fs/nilfs2/btnode.h

   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 */