb, | |
19752 | + struct au_opt_xino_itrunc *xino_itrunc, | |
19753 | + substring_t args[]) | |
1facf9fc | 19754 | +{ |
19755 | + int err; | |
19756 | + aufs_bindex_t bend, bindex; | |
19757 | + struct path path; | |
19758 | + struct dentry *root; | |
19759 | + | |
19760 | + err = vfsub_kern_path(args[0].from, lkup_dirflags, &path); | |
19761 | + if (unlikely(err)) { | |
4a4d8108 | 19762 | + pr_err("lookup failed %s (%d)\n", args[0].from, err); |
1facf9fc | 19763 | + goto out; |
19764 | + } | |
19765 | + | |
19766 | + xino_itrunc->bindex = -1; | |
19767 | + root = sb->s_root; | |
19768 | + aufs_read_lock(root, AuLock_FLUSH); | |
19769 | + bend = au_sbend(sb); | |
19770 | + for (bindex = 0; bindex <= bend; bindex++) { | |
19771 | + if (au_h_dptr(root, bindex) == path.dentry) { | |
19772 | + xino_itrunc->bindex = bindex; | |
19773 | + break; | |
19774 | + } | |
19775 | + } | |
19776 | + aufs_read_unlock(root, !AuLock_IR); | |
19777 | + path_put(&path); | |
19778 | + | |
19779 | + if (unlikely(xino_itrunc->bindex < 0)) { | |
4a4d8108 | 19780 | + pr_err("no such branch %s\n", args[0].from); |
1facf9fc | 19781 | + err = -EINVAL; |
19782 | + } | |
19783 | + | |
4f0767ce | 19784 | +out: |
1facf9fc | 19785 | + return err; |
19786 | +} | |
19787 | + | |
19788 | +/* called without aufs lock */ | |
19789 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts) | |
19790 | +{ | |
19791 | + int err, n, token; | |
19792 | + aufs_bindex_t bindex; | |
19793 | + unsigned char skipped; | |
19794 | + struct dentry *root; | |
19795 | + struct au_opt *opt, *opt_tail; | |
19796 | + char *opt_str; | |
19797 | + /* reduce the stack space */ | |
19798 | + union { | |
19799 | + struct au_opt_xino_itrunc *xino_itrunc; | |
19800 | + struct au_opt_wbr_create *create; | |
19801 | + } u; | |
19802 | + struct { | |
19803 | + substring_t args[MAX_OPT_ARGS]; | |
19804 | + } *a; | |
19805 | + | |
19806 | + err = -ENOMEM; | |
19807 | + a = kmalloc(sizeof(*a), GFP_NOFS); | |
19808 | + if (unlikely(!a)) | |
19809 | + goto out; | |
19810 | + | |
19811 | + root = sb->s_root; | |
19812 | + err = 0; | |
19813 | + bindex = 0; | |
19814 | + opt = opts->opt; | |
19815 | + opt_tail = opt + opts->max_opt - 1; | |
19816 | + opt->type = Opt_tail; | |
19817 | + while (!err && (opt_str = strsep(&str, ",")) && *opt_str) { | |
19818 | + err = -EINVAL; | |
19819 | + skipped = 0; | |
19820 | + token = match_token(opt_str, options, a->args); | |
19821 | + switch (token) { | |
19822 | + case Opt_br: | |
19823 | + err = 0; | |
19824 | + while (!err && (opt_str = strsep(&a->args[0].from, ":")) | |
19825 | + && *opt_str) { | |
19826 | + err = opt_add(opt, opt_str, opts->sb_flags, | |
19827 | + bindex++); | |
19828 | + if (unlikely(!err && ++opt > opt_tail)) { | |
19829 | + err = -E2BIG; | |
19830 | + break; | |
19831 | + } | |
19832 | + opt->type = Opt_tail; | |
19833 | + skipped = 1; | |
19834 | + } | |
19835 | + break; | |
19836 | + case Opt_add: | |
19837 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 19838 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19839 | + break; |
19840 | + } | |
19841 | + bindex = n; | |
19842 | + err = opt_add(opt, a->args[1].from, opts->sb_flags, | |
19843 | + bindex); | |
19844 | + if (!err) | |
19845 | + opt->type = token; | |
19846 | + break; | |
19847 | + case Opt_append: | |
19848 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
19849 | + /*dummy bindex*/1); | |
19850 | + if (!err) | |
19851 | + opt->type = token; | |
19852 | + break; | |
19853 | + case Opt_prepend: | |
19854 | + err = opt_add(opt, a->args[0].from, opts->sb_flags, | |
19855 | + /*bindex*/0); | |
19856 | + if (!err) | |
19857 | + opt->type = token; | |
19858 | + break; | |
19859 | + case Opt_del: | |
19860 | + err = au_opts_parse_del(&opt->del, a->args); | |
19861 | + if (!err) | |
19862 | + opt->type = token; | |
19863 | + break; | |
19864 | +#if 0 /* reserved for future use */ | |
19865 | + case Opt_idel: | |
19866 | + del->pathname = "(indexed)"; | |
19867 | + if (unlikely(match_int(&args[0], &n))) { | |
4a4d8108 | 19868 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19869 | + break; |
19870 | + } | |
19871 | + err = au_opts_parse_idel(sb, n, &opt->del, a->args); | |
19872 | + if (!err) | |
19873 | + opt->type = token; | |
19874 | + break; | |
19875 | +#endif | |
19876 | + case Opt_mod: | |
19877 | + err = au_opts_parse_mod(&opt->mod, a->args); | |
19878 | + if (!err) | |
19879 | + opt->type = token; | |
19880 | + break; | |
19881 | +#ifdef IMOD /* reserved for future use */ | |
19882 | + case Opt_imod: | |
19883 | + u.mod->path = "(indexed)"; | |
19884 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 19885 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19886 | + break; |
19887 | + } | |
19888 | + err = au_opts_parse_imod(sb, n, &opt->mod, a->args); | |
19889 | + if (!err) | |
19890 | + opt->type = token; | |
19891 | + break; | |
19892 | +#endif | |
19893 | + case Opt_xino: | |
19894 | + err = au_opts_parse_xino(sb, &opt->xino, a->args); | |
19895 | + if (!err) | |
19896 | + opt->type = token; | |
19897 | + break; | |
19898 | + | |
19899 | + case Opt_trunc_xino_path: | |
19900 | + err = au_opts_parse_xino_itrunc_path | |
19901 | + (sb, &opt->xino_itrunc, a->args); | |
19902 | + if (!err) | |
19903 | + opt->type = token; | |
19904 | + break; | |
19905 | + | |
19906 | + case Opt_itrunc_xino: | |
19907 | + u.xino_itrunc = &opt->xino_itrunc; | |
19908 | + if (unlikely(match_int(&a->args[0], &n))) { | |
4a4d8108 | 19909 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19910 | + break; |
19911 | + } | |
19912 | + u.xino_itrunc->bindex = n; | |
19913 | + aufs_read_lock(root, AuLock_FLUSH); | |
19914 | + if (n < 0 || au_sbend(sb) < n) { | |
4a4d8108 | 19915 | + pr_err("out of bounds, %d\n", n); |
1facf9fc | 19916 | + aufs_read_unlock(root, !AuLock_IR); |
19917 | + break; | |
19918 | + } | |
19919 | + aufs_read_unlock(root, !AuLock_IR); | |
19920 | + err = 0; | |
19921 | + opt->type = token; | |
19922 | + break; | |
19923 | + | |
19924 | + case Opt_dirwh: | |
19925 | + if (unlikely(match_int(&a->args[0], &opt->dirwh))) | |
19926 | + break; | |
19927 | + err = 0; | |
19928 | + opt->type = token; | |
19929 | + break; | |
19930 | + | |
19931 | + case Opt_rdcache: | |
027c5e7a AM |
19932 | + if (unlikely(match_int(&a->args[0], &n))) { |
19933 | + pr_err("bad integer in %s\n", opt_str); | |
1facf9fc | 19934 | + break; |
027c5e7a AM |
19935 | + } |
19936 | + if (unlikely(n > AUFS_RDCACHE_MAX)) { | |
19937 | + pr_err("rdcache must be smaller than %d\n", | |
19938 | + AUFS_RDCACHE_MAX); | |
19939 | + break; | |
19940 | + } | |
19941 | + opt->rdcache = n; | |
1facf9fc | 19942 | + err = 0; |
19943 | + opt->type = token; | |
19944 | + break; | |
19945 | + case Opt_rdblk: | |
19946 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 19947 | + || n < 0 |
1facf9fc | 19948 | + || n > KMALLOC_MAX_SIZE)) { |
4a4d8108 | 19949 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19950 | + break; |
19951 | + } | |
1308ab2a | 19952 | + if (unlikely(n && n < NAME_MAX)) { |
4a4d8108 AM |
19953 | + pr_err("rdblk must be larger than %d\n", |
19954 | + NAME_MAX); | |
1facf9fc | 19955 | + break; |
19956 | + } | |
19957 | + opt->rdblk = n; | |
19958 | + err = 0; | |
19959 | + opt->type = token; | |
19960 | + break; | |
19961 | + case Opt_rdhash: | |
19962 | + if (unlikely(match_int(&a->args[0], &n) | |
1308ab2a | 19963 | + || n < 0 |
1facf9fc | 19964 | + || n * sizeof(struct hlist_head) |
19965 | + > KMALLOC_MAX_SIZE)) { | |
4a4d8108 | 19966 | + pr_err("bad integer in %s\n", opt_str); |
1facf9fc | 19967 | + break; |
19968 | + } | |
19969 | + opt->rdhash = n; | |
19970 | + err = 0; | |
19971 | + opt->type = token; | |
19972 | + break; | |
19973 | + | |
19974 | + case Opt_trunc_xino: | |
19975 | + case Opt_notrunc_xino: | |
19976 | + case Opt_noxino: | |
19977 | + case Opt_trunc_xib: | |
19978 | + case Opt_notrunc_xib: | |
dece6358 AM |
19979 | + case Opt_shwh: |
19980 | + case Opt_noshwh: | |
1facf9fc | 19981 | + case Opt_plink: |
19982 | + case Opt_noplink: | |
19983 | + case Opt_list_plink: | |
4a4d8108 AM |
19984 | + case Opt_dio: |
19985 | + case Opt_nodio: | |
1facf9fc | 19986 | + case Opt_diropq_a: |
19987 | + case Opt_diropq_w: | |
19988 | + case Opt_warn_perm: | |
19989 | + case Opt_nowarn_perm: | |
19990 | + case Opt_refrof: | |
19991 | + case Opt_norefrof: | |
19992 | + case Opt_verbose: | |
19993 | + case Opt_noverbose: | |
19994 | + case Opt_sum: | |
19995 | + case Opt_nosum: | |
19996 | + case Opt_wsum: | |
dece6358 AM |
19997 | + case Opt_rdblk_def: |
19998 | + case Opt_rdhash_def: | |
1facf9fc | 19999 | + err = 0; |
20000 | + opt->type = token; | |
20001 | + break; | |
20002 | + | |
20003 | + case Opt_udba: | |
20004 | + opt->udba = udba_val(a->args[0].from); | |
20005 | + if (opt->udba >= 0) { | |
20006 | + err = 0; | |
20007 | + opt->type = token; | |
20008 | + } else | |
4a4d8108 | 20009 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 20010 | + break; |
20011 | + | |
20012 | + case Opt_wbr_create: | |
20013 | + u.create = &opt->wbr_create; | |
20014 | + u.create->wbr_create | |
20015 | + = au_wbr_create_val(a->args[0].from, u.create); | |
20016 | + if (u.create->wbr_create >= 0) { | |
20017 | + err = 0; | |
20018 | + opt->type = token; | |
20019 | + } else | |
4a4d8108 | 20020 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 20021 | + break; |
20022 | + case Opt_wbr_copyup: | |
20023 | + opt->wbr_copyup = au_wbr_copyup_val(a->args[0].from); | |
20024 | + if (opt->wbr_copyup >= 0) { | |
20025 | + err = 0; | |
20026 | + opt->type = token; | |
20027 | + } else | |
4a4d8108 | 20028 | + pr_err("wrong value, %s\n", opt_str); |
1facf9fc | 20029 | + break; |
20030 | + | |
20031 | + case Opt_ignore: | |
4a4d8108 | 20032 | + pr_warning("ignored %s\n", opt_str); |
1facf9fc | 20033 | + /*FALLTHROUGH*/ |
20034 | + case Opt_ignore_silent: | |
20035 | + skipped = 1; | |
20036 | + err = 0; | |
20037 | + break; | |
20038 | + case Opt_err: | |
4a4d8108 | 20039 | + pr_err("unknown option %s\n", opt_str); |
1facf9fc | 20040 | + break; |
20041 | + } | |
20042 | + | |
20043 | + if (!err && !skipped) { | |
20044 | + if (unlikely(++opt > opt_tail)) { | |
20045 | + err = -E2BIG; | |
20046 | + opt--; | |
20047 | + opt->type = Opt_tail; | |
20048 | + break; | |
20049 | + } | |
20050 | + opt->type = Opt_tail; | |
20051 | + } | |
20052 | + } | |
20053 | + | |
20054 | + kfree(a); | |
20055 | + dump_opts(opts); | |
20056 | + if (unlikely(err)) | |
20057 | + au_opts_free(opts); | |
20058 | + | |
4f0767ce | 20059 | +out: |
1facf9fc | 20060 | + return err; |
20061 | +} | |
20062 | + | |
20063 | +static int au_opt_wbr_create(struct super_block *sb, | |
20064 | + struct au_opt_wbr_create *create) | |
20065 | +{ | |
20066 | + int err; | |
20067 | + struct au_sbinfo *sbinfo; | |
20068 | + | |
dece6358 AM |
20069 | + SiMustWriteLock(sb); |
20070 | + | |
1facf9fc | 20071 | + err = 1; /* handled */ |
20072 | + sbinfo = au_sbi(sb); | |
20073 | + if (sbinfo->si_wbr_create_ops->fin) { | |
20074 | + err = sbinfo->si_wbr_create_ops->fin(sb); | |
20075 | + if (!err) | |
20076 | + err = 1; | |
20077 | + } | |
20078 | + | |
20079 | + sbinfo->si_wbr_create = create->wbr_create; | |
20080 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + create->wbr_create; | |
20081 | + switch (create->wbr_create) { | |
20082 | + case AuWbrCreate_MFSRRV: | |
20083 | + case AuWbrCreate_MFSRR: | |
20084 | + sbinfo->si_wbr_mfs.mfsrr_watermark = create->mfsrr_watermark; | |
20085 | + /*FALLTHROUGH*/ | |
20086 | + case AuWbrCreate_MFS: | |
20087 | + case AuWbrCreate_MFSV: | |
20088 | + case AuWbrCreate_PMFS: | |
20089 | + case AuWbrCreate_PMFSV: | |
e49829fe JR |
20090 | + sbinfo->si_wbr_mfs.mfs_expire |
20091 | + = msecs_to_jiffies(create->mfs_second * MSEC_PER_SEC); | |
1facf9fc | 20092 | + break; |
20093 | + } | |
20094 | + | |
20095 | + if (sbinfo->si_wbr_create_ops->init) | |
20096 | + sbinfo->si_wbr_create_ops->init(sb); /* ignore */ | |
20097 | + | |
20098 | + return err; | |
20099 | +} | |
20100 | + | |
20101 | +/* | |
20102 | + * returns, | |
20103 | + * plus: processed without an error | |
20104 | + * zero: unprocessed | |
20105 | + */ | |
20106 | +static int au_opt_simple(struct super_block *sb, struct au_opt *opt, | |
20107 | + struct au_opts *opts) | |
20108 | +{ | |
20109 | + int err; | |
20110 | + struct au_sbinfo *sbinfo; | |
20111 | + | |
dece6358 AM |
20112 | + SiMustWriteLock(sb); |
20113 | + | |
1facf9fc | 20114 | + err = 1; /* handled */ |
20115 | + sbinfo = au_sbi(sb); | |
20116 | + switch (opt->type) { | |
20117 | + case Opt_udba: | |
20118 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; | |
20119 | + sbinfo->si_mntflags |= opt->udba; | |
20120 | + opts->given_udba |= opt->udba; | |
20121 | + break; | |
20122 | + | |
20123 | + case Opt_plink: | |
20124 | + au_opt_set(sbinfo->si_mntflags, PLINK); | |
20125 | + break; | |
20126 | + case Opt_noplink: | |
20127 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
e49829fe | 20128 | + au_plink_put(sb, /*verbose*/1); |
1facf9fc | 20129 | + au_opt_clr(sbinfo->si_mntflags, PLINK); |
20130 | + break; | |
20131 | + case Opt_list_plink: | |
20132 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
20133 | + au_plink_list(sb); | |
20134 | + break; | |
20135 | + | |
4a4d8108 AM |
20136 | + case Opt_dio: |
20137 | + au_opt_set(sbinfo->si_mntflags, DIO); | |
20138 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
20139 | + break; | |
20140 | + case Opt_nodio: | |
20141 | + au_opt_clr(sbinfo->si_mntflags, DIO); | |
20142 | + au_fset_opts(opts->flags, REFRESH_DYAOP); | |
20143 | + break; | |
20144 | + | |
1facf9fc | 20145 | + case Opt_diropq_a: |
20146 | + au_opt_set(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
20147 | + break; | |
20148 | + case Opt_diropq_w: | |
20149 | + au_opt_clr(sbinfo->si_mntflags, ALWAYS_DIROPQ); | |
20150 | + break; | |
20151 | + | |
20152 | + case Opt_warn_perm: | |
20153 | + au_opt_set(sbinfo->si_mntflags, WARN_PERM); | |
20154 | + break; | |
20155 | + case Opt_nowarn_perm: | |
20156 | + au_opt_clr(sbinfo->si_mntflags, WARN_PERM); | |
20157 | + break; | |
20158 | + | |
20159 | + case Opt_refrof: | |
20160 | + au_opt_set(sbinfo->si_mntflags, REFROF); | |
20161 | + break; | |
20162 | + case Opt_norefrof: | |
20163 | + au_opt_clr(sbinfo->si_mntflags, REFROF); | |
20164 | + break; | |
20165 | + | |
20166 | + case Opt_verbose: | |
20167 | + au_opt_set(sbinfo->si_mntflags, VERBOSE); | |
20168 | + break; | |
20169 | + case Opt_noverbose: | |
20170 | + au_opt_clr(sbinfo->si_mntflags, VERBOSE); | |
20171 | + break; | |
20172 | + | |
20173 | + case Opt_sum: | |
20174 | + au_opt_set(sbinfo->si_mntflags, SUM); | |
20175 | + break; | |
20176 | + case Opt_wsum: | |
20177 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
20178 | + au_opt_set(sbinfo->si_mntflags, SUM_W); | |
20179 | + case Opt_nosum: | |
20180 | + au_opt_clr(sbinfo->si_mntflags, SUM); | |
20181 | + au_opt_clr(sbinfo->si_mntflags, SUM_W); | |
20182 | + break; | |
20183 | + | |
20184 | + case Opt_wbr_create: | |
20185 | + err = au_opt_wbr_create(sb, &opt->wbr_create); | |
20186 | + break; | |
20187 | + case Opt_wbr_copyup: | |
20188 | + sbinfo->si_wbr_copyup = opt->wbr_copyup; | |
20189 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + opt->wbr_copyup; | |
20190 | + break; | |
20191 | + | |
20192 | + case Opt_dirwh: | |
20193 | + sbinfo->si_dirwh = opt->dirwh; | |
20194 | + break; | |
20195 | + | |
20196 | + case Opt_rdcache: | |
e49829fe JR |
20197 | + sbinfo->si_rdcache |
20198 | + = msecs_to_jiffies(opt->rdcache * MSEC_PER_SEC); | |
1facf9fc | 20199 | + break; |
20200 | + case Opt_rdblk: | |
20201 | + sbinfo->si_rdblk = opt->rdblk; | |
20202 | + break; | |
dece6358 AM |
20203 | + case Opt_rdblk_def: |
20204 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; | |
20205 | + break; | |
1facf9fc | 20206 | + case Opt_rdhash: |
20207 | + sbinfo->si_rdhash = opt->rdhash; | |
20208 | + break; | |
dece6358 AM |
20209 | + case Opt_rdhash_def: |
20210 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
20211 | + break; | |
20212 | + | |
20213 | + case Opt_shwh: | |
20214 | + au_opt_set(sbinfo->si_mntflags, SHWH); | |
20215 | + break; | |
20216 | + case Opt_noshwh: | |
20217 | + au_opt_clr(sbinfo->si_mntflags, SHWH); | |
20218 | + break; | |
1facf9fc | 20219 | + |
20220 | + case Opt_trunc_xino: | |
20221 | + au_opt_set(sbinfo->si_mntflags, TRUNC_XINO); | |
20222 | + break; | |
20223 | + case Opt_notrunc_xino: | |
20224 | + au_opt_clr(sbinfo->si_mntflags, TRUNC_XINO); | |
20225 | + break; | |
20226 | + | |
20227 | + case Opt_trunc_xino_path: | |
20228 | + case Opt_itrunc_xino: | |
20229 | + err = au_xino_trunc(sb, opt->xino_itrunc.bindex); | |
20230 | + if (!err) | |
20231 | + err = 1; | |
20232 | + break; | |
20233 | + | |
20234 | + case Opt_trunc_xib: | |
20235 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
20236 | + break; | |
20237 | + case Opt_notrunc_xib: | |
20238 | + au_fclr_opts(opts->flags, TRUNC_XIB); | |
20239 | + break; | |
20240 | + | |
20241 | + default: | |
20242 | + err = 0; | |
20243 | + break; | |
20244 | + } | |
20245 | + | |
20246 | + return err; | |
20247 | +} | |
20248 | + | |
20249 | +/* | |
20250 | + * returns tri-state. | |
20251 | + * plus: processed without an error | |
20252 | + * zero: unprocessed | |
20253 | + * minus: error | |
20254 | + */ | |
20255 | +static int au_opt_br(struct super_block *sb, struct au_opt *opt, | |
20256 | + struct au_opts *opts) | |
20257 | +{ | |
20258 | + int err, do_refresh; | |
20259 | + | |
20260 | + err = 0; | |
20261 | + switch (opt->type) { | |
20262 | + case Opt_append: | |
20263 | + opt->add.bindex = au_sbend(sb) + 1; | |
20264 | + if (opt->add.bindex < 0) | |
20265 | + opt->add.bindex = 0; | |
20266 | + goto add; | |
20267 | + case Opt_prepend: | |
20268 | + opt->add.bindex = 0; | |
20269 | + add: | |
20270 | + case Opt_add: | |
20271 | + err = au_br_add(sb, &opt->add, | |
20272 | + au_ftest_opts(opts->flags, REMOUNT)); | |
20273 | + if (!err) { | |
20274 | + err = 1; | |
027c5e7a | 20275 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 20276 | + } |
20277 | + break; | |
20278 | + | |
20279 | + case Opt_del: | |
20280 | + case Opt_idel: | |
20281 | + err = au_br_del(sb, &opt->del, | |
20282 | + au_ftest_opts(opts->flags, REMOUNT)); | |
20283 | + if (!err) { | |
20284 | + err = 1; | |
20285 | + au_fset_opts(opts->flags, TRUNC_XIB); | |
027c5e7a | 20286 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 20287 | + } |
20288 | + break; | |
20289 | + | |
20290 | + case Opt_mod: | |
20291 | + case Opt_imod: | |
20292 | + err = au_br_mod(sb, &opt->mod, | |
20293 | + au_ftest_opts(opts->flags, REMOUNT), | |
20294 | + &do_refresh); | |
20295 | + if (!err) { | |
20296 | + err = 1; | |
027c5e7a AM |
20297 | + if (do_refresh) |
20298 | + au_fset_opts(opts->flags, REFRESH); | |
1facf9fc | 20299 | + } |
20300 | + break; | |
20301 | + } | |
20302 | + | |
20303 | + return err; | |
20304 | +} | |
20305 | + | |
20306 | +static int au_opt_xino(struct super_block *sb, struct au_opt *opt, | |
20307 | + struct au_opt_xino **opt_xino, | |
20308 | + struct au_opts *opts) | |
20309 | +{ | |
20310 | + int err; | |
20311 | + aufs_bindex_t bend, bindex; | |
20312 | + struct dentry *root, *parent, *h_root; | |
20313 | + | |
20314 | + err = 0; | |
20315 | + switch (opt->type) { | |
20316 | + case Opt_xino: | |
20317 | + err = au_xino_set(sb, &opt->xino, | |
20318 | + !!au_ftest_opts(opts->flags, REMOUNT)); | |
20319 | + if (unlikely(err)) | |
20320 | + break; | |
20321 | + | |
20322 | + *opt_xino = &opt->xino; | |
20323 | + au_xino_brid_set(sb, -1); | |
20324 | + | |
20325 | + /* safe d_parent access */ | |
20326 | + parent = opt->xino.file->f_dentry->d_parent; | |
20327 | + root = sb->s_root; | |
20328 | + bend = au_sbend(sb); | |
20329 | + for (bindex = 0; bindex <= bend; bindex++) { | |
20330 | + h_root = au_h_dptr(root, bindex); | |
20331 | + if (h_root == parent) { | |
20332 | + au_xino_brid_set(sb, au_sbr_id(sb, bindex)); | |
20333 | + break; | |
20334 | + } | |
20335 | + } | |
20336 | + break; | |
20337 | + | |
20338 | + case Opt_noxino: | |
20339 | + au_xino_clr(sb); | |
20340 | + au_xino_brid_set(sb, -1); | |
20341 | + *opt_xino = (void *)-1; | |
20342 | + break; | |
20343 | + } | |
20344 | + | |
20345 | + return err; | |
20346 | +} | |
20347 | + | |
20348 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
20349 | + unsigned int pending) | |
20350 | +{ | |
20351 | + int err; | |
20352 | + aufs_bindex_t bindex, bend; | |
20353 | + unsigned char do_plink, skip, do_free; | |
20354 | + struct au_branch *br; | |
20355 | + struct au_wbr *wbr; | |
20356 | + struct dentry *root; | |
20357 | + struct inode *dir, *h_dir; | |
20358 | + struct au_sbinfo *sbinfo; | |
20359 | + struct au_hinode *hdir; | |
20360 | + | |
dece6358 AM |
20361 | + SiMustAnyLock(sb); |
20362 | + | |
1facf9fc | 20363 | + sbinfo = au_sbi(sb); |
20364 | + AuDebugOn(!(sbinfo->si_mntflags & AuOptMask_UDBA)); | |
20365 | + | |
dece6358 AM |
20366 | + if (!(sb_flags & MS_RDONLY)) { |
20367 | + if (unlikely(!au_br_writable(au_sbr_perm(sb, 0)))) | |
4a4d8108 | 20368 | + pr_warning("first branch should be rw\n"); |
dece6358 | 20369 | + if (unlikely(au_opt_test(sbinfo->si_mntflags, SHWH))) |
4a4d8108 | 20370 | + pr_warning("shwh should be used with ro\n"); |
dece6358 | 20371 | + } |
1facf9fc | 20372 | + |
4a4d8108 | 20373 | + if (au_opt_test((sbinfo->si_mntflags | pending), UDBA_HNOTIFY) |
1facf9fc | 20374 | + && !au_opt_test(sbinfo->si_mntflags, XINO)) |
4a4d8108 | 20375 | + pr_warning("udba=*notify requires xino\n"); |
1facf9fc | 20376 | + |
20377 | + err = 0; | |
20378 | + root = sb->s_root; | |
4a4d8108 | 20379 | + dir = root->d_inode; |
1facf9fc | 20380 | + do_plink = !!au_opt_test(sbinfo->si_mntflags, PLINK); |
20381 | + bend = au_sbend(sb); | |
20382 | + for (bindex = 0; !err && bindex <= bend; bindex++) { | |
20383 | + skip = 0; | |
20384 | + h_dir = au_h_iptr(dir, bindex); | |
20385 | + br = au_sbr(sb, bindex); | |
20386 | + do_free = 0; | |
20387 | + | |
20388 | + wbr = br->br_wbr; | |
20389 | + if (wbr) | |
20390 | + wbr_wh_read_lock(wbr); | |
20391 | + | |
20392 | + switch (br->br_perm) { | |
20393 | + case AuBrPerm_RO: | |
20394 | + case AuBrPerm_ROWH: | |
20395 | + case AuBrPerm_RR: | |
20396 | + case AuBrPerm_RRWH: | |
20397 | + do_free = !!wbr; | |
20398 | + skip = (!wbr | |
20399 | + || (!wbr->wbr_whbase | |
20400 | + && !wbr->wbr_plink | |
20401 | + && !wbr->wbr_orph)); | |
20402 | + break; | |
20403 | + | |
20404 | + case AuBrPerm_RWNoLinkWH: | |
20405 | + /* skip = (!br->br_whbase && !br->br_orph); */ | |
20406 | + skip = (!wbr || !wbr->wbr_whbase); | |
20407 | + if (skip && wbr) { | |
20408 | + if (do_plink) | |
20409 | + skip = !!wbr->wbr_plink; | |
20410 | + else | |
20411 | + skip = !wbr->wbr_plink; | |
20412 | + } | |
20413 | + break; | |
20414 | + | |
20415 | + case AuBrPerm_RW: | |
20416 | + /* skip = (br->br_whbase && br->br_ohph); */ | |
20417 | + skip = (wbr && wbr->wbr_whbase); | |
20418 | + if (skip) { | |
20419 | + if (do_plink) | |
20420 | + skip = !!wbr->wbr_plink; | |
20421 | + else | |
20422 | + skip = !wbr->wbr_plink; | |
20423 | + } | |
20424 | + break; | |
20425 | + | |
20426 | + default: | |
20427 | + BUG(); | |
20428 | + } | |
20429 | + if (wbr) | |
20430 | + wbr_wh_read_unlock(wbr); | |
20431 | + | |
20432 | + if (skip) | |
20433 | + continue; | |
20434 | + | |
20435 | + hdir = au_hi(dir, bindex); | |
4a4d8108 | 20436 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 20437 | + if (wbr) |
20438 | + wbr_wh_write_lock(wbr); | |
20439 | + err = au_wh_init(au_h_dptr(root, bindex), br, sb); | |
20440 | + if (wbr) | |
20441 | + wbr_wh_write_unlock(wbr); | |
4a4d8108 | 20442 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 20443 | + |
20444 | + if (!err && do_free) { | |
20445 | + kfree(wbr); | |
20446 | + br->br_wbr = NULL; | |
20447 | + } | |
20448 | + } | |
20449 | + | |
20450 | + return err; | |
20451 | +} | |
20452 | + | |
20453 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts) | |
20454 | +{ | |
20455 | + int err; | |
20456 | + unsigned int tmp; | |
027c5e7a | 20457 | + aufs_bindex_t bindex, bend; |
1facf9fc | 20458 | + struct au_opt *opt; |
20459 | + struct au_opt_xino *opt_xino, xino; | |
20460 | + struct au_sbinfo *sbinfo; | |
027c5e7a | 20461 | + struct au_branch *br; |
1facf9fc | 20462 | + |
dece6358 AM |
20463 | + SiMustWriteLock(sb); |
20464 | + | |
1facf9fc | 20465 | + err = 0; |
20466 | + opt_xino = NULL; | |
20467 | + opt = opts->opt; | |
20468 | + while (err >= 0 && opt->type != Opt_tail) | |
20469 | + err = au_opt_simple(sb, opt++, opts); | |
20470 | + if (err > 0) | |
20471 | + err = 0; | |
20472 | + else if (unlikely(err < 0)) | |
20473 | + goto out; | |
20474 | + | |
20475 | + /* disable xino and udba temporary */ | |
20476 | + sbinfo = au_sbi(sb); | |
20477 | + tmp = sbinfo->si_mntflags; | |
20478 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
20479 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_REVAL); | |
20480 | + | |
20481 | + opt = opts->opt; | |
20482 | + while (err >= 0 && opt->type != Opt_tail) | |
20483 | + err = au_opt_br(sb, opt++, opts); | |
20484 | + if (err > 0) | |
20485 | + err = 0; | |
20486 | + else if (unlikely(err < 0)) | |
20487 | + goto out; | |
20488 | + | |
20489 | + bend = au_sbend(sb); | |
20490 | + if (unlikely(bend < 0)) { | |
20491 | + err = -EINVAL; | |
4a4d8108 | 20492 | + pr_err("no branches\n"); |
1facf9fc | 20493 | + goto out; |
20494 | + } | |
20495 | + | |
20496 | + if (au_opt_test(tmp, XINO)) | |
20497 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
20498 | + opt = opts->opt; | |
20499 | + while (!err && opt->type != Opt_tail) | |
20500 | + err = au_opt_xino(sb, opt++, &opt_xino, opts); | |
20501 | + if (unlikely(err)) | |
20502 | + goto out; | |
20503 | + | |
20504 | + err = au_opts_verify(sb, sb->s_flags, tmp); | |
20505 | + if (unlikely(err)) | |
20506 | + goto out; | |
20507 | + | |
20508 | + /* restore xino */ | |
20509 | + if (au_opt_test(tmp, XINO) && !opt_xino) { | |
20510 | + xino.file = au_xino_def(sb); | |
20511 | + err = PTR_ERR(xino.file); | |
20512 | + if (IS_ERR(xino.file)) | |
20513 | + goto out; | |
20514 | + | |
20515 | + err = au_xino_set(sb, &xino, /*remount*/0); | |
20516 | + fput(xino.file); | |
20517 | + if (unlikely(err)) | |
20518 | + goto out; | |
20519 | + } | |
20520 | + | |
20521 | + /* restore udba */ | |
027c5e7a | 20522 | + tmp &= AuOptMask_UDBA; |
1facf9fc | 20523 | + sbinfo->si_mntflags &= ~AuOptMask_UDBA; |
027c5e7a AM |
20524 | + sbinfo->si_mntflags |= tmp; |
20525 | + bend = au_sbend(sb); | |
20526 | + for (bindex = 0; bindex <= bend; bindex++) { | |
20527 | + br = au_sbr(sb, bindex); | |
20528 | + err = au_hnotify_reset_br(tmp, br, br->br_perm); | |
20529 | + if (unlikely(err)) | |
20530 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", | |
20531 | + bindex, err); | |
20532 | + /* go on even if err */ | |
20533 | + } | |
4a4d8108 | 20534 | + if (au_opt_test(tmp, UDBA_HNOTIFY)) { |
1facf9fc | 20535 | + struct inode *dir = sb->s_root->d_inode; |
4a4d8108 | 20536 | + au_hn_reset(dir, au_hi_flags(dir, /*isdir*/1) & ~AuHi_XINO); |
1facf9fc | 20537 | + } |
20538 | + | |
4f0767ce | 20539 | +out: |
1facf9fc | 20540 | + return err; |
20541 | +} | |
20542 | + | |
20543 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts) | |
20544 | +{ | |
20545 | + int err, rerr; | |
20546 | + struct inode *dir; | |
20547 | + struct au_opt_xino *opt_xino; | |
20548 | + struct au_opt *opt; | |
20549 | + struct au_sbinfo *sbinfo; | |
20550 | + | |
dece6358 AM |
20551 | + SiMustWriteLock(sb); |
20552 | + | |
1facf9fc | 20553 | + dir = sb->s_root->d_inode; |
20554 | + sbinfo = au_sbi(sb); | |
20555 | + err = 0; | |
20556 | + opt_xino = NULL; | |
20557 | + opt = opts->opt; | |
20558 | + while (err >= 0 && opt->type != Opt_tail) { | |
20559 | + err = au_opt_simple(sb, opt, opts); | |
20560 | + if (!err) | |
20561 | + err = au_opt_br(sb, opt, opts); | |
20562 | + if (!err) | |
20563 | + err = au_opt_xino(sb, opt, &opt_xino, opts); | |
20564 | + opt++; | |
20565 | + } | |
20566 | + if (err > 0) | |
20567 | + err = 0; | |
20568 | + AuTraceErr(err); | |
20569 | + /* go on even err */ | |
20570 | + | |
20571 | + rerr = au_opts_verify(sb, opts->sb_flags, /*pending*/0); | |
20572 | + if (unlikely(rerr && !err)) | |
20573 | + err = rerr; | |
20574 | + | |
20575 | + if (au_ftest_opts(opts->flags, TRUNC_XIB)) { | |
20576 | + rerr = au_xib_trunc(sb); | |
20577 | + if (unlikely(rerr && !err)) | |
20578 | + err = rerr; | |
20579 | + } | |
20580 | + | |
20581 | + /* will be handled by the caller */ | |
027c5e7a | 20582 | + if (!au_ftest_opts(opts->flags, REFRESH) |
1facf9fc | 20583 | + && (opts->given_udba || au_opt_test(sbinfo->si_mntflags, XINO))) |
027c5e7a | 20584 | + au_fset_opts(opts->flags, REFRESH); |
1facf9fc | 20585 | + |
20586 | + AuDbg("status 0x%x\n", opts->flags); | |
20587 | + return err; | |
20588 | +} | |
20589 | + | |
20590 | +/* ---------------------------------------------------------------------- */ | |
20591 | + | |
20592 | +unsigned int au_opt_udba(struct super_block *sb) | |
20593 | +{ | |
20594 | + return au_mntflags(sb) & AuOptMask_UDBA; | |
20595 | +} | |
7f207e10 AM |
20596 | diff -urN /usr/share/empty/fs/aufs/opts.h linux/fs/aufs/opts.h |
20597 | --- /usr/share/empty/fs/aufs/opts.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 20598 | +++ linux/fs/aufs/opts.h 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 20599 | @@ -0,0 +1,210 @@ |
1facf9fc | 20600 | +/* |
027c5e7a | 20601 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 20602 | + * |
20603 | + * This program, aufs is free software; you can redistribute it and/or modify | |
20604 | + * it under the terms of the GNU General Public License as published by | |
20605 | + * the Free Software Foundation; either version 2 of the License, or | |
20606 | + * (at your option) any later version. | |
dece6358 AM |
20607 | + * |
20608 | + * This program is distributed in the hope that it will be useful, | |
20609 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20610 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20611 | + * GNU General Public License for more details. | |
20612 | + * | |
20613 | + * You should have received a copy of the GNU General Public License | |
20614 | + * along with this program; if not, write to the Free Software | |
20615 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 20616 | + */ |
20617 | + | |
20618 | +/* | |
20619 | + * mount options/flags | |
20620 | + */ | |
20621 | + | |
20622 | +#ifndef __AUFS_OPTS_H__ | |
20623 | +#define __AUFS_OPTS_H__ | |
20624 | + | |
20625 | +#ifdef __KERNEL__ | |
20626 | + | |
dece6358 | 20627 | +#include <linux/path.h> |
1facf9fc | 20628 | +#include <linux/aufs_type.h> |
20629 | + | |
dece6358 AM |
20630 | +struct file; |
20631 | +struct super_block; | |
20632 | + | |
1facf9fc | 20633 | +/* ---------------------------------------------------------------------- */ |
20634 | + | |
20635 | +/* mount flags */ | |
20636 | +#define AuOpt_XINO 1 /* external inode number bitmap | |
20637 | + and translation table */ | |
20638 | +#define AuOpt_TRUNC_XINO (1 << 1) /* truncate xino files */ | |
20639 | +#define AuOpt_UDBA_NONE (1 << 2) /* users direct branch access */ | |
20640 | +#define AuOpt_UDBA_REVAL (1 << 3) | |
4a4d8108 | 20641 | +#define AuOpt_UDBA_HNOTIFY (1 << 4) |
dece6358 AM |
20642 | +#define AuOpt_SHWH (1 << 5) /* show whiteout */ |
20643 | +#define AuOpt_PLINK (1 << 6) /* pseudo-link */ | |
20644 | +#define AuOpt_DIRPERM1 (1 << 7) /* unimplemented */ | |
20645 | +#define AuOpt_REFROF (1 << 8) /* unimplemented */ | |
20646 | +#define AuOpt_ALWAYS_DIROPQ (1 << 9) /* policy to creating diropq */ | |
20647 | +#define AuOpt_SUM (1 << 10) /* summation for statfs(2) */ | |
20648 | +#define AuOpt_SUM_W (1 << 11) /* unimplemented */ | |
20649 | +#define AuOpt_WARN_PERM (1 << 12) /* warn when add-branch */ | |
20650 | +#define AuOpt_VERBOSE (1 << 13) /* busy inode when del-branch */ | |
4a4d8108 | 20651 | +#define AuOpt_DIO (1 << 14) /* direct io */ |
1facf9fc | 20652 | + |
4a4d8108 AM |
20653 | +#ifndef CONFIG_AUFS_HNOTIFY |
20654 | +#undef AuOpt_UDBA_HNOTIFY | |
20655 | +#define AuOpt_UDBA_HNOTIFY 0 | |
1facf9fc | 20656 | +#endif |
dece6358 AM |
20657 | +#ifndef CONFIG_AUFS_SHWH |
20658 | +#undef AuOpt_SHWH | |
20659 | +#define AuOpt_SHWH 0 | |
20660 | +#endif | |
1facf9fc | 20661 | + |
20662 | +#define AuOpt_Def (AuOpt_XINO \ | |
20663 | + | AuOpt_UDBA_REVAL \ | |
20664 | + | AuOpt_PLINK \ | |
20665 | + /* | AuOpt_DIRPERM1 */ \ | |
20666 | + | AuOpt_WARN_PERM) | |
20667 | +#define AuOptMask_UDBA (AuOpt_UDBA_NONE \ | |
20668 | + | AuOpt_UDBA_REVAL \ | |
4a4d8108 | 20669 | + | AuOpt_UDBA_HNOTIFY) |
1facf9fc | 20670 | + |
20671 | +#define au_opt_test(flags, name) (flags & AuOpt_##name) | |
20672 | +#define au_opt_set(flags, name) do { \ | |
20673 | + BUILD_BUG_ON(AuOpt_##name & AuOptMask_UDBA); \ | |
20674 | + ((flags) |= AuOpt_##name); \ | |
20675 | +} while (0) | |
20676 | +#define au_opt_set_udba(flags, name) do { \ | |
20677 | + (flags) &= ~AuOptMask_UDBA; \ | |
20678 | + ((flags) |= AuOpt_##name); \ | |
20679 | +} while (0) | |
7f207e10 AM |
20680 | +#define au_opt_clr(flags, name) do { \ |
20681 | + ((flags) &= ~AuOpt_##name); \ | |
20682 | +} while (0) | |
1facf9fc | 20683 | + |
e49829fe JR |
20684 | +static inline unsigned int au_opts_plink(unsigned int mntflags) |
20685 | +{ | |
20686 | +#ifdef CONFIG_PROC_FS | |
20687 | + return mntflags; | |
20688 | +#else | |
20689 | + return mntflags & ~AuOpt_PLINK; | |
20690 | +#endif | |
20691 | +} | |
20692 | + | |
1facf9fc | 20693 | +/* ---------------------------------------------------------------------- */ |
20694 | + | |
20695 | +/* policies to select one among multiple writable branches */ | |
20696 | +enum { | |
20697 | + AuWbrCreate_TDP, /* top down parent */ | |
20698 | + AuWbrCreate_RR, /* round robin */ | |
20699 | + AuWbrCreate_MFS, /* most free space */ | |
20700 | + AuWbrCreate_MFSV, /* mfs with seconds */ | |
20701 | + AuWbrCreate_MFSRR, /* mfs then rr */ | |
20702 | + AuWbrCreate_MFSRRV, /* mfs then rr with seconds */ | |
20703 | + AuWbrCreate_PMFS, /* parent and mfs */ | |
20704 | + AuWbrCreate_PMFSV, /* parent and mfs with seconds */ | |
20705 | + | |
20706 | + AuWbrCreate_Def = AuWbrCreate_TDP | |
20707 | +}; | |
20708 | + | |
20709 | +enum { | |
20710 | + AuWbrCopyup_TDP, /* top down parent */ | |
20711 | + AuWbrCopyup_BUP, /* bottom up parent */ | |
20712 | + AuWbrCopyup_BU, /* bottom up */ | |
20713 | + | |
20714 | + AuWbrCopyup_Def = AuWbrCopyup_TDP | |
20715 | +}; | |
20716 | + | |
20717 | +/* ---------------------------------------------------------------------- */ | |
20718 | + | |
20719 | +struct au_opt_add { | |
20720 | + aufs_bindex_t bindex; | |
20721 | + char *pathname; | |
20722 | + int perm; | |
20723 | + struct path path; | |
20724 | +}; | |
20725 | + | |
20726 | +struct au_opt_del { | |
20727 | + char *pathname; | |
20728 | + struct path h_path; | |
20729 | +}; | |
20730 | + | |
20731 | +struct au_opt_mod { | |
20732 | + char *path; | |
20733 | + int perm; | |
20734 | + struct dentry *h_root; | |
20735 | +}; | |
20736 | + | |
20737 | +struct au_opt_xino { | |
20738 | + char *path; | |
20739 | + struct file *file; | |
20740 | +}; | |
20741 | + | |
20742 | +struct au_opt_xino_itrunc { | |
20743 | + aufs_bindex_t bindex; | |
20744 | +}; | |
20745 | + | |
20746 | +struct au_opt_wbr_create { | |
20747 | + int wbr_create; | |
20748 | + int mfs_second; | |
20749 | + unsigned long long mfsrr_watermark; | |
20750 | +}; | |
20751 | + | |
20752 | +struct au_opt { | |
20753 | + int type; | |
20754 | + union { | |
20755 | + struct au_opt_xino xino; | |
20756 | + struct au_opt_xino_itrunc xino_itrunc; | |
20757 | + struct au_opt_add add; | |
20758 | + struct au_opt_del del; | |
20759 | + struct au_opt_mod mod; | |
20760 | + int dirwh; | |
20761 | + int rdcache; | |
20762 | + unsigned int rdblk; | |
20763 | + unsigned int rdhash; | |
20764 | + int udba; | |
20765 | + struct au_opt_wbr_create wbr_create; | |
20766 | + int wbr_copyup; | |
20767 | + }; | |
20768 | +}; | |
20769 | + | |
20770 | +/* opts flags */ | |
20771 | +#define AuOpts_REMOUNT 1 | |
027c5e7a AM |
20772 | +#define AuOpts_REFRESH (1 << 1) |
20773 | +#define AuOpts_TRUNC_XIB (1 << 2) | |
20774 | +#define AuOpts_REFRESH_DYAOP (1 << 3) | |
1facf9fc | 20775 | +#define au_ftest_opts(flags, name) ((flags) & AuOpts_##name) |
7f207e10 AM |
20776 | +#define au_fset_opts(flags, name) \ |
20777 | + do { (flags) |= AuOpts_##name; } while (0) | |
20778 | +#define au_fclr_opts(flags, name) \ | |
20779 | + do { (flags) &= ~AuOpts_##name; } while (0) | |
1facf9fc | 20780 | + |
20781 | +struct au_opts { | |
20782 | + struct au_opt *opt; | |
20783 | + int max_opt; | |
20784 | + | |
20785 | + unsigned int given_udba; | |
20786 | + unsigned int flags; | |
20787 | + unsigned long sb_flags; | |
20788 | +}; | |
20789 | + | |
20790 | +/* ---------------------------------------------------------------------- */ | |
20791 | + | |
20792 | +const char *au_optstr_br_perm(int brperm); | |
20793 | +const char *au_optstr_udba(int udba); | |
20794 | +const char *au_optstr_wbr_copyup(int wbr_copyup); | |
20795 | +const char *au_optstr_wbr_create(int wbr_create); | |
20796 | + | |
20797 | +void au_opts_free(struct au_opts *opts); | |
20798 | +int au_opts_parse(struct super_block *sb, char *str, struct au_opts *opts); | |
20799 | +int au_opts_verify(struct super_block *sb, unsigned long sb_flags, | |
20800 | + unsigned int pending); | |
20801 | +int au_opts_mount(struct super_block *sb, struct au_opts *opts); | |
20802 | +int au_opts_remount(struct super_block *sb, struct au_opts *opts); | |
20803 | + | |
20804 | +unsigned int au_opt_udba(struct super_block *sb); | |
20805 | + | |
20806 | +/* ---------------------------------------------------------------------- */ | |
20807 | + | |
20808 | +#endif /* __KERNEL__ */ | |
20809 | +#endif /* __AUFS_OPTS_H__ */ | |
7f207e10 AM |
20810 | diff -urN /usr/share/empty/fs/aufs/plink.c linux/fs/aufs/plink.c |
20811 | --- /usr/share/empty/fs/aufs/plink.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 20812 | +++ linux/fs/aufs/plink.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 20813 | @@ -0,0 +1,515 @@ |
1facf9fc | 20814 | +/* |
027c5e7a | 20815 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 20816 | + * |
20817 | + * This program, aufs is free software; you can redistribute it and/or modify | |
20818 | + * it under the terms of the GNU General Public License as published by | |
20819 | + * the Free Software Foundation; either version 2 of the License, or | |
20820 | + * (at your option) any later version. | |
dece6358 AM |
20821 | + * |
20822 | + * This program is distributed in the hope that it will be useful, | |
20823 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
20824 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
20825 | + * GNU General Public License for more details. | |
20826 | + * | |
20827 | + * You should have received a copy of the GNU General Public License | |
20828 | + * along with this program; if not, write to the Free Software | |
20829 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 20830 | + */ |
20831 | + | |
20832 | +/* | |
20833 | + * pseudo-link | |
20834 | + */ | |
20835 | + | |
20836 | +#include "aufs.h" | |
20837 | + | |
20838 | +/* | |
e49829fe | 20839 | + * the pseudo-link maintenance mode. |
1facf9fc | 20840 | + * during a user process maintains the pseudo-links, |
20841 | + * prohibit adding a new plink and branch manipulation. | |
e49829fe JR |
20842 | + * |
20843 | + * Flags | |
20844 | + * NOPLM: | |
20845 | + * For entry functions which will handle plink, and i_mutex is already held | |
20846 | + * in VFS. | |
20847 | + * They cannot wait and should return an error at once. | |
20848 | + * Callers has to check the error. | |
20849 | + * NOPLMW: | |
20850 | + * For entry functions which will handle plink, but i_mutex is not held | |
20851 | + * in VFS. | |
20852 | + * They can wait the plink maintenance mode to finish. | |
20853 | + * | |
20854 | + * They behave like F_SETLK and F_SETLKW. | |
20855 | + * If the caller never handle plink, then both flags are unnecessary. | |
1facf9fc | 20856 | + */ |
e49829fe JR |
20857 | + |
20858 | +int au_plink_maint(struct super_block *sb, int flags) | |
1facf9fc | 20859 | +{ |
e49829fe JR |
20860 | + int err; |
20861 | + pid_t pid, ppid; | |
20862 | + struct au_sbinfo *sbi; | |
dece6358 AM |
20863 | + |
20864 | + SiMustAnyLock(sb); | |
20865 | + | |
e49829fe JR |
20866 | + err = 0; |
20867 | + if (!au_opt_test(au_mntflags(sb), PLINK)) | |
20868 | + goto out; | |
20869 | + | |
20870 | + sbi = au_sbi(sb); | |
20871 | + pid = sbi->si_plink_maint_pid; | |
20872 | + if (!pid || pid == current->pid) | |
20873 | + goto out; | |
20874 | + | |
20875 | + /* todo: it highly depends upon /sbin/mount.aufs */ | |
20876 | + rcu_read_lock(); | |
20877 | + ppid = task_pid_vnr(rcu_dereference(current->real_parent)); | |
20878 | + rcu_read_unlock(); | |
20879 | + if (pid == ppid) | |
20880 | + goto out; | |
20881 | + | |
20882 | + if (au_ftest_lock(flags, NOPLMW)) { | |
027c5e7a AM |
20883 | + /* if there is no i_mutex lock in VFS, we don't need to wait */ |
20884 | + /* AuDebugOn(!lockdep_depth(current)); */ | |
e49829fe JR |
20885 | + while (sbi->si_plink_maint_pid) { |
20886 | + si_read_unlock(sb); | |
20887 | + /* gave up wake_up_bit() */ | |
20888 | + wait_event(sbi->si_plink_wq, !sbi->si_plink_maint_pid); | |
20889 | + | |
20890 | + if (au_ftest_lock(flags, FLUSH)) | |
20891 | + au_nwt_flush(&sbi->si_nowait); | |
20892 | + si_noflush_read_lock(sb); | |
20893 | + } | |
20894 | + } else if (au_ftest_lock(flags, NOPLM)) { | |
20895 | + AuDbg("ppid %d, pid %d\n", ppid, pid); | |
20896 | + err = -EAGAIN; | |
20897 | + } | |
20898 | + | |
20899 | +out: | |
20900 | + return err; | |
4a4d8108 AM |
20901 | +} |
20902 | + | |
e49829fe | 20903 | +void au_plink_maint_leave(struct au_sbinfo *sbinfo) |
4a4d8108 | 20904 | +{ |
4a4d8108 | 20905 | + spin_lock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 20906 | + sbinfo->si_plink_maint_pid = 0; |
4a4d8108 | 20907 | + spin_unlock(&sbinfo->si_plink_maint_lock); |
027c5e7a | 20908 | + wake_up_all(&sbinfo->si_plink_wq); |
4a4d8108 AM |
20909 | +} |
20910 | + | |
e49829fe | 20911 | +int au_plink_maint_enter(struct super_block *sb) |
4a4d8108 AM |
20912 | +{ |
20913 | + int err; | |
4a4d8108 AM |
20914 | + struct au_sbinfo *sbinfo; |
20915 | + | |
20916 | + err = 0; | |
4a4d8108 AM |
20917 | + sbinfo = au_sbi(sb); |
20918 | + /* make sure i am the only one in this fs */ | |
e49829fe JR |
20919 | + si_write_lock(sb, AuLock_FLUSH); |
20920 | + if (au_opt_test(au_mntflags(sb), PLINK)) { | |
20921 | + spin_lock(&sbinfo->si_plink_maint_lock); | |
20922 | + if (!sbinfo->si_plink_maint_pid) | |
20923 | + sbinfo->si_plink_maint_pid = current->pid; | |
20924 | + else | |
20925 | + err = -EBUSY; | |
20926 | + spin_unlock(&sbinfo->si_plink_maint_lock); | |
20927 | + } | |
4a4d8108 AM |
20928 | + si_write_unlock(sb); |
20929 | + | |
20930 | + return err; | |
1facf9fc | 20931 | +} |
20932 | + | |
20933 | +/* ---------------------------------------------------------------------- */ | |
20934 | + | |
20935 | +struct pseudo_link { | |
4a4d8108 AM |
20936 | + union { |
20937 | + struct list_head list; | |
20938 | + struct rcu_head rcu; | |
20939 | + }; | |
1facf9fc | 20940 | + struct inode *inode; |
20941 | +}; | |
20942 | + | |
20943 | +#ifdef CONFIG_AUFS_DEBUG | |
20944 | +void au_plink_list(struct super_block *sb) | |
20945 | +{ | |
20946 | + struct au_sbinfo *sbinfo; | |
20947 | + struct list_head *plink_list; | |
20948 | + struct pseudo_link *plink; | |
20949 | + | |
dece6358 AM |
20950 | + SiMustAnyLock(sb); |
20951 | + | |
1facf9fc | 20952 | + sbinfo = au_sbi(sb); |
20953 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 20954 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 20955 | + |
20956 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
20957 | + rcu_read_lock(); |
20958 | + list_for_each_entry_rcu(plink, plink_list, list) | |
1facf9fc | 20959 | + AuDbg("%lu\n", plink->inode->i_ino); |
4a4d8108 | 20960 | + rcu_read_unlock(); |
1facf9fc | 20961 | +} |
20962 | +#endif | |
20963 | + | |
20964 | +/* is the inode pseudo-linked? */ | |
20965 | +int au_plink_test(struct inode *inode) | |
20966 | +{ | |
20967 | + int found; | |
20968 | + struct au_sbinfo *sbinfo; | |
20969 | + struct list_head *plink_list; | |
20970 | + struct pseudo_link *plink; | |
20971 | + | |
20972 | + sbinfo = au_sbi(inode->i_sb); | |
dece6358 | 20973 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
1facf9fc | 20974 | + AuDebugOn(!au_opt_test(au_mntflags(inode->i_sb), PLINK)); |
e49829fe | 20975 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
1facf9fc | 20976 | + |
20977 | + found = 0; | |
20978 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
20979 | + rcu_read_lock(); |
20980 | + list_for_each_entry_rcu(plink, plink_list, list) | |
1facf9fc | 20981 | + if (plink->inode == inode) { |
20982 | + found = 1; | |
20983 | + break; | |
20984 | + } | |
4a4d8108 | 20985 | + rcu_read_unlock(); |
1facf9fc | 20986 | + return found; |
20987 | +} | |
20988 | + | |
20989 | +/* ---------------------------------------------------------------------- */ | |
20990 | + | |
20991 | +/* | |
20992 | + * generate a name for plink. | |
20993 | + * the file will be stored under AUFS_WH_PLINKDIR. | |
20994 | + */ | |
20995 | +/* 20 is max digits length of ulong 64 */ | |
20996 | +#define PLINK_NAME_LEN ((20 + 1) * 2) | |
20997 | + | |
20998 | +static int plink_name(char *name, int len, struct inode *inode, | |
20999 | + aufs_bindex_t bindex) | |
21000 | +{ | |
21001 | + int rlen; | |
21002 | + struct inode *h_inode; | |
21003 | + | |
21004 | + h_inode = au_h_iptr(inode, bindex); | |
21005 | + rlen = snprintf(name, len, "%lu.%lu", inode->i_ino, h_inode->i_ino); | |
21006 | + return rlen; | |
21007 | +} | |
21008 | + | |
7f207e10 AM |
21009 | +struct au_do_plink_lkup_args { |
21010 | + struct dentry **errp; | |
21011 | + struct qstr *tgtname; | |
21012 | + struct dentry *h_parent; | |
21013 | + struct au_branch *br; | |
21014 | +}; | |
21015 | + | |
21016 | +static struct dentry *au_do_plink_lkup(struct qstr *tgtname, | |
21017 | + struct dentry *h_parent, | |
21018 | + struct au_branch *br) | |
21019 | +{ | |
21020 | + struct dentry *h_dentry; | |
21021 | + struct mutex *h_mtx; | |
21022 | + | |
21023 | + h_mtx = &h_parent->d_inode->i_mutex; | |
21024 | + mutex_lock_nested(h_mtx, AuLsc_I_CHILD2); | |
21025 | + h_dentry = au_lkup_one(tgtname, h_parent, br, /*nd*/NULL); | |
21026 | + mutex_unlock(h_mtx); | |
21027 | + return h_dentry; | |
21028 | +} | |
21029 | + | |
21030 | +static void au_call_do_plink_lkup(void *args) | |
21031 | +{ | |
21032 | + struct au_do_plink_lkup_args *a = args; | |
21033 | + *a->errp = au_do_plink_lkup(a->tgtname, a->h_parent, a->br); | |
21034 | +} | |
21035 | + | |
1facf9fc | 21036 | +/* lookup the plink-ed @inode under the branch at @bindex */ |
21037 | +struct dentry *au_plink_lkup(struct inode *inode, aufs_bindex_t bindex) | |
21038 | +{ | |
21039 | + struct dentry *h_dentry, *h_parent; | |
21040 | + struct au_branch *br; | |
21041 | + struct inode *h_dir; | |
7f207e10 | 21042 | + int wkq_err; |
1facf9fc | 21043 | + char a[PLINK_NAME_LEN]; |
21044 | + struct qstr tgtname = { | |
21045 | + .name = a | |
21046 | + }; | |
21047 | + | |
e49829fe JR |
21048 | + AuDebugOn(au_plink_maint(inode->i_sb, AuLock_NOPLM)); |
21049 | + | |
1facf9fc | 21050 | + br = au_sbr(inode->i_sb, bindex); |
21051 | + h_parent = br->br_wbr->wbr_plink; | |
21052 | + h_dir = h_parent->d_inode; | |
21053 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); | |
21054 | + | |
7f207e10 AM |
21055 | + if (current_fsuid()) { |
21056 | + struct au_do_plink_lkup_args args = { | |
21057 | + .errp = &h_dentry, | |
21058 | + .tgtname = &tgtname, | |
21059 | + .h_parent = h_parent, | |
21060 | + .br = br | |
21061 | + }; | |
21062 | + | |
21063 | + wkq_err = au_wkq_wait(au_call_do_plink_lkup, &args); | |
21064 | + if (unlikely(wkq_err)) | |
21065 | + h_dentry = ERR_PTR(wkq_err); | |
21066 | + } else | |
21067 | + h_dentry = au_do_plink_lkup(&tgtname, h_parent, br); | |
21068 | + | |
1facf9fc | 21069 | + return h_dentry; |
21070 | +} | |
21071 | + | |
21072 | +/* create a pseudo-link */ | |
21073 | +static int do_whplink(struct qstr *tgt, struct dentry *h_parent, | |
21074 | + struct dentry *h_dentry, struct au_branch *br) | |
21075 | +{ | |
21076 | + int err; | |
21077 | + struct path h_path = { | |
21078 | + .mnt = br->br_mnt | |
21079 | + }; | |
21080 | + struct inode *h_dir; | |
21081 | + | |
21082 | + h_dir = h_parent->d_inode; | |
7f207e10 | 21083 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_CHILD2); |
4f0767ce | 21084 | +again: |
1facf9fc | 21085 | + h_path.dentry = au_lkup_one(tgt, h_parent, br, /*nd*/NULL); |
21086 | + err = PTR_ERR(h_path.dentry); | |
21087 | + if (IS_ERR(h_path.dentry)) | |
21088 | + goto out; | |
21089 | + | |
21090 | + err = 0; | |
21091 | + /* wh.plink dir is not monitored */ | |
7f207e10 | 21092 | + /* todo: is it really safe? */ |
1facf9fc | 21093 | + if (h_path.dentry->d_inode |
21094 | + && h_path.dentry->d_inode != h_dentry->d_inode) { | |
21095 | + err = vfsub_unlink(h_dir, &h_path, /*force*/0); | |
21096 | + dput(h_path.dentry); | |
21097 | + h_path.dentry = NULL; | |
21098 | + if (!err) | |
21099 | + goto again; | |
21100 | + } | |
21101 | + if (!err && !h_path.dentry->d_inode) | |
21102 | + err = vfsub_link(h_dentry, h_dir, &h_path); | |
21103 | + dput(h_path.dentry); | |
21104 | + | |
4f0767ce | 21105 | +out: |
7f207e10 | 21106 | + mutex_unlock(&h_dir->i_mutex); |
1facf9fc | 21107 | + return err; |
21108 | +} | |
