projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 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; | |
| 16 | }; | |
| 17 | ||
| 18 | /* private information held for overlayfs's superblock */ | |
| 19 | struct ovl_fs { | |
| 20 | struct vfsmount *upper_mnt; | |
| 21 | unsigned numlower; | |
| 22 | struct vfsmount **lower_mnt; | |
| 23 | struct dentry *workdir; | |
| 6b2d5fe4 | 24 | long namelen; |
| bbb1e54d MS |
25 | /* 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 */ | |
| 32 | struct ovl_entry { | |
| 33 | struct dentry *__upperdentry; | |
| 34 | struct ovl_dir_cache *cache; | |
| 35 | union { | |
| 36 | struct { | |
| 37 | u64 version; | |
| 02b69b28 | 38 | const char *redirect; |
| bbb1e54d MS |
39 | bool opaque; |
| 40 | }; | |
| 41 | struct rcu_head rcu; | |
| 42 | }; | |
| 43 | unsigned numlower; | |
| 44 | struct path lowerstack[]; | |
| 45 | }; | |
| 46 | ||
| 47 | struct ovl_entry *ovl_alloc_entry(unsigned int numlower); | |
| 48 | ||
| 49 | static inline struct dentry *ovl_upperdentry_dereference(struct ovl_entry *oe) | |
| 50 | { | |
| 51 | return lockless_dereference(oe->__upperdentry); | |
| 52 | } |