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61a58c6c SB |
1 | #ifndef _LINUX_PID_NS_H |
2 | #define _LINUX_PID_NS_H | |
aa5a6662 SB |
3 | |
4 | #include <linux/sched.h> | |
5 | #include <linux/mm.h> | |
6 | #include <linux/threads.h> | |
7 | #include <linux/pid.h> | |
9a575a92 CLG |
8 | #include <linux/nsproxy.h> |
9 | #include <linux/kref.h> | |
aa5a6662 SB |
10 | |
11 | struct pidmap { | |
12 | atomic_t nr_free; | |
13 | void *page; | |
14 | }; | |
15 | ||
16 | #define PIDMAP_ENTRIES ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8) | |
17 | ||
61a58c6c | 18 | struct pid_namespace { |
9a575a92 CLG |
19 | struct kref kref; |
20 | struct pidmap pidmap[PIDMAP_ENTRIES]; | |
21 | int last_pid; | |
84d73786 | 22 | struct task_struct *child_reaper; |
baf8f0f8 | 23 | struct kmem_cache *pid_cachep; |
3fbc9648 SB |
24 | }; |
25 | ||
61a58c6c | 26 | extern struct pid_namespace init_pid_ns; |
3fbc9648 | 27 | |
a05f7b15 | 28 | static inline struct pid_namespace *get_pid_ns(struct pid_namespace *ns) |
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29 | { |
30 | kref_get(&ns->kref); | |
a05f7b15 | 31 | return ns; |
9a575a92 CLG |
32 | } |
33 | ||
213dd266 | 34 | extern struct pid_namespace *copy_pid_ns(unsigned long flags, struct pid_namespace *ns); |
9a575a92 CLG |
35 | extern void free_pid_ns(struct kref *kref); |
36 | ||
37 | static inline void put_pid_ns(struct pid_namespace *ns) | |
38 | { | |
39 | kref_put(&ns->kref, free_pid_ns); | |
40 | } | |
41 | ||
84d73786 SB |
42 | static inline struct task_struct *child_reaper(struct task_struct *tsk) |
43 | { | |
0f245285 | 44 | return init_pid_ns.child_reaper; |
84d73786 SB |
45 | } |
46 | ||
61a58c6c | 47 | #endif /* _LINUX_PID_NS_H */ |