Commit | Line | Data |
---|---|---|
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 | ||
415543d5 | 27 | int ovl_cleanup(struct inode *wdir, struct dentry *wdentry) |
e9be9d5e MS |
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 | } | |
415543d5 AG |
42 | |
43 | return err; | |
e9be9d5e MS |
44 | } |
45 | ||
3d27573c | 46 | struct dentry *ovl_lookup_temp(struct dentry *workdir) |
e9be9d5e MS |
47 | { |
48 | struct dentry *temp; | |
49 | char name[20]; | |
6a45b362 | 50 | static atomic_t temp_id = ATOMIC_INIT(0); |
e9be9d5e | 51 | |
6a45b362 RW |
52 | /* counter is allowed to wrap, since temp dentries are ephemeral */ |
53 | snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id)); | |
e9be9d5e MS |
54 | |
55 | temp = lookup_one_len(name, workdir, strlen(name)); | |
56 | if (!IS_ERR(temp) && temp->d_inode) { | |
57 | pr_err("overlayfs: workdir/%s already exists\n", name); | |
58 | dput(temp); | |
59 | temp = ERR_PTR(-EIO); | |
60 | } | |
61 | ||
62 | return temp; | |
63 | } | |
64 | ||
65 | /* caller holds i_mutex on workdir */ | |
e7dd0e71 | 66 | static struct dentry *ovl_whiteout(struct dentry *workdir) |
e9be9d5e MS |
67 | { |
68 | int err; | |
69 | struct dentry *whiteout; | |
70 | struct inode *wdir = workdir->d_inode; | |
71 | ||
3d27573c | 72 | whiteout = ovl_lookup_temp(workdir); |
e9be9d5e MS |
73 | if (IS_ERR(whiteout)) |
74 | return whiteout; | |
75 | ||
76 | err = ovl_do_whiteout(wdir, whiteout); | |
77 | if (err) { | |
78 | dput(whiteout); | |
79 | whiteout = ERR_PTR(err); | |
80 | } | |
81 | ||
82 | return whiteout; | |
83 | } | |
84 | ||
e7dd0e71 AG |
85 | /* Caller must hold i_mutex on both workdir and dir */ |
86 | int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir, | |
87 | struct dentry *dentry) | |
88 | { | |
89 | struct inode *wdir = workdir->d_inode; | |
90 | struct dentry *whiteout; | |
91 | int err; | |
92 | int flags = 0; | |
93 | ||
94 | whiteout = ovl_whiteout(workdir); | |
95 | err = PTR_ERR(whiteout); | |
96 | if (IS_ERR(whiteout)) | |
97 | return err; | |
98 | ||
99 | if (d_is_dir(dentry)) | |
100 | flags = RENAME_EXCHANGE; | |
101 | ||
102 | err = ovl_do_rename(wdir, whiteout, dir, dentry, flags); | |
103 | if (err) | |
104 | goto kill_whiteout; | |
105 | if (flags) | |
106 | ovl_cleanup(wdir, dentry); | |
107 | ||
108 | out: | |
109 | dput(whiteout); | |
110 | return err; | |
111 | ||
112 | kill_whiteout: | |
113 | ovl_cleanup(wdir, whiteout); | |
114 | goto out; | |
115 | } | |
116 | ||
e9be9d5e | 117 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, |
32a3d848 | 118 | struct cattr *attr, struct dentry *hardlink, bool debug) |
e9be9d5e MS |
119 | { |
120 | int err; | |
121 | ||
122 | if (newdentry->d_inode) | |
123 | return -ESTALE; | |
124 | ||
125 | if (hardlink) { | |
126 | err = ovl_do_link(hardlink, dir, newdentry, debug); | |
127 | } else { | |
32a3d848 | 128 | switch (attr->mode & S_IFMT) { |
e9be9d5e | 129 | case S_IFREG: |
32a3d848 | 130 | err = ovl_do_create(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
131 | break; |
132 | ||
133 | case S_IFDIR: | |
32a3d848 | 134 | err = ovl_do_mkdir(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
135 | break; |
136 | ||
137 | case S_IFCHR: | |
138 | case S_IFBLK: | |
139 | case S_IFIFO: | |
140 | case S_IFSOCK: | |
141 | err = ovl_do_mknod(dir, newdentry, | |
32a3d848 | 142 | attr->mode, attr->rdev, debug); |
e9be9d5e MS |
143 | break; |
144 | ||
145 | case S_IFLNK: | |
32a3d848 | 146 | err = ovl_do_symlink(dir, newdentry, attr->link, debug); |
e9be9d5e MS |
147 | break; |
148 | ||
149 | default: | |
150 | err = -EPERM; | |
151 | } | |
152 | } | |
153 | if (!err && WARN_ON(!newdentry->d_inode)) { | |
154 | /* | |
155 | * Not quite sure if non-instantiated dentry is legal or not. | |
156 | * VFS doesn't seem to care so check and warn here. | |
157 | */ | |
158 | err = -ENOENT; | |
159 | } | |
160 | return err; | |
161 | } | |
162 | ||
21a22878 AG |
163 | static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, |
164 | int xerr) | |
e9be9d5e | 165 | { |
5cf5b477 MS |
166 | int err; |
167 | ||
21a22878 | 168 | err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr); |
5cf5b477 MS |
169 | if (!err) |
170 | ovl_dentry_set_opaque(dentry); | |
171 | ||
172 | return err; | |
e9be9d5e MS |
173 | } |
174 | ||
