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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
48 /* Portable time API */
51 * Platform provides three opaque data-types:
53 * cfs_time_t represents point in time. This is internal kernel
54 * time rather than "wall clock". This time bears no
55 * relation to gettimeofday().
57 * cfs_duration_t represents time interval with resolution of internal
60 * struct timespec represents instance in world-visible time. This is
61 * used in file-system time-stamps
63 * cfs_time_t cfs_time_current(void);
64 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
65 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
66 * int cfs_impl_time_before (cfs_time_t, cfs_time_t);
67 * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t);
69 * cfs_duration_t cfs_duration_build(int64_t);
71 * time_t cfs_duration_sec (cfs_duration_t);
72 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
74 * void cfs_fs_time_current(struct timespec *);
75 * time_t cfs_fs_time_sec (struct timespec *);
76 * void cfs_fs_time_usec (struct timespec *, struct timeval *);
83 #define ONE_BILLION ((u_int64_t)1000000000)
84 #define ONE_MILLION 1000000
86 #include <linux/module.h>
87 #include <linux/kernel.h>
88 #include <linux/time.h>
89 #include <asm/div64.h>
91 #include "portals_compat25.h"
97 #include <linux/jiffies.h>
100 static inline void cfs_fs_time_usec(struct timespec *t, struct timeval *v)
102 v->tv_sec = t->tv_sec;
103 v->tv_usec = t->tv_nsec / 1000;
107 * Generic kernel stuff
110 typedef unsigned long cfs_time_t; /* jiffies */
111 typedef long cfs_duration_t;
113 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
115 return time_before(t1, t2);
118 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
120 return time_before_eq(t1, t2);
123 static inline cfs_time_t cfs_time_current(void)
128 static inline time_t cfs_time_current_sec(void)
130 return get_seconds();
133 static inline void cfs_fs_time_current(struct timespec *t)
138 static inline time_t cfs_fs_time_sec(struct timespec *t)
143 static inline cfs_duration_t cfs_time_seconds(int seconds)
145 return ((cfs_duration_t)seconds) * HZ;
148 static inline time_t cfs_duration_sec(cfs_duration_t d)
153 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
155 #if (BITS_PER_LONG == 32) && (HZ > 4096)
159 t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION;
164 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * \
169 #define cfs_time_current_64 get_jiffies_64
171 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
176 static inline __u64 cfs_time_shift_64(int seconds)
178 return cfs_time_add_64(cfs_time_current_64(),
179 cfs_time_seconds(seconds));
182 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
184 return (__s64)t2 - (__s64)t1 > 0;
187 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
189 return (__s64)t2 - (__s64)t1 >= 0;
197 #define CFS_TIME_T "%lu"
198 #define CFS_DURATION_T "%ld"
200 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */