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/libcfs_time.h
35 *
36 * Time functions.
37 *
38 */
39
40 #ifndef __LIBCFS_TIME_H__
41 #define __LIBCFS_TIME_H__
42 /*
43 * generic time manipulation functions.
44 */
45
cfs_time_add(unsigned long t,long d)46 static inline unsigned long cfs_time_add(unsigned long t, long d)
47 {
48 return (unsigned long)(t + d);
49 }
50
cfs_time_sub(unsigned long t1,unsigned long t2)51 static inline unsigned long cfs_time_sub(unsigned long t1, unsigned long t2)
52 {
53 return (unsigned long)(t1 - t2);
54 }
55
cfs_time_after(unsigned long t1,unsigned long t2)56 static inline int cfs_time_after(unsigned long t1, unsigned long t2)
57 {
58 return time_before(t2, t1);
59 }
60
cfs_time_aftereq(unsigned long t1,unsigned long t2)61 static inline int cfs_time_aftereq(unsigned long t1, unsigned long t2)
62 {
63 return time_before_eq(t2, t1);
64 }
65
cfs_time_shift(int seconds)66 static inline unsigned long cfs_time_shift(int seconds)
67 {
68 return cfs_time_add(cfs_time_current(), cfs_time_seconds(seconds));
69 }
70
cfs_timeval_sub(struct timeval * large,struct timeval * small,struct timeval * result)71 static inline long cfs_timeval_sub(struct timeval *large, struct timeval *small,
72 struct timeval *result)
73 {
74 long r = (long)(
75 (large->tv_sec - small->tv_sec) * ONE_MILLION +
76 (large->tv_usec - small->tv_usec));
77 if (result != NULL) {
78 result->tv_usec = r % ONE_MILLION;
79 result->tv_sec = r / ONE_MILLION;
80 }
81 return r;
82 }
83
cfs_slow_warning(unsigned long now,int seconds,char * msg)84 static inline void cfs_slow_warning(unsigned long now, int seconds, char *msg)
85 {
86 if (cfs_time_after(cfs_time_current(),
87 cfs_time_add(now, cfs_time_seconds(15))))
88 CERROR("slow %s "CFS_TIME_T" sec\n", msg,
89 cfs_duration_sec(cfs_time_sub(cfs_time_current(), now)));
90 }
91
92 #define CFS_RATELIMIT(seconds) \
93 ({ \
94 /* \
95 * XXX nikita: non-portable initializer \
96 */ \
97 static time_t __next_message; \
98 int result; \
99 \
100 if (cfs_time_after(cfs_time_current(), __next_message)) \
101 result = 1; \
102 else { \
103 __next_message = cfs_time_shift(seconds); \
104 result = 0; \
105 } \
106 result; \
107 })
108
109 /*
110 * helper function similar to do_gettimeofday() of Linux kernel
111 */
cfs_fs_timeval(struct timeval * tv)112 static inline void cfs_fs_timeval(struct timeval *tv)
113 {
114 struct timespec time;
115
116 cfs_fs_time_current(&time);
117 cfs_fs_time_usec(&time, tv);
118 }
119
120 /*
121 * return valid time-out based on user supplied one. Currently we only check
122 * that time-out is not shorted than allowed.
123 */
cfs_timeout_cap(long timeout)124 static inline long cfs_timeout_cap(long timeout)
125 {
126 if (timeout < CFS_TICK)
127 timeout = CFS_TICK;
128 return timeout;
129 }
130
131 #endif
132