+/* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
+ * vim:expandtab:shiftwidth=8:tabstop=8:
+ *
+ * GPL HEADER START
+ *
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 only,
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License version 2 for more details (a copy is included
+ * in the LICENSE file that accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License
+ * version 2 along with this program; If not, see http://www.gnu.org/licenses
+ *
+ * Please contact Oracle Corporation, Inc., 500 Oracle Parkway, Redwood Shores,
+ * CA 94065 USA or visit www.oracle.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Oracle Corporation, Inc.
+ */
+
+#ifndef _LIBCFS_FAIL_H
+#define _LIBCFS_FAIL_H
+
+extern unsigned long cfs_fail_loc;
+extern unsigned int cfs_fail_val;
+
+extern cfs_waitq_t cfs_race_waitq;
+extern int cfs_race_state;
+
+int __cfs_fail_check_set(__u32 id, __u32 value, int set);
+int __cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set);
+
+enum {
+ CFS_FAIL_LOC_NOSET = 0,
+ CFS_FAIL_LOC_ORSET = 1,
+ CFS_FAIL_LOC_RESET = 2
+};
+
+/* Failure injection control */
+#define CFS_FAIL_MASK_SYS 0x0000FF00
+#define CFS_FAIL_MASK_LOC (0x000000FF | CFS_FAIL_MASK_SYS)
+
+#define CFS_FAILED_BIT 30
+/* CFS_FAILED is 0x40000000 */
+#define CFS_FAILED (1 << CFS_FAILED_BIT)
+
+#define CFS_FAIL_ONCE_BIT 31
+/* CFS_FAIL_ONCE is 0x80000000 */
+#define CFS_FAIL_ONCE (1 << CFS_FAIL_ONCE_BIT)
+
+/* The following flags aren't made to be combined */
+#define CFS_FAIL_SKIP 0x20000000 /* skip N times then fail */
+#define CFS_FAIL_SOME 0x10000000 /* only fail N times */
+#define CFS_FAIL_RAND 0x08000000 /* fail 1/N of the times */
+#define CFS_FAIL_USR1 0x04000000 /* user flag */
+
+#define CFS_FAIL_PRECHECK(id) (cfs_fail_loc && \
+ (cfs_fail_loc & CFS_FAIL_MASK_LOC) == \
+ ((id) & CFS_FAIL_MASK_LOC))
+
+static inline int cfs_fail_check_set(__u32 id, __u32 value, int set)
+{
+ int ret = 0;
+ if (unlikely(CFS_FAIL_PRECHECK(id) &&
+ (ret = __cfs_fail_check_set(id, value, set)))) {
+ CERROR("*** cfs_fail_loc=%x ***\n", id);
+ }
+ return ret;
+}
+
+/* If id hit cfs_fail_loc, return 1, otherwise return 0 */
+#define CFS_FAIL_CHECK(id) \
+ cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET)
+
+/* If id hit cfs_fail_loc, cfs_fail_loc |= value and return 1,
+ * otherwise return 0 */
+#define CFS_FAIL_CHECK_ORSET(id, value) \
+ cfs_fail_check_set(id, value, CFS_FAIL_LOC_ORSET)
+
+/* If id hit cfs_fail_loc, cfs_fail_loc = value and return 1,
+ * otherwise return 0 */
+#define CFS_FAIL_CHECK_RESET(id, value) \
+ cfs_fail_check_set(id, value, CFS_FAIL_LOC_RESET)
+
+static inline int cfs_fail_timeout_set(__u32 id, __u32 value, int ms, int set)
+{
+ if (unlikely(CFS_FAIL_PRECHECK(id)))
+ return __cfs_fail_timeout_set(id, value, ms, set);
+ else
+ return 0;
+}
+
+/* If id hit cfs_fail_loc, sleep for seconds or milliseconds */
+#define CFS_FAIL_TIMEOUT(id, secs) \
+ cfs_fail_timeout_set(id, 0, secs * 1000, CFS_FAIL_LOC_NOSET)
+
+#define CFS_FAIL_TIMEOUT_MS(id, ms) \
+ cfs_fail_timeout_set(id, 0, ms, CFS_FAIL_LOC_NOSET)
+
+/* If id hit cfs_fail_loc, cfs_fail_loc |= value and
+ * sleep seconds or milliseconds */
+#define CFS_FAIL_TIMEOUT_ORSET(id, value, secs) \
+ cfs_fail_timeout_set(id, value, secs * 1000, CFS_FAIL_LOC_ORSET)
+
+#define CFS_FAIL_TIMEOUT_MS_ORSET(id, value, ms) \
+ cfs_fail_timeout_set(id, value, ms, CFS_FAIL_LOC_ORSET)
+
+#ifdef __KERNEL__
+/* The idea here is to synchronise two threads to force a race. The
+ * first thread that calls this with a matching fail_loc is put to
+ * sleep. The next thread that calls with the same fail_loc wakes up
+ * the first and continues. */
+static inline void cfs_race(__u32 id)
+{
+ int rc;
+
+ if (CFS_FAIL_PRECHECK(id)) {
+ if (unlikely(__cfs_fail_check_set(id, 0, CFS_FAIL_LOC_NOSET))) {
+ cfs_race_state = 0;
+ CERROR("cfs_race id %x sleeping\n", id);
+ cfs_wait_event_interruptible(cfs_race_waitq, cfs_race_state != 0, rc);
+ CERROR("cfs_fail_race id %x awake\n", id);
+ } else {
+ CERROR("cfs_fail_race id %x waking\n", id);
+ cfs_race_state = 1;
+ cfs_waitq_signal(&cfs_race_waitq);
+ }
+ }
+}
+#define CFS_RACE(id) cfs_race(id)
+#else
+/* sigh. an expedient fix until CFS_RACE is fixed up */
+#define CFS_RACE(foo) do {} while(0)
+#endif
+
+#endif /* _LIBCFS_FAIL_H */
git://git.whamcloud.com / fs / lustre-release.git / commitdiff