21a22878 AG |
175 | static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry) |
176 | { | |
177 | /* | |
178 | * Fail with -EIO when trying to create opaque dir and upper doesn't | |
179 | * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to | |
180 | * return a specific error for noxattr case. | |
181 | */ | |
182 | return ovl_set_opaque_xerr(dentry, upperdentry, -EIO); | |
183 | } | |
184 | ||
72e48481 VG |
185 | /* Common operations required to be done after creation of file on upper */ |
186 | static void ovl_instantiate(struct dentry *dentry, struct inode *inode, | |
51f7e52d | 187 | struct dentry *newdentry, bool hardlink) |
72e48481 | 188 | { |
4edb83bb | 189 | ovl_dentry_version_inc(dentry->d_parent, false); |
55acc661 | 190 | ovl_dentry_set_upper_alias(dentry); |
51f7e52d | 191 | if (!hardlink) { |
09d8b586 | 192 | ovl_inode_update(inode, newdentry); |
51f7e52d MS |
193 | ovl_copyattr(newdentry->d_inode, inode); |
194 | } else { | |
09d8b586 MS |
195 | WARN_ON(ovl_inode_real(inode) != d_inode(newdentry)); |
196 | dput(newdentry); | |
51f7e52d MS |
197 | inc_nlink(inode); |
198 | } | |
72e48481 | 199 | d_instantiate(dentry, inode); |
5b6c9053 AG |
200 | /* Force lookup of new upper hardlink to find its lower */ |
201 | if (hardlink) | |
202 | d_drop(dentry); | |
72e48481 VG |
203 | } |
204 | ||
97c684cc AG |
205 | static bool ovl_type_merge(struct dentry *dentry) |
206 | { | |
207 | return OVL_TYPE_MERGE(ovl_path_type(dentry)); | |
208 | } | |
209 | ||
ee1d6d37 AG |
210 | static bool ovl_type_origin(struct dentry *dentry) |
211 | { | |
212 | return OVL_TYPE_ORIGIN(ovl_path_type(dentry)); | |
213 | } | |
214 | ||
e9be9d5e | 215 | static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
32a3d848 | 216 | struct cattr *attr, struct dentry *hardlink) |
e9be9d5e MS |
217 | { |
218 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
219 | struct inode *udir = upperdir->d_inode; | |
220 | struct dentry *newdentry; | |
221 | int err; | |
222 | ||
38b25697 | 223 | if (!hardlink && !IS_POSIXACL(udir)) |
32a3d848 | 224 | attr->mode &= ~current_umask(); |
38b25697 | 225 | |
5955102c | 226 | inode_lock_nested(udir, I_MUTEX_PARENT); |
e9be9d5e MS |
227 | newdentry = lookup_one_len(dentry->d_name.name, upperdir, |
228 | dentry->d_name.len); | |
229 | err = PTR_ERR(newdentry); | |
230 | if (IS_ERR(newdentry)) | |
231 | goto out_unlock; | |
32a3d848 | 232 | err = ovl_create_real(udir, newdentry, attr, hardlink, false); |
e9be9d5e MS |
233 | if (err) |
234 | goto out_dput; | |
235 | ||
4a99f3c8 | 236 | if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
97c684cc AG |
237 | /* Setting opaque here is just an optimization, allow to fail */ |
238 | ovl_set_opaque(dentry, newdentry); | |
239 | } | |
240 | ||
51f7e52d | 241 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
242 | newdentry = NULL; |
243 | out_dput: | |
244 | dput(newdentry); | |
245 | out_unlock: | |
5955102c | 246 | inode_unlock(udir); |
e9be9d5e MS |
247 | return err; |
248 | } | |
249 | ||
e9be9d5e MS |
250 | static struct dentry *ovl_clear_empty(struct dentry *dentry, |
251 | struct list_head *list) | |
252 | { | |
253 | struct dentry *workdir = ovl_workdir(dentry); | |
254 | struct inode *wdir = workdir->d_inode; | |
255 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
256 | struct inode *udir = upperdir->d_inode; | |
257 | struct path upperpath; | |
258 | struct dentry *upper; | |
259 | struct dentry *opaquedir; | |
260 | struct kstat stat; | |
261 | int err; | |
262 | ||
cc6f67bc MS |
263 | if (WARN_ON(!workdir)) |
264 | return ERR_PTR(-EROFS); | |
265 | ||
e9be9d5e MS |
266 | err = ovl_lock_rename_workdir(workdir, upperdir); |
267 | if (err) | |
268 | goto out; | |
269 | ||
270 | ovl_path_upper(dentry, &upperpath); | |
a528d35e DH |
271 | err = vfs_getattr(&upperpath, &stat, |
272 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
273 | if (err) |
274 | goto out_unlock; | |
275 | ||
276 | err = -ESTALE; | |
277 | if (!S_ISDIR(stat.mode)) | |
278 | goto out_unlock; | |
279 | upper = upperpath.dentry; | |
280 | if (upper->d_parent->d_inode != udir) | |
281 | goto out_unlock; | |
282 | ||
3d27573c | 283 | opaquedir = ovl_lookup_temp(workdir); |
e9be9d5e MS |
284 | err = PTR_ERR(opaquedir); |
285 | if (IS_ERR(opaquedir)) | |
286 | goto out_unlock; | |
