3 * Copyright (C) 2011 Novell Inc.
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.
11 #include <linux/namei.h>
12 #include <linux/xattr.h>
13 #include <linux/security.h>
14 #include <linux/cred.h>
15 #include <linux/module.h>
16 #include <linux/posix_acl.h>
17 #include <linux/posix_acl_xattr.h>
18 #include <linux/atomic.h>
19 #include <linux/ratelimit.h>
20 #include "overlayfs.h"
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");
27 void ovl_cleanup(struct inode
*wdir
, struct dentry
*wdentry
)
32 if (d_is_dir(wdentry
))
33 err
= ovl_do_rmdir(wdir
, wdentry
);
35 err
= ovl_do_unlink(wdir
, wdentry
);
39 pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n",
44 struct dentry
*ovl_lookup_temp(struct dentry
*workdir
, struct dentry
*dentry
)
48 static atomic_t temp_id
= ATOMIC_INIT(0);
50 /* counter is allowed to wrap, since temp dentries are ephemeral */
51 snprintf(name
, sizeof(name
), "#%x", atomic_inc_return(&temp_id
));
53 temp
= lookup_one_len(name
, workdir
, strlen(name
));
54 if (!IS_ERR(temp
) && temp
->d_inode
) {
55 pr_err("overlayfs: workdir/%s already exists\n", name
);
63 /* caller holds i_mutex on workdir */
64 static struct dentry
*ovl_whiteout(struct dentry
*workdir
,
65 struct dentry
*dentry
)
68 struct dentry
*whiteout
;
69 struct inode
*wdir
= workdir
->d_inode
;
71 whiteout
= ovl_lookup_temp(workdir
, dentry
);
75 err
= ovl_do_whiteout(wdir
, whiteout
);
78 whiteout
= ERR_PTR(err
);
84 int ovl_create_real(struct inode
*dir
, struct dentry
*newdentry
,
85 struct cattr
*attr
, struct dentry
*hardlink
, bool debug
)
89 if (newdentry
->d_inode
)
93 err
= ovl_do_link(hardlink
, dir
, newdentry
, debug
);
95 switch (attr
->mode
& S_IFMT
) {
97 err
= ovl_do_create(dir
, newdentry
, attr
->mode
, debug
);
101 err
= ovl_do_mkdir(dir
, newdentry
, attr
->mode
, debug
);
108 err
= ovl_do_mknod(dir
, newdentry
,
109 attr
->mode
, attr
->rdev
, debug
);
113 err
= ovl_do_symlink(dir
, newdentry
, attr
->link
, debug
);
120 if (!err
&& WARN_ON(!newdentry
->d_inode
)) {
122 * Not quite sure if non-instantiated dentry is legal or not.
123 * VFS doesn't seem to care so check and warn here.
130 static int ovl_set_opaque(struct dentry
*dentry
, struct dentry
*upperdentry
)
134 err
= ovl_do_setxattr(upperdentry
, OVL_XATTR_OPAQUE
, "y", 1, 0);
136 ovl_dentry_set_opaque(dentry
);
141 /* Common operations required to be done after creation of file on upper */
142 static void ovl_instantiate(struct dentry
*dentry
, struct inode
*inode
,
143 struct dentry
*newdentry
, bool hardlink
)
145 ovl_dentry_version_inc(dentry
->d_parent
);
146 ovl_dentry_update(dentry
, newdentry
);
148 ovl_inode_update(inode
, d_inode(newdentry
));
149 ovl_copyattr(newdentry
->d_inode
, inode
);
151 WARN_ON(ovl_inode_real(inode
, NULL
) != d_inode(newdentry
));
154 d_instantiate(dentry
, inode
);
155 /* Force lookup of new upper hardlink to find its lower */
160 static bool ovl_type_merge(struct dentry
*dentry
)
162 return OVL_TYPE_MERGE(ovl_path_type(dentry
));
165 static int ovl_create_upper(struct dentry
*dentry
, struct inode
*inode
,
166 struct cattr
