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;
25 err = setattr_prepare(dentry, attr);
29 err = ovl_want_write(dentry);
33 if (attr->ia_valid & ATTR_SIZE) {
34 struct inode *realinode = d_inode(ovl_dentry_real(dentry));
37 if (atomic_read(&realinode->i_writecount) < 0)
41 err = ovl_copy_up(dentry);
43 struct inode *winode = NULL;
45 upperdentry = ovl_dentry_upper(dentry);
47 if (attr->ia_valid & ATTR_SIZE) {
48 winode = d_inode(upperdentry);
49 err = get_write_access(winode);
54 if (attr->ia_valid & (ATTR_KILL_SUID|ATTR_KILL_SGID))
55 attr->ia_valid &= ~ATTR_MODE;
57 inode_lock(upperdentry->d_inode);
58 old_cred = ovl_override_creds(dentry->d_sb);
59 err = notify_change(upperdentry, attr, NULL);
60 revert_creds(old_cred);
62 ovl_copyattr(upperdentry->d_inode, dentry->d_inode);
63 inode_unlock(upperdentry->d_inode);
66 put_write_access(winode);
69 ovl_drop_write(dentry);
74 static int ovl_map_dev_ino(struct dentry *dentry, struct kstat *stat,
75 struct ovl_layer *lower_layer)
77 bool samefs = ovl_same_sb(dentry->d_sb);
78 unsigned int xinobits = ovl_xino_bits(dentry->d_sb);
82 * When all layers are on the same fs, all real inode
83 * number are unique, so we use the overlay st_dev,
84 * which is friendly to du -x.
86 stat->dev = dentry->d_sb->s_dev;
88 } else if (xinobits) {
89 unsigned int shift = 64 - xinobits;
91 * All inode numbers of underlying fs should not be using the
92 * high xinobits, so we use high xinobits to partition the
93 * overlay st_ino address space. The high bits holds the fsid
94 * (upper fsid is 0). This way overlay inode numbers are unique
95 * and all inodes use overlay st_dev. Inode numbers are also
96 * persistent for a given layer configuration.
98 if (stat->ino >> shift) {
99 pr_warn_ratelimited("overlayfs: inode number too big (%pd2, ino=%llu, xinobits=%d)\n",
100 dentry, stat->ino, xinobits);
103 stat->ino |= ((u64)lower_layer->fsid) << shift;
105 stat->dev = dentry->d_sb->s_dev;
110 /* The inode could not be mapped to a unified st_ino address space */
111 if (S_ISDIR(dentry->d_inode->i_mode)) {
113 * Always use the overlay st_dev for directories, so 'find
114 * -xdev' will scan the entire overlay mount and won't cross the
115 * overlay mount boundaries.
117 * If not all layers are on the same fs the pair {real st_ino;
118 * overlay st_dev} is not unique, so use the non persistent
119 * overlay st_ino for directories.
121 stat->dev = dentry->d_sb->s_dev;
122 stat->ino = dentry->d_inode->i_ino;
123 } else if (lower_layer && lower_layer->fsid) {
125 * For non-samefs setup, if we cannot map all layers st_ino
126 * to a unified address space, we need to make sure that st_dev
127 * is unique per lower fs. Upper layer uses real st_dev and
128 * lower layers use the unique anonymous bdev assigned to the
131 stat->dev = lower_layer->fs->pseudo_dev;
137 int ovl_getattr(const struct path *path, struct kstat *stat,
138 u32 request_mask, unsigned int flags)
140 struct dentry *dentry = path->dentry;
141 enum ovl_path_type type;
142 struct path realpath;
143 const struct cred *old_cred;
144 bool is_dir = S_ISDIR(dentry->d_inode->i_mode);
145 bool samefs = ovl_same_sb(dentry->d_sb);
146 struct ovl_layer *lower_layer = NULL;
148 bool metacopy_blocks = false;
150 metacopy_blocks = ovl_is_metacopy_dentry(dentry);
152 type = ovl_path_real(dentry, &realpath);
153 old_cred = ovl_override_creds(dentry->d_sb);
154 err = vfs_getattr(&realpath, stat, request_mask, flags);
159 * For non-dir or same fs, we use st_ino of the copy up origin.
