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36 * libcfs/include/libcfs/linux/linux-time.h
38 * Implementation of portable time API for Linux (kernel and user-level).
40 * Author: Nikita Danilov <nikita@clusterfs.com>
43 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
44 #define __LIBCFS_LINUX_LINUX_TIME_H__
46 #ifndef __LIBCFS_LIBCFS_H__
47 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
51 #error This include is only for kernel use.
54 /* Portable time API */
57 * Platform provides three opaque data-types:
59 * cfs_time_t represents point in time. This is internal kernel
60 * time rather than "wall clock". This time bears no
61 * relation to gettimeofday().
63 * cfs_duration_t represents time interval with resolution of internal
66 * cfs_fs_time_t represents instance in world-visible time. This is
67 * used in file-system time-stamps
69 * cfs_time_t cfs_time_current(void);
70 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
71 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
72 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
73 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
75 * cfs_duration_t cfs_duration_build(int64_t);
77 * time_t cfs_duration_sec (cfs_duration_t);
78 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
79 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
81 * void cfs_fs_time_current(cfs_fs_time_t *);
82 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
83 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
84 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
85 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
86 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
93 #define ONE_BILLION ((u_int64_t)1000000000)
94 #define ONE_MILLION 1000000
97 #error This include is only for kernel use.
100 #include <linux/module.h>
101 #include <linux/kernel.h>
102 #include <linux/version.h>
103 #include <linux/time.h>
104 #include <asm/div64.h>
110 #include <linux/jiffies.h>
112 typedef struct timespec cfs_fs_time_t;
114 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
116 v->tv_sec = t->tv_sec;
117 v->tv_usec = t->tv_nsec / 1000;
120 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
126 * internal helper function used by cfs_fs_time_before*()
128 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
130 return (unsigned long long)t->tv_sec * NSEC_PER_SEC + t->tv_nsec;
135 * Generic kernel stuff
138 typedef unsigned long cfs_time_t; /* jiffies */
139 typedef long cfs_duration_t;
140 typedef cycles_t cfs_cycles_t;
142 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
144 return time_before(t1, t2);
147 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
149 return time_before_eq(t1, t2);
152 static inline cfs_time_t cfs_time_current(void)
157 static inline time_t cfs_time_current_sec(void)
159 return get_seconds();
162 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
167 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
172 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
174 return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2);
177 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
179 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
182 static inline cfs_duration_t cfs_time_seconds(int seconds)
185 return ((cfs_duration_t)seconds) * msecs_to_jiffies(MSEC_PER_SEC);
188 static inline time_t cfs_duration_sec(cfs_duration_t d)
191 return d / msecs_to_jiffies(MSEC_PER_SEC);
194 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
196 #if (BITS_PER_LONG == 32)
197 if (msecs_to_jiffies(MSEC_PER_SEC) > 4096) {
200 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
201 t = (d - (cfs_duration_t)s->tv_sec *
202 msecs_to_jiffies(MSEC_PER_SEC)) * USEC_PER_SEC;
203 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
206 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
207 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
208 msecs_to_jiffies(MSEC_PER_SEC)) *
209 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
212 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
213 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec *
214 msecs_to_jiffies(MSEC_PER_SEC)) *
215 USEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
219 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
221 #if (BITS_PER_LONG == 32)
224 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
225 t = (d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) * NSEC_PER_SEC;
226 do_div(t, msecs_to_jiffies(MSEC_PER_SEC));
229 s->tv_sec = d / msecs_to_jiffies(MSEC_PER_SEC);
230 s->tv_nsec = ((d - s->tv_sec * msecs_to_jiffies(MSEC_PER_SEC)) *
231 NSEC_PER_SEC) / msecs_to_jiffies(MSEC_PER_SEC);
235 #define cfs_time_current_64 get_jiffies_64
237 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
242 static inline __u64 cfs_time_shift_64(int seconds)
244 return cfs_time_add_64(cfs_time_current_64(),
245 cfs_time_seconds(seconds));
248 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
250 return (__s64)t2 - (__s64)t1 > 0;
253 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
255 return (__s64)t2 - (__s64)t1 >= 0;
264 #define CFS_TIME_T "%lu"
265 #define CFS_DURATION_T "%ld"
268 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
271 * c-indentation-style: "K&R"