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 | 157 | { |
4edb83bb | 158 | ovl_dentry_version_inc(dentry->d_parent, false); |
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 | ||
07f6fff1 | 184 | static bool ovl_may_have_whiteouts(struct dentry *dentry) |
185 | { | |
186 | return ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry)); | |
187 | } | |
188 | ||
e9be9d5e | 189 | static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
32a3d848 | 190 | struct cattr *attr, struct dentry *hardlink) |
e9be9d5e MS |
191 | { |
192 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
193 | struct inode *udir = upperdir->d_inode; | |
194 | struct dentry *newdentry; | |
195 | int err; | |
196 | ||
38b25697 | 197 | if (!hardlink && !IS_POSIXACL(udir)) |
32a3d848 | 198 | attr->mode &= ~current_umask(); |
38b25697 | 199 | |
5955102c | 200 | inode_lock_nested(udir, I_MUTEX_PARENT); |
e9be9d5e MS |
201 | newdentry = lookup_one_len(dentry->d_name.name, upperdir, |
202 | dentry->d_name.len); | |
203 | err = PTR_ERR(newdentry); | |
204 | if (IS_ERR(newdentry)) | |
205 | goto out_unlock; | |
32a3d848 | 206 | err = ovl_create_real(udir, newdentry, attr, hardlink, false); |
e9be9d5e MS |
207 | if (err) |
208 | goto out_dput; | |
209 | ||
4a99f3c8 | 210 | if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
97c684cc AG |
211 | /* Setting opaque here is just an optimization, allow to fail */ |
212 | ovl_set_opaque(dentry, newdentry); | |
213 | } | |
214 | ||
51f7e52d | 215 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
216 | newdentry = NULL; |
217 | out_dput: | |
218 | dput(newdentry); | |
219 | out_unlock: | |
5955102c | 220 | inode_unlock(udir); |
e9be9d5e MS |
221 | return err; |
222 | } | |
223 | ||
e9be9d5e MS |
224 | static struct dentry *ovl_clear_empty(struct dentry *dentry, |
225 | struct list_head *list) | |
226 | { | |
227 | struct dentry *workdir = ovl_workdir(dentry); | |
228 | struct inode *wdir = workdir->d_inode; | |
229 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
230 | struct inode *udir = upperdir->d_inode; | |
231 | struct path upperpath; | |
232 | struct dentry *upper; | |
233 | struct dentry *opaquedir; | |
234 | struct kstat stat; | |
235 | int err; | |
236 | ||
cc6f67bc MS |
237 | if (WARN_ON(!workdir)) |
238 | return ERR_PTR(-EROFS); | |
239 | ||
e9be9d5e MS |
240 | err = ovl_lock_rename_workdir(workdir, upperdir); |
241 | if (err) | |
242 | goto out; | |
243 | ||
244 | ovl_path_upper(dentry, &upperpath); | |
a528d35e DH |
245 | err = vfs_getattr(&upperpath, &stat, |
246 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
247 | if (err) |
248 | goto out_unlock; | |
249 | ||
250 | err = -ESTALE; | |
251 | if (!S_ISDIR(stat.mode)) | |
252 | goto out_unlock; | |
253 | upper = upperpath.dentry; | |
254 | if (upper->d_parent->d_inode != udir) | |
255 | goto out_unlock; | |
256 | ||
3d27573c | 257 | opaquedir = ovl_lookup_temp(workdir); |
e9be9d5e MS |
258 | err = PTR_ERR(opaquedir); |
259 | if (IS_ERR(opaquedir)) | |
260 | goto out_unlock; | |
261 | ||
32a3d848 AV |
262 | err = ovl_create_real(wdir, opaquedir, |
263 | &(struct cattr){.mode = stat.mode}, NULL, true); | |
e9be9d5e MS |
264 | if (err) |
265 | goto out_dput; | |
266 | ||
267 | err = ovl_copy_xattr(upper, opaquedir); | |
268 | if (err) | |
269 | goto out_cleanup; | |
270 | ||
5cf5b477 | 271 | err = ovl_set_opaque(dentry, opaquedir); |
e9be9d5e MS |
272 | if (err) |
273 | goto out_cleanup; | |
274 | ||
