362 lines
13 KiB
C
362 lines
13 KiB
C
/*-
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* Copyright (c) 2009 Isilon Inc http://www.isilon.com/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*/
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/**
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* @file
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*
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* Main header for failpoint facility.
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*/
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#ifndef _SYS_FAIL_H_
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#define _SYS_FAIL_H_
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#include <sys/param.h>
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#include <sys/cdefs.h>
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#include <sys/linker_set.h>
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#include <sys/queue.h>
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#include <sys/sysctl.h>
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#include <sys/condvar.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <sys/systm.h>
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/**
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* Failpoint return codes, used internally.
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* @ingroup failpoint_private
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*/
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enum fail_point_return_code {
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FAIL_POINT_RC_CONTINUE = 0, /**< Continue with normal execution */
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FAIL_POINT_RC_RETURN, /**< FP evaluated to 'return' */
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FAIL_POINT_RC_QUEUED, /**< sleep_fn will be called */
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};
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struct fail_point_entry;
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struct fail_point_setting;
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/**
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* Internal failpoint structure, tracking all the current details of the
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* failpoint. This structure is the core component shared between the
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* failure-injection code and the user-interface.
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* @ingroup failpoint_private
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*/
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struct fail_point {
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const char *fp_name; /* name of fail point */
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const char *fp_location; /* file:line of fail point */
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volatile int fp_ref_cnt; /**
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* protects fp_setting: while holding
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* a ref, fp_setting points to an
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* unfreed fail_point_setting
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*/
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struct fail_point_setting * volatile fp_setting;
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int fp_flags;
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/**< Function to call before sleep or pause */
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void (*fp_pre_sleep_fn)(void *);
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/**< Arg for fp_pre_sleep_fn */
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void *fp_pre_sleep_arg;
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/**< Function to call after waking from sleep or pause */
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void (*fp_post_sleep_fn)(void *);
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/**< Arg for fp_post_sleep_fn */
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void *fp_post_sleep_arg;
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};
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#define FAIL_POINT_DYNAMIC_NAME 0x01 /**< Must free name on destroy */
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/**< Use timeout path for sleep instead of msleep */
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#define FAIL_POINT_USE_TIMEOUT_PATH 0x02
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/**< If fail point is set to sleep, replace the sleep call with delay */
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#define FAIL_POINT_NONSLEEPABLE 0x04
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#define FAIL_POINT_CV_DESC "fp cv no iterators"
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#define FAIL_POINT_IS_OFF(fp) (__predict_true((fp)->fp_setting == NULL) || \
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__predict_true(fail_point_is_off(fp)))
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__BEGIN_DECLS
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/* Private failpoint eval function -- use fail_point_eval() instead. */
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enum fail_point_return_code fail_point_eval_nontrivial(struct fail_point *,
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int *ret);
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/**
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* @addtogroup failpoint
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* @{
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*/
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/*
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* Initialize a fail-point. The name is formed in printf-like fashion
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* from "fmt" and the subsequent arguments.
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* Pair with fail_point_destroy().
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*/
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void fail_point_init(struct fail_point *, const char *fmt, ...)
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__printflike(2, 3);
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/* Return true iff this fail point is set to off, false otherwise */
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bool fail_point_is_off(struct fail_point *fp);
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/**
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* Set the pre-sleep function for a fail point
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* If fp_post_sleep_fn is specified, then FAIL_POINT_SLEEP will result in a
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* (*fp->fp_pre_sleep_fn)(fp->fp_pre_sleep_arg) call by the thread.
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*/
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static inline void
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fail_point_sleep_set_pre_func(struct fail_point *fp, void (*sleep_fn)(void *))
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{
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fp->fp_pre_sleep_fn = sleep_fn;
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}
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static inline void
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fail_point_sleep_set_pre_arg(struct fail_point *fp, void *sleep_arg)
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{
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fp->fp_pre_sleep_arg = sleep_arg;
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}
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/**
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* Set the post-sleep function. This will be passed to timeout if we take
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* the timeout path. This must be set if you sleep using the timeout path.
