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 | ||
137ec526 | 46 | static 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 | ||
f73cc77c AV |
117 | static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry, |
118 | umode_t mode) | |
119 | { | |
120 | int err; | |
121 | struct dentry *d, *dentry = *newdentry; | |
122 | ||
123 | err = ovl_do_mkdir(dir, dentry, mode); | |
124 | if (err) | |
125 | return err; | |
126 | ||
127 | if (likely(!d_unhashed(dentry))) | |
128 | return 0; | |
129 | ||
130 | /* | |
131 | * vfs_mkdir() may succeed and leave the dentry passed | |
132 | * to it unhashed and negative. If that happens, try to | |
133 | * lookup a new hashed and positive dentry. | |
134 | */ | |
135 | d = lookup_one_len(dentry->d_name.name, dentry->d_parent, | |
136 | dentry->d_name.len); | |
137 | if (IS_ERR(d)) { | |
138 | pr_warn("overlayfs: failed lookup after mkdir (%pd2, err=%i).\n", | |
139 | dentry, err); | |
140 | return PTR_ERR(d); | |
141 | } | |
142 | dput(dentry); | |
143 | *newdentry = d; | |
144 | ||
145 | return 0; | |
146 | } | |
147 | ||
95a1c815 MS |
148 | struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry, |
149 | struct ovl_cattr *attr) | |
e9be9d5e MS |
150 | { |
151 | int err; | |
152 | ||
95a1c815 MS |
153 | if (IS_ERR(newdentry)) |
154 | return newdentry; | |
155 | ||
156 | err = -ESTALE; | |
e9be9d5e | 157 | if (newdentry->d_inode) |
95a1c815 | 158 | goto out; |
e9be9d5e | 159 | |
471ec5dc AG |
160 | if (attr->hardlink) { |
161 | err = ovl_do_link(attr->hardlink, dir, newdentry); | |
e9be9d5e | 162 | } else { |
32a3d848 | 163 | switch (attr->mode & S_IFMT) { |
e9be9d5e | 164 | case S_IFREG: |
6cf00764 | 165 | err = ovl_do_create(dir, newdentry, attr->mode); |
e9be9d5e MS |
166 | break; |
167 | ||
168 | case S_IFDIR: | |
f73cc77c AV |
169 | /* mkdir is special... */ |
170 | err = ovl_mkdir_real(dir, &newdentry, attr->mode); | |
e9be9d5e MS |
171 | break; |
172 | ||
173 | case S_IFCHR: | |
174 | case S_IFBLK: | |
175 | case S_IFIFO: | |
176 | case S_IFSOCK: | |
6cf00764 AG |
177 | err = ovl_do_mknod(dir, newdentry, attr->mode, |
178 | attr->rdev); | |
e9be9d5e MS |
179 | break; |
180 | ||
181 | case S_IFLNK: | |
6cf00764 | 182 | err = ovl_do_symlink(dir, newdentry, attr->link); |
e9be9d5e MS |
183 | break; |
184 | ||
185 | default: | |
186 | err = -EPERM; | |
187 | } | |
188 | } | |
189 | if (!err && WARN_ON(!newdentry->d_inode)) { | |
190 | /* | |
191 | * Not quite sure if non-instantiated dentry is legal or not. | |
192 | * VFS doesn't seem to care so check and warn here. | |
193 | */ | |
dd8ac699 | 194 | err = -EIO; |
e9be9d5e | 195 | } |
95a1c815 MS |
196 | out: |
197 | if (err) { | |
198 | dput(newdentry); | |
199 | return ERR_PTR(err); | |
200 | } | |
201 | return newdentry; | |
e9be9d5e MS |
202 | } |
203 | ||
137ec526 AG |
204 | struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr) |
205 | { | |
206 | return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir), | |
207 | attr); | |
208 | } | |
209 | ||
21a22878 AG |
210 | static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper, |
211 | int xerr) | |
e9be9d5e | 212 | { |
5cf5b477 MS |
213 | int err; |
214 | ||
21a22878 | 215 | err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr); |
5cf5b477 MS |
216 | if (!err) |
217 | ovl_dentry_set_opaque(dentry); | |
218 | ||
219 | return err; | |
e9be9d5e MS |
220 | } |
221 | ||
21a22878 AG |
222 | static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry) |
223 | { | |
224 | /* | |
225 | * Fail with -EIO when trying to create opaque dir and upper doesn't | |
226 | * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to | |
227 | * return a specific error for noxattr case. | |
228 | */ | |
229 | return ovl_set_opaque_xerr(dentry, upperdentry, -EIO); | |
230 | } | |
231 | ||
72e48481 VG |
232 | /* Common operations required to be done after creation of file on upper */ |
233 | static void ovl_instantiate(struct dentry *dentry, struct inode *inode, | |
51f7e52d | 234 | struct dentry *newdentry, bool hardlink) |
72e48481 | 235 | { |
4edb83bb | 236 | ovl_dentry_version_inc(dentry->d_parent, false); |
55acc661 | 237 | ovl_dentry_set_upper_alias(dentry); |
51f7e52d | 238 | if (!hardlink) { |
09d8b586 | 239 | ovl_inode_update(inode, newdentry); |
51f7e52d MS |
240 | ovl_copyattr(newdentry->d_inode, inode); |
241 | } else { | |
09d8b586 MS |
242 | WARN_ON(ovl_inode_real(inode) != d_inode(newdentry)); |
