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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 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Jorgen Lundman4d3c95f2012-07-19 20:48:25 +00006 */
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
18typedef 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
39typedef 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
45enum 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
62enum 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 */