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/slab.h>
12 #include <linux/cred.h>
13 #include <linux/xattr.h>
14 #include <linux/posix_acl.h>
15 #include <linux/ratelimit.h>
16 #include "overlayfs.h"
19 int ovl_setattr(struct dentry
*dentry
, struct iattr
*attr
)
22 struct dentry
*upperdentry
;
23 const struct cred
*old_cred
;
26 * Check for permissions before trying to copy-up. This is redundant
27 * since it will be rechecked later by ->setattr() on upper dentry. But
28 * without this, copy-up can be triggered by just about anybody.
30 * We don't initialize inode->size, which just means that
31 * inode_newsize_ok() will always check against MAX_LFS_FILESIZE and not
32 * check for a swapfile (which this won't be anyway).
34 err
= setattr_prepare(dentry
, attr
);
38 err
= ovl_want_write(dentry
);
42 err
= ovl_copy_up(dentry
);
44 upperdentry
= ovl_dentry_upper(dentry
);
46 if (attr
->ia_valid
& (ATTR_KILL_SUID
|ATTR_KILL_SGID
))
47 attr
->ia_valid
&= ~ATTR_MODE
;
49 inode_lock(upperdentry
->d_inode
);
50 old_cred
= ovl_override_creds(dentry
->d_sb
);
51 err
= notify_change(upperdentry
, attr
, NULL
);
52 revert_creds(old_cred
);
54 ovl_copyattr(upperdentry
->d_inode
, dentry
->d_inode
);
55 inode_unlock(upperdentry
->d_inode
);
57 ovl_drop_write(dentry
);
62 static int ovl_map_dev_ino(struct dentry
*dentry
, struct kstat
*stat
,
63 struct ovl_layer
*lower_layer
)
65 bool samefs
= ovl_same_sb(dentry
->d_sb
);
66 unsigned int xinobits
= ovl_xino_bits(dentry
->d_sb
);
70 * When all layers are on the same fs, all real inode
71 * number are unique, so we use the overlay st_dev,
72 * which is friendly to du -x.
74 stat
->dev
= dentry
->d_sb
->s_dev
;
76 } else if (xinobits
) {
77 unsigned int shift
= 64 - xinobits
;
79 * All inode numbers of underlying fs should not be using the
80 * high xinobits, so we use high xinobits to partition the
81 * overlay st_ino address space. The high bits holds the fsid
82 * (upper fsid is 0). This way overlay inode numbers are unique
83 * and all inodes use overlay st_dev. Inode numbers are also
84 * persistent for a given layer configuration.
86 if (stat
->ino
>> shift
) {
87 pr_warn_ratelimited("overlayfs: inode number too big (%pd2, ino=%llu, xinobits=%d)\n",
88 dentry
, stat
->ino
, xinobits
);
91 stat
->ino
|= ((u64
)lower_layer
->fsid
) << shift
;
93 stat
->dev
= dentry
->d_sb
->s_dev
;
98 /* The inode could not be mapped to a unified st_ino address space */
99 if (S_ISDIR(dentry
->d_inode
->i_mode
)) {
101 * Always use the overlay st_dev for directories, so 'find
102 * -xdev' will scan the entire overlay mount and won't cross the
103 * overlay mount boundaries.
105 * If not all layers are on the same fs the pair {real st_ino;
106 * overlay st_dev} is not unique, so use the non persistent
107 * overlay st_ino for directories.
109 stat
->dev
= dentry
->d_sb
->s_dev
;
110 stat
->ino
= dentry
->d_inode
->i_ino
;
111 } else if (lower_layer
&& lower_layer
->fsid
) {
113 * For non-samefs setup, if we cannot map all layers st_ino
114 * to a unified address space, we need to make sure that st_dev
115 * is unique per lower fs. Upper layer uses real st_dev and
116 * lower layers use the unique anonymous bdev assigned to the
119 stat
->dev
= lower_layer
->fs
->pseudo_dev
;
125 int ovl_getattr(const struct path
*path
, struct kstat
*stat
,
126 u32 request_mask
, unsigned int flags
)
128 struct dentry
*dentry
= path
->dentry
;
129 enum ovl_path_type type
;
130 struct path realpath
;
131 const struct cred
*old_cred
;
132 bool is_dir
= S_ISDIR(dentry
->d_inode
->i_mode
);
133 bool samefs
= ovl_same_sb(dentry
->d_sb
);
134 struct ovl_layer
*lower_layer
= NULL
;
137 type
= ovl_path_real(dentry
, &realpath
);
138 old_cred
= ovl_override_creds(dentry
->d_sb
);
139 err
= vfs_getattr(&realpath
, stat
, request_mask
, flags
);
144 * For non-dir or same fs, we use st_ino of the copy up origin.
