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 #ifndef _ZIO_H
  25 #define _ZIO_H
  26 
  27 #define ZEC_MAGIC       0x210da7ab10c7a11ULL    /* zio data bloc tail */
  28 
  29 typedef struct zio_eck {
  30         uint64_t        zec_magic;      /* for validation, endianness   */
  31         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
  32 } zio_eck_t;
  33 
  34 /*
  35  * Gang block headers are self-checksumming and contain an array
  36  * of block pointers.
  37  */
  38 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
  39 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
  40         sizeof (zio_eck_t)) / sizeof (blkptr_t))
  41 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
  42         sizeof (zio_eck_t) - \
  43         (SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
  44         sizeof (uint64_t))
  45 
  46 #define ZIO_GET_IOSIZE(zio)     \
  47         (BP_IS_GANG((zio)->io_bp) ? \
  48         SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
  49 
  50 typedef struct zio_gbh {
  51         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
  52         uint64_t                zg_filler[SPA_GBH_FILLER];
  53         zio_eck_t               zg_tail;
  54 } zio_gbh_phys_t;
  55 
  56 enum zio_checksum {
  57         ZIO_CHECKSUM_INHERIT = 0,
  58         ZIO_CHECKSUM_ON,
  59         ZIO_CHECKSUM_OFF,
  60         ZIO_CHECKSUM_LABEL,
  61         ZIO_CHECKSUM_GANG_HEADER,
  62         ZIO_CHECKSUM_ZILOG,
  63         ZIO_CHECKSUM_FLETCHER_2,
  64         ZIO_CHECKSUM_FLETCHER_4,
  65         ZIO_CHECKSUM_SHA256,
  66         ZIO_CHECKSUM_ZILOG2,
  67         ZIO_CHECKSUM_FUNCTIONS
  68 };
  69 
  70 enum zio_compress {
  71         ZIO_COMPRESS_INHERIT = 0,
  72         ZIO_COMPRESS_ON,
  73         ZIO_COMPRESS_OFF,
  74         ZIO_COMPRESS_LZJB,
  75         ZIO_COMPRESS_EMPTY,
  76         ZIO_COMPRESS_FUNCTIONS
  77 };
  78 
  79 #endif  /* _ZIO_H */