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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 */ | |
66 | static struct dentry *ovl_whiteout(struct dentry *workdir, | |
67 | struct dentry *dentry) | |
68 | { | |
69 | int err; | |
70 | struct dentry *whiteout; | |
71 | struct inode *wdir = workdir->d_inode; | |
72 | ||
3d27573c | 73 | whiteout = ovl_lookup_temp(workdir); |
e9be9d5e MS |
74 | if (IS_ERR(whiteout)) |
75 | return whiteout; | |
76 | ||
77 | err = ovl_do_whiteout(wdir, whiteout); | |
78 | if (err) { | |
79 | dput(whiteout); | |
80 | whiteout = ERR_PTR(err); | |
81 | } | |
82 | ||
83 | return whiteout; | |
84 | } | |
85 | ||
86 | int ovl_create_real(struct inode *dir, struct dentry *newdentry, | |
32a3d848 | 87 | struct cattr *attr, struct dentry *hardlink, bool debug) |
e9be9d5e MS |
88 | { |
89 | int err; | |
90 | ||
91 | if (newdentry->d_inode) | |
92 | return -ESTALE; | |
93 | ||
94 | if (hardlink) { | |
95 | err = ovl_do_link(hardlink, dir, newdentry, debug); | |
96 | } else { | |
32a3d848 | 97 | switch (attr->mode & S_IFMT) { |
e9be9d5e | 98 | case S_IFREG: |
32a3d848 | 99 | err = ovl_do_create(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
100 | break; |
101 | ||
102 | case S_IFDIR: | |
32a3d848 | 103 | err = ovl_do_mkdir(dir, newdentry, attr->mode, debug); |
e9be9d5e MS |
104 | break; |
105 | ||
106 | case S_IFCHR: | |
107 | case S_IFBLK: | |
108 | case S_IFIFO: | |
109 | case S_IFSOCK: | |
110 | err = ovl_do_mknod(dir, newdentry, | |
32a3d848 | 111 | attr->mode, attr->rdev, debug); |
e9be9d5e MS |
112 | break; |
113 | ||
114 | case S_IFLNK: | |
32a3d848 | 115 | err = ovl_do_symlink(dir, newdentry, attr->link, debug); |
e9be9d5e MS |
116 | break; |
117 | ||
118 | default: | |
119 | err = -EPERM; | |
120 | } | |
121 | } | |
122 | if (!err && WARN_ON(!newdentry->d_inode)) { | |
123 | /* | |
124 | * Not quite sure if non-instantiated dentry is legal or not. | |
125 | * VFS doesn't seem to care so check and warn here. | |
126 | */ | |
127 | err = -ENOENT; | |
128 | } | |
129 | return err; | |
130 | } | |
131 | ||
21a22878 AG |
132 | static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, |
133 | int xerr) | |
e9be9d5e | 134 | { |
5cf5b477 MS |
135 | int err; |
136 | ||
21a22878 | 137 | err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr); |
5cf5b477 MS |
138 | if (!err) |
139 | ovl_dentry_set_opaque(dentry); | |
140 | ||
141 | return err; | |
e9be9d5e MS |
142 | } |
143 | ||
21a22878 AG |
144 | static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry) |
145 | { | |
146 | /* | |
147 | * Fail with -EIO when trying to create opaque dir and upper doesn't | |
148 | * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to | |
149 | * return a specific error for noxattr case. | |
150 | */ | |
151 | return ovl_set_opaque_xerr(dentry, upperdentry, -EIO); | |
152 | } | |
153 | ||
72e48481 VG |
154 | /* Common operations required to be done after creation of file on upper */ |
155 | static void ovl_instantiate(struct dentry *dentry, struct inode *inode, | |
51f7e52d | 156 | struct dentry *newdentry, bool hardlink) |
72e48481 VG |
157 | { |
158 | ovl_dentry_version_inc(dentry->d_parent); | |
55acc661 | 159 | ovl_dentry_set_upper_alias(dentry); |
51f7e52d | 160 | if (!hardlink) { |
09d8b586 | 161 | ovl_inode_update(inode, newdentry); |
51f7e52d MS |
162 | ovl_copyattr(newdentry->d_inode, inode); |
163 | } else { | |
09d8b586 MS |
164 | WARN_ON(ovl_inode_real(inode) != d_inode(newdentry)); |
165 | dput(newdentry); | |
51f7e52d MS |
166 | inc_nlink(inode); |
167 | } | |
72e48481 | 168 | d_instantiate(dentry, inode); |
5b6c9053 AG |
169 | /* Force lookup of new upper hardlink to find its lower */ |
170 | if (hardlink) | |
171 | d_drop(dentry); | |
72e48481 VG |
172 | } |
173 | ||
97c684cc AG |
174 | static bool ovl_type_merge(struct dentry *dentry) |
175 | { | |
176 | return OVL_TYPE_MERGE(ovl_path_type(dentry)); | |
177 | } | |
178 | ||
ee1d6d37 AG |
179 | static bool ovl_type_origin(struct dentry *dentry) |
180 | { | |
