[mirror_spl-debian.git] / module / spl / spl-err.c

/*****************************************************************************\
 *  Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
 *  Copyright (C) 2007 The Regents of the University of California.
 *  Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
 *  Written by Brian Behlendorf <behlendorf1@llnl.gov>.
 *  UCRL-CODE-235197
 *
 *  This file is part of the SPL, Solaris Porting Layer.
 *  For details, see <http://zfsonlinux.org/>.
 *
 *  The SPL is free software; you can redistribute it and/or modify it
 *  under the terms of the GNU General Public License as published by the
 *  Free Software Foundation; either version 2 of the License, or (at your
 *  option) any later version.
 *
 *  The SPL 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
 *  for more details.
 *
 *  You should have received a copy of the GNU General Public License along
 *  with the SPL.  If not, see <http://www.gnu.org/licenses/>.
 *****************************************************************************
 *  Solaris Porting Layer (SPL) Error Implementation.
\*****************************************************************************/

#include <sys/sysmacros.h>
#include <sys/cmn_err.h>
#include <linux/ratelimit.h>

/*
 * Limit the number of stack traces dumped to not more than 5 every
 * 60 seconds to prevent denial-of-service attacks from debug code.
 */
DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5);

void
spl_dumpstack(void)
{
	if (__ratelimit(&dumpstack_ratelimit_state)) {
		printk("Showing stack for process %d\n", current->pid);
		dump_stack();
	}
}
EXPORT_SYMBOL(spl_dumpstack);

int
spl_panic(const char *file, const char *func, int line, const char *fmt, ...) {
	const char *newfile;
	char msg[MAXMSGLEN];
	va_list ap;

	newfile = strrchr(file, '/');
	if (newfile != NULL)
		newfile = newfile + 1;
	else
		newfile = file;

	va_start(ap, fmt);
	(void) vsnprintf(msg, sizeof (msg), fmt, ap);
	va_end(ap);

	printk(KERN_EMERG "%s", msg);
	printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
	spl_dumpstack();

	/* Halt the thread to facilitate further debugging */
	set_task_state(current, TASK_UNINTERRUPTIBLE);
	while (1)
		schedule();

	/* Unreachable */
	return (1);
}
EXPORT_SYMBOL(spl_panic);

void
vcmn_err(int ce, const char *fmt, va_list ap)
{
	char msg[MAXMSGLEN];

	vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);

	switch (ce) {
	case CE_IGNORE:
		break;
	case CE_CONT:
		printk("%s", msg);
		break;
	case CE_NOTE:
		printk(KERN_NOTICE "NOTICE: %s\n", msg);
		break;
	case CE_WARN:
		printk(KERN_WARNING "WARNING: %s\n", msg);
		break;
	case CE_PANIC:
		printk(KERN_EMERG "PANIC: %s\n", msg);
		spl_dumpstack();

		/* Halt the thread to facilitate further debugging */
		set_task_state(current, TASK_UNINTERRUPTIBLE);
		while (1)
			schedule();
	}
} /* vcmn_err() */
EXPORT_SYMBOL(vcmn_err);