145 * This guaranties constant st_dev/st_ino across copy up.
146 * With xino feature and non-samefs, we use st_ino of the copy up
147 * origin masked with high bits that represent the layer id.
149 * If lower filesystem supports NFS file handles, this also guaranties
150 * persistent st_ino across mount cycle.
152 if (!is_dir
|| samefs
|| ovl_xino_bits(dentry
->d_sb
)) {
153 if (!OVL_TYPE_UPPER(type
)) {
154 lower_layer
= ovl_layer_lower(dentry
);
155 } else if (OVL_TYPE_ORIGIN(type
)) {
156 struct kstat lowerstat
;
157 u32 lowermask
= STATX_INO
| (!is_dir
? STATX_NLINK
: 0);
159 ovl_path_lower(dentry
, &realpath
);
160 err
= vfs_getattr(&realpath
, &lowerstat
,
166 * Lower hardlinks may be broken on copy up to different
167 * upper files, so we cannot use the lower origin st_ino
168 * for those different files, even for the same fs case.
170 * Similarly, several redirected dirs can point to the
171 * same dir on a lower layer. With the "verify_lower"
172 * feature, we do not use the lower origin st_ino, if
173 * we haven't verified that this redirect is unique.
175 * With inodes index enabled, it is safe to use st_ino
176 * of an indexed origin. The index validates that the
177 * upper hardlink is not broken and that a redirected
178 * dir is the only redirect to that origin.
180 if (ovl_test_flag(OVL_INDEX
, d_inode(dentry
)) ||
181 (!ovl_verify_lower(dentry
->d_sb
) &&
182 (is_dir
|| lowerstat
.nlink
== 1))) {
183 stat
->ino
= lowerstat
.ino
;
184 lower_layer
= ovl_layer_lower(dentry
);
189 err
= ovl_map_dev_ino(dentry
, stat
, lower_layer
);
194 * It's probably not worth it to count subdirs to get the
195 * correct link count. nlink=1 seems to pacify 'find' and
198 if (is_dir
&& OVL_TYPE_MERGE(type
))
202 * Return the overlay inode nlinks for indexed upper inodes.
203 * Overlay inode nlink counts the union of the upper hardlinks
204 * and non-covered lower hardlinks. It does not include the upper
207 if (!is_dir
&& ovl_test_flag(OVL_INDEX
, d_inode(dentry
)))
208 stat
->nlink
= dentry
->d_inode
->i_nlink
;
211 revert_creds(old_cred
);
216 int ovl_permission(struct inode
*inode
, int mask
)
218 struct inode
*upperinode
= ovl_inode_upper(inode
);
219 struct inode
*realinode
= upperinode
?: ovl_inode_lower(inode
);
220 const struct cred
*old_cred
;
223 /* Careful in RCU walk mode */
225 WARN_ON(!(mask
& MAY_NOT_BLOCK
));
230 * Check overlay inode with the creds of task and underlying inode
231 * with creds of mounter
233 err
= generic_permission(inode
, mask
);
237 old_cred
= ovl_override_creds(inode
->i_sb
);
239 !special_file(realinode
->i_mode
) && mask
& MAY_WRITE
) {
240 mask
&= ~(MAY_WRITE
| MAY_APPEND
);
241 /* Make sure mounter can read file for copy up later */
244 err
= inode_permission(realinode
, mask
);
245 revert_creds(old_cred
);
250 static const char *ovl_get_link(struct dentry
*dentry
,
252 struct delayed_call
*done
)
254 const struct cred
*old_cred
;
258 return ERR_PTR(-ECHILD
);
260 old_cred
= ovl_override_creds(dentry
->d_sb
);
261 p
= vfs_get_link(ovl_dentry_real(dentry
), done
);
262 revert_creds(old_cred
);
266 bool ovl_is_private_xattr(const char *name
)
268 return strncmp(name
, OVL_XATTR_PREFIX
,
269 sizeof(OVL_XATTR_PREFIX
) - 1) == 0;
272 int ovl_xattr_set(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
273 const void *value
, size_t size
, int flags
)
276 struct dentry
*upperdentry
= ovl_i_dentry_upper(inode
);
277 struct dentry
*realdentry
= upperdentry
?: ovl_dentry_lower(dentry
);
278 const struct cred
*old_cred
;
280 err
= ovl_want_write(dentry
);
284 if (!value
&& !upperdentry
) {
285 err
= vfs_getxattr(realdentry
, name
, NULL
, 0);
291 err
= ovl_copy_up(dentry
);
295 realdentry
= ovl_dentry_upper(dentry
);
298 old_cred
= ovl_override_creds(dentry
->d_sb
);
300 err
= vfs_setxattr(realdentry
