| /* |
| * 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_upcall[1024] = "/usr/lib/lustre/lnet_upcall"; |
| 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; |
| char *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, 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]); |
| } |
| } |
| |
| void libcfs_run_upcall(char **argv) |
| { |
| int rc; |
| int argc; |
| char *envp[] = { |
| "HOME=/", |
| "PATH=/sbin:/bin:/usr/sbin:/usr/bin", |
| NULL}; |
| |
| argv[0] = lnet_upcall; |
| argc = 1; |
| while (argv[argc]) |
| argc++; |
| |
| LASSERT(argc >= 2); |
| |
| rc = call_usermodehelper(argv[0], argv, envp, 1); |
| if (rc < 0 && rc != -ENOENT) { |
| CERROR("Error %d invoking LNET upcall %s %s%s%s%s%s%s%s%s; check /sys/kernel/debug/lnet/upcall\n", |
| rc, argv[0], argv[1], |
| argc < 3 ? "" : ",", argc < 3 ? "" : argv[2], |
| argc < 4 ? "" : ",", argc < 4 ? "" : argv[3], |
| argc < 5 ? "" : ",", argc < 5 ? "" : argv[4], |
| argc < 6 ? "" : ",..."); |
| } else { |
| CDEBUG(D_HA, "Invoked LNET upcall %s %s%s%s%s%s%s%s%s\n", |
| argv[0], argv[1], |
| argc < 3 ? "" : ",", argc < 3 ? "" : argv[2], |
| argc < 4 ? "" : ",", argc < 4 ? "" : argv[3], |
| argc < 5 ? "" : ",", argc < 5 ? "" : argv[4], |
| argc < 6 ? "" : ",..."); |
| } |
| } |
| |
| void libcfs_run_lbug_upcall(struct libcfs_debug_msg_data *msgdata) |
| { |
| char *argv[6]; |
| char buf[32]; |
| |
| snprintf(buf, sizeof(buf), "%d", msgdata->msg_line); |
| |
| argv[1] = "LBUG"; |
| argv[2] = (char *)msgdata->msg_file; |
| argv[3] = (char *)msgdata->msg_fn; |
| argv[4] = buf; |
| argv[5] = NULL; |
| |
| libcfs_run_upcall(argv); |
| } |
| EXPORT_SYMBOL(libcfs_run_lbug_upcall); |
| |
| /* 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(); |
| libcfs_run_lbug_upcall(msgdata); |
| 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); |
| } |