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 int 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",
46 static struct dentry *ovl_lookup_temp(struct dentry *workdir)
50 static atomic_t temp_id = ATOMIC_INIT(0);
52 /* counter is allowed to wrap, since temp dentries are ephemeral */
53 snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id));
55 temp = lookup_one_len(name, workdir, strlen(name));
56 if (!IS_ERR(temp) && temp->d_inode) {
57 pr_err("overlayfs: workdir/%s already exists\n", name);
65 /* caller holds i_mutex on workdir */
66 static struct dentry *ovl_whiteout(struct dentry *workdir)
69 struct dentry *whiteout;
70 struct inode *wdir = workdir->d_inode;
72 whiteout = ovl_lookup_temp(workdir);
76 err = ovl_do_whiteout(wdir, whiteout);
79 whiteout = ERR_PTR(err);
85 /* Caller must hold i_mutex on both workdir and dir */
86 int ovl_cleanup_and_whiteout(struct dentry *workdir, struct inode *dir,
87 struct dentry *dentry)
89 struct inode *wdir = workdir->d_inode;
90 struct dentry *whiteout;
94 whiteout = ovl_whiteout(workdir);
95 err = PTR_ERR(whiteout);
100 flags = RENAME_EXCHANGE;
102 err = ovl_do_rename(wdir, whiteout, dir, dentry, flags);
106 ovl_cleanup(wdir, dentry);
113 ovl_cleanup(wdir, whiteout);
117 static int ovl_mkdir_real(struct inode *dir, struct dentry **newdentry,
121 struct dentry *d, *dentry = *newdentry;
123 err = ovl_do_mkdir(dir, dentry, mode);
127 if (likely(!d_unhashed(dentry)))
131 * vfs_mkdir() may succeed and leave the dentry passed
132 * to it unhashed and negative. If that happens, try to
133 * lookup a new hashed and positive dentry.
135 d = lookup_one_len(dentry->d_name.name, dentry->d_parent,
138 pr_warn("overlayfs: failed lookup after mkdir (%pd2, err=%i).\n",
148 struct dentry *ovl_create_real(struct inode *dir, struct dentry *newdentry,
149 struct ovl_cattr *attr)
153 if (IS_ERR(newdentry))
157 if (newdentry->d_inode)
160 if (attr->hardlink) {
161 err = ovl_do_link(attr->hardlink, dir, newdentry);
163 switch (attr->mode & S_IFMT) {
165 err = ovl_do_create(dir, newdentry, attr->mode);
169 /* mkdir is special... */
170 err = ovl_mkdir_real(dir, &newdentry, attr->mode);
177 err = ovl_do_mknod(dir, newdentry, attr->mode,
182 err = ovl_do_symlink(dir, newdentry, attr->link);
189 if (!err && WARN_ON(!newdentry->d_inode)) {
191 * Not quite sure if non-instantiated dentry is legal or not.
192 * VFS doesn't seem to care so check and warn here.
204 struct dentry *ovl_create_temp(struct dentry *workdir, struct ovl_cattr *attr)
206 return ovl_create_real(d_inode(workdir), ovl_lookup_temp(workdir),
210 static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
215 err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
217 ovl_dentry_set_opaque(dentry);
222 static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
225 * Fail with -EIO when trying to create opaque dir and upper doesn't
226 * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
227 * return a specific error for noxattr case.
229 return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
233 * Common operations required to be done after creation of file on upper.
234 * If @hardlink is false, then @inode is a pre-allocated inode, we may or
235 * may not use to instantiate the new dentry.
237 static int ovl_instantiate(struct dentry *dentry, struct inode *inode,
238 struct dentry *newdentry, bool hardlink)
240 struct ovl_inode_params oip = {
241 .upperdentry = newdentry,
245 ovl_dentry_version_inc(dentry->d_parent, false);
246 ovl_dentry_set_upper_alias(dentry);
249 * ovl_obtain_alias() can be called after ovl_create_real()
250 * and before we get here, so we may get an inode from cache
251 * with the same real upperdentry that is not the inode we
252 * pre-allocated. In this case we will use the cached inode
253 * to instantiate the new dentry.
255 * XXX: if we ever use ovl_obtain_alias() to decode directory
256 * file handles, need to use ovl_get_inode_locked() and
257 * d_instantiate_new() here to prevent from creating two
258 * hashed directory inode aliases.
260 inode = ovl_get_inode(dentry->d_sb, &oip);
261 if (WARN_ON(IS_ERR(inode)))
262 return PTR_ERR(inode);
264 WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
269 d_instantiate(dentry, inode);
270 if (inode != oip.newinode) {
271 pr_warn_ratelimited("overlayfs: newly created inode found in cache (%pd2)\n",
275 /* Force lookup of new upper hardlink to find its lower */
282 static bool ovl_type_merge(struct dentry *dentry)
284 return OVL_TYPE_MERGE(ovl_path_type(dentry));
287 static bool ovl_type_origin(struct dentry *dentry)
289 return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
292 static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
293 struct ovl_cattr *attr)
295 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
296 struct inode *udir = upperdir->d_inode;
297 struct dentry *newdentry;
300 if (!attr->hardlink && !IS_POSIXACL(udir))
301 attr->mode &= ~current_umask();
303 inode_lock_nested(udir, I_MUTEX_PARENT);
304 newdentry = ovl_create_real(udir,
305 lookup_one_len(dentry->d_name.name,
309 err = PTR_ERR(newdentry);
310 if (IS_ERR(newdentry))
313 if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
314 /* Setting opaque here is just an optimization, allow to fail */
315 ovl_set_opaque(dentry, newdentry);
318 err = ovl_instantiate(dentry, inode, newdentry, !!attr->hardlink);
326 ovl_cleanup(udir, newdentry);
331 static struct dentry *ovl_clear_empty(struct dentry *dentry,
332 struct list_head *list)
334 struct dentry *workdir = ovl_workdir(dentry);
335 struct inode *wdir = workdir->d_inode;
336 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
337 struct inode *udir = upperdir->d_inode;
338 struct path upperpath;
339 struct dentry *upper;
340 struct dentry *opaquedir;
344 if (WARN_ON(!workdir))
345 return ERR_PTR(-EROFS);
347 err = ovl_lock_rename_workdir(workdir, upperdir);
351 ovl_path_upper(dentry, &upperpath);
352 err = vfs_getattr(&upperpath, &stat,
353 STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
358 if (!S_ISDIR(stat.mode))
360 upper = upperpath.dentry;
361 if (upper->d_parent->d_inode != udir)
364 opaquedir = ovl_create_temp(workdir, OVL_CATTR(stat.mode));
365 err = PTR_ERR(opaquedir);
366 if (IS_ERR(opaquedir))
369 err = ovl_copy_xattr(upper, opaquedir);
373 err = ovl_set_opaque(dentry, opaquedir);
377 inode_lock(opaquedir->d_inode);
378 err = ovl_set_attr(opaquedir, &stat);
379 inode_unlock(opaquedir->d_inode);
383 err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
387 ovl_cleanup_whiteouts(upper, list);
388 ovl_cleanup(wdir, upper);
389 unlock_rename(workdir, upperdir);
391 /* dentry's upper doesn't match now, get rid of it */
397 ovl_cleanup(wdir, opaquedir);
400 unlock_rename(workdir, upperdir);
405 static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
406 const struct posix_acl *acl)
412 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
415 size = posix_acl_to_xattr(NULL, acl, NULL, 0);
416 buffer = kmalloc(size, GFP_KERNEL);
420 size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
425 err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
431 static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
432 struct ovl_cattr *cattr)
434 struct dentry *workdir = ovl_workdir(dentry);
435 struct inode *wdir = workdir->d_inode;
436 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