243 | dput(newdentry); | |
51f7e52d MS |
244 | inc_nlink(inode); |
245 | } | |
72e48481 | 246 | d_instantiate(dentry, inode); |
5b6c9053 AG |
247 | /* Force lookup of new upper hardlink to find its lower */ |
248 | if (hardlink) | |
249 | d_drop(dentry); | |
72e48481 VG |
250 | } |
251 | ||
97c684cc AG |
252 | static bool ovl_type_merge(struct dentry *dentry) |
253 | { | |
254 | return OVL_TYPE_MERGE(ovl_path_type(dentry)); | |
255 | } | |
256 | ||
ee1d6d37 AG |
257 | static bool ovl_type_origin(struct dentry *dentry) |
258 | { | |
259 | return OVL_TYPE_ORIGIN(ovl_path_type(dentry)); | |
260 | } | |
261 | ||
e9be9d5e | 262 | static int ovl_create_upper(struct dentry *dentry, struct inode *inode, |
471ec5dc | 263 | struct ovl_cattr *attr) |
e9be9d5e MS |
264 | { |
265 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
266 | struct inode *udir = upperdir->d_inode; | |
267 | struct dentry *newdentry; | |
268 | int err; | |
269 | ||
471ec5dc | 270 | if (!attr->hardlink && !IS_POSIXACL(udir)) |
32a3d848 | 271 | attr->mode &= ~current_umask(); |
38b25697 | 272 | |
5955102c | 273 | inode_lock_nested(udir, I_MUTEX_PARENT); |
95a1c815 MS |
274 | newdentry = ovl_create_real(udir, |
275 | lookup_one_len(dentry->d_name.name, | |
276 | upperdir, | |
277 | dentry->d_name.len), | |
278 | attr); | |
e9be9d5e MS |
279 | err = PTR_ERR(newdentry); |
280 | if (IS_ERR(newdentry)) | |
281 | goto out_unlock; | |
e9be9d5e | 282 | |
4a99f3c8 | 283 | if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) { |
97c684cc AG |
284 | /* Setting opaque here is just an optimization, allow to fail */ |
285 | ovl_set_opaque(dentry, newdentry); | |
286 | } | |
287 | ||
471ec5dc | 288 | ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink); |
95a1c815 | 289 | err = 0; |
e9be9d5e | 290 | out_unlock: |
5955102c | 291 | inode_unlock(udir); |
e9be9d5e MS |
292 | return err; |
293 | } | |
294 | ||
e9be9d5e MS |
295 | static struct dentry *ovl_clear_empty(struct dentry *dentry, |
296 | struct list_head *list) | |
297 | { | |
298 | struct dentry *workdir = ovl_workdir(dentry); | |
299 | struct inode *wdir = workdir->d_inode; | |
300 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
301 | struct inode *udir = upperdir->d_inode; | |
302 | struct path upperpath; | |
303 | struct dentry *upper; | |
304 | struct dentry *opaquedir; | |
305 | struct kstat stat; | |
306 | int err; | |
307 | ||
cc6f67bc MS |
308 | if (WARN_ON(!workdir)) |
309 | return ERR_PTR(-EROFS); | |
310 | ||
e9be9d5e MS |
311 | err = ovl_lock_rename_workdir(workdir, upperdir); |
312 | if (err) | |
313 | goto out; | |
314 | ||
315 | ovl_path_upper(dentry, &upperpath); | |
a528d35e DH |
316 | err = vfs_getattr(&upperpath, &stat, |
317 | STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT); | |
e9be9d5e MS |
318 | if (err) |
319 | goto out_unlock; | |
320 | ||
321 | err = -ESTALE; | |
322 | if (!S_ISDIR(stat.mode)) | |
323 | goto out_unlock; | |
324 | upper = upperpath.dentry; | |
325 | if (upper->d_parent->d_inode != udir) | |
326 | goto out_unlock; | |
327 | ||
137ec526 | 328 | opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode)); |
e9be9d5e MS |
329 | err = PTR_ERR(opaquedir); |
330 | if (IS_ERR(opaquedir)) | |
331 | goto out_unlock; | |
332 | ||
e9be9d5e MS |
333 | err = ovl_copy_xattr(upper, opaquedir); |
334 | if (err) | |
335 | goto out_cleanup; | |
336 | ||
5cf5b477 | 337 | err = ovl_set_opaque(dentry, opaquedir); |
e9be9d5e MS |
338 | if (err) |
339 | goto out_cleanup; | |
340 | ||
5955102c | 341 | inode_lock(opaquedir->d_inode); |
e9be9d5e | 342 | err = ovl_set_attr(opaquedir, &stat); |
5955102c | 343 | inode_unlock(opaquedir->d_inode); |
e9be9d5e MS |
344 | if (err) |
345 | goto out_cleanup; | |
346 | ||
347 | err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE); | |
348 | if (err) | |
349 | goto out_cleanup; | |
350 | ||
351 | ovl_cleanup_whiteouts(upper, list); | |
352 | ovl_cleanup(wdir, upper); | |
353 | unlock_rename(workdir, upperdir); | |
354 | ||
355 | /* dentry's upper doesn't match now, get rid of it */ | |
356 | d_drop(dentry); | |
357 | ||
358 | return opaquedir; | |
359 | ||
360 | out_cleanup: | |
361 | ovl_cleanup(wdir, opaquedir); | |
e9be9d5e MS |
362 | dput(opaquedir); |
363 | out_unlock: | |
364 | unlock_rename(workdir, upperdir); | |
365 | out: | |
366 | return ERR_PTR(err); | |
367 | } | |
368 | ||
38b25697 MS |