181 | return OVL_TYPE_ORIGIN(ovl_path_type(dentry)); | |
182 | } | |
183 | ||
e9be9d5e | 184 | static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
32a3d848 | 185 | struct cattr *attr, struct dentry *hardlink) |
e9be9d5e MS |
186 | { |
187 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
188 | struct inode *udir = upperdir->d_inode; | |
189 | struct dentry *newdentry; | |
190 | int err; | |
191 | ||
38b25697 | 192 | if (!hardlink && !IS_POSIXACL(udir)) |
32a3d848 | 193 | attr->mode &= ~current_umask(); |
38b25697 | 194 | |
5955102c | 195 | inode_lock_nested(udir, I_MUTEX_PARENT); |
e9be9d5e MS |
196 | newdentry = lookup_one_len(dentry->d_name.name, upperdir, |
197 | dentry->d_name.len); | |
198 | err = PTR_ERR(newdentry); | |
199 | if (IS_ERR(newdentry)) | |
200 | goto out_unlock; | |
32a3d848 | 201 | err = ovl_create_real(udir, newdentry, attr, hardlink, false); |
e9be9d5e MS |
202 | if (err) |
203 | goto out_dput; | |
204 | ||
4a99f3c8 | 205 | if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
97c684cc AG |
206 | /* Setting opaque here is just an optimization, allow to fail */ |
207 | ovl_set_opaque(dentry, newdentry); | |
208 | } | |
209 | ||
51f7e52d | 210 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
211 | newdentry = NULL; |
212 | out_dput: | |
213 | dput(newdentry); | |
214 | out_unlock: | |
5955102c | 215 | inode_unlock(udir); |
e9be9d5e MS |
216 | return err; |
217 | } | |
218 | ||
219 | static int ovl_lock_rename_workdir(struct dentry *workdir, | |
220 | struct dentry *upperdir) | |
221 | { | |
222 | /* Workdir should not be the same as upperdir */ | |
223 | if (workdir == upperdir) | |
224 | goto err; | |
225 | ||
226 | /* Workdir should not be subdir of upperdir and vice versa */ | |
227 | if (lock_rename(workdir, upperdir) != NULL) | |
228 | goto err_unlock; | |
229 | ||
230 | return 0; | |
231 | ||
232 | err_unlock: | |
233 | unlock_rename(workdir, upperdir); | |
234 | err: | |
235 | pr_err("overlayfs: failed to lock workdir+upperdir\n"); | |
236 | return -EIO; | |
237 | } | |
238 | ||
239 | static struct dentry *ovl_clear_empty(struct dentry *dentry, | |
240 | struct list_head *list) | |
241 | { | |
242 | struct dentry *workdir = ovl_workdir(dentry); | |
243 | struct inode *wdir = workdir->d_inode; | |
244 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
245 | struct inode *udir = upperdir->d_inode; | |
246 | struct path upperpath; | |
247 | struct dentry *upper; | |
248 | struct dentry *opaquedir; | |
249 | struct kstat stat; | |
250 | int err; | |
251 | ||
cc6f67bc MS |
252 | if (WARN_ON(!workdir)) |
253 | return ERR_PTR(-EROFS); | |
254 | ||
e9be9d5e MS |
255 | err = ovl_lock_rename_workdir(workdir, upperdir); |
256 | if (err) | |
257 | goto out; | |
258 | ||
259 | ovl_path_upper(dentry, &upperpath); | |
a528d35e DH |
260 | err = vfs_getattr(&upperpath, &stat, |
261 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
262 | if (err) |
263 | goto out_unlock; | |
264 | ||
265 | err = -ESTALE; | |
266 | if (!S_ISDIR(stat.mode)) | |
267 | goto out_unlock; | |
268 | upper = upperpath.dentry; | |
269 | if (upper->d_parent->d_inode != udir) | |
270 | goto out_unlock; | |
271 | ||
3d27573c | 272 | opaquedir = ovl_lookup_temp(workdir); |
e9be9d5e MS |
273 | err = PTR_ERR(opaquedir); |
274 | if (IS_ERR(opaquedir)) | |
275 | goto out_unlock; | |
276 | ||
32a3d848 AV |
277 | err = ovl_create_real(wdir, opaquedir, |
278 | &(struct cattr){.mode = stat.mode}, NULL, true); | |
e9be9d5e MS |
279 | if (err) |
280 | goto out_dput; | |
281 | ||
282 | err = ovl_copy_xattr(upper, opaquedir); | |
283 | if (err) | |
284 | goto out_cleanup; | |
285 | ||
5cf5b477 | 286 | err = ovl_set_opaque(dentry, opaquedir); |
e9be9d5e MS |
287 | if (err) |
288 | goto out_cleanup; | |
289 | ||
5955102c | 290 | inode_lock(opaquedir->d_inode); |
e9be9d5e | 291 | err = ovl_set_attr(opaquedir, &stat); |
5955102c | 292 | inode_unlock(opaquedir->d_inode); |
e9be9d5e MS |
293 | if (err) |
294 | goto out_cleanup; | |
295 | ||
296 | err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); | |
