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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>
15#include "overlayfs.h"
16
17void ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
18{
19 int err;
20
21 dget(wdentry);
22 if (d_is_dir(wdentry))
23 err = ovl_do_rmdir(wdir, wdentry);
24 else
25 err = ovl_do_unlink(wdir, wdentry);
26 dput(wdentry);
27
28 if (err) {
29 pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n",
30 wdentry, err);
31 }
32}
33
34struct dentry *ovl_lookup_temp(struct dentry *workdir, struct dentry *dentry)
35{
36 struct dentry *temp;
37 char name[20];
38
39 snprintf(name, sizeof(name), "#%lx", (unsigned long) dentry);
40
41 temp = lookup_one_len(name, workdir, strlen(name));
42 if (!IS_ERR(temp) && temp->d_inode) {
43 pr_err("overlayfs: workdir/%s already exists\n", name);
44 dput(temp);
45 temp = ERR_PTR(-EIO);
46 }
47
48 return temp;
49}
50
51
52static struct dentry *ovl_whiteout(struct dentry *workdir,
53 struct dentry *dentry)
54{
55 int err;
56 struct dentry *whiteout;
57 struct inode *wdir = workdir->d_inode;
58
59 whiteout = ovl_lookup_temp(workdir, dentry);
60 if (IS_ERR(whiteout))
61 return whiteout;
62
63 err = ovl_do_whiteout(wdir, whiteout);
64 if (err) {
65 dput(whiteout);
66 whiteout = ERR_PTR(err);
67 }
68
69 return whiteout;
70}
71
72int ovl_create_real(struct inode *dir, struct dentry *newdentry,
73 struct kstat *stat, const char *link,
74 struct dentry *hardlink, bool debug)
75{
76 int err;
77
78 if (newdentry->d_inode)
79 return -ESTALE;
80
81 if (hardlink) {
82 err = ovl_do_link(hardlink, dir, newdentry, debug);
83 } else {
84 switch (stat->mode & S_IFMT) {
85 case S_IFREG:
86 err = ovl_do_create(dir, newdentry, stat->mode, debug);
87 break;
88
89 case S_IFDIR:
90 err = ovl_do_mkdir(dir, newdentry, stat->mode, debug);
91 break;
92
93 case S_IFCHR:
94 case S_IFBLK:
95 case S_IFIFO:
96 case S_IFSOCK:
97 err = ovl_do_mknod(dir, newdentry,
98 stat->mode, stat->rdev, debug);
99 break;
100
101 case S_IFLNK:
102 err = ovl_do_symlink(dir, newdentry, link, debug);
103 break;
104
105 default:
106 err = -EPERM;
107 }
108 }
109 if (!err && WARN_ON(!newdentry->d_inode)) {
110
111
112
113
114 err = -ENOENT;
115 }
116 return err;
117}
118
119static int ovl_set_opaque(struct dentry *upperdentry)
120{
121 return ovl_do_setxattr(upperdentry, OVL_XATTR_OPAQUE, "y", 1, 0);
122}
123
124static void ovl_remove_opaque(struct dentry *upperdentry)
125{
126 int err;
127
128 err = ovl_do_removexattr(upperdentry, OVL_XATTR_OPAQUE);
129 if (err) {
130 pr_warn("overlayfs: failed to remove opaque from '%s' (%i)\n",
131 upperdentry->d_name.name, err);
132 }
133}
134
135static int ovl_dir_getattr(struct vfsmount *mnt, struct dentry *dentry,
136 struct kstat *stat)
137{
138 int err;
139 enum ovl_path_type type;
140 struct path realpath;
141
142 type = ovl_path_real(dentry, &realpath);
143 err = vfs_getattr(&realpath, stat);
144 if (err)
145 return err;
146
147 stat->dev = dentry->d_sb->s_dev;
148 stat->ino = dentry->d_inode->i_ino;
149
150
151
152
153
154
155 if (OVL_TYPE_MERGE(type))
156 stat->nlink = 1;
157
158 return 0;
159}
160
161static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
162 struct kstat *stat, const char *link,
163 struct dentry *hardlink)
164{
165 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
166 struct inode *udir = upperdir->d_inode;
167 struct dentry *newdentry;
168 int err;
169
170 inode_lock_nested(udir, I_MUTEX_PARENT);
