include/zfs/zio.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  */
   7 /*
   8  * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
   9  */
  10
  11 #ifndef _ZIO_H
  12 #define _ZIO_H
  13
  14 #include <zfs/spa.h>
  15
  16 #define ZEC_MAGIC       0x210da7ab10c7a11ULL    /* zio data bloc tail */
  17
  18 typedef struct zio_eck {
  19         uint64_t        zec_magic;      /* for validation, endianness   */
  20         zio_cksum_t     zec_cksum;      /* 256-bit checksum             */
  21 } zio_eck_t;
  22
  23 /*
  24  * Gang block headers are self-checksumming and contain an array
  25  * of block pointers.
  26  */
  27 #define SPA_GANGBLOCKSIZE       SPA_MINBLOCKSIZE
  28 #define SPA_GBH_NBLKPTRS        ((SPA_GANGBLOCKSIZE - \
  29         sizeof(zio_eck_t)) / sizeof(blkptr_t))
  30 #define SPA_GBH_FILLER          ((SPA_GANGBLOCKSIZE - \
  31         sizeof(zio_eck_t) - \
  32         (SPA_GBH_NBLKPTRS * sizeof(blkptr_t))) /\
  33         sizeof(uint64_t))
  34
  35 #define ZIO_GET_IOSIZE(zio)     \
  36         (BP_IS_GANG((zio)->io_bp) ? \
  37         SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
  38
  39 typedef struct zio_gbh {
  40         blkptr_t                zg_blkptr[SPA_GBH_NBLKPTRS];
  41         uint64_t                zg_filler[SPA_GBH_FILLER];
  42         zio_eck_t               zg_tail;
  43 } zio_gbh_phys_t;
  44
  45 enum zio_checksum {
  46         ZIO_CHECKSUM_INHERIT = 0,
  47         ZIO_CHECKSUM_ON,
  48         ZIO_CHECKSUM_OFF,
  49         ZIO_CHECKSUM_LABEL,
  50         ZIO_CHECKSUM_GANG_HEADER,
  51         ZIO_CHECKSUM_ZILOG,
  52         ZIO_CHECKSUM_FLETCHER_2,
  53         ZIO_CHECKSUM_FLETCHER_4,
  54         ZIO_CHECKSUM_SHA256,
  55         ZIO_CHECKSUM_ZILOG2,
  56         ZIO_CHECKSUM_FUNCTIONS
  57 };
  58
  59 #define ZIO_CHECKSUM_ON_VALUE   ZIO_CHECKSUM_FLETCHER_2
  60 #define ZIO_CHECKSUM_DEFAULT    ZIO_CHECKSUM_ON
  61
  62 enum zio_compress {
  63         ZIO_COMPRESS_INHERIT = 0,
  64         ZIO_COMPRESS_ON,
  65         ZIO_COMPRESS_OFF,
  66         ZIO_COMPRESS_LZJB,
  67         ZIO_COMPRESS_EMPTY,
  68         ZIO_COMPRESS_GZIP1,
  69         ZIO_COMPRESS_GZIP2,
  70         ZIO_COMPRESS_GZIP3,
  71         ZIO_COMPRESS_GZIP4,
  72         ZIO_COMPRESS_GZIP5,
  73         ZIO_COMPRESS_GZIP6,
  74         ZIO_COMPRESS_GZIP7,
  75         ZIO_COMPRESS_GZIP8,
  76         ZIO_COMPRESS_GZIP9,
  77         ZIO_COMPRESS_FUNCTIONS
  78 };
  79
  80 #endif  /* _ZIO_H */