1 files changed, 133 insertions, 0 deletions
diff --git a/module/spl/spl-err.c b/module/spl/spl-err.c
new file mode 100644
index 000000000..6b71296e8
--- /dev/null
+++ b/module/spl/spl-err.c
@@ -0,0 +1,133 @@
+/*
+ *  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 <[email protected]>.
+ *  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.
+ */
+/* 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 */
+
+/*
+ * 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);