LXR linux/fs/nilfs2/btnode.h

   1/* SPDX-License-Identifier: GPL-2.0+ */
   2/*
   3 * btnode.h - NILFS B-tree node cache
   4 *
   5 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
   6 *
   7 * Written by Seiji Kihara.
   8 * Revised by Ryusuke Konishi.
   9 */
  10
  11#ifndef _NILFS_BTNODE_H
  12#define _NILFS_BTNODE_H
  13
  14#include <linux/types.h>
  15#include <linux/buffer_head.h>
  16#include <linux/fs.h>
  17#include <linux/backing-dev.h>
  18
  19/**
  20 * struct nilfs_btnode_chkey_ctxt - change key context
  21 * @oldkey: old key of block's moving content
  22 * @newkey: new key for block's content
  23 * @bh: buffer head of old buffer
  24 * @newbh: buffer head of new buffer
  25 */
  26struct nilfs_btnode_chkey_ctxt {
  27        __u64 oldkey;
  28        __u64 newkey;
  29        struct buffer_head *bh;
  30        struct buffer_head *newbh;
  31};
  32
  33void nilfs_btnode_cache_clear(struct address_space *);
  34struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
  35                                              __u64 blocknr);
  36int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t, int,
  37                              int, struct buffer_head **, sector_t *);
  38void nilfs_btnode_delete(struct buffer_head *);
  39int nilfs_btnode_prepare_change_key(struct address_space *,
  40                                    struct nilfs_btnode_chkey_ctxt *);
  41void nilfs_btnode_commit_change_key(struct address_space *,
  42                                    struct nilfs_btnode_chkey_ctxt *);
  43void nilfs_btnode_abort_change_key(struct address_space *,
  44                                   struct nilfs_btnode_chkey_ctxt *);
  45
  46#endif  /* _NILFS_BTNODE_H */
  47