git://bbs.cooldavid.org / net-next-2.6.git / blame
| 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 */ |