LXR busybox/e2fsprogs/old_e2fsprogs/ext2fs/brel.h

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * brel.h
   4 *
   5 * Copyright (C) 1996, 1997 Theodore Ts'o.
   6 *
   7 * %Begin-Header%
   8 * This file may be redistributed under the terms of the GNU Public
   9 * License.
  10 * %End-Header%
  11 */
  12
  13struct ext2_block_relocate_entry {
  14        blk_t   new;
  15        __s16   offset;
  16        __u16   flags;
  17        union {
  18                blk_t           block_ref;
  19                ext2_ino_t      inode_ref;
  20        } owner;
  21};
  22
  23#define RELOCATE_TYPE_REF  0x0007
  24#define RELOCATE_BLOCK_REF 0x0001
  25#define RELOCATE_INODE_REF 0x0002
  26
  27typedef struct ext2_block_relocation_table *ext2_brel;
  28
  29struct ext2_block_relocation_table {
  30        __u32   magic;
  31        char    *name;
  32        blk_t   current;
  33        void    *priv_data;
  34
  35        /*
  36         * Add a block relocation entry.
  37         */
  38        errcode_t (*put)(ext2_brel brel, blk_t old,
  39                              struct ext2_block_relocate_entry *ent);
  40
  41        /*
  42         * Get a block relocation entry.
  43         */
  44        errcode_t (*get)(ext2_brel brel, blk_t old,
  45                              struct ext2_block_relocate_entry *ent);
  46
  47        /*
  48         * Initialize for iterating over the block relocation entries.
  49         */
  50        errcode_t (*start_iter)(ext2_brel brel);
  51
  52        /*
  53         * The iterator function for the inode relocation entries.
  54         * Returns an inode number of 0 when out of entries.
  55         */
  56        errcode_t (*next)(ext2_brel brel, blk_t *old,
  57                          struct ext2_block_relocate_entry *ent);
  58
  59        /*
  60         * Move the inode relocation table from one block number to
  61         * another.
  62         */
  63        errcode_t (*move)(ext2_brel brel, blk_t old, blk_t new);
  64
  65        /*
  66         * Remove a block relocation entry.
  67         */
  68        errcode_t (*delete)(ext2_brel brel, blk_t old);
  69
  70
  71        /*
  72         * Free the block relocation table.
  73         */
  74        errcode_t (*free)(ext2_brel brel);
  75};
  76
  77errcode_t ext2fs_brel_memarray_create(char *name, blk_t max_block,
  78                                    ext2_brel *brel);
  79
  80#define ext2fs_brel_put(brel, old, ent) ((brel)->put((brel), old, ent))
  81#define ext2fs_brel_get(brel, old, ent) ((brel)->get((brel), old, ent))
  82#define ext2fs_brel_start_iter(brel) ((brel)->start_iter((brel)))
  83#define ext2fs_brel_next(brel, old, ent) ((brel)->next((brel), old, ent))
  84#define ext2fs_brel_move(brel, old, new) ((brel)->move((brel), old, new))
  85#define ext2fs_brel_delete(brel, old) ((brel)->delete((brel), old))
  86#define ext2fs_brel_free(brel) ((brel)->free((brel)))
  87
  88