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
9 struct pid_namespace;
10 struct nsproxy;
11 struct path;
12
13 struct 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
21 extern const struct proc_ns_operations netns_operations;
22 extern const struct proc_ns_operations utsns_operations;
23 extern const struct proc_ns_operations ipcns_operations;
24 extern const struct proc_ns_operations pidns_operations;
25 extern const struct proc_ns_operations userns_operations;
26 extern const struct proc_ns_operations mntns_operations;
27
28 /*
29 * We always define these enumerators
30 */
31 enum {
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
41 extern int pid_ns_prepare_proc(struct pid_namespace *ns);
42 extern void pid_ns_release_proc(struct pid_namespace *ns);
43 extern int proc_alloc_inum(unsigned int *pino);
44 extern void proc_free_inum(unsigned int inum);
45
46 #else /* CONFIG_PROC_FS */
47
pid_ns_prepare_proc(struct pid_namespace * ns)48 static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
pid_ns_release_proc(struct pid_namespace * ns)49 static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
50
proc_alloc_inum(unsigned int * inum)51 static inline int proc_alloc_inum(unsigned int *inum)
52 {
53 *inum = 1;
54 return 0;
55 }
proc_free_inum(unsigned int inum)56 static inline void proc_free_inum(unsigned int inum) {}
57
58 #endif /* CONFIG_PROC_FS */
59
ns_alloc_inum(struct ns_common * ns)60 static 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
68 extern struct file *proc_ns_fget(int fd);
69 #define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
70 extern void *ns_get_path(struct path *path, struct task_struct *task,
71 const struct proc_ns_operations *ns_ops);
72
73 extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
74 const struct proc_ns_operations *ns_ops);
75 extern void nsfs_init(void);
76
77 #endif /* _LINUX_PROC_NS_H */
78