drivers/staging/lustre/include/linux/libcfs/linux/linux-time.h

   1 /*
   2  * GPL HEADER START
   3  *
   4  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 only,
   8  * as published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but
  11  * WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * General Public License version 2 for more details (a copy is included
  14  * in the LICENSE file that accompanied this code).
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * version 2 along with this program; If not, see
  18  * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
  19  *
  20  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  21  * CA 95054 USA or visit www.sun.com if you need additional information or
  22  * have any questions.
  23  *
  24  * GPL HEADER END
  25  */
  26 /*
  27  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
  28  * Use is subject to license terms.
  29  */
  30 /*
  31  * This file is part of Lustre, http://www.lustre.org/
  32  * Lustre is a trademark of Sun Microsystems, Inc.
  33  *
  34  * libcfs/include/libcfs/linux/linux-time.h
  35  *
  36  * Implementation of portable time API for Linux (kernel and user-level).
  37  *
  38  * Author: Nikita Danilov <nikita@clusterfs.com>
  39  */
  40
  41 #ifndef __LIBCFS_LINUX_LINUX_TIME_H__
  42 #define __LIBCFS_LINUX_LINUX_TIME_H__
  43
  44 #ifndef __LIBCFS_LIBCFS_H__
  45 #error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead
  46 #endif
  47
  48 #define ONE_BILLION ((u_int64_t)1000000000)
  49 #define ONE_MILLION 1000000
  50
  51 #include <linux/module.h>
  52 #include <linux/kernel.h>
  53 #include <linux/time.h>
  54 #include <asm/div64.h>
  55
  56 /*
  57  * post 2.5 kernels.
  58  */
  59
  60 #include <linux/jiffies.h>
  61
  62
  63 static inline void cfs_fs_time_usec(struct timespec *t, struct timeval *v)
  64 {
  65         v->tv_sec  = t->tv_sec;
  66         v->tv_usec = t->tv_nsec / 1000;
  67 }
  68
  69 /*
  70  * Generic kernel stuff
  71  */
  72
  73 static inline unsigned long cfs_time_current(void)
  74 {
  75         return jiffies;
  76 }
  77
  78 static inline void cfs_fs_time_current(struct timespec *t)
  79 {
  80         *t = CURRENT_TIME;
  81 }
  82
  83 static inline time_t cfs_fs_time_sec(struct timespec *t)
  84 {
  85         return t->tv_sec;
  86 }
  87
  88 static inline long cfs_time_seconds(int seconds)
  89 {
  90         return ((long)seconds) * HZ;
  91 }
  92
  93 static inline time_t cfs_duration_sec(long d)
  94 {
  95         return d / HZ;
  96 }
  97
  98 static inline void cfs_duration_usec(long d, struct timeval *s)
  99 {
 100 #if (BITS_PER_LONG == 32) && (HZ > 4096)
 101         __u64 t;
 102
 103         s->tv_sec = d / HZ;
 104         t = (d - (long)s->tv_sec * HZ) * ONE_MILLION;
 105         do_div(t, HZ);
 106         s->tv_usec = t;
 107 #else
 108         s->tv_sec = d / HZ;
 109         s->tv_usec = ((d - (long)s->tv_sec * HZ) * \
 110                 ONE_MILLION) / HZ;
 111 #endif
 112 }
 113
 114 #define cfs_time_current_64 get_jiffies_64
 115
 116 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
 117 {
 118         return t + d;
 119 }
 120
 121 static inline __u64 cfs_time_shift_64(int seconds)
 122 {
 123         return cfs_time_add_64(cfs_time_current_64(),
 124                                cfs_time_seconds(seconds));
 125 }
 126
 127 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
 128 {
 129         return (__s64)t2 - (__s64)t1 > 0;
 130 }
 131
 132 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
 133 {
 134         return (__s64)t2 - (__s64)t1 >= 0;
 135 }
 136
 137 /*
 138  * One jiffy
 139  */
 140 #define CFS_TICK                (1)
 141
 142 #define CFS_TIME_T            "%lu"
 143 #define CFS_DURATION_T    "%ld"
 144
 145 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */