summaryrefslogtreecommitdiff
path: root/include/linux/pid_namespace.h
blob: 76e7c6b2cf3304e003f7002597d7d6627c7a7f9c (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
#ifndef _LINUX_PID_NS_H
#define _LINUX_PID_NS_H

#include <linux/sched.h>
#include <linux/mm.h>
#include <linux/threads.h>
#include <linux/pid.h>
#include <linux/nsproxy.h>
#include <linux/kref.h>

struct pidmap {
       atomic_t nr_free;
       void *page;
};

#define PIDMAP_ENTRIES         ((PID_MAX_LIMIT + 8*PAGE_SIZE - 1)/PAGE_SIZE/8)

struct pid_namespace {
	struct kref kref;
	struct pidmap pidmap[PIDMAP_ENTRIES];
	int last_pid;
};

extern struct pid_namespace init_pid_ns;

static inline void get_pid_ns(struct pid_namespace *ns)
{
	kref_get(&ns->kref);
}

extern int copy_pid_ns(int flags, struct task_struct *tsk);
extern void free_pid_ns(struct kref *kref);

static inline void put_pid_ns(struct pid_namespace *ns)
{
	kref_put(&ns->kref, free_pid_ns);
}

#endif /* _LINUX_PID_NS_H */