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1da177e4 LT |
1 | #ifndef _NAMESPACE_H_ |
2 | #define _NAMESPACE_H_ | |
3 | #ifdef __KERNEL__ | |
4 | ||
5 | #include <linux/mount.h> | |
6 | #include <linux/sched.h> | |
7 | ||
8 | struct namespace { | |
9 | atomic_t count; | |
10 | struct vfsmount * root; | |
11 | struct list_head list; | |
12 | struct rw_semaphore sem; | |
13 | }; | |
14 | ||
15 | extern void umount_tree(struct vfsmount *); | |
16 | extern int copy_namespace(int, struct task_struct *); | |
17 | extern void __put_namespace(struct namespace *namespace); | |
18 | ||
19 | static inline void put_namespace(struct namespace *namespace) | |
20 | { | |
21 | if (atomic_dec_and_test(&namespace->count)) | |
22 | __put_namespace(namespace); | |
23 | } | |
24 | ||
25 | static inline void exit_namespace(struct task_struct *p) | |
26 | { | |
27 | struct namespace *namespace = p->namespace; | |
28 | if (namespace) { | |
29 | task_lock(p); | |
30 | p->namespace = NULL; | |
31 | task_unlock(p); | |
32 | put_namespace(namespace); | |
33 | } | |
34 | } | |
35 | ||
36 | static inline void get_namespace(struct namespace *namespace) | |
37 | { | |
38 | atomic_inc(&namespace->count); | |
39 | } | |
40 | ||
41 | #endif | |
42 | #endif |