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Commit | Line | Data |
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e9be9d5e MS |
1 | /* |
2 | * | |
3 | * Copyright (C) 2011 Novell Inc. | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | */ | |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/namei.h> | |
12 | #include <linux/xattr.h> | |
13 | #include <linux/security.h> | |
14 | #include <linux/cred.h> | |
3ea22a71 | 15 | #include <linux/module.h> |
38b25697 MS |
16 | #include <linux/posix_acl.h> |
17 | #include <linux/posix_acl_xattr.h> | |
6a45b362 | 18 | #include <linux/atomic.h> |
a6c60655 | 19 | #include <linux/ratelimit.h> |
e9be9d5e MS |
20 | #include "overlayfs.h" |
21 | ||
3ea22a71 MS |
22 | static unsigned short ovl_redirect_max = 256; |
23 | module_param_named(redirect_max, ovl_redirect_max, ushort, 0644); | |
24 | MODULE_PARM_DESC(ovl_redirect_max, | |
25 | "Maximum length of absolute redirect xattr value"); | |
26 | ||
e9be9d5e MS |
27 | void ovl_cleanup(struct inode *wdir, struct dentry *wdentry) |
28 | { | |
29 | int err; | |
30 | ||
31 | dget(wdentry); | |
e36cb0b8 | 32 | if (d_is_dir(wdentry)) |
e9be9d5e MS |
33 | err = ovl_do_rmdir(wdir, wdentry); |
34 | else | |
35 | err = ovl_do_unlink(wdir, wdentry); | |
36 | dput(wdentry); | |
37 | ||
38 | if (err) { | |
39 | pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n", | |
40 | wdentry, err); | |
41 | } | |
42 | } | |
43 | ||
3d27573c | 44 | struct dentry *ovl_lookup_temp(struct dentry *workdir) |
e9be9d5e MS |
45 | { |
46 | struct dentry *temp; | |
47 | char name[20]; | |
6a45b362 | 48 | static atomic_t temp_id = ATOMIC_INIT(0); |
e9be9d5e | 49 | |
6a45b362 RW |
50 | /* counter is allowed to wrap, since temp dentries are ephemeral */ |
51 | snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id)); | |
e9be9d5e MS |
52 | |
53 | temp = lookup_one_len(name, workdir, strlen(name)); | |
54 | if (!IS_ERR(temp) && temp->d_inode) { | |
55 | pr_err("overlayfs: workdir/%s already exists\n", name); | |
56 | dput(temp); | |
57 | temp = ERR_PTR(-EIO); | |
58 | } | |
59 | ||
60 | return temp; | |
61 | } | |
62 | ||
63 | /* caller holds i_mutex on workdir */ | |
64 | static struct dentry *ovl_whiteout(struct dentry *workdir, | |
65 | struct dentry *dentry) | |
66 | { | |
67 | int err; | |
68 | struct dentry *whiteout; | |
69 | struct inode *wdir = workdir->d_inode; | |
70 | ||
3d27573c | 71 | whiteout = ovl_lookup_temp(workdir); |
e9be9d5e MS |
72 | if (IS_ERR(whiteout)) |
73 | return whiteout; | |
74 | ||
75 | err = ovl_do_whiteout(wdir, whiteout); | |
76 | if (err) { | |
77 | dput(whiteout); | |
78 | whiteout = ERR_PTR(err); | |
79 | } | |
80 | ||
81 | return whiteout; | |
82 | } | |
83 | ||
84 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, | |
32a3d848 | 85 | struct cattr *attr, struct dentry *hardlink, bool debug) |
e9be9d5e MS |
86 | { |
87 | int err; | |
88 | ||
89 | if (newdentry->d_inode) | |
90 | return -ESTALE; | |
91 | ||
92 | if (hardlink) { | |
93 | err = ovl_do_link(hardlink, dir, newdentry, debug); | |
94 | } else { | |
32a3d848 | 95 | switch (attr->mode & S_IFMT) { |
e9be9d5e | 96 | case S_IFREG: |
32a3d848 | 97 | err = ovl_do_create(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
98 | break; |
99 | ||
100 | case S_IFDIR: | |
32a3d848 | 101 | err = ovl_do_mkdir(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
102 | break; |
103 | ||
104 | case S_IFCHR: | |
105 | case S_IFBLK: | |
106 | case S_IFIFO: | |
107 | case S_IFSOCK: | |
108 | err = ovl_do_mknod(dir, newdentry, | |
32a3d848 | 109 | attr->mode, attr->rdev, debug); |
e9be9d5e MS |
110 | break; |
111 | ||
112 | case S_IFLNK: | |
32a3d848 | 113 | err = ovl_do_symlink(dir, newdentry, attr->link, debug); |
e9be9d5e MS |
114 | break; |
115 | ||
116 | default: | |
117 | err = -EPERM; | |
118 | } | |
119 | } | |
120 | if (!err && WARN_ON(!newdentry->d_inode)) { | |
121 | /* | |
122 | * Not quite sure if non-instantiated dentry is legal or not. | |
123 | * VFS doesn't seem to care so check and warn here. | |
124 | */ | |
125 | err = -ENOENT; | |
126 | } | |
127 | return err; | |
128 | } | |
129 | ||
21a22878 AG |
130 | static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, |
131 | int xerr) | |
e9be9d5e | 132 | { |
5cf5b477 MS |
133 | int err; |
134 | ||
21a22878 | 135 | err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr); |
5cf5b477 MS |
136 | if (!err) |
137 | ovl_dentry_set_opaque(dentry); | |
138 | ||
139 | return err; | |
e9be9d5e MS |
140 | } |
141 | ||
21a22878 AG |
142 | static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry) |
143 | { | |
144 | /* | |
145 | * Fail with -EIO when trying to create opaque dir and upper doesn't | |
