xref: /linux-6.15/include/linux/mnt_namespace.h (revision e73173db)
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
56