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4b393c50 | 1 | /* |
716154c5 BB |
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>. | |
715f6251 | 6 | * UCRL-CODE-235197 |
7 | * | |
716154c5 | 8 | * This file is part of the SPL, Solaris Porting Layer. |
3d6af2dd | 9 | * For details, see <http://zfsonlinux.org/>. |
716154c5 BB |
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. | |
715f6251 | 15 | * |
716154c5 | 16 | * The SPL is distributed in the hope that it will be useful, but WITHOUT |
715f6251 | 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 | |
716154c5 | 22 | * with the SPL. If not, see <http://www.gnu.org/licenses/>. |
5461eefe | 23 | * |
716154c5 | 24 | * Solaris Porting Layer (SPL) Error Implementation. |
4b393c50 | 25 | */ |
715f6251 | 26 | |
05ae387b | 27 | #include <sys/sysmacros.h> |
28 | #include <sys/cmn_err.h> | |
8d9a23e8 | 29 | #include <linux/ratelimit.h> |
05ae387b | 30 | |
410f7ab5 OD |
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 | */ | |
3673d032 | 37 | /* BEGIN CSTYLED */ |
410f7ab5 OD |
38 | unsigned int spl_panic_halt; |
39 | module_param(spl_panic_halt, uint, 0644); | |
5461eefe | 40 | MODULE_PARM_DESC(spl_panic_halt, "Cause kernel panic on assertion failures"); |
3673d032 | 41 | /* END CSTYLED */ |
410f7ab5 | 42 | |
8d9a23e8 BB |
43 | /* |
44 | * Limit the number of stack traces dumped to not more than 5 every | |
45 | * 60 seconds to prevent denial-of-service attacks from debug code. | |
46 | */ | |
47 | DEFINE_RATELIMIT_STATE(dumpstack_ratelimit_state, 60 * HZ, 5); | |
937879f1 | 48 | |
8d9a23e8 BB |
49 | void |
50 | spl_dumpstack(void) | |
51 | { | |
52 | if (__ratelimit(&dumpstack_ratelimit_state)) { | |
53 | printk("Showing stack for process %d\n", current->pid); | |
54 | dump_stack(); | |
55 | } | |
56 | } | |
57 | EXPORT_SYMBOL(spl_dumpstack); | |
05ae387b | 58 | |
f6a86961 | 59 | int |
3673d032 BB |
60 | spl_panic(const char *file, const char *func, int line, const char *fmt, ...) |
61 | { | |
8d9a23e8 | 62 | const char *newfile; |
f6a86961 TC |
63 | char msg[MAXMSGLEN]; |
64 | va_list ap; | |
65 | ||
8d9a23e8 BB |
66 | newfile = strrchr(file, '/'); |
67 | if (newfile != NULL) | |
68 | newfile = newfile + 1; | |
69 | else | |
70 | newfile = file; | |
71 | ||
f6a86961 | 72 | va_start(ap, fmt); |
8d9a23e8 | 73 | (void) vsnprintf(msg, sizeof (msg), fmt, ap); |
f6a86961 | 74 | va_end(ap); |
8d9a23e8 | 75 | |
f6a86961 | 76 | printk(KERN_EMERG "%s", msg); |
8d9a23e8 | 77 | printk(KERN_EMERG "PANIC at %s:%d:%s()\n", newfile, line, func); |
410f7ab5 OD |
78 | if (spl_panic_halt) |
79 | panic("%s", msg); | |
80 | ||
8d9a23e8 | 81 | spl_dumpstack(); |
f6a86961 | 82 | |
8d9a23e8 | 83 | /* Halt the thread to facilitate further debugging */ |
8d5feeca | 84 | set_current_state(TASK_UNINTERRUPTIBLE); |
8d9a23e8 BB |
85 | while (1) |
86 | schedule(); | |
05ae387b | 87 | |
8d9a23e8 BB |
88 | /* Unreachable */ |
89 | return (1); | |
90 | } | |
91 | EXPORT_SYMBOL(spl_panic); | |
05ae387b | 92 | |
05ae387b | 93 | void |
94 | vcmn_err(int ce, const char *fmt, va_list ap) | |
95 | { | |
96 | char msg[MAXMSGLEN]; | |
97 | ||
8d9a23e8 | 98 | vsnprintf(msg, MAXMSGLEN - 1, fmt, ap); |
05ae387b | 99 | |
8d9a23e8 BB |
100 | switch (ce) { |
101 | case CE_IGNORE: | |
102 | break; | |
103 | case CE_CONT: | |
104 | printk("%s", msg); | |
105 | break; | |
106 | case CE_NOTE: | |
107 | printk(KERN_NOTICE "NOTICE: %s\n", msg); | |
108 | break; | |
109 | case CE_WARN: | |
110 | printk(KERN_WARNING "WARNING: %s\n", msg); | |
111 | break; | |
112 | case CE_PANIC: | |
113 | printk(KERN_EMERG "PANIC: %s\n", msg); | |
114 | spl_dumpstack(); | |
4bd577d0 | 115 | |
8d9a23e8 | 116 | /* Halt the thread to facilitate further debugging */ |
8d5feeca | 117 | set_current_state(TASK_UNINTERRUPTIBLE); |
8d9a23e8 BB |
118 | while (1) |
119 | schedule(); | |
f7e8739c | 120 | } |
05ae387b | 121 | } /* vcmn_err() */ |
122 | EXPORT_SYMBOL(vcmn_err); | |
4bd577d0 BB |
123 | |
124 | void | |
125 | cmn_err(int ce, const char *fmt, ...) | |
126 | { | |
127 | va_list ap; | |
128 | ||
129 | va_start(ap, fmt); | |
130 | vcmn_err(ce, fmt, ap); | |
131 | va_end(ap); | |
132 | } /* cmn_err() */ | |
133 | EXPORT_SYMBOL(cmn_err); |