1 /* SPDX-License-Identifier: GPL-2.0+ */
3 * GRUB -- GRand Unified Bootloader
4 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
7 * Copyright 2010 Sun Microsystems, Inc. All rights reserved.
8 * Use is subject to license terms.
19 #define DNODE_SHIFT 9 /* 512 bytes */
20 #define DN_MIN_INDBLKSHIFT 10 /* 1k */
21 #define DN_MAX_INDBLKSHIFT 14 /* 16k */
22 #define DNODE_BLOCK_SHIFT 14 /* 16k */
23 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */
24 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */
25 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */
30 #define DNODE_SIZE (1 << DNODE_SHIFT)
31 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
32 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
33 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT)
35 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
36 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT)
37 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
39 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
41 #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \
42 (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t))))
44 typedef struct dnode_phys {
45 uint8_t dn_type; /* dmu_object_type_t */
46 uint8_t dn_indblkshift; /* ln2(indirect block size) */
47 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */
48 uint8_t dn_nblkptr; /* length of dn_blkptr */
49 uint8_t dn_bonustype; /* type of data in bonus buffer */
50 uint8_t dn_checksum; /* ZIO_CHECKSUM type */
51 uint8_t dn_compress; /* ZIO_COMPRESS type */
52 uint8_t dn_flags; /* DNODE_FLAG_* */
53 uint16_t dn_datablkszsec; /* data block size in 512b sectors */
54 uint16_t dn_bonuslen; /* length of dn_bonus */
57 /* accounting is protected by dn_dirty_mtx */
58 uint64_t dn_maxblkid; /* largest allocated block ID */
59 uint64_t dn_used; /* bytes (or sectors) of disk space */
63 blkptr_t dn_blkptr[1];
64 uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)];
68 #endif /* _SYS_DNODE_H */