include/linux/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
   8 struct namespace {
   9         atomic_t                count;
  10         struct vfsmount *       root;
  11         struct list_head        list;
  12         wait_queue_head_t poll;
  13         int event;
  14 };
  15
  16 extern int copy_namespace(int, struct task_struct *);
  17 extern void __put_namespace(struct namespace *namespace);
  18
  19 static inline void put_namespace(struct namespace *namespace)
  20 {
  21         if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
  22                 /* releases vfsmount_lock */
  23                 __put_namespace(namespace);
  24 }
  25
  26 static inline void exit_namespace(struct task_struct *p)
  27 {
  28         struct namespace *namespace = p->namespace;
  29         if (namespace) {
  30                 task_lock(p);
  31                 p->namespace = NULL;
  32                 task_unlock(p);
  33                 put_namespace(namespace);
  34         }
  35 }
  36
  37 static inline void get_namespace(struct namespace *namespace)
  38 {
  39         atomic_inc(&namespace->count);
  40 }
  41
  42 #endif
  43 #endif