287 | ||
32a3d848 AV |
288 | err = ovl_create_real(wdir, opaquedir, |
289 | &(struct cattr){.mode = stat.mode}, NULL, true); | |
e9be9d5e MS |
290 | if (err) |
291 | goto out_dput; | |
292 | ||
293 | err = ovl_copy_xattr(upper, opaquedir); | |
294 | if (err) | |
295 | goto out_cleanup; | |
296 | ||
5cf5b477 | 297 | err = ovl_set_opaque(dentry, opaquedir); |
e9be9d5e MS |
298 | if (err) |
299 | goto out_cleanup; | |
300 | ||
5955102c | 301 | inode_lock(opaquedir->d_inode); |
e9be9d5e | 302 | err = ovl_set_attr(opaquedir, &stat); |
5955102c | 303 | inode_unlock(opaquedir->d_inode); |
e9be9d5e MS |
304 | if (err) |
305 | goto out_cleanup; | |
306 | ||
307 | err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); | |
308 | if (err) | |
309 | goto out_cleanup; | |
310 | ||
311 | ovl_cleanup_whiteouts(upper, list); | |
312 | ovl_cleanup(wdir, upper); | |
313 | unlock_rename(workdir, upperdir); | |
314 | ||
315 | /* dentry's upper doesn't match now, get rid of it */ | |
316 | d_drop(dentry); | |
317 | ||
318 | return opaquedir; | |
319 | ||
320 | out_cleanup: | |
321 | ovl_cleanup(wdir, opaquedir); | |
322 | out_dput: | |
323 | dput(opaquedir); | |
324 | out_unlock: | |
325 | unlock_rename(workdir, upperdir); | |
326 | out: | |
327 | return ERR_PTR(err); | |
328 | } | |
329 | ||
38b25697 MS |
330 | static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, |
331 | const struct posix_acl *acl) | |
332 | { | |
333 | void *buffer; | |
334 | size_t size; | |
335 | int err; | |
336 | ||
337 | if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) | |
338 | return 0; | |
339 | ||
340 | size = posix_acl_to_xattr(NULL, acl, NULL, 0); | |
341 | buffer = kmalloc(size, GFP_KERNEL); | |
342 | if (!buffer) | |
343 | return -ENOMEM; | |
344 | ||
345 | size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
346 | err = size; | |
347 | if (err < 0) | |
348 | goto out_free; | |
349 | ||
350 | err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); | |
351 | out_free: | |
352 | kfree(buffer); | |
353 | return err; | |
354 | } | |
355 | ||
e9be9d5e | 356 | static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
32a3d848 | 357 | struct cattr *cattr, |
e9be9d5e MS |
358 | struct dentry *hardlink) |
359 | { | |
360 | struct dentry *workdir = ovl_workdir(dentry); | |
361 | struct inode *wdir = workdir->d_inode; | |
362 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
363 | struct inode *udir = upperdir->d_inode; | |
364 | struct dentry *upper; | |
365 | struct dentry *newdentry; | |
366 | int err; | |
38b25697 | 367 | struct posix_acl *acl, *default_acl; |
e9be9d5e | 368 | |
cc6f67bc MS |
369 | if (WARN_ON(!workdir)) |
370 | return -EROFS; | |
371 | ||
38b25697 MS |
372 | if (!hardlink) { |
373 | err = posix_acl_create(dentry->d_parent->d_inode, | |
32a3d848 | 374 | &cattr->mode, &default_acl, &acl); |
38b25697 MS |
375 | if (err) |
376 | return err; | |
377 | } | |
378 | ||
e9be9d5e MS |
379 | err = ovl_lock_rename_workdir(workdir, upperdir); |
380 | if (err) | |
381 | goto out; | |
382 | ||
3d27573c | 383 | newdentry = ovl_lookup_temp(workdir); |
e9be9d5e MS |
384 | err = PTR_ERR(newdentry); |
385 | if (IS_ERR(newdentry)) | |
386 | goto out_unlock; | |
387 | ||
388 | upper = lookup_one_len(dentry->d_name.name, upperdir, | |
389 | dentry->d_name.len); | |
390 | err = PTR_ERR(upper); | |
391 | if (IS_ERR(upper)) | |
392 | goto out_dput; | |
393 | ||
32a3d848 | 394 | err = ovl_create_real(wdir, newdentry, cattr, hardlink, true); |
e9be9d5e MS |
395 | if (err) |
396 | goto out_dput2; | |
397 | ||
bb0d2b8a MS |
398 | /* |
399 | * mode could have been mutilated due to umask (e.g. sgid directory) | |
400 | */ | |
51f7e52d | 401 | if (!hardlink && |
32a3d848 AV |
402 | !S_ISLNK(cattr->mode) && |
403 | newdentry->d_inode->i_mode != cattr->mode) { | |
bb0d2b8a MS |
404 | struct iattr attr = { |
405 | .ia_valid = ATTR_MODE, | |
32a3d848 | 406 | .ia_mode = cattr->mode, |
bb0d2b8a MS |
407 | }; |
408 | inode_lock(newdentry->d_inode); | |
409 | err = notify_change(newdentry, &attr, NULL); | |
410 | inode_unlock(newdentry->d_inode); | |
411 | if (err) | |
412 | goto out_cleanup; | |
413 | } | |
38b25697 MS |
414 | if (!hardlink) { |
415 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, | |
416 | acl); | |
417 | if (err) | |