5955102c | 275 | inode_lock(opaquedir->d_inode); |
e9be9d5e | 276 | err = ovl_set_attr(opaquedir, &stat); |
5955102c | 277 | inode_unlock(opaquedir->d_inode); |
e9be9d5e MS |
278 | if (err) |
279 | goto out_cleanup; | |
280 | ||
281 | err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); | |
282 | if (err) | |
283 | goto out_cleanup; | |
284 | ||
285 | ovl_cleanup_whiteouts(upper, list); | |
286 | ovl_cleanup(wdir, upper); | |
287 | unlock_rename(workdir, upperdir); | |
288 | ||
289 | /* dentry's upper doesn't match now, get rid of it */ | |
290 | d_drop(dentry); | |
291 | ||
292 | return opaquedir; | |
293 | ||
294 | out_cleanup: | |
295 | ovl_cleanup(wdir, opaquedir); | |
296 | out_dput: | |
297 | dput(opaquedir); | |
298 | out_unlock: | |
299 | unlock_rename(workdir, upperdir); | |
300 | out: | |
301 | return ERR_PTR(err); | |
302 | } | |
303 | ||
a105d685 | 304 | static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry) |
e9be9d5e MS |
305 | { |
306 | int err; | |
307 | struct dentry *ret = NULL; | |
308 | LIST_HEAD(list); | |
309 | ||
310 | err = ovl_check_empty_dir(dentry, &list); | |
30c17ebf | 311 | if (err) { |
e9be9d5e | 312 | ret = ERR_PTR(err); |
30c17ebf | 313 | goto out_free; |
a105d685 | 314 | } |
e9be9d5e | 315 | |
30c17ebf MS |
316 | /* |
317 | * When removing an empty opaque directory, then it makes no sense to | |
318 | * replace it with an exact replica of itself. | |
319 | * | |
95e598e7 | 320 | * If upperdentry has whiteouts, clear them. |
30c17ebf MS |
321 | * |
322 | * Can race with copy-up, since we don't hold the upperdir mutex. | |
323 | * Doesn't matter, since copy-up can't create a non-empty directory | |
324 | * from an empty one. | |
325 | */ | |
95e598e7 | 326 | if (!list_empty(&list)) |
30c17ebf MS |
327 | ret = ovl_clear_empty(dentry, &list); |
328 | ||
329 | out_free: | |
e9be9d5e MS |
330 | ovl_cache_free(&list); |
331 | ||
332 | return ret; | |
333 | } | |
334 | ||
38b25697 MS |
335 | static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, |
336 | const struct posix_acl *acl) | |
337 | { | |
338 | void *buffer; | |
339 | size_t size; | |
340 | int err; | |
341 | ||
342 | if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) | |
343 | return 0; | |
344 | ||
345 | size = posix_acl_to_xattr(NULL, acl, NULL, 0); | |
346 | buffer = kmalloc(size, GFP_KERNEL); | |
347 | if (!buffer) | |
348 | return -ENOMEM; | |
349 | ||
350 | size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
351 | err = size; | |
352 | if (err < 0) | |
353 | goto out_free; | |
354 | ||
355 | err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); | |
356 | out_free: | |
357 | kfree(buffer); | |
358 | return err; | |
359 | } | |
360 | ||
e9be9d5e | 361 | static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
32a3d848 | 362 | struct cattr *cattr, |
e9be9d5e MS |
363 | struct dentry *hardlink) |
364 | { | |
365 | struct dentry *workdir = ovl_workdir(dentry); | |
366 | struct inode *wdir = workdir->d_inode; | |
367 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
368 | struct inode *udir = upperdir->d_inode; | |
369 | struct dentry *upper; | |
370 | struct dentry *newdentry; | |
371 | int err; | |
38b25697 | 372 | struct posix_acl *acl, *default_acl; |
e9be9d5e | 373 | |
cc6f67bc MS |
374 | if (WARN_ON(!workdir)) |
375 | return -EROFS; | |
376 | ||
38b25697 MS |
377 | if (!hardlink) { |
378 | err = posix_acl_create(dentry->d_parent->d_inode, | |
32a3d848 | 379 | &cattr->mode, &default_acl, &acl); |
