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 #include <linux/nsproxy.h>
   8
   9 struct 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 int copy_namespace(int, struct task_struct *);
  18 extern void __put_namespace(struct namespace *namespace);
  19 extern struct namespace *dup_namespace(struct task_struct *, struct fs_struct *);
  20
  21 static inline void put_namespace(struct namespace *namespace)
  22 {
  23         if (atomic_dec_and_lock(&namespace->count, &vfsmount_lock))
  24                 /* releases vfsmount_lock */
  25                 __put_namespace(namespace);
  26 }
  27
  28 static inline void exit_namespace(struct task_struct *p)
  29 {
  30         struct namespace *namespace = p->nsproxy->namespace;
  31         if (namespace) {
  32                 put_namespace(namespace);
  33         }
  34 }
  35
  36 static inline void get_namespace(struct namespace *namespace)
  37 {
  38         atomic_inc(&namespace->count);
  39 }
  40
  41 #endif
  42 #endif