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 void 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",
44 struct dentry *ovl_lookup_temp(struct dentry *workdir)
48 static atomic_t temp_id = ATOMIC_INIT(0);
50 /* counter is allowed to wrap, since temp dentries are ephemeral */
51 snprintf(name, sizeof(name), "#%x", atomic_inc_return(&temp_id));
53 temp = lookup_one_len(name, workdir, strlen(name));
54 if (!IS_ERR(temp) && temp->d_inode) {
55 pr_err("overlayfs: workdir/%s already exists\n", name);
63 /* caller holds i_mutex on workdir */
64 static struct dentry *ovl_whiteout(struct dentry *workdir,
65 struct dentry *dentry)
68 struct dentry *whiteout;
69 struct inode *wdir = workdir->d_inode;
71 whiteout = ovl_lookup_temp(workdir);
75 err = ovl_do_whiteout(wdir, whiteout);
78 whiteout = ERR_PTR(err);
84 int ovl_create_real(struct inode *dir, struct dentry *newdentry,
85 struct cattr *attr, struct dentry *hardlink, bool debug)
89 if (newdentry->d_inode)
93 err = ovl_do_link(hardlink, dir, newdentry, debug);
95 switch (attr->mode & S_IFMT) {
97 err = ovl_do_create(dir, newdentry, attr->mode, debug);
101 err = ovl_do_mkdir(dir, newdentry, attr->mode, debug);
108 err = ovl_do_mknod(dir, newdentry,
109 attr->mode, attr->rdev, debug);
113 err = ovl_do_symlink(dir, newdentry, attr->link, debug);
120 if (!err && WARN_ON(!newdentry->d_inode)) {
122 * Not quite sure if non-instantiated dentry is legal or not.
123 * VFS doesn't seem to care so check and warn here.
130 static int ovl_set_opaque_xerr(struct dentry *dentry, struct dentry *upper,
135 err = ovl_check_setxattr(dentry, upper, OVL_XATTR_OPAQUE, "y", 1, xerr);
137 ovl_dentry_set_opaque(dentry);
142 static int ovl_set_opaque(struct dentry *dentry, struct dentry *upperdentry)
145 * Fail with -EIO when trying to create opaque dir and upper doesn't
146 * support xattrs. ovl_rename() calls ovl_set_opaque_xerr(-EXDEV) to
147 * return a specific error for noxattr case.
149 return ovl_set_opaque_xerr(dentry, upperdentry, -EIO);
152 /* Common operations required to be done after creation of file on upper */
153 static void ovl_instantiate(struct dentry *dentry, struct inode *inode,
154 struct dentry *newdentry, bool hardlink)
156 ovl_dentry_version_inc(dentry->d_parent);
157 ovl_dentry_update(dentry, newdentry);
159 ovl_inode_update(inode, d_inode(newdentry));
160 ovl_copyattr(newdentry->d_inode, inode);
162 WARN_ON(ovl_inode_real(inode, NULL) != d_inode(newdentry));
165 d_instantiate(dentry, inode);
166 /* Force lookup of new upper hardlink to find its lower */
171 static bool ovl_type_merge(struct dentry *dentry)
173 return OVL_TYPE_MERGE(ovl_path_type(dentry));
176 static bool ovl_type_origin(struct dentry *dentry)
178 return OVL_TYPE_ORIGIN(ovl_path_type(dentry));
181 static int ovl_create_upper(struct dentry *dentry, struct inode *inode,
182 struct cattr *attr, struct dentry *hardlink)