38b25697 MS |
380 | if (err) |
381 | return err; | |
382 | } | |
383 | ||
e9be9d5e MS |
384 | err = ovl_lock_rename_workdir(workdir, upperdir); |
385 | if (err) | |
386 | goto out; | |
387 | ||
3d27573c | 388 | newdentry = ovl_lookup_temp(workdir); |
e9be9d5e MS |
389 | err = PTR_ERR(newdentry); |
390 | if (IS_ERR(newdentry)) | |
391 | goto out_unlock; | |
392 | ||
393 | upper = lookup_one_len(dentry->d_name.name, upperdir, | |
394 | dentry->d_name.len); | |
395 | err = PTR_ERR(upper); | |
396 | if (IS_ERR(upper)) | |
397 | goto out_dput; | |
398 | ||
32a3d848 | 399 | err = ovl_create_real(wdir, newdentry, cattr, hardlink, true); |
e9be9d5e MS |
400 | if (err) |
401 | goto out_dput2; | |
402 | ||
bb0d2b8a MS |
403 | /* |
404 | * mode could have been mutilated due to umask (e.g. sgid directory) | |
405 | */ | |
51f7e52d | 406 | if (!hardlink && |
32a3d848 AV |
407 | !S_ISLNK(cattr->mode) && |
408 | newdentry->d_inode->i_mode != cattr->mode) { | |
bb0d2b8a MS |
409 | struct iattr attr = { |
410 | .ia_valid = ATTR_MODE, | |
32a3d848 | 411 | .ia_mode = cattr->mode, |
bb0d2b8a MS |
412 | }; |
413 | inode_lock(newdentry->d_inode); | |
414 | err = notify_change(newdentry, &attr, NULL); | |
415 | inode_unlock(newdentry->d_inode); | |
416 | if (err) | |
417 | goto out_cleanup; | |
418 | } | |
38b25697 MS |
419 | if (!hardlink) { |
420 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, | |
421 | acl); | |
422 | if (err) | |
423 | goto out_cleanup; | |
424 | ||
425 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, | |
426 | default_acl); | |
427 | if (err) | |
428 | goto out_cleanup; | |
429 | } | |
bb0d2b8a | 430 | |
32a3d848 | 431 | if (!hardlink && S_ISDIR(cattr->mode)) { |
5cf5b477 | 432 | err = ovl_set_opaque(dentry, newdentry); |
e9be9d5e MS |
433 | if (err) |
434 | goto out_cleanup; | |
435 | ||
436 | err = ovl_do_rename(wdir, newdentry, udir, upper, | |
437 | RENAME_EXCHANGE); | |
438 | if (err) | |
439 | goto out_cleanup; | |
440 | ||
441 | ovl_cleanup(wdir, upper); | |
442 | } else { | |
443 | err = ovl_do_rename(wdir, newdentry, udir, upper, 0); | |
444 | if (err) | |
445 | goto out_cleanup; | |
446 | } | |
51f7e52d | 447 | ovl_instantiate(dentry, inode, newdentry, !!hardlink); |
e9be9d5e MS |
448 | newdentry = NULL; |
449 | out_dput2: | |
450 | dput(upper); | |
451 | out_dput: | |
452 | dput(newdentry); | |
453 | out_unlock: | |
454 | unlock_rename(workdir, upperdir); | |
455 | out: | |
38b25697 MS |
456 | if (!hardlink) { |
457 | posix_acl_release(acl); | |
458 | posix_acl_release(default_acl); | |
459 | } | |
e9be9d5e MS |
460 | return err; |
461 | ||
462 | out_cleanup: | |
463 | ovl_cleanup(wdir, newdentry); | |
464 | goto out_dput2; | |
465 | } | |
466 | ||
51f7e52d | 467 | static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
ea3dad18 AG |
468 | struct cattr *attr, struct dentry *hardlink, |
469 | bool origin) | |
e9be9d5e MS |
470 | { |
471 | int err; | |
1175b6b8 VG |
472 | const struct cred *old_cred; |
473 | struct cred *override_cred; | |
ea3dad18 | 474 | struct dentry *parent = dentry->d_parent; |
e9be9d5e | 475 | |
ea3dad18 | 476 | err = ovl_copy_up(parent); |
e9be9d5e | 477 | if (err) |
51f7e52d | 478 | return err; |
bb0d2b8a | 479 | |
1175b6b8 | 480 | old_cred = ovl_override_creds(dentry->d_sb); |
ea3dad18 AG |
481 | |
482 | /* | |
483 | * When linking a file with copy up origin into a new parent, mark the | |
484 | * new parent dir "impure". | |
485 | */ | |
