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- #ifndef _NAMESPACE_H_
- #define _NAMESPACE_H_
- #ifdef __KERNEL__
-
- #include <linux/mount.h>
- #include <linux/sched.h>
-
- struct namespace {
- atomic_t count;
- struct vfsmount * root;
- struct list_head list;
- struct rw_semaphore sem;
- };
-
- extern void umount_tree(struct vfsmount *);
- extern int copy_namespace(int, struct task_struct *);
- extern void __put_namespace(struct namespace *namespace);
-
- static inline void put_namespace(struct namespace *namespace)
- {
- if (atomic_dec_and_test(&namespace->count))
- __put_namespace(namespace);
- }
-
- static inline void exit_namespace(struct task_struct *p)
- {
- struct namespace *namespace = p->namespace;
- if (namespace) {
- task_lock(p);
- p->namespace = NULL;
- task_unlock(p);
- put_namespace(namespace);
- }
- }
-
- static inline void get_namespace(struct namespace *namespace)
- {
- atomic_inc(&namespace->count);
- }
-
- #endif
- #endif
-