21109 | + | |
21110 | +struct do_whplink_args { | |
21111 | + int *errp; | |
21112 | + struct qstr *tgt; | |
21113 | + struct dentry *h_parent; | |
21114 | + struct dentry *h_dentry; | |
21115 | + struct au_branch *br; | |
21116 | +}; | |
21117 | + | |
21118 | +static void call_do_whplink(void *args) | |
21119 | +{ | |
21120 | + struct do_whplink_args *a = args; | |
21121 | + *a->errp = do_whplink(a->tgt, a->h_parent, a->h_dentry, a->br); | |
21122 | +} | |
21123 | + | |
21124 | +static int whplink(struct dentry *h_dentry, struct inode *inode, | |
21125 | + aufs_bindex_t bindex, struct au_branch *br) | |
21126 | +{ | |
21127 | + int err, wkq_err; | |
21128 | + struct au_wbr *wbr; | |
21129 | + struct dentry *h_parent; | |
21130 | + struct inode *h_dir; | |
21131 | + char a[PLINK_NAME_LEN]; | |
21132 | + struct qstr tgtname = { | |
21133 | + .name = a | |
21134 | + }; | |
21135 | + | |
21136 | + wbr = au_sbr(inode->i_sb, bindex)->br_wbr; | |
21137 | + h_parent = wbr->wbr_plink; | |
21138 | + h_dir = h_parent->d_inode; | |
21139 | + tgtname.len = plink_name(a, sizeof(a), inode, bindex); | |
21140 | + | |
21141 | + /* always superio. */ | |
b752ccd1 | 21142 | + if (current_fsuid()) { |
1facf9fc | 21143 | + struct do_whplink_args args = { |
21144 | + .errp = &err, | |
21145 | + .tgt = &tgtname, | |
21146 | + .h_parent = h_parent, | |
21147 | + .h_dentry = h_dentry, | |
21148 | + .br = br | |
21149 | + }; | |
21150 | + wkq_err = au_wkq_wait(call_do_whplink, &args); | |
21151 | + if (unlikely(wkq_err)) | |
21152 | + err = wkq_err; | |
21153 | + } else | |
21154 | + err = do_whplink(&tgtname, h_parent, h_dentry, br); | |
1facf9fc | 21155 | + |
21156 | + return err; | |
21157 | +} | |
21158 | + | |
21159 | +/* free a single plink */ | |
21160 | +static void do_put_plink(struct pseudo_link *plink, int do_del) | |
21161 | +{ | |
1facf9fc | 21162 | + if (do_del) |
21163 | + list_del(&plink->list); | |
4a4d8108 AM |
21164 | + iput(plink->inode); |
21165 | + kfree(plink); | |
21166 | +} | |
21167 | + | |
21168 | +static void do_put_plink_rcu(struct rcu_head *rcu) | |
21169 | +{ | |
21170 | + struct pseudo_link *plink; | |
21171 | + | |
21172 | + plink = container_of(rcu, struct pseudo_link, rcu); | |
21173 | + iput(plink->inode); | |
1facf9fc | 21174 | + kfree(plink); |
21175 | +} | |
21176 | + | |
21177 | +/* | |
21178 | + * create a new pseudo-link for @h_dentry on @bindex. | |
21179 | + * the linked inode is held in aufs @inode. | |
21180 | + */ | |
21181 | +void au_plink_append(struct inode *inode, aufs_bindex_t bindex, | |
21182 | + struct dentry *h_dentry) | |
21183 | +{ | |
21184 | + struct super_block *sb; | |
21185 | + struct au_sbinfo *sbinfo; | |
21186 | + struct list_head *plink_list; | |
4a4d8108 | 21187 | + struct pseudo_link *plink, *tmp; |
1facf9fc | 21188 | + int found, err, cnt; |
21189 | + | |
21190 | + sb = inode->i_sb; | |
21191 | + sbinfo = au_sbi(sb); | |
21192 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 21193 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 21194 | + |
1facf9fc | 21195 | + cnt = 0; |
21196 | + found = 0; | |
21197 | + plink_list = &sbinfo->si_plink.head; | |
4a4d8108 AM |
21198 | + rcu_read_lock(); |
21199 | + list_for_each_entry_rcu(plink, plink_list, list) { | |
1facf9fc | 21200 | + cnt++; |
21201 | + if (plink->inode == inode) { | |
21202 | + found = 1; | |
21203 | + break; | |
21204 | + } | |
21205 | + } | |
4a4d8108 AM |
21206 | + rcu_read_unlock(); |
21207 | + if (found) | |
1facf9fc | 21208 | + return; |
4a4d8108 AM |
21209 | + |
21210 | + tmp = kmalloc(sizeof(*plink), GFP_NOFS); | |
21211 | + if (tmp) | |
21212 | + tmp->inode = au_igrab(inode); | |
21213 | + else { | |
21214 | + err = -ENOMEM; | |
21215 | + goto out; | |
1facf9fc | 21216 | + } |
21217 | + | |
4a4d8108 AM |
21218 | + spin_lock(&sbinfo->si_plink.spin); |
21219 | + list_for_each_entry(plink, plink_list, list) { | |
21220 | + if (plink->inode == inode) { | |
21221 | + found = 1; | |
21222 | + break; | |
21223 | + } | |
1facf9fc | 21224 | + } |
4a4d8108 AM |
21225 | + if (!found) |
21226 | + list_add_rcu(&tmp->list, plink_list); | |
1facf9fc | 21227 | + spin_unlock(&sbinfo->si_plink.spin); |
4a4d8108 AM |
21228 | + if (!found) { |
21229 | + cnt++; | |
21230 | + WARN_ONCE(cnt > AUFS_PLINK_WARN, | |
21231 | + "unexpectedly many pseudo links, %d\n", cnt); | |
1facf9fc | 21232 | + err = whplink(h_dentry, inode, bindex, au_sbr(sb, bindex)); |
4a4d8108 AM |
21233 | + } else { |
21234 | + do_put_plink(tmp, 0); | |
21235 | + return; | |
1facf9fc | 21236 | + } |
21237 | + | |
4a4d8108 | 21238 | +out: |
1facf9fc | 21239 | + if (unlikely(err)) { |
4a4d8108 AM |
21240 | + pr_warning("err %d, damaged pseudo link.\n", err); |
21241 | + if (tmp) { | |
21242 | + au_spl_del_rcu(&tmp->list, &sbinfo->si_plink); | |
21243 | + call_rcu(&tmp->rcu, do_put_plink_rcu); | |
21244 | + } | |
1facf9fc | 21245 | + } |
21246 | +} | |
21247 | + | |
21248 | +/* free all plinks */ | |
e49829fe | 21249 | +void au_plink_put(struct super_block *sb, int verbose) |
1facf9fc | 21250 | +{ |
21251 | + struct au_sbinfo *sbinfo; | |
21252 | + struct list_head *plink_list; | |
21253 | + struct pseudo_link *plink, *tmp; | |
21254 | + | |
dece6358 AM |
21255 | + SiMustWriteLock(sb); |
21256 | + | |
1facf9fc | 21257 | + sbinfo = au_sbi(sb); |
21258 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 21259 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 21260 | + |
21261 | + plink_list = &sbinfo->si_plink.head; | |
21262 | + /* no spin_lock since sbinfo is write-locked */ | |
e49829fe | 21263 | + WARN(verbose && !list_empty(plink_list), "pseudo-link is not flushed"); |
1facf9fc | 21264 | + list_for_each_entry_safe(plink, tmp, plink_list, list) |
21265 | + do_put_plink(plink, 0); | |
21266 | + INIT_LIST_HEAD(plink_list); | |
21267 | +} | |
21268 | + | |
e49829fe JR |
21269 | +void au_plink_clean(struct super_block *sb, int verbose) |
21270 | +{ | |
21271 | + struct dentry *root; | |
21272 | + | |
21273 | + root = sb->s_root; | |
21274 | + aufs_write_lock(root); | |
21275 | + if (au_opt_test(au_mntflags(sb), PLINK)) | |
21276 | + au_plink_put(sb, verbose); | |
21277 | + aufs_write_unlock(root); | |
21278 | +} | |
21279 | + | |
1facf9fc | 21280 | +/* free the plinks on a branch specified by @br_id */ |
21281 | +void au_plink_half_refresh(struct super_block *sb, aufs_bindex_t br_id) | |
21282 | +{ | |
21283 | + struct au_sbinfo *sbinfo; | |
21284 | + struct list_head *plink_list; | |
21285 | + struct pseudo_link *plink, *tmp; | |
21286 | + struct inode *inode; | |
21287 | + aufs_bindex_t bstart, bend, bindex; | |
21288 | + unsigned char do_put; | |
21289 | + | |
dece6358 AM |
21290 | + SiMustWriteLock(sb); |
21291 | + | |
1facf9fc | 21292 | + sbinfo = au_sbi(sb); |
21293 | + AuDebugOn(!au_opt_test(au_mntflags(sb), PLINK)); | |
e49829fe | 21294 | + AuDebugOn(au_plink_maint(sb, AuLock_NOPLM)); |
1facf9fc | 21295 | + |
21296 | + plink_list = &sbinfo->si_plink.head; | |
21297 | + /* no spin_lock since sbinfo is write-locked */ | |
21298 | + list_for_each_entry_safe(plink, tmp, plink_list, list) { | |
21299 | + do_put = 0; | |
21300 | + inode = au_igrab(plink->inode); | |
21301 | + ii_write_lock_child(inode); | |
21302 | + bstart = au_ibstart(inode); | |
21303 | + bend = au_ibend(inode); | |
21304 | + if (bstart >= 0) { | |
21305 | + for (bindex = bstart; bindex <= bend; bindex++) { | |
21306 | + if (!au_h_iptr(inode, bindex) | |
21307 | + || au_ii_br_id(inode, bindex) != br_id) | |
21308 | + continue; | |
21309 | + au_set_h_iptr(inode, bindex, NULL, 0); | |
21310 | + do_put = 1; | |
21311 | + break; | |
21312 | + } | |
21313 | + } else | |
21314 | + do_put_plink(plink, 1); | |
21315 | + | |
dece6358 AM |
21316 | + if (do_put) { |
21317 | + for (bindex = bstart; bindex <= bend; bindex++) | |
21318 | + if (au_h_iptr(inode, bindex)) { | |
21319 | + do_put = 0; | |
21320 | + break; | |
21321 | + } | |
21322 | + if (do_put) | |
21323 | + do_put_plink(plink, 1); | |
21324 | + } | |
21325 | + ii_write_unlock(inode); | |
21326 | + iput(inode); | |
21327 | + } | |
21328 | +} | |
7f207e10 AM |
21329 | diff -urN /usr/share/empty/fs/aufs/poll.c linux/fs/aufs/poll.c |
21330 | --- /usr/share/empty/fs/aufs/poll.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 21331 | +++ linux/fs/aufs/poll.c 2011-08-24 13:30:24.734646739 +0200 |
dece6358 AM |
21332 | @@ -0,0 +1,56 @@ |
21333 | +/* | |
027c5e7a | 21334 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
dece6358 AM |
21335 | + * |
21336 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21337 | + * it under the terms of the GNU General Public License as published by | |
21338 | + * the Free Software Foundation; either version 2 of the License, or | |
21339 | + * (at your option) any later version. | |
21340 | + * | |
21341 | + * This program is distributed in the hope that it will be useful, | |
21342 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21343 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21344 | + * GNU General Public License for more details. | |
21345 | + * | |
21346 | + * You should have received a copy of the GNU General Public License | |
21347 | + * along with this program; if not, write to the Free Software | |
21348 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
21349 | + */ | |
21350 | + | |
1308ab2a | 21351 | +/* |
21352 | + * poll operation | |
21353 | + * There is only one filesystem which implements ->poll operation, currently. | |
21354 | + */ | |
21355 | + | |
21356 | +#include "aufs.h" | |
21357 | + | |
21358 | +unsigned int aufs_poll(struct file *file, poll_table *wait) | |
21359 | +{ | |
21360 | + unsigned int mask; | |
21361 | + int err; | |
21362 | + struct file *h_file; | |
21363 | + struct dentry *dentry; | |
21364 | + struct super_block *sb; | |
21365 | + | |
21366 | + /* We should pretend an error happened. */ | |
21367 | + mask = POLLERR /* | POLLIN | POLLOUT */; | |
21368 | + dentry = file->f_dentry; | |
21369 | + sb = dentry->d_sb; | |
e49829fe | 21370 | + si_read_lock(sb, AuLock_FLUSH | AuLock_NOPLMW); |
1308ab2a | 21371 | + err = au_reval_and_lock_fdi(file, au_reopen_nondir, /*wlock*/0); |
21372 | + if (unlikely(err)) | |
21373 | + goto out; | |
21374 | + | |
21375 | + /* it is not an error if h_file has no operation */ | |
21376 | + mask = DEFAULT_POLLMASK; | |
4a4d8108 | 21377 | + h_file = au_hf_top(file); |
1308ab2a | 21378 | + if (h_file->f_op && h_file->f_op->poll) |
21379 | + mask = h_file->f_op->poll(h_file, wait); | |
21380 | + | |
21381 | + di_read_unlock(dentry, AuLock_IR); | |
21382 | + fi_read_unlock(file); | |
21383 | + | |
4f0767ce | 21384 | +out: |
1308ab2a | 21385 | + si_read_unlock(sb); |
21386 | + AuTraceErr((int)mask); | |
21387 | + return mask; | |
21388 | +} | |
7f207e10 AM |
21389 | diff -urN /usr/share/empty/fs/aufs/procfs.c linux/fs/aufs/procfs.c |
21390 | --- /usr/share/empty/fs/aufs/procfs.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
21391 | +++ linux/fs/aufs/procfs.c 2011-08-24 13:30:24.734646739 +0200 |
21392 | @@ -0,0 +1,170 @@ | |
e49829fe | 21393 | +/* |
027c5e7a | 21394 | + * Copyright (C) 2010-2011 Junjiro R. Okajima |
e49829fe JR |
21395 | + * |
21396 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21397 | + * it under the terms of the GNU General Public License as published by | |
21398 | + * the Free Software Foundation; either version 2 of the License, or | |
21399 | + * (at your option) any later version. | |
21400 | + * | |
21401 | + * This program is distributed in the hope that it will be useful, | |
21402 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21403 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21404 | + * GNU General Public License for more details. | |
21405 | + * | |
21406 | + * You should have received a copy of the GNU General Public License | |
21407 | + * along with this program; if not, write to the Free Software | |
21408 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
21409 | + */ | |
21410 | + | |
21411 | +/* | |
21412 | + * procfs interfaces | |
21413 | + */ | |
21414 | + | |
21415 | +#include <linux/proc_fs.h> | |
21416 | +#include "aufs.h" | |
21417 | + | |
21418 | +static int au_procfs_plm_release(struct inode *inode, struct file *file) | |
21419 | +{ | |
21420 | + struct au_sbinfo *sbinfo; | |
21421 | + | |
21422 | + sbinfo = file->private_data; | |
21423 | + if (sbinfo) { | |
21424 | + au_plink_maint_leave(sbinfo); | |
21425 | + kobject_put(&sbinfo->si_kobj); | |
21426 | + } | |
21427 | + | |
21428 | + return 0; | |
21429 | +} | |
21430 | + | |
21431 | +static void au_procfs_plm_write_clean(struct file *file) | |
21432 | +{ | |
21433 | + struct au_sbinfo *sbinfo; | |
21434 | + | |
21435 | + sbinfo = file->private_data; | |
21436 | + if (sbinfo) | |
21437 | + au_plink_clean(sbinfo->si_sb, /*verbose*/0); | |
21438 | +} | |
21439 | + | |
21440 | +static int au_procfs_plm_write_si(struct file *file, unsigned long id) | |
21441 | +{ | |
21442 | + int err; | |
21443 | + struct super_block *sb; | |
21444 | + struct au_sbinfo *sbinfo; | |
21445 | + | |
21446 | + err = -EBUSY; | |
21447 | + if (unlikely(file->private_data)) | |
21448 | + goto out; | |
21449 | + | |
21450 | + sb = NULL; | |
53392da6 | 21451 | + /* don't use au_sbilist_lock() here */ |
e49829fe JR |
21452 | + spin_lock(&au_sbilist.spin); |
21453 | + list_for_each_entry(sbinfo, &au_sbilist.head, si_list) | |
21454 | + if (id == sysaufs_si_id(sbinfo)) { | |
21455 | + kobject_get(&sbinfo->si_kobj); | |
21456 | + sb = sbinfo->si_sb; | |
21457 | + break; | |
21458 | + } | |
21459 | + spin_unlock(&au_sbilist.spin); | |
21460 | + | |
21461 | + err = -EINVAL; | |
21462 | + if (unlikely(!sb)) | |
21463 | + goto out; | |
21464 | + | |
21465 | + err = au_plink_maint_enter(sb); | |
21466 | + if (!err) | |
21467 | + /* keep kobject_get() */ | |
21468 | + file->private_data = sbinfo; | |
21469 | + else | |
21470 | + kobject_put(&sbinfo->si_kobj); | |
21471 | +out: | |
21472 | + return err; | |
21473 | +} | |
21474 | + | |
21475 | +/* | |
21476 | + * Accept a valid "si=xxxx" only. | |
21477 | + * Once it is accepted successfully, accept "clean" too. | |
21478 | + */ | |
21479 | +static ssize_t au_procfs_plm_write(struct file *file, const char __user *ubuf, | |
21480 | + size_t count, loff_t *ppos) | |
21481 | +{ | |
21482 | + ssize_t err; | |
21483 | + unsigned long id; | |
21484 | + /* last newline is allowed */ | |
21485 | + char buf[3 + sizeof(unsigned long) * 2 + 1]; | |
21486 | + | |
21487 | + err = -EACCES; | |
21488 | + if (unlikely(!capable(CAP_SYS_ADMIN))) | |
21489 | + goto out; | |
21490 | + | |
21491 | + err = -EINVAL; | |
21492 | + if (unlikely(count > sizeof(buf))) | |
21493 | + goto out; | |
21494 | + | |
21495 | + err = copy_from_user(buf, ubuf, count); | |
21496 | + if (unlikely(err)) { | |
21497 | + err = -EFAULT; | |
21498 | + goto out; | |
21499 | + } | |
21500 | + buf[count] = 0; | |
21501 | + | |
21502 | + err = -EINVAL; | |
21503 | + if (!strcmp("clean", buf)) { | |
21504 | + au_procfs_plm_write_clean(file); | |
21505 | + goto out_success; | |
21506 | + } else if (unlikely(strncmp("si=", buf, 3))) | |
21507 | + goto out; | |
21508 | + | |
21509 | + err = strict_strtoul(buf + 3, 16, &id); | |
21510 | + if (unlikely(err)) | |
21511 | + goto out; | |
21512 | + | |
21513 | + err = au_procfs_plm_write_si(file, id); | |
21514 | + if (unlikely(err)) | |
21515 | + goto out; | |
21516 | + | |
21517 | +out_success: | |
21518 | + err = count; /* success */ | |
21519 | +out: | |
21520 | + return err; | |
21521 | +} | |
21522 | + | |
21523 | +static const struct file_operations au_procfs_plm_fop = { | |
21524 | + .write = au_procfs_plm_write, | |
21525 | + .release = au_procfs_plm_release, | |
21526 | + .owner = THIS_MODULE | |
21527 | +}; | |
21528 | + | |
21529 | +/* ---------------------------------------------------------------------- */ | |
21530 | + | |
21531 | +static struct proc_dir_entry *au_procfs_dir; | |
21532 | + | |
21533 | +void au_procfs_fin(void) | |
21534 | +{ | |
21535 | + remove_proc_entry(AUFS_PLINK_MAINT_NAME, au_procfs_dir); | |
21536 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
21537 | +} | |
21538 | + | |
21539 | +int __init au_procfs_init(void) | |
21540 | +{ | |
21541 | + int err; | |
21542 | + struct proc_dir_entry *entry; | |
21543 | + | |
21544 | + err = -ENOMEM; | |
21545 | + au_procfs_dir = proc_mkdir(AUFS_PLINK_MAINT_DIR, NULL); | |
21546 | + if (unlikely(!au_procfs_dir)) | |
21547 | + goto out; | |
21548 | + | |
21549 | + entry = proc_create(AUFS_PLINK_MAINT_NAME, S_IFREG | S_IWUSR, | |
21550 | + au_procfs_dir, &au_procfs_plm_fop); | |
21551 | + if (unlikely(!entry)) | |
21552 | + goto out_dir; | |
21553 | + | |
21554 | + err = 0; | |
21555 | + goto out; /* success */ | |
21556 | + | |
21557 | + | |
21558 | +out_dir: | |
21559 | + remove_proc_entry(AUFS_PLINK_MAINT_DIR, NULL); | |
21560 | +out: | |
21561 | + return err; | |
21562 | +} | |
7f207e10 AM |
21563 | diff -urN /usr/share/empty/fs/aufs/rdu.c linux/fs/aufs/rdu.c |
21564 | --- /usr/share/empty/fs/aufs/rdu.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 21565 | +++ linux/fs/aufs/rdu.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 21566 | @@ -0,0 +1,383 @@ |
1308ab2a | 21567 | +/* |
027c5e7a | 21568 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1308ab2a | 21569 | + * |
21570 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21571 | + * it under the terms of the GNU General Public License as published by | |
21572 | + * the Free Software Foundation; either version 2 of the License, or | |
21573 | + * (at your option) any later version. | |
21574 | + * | |
21575 | + * This program is distributed in the hope that it will be useful, | |
21576 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21577 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21578 | + * GNU General Public License for more details. | |
21579 | + * | |
21580 | + * You should have received a copy of the GNU General Public License | |
21581 | + * along with this program; if not, write to the Free Software | |
21582 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
21583 | + */ | |
21584 | + | |
21585 | +/* | |
21586 | + * readdir in userspace. | |
21587 | + */ | |
21588 | + | |
b752ccd1 | 21589 | +#include <linux/compat.h> |
4a4d8108 | 21590 | +#include <linux/fs_stack.h> |
1308ab2a | 21591 | +#include <linux/security.h> |
21592 | +#include <linux/uaccess.h> | |
21593 | +#include <linux/aufs_type.h> | |
21594 | +#include "aufs.h" | |
21595 | + | |
21596 | +/* bits for struct aufs_rdu.flags */ | |
21597 | +#define AuRdu_CALLED 1 | |
21598 | +#define AuRdu_CONT (1 << 1) | |
21599 | +#define AuRdu_FULL (1 << 2) | |
21600 | +#define au_ftest_rdu(flags, name) ((flags) & AuRdu_##name) | |
7f207e10 AM |
21601 | +#define au_fset_rdu(flags, name) \ |
21602 | + do { (flags) |= AuRdu_##name; } while (0) | |
21603 | +#define au_fclr_rdu(flags, name) \ | |
21604 | + do { (flags) &= ~AuRdu_##name; } while (0) | |
1308ab2a | 21605 | + |
21606 | +struct au_rdu_arg { | |
21607 | + struct aufs_rdu *rdu; | |
21608 | + union au_rdu_ent_ul ent; | |
21609 | + unsigned long end; | |
21610 | + | |
21611 | + struct super_block *sb; | |
21612 | + int err; | |
21613 | +}; | |
21614 | + | |
21615 | +static int au_rdu_fill(void *__arg, const char *name, int nlen, | |
21616 | + loff_t offset, u64 h_ino, unsigned int d_type) | |
21617 | +{ | |
21618 | + int err, len; | |
21619 | + struct au_rdu_arg *arg = __arg; | |
21620 | + struct aufs_rdu *rdu = arg->rdu; | |
21621 | + struct au_rdu_ent ent; | |
21622 | + | |
21623 | + err = 0; | |
21624 | + arg->err = 0; | |
21625 | + au_fset_rdu(rdu->cookie.flags, CALLED); | |
21626 | + len = au_rdu_len(nlen); | |
21627 | + if (arg->ent.ul + len < arg->end) { | |
21628 | + ent.ino = h_ino; | |
21629 | + ent.bindex = rdu->cookie.bindex; | |
21630 | + ent.type = d_type; | |
21631 | + ent.nlen = nlen; | |
4a4d8108 AM |
21632 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) |
21633 | + ent.type = DT_UNKNOWN; | |
1308ab2a | 21634 | + |
21635 | + err = -EFAULT; | |
21636 | + if (copy_to_user(arg->ent.e, &ent, sizeof(ent))) | |
21637 | + goto out; | |
21638 | + if (copy_to_user(arg->ent.e->name, name, nlen)) | |
21639 | + goto out; | |
21640 | + /* the terminating NULL */ | |
21641 | + if (__put_user(0, arg->ent.e->name + nlen)) | |
21642 | + goto out; | |
21643 | + err = 0; | |
21644 | + /* AuDbg("%p, %.*s\n", arg->ent.p, nlen, name); */ | |
21645 | + arg->ent.ul += len; | |
21646 | + rdu->rent++; | |
21647 | + } else { | |
21648 | + err = -EFAULT; | |
21649 | + au_fset_rdu(rdu->cookie.flags, FULL); | |
21650 | + rdu->full = 1; | |
21651 | + rdu->tail = arg->ent; | |
21652 | + } | |
21653 | + | |
4f0767ce | 21654 | +out: |
1308ab2a | 21655 | + /* AuTraceErr(err); */ |
21656 | + return err; | |
21657 | +} | |
21658 | + | |
21659 | +static int au_rdu_do(struct file *h_file, struct au_rdu_arg *arg) | |
21660 | +{ | |
21661 | + int err; | |
21662 | + loff_t offset; | |
21663 | + struct au_rdu_cookie *cookie = &arg->rdu->cookie; | |
21664 | + | |
21665 | + offset = vfsub_llseek(h_file, cookie->h_pos, SEEK_SET); | |
21666 | + err = offset; | |
21667 | + if (unlikely(offset != cookie->h_pos)) | |
21668 | + goto out; | |
21669 | + | |
21670 | + err = 0; | |
21671 | + do { | |
21672 | + arg->err = 0; | |
21673 | + au_fclr_rdu(cookie->flags, CALLED); | |
21674 | + /* smp_mb(); */ | |
21675 | + err = vfsub_readdir(h_file, au_rdu_fill, arg); | |
21676 | + if (err >= 0) | |
21677 | + err = arg->err; | |
21678 | + } while (!err | |
21679 | + && au_ftest_rdu(cookie->flags, CALLED) | |
21680 | + && !au_ftest_rdu(cookie->flags, FULL)); | |
21681 | + cookie->h_pos = h_file->f_pos; | |
21682 | + | |
4f0767ce | 21683 | +out: |
1308ab2a | 21684 | + AuTraceErr(err); |
21685 | + return err; | |
21686 | +} | |
21687 | + | |
21688 | +static int au_rdu(struct file *file, struct aufs_rdu *rdu) | |
21689 | +{ | |
21690 | + int err; | |
21691 | + aufs_bindex_t bend; | |
21692 | + struct au_rdu_arg arg; | |
21693 | + struct dentry *dentry; | |
21694 | + struct inode *inode; | |
21695 | + struct file *h_file; | |
21696 | + struct au_rdu_cookie *cookie = &rdu->cookie; | |
21697 | + | |
21698 | + err = !access_ok(VERIFY_WRITE, rdu->ent.e, rdu->sz); | |
21699 | + if (unlikely(err)) { | |
21700 | + err = -EFAULT; | |
21701 | + AuTraceErr(err); | |
21702 | + goto out; | |
21703 | + } | |
21704 | + rdu->rent = 0; | |
21705 | + rdu->tail = rdu->ent; | |
21706 | + rdu->full = 0; | |
21707 | + arg.rdu = rdu; | |
21708 | + arg.ent = rdu->ent; | |
21709 | + arg.end = arg.ent.ul; | |
21710 | + arg.end += rdu->sz; | |
21711 | + | |
21712 | + err = -ENOTDIR; | |
21713 | + if (unlikely(!file->f_op || !file->f_op->readdir)) | |
21714 | + goto out; | |
21715 | + | |
21716 | + err = security_file_permission(file, MAY_READ); | |
21717 | + AuTraceErr(err); | |
21718 | + if (unlikely(err)) | |
21719 | + goto out; | |
21720 | + | |
21721 | + dentry = file->f_dentry; | |
21722 | + inode = dentry->d_inode; | |
21723 | +#if 1 | |
21724 | + mutex_lock(&inode->i_mutex); | |
21725 | +#else | |
21726 | + err = mutex_lock_killable(&inode->i_mutex); | |
21727 | + AuTraceErr(err); | |
21728 | + if (unlikely(err)) | |
21729 | + goto out; | |
21730 | +#endif | |
1308ab2a | 21731 | + |
21732 | + arg.sb = inode->i_sb; | |
e49829fe JR |
21733 | + err = si_read_lock(arg.sb, AuLock_FLUSH | AuLock_NOPLM); |
21734 | + if (unlikely(err)) | |
21735 | + goto out_mtx; | |
027c5e7a AM |
21736 | + err = au_alive_dir(dentry); |
21737 | + if (unlikely(err)) | |
21738 | + goto out_si; | |
e49829fe | 21739 | + /* todo: reval? */ |
1308ab2a | 21740 | + fi_read_lock(file); |
21741 | + | |
21742 | + err = -EAGAIN; | |
21743 | + if (unlikely(au_ftest_rdu(cookie->flags, CONT) | |
21744 | + && cookie->generation != au_figen(file))) | |
21745 | + goto out_unlock; | |
21746 | + | |
21747 | + err = 0; | |
21748 | + if (!rdu->blk) { | |
21749 | + rdu->blk = au_sbi(arg.sb)->si_rdblk; | |
21750 | + if (!rdu->blk) | |
21751 | + rdu->blk = au_dir_size(file, /*dentry*/NULL); | |
21752 | + } | |
21753 | + bend = au_fbstart(file); | |
21754 | + if (cookie->bindex < bend) | |
21755 | + cookie->bindex = bend; | |
4a4d8108 | 21756 | + bend = au_fbend_dir(file); |
1308ab2a | 21757 | + /* AuDbg("b%d, b%d\n", cookie->bindex, bend); */ |
21758 | + for (; !err && cookie->bindex <= bend; | |
21759 | + cookie->bindex++, cookie->h_pos = 0) { | |
4a4d8108 | 21760 | + h_file = au_hf_dir(file, cookie->bindex); |
1308ab2a | 21761 | + if (!h_file) |
21762 | + continue; | |
21763 | + | |
21764 | + au_fclr_rdu(cookie->flags, FULL); | |
21765 | + err = au_rdu_do(h_file, &arg); | |
21766 | + AuTraceErr(err); | |
21767 | + if (unlikely(au_ftest_rdu(cookie->flags, FULL) || err)) | |
21768 | + break; | |
21769 | + } | |
21770 | + AuDbg("rent %llu\n", rdu->rent); | |
21771 | + | |
21772 | + if (!err && !au_ftest_rdu(cookie->flags, CONT)) { | |
21773 | + rdu->shwh = !!au_opt_test(au_sbi(arg.sb)->si_mntflags, SHWH); | |
21774 | + au_fset_rdu(cookie->flags, CONT); | |
21775 | + cookie->generation = au_figen(file); | |
21776 | + } | |
21777 | + | |
21778 | + ii_read_lock_child(inode); | |
21779 | + fsstack_copy_attr_atime(inode, au_h_iptr(inode, au_ibstart(inode))); | |
21780 | + ii_read_unlock(inode); | |
21781 | + | |
4f0767ce | 21782 | +out_unlock: |
1308ab2a | 21783 | + fi_read_unlock(file); |
027c5e7a | 21784 | +out_si: |
1308ab2a | 21785 | + si_read_unlock(arg.sb); |
4f0767ce | 21786 | +out_mtx: |
1308ab2a | 21787 | + mutex_unlock(&inode->i_mutex); |
4f0767ce | 21788 | +out: |
1308ab2a | 21789 | + AuTraceErr(err); |
21790 | + return err; | |
21791 | +} | |
21792 | + | |
21793 | +static int au_rdu_ino(struct file *file, struct aufs_rdu *rdu) | |
21794 | +{ | |
21795 | + int err; | |
21796 | + ino_t ino; | |
21797 | + unsigned long long nent; | |
21798 | + union au_rdu_ent_ul *u; | |
21799 | + struct au_rdu_ent ent; | |
21800 | + struct super_block *sb; | |
21801 | + | |
21802 | + err = 0; | |
21803 | + nent = rdu->nent; | |
21804 | + u = &rdu->ent; | |
21805 | + sb = file->f_dentry->d_sb; | |
21806 | + si_read_lock(sb, AuLock_FLUSH); | |
21807 | + while (nent-- > 0) { | |
1308ab2a | 21808 | + err = copy_from_user(&ent, u->e, sizeof(ent)); |
4a4d8108 AM |
21809 | + if (!err) |
21810 | + err = !access_ok(VERIFY_WRITE, &u->e->ino, sizeof(ino)); | |
1308ab2a | 21811 | + if (unlikely(err)) { |
21812 | + err = -EFAULT; | |
21813 | + AuTraceErr(err); | |
21814 | + break; | |
21815 | + } | |
21816 | + | |
21817 | + /* AuDbg("b%d, i%llu\n", ent.bindex, ent.ino); */ | |
21818 | + if (!ent.wh) | |
21819 | + err = au_ino(sb, ent.bindex, ent.ino, ent.type, &ino); | |
21820 | + else | |
21821 | + err = au_wh_ino(sb, ent.bindex, ent.ino, ent.type, | |
21822 | + &ino); | |
21823 | + if (unlikely(err)) { | |
21824 | + AuTraceErr(err); | |
21825 | + break; | |
21826 | + } | |
21827 | + | |
21828 | + err = __put_user(ino, &u->e->ino); | |
21829 | + if (unlikely(err)) { | |
21830 | + err = -EFAULT; | |
21831 | + AuTraceErr(err); | |
21832 | + break; | |
21833 | + } | |
21834 | + u->ul += au_rdu_len(ent.nlen); | |
21835 | + } | |
21836 | + si_read_unlock(sb); | |
21837 | + | |
21838 | + return err; | |
21839 | +} | |
21840 | + | |
21841 | +/* ---------------------------------------------------------------------- */ | |
21842 | + | |
21843 | +static int au_rdu_verify(struct aufs_rdu *rdu) | |
21844 | +{ | |
b752ccd1 | 21845 | + AuDbg("rdu{%llu, %p, %u | %u | %llu, %u, %u | " |
1308ab2a | 21846 | + "%llu, b%d, 0x%x, g%u}\n", |
b752ccd1 | 21847 | + rdu->sz, rdu->ent.e, rdu->verify[AufsCtlRduV_SZ], |
1308ab2a | 21848 | + rdu->blk, |
21849 | + rdu->rent, rdu->shwh, rdu->full, | |
21850 | + rdu->cookie.h_pos, rdu->cookie.bindex, rdu->cookie.flags, | |
21851 | + rdu->cookie.generation); | |
dece6358 | 21852 | + |
b752ccd1 | 21853 | + if (rdu->verify[AufsCtlRduV_SZ] == sizeof(*rdu)) |
1308ab2a | 21854 | + return 0; |
dece6358 | 21855 | + |
b752ccd1 AM |
21856 | + AuDbg("%u:%u\n", |
21857 | + rdu->verify[AufsCtlRduV_SZ], (unsigned int)sizeof(*rdu)); | |
1308ab2a | 21858 | + return -EINVAL; |
21859 | +} | |
21860 | + | |
21861 | +long au_rdu_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
dece6358 | 21862 | +{ |
1308ab2a | 21863 | + long err, e; |
21864 | + struct aufs_rdu rdu; | |
21865 | + void __user *p = (void __user *)arg; | |
dece6358 | 21866 | + |
1308ab2a | 21867 | + err = copy_from_user(&rdu, p, sizeof(rdu)); |
21868 | + if (unlikely(err)) { | |
21869 | + err = -EFAULT; | |
21870 | + AuTraceErr(err); | |
21871 | + goto out; | |
21872 | + } | |
21873 | + err = au_rdu_verify(&rdu); | |
dece6358 AM |
21874 | + if (unlikely(err)) |
21875 | + goto out; | |
21876 | + | |
1308ab2a | 21877 | + switch (cmd) { |
21878 | + case AUFS_CTL_RDU: | |
21879 | + err = au_rdu(file, &rdu); | |
21880 | + if (unlikely(err)) | |
21881 | + break; | |
dece6358 | 21882 | + |
1308ab2a | 21883 | + e = copy_to_user(p, &rdu, sizeof(rdu)); |
21884 | + if (unlikely(e)) { | |
21885 | + err = -EFAULT; | |
21886 | + AuTraceErr(err); | |
21887 | + } | |
21888 | + break; | |
21889 | + case AUFS_CTL_RDU_INO: | |
21890 | + err = au_rdu_ino(file, &rdu); | |
21891 | + break; | |
21892 | + | |
21893 | + default: | |
4a4d8108 | 21894 | + /* err = -ENOTTY; */ |
1308ab2a | 21895 | + err = -EINVAL; |
21896 | + } | |
dece6358 | 21897 | + |
4f0767ce | 21898 | +out: |
1308ab2a | 21899 | + AuTraceErr(err); |
21900 | + return err; | |
1facf9fc | 21901 | +} |
b752ccd1 AM |
21902 | + |
21903 | +#ifdef CONFIG_COMPAT | |
21904 | +long au_rdu_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
21905 | +{ | |
21906 | + long err, e; | |
21907 | + struct aufs_rdu rdu; | |
21908 | + void __user *p = compat_ptr(arg); | |
21909 | + | |
21910 | + /* todo: get_user()? */ | |
21911 | + err = copy_from_user(&rdu, p, sizeof(rdu)); | |
21912 | + if (unlikely(err)) { | |
21913 | + err = -EFAULT; | |
21914 | + AuTraceErr(err); | |
21915 | + goto out; | |
21916 | + } | |
21917 | + rdu.ent.e = compat_ptr(rdu.ent.ul); | |
21918 | + err = au_rdu_verify(&rdu); | |
21919 | + if (unlikely(err)) | |
21920 | + goto out; | |
21921 | + | |
21922 | + switch (cmd) { | |
21923 | + case AUFS_CTL_RDU: | |
21924 | + err = au_rdu(file, &rdu); | |
21925 | + if (unlikely(err)) | |
21926 | + break; | |
21927 | + | |
21928 | + rdu.ent.ul = ptr_to_compat(rdu.ent.e); | |
21929 | + rdu.tail.ul = ptr_to_compat(rdu.tail.e); | |
21930 | + e = copy_to_user(p, &rdu, sizeof(rdu)); | |
21931 | + if (unlikely(e)) { | |
21932 | + err = -EFAULT; | |
21933 | + AuTraceErr(err); | |
21934 | + } | |
21935 | + break; | |
21936 | + case AUFS_CTL_RDU_INO: | |
21937 | + err = au_rdu_ino(file, &rdu); | |
21938 | + break; | |
21939 | + | |
21940 | + default: | |
21941 | + /* err = -ENOTTY; */ | |
21942 | + err = -EINVAL; | |
21943 | + } | |
21944 | + | |
4f0767ce | 21945 | +out: |
b752ccd1 AM |
21946 | + AuTraceErr(err); |
21947 | + return err; | |
21948 | +} | |
21949 | +#endif | |
7f207e10 AM |
21950 | diff -urN /usr/share/empty/fs/aufs/rwsem.h linux/fs/aufs/rwsem.h |
21951 | --- /usr/share/empty/fs/aufs/rwsem.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 21952 | +++ linux/fs/aufs/rwsem.h 2011-08-24 13:30:24.734646739 +0200 |
e49829fe | 21953 | @@ -0,0 +1,189 @@ |
1facf9fc | 21954 | +/* |
027c5e7a | 21955 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 21956 | + * |
21957 | + * This program, aufs is free software; you can redistribute it and/or modify | |
21958 | + * it under the terms of the GNU General Public License as published by | |
21959 | + * the Free Software Foundation; either version 2 of the License, or | |
21960 | + * (at your option) any later version. | |
dece6358 AM |
21961 | + * |
21962 | + * This program is distributed in the hope that it will be useful, | |
21963 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
21964 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
21965 | + * GNU General Public License for more details. | |
21966 | + * | |
21967 | + * You should have received a copy of the GNU General Public License | |
21968 | + * along with this program; if not, write to the Free Software | |
21969 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 21970 | + */ |
21971 | + | |
21972 | +/* | |
21973 | + * simple read-write semaphore wrappers | |
21974 | + */ | |
21975 | + | |
21976 | +#ifndef __AUFS_RWSEM_H__ | |
21977 | +#define __AUFS_RWSEM_H__ | |
21978 | + | |
21979 | +#ifdef __KERNEL__ | |
21980 | + | |
dece6358 | 21981 | +#include <linux/rwsem.h> |
4a4d8108 | 21982 | +#include "debug.h" |
dece6358 AM |
21983 | + |
21984 | +struct au_rwsem { | |
21985 | + struct rw_semaphore rwsem; | |
21986 | +#ifdef CONFIG_AUFS_DEBUG | |
21987 | + /* just for debugging, not almighty counter */ | |
21988 | + atomic_t rcnt, wcnt; | |
21989 | +#endif | |
21990 | +}; | |
21991 | + | |
21992 | +#ifdef CONFIG_AUFS_DEBUG | |
21993 | +#define AuDbgCntInit(rw) do { \ | |
21994 | + atomic_set(&(rw)->rcnt, 0); \ | |
21995 | + atomic_set(&(rw)->wcnt, 0); \ | |
21996 | + smp_mb(); /* atomic set */ \ | |
21997 | +} while (0) | |
21998 | + | |
e49829fe | 21999 | +#define AuDbgRcntInc(rw) atomic_inc(&(rw)->rcnt) |
dece6358 | 22000 | +#define AuDbgRcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->rcnt) < 0) |
e49829fe | 22001 | +#define AuDbgWcntInc(rw) atomic_inc(&(rw)->wcnt) |
dece6358 AM |
22002 | +#define AuDbgWcntDec(rw) WARN_ON(atomic_dec_return(&(rw)->wcnt) < 0) |
22003 | +#else | |
22004 | +#define AuDbgCntInit(rw) do {} while (0) | |
22005 | +#define AuDbgRcntInc(rw) do {} while (0) | |
22006 | +#define AuDbgRcntDec(rw) do {} while (0) | |
22007 | +#define AuDbgWcntInc(rw) do {} while (0) | |
22008 | +#define AuDbgWcntDec(rw) do {} while (0) | |
22009 | +#endif /* CONFIG_AUFS_DEBUG */ | |
22010 | + | |
22011 | +/* to debug easier, do not make them inlined functions */ | |
22012 | +#define AuRwMustNoWaiters(rw) AuDebugOn(!list_empty(&(rw)->rwsem.wait_list)) | |
22013 | +/* rwsem_is_locked() is unusable */ | |
22014 | +#define AuRwMustReadLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0) | |
22015 | +#define AuRwMustWriteLock(rw) AuDebugOn(atomic_read(&(rw)->wcnt) <= 0) | |
22016 | +#define AuRwMustAnyLock(rw) AuDebugOn(atomic_read(&(rw)->rcnt) <= 0 \ | |
22017 | + && atomic_read(&(rw)->wcnt) <= 0) | |
22018 | +#define AuRwDestroy(rw) AuDebugOn(atomic_read(&(rw)->rcnt) \ | |
22019 | + || atomic_read(&(rw)->wcnt)) | |
22020 | + | |
e49829fe JR |
22021 | +#define au_rw_class(rw, key) lockdep_set_class(&(rw)->rwsem, key) |
22022 | + | |
dece6358 AM |
22023 | +static inline void au_rw_init(struct au_rwsem *rw) |
22024 | +{ | |
22025 | + AuDbgCntInit(rw); | |
22026 | + init_rwsem(&rw->rwsem); | |
22027 | +} | |
22028 | + | |
22029 | +static inline void au_rw_init_wlock(struct au_rwsem *rw) | |
22030 | +{ | |
22031 | + au_rw_init(rw); | |
22032 | + down_write(&rw->rwsem); | |
22033 | + AuDbgWcntInc(rw); | |
22034 | +} | |
22035 | + | |
22036 | +static inline void au_rw_init_wlock_nested(struct au_rwsem *rw, | |
22037 | + unsigned int lsc) | |
22038 | +{ | |
22039 | + au_rw_init(rw); | |
22040 | + down_write_nested(&rw->rwsem, lsc); | |
22041 | + AuDbgWcntInc(rw); | |
22042 | +} | |
22043 | + | |
22044 | +static inline void au_rw_read_lock(struct au_rwsem *rw) | |
22045 | +{ | |
22046 | + down_read(&rw->rwsem); | |
22047 | + AuDbgRcntInc(rw); | |
22048 | +} | |
22049 | + | |
22050 | +static inline void au_rw_read_lock_nested(struct au_rwsem *rw, unsigned int lsc) | |
22051 | +{ | |
22052 | + down_read_nested(&rw->rwsem, lsc); | |
22053 | + AuDbgRcntInc(rw); | |
22054 | +} | |
22055 | + | |
22056 | +static inline void au_rw_read_unlock(struct au_rwsem *rw) | |
22057 | +{ | |
22058 | + AuRwMustReadLock(rw); | |
22059 | + AuDbgRcntDec(rw); | |
22060 | + up_read(&rw->rwsem); | |
22061 | +} | |
22062 | + | |
22063 | +static inline void au_rw_dgrade_lock(struct au_rwsem *rw) | |
22064 | +{ | |
22065 | + AuRwMustWriteLock(rw); | |
22066 | + AuDbgRcntInc(rw); | |
22067 | + AuDbgWcntDec(rw); | |
22068 | + downgrade_write(&rw->rwsem); | |
22069 | +} | |
22070 | + | |
22071 | +static inline void au_rw_write_lock(struct au_rwsem *rw) | |
22072 | +{ | |
22073 | + down_write(&rw->rwsem); | |
22074 | + AuDbgWcntInc(rw); | |
22075 | +} | |
22076 | + | |
22077 | +static inline void au_rw_write_lock_nested(struct au_rwsem *rw, | |
22078 | + unsigned int lsc) | |
22079 | +{ | |
22080 | + down_write_nested(&rw->rwsem, lsc); | |
22081 | + AuDbgWcntInc(rw); | |
22082 | +} | |
1facf9fc | 22083 | + |
dece6358 AM |
22084 | +static inline void au_rw_write_unlock(struct au_rwsem *rw) |
22085 | +{ | |
22086 | + AuRwMustWriteLock(rw); | |
22087 | + AuDbgWcntDec(rw); | |
22088 | + up_write(&rw->rwsem); | |
22089 | +} | |
22090 | + | |
22091 | +/* why is not _nested version defined */ | |
22092 | +static inline int au_rw_read_trylock(struct au_rwsem *rw) | |
22093 | +{ | |
22094 | + int ret = down_read_trylock(&rw->rwsem); | |
22095 | + if (ret) | |
22096 | + AuDbgRcntInc(rw); | |
22097 | + return ret; | |
22098 | +} | |
22099 | + | |
22100 | +static inline int au_rw_write_trylock(struct au_rwsem *rw) | |
22101 | +{ | |
22102 | + int ret = down_write_trylock(&rw->rwsem); | |
22103 | + if (ret) | |
22104 | + AuDbgWcntInc(rw); | |
22105 | + return ret; | |
22106 | +} | |
22107 | + | |
22108 | +#undef AuDbgCntInit | |
22109 | +#undef AuDbgRcntInc | |
22110 | +#undef AuDbgRcntDec | |
22111 | +#undef AuDbgWcntInc | |
22112 | +#undef AuDbgWcntDec | |
1facf9fc | 22113 | + |
22114 | +#define AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ | |
22115 | +static inline void prefix##_read_lock(param) \ | |
dece6358 | 22116 | +{ au_rw_read_lock(rwsem); } \ |
1facf9fc | 22117 | +static inline void prefix##_write_lock(param) \ |
dece6358 | 22118 | +{ au_rw_write_lock(rwsem); } \ |
1facf9fc | 22119 | +static inline int prefix##_read_trylock(param) \ |
dece6358 | 22120 | +{ return au_rw_read_trylock(rwsem); } \ |
1facf9fc | 22121 | +static inline int prefix##_write_trylock(param) \ |
dece6358 | 22122 | +{ return au_rw_write_trylock(rwsem); } |
1facf9fc | 22123 | +/* why is not _nested version defined */ |
22124 | +/* static inline void prefix##_read_trylock_nested(param, lsc) | |
dece6358 | 22125 | +{ au_rw_read_trylock_nested(rwsem, lsc)); } |
1facf9fc | 22126 | +static inline void prefix##_write_trylock_nestd(param, lsc) |
dece6358 | 22127 | +{ au_rw_write_trylock_nested(rwsem, lsc); } */ |
1facf9fc | 22128 | + |
22129 | +#define AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) \ | |
22130 | +static inline void prefix##_read_unlock(param) \ | |
dece6358 | 22131 | +{ au_rw_read_unlock(rwsem); } \ |
1facf9fc | 22132 | +static inline void prefix##_write_unlock(param) \ |
dece6358 | 22133 | +{ au_rw_write_unlock(rwsem); } \ |
1facf9fc | 22134 | +static inline void prefix##_downgrade_lock(param) \ |
dece6358 | 22135 | +{ au_rw_dgrade_lock(rwsem); } |
1facf9fc | 22136 | + |
22137 | +#define AuSimpleRwsemFuncs(prefix, param, rwsem) \ | |
22138 | + AuSimpleLockRwsemFuncs(prefix, param, rwsem) \ | |
22139 | + AuSimpleUnlockRwsemFuncs(prefix, param, rwsem) | |
22140 | + | |
22141 | +#endif /* __KERNEL__ */ | |
22142 | +#endif /* __AUFS_RWSEM_H__ */ | |
7f207e10 AM |
22143 | diff -urN /usr/share/empty/fs/aufs/sbinfo.c linux/fs/aufs/sbinfo.c |
22144 | --- /usr/share/empty/fs/aufs/sbinfo.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 22145 | +++ linux/fs/aufs/sbinfo.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 22146 | @@ -0,0 +1,344 @@ |
1facf9fc | 22147 | +/* |
027c5e7a | 22148 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 22149 | + * |
22150 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22151 | + * it under the terms of the GNU General Public License as published by | |
22152 | + * the Free Software Foundation; either version 2 of the License, or | |
22153 | + * (at your option) any later version. | |
dece6358 AM |
22154 | + * |
22155 | + * This program is distributed in the hope that it will be useful, | |
22156 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22157 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22158 | + * GNU General Public License for more details. | |
22159 | + * | |
22160 | + * You should have received a copy of the GNU General Public License | |
22161 | + * along with this program; if not, write to the Free Software | |
22162 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 22163 | + */ |
22164 | + | |
22165 | +/* | |
22166 | + * superblock private data | |
22167 | + */ | |
22168 | + | |
e49829fe | 22169 | +#include <linux/jiffies.h> |
1facf9fc | 22170 | +#include "aufs.h" |
22171 | + | |
22172 | +/* | |
22173 | + * they are necessary regardless sysfs is disabled. | |
22174 | + */ | |
22175 | +void au_si_free(struct kobject *kobj) | |
22176 | +{ | |
22177 | + struct au_sbinfo *sbinfo; | |
b752ccd1 | 22178 | + char *locked __maybe_unused; /* debug only */ |
1facf9fc | 22179 | + |
22180 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
22181 | + AuDebugOn(!list_empty(&sbinfo->si_plink.head)); | |
e49829fe | 22182 | + AuDebugOn(atomic_read(&sbinfo->si_nowait.nw_len)); |
1facf9fc | 22183 | + |
e49829fe | 22184 | + au_rw_write_lock(&sbinfo->si_rwsem); |
1facf9fc | 22185 | + au_br_free(sbinfo); |
e49829fe | 22186 | + au_rw_write_unlock(&sbinfo->si_rwsem); |
b752ccd1 AM |
22187 | + |
22188 | + AuDebugOn(radix_tree_gang_lookup | |
22189 | + (&sbinfo->au_si_pid.tree, (void **)&locked, | |
22190 | + /*first_index*/PID_MAX_DEFAULT - 1, | |
22191 | + /*max_items*/sizeof(locked)/sizeof(*locked))); | |
22192 | + | |
1facf9fc | 22193 | + kfree(sbinfo->si_branch); |
b752ccd1 | 22194 | + kfree(sbinfo->au_si_pid.bitmap); |
1facf9fc | 22195 | + mutex_destroy(&sbinfo->si_xib_mtx); |
dece6358 | 22196 | + AuRwDestroy(&sbinfo->si_rwsem); |
1facf9fc | 22197 | + |
22198 | + kfree(sbinfo); | |
22199 | +} | |
22200 | + | |
22201 | +int au_si_alloc(struct super_block *sb) | |
22202 | +{ | |
22203 | + int err; | |
22204 | + struct au_sbinfo *sbinfo; | |
e49829fe | 22205 | + static struct lock_class_key aufs_si; |
1facf9fc | 22206 | + |
22207 | + err = -ENOMEM; | |
4a4d8108 | 22208 | + sbinfo = kzalloc(sizeof(*sbinfo), GFP_NOFS); |
1facf9fc | 22209 | + if (unlikely(!sbinfo)) |
22210 | + goto out; | |
22211 | + | |
b752ccd1 AM |
22212 | + BUILD_BUG_ON(sizeof(unsigned long) != |
22213 | + sizeof(*sbinfo->au_si_pid.bitmap)); | |
22214 | + sbinfo->au_si_pid.bitmap = kcalloc(BITS_TO_LONGS(PID_MAX_DEFAULT), | |
22215 | + sizeof(*sbinfo->au_si_pid.bitmap), | |
22216 | + GFP_NOFS); | |
22217 | + if (unlikely(!sbinfo->au_si_pid.bitmap)) | |
22218 | + goto out_sbinfo; | |
22219 | + | |
1facf9fc | 22220 | + /* will be reallocated separately */ |
22221 | + sbinfo->si_branch = kzalloc(sizeof(*sbinfo->si_branch), GFP_NOFS); | |
22222 | + if (unlikely(!sbinfo->si_branch)) | |
b752ccd1 | 22223 | + goto out_pidmap; |
1facf9fc | 22224 | + |
1facf9fc | 22225 | + err = sysaufs_si_init(sbinfo); |
22226 | + if (unlikely(err)) | |
22227 | + goto out_br; | |
22228 | + | |
22229 | + au_nwt_init(&sbinfo->si_nowait); | |
dece6358 | 22230 | + au_rw_init_wlock(&sbinfo->si_rwsem); |
e49829fe | 22231 | + au_rw_class(&sbinfo->si_rwsem, &aufs_si); |
b752ccd1 AM |
22232 | + spin_lock_init(&sbinfo->au_si_pid.tree_lock); |
22233 | + INIT_RADIX_TREE(&sbinfo->au_si_pid.tree, GFP_ATOMIC | __GFP_NOFAIL); | |
22234 | + | |
7f207e10 | 22235 | + atomic_long_set(&sbinfo->si_ninodes, 0); |
7f207e10 AM |
22236 | + atomic_long_set(&sbinfo->si_nfiles, 0); |
22237 | + | |
1facf9fc | 22238 | + sbinfo->si_bend = -1; |
1facf9fc | 22239 | + |
22240 | + sbinfo->si_wbr_copyup = AuWbrCopyup_Def; | |
22241 | + sbinfo->si_wbr_create = AuWbrCreate_Def; | |
4a4d8108 AM |
22242 | + sbinfo->si_wbr_copyup_ops = au_wbr_copyup_ops + sbinfo->si_wbr_copyup; |
22243 | + sbinfo->si_wbr_create_ops = au_wbr_create_ops + sbinfo->si_wbr_create; | |
1facf9fc | 22244 | + |
e49829fe | 22245 | + sbinfo->si_mntflags = au_opts_plink(AuOpt_Def); |
1facf9fc | 22246 | + |
1facf9fc | 22247 | + mutex_init(&sbinfo->si_xib_mtx); |
1facf9fc | 22248 | + sbinfo->si_xino_brid = -1; |
22249 | + /* leave si_xib_last_pindex and si_xib_next_bit */ | |
22250 | + | |
e49829fe | 22251 | + sbinfo->si_rdcache = msecs_to_jiffies(AUFS_RDCACHE_DEF * MSEC_PER_SEC); |
1facf9fc | 22252 | + sbinfo->si_rdblk = AUFS_RDBLK_DEF; |
22253 | + sbinfo->si_rdhash = AUFS_RDHASH_DEF; | |
22254 | + sbinfo->si_dirwh = AUFS_DIRWH_DEF; | |
22255 | + | |
22256 | + au_spl_init(&sbinfo->si_plink); | |
22257 | + init_waitqueue_head(&sbinfo->si_plink_wq); | |
4a4d8108 | 22258 | + spin_lock_init(&sbinfo->si_plink_maint_lock); |
1facf9fc | 22259 | + |
22260 | + /* leave other members for sysaufs and si_mnt. */ | |
22261 | + sbinfo->si_sb = sb; | |
22262 | + sb->s_fs_info = sbinfo; | |
b752ccd1 | 22263 | + si_pid_set(sb); |
1facf9fc | 22264 | + au_debug_sbinfo_init(sbinfo); |
22265 | + return 0; /* success */ | |
22266 | + | |
4f0767ce | 22267 | +out_br: |
1facf9fc | 22268 | + kfree(sbinfo->si_branch); |
4f0767ce | 22269 | +out_pidmap: |
b752ccd1 | 22270 | + kfree(sbinfo->au_si_pid.bitmap); |
4f0767ce | 22271 | +out_sbinfo: |
1facf9fc | 22272 | + kfree(sbinfo); |
4f0767ce | 22273 | +out: |
1facf9fc | 22274 | + return err; |
22275 | +} | |
22276 | + | |
22277 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr) | |
22278 | +{ | |
22279 | + int err, sz; | |
22280 | + struct au_branch **brp; | |
22281 | + | |
dece6358 AM |
22282 | + AuRwMustWriteLock(&sbinfo->si_rwsem); |
22283 | + | |
1facf9fc | 22284 | + err = -ENOMEM; |
22285 | + sz = sizeof(*brp) * (sbinfo->si_bend + 1); | |
22286 | + if (unlikely(!sz)) | |
22287 | + sz = sizeof(*brp); | |
22288 | + brp = au_kzrealloc(sbinfo->si_branch, sz, sizeof(*brp) * nbr, GFP_NOFS); | |
22289 | + if (brp) { | |
22290 | + sbinfo->si_branch = brp; | |
22291 | + err = 0; | |
22292 | + } | |
22293 | + | |
22294 | + return err; | |
22295 | +} | |
22296 | + | |
22297 | +/* ---------------------------------------------------------------------- */ | |
22298 | + | |
22299 | +unsigned int au_sigen_inc(struct super_block *sb) | |
22300 | +{ | |
22301 | + unsigned int gen; | |
22302 | + | |
dece6358 AM |
22303 | + SiMustWriteLock(sb); |
22304 | + | |
1facf9fc | 22305 | + gen = ++au_sbi(sb)->si_generation; |
22306 | + au_update_digen(sb->s_root); | |
22307 | + au_update_iigen(sb->s_root->d_inode); | |
22308 | + sb->s_root->d_inode->i_version++; | |
22309 | + return gen; | |
22310 | +} | |
22311 | + | |
22312 | +aufs_bindex_t au_new_br_id(struct super_block *sb) | |
22313 | +{ | |
22314 | + aufs_bindex_t br_id; | |
22315 | + int i; | |
22316 | + struct au_sbinfo *sbinfo; | |
22317 | + | |
dece6358 AM |
22318 | + SiMustWriteLock(sb); |
22319 | + | |
1facf9fc | 22320 | + sbinfo = au_sbi(sb); |
22321 | + for (i = 0; i <= AUFS_BRANCH_MAX; i++) { | |
22322 | + br_id = ++sbinfo->si_last_br_id; | |
7f207e10 | 22323 | + AuDebugOn(br_id < 0); |
1facf9fc | 22324 | + if (br_id && au_br_index(sb, br_id) < 0) |
22325 | + return br_id; | |
22326 | + } | |
22327 | + | |
22328 | + return -1; | |
22329 | +} | |
22330 | + | |
22331 | +/* ---------------------------------------------------------------------- */ | |
22332 | + | |
e49829fe JR |
22333 | +/* it is ok that new 'nwt' tasks are appended while we are sleeping */ |
22334 | +int si_read_lock(struct super_block *sb, int flags) | |
22335 | +{ | |
22336 | + int err; | |
22337 | + | |
22338 | + err = 0; | |
22339 | + if (au_ftest_lock(flags, FLUSH)) | |
22340 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
22341 | + | |
22342 | + si_noflush_read_lock(sb); | |
22343 | + err = au_plink_maint(sb, flags); | |
22344 | + if (unlikely(err)) | |
22345 | + si_read_unlock(sb); | |
22346 | + | |
22347 | + return err; | |
22348 | +} | |
22349 | + | |
22350 | +int si_write_lock(struct super_block *sb, int flags) | |
22351 | +{ | |
22352 | + int err; | |
22353 | + | |
22354 | + if (au_ftest_lock(flags, FLUSH)) | |
22355 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
22356 | + | |
22357 | + si_noflush_write_lock(sb); | |
22358 | + err = au_plink_maint(sb, flags); | |
22359 | + if (unlikely(err)) | |
22360 | + si_write_unlock(sb); | |
22361 | + | |
22362 | + return err; | |
22363 | +} | |
22364 | + | |
1facf9fc | 22365 | +/* dentry and super_block lock. call at entry point */ |
e49829fe | 22366 | +int aufs_read_lock(struct dentry *dentry, int flags) |
1facf9fc | 22367 | +{ |
e49829fe | 22368 | + int err; |
027c5e7a | 22369 | + struct super_block *sb; |
e49829fe | 22370 | + |
027c5e7a AM |
22371 | + sb = dentry->d_sb; |
22372 | + err = si_read_lock(sb, flags); | |
22373 | + if (unlikely(err)) | |
22374 | + goto out; | |
22375 | + | |
22376 | + if (au_ftest_lock(flags, DW)) | |
22377 | + di_write_lock_child(dentry); | |
22378 | + else | |
22379 | + di_read_lock_child(dentry, flags); | |
22380 | + | |
22381 | + if (au_ftest_lock(flags, GEN)) { | |
22382 | + err = au_digen_test(dentry, au_sigen(sb)); | |
22383 | + AuDebugOn(!err && au_dbrange_test(dentry)); | |
22384 | + if (unlikely(err)) | |
22385 | + aufs_read_unlock(dentry, flags); | |
e49829fe JR |
22386 | + } |
22387 | + | |
027c5e7a | 22388 | +out: |
e49829fe | 22389 | + return err; |
1facf9fc | 22390 | +} |
22391 | + | |
22392 | +void aufs_read_unlock(struct dentry *dentry, int flags) | |
22393 | +{ | |
22394 | + if (au_ftest_lock(flags, DW)) | |
22395 | + di_write_unlock(dentry); | |
22396 | + else | |
22397 | + di_read_unlock(dentry, flags); | |
22398 | + si_read_unlock(dentry->d_sb); | |
22399 | +} | |
22400 | + | |
22401 | +void aufs_write_lock(struct dentry *dentry) | |
22402 | +{ | |
e49829fe | 22403 | + si_write_lock(dentry->d_sb, AuLock_FLUSH | AuLock_NOPLMW); |
1facf9fc | 22404 | + di_write_lock_child(dentry); |
22405 | +} | |
22406 | + | |
22407 | +void aufs_write_unlock(struct dentry *dentry) | |
22408 | +{ | |
22409 | + di_write_unlock(dentry); | |
22410 | + si_write_unlock(dentry->d_sb); | |
22411 | +} | |
22412 | + | |