297 | if (err) | |
298 | goto out_cleanup; | |
299 | ||
300 | ovl_cleanup_whiteouts(upper, list); | |
301 | ovl_cleanup(wdir, upper); | |
302 | unlock_rename(workdir, upperdir); | |
303 | ||
304 | /* dentry's upper doesn't match now, get rid of it */ | |
305 | d_drop(dentry); | |
306 | ||
307 | return opaquedir; | |
308 | ||
309 | out_cleanup: | |
310 | ovl_cleanup(wdir, opaquedir); | |
311 | out_dput: | |
312 | dput(opaquedir); | |
313 | out_unlock: | |
314 | unlock_rename(workdir, upperdir); | |
315 | out: | |
316 | return ERR_PTR(err); | |
317 | } | |
318 | ||
a105d685 | 319 | static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry) |
e9be9d5e MS |
320 | { |
321 | int err; | |
322 | struct dentry *ret = NULL; | |
30c17ebf | 323 | enum ovl_path_type type = ovl_path_type(dentry); |
e9be9d5e MS |
324 | LIST_HEAD(list); |
325 | ||
326 | err = ovl_check_empty_dir(dentry, &list); | |
30c17ebf | 327 | if (err) { |
e9be9d5e | 328 | ret = ERR_PTR(err); |
30c17ebf | 329 | goto out_free; |
a105d685 | 330 | } |
e9be9d5e | 331 | |
30c17ebf MS |
332 | /* |
333 | * When removing an empty opaque directory, then it makes no sense to | |
334 | * replace it with an exact replica of itself. | |
335 | * | |
336 | * If no upperdentry then skip clearing whiteouts. | |
337 | * | |
338 | * Can race with copy-up, since we don't hold the upperdir mutex. | |
339 | * Doesn't matter, since copy-up can't create a non-empty directory | |
340 | * from an empty one. | |
341 | */ | |
342 | if (OVL_TYPE_UPPER(type) && OVL_TYPE_MERGE(type)) | |
343 | ret = ovl_clear_empty(dentry, &list); | |
344 | ||
345 | out_free: | |
e9be9d5e MS |
346 | ovl_cache_free(&list); |
347 | ||
348 | return ret; | |
349 | } | |
350 | ||
38b25697 MS |
351 | static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, |
352 | const struct posix_acl *acl) | |
353 | { | |
354 | void *buffer; | |
355 | size_t size; | |
356 | int err; | |
357 | ||
358 | if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) | |
359 | return 0; | |
360 | ||
361 | size = posix_acl_to_xattr(NULL, acl, NULL, 0); | |
362 | buffer = kmalloc(size, GFP_KERNEL); | |
363 | if (!buffer) | |
364 | return -ENOMEM; | |
365 | ||
366 | size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
367 | err = size; | |
368 | if (err < 0) | |
369 | goto out_free; | |
370 | ||
371 | err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); | |
372 | out_free: | |
373 | kfree(buffer); | |
374 | return err; | |
375 | } | |
376 | ||
e9be9d5e | 377 | static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
32a3d848 | 378 | struct cattr *cattr, |
e9be9d5e MS |
379 | struct dentry *hardlink) |
380 | { | |
381 | struct dentry *workdir = ovl_workdir(dentry); | |
382 | struct inode *wdir = workdir->d_inode; | |
383 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
384 | struct inode *udir = upperdir->d_inode; | |
385 | struct dentry *upper; | |
386 | struct dentry *newdentry; | |
387 | int err; | |
38b25697 | 388 | struct posix_acl *acl, *default_acl; |
e9be9d5e | 389 | |
cc6f67bc MS |
390 | if (WARN_ON(!workdir)) |
391 | return -EROFS; | |
392 | ||
38b25697 MS |
393 | if (!hardlink) { |
394 | err = posix_acl_create(dentry->d_parent->d_inode, | |
32a3d848 | 395 | &cattr->mode, &default_acl, &acl); |
38b25697 MS |
396 | if (err) |
397 | return err; | |
398 | } | |
399 | ||
e9be9d5e MS |
400 | err = ovl_lock_rename_workdir(workdir, upperdir); |
401 | if (err) | |
402 | goto out; | |
403 | ||
3d27573c | 404 | newdentry = ovl_lookup_temp(workdir); |
e9be9d5e MS |
405 | err = PTR_ERR(newdentry); |
406 | if (IS_ERR(newdentry)) | |
407 | goto out_unlock; | |
408 | ||
409 | upper = lookup_one_len(dentry->d_name.name, upperdir, | |
410 | dentry->d_name.len); | |
411 | err = PTR_ERR(upper); | |
412 | if (IS_ERR(upper)) | |
413 | goto out_dput; | |
414 | ||
32a3d848 | 415 | err = ovl_create_real(wdir, newdentry, cattr, hardlink, true); |
e9be9d5e MS |
416 | if (err) |
417 | goto out_dput2; | |
418 | ||
bb0d2b8a MS |
419 | /* |
420 | * mode could have been mutilated due to umask (e.g. sgid directory) | |
421 | */ | |
51f7e52d | 422 | if (!hardlink && |
32a3d848 AV |
423 | !S_ISLNK(cattr->mode) && |
424 | newdentry->d_inode->i_mode != cattr->mode) { | |
bb0d2b8a MS |
425 | struct iattr attr = { |
426 | .ia_valid = ATTR_MODE, | |
32a3d848 | 427 | .ia_mode = cattr->mode, |
bb0d2b8a MS |
428 | }; |
429 | inode_lock(newdentry->d_inode); | |
430 | err = notify_change(newdentry, &attr, NULL); | |
431 | inode_unlock(newdentry->d_inode); | |
432 | if (err) | |
433 | goto out_cleanup; | |
434 | } | |
38b25697 MS |
435 | if (!hardlink) { |
436 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, | |
437 | acl); | |
438 | if (err) | |
439 | goto out_cleanup; | |
440 | ||
441 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, | |
442 | default_acl); | |
443 | if (err) | |
444 | goto out_cleanup; | |
445 | } | |
bb0d2b8a | 446 | |
32a3d848 | 447 | if (!hardlink && S_ISDIR(cattr->mode)) { |
5cf5b477 | 448 | err = ovl_set_opaque(dentry, newdentry); |
e9be9d5e MS |
449 | if (err) |
450 | goto out_cleanup; | |
451 | ||
452 | err = ovl_do_rename(wdir, newdentry, udir, upper, | |
453 | RENAME_EXCHANGE); | |
454 | if (err) | |
455 | goto out_cleanup; | |
456 | ||
457 | ovl_cleanup(wdir, upper); | |
458 | } else { | |
459 | err = ovl_do_rename(wdir, newdentry, udir, upper, 0); | |
460 | if (err) | |
461 | goto out_cleanup; | |
462 | } | |
51f7e52d | 463 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
464 | newdentry = NULL; |
465 | out_dput2: | |
466 | dput(upper); | |
467 | out_dput: | |
468 | dput(newdentry); | |
469 | out_unlock: | |
470 | unlock_rename(workdir, upperdir); | |
471 | out: | |
38b25697 MS |
472 | if (!hardlink) { |
473 | posix_acl_release(acl); | |
474 | posix_acl_release(default_acl); | |
475 | } | |
e9be9d5e MS |
476 | return err; |
477 | ||
478 | out_cleanup: | |
479 | ovl_cleanup(wdir, newdentry); | |
480 | goto out_dput2; | |
481 | } | |
482 | ||
51f7e52d | 483 | static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
ea3dad18 AG |
484 | struct cattr *attr, struct dentry *hardlink, |
485 | bool origin) | |
e9be9d5e MS |
486 | { |
487 | int err; | |
1175b6b8 VG |
488 | const struct cred *old_cred; |
489 | struct cred *override_cred; | |
ea3dad18 | 490 | struct dentry *parent = dentry->d_parent; |
e9be9d5e | 491 | |
ea3dad18 | 492 | err = ovl_copy_up(parent); |
e9be9d5e | 493 | if (err) |
51f7e52d | 494 | return err; |
bb0d2b8a | 495 | |
1175b6b8 | 496 | old_cred = ovl_override_creds(dentry->d_sb); |
ea3dad18 AG |
497 | |
498 | /* | |
499 | * When linking a file with copy up origin into a new parent, mark the | |
500 | * new parent dir "impure". | |
501 | */ | |
502 | if (origin) { | |
503 | err = ovl_set_impure(parent, ovl_dentry_upper(parent)); | |
504 | if (err) | |
505 | goto out_revert_creds; | |
506 | } | |
507 | ||
1175b6b8 VG |
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 | |
ea3dad18 | 566 | err = ovl_create_or_link(dentry, inode, &attr, NULL, false); |
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; | |
5f8415d6 | 607 | bool locked = false; |
51f7e52d | 608 | struct inode *inode; |
e9be9d5e MS |
609 | |
610 | err = ovl_want_write(old); | |
611 | if (err) | |
612 | goto out; | |
613 | ||
614 | err = ovl_copy_up(old); | |
615 | if (err) | |
616 | goto out_drop_write; | |
617 | ||
5f8415d6 AG |
618 | err = ovl_nlink_start(old, &locked); |
619 | if (err) | |
620 | goto out_drop_write; | |
621 | ||
51f7e52d MS |
622 | inode = d_inode(old); |
623 | ihold(inode); | |
624 | ||
ea3dad18 AG |
625 | err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old), |
626 | ovl_type_origin(old)); | |
51f7e52d MS |
627 | if (err) |
628 | iput(inode); | |
e9be9d5e | 629 | |
5f8415d6 | 630 | ovl_nlink_end(old, locked); |
e9be9d5e MS |
631 | out_drop_write: |
632 | ovl_drop_write(old); | |
633 | out: | |
634 | return err; | |
635 | } | |
636 | ||
9020df37 MS |
637 | static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper) |
638 | { | |
639 | return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper); | |
