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.
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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,
52 CFS_FAIL_LOC_VALUE = 3
55 /* Failure injection control */
56 #define CFS_FAIL_MASK_SYS 0x0000FF00
57 #define CFS_FAIL_MASK_LOC (0x000000FF | CFS_FAIL_MASK_SYS)
59 #define CFS_FAILED_BIT 30
60 /* CFS_FAILED is 0x40000000 */
61 #define CFS_FAILED (1 << CFS_FAILED_BIT)
63 #define CFS_FAIL_ONCE_BIT 31
64 /* CFS_FAIL_ONCE is 0x80000000 */
65 #define CFS_FAIL_ONCE (1 << CFS_FAIL_ONCE_BIT)
67 /* The following flags aren't made to be combined */
68 #define CFS_FAIL_SKIP 0x20000000 /* skip N times then fail */
69 #define CFS_FAIL_SOME 0x10000000 /* only fail N times */
70 #define CFS_FAIL_RAND 0x08000000 /* fail 1/N of the times */
71 #define CFS_FAIL_USR1 0x04000000 /* user flag */
73 #define CFS_FAIL_PRECHECK(id) (cfs_fail_loc && \
74 (cfs_fail_loc & CFS_FAIL_MASK_LOC) == \
75 ((id) & CFS_FAIL_MASK_LOC))
77 static inline int cfs_fail_check_set(__u32 id, __u32 value, int set)
80 if (unlikely(CFS_FAIL_PRECHECK(id) &&
81 (ret = __cfs_fail_check_set(id, value, set)))) {
82 CERROR("*** cfs_fail_loc=%x ***\n", id);
87 /* If id hit cfs_fail_loc, return 1, otherwise return 0 */
88 #define CFS_FAIL_CHECK(id) \
89 cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET)
91 /* If id hit cfs_fail_loc and cfs_fail_val == (-1 or value) return 1,
92 * otherwise return 0 */
93 #define CFS_FAIL_CHECK_VALUE(id, value) \
94 cfs_fail_check_set(id, value, CFS_FAIL_LOC_VALUE)
96 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and return 1,
97 * otherwise return 0 */
98 #define CFS_FAIL_CHECK_ORSET(id, value) \
99 cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET)
101 /* If id hit cfs_fail_loc, cfs_fail_loc = value and return 1,
102 * otherwise return 0 */
103 #define CFS_FAIL_CHECK_RESET(id, value) \
104 cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET)
106 static inline int cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
108 if (unlikely(CFS_FAIL_PRECHECK(id)))
109 return __cfs_fail_timeout_set(id, value, ms, set);
114 /* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
115 #define CFS_FAIL_TIMEOUT(id, secs) \
116 cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
118 #define CFS_FAIL_TIMEOUT_MS(id, ms) \
119 cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
121 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and
122 * sleep seconds or milliseconds */
123 #define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
124 cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
126 #define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
127 cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
130 /* The idea here is to synchronise two threads to force a race. The
131 * first thread that calls this with a matching fail_loc is put to
132 * sleep. The next thread that calls with the same fail_loc wakes up
133 * the first and continues. */
134 static inline void cfs_race(__u32 id)
137 if (CFS_FAIL_PRECHECK(id)) {
138 if (unlikely(__cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET))) {
141 CERROR("cfs_race id %x sleeping\n", id);
142 cfs_wait_event_interruptible(cfs_race_waitq,
143 cfs_race_state != 0, rc);
144 CERROR("cfs_fail_race id %x awake, rc=%d\n", id, rc);
146 CERROR("cfs_fail_race id %x waking\n", id);
148 cfs_waitq_signal(&cfs_race_waitq);
152 #define CFS_RACE(id) cfs_race(id)
154 /* sigh. an expedient fix until CFS_RACE is fixed up */
155 #define CFS_RACE(foo) do {} while(0)
158 #endif /* _LIBCFS_FAIL_H */