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 static int ovl_set_redirect(struct dentry *dentry, bool samedir);
29 int ovl_cleanup(struct inode *wdir, struct dentry *wdentry)
34 if (d_is_dir(wdentry))
35 err = ovl_do_rmdir(wdir, wdentry);
37 err = ovl_do_unlink(wdir, wdentry);
41 pr_err("overlayfs: cleanup of '%pd2' failed (%i)\n",
48 static struct dentry *ovl_lookup_temp(struct dentry *workdir)
52 static atomic_t temp_id = ATOMIC_INIT(0);
54 /* counter is allowed to wrap, since temp dentries are ephemeral */
55 snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id));
57 temp = lookup_one_len(name, workdir, strlen(name));
58 if (!IS_ERR(temp) && temp->d_inode) {
59 pr_err("overlayfs: workdir/%s already exists\n", name);
67 /* caller holds i_mutex on workdir */
68 static struct dentry *ovl_whiteout(struct dentry *workdir)
71 struct dentry *whiteout;
72 struct inode *wdir = workdir->d_inode;
74 whiteout = ovl_lookup_temp(workdir);
78 err = ovl_do_whiteout(wdir, whiteout);
81 whiteout = ERR_PTR(err);
87 /* Caller must hold i_mutex on both workdir and dir */
88 int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir,
89 struct dentry *dentry)
91 struct inode *wdir = workdir->d_inode;
92 struct dentry *whiteout;
96 whiteout = ovl_whiteout(workdir);
97 err = PTR_ERR(whiteout);
101 if (d_is_dir(dentry))
102 flags = RENAME_EXCHANGE;
104 err = ovl_do_rename(wdir, whiteout, dir, dentry, flags);
108 ovl_cleanup(wdir, dentry);
115 ovl_cleanup(wdir, whiteout);
119 static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry,
123 struct dentry *d, *dentry = *newdentry;
125 err = ovl_do_mkdir(dir, dentry, mode);
129 if (likely(!d_unhashed(dentry)))
133 * vfs_mkdir() may succeed and leave the dentry passed
134 * to it unhashed and negative. If that happens, try to
135 * lookup a new hashed and positive dentry.
137 d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
140 pr_warn("overlayfs: failed lookup after mkdir (%pd2, err=%i).\n",
150 struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry,
151 struct ovl_cattr *attr)
155 if (IS_ERR(newdentry))
159 if (newdentry->d_inode)
162 if (attr->hardlink) {
163 err = ovl_do_link(attr->hardlink, dir, newdentry);
165 switch (attr->mode & S_IFMT) {
167 err = ovl_do_create(dir, newdentry, attr->mode);
171 /* mkdir is special... */
172 err = ovl_mkdir_real(dir, &newdentry, attr->mode);
179 err = ovl_do_mknod(dir, newdentry, attr->mode,
184 err = ovl_do_symlink(dir, newdentry, attr->link);
191 if (!err && WARN_ON(!newdentry->d_inode)) {
193 * Not quite sure if non-instantiated dentry is legal or not.
194 * VFS doesn't seem to care so check and warn here.
206 struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr)
208 return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir),
212 static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
217 err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
219 ovl_dentry_set_opaque(dentry);
224 static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
227 * Fail with -EIO when trying to create opaque dir and upper doesn't
228 * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
229 * return a specific error for noxattr case.
231 return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
235 * Common operations required to be done after creation of file on upper.
236 * If @hardlink is false, then @inode is a pre-allocated inode, we may or
237 * may not use to instantiate the new dentry.
239 static int ovl_instantiate(struct dentry *dentry, struct inode *inode,
240 struct dentry *newdentry, bool hardlink)
242 struct ovl_inode_params oip = {
243 .upperdentry = newdentry,
247 ovl_dir_modified(dentry->d_parent, false);
248 ovl_dentry_set_upper_alias(dentry);
251 * ovl_obtain_alias() can be called after ovl_create_real()
252 * and before we get here, so we may get an inode from cache
253 * with the same real upperdentry that is not the inode we
254 * pre-allocated. In this case we will use the cached inode
255 * to instantiate the new dentry.
