/*
- * This file is part of the SPL: Solaris Porting Layer.
- *
- * Copyright (c) 2008 Lawrence Livermore National Security, LLC.
- * Produced at Lawrence Livermore National Laboratory
- * Written by:
- * Brian Behlendorf <behlendorf1@llnl.gov>,
- * Herb Wartens <wartens2@llnl.gov>,
- * Jim Garlick <garlick@llnl.gov>
+ * 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 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.
+ * 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.
*
- * This is distributed in the hope that it will be useful, but WITHOUT
+ * 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 this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * 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>
-#ifdef DEBUG_SUBSYSTEM
-#undef DEBUG_SUBSYSTEM
-#endif
-
-#define DEBUG_SUBSYSTEM S_GENERIC
+/*
+ * 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.
+ */
+/* BEGIN CSTYLED */
+unsigned int spl_panic_halt;
+module_param(spl_panic_halt, uint, 0644);
+MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures");
+/* END CSTYLED */
-#ifndef NDEBUG
-static char ce_prefix[CE_IGNORE][10] = { "", "NOTICE: ", "WARNING: ", "" };
-static char ce_suffix[CE_IGNORE][2] = { "", "\n", "\n", "" };
-#endif
+/*
+ * 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
-vpanic(const char *fmt, va_list ap)
+spl_dumpstack(void)
{
- char msg[MAXMSGLEN];
-
- vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);
- panic(msg);
-} /* vpanic() */
-EXPORT_SYMBOL(vpanic);
+ if (__ratelimit(&dumpstack_ratelimit_state)) {
+ printk("Showing stack for process %d\n", current->pid);
+ dump_stack();
+ }
+}
+EXPORT_SYMBOL(spl_dumpstack);
-void
-cmn_err(int ce, const char *fmt, ...)
+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);
- vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);
+ (void) vsnprintf(msg, sizeof (msg), fmt, ap);
va_end(ap);
- CERROR("%s", msg);
-} /* cmn_err() */
-EXPORT_SYMBOL(cmn_err);
+ 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];
- if (ce == CE_PANIC)
- vpanic(fmt, ap);
+ 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();
- if (ce != CE_NOTE) { /* suppress noise in stress testing */
- vsnprintf(msg, MAXMSGLEN - 1, fmt, ap);
- CERROR("%s%s%s", ce_prefix[ce], msg, ce_suffix[ce]);
- }
+ /* 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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