69 lines
2.2 KiB
C
69 lines
2.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
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*/
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/*
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* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _SYS_DNODE_H
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#define _SYS_DNODE_H
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#include <zfs/spa.h>
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/*
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* Fixed constants.
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*/
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#define DNODE_SHIFT 9 /* 512 bytes */
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#define DN_MIN_INDBLKSHIFT 10 /* 1k */
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#define DN_MAX_INDBLKSHIFT 14 /* 16k */
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#define DNODE_BLOCK_SHIFT 14 /* 16k */
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#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
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#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
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#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
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/*
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* Derived constants.
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*/
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#define DNODE_SIZE (1 << DNODE_SHIFT)
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#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
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#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
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#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
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#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
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#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
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#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
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#define DNODE_FLAG_SPILL_BLKPTR (1<<2)
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#define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \
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(((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t))))
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typedef struct dnode_phys {
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uint8_t dn_type; /* dmu_object_type_t */
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uint8_t dn_indblkshift; /* ln2(indirect block size) */
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uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
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uint8_t dn_nblkptr; /* length of dn_blkptr */
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uint8_t dn_bonustype; /* type of data in bonus buffer */
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uint8_t dn_checksum; /* ZIO_CHECKSUM type */
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uint8_t dn_compress; /* ZIO_COMPRESS type */
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uint8_t dn_flags; /* DNODE_FLAG_* */
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uint16_t dn_datablkszsec; /* data block size in 512b sectors */
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uint16_t dn_bonuslen; /* length of dn_bonus */
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uint8_t dn_pad2[4];
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/* accounting is protected by dn_dirty_mtx */
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uint64_t dn_maxblkid; /* largest allocated block ID */
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uint64_t dn_used; /* bytes (or sectors) of disk space */
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uint64_t dn_pad3[4];
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blkptr_t dn_blkptr[1];
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uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)];
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blkptr_t dn_spill;
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} dnode_phys_t;
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#endif /* _SYS_DNODE_H */
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