e49829fe | 22413 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags) |
1facf9fc | 22414 | +{ |
e49829fe | 22415 | + int err; |
027c5e7a AM |
22416 | + unsigned int sigen; |
22417 | + struct super_block *sb; | |
e49829fe | 22418 | + |
027c5e7a AM |
22419 | + sb = d1->d_sb; |
22420 | + err = si_read_lock(sb, flags); | |
22421 | + if (unlikely(err)) | |
22422 | + goto out; | |
22423 | + | |
22424 | + di_write_lock2_child(d1, d2, au_ftest_lock(flags, DIR)); | |
22425 | + | |
22426 | + if (au_ftest_lock(flags, GEN)) { | |
22427 | + sigen = au_sigen(sb); | |
22428 | + err = au_digen_test(d1, sigen); | |
22429 | + AuDebugOn(!err && au_dbrange_test(d1)); | |
22430 | + if (!err) { | |
22431 | + err = au_digen_test(d2, sigen); | |
22432 | + AuDebugOn(!err && au_dbrange_test(d2)); | |
22433 | + } | |
22434 | + if (unlikely(err)) | |
22435 | + aufs_read_and_write_unlock2(d1, d2); | |
22436 | + } | |
22437 | + | |
22438 | +out: | |
e49829fe | 22439 | + return err; |
1facf9fc | 22440 | +} |
22441 | + | |
22442 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2) | |
22443 | +{ | |
22444 | + di_write_unlock2(d1, d2); | |
22445 | + si_read_unlock(d1->d_sb); | |
22446 | +} | |
b752ccd1 AM |
22447 | + |
22448 | +/* ---------------------------------------------------------------------- */ | |
22449 | + | |
22450 | +int si_pid_test_slow(struct super_block *sb) | |
22451 | +{ | |
22452 | + void *p; | |
22453 | + | |
22454 | + rcu_read_lock(); | |
22455 | + p = radix_tree_lookup(&au_sbi(sb)->au_si_pid.tree, current->pid); | |
22456 | + rcu_read_unlock(); | |
22457 | + | |
027c5e7a | 22458 | + return (long)!!p; |
b752ccd1 AM |
22459 | +} |
22460 | + | |
22461 | +void si_pid_set_slow(struct super_block *sb) | |
22462 | +{ | |
22463 | + int err; | |
22464 | + struct au_sbinfo *sbinfo; | |
22465 | + | |
22466 | + AuDebugOn(si_pid_test_slow(sb)); | |
22467 | + | |
22468 | + sbinfo = au_sbi(sb); | |
22469 | + err = radix_tree_preload(GFP_NOFS | __GFP_NOFAIL); | |
22470 | + AuDebugOn(err); | |
22471 | + spin_lock(&sbinfo->au_si_pid.tree_lock); | |
22472 | + err = radix_tree_insert(&sbinfo->au_si_pid.tree, current->pid, | |
027c5e7a | 22473 | + /*any valid ptr*/sb); |
b752ccd1 AM |
22474 | + spin_unlock(&sbinfo->au_si_pid.tree_lock); |
22475 | + AuDebugOn(err); | |
22476 | + radix_tree_preload_end(); | |
22477 | +} | |
22478 | + | |
22479 | +void si_pid_clr_slow(struct super_block *sb) | |
22480 | +{ | |
22481 | + void *p; | |
22482 | + struct au_sbinfo *sbinfo; | |
22483 | + | |
22484 | + AuDebugOn(!si_pid_test_slow(sb)); | |
22485 | + | |
22486 | + sbinfo = au_sbi(sb); | |
22487 | + spin_lock(&sbinfo->au_si_pid.tree_lock); | |
22488 | + p = radix_tree_delete(&sbinfo->au_si_pid.tree, current->pid); | |
22489 | + spin_unlock(&sbinfo->au_si_pid.tree_lock); | |
b752ccd1 | 22490 | +} |
7f207e10 AM |
22491 | diff -urN /usr/share/empty/fs/aufs/spl.h linux/fs/aufs/spl.h |
22492 | --- /usr/share/empty/fs/aufs/spl.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 22493 | +++ linux/fs/aufs/spl.h 2011-08-24 13:30:24.734646739 +0200 |
4a4d8108 | 22494 | @@ -0,0 +1,66 @@ |
1facf9fc | 22495 | +/* |
027c5e7a | 22496 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 22497 | + * |
22498 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22499 | + * it under the terms of the GNU General Public License as published by | |
22500 | + * the Free Software Foundation; either version 2 of the License, or | |
22501 | + * (at your option) any later version. | |
dece6358 AM |
22502 | + * |
22503 | + * This program is distributed in the hope that it will be useful, | |
22504 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22505 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22506 | + * GNU General Public License for more details. | |
22507 | + * | |
22508 | + * You should have received a copy of the GNU General Public License | |
22509 | + * along with this program; if not, write to the Free Software | |
22510 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 22511 | + */ |
22512 | + | |
22513 | +/* | |
22514 | + * simple list protected by a spinlock | |
22515 | + */ | |
22516 | + | |
22517 | +#ifndef __AUFS_SPL_H__ | |
22518 | +#define __AUFS_SPL_H__ | |
22519 | + | |
22520 | +#ifdef __KERNEL__ | |
22521 | + | |
dece6358 AM |
22522 | +#include <linux/spinlock.h> |
22523 | +#include <linux/list.h> | |
4a4d8108 | 22524 | +#include <linux/rculist.h> |
1facf9fc | 22525 | + |
22526 | +struct au_splhead { | |
22527 | + spinlock_t spin; | |
22528 | + struct list_head head; | |
22529 | +}; | |
22530 | + | |
22531 | +static inline void au_spl_init(struct au_splhead *spl) | |
22532 | +{ | |
22533 | + spin_lock_init(&spl->spin); | |
22534 | + INIT_LIST_HEAD(&spl->head); | |
22535 | +} | |
22536 | + | |
22537 | +static inline void au_spl_add(struct list_head *list, struct au_splhead *spl) | |
22538 | +{ | |
22539 | + spin_lock(&spl->spin); | |
22540 | + list_add(list, &spl->head); | |
22541 | + spin_unlock(&spl->spin); | |
22542 | +} | |
22543 | + | |
22544 | +static inline void au_spl_del(struct list_head *list, struct au_splhead *spl) | |
22545 | +{ | |
22546 | + spin_lock(&spl->spin); | |
22547 | + list_del(list); | |
22548 | + spin_unlock(&spl->spin); | |
22549 | +} | |
22550 | + | |
4a4d8108 AM |
22551 | +static inline void au_spl_del_rcu(struct list_head *list, |
22552 | + struct au_splhead *spl) | |
22553 | +{ | |
22554 | + spin_lock(&spl->spin); | |
22555 | + list_del_rcu(list); | |
22556 | + spin_unlock(&spl->spin); | |
22557 | +} | |
22558 | + | |
1facf9fc | 22559 | +#endif /* __KERNEL__ */ |
22560 | +#endif /* __AUFS_SPL_H__ */ | |
7f207e10 AM |
22561 | diff -urN /usr/share/empty/fs/aufs/super.c linux/fs/aufs/super.c |
22562 | --- /usr/share/empty/fs/aufs/super.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 22563 | +++ linux/fs/aufs/super.c 2011-08-24 13:30:24.734646739 +0200 |
2cbb1c4b | 22564 | @@ -0,0 +1,930 @@ |
1facf9fc | 22565 | +/* |
027c5e7a | 22566 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 22567 | + * |
22568 | + * This program, aufs is free software; you can redistribute it and/or modify | |
22569 | + * it under the terms of the GNU General Public License as published by | |
22570 | + * the Free Software Foundation; either version 2 of the License, or | |
22571 | + * (at your option) any later version. | |
dece6358 AM |
22572 | + * |
22573 | + * This program is distributed in the hope that it will be useful, | |
22574 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22575 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
22576 | + * GNU General Public License for more details. | |
22577 | + * | |
22578 | + * You should have received a copy of the GNU General Public License | |
22579 | + * along with this program; if not, write to the Free Software | |
22580 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 22581 | + */ |
22582 | + | |
22583 | +/* | |
22584 | + * mount and super_block operations | |
22585 | + */ | |
22586 | + | |
22587 | +#include <linux/buffer_head.h> | |
e49829fe | 22588 | +#include <linux/jiffies.h> |
dece6358 | 22589 | +#include <linux/module.h> |
1facf9fc | 22590 | +#include <linux/seq_file.h> |
22591 | +#include <linux/statfs.h> | |
7f207e10 AM |
22592 | +#include <linux/vmalloc.h> |
22593 | +#include <linux/writeback.h> | |
1facf9fc | 22594 | +#include "aufs.h" |
22595 | + | |
22596 | +/* | |
22597 | + * super_operations | |
22598 | + */ | |
22599 | +static struct inode *aufs_alloc_inode(struct super_block *sb __maybe_unused) | |
22600 | +{ | |
22601 | + struct au_icntnr *c; | |
22602 | + | |
22603 | + c = au_cache_alloc_icntnr(); | |
22604 | + if (c) { | |
027c5e7a | 22605 | + au_icntnr_init(c); |
1facf9fc | 22606 | + c->vfs_inode.i_version = 1; /* sigen(sb); */ |
22607 | + c->iinfo.ii_hinode = NULL; | |
22608 | + return &c->vfs_inode; | |
22609 | + } | |
22610 | + return NULL; | |
22611 | +} | |
22612 | + | |
027c5e7a AM |
22613 | +static void aufs_destroy_inode_cb(struct rcu_head *head) |
22614 | +{ | |
22615 | + struct inode *inode = container_of(head, struct inode, i_rcu); | |
22616 | + | |
22617 | + INIT_LIST_HEAD(&inode->i_dentry); | |
22618 | + au_cache_free_icntnr(container_of(inode, struct au_icntnr, vfs_inode)); | |
22619 | +} | |
22620 | + | |
1facf9fc | 22621 | +static void aufs_destroy_inode(struct inode *inode) |
22622 | +{ | |
22623 | + au_iinfo_fin(inode); | |
027c5e7a | 22624 | + call_rcu(&inode->i_rcu, aufs_destroy_inode_cb); |
1facf9fc | 22625 | +} |
22626 | + | |
22627 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino) | |
22628 | +{ | |
22629 | + struct inode *inode; | |
22630 | + int err; | |
22631 | + | |
22632 | + inode = iget_locked(sb, ino); | |
22633 | + if (unlikely(!inode)) { | |
22634 | + inode = ERR_PTR(-ENOMEM); | |
22635 | + goto out; | |
22636 | + } | |
22637 | + if (!(inode->i_state & I_NEW)) | |
22638 | + goto out; | |
22639 | + | |
22640 | + err = au_xigen_new(inode); | |
22641 | + if (!err) | |
22642 | + err = au_iinfo_init(inode); | |
22643 | + if (!err) | |
22644 | + inode->i_version++; | |
22645 | + else { | |
22646 | + iget_failed(inode); | |
22647 | + inode = ERR_PTR(err); | |
22648 | + } | |
22649 | + | |
4f0767ce | 22650 | +out: |
1facf9fc | 22651 | + /* never return NULL */ |
22652 | + AuDebugOn(!inode); | |
22653 | + AuTraceErrPtr(inode); | |
22654 | + return inode; | |
22655 | +} | |
22656 | + | |
22657 | +/* lock free root dinfo */ | |
22658 | +static int au_show_brs(struct seq_file *seq, struct super_block *sb) | |
22659 | +{ | |
22660 | + int err; | |
22661 | + aufs_bindex_t bindex, bend; | |
22662 | + struct path path; | |
4a4d8108 | 22663 | + struct au_hdentry *hdp; |
1facf9fc | 22664 | + struct au_branch *br; |
22665 | + | |
22666 | + err = 0; | |
22667 | + bend = au_sbend(sb); | |
4a4d8108 | 22668 | + hdp = au_di(sb->s_root)->di_hdentry; |
1facf9fc | 22669 | + for (bindex = 0; !err && bindex <= bend; bindex++) { |
22670 | + br = au_sbr(sb, bindex); | |
22671 | + path.mnt = br->br_mnt; | |
4a4d8108 | 22672 | + path.dentry = hdp[bindex].hd_dentry; |
1facf9fc | 22673 | + err = au_seq_path(seq, &path); |
22674 | + if (err > 0) | |
22675 | + err = seq_printf(seq, "=%s", | |
22676 | + au_optstr_br_perm(br->br_perm)); | |
22677 | + if (!err && bindex != bend) | |
22678 | + err = seq_putc(seq, ':'); | |
22679 | + } | |
22680 | + | |
22681 | + return err; | |
22682 | +} | |
22683 | + | |
22684 | +static void au_show_wbr_create(struct seq_file *m, int v, | |
22685 | + struct au_sbinfo *sbinfo) | |
22686 | +{ | |
22687 | + const char *pat; | |
22688 | + | |
dece6358 AM |
22689 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
22690 | + | |
1facf9fc | 22691 | + seq_printf(m, ",create="); |
22692 | + pat = au_optstr_wbr_create(v); | |
22693 | + switch (v) { | |
22694 | + case AuWbrCreate_TDP: | |
22695 | + case AuWbrCreate_RR: | |
22696 | + case AuWbrCreate_MFS: | |
22697 | + case AuWbrCreate_PMFS: | |
22698 | + seq_printf(m, pat); | |
22699 | + break; | |
22700 | + case AuWbrCreate_MFSV: | |
22701 | + seq_printf(m, /*pat*/"mfs:%lu", | |
e49829fe JR |
22702 | + jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire) |
22703 | + / MSEC_PER_SEC); | |
1facf9fc | 22704 | + break; |
22705 | + case AuWbrCreate_PMFSV: | |
22706 | + seq_printf(m, /*pat*/"pmfs:%lu", | |
e49829fe JR |
22707 | + jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire) |
22708 | + / MSEC_PER_SEC); | |
1facf9fc | 22709 | + break; |
22710 | + case AuWbrCreate_MFSRR: | |
22711 | + seq_printf(m, /*pat*/"mfsrr:%llu", | |
22712 | + sbinfo->si_wbr_mfs.mfsrr_watermark); | |
22713 | + break; | |
22714 | + case AuWbrCreate_MFSRRV: | |
22715 | + seq_printf(m, /*pat*/"mfsrr:%llu:%lu", | |
22716 | + sbinfo->si_wbr_mfs.mfsrr_watermark, | |
e49829fe JR |
22717 | + jiffies_to_msecs(sbinfo->si_wbr_mfs.mfs_expire) |
22718 | + / MSEC_PER_SEC); | |
1facf9fc | 22719 | + break; |
22720 | + } | |
22721 | +} | |
22722 | + | |
22723 | +static int au_show_xino(struct seq_file *seq, struct vfsmount *mnt) | |
22724 | +{ | |
22725 | +#ifdef CONFIG_SYSFS | |
22726 | + return 0; | |
22727 | +#else | |
22728 | + int err; | |
22729 | + const int len = sizeof(AUFS_XINO_FNAME) - 1; | |
22730 | + aufs_bindex_t bindex, brid; | |
22731 | + struct super_block *sb; | |
22732 | + struct qstr *name; | |
22733 | + struct file *f; | |
22734 | + struct dentry *d, *h_root; | |
4a4d8108 | 22735 | + struct au_hdentry *hdp; |
1facf9fc | 22736 | + |
dece6358 AM |
22737 | + AuRwMustAnyLock(&sbinfo->si_rwsem); |
22738 | + | |
1facf9fc | 22739 | + err = 0; |
22740 | + sb = mnt->mnt_sb; | |
22741 | + f = au_sbi(sb)->si_xib; | |
22742 | + if (!f) | |
22743 | + goto out; | |
22744 | + | |
22745 | + /* stop printing the default xino path on the first writable branch */ | |
22746 | + h_root = NULL; | |
22747 | + brid = au_xino_brid(sb); | |
22748 | + if (brid >= 0) { | |
22749 | + bindex = au_br_index(sb, brid); | |
4a4d8108 AM |
22750 | + hdp = au_di(sb->s_root)->di_hdentry; |
22751 | + h_root = hdp[0 + bindex].hd_dentry; | |
1facf9fc | 22752 | + } |
22753 | + d = f->f_dentry; | |
22754 | + name = &d->d_name; | |
22755 | + /* safe ->d_parent because the file is unlinked */ | |
22756 | + if (d->d_parent == h_root | |
22757 | + && name->len == len | |
22758 | + && !memcmp(name->name, AUFS_XINO_FNAME, len)) | |
22759 | + goto out; | |
22760 | + | |
22761 | + seq_puts(seq, ",xino="); | |
22762 | + err = au_xino_path(seq, f); | |
22763 | + | |
4f0767ce | 22764 | +out: |
1facf9fc | 22765 | + return err; |
22766 | +#endif | |
22767 | +} | |
22768 | + | |
22769 | +/* seq_file will re-call me in case of too long string */ | |
22770 | +static int aufs_show_options(struct seq_file *m, struct vfsmount *mnt) | |
22771 | +{ | |
027c5e7a | 22772 | + int err; |
1facf9fc | 22773 | + unsigned int mnt_flags, v; |
22774 | + struct super_block *sb; | |
22775 | + struct au_sbinfo *sbinfo; | |
22776 | + | |
22777 | +#define AuBool(name, str) do { \ | |
22778 | + v = au_opt_test(mnt_flags, name); \ | |
22779 | + if (v != au_opt_test(AuOpt_Def, name)) \ | |
22780 | + seq_printf(m, ",%s" #str, v ? "" : "no"); \ | |
22781 | +} while (0) | |
22782 | + | |
22783 | +#define AuStr(name, str) do { \ | |
22784 | + v = mnt_flags & AuOptMask_##name; \ | |
22785 | + if (v != (AuOpt_Def & AuOptMask_##name)) \ | |
22786 | + seq_printf(m, "," #str "=%s", au_optstr_##str(v)); \ | |
22787 | +} while (0) | |
22788 | + | |
22789 | +#define AuUInt(name, str, val) do { \ | |
22790 | + if (val != AUFS_##name##_DEF) \ | |
22791 | + seq_printf(m, "," #str "=%u", val); \ | |
22792 | +} while (0) | |
22793 | + | |
22794 | + /* lock free root dinfo */ | |
22795 | + sb = mnt->mnt_sb; | |
22796 | + si_noflush_read_lock(sb); | |
22797 | + sbinfo = au_sbi(sb); | |
22798 | + seq_printf(m, ",si=%lx", sysaufs_si_id(sbinfo)); | |
22799 | + | |
22800 | + mnt_flags = au_mntflags(sb); | |
22801 | + if (au_opt_test(mnt_flags, XINO)) { | |
22802 | + err = au_show_xino(m, mnt); | |
22803 | + if (unlikely(err)) | |
22804 | + goto out; | |
22805 | + } else | |
22806 | + seq_puts(m, ",noxino"); | |
22807 | + | |
22808 | + AuBool(TRUNC_XINO, trunc_xino); | |
22809 | + AuStr(UDBA, udba); | |
dece6358 | 22810 | + AuBool(SHWH, shwh); |
1facf9fc | 22811 | + AuBool(PLINK, plink); |
4a4d8108 | 22812 | + AuBool(DIO, dio); |
1facf9fc | 22813 | + /* AuBool(DIRPERM1, dirperm1); */ |
22814 | + /* AuBool(REFROF, refrof); */ | |
22815 | + | |
22816 | + v = sbinfo->si_wbr_create; | |
22817 | + if (v != AuWbrCreate_Def) | |
22818 | + au_show_wbr_create(m, v, sbinfo); | |
22819 | + | |
22820 | + v = sbinfo->si_wbr_copyup; | |
22821 | + if (v != AuWbrCopyup_Def) | |
22822 | + seq_printf(m, ",cpup=%s", au_optstr_wbr_copyup(v)); | |
22823 | + | |
22824 | + v = au_opt_test(mnt_flags, ALWAYS_DIROPQ); | |
22825 | + if (v != au_opt_test(AuOpt_Def, ALWAYS_DIROPQ)) | |
22826 | + seq_printf(m, ",diropq=%c", v ? 'a' : 'w'); | |
22827 | + | |
22828 | + AuUInt(DIRWH, dirwh, sbinfo->si_dirwh); | |
22829 | + | |
027c5e7a AM |
22830 | + v = jiffies_to_msecs(sbinfo->si_rdcache) / MSEC_PER_SEC; |
22831 | + AuUInt(RDCACHE, rdcache, v); | |
1facf9fc | 22832 | + |
22833 | + AuUInt(RDBLK, rdblk, sbinfo->si_rdblk); | |
22834 | + AuUInt(RDHASH, rdhash, sbinfo->si_rdhash); | |
22835 | + | |
22836 | + AuBool(SUM, sum); | |
22837 | + /* AuBool(SUM_W, wsum); */ | |
22838 | + AuBool(WARN_PERM, warn_perm); | |
22839 | + AuBool(VERBOSE, verbose); | |
22840 | + | |
4f0767ce | 22841 | +out: |
1facf9fc | 22842 | + /* be sure to print "br:" last */ |
22843 | + if (!sysaufs_brs) { | |
22844 | + seq_puts(m, ",br:"); | |
22845 | + au_show_brs(m, sb); | |
22846 | + } | |
22847 | + si_read_unlock(sb); | |
22848 | + return 0; | |
22849 | + | |
1facf9fc | 22850 | +#undef AuBool |
22851 | +#undef AuStr | |
4a4d8108 | 22852 | +#undef AuUInt |
1facf9fc | 22853 | +} |
22854 | + | |
22855 | +/* ---------------------------------------------------------------------- */ | |
22856 | + | |
22857 | +/* sum mode which returns the summation for statfs(2) */ | |
22858 | + | |
22859 | +static u64 au_add_till_max(u64 a, u64 b) | |
22860 | +{ | |
22861 | + u64 old; | |
22862 | + | |
22863 | + old = a; | |
22864 | + a += b; | |
22865 | + if (old < a) | |
22866 | + return a; | |
22867 | + return ULLONG_MAX; | |
22868 | +} | |
22869 | + | |
22870 | +static int au_statfs_sum(struct super_block *sb, struct kstatfs *buf) | |
22871 | +{ | |
22872 | + int err; | |
22873 | + u64 blocks, bfree, bavail, files, ffree; | |
22874 | + aufs_bindex_t bend, bindex, i; | |
22875 | + unsigned char shared; | |
7f207e10 | 22876 | + struct path h_path; |
1facf9fc | 22877 | + struct super_block *h_sb; |
22878 | + | |
22879 | + blocks = 0; | |
22880 | + bfree = 0; | |
22881 | + bavail = 0; | |
22882 | + files = 0; | |
22883 | + ffree = 0; | |
22884 | + | |
22885 | + err = 0; | |
22886 | + bend = au_sbend(sb); | |
22887 | + for (bindex = bend; bindex >= 0; bindex--) { | |
7f207e10 AM |
22888 | + h_path.mnt = au_sbr_mnt(sb, bindex); |
22889 | + h_sb = h_path.mnt->mnt_sb; | |
1facf9fc | 22890 | + shared = 0; |
22891 | + for (i = bindex + 1; !shared && i <= bend; i++) | |
22892 | + shared = (au_sbr_sb(sb, i) == h_sb); | |
22893 | + if (shared) | |
22894 | + continue; | |
22895 | + | |
22896 | + /* sb->s_root for NFS is unreliable */ | |
7f207e10 AM |
22897 | + h_path.dentry = h_path.mnt->mnt_root; |
22898 | + err = vfs_statfs(&h_path, buf); | |
1facf9fc | 22899 | + if (unlikely(err)) |
22900 | + goto out; | |
22901 | + | |
22902 | + blocks = au_add_till_max(blocks, buf->f_blocks); | |
22903 | + bfree = au_add_till_max(bfree, buf->f_bfree); | |
22904 | + bavail = au_add_till_max(bavail, buf->f_bavail); | |
22905 | + files = au_add_till_max(files, buf->f_files); | |
22906 | + ffree = au_add_till_max(ffree, buf->f_ffree); | |
22907 | + } | |
22908 | + | |
22909 | + buf->f_blocks = blocks; | |
22910 | + buf->f_bfree = bfree; | |
22911 | + buf->f_bavail = bavail; | |
22912 | + buf->f_files = files; | |
22913 | + buf->f_ffree = ffree; | |
22914 | + | |
4f0767ce | 22915 | +out: |
1facf9fc | 22916 | + return err; |
22917 | +} | |
22918 | + | |
22919 | +static int aufs_statfs(struct dentry *dentry, struct kstatfs *buf) | |
22920 | +{ | |
22921 | + int err; | |
7f207e10 | 22922 | + struct path h_path; |
1facf9fc | 22923 | + struct super_block *sb; |
22924 | + | |
22925 | + /* lock free root dinfo */ | |
22926 | + sb = dentry->d_sb; | |
22927 | + si_noflush_read_lock(sb); | |
7f207e10 | 22928 | + if (!au_opt_test(au_mntflags(sb), SUM)) { |
1facf9fc | 22929 | + /* sb->s_root for NFS is unreliable */ |
7f207e10 AM |
22930 | + h_path.mnt = au_sbr_mnt(sb, 0); |
22931 | + h_path.dentry = h_path.mnt->mnt_root; | |
22932 | + err = vfs_statfs(&h_path, buf); | |
22933 | + } else | |
1facf9fc | 22934 | + err = au_statfs_sum(sb, buf); |
22935 | + si_read_unlock(sb); | |
22936 | + | |
22937 | + if (!err) { | |
22938 | + buf->f_type = AUFS_SUPER_MAGIC; | |
4a4d8108 | 22939 | + buf->f_namelen = AUFS_MAX_NAMELEN; |
1facf9fc | 22940 | + memset(&buf->f_fsid, 0, sizeof(buf->f_fsid)); |
22941 | + } | |
22942 | + /* buf->f_bsize = buf->f_blocks = buf->f_bfree = buf->f_bavail = -1; */ | |
22943 | + | |
22944 | + return err; | |
22945 | +} | |
22946 | + | |
22947 | +/* ---------------------------------------------------------------------- */ | |
22948 | + | |
1facf9fc | 22949 | +/* final actions when unmounting a file system */ |
22950 | +static void aufs_put_super(struct super_block *sb) | |
22951 | +{ | |
22952 | + struct au_sbinfo *sbinfo; | |
22953 | + | |
22954 | + sbinfo = au_sbi(sb); | |
22955 | + if (!sbinfo) | |
22956 | + return; | |
22957 | + | |
1facf9fc | 22958 | + dbgaufs_si_fin(sbinfo); |
22959 | + kobject_put(&sbinfo->si_kobj); | |
22960 | +} | |
22961 | + | |
22962 | +/* ---------------------------------------------------------------------- */ | |
22963 | + | |
7f207e10 AM |
22964 | +void au_array_free(void *array) |
22965 | +{ | |
22966 | + if (array) { | |
22967 | + if (!is_vmalloc_addr(array)) | |
22968 | + kfree(array); | |
22969 | + else | |
22970 | + vfree(array); | |
22971 | + } | |
22972 | +} | |
22973 | + | |
22974 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg) | |
22975 | +{ | |
22976 | + void *array; | |
22977 | + unsigned long long n; | |
22978 | + | |
22979 | + array = NULL; | |
22980 | + n = 0; | |
22981 | + if (!*hint) | |
22982 | + goto out; | |
22983 | + | |
22984 | + if (*hint > ULLONG_MAX / sizeof(array)) { | |
22985 | + array = ERR_PTR(-EMFILE); | |
22986 | + pr_err("hint %llu\n", *hint); | |
22987 | + goto out; | |
22988 | + } | |
22989 | + | |
22990 | + array = kmalloc(sizeof(array) * *hint, GFP_NOFS); | |
22991 | + if (unlikely(!array)) | |
22992 | + array = vmalloc(sizeof(array) * *hint); | |
22993 | + if (unlikely(!array)) { | |
22994 | + array = ERR_PTR(-ENOMEM); | |
22995 | + goto out; | |
22996 | + } | |
22997 | + | |
22998 | + n = cb(array, *hint, arg); | |
22999 | + AuDebugOn(n > *hint); | |
23000 | + | |
23001 | +out: | |
23002 | + *hint = n; | |
23003 | + return array; | |
23004 | +} | |
23005 | + | |
23006 | +static unsigned long long au_iarray_cb(void *a, | |
23007 | + unsigned long long max __maybe_unused, | |
23008 | + void *arg) | |
23009 | +{ | |
23010 | + unsigned long long n; | |
23011 | + struct inode **p, *inode; | |
23012 | + struct list_head *head; | |
23013 | + | |
23014 | + n = 0; | |
23015 | + p = a; | |
23016 | + head = arg; | |
2cbb1c4b | 23017 | + spin_lock(&inode_sb_list_lock); |
7f207e10 AM |
23018 | + list_for_each_entry(inode, head, i_sb_list) { |
23019 | + if (!is_bad_inode(inode) | |
23020 | + && au_ii(inode)->ii_bstart >= 0) { | |
2cbb1c4b JR |
23021 | + spin_lock(&inode->i_lock); |
23022 | + if (atomic_read(&inode->i_count)) { | |
23023 | + au_igrab(inode); | |
23024 | + *p++ = inode; | |
23025 | + n++; | |
23026 | + AuDebugOn(n > max); | |
23027 | + } | |
23028 | + spin_unlock(&inode->i_lock); | |
7f207e10 AM |
23029 | + } |
23030 | + } | |
2cbb1c4b | 23031 | + spin_unlock(&inode_sb_list_lock); |
7f207e10 AM |
23032 | + |
23033 | + return n; | |
23034 | +} | |
23035 | + | |
23036 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max) | |
23037 | +{ | |
23038 | + *max = atomic_long_read(&au_sbi(sb)->si_ninodes); | |
23039 | + return au_array_alloc(max, au_iarray_cb, &sb->s_inodes); | |
23040 | +} | |
23041 | + | |
23042 | +void au_iarray_free(struct inode **a, unsigned long long max) | |
23043 | +{ | |
23044 | + unsigned long long ull; | |
23045 | + | |
23046 | + for (ull = 0; ull < max; ull++) | |
23047 | + iput(a[ull]); | |
23048 | + au_array_free(a); | |
23049 | +} | |
23050 | + | |
23051 | +/* ---------------------------------------------------------------------- */ | |
23052 | + | |
1facf9fc | 23053 | +/* |
23054 | + * refresh dentry and inode at remount time. | |
23055 | + */ | |
027c5e7a AM |
23056 | +/* todo: consolidate with simple_reval_dpath() and au_reval_for_attr() */ |
23057 | +static int au_do_refresh(struct dentry *dentry, unsigned int dir_flags, | |
23058 | + struct dentry *parent) | |
1facf9fc | 23059 | +{ |
23060 | + int err; | |
1facf9fc | 23061 | + |
23062 | + di_write_lock_child(dentry); | |
1facf9fc | 23063 | + di_read_lock_parent(parent, AuLock_IR); |
027c5e7a AM |
23064 | + err = au_refresh_dentry(dentry, parent); |
23065 | + if (!err && dir_flags) | |
23066 | + au_hn_reset(dentry->d_inode, dir_flags); | |
1facf9fc | 23067 | + di_read_unlock(parent, AuLock_IR); |
1facf9fc | 23068 | + di_write_unlock(dentry); |
23069 | + | |
23070 | + return err; | |
23071 | +} | |
23072 | + | |
027c5e7a AM |
23073 | +static int au_do_refresh_d(struct dentry *dentry, unsigned int sigen, |
23074 | + struct au_sbinfo *sbinfo, | |
23075 | + const unsigned int dir_flags) | |
1facf9fc | 23076 | +{ |
027c5e7a AM |
23077 | + int err; |
23078 | + struct dentry *parent; | |
23079 | + struct inode *inode; | |
23080 | + | |
23081 | + err = 0; | |
23082 | + parent = dget_parent(dentry); | |
23083 | + if (!au_digen_test(parent, sigen) && au_digen_test(dentry, sigen)) { | |
23084 | + inode = dentry->d_inode; | |
23085 | + if (inode) { | |
23086 | + if (!S_ISDIR(inode->i_mode)) | |
23087 | + err = au_do_refresh(dentry, /*dir_flags*/0, | |
23088 | + parent); | |
23089 | + else { | |
23090 | + err = au_do_refresh(dentry, dir_flags, parent); | |
23091 | + if (unlikely(err)) | |
23092 | + au_fset_si(sbinfo, FAILED_REFRESH_DIR); | |
23093 | + } | |
23094 | + } else | |
23095 | + err = au_do_refresh(dentry, /*dir_flags*/0, parent); | |
23096 | + AuDbgDentry(dentry); | |
23097 | + } | |
23098 | + dput(parent); | |
23099 | + | |
23100 | + AuTraceErr(err); | |
23101 | + return err; | |
1facf9fc | 23102 | +} |
23103 | + | |
027c5e7a | 23104 | +static int au_refresh_d(struct super_block *sb) |
1facf9fc | 23105 | +{ |
23106 | + int err, i, j, ndentry, e; | |
027c5e7a | 23107 | + unsigned int sigen; |
1facf9fc | 23108 | + struct au_dcsub_pages dpages; |
23109 | + struct au_dpage *dpage; | |
027c5e7a AM |
23110 | + struct dentry **dentries, *d; |
23111 | + struct au_sbinfo *sbinfo; | |
23112 | + struct dentry *root = sb->s_root; | |
23113 | + const unsigned int dir_flags = au_hi_flags(root->d_inode, /*isdir*/1); | |
1facf9fc | 23114 | + |
027c5e7a AM |
23115 | + err = au_dpages_init(&dpages, GFP_NOFS); |
23116 | + if (unlikely(err)) | |
1facf9fc | 23117 | + goto out; |
027c5e7a AM |
23118 | + err = au_dcsub_pages(&dpages, root, NULL, NULL); |
23119 | + if (unlikely(err)) | |
1facf9fc | 23120 | + goto out_dpages; |
1facf9fc | 23121 | + |
027c5e7a AM |
23122 | + sigen = au_sigen(sb); |
23123 | + sbinfo = au_sbi(sb); | |
23124 | + for (i = 0; i < dpages.ndpage; i++) { | |
1facf9fc | 23125 | + dpage = dpages.dpages + i; |
23126 | + dentries = dpage->dentries; | |
23127 | + ndentry = dpage->ndentry; | |
027c5e7a | 23128 | + for (j = 0; j < ndentry; j++) { |
1facf9fc | 23129 | + d = dentries[j]; |
027c5e7a AM |
23130 | + e = au_do_refresh_d(d, sigen, sbinfo, dir_flags); |
23131 | + if (unlikely(e && !err)) | |
23132 | + err = e; | |
23133 | + /* go on even err */ | |
1facf9fc | 23134 | + } |
23135 | + } | |
23136 | + | |
4f0767ce | 23137 | +out_dpages: |
1facf9fc | 23138 | + au_dpages_free(&dpages); |
4f0767ce | 23139 | +out: |
1facf9fc | 23140 | + return err; |
23141 | +} | |
23142 | + | |
027c5e7a | 23143 | +static int au_refresh_i(struct super_block *sb) |
1facf9fc | 23144 | +{ |
027c5e7a AM |
23145 | + int err, e; |
23146 | + unsigned int sigen; | |
23147 | + unsigned long long max, ull; | |
23148 | + struct inode *inode, **array; | |
1facf9fc | 23149 | + |
027c5e7a AM |
23150 | + array = au_iarray_alloc(sb, &max); |
23151 | + err = PTR_ERR(array); | |
23152 | + if (IS_ERR(array)) | |
23153 | + goto out; | |
1facf9fc | 23154 | + |
23155 | + err = 0; | |
027c5e7a AM |
23156 | + sigen = au_sigen(sb); |
23157 | + for (ull = 0; ull < max; ull++) { | |
23158 | + inode = array[ull]; | |
23159 | + if (au_iigen(inode) != sigen) { | |
1facf9fc | 23160 | + ii_write_lock_child(inode); |
027c5e7a | 23161 | + e = au_refresh_hinode_self(inode); |
1facf9fc | 23162 | + ii_write_unlock(inode); |
23163 | + if (unlikely(e)) { | |
027c5e7a | 23164 | + pr_err("error %d, i%lu\n", e, inode->i_ino); |
1facf9fc | 23165 | + if (!err) |
23166 | + err = e; | |
23167 | + /* go on even if err */ | |
23168 | + } | |
23169 | + } | |
1facf9fc | 23170 | + } |
23171 | + | |
027c5e7a | 23172 | + au_iarray_free(array, max); |
1facf9fc | 23173 | + |
4f0767ce | 23174 | +out: |
1facf9fc | 23175 | + return err; |
23176 | +} | |
23177 | + | |
027c5e7a | 23178 | +static void au_remount_refresh(struct super_block *sb) |
1facf9fc | 23179 | +{ |
027c5e7a AM |
23180 | + int err, e; |
23181 | + unsigned int udba; | |
23182 | + aufs_bindex_t bindex, bend; | |
1facf9fc | 23183 | + struct dentry *root; |
23184 | + struct inode *inode; | |
027c5e7a | 23185 | + struct au_branch *br; |
1facf9fc | 23186 | + |
23187 | + au_sigen_inc(sb); | |
027c5e7a | 23188 | + au_fclr_si(au_sbi(sb), FAILED_REFRESH_DIR); |
1facf9fc | 23189 | + |
23190 | + root = sb->s_root; | |
23191 | + DiMustNoWaiters(root); | |
23192 | + inode = root->d_inode; | |
23193 | + IiMustNoWaiters(inode); | |
1facf9fc | 23194 | + |
027c5e7a AM |
23195 | + udba = au_opt_udba(sb); |
23196 | + bend = au_sbend(sb); | |
23197 | + for (bindex = 0; bindex <= bend; bindex++) { | |
23198 | + br = au_sbr(sb, bindex); | |
23199 | + err = au_hnotify_reset_br(udba, br, br->br_perm); | |
1facf9fc | 23200 | + if (unlikely(err)) |
027c5e7a AM |
23201 | + AuIOErr("hnotify failed on br %d, %d, ignored\n", |
23202 | + bindex, err); | |
23203 | + /* go on even if err */ | |
1facf9fc | 23204 | + } |
027c5e7a | 23205 | + au_hn_reset(inode, au_hi_flags(inode, /*isdir*/1)); |
1facf9fc | 23206 | + |
027c5e7a AM |
23207 | + di_write_unlock(root); |
23208 | + err = au_refresh_d(sb); | |
23209 | + e = au_refresh_i(sb); | |
23210 | + if (unlikely(e && !err)) | |
23211 | + err = e; | |
1facf9fc | 23212 | + /* aufs_write_lock() calls ..._child() */ |
23213 | + di_write_lock_child(root); | |
027c5e7a AM |
23214 | + |
23215 | + au_cpup_attr_all(inode, /*force*/1); | |
23216 | + | |
23217 | + if (unlikely(err)) | |
23218 | + AuIOErr("refresh failed, ignored, %d\n", err); | |
1facf9fc | 23219 | +} |
23220 | + | |
23221 | +/* stop extra interpretation of errno in mount(8), and strange error messages */ | |
23222 | +static int cvt_err(int err) | |
23223 | +{ | |
23224 | + AuTraceErr(err); | |
23225 | + | |
23226 | + switch (err) { | |
23227 | + case -ENOENT: | |
23228 | + case -ENOTDIR: | |
23229 | + case -EEXIST: | |
23230 | + case -EIO: | |
23231 | + err = -EINVAL; | |
23232 | + } | |
23233 | + return err; | |
23234 | +} | |
23235 | + | |
23236 | +static int aufs_remount_fs(struct super_block *sb, int *flags, char *data) | |
23237 | +{ | |
4a4d8108 AM |
23238 | + int err, do_dx; |
23239 | + unsigned int mntflags; | |
1facf9fc | 23240 | + struct au_opts opts; |
23241 | + struct dentry *root; | |
23242 | + struct inode *inode; | |
23243 | + struct au_sbinfo *sbinfo; | |
23244 | + | |
23245 | + err = 0; | |
23246 | + root = sb->s_root; | |
23247 | + if (!data || !*data) { | |
e49829fe JR |
23248 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
23249 | + if (!err) { | |
23250 | + di_write_lock_child(root); | |
23251 | + err = au_opts_verify(sb, *flags, /*pending*/0); | |
23252 | + aufs_write_unlock(root); | |
23253 | + } | |
1facf9fc | 23254 | + goto out; |
23255 | + } | |
23256 | + | |
23257 | + err = -ENOMEM; | |
23258 | + memset(&opts, 0, sizeof(opts)); | |
23259 | + opts.opt = (void *)__get_free_page(GFP_NOFS); | |
23260 | + if (unlikely(!opts.opt)) | |
23261 | + goto out; | |
23262 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
23263 | + opts.flags = AuOpts_REMOUNT; | |
23264 | + opts.sb_flags = *flags; | |
23265 | + | |
23266 | + /* parse it before aufs lock */ | |
23267 | + err = au_opts_parse(sb, data, &opts); | |
23268 | + if (unlikely(err)) | |
23269 | + goto out_opts; | |
23270 | + | |
23271 | + sbinfo = au_sbi(sb); | |
23272 | + inode = root->d_inode; | |
23273 | + mutex_lock(&inode->i_mutex); | |
e49829fe JR |
23274 | + err = si_write_lock(sb, AuLock_FLUSH | AuLock_NOPLM); |
23275 | + if (unlikely(err)) | |
23276 | + goto out_mtx; | |
23277 | + di_write_lock_child(root); | |
1facf9fc | 23278 | + |
23279 | + /* au_opts_remount() may return an error */ | |
23280 | + err = au_opts_remount(sb, &opts); | |
23281 | + au_opts_free(&opts); | |
23282 | + | |
027c5e7a AM |
23283 | + if (au_ftest_opts(opts.flags, REFRESH)) |
23284 | + au_remount_refresh(sb); | |
1facf9fc | 23285 | + |
4a4d8108 AM |
23286 | + if (au_ftest_opts(opts.flags, REFRESH_DYAOP)) { |
23287 | + mntflags = au_mntflags(sb); | |
23288 | + do_dx = !!au_opt_test(mntflags, DIO); | |
23289 | + au_dy_arefresh(do_dx); | |
23290 | + } | |
23291 | + | |
1facf9fc | 23292 | + aufs_write_unlock(root); |
953406b4 | 23293 | + |
e49829fe JR |
23294 | +out_mtx: |
23295 | + mutex_unlock(&inode->i_mutex); | |
4f0767ce | 23296 | +out_opts: |
1facf9fc | 23297 | + free_page((unsigned long)opts.opt); |
4f0767ce | 23298 | +out: |
1facf9fc | 23299 | + err = cvt_err(err); |
23300 | + AuTraceErr(err); | |
23301 | + return err; | |
23302 | +} | |
23303 | + | |
4a4d8108 | 23304 | +static const struct super_operations aufs_sop = { |
1facf9fc | 23305 | + .alloc_inode = aufs_alloc_inode, |
23306 | + .destroy_inode = aufs_destroy_inode, | |
b752ccd1 | 23307 | + /* always deleting, no clearing */ |
1facf9fc | 23308 | + .drop_inode = generic_delete_inode, |
23309 | + .show_options = aufs_show_options, | |
23310 | + .statfs = aufs_statfs, | |
23311 | + .put_super = aufs_put_super, | |
23312 | + .remount_fs = aufs_remount_fs | |
23313 | +}; | |
23314 | + | |
23315 | +/* ---------------------------------------------------------------------- */ | |
23316 | + | |
23317 | +static int alloc_root(struct super_block *sb) | |
23318 | +{ | |
23319 | + int err; | |
23320 | + struct inode *inode; | |
23321 | + struct dentry *root; | |
23322 | + | |
23323 | + err = -ENOMEM; | |
23324 | + inode = au_iget_locked(sb, AUFS_ROOT_INO); | |
23325 | + err = PTR_ERR(inode); | |
23326 | + if (IS_ERR(inode)) | |
23327 | + goto out; | |
23328 | + | |
23329 | + inode->i_op = &aufs_dir_iop; | |
23330 | + inode->i_fop = &aufs_dir_fop; | |
23331 | + inode->i_mode = S_IFDIR; | |
23332 | + inode->i_nlink = 2; | |
23333 | + unlock_new_inode(inode); | |
23334 | + | |
23335 | + root = d_alloc_root(inode); | |
23336 | + if (unlikely(!root)) | |
23337 | + goto out_iput; | |
23338 | + err = PTR_ERR(root); | |
23339 | + if (IS_ERR(root)) | |
23340 | + goto out_iput; | |
23341 | + | |
4a4d8108 | 23342 | + err = au_di_init(root); |
1facf9fc | 23343 | + if (!err) { |
23344 | + sb->s_root = root; | |
23345 | + return 0; /* success */ | |
23346 | + } | |
23347 | + dput(root); | |
23348 | + goto out; /* do not iput */ | |
23349 | + | |
4f0767ce | 23350 | +out_iput: |
1facf9fc | 23351 | + iget_failed(inode); |
4f0767ce | 23352 | +out: |
1facf9fc | 23353 | + return err; |
23354 | + | |
23355 | +} | |
23356 | + | |
23357 | +static int aufs_fill_super(struct super_block *sb, void *raw_data, | |
23358 | + int silent __maybe_unused) | |
23359 | +{ | |
23360 | + int err; | |
23361 | + struct au_opts opts; | |
23362 | + struct dentry *root; | |
23363 | + struct inode *inode; | |
23364 | + char *arg = raw_data; | |
23365 | + | |
23366 | + if (unlikely(!arg || !*arg)) { | |
23367 | + err = -EINVAL; | |
4a4d8108 | 23368 | + pr_err("no arg\n"); |
1facf9fc | 23369 | + goto out; |
23370 | + } | |
23371 | + | |
23372 | + err = -ENOMEM; | |
23373 | + memset(&opts, 0, sizeof(opts)); | |
23374 | + opts.opt = (void *)__get_free_page(GFP_NOFS); | |
23375 | + if (unlikely(!opts.opt)) | |
23376 | + goto out; | |
23377 | + opts.max_opt = PAGE_SIZE / sizeof(*opts.opt); | |
23378 | + opts.sb_flags = sb->s_flags; | |
23379 | + | |
23380 | + err = au_si_alloc(sb); | |
23381 | + if (unlikely(err)) | |
23382 | + goto out_opts; | |
23383 | + | |
23384 | + /* all timestamps always follow the ones on the branch */ | |
23385 | + sb->s_flags |= MS_NOATIME | MS_NODIRATIME; | |
23386 | + sb->s_op = &aufs_sop; | |
027c5e7a | 23387 | + sb->s_d_op = &aufs_dop; |
1facf9fc | 23388 | + sb->s_magic = AUFS_SUPER_MAGIC; |
23389 | + sb->s_maxbytes = 0; | |
23390 | + au_export_init(sb); | |
23391 | + | |
23392 | + err = alloc_root(sb); | |
23393 | + if (unlikely(err)) { | |
23394 | + si_write_unlock(sb); | |
23395 | + goto out_info; | |
23396 | + } | |
23397 | + root = sb->s_root; | |
23398 | + inode = root->d_inode; | |
23399 | + | |
23400 | + /* | |
23401 | + * actually we can parse options regardless aufs lock here. | |
23402 | + * but at remount time, parsing must be done before aufs lock. | |
23403 | + * so we follow the same rule. | |
23404 | + */ | |
23405 | + ii_write_lock_parent(inode); | |
23406 | + aufs_write_unlock(root); | |
23407 | + err = au_opts_parse(sb, arg, &opts); | |
23408 | + if (unlikely(err)) | |
23409 | + goto out_root; | |
23410 | + | |
23411 | + /* lock vfs_inode first, then aufs. */ | |
23412 | + mutex_lock(&inode->i_mutex); | |
1facf9fc | 23413 | + aufs_write_lock(root); |
23414 | + err = au_opts_mount(sb, &opts); | |
23415 | + au_opts_free(&opts); | |
1facf9fc | 23416 | + aufs_write_unlock(root); |
23417 | + mutex_unlock(&inode->i_mutex); | |
4a4d8108 AM |
23418 | + if (!err) |
23419 | + goto out_opts; /* success */ | |
1facf9fc | 23420 | + |
4f0767ce | 23421 | +out_root: |
1facf9fc | 23422 | + dput(root); |
23423 | + sb->s_root = NULL; | |
4f0767ce | 23424 | +out_info: |
2cbb1c4b | 23425 | + dbgaufs_si_fin(au_sbi(sb)); |
1facf9fc | 23426 | + kobject_put(&au_sbi(sb)->si_kobj); |
23427 | + sb->s_fs_info = NULL; | |
4f0767ce | 23428 | +out_opts: |
1facf9fc | 23429 | + free_page((unsigned long)opts.opt); |
4f0767ce | 23430 | +out: |
1facf9fc | 23431 | + AuTraceErr(err); |
23432 | + err = cvt_err(err); | |
23433 | + AuTraceErr(err); | |
23434 | + return err; | |
23435 | +} | |
23436 | + | |
23437 | +/* ---------------------------------------------------------------------- */ | |
23438 | + | |
027c5e7a AM |
23439 | +static struct dentry *aufs_mount(struct file_system_type *fs_type, int flags, |
23440 | + const char *dev_name __maybe_unused, | |
23441 | + void *raw_data) | |
1facf9fc | 23442 | +{ |
027c5e7a | 23443 | + struct dentry *root; |
1facf9fc | 23444 | + struct super_block *sb; |
23445 | + | |
23446 | + /* all timestamps always follow the ones on the branch */ | |
23447 | + /* mnt->mnt_flags |= MNT_NOATIME | MNT_NODIRATIME; */ | |
027c5e7a AM |
23448 | + root = mount_nodev(fs_type, flags, raw_data, aufs_fill_super); |
23449 | + if (IS_ERR(root)) | |
23450 | + goto out; | |
23451 | + | |
23452 | + sb = root->d_sb; | |
23453 | + si_write_lock(sb, !AuLock_FLUSH); | |
23454 | + sysaufs_brs_add(sb, 0); | |
23455 | + si_write_unlock(sb); | |
23456 | + au_sbilist_add(sb); | |
23457 | + | |
23458 | +out: | |
23459 | + return root; | |
1facf9fc | 23460 | +} |
23461 | + | |
e49829fe JR |
23462 | +static void aufs_kill_sb(struct super_block *sb) |
23463 | +{ | |
23464 | + struct au_sbinfo *sbinfo; | |
23465 | + | |
23466 | + sbinfo = au_sbi(sb); | |
23467 | + if (sbinfo) { | |
23468 | + au_sbilist_del(sb); | |
23469 | + aufs_write_lock(sb->s_root); | |
23470 | + if (sbinfo->si_wbr_create_ops->fin) | |
23471 | + sbinfo->si_wbr_create_ops->fin(sb); | |
23472 | + if (au_opt_test(sbinfo->si_mntflags, UDBA_HNOTIFY)) { | |
23473 | + au_opt_set_udba(sbinfo->si_mntflags, UDBA_NONE); | |
027c5e7a | 23474 | + au_remount_refresh(sb); |
e49829fe JR |
23475 | + } |
23476 | + if (au_opt_test(sbinfo->si_mntflags, PLINK)) | |
23477 | + au_plink_put(sb, /*verbose*/1); | |
23478 | + au_xino_clr(sb); | |
23479 | + aufs_write_unlock(sb->s_root); | |
e49829fe JR |
23480 | + au_nwt_flush(&sbinfo->si_nowait); |
23481 | + } | |
23482 | + generic_shutdown_super(sb); | |
23483 | +} | |
23484 | + | |
1facf9fc | 23485 | +struct file_system_type aufs_fs_type = { |
23486 | + .name = AUFS_FSTYPE, | |
23487 | + .fs_flags = | |
23488 | + FS_RENAME_DOES_D_MOVE /* a race between rename and others */ | |
23489 | + | FS_REVAL_DOT, /* for NFS branch and udba */ | |
027c5e7a | 23490 | + .mount = aufs_mount, |
e49829fe | 23491 | + .kill_sb = aufs_kill_sb, |
1facf9fc | 23492 | + /* no need to __module_get() and module_put(). */ |
23493 | + .owner = THIS_MODULE, | |
23494 | +}; | |
7f207e10 AM |
23495 | diff -urN /usr/share/empty/fs/aufs/super.h linux/fs/aufs/super.h |
23496 | --- /usr/share/empty/fs/aufs/super.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
23497 | +++ linux/fs/aufs/super.h 2011-08-24 13:30:24.734646739 +0200 |
23498 | @@ -0,0 +1,547 @@ | |
1facf9fc | 23499 | +/* |
027c5e7a | 23500 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 23501 | + * |
23502 | + * This program, aufs is free software; you can redistribute it and/or modify | |
23503 | + * it under the terms of the GNU General Public License as published by | |
23504 | + * the Free Software Foundation; either version 2 of the License, or | |
23505 | + * (at your option) any later version. | |
dece6358 AM |
23506 | + * |
23507 | + * This program is distributed in the hope that it will be useful, | |
23508 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
23509 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23510 | + * GNU General Public License for more details. | |
23511 | + * | |
23512 | + * You should have received a copy of the GNU General Public License | |
23513 | + * along with this program; if not, write to the Free Software | |
23514 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 23515 | + */ |
23516 | + | |
23517 | +/* | |
23518 | + * super_block operations | |
23519 | + */ | |
23520 | + | |
23521 | +#ifndef __AUFS_SUPER_H__ | |
23522 | +#define __AUFS_SUPER_H__ | |
23523 | + | |
23524 | +#ifdef __KERNEL__ | |
23525 | + | |
23526 | +#include <linux/fs.h> | |
1facf9fc | 23527 | +#include <linux/aufs_type.h> |
23528 | +#include "rwsem.h" | |
23529 | +#include "spl.h" | |
23530 | +#include "wkq.h" | |
23531 | + | |
23532 | +typedef ssize_t (*au_readf_t)(struct file *, char __user *, size_t, loff_t *); | |
23533 | +typedef ssize_t (*au_writef_t)(struct file *, const char __user *, size_t, | |
23534 | + loff_t *); | |
23535 | + | |
23536 | +/* policies to select one among multiple writable branches */ | |
23537 | +struct au_wbr_copyup_operations { | |
23538 | + int (*copyup)(struct dentry *dentry); | |
23539 | +}; | |
23540 | + | |
23541 | +struct au_wbr_create_operations { | |
23542 | + int (*create)(struct dentry *dentry, int isdir); | |
23543 | + int (*init)(struct super_block *sb); | |
23544 | + int (*fin)(struct super_block *sb); | |
23545 | +}; | |
23546 | + | |
23547 | +struct au_wbr_mfs { | |
23548 | + struct mutex mfs_lock; /* protect this structure */ | |
23549 | + unsigned long mfs_jiffy; | |
23550 | + unsigned long mfs_expire; | |
23551 | + aufs_bindex_t mfs_bindex; | |
23552 | + | |
23553 | + unsigned long long mfsrr_bytes; | |
23554 | + unsigned long long mfsrr_watermark; | |
23555 | +}; | |
23556 | + | |
1facf9fc | 23557 | +struct au_branch; |
23558 | +struct au_sbinfo { | |
23559 | + /* nowait tasks in the system-wide workqueue */ | |
23560 | + struct au_nowait_tasks si_nowait; | |
23561 | + | |
b752ccd1 AM |
23562 | + /* |
23563 | + * tried sb->s_umount, but failed due to the dependecy between i_mutex. | |
23564 | + * rwsem for au_sbinfo is necessary. | |
23565 | + */ | |
dece6358 | 23566 | + struct au_rwsem si_rwsem; |
1facf9fc | 23567 | + |
b752ccd1 AM |
23568 | + /* prevent recursive locking in deleting inode */ |
23569 | + struct { | |
23570 | + unsigned long *bitmap; | |
23571 | + spinlock_t tree_lock; | |
23572 | + struct radix_tree_root tree; | |
23573 | + } au_si_pid; | |
23574 | + | |
7f207e10 AM |
23575 | + /* |
23576 | + * dirty approach to protect sb->sb_inodes and ->s_files from remount. | |
23577 | + */ | |
23578 | + atomic_long_t si_ninodes, si_nfiles; | |
23579 | + | |
1facf9fc | 23580 | + /* branch management */ |
23581 | + unsigned int si_generation; | |
23582 | + | |
23583 | + /* see above flags */ | |
23584 | + unsigned char au_si_status; | |
23585 | + | |
23586 | + aufs_bindex_t si_bend; | |
7f207e10 AM |
23587 | + |
23588 | + /* dirty trick to keep br_id plus */ | |
23589 | + unsigned int si_last_br_id : | |
23590 | + sizeof(aufs_bindex_t) * BITS_PER_BYTE - 1; | |
1facf9fc | 23591 | + struct au_branch **si_branch; |
23592 | + | |
23593 | + /* policy to select a writable branch */ | |
23594 | + unsigned char si_wbr_copyup; | |
23595 | + unsigned char si_wbr_create; | |
23596 | + struct au_wbr_copyup_operations *si_wbr_copyup_ops; | |
23597 | + struct au_wbr_create_operations *si_wbr_create_ops; | |
23598 | + | |
23599 | + /* round robin */ | |
23600 | + atomic_t si_wbr_rr_next; | |
23601 | + | |
23602 | + /* most free space */ | |
23603 | + struct au_wbr_mfs si_wbr_mfs; | |
23604 | + | |
23605 | + /* mount flags */ | |
23606 | + /* include/asm-ia64/siginfo.h defines a macro named si_flags */ | |
23607 | + unsigned int si_mntflags; | |
23608 | + | |
23609 | + /* external inode number (bitmap and translation table) */ | |
23610 | + au_readf_t si_xread; | |
23611 | + au_writef_t si_xwrite; | |
23612 | + struct file *si_xib; | |
23613 | + struct mutex si_xib_mtx; /* protect xib members */ | |
23614 | + unsigned long *si_xib_buf; | |
23615 | + unsigned long si_xib_last_pindex; | |
23616 | + int si_xib_next_bit; | |
23617 | + aufs_bindex_t si_xino_brid; | |
23618 | + /* reserved for future use */ | |
23619 | + /* unsigned long long si_xib_limit; */ /* Max xib file size */ | |
23620 | + | |
23621 | +#ifdef CONFIG_AUFS_EXPORT | |
23622 | + /* i_generation */ | |
23623 | + struct file *si_xigen; | |
23624 | + atomic_t si_xigen_next; | |
23625 | +#endif | |
23626 | + | |
23627 | + /* vdir parameters */ | |
e49829fe | 23628 | + unsigned long si_rdcache; /* max cache time in jiffies */ |
1facf9fc | 23629 | + unsigned int si_rdblk; /* deblk size */ |
23630 | + unsigned int si_rdhash; /* hash size */ | |
23631 | + | |
23632 | + /* | |
23633 | + * If the number of whiteouts are larger than si_dirwh, leave all of | |
23634 | + * them after au_whtmp_ren to reduce the cost of rmdir(2). | |
23635 | + * future fsck.aufs or kernel thread will remove them later. | |
23636 | + * Otherwise, remove all whiteouts and the dir in rmdir(2). | |
23637 | + */ | |
23638 | + unsigned int si_dirwh; | |
23639 | + | |
23640 | + /* | |
23641 | + * rename(2) a directory with all children. | |
23642 | + */ | |
23643 | + /* reserved for future use */ | |
23644 | + /* int si_rendir; */ | |
23645 | + | |
23646 | + /* pseudo_link list */ | |
23647 | + struct au_splhead si_plink; | |
23648 | + wait_queue_head_t si_plink_wq; | |
4a4d8108 | 23649 | + spinlock_t si_plink_maint_lock; |
e49829fe | 23650 | + pid_t si_plink_maint_pid; |
1facf9fc | 23651 | + |
23652 | + /* | |
23653 | + * sysfs and lifetime management. | |
23654 | + * this is not a small structure and it may be a waste of memory in case | |
23655 | + * of sysfs is disabled, particulary when many aufs-es are mounted. | |
23656 | + * but using sysfs is majority. | |
23657 | + */ | |
23658 | + struct kobject si_kobj; | |
23659 | +#ifdef CONFIG_DEBUG_FS | |
23660 | + struct dentry *si_dbgaufs, *si_dbgaufs_xib; | |
23661 | +#ifdef CONFIG_AUFS_EXPORT | |
23662 | + struct dentry *si_dbgaufs_xigen; | |
23663 | +#endif | |
23664 | +#endif | |
23665 | + | |
e49829fe JR |
23666 | +#ifdef CONFIG_AUFS_SBILIST |
23667 | + struct list_head si_list; | |
23668 | +#endif | |
23669 | + | |
1facf9fc | 23670 | + /* dirty, necessary for unmounting, sysfs and sysrq */ |
23671 | + struct super_block *si_sb; | |
23672 | +}; | |
23673 | + | |
dece6358 AM |
23674 | +/* sbinfo status flags */ |
23675 | +/* | |
23676 | + * set true when refresh_dirs() failed at remount time. | |
23677 | + * then try refreshing dirs at access time again. | |
23678 | + * if it is false, refreshing dirs at access time is unnecesary | |
23679 | + */ | |
027c5e7a | 23680 | +#define AuSi_FAILED_REFRESH_DIR 1 |
dece6358 AM |
23681 | +static inline unsigned char au_do_ftest_si(struct au_sbinfo *sbi, |
23682 | + unsigned int flag) | |
23683 | +{ | |
23684 | + AuRwMustAnyLock(&sbi->si_rwsem); | |
23685 | + return sbi->au_si_status & flag; | |
23686 | +} | |
23687 | +#define au_ftest_si(sbinfo, name) au_do_ftest_si(sbinfo, AuSi_##name) | |
23688 | +#define au_fset_si(sbinfo, name) do { \ | |
23689 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
23690 | + (sbinfo)->au_si_status |= AuSi_##name; \ | |
23691 | +} while (0) | |
23692 | +#define au_fclr_si(sbinfo, name) do { \ | |
23693 | + AuRwMustWriteLock(&(sbinfo)->si_rwsem); \ | |
23694 | + (sbinfo)->au_si_status &= ~AuSi_##name; \ | |
23695 | +} while (0) | |
23696 | + | |
1facf9fc | 23697 | +/* ---------------------------------------------------------------------- */ |
23698 | + | |
23699 | +/* policy to select one among writable branches */ | |
4a4d8108 AM |
23700 | +#define AuWbrCopyup(sbinfo, ...) \ |
23701 | + ((sbinfo)->si_wbr_copyup_ops->copyup(__VA_ARGS__)) | |
23702 | +#define AuWbrCreate(sbinfo, ...) \ | |
23703 | + ((sbinfo)->si_wbr_create_ops->create(__VA_ARGS__)) | |
1facf9fc | 23704 | + |
23705 | +/* flags for si_read_lock()/aufs_read_lock()/di_read_lock() */ | |
23706 | +#define AuLock_DW 1 /* write-lock dentry */ | |
23707 | +#define AuLock_IR (1 << 1) /* read-lock inode */ | |
23708 | +#define AuLock_IW (1 << 2) /* write-lock inode */ | |
23709 | +#define AuLock_FLUSH (1 << 3) /* wait for 'nowait' tasks */ | |
23710 | +#define AuLock_DIR (1 << 4) /* target is a dir */ | |
e49829fe JR |
23711 | +#define AuLock_NOPLM (1 << 5) /* return err in plm mode */ |
23712 | +#define AuLock_NOPLMW (1 << 6) /* wait for plm mode ends */ | |
027c5e7a | 23713 | +#define AuLock_GEN (1 << 7) /* test digen/iigen */ |
1facf9fc | 23714 | +#define au_ftest_lock(flags, name) ((flags) & AuLock_##name) |
7f207e10 AM |
23715 | +#define au_fset_lock(flags, name) \ |
23716 | + do { (flags) |= AuLock_##name; } while (0) | |
23717 | +#define au_fclr_lock(flags, name) \ | |