369 | static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name, |
370 | const struct posix_acl *acl) | |
371 | { | |
372 | void *buffer; | |
373 | size_t size; | |
374 | int err; | |
375 | ||
376 | if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl) | |
377 | return 0; | |
378 | ||
379 | size = posix_acl_to_xattr(NULL, acl, NULL, 0); | |
380 | buffer = kmalloc(size, GFP_KERNEL); | |
381 | if (!buffer) | |
382 | return -ENOMEM; | |
383 | ||
384 | size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size); | |
385 | err = size; | |
386 | if (err < 0) | |
387 | goto out_free; | |
388 | ||
389 | err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE); | |
390 | out_free: | |
391 | kfree(buffer); | |
392 | return err; | |
393 | } | |
394 | ||
e9be9d5e | 395 | static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode, |
471ec5dc | 396 | struct ovl_cattr *cattr) |
e9be9d5e MS |
397 | { |
398 | struct dentry *workdir = ovl_workdir(dentry); | |
399 | struct inode *wdir = workdir->d_inode; | |
400 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
401 | struct inode *udir = upperdir->d_inode; | |
402 | struct dentry *upper; | |
403 | struct dentry *newdentry; | |
404 | int err; | |
38b25697 | 405 | struct posix_acl *acl, *default_acl; |
471ec5dc | 406 | bool hardlink = !!cattr->hardlink; |
e9be9d5e | 407 | |
cc6f67bc MS |
408 | if (WARN_ON(!workdir)) |
409 | return -EROFS; | |
410 | ||
38b25697 MS |
411 | if (!hardlink) { |
412 | err = posix_acl_create(dentry->d_parent->d_inode, | |
32a3d848 | 413 | &cattr->mode, &default_acl, &acl); |
38b25697 MS |
414 | if (err) |
415 | return err; | |
416 | } | |
417 | ||
e9be9d5e MS |
418 | err = ovl_lock_rename_workdir(workdir, upperdir); |
419 | if (err) | |
420 | goto out; | |
421 | ||
e9be9d5e MS |
422 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
423 | dentry->d_name.len); | |
424 | err = PTR_ERR(upper); | |
425 | if (IS_ERR(upper)) | |
95a1c815 | 426 | goto out_unlock; |
e9be9d5e | 427 | |
137ec526 | 428 | newdentry = ovl_create_temp(workdir, cattr); |
95a1c815 MS |
429 | err = PTR_ERR(newdentry); |
430 | if (IS_ERR(newdentry)) | |
431 | goto out_dput; | |
e9be9d5e | 432 | |
bb0d2b8a MS |
433 | /* |
434 | * mode could have been mutilated due to umask (e.g. sgid directory) | |
435 | */ | |
51f7e52d | 436 | if (!hardlink && |
32a3d848 AV |
437 | !S_ISLNK(cattr->mode) && |
438 | newdentry->d_inode->i_mode != cattr->mode) { | |
bb0d2b8a MS |
439 | struct iattr attr = { |
440 | .ia_valid = ATTR_MODE, | |
32a3d848 | 441 | .ia_mode = cattr->mode, |
bb0d2b8a MS |
442 | }; |
443 | inode_lock(newdentry->d_inode); | |
444 | err = notify_change(newdentry, &attr, NULL); | |
445 | inode_unlock(newdentry->d_inode); | |
446 | if (err) | |
447 | goto out_cleanup; | |
448 | } | |
38b25697 MS |
449 | if (!hardlink) { |
450 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS, | |
451 | acl); | |
452 | if (err) | |
453 | goto out_cleanup; | |
454 | ||
455 | err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT, | |
456 | default_acl); | |
457 | if (err) | |
458 | goto out_cleanup; | |
459 | } | |
bb0d2b8a | 460 | |
32a3d848 | 461 | if (!hardlink && S_ISDIR(cattr->mode)) { |
5cf5b477 | 462 | err = ovl_set_opaque(dentry, newdentry); |
e9be9d5e MS |
463 | if (err) |
464 | goto out_cleanup; | |
465 | ||
466 | err = ovl_do_rename(wdir, newdentry, udir, upper, | |
467 | RENAME_EXCHANGE); | |
468 | if (err) | |
469 | goto out_cleanup; | |
470 | ||
471 | ovl_cleanup(wdir, upper); | |
472 | } else { | |
473 | err = ovl_do_rename(wdir, newdentry, udir, upper, 0); | |
474 | if (err) | |
475 | goto out_cleanup; | |
476 | } | |
471ec5dc | 477 | ovl_instantiate(dentry, inode, newdentry, hardlink); |
95a1c815 | 478 | err = 0; |
e9be9d5e | 479 | out_dput: |
95a1c815 | 480 | dput(upper); |
e9be9d5e MS |
481 | out_unlock: |
482 | unlock_rename(workdir, upperdir); | |
483 | out: | |
38b25697 MS |
484 | if (!hardlink) { |
485 | posix_acl_release(acl); | |
486 | posix_acl_release(default_acl); | |
487 | } | |
e9be9d5e MS |
488 | return err; |
489 | ||
490 | out_cleanup: | |
491 | ovl_cleanup(wdir, newdentry); | |
95a1c815 MS |
492 | dput(newdentry); |
493 | goto out_dput; | |
e9be9d5e MS |
494 | } |
495 | ||
51f7e52d | 496 | static int ovl_create_or_link(struct dentry *dentry, struct inode *inode, |
471ec5dc | 497 | struct ovl_cattr *attr, bool origin) |
e9be9d5e MS |
498 | { |
499 | int err; | |
1175b6b8 VG |
