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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,
82 if (unlikely(CFS_FAIL_PRECHECK(id) &&
83 (ret = __cfs_fail_check_set(id, value, set)))) {
85 CDEBUG(D_INFO, "*** cfs_fail_loc=%x, val=%u***\n",
88 LCONSOLE_INFO("*** cfs_fail_loc=%x, val=%u***\n",
96 /* If id hit cfs_fail_loc, return 1, otherwise return 0 */
97 #define CFS_FAIL_CHECK(id) \
98 cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET, 0)
99 #define CFS_FAIL_CHECK_QUIET(id) \
100 cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET, 1)
102 /* If id hit cfs_fail_loc and cfs_fail_val == (-1 or value) return 1,
103 * otherwise return 0 */
104 #define CFS_FAIL_CHECK_VALUE(id, value) \
105 cfs_fail_check_set(id, value, CFS_FAIL_LOC_VALUE, 0)
106 #define CFS_FAIL_CHECK_VALUE_QUIET(id, value) \
107 cfs_fail_check_set(id, value, CFS_FAIL_LOC_VALUE, 1)
109 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and return 1,
110 * otherwise return 0 */
111 #define CFS_FAIL_CHECK_ORSET(id, value) \
112 cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET, 0)
113 #define CFS_FAIL_CHECK_ORSET_QUIET(id, value) \
114 cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET, 1)
116 /* If id hit cfs_fail_loc, cfs_fail_loc = value and return 1,
117 * otherwise return 0 */
118 #define CFS_FAIL_CHECK_RESET(id, value) \
119 cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET, 0)
120 #define CFS_FAIL_CHECK_RESET_QUIET(id, value) \
121 cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET, 1)
123 static inline int cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
125 if (unlikely(CFS_FAIL_PRECHECK(id)))
126 return __cfs_fail_timeout_set(id, value, ms, set);
131 /* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
132 #define CFS_FAIL_TIMEOUT(id, secs) \
133 cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
135 #define CFS_FAIL_TIMEOUT_MS(id, ms) \
136 cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
138 /* If id hit cfs_fail_loc, cfs_fail_loc |= value and
139 * sleep seconds or milliseconds */
140 #define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
141 cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
143 #define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
144 cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
147 /* The idea here is to synchronise two threads to force a race. The
148 * first thread that calls this with a matching fail_loc is put to
149 * sleep. The next thread that calls with the same fail_loc wakes up
150 * the first and continues. */
151 static inline void cfs_race(__u32 id)
154 if (CFS_FAIL_PRECHECK(id)) {
155 if (unlikely(__cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET))) {
158 CERROR("cfs_race id %x sleeping\n", id);
159 cfs_wait_event_interruptible(cfs_race_waitq,
160 cfs_race_state != 0, rc);
161 CERROR("cfs_fail_race id %x awake, rc=%d\n", id, rc);
163 CERROR("cfs_fail_race id %x waking\n", id);
165 cfs_waitq_signal(&cfs_race_waitq);
169 #define CFS_RACE(id) cfs_race(id)
171 /* sigh. an expedient fix until CFS_RACE is fixed up */
172 #define CFS_RACE(foo) do {} while(0)
175 #endif /* _LIBCFS_FAIL_H */