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 extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
  19
  20 static inline void put_namespace(struct namespace *namespace)
  21 {
  22         if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
  23                 /* releases vfsmount_lock */
  24                 __put_namespace(namespace);
  25 }
  26
  27 static inline void exit_namespace(struct task_struct *p)
  28 {
  29         struct namespace *namespace = p->namespace;
  30         if (namespace) {
  31                 task_lock(p);
  32                 p->namespace = NULL;
  33                 task_unlock(p);
  34                 put_namespace(namespace);
  35         }
  36 }
  37
  38 static inline void get_namespace(struct namespace *namespace)
  39 {
  40         atomic_inc(&namespace->count);
  41 }
  42
  43 #endif
  44 #endif