forked from luck/tmp_suning_uos_patched
41c88bd74d
This cleanup patch gives several improvements:
- Moving all kmem_cache_{create_destroy} calls into one place, which removes
some small function calls, cleans up error check code and clarify the logic.
- Mark all initial code in __init section.
- Remove some very obvious comments.
- Adjust some declarations.
- Fix some space-tab issues.
Signed-off-by: Li Hong <lihong.hi@gmail.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
86 lines
2.8 KiB
C
86 lines
2.8 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 - B-tree structure
|
|
* @bt_bmap: bmap base structure
|
|
*/
|
|
struct nilfs_btree {
|
|
struct nilfs_bmap bt_bmap;
|
|
};
|
|
|
|
/**
|
|
* 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_btree *, 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_path_cache_init(void);
|
|
void nilfs_btree_path_cache_destroy(void);
|
|
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 *);
|
|
|
|
#endif /* _NILFS_BTREE_H */
|