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David Howells0bb80f22013-04-12 01:50:06 +01001/*
2 * procfs namespace bits
3 */
4#ifndef _LINUX_PROC_NS_H
5#define _LINUX_PROC_NS_H
6
Al Viroe149ed22014-11-01 10:57:28 -04007#include <linux/ns_common.h>
8
David Howells0bb80f22013-04-12 01:50:06 +01009struct pid_namespace;
10struct nsproxy;
Al Viroe149ed22014-11-01 10:57:28 -040011struct path;
David Howells0bb80f22013-04-12 01:50:06 +010012
13struct proc_ns_operations {
14 const char *name;
15 int type;
Al Viro64964522014-11-01 00:37:32 -040016 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);
David Howells0bb80f22013-04-12 01:50:06 +010019};
20
David Howells0bb80f22013-04-12 01:50:06 +010021extern 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);
David Howells0bb80f22013-04-12 01:50:06 +010043extern int proc_alloc_inum(unsigned int *pino);
44extern void proc_free_inum(unsigned int inum);
David Howells0bb80f22013-04-12 01:50:06 +010045
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
David Howells0bb80f22013-04-12 01:50:06 +010051static 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) {}
David Howells0bb80f22013-04-12 01:50:06 +010057
58#endif /* CONFIG_PROC_FS */
59
Al Viroe149ed22014-11-01 10:57:28 -040060static 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
Al Viro6344c432014-11-01 00:45:45 -040066#define ns_free_inum(ns) proc_free_inum((ns)->inum)
67
Al Viroe149ed22014-11-01 10:57:28 -040068extern 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
David Howells0bb80f22013-04-12 01:50:06 +010077#endif /* _LINUX_PROC_NS_H */