418 | goto out_cleanup; | |
419 | ||
420 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, | |
421 | default_acl); | |
422 | if (err) | |
423 | goto out_cleanup; | |
424 | } | |
bb0d2b8a | 425 | |
32a3d848 | 426 | if (!hardlink && S_ISDIR(cattr->mode)) { |
5cf5b477 | 427 | err = ovl_set_opaque(dentry, newdentry); |
e9be9d5e MS |
428 | if (err) |
429 | goto out_cleanup; | |
430 | ||
431 | err = ovl_do_rename(wdir, newdentry, udir, upper, | |
432 | RENAME_EXCHANGE); | |
433 | if (err) | |
434 | goto out_cleanup; | |
435 | ||
436 | ovl_cleanup(wdir, upper); | |
437 | } else { | |
438 | err = ovl_do_rename(wdir, newdentry, udir, upper, 0); | |
439 | if (err) | |
440 | goto out_cleanup; | |
441 | } | |
51f7e52d | 442 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
443 | newdentry = NULL; |
444 | out_dput2: | |
445 | dput(upper); | |
446 | out_dput: | |
447 | dput(newdentry); | |
448 | out_unlock: | |
449 | unlock_rename(workdir, upperdir); | |
450 | out: | |
38b25697 MS |
451 | if (!hardlink) { |
452 | posix_acl_release(acl); | |
453 | posix_acl_release(default_acl); | |
454 | } | |
e9be9d5e MS |
455 | return err; |
456 | ||
457 | out_cleanup: | |
458 | ovl_cleanup(wdir, newdentry); | |
459 | goto out_dput2; | |
460 | } | |
461 | ||
51f7e52d | 462 | static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
ea3dad18 AG |
463 | struct cattr *attr, struct dentry *hardlink, |
464 | bool origin) | |
e9be9d5e MS |
465 | { |
466 | int err; | |
1175b6b8 VG |
467 | const struct cred *old_cred; |
468 | struct cred *override_cred; | |
ea3dad18 | 469 | struct dentry *parent = dentry->d_parent; |
e9be9d5e | 470 | |
ea3dad18 | 471 | err = ovl_copy_up(parent); |
e9be9d5e | 472 | if (err) |
51f7e52d | 473 | return err; |
bb0d2b8a | 474 | |
1175b6b8 | 475 | old_cred = ovl_override_creds(dentry->d_sb); |
ea3dad18 AG |
476 | |
477 | /* | |
478 | * When linking a file with copy up origin into a new parent, mark the | |
479 | * new parent dir "impure". | |
480 | */ | |
481 | if (origin) { | |
482 | err = ovl_set_impure(parent, ovl_dentry_upper(parent)); | |
483 | if (err) | |
484 | goto out_revert_creds; | |
485 | } | |
486 | ||
1175b6b8 VG |
487 | err = -ENOMEM; |
488 | override_cred = prepare_creds(); | |
489 | if (override_cred) { | |
bb0d2b8a MS |
490 | override_cred->fsuid = inode->i_uid; |
491 | override_cred->fsgid = inode->i_gid; | |
2602625b VG |
492 | if (!hardlink) { |
493 | err = security_dentry_create_files_as(dentry, | |
32a3d848 | 494 | attr->mode, &dentry->d_name, old_cred, |
2602625b VG |
495 | override_cred); |
496 | if (err) { | |
497 | put_cred(override_cred); | |
498 | goto out_revert_creds; | |
499 | } | |
500 | } | |
1175b6b8 VG |
501 | put_cred(override_creds(override_cred)); |
502 | put_cred(override_cred); | |
503 | ||
c412ce49 | 504 | if (!ovl_dentry_is_whiteout(dentry)) |
32a3d848 | 505 | err = ovl_create_upper(dentry, inode, attr, |
1175b6b8 VG |
506 | hardlink); |
507 | else | |
32a3d848 AV |
508 | err = ovl_create_over_whiteout(dentry, inode, attr, |
509 | hardlink); | |
e9be9d5e | 510 | } |
2602625b | 511 | out_revert_creds: |
1175b6b8 | 512 | revert_creds(old_cred); |
bb0d2b8a MS |
513 | if (!err) { |
514 | struct inode *realinode = d_inode(ovl_dentry_upper(dentry)); | |
515 | ||
516 | WARN_ON(inode->i_mode != realinode->i_mode); | |
517 | WARN_ON(!uid_eq(inode->i_uid, realinode->i_uid)); | |
518 | WARN_ON(!gid_eq(inode->i_gid, realinode->i_gid)); | |
bb0d2b8a | 519 | } |
e9be9d5e MS |
520 | return err; |
521 | } | |
522 | ||
523 | static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev, | |
524 | const char *link) | |
525 | { | |
526 | int err; | |
51f7e52d | 527 | struct inode *inode; |
32a3d848 | 528 | struct cattr attr = { |
51f7e52d | 529 | .rdev = rdev, |
32a3d848 | 530 | .link = link, |
51f7e52d | 531 | }; |
e9be9d5e MS |
532 | |
533 | err = ovl_want_write(dentry); | |
51f7e52d MS |
534 | if (err) |
535 | goto out; | |
536 | ||
537 | err = -ENOMEM; | |
ca4c8a3a | 538 | inode = ovl_new_inode(dentry->d_sb, mode, rdev); |
51f7e52d MS |
539 | if (!inode) |
540 | goto out_drop_write; | |
541 | ||
542 | inode_init_owner(inode, dentry->d_parent->d_inode, mode); | |
32a3d848 | 543 | attr.mode = inode->i_mode; |
51f7e52d | 544 | |
ea3dad18 | 545 | err = ovl_create_or_link(dentry, inode, &attr, NULL, false); |
