include/linux/mnt_namespace.h

   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
   9 struct 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
  17 extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
  18                 struct fs_struct *);
  19 extern void __put_mnt_ns(struct mnt_namespace *ns);
  20
  21 static 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
  28 static 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
  35 static inline void get_mnt_ns(struct mnt_namespace *ns)
  36 {
  37         atomic_inc(&ns->count);
  38 }
  39
  40 #endif
  41 #endif