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acce292c CLG |
1 | #ifndef _LINUX_USER_NAMESPACE_H |
2 | #define _LINUX_USER_NAMESPACE_H | |
3 | ||
4 | #include <linux/kref.h> | |
5 | #include <linux/nsproxy.h> | |
6 | #include <linux/sched.h> | |
7 | ||
8 | #define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8) | |
9 | #define UIDHASH_SZ (1 << UIDHASH_BITS) | |
10 | ||
11 | struct user_namespace { | |
12 | struct kref kref; | |
13 | struct list_head uidhash_table[UIDHASH_SZ]; | |
14 | struct user_struct *root_user; | |
15 | }; | |
16 | ||
17 | extern struct user_namespace init_user_ns; | |
18 | ||
19 | #ifdef CONFIG_USER_NS | |
20 | ||
21 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
22 | { | |
23 | if (ns) | |
24 | kref_get(&ns->kref); | |
25 | return ns; | |
26 | } | |
27 | ||
28 | extern struct user_namespace *copy_user_ns(int flags, | |
29 | struct user_namespace *old_ns); | |
30 | extern void free_user_ns(struct kref *kref); | |
31 | ||
32 | static inline void put_user_ns(struct user_namespace *ns) | |
33 | { | |
34 | if (ns) | |
35 | kref_put(&ns->kref, free_user_ns); | |
36 | } | |
37 | ||
38 | #else | |
39 | ||
40 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
41 | { | |
42 | return &init_user_ns; | |
43 | } | |
44 | ||
45 | static inline struct user_namespace *copy_user_ns(int flags, | |
46 | struct user_namespace *old_ns) | |
47 | { | |
48 | return NULL; | |
49 | } | |
50 | ||
51 | static inline void put_user_ns(struct user_namespace *ns) | |
52 | { | |
53 | } | |
54 | ||
55 | #endif | |
56 | ||
57 | #endif /* _LINUX_USER_H */ |