640 | } | |
641 | ||
a105d685 | 642 | static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir) |
e9be9d5e MS |
643 | { |
644 | struct dentry *workdir = ovl_workdir(dentry); | |
645 | struct inode *wdir = workdir->d_inode; | |
646 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
647 | struct inode *udir = upperdir->d_inode; | |
648 | struct dentry *whiteout; | |
649 | struct dentry *upper; | |
650 | struct dentry *opaquedir = NULL; | |
651 | int err; | |
cfc9fde0 | 652 | int flags = 0; |
e9be9d5e | 653 | |
cc6f67bc MS |
654 | if (WARN_ON(!workdir)) |
655 | return -EROFS; | |
656 | ||
d377c5eb | 657 | if (is_dir) { |
30c17ebf MS |
658 | opaquedir = ovl_check_empty_and_clear(dentry); |
659 | err = PTR_ERR(opaquedir); | |
660 | if (IS_ERR(opaquedir)) | |
661 | goto out; | |
e9be9d5e MS |
662 | } |
663 | ||
664 | err = ovl_lock_rename_workdir(workdir, upperdir); | |
665 | if (err) | |
666 | goto out_dput; | |
667 | ||
cfc9fde0 MP |
668 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
669 | dentry->d_name.len); | |
670 | err = PTR_ERR(upper); | |
671 | if (IS_ERR(upper)) | |
e9be9d5e MS |
672 | goto out_unlock; |
673 | ||
cfc9fde0 MP |
674 | err = -ESTALE; |
675 | if ((opaquedir && upper != opaquedir) || | |
676 | (!opaquedir && ovl_dentry_upper(dentry) && | |
9020df37 | 677 | !ovl_matches_upper(dentry, upper))) { |
cfc9fde0 MP |
678 | goto out_dput_upper; |
679 | } | |
e9be9d5e | 680 | |
cfc9fde0 MP |
681 | whiteout = ovl_whiteout(workdir, dentry); |
682 | err = PTR_ERR(whiteout); | |
683 | if (IS_ERR(whiteout)) | |
684 | goto out_dput_upper; | |
e9be9d5e | 685 | |
cfc9fde0 MP |
686 | if (d_is_dir(upper)) |
687 | flags = RENAME_EXCHANGE; | |
e9be9d5e | 688 | |
cfc9fde0 MP |
689 | err = ovl_do_rename(wdir, whiteout, udir, upper, flags); |
690 | if (err) | |
691 | goto kill_whiteout; | |
692 | if (flags) | |
693 | ovl_cleanup(wdir, upper); | |
e9be9d5e | 694 | |
e9be9d5e MS |
695 | ovl_dentry_version_inc(dentry->d_parent); |
696 | out_d_drop: | |
697 | d_drop(dentry); | |
698 | dput(whiteout); | |
cfc9fde0 MP |
699 | out_dput_upper: |
700 | dput(upper); | |
e9be9d5e MS |
701 | out_unlock: |
702 | unlock_rename(workdir, upperdir); | |
703 | out_dput: | |
704 | dput(opaquedir); | |
705 | out: | |
706 | return err; | |
707 | ||
708 | kill_whiteout: | |
709 | ovl_cleanup(wdir, whiteout); | |
710 | goto out_d_drop; | |
711 | } | |
712 | ||
713 | static int ovl_remove_upper(struct dentry *dentry, bool is_dir) | |
714 | { | |
715 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
716 | struct inode *dir = upperdir->d_inode; | |
11f37104 | 717 | struct dentry *upper; |
d1595119 | 718 | struct dentry *opaquedir = NULL; |
e9be9d5e MS |
719 | int err; |
720 | ||
d1595119 AG |
721 | /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */ |
722 | if (is_dir && ovl_dentry_get_redirect(dentry)) { | |
723 | opaquedir = ovl_check_empty_and_clear(dentry); | |
724 | err = PTR_ERR(opaquedir); | |
725 | if (IS_ERR(opaquedir)) | |
726 | goto out; | |
727 | } | |
728 | ||
5955102c | 729 | inode_lock_nested(dir, I_MUTEX_PARENT); |
11f37104 MS |
730 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
731 | dentry->d_name.len); | |
732 | err = PTR_ERR(upper); | |
733 | if (IS_ERR(upper)) | |
734 | goto out_unlock; | |
735 | ||
e9be9d5e | 736 | err = -ESTALE; |
d1595119 | 737 | if ((opaquedir && upper != opaquedir) || |
9020df37 | 738 | (!opaquedir && !ovl_matches_upper(dentry, upper))) |
d1595119 AG |
739 | goto out_dput_upper; |
740 | ||
741 | if (is_dir) | |
742 | err = vfs_rmdir(dir, upper); | |
743 | else | |
744 | err = vfs_unlink(dir, upper, NULL); | |
745 | ovl_dentry_version_inc(dentry->d_parent); | |
e9be9d5e MS |
746 | |
747 | /* | |
748 | * Keeping this dentry hashed would mean having to release | |
749 | * upperpath/lowerpath, which could only be done if we are the | |
750 | * sole user of this dentry. Too tricky... Just unhash for | |
751 | * now. | |
752 | */ | |
ce9113bb RW |
753 | if (!err) |
754 | d_drop(dentry); | |
d1595119 AG |
755 | out_dput_upper: |
