| /* |
| * GPL HEADER START |
| * |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 only, |
| * as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License version 2 for more details (a copy is included |
| * in the LICENSE file that accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License |
| * version 2 along with this program; If not, see |
| * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf |
| * |
| * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| * CA 95054 USA or visit www.sun.com if you need additional information or |
| * have any questions. |
| * |
| * GPL HEADER END |
| */ |
| /* |
| * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. |
| * Use is subject to license terms. |
| */ |
| /* |
| * This file is part of Lustre, http://www.lustre.org/ |
| * Lustre is a trademark of Sun Microsystems, Inc. |
| * |
| * libcfs/include/libcfs/linux/linux-time.h |
| * |
| * Implementation of portable time API for Linux (kernel and user-level). |
| * |
| * Author: Nikita Danilov <nikita@clusterfs.com> |
| */ |
| |
| #ifndef __LIBCFS_LINUX_LINUX_TIME_H__ |
| #define __LIBCFS_LINUX_LINUX_TIME_H__ |
| |
| #ifndef __LIBCFS_LIBCFS_H__ |
| #error Do not #include this file directly. #include <linux/libcfs/libcfs.h> instead |
| #endif |
| |
| |
| /* Portable time API */ |
| |
| /* |
| * Platform provides three opaque data-types: |
| * |
| * cfs_time_t represents point in time. This is internal kernel |
| * time rather than "wall clock". This time bears no |
| * relation to gettimeofday(). |
| * |
| * cfs_duration_t represents time interval with resolution of internal |
| * platform clock |
| * |
| * cfs_fs_time_t represents instance in world-visible time. This is |
| * used in file-system time-stamps |
| * |
| * cfs_time_t cfs_time_current(void); |
| * cfs_time_t cfs_time_add (cfs_time_t, cfs_duration_t); |
| * cfs_duration_t cfs_time_sub (cfs_time_t, cfs_time_t); |
| * int cfs_impl_time_before (cfs_time_t, cfs_time_t); |
| * int cfs_impl_time_before_eq(cfs_time_t, cfs_time_t); |
| * |
| * cfs_duration_t cfs_duration_build(int64_t); |
| * |
| * time_t cfs_duration_sec (cfs_duration_t); |
| * void cfs_duration_usec(cfs_duration_t, struct timeval *); |
| * void cfs_duration_nsec(cfs_duration_t, struct timespec *); |
| * |
| * void cfs_fs_time_current(cfs_fs_time_t *); |
| * time_t cfs_fs_time_sec (cfs_fs_time_t *); |
| * void cfs_fs_time_usec (cfs_fs_time_t *, struct timeval *); |
| * void cfs_fs_time_nsec (cfs_fs_time_t *, struct timespec *); |
| * int cfs_fs_time_before (cfs_fs_time_t *, cfs_fs_time_t *); |
| * int cfs_fs_time_beforeq(cfs_fs_time_t *, cfs_fs_time_t *); |
| * |
| * CFS_TIME_FORMAT |
| * CFS_DURATION_FORMAT |
| * |
| */ |
| |
| #define ONE_BILLION ((u_int64_t)1000000000) |
| #define ONE_MILLION 1000000 |
| |
| |
| #include <linux/module.h> |
| #include <linux/kernel.h> |
| #include <linux/time.h> |
| #include <asm/div64.h> |
| |
| #include <linux/libcfs/linux/portals_compat25.h> |
| |
| /* |
| * post 2.5 kernels. |
| */ |
| |
| #include <linux/jiffies.h> |
| |
| typedef struct timespec cfs_fs_time_t; |
| |
| static inline void cfs_fs_time_usec(cfs_fs_time_t *t, struct timeval *v) |
| { |
| v->tv_sec = t->tv_sec; |
| v->tv_usec = t->tv_nsec / 1000; |
| } |
| |
| static inline void cfs_fs_time_nsec(cfs_fs_time_t *t, struct timespec *s) |
| { |
| *s = *t; |
| } |
| |
| /* |
| * internal helper function used by cfs_fs_time_before*() |
| */ |