, name
, value
, size
, flags
);
302 WARN_ON(flags
!= XATTR_REPLACE
);
303 err
= vfs_removexattr(realdentry
, name
);
305 revert_creds(old_cred
);
308 ovl_drop_write(dentry
);
313 int ovl_xattr_get(struct dentry
*dentry
, struct inode
*inode
, const char *name
,
314 void *value
, size_t size
)
317 const struct cred
*old_cred
;
318 struct dentry
*realdentry
=
319 ovl_i_dentry_upper(inode
) ?: ovl_dentry_lower(dentry
);
321 old_cred
= ovl_override_creds(dentry
->d_sb
);
322 res
= vfs_getxattr(realdentry
, name
, value
, size
);
323 revert_creds(old_cred
);
327 static bool ovl_can_list(const char *s
)
329 /* List all non-trusted xatts */
330 if (strncmp(s
, XATTR_TRUSTED_PREFIX
, XATTR_TRUSTED_PREFIX_LEN
) != 0)
333 /* Never list trusted.overlay, list other trusted for superuser only */
334 return !ovl_is_private_xattr(s
) && capable(CAP_SYS_ADMIN
);
337 ssize_t
ovl_listxattr(struct dentry
*dentry
, char *list
, size_t size
)
339 struct dentry
*realdentry
= ovl_dentry_real(dentry
);
343 const struct cred
*old_cred
;
345 old_cred
= ovl_override_creds(dentry
->d_sb
);
346 res
= vfs_listxattr(realdentry
, list
, size
);
347 revert_creds(old_cred
);
348 if (res
<= 0 || size
== 0)
351 /* filter out private xattrs */
352 for (s
= list
, len
= res
; len
;) {
353 size_t slen
= strnlen(s
, len
) + 1;
355 /* underlying fs providing us with an broken xattr list? */
356 if (WARN_ON(slen
> len
))
360 if (!ovl_can_list(s
)) {
362 memmove(s
, s
+ slen
, len
);
371 struct posix_acl
*ovl_get_acl(struct inode
*inode
, int type
)
373 struct inode
*realinode
= ovl_inode_real(inode
);
374 const struct cred
*old_cred
;
375 struct posix_acl
*acl
;
377 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL
) || !IS_POSIXACL(realinode
))
380 old_cred
= ovl_override_creds(inode
->i_sb
);
381 acl
= get_acl(realinode
, type
);
382 revert_creds(old_cred
);
387 static bool ovl_open_need_copy_up(struct dentry
*dentry
, int flags
)
389 /* Copy up of disconnected dentry does not set upper alias */
390 if (ovl_dentry_upper(dentry
) &&
391 (ovl_dentry_has_upper_alias(dentry
) ||
392 (dentry
->d_flags
& DCACHE_DISCONNECTED
)))
395 if (special_file(d_inode(dentry
)->i_mode
))
398 if (!(OPEN_FMODE(flags
) & FMODE_WRITE
) && !(flags
& O_TRUNC
))
404 int ovl_open_maybe_copy_up(struct dentry
*dentry
, unsigned int file_flags
)
408 if (ovl_open_need_copy_up(dentry
, file_flags
)) {
409 err
= ovl_want_write(dentry
);
411 err
= ovl_copy_up_flags(dentry
, file_flags
);
412 ovl_drop_write(dentry
);
419 int ovl_update_time(struct inode
*inode
, struct timespec
*ts
, int flags
)
421 if (flags
& S_ATIME
) {
422 struct ovl_fs
*ofs
= inode
->i_sb
->s_fs_info
;
423 struct path upperpath
= {
424 .mnt
= ofs
->upper_mnt
,
425 .dentry
= ovl_upperdentry_dereference(OVL_I(inode
)),
428 if (upperpath
.dentry
) {
429 touch_atime(&upperpath
);
430 inode
->i_atime
= d_inode(upperpath
.dentry
)->i_atime
;
436 static const struct inode_operations ovl_file_inode_operations
= {
437 .setattr
= ovl_setattr
,
438 .permission
= ovl_permission
,
439 .getattr
= ovl_getattr
,
440 .listxattr
= ovl_listxattr
,
441 .get_acl
= ovl_get_acl
,
442 .update_time
= ovl_update_time
,
445 static const struct inode_operations ovl_symlink_inode_operations
= {
446 .setattr
= ovl_setattr
,
447 .get_link
= ovl_get_link
,
448 .getattr
= ovl_getattr
,
449 .listxattr
= ovl_listxattr
,
450 .update_time
= ovl_update_time
,
454 * It is possible to stack overlayfs instance on top of another
455 * overlayfs instance as lower layer. We need to annonate the
456 * stackable i_mutex locks according to stack level of the super
457 * block instance. An overlayfs instance can never be in stack
458 * depth 0 (there is always a real fs below it). An overlayfs
459 * inode lock will use the lockdep annotaion ovl_i_mutex_key[depth].
