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1/*
2 * btnode.h - NILFS B-tree node cache
3 *
4 * Copyright (C) 2005-2008 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 *
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16 * Written by Seiji Kihara.
17 * Revised by Ryusuke Konishi.
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18 */
19
20#ifndef _NILFS_BTNODE_H
21#define _NILFS_BTNODE_H
22
23#include <linux/types.h>
24#include <linux/buffer_head.h>
25#include <linux/fs.h>
26#include <linux/backing-dev.h>
27
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28/**
29 * struct nilfs_btnode_chkey_ctxt - change key context
30 * @oldkey: old key of block's moving content
31 * @newkey: new key for block's content
32 * @bh: buffer head of old buffer
33 * @newbh: buffer head of new buffer
34 */
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35struct nilfs_btnode_chkey_ctxt {
36 __u64 oldkey;
37 __u64 newkey;
38 struct buffer_head *bh;
39 struct buffer_head *newbh;
40};
41
a60be987 42void nilfs_btnode_cache_clear(struct address_space *);
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43struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
44 __u64 blocknr);
26dfdd8e 45int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
2a222ca9 46 int, struct buffer_head **, sector_t *);
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47void nilfs_btnode_delete(struct buffer_head *);
48int nilfs_btnode_prepare_change_key(struct address_space *,
49 struct nilfs_btnode_chkey_ctxt *);
50void nilfs_btnode_commit_change_key(struct address_space *,
51 struct nilfs_btnode_chkey_ctxt *);
52void nilfs_btnode_abort_change_key(struct address_space *,
53 struct nilfs_btnode_chkey_ctxt *);
54
a60be987 55#endif /* _NILFS_BTNODE_H */