1b1b8ab34Slling /* 2b1b8ab34Slling * GRUB -- GRand Unified Bootloader 3b1b8ab34Slling * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4b1b8ab34Slling * 5b1b8ab34Slling * This program is free software; you can redistribute it and/or modify 6b1b8ab34Slling * it under the terms of the GNU General Public License as published by 7b1b8ab34Slling * the Free Software Foundation; either version 2 of the License, or 8b1b8ab34Slling * (at your option) any later version. 9b1b8ab34Slling * 10b1b8ab34Slling * This program is distributed in the hope that it will be useful, 11b1b8ab34Slling * but WITHOUT ANY WARRANTY; without even the implied warranty of 12b1b8ab34Slling * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13b1b8ab34Slling * GNU General Public License for more details. 14b1b8ab34Slling * 15b1b8ab34Slling * You should have received a copy of the GNU General Public License 16b1b8ab34Slling * along with this program; if not, write to the Free Software 17b1b8ab34Slling * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 18b1b8ab34Slling */ 19b1b8ab34Slling /* 20*0a586ceaSMark Shellenbaum * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 21b1b8ab34Slling * Use is subject to license terms. 22b1b8ab34Slling */ 23b1b8ab34Slling 24b1b8ab34Slling #ifndef _SYS_DNODE_H 25b1b8ab34Slling #define _SYS_DNODE_H 26b1b8ab34Slling 27b1b8ab34Slling /* 28b1b8ab34Slling * Fixed constants. 29b1b8ab34Slling */ 30b1b8ab34Slling #define DNODE_SHIFT 9 /* 512 bytes */ 31b1b8ab34Slling #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 32b1b8ab34Slling #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 33b1b8ab34Slling #define DNODE_BLOCK_SHIFT 14 /* 16k */ 34b1b8ab34Slling #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 35b1b8ab34Slling #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 36b1b8ab34Slling #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 37b1b8ab34Slling 38b1b8ab34Slling /* 39b1b8ab34Slling * Derived constants. 40b1b8ab34Slling */ 41b1b8ab34Slling #define DNODE_SIZE (1 << DNODE_SHIFT) 42b1b8ab34Slling #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 43b1b8ab34Slling #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 44b1b8ab34Slling #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 45b1b8ab34Slling 46b1b8ab34Slling #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 47b1b8ab34Slling #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 48b1b8ab34Slling #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 49b1b8ab34Slling 50*0a586ceaSMark Shellenbaum #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 51*0a586ceaSMark Shellenbaum 52b1b8ab34Slling #define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \ 53b1b8ab34Slling (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t)))) 54b1b8ab34Slling 55b1b8ab34Slling typedef struct dnode_phys { 56b1b8ab34Slling uint8_t dn_type; /* dmu_object_type_t */ 57b1b8ab34Slling uint8_t dn_indblkshift; /* ln2(indirect block size) */ 58b1b8ab34Slling uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 59b1b8ab34Slling uint8_t dn_nblkptr; /* length of dn_blkptr */ 60b1b8ab34Slling uint8_t dn_bonustype; /* type of data in bonus buffer */ 61b1b8ab34Slling uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 62b1b8ab34Slling uint8_t dn_compress; /* ZIO_COMPRESS type */ 63b1b8ab34Slling uint8_t dn_flags; /* DNODE_FLAG_* */ 64b1b8ab34Slling uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 65b1b8ab34Slling uint16_t dn_bonuslen; /* length of dn_bonus */ 66b1b8ab34Slling uint8_t dn_pad2[4]; 67b1b8ab34Slling 68b1b8ab34Slling /* accounting is protected by dn_dirty_mtx */ 69b1b8ab34Slling uint64_t dn_maxblkid; /* largest allocated block ID */ 70b1b8ab34Slling uint64_t dn_used; /* bytes (or sectors) of disk space */ 71b1b8ab34Slling 72b1b8ab34Slling uint64_t dn_pad3[4]; 73b1b8ab34Slling 74b1b8ab34Slling blkptr_t dn_blkptr[1]; 75*0a586ceaSMark Shellenbaum uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)]; 76*0a586ceaSMark Shellenbaum blkptr_t dn_spill; 77b1b8ab34Slling } dnode_phys_t; 78b1b8ab34Slling 79b1b8ab34Slling #endif /* _SYS_DNODE_H */ 80