257 * XXX: if we ever use ovl_obtain_alias() to decode directory
258 * file handles, need to use ovl_get_inode_locked() and
259 * d_instantiate_new() here to prevent from creating two
260 * hashed directory inode aliases.
262 inode = ovl_get_inode(dentry->d_sb, &oip);
263 if (WARN_ON(IS_ERR(inode)))
264 return PTR_ERR(inode);
266 WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
271 d_instantiate(dentry, inode);
272 if (inode != oip.newinode) {
273 pr_warn_ratelimited("overlayfs: newly created inode found in cache (%pd2)\n",
277 /* Force lookup of new upper hardlink to find its lower */
284 static bool ovl_type_merge(struct dentry *dentry)
286 return OVL_TYPE_MERGE(ovl_path_type(dentry));
289 static bool ovl_type_origin(struct dentry *dentry)
291 return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
294 static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
295 struct ovl_cattr *attr)
297 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
298 struct inode *udir = upperdir->d_inode;
299 struct dentry *newdentry;
302 if (!attr->hardlink && !IS_POSIXACL(udir))
303 attr->mode &= ~current_umask();
305 inode_lock_nested(udir, I_MUTEX_PARENT);
306 newdentry = ovl_create_real(udir,
307 lookup_one_len(dentry->d_name.name,
311 err = PTR_ERR(newdentry);
312 if (IS_ERR(newdentry))
315 if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
316 /* Setting opaque here is just an optimization, allow to fail */
317 ovl_set_opaque(dentry, newdentry);
320 err = ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink);
328 ovl_cleanup(udir, newdentry);
333 static struct dentry *ovl_clear_empty(struct dentry *dentry,
334 struct list_head *list)
336 struct dentry *workdir = ovl_workdir(dentry);
337 struct inode *wdir = workdir->d_inode;
338 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
339 struct inode *udir = upperdir->d_inode;
340 struct path upperpath;
341 struct dentry *upper;
342 struct dentry *opaquedir;
346 if (WARN_ON(!workdir))
347 return ERR_PTR(-EROFS);
349 err = ovl_lock_rename_workdir(workdir, upperdir);
353 ovl_path_upper(dentry, &upperpath);
354 err = vfs_getattr(&upperpath, &stat,
355 STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
360 if (!S_ISDIR(stat.mode))
362 upper = upperpath.dentry;
363 if (upper->d_parent->d_inode != udir)
366 opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode));
367 err = PTR_ERR(opaquedir);
368 if (IS_ERR(opaquedir))
371 err = ovl_copy_xattr(upper, opaquedir);
375 err = ovl_set_opaque(dentry, opaquedir);
379 inode_lock(opaquedir->d_inode);
380 err = ovl_set_attr(opaquedir, &stat);
381 inode_unlock(opaquedir->d_inode);
385 err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
389 ovl_cleanup_whiteouts(upper, list);
390 ovl_cleanup(wdir, upper);
391 unlock_rename(workdir, upperdir);
393 /* dentry's upper doesn't match now, get rid of it */
399 ovl_cleanup(wdir, opaquedir);
402 unlock_rename(workdir, upperdir);
407 static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
408 const struct posix_acl *acl)
414 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
417 size = posix_acl_to_xattr(NULL, acl, NULL, 0);
418 buffer = kmalloc(size, GFP_KERNEL);
422 size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
427 err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
433 static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
434 struct ovl_cattr *cattr)
436 struct dentry *workdir = ovl_workdir(dentry);
437 struct inode *wdir = workdir->d_inode;
438 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
439 struct inode *udir = upperdir->d_inode;
440 struct dentry *upper;
441 struct dentry *newdentry;
443 struct posix_acl *acl, *default_acl;
444 bool hardlink = !!cattr->hardlink;
446 if (WARN_ON(!workdir))
450 err = posix_acl_create(dentry->d_parent->d_inode,
451 &cattr->mode, &default_acl, &acl);
456 err = ovl_lock_rename_workdir(workdir, upperdir);
