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1 | /* |
2 | * direct.h - NILFS direct block pointer. | |
3 | * | |
4 | * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation. | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or modify | |
7 | * it under the terms of the GNU General Public License as published by | |
8 | * the Free Software Foundation; either version 2 of the License, or | |
9 | * (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write to the Free Software | |
18 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
19 | * | |
20 | * Written by Koji Sato <koji@osrg.net>. | |
21 | */ | |
22 | ||
23 | #ifndef _NILFS_DIRECT_H | |
24 | #define _NILFS_DIRECT_H | |
25 | ||
26 | #include <linux/types.h> | |
27 | #include <linux/buffer_head.h> | |
28 | #include "bmap.h" | |
29 | ||
30 | ||
31 | struct nilfs_direct; | |
32 | ||
33 | /** | |
34 | * struct nilfs_direct_operations - direct mapping operation table | |
35 | */ | |
36 | struct nilfs_direct_operations { | |
37 | __u64 (*dop_find_target)(const struct nilfs_direct *, __u64); | |
38 | void (*dop_set_target)(struct nilfs_direct *, __u64, __u64); | |
39 | int (*dop_propagate)(struct nilfs_direct *, struct buffer_head *); | |
40 | int (*dop_assign)(struct nilfs_direct *, __u64, __u64, | |
41 | struct buffer_head **, sector_t, | |
42 | union nilfs_binfo *); | |
43 | }; | |
44 | ||
45 | /** | |
46 | * struct nilfs_direct_node - direct node | |
47 | * @dn_flags: flags | |
48 | * @dn_pad: padding | |
49 | */ | |
50 | struct nilfs_direct_node { | |
51 | __u8 dn_flags; | |
52 | __u8 pad[7]; | |
53 | }; | |
54 | ||
55 | /** | |
56 | * struct nilfs_direct - direct mapping | |
57 | * @d_bmap: bmap structure | |
58 | * @d_ops: direct mapping operation table | |
59 | */ | |
60 | struct nilfs_direct { | |
61 | struct nilfs_bmap d_bmap; | |
62 | ||
63 | /* direct-mapping-specific members */ | |
64 | const struct nilfs_direct_operations *d_ops; | |
65 | }; | |
66 | ||
67 | ||
68 | #define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1) | |
69 | #define NILFS_DIRECT_KEY_MIN 0 | |
70 | #define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1) | |
71 | ||
72 | ||
73 | int nilfs_direct_init(struct nilfs_bmap *, __u64, __u64); | |
74 | int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *, | |
75 | __u64 *, int, __u64, __u64); | |
76 | ||
77 | ||
78 | #endif /* _NILFS_DIRECT_H */ |