131 lines
3.3 KiB
C
131 lines
3.3 KiB
C
/*
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* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
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* Copyright (C) 2007 The Regents of the University of California.
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* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
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* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
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* UCRL-CODE-235197
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*
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* This file is part of the SPL, Solaris Porting Layer.
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* For details, see <http://zfsonlinux.org/>.
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*
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* The SPL is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* The SPL is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with the SPL. If not, see <http://www.gnu.org/licenses/>.
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*
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* Solaris Porting Layer (SPL) Error Implementation.
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*/
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#include <sys/sysmacros.h>
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#include <sys/cmn_err.h>
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#include <linux/ratelimit.h>
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/*
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* It is often useful to actually have the panic crash the node so you
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* can then get notified of the event, get the crashdump for later
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* analysis and other such goodies.
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* But we would still default to the current default of not to do that.
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*/
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unsigned int spl_panic_halt;
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module_param(spl_panic_halt, uint, 0644);
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MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
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/*
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* Limit the number of stack traces dumped to not more than 5 every
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* 60 seconds to prevent denial-of-service attacks from debug code.
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*/
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DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5);
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void
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spl_dumpstack(void)
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{
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if (__ratelimit(&dumpstack_ratelimit_state)) {
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printk("Showing stack for process %d\n", current->pid);
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dump_stack();
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}
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}
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EXPORT_SYMBOL(spl_dumpstack);
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int
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spl_panic(const char *file, const char *func, int line, const char *fmt, ...) {
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const char *newfile;
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char msg[MAXMSGLEN];
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va_list ap;
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newfile = strrchr(file, '/');
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if (newfile != NULL)
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newfile = newfile + 1;
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else
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newfile = file;
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va_start(ap, fmt);
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(void) vsnprintf(msg, sizeof (msg), fmt, ap);
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va_end(ap);
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printk(KERN_EMERG "%s", msg);
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printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func);
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if (spl_panic_halt)
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panic("%s", msg);
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spl_dumpstack();
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/* Halt the thread to facilitate further debugging */
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set_current_state(TASK_UNINTERRUPTIBLE);
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while (1)
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schedule();
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/* Unreachable */
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return (1);
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}
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EXPORT_SYMBOL(spl_panic);
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void
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vcmn_err(int ce, const char *fmt, va_list ap)
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{
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char msg[MAXMSGLEN];
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vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);
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switch (ce) {
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case CE_IGNORE:
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break;
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case CE_CONT:
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printk("%s", msg);
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break;
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case CE_NOTE:
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printk(KERN_NOTICE "NOTICE: %s\n", msg);
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break;
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case CE_WARN:
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printk(KERN_WARNING "WARNING: %s\n", msg);
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break;
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case CE_PANIC:
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printk(KERN_EMERG "PANIC: %s\n", msg);
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spl_dumpstack();
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/* Halt the thread to facilitate further debugging */
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set_current_state(TASK_UNINTERRUPTIBLE);
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while (1)
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schedule();
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}
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} /* vcmn_err() */
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EXPORT_SYMBOL(vcmn_err);
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void
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cmn_err(int ce, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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vcmn_err(ce, fmt, ap);
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va_end(ap);
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} /* cmn_err() */
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EXPORT_SYMBOL(cmn_err);
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