*attr
, struct dentry
*hardlink
)
168 struct dentry
*upperdir
= ovl_dentry_upper(dentry
->d_parent
);
169 struct inode
*udir
= upperdir
->d_inode
;
170 struct dentry
*newdentry
;
173 if (!hardlink
&& !IS_POSIXACL(udir
))
174 attr
->mode
&= ~current_umask();
176 inode_lock_nested(udir
, I_MUTEX_PARENT
);
177 newdentry
= lookup_one_len(dentry
->d_name
.name
, upperdir
,
179 err
= PTR_ERR(newdentry
);
180 if (IS_ERR(newdentry
))
182 err
= ovl_create_real(udir
, newdentry
, attr
, hardlink
, false);
186 if (ovl_type_merge(dentry
->d_parent
) && d_is_dir(newdentry
)) {
187 /* Setting opaque here is just an optimization, allow to fail */
188 ovl_set_opaque(dentry
, newdentry
);
191 ovl_instantiate(dentry
, inode
, newdentry
, !!hardlink
);
200 static int ovl_lock_rename_workdir(struct dentry
*workdir
,
201 struct dentry
*upperdir
)
203 /* Workdir should not be the same as upperdir */
204 if (workdir
== upperdir
)
207 /* Workdir should not be subdir of upperdir and vice versa */
208 if (lock_rename(workdir
, upperdir
) != NULL
)
214 unlock_rename(workdir
, upperdir
);
216 pr_err("overlayfs: failed to lock workdir+upperdir\n");
220 static struct dentry
*ovl_clear_empty(struct dentry
*dentry
,
221 struct list_head
*list
)
223 struct dentry
*workdir
= ovl_workdir(dentry
);
224 struct inode
*wdir
= workdir
->d_inode
;
225 struct dentry
*upperdir
= ovl_dentry_upper(dentry
->d_parent
);
226 struct inode
*udir
= upperdir
->d_inode
;
227 struct path upperpath
;
228 struct dentry
*upper
;
229 struct dentry
*opaquedir
;
233 if (WARN_ON(!workdir
))
234 return ERR_PTR(-EROFS
);
236 err
= ovl_lock_rename_workdir(workdir
, upperdir
);
240 ovl_path_upper(dentry
, &upperpath
);
241 err
= vfs_getattr(&upperpath
, &stat
,
242 STATX_BASIC_STATS
, AT_STATX_SYNC_AS_STAT
);
247 if (!S_ISDIR(stat
.mode
))
249 upper
= upperpath
.dentry
;
250 if (upper
->d_parent
->d_inode
!= udir
)
253 opaquedir
= ovl_lookup_temp(workdir
, dentry
);
254 err
= PTR_ERR(opaquedir
);
255 if (IS_ERR(opaquedir
))
258 err
= ovl_create_real(wdir
, opaquedir
,
259 &(struct cattr
){.mode
= stat
.mode
}, NULL
, true);
263 err
= ovl_copy_xattr(upper
, opaquedir
);
267 err
= ovl_set_opaque(dentry
, opaquedir
);
271 inode_lock(opaquedir
->d_inode
);
272 err
= ovl_set_attr(opaquedir
, &stat
);
273 inode_unlock(opaquedir
->d_inode
);
277 err
= ovl_do_rename(wdir
, opaquedir
, udir
, upper
, RENAME_EXCHANGE
);
281 ovl_cleanup_whiteouts(upper
, list
);
282 ovl_cleanup(wdir
, upper
);
283 unlock_rename(workdir
, upperdir
);
285 /* dentry's upper doesn't match now, get rid of it */
291 ovl_cleanup(wdir
, opaquedir
);
295 unlock_rename(workdir
, upperdir
);
300 static struct dentry
*ovl_check_empty_and_clear(struct dentry
*dentry
)
303 struct dentry
*ret
= NULL
;
304 enum ovl_path_type type
= ovl_path_type(dentry
);
307 err
= ovl_check_empty_dir(dentry
, &list
);
314 * When removing an empty opaque directory, then it makes no sense to
315 * replace it with an exact replica of itself.
317 * If no upperdentry then skip clearing whiteouts.
319 * Can race with copy-up, since we don't hold the upperdir mutex.
