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d7e09d03 PT |
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 http://www.gnu.org/licenses | |
18 | * | |
19 | * Please contact Oracle Corporation, Inc., 500 Oracle Parkway, Redwood Shores, | |
20 | * CA 94065 USA or visit www.oracle.com if you need additional information or | |
21 | * have any questions. | |
22 | * | |
23 | * GPL HEADER END | |
24 | */ | |
25 | /* | |
26 | * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved. | |
27 | * Use is subject to license terms. | |
28 | * | |
29 | * Copyright (c) 2011, 2012, Intel Corporation. | |
30 | */ | |
31 | /* | |
32 | * This file is part of Lustre, http://www.lustre.org/ | |
33 | * Lustre is a trademark of Oracle Corporation, Inc. | |
34 | */ | |
35 | ||
9fdaf8c0 | 36 | #include "../../include/linux/libcfs/libcfs.h" |
d7e09d03 PT |
37 | |
38 | unsigned long cfs_fail_loc = 0; | |
d7e09d03 | 39 | EXPORT_SYMBOL(cfs_fail_loc); |
0d2f6bb4 AB |
40 | |
41 | unsigned int cfs_fail_val = 0; | |
d7e09d03 | 42 | EXPORT_SYMBOL(cfs_fail_val); |
0d2f6bb4 AB |
43 | |
44 | wait_queue_head_t cfs_race_waitq; | |
d7e09d03 | 45 | EXPORT_SYMBOL(cfs_race_waitq); |
0d2f6bb4 AB |
46 | |
47 | int cfs_race_state; | |
d7e09d03 PT |
48 | EXPORT_SYMBOL(cfs_race_state); |
49 | ||
50 | int __cfs_fail_check_set(__u32 id, __u32 value, int set) | |
51 | { | |
52 | static atomic_t cfs_fail_count = ATOMIC_INIT(0); | |
53 | ||
54 | LASSERT(!(id & CFS_FAIL_ONCE)); | |
55 | ||
56 | if ((cfs_fail_loc & (CFS_FAILED | CFS_FAIL_ONCE)) == | |
57 | (CFS_FAILED | CFS_FAIL_ONCE)) { | |
58 | atomic_set(&cfs_fail_count, 0); /* paranoia */ | |
59 | return 0; | |
60 | } | |
61 | ||
62 | /* Fail 1/cfs_fail_val times */ | |
63 | if (cfs_fail_loc & CFS_FAIL_RAND) { | |
64 | if (cfs_fail_val < 2 || cfs_rand() % cfs_fail_val > 0) | |
65 | return 0; | |
66 | } | |
67 | ||
68 | /* Skip the first cfs_fail_val, then fail */ | |
69 | if (cfs_fail_loc & CFS_FAIL_SKIP) { | |
70 | if (atomic_inc_return(&cfs_fail_count) <= cfs_fail_val) | |
71 | return 0; | |
72 | } | |
73 | ||
74 | /* check cfs_fail_val... */ | |
75 | if (set == CFS_FAIL_LOC_VALUE) { | |
76 | if (cfs_fail_val != -1 && cfs_fail_val != value) | |
77 | return 0; | |
78 | } | |
79 | ||
80 | /* Fail cfs_fail_val times, overridden by FAIL_ONCE */ | |
81 | if (cfs_fail_loc & CFS_FAIL_SOME && | |
82 | (!(cfs_fail_loc & CFS_FAIL_ONCE) || cfs_fail_val <= 1)) { | |
83 | int count = atomic_inc_return(&cfs_fail_count); | |
84 | ||
85 | if (count >= cfs_fail_val) { | |
86 | set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc); | |
87 | atomic_set(&cfs_fail_count, 0); | |
88 | /* we are lost race to increase */ | |
89 | if (count > cfs_fail_val) | |
90 | return 0; | |
91 | } | |
92 | } | |
93 | ||
94 | if ((set == CFS_FAIL_LOC_ORSET || set == CFS_FAIL_LOC_RESET) && | |
95 | (value & CFS_FAIL_ONCE)) | |
96 | set_bit(CFS_FAIL_ONCE_BIT, &cfs_fail_loc); | |
97 | /* Lost race to set CFS_FAILED_BIT. */ | |
98 | if (test_and_set_bit(CFS_FAILED_BIT, &cfs_fail_loc)) { | |
99 | /* If CFS_FAIL_ONCE is valid, only one process can fail, | |
100 | * otherwise multi-process can fail at the same time. */ | |
101 | if (cfs_fail_loc & CFS_FAIL_ONCE) | |
102 | return 0; | |
103 | } | |
104 | ||
105 | switch (set) { | |
464289d8 TR |
106 | case CFS_FAIL_LOC_NOSET: |
107 | case CFS_FAIL_LOC_VALUE: | |
108 | break; | |
109 | case CFS_FAIL_LOC_ORSET: | |
110 | cfs_fail_loc |= value & ~(CFS_FAILED | CFS_FAIL_ONCE); | |
111 | break; | |
112 | case CFS_FAIL_LOC_RESET: | |
113 | cfs_fail_loc = value; | |
114 | break; | |
115 | default: | |
116 | LASSERTF(0, "called with bad set %u\n", set); | |
117 | break; | |
d7e09d03 PT |
118 | } |
119 | ||
120 | return 1; | |
121 | } | |
122 | EXPORT_SYMBOL(__cfs_fail_check_set); | |
123 | ||
124 | int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set) | |
125 | { | |
126 | int ret = 0; | |
127 | ||
128 | ret = __cfs_fail_check_set(id, value, set); | |
129 | if (ret) { | |
130 | CERROR("cfs_fail_timeout id %x sleeping for %dms\n", | |
131 | id, ms); | |
18fd5baa PT |
132 | set_current_state(TASK_UNINTERRUPTIBLE); |
133 | schedule_timeout(cfs_time_seconds(ms) / 1000); | |
d7e09d03 PT |
134 | CERROR("cfs_fail_timeout id %x awake\n", id); |
135 | } | |
136 | return ret; | |
137 | } | |
138 | EXPORT_SYMBOL(__cfs_fail_timeout_set); |