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  * 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  */
  35 struct nilfs_btnode_chkey_ctxt {
  36         __u64 oldkey;
  37         __u64 newkey;
  38         struct buffer_head *bh;
  39         struct buffer_head *newbh;
  40 };
  41
  42 void nilfs_btnode_cache_clear(struct address_space *);
  43 struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
  44                                               __u64 blocknr);
  45 int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
  46                               int, struct buffer_head **, sector_t *);
  47 void nilfs_btnode_delete(struct buffer_head *);
  48 int nilfs_btnode_prepare_change_key(struct address_space *,
  49                                     struct nilfs_btnode_chkey_ctxt *);
  50 void nilfs_btnode_commit_change_key(struct address_space *,
  51                                     struct nilfs_btnode_chkey_ctxt *);
  52 void nilfs_btnode_abort_change_key(struct address_space *,
  53                                    struct nilfs_btnode_chkey_ctxt *);
  54
  55 #endif  /* _NILFS_BTNODE_H */