FreeBSD: Fix ZFS so that snapshots under .zfs/snapshot are NFS visible
[zfs.git] / include / sys / spa_checksum.h
blob2202afdeb8da14e9836f611a25f0131287403cdb
1 /*
2 * CDDL HEADER START
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.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or https://opensource.org/licenses/CDDL-1.0.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
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]
19 * CDDL HEADER END
22 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
23 * Use is subject to license terms.
26 #ifndef _SPA_CHECKSUM_H
27 #define _SPA_CHECKSUM_H
29 #include <sys/types.h>
31 #ifdef __cplusplus
32 extern "C" {
33 #endif
36 * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
38 typedef struct zio_cksum {
39 uint64_t zc_word[4];
40 } zio_cksum_t;
42 #define ZIO_SET_CHECKSUM(zcp, w0, w1, w2, w3) \
43 { \
44 (zcp)->zc_word[0] = w0; \
45 (zcp)->zc_word[1] = w1; \
46 (zcp)->zc_word[2] = w2; \
47 (zcp)->zc_word[3] = w3; \
50 #define ZIO_CHECKSUM_EQUAL(zc1, zc2) \
51 (0 == (((zc1).zc_word[0] - (zc2).zc_word[0]) | \
52 ((zc1).zc_word[1] - (zc2).zc_word[1]) | \
53 ((zc1).zc_word[2] - (zc2).zc_word[2]) | \
54 ((zc1).zc_word[3] - (zc2).zc_word[3])))
56 #define ZIO_CHECKSUM_IS_ZERO(zc) \
57 (0 == ((zc)->zc_word[0] | (zc)->zc_word[1] | \
58 (zc)->zc_word[2] | (zc)->zc_word[3]))
60 #define ZIO_CHECKSUM_BSWAP(zcp) \
61 { \
62 (zcp)->zc_word[0] = BSWAP_64((zcp)->zc_word[0]); \
63 (zcp)->zc_word[1] = BSWAP_64((zcp)->zc_word[1]); \
64 (zcp)->zc_word[2] = BSWAP_64((zcp)->zc_word[2]); \
65 (zcp)->zc_word[3] = BSWAP_64((zcp)->zc_word[3]); \
68 #ifdef __cplusplus
70 #endif
72 #endif