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 #ifndef _SYS_DNODE_H 25 #define _SYS_DNODE_H 26 27 #include <zfs/spa.h> 28 29 /* 30 * Fixed constants. 31 */ 32 #define DNODE_SHIFT 9 /* 512 bytes */ 33 #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 34 #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 35 #define DNODE_BLOCK_SHIFT 14 /* 16k */ 36 #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 37 #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 38 #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 39 40 /* 41 * Derived constants. 42 */ 43 #define DNODE_SIZE (1 << DNODE_SHIFT) 44 #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 45 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 46 #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 47 48 #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 49 #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 50 #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 51 52 #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 53 54 #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ 55 (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) 56 57 typedef struct dnode_phys { 58 uint8_t dn_type; /* dmu_object_type_t */ 59 uint8_t dn_indblkshift; /* ln2(indirect block size) */ 60 uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 61 uint8_t dn_nblkptr; /* length of dn_blkptr */ 62 uint8_t dn_bonustype; /* type of data in bonus buffer */ 63 uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 64 uint8_t dn_compress; /* ZIO_COMPRESS type */ 65 uint8_t dn_flags; /* DNODE_FLAG_* */ 66 uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 67 uint16_t dn_bonuslen; /* length of dn_bonus */ 68 uint8_t dn_pad2[4]; 69 70 /* accounting is protected by dn_dirty_mtx */ 71 uint64_t dn_maxblkid; /* largest allocated block ID */ 72 uint64_t dn_used; /* bytes (or sectors) of disk space */ 73 74 uint64_t dn_pad3[4]; 75 76 blkptr_t dn_blkptr[1]; 77 uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; 78 blkptr_t dn_spill; 79 } dnode_phys_t; 80 81 #endif /* _SYS_DNODE_H */ 82