51f7e52d MS |
546 | if (err) |
547 | iput(inode); | |
e9be9d5e | 548 | |
51f7e52d MS |
549 | out_drop_write: |
550 | ovl_drop_write(dentry); | |
551 | out: | |
e9be9d5e MS |
552 | return err; |
553 | } | |
554 | ||
555 | static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
556 | bool excl) | |
557 | { | |
558 | return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL); | |
559 | } | |
560 | ||
561 | static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
562 | { | |
563 | return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL); | |
564 | } | |
565 | ||
566 | static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, | |
567 | dev_t rdev) | |
568 | { | |
569 | /* Don't allow creation of "whiteout" on overlay */ | |
570 | if (S_ISCHR(mode) && rdev == WHITEOUT_DEV) | |
571 | return -EPERM; | |
572 | ||
573 | return ovl_create_object(dentry, mode, rdev, NULL); | |
574 | } | |
575 | ||
576 | static int ovl_symlink(struct inode *dir, struct dentry *dentry, | |
577 | const char *link) | |
578 | { | |
579 | return ovl_create_object(dentry, S_IFLNK, 0, link); | |
580 | } | |
581 | ||
582 | static int ovl_link(struct dentry *old, struct inode *newdir, | |
583 | struct dentry *new) | |
584 | { | |
585 | int err; | |
5f8415d6 | 586 | bool locked = false; |
51f7e52d | 587 | struct inode *inode; |
e9be9d5e MS |
588 | |
589 | err = ovl_want_write(old); | |
590 | if (err) | |
591 | goto out; | |
592 | ||
593 | err = ovl_copy_up(old); | |
594 | if (err) | |
595 | goto out_drop_write; | |
596 | ||
5f8415d6 AG |
597 | err = ovl_nlink_start(old, &locked); |
598 | if (err) | |
599 | goto out_drop_write; | |
600 | ||
51f7e52d MS |
601 | inode = d_inode(old); |
602 | ihold(inode); | |
603 | ||
ea3dad18 AG |
604 | err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old), |
605 | ovl_type_origin(old)); | |
51f7e52d MS |
606 | if (err) |
607 | iput(inode); | |
e9be9d5e | 608 | |
5f8415d6 | 609 | ovl_nlink_end(old, locked); |
e9be9d5e MS |
610 | out_drop_write: |
611 | ovl_drop_write(old); | |
612 | out: | |
613 | return err; | |
614 | } | |
615 | ||
9020df37 MS |
616 | static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper) |
617 | { | |
618 | return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper); | |
619 | } | |
620 | ||
6d0a8a90 AG |
621 | static int ovl_remove_and_whiteout(struct dentry *dentry, |
622 | struct list_head *list) | |
e9be9d5e MS |
623 | { |
624 | struct dentry *workdir = ovl_workdir(dentry); | |
e9be9d5e | 625 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); |
e9be9d5e MS |
626 | struct dentry *upper; |
627 | struct dentry *opaquedir = NULL; | |
628 | int err; | |
629 | ||
cc6f67bc MS |
630 | if (WARN_ON(!workdir)) |
631 | return -EROFS; | |
632 | ||
6d0a8a90 AG |
633 | if (!list_empty(list)) { |
634 | opaquedir = ovl_clear_empty(dentry, list); | |
30c17ebf MS |
635 | err = PTR_ERR(opaquedir); |
636 | if (IS_ERR(opaquedir)) | |
637 | goto out; | |
e9be9d5e MS |
638 | } |
639 | ||
640 | err = ovl_lock_rename_workdir(workdir, upperdir); | |
641 | if (err) | |
642 | goto out_dput; | |
643 | ||
cfc9fde0 MP |
644 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
645 | dentry->d_name.len); | |
646 | err = PTR_ERR(upper); | |
647 | if (IS_ERR(upper)) | |
e9be9d5e MS |
648 | goto out_unlock; |
649 | ||
cfc9fde0 MP |
650 | err = -ESTALE; |
651 | if ((opaquedir && upper != opaquedir) || | |
652 | (!opaquedir && ovl_dentry_upper(dentry) && | |
9020df37 | 653 | !ovl_matches_upper(dentry, upper))) { |
cfc9fde0 MP |
654 | goto out_dput_upper; |
655 | } | |
e9be9d5e | 656 | |
e7dd0e71 | 657 | err = ovl_cleanup_and_whiteout(workdir, d_inode(upperdir), upper); |
cfc9fde0 | 658 | if (err) |
e7dd0e71 | 659 | goto out_d_drop; |
e9be9d5e | 660 | |
4edb83bb | 661 | ovl_dentry_version_inc(dentry->d_parent, true); |
e9be9d5e MS |
662 | out_d_drop: |
663 | d_drop(dentry); | |
cfc9fde0 MP |
664 | out_dput_upper: |
665 | dput(upper); | |
e9be9d5e MS |
666 | out_unlock: |
667 | unlock_rename(workdir, upperdir); | |
668 | out_dput: | |
669 | dput(opaquedir); | |
670 | out: | |
671 | return err; | |
e9be9d5e MS |
672 | } |
673 | ||
6d0a8a90 AG |
674 | static int ovl_remove_upper(struct dentry *dentry, bool is_dir, |
675 | struct list_head *list) | |
e9be9d5e MS |
676 | { |