461 * For example, here is a snip from /proc/lockdep_chains after
462 * dir_iterate of nested overlayfs:
464 * [...] &ovl_i_mutex_dir_key[depth] (stack_depth=2)
465 * [...] &ovl_i_mutex_dir_key[depth]#2 (stack_depth=1)
466 * [...] &type->i_mutex_dir_key (stack_depth=0)
468 #define OVL_MAX_NESTING FILESYSTEM_MAX_STACK_DEPTH
470 static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode
*inode
)
472 #ifdef CONFIG_LOCKDEP
473 static struct lock_class_key ovl_i_mutex_key
[OVL_MAX_NESTING
];
474 static struct lock_class_key ovl_i_mutex_dir_key
[OVL_MAX_NESTING
];
475 static struct lock_class_key ovl_i_lock_key
[OVL_MAX_NESTING
];
477 int depth
= inode
->i_sb
->s_stack_depth
- 1;
479 if (WARN_ON_ONCE(depth
< 0 || depth
>= OVL_MAX_NESTING
))
482 if (S_ISDIR(inode
->i_mode
))
483 lockdep_set_class(&inode
->i_rwsem
, &ovl_i_mutex_dir_key
[depth
]);
485 lockdep_set_class(&inode
->i_rwsem
, &ovl_i_mutex_key
[depth
]);
487 lockdep_set_class(&OVL_I(inode
)->lock
, &ovl_i_lock_key
[depth
]);
491 static void ovl_fill_inode(struct inode
*inode
, umode_t mode
, dev_t rdev
,
492 unsigned long ino
, int fsid
)
494 int xinobits
= ovl_xino_bits(inode
->i_sb
);
497 * When NFS export is enabled and d_ino is consistent with st_ino
498 * (samefs or i_ino has enough bits to encode layer), set the same
499 * value used for d_ino to i_ino, because nfsd readdirplus compares
500 * d_ino values to i_ino values of child entries. When called from
501 * ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
502 * upper inode i_ino on ovl_inode_init() or ovl_inode_update().
504 if (inode
->i_sb
->s_export_op
&&
505 (ovl_same_sb(inode
->i_sb
) || xinobits
)) {
507 if (xinobits
&& fsid
&& !(ino
>> (64 - xinobits
)))
508 inode
->i_ino
|= (unsigned long)fsid
<< (64 - xinobits
);
510 inode
->i_ino
= get_next_ino();
512 inode
->i_mode
= mode
;
513 inode
->i_flags
|= S_NOCMTIME
;
514 #ifdef CONFIG_FS_POSIX_ACL
515 inode
->i_acl
= inode
->i_default_acl
= ACL_DONT_CACHE
;
518 ovl_lockdep_annotate_inode_mutex_key(inode
);
520 switch (mode
& S_IFMT
) {
522 inode
->i_op
= &ovl_file_inode_operations
;
526 inode
->i_op
= &ovl_dir_inode_operations
;
527 inode
->i_fop
= &ovl_dir_operations
;
531 inode
->i_op
= &ovl_symlink_inode_operations
;
535 inode
->i_op
= &ovl_file_inode_operations
;
536 init_special_inode(inode
, mode
, rdev
);
542 * With inodes index enabled, an overlay inode nlink counts the union of upper
543 * hardlinks and non-covered lower hardlinks. During the lifetime of a non-pure
544 * upper inode, the following nlink modifying operations can happen:
546 * 1. Lower hardlink copy up
547 * 2. Upper hardlink created, unlinked or renamed over
548 * 3. Lower hardlink whiteout or renamed over
550 * For the first, copy up case, the union nlink does not change, whether the
551 * operation succeeds or fails, but the upper inode nlink may change.
