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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 | 8 | |
6164281a | 9 | #define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 7) |
acce292c CLG |
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 | ||
5c1469de EB |
39 | uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid); |
40 | gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid); | |
41 | ||
acce292c CLG |
42 | #else |
43 | ||
44 | static inline struct user_namespace *get_user_ns(struct user_namespace *ns) | |
45 | { | |
46 | return &init_user_ns; | |
47 | } | |
48 | ||
18b6e041 | 49 | static inline int create_user_ns(struct cred *new) |
acce292c | 50 | { |
18b6e041 | 51 | return -EINVAL; |
acce292c CLG |
52 | } |
53 | ||
54 | static inline void put_user_ns(struct user_namespace *ns) | |
55 | { | |
56 | } | |
57 | ||
5c1469de EB |
58 | static inline uid_t user_ns_map_uid(struct user_namespace *to, |
59 | const struct cred *cred, uid_t uid) | |
60 | { | |
61 | return uid; | |
62 | } | |
63 | static inline gid_t user_ns_map_gid(struct user_namespace *to, | |
64 | const struct cred *cred, gid_t gid) | |
65 | { | |
66 | return gid; | |
67 | } | |
68 | ||
acce292c CLG |
69 | #endif |
70 | ||
71 | #endif /* _LINUX_USER_H */ |