1*4882a593Smuzhiyun /* 2*4882a593Smuzhiyun * GRUB -- GRand Unified Bootloader 3*4882a593Smuzhiyun * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 4*4882a593Smuzhiyun * 5*4882a593Smuzhiyun * SPDX-License-Identifier: GPL-2.0+ 6*4882a593Smuzhiyun */ 7*4882a593Smuzhiyun /* 8*4882a593Smuzhiyun * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 9*4882a593Smuzhiyun * Use is subject to license terms. 10*4882a593Smuzhiyun */ 11*4882a593Smuzhiyun 12*4882a593Smuzhiyun #ifndef _SYS_DNODE_H 13*4882a593Smuzhiyun #define _SYS_DNODE_H 14*4882a593Smuzhiyun 15*4882a593Smuzhiyun #include <zfs/spa.h> 16*4882a593Smuzhiyun 17*4882a593Smuzhiyun /* 18*4882a593Smuzhiyun * Fixed constants. 19*4882a593Smuzhiyun */ 20*4882a593Smuzhiyun #define DNODE_SHIFT 9 /* 512 bytes */ 21*4882a593Smuzhiyun #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 22*4882a593Smuzhiyun #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 23*4882a593Smuzhiyun #define DNODE_BLOCK_SHIFT 14 /* 16k */ 24*4882a593Smuzhiyun #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 25*4882a593Smuzhiyun #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 26*4882a593Smuzhiyun #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun /* 29*4882a593Smuzhiyun * Derived constants. 30*4882a593Smuzhiyun */ 31*4882a593Smuzhiyun #define DNODE_SIZE (1 << DNODE_SHIFT) 32*4882a593Smuzhiyun #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 33*4882a593Smuzhiyun #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 34*4882a593Smuzhiyun #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 35*4882a593Smuzhiyun 36*4882a593Smuzhiyun #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 37*4882a593Smuzhiyun #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 38*4882a593Smuzhiyun #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 39*4882a593Smuzhiyun 40*4882a593Smuzhiyun #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 41*4882a593Smuzhiyun 42*4882a593Smuzhiyun #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ 43*4882a593Smuzhiyun (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) 44*4882a593Smuzhiyun 45*4882a593Smuzhiyun typedef struct dnode_phys { 46*4882a593Smuzhiyun uint8_t dn_type; /* dmu_object_type_t */ 47*4882a593Smuzhiyun uint8_t dn_indblkshift; /* ln2(indirect block size) */ 48*4882a593Smuzhiyun uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 49*4882a593Smuzhiyun uint8_t dn_nblkptr; /* length of dn_blkptr */ 50*4882a593Smuzhiyun uint8_t dn_bonustype; /* type of data in bonus buffer */ 51*4882a593Smuzhiyun uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 52*4882a593Smuzhiyun uint8_t dn_compress; /* ZIO_COMPRESS type */ 53*4882a593Smuzhiyun uint8_t dn_flags; /* DNODE_FLAG_* */ 54*4882a593Smuzhiyun uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 55*4882a593Smuzhiyun uint16_t dn_bonuslen; /* length of dn_bonus */ 56*4882a593Smuzhiyun uint8_t dn_pad2[4]; 57*4882a593Smuzhiyun 58*4882a593Smuzhiyun /* accounting is protected by dn_dirty_mtx */ 59*4882a593Smuzhiyun uint64_t dn_maxblkid; /* largest allocated block ID */ 60*4882a593Smuzhiyun uint64_t dn_used; /* bytes (or sectors) of disk space */ 61*4882a593Smuzhiyun 62*4882a593Smuzhiyun uint64_t dn_pad3[4]; 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun blkptr_t dn_blkptr[1]; 65*4882a593Smuzhiyun uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; 66*4882a593Smuzhiyun blkptr_t dn_spill; 67*4882a593Smuzhiyun } dnode_phys_t; 68*4882a593Smuzhiyun 69*4882a593Smuzhiyun #endif /* _SYS_DNODE_H */ 70