ofcb.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.
 *
 *----------------------------------------------------------------------
 */

/*
 *	ofcb.h (file)
 *
 *	File management
 *	Open file control block
 */

#ifndef _FM_OFCB_H_
#define _FM_OFCB_H_

/*
 * Open file control block
 */
typedef struct OFCB {
	QUEUE		q;		/* For OFCB connection */
	struct FsInfo	*fsinfo;	/* Belonging file system */

	/* Open file information */
	W		ref;		/* Reference count of this file */
	FID		fid;		/* File ID */
	struct omode {			/* Open mode (Mode-specific counter) */
		UH	excl;		/* The number of exclusive opens  */
		UH	wexcl;		/* The number of exclusive write opens */
		UH	read;		/* The number of read opens */
		UH	write;		/* The number of write opens */
	} omode;

	/* Disk information */
	ER		dskErr;		/* For recording of asynchronous errors */

	/* File header information */
	DskAdr		fhead;		/* Location of the file header */
	H		idxlv;		/* Index level */
	UH		ridxofs;	/* Location of the record index */
	W		nrec;		/* Total record count */

	/* Record information */
	QUEUE		rcb;		/* For connection of record control block (RCB) */
} OFCB;


/*
 * File open parameter
 */
typedef struct OpenPara {
	FID			fid;	/* File ID */
					/* Information of file header block */
	DfFileHeaderBlock	*fhd;	/* Mapped address */
	DskAdr			dadr;	/* Location on the disk */
} OpenPara;


IMPORT OFCB*	fmpGetOFCB( OpenPara *opara, struct FsInfo *fsinfo, ER *err );
IMPORT void	fmpRemoveOFCB( OFCB *ofcb, BOOL force );
IMPORT ER	fmpDeleteAllOFCB( struct FsInfo *fsinfo );
IMPORT ER	fmpCheckExclusiveOpen( OFCB *ofcb, UW omode );
IMPORT ER	fmpOpenOFCB( OFCB *ofcb, UW omode );
IMPORT void	fmpCloseOFCB( OFCB *ofcb, UW omode );

#endif