LXR uboot/include/zfs/dnode.h

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