486 | if (origin) { | |
487 | err = ovl_set_impure(parent, ovl_dentry_upper(parent)); | |
488 | if (err) | |
489 | goto out_revert_creds; | |
490 | } | |
491 | ||
1175b6b8 VG |
492 | err = -ENOMEM; |
493 | override_cred = prepare_creds(); | |
494 | if (override_cred) { | |
bb0d2b8a MS |
495 | override_cred->fsuid = inode->i_uid; |
496 | override_cred->fsgid = inode->i_gid; | |
2602625b VG |
497 | if (!hardlink) { |
498 | err = security_dentry_create_files_as(dentry, | |
32a3d848 | 499 | attr->mode, &dentry->d_name, old_cred, |
2602625b VG |
500 | override_cred); |
501 | if (err) { | |
502 | put_cred(override_cred); | |
503 | goto out_revert_creds; | |
504 | } | |
505 | } | |
1175b6b8 VG |
506 | put_cred(override_creds(override_cred)); |
507 | put_cred(override_cred); | |
508 | ||
c412ce49 | 509 | if (!ovl_dentry_is_whiteout(dentry)) |
32a3d848 | 510 | err = ovl_create_upper(dentry, inode, attr, |
1175b6b8 VG |
511 | hardlink); |
512 | else | |
32a3d848 AV |
513 | err = ovl_create_over_whiteout(dentry, inode, attr, |
514 | hardlink); | |
e9be9d5e | 515 | } |
2602625b | 516 | out_revert_creds: |
1175b6b8 | 517 | revert_creds(old_cred); |
bb0d2b8a MS |
518 | if (!err) { |
519 | struct inode *realinode = d_inode(ovl_dentry_upper(dentry)); | |
520 | ||
521 | WARN_ON(inode->i_mode != realinode->i_mode); | |
522 | WARN_ON(!uid_eq(inode->i_uid, realinode->i_uid)); | |
523 | WARN_ON(!gid_eq(inode->i_gid, realinode->i_gid)); | |
bb0d2b8a | 524 | } |
e9be9d5e MS |
525 | return err; |
526 | } | |
527 | ||
528 | static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev, | |
529 | const char *link) | |
530 | { | |
531 | int err; | |
51f7e52d | 532 | struct inode *inode; |
32a3d848 | 533 | struct cattr attr = { |
51f7e52d | 534 | .rdev = rdev, |
32a3d848 | 535 | .link = link, |
51f7e52d | 536 | }; |
e9be9d5e MS |
537 | |
538 | err = ovl_want_write(dentry); | |
51f7e52d MS |
539 | if (err) |
540 | goto out; | |
541 | ||
542 | err = -ENOMEM; | |
ca4c8a3a | 543 | inode = ovl_new_inode(dentry->d_sb, mode, rdev); |
51f7e52d MS |
544 | if (!inode) |
545 | goto out_drop_write; | |
546 | ||
547 | inode_init_owner(inode, dentry->d_parent->d_inode, mode); | |
32a3d848 | 548 | attr.mode = inode->i_mode; |
51f7e52d | 549 | |
ea3dad18 | 550 | err = ovl_create_or_link(dentry, inode, &attr, NULL, false); |
51f7e52d MS |
551 | if (err) |
552 | iput(inode); | |
e9be9d5e | 553 | |
51f7e52d MS |
554 | out_drop_write: |
555 | ovl_drop_write(dentry); | |
556 | out: | |
e9be9d5e MS |
557 | return err; |
558 | } | |
559 | ||
560 | static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
561 | bool excl) | |
562 | { | |
563 | return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL); | |
564 | } | |
565 | ||
566 | static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
567 | { | |
568 | return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL); | |
569 | } | |
570 | ||
571 | static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, | |
572 | dev_t rdev) | |
573 | { | |
574 | /* Don't allow creation of "whiteout" on overlay */ | |
575 | if (S_ISCHR(mode) && rdev == WHITEOUT_DEV) | |
576 | return -EPERM; | |
577 | ||
578 | return ovl_create_object(dentry, mode, rdev, NULL); | |
579 | } | |
580 | ||
581 | static int ovl_symlink(struct inode *dir, struct dentry *dentry, | |
582 | const char *link) | |
583 | { | |
584 | return ovl_create_object(dentry, S_IFLNK, 0, link); | |
585 | } | |
586 | ||
587 | static int ovl_link(struct dentry *old, struct inode *newdir, | |