320 * Doesn't matter, since copy-up can't create a non-empty directory
323 if (OVL_TYPE_UPPER(type
) && OVL_TYPE_MERGE(type
))
324 ret
= ovl_clear_empty(dentry
, &list
);
327 ovl_cache_free(&list
);
332 static int ovl_set_upper_acl(struct dentry
*upperdentry
, const char *name
,
333 const struct posix_acl
*acl
)
339 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL
) || !acl
)
342 size
= posix_acl_to_xattr(NULL
, acl
, NULL
, 0);
343 buffer
= kmalloc(size
, GFP_KERNEL
);
347 size
= posix_acl_to_xattr(&init_user_ns
, acl
, buffer
, size
);
352 err
= vfs_setxattr(upperdentry
, name
, buffer
, size
, XATTR_CREATE
);
358 static int ovl_create_over_whiteout(struct dentry
*dentry
, struct inode
*inode
,
360 struct dentry
*hardlink
)
362 struct dentry
*workdir
= ovl_workdir(dentry
);
363 struct inode
*wdir
= workdir
->d_inode
;
364 struct dentry
*upperdir
= ovl_dentry_upper(dentry
->d_parent
);
365 struct inode
*udir
= upperdir
->d_inode
;
366 struct dentry
*upper
;
367 struct dentry
*newdentry
;
369 struct posix_acl
*acl
, *default_acl
;
371 if (WARN_ON(!workdir
))
375 err
= posix_acl_create(dentry
->d_parent
->d_inode
,
376 &cattr
->mode
, &default_acl
, &acl
);
381 err
= ovl_lock_rename_workdir(workdir
, upperdir
);
385 newdentry
= ovl_lookup_temp(workdir
, dentry
);
386 err
= PTR_ERR(newdentry
);
387 if (IS_ERR(newdentry
))
390 upper
= lookup_one_len(dentry
->d_name
.name
, upperdir
,
392 err
= PTR_ERR(upper
);
396 err
= ovl_create_real(wdir
, newdentry
, cattr
, hardlink
, true);
401 * mode could have been mutilated due to umask (e.g. sgid directory)
404 !S_ISLNK(cattr
->mode
) &&
405 newdentry
->d_inode
->i_mode
!= cattr
->mode
) {
406 struct iattr attr
= {
407 .ia_valid
= ATTR_MODE
,
408 .ia_mode
= cattr
->mode
,
410 inode_lock(newdentry
->d_inode
);
411 err
= notify_change(newdentry
, &attr
, NULL
);
412 inode_unlock(newdentry
->d_inode
);
417 err
= ovl_set_upper_acl(newdentry
, XATTR_NAME_POSIX_ACL_ACCESS
,
422 err
= ovl_set_upper_acl(newdentry
, XATTR_NAME_POSIX_ACL_DEFAULT
,
428 if (!hardlink
&& S_ISDIR(cattr
->mode
)) {
429 err
= ovl_set_opaque(dentry
, newdentry
);
433 err
= ovl_do_rename(wdir
, newdentry
, udir
, upper
,
438 ovl_cleanup(wdir
, upper
);
440 err
= ovl_do_rename(wdir
, newdentry
, udir
, upper
, 0);
444 ovl_instantiate(dentry
, inode
, newdentry
, !!hardlink
);
451 unlock_rename(workdir
, upperdir
);
454 posix_acl_release(acl
);
455 posix_acl_release(default_acl
);
460 ovl_cleanup(wdir
, newdentry
);
464 static int ovl_create_or_link(struct dentry
*dentry
, struct inode
*inode
,
465 struct cattr
*attr
, struct dentry
*hardlink
)
468 const struct cred
*old_cred
;
469 struct cred
*override_cred
;
471 err
= ovl_copy_up(dentry
->d_parent
);
475 old_cred
= ovl_override_creds(dentry
->d_sb
);
477 override_cred
= prepare_creds();
479 override_cred
->fsuid
= inode
->i_uid
;
480 override_cred
->fsgid
= inode
->i_gid
;
482 err
= security_dentry_create_files_as(dentry
,
483 attr
->mode
, &dentry
->d_name
, old_cred
,
486 put_cred(override_cred
);
487 goto out_revert_creds
;
490 put_cred(override_creds(override_cred
));
491 put_cred(override_cred
);
493 if (!ovl_dentry_is_whiteout(dentry
))
494 err
= ovl_create_upper(dentry
, inode
, attr
,
497 err
= ovl_create_over_whiteout(dentry
, inode
, attr
,
501 revert_creds(old_cred
);
503 struct inode