460 upper = lookup_one_len(dentry->d_name.name, upperdir,
462 err = PTR_ERR(upper);
466 newdentry = ovl_create_temp(workdir, cattr);
467 err = PTR_ERR(newdentry);
468 if (IS_ERR(newdentry))
472 * mode could have been mutilated due to umask (e.g. sgid directory)
475 !S_ISLNK(cattr->mode) &&
476 newdentry->d_inode->i_mode != cattr->mode) {
477 struct iattr attr = {
478 .ia_valid = ATTR_MODE,
479 .ia_mode = cattr->mode,
481 inode_lock(newdentry->d_inode);
482 err = notify_change(newdentry, &attr, NULL);
483 inode_unlock(newdentry->d_inode);
488 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
493 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
499 if (!hardlink && S_ISDIR(cattr->mode)) {
500 err = ovl_set_opaque(dentry, newdentry);
504 err = ovl_do_rename(wdir, newdentry, udir, upper,
509 ovl_cleanup(wdir, upper);
511 err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
515 err = ovl_instantiate(dentry, inode, newdentry, hardlink);
521 unlock_rename(workdir, upperdir);
524 posix_acl_release(acl);
525 posix_acl_release(default_acl);
530 ovl_cleanup(wdir, newdentry);
535 static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
536 struct ovl_cattr *attr, bool origin)
539 const struct cred *old_cred;
540 struct cred *override_cred;
541 struct dentry *parent = dentry->d_parent;
543 err = ovl_copy_up(parent);
547 old_cred = ovl_override_creds(dentry->d_sb);
550 * When linking a file with copy up origin into a new parent, mark the
551 * new parent dir "impure".
554 err = ovl_set_impure(parent, ovl_dentry_upper(parent));
556 goto out_revert_creds;
560 override_cred = prepare_creds();
562 override_cred->fsuid = inode->i_uid;
563 override_cred->fsgid = inode->i_gid;
564 if (!attr->hardlink) {
565 err = security_dentry_create_files_as(dentry,
566 attr->mode, &dentry->d_name, old_cred,
569 put_cred(override_cred);
570 goto out_revert_creds;
573 put_cred(override_creds(override_cred));
574 put_cred(override_cred);
576 if (!ovl_dentry_is_whiteout(dentry))
577 err = ovl_create_upper(dentry, inode, attr);
579 err = ovl_create_over_whiteout(dentry, inode, attr);
582 revert_creds(old_cred);
586 static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
591 struct ovl_cattr attr = {
596 err = ovl_want_write(dentry);
600 /* Preallocate inode to be used by ovl_get_inode() */
602 inode = ovl_new_inode(dentry->d_sb, mode, rdev);
606 spin_lock(&inode->i_lock);
607 inode->i_state |= I_CREATING;
608 spin_unlock(&inode->i_lock);
610 inode_init_owner(inode, dentry->d_parent->d_inode, mode);
611 attr.mode = inode->i_mode;
613 err = ovl_create_or_link(dentry, inode, &attr, false);
614 /* Did we end up using the preallocated inode? */
615 if (inode != d_inode(dentry))
619 ovl_drop_write(dentry);
624 static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
627 return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
630 static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
632 return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
635 static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
638 /* Don't allow creation of "whiteout" on overlay */
639 if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
642 return ovl_create_object(dentry, mode, rdev, NULL);
645 static int ovl_symlink(struct inode *dir, struct dentry *dentry,
648 return ovl_create_object(dentry, S_IFLNK, 0, link);
651 static int ovl_link(struct dentry *old, struct inode *newdir,
658 err = ovl_want_write(old);
662 err = ovl_copy_up(old);
666 if (ovl_is_metacopy_dentry(old)) {
667 err = ovl_set_redirect(old, false);
672 err = ovl_nlink_start(old, &locked);
676 inode = d_inode(old);
679 err = ovl_create_or_link(new, inode,
680 &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)},
681 ovl_type_origin(old));
685 ovl_nlink_end(old, locked);
692 static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)