171 newdentry = lookup_one_len(dentry->d_name.name, upperdir,
172 dentry->d_name.len);
173 err = PTR_ERR(newdentry);
174 if (IS_ERR(newdentry))
175 goto out_unlock;
176 err = ovl_create_real(udir, newdentry, stat, link, hardlink, false);
177 if (err)
178 goto out_dput;
179
180 ovl_dentry_version_inc(dentry->d_parent);
181 ovl_dentry_update(dentry, newdentry);
182 ovl_copyattr(newdentry->d_inode, inode);
183 d_instantiate(dentry, inode);
184 newdentry = NULL;
185out_dput:
186 dput(newdentry);
187out_unlock:
188 inode_unlock(udir);
189 return err;
190}
191
192static int ovl_lock_rename_workdir(struct dentry *workdir,
193 struct dentry *upperdir)
194{
195
196 if (workdir == upperdir)
197 goto err;
198
199
200 if (lock_rename(workdir, upperdir) != NULL)
201 goto err_unlock;
202
203 return 0;
204
205err_unlock:
206 unlock_rename(workdir, upperdir);
207err:
208 pr_err("overlayfs: failed to lock workdir+upperdir\n");
209 return -EIO;
210}
211
212static struct dentry *ovl_clear_empty(struct dentry *dentry,
213 struct list_head *list)
214{
215 struct dentry *workdir = ovl_workdir(dentry);
216 struct inode *wdir = workdir->d_inode;
217 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
218 struct inode *udir = upperdir->d_inode;
219 struct path upperpath;
220 struct dentry *upper;
221 struct dentry *opaquedir;
222 struct kstat stat;
223 int err;
224
225 if (WARN_ON(!workdir))
226 return ERR_PTR(-EROFS);
227
228 err = ovl_lock_rename_workdir(workdir, upperdir);
229 if (err)
230 goto out;
231
232 ovl_path_upper(dentry, &upperpath);
233 err = vfs_getattr(&upperpath, &stat);
234 if (err)
235 goto out_unlock;
236
237 err = -ESTALE;
238 if (!S_ISDIR(stat.mode))
239 goto out_unlock;
240 upper = upperpath.dentry;
241 if (upper->d_parent->d_inode != udir)
242 goto out_unlock;
243
244 opaquedir = ovl_lookup_temp(workdir, dentry);
245 err = PTR_ERR(opaquedir);
246 if (IS_ERR(opaquedir))
247 goto out_unlock;
248
249 err = ovl_create_real(wdir, opaquedir, &stat, NULL, NULL, true);
250 if (err)
251 goto out_dput;
252
253 err = ovl_copy_xattr(upper, opaquedir);
254 if (err)
255 goto out_cleanup;
256
257 err = ovl_set_opaque(opaquedir);
258 if (err)
259 goto out_cleanup;
260
261 inode_lock(opaquedir->d_inode);
262 err = ovl_set_attr(opaquedir, &stat);
263 inode_unlock(opaquedir->d_inode);
264 if (err)
265 goto out_cleanup;
266
267 err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
268 if (err)
269 goto out_cleanup;
270
271 ovl_cleanup_whiteouts(upper, list);
272 ovl_cleanup(wdir, upper);
273 unlock_rename(workdir, upperdir);
274
275
276 d_drop(dentry);
277
278 return opaquedir;
279
280out_cleanup:
281 ovl_cleanup(wdir, opaquedir);
282out_dput:
283 dput(opaquedir);
284out_unlock:
285 unlock_rename(workdir, upperdir);
286out:
287 return ERR_PTR(err);
288}
289
290static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry)
291{
292 int err;
293 struct dentry *ret = NULL;
294 LIST_HEAD(list);
295
296 err = ovl_check_empty_dir(dentry, &list);
297 if (err)
298 ret = ERR_PTR(err);
299 else {
300
301
302
303
304
305
306
307 if (ovl_dentry_upper(dentry))
308 ret = ovl_clear_empty(dentry, &list);
309 }
310
311 ovl_cache_free(&list);
312
313 return ret;
314}
315
316static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
317 struct kstat *stat, const char *link,
318 struct dentry *hardlink)
319{
320 struct dentry *workdir = ovl_workdir(dentry);
321 struct inode *wdir = workdir->d_inode;
322 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