*realinode
= d_inode(ovl_dentry_upper(dentry
));
505 WARN_ON(inode
->i_mode
!= realinode
->i_mode
);
506 WARN_ON(!uid_eq(inode
->i_uid
, realinode
->i_uid
));
507 WARN_ON(!gid_eq(inode
->i_gid
, realinode
->i_gid
));
512 static int ovl_create_object(struct dentry
*dentry
, int mode
, dev_t rdev
,
517 struct cattr attr
= {
522 err
= ovl_want_write(dentry
);
527 inode
= ovl_new_inode(dentry
->d_sb
, mode
, rdev
);
531 inode_init_owner(inode
, dentry
->d_parent
->d_inode
, mode
);
532 attr
.mode
= inode
->i_mode
;
534 err
= ovl_create_or_link(dentry
, inode
, &attr
, NULL
);
539 ovl_drop_write(dentry
);
544 static int ovl_create(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
,
547 return ovl_create_object(dentry
, (mode
& 07777) | S_IFREG
, 0, NULL
);
550 static int ovl_mkdir(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
)
552 return ovl_create_object(dentry
, (mode
& 07777) | S_IFDIR
, 0, NULL
);
555 static int ovl_mknod(struct inode
*dir
, struct dentry
*dentry
, umode_t mode
,
558 /* Don't allow creation of "whiteout" on overlay */
559 if (S_ISCHR(mode
) && rdev
== WHITEOUT_DEV
)
562 return ovl_create_object(dentry
, mode
, rdev
, NULL
);
565 static int ovl_symlink(struct inode
*dir
, struct dentry
*dentry
,
568 return ovl_create_object(dentry
, S_IFLNK
, 0, link
);
571 static int ovl_link(struct dentry
*old
, struct inode
*newdir
,
577 err
= ovl_want_write(old
);
581 err
= ovl_copy_up(old
);
585 inode
= d_inode(old
);
588 err
= ovl_create_or_link(new, inode
, NULL
, ovl_dentry_upper(old
));
598 static int ovl_remove_and_whiteout(struct dentry
*dentry
, bool is_dir
)
600 struct dentry
*workdir
= ovl_workdir(dentry
);
601 struct inode
*wdir
= workdir
->d_inode
;
602 struct dentry
*upperdir
= ovl_dentry_upper(dentry
->d_parent
);
603 struct inode
*udir
= upperdir
->d_inode
;
604 struct dentry
*whiteout
;
605 struct dentry
*upper
;
606 struct dentry
*opaquedir
= NULL
;
610 if (WARN_ON(!workdir
))
614 opaquedir
= ovl_check_empty_and_clear(dentry
);
615 err
= PTR_ERR(opaquedir
);
616 if (IS_ERR(opaquedir
))
620 err
= ovl_lock_rename_workdir(workdir
, upperdir
);
624 upper
= lookup_one_len(dentry
->d_name
.name
, upperdir
,
626 err
= PTR_ERR(upper
);
631 if ((opaquedir
&& upper
!= opaquedir
) ||
632 (!opaquedir
&& ovl_dentry_upper(dentry
) &&
633 upper
!= ovl_dentry_upper(dentry
))) {
637 whiteout
= ovl_whiteout(workdir
, dentry
);
638 err
= PTR_ERR(whiteout
);
639 if (IS_ERR(whiteout
))
643 flags
= RENAME_EXCHANGE
;
645 err
= ovl_do_rename(wdir
, whiteout
, udir
, upper
, flags
);
649 ovl_cleanup(wdir
, upper
);
651 ovl_dentry_version_inc(dentry
->d_parent
);
658 unlock_rename(workdir
, upperdir
);
665 ovl_cleanup(wdir
, whiteout
);
669 static int ovl_remove_upper(struct dentry
*dentry
, bool is_dir
)
671 struct dentry
*upperdir
= ovl_dentry_upper(dentry
->d_parent
);
672 struct inode
*dir
= upperdir
->d_inode
;
673 struct dentry
*upper
;
674 struct dentry
*opaquedir
= NULL
;
677 /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */
678 if (is_dir
&& ovl_dentry_get_redirect(dentry
)) {
679 opaquedir
= ovl_check_empty_and_clear(dentry
);
680 err
= PTR_ERR(opaquedir
);
681 if (IS_ERR(opaquedir
))
685 inode_lock_nested(dir
, I_MUTEX_PARENT
);
686 upper
= lookup_one_len(dentry
->d_name
.name
, upperdir
,
688 err
= PTR_ERR(upper
);