694 return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);
697 static int ovl_remove_and_whiteout(struct dentry *dentry,
698 struct list_head *list)
700 struct dentry *workdir = ovl_workdir(dentry);
701 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
702 struct dentry *upper;
703 struct dentry *opaquedir = NULL;
706 if (WARN_ON(!workdir))
709 if (!list_empty(list)) {
710 opaquedir = ovl_clear_empty(dentry, list);
711 err = PTR_ERR(opaquedir);
712 if (IS_ERR(opaquedir))
716 err = ovl_lock_rename_workdir(workdir, upperdir);
720 upper = lookup_one_len(dentry->d_name.name, upperdir,
722 err = PTR_ERR(upper);
727 if ((opaquedir && upper != opaquedir) ||
728 (!opaquedir && ovl_dentry_upper(dentry) &&
729 !ovl_matches_upper(dentry, upper))) {
733 err = ovl_cleanup_and_whiteout(workdir, d_inode(upperdir), upper);
737 ovl_dir_modified(dentry->d_parent, true);
743 unlock_rename(workdir, upperdir);
750 static int ovl_remove_upper(struct dentry *dentry, bool is_dir,
751 struct list_head *list)
753 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
754 struct inode *dir = upperdir->d_inode;
755 struct dentry *upper;
756 struct dentry *opaquedir = NULL;
759 if (!list_empty(list)) {
760 opaquedir = ovl_clear_empty(dentry, list);
761 err = PTR_ERR(opaquedir);
762 if (IS_ERR(opaquedir))
766 inode_lock_nested(dir, I_MUTEX_PARENT);
767 upper = lookup_one_len(dentry->d_name.name, upperdir,
769 err = PTR_ERR(upper);
774 if ((opaquedir && upper != opaquedir) ||
775 (!opaquedir && !ovl_matches_upper(dentry, upper)))
779 err = vfs_rmdir(dir, upper);
781 err = vfs_unlink(dir, upper, NULL);
782 ovl_dir_modified(dentry->d_parent, ovl_type_origin(dentry));
785 * Keeping this dentry hashed would mean having to release
786 * upperpath/lowerpath, which could only be done if we are the
787 * sole user of this dentry. Too tricky... Just unhash for
801 static bool ovl_pure_upper(struct dentry *dentry)
803 return !ovl_dentry_lower(dentry) &&
804 !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry));
807 static int ovl_do_remove(struct dentry *dentry, bool is_dir)
811 const struct cred *old_cred;
812 struct dentry *upperdentry;
813 bool lower_positive = ovl_lower_positive(dentry);
816 /* No need to clean pure upper removed by vfs_rmdir() */
817 if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) {
818 err = ovl_check_empty_dir(dentry, &list);
823 err = ovl_want_write(dentry);
827 err = ovl_copy_up(dentry->d_parent);
831 err = ovl_nlink_start(dentry, &locked);
835 old_cred = ovl_override_creds(dentry->d_sb);
837 err = ovl_remove_upper(dentry, is_dir, &list);
839 err = ovl_remove_and_whiteout(dentry, &list);
840 revert_creds(old_cred);
843 clear_nlink(dentry->d_inode);
845 drop_nlink(dentry->d_inode);
847 ovl_nlink_end(dentry, locked);
852 * Note: we fail to update ctime if there was no copy-up, only a
855 upperdentry = ovl_dentry_upper(dentry);
857 ovl_copyattr(d_inode(upperdentry), d_inode(dentry));
860 ovl_drop_write(dentry);
862 ovl_cache_free(&list);
866 static int ovl_unlink(struct inode *dir, struct dentry *dentry)
868 return ovl_do_remove(dentry, false);
871 static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
873 return ovl_do_remove(dentry, true);
876 static bool ovl_type_merge_or_lower(struct dentry *dentry)
878 enum ovl_path_type type = ovl_path_type(dentry);
880 return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
883 static bool ovl_can_move(struct dentry *dentry)
885 return ovl_redirect_dir(dentry->d_sb) ||
886 !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
889 static char *ovl_get_redirect(struct dentry *dentry, bool abs_redirect)
892 struct dentry *d, *tmp;
893 int buflen = ovl_redirect_max + 1;
896 ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
901 buf = ret = kmalloc(buflen, GFP_KERNEL);
907 for (d = dget(dentry); !IS_ROOT(d);) {
911 spin_lock(&d->d_lock);
