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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
96 #error This include is only for kernel use.
99 #ifndef AUTOCONF_INCLUDED
100 #include <linux/config.h>
102 #include <linux/module.h>
103 #include <linux/kernel.h>
104 #include <linux/version.h>
105 #include <linux/time.h>
106 #include <asm/div64.h>
108 #include <libcfs/linux/portals_compat25.h>
114 #include <linux/jiffies.h>
116 typedef struct timespec cfs_fs_time_t;
118 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
120 v->tv_sec = t->tv_sec;
121 v->tv_usec = t->tv_nsec / 1000;
124 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
130 * internal helper function used by cfs_fs_time_before*()
132 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
134 return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec;
137 #define CURRENT_KERN_TIME CURRENT_TIME
140 * Generic kernel stuff
143 typedef unsigned long cfs_time_t; /* jiffies */
144 typedef long cfs_duration_t;
145 typedef cycles_t cfs_cycles_t;
147 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
149 return time_before(t1, t2);
152 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
154 return time_before_eq(t1, t2);
157 static inline cfs_time_t cfs_time_current(void)
162 static inline time_t cfs_time_current_sec(void)
164 return CURRENT_SECONDS;
167 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
169 *t = CURRENT_KERN_TIME;
172 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
177 static inline int cfs_fs_time_before(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 int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
184 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
188 static inline cfs_duration_t cfs_duration_build(int64_t nano)
190 #if (BITS_PER_LONG == 32)
191 /* We cannot use do_div(t, ONE_BILLION), do_div can only process
192 * 64 bits n and 32 bits base */
193 int64_t t = nano * HZ;
196 return (cfs_duration_t)t;
198 return (nano * HZ / ONE_BILLION);
203 static inline cfs_duration_t cfs_time_seconds(int seconds)
205 return ((cfs_duration_t)seconds) * HZ;
208 static inline time_t cfs_duration_sec(cfs_duration_t d)
213 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
215 #if (BITS_PER_LONG == 32) && (HZ > 4096)
219 t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION;
224 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * \
229 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
231 #if (BITS_PER_LONG == 32)
235 t = (d - s->tv_sec * HZ) * ONE_BILLION;
240 s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ;
244 #define cfs_time_current_64 get_jiffies_64
246 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
251 static inline __u64 cfs_time_shift_64(int seconds)
253 return cfs_time_add_64(cfs_time_current_64(),
254 cfs_time_seconds(seconds));
257 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
259 return (__s64)t2 - (__s64)t1 > 0;
262 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
264 return (__s64)t2 - (__s64)t1 >= 0;
273 #define CFS_TIME_T "%lu"
274 #define CFS_DURATION_T "%ld"
276 #define cfs_gettimeofday(tv) do_gettimeofday(tv)
278 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */
281 * c-indentation-style: "K&R"