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