linux/fs/nilfs2/btnode.h
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   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 */
  39struct nilfs_btnode_chkey_ctxt {
  40        __u64 oldkey;
  41        __u64 newkey;
  42        struct buffer_head *bh;
  43        struct buffer_head *newbh;
  44};
  45
  46void nilfs_btnode_cache_clear(struct address_space *);
  47struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
  48                                              __u64 blocknr);
  49int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
  50                              struct buffer_head **, sector_t *);
  51void nilfs_btnode_delete(struct buffer_head *);
  52int nilfs_btnode_prepare_change_key(struct address_space *,
  53                                    struct nilfs_btnode_chkey_ctxt *);
  54void nilfs_btnode_commit_change_key(struct address_space *,
  55                                    struct nilfs_btnode_chkey_ctxt *);
  56void nilfs_btnode_abort_change_key(struct address_space *,
  57                                   struct nilfs_btnode_chkey_ctxt *);
  58
  59#endif  /* _NILFS_BTNODE_H */
  60
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