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34 * libcfs/include/libcfs/linux/linux-time.h
36 * Implementation of portable time API for Linux (kernel and user-level).
38 * Author: Nikita Danilov <nikita@clusterfs.com>
41 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
42 #define __LIBCFS_LINUX_LINUX_TIME_H__
44 #ifndef __LIBCFS_LIBCFS_H__
45 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
49 #error This include is only for kernel use.
52 /* Portable time API */
55 * Platform provides three opaque data-types:
57 * cfs_time_t represents point in time. This is internal kernel
58 * time rather than "wall clock". This time bears no
59 * relation to gettimeofday().
61 * cfs_duration_t represents time interval with resolution of internal
64 * cfs_fs_time_t represents instance in world-visible time. This is
65 * used in file-system time-stamps
67 * cfs_time_t cfs_time_current(void);
68 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
69 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
70 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
71 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
73 * cfs_duration_t cfs_duration_build(int64_t);
75 * time_t cfs_duration_sec (cfs_duration_t);
76 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
77 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
79 * void cfs_fs_time_current(cfs_fs_time_t *);
80 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
81 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
82 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
83 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
84 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
91 #define ONE_BILLION ((u_int64_t)1000000000)
92 #define ONE_MILLION 1000000
95 #error This include is only for kernel use.
98 #include <linux/module.h>
99 #include <linux/kernel.h>
100 #include <linux/version.h>
101 #include <linux/time.h>
102 #include <asm/div64.h>
108 #include <linux/jiffies.h>
110 typedef struct timespec cfs_fs_time_t;
112 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
114 v->tv_sec = t->tv_sec;
115 v->tv_usec = t->tv_nsec / 1000;
118 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
124 * internal helper function used by cfs_fs_time_before*()
126 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
128 return (unsigned long long)t->tv_sec * NSEC_PER_SEC + t->tv_nsec;
133 * Generic kernel stuff
136 typedef unsigned long cfs_time_t; /* jiffies */
137 typedef long cfs_duration_t;
138 typedef cycles_t cfs_cycles_t;
140 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
142 return time_before(t1, t2);
145 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
147 return time_before_eq(t1, t2);
150 static inline cfs_time_t cfs_time_current(void)
155 static inline time_t cfs_time_current_sec(void)
157 return get_seconds();
160 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
165 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
170 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
172 return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2);
175 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
177 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
180 static inline cfs_duration_t cfs_time_seconds(int seconds)
183 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
186 static inline time_t cfs_duration_sec(cfs_duration_t d)
189 return d / msecs_to_jiffies(MSEC_PER_SEC);
192 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
194 #if (BITS_PER_LONG == 32)
195 if (msecs_to_jiffies(MSEC_PER_SEC) > 4096) {
198 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
199 t = (d - (cfs_duration_t)s->tv_sec *
200 msecs_to_jiffies(MSEC_PER_SEC)) * USEC_PER_SEC;
201 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
204 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
205 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
206 msecs_to_jiffies(MSEC_PER_SEC)) *
207 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
210 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
211 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
212 msecs_to_jiffies(MSEC_PER_SEC)) *
213 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
217 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
219 #if (BITS_PER_LONG == 32)
222 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
223 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
224 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
227 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
228 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
229 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
233 #define cfs_time_current_64 get_jiffies_64
235 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
240 static inline __u64 cfs_time_shift_64(int seconds)
242 return cfs_time_add_64(cfs_time_current_64(),
243 cfs_time_seconds(seconds));
246 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
248 return (__s64)t2 - (__s64)t1 > 0;
251 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
253 return (__s64)t2 - (__s64)t1 >= 0;
262 #define CFS_TIME_T "%lu"
263 #define CFS_DURATION_T "%ld"
266 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
269 * c-indentation-style: "K&R"