Commit | Line | Data |
---|---|---|
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> | |
77ec739d | 7 | #include <linux/err.h> |
acce292c CLG |
8 | |
9 | #define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8) | |
10 | #define UIDHASH_SZ (1 << UIDHASH_BITS) | |
11 | ||
12 | struct user_namespace { | |
13 | struct kref kref; | |
735de223 | 14 | struct hlist_head uidhash_table[UIDHASH_SZ]; |
18b6e041 | 15 | struct user_struct *creator; |
51708366 | 16 | struct work_struct destroyer; |
acce292c CLG |
17 | }; |
18 | ||
19 | extern struct user_namespace init_user_ns; | |
20 | ||
21 | #ifdef CONFIG_USER_NS | |
22 | ||
23 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
24 | { | |
25 | if (ns) | |
26 | kref_get(&ns->kref); | |
27 | return ns; | |
28 | } | |
29 | ||
18b6e041 | 30 | extern int create_user_ns(struct cred *new); |
acce292c CLG |
31 | extern void free_user_ns(struct kref *kref); |
32 | ||
33 | static inline void put_user_ns(struct user_namespace *ns) | |
34 | { | |
35 | if (ns) | |
36 | kref_put(&ns->kref, free_user_ns); | |
37 | } | |
38 | ||
39 | #else | |
40 | ||
41 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
42 | { | |
43 | return &init_user_ns; | |
44 | } | |
45 | ||
18b6e041 | 46 | static inline int create_user_ns(struct cred *new) |
acce292c | 47 | { |
18b6e041 | 48 | return -EINVAL; |
acce292c CLG |
49 | } |
50 | ||
51 | static inline void put_user_ns(struct user_namespace *ns) | |
52 | { | |
53 | } | |
54 | ||
55 | #endif | |
56 | ||
57 | #endif /* _LINUX_USER_H */ |