912 name = ovl_dentry_get_redirect(d);
914 thislen = strlen(name);
916 name = d->d_name.name;
917 thislen = d->d_name.len;
920 /* If path is too long, fall back to userspace move */
921 if (thislen + (name[0] != '/') > buflen) {
922 ret = ERR_PTR(-EXDEV);
923 spin_unlock(&d->d_lock);
928 memcpy(&buf[buflen], name, thislen);
929 tmp = dget_dlock(d->d_parent);
930 spin_unlock(&d->d_lock);
935 /* Absolute redirect: finished */
936 if (buf[buflen] == '/')
941 ret = kstrdup(&buf[buflen], GFP_KERNEL);
946 return ret ? ret : ERR_PTR(-ENOMEM);
949 static bool ovl_need_absolute_redirect(struct dentry *dentry, bool samedir)
951 struct dentry *lowerdentry;
956 if (d_is_dir(dentry))
960 * For non-dir hardlinked files, we need absolute redirects
961 * in general as two upper hardlinks could be in different
962 * dirs. We could put a relative redirect now and convert
963 * it to absolute redirect later. But when nlink > 1 and
964 * indexing is on, that means relative redirect needs to be
965 * converted to absolute during copy up of another lower
968 * So without optimizing too much, just check if lower is
969 * a hard link or not. If lower is hard link, put absolute
972 lowerdentry = ovl_dentry_lower(dentry);
973 return (d_inode(lowerdentry)->i_nlink > 1);
976 static int ovl_set_redirect(struct dentry *dentry, bool samedir)
979 const char *redirect = ovl_dentry_get_redirect(dentry);
980 bool absolute_redirect = ovl_need_absolute_redirect(dentry, samedir);
982 if (redirect && (!absolute_redirect || redirect[0] == '/'))
985 redirect = ovl_get_redirect(dentry, absolute_redirect);
986 if (IS_ERR(redirect))
987 return PTR_ERR(redirect);
989 err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
991 redirect, strlen(redirect), -EXDEV);
993 spin_lock(&dentry->d_lock);
994 ovl_dentry_set_redirect(dentry, redirect);
995 spin_unlock(&dentry->d_lock);
998 pr_warn_ratelimited("overlayfs: failed to set redirect (%i)\n",
1000 /* Fall back to userspace copy-up */
1006 static int ovl_rename(struct inode *olddir, struct dentry *old,
1007 struct inode *newdir, struct dentry *new,
1011 bool locked = false;
1012 struct dentry *old_upperdir;
1013 struct dentry *new_upperdir;
1014 struct dentry *olddentry;
1015 struct dentry *newdentry;
1016 struct dentry *trap;
1019 bool cleanup_whiteout = false;
1020 bool overwrite = !(flags & RENAME_EXCHANGE);
1021 bool is_dir = d_is_dir(old);
1022 bool new_is_dir = d_is_dir(new);
1023 bool samedir = olddir == newdir;
1024 struct dentry *opaquedir = NULL;
1025 const struct cred *old_cred = NULL;
1029 if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
1032 flags &= ~RENAME_NOREPLACE;
1034 /* Don't copy up directory trees */
1036 if (!ovl_can_move(old))
1038 if (!overwrite && !ovl_can_move(new))
1041 if (overwrite && new_is_dir && !ovl_pure_upper(new)) {
1042 err = ovl_check_empty_dir(new, &list);
1048 if (ovl_lower_positive(old)) {
1049 if (!ovl_dentry_is_whiteout(new)) {
1050 /* Whiteout source */
1051 flags |= RENAME_WHITEOUT;
1053 /* Switch whiteouts */
1054 flags |= RENAME_EXCHANGE;
1056 } else if (is_dir && ovl_dentry_is_whiteout(new)) {
1057 flags |= RENAME_EXCHANGE;
1058 cleanup_whiteout = true;
1062 err = ovl_want_write(old);
1066 err = ovl_copy_up(old);
1068 goto out_drop_write;
1070 err = ovl_copy_up(new->d_parent);
1072 goto out_drop_write;
1074 err = ovl_copy_up(new);
1076 goto out_drop_write;
1078 err = ovl_nlink_start(new, &locked);
1080 goto out_drop_write;
1083 old_cred = ovl_override_creds(old->d_sb);
1085 if (!list_empty(&list)) {
1086 opaquedir = ovl_clear_empty(new, &list);
1087 err = PTR_ERR(opaquedir);
1088 if (IS_ERR(opaquedir)) {
1090 goto out_revert_creds;
1094 old_upperdir = ovl_dentry_upper(old->d_parent);
1095 new_upperdir = ovl_dentry_upper(new->d_parent);
1099 * When moving a merge dir or non-dir with copy up origin into
1100 * a new parent, we are marking the new parent dir "impure".
