[mirror_ubuntu-hirsute-kernel.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>

struct user_namespace {
	struct kref		kref;
	struct user_namespace	*parent;
	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	8
acce292c CLG	9	struct user_namespace {
acce292c CLG	10	struct kref kref;
aeb3ae9d	11	struct user_namespace *parent;
18b6e041	12	struct user_struct *creator;
51708366	13	struct work_struct destroyer;
acce292c CLG	14	};
	15
	16	extern struct user_namespace init_user_ns;
	17
	18	#ifdef CONFIG_USER_NS
	19
	20	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	21	{
	22	if (ns)
	23	kref_get(&ns->kref);
	24	return ns;
	25	}
	26
18b6e041	27	extern int create_user_ns(struct cred *new);
acce292c CLG	28	extern void free_user_ns(struct kref *kref);
	29
	30	static inline void put_user_ns(struct user_namespace *ns)
	31	{
	32	if (ns)
	33	kref_put(&ns->kref, free_user_ns);
	34	}
	35
5c1469de EB	36	uid_t user_ns_map_uid(struct user_namespace to, const struct cred cred, uid_t uid);
	37	gid_t user_ns_map_gid(struct user_namespace to, const struct cred cred, gid_t gid);
	38
acce292c CLG	39	#else
	40
	41	static inline struct user_namespace get_user_ns(struct user_namespace ns)
	42	{
	43	return &init_user_ns;
	44	}
	45
18b6e041	46	static inline int create_user_ns(struct cred *new)
acce292c	47	{
18b6e041	48	return -EINVAL;
acce292c CLG	49	}
	50
	51	static inline void put_user_ns(struct user_namespace *ns)
	52	{
	53	}
	54
5c1469de EB	55	static inline uid_t user_ns_map_uid(struct user_namespace *to,
	56	const struct cred *cred, uid_t uid)
	57	{
	58	return uid;
	59	}
	60	static inline gid_t user_ns_map_gid(struct user_namespace *to,
	61	const struct cred *cred, gid_t gid)
	62	{
	63	return gid;
	64	}
	65
acce292c CLG	66	#endif
	67
	68	#endif /* _LINUX_USER_H */