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Commit | Line | Data |
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bbb1e54d MS |
1 | /* |
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 | ||
11 | struct ovl_config { | |
12 | char *lowerdir; | |
13 | char *upperdir; | |
14 | char *workdir; | |
15 | bool default_permissions; | |
a6c60655 | 16 | bool redirect_dir; |
02bcd157 | 17 | bool index; |
bbb1e54d MS |
18 | }; |
19 | ||
20 | /* private information held for overlayfs's superblock */ | |
21 | struct ovl_fs { | |
22 | struct vfsmount *upper_mnt; | |
23 | unsigned numlower; | |
24 | struct vfsmount **lower_mnt; | |
2cac0c00 AG |
25 | /* workbasedir is the path at workdir= mount option */ |
26 | struct dentry *workbasedir; | |
27 | /* workdir is the 'work' directory under workbasedir */ | |
bbb1e54d | 28 | struct dentry *workdir; |
02bcd157 AG |
29 | /* index directory listing overlay inodes by origin file handle */ |
30 | struct dentry *indexdir; | |
6b2d5fe4 | 31 | long namelen; |
bbb1e54d MS |
32 | /* pathnames of lower and upper dirs, for show_options */ |
33 | struct ovl_config config; | |
34 | /* creds of process who forced instantiation of super block */ | |
35 | const struct cred *creator_cred; | |
e7f52429 | 36 | bool tmpfile; |
82b749b2 | 37 | bool noxattr; |
7bcd74b9 AG |
38 | /* sb common to all layers */ |
39 | struct super_block *same_sb; | |
bbb1e54d MS |
40 | }; |
41 | ||
42 | /* private information held for every overlayfs dentry */ | |
43 | struct ovl_entry { | |
bbb1e54d | 44 | union { |
04a01ac7 | 45 | bool opaque; |
bbb1e54d MS |
46 | struct rcu_head rcu; |
47 | }; | |
48 | unsigned numlower; | |
49 | struct path lowerstack[]; | |
50 | }; | |
51 | ||
52 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); | |
53 | ||
13cf199d | 54 | struct ovl_inode { |
04a01ac7 | 55 | struct ovl_dir_cache *cache; |
cf31c463 | 56 | const char *redirect; |
04a01ac7 | 57 | u64 version; |
13c72075 | 58 | unsigned long flags; |
13cf199d | 59 | struct inode vfs_inode; |
09d8b586 | 60 | struct dentry *__upperdentry; |
25b7713a | 61 | struct inode *lower; |
a015dafc AG |
62 | |
63 | /* synchronize copy up and more */ | |
64 | struct mutex lock; | |
13cf199d AG |
65 | }; |
66 | ||
67 | static inline struct ovl_inode *OVL_I(struct inode *inode) | |
68 | { | |
69 | return container_of(inode, struct ovl_inode, vfs_inode); | |
70 | } | |
09d8b586 MS |
71 | |
72 | static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi) | |
73 | { | |
74 | return lockless_dereference(oi->__upperdentry); | |
75 | } |