LXR linux/include/linux/mnt

   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#include <linux/seq_file.h>
   9
  10struct mnt_namespace {
  11        atomic_t                count;
  12        struct vfsmount *       root;
  13        struct list_head        list;
  14        wait_queue_head_t poll;
  15        int event;
  16};
  17
  18struct proc_mounts {
  19        struct seq_file m; /* must be the first element */
  20        struct mnt_namespace *ns;
  21        struct path root;
  22        int event;
  23};
  24
  25extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
  26                struct fs_struct *);
  27extern void __put_mnt_ns(struct mnt_namespace *ns);
  28
  29static inline void put_mnt_ns(struct mnt_namespace *ns)
  30{
  31        if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
  32                /* releases vfsmount_lock */
  33                __put_mnt_ns(ns);
  34}
  35
  36static inline void exit_mnt_ns(struct task_struct *p)
  37{
  38        struct mnt_namespace *ns = p->nsproxy->mnt_ns;
  39        if (ns)
  40                put_mnt_ns(ns);
  41}
  42
  43static inline void get_mnt_ns(struct mnt_namespace *ns)
  44{
  45        atomic_inc(&ns->count);
  46}
  47
  48extern const struct seq_operations mounts_op;
  49extern const struct seq_operations mountinfo_op;
  50extern const struct seq_operations mountstats_op;
  51
  52#endif
  53#endif
  54