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/*
* 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>
/*
* It is often useful to actually have the panic crash the node so you
* can then get notified of the event, get the crashdump for later
* analysis and other such goodies.
* But we would still default to the current default of not to do that.
*/
unsigned int spl_panic_halt;
module_param(spl_panic_halt, uint, 0644);
MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
/*
* 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);
if (spl_panic_halt)
panic("%s", msg);
spl_dumpstack();
/* Halt the thread to facilitate further debugging */
set_current_state(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_current_state(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);
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