437 struct inode *udir = upperdir->d_inode;
438 struct dentry *upper;
439 struct dentry *newdentry;
441 struct posix_acl *acl, *default_acl;
442 bool hardlink = !!cattr->hardlink;
444 if (WARN_ON(!workdir))
448 err = posix_acl_create(dentry->d_parent->d_inode,
449 &cattr->mode, &default_acl, &acl);
454 err = ovl_lock_rename_workdir(workdir, upperdir);
458 upper = lookup_one_len(dentry->d_name.name, upperdir,
460 err = PTR_ERR(upper);
464 newdentry = ovl_create_temp(workdir, cattr);
465 err = PTR_ERR(newdentry);
466 if (IS_ERR(newdentry))
470 * mode could have been mutilated due to umask (e.g. sgid directory)
473 !S_ISLNK(cattr->mode) &&
474 newdentry->d_inode->i_mode != cattr->mode) {
475 struct iattr attr = {
476 .ia_valid = ATTR_MODE,
477 .ia_mode = cattr->mode,
479 inode_lock(newdentry->d_inode);
480 err = notify_change(newdentry, &attr, NULL);
481 inode_unlock(newdentry->d_inode);
486 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
491 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
497 if (!hardlink && S_ISDIR(cattr->mode)) {
498 err = ovl_set_opaque(dentry, newdentry);
502 err = ovl_do_rename(wdir, newdentry, udir, upper,
507 ovl_cleanup(wdir, upper);
509 err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
513 err = ovl_instantiate(dentry, inode, newdentry, hardlink);
519 unlock_rename(workdir, upperdir);
522 posix_acl_release(acl);
523 posix_acl_release(default_acl);
528 ovl_cleanup(wdir, newdentry);
533 static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
534 struct ovl_cattr *attr, bool origin)
537 const struct cred *old_cred;
538 struct cred *override_cred;
539 struct dentry *parent = dentry->d_parent;
541 err = ovl_copy_up(parent);
545 old_cred = ovl_override_creds(dentry->d_sb);
548 * When linking a file with copy up origin into a new parent, mark the
549 * new parent dir "impure".
552 err = ovl_set_impure(parent, ovl_dentry_upper(parent));
554 goto out_revert_creds;
558 override_cred = prepare_creds();
560 override_cred->fsuid = inode->i_uid;
561 override_cred->fsgid = inode->i_gid;
562 if (!attr->hardlink) {
563 err = security_dentry_create_files_as(dentry,
564 attr->mode, &dentry->d_name, old_cred,
567 put_cred(override_cred);
568 goto out_revert_creds;
571 put_cred(override_creds(override_cred));
572 put_cred(override_cred);
574 if (!ovl_dentry_is_whiteout(dentry))
575 err = ovl_create_upper(dentry, inode, attr);
577 err = ovl_create_over_whiteout(dentry, inode, attr);
580 revert_creds(old_cred);
584 static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
589 struct ovl_cattr attr = {
594 err = ovl_want_write(dentry);
598 /* Preallocate inode to be used by ovl_get_inode() */
600 inode = ovl_new_inode(dentry->d_sb, mode, rdev);
604 inode_init_owner(inode, dentry->d_parent->d_inode, mode);
605 attr.mode = inode->i_mode;
607 err = ovl_create_or_link(dentry, inode, &attr, false);
608 /* Did we end up using the preallocated inode? */
609 if (inode != d_inode(dentry))
613 ovl_drop_write(dentry);
618 static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
621 return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
624 static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
626 return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
629 static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
632 /* Don't allow creation of "whiteout" on overlay */
633 if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
636 return ovl_create_object(dentry, mode, rdev, NULL);
639 static int ovl_symlink(struct inode *dir, struct dentry *dentry,
642 return ovl_create_object(dentry, S_IFLNK, 0, link);
645 static int ovl_link(struct dentry *old, struct inode *newdir,
652 err = ovl_want_write(old);
656 err = ovl_copy_up(old);
660 err = ovl_nlink_start(old, &locked);
664 inode = d_inode(old);
667 err = ovl_create_or_link(new, inode,
668 &(struct ovl_cattr) {.hardlink = ovl_dentry_upper(old)},
669 ovl_type_origin(old));
673 ovl_nlink_end(old, locked);
680 static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)
682 return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);
685 static int ovl_remove_and_whiteout(struct dentry *dentry,
686 struct list_head *list)
688 struct dentry *workdir = ovl_workdir(dentry);
689 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
690 struct dentry *upper;
691 struct dentry *opaquedir = NULL;
694 if (WARN_ON(!workdir))
697 if (!list_empty(list)) {
698 opaquedir = ovl_clear_empty(dentry, list);
699 err = PTR_ERR(opaquedir);
700 if (IS_ERR(opaquedir))
704 err = ovl_lock_rename_workdir(workdir, upperdir);
708 upper = lookup_one_len(dentry->d_name.name, upperdir,
710 err = PTR_ERR(upper);
715 if ((opaquedir && upper != opaquedir) ||
716 (!opaquedir && ovl_dentry_upper(dentry) &&
717 !ovl_matches_upper(dentry, upper))) {
721 err = ovl_cleanup_and_whiteout(workdir, d_inode(upperdir), upper);
725 ovl_dentry_version_inc(dentry->d_parent, true);
731 unlock_rename(workdir, upperdir);
738 static int ovl_remove_upper(struct dentry *dentry, bool is_dir,
739 struct list_head *list)
741 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
742 struct inode *dir = upperdir->d_inode;
743 struct dentry *upper;
744 struct dentry *opaquedir = NULL;
747 if (!list_empty(list)) {
748 opaquedir = ovl_clear_empty(dentry, list);
749 err = PTR_ERR(opaquedir);
750 if (IS_ERR(opaquedir))
754 inode_lock_nested(dir, I_MUTEX_PARENT);
755 upper = lookup_one_len(dentry->d_name.name, upperdir,
757 err = PTR_ERR(upper);
762 if ((opaquedir && upper != opaquedir) ||
763 (!opaquedir && !ovl_matches_upper(dentry, upper)))
767 err = vfs_rmdir(dir, upper);
769 err = vfs_unlink(dir, upper, NULL);
770 ovl_dentry_version_inc(dentry->d_parent, ovl_type_origin(dentry));
773 * Keeping this dentry hashed would mean having to release
774 * upperpath/lowerpath, which could only be done if we are the
775 * sole user of this dentry. Too tricky... Just unhash for
789 static bool ovl_pure_upper(struct dentry *dentry)
791 return !ovl_dentry_lower(dentry) &&
792 !ovl_test_flag(OVL_WHITEOUTS, d_inode(dentry));
795 static int ovl_do_remove(struct dentry *dentry, bool is_dir)
799 const struct cred *old_cred;
800 bool lower_positive = ovl_lower_positive(dentry);
803 /* No need to clean pure upper removed by vfs_rmdir() */
804 if (is_dir && (lower_positive || !ovl_pure_upper(dentry))) {
805 err = ovl_check_empty_dir(dentry, &list);
810 err = ovl_want_write(dentry);
814 err = ovl_copy_up(dentry->d_parent);
818 err = ovl_nlink_start(dentry, &locked);
822 old_cred = ovl_override_creds(dentry->d_sb);
824 err = ovl_remove_upper(dentry, is_dir, &list);
826 err = ovl_remove_and_whiteout(dentry, &list);
827 revert_creds(old_cred);
830 clear_nlink(dentry->d_inode);
832 drop_nlink(dentry->d_inode);
834 ovl_nlink_end(dentry, locked);
836 ovl_drop_write(dentry);
838 ovl_cache_free(&list);
842 static int ovl_unlink(struct inode *dir, struct dentry *dentry)
844 return ovl_do_remove(dentry, false);
847 static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
849 return ovl_do_remove(dentry, true);
852 static bool ovl_type_merge_or_lower(struct dentry *dentry)
854 enum ovl_path_type type = ovl_path_type(dentry);
