include/linux/mnt_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 #include <linux/seq_file.h>
   9
  10 struct mnt_namespace {
  11         atomic_t                count;
  12         struct vfsmount *       root;
  13         struct list_head        list;
  14         wait_queue_head_t poll;
  15         int event;
  16 };
  17
  18 struct proc_mounts {
  19         struct seq_file m; /* must be the first element */
  20         struct mnt_namespace *ns;
  21         struct path root;
  22         int event;
  23 };
  24
  25 struct fs_struct;
  26
  27 extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
  28                 struct fs_struct *);
  29 extern void __put_mnt_ns(struct mnt_namespace *ns);
  30
  31 static inline void put_mnt_ns(struct mnt_namespace *ns)
  32 {
  33         if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
  34                 /* releases vfsmount_lock */
  35                 __put_mnt_ns(ns);
  36 }
  37
  38 static inline void exit_mnt_ns(struct task_struct *p)
  39 {
  40         struct mnt_namespace *ns = p->nsproxy->mnt_ns;
  41         if (ns)
  42                 put_mnt_ns(ns);
  43 }
  44
  45 static inline void get_mnt_ns(struct mnt_namespace *ns)
  46 {
  47         atomic_inc(&ns->count);
  48 }
  49
  50 extern const struct seq_operations mounts_op;
  51 extern const struct seq_operations mountinfo_op;
  52 extern const struct seq_operations mountstats_op;
  53
  54 #endif
  55 #endif