677 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
678 | struct inode *dir = upperdir->d_inode; | |
11f37104 | 679 | struct dentry *upper; |
d1595119 | 680 | struct dentry *opaquedir = NULL; |
e9be9d5e MS |
681 | int err; |
682 | ||
6d0a8a90 AG |
683 | if (!list_empty(list)) { |
684 | opaquedir = ovl_clear_empty(dentry, list); | |
d1595119 AG |
685 | err = PTR_ERR(opaquedir); |
686 | if (IS_ERR(opaquedir)) | |
687 | goto out; | |
688 | } | |
689 | ||
5955102c | 690 | inode_lock_nested(dir, I_MUTEX_PARENT); |
11f37104 MS |
691 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
692 | dentry->d_name.len); | |
693 | err = PTR_ERR(upper); | |
694 | if (IS_ERR(upper)) | |
695 | goto out_unlock; | |
696 | ||
e9be9d5e | 697 | err = -ESTALE; |
d1595119 | 698 | if ((opaquedir && upper != opaquedir) || |
9020df37 | 699 | (!opaquedir && !ovl_matches_upper(dentry, upper))) |
d1595119 AG |
700 | goto out_dput_upper; |
701 | ||
702 | if (is_dir) | |
703 | err = vfs_rmdir(dir, upper); | |
704 | else | |
705 | err = vfs_unlink(dir, upper, NULL); | |
4edb83bb | 706 | ovl_dentry_version_inc(dentry->d_parent, ovl_type_origin(dentry)); |
e9be9d5e MS |
707 | |
708 | /* | |
709 | * Keeping this dentry hashed would mean having to release | |
710 | * upperpath/lowerpath, which could only be done if we are the | |
711 | * sole user of this dentry. Too tricky... Just unhash for | |
712 | * now. | |
713 | */ | |
ce9113bb RW |
714 | if (!err) |
715 | d_drop(dentry); | |
d1595119 AG |
716 | out_dput_upper: |
717 | dput(upper); | |
11f37104 | 718 | out_unlock: |
5955102c | 719 | inode_unlock(dir); |
d1595119 AG |
720 | dput(opaquedir); |
721 | out: | |
e9be9d5e MS |
722 | return err; |
723 | } | |
724 | ||
6d0a8a90 AG |
725 | static bool ovl_pure_upper(struct dentry *dentry) |
726 | { | |
727 | return !ovl_dentry_lower(dentry) && | |
728 | !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry)); | |
729 | } | |
730 | ||
e9be9d5e MS |
731 | static int ovl_do_remove(struct dentry *dentry, bool is_dir) |
732 | { | |
e9be9d5e | 733 | int err; |
5f8415d6 | 734 | bool locked = false; |
1175b6b8 | 735 | const struct cred *old_cred; |
6d0a8a90 AG |
736 | bool lower_positive = ovl_lower_positive(dentry); |
737 | LIST_HEAD(list); | |
738 | ||
739 | /* No need to clean pure upper removed by vfs_rmdir() */ | |
740 | if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) { | |
741 | err = ovl_check_empty_dir(dentry, &list); | |
742 | if (err) | |
743 | goto out; | |
744 | } | |
1175b6b8 | 745 | |
e9be9d5e MS |
746 | err = ovl_want_write(dentry); |
747 | if (err) | |
748 | goto out; | |
749 | ||
750 | err = ovl_copy_up(dentry->d_parent); | |
751 | if (err) | |
752 | goto out_drop_write; | |
753 | ||
5f8415d6 AG |
754 | err = ovl_nlink_start(dentry, &locked); |
755 | if (err) | |
756 | goto out_drop_write; | |
e9be9d5e | 757 | |
1175b6b8 | 758 | old_cred = ovl_override_creds(dentry->d_sb); |
6d0a8a90 AG |
759 | if (!lower_positive) |
760 | err = ovl_remove_upper(dentry, is_dir, &list); | |
1175b6b8 | 761 | else |
6d0a8a90 | 762 | err = ovl_remove_and_whiteout(dentry, &list); |
1175b6b8 | 763 | revert_creds(old_cred); |
dbc816d0 MS |
764 | if (!err) { |
765 | if (is_dir) | |
766 | clear_nlink(dentry->d_inode); | |
767 | else | |
768 | drop_nlink(dentry->d_inode); | |
769 | } | |
5f8415d6 | 770 | ovl_nlink_end(dentry, locked); |
e9be9d5e MS |
771 | out_drop_write: |
772 | ovl_drop_write(dentry); | |
773 | out: | |
6d0a8a90 | 774 | ovl_cache_free(&list); |
e9be9d5e MS |
775 | return err; |
776 | } | |
777 | ||
778 | static int ovl_unlink(struct inode *dir, struct dentry *dentry) | |
779 | { | |
780 | return ovl_do_remove(dentry, false); | |
781 | } | |
782 | ||
783 | static int ovl_rmdir(struct inode *dir, struct dentry *dentry) | |
784 | { | |
785 | return ovl_do_remove(dentry, true); | |
786 | } | |
787 | ||
370e55ac MS |
788 | static bool ovl_type_merge_or_lower(struct dentry *dentry) |
789 | { | |
790 | enum ovl_path_type type = ovl_path_type(dentry); | |
791 | ||
792 | return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); | |
793 | } | |
794 | ||
a6c60655 MS |
795 | static bool ovl_can_move(struct dentry *dentry) |
796 | { | |
797 | return ovl_redirect_dir(dentry->d_sb) || | |
798 | !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry); | |
799 | } | |
800 | ||