500 | const struct cred *old_cred; |
501 | struct cred *override_cred; | |
ea3dad18 | 502 | struct dentry *parent = dentry->d_parent; |
e9be9d5e | 503 | |
ea3dad18 | 504 | err = ovl_copy_up(parent); |
e9be9d5e | 505 | if (err) |
51f7e52d | 506 | return err; |
bb0d2b8a | 507 | |
1175b6b8 | 508 | old_cred = ovl_override_creds(dentry->d_sb); |
ea3dad18 AG |
509 | |
510 | /* | |
511 | * When linking a file with copy up origin into a new parent, mark the | |
512 | * new parent dir "impure". | |
513 | */ | |
514 | if (origin) { | |
515 | err = ovl_set_impure(parent, ovl_dentry_upper(parent)); | |
516 | if (err) | |
517 | goto out_revert_creds; | |
518 | } | |
519 | ||
1175b6b8 VG |
520 | err = -ENOMEM; |
521 | override_cred = prepare_creds(); | |
522 | if (override_cred) { | |
bb0d2b8a MS |
523 | override_cred->fsuid = inode->i_uid; |
524 | override_cred->fsgid = inode->i_gid; | |
471ec5dc | 525 | if (!attr->hardlink) { |
2602625b | 526 | err = security_dentry_create_files_as(dentry, |
32a3d848 | 527 | attr->mode, &dentry->d_name, old_cred, |
2602625b VG |
528 | override_cred); |
529 | if (err) { | |
530 | put_cred(override_cred); | |
531 | goto out_revert_creds; | |
532 | } | |
533 | } | |
1175b6b8 VG |
534 | put_cred(override_creds(override_cred)); |
535 | put_cred(override_cred); | |
536 | ||
c412ce49 | 537 | if (!ovl_dentry_is_whiteout(dentry)) |
471ec5dc | 538 | err = ovl_create_upper(dentry, inode, attr); |
1175b6b8 | 539 | else |
471ec5dc | 540 | err = ovl_create_over_whiteout(dentry, inode, attr); |
e9be9d5e | 541 | } |
2602625b | 542 | out_revert_creds: |
1175b6b8 | 543 | revert_creds(old_cred); |
e9be9d5e MS |
544 | return err; |
545 | } | |
546 | ||
547 | static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev, | |
548 | const char *link) | |
549 | { | |
550 | int err; | |
51f7e52d | 551 | struct inode *inode; |
471ec5dc | 552 | struct ovl_cattr attr = { |
51f7e52d | 553 | .rdev = rdev, |
32a3d848 | 554 | .link = link, |
51f7e52d | 555 | }; |
e9be9d5e MS |
556 | |
557 | err = ovl_want_write(dentry); | |
51f7e52d MS |
558 | if (err) |
559 | goto out; | |
560 | ||
561 | err = -ENOMEM; | |
ca4c8a3a | 562 | inode = ovl_new_inode(dentry->d_sb, mode, rdev); |
51f7e52d MS |
563 | if (!inode) |
564 | goto out_drop_write; | |
565 | ||
566 | inode_init_owner(inode, dentry->d_parent->d_inode, mode); | |
32a3d848 | 567 | attr.mode = inode->i_mode; |
51f7e52d | 568 | |
471ec5dc | 569 | err = ovl_create_or_link(dentry, inode, &attr, false); |
51f7e52d MS |
570 | if (err) |
571 | iput(inode); | |
e9be9d5e | 572 | |
51f7e52d MS |
573 | out_drop_write: |
574 | ovl_drop_write(dentry); | |
575 | out: | |
e9be9d5e MS |
576 | return err; |
577 | } | |
578 | ||
579 | static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode, | |
580 | bool excl) | |
581 | { | |
582 | return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL); | |
583 | } | |
584 | ||
585 | static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) | |
586 | { | |
587 | return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL); | |
588 | } | |
589 | ||
590 | static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, | |
591 | dev_t rdev) | |
592 | { | |
593 | /* Don't allow creation of "whiteout" on overlay */ | |
594 | if (S_ISCHR(mode) && rdev == WHITEOUT_DEV) | |
595 | return -EPERM; | |
596 | ||
597 | return ovl_create_object(dentry, mode, rdev, NULL); | |
598 | } | |
599 | ||
600 | static int ovl_symlink(struct inode *dir, struct dentry *dentry, | |
601 | const char *link) | |
602 | { | |
603 | return ovl_create_object(dentry, S_IFLNK, 0, link); | |
604 | } | |
605 | ||
606 | static int ovl_link(struct dentry *old, struct inode *newdir, | |
607 | struct dentry *new) | |
608 | { | |
609 | int err; | |
5f8415d6 | 610 | bool locked = false; |
51f7e52d | 611 | struct inode *inode; |
e9be9d5e MS |
612 | |
613 | err = ovl_want_write(old); | |
614 | if (err) | |
615 | goto out; | |
616 | ||
617 | err = ovl_copy_up(old); | |
618 | if (err) | |
619 | goto out_drop_write; | |
620 | ||
5f8415d6 AG |
621 | err = ovl_nlink_start(old, &locked); |
622 | if (err) | |
623 | goto out_drop_write; | |
624 | ||
51f7e52d MS |
625 | inode = d_inode(old); |
626 | ihold(inode); | |
627 | ||
471ec5dc AG |
628 | err = ovl_create_or_link(new, inode, |
629 | &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)}, | |
630 | ovl_type_origin(old)); | |
51f7e52d MS |
631 | if (err) |
