[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 <linux/err.h>
#include <uapi/linux/utsname.h>

enum uts_proc {
	UTS_PROC_OSTYPE,
	UTS_PROC_OSRELEASE,
	UTS_PROC_VERSION,
	UTS_PROC_HOSTNAME,
	UTS_PROC_DOMAINNAME,
};

struct user_namespace;
extern struct user_namespace init_user_ns;

struct uts_namespace {
	struct kref kref;
	struct new_utsname name;
	struct user_namespace *user_ns;
	unsigned int proc_inum;
};
extern struct uts_namespace init_uts_ns;

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

extern struct uts_namespace *copy_utsname(unsigned long flags,
	struct user_namespace *user_ns, struct uts_namespace *old_ns);
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 void get_uts_ns(struct uts_namespace *ns)
{
}

static inline void put_uts_ns(struct uts_namespace *ns)
{
}

static inline struct uts_namespace *copy_utsname(unsigned long flags,
	struct user_namespace *user_ns, struct uts_namespace *old_ns)
{
	if (flags & CLONE_NEWUTS)
		return ERR_PTR(-EINVAL);

	return old_ns;
}
#endif

#ifdef CONFIG_PROC_SYSCTL
extern void uts_proc_notify(enum uts_proc proc);
#else
static inline void uts_proc_notify(enum uts_proc proc)
{
}
#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 /* _LINUX_UTSNAME_H */
Commit	Line	Data
	1	#ifndef _LINUX_UTSNAME_H
	2	#define _LINUX_UTSNAME_H
	3
	4
	5	#include <linux/sched.h>
	6	#include <linux/kref.h>
	7	#include <linux/nsproxy.h>
	8	#include <linux/err.h>
	9	#include <uapi/linux/utsname.h>
	10
	11	enum uts_proc {
	12	UTS_PROC_OSTYPE,
	13	UTS_PROC_OSRELEASE,
	14	UTS_PROC_VERSION,
	15	UTS_PROC_HOSTNAME,
	16	UTS_PROC_DOMAINNAME,
	17	};
	18
	19	struct user_namespace;
	20	extern struct user_namespace init_user_ns;
	21
	22	struct uts_namespace {
	23	struct kref kref;
	24	struct new_utsname name;
	25	struct user_namespace *user_ns;
	26	unsigned int proc_inum;
	27	};
	28	extern struct uts_namespace init_uts_ns;
	29
	30	#ifdef CONFIG_UTS_NS
	31	static inline void get_uts_ns(struct uts_namespace *ns)
	32	{
	33	kref_get(&ns->kref);
	34	}
	35
	36	extern struct uts_namespace *copy_utsname(unsigned long flags,
	37	struct user_namespace user_ns, struct uts_namespace old_ns);
	38	extern void free_uts_ns(struct kref *kref);
	39
	40	static inline void put_uts_ns(struct uts_namespace *ns)
	41	{
	42	kref_put(&ns->kref, free_uts_ns);
	43	}
	44	#else
	45	static inline void get_uts_ns(struct uts_namespace *ns)
	46	{
	47	}
	48
	49	static inline void put_uts_ns(struct uts_namespace *ns)
	50	{
	51	}
	52
	53	static inline struct uts_namespace *copy_utsname(unsigned long flags,
	54	struct user_namespace user_ns, struct uts_namespace old_ns)
	55	{
	56	if (flags & CLONE_NEWUTS)
	57	return ERR_PTR(-EINVAL);
	58
	59	return old_ns;
	60	}
	61	#endif
	62
	63	#ifdef CONFIG_PROC_SYSCTL
	64	extern void uts_proc_notify(enum uts_proc proc);
	65	#else
	66	static inline void uts_proc_notify(enum uts_proc proc)
	67	{
	68	}
	69	#endif
	70
	71	static inline struct new_utsname *utsname(void)
	72	{
	73	return &current->nsproxy->uts_ns->name;
	74	}
	75
	76	static inline struct new_utsname *init_utsname(void)
	77	{
	78	return &init_uts_ns.name;
	79	}
	80
	81	extern struct rw_semaphore uts_sem;
	82
	83	#endif /* _LINUX_UTSNAME_H */