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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
31struct nilfs_direct;
32
33/**
34 * struct nilfs_direct_node - direct node
35 * @dn_flags: flags
36 * @dn_pad: padding
37 */
38struct nilfs_direct_node {
39 __u8 dn_flags;
40 __u8 pad[7];
41};
42
43/**
44 * struct nilfs_direct - direct mapping
45 * @d_bmap: bmap structure
46 */
47struct nilfs_direct {
48 struct nilfs_bmap d_bmap;
49};
50
51
52#define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
53#define NILFS_DIRECT_KEY_MIN 0
54#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)
55
56
57int nilfs_direct_init(struct nilfs_bmap *);
58int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
59 __u64 *, int);
60
61
62#endif /* _NILFS_DIRECT_H */