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

/*
 *  GRUB  --  GRand Unified Bootloader
 *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
 *
 * SPDX-License-Identifier:	GPL-2.0+
 */
/*
 * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#ifndef	_SYS_DNODE_H
#define	_SYS_DNODE_H

#include <zfs/spa.h>

/*
 * Fixed constants.
 */
#define	DNODE_SHIFT		9	/* 512 bytes */
#define	DN_MIN_INDBLKSHIFT	10	/* 1k */
#define	DN_MAX_INDBLKSHIFT	14	/* 16k */
#define	DNODE_BLOCK_SHIFT	14	/* 16k */
#define	DNODE_CORE_SIZE		64	/* 64 bytes for dnode sans blkptrs */
#define	DN_MAX_OBJECT_SHIFT	48	/* 256 trillion (zfs_fid_t limit) */
#define	DN_MAX_OFFSET_SHIFT	64	/* 2^64 bytes in a dnode */

/*
 * Derived constants.
 */
#define	DNODE_SIZE	(1 << DNODE_SHIFT)
#define	DN_MAX_NBLKPTR	((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
#define	DN_MAX_BONUSLEN	(DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
#define	DN_MAX_OBJECT	(1ULL << DN_MAX_OBJECT_SHIFT)

#define	DNODES_PER_BLOCK_SHIFT	(DNODE_BLOCK_SHIFT - DNODE_SHIFT)
#define	DNODES_PER_BLOCK	(1ULL << DNODES_PER_BLOCK_SHIFT)
#define	DNODES_PER_LEVEL_SHIFT	(DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)

#define	DNODE_FLAG_SPILL_BLKPTR (1<<2)

#define	DN_BONUS(dnp)	((void *)((dnp)->dn_bonus + \
	(((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t))))

typedef struct dnode_phys {
	uint8_t dn_type;		/* dmu_object_type_t */
	uint8_t dn_indblkshift;		/* ln2(indirect block size) */
	uint8_t dn_nlevels;		/* 1=dn_blkptr->data blocks */
	uint8_t dn_nblkptr;		/* length of dn_blkptr */
	uint8_t dn_bonustype;		/* type of data in bonus buffer */
	uint8_t	dn_checksum;		/* ZIO_CHECKSUM type */
	uint8_t	dn_compress;		/* ZIO_COMPRESS type */
	uint8_t dn_flags;		/* DNODE_FLAG_* */
	uint16_t dn_datablkszsec;	/* data block size in 512b sectors */
	uint16_t dn_bonuslen;		/* length of dn_bonus */
	uint8_t dn_pad2[4];

	/* accounting is protected by dn_dirty_mtx */
	uint64_t dn_maxblkid;		/* largest allocated block ID */
	uint64_t dn_used;		/* bytes (or sectors) of disk space */

	uint64_t dn_pad3[4];

	blkptr_t dn_blkptr[1];
	uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)];
	blkptr_t dn_spill;
} dnode_phys_t;

#endif	/* _SYS_DNODE_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	*
1a459660	5	* SPDX-License-Identifier: GPL-2.0+
4d3c95f5 JL	6	*/
	7	/*
	8	* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
	9	* Use is subject to license terms.
	10	*/
	11
	12	#ifndef _SYS_DNODE_H
	13	#define _SYS_DNODE_H
	14
	15	#include <zfs/spa.h>
	16
	17	/*
	18	* Fixed constants.
	19	*/
	20	#define DNODE_SHIFT 9 /* 512 bytes */
	21	#define DN_MIN_INDBLKSHIFT 10 /* 1k */
	22	#define DN_MAX_INDBLKSHIFT 14 /* 16k */
	23	#define DNODE_BLOCK_SHIFT 14 /* 16k */
	24	#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
	25	#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
	26	#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
	27
	28	/*
	29	* Derived constants.
	30	*/
	31	#define DNODE_SIZE (1 << DNODE_SHIFT)
	32	#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
	33	#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
	34	#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
	35
	36	#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
	37	#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
	38	#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
	39
	40	#define DNODE_FLAG_SPILL_BLKPTR (1<<2)
	41
	42	#define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \
	43	(((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t))))
	44
	45	typedef struct dnode_phys {
	46	uint8_t dn_type; /* dmu_object_type_t */
	47	uint8_t dn_indblkshift; /* ln2(indirect block size) */
	48	uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
	49	uint8_t dn_nblkptr; /* length of dn_blkptr */
	50	uint8_t dn_bonustype; /* type of data in bonus buffer */
	51	uint8_t dn_checksum; /* ZIO_CHECKSUM type */
	52	uint8_t dn_compress; /* ZIO_COMPRESS type */
	53	uint8_t dn_flags; /* DNODE_FLAG_* */
	54	uint16_t dn_datablkszsec; /* data block size in 512b sectors */
	55	uint16_t dn_bonuslen; /* length of dn_bonus */
	56	uint8_t dn_pad2[4];
	57
	58	/* accounting is protected by dn_dirty_mtx */
	59	uint64_t dn_maxblkid; /* largest allocated block ID */
	60	uint64_t dn_used; /* bytes (or sectors) of disk space */
	61
	62	uint64_t dn_pad3[4];
	63
	64	blkptr_t dn_blkptr[1];
	65	uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)];
	66	blkptr_t dn_spill;
	67	} dnode_phys_t;
	68
	69	#endif /* _SYS_DNODE_H */