160 * This guaranties constant st_dev/st_ino across copy up.
161 * With xino feature and non-samefs, we use st_ino of the copy up
162 * origin masked with high bits that represent the layer id.
164 * If lower filesystem supports NFS file handles, this also guaranties
165 * persistent st_ino across mount cycle.
167 if (!is_dir || samefs || ovl_xino_bits(dentry->d_sb)) {
168 if (!OVL_TYPE_UPPER(type)) {
169 lower_layer = ovl_layer_lower(dentry);
170 } else if (OVL_TYPE_ORIGIN(type)) {
171 struct kstat lowerstat;
172 u32 lowermask = STATX_INO | STATX_BLOCKS |
173 (!is_dir ? STATX_NLINK : 0);
175 ovl_path_lower(dentry, &realpath);
176 err = vfs_getattr(&realpath, &lowerstat,
182 * Lower hardlinks may be broken on copy up to different
183 * upper files, so we cannot use the lower origin st_ino
184 * for those different files, even for the same fs case.
186 * Similarly, several redirected dirs can point to the
187 * same dir on a lower layer. With the "verify_lower"
188 * feature, we do not use the lower origin st_ino, if
189 * we haven't verified that this redirect is unique.
191 * With inodes index enabled, it is safe to use st_ino
192 * of an indexed origin. The index validates that the
193 * upper hardlink is not broken and that a redirected
194 * dir is the only redirect to that origin.
196 if (ovl_test_flag(OVL_INDEX, d_inode(dentry)) ||
197 (!ovl_verify_lower(dentry->d_sb) &&
198 (is_dir || lowerstat.nlink == 1))) {
199 stat->ino = lowerstat.ino;
200 lower_layer = ovl_layer_lower(dentry);
204 * If we are querying a metacopy dentry and lower
205 * dentry is data dentry, then use the blocks we
206 * queried just now. We don't have to do additional
207 * vfs_getattr(). If lower itself is metacopy, then
208 * additional vfs_getattr() is unavoidable.
210 if (metacopy_blocks &&
211 realpath.dentry == ovl_dentry_lowerdata(dentry)) {
212 stat->blocks = lowerstat.blocks;
213 metacopy_blocks = false;
217 if (metacopy_blocks) {
219 * If lower is not same as lowerdata or if there was
220 * no origin on upper, we can end up here.
222 struct kstat lowerdatastat;
223 u32 lowermask = STATX_BLOCKS;
225 ovl_path_lowerdata(dentry, &realpath);
226 err = vfs_getattr(&realpath, &lowerdatastat,
230 stat->blocks = lowerdatastat.blocks;
234 err = ovl_map_dev_ino(dentry, stat, lower_layer);
239 * It's probably not worth it to count subdirs to get the
240 * correct link count. nlink=1 seems to pacify 'find' and
243 if (is_dir && OVL_TYPE_MERGE(type))
247 * Return the overlay inode nlinks for indexed upper inodes.
248 * Overlay inode nlink counts the union of the upper hardlinks
249 * and non-covered lower hardlinks. It does not include the upper
252 if (!is_dir && ovl_test_flag(OVL_INDEX, d_inode(dentry)))
253 stat->nlink = dentry->d_inode->i_nlink;
256 revert_creds(old_cred);
261 int ovl_permission(struct inode *inode, int mask)
263 struct inode *upperinode = ovl_inode_upper(inode);
264 struct inode *realinode = upperinode ?: ovl_inode_lower(inode);
265 const struct cred *old_cred;
268 /* Careful in RCU walk mode */
270 WARN_ON(!(mask & MAY_NOT_BLOCK));
275 * Check overlay inode with the creds of task and underlying inode
276 * with creds of mounter
278 err = generic_permission(inode, mask);
282 old_cred = ovl_override_creds(inode->i_sb);
284 !special_file(realinode->i_mode) && mask & MAY_WRITE) {
285 mask &= ~(MAY_WRITE | MAY_APPEND);
286 /* Make sure mounter can read file for copy up later */
289 err = inode_permission(realinode, mask);
290 revert_creds(old_cred);
295 static const char *ovl_get_link(struct dentry *dentry,
297 struct delayed_call *done)
299 const struct cred *old_cred;
303 return ERR_PTR(-ECHILD);
305 old_cred = ovl_override_creds(dentry->d_sb);
306 p = vfs_get_link(ovl_dentry_real(dentry), done);
307 revert_creds(old_cred);
311 bool ovl_is_private_xattr(const char *name)
313 return strncmp(name, OVL_XATTR_PREFIX,
314 sizeof(OVL_XATTR_PREFIX) - 1) == 0;
317 int ovl_xattr_set(struct dentry *dentry, struct inode *inode, const char *name,
318 const void *value, size_t size, int flags)
321 struct dentry *upperdentry = ovl_i_dentry_upper(inode);
