lib/ext2fs/brel.h

   1 /*
   2  * brel.h
   3  *
   4  * Copyright (C) 1996, 1997 Theodore Ts'o.
   5  *
   6  * %Begin-Header%
   7  * This file may be redistributed under the terms of the GNU Library
   8  * General Public License, version 2.
   9  * %End-Header%
  10  */
  11
  12 struct ext2_block_relocate_entry {
  13         blk64_t new;
  14         __s16   offset;
  15         __u16   flags;
  16         union {
  17                 blk64_t         block_ref;
  18                 ext2_ino_t      inode_ref;
  19         } owner;
  20 };
  21
  22 #define RELOCATE_TYPE_REF  0x0007
  23 #define RELOCATE_BLOCK_REF 0x0001
  24 #define RELOCATE_INODE_REF 0x0002
  25
  26 typedef struct ext2_block_relocation_table *ext2_brel;
  27
  28 struct ext2_block_relocation_table {
  29         __u32   magic;
  30         char    *name;
  31         blk64_t current;
  32         void    *priv_data;
  33
  34         /*
  35          * Add a block relocation entry.
  36          */
  37         errcode_t (*put)(ext2_brel brel, blk64_t old,
  38                               struct ext2_block_relocate_entry *ent);
  39
  40         /*
  41          * Get a block relocation entry.
  42          */
  43         errcode_t (*get)(ext2_brel brel, blk64_t old,
  44                               struct ext2_block_relocate_entry *ent);
  45
  46         /*
  47          * Initialize for iterating over the block relocation entries.
  48          */
  49         errcode_t (*start_iter)(ext2_brel brel);
  50
  51         /*
  52          * The iterator function for the inode relocation entries.
  53          * Returns an inode number of 0 when out of entries.
  54          */
  55         errcode_t (*next)(ext2_brel brel, blk64_t *old,
  56                           struct ext2_block_relocate_entry *ent);
  57
  58         /*
  59          * Move the inode relocation table from one block number to
  60          * another.
  61          */
  62         errcode_t (*move)(ext2_brel brel, blk64_t old, blk_t new);
  63
  64         /*
  65          * Remove a block relocation entry.
  66          */
  67         errcode_t (*delete)(ext2_brel brel, blk64_t old);
  68
  69
  70         /*
  71          * Free the block relocation table.
  72          */
  73         errcode_t (*free)(ext2_brel brel);
  74 };
  75
  76 errcode_t ext2fs_brel_memarray_create(char *name, blk64_t max_block,
  77                                     ext2_brel *brel);
  78
  79 #define ext2fs_brel_put(brel, old, ent) ((brel)->put((brel), old, ent))
  80 #define ext2fs_brel_get(brel, old, ent) ((brel)->get((brel), old, ent))
  81 #define ext2fs_brel_start_iter(brel) ((brel)->start_iter((brel)))
  82 #define ext2fs_brel_next(brel, old, ent) ((brel)->next((brel), old, ent))
  83 #define ext2fs_brel_move(brel, old, new) ((brel)->move((brel), old, new))
  84 #define ext2fs_brel_delete(brel, old) ((brel)->delete((brel), old))
  85 #define ext2fs_brel_free(brel) ((brel)->free((brel)))
  86