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 *);
67 * cfs_duration_t cfs_time_minimal_timeout(void)
74 #define ONE_BILLION ((u_int64_t)1000000000)
75 #define ONE_MILLION ((u_int64_t) 1000000)
79 #include <linux/config.h>
80 #include <linux/module.h>
81 #include <linux/kernel.h>
82 #include <linux/version.h>
83 #include <linux/time.h>
84 #include <asm/div64.h>
86 #include <libcfs/linux/portals_compat25.h>
88 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0))
91 * old kernels---CURRENT_TIME is struct timeval
93 typedef struct timeval cfs_fs_time_t;
95 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
100 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
102 s->tv_sec = t->tv_sec;
103 s->tv_nsec = t->tv_usec * 1000;
107 * internal helper function used by cfs_fs_time_before*()
109 static inline unsigned long __cfs_fs_time_flat(cfs_fs_time_t *t)
111 return ((unsigned long)t->tv_sec) * ONE_MILLION + t->tv_usec * 1000;
114 #define CURRENT_KERN_TIME xtime
116 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
123 #include <linux/jiffies.h>
125 typedef struct timespec cfs_fs_time_t;
127 static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v)
129 v->tv_sec = t->tv_sec;
130 v->tv_usec = t->tv_nsec / 1000;
133 static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s)
139 * internal helper function used by cfs_fs_time_before*()
141 static inline unsigned long __cfs_fs_time_flat(cfs_fs_time_t *t)
143 return ((unsigned long)t->tv_sec) * ONE_BILLION + t->tv_nsec;
146 #define CURRENT_KERN_TIME CURRENT_TIME
148 /* (LINUX_VERSION_CODE < KERNEL_VERSION(2,5,0)) */
152 * Generic kernel stuff
155 typedef unsigned long cfs_time_t; /* jiffies */
156 typedef long cfs_duration_t;
159 static inline cfs_time_t cfs_time_current(void)
164 static inline time_t cfs_time_current_sec(void)
166 return CURRENT_SECONDS;
169 static inline cfs_time_t cfs_time_add(cfs_time_t t, cfs_duration_t d)
174 static inline cfs_duration_t cfs_time_sub(cfs_time_t t1, cfs_time_t t2)
179 static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2)
181 return time_before(t1, t2);
184 static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2)
186 return time_before_eq(t1, t2);
189 static inline void cfs_fs_time_current(cfs_fs_time_t *t)
191 *t = CURRENT_KERN_TIME;
194 static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t)
199 static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
201 return time_before(__cfs_fs_time_flat(t1), __cfs_fs_time_flat(t2));
204 static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2)
206 return time_before_eq(__cfs_fs_time_flat(t1), __cfs_fs_time_flat(t2));
210 static inline cfs_duration_t cfs_duration_build(int64_t nano)
212 #if (BITS_PER_LONG == 32)
213 /* We cannot use do_div(t, ONE_BILLION), do_div can only process
214 * 64 bits n and 32 bits base */
215 int64_t t = nano * HZ;
218 return (cfs_duration_t)t;
220 return (nano * HZ / ONE_BILLION);
225 static inline cfs_duration_t cfs_time_seconds(int seconds)
230 static inline cfs_time_t cfs_time_shift(int seconds)
232 return jiffies + seconds * HZ;
235 static inline time_t cfs_duration_sec(cfs_duration_t d)
240 static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s)
242 #if (BITS_PER_LONG == 32)
243 uint64_t t = (d - s->tv_sec * HZ) * ONE_MILLION;
244 s->tv_usec = do_div (t, HZ);
246 s->tv_usec = (d - s->tv_sec * HZ) * ONE_MILLION / HZ;
251 static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s)
253 #if (BITS_PER_LONG == 32)
254 uint64_t t = (d - s->tv_sec * HZ) * ONE_BILLION;
255 s->tv_nsec = do_div (t, HZ);
257 s->tv_nsec = (d - s->tv_sec * HZ) * ONE_BILLION / HZ;
262 static inline cfs_duration_t cfs_time_minimal_timeout(void)
267 /* inline function cfs_time_minimal_timeout() can not be used
268 * to initiallize static variable */
269 #define CFS_MIN_DELAY (1)
271 #define CFS_TIME_T "%lu"
272 #define CFS_DURATION_T "%ld"
274 #else /* !__KERNEL__ */
277 * Liblustre. time(2) based implementation.
279 #include <libcfs/user-time.h>
280 #endif /* __KERNEL__ */
282 /* __LIBCFS_LINUX_LINUX_TIME_H__ */
286 * c-indentation-style: "K&R"