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 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,
67 struct dentry *dentry)
70 struct dentry *whiteout;
71 struct inode *wdir = workdir->d_inode;
73 whiteout = ovl_lookup_temp(workdir);
77 err = ovl_do_whiteout(wdir, whiteout);
80 whiteout = ERR_PTR(err);
86 int ovl_create_real(struct inode *dir, struct dentry *newdentry,
87 struct cattr *attr, struct dentry *hardlink, bool debug)
91 if (newdentry->d_inode)
95 err = ovl_do_link(hardlink, dir, newdentry, debug);
97 switch (attr->mode & S_IFMT) {
99 err = ovl_do_create(dir, newdentry, attr->mode, debug);
103 err = ovl_do_mkdir(dir, newdentry, attr->mode, debug);
110 err = ovl_do_mknod(dir, newdentry,
111 attr->mode, attr->rdev, debug);
115 err = ovl_do_symlink(dir, newdentry, attr->link, debug);
122 if (!err && WARN_ON(!newdentry->d_inode)) {
124 * Not quite sure if non-instantiated dentry is legal or not.
125 * VFS doesn't seem to care so check and warn here.
132 static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
137 err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
139 ovl_dentry_set_opaque(dentry);
144 static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
147 * Fail with -EIO when trying to create opaque dir and upper doesn't
148 * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
149 * return a specific error for noxattr case.
151 return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
154 /* Common operations required to be done after creation of file on upper */
155 static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
156 struct dentry *newdentry, bool hardlink)
158 ovl_dentry_version_inc(dentry->d_parent);
159 ovl_dentry_set_upper_alias(dentry);
161 ovl_inode_update(inode, newdentry);
162 ovl_copyattr(newdentry->d_inode, inode);
164 WARN_ON(ovl_inode_real(inode) != d_inode(newdentry));
168 d_instantiate(dentry, inode);
169 /* Force lookup of new upper hardlink to find its lower */
174 static bool ovl_type_merge(struct dentry *dentry)
176 return OVL_TYPE_MERGE(ovl_path_type(dentry));
179 static bool ovl_type_origin(struct dentry *dentry)
181 return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
184 static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
185 struct cattr *attr, struct dentry *hardlink)
187 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
188 struct inode *udir = upperdir->d_inode;
189 struct dentry *newdentry;
192 if (!hardlink && !IS_POSIXACL(udir))
193 attr->mode &= ~current_umask();
195 inode_lock_nested(udir, I_MUTEX_PARENT);
196 newdentry = lookup_one_len(dentry->d_name.name, upperdir,
198 err = PTR_ERR(newdentry);
199 if (IS_ERR(newdentry))
201 err = ovl_create_real(udir, newdentry, attr, hardlink, false);
205 if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
206 /* Setting opaque here is just an optimization, allow to fail */
207 ovl_set_opaque(dentry, newdentry);
210 ovl_instantiate(dentry, inode, newdentry, !!hardlink);
219 static int ovl_lock_rename_workdir(struct dentry *workdir,
220 struct dentry *upperdir)
222 /* Workdir should not be the same as upperdir */
223 if (workdir == upperdir)
226 /* Workdir should not be subdir of upperdir and vice versa */
227 if (lock_rename(workdir, upperdir) != NULL)
233 unlock_rename(workdir, upperdir);
235 pr_err("overlayfs: failed to lock workdir+upperdir\n");
239 static struct dentry *ovl_clear_empty(struct dentry *dentry,
240 struct list_head *list)
242 struct dentry *workdir = ovl_workdir(dentry);
243 struct inode *wdir = workdir->d_inode;
244 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
245 struct inode *udir = upperdir->d_inode;
246 struct path upperpath;
247 struct dentry *upper;
248 struct dentry *opaquedir;
252 if (WARN_ON(!workdir))
253 return ERR_PTR(-EROFS);
255 err = ovl_lock_rename_workdir(workdir, upperdir);
259 ovl_path_upper(dentry, &upperpath);
260 err = vfs_getattr(&upperpath, &stat,
261 STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
266 if (!S_ISDIR(stat.mode))
268 upper = upperpath.dentry;
269 if (upper->d_parent->d_inode != udir)
272 opaquedir = ovl_lookup_temp(workdir);
273 err = PTR_ERR(opaquedir);
274 if (IS_ERR(opaquedir))
277 err = ovl_create_real(wdir, opaquedir,
278 &(struct cattr){.mode = stat.mode}, NULL, true);
282 err = ovl_copy_xattr(upper, opaquedir);
286 err = ovl_set_opaque(dentry, opaquedir);
290 inode_lock(opaquedir->d_inode);
291 err = ovl_set_attr(opaquedir, &stat);
292 inode_unlock(opaquedir->d_inode);
296 err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
300 ovl_cleanup_whiteouts(upper, list);
301 ovl_cleanup(wdir, upper);
302 unlock_rename(workdir, upperdir);
304 /* dentry's upper doesn't match now, get rid of it */
310 ovl_cleanup(wdir, opaquedir);
314 unlock_rename(workdir, upperdir);
319 static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry)
322 struct dentry *ret = NULL;
323 enum ovl_path_type type = ovl_path_type(dentry);
326 err = ovl_check_empty_dir(dentry, &list);
333 * When removing an empty opaque directory, then it makes no sense to
334 * replace it with an exact replica of itself.
