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