146 | * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to | |
147 | * return a specific error for noxattr case. | |
148 | */ | |
149 | return ovl_set_opaque_xerr(dentry, upperdentry, -EIO); | |
150 | } | |
151 | ||
ee1d6d37 AG |
152 | static int ovl_set_impure(struct dentry *dentry, struct dentry *upperdentry) |
153 | { | |
154 | int err; | |
155 | ||
156 | /* | |
157 | * Do not fail when upper doesn't support xattrs. | |
158 | * Upper inodes won't have origin nor redirect xattr anyway. | |
159 | */ | |
160 | err = ovl_check_setxattr(dentry, upperdentry, OVL_XATTR_IMPURE, | |
161 | "y", 1, 0); | |
162 | if (!err) | |
163 | ovl_dentry_set_impure(dentry); | |
164 | ||
165 | return err; | |
166 | } | |
167 | ||
72e48481 VG |
168 | /* Common operations required to be done after creation of file on upper */ |
169 | static void ovl_instantiate(struct dentry *dentry, struct inode *inode, | |
51f7e52d | 170 | struct dentry *newdentry, bool hardlink) |
72e48481 VG |
171 | { |
172 | ovl_dentry_version_inc(dentry->d_parent); | |
173 | ovl_dentry_update(dentry, newdentry); | |
51f7e52d MS |
174 | if (!hardlink) { |
175 | ovl_inode_update(inode, d_inode(newdentry)); | |
176 | ovl_copyattr(newdentry->d_inode, inode); | |
177 | } else { | |
178 | WARN_ON(ovl_inode_real(inode, NULL) != d_inode(newdentry)); | |
179 | inc_nlink(inode); | |
180 | } | |
72e48481 | 181 | d_instantiate(dentry, inode); |
5b6c9053 AG |
182 | /* Force lookup of new upper hardlink to find its lower */ |
183 | if (hardlink) | |
184 | d_drop(dentry); | |
72e48481 VG |
185 | } |
186 | ||
97c684cc AG |
187 | static bool ovl_type_merge(struct dentry *dentry) |
188 | { | |
189 | return OVL_TYPE_MERGE(ovl_path_type(dentry)); | |
190 | } | |
191 | ||
ee1d6d37 AG |
192 | static bool ovl_type_origin(struct dentry *dentry) |
193 | { | |
194 | return OVL_TYPE_ORIGIN(ovl_path_type(dentry)); | |
195 | } | |
196 | ||
e9be9d5e | 197 | static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
32a3d848 | 198 | struct cattr *attr, struct dentry *hardlink) |
e9be9d5e MS |
199 | { |
200 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
201 | struct inode *udir = upperdir->d_inode; | |
202 | struct dentry *newdentry; | |
203 | int err; | |
204 | ||
38b25697 | 205 | if (!hardlink && !IS_POSIXACL(udir)) |
32a3d848 | 206 | attr->mode &= ~current_umask(); |
38b25697 | 207 | |
5955102c | 208 | inode_lock_nested(udir, I_MUTEX_PARENT); |
e9be9d5e MS |
209 | newdentry = lookup_one_len(dentry->d_name.name, upperdir, |
210 | dentry->d_name.len); | |
211 | err = PTR_ERR(newdentry); | |
212 | if (IS_ERR(newdentry)) | |
213 | goto out_unlock; | |
32a3d848 | 214 | err = ovl_create_real(udir, newdentry, attr, hardlink, false); |
e9be9d5e MS |
215 | if (err) |
216 | goto out_dput; | |
217 | ||
4a99f3c8 | 218 | if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
97c684cc AG |
219 | /* Setting opaque here is just an optimization, allow to fail */ |
220 | ovl_set_opaque(dentry, newdentry); | |
221 | } | |
222 | ||
51f7e52d | 223 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
224 | newdentry = NULL; |
225 | out_dput: | |
226 | dput(newdentry); | |
227 | out_unlock: | |
5955102c | 228 | inode_unlock(udir); |
e9be9d5e MS |
229 | return err; |
230 | } | |
231 | ||
232 | static int ovl_lock_rename_workdir(struct dentry *workdir, | |
233 | struct dentry *upperdir) | |
234 | { | |
235 | /* Workdir should not be the same as upperdir */ | |
236 | if (workdir == upperdir) | |
237 | goto err; | |
238 | ||
239 | /* Workdir should not be subdir of upperdir and vice versa */ | |
240 | if (lock_rename(workdir, upperdir) != NULL) | |
241 | goto err_unlock; | |
242 | ||
243 | return 0; | |
244 | ||
245 | err_unlock: | |
246 | unlock_rename(workdir, upperdir); | |
247 | err: | |
248 | pr_err("overlayfs: failed to lock workdir+upperdir\n"); | |
249 | return -EIO; | |
250 | } | |
251 | ||
252 | static struct dentry *ovl_clear_empty(struct dentry *dentry, | |
253 | struct list_head *list) | |
254 | { | |
255 | struct dentry *workdir = ovl_workdir(dentry); | |
256 | struct inode *wdir = workdir->d_inode; | |
257 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
258 | struct inode *udir = upperdir->d_inode; | |
259 | struct path upperpath; | |
260 | struct dentry *upper; | |
261 | struct dentry *opaquedir; | |
262 | struct kstat stat; | |
263 | int err; | |
264 | ||
cc6f67bc MS |
265 | if (WARN_ON(!workdir)) |
266 | return ERR_PTR(-EROFS); | |
267 | ||
e9be9d5e MS |
268 | err = ovl_lock_rename_workdir(workdir, upperdir); |
269 | if (err) | |
270 | goto out; | |
271 | ||
272 | ovl_path_upper(dentry, &upperpath); | |
a528d35e DH |