322 struct dentry *realdentry = upperdentry ?: ovl_dentry_lower(dentry);
323 const struct cred *old_cred;
325 err = ovl_want_write(dentry);
329 if (!value && !upperdentry) {
330 err = vfs_getxattr(realdentry, name, NULL, 0);
336 err = ovl_copy_up(dentry);
340 realdentry = ovl_dentry_upper(dentry);
343 old_cred = ovl_override_creds(dentry->d_sb);
345 err = vfs_setxattr(realdentry, name, value, size, flags);
347 WARN_ON(flags != XATTR_REPLACE);
348 err = vfs_removexattr(realdentry, name);
350 revert_creds(old_cred);
353 ovl_copyattr(d_inode(realdentry), inode);
356 ovl_drop_write(dentry);
361 int ovl_xattr_get(struct dentry *dentry, struct inode *inode, const char *name,
362 void *value, size_t size)
365 const struct cred *old_cred;
366 struct dentry *realdentry =
367 ovl_i_dentry_upper(inode) ?: ovl_dentry_lower(dentry);
369 old_cred = ovl_override_creds(dentry->d_sb);
370 res = vfs_getxattr(realdentry, name, value, size);
371 revert_creds(old_cred);
375 static bool ovl_can_list(const char *s)
377 /* List all non-trusted xatts */
378 if (strncmp(s, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) != 0)
381 /* Never list trusted.overlay, list other trusted for superuser only */
382 return !ovl_is_private_xattr(s) && capable(CAP_SYS_ADMIN);
385 ssize_t ovl_listxattr(struct dentry *dentry, char *list, size_t size)
387 struct dentry *realdentry = ovl_dentry_real(dentry);
391 const struct cred *old_cred;
393 old_cred = ovl_override_creds(dentry->d_sb);
394 res = vfs_listxattr(realdentry, list, size);
395 revert_creds(old_cred);
396 if (res <= 0 || size == 0)
399 /* filter out private xattrs */
400 for (s = list, len = res; len;) {
401 size_t slen = strnlen(s, len) + 1;
403 /* underlying fs providing us with an broken xattr list? */
404 if (WARN_ON(slen > len))
408 if (!ovl_can_list(s)) {
410 memmove(s, s + slen, len);
419 struct posix_acl *ovl_get_acl(struct inode *inode, int type)
421 struct inode *realinode = ovl_inode_real(inode);
422 const struct cred *old_cred;
423 struct posix_acl *acl;
425 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !IS_POSIXACL(realinode))
428 old_cred = ovl_override_creds(inode->i_sb);
429 acl = get_acl(realinode, type);
430 revert_creds(old_cred);
435 int ovl_update_time(struct inode *inode, struct timespec64 *ts, int flags)
437 if (flags & S_ATIME) {
438 struct ovl_fs *ofs = inode->i_sb->s_fs_info;
439 struct path upperpath = {
440 .mnt = ofs->upper_mnt,
441 .dentry = ovl_upperdentry_dereference(OVL_I(inode)),
444 if (upperpath.dentry) {
445 touch_atime(&upperpath);
446 inode->i_atime = d_inode(upperpath.dentry)->i_atime;
452 static int ovl_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
456 struct inode *realinode = ovl_inode_real(inode);
457 const struct cred *old_cred;
459 if (!realinode->i_op->fiemap)
462 old_cred = ovl_override_creds(inode->i_sb);
463 err = realinode->i_op->fiemap(realinode, fieinfo, start, len);
464 revert_creds(old_cred);
469 static const struct inode_operations ovl_file_inode_operations = {
470 .setattr = ovl_setattr,
471 .permission = ovl_permission,
472 .getattr = ovl_getattr,
473 .listxattr = ovl_listxattr,
474 .get_acl = ovl_get_acl,
475 .update_time = ovl_update_time,
476 .fiemap = ovl_fiemap,
479 static const struct inode_operations ovl_symlink_inode_operations = {
480 .setattr = ovl_setattr,
481 .get_link = ovl_get_link,
482 .getattr = ovl_getattr,
483 .listxattr = ovl_listxattr,
484 .update_time = ovl_update_time,
487 static const struct inode_operations ovl_special_inode_operations = {
488 .setattr = ovl_setattr,
489 .permission = ovl_permission,
490 .getattr = ovl_getattr,
491 .listxattr = ovl_listxattr,
492 .get_acl = ovl_get_acl,
493 .update_time = ovl_update_time,
497 * It is possible to stack overlayfs instance on top of another
498 * overlayfs instance as lower layer. We need to annonate the
499 * stackable i_mutex locks according to stack level of the super
500 * block instance. An overlayfs instance can never be in stack
501 * depth 0 (there is always a real fs below it). An overlayfs
502 * inode lock will use the lockdep annotaion ovl_i_mutex_key[depth].