756 | dput(upper); | |
11f37104 | 757 | out_unlock: |
5955102c | 758 | inode_unlock(dir); |
d1595119 AG |
759 | dput(opaquedir); |
760 | out: | |
e9be9d5e MS |
761 | return err; |
762 | } | |
763 | ||
e9be9d5e MS |
764 | static int ovl_do_remove(struct dentry *dentry, bool is_dir) |
765 | { | |
e9be9d5e | 766 | int err; |
5f8415d6 | 767 | bool locked = false; |
1175b6b8 VG |
768 | const struct cred *old_cred; |
769 | ||
e9be9d5e MS |
770 | err = ovl_want_write(dentry); |
771 | if (err) | |
772 | goto out; | |
773 | ||
774 | err = ovl_copy_up(dentry->d_parent); | |
775 | if (err) | |
776 | goto out_drop_write; | |
777 | ||
5f8415d6 AG |
778 | err = ovl_nlink_start(dentry, &locked); |
779 | if (err) | |
780 | goto out_drop_write; | |
e9be9d5e | 781 | |
1175b6b8 | 782 | old_cred = ovl_override_creds(dentry->d_sb); |
2aff4534 | 783 | if (!ovl_lower_positive(dentry)) |
1175b6b8 VG |
784 | err = ovl_remove_upper(dentry, is_dir); |
785 | else | |
a105d685 | 786 | err = ovl_remove_and_whiteout(dentry, is_dir); |
1175b6b8 | 787 | revert_creds(old_cred); |
dbc816d0 MS |
788 | if (!err) { |
789 | if (is_dir) | |
790 | clear_nlink(dentry->d_inode); | |
791 | else | |
792 | drop_nlink(dentry->d_inode); | |
793 | } | |
5f8415d6 | 794 | ovl_nlink_end(dentry, locked); |
e9be9d5e MS |
795 | out_drop_write: |
796 | ovl_drop_write(dentry); | |
797 | out: | |
798 | return err; | |
799 | } | |
800 | ||
801 | static int ovl_unlink(struct inode *dir, struct dentry *dentry) | |
802 | { | |
803 | return ovl_do_remove(dentry, false); | |
804 | } | |
805 | ||
806 | static int ovl_rmdir(struct inode *dir, struct dentry *dentry) | |
807 | { | |
808 | return ovl_do_remove(dentry, true); | |
809 | } | |
810 | ||
370e55ac MS |
811 | static bool ovl_type_merge_or_lower(struct dentry *dentry) |
812 | { | |
813 | enum ovl_path_type type = ovl_path_type(dentry); | |
814 | ||
815 | return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); | |
816 | } | |
817 | ||
a6c60655 MS |
818 | static bool ovl_can_move(struct dentry *dentry) |
819 | { | |
820 | return ovl_redirect_dir(dentry->d_sb) || | |
821 | !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry); | |
822 | } | |
823 | ||
a6c60655 MS |
824 | static char *ovl_get_redirect(struct dentry *dentry, bool samedir) |
825 | { | |
826 | char *buf, *ret; | |
827 | struct dentry *d, *tmp; | |
3ea22a71 | 828 | int buflen = ovl_redirect_max + 1; |
a6c60655 MS |
829 | |
830 | if (samedir) { | |
831 | ret = kstrndup(dentry->d_name.name, dentry->d_name.len, | |
832 | GFP_KERNEL); | |
833 | goto out; | |
834 | } | |
835 | ||
836 | buf = ret = kmalloc(buflen, GFP_TEMPORARY); | |
837 | if (!buf) | |
838 | goto out; | |
839 | ||
840 | buflen--; | |
841 | buf[buflen] = '\0'; | |
842 | for (d = dget(dentry); !IS_ROOT(d);) { | |
843 | const char *name; | |
844 | int thislen; | |
845 | ||
846 | spin_lock(&d->d_lock); | |
847 | name = ovl_dentry_get_redirect(d); | |
848 | if (name) { | |
849 | thislen = strlen(name); | |
850 | } else { | |
851 | name = d->d_name.name; | |
852 | thislen = d->d_name.len; | |
853 | } | |
854 | ||
855 | /* If path is too long, fall back to userspace move */ | |
856 | if (thislen + (name[0] != '/') > buflen) { | |
857 | ret = ERR_PTR(-EXDEV); | |
858 | spin_unlock(&d->d_lock); | |
859 | goto out_put; | |
860 | } | |
861 | ||
862 | buflen -= thislen; | |
863 | memcpy(&buf[buflen], name, thislen); | |
864 | tmp = dget_dlock(d->d_parent); | |
865 | spin_unlock(&d->d_lock); | |
866 | ||
867 | dput(d); | |
868 | d = tmp; | |
869 | ||
870 | /* Absolute redirect: finished */ | |
871 | if (buf[buflen] == '/') | |
872 | break; | |
873 | buflen--; | |
874 | buf[buflen] = '/'; | |
875 | } | |
876 | ret = kstrdup(&buf[buflen], GFP_KERNEL); | |
877 | out_put: | |
878 | dput(d); | |
879 | kfree(buf); | |
880 | out: | |
881 | return ret ? ret : ERR_PTR(-ENOMEM); | |
882 | } | |
883 | ||
884 | static int ovl_set_redirect(struct dentry *dentry, bool samedir) | |
885 | { | |
886 | int err; | |
887 | const char *redirect = ovl_dentry_get_redirect(dentry); | |
888 | ||