23718 | + do { (flags) &= ~AuLock_##name; } while (0) | |
1facf9fc | 23719 | + |
23720 | +/* ---------------------------------------------------------------------- */ | |
23721 | + | |
23722 | +/* super.c */ | |
23723 | +extern struct file_system_type aufs_fs_type; | |
23724 | +struct inode *au_iget_locked(struct super_block *sb, ino_t ino); | |
7f207e10 AM |
23725 | +typedef unsigned long long (*au_arraycb_t)(void *array, unsigned long long max, |
23726 | + void *arg); | |
23727 | +void au_array_free(void *array); | |
23728 | +void *au_array_alloc(unsigned long long *hint, au_arraycb_t cb, void *arg); | |
23729 | +struct inode **au_iarray_alloc(struct super_block *sb, unsigned long long *max); | |
23730 | +void au_iarray_free(struct inode **a, unsigned long long max); | |
1facf9fc | 23731 | + |
23732 | +/* sbinfo.c */ | |
23733 | +void au_si_free(struct kobject *kobj); | |
23734 | +int au_si_alloc(struct super_block *sb); | |
23735 | +int au_sbr_realloc(struct au_sbinfo *sbinfo, int nbr); | |
23736 | + | |
23737 | +unsigned int au_sigen_inc(struct super_block *sb); | |
23738 | +aufs_bindex_t au_new_br_id(struct super_block *sb); | |
23739 | + | |
e49829fe JR |
23740 | +int si_read_lock(struct super_block *sb, int flags); |
23741 | +int si_write_lock(struct super_block *sb, int flags); | |
23742 | +int aufs_read_lock(struct dentry *dentry, int flags); | |
1facf9fc | 23743 | +void aufs_read_unlock(struct dentry *dentry, int flags); |
23744 | +void aufs_write_lock(struct dentry *dentry); | |
23745 | +void aufs_write_unlock(struct dentry *dentry); | |
e49829fe | 23746 | +int aufs_read_and_write_lock2(struct dentry *d1, struct dentry *d2, int flags); |
1facf9fc | 23747 | +void aufs_read_and_write_unlock2(struct dentry *d1, struct dentry *d2); |
23748 | + | |
b752ccd1 AM |
23749 | +int si_pid_test_slow(struct super_block *sb); |
23750 | +void si_pid_set_slow(struct super_block *sb); | |
23751 | +void si_pid_clr_slow(struct super_block *sb); | |
23752 | + | |
1facf9fc | 23753 | +/* wbr_policy.c */ |
23754 | +extern struct au_wbr_copyup_operations au_wbr_copyup_ops[]; | |
23755 | +extern struct au_wbr_create_operations au_wbr_create_ops[]; | |
23756 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst); | |
23757 | + | |
23758 | +/* ---------------------------------------------------------------------- */ | |
23759 | + | |
23760 | +static inline struct au_sbinfo *au_sbi(struct super_block *sb) | |
23761 | +{ | |
23762 | + return sb->s_fs_info; | |
23763 | +} | |
23764 | + | |
23765 | +/* ---------------------------------------------------------------------- */ | |
23766 | + | |
23767 | +#ifdef CONFIG_AUFS_EXPORT | |
23768 | +void au_export_init(struct super_block *sb); | |
23769 | + | |
b752ccd1 | 23770 | +static inline int au_test_nfsd(void) |
1facf9fc | 23771 | +{ |
b752ccd1 AM |
23772 | + struct task_struct *tsk = current; |
23773 | + | |
23774 | + return (tsk->flags & PF_KTHREAD) | |
23775 | + && !strcmp(tsk->comm, "nfsd"); | |
1facf9fc | 23776 | +} |
23777 | + | |
b752ccd1 | 23778 | +void au_xigen_inc(struct inode *inode); |
1facf9fc | 23779 | +int au_xigen_new(struct inode *inode); |
23780 | +int au_xigen_set(struct super_block *sb, struct file *base); | |
23781 | +void au_xigen_clr(struct super_block *sb); | |
23782 | + | |
23783 | +static inline int au_busy_or_stale(void) | |
23784 | +{ | |
b752ccd1 | 23785 | + if (!au_test_nfsd()) |
1facf9fc | 23786 | + return -EBUSY; |
23787 | + return -ESTALE; | |
23788 | +} | |
23789 | +#else | |
4a4d8108 | 23790 | +AuStubVoid(au_export_init, struct super_block *sb) |
b752ccd1 AM |
23791 | +AuStubInt0(au_test_nfsd, void) |
23792 | +AuStubVoid(au_xigen_inc, struct inode *inode) | |
4a4d8108 AM |
23793 | +AuStubInt0(au_xigen_new, struct inode *inode) |
23794 | +AuStubInt0(au_xigen_set, struct super_block *sb, struct file *base) | |
23795 | +AuStubVoid(au_xigen_clr, struct super_block *sb) | |
1facf9fc | 23796 | +static inline int au_busy_or_stale(void) |
23797 | +{ | |
23798 | + return -EBUSY; | |
23799 | +} | |
23800 | +#endif /* CONFIG_AUFS_EXPORT */ | |
23801 | + | |
23802 | +/* ---------------------------------------------------------------------- */ | |
23803 | + | |
e49829fe JR |
23804 | +#ifdef CONFIG_AUFS_SBILIST |
23805 | +/* module.c */ | |
23806 | +extern struct au_splhead au_sbilist; | |
23807 | + | |
23808 | +static inline void au_sbilist_init(void) | |
23809 | +{ | |
23810 | + au_spl_init(&au_sbilist); | |
23811 | +} | |
23812 | + | |
23813 | +static inline void au_sbilist_add(struct super_block *sb) | |
23814 | +{ | |
23815 | + au_spl_add(&au_sbi(sb)->si_list, &au_sbilist); | |
23816 | +} | |
23817 | + | |
23818 | +static inline void au_sbilist_del(struct super_block *sb) | |
23819 | +{ | |
23820 | + au_spl_del(&au_sbi(sb)->si_list, &au_sbilist); | |
23821 | +} | |
53392da6 AM |
23822 | + |
23823 | +#ifdef CONFIG_AUFS_MAGIC_SYSRQ | |
23824 | +static inline void au_sbilist_lock(void) | |
23825 | +{ | |
23826 | + spin_lock(&au_sbilist.spin); | |
23827 | +} | |
23828 | + | |
23829 | +static inline void au_sbilist_unlock(void) | |
23830 | +{ | |
23831 | + spin_unlock(&au_sbilist.spin); | |
23832 | +} | |
23833 | +#define AuGFP_SBILIST GFP_ATOMIC | |
23834 | +#else | |
23835 | +AuStubVoid(au_sbilist_lock, void) | |
23836 | +AuStubVoid(au_sbilist_unlock, void) | |
23837 | +#define AuGFP_SBILIST GFP_NOFS | |
23838 | +#endif /* CONFIG_AUFS_MAGIC_SYSRQ */ | |
e49829fe JR |
23839 | +#else |
23840 | +AuStubVoid(au_sbilist_init, void) | |
23841 | +AuStubVoid(au_sbilist_add, struct super_block*) | |
23842 | +AuStubVoid(au_sbilist_del, struct super_block*) | |
53392da6 AM |
23843 | +AuStubVoid(au_sbilist_lock, void) |
23844 | +AuStubVoid(au_sbilist_unlock, void) | |
23845 | +#define AuGFP_SBILIST GFP_NOFS | |
e49829fe JR |
23846 | +#endif |
23847 | + | |
23848 | +/* ---------------------------------------------------------------------- */ | |
23849 | + | |
1facf9fc | 23850 | +static inline void dbgaufs_si_null(struct au_sbinfo *sbinfo) |
23851 | +{ | |
dece6358 AM |
23852 | + /* |
23853 | + * This function is a dynamic '__init' fucntion actually, | |
23854 | + * so the tiny check for si_rwsem is unnecessary. | |
23855 | + */ | |
23856 | + /* AuRwMustWriteLock(&sbinfo->si_rwsem); */ | |
1facf9fc | 23857 | +#ifdef CONFIG_DEBUG_FS |
23858 | + sbinfo->si_dbgaufs = NULL; | |
23859 | + sbinfo->si_dbgaufs_xib = NULL; | |
23860 | +#ifdef CONFIG_AUFS_EXPORT | |
23861 | + sbinfo->si_dbgaufs_xigen = NULL; | |
23862 | +#endif | |
23863 | +#endif | |
23864 | +} | |
23865 | + | |
23866 | +/* ---------------------------------------------------------------------- */ | |
23867 | + | |
b752ccd1 AM |
23868 | +static inline pid_t si_pid_bit(void) |
23869 | +{ | |
23870 | + /* the origin of pid is 1, but the bitmap's is 0 */ | |
23871 | + return current->pid - 1; | |
23872 | +} | |
23873 | + | |
23874 | +static inline int si_pid_test(struct super_block *sb) | |
23875 | +{ | |
23876 | + pid_t bit = si_pid_bit(); | |
23877 | + if (bit < PID_MAX_DEFAULT) | |
23878 | + return test_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
23879 | + else | |
23880 | + return si_pid_test_slow(sb); | |
23881 | +} | |
23882 | + | |
23883 | +static inline void si_pid_set(struct super_block *sb) | |
23884 | +{ | |
23885 | + pid_t bit = si_pid_bit(); | |
23886 | + if (bit < PID_MAX_DEFAULT) { | |
23887 | + AuDebugOn(test_bit(bit, au_sbi(sb)->au_si_pid.bitmap)); | |
23888 | + set_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
23889 | + /* smp_mb(); */ | |
23890 | + } else | |
23891 | + si_pid_set_slow(sb); | |
23892 | +} | |
23893 | + | |
23894 | +static inline void si_pid_clr(struct super_block *sb) | |
23895 | +{ | |
23896 | + pid_t bit = si_pid_bit(); | |
23897 | + if (bit < PID_MAX_DEFAULT) { | |
23898 | + AuDebugOn(!test_bit(bit, au_sbi(sb)->au_si_pid.bitmap)); | |
23899 | + clear_bit(bit, au_sbi(sb)->au_si_pid.bitmap); | |
23900 | + /* smp_mb(); */ | |
23901 | + } else | |
23902 | + si_pid_clr_slow(sb); | |
23903 | +} | |
23904 | + | |
23905 | +/* ---------------------------------------------------------------------- */ | |
23906 | + | |
1facf9fc | 23907 | +/* lock superblock. mainly for entry point functions */ |
23908 | +/* | |
b752ccd1 AM |
23909 | + * __si_read_lock, __si_write_lock, |
23910 | + * __si_read_unlock, __si_write_unlock, __si_downgrade_lock | |
1facf9fc | 23911 | + */ |
b752ccd1 | 23912 | +AuSimpleRwsemFuncs(__si, struct super_block *sb, &au_sbi(sb)->si_rwsem); |
1facf9fc | 23913 | + |
dece6358 AM |
23914 | +#define SiMustNoWaiters(sb) AuRwMustNoWaiters(&au_sbi(sb)->si_rwsem) |
23915 | +#define SiMustAnyLock(sb) AuRwMustAnyLock(&au_sbi(sb)->si_rwsem) | |
23916 | +#define SiMustWriteLock(sb) AuRwMustWriteLock(&au_sbi(sb)->si_rwsem) | |
23917 | + | |
b752ccd1 AM |
23918 | +static inline void si_noflush_read_lock(struct super_block *sb) |
23919 | +{ | |
23920 | + __si_read_lock(sb); | |
23921 | + si_pid_set(sb); | |
23922 | +} | |
23923 | + | |
23924 | +static inline int si_noflush_read_trylock(struct super_block *sb) | |
23925 | +{ | |
23926 | + int locked = __si_read_trylock(sb); | |
23927 | + if (locked) | |
23928 | + si_pid_set(sb); | |
23929 | + return locked; | |
23930 | +} | |
23931 | + | |
23932 | +static inline void si_noflush_write_lock(struct super_block *sb) | |
23933 | +{ | |
23934 | + __si_write_lock(sb); | |
23935 | + si_pid_set(sb); | |
23936 | +} | |
23937 | + | |
23938 | +static inline int si_noflush_write_trylock(struct super_block *sb) | |
23939 | +{ | |
23940 | + int locked = __si_write_trylock(sb); | |
23941 | + if (locked) | |
23942 | + si_pid_set(sb); | |
23943 | + return locked; | |
23944 | +} | |
23945 | + | |
e49829fe | 23946 | +#if 0 /* unused */ |
1facf9fc | 23947 | +static inline int si_read_trylock(struct super_block *sb, int flags) |
23948 | +{ | |
23949 | + if (au_ftest_lock(flags, FLUSH)) | |
23950 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
23951 | + return si_noflush_read_trylock(sb); | |
23952 | +} | |
e49829fe | 23953 | +#endif |
1facf9fc | 23954 | + |
b752ccd1 AM |
23955 | +static inline void si_read_unlock(struct super_block *sb) |
23956 | +{ | |
23957 | + si_pid_clr(sb); | |
23958 | + __si_read_unlock(sb); | |
23959 | +} | |
23960 | + | |
b752ccd1 | 23961 | +#if 0 /* unused */ |
1facf9fc | 23962 | +static inline int si_write_trylock(struct super_block *sb, int flags) |
23963 | +{ | |
23964 | + if (au_ftest_lock(flags, FLUSH)) | |
23965 | + au_nwt_flush(&au_sbi(sb)->si_nowait); | |
23966 | + return si_noflush_write_trylock(sb); | |
23967 | +} | |
b752ccd1 AM |
23968 | +#endif |
23969 | + | |
23970 | +static inline void si_write_unlock(struct super_block *sb) | |
23971 | +{ | |
23972 | + si_pid_clr(sb); | |
23973 | + __si_write_unlock(sb); | |
23974 | +} | |
23975 | + | |
23976 | +#if 0 /* unused */ | |
23977 | +static inline void si_downgrade_lock(struct super_block *sb) | |
23978 | +{ | |
23979 | + __si_downgrade_lock(sb); | |
23980 | +} | |
23981 | +#endif | |
1facf9fc | 23982 | + |
23983 | +/* ---------------------------------------------------------------------- */ | |
23984 | + | |
23985 | +static inline aufs_bindex_t au_sbend(struct super_block *sb) | |
23986 | +{ | |
dece6358 | 23987 | + SiMustAnyLock(sb); |
1facf9fc | 23988 | + return au_sbi(sb)->si_bend; |
23989 | +} | |
23990 | + | |
23991 | +static inline unsigned int au_mntflags(struct super_block *sb) | |
23992 | +{ | |
dece6358 | 23993 | + SiMustAnyLock(sb); |
1facf9fc | 23994 | + return au_sbi(sb)->si_mntflags; |
23995 | +} | |
23996 | + | |
23997 | +static inline unsigned int au_sigen(struct super_block *sb) | |
23998 | +{ | |
dece6358 | 23999 | + SiMustAnyLock(sb); |
1facf9fc | 24000 | + return au_sbi(sb)->si_generation; |
24001 | +} | |
24002 | + | |
7f207e10 AM |
24003 | +static inline void au_ninodes_inc(struct super_block *sb) |
24004 | +{ | |
24005 | + atomic_long_inc(&au_sbi(sb)->si_ninodes); | |
24006 | +} | |
24007 | + | |
24008 | +static inline void au_ninodes_dec(struct super_block *sb) | |
24009 | +{ | |
24010 | + AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_ninodes)); | |
24011 | + atomic_long_dec(&au_sbi(sb)->si_ninodes); | |
24012 | +} | |
24013 | + | |
24014 | +static inline void au_nfiles_inc(struct super_block *sb) | |
24015 | +{ | |
24016 | + atomic_long_inc(&au_sbi(sb)->si_nfiles); | |
24017 | +} | |
24018 | + | |
24019 | +static inline void au_nfiles_dec(struct super_block *sb) | |
24020 | +{ | |
24021 | + AuDebugOn(!atomic_long_read(&au_sbi(sb)->si_nfiles)); | |
24022 | + atomic_long_dec(&au_sbi(sb)->si_nfiles); | |
24023 | +} | |
24024 | + | |
1facf9fc | 24025 | +static inline struct au_branch *au_sbr(struct super_block *sb, |
24026 | + aufs_bindex_t bindex) | |
24027 | +{ | |
dece6358 | 24028 | + SiMustAnyLock(sb); |
1facf9fc | 24029 | + return au_sbi(sb)->si_branch[0 + bindex]; |
24030 | +} | |
24031 | + | |
24032 | +static inline void au_xino_brid_set(struct super_block *sb, aufs_bindex_t brid) | |
24033 | +{ | |
dece6358 | 24034 | + SiMustWriteLock(sb); |
1facf9fc | 24035 | + au_sbi(sb)->si_xino_brid = brid; |
24036 | +} | |
24037 | + | |
24038 | +static inline aufs_bindex_t au_xino_brid(struct super_block *sb) | |
24039 | +{ | |
dece6358 | 24040 | + SiMustAnyLock(sb); |
1facf9fc | 24041 | + return au_sbi(sb)->si_xino_brid; |
24042 | +} | |
24043 | + | |
24044 | +#endif /* __KERNEL__ */ | |
24045 | +#endif /* __AUFS_SUPER_H__ */ | |
7f207e10 AM |
24046 | diff -urN /usr/share/empty/fs/aufs/sysaufs.c linux/fs/aufs/sysaufs.c |
24047 | --- /usr/share/empty/fs/aufs/sysaufs.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 24048 | +++ linux/fs/aufs/sysaufs.c 2011-08-24 13:30:24.734646739 +0200 |
4a4d8108 | 24049 | @@ -0,0 +1,107 @@ |
1facf9fc | 24050 | +/* |
027c5e7a | 24051 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 24052 | + * |
24053 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24054 | + * it under the terms of the GNU General Public License as published by | |
24055 | + * the Free Software Foundation; either version 2 of the License, or | |
24056 | + * (at your option) any later version. | |
dece6358 AM |
24057 | + * |
24058 | + * This program is distributed in the hope that it will be useful, | |
24059 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24060 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24061 | + * GNU General Public License for more details. | |
24062 | + * | |
24063 | + * You should have received a copy of the GNU General Public License | |
24064 | + * along with this program; if not, write to the Free Software | |
24065 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24066 | + */ |
24067 | + | |
24068 | +/* | |
24069 | + * sysfs interface and lifetime management | |
24070 | + * they are necessary regardless sysfs is disabled. | |
24071 | + */ | |
24072 | + | |
24073 | +#include <linux/fs.h> | |
24074 | +#include <linux/random.h> | |
24075 | +#include <linux/sysfs.h> | |
24076 | +#include "aufs.h" | |
24077 | + | |
24078 | +unsigned long sysaufs_si_mask; | |
e49829fe | 24079 | +struct kset *sysaufs_kset; |
1facf9fc | 24080 | + |
24081 | +#define AuSiAttr(_name) { \ | |
24082 | + .attr = { .name = __stringify(_name), .mode = 0444 }, \ | |
24083 | + .show = sysaufs_si_##_name, \ | |
24084 | +} | |
24085 | + | |
24086 | +static struct sysaufs_si_attr sysaufs_si_attr_xi_path = AuSiAttr(xi_path); | |
24087 | +struct attribute *sysaufs_si_attrs[] = { | |
24088 | + &sysaufs_si_attr_xi_path.attr, | |
24089 | + NULL, | |
24090 | +}; | |
24091 | + | |
4a4d8108 | 24092 | +static const struct sysfs_ops au_sbi_ops = { |
1facf9fc | 24093 | + .show = sysaufs_si_show |
24094 | +}; | |
24095 | + | |
24096 | +static struct kobj_type au_sbi_ktype = { | |
24097 | + .release = au_si_free, | |
24098 | + .sysfs_ops = &au_sbi_ops, | |
24099 | + .default_attrs = sysaufs_si_attrs | |
24100 | +}; | |
24101 | + | |
24102 | +/* ---------------------------------------------------------------------- */ | |
24103 | + | |
24104 | +int sysaufs_si_init(struct au_sbinfo *sbinfo) | |
24105 | +{ | |
24106 | + int err; | |
24107 | + | |
e49829fe | 24108 | + sbinfo->si_kobj.kset = sysaufs_kset; |
1facf9fc | 24109 | + /* cf. sysaufs_name() */ |
24110 | + err = kobject_init_and_add | |
e49829fe | 24111 | + (&sbinfo->si_kobj, &au_sbi_ktype, /*&sysaufs_kset->kobj*/NULL, |
1facf9fc | 24112 | + SysaufsSiNamePrefix "%lx", sysaufs_si_id(sbinfo)); |
24113 | + | |
24114 | + dbgaufs_si_null(sbinfo); | |
24115 | + if (!err) { | |
24116 | + err = dbgaufs_si_init(sbinfo); | |
24117 | + if (unlikely(err)) | |
24118 | + kobject_put(&sbinfo->si_kobj); | |
24119 | + } | |
24120 | + return err; | |
24121 | +} | |
24122 | + | |
24123 | +void sysaufs_fin(void) | |
24124 | +{ | |
24125 | + dbgaufs_fin(); | |
e49829fe JR |
24126 | + sysfs_remove_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
24127 | + kset_unregister(sysaufs_kset); | |
1facf9fc | 24128 | +} |
24129 | + | |
24130 | +int __init sysaufs_init(void) | |
24131 | +{ | |
24132 | + int err; | |
24133 | + | |
24134 | + do { | |
24135 | + get_random_bytes(&sysaufs_si_mask, sizeof(sysaufs_si_mask)); | |
24136 | + } while (!sysaufs_si_mask); | |
24137 | + | |
4a4d8108 | 24138 | + err = -EINVAL; |
e49829fe JR |
24139 | + sysaufs_kset = kset_create_and_add(AUFS_NAME, NULL, fs_kobj); |
24140 | + if (unlikely(!sysaufs_kset)) | |
4a4d8108 | 24141 | + goto out; |
e49829fe JR |
24142 | + err = PTR_ERR(sysaufs_kset); |
24143 | + if (IS_ERR(sysaufs_kset)) | |
1facf9fc | 24144 | + goto out; |
e49829fe | 24145 | + err = sysfs_create_group(&sysaufs_kset->kobj, sysaufs_attr_group); |
1facf9fc | 24146 | + if (unlikely(err)) { |
e49829fe | 24147 | + kset_unregister(sysaufs_kset); |
1facf9fc | 24148 | + goto out; |
24149 | + } | |
24150 | + | |
24151 | + err = dbgaufs_init(); | |
24152 | + if (unlikely(err)) | |
24153 | + sysaufs_fin(); | |
4f0767ce | 24154 | +out: |
1facf9fc | 24155 | + return err; |
24156 | +} | |
7f207e10 AM |
24157 | diff -urN /usr/share/empty/fs/aufs/sysaufs.h linux/fs/aufs/sysaufs.h |
24158 | --- /usr/share/empty/fs/aufs/sysaufs.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 24159 | +++ linux/fs/aufs/sysaufs.h 2011-08-24 13:30:24.734646739 +0200 |
4a4d8108 | 24160 | @@ -0,0 +1,105 @@ |
1facf9fc | 24161 | +/* |
027c5e7a | 24162 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 24163 | + * |
24164 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24165 | + * it under the terms of the GNU General Public License as published by | |
24166 | + * the Free Software Foundation; either version 2 of the License, or | |
24167 | + * (at your option) any later version. | |
dece6358 AM |
24168 | + * |
24169 | + * This program is distributed in the hope that it will be useful, | |
24170 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24171 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24172 | + * GNU General Public License for more details. | |
24173 | + * | |
24174 | + * You should have received a copy of the GNU General Public License | |
24175 | + * along with this program; if not, write to the Free Software | |
24176 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24177 | + */ |
24178 | + | |
24179 | +/* | |
24180 | + * sysfs interface and mount lifetime management | |
24181 | + */ | |
24182 | + | |
24183 | +#ifndef __SYSAUFS_H__ | |
24184 | +#define __SYSAUFS_H__ | |
24185 | + | |
24186 | +#ifdef __KERNEL__ | |
24187 | + | |
1facf9fc | 24188 | +#include <linux/sysfs.h> |
24189 | +#include <linux/aufs_type.h> | |
24190 | +#include "module.h" | |
24191 | + | |
dece6358 AM |
24192 | +struct super_block; |
24193 | +struct au_sbinfo; | |
24194 | + | |
1facf9fc | 24195 | +struct sysaufs_si_attr { |
24196 | + struct attribute attr; | |
24197 | + int (*show)(struct seq_file *seq, struct super_block *sb); | |
24198 | +}; | |
24199 | + | |
24200 | +/* ---------------------------------------------------------------------- */ | |
24201 | + | |
24202 | +/* sysaufs.c */ | |
24203 | +extern unsigned long sysaufs_si_mask; | |
e49829fe | 24204 | +extern struct kset *sysaufs_kset; |
1facf9fc | 24205 | +extern struct attribute *sysaufs_si_attrs[]; |
24206 | +int sysaufs_si_init(struct au_sbinfo *sbinfo); | |
24207 | +int __init sysaufs_init(void); | |
24208 | +void sysaufs_fin(void); | |
24209 | + | |
24210 | +/* ---------------------------------------------------------------------- */ | |
24211 | + | |
24212 | +/* some people doesn't like to show a pointer in kernel */ | |
24213 | +static inline unsigned long sysaufs_si_id(struct au_sbinfo *sbinfo) | |
24214 | +{ | |
24215 | + return sysaufs_si_mask ^ (unsigned long)sbinfo; | |
24216 | +} | |
24217 | + | |
24218 | +#define SysaufsSiNamePrefix "si_" | |
24219 | +#define SysaufsSiNameLen (sizeof(SysaufsSiNamePrefix) + 16) | |
24220 | +static inline void sysaufs_name(struct au_sbinfo *sbinfo, char *name) | |
24221 | +{ | |
24222 | + snprintf(name, SysaufsSiNameLen, SysaufsSiNamePrefix "%lx", | |
24223 | + sysaufs_si_id(sbinfo)); | |
24224 | +} | |
24225 | + | |
24226 | +struct au_branch; | |
24227 | +#ifdef CONFIG_SYSFS | |
24228 | +/* sysfs.c */ | |
24229 | +extern struct attribute_group *sysaufs_attr_group; | |
24230 | + | |
24231 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb); | |
24232 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
24233 | + char *buf); | |
24234 | + | |
24235 | +void sysaufs_br_init(struct au_branch *br); | |
24236 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex); | |
24237 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex); | |
24238 | + | |
24239 | +#define sysaufs_brs_init() do {} while (0) | |
24240 | + | |
24241 | +#else | |
24242 | +#define sysaufs_attr_group NULL | |
24243 | + | |
4a4d8108 | 24244 | +AuStubInt0(sysaufs_si_xi_path, struct seq_file *seq, struct super_block *sb) |
1facf9fc | 24245 | + |
24246 | +static inline | |
24247 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
24248 | + char *buf) | |
24249 | +{ | |
24250 | + return 0; | |
24251 | +} | |
24252 | + | |
4a4d8108 AM |
24253 | +AuStubVoid(sysaufs_br_init, struct au_branch *br) |
24254 | +AuStubVoid(sysaufs_brs_add, struct super_block *sb, aufs_bindex_t bindex) | |
24255 | +AuStubVoid(sysaufs_brs_del, struct super_block *sb, aufs_bindex_t bindex) | |
1facf9fc | 24256 | + |
24257 | +static inline void sysaufs_brs_init(void) | |
24258 | +{ | |
24259 | + sysaufs_brs = 0; | |
24260 | +} | |
24261 | + | |
24262 | +#endif /* CONFIG_SYSFS */ | |
24263 | + | |
24264 | +#endif /* __KERNEL__ */ | |
24265 | +#endif /* __SYSAUFS_H__ */ | |
7f207e10 AM |
24266 | diff -urN /usr/share/empty/fs/aufs/sysfs.c linux/fs/aufs/sysfs.c |
24267 | --- /usr/share/empty/fs/aufs/sysfs.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 24268 | +++ linux/fs/aufs/sysfs.c 2011-08-24 13:30:24.734646739 +0200 |
953406b4 | 24269 | @@ -0,0 +1,250 @@ |
1facf9fc | 24270 | +/* |
027c5e7a | 24271 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 24272 | + * |
24273 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24274 | + * it under the terms of the GNU General Public License as published by | |
24275 | + * the Free Software Foundation; either version 2 of the License, or | |
24276 | + * (at your option) any later version. | |
dece6358 AM |
24277 | + * |
24278 | + * This program is distributed in the hope that it will be useful, | |
24279 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24280 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24281 | + * GNU General Public License for more details. | |
24282 | + * | |
24283 | + * You should have received a copy of the GNU General Public License | |
24284 | + * along with this program; if not, write to the Free Software | |
24285 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24286 | + */ |
24287 | + | |
24288 | +/* | |
24289 | + * sysfs interface | |
24290 | + */ | |
24291 | + | |
24292 | +#include <linux/fs.h> | |
dece6358 | 24293 | +#include <linux/module.h> |
1facf9fc | 24294 | +#include <linux/seq_file.h> |
24295 | +#include <linux/sysfs.h> | |
24296 | +#include "aufs.h" | |
24297 | + | |
4a4d8108 AM |
24298 | +#ifdef CONFIG_AUFS_FS_MODULE |
24299 | +/* this entry violates the "one line per file" policy of sysfs */ | |
24300 | +static ssize_t config_show(struct kobject *kobj, struct kobj_attribute *attr, | |
24301 | + char *buf) | |
24302 | +{ | |
24303 | + ssize_t err; | |
24304 | + static char *conf = | |
24305 | +/* this file is generated at compiling */ | |
24306 | +#include "conf.str" | |
24307 | + ; | |
24308 | + | |
24309 | + err = snprintf(buf, PAGE_SIZE, conf); | |
24310 | + if (unlikely(err >= PAGE_SIZE)) | |
24311 | + err = -EFBIG; | |
24312 | + return err; | |
24313 | +} | |
24314 | + | |
24315 | +static struct kobj_attribute au_config_attr = __ATTR_RO(config); | |
24316 | +#endif | |
24317 | + | |
1facf9fc | 24318 | +static struct attribute *au_attr[] = { |
4a4d8108 AM |
24319 | +#ifdef CONFIG_AUFS_FS_MODULE |
24320 | + &au_config_attr.attr, | |
24321 | +#endif | |
1facf9fc | 24322 | + NULL, /* need to NULL terminate the list of attributes */ |
24323 | +}; | |
24324 | + | |
24325 | +static struct attribute_group sysaufs_attr_group_body = { | |
24326 | + .attrs = au_attr | |
24327 | +}; | |
24328 | + | |
24329 | +struct attribute_group *sysaufs_attr_group = &sysaufs_attr_group_body; | |
24330 | + | |
24331 | +/* ---------------------------------------------------------------------- */ | |
24332 | + | |
24333 | +int sysaufs_si_xi_path(struct seq_file *seq, struct super_block *sb) | |
24334 | +{ | |
24335 | + int err; | |
24336 | + | |
dece6358 AM |
24337 | + SiMustAnyLock(sb); |
24338 | + | |
1facf9fc | 24339 | + err = 0; |
24340 | + if (au_opt_test(au_mntflags(sb), XINO)) { | |
24341 | + err = au_xino_path(seq, au_sbi(sb)->si_xib); | |
24342 | + seq_putc(seq, '\n'); | |
24343 | + } | |
24344 | + return err; | |
24345 | +} | |
24346 | + | |
24347 | +/* | |
24348 | + * the lifetime of branch is independent from the entry under sysfs. | |
24349 | + * sysfs handles the lifetime of the entry, and never call ->show() after it is | |
24350 | + * unlinked. | |
24351 | + */ | |
24352 | +static int sysaufs_si_br(struct seq_file *seq, struct super_block *sb, | |
24353 | + aufs_bindex_t bindex) | |
24354 | +{ | |
24355 | + struct path path; | |
24356 | + struct dentry *root; | |
24357 | + struct au_branch *br; | |
24358 | + | |
24359 | + AuDbg("b%d\n", bindex); | |
24360 | + | |
24361 | + root = sb->s_root; | |
24362 | + di_read_lock_parent(root, !AuLock_IR); | |
24363 | + br = au_sbr(sb, bindex); | |
24364 | + path.mnt = br->br_mnt; | |
24365 | + path.dentry = au_h_dptr(root, bindex); | |
24366 | + au_seq_path(seq, &path); | |
24367 | + di_read_unlock(root, !AuLock_IR); | |
24368 | + seq_printf(seq, "=%s\n", au_optstr_br_perm(br->br_perm)); | |
24369 | + return 0; | |
24370 | +} | |
24371 | + | |
24372 | +/* ---------------------------------------------------------------------- */ | |
24373 | + | |
24374 | +static struct seq_file *au_seq(char *p, ssize_t len) | |
24375 | +{ | |
24376 | + struct seq_file *seq; | |
24377 | + | |
24378 | + seq = kzalloc(sizeof(*seq), GFP_NOFS); | |
24379 | + if (seq) { | |
24380 | + /* mutex_init(&seq.lock); */ | |
24381 | + seq->buf = p; | |
24382 | + seq->size = len; | |
24383 | + return seq; /* success */ | |
24384 | + } | |
24385 | + | |
24386 | + seq = ERR_PTR(-ENOMEM); | |
24387 | + return seq; | |
24388 | +} | |
24389 | + | |
24390 | +#define SysaufsBr_PREFIX "br" | |
24391 | + | |
24392 | +/* todo: file size may exceed PAGE_SIZE */ | |
24393 | +ssize_t sysaufs_si_show(struct kobject *kobj, struct attribute *attr, | |
1308ab2a | 24394 | + char *buf) |
1facf9fc | 24395 | +{ |
24396 | + ssize_t err; | |
24397 | + long l; | |
24398 | + aufs_bindex_t bend; | |
24399 | + struct au_sbinfo *sbinfo; | |
24400 | + struct super_block *sb; | |
24401 | + struct seq_file *seq; | |
24402 | + char *name; | |
24403 | + struct attribute **cattr; | |
24404 | + | |
24405 | + sbinfo = container_of(kobj, struct au_sbinfo, si_kobj); | |
24406 | + sb = sbinfo->si_sb; | |
1308ab2a | 24407 | + |
24408 | + /* | |
24409 | + * prevent a race condition between sysfs and aufs. | |
24410 | + * for instance, sysfs_file_read() calls sysfs_get_active_two() which | |
24411 | + * prohibits maintaining the sysfs entries. | |
24412 | + * hew we acquire read lock after sysfs_get_active_two(). | |
24413 | + * on the other hand, the remount process may maintain the sysfs/aufs | |
24414 | + * entries after acquiring write lock. | |
24415 | + * it can cause a deadlock. | |
24416 | + * simply we gave up processing read here. | |
24417 | + */ | |
24418 | + err = -EBUSY; | |
24419 | + if (unlikely(!si_noflush_read_trylock(sb))) | |
24420 | + goto out; | |
1facf9fc | 24421 | + |
24422 | + seq = au_seq(buf, PAGE_SIZE); | |
24423 | + err = PTR_ERR(seq); | |
24424 | + if (IS_ERR(seq)) | |
1308ab2a | 24425 | + goto out_unlock; |
1facf9fc | 24426 | + |
24427 | + name = (void *)attr->name; | |
24428 | + cattr = sysaufs_si_attrs; | |
24429 | + while (*cattr) { | |
24430 | + if (!strcmp(name, (*cattr)->name)) { | |
24431 | + err = container_of(*cattr, struct sysaufs_si_attr, attr) | |
24432 | + ->show(seq, sb); | |
24433 | + goto out_seq; | |
24434 | + } | |
24435 | + cattr++; | |
24436 | + } | |
24437 | + | |
24438 | + bend = au_sbend(sb); | |
24439 | + if (!strncmp(name, SysaufsBr_PREFIX, sizeof(SysaufsBr_PREFIX) - 1)) { | |
24440 | + name += sizeof(SysaufsBr_PREFIX) - 1; | |
24441 | + err = strict_strtol(name, 10, &l); | |
24442 | + if (!err) { | |
24443 | + if (l <= bend) | |
24444 | + err = sysaufs_si_br(seq, sb, (aufs_bindex_t)l); | |
24445 | + else | |
24446 | + err = -ENOENT; | |
24447 | + } | |
24448 | + goto out_seq; | |
24449 | + } | |
24450 | + BUG(); | |
24451 | + | |
4f0767ce | 24452 | +out_seq: |
1facf9fc | 24453 | + if (!err) { |
24454 | + err = seq->count; | |
24455 | + /* sysfs limit */ | |
24456 | + if (unlikely(err == PAGE_SIZE)) | |
24457 | + err = -EFBIG; | |
24458 | + } | |
24459 | + kfree(seq); | |
4f0767ce | 24460 | +out_unlock: |
1facf9fc | 24461 | + si_read_unlock(sb); |
4f0767ce | 24462 | +out: |
1facf9fc | 24463 | + return err; |
24464 | +} | |
24465 | + | |
24466 | +/* ---------------------------------------------------------------------- */ | |
24467 | + | |
24468 | +void sysaufs_br_init(struct au_branch *br) | |
24469 | +{ | |
4a4d8108 AM |
24470 | + struct attribute *attr = &br->br_attr; |
24471 | + | |
24472 | + sysfs_attr_init(attr); | |
24473 | + attr->name = br->br_name; | |
24474 | + attr->mode = S_IRUGO; | |
1facf9fc | 24475 | +} |
24476 | + | |
24477 | +void sysaufs_brs_del(struct super_block *sb, aufs_bindex_t bindex) | |
24478 | +{ | |
24479 | + struct au_branch *br; | |
24480 | + struct kobject *kobj; | |
24481 | + aufs_bindex_t bend; | |
24482 | + | |
24483 | + dbgaufs_brs_del(sb, bindex); | |
24484 | + | |
24485 | + if (!sysaufs_brs) | |
24486 | + return; | |
24487 | + | |
24488 | + kobj = &au_sbi(sb)->si_kobj; | |
24489 | + bend = au_sbend(sb); | |
24490 | + for (; bindex <= bend; bindex++) { | |
24491 | + br = au_sbr(sb, bindex); | |
24492 | + sysfs_remove_file(kobj, &br->br_attr); | |
24493 | + } | |
24494 | +} | |
24495 | + | |
24496 | +void sysaufs_brs_add(struct super_block *sb, aufs_bindex_t bindex) | |
24497 | +{ | |
24498 | + int err; | |
24499 | + aufs_bindex_t bend; | |
24500 | + struct kobject *kobj; | |
24501 | + struct au_branch *br; | |
24502 | + | |
24503 | + dbgaufs_brs_add(sb, bindex); | |
24504 | + | |
24505 | + if (!sysaufs_brs) | |
24506 | + return; | |
24507 | + | |
24508 | + kobj = &au_sbi(sb)->si_kobj; | |
24509 | + bend = au_sbend(sb); | |
24510 | + for (; bindex <= bend; bindex++) { | |
24511 | + br = au_sbr(sb, bindex); | |
24512 | + snprintf(br->br_name, sizeof(br->br_name), SysaufsBr_PREFIX | |
24513 | + "%d", bindex); | |
24514 | + err = sysfs_create_file(kobj, &br->br_attr); | |
24515 | + if (unlikely(err)) | |
4a4d8108 AM |
24516 | + pr_warning("failed %s under sysfs(%d)\n", |
24517 | + br->br_name, err); | |
1facf9fc | 24518 | + } |
24519 | +} | |
7f207e10 AM |
24520 | diff -urN /usr/share/empty/fs/aufs/sysrq.c linux/fs/aufs/sysrq.c |
24521 | --- /usr/share/empty/fs/aufs/sysrq.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 24522 | +++ linux/fs/aufs/sysrq.c 2011-08-24 13:30:24.734646739 +0200 |
2cbb1c4b | 24523 | @@ -0,0 +1,151 @@ |
1facf9fc | 24524 | +/* |
027c5e7a | 24525 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 24526 | + * |
24527 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24528 | + * it under the terms of the GNU General Public License as published by | |
24529 | + * the Free Software Foundation; either version 2 of the License, or | |
24530 | + * (at your option) any later version. | |
dece6358 AM |
24531 | + * |
24532 | + * This program is distributed in the hope that it will be useful, | |
24533 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24534 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24535 | + * GNU General Public License for more details. | |
24536 | + * | |
24537 | + * You should have received a copy of the GNU General Public License | |
24538 | + * along with this program; if not, write to the Free Software | |
24539 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24540 | + */ |
24541 | + | |
24542 | +/* | |
24543 | + * magic sysrq hanlder | |
24544 | + */ | |
24545 | + | |
24546 | +#include <linux/fs.h> | |
24547 | +#include <linux/module.h> | |
24548 | +#include <linux/moduleparam.h> | |
24549 | +/* #include <linux/sysrq.h> */ | |
027c5e7a | 24550 | +#include <linux/writeback.h> |
1facf9fc | 24551 | +#include "aufs.h" |
24552 | + | |
24553 | +/* ---------------------------------------------------------------------- */ | |
24554 | + | |
24555 | +static void sysrq_sb(struct super_block *sb) | |
24556 | +{ | |
24557 | + char *plevel; | |
24558 | + struct au_sbinfo *sbinfo; | |
24559 | + struct file *file; | |
24560 | + | |
24561 | + plevel = au_plevel; | |
24562 | + au_plevel = KERN_WARNING; | |
1facf9fc | 24563 | + |
24564 | + sbinfo = au_sbi(sb); | |
4a4d8108 AM |
24565 | + /* since we define pr_fmt, call printk directly */ |
24566 | + printk(KERN_WARNING "si=%lx\n", sysaufs_si_id(sbinfo)); | |
24567 | + printk(KERN_WARNING AUFS_NAME ": superblock\n"); | |
1facf9fc | 24568 | + au_dpri_sb(sb); |
027c5e7a AM |
24569 | + |
24570 | +#if 0 | |
4a4d8108 | 24571 | + printk(KERN_WARNING AUFS_NAME ": root dentry\n"); |
1facf9fc | 24572 | + au_dpri_dentry(sb->s_root); |
4a4d8108 | 24573 | + printk(KERN_WARNING AUFS_NAME ": root inode\n"); |
1facf9fc | 24574 | + au_dpri_inode(sb->s_root->d_inode); |
027c5e7a AM |
24575 | +#endif |
24576 | + | |
1facf9fc | 24577 | +#if 0 |
027c5e7a AM |
24578 | + do { |
24579 | + int err, i, j, ndentry; | |
24580 | + struct au_dcsub_pages dpages; | |
24581 | + struct au_dpage *dpage; | |
24582 | + | |
24583 | + err = au_dpages_init(&dpages, GFP_ATOMIC); | |
24584 | + if (unlikely(err)) | |
24585 | + break; | |
24586 | + err = au_dcsub_pages(&dpages, sb->s_root, NULL, NULL); | |
24587 | + if (!err) | |
24588 | + for (i = 0; i < dpages.ndpage; i++) { | |
24589 | + dpage = dpages.dpages + i; | |
24590 | + ndentry = dpage->ndentry; | |
24591 | + for (j = 0; j < ndentry; j++) | |
24592 | + au_dpri_dentry(dpage->dentries[j]); | |
24593 | + } | |
24594 | + au_dpages_free(&dpages); | |
24595 | + } while (0); | |
24596 | +#endif | |
24597 | + | |
24598 | +#if 1 | |
24599 | + { | |
24600 | + struct inode *i; | |
24601 | + printk(KERN_WARNING AUFS_NAME ": isolated inode\n"); | |
2cbb1c4b JR |
24602 | + spin_lock(&inode_sb_list_lock); |
24603 | + list_for_each_entry(i, &sb->s_inodes, i_sb_list) { | |
24604 | + spin_lock(&i->i_lock); | |
027c5e7a AM |
24605 | + if (1 || list_empty(&i->i_dentry)) |
24606 | + au_dpri_inode(i); | |
2cbb1c4b JR |
24607 | + spin_unlock(&i->i_lock); |
24608 | + } | |
24609 | + spin_unlock(&inode_sb_list_lock); | |
027c5e7a | 24610 | + } |
1facf9fc | 24611 | +#endif |
4a4d8108 | 24612 | + printk(KERN_WARNING AUFS_NAME ": files\n"); |
0c5527e5 AM |
24613 | + lg_global_lock(files_lglock); |
24614 | + do_file_list_for_each_entry(sb, file) { | |
4a4d8108 AM |
24615 | + umode_t mode; |
24616 | + mode = file->f_dentry->d_inode->i_mode; | |
24617 | + if (!special_file(mode) || au_special_file(mode)) | |
1facf9fc | 24618 | + au_dpri_file(file); |
0c5527e5 AM |
24619 | + } while_file_list_for_each_entry; |
24620 | + lg_global_unlock(files_lglock); | |
e49829fe | 24621 | + printk(KERN_WARNING AUFS_NAME ": done\n"); |
1facf9fc | 24622 | + |
24623 | + au_plevel = plevel; | |
1facf9fc | 24624 | +} |
24625 | + | |
24626 | +/* ---------------------------------------------------------------------- */ | |
24627 | + | |
24628 | +/* module parameter */ | |
24629 | +static char *aufs_sysrq_key = "a"; | |
24630 | +module_param_named(sysrq, aufs_sysrq_key, charp, S_IRUGO); | |
24631 | +MODULE_PARM_DESC(sysrq, "MagicSysRq key for " AUFS_NAME); | |
24632 | + | |
0c5527e5 | 24633 | +static void au_sysrq(int key __maybe_unused) |
1facf9fc | 24634 | +{ |
1facf9fc | 24635 | + struct au_sbinfo *sbinfo; |
24636 | + | |
027c5e7a | 24637 | + lockdep_off(); |
53392da6 | 24638 | + au_sbilist_lock(); |
e49829fe | 24639 | + list_for_each_entry(sbinfo, &au_sbilist.head, si_list) |
1facf9fc | 24640 | + sysrq_sb(sbinfo->si_sb); |
53392da6 | 24641 | + au_sbilist_unlock(); |
027c5e7a | 24642 | + lockdep_on(); |
1facf9fc | 24643 | +} |
24644 | + | |
24645 | +static struct sysrq_key_op au_sysrq_op = { | |
24646 | + .handler = au_sysrq, | |
24647 | + .help_msg = "Aufs", | |
24648 | + .action_msg = "Aufs", | |
24649 | + .enable_mask = SYSRQ_ENABLE_DUMP | |
24650 | +}; | |
24651 | + | |
24652 | +/* ---------------------------------------------------------------------- */ | |
24653 | + | |
24654 | +int __init au_sysrq_init(void) | |
24655 | +{ | |
24656 | + int err; | |
24657 | + char key; | |
24658 | + | |
24659 | + err = -1; | |
24660 | + key = *aufs_sysrq_key; | |
24661 | + if ('a' <= key && key <= 'z') | |
24662 | + err = register_sysrq_key(key, &au_sysrq_op); | |
24663 | + if (unlikely(err)) | |
4a4d8108 | 24664 | + pr_err("err %d, sysrq=%c\n", err, key); |
1facf9fc | 24665 | + return err; |
24666 | +} | |
24667 | + | |
24668 | +void au_sysrq_fin(void) | |
24669 | +{ | |
24670 | + int err; | |
24671 | + err = unregister_sysrq_key(*aufs_sysrq_key, &au_sysrq_op); | |
24672 | + if (unlikely(err)) | |
4a4d8108 | 24673 | + pr_err("err %d (ignored)\n", err); |
1facf9fc | 24674 | +} |
7f207e10 AM |
24675 | diff -urN /usr/share/empty/fs/aufs/vdir.c linux/fs/aufs/vdir.c |
24676 | --- /usr/share/empty/fs/aufs/vdir.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 24677 | +++ linux/fs/aufs/vdir.c 2011-08-24 13:30:24.734646739 +0200 |
7f207e10 | 24678 | @@ -0,0 +1,886 @@ |
1facf9fc | 24679 | +/* |
027c5e7a | 24680 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 24681 | + * |
24682 | + * This program, aufs is free software; you can redistribute it and/or modify | |
24683 | + * it under the terms of the GNU General Public License as published by | |
24684 | + * the Free Software Foundation; either version 2 of the License, or | |
24685 | + * (at your option) any later version. | |
dece6358 AM |
24686 | + * |
24687 | + * This program is distributed in the hope that it will be useful, | |
24688 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
24689 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
24690 | + * GNU General Public License for more details. | |
24691 | + * | |
24692 | + * You should have received a copy of the GNU General Public License | |
24693 | + * along with this program; if not, write to the Free Software | |
24694 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 24695 | + */ |
24696 | + | |
24697 | +/* | |
24698 | + * virtual or vertical directory | |
24699 | + */ | |
24700 | + | |
dece6358 | 24701 | +#include <linux/hash.h> |
1facf9fc | 24702 | +#include "aufs.h" |
24703 | + | |
dece6358 | 24704 | +static unsigned int calc_size(int nlen) |
1facf9fc | 24705 | +{ |
dece6358 | 24706 | + return ALIGN(sizeof(struct au_vdir_de) + nlen, sizeof(ino_t)); |
1facf9fc | 24707 | +} |
24708 | + | |
24709 | +static int set_deblk_end(union au_vdir_deblk_p *p, | |
24710 | + union au_vdir_deblk_p *deblk_end) | |
24711 | +{ | |
24712 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) { | |
24713 | + p->de->de_str.len = 0; | |
24714 | + /* smp_mb(); */ | |
24715 | + return 0; | |
24716 | + } | |
24717 | + return -1; /* error */ | |
24718 | +} | |
24719 | + | |
24720 | +/* returns true or false */ | |
24721 | +static int is_deblk_end(union au_vdir_deblk_p *p, | |
24722 | + union au_vdir_deblk_p *deblk_end) | |
24723 | +{ | |
24724 | + if (calc_size(0) <= deblk_end->deblk - p->deblk) | |
24725 | + return !p->de->de_str.len; | |
24726 | + return 1; | |
24727 | +} | |
24728 | + | |
24729 | +static unsigned char *last_deblk(struct au_vdir *vdir) | |
24730 | +{ | |
24731 | + return vdir->vd_deblk[vdir->vd_nblk - 1]; | |
24732 | +} | |
24733 | + | |
24734 | +/* ---------------------------------------------------------------------- */ | |
24735 | + | |
1308ab2a | 24736 | +/* estimate the apropriate size for name hash table */ |
24737 | +unsigned int au_rdhash_est(loff_t sz) | |
24738 | +{ | |
24739 | + unsigned int n; | |
24740 | + | |
24741 | + n = UINT_MAX; | |
24742 | + sz >>= 10; | |
24743 | + if (sz < n) | |
24744 | + n = sz; | |
24745 | + if (sz < AUFS_RDHASH_DEF) | |
24746 | + n = AUFS_RDHASH_DEF; | |
4a4d8108 | 24747 | + /* pr_info("n %u\n", n); */ |
1308ab2a | 24748 | + return n; |
24749 | +} | |
24750 | + | |
1facf9fc | 24751 | +/* |
24752 | + * the allocated memory has to be freed by | |
dece6358 | 24753 | + * au_nhash_wh_free() or au_nhash_de_free(). |
1facf9fc | 24754 | + */ |
dece6358 | 24755 | +int au_nhash_alloc(struct au_nhash *nhash, unsigned int num_hash, gfp_t gfp) |
1facf9fc | 24756 | +{ |
1facf9fc | 24757 | + struct hlist_head *head; |
dece6358 | 24758 | + unsigned int u; |
1facf9fc | 24759 | + |
dece6358 AM |
24760 | + head = kmalloc(sizeof(*nhash->nh_head) * num_hash, gfp); |
24761 | + if (head) { | |
24762 | + nhash->nh_num = num_hash; | |
24763 | + nhash->nh_head = head; | |
24764 | + for (u = 0; u < num_hash; u++) | |
1facf9fc | 24765 | + INIT_HLIST_HEAD(head++); |
dece6358 | 24766 | + return 0; /* success */ |
1facf9fc | 24767 | + } |
1facf9fc | 24768 | + |
dece6358 | 24769 | + return -ENOMEM; |
1facf9fc | 24770 | +} |
24771 | + | |
dece6358 AM |
24772 | +static void nhash_count(struct hlist_head *head) |
24773 | +{ | |
24774 | +#if 0 | |
24775 | + unsigned long n; | |
24776 | + struct hlist_node *pos; | |
24777 | + | |
24778 | + n = 0; | |
24779 | + hlist_for_each(pos, head) | |
24780 | + n++; | |
4a4d8108 | 24781 | + pr_info("%lu\n", n); |
dece6358 AM |
24782 | +#endif |
24783 | +} | |
24784 | + | |
24785 | +static void au_nhash_wh_do_free(struct hlist_head *head) | |
1facf9fc | 24786 | +{ |
1facf9fc | 24787 | + struct au_vdir_wh *tpos; |
24788 | + struct hlist_node *pos, *node; | |
24789 | + | |
dece6358 AM |
24790 | + hlist_for_each_entry_safe(tpos, pos, node, head, wh_hash) { |
24791 | + /* hlist_del(pos); */ | |
24792 | + kfree(tpos); | |
1facf9fc | 24793 | + } |
24794 | +} | |
24795 | + | |
dece6358 | 24796 | +static void au_nhash_de_do_free(struct hlist_head *head) |
1facf9fc | 24797 | +{ |
dece6358 AM |
24798 | + struct au_vdir_dehstr *tpos; |
24799 | + struct hlist_node *pos, *node; | |
1facf9fc | 24800 | + |
dece6358 AM |
24801 | + hlist_for_each_entry_safe(tpos, pos, node, head, hash) { |
24802 | + /* hlist_del(pos); */ | |
4a4d8108 | 24803 | + au_cache_free_vdir_dehstr(tpos); |
1facf9fc | 24804 | + } |
1facf9fc | 24805 | +} |
24806 | + | |
dece6358 AM |
24807 | +static void au_nhash_do_free(struct au_nhash *nhash, |
24808 | + void (*free)(struct hlist_head *head)) | |
1facf9fc | 24809 | +{ |
1308ab2a | 24810 | + unsigned int n; |
1facf9fc | 24811 | + struct hlist_head *head; |
1facf9fc | 24812 | + |
dece6358 | 24813 | + n = nhash->nh_num; |
1308ab2a | 24814 | + if (!n) |
24815 | + return; | |
24816 | + | |
dece6358 | 24817 | + head = nhash->nh_head; |
1308ab2a | 24818 | + while (n-- > 0) { |
dece6358 AM |
24819 | + nhash_count(head); |
24820 | + free(head++); | |
1facf9fc | 24821 | + } |
dece6358 | 24822 | + kfree(nhash->nh_head); |
1facf9fc | 24823 | +} |
24824 | + | |
dece6358 | 24825 | +void au_nhash_wh_free(struct au_nhash *whlist) |
1facf9fc | 24826 | +{ |
dece6358 AM |
24827 | + au_nhash_do_free(whlist, au_nhash_wh_do_free); |
24828 | +} | |
1facf9fc | 24829 | + |
dece6358 AM |
24830 | +static void au_nhash_de_free(struct au_nhash *delist) |
24831 | +{ | |
24832 | + au_nhash_do_free(delist, au_nhash_de_do_free); | |
1facf9fc | 24833 | +} |
24834 | + | |
24835 | +/* ---------------------------------------------------------------------- */ | |
24836 | + | |
24837 | +int au_nhash_test_longer_wh(struct au_nhash *whlist, aufs_bindex_t btgt, | |
24838 | + int limit) | |
24839 | +{ | |
24840 | + int num; | |
24841 | + unsigned int u, n; | |
24842 | + struct hlist_head *head; | |
24843 | + struct au_vdir_wh *tpos; | |
24844 | + struct hlist_node *pos; | |
24845 | + | |
24846 | + num = 0; | |
24847 | + n = whlist->nh_num; | |
24848 | + head = whlist->nh_head; | |
1308ab2a | 24849 | + for (u = 0; u < n; u++, head++) |
1facf9fc | 24850 | + hlist_for_each_entry(tpos, pos, head, wh_hash) |
24851 | + if (tpos->wh_bindex == btgt && ++num > limit) | |
24852 | + return 1; | |
1facf9fc | 24853 | + return 0; |
24854 | +} | |
24855 | + | |
24856 | +static struct hlist_head *au_name_hash(struct au_nhash *nhash, | |
dece6358 | 24857 | + unsigned char *name, |
1facf9fc | 24858 | + unsigned int len) |
24859 | +{ | |
dece6358 AM |
24860 | + unsigned int v; |
24861 | + /* const unsigned int magic_bit = 12; */ | |
24862 | + | |
1308ab2a | 24863 | + AuDebugOn(!nhash->nh_num || !nhash->nh_head); |
24864 | + | |
dece6358 AM |
24865 | + v = 0; |
24866 | + while (len--) | |
24867 | + v += *name++; | |
24868 | + /* v = hash_long(v, magic_bit); */ | |
24869 | + v %= nhash->nh_num; | |
24870 | + return nhash->nh_head + v; | |
24871 | +} | |
24872 | + | |
24873 | +static int au_nhash_test_name(struct au_vdir_destr *str, const char *name, | |
24874 | + int nlen) | |
24875 | +{ | |
24876 | + return str->len == nlen && !memcmp(str->name, name, nlen); | |
1facf9fc | 24877 | +} |
24878 | + | |
24879 | +/* returns found or not */ | |
dece6358 | 24880 | +int au_nhash_test_known_wh(struct au_nhash *whlist, char *name, int nlen) |
1facf9fc | 24881 | +{ |
24882 | + struct hlist_head *head; | |
24883 | + struct au_vdir_wh *tpos; | |
24884 | + struct hlist_node *pos; | |
24885 | + struct au_vdir_destr *str; | |
24886 | + | |
dece6358 | 24887 | + head = au_name_hash(whlist, name, nlen); |
1facf9fc | 24888 | + hlist_for_each_entry(tpos, pos, head, wh_hash) { |
24889 | + str = &tpos->wh_str; | |
24890 | + AuDbg("%.*s\n", str->len, str->name); | |
dece6358 AM |
24891 | + if (au_nhash_test_name(str, name, nlen)) |
24892 | + return 1; | |
24893 | + } | |
24894 | + return 0; | |
24895 | +} | |
24896 | + | |
24897 | +/* returns found(true) or not */ | |
24898 | +static int test_known(struct au_nhash *delist, char *name, int nlen) | |
24899 | +{ | |
24900 | + struct hlist_head *head; | |
24901 | + struct au_vdir_dehstr *tpos; | |
24902 | + struct hlist_node *pos; | |
24903 | + struct au_vdir_destr *str; | |
24904 | + | |
24905 | + head = au_name_hash(delist, name, nlen); | |
24906 | + hlist_for_each_entry(tpos, pos, head, hash) { | |
24907 | + str = tpos->str; | |
24908 | + AuDbg("%.*s\n", str->len, str->name); | |
24909 | + if (au_nhash_test_name(str, name, nlen)) | |
1facf9fc | 24910 | + return 1; |
24911 | + } | |
24912 | + return 0; | |
24913 | +} | |
24914 | + | |
dece6358 AM |
24915 | +static void au_shwh_init_wh(struct au_vdir_wh *wh, ino_t ino, |
24916 | + unsigned char d_type) | |
24917 | +{ | |
24918 | +#ifdef CONFIG_AUFS_SHWH | |
24919 | + wh->wh_ino = ino; | |
24920 | + wh->wh_type = d_type; | |
24921 | +#endif | |
24922 | +} | |
24923 | + | |
24924 | +/* ---------------------------------------------------------------------- */ | |
24925 | + | |
24926 | +int au_nhash_append_wh(struct au_nhash *whlist, char *name, int nlen, ino_t ino, | |
24927 | + unsigned int d_type, aufs_bindex_t bindex, | |
24928 | + unsigned char shwh) | |
1facf9fc | 24929 | +{ |
24930 | + int err; | |
24931 | + struct au_vdir_destr *str; | |
24932 | + struct au_vdir_wh *wh; | |
24933 | + | |
dece6358 | 24934 | + AuDbg("%.*s\n", nlen, name); |
1308ab2a | 24935 | + AuDebugOn(!whlist->nh_num || !whlist->nh_head); |
24936 | + | |
1facf9fc | 24937 | + err = -ENOMEM; |
dece6358 | 24938 | + wh = kmalloc(sizeof(*wh) + nlen, GFP_NOFS); |
1facf9fc | 24939 | + if (unlikely(!wh)) |
24940 | + goto out; | |
24941 | + | |
24942 | + err = 0; | |
24943 | + wh->wh_bindex = bindex; | |
dece6358 AM |
24944 | + if (shwh) |
24945 | + au_shwh_init_wh(wh, ino, d_type); | |
1facf9fc | 24946 | + str = &wh->wh_str; |
dece6358 AM |
24947 | + str->len = nlen; |
24948 | + memcpy(str->name, name, nlen); | |
24949 | + hlist_add_head(&wh->wh_hash, au_name_hash(whlist, name, nlen)); | |
1facf9fc | 24950 | + /* smp_mb(); */ |
24951 | + | |
4f0767ce | 24952 | +out: |
1facf9fc | 24953 | + return err; |
24954 | +} | |
24955 | + | |
1facf9fc | 24956 | +static int append_deblk(struct au_vdir *vdir) |
24957 | +{ | |
24958 | + int err; | |
dece6358 | 24959 | + unsigned long ul; |
1facf9fc | 24960 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; |
24961 | + union au_vdir_deblk_p p, deblk_end; | |
24962 | + unsigned char **o; | |
24963 | + | |
24964 | + err = -ENOMEM; | |
dece6358 AM |
24965 | + o = krealloc(vdir->vd_deblk, sizeof(*o) * (vdir->vd_nblk + 1), |
24966 | + GFP_NOFS); | |
1facf9fc | 24967 | + if (unlikely(!o)) |
24968 | + goto out; | |
24969 | + | |
24970 | + vdir->vd_deblk = o; | |
24971 | + p.deblk = kmalloc(deblk_sz, GFP_NOFS); | |
24972 | + if (p.deblk) { | |
24973 | + ul = vdir->vd_nblk++; | |