336 * If no upperdentry then skip clearing whiteouts.
338 * Can race with copy-up, since we don't hold the upperdir mutex.
339 * Doesn't matter, since copy-up can't create a non-empty directory
342 if (OVL_TYPE_UPPER(type) && OVL_TYPE_MERGE(type))
343 ret = ovl_clear_empty(dentry, &list);
346 ovl_cache_free(&list);
351 static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
352 const struct posix_acl *acl)
358 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
361 size = posix_acl_to_xattr(NULL, acl, NULL, 0);
362 buffer = kmalloc(size, GFP_KERNEL);
366 size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
371 err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
377 static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
379 struct dentry *hardlink)
381 struct dentry *workdir = ovl_workdir(dentry);
382 struct inode *wdir = workdir->d_inode;
383 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
384 struct inode *udir = upperdir->d_inode;
385 struct dentry *upper;
386 struct dentry *newdentry;
388 struct posix_acl *acl, *default_acl;
390 if (WARN_ON(!workdir))
394 err = posix_acl_create(dentry->d_parent->d_inode,
395 &cattr->mode, &default_acl, &acl);
400 err = ovl_lock_rename_workdir(workdir, upperdir);
404 newdentry = ovl_lookup_temp(workdir);
405 err = PTR_ERR(newdentry);
406 if (IS_ERR(newdentry))
409 upper = lookup_one_len(dentry->d_name.name, upperdir,
411 err = PTR_ERR(upper);
415 err = ovl_create_real(wdir, newdentry, cattr, hardlink, true);
420 * mode could have been mutilated due to umask (e.g. sgid directory)
423 !S_ISLNK(cattr->mode) &&
424 newdentry->d_inode->i_mode != cattr->mode) {
425 struct iattr attr = {
426 .ia_valid = ATTR_MODE,
427 .ia_mode = cattr->mode,
429 inode_lock(newdentry->d_inode);
430 err = notify_change(newdentry, &attr, NULL);
431 inode_unlock(newdentry->d_inode);
436 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
441 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
447 if (!hardlink && S_ISDIR(cattr->mode)) {
448 err = ovl_set_opaque(dentry, newdentry);
452 err = ovl_do_rename(wdir, newdentry, udir, upper,
457 ovl_cleanup(wdir, upper);
459 err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
463 ovl_instantiate(dentry, inode, newdentry, !!hardlink);
470 unlock_rename(workdir, upperdir);
473 posix_acl_release(acl);
474 posix_acl_release(default_acl);
479 ovl_cleanup(wdir, newdentry);
483 static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
484 struct cattr *attr, struct dentry *hardlink,
488 const struct cred *old_cred;
489 struct cred *override_cred;
490 struct dentry *parent = dentry->d_parent;
492 err = ovl_copy_up(parent);
496 old_cred = ovl_override_creds(dentry->d_sb);
499 * When linking a file with copy up origin into a new parent, mark the
500 * new parent dir "impure".
