1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see [sun.com URL with a
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
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
50 /* Portable time API */
53 * Platform provides three opaque data-types:
55 * cfs_time_t represents point in time. This is internal kernel
56 * time rather than "wall clock". This time bears no
57 * relation to gettimeofday().
59 * cfs_duration_t represents time interval with resolution of internal
62 * cfs_fs_time_t represents instance in world-visible time. This is
63 * used in file-system time-stamps
65 * cfs_time_t cfs_time_current(void);
66 * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t);
67 * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t);
68 * int cfs_time_before (cfs_time_t, cfs_time_t);
69 * int cfs_time_beforeq(cfs_time_t, cfs_time_t);
71 * cfs_duration_t cfs_duration_build(int64_t);
73 * time_t cfs_duration_sec (cfs_duration_t);
74 * void cfs_duration_usec(cfs_duration_t, struct timeval *);
75 * void cfs_duration_nsec(cfs_duration_t, struct timespec *);
77 * void cfs_fs_time_current(cfs_fs_time_t *);
78 * time_t cfs_fs_time_sec (cfs_fs_time_t *);
79 * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *);
80 * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *);
81 * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *);
82 * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *);
89 #define ONE_BILLION ((u_int64_t)1000000000)
90 #define ONE_MILLION 1000000
93 #ifndef AUTOCONF_INCLUDED
94 #include <linux/config.h>
96 #include <linux/module.h>
97 #include <linux/kernel.h>
98 #include <linux/version.h>
99 #include <linux/time.h>
100 #include <asm/div64.h>
102 #include <libcfs/linux/portals_compat25.h>
104 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
107 * old kernels---CURRENT_TIME is struct timeval
109 typedef struct timeval cfs_fs_time_t;
111 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
116 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
118 s->tv_sec = t->tv_sec;
119 s->tv_nsec = t->tv_usec * 1000;
123 * internal helper function used by cfs_fs_time_before*()
125 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
127 return (unsigned long long)t->tv_sec * ONE_MILLION + t->tv_usec;
130 #define CURRENT_KERN_TIME xtime
133 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
139 #include <linux/jiffies.h>
141 typedef struct timespec cfs_fs_time_t;
143 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
145 v->tv_sec = t->tv_sec;
146 v->tv_usec = t->tv_nsec / 1000;
149 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
155 * internal helper function used by cfs_fs_time_before*()
157 static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t)
159 return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec;
162 #define CURRENT_KERN_TIME CURRENT_TIME
164 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
168 * Generic kernel stuff
171 typedef unsigned long cfs_time_t; /* jiffies */
172 typedef long cfs_duration_t;
175 static inline cfs_time_t cfs_time_current(void)
180 static inline time_t cfs_time_current_sec(void)
182 return CURRENT_SECONDS;
185 static inline cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d)
190 static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2)
195 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
197 return time_before(t1, t2);
200 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
202 return time_before_eq(t1, t2);
205 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
207 *t = CURRENT_KERN_TIME;
210 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
215 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
217 return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2);
220 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
222 return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2);
226 static inline cfs_duration_t cfs_duration_build(int64_t nano)
228 #if (BITS_PER_LONG == 32)
229 /* We cannot use do_div(t, ONE_BILLION), do_div can only process
230 * 64 bits n and 32 bits base */
231 int64_t t = nano * HZ;
234 return (cfs_duration_t)t;
236 return (nano * HZ / ONE_BILLION);
241 static inline cfs_duration_t cfs_time_seconds(int seconds)
243 return ((cfs_duration_t)seconds) * HZ;
246 static inline time_t cfs_duration_sec(cfs_duration_t d)
251 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
253 #if (BITS_PER_LONG == 32) && (HZ > 4096)
257 t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION;
262 s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION) / HZ;
266 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
268 #if (BITS_PER_LONG == 32)
272 t = (d - s->tv_sec * HZ) * ONE_BILLION;
277 s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ;
281 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,5,0)
283 #define cfs_time_current_64 get_jiffies_64
285 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
290 static inline __u64 cfs_time_shift_64(int seconds)
292 return cfs_time_add_64(cfs_time_current_64(),
293 cfs_time_seconds(seconds));
296 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
298 return (__s64)t2 - (__s64)t1 > 0;
301 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
303 return (__s64)t2 - (__s64)t1 >= 0;
307 #define cfs_time_current_64 cfs_time_current
308 #define cfs_time_add_64 cfs_time_add
309 #define cfs_time_shift_64 cfs_time_shift
310 #define cfs_time_before_64 cfs_time_before
311 #define cfs_time_beforeq_64 cfs_time_beforeq
319 #define CFS_TIME_T "%lu"
320 #define CFS_DURATION_T "%ld"
322 #else /* !__KERNEL__ */
325 * Liblustre. time(2) based implementation.
328 #define CFS_TIME_T "%lu"
330 #include <libcfs/user-time.h>
332 #endif /* __KERNEL__ */
334 /* __LIBCFS_LINUX_LINUX_TIME_H__ */
338 * c-indentation-style: "K&R"