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 extern struct mnt_namespace *copy_mnt_ns(unsigned long, struct mnt_namespace *,
  26                 struct fs_struct *);
  27 extern void __put_mnt_ns(struct mnt_namespace *ns);
  28
  29 static inline void put_mnt_ns(struct mnt_namespace *ns)
  30 {
  31         if (atomic_dec_and_lock(&ns->count, &vfsmount_lock))
  32                 /* releases vfsmount_lock */
  33                 __put_mnt_ns(ns);
  34 }
  35
  36 static inline void exit_mnt_ns(struct task_struct *p)
  37 {
  38         struct mnt_namespace *ns = p->nsproxy->mnt_ns;
  39         if (ns)
  40                 put_mnt_ns(ns);
  41 }
  42
  43 static inline void get_mnt_ns(struct mnt_namespace *ns)
  44 {
  45         atomic_inc(&ns->count);
  46 }
  47
  48 extern const struct seq_operations mounts_op;
  49 extern const struct seq_operations mountinfo_op;
  50 extern const struct seq_operations mountstats_op;
  51
  52 #endif
  53 #endif