original development tree for Linux kernel GTP module; now long in mainline.
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/*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Written by Seiji Kihara <kihara@osrg.net>
* Revised by Ryusuke Konishi <ryusuke@osrg.net>
*/
#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,
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 */