mnt_namespace.h 861 B

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  1. #ifndef _NAMESPACE_H_
  2. #define _NAMESPACE_H_
  3. #ifdef __KERNEL__
  4. #include <linux/mount.h>
  5. #include <linux/sched.h>
  6. #include <linux/nsproxy.h>
  7. struct mnt_namespace {
  8. atomic_t count;
  9. struct vfsmount * root;
  10. struct list_head list;
  11. wait_queue_head_t poll;
  12. int event;
  13. };
  14. extern int copy_mnt_ns(int, struct task_struct *);
  15. extern void __put_mnt_ns(struct mnt_namespace *ns);
  16. extern struct mnt_namespace *dup_mnt_ns(struct task_struct *,
  17. struct fs_struct *);
  18. static inline void put_mnt_ns(struct mnt_namespace *ns)
  19. {
  20. if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
  21. /* releases vfsmount_lock */
  22. __put_mnt_ns(ns);
  23. }
  24. static inline void exit_mnt_ns(struct task_struct *p)
  25. {
  26. struct mnt_namespace *ns = p->nsproxy->mnt_ns;
  27. if (ns)
  28. put_mnt_ns(ns);
  29. }
  30. static inline void get_mnt_ns(struct mnt_namespace *ns)
  31. {
  32. atomic_inc(&ns->count);
  33. }
  34. #endif
  35. #endif