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 * 16 * Written by Seiji Kihara. 17 * Revised by Ryusuke Konishi. 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 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 */ 35struct nilfs_btnode_chkey_ctxt { 36 __u64 oldkey; 37 __u64 newkey; 38 struct buffer_head *bh; 39 struct buffer_head *newbh; 40}; 41 42void nilfs_btnode_cache_clear(struct address_space *); 43struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc, 44 __u64 blocknr); 45int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int, 46 struct buffer_head **, sector_t *); 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 55#endif /* _NILFS_BTNODE_H */ 56