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Jorgen Lundman4d3c95f2012-07-19 20:48:25 +00001/*
2 * GRUB -- GRand Unified Bootloader
3 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
4 *
Wolfgang Denk1a459662013-07-08 09:37:19 +02005 * SPDX-License-Identifier: GPL-2.0+
Jorgen Lundman4d3c95f2012-07-19 20:48:25 +00006 */
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
45typedef 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 */