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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* This program 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
* http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
/*
* Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
* Copyright (c) 2012, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
* Lustre is a trademark of Sun Microsystems, Inc.
*
* libcfs/libcfs/linux/linux-debug.c
*
* Author: Phil Schwan <phil@clusterfs.com>
*/
#include <linux/module.h>
#include <linux/kmod.h>
#include <linux/notifier.h>
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/string.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/interrupt.h>
#include <linux/completion.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
# define DEBUG_SUBSYSTEM S_LNET
#include "../../../include/linux/libcfs/libcfs.h"
#include "../tracefile.h"
#include <linux/kallsyms.h>
char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall";
/**
* Upcall function once a Lustre log has been dumped.
*
* \param file path of the dumped log
*/
void libcfs_run_debug_log_upcall(char *file)
{
char *argv[3];
int rc;
static const char * const envp[] = {
"HOME=/",
"PATH=/sbin:/bin:/usr/sbin:/usr/bin",
NULL
};
argv[0] = lnet_debug_log_upcall;
LASSERTF(file, "called on a null filename\n");
argv[1] = file; /* only need to pass the path of the file */
argv[2] = NULL;
rc = call_usermodehelper(argv[0], argv, (char **)envp, 1);
if (rc < 0 && rc != -ENOENT) {
CERROR("Error %d invoking LNET debug log upcall %s %s; check /sys/kernel/debug/lnet/debug_log_upcall\n",
rc, argv[0], argv[1]);
} else {
CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n",
argv[0], argv[1]);
}
}
/* coverity[+kill] */
void __noreturn lbug_with_loc(struct libcfs_debug_msg_data *msgdata)
{
libcfs_catastrophe = 1;
libcfs_debug_msg(msgdata, "LBUG\n");
if (in_interrupt()) {
panic("LBUG in interrupt.\n");
/* not reached */
}
dump_stack();
if (!libcfs_panic_on_lbug)
libcfs_debug_dumplog();
if (libcfs_panic_on_lbug)
panic("LBUG");
set_task_state(current, TASK_UNINTERRUPTIBLE);
while (1)
schedule();
}
EXPORT_SYMBOL(lbug_with_loc);
static int panic_notifier(struct notifier_block *self, unsigned long unused1,
void *unused2)
{
if (libcfs_panic_in_progress)
return 0;
libcfs_panic_in_progress = 1;
mb();
return 0;
}
static struct notifier_block libcfs_panic_notifier = {
.notifier_call = panic_notifier,
.next = NULL,
.priority = 10000,
};
void libcfs_register_panic_notifier(void)
{
atomic_notifier_chain_register(&panic_notifier_list,
&libcfs_panic_notifier);
}
void libcfs_unregister_panic_notifier(void)
{
atomic_notifier_chain_unregister(&panic_notifier_list,
&libcfs_panic_notifier);
}
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