usr/src/uts/common/sys/lvm/md_crc.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #ifndef _SYS_MD_CRC_H
  28 #define _SYS_MD_CRC_H
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"
  31
  32 #include <sys/types.h>
  33
  34 #ifdef  __cplusplus
  35 extern "C" {
  36 #endif
  37
  38 /* md_crc.c */
  39 /*
  40  * Structure to hold fields to be skipped when calculating the checksum
  41  */
  42 typedef struct crc_skip {
  43         struct crc_skip *skip_next;
  44         int             skip_offset;
  45         int             skip_size;
  46 } crc_skip_t;
  47
  48 extern uint_t                   crcfunc(uint_t check,
  49                                     uchar_t *record,
  50                                     uint_t *result,
  51                                     size_t size,
  52                                     crc_skip_t *skip);
  53 extern void                     crcfreetab(void);
  54
  55 /*
  56  * The following crc defines allow for a number of areas to be skipped
  57  * (not be included in the data being crc'd) in the record
  58  * block (mddb_rb_32). These areas are the 12 byte area covering
  59  *      rb_checksum_fiddle, rb_private and rb_userdata
  60  *
  61  * In addition the skipped areas include the timestamps in the crc for
  62  * MN disksets.
  63  */
  64 #ifndef DEBUG
  65 #define crcgen(record, result, size, skip) \
  66         (void) crcfunc(0, (uchar_t *)(record), (uint_t *)(result), \
  67             (size_t)(size), (crc_skip_t *)(skip))
  68
  69 #else /* DEBUG */
  70
  71 #ifdef  _KERNEL
  72 #define crcgen(record, result, size, skip)              {\
  73         uint_t b = crcfunc(0, (uchar_t *)(record), (uint_t *)(result), \
  74             (size_t)(size), (crc_skip_t *)(skip)); \
  75         (void) crcfunc(0, (uchar_t *)(record), (uint_t *)(result), \
  76             (size_t)(size), (crc_skip_t *)(skip)); \
  77         ASSERT (*((uint_t *)(result)) == b); \
  78 }
  79 #else   /* !_KERNEL */
  80 #define crcgen(record, result, size, skip)              {\
  81         uint_t b = crcfunc(0, (uchar_t *)(record), (uint_t *)(result), \
  82             (size_t)(size), (crc_skip_t *)(skip)); \
  83         (void) crcfunc(0, (uchar_t *)(record), (uint_t *)(result), \
  84             (size_t)(size), (crc_skip_t *)(skip)); \
  85         assert (*((uint_t *)(result)) == b); \
  86 }
  87 #endif  /* _KERNEL */
  88 #endif  /* DEBUG */
  89
  90 #define crcchk(record, result, size, skip) crcfunc(1, (uchar_t *)(record), \
  91         (uint_t *)(result), (size_t)(size), (crc_skip_t *)(skip))
  92
  93 #ifdef  __cplusplus
  94 }
  95 #endif
  96
  97 #endif  /* _SYS_MD_CRC_H */