323 struct inode *udir = upperdir->d_inode;
324 struct dentry *upper;
325 struct dentry *newdentry;
326 int err;
327
328 if (WARN_ON(!workdir))
329 return -EROFS;
330
331 err = ovl_lock_rename_workdir(workdir, upperdir);
332 if (err)
333 goto out;
334
335 newdentry = ovl_lookup_temp(workdir, dentry);
336 err = PTR_ERR(newdentry);
337 if (IS_ERR(newdentry))
338 goto out_unlock;
339
340 upper = lookup_one_len(dentry->d_name.name, upperdir,
341 dentry->d_name.len);
342 err = PTR_ERR(upper);
343 if (IS_ERR(upper))
344 goto out_dput;
345
346 err = ovl_create_real(wdir, newdentry, stat, link, hardlink, true);
347 if (err)
348 goto out_dput2;
349
350 if (S_ISDIR(stat->mode)) {
351 err = ovl_set_opaque(newdentry);
352 if (err)
353 goto out_cleanup;
354
355 err = ovl_do_rename(wdir, newdentry, udir, upper,
356 RENAME_EXCHANGE);
357 if (err)
358 goto out_cleanup;
359
360 ovl_cleanup(wdir, upper);
361 } else {
362 err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
363 if (err)
364 goto out_cleanup;
365 }
366 ovl_dentry_version_inc(dentry->d_parent);
367 ovl_dentry_update(dentry, newdentry);
368 ovl_copyattr(newdentry->d_inode, inode);
369 d_instantiate(dentry, inode);
370 newdentry = NULL;
371out_dput2:
372 dput(upper);
373out_dput:
374 dput(newdentry);
375out_unlock:
376 unlock_rename(workdir, upperdir);
377out:
378 return err;
379
380out_cleanup:
381 ovl_cleanup(wdir, newdentry);
382 goto out_dput2;
383}
384
385static int ovl_create_or_link(struct dentry *dentry, int mode, dev_t rdev,
386 const char *link, struct dentry *hardlink)
387{
388 int err;
389 struct inode *inode;
390 struct kstat stat = {
391 .mode = mode,
392 .rdev = rdev,
393 };
394
395 err = -ENOMEM;
396 inode = ovl_new_inode(dentry->d_sb, mode, dentry->d_fsdata);
397 if (!inode)
398 goto out;
399
400 err = ovl_copy_up(dentry->d_parent);
401 if (err)
402 goto out_iput;
403
404 if (!ovl_dentry_is_opaque(dentry)) {
405 err = ovl_create_upper(dentry, inode, &stat, link, hardlink);
406 } else {
407 const struct cred *old_cred;
408 struct cred *override_cred;
409
410 old_cred = ovl_override_creds(dentry->d_sb);
411
412 err = -ENOMEM;
413 override_cred = prepare_creds();
414 if (override_cred) {
415 override_cred->fsuid = old_cred->fsuid;
416 override_cred->fsgid = old_cred->fsgid;
417 put_cred(override_creds(override_cred));
418 put_cred(override_cred);
419
420 err = ovl_create_over_whiteout(dentry, inode, &stat,
421 link, hardlink);
422 }
423 revert_creds(old_cred);
424 }
425
426 if (!err)
427 inode = NULL;
428out_iput:
429 iput(inode);
430out:
431 return err;
432}
433
434static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
435 const char *link)
436{
437 int err;
438
439 err = ovl_want_write(dentry);
440 if (!err) {
441 err = ovl_create_or_link(dentry, mode, rdev, link, NULL);
442 ovl_drop_write(dentry);
443 }
444
445 return err;
446}
447
448static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
449 bool excl)
450{
451 return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
452}
453
454static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
455{
456 return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
457}
458
459static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
460 dev_t rdev)
461{
462
463 if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
464 return -EPERM;
465
466 return ovl_create_object(dentry, mode, rdev, NULL);
467}
468
469static int ovl_symlink(struct inode *dir, struct dentry *dentry,
470 const char *link)