856 return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
859 static bool ovl_can_move(struct dentry *dentry)
861 return ovl_redirect_dir(dentry->d_sb) ||
862 !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
865 static char *ovl_get_redirect(struct dentry *dentry, bool samedir)
868 struct dentry *d, *tmp;
869 int buflen = ovl_redirect_max + 1;
872 ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
877 buf = ret = kmalloc(buflen, GFP_KERNEL);
883 for (d = dget(dentry); !IS_ROOT(d);) {
887 spin_lock(&d->d_lock);
888 name = ovl_dentry_get_redirect(d);
890 thislen = strlen(name);
892 name = d->d_name.name;
893 thislen = d->d_name.len;
896 /* If path is too long, fall back to userspace move */
897 if (thislen + (name[0] != '/') > buflen) {
898 ret = ERR_PTR(-EXDEV);
899 spin_unlock(&d->d_lock);
904 memcpy(&buf[buflen], name, thislen);
905 tmp = dget_dlock(d->d_parent);
906 spin_unlock(&d->d_lock);
911 /* Absolute redirect: finished */
912 if (buf[buflen] == '/')
917 ret = kstrdup(&buf[buflen], GFP_KERNEL);
922 return ret ? ret : ERR_PTR(-ENOMEM);
925 static int ovl_set_redirect(struct dentry *dentry, bool samedir)
928 const char *redirect = ovl_dentry_get_redirect(dentry);
930 if (redirect && (samedir || redirect[0] == '/'))
933 redirect = ovl_get_redirect(dentry, samedir);
934 if (IS_ERR(redirect))
935 return PTR_ERR(redirect);
937 err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
939 redirect, strlen(redirect), -EXDEV);
941 spin_lock(&dentry->d_lock);
942 ovl_dentry_set_redirect(dentry, redirect);
943 spin_unlock(&dentry->d_lock);
946 pr_warn_ratelimited("overlayfs: failed to set redirect (%i)\n",
948 /* Fall back to userspace copy-up */
954 static int ovl_rename(struct inode *olddir, struct dentry *old,
955 struct inode *newdir, struct dentry *new,
960 struct dentry *old_upperdir;
961 struct dentry *new_upperdir;
962 struct dentry *olddentry;
963 struct dentry *newdentry;
967 bool cleanup_whiteout = false;
968 bool overwrite = !(flags & RENAME_EXCHANGE);
969 bool is_dir = d_is_dir(old);
970 bool new_is_dir = d_is_dir(new);
971 bool samedir = olddir == newdir;
972 struct dentry *opaquedir = NULL;
973 const struct cred *old_cred = NULL;
977 if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
980 flags &= ~RENAME_NOREPLACE;
982 /* Don't copy up directory trees */
984 if (!ovl_can_move(old))
986 if (!overwrite && !ovl_can_move(new))
989 if (overwrite && new_is_dir && !ovl_pure_upper(new)) {
990 err = ovl_check_empty_dir(new, &list);
996 if (ovl_lower_positive(old)) {
997 if (!ovl_dentry_is_whiteout(new)) {
998 /* Whiteout source */
999 flags |= RENAME_WHITEOUT;
1001 /* Switch whiteouts */
1002 flags |= RENAME_EXCHANGE;
1004 } else if (is_dir && ovl_dentry_is_whiteout(new)) {
1005 flags |= RENAME_EXCHANGE;
1006 cleanup_whiteout = true;
1010 err = ovl_want_write(old);
1014 err = ovl_copy_up(old);
1016 goto out_drop_write;
1018 err = ovl_copy_up(new->d_parent);
1020 goto out_drop_write;
1022 err = ovl_copy_up(new);
1024 goto out_drop_write;
1026 err = ovl_nlink_start(new, &locked);
1028 goto out_drop_write;
1031 old_cred = ovl_override_creds(old->d_sb);
1033 if (!list_empty(&list)) {
1034 opaquedir = ovl_clear_empty(new, &list);
1035 err = PTR_ERR(opaquedir);
1036 if (IS_ERR(opaquedir)) {
1038 goto out_revert_creds;
1042 old_upperdir = ovl_dentry_upper(old->d_parent);
1043 new_upperdir = ovl_dentry_upper(new->d_parent);
1047 * When moving a merge dir or non-dir with copy up origin into
1048 * a new parent, we are marking the new parent dir "impure".
