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 
87