503 err = ovl_set_impure(parent, ovl_dentry_upper(parent));
505 goto out_revert_creds;
509 override_cred = prepare_creds();
511 override_cred->fsuid = inode->i_uid;
512 override_cred->fsgid = inode->i_gid;
514 err = security_dentry_create_files_as(dentry,
515 attr->mode, &dentry->d_name, old_cred,
518 put_cred(override_cred);
519 goto out_revert_creds;
522 put_cred(override_creds(override_cred));
523 put_cred(override_cred);
525 if (!ovl_dentry_is_whiteout(dentry))
526 err = ovl_create_upper(dentry, inode, attr,
529 err = ovl_create_over_whiteout(dentry, inode, attr,
533 revert_creds(old_cred);
535 struct inode *realinode = d_inode(ovl_dentry_upper(dentry));
537 WARN_ON(inode->i_mode != realinode->i_mode);
538 WARN_ON(!uid_eq(inode->i_uid, realinode->i_uid));
539 WARN_ON(!gid_eq(inode->i_gid, realinode->i_gid));
544 static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
549 struct cattr attr = {
554 err = ovl_want_write(dentry);
559 inode = ovl_new_inode(dentry->d_sb, mode, rdev);
563 inode_init_owner(inode, dentry->d_parent->d_inode, mode);
564 attr.mode = inode->i_mode;
566 err = ovl_create_or_link(dentry, inode, &attr, NULL, false);
571 ovl_drop_write(dentry);
576 static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
579 return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
582 static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
584 return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
587 static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
590 /* Don't allow creation of "whiteout" on overlay */
591 if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
594 return ovl_create_object(dentry, mode, rdev, NULL);
597 static int ovl_symlink(struct inode *dir, struct dentry *dentry,
600 return ovl_create_object(dentry, S_IFLNK, 0, link);
603 static int ovl_link(struct dentry *old, struct inode *newdir,
610 err = ovl_want_write(old);
614 err = ovl_copy_up(old);
618 err = ovl_nlink_start(old, &locked);
622 inode = d_inode(old);
625 err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old),
626 ovl_type_origin(old));
630 ovl_nlink_end(old, locked);
637 static bool ovl_matches_upper(struct dentry *dentry, struct dentry *upper)
639 return d_inode(ovl_dentry_upper(dentry)) == d_inode(upper);
642 static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)
644 struct dentry *workdir = ovl_workdir(dentry);
645 struct inode *wdir = workdir->d_inode;
646 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
647 struct inode *udir = upperdir->d_inode;
648 struct dentry *whiteout;
649 struct dentry *upper;
650 struct dentry *opaquedir = NULL;
654 if (WARN_ON(!workdir))
658 opaquedir = ovl_check_empty_and_clear(dentry);
659 err = PTR_ERR(opaquedir);
660 if (IS_ERR(opaquedir))
664 err = ovl_lock_rename_workdir(workdir, upperdir);
668 upper = lookup_one_len(dentry->d_name.name, upperdir,
670 err = PTR_ERR(upper);
675 if ((opaquedir && upper != opaquedir) ||
676 (!opaquedir && ovl_dentry_upper(dentry) &&
677 !ovl_matches_upper(dentry, upper))) {
681 whiteout = ovl_whiteout(workdir, dentry);
682 err = PTR_ERR(whiteout);
683 if (IS_ERR(whiteout))
687 flags = RENAME_EXCHANGE;
689 err = ovl_do_rename(wdir, whiteout, udir, upper, flags);
693 ovl_cleanup(wdir, upper);
695 ovl_dentry_version_inc(dentry->d_parent);
702 unlock_rename(workdir, upperdir);
709 ovl_cleanup(wdir, whiteout);
713 static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
715 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
716 struct inode *dir = upperdir->d_inode;
717 struct dentry *upper;
718 struct dentry *opaquedir = NULL;
721 /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */
722 if (is_dir && ovl_dentry_get_redirect(dentry)) {
723 opaquedir = ovl_check_empty_and_clear(dentry);
724 err = PTR_ERR(opaquedir);
725 if (IS_ERR(opaquedir))
729 inode_lock_nested(dir, I_MUTEX_PARENT);
730 upper = lookup_one_len(dentry->d_name.name, upperdir,
732 err = PTR_ERR(upper);
737 if ((opaquedir && upper != opaquedir) ||
738 (!opaquedir && !ovl_matches_upper(dentry, upper)))
742 err = vfs_rmdir(dir, upper);
744 err = vfs_unlink(dir, upper, NULL);
745 ovl_dentry_version_inc(dentry->d_parent);
748 * Keeping this dentry hashed would mean having to release
749 * upperpath/lowerpath, which could only be done if we are the