504 * For example, here is a snip from /proc/lockdep_chains after
505 * dir_iterate of nested overlayfs:
507 * [...] &ovl_i_mutex_dir_key[depth] (stack_depth=2)
508 * [...] &ovl_i_mutex_dir_key[depth]#2 (stack_depth=1)
509 * [...] &type->i_mutex_dir_key (stack_depth=0)
511 #define OVL_MAX_NESTING FILESYSTEM_MAX_STACK_DEPTH
513 static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode)
515 #ifdef CONFIG_LOCKDEP
516 static struct lock_class_key ovl_i_mutex_key[OVL_MAX_NESTING];
517 static struct lock_class_key ovl_i_mutex_dir_key[OVL_MAX_NESTING];
518 static struct lock_class_key ovl_i_lock_key[OVL_MAX_NESTING];
520 int depth = inode->i_sb->s_stack_depth - 1;
522 if (WARN_ON_ONCE(depth < 0 || depth >= OVL_MAX_NESTING))
525 if (S_ISDIR(inode->i_mode))
526 lockdep_set_class(&inode->i_rwsem, &ovl_i_mutex_dir_key[depth]);
528 lockdep_set_class(&inode->i_rwsem, &ovl_i_mutex_key[depth]);
530 lockdep_set_class(&OVL_I(inode)->lock, &ovl_i_lock_key[depth]);
534 static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev,
535 unsigned long ino, int fsid)
537 int xinobits = ovl_xino_bits(inode->i_sb);
540 * When NFS export is enabled and d_ino is consistent with st_ino
541 * (samefs or i_ino has enough bits to encode layer), set the same
542 * value used for d_ino to i_ino, because nfsd readdirplus compares
543 * d_ino values to i_ino values of child entries. When called from
544 * ovl_new_inode(), ino arg is 0, so i_ino will be updated to real
545 * upper inode i_ino on ovl_inode_init() or ovl_inode_update().
547 if (inode->i_sb->s_export_op &&
548 (ovl_same_sb(inode->i_sb) || xinobits)) {
550 if (xinobits && fsid && !(ino >> (64 - xinobits)))
551 inode->i_ino |= (unsigned long)fsid << (64 - xinobits);
553 inode->i_ino = get_next_ino();
555 inode->i_mode = mode;
556 inode->i_flags |= S_NOCMTIME;
557 #ifdef CONFIG_FS_POSIX_ACL
558 inode->i_acl = inode->i_default_acl = ACL_DONT_CACHE;
561 ovl_lockdep_annotate_inode_mutex_key(inode);
563 switch (mode & S_IFMT) {
565 inode->i_op = &ovl_file_inode_operations;
566 inode->i_fop = &ovl_file_operations;
570 inode->i_op = &ovl_dir_inode_operations;
571 inode->i_fop = &ovl_dir_operations;
575 inode->i_op = &ovl_symlink_inode_operations;
579 inode->i_op = &ovl_special_inode_operations;
580 init_special_inode(inode, mode, rdev);
586 * With inodes index enabled, an overlay inode nlink counts the union of upper
587 * hardlinks and non-covered lower hardlinks. During the lifetime of a non-pure
588 * upper inode, the following nlink modifying operations can happen:
590 * 1. Lower hardlink copy up
591 * 2. Upper hardlink created, unlinked or renamed over
592 * 3. Lower hardlink whiteout or renamed over
594 * For the first, copy up case, the union nlink does not change, whether the
595 * operation succeeds or fails, but the upper inode nlink may change.
