mirror of
https://github.com/torvalds/linux.git
synced 2024-12-09 04:31:39 +00:00
17c76b0104
This adds declarations and functions of NILFS2 B-tree. Two variants are integrated in the NILFS2 B-tree. The B-tree for the most files points to the child nodes or data blocks with virtual block addresses, whereas the B-tree of the DAT uses actual block addresses. Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
118 lines
3.4 KiB
C
118 lines
3.4 KiB
C
/*
|
|
* 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
* Written by Koji Sato <koji@osrg.net>.
|
|
*/
|
|
|
|
#ifndef _NILFS_BTREE_H
|
|
#define _NILFS_BTREE_H
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/list.h>
|
|
#include <linux/nilfs2_fs.h>
|
|
#include "btnode.h"
|
|
#include "bmap.h"
|
|
|
|
struct nilfs_btree;
|
|
struct nilfs_btree_path;
|
|
|
|
/**
|
|
* struct nilfs_btree_operations - B-tree operation table
|
|
*/
|
|
struct nilfs_btree_operations {
|
|
__u64 (*btop_find_target)(const struct nilfs_btree *,
|
|
const struct nilfs_btree_path *, __u64);
|
|
void (*btop_set_target)(struct nilfs_btree *, __u64, __u64);
|
|
|
|
struct the_nilfs *(*btop_get_nilfs)(struct nilfs_btree *);
|
|
|
|
int (*btop_propagate)(struct nilfs_btree *,
|
|
struct nilfs_btree_path *,
|
|
int,
|
|
struct buffer_head *);
|
|
int (*btop_assign)(struct nilfs_btree *,
|
|
struct nilfs_btree_path *,
|
|
int,
|
|
struct buffer_head **,
|
|
sector_t,
|
|
union nilfs_binfo *);
|
|
};
|
|
|
|
/**
|
|
* struct nilfs_btree_node - B-tree node
|
|
* @bn_flags: flags
|
|
* @bn_level: level
|
|
* @bn_nchildren: number of children
|
|
* @bn_pad: padding
|
|
*/
|
|
struct nilfs_btree_node {
|
|
__u8 bn_flags;
|
|
__u8 bn_level;
|
|
__le16 bn_nchildren;
|
|
__le32 bn_pad;
|
|
};
|
|
|
|
/* flags */
|
|
#define NILFS_BTREE_NODE_ROOT 0x01
|
|
|
|
/* level */
|
|
#define NILFS_BTREE_LEVEL_DATA 0
|
|
#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
|
|
#define NILFS_BTREE_LEVEL_MAX 14
|
|
|
|
/**
|
|
* struct nilfs_btree - B-tree structure
|
|
* @bt_bmap: bmap base structure
|
|
* @bt_ops: B-tree operation table
|
|
*/
|
|
struct nilfs_btree {
|
|
struct nilfs_bmap bt_bmap;
|
|
|
|
/* B-tree-specific members */
|
|
const struct nilfs_btree_operations *bt_ops;
|
|
};
|
|
|
|
|
|
#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)
|
|
|
|
|
|
int nilfs_btree_path_cache_init(void);
|
|
void nilfs_btree_path_cache_destroy(void);
|
|
int nilfs_btree_init(struct nilfs_bmap *, __u64, __u64);
|
|
int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64,
|
|
const __u64 *, const __u64 *,
|
|
int, __u64, __u64);
|
|
void nilfs_btree_init_gc(struct nilfs_bmap *);
|
|
|
|
#endif /* _NILFS_BTREE_H */
|