xref: /illumos-gate/usr/src/uts/common/fs/zfs/sys/spa_checksum.h (revision 0886dcadf4b2cd677c3b944167f0d16ccb243616)
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 2009 Sun Microsystems, Inc.  All rights reserved.
23  * Use is subject to license terms.
24  */
25 
26 #ifndef	_SPA_CHECKSUM_H
27 #define	_SPA_CHECKSUM_H
28 
29 #include <sys/types.h>
30 
31 #ifdef	__cplusplus
32 extern "C" {
33 #endif
34 
35 /*
36  * Each block has a 256-bit checksum -- strong enough for cryptographic hashes.
37  */
38 typedef struct zio_cksum {
39 	uint64_t	zc_word[4];
40 } zio_cksum_t;
41 
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;			\
48 }
49 
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])))
55 
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]))
59 
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]);	\
66 }
67 
68 #ifdef	__cplusplus
69 }
70 #endif
71 
72 #endif /* _SPA_CHECKSUM_H */
73