471{
472 return ovl_create_object(dentry, S_IFLNK, 0, link);
473}
474
475static int ovl_link(struct dentry *old, struct inode *newdir,
476 struct dentry *new)
477{
478 int err;
479 struct dentry *upper;
480
481 err = ovl_want_write(old);
482 if (err)
483 goto out;
484
485 err = ovl_copy_up(old);
486 if (err)
487 goto out_drop_write;
488
489 upper = ovl_dentry_upper(old);
490 err = ovl_create_or_link(new, upper->d_inode->i_mode, 0, NULL, upper);
491
492out_drop_write:
493 ovl_drop_write(old);
494out:
495 return err;
496}
497
498static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)
499{
500 struct dentry *workdir = ovl_workdir(dentry);
501 struct inode *wdir = workdir->d_inode;
502 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
503 struct inode *udir = upperdir->d_inode;
504 struct dentry *whiteout;
505 struct dentry *upper;
506 struct dentry *opaquedir = NULL;
507 int err;
508 int flags = 0;
509
510 if (WARN_ON(!workdir))
511 return -EROFS;
512
513 if (is_dir) {
514 if (OVL_TYPE_MERGE_OR_LOWER(ovl_path_type(dentry))) {
515 opaquedir = ovl_check_empty_and_clear(dentry);
516 err = PTR_ERR(opaquedir);
517 if (IS_ERR(opaquedir))
518 goto out;
519 } else {
520 LIST_HEAD(list);
521
522
523
524
525
526
527 err = ovl_check_empty_dir(dentry, &list);
528 ovl_cache_free(&list);
529 if (err)
530 goto out;
531 }
532 }
533
534 err = ovl_lock_rename_workdir(workdir, upperdir);
535 if (err)
536 goto out_dput;
537
538 upper = lookup_one_len(dentry->d_name.name, upperdir,
539 dentry->d_name.len);
540 err = PTR_ERR(upper);
541 if (IS_ERR(upper))
542 goto out_unlock;
543
544 err = -ESTALE;
545 if ((opaquedir && upper != opaquedir) ||
546 (!opaquedir && ovl_dentry_upper(dentry) &&
547 upper != ovl_dentry_upper(dentry))) {
548 goto out_dput_upper;
549 }
550
551 whiteout = ovl_whiteout(workdir, dentry);
552 err = PTR_ERR(whiteout);
553 if (IS_ERR(whiteout))
554 goto out_dput_upper;
555
556 if (d_is_dir(upper))
557 flags = RENAME_EXCHANGE;
558
559 err = ovl_do_rename(wdir, whiteout, udir, upper, flags);
560 if (err)
561 goto kill_whiteout;
562 if (flags)
563 ovl_cleanup(wdir, upper);
564
565 ovl_dentry_version_inc(dentry->d_parent);
566out_d_drop:
567 d_drop(dentry);
568 dput(whiteout);
569out_dput_upper:
570 dput(upper);
571out_unlock:
572 unlock_rename(workdir, upperdir);
573out_dput:
574 dput(opaquedir);
575out:
576 return err;
577
578kill_whiteout:
579 ovl_cleanup(wdir, whiteout);
580 goto out_d_drop;
581}
582
583static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
584{
585 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
586 struct inode *dir = upperdir->d_inode;
587 struct dentry *upper;
588 int err;
589
590 inode_lock_nested(dir, I_MUTEX_PARENT);
591 upper = lookup_one_len(dentry->d_name.name, upperdir,
592 dentry->d_name.len);
593 err = PTR_ERR(upper);
594 if (IS_ERR(upper))
595 goto out_unlock;
596
597 err = -ESTALE;
598 if (upper == ovl_dentry_upper(dentry)) {
599 if (is_dir)
600 err = vfs_rmdir(dir, upper);
601 else
602 err = vfs_unlink(dir, upper, NULL);
603 ovl_dentry_version_inc(dentry->d_parent);
604 }
605 dput(upper);
606
607
608
609
610
611
612
613 if (!err)
614 d_drop(dentry);
615out_unlock:
616 inode_unlock(dir);
617
618 return err;
619}
620
621static inline int ovl_check_sticky(struct dentry *dentry)
622{
623 struct inode *dir = ovl_dentry_real(dentry->d_parent)->d_inode;
624 struct inode *inode = ovl_dentry_real(dentry)->d_inode;
625
626 if (check_sticky(dir, inode))
627 return -EPERM;
