[mirror_ubuntu-artful-kernel.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/ns_common.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;
	struct ucounts *ucounts;
	struct ns_common ns;
};
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/ns_common.h>
	9	#include <linux/err.h>
	10	#include <uapi/linux/utsname.h>
	11
	12	enum uts_proc {
	13	UTS_PROC_OSTYPE,
	14	UTS_PROC_OSRELEASE,
	15	UTS_PROC_VERSION,
	16	UTS_PROC_HOSTNAME,
	17	UTS_PROC_DOMAINNAME,
	18	};
	19
	20	struct user_namespace;
	21	extern struct user_namespace init_user_ns;
	22
	23	struct uts_namespace {
	24	struct kref kref;
	25	struct new_utsname name;
	26	struct user_namespace *user_ns;
	27	struct ucounts *ucounts;
	28	struct ns_common ns;
	29	};
	30	extern struct uts_namespace init_uts_ns;
	31
	32	#ifdef CONFIG_UTS_NS
	33	static inline void get_uts_ns(struct uts_namespace *ns)
	34	{
	35	kref_get(&ns->kref);
	36	}
	37
	38	extern struct uts_namespace *copy_utsname(unsigned long flags,
	39	struct user_namespace user_ns, struct uts_namespace old_ns);
	40	extern void free_uts_ns(struct kref *kref);
	41
	42	static inline void put_uts_ns(struct uts_namespace *ns)
	43	{
	44	kref_put(&ns->kref, free_uts_ns);
	45	}
	46	#else
	47	static inline void get_uts_ns(struct uts_namespace *ns)
	48	{
	49	}
	50
	51	static inline void put_uts_ns(struct uts_namespace *ns)
	52	{
	53	}
	54
	55	static inline struct uts_namespace *copy_utsname(unsigned long flags,
	56	struct user_namespace user_ns, struct uts_namespace old_ns)
	57	{
	58	if (flags & CLONE_NEWUTS)
	59	return ERR_PTR(-EINVAL);
	60
	61	return old_ns;
	62	}
	63	#endif
	64
	65	#ifdef CONFIG_PROC_SYSCTL
	66	extern void uts_proc_notify(enum uts_proc proc);
	67	#else
	68	static inline void uts_proc_notify(enum uts_proc proc)
	69	{
	70	}
	71	#endif
	72
	73	static inline struct new_utsname *utsname(void)
	74	{
	75	return &current->nsproxy->uts_ns->name;
	76	}
	77
	78	static inline struct new_utsname *init_utsname(void)
	79	{
	80	return &init_uts_ns.name;
	81	}
	82
	83	extern struct rw_semaphore uts_sem;
	84
	85	#endif /* _LINUX_UTSNAME_H */