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 * Copyright 2013 by Saso Kiselkov. All rights reserved.
25 */
26
27#ifndef _ZIO_H
28#define	_ZIO_H
29
30#define	ZEC_MAGIC	0x210da7ab10c7a11ULL	/* zio data bloc tail */
31
32typedef struct zio_eck {
33	uint64_t	zec_magic;	/* for validation, endianness	*/
34	zio_cksum_t	zec_cksum;	/* 256-bit checksum		*/
35} zio_eck_t;
36
37/*
38 * Gang block headers are self-checksumming and contain an array
39 * of block pointers.
40 */
41#define	SPA_GANGBLOCKSIZE	SPA_MINBLOCKSIZE
42#define	SPA_GBH_NBLKPTRS	((SPA_GANGBLOCKSIZE - \
43	sizeof (zio_eck_t)) / sizeof (blkptr_t))
44#define	SPA_GBH_FILLER		((SPA_GANGBLOCKSIZE - \
45	sizeof (zio_eck_t) - \
46	(SPA_GBH_NBLKPTRS * sizeof (blkptr_t))) /\
47	sizeof (uint64_t))
48
49#define	ZIO_GET_IOSIZE(zio)	\
50	(BP_IS_GANG((zio)->io_bp) ? \
51	SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))
52
53typedef struct zio_gbh {
54	blkptr_t		zg_blkptr[SPA_GBH_NBLKPTRS];
55	uint64_t		zg_filler[SPA_GBH_FILLER];
56	zio_eck_t		zg_tail;
57} zio_gbh_phys_t;
58
59enum zio_checksum {
60	ZIO_CHECKSUM_INHERIT = 0,
61	ZIO_CHECKSUM_ON,
62	ZIO_CHECKSUM_OFF,
63	ZIO_CHECKSUM_LABEL,
64	ZIO_CHECKSUM_GANG_HEADER,
65	ZIO_CHECKSUM_ZILOG,
66	ZIO_CHECKSUM_FLETCHER_2,
67	ZIO_CHECKSUM_FLETCHER_4,
68	ZIO_CHECKSUM_SHA256,
69	ZIO_CHECKSUM_ZILOG2,
70	ZIO_CHECKSUM_NOPARITY,
71	ZIO_CHECKSUM_SHA512,
72	ZIO_CHECKSUM_SKEIN,
73	ZIO_CHECKSUM_EDONR,
74	ZIO_CHECKSUM_FUNCTIONS
75};
76
77enum zio_compress {
78	ZIO_COMPRESS_INHERIT = 0,
79	ZIO_COMPRESS_ON,
80	ZIO_COMPRESS_OFF,
81	ZIO_COMPRESS_LZJB,
82	ZIO_COMPRESS_EMPTY,
83	ZIO_COMPRESS_GZIP_1,
84	ZIO_COMPRESS_GZIP_2,
85	ZIO_COMPRESS_GZIP_3,
86	ZIO_COMPRESS_GZIP_4,
87	ZIO_COMPRESS_GZIP_5,
88	ZIO_COMPRESS_GZIP_6,
89	ZIO_COMPRESS_GZIP_7,
90	ZIO_COMPRESS_GZIP_8,
91	ZIO_COMPRESS_GZIP_9,
92	ZIO_COMPRESS_ZLE,
93	ZIO_COMPRESS_LZ4,
94	ZIO_COMPRESS_FUNCTIONS
95};
96
97#endif	/* _ZIO_H */
98