596 * Therefore, before copy up, we store the union nlink value relative to the
597 * lower inode nlink in the index inode xattr trusted.overlay.nlink.
599 * For the second, upper hardlink case, the union nlink should be incremented
600 * or decremented IFF the operation succeeds, aligned with nlink change of the
601 * upper inode. Therefore, before link/unlink/rename, we store the union nlink
602 * value relative to the upper inode nlink in the index inode.
604 * For the last, lower cover up case, we simplify things by preceding the
605 * whiteout or cover up with copy up. This makes sure that there is an index
606 * upper inode where the nlink xattr can be stored before the copied up upper
609 #define OVL_NLINK_ADD_UPPER (1 << 0)
612 * On-disk format for indexed nlink:
614 * nlink relative to the upper inode - "U[+-]NUM"
615 * nlink relative to the lower inode - "L[+-]NUM"
618 static int ovl_set_nlink_common(struct dentry *dentry,
619 struct dentry *realdentry, const char *format)
621 struct inode *inode = d_inode(dentry);
622 struct inode *realinode = d_inode(realdentry);
626 len = snprintf(buf, sizeof(buf), format,
627 (int) (inode->i_nlink - realinode->i_nlink));
629 if (WARN_ON(len >= sizeof(buf)))
632 return ovl_do_setxattr(ovl_dentry_upper(dentry),
633 OVL_XATTR_NLINK, buf, len, 0);
636 int ovl_set_nlink_upper(struct dentry *dentry)
638 return ovl_set_nlink_common(dentry, ovl_dentry_upper(dentry), "U%+i");
641 int ovl_set_nlink_lower(struct dentry *dentry)
643 return ovl_set_nlink_common(dentry, ovl_dentry_lower(dentry), "L%+i");
646 unsigned int ovl_get_nlink(struct dentry *lowerdentry,
647 struct dentry *upperdentry,
648 unsigned int fallback)
655 if (!lowerdentry || !upperdentry || d_inode(lowerdentry)->i_nlink == 1)
658 err = vfs_getxattr(upperdentry, OVL_XATTR_NLINK, &buf, sizeof(buf) - 1);
663 if ((buf[0] != 'L' && buf[0] != 'U') ||
664 (buf[1] != '+' && buf[1] != '-'))
667 err = kstrtoint(buf + 1, 10, &nlink_diff);
671 nlink = d_inode(buf[0] == 'L' ? lowerdentry : upperdentry)->i_nlink;
680 pr_warn_ratelimited("overlayfs: failed to get index nlink (%pd2, err=%i)\n",
685 struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev)
689 inode = new_inode(sb);
691 ovl_fill_inode(inode, mode, rdev, 0, 0);
696 static int ovl_inode_test(struct inode *inode, void *data)
698 return inode->i_private == data;
701 static int ovl_inode_set(struct inode *inode, void *data)
703 inode->i_private = data;
707 static bool ovl_verify_inode(struct inode *inode, struct dentry *lowerdentry,
708 struct dentry *upperdentry, bool strict)
711 * For directories, @strict verify from lookup path performs consistency
712 * checks, so NULL lower/upper in dentry must match NULL lower/upper in
713 * inode. Non @strict verify from NFS handle decode path passes NULL for
714 * 'unknown' lower/upper.
716 if (S_ISDIR(inode->i_mode) && strict) {
717 /* Real lower dir moved to upper layer under us? */
718 if (!lowerdentry && ovl_inode_lower(inode))
721 /* Lookup of an uncovered redirect origin? */
722 if (!upperdentry && ovl_inode_upper(inode))
727 * Allow non-NULL lower inode in ovl_inode even if lowerdentry is NULL.
728 * This happens when finding a copied up overlay inode for a renamed
729 * or hardlinked overlay dentry and lower dentry cannot be followed
730 * by origin because lower fs does not support file handles.