588 | struct dentry *new) | |
589 | { | |
590 | int err; | |
5f8415d6 | 591 | bool locked = false; |
51f7e52d | 592 | struct inode *inode; |
e9be9d5e MS |
593 | |
594 | err = ovl_want_write(old); | |
595 | if (err) | |
596 | goto out; | |
597 | ||
598 | err = ovl_copy_up(old); | |
599 | if (err) | |
600 | goto out_drop_write; | |
601 | ||
5f8415d6 AG |
602 | err = ovl_nlink_start(old, &locked); |
603 | if (err) | |
604 | goto out_drop_write; | |
605 | ||
51f7e52d MS |
606 | inode = d_inode(old); |
607 | ihold(inode); | |
608 | ||
ea3dad18 AG |
609 | err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old), |
610 | ovl_type_origin(old)); | |
51f7e52d MS |
611 | if (err) |
612 | iput(inode); | |
e9be9d5e | 613 | |
5f8415d6 | 614 | ovl_nlink_end(old, locked); |
e9be9d5e MS |
615 | out_drop_write: |
616 | ovl_drop_write(old); | |
617 | out: | |
618 | return err; | |
619 | } | |
620 | ||
9020df37 MS |
621 | static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper) |
622 | { | |
623 | return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper); | |
624 | } | |
625 | ||
a105d685 | 626 | static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir) |
e9be9d5e MS |
627 | { |
628 | struct dentry *workdir = ovl_workdir(dentry); | |
629 | struct inode *wdir = workdir->d_inode; | |
630 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
631 | struct inode *udir = upperdir->d_inode; | |
632 | struct dentry *whiteout; | |
633 | struct dentry *upper; | |
634 | struct dentry *opaquedir = NULL; | |
635 | int err; | |
cfc9fde0 | 636 | int flags = 0; |
e9be9d5e | 637 | |
cc6f67bc MS |
638 | if (WARN_ON(!workdir)) |
639 | return -EROFS; | |
640 | ||
d377c5eb | 641 | if (is_dir) { |
30c17ebf MS |
642 | opaquedir = ovl_check_empty_and_clear(dentry); |
643 | err = PTR_ERR(opaquedir); | |
644 | if (IS_ERR(opaquedir)) | |
645 | goto out; | |
e9be9d5e MS |
646 | } |
647 | ||
648 | err = ovl_lock_rename_workdir(workdir, upperdir); | |
649 | if (err) | |
650 | goto out_dput; | |
651 | ||
cfc9fde0 MP |
652 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
653 | dentry->d_name.len); | |
654 | err = PTR_ERR(upper); | |
655 | if (IS_ERR(upper)) | |
e9be9d5e MS |
656 | goto out_unlock; |
657 | ||
cfc9fde0 MP |
658 | err = -ESTALE; |
659 | if ((opaquedir && upper != opaquedir) || | |
660 | (!opaquedir && ovl_dentry_upper(dentry) && | |
9020df37 | 661 | !ovl_matches_upper(dentry, upper))) { |
cfc9fde0 MP |
662 | goto out_dput_upper; |
663 | } | |
e9be9d5e | 664 | |
cfc9fde0 MP |
665 | whiteout = ovl_whiteout(workdir, dentry); |
666 | err = PTR_ERR(whiteout); | |
667 | if (IS_ERR(whiteout)) | |
668 | goto out_dput_upper; | |
e9be9d5e | 669 | |
cfc9fde0 MP |
670 | if (d_is_dir(upper)) |
671 | flags = RENAME_EXCHANGE; | |
e9be9d5e | 672 | |
cfc9fde0 MP |
673 | err = ovl_do_rename(wdir, whiteout, udir, upper, flags); |
674 | if (err) | |
675 | goto kill_whiteout; | |
676 | if (flags) | |
677 | ovl_cleanup(wdir, upper); | |
e9be9d5e | 678 | |
4edb83bb | 679 | ovl_dentry_version_inc(dentry->d_parent, true); |
e9be9d5e MS |
680 | out_d_drop: |
681 | d_drop(dentry); | |
682 | dput(whiteout); | |
cfc9fde0 MP |
683 | out_dput_upper: |
684 | dput(upper); | |
e9be9d5e MS |
685 | out_unlock: |
686 | unlock_rename(workdir, upperdir); | |
687 | out_dput: | |
688 | dput(opaquedir); | |
689 | out: | |
690 | return err; | |
691 | ||
692 | kill_whiteout: | |
693 | ovl_cleanup(wdir, whiteout); | |
694 | goto out_d_drop; | |