552 * Therefore, before copy up, we store the union nlink value relative to the
553 * lower inode nlink in the index inode xattr trusted.overlay.nlink.
555 * For the second, upper hardlink case, the union nlink should be incremented
556 * or decremented IFF the operation succeeds, aligned with nlink change of the
557 * upper inode. Therefore, before link/unlink/rename, we store the union nlink
558 * value relative to the upper inode nlink in the index inode.
560 * For the last, lower cover up case, we simplify things by preceding the
561 * whiteout or cover up with copy up. This makes sure that there is an index
562 * upper inode where the nlink xattr can be stored before the copied up upper
565 #define OVL_NLINK_ADD_UPPER (1 << 0)
568 * On-disk format for indexed nlink:
570 * nlink relative to the upper inode - "U[+-]NUM"
571 * nlink relative to the lower inode - "L[+-]NUM"
574 static int ovl_set_nlink_common(struct dentry
*dentry
,
575 struct dentry
*realdentry
, const char *format
)
577 struct inode
*inode
= d_inode(dentry
);
578 struct inode
*realinode
= d_inode(realdentry
);
582 len
= snprintf(buf
, sizeof(buf
), format
,
583 (int) (inode
->i_nlink
- realinode
->i_nlink
));
585 if (WARN_ON(len
>= sizeof(buf
)))
588 return ovl_do_setxattr(ovl_dentry_upper(dentry
),
589 OVL_XATTR_NLINK
, buf
, len
, 0);
592 int ovl_set_nlink_upper(struct dentry
*dentry
)
594 return ovl_set_nlink_common(dentry
, ovl_dentry_upper(dentry
), "U%+i");
597 int ovl_set_nlink_lower(struct dentry
*dentry
)
599 return ovl_set_nlink_common(dentry
, ovl_dentry_lower(dentry
), "L%+i");
602 unsigned int ovl_get_nlink(struct dentry
*lowerdentry
,
603 struct dentry
*upperdentry
,
604 unsigned int fallback
)
611 if (!lowerdentry
|| !upperdentry
|| d_inode(lowerdentry
)->i_nlink
== 1)
614 err
= vfs_getxattr(upperdentry
, OVL_XATTR_NLINK
, &buf
, sizeof(buf
) - 1);
619 if ((buf
[0] != 'L' && buf
[0] != 'U') ||
620 (buf
[1] != '+' && buf
[1] != '-'))
623 err
= kstrtoint(buf
+ 1, 10, &nlink_diff
);
627 nlink
= d_inode(buf
[0] == 'L' ? lowerdentry
: upperdentry
)->i_nlink
;
636 pr_warn_ratelimited("overlayfs: failed to get index nlink (%pd2, err=%i)\n",
641 struct inode
*ovl_new_inode(struct super_block
*sb
, umode_t mode
, dev_t rdev
)
645 inode
= new_inode(sb
);
647 ovl_fill_inode(inode
, mode
, rdev
, 0, 0);
652 static int ovl_inode_test(struct inode
*inode
, void *data
)
654 return inode
->i_private
== data
;
657 static int ovl_inode_set(struct inode
*inode
, void *data
)
659 inode
->i_private
= data
;
663 static bool ovl_verify_inode(struct inode
*inode
, struct dentry
*lowerdentry
,
664 struct dentry
*upperdentry
, bool strict
)
667 * For directories, @strict verify from lookup path performs consistency
668 * checks, so NULL lower/upper in dentry must match NULL lower/upper in
669 * inode. Non @strict verify from NFS handle decode path passes NULL for
670 * 'unknown' lower/upper.
672 if (S_ISDIR(inode
->i_mode
) && strict
) {
673 /* Real lower dir moved to upper layer under us? */
674 if (!lowerdentry
&& ovl_inode_lower(inode
))
677 /* Lookup of an uncovered redirect origin? */
678 if (!upperdentry
&& ovl_inode_upper(inode
))
683 * Allow non-NULL lower inode in ovl_inode even if lowerdentry is NULL.
