fileio.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.
 *
 *----------------------------------------------------------------------
 */

/*
 *	@(#)fileio.h (seio)
 *
 *	Standard input-output
 *	File input-output relation
 */

#include <extension/file.h>
#include <extension/sys/segment.h>
#include <device/disk.h>

#include <seio/fcntl.h>
#include <stdio.h>
#include <seio/unistd.h>
#include <seio/sys/dirent.h>
#include <seio/sys/types.h>
#include <seio/sys/stat.h>

typedef struct FileSystem	FS;
typedef struct FileDescriptor	FD;
typedef struct FileDescPacket	FDPkt;
typedef struct FileIndexNode	INODE;

/*
 * Connection queue of file reference node
 */
#define QUEMSK		0x0007
#define NQUE		((QUEMSK) + 1)

/* --------------------------------------------------------------------------- */

/*
 * Current directory information
 */
typedef struct {
	FS	*fs;		/* File system	*/
	INODE	*inode;		/* Directory		*/
} CDINF;

/*
 * Path name analysis parameter
 */
typedef struct {
	FS	*fs;		/* File system	*/
	char	*path;		/* Of the path name top location */
	INODE	*inode;		/* File information		*/
	UB	flag;		/* Analysis result flag	*/
} LPINF;

/* Analysis result flag */
#define LOOKUP_ROOT	0x01U	/* Re-analysis ( Root directory )	*/
#define LOOKUP_LINK	0x02U	/* Re-analysis ( Simbolic link )	*/
#define LOOKUP_DONE	0x04U	/* The analysis end	*/

/* --------------------------------------------------------------------------- */

/*
 * File system connection information
 */
struct FileSystem {
	QUEUE		q;			/* For queue connection		*/
	W		devnum;			/* Device number		*/
	TC		devnm[L_DEVNM];		/* Device name		*/
	char		connm[L_FCONNM];	/* Connection name		*/
	int		mode;			/* Connection mode		*/
	ino_t		rootino;		/* Root file number	*/

	QUEUE		iqtbl[NQUE];		/* INODE Connection queue	*/

	FastLock	lock;			/* Lock for exclusive control		*/
	ID		tskid;			/* File system task	*/
	ID		porid;			/* Rendezvous port for command communication	*/

	DiskInfo	diskinfo;		/* Disk information			*/
	ID		diskid;			/* Disk ID			*/
	ER		diskerr;		/* Common part disk I/O error	*/
	BOOL		rdonly;			/* True True when connecting reading only	*/

	/* Access function */
	ER	(*u_detach)	( FS*, int eject );
	WER	(*u_open)	( FDPkt *fdp, const char *fname, int oflag, mode_t mode );
	ER 	(*u_close)	( FDPkt *fdp );
	WER	(*u_lseek)	( FDPkt *fdp, off_t offset, int whence );
	WER	(*u_read)	( FDPkt *fdp, void *buf, size_t nbyte );
	WER	(*u_write)	( FDPkt *fdp, const void *buf, size_t nbyte );
	WER	(*u_getdents)	( FDPkt *fdp, struct dirent *buf, size_t nbyte );
	ER	(*u_fsync)	( FDPkt *fdp );
	ER	(*u_rename)	( FS*, INODE*, INODE*, const char *fname );
	ER	(*