24974 | + vdir->vd_deblk[ul] = p.deblk; | |
24975 | + vdir->vd_last.ul = ul; | |
24976 | + vdir->vd_last.p.deblk = p.deblk; | |
24977 | + deblk_end.deblk = p.deblk + deblk_sz; | |
24978 | + err = set_deblk_end(&p, &deblk_end); | |
24979 | + } | |
24980 | + | |
4f0767ce | 24981 | +out: |
1facf9fc | 24982 | + return err; |
24983 | +} | |
24984 | + | |
dece6358 AM |
24985 | +static int append_de(struct au_vdir *vdir, char *name, int nlen, ino_t ino, |
24986 | + unsigned int d_type, struct au_nhash *delist) | |
24987 | +{ | |
24988 | + int err; | |
24989 | + unsigned int sz; | |
24990 | + const unsigned int deblk_sz = vdir->vd_deblk_sz; | |
24991 | + union au_vdir_deblk_p p, *room, deblk_end; | |
24992 | + struct au_vdir_dehstr *dehstr; | |
24993 | + | |
24994 | + p.deblk = last_deblk(vdir); | |
24995 | + deblk_end.deblk = p.deblk + deblk_sz; | |
24996 | + room = &vdir->vd_last.p; | |
24997 | + AuDebugOn(room->deblk < p.deblk || deblk_end.deblk <= room->deblk | |
24998 | + || !is_deblk_end(room, &deblk_end)); | |
24999 | + | |
25000 | + sz = calc_size(nlen); | |
25001 | + if (unlikely(sz > deblk_end.deblk - room->deblk)) { | |
25002 | + err = append_deblk(vdir); | |
25003 | + if (unlikely(err)) | |
25004 | + goto out; | |
25005 | + | |
25006 | + p.deblk = last_deblk(vdir); | |
25007 | + deblk_end.deblk = p.deblk + deblk_sz; | |
25008 | + /* smp_mb(); */ | |
25009 | + AuDebugOn(room->deblk != p.deblk); | |
25010 | + } | |
25011 | + | |
25012 | + err = -ENOMEM; | |
4a4d8108 | 25013 | + dehstr = au_cache_alloc_vdir_dehstr(); |
dece6358 AM |
25014 | + if (unlikely(!dehstr)) |
25015 | + goto out; | |
25016 | + | |
25017 | + dehstr->str = &room->de->de_str; | |
25018 | + hlist_add_head(&dehstr->hash, au_name_hash(delist, name, nlen)); | |
25019 | + room->de->de_ino = ino; | |
25020 | + room->de->de_type = d_type; | |
25021 | + room->de->de_str.len = nlen; | |
25022 | + memcpy(room->de->de_str.name, name, nlen); | |
25023 | + | |
25024 | + err = 0; | |
25025 | + room->deblk += sz; | |
25026 | + if (unlikely(set_deblk_end(room, &deblk_end))) | |
25027 | + err = append_deblk(vdir); | |
25028 | + /* smp_mb(); */ | |
25029 | + | |
4f0767ce | 25030 | +out: |
dece6358 AM |
25031 | + return err; |
25032 | +} | |
25033 | + | |
25034 | +/* ---------------------------------------------------------------------- */ | |
25035 | + | |
25036 | +void au_vdir_free(struct au_vdir *vdir) | |
25037 | +{ | |
25038 | + unsigned char **deblk; | |
25039 | + | |
25040 | + deblk = vdir->vd_deblk; | |
25041 | + while (vdir->vd_nblk--) | |
25042 | + kfree(*deblk++); | |
25043 | + kfree(vdir->vd_deblk); | |
25044 | + au_cache_free_vdir(vdir); | |
25045 | +} | |
25046 | + | |
1308ab2a | 25047 | +static struct au_vdir *alloc_vdir(struct file *file) |
1facf9fc | 25048 | +{ |
25049 | + struct au_vdir *vdir; | |
1308ab2a | 25050 | + struct super_block *sb; |
1facf9fc | 25051 | + int err; |
25052 | + | |
1308ab2a | 25053 | + sb = file->f_dentry->d_sb; |
dece6358 AM |
25054 | + SiMustAnyLock(sb); |
25055 | + | |
1facf9fc | 25056 | + err = -ENOMEM; |
25057 | + vdir = au_cache_alloc_vdir(); | |
25058 | + if (unlikely(!vdir)) | |
25059 | + goto out; | |
25060 | + | |
25061 | + vdir->vd_deblk = kzalloc(sizeof(*vdir->vd_deblk), GFP_NOFS); | |
25062 | + if (unlikely(!vdir->vd_deblk)) | |
25063 | + goto out_free; | |
25064 | + | |
25065 | + vdir->vd_deblk_sz = au_sbi(sb)->si_rdblk; | |
1308ab2a | 25066 | + if (!vdir->vd_deblk_sz) { |
25067 | + /* estimate the apropriate size for deblk */ | |
25068 | + vdir->vd_deblk_sz = au_dir_size(file, /*dentry*/NULL); | |
4a4d8108 | 25069 | + /* pr_info("vd_deblk_sz %u\n", vdir->vd_deblk_sz); */ |
1308ab2a | 25070 | + } |
1facf9fc | 25071 | + vdir->vd_nblk = 0; |
25072 | + vdir->vd_version = 0; | |
25073 | + vdir->vd_jiffy = 0; | |
25074 | + err = append_deblk(vdir); | |
25075 | + if (!err) | |
25076 | + return vdir; /* success */ | |
25077 | + | |
25078 | + kfree(vdir->vd_deblk); | |
25079 | + | |
4f0767ce | 25080 | +out_free: |
1facf9fc | 25081 | + au_cache_free_vdir(vdir); |
4f0767ce | 25082 | +out: |
1facf9fc | 25083 | + vdir = ERR_PTR(err); |
25084 | + return vdir; | |
25085 | +} | |
25086 | + | |
25087 | +static int reinit_vdir(struct au_vdir *vdir) | |
25088 | +{ | |
25089 | + int err; | |
25090 | + union au_vdir_deblk_p p, deblk_end; | |
25091 | + | |
25092 | + while (vdir->vd_nblk > 1) { | |
25093 | + kfree(vdir->vd_deblk[vdir->vd_nblk - 1]); | |
25094 | + /* vdir->vd_deblk[vdir->vd_nblk - 1] = NULL; */ | |
25095 | + vdir->vd_nblk--; | |
25096 | + } | |
25097 | + p.deblk = vdir->vd_deblk[0]; | |
25098 | + deblk_end.deblk = p.deblk + vdir->vd_deblk_sz; | |
25099 | + err = set_deblk_end(&p, &deblk_end); | |
25100 | + /* keep vd_dblk_sz */ | |
25101 | + vdir->vd_last.ul = 0; | |
25102 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
25103 | + vdir->vd_version = 0; | |
25104 | + vdir->vd_jiffy = 0; | |
25105 | + /* smp_mb(); */ | |
25106 | + return err; | |
25107 | +} | |
25108 | + | |
25109 | +/* ---------------------------------------------------------------------- */ | |
25110 | + | |
1facf9fc | 25111 | +#define AuFillVdir_CALLED 1 |
25112 | +#define AuFillVdir_WHABLE (1 << 1) | |
dece6358 | 25113 | +#define AuFillVdir_SHWH (1 << 2) |
1facf9fc | 25114 | +#define au_ftest_fillvdir(flags, name) ((flags) & AuFillVdir_##name) |
7f207e10 AM |
25115 | +#define au_fset_fillvdir(flags, name) \ |
25116 | + do { (flags) |= AuFillVdir_##name; } while (0) | |
25117 | +#define au_fclr_fillvdir(flags, name) \ | |
25118 | + do { (flags) &= ~AuFillVdir_##name; } while (0) | |
1facf9fc | 25119 | + |
dece6358 AM |
25120 | +#ifndef CONFIG_AUFS_SHWH |
25121 | +#undef AuFillVdir_SHWH | |
25122 | +#define AuFillVdir_SHWH 0 | |
25123 | +#endif | |
25124 | + | |
1facf9fc | 25125 | +struct fillvdir_arg { |
25126 | + struct file *file; | |
25127 | + struct au_vdir *vdir; | |
dece6358 AM |
25128 | + struct au_nhash delist; |
25129 | + struct au_nhash whlist; | |
1facf9fc | 25130 | + aufs_bindex_t bindex; |
25131 | + unsigned int flags; | |
25132 | + int err; | |
25133 | +}; | |
25134 | + | |
dece6358 | 25135 | +static int fillvdir(void *__arg, const char *__name, int nlen, |
1facf9fc | 25136 | + loff_t offset __maybe_unused, u64 h_ino, |
25137 | + unsigned int d_type) | |
25138 | +{ | |
25139 | + struct fillvdir_arg *arg = __arg; | |
25140 | + char *name = (void *)__name; | |
25141 | + struct super_block *sb; | |
1facf9fc | 25142 | + ino_t ino; |
dece6358 | 25143 | + const unsigned char shwh = !!au_ftest_fillvdir(arg->flags, SHWH); |
1facf9fc | 25144 | + |
1facf9fc | 25145 | + arg->err = 0; |
dece6358 | 25146 | + sb = arg->file->f_dentry->d_sb; |
1facf9fc | 25147 | + au_fset_fillvdir(arg->flags, CALLED); |
25148 | + /* smp_mb(); */ | |
dece6358 | 25149 | + if (nlen <= AUFS_WH_PFX_LEN |
1facf9fc | 25150 | + || memcmp(name, AUFS_WH_PFX, AUFS_WH_PFX_LEN)) { |
dece6358 AM |
25151 | + if (test_known(&arg->delist, name, nlen) |
25152 | + || au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
25153 | + goto out; /* already exists or whiteouted */ | |
1facf9fc | 25154 | + |
25155 | + sb = arg->file->f_dentry->d_sb; | |
dece6358 | 25156 | + arg->err = au_ino(sb, arg->bindex, h_ino, d_type, &ino); |
4a4d8108 AM |
25157 | + if (!arg->err) { |
25158 | + if (unlikely(nlen > AUFS_MAX_NAMELEN)) | |
25159 | + d_type = DT_UNKNOWN; | |
dece6358 AM |
25160 | + arg->err = append_de(arg->vdir, name, nlen, ino, |
25161 | + d_type, &arg->delist); | |
4a4d8108 | 25162 | + } |
1facf9fc | 25163 | + } else if (au_ftest_fillvdir(arg->flags, WHABLE)) { |
25164 | + name += AUFS_WH_PFX_LEN; | |
dece6358 AM |
25165 | + nlen -= AUFS_WH_PFX_LEN; |
25166 | + if (au_nhash_test_known_wh(&arg->whlist, name, nlen)) | |
25167 | + goto out; /* already whiteouted */ | |
1facf9fc | 25168 | + |
dece6358 AM |
25169 | + if (shwh) |
25170 | + arg->err = au_wh_ino(sb, arg->bindex, h_ino, d_type, | |
25171 | + &ino); | |
4a4d8108 AM |
25172 | + if (!arg->err) { |
25173 | + if (nlen <= AUFS_MAX_NAMELEN + AUFS_WH_PFX_LEN) | |
25174 | + d_type = DT_UNKNOWN; | |
1facf9fc | 25175 | + arg->err = au_nhash_append_wh |
dece6358 AM |
25176 | + (&arg->whlist, name, nlen, ino, d_type, |
25177 | + arg->bindex, shwh); | |
4a4d8108 | 25178 | + } |
1facf9fc | 25179 | + } |
25180 | + | |
4f0767ce | 25181 | +out: |
1facf9fc | 25182 | + if (!arg->err) |
25183 | + arg->vdir->vd_jiffy = jiffies; | |
25184 | + /* smp_mb(); */ | |
25185 | + AuTraceErr(arg->err); | |
25186 | + return arg->err; | |
25187 | +} | |
25188 | + | |
dece6358 AM |
25189 | +static int au_handle_shwh(struct super_block *sb, struct au_vdir *vdir, |
25190 | + struct au_nhash *whlist, struct au_nhash *delist) | |
25191 | +{ | |
25192 | +#ifdef CONFIG_AUFS_SHWH | |
25193 | + int err; | |
25194 | + unsigned int nh, u; | |
25195 | + struct hlist_head *head; | |
25196 | + struct au_vdir_wh *tpos; | |
25197 | + struct hlist_node *pos, *n; | |
25198 | + char *p, *o; | |
25199 | + struct au_vdir_destr *destr; | |
25200 | + | |
25201 | + AuDebugOn(!au_opt_test(au_mntflags(sb), SHWH)); | |
25202 | + | |
25203 | + err = -ENOMEM; | |
4a4d8108 | 25204 | + o = p = __getname_gfp(GFP_NOFS); |
dece6358 AM |
25205 | + if (unlikely(!p)) |
25206 | + goto out; | |
25207 | + | |
25208 | + err = 0; | |
25209 | + nh = whlist->nh_num; | |
25210 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
25211 | + p += AUFS_WH_PFX_LEN; | |
25212 | + for (u = 0; u < nh; u++) { | |
25213 | + head = whlist->nh_head + u; | |
25214 | + hlist_for_each_entry_safe(tpos, pos, n, head, wh_hash) { | |
25215 | + destr = &tpos->wh_str; | |
25216 | + memcpy(p, destr->name, destr->len); | |
25217 | + err = append_de(vdir, o, destr->len + AUFS_WH_PFX_LEN, | |
25218 | + tpos->wh_ino, tpos->wh_type, delist); | |
25219 | + if (unlikely(err)) | |
25220 | + break; | |
25221 | + } | |
25222 | + } | |
25223 | + | |
25224 | + __putname(o); | |
25225 | + | |
4f0767ce | 25226 | +out: |
dece6358 AM |
25227 | + AuTraceErr(err); |
25228 | + return err; | |
25229 | +#else | |
25230 | + return 0; | |
25231 | +#endif | |
25232 | +} | |
25233 | + | |
1facf9fc | 25234 | +static int au_do_read_vdir(struct fillvdir_arg *arg) |
25235 | +{ | |
25236 | + int err; | |
dece6358 | 25237 | + unsigned int rdhash; |
1facf9fc | 25238 | + loff_t offset; |
dece6358 AM |
25239 | + aufs_bindex_t bend, bindex, bstart; |
25240 | + unsigned char shwh; | |
1facf9fc | 25241 | + struct file *hf, *file; |
25242 | + struct super_block *sb; | |
25243 | + | |
1facf9fc | 25244 | + file = arg->file; |
25245 | + sb = file->f_dentry->d_sb; | |
dece6358 AM |
25246 | + SiMustAnyLock(sb); |
25247 | + | |
25248 | + rdhash = au_sbi(sb)->si_rdhash; | |
1308ab2a | 25249 | + if (!rdhash) |
25250 | + rdhash = au_rdhash_est(au_dir_size(file, /*dentry*/NULL)); | |
dece6358 AM |
25251 | + err = au_nhash_alloc(&arg->delist, rdhash, GFP_NOFS); |
25252 | + if (unlikely(err)) | |
1facf9fc | 25253 | + goto out; |
dece6358 AM |
25254 | + err = au_nhash_alloc(&arg->whlist, rdhash, GFP_NOFS); |
25255 | + if (unlikely(err)) | |
1facf9fc | 25256 | + goto out_delist; |
25257 | + | |
25258 | + err = 0; | |
25259 | + arg->flags = 0; | |
dece6358 AM |
25260 | + shwh = 0; |
25261 | + if (au_opt_test(au_mntflags(sb), SHWH)) { | |
25262 | + shwh = 1; | |
25263 | + au_fset_fillvdir(arg->flags, SHWH); | |
25264 | + } | |
25265 | + bstart = au_fbstart(file); | |
4a4d8108 | 25266 | + bend = au_fbend_dir(file); |
dece6358 | 25267 | + for (bindex = bstart; !err && bindex <= bend; bindex++) { |
4a4d8108 | 25268 | + hf = au_hf_dir(file, bindex); |
1facf9fc | 25269 | + if (!hf) |
25270 | + continue; | |
25271 | + | |
25272 | + offset = vfsub_llseek(hf, 0, SEEK_SET); | |
25273 | + err = offset; | |
25274 | + if (unlikely(offset)) | |
25275 | + break; | |
25276 | + | |
25277 | + arg->bindex = bindex; | |
25278 | + au_fclr_fillvdir(arg->flags, WHABLE); | |
dece6358 AM |
25279 | + if (shwh |
25280 | + || (bindex != bend | |
25281 | + && au_br_whable(au_sbr_perm(sb, bindex)))) | |
1facf9fc | 25282 | + au_fset_fillvdir(arg->flags, WHABLE); |
25283 | + do { | |
25284 | + arg->err = 0; | |
25285 | + au_fclr_fillvdir(arg->flags, CALLED); | |
25286 | + /* smp_mb(); */ | |
25287 | + err = vfsub_readdir(hf, fillvdir, arg); | |
25288 | + if (err >= 0) | |
25289 | + err = arg->err; | |
25290 | + } while (!err && au_ftest_fillvdir(arg->flags, CALLED)); | |
25291 | + } | |
dece6358 AM |
25292 | + |
25293 | + if (!err && shwh) | |
25294 | + err = au_handle_shwh(sb, arg->vdir, &arg->whlist, &arg->delist); | |
25295 | + | |
25296 | + au_nhash_wh_free(&arg->whlist); | |
1facf9fc | 25297 | + |
4f0767ce | 25298 | +out_delist: |
dece6358 | 25299 | + au_nhash_de_free(&arg->delist); |
4f0767ce | 25300 | +out: |
1facf9fc | 25301 | + return err; |
25302 | +} | |
25303 | + | |
25304 | +static int read_vdir(struct file *file, int may_read) | |
25305 | +{ | |
25306 | + int err; | |
25307 | + unsigned long expire; | |
25308 | + unsigned char do_read; | |
25309 | + struct fillvdir_arg arg; | |
25310 | + struct inode *inode; | |
25311 | + struct au_vdir *vdir, *allocated; | |
25312 | + | |
25313 | + err = 0; | |
25314 | + inode = file->f_dentry->d_inode; | |
25315 | + IMustLock(inode); | |
dece6358 AM |
25316 | + SiMustAnyLock(inode->i_sb); |
25317 | + | |
1facf9fc | 25318 | + allocated = NULL; |
25319 | + do_read = 0; | |
25320 | + expire = au_sbi(inode->i_sb)->si_rdcache; | |
25321 | + vdir = au_ivdir(inode); | |
25322 | + if (!vdir) { | |
25323 | + do_read = 1; | |
1308ab2a | 25324 | + vdir = alloc_vdir(file); |
1facf9fc | 25325 | + err = PTR_ERR(vdir); |
25326 | + if (IS_ERR(vdir)) | |
25327 | + goto out; | |
25328 | + err = 0; | |
25329 | + allocated = vdir; | |
25330 | + } else if (may_read | |
25331 | + && (inode->i_version != vdir->vd_version | |
25332 | + || time_after(jiffies, vdir->vd_jiffy + expire))) { | |
25333 | + do_read = 1; | |
25334 | + err = reinit_vdir(vdir); | |
25335 | + if (unlikely(err)) | |
25336 | + goto out; | |
25337 | + } | |
25338 | + | |
25339 | + if (!do_read) | |
25340 | + return 0; /* success */ | |
25341 | + | |
25342 | + arg.file = file; | |
25343 | + arg.vdir = vdir; | |
25344 | + err = au_do_read_vdir(&arg); | |
25345 | + if (!err) { | |
25346 | + /* file->f_pos = 0; */ | |
25347 | + vdir->vd_version = inode->i_version; | |
25348 | + vdir->vd_last.ul = 0; | |
25349 | + vdir->vd_last.p.deblk = vdir->vd_deblk[0]; | |
25350 | + if (allocated) | |
25351 | + au_set_ivdir(inode, allocated); | |
25352 | + } else if (allocated) | |
25353 | + au_vdir_free(allocated); | |
25354 | + | |
4f0767ce | 25355 | +out: |
1facf9fc | 25356 | + return err; |
25357 | +} | |
25358 | + | |
25359 | +static int copy_vdir(struct au_vdir *tgt, struct au_vdir *src) | |
25360 | +{ | |
25361 | + int err, rerr; | |
25362 | + unsigned long ul, n; | |
25363 | + const unsigned int deblk_sz = src->vd_deblk_sz; | |
25364 | + | |
25365 | + AuDebugOn(tgt->vd_nblk != 1); | |
25366 | + | |
25367 | + err = -ENOMEM; | |
25368 | + if (tgt->vd_nblk < src->vd_nblk) { | |
25369 | + unsigned char **p; | |
25370 | + | |
dece6358 AM |
25371 | + p = krealloc(tgt->vd_deblk, sizeof(*p) * src->vd_nblk, |
25372 | + GFP_NOFS); | |
1facf9fc | 25373 | + if (unlikely(!p)) |
25374 | + goto out; | |
25375 | + tgt->vd_deblk = p; | |
25376 | + } | |
25377 | + | |
1308ab2a | 25378 | + if (tgt->vd_deblk_sz != deblk_sz) { |
25379 | + unsigned char *p; | |
25380 | + | |
25381 | + tgt->vd_deblk_sz = deblk_sz; | |
25382 | + p = krealloc(tgt->vd_deblk[0], deblk_sz, GFP_NOFS); | |
25383 | + if (unlikely(!p)) | |
25384 | + goto out; | |
25385 | + tgt->vd_deblk[0] = p; | |
25386 | + } | |
1facf9fc | 25387 | + memcpy(tgt->vd_deblk[0], src->vd_deblk[0], deblk_sz); |
1facf9fc | 25388 | + tgt->vd_version = src->vd_version; |
25389 | + tgt->vd_jiffy = src->vd_jiffy; | |
25390 | + | |
25391 | + n = src->vd_nblk; | |
25392 | + for (ul = 1; ul < n; ul++) { | |
dece6358 AM |
25393 | + tgt->vd_deblk[ul] = kmemdup(src->vd_deblk[ul], deblk_sz, |
25394 | + GFP_NOFS); | |
25395 | + if (unlikely(!tgt->vd_deblk[ul])) | |
1facf9fc | 25396 | + goto out; |
1308ab2a | 25397 | + tgt->vd_nblk++; |
1facf9fc | 25398 | + } |
1308ab2a | 25399 | + tgt->vd_nblk = n; |
25400 | + tgt->vd_last.ul = tgt->vd_last.ul; | |
25401 | + tgt->vd_last.p.deblk = tgt->vd_deblk[tgt->vd_last.ul]; | |
25402 | + tgt->vd_last.p.deblk += src->vd_last.p.deblk | |
25403 | + - src->vd_deblk[src->vd_last.ul]; | |
1facf9fc | 25404 | + /* smp_mb(); */ |
25405 | + return 0; /* success */ | |
25406 | + | |
4f0767ce | 25407 | +out: |
1facf9fc | 25408 | + rerr = reinit_vdir(tgt); |
25409 | + BUG_ON(rerr); | |
25410 | + return err; | |
25411 | +} | |
25412 | + | |
25413 | +int au_vdir_init(struct file *file) | |
25414 | +{ | |
25415 | + int err; | |
25416 | + struct inode *inode; | |
25417 | + struct au_vdir *vdir_cache, *allocated; | |
25418 | + | |
25419 | + err = read_vdir(file, !file->f_pos); | |
25420 | + if (unlikely(err)) | |
25421 | + goto out; | |
25422 | + | |
25423 | + allocated = NULL; | |
25424 | + vdir_cache = au_fvdir_cache(file); | |
25425 | + if (!vdir_cache) { | |
1308ab2a | 25426 | + vdir_cache = alloc_vdir(file); |
1facf9fc | 25427 | + err = PTR_ERR(vdir_cache); |
25428 | + if (IS_ERR(vdir_cache)) | |
25429 | + goto out; | |
25430 | + allocated = vdir_cache; | |
25431 | + } else if (!file->f_pos && vdir_cache->vd_version != file->f_version) { | |
25432 | + err = reinit_vdir(vdir_cache); | |
25433 | + if (unlikely(err)) | |
25434 | + goto out; | |
25435 | + } else | |
25436 | + return 0; /* success */ | |
25437 | + | |
25438 | + inode = file->f_dentry->d_inode; | |
25439 | + err = copy_vdir(vdir_cache, au_ivdir(inode)); | |
25440 | + if (!err) { | |
25441 | + file->f_version = inode->i_version; | |
25442 | + if (allocated) | |
25443 | + au_set_fvdir_cache(file, allocated); | |
25444 | + } else if (allocated) | |
25445 | + au_vdir_free(allocated); | |
25446 | + | |
4f0767ce | 25447 | +out: |
1facf9fc | 25448 | + return err; |
25449 | +} | |
25450 | + | |
25451 | +static loff_t calc_offset(struct au_vdir *vdir) | |
25452 | +{ | |
25453 | + loff_t offset; | |
25454 | + union au_vdir_deblk_p p; | |
25455 | + | |
25456 | + p.deblk = vdir->vd_deblk[vdir->vd_last.ul]; | |
25457 | + offset = vdir->vd_last.p.deblk - p.deblk; | |
25458 | + offset += vdir->vd_deblk_sz * vdir->vd_last.ul; | |
25459 | + return offset; | |
25460 | +} | |
25461 | + | |
25462 | +/* returns true or false */ | |
25463 | +static int seek_vdir(struct file *file) | |
25464 | +{ | |
25465 | + int valid; | |
25466 | + unsigned int deblk_sz; | |
25467 | + unsigned long ul, n; | |
25468 | + loff_t offset; | |
25469 | + union au_vdir_deblk_p p, deblk_end; | |
25470 | + struct au_vdir *vdir_cache; | |
25471 | + | |
25472 | + valid = 1; | |
25473 | + vdir_cache = au_fvdir_cache(file); | |
25474 | + offset = calc_offset(vdir_cache); | |
25475 | + AuDbg("offset %lld\n", offset); | |
25476 | + if (file->f_pos == offset) | |
25477 | + goto out; | |
25478 | + | |
25479 | + vdir_cache->vd_last.ul = 0; | |
25480 | + vdir_cache->vd_last.p.deblk = vdir_cache->vd_deblk[0]; | |
25481 | + if (!file->f_pos) | |
25482 | + goto out; | |
25483 | + | |
25484 | + valid = 0; | |
25485 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
25486 | + ul = div64_u64(file->f_pos, deblk_sz); | |
25487 | + AuDbg("ul %lu\n", ul); | |
25488 | + if (ul >= vdir_cache->vd_nblk) | |
25489 | + goto out; | |
25490 | + | |
25491 | + n = vdir_cache->vd_nblk; | |
25492 | + for (; ul < n; ul++) { | |
25493 | + p.deblk = vdir_cache->vd_deblk[ul]; | |
25494 | + deblk_end.deblk = p.deblk + deblk_sz; | |
25495 | + offset = ul; | |
25496 | + offset *= deblk_sz; | |
25497 | + while (!is_deblk_end(&p, &deblk_end) && offset < file->f_pos) { | |
25498 | + unsigned int l; | |
25499 | + | |
25500 | + l = calc_size(p.de->de_str.len); | |
25501 | + offset += l; | |
25502 | + p.deblk += l; | |
25503 | + } | |
25504 | + if (!is_deblk_end(&p, &deblk_end)) { | |
25505 | + valid = 1; | |
25506 | + vdir_cache->vd_last.ul = ul; | |
25507 | + vdir_cache->vd_last.p = p; | |
25508 | + break; | |
25509 | + } | |
25510 | + } | |
25511 | + | |
4f0767ce | 25512 | +out: |
1facf9fc | 25513 | + /* smp_mb(); */ |
25514 | + AuTraceErr(!valid); | |
25515 | + return valid; | |
25516 | +} | |
25517 | + | |
25518 | +int au_vdir_fill_de(struct file *file, void *dirent, filldir_t filldir) | |
25519 | +{ | |
25520 | + int err; | |
25521 | + unsigned int l, deblk_sz; | |
25522 | + union au_vdir_deblk_p deblk_end; | |
25523 | + struct au_vdir *vdir_cache; | |
25524 | + struct au_vdir_de *de; | |
25525 | + | |
25526 | + vdir_cache = au_fvdir_cache(file); | |
25527 | + if (!seek_vdir(file)) | |
25528 | + return 0; | |
25529 | + | |
25530 | + deblk_sz = vdir_cache->vd_deblk_sz; | |
25531 | + while (1) { | |
25532 | + deblk_end.deblk = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
25533 | + deblk_end.deblk += deblk_sz; | |
25534 | + while (!is_deblk_end(&vdir_cache->vd_last.p, &deblk_end)) { | |
25535 | + de = vdir_cache->vd_last.p.de; | |
25536 | + AuDbg("%.*s, off%lld, i%lu, dt%d\n", | |
25537 | + de->de_str.len, de->de_str.name, file->f_pos, | |
25538 | + (unsigned long)de->de_ino, de->de_type); | |
25539 | + err = filldir(dirent, de->de_str.name, de->de_str.len, | |
25540 | + file->f_pos, de->de_ino, de->de_type); | |
25541 | + if (unlikely(err)) { | |
25542 | + AuTraceErr(err); | |
25543 | + /* todo: ignore the error caused by udba? */ | |
25544 | + /* return err; */ | |
25545 | + return 0; | |
25546 | + } | |
25547 | + | |
25548 | + l = calc_size(de->de_str.len); | |
25549 | + vdir_cache->vd_last.p.deblk += l; | |
25550 | + file->f_pos += l; | |
25551 | + } | |
25552 | + if (vdir_cache->vd_last.ul < vdir_cache->vd_nblk - 1) { | |
25553 | + vdir_cache->vd_last.ul++; | |
25554 | + vdir_cache->vd_last.p.deblk | |
25555 | + = vdir_cache->vd_deblk[vdir_cache->vd_last.ul]; | |
25556 | + file->f_pos = deblk_sz * vdir_cache->vd_last.ul; | |
25557 | + continue; | |
25558 | + } | |
25559 | + break; | |
25560 | + } | |
25561 | + | |
25562 | + /* smp_mb(); */ | |
25563 | + return 0; | |
25564 | +} | |
7f207e10 AM |
25565 | diff -urN /usr/share/empty/fs/aufs/vfsub.c linux/fs/aufs/vfsub.c |
25566 | --- /usr/share/empty/fs/aufs/vfsub.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
25567 | +++ linux/fs/aufs/vfsub.c 2011-08-24 13:30:24.734646739 +0200 |
25568 | @@ -0,0 +1,836 @@ | |
1facf9fc | 25569 | +/* |
027c5e7a | 25570 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 25571 | + * |
25572 | + * This program, aufs is free software; you can redistribute it and/or modify | |
25573 | + * it under the terms of the GNU General Public License as published by | |
25574 | + * the Free Software Foundation; either version 2 of the License, or | |
25575 | + * (at your option) any later version. | |
dece6358 AM |
25576 | + * |
25577 | + * This program is distributed in the hope that it will be useful, | |
25578 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
25579 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
25580 | + * GNU General Public License for more details. | |
25581 | + * | |
25582 | + * You should have received a copy of the GNU General Public License | |
25583 | + * along with this program; if not, write to the Free Software | |
25584 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 25585 | + */ |
25586 | + | |
25587 | +/* | |
25588 | + * sub-routines for VFS | |
25589 | + */ | |
25590 | + | |
4a4d8108 | 25591 | +#include <linux/file.h> |
1308ab2a | 25592 | +#include <linux/ima.h> |
dece6358 AM |
25593 | +#include <linux/namei.h> |
25594 | +#include <linux/security.h> | |
25595 | +#include <linux/splice.h> | |
1facf9fc | 25596 | +#include <linux/uaccess.h> |
25597 | +#include "aufs.h" | |
25598 | + | |
25599 | +int vfsub_update_h_iattr(struct path *h_path, int *did) | |
25600 | +{ | |
25601 | + int err; | |
25602 | + struct kstat st; | |
25603 | + struct super_block *h_sb; | |
25604 | + | |
25605 | + /* for remote fs, leave work for its getattr or d_revalidate */ | |
25606 | + /* for bad i_attr fs, handle them in aufs_getattr() */ | |
25607 | + /* still some fs may acquire i_mutex. we need to skip them */ | |
25608 | + err = 0; | |
25609 | + if (!did) | |
25610 | + did = &err; | |
25611 | + h_sb = h_path->dentry->d_sb; | |
25612 | + *did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb)); | |
25613 | + if (*did) | |
25614 | + err = vfs_getattr(h_path->mnt, h_path->dentry, &st); | |
25615 | + | |
25616 | + return err; | |
25617 | +} | |
25618 | + | |
25619 | +/* ---------------------------------------------------------------------- */ | |
25620 | + | |
4a4d8108 | 25621 | +struct file *vfsub_dentry_open(struct path *path, int flags) |
1308ab2a | 25622 | +{ |
25623 | + struct file *file; | |
25624 | + | |
4a4d8108 | 25625 | + path_get(path); |
0c5527e5 | 25626 | + file = dentry_open(path->dentry, path->mnt, |
2cbb1c4b | 25627 | + flags /* | __FMODE_NONOTIFY */, |
7f207e10 | 25628 | + current_cred()); |
2cbb1c4b JR |
25629 | + if (!IS_ERR_OR_NULL(file) |
25630 | + && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ) | |
25631 | + i_readcount_inc(path->dentry->d_inode); | |
4a4d8108 | 25632 | + |
1308ab2a | 25633 | + return file; |
25634 | +} | |
25635 | + | |
1facf9fc | 25636 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode) |
25637 | +{ | |
25638 | + struct file *file; | |
25639 | + | |
2cbb1c4b | 25640 | + lockdep_off(); |
7f207e10 | 25641 | + file = filp_open(path, |
2cbb1c4b | 25642 | + oflags /* | __FMODE_NONOTIFY */, |
7f207e10 | 25643 | + mode); |
2cbb1c4b | 25644 | + lockdep_on(); |
1facf9fc | 25645 | + if (IS_ERR(file)) |
25646 | + goto out; | |
25647 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
25648 | + | |
4f0767ce | 25649 | +out: |
1facf9fc | 25650 | + return file; |
25651 | +} | |
25652 | + | |
25653 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path) | |
25654 | +{ | |
25655 | + int err; | |
25656 | + | |
1facf9fc | 25657 | + err = kern_path(name, flags, path); |
1facf9fc | 25658 | + if (!err && path->dentry->d_inode) |
25659 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ | |
25660 | + return err; | |
25661 | +} | |
25662 | + | |
25663 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, | |
25664 | + int len) | |
25665 | +{ | |
25666 | + struct path path = { | |
25667 | + .mnt = NULL | |
25668 | + }; | |
25669 | + | |
1308ab2a | 25670 | + /* VFS checks it too, but by WARN_ON_ONCE() */ |
1facf9fc | 25671 | + IMustLock(parent->d_inode); |
25672 | + | |
25673 | + path.dentry = lookup_one_len(name, parent, len); | |
25674 | + if (IS_ERR(path.dentry)) | |
25675 | + goto out; | |
25676 | + if (path.dentry->d_inode) | |
25677 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ | |
25678 | + | |
4f0767ce | 25679 | +out: |
4a4d8108 | 25680 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 25681 | + return path.dentry; |
25682 | +} | |
25683 | + | |
25684 | +struct dentry *vfsub_lookup_hash(struct nameidata *nd) | |
25685 | +{ | |
25686 | + struct path path = { | |
25687 | + .mnt = nd->path.mnt | |
25688 | + }; | |
25689 | + | |
25690 | + IMustLock(nd->path.dentry->d_inode); | |
25691 | + | |
25692 | + path.dentry = lookup_hash(nd); | |
4a4d8108 AM |
25693 | + if (IS_ERR(path.dentry)) |
25694 | + goto out; | |
25695 | + if (path.dentry->d_inode) | |
1facf9fc | 25696 | + vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/ |
25697 | + | |
4f0767ce | 25698 | +out: |
4a4d8108 | 25699 | + AuTraceErrPtr(path.dentry); |
1facf9fc | 25700 | + return path.dentry; |
25701 | +} | |
25702 | + | |
2cbb1c4b JR |
25703 | +/* |
25704 | + * this is "VFS:__lookup_one_len()" which was removed and merged into | |
25705 | + * VFS:lookup_one_len() by the commit. | |
25706 | + * 6a96ba5 2011-03-14 kill __lookup_one_len() | |
25707 | + * this function should always be equivalent to the corresponding part in | |
25708 | + * VFS:lookup_one_len(). | |
25709 | + */ | |
25710 | +int vfsub_name_hash(const char *name, struct qstr *this, int len) | |
25711 | +{ | |
25712 | + unsigned long hash; | |
25713 | + unsigned int c; | |
25714 | + | |
25715 | + this->name = name; | |
25716 | + this->len = len; | |
25717 | + if (!len) | |
25718 | + return -EACCES; | |
25719 | + | |
25720 | + hash = init_name_hash(); | |
25721 | + while (len--) { | |
25722 | + c = *(const unsigned char *)name++; | |
25723 | + if (c == '/' || c == '\0') | |
25724 | + return -EACCES; | |
25725 | + hash = partial_name_hash(c, hash); | |
25726 | + } | |
25727 | + this->hash = end_name_hash(hash); | |
25728 | + return 0; | |
25729 | +} | |
25730 | + | |
1facf9fc | 25731 | +/* ---------------------------------------------------------------------- */ |
25732 | + | |
25733 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
25734 | + struct dentry *d2, struct au_hinode *hdir2) | |
25735 | +{ | |
25736 | + struct dentry *d; | |
25737 | + | |
2cbb1c4b | 25738 | + lockdep_off(); |
1facf9fc | 25739 | + d = lock_rename(d1, d2); |
2cbb1c4b | 25740 | + lockdep_on(); |
4a4d8108 | 25741 | + au_hn_suspend(hdir1); |
1facf9fc | 25742 | + if (hdir1 != hdir2) |
4a4d8108 | 25743 | + au_hn_suspend(hdir2); |
1facf9fc | 25744 | + |
25745 | + return d; | |
25746 | +} | |
25747 | + | |
25748 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
25749 | + struct dentry *d2, struct au_hinode *hdir2) | |
25750 | +{ | |
4a4d8108 | 25751 | + au_hn_resume(hdir1); |
1facf9fc | 25752 | + if (hdir1 != hdir2) |
4a4d8108 | 25753 | + au_hn_resume(hdir2); |
2cbb1c4b | 25754 | + lockdep_off(); |
1facf9fc | 25755 | + unlock_rename(d1, d2); |
2cbb1c4b | 25756 | + lockdep_on(); |
1facf9fc | 25757 | +} |
25758 | + | |
25759 | +/* ---------------------------------------------------------------------- */ | |
25760 | + | |
25761 | +int vfsub_create(struct inode *dir, struct path *path, int mode) | |
25762 | +{ | |
25763 | + int err; | |
25764 | + struct dentry *d; | |
25765 | + | |
25766 | + IMustLock(dir); | |
25767 | + | |
25768 | + d = path->dentry; | |
25769 | + path->dentry = d->d_parent; | |
b752ccd1 | 25770 | + err = security_path_mknod(path, d, mode, 0); |
1facf9fc | 25771 | + path->dentry = d; |
25772 | + if (unlikely(err)) | |
25773 | + goto out; | |
25774 | + | |
25775 | + if (au_test_fs_null_nd(dir->i_sb)) | |
25776 | + err = vfs_create(dir, path->dentry, mode, NULL); | |
25777 | + else { | |
25778 | + struct nameidata h_nd; | |
25779 | + | |
25780 | + memset(&h_nd, 0, sizeof(h_nd)); | |
25781 | + h_nd.flags = LOOKUP_CREATE; | |
25782 | + h_nd.intent.open.flags = O_CREAT | |
25783 | + | vfsub_fmode_to_uint(FMODE_READ); | |
25784 | + h_nd.intent.open.create_mode = mode; | |
25785 | + h_nd.path.dentry = path->dentry->d_parent; | |
25786 | + h_nd.path.mnt = path->mnt; | |
25787 | + path_get(&h_nd.path); | |
25788 | + err = vfs_create(dir, path->dentry, mode, &h_nd); | |
25789 | + path_put(&h_nd.path); | |
25790 | + } | |
25791 | + | |
25792 | + if (!err) { | |
25793 | + struct path tmp = *path; | |
25794 | + int did; | |
25795 | + | |
25796 | + vfsub_update_h_iattr(&tmp, &did); | |
25797 | + if (did) { | |
25798 | + tmp.dentry = path->dentry->d_parent; | |
25799 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25800 | + } | |
25801 | + /*ignore*/ | |
25802 | + } | |
25803 | + | |
4f0767ce | 25804 | +out: |
1facf9fc | 25805 | + return err; |
25806 | +} | |
25807 | + | |
25808 | +int vfsub_symlink(struct inode *dir, struct path *path, const char *symname) | |
25809 | +{ | |
25810 | + int err; | |
25811 | + struct dentry *d; | |
25812 | + | |
25813 | + IMustLock(dir); | |
25814 | + | |
25815 | + d = path->dentry; | |
25816 | + path->dentry = d->d_parent; | |
b752ccd1 | 25817 | + err = security_path_symlink(path, d, symname); |
1facf9fc | 25818 | + path->dentry = d; |
25819 | + if (unlikely(err)) | |
25820 | + goto out; | |
25821 | + | |
25822 | + err = vfs_symlink(dir, path->dentry, symname); | |
25823 | + if (!err) { | |
25824 | + struct path tmp = *path; | |
25825 | + int did; | |
25826 | + | |
25827 | + vfsub_update_h_iattr(&tmp, &did); | |
25828 | + if (did) { | |
25829 | + tmp.dentry = path->dentry->d_parent; | |
25830 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25831 | + } | |
25832 | + /*ignore*/ | |
25833 | + } | |
25834 | + | |
4f0767ce | 25835 | +out: |
1facf9fc | 25836 | + return err; |
25837 | +} | |
25838 | + | |
25839 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev) | |
25840 | +{ | |
25841 | + int err; | |
25842 | + struct dentry *d; | |
25843 | + | |
25844 | + IMustLock(dir); | |
25845 | + | |
25846 | + d = path->dentry; | |
25847 | + path->dentry = d->d_parent; | |
027c5e7a | 25848 | + err = security_path_mknod(path, d, mode, new_encode_dev(dev)); |
1facf9fc | 25849 | + path->dentry = d; |
25850 | + if (unlikely(err)) | |
25851 | + goto out; | |
25852 | + | |
25853 | + err = vfs_mknod(dir, path->dentry, mode, dev); | |
25854 | + if (!err) { | |
25855 | + struct path tmp = *path; | |
25856 | + int did; | |
25857 | + | |
25858 | + vfsub_update_h_iattr(&tmp, &did); | |
25859 | + if (did) { | |
25860 | + tmp.dentry = path->dentry->d_parent; | |
25861 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25862 | + } | |
25863 | + /*ignore*/ | |
25864 | + } | |
25865 | + | |
4f0767ce | 25866 | +out: |
1facf9fc | 25867 | + return err; |
25868 | +} | |
25869 | + | |
25870 | +static int au_test_nlink(struct inode *inode) | |
25871 | +{ | |
25872 | + const unsigned int link_max = UINT_MAX >> 1; /* rough margin */ | |
25873 | + | |
25874 | + if (!au_test_fs_no_limit_nlink(inode->i_sb) | |
25875 | + || inode->i_nlink < link_max) | |
25876 | + return 0; | |
25877 | + return -EMLINK; | |
25878 | +} | |
25879 | + | |
25880 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path) | |
25881 | +{ | |
25882 | + int err; | |
25883 | + struct dentry *d; | |
25884 | + | |
25885 | + IMustLock(dir); | |
25886 | + | |
25887 | + err = au_test_nlink(src_dentry->d_inode); | |
25888 | + if (unlikely(err)) | |
25889 | + return err; | |
25890 | + | |
25891 | + d = path->dentry; | |
25892 | + path->dentry = d->d_parent; | |
b752ccd1 | 25893 | + err = security_path_link(src_dentry, path, d); |
1facf9fc | 25894 | + path->dentry = d; |
25895 | + if (unlikely(err)) | |
25896 | + goto out; | |
25897 | + | |
2cbb1c4b | 25898 | + lockdep_off(); |
1facf9fc | 25899 | + err = vfs_link(src_dentry, dir, path->dentry); |
2cbb1c4b | 25900 | + lockdep_on(); |
1facf9fc | 25901 | + if (!err) { |
25902 | + struct path tmp = *path; | |
25903 | + int did; | |
25904 | + | |
25905 | + /* fuse has different memory inode for the same inumber */ | |
25906 | + vfsub_update_h_iattr(&tmp, &did); | |
25907 | + if (did) { | |
25908 | + tmp.dentry = path->dentry->d_parent; | |
25909 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25910 | + tmp.dentry = src_dentry; | |
25911 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25912 | + } | |
25913 | + /*ignore*/ | |
25914 | + } | |
25915 | + | |
4f0767ce | 25916 | +out: |
1facf9fc | 25917 | + return err; |
25918 | +} | |
25919 | + | |
25920 | +int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry, | |
25921 | + struct inode *dir, struct path *path) | |
25922 | +{ | |
25923 | + int err; | |
25924 | + struct path tmp = { | |
25925 | + .mnt = path->mnt | |
25926 | + }; | |
25927 | + struct dentry *d; | |
25928 | + | |
25929 | + IMustLock(dir); | |
25930 | + IMustLock(src_dir); | |
25931 | + | |
25932 | + d = path->dentry; | |
25933 | + path->dentry = d->d_parent; | |
25934 | + tmp.dentry = src_dentry->d_parent; | |
b752ccd1 | 25935 | + err = security_path_rename(&tmp, src_dentry, path, d); |
1facf9fc | 25936 | + path->dentry = d; |
25937 | + if (unlikely(err)) | |
25938 | + goto out; | |
25939 | + | |
2cbb1c4b | 25940 | + lockdep_off(); |
1facf9fc | 25941 | + err = vfs_rename(src_dir, src_dentry, dir, path->dentry); |
2cbb1c4b | 25942 | + lockdep_on(); |
1facf9fc | 25943 | + if (!err) { |
25944 | + int did; | |
25945 | + | |
25946 | + tmp.dentry = d->d_parent; | |
25947 | + vfsub_update_h_iattr(&tmp, &did); | |
25948 | + if (did) { | |
25949 | + tmp.dentry = src_dentry; | |
25950 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25951 | + tmp.dentry = src_dentry->d_parent; | |
25952 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25953 | + } | |
25954 | + /*ignore*/ | |
25955 | + } | |
25956 | + | |
4f0767ce | 25957 | +out: |
1facf9fc | 25958 | + return err; |
25959 | +} | |
25960 | + | |
25961 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode) | |
25962 | +{ | |
25963 | + int err; | |
25964 | + struct dentry *d; | |
25965 | + | |
25966 | + IMustLock(dir); | |
25967 | + | |
25968 | + d = path->dentry; | |
25969 | + path->dentry = d->d_parent; | |
b752ccd1 | 25970 | + err = security_path_mkdir(path, d, mode); |
1facf9fc | 25971 | + path->dentry = d; |
25972 | + if (unlikely(err)) | |
25973 | + goto out; | |
25974 | + | |
25975 | + err = vfs_mkdir(dir, path->dentry, mode); | |
25976 | + if (!err) { | |
25977 | + struct path tmp = *path; | |
25978 | + int did; | |
25979 | + | |
25980 | + vfsub_update_h_iattr(&tmp, &did); | |
25981 | + if (did) { | |
25982 | + tmp.dentry = path->dentry->d_parent; | |
25983 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); | |
25984 | + } | |
25985 | + /*ignore*/ | |
25986 | + } | |
25987 | + | |
4f0767ce | 25988 | +out: |
1facf9fc | 25989 | + return err; |
25990 | +} | |
25991 | + | |
25992 | +int vfsub_rmdir(struct inode *dir, struct path *path) | |
25993 | +{ | |
25994 | + int err; | |
25995 | + struct dentry *d; | |
25996 | + | |
25997 | + IMustLock(dir); | |
25998 | + | |
25999 | + d = path->dentry; | |
26000 | + path->dentry = d->d_parent; | |
b752ccd1 | 26001 | + err = security_path_rmdir(path, d); |
1facf9fc | 26002 | + path->dentry = d; |
26003 | + if (unlikely(err)) | |
26004 | + goto out; | |
26005 | + | |
2cbb1c4b | 26006 | + lockdep_off(); |
1facf9fc | 26007 | + err = vfs_rmdir(dir, path->dentry); |
2cbb1c4b | 26008 | + lockdep_on(); |
1facf9fc | 26009 | + if (!err) { |
26010 | + struct path tmp = { | |
26011 | + .dentry = path->dentry->d_parent, | |
26012 | + .mnt = path->mnt | |
26013 | + }; | |
26014 | + | |
26015 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
26016 | + } | |
26017 | + | |
4f0767ce | 26018 | +out: |
1facf9fc | 26019 | + return err; |
26020 | +} | |
26021 | + | |
26022 | +/* ---------------------------------------------------------------------- */ | |
26023 | + | |
26024 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
26025 | + loff_t *ppos) | |
26026 | +{ | |
26027 | + ssize_t err; | |
26028 | + | |
2cbb1c4b | 26029 | + lockdep_off(); |
1facf9fc | 26030 | + err = vfs_read(file, ubuf, count, ppos); |
2cbb1c4b | 26031 | + lockdep_on(); |
1facf9fc | 26032 | + if (err >= 0) |
26033 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
26034 | + return err; | |
26035 | +} | |
26036 | + | |
26037 | +/* todo: kernel_read()? */ | |
26038 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
26039 | + loff_t *ppos) | |
26040 | +{ | |
26041 | + ssize_t err; | |
26042 | + mm_segment_t oldfs; | |
b752ccd1 AM |
26043 | + union { |
26044 | + void *k; | |
26045 | + char __user *u; | |
26046 | + } buf; | |
1facf9fc | 26047 | + |
b752ccd1 | 26048 | + buf.k = kbuf; |
1facf9fc | 26049 | + oldfs = get_fs(); |
26050 | + set_fs(KERNEL_DS); | |
b752ccd1 | 26051 | + err = vfsub_read_u(file, buf.u, count, ppos); |
1facf9fc | 26052 | + set_fs(oldfs); |
26053 | + return err; | |
26054 | +} | |
26055 | + | |
26056 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
26057 | + loff_t *ppos) | |
26058 | +{ | |
26059 | + ssize_t err; | |
26060 | + | |
2cbb1c4b | 26061 | + lockdep_off(); |
1facf9fc | 26062 | + err = vfs_write(file, ubuf, count, ppos); |
2cbb1c4b | 26063 | + lockdep_on(); |
1facf9fc | 26064 | + if (err >= 0) |
26065 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
26066 | + return err; | |
26067 | +} | |
26068 | + | |
26069 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos) | |
26070 | +{ | |
26071 | + ssize_t err; | |
26072 | + mm_segment_t oldfs; | |
b752ccd1 AM |
26073 | + union { |
26074 | + void *k; | |
26075 | + const char __user *u; | |
26076 | + } buf; | |
1facf9fc | 26077 | + |
b752ccd1 | 26078 | + buf.k = kbuf; |
1facf9fc | 26079 | + oldfs = get_fs(); |
26080 | + set_fs(KERNEL_DS); | |
b752ccd1 | 26081 | + err = vfsub_write_u(file, buf.u, count, ppos); |
1facf9fc | 26082 | + set_fs(oldfs); |
26083 | + return err; | |
26084 | +} | |
26085 | + | |
4a4d8108 AM |
26086 | +int vfsub_flush(struct file *file, fl_owner_t id) |
26087 | +{ | |
26088 | + int err; | |
26089 | + | |
26090 | + err = 0; | |
26091 | + if (file->f_op && file->f_op->flush) { | |
2cbb1c4b JR |
26092 | + if (!au_test_nfs(file->f_dentry->d_sb)) |
26093 | + err = file->f_op->flush(file, id); | |
26094 | + else { | |
26095 | + lockdep_off(); | |
26096 | + err = file->f_op->flush(file, id); | |
26097 | + lockdep_on(); | |
26098 | + } | |
4a4d8108 AM |
26099 | + if (!err) |
26100 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); | |
26101 | + /*ignore*/ | |
26102 | + } | |
26103 | + return err; | |
26104 | +} | |
26105 | + | |
1facf9fc | 26106 | +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg) |
26107 | +{ | |
26108 | + int err; | |
26109 | + | |
2cbb1c4b | 26110 | + lockdep_off(); |
1facf9fc | 26111 | + err = vfs_readdir(file, filldir, arg); |
2cbb1c4b | 26112 | + lockdep_on(); |
1facf9fc | 26113 | + if (err >= 0) |
26114 | + vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/ | |
26115 | + return err; | |
26116 | +} | |
26117 | + | |
26118 | +long vfsub_splice_to(struct file *in, loff_t *ppos, | |
26119 | + struct pipe_inode_info *pipe, size_t len, | |
26120 | + unsigned int flags) | |
26121 | +{ | |
26122 | + long err; | |
26123 | + | |
2cbb1c4b | 26124 | + lockdep_off(); |
0fc653ad | 26125 | + err = do_splice_to(in, ppos, pipe, len, flags); |
2cbb1c4b | 26126 | + lockdep_on(); |
4a4d8108 | 26127 | + file_accessed(in); |
1facf9fc | 26128 | + if (err >= 0) |
26129 | + vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/ | |
26130 | + return err; | |
26131 | +} | |
26132 | + | |
26133 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
26134 | + loff_t *ppos, size_t len, unsigned int flags) | |
26135 | +{ | |
26136 | + long err; | |
26137 | + | |
2cbb1c4b | 26138 | + lockdep_off(); |
0fc653ad | 26139 | + err = do_splice_from(pipe, out, ppos, len, flags); |
2cbb1c4b | 26140 | + lockdep_on(); |
1facf9fc | 26141 | + if (err >= 0) |
26142 | + vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/ | |
26143 | + return err; | |
26144 | +} | |
26145 | + | |
53392da6 AM |
26146 | +int vfsub_fsync(struct file *file, struct path *path, int datasync) |
26147 | +{ | |
26148 | + int err; | |
26149 | + | |
26150 | + /* file can be NULL */ | |
26151 | + lockdep_off(); | |
26152 | + err = vfs_fsync(file, datasync); | |
26153 | + lockdep_on(); | |
26154 | + if (!err) { | |
26155 | + if (!path) { | |
26156 | + AuDebugOn(!file); | |
26157 | + path = &file->f_path; | |
26158 | + } | |
26159 | + vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/ | |
26160 | + } | |
26161 | + return err; | |
26162 | +} | |
26163 | + | |
1facf9fc | 26164 | +/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */ |
26165 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
26166 | + struct file *h_file) | |
26167 | +{ | |
26168 | + int err; | |
26169 | + struct inode *h_inode; | |
26170 | + | |
26171 | + h_inode = h_path->dentry->d_inode; | |
26172 | + if (!h_file) { | |
26173 | + err = mnt_want_write(h_path->mnt); | |
26174 | + if (err) | |
26175 | + goto out; | |
26176 | + err = inode_permission(h_inode, MAY_WRITE); | |
26177 | + if (err) | |
26178 | + goto out_mnt; | |
26179 | + err = get_write_access(h_inode); | |
26180 | + if (err) | |
26181 | + goto out_mnt; | |
4a4d8108 | 26182 | + err = break_lease(h_inode, O_WRONLY); |
1facf9fc | 26183 | + if (err) |
26184 | + goto out_inode; | |
26185 | + } | |
26186 | + | |
26187 | + err = locks_verify_truncate(h_inode, h_file, length); | |
26188 | + if (!err) | |
953406b4 | 26189 | + err = security_path_truncate(h_path); |
2cbb1c4b JR |
26190 | + if (!err) { |
26191 | + lockdep_off(); | |
1facf9fc | 26192 | + err = do_truncate(h_path->dentry, length, attr, h_file); |
2cbb1c4b JR |
26193 | + lockdep_on(); |
26194 | + } | |
1facf9fc | 26195 | + |
4f0767ce | 26196 | +out_inode: |
1facf9fc | 26197 | + if (!h_file) |
26198 | + put_write_access(h_inode); | |
4f0767ce | 26199 | +out_mnt: |
1facf9fc | 26200 | + if (!h_file) |
26201 | + mnt_drop_write(h_path->mnt); | |
4f0767ce | 26202 | +out: |
1facf9fc | 26203 | + return err; |
26204 | +} | |
26205 | + | |
26206 | +/* ---------------------------------------------------------------------- */ | |
26207 | + | |
26208 | +struct au_vfsub_mkdir_args { | |
26209 | + int *errp; | |
26210 | + struct inode *dir; | |
26211 | + struct path *path; | |
26212 | + int mode; | |
26213 | +}; | |
26214 | + | |
26215 | +static void au_call_vfsub_mkdir(void *args) | |
26216 | +{ | |
26217 | + struct au_vfsub_mkdir_args *a = args; | |
26218 | + *a->errp = vfsub_mkdir(a->dir, a->path, a->mode); | |
26219 | +} | |
26220 | + | |
26221 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode) | |
26222 | +{ | |
26223 | + int err, do_sio, wkq_err; | |
26224 | + | |
26225 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
26226 | + if (!do_sio) | |
26227 | + err = vfsub_mkdir(dir, path, mode); | |
26228 | + else { | |
26229 | + struct au_vfsub_mkdir_args args = { | |
26230 | + .errp = &err, | |
26231 | + .dir = dir, | |
26232 | + .path = path, | |
26233 | + .mode = mode | |
26234 | + }; | |
26235 | + wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args); | |
26236 | + if (unlikely(wkq_err)) | |
26237 | + err = wkq_err; | |
26238 | + } | |
26239 | + | |
26240 | + return err; | |
26241 | +} | |
26242 | + | |
26243 | +struct au_vfsub_rmdir_args { | |
26244 | + int *errp; | |
26245 | + struct inode *dir; | |
26246 | + struct path *path; | |
26247 | +}; | |
26248 | + | |
26249 | +static void au_call_vfsub_rmdir(void *args) | |
26250 | +{ | |
26251 | + struct au_vfsub_rmdir_args *a = args; | |
26252 | + *a->errp = vfsub_rmdir(a->dir, a->path); | |
26253 | +} | |
26254 | + | |
26255 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path) | |
26256 | +{ | |
26257 | + int err, do_sio, wkq_err; | |
26258 | + | |
26259 | + do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE); | |
26260 | + if (!do_sio) | |
26261 | + err = vfsub_rmdir(dir, path); | |
26262 | + else { | |
26263 | + struct au_vfsub_rmdir_args args = { | |
26264 | + .errp = &err, | |
26265 | + .dir = dir, | |
26266 | + .path = path | |
26267 | + }; | |
26268 | + wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args); | |
26269 | + if (unlikely(wkq_err)) | |
26270 | + err = wkq_err; | |
26271 | + } | |
26272 | + | |
26273 | + return err; | |
26274 | +} | |
26275 | + | |
26276 | +/* ---------------------------------------------------------------------- */ | |
26277 | + | |
26278 | +struct notify_change_args { | |
26279 | + int *errp; | |
26280 | + struct path *path; | |
26281 | + struct iattr *ia; | |
26282 | +}; | |
26283 | + | |
26284 | +static void call_notify_change(void *args) | |
26285 | +{ | |
26286 | + struct notify_change_args *a = args; | |
26287 | + struct inode *h_inode; | |
26288 | + | |
26289 | + h_inode = a->path->dentry->d_inode; | |
26290 | + IMustLock(h_inode); | |
26291 | + | |
26292 | + *a->errp = -EPERM; | |
26293 | + if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) { | |
1facf9fc | 26294 | + *a->errp = notify_change(a->path->dentry, a->ia); |
1facf9fc | 26295 | + if (!*a->errp) |
26296 | + vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/ | |
26297 | + } | |
26298 | + AuTraceErr(*a->errp); | |
26299 | +} | |
26300 | + | |
26301 | +int vfsub_notify_change(struct path *path, struct iattr *ia) | |
26302 | +{ | |
26303 | + int err; | |
26304 | + struct notify_change_args args = { | |
26305 | + .errp = &err, | |
26306 | + .path = path, | |
26307 | + .ia = ia | |
26308 | + }; | |
26309 | + | |
26310 | + call_notify_change(&args); | |
26311 | + | |
26312 | + return err; | |
26313 | +} | |
26314 | + | |
26315 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia) | |
26316 | +{ | |
26317 | + int err, wkq_err; | |
26318 | + struct notify_change_args args = { | |
26319 | + .errp = &err, | |
26320 | + .path = path, | |
26321 | + .ia = ia | |
26322 | + }; | |
26323 | + | |
26324 | + wkq_err = au_wkq_wait(call_notify_change, &args); | |
26325 | + if (unlikely(wkq_err)) | |
26326 | + err = wkq_err; | |
26327 | + | |
26328 | + return err; | |
26329 | +} | |
26330 | + | |
26331 | +/* ---------------------------------------------------------------------- */ | |
26332 | + | |
26333 | +struct unlink_args { | |
26334 | + int *errp; | |
26335 | + struct inode *dir; | |
26336 | + struct path *path; | |
26337 | +}; | |
26338 | + | |
26339 | +static void call_unlink(void *args) | |
26340 | +{ | |
26341 | + struct unlink_args *a = args; | |
26342 | + struct dentry *d = a->path->dentry; | |
26343 | + struct inode *h_inode; | |
26344 | + const int stop_sillyrename = (au_test_nfs(d->d_sb) | |
027c5e7a | 26345 | + && d->d_count == 1); |
1facf9fc | 26346 | + |
26347 | + IMustLock(a->dir); | |
26348 | + | |
26349 | + a->path->dentry = d->d_parent; | |
26350 | + *a->errp = security_path_unlink(a->path, d); | |
26351 | + a->path->dentry = d; | |
26352 | + if (unlikely(*a->errp)) | |
26353 | + return; | |
26354 | + | |
26355 | + if (!stop_sillyrename) | |
26356 | + dget(d); | |
26357 | + h_inode = d->d_inode; | |
26358 | + if (h_inode) | |
027c5e7a | 26359 | + ihold(h_inode); |
1facf9fc | 26360 | + |
2cbb1c4b | 26361 | + lockdep_off(); |
1facf9fc | 26362 | + *a->errp = vfs_unlink(a->dir, d); |
2cbb1c4b | 26363 | + lockdep_on(); |
1facf9fc | 26364 | + if (!*a->errp) { |
26365 | + struct path tmp = { | |
26366 | + .dentry = d->d_parent, | |
26367 | + .mnt = a->path->mnt | |
26368 | + }; | |
26369 | + vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/ | |