a6c60655 MS |
801 | static char *ovl_get_redirect(struct dentry *dentry, bool samedir) |
802 | { | |
803 | char *buf, *ret; | |
804 | struct dentry *d, *tmp; | |
3ea22a71 | 805 | int buflen = ovl_redirect_max + 1; |
a6c60655 MS |
806 | |
807 | if (samedir) { | |
808 | ret = kstrndup(dentry->d_name.name, dentry->d_name.len, | |
809 | GFP_KERNEL); | |
810 | goto out; | |
811 | } | |
812 | ||
0ee931c4 | 813 | buf = ret = kmalloc(buflen, GFP_KERNEL); |
a6c60655 MS |
814 | if (!buf) |
815 | goto out; | |
816 | ||
817 | buflen--; | |
818 | buf[buflen] = '\0'; | |
819 | for (d = dget(dentry); !IS_ROOT(d);) { | |
820 | const char *name; | |
821 | int thislen; | |
822 | ||
823 | spin_lock(&d->d_lock); | |
824 | name = ovl_dentry_get_redirect(d); | |
825 | if (name) { | |
826 | thislen = strlen(name); | |
827 | } else { | |
828 | name = d->d_name.name; | |
829 | thislen = d->d_name.len; | |
830 | } | |
831 | ||
832 | /* If path is too long, fall back to userspace move */ | |
833 | if (thislen + (name[0] != '/') > buflen) { | |
834 | ret = ERR_PTR(-EXDEV); | |
835 | spin_unlock(&d->d_lock); | |
836 | goto out_put; | |
837 | } | |
838 | ||
839 | buflen -= thislen; | |
840 | memcpy(&buf[buflen], name, thislen); | |
841 | tmp = dget_dlock(d->d_parent); | |
842 | spin_unlock(&d->d_lock); | |
843 | ||
844 | dput(d); | |
845 | d = tmp; | |
846 | ||
847 | /* Absolute redirect: finished */ | |
848 | if (buf[buflen] == '/') | |
849 | break; | |
850 | buflen--; | |
851 | buf[buflen] = '/'; | |
852 | } | |
853 | ret = kstrdup(&buf[buflen], GFP_KERNEL); | |
854 | out_put: | |
855 | dput(d); | |
856 | kfree(buf); | |
857 | out: | |
858 | return ret ? ret : ERR_PTR(-ENOMEM); | |
859 | } | |
860 | ||
861 | static int ovl_set_redirect(struct dentry *dentry, bool samedir) | |
862 | { | |
863 | int err; | |
864 | const char *redirect = ovl_dentry_get_redirect(dentry); | |
865 | ||
866 | if (redirect && (samedir || redirect[0] == '/')) | |
867 | return 0; | |
868 | ||
869 | redirect = ovl_get_redirect(dentry, samedir); | |
870 | if (IS_ERR(redirect)) | |
871 | return PTR_ERR(redirect); | |
872 | ||
21a22878 AG |
873 | err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry), |
874 | OVL_XATTR_REDIRECT, | |
875 | redirect, strlen(redirect), -EXDEV); | |
a6c60655 MS |
876 | if (!err) { |
877 | spin_lock(&dentry->d_lock); | |
878 | ovl_dentry_set_redirect(dentry, redirect); | |
879 | spin_unlock(&dentry->d_lock); | |
880 | } else { | |
881 | kfree(redirect); | |
da2e6b7e AG |
882 | pr_warn_ratelimited("overlayfs: failed to set redirect (%i)\n", |
883 | err); | |
a6c60655 MS |
884 | /* Fall back to userspace copy-up */ |
885 | err = -EXDEV; | |
886 | } | |
887 | return err; | |
888 | } | |
889 | ||
6c02cb59 MS |
890 | static int ovl_rename(struct inode *olddir, struct dentry *old, |
891 | struct inode *newdir, struct dentry *new, | |
892 | unsigned int flags) | |
e9be9d5e MS |
893 | { |
894 | int err; | |
5f8415d6 | 895 | bool locked = false; |
e9be9d5e MS |
896 | struct dentry *old_upperdir; |
897 | struct dentry *new_upperdir; | |
898 | struct dentry *olddentry; | |
899 | struct dentry *newdentry; | |
900 | struct dentry *trap; | |
901 | bool old_opaque; | |
902 | bool new_opaque; | |
e9be9d5e MS |
903 | bool cleanup_whiteout = false; |
904 | bool overwrite = !(flags & RENAME_EXCHANGE); | |
e36cb0b8 | 905 | bool is_dir = d_is_dir(old); |
370e55ac | 906 | bool new_is_dir = d_is_dir(new); |
a6c60655 | 907 | bool samedir = olddir == newdir; |
e9be9d5e MS |
908 | struct dentry *opaquedir = NULL; |
909 | const struct cred *old_cred = NULL; | |
6d0a8a90 | 910 | LIST_HEAD(list); |
e9be9d5e MS |
911 | |
912 | err = -EINVAL; | |
913 | if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) | |
914 | goto out; | |
915 | ||
916 | flags &= ~RENAME_NOREPLACE; | |
917 | ||
e9be9d5e | 918 | /* Don't copy up directory trees */ |
e9be9d5e | 919 | err = -EXDEV; |
a6c60655 | 920 | if (!ovl_can_move(old)) |
370e55ac | 921 | goto out; |
a6c60655 | 922 | if (!overwrite && !ovl_can_move(new)) |
e9be9d5e | 923 | goto out; |
e9be9d5e | 924 | |
6d0a8a90 AG |
925 | if (overwrite && new_is_dir && !ovl_pure_upper(new)) { |
926 | err = ovl_check_empty_dir(new, &list); | |
927 | if (err) | |
928 | goto out; | |
929 | } | |
930 | ||
931 | if (overwrite) { | |
932 | if (ovl_lower_positive(old)) { | |
