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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; | |
85fdee1e AG |
40 | /* Did we take the inuse lock? */ |
41 | bool upperdir_locked; | |
42 | bool workdir_locked; | |
bbb1e54d MS |
43 | }; |
44 | ||
45 | /* private information held for every overlayfs dentry */ | |
46 | struct ovl_entry { | |
bbb1e54d | 47 | union { |
55acc661 MS |
48 | struct { |
49 | unsigned long has_upper; | |
50 | bool opaque; | |
51 | }; | |
bbb1e54d MS |
52 | struct rcu_head rcu; |
53 | }; | |
54 | unsigned numlower; | |
55 | struct path lowerstack[]; | |
56 | }; | |
57 | ||
58 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); | |
59 | ||
13cf199d | 60 | struct ovl_inode { |
04a01ac7 | 61 | struct ovl_dir_cache *cache; |
cf31c463 | 62 | const char *redirect; |
04a01ac7 | 63 | u64 version; |
13c72075 | 64 | unsigned long flags; |
13cf199d | 65 | struct inode vfs_inode; |
09d8b586 | 66 | struct dentry *__upperdentry; |
25b7713a | 67 | struct inode *lower; |
a015dafc AG |
68 | |
69 | /* synchronize copy up and more */ | |
70 | struct mutex lock; | |
13cf199d AG |
71 | }; |
72 | ||
73 | static inline struct ovl_inode *OVL_I(struct inode *inode) | |
74 | { | |
75 | return container_of(inode, struct ovl_inode, vfs_inode); | |
76 | } | |
09d8b586 MS |
77 | |
78 | static inline struct dentry *ovl_upperdentry_dereference(struct ovl_inode *oi) | |
79 | { | |
3382290e | 80 | return READ_ONCE(oi->__upperdentry); |
09d8b586 | 81 | } |