1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * 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  */
26 struct nilfs_btnode_chkey_ctxt {
27 	__u64 oldkey;
28 	__u64 newkey;
29 	struct buffer_head *bh;
30 	struct buffer_head *newbh;
31 };
32 
33 void nilfs_init_btnc_inode(struct inode *btnc_inode);
34 void nilfs_btnode_cache_clear(struct address_space *);
35 struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
36 					      __u64 blocknr);
37 int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t,
38 			      blk_opf_t, struct buffer_head **, sector_t *);
39 void nilfs_btnode_delete(struct buffer_head *);
40 int nilfs_btnode_prepare_change_key(struct address_space *,
41 				    struct nilfs_btnode_chkey_ctxt *);
42 void nilfs_btnode_commit_change_key(struct address_space *,
43 				    struct nilfs_btnode_chkey_ctxt *);
44 void nilfs_btnode_abort_change_key(struct address_space *,
45 				   struct nilfs_btnode_chkey_ctxt *);
46 
47 #endif	/* _NILFS_BTNODE_H */
48