1*83d290c5STom Rini /* SPDX-License-Identifier: GPL-2.0+ */ 24d3c95f5SJorgen Lundman /* 34d3c95f5SJorgen Lundman * GRUB -- GRand Unified Bootloader 44d3c95f5SJorgen Lundman * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. 54d3c95f5SJorgen Lundman */ 64d3c95f5SJorgen Lundman /* 74d3c95f5SJorgen Lundman * Copyright 2010 Sun Microsystems, Inc. All rights reserved. 84d3c95f5SJorgen Lundman * Use is subject to license terms. 94d3c95f5SJorgen Lundman */ 104d3c95f5SJorgen Lundman 114d3c95f5SJorgen Lundman #ifndef _SYS_DNODE_H 124d3c95f5SJorgen Lundman #define _SYS_DNODE_H 134d3c95f5SJorgen Lundman 144d3c95f5SJorgen Lundman #include <zfs/spa.h> 154d3c95f5SJorgen Lundman 164d3c95f5SJorgen Lundman /* 174d3c95f5SJorgen Lundman * Fixed constants. 184d3c95f5SJorgen Lundman */ 194d3c95f5SJorgen Lundman #define DNODE_SHIFT 9 /* 512 bytes */ 204d3c95f5SJorgen Lundman #define DN_MIN_INDBLKSHIFT 10 /* 1k */ 214d3c95f5SJorgen Lundman #define DN_MAX_INDBLKSHIFT 14 /* 16k */ 224d3c95f5SJorgen Lundman #define DNODE_BLOCK_SHIFT 14 /* 16k */ 234d3c95f5SJorgen Lundman #define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ 244d3c95f5SJorgen Lundman #define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ 254d3c95f5SJorgen Lundman #define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ 264d3c95f5SJorgen Lundman 274d3c95f5SJorgen Lundman /* 284d3c95f5SJorgen Lundman * Derived constants. 294d3c95f5SJorgen Lundman */ 304d3c95f5SJorgen Lundman #define DNODE_SIZE (1 << DNODE_SHIFT) 314d3c95f5SJorgen Lundman #define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) 324d3c95f5SJorgen Lundman #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) 334d3c95f5SJorgen Lundman #define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) 344d3c95f5SJorgen Lundman 354d3c95f5SJorgen Lundman #define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) 364d3c95f5SJorgen Lundman #define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) 374d3c95f5SJorgen Lundman #define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) 384d3c95f5SJorgen Lundman 394d3c95f5SJorgen Lundman #define DNODE_FLAG_SPILL_BLKPTR (1<<2) 404d3c95f5SJorgen Lundman 414d3c95f5SJorgen Lundman #define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ 424d3c95f5SJorgen Lundman (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) 434d3c95f5SJorgen Lundman 444d3c95f5SJorgen Lundman typedef struct dnode_phys { 454d3c95f5SJorgen Lundman uint8_t dn_type; /* dmu_object_type_t */ 464d3c95f5SJorgen Lundman uint8_t dn_indblkshift; /* ln2(indirect block size) */ 474d3c95f5SJorgen Lundman uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ 484d3c95f5SJorgen Lundman uint8_t dn_nblkptr; /* length of dn_blkptr */ 494d3c95f5SJorgen Lundman uint8_t dn_bonustype; /* type of data in bonus buffer */ 504d3c95f5SJorgen Lundman uint8_t dn_checksum; /* ZIO_CHECKSUM type */ 514d3c95f5SJorgen Lundman uint8_t dn_compress; /* ZIO_COMPRESS type */ 524d3c95f5SJorgen Lundman uint8_t dn_flags; /* DNODE_FLAG_* */ 534d3c95f5SJorgen Lundman uint16_t dn_datablkszsec; /* data block size in 512b sectors */ 544d3c95f5SJorgen Lundman uint16_t dn_bonuslen; /* length of dn_bonus */ 554d3c95f5SJorgen Lundman uint8_t dn_pad2[4]; 564d3c95f5SJorgen Lundman 574d3c95f5SJorgen Lundman /* accounting is protected by dn_dirty_mtx */ 584d3c95f5SJorgen Lundman uint64_t dn_maxblkid; /* largest allocated block ID */ 594d3c95f5SJorgen Lundman uint64_t dn_used; /* bytes (or sectors) of disk space */ 604d3c95f5SJorgen Lundman 614d3c95f5SJorgen Lundman uint64_t dn_pad3[4]; 624d3c95f5SJorgen Lundman 634d3c95f5SJorgen Lundman blkptr_t dn_blkptr[1]; 644d3c95f5SJorgen Lundman uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; 654d3c95f5SJorgen Lundman blkptr_t dn_spill; 664d3c95f5SJorgen Lundman } dnode_phys_t; 674d3c95f5SJorgen Lundman 684d3c95f5SJorgen Lundman #endif /* _SYS_DNODE_H */ 69