693 if ((opaquedir
&& upper
!= opaquedir
) ||
694 (!opaquedir
&& upper
!= ovl_dentry_upper(dentry
)))
698 err
= vfs_rmdir(dir
, upper
);
700 err
= vfs_unlink(dir
, upper
, NULL
);
701 ovl_dentry_version_inc(dentry
->d_parent
);
704 * Keeping this dentry hashed would mean having to release
705 * upperpath/lowerpath, which could only be done if we are the
706 * sole user of this dentry. Too tricky... Just unhash for
720 static int ovl_do_remove(struct dentry
*dentry
, bool is_dir
)
722 enum ovl_path_type type
;
724 const struct cred
*old_cred
;
726 err
= ovl_want_write(dentry
);
730 err
= ovl_copy_up(dentry
->d_parent
);
734 type
= ovl_path_type(dentry
);
736 old_cred
= ovl_override_creds(dentry
->d_sb
);
737 if (!ovl_lower_positive(dentry
))
738 err
= ovl_remove_upper(dentry
, is_dir
);
740 err
= ovl_remove_and_whiteout(dentry
, is_dir
);
741 revert_creds(old_cred
);
744 clear_nlink(dentry
->d_inode
);
746 drop_nlink(dentry
->d_inode
);
749 ovl_drop_write(dentry
);
754 static int ovl_unlink(struct inode
*dir
, struct dentry
*dentry
)
756 return ovl_do_remove(dentry
, false);
759 static int ovl_rmdir(struct inode
*dir
, struct dentry
*dentry
)
761 return ovl_do_remove(dentry
, true);
764 static bool ovl_type_merge_or_lower(struct dentry
*dentry
)
766 enum ovl_path_type type
= ovl_path_type(dentry
);
768 return OVL_TYPE_MERGE(type
) || !OVL_TYPE_UPPER(type
);
771 static bool ovl_can_move(struct dentry
*dentry
)
773 return ovl_redirect_dir(dentry
->d_sb
) ||
774 !d_is_dir(dentry
) || !ovl_type_merge_or_lower(dentry
);
777 static char *ovl_get_redirect(struct dentry
*dentry
, bool samedir
)
780 struct dentry
*d
, *tmp
;
781 int buflen
= ovl_redirect_max
+ 1;
784 ret
= kstrndup(dentry
->d_name
.name
, dentry
->d_name
.len
,
789 buf
= ret
= kmalloc(buflen
, GFP_TEMPORARY
);
795 for (d
= dget(dentry
); !IS_ROOT(d
);) {
799 spin_lock(&d
->d_lock
);
800 name
= ovl_dentry_get_redirect(d
);
802 thislen
= strlen(name
);
804 name
= d
->d_name
.name
;
805 thislen
= d
->d_name
.len
;
808 /* If path is too long, fall back to userspace move */
809 if (thislen
+ (name
[0] != '/') > buflen
) {
810 ret
= ERR_PTR(-EXDEV
);
811 spin_unlock(&d
->d_lock
);
816 memcpy(&buf
[buflen
], name
, thislen
);
817 tmp
= dget_dlock(d
->d_parent
);
818 spin_unlock(&d
->d_lock
);
823 /* Absolute redirect: finished */
824 if (buf
[buflen
] == '/')
829 ret
= kstrdup(&buf
[buflen
], GFP_KERNEL
);
834 return ret
? ret
: ERR_PTR(-ENOMEM
);
837 static int ovl_set_redirect(struct dentry
*dentry
, bool samedir
)
840 const char *redirect
= ovl_dentry_get_redirect(dentry
);
842 if (redirect
&& (samedir
|| redirect
[0] == '/'))
845 redirect
= ovl_get_redirect(dentry
, samedir
);
846 if (IS_ERR(redirect
))
847 return PTR_ERR(redirect
);
849 err
= ovl_do_setxattr(ovl_dentry_upper(dentry
), OVL_XATTR_REDIRECT
,
850 redirect
, strlen(redirect
), 0);
852 spin_lock(&dentry
->d_lock
);
853 ovl_dentry_set_redirect(dentry
, redirect
);
854 spin_unlock(&dentry
->d_lock
);
857 if (err
== -EOPNOTSUPP
)
858 ovl_clear_redirect_dir(dentry
->d_sb
);
860 pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err
);
861 /* Fall back to userspace copy-up */
867 static int ovl_rename(struct inode
*olddir
, struct dentry
*old
,
868 struct inode
*newdir
, struct dentry
*new,
872 struct dentry
*old_upperdir
;
873 struct dentry
