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3006 VERIFY[S,U,P] and ASSERT[S,U,P] frequently check if first argument is zero
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--- old/usr/src/uts/common/fs/zfs/zfs_debug.c
+++ new/usr/src/uts/common/fs/zfs/zfs_debug.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
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13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
23 + * Copyright (c) 2012 by Delphix. All rights reserved.
23 24 */
24 25
26 +
25 27 #include <sys/zfs_context.h>
26 28
27 29 list_t zfs_dbgmsgs;
28 30 int zfs_dbgmsg_size;
29 31 kmutex_t zfs_dbgmsgs_lock;
30 32 int zfs_dbgmsg_maxsize = 1<<20; /* 1MB */
31 33
32 34 void
33 35 zfs_dbgmsg_init(void)
34 36 {
35 37 list_create(&zfs_dbgmsgs, sizeof (zfs_dbgmsg_t),
36 38 offsetof(zfs_dbgmsg_t, zdm_node));
37 39 mutex_init(&zfs_dbgmsgs_lock, NULL, MUTEX_DEFAULT, NULL);
38 40 }
39 41
40 42 void
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41 43 zfs_dbgmsg_fini(void)
42 44 {
43 45 zfs_dbgmsg_t *zdm;
44 46
45 47 while ((zdm = list_remove_head(&zfs_dbgmsgs)) != NULL) {
46 48 int size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
47 49 kmem_free(zdm, size);
48 50 zfs_dbgmsg_size -= size;
49 51 }
50 52 mutex_destroy(&zfs_dbgmsgs_lock);
51 - ASSERT3U(zfs_dbgmsg_size, ==, 0);
53 + ASSERT0(zfs_dbgmsg_size);
52 54 }
53 55
54 56 /*
55 57 * Print these messages by running:
56 - * echo ::zfs_dbgmsg | mdb -k
58 + * echo ::zfs_dbgmsg | mdb -k
57 59 *
58 60 * Monitor these messages by running:
59 61 * dtrace -q -n 'zfs-dbgmsg{printf("%s\n", stringof(arg0))}'
60 62 */
61 63 void
62 64 zfs_dbgmsg(const char *fmt, ...)
63 65 {
64 66 int size;
65 67 va_list adx;
66 68 zfs_dbgmsg_t *zdm;
67 69
68 70 va_start(adx, fmt);
69 71 size = vsnprintf(NULL, 0, fmt, adx);
70 72 va_end(adx);
71 73
72 74 /*
73 75 * There is one byte of string in sizeof (zfs_dbgmsg_t), used
74 76 * for the terminating null.
75 77 */
76 78 zdm = kmem_alloc(sizeof (zfs_dbgmsg_t) + size, KM_SLEEP);
77 79 zdm->zdm_timestamp = gethrestime_sec();
78 80
79 81 va_start(adx, fmt);
80 82 (void) vsnprintf(zdm->zdm_msg, size + 1, fmt, adx);
81 83 va_end(adx);
82 84
83 85 DTRACE_PROBE1(zfs__dbgmsg, char *, zdm->zdm_msg);
84 86
85 87 mutex_enter(&zfs_dbgmsgs_lock);
86 88 list_insert_tail(&zfs_dbgmsgs, zdm);
87 89 zfs_dbgmsg_size += sizeof (zfs_dbgmsg_t) + size;
88 90 while (zfs_dbgmsg_size > zfs_dbgmsg_maxsize) {
89 91 zdm = list_remove_head(&zfs_dbgmsgs);
90 92 size = sizeof (zfs_dbgmsg_t) + strlen(zdm->zdm_msg);
91 93 kmem_free(zdm, size);
92 94 zfs_dbgmsg_size -= size;
93 95 }
94 96 mutex_exit(&zfs_dbgmsgs_lock);
95 97 }
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