273 | err = vfs_getattr(&upperpath, &stat, |
274 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
275 | if (err) |
276 | goto out_unlock; | |
277 | ||
278 | err = -ESTALE; | |
279 | if (!S_ISDIR(stat.mode)) | |
280 | goto out_unlock; | |
281 | upper = upperpath.dentry; | |
282 | if (upper->d_parent->d_inode != udir) | |
283 | goto out_unlock; | |
284 | ||
3d27573c | 285 | opaquedir = ovl_lookup_temp(workdir); |
e9be9d5e MS |
286 | err = PTR_ERR(opaquedir); |
287 | if (IS_ERR(opaquedir)) | |
288 | goto out_unlock; | |
289 | ||
32a3d848 AV |
290 | err = ovl_create_real(wdir, opaquedir, |
291 | &(struct cattr){.mode = stat.mode}, NULL, true); | |
e9be9d5e MS |
292 | if (err) |
293 | goto out_dput; | |
294 | ||
295 | err = ovl_copy_xattr(upper, opaquedir); | |
296 | if (err) | |
297 | goto out_cleanup; | |
298 | ||
5cf5b477 | 299 | err = ovl_set_opaque(dentry, opaquedir); |
e9be9d5e MS |
300 | if (err) |
301 | goto out_cleanup; | |
302 | ||
5955102c | 303 | inode_lock(opaquedir->d_inode); |
e9be9d5e | 304 | err = ovl_set_attr(opaquedir, &stat); |
5955102c | 305 | inode_unlock(opaquedir->d_inode); |
e9be9d5e MS |
306 | if (err) |
307 | goto out_cleanup; | |
308 | ||
309 | err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); | |
310 | if (err) | |
311 | goto out_cleanup; | |
312 | ||
313 | ovl_cleanup_whiteouts(upper, list); | |
314 | ovl_cleanup(wdir, upper); | |
315 | unlock_rename(workdir, upperdir); | |
316 | ||
317 | /* dentry's upper doesn't match now, get rid of it */ | |
318 | d_drop(dentry); | |
319 | ||
320 | return opaquedir; | |
321 | ||
322 | out_cleanup: | |
323 | ovl_cleanup(wdir, opaquedir); | |
324 | out_dput: | |
325 | dput(opaquedir); | |
326 | out_unlock: | |
327 | unlock_rename(workdir, upperdir); | |
328 | out: | |
329 | return ERR_PTR(err); | |
330 | } | |
331 | ||
a105d685 | 332 | static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry) |
e9be9d5e MS |
333 | { |
334 | int err; | |
335 | struct dentry *ret = NULL; | |
30c17ebf | 336 | enum ovl_path_type type = ovl_path_type(dentry); |
e9be9d5e MS |
337 | LIST_HEAD(list); |
338 | ||
339 | err = ovl_check_empty_dir(dentry, &list); | |
30c17ebf | 340 | if (err) { |
e9be9d5e | 341 | ret = ERR_PTR(err); |
30c17ebf | 342 | goto out_free; |
a105d685 | 343 | } |
e9be9d5e | 344 | |
30c17ebf MS |
345 | /* |
346 | * When removing an empty opaque directory, then it makes no sense to | |
347 | * replace it with an exact replica of itself. | |
348 | * | |
349 | * If no upperdentry then skip clearing whiteouts. | |
350 | * | |
351 | * Can race with copy-up, since we don't hold the upperdir mutex. | |
352 | * Doesn't matter, since copy-up can't create a non-empty directory | |
353 | * from an empty one. | |
354 | */ | |
355 | if (OVL_TYPE_UPPER(type) && OVL_TYPE_MERGE(type)) | |
356 | ret = ovl_clear_empty(dentry, &list); | |
357 | ||
358 | out_free: | |
e9be9d5e MS |
359 | ovl_cache_free(&list); |
360 | ||
361 | return ret; | |
362 | } | |
363 | ||
38b25697 MS |
364 | static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, |
365 | const struct posix_acl *acl) | |
366 | { | |
367 | void *buffer; | |
368 | size_t size; | |
369 | int err; | |
370 | ||
371 | if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) | |
372 | return 0; | |
373 | ||
374 | size = posix_acl_to_xattr(NULL, acl, NULL, 0); | |
375 | buffer = kmalloc(size, GFP_KERNEL); | |
376 | if (!buffer) | |
377 | return -ENOMEM; | |
378 | ||
379 | size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
380 | err = size; | |
381 | if (err < 0) | |
382 | goto out_free; | |
383 | ||
384 | err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); | |
385 | out_free: | |
386 | kfree(buffer); | |
387 | return err; | |
388 | } | |
389 | ||
e9be9d5e | 390 | static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
32a3d848 | 391 | struct cattr *cattr, |
e9be9d5e MS |
392 | struct dentry *hardlink) |
393 | { | |
394 | struct dentry *workdir = ovl_workdir(dentry); | |
395 | struct inode *wdir = workdir->d_inode; | |
396 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
397 | struct inode *udir = upperdir->d_inode; | |
398 | struct dentry *upper; | |
399 | struct dentry *newdentry; | |
400 | int err; | |
38b25697 | 401 | struct posix_acl *acl, *default_acl; |
e9be9d5e | 402 | |
cc6f67bc MS |
403 | if (WARN_ON(!workdir)) |
404 | return -EROFS; | |
405 | ||
38b25697 MS |
406 | if (!hardlink) { |
407 | err = posix_acl_create(dentry->d_parent->d_inode, | |
32a3d848 | 408 | &cattr->mode, &default_acl, &acl); |
38b25697 MS |
409 | if (err) |
410 | return err; | |
411 | } | |
412 | ||
e9be9d5e MS |
413 | err = ovl_lock_rename_workdir(workdir, upperdir); |
414 | if (err) | |
415 | goto out; | |
416 | ||
3d27573c | 417 | newdentry = ovl_lookup_temp(workdir); |
e9be9d5e MS |
418 | err = PTR_ERR(newdentry); |
419 | if (IS_ERR(newdentry)) | |
420 | goto out_unlock; | |
421 | ||
422 | upper = lookup_one_len(dentry->d_name.name, upperdir, | |
423 | dentry->d_name.len); | |
424 | err = PTR_ERR(upper); | |
425 | if (IS_ERR(upper)) | |
426 | goto out_dput; | |
427 | ||
32a3d848 | 428 | err = ovl_create_real(wdir, newdentry, cattr, hardlink, true); |
e9be9d5e MS |
429 | if (err) |
430 | goto out_dput2; | |
431 | ||
bb0d2b8a MS |
432 | /* |
433 | * mode could have been mutilated due to umask (e.g. sgid directory) | |
434 | */ | |
51f7e52d | 435 | if (!hardlink && |
32a3d848 AV |
436 | !S_ISLNK(cattr->mode) && |
437 | newdentry->d_inode->i_mode != cattr->mode) { | |
bb0d2b8a MS |
438 | struct iattr attr = { |
439 | .ia_valid = ATTR_MODE, | |
32a3d848 | 440 | .ia_mode = cattr->mode, |
bb0d2b8a MS |
441 | }; |
442 | inode_lock(newdentry->d_inode); | |
443 | err = notify_change(newdentry, &attr, NULL); | |
444 | inode_unlock(newdentry->d_inode); | |
445 | if (err) | |
446 | goto out_cleanup; | |
447 | } | |
38b25697 MS |
448 | if (!hardlink) { |
449 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, | |
450 | acl); | |
451 | if (err) | |
452 | goto out_cleanup; | |
453 | ||
454 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, | |
455 | default_acl); | |
456 | if (err) | |
457 | goto out_cleanup; | |
458 | } | |
bb0d2b8a | 459 | |
32a3d848 | 460 | if (!hardlink && S_ISDIR(cattr->mode)) { |
5cf5b477 | 461 | err = ovl_set_opaque(dentry, newdentry); |
e9be9d5e MS |
462 | if (err) |
463 | goto out_cleanup; | |
464 | ||
465 | err = ovl_do_rename(wdir, newdentry, udir, upper, | |
466 | RENAME_EXCHANGE); | |
467 | if (err) | |
468 | goto out_cleanup; | |
469 | ||
470 | ovl_cleanup(wdir, upper); | |
471 | } else { | |
472 | err = ovl_do_rename(wdir, newdentry, udir, upper, 0); | |
473 | if (err) | |
474 | goto out_cleanup; | |
475 | } | |
51f7e52d | 476 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
477 | newdentry = NULL; |
478 | out_dput2: | |
479 | dput(upper); | |
480 | out_dput: | |
481 | dput(newdentry); | |
482 | out_unlock: | |
483 | unlock_rename(workdir, upperdir); | |
484 | out: | |
38b25697 MS |
485 | if (!hardlink) { |
486 | posix_acl_release(acl); | |
487 | posix_acl_release(default_acl); | |
488 | } | |
e9be9d5e MS |
489 | return err; |
490 | ||
491 | out_cleanup: | |
492 | ovl_cleanup(wdir, newdentry); | |
493 | goto out_dput2; | |
494 | } | |
495 | ||
51f7e52d | 496 | static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
32a3d848 | 497 | struct cattr *attr, struct dentry *hardlink) |
e9be9d5e MS |
498 | { |
499 | int err; | |
1175b6b8 VG |
500 | const struct cred *old_cred; |
501 | struct cred *override_cred; | |
e9be9d5e MS |
502 | |
503 | err = ovl_copy_up(dentry->d_parent); | |
504 | if (err) | |
51f7e52d | 505 | return err; |
bb0d2b8a | 506 | |
1175b6b8 VG |
507 | old_cred = ovl_override_creds(dentry->d_sb); |
508 | err = -ENOMEM; | |
509 | override_cred = prepare_creds(); | |
510 | if (override_cred) { | |
bb0d2b8a MS |
511 | override_cred->fsuid = inode->i_uid; |
512 | override_cred->fsgid = inode->i_gid; | |
2602625b VG |
513 | if (!hardlink) { |
514 | err = security_dentry_create_files_as(dentry, | |
32a3d848 | 515 | attr->mode, &dentry->d_name, old_cred, |
2602625b VG |
516 | override_cred); |
517 | if (err) { | |
518 | put_cred(override_cred); | |
519 | goto out_revert_creds; | |
520 | } | |
521 | } | |
1175b6b8 VG |
522 | put_cred(override_creds(override_cred)); |
523 | put_cred(override_cred); | |
524 | ||
c412ce49 | 525 | if (!ovl_dentry_is_whiteout(dentry)) |
32a3d848 | 526 | err = ovl_create_upper(dentry, inode, attr, |
1175b6b8 VG |
527 | hardlink); |
528 | else | |
32a3d848 AV |
529 | err = ovl_create_over_whiteout(dentry, inode, attr, |
530 | hardlink); | |
e9be9d5e | 531 | } |
2602625b | 532 | out_revert_creds: |
1175b6b8 | 533 | revert_creds(old_cred); |
bb0d2b8a MS |
534 | if (!err) { |
535 | struct inode *realinode = d_inode(ovl_dentry_upper(dentry)); | |
536 | ||
537 | WARN_ON(inode->i_mode != realinode->i_mode); | |
538 | WARN_ON(!uid_eq(inode->i_uid, realinode->i_uid)); | |
539 | WARN_ON(!gid_eq(inode->i_gid, realinode->i_gid)); | |
bb0d2b8a | 540 | } |
e9be9d5e MS |
541 | return err; |
542 | } | |
543 | ||
544 | static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev, | |
545 | const char *link) | |
546 | { | |
547 | int err; | |
51f7e52d | 548 | struct inode *inode; |
32a3d848 | 549 | struct cattr attr = { |
51f7e52d | 550 | .rdev = rdev, |
32a3d848 | 551 | .link = link, |
51f7e52d | 552 | }; |
e9be9d5e MS |
553 | |
554 | err = ovl_want_write(dentry); | |
51f7e52d MS |
555 | if (err) |
556 | goto out; | |
557 | ||
558 | err = -ENOMEM; | |
ca4c8a3a | 559 | inode = ovl_new_inode(dentry->d_sb, mode, rdev); |
51f7e52d MS |
560 | if (!inode) |
561 | goto out_drop_write; | |
562 | ||
563 | inode_init_owner(inode, dentry->d_parent->d_inode, mode); | |
32a3d848 | 564 | attr.mode = inode->i_mode; |
51f7e52d | 565 | |
32a3d848 | 566 | err = ovl_create_or_link(dentry, inode, &attr, NULL); |
51f7e52d MS |
567 | if (err) |
568 | iput(inode); | |
e9be9d5e | 569 | |
51f7e52d MS |
570 | out_drop_write: |
571 | ovl_drop_write(dentry); | |
572 | out: | |
e9be9d5e MS |
573 | return err; |
574 | } | |
575 | ||
576 | static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
577 | bool excl) | |
578 | { | |
579 | return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL); | |
580 | } | |
581 | ||
582 | static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
583 | { | |
584 | return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL); | |
585 | } | |
586 | ||
587 | static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, | |
588 | dev_t rdev) | |
589 | { | |
590 | /* Don't allow creation of "whiteout" on overlay */ | |
591 | if (S_ISCHR(mode) && rdev == WHITEOUT_DEV) | |
592 | return -EPERM; | |
593 | ||
594 | return ovl_create_object(dentry, mode, rdev, NULL); | |
595 | } | |
596 | ||
597 | static int ovl_symlink(struct inode *dir, struct dentry *dentry, | |
598 | const char *link) | |
599 | { | |
600 | return ovl_create_object(dentry, S_IFLNK, 0, link); | |
601 | } | |
602 | ||
603 | static int ovl_link(struct dentry *old, struct inode *newdir, | |
604 | struct dentry *new) | |
605 | { | |
606 | int err; | |
51f7e52d | 607 | struct inode *inode; |
e9be9d5e MS |
608 | |
609 | err = ovl_want_write(old); | |
610 | if (err) | |
611 | goto out; | |
612 | ||
613 | err = ovl_copy_up(old); | |
614 | if (err) | |
615 | goto out_drop_write; | |
616 | ||
51f7e52d MS |
617 | inode = d_inode(old); |
618 | ihold(inode); | |
619 | ||
32a3d848 | 620 | err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old)); |
51f7e52d MS |
621 | if (err) |
622 | iput(inode); | |
e9be9d5e MS |
623 | |
624 | out_drop_write: | |
625 | ovl_drop_write(old); | |
626 | out: | |
627 | return err; | |
628 | } | |
629 | ||
a105d685 | 630 | static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir) |
e9be9d5e MS |
631 | { |
632 | struct dentry *workdir = ovl_workdir(dentry); | |
633 | struct inode *wdir = workdir->d_inode; | |
634 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
635 | struct inode *udir = upperdir->d_inode; | |
636 | struct dentry *whiteout; | |
637 | struct dentry *upper; | |
638 | struct dentry *opaquedir = NULL; | |
639 | int err; | |
cfc9fde0 | 640 | int flags = 0; |
e9be9d5e | 641 | |
cc6f67bc MS |
642 | if (WARN_ON(!workdir)) |
643 | return -EROFS; | |
644 | ||
d377c5eb | 645 | if (is_dir) { |
30c17ebf MS |
646 | opaquedir = ovl_check_empty_and_clear(dentry); |
647 | err = PTR_ERR(opaquedir); | |
648 | if (IS_ERR(opaquedir)) | |
649 | goto out; | |
e9be9d5e MS |
650 | } |
651 | ||
652 | err = ovl_lock_rename_workdir(workdir, upperdir); | |
653 | if (err) | |
654 | goto out_dput; | |
655 | ||
cfc9fde0 MP |
656 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
657 | dentry->d_name.len); | |
658 | err = PTR_ERR(upper); | |
659 | if (IS_ERR(upper)) | |
e9be9d5e MS |
660 | goto out_unlock; |
661 | ||
cfc9fde0 MP |
662 | err = -ESTALE; |
663 | if ((opaquedir && upper != opaquedir) || | |
664 | (!opaquedir && ovl_dentry_upper(dentry) && | |
665 | upper != ovl_dentry_upper(dentry))) { | |
666 | goto out_dput_upper; | |
667 | } | |
e9be9d5e | 668 | |
cfc9fde0 MP |
669 | whiteout = ovl_whiteout(workdir, dentry); |
670 | err = PTR_ERR(whiteout); | |
671 | if (IS_ERR(whiteout)) | |
672 | goto out_dput_upper; | |
e9be9d5e | 673 | |
cfc9fde0 MP |
674 | if (d_is_dir(upper)) |
675 | flags = RENAME_EXCHANGE; | |
e9be9d5e | 676 | |
cfc9fde0 MP |
677 | err = ovl_do_rename(wdir, whiteout, udir, upper, flags); |
678 | if (err) | |
679 | goto kill_whiteout; | |
680 | if (flags) | |
681 | ovl_cleanup(wdir, upper); | |
e9be9d5e | 682 | |
e9be9d5e MS |
683 | ovl_dentry_version_inc(dentry->d_parent); |
684 | out_d_drop: | |
685 | d_drop(dentry); | |
686 | dput(whiteout); | |
cfc9fde0 MP |
687 | out_dput_upper: |
688 | dput(upper); | |
e9be9d5e MS |
689 | out_unlock: |
690 | unlock_rename(workdir, upperdir); | |
691 | out_dput: | |
692 | dput(opaquedir); | |
693 | out: | |
694 | return err; | |
695 | ||
696 | kill_whiteout: | |
697 | ovl_cleanup(wdir, whiteout); | |
698 | goto out_d_drop; | |
699 | } | |
