1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
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19 * version 2 along with this program; If not, see http://www.gnu.org/licenses
21 * Please contact Oracle Corporation, Inc., 500 Oracle Parkway, Redwood Shores,
22 * CA 94065 USA or visit www.oracle.com if you need additional information or
28 * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
29 * Use is subject to license terms.
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36 #ifndef _LIBCFS_FAIL_H
37 #define _LIBCFS_FAIL_H
39 extern unsigned long cfs_fail_loc;
40 extern unsigned int cfs_fail_val;
42 extern cfs_waitq_t cfs_race_waitq;
43 extern int cfs_race_state;
45 int __cfs_fail_check_set(__u32 id, __u32 value, int set);
46 int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set);
49 CFS_FAIL_LOC_NOSET = 0,
50 CFS_FAIL_LOC_ORSET = 1,
51 CFS_FAIL_LOC_RESET = 2
54 /* Failure injection control */
55 #define CFS_FAIL_MASK_SYS 0x0000FF00
56 #define CFS_FAIL_MASK_LOC (0x000000FF | CFS_FAIL_MASK_SYS)
58 #define CFS_FAILED_BIT 30
59 /* CFS_FAILED is 0x40000000 */
60 #define CFS_FAILED (1 << CFS_FAILED_BIT)
62 #define CFS_FAIL_ONCE_BIT 31
63 /* CFS_FAIL_ONCE is 0x80000000 */
64 #define CFS_FAIL_ONCE (1 << CFS_FAIL_ONCE_BIT)
66 /* The following flags aren't made to be combined */
67 #define CFS_FAIL_SKIP 0x20000000 /* skip N times then fail */
68 #define CFS_FAIL_SOME 0x10000000 /* only fail N times */
69 #define CFS_FAIL_RAND 0x08000000 /* fail 1/N of the times */
70 #define CFS_FAIL_USR1 0x04000000 /* user flag */
72 #define CFS_FAIL_PRECHECK(id) (cfs_fail_loc && \
73 (cfs_fail_loc & CFS_FAIL_MASK_LOC) == \
74 ((id) & CFS_FAIL_MASK_LOC))
76 static inline int cfs_fail_check_set(__u32 id, __u32 value, int set)
79 if (unlikely(CFS_FAIL_PRECHECK(id) &&
80 (ret = __cfs_fail_check_set(id, value, set)))) {
81 CERROR("*** cfs_fail_loc=%x ***\n", id);
86 /* If id hit cfs_fail_loc, return 1, otherwise return 0 */
87 #define CFS_FAIL_CHECK(id) \
88 cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET)
90 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and return 1,
91 * otherwise return 0 */
92 #define CFS_FAIL_CHECK_ORSET(id, value) \
93 cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET)
95 /* If id hit cfs_fail_loc, cfs_fail_loc = value and return 1,
96 * otherwise return 0 */
97 #define CFS_FAIL_CHECK_RESET(id, value) \
98 cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET)
100 static inline int cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
102 if (unlikely(CFS_FAIL_PRECHECK(id)))
103 return __cfs_fail_timeout_set(id, value, ms, set);
108 /* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
109 #define CFS_FAIL_TIMEOUT(id, secs) \
110 cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
112 #define CFS_FAIL_TIMEOUT_MS(id, ms) \
113 cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
115 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and
116 * sleep seconds or milliseconds */
117 #define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
118 cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
120 #define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
121 cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
124 /* The idea here is to synchronise two threads to force a race. The
125 * first thread that calls this with a matching fail_loc is put to
126 * sleep. The next thread that calls with the same fail_loc wakes up
127 * the first and continues. */
128 static inline void cfs_race(__u32 id)
132 if (CFS_FAIL_PRECHECK(id)) {
133 if (unlikely(__cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET))) {
135 CERROR("cfs_race id %x sleeping\n", id);
136 cfs_wait_event_interruptible(cfs_race_waitq, cfs_race_state != 0, rc);
137 CERROR("cfs_fail_race id %x awake\n", id);
139 CERROR("cfs_fail_race id %x waking\n", id);
141 cfs_waitq_signal(&cfs_race_waitq);
145 #define CFS_RACE(id) cfs_race(id)
147 /* sigh. an expedient fix until CFS_RACE is fixed up */
148 #define CFS_RACE(foo) do {} while(0)
151 #endif /* _LIBCFS_FAIL_H */