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

#ifndef _LINUX_UTSNAME_H
#define _LINUX_UTSNAME_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];
};

#ifdef __KERNEL__

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

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)
{
	if (flags & CLONE_NEWUTS)
		return -EINVAL;
	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 /* __KERNEL__ */

#endif /* _LINUX_UTSNAME_H */
Commit	Line	Data
1da177e4 LT	1	#ifndef _LINUX_UTSNAME_H
	2	#define _LINUX_UTSNAME_H
	3
	4	#define __OLD_UTS_LEN 8
	5
	6	struct oldold_utsname {
	7	char sysname[9];
	8	char nodename[9];
	9	char release[9];
	10	char version[9];
	11	char machine[9];
	12	};
	13
	14	#define __NEW_UTS_LEN 64
	15
	16	struct old_utsname {
	17	char sysname[65];
	18	char nodename[65];
	19	char release[65];
	20	char version[65];
	21	char machine[65];
	22	};
	23
	24	struct new_utsname {
	25	char sysname[65];
	26	char nodename[65];
	27	char release[65];
	28	char version[65];
	29	char machine[65];
	30	char domainname[65];
	31	};
	32
b119f13f CLG	33	#ifdef __KERNEL__
	34
	35	#include <linux/sched.h>
	36	#include <linux/kref.h>
	37	#include <linux/nsproxy.h>
	38	#include <asm/atomic.h>
	39
4865ecf1 SH	40	struct uts_namespace {
	41	struct kref kref;
	42	struct new_utsname name;
	43	};
	44	extern struct uts_namespace init_uts_ns;
	45
	46	static inline void get_uts_ns(struct uts_namespace *ns)
	47	{
	48	kref_get(&ns->kref);
	49	}
	50
	51	#ifdef CONFIG_UTS_NS
071df104 SH	52	extern int unshare_utsname(unsigned long unshare_flags,
071df104 SH	53	struct uts_namespace **new_uts);
4865ecf1 SH	54	extern int copy_utsname(int flags, struct task_struct *tsk);
	55	extern void free_uts_ns(struct kref *kref);
	56
	57	static inline void put_uts_ns(struct uts_namespace *ns)
	58	{
	59	kref_put(&ns->kref, free_uts_ns);
	60	}
	61	#else
071df104 SH	62	static inline int unshare_utsname(unsigned long unshare_flags,
	63	struct uts_namespace **new_uts)
	64	{
	65	if (unshare_flags & CLONE_NEWUTS)
	66	return -EINVAL;
	67
	68	return 0;
	69	}
	70
4865ecf1 SH	71	static inline int copy_utsname(int flags, struct task_struct *tsk)
4865ecf1 SH	72	{
78d832f6 SH	73	if (flags & CLONE_NEWUTS)
78d832f6 SH	74	return -EINVAL;
4865ecf1 SH	75	return 0;
	76	}
	77	static inline void put_uts_ns(struct uts_namespace *ns)
	78	{
	79	}
	80	#endif
1da177e4	81
0bdd7aab SH	82	static inline struct new_utsname *utsname(void)
0bdd7aab SH	83	{
4865ecf1	84	return &current->nsproxy->uts_ns->name;
0bdd7aab SH	85	}
	86
	87	static inline struct new_utsname *init_utsname(void)
	88	{
4865ecf1	89	return &init_uts_ns.name;
0bdd7aab SH	90	}
0bdd7aab SH	91
1da177e4	92	extern struct rw_semaphore uts_sem;
b119f13f CLG	93
	94	#endif /* __KERNEL__ */
	95
	96	#endif /* _LINUX_UTSNAME_H */