695 | } | |
696 | ||
697 | static int ovl_remove_upper(struct dentry *dentry, bool is_dir) | |
698 | { | |
699 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
700 | struct inode *dir = upperdir->d_inode; | |
11f37104 | 701 | struct dentry *upper; |
d1595119 | 702 | struct dentry *opaquedir = NULL; |
e9be9d5e MS |
703 | int err; |
704 | ||
07f6fff1 | 705 | /* Redirect/origin dir can be !ovl_lower_positive && not clean */ |
706 | if (is_dir && (ovl_dentry_get_redirect(dentry) || | |
707 | ovl_may_have_whiteouts(dentry))) { | |
d1595119 AG |
708 | opaquedir = ovl_check_empty_and_clear(dentry); |
709 | err = PTR_ERR(opaquedir); | |
710 | if (IS_ERR(opaquedir)) | |
711 | goto out; | |
712 | } | |
713 | ||
5955102c | 714 | inode_lock_nested(dir, I_MUTEX_PARENT); |
11f37104 MS |
715 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
716 | dentry->d_name.len); | |
717 | err = PTR_ERR(upper); | |
718 | if (IS_ERR(upper)) | |
719 | goto out_unlock; | |
720 | ||
e9be9d5e | 721 | err = -ESTALE; |
d1595119 | 722 | if ((opaquedir && upper != opaquedir) || |
9020df37 | 723 | (!opaquedir && !ovl_matches_upper(dentry, upper))) |
d1595119 AG |
724 | goto out_dput_upper; |
725 | ||
726 | if (is_dir) | |
727 | err = vfs_rmdir(dir, upper); | |
728 | else | |
729 | err = vfs_unlink(dir, upper, NULL); | |
4edb83bb | 730 | ovl_dentry_version_inc(dentry->d_parent, ovl_type_origin(dentry)); |
e9be9d5e MS |
731 | |
732 | /* | |
733 | * Keeping this dentry hashed would mean having to release | |
734 | * upperpath/lowerpath, which could only be done if we are the | |
735 | * sole user of this dentry. Too tricky... Just unhash for | |
736 | * now. | |
737 | */ | |
ce9113bb RW |
738 | if (!err) |
739 | d_drop(dentry); | |
d1595119 AG |
740 | out_dput_upper: |
741 | dput(upper); | |
11f37104 | 742 | out_unlock: |
5955102c | 743 | inode_unlock(dir); |
d1595119 AG |
744 | dput(opaquedir); |
745 | out: | |
e9be9d5e MS |
746 | return err; |
747 | } | |
748 | ||
e9be9d5e MS |
749 | static int ovl_do_remove(struct dentry *dentry, bool is_dir) |
750 | { | |
e9be9d5e | 751 | int err; |
5f8415d6 | 752 | bool locked = false; |
1175b6b8 VG |
753 | const struct cred *old_cred; |
754 | ||
e9be9d5e MS |
755 | err = ovl_want_write(dentry); |
756 | if (err) | |
757 | goto out; | |
758 | ||
759 | err = ovl_copy_up(dentry->d_parent); | |
760 | if (err) | |
761 | goto out_drop_write; | |
762 | ||
5f8415d6 AG |
763 | err = ovl_nlink_start(dentry, &locked); |
764 | if (err) | |
765 | goto out_drop_write; | |
e9be9d5e | 766 | |
1175b6b8 | 767 | old_cred = ovl_override_creds(dentry->d_sb); |
2aff4534 | 768 | if (!ovl_lower_positive(dentry)) |
1175b6b8 VG |
769 | err = ovl_remove_upper(dentry, is_dir); |
770 | else | |
a105d685 | 771 | err = ovl_remove_and_whiteout(dentry, is_dir); |
1175b6b8 | 772 | revert_creds(old_cred); |
dbc816d0 MS |
773 | if (!err) { |
774 | if (is_dir) | |
775 | clear_nlink(dentry->d_inode); | |
776 | else | |
777 | drop_nlink(dentry->d_inode); | |
778 | } | |
5f8415d6 | 779 | ovl_nlink_end(dentry, locked); |
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 | ||
0ee931c4 | 821 | buf = ret = kmalloc(buflen, GFP_KERNEL); |
a6c60655 MS |
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; | |
5f8415d6 | 902 | bool locked = false; |
e9be9d5e MS |
903 | struct dentry *old_upperdir; |
904 | struct dentry *new_upperdir; | |
905 | struct dentry *olddentry; | |
906 | struct dentry *newdentry; | |
907 | struct dentry *trap; | |
