[linux-2.6-block.git] / include / linux / utsname.h

#ifndef _LINUX_UTSNAME_H
#define _LINUX_UTSNAME_H

#include <linux/sched.h>
#include <linux/kref.h>
#include <linux/nsproxy.h>
#include <asm/atomic.h>

#define __OLD_UTS_LEN 8

struct oldold_utsname {
	char sysname[9];
	char nodename[9];
	char release[9];
	char version[9];
	char machine[9];
};

#define __NEW_UTS_LEN 64

struct old_utsname {
	char sysname[65];
	char nodename[65];
	char release[65];
	char version[65];
	char machine[65];
};

struct new_utsname {
	char sysname[65];
	char nodename[65];
	char release[65];
	char version[65];
	char machine[65];
	char domainname[65];
};

struct uts_namespace {
	struct kref kref;
	struct new_utsname name;
};
extern struct uts_namespace init_uts_ns;

static inline void get_uts_ns(struct uts_namespace *ns)
{
	kref_get(&ns->kref);
}

#ifdef CONFIG_UTS_NS
extern int unshare_utsname(unsigned long unshare_flags,
				struct uts_namespace **new_uts);
extern int copy_utsname(int flags, struct task_struct *tsk);
extern void free_uts_ns(struct kref *kref);

static inline void put_uts_ns(struct uts_namespace *ns)
{
	kref_put(&ns->kref, free_uts_ns);
}
#else
static inline int unshare_utsname(unsigned long unshare_flags,
			struct uts_namespace **new_uts)
{
	if (unshare_flags & CLONE_NEWUTS)
		return -EINVAL;

	return 0;
}

static inline int copy_utsname(int flags, struct task_struct *tsk)
{
	return 0;
}
static inline void put_uts_ns(struct uts_namespace *ns)
{
}
#endif

static inline struct new_utsname *utsname(void)
{
	return &current->nsproxy->uts_ns->name;
}

static inline struct new_utsname *init_utsname(void)
{
	return &init_uts_ns.name;
}

extern struct rw_semaphore uts_sem;
#endif
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_UTSNAME_H
	2	#define _LINUX_UTSNAME_H
	3
4865ecf1 SH	4	#include <linux/sched.h>
	5	#include <linux/kref.h>
	6	#include <linux/nsproxy.h>
	7	#include <asm/atomic.h>
	8
1da177e4 LT	9	#define __OLD_UTS_LEN 8
	10
	11	struct oldold_utsname {
	12	char sysname[9];
	13	char nodename[9];
	14	char release[9];
	15	char version[9];
	16	char machine[9];
	17	};
	18
	19	#define __NEW_UTS_LEN 64
	20
	21	struct old_utsname {
	22	char sysname[65];
	23	char nodename[65];
	24	char release[65];
	25	char version[65];
	26	char machine[65];
	27	};
	28
	29	struct new_utsname {
	30	char sysname[65];
	31	char nodename[65];
	32	char release[65];
	33	char version[65];
	34	char machine[65];
	35	char domainname[65];
	36	};
	37
4865ecf1 SH	38	struct uts_namespace {
	39	struct kref kref;
	40	struct new_utsname name;
	41	};
	42	extern struct uts_namespace init_uts_ns;
	43
	44	static inline void get_uts_ns(struct uts_namespace *ns)
	45	{
	46	kref_get(&ns->kref);
	47	}
	48
	49	#ifdef CONFIG_UTS_NS
071df104 SH	50	extern int unshare_utsname(unsigned long unshare_flags,
071df104 SH	51	struct uts_namespace **new_uts);
4865ecf1 SH	52	extern int copy_utsname(int flags, struct task_struct *tsk);
	53	extern void free_uts_ns(struct kref *kref);
	54
	55	static inline void put_uts_ns(struct uts_namespace *ns)
	56	{
	57	kref_put(&ns->kref, free_uts_ns);
	58	}
	59	#else
071df104 SH	60	static inline int unshare_utsname(unsigned long unshare_flags,
	61	struct uts_namespace **new_uts)
	62	{
	63	if (unshare_flags & CLONE_NEWUTS)
	64	return -EINVAL;
	65
	66	return 0;
	67	}
	68
4865ecf1 SH	69	static inline int copy_utsname(int flags, struct task_struct *tsk)
	70	{
	71	return 0;
	72	}
	73	static inline void put_uts_ns(struct uts_namespace *ns)
	74	{
	75	}
	76	#endif
1da177e4	77
0bdd7aab SH	78	static inline struct new_utsname *utsname(void)
0bdd7aab SH	79	{
4865ecf1	80	return &current->nsproxy->uts_ns->name;
0bdd7aab SH	81	}
	82
	83	static inline struct new_utsname *init_utsname(void)
	84	{
4865ecf1	85	return &init_uts_ns.name;
0bdd7aab SH	86	}
0bdd7aab SH	87
1da177e4 LT	88	extern struct rw_semaphore uts_sem;
1da177e4 LT	89	#endif