usr/src/grub/grub-0.97/stage2/zfs-include/dnode.h

   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  * Copyright (c) 2014 by Delphix. All rights reserved.
  25  */
  26
  27 #ifndef _SYS_DNODE_H
  28 #define _SYS_DNODE_H
  29
  30 /*
  31  * Fixed constants.
  32  */
  33 #define DNODE_SHIFT             9       /* 512 bytes */
  34 #define DN_MIN_INDBLKSHIFT      12      /* 4k */
  35 #define DN_MAX_INDBLKSHIFT      14      /* 16k */
  36 #define DNODE_BLOCK_SHIFT       14      /* 16k */
  37 #define DNODE_CORE_SIZE         64      /* 64 bytes for dnode sans blkptrs */
  38 #define DN_MAX_OBJECT_SHIFT     48      /* 256 trillion (zfs_fid_t limit) */
  39 #define DN_MAX_OFFSET_SHIFT     64      /* 2^64 bytes in a dnode */
  40
  41 /*
  42  * Derived constants.
  43  */
  44 #define DNODE_SIZE      (1 << DNODE_SHIFT)
  45 #define DN_MAX_NBLKPTR  ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
  46 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
  47 #define DN_MAX_OBJECT   (1ULL << DN_MAX_OBJECT_SHIFT)
  48
  49 #define DNODES_PER_BLOCK_SHIFT  (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
  50 #define DNODES_PER_BLOCK        (1ULL << DNODES_PER_BLOCK_SHIFT)
  51 #define DNODES_PER_LEVEL_SHIFT  (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
  52
  53 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
  54
  55 #define DN_BONUS(dnp)   ((void*)((dnp)->dn_bonus + \
  56         (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
  57
  58 typedef struct dnode_phys {
  59         uint8_t dn_type;                /* dmu_object_type_t */
  60         uint8_t dn_indblkshift;         /* ln2(indirect block size) */
  61         uint8_t dn_nlevels;             /* 1=dn_blkptr->data blocks */
  62         uint8_t dn_nblkptr;             /* length of dn_blkptr */
  63         uint8_t dn_bonustype;           /* type of data in bonus buffer */
  64         uint8_t dn_checksum;            /* ZIO_CHECKSUM type */
  65         uint8_t dn_compress;            /* ZIO_COMPRESS type */
  66         uint8_t dn_flags;               /* DNODE_FLAG_* */
  67         uint16_t dn_datablkszsec;       /* data block size in 512b sectors */
  68         uint16_t dn_bonuslen;           /* length of dn_bonus */
  69         uint8_t dn_pad2[4];
  70
  71         /* accounting is protected by dn_dirty_mtx */
  72         uint64_t dn_maxblkid;           /* largest allocated block ID */
  73         uint64_t dn_used;               /* bytes (or sectors) of disk space */
  74
  75         uint64_t dn_pad3[4];
  76
  77         blkptr_t dn_blkptr[1];
  78         uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
  79         blkptr_t dn_spill;
  80 } dnode_phys_t;
  81
  82 #endif  /* _SYS_DNODE_H */