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Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -08001#ifndef _LINUX_PID_NS_H
2#define _LINUX_PID_NS_H
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -07003
4#include <linux/sched.h>
5#include <linux/mm.h>
6#include <linux/threads.h>
7#include <linux/pid.h>
Cedric Le Goater9a575a92006-12-08 02:37:59 -08008#include <linux/nsproxy.h>
9#include <linux/kref.h>
Sukadev Bhattiproluaa5a6662006-10-02 02:17:23 -070010
11struct 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
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080018struct pid_namespace {
Cedric Le Goater9a575a92006-12-08 02:37:59 -080019 struct kref kref;
20 struct pidmap pidmap[PIDMAP_ENTRIES];
21 int last_pid;
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080022 struct task_struct *child_reaper;
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -070023};
24
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080025extern struct pid_namespace init_pid_ns;
Sukadev Bhattiprolu3fbc9642006-10-02 02:17:24 -070026
Cedric Le Goater9a575a92006-12-08 02:37:59 -080027static inline void get_pid_ns(struct pid_namespace *ns)
28{
29 kref_get(&ns->kref);
30}
31
Badari Pulavartye3222c42007-05-08 00:25:21 -070032extern struct pid_namespace *copy_pid_ns(int flags, struct pid_namespace *ns);
Cedric Le Goater9a575a92006-12-08 02:37:59 -080033extern void free_pid_ns(struct kref *kref);
34
35static inline void put_pid_ns(struct pid_namespace *ns)
36{
37 kref_put(&ns->kref, free_pid_ns);
38}
39
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080040static inline struct task_struct *child_reaper(struct task_struct *tsk)
41{
Serge E. Hallyn0f245282007-01-30 15:28:23 -060042 return init_pid_ns.child_reaper;
Sukadev Bhattiprolu84d73782006-12-08 02:38:01 -080043}
44
Sukadev Bhattiprolu61a58c62006-12-08 02:37:58 -080045#endif /* _LINUX_PID_NS_H */