*new_upperdir
;
874 struct dentry
*olddentry
;
875 struct dentry
*newdentry
;
879 bool cleanup_whiteout
= false;
880 bool overwrite
= !(flags
& RENAME_EXCHANGE
);
881 bool is_dir
= d_is_dir(old
);
882 bool new_is_dir
= d_is_dir(new);
883 bool samedir
= olddir
== newdir
;
884 struct dentry
*opaquedir
= NULL
;
885 const struct cred
*old_cred
= NULL
;
888 if (flags
& ~(RENAME_EXCHANGE
| RENAME_NOREPLACE
))
891 flags
&= ~RENAME_NOREPLACE
;
893 /* Don't copy up directory trees */
895 if (!ovl_can_move(old
))
897 if (!overwrite
&& !ovl_can_move(new))
900 err
= ovl_want_write(old
);
904 err
= ovl_copy_up(old
);
908 err
= ovl_copy_up(new->d_parent
);
912 err
= ovl_copy_up(new);
917 old_cred
= ovl_override_creds(old
->d_sb
);
919 if (overwrite
&& new_is_dir
&& ovl_type_merge_or_lower(new)) {
920 opaquedir
= ovl_check_empty_and_clear(new);
921 err
= PTR_ERR(opaquedir
);
922 if (IS_ERR(opaquedir
)) {
924 goto out_revert_creds
;
929 if (ovl_lower_positive(old
)) {
930 if (!ovl_dentry_is_whiteout(new)) {
931 /* Whiteout source */
932 flags
|= RENAME_WHITEOUT
;
934 /* Switch whiteouts */
935 flags
|= RENAME_EXCHANGE
;
937 } else if (is_dir
&& ovl_dentry_is_whiteout(new)) {
938 flags
|= RENAME_EXCHANGE
;
939 cleanup_whiteout
= true;
943 old_upperdir
= ovl_dentry_upper(old
->d_parent
);
944 new_upperdir
= ovl_dentry_upper(new->d_parent
);
946 trap
= lock_rename(new_upperdir
, old_upperdir
);
948 olddentry
= lookup_one_len(old
->d_name
.name
, old_upperdir
,
950 err
= PTR_ERR(olddentry
);
951 if (IS_ERR(olddentry
))
955 if (olddentry
!= ovl_dentry_upper(old
))
958 newdentry
= lookup_one_len(new->d_name
.name
, new_upperdir
,
960 err
= PTR_ERR(newdentry
);
961 if (IS_ERR(newdentry
))
964 old_opaque
= ovl_dentry_is_opaque(old
);
965 new_opaque
= ovl_dentry_is_opaque(new);
968 if (ovl_dentry_upper(new)) {
970 if (newdentry
!= opaquedir
)
973 if (newdentry
!= ovl_dentry_upper(new))
977 if (!d_is_negative(newdentry
) &&
978 (!new_opaque
|| !ovl_is_whiteout(newdentry
)))
982 if (olddentry
== trap
)
984 if (newdentry
== trap
)
987 if (WARN_ON(olddentry
->d_inode
== newdentry
->d_inode
))
992 if (ovl_type_merge_or_lower(old
))
993 err
= ovl_set_redirect(old
, samedir
);
994 else if (!old_opaque
&& ovl_type_merge(new->d_parent
))
995 err
= ovl_set_opaque(old
, olddentry
);
999 if (!overwrite
&& new_is_dir
) {
1000 if (ovl_type_merge_or_lower(new))
1001 err
= ovl_set_redirect(new, samedir
);
1002 else if (!new_opaque
&& ovl_type_merge(old
->d_parent
))
1003 err
= ovl_set_opaque(new, newdentry
);
1008 err
= ovl_do_rename(old_upperdir
->d_inode
, olddentry
,
1009 new_upperdir
->d_inode
, newdentry
, flags
);
1013 if (cleanup_whiteout
)
1014 ovl_cleanup(old_upperdir
->d_inode
, newdentry
);
1016 ovl_dentry_version_inc(old
->d_parent
);
1017 ovl_dentry_version_inc(new->d_parent
);
1024 unlock_rename(new_upperdir
, old_upperdir
);
1026 revert_creds(old_cred
);
1028 ovl_drop_write(old
);
1034 const struct inode_operations ovl_dir_inode_operations
= {
1035 .lookup
= ovl_lookup
,
1037 .symlink
= ovl_symlink
,
1038 .unlink
= ovl_unlink
,
1040 .rename
= ovl_rename
,
1042 .setattr
= ovl_setattr
,
1043 .create
= ovl_create
,
1045 .permission
= ovl_permission
,
1046 .getattr
= ovl_getattr
,
1047 .listxattr
= ovl_listxattr
,
1048 .get_acl
= ovl_get_acl
,
1049 .update_time
= ovl_update_time
,