732 if (lowerdentry && ovl_inode_lower(inode) != d_inode(lowerdentry))
736 * Allow non-NULL __upperdentry in inode even if upperdentry is NULL.
737 * This happens when finding a lower alias for a copied up hard link.
739 if (upperdentry && ovl_inode_upper(inode) != d_inode(upperdentry))
745 struct inode *ovl_lookup_inode(struct super_block *sb, struct dentry *real,
748 struct inode *inode, *key = d_inode(real);
750 inode = ilookup5(sb, (unsigned long) key, ovl_inode_test, key);
754 if (!ovl_verify_inode(inode, is_upper ? NULL : real,
755 is_upper ? real : NULL, false)) {
757 return ERR_PTR(-ESTALE);
764 * Does overlay inode need to be hashed by lower inode?
766 static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper,
767 struct dentry *lower, struct dentry *index)
769 struct ovl_fs *ofs = sb->s_fs_info;
771 /* No, if pure upper */
775 /* Yes, if already indexed */
779 /* Yes, if won't be copied up */
783 /* No, if lower hardlink is or will be broken on copy up */
784 if ((upper || !ovl_indexdir(sb)) &&
785 !d_is_dir(lower) && d_inode(lower)->i_nlink > 1)
788 /* No, if non-indexed upper with NFS export */
789 if (sb->s_export_op && upper)
792 /* Otherwise, hash by lower inode for fsnotify */
796 static struct inode *ovl_iget5(struct super_block *sb, struct inode *newinode,
799 return newinode ? inode_insert5(newinode, (unsigned long) key,
800 ovl_inode_test, ovl_inode_set, key) :
801 iget5_locked(sb, (unsigned long) key,
802 ovl_inode_test, ovl_inode_set, key);
805 struct inode *ovl_get_inode(struct super_block *sb,
806 struct ovl_inode_params *oip)
808 struct dentry *upperdentry = oip->upperdentry;
809 struct ovl_path *lowerpath = oip->lowerpath;
810 struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL;
812 struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL;
813 bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry,
815 int fsid = bylower ? oip->lowerpath->layer->fsid : 0;
816 bool is_dir, metacopy = false;
817 unsigned long ino = 0;
821 realinode = d_inode(lowerdentry);
824 * Copy up origin (lower) may exist for non-indexed upper, but we must
825 * not use lower as hash key if this is a broken hardlink.
827 is_dir = S_ISDIR(realinode->i_mode);
828 if (upperdentry || bylower) {
829 struct inode *key = d_inode(bylower ? lowerdentry :
831 unsigned int nlink = is_dir ? 1 : realinode->i_nlink;
833 inode = ovl_iget5(sb, oip->newinode, key);
836 if (!(inode->i_state & I_NEW)) {
838 * Verify that the underlying files stored in the inode
839 * match those in the dentry.
841 if (!ovl_verify_inode(inode, lowerdentry, upperdentry,
849 kfree(oip->redirect);
853 /* Recalculate nlink for non-dir due to indexing */
855 nlink = ovl_get_nlink(lowerdentry, upperdentry, nlink);
856 set_nlink(inode, nlink);
859 /* Lower hardlink that will be broken on copy up */
860 inode = new_inode(sb);
866 ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid);
867 ovl_inode_init(inode, upperdentry, lowerdentry, oip->lowerdata);
869 if (upperdentry && ovl_is_impuredir(upperdentry))
870 ovl_set_flag(OVL_IMPURE, inode);
873 ovl_set_flag(OVL_INDEX, inode);
876 err = ovl_check_metacopy_xattr(upperdentry);
881 ovl_set_flag(OVL_UPPERDATA, inode);
884 OVL_I(inode)->redirect = oip->redirect;
887 ovl_set_flag(OVL_CONST_INO, inode);
889 /* Check for non-merge dir that may have whiteouts */
891 if (((upperdentry && lowerdentry) || oip->numlower > 1) ||
892 ovl_check_origin_xattr(upperdentry ?: lowerdentry)) {
893 ovl_set_flag(OVL_WHITEOUTS, inode);
897 if (inode->i_state & I_NEW)
898 unlock_new_inode(inode);
903 inode = ERR_PTR(err);