void
cmn_err(int ce, const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	vcmn_err(ce, fmt, ap);
	va_end(ap);
} /* cmn_err() */
EXPORT_SYMBOL(cmn_err);
Commit	Line	Data
716154c5 BB	1	/*****************************************************************************\
	2	* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
	3	* Copyright (C) 2007 The Regents of the University of California.
	4	* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
	5	* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
715f6251	6	* UCRL-CODE-235197
715f6251	7	*
716154c5	8	* This file is part of the SPL, Solaris Porting Layer.
3d6af2dd	9	* For details, see <http://zfsonlinux.org/>.
716154c5 BB	10	*
	11	* The SPL is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation; either version 2 of the License, or (at your
	14	* option) any later version.
715f6251	15	*
716154c5	16	* The SPL is distributed in the hope that it will be useful, but WITHOUT
715f6251	17	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	18	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	19	* for more details.
	20	*
	21	* You should have received a copy of the GNU General Public License along
716154c5 BB	22	* with the SPL. If not, see <http://www.gnu.org/licenses/>.
	23	*****************************************************************************
	24	* Solaris Porting Layer (SPL) Error Implementation.
	25	\*****************************************************************************/
715f6251	26
05ae387b	27	#include <sys/sysmacros.h>
05ae387b	28	#include <sys/cmn_err.h>
10946b02	29	#include <linux/ratelimit.h>
05ae387b	30
10946b02 AX	31	/*
	32	* Limit the number of stack traces dumped to not more than 5 every
	33	* 60 seconds to prevent denial-of-service attacks from debug code.
	34	*/
	35	DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5);
937879f1	36
10946b02 AX	37	void
	38	spl_dumpstack(void)
	39	{
	40	if (__ratelimit(&dumpstack_ratelimit_state)) {
	41	printk("Showing stack for process %d\n", current->pid);
	42	dump_stack();
	43	}
	44	}
	45	EXPORT_SYMBOL(spl_dumpstack);
05ae387b	46
9e4fb5c2	47	int
10946b02 AX	48	spl_panic(const char file, const char func, int line, const char *fmt, ...) {
10946b02 AX	49	const char *newfile;
9e4fb5c2 LG	50	char msg[MAXMSGLEN];
	51	va_list ap;
	52
10946b02 AX	53	newfile = strrchr(file, '/');
	54	if (newfile != NULL)
	55	newfile = newfile + 1;
	56	else
	57	newfile = file;
	58
9e4fb5c2	59	va_start(ap, fmt);
10946b02	60	(void) vsnprintf(msg, sizeof (msg), fmt, ap);
9e4fb5c2	61	va_end(ap);
10946b02	62
9e4fb5c2	63	printk(KERN_EMERG "%s", msg);
10946b02 AX	64	printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
10946b02 AX	65	spl_dumpstack();
9e4fb5c2	66
10946b02 AX	67	/* Halt the thread to facilitate further debugging */
	68	set_task_state(current, TASK_UNINTERRUPTIBLE);
	69	while (1)
	70	schedule();
05ae387b	71
10946b02 AX	72	/* Unreachable */
	73	return (1);
	74	}
	75	EXPORT_SYMBOL(spl_panic);
05ae387b	76
05ae387b	77	void
	78	vcmn_err(int ce, const char *fmt, va_list ap)
	79	{
	80	char msg[MAXMSGLEN];
	81
10946b02	82	vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);
05ae387b	83
10946b02 AX	84	switch (ce) {
	85	case CE_IGNORE:
	86	break;
	87	case CE_CONT:
	88	printk("%s", msg);
	89	break;
	90	case CE_NOTE:
	91	printk(KERN_NOTICE "NOTICE: %s\n", msg);
	92	break;
	93	case CE_WARN:
	94	printk(KERN_WARNING "WARNING: %s\n", msg);
	95	break;
	96	case CE_PANIC:
	97	printk(KERN_EMERG "PANIC: %s\n", msg);
	98	spl_dumpstack();
4bd577d0	99
10946b02 AX	100	/* Halt the thread to facilitate further debugging */
	101	set_task_state(current, TASK_UNINTERRUPTIBLE);
	102	while (1)
	103	schedule();
f7e8739c	104	}
05ae387b	105	} /* vcmn_err() */
05ae387b	106	EXPORT_SYMBOL(vcmn_err);
4bd577d0 BB	107
	108	void
	109	cmn_err(int ce, const char *fmt, ...)
	110	{
	111	va_list ap;
	112
	113	va_start(ap, fmt);
	114	vcmn_err(ce, fmt, ap);
	115	va_end(ap);
	116	} /* cmn_err() */
	117	EXPORT_SYMBOL(cmn_err);