1 /* SPDX-License-Identifier: GPL-2.0+ */ 2 /* 3 * GRUB -- GRand Unified Bootloader 4 * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 5 */ 6 /* 7 * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 8 * Use is subject to license terms. 9 */ 10 11 #ifndef _SYS_DNODE_H 12 #define _SYS_DNODE_H 13 14 #include <zfs/spa.h> 15 16 /* 17 * Fixed constants. 18 */ 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 */ 26 27 /* 28 * Derived constants. 29 */ 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) 34 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) 38 39 #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 40 41 #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ 42 (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) 43 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 */ 55 uint8_t dn_pad2[4]; 56 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 */ 60 61 uint64_t dn_pad3[4]; 62 63 blkptr_t dn_blkptr[1]; 64 uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; 65 blkptr_t dn_spill; 66 } dnode_phys_t; 67 68 #endif /* _SYS_DNODE_H */ 69