1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Copyright (C) 2004 Cluster File Systems, Inc.
5 * Author: Nikita Danilov <nikita@clusterfs.com>
7 * This file is part of Lustre, http://www.lustre.org.
9 * Lustre is free software; you can redistribute it and/or modify it under the
10 * terms of version 2 of the GNU General Public License as published by the
11 * Free Software Foundation.
13 * Lustre is distributed in the hope that it will be useful, but WITHOUT ANY
14 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License along
19 * with Lustre; if not, write to the Free Software Foundation, Inc., 675 Mass
20 * Ave, Cambridge, MA 02139, USA.
22 * Implementation of portable time API for Linux (kernel and user-level).
26 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
27 #define __LIBCFS_LINUX_LINUX_TIME_H__
29 #ifndef __LIBCFS_LIBCFS_H__
30 #error Do not #include this file directly. #include <libcfs/libcfs.h> instead
33 /* Portable time API */
36 * Platform provides three opaque data-types:
38 * cfs_time_t represents point in time. This is internal kernel
39 * time rather than "wall clock". This time bears no
40 * relation to gettimeofday().
42 * cfs_duration_t represents time interval with resolution of internal
45 * cfs_fs_time_t represents instance in world-visible time. This is
46 * used in file-system time-stamps
48 * cfs_time_t cfs_time_current(void);
49 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
50 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
51 * int cfs_time_before (cfs_time_t, cfs_time_t);
52 * int cfs_time_beforeq(cfs_time_t, cfs_time_t);
54 * cfs_duration_t cfs_duration_build(int64_t);
56 * time_t cfs_duration_sec (cfs_duration_t);
57 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
58 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
60 * void cfs_fs_time_current(cfs_fs_time_t *);
61 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
62 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
63 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
64 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
65 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
72 #define ONE_BILLION ((u_int64_t)1000000000)
73 #define ONE_MILLION 1000000
76 #ifndef AUTOCONF_INCLUDED
77 #include <linux/config.h>
79 #include <linux/module.h>
80 #include <linux/kernel.h>
81 #include <linux/version.h>
82 #include <linux/time.h>
83 #include <asm/div64.h>
85 #include <libcfs/linux/portals_compat25.h>
87 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
90 * old kernels---CURRENT_TIME is struct timeval
92 typedef struct timeval cfs_fs_time_t;
94 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
99 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
101 s->tv_sec = t->tv_sec;
102 s->tv_nsec = t->tv_usec * 1000;
106 * internal helper function used by cfs_fs_time_before*()
108 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
110 return (unsigned long long)t->tv_sec * ONE_MILLION + t->tv_usec;
113 #define CURRENT_KERN_TIME xtime
116 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
122 #include <linux/jiffies.h>
124 typedef struct timespec cfs_fs_time_t;
126 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
128 v->tv_sec = t->tv_sec;
129 v->tv_usec = t->tv_nsec / 1000;
132 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
138 * internal helper function used by cfs_fs_time_before*()
140 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
142 return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec;
145 #define CURRENT_KERN_TIME CURRENT_TIME
147 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
151 * Generic kernel stuff
154 typedef unsigned long cfs_time_t; /* jiffies */
155 typedef long cfs_duration_t;
158 static inline cfs_time_t cfs_time_current(void)
163 static inline time_t cfs_time_current_sec(void)
165 return CURRENT_SECONDS;
168 static inline cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d)
173 static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2)
178 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
180 return time_before(t1, t2);
183 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
185 return time_before_eq(t1, t2);
188 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
190 *t = CURRENT_KERN_TIME;
193 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
198 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
200 return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2);
203 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
205 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
209 static inline cfs_duration_t cfs_duration_build(int64_t nano)
211 #if (BITS_PER_LONG == 32)
212 /* We cannot use do_div(t, ONE_BILLION), do_div can only process
213 * 64 bits n and 32 bits base */
214 int64_t t = nano * HZ;
217 return (cfs_duration_t)t;
219 return (nano * HZ / ONE_BILLION);
224 static inline cfs_duration_t cfs_time_seconds(int seconds)
226 return ((cfs_duration_t)seconds) * HZ;
229 static inline time_t cfs_duration_sec(cfs_duration_t d)
234 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
236 #if (BITS_PER_LONG == 32) && (HZ > 4096)
240 t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION;
245 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION) / HZ;
249 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
251 #if (BITS_PER_LONG == 32)
255 t = (d - s->tv_sec * HZ) * ONE_BILLION;
260 s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ;
264 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
266 #define cfs_time_current_64 get_jiffies_64
268 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
273 static inline __u64 cfs_time_shift_64(int seconds)
275 return cfs_time_add_64(cfs_time_current_64(),
276 cfs_time_seconds(seconds));
279 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
281 return (__s64)t2 - (__s64)t1 > 0;
284 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
286 return (__s64)t2 - (__s64)t1 >= 0;
290 #define cfs_time_current_64 cfs_time_current
291 #define cfs_time_add_64 cfs_time_add
292 #define cfs_time_shift_64 cfs_time_shift
293 #define cfs_time_before_64 cfs_time_before
294 #define cfs_time_beforeq_64 cfs_time_beforeq
302 #define CFS_TIME_T "%lu"
303 #define CFS_DURATION_T "%ld"
305 #else /* !__KERNEL__ */
308 * Liblustre. time(2) based implementation.
311 #define CFS_TIME_T "%lu"
313 #include <libcfs/user-time.h>
315 #endif /* __KERNEL__ */
317 /* __LIBCFS_LINUX_LINUX_TIME_H__ */
321 * c-indentation-style: "K&R"