nilfs2: insert explanations in gcinode file
[linux-2.6-block.git] / fs / nilfs2 / sufile.h
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1/*
2 * sufile.h - NILFS segment usage file.
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_SUFILE_H
24#define _NILFS_SUFILE_H
25
26#include <linux/fs.h>
27#include <linux/buffer_head.h>
28#include <linux/nilfs2_fs.h>
29#include "mdt.h"
30
31#define NILFS_SUFILE_GFP NILFS_MDT_GFP
32
33static inline unsigned long nilfs_sufile_get_nsegments(struct inode *sufile)
34{
35 return NILFS_MDT(sufile)->mi_nilfs->ns_nsegments;
36}
37
38int nilfs_sufile_alloc(struct inode *, __u64 *);
39int nilfs_sufile_cancel_free(struct inode *, __u64);
40int nilfs_sufile_freev(struct inode *, __u64 *, size_t);
41int nilfs_sufile_free(struct inode *, __u64);
42int nilfs_sufile_get_segment_usage(struct inode *, __u64,
43 struct nilfs_segment_usage **,
44 struct buffer_head **);
45void nilfs_sufile_put_segment_usage(struct inode *, __u64,
46 struct buffer_head *);
47int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
48int nilfs_sufile_get_ncleansegs(struct inode *, unsigned long *);
49int nilfs_sufile_set_error(struct inode *, __u64);
50ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, struct nilfs_suinfo *,
51 size_t);
52
53
54#endif /* _NILFS_SUFILE_H */