700 | ||
701 | static int ovl_remove_upper(struct dentry *dentry, bool is_dir) | |
702 | { | |
703 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
704 | struct inode *dir = upperdir->d_inode; | |
11f37104 | 705 | struct dentry *upper; |
d1595119 | 706 | struct dentry *opaquedir = NULL; |
e9be9d5e MS |
707 | int err; |
708 | ||
d1595119 AG |
709 | /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */ |
710 | if (is_dir && ovl_dentry_get_redirect(dentry)) { | |
711 | opaquedir = ovl_check_empty_and_clear(dentry); | |
712 | err = PTR_ERR(opaquedir); | |
713 | if (IS_ERR(opaquedir)) | |
714 | goto out; | |
715 | } | |
716 | ||
5955102c | 717 | inode_lock_nested(dir, I_MUTEX_PARENT); |
11f37104 MS |
718 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
719 | dentry->d_name.len); | |
720 | err = PTR_ERR(upper); | |
721 | if (IS_ERR(upper)) | |
722 | goto out_unlock; | |
723 | ||
e9be9d5e | 724 | err = -ESTALE; |
d1595119 AG |
725 | if ((opaquedir && upper != opaquedir) || |
726 | (!opaquedir && upper != ovl_dentry_upper(dentry))) | |
727 | goto out_dput_upper; | |
728 | ||
729 | if (is_dir) | |
730 | err = vfs_rmdir(dir, upper); | |
731 | else | |
732 | err = vfs_unlink(dir, upper, NULL); | |
733 | ovl_dentry_version_inc(dentry->d_parent); | |
e9be9d5e MS |
734 | |
735 | /* | |
736 | * Keeping this dentry hashed would mean having to release | |
737 | * upperpath/lowerpath, which could only be done if we are the | |
738 | * sole user of this dentry. Too tricky... Just unhash for | |
739 | * now. | |
740 | */ | |
ce9113bb RW |
741 | if (!err) |
742 | d_drop(dentry); | |
d1595119 AG |
743 | out_dput_upper: |
744 | dput(upper); | |
11f37104 | 745 | out_unlock: |
5955102c | 746 | inode_unlock(dir); |
d1595119 AG |
747 | dput(opaquedir); |
748 | out: | |
e9be9d5e MS |
749 | return err; |
750 | } | |
751 | ||
e9be9d5e MS |
752 | static int ovl_do_remove(struct dentry *dentry, bool is_dir) |
753 | { | |
754 | enum ovl_path_type type; | |
755 | int err; | |
1175b6b8 VG |
756 | const struct cred *old_cred; |
757 | ||
e9be9d5e MS |
758 | err = ovl_want_write(dentry); |
759 | if (err) | |
760 | goto out; | |
761 | ||
762 | err = ovl_copy_up(dentry->d_parent); | |
763 | if (err) | |
764 | goto out_drop_write; | |
765 | ||
766 | type = ovl_path_type(dentry); | |
e9be9d5e | 767 | |
1175b6b8 | 768 | old_cred = ovl_override_creds(dentry->d_sb); |
2aff4534 | 769 | if (!ovl_lower_positive(dentry)) |
1175b6b8 VG |
770 | err = ovl_remove_upper(dentry, is_dir); |
771 | else | |
a105d685 | 772 | err = ovl_remove_and_whiteout(dentry, is_dir); |
1175b6b8 | 773 | revert_creds(old_cred); |
dbc816d0 MS |
774 | if (!err) { |
775 | if (is_dir) | |
776 | clear_nlink(dentry->d_inode); | |
777 | else | |
778 | drop_nlink(dentry->d_inode); | |
779 | } | |
e9be9d5e MS |
780 | out_drop_write: |
781 | ovl_drop_write(dentry); | |
782 | out: | |
783 | return err; | |
784 | } | |
785 | ||
786 | static int ovl_unlink(struct inode *dir, struct dentry *dentry) | |
787 | { | |
788 | return ovl_do_remove(dentry, false); | |
789 | } | |
790 | ||
791 | static int ovl_rmdir(struct inode *dir, struct dentry *dentry) | |
792 | { | |
793 | return ovl_do_remove(dentry, true); | |
794 | } | |
795 | ||
370e55ac MS |
796 | static bool ovl_type_merge_or_lower(struct dentry *dentry) |
797 | { | |
798 | enum ovl_path_type type = ovl_path_type(dentry); | |
799 | ||
800 | return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); | |
801 | } | |
802 | ||
a6c60655 MS |
803 | static bool ovl_can_move(struct dentry *dentry) |
804 | { | |
805 | return ovl_redirect_dir(dentry->d_sb) || | |
806 | !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry); | |
807 | } | |
808 | ||
a6c60655 MS |
809 | static char *ovl_get_redirect(struct dentry *dentry, bool samedir) |
810 | { | |
811 | char *buf, *ret; | |
812 | struct dentry *d, *tmp; | |
3ea22a71 | 813 | int buflen = ovl_redirect_max + 1; |
a6c60655 MS |
814 | |
815 | if (samedir) { | |
816 | ret = kstrndup(dentry->d_name.name, dentry->d_name.len, | |
817 | GFP_KERNEL); | |
818 | goto out; | |
819 | } | |
820 | ||
821 | buf = ret = kmalloc(buflen, GFP_TEMPORARY); | |
822 | if (!buf) | |
823 | goto out; | |
824 | ||
825 | buflen--; | |
826 | buf[buflen] = '\0'; | |
827 | for (d = dget(dentry); !IS_ROOT(d);) { | |
828 | const char *name; | |
829 | int thislen; | |
830 | ||
831 | spin_lock(&d->d_lock); | |
832 | name = ovl_dentry_get_redirect(d); | |
833 | if (name) { | |
834 | thislen = strlen(name); | |
835 | } else { | |
836 | name = d->d_name.name; | |
837 | thislen = d->d_name.len; | |
838 | } | |
839 | ||
840 | /* If path is too long, fall back to userspace move */ | |
