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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 <linux/libcfs/libcfs.h> instead
49 /* Portable time API */
52 * Platform provides three opaque data-types:
54 * cfs_time_t represents point in time. This is internal kernel
55 * time rather than "wall clock". This time bears no
56 * relation to gettimeofday().
58 * cfs_duration_t represents time interval with resolution of internal
61 * cfs_fs_time_t represents instance in world-visible time. This is
62 * used in file-system time-stamps
64 * cfs_time_t cfs_time_current(void);
65 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
66 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
67 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
68 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
70 * cfs_duration_t cfs_duration_build(int64_t);
72 * time_t cfs_duration_sec (cfs_duration_t);
73 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
74 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
76 * void cfs_fs_time_current(cfs_fs_time_t *);
77 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
78 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
79 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
80 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
81 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
88 #define ONE_BILLION ((u_int64_t)1000000000)
89 #define ONE_MILLION 1000000
92 #include <linux/module.h>
93 #include <linux/kernel.h>
94 #include <linux/time.h>
95 #include <asm/div64.h>
97 #include <linux/libcfs/linux/portals_compat25.h>
103 #include <linux/jiffies.h>
105 typedef struct timespec cfs_fs_time_t;
107 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
109 v->tv_sec = t->tv_sec;
110 v->tv_usec = t->tv_nsec / 1000;
113 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
119 * internal helper function used by cfs_fs_time_before*()
121 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
123 return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec;
128 * Generic kernel stuff
131 typedef unsigned long cfs_time_t; /* jiffies */
132 typedef long cfs_duration_t;
133 typedef cycles_t cfs_cycles_t;
135 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
137 return time_before(t1, t2);
140 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
142 return time_before_eq(t1, t2);
145 static inline cfs_time_t cfs_time_current(void)
150 static inline time_t cfs_time_current_sec(void)
152 return get_seconds();
155 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
160 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
165 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
167 return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2);
170 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
172 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
176 static inline cfs_duration_t cfs_duration_build(int64_t nano)
178 #if (BITS_PER_LONG == 32)
179 /* We cannot use do_div(t, ONE_BILLION), do_div can only process
180 * 64 bits n and 32 bits base */
181 int64_t t = nano * HZ;
184 return (cfs_duration_t)t;
186 return (nano * HZ / ONE_BILLION);
191 static inline cfs_duration_t cfs_time_seconds(int seconds)
193 return ((cfs_duration_t)seconds) * HZ;
196 static inline time_t cfs_duration_sec(cfs_duration_t d)
201 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
203 #if (BITS_PER_LONG == 32) && (HZ > 4096)
207 t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION;
212 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * \
217 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
219 #if (BITS_PER_LONG == 32)
223 t = (d - s->tv_sec * HZ) * ONE_BILLION;
228 s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ;
232 #define cfs_time_current_64 get_jiffies_64
234 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
239 static inline __u64 cfs_time_shift_64(int seconds)
241 return cfs_time_add_64(cfs_time_current_64(),
242 cfs_time_seconds(seconds));
245 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
247 return (__s64)t2 - (__s64)t1 > 0;
250 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
252 return (__s64)t2 - (__s64)t1 >= 0;
261 #define CFS_TIME_T "%lu"
262 #define CFS_DURATION_T "%ld"
265 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
268 * c-indentation-style: "K&R"