632 | iput(inode); | |
e9be9d5e | 633 | |
5f8415d6 | 634 | ovl_nlink_end(old, locked); |
e9be9d5e MS |
635 | out_drop_write: |
636 | ovl_drop_write(old); | |
637 | out: | |
638 | return err; | |
639 | } | |
640 | ||
9020df37 MS |
641 | static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper) |
642 | { | |
643 | return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper); | |
644 | } | |
645 | ||
6d0a8a90 AG |
646 | static int ovl_remove_and_whiteout(struct dentry *dentry, |
647 | struct list_head *list) | |
e9be9d5e MS |
648 | { |
649 | struct dentry *workdir = ovl_workdir(dentry); | |
e9be9d5e | 650 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); |
e9be9d5e MS |
651 | struct dentry *upper; |
652 | struct dentry *opaquedir = NULL; | |
653 | int err; | |
654 | ||
cc6f67bc MS |
655 | if (WARN_ON(!workdir)) |
656 | return -EROFS; | |
657 | ||
6d0a8a90 AG |
658 | if (!list_empty(list)) { |
659 | opaquedir = ovl_clear_empty(dentry, list); | |
30c17ebf MS |
660 | err = PTR_ERR(opaquedir); |
661 | if (IS_ERR(opaquedir)) | |
662 | goto out; | |
e9be9d5e MS |
663 | } |
664 | ||
665 | err = ovl_lock_rename_workdir(workdir, upperdir); | |
666 | if (err) | |
667 | goto out_dput; | |
668 | ||
cfc9fde0 MP |
669 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
670 | dentry->d_name.len); | |
671 | err = PTR_ERR(upper); | |
672 | if (IS_ERR(upper)) | |
e9be9d5e MS |
673 | goto out_unlock; |
674 | ||
cfc9fde0 MP |
675 | err = -ESTALE; |
676 | if ((opaquedir && upper != opaquedir) || | |
677 | (!opaquedir && ovl_dentry_upper(dentry) && | |
9020df37 | 678 | !ovl_matches_upper(dentry, upper))) { |
cfc9fde0 MP |
679 | goto out_dput_upper; |
680 | } | |
e9be9d5e | 681 | |
e7dd0e71 | 682 | err = ovl_cleanup_and_whiteout(workdir, d_inode(upperdir), upper); |
cfc9fde0 | 683 | if (err) |
e7dd0e71 | 684 | goto out_d_drop; |
e9be9d5e | 685 | |
4edb83bb | 686 | ovl_dentry_version_inc(dentry->d_parent, true); |
e9be9d5e MS |
687 | out_d_drop: |
688 | d_drop(dentry); | |
cfc9fde0 MP |
689 | out_dput_upper: |
690 | dput(upper); | |
e9be9d5e MS |
691 | out_unlock: |
692 | unlock_rename(workdir, upperdir); | |
693 | out_dput: | |
694 | dput(opaquedir); | |
695 | out: | |
696 | return err; | |
e9be9d5e MS |
697 | } |
698 | ||
6d0a8a90 AG |
699 | static int ovl_remove_upper(struct dentry *dentry, bool is_dir, |
700 | struct list_head *list) | |
e9be9d5e MS |
701 | { |
702 | struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent); | |
703 | struct inode *dir = upperdir->d_inode; | |
11f37104 | 704 | struct dentry *upper; |
d1595119 | 705 | struct dentry *opaquedir = NULL; |
e9be9d5e MS |
706 | int err; |
707 | ||
6d0a8a90 AG |
708 | if (!list_empty(list)) { |
709 | opaquedir = ovl_clear_empty(dentry, list); | |
d1595119 AG |
710 | err = PTR_ERR(opaquedir); |
711 | if (IS_ERR(opaquedir)) | |
712 | goto out; | |
713 | } | |
714 | ||
5955102c | 715 | inode_lock_nested(dir, I_MUTEX_PARENT); |
11f37104 MS |
716 | upper = lookup_one_len(dentry->d_name.name, upperdir, |
717 | dentry->d_name.len); | |
718 | err = PTR_ERR(upper); | |
719 | if (IS_ERR(upper)) | |
720 | goto out_unlock; | |
721 | ||
e9be9d5e | 722 | err = -ESTALE; |
d1595119 | 723 | if ((opaquedir && upper != opaquedir) || |
9020df37 | 724 | (!opaquedir && !ovl_matches_upper(dentry, upper))) |
d1595119 AG |
725 | goto out_dput_upper; |
726 | ||
727 | if (is_dir) | |
728 | err = vfs_rmdir(dir, upper); | |
729 | else | |
730 | err = vfs_unlink(dir, upper, NULL); | |
4edb83bb | 731 | ovl_dentry_version_inc(dentry->d_parent, ovl_type_origin(dentry)); |
e9be9d5e MS |
732 | |
733 | /* | |
734 | * Keeping this dentry hashed would mean having to release | |
735 | * upperpath/lowerpath, which could only be done if we are the | |
736 | * sole user of this dentry. Too tricky... Just unhash for | |
737 | * now. | |
738 | */ | |
ce9113bb RW |
739 | if (!err) |
740 | d_drop(dentry); | |
d1595119 AG |
741 | out_dput_upper: |
742 | dput(upper); | |
11f37104 | 743 | out_unlock: |
5955102c | 744 | inode_unlock(dir); |
d1595119 AG |
745 | dput(opaquedir); |
746 | out: | |
e9be9d5e MS |
747 | return err; |
748 | } | |
749 | ||
6d0a8a90 AG |
750 | static bool ovl_pure_upper(struct dentry *dentry) |
751 | { | |
752 | return !ovl_dentry_lower(dentry) && | |
753 | !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry)); | |
754 | } | |
755 | ||
e9be9d5e MS |
756 | static int ovl_do_remove(struct dentry *dentry, bool is_dir) |
757 | { | |
e9be9d5e | 758 | int err; |
5f8415d6 | 759 | bool locked = false; |
1175b6b8 | 760 | const struct cred *old_cred; |
6d0a8a90 AG |
761 | bool lower_positive = ovl_lower_positive(dentry); |
762 | LIST_HEAD(list); | |
763 | ||
764 | /* No need to clean pure upper removed by vfs_rmdir() */ | |
765 | if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) { | |
766 | err = ovl_check_empty_dir(dentry, &list); | |
767 | if (err) | |
768 | goto out; | |
769 | } | |
1175b6b8 | 770 | |
e9be9d5e MS |
771 | err = ovl_want_write(dentry); |
772 | if (err) | |
773 | goto out; | |
774 | ||
775 | err = ovl_copy_up(dentry->d_parent); | |
776 | if (err) | |
777 | goto out_drop_write; | |
778 | ||
5f8415d6 AG |
779 | err = ovl_nlink_start(dentry, &locked); |
780 | if (err) | |
781 | goto out_drop_write; | |
e9be9d5e | 782 | |
1175b6b8 | 783 | old_cred = ovl_override_creds(dentry->d_sb); |
6d0a8a90 AG |
784 | if (!lower_positive) |
785 | err = ovl_remove_upper(dentry, is_dir, &list); | |
1175b6b8 | 786 | else |
6d0a8a90 | 787 | err = ovl_remove_and_whiteout(dentry, &list); |
1175b6b8 | 788 | revert_creds(old_cred); |
dbc816d0 MS |
789 | if (!err) { |
790 | if (is_dir) | |
791 | clear_nlink(dentry->d_inode); | |
792 | else | |
793 | drop_nlink(dentry->d_inode); | |
794 | } | |
5f8415d6 | 795 | ovl_nlink_end(dentry, locked); |
e9be9d5e MS |
796 | out_drop_write: |
797 | ovl_drop_write(dentry); | |
798 | out: | |
6d0a8a90 | 799 | ovl_cache_free(&list); |
e9be9d5e MS |
800 | return err; |
801 | } | |
802 | ||
803 | static int ovl_unlink(struct inode *dir, struct dentry *dentry) | |
804 | { | |
805 | return ovl_do_remove(dentry, false); | |
806 | } | |
807 | ||
808 | static int ovl_rmdir(struct inode *dir, struct dentry *dentry) | |
809 | { | |
810 | return ovl_do_remove(dentry, true); | |
811 | } | |
812 | ||
370e55ac MS |
813 | static bool ovl_type_merge_or_lower(struct dentry *dentry) |
814 | { | |
815 | enum ovl_path_type type = ovl_path_type(dentry); | |
816 | ||
817 | return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type); | |
818 | } | |
819 | ||
a6c60655 MS |
820 | static bool ovl_can_move(struct dentry *dentry) |
821 | { | |
822 | return ovl_redirect_dir(dentry->d_sb) || | |
823 | !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry); | |
824 | } | |
825 | ||
a6c60655 MS |
826 | static char *ovl_get_redirect(struct dentry *dentry, bool samedir) |
827 | { | |
828 | char *buf, *ret; | |
829 | struct dentry *d, *tmp; | |
3ea22a71 | 830 | int buflen = ovl_redirect_max + 1; |
a6c60655 MS |
831 | |
832 | if (samedir) { | |
833 | ret = kstrndup(dentry->d_name.name, dentry->d_name.len, | |
834 | GFP_KERNEL); | |
835 | goto out; | |
836 | } | |
837 | ||
0ee931c4 | 838 | buf = ret = kmalloc(buflen, GFP_KERNEL); |
a6c60655 MS |
839 | if (!buf) |
840 | goto out; | |
841 | ||
842 | buflen--; | |
843 | buf[buflen] = '\0'; | |
844 | for (d = dget(dentry); !IS_ROOT(d);) { | |
845 | const char *name; | |
846 | int thislen; | |
847 | ||
848 | spin_lock(&d->d_lock); | |
849 | name = ovl_dentry_get_redirect(d); | |
850 | if (name) { | |
851 | thislen = strlen(name); | |
852 | } else { | |
853 | name = d->d_name.name; | |
854 | thislen = d->d_name.len; | |
855 | } | |
856 | ||
857 | /* If path is too long, fall back to userspace move */ | |
858 | if (thislen + (name[0] != '/') > buflen) { | |
859 | ret = ERR_PTR(-EXDEV); | |
860 | spin_unlock(&d->d_lock); | |
861 | goto out_put; | |
862 | } | |
863 | ||
864 | buflen -= thislen; | |
865 | memcpy(&buf[buflen], name, thislen); | |
866 | tmp = dget_dlock(d->d_parent); | |
867 | spin_unlock(&d->d_lock); | |
868 | ||
869 | dput(d); | |
870 | d = tmp; | |
871 | ||
872 | /* Absolute redirect: finished */ | |
873 | if (buf[buflen] == '/') | |
874 | break; | |
875 | buflen--; | |
876 | buf[buflen] = '/'; | |
877 | } | |
878 | ret = kstrdup(&buf[buflen], GFP_KERNEL); | |
879 | out_put: | |
880 | dput(d); | |
881 | kfree(buf); | |
882 | out: | |
883 | return ret ? ret : ERR_PTR(-ENOMEM); | |
884 | } | |
885 | ||
886 | static int ovl_set_redirect(struct dentry *dentry, bool samedir) | |
887 | { | |
888 | int err; | |
889 | const char *redirect = ovl_dentry_get_redirect(dentry); | |
890 | ||
891 | if (redirect && (samedir || redirect[0] == '/')) | |
892 | return 0; | |
893 | ||
894 | redirect = ovl_get_redirect(dentry, samedir); | |
895 | if (IS_ERR(redirect)) | |
896 | return PTR_ERR(redirect); | |
