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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 | * It is often useful to actually have the panic crash the node so you | |
33 | * can then get notified of the event, get the crashdump for later | |
34 | * analysis and other such goodies. | |
35 | * But we would still default to the current default of not to do that. | |
36 | */ | |
37 | unsigned int spl_panic_halt; | |
38 | module_param(spl_panic_halt, uint, 0644); | |
39 | MODULE_PARM_DESC(spl_panic_halt, | |
40 | "Cause kernel panic on assertion failures"); | |
41 | ||
42 | /* | |
43 | * Limit the number of stack traces dumped to not more than 5 every | |
44 | * 60 seconds to prevent denial-of-service attacks from debug code. | |
45 | */ | |
46 | DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5); | |
47 | ||
48 | void | |
49 | spl_dumpstack(void) | |
50 | { | |
51 | if (__ratelimit(&dumpstack_ratelimit_state)) { | |
52 | printk("Showing stack for process %d\n", current->pid); | |
53 | dump_stack(); | |
54 | } | |
55 | } | |
56 | EXPORT_SYMBOL(spl_dumpstack); | |
57 | ||
58 | int | |
59 | spl_panic(const char *file, const char *func, int line, const char *fmt, ...) { | |
60 | const char *newfile; | |
61 | char msg[MAXMSGLEN]; | |
62 | va_list ap; | |
63 | ||
64 | newfile = strrchr(file, '/'); | |
65 | if (newfile != NULL) | |
66 | newfile = newfile + 1; | |
67 | else | |
68 | newfile = file; | |
69 | ||
70 | va_start(ap, fmt); | |
71 | (void) vsnprintf(msg, sizeof (msg), fmt, ap); | |
72 | va_end(ap); | |
73 | ||
74 | printk(KERN_EMERG "%s", msg); | |
75 | printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func); | |
76 | if (spl_panic_halt) | |
77 | panic("%s", msg); | |
78 | ||
79 | spl_dumpstack(); | |
80 | ||
81 | /* Halt the thread to facilitate further debugging */ | |
82 | set_current_state(TASK_UNINTERRUPTIBLE); | |
83 | while (1) | |
84 | schedule(); | |
85 | ||
86 | /* Unreachable */ | |
87 | return (1); | |
88 | } | |
89 | EXPORT_SYMBOL(spl_panic); | |
90 | ||
91 | void | |
92 | vcmn_err(int ce, const char *fmt, va_list ap) | |
93 | { | |
94 | char msg[MAXMSGLEN]; | |
95 | ||
96 | vsnprintf(msg, MAXMSGLEN - 1, fmt, ap); | |
97 | ||
98 | switch (ce) { | |
99 | case CE_IGNORE: | |
100 | break; | |
101 | case CE_CONT: | |
102 | printk("%s", msg); | |
103 | break; | |
104 | case CE_NOTE: | |
105 | printk(KERN_NOTICE "NOTICE: %s\n", msg); | |
106 | break; | |
107 | case CE_WARN: | |
108 | printk(KERN_WARNING "WARNING: %s\n", msg); | |
109 | break; | |
110 | case CE_PANIC: | |
111 | printk(KERN_EMERG "PANIC: %s\n", msg); | |
112 | spl_dumpstack(); | |
113 | ||
114 | /* Halt the thread to facilitate further debugging */ | |
115 | set_current_state(TASK_UNINTERRUPTIBLE); | |
116 | while (1) | |
117 | schedule(); | |
118 | } | |
119 | } /* vcmn_err() */ | |
120 | EXPORT_SYMBOL(vcmn_err); | |
121 | ||
122 | void | |
123 | cmn_err(int ce, const char *fmt, ...) | |
124 | { | |
125 | va_list ap; | |
126 | ||
127 | va_start(ap, fmt); | |
128 | vcmn_err(ce, fmt, ap); | |
129 | va_end(ap); | |
130 | } /* cmn_err() */ | |
131 | EXPORT_SYMBOL(cmn_err); |