26370 | + } | |
26371 | + | |
26372 | + if (!stop_sillyrename) | |
26373 | + dput(d); | |
26374 | + if (h_inode) | |
26375 | + iput(h_inode); | |
26376 | + | |
26377 | + AuTraceErr(*a->errp); | |
26378 | +} | |
26379 | + | |
26380 | +/* | |
26381 | + * @dir: must be locked. | |
26382 | + * @dentry: target dentry. | |
26383 | + */ | |
26384 | +int vfsub_unlink(struct inode *dir, struct path *path, int force) | |
26385 | +{ | |
26386 | + int err; | |
26387 | + struct unlink_args args = { | |
26388 | + .errp = &err, | |
26389 | + .dir = dir, | |
26390 | + .path = path | |
26391 | + }; | |
26392 | + | |
26393 | + if (!force) | |
26394 | + call_unlink(&args); | |
26395 | + else { | |
26396 | + int wkq_err; | |
26397 | + | |
26398 | + wkq_err = au_wkq_wait(call_unlink, &args); | |
26399 | + if (unlikely(wkq_err)) | |
26400 | + err = wkq_err; | |
26401 | + } | |
26402 | + | |
26403 | + return err; | |
26404 | +} | |
7f207e10 AM |
26405 | diff -urN /usr/share/empty/fs/aufs/vfsub.h linux/fs/aufs/vfsub.h |
26406 | --- /usr/share/empty/fs/aufs/vfsub.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
26407 | +++ linux/fs/aufs/vfsub.h 2011-08-24 13:30:24.734646739 +0200 |
26408 | @@ -0,0 +1,232 @@ | |
1facf9fc | 26409 | +/* |
027c5e7a | 26410 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 26411 | + * |
26412 | + * This program, aufs is free software; you can redistribute it and/or modify | |
26413 | + * it under the terms of the GNU General Public License as published by | |
26414 | + * the Free Software Foundation; either version 2 of the License, or | |
26415 | + * (at your option) any later version. | |
dece6358 AM |
26416 | + * |
26417 | + * This program is distributed in the hope that it will be useful, | |
26418 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26419 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26420 | + * GNU General Public License for more details. | |
26421 | + * | |
26422 | + * You should have received a copy of the GNU General Public License | |
26423 | + * along with this program; if not, write to the Free Software | |
26424 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 26425 | + */ |
26426 | + | |
26427 | +/* | |
26428 | + * sub-routines for VFS | |
26429 | + */ | |
26430 | + | |
26431 | +#ifndef __AUFS_VFSUB_H__ | |
26432 | +#define __AUFS_VFSUB_H__ | |
26433 | + | |
26434 | +#ifdef __KERNEL__ | |
26435 | + | |
26436 | +#include <linux/fs.h> | |
0c5527e5 | 26437 | +#include <linux/lglock.h> |
7f207e10 | 26438 | +#include "debug.h" |
1facf9fc | 26439 | + |
7f207e10 | 26440 | +/* copied from linux/fs/internal.h */ |
2cbb1c4b | 26441 | +/* todo: BAD approach!! */ |
0c5527e5 | 26442 | +DECLARE_BRLOCK(vfsmount_lock); |
0c5527e5 | 26443 | +extern void file_sb_list_del(struct file *f); |
2cbb1c4b | 26444 | +extern spinlock_t inode_sb_list_lock; |
0c5527e5 | 26445 | + |
7f207e10 AM |
26446 | +/* copied from linux/fs/file_table.c */ |
26447 | +DECLARE_LGLOCK(files_lglock); | |
0c5527e5 AM |
26448 | +#ifdef CONFIG_SMP |
26449 | +/* | |
26450 | + * These macros iterate all files on all CPUs for a given superblock. | |
26451 | + * files_lglock must be held globally. | |
26452 | + */ | |
26453 | +#define do_file_list_for_each_entry(__sb, __file) \ | |
26454 | +{ \ | |
26455 | + int i; \ | |
26456 | + for_each_possible_cpu(i) { \ | |
26457 | + struct list_head *list; \ | |
26458 | + list = per_cpu_ptr((__sb)->s_files, i); \ | |
26459 | + list_for_each_entry((__file), list, f_u.fu_list) | |
26460 | + | |
26461 | +#define while_file_list_for_each_entry \ | |
26462 | + } \ | |
26463 | +} | |
26464 | + | |
26465 | +#else | |
26466 | + | |
26467 | +#define do_file_list_for_each_entry(__sb, __file) \ | |
26468 | +{ \ | |
26469 | + struct list_head *list; \ | |
26470 | + list = &(sb)->s_files; \ | |
26471 | + list_for_each_entry((__file), list, f_u.fu_list) | |
26472 | + | |
26473 | +#define while_file_list_for_each_entry \ | |
26474 | +} | |
7f207e10 AM |
26475 | +#endif |
26476 | + | |
26477 | +/* ---------------------------------------------------------------------- */ | |
1facf9fc | 26478 | + |
26479 | +/* lock subclass for lower inode */ | |
26480 | +/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */ | |
26481 | +/* reduce? gave up. */ | |
26482 | +enum { | |
26483 | + AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */ | |
26484 | + AuLsc_I_PARENT, /* lower inode, parent first */ | |
26485 | + AuLsc_I_PARENT2, /* copyup dirs */ | |
dece6358 | 26486 | + AuLsc_I_PARENT3, /* copyup wh */ |
1facf9fc | 26487 | + AuLsc_I_CHILD, |
26488 | + AuLsc_I_CHILD2, | |
26489 | + AuLsc_I_End | |
26490 | +}; | |
26491 | + | |
26492 | +/* to debug easier, do not make them inlined functions */ | |
26493 | +#define MtxMustLock(mtx) AuDebugOn(!mutex_is_locked(mtx)) | |
26494 | +#define IMustLock(i) MtxMustLock(&(i)->i_mutex) | |
26495 | + | |
26496 | +/* ---------------------------------------------------------------------- */ | |
26497 | + | |
7f207e10 AM |
26498 | +static inline void vfsub_drop_nlink(struct inode *inode) |
26499 | +{ | |
26500 | + AuDebugOn(!inode->i_nlink); | |
26501 | + drop_nlink(inode); | |
26502 | +} | |
26503 | + | |
027c5e7a AM |
26504 | +static inline void vfsub_dead_dir(struct inode *inode) |
26505 | +{ | |
26506 | + AuDebugOn(!S_ISDIR(inode->i_mode)); | |
26507 | + inode->i_flags |= S_DEAD; | |
26508 | + clear_nlink(inode); | |
26509 | +} | |
26510 | + | |
7f207e10 AM |
26511 | +/* ---------------------------------------------------------------------- */ |
26512 | + | |
26513 | +int vfsub_update_h_iattr(struct path *h_path, int *did); | |
26514 | +struct file *vfsub_dentry_open(struct path *path, int flags); | |
26515 | +struct file *vfsub_filp_open(const char *path, int oflags, int mode); | |
1facf9fc | 26516 | +int vfsub_kern_path(const char *name, unsigned int flags, struct path *path); |
26517 | +struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent, | |
26518 | + int len); | |
26519 | +struct dentry *vfsub_lookup_hash(struct nameidata *nd); | |
2cbb1c4b | 26520 | +int vfsub_name_hash(const char *name, struct qstr *this, int len); |
1facf9fc | 26521 | + |
26522 | +/* ---------------------------------------------------------------------- */ | |
26523 | + | |
26524 | +struct au_hinode; | |
26525 | +struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
26526 | + struct dentry *d2, struct au_hinode *hdir2); | |
26527 | +void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1, | |
26528 | + struct dentry *d2, struct au_hinode *hdir2); | |
26529 | + | |
26530 | +int vfsub_create(struct inode *dir, struct path *path, int mode); | |
26531 | +int vfsub_symlink(struct inode *dir, struct path *path, | |
26532 | + const char *symname); | |
26533 | +int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev); | |
26534 | +int vfsub_link(struct dentry *src_dentry, struct inode *dir, | |
26535 | + struct path *path); | |
26536 | +int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry, | |
26537 | + struct inode *hdir, struct path *path); | |
26538 | +int vfsub_mkdir(struct inode *dir, struct path *path, int mode); | |
26539 | +int vfsub_rmdir(struct inode *dir, struct path *path); | |
26540 | + | |
26541 | +/* ---------------------------------------------------------------------- */ | |
26542 | + | |
26543 | +ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count, | |
26544 | + loff_t *ppos); | |
26545 | +ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count, | |
26546 | + loff_t *ppos); | |
26547 | +ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count, | |
26548 | + loff_t *ppos); | |
26549 | +ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, | |
26550 | + loff_t *ppos); | |
4a4d8108 | 26551 | +int vfsub_flush(struct file *file, fl_owner_t id); |
1facf9fc | 26552 | +int vfsub_readdir(struct file *file, filldir_t filldir, void *arg); |
26553 | + | |
4a4d8108 AM |
26554 | +static inline unsigned int vfsub_file_flags(struct file *file) |
26555 | +{ | |
26556 | + unsigned int flags; | |
26557 | + | |
26558 | + spin_lock(&file->f_lock); | |
26559 | + flags = file->f_flags; | |
26560 | + spin_unlock(&file->f_lock); | |
26561 | + | |
26562 | + return flags; | |
26563 | +} | |
1308ab2a | 26564 | + |
1facf9fc | 26565 | +static inline void vfsub_file_accessed(struct file *h_file) |
26566 | +{ | |
26567 | + file_accessed(h_file); | |
26568 | + vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/ | |
26569 | +} | |
26570 | + | |
26571 | +static inline void vfsub_touch_atime(struct vfsmount *h_mnt, | |
26572 | + struct dentry *h_dentry) | |
26573 | +{ | |
26574 | + struct path h_path = { | |
26575 | + .dentry = h_dentry, | |
26576 | + .mnt = h_mnt | |
26577 | + }; | |
26578 | + touch_atime(h_mnt, h_dentry); | |
26579 | + vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/ | |
26580 | +} | |
26581 | + | |
4a4d8108 AM |
26582 | +long vfsub_splice_to(struct file *in, loff_t *ppos, |
26583 | + struct pipe_inode_info *pipe, size_t len, | |
26584 | + unsigned int flags); | |
26585 | +long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out, | |
26586 | + loff_t *ppos, size_t len, unsigned int flags); | |
26587 | +int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr, | |
26588 | + struct file *h_file); | |
53392da6 | 26589 | +int vfsub_fsync(struct file *file, struct path *path, int datasync); |
4a4d8108 | 26590 | + |
1facf9fc | 26591 | +/* ---------------------------------------------------------------------- */ |
26592 | + | |
26593 | +static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin) | |
26594 | +{ | |
26595 | + loff_t err; | |
26596 | + | |
2cbb1c4b | 26597 | + lockdep_off(); |
1facf9fc | 26598 | + err = vfs_llseek(file, offset, origin); |
2cbb1c4b | 26599 | + lockdep_on(); |
1facf9fc | 26600 | + return err; |
26601 | +} | |
26602 | + | |
26603 | +/* ---------------------------------------------------------------------- */ | |
26604 | + | |
26605 | +/* dirty workaround for strict type of fmode_t */ | |
26606 | +union vfsub_fmu { | |
26607 | + fmode_t fm; | |
26608 | + unsigned int ui; | |
26609 | +}; | |
26610 | + | |
26611 | +static inline unsigned int vfsub_fmode_to_uint(fmode_t fm) | |
26612 | +{ | |
26613 | + union vfsub_fmu u = { | |
26614 | + .fm = fm | |
26615 | + }; | |
26616 | + | |
26617 | + BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui)); | |
26618 | + | |
26619 | + return u.ui; | |
26620 | +} | |
26621 | + | |
26622 | +static inline fmode_t vfsub_uint_to_fmode(unsigned int ui) | |
26623 | +{ | |
26624 | + union vfsub_fmu u = { | |
26625 | + .ui = ui | |
26626 | + }; | |
26627 | + | |
26628 | + return u.fm; | |
26629 | +} | |
26630 | + | |
4a4d8108 AM |
26631 | +/* ---------------------------------------------------------------------- */ |
26632 | + | |
26633 | +int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode); | |
26634 | +int vfsub_sio_rmdir(struct inode *dir, struct path *path); | |
26635 | +int vfsub_sio_notify_change(struct path *path, struct iattr *ia); | |
26636 | +int vfsub_notify_change(struct path *path, struct iattr *ia); | |
26637 | +int vfsub_unlink(struct inode *dir, struct path *path, int force); | |
26638 | + | |
1facf9fc | 26639 | +#endif /* __KERNEL__ */ |
26640 | +#endif /* __AUFS_VFSUB_H__ */ | |
7f207e10 AM |
26641 | diff -urN /usr/share/empty/fs/aufs/wbr_policy.c linux/fs/aufs/wbr_policy.c |
26642 | --- /usr/share/empty/fs/aufs/wbr_policy.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 26643 | +++ linux/fs/aufs/wbr_policy.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 26644 | @@ -0,0 +1,700 @@ |
1facf9fc | 26645 | +/* |
027c5e7a | 26646 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 26647 | + * |
26648 | + * This program, aufs is free software; you can redistribute it and/or modify | |
26649 | + * it under the terms of the GNU General Public License as published by | |
26650 | + * the Free Software Foundation; either version 2 of the License, or | |
26651 | + * (at your option) any later version. | |
dece6358 AM |
26652 | + * |
26653 | + * This program is distributed in the hope that it will be useful, | |
26654 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
26655 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
26656 | + * GNU General Public License for more details. | |
26657 | + * | |
26658 | + * You should have received a copy of the GNU General Public License | |
26659 | + * along with this program; if not, write to the Free Software | |
26660 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 26661 | + */ |
26662 | + | |
26663 | +/* | |
26664 | + * policies for selecting one among multiple writable branches | |
26665 | + */ | |
26666 | + | |
26667 | +#include <linux/statfs.h> | |
26668 | +#include "aufs.h" | |
26669 | + | |
26670 | +/* subset of cpup_attr() */ | |
26671 | +static noinline_for_stack | |
26672 | +int au_cpdown_attr(struct path *h_path, struct dentry *h_src) | |
26673 | +{ | |
26674 | + int err, sbits; | |
26675 | + struct iattr ia; | |
26676 | + struct inode *h_isrc; | |
26677 | + | |
26678 | + h_isrc = h_src->d_inode; | |
26679 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE | ATTR_UID | ATTR_GID; | |
26680 | + ia.ia_mode = h_isrc->i_mode; | |
26681 | + ia.ia_uid = h_isrc->i_uid; | |
26682 | + ia.ia_gid = h_isrc->i_gid; | |
26683 | + sbits = !!(ia.ia_mode & (S_ISUID | S_ISGID)); | |
26684 | + au_cpup_attr_flags(h_path->dentry->d_inode, h_isrc); | |
26685 | + err = vfsub_sio_notify_change(h_path, &ia); | |
26686 | + | |
26687 | + /* is this nfs only? */ | |
26688 | + if (!err && sbits && au_test_nfs(h_path->dentry->d_sb)) { | |
26689 | + ia.ia_valid = ATTR_FORCE | ATTR_MODE; | |
26690 | + ia.ia_mode = h_isrc->i_mode; | |
26691 | + err = vfsub_sio_notify_change(h_path, &ia); | |
26692 | + } | |
26693 | + | |
26694 | + return err; | |
26695 | +} | |
26696 | + | |
26697 | +#define AuCpdown_PARENT_OPQ 1 | |
26698 | +#define AuCpdown_WHED (1 << 1) | |
26699 | +#define AuCpdown_MADE_DIR (1 << 2) | |
26700 | +#define AuCpdown_DIROPQ (1 << 3) | |
26701 | +#define au_ftest_cpdown(flags, name) ((flags) & AuCpdown_##name) | |
7f207e10 AM |
26702 | +#define au_fset_cpdown(flags, name) \ |
26703 | + do { (flags) |= AuCpdown_##name; } while (0) | |
26704 | +#define au_fclr_cpdown(flags, name) \ | |
26705 | + do { (flags) &= ~AuCpdown_##name; } while (0) | |
1facf9fc | 26706 | + |
26707 | +struct au_cpdown_dir_args { | |
26708 | + struct dentry *parent; | |
26709 | + unsigned int flags; | |
26710 | +}; | |
26711 | + | |
26712 | +static int au_cpdown_dir_opq(struct dentry *dentry, aufs_bindex_t bdst, | |
26713 | + struct au_cpdown_dir_args *a) | |
26714 | +{ | |
26715 | + int err; | |
26716 | + struct dentry *opq_dentry; | |
26717 | + | |
26718 | + opq_dentry = au_diropq_create(dentry, bdst); | |
26719 | + err = PTR_ERR(opq_dentry); | |
26720 | + if (IS_ERR(opq_dentry)) | |
26721 | + goto out; | |
26722 | + dput(opq_dentry); | |
26723 | + au_fset_cpdown(a->flags, DIROPQ); | |
26724 | + | |
4f0767ce | 26725 | +out: |
1facf9fc | 26726 | + return err; |
26727 | +} | |
26728 | + | |
26729 | +static int au_cpdown_dir_wh(struct dentry *dentry, struct dentry *h_parent, | |
26730 | + struct inode *dir, aufs_bindex_t bdst) | |
26731 | +{ | |
26732 | + int err; | |
26733 | + struct path h_path; | |
26734 | + struct au_branch *br; | |
26735 | + | |
26736 | + br = au_sbr(dentry->d_sb, bdst); | |
26737 | + h_path.dentry = au_wh_lkup(h_parent, &dentry->d_name, br); | |
26738 | + err = PTR_ERR(h_path.dentry); | |
26739 | + if (IS_ERR(h_path.dentry)) | |
26740 | + goto out; | |
26741 | + | |
26742 | + err = 0; | |
26743 | + if (h_path.dentry->d_inode) { | |
26744 | + h_path.mnt = br->br_mnt; | |
26745 | + err = au_wh_unlink_dentry(au_h_iptr(dir, bdst), &h_path, | |
26746 | + dentry); | |
26747 | + } | |
26748 | + dput(h_path.dentry); | |
26749 | + | |
4f0767ce | 26750 | +out: |
1facf9fc | 26751 | + return err; |
26752 | +} | |
26753 | + | |
26754 | +static int au_cpdown_dir(struct dentry *dentry, aufs_bindex_t bdst, | |
26755 | + struct dentry *h_parent, void *arg) | |
26756 | +{ | |
26757 | + int err, rerr; | |
4a4d8108 | 26758 | + aufs_bindex_t bopq, bstart; |
1facf9fc | 26759 | + struct path h_path; |
26760 | + struct dentry *parent; | |
26761 | + struct inode *h_dir, *h_inode, *inode, *dir; | |
26762 | + struct au_cpdown_dir_args *args = arg; | |
26763 | + | |
26764 | + bstart = au_dbstart(dentry); | |
26765 | + /* dentry is di-locked */ | |
26766 | + parent = dget_parent(dentry); | |
26767 | + dir = parent->d_inode; | |
26768 | + h_dir = h_parent->d_inode; | |
26769 | + AuDebugOn(h_dir != au_h_iptr(dir, bdst)); | |
26770 | + IMustLock(h_dir); | |
26771 | + | |
26772 | + err = au_lkup_neg(dentry, bdst); | |
26773 | + if (unlikely(err < 0)) | |
26774 | + goto out; | |
26775 | + h_path.dentry = au_h_dptr(dentry, bdst); | |
26776 | + h_path.mnt = au_sbr_mnt(dentry->d_sb, bdst); | |
26777 | + err = vfsub_sio_mkdir(au_h_iptr(dir, bdst), &h_path, | |
26778 | + S_IRWXU | S_IRUGO | S_IXUGO); | |
26779 | + if (unlikely(err)) | |
26780 | + goto out_put; | |
26781 | + au_fset_cpdown(args->flags, MADE_DIR); | |
26782 | + | |
1facf9fc | 26783 | + bopq = au_dbdiropq(dentry); |
26784 | + au_fclr_cpdown(args->flags, WHED); | |
26785 | + au_fclr_cpdown(args->flags, DIROPQ); | |
26786 | + if (au_dbwh(dentry) == bdst) | |
26787 | + au_fset_cpdown(args->flags, WHED); | |
26788 | + if (!au_ftest_cpdown(args->flags, PARENT_OPQ) && bopq <= bdst) | |
26789 | + au_fset_cpdown(args->flags, PARENT_OPQ); | |
1facf9fc | 26790 | + h_inode = h_path.dentry->d_inode; |
26791 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
26792 | + if (au_ftest_cpdown(args->flags, WHED)) { | |
26793 | + err = au_cpdown_dir_opq(dentry, bdst, args); | |
26794 | + if (unlikely(err)) { | |
26795 | + mutex_unlock(&h_inode->i_mutex); | |
26796 | + goto out_dir; | |
26797 | + } | |
26798 | + } | |
26799 | + | |
26800 | + err = au_cpdown_attr(&h_path, au_h_dptr(dentry, bstart)); | |
26801 | + mutex_unlock(&h_inode->i_mutex); | |
26802 | + if (unlikely(err)) | |
26803 | + goto out_opq; | |
26804 | + | |
26805 | + if (au_ftest_cpdown(args->flags, WHED)) { | |
26806 | + err = au_cpdown_dir_wh(dentry, h_parent, dir, bdst); | |
26807 | + if (unlikely(err)) | |
26808 | + goto out_opq; | |
26809 | + } | |
26810 | + | |
26811 | + inode = dentry->d_inode; | |
26812 | + if (au_ibend(inode) < bdst) | |
26813 | + au_set_ibend(inode, bdst); | |
26814 | + au_set_h_iptr(inode, bdst, au_igrab(h_inode), | |
26815 | + au_hi_flags(inode, /*isdir*/1)); | |
26816 | + goto out; /* success */ | |
26817 | + | |
26818 | + /* revert */ | |
4f0767ce | 26819 | +out_opq: |
1facf9fc | 26820 | + if (au_ftest_cpdown(args->flags, DIROPQ)) { |
26821 | + mutex_lock_nested(&h_inode->i_mutex, AuLsc_I_CHILD); | |
26822 | + rerr = au_diropq_remove(dentry, bdst); | |
26823 | + mutex_unlock(&h_inode->i_mutex); | |
26824 | + if (unlikely(rerr)) { | |
26825 | + AuIOErr("failed removing diropq for %.*s b%d (%d)\n", | |
26826 | + AuDLNPair(dentry), bdst, rerr); | |
26827 | + err = -EIO; | |
26828 | + goto out; | |
26829 | + } | |
26830 | + } | |
4f0767ce | 26831 | +out_dir: |
1facf9fc | 26832 | + if (au_ftest_cpdown(args->flags, MADE_DIR)) { |
26833 | + rerr = vfsub_sio_rmdir(au_h_iptr(dir, bdst), &h_path); | |
26834 | + if (unlikely(rerr)) { | |
26835 | + AuIOErr("failed removing %.*s b%d (%d)\n", | |
26836 | + AuDLNPair(dentry), bdst, rerr); | |
26837 | + err = -EIO; | |
26838 | + } | |
26839 | + } | |
4f0767ce | 26840 | +out_put: |
1facf9fc | 26841 | + au_set_h_dptr(dentry, bdst, NULL); |
26842 | + if (au_dbend(dentry) == bdst) | |
26843 | + au_update_dbend(dentry); | |
4f0767ce | 26844 | +out: |
1facf9fc | 26845 | + dput(parent); |
26846 | + return err; | |
26847 | +} | |
26848 | + | |
26849 | +int au_cpdown_dirs(struct dentry *dentry, aufs_bindex_t bdst) | |
26850 | +{ | |
26851 | + int err; | |
26852 | + struct au_cpdown_dir_args args = { | |
26853 | + .parent = dget_parent(dentry), | |
26854 | + .flags = 0 | |
26855 | + }; | |
26856 | + | |
26857 | + err = au_cp_dirs(dentry, bdst, au_cpdown_dir, &args); | |
26858 | + dput(args.parent); | |
26859 | + | |
26860 | + return err; | |
26861 | +} | |
26862 | + | |
26863 | +/* ---------------------------------------------------------------------- */ | |
26864 | + | |
26865 | +/* policies for create */ | |
26866 | + | |
4a4d8108 AM |
26867 | +static int au_wbr_nonopq(struct dentry *dentry, aufs_bindex_t bindex) |
26868 | +{ | |
26869 | + int err, i, j, ndentry; | |
26870 | + aufs_bindex_t bopq; | |
26871 | + struct au_dcsub_pages dpages; | |
26872 | + struct au_dpage *dpage; | |
26873 | + struct dentry **dentries, *parent, *d; | |
26874 | + | |
26875 | + err = au_dpages_init(&dpages, GFP_NOFS); | |
26876 | + if (unlikely(err)) | |
26877 | + goto out; | |
26878 | + parent = dget_parent(dentry); | |
027c5e7a | 26879 | + err = au_dcsub_pages_rev_aufs(&dpages, parent, /*do_include*/0); |
4a4d8108 AM |
26880 | + if (unlikely(err)) |
26881 | + goto out_free; | |
26882 | + | |
26883 | + err = bindex; | |
26884 | + for (i = 0; i < dpages.ndpage; i++) { | |
26885 | + dpage = dpages.dpages + i; | |
26886 | + dentries = dpage->dentries; | |
26887 | + ndentry = dpage->ndentry; | |
26888 | + for (j = 0; j < ndentry; j++) { | |
26889 | + d = dentries[j]; | |
26890 | + di_read_lock_parent2(d, !AuLock_IR); | |
26891 | + bopq = au_dbdiropq(d); | |
26892 | + di_read_unlock(d, !AuLock_IR); | |
26893 | + if (bopq >= 0 && bopq < err) | |
26894 | + err = bopq; | |
26895 | + } | |
26896 | + } | |
26897 | + | |
26898 | +out_free: | |
26899 | + dput(parent); | |
26900 | + au_dpages_free(&dpages); | |
26901 | +out: | |
26902 | + return err; | |
26903 | +} | |
26904 | + | |
1facf9fc | 26905 | +static int au_wbr_bu(struct super_block *sb, aufs_bindex_t bindex) |
26906 | +{ | |
26907 | + for (; bindex >= 0; bindex--) | |
26908 | + if (!au_br_rdonly(au_sbr(sb, bindex))) | |
26909 | + return bindex; | |
26910 | + return -EROFS; | |
26911 | +} | |
26912 | + | |
26913 | +/* top down parent */ | |
26914 | +static int au_wbr_create_tdp(struct dentry *dentry, int isdir __maybe_unused) | |
26915 | +{ | |
26916 | + int err; | |
26917 | + aufs_bindex_t bstart, bindex; | |
26918 | + struct super_block *sb; | |
26919 | + struct dentry *parent, *h_parent; | |
26920 | + | |
26921 | + sb = dentry->d_sb; | |
26922 | + bstart = au_dbstart(dentry); | |
26923 | + err = bstart; | |
26924 | + if (!au_br_rdonly(au_sbr(sb, bstart))) | |
26925 | + goto out; | |
26926 | + | |
26927 | + err = -EROFS; | |
26928 | + parent = dget_parent(dentry); | |
26929 | + for (bindex = au_dbstart(parent); bindex < bstart; bindex++) { | |
26930 | + h_parent = au_h_dptr(parent, bindex); | |
26931 | + if (!h_parent || !h_parent->d_inode) | |
26932 | + continue; | |
26933 | + | |
26934 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
26935 | + err = bindex; | |
26936 | + break; | |
26937 | + } | |
26938 | + } | |
26939 | + dput(parent); | |
26940 | + | |
26941 | + /* bottom up here */ | |
4a4d8108 | 26942 | + if (unlikely(err < 0)) { |
1facf9fc | 26943 | + err = au_wbr_bu(sb, bstart - 1); |
4a4d8108 AM |
26944 | + if (err >= 0) |
26945 | + err = au_wbr_nonopq(dentry, err); | |
26946 | + } | |
1facf9fc | 26947 | + |
4f0767ce | 26948 | +out: |
1facf9fc | 26949 | + AuDbg("b%d\n", err); |
26950 | + return err; | |
26951 | +} | |
26952 | + | |
26953 | +/* ---------------------------------------------------------------------- */ | |
26954 | + | |
26955 | +/* an exception for the policy other than tdp */ | |
26956 | +static int au_wbr_create_exp(struct dentry *dentry) | |
26957 | +{ | |
26958 | + int err; | |
26959 | + aufs_bindex_t bwh, bdiropq; | |
26960 | + struct dentry *parent; | |
26961 | + | |
26962 | + err = -1; | |
26963 | + bwh = au_dbwh(dentry); | |
26964 | + parent = dget_parent(dentry); | |
26965 | + bdiropq = au_dbdiropq(parent); | |
26966 | + if (bwh >= 0) { | |
26967 | + if (bdiropq >= 0) | |
26968 | + err = min(bdiropq, bwh); | |
26969 | + else | |
26970 | + err = bwh; | |
26971 | + AuDbg("%d\n", err); | |
26972 | + } else if (bdiropq >= 0) { | |
26973 | + err = bdiropq; | |
26974 | + AuDbg("%d\n", err); | |
26975 | + } | |
26976 | + dput(parent); | |
26977 | + | |
4a4d8108 AM |
26978 | + if (err >= 0) |
26979 | + err = au_wbr_nonopq(dentry, err); | |
26980 | + | |
1facf9fc | 26981 | + if (err >= 0 && au_br_rdonly(au_sbr(dentry->d_sb, err))) |
26982 | + err = -1; | |
26983 | + | |
26984 | + AuDbg("%d\n", err); | |
26985 | + return err; | |
26986 | +} | |
26987 | + | |
26988 | +/* ---------------------------------------------------------------------- */ | |
26989 | + | |
26990 | +/* round robin */ | |
26991 | +static int au_wbr_create_init_rr(struct super_block *sb) | |
26992 | +{ | |
26993 | + int err; | |
26994 | + | |
26995 | + err = au_wbr_bu(sb, au_sbend(sb)); | |
26996 | + atomic_set(&au_sbi(sb)->si_wbr_rr_next, -err); /* less important */ | |
dece6358 | 26997 | + /* smp_mb(); */ |
1facf9fc | 26998 | + |
26999 | + AuDbg("b%d\n", err); | |
27000 | + return err; | |
27001 | +} | |
27002 | + | |
27003 | +static int au_wbr_create_rr(struct dentry *dentry, int isdir) | |
27004 | +{ | |
27005 | + int err, nbr; | |
27006 | + unsigned int u; | |
27007 | + aufs_bindex_t bindex, bend; | |
27008 | + struct super_block *sb; | |
27009 | + atomic_t *next; | |
27010 | + | |
27011 | + err = au_wbr_create_exp(dentry); | |
27012 | + if (err >= 0) | |
27013 | + goto out; | |
27014 | + | |
27015 | + sb = dentry->d_sb; | |
27016 | + next = &au_sbi(sb)->si_wbr_rr_next; | |
27017 | + bend = au_sbend(sb); | |
27018 | + nbr = bend + 1; | |
27019 | + for (bindex = 0; bindex <= bend; bindex++) { | |
27020 | + if (!isdir) { | |
27021 | + err = atomic_dec_return(next) + 1; | |
27022 | + /* modulo for 0 is meaningless */ | |
27023 | + if (unlikely(!err)) | |
27024 | + err = atomic_dec_return(next) + 1; | |
27025 | + } else | |
27026 | + err = atomic_read(next); | |
27027 | + AuDbg("%d\n", err); | |
27028 | + u = err; | |
27029 | + err = u % nbr; | |
27030 | + AuDbg("%d\n", err); | |
27031 | + if (!au_br_rdonly(au_sbr(sb, err))) | |
27032 | + break; | |
27033 | + err = -EROFS; | |
27034 | + } | |
27035 | + | |
4a4d8108 AM |
27036 | + if (err >= 0) |
27037 | + err = au_wbr_nonopq(dentry, err); | |
27038 | + | |
4f0767ce | 27039 | +out: |
1facf9fc | 27040 | + AuDbg("%d\n", err); |
27041 | + return err; | |
27042 | +} | |
27043 | + | |
27044 | +/* ---------------------------------------------------------------------- */ | |
27045 | + | |
27046 | +/* most free space */ | |
27047 | +static void au_mfs(struct dentry *dentry) | |
27048 | +{ | |
27049 | + struct super_block *sb; | |
27050 | + struct au_branch *br; | |
27051 | + struct au_wbr_mfs *mfs; | |
27052 | + aufs_bindex_t bindex, bend; | |
27053 | + int err; | |
27054 | + unsigned long long b, bavail; | |
7f207e10 | 27055 | + struct path h_path; |
1facf9fc | 27056 | + /* reduce the stack usage */ |
27057 | + struct kstatfs *st; | |
27058 | + | |
27059 | + st = kmalloc(sizeof(*st), GFP_NOFS); | |
27060 | + if (unlikely(!st)) { | |
27061 | + AuWarn1("failed updating mfs(%d), ignored\n", -ENOMEM); | |
27062 | + return; | |
27063 | + } | |
27064 | + | |
27065 | + bavail = 0; | |
27066 | + sb = dentry->d_sb; | |
27067 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
dece6358 | 27068 | + MtxMustLock(&mfs->mfs_lock); |
1facf9fc | 27069 | + mfs->mfs_bindex = -EROFS; |
27070 | + mfs->mfsrr_bytes = 0; | |
27071 | + bend = au_sbend(sb); | |
27072 | + for (bindex = 0; bindex <= bend; bindex++) { | |
27073 | + br = au_sbr(sb, bindex); | |
27074 | + if (au_br_rdonly(br)) | |
27075 | + continue; | |
27076 | + | |
27077 | + /* sb->s_root for NFS is unreliable */ | |
7f207e10 AM |
27078 | + h_path.mnt = br->br_mnt; |
27079 | + h_path.dentry = h_path.mnt->mnt_root; | |
27080 | + err = vfs_statfs(&h_path, st); | |
1facf9fc | 27081 | + if (unlikely(err)) { |
27082 | + AuWarn1("failed statfs, b%d, %d\n", bindex, err); | |
27083 | + continue; | |
27084 | + } | |
27085 | + | |
27086 | + /* when the available size is equal, select the lower one */ | |
27087 | + BUILD_BUG_ON(sizeof(b) < sizeof(st->f_bavail) | |
27088 | + || sizeof(b) < sizeof(st->f_bsize)); | |
27089 | + b = st->f_bavail * st->f_bsize; | |
27090 | + br->br_wbr->wbr_bytes = b; | |
27091 | + if (b >= bavail) { | |
27092 | + bavail = b; | |
27093 | + mfs->mfs_bindex = bindex; | |
27094 | + mfs->mfs_jiffy = jiffies; | |
27095 | + } | |
27096 | + } | |
27097 | + | |
27098 | + mfs->mfsrr_bytes = bavail; | |
27099 | + AuDbg("b%d\n", mfs->mfs_bindex); | |
27100 | + kfree(st); | |
27101 | +} | |
27102 | + | |
27103 | +static int au_wbr_create_mfs(struct dentry *dentry, int isdir __maybe_unused) | |
27104 | +{ | |
27105 | + int err; | |
27106 | + struct super_block *sb; | |
27107 | + struct au_wbr_mfs *mfs; | |
27108 | + | |
27109 | + err = au_wbr_create_exp(dentry); | |
27110 | + if (err >= 0) | |
27111 | + goto out; | |
27112 | + | |
27113 | + sb = dentry->d_sb; | |
27114 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
27115 | + mutex_lock(&mfs->mfs_lock); | |
27116 | + if (time_after(jiffies, mfs->mfs_jiffy + mfs->mfs_expire) | |
27117 | + || mfs->mfs_bindex < 0 | |
27118 | + || au_br_rdonly(au_sbr(sb, mfs->mfs_bindex))) | |
27119 | + au_mfs(dentry); | |
27120 | + mutex_unlock(&mfs->mfs_lock); | |
27121 | + err = mfs->mfs_bindex; | |
27122 | + | |
4a4d8108 AM |
27123 | + if (err >= 0) |
27124 | + err = au_wbr_nonopq(dentry, err); | |
27125 | + | |
4f0767ce | 27126 | +out: |
1facf9fc | 27127 | + AuDbg("b%d\n", err); |
27128 | + return err; | |
27129 | +} | |
27130 | + | |
27131 | +static int au_wbr_create_init_mfs(struct super_block *sb) | |
27132 | +{ | |
27133 | + struct au_wbr_mfs *mfs; | |
27134 | + | |
27135 | + mfs = &au_sbi(sb)->si_wbr_mfs; | |
27136 | + mutex_init(&mfs->mfs_lock); | |
27137 | + mfs->mfs_jiffy = 0; | |
27138 | + mfs->mfs_bindex = -EROFS; | |
27139 | + | |
27140 | + return 0; | |
27141 | +} | |
27142 | + | |
27143 | +static int au_wbr_create_fin_mfs(struct super_block *sb __maybe_unused) | |
27144 | +{ | |
27145 | + mutex_destroy(&au_sbi(sb)->si_wbr_mfs.mfs_lock); | |
27146 | + return 0; | |
27147 | +} | |
27148 | + | |
27149 | +/* ---------------------------------------------------------------------- */ | |
27150 | + | |
27151 | +/* most free space and then round robin */ | |
27152 | +static int au_wbr_create_mfsrr(struct dentry *dentry, int isdir) | |
27153 | +{ | |
27154 | + int err; | |
27155 | + struct au_wbr_mfs *mfs; | |
27156 | + | |
27157 | + err = au_wbr_create_mfs(dentry, isdir); | |
27158 | + if (err >= 0) { | |
27159 | + mfs = &au_sbi(dentry->d_sb)->si_wbr_mfs; | |
dece6358 | 27160 | + mutex_lock(&mfs->mfs_lock); |
1facf9fc | 27161 | + if (mfs->mfsrr_bytes < mfs->mfsrr_watermark) |
27162 | + err = au_wbr_create_rr(dentry, isdir); | |
dece6358 | 27163 | + mutex_unlock(&mfs->mfs_lock); |
1facf9fc | 27164 | + } |
27165 | + | |
27166 | + AuDbg("b%d\n", err); | |
27167 | + return err; | |
27168 | +} | |
27169 | + | |
27170 | +static int au_wbr_create_init_mfsrr(struct super_block *sb) | |
27171 | +{ | |
27172 | + int err; | |
27173 | + | |
27174 | + au_wbr_create_init_mfs(sb); /* ignore */ | |
27175 | + err = au_wbr_create_init_rr(sb); | |
27176 | + | |
27177 | + return err; | |
27178 | +} | |
27179 | + | |
27180 | +/* ---------------------------------------------------------------------- */ | |
27181 | + | |
27182 | +/* top down parent and most free space */ | |
27183 | +static int au_wbr_create_pmfs(struct dentry *dentry, int isdir) | |
27184 | +{ | |
27185 | + int err, e2; | |
27186 | + unsigned long long b; | |
27187 | + aufs_bindex_t bindex, bstart, bend; | |
27188 | + struct super_block *sb; | |
27189 | + struct dentry *parent, *h_parent; | |
27190 | + struct au_branch *br; | |
27191 | + | |
27192 | + err = au_wbr_create_tdp(dentry, isdir); | |
27193 | + if (unlikely(err < 0)) | |
27194 | + goto out; | |
27195 | + parent = dget_parent(dentry); | |
27196 | + bstart = au_dbstart(parent); | |
27197 | + bend = au_dbtaildir(parent); | |
27198 | + if (bstart == bend) | |
27199 | + goto out_parent; /* success */ | |
27200 | + | |
27201 | + e2 = au_wbr_create_mfs(dentry, isdir); | |
27202 | + if (e2 < 0) | |
27203 | + goto out_parent; /* success */ | |
27204 | + | |
27205 | + /* when the available size is equal, select upper one */ | |
27206 | + sb = dentry->d_sb; | |
27207 | + br = au_sbr(sb, err); | |
27208 | + b = br->br_wbr->wbr_bytes; | |
27209 | + AuDbg("b%d, %llu\n", err, b); | |
27210 | + | |
27211 | + for (bindex = bstart; bindex <= bend; bindex++) { | |
27212 | + h_parent = au_h_dptr(parent, bindex); | |
27213 | + if (!h_parent || !h_parent->d_inode) | |
27214 | + continue; | |
27215 | + | |
27216 | + br = au_sbr(sb, bindex); | |
27217 | + if (!au_br_rdonly(br) && br->br_wbr->wbr_bytes > b) { | |
27218 | + b = br->br_wbr->wbr_bytes; | |
27219 | + err = bindex; | |
27220 | + AuDbg("b%d, %llu\n", err, b); | |
27221 | + } | |
27222 | + } | |
27223 | + | |
4a4d8108 AM |
27224 | + if (err >= 0) |
27225 | + err = au_wbr_nonopq(dentry, err); | |
27226 | + | |
4f0767ce | 27227 | +out_parent: |
1facf9fc | 27228 | + dput(parent); |
4f0767ce | 27229 | +out: |
1facf9fc | 27230 | + AuDbg("b%d\n", err); |
27231 | + return err; | |
27232 | +} | |
27233 | + | |
27234 | +/* ---------------------------------------------------------------------- */ | |
27235 | + | |
27236 | +/* policies for copyup */ | |
27237 | + | |
27238 | +/* top down parent */ | |
27239 | +static int au_wbr_copyup_tdp(struct dentry *dentry) | |
27240 | +{ | |
27241 | + return au_wbr_create_tdp(dentry, /*isdir, anything is ok*/0); | |
27242 | +} | |
27243 | + | |
27244 | +/* bottom up parent */ | |
27245 | +static int au_wbr_copyup_bup(struct dentry *dentry) | |
27246 | +{ | |
27247 | + int err; | |
27248 | + aufs_bindex_t bindex, bstart; | |
27249 | + struct dentry *parent, *h_parent; | |
27250 | + struct super_block *sb; | |
27251 | + | |
27252 | + err = -EROFS; | |
27253 | + sb = dentry->d_sb; | |
27254 | + parent = dget_parent(dentry); | |
27255 | + bstart = au_dbstart(parent); | |
27256 | + for (bindex = au_dbstart(dentry); bindex >= bstart; bindex--) { | |
27257 | + h_parent = au_h_dptr(parent, bindex); | |
27258 | + if (!h_parent || !h_parent->d_inode) | |
27259 | + continue; | |
27260 | + | |
27261 | + if (!au_br_rdonly(au_sbr(sb, bindex))) { | |
27262 | + err = bindex; | |
27263 | + break; | |
27264 | + } | |
27265 | + } | |
27266 | + dput(parent); | |
27267 | + | |
27268 | + /* bottom up here */ | |
27269 | + if (unlikely(err < 0)) | |
27270 | + err = au_wbr_bu(sb, bstart - 1); | |
27271 | + | |
27272 | + AuDbg("b%d\n", err); | |
27273 | + return err; | |
27274 | +} | |
27275 | + | |
27276 | +/* bottom up */ | |
27277 | +static int au_wbr_copyup_bu(struct dentry *dentry) | |
27278 | +{ | |
27279 | + int err; | |
4a4d8108 | 27280 | + aufs_bindex_t bstart; |
1facf9fc | 27281 | + |
4a4d8108 AM |
27282 | + bstart = au_dbstart(dentry); |
27283 | + err = au_wbr_bu(dentry->d_sb, bstart); | |
27284 | + AuDbg("b%d\n", err); | |
27285 | + if (err > bstart) | |
27286 | + err = au_wbr_nonopq(dentry, err); | |
1facf9fc | 27287 | + |
27288 | + AuDbg("b%d\n", err); | |
27289 | + return err; | |
27290 | +} | |
27291 | + | |
27292 | +/* ---------------------------------------------------------------------- */ | |
27293 | + | |
27294 | +struct au_wbr_copyup_operations au_wbr_copyup_ops[] = { | |
27295 | + [AuWbrCopyup_TDP] = { | |
27296 | + .copyup = au_wbr_copyup_tdp | |
27297 | + }, | |
27298 | + [AuWbrCopyup_BUP] = { | |
27299 | + .copyup = au_wbr_copyup_bup | |
27300 | + }, | |
27301 | + [AuWbrCopyup_BU] = { | |
27302 | + .copyup = au_wbr_copyup_bu | |
27303 | + } | |
27304 | +}; | |
27305 | + | |
27306 | +struct au_wbr_create_operations au_wbr_create_ops[] = { | |
27307 | + [AuWbrCreate_TDP] = { | |
27308 | + .create = au_wbr_create_tdp | |
27309 | + }, | |
27310 | + [AuWbrCreate_RR] = { | |
27311 | + .create = au_wbr_create_rr, | |
27312 | + .init = au_wbr_create_init_rr | |
27313 | + }, | |
27314 | + [AuWbrCreate_MFS] = { | |
27315 | + .create = au_wbr_create_mfs, | |
27316 | + .init = au_wbr_create_init_mfs, | |
27317 | + .fin = au_wbr_create_fin_mfs | |
27318 | + }, | |
27319 | + [AuWbrCreate_MFSV] = { | |
27320 | + .create = au_wbr_create_mfs, | |
27321 | + .init = au_wbr_create_init_mfs, | |
27322 | + .fin = au_wbr_create_fin_mfs | |
27323 | + }, | |
27324 | + [AuWbrCreate_MFSRR] = { | |
27325 | + .create = au_wbr_create_mfsrr, | |
27326 | + .init = au_wbr_create_init_mfsrr, | |
27327 | + .fin = au_wbr_create_fin_mfs | |
27328 | + }, | |
27329 | + [AuWbrCreate_MFSRRV] = { | |
27330 | + .create = au_wbr_create_mfsrr, | |
27331 | + .init = au_wbr_create_init_mfsrr, | |
27332 | + .fin = au_wbr_create_fin_mfs | |
27333 | + }, | |
27334 | + [AuWbrCreate_PMFS] = { | |
27335 | + .create = au_wbr_create_pmfs, | |
27336 | + .init = au_wbr_create_init_mfs, | |
27337 | + .fin = au_wbr_create_fin_mfs | |
27338 | + }, | |
27339 | + [AuWbrCreate_PMFSV] = { | |
27340 | + .create = au_wbr_create_pmfs, | |
27341 | + .init = au_wbr_create_init_mfs, | |
27342 | + .fin = au_wbr_create_fin_mfs | |
27343 | + } | |
27344 | +}; | |
7f207e10 AM |
27345 | diff -urN /usr/share/empty/fs/aufs/whout.c linux/fs/aufs/whout.c |
27346 | --- /usr/share/empty/fs/aufs/whout.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 27347 | +++ linux/fs/aufs/whout.c 2011-08-24 13:30:24.734646739 +0200 |
027c5e7a | 27348 | @@ -0,0 +1,1062 @@ |
1facf9fc | 27349 | +/* |
027c5e7a | 27350 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 27351 | + * |
27352 | + * This program, aufs is free software; you can redistribute it and/or modify | |
27353 | + * it under the terms of the GNU General Public License as published by | |
27354 | + * the Free Software Foundation; either version 2 of the License, or | |
27355 | + * (at your option) any later version. | |
dece6358 AM |
27356 | + * |
27357 | + * This program is distributed in the hope that it will be useful, | |
27358 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
27359 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
27360 | + * GNU General Public License for more details. | |
27361 | + * | |
27362 | + * You should have received a copy of the GNU General Public License | |
27363 | + * along with this program; if not, write to the Free Software | |
27364 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 27365 | + */ |
27366 | + | |
27367 | +/* | |
27368 | + * whiteout for logical deletion and opaque directory | |
27369 | + */ | |
27370 | + | |
27371 | +#include <linux/fs.h> | |
27372 | +#include "aufs.h" | |
27373 | + | |
27374 | +#define WH_MASK S_IRUGO | |
27375 | + | |
27376 | +/* | |
27377 | + * If a directory contains this file, then it is opaque. We start with the | |
27378 | + * .wh. flag so that it is blocked by lookup. | |
27379 | + */ | |
27380 | +static struct qstr diropq_name = { | |
27381 | + .name = AUFS_WH_DIROPQ, | |
27382 | + .len = sizeof(AUFS_WH_DIROPQ) - 1 | |
27383 | +}; | |
27384 | + | |
27385 | +/* | |
27386 | + * generate whiteout name, which is NOT terminated by NULL. | |
27387 | + * @name: original d_name.name | |
27388 | + * @len: original d_name.len | |
27389 | + * @wh: whiteout qstr | |
27390 | + * returns zero when succeeds, otherwise error. | |
27391 | + * succeeded value as wh->name should be freed by kfree(). | |
27392 | + */ | |
27393 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name) | |
27394 | +{ | |
27395 | + char *p; | |
27396 | + | |
27397 | + if (unlikely(name->len > PATH_MAX - AUFS_WH_PFX_LEN)) | |
27398 | + return -ENAMETOOLONG; | |
27399 | + | |
27400 | + wh->len = name->len + AUFS_WH_PFX_LEN; | |
27401 | + p = kmalloc(wh->len, GFP_NOFS); | |
27402 | + wh->name = p; | |
27403 | + if (p) { | |
27404 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
27405 | + memcpy(p + AUFS_WH_PFX_LEN, name->name, name->len); | |
27406 | + /* smp_mb(); */ | |
27407 | + return 0; | |
27408 | + } | |
27409 | + return -ENOMEM; | |
27410 | +} | |
27411 | + | |
27412 | +/* ---------------------------------------------------------------------- */ | |
27413 | + | |
27414 | +/* | |
27415 | + * test if the @wh_name exists under @h_parent. | |
27416 | + * @try_sio specifies the necessary of super-io. | |
27417 | + */ | |
27418 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, | |
27419 | + struct au_branch *br, int try_sio) | |
27420 | +{ | |
27421 | + int err; | |
27422 | + struct dentry *wh_dentry; | |
1facf9fc | 27423 | + |
1facf9fc | 27424 | + if (!try_sio) |
27425 | + wh_dentry = au_lkup_one(wh_name, h_parent, br, /*nd*/NULL); | |
27426 | + else | |
27427 | + wh_dentry = au_sio_lkup_one(wh_name, h_parent, br); | |
27428 | + err = PTR_ERR(wh_dentry); | |
27429 | + if (IS_ERR(wh_dentry)) | |
27430 | + goto out; | |
27431 | + | |
27432 | + err = 0; | |
27433 | + if (!wh_dentry->d_inode) | |
27434 | + goto out_wh; /* success */ | |
27435 | + | |
27436 | + err = 1; | |
27437 | + if (S_ISREG(wh_dentry->d_inode->i_mode)) | |
27438 | + goto out_wh; /* success */ | |
27439 | + | |
27440 | + err = -EIO; | |
27441 | + AuIOErr("%.*s Invalid whiteout entry type 0%o.\n", | |
27442 | + AuDLNPair(wh_dentry), wh_dentry->d_inode->i_mode); | |
27443 | + | |
4f0767ce | 27444 | +out_wh: |
1facf9fc | 27445 | + dput(wh_dentry); |
4f0767ce | 27446 | +out: |
1facf9fc | 27447 | + return err; |
27448 | +} | |
27449 | + | |
27450 | +/* | |
27451 | + * test if the @h_dentry sets opaque or not. | |
27452 | + */ | |
27453 | +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br) | |
27454 | +{ | |
27455 | + int err; | |
27456 | + struct inode *h_dir; | |
27457 | + | |
27458 | + h_dir = h_dentry->d_inode; | |
27459 | + err = au_wh_test(h_dentry, &diropq_name, br, | |
27460 | + au_test_h_perm_sio(h_dir, MAY_EXEC)); | |
27461 | + return err; | |
27462 | +} | |
27463 | + | |
27464 | +/* | |
27465 | + * returns a negative dentry whose name is unique and temporary. | |
27466 | + */ | |
27467 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
27468 | + struct qstr *prefix) | |
27469 | +{ | |
1facf9fc | 27470 | + struct dentry *dentry; |
27471 | + int i; | |
027c5e7a | 27472 | + char defname[NAME_MAX - AUFS_MAX_NAMELEN + DNAME_INLINE_LEN + 1], |
4a4d8108 | 27473 | + *name, *p; |
027c5e7a | 27474 | + /* strict atomic_t is unnecessary here */ |
1facf9fc | 27475 | + static unsigned short cnt; |
27476 | + struct qstr qs; | |
27477 | + | |
4a4d8108 AM |
27478 | + BUILD_BUG_ON(sizeof(cnt) * 2 > AUFS_WH_TMP_LEN); |
27479 | + | |
1facf9fc | 27480 | + name = defname; |
027c5e7a AM |
27481 | + qs.len = sizeof(defname) - DNAME_INLINE_LEN + prefix->len - 1; |
27482 | + if (unlikely(prefix->len > DNAME_INLINE_LEN)) { | |
1facf9fc | 27483 | + dentry = ERR_PTR(-ENAMETOOLONG); |
4a4d8108 | 27484 | + if (unlikely(qs.len > NAME_MAX)) |
1facf9fc | 27485 | + goto out; |
27486 | + dentry = ERR_PTR(-ENOMEM); | |
27487 | + name = kmalloc(qs.len + 1, GFP_NOFS); | |
27488 | + if (unlikely(!name)) | |
27489 | + goto out; | |
27490 | + } | |
27491 | + | |
27492 | + /* doubly whiteout-ed */ | |
27493 | + memcpy(name, AUFS_WH_PFX AUFS_WH_PFX, AUFS_WH_PFX_LEN * 2); | |
27494 | + p = name + AUFS_WH_PFX_LEN * 2; | |
27495 | + memcpy(p, prefix->name, prefix->len); | |
27496 | + p += prefix->len; | |
27497 | + *p++ = '.'; | |
4a4d8108 | 27498 | + AuDebugOn(name + qs.len + 1 - p <= AUFS_WH_TMP_LEN); |
1facf9fc | 27499 | + |
27500 | + qs.name = name; | |
27501 | + for (i = 0; i < 3; i++) { | |
b752ccd1 | 27502 | + sprintf(p, "%.*x", AUFS_WH_TMP_LEN, cnt++); |
1facf9fc | 27503 | + dentry = au_sio_lkup_one(&qs, h_parent, br); |
27504 | + if (IS_ERR(dentry) || !dentry->d_inode) | |
27505 | + goto out_name; | |
27506 | + dput(dentry); | |
27507 | + } | |
4a4d8108 | 27508 | + /* pr_warning("could not get random name\n"); */ |
1facf9fc | 27509 | + dentry = ERR_PTR(-EEXIST); |
27510 | + AuDbg("%.*s\n", AuLNPair(&qs)); | |
27511 | + BUG(); | |
27512 | + | |
4f0767ce | 27513 | +out_name: |
1facf9fc | 27514 | + if (name != defname) |
27515 | + kfree(name); | |
4f0767ce | 27516 | +out: |
4a4d8108 | 27517 | + AuTraceErrPtr(dentry); |
1facf9fc | 27518 | + return dentry; |
1facf9fc | 27519 | +} |
27520 | + | |
27521 | +/* | |
27522 | + * rename the @h_dentry on @br to the whiteouted temporary name. | |
27523 | + */ | |
27524 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br) | |
27525 | +{ | |
27526 | + int err; | |
27527 | + struct path h_path = { | |
27528 | + .mnt = br->br_mnt | |
27529 | + }; | |
27530 | + struct inode *h_dir; | |
27531 | + struct dentry *h_parent; | |
27532 | + | |
27533 | + h_parent = h_dentry->d_parent; /* dir inode is locked */ | |
27534 | + h_dir = h_parent->d_inode; | |
27535 | + IMustLock(h_dir); | |
27536 | + | |
27537 | + h_path.dentry = au_whtmp_lkup(h_parent, br, &h_dentry->d_name); | |
27538 | + err = PTR_ERR(h_path.dentry); | |
27539 | + if (IS_ERR(h_path.dentry)) | |
27540 | + goto out; | |
27541 | + | |
27542 | + /* under the same dir, no need to lock_rename() */ | |
27543 | + err = vfsub_rename(h_dir, h_dentry, h_dir, &h_path); | |
27544 | + AuTraceErr(err); | |
27545 | + dput(h_path.dentry); | |
27546 | + | |
4f0767ce | 27547 | +out: |
4a4d8108 | 27548 | + AuTraceErr(err); |
1facf9fc | 27549 | + return err; |
27550 | +} | |
27551 | + | |
27552 | +/* ---------------------------------------------------------------------- */ | |
27553 | +/* | |
27554 | + * functions for removing a whiteout | |
27555 | + */ | |
27556 | + | |
27557 | +static int do_unlink_wh(struct inode *h_dir, struct path *h_path) | |
27558 | +{ | |
27559 | + int force; | |
27560 | + | |
27561 | + /* | |
27562 | + * forces superio when the dir has a sticky bit. | |
27563 | + * this may be a violation of unix fs semantics. | |
27564 | + */ | |
27565 | + force = (h_dir->i_mode & S_ISVTX) | |
27566 | + && h_path->dentry->d_inode->i_uid != current_fsuid(); | |
27567 | + return vfsub_unlink(h_dir, h_path, force); | |
27568 | +} | |
27569 | + | |
27570 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
27571 | + struct dentry *dentry) | |
27572 | +{ | |
27573 | + int err; | |
27574 | + | |
27575 | + err = do_unlink_wh(h_dir, h_path); | |
27576 | + if (!err && dentry) | |
27577 | + au_set_dbwh(dentry, -1); | |
27578 | + | |
27579 | + return err; | |
27580 | +} | |
27581 | + | |
27582 | +static int unlink_wh_name(struct dentry *h_parent, struct qstr *wh, | |
27583 | + struct au_branch *br) | |
27584 | +{ | |
27585 | + int err; | |
27586 | + struct path h_path = { | |
27587 | + .mnt = br->br_mnt | |
27588 | + }; | |
27589 | + | |
27590 | + err = 0; | |
27591 | + h_path.dentry = au_lkup_one(wh, h_parent, br, /*nd*/NULL); | |
27592 | + if (IS_ERR(h_path.dentry)) | |
27593 | + err = PTR_ERR(h_path.dentry); | |
27594 | + else { | |
27595 | + if (h_path.dentry->d_inode | |
27596 | + && S_ISREG(h_path.dentry->d_inode->i_mode)) | |
27597 | + err = do_unlink_wh(h_parent->d_inode, &h_path); | |
27598 | + dput(h_path.dentry); | |
27599 | + } | |
27600 | + | |
27601 | + return err; | |
27602 | +} | |
27603 | + | |
27604 | +/* ---------------------------------------------------------------------- */ | |
27605 | +/* | |
27606 | + * initialize/clean whiteout for a branch | |
27607 | + */ | |
27608 | + | |
27609 | +static void au_wh_clean(struct inode *h_dir, struct path *whpath, | |
27610 | + const int isdir) | |
27611 | +{ | |
27612 | + int err; | |
27613 | + | |
27614 | + if (!whpath->dentry->d_inode) | |
27615 | + return; | |
27616 | + | |
27617 | + err = mnt_want_write(whpath->mnt); | |
27618 | + if (!err) { | |
27619 | + if (isdir) | |
27620 | + err = vfsub_rmdir(h_dir, whpath); | |
27621 | + else | |
27622 | + err = vfsub_unlink(h_dir, whpath, /*force*/0); | |
27623 | + mnt_drop_write(whpath->mnt); | |
27624 | + } | |
27625 | + if (unlikely(err)) | |
4a4d8108 AM |
27626 | + pr_warning("failed removing %.*s (%d), ignored.\n", |
27627 | + AuDLNPair(whpath->dentry), err); | |
1facf9fc | 27628 | +} |
27629 | + | |
27630 | +static int test_linkable(struct dentry *h_root) | |
27631 | +{ | |
27632 | + struct inode *h_dir = h_root->d_inode; | |
27633 | + | |
27634 | + if (h_dir->i_op->link) | |
27635 | + return 0; | |
27636 | + | |
4a4d8108 AM |
27637 | + pr_err("%.*s (%s) doesn't support link(2), use noplink and rw+nolwh\n", |
27638 | + AuDLNPair(h_root), au_sbtype(h_root->d_sb)); | |
1facf9fc | 27639 | + return -ENOSYS; |
27640 | +} | |
27641 | + | |
27642 | +/* todo: should this mkdir be done in /sbin/mount.aufs helper? */ | |
27643 | +static int au_whdir(struct inode *h_dir, struct path *path) | |
27644 | +{ | |
27645 | + int err; | |
27646 | + | |
27647 | + err = -EEXIST; | |
27648 | + if (!path->dentry->d_inode) { | |
27649 | + int mode = S_IRWXU; | |
27650 | + | |
27651 | + if (au_test_nfs(path->dentry->d_sb)) | |
27652 | + mode |= S_IXUGO; | |
27653 | + err = mnt_want_write(path->mnt); | |
27654 | + if (!err) { | |
27655 | + err = vfsub_mkdir(h_dir, path, mode); | |
27656 | + mnt_drop_write(path->mnt); | |
27657 | + } | |
27658 | + } else if (S_ISDIR(path->dentry->d_inode->i_mode)) | |
27659 | + err = 0; | |
27660 | + else | |
4a4d8108 | 27661 | + pr_err("unknown %.*s exists\n", AuDLNPair(path->dentry)); |
1facf9fc | 27662 | + |
27663 | + return err; | |
27664 | +} | |
27665 | + | |
27666 | +struct au_wh_base { | |
27667 | + const struct qstr *name; | |
27668 | + struct dentry *dentry; | |
27669 | +}; | |
27670 | + | |
27671 | +static void au_wh_init_ro(struct inode *h_dir, struct au_wh_base base[], | |
27672 | + struct path *h_path) | |
27673 | +{ | |
27674 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
27675 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
27676 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
27677 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
27678 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
27679 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
27680 | +} | |
27681 | + | |
27682 | +/* | |
