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d7e09d03 PT |
1 | /* |
2 | * GPL HEADER START | |
3 | * | |
4 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License version 2 only, | |
8 | * as published by the Free Software Foundation. | |
9 | * | |
10 | * This program is distributed in the hope that it will be useful, but | |
11 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | * General Public License version 2 for more details (a copy is included | |
14 | * in the LICENSE file that accompanied this code). | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * version 2 along with this program; If not, see | |
18 | * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf | |
19 | * | |
20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
21 | * CA 95054 USA or visit www.sun.com if you need additional information or | |
22 | * have any questions. | |
23 | * | |
24 | * GPL HEADER END | |
25 | */ | |
26 | /* | |
27 | * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved. | |
28 | * Use is subject to license terms. | |
29 | * | |
30 | * Copyright (c) 2012, Intel Corporation. | |
31 | */ | |
32 | /* | |
33 | * This file is part of Lustre, http://www.lustre.org/ | |
34 | * Lustre is a trademark of Sun Microsystems, Inc. | |
35 | * | |
36 | * libcfs/libcfs/linux/linux-debug.c | |
37 | * | |
38 | * Author: Phil Schwan <phil@clusterfs.com> | |
39 | */ | |
40 | ||
41 | #include <linux/module.h> | |
42 | #include <linux/kmod.h> | |
43 | #include <linux/notifier.h> | |
44 | #include <linux/kernel.h> | |
45 | #include <linux/mm.h> | |
46 | #include <linux/string.h> | |
47 | #include <linux/stat.h> | |
48 | #include <linux/errno.h> | |
49 | #include <linux/unistd.h> | |
50 | #include <linux/interrupt.h> | |
d7e09d03 | 51 | #include <linux/completion.h> |
d7e09d03 | 52 | #include <linux/fs.h> |
e8fd99fd | 53 | #include <linux/uaccess.h> |
d7e09d03 | 54 | #include <linux/miscdevice.h> |
d7e09d03 PT |
55 | |
56 | # define DEBUG_SUBSYSTEM S_LNET | |
57 | ||
9fdaf8c0 | 58 | #include "../../../include/linux/libcfs/libcfs.h" |
d7e09d03 | 59 | |
da0e6a7a | 60 | #include "../tracefile.h" |
d7e09d03 PT |
61 | |
62 | #include <linux/kallsyms.h> | |
63 | ||
64 | char lnet_upcall[1024] = "/usr/lib/lustre/lnet_upcall"; | |
65 | char lnet_debug_log_upcall[1024] = "/usr/lib/lustre/lnet_debug_log_upcall"; | |
66 | ||
67 | /** | |
68 | * Upcall function once a Lustre log has been dumped. | |
69 | * | |
70 | * \param file path of the dumped log | |
71 | */ | |
72 | void libcfs_run_debug_log_upcall(char *file) | |
73 | { | |
74 | char *argv[3]; | |
75 | int rc; | |
76 | char *envp[] = { | |
77 | "HOME=/", | |
78 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
79 | NULL}; | |
d7e09d03 PT |
80 | |
81 | argv[0] = lnet_debug_log_upcall; | |
82 | ||
83 | LASSERTF(file != NULL, "called on a null filename\n"); | |
995c8b4a | 84 | argv[1] = file; /* only need to pass the path of the file */ |
d7e09d03 PT |
85 | |
86 | argv[2] = NULL; | |
87 | ||
46ffc934 | 88 | rc = call_usermodehelper(argv[0], argv, envp, 1); |
d7e09d03 | 89 | if (rc < 0 && rc != -ENOENT) { |
2d00bd17 | 90 | CERROR("Error %d invoking LNET debug log upcall %s %s; check /proc/sys/lnet/debug_log_upcall\n", |
d7e09d03 PT |
91 | rc, argv[0], argv[1]); |
92 | } else { | |
93 | CDEBUG(D_HA, "Invoked LNET debug log upcall %s %s\n", | |
94 | argv[0], argv[1]); | |
95 | } | |
