blob: b10745edfc9361256bc988baf26d591ae9f8495c [file] [log] [blame]
Miklos Szeredibbb1e542016-12-16 11:02:56 +01001/*
2 *
3 * Copyright (C) 2011 Novell Inc.
4 * Copyright (C) 2016 Red Hat, Inc.
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published by
8 * the Free Software Foundation.
9 */
10
11struct ovl_config {
12 char *lowerdir;
13 char *upperdir;
14 char *workdir;
15 bool default_permissions;
16};
17
18/* private information held for overlayfs's superblock */
19struct ovl_fs {
20 struct vfsmount *upper_mnt;
21 unsigned numlower;
22 struct vfsmount **lower_mnt;
23 struct dentry *workdir;
Miklos Szeredi6b2d5fe2016-12-16 11:02:56 +010024 long namelen;
Miklos Szeredibbb1e542016-12-16 11:02:56 +010025 /* pathnames of lower and upper dirs, for show_options */
26 struct ovl_config config;
27 /* creds of process who forced instantiation of super block */
28 const struct cred *creator_cred;
29};
30
31/* private information held for every overlayfs dentry */
32struct ovl_entry {
33 struct dentry *__upperdentry;
34 struct ovl_dir_cache *cache;
35 union {
36 struct {
37 u64 version;
38 bool opaque;
39 };
40 struct rcu_head rcu;
41 };
42 unsigned numlower;
43 struct path lowerstack[];
44};
45
46struct ovl_entry *ovl_alloc_entry(unsigned int numlower);
47
48static inline struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe)
49{
50 return lockless_dereference(oe->__upperdentry);
51}