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*/
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static inline void
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fail_point_sleep_set_post_func(struct fail_point *fp, void (*sleep_fn)(void *))
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{
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fp->fp_post_sleep_fn = sleep_fn;
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}
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static inline void
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fail_point_sleep_set_post_arg(struct fail_point *fp, void *sleep_arg)
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{
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fp->fp_post_sleep_arg = sleep_arg;
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}
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/**
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* If the FAIL_POINT_USE_TIMEOUT flag is set on a failpoint, then
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* FAIL_POINT_SLEEP will result in a call to timeout instead of
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* msleep. Note that if you sleep while this flag is set, you must
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* set fp_post_sleep_fn or an error will occur upon waking.
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*/
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static inline void
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fail_point_use_timeout_path(struct fail_point *fp, bool use_timeout,
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void (*post_sleep_fn)(void *))
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{
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KASSERT(!use_timeout || post_sleep_fn != NULL ||
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(post_sleep_fn == NULL && fp->fp_post_sleep_fn != NULL),
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("Setting fp to use timeout, but not setting post_sleep_fn\n"));
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if (use_timeout)
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fp->fp_flags |= FAIL_POINT_USE_TIMEOUT_PATH;
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else
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fp->fp_flags &= ~FAIL_POINT_USE_TIMEOUT_PATH;
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if (post_sleep_fn != NULL)
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fp->fp_post_sleep_fn = post_sleep_fn;
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}
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/**
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* Free the resources used by a fail-point. Pair with fail_point_init().
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*/
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void fail_point_destroy(struct fail_point *);
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/**
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* Evaluate a failpoint.
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*/
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static inline enum fail_point_return_code
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fail_point_eval(struct fail_point *fp, int *ret)
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{
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if (__predict_true(fp->fp_setting == NULL))
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return (FAIL_POINT_RC_CONTINUE);
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return (fail_point_eval_nontrivial(fp, ret));
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}
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__END_DECLS
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/* Declare a fail_point and its sysctl in a function. */
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#define _FAIL_POINT_NAME(name) _fail_point_##name
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#define _FAIL_POINT_LOCATION() "(" __FILE__ ":" __XSTRING(__LINE__) ")"
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#define _FAIL_POINT_INIT(parent, name, flags) \
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static struct fail_point _FAIL_POINT_NAME(name) = { \
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.fp_name = #name, \
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.fp_location = _FAIL_POINT_LOCATION(), \
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.fp_ref_cnt = 0, \
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.fp_setting = NULL, \
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.fp_flags = (flags), \
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.fp_pre_sleep_fn = NULL, \
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.fp_pre_sleep_arg = NULL, \
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.fp_post_sleep_fn = NULL, \
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.fp_post_sleep_arg = NULL, \
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}; \
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SYSCTL_OID(parent, OID_AUTO, name, \
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CTLTYPE_STRING | CTLFLAG_RW | CTLFLAG_MPSAFE, \
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&_FAIL_POINT_NAME(name), 0, fail_point_sysctl, \
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"A", ""); \
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SYSCTL_OID(parent, OID_AUTO, status_##name, \
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CTLTYPE_STRING | CTLFLAG_RD | CTLFLAG_MPSAFE, \
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&_FAIL_POINT_NAME(name), 0, \
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fail_point_sysctl_status, "A", "");
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#define _FAIL_POINT_EVAL(name, cond, code...) \
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int RETURN_VALUE; \
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\
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if (__predict_false(cond && \
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fail_point_eval(&_FAIL_POINT_NAME(name), &RETURN_VALUE))) { \
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\
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code; \
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\
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}
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/**
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* Instantiate a failpoint which returns "RETURN_VALUE" from the function
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* when triggered.
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* @param parent The parent sysctl under which to locate the fp's sysctl
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* @param name The name of the failpoint in the sysctl tree (and printouts)
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* @return Instantly returns the RETURN_VALUE specified in the
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* failpoint, if triggered.
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*/
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#define KFAIL_POINT_RETURN(parent, name) \
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KFAIL_POINT_CODE(parent, name, return RETURN_VALUE)
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/**
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* Instantiate a failpoint which returns (void) from the function when
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* triggered.
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree (and printouts)
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* @return Instantly returns void, if triggered in the failpoint.
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*/
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#define KFAIL_POINT_RETURN_VOID(parent, name) \
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KFAIL_POINT_CODE(parent, name, return)
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/**
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* Instantiate a failpoint which sets an error when triggered.