184 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
185 struct inode *udir = upperdir->d_inode;
186 struct dentry *newdentry;
189 if (!hardlink && !IS_POSIXACL(udir))
190 attr->mode &= ~current_umask();
192 inode_lock_nested(udir, I_MUTEX_PARENT);
193 newdentry = lookup_one_len(dentry->d_name.name, upperdir,
195 err = PTR_ERR(newdentry);
196 if (IS_ERR(newdentry))
198 err = ovl_create_real(udir, newdentry, attr, hardlink, false);
202 if (ovl_type_merge(dentry->d_parent) && d_is_dir(newdentry)) {
203 /* Setting opaque here is just an optimization, allow to fail */
204 ovl_set_opaque(dentry, newdentry);
207 ovl_instantiate(dentry, inode, newdentry, !!hardlink);
216 static int ovl_lock_rename_workdir(struct dentry *workdir,
217 struct dentry *upperdir)
219 /* Workdir should not be the same as upperdir */
220 if (workdir == upperdir)
223 /* Workdir should not be subdir of upperdir and vice versa */
224 if (lock_rename(workdir, upperdir) != NULL)
230 unlock_rename(workdir, upperdir);
232 pr_err("overlayfs: failed to lock workdir+upperdir\n");
236 static struct dentry *ovl_clear_empty(struct dentry *dentry,
237 struct list_head *list)
239 struct dentry *workdir = ovl_workdir(dentry);
240 struct inode *wdir = workdir->d_inode;
241 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
242 struct inode *udir = upperdir->d_inode;
243 struct path upperpath;
244 struct dentry *upper;
245 struct dentry *opaquedir;
249 if (WARN_ON(!workdir))
250 return ERR_PTR(-EROFS);
252 err = ovl_lock_rename_workdir(workdir, upperdir);
256 ovl_path_upper(dentry, &upperpath);
257 err = vfs_getattr(&upperpath, &stat,
258 STATX_BASIC_STATS, AT_STATX_SYNC_AS_STAT);
263 if (!S_ISDIR(stat.mode))
265 upper = upperpath.dentry;
266 if (upper->d_parent->d_inode != udir)
269 opaquedir = ovl_lookup_temp(workdir);
270 err = PTR_ERR(opaquedir);
271 if (IS_ERR(opaquedir))
274 err = ovl_create_real(wdir, opaquedir,
275 &(struct cattr){.mode = stat.mode}, NULL, true);
279 err = ovl_copy_xattr(upper, opaquedir);
283 err = ovl_set_opaque(dentry, opaquedir);
287 inode_lock(opaquedir->d_inode);
288 err = ovl_set_attr(opaquedir, &stat);
289 inode_unlock(opaquedir->d_inode);
293 err = ovl_do_rename(wdir, opaquedir, udir, upper, RENAME_EXCHANGE);
297 ovl_cleanup_whiteouts(upper, list);
298 ovl_cleanup(wdir, upper);
299 unlock_rename(workdir, upperdir);
301 /* dentry's upper doesn't match now, get rid of it */
307 ovl_cleanup(wdir, opaquedir);
311 unlock_rename(workdir, upperdir);
316 static struct dentry *ovl_check_empty_and_clear(struct dentry *dentry)
319 struct dentry *ret = NULL;
320 enum ovl_path_type type = ovl_path_type(dentry);
323 err = ovl_check_empty_dir(dentry, &list);
330 * When removing an empty opaque directory, then it makes no sense to
331 * replace it with an exact replica of itself.
333 * If no upperdentry then skip clearing whiteouts.
335 * Can race with copy-up, since we don't hold the upperdir mutex.