750 * sole user of this dentry. Too tricky... Just unhash for
764 static int ovl_do_remove(struct dentry *dentry, bool is_dir)
768 const struct cred *old_cred;
770 err = ovl_want_write(dentry);
774 err = ovl_copy_up(dentry->d_parent);
778 err = ovl_nlink_start(dentry, &locked);
782 old_cred = ovl_override_creds(dentry->d_sb);
783 if (!ovl_lower_positive(dentry))
784 err = ovl_remove_upper(dentry, is_dir);
786 err = ovl_remove_and_whiteout(dentry, is_dir);
787 revert_creds(old_cred);
790 clear_nlink(dentry->d_inode);
792 drop_nlink(dentry->d_inode);
794 ovl_nlink_end(dentry, locked);
796 ovl_drop_write(dentry);
801 static int ovl_unlink(struct inode *dir, struct dentry *dentry)
803 return ovl_do_remove(dentry, false);
806 static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
808 return ovl_do_remove(dentry, true);
811 static bool ovl_type_merge_or_lower(struct dentry *dentry)
813 enum ovl_path_type type = ovl_path_type(dentry);
815 return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
818 static bool ovl_can_move(struct dentry *dentry)
820 return ovl_redirect_dir(dentry->d_sb) ||
821 !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
824 static char *ovl_get_redirect(struct dentry *dentry, bool samedir)
827 struct dentry *d, *tmp;
828 int buflen = ovl_redirect_max + 1;
831 ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
836 buf = ret = kmalloc(buflen, GFP_TEMPORARY);
842 for (d = dget(dentry); !IS_ROOT(d);) {
846 spin_lock(&d->d_lock);
847 name = ovl_dentry_get_redirect(d);
849 thislen = strlen(name);
851 name = d->d_name.name;
852 thislen = d->d_name.len;
855 /* If path is too long, fall back to userspace move */
856 if (thislen + (name[0] != '/') > buflen) {
857 ret = ERR_PTR(-EXDEV);
858 spin_unlock(&d->d_lock);
863 memcpy(&buf[buflen], name, thislen);
864 tmp = dget_dlock(d->d_parent);
865 spin_unlock(&d->d_lock);
870 /* Absolute redirect: finished */
871 if (buf[buflen] == '/')
876 ret = kstrdup(&buf[buflen], GFP_KERNEL);
881 return ret ? ret : ERR_PTR(-ENOMEM);
884 static int ovl_set_redirect(struct dentry *dentry, bool samedir)
887 const char *redirect = ovl_dentry_get_redirect(dentry);
889 if (redirect && (samedir || redirect[0] == '/'))
892 redirect = ovl_get_redirect(dentry, samedir);
893 if (IS_ERR(redirect))
894 return PTR_ERR(redirect);
896 err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
898 redirect, strlen(redirect), -EXDEV);
900 spin_lock(&dentry->d_lock);
901 ovl_dentry_set_redirect(dentry, redirect);
902 spin_unlock(&dentry->d_lock);
905 pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err);
906 /* Fall back to userspace copy-up */
912 static int ovl_rename(struct inode *olddir, struct dentry *old,
913 struct inode *newdir, struct dentry *new,
918 struct dentry *old_upperdir;
919 struct dentry *new_upperdir;
920 struct dentry *olddentry;
921 struct dentry *newdentry;
925 bool cleanup_whiteout = false;
926 bool overwrite = !(flags & RENAME_EXCHANGE);
927 bool is_dir = d_is_dir(old);
928 bool new_is_dir = d_is_dir(new);
929 bool samedir = olddir == newdir;
930 struct dentry *opaquedir = NULL;
931 const struct cred *old_cred = NULL;
934 if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
937 flags &= ~RENAME_NOREPLACE;
939 /* Don't copy up directory trees */
941 if (!ovl_can_move(old))
943 if (!overwrite && !ovl_can_move(new))
946 err = ovl_want_write(old);
950 err = ovl_copy_up(old);
954 err = ovl_copy_up(new->d_parent);
958 err = ovl_copy_up(new);
962 err = ovl_nlink_start(new, &locked);
967 old_cred = ovl_override_creds(old->d_sb);
969 if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) {
970 opaquedir = ovl_check_empty_and_clear(new);
971 err = PTR_ERR(opaquedir);
972 if (IS_ERR(opaquedir)) {
974 goto out_revert_creds;
979 if (ovl_lower_positive(old)) {
980 if (!ovl_dentry_is_whiteout(new)) {
981 /* Whiteout source */
982 flags |= RENAME_WHITEOUT;
984 /* Switch whiteouts */
985 flags |= RENAME_EXCHANGE;
987 } else if (is_dir && ovl_dentry_is_whiteout(new)) {
988 flags |= RENAME_EXCHANGE;
989 cleanup_whiteout = true;
993 old_upperdir = ovl_dentry_upper(old->d_parent);
994 new_upperdir = ovl_dentry_upper(new->d_parent);
998 * When moving a merge dir or non-dir with copy up origin into
999 * a new parent, we are marking the new parent dir "impure".