27683 | + * returns tri-state, | |
27684 | + * minus: error, caller should print the mesage | |
27685 | + * zero: succuess | |
27686 | + * plus: error, caller should NOT print the mesage | |
27687 | + */ | |
27688 | +static int au_wh_init_rw_nolink(struct dentry *h_root, struct au_wbr *wbr, | |
27689 | + int do_plink, struct au_wh_base base[], | |
27690 | + struct path *h_path) | |
27691 | +{ | |
27692 | + int err; | |
27693 | + struct inode *h_dir; | |
27694 | + | |
27695 | + h_dir = h_root->d_inode; | |
27696 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
27697 | + au_wh_clean(h_dir, h_path, /*isdir*/0); | |
27698 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
27699 | + if (do_plink) { | |
27700 | + err = test_linkable(h_root); | |
27701 | + if (unlikely(err)) { | |
27702 | + err = 1; | |
27703 | + goto out; | |
27704 | + } | |
27705 | + | |
27706 | + err = au_whdir(h_dir, h_path); | |
27707 | + if (unlikely(err)) | |
27708 | + goto out; | |
27709 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
27710 | + } else | |
27711 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
27712 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
27713 | + err = au_whdir(h_dir, h_path); | |
27714 | + if (unlikely(err)) | |
27715 | + goto out; | |
27716 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
27717 | + | |
4f0767ce | 27718 | +out: |
1facf9fc | 27719 | + return err; |
27720 | +} | |
27721 | + | |
27722 | +/* | |
27723 | + * for the moment, aufs supports the branch filesystem which does not support | |
27724 | + * link(2). testing on FAT which does not support i_op->setattr() fully either, | |
27725 | + * copyup failed. finally, such filesystem will not be used as the writable | |
27726 | + * branch. | |
27727 | + * | |
27728 | + * returns tri-state, see above. | |
27729 | + */ | |
27730 | +static int au_wh_init_rw(struct dentry *h_root, struct au_wbr *wbr, | |
27731 | + int do_plink, struct au_wh_base base[], | |
27732 | + struct path *h_path) | |
27733 | +{ | |
27734 | + int err; | |
27735 | + struct inode *h_dir; | |
27736 | + | |
1308ab2a | 27737 | + WbrWhMustWriteLock(wbr); |
27738 | + | |
1facf9fc | 27739 | + err = test_linkable(h_root); |
27740 | + if (unlikely(err)) { | |
27741 | + err = 1; | |
27742 | + goto out; | |
27743 | + } | |
27744 | + | |
27745 | + /* | |
27746 | + * todo: should this create be done in /sbin/mount.aufs helper? | |
27747 | + */ | |
27748 | + err = -EEXIST; | |
27749 | + h_dir = h_root->d_inode; | |
27750 | + if (!base[AuBrWh_BASE].dentry->d_inode) { | |
27751 | + err = mnt_want_write(h_path->mnt); | |
27752 | + if (!err) { | |
27753 | + h_path->dentry = base[AuBrWh_BASE].dentry; | |
27754 | + err = vfsub_create(h_dir, h_path, WH_MASK); | |
27755 | + mnt_drop_write(h_path->mnt); | |
27756 | + } | |
27757 | + } else if (S_ISREG(base[AuBrWh_BASE].dentry->d_inode->i_mode)) | |
27758 | + err = 0; | |
27759 | + else | |
4a4d8108 AM |
27760 | + pr_err("unknown %.*s/%.*s exists\n", |
27761 | + AuDLNPair(h_root), AuDLNPair(base[AuBrWh_BASE].dentry)); | |
1facf9fc | 27762 | + if (unlikely(err)) |
27763 | + goto out; | |
27764 | + | |
27765 | + h_path->dentry = base[AuBrWh_PLINK].dentry; | |
27766 | + if (do_plink) { | |
27767 | + err = au_whdir(h_dir, h_path); | |
27768 | + if (unlikely(err)) | |
27769 | + goto out; | |
27770 | + wbr->wbr_plink = dget(base[AuBrWh_PLINK].dentry); | |
27771 | + } else | |
27772 | + au_wh_clean(h_dir, h_path, /*isdir*/1); | |
27773 | + wbr->wbr_whbase = dget(base[AuBrWh_BASE].dentry); | |
27774 | + | |
27775 | + h_path->dentry = base[AuBrWh_ORPH].dentry; | |
27776 | + err = au_whdir(h_dir, h_path); | |
27777 | + if (unlikely(err)) | |
27778 | + goto out; | |
27779 | + wbr->wbr_orph = dget(base[AuBrWh_ORPH].dentry); | |
27780 | + | |
4f0767ce | 27781 | +out: |
1facf9fc | 27782 | + return err; |
27783 | +} | |
27784 | + | |
27785 | +/* | |
27786 | + * initialize the whiteout base file/dir for @br. | |
27787 | + */ | |
27788 | +int au_wh_init(struct dentry *h_root, struct au_branch *br, | |
27789 | + struct super_block *sb) | |
27790 | +{ | |
27791 | + int err, i; | |
27792 | + const unsigned char do_plink | |
27793 | + = !!au_opt_test(au_mntflags(sb), PLINK); | |
27794 | + struct path path = { | |
27795 | + .mnt = br->br_mnt | |
27796 | + }; | |
27797 | + struct inode *h_dir; | |
27798 | + struct au_wbr *wbr = br->br_wbr; | |
27799 | + static const struct qstr base_name[] = { | |
27800 | + [AuBrWh_BASE] = { | |
27801 | + .name = AUFS_BASE_NAME, | |
27802 | + .len = sizeof(AUFS_BASE_NAME) - 1 | |
27803 | + }, | |
27804 | + [AuBrWh_PLINK] = { | |
27805 | + .name = AUFS_PLINKDIR_NAME, | |
27806 | + .len = sizeof(AUFS_PLINKDIR_NAME) - 1 | |
27807 | + }, | |
27808 | + [AuBrWh_ORPH] = { | |
27809 | + .name = AUFS_ORPHDIR_NAME, | |
27810 | + .len = sizeof(AUFS_ORPHDIR_NAME) - 1 | |
27811 | + } | |
27812 | + }; | |
27813 | + struct au_wh_base base[] = { | |
27814 | + [AuBrWh_BASE] = { | |
27815 | + .name = base_name + AuBrWh_BASE, | |
27816 | + .dentry = NULL | |
27817 | + }, | |
27818 | + [AuBrWh_PLINK] = { | |
27819 | + .name = base_name + AuBrWh_PLINK, | |
27820 | + .dentry = NULL | |
27821 | + }, | |
27822 | + [AuBrWh_ORPH] = { | |
27823 | + .name = base_name + AuBrWh_ORPH, | |
27824 | + .dentry = NULL | |
27825 | + } | |
27826 | + }; | |
27827 | + | |
1308ab2a | 27828 | + if (wbr) |
27829 | + WbrWhMustWriteLock(wbr); | |
1facf9fc | 27830 | + |
1facf9fc | 27831 | + for (i = 0; i < AuBrWh_Last; i++) { |
27832 | + /* doubly whiteouted */ | |
27833 | + struct dentry *d; | |
27834 | + | |
27835 | + d = au_wh_lkup(h_root, (void *)base[i].name, br); | |
27836 | + err = PTR_ERR(d); | |
27837 | + if (IS_ERR(d)) | |
27838 | + goto out; | |
27839 | + | |
27840 | + base[i].dentry = d; | |
27841 | + AuDebugOn(wbr | |
27842 | + && wbr->wbr_wh[i] | |
27843 | + && wbr->wbr_wh[i] != base[i].dentry); | |
27844 | + } | |
27845 | + | |
27846 | + if (wbr) | |
27847 | + for (i = 0; i < AuBrWh_Last; i++) { | |
27848 | + dput(wbr->wbr_wh[i]); | |
27849 | + wbr->wbr_wh[i] = NULL; | |
27850 | + } | |
27851 | + | |
27852 | + err = 0; | |
1facf9fc | 27853 | + switch (br->br_perm) { |
27854 | + case AuBrPerm_RO: | |
27855 | + case AuBrPerm_ROWH: | |
27856 | + case AuBrPerm_RR: | |
27857 | + case AuBrPerm_RRWH: | |
4a4d8108 | 27858 | + h_dir = h_root->d_inode; |
1facf9fc | 27859 | + au_wh_init_ro(h_dir, base, &path); |
27860 | + break; | |
27861 | + | |
27862 | + case AuBrPerm_RWNoLinkWH: | |
27863 | + err = au_wh_init_rw_nolink(h_root, wbr, do_plink, base, &path); | |
27864 | + if (err > 0) | |
27865 | + goto out; | |
27866 | + else if (err) | |
27867 | + goto out_err; | |
27868 | + break; | |
27869 | + | |
27870 | + case AuBrPerm_RW: | |
27871 | + err = au_wh_init_rw(h_root, wbr, do_plink, base, &path); | |
27872 | + if (err > 0) | |
27873 | + goto out; | |
27874 | + else if (err) | |
27875 | + goto out_err; | |
27876 | + break; | |
27877 | + | |
27878 | + default: | |
27879 | + BUG(); | |
27880 | + } | |
27881 | + goto out; /* success */ | |
27882 | + | |
4f0767ce | 27883 | +out_err: |
4a4d8108 AM |
27884 | + pr_err("an error(%d) on the writable branch %.*s(%s)\n", |
27885 | + err, AuDLNPair(h_root), au_sbtype(h_root->d_sb)); | |
4f0767ce | 27886 | +out: |
1facf9fc | 27887 | + for (i = 0; i < AuBrWh_Last; i++) |
27888 | + dput(base[i].dentry); | |
27889 | + return err; | |
27890 | +} | |
27891 | + | |
27892 | +/* ---------------------------------------------------------------------- */ | |
27893 | +/* | |
27894 | + * whiteouts are all hard-linked usually. | |
27895 | + * when its link count reaches a ceiling, we create a new whiteout base | |
27896 | + * asynchronously. | |
27897 | + */ | |
27898 | + | |
27899 | +struct reinit_br_wh { | |
27900 | + struct super_block *sb; | |
27901 | + struct au_branch *br; | |
27902 | +}; | |
27903 | + | |
27904 | +static void reinit_br_wh(void *arg) | |
27905 | +{ | |
27906 | + int err; | |
27907 | + aufs_bindex_t bindex; | |
27908 | + struct path h_path; | |
27909 | + struct reinit_br_wh *a = arg; | |
27910 | + struct au_wbr *wbr; | |
27911 | + struct inode *dir; | |
27912 | + struct dentry *h_root; | |
27913 | + struct au_hinode *hdir; | |
27914 | + | |
27915 | + err = 0; | |
27916 | + wbr = a->br->br_wbr; | |
27917 | + /* big aufs lock */ | |
27918 | + si_noflush_write_lock(a->sb); | |
27919 | + if (!au_br_writable(a->br->br_perm)) | |
27920 | + goto out; | |
27921 | + bindex = au_br_index(a->sb, a->br->br_id); | |
27922 | + if (unlikely(bindex < 0)) | |
27923 | + goto out; | |
27924 | + | |
1308ab2a | 27925 | + di_read_lock_parent(a->sb->s_root, AuLock_IR); |
1facf9fc | 27926 | + dir = a->sb->s_root->d_inode; |
1facf9fc | 27927 | + hdir = au_hi(dir, bindex); |
27928 | + h_root = au_h_dptr(a->sb->s_root, bindex); | |
27929 | + | |
4a4d8108 | 27930 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
1facf9fc | 27931 | + wbr_wh_write_lock(wbr); |
27932 | + err = au_h_verify(wbr->wbr_whbase, au_opt_udba(a->sb), hdir->hi_inode, | |
27933 | + h_root, a->br); | |
27934 | + if (!err) { | |
27935 | + err = mnt_want_write(a->br->br_mnt); | |
27936 | + if (!err) { | |
27937 | + h_path.dentry = wbr->wbr_whbase; | |
27938 | + h_path.mnt = a->br->br_mnt; | |
27939 | + err = vfsub_unlink(hdir->hi_inode, &h_path, /*force*/0); | |
27940 | + mnt_drop_write(a->br->br_mnt); | |
27941 | + } | |
27942 | + } else { | |
4a4d8108 AM |
27943 | + pr_warning("%.*s is moved, ignored\n", |
27944 | + AuDLNPair(wbr->wbr_whbase)); | |
1facf9fc | 27945 | + err = 0; |
27946 | + } | |
27947 | + dput(wbr->wbr_whbase); | |
27948 | + wbr->wbr_whbase = NULL; | |
27949 | + if (!err) | |
27950 | + err = au_wh_init(h_root, a->br, a->sb); | |
27951 | + wbr_wh_write_unlock(wbr); | |
4a4d8108 | 27952 | + au_hn_imtx_unlock(hdir); |
1308ab2a | 27953 | + di_read_unlock(a->sb->s_root, AuLock_IR); |
1facf9fc | 27954 | + |
4f0767ce | 27955 | +out: |
1facf9fc | 27956 | + if (wbr) |
27957 | + atomic_dec(&wbr->wbr_wh_running); | |
27958 | + atomic_dec(&a->br->br_count); | |
1facf9fc | 27959 | + si_write_unlock(a->sb); |
027c5e7a | 27960 | + au_nwt_done(&au_sbi(a->sb)->si_nowait); |
1facf9fc | 27961 | + kfree(arg); |
27962 | + if (unlikely(err)) | |
27963 | + AuIOErr("err %d\n", err); | |
27964 | +} | |
27965 | + | |
27966 | +static void kick_reinit_br_wh(struct super_block *sb, struct au_branch *br) | |
27967 | +{ | |
27968 | + int do_dec, wkq_err; | |
27969 | + struct reinit_br_wh *arg; | |
27970 | + | |
27971 | + do_dec = 1; | |
27972 | + if (atomic_inc_return(&br->br_wbr->wbr_wh_running) != 1) | |
27973 | + goto out; | |
27974 | + | |
27975 | + /* ignore ENOMEM */ | |
27976 | + arg = kmalloc(sizeof(*arg), GFP_NOFS); | |
27977 | + if (arg) { | |
27978 | + /* | |
27979 | + * dec(wh_running), kfree(arg) and dec(br_count) | |
27980 | + * in reinit function | |
27981 | + */ | |
27982 | + arg->sb = sb; | |
27983 | + arg->br = br; | |
27984 | + atomic_inc(&br->br_count); | |
53392da6 | 27985 | + wkq_err = au_wkq_nowait(reinit_br_wh, arg, sb, /*flags*/0); |
1facf9fc | 27986 | + if (unlikely(wkq_err)) { |
27987 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
27988 | + atomic_dec(&br->br_count); | |
27989 | + kfree(arg); | |
27990 | + } | |
27991 | + do_dec = 0; | |
27992 | + } | |
27993 | + | |
4f0767ce | 27994 | +out: |
1facf9fc | 27995 | + if (do_dec) |
27996 | + atomic_dec(&br->br_wbr->wbr_wh_running); | |
27997 | +} | |
27998 | + | |
27999 | +/* ---------------------------------------------------------------------- */ | |
28000 | + | |
28001 | +/* | |
28002 | + * create the whiteout @wh. | |
28003 | + */ | |
28004 | +static int link_or_create_wh(struct super_block *sb, aufs_bindex_t bindex, | |
28005 | + struct dentry *wh) | |
28006 | +{ | |
28007 | + int err; | |
28008 | + struct path h_path = { | |
28009 | + .dentry = wh | |
28010 | + }; | |
28011 | + struct au_branch *br; | |
28012 | + struct au_wbr *wbr; | |
28013 | + struct dentry *h_parent; | |
28014 | + struct inode *h_dir; | |
28015 | + | |
28016 | + h_parent = wh->d_parent; /* dir inode is locked */ | |
28017 | + h_dir = h_parent->d_inode; | |
28018 | + IMustLock(h_dir); | |
28019 | + | |
28020 | + br = au_sbr(sb, bindex); | |
28021 | + h_path.mnt = br->br_mnt; | |
28022 | + wbr = br->br_wbr; | |
28023 | + wbr_wh_read_lock(wbr); | |
28024 | + if (wbr->wbr_whbase) { | |
28025 | + err = vfsub_link(wbr->wbr_whbase, h_dir, &h_path); | |
28026 | + if (!err || err != -EMLINK) | |
28027 | + goto out; | |
28028 | + | |
28029 | + /* link count full. re-initialize br_whbase. */ | |
28030 | + kick_reinit_br_wh(sb, br); | |
28031 | + } | |
28032 | + | |
28033 | + /* return this error in this context */ | |
28034 | + err = vfsub_create(h_dir, &h_path, WH_MASK); | |
28035 | + | |
4f0767ce | 28036 | +out: |
1facf9fc | 28037 | + wbr_wh_read_unlock(wbr); |
28038 | + return err; | |
28039 | +} | |
28040 | + | |
28041 | +/* ---------------------------------------------------------------------- */ | |
28042 | + | |
28043 | +/* | |
28044 | + * create or remove the diropq. | |
28045 | + */ | |
28046 | +static struct dentry *do_diropq(struct dentry *dentry, aufs_bindex_t bindex, | |
28047 | + unsigned int flags) | |
28048 | +{ | |
28049 | + struct dentry *opq_dentry, *h_dentry; | |
28050 | + struct super_block *sb; | |
28051 | + struct au_branch *br; | |
28052 | + int err; | |
28053 | + | |
28054 | + sb = dentry->d_sb; | |
28055 | + br = au_sbr(sb, bindex); | |
28056 | + h_dentry = au_h_dptr(dentry, bindex); | |
28057 | + opq_dentry = au_lkup_one(&diropq_name, h_dentry, br, /*nd*/NULL); | |
28058 | + if (IS_ERR(opq_dentry)) | |
28059 | + goto out; | |
28060 | + | |
28061 | + if (au_ftest_diropq(flags, CREATE)) { | |
28062 | + err = link_or_create_wh(sb, bindex, opq_dentry); | |
28063 | + if (!err) { | |
28064 | + au_set_dbdiropq(dentry, bindex); | |
28065 | + goto out; /* success */ | |
28066 | + } | |
28067 | + } else { | |
28068 | + struct path tmp = { | |
28069 | + .dentry = opq_dentry, | |
28070 | + .mnt = br->br_mnt | |
28071 | + }; | |
28072 | + err = do_unlink_wh(au_h_iptr(dentry->d_inode, bindex), &tmp); | |
28073 | + if (!err) | |
28074 | + au_set_dbdiropq(dentry, -1); | |
28075 | + } | |
28076 | + dput(opq_dentry); | |
28077 | + opq_dentry = ERR_PTR(err); | |
28078 | + | |
4f0767ce | 28079 | +out: |
1facf9fc | 28080 | + return opq_dentry; |
28081 | +} | |
28082 | + | |
28083 | +struct do_diropq_args { | |
28084 | + struct dentry **errp; | |
28085 | + struct dentry *dentry; | |
28086 | + aufs_bindex_t bindex; | |
28087 | + unsigned int flags; | |
28088 | +}; | |
28089 | + | |
28090 | +static void call_do_diropq(void *args) | |
28091 | +{ | |
28092 | + struct do_diropq_args *a = args; | |
28093 | + *a->errp = do_diropq(a->dentry, a->bindex, a->flags); | |
28094 | +} | |
28095 | + | |
28096 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
28097 | + unsigned int flags) | |
28098 | +{ | |
28099 | + struct dentry *diropq, *h_dentry; | |
28100 | + | |
28101 | + h_dentry = au_h_dptr(dentry, bindex); | |
28102 | + if (!au_test_h_perm_sio(h_dentry->d_inode, MAY_EXEC | MAY_WRITE)) | |
28103 | + diropq = do_diropq(dentry, bindex, flags); | |
28104 | + else { | |
28105 | + int wkq_err; | |
28106 | + struct do_diropq_args args = { | |
28107 | + .errp = &diropq, | |
28108 | + .dentry = dentry, | |
28109 | + .bindex = bindex, | |
28110 | + .flags = flags | |
28111 | + }; | |
28112 | + | |
28113 | + wkq_err = au_wkq_wait(call_do_diropq, &args); | |
28114 | + if (unlikely(wkq_err)) | |
28115 | + diropq = ERR_PTR(wkq_err); | |
28116 | + } | |
28117 | + | |
28118 | + return diropq; | |
28119 | +} | |
28120 | + | |
28121 | +/* ---------------------------------------------------------------------- */ | |
28122 | + | |
28123 | +/* | |
28124 | + * lookup whiteout dentry. | |
28125 | + * @h_parent: lower parent dentry which must exist and be locked | |
28126 | + * @base_name: name of dentry which will be whiteouted | |
28127 | + * returns dentry for whiteout. | |
28128 | + */ | |
28129 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
28130 | + struct au_branch *br) | |
28131 | +{ | |
28132 | + int err; | |
28133 | + struct qstr wh_name; | |
28134 | + struct dentry *wh_dentry; | |
28135 | + | |
28136 | + err = au_wh_name_alloc(&wh_name, base_name); | |
28137 | + wh_dentry = ERR_PTR(err); | |
28138 | + if (!err) { | |
28139 | + wh_dentry = au_lkup_one(&wh_name, h_parent, br, /*nd*/NULL); | |
28140 | + kfree(wh_name.name); | |
28141 | + } | |
28142 | + return wh_dentry; | |
28143 | +} | |
28144 | + | |
28145 | +/* | |
28146 | + * link/create a whiteout for @dentry on @bindex. | |
28147 | + */ | |
28148 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
28149 | + struct dentry *h_parent) | |
28150 | +{ | |
28151 | + struct dentry *wh_dentry; | |
28152 | + struct super_block *sb; | |
28153 | + int err; | |
28154 | + | |
28155 | + sb = dentry->d_sb; | |
28156 | + wh_dentry = au_wh_lkup(h_parent, &dentry->d_name, au_sbr(sb, bindex)); | |
28157 | + if (!IS_ERR(wh_dentry) && !wh_dentry->d_inode) { | |
28158 | + err = link_or_create_wh(sb, bindex, wh_dentry); | |
28159 | + if (!err) | |
28160 | + au_set_dbwh(dentry, bindex); | |
28161 | + else { | |
28162 | + dput(wh_dentry); | |
28163 | + wh_dentry = ERR_PTR(err); | |
28164 | + } | |
28165 | + } | |
28166 | + | |
28167 | + return wh_dentry; | |
28168 | +} | |
28169 | + | |
28170 | +/* ---------------------------------------------------------------------- */ | |
28171 | + | |
28172 | +/* Delete all whiteouts in this directory on branch bindex. */ | |
28173 | +static int del_wh_children(struct dentry *h_dentry, struct au_nhash *whlist, | |
28174 | + aufs_bindex_t bindex, struct au_branch *br) | |
28175 | +{ | |
28176 | + int err; | |
28177 | + unsigned long ul, n; | |
28178 | + struct qstr wh_name; | |
28179 | + char *p; | |
28180 | + struct hlist_head *head; | |
28181 | + struct au_vdir_wh *tpos; | |
28182 | + struct hlist_node *pos; | |
28183 | + struct au_vdir_destr *str; | |
28184 | + | |
28185 | + err = -ENOMEM; | |
4a4d8108 | 28186 | + p = __getname_gfp(GFP_NOFS); |
1facf9fc | 28187 | + wh_name.name = p; |
28188 | + if (unlikely(!wh_name.name)) | |
28189 | + goto out; | |
28190 | + | |
28191 | + err = 0; | |
28192 | + memcpy(p, AUFS_WH_PFX, AUFS_WH_PFX_LEN); | |
28193 | + p += AUFS_WH_PFX_LEN; | |
28194 | + n = whlist->nh_num; | |
28195 | + head = whlist->nh_head; | |
28196 | + for (ul = 0; !err && ul < n; ul++, head++) { | |
28197 | + hlist_for_each_entry(tpos, pos, head, wh_hash) { | |
28198 | + if (tpos->wh_bindex != bindex) | |
28199 | + continue; | |
28200 | + | |
28201 | + str = &tpos->wh_str; | |
28202 | + if (str->len + AUFS_WH_PFX_LEN <= PATH_MAX) { | |
28203 | + memcpy(p, str->name, str->len); | |
28204 | + wh_name.len = AUFS_WH_PFX_LEN + str->len; | |
28205 | + err = unlink_wh_name(h_dentry, &wh_name, br); | |
28206 | + if (!err) | |
28207 | + continue; | |
28208 | + break; | |
28209 | + } | |
28210 | + AuIOErr("whiteout name too long %.*s\n", | |
28211 | + str->len, str->name); | |
28212 | + err = -EIO; | |
28213 | + break; | |
28214 | + } | |
28215 | + } | |
28216 | + __putname(wh_name.name); | |
28217 | + | |
4f0767ce | 28218 | +out: |
1facf9fc | 28219 | + return err; |
28220 | +} | |
28221 | + | |
28222 | +struct del_wh_children_args { | |
28223 | + int *errp; | |
28224 | + struct dentry *h_dentry; | |
1308ab2a | 28225 | + struct au_nhash *whlist; |
1facf9fc | 28226 | + aufs_bindex_t bindex; |
28227 | + struct au_branch *br; | |
28228 | +}; | |
28229 | + | |
28230 | +static void call_del_wh_children(void *args) | |
28231 | +{ | |
28232 | + struct del_wh_children_args *a = args; | |
1308ab2a | 28233 | + *a->errp = del_wh_children(a->h_dentry, a->whlist, a->bindex, a->br); |
1facf9fc | 28234 | +} |
28235 | + | |
28236 | +/* ---------------------------------------------------------------------- */ | |
28237 | + | |
28238 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp) | |
28239 | +{ | |
28240 | + struct au_whtmp_rmdir *whtmp; | |
dece6358 | 28241 | + int err; |
1308ab2a | 28242 | + unsigned int rdhash; |
dece6358 AM |
28243 | + |
28244 | + SiMustAnyLock(sb); | |
1facf9fc | 28245 | + |
28246 | + whtmp = kmalloc(sizeof(*whtmp), gfp); | |
dece6358 AM |
28247 | + if (unlikely(!whtmp)) { |
28248 | + whtmp = ERR_PTR(-ENOMEM); | |
1facf9fc | 28249 | + goto out; |
dece6358 | 28250 | + } |
1facf9fc | 28251 | + |
28252 | + whtmp->dir = NULL; | |
027c5e7a | 28253 | + whtmp->br = NULL; |
1facf9fc | 28254 | + whtmp->wh_dentry = NULL; |
1308ab2a | 28255 | + /* no estimation for dir size */ |
28256 | + rdhash = au_sbi(sb)->si_rdhash; | |
28257 | + if (!rdhash) | |
28258 | + rdhash = AUFS_RDHASH_DEF; | |
28259 | + err = au_nhash_alloc(&whtmp->whlist, rdhash, gfp); | |
28260 | + if (unlikely(err)) { | |
28261 | + kfree(whtmp); | |
28262 | + whtmp = ERR_PTR(err); | |
28263 | + } | |
dece6358 | 28264 | + |
4f0767ce | 28265 | +out: |
dece6358 | 28266 | + return whtmp; |
1facf9fc | 28267 | +} |
28268 | + | |
28269 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp) | |
28270 | +{ | |
027c5e7a AM |
28271 | + if (whtmp->br) |
28272 | + atomic_dec(&whtmp->br->br_count); | |
1facf9fc | 28273 | + dput(whtmp->wh_dentry); |
28274 | + iput(whtmp->dir); | |
dece6358 | 28275 | + au_nhash_wh_free(&whtmp->whlist); |
1facf9fc | 28276 | + kfree(whtmp); |
28277 | +} | |
28278 | + | |
28279 | +/* | |
28280 | + * rmdir the whiteouted temporary named dir @h_dentry. | |
28281 | + * @whlist: whiteouted children. | |
28282 | + */ | |
28283 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
28284 | + struct dentry *wh_dentry, struct au_nhash *whlist) | |
28285 | +{ | |
28286 | + int err; | |
28287 | + struct path h_tmp; | |
28288 | + struct inode *wh_inode, *h_dir; | |
28289 | + struct au_branch *br; | |
28290 | + | |
28291 | + h_dir = wh_dentry->d_parent->d_inode; /* dir inode is locked */ | |
28292 | + IMustLock(h_dir); | |
28293 | + | |
28294 | + br = au_sbr(dir->i_sb, bindex); | |
28295 | + wh_inode = wh_dentry->d_inode; | |
28296 | + mutex_lock_nested(&wh_inode->i_mutex, AuLsc_I_CHILD); | |
28297 | + | |
28298 | + /* | |
28299 | + * someone else might change some whiteouts while we were sleeping. | |
28300 | + * it means this whlist may have an obsoleted entry. | |
28301 | + */ | |
28302 | + if (!au_test_h_perm_sio(wh_inode, MAY_EXEC | MAY_WRITE)) | |
28303 | + err = del_wh_children(wh_dentry, whlist, bindex, br); | |
28304 | + else { | |
28305 | + int wkq_err; | |
28306 | + struct del_wh_children_args args = { | |
28307 | + .errp = &err, | |
28308 | + .h_dentry = wh_dentry, | |
1308ab2a | 28309 | + .whlist = whlist, |
1facf9fc | 28310 | + .bindex = bindex, |
28311 | + .br = br | |
28312 | + }; | |
28313 | + | |
28314 | + wkq_err = au_wkq_wait(call_del_wh_children, &args); | |
28315 | + if (unlikely(wkq_err)) | |
28316 | + err = wkq_err; | |
28317 | + } | |
28318 | + mutex_unlock(&wh_inode->i_mutex); | |
28319 | + | |
28320 | + if (!err) { | |
28321 | + h_tmp.dentry = wh_dentry; | |
28322 | + h_tmp.mnt = br->br_mnt; | |
28323 | + err = vfsub_rmdir(h_dir, &h_tmp); | |
1facf9fc | 28324 | + } |
28325 | + | |
28326 | + if (!err) { | |
28327 | + if (au_ibstart(dir) == bindex) { | |
7f207e10 | 28328 | + /* todo: dir->i_mutex is necessary */ |
1facf9fc | 28329 | + au_cpup_attr_timesizes(dir); |
7f207e10 | 28330 | + vfsub_drop_nlink(dir); |
1facf9fc | 28331 | + } |
28332 | + return 0; /* success */ | |
28333 | + } | |
28334 | + | |
4a4d8108 AM |
28335 | + pr_warning("failed removing %.*s(%d), ignored\n", |
28336 | + AuDLNPair(wh_dentry), err); | |
1facf9fc | 28337 | + return err; |
28338 | +} | |
28339 | + | |
28340 | +static void call_rmdir_whtmp(void *args) | |
28341 | +{ | |
28342 | + int err; | |
e49829fe | 28343 | + aufs_bindex_t bindex; |
1facf9fc | 28344 | + struct au_whtmp_rmdir *a = args; |
28345 | + struct super_block *sb; | |
28346 | + struct dentry *h_parent; | |
28347 | + struct inode *h_dir; | |
1facf9fc | 28348 | + struct au_hinode *hdir; |
28349 | + | |
28350 | + /* rmdir by nfsd may cause deadlock with this i_mutex */ | |
28351 | + /* mutex_lock(&a->dir->i_mutex); */ | |
e49829fe | 28352 | + err = -EROFS; |
1facf9fc | 28353 | + sb = a->dir->i_sb; |
e49829fe JR |
28354 | + si_read_lock(sb, !AuLock_FLUSH); |
28355 | + if (!au_br_writable(a->br->br_perm)) | |
28356 | + goto out; | |
28357 | + bindex = au_br_index(sb, a->br->br_id); | |
28358 | + if (unlikely(bindex < 0)) | |
1facf9fc | 28359 | + goto out; |
28360 | + | |
28361 | + err = -EIO; | |
1facf9fc | 28362 | + ii_write_lock_parent(a->dir); |
28363 | + h_parent = dget_parent(a->wh_dentry); | |
28364 | + h_dir = h_parent->d_inode; | |
e49829fe | 28365 | + hdir = au_hi(a->dir, bindex); |
4a4d8108 | 28366 | + au_hn_imtx_lock_nested(hdir, AuLsc_I_PARENT); |
e49829fe JR |
28367 | + err = au_h_verify(a->wh_dentry, au_opt_udba(sb), h_dir, h_parent, |
28368 | + a->br); | |
1facf9fc | 28369 | + if (!err) { |
e49829fe | 28370 | + err = mnt_want_write(a->br->br_mnt); |
1facf9fc | 28371 | + if (!err) { |
e49829fe | 28372 | + err = au_whtmp_rmdir(a->dir, bindex, a->wh_dentry, |
dece6358 | 28373 | + &a->whlist); |
e49829fe | 28374 | + mnt_drop_write(a->br->br_mnt); |
1facf9fc | 28375 | + } |
28376 | + } | |
4a4d8108 | 28377 | + au_hn_imtx_unlock(hdir); |
1facf9fc | 28378 | + dput(h_parent); |
28379 | + ii_write_unlock(a->dir); | |
28380 | + | |
4f0767ce | 28381 | +out: |
1facf9fc | 28382 | + /* mutex_unlock(&a->dir->i_mutex); */ |
1facf9fc | 28383 | + au_whtmp_rmdir_free(a); |
027c5e7a AM |
28384 | + si_read_unlock(sb); |
28385 | + au_nwt_done(&au_sbi(sb)->si_nowait); | |
1facf9fc | 28386 | + if (unlikely(err)) |
28387 | + AuIOErr("err %d\n", err); | |
28388 | +} | |
28389 | + | |
28390 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
28391 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args) | |
28392 | +{ | |
28393 | + int wkq_err; | |
e49829fe | 28394 | + struct super_block *sb; |
1facf9fc | 28395 | + |
28396 | + IMustLock(dir); | |
28397 | + | |
28398 | + /* all post-process will be done in do_rmdir_whtmp(). */ | |
e49829fe | 28399 | + sb = dir->i_sb; |
1facf9fc | 28400 | + args->dir = au_igrab(dir); |
e49829fe JR |
28401 | + args->br = au_sbr(sb, bindex); |
28402 | + atomic_inc(&args->br->br_count); | |
1facf9fc | 28403 | + args->wh_dentry = dget(wh_dentry); |
53392da6 | 28404 | + wkq_err = au_wkq_nowait(call_rmdir_whtmp, args, sb, /*flags*/0); |
1facf9fc | 28405 | + if (unlikely(wkq_err)) { |
4a4d8108 AM |
28406 | + pr_warning("rmdir error %.*s (%d), ignored\n", |
28407 | + AuDLNPair(wh_dentry), wkq_err); | |
1facf9fc | 28408 | + au_whtmp_rmdir_free(args); |
28409 | + } | |
28410 | +} | |
7f207e10 AM |
28411 | diff -urN /usr/share/empty/fs/aufs/whout.h linux/fs/aufs/whout.h |
28412 | --- /usr/share/empty/fs/aufs/whout.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 28413 | +++ linux/fs/aufs/whout.h 2011-08-24 13:30:24.734646739 +0200 |
7f207e10 | 28414 | @@ -0,0 +1,89 @@ |
1facf9fc | 28415 | +/* |
027c5e7a | 28416 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 28417 | + * |
28418 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28419 | + * it under the terms of the GNU General Public License as published by | |
28420 | + * the Free Software Foundation; either version 2 of the License, or | |
28421 | + * (at your option) any later version. | |
dece6358 AM |
28422 | + * |
28423 | + * This program is distributed in the hope that it will be useful, | |
28424 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28425 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28426 | + * GNU General Public License for more details. | |
28427 | + * | |
28428 | + * You should have received a copy of the GNU General Public License | |
28429 | + * along with this program; if not, write to the Free Software | |
28430 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 28431 | + */ |
28432 | + | |
28433 | +/* | |
28434 | + * whiteout for logical deletion and opaque directory | |
28435 | + */ | |
28436 | + | |
28437 | +#ifndef __AUFS_WHOUT_H__ | |
28438 | +#define __AUFS_WHOUT_H__ | |
28439 | + | |
28440 | +#ifdef __KERNEL__ | |
28441 | + | |
1facf9fc | 28442 | +#include <linux/aufs_type.h> |
28443 | +#include "dir.h" | |
28444 | + | |
28445 | +/* whout.c */ | |
28446 | +int au_wh_name_alloc(struct qstr *wh, const struct qstr *name); | |
28447 | +struct au_branch; | |
28448 | +int au_wh_test(struct dentry *h_parent, struct qstr *wh_name, | |
28449 | + struct au_branch *br, int try_sio); | |
28450 | +int au_diropq_test(struct dentry *h_dentry, struct au_branch *br); | |
28451 | +struct dentry *au_whtmp_lkup(struct dentry *h_parent, struct au_branch *br, | |
28452 | + struct qstr *prefix); | |
28453 | +int au_whtmp_ren(struct dentry *h_dentry, struct au_branch *br); | |
28454 | +int au_wh_unlink_dentry(struct inode *h_dir, struct path *h_path, | |
28455 | + struct dentry *dentry); | |
28456 | +int au_wh_init(struct dentry *h_parent, struct au_branch *br, | |
28457 | + struct super_block *sb); | |
28458 | + | |
28459 | +/* diropq flags */ | |
28460 | +#define AuDiropq_CREATE 1 | |
28461 | +#define au_ftest_diropq(flags, name) ((flags) & AuDiropq_##name) | |
7f207e10 AM |
28462 | +#define au_fset_diropq(flags, name) \ |
28463 | + do { (flags) |= AuDiropq_##name; } while (0) | |
28464 | +#define au_fclr_diropq(flags, name) \ | |
28465 | + do { (flags) &= ~AuDiropq_##name; } while (0) | |
1facf9fc | 28466 | + |
28467 | +struct dentry *au_diropq_sio(struct dentry *dentry, aufs_bindex_t bindex, | |
28468 | + unsigned int flags); | |
28469 | +struct dentry *au_wh_lkup(struct dentry *h_parent, struct qstr *base_name, | |
28470 | + struct au_branch *br); | |
28471 | +struct dentry *au_wh_create(struct dentry *dentry, aufs_bindex_t bindex, | |
28472 | + struct dentry *h_parent); | |
28473 | + | |
28474 | +/* real rmdir for the whiteout-ed dir */ | |
28475 | +struct au_whtmp_rmdir { | |
28476 | + struct inode *dir; | |
e49829fe | 28477 | + struct au_branch *br; |
1facf9fc | 28478 | + struct dentry *wh_dentry; |
dece6358 | 28479 | + struct au_nhash whlist; |
1facf9fc | 28480 | +}; |
28481 | + | |
28482 | +struct au_whtmp_rmdir *au_whtmp_rmdir_alloc(struct super_block *sb, gfp_t gfp); | |
28483 | +void au_whtmp_rmdir_free(struct au_whtmp_rmdir *whtmp); | |
28484 | +int au_whtmp_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
28485 | + struct dentry *wh_dentry, struct au_nhash *whlist); | |
28486 | +void au_whtmp_kick_rmdir(struct inode *dir, aufs_bindex_t bindex, | |
28487 | + struct dentry *wh_dentry, struct au_whtmp_rmdir *args); | |
28488 | + | |
28489 | +/* ---------------------------------------------------------------------- */ | |
28490 | + | |
28491 | +static inline struct dentry *au_diropq_create(struct dentry *dentry, | |
28492 | + aufs_bindex_t bindex) | |
28493 | +{ | |
28494 | + return au_diropq_sio(dentry, bindex, AuDiropq_CREATE); | |
28495 | +} | |
28496 | + | |
28497 | +static inline int au_diropq_remove(struct dentry *dentry, aufs_bindex_t bindex) | |
28498 | +{ | |
28499 | + return PTR_ERR(au_diropq_sio(dentry, bindex, !AuDiropq_CREATE)); | |
28500 | +} | |
28501 | + | |
28502 | +#endif /* __KERNEL__ */ | |
28503 | +#endif /* __AUFS_WHOUT_H__ */ | |
7f207e10 AM |
28504 | diff -urN /usr/share/empty/fs/aufs/wkq.c linux/fs/aufs/wkq.c |
28505 | --- /usr/share/empty/fs/aufs/wkq.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
28506 | +++ linux/fs/aufs/wkq.c 2011-08-24 13:30:24.734646739 +0200 |
28507 | @@ -0,0 +1,244 @@ | |
1facf9fc | 28508 | +/* |
027c5e7a | 28509 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 28510 | + * |
28511 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28512 | + * it under the terms of the GNU General Public License as published by | |
28513 | + * the Free Software Foundation; either version 2 of the License, or | |
28514 | + * (at your option) any later version. | |
dece6358 AM |
28515 | + * |
28516 | + * This program is distributed in the hope that it will be useful, | |
28517 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28518 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28519 | + * GNU General Public License for more details. | |
28520 | + * | |
28521 | + * You should have received a copy of the GNU General Public License | |
28522 | + * along with this program; if not, write to the Free Software | |
28523 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 28524 | + */ |
28525 | + | |
28526 | +/* | |
28527 | + * workqueue for asynchronous/super-io operations | |
28528 | + * todo: try new dredential scheme | |
28529 | + */ | |
28530 | + | |
dece6358 | 28531 | +#include <linux/module.h> |
1facf9fc | 28532 | +#include "aufs.h" |
28533 | + | |
b752ccd1 AM |
28534 | +/* internal workqueue named AUFS_WKQ_NAME and AUFS_WKQ_PRE_NAME */ |
28535 | +enum { | |
28536 | + AuWkq_INORMAL, | |
28537 | + AuWkq_IPRE | |
28538 | +}; | |
28539 | + | |
28540 | +static struct { | |
28541 | + char *name; | |
28542 | + struct workqueue_struct *wkq; | |
28543 | +} au_wkq[] = { | |
28544 | + [AuWkq_INORMAL] = { | |
28545 | + .name = AUFS_WKQ_NAME | |
28546 | + }, | |
28547 | + [AuWkq_IPRE] = { | |
28548 | + .name = AUFS_WKQ_PRE_NAME | |
28549 | + } | |
28550 | +}; | |
1facf9fc | 28551 | + |
28552 | +struct au_wkinfo { | |
28553 | + struct work_struct wk; | |
7f207e10 | 28554 | + struct kobject *kobj; |
1facf9fc | 28555 | + |
28556 | + unsigned int flags; /* see wkq.h */ | |
28557 | + | |
28558 | + au_wkq_func_t func; | |
28559 | + void *args; | |
28560 | + | |
1facf9fc | 28561 | + struct completion *comp; |
28562 | +}; | |
28563 | + | |
28564 | +/* ---------------------------------------------------------------------- */ | |
28565 | + | |
1facf9fc | 28566 | +static void wkq_func(struct work_struct *wk) |
28567 | +{ | |
28568 | + struct au_wkinfo *wkinfo = container_of(wk, struct au_wkinfo, wk); | |
28569 | + | |
7f207e10 AM |
28570 | + AuDebugOn(current_fsuid()); |
28571 | + AuDebugOn(rlimit(RLIMIT_FSIZE) != RLIM_INFINITY); | |
28572 | + | |
1facf9fc | 28573 | + wkinfo->func(wkinfo->args); |
1facf9fc | 28574 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) |
28575 | + complete(wkinfo->comp); | |
28576 | + else { | |
7f207e10 | 28577 | + kobject_put(wkinfo->kobj); |
1facf9fc | 28578 | + module_put(THIS_MODULE); |
28579 | + kfree(wkinfo); | |
28580 | + } | |
28581 | +} | |
28582 | + | |
28583 | +/* | |
28584 | + * Since struct completion is large, try allocating it dynamically. | |
28585 | + */ | |
28586 | +#if defined(CONFIG_4KSTACKS) || defined(AuTest4KSTACKS) | |
28587 | +#define AuWkqCompDeclare(name) struct completion *comp = NULL | |
28588 | + | |
28589 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
28590 | +{ | |
28591 | + *comp = kmalloc(sizeof(**comp), GFP_NOFS); | |
28592 | + if (*comp) { | |
28593 | + init_completion(*comp); | |
28594 | + wkinfo->comp = *comp; | |
28595 | + return 0; | |
28596 | + } | |
28597 | + return -ENOMEM; | |
28598 | +} | |
28599 | + | |
28600 | +static void au_wkq_comp_free(struct completion *comp) | |
28601 | +{ | |
28602 | + kfree(comp); | |
28603 | +} | |
28604 | + | |
28605 | +#else | |
28606 | + | |
28607 | +/* no braces */ | |
28608 | +#define AuWkqCompDeclare(name) \ | |
28609 | + DECLARE_COMPLETION_ONSTACK(_ ## name); \ | |
28610 | + struct completion *comp = &_ ## name | |
28611 | + | |
28612 | +static int au_wkq_comp_alloc(struct au_wkinfo *wkinfo, struct completion **comp) | |
28613 | +{ | |
28614 | + wkinfo->comp = *comp; | |
28615 | + return 0; | |
28616 | +} | |
28617 | + | |
28618 | +static void au_wkq_comp_free(struct completion *comp __maybe_unused) | |
28619 | +{ | |
28620 | + /* empty */ | |
28621 | +} | |
28622 | +#endif /* 4KSTACKS */ | |
28623 | + | |
53392da6 | 28624 | +static void au_wkq_run(struct au_wkinfo *wkinfo) |
1facf9fc | 28625 | +{ |
b752ccd1 AM |
28626 | + struct workqueue_struct *wkq; |
28627 | + | |
53392da6 AM |
28628 | + if (au_ftest_wkq(wkinfo->flags, NEST)) { |
28629 | + if (au_wkq_test()) { | |
28630 | + AuWarn1("wkq from wkq, due to a dead dir by UDBA?\n"); | |
28631 | + AuDebugOn(au_ftest_wkq(wkinfo->flags, WAIT)); | |
28632 | + } | |
28633 | + } else | |
28634 | + au_dbg_verify_kthread(); | |
28635 | + | |
28636 | + if (au_ftest_wkq(wkinfo->flags, WAIT)) { | |
a1f66529 | 28637 | + INIT_WORK_ONSTACK(&wkinfo->wk, wkq_func); |
b752ccd1 | 28638 | + wkq = au_wkq[AuWkq_INORMAL].wkq; |
53392da6 | 28639 | + if (au_ftest_wkq(wkinfo->flags, PRE)) |
b752ccd1 AM |
28640 | + wkq = au_wkq[AuWkq_IPRE].wkq; |
28641 | + queue_work(wkq, &wkinfo->wk); | |
4a4d8108 AM |
28642 | + } else { |
28643 | + INIT_WORK(&wkinfo->wk, wkq_func); | |
28644 | + schedule_work(&wkinfo->wk); | |
28645 | + } | |
1facf9fc | 28646 | +} |
28647 | + | |
7f207e10 AM |
28648 | +/* |
28649 | + * Be careful. It is easy to make deadlock happen. | |
28650 | + * processA: lock, wkq and wait | |
28651 | + * processB: wkq and wait, lock in wkq | |
28652 | + * --> deadlock | |
28653 | + */ | |
b752ccd1 | 28654 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args) |
1facf9fc | 28655 | +{ |
28656 | + int err; | |
28657 | + AuWkqCompDeclare(comp); | |
28658 | + struct au_wkinfo wkinfo = { | |
b752ccd1 | 28659 | + .flags = flags, |
1facf9fc | 28660 | + .func = func, |
28661 | + .args = args | |
28662 | + }; | |
28663 | + | |
28664 | + err = au_wkq_comp_alloc(&wkinfo, &comp); | |
28665 | + if (!err) { | |
53392da6 | 28666 | + au_wkq_run(&wkinfo); |
1facf9fc | 28667 | + /* no timeout, no interrupt */ |
28668 | + wait_for_completion(wkinfo.comp); | |
28669 | + au_wkq_comp_free(comp); | |
4a4d8108 | 28670 | + destroy_work_on_stack(&wkinfo.wk); |
1facf9fc | 28671 | + } |
28672 | + | |
28673 | + return err; | |
28674 | + | |
28675 | +} | |
28676 | + | |
027c5e7a AM |
28677 | +/* |
28678 | + * Note: dget/dput() in func for aufs dentries are not supported. It will be a | |
28679 | + * problem in a concurrent umounting. | |
28680 | + */ | |
53392da6 AM |
28681 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
28682 | + unsigned int flags) | |
1facf9fc | 28683 | +{ |
28684 | + int err; | |
28685 | + struct au_wkinfo *wkinfo; | |
28686 | + | |
28687 | + atomic_inc(&au_sbi(sb)->si_nowait.nw_len); | |
28688 | + | |
28689 | + /* | |
28690 | + * wkq_func() must free this wkinfo. | |
28691 | + * it highly depends upon the implementation of workqueue. | |
28692 | + */ | |
28693 | + err = 0; | |
28694 | + wkinfo = kmalloc(sizeof(*wkinfo), GFP_NOFS); | |
28695 | + if (wkinfo) { | |
7f207e10 | 28696 | + wkinfo->kobj = &au_sbi(sb)->si_kobj; |
53392da6 | 28697 | + wkinfo->flags = flags & ~AuWkq_WAIT; |
1facf9fc | 28698 | + wkinfo->func = func; |
28699 | + wkinfo->args = args; | |
28700 | + wkinfo->comp = NULL; | |
7f207e10 | 28701 | + kobject_get(wkinfo->kobj); |
1facf9fc | 28702 | + __module_get(THIS_MODULE); |
28703 | + | |
53392da6 | 28704 | + au_wkq_run(wkinfo); |
1facf9fc | 28705 | + } else { |
28706 | + err = -ENOMEM; | |
e49829fe | 28707 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
1facf9fc | 28708 | + } |
28709 | + | |
28710 | + return err; | |
28711 | +} | |
28712 | + | |
28713 | +/* ---------------------------------------------------------------------- */ | |
28714 | + | |
28715 | +void au_nwt_init(struct au_nowait_tasks *nwt) | |
28716 | +{ | |
28717 | + atomic_set(&nwt->nw_len, 0); | |
4a4d8108 | 28718 | + /* smp_mb(); */ /* atomic_set */ |
1facf9fc | 28719 | + init_waitqueue_head(&nwt->nw_wq); |
28720 | +} | |
28721 | + | |
28722 | +void au_wkq_fin(void) | |
28723 | +{ | |
b752ccd1 AM |
28724 | + int i; |
28725 | + | |
28726 | + for (i = 0; i < ARRAY_SIZE(au_wkq); i++) | |
28727 | + if (au_wkq[i].wkq) | |
28728 | + destroy_workqueue(au_wkq[i].wkq); | |
1facf9fc | 28729 | +} |
28730 | + | |
28731 | +int __init au_wkq_init(void) | |
28732 | +{ | |
b752ccd1 AM |
28733 | + int err, i; |
28734 | + | |
28735 | + err = 0; | |
28736 | + for (i = 0; !err && i < ARRAY_SIZE(au_wkq); i++) { | |
7f207e10 AM |
28737 | + BUILD_BUG_ON(!WQ_RESCUER); |
28738 | + au_wkq[i].wkq = alloc_workqueue(au_wkq[i].name, !WQ_RESCUER, | |
28739 | + WQ_DFL_ACTIVE); | |
b752ccd1 AM |
28740 | + if (IS_ERR(au_wkq[i].wkq)) |
28741 | + err = PTR_ERR(au_wkq[i].wkq); | |
28742 | + else if (!au_wkq[i].wkq) | |
28743 | + err = -ENOMEM; | |
28744 | + if (unlikely(err)) | |
28745 | + au_wkq[i].wkq = NULL; | |
28746 | + } | |
7f207e10 | 28747 | + if (unlikely(err)) |
b752ccd1 AM |
28748 | + au_wkq_fin(); |
28749 | + | |
28750 | + return err; | |
1facf9fc | 28751 | +} |
7f207e10 AM |
28752 | diff -urN /usr/share/empty/fs/aufs/wkq.h linux/fs/aufs/wkq.h |
28753 | --- /usr/share/empty/fs/aufs/wkq.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
28754 | +++ linux/fs/aufs/wkq.h 2011-08-24 13:30:24.737979976 +0200 |
28755 | @@ -0,0 +1,101 @@ | |
1facf9fc | 28756 | +/* |
027c5e7a | 28757 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 28758 | + * |
28759 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28760 | + * it under the terms of the GNU General Public License as published by | |
28761 | + * the Free Software Foundation; either version 2 of the License, or | |
28762 | + * (at your option) any later version. | |
dece6358 AM |
28763 | + * |
28764 | + * This program is distributed in the hope that it will be useful, | |
28765 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28766 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28767 | + * GNU General Public License for more details. | |
28768 | + * | |
28769 | + * You should have received a copy of the GNU General Public License | |
28770 | + * along with this program; if not, write to the Free Software | |
28771 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 28772 | + */ |
28773 | + | |
28774 | +/* | |
28775 | + * workqueue for asynchronous/super-io operations | |
28776 | + * todo: try new credentials management scheme | |
28777 | + */ | |
28778 | + | |
28779 | +#ifndef __AUFS_WKQ_H__ | |
28780 | +#define __AUFS_WKQ_H__ | |
28781 | + | |
28782 | +#ifdef __KERNEL__ | |
28783 | + | |
1facf9fc | 28784 | +#include <linux/sched.h> |
dece6358 | 28785 | +#include <linux/wait.h> |
1facf9fc | 28786 | +#include <linux/aufs_type.h> |
28787 | + | |
dece6358 AM |
28788 | +struct super_block; |
28789 | + | |
1facf9fc | 28790 | +/* ---------------------------------------------------------------------- */ |
28791 | + | |
28792 | +/* | |
28793 | + * in the next operation, wait for the 'nowait' tasks in system-wide workqueue | |
28794 | + */ | |
28795 | +struct au_nowait_tasks { | |
28796 | + atomic_t nw_len; | |
28797 | + wait_queue_head_t nw_wq; | |
28798 | +}; | |
28799 | + | |
28800 | +/* ---------------------------------------------------------------------- */ | |
28801 | + | |
28802 | +typedef void (*au_wkq_func_t)(void *args); | |
28803 | + | |
28804 | +/* wkq flags */ | |
28805 | +#define AuWkq_WAIT 1 | |
b752ccd1 | 28806 | +#define AuWkq_PRE (1 << 1) |
53392da6 AM |
28807 | +#ifdef CONFIG_AUFS_HNOTIFY |
28808 | +#define AuWkq_NEST (1 << 2) | |
28809 | +#else | |
28810 | +#define AuWkq_NEST 0 | |
28811 | +#endif | |
1facf9fc | 28812 | +#define au_ftest_wkq(flags, name) ((flags) & AuWkq_##name) |
7f207e10 AM |
28813 | +#define au_fset_wkq(flags, name) \ |
28814 | + do { (flags) |= AuWkq_##name; } while (0) | |
28815 | +#define au_fclr_wkq(flags, name) \ | |
28816 | + do { (flags) &= ~AuWkq_##name; } while (0) | |
1facf9fc | 28817 | + |
28818 | +/* wkq.c */ | |
b752ccd1 | 28819 | +int au_wkq_do_wait(unsigned int flags, au_wkq_func_t func, void *args); |
53392da6 AM |
28820 | +int au_wkq_nowait(au_wkq_func_t func, void *args, struct super_block *sb, |
28821 | + unsigned int flags); | |
1facf9fc | 28822 | +void au_nwt_init(struct au_nowait_tasks *nwt); |
28823 | +int __init au_wkq_init(void); | |
28824 | +void au_wkq_fin(void); | |
28825 | + | |
28826 | +/* ---------------------------------------------------------------------- */ | |
28827 | + | |
53392da6 AM |
28828 | +static inline int au_wkq_test(void) |
28829 | +{ | |
28830 | + return current->flags & PF_WQ_WORKER; | |
28831 | +} | |
28832 | + | |
b752ccd1 AM |
28833 | +static inline int au_wkq_wait_pre(au_wkq_func_t func, void *args) |
28834 | +{ | |
28835 | + return au_wkq_do_wait(AuWkq_WAIT | AuWkq_PRE, func, args); | |
28836 | +} | |
28837 | + | |
28838 | +static inline int au_wkq_wait(au_wkq_func_t func, void *args) | |
1facf9fc | 28839 | +{ |
b752ccd1 | 28840 | + return au_wkq_do_wait(AuWkq_WAIT, func, args); |
1facf9fc | 28841 | +} |
28842 | + | |
28843 | +static inline void au_nwt_done(struct au_nowait_tasks *nwt) | |
28844 | +{ | |
e49829fe | 28845 | + if (atomic_dec_and_test(&nwt->nw_len)) |
1facf9fc | 28846 | + wake_up_all(&nwt->nw_wq); |
28847 | +} | |
28848 | + | |
28849 | +static inline int au_nwt_flush(struct au_nowait_tasks *nwt) | |
28850 | +{ | |
28851 | + wait_event(nwt->nw_wq, !atomic_read(&nwt->nw_len)); | |
28852 | + return 0; | |
28853 | +} | |
28854 | + | |
28855 | +#endif /* __KERNEL__ */ | |
28856 | +#endif /* __AUFS_WKQ_H__ */ | |
7f207e10 AM |
28857 | diff -urN /usr/share/empty/fs/aufs/xino.c linux/fs/aufs/xino.c |
28858 | --- /usr/share/empty/fs/aufs/xino.c 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 | 28859 | +++ linux/fs/aufs/xino.c 2011-08-24 13:30:24.737979976 +0200 |
7f207e10 | 28860 | @@ -0,0 +1,1265 @@ |
1facf9fc | 28861 | +/* |
027c5e7a | 28862 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
1facf9fc | 28863 | + * |
28864 | + * This program, aufs is free software; you can redistribute it and/or modify | |
28865 | + * it under the terms of the GNU General Public License as published by | |
28866 | + * the Free Software Foundation; either version 2 of the License, or | |
28867 | + * (at your option) any later version. | |
dece6358 AM |
28868 | + * |
28869 | + * This program is distributed in the hope that it will be useful, | |
28870 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
28871 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
28872 | + * GNU General Public License for more details. | |
28873 | + * | |
28874 | + * You should have received a copy of the GNU General Public License | |
28875 | + * along with this program; if not, write to the Free Software | |
28876 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1facf9fc | 28877 | + */ |
28878 | + | |
28879 | +/* | |
28880 | + * external inode number translation table and bitmap | |
28881 | + */ | |
28882 | + | |
dece6358 | 28883 | +#include <linux/file.h> |
1facf9fc | 28884 | +#include <linux/seq_file.h> |
28885 | +#include <linux/uaccess.h> | |
28886 | +#include "aufs.h" | |
28887 | + | |
b752ccd1 | 28888 | +ssize_t xino_fread(au_readf_t func, struct file *file, void *kbuf, size_t size, |
1facf9fc | 28889 | + loff_t *pos) |
28890 | +{ | |
28891 | + ssize_t err; | |
28892 | + mm_segment_t oldfs; | |
b752ccd1 AM |
28893 | + union { |
28894 | + void *k; | |
28895 | + char __user *u; | |
28896 | + } buf; | |
1facf9fc | 28897 | + |
b752ccd1 | 28898 | + buf.k = kbuf; |
1facf9fc | 28899 | + oldfs = get_fs(); |
28900 | + set_fs(KERNEL_DS); | |
28901 | + do { | |
28902 | + /* todo: signal_pending? */ | |
b752ccd1 | 28903 | + err = func(file, buf.u, size, pos); |
1facf9fc | 28904 | + } while (err == -EAGAIN || err == -EINTR); |
28905 | + set_fs(oldfs); | |
28906 | + | |
28907 | +#if 0 /* reserved for future use */ | |
28908 | + if (err > 0) | |
28909 | + fsnotify_access(file->f_dentry); | |
28910 | +#endif | |
28911 | + | |
28912 | + return err; | |
28913 | +} | |
28914 | + | |
28915 | +/* ---------------------------------------------------------------------- */ | |
28916 | + | |
b752ccd1 | 28917 | +static ssize_t do_xino_fwrite(au_writef_t func, struct file *file, void *kbuf, |
1facf9fc | 28918 | + size_t size, loff_t *pos) |
28919 | +{ | |
28920 | + ssize_t err; | |
28921 | + mm_segment_t oldfs; | |
b752ccd1 AM |
28922 | + union { |
28923 | + void *k; | |
28924 | + const char __user *u; | |
28925 | + } buf; | |
1facf9fc | 28926 | + |
b752ccd1 | 28927 | + buf.k = kbuf; |
1facf9fc | 28928 | + oldfs = get_fs(); |
28929 | + set_fs(KERNEL_DS); | |
1facf9fc | 28930 | + do { |
28931 | + /* todo: signal_pending? */ | |
b752ccd1 | 28932 | + err = func(file, buf.u, size, pos); |
1facf9fc | 28933 | + } while (err == -EAGAIN || err == -EINTR); |
1facf9fc | 28934 | + set_fs(oldfs); |
28935 | + | |
28936 | +#if 0 /* reserved for future use */ | |
28937 | + if (err > 0) | |
28938 | + fsnotify_modify(file->f_dentry); | |
28939 | +#endif | |
28940 | + | |
28941 | + return err; | |
28942 | +} | |
28943 | + | |
28944 | +struct do_xino_fwrite_args { | |
28945 | + ssize_t *errp; | |
28946 | + au_writef_t func; | |
28947 | + struct file *file; | |
28948 | + void *buf; | |
28949 | + size_t size; | |
28950 | + loff_t *pos; | |
28951 | +}; | |
28952 | + | |
28953 | +static void call_do_xino_fwrite(void *args) | |
28954 | +{ | |
28955 | + struct do_xino_fwrite_args *a = args; | |
28956 | + *a->errp = do_xino_fwrite(a->func, a->file, a->buf, a->size, a->pos); | |
28957 | +} | |
28958 | + | |
28959 | +ssize_t xino_fwrite(au_writef_t func, struct file *file, void *buf, size_t size, | |
28960 | + loff_t *pos) | |
28961 | +{ | |
28962 | + ssize_t err; | |
28963 | + | |
28964 | + /* todo: signal block and no wkq? */ | |
b752ccd1 AM |
28965 | + if (rlimit(RLIMIT_FSIZE) == RLIM_INFINITY) { |
28966 | + lockdep_off(); | |
28967 | + err = do_xino_fwrite(func, file, buf, size, pos); | |
28968 | + lockdep_on(); | |
28969 | + } else { | |
28970 | + /* | |
28971 | + * it breaks RLIMIT_FSIZE and normal user's limit, | |
28972 | + * users should care about quota and real 'filesystem full.' | |
28973 | + */ | |
1facf9fc | 28974 | + int wkq_err; |
28975 | + struct do_xino_fwrite_args args = { | |
28976 | + .errp = &err, | |
28977 | + .func = func, | |
28978 | + .file = file, | |
28979 | + .buf = buf, | |
28980 | + .size = size, | |
28981 | + .pos = pos | |
28982 | + }; | |
28983 | + | |
28984 | + wkq_err = au_wkq_wait(call_do_xino_fwrite, &args); | |
28985 | + if (unlikely(wkq_err)) | |
28986 | + err = wkq_err; | |
b752ccd1 | 28987 | + } |
1facf9fc | 28988 | + |