889 | if (redirect && (samedir || redirect[0] == '/')) | |
890 | return 0; | |
891 | ||
892 | redirect = ovl_get_redirect(dentry, samedir); | |
893 | if (IS_ERR(redirect)) | |
894 | return PTR_ERR(redirect); | |
895 | ||
21a22878 AG |
896 | err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry), |
897 | OVL_XATTR_REDIRECT, | |
898 | redirect, strlen(redirect), -EXDEV); | |
a6c60655 MS |
899 | if (!err) { |
900 | spin_lock(&dentry->d_lock); | |
901 | ovl_dentry_set_redirect(dentry, redirect); | |
902 | spin_unlock(&dentry->d_lock); | |
903 | } else { | |
904 | kfree(redirect); | |
21a22878 | 905 | pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err); |
a6c60655 MS |
906 | /* Fall back to userspace copy-up */ |
907 | err = -EXDEV; | |
908 | } | |
909 | return err; | |
910 | } | |
911 | ||
6c02cb59 MS |
912 | static int ovl_rename(struct inode *olddir, struct dentry *old, |
913 | struct inode *newdir, struct dentry *new, | |
914 | unsigned int flags) | |
e9be9d5e MS |
915 | { |
916 | int err; | |
5f8415d6 | 917 | bool locked = false; |
e9be9d5e MS |
918 | struct dentry *old_upperdir; |
919 | struct dentry *new_upperdir; | |
920 | struct dentry *olddentry; | |
921 | struct dentry *newdentry; | |
922 | struct dentry *trap; | |
923 | bool old_opaque; | |
924 | bool new_opaque; | |
e9be9d5e MS |
925 | bool cleanup_whiteout = false; |
926 | bool overwrite = !(flags & RENAME_EXCHANGE); | |
e36cb0b8 | 927 | bool is_dir = d_is_dir(old); |
370e55ac | 928 | bool new_is_dir = d_is_dir(new); |
a6c60655 | 929 | bool samedir = olddir == newdir; |
e9be9d5e MS |
930 | struct dentry *opaquedir = NULL; |
931 | const struct cred *old_cred = NULL; | |
e9be9d5e MS |
932 | |
933 | err = -EINVAL; | |
934 | if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) | |
935 | goto out; | |
936 | ||
937 | flags &= ~RENAME_NOREPLACE; | |
938 | ||
e9be9d5e | 939 | /* Don't copy up directory trees */ |
e9be9d5e | 940 | err = -EXDEV; |
a6c60655 | 941 | if (!ovl_can_move(old)) |
370e55ac | 942 | goto out; |
a6c60655 | 943 | if (!overwrite && !ovl_can_move(new)) |
e9be9d5e | 944 | goto out; |
e9be9d5e MS |
945 | |
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 | |
370e55ac | 969 | if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) { |
a105d685 | 970 | opaquedir = ovl_check_empty_and_clear(new); |
e9be9d5e MS |
971 | err = PTR_ERR(opaquedir); |
972 | if (IS_ERR(opaquedir)) { | |
973 | opaquedir = NULL; | |
974 | goto out_revert_creds; | |
975 | } | |
976 | } | |
977 | ||
978 | if (overwrite) { | |
2aff4534 | 979 | if (ovl_lower_positive(old)) { |
c412ce49 | 980 | if (!ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
981 | /* Whiteout source */ |
982 | flags |= RENAME_WHITEOUT; | |
983 | } else { | |
984 | /* Switch whiteouts */ | |
985 | flags |= RENAME_EXCHANGE; | |
986 | } | |
c412ce49 | 987 | } else if (is_dir && ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
988 | flags |= RENAME_EXCHANGE; |
989 | cleanup_whiteout = true; | |
990 | } | |
991 | } | |
992 | ||
993 | old_upperdir = ovl_dentry_upper(old->d_parent); | |
994 | new_upperdir = ovl_dentry_upper(new->d_parent); | |
995 | ||
ee1d6d37 AG |
996 | if (!samedir) { |
997 | /* | |
998 | * When moving a merge dir or non-dir with copy up origin into | |
f3a15685 AG |
999 | * a new parent, we are marking the new parent dir "impure". |
1000 | * When ovl_iterate() iterates an "impure" upper dir, it will | |
1001 | * lookup the origin inodes of the entries to fill d_ino. | |
ee1d6d37 | 1002 | */ |
f3a15685 | 1003 | if (ovl_type_origin(old)) { |
ee1d6d37 AG |
1004 | err = ovl_set_impure(new->d_parent, new_upperdir); |
1005 | if (err) | |
1006 | goto out_revert_creds; | |
1007 | } | |
f3a15685 | 1008 | if (!overwrite && ovl_type_origin(new)) { |
ee1d6d37 AG |
1009 | err = ovl_set_impure(old->d_parent, old_upperdir); |
1010 | if (err) | |
1011 | goto out_revert_creds; | |
1012 | } | |
1013 | } | |
1014 | ||
e9be9d5e MS |
1015 | trap = lock_rename(new_upperdir, old_upperdir); |
1016 | ||
11f37104 MS |