841 | if (thislen + (name[0] != '/') > buflen) { | |
842 | ret = ERR_PTR(-EXDEV); | |
843 | spin_unlock(&d->d_lock); | |
844 | goto out_put; | |
845 | } | |
846 | ||
847 | buflen -= thislen; | |
848 | memcpy(&buf[buflen], name, thislen); | |
849 | tmp = dget_dlock(d->d_parent); | |
850 | spin_unlock(&d->d_lock); | |
851 | ||
852 | dput(d); | |
853 | d = tmp; | |
854 | ||
855 | /* Absolute redirect: finished */ | |
856 | if (buf[buflen] == '/') | |
857 | break; | |
858 | buflen--; | |
859 | buf[buflen] = '/'; | |
860 | } | |
861 | ret = kstrdup(&buf[buflen], GFP_KERNEL); | |
862 | out_put: | |
863 | dput(d); | |
864 | kfree(buf); | |
865 | out: | |
866 | return ret ? ret : ERR_PTR(-ENOMEM); | |
867 | } | |
868 | ||
869 | static int ovl_set_redirect(struct dentry *dentry, bool samedir) | |
870 | { | |
871 | int err; | |
872 | const char *redirect = ovl_dentry_get_redirect(dentry); | |
873 | ||
874 | if (redirect && (samedir || redirect[0] == '/')) | |
875 | return 0; | |
876 | ||
877 | redirect = ovl_get_redirect(dentry, samedir); | |
878 | if (IS_ERR(redirect)) | |
879 | return PTR_ERR(redirect); | |
880 | ||
21a22878 AG |
881 | err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry), |
882 | OVL_XATTR_REDIRECT, | |
883 | redirect, strlen(redirect), -EXDEV); | |
a6c60655 MS |
884 | if (!err) { |
885 | spin_lock(&dentry->d_lock); | |
886 | ovl_dentry_set_redirect(dentry, redirect); | |
887 | spin_unlock(&dentry->d_lock); | |
888 | } else { | |
889 | kfree(redirect); | |
21a22878 | 890 | pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err); |
a6c60655 MS |
891 | /* Fall back to userspace copy-up */ |
892 | err = -EXDEV; | |
893 | } | |
894 | return err; | |
895 | } | |
896 | ||
6c02cb59 MS |
897 | static int ovl_rename(struct inode *olddir, struct dentry *old, |
898 | struct inode *newdir, struct dentry *new, | |
899 | unsigned int flags) | |
e9be9d5e MS |
900 | { |
901 | int err; | |
e9be9d5e MS |
902 | struct dentry *old_upperdir; |
903 | struct dentry *new_upperdir; | |
904 | struct dentry *olddentry; | |
905 | struct dentry *newdentry; | |
906 | struct dentry *trap; | |
907 | bool old_opaque; | |
908 | bool new_opaque; | |
e9be9d5e MS |
909 | bool cleanup_whiteout = false; |
910 | bool overwrite = !(flags & RENAME_EXCHANGE); | |
e36cb0b8 | 911 | bool is_dir = d_is_dir(old); |
370e55ac | 912 | bool new_is_dir = d_is_dir(new); |
a6c60655 | 913 | bool samedir = olddir == newdir; |
e9be9d5e MS |
914 | struct dentry *opaquedir = NULL; |
915 | const struct cred *old_cred = NULL; | |
e9be9d5e MS |
916 | |
917 | err = -EINVAL; | |
918 | if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) | |
919 | goto out; | |
920 | ||
921 | flags &= ~RENAME_NOREPLACE; | |
922 | ||
e9be9d5e | 923 | /* Don't copy up directory trees */ |
e9be9d5e | 924 | err = -EXDEV; |
a6c60655 | 925 | if (!ovl_can_move(old)) |
370e55ac | 926 | goto out; |
a6c60655 | 927 | if (!overwrite && !ovl_can_move(new)) |
e9be9d5e | 928 | goto out; |
e9be9d5e MS |
929 | |
930 | err = ovl_want_write(old); | |
931 | if (err) | |
932 | goto out; | |
933 | ||
934 | err = ovl_copy_up(old); | |
935 | if (err) | |
936 | goto out_drop_write; | |
937 | ||
938 | err = ovl_copy_up(new->d_parent); | |
939 | if (err) | |
940 | goto out_drop_write; | |
941 | if (!overwrite) { | |
942 | err = ovl_copy_up(new); | |
943 | if (err) | |
944 | goto out_drop_write; | |
945 | } | |
946 | ||
1175b6b8 | 947 | old_cred = ovl_override_creds(old->d_sb); |
e9be9d5e | 948 | |
370e55ac | 949 | if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) { |
a105d685 | 950 | opaquedir = ovl_check_empty_and_clear(new); |
e9be9d5e MS |
951 | err = PTR_ERR(opaquedir); |
952 | if (IS_ERR(opaquedir)) { | |
953 | opaquedir = NULL; | |
954 | goto out_revert_creds; | |
955 | } | |
956 | } | |
957 | ||
958 | if (overwrite) { | |
2aff4534 | 959 | if (ovl_lower_positive(old)) { |
c412ce49 | 960 | if (!ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
961 | /* Whiteout source */ |
962 | flags |= RENAME_WHITEOUT; | |
963 | } else { | |
964 | /* Switch whiteouts */ | |
965 | flags |= RENAME_EXCHANGE; | |
966 | } | |
c412ce49 | 967 | } else if (is_dir && ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
968 | flags |= RENAME_EXCHANGE; |
969 | cleanup_whiteout = true; | |
970 | } | |
971 | } | |
972 | ||
973 | old_upperdir = ovl_dentry_upper(old->d_parent); | |
974 | new_upperdir = ovl_dentry_upper(new->d_parent); | |
975 | ||
ee1d6d37 AG |
976 | if (!samedir) { |
977 | /* | |
978 | * When moving a merge dir or non-dir with copy up origin into | |
979 | * a non-merge upper dir (a.k.a pure upper dir), we are making | |
980 | * the target parent dir "impure". ovl_iterate() iterates pure | |
