1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  *  This program is free software; you can redistribute it and/or modify
   6  *  it under the terms of the GNU General Public License as published by
   7  *  the Free Software Foundation; either version 2 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  *
  15  *  You should have received a copy of the GNU General Public License
  16  *  along with this program; if not, write to the Free Software
  17  *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18  */
  19 /*
  20  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  21  * Use is subject to license terms.
  22  */
  23 /*
  24  * Copyright 2013 by Saso Kiselkov. All rights reserved.
  25  */
  26 
  27 #ifndef _ZIO_H
  28 #define _ZIO_H
  29 
  30 #define ZEC_MAGIC       0x210da7ab10c7a11ULL    /* zio data bloc tail */
  31 
  32 typedef struct zio_eck {
  33         uint64_t        zec_magic;      /* for validation, endianness   */
  34         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
  35 } zio_eck_t;
  36 
  37 /*
  38  * Gang block headers are self-checksumming and contain an array
  39  * of block pointers.
  40  */
  41 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
  42 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
  43         sizeof (zio_eck_t)) / sizeof (blkptr_t))
  44 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
  45         sizeof (zio_eck_t) - \
  46         (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
  47         sizeof (uint64_t))
  48 
  49 #define ZIO_GET_IOSIZE(zio)     \
  50         (BP_IS_GANG((zio)->io_bp) ? \
  51         SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
  52 
  53 typedef struct zio_gbh {
  54         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
  55         uint64_t                zg_filler[SPA_GBH_FILLER];
  56         zio_eck_t               zg_tail;
  57 } zio_gbh_phys_t;
  58 
  59 enum zio_checksum {
  60         ZIO_CHECKSUM_INHERIT = 0,
  61         ZIO_CHECKSUM_ON,
  62         ZIO_CHECKSUM_OFF,
  63         ZIO_CHECKSUM_LABEL,
  64         ZIO_CHECKSUM_GANG_HEADER,
  65         ZIO_CHECKSUM_ZILOG,
  66         ZIO_CHECKSUM_FLETCHER_2,
  67         ZIO_CHECKSUM_FLETCHER_4,
  68         ZIO_CHECKSUM_SHA256,
  69         ZIO_CHECKSUM_ZILOG2,
  70         ZIO_CHECKSUM_SHA512,
  71         ZIO_CHECKSUM_FUNCTIONS
  72 };
  73 
  74 enum zio_compress {
  75         ZIO_COMPRESS_INHERIT = 0,
  76         ZIO_COMPRESS_ON,
  77         ZIO_COMPRESS_OFF,
  78         ZIO_COMPRESS_LZJB,
  79         ZIO_COMPRESS_EMPTY,
  80         ZIO_COMPRESS_GZIP_1,
  81         ZIO_COMPRESS_GZIP_2,
  82         ZIO_COMPRESS_GZIP_3,
  83         ZIO_COMPRESS_GZIP_4,
  84         ZIO_COMPRESS_GZIP_5,
  85         ZIO_COMPRESS_GZIP_6,
  86         ZIO_COMPRESS_GZIP_7,
  87         ZIO_COMPRESS_GZIP_8,
  88         ZIO_COMPRESS_GZIP_9,
  89         ZIO_COMPRESS_ZLE,
  90         ZIO_COMPRESS_LZ4,
  91         ZIO_COMPRESS_FUNCTIONS
  92 };
  93 
  94 #endif  /* _ZIO_H */