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

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_TIMENS_H
#define _LINUX_TIMENS_H


#include <linux/sched.h>
#include <linux/nsproxy.h>
#include <linux/ns_common.h>
#include <linux/err.h>

struct user_namespace;
extern struct user_namespace init_user_ns;

struct timens_offsets {
	struct timespec64 monotonic;
	struct timespec64 boottime;
};

struct time_namespace {
	struct user_namespace	*user_ns;
	struct ucounts		*ucounts;
	struct ns_common	ns;
	struct timens_offsets	offsets;
	struct page		*vvar_page;
	/* If set prevents changing offsets after any task joined namespace. */
	bool			frozen_offsets;
} __randomize_layout;

extern struct time_namespace init_time_ns;

#ifdef CONFIG_TIME_NS
extern int vdso_join_timens(struct task_struct *task,
			    struct time_namespace *ns);
extern void timens_commit(struct task_struct *tsk, struct time_namespace *ns);

static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
	refcount_inc(&ns->ns.count);
	return ns;
}

struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns);
void free_time_ns(struct time_namespace *ns);
void timens_on_fork(struct nsproxy *nsproxy, struct task_struct *tsk);
struct page *find_timens_vvar_page(struct vm_area_struct *vma);

static inline void put_time_ns(struct time_namespace *ns)
{
	if (refcount_dec_and_test(&ns->ns.count))
		free_time_ns(ns);
}

void proc_timens_show_offsets(struct task_struct *p, struct seq_file *m);

struct proc_timens_offset {
	int			clockid;
	struct timespec64	val;
};

int proc_timens_set_offset(struct file *file, struct task_struct *p,
			   struct proc_timens_offset *offsets, int n);

static inline void timens_add_monotonic(struct timespec64 *ts)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	*ts = timespec64_add(*ts, ns_offsets->monotonic);
}

static inline void timens_add_boottime(struct timespec64 *ts)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	*ts = timespec64_add(*ts, ns_offsets->boottime);
}

static inline u64 timens_add_boottime_ns(u64 nsec)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	return nsec + timespec64_to_ns(&ns_offsets->boottime);
}

static inline void timens_sub_boottime(struct timespec64 *ts)
{
	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;

	*ts = timespec64_sub(*ts, ns_offsets->boottime);
}

ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
				struct timens_offsets *offsets);

static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{
	struct time_namespace *ns = current->nsproxy->time_ns;

	if (likely(ns == &init_time_ns))
		return tim;

	return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
}

#else
static inline int vdso_join_timens(struct task_struct *task,
				   struct time_namespace *ns)
{
	return 0;
}

static inline void timens_commit(struct task_struct *tsk,
				 struct time_namespace *ns)
{
}

static inline struct time_namespace *get_time_ns(struct time_namespace *ns)
{
	return NULL;
}

static inline void put_time_ns(struct time_namespace *ns)
{
}

static inline
struct time_namespace *copy_time_ns(unsigned long flags,
				    struct user_namespace *user_ns,
				    struct time_namespace *old_ns)
{
	if (flags & CLONE_NEWTIME)
		return ERR_PTR(-EINVAL);

	return old_ns;
}

static inline void timens_on_fork(struct nsproxy *nsproxy,
				 struct task_struct *tsk)
{
	return;
}

static inline struct page *find_timens_vvar_page(struct vm_area_struct *vma)
{
	return NULL;
}

static inline void timens_add_monotonic(struct timespec64 *ts) { }
static inline void timens_add_boottime(struct timespec64 *ts) { }

static inline u64 timens_add_boottime_ns(u64 nsec)
{
	return nsec;
}

static inline void timens_sub_boottime(struct timespec64 *ts) { }

static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
{
	return tim;
}
#endif

struct vdso_data *arch_get_vdso_data(void *vvar_page);