| static inline unsigned long long __cfs_fs_time_flat(cfs_fs_time_t *t) |
| { |
| return (unsigned long long)t->tv_sec * ONE_BILLION + t->tv_nsec; |
| } |
| |
| |
| /* |
| * Generic kernel stuff |
| */ |
| |
| typedef unsigned long cfs_time_t; /* jiffies */ |
| typedef long cfs_duration_t; |
| typedef cycles_t cfs_cycles_t; |
| |
| static inline int cfs_time_before(cfs_time_t t1, cfs_time_t t2) |
| { |
| return time_before(t1, t2); |
| } |
| |
| static inline int cfs_time_beforeq(cfs_time_t t1, cfs_time_t t2) |
| { |
| return time_before_eq(t1, t2); |
| } |
| |
| static inline cfs_time_t cfs_time_current(void) |
| { |
| return jiffies; |
| } |
| |
| static inline time_t cfs_time_current_sec(void) |
| { |
| return get_seconds(); |
| } |
| |
| static inline void cfs_fs_time_current(cfs_fs_time_t *t) |
| { |
| *t = CURRENT_TIME; |
| } |
| |
| static inline time_t cfs_fs_time_sec(cfs_fs_time_t *t) |
| { |
| return t->tv_sec; |
| } |
| |
| static inline int cfs_fs_time_before(cfs_fs_time_t *t1, cfs_fs_time_t *t2) |
| { |
| return __cfs_fs_time_flat(t1) < __cfs_fs_time_flat(t2); |
| } |
| |
| static inline int cfs_fs_time_beforeq(cfs_fs_time_t *t1, cfs_fs_time_t *t2) |
| { |
| return __cfs_fs_time_flat(t1) <= __cfs_fs_time_flat(t2); |
| } |
| |
| #if 0 |
| static inline cfs_duration_t cfs_duration_build(int64_t nano) |
| { |
| #if (BITS_PER_LONG == 32) |
| /* We cannot use do_div(t, ONE_BILLION), do_div can only process |
| * 64 bits n and 32 bits base */ |
| int64_t t = nano * HZ; |
| do_div(t, 1000); |
| do_div(t, 1000000); |
| return (cfs_duration_t)t; |
| #else |
| return (nano * HZ / ONE_BILLION); |
| #endif |
| } |
| #endif |
| |
| static inline cfs_duration_t cfs_time_seconds(int seconds) |
| { |
| return ((cfs_duration_t)seconds) * HZ; |
| } |
| |
| static inline time_t cfs_duration_sec(cfs_duration_t d) |
| { |
| return d / HZ; |
| } |
| |
| static inline void cfs_duration_usec(cfs_duration_t d, struct timeval *s) |
| { |
| #if (BITS_PER_LONG == 32) && (HZ > 4096) |
| __u64 t; |
| |
| s->tv_sec = d / HZ; |
| t = (d - (cfs_duration_t)s->tv_sec * HZ) * ONE_MILLION; |
| do_div(t, HZ); |
| s->tv_usec = t; |
| #else |
| s->tv_sec = d / HZ; |
| s->tv_usec = ((d - (cfs_duration_t)s->tv_sec * HZ) * \ |
| ONE_MILLION) / HZ; |
| #endif |
| } |
| |
| static inline void cfs_duration_nsec(cfs_duration_t d, struct timespec *s) |
| { |
| #if (BITS_PER_LONG == 32) |
| __u64 t; |
| |
| s->tv_sec = d / HZ; |
| t = (d - s->tv_sec * HZ) * ONE_BILLION; |
| do_div(t, HZ); |
| s->tv_nsec = t; |
| #else |
| s->tv_sec = d / HZ; |
| s->tv_nsec = ((d - s->tv_sec * HZ) * ONE_BILLION) / HZ; |
| #endif |
| } |
| |
| #define cfs_time_current_64 get_jiffies_64 |
| |
| static inline __u64 cfs_time_add_64(__u64 t, __u64 d) |
| { |
| return t + d; |
| } |
| |
| static inline __u64 cfs_time_shift_64(int seconds) |
| { |
| return cfs_time_add_64(cfs_time_current_64(), |
| cfs_time_seconds(seconds)); |
| } |
| |
| static inline int cfs_time_before_64(__u64 t1, __u64 t2) |
| { |
| return (__s64)t2 - (__s64)t1 > 0; |
| } |
| |
| static inline int cfs_time_beforeq_64(__u64 t1, __u64 t2) |
| { |
| return (__s64)t2 - (__s64)t1 >= 0; |
| } |
| |
| |
| /* |
| * One jiffy |
| */ |
| #define CFS_TICK (1) |
| |
| #define CFS_TIME_T "%lu" |
| #define CFS_DURATION_T "%ld" |
| |
| |
| #endif /* __LIBCFS_LINUX_LINUX_TIME_H__ */ |
| /* |
| * Local variables: |
| * c-indentation-style: "K&R" |
| * c-basic-offset: 8 |
| * tab-width: 8 |
| * fill-column: 80 |
| * scroll-step: 1 |
| * End: |
| */ |