897 | ||
21a22878 AG |
898 | err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry), |
899 | OVL_XATTR_REDIRECT, | |
900 | redirect, strlen(redirect), -EXDEV); | |
a6c60655 MS |
901 | if (!err) { |
902 | spin_lock(&dentry->d_lock); | |
903 | ovl_dentry_set_redirect(dentry, redirect); | |
904 | spin_unlock(&dentry->d_lock); | |
905 | } else { | |
906 | kfree(redirect); | |
da2e6b7e AG |
907 | pr_warn_ratelimited("overlayfs: failed to set redirect (%i)\n", |
908 | err); | |
a6c60655 MS |
909 | /* Fall back to userspace copy-up */ |
910 | err = -EXDEV; | |
911 | } | |
912 | return err; | |
913 | } | |
914 | ||
6c02cb59 MS |
915 | static int ovl_rename(struct inode *olddir, struct dentry *old, |
916 | struct inode *newdir, struct dentry *new, | |
917 | unsigned int flags) | |
e9be9d5e MS |
918 | { |
919 | int err; | |
5f8415d6 | 920 | bool locked = false; |
e9be9d5e MS |
921 | struct dentry *old_upperdir; |
922 | struct dentry *new_upperdir; | |
923 | struct dentry *olddentry; | |
924 | struct dentry *newdentry; | |
925 | struct dentry *trap; | |
926 | bool old_opaque; | |
927 | bool new_opaque; | |
e9be9d5e MS |
928 | bool cleanup_whiteout = false; |
929 | bool overwrite = !(flags & RENAME_EXCHANGE); | |
e36cb0b8 | 930 | bool is_dir = d_is_dir(old); |
370e55ac | 931 | bool new_is_dir = d_is_dir(new); |
a6c60655 | 932 | bool samedir = olddir == newdir; |
e9be9d5e MS |
933 | struct dentry *opaquedir = NULL; |
934 | const struct cred *old_cred = NULL; | |
6d0a8a90 | 935 | LIST_HEAD(list); |
e9be9d5e MS |
936 | |
937 | err = -EINVAL; | |
938 | if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE)) | |
939 | goto out; | |
940 | ||
941 | flags &= ~RENAME_NOREPLACE; | |
942 | ||
e9be9d5e | 943 | /* Don't copy up directory trees */ |
e9be9d5e | 944 | err = -EXDEV; |
a6c60655 | 945 | if (!ovl_can_move(old)) |
370e55ac | 946 | goto out; |
a6c60655 | 947 | if (!overwrite && !ovl_can_move(new)) |
e9be9d5e | 948 | goto out; |
e9be9d5e | 949 | |
6d0a8a90 AG |
950 | if (overwrite && new_is_dir && !ovl_pure_upper(new)) { |
951 | err = ovl_check_empty_dir(new, &list); | |
952 | if (err) | |
953 | goto out; | |
954 | } | |
955 | ||
956 | if (overwrite) { | |
957 | if (ovl_lower_positive(old)) { | |
958 | if (!ovl_dentry_is_whiteout(new)) { | |
959 | /* Whiteout source */ | |
960 | flags |= RENAME_WHITEOUT; | |
961 | } else { | |
962 | /* Switch whiteouts */ | |
963 | flags |= RENAME_EXCHANGE; | |
964 | } | |
965 | } else if (is_dir && ovl_dentry_is_whiteout(new)) { | |
966 | flags |= RENAME_EXCHANGE; | |
967 | cleanup_whiteout = true; | |
968 | } | |
969 | } | |
970 | ||
e9be9d5e MS |
971 | err = ovl_want_write(old); |
972 | if (err) | |
973 | goto out; | |
974 | ||
975 | err = ovl_copy_up(old); | |
976 | if (err) | |
977 | goto out_drop_write; | |
978 | ||
979 | err = ovl_copy_up(new->d_parent); | |
980 | if (err) | |
981 | goto out_drop_write; | |
982 | if (!overwrite) { | |
983 | err = ovl_copy_up(new); | |
984 | if (err) | |
985 | goto out_drop_write; | |
5f8415d6 AG |
986 | } else { |
987 | err = ovl_nlink_start(new, &locked); | |
988 | if (err) | |
989 | goto out_drop_write; | |
e9be9d5e MS |
990 | } |
991 | ||
1175b6b8 | 992 | old_cred = ovl_override_creds(old->d_sb); |
e9be9d5e | 993 | |
6d0a8a90 AG |
994 | if (!list_empty(&list)) { |
995 | opaquedir = ovl_clear_empty(new, &list); | |
e9be9d5e MS |
996 | err = PTR_ERR(opaquedir); |
997 | if (IS_ERR(opaquedir)) { | |
998 | opaquedir = NULL; | |
999 | goto out_revert_creds; | |
1000 | } | |
1001 | } | |
1002 | ||
e9be9d5e MS |
1003 | old_upperdir = ovl_dentry_upper(old->d_parent); |
1004 | new_upperdir = ovl_dentry_upper(new->d_parent); | |
1005 | ||
ee1d6d37 AG |
1006 | if (!samedir) { |
1007 | /* | |
1008 | * When moving a merge dir or non-dir with copy up origin into | |
f3a15685 AG |
1009 | * a new parent, we are marking the new parent dir "impure". |
1010 | * When ovl_iterate() iterates an "impure" upper dir, it will | |
1011 | * lookup the origin inodes of the entries to fill d_ino. | |
ee1d6d37 | 1012 | */ |
f3a15685 | 1013 | if (ovl_type_origin(old)) { |
ee1d6d37 AG |
1014 | err = ovl_set_impure(new->d_parent, new_upperdir); |
1015 | if (err) | |
1016 | goto out_revert_creds; | |
1017 | } | |
f3a15685 | 1018 | if (!overwrite && ovl_type_origin(new)) { |
ee1d6d37 AG |
1019 | err = ovl_set_impure(old->d_parent, old_upperdir); |
1020 | if (err) | |
1021 | goto out_revert_creds; | |
