[mirror_ubuntu-artful-kernel.git] / include / linux / proc_ns.h

/*
 * procfs namespace bits
 */
#ifndef _LINUX_PROC_NS_H
#define _LINUX_PROC_NS_H

#include <linux/ns_common.h>

struct pid_namespace;
struct nsproxy;
struct path;
struct task_struct;
struct inode;

struct proc_ns_operations {
	const char *name;
	const char *real_ns_name;
	int type;
	struct ns_common *(*get)(struct task_struct *task);
	void (*put)(struct ns_common *ns);
	int (*install)(struct nsproxy *nsproxy, struct ns_common *ns);
	struct user_namespace *(*owner)(struct ns_common *ns);
	struct ns_common *(*get_parent)(struct ns_common *ns);
} __randomize_layout;

extern const struct proc_ns_operations netns_operations;
extern const struct proc_ns_operations utsns_operations;
extern const struct proc_ns_operations ipcns_operations;
extern const struct proc_ns_operations pidns_operations;
extern const struct proc_ns_operations pidns_for_children_operations;
extern const struct proc_ns_operations userns_operations;
extern const struct proc_ns_operations mntns_operations;
extern const struct proc_ns_operations cgroupns_operations;

/*
 * We always define these enumerators
 */
enum {
	PROC_ROOT_INO		= 1,
	PROC_IPC_INIT_INO	= 0xEFFFFFFFU,
	PROC_UTS_INIT_INO	= 0xEFFFFFFEU,
	PROC_USER_INIT_INO	= 0xEFFFFFFDU,
	PROC_PID_INIT_INO	= 0xEFFFFFFCU,
	PROC_CGROUP_INIT_INO	= 0xEFFFFFFBU,
};

#ifdef CONFIG_PROC_FS

extern int pid_ns_prepare_proc(struct pid_namespace *ns);
extern void pid_ns_release_proc(struct pid_namespace *ns);
extern int proc_alloc_inum(unsigned int *pino);
extern void proc_free_inum(unsigned int inum);

#else /* CONFIG_PROC_FS */

static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
static inline void pid_ns_release_proc(struct pid_namespace *ns) {}

static inline int proc_alloc_inum(unsigned int *inum)
{
	*inum = 1;
	return 0;
}
static inline void proc_free_inum(unsigned int inum) {}

#endif /* CONFIG_PROC_FS */

static inline int ns_alloc_inum(struct ns_common *ns)
{
	atomic_long_set(&ns->stashed, 0);
	return proc_alloc_inum(&ns->inum);
}

#define ns_free_inum(ns) proc_free_inum((ns)->inum)

extern struct file *proc_ns_fget(int fd);
#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
extern void *ns_get_path(struct path *path, struct task_struct *task,
			const struct proc_ns_operations *ns_ops);

extern int ns_get_name(char *buf, size_t size, struct task_struct *task,
			const struct proc_ns_operations *ns_ops);
extern void nsfs_init(void);

#endif /* _LINUX_PROC_NS_H */
Commit	Line	Data
0bb80f24 DH	1	/*
	2	* procfs namespace bits
	3	*/
	4	#ifndef _LINUX_PROC_NS_H
	5	#define _LINUX_PROC_NS_H
	6
e149ed2b AV	7	#include <linux/ns_common.h>
e149ed2b AV	8
0bb80f24 DH	9	struct pid_namespace;
0bb80f24 DH	10	struct nsproxy;
e149ed2b	11	struct path;
a79a908f AK	12	struct task_struct;
a79a908f AK	13	struct inode;
0bb80f24 DH	14
	15	struct proc_ns_operations {
	16	const char *name;
25b14e92	17	const char *real_ns_name;
0bb80f24	18	int type;
64964528 AV	19	struct ns_common (get)(struct task_struct *task);
	20	void (put)(struct ns_common ns);
	21	int (install)(struct nsproxy nsproxy, struct ns_common *ns);
bcac25a5	22	struct user_namespace (owner)(struct ns_common *ns);
a7306ed8	23	struct ns_common (get_parent)(struct ns_common *ns);
3859a271	24	} __randomize_layout;
0bb80f24	25
0bb80f24 DH	26	extern const struct proc_ns_operations netns_operations;
	27	extern const struct proc_ns_operations utsns_operations;
	28	extern const struct proc_ns_operations ipcns_operations;
	29	extern const struct proc_ns_operations pidns_operations;
eaa0d190	30	extern const struct proc_ns_operations pidns_for_children_operations;
0bb80f24 DH	31	extern const struct proc_ns_operations userns_operations;
0bb80f24 DH	32	extern const struct proc_ns_operations mntns_operations;
a79a908f	33	extern const struct proc_ns_operations cgroupns_operations;
0bb80f24 DH	34
	35	/*
	36	* We always define these enumerators
	37	*/
	38	enum {
	39	PROC_ROOT_INO = 1,
	40	PROC_IPC_INIT_INO = 0xEFFFFFFFU,
	41	PROC_UTS_INIT_INO = 0xEFFFFFFEU,
	42	PROC_USER_INIT_INO = 0xEFFFFFFDU,
	43	PROC_PID_INIT_INO = 0xEFFFFFFCU,
a79a908f	44	PROC_CGROUP_INIT_INO = 0xEFFFFFFBU,
0bb80f24 DH	45	};
	46
	47	#ifdef CONFIG_PROC_FS
	48
	49	extern int pid_ns_prepare_proc(struct pid_namespace *ns);
	50	extern void pid_ns_release_proc(struct pid_namespace *ns);
0bb80f24 DH	51	extern int proc_alloc_inum(unsigned int *pino);
0bb80f24 DH	52	extern void proc_free_inum(unsigned int inum);
0bb80f24 DH	53
	54	#else /* CONFIG_PROC_FS */
	55
	56	static inline int pid_ns_prepare_proc(struct pid_namespace *ns) { return 0; }
	57	static inline void pid_ns_release_proc(struct pid_namespace *ns) {}
	58
0bb80f24 DH	59	static inline int proc_alloc_inum(unsigned int *inum)
	60	{
	61	*inum = 1;
	62	return 0;
	63	}
	64	static inline void proc_free_inum(unsigned int inum) {}
0bb80f24 DH	65
	66	#endif /* CONFIG_PROC_FS */
	67
e149ed2b AV	68	static inline int ns_alloc_inum(struct ns_common *ns)
	69	{
	70	atomic_long_set(&ns->stashed, 0);
	71	return proc_alloc_inum(&ns->inum);
	72	}
	73
6344c433 AV	74	#define ns_free_inum(ns) proc_free_inum((ns)->inum)
6344c433 AV	75
e149ed2b AV	76	extern struct file *proc_ns_fget(int fd);
	77	#define get_proc_ns(inode) ((struct ns_common *)(inode)->i_private)
	78	extern void ns_get_path(struct path path, struct task_struct *task,
	79	const struct proc_ns_operations *ns_ops);
	80
	81	extern int ns_get_name(char buf, size_t size, struct task_struct task,
	82	const struct proc_ns_operations *ns_ops);
	83	extern void nsfs_init(void);
	84
0bb80f24	85	#endif /* _LINUX_PROC_NS_H */