debian/grub-extras/disabled/zfs/include/grub/zfs/zap_impl.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 2009 Sun Microsystems, Inc.  All rights reserved.
  21  * Use is subject to license terms.
  22  */
  23
  24 #ifndef _SYS_ZAP_IMPL_H
  25 #define _SYS_ZAP_IMPL_H
  26
  27 #define ZAP_MAGIC 0x2F52AB2ABULL
  28
  29 #define ZAP_HASHBITS            28
  30 #define MZAP_ENT_LEN            64
  31 #define MZAP_NAME_LEN           (MZAP_ENT_LEN - 8 - 4 - 2)
  32 #define MZAP_MAX_BLKSHIFT       SPA_MAXBLOCKSHIFT
  33 #define MZAP_MAX_BLKSZ          (1 << MZAP_MAX_BLKSHIFT)
  34
  35 typedef struct mzap_ent_phys {
  36         grub_uint64_t mze_value;
  37         grub_uint32_t mze_cd;
  38         grub_uint16_t mze_pad;  /* in case we want to chain them someday */
  39         char mze_name[MZAP_NAME_LEN];
  40 } mzap_ent_phys_t;
  41
  42 typedef struct mzap_phys {
  43         grub_uint64_t mz_block_type;    /* ZBT_MICRO */
  44         grub_uint64_t mz_salt;
  45         grub_uint64_t mz_pad[6];
  46         mzap_ent_phys_t mz_chunk[1];
  47         /* actually variable size depending on block size */
  48 } mzap_phys_t;
  49
  50 /*
  51  * The (fat) zap is stored in one object. It is an array of
  52  * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
  53  *
  54  * ptrtbl fits in first block:
  55  *      [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
  56  *
  57  * ptrtbl too big for first block:
  58  *      [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
  59  *
  60  */
  61
  62 #define ZBT_LEAF                ((1ULL << 63) + 0)
  63 #define ZBT_HEADER              ((1ULL << 63) + 1)
  64 #define ZBT_MICRO               ((1ULL << 63) + 3)
  65 /* any other values are ptrtbl blocks */
  66
  67 /*
  68  * the embedded pointer table takes up half a block:
  69  * block size / entry size (2^3) / 2
  70  */
  71 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
  72
  73 /*
  74  * The embedded pointer table starts half-way through the block.  Since
  75  * the pointer table itself is half the block, it starts at (64-bit)
  76  * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
  77  */
  78 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
  79         ((grub_uint64_t *)(zap)->zap_f.zap_phys) \
  80         [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
  81
  82 /*
  83  * TAKE NOTE:
  84  * If zap_phys_t is modified, zap_byteswap() must be modified.
  85  */
  86 typedef struct zap_phys {
  87         grub_uint64_t zap_block_type;   /* ZBT_HEADER */
  88         grub_uint64_t zap_magic;                /* ZAP_MAGIC */
  89
  90         struct zap_table_phys {
  91                 grub_uint64_t zt_blk;   /* starting block number */
  92                 grub_uint64_t zt_numblks;       /* number of blocks */
  93                 grub_uint64_t zt_shift; /* bits to index it */
  94                 grub_uint64_t zt_nextblk;       /* next (larger) copy start block */
  95                 grub_uint64_t zt_blks_copied; /* number source blocks copied */
  96         } zap_ptrtbl;
  97
  98         grub_uint64_t zap_freeblk;              /* the next free block */
  99         grub_uint64_t zap_num_leafs;            /* number of leafs */
 100         grub_uint64_t zap_num_entries;  /* number of entries */
 101         grub_uint64_t zap_salt;         /* salt to stir into hash function */
 102         grub_uint64_t zap_normflags;            /* flags for u8_textprep_str() */
 103         grub_uint64_t zap_flags;                /* zap_flag_t */
 104         /*
 105          * This structure is followed by padding, and then the embedded
 106          * pointer table.  The embedded pointer table takes up second
 107          * half of the block.  It is accessed using the
 108          * ZAP_EMBEDDED_PTRTBL_ENT() macro.
 109          */
 110 } zap_phys_t;
 111
 112 #endif /* _SYS_ZAP_IMPL_H */