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Jorgen Lundman4d3c95f2012-07-19 20:48:25 +00001/*
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 (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
21 */
22
23#ifndef _ZIO_H
24#define _ZIO_H
25
26#include <zfs/spa.h>
27
28#define ZEC_MAGIC 0x210da7ab10c7a11ULL /* zio data bloc tail */
29
30typedef struct zio_eck {
31 uint64_t zec_magic; /* for validation, endianness */
32 zio_cksum_t zec_cksum; /* 256-bit checksum */
33} zio_eck_t;
34
35/*
36 * Gang block headers are self-checksumming and contain an array
37 * of block pointers.
38 */
39#define SPA_GANGBLOCKSIZE SPA_MINBLOCKSIZE
40#define SPA_GBH_NBLKPTRS ((SPA_GANGBLOCKSIZE - \
41 sizeof(zio_eck_t)) / sizeof(blkptr_t))
42#define SPA_GBH_FILLER ((SPA_GANGBLOCKSIZE - \
43 sizeof(zio_eck_t) - \
44 (SPA_GBH_NBLKPTRS * sizeof(blkptr_t))) /\
45 sizeof(uint64_t))
46
47#define ZIO_GET_IOSIZE(zio) \
48 (BP_IS_GANG((zio)->io_bp) ? \
49 SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
50
51typedef struct zio_gbh {
52 blkptr_t zg_blkptr[SPA_GBH_NBLKPTRS];
53 uint64_t zg_filler[SPA_GBH_FILLER];
54 zio_eck_t zg_tail;
55} zio_gbh_phys_t;
56
57enum zio_checksum {
58 ZIO_CHECKSUM_INHERIT = 0,
59 ZIO_CHECKSUM_ON,
60 ZIO_CHECKSUM_OFF,
61 ZIO_CHECKSUM_LABEL,
62 ZIO_CHECKSUM_GANG_HEADER,
63 ZIO_CHECKSUM_ZILOG,
64 ZIO_CHECKSUM_FLETCHER_2,
65 ZIO_CHECKSUM_FLETCHER_4,
66 ZIO_CHECKSUM_SHA256,
67 ZIO_CHECKSUM_ZILOG2,
68 ZIO_CHECKSUM_FUNCTIONS
69};
70
71#define ZIO_CHECKSUM_ON_VALUE ZIO_CHECKSUM_FLETCHER_2
72#define ZIO_CHECKSUM_DEFAULT ZIO_CHECKSUM_ON
73
74enum 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_GZIP1,
81 ZIO_COMPRESS_GZIP2,
82 ZIO_COMPRESS_GZIP3,
83 ZIO_COMPRESS_GZIP4,
84 ZIO_COMPRESS_GZIP5,
85 ZIO_COMPRESS_GZIP6,
86 ZIO_COMPRESS_GZIP7,
87 ZIO_COMPRESS_GZIP8,
88 ZIO_COMPRESS_GZIP9,
89 ZIO_COMPRESS_FUNCTIONS
90};
91
92#endif /* _ZIO_H */