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1 | /*****************************************************************************\ | |
2 | * Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC. | |
3 | * Copyright (C) 2007 The Regents of the University of California. | |
4 | * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER). | |
5 | * Written by Brian Behlendorf <behlendorf1@llnl.gov>. | |
6 | * UCRL-CODE-235197 | |
7 | * | |
8 | * This file is part of the SPL, Solaris Porting Layer. | |
9 | * For details, see <http://zfsonlinux.org/>. | |
10 | * | |
11 | * The SPL is free software; you can redistribute it and/or modify it | |
12 | * under the terms of the GNU General Public License as published by the | |
13 | * Free Software Foundation; either version 2 of the License, or (at your | |
14 | * option) any later version. | |
15 | * | |
16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT | |
17 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
18 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
19 | * for more details. | |
20 | * | |
21 | * You should have received a copy of the GNU General Public License along | |
22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. | |
23 | ***************************************************************************** | |
24 | * Solaris Porting Layer (SPL) Error Implementation. | |
25 | \*****************************************************************************/ | |
26 | ||
27 | #include <sys/sysmacros.h> | |
28 | #include <sys/cmn_err.h> | |
29 | #include <linux/ratelimit.h> | |
30 | ||
31 | /* | |
32 | * Limit the number of stack traces dumped to not more than 5 every | |
33 | * 60 seconds to prevent denial-of-service attacks from debug code. | |
34 | */ | |
35 | DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5); | |
36 | ||
37 | void | |
38 | spl_dumpstack(void) | |
39 | { | |
40 | if (__ratelimit(&dumpstack_ratelimit_state)) { | |
41 | printk("Showing stack for process %d\n", current->pid); | |
42 | dump_stack(); | |
43 | } | |
44 | } | |
45 | EXPORT_SYMBOL(spl_dumpstack); | |
46 | ||
47 | int | |
48 | spl_panic(const char *file, const char *func, int line, const char *fmt, ...) { | |
49 | const char *newfile; | |
50 | char msg[MAXMSGLEN]; | |
51 | va_list ap; | |
52 | ||
53 | newfile = strrchr(file, '/'); | |
54 | if (newfile != NULL) | |
55 | newfile = newfile + 1; | |
56 | else | |
57 | newfile = file; | |
58 | ||
59 | va_start(ap, fmt); | |
60 | (void) vsnprintf(msg, sizeof (msg), fmt, ap); | |
61 | va_end(ap); | |
62 | ||
63 | printk(KERN_EMERG "%s", msg); | |
64 | printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func); | |
65 | spl_dumpstack(); | |
66 | ||
67 | /* Halt the thread to facilitate further debugging */ | |
68 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
69 | while (1) | |
70 | schedule(); | |
71 | ||
72 | /* Unreachable */ | |
73 | return (1); | |
74 | } | |
75 | EXPORT_SYMBOL(spl_panic); | |
76 | ||
77 | void | |
78 | vcmn_err(int ce, const char *fmt, va_list ap) | |
79 | { | |
80 | char msg[MAXMSGLEN]; | |
81 | ||
82 | vsnprintf(msg, MAXMSGLEN - 1, fmt, ap); | |
83 | ||
84 | switch (ce) { | |
85 | case CE_IGNORE: | |
86 | break; | |
87 | case CE_CONT: | |
88 | printk("%s", msg); | |
89 | break; | |
90 | case CE_NOTE: | |
91 | printk(KERN_NOTICE "NOTICE: %s\n", msg); | |
92 | break; | |
93 | case CE_WARN: | |
94 | printk(KERN_WARNING "WARNING: %s\n", msg); | |
95 | break; | |
96 | case CE_PANIC: | |
97 | printk(KERN_EMERG "PANIC: %s\n", msg); | |
98 | spl_dumpstack(); | |
99 | ||
100 | /* Halt the thread to facilitate further debugging */ | |
101 | set_task_state(current, TASK_UNINTERRUPTIBLE); | |
102 | while (1) | |
103 | schedule(); | |
104 | } | |
105 | } /* vcmn_err() */ | |
106 | EXPORT_SYMBOL(vcmn_err); | |
107 | ||
108 | void | |
109 | cmn_err(int ce, const char *fmt, ...) | |
110 | { | |
111 | va_list ap; | |
112 | ||
113 | va_start(ap, fmt); | |
114 | vcmn_err(ce, fmt, ap); | |
115 | va_end(ap); | |
116 | } /* cmn_err() */ | |
117 | EXPORT_SYMBOL(cmn_err); |