1#ifndef _NAMESPACE_H_
2#define _NAMESPACE_H_
3#ifdef __KERNEL__
4
5#include <linux/mount.h>
6#include <linux/sched.h>
7#include <linux/nsproxy.h>
8
9struct mnt_namespace {
10	atomic_t		count;
11	struct vfsmount *	root;
12	struct list_head	list;
13	wait_queue_head_t poll;
14	int event;
15};
16
17extern struct mnt_namespace *copy_mnt_ns(int, struct mnt_namespace *,
18		struct fs_struct *);
19extern void __put_mnt_ns(struct mnt_namespace *ns);
20
21static inline void put_mnt_ns(struct mnt_namespace *ns)
22{
23	if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
24		/* releases vfsmount_lock */
25		__put_mnt_ns(ns);
26}
27
28static inline void exit_mnt_ns(struct task_struct *p)
29{
30	struct mnt_namespace *ns = p->nsproxy->mnt_ns;
31	if (ns)
32		put_mnt_ns(ns);
33}
34
35static inline void get_mnt_ns(struct mnt_namespace *ns)
36{
37	atomic_inc(&ns->count);
38}
39
40#endif
41#endif
42