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Diffstat (limited to 'include/zfs/dnode.h')
| -rw-r--r-- | include/zfs/dnode.h | 81 |
1 files changed, 81 insertions, 0 deletions
diff --git a/include/zfs/dnode.h b/include/zfs/dnode.h new file mode 100644 index 000000000..09b45626b --- /dev/null +++ b/include/zfs/dnode.h @@ -0,0 +1,81 @@ +/* + * GRUB -- GRand Unified Bootloader + * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ +/* + * Copyright 2010 Sun Microsystems, Inc. All rights reserved. + * Use is subject to license terms. + */ + +#ifndef _SYS_DNODE_H +#define _SYS_DNODE_H + +#include <zfs/spa.h> + +/* + * Fixed constants. + */ +#define DNODE_SHIFT 9 /* 512 bytes */ +#define DN_MIN_INDBLKSHIFT 10 /* 1k */ +#define DN_MAX_INDBLKSHIFT 14 /* 16k */ +#define DNODE_BLOCK_SHIFT 14 /* 16k */ +#define DNODE_CORE_SIZE 64 /* 64 bytes for dnode sans blkptrs */ +#define DN_MAX_OBJECT_SHIFT 48 /* 256 trillion (zfs_fid_t limit) */ +#define DN_MAX_OFFSET_SHIFT 64 /* 2^64 bytes in a dnode */ + +/* + * Derived constants. + */ +#define DNODE_SIZE (1 << DNODE_SHIFT) +#define DN_MAX_NBLKPTR ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT) +#define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT)) +#define DN_MAX_OBJECT (1ULL << DN_MAX_OBJECT_SHIFT) + +#define DNODES_PER_BLOCK_SHIFT (DNODE_BLOCK_SHIFT - DNODE_SHIFT) +#define DNODES_PER_BLOCK (1ULL << DNODES_PER_BLOCK_SHIFT) +#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT) + +#define DNODE_FLAG_SPILL_BLKPTR (1<<2) + +#define DN_BONUS(dnp) ((void *)((dnp)->dn_bonus + \ + (((dnp)->dn_nblkptr - 1) * sizeof(blkptr_t)))) + +typedef struct dnode_phys { + uint8_t dn_type; /* dmu_object_type_t */ + uint8_t dn_indblkshift; /* ln2(indirect block size) */ + uint8_t dn_nlevels; /* 1=dn_blkptr->data blocks */ + uint8_t dn_nblkptr; /* length of dn_blkptr */ + uint8_t dn_bonustype; /* type of data in bonus buffer */ + uint8_t dn_checksum; /* ZIO_CHECKSUM type */ + uint8_t dn_compress; /* ZIO_COMPRESS type */ + uint8_t dn_flags; /* DNODE_FLAG_* */ + uint16_t dn_datablkszsec; /* data block size in 512b sectors */ + uint16_t dn_bonuslen; /* length of dn_bonus */ + uint8_t dn_pad2[4]; + + /* accounting is protected by dn_dirty_mtx */ + uint64_t dn_maxblkid; /* largest allocated block ID */ + uint64_t dn_used; /* bytes (or sectors) of disk space */ + + uint64_t dn_pad3[4]; + + blkptr_t dn_blkptr[1]; + uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof(blkptr_t)]; + blkptr_t dn_spill; +} dnode_phys_t; + +#endif /* _SYS_DNODE_H */ |