933 | if (!ovl_dentry_is_whiteout(new)) { | |
934 | /* Whiteout source */ | |
935 | flags |= RENAME_WHITEOUT; | |
936 | } else { | |
937 | /* Switch whiteouts */ | |
938 | flags |= RENAME_EXCHANGE; | |
939 | } | |
940 | } else if (is_dir && ovl_dentry_is_whiteout(new)) { | |
941 | flags |= RENAME_EXCHANGE; | |
942 | cleanup_whiteout = true; | |
943 | } | |
944 | } | |
945 | ||
e9be9d5e MS |
946 | err = ovl_want_write(old); |
947 | if (err) | |
948 | goto out; | |
949 | ||
950 | err = ovl_copy_up(old); | |
951 | if (err) | |
952 | goto out_drop_write; | |
953 | ||
954 | err = ovl_copy_up(new->d_parent); | |
955 | if (err) | |
956 | goto out_drop_write; | |
957 | if (!overwrite) { | |
958 | err = ovl_copy_up(new); | |
959 | if (err) | |
960 | goto out_drop_write; | |
5f8415d6 AG |
961 | } else { |
962 | err = ovl_nlink_start(new, &locked); | |
963 | if (err) | |
964 | goto out_drop_write; | |
e9be9d5e MS |
965 | } |
966 | ||
1175b6b8 | 967 | old_cred = ovl_override_creds(old->d_sb); |
e9be9d5e | 968 | |
6d0a8a90 AG |
969 | if (!list_empty(&list)) { |
970 | opaquedir = ovl_clear_empty(new, &list); | |
e9be9d5e MS |
971 | err = PTR_ERR(opaquedir); |
972 | if (IS_ERR(opaquedir)) { | |
973 | opaquedir = NULL; | |
974 | goto out_revert_creds; | |
975 | } | |
976 | } | |
977 | ||
e9be9d5e MS |
978 | old_upperdir = ovl_dentry_upper(old->d_parent); |
979 | new_upperdir = ovl_dentry_upper(new->d_parent); | |
980 | ||
ee1d6d37 AG |
981 | if (!samedir) { |
982 | /* | |
983 | * When moving a merge dir or non-dir with copy up origin into | |
f3a15685 AG |
984 | * a new parent, we are marking the new parent dir "impure". |
985 | * When ovl_iterate() iterates an "impure" upper dir, it will | |
986 | * lookup the origin inodes of the entries to fill d_ino. | |
ee1d6d37 | 987 | */ |
f3a15685 | 988 | if (ovl_type_origin(old)) { |
ee1d6d37 AG |
989 | err = ovl_set_impure(new->d_parent, new_upperdir); |
990 | if (err) | |
991 | goto out_revert_creds; | |
992 | } | |
f3a15685 | 993 | if (!overwrite && ovl_type_origin(new)) { |
ee1d6d37 AG |
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; | |
9020df37 | 1009 | if (!ovl_matches_upper(old, olddentry)) |
11f37104 MS |
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 | 1021 | err = -ESTALE; |
09d8b586 | 1022 | if (d_inode(new) && ovl_dentry_upper(new)) { |
e9be9d5e | 1023 | if (opaquedir) { |
11f37104 MS |
1024 | if (newdentry != opaquedir) |
1025 | goto out_dput; | |
e9be9d5e | 1026 | } else { |
9020df37 | 1027 | if (!ovl_matches_upper(new, newdentry)) |
11f37104 | 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 | ||
f681eb1d AG |
1070 | if (overwrite && d_inode(new)) { |
1071 | if (new_is_dir) | |
1072 | clear_nlink(d_inode(new)); | |
1073 | else | |
1074 | drop_nlink(d_inode(new)); | |
1075 | } | |
1076 | ||
f30536f0 AG |
1077 | ovl_dentry_version_inc(old->d_parent, ovl_type_origin(old) || |
1078 | (!overwrite && ovl_type_origin(new))); | |
1079 | ovl_dentry_version_inc(new->d_parent, ovl_type_origin(old) || | |
1080 | (d_inode(new) && ovl_type_origin(new))); | |
e9be9d5e MS |
1081 | |
1082 | out_dput: | |
1083 | dput(newdentry); | |
11f37104 MS |
1084 | out_dput_old: |
1085 | dput(olddentry); | |
e9be9d5e MS |
1086 | out_unlock: |
1087 | unlock_rename(new_upperdir, old_upperdir); | |
1088 | out_revert_creds: | |
1175b6b8 | 1089 | revert_creds(old_cred); |
5f8415d6 | 1090 | ovl_nlink_end(new, locked); |
e9be9d5e MS |
1091 | out_drop_write: |
1092 | ovl_drop_write(old); | |
1093 | out: | |
1094 | dput(opaquedir); | |
6d0a8a90 | 1095 | ovl_cache_free(&list); |
e9be9d5e MS |
1096 | return err; |
1097 | } | |
1098 | ||
1099 | const struct inode_operations ovl_dir_inode_operations = { | |
1100 | .lookup = ovl_lookup, | |
1101 | .mkdir = ovl_mkdir, | |
1102 | .symlink = ovl_symlink, | |
1103 | .unlink = ovl_unlink, | |
1104 | .rmdir = ovl_rmdir, | |
6c02cb59 | 1105 | .rename = ovl_rename, |
e9be9d5e MS |
1106 | .link = ovl_link, |
1107 | .setattr = ovl_setattr, | |
1108 | .create = ovl_create, | |
1109 | .mknod = ovl_mknod, | |
1110 | .permission = ovl_permission, | |
5b712091 | 1111 | .getattr = ovl_getattr, |
e9be9d5e | 1112 | .listxattr = ovl_listxattr, |
39a25b2b | 1113 | .get_acl = ovl_get_acl, |
d719e8f2 | 1114 | .update_time = ovl_update_time, |
e9be9d5e | 1115 | }; |