[mirror_ubuntu-zesty-kernel.git] / fs / nilfs2 / btnode.h

/*
 * btnode.h - NILFS B-tree node cache
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by Seiji Kihara.
 * Revised by Ryusuke Konishi.
 */

#ifndef _NILFS_BTNODE_H
#define _NILFS_BTNODE_H

#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/fs.h>
#include <linux/backing-dev.h>

/**
 * struct nilfs_btnode_chkey_ctxt - change key context
 * @oldkey: old key of block's moving content
 * @newkey: new key for block's content
 * @bh: buffer head of old buffer
 * @newbh: buffer head of new buffer
 */
struct nilfs_btnode_chkey_ctxt {
	__u64 oldkey;
	__u64 newkey;
	struct buffer_head *bh;
	struct buffer_head *newbh;
};

void nilfs_btnode_cache_clear(struct address_space *);
struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
					      __u64 blocknr);
int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
			      int, struct buffer_head **, sector_t *);
void nilfs_btnode_delete(struct buffer_head *);
int nilfs_btnode_prepare_change_key(struct address_space *,
				    struct nilfs_btnode_chkey_ctxt *);
void nilfs_btnode_commit_change_key(struct address_space *,
				    struct nilfs_btnode_chkey_ctxt *);
void nilfs_btnode_abort_change_key(struct address_space *,
				   struct nilfs_btnode_chkey_ctxt *);

#endif	/* _NILFS_BTNODE_H */
Commit	Line	Data
a60be987 RK	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	*
4b420ab4 RK	16	* Written by Seiji Kihara.
4b420ab4 RK	17	* Revised by Ryusuke Konishi.
a60be987 RK	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
f5974c8f VD	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	*/
a60be987 RK	35	struct nilfs_btnode_chkey_ctxt {
	36	__u64 oldkey;
	37	__u64 newkey;
	38	struct buffer_head *bh;
	39	struct buffer_head *newbh;
	40	};
	41
a60be987	42	void nilfs_btnode_cache_clear(struct address_space *);
d501d736 RK	43	struct buffer_head nilfs_btnode_create_block(struct address_space btnc,
d501d736 RK	44	__u64 blocknr);
26dfdd8e	45	int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
2a222ca9	46	int, struct buffer_head *, sector_t );
a60be987 RK	47	void nilfs_btnode_delete(struct buffer_head *);
	48	int nilfs_btnode_prepare_change_key(struct address_space *,
	49	struct nilfs_btnode_chkey_ctxt *);
	50	void nilfs_btnode_commit_change_key(struct address_space *,
	51	struct nilfs_btnode_chkey_ctxt *);
	52	void nilfs_btnode_abort_change_key(struct address_space *,
	53	struct nilfs_btnode_chkey_ctxt *);
	54
a60be987	55	#endif /* _NILFS_BTNODE_H */