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 mnt_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 struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *, 18 struct fs_struct *); 19 extern void __put_mnt_ns(struct mnt_namespace *ns); 20 21 static inline void put_mnt_ns(struct mnt_namespace *ns) 22 { 23 if (atomic_dec_and_lock(&ns->count, &vfsmount_lock)) 24 /* releases vfsmount_lock */ 25 __put_mnt_ns(ns); 26 } 27 28 static inline void exit_mnt_ns(struct task_struct *p) 29 { 30 struct mnt_namespace *ns = p->nsproxy->mnt_ns; 31 if (ns) 32 put_mnt_ns(ns); 33 } 34 35 static inline void get_mnt_ns(struct mnt_namespace *ns) 36 { 37 atomic_inc(&ns->count); 38 } 39 40 #endif 41 #endif 42