#endif /* _LINUX_TIMENS_H */
Commit	Line	Data
769071ac AV	1	/* SPDX-License-Identifier: GPL-2.0 */
	2	#ifndef _LINUX_TIMENS_H
	3	#define _LINUX_TIMENS_H
	4
	5
	6	#include <linux/sched.h>
769071ac AV	7	#include <linux/nsproxy.h>
	8	#include <linux/ns_common.h>
	9	#include <linux/err.h>
	10
	11	struct user_namespace;
	12	extern struct user_namespace init_user_ns;
	13
af993f58 AV	14	struct timens_offsets {
	15	struct timespec64 monotonic;
	16	struct timespec64 boottime;
	17	};
	18
769071ac	19	struct time_namespace {
769071ac AV	20	struct user_namespace *user_ns;
	21	struct ucounts *ucounts;
	22	struct ns_common ns;
af993f58	23	struct timens_offsets offsets;
afaa7b5a DS	24	struct page *vvar_page;
	25	/* If set prevents changing offsets after any task joined namespace. */
	26	bool frozen_offsets;
769071ac AV	27	} __randomize_layout;
	28
	29	extern struct time_namespace init_time_ns;
	30
	31	#ifdef CONFIG_TIME_NS
70ddf651 DS	32	extern int vdso_join_timens(struct task_struct *task,
70ddf651 DS	33	struct time_namespace *ns);
76c12881	34	extern void timens_commit(struct task_struct tsk, struct time_namespace ns);
70ddf651	35
769071ac AV	36	static inline struct time_namespace get_time_ns(struct time_namespace ns)
769071ac AV	37	{
28c41efd	38	refcount_inc(&ns->ns.count);
769071ac AV	39	return ns;
	40	}
	41
	42	struct time_namespace *copy_time_ns(unsigned long flags,
	43	struct user_namespace *user_ns,
	44	struct time_namespace *old_ns);
28c41efd	45	void free_time_ns(struct time_namespace *ns);
5c62634f	46	void timens_on_fork(struct nsproxy nsproxy, struct task_struct tsk);
d6c494e8	47	struct page find_timens_vvar_page(struct vm_area_struct vma);
769071ac AV	48
	49	static inline void put_time_ns(struct time_namespace *ns)
	50	{
28c41efd KT	51	if (refcount_dec_and_test(&ns->ns.count))
28c41efd KT	52	free_time_ns(ns);
769071ac AV	53	}
769071ac AV	54
04a8682a AV	55	void proc_timens_show_offsets(struct task_struct p, struct seq_file m);
	56
	57	struct proc_timens_offset {
	58	int clockid;
	59	struct timespec64 val;
	60	};
	61
	62	int proc_timens_set_offset(struct file file, struct task_struct p,
	63	struct proc_timens_offset *offsets, int n);
	64
af993f58 AV	65	static inline void timens_add_monotonic(struct timespec64 *ts)
	66	{
	67	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	68
	69	ts = timespec64_add(ts, ns_offsets->monotonic);
	70	}
	71
	72	static inline void timens_add_boottime(struct timespec64 *ts)
	73	{
	74	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	75
	76	ts = timespec64_add(ts, ns_offsets->boottime);
	77	}
	78
31909e33 MW	79	static inline u64 timens_add_boottime_ns(u64 nsec)
	80	{
	81	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	82
	83	return nsec + timespec64_to_ns(&ns_offsets->boottime);
	84	}
	85
	86	static inline void timens_sub_boottime(struct timespec64 *ts)
	87	{
	88	struct timens_offsets *ns_offsets = &current->nsproxy->time_ns->offsets;
	89
	90	ts = timespec64_sub(ts, ns_offsets->boottime);
	91	}
	92
89dd8eec AV	93	ktime_t do_timens_ktime_to_host(clockid_t clockid, ktime_t tim,
	94	struct timens_offsets *offsets);
	95
	96	static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
	97	{
	98	struct time_namespace *ns = current->nsproxy->time_ns;
	99
	100	if (likely(ns == &init_time_ns))
	101	return tim;
	102
	103	return do_timens_ktime_to_host(clockid, tim, &ns->offsets);
	104	}
	105
769071ac	106	#else
70ddf651 DS	107	static inline int vdso_join_timens(struct task_struct *task,
	108	struct time_namespace *ns)
	109	{
	110	return 0;
	111	}
	112
76c12881 CB	113	static inline void timens_commit(struct task_struct *tsk,
	114	struct time_namespace *ns)
	115	{
	116	}
	117
769071ac AV	118	static inline struct time_namespace get_time_ns(struct time_namespace ns)
	119	{
	120	return NULL;
	121	}
	122
	123	static inline void put_time_ns(struct time_namespace *ns)
	124	{
	125	}
	126
	127	static inline
	128	struct time_namespace *copy_time_ns(unsigned long flags,
	129	struct user_namespace *user_ns,
	130	struct time_namespace *old_ns)
	131	{
	132	if (flags & CLONE_NEWTIME)
	133	return ERR_PTR(-EINVAL);
	134
	135	return old_ns;
	136	}
	137
5c62634f	138	static inline void timens_on_fork(struct nsproxy *nsproxy,
769071ac AV	139	struct task_struct *tsk)
769071ac AV	140	{
5c62634f	141	return;
769071ac AV	142	}
769071ac AV	143
d6c494e8 JH	144	static inline struct page find_timens_vvar_page(struct vm_area_struct vma)
	145	{
	146	return NULL;
	147	}
	148
af993f58 AV	149	static inline void timens_add_monotonic(struct timespec64 *ts) { }
af993f58 AV	150	static inline void timens_add_boottime(struct timespec64 *ts) { }
31909e33 MW	151
	152	static inline u64 timens_add_boottime_ns(u64 nsec)
	153	{
	154	return nsec;
	155	}
	156
	157	static inline void timens_sub_boottime(struct timespec64 *ts) { }
	158
89dd8eec AV	159	static inline ktime_t timens_ktime_to_host(clockid_t clockid, ktime_t tim)
	160	{
	161	return tim;
	162	}
769071ac AV	163	#endif
769071ac AV	164
b7a7ce1b AB	165	struct vdso_data arch_get_vdso_data(void vvar_page);
b7a7ce1b AB	166
769071ac	167	#endif /* _LINUX_TIMENS_H */