4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
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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).
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26 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
27 * Use is subject to license terms.
29 * Copyright (c) 2012, Whamcloud, Inc.
32 * This file is part of Lustre, http://www.lustre.org/
33 * Lustre is a trademark of Oracle Corporation, Inc.
37 #include <liblustre.h>
39 #include <libcfs/libcfs.h>
42 unsigned long cfs_fail_loc = 0;
43 unsigned int cfs_fail_val = 0;
44 cfs_waitq_t cfs_race_waitq;
47 CFS_EXPORT_SYMBOL(cfs_fail_loc);
48 CFS_EXPORT_SYMBOL(cfs_fail_val);
49 CFS_EXPORT_SYMBOL(cfs_race_waitq);
50 CFS_EXPORT_SYMBOL(cfs_race_state);
52 int __cfs_fail_check_set(__u32 id, __u32 value, int set)
54 static cfs_atomic_t cfs_fail_count = CFS_ATOMIC_INIT(0);
56 LASSERT(!(id & CFS_FAIL_ONCE));
58 if ((cfs_fail_loc & (CFS_FAILED | CFS_FAIL_ONCE)) ==
59 (CFS_FAILED | CFS_FAIL_ONCE)) {
60 cfs_atomic_set(&cfs_fail_count, 0); /* paranoia */
64 /* Fail 1/cfs_fail_val times */
65 if (cfs_fail_loc & CFS_FAIL_RAND) {
66 if (cfs_fail_val < 2 || cfs_rand() % cfs_fail_val > 0)
70 /* Skip the first cfs_fail_val, then fail */
71 if (cfs_fail_loc & CFS_FAIL_SKIP) {
72 if (cfs_atomic_inc_return(&cfs_fail_count) <= cfs_fail_val)
76 /* check cfs_fail_val... */
77 if (set == CFS_FAIL_LOC_VALUE) {
78 if (cfs_fail_val != -1 && cfs_fail_val != value)
82 /* Fail cfs_fail_val times, overridden by FAIL_ONCE */
83 if (cfs_fail_loc & CFS_FAIL_SOME &&
84 (!(cfs_fail_loc & CFS_FAIL_ONCE) || cfs_fail_val <= 1)) {
85 int count = cfs_atomic_inc_return(&cfs_fail_count);
87 if (count >= cfs_fail_val) {
88 set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
89 cfs_atomic_set(&cfs_fail_count, 0);
90 /* we are lost race to increase */
91 if (count > cfs_fail_val)
96 if ((set == CFS_FAIL_LOC_ORSET || set == CFS_FAIL_LOC_RESET) &&
97 (value & CFS_FAIL_ONCE))
98 set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc);
99 /* Lost race to set CFS_FAILED_BIT. */
100 if (test_and_set_bit(CFS_FAILED_BIT, &cfs_fail_loc)) {
101 /* If CFS_FAIL_ONCE is valid, only one process can fail,
102 * otherwise multi-process can fail at the same time. */
103 if (cfs_fail_loc & CFS_FAIL_ONCE)
108 case CFS_FAIL_LOC_NOSET:
109 case CFS_FAIL_LOC_VALUE:
111 case CFS_FAIL_LOC_ORSET:
112 cfs_fail_loc |= value & ~(CFS_FAILED | CFS_FAIL_ONCE);
114 case CFS_FAIL_LOC_RESET:
115 cfs_fail_loc = value;
118 LASSERTF(0, "called with bad set %u\n", set);
124 CFS_EXPORT_SYMBOL(__cfs_fail_check_set);
126 int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
130 ret = __cfs_fail_check_set(id, value, set);
132 CERROR("cfs_fail_timeout id %x sleeping for %dms\n",
134 cfs_schedule_timeout_and_set_state(CFS_TASK_UNINT,
135 cfs_time_seconds(ms) / 1000);
136 cfs_set_current_state(CFS_TASK_RUNNING);
137 CERROR("cfs_fail_timeout id %x awake\n", id);
141 CFS_EXPORT_SYMBOL(__cfs_fail_timeout_set);