[people/ms/u-boot.git] / include / zfs / zio.h

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */
/*
 * Copyright (c) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#ifndef _ZIO_H
#define	_ZIO_H

#include <zfs/spa.h>

#define	ZEC_MAGIC	0x210da7ab10c7a11ULL	/* zio data bloc tail */

typedef struct zio_eck {
	uint64_t	zec_magic;	/* for validation, endianness	*/
	zio_cksum_t	zec_cksum;	/* 256-bit checksum		*/
} zio_eck_t;

/*
 * Gang block headers are self-checksumming and contain an array
 * of block pointers.
 */
#define	SPA_GANGBLOCKSIZE	SPA_MINBLOCKSIZE
#define	SPA_GBH_NBLKPTRS	((SPA_GANGBLOCKSIZE - \
	sizeof(zio_eck_t)) / sizeof(blkptr_t))
#define	SPA_GBH_FILLER		((SPA_GANGBLOCKSIZE - \
	sizeof(zio_eck_t) - \
	(SPA_GBH_NBLKPTRS * sizeof(blkptr_t))) /\
	sizeof(uint64_t))

#define	ZIO_GET_IOSIZE(zio)	\
	(BP_IS_GANG((zio)->io_bp) ? \
	SPA_GANGBLOCKSIZE : BP_GET_PSIZE((zio)->io_bp))

typedef struct zio_gbh {
	blkptr_t		zg_blkptr[SPA_GBH_NBLKPTRS];
	uint64_t		zg_filler[SPA_GBH_FILLER];
	zio_eck_t		zg_tail;
} zio_gbh_phys_t;

enum zio_checksum {
	ZIO_CHECKSUM_INHERIT = 0,
	ZIO_CHECKSUM_ON,
	ZIO_CHECKSUM_OFF,
	ZIO_CHECKSUM_LABEL,
	ZIO_CHECKSUM_GANG_HEADER,
	ZIO_CHECKSUM_ZILOG,
	ZIO_CHECKSUM_FLETCHER_2,
	ZIO_CHECKSUM_FLETCHER_4,
	ZIO_CHECKSUM_SHA256,
	ZIO_CHECKSUM_ZILOG2,
	ZIO_CHECKSUM_FUNCTIONS
};

#define	ZIO_CHECKSUM_ON_VALUE	ZIO_CHECKSUM_FLETCHER_2
#define	ZIO_CHECKSUM_DEFAULT	ZIO_CHECKSUM_ON

enum zio_compress {
	ZIO_COMPRESS_INHERIT = 0,
	ZIO_COMPRESS_ON,
	ZIO_COMPRESS_OFF,
	ZIO_COMPRESS_LZJB,
	ZIO_COMPRESS_EMPTY,
	ZIO_COMPRESS_GZIP1,
	ZIO_COMPRESS_GZIP2,
	ZIO_COMPRESS_GZIP3,
	ZIO_COMPRESS_GZIP4,
	ZIO_COMPRESS_GZIP5,
	ZIO_COMPRESS_GZIP6,
	ZIO_COMPRESS_GZIP7,
	ZIO_COMPRESS_GZIP8,
	ZIO_COMPRESS_GZIP9,
	ZIO_COMPRESS_FUNCTIONS
};

#endif	/* _ZIO_H */
Commit	Line	Data
4d3c95f5 JL	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 (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
	30	typedef 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
	51	typedef 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
	57	enum 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
74	enum 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 */