[linux-2.6-block.git] / include / linux / time64.h

#ifndef _LINUX_TIME64_H
#define _LINUX_TIME64_H

#include <uapi/linux/time.h>
#include <linux/math64.h>

typedef __s64 time64_t;

/*
 * This wants to go into uapi/linux/time.h once we agreed about the
 * userspace interfaces.
 */
#if __BITS_PER_LONG == 64
# define timespec64 timespec
#define itimerspec64 itimerspec
#else
struct timespec64 {
	time64_t	tv_sec;			/* seconds */
	long		tv_nsec;		/* nanoseconds */
};

struct itimerspec64 {
	struct timespec64 it_interval;
	struct timespec64 it_value;
};

#endif

/* Parameters used to convert the timespec values: */
#define MSEC_PER_SEC	1000L
#define USEC_PER_MSEC	1000L
#define NSEC_PER_USEC	1000L
#define NSEC_PER_MSEC	1000000L
#define USEC_PER_SEC	1000000L
#define NSEC_PER_SEC	1000000000L
#define FSEC_PER_SEC	1000000000000000LL

/* Located here for timespec[64]_valid_strict */
#define TIME64_MAX			((s64)~((u64)1 << 63))
#define KTIME_MAX			((s64)~((u64)1 << 63))
#define KTIME_SEC_MAX			(KTIME_MAX / NSEC_PER_SEC)

#if __BITS_PER_LONG == 64

static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
{
	return ts64;
}

static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
{
	return ts;
}

static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
{
	return *its64;
}

static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
{
	return *its;
}

# define timespec64_equal		timespec_equal
# define timespec64_compare		timespec_compare
# define set_normalized_timespec64	set_normalized_timespec
# define timespec64_add_safe		timespec_add_safe
# define timespec64_add			timespec_add
# define timespec64_sub			timespec_sub
# define timespec64_valid		timespec_valid
# define timespec64_valid_strict	timespec_valid_strict
# define timespec64_to_ns		timespec_to_ns
# define ns_to_timespec64		ns_to_timespec
# define timespec64_add_ns		timespec_add_ns

#else

static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
{
	struct timespec ret;

	ret.tv_sec = (time_t)ts64.tv_sec;
	ret.tv_nsec = ts64.tv_nsec;
	return ret;
}

static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
{
	struct timespec64 ret;

	ret.tv_sec = ts.tv_sec;
	ret.tv_nsec = ts.tv_nsec;
	return ret;
}

static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
{
	struct itimerspec ret;

	ret.it_interval = timespec64_to_timespec(its64->it_interval);
	ret.it_value = timespec64_to_timespec(its64->it_value);
	return ret;
}

static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
{
	struct itimerspec64 ret;

	ret.it_interval = timespec_to_timespec64(its->it_interval);
	ret.it_value = timespec_to_timespec64(its->it_value);
	return ret;
}

static inline int timespec64_equal(const struct timespec64 *a,
				   const struct timespec64 *b)
{
	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
}

/*
 * lhs < rhs:  return <0
 * lhs == rhs: return 0
 * lhs > rhs:  return >0
 */
static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
{
	if (lhs->tv_sec < rhs->tv_sec)
		return -1;
	if (lhs->tv_sec > rhs->tv_sec)
		return 1;
	return lhs->tv_nsec - rhs->tv_nsec;
}

extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);

/*
 * timespec64_add_safe assumes both values are positive and checks for
 * overflow. It will return TIME_T_MAX if the returned value would be
 * smaller then either of the arguments.
 */
extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
					 const struct timespec64 rhs);


static inline struct timespec64 timespec64_add(struct timespec64 lhs,
						struct timespec64 rhs)
{
	struct timespec64 ts_delta;
	set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
				lhs.tv_nsec + rhs.tv_nsec);
	return ts_delta;
}

/*
 * sub = lhs - rhs, in normalized form
 */
static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
						struct timespec64 rhs)
{
	struct timespec64 ts_delta;
	set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
				lhs.tv_nsec - rhs.tv_nsec);
	return ts_delta;
}

/*
 * Returns true if the timespec64 is norm, false if denorm:
 */
static inline bool timespec64_valid(const struct timespec64 *ts)
{
	/* Dates before 1970 are bogus */
	if (ts->tv_sec < 0)
		return false;
	/* Can't have more nanoseconds then a second */
	if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
		return false;
	return true;
}

static inline bool timespec64_valid_strict(const struct timespec64 *ts)
{
	if (!timespec64_valid(ts))
		return false;
	/* Disallow values that could overflow ktime_t */
	if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
		return false;
	return true;
}

