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Koji Sato17c76b02009-04-06 19:01:24 -07001/*
2 * btree.h - NILFS B-tree.
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 Koji Sato <koji@osrg.net>.
21 */
22
23#ifndef _NILFS_BTREE_H
24#define _NILFS_BTREE_H
25
26#include <linux/types.h>
27#include <linux/buffer_head.h>
28#include <linux/list.h>
29#include <linux/nilfs2_fs.h>
30#include "btnode.h"
31#include "bmap.h"
32
Koji Sato17c76b02009-04-06 19:01:24 -070033/**
Li Hong41c88bd2010-04-06 00:54:11 +080034 * struct nilfs_btree_path - A path on which B-tree operations are executed
35 * @bp_bh: buffer head of node block
36 * @bp_sib_bh: buffer head of sibling node block
37 * @bp_index: index of child node
38 * @bp_oldreq: ptr end request for old ptr
39 * @bp_newreq: ptr alloc request for new ptr
40 * @bp_op: rebalance operation
41 */
42struct nilfs_btree_path {
43 struct buffer_head *bp_bh;
44 struct buffer_head *bp_sib_bh;
45 int bp_index;
46 union nilfs_bmap_ptr_req bp_oldreq;
47 union nilfs_bmap_ptr_req bp_newreq;
48 struct nilfs_btnode_chkey_ctxt bp_ctxt;
Ryusuke Konishie7c274f2010-07-10 19:09:49 +090049 void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *,
Li Hong41c88bd2010-04-06 00:54:11 +080050 int, __u64 *, __u64 *);
51};
Koji Sato17c76b02009-04-06 19:01:24 -070052
53#define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE
54#define NILFS_BTREE_ROOT_NCHILDREN_MAX \
55 ((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \
56 (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
57#define NILFS_BTREE_ROOT_NCHILDREN_MIN 0
58#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE (sizeof(__le64))
59#define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \
60 (((nodesize) - sizeof(struct nilfs_btree_node) - \
61 NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \
62 (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))
63#define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \
64 ((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1)
65#define NILFS_BTREE_KEY_MIN ((__u64)0)
66#define NILFS_BTREE_KEY_MAX (~(__u64)0)
67
Li Hong41c88bd2010-04-06 00:54:11 +080068extern struct kmem_cache *nilfs_btree_path_cache;
Koji Sato17c76b02009-04-06 19:01:24 -070069
Ryusuke Konishi30333422009-05-24 00:09:44 +090070int nilfs_btree_init(struct nilfs_bmap *);
Koji Sato17c76b02009-04-06 19:01:24 -070071int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
Ryusuke Konishi30333422009-05-24 00:09:44 +090072 const __u64 *, const __u64 *, int);
Koji Sato17c76b02009-04-06 19:01:24 -070073void nilfs_btree_init_gc(struct nilfs_bmap *);
74
Ryusuke Konishi1d5385b2010-07-16 23:52:40 +090075int nilfs_btree_broken_node_block(struct buffer_head *bh);
76
Koji Sato17c76b02009-04-06 19:01:24 -070077#endif /* _NILFS_BTREE_H */