Release 4.18 fs/nilfs2/btree.h

/*
 * btree.h - NILFS B-tree.
 *
 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * Written by Koji Sato.
 */

#ifndef _NILFS_BTREE_H

#define _NILFS_BTREE_H

#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/list.h>
#include <linux/nilfs2_ondisk.h>	/* nilfs_btree_node */
#include "btnode.h"
#include "bmap.h"

/**
 * struct nilfs_btree_path - A path on which B-tree operations are executed
 * @bp_bh: buffer head of node block
 * @bp_sib_bh: buffer head of sibling node block
 * @bp_index: index of child node
 * @bp_oldreq: ptr end request for old ptr
 * @bp_newreq: ptr alloc request for new ptr
 * @bp_op: rebalance operation
 */

struct nilfs_btree_path {
	
struct buffer_head *bp_bh;
	
struct buffer_head *bp_sib_bh;
	
int bp_index;
	
union nilfs_bmap_ptr_req bp_oldreq;
	
union nilfs_bmap_ptr_req bp_newreq;
	
struct nilfs_btnode_chkey_ctxt bp_ctxt;
	
void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *,
		      int, __u64 *, __u64 *);
};


#define NILFS_BTREE_ROOT_SIZE		NILFS_BMAP_SIZE

#define NILFS_BTREE_ROOT_NCHILDREN_MAX					\
	((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) /    \
         (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))

#define NILFS_BTREE_ROOT_NCHILDREN_MIN	0

#define NILFS_BTREE_NODE_EXTRA_PAD_SIZE	(sizeof(__le64))

#define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize)			\
	(((nodesize) - sizeof(struct nilfs_btree_node) -                \
                NILFS_BTREE_NODE_EXTRA_PAD_SIZE) /                      \
         (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */)))

#define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize)			\
	((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1)

#define NILFS_BTREE_KEY_MIN	((__u64)0)

#define NILFS_BTREE_KEY_MAX	(~(__u64)0)

extern struct kmem_cache *nilfs_btree_path_cache;

int nilfs_btree_init(struct nilfs_bmap *);
int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
				   const __u64 *, const __u64 *, int);
void nilfs_btree_init_gc(struct nilfs_bmap *);

int nilfs_btree_broken_node_block(struct buffer_head *bh);

#endif	/* _NILFS_BTREE_H */
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Koji Sato
113
61.08%
1
16.67%
Li Hong
59
31.89%
1
16.67%
Ryusuke Konishi
13
7.03%
4
66.67%
Total
185
100.00%
6
100.00%
Directory: fs/nilfs2

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