/**
 * timespec64_to_ns - Convert timespec64 to nanoseconds
 * @ts:		pointer to the timespec64 variable to be converted
 *
 * Returns the scalar nanosecond representation of the timespec64
 * parameter.
 */
static inline s64 timespec64_to_ns(const struct timespec64 *ts)
{
	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
}

/**
 * ns_to_timespec64 - Convert nanoseconds to timespec64
 * @nsec:	the nanoseconds value to be converted
 *
 * Returns the timespec64 representation of the nsec parameter.
 */
extern struct timespec64 ns_to_timespec64(const s64 nsec);

/**
 * timespec64_add_ns - Adds nanoseconds to a timespec64
 * @a:		pointer to timespec64 to be incremented
 * @ns:		unsigned nanoseconds value to be added
 *
 * This must always be inlined because its used from the x86-64 vdso,
 * which cannot call other kernel functions.
 */
static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
{
	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
	a->tv_nsec = ns;
}

#endif

#endif /* _LINUX_TIME64_H */
Commit	Line	Data
361a3bf0 JS	1	#ifndef _LINUX_TIME64_H
	2	#define _LINUX_TIME64_H
	3
	4	#include <uapi/linux/time.h>
30f3b3f9	5	#include <linux/math64.h>
361a3bf0 JS	6
	7	typedef __s64 time64_t;
	8
	9	/*
	10	* This wants to go into uapi/linux/time.h once we agreed about the
	11	* userspace interfaces.
	12	*/
	13	#if __BITS_PER_LONG == 64
	14	# define timespec64 timespec
19a46fe5	15	#define itimerspec64 itimerspec
361a3bf0 JS	16	#else
	17	struct timespec64 {
	18	time64_t tv_sec; /* seconds */
	19	long tv_nsec; /* nanoseconds */
	20	};
19a46fe5 BW	21
	22	struct itimerspec64 {
	23	struct timespec64 it_interval;
	24	struct timespec64 it_value;
	25	};
	26
361a3bf0 JS	27	#endif
	28
	29	/* Parameters used to convert the timespec values: */
	30	#define MSEC_PER_SEC 1000L
	31	#define USEC_PER_MSEC 1000L
	32	#define NSEC_PER_USEC 1000L
	33	#define NSEC_PER_MSEC 1000000L
	34	#define USEC_PER_SEC 1000000L
	35	#define NSEC_PER_SEC 1000000000L
	36	#define FSEC_PER_SEC 1000000000000000LL
	37
	38	/* Located here for timespec[64]_valid_strict */
833f32d7	39	#define TIME64_MAX ((s64)~((u64)1 << 63))
361a3bf0 JS	40	#define KTIME_MAX ((s64)~((u64)1 << 63))
	41	#define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
	42
	43	#if __BITS_PER_LONG == 64
	44
49cd6f86 JS	45	static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
	46	{
	47	return ts64;
	48	}
	49
	50	static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
	51	{
	52	return ts;
	53	}
	54
19a46fe5 BW	55	static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
	56	{
	57	return *its64;
	58	}
	59
	60	static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
	61	{
	62	return *its;
	63	}
	64
361a3bf0 JS	65	# define timespec64_equal timespec_equal
	66	# define timespec64_compare timespec_compare
	67	# define set_normalized_timespec64 set_normalized_timespec
	68	# define timespec64_add_safe timespec_add_safe
	69	# define timespec64_add timespec_add
	70	# define timespec64_sub timespec_sub
	71	# define timespec64_valid timespec_valid
	72	# define timespec64_valid_strict timespec_valid_strict
	73	# define timespec64_to_ns timespec_to_ns
	74	# define ns_to_timespec64 ns_to_timespec
	75	# define timespec64_add_ns timespec_add_ns
	76
	77	#else
	78
49cd6f86 JS	79	static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
	80	{
	81	struct timespec ret;
	82
	83	ret.tv_sec = (time_t)ts64.tv_sec;
	84	ret.tv_nsec = ts64.tv_nsec;
	85	return ret;
	86	}
	87
	88	static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
	89	{
	90	struct timespec64 ret;
	91
	92	ret.tv_sec = ts.tv_sec;
	93	ret.tv_nsec = ts.tv_nsec;
	94	return ret;
	95	}
	96
19a46fe5 BW	97	static inline struct itimerspec itimerspec64_to_itimerspec(struct itimerspec64 *its64)
	98	{
	99	struct itimerspec ret;
	100
