1 #ifndef _LINUX_TIME64_H
2 #define _LINUX_TIME64_H
4 #include <linux/types.h>
6 typedef __s64 time64_t;
9 * This wants to go into uapi/linux/time.h once we agreed about the
10 * userspace interfaces.
12 #if __BITS_PER_LONG == 64
13 # define timespec64 timespec
16 time64_t tv_sec; /* seconds */
17 long tv_nsec; /* nanoseconds */
21 struct timespec64 it_interval;
22 struct timespec64 it_value;
27 /* Parameters used to convert the timespec values: */
28 #define MSEC_PER_SEC 1000L
29 #define USEC_PER_MSEC 1000L
30 #define NSEC_PER_USEC 1000L
31 #define NSEC_PER_MSEC 1000000L
32 #define USEC_PER_SEC 1000000L
33 #define NSEC_PER_SEC 1000000000L
34 #define FSEC_PER_SEC 1000000000000000LL
36 /* Located here for timespec[64]_valid_strict */
37 #define TIME64_MAX ((s64)~((u64)1 << 63))
38 #define KTIME_MAX ((s64)~((u64)1 << 63))
39 #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC)
41 static inline struct timespec ns_to_timespec(const u64 nsec)
43 return (struct timespec) {
44 .tv_sec = nsec / NSEC_PER_SEC,
45 .tv_nsec = nsec % NSEC_PER_SEC,
49 static inline s64 timespec_to_ns(const struct timespec *ts)
51 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
54 #if __BITS_PER_LONG == 64
56 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
61 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
66 # define timespec64_equal timespec_equal
67 # define timespec64_compare timespec_compare
68 # define set_normalized_timespec64 set_normalized_timespec
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
79 static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64)
83 ret.tv_sec = (time_t)ts64.tv_sec;
84 ret.tv_nsec = ts64.tv_nsec;
88 static inline struct timespec64 timespec_to_timespec64(const struct timespec ts)
90 struct timespec64 ret;
92 ret.tv_sec = ts.tv_sec;
93 ret.tv_nsec = ts.tv_nsec;
97 static inline int timespec64_equal(const struct timespec64 *a,
98 const struct timespec64 *b)
100 return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec);
104 * lhs < rhs: return <0
105 * lhs == rhs: return 0
106 * lhs > rhs: return >0
108 static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs)
110 if (lhs->tv_sec < rhs->tv_sec)
112 if (lhs->tv_sec > rhs->tv_sec)
114 return lhs->tv_nsec - rhs->tv_nsec;
117 extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec);
119 static inline struct timespec64 timespec64_add(struct timespec64 lhs,
120 struct timespec64 rhs)
122 struct timespec64 ts_delta;
123 set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec,
124 lhs.tv_nsec + rhs.tv_nsec);
129 * sub = lhs - rhs, in normalized form
131 static inline struct timespec64 timespec64_sub(struct timespec64 lhs,
132 struct timespec64 rhs)
134 struct timespec64 ts_delta;
135 set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec,
136 lhs.tv_nsec - rhs.tv_nsec);
141 * Returns true if the timespec64 is norm, false if denorm:
143 static inline bool timespec64_valid(const struct timespec64 *ts)
145 /* Dates before 1970 are bogus */
148 /* Can't have more nanoseconds then a second */
149 if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC)
154 static inline bool timespec64_valid_strict(const struct timespec64 *ts)
156 if (!timespec64_valid(ts))
158 /* Disallow values that could overflow ktime_t */
159 if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX)
165 * timespec64_to_ns - Convert timespec64 to nanoseconds
166 * @ts: pointer to the timespec64 variable to be converted
168 * Returns the scalar nanosecond representation of the timespec64
171 static inline s64 timespec64_to_ns(const struct timespec64 *ts)
173 return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec;
177 * ns_to_timespec64 - Convert nanoseconds to timespec64
178 * @nsec: the nanoseconds value to be converted
180 * Returns the timespec64 representation of the nsec parameter.
182 extern struct timespec64 ns_to_timespec64(const s64 nsec);
185 * timespec64_add_ns - Adds nanoseconds to a timespec64
186 * @a: pointer to timespec64 to be incremented
187 * @ns: unsigned nanoseconds value to be added
189 * This must always be inlined because its used from the x86-64 vdso,
190 * which cannot call other kernel functions.
192 static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns)
194 a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns);
201 * timespec64_add_safe assumes both values are positive and checks for
202 * overflow. It will return TIME64_MAX in case of overflow.
204 extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs,
205 const struct timespec64 rhs);
207 static inline struct timespec timespec_trunc(struct timespec t, unsigned gran)
209 /* Avoid division in the common cases 1 ns and 1 s. */
212 } else if (gran == NSEC_PER_SEC) {
214 } else if (gran > 1 && gran < NSEC_PER_SEC) {
215 t.tv_nsec -= t.tv_nsec % gran;
217 WARN(1, "illegal file time granularity: %u", gran);
222 #endif /* _LINUX_TIME64_H */