336 * Doesn't matter, since copy-up can't create a non-empty directory
339 if (OVL_TYPE_UPPER(type) && OVL_TYPE_MERGE(type))
340 ret = ovl_clear_empty(dentry, &list);
343 ovl_cache_free(&list);
348 static int ovl_set_upper_acl(struct dentry *upperdentry, const char *name,
349 const struct posix_acl *acl)
355 if (!IS_ENABLED(CONFIG_FS_POSIX_ACL) || !acl)
358 size = posix_acl_to_xattr(NULL, acl, NULL, 0);
359 buffer = kmalloc(size, GFP_KERNEL);
363 size = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
368 err = vfs_setxattr(upperdentry, name, buffer, size, XATTR_CREATE);
374 static int ovl_create_over_whiteout(struct dentry *dentry, struct inode *inode,
376 struct dentry *hardlink)
378 struct dentry *workdir = ovl_workdir(dentry);
379 struct inode *wdir = workdir->d_inode;
380 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
381 struct inode *udir = upperdir->d_inode;
382 struct dentry *upper;
383 struct dentry *newdentry;
385 struct posix_acl *acl, *default_acl;
387 if (WARN_ON(!workdir))
391 err = posix_acl_create(dentry->d_parent->d_inode,
392 &cattr->mode, &default_acl, &acl);
397 err = ovl_lock_rename_workdir(workdir, upperdir);
401 newdentry = ovl_lookup_temp(workdir);
402 err = PTR_ERR(newdentry);
403 if (IS_ERR(newdentry))
406 upper = lookup_one_len(dentry->d_name.name, upperdir,
408 err = PTR_ERR(upper);
412 err = ovl_create_real(wdir, newdentry, cattr, hardlink, true);
417 * mode could have been mutilated due to umask (e.g. sgid directory)
420 !S_ISLNK(cattr->mode) &&
421 newdentry->d_inode->i_mode != cattr->mode) {
422 struct iattr attr = {
423 .ia_valid = ATTR_MODE,
424 .ia_mode = cattr->mode,
426 inode_lock(newdentry->d_inode);
427 err = notify_change(newdentry, &attr, NULL);
428 inode_unlock(newdentry->d_inode);
433 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_ACCESS,
438 err = ovl_set_upper_acl(newdentry, XATTR_NAME_POSIX_ACL_DEFAULT,
444 if (!hardlink && S_ISDIR(cattr->mode)) {
445 err = ovl_set_opaque(dentry, newdentry);
449 err = ovl_do_rename(wdir, newdentry, udir, upper,
454 ovl_cleanup(wdir, upper);
456 err = ovl_do_rename(wdir, newdentry, udir, upper, 0);
460 ovl_instantiate(dentry, inode, newdentry, !!hardlink);
467 unlock_rename(workdir, upperdir);
470 posix_acl_release(acl);
471 posix_acl_release(default_acl);
476 ovl_cleanup(wdir, newdentry);
480 static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
481 struct cattr *attr, struct dentry *hardlink)
484 const struct cred *old_cred;
485 struct cred *override_cred;
487 err = ovl_copy_up(dentry->d_parent);
491 old_cred = ovl_override_creds(dentry->d_sb);
493 override_cred = prepare_creds();
495 override_cred->fsuid = inode->i_uid;
496 override_cred->fsgid = inode->i_gid;
498 err = security_dentry_create_files_as(dentry,
499 attr->mode, &dentry->d_name, old_cred,
502 put_cred(override_cred);
503 goto out_revert_creds;
506 put_cred(override_creds(override_cred));
507 put_cred(override_cred);
509 if (!ovl_dentry_is_whiteout(dentry))
510 err = ovl_create_upper(dentry, inode, attr,
513 err = ovl_create_over_whiteout(dentry, inode, attr,
517 revert_creds(old_cred);
519 struct inode *realinode = d_inode(ovl_dentry_upper(dentry));
521 WARN_ON(inode->i_mode != realinode->i_mode);
522 WARN_ON(!uid_eq(inode->i_uid, realinode->i_uid));
523 WARN_ON(!gid_eq(inode->i_gid, realinode->i_gid));
528 static int ovl_create_object(struct dentry *dentry, int mode, dev_t rdev,
533 struct cattr attr = {
538 err = ovl_want_write(dentry);
543 inode = ovl_new_inode(dentry->d_sb, mode, rdev);
547 inode_init_owner(inode, dentry->d_parent->d_inode, mode);
548 attr.mode = inode->i_mode;