1000 * When ovl_iterate() iterates an "impure" upper dir, it will
1001 * lookup the origin inodes of the entries to fill d_ino.
1003 if (ovl_type_origin(old)) {
1004 err = ovl_set_impure(new->d_parent, new_upperdir);
1006 goto out_revert_creds;
1008 if (!overwrite && ovl_type_origin(new)) {
1009 err = ovl_set_impure(old->d_parent, old_upperdir);
1011 goto out_revert_creds;
1015 trap = lock_rename(new_upperdir, old_upperdir);
1017 olddentry = lookup_one_len(old->d_name.name, old_upperdir,
1019 err = PTR_ERR(olddentry);
1020 if (IS_ERR(olddentry))
1024 if (!ovl_matches_upper(old, olddentry))
1027 newdentry = lookup_one_len(new->d_name.name, new_upperdir,
1029 err = PTR_ERR(newdentry);
1030 if (IS_ERR(newdentry))
1033 old_opaque = ovl_dentry_is_opaque(old);
1034 new_opaque = ovl_dentry_is_opaque(new);
1037 if (d_inode(new) && ovl_dentry_upper(new)) {
1039 if (newdentry != opaquedir)
1042 if (!ovl_matches_upper(new, newdentry))
1046 if (!d_is_negative(newdentry) &&
1047 (!new_opaque || !ovl_is_whiteout(newdentry)))
1051 if (olddentry == trap)
1053 if (newdentry == trap)
1056 if (WARN_ON(olddentry->d_inode == newdentry->d_inode))
1061 if (ovl_type_merge_or_lower(old))
1062 err = ovl_set_redirect(old, samedir);
1063 else if (!old_opaque && ovl_type_merge(new->d_parent))
1064 err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
1068 if (!overwrite && new_is_dir) {
1069 if (ovl_type_merge_or_lower(new))
1070 err = ovl_set_redirect(new, samedir);
1071 else if (!new_opaque && ovl_type_merge(old->d_parent))
1072 err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
1077 err = ovl_do_rename(old_upperdir->d_inode, olddentry,
1078 new_upperdir->d_inode, newdentry, flags);
1082 if (cleanup_whiteout)
1083 ovl_cleanup(old_upperdir->d_inode, newdentry);
1085 if (overwrite && d_inode(new)) {
1087 clear_nlink(d_inode(new));
1089 drop_nlink(d_inode(new));
1092 ovl_dentry_version_inc(old->d_parent);
1093 ovl_dentry_version_inc(new->d_parent);
1100 unlock_rename(new_upperdir, old_upperdir);
1102 revert_creds(old_cred);
1103 ovl_nlink_end(new, locked);
1105 ovl_drop_write(old);
1111 const struct inode_operations ovl_dir_inode_operations = {
1112 .lookup = ovl_lookup,
1114 .symlink = ovl_symlink,
1115 .unlink = ovl_unlink,
1117 .rename = ovl_rename,
1119 .setattr = ovl_setattr,
1120 .create = ovl_create,
1122 .permission = ovl_permission,
1123 .getattr = ovl_getattr,
1124 .listxattr = ovl_listxattr,
1125 .get_acl = ovl_get_acl,
1126 .update_time = ovl_update_time,