arch/all-pc/boot/grub2-aros/include/grub/zfs/dnode.h

   1 /*
   2  *  GRUB  --  GRand Unified Bootloader
   3  *  Copyright (C) 1999,2000,2001,2002,2003,2004  Free Software Foundation, Inc.
   4  *
   5  *  GRUB 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 3 of the License, or
   8  *  (at your option) any later version.
   9  *
  10  *  GRUB 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 GRUB.  If not, see <http://www.gnu.org/licenses/>.
  17  */
  18 /*
  19  * Copyright 2010 Sun Microsystems, Inc.  All rights reserved.
  20  * Use is subject to license terms.
  21  */
  22
  23 #ifndef _SYS_DNODE_H
  24 #define _SYS_DNODE_H
  25
  26 #include <grub/zfs/spa.h>
  27
  28 /*
  29  * Fixed constants.
  30  */
  31 #define DNODE_SHIFT             9       /* 512 bytes */
  32 #define DNODE_BLOCK_SHIFT       14      /* 16k */
  33 #define DNODE_CORE_SIZE         64      /* 64 bytes for dnode sans blkptrs */
  34
  35 /*
  36  * Derived constants.
  37  */
  38 #define DNODE_SIZE      (1 << DNODE_SHIFT)
  39 #define DN_MAX_NBLKPTR  ((DNODE_SIZE - DNODE_CORE_SIZE) >> SPA_BLKPTRSHIFT)
  40 #define DN_MAX_BONUSLEN (DNODE_SIZE - DNODE_CORE_SIZE - (1 << SPA_BLKPTRSHIFT))
  41
  42 #define DNODES_PER_BLOCK_SHIFT  (DNODE_BLOCK_SHIFT - DNODE_SHIFT)
  43 #define DNODES_PER_BLOCK        (1ULL << DNODES_PER_BLOCK_SHIFT)
  44
  45 #define DNODE_FLAG_SPILL_BLKPTR (1<<2)
  46
  47 #define DN_BONUS(dnp)   ((void*)((dnp)->dn_bonus + \
  48         (((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))
  49
  50 typedef struct dnode_phys {
  51         grub_uint8_t dn_type;           /* dmu_object_type_t */
  52         grub_uint8_t dn_indblkshift;            /* ln2(indirect block size) */
  53         grub_uint8_t dn_nlevels;                /* 1=dn_blkptr->data blocks */
  54         grub_uint8_t dn_nblkptr;                /* length of dn_blkptr */
  55         grub_uint8_t dn_bonustype;              /* type of data in bonus buffer */
  56         grub_uint8_t    dn_checksum;            /* ZIO_CHECKSUM type */
  57         grub_uint8_t    dn_compress;            /* ZIO_COMPRESS type */
  58         grub_uint8_t dn_flags;          /* DNODE_FLAG_* */
  59         grub_uint16_t dn_datablkszsec;  /* data block size in 512b sectors */
  60         grub_uint16_t dn_bonuslen;              /* length of dn_bonus */
  61         grub_uint8_t dn_pad2[4];
  62
  63         /* accounting is protected by dn_dirty_mtx */
  64         grub_uint64_t dn_maxblkid;              /* largest allocated block ID */
  65         grub_uint64_t dn_used;          /* bytes (or sectors) of disk space */
  66
  67         grub_uint64_t dn_pad3[4];
  68
  69         blkptr_t dn_blkptr[1];
  70         grub_uint8_t dn_bonus[DN_MAX_BONUSLEN - sizeof (blkptr_t)];
  71         blkptr_t dn_spill;
  72 } dnode_phys_t;
  73
  74 #endif  /* _SYS_DNODE_H */