arch/all-pc/boot/grub2-aros/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  *  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 2009 Sun Microsystems, Inc.  All rights reserved.
  20  * Use is subject to license terms.
  21  */
  22
  23 #ifndef _SYS_ZAP_IMPL_H
  24 #define _SYS_ZAP_IMPL_H
  25
  26 #define ZAP_MAGIC 0x2F52AB2ABULL
  27
  28 #define ZAP_HASHBITS            28
  29 #define MZAP_ENT_LEN            64
  30 #define MZAP_NAME_LEN           (MZAP_ENT_LEN - 8 - 4 - 2)
  31
  32 typedef struct mzap_ent_phys {
  33         grub_uint64_t mze_value;
  34         grub_uint32_t mze_cd;
  35         grub_uint16_t mze_pad;  /* in case we want to chain them someday */
  36         char mze_name[MZAP_NAME_LEN];
  37 } mzap_ent_phys_t;
  38
  39 typedef struct mzap_phys {
  40         grub_uint64_t mz_block_type;    /* ZBT_MICRO */
  41         grub_uint64_t mz_salt;
  42         grub_uint64_t mz_pad[6];
  43         mzap_ent_phys_t mz_chunk[1];
  44         /* actually variable size depending on block size */
  45 } mzap_phys_t;
  46
  47 /*
  48  * The (fat) zap is stored in one object. It is an array of
  49  * 1<<FZAP_BLOCK_SHIFT byte blocks. The layout looks like one of:
  50  *
  51  * ptrtbl fits in first block:
  52  *      [zap_phys_t zap_ptrtbl_shift < 6] [zap_leaf_t] ...
  53  *
  54  * ptrtbl too big for first block:
  55  *      [zap_phys_t zap_ptrtbl_shift >= 6] [zap_leaf_t] [ptrtbl] ...
  56  *
  57  */
  58
  59 #define ZBT_LEAF                ((1ULL << 63) + 0)
  60 #define ZBT_HEADER              ((1ULL << 63) + 1)
  61 #define ZBT_MICRO               ((1ULL << 63) + 3)
  62 /* any other values are ptrtbl blocks */
  63
  64 /*
  65  * the embedded pointer table takes up half a block:
  66  * block size / entry size (2^3) / 2
  67  */
  68 #define ZAP_EMBEDDED_PTRTBL_SHIFT(zap) (FZAP_BLOCK_SHIFT(zap) - 3 - 1)
  69
  70 /*
  71  * The embedded pointer table starts half-way through the block.  Since
  72  * the pointer table itself is half the block, it starts at (64-bit)
  73  * word number (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap)).
  74  */
  75 #define ZAP_EMBEDDED_PTRTBL_ENT(zap, idx) \
  76         ((grub_uint64_t *)(zap)->zap_f.zap_phys) \
  77         [(idx) + (1<<ZAP_EMBEDDED_PTRTBL_SHIFT(zap))]
  78
  79 /*
  80  * TAKE NOTE:
  81  * If zap_phys_t is modified, zap_byteswap() must be modified.
  82  */
  83 typedef struct zap_phys {
  84         grub_uint64_t zap_block_type;   /* ZBT_HEADER */
  85         grub_uint64_t zap_magic;                /* ZAP_MAGIC */
  86
  87         struct zap_table_phys {
  88                 grub_uint64_t zt_blk;   /* starting block number */
  89                 grub_uint64_t zt_numblks;       /* number of blocks */
  90                 grub_uint64_t zt_shift; /* bits to index it */
  91                 grub_uint64_t zt_nextblk;       /* next (larger) copy start block */
  92                 grub_uint64_t zt_blks_copied; /* number source blocks copied */
  93         } zap_ptrtbl;
  94
  95         grub_uint64_t zap_freeblk;              /* the next free block */
  96         grub_uint64_t zap_num_leafs;            /* number of leafs */
  97         grub_uint64_t zap_num_entries;  /* number of entries */
  98         grub_uint64_t zap_salt;         /* salt to stir into hash function */
  99         grub_uint64_t zap_normflags;            /* flags for u8_textprep_str() */
 100         grub_uint64_t zap_flags;                /* zap_flag_t */
 101         /*
 102          * This structure is followed by padding, and then the embedded
 103          * pointer table.  The embedded pointer table takes up second
 104          * half of the block.  It is accessed using the
 105          * ZAP_EMBEDDED_PTRTBL_ENT() macro.
 106          */
 107 } zap_phys_t;
 108
 109 #endif /* _SYS_ZAP_IMPL_H */