include/sys/spa_checksum.h

   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