1017 | olddentry = lookup_one_len(old->d_name.name, old_upperdir, |
1018 | old->d_name.len); | |
1019 | err = PTR_ERR(olddentry); | |
1020 | if (IS_ERR(olddentry)) | |
1021 | goto out_unlock; | |
1022 | ||
1023 | err = -ESTALE; | |
9020df37 | 1024 | if (!ovl_matches_upper(old, olddentry)) |
11f37104 MS |
1025 | goto out_dput_old; |
1026 | ||
1027 | newdentry = lookup_one_len(new->d_name.name, new_upperdir, | |
1028 | new->d_name.len); | |
1029 | err = PTR_ERR(newdentry); | |
1030 | if (IS_ERR(newdentry)) | |
1031 | goto out_dput_old; | |
1032 | ||
3ee23ff1 MS |
1033 | old_opaque = ovl_dentry_is_opaque(old); |
1034 | new_opaque = ovl_dentry_is_opaque(new); | |
1035 | ||
11f37104 | 1036 | err = -ESTALE; |
09d8b586 | 1037 | if (d_inode(new) && ovl_dentry_upper(new)) { |
e9be9d5e | 1038 | if (opaquedir) { |
11f37104 MS |
1039 | if (newdentry != opaquedir) |
1040 | goto out_dput; | |
e9be9d5e | 1041 | } else { |
9020df37 | 1042 | if (!ovl_matches_upper(new, newdentry)) |
11f37104 | 1043 | goto out_dput; |
e9be9d5e MS |
1044 | } |
1045 | } else { | |
11f37104 MS |
1046 | if (!d_is_negative(newdentry) && |
1047 | (!new_opaque || !ovl_is_whiteout(newdentry))) | |
1048 | goto out_dput; | |
e9be9d5e MS |
1049 | } |
1050 | ||
e9be9d5e MS |
1051 | if (olddentry == trap) |
1052 | goto out_dput; | |
1053 | if (newdentry == trap) | |
1054 | goto out_dput; | |
1055 | ||
804032fa MS |
1056 | if (WARN_ON(olddentry->d_inode == newdentry->d_inode)) |
1057 | goto out_dput; | |
1058 | ||
5cf5b477 | 1059 | err = 0; |
a6c60655 | 1060 | if (is_dir) { |
5cf5b477 | 1061 | if (ovl_type_merge_or_lower(old)) |
a6c60655 | 1062 | err = ovl_set_redirect(old, samedir); |
97c684cc | 1063 | else if (!old_opaque && ovl_type_merge(new->d_parent)) |
21a22878 | 1064 | err = ovl_set_opaque_xerr(old, olddentry, -EXDEV); |
5cf5b477 MS |
1065 | if (err) |
1066 | goto out_dput; | |
e9be9d5e | 1067 | } |
a6c60655 | 1068 | if (!overwrite && new_is_dir) { |
5cf5b477 | 1069 | if (ovl_type_merge_or_lower(new)) |
a6c60655 | 1070 | err = ovl_set_redirect(new, samedir); |
97c684cc | 1071 | else if (!new_opaque && ovl_type_merge(old->d_parent)) |
21a22878 | 1072 | err = ovl_set_opaque_xerr(new, newdentry, -EXDEV); |
5cf5b477 MS |
1073 | if (err) |
1074 | goto out_dput; | |
e9be9d5e MS |
1075 | } |
1076 | ||
3ee23ff1 MS |
1077 | err = ovl_do_rename(old_upperdir->d_inode, olddentry, |
1078 | new_upperdir->d_inode, newdentry, flags); | |
1079 | if (err) | |
e9be9d5e | 1080 | goto out_dput; |
e9be9d5e MS |
1081 | |
1082 | if (cleanup_whiteout) | |
1083 | ovl_cleanup(old_upperdir->d_inode, newdentry); | |
1084 | ||
f681eb1d AG |
1085 | if (overwrite && d_inode(new)) { |
1086 | if (new_is_dir) | |
1087 | clear_nlink(d_inode(new)); | |
1088 | else | |
1089 | drop_nlink(d_inode(new)); | |
1090 | } | |
1091 | ||
e9be9d5e MS |
1092 | ovl_dentry_version_inc(old->d_parent); |
1093 | ovl_dentry_version_inc(new->d_parent); | |
1094 | ||
1095 | out_dput: | |
1096 | dput(newdentry); | |
11f37104 MS |
1097 | out_dput_old: |
1098 | dput(olddentry); | |
e9be9d5e MS |
1099 | out_unlock: |
1100 | unlock_rename(new_upperdir, old_upperdir); | |
1101 | out_revert_creds: | |
1175b6b8 | 1102 | revert_creds(old_cred); |
5f8415d6 | 1103 | ovl_nlink_end(new, locked); |
e9be9d5e MS |
1104 | out_drop_write: |
1105 | ovl_drop_write(old); | |
1106 | out: | |
1107 | dput(opaquedir); | |
1108 | return err; | |
1109 | } | |
1110 | ||
1111 | const struct inode_operations ovl_dir_inode_operations = { | |
1112 | .lookup = ovl_lookup, | |
1113 | .mkdir = ovl_mkdir, | |
1114 | .symlink = ovl_symlink, | |
1115 | .unlink = ovl_unlink, | |
1116 | .rmdir = ovl_rmdir, | |
6c02cb59 | 1117 | .rename = ovl_rename, |
e9be9d5e MS |
1118 | .link = ovl_link, |
1119 | .setattr = ovl_setattr, | |
1120 | .create = ovl_create, | |
1121 | .mknod = ovl_mknod, | |
1122 | .permission = ovl_permission, | |
5b712091 | 1123 | .getattr = ovl_getattr, |
e9be9d5e | 1124 | .listxattr = ovl_listxattr, |
39a25b2b | 1125 | .get_acl = ovl_get_acl, |
d719e8f2 | 1126 | .update_time = ovl_update_time, |
e9be9d5e | 1127 | }; |