| Jorgen Lundman | 4d3c95f | 2012-07-19 20:48:25 +0000 | [diff] [blame] | 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 */ |