	101	ret.it_interval = timespec64_to_timespec(its64->it_interval);
	102	ret.it_value = timespec64_to_timespec(its64->it_value);
	103	return ret;
	104	}
	105
	106	static inline struct itimerspec64 itimerspec_to_itimerspec64(struct itimerspec *its)
	107	{
	108	struct itimerspec64 ret;
	109
	110	ret.it_interval = timespec_to_timespec64(its->it_interval);
	111	ret.it_value = timespec_to_timespec64(its->it_value);
	112	return ret;
	113	}
	114
361a3bf0 JS	115	static inline int timespec64_equal(const struct timespec64 *a,
	116	const struct timespec64 *b)
	117	{
	118	return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
	119	}
	120
	121	/*
	122	* lhs < rhs: return <0
	123	* lhs == rhs: return 0
	124	* lhs > rhs: return >0
	125	*/
	126	static inline int timespec64_compare(const struct timespec64 lhs, const struct timespec64 rhs)
	127	{
	128	if (lhs->tv_sec < rhs->tv_sec)
	129	return -1;
	130	if (lhs->tv_sec > rhs->tv_sec)
	131	return 1;
	132	return lhs->tv_nsec - rhs->tv_nsec;
	133	}
	134
	135	extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
	136
	137	/*
	138	* timespec64_add_safe assumes both values are positive and checks for
	139	* overflow. It will return TIME_T_MAX if the returned value would be
	140	* smaller then either of the arguments.
	141	*/
	142	extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
	143	const struct timespec64 rhs);
	144
	145
	146	static inline struct timespec64 timespec64_add(struct timespec64 lhs,
	147	struct timespec64 rhs)
	148	{
	149	struct timespec64 ts_delta;
	150	set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
	151	lhs.tv_nsec + rhs.tv_nsec);
	152	return ts_delta;
	153	}
	154
	155	/*
	156	* sub = lhs - rhs, in normalized form
	157	*/
	158	static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
	159	struct timespec64 rhs)
	160	{
	161	struct timespec64 ts_delta;
	162	set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
	163	lhs.tv_nsec - rhs.tv_nsec);
	164	return ts_delta;
	165	}
	166
	167	/*
	168	* Returns true if the timespec64 is norm, false if denorm:
	169	*/
	170	static inline bool timespec64_valid(const struct timespec64 *ts)
	171	{
	172	/* Dates before 1970 are bogus */
	173	if (ts->tv_sec < 0)
	174	return false;
	175	/* Can't have more nanoseconds then a second */
	176	if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
	177	return false;
	178	return true;
179	}
180
181	static inline bool timespec64_valid_strict(const struct timespec64 *ts)
182	{
183	if (!timespec64_valid(ts))
184	return false;
185	/* Disallow values that could overflow ktime_t */
186	if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
187	return false;
188	return true;
189	}
190
191	/**
192	* timespec64_to_ns - Convert timespec64 to nanoseconds
193	* @ts: pointer to the timespec64 variable to be converted
194	*
195	* Returns the scalar nanosecond representation of the timespec64
196	* parameter.
197	*/
198	static inline s64 timespec64_to_ns(const struct timespec64 *ts)
199	{
200	return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
201	}
202
203	/**
204	* ns_to_timespec64 - Convert nanoseconds to timespec64
205	* @nsec: the nanoseconds value to be converted
206	*
207	* Returns the timespec64 representation of the nsec parameter.
208	*/
209	extern struct timespec64 ns_to_timespec64(const s64 nsec);
210
211	/**
212	* timespec64_add_ns - Adds nanoseconds to a timespec64
213	* @a: pointer to timespec64 to be incremented
214	* @ns: unsigned nanoseconds value to be added
215	*
216	* This must always be inlined because its used from the x86-64 vdso,
217	* which cannot call other kernel functions.
218	*/
219	static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
220	{
221	a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
222	a->tv_nsec = ns;
223	}
224
225	#endif
226
227	#endif /* _LINUX_TIME64_H */