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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> | |
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]; |
acce292c CLG |
15 | struct user_struct *root_user; |
16 | }; | |
17 | ||
18 | extern struct user_namespace init_user_ns; | |
19 | ||
20 | #ifdef CONFIG_USER_NS | |
21 | ||
22 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
23 | { | |
24 | if (ns) | |
25 | kref_get(&ns->kref); | |
26 | return ns; | |
27 | } | |
28 | ||
29 | extern struct user_namespace *copy_user_ns(int flags, | |
30 | struct user_namespace *old_ns); | |
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 | ||
46 | static inline struct user_namespace *copy_user_ns(int flags, | |
47 | struct user_namespace *old_ns) | |
48 | { | |
77ec739d SH |
49 | if (flags & CLONE_NEWUSER) |
50 | return ERR_PTR(-EINVAL); | |
51 | ||
626ac545 | 52 | return old_ns; |
acce292c CLG |
53 | } |
54 | ||
55 | static inline void put_user_ns(struct user_namespace *ns) | |
56 | { | |
57 | } | |
58 | ||
59 | #endif | |
60 | ||
61 | #endif /* _LINUX_USER_H */ |