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 (c) 2014 by Delphix. All rights reserved.
25 */
26
27#ifndef	_SYS_DNODE_H
28#define	_SYS_DNODE_H
29
30/*
31 * Fixed constants.
32 */
33#define	DNODE_SHIFT		9	/* 512 bytes */
34#define	DN_MIN_INDBLKSHIFT	12	/* 4k */
35#define	DN_MAX_INDBLKSHIFT	14	/* 16k */
36#define	DNODE_BLOCK_SHIFT	14	/* 16k */
37#define	DNODE_CORE_SIZE		64	/* 64 bytes for dnode sans blkptrs */
38#define	DN_MAX_OBJECT_SHIFT	48	/* 256 trillion (zfs_fid_t limit) */
39#define	DN_MAX_OFFSET_SHIFT	64	/* 2^64 bytes in a dnode */
40
41/*
42 * Derived constants.
43 */
44#define	DNODE_SIZE	(1 << DNODE_SHIFT)
45#define	DN_MAX_NBLKPTR	((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
46#define	DN_MAX_BONUSLEN	(DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
47#define	DN_MAX_OBJECT	(1ULL << DN_MAX_OBJECT_SHIFT)
48
49#define	DNODES_PER_BLOCK_SHIFT	(DNODE_BLOCK_SHIFT - DNODE_SHIFT)
50#define	DNODES_PER_BLOCK	(1ULL << DNODES_PER_BLOCK_SHIFT)
51#define	DNODES_PER_LEVEL_SHIFT	(DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
52
53#define	DNODE_FLAG_SPILL_BLKPTR (1<<2)
54
55#define	DN_BONUS(dnp)	((void*)((dnp)->dn_bonus + \
56	(((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
57
58typedef struct dnode_phys {
59	uint8_t dn_type;		/* dmu_object_type_t */
60	uint8_t dn_indblkshift;		/* ln2(indirect block size) */
61	uint8_t dn_nlevels;		/* 1=dn_blkptr->data blocks */
62	uint8_t dn_nblkptr;		/* length of dn_blkptr */
63	uint8_t dn_bonustype;		/* type of data in bonus buffer */
64	uint8_t	dn_checksum;		/* ZIO_CHECKSUM type */
65	uint8_t	dn_compress;		/* ZIO_COMPRESS type */
66	uint8_t dn_flags;		/* DNODE_FLAG_* */
67	uint16_t dn_datablkszsec;	/* data block size in 512b sectors */
68	uint16_t dn_bonuslen;		/* length of dn_bonus */
69	uint8_t dn_pad2[4];
70
71	/* accounting is protected by dn_dirty_mtx */
72	uint64_t dn_maxblkid;		/* largest allocated block ID */
73	uint64_t dn_used;		/* bytes (or sectors) of disk space */
74
75	uint64_t dn_pad3[4];
76
77	blkptr_t dn_blkptr[1];
78	uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
79	blkptr_t dn_spill;
80} dnode_phys_t;
81
82#endif	/* _SYS_DNODE_H */
83