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428870ff BB |
1 | /* |
2 | * CDDL HEADER START | |
3 | * | |
4 | * The contents of this file are subject to the terms of the | |
5 | * Common Development and Distribution License (the "License"). | |
6 | * You may not use this file except in compliance with the License. | |
7 | * | |
8 | * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE | |
9 | * or http://www.opensolaris.org/os/licensing. | |
10 | * See the License for the specific language governing permissions | |
11 | * and limitations under the License. | |
12 | * | |
13 | * When distributing Covered Code, include this CDDL HEADER in each | |
14 | * file and include the License file at usr/src/OPENSOLARIS.LICENSE. | |
15 | * If applicable, add the following below this CDDL HEADER, with the | |
16 | * fields enclosed by brackets "[]" replaced with your own identifying | |
17 | * information: Portions Copyright [yyyy] [name of copyright owner] | |
18 | * | |
19 | * CDDL HEADER END | |
20 | */ | |
21 | /* | |
22 | * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. | |
5d1f7fb6 | 23 | * Copyright (c) 2013 by Delphix. All rights reserved. |
428870ff BB |
24 | */ |
25 | ||
26 | #include <sys/zfs_context.h> | |
27 | ||
495b25a9 RY |
28 | #if !defined(_KERNEL) || !defined(__linux__) |
29 | list_t zfs_dbgmsgs; | |
30 | int zfs_dbgmsg_size; | |
31 | kmutex_t zfs_dbgmsgs_lock; | |
32 | int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */ | |
33 | #endif | |
34 | ||
d7e398ce BB |
35 | /* |
36 | * Enable various debugging features. | |
37 | */ | |
38 | int zfs_flags = 0; | |
39 | ||
40 | /* | |
41 | * zfs_recover can be set to nonzero to attempt to recover from | |
42 | * otherwise-fatal errors, typically caused by on-disk corruption. When | |
43 | * set, calls to zfs_panic_recover() will turn into warning messages. | |
44 | */ | |
45 | int zfs_recover = 0; | |
428870ff | 46 | |
428870ff BB |
47 | |
48 | void | |
d7e398ce | 49 | zfs_panic_recover(const char *fmt, ...) |
428870ff | 50 | { |
d7e398ce | 51 | va_list adx; |
428870ff | 52 | |
d7e398ce BB |
53 | va_start(adx, fmt); |
54 | vcmn_err(zfs_recover ? CE_WARN : CE_PANIC, fmt, adx); | |
55 | va_end(adx); | |
428870ff BB |
56 | } |
57 | ||
58 | /* | |
d7e398ce BB |
59 | * Debug logging is enabled by default for production kernel builds. |
60 | * The overhead for this is negligible and the logs can be valuable when | |
61 | * debugging. For non-production user space builds all debugging except | |
62 | * logging is enabled since performance is no longer a concern. | |
428870ff BB |
63 | */ |
64 | void | |
d7e398ce | 65 | zfs_dbgmsg_init(void) |
428870ff | 66 | { |
495b25a9 RY |
67 | #if !defined(_KERNEL) || !defined(__linux__) |
68 | list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t), | |
69 | offsetof(zfs_dbgmsg_t, zdm_node)); | |
70 | mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL); | |
71 | #endif | |
72 | ||
d7e398ce BB |
73 | if (zfs_flags == 0) { |
74 | #if defined(_KERNEL) | |
75 | zfs_flags = ZFS_DEBUG_DPRINTF; | |
a31acb46 BB |
76 | spl_debug_set_mask(spl_debug_get_mask() | SD_DPRINTF); |
77 | spl_debug_set_subsys(spl_debug_get_subsys() | SS_USER1); | |
d7e398ce BB |
78 | #else |
79 | zfs_flags = ~ZFS_DEBUG_DPRINTF; | |
80 | #endif /* _KERNEL */ | |
81 | } | |
82 | } | |
428870ff | 83 | |
d7e398ce BB |
84 | void |
85 | zfs_dbgmsg_fini(void) | |
86 | { | |
495b25a9 RY |
87 | #if !defined(_KERNEL) || !defined(__linux__) |
88 | zfs_dbgmsg_t *zdm; | |
89 | ||
90 | while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) { | |
91 | int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg); | |
92 | kmem_free(zdm, size); | |
93 | zfs_dbgmsg_size -= size; | |
94 | } | |
95 | mutex_destroy(&zfs_dbgmsgs_lock); | |
96 | ASSERT0(zfs_dbgmsg_size); | |
97 | #endif | |
d7e398ce BB |
98 | return; |
99 | } | |
428870ff | 100 | |
495b25a9 RY |
101 | #if !defined(_KERNEL) || !defined(__linux__) |
102 | /* | |
103 | * Print these messages by running: | |
104 | * echo ::zfs_dbgmsg | mdb -k | |
105 | * | |
106 | * Monitor these messages by running: | |
107 | * dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}' | |
108 | */ | |
109 | void | |
110 | zfs_dbgmsg(const char *fmt, ...) | |
111 | { | |
112 | int size; | |
113 | va_list adx; | |
114 | zfs_dbgmsg_t *zdm; | |
115 | ||
116 | va_start(adx, fmt); | |
117 | size = vsnprintf(NULL, 0, fmt, adx); | |
118 | va_end(adx); | |
119 | ||
120 | /* | |
121 | * There is one byte of string in sizeof (zfs_dbgmsg_t), used | |
122 | * for the terminating null. | |
123 | */ | |
124 | zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP); | |
125 | zdm->zdm_timestamp = gethrestime_sec(); | |
126 | ||
127 | va_start(adx, fmt); | |
128 | (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx); | |
129 | va_end(adx); | |
130 | ||
131 | DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg); | |
132 | ||
133 | mutex_enter(&zfs_dbgmsgs_lock); | |
134 | list_insert_tail(&zfs_dbgmsgs, zdm); | |
135 | zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size; | |
136 | while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) { | |
137 | zdm = list_remove_head(&zfs_dbgmsgs); | |
138 | size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg); | |
139 | kmem_free(zdm, size); | |
140 | zfs_dbgmsg_size -= size; | |
141 | } | |
142 | mutex_exit(&zfs_dbgmsgs_lock); | |
143 | } | |
5d1f7fb6 GW |
144 | |
145 | void | |
146 | zfs_dbgmsg_print(const char *tag) | |
147 | { | |
148 | zfs_dbgmsg_t *zdm; | |
149 | ||
150 | (void) printf("ZFS_DBGMSG(%s):\n", tag); | |
151 | mutex_enter(&zfs_dbgmsgs_lock); | |
152 | for (zdm = list_head(&zfs_dbgmsgs); zdm; | |
153 | zdm = list_next(&zfs_dbgmsgs, zdm)) | |
154 | (void) printf("%s\n", zdm->zdm_msg); | |
155 | mutex_exit(&zfs_dbgmsgs_lock); | |
156 | } | |
495b25a9 | 157 | #endif |
428870ff | 158 | |
d7e398ce BB |
159 | #if defined(_KERNEL) |
160 | module_param(zfs_flags, int, 0644); | |
161 | MODULE_PARM_DESC(zfs_flags, "Set additional debugging flags"); | |
428870ff | 162 | |
d7e398ce BB |
163 | module_param(zfs_recover, int, 0644); |
164 | MODULE_PARM_DESC(zfs_recover, "Set to attempt to recover from fatal errors"); | |
165 | #endif /* _KERNEL */ |