dskalloc.h

T-kernel 的extension源代码

/*
 *----------------------------------------------------------------------
 *    T-Kernel / Standard Extension
 *
 *    Copyright (C) 2006 by Ken Sakamura. All rights reserved.
 *    T-Kernel / Standard Extension is distributed 
 *      under the T-License for T-Kernel / Standard Extension.
 *----------------------------------------------------------------------
 *
 *    Version:   1.00.00
 *    Released by T-Engine Forum(http://www.t-engine.org) at 2006/8/11.
 *
 *----------------------------------------------------------------------
 */

/*
 *	dskalloc.h (file)
 *
 *	File management
 *	Disk allocation management
 */

#ifndef _FM_DSKALLOC_H_
#define _FM_DSKALLOC_H_

#include "fsinfo.h"


/* === Fragment table-related =========================================== */

/*
 * Elements of the fragment table.
 *	One created by modifying DfFragment for internal processing.
 */
typedef struct Fragment {
	W		size;
	DskAdr		locate;
} Fragment;

IMPORT ER	fmpAllocateFragment( DskAdr *dadr, W size, OFCB *ofcb );
IMPORT ER	fmpResizeFragment( UW lblk, W use, W size, OFCB *ofcb );
IMPORT ER	fmpMergeFragment( UW lblk, VP madr, W start, W end, OFCB *ofcb );


/* === Use block bit map-related ============================================= */

/*
 * Logical block address
 *	In order to support the contiguous blocks of 256 block or more.
 *	One created by modifying LogBlk.
 */
typedef struct {
	UW	cnt;	/* Contiguous block count */
	UW	adr;	/* Logical block address */
} LLogBlk;

IMPORT ER	fmpAllocateBlock( LLogBlk *alloc, W size, W units, UW lblk, OFCB *ofcb );
IMPORT ER	fmpAllocateOneBlock( UW lblk, OFCB *ofcb, FsInfo *fsinfo );
IMPORT ER	fmpFreeBlock( LLogBlk free, OFCB *ofcb );
IMPORT ER	fmpFreeOneBlock( UW free, OFCB *ofcb, FsInfo *fsinfo );
IMPORT ER	fmpFreeDataBlk( LogBlk lblk, W top, W end, BOOL topf, OFCB *ofcb );

#endif