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         struct rw_semaphore     sem;
  13 };
  14
  15 extern int copy_namespace(int, struct task_struct *);
  16 extern void __put_namespace(struct namespace *namespace);
  17
  18 static inline void put_namespace(struct namespace *namespace)
  19 {
  20         if (atomic_dec_and_test(&namespace->count))
  21                 __put_namespace(namespace);
  22 }
  23
  24 static inline void exit_namespace(struct task_struct *p)
  25 {
  26         struct namespace *namespace = p->namespace;
  27         if (namespace) {
  28                 task_lock(p);
  29                 p->namespace = NULL;
  30                 task_unlock(p);
  31                 put_namespace(namespace);
  32         }
  33 }
  34
  35 static inline void get_namespace(struct namespace *namespace)
  36 {
  37         atomic_inc(&namespace->count);
  38 }
  39
  40 #endif
  41 #endif