1101 * When ovl_iterate() iterates an "impure" upper dir, it will
1102 * lookup the origin inodes of the entries to fill d_ino.
1104 if (ovl_type_origin(old)) {
1105 err = ovl_set_impure(new->d_parent, new_upperdir);
1107 goto out_revert_creds;
1109 if (!overwrite && ovl_type_origin(new)) {
1110 err = ovl_set_impure(old->d_parent, old_upperdir);
1112 goto out_revert_creds;
1116 trap = lock_rename(new_upperdir, old_upperdir);
1118 olddentry = lookup_one_len(old->d_name.name, old_upperdir,
1120 err = PTR_ERR(olddentry);
1121 if (IS_ERR(olddentry))
1125 if (!ovl_matches_upper(old, olddentry))
1128 newdentry = lookup_one_len(new->d_name.name, new_upperdir,
1130 err = PTR_ERR(newdentry);
1131 if (IS_ERR(newdentry))
1134 old_opaque = ovl_dentry_is_opaque(old);
1135 new_opaque = ovl_dentry_is_opaque(new);
1138 if (d_inode(new) && ovl_dentry_upper(new)) {
1140 if (newdentry != opaquedir)
1143 if (!ovl_matches_upper(new, newdentry))
1147 if (!d_is_negative(newdentry) &&
1148 (!new_opaque || !ovl_is_whiteout(newdentry)))
1152 if (olddentry == trap)
1154 if (newdentry == trap)
1157 if (WARN_ON(olddentry->d_inode == newdentry->d_inode))
1161 if (ovl_type_merge_or_lower(old))
1162 err = ovl_set_redirect(old, samedir);
1163 else if (is_dir && !old_opaque && ovl_type_merge(new->d_parent))
1164 err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
1168 if (!overwrite && ovl_type_merge_or_lower(new))
1169 err = ovl_set_redirect(new, samedir);
1170 else if (!overwrite && new_is_dir && !new_opaque &&
1171 ovl_type_merge(old->d_parent))
1172 err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
1176 err = ovl_do_rename(old_upperdir->d_inode, olddentry,
1177 new_upperdir->d_inode, newdentry, flags);
1181 if (cleanup_whiteout)
1182 ovl_cleanup(old_upperdir->d_inode, newdentry);
1184 if (overwrite && d_inode(new)) {
1186 clear_nlink(d_inode(new));
1188 drop_nlink(d_inode(new));
1191 ovl_dir_modified(old->d_parent, ovl_type_origin(old) ||
1192 (!overwrite && ovl_type_origin(new)));
1193 ovl_dir_modified(new->d_parent, ovl_type_origin(old) ||
1194 (d_inode(new) && ovl_type_origin(new)));
1197 ovl_copyattr(d_inode(olddentry), d_inode(old));
1198 if (d_inode(new) && ovl_dentry_upper(new))
1199 ovl_copyattr(d_inode(newdentry), d_inode(new));
1206 unlock_rename(new_upperdir, old_upperdir);
1208 revert_creds(old_cred);
1209 ovl_nlink_end(new, locked);
1211 ovl_drop_write(old);
1214 ovl_cache_free(&list);
1218 const struct inode_operations ovl_dir_inode_operations = {
1219 .lookup = ovl_lookup,
1221 .symlink = ovl_symlink,
1222 .unlink = ovl_unlink,
1224 .rename = ovl_rename,
1226 .setattr = ovl_setattr,
1227 .create = ovl_create,
1229 .permission = ovl_permission,
1230 .getattr = ovl_getattr,
1231 .listxattr = ovl_listxattr,
1232 .get_acl = ovl_get_acl,
1233 .update_time = ovl_update_time,