908 | bool old_opaque; | |
909 | bool new_opaque; | |
e9be9d5e MS |
910 | bool cleanup_whiteout = false; |
911 | bool overwrite = !(flags & RENAME_EXCHANGE); | |
e36cb0b8 | 912 | bool is_dir = d_is_dir(old); |
370e55ac | 913 | bool new_is_dir = d_is_dir(new); |
a6c60655 | 914 | bool samedir = olddir == newdir; |
e9be9d5e MS |
915 | struct dentry *opaquedir = NULL; |
916 | const struct cred *old_cred = NULL; | |
e9be9d5e MS |
917 | |
918 | err = -EINVAL; | |
919 | if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) | |
920 | goto out; | |
921 | ||
922 | flags &= ~RENAME_NOREPLACE; | |
923 | ||
e9be9d5e | 924 | /* Don't copy up directory trees */ |
e9be9d5e | 925 | err = -EXDEV; |
a6c60655 | 926 | if (!ovl_can_move(old)) |
370e55ac | 927 | goto out; |
a6c60655 | 928 | if (!overwrite && !ovl_can_move(new)) |
e9be9d5e | 929 | goto out; |
e9be9d5e MS |
930 | |
931 | err = ovl_want_write(old); | |
932 | if (err) | |
933 | goto out; | |
934 | ||
935 | err = ovl_copy_up(old); | |
936 | if (err) | |
937 | goto out_drop_write; | |
938 | ||
939 | err = ovl_copy_up(new->d_parent); | |
940 | if (err) | |
941 | goto out_drop_write; | |
942 | if (!overwrite) { | |
943 | err = ovl_copy_up(new); | |
944 | if (err) | |
945 | goto out_drop_write; | |
5f8415d6 AG |
946 | } else { |
947 | err = ovl_nlink_start(new, &locked); | |
948 | if (err) | |
949 | goto out_drop_write; | |
e9be9d5e MS |
950 | } |
951 | ||
1175b6b8 | 952 | old_cred = ovl_override_creds(old->d_sb); |
e9be9d5e | 953 | |
07f6fff1 | 954 | if (overwrite && new_is_dir && (ovl_type_merge_or_lower(new) || |
955 | ovl_may_have_whiteouts(new))) { | |
a105d685 | 956 | opaquedir = ovl_check_empty_and_clear(new); |
e9be9d5e MS |
957 | err = PTR_ERR(opaquedir); |
958 | if (IS_ERR(opaquedir)) { | |
959 | opaquedir = NULL; | |
960 | goto out_revert_creds; | |
961 | } | |
962 | } | |
963 | ||
964 | if (overwrite) { | |
2aff4534 | 965 | if (ovl_lower_positive(old)) { |
c412ce49 | 966 | if (!ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
967 | /* Whiteout source */ |
968 | flags |= RENAME_WHITEOUT; | |
969 | } else { | |
970 | /* Switch whiteouts */ | |
971 | flags |= RENAME_EXCHANGE; | |
972 | } | |
c412ce49 | 973 | } else if (is_dir && ovl_dentry_is_whiteout(new)) { |
e9be9d5e MS |
974 | flags |= RENAME_EXCHANGE; |
975 | cleanup_whiteout = true; | |
976 | } | |
977 | } | |
978 | ||
979 | old_upperdir = ovl_dentry_upper(old->d_parent); | |
980 | new_upperdir = ovl_dentry_upper(new->d_parent); | |
981 | ||
ee1d6d37 AG |
982 | if (!samedir) { |
983 | /* | |
984 | * When moving a merge dir or non-dir with copy up origin into | |
f3a15685 AG |
985 | * a new parent, we are marking the new parent dir "impure". |
986 | * When ovl_iterate() iterates an "impure" upper dir, it will | |
987 | * lookup the origin inodes of the entries to fill d_ino. | |
ee1d6d37 | 988 | */ |
f3a15685 | 989 | if (ovl_type_origin(old)) { |
ee1d6d37 AG |
990 | err = ovl_set_impure(new->d_parent, new_upperdir); |
991 | if (err) | |
992 | goto out_revert_creds; | |
993 | } | |
f3a15685 | 994 | if (!overwrite && ovl_type_origin(new)) { |
ee1d6d37 AG |
995 | err = ovl_set_impure(old->d_parent, old_upperdir); |
996 | if (err) | |
997 | goto out_revert_creds; | |
998 | } | |
999 | } | |
1000 | ||
e9be9d5e MS |
1001 | trap = lock_rename(new_upperdir, old_upperdir); |
1002 | ||
11f37104 MS |
1003 | olddentry = lookup_one_len(old->d_name.name, old_upperdir, |
1004 | old->d_name.len); | |
