191 lines
5.5 KiB
C
191 lines
5.5 KiB
C
/*
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* GPL HEADER START
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*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 only,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License version 2 for more details (a copy is included
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* in the LICENSE file that accompanied this code).
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; If not, see http://www.gnu.org/licenses
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*
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* GPL HEADER END
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*/
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/*
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* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
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* Use is subject to license terms.
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*
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* Copyright (c) 2011, 2012, Intel Corporation.
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*/
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/*
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* This file is part of Lustre, http://www.lustre.org/
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* Lustre is a trademark of Oracle Corporation, Inc.
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*/
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#ifndef _LIBCFS_FAIL_H
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#define _LIBCFS_FAIL_H
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extern unsigned long cfs_fail_loc;
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extern unsigned int cfs_fail_val;
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extern int cfs_fail_err;
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extern wait_queue_head_t cfs_race_waitq;
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extern int cfs_race_state;
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int __cfs_fail_check_set(u32 id, u32 value, int set);
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int __cfs_fail_timeout_set(u32 id, u32 value, int ms, int set);
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enum {
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CFS_FAIL_LOC_NOSET = 0,
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CFS_FAIL_LOC_ORSET = 1,
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CFS_FAIL_LOC_RESET = 2,
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CFS_FAIL_LOC_VALUE = 3
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};
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/* Failure injection control */
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#define CFS_FAIL_MASK_SYS 0x0000FF00
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#define CFS_FAIL_MASK_LOC (0x000000FF | CFS_FAIL_MASK_SYS)
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#define CFS_FAILED_BIT 30
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/* CFS_FAILED is 0x40000000 */
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#define CFS_FAILED BIT(CFS_FAILED_BIT)
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#define CFS_FAIL_ONCE_BIT 31
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/* CFS_FAIL_ONCE is 0x80000000 */
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#define CFS_FAIL_ONCE BIT(CFS_FAIL_ONCE_BIT)
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/* The following flags aren't made to be combined */
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#define CFS_FAIL_SKIP 0x20000000 /* skip N times then fail */
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#define CFS_FAIL_SOME 0x10000000 /* only fail N times */
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#define CFS_FAIL_RAND 0x08000000 /* fail 1/N of the times */
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#define CFS_FAIL_USR1 0x04000000 /* user flag */
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#define CFS_FAULT 0x02000000 /* match any CFS_FAULT_CHECK */
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static inline bool CFS_FAIL_PRECHECK(u32 id)
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{
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return cfs_fail_loc &&
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((cfs_fail_loc & CFS_FAIL_MASK_LOC) == (id & CFS_FAIL_MASK_LOC) ||
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(cfs_fail_loc & id & CFS_FAULT));
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}
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static inline int cfs_fail_check_set(u32 id, u32 value,
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int set, int quiet)
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{
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int ret = 0;
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if (unlikely(CFS_FAIL_PRECHECK(id))) {
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ret = __cfs_fail_check_set(id, value, set);
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if (ret) {
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if (quiet) {
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CDEBUG(D_INFO, "*** cfs_fail_loc=%x, val=%u***\n",
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id, value);
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} else {
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LCONSOLE_INFO("*** cfs_fail_loc=%x, val=%u***\n",
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id, value);
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}
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}
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}
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return ret;
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}
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/* If id hit cfs_fail_loc, return 1, otherwise return 0 */
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#define CFS_FAIL_CHECK(id) \
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cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET, 0)
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#define CFS_FAIL_CHECK_QUIET(id) \
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cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET, 1)
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/*
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* If id hit cfs_fail_loc and cfs_fail_val == (-1 or value) return 1,
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* otherwise return 0
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*/
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#define CFS_FAIL_CHECK_VALUE(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_VALUE, 0)
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#define CFS_FAIL_CHECK_VALUE_QUIET(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_VALUE, 1)
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/*
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* If id hit cfs_fail_loc, cfs_fail_loc |= value and return 1,
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* otherwise return 0
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*/
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#define CFS_FAIL_CHECK_ORSET(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET, 0)
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#define CFS_FAIL_CHECK_ORSET_QUIET(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET, 1)
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/*
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* If id hit cfs_fail_loc, cfs_fail_loc = value and return 1,
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* otherwise return 0
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*/
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#define CFS_FAIL_CHECK_RESET(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET, 0)
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#define CFS_FAIL_CHECK_RESET_QUIET(id, value) \
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cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET, 1)
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static inline int cfs_fail_timeout_set(u32 id, u32 value, int ms, int set)
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{
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if (unlikely(CFS_FAIL_PRECHECK(id)))
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return __cfs_fail_timeout_set(id, value, ms, set);
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return 0;
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}
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/* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
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#define CFS_FAIL_TIMEOUT(id, secs) \
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cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
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#define CFS_FAIL_TIMEOUT_MS(id, ms) \
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cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
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/*
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* If id hit cfs_fail_loc, cfs_fail_loc |= value and
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* sleep seconds or milliseconds
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*/
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#define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
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cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
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#define CFS_FAIL_TIMEOUT_RESET(id, value, secs) \
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cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_RESET)
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#define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
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cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
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#define CFS_FAULT_CHECK(id) \
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CFS_FAIL_CHECK(CFS_FAULT | (id))
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/*
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* The idea here is to synchronise two threads to force a race. The
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* first thread that calls this with a matching fail_loc is put to
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* sleep. The next thread that calls with the same fail_loc wakes up
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* the first and continues.
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*/
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static inline void cfs_race(u32 id)
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{
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if (CFS_FAIL_PRECHECK(id)) {
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if (unlikely(__cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET))) {
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int rc;
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cfs_race_state = 0;
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CERROR("cfs_race id %x sleeping\n", id);
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rc = wait_event_interruptible(cfs_race_waitq,
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!!cfs_race_state);
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CERROR("cfs_fail_race id %x awake, rc=%d\n", id, rc);
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} else {
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CERROR("cfs_fail_race id %x waking\n", id);
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cfs_race_state = 1;
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wake_up(&cfs_race_waitq);
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}
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}
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}
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#define CFS_RACE(id) cfs_race(id)
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#endif /* _LIBCFS_FAIL_H */
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