d7e09d03 PT |
96 | } |
97 | ||
98 | void libcfs_run_upcall(char **argv) | |
99 | { | |
100 | int rc; | |
101 | int argc; | |
102 | char *envp[] = { | |
103 | "HOME=/", | |
104 | "PATH=/sbin:/bin:/usr/sbin:/usr/bin", | |
105 | NULL}; | |
d7e09d03 PT |
106 | |
107 | argv[0] = lnet_upcall; | |
108 | argc = 1; | |
109 | while (argv[argc] != NULL) | |
110 | argc++; | |
111 | ||
112 | LASSERT(argc >= 2); | |
113 | ||
46ffc934 | 114 | rc = call_usermodehelper(argv[0], argv, envp, 1); |
d7e09d03 | 115 | if (rc < 0 && rc != -ENOENT) { |
2d00bd17 | 116 | CERROR("Error %d invoking LNET upcall %s %s%s%s%s%s%s%s%s; check /proc/sys/lnet/upcall\n", |
d7e09d03 PT |
117 | rc, argv[0], argv[1], |
118 | argc < 3 ? "" : ",", argc < 3 ? "" : argv[2], | |
119 | argc < 4 ? "" : ",", argc < 4 ? "" : argv[3], | |
120 | argc < 5 ? "" : ",", argc < 5 ? "" : argv[4], | |
121 | argc < 6 ? "" : ",..."); | |
122 | } else { | |
123 | CDEBUG(D_HA, "Invoked LNET upcall %s %s%s%s%s%s%s%s%s\n", | |
124 | argv[0], argv[1], | |
125 | argc < 3 ? "" : ",", argc < 3 ? "" : argv[2], | |
126 | argc < 4 ? "" : ",", argc < 4 ? "" : argv[3], | |
127 | argc < 5 ? "" : ",", argc < 5 ? "" : argv[4], | |
128 | argc < 6 ? "" : ",..."); | |
129 | } | |
130 | } | |
131 | ||
132 | void libcfs_run_lbug_upcall(struct libcfs_debug_msg_data *msgdata) | |
133 | { | |
134 | char *argv[6]; | |
135 | char buf[32]; | |
136 | ||
ec83e611 | 137 | snprintf(buf, sizeof(buf), "%d", msgdata->msg_line); |
d7e09d03 PT |
138 | |
139 | argv[1] = "LBUG"; | |
140 | argv[2] = (char *)msgdata->msg_file; | |
141 | argv[3] = (char *)msgdata->msg_fn; | |
142 | argv[4] = buf; | |
143 | argv[5] = NULL; | |
144 | ||
145 | libcfs_run_upcall (argv); | |
146 | } | |
147 | ||
148 | /* coverity[+kill] */ | |
2877f245 | 149 | void __noreturn lbug_with_loc(struct libcfs_debug_msg_data *msgdata) |
d7e09d03 PT |
150 | { |
151 | libcfs_catastrophe = 1; | |
152 | libcfs_debug_msg(msgdata, "LBUG\n"); | |
153 | ||
154 | if (in_interrupt()) { | |
155 | panic("LBUG in interrupt.\n"); | |
156 | /* not reached */ | |
157 | } | |
158 | ||
5d4450c4 | 159 | dump_stack(); |
d7e09d03 PT |
160 | if (!libcfs_panic_on_lbug) |
161 | libcfs_debug_dumplog(); | |
162 | libcfs_run_lbug_upcall(msgdata); | |
163 | if (libcfs_panic_on_lbug) | |
164 | panic("LBUG"); | |
165 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
166 | while (1) | |
167 | schedule(); | |
168 | } | |
169 | ||
d7e09d03 PT |
170 | static int panic_notifier(struct notifier_block *self, unsigned long unused1, |
171 | void *unused2) | |
172 | { | |
173 | if (libcfs_panic_in_progress) | |
174 | return 0; | |
175 | ||
176 | libcfs_panic_in_progress = 1; | |
177 | mb(); | |
178 | ||
179 | return 0; | |
180 | } | |
181 | ||
182 | static struct notifier_block libcfs_panic_notifier = { | |
805e517a EG |
183 | .notifier_call = panic_notifier, |
184 | .next = NULL, | |
185 | .priority = 10000, | |
d7e09d03 PT |
186 | }; |
187 | ||
188 | void libcfs_register_panic_notifier(void) | |
189 | { | |
190 | atomic_notifier_chain_register(&panic_notifier_list, &libcfs_panic_notifier); | |
191 | } | |
192 | ||
193 | void libcfs_unregister_panic_notifier(void) | |
194 | { | |
195 | atomic_notifier_chain_unregister(&panic_notifier_list, &libcfs_panic_notifier); | |
196 | } | |
197 | ||
d7e09d03 PT |
198 | EXPORT_SYMBOL(libcfs_run_lbug_upcall); |
199 | EXPORT_SYMBOL(lbug_with_loc); |