628
629 return 0;
630}
631
632static int ovl_do_remove(struct dentry *dentry, bool is_dir)
633{
634 enum ovl_path_type type;
635 int err;
636
637 err = ovl_check_sticky(dentry);
638 if (err)
639 goto out;
640
641 err = ovl_want_write(dentry);
642 if (err)
643 goto out;
644
645 err = ovl_copy_up(dentry->d_parent);
646 if (err)
647 goto out_drop_write;
648
649 type = ovl_path_type(dentry);
650 if (OVL_TYPE_PURE_UPPER(type)) {
651 err = ovl_remove_upper(dentry, is_dir);
652 } else {
653 const struct cred *old_cred = ovl_override_creds(dentry->d_sb);
654
655 err = ovl_remove_and_whiteout(dentry, is_dir);
656
657 revert_creds(old_cred);
658 }
659out_drop_write:
660 ovl_drop_write(dentry);
661out:
662 return err;
663}
664
665static int ovl_unlink(struct inode *dir, struct dentry *dentry)
666{
667 return ovl_do_remove(dentry, false);
668}
669
670static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
671{
672 return ovl_do_remove(dentry, true);
673}
674
675static int ovl_rename2(struct inode *olddir, struct dentry *old,
676 struct inode *newdir, struct dentry *new,
677 unsigned int flags)
678{
679 int err;
680 enum ovl_path_type old_type;
681 enum ovl_path_type new_type;
682 struct dentry *old_upperdir;
683 struct dentry *new_upperdir;
684 struct dentry *olddentry;
685 struct dentry *newdentry;
686 struct dentry *trap;
687 bool old_opaque;
688 bool new_opaque;
689 bool cleanup_whiteout = false;
690 bool overwrite = !(flags & RENAME_EXCHANGE);
691 bool is_dir = d_is_dir(old);
692 bool new_is_dir = false;
693 struct dentry *opaquedir = NULL;
694 const struct cred *old_cred = NULL;
695
696 err = -EINVAL;
697 if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
698 goto out;
699
700 flags &= ~RENAME_NOREPLACE;
701
702 err = ovl_check_sticky(old);
703 if (err)
704 goto out;
705
706
707 old_type = ovl_path_type(old);
708 err = -EXDEV;
709 if (OVL_TYPE_MERGE_OR_LOWER(old_type) && is_dir)
710 goto out;
711
712 if (new->d_inode) {
713 err = ovl_check_sticky(new);
714 if (err)
715 goto out;
716
717 if (d_is_dir(new))
718 new_is_dir = true;
719
720 new_type = ovl_path_type(new);
721 err = -EXDEV;
722 if (!overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir)
723 goto out;
724
725 err = 0;
726 if (!OVL_TYPE_UPPER(new_type) && !OVL_TYPE_UPPER(old_type)) {
727 if (ovl_dentry_lower(old)->d_inode ==
728 ovl_dentry_lower(new)->d_inode)
729 goto out;
730 }
731 if (OVL_TYPE_UPPER(new_type) && OVL_TYPE_UPPER(old_type)) {
732 if (ovl_dentry_upper(old)->d_inode ==
733 ovl_dentry_upper(new)->d_inode)
734 goto out;
735 }
736 } else {
737 if (ovl_dentry_is_opaque(new))
738 new_type = __OVL_PATH_UPPER;
739 else
740 new_type = __OVL_PATH_UPPER | __OVL_PATH_PURE;
741 }
742
743 err = ovl_want_write(old);
744 if (err)
745 goto out;
746
747 err = ovl_copy_up(old);
748 if (err)
749 goto out_drop_write;
750
751 err = ovl_copy_up(new->d_parent);
752 if (err)
753 goto out_drop_write;
754 if (!overwrite) {
755 err = ovl_copy_up(new);
756 if (err)
757 goto out_drop_write;
758 }
759
760 old_opaque = !OVL_TYPE_PURE_UPPER(old_type);
761 new_opaque = !OVL_TYPE_PURE_UPPER(new_type);
762
763 if (old_opaque || new_opaque)
764 old_cred = ovl_override_creds(old->d_sb);
765
766 if (overwrite && OVL_TYPE_MERGE_OR_LOWER(new_type) && new_is_dir) {
767 opaquedir = ovl_check_empty_and_clear(new);
768 err = PTR_ERR(opaquedir);
769 if (IS_ERR(opaquedir)) {
770 opaquedir = NULL;
771 goto out_revert_creds;
772 }
773 }
774
775 if (overwrite) {