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree (and
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* printouts)
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* @param error_var A variable to set to the failpoint's specified
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* return-value when triggered
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*/
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#define KFAIL_POINT_ERROR(parent, name, error_var) \
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KFAIL_POINT_CODE(parent, name, (error_var) = RETURN_VALUE)
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/**
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* Instantiate a failpoint which sets an error and then goes to a
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* specified label in the function when triggered.
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree (and
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* printouts)
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* @param error_var A variable to set to the failpoint's specified
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* return-value when triggered
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* @param label The location to goto when triggered.
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*/
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#define KFAIL_POINT_GOTO(parent, name, error_var, label) \
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KFAIL_POINT_CODE(parent, name, (error_var) = RETURN_VALUE; goto label)
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/**
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* Instantiate a failpoint which sets its pre- and post-sleep callback
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* mechanisms.
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree (and
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* printouts)
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* @param pre_func Function pointer to the pre-sleep function, which will be
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* called directly before going to sleep.
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* @param pre_arg Argument to the pre-sleep function
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* @param post_func Function pointer to the pot-sleep function, which will be
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* called directly before going to sleep.
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* @param post_arg Argument to the post-sleep function
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*/
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#define KFAIL_POINT_SLEEP_CALLBACKS(parent, name, pre_func, pre_arg, \
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post_func, post_arg) \
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KFAIL_POINT_CODE_SLEEP_CALLBACKS(parent, name, pre_func, \
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pre_arg, post_func, post_arg, return RETURN_VALUE)
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/**
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* Instantiate a failpoint which runs arbitrary code when triggered, and sets
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* its pre- and post-sleep callback mechanisms
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree (and
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* printouts)
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* @param pre_func Function pointer to the pre-sleep function, which will be
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* called directly before going to sleep.
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* @param pre_arg Argument to the pre-sleep function
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* @param post_func Function pointer to the pot-sleep function, which will be
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* called directly before going to sleep.
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* @param post_arg Argument to the post-sleep function
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* @param code The arbitrary code to run when triggered. Can reference
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* "RETURN_VALUE" if desired to extract the specified
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* user return-value when triggered. Note that this is
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* implemented with a do-while loop so be careful of
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* break and continue statements.
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*/
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#define KFAIL_POINT_CODE_SLEEP_CALLBACKS(parent, name, pre_func, pre_arg, \
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post_func, post_arg, code...) \
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do { \
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_FAIL_POINT_INIT(parent, name) \
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_FAIL_POINT_NAME(name).fp_pre_sleep_fn = pre_func; \
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_FAIL_POINT_NAME(name).fp_pre_sleep_arg = pre_arg; \
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_FAIL_POINT_NAME(name).fp_post_sleep_fn = post_func; \
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_FAIL_POINT_NAME(name).fp_post_sleep_arg = post_arg; \
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_FAIL_POINT_EVAL(name, true, code) \
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} while (0)
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/**
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* Instantiate a failpoint which runs arbitrary code when triggered.
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* @param parent The parent sysctl under which to locate the sysctl
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* @param name The name of the failpoint in the sysctl tree
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* (and printouts)
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* @param code The arbitrary code to run when triggered. Can reference
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* "RETURN_VALUE" if desired to extract the specified
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* user return-value when triggered. Note that this is
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* implemented with a do-while loop so be careful of
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* break and continue statements.
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*/
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#define KFAIL_POINT_CODE(parent, name, code...) \
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do { \
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_FAIL_POINT_INIT(parent, name, 0) \
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_FAIL_POINT_EVAL(name, true, code) \
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} while (0)
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#define KFAIL_POINT_CODE_FLAGS(parent, name, flags, code...) \
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do { \
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_FAIL_POINT_INIT(parent, name, flags) \
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_FAIL_POINT_EVAL(name, true, code) \
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} while (0)
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#define KFAIL_POINT_CODE_COND(parent, name, cond, flags, code...) \
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do { \
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_FAIL_POINT_INIT(parent, name, flags) \
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_FAIL_POINT_EVAL(name, cond, code) \
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} while (0)
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/**
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* @}
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* (end group failpoint)
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*/
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#ifdef _KERNEL
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int fail_point_sysctl(SYSCTL_HANDLER_ARGS);
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int fail_point_sysctl_status(SYSCTL_HANDLER_ARGS);
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/* The fail point sysctl tree. */
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SYSCTL_DECL(_debug_fail_point);
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#define DEBUG_FP _debug_fail_point
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#endif
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#endif /* _SYS_FAIL_H_ */
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