1005 | err = PTR_ERR(olddentry); | |
1006 | if (IS_ERR(olddentry)) | |
1007 | goto out_unlock; | |
1008 | ||
1009 | err = -ESTALE; | |
9020df37 | 1010 | if (!ovl_matches_upper(old, olddentry)) |
11f37104 MS |
1011 | goto out_dput_old; |
1012 | ||
1013 | newdentry = lookup_one_len(new->d_name.name, new_upperdir, | |
1014 | new->d_name.len); | |
1015 | err = PTR_ERR(newdentry); | |
1016 | if (IS_ERR(newdentry)) | |
1017 | goto out_dput_old; | |
1018 | ||
3ee23ff1 MS |
1019 | old_opaque = ovl_dentry_is_opaque(old); |
1020 | new_opaque = ovl_dentry_is_opaque(new); | |
1021 | ||
11f37104 | 1022 | err = -ESTALE; |
09d8b586 | 1023 | if (d_inode(new) && ovl_dentry_upper(new)) { |
e9be9d5e | 1024 | if (opaquedir) { |
11f37104 MS |
1025 | if (newdentry != opaquedir) |
1026 | goto out_dput; | |
e9be9d5e | 1027 | } else { |
9020df37 | 1028 | if (!ovl_matches_upper(new, newdentry)) |
11f37104 | 1029 | goto out_dput; |
e9be9d5e MS |
1030 | } |
1031 | } else { | |
11f37104 MS |
1032 | if (!d_is_negative(newdentry) && |
1033 | (!new_opaque || !ovl_is_whiteout(newdentry))) | |
1034 | goto out_dput; | |
e9be9d5e MS |
1035 | } |
1036 | ||
e9be9d5e MS |
1037 | if (olddentry == trap) |
1038 | goto out_dput; | |
1039 | if (newdentry == trap) | |
1040 | goto out_dput; | |
1041 | ||
804032fa MS |
1042 | if (WARN_ON(olddentry->d_inode == newdentry->d_inode)) |
1043 | goto out_dput; | |
1044 | ||
5cf5b477 | 1045 | err = 0; |
a6c60655 | 1046 | if (is_dir) { |
5cf5b477 | 1047 | if (ovl_type_merge_or_lower(old)) |
a6c60655 | 1048 | err = ovl_set_redirect(old, samedir); |
97c684cc | 1049 | else if (!old_opaque && ovl_type_merge(new->d_parent)) |
21a22878 | 1050 | err = ovl_set_opaque_xerr(old, olddentry, -EXDEV); |
5cf5b477 MS |
1051 | if (err) |
1052 | goto out_dput; | |
e9be9d5e | 1053 | } |
a6c60655 | 1054 | if (!overwrite && new_is_dir) { |
5cf5b477 | 1055 | if (ovl_type_merge_or_lower(new)) |
a6c60655 | 1056 | err = ovl_set_redirect(new, samedir); |
97c684cc | 1057 | else if (!new_opaque && ovl_type_merge(old->d_parent)) |
21a22878 | 1058 | err = ovl_set_opaque_xerr(new, newdentry, -EXDEV); |
5cf5b477 MS |
1059 | if (err) |
1060 | goto out_dput; | |
e9be9d5e MS |
1061 | } |
1062 | ||
3ee23ff1 MS |
1063 | err = ovl_do_rename(old_upperdir->d_inode, olddentry, |
1064 | new_upperdir->d_inode, newdentry, flags); | |
1065 | if (err) | |
e9be9d5e | 1066 | goto out_dput; |
e9be9d5e MS |
1067 | |
1068 | if (cleanup_whiteout) | |
1069 | ovl_cleanup(old_upperdir->d_inode, newdentry); | |
1070 | ||
f681eb1d AG |
1071 | if (overwrite && d_inode(new)) { |
1072 | if (new_is_dir) | |
1073 | clear_nlink(d_inode(new)); | |
1074 | else | |
1075 | drop_nlink(d_inode(new)); | |
1076 | } | |
1077 | ||
f30536f0 AG |
1078 | ovl_dentry_version_inc(old->d_parent, ovl_type_origin(old) || |
1079 | (!overwrite && ovl_type_origin(new))); | |
1080 | ovl_dentry_version_inc(new->d_parent, ovl_type_origin(old) || | |
1081 | (d_inode(new) && ovl_type_origin(new))); | |
e9be9d5e MS |
1082 | |
1083 | out_dput: | |
1084 | dput(newdentry); | |
11f37104 MS |
1085 | out_dput_old: |
1086 | dput(olddentry); | |
e9be9d5e MS |
1087 | out_unlock: |
1088 | unlock_rename(new_upperdir, old_upperdir); | |
1089 | out_revert_creds: | |
1175b6b8 | 1090 | revert_creds(old_cred); |
5f8415d6 | 1091 | ovl_nlink_end(new, locked); |
e9be9d5e MS |
1092 | out_drop_write: |
1093 | ovl_drop_write(old); | |
1094 | out: | |
1095 | dput(opaquedir); | |
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 | }; |