LXR uboot/include/zfs/dnode.h

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