550 err = ovl_create_or_link(dentry, inode, &attr, NULL);
555 ovl_drop_write(dentry);
560 static int ovl_create(struct inode *dir, struct dentry *dentry, umode_t mode,
563 return ovl_create_object(dentry, (mode & 07777) | S_IFREG, 0, NULL);
566 static int ovl_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
568 return ovl_create_object(dentry, (mode & 07777) | S_IFDIR, 0, NULL);
571 static int ovl_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
574 /* Don't allow creation of "whiteout" on overlay */
575 if (S_ISCHR(mode) && rdev == WHITEOUT_DEV)
578 return ovl_create_object(dentry, mode, rdev, NULL);
581 static int ovl_symlink(struct inode *dir, struct dentry *dentry,
584 return ovl_create_object(dentry, S_IFLNK, 0, link);
587 static int ovl_link(struct dentry *old, struct inode *newdir,
593 err = ovl_want_write(old);
597 err = ovl_copy_up(old);
601 inode = d_inode(old);
604 err = ovl_create_or_link(new, inode, NULL, ovl_dentry_upper(old));
614 static int ovl_remove_and_whiteout(struct dentry *dentry, bool is_dir)
616 struct dentry *workdir = ovl_workdir(dentry);
617 struct inode *wdir = workdir->d_inode;
618 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
619 struct inode *udir = upperdir->d_inode;
620 struct dentry *whiteout;
621 struct dentry *upper;
622 struct dentry *opaquedir = NULL;
626 if (WARN_ON(!workdir))
630 opaquedir = ovl_check_empty_and_clear(dentry);
631 err = PTR_ERR(opaquedir);
632 if (IS_ERR(opaquedir))
636 err = ovl_lock_rename_workdir(workdir, upperdir);
640 upper = lookup_one_len(dentry->d_name.name, upperdir,
642 err = PTR_ERR(upper);
647 if ((opaquedir && upper != opaquedir) ||
648 (!opaquedir && ovl_dentry_upper(dentry) &&
649 upper != ovl_dentry_upper(dentry))) {
653 whiteout = ovl_whiteout(workdir, dentry);
654 err = PTR_ERR(whiteout);
655 if (IS_ERR(whiteout))
659 flags = RENAME_EXCHANGE;
661 err = ovl_do_rename(wdir, whiteout, udir, upper, flags);
665 ovl_cleanup(wdir, upper);
667 ovl_dentry_version_inc(dentry->d_parent);
674 unlock_rename(workdir, upperdir);
681 ovl_cleanup(wdir, whiteout);
685 static int ovl_remove_upper(struct dentry *dentry, bool is_dir)
687 struct dentry *upperdir = ovl_dentry_upper(dentry->d_parent);
688 struct inode *dir = upperdir->d_inode;
689 struct dentry *upper;
690 struct dentry *opaquedir = NULL;
693 /* Redirect dir can be !ovl_lower_positive && OVL_TYPE_MERGE */
694 if (is_dir && ovl_dentry_get_redirect(dentry)) {
695 opaquedir = ovl_check_empty_and_clear(dentry);
696 err = PTR_ERR(opaquedir);
697 if (IS_ERR(opaquedir))
701 inode_lock_nested(dir, I_MUTEX_PARENT);
702 upper = lookup_one_len(dentry->d_name.name, upperdir,
704 err = PTR_ERR(upper);
709 if ((opaquedir && upper != opaquedir) ||
710 (!opaquedir && upper != ovl_dentry_upper(dentry)))
714 err = vfs_rmdir(dir, upper);
716 err = vfs_unlink(dir, upper, NULL);
717 ovl_dentry_version_inc(dentry->d_parent);
720 * Keeping this dentry hashed would mean having to release
721 * upperpath/lowerpath, which could only be done if we are the
722 * sole user of this dentry. Too tricky... Just unhash for
736 static int ovl_do_remove(struct dentry *dentry, bool is_dir)
738 enum ovl_path_type type;
740 const struct cred *old_cred;
742 err = ovl_want_write(dentry);
746 err = ovl_copy_up(dentry->d_parent);
750 type = ovl_path_type(dentry);
752 old_cred = ovl_override_creds(dentry->d_sb);
753 if (!ovl_lower_positive(dentry))
754 err = ovl_remove_upper(dentry, is_dir);
756 err = ovl_remove_and_whiteout(dentry, is_dir);
757 revert_creds(old_cred);
760 clear_nlink(dentry->d_inode);
762 drop_nlink(dentry->d_inode);
765 ovl_drop_write(dentry);
