/* SPDX-License-Identifier: GPL-2.0+ */

  /*
   * btnode.h - NILFS B-tree node cache
   *
   * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   *

   * Written by Seiji Kihara.
   * Revised by Ryusuke Konishi.

   */
  
  #ifndef _NILFS_BTNODE_H
  #define _NILFS_BTNODE_H
  
  #include <linux/types.h>
  #include <linux/buffer_head.h>
  #include <linux/fs.h>
  #include <linux/backing-dev.h>

  /**
   * struct nilfs_btnode_chkey_ctxt - change key context
   * @oldkey: old key of block's moving content
   * @newkey: new key for block's content
   * @bh: buffer head of old buffer
   * @newbh: buffer head of new buffer
   */

  struct nilfs_btnode_chkey_ctxt {
  	__u64 oldkey;
  	__u64 newkey;
  	struct buffer_head *bh;
  	struct buffer_head *newbh;
  };

  void nilfs_btnode_cache_clear(struct address_space *);

  struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
  					      __u64 blocknr);

  int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,

  			      int, struct buffer_head **, sector_t *);

  void nilfs_btnode_delete(struct buffer_head *);
  int nilfs_btnode_prepare_change_key(struct address_space *,
  				    struct nilfs_btnode_chkey_ctxt *);
  void nilfs_btnode_commit_change_key(struct address_space *,
  				    struct nilfs_btnode_chkey_ctxt *);
  void nilfs_btnode_abort_change_key(struct address_space *,
  				   struct nilfs_btnode_chkey_ctxt *);

  #endif	/* _NILFS_BTNODE_H */