684 * This happens when finding a copied up overlay inode for a renamed
685 * or hardlinked overlay dentry and lower dentry cannot be followed
686 * by origin because lower fs does not support file handles.
688 if (lowerdentry
&& ovl_inode_lower(inode
) != d_inode(lowerdentry
))
692 * Allow non-NULL __upperdentry in inode even if upperdentry is NULL.
693 * This happens when finding a lower alias for a copied up hard link.
695 if (upperdentry
&& ovl_inode_upper(inode
) != d_inode(upperdentry
))
701 struct inode
*ovl_lookup_inode(struct super_block
*sb
, struct dentry
*real
,
704 struct inode
*inode
, *key
= d_inode(real
);
706 inode
= ilookup5(sb
, (unsigned long) key
, ovl_inode_test
, key
);
710 if (!ovl_verify_inode(inode
, is_upper
? NULL
: real
,
711 is_upper
? real
: NULL
, false)) {
713 return ERR_PTR(-ESTALE
);
720 * Does overlay inode need to be hashed by lower inode?
722 static bool ovl_hash_bylower(struct super_block
*sb
, struct dentry
*upper
,
723 struct dentry
*lower
, struct dentry
*index
)
725 struct ovl_fs
*ofs
= sb
->s_fs_info
;
727 /* No, if pure upper */
731 /* Yes, if already indexed */
735 /* Yes, if won't be copied up */
739 /* No, if lower hardlink is or will be broken on copy up */
740 if ((upper
|| !ovl_indexdir(sb
)) &&
741 !d_is_dir(lower
) && d_inode(lower
)->i_nlink
> 1)
744 /* No, if non-indexed upper with NFS export */
745 if (sb
->s_export_op
&& upper
)
748 /* Otherwise, hash by lower inode for fsnotify */
752 struct inode
*ovl_get_inode(struct super_block
*sb
, struct dentry
*upperdentry
,
753 struct ovl_path
*lowerpath
, struct dentry
*index
,
754 unsigned int numlower
)
756 struct inode
*realinode
= upperdentry
? d_inode(upperdentry
) : NULL
;
758 struct dentry
*lowerdentry
= lowerpath
? lowerpath
->dentry
: NULL
;
759 bool bylower
= ovl_hash_bylower(sb
, upperdentry
, lowerdentry
, index
);
760 int fsid
= bylower
? lowerpath
->layer
->fsid
: 0;
762 unsigned long ino
= 0;
765 realinode
= d_inode(lowerdentry
);
768 * Copy up origin (lower) may exist for non-indexed upper, but we must
769 * not use lower as hash key if this is a broken hardlink.
771 is_dir
= S_ISDIR(realinode
->i_mode
);
772 if (upperdentry
|| bylower
) {
773 struct inode
*key
= d_inode(bylower
? lowerdentry
:
775 unsigned int nlink
= is_dir
? 1 : realinode
->i_nlink
;
777 inode
= iget5_locked(sb
, (unsigned long) key
,
778 ovl_inode_test
, ovl_inode_set
, key
);
781 if (!(inode
->i_state
& I_NEW
)) {
783 * Verify that the underlying files stored in the inode
784 * match those in the dentry.
786 if (!ovl_verify_inode(inode
, lowerdentry
, upperdentry
,
789 inode
= ERR_PTR(-ESTALE
);
797 /* Recalculate nlink for non-dir due to indexing */
799 nlink
= ovl_get_nlink(lowerdentry
, upperdentry
, nlink
);
800 set_nlink(inode
, nlink
);
803 /* Lower hardlink that will be broken on copy up */
804 inode
= new_inode(sb
);
808 ovl_fill_inode(inode
, realinode
->i_mode
, realinode
->i_rdev
, ino
, fsid
);
809 ovl_inode_init(inode
, upperdentry
, lowerdentry
);
811 if (upperdentry
&& ovl_is_impuredir(upperdentry
))
812 ovl_set_flag(OVL_IMPURE
, inode
);
815 ovl_set_flag(OVL_INDEX
, inode
);
817 /* Check for non-merge dir that may have whiteouts */
819 if (((upperdentry
&& lowerdentry
) || numlower
> 1) ||
820 ovl_check_origin_xattr(upperdentry
?: lowerdentry
)) {
821 ovl_set_flag(OVL_WHITEOUTS
, inode
);
825 if (inode
->i_state
& I_NEW
)
826 unlock_new_inode(inode
);
831 inode
= ERR_PTR(-ENOMEM
);