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 * 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 Seiji Kihara <kihara@osrg.net> 21 * Revised by Ryusuke Konishi <ryusuke@osrg.net> 22 */ 23 24 #ifndef _NILFS_BTNODE_H 25 #define _NILFS_BTNODE_H 26 27 #include <linux/types.h> 28 #include <linux/buffer_head.h> 29 #include <linux/fs.h> 30 #include <linux/backing-dev.h> 31 32 /** 33 * struct nilfs_btnode_chkey_ctxt - change key context 34 * @oldkey: old key of block's moving content 35 * @newkey: new key for block's content 36 * @bh: buffer head of old buffer 37 * @newbh: buffer head of new buffer 38 */ 39 struct nilfs_btnode_chkey_ctxt { 40 __u64 oldkey; 41 __u64 newkey; 42 struct buffer_head *bh; 43 struct buffer_head *newbh; 44 }; 45 46 void nilfs_btnode_cache_clear(struct address_space *); 47 struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc, 48 __u64 blocknr); 49 int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int, 50 struct buffer_head **, sector_t *); 51 void nilfs_btnode_delete(struct buffer_head *); 52 int nilfs_btnode_prepare_change_key(struct address_space *, 53 struct nilfs_btnode_chkey_ctxt *); 54 void nilfs_btnode_commit_change_key(struct address_space *, 55 struct nilfs_btnode_chkey_ctxt *); 56 void nilfs_btnode_abort_change_key(struct address_space *, 57 struct nilfs_btnode_chkey_ctxt *); 58 59 #endif /* _NILFS_BTNODE_H */ 60