776 if (old_opaque) {
777 if (new->d_inode || !new_opaque) {
778
779 flags |= RENAME_WHITEOUT;
780 } else {
781
782 flags |= RENAME_EXCHANGE;
783 }
784 } else if (is_dir && !new->d_inode && new_opaque) {
785 flags |= RENAME_EXCHANGE;
786 cleanup_whiteout = true;
787 }
788 }
789
790 old_upperdir = ovl_dentry_upper(old->d_parent);
791 new_upperdir = ovl_dentry_upper(new->d_parent);
792
793 trap = lock_rename(new_upperdir, old_upperdir);
794
795
796 olddentry = lookup_one_len(old->d_name.name, old_upperdir,
797 old->d_name.len);
798 err = PTR_ERR(olddentry);
799 if (IS_ERR(olddentry))
800 goto out_unlock;
801
802 err = -ESTALE;
803 if (olddentry != ovl_dentry_upper(old))
804 goto out_dput_old;
805
806 newdentry = lookup_one_len(new->d_name.name, new_upperdir,
807 new->d_name.len);
808 err = PTR_ERR(newdentry);
809 if (IS_ERR(newdentry))
810 goto out_dput_old;
811
812 err = -ESTALE;
813 if (ovl_dentry_upper(new)) {
814 if (opaquedir) {
815 if (newdentry != opaquedir)
816 goto out_dput;
817 } else {
818 if (newdentry != ovl_dentry_upper(new))
819 goto out_dput;
820 }
821 } else {
822 if (!d_is_negative(newdentry) &&
823 (!new_opaque || !ovl_is_whiteout(newdentry)))
824 goto out_dput;
825 }
826
827 if (olddentry == trap)
828 goto out_dput;
829 if (newdentry == trap)
830 goto out_dput;
831
832 if (is_dir && !old_opaque && new_opaque) {
833 err = ovl_set_opaque(olddentry);
834 if (err)
835 goto out_dput;
836 }
837 if (!overwrite && new_is_dir && old_opaque && !new_opaque) {
838 err = ovl_set_opaque(newdentry);
839 if (err)
840 goto out_dput;
841 }
842
843 if (old_opaque || new_opaque) {
844 err = ovl_do_rename(old_upperdir->d_inode, olddentry,
845 new_upperdir->d_inode, newdentry,
846 flags);
847 } else {
848
849 BUG_ON(flags & ~RENAME_EXCHANGE);
850 err = vfs_rename(old_upperdir->d_inode, olddentry,
851 new_upperdir->d_inode, newdentry,
852 NULL, flags);
853 }
854
855 if (err) {
856 if (is_dir && !old_opaque && new_opaque)
857 ovl_remove_opaque(olddentry);
858 if (!overwrite && new_is_dir && old_opaque && !new_opaque)
859 ovl_remove_opaque(newdentry);
860 goto out_dput;
861 }
862
863 if (is_dir && old_opaque && !new_opaque)
864 ovl_remove_opaque(olddentry);
865 if (!overwrite && new_is_dir && !old_opaque && new_opaque)
866 ovl_remove_opaque(newdentry);
867
868
869
870
871
872
873
874
875 if (old_opaque != new_opaque) {
876 ovl_dentry_set_opaque(old, new_opaque);
877 if (!overwrite)
878 ovl_dentry_set_opaque(new, old_opaque);
879 }
880
881 if (cleanup_whiteout)
882 ovl_cleanup(old_upperdir->d_inode, newdentry);
883
884 ovl_dentry_version_inc(old->d_parent);
885 ovl_dentry_version_inc(new->d_parent);
886
887out_dput:
888 dput(newdentry);
889out_dput_old:
890 dput(olddentry);
891out_unlock:
892 unlock_rename(new_upperdir, old_upperdir);
893out_revert_creds:
894 if (old_opaque || new_opaque)
895 revert_creds(old_cred);
896out_drop_write:
897 ovl_drop_write(old);
898out:
899 dput(opaquedir);
900 return err;
901}
902
903const struct inode_operations ovl_dir_inode_operations = {
904 .lookup = ovl_lookup,
905 .mkdir = ovl_mkdir,
906 .symlink = ovl_symlink,
907 .unlink = ovl_unlink,
908 .rmdir = ovl_rmdir,
909 .rename2 = ovl_rename2,
910 .link = ovl_link,
911 .setattr = ovl_setattr,
912 .create = ovl_create,
913 .mknod = ovl_mknod,
914 .permission = ovl_permission,
915 .getattr = ovl_dir_getattr,
916 .setxattr = ovl_setxattr,
917 .getxattr = ovl_getxattr,
918 .listxattr = ovl_listxattr,
919 .removexattr = ovl_removexattr,
920};
921