770 static int ovl_unlink(struct inode *dir, struct dentry *dentry)
772 return ovl_do_remove(dentry, false);
775 static int ovl_rmdir(struct inode *dir, struct dentry *dentry)
777 return ovl_do_remove(dentry, true);
780 static bool ovl_type_merge_or_lower(struct dentry *dentry)
782 enum ovl_path_type type = ovl_path_type(dentry);
784 return OVL_TYPE_MERGE(type) || !OVL_TYPE_UPPER(type);
787 static bool ovl_can_move(struct dentry *dentry)
789 return ovl_redirect_dir(dentry->d_sb) ||
790 !d_is_dir(dentry) || !ovl_type_merge_or_lower(dentry);
793 static char *ovl_get_redirect(struct dentry *dentry, bool samedir)
796 struct dentry *d, *tmp;
797 int buflen = ovl_redirect_max + 1;
800 ret = kstrndup(dentry->d_name.name, dentry->d_name.len,
805 buf = ret = kmalloc(buflen, GFP_TEMPORARY);
811 for (d = dget(dentry); !IS_ROOT(d);) {
815 spin_lock(&d->d_lock);
816 name = ovl_dentry_get_redirect(d);
818 thislen = strlen(name);
820 name = d->d_name.name;
821 thislen = d->d_name.len;
824 /* If path is too long, fall back to userspace move */
825 if (thislen + (name[0] != '/') > buflen) {
826 ret = ERR_PTR(-EXDEV);
827 spin_unlock(&d->d_lock);
832 memcpy(&buf[buflen], name, thislen);
833 tmp = dget_dlock(d->d_parent);
834 spin_unlock(&d->d_lock);
839 /* Absolute redirect: finished */
840 if (buf[buflen] == '/')
845 ret = kstrdup(&buf[buflen], GFP_KERNEL);
850 return ret ? ret : ERR_PTR(-ENOMEM);
853 static int ovl_set_redirect(struct dentry *dentry, bool samedir)
856 const char *redirect = ovl_dentry_get_redirect(dentry);
858 if (redirect && (samedir || redirect[0] == '/'))
861 redirect = ovl_get_redirect(dentry, samedir);
862 if (IS_ERR(redirect))
863 return PTR_ERR(redirect);
865 err = ovl_check_setxattr(dentry, ovl_dentry_upper(dentry),
867 redirect, strlen(redirect), -EXDEV);
869 spin_lock(&dentry->d_lock);
870 ovl_dentry_set_redirect(dentry, redirect);
871 spin_unlock(&dentry->d_lock);
874 pr_warn_ratelimited("overlay: failed to set redirect (%i)\n", err);
875 /* Fall back to userspace copy-up */
881 static int ovl_rename(struct inode *olddir, struct dentry *old,
882 struct inode *newdir, struct dentry *new,
886 struct dentry *old_upperdir;
887 struct dentry *new_upperdir;
888 struct dentry *olddentry;
889 struct dentry *newdentry;
893 bool cleanup_whiteout = false;
894 bool overwrite = !(flags & RENAME_EXCHANGE);
895 bool is_dir = d_is_dir(old);
896 bool new_is_dir = d_is_dir(new);
897 bool samedir = olddir == newdir;
898 struct dentry *opaquedir = NULL;
899 const struct cred *old_cred = NULL;
902 if (flags & ~(RENAME_EXCHANGE | RENAME_NOREPLACE))
905 flags &= ~RENAME_NOREPLACE;
907 /* Don't copy up directory trees */
909 if (!ovl_can_move(old))
911 if (!overwrite && !ovl_can_move(new))
914 err = ovl_want_write(old);
918 err = ovl_copy_up(old);
922 err = ovl_copy_up(new->d_parent);
926 err = ovl_copy_up(new);
931 old_cred = ovl_override_creds(old->d_sb);
933 if (overwrite && new_is_dir && ovl_type_merge_or_lower(new)) {
934 opaquedir = ovl_check_empty_and_clear(new);
935 err = PTR_ERR(opaquedir);
936 if (IS_ERR(opaquedir)) {
938 goto out_revert_creds;
943 if (ovl_lower_positive(old)) {
944 if (!ovl_dentry_is_whiteout(new)) {
945 /* Whiteout source */
946 flags |= RENAME_WHITEOUT;
948 /* Switch whiteouts */
949 flags |= RENAME_EXCHANGE;
951 } else if (is_dir && ovl_dentry_is_whiteout(new)) {
952 flags |= RENAME_EXCHANGE;
953 cleanup_whiteout = true;
957 old_upperdir = ovl_dentry_upper(old->d_parent);
958 new_upperdir = ovl_dentry_upper(new->d_parent);
962 * When moving a merge dir or non-dir with copy up origin into
963 * a new parent, we are marking the new parent dir "impure".
