release/src/router/busybox/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
  13 struct 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
  27 typedef struct ext2_block_relocation_table *ext2_brel;
  28
  29 struct 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
  77 errcode_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)))