projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 4d3c95f5 JL |
1 | /* |
| 2 | * GRUB -- GRand Unified Bootloader | |
| 3 | * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. | |
| 4 | * | |
| 1a459660 | 5 | * SPDX-License-Identifier: GPL-2.0+ |
| 4d3c95f5 JL |
6 | */ |
| 7 | /* | |
| 8 | * Copyright 2010 Sun Microsystems, Inc. All rights reserved. | |
| 9 | * Use is subject to license terms. | |
| 10 | */ | |
| 11 | ||
| 12 | #ifndef _SYS_DNODE_H | |
| 13 | #define _SYS_DNODE_H | |
| 14 | ||
| 15 | #include <zfs/spa.h> | |
| 16 | ||
| 17 | /* | |
| 18 | * Fixed constants. | |
| 19 | */ | |
| 20 | #define DNODE_SHIFT 9 /* 512 bytes */ | |
| 21 | #define DN_MIN_INDBLKSHIFT 10 /* 1k */ | |
| 22 | #define DN_MAX_INDBLKSHIFT 14 /* 16k */ | |
| 23 | #define DNODE_BLOCK_SHIFT 14 /* 16k */ | |
| 24 | #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ | |
| 25 | #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ | |
| 26 | #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ | |
| 27 | ||
| 28 | /* | |
| 29 | * Derived constants. | |
| 30 | */ | |
| 31 | #define DNODE_SIZE (1 << DNODE_SHIFT) | |
| 32 | #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) | |
| 33 | #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) | |
| 34 | #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) | |
| 35 | ||
| 36 | #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) | |
| 37 | #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) | |
| 38 | #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) | |
| 39 | ||
| 40 | #define DNODE_FLAG_SPILL_BLKPTR (1<<2) | |
| 41 | ||
| 42 | #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ | |
| 43 | (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) | |
| 44 | ||
| 45 | typedef struct dnode_phys { | |
| 46 | uint8_t dn_type; /* dmu_object_type_t */ | |
| 47 | uint8_t dn_indblkshift; /* ln2(indirect block size) */ | |
| 48 | uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ | |
| 49 | uint8_t dn_nblkptr; /* length of dn_blkptr */ | |
| 50 | uint8_t dn_bonustype; /* type of data in bonus buffer */ | |
| 51 | uint8_t dn_checksum; /* ZIO_CHECKSUM type */ | |
| 52 | uint8_t dn_compress; /* ZIO_COMPRESS type */ | |
| 53 | uint8_t dn_flags; /* DNODE_FLAG_* */ | |
| 54 | uint16_t dn_datablkszsec; /* data block size in 512b sectors */ | |
| 55 | uint16_t dn_bonuslen; /* length of dn_bonus */ | |
| 56 | uint8_t dn_pad2[4]; | |
| 57 | ||
| 58 | /* accounting is protected by dn_dirty_mtx */ | |
| 59 | uint64_t dn_maxblkid; /* largest allocated block ID */ | |
| 60 | uint64_t dn_used; /* bytes (or sectors) of disk space */ | |
| 61 | ||
| 62 | uint64_t dn_pad3[4]; | |
| 63 | ||
| 64 | blkptr_t dn_blkptr[1]; | |
| 65 | uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; | |
| 66 | blkptr_t dn_spill; | |
| 67 | } dnode_phys_t; | |
| 68 | ||
| 69 | #endif /* _SYS_DNODE_H */ |