964 * When ovl_iterate() iterates an "impure" upper dir, it will
965 * lookup the origin inodes of the entries to fill d_ino.
967 if (ovl_type_origin(old)) {
968 err = ovl_set_impure(new->d_parent, new_upperdir);
970 goto out_revert_creds;
972 if (!overwrite && ovl_type_origin(new)) {
973 err = ovl_set_impure(old->d_parent, old_upperdir);
975 goto out_revert_creds;
979 trap = lock_rename(new_upperdir, old_upperdir);
981 olddentry = lookup_one_len(old->d_name.name, old_upperdir,
983 err = PTR_ERR(olddentry);
984 if (IS_ERR(olddentry))
988 if (olddentry != ovl_dentry_upper(old))
991 newdentry = lookup_one_len(new->d_name.name, new_upperdir,
993 err = PTR_ERR(newdentry);
994 if (IS_ERR(newdentry))
997 old_opaque = ovl_dentry_is_opaque(old);
998 new_opaque = ovl_dentry_is_opaque(new);
1001 if (ovl_dentry_upper(new)) {
1003 if (newdentry != opaquedir)
1006 if (newdentry != ovl_dentry_upper(new))
1010 if (!d_is_negative(newdentry) &&
1011 (!new_opaque || !ovl_is_whiteout(newdentry)))
1015 if (olddentry == trap)
1017 if (newdentry == trap)
1020 if (WARN_ON(olddentry->d_inode == newdentry->d_inode))
1025 if (ovl_type_merge_or_lower(old))
1026 err = ovl_set_redirect(old, samedir);
1027 else if (!old_opaque && ovl_type_merge(new->d_parent))
1028 err = ovl_set_opaque_xerr(old, olddentry, -EXDEV);
1032 if (!overwrite && new_is_dir) {
1033 if (ovl_type_merge_or_lower(new))
1034 err = ovl_set_redirect(new, samedir);
1035 else if (!new_opaque && ovl_type_merge(old->d_parent))
1036 err = ovl_set_opaque_xerr(new, newdentry, -EXDEV);
1041 err = ovl_do_rename(old_upperdir->d_inode, olddentry,
1042 new_upperdir->d_inode, newdentry, flags);
1046 if (cleanup_whiteout)
1047 ovl_cleanup(old_upperdir->d_inode, newdentry);
1049 ovl_dentry_version_inc(old->d_parent);
1050 ovl_dentry_version_inc(new->d_parent);
1057 unlock_rename(new_upperdir, old_upperdir);
1059 revert_creds(old_cred);
1061 ovl_drop_write(old);
1067 const struct inode_operations ovl_dir_inode_operations = {
1068 .lookup = ovl_lookup,
1070 .symlink = ovl_symlink,
1071 .unlink = ovl_unlink,
1073 .rename = ovl_rename,
1075 .setattr = ovl_setattr,
1076 .create = ovl_create,
1078 .permission = ovl_permission,
1079 .getattr = ovl_getattr,
1080 .listxattr = ovl_listxattr,
1081 .get_acl = ovl_get_acl,
1082 .update_time = ovl_update_time,