1049 * When ovl_iterate() iterates an "impure" upper dir, it will
1050 * lookup the origin inodes of the entries to fill d_ino.
1052 if (ovl_type_origin(old)) {
1053 err = ovl_set_impure(new->d_parent, new_upperdir);
1055 goto out_revert_creds;
1057 if (!overwrite && ovl_type_origin(new)) {
1058 err = ovl_set_impure(old->d_parent, old_upperdir);
1060 goto out_revert_creds;
1064 trap = lock_rename(new_upperdir, old_upperdir);
1066 olddentry = lookup_one_len(old->d_name.name, old_upperdir,
1068 err = PTR_ERR(olddentry);
1069 if (IS_ERR(olddentry))
1073 if (!ovl_matches_upper(old, olddentry))
1076 newdentry = lookup_one_len(new->d_name.name, new_upperdir,
1078 err = PTR_ERR(newdentry);
1079 if (IS_ERR(newdentry))
1082 old_opaque = ovl_dentry_is_opaque(old);
1083 new_opaque = ovl_dentry_is_opaque(new);
1086 if (d_inode(new) && ovl_dentry_upper(new)) {
1088 if (newdentry != opaquedir)
1091 if (!ovl_matches_upper(new, newdentry))
1095 if (!d_is_negative(newdentry) &&
1096 (!new_opaque || !ovl_is_whiteout(newdentry)))
1100 if (olddentry == trap)
1102 if (newdentry == trap)
1105 if (WARN_ON(olddentry->d_inode == newdentry->d_inode))
1110 if (ovl_type_merge_or_lower(old))
1111 err = ovl_set_redirect(old, samedir);
1112 else if (!old_opaque && ovl_type_merge(new->d_parent))
1113 err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
1117 if (!overwrite && new_is_dir) {
1118 if (ovl_type_merge_or_lower(new))
1119 err = ovl_set_redirect(new, samedir);
1120 else if (!new_opaque && ovl_type_merge(old->d_parent))
1121 err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
1126 err = ovl_do_rename(old_upperdir->d_inode, olddentry,
1127 new_upperdir->d_inode, newdentry, flags);
1131 if (cleanup_whiteout)
1132 ovl_cleanup(old_upperdir->d_inode, newdentry);
1134 if (overwrite && d_inode(new)) {
1136 clear_nlink(d_inode(new));
1138 drop_nlink(d_inode(new));
1141 ovl_dentry_version_inc(old->d_parent, ovl_type_origin(old) ||
1142 (!overwrite && ovl_type_origin(new)));
1143 ovl_dentry_version_inc(new->d_parent, ovl_type_origin(old) ||
1144 (d_inode(new) && ovl_type_origin(new)));
1151 unlock_rename(new_upperdir, old_upperdir);
1153 revert_creds(old_cred);
1154 ovl_nlink_end(new, locked);
1156 ovl_drop_write(old);
1159 ovl_cache_free(&list);
1163 const struct inode_operations ovl_dir_inode_operations = {
1164 .lookup = ovl_lookup,
1166 .symlink = ovl_symlink,
1167 .unlink = ovl_unlink,
1169 .rename = ovl_rename,
1171 .setattr = ovl_setattr,
1172 .create = ovl_create,
1174 .permission = ovl_permission,
1175 .getattr = ovl_getattr,
1176 .listxattr = ovl_listxattr,
1177 .get_acl = ovl_get_acl,
1178 .update_time = ovl_update_time,