usr/src/uts/common/fs/zfs/sys/zio_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 (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  23  * Copyright (c) 2014 by Delphix. All rights reserved.
  24  */
  25
  26 #ifndef _SYS_ZIO_CHECKSUM_H
  27 #define _SYS_ZIO_CHECKSUM_H
  28
  29 #include <sys/zio.h>
  30
  31 #ifdef  __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /*
  36  * Signature for checksum functions.
  37  */
  38 typedef void zio_checksum_func_t(const void *, uint64_t, zio_cksum_t *);
  39
  40 /*
  41  * Information about each checksum function.
  42  */
  43 typedef struct zio_checksum_info {
  44         zio_checksum_func_t *ci_func[2]; /* checksum function per byteorder */
  45         int             ci_correctable; /* number of correctable bits   */
  46         int             ci_eck;         /* uses zio embedded checksum? */
  47         boolean_t       ci_dedup;       /* strong enough for dedup? */
  48         char            *ci_name;       /* descriptive name */
  49 } zio_checksum_info_t;
  50
  51 typedef struct zio_bad_cksum {
  52         zio_cksum_t             zbc_expected;
  53         zio_cksum_t             zbc_actual;
  54         const char              *zbc_checksum_name;
  55         uint8_t                 zbc_byteswapped;
  56         uint8_t                 zbc_injected;
  57         uint8_t                 zbc_has_cksum;  /* expected/actual valid */
  58 } zio_bad_cksum_t;
  59
  60 extern zio_checksum_info_t zio_checksum_table[ZIO_CHECKSUM_FUNCTIONS];
  61
  62 /*
  63  * Checksum routines.
  64  */
  65 extern zio_checksum_func_t zio_checksum_SHA256;
  66
  67 extern void zio_checksum_compute(zio_t *zio, enum zio_checksum checksum,
  68     void *data, uint64_t size);
  69 extern int zio_checksum_error(zio_t *zio, zio_bad_cksum_t *out);
  70 extern enum zio_checksum spa_dedup_checksum(spa_t *spa);
  71
  72 #ifdef  __cplusplus
  73 }
  74 #endif
  75
  76 #endif  /* _SYS_ZIO_CHECKSUM_H */