diff options
Diffstat (limited to 'include/linux/time64.h')
-rw-r--r-- | include/linux/time64.h | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/include/linux/time64.h b/include/linux/time64.h new file mode 100644 index 000000000000..a3831478d9cf --- /dev/null +++ b/include/linux/time64.h | |||
@@ -0,0 +1,190 @@ | |||
1 | #ifndef _LINUX_TIME64_H | ||
2 | #define _LINUX_TIME64_H | ||
3 | |||
4 | #include <uapi/linux/time.h> | ||
5 | |||
6 | typedef __s64 time64_t; | ||
7 | |||
8 | /* | ||
9 | * This wants to go into uapi/linux/time.h once we agreed about the | ||
10 | * userspace interfaces. | ||
11 | */ | ||
12 | #if __BITS_PER_LONG == 64 | ||
13 | # define timespec64 timespec | ||
14 | #else | ||
15 | struct timespec64 { | ||
16 | time64_t tv_sec; /* seconds */ | ||
17 | long tv_nsec; /* nanoseconds */ | ||
18 | }; | ||
19 | #endif | ||
20 | |||
21 | /* Parameters used to convert the timespec values: */ | ||
22 | #define MSEC_PER_SEC 1000L | ||
23 | #define USEC_PER_MSEC 1000L | ||
24 | #define NSEC_PER_USEC 1000L | ||
25 | #define NSEC_PER_MSEC 1000000L | ||
26 | #define USEC_PER_SEC 1000000L | ||
27 | #define NSEC_PER_SEC 1000000000L | ||
28 | #define FSEC_PER_SEC 1000000000000000LL | ||
29 | |||
30 | /* Located here for timespec[64]_valid_strict */ | ||
31 | #define KTIME_MAX ((s64)~((u64)1 << 63)) | ||
32 | #define KTIME_SEC_MAX (KTIME_MAX / NSEC_PER_SEC) | ||
33 | |||
34 | #if __BITS_PER_LONG == 64 | ||
35 | |||
36 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) | ||
37 | { | ||
38 | return ts64; | ||
39 | } | ||
40 | |||
41 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | ||
42 | { | ||
43 | return ts; | ||
44 | } | ||
45 | |||
46 | # define timespec64_equal timespec_equal | ||
47 | # define timespec64_compare timespec_compare | ||
48 | # define set_normalized_timespec64 set_normalized_timespec | ||
49 | # define timespec64_add_safe timespec_add_safe | ||
50 | # define timespec64_add timespec_add | ||
51 | # define timespec64_sub timespec_sub | ||
52 | # define timespec64_valid timespec_valid | ||
53 | # define timespec64_valid_strict timespec_valid_strict | ||
54 | # define timespec64_to_ns timespec_to_ns | ||
55 | # define ns_to_timespec64 ns_to_timespec | ||
56 | # define timespec64_add_ns timespec_add_ns | ||
57 | |||
58 | #else | ||
59 | |||
60 | static inline struct timespec timespec64_to_timespec(const struct timespec64 ts64) | ||
61 | { | ||
62 | struct timespec ret; | ||
63 | |||
64 | ret.tv_sec = (time_t)ts64.tv_sec; | ||
65 | ret.tv_nsec = ts64.tv_nsec; | ||
66 | return ret; | ||
67 | } | ||
68 | |||
69 | static inline struct timespec64 timespec_to_timespec64(const struct timespec ts) | ||
70 | { | ||
71 | struct timespec64 ret; | ||
72 | |||
73 | ret.tv_sec = ts.tv_sec; | ||
74 | ret.tv_nsec = ts.tv_nsec; | ||
75 | return ret; | ||
76 | } | ||
77 | |||
78 | static inline int timespec64_equal(const struct timespec64 *a, | ||
79 | const struct timespec64 *b) | ||
80 | { | ||
81 | return (a->tv_sec == b->tv_sec) && (a->tv_nsec == b->tv_nsec); | ||
82 | } | ||
83 | |||
84 | /* | ||
85 | * lhs < rhs: return <0 | ||
86 | * lhs == rhs: return 0 | ||
87 | * lhs > rhs: return >0 | ||
88 | */ | ||
89 | static inline int timespec64_compare(const struct timespec64 *lhs, const struct timespec64 *rhs) | ||
90 | { | ||
91 | if (lhs->tv_sec < rhs->tv_sec) | ||
92 | return -1; | ||
93 | if (lhs->tv_sec > rhs->tv_sec) | ||
94 | return 1; | ||
95 | return lhs->tv_nsec - rhs->tv_nsec; | ||
96 | } | ||
97 | |||