1022 | } | |
1023 | } | |
1024 | ||
e9be9d5e MS |
1025 | trap = lock_rename(new_upperdir, old_upperdir); |
1026 | ||
11f37104 MS |
1027 | olddentry = lookup_one_len(old->d_name.name, old_upperdir, |
1028 | old->d_name.len); | |
1029 | err = PTR_ERR(olddentry); | |
1030 | if (IS_ERR(olddentry)) | |
1031 | goto out_unlock; | |
1032 | ||
1033 | err = -ESTALE; | |
9020df37 | 1034 | if (!ovl_matches_upper(old, olddentry)) |
11f37104 MS |
1035 | goto out_dput_old; |
1036 | ||
1037 | newdentry = lookup_one_len(new->d_name.name, new_upperdir, | |
1038 | new->d_name.len); | |
1039 | err = PTR_ERR(newdentry); | |
1040 | if (IS_ERR(newdentry)) | |
1041 | goto out_dput_old; | |
1042 | ||
3ee23ff1 MS |
1043 | old_opaque = ovl_dentry_is_opaque(old); |
1044 | new_opaque = ovl_dentry_is_opaque(new); | |
1045 | ||
11f37104 | 1046 | err = -ESTALE; |
09d8b586 | 1047 | if (d_inode(new) && ovl_dentry_upper(new)) { |
e9be9d5e | 1048 | if (opaquedir) { |
11f37104 MS |
1049 | if (newdentry != opaquedir) |
1050 | goto out_dput; | |
e9be9d5e | 1051 | } else { |
9020df37 | 1052 | if (!ovl_matches_upper(new, newdentry)) |
11f37104 | 1053 | goto out_dput; |
e9be9d5e MS |
1054 | } |
1055 | } else { | |
11f37104 MS |
1056 | if (!d_is_negative(newdentry) && |
1057 | (!new_opaque || !ovl_is_whiteout(newdentry))) | |
1058 | goto out_dput; | |
e9be9d5e MS |
1059 | } |
1060 | ||
e9be9d5e MS |
1061 | if (olddentry == trap) |
1062 | goto out_dput; | |
1063 | if (newdentry == trap) | |
1064 | goto out_dput; | |
1065 | ||
804032fa MS |
1066 | if (WARN_ON(olddentry->d_inode == newdentry->d_inode)) |
1067 | goto out_dput; | |
1068 | ||
5cf5b477 | 1069 | err = 0; |
a6c60655 | 1070 | if (is_dir) { |
5cf5b477 | 1071 | if (ovl_type_merge_or_lower(old)) |
a6c60655 | 1072 | err = ovl_set_redirect(old, samedir); |
97c684cc | 1073 | else if (!old_opaque && ovl_type_merge(new->d_parent)) |
21a22878 | 1074 | err = ovl_set_opaque_xerr(old, olddentry, -EXDEV); |
5cf5b477 MS |
1075 | if (err) |
1076 | goto out_dput; | |
e9be9d5e | 1077 | } |
a6c60655 | 1078 | if (!overwrite && new_is_dir) { |
5cf5b477 | 1079 | if (ovl_type_merge_or_lower(new)) |
a6c60655 | 1080 | err = ovl_set_redirect(new, samedir); |
97c684cc | 1081 | else if (!new_opaque && ovl_type_merge(old->d_parent)) |
21a22878 | 1082 | err = ovl_set_opaque_xerr(new, newdentry, -EXDEV); |
5cf5b477 MS |
1083 | if (err) |
1084 | goto out_dput; | |
e9be9d5e MS |
1085 | } |
1086 | ||
3ee23ff1 MS |
1087 | err = ovl_do_rename(old_upperdir->d_inode, olddentry, |
1088 | new_upperdir->d_inode, newdentry, flags); | |
1089 | if (err) | |
e9be9d5e | 1090 | goto out_dput; |
e9be9d5e MS |
1091 | |
1092 | if (cleanup_whiteout) | |
1093 | ovl_cleanup(old_upperdir->d_inode, newdentry); | |
1094 | ||
f681eb1d AG |
1095 | if (overwrite && d_inode(new)) { |
1096 | if (new_is_dir) | |
1097 | clear_nlink(d_inode(new)); | |
1098 | else | |
1099 | drop_nlink(d_inode(new)); | |
1100 | } | |
1101 | ||
f30536f0 AG |
1102 | ovl_dentry_version_inc(old->d_parent, ovl_type_origin(old) || |
1103 | (!overwrite && ovl_type_origin(new))); | |
1104 | ovl_dentry_version_inc(new->d_parent, ovl_type_origin(old) || | |
1105 | (d_inode(new) && ovl_type_origin(new))); | |
e9be9d5e MS |
1106 | |
1107 | out_dput: | |
1108 | dput(newdentry); | |
11f37104 MS |
1109 | out_dput_old: |
1110 | dput(olddentry); | |
e9be9d5e MS |
1111 | out_unlock: |
1112 | unlock_rename(new_upperdir, old_upperdir); | |
1113 | out_revert_creds: | |
1175b6b8 | 1114 | revert_creds(old_cred); |
5f8415d6 | 1115 | ovl_nlink_end(new, locked); |
e9be9d5e MS |
1116 | out_drop_write: |
1117 | ovl_drop_write(old); | |
1118 | out: | |
1119 | dput(opaquedir); | |
6d0a8a90 | 1120 | ovl_cache_free(&list); |
e9be9d5e MS |
1121 | return err; |
1122 | } | |
1123 | ||
1124 | const struct inode_operations ovl_dir_inode_operations = { | |
1125 | .lookup = ovl_lookup, | |
1126 | .mkdir = ovl_mkdir, | |
1127 | .symlink = ovl_symlink, | |
1128 | .unlink = ovl_unlink, | |
1129 | .rmdir = ovl_rmdir, | |
6c02cb59 | 1130 | .rename = ovl_rename, |
e9be9d5e MS |
1131 | .link = ovl_link, |
1132 | .setattr = ovl_setattr, | |
1133 | .create = ovl_create, | |
1134 | .mknod = ovl_mknod, | |
1135 | .permission = ovl_permission, | |
5b712091 | 1136 | .getattr = ovl_getattr, |
e9be9d5e | 1137 | .listxattr = ovl_listxattr, |
39a25b2b | 1138 | .get_acl = ovl_get_acl, |
d719e8f2 | 1139 | .update_time = ovl_update_time, |
e9be9d5e | 1140 | }; |