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      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 Public
      8  * License.
      9  * %End-Header%
     10  */
     11 
     12 struct ext2_block_relocate_entry {
     13 	blk_t	new;
     14 	__s16	offset;
     15 	__u16	flags;
     16 	union {
     17 		blk_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 	blk_t	current;
     32 	void	*priv_data;
     33 
     34 	/*
     35 	 * Add a block relocation entry.
     36 	 */
     37 	errcode_t (*put)(ext2_brel brel, blk_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, blk_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, blk_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, blk_t old, blk_t new);
     63 
     64 	/*
     65 	 * Remove a block relocation entry.
     66 	 */
     67 	errcode_t (*delete)(ext2_brel brel, blk_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, blk_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 
     87