98 | extern void set_normalized_timespec64(struct timespec64 *ts, time64_t sec, s64 nsec); | ||
99 | |||
100 | /* | ||
101 | * timespec64_add_safe assumes both values are positive and checks for | ||
102 | * overflow. It will return TIME_T_MAX if the returned value would be | ||
103 | * smaller then either of the arguments. | ||
104 | */ | ||
105 | extern struct timespec64 timespec64_add_safe(const struct timespec64 lhs, | ||
106 | const struct timespec64 rhs); | ||
107 | |||
108 | |||
109 | static inline struct timespec64 timespec64_add(struct timespec64 lhs, | ||
110 | struct timespec64 rhs) | ||
111 | { | ||
112 | struct timespec64 ts_delta; | ||
113 | set_normalized_timespec64(&ts_delta, lhs.tv_sec + rhs.tv_sec, | ||
114 | lhs.tv_nsec + rhs.tv_nsec); | ||
115 | return ts_delta; | ||
116 | } | ||
117 | |||
118 | /* | ||
119 | * sub = lhs - rhs, in normalized form | ||
120 | */ | ||
121 | static inline struct timespec64 timespec64_sub(struct timespec64 lhs, | ||
122 | struct timespec64 rhs) | ||
123 | { | ||
124 | struct timespec64 ts_delta; | ||
125 | set_normalized_timespec64(&ts_delta, lhs.tv_sec - rhs.tv_sec, | ||
126 | lhs.tv_nsec - rhs.tv_nsec); | ||
127 | return ts_delta; | ||
128 | } | ||
129 | |||
130 | /* | ||
131 | * Returns true if the timespec64 is norm, false if denorm: | ||
132 | */ | ||
133 | static inline bool timespec64_valid(const struct timespec64 *ts) | ||
134 | { | ||
135 | /* Dates before 1970 are bogus */ | ||
136 | if (ts->tv_sec < 0) | ||
137 | return false; | ||
138 | /* Can't have more nanoseconds then a second */ | ||
139 | if ((unsigned long)ts->tv_nsec >= NSEC_PER_SEC) | ||
140 | return false; | ||
141 | return true; | ||
142 | } | ||
143 | |||
144 | static inline bool timespec64_valid_strict(const struct timespec64 *ts) | ||
145 | { | ||
146 | if (!timespec64_valid(ts)) | ||
147 | return false; | ||
148 | /* Disallow values that could overflow ktime_t */ | ||
149 | if ((unsigned long long)ts->tv_sec >= KTIME_SEC_MAX) | ||
150 | return false; | ||
151 | return true; | ||
152 | } | ||
153 | |||
154 | /** | ||
155 | * timespec64_to_ns - Convert timespec64 to nanoseconds | ||
156 | * @ts: pointer to the timespec64 variable to be converted | ||
157 | * | ||
158 | * Returns the scalar nanosecond representation of the timespec64 | ||
159 | * parameter. | ||
160 | */ | ||
161 | static inline s64 timespec64_to_ns(const struct timespec64 *ts) | ||
162 | { | ||
163 | return ((s64) ts->tv_sec * NSEC_PER_SEC) + ts->tv_nsec; | ||
164 | } | ||
165 | |||
166 | /** | ||
167 | * ns_to_timespec64 - Convert nanoseconds to timespec64 | ||
168 | * @nsec: the nanoseconds value to be converted | ||
169 | * | ||
170 | * Returns the timespec64 representation of the nsec parameter. | ||
171 | */ | ||
172 | extern struct timespec64 ns_to_timespec64(const s64 nsec); | ||
173 | |||
174 | /** | ||
175 | * timespec64_add_ns - Adds nanoseconds to a timespec64 | ||
176 | * @a: pointer to timespec64 to be incremented | ||
177 | * @ns: unsigned nanoseconds value to be added | ||
178 | * | ||
179 | * This must always be inlined because its used from the x86-64 vdso, | ||
180 | * which cannot call other kernel functions. | ||
181 | */ | ||
182 | static __always_inline void timespec64_add_ns(struct timespec64 *a, u64 ns) | ||
183 | { | ||
184 | a->tv_sec += __iter_div_u64_rem(a->tv_nsec + ns, NSEC_PER_SEC, &ns); | ||
185 | a->tv_nsec = ns; | ||
186 | } | ||
187 | |||
188 | #endif | ||
189 | |||
190 | #endif /* _LINUX_TIME64_H */ | ||