1/*
2 * procfs namespace bits
3 */
4#ifndef _LINUX_PROC_NS_H
5#define _LINUX_PROC_NS_H
6
7#include <linux/ns_common.h>
8
9struct pid_namespace;
10struct nsproxy;
11struct path;
12
13struct proc_ns_operations {
14	const char *name;
15	int type;
16	struct ns_common *(*get)(struct task_struct *task);
17	void (*put)(struct ns_common *ns);
18	int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
19};
20
21extern const struct proc_ns_operations netns_operations;
22extern const struct proc_ns_operations utsns_operations;
23extern const struct proc_ns_operations ipcns_operations;
24extern const struct proc_ns_operations pidns_operations;
25extern const struct proc_ns_operations userns_operations;
26extern const struct proc_ns_operations mntns_operations;
27
28/*
29 * We always define these enumerators
30 */
31enum {
32	PROC_ROOT_INO		= 1,
33	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,
34	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,
35	PROC_USER_INIT_INO	= 0xEFFFFFFDU,
36	PROC_PID_INIT_INO	= 0xEFFFFFFCU,
37};
38
39#ifdef CONFIG_PROC_FS
40
41extern int pid_ns_prepare_proc(struct pid_namespace *ns);
42extern void pid_ns_release_proc(struct pid_namespace *ns);
43extern int proc_alloc_inum(unsigned int *pino);
44extern void proc_free_inum(unsigned int inum);
45
46#else /* CONFIG_PROC_FS */
47
48static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
49static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
50
51static inline int proc_alloc_inum(unsigned int *inum)
52{
53	*inum = 1;
54	return 0;
55}
56static inline void proc_free_inum(unsigned int inum) {}
57
58#endif /* CONFIG_PROC_FS */
59
60static inline int ns_alloc_inum(struct ns_common *ns)
61{
62	atomic_long_set(&ns->stashed, 0);
63	return proc_alloc_inum(&ns->inum);
64}
65
66#define ns_free_inum(ns) proc_free_inum((ns)->inum)
67
68extern struct file *proc_ns_fget(int fd);
69#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
70extern void *ns_get_path(struct path *path, struct task_struct *task,
71			const struct proc_ns_operations *ns_ops);
72
73extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
74			const struct proc_ns_operations *ns_ops);
75extern void nsfs_init(void);
76
77#endif /* _LINUX_PROC_NS_H */
78