28989 | + return err; | |
28990 | +} | |
28991 | + | |
28992 | +/* ---------------------------------------------------------------------- */ | |
28993 | + | |
28994 | +/* | |
28995 | + * create a new xinofile at the same place/path as @base_file. | |
28996 | + */ | |
28997 | +struct file *au_xino_create2(struct file *base_file, struct file *copy_src) | |
28998 | +{ | |
28999 | + struct file *file; | |
4a4d8108 | 29000 | + struct dentry *base, *parent; |
1facf9fc | 29001 | + struct inode *dir; |
29002 | + struct qstr *name; | |
1308ab2a | 29003 | + struct path path; |
4a4d8108 | 29004 | + int err; |
1facf9fc | 29005 | + |
29006 | + base = base_file->f_dentry; | |
29007 | + parent = base->d_parent; /* dir inode is locked */ | |
29008 | + dir = parent->d_inode; | |
29009 | + IMustLock(dir); | |
29010 | + | |
29011 | + file = ERR_PTR(-EINVAL); | |
29012 | + name = &base->d_name; | |
4a4d8108 AM |
29013 | + path.dentry = vfsub_lookup_one_len(name->name, parent, name->len); |
29014 | + if (IS_ERR(path.dentry)) { | |
29015 | + file = (void *)path.dentry; | |
29016 | + pr_err("%.*s lookup err %ld\n", | |
29017 | + AuLNPair(name), PTR_ERR(path.dentry)); | |
1facf9fc | 29018 | + goto out; |
29019 | + } | |
29020 | + | |
29021 | + /* no need to mnt_want_write() since we call dentry_open() later */ | |
4a4d8108 | 29022 | + err = vfs_create(dir, path.dentry, S_IRUGO | S_IWUGO, NULL); |
1facf9fc | 29023 | + if (unlikely(err)) { |
29024 | + file = ERR_PTR(err); | |
4a4d8108 | 29025 | + pr_err("%.*s create err %d\n", AuLNPair(name), err); |
1facf9fc | 29026 | + goto out_dput; |
29027 | + } | |
29028 | + | |
1308ab2a | 29029 | + path.mnt = base_file->f_vfsmnt; |
4a4d8108 | 29030 | + file = vfsub_dentry_open(&path, |
7f207e10 | 29031 | + O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE |
2cbb1c4b | 29032 | + /* | __FMODE_NONOTIFY */); |
1facf9fc | 29033 | + if (IS_ERR(file)) { |
4a4d8108 | 29034 | + pr_err("%.*s open err %ld\n", AuLNPair(name), PTR_ERR(file)); |
1facf9fc | 29035 | + goto out_dput; |
29036 | + } | |
29037 | + | |
29038 | + err = vfsub_unlink(dir, &file->f_path, /*force*/0); | |
29039 | + if (unlikely(err)) { | |
4a4d8108 | 29040 | + pr_err("%.*s unlink err %d\n", AuLNPair(name), err); |
1facf9fc | 29041 | + goto out_fput; |
29042 | + } | |
29043 | + | |
29044 | + if (copy_src) { | |
29045 | + /* no one can touch copy_src xino */ | |
29046 | + err = au_copy_file(file, copy_src, | |
29047 | + i_size_read(copy_src->f_dentry->d_inode)); | |
29048 | + if (unlikely(err)) { | |
4a4d8108 | 29049 | + pr_err("%.*s copy err %d\n", AuLNPair(name), err); |
1facf9fc | 29050 | + goto out_fput; |
29051 | + } | |
29052 | + } | |
29053 | + goto out_dput; /* success */ | |
29054 | + | |
4f0767ce | 29055 | +out_fput: |
1facf9fc | 29056 | + fput(file); |
29057 | + file = ERR_PTR(err); | |
4f0767ce | 29058 | +out_dput: |
4a4d8108 | 29059 | + dput(path.dentry); |
4f0767ce | 29060 | +out: |
1facf9fc | 29061 | + return file; |
29062 | +} | |
29063 | + | |
29064 | +struct au_xino_lock_dir { | |
29065 | + struct au_hinode *hdir; | |
29066 | + struct dentry *parent; | |
29067 | + struct mutex *mtx; | |
29068 | +}; | |
29069 | + | |
29070 | +static void au_xino_lock_dir(struct super_block *sb, struct file *xino, | |
29071 | + struct au_xino_lock_dir *ldir) | |
29072 | +{ | |
29073 | + aufs_bindex_t brid, bindex; | |
29074 | + | |
29075 | + ldir->hdir = NULL; | |
29076 | + bindex = -1; | |
29077 | + brid = au_xino_brid(sb); | |
29078 | + if (brid >= 0) | |
29079 | + bindex = au_br_index(sb, brid); | |
29080 | + if (bindex >= 0) { | |
29081 | + ldir->hdir = au_hi(sb->s_root->d_inode, bindex); | |
4a4d8108 | 29082 | + au_hn_imtx_lock_nested(ldir->hdir, AuLsc_I_PARENT); |
1facf9fc | 29083 | + } else { |
29084 | + ldir->parent = dget_parent(xino->f_dentry); | |
29085 | + ldir->mtx = &ldir->parent->d_inode->i_mutex; | |
29086 | + mutex_lock_nested(ldir->mtx, AuLsc_I_PARENT); | |
29087 | + } | |
29088 | +} | |
29089 | + | |
29090 | +static void au_xino_unlock_dir(struct au_xino_lock_dir *ldir) | |
29091 | +{ | |
29092 | + if (ldir->hdir) | |
4a4d8108 | 29093 | + au_hn_imtx_unlock(ldir->hdir); |
1facf9fc | 29094 | + else { |
29095 | + mutex_unlock(ldir->mtx); | |
29096 | + dput(ldir->parent); | |
29097 | + } | |
29098 | +} | |
29099 | + | |
29100 | +/* ---------------------------------------------------------------------- */ | |
29101 | + | |
29102 | +/* trucate xino files asynchronously */ | |
29103 | + | |
29104 | +int au_xino_trunc(struct super_block *sb, aufs_bindex_t bindex) | |
29105 | +{ | |
29106 | + int err; | |
29107 | + aufs_bindex_t bi, bend; | |
29108 | + struct au_branch *br; | |
29109 | + struct file *new_xino, *file; | |
29110 | + struct super_block *h_sb; | |
29111 | + struct au_xino_lock_dir ldir; | |
29112 | + | |
29113 | + err = -EINVAL; | |
29114 | + bend = au_sbend(sb); | |
29115 | + if (unlikely(bindex < 0 || bend < bindex)) | |
29116 | + goto out; | |
29117 | + br = au_sbr(sb, bindex); | |
29118 | + file = br->br_xino.xi_file; | |
29119 | + if (!file) | |
29120 | + goto out; | |
29121 | + | |
29122 | + au_xino_lock_dir(sb, file, &ldir); | |
29123 | + /* mnt_want_write() is unnecessary here */ | |
29124 | + new_xino = au_xino_create2(file, file); | |
29125 | + au_xino_unlock_dir(&ldir); | |
29126 | + err = PTR_ERR(new_xino); | |
29127 | + if (IS_ERR(new_xino)) | |
29128 | + goto out; | |
29129 | + err = 0; | |
29130 | + fput(file); | |
29131 | + br->br_xino.xi_file = new_xino; | |
29132 | + | |
29133 | + h_sb = br->br_mnt->mnt_sb; | |
29134 | + for (bi = 0; bi <= bend; bi++) { | |
29135 | + if (unlikely(bi == bindex)) | |
29136 | + continue; | |
29137 | + br = au_sbr(sb, bi); | |
29138 | + if (br->br_mnt->mnt_sb != h_sb) | |
29139 | + continue; | |
29140 | + | |
29141 | + fput(br->br_xino.xi_file); | |
29142 | + br->br_xino.xi_file = new_xino; | |
29143 | + get_file(new_xino); | |
29144 | + } | |
29145 | + | |
4f0767ce | 29146 | +out: |
1facf9fc | 29147 | + return err; |
29148 | +} | |
29149 | + | |
29150 | +struct xino_do_trunc_args { | |
29151 | + struct super_block *sb; | |
29152 | + struct au_branch *br; | |
29153 | +}; | |
29154 | + | |
29155 | +static void xino_do_trunc(void *_args) | |
29156 | +{ | |
29157 | + struct xino_do_trunc_args *args = _args; | |
29158 | + struct super_block *sb; | |
29159 | + struct au_branch *br; | |
29160 | + struct inode *dir; | |
29161 | + int err; | |
29162 | + aufs_bindex_t bindex; | |
29163 | + | |
29164 | + err = 0; | |
29165 | + sb = args->sb; | |
29166 | + dir = sb->s_root->d_inode; | |
29167 | + br = args->br; | |
29168 | + | |
29169 | + si_noflush_write_lock(sb); | |
29170 | + ii_read_lock_parent(dir); | |
29171 | + bindex = au_br_index(sb, br->br_id); | |
29172 | + err = au_xino_trunc(sb, bindex); | |
dece6358 AM |
29173 | + if (!err |
29174 | + && br->br_xino.xi_file->f_dentry->d_inode->i_blocks | |
1facf9fc | 29175 | + >= br->br_xino_upper) |
29176 | + br->br_xino_upper += AUFS_XINO_TRUNC_STEP; | |
29177 | + | |
1facf9fc | 29178 | + ii_read_unlock(dir); |
29179 | + if (unlikely(err)) | |
4a4d8108 | 29180 | + pr_warning("err b%d, (%d)\n", bindex, err); |
1facf9fc | 29181 | + atomic_dec(&br->br_xino_running); |
29182 | + atomic_dec(&br->br_count); | |
1facf9fc | 29183 | + si_write_unlock(sb); |
027c5e7a | 29184 | + au_nwt_done(&au_sbi(sb)->si_nowait); |
1facf9fc | 29185 | + kfree(args); |
29186 | +} | |
29187 | + | |
29188 | +static void xino_try_trunc(struct super_block *sb, struct au_branch *br) | |
29189 | +{ | |
29190 | + struct xino_do_trunc_args *args; | |
29191 | + int wkq_err; | |
29192 | + | |
29193 | + if (br->br_xino.xi_file->f_dentry->d_inode->i_blocks | |
29194 | + < br->br_xino_upper) | |
29195 | + return; | |
29196 | + | |
29197 | + if (atomic_inc_return(&br->br_xino_running) > 1) | |
29198 | + goto out; | |
29199 | + | |
29200 | + /* lock and kfree() will be called in trunc_xino() */ | |
29201 | + args = kmalloc(sizeof(*args), GFP_NOFS); | |
29202 | + if (unlikely(!args)) { | |
29203 | + AuErr1("no memory\n"); | |
29204 | + goto out_args; | |
29205 | + } | |
29206 | + | |
e49829fe | 29207 | + atomic_inc(&br->br_count); |
1facf9fc | 29208 | + args->sb = sb; |
29209 | + args->br = br; | |
53392da6 | 29210 | + wkq_err = au_wkq_nowait(xino_do_trunc, args, sb, /*flags*/0); |
1facf9fc | 29211 | + if (!wkq_err) |
29212 | + return; /* success */ | |
29213 | + | |
4a4d8108 | 29214 | + pr_err("wkq %d\n", wkq_err); |
e49829fe | 29215 | + atomic_dec(&br->br_count); |
1facf9fc | 29216 | + |
4f0767ce | 29217 | +out_args: |
1facf9fc | 29218 | + kfree(args); |
4f0767ce | 29219 | +out: |
e49829fe | 29220 | + atomic_dec(&br->br_xino_running); |
1facf9fc | 29221 | +} |
29222 | + | |
29223 | +/* ---------------------------------------------------------------------- */ | |
29224 | + | |
29225 | +static int au_xino_do_write(au_writef_t write, struct file *file, | |
29226 | + ino_t h_ino, ino_t ino) | |
29227 | +{ | |
29228 | + loff_t pos; | |
29229 | + ssize_t sz; | |
29230 | + | |
29231 | + pos = h_ino; | |
29232 | + if (unlikely(au_loff_max / sizeof(ino) - 1 < pos)) { | |
29233 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
29234 | + return -EFBIG; | |
29235 | + } | |
29236 | + pos *= sizeof(ino); | |
29237 | + sz = xino_fwrite(write, file, &ino, sizeof(ino), &pos); | |
29238 | + if (sz == sizeof(ino)) | |
29239 | + return 0; /* success */ | |
29240 | + | |
29241 | + AuIOErr("write failed (%zd)\n", sz); | |
29242 | + return -EIO; | |
29243 | +} | |
29244 | + | |
29245 | +/* | |
29246 | + * write @ino to the xinofile for the specified branch{@sb, @bindex} | |
29247 | + * at the position of @h_ino. | |
29248 | + * even if @ino is zero, it is written to the xinofile and means no entry. | |
29249 | + * if the size of the xino file on a specific filesystem exceeds the watermark, | |
29250 | + * try truncating it. | |
29251 | + */ | |
29252 | +int au_xino_write(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
29253 | + ino_t ino) | |
29254 | +{ | |
29255 | + int err; | |
29256 | + unsigned int mnt_flags; | |
29257 | + struct au_branch *br; | |
29258 | + | |
29259 | + BUILD_BUG_ON(sizeof(long long) != sizeof(au_loff_max) | |
29260 | + || ((loff_t)-1) > 0); | |
dece6358 | 29261 | + SiMustAnyLock(sb); |
1facf9fc | 29262 | + |
29263 | + mnt_flags = au_mntflags(sb); | |
29264 | + if (!au_opt_test(mnt_flags, XINO)) | |
29265 | + return 0; | |
29266 | + | |
29267 | + br = au_sbr(sb, bindex); | |
29268 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file, | |
29269 | + h_ino, ino); | |
29270 | + if (!err) { | |
29271 | + if (au_opt_test(mnt_flags, TRUNC_XINO) | |
29272 | + && au_test_fs_trunc_xino(br->br_mnt->mnt_sb)) | |
29273 | + xino_try_trunc(sb, br); | |
29274 | + return 0; /* success */ | |
29275 | + } | |
29276 | + | |
29277 | + AuIOErr("write failed (%d)\n", err); | |
29278 | + return -EIO; | |
29279 | +} | |
29280 | + | |
29281 | +/* ---------------------------------------------------------------------- */ | |
29282 | + | |
29283 | +/* aufs inode number bitmap */ | |
29284 | + | |
29285 | +static const int page_bits = (int)PAGE_SIZE * BITS_PER_BYTE; | |
29286 | +static ino_t xib_calc_ino(unsigned long pindex, int bit) | |
29287 | +{ | |
29288 | + ino_t ino; | |
29289 | + | |
29290 | + AuDebugOn(bit < 0 || page_bits <= bit); | |
29291 | + ino = AUFS_FIRST_INO + pindex * page_bits + bit; | |
29292 | + return ino; | |
29293 | +} | |
29294 | + | |
29295 | +static void xib_calc_bit(ino_t ino, unsigned long *pindex, int *bit) | |
29296 | +{ | |
29297 | + AuDebugOn(ino < AUFS_FIRST_INO); | |
29298 | + ino -= AUFS_FIRST_INO; | |
29299 | + *pindex = ino / page_bits; | |
29300 | + *bit = ino % page_bits; | |
29301 | +} | |
29302 | + | |
29303 | +static int xib_pindex(struct super_block *sb, unsigned long pindex) | |
29304 | +{ | |
29305 | + int err; | |
29306 | + loff_t pos; | |
29307 | + ssize_t sz; | |
29308 | + struct au_sbinfo *sbinfo; | |
29309 | + struct file *xib; | |
29310 | + unsigned long *p; | |
29311 | + | |
29312 | + sbinfo = au_sbi(sb); | |
29313 | + MtxMustLock(&sbinfo->si_xib_mtx); | |
29314 | + AuDebugOn(pindex > ULONG_MAX / PAGE_SIZE | |
29315 | + || !au_opt_test(sbinfo->si_mntflags, XINO)); | |
29316 | + | |
29317 | + if (pindex == sbinfo->si_xib_last_pindex) | |
29318 | + return 0; | |
29319 | + | |
29320 | + xib = sbinfo->si_xib; | |
29321 | + p = sbinfo->si_xib_buf; | |
29322 | + pos = sbinfo->si_xib_last_pindex; | |
29323 | + pos *= PAGE_SIZE; | |
29324 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
29325 | + if (unlikely(sz != PAGE_SIZE)) | |
29326 | + goto out; | |
29327 | + | |
29328 | + pos = pindex; | |
29329 | + pos *= PAGE_SIZE; | |
29330 | + if (i_size_read(xib->f_dentry->d_inode) >= pos + PAGE_SIZE) | |
29331 | + sz = xino_fread(sbinfo->si_xread, xib, p, PAGE_SIZE, &pos); | |
29332 | + else { | |
29333 | + memset(p, 0, PAGE_SIZE); | |
29334 | + sz = xino_fwrite(sbinfo->si_xwrite, xib, p, PAGE_SIZE, &pos); | |
29335 | + } | |
29336 | + if (sz == PAGE_SIZE) { | |
29337 | + sbinfo->si_xib_last_pindex = pindex; | |
29338 | + return 0; /* success */ | |
29339 | + } | |
29340 | + | |
4f0767ce | 29341 | +out: |
b752ccd1 AM |
29342 | + AuIOErr1("write failed (%zd)\n", sz); |
29343 | + err = sz; | |
29344 | + if (sz >= 0) | |
29345 | + err = -EIO; | |
29346 | + return err; | |
29347 | +} | |
29348 | + | |
29349 | +/* ---------------------------------------------------------------------- */ | |
29350 | + | |
29351 | +static void au_xib_clear_bit(struct inode *inode) | |
29352 | +{ | |
29353 | + int err, bit; | |
29354 | + unsigned long pindex; | |
29355 | + struct super_block *sb; | |
29356 | + struct au_sbinfo *sbinfo; | |
29357 | + | |
29358 | + AuDebugOn(inode->i_nlink); | |
29359 | + | |
29360 | + sb = inode->i_sb; | |
29361 | + xib_calc_bit(inode->i_ino, &pindex, &bit); | |
29362 | + AuDebugOn(page_bits <= bit); | |
29363 | + sbinfo = au_sbi(sb); | |
29364 | + mutex_lock(&sbinfo->si_xib_mtx); | |
29365 | + err = xib_pindex(sb, pindex); | |
29366 | + if (!err) { | |
29367 | + clear_bit(bit, sbinfo->si_xib_buf); | |
29368 | + sbinfo->si_xib_next_bit = bit; | |
29369 | + } | |
29370 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
29371 | +} | |
29372 | + | |
29373 | +/* for s_op->delete_inode() */ | |
29374 | +void au_xino_delete_inode(struct inode *inode, const int unlinked) | |
29375 | +{ | |
29376 | + int err; | |
29377 | + unsigned int mnt_flags; | |
29378 | + aufs_bindex_t bindex, bend, bi; | |
29379 | + unsigned char try_trunc; | |
29380 | + struct au_iinfo *iinfo; | |
29381 | + struct super_block *sb; | |
29382 | + struct au_hinode *hi; | |
29383 | + struct inode *h_inode; | |
29384 | + struct au_branch *br; | |
29385 | + au_writef_t xwrite; | |
29386 | + | |
29387 | + sb = inode->i_sb; | |
29388 | + mnt_flags = au_mntflags(sb); | |
29389 | + if (!au_opt_test(mnt_flags, XINO) | |
29390 | + || inode->i_ino == AUFS_ROOT_INO) | |
29391 | + return; | |
29392 | + | |
29393 | + if (unlinked) { | |
29394 | + au_xigen_inc(inode); | |
29395 | + au_xib_clear_bit(inode); | |
29396 | + } | |
29397 | + | |
29398 | + iinfo = au_ii(inode); | |
29399 | + if (!iinfo) | |
29400 | + return; | |
1facf9fc | 29401 | + |
b752ccd1 AM |
29402 | + bindex = iinfo->ii_bstart; |
29403 | + if (bindex < 0) | |
29404 | + return; | |
1facf9fc | 29405 | + |
b752ccd1 AM |
29406 | + xwrite = au_sbi(sb)->si_xwrite; |
29407 | + try_trunc = !!au_opt_test(mnt_flags, TRUNC_XINO); | |
29408 | + hi = iinfo->ii_hinode + bindex; | |
29409 | + bend = iinfo->ii_bend; | |
29410 | + for (; bindex <= bend; bindex++, hi++) { | |
29411 | + h_inode = hi->hi_inode; | |
29412 | + if (!h_inode | |
29413 | + || (!unlinked && h_inode->i_nlink)) | |
29414 | + continue; | |
1facf9fc | 29415 | + |
b752ccd1 AM |
29416 | + /* inode may not be revalidated */ |
29417 | + bi = au_br_index(sb, hi->hi_id); | |
29418 | + if (bi < 0) | |
29419 | + continue; | |
1facf9fc | 29420 | + |
b752ccd1 AM |
29421 | + br = au_sbr(sb, bi); |
29422 | + err = au_xino_do_write(xwrite, br->br_xino.xi_file, | |
29423 | + h_inode->i_ino, /*ino*/0); | |
29424 | + if (!err && try_trunc | |
29425 | + && au_test_fs_trunc_xino(br->br_mnt->mnt_sb)) | |
29426 | + xino_try_trunc(sb, br); | |
1facf9fc | 29427 | + } |
1facf9fc | 29428 | +} |
29429 | + | |
29430 | +/* get an unused inode number from bitmap */ | |
29431 | +ino_t au_xino_new_ino(struct super_block *sb) | |
29432 | +{ | |
29433 | + ino_t ino; | |
29434 | + unsigned long *p, pindex, ul, pend; | |
29435 | + struct au_sbinfo *sbinfo; | |
29436 | + struct file *file; | |
29437 | + int free_bit, err; | |
29438 | + | |
29439 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
29440 | + return iunique(sb, AUFS_FIRST_INO); | |
29441 | + | |
29442 | + sbinfo = au_sbi(sb); | |
29443 | + mutex_lock(&sbinfo->si_xib_mtx); | |
29444 | + p = sbinfo->si_xib_buf; | |
29445 | + free_bit = sbinfo->si_xib_next_bit; | |
29446 | + if (free_bit < page_bits && !test_bit(free_bit, p)) | |
29447 | + goto out; /* success */ | |
29448 | + free_bit = find_first_zero_bit(p, page_bits); | |
29449 | + if (free_bit < page_bits) | |
29450 | + goto out; /* success */ | |
29451 | + | |
29452 | + pindex = sbinfo->si_xib_last_pindex; | |
29453 | + for (ul = pindex - 1; ul < ULONG_MAX; ul--) { | |
29454 | + err = xib_pindex(sb, ul); | |
29455 | + if (unlikely(err)) | |
29456 | + goto out_err; | |
29457 | + free_bit = find_first_zero_bit(p, page_bits); | |
29458 | + if (free_bit < page_bits) | |
29459 | + goto out; /* success */ | |
29460 | + } | |
29461 | + | |
29462 | + file = sbinfo->si_xib; | |
29463 | + pend = i_size_read(file->f_dentry->d_inode) / PAGE_SIZE; | |
29464 | + for (ul = pindex + 1; ul <= pend; ul++) { | |
29465 | + err = xib_pindex(sb, ul); | |
29466 | + if (unlikely(err)) | |
29467 | + goto out_err; | |
29468 | + free_bit = find_first_zero_bit(p, page_bits); | |
29469 | + if (free_bit < page_bits) | |
29470 | + goto out; /* success */ | |
29471 | + } | |
29472 | + BUG(); | |
29473 | + | |
4f0767ce | 29474 | +out: |
1facf9fc | 29475 | + set_bit(free_bit, p); |
7f207e10 | 29476 | + sbinfo->si_xib_next_bit = free_bit + 1; |
1facf9fc | 29477 | + pindex = sbinfo->si_xib_last_pindex; |
29478 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
29479 | + ino = xib_calc_ino(pindex, free_bit); | |
29480 | + AuDbg("i%lu\n", (unsigned long)ino); | |
29481 | + return ino; | |
4f0767ce | 29482 | +out_err: |
1facf9fc | 29483 | + mutex_unlock(&sbinfo->si_xib_mtx); |
29484 | + AuDbg("i0\n"); | |
29485 | + return 0; | |
29486 | +} | |
29487 | + | |
29488 | +/* | |
29489 | + * read @ino from xinofile for the specified branch{@sb, @bindex} | |
29490 | + * at the position of @h_ino. | |
29491 | + * if @ino does not exist and @do_new is true, get new one. | |
29492 | + */ | |
29493 | +int au_xino_read(struct super_block *sb, aufs_bindex_t bindex, ino_t h_ino, | |
29494 | + ino_t *ino) | |
29495 | +{ | |
29496 | + int err; | |
29497 | + ssize_t sz; | |
29498 | + loff_t pos; | |
29499 | + struct file *file; | |
29500 | + struct au_sbinfo *sbinfo; | |
29501 | + | |
29502 | + *ino = 0; | |
29503 | + if (!au_opt_test(au_mntflags(sb), XINO)) | |
29504 | + return 0; /* no xino */ | |
29505 | + | |
29506 | + err = 0; | |
29507 | + sbinfo = au_sbi(sb); | |
29508 | + pos = h_ino; | |
29509 | + if (unlikely(au_loff_max / sizeof(*ino) - 1 < pos)) { | |
29510 | + AuIOErr1("too large hi%lu\n", (unsigned long)h_ino); | |
29511 | + return -EFBIG; | |
29512 | + } | |
29513 | + pos *= sizeof(*ino); | |
29514 | + | |
29515 | + file = au_sbr(sb, bindex)->br_xino.xi_file; | |
29516 | + if (i_size_read(file->f_dentry->d_inode) < pos + sizeof(*ino)) | |
29517 | + return 0; /* no ino */ | |
29518 | + | |
29519 | + sz = xino_fread(sbinfo->si_xread, file, ino, sizeof(*ino), &pos); | |
29520 | + if (sz == sizeof(*ino)) | |
29521 | + return 0; /* success */ | |
29522 | + | |
29523 | + err = sz; | |
29524 | + if (unlikely(sz >= 0)) { | |
29525 | + err = -EIO; | |
29526 | + AuIOErr("xino read error (%zd)\n", sz); | |
29527 | + } | |
29528 | + | |
29529 | + return err; | |
29530 | +} | |
29531 | + | |
29532 | +/* ---------------------------------------------------------------------- */ | |
29533 | + | |
29534 | +/* create and set a new xino file */ | |
29535 | + | |
29536 | +struct file *au_xino_create(struct super_block *sb, char *fname, int silent) | |
29537 | +{ | |
29538 | + struct file *file; | |
29539 | + struct dentry *h_parent, *d; | |
29540 | + struct inode *h_dir; | |
29541 | + int err; | |
29542 | + | |
29543 | + /* | |
29544 | + * at mount-time, and the xino file is the default path, | |
4a4d8108 | 29545 | + * hnotify is disabled so we have no notify events to ignore. |
1facf9fc | 29546 | + * when a user specified the xino, we cannot get au_hdir to be ignored. |
29547 | + */ | |
7f207e10 | 29548 | + file = vfsub_filp_open(fname, O_RDWR | O_CREAT | O_EXCL | O_LARGEFILE |
2cbb1c4b | 29549 | + /* | __FMODE_NONOTIFY */, |
1facf9fc | 29550 | + S_IRUGO | S_IWUGO); |
29551 | + if (IS_ERR(file)) { | |
29552 | + if (!silent) | |
4a4d8108 | 29553 | + pr_err("open %s(%ld)\n", fname, PTR_ERR(file)); |
1facf9fc | 29554 | + return file; |
29555 | + } | |
29556 | + | |
29557 | + /* keep file count */ | |
29558 | + h_parent = dget_parent(file->f_dentry); | |
29559 | + h_dir = h_parent->d_inode; | |
29560 | + mutex_lock_nested(&h_dir->i_mutex, AuLsc_I_PARENT); | |
29561 | + /* mnt_want_write() is unnecessary here */ | |
29562 | + err = vfsub_unlink(h_dir, &file->f_path, /*force*/0); | |
29563 | + mutex_unlock(&h_dir->i_mutex); | |
29564 | + dput(h_parent); | |
29565 | + if (unlikely(err)) { | |
29566 | + if (!silent) | |
4a4d8108 | 29567 | + pr_err("unlink %s(%d)\n", fname, err); |
1facf9fc | 29568 | + goto out; |
29569 | + } | |
29570 | + | |
29571 | + err = -EINVAL; | |
29572 | + d = file->f_dentry; | |
29573 | + if (unlikely(sb == d->d_sb)) { | |
29574 | + if (!silent) | |
4a4d8108 | 29575 | + pr_err("%s must be outside\n", fname); |
1facf9fc | 29576 | + goto out; |
29577 | + } | |
29578 | + if (unlikely(au_test_fs_bad_xino(d->d_sb))) { | |
29579 | + if (!silent) | |
4a4d8108 AM |
29580 | + pr_err("xino doesn't support %s(%s)\n", |
29581 | + fname, au_sbtype(d->d_sb)); | |
1facf9fc | 29582 | + goto out; |
29583 | + } | |
29584 | + return file; /* success */ | |
29585 | + | |
4f0767ce | 29586 | +out: |
1facf9fc | 29587 | + fput(file); |
29588 | + file = ERR_PTR(err); | |
29589 | + return file; | |
29590 | +} | |
29591 | + | |
29592 | +/* | |
29593 | + * find another branch who is on the same filesystem of the specified | |
29594 | + * branch{@btgt}. search until @bend. | |
29595 | + */ | |
29596 | +static int is_sb_shared(struct super_block *sb, aufs_bindex_t btgt, | |
29597 | + aufs_bindex_t bend) | |
29598 | +{ | |
29599 | + aufs_bindex_t bindex; | |
29600 | + struct super_block *tgt_sb = au_sbr_sb(sb, btgt); | |
29601 | + | |
29602 | + for (bindex = 0; bindex < btgt; bindex++) | |
29603 | + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex))) | |
29604 | + return bindex; | |
29605 | + for (bindex++; bindex <= bend; bindex++) | |
29606 | + if (unlikely(tgt_sb == au_sbr_sb(sb, bindex))) | |
29607 | + return bindex; | |
29608 | + return -1; | |
29609 | +} | |
29610 | + | |
29611 | +/* ---------------------------------------------------------------------- */ | |
29612 | + | |
29613 | +/* | |
29614 | + * initialize the xinofile for the specified branch @br | |
29615 | + * at the place/path where @base_file indicates. | |
29616 | + * test whether another branch is on the same filesystem or not, | |
29617 | + * if @do_test is true. | |
29618 | + */ | |
29619 | +int au_xino_br(struct super_block *sb, struct au_branch *br, ino_t h_ino, | |
29620 | + struct file *base_file, int do_test) | |
29621 | +{ | |
29622 | + int err; | |
29623 | + ino_t ino; | |
29624 | + aufs_bindex_t bend, bindex; | |
29625 | + struct au_branch *shared_br, *b; | |
29626 | + struct file *file; | |
29627 | + struct super_block *tgt_sb; | |
29628 | + | |
29629 | + shared_br = NULL; | |
29630 | + bend = au_sbend(sb); | |
29631 | + if (do_test) { | |
29632 | + tgt_sb = br->br_mnt->mnt_sb; | |
29633 | + for (bindex = 0; bindex <= bend; bindex++) { | |
29634 | + b = au_sbr(sb, bindex); | |
29635 | + if (tgt_sb == b->br_mnt->mnt_sb) { | |
29636 | + shared_br = b; | |
29637 | + break; | |
29638 | + } | |
29639 | + } | |
29640 | + } | |
29641 | + | |
29642 | + if (!shared_br || !shared_br->br_xino.xi_file) { | |
29643 | + struct au_xino_lock_dir ldir; | |
29644 | + | |
29645 | + au_xino_lock_dir(sb, base_file, &ldir); | |
29646 | + /* mnt_want_write() is unnecessary here */ | |
29647 | + file = au_xino_create2(base_file, NULL); | |
29648 | + au_xino_unlock_dir(&ldir); | |
29649 | + err = PTR_ERR(file); | |
29650 | + if (IS_ERR(file)) | |
29651 | + goto out; | |
29652 | + br->br_xino.xi_file = file; | |
29653 | + } else { | |
29654 | + br->br_xino.xi_file = shared_br->br_xino.xi_file; | |
29655 | + get_file(br->br_xino.xi_file); | |
29656 | + } | |
29657 | + | |
29658 | + ino = AUFS_ROOT_INO; | |
29659 | + err = au_xino_do_write(au_sbi(sb)->si_xwrite, br->br_xino.xi_file, | |
29660 | + h_ino, ino); | |
b752ccd1 AM |
29661 | + if (unlikely(err)) { |
29662 | + fput(br->br_xino.xi_file); | |
29663 | + br->br_xino.xi_file = NULL; | |
29664 | + } | |
1facf9fc | 29665 | + |
4f0767ce | 29666 | +out: |
1facf9fc | 29667 | + return err; |
29668 | +} | |
29669 | + | |
29670 | +/* ---------------------------------------------------------------------- */ | |
29671 | + | |
29672 | +/* trucate a xino bitmap file */ | |
29673 | + | |
29674 | +/* todo: slow */ | |
29675 | +static int do_xib_restore(struct super_block *sb, struct file *file, void *page) | |
29676 | +{ | |
29677 | + int err, bit; | |
29678 | + ssize_t sz; | |
29679 | + unsigned long pindex; | |
29680 | + loff_t pos, pend; | |
29681 | + struct au_sbinfo *sbinfo; | |
29682 | + au_readf_t func; | |
29683 | + ino_t *ino; | |
29684 | + unsigned long *p; | |
29685 | + | |
29686 | + err = 0; | |
29687 | + sbinfo = au_sbi(sb); | |
dece6358 | 29688 | + MtxMustLock(&sbinfo->si_xib_mtx); |
1facf9fc | 29689 | + p = sbinfo->si_xib_buf; |
29690 | + func = sbinfo->si_xread; | |
29691 | + pend = i_size_read(file->f_dentry->d_inode); | |
29692 | + pos = 0; | |
29693 | + while (pos < pend) { | |
29694 | + sz = xino_fread(func, file, page, PAGE_SIZE, &pos); | |
29695 | + err = sz; | |
29696 | + if (unlikely(sz <= 0)) | |
29697 | + goto out; | |
29698 | + | |
29699 | + err = 0; | |
29700 | + for (ino = page; sz > 0; ino++, sz -= sizeof(ino)) { | |
29701 | + if (unlikely(*ino < AUFS_FIRST_INO)) | |
29702 | + continue; | |
29703 | + | |
29704 | + xib_calc_bit(*ino, &pindex, &bit); | |
29705 | + AuDebugOn(page_bits <= bit); | |
29706 | + err = xib_pindex(sb, pindex); | |
29707 | + if (!err) | |
29708 | + set_bit(bit, p); | |
29709 | + else | |
29710 | + goto out; | |
29711 | + } | |
29712 | + } | |
29713 | + | |
4f0767ce | 29714 | +out: |
1facf9fc | 29715 | + return err; |
29716 | +} | |
29717 | + | |
29718 | +static int xib_restore(struct super_block *sb) | |
29719 | +{ | |
29720 | + int err; | |
29721 | + aufs_bindex_t bindex, bend; | |
29722 | + void *page; | |
29723 | + | |
29724 | + err = -ENOMEM; | |
29725 | + page = (void *)__get_free_page(GFP_NOFS); | |
29726 | + if (unlikely(!page)) | |
29727 | + goto out; | |
29728 | + | |
29729 | + err = 0; | |
29730 | + bend = au_sbend(sb); | |
29731 | + for (bindex = 0; !err && bindex <= bend; bindex++) | |
29732 | + if (!bindex || is_sb_shared(sb, bindex, bindex - 1) < 0) | |
29733 | + err = do_xib_restore | |
29734 | + (sb, au_sbr(sb, bindex)->br_xino.xi_file, page); | |
29735 | + else | |
29736 | + AuDbg("b%d\n", bindex); | |
29737 | + free_page((unsigned long)page); | |
29738 | + | |
4f0767ce | 29739 | +out: |
1facf9fc | 29740 | + return err; |
29741 | +} | |
29742 | + | |
29743 | +int au_xib_trunc(struct super_block *sb) | |
29744 | +{ | |
29745 | + int err; | |
29746 | + ssize_t sz; | |
29747 | + loff_t pos; | |
29748 | + struct au_xino_lock_dir ldir; | |
29749 | + struct au_sbinfo *sbinfo; | |
29750 | + unsigned long *p; | |
29751 | + struct file *file; | |
29752 | + | |
dece6358 AM |
29753 | + SiMustWriteLock(sb); |
29754 | + | |
1facf9fc | 29755 | + err = 0; |
29756 | + sbinfo = au_sbi(sb); | |
29757 | + if (!au_opt_test(sbinfo->si_mntflags, XINO)) | |
29758 | + goto out; | |
29759 | + | |
29760 | + file = sbinfo->si_xib; | |
29761 | + if (i_size_read(file->f_dentry->d_inode) <= PAGE_SIZE) | |
29762 | + goto out; | |
29763 | + | |
29764 | + au_xino_lock_dir(sb, file, &ldir); | |
29765 | + /* mnt_want_write() is unnecessary here */ | |
29766 | + file = au_xino_create2(sbinfo->si_xib, NULL); | |
29767 | + au_xino_unlock_dir(&ldir); | |
29768 | + err = PTR_ERR(file); | |
29769 | + if (IS_ERR(file)) | |
29770 | + goto out; | |
29771 | + fput(sbinfo->si_xib); | |
29772 | + sbinfo->si_xib = file; | |
29773 | + | |
29774 | + p = sbinfo->si_xib_buf; | |
29775 | + memset(p, 0, PAGE_SIZE); | |
29776 | + pos = 0; | |
29777 | + sz = xino_fwrite(sbinfo->si_xwrite, sbinfo->si_xib, p, PAGE_SIZE, &pos); | |
29778 | + if (unlikely(sz != PAGE_SIZE)) { | |
29779 | + err = sz; | |
29780 | + AuIOErr("err %d\n", err); | |
29781 | + if (sz >= 0) | |
29782 | + err = -EIO; | |
29783 | + goto out; | |
29784 | + } | |
29785 | + | |
29786 | + mutex_lock(&sbinfo->si_xib_mtx); | |
29787 | + /* mnt_want_write() is unnecessary here */ | |
29788 | + err = xib_restore(sb); | |
29789 | + mutex_unlock(&sbinfo->si_xib_mtx); | |
29790 | + | |
29791 | +out: | |
29792 | + return err; | |
29793 | +} | |
29794 | + | |
29795 | +/* ---------------------------------------------------------------------- */ | |
29796 | + | |
29797 | +/* | |
29798 | + * xino mount option handlers | |
29799 | + */ | |
29800 | +static au_readf_t find_readf(struct file *h_file) | |
29801 | +{ | |
29802 | + const struct file_operations *fop = h_file->f_op; | |
29803 | + | |
29804 | + if (fop) { | |
29805 | + if (fop->read) | |
29806 | + return fop->read; | |
29807 | + if (fop->aio_read) | |
29808 | + return do_sync_read; | |
29809 | + } | |
29810 | + return ERR_PTR(-ENOSYS); | |
29811 | +} | |
29812 | + | |
29813 | +static au_writef_t find_writef(struct file *h_file) | |
29814 | +{ | |
29815 | + const struct file_operations *fop = h_file->f_op; | |
29816 | + | |
29817 | + if (fop) { | |
29818 | + if (fop->write) | |
29819 | + return fop->write; | |
29820 | + if (fop->aio_write) | |
29821 | + return do_sync_write; | |
29822 | + } | |
29823 | + return ERR_PTR(-ENOSYS); | |
29824 | +} | |
29825 | + | |
29826 | +/* xino bitmap */ | |
29827 | +static void xino_clear_xib(struct super_block *sb) | |
29828 | +{ | |
29829 | + struct au_sbinfo *sbinfo; | |
29830 | + | |
dece6358 AM |
29831 | + SiMustWriteLock(sb); |
29832 | + | |
1facf9fc | 29833 | + sbinfo = au_sbi(sb); |
29834 | + sbinfo->si_xread = NULL; | |
29835 | + sbinfo->si_xwrite = NULL; | |
29836 | + if (sbinfo->si_xib) | |
29837 | + fput(sbinfo->si_xib); | |
29838 | + sbinfo->si_xib = NULL; | |
29839 | + free_page((unsigned long)sbinfo->si_xib_buf); | |
29840 | + sbinfo->si_xib_buf = NULL; | |
29841 | +} | |
29842 | + | |
29843 | +static int au_xino_set_xib(struct super_block *sb, struct file *base) | |
29844 | +{ | |
29845 | + int err; | |
29846 | + loff_t pos; | |
29847 | + struct au_sbinfo *sbinfo; | |
29848 | + struct file *file; | |
29849 | + | |
dece6358 AM |
29850 | + SiMustWriteLock(sb); |
29851 | + | |
1facf9fc | 29852 | + sbinfo = au_sbi(sb); |
29853 | + file = au_xino_create2(base, sbinfo->si_xib); | |
29854 | + err = PTR_ERR(file); | |
29855 | + if (IS_ERR(file)) | |
29856 | + goto out; | |
29857 | + if (sbinfo->si_xib) | |
29858 | + fput(sbinfo->si_xib); | |
29859 | + sbinfo->si_xib = file; | |
29860 | + sbinfo->si_xread = find_readf(file); | |
29861 | + sbinfo->si_xwrite = find_writef(file); | |
29862 | + | |
29863 | + err = -ENOMEM; | |
29864 | + if (!sbinfo->si_xib_buf) | |
29865 | + sbinfo->si_xib_buf = (void *)get_zeroed_page(GFP_NOFS); | |
29866 | + if (unlikely(!sbinfo->si_xib_buf)) | |
29867 | + goto out_unset; | |
29868 | + | |
29869 | + sbinfo->si_xib_last_pindex = 0; | |
29870 | + sbinfo->si_xib_next_bit = 0; | |
29871 | + if (i_size_read(file->f_dentry->d_inode) < PAGE_SIZE) { | |
29872 | + pos = 0; | |
29873 | + err = xino_fwrite(sbinfo->si_xwrite, file, sbinfo->si_xib_buf, | |
29874 | + PAGE_SIZE, &pos); | |
29875 | + if (unlikely(err != PAGE_SIZE)) | |
29876 | + goto out_free; | |
29877 | + } | |
29878 | + err = 0; | |
29879 | + goto out; /* success */ | |
29880 | + | |
4f0767ce | 29881 | +out_free: |
1facf9fc | 29882 | + free_page((unsigned long)sbinfo->si_xib_buf); |
b752ccd1 AM |
29883 | + sbinfo->si_xib_buf = NULL; |
29884 | + if (err >= 0) | |
29885 | + err = -EIO; | |
4f0767ce | 29886 | +out_unset: |
b752ccd1 AM |
29887 | + fput(sbinfo->si_xib); |
29888 | + sbinfo->si_xib = NULL; | |
29889 | + sbinfo->si_xread = NULL; | |
29890 | + sbinfo->si_xwrite = NULL; | |
4f0767ce | 29891 | +out: |
b752ccd1 | 29892 | + return err; |
1facf9fc | 29893 | +} |
29894 | + | |
b752ccd1 AM |
29895 | +/* xino for each branch */ |
29896 | +static void xino_clear_br(struct super_block *sb) | |
29897 | +{ | |
29898 | + aufs_bindex_t bindex, bend; | |
29899 | + struct au_branch *br; | |
1facf9fc | 29900 | + |
b752ccd1 AM |
29901 | + bend = au_sbend(sb); |
29902 | + for (bindex = 0; bindex <= bend; bindex++) { | |
29903 | + br = au_sbr(sb, bindex); | |
29904 | + if (!br || !br->br_xino.xi_file) | |
29905 | + continue; | |
29906 | + | |
29907 | + fput(br->br_xino.xi_file); | |
29908 | + br->br_xino.xi_file = NULL; | |
29909 | + } | |
29910 | +} | |
29911 | + | |
29912 | +static int au_xino_set_br(struct super_block *sb, struct file *base) | |
1facf9fc | 29913 | +{ |
29914 | + int err; | |
b752ccd1 AM |
29915 | + ino_t ino; |
29916 | + aufs_bindex_t bindex, bend, bshared; | |
29917 | + struct { | |
29918 | + struct file *old, *new; | |
29919 | + } *fpair, *p; | |
29920 | + struct au_branch *br; | |
29921 | + struct inode *inode; | |
29922 | + au_writef_t writef; | |
1facf9fc | 29923 | + |
b752ccd1 AM |
29924 | + SiMustWriteLock(sb); |
29925 | + | |
29926 | + err = -ENOMEM; | |
29927 | + bend = au_sbend(sb); | |
29928 | + fpair = kcalloc(bend + 1, sizeof(*fpair), GFP_NOFS); | |
29929 | + if (unlikely(!fpair)) | |
1facf9fc | 29930 | + goto out; |
29931 | + | |
b752ccd1 AM |
29932 | + inode = sb->s_root->d_inode; |
29933 | + ino = AUFS_ROOT_INO; | |
29934 | + writef = au_sbi(sb)->si_xwrite; | |
29935 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) { | |
29936 | + br = au_sbr(sb, bindex); | |
29937 | + bshared = is_sb_shared(sb, bindex, bindex - 1); | |
29938 | + if (bshared >= 0) { | |
29939 | + /* shared xino */ | |
29940 | + *p = fpair[bshared]; | |
29941 | + get_file(p->new); | |
29942 | + } | |
29943 | + | |
29944 | + if (!p->new) { | |
29945 | + /* new xino */ | |
29946 | + p->old = br->br_xino.xi_file; | |
29947 | + p->new = au_xino_create2(base, br->br_xino.xi_file); | |
29948 | + err = PTR_ERR(p->new); | |
29949 | + if (IS_ERR(p->new)) { | |
29950 | + p->new = NULL; | |
29951 | + goto out_pair; | |
29952 | + } | |
29953 | + } | |
29954 | + | |
29955 | + err = au_xino_do_write(writef, p->new, | |
29956 | + au_h_iptr(inode, bindex)->i_ino, ino); | |
29957 | + if (unlikely(err)) | |
29958 | + goto out_pair; | |
29959 | + } | |
29960 | + | |
29961 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) { | |
29962 | + br = au_sbr(sb, bindex); | |
29963 | + if (br->br_xino.xi_file) | |
29964 | + fput(br->br_xino.xi_file); | |
29965 | + get_file(p->new); | |
29966 | + br->br_xino.xi_file = p->new; | |
29967 | + } | |
1facf9fc | 29968 | + |
4f0767ce | 29969 | +out_pair: |
b752ccd1 AM |
29970 | + for (bindex = 0, p = fpair; bindex <= bend; bindex++, p++) |
29971 | + if (p->new) | |
29972 | + fput(p->new); | |
29973 | + else | |
29974 | + break; | |
29975 | + kfree(fpair); | |
4f0767ce | 29976 | +out: |
1facf9fc | 29977 | + return err; |
29978 | +} | |
b752ccd1 AM |
29979 | + |
29980 | +void au_xino_clr(struct super_block *sb) | |
29981 | +{ | |
29982 | + struct au_sbinfo *sbinfo; | |
29983 | + | |
29984 | + au_xigen_clr(sb); | |
29985 | + xino_clear_xib(sb); | |
29986 | + xino_clear_br(sb); | |
29987 | + sbinfo = au_sbi(sb); | |
29988 | + /* lvalue, do not call au_mntflags() */ | |
29989 | + au_opt_clr(sbinfo->si_mntflags, XINO); | |
29990 | +} | |
29991 | + | |
29992 | +int au_xino_set(struct super_block *sb, struct au_opt_xino *xino, int remount) | |
29993 | +{ | |
29994 | + int err, skip; | |
29995 | + struct dentry *parent, *cur_parent; | |
29996 | + struct qstr *dname, *cur_name; | |
29997 | + struct file *cur_xino; | |
29998 | + struct inode *dir; | |
29999 | + struct au_sbinfo *sbinfo; | |
30000 | + | |
30001 | + SiMustWriteLock(sb); | |
30002 | + | |
30003 | + err = 0; | |
30004 | + sbinfo = au_sbi(sb); | |
30005 | + parent = dget_parent(xino->file->f_dentry); | |
30006 | + if (remount) { | |
30007 | + skip = 0; | |
30008 | + dname = &xino->file->f_dentry->d_name; | |
30009 | + cur_xino = sbinfo->si_xib; | |
30010 | + if (cur_xino) { | |
30011 | + cur_parent = dget_parent(cur_xino->f_dentry); | |
30012 | + cur_name = &cur_xino->f_dentry->d_name; | |
30013 | + skip = (cur_parent == parent | |
30014 | + && dname->len == cur_name->len | |
30015 | + && !memcmp(dname->name, cur_name->name, | |
30016 | + dname->len)); | |
30017 | + dput(cur_parent); | |
30018 | + } | |
30019 | + if (skip) | |
30020 | + goto out; | |
30021 | + } | |
30022 | + | |
30023 | + au_opt_set(sbinfo->si_mntflags, XINO); | |
30024 | + dir = parent->d_inode; | |
30025 | + mutex_lock_nested(&dir->i_mutex, AuLsc_I_PARENT); | |
30026 | + /* mnt_want_write() is unnecessary here */ | |
30027 | + err = au_xino_set_xib(sb, xino->file); | |
30028 | + if (!err) | |
30029 | + err = au_xigen_set(sb, xino->file); | |
30030 | + if (!err) | |
30031 | + err = au_xino_set_br(sb, xino->file); | |
30032 | + mutex_unlock(&dir->i_mutex); | |
30033 | + if (!err) | |
30034 | + goto out; /* success */ | |
30035 | + | |
30036 | + /* reset all */ | |
30037 | + AuIOErr("failed creating xino(%d).\n", err); | |
30038 | + | |
4f0767ce | 30039 | +out: |
b752ccd1 AM |
30040 | + dput(parent); |
30041 | + return err; | |
30042 | +} | |
30043 | + | |
30044 | +/* ---------------------------------------------------------------------- */ | |
30045 | + | |
30046 | +/* | |
30047 | + * create a xinofile at the default place/path. | |
30048 | + */ | |
30049 | +struct file *au_xino_def(struct super_block *sb) | |
30050 | +{ | |
30051 | + struct file *file; | |
30052 | + char *page, *p; | |
30053 | + struct au_branch *br; | |
30054 | + struct super_block *h_sb; | |
30055 | + struct path path; | |
30056 | + aufs_bindex_t bend, bindex, bwr; | |
30057 | + | |
30058 | + br = NULL; | |
30059 | + bend = au_sbend(sb); | |
30060 | + bwr = -1; | |
30061 | + for (bindex = 0; bindex <= bend; bindex++) { | |
30062 | + br = au_sbr(sb, bindex); | |
30063 | + if (au_br_writable(br->br_perm) | |
30064 | + && !au_test_fs_bad_xino(br->br_mnt->mnt_sb)) { | |
30065 | + bwr = bindex; | |
30066 | + break; | |
30067 | + } | |
30068 | + } | |
30069 | + | |
7f207e10 AM |
30070 | + if (bwr >= 0) { |
30071 | + file = ERR_PTR(-ENOMEM); | |
30072 | + page = __getname_gfp(GFP_NOFS); | |
30073 | + if (unlikely(!page)) | |
30074 | + goto out; | |
30075 | + path.mnt = br->br_mnt; | |
30076 | + path.dentry = au_h_dptr(sb->s_root, bwr); | |
30077 | + p = d_path(&path, page, PATH_MAX - sizeof(AUFS_XINO_FNAME)); | |
30078 | + file = (void *)p; | |
30079 | + if (!IS_ERR(p)) { | |
30080 | + strcat(p, "/" AUFS_XINO_FNAME); | |
30081 | + AuDbg("%s\n", p); | |
30082 | + file = au_xino_create(sb, p, /*silent*/0); | |
30083 | + if (!IS_ERR(file)) | |
30084 | + au_xino_brid_set(sb, br->br_id); | |
30085 | + } | |
30086 | + __putname(page); | |
30087 | + } else { | |
30088 | + file = au_xino_create(sb, AUFS_XINO_DEFPATH, /*silent*/0); | |
30089 | + if (IS_ERR(file)) | |
30090 | + goto out; | |
30091 | + h_sb = file->f_dentry->d_sb; | |
30092 | + if (unlikely(au_test_fs_bad_xino(h_sb))) { | |
30093 | + pr_err("xino doesn't support %s(%s)\n", | |
30094 | + AUFS_XINO_DEFPATH, au_sbtype(h_sb)); | |
30095 | + fput(file); | |
30096 | + file = ERR_PTR(-EINVAL); | |
30097 | + } | |
30098 | + if (!IS_ERR(file)) | |
30099 | + au_xino_brid_set(sb, -1); | |
30100 | + } | |
0c5527e5 | 30101 | + |
7f207e10 AM |
30102 | +out: |
30103 | + return file; | |
30104 | +} | |
30105 | + | |
30106 | +/* ---------------------------------------------------------------------- */ | |
30107 | + | |
30108 | +int au_xino_path(struct seq_file *seq, struct file *file) | |
30109 | +{ | |
30110 | + int err; | |
30111 | + | |
30112 | + err = au_seq_path(seq, &file->f_path); | |
30113 | + if (unlikely(err < 0)) | |
30114 | + goto out; | |
30115 | + | |
30116 | + err = 0; | |
30117 | +#define Deleted "\\040(deleted)" | |
30118 | + seq->count -= sizeof(Deleted) - 1; | |
30119 | + AuDebugOn(memcmp(seq->buf + seq->count, Deleted, | |
30120 | + sizeof(Deleted) - 1)); | |
30121 | +#undef Deleted | |
30122 | + | |
30123 | +out: | |
30124 | + return err; | |
30125 | +} | |
30126 | diff -urN /usr/share/empty/include/linux/aufs_type.h linux/include/linux/aufs_type.h | |
30127 | --- /usr/share/empty/include/linux/aufs_type.h 1970-01-01 01:00:00.000000000 +0100 | |
53392da6 AM |
30128 | +++ linux/include/linux/aufs_type.h 2011-08-24 13:30:24.737979976 +0200 |
30129 | @@ -0,0 +1,211 @@ | |
7f207e10 | 30130 | +/* |
027c5e7a | 30131 | + * Copyright (C) 2005-2011 Junjiro R. Okajima |
7f207e10 AM |
30132 | + * |
30133 | + * This program, aufs is free software; you can redistribute it and/or modify | |
30134 | + * it under the terms of the GNU General Public License as published by | |
30135 | + * the Free Software Foundation; either version 2 of the License, or | |
30136 | + * (at your option) any later version. | |
30137 | + * | |
30138 | + * This program is distributed in the hope that it will be useful, | |
30139 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
30140 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
30141 | + * GNU General Public License for more details. | |
30142 | + * | |
30143 | + * You should have received a copy of the GNU General Public License | |
30144 | + * along with this program; if not, write to the Free Software | |
30145 | + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
30146 | + */ | |
30147 | + | |
30148 | +#ifndef __AUFS_TYPE_H__ | |
30149 | +#define __AUFS_TYPE_H__ | |
30150 | + | |
30151 | +#include <linux/ioctl.h> | |
30152 | +#include <linux/kernel.h> | |
30153 | +#include <linux/limits.h> | |
30154 | +#include <linux/types.h> | |
30155 | + | |
53392da6 | 30156 | +#define AUFS_VERSION "3.0-20110822" |
7f207e10 AM |
30157 | + |
30158 | +/* todo? move this to linux-2.6.19/include/magic.h */ | |
30159 | +#define AUFS_SUPER_MAGIC ('a' << 24 | 'u' << 16 | 'f' << 8 | 's') | |
30160 | + | |
30161 | +/* ---------------------------------------------------------------------- */ | |
30162 | + | |
30163 | +#ifdef CONFIG_AUFS_BRANCH_MAX_127 | |
30164 | +typedef __s8 aufs_bindex_t; | |
30165 | +#define AUFS_BRANCH_MAX 127 | |
30166 | +#else | |
30167 | +typedef __s16 aufs_bindex_t; | |
30168 | +#ifdef CONFIG_AUFS_BRANCH_MAX_511 | |
30169 | +#define AUFS_BRANCH_MAX 511 | |
30170 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_1023) | |
30171 | +#define AUFS_BRANCH_MAX 1023 | |
30172 | +#elif defined(CONFIG_AUFS_BRANCH_MAX_32767) | |
30173 | +#define AUFS_BRANCH_MAX 32767 | |
30174 | +#endif | |
30175 | +#endif | |
30176 | + | |
30177 | +#ifdef __KERNEL__ | |
30178 | +#ifndef AUFS_BRANCH_MAX | |
30179 | +#error unknown CONFIG_AUFS_BRANCH_MAX value | |
30180 | +#endif | |
30181 | +#endif /* __KERNEL__ */ | |
30182 | + | |
30183 | +/* ---------------------------------------------------------------------- */ | |
30184 | + | |
30185 | +#define AUFS_NAME "aufs" | |
30186 | +#define AUFS_FSTYPE AUFS_NAME | |
30187 | + | |
30188 | +#define AUFS_ROOT_INO 2 | |
30189 | +#define AUFS_FIRST_INO 11 | |
30190 | + | |
30191 | +#define AUFS_WH_PFX ".wh." | |
30192 | +#define AUFS_WH_PFX_LEN ((int)sizeof(AUFS_WH_PFX) - 1) | |
30193 | +#define AUFS_WH_TMP_LEN 4 | |
30194 | +/* a limit for rmdir/rename a dir */ | |
30195 | +#define AUFS_MAX_NAMELEN (NAME_MAX \ | |
30196 | + - AUFS_WH_PFX_LEN * 2 /* doubly whiteouted */\ | |
30197 | + - 1 /* dot */\ | |
30198 | + - AUFS_WH_TMP_LEN) /* hex */ | |
30199 | +#define AUFS_XINO_FNAME "." AUFS_NAME ".xino" | |
30200 | +#define AUFS_XINO_DEFPATH "/tmp/" AUFS_XINO_FNAME | |
30201 | +#define AUFS_XINO_TRUNC_INIT 64 /* blocks */ | |
30202 | +#define AUFS_XINO_TRUNC_STEP 4 /* blocks */ | |
30203 | +#define AUFS_DIRWH_DEF 3 | |
30204 | +#define AUFS_RDCACHE_DEF 10 /* seconds */ | |
027c5e7a | 30205 | +#define AUFS_RDCACHE_MAX 3600 /* seconds */ |
7f207e10 AM |
30206 | +#define AUFS_RDBLK_DEF 512 /* bytes */ |
30207 | +#define AUFS_RDHASH_DEF 32 | |
30208 | +#define AUFS_WKQ_NAME AUFS_NAME "d" | |
30209 | +#define AUFS_WKQ_PRE_NAME AUFS_WKQ_NAME "_pre" | |
027c5e7a AM |
30210 | +#define AUFS_MFS_DEF_SEC 30 /* seconds */ |
30211 | +#define AUFS_MFS_MAX_SEC 3600 /* seconds */ | |
7f207e10 AM |
30212 | +#define AUFS_PLINK_WARN 100 /* number of plinks */ |
30213 | + | |
30214 | +/* pseudo-link maintenace under /proc */ | |
30215 | +#define AUFS_PLINK_MAINT_NAME "plink_maint" | |
30216 | +#define AUFS_PLINK_MAINT_DIR "fs/" AUFS_NAME | |
30217 | +#define AUFS_PLINK_MAINT_PATH AUFS_PLINK_MAINT_DIR "/" AUFS_PLINK_MAINT_NAME | |
30218 | + | |
30219 | +#define AUFS_DIROPQ_NAME AUFS_WH_PFX ".opq" /* whiteouted doubly */ | |
30220 | +#define AUFS_WH_DIROPQ AUFS_WH_PFX AUFS_DIROPQ_NAME | |
30221 | + | |
30222 | +#define AUFS_BASE_NAME AUFS_WH_PFX AUFS_NAME | |
30223 | +#define AUFS_PLINKDIR_NAME AUFS_WH_PFX "plnk" | |
30224 | +#define AUFS_ORPHDIR_NAME AUFS_WH_PFX "orph" | |
30225 | + | |
30226 | +/* doubly whiteouted */ | |
30227 | +#define AUFS_WH_BASE AUFS_WH_PFX AUFS_BASE_NAME | |
30228 | +#define AUFS_WH_PLINKDIR AUFS_WH_PFX AUFS_PLINKDIR_NAME | |
30229 | +#define AUFS_WH_ORPHDIR AUFS_WH_PFX AUFS_ORPHDIR_NAME | |
30230 | + | |
30231 | +/* branch permission */ | |
30232 | +#define AUFS_BRPERM_RW "rw" | |
30233 | +#define AUFS_BRPERM_RO "ro" | |
30234 | +#define AUFS_BRPERM_RR "rr" | |
30235 | +#define AUFS_BRPERM_WH "wh" | |
30236 | +#define AUFS_BRPERM_NLWH "nolwh" | |
30237 | +#define AUFS_BRPERM_ROWH AUFS_BRPERM_RO "+" AUFS_BRPERM_WH | |
30238 | +#define AUFS_BRPERM_RRWH AUFS_BRPERM_RR "+" AUFS_BRPERM_WH | |
30239 | +#define AUFS_BRPERM_RWNLWH AUFS_BRPERM_RW "+" AUFS_BRPERM_NLWH | |
30240 | + | |
30241 | +/* ---------------------------------------------------------------------- */ | |
30242 | + | |
30243 | +/* ioctl */ | |
30244 | +enum { | |
30245 | + /* readdir in userspace */ | |
30246 | + AuCtl_RDU, | |
30247 | + AuCtl_RDU_INO, | |
30248 | + | |
30249 | + /* pathconf wrapper */ | |
027c5e7a AM |
30250 | + AuCtl_WBR_FD, |
30251 | + | |
30252 | + /* busy inode */ | |
30253 | + AuCtl_IBUSY | |
7f207e10 AM |
30254 | +}; |
30255 | + | |
30256 | +/* borrowed from linux/include/linux/kernel.h */ | |
30257 | +#ifndef ALIGN | |
30258 | +#define ALIGN(x, a) __ALIGN_MASK(x, (typeof(x))(a)-1) | |
30259 | +#define __ALIGN_MASK(x, mask) (((x)+(mask))&~(mask)) | |
30260 | +#endif | |
30261 | + | |
30262 | +/* borrowed from linux/include/linux/compiler-gcc3.h */ | |
30263 | +#ifndef __aligned | |
30264 | +#define __aligned(x) __attribute__((aligned(x))) | |
53392da6 AM |
30265 | +#endif |
30266 | + | |
30267 | +#ifdef __KERNEL__ | |
30268 | +#ifndef __packed | |
7f207e10 AM |
30269 | +#define __packed __attribute__((packed)) |
30270 | +#endif | |
53392da6 | 30271 | +#endif |
7f207e10 AM |
30272 | + |
30273 | +struct au_rdu_cookie { | |
30274 | + __u64 h_pos; | |
30275 | + __s16 bindex; | |
30276 | + __u8 flags; | |
30277 | + __u8 pad; | |
30278 | + __u32 generation; | |
30279 | +} __aligned(8); | |
30280 | + | |
30281 | +struct au_rdu_ent { | |
30282 | + __u64 ino; | |
30283 | + __s16 bindex; | |
30284 | + __u8 type; | |
30285 | + __u8 nlen; | |
30286 | + __u8 wh; | |
30287 | + char name[0]; | |
30288 | +} __aligned(8); | |
30289 | + | |
30290 | +static inline int au_rdu_len(int nlen) | |
30291 | +{ | |
30292 | + /* include the terminating NULL */ | |
30293 | + return ALIGN(sizeof(struct au_rdu_ent) + nlen + 1, | |
30294 | + sizeof(__u64)); | |
30295 | +} | |
30296 | + | |
30297 | +union au_rdu_ent_ul { | |
30298 | + struct au_rdu_ent __user *e; | |
30299 | + __u64 ul; | |
30300 | +}; | |
30301 | + | |
30302 | +enum { | |
30303 | + AufsCtlRduV_SZ, | |
30304 | + AufsCtlRduV_End | |
30305 | +}; | |
30306 | + | |
30307 | +struct aufs_rdu { | |
30308 | + /* input */ | |
30309 | + union { | |
30310 | + __u64 sz; /* AuCtl_RDU */ | |
30311 | + __u64 nent; /* AuCtl_RDU_INO */ | |
30312 | + }; | |
30313 | + union au_rdu_ent_ul ent; | |
30314 | + __u16 verify[AufsCtlRduV_End]; | |
30315 | + | |
30316 | + /* input/output */ | |
30317 | + __u32 blk; | |
30318 | + | |
30319 | + /* output */ | |
30320 | + union au_rdu_ent_ul tail; | |
30321 | + /* number of entries which were added in a single call */ | |
30322 | + __u64 rent; | |
30323 | + __u8 full; | |
30324 | + __u8 shwh; | |
30325 | + | |
30326 | + struct au_rdu_cookie cookie; | |
30327 | +} __aligned(8); | |
30328 | + | |
027c5e7a AM |
30329 | +struct aufs_ibusy { |
30330 | + __u64 ino, h_ino; | |
30331 | + __s16 bindex; | |
30332 | +} __aligned(8); | |
30333 | + | |
7f207e10 AM |
30334 | +#define AuCtlType 'A' |
30335 | +#define AUFS_CTL_RDU _IOWR(AuCtlType, AuCtl_RDU, struct aufs_rdu) | |
30336 | +#define AUFS_CTL_RDU_INO _IOWR(AuCtlType, AuCtl_RDU_INO, struct aufs_rdu) | |
30337 | +#define AUFS_CTL_WBR_FD _IO(AuCtlType, AuCtl_WBR_FD) | |
027c5e7a | 30338 | +#define AUFS_CTL_IBUSY _IOWR(AuCtlType, AuCtl_IBUSY, struct aufs_ibusy) |
7f207e10 AM |
30339 | + |
30340 | +#endif /* __AUFS_TYPE_H__ */ | |
87a755f4 | 30341 |