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 #include "portals_compat25.h"
  57
  58 /*
  59  * post 2.5 kernels.
  60  */
  61
  62 #include <linux/jiffies.h>
  63
  64
  65 static inline void cfs_fs_time_usec(struct timespec *t, struct timeval *v)
  66 {
  67         v->tv_sec  = t->tv_sec;
  68         v->tv_usec = t->tv_nsec / 1000;
  69 }
  70
  71 /*
  72  * Generic kernel stuff
  73  */
  74
  75 static inline unsigned long cfs_time_current(void)
  76 {
  77         return jiffies;
  78 }
  79
  80 static inline void cfs_fs_time_current(struct timespec *t)
  81 {
  82         *t = CURRENT_TIME;
  83 }
  84
  85 static inline time_t cfs_fs_time_sec(struct timespec *t)
  86 {
  87         return t->tv_sec;
  88 }
  89
  90 static inline long cfs_time_seconds(int seconds)
  91 {
  92         return ((long)seconds) * HZ;
  93 }
  94
  95 static inline time_t cfs_duration_sec(long d)
  96 {
  97         return d / HZ;
  98 }
  99
 100 static inline void cfs_duration_usec(long d, struct timeval *s)
 101 {
 102 #if (BITS_PER_LONG == 32) && (HZ > 4096)
 103         __u64 t;
 104
 105         s->tv_sec = d / HZ;
 106         t = (d - (long)s->tv_sec * HZ) * ONE_MILLION;
 107         do_div(t, HZ);
 108         s->tv_usec = t;
 109 #else
 110         s->tv_sec = d / HZ;
 111         s->tv_usec = ((d - (long)s->tv_sec * HZ) * \
 112                 ONE_MILLION) / HZ;
 113 #endif
 114 }
 115
 116 #define cfs_time_current_64 get_jiffies_64
 117
 118 static inline __u64 cfs_time_add_64(__u64 t, __u64 d)
 119 {
 120         return t + d;
 121 }
 122
 123 static inline __u64 cfs_time_shift_64(int seconds)
 124 {
 125         return cfs_time_add_64(cfs_time_current_64(),
 126                                cfs_time_seconds(seconds));
 127 }
 128
 129 static inline int cfs_time_before_64(__u64 t1, __u64 t2)
 130 {
 131         return (__s64)t2 - (__s64)t1 > 0;
 132 }
 133
 134 static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2)
 135 {
 136         return (__s64)t2 - (__s64)t1 >= 0;
 137 }
 138
 139 /*
 140  * One jiffy
 141  */
 142 #define CFS_TICK                (1)
 143
 144 #define CFS_TIME_T            "%lu"
 145 #define CFS_DURATION_T    "%ld"
 146
 147 #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */