[net-next-2.6.git] / include / linux / user_namespace.h

#ifndef _LINUX_USER_NAMESPACE_H
#define _LINUX_USER_NAMESPACE_H

#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <linux/sched.h>
#include <linux/err.h>

#define UIDHASH_BITS	(CONFIG_BASE_SMALL ? 3 : 8)
#define UIDHASH_SZ	(1 << UIDHASH_BITS)

struct user_namespace {
	struct kref		kref;
	struct hlist_head	uidhash_table[UIDHASH_SZ];
	struct user_struct	*creator;
	struct work_struct	destroyer;
};

extern struct user_namespace init_user_ns;

#ifdef CONFIG_USER_NS

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
	if (ns)
		kref_get(&ns->kref);
	return ns;
}

extern int create_user_ns(struct cred *new);
extern void free_user_ns(struct kref *kref);

static inline void put_user_ns(struct user_namespace *ns)
{
	if (ns)
		kref_put(&ns->kref, free_user_ns);
}

uid_t user_ns_map_uid(struct user_namespace *to, const struct cred *cred, uid_t uid);
gid_t user_ns_map_gid(struct user_namespace *to, const struct cred *cred, gid_t gid);

#else

static inline struct user_namespace *get_user_ns(struct user_namespace *ns)
{
	return &init_user_ns;
}

static inline int create_user_ns(struct cred *new)
{
	return -EINVAL;
}

static inline void put_user_ns(struct user_namespace *ns)
{
}

static inline uid_t user_ns_map_uid(struct user_namespace *to,
	const struct cred *cred, uid_t uid)
{
	return uid;
}
static inline gid_t user_ns_map_gid(struct user_namespace *to,
	const struct cred *cred, gid_t gid)
{
	return gid;
}

#endif

#endif /* _LINUX_USER_H */
Commit	Line	Data
acce292c CLG	1	#ifndef _LINUX_USER_NAMESPACE_H
	2	#define _LINUX_USER_NAMESPACE_H
	3
	4	#include <linux/kref.h>
	5	#include <linux/nsproxy.h>
	6	#include <linux/sched.h>
77ec739d	7	#include <linux/err.h>
acce292c CLG	8
	9	#define UIDHASH_BITS (CONFIG_BASE_SMALL ? 3 : 8)
	10	#define UIDHASH_SZ (1 << UIDHASH_BITS)
	11
	12	struct user_namespace {
	13	struct kref kref;
735de223	14	struct hlist_head uidhash_table[UIDHASH_SZ];
18b6e041	15	struct user_struct *creator;
51708366	16	struct work_struct destroyer;
acce292c CLG	17	};
	18
	19	extern struct user_namespace init_user_ns;
	20
	21	#ifdef CONFIG_USER_NS
	22
	23	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	24	{
	25	if (ns)
	26	kref_get(&ns->kref);
	27	return ns;
	28	}
	29
18b6e041	30	extern int create_user_ns(struct cred *new);
acce292c CLG	31	extern void free_user_ns(struct kref *kref);
	32
	33	static inline void put_user_ns(struct user_namespace *ns)
	34	{
	35	if (ns)
	36	kref_put(&ns->kref, free_user_ns);
	37	}
	38
5c1469de EB	39	uid_t user_ns_map_uid(struct user_namespace to, const struct cred cred, uid_t uid);
	40	gid_t user_ns_map_gid(struct user_namespace to, const struct cred cred, gid_t gid);
	41
acce292c CLG	42	#else
	43
	44	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	45	{
	46	return &init_user_ns;
	47	}
	48
18b6e041	49	static inline int create_user_ns(struct cred *new)
acce292c	50	{
18b6e041	51	return -EINVAL;
acce292c CLG	52	}
	53
	54	static inline void put_user_ns(struct user_namespace *ns)
	55	{
	56	}
	57
5c1469de EB	58	static inline uid_t user_ns_map_uid(struct user_namespace *to,
	59	const struct cred *cred, uid_t uid)
	60	{
	61	return uid;
	62	}
	63	static inline gid_t user_ns_map_gid(struct user_namespace *to,
	64	const struct cred *cred, gid_t gid)
	65	{
	66	return gid;
	67	}
	68
acce292c CLG	69	#endif
	70
	71	#endif /* _LINUX_USER_H */