981 | * upper dirs directly, because there is no need to filter out | |
982 | * whiteouts and merge dir content with lower dir. But for the | |
983 | * case of an "impure" upper dir, ovl_iterate() cannot iterate | |
984 | * the real directory directly, because it looks for the inode | |
985 | * numbers to fill d_ino in the entries origin inode. | |
986 | */ | |
987 | if (ovl_type_origin(old) && !ovl_type_merge(new->d_parent)) { | |
988 | err = ovl_set_impure(new->d_parent, new_upperdir); | |
989 | if (err) | |
990 | goto out_revert_creds; | |
991 | } | |
992 | if (!overwrite && ovl_type_origin(new) && | |
993 | !ovl_type_merge(old->d_parent)) { | |
994 | err = ovl_set_impure(old->d_parent, old_upperdir); | |
995 | if (err) | |
996 | goto out_revert_creds; | |
997 | } | |
998 | } | |
999 | ||
e9be9d5e MS |
1000 | trap = lock_rename(new_upperdir, old_upperdir); |
1001 | ||
11f37104 MS |
1002 | olddentry = lookup_one_len(old->d_name.name, old_upperdir, |
1003 | old->d_name.len); | |
1004 | err = PTR_ERR(olddentry); | |
1005 | if (IS_ERR(olddentry)) | |
1006 | goto out_unlock; | |
1007 | ||
1008 | err = -ESTALE; | |
1009 | if (olddentry != ovl_dentry_upper(old)) | |
1010 | goto out_dput_old; | |
1011 | ||
1012 | newdentry = lookup_one_len(new->d_name.name, new_upperdir, | |
1013 | new->d_name.len); | |
1014 | err = PTR_ERR(newdentry); | |
1015 | if (IS_ERR(newdentry)) | |
1016 | goto out_dput_old; | |
1017 | ||
3ee23ff1 MS |
1018 | old_opaque = ovl_dentry_is_opaque(old); |
1019 | new_opaque = ovl_dentry_is_opaque(new); | |
1020 | ||
11f37104 MS |
1021 | err = -ESTALE; |
1022 | if (ovl_dentry_upper(new)) { | |
e9be9d5e | 1023 | if (opaquedir) { |
11f37104 MS |
1024 | if (newdentry != opaquedir) |
1025 | goto out_dput; | |
e9be9d5e | 1026 | } else { |
11f37104 MS |
1027 | if (newdentry != ovl_dentry_upper(new)) |
1028 | goto out_dput; | |
e9be9d5e MS |
1029 | } |
1030 | } else { | |
11f37104 MS |
1031 | if (!d_is_negative(newdentry) && |
1032 | (!new_opaque || !ovl_is_whiteout(newdentry))) | |
1033 | goto out_dput; | |
e9be9d5e MS |
1034 | } |
1035 | ||
e9be9d5e MS |
1036 | if (olddentry == trap) |
1037 | goto out_dput; | |
1038 | if (newdentry == trap) | |
1039 | goto out_dput; | |
1040 | ||
804032fa MS |
1041 | if (WARN_ON(olddentry->d_inode == newdentry->d_inode)) |
1042 | goto out_dput; | |
1043 | ||
5cf5b477 | 1044 | err = 0; |
a6c60655 | 1045 | if (is_dir) { |
5cf5b477 | 1046 | if (ovl_type_merge_or_lower(old)) |
a6c60655 | 1047 | err = ovl_set_redirect(old, samedir); |
97c684cc | 1048 | else if (!old_opaque && ovl_type_merge(new->d_parent)) |
21a22878 | 1049 | err = ovl_set_opaque_xerr(old, olddentry, -EXDEV); |
5cf5b477 MS |
1050 | if (err) |
1051 | goto out_dput; | |
e9be9d5e | 1052 | } |
a6c60655 | 1053 | if (!overwrite && new_is_dir) { |
5cf5b477 | 1054 | if (ovl_type_merge_or_lower(new)) |
a6c60655 | 1055 | err = ovl_set_redirect(new, samedir); |
97c684cc | 1056 | else if (!new_opaque && ovl_type_merge(old->d_parent)) |
21a22878 | 1057 | err = ovl_set_opaque_xerr(new, newdentry, -EXDEV); |
5cf5b477 MS |
1058 | if (err) |
1059 | goto out_dput; | |
e9be9d5e MS |
1060 | } |
1061 | ||
3ee23ff1 MS |
1062 | err = ovl_do_rename(old_upperdir->d_inode, olddentry, |
1063 | new_upperdir->d_inode, newdentry, flags); | |
1064 | if (err) | |
e9be9d5e | 1065 | goto out_dput; |
e9be9d5e MS |
1066 | |
1067 | if (cleanup_whiteout) | |
1068 | ovl_cleanup(old_upperdir->d_inode, newdentry); | |
1069 | ||
1070 | ovl_dentry_version_inc(old->d_parent); | |
1071 | ovl_dentry_version_inc(new->d_parent); | |
1072 | ||
1073 | out_dput: | |
1074 | dput(newdentry); | |
11f37104 MS |
1075 | out_dput_old: |
1076 | dput(olddentry); | |
e9be9d5e MS |
1077 | out_unlock: |
1078 | unlock_rename(new_upperdir, old_upperdir); | |
1079 | out_revert_creds: | |
1175b6b8 | 1080 | revert_creds(old_cred); |
e9be9d5e MS |
1081 | out_drop_write: |
1082 | ovl_drop_write(old); | |
1083 | out: | |
1084 | dput(opaquedir); | |
1085 | return err; | |
1086 | } | |
1087 | ||
1088 | const struct inode_operations ovl_dir_inode_operations = { | |
1089 | .lookup = ovl_lookup, | |
1090 | .mkdir = ovl_mkdir, | |
1091 | .symlink = ovl_symlink, | |
1092 | .unlink = ovl_unlink, | |
1093 | .rmdir = ovl_rmdir, | |
6c02cb59 | 1094 | .rename = ovl_rename, |
e9be9d5e MS |
1095 | .link = ovl_link, |
1096 | .setattr = ovl_setattr, | |
1097 | .create = ovl_create, | |
1098 | .mknod = ovl_mknod, | |
1099 | .permission = ovl_permission, | |
5b712091 | 1100 | .getattr = ovl_getattr, |
e9be9d5e | 1101 | .listxattr = ovl_listxattr, |
39a25b2b | 1102 | .get_acl = ovl_get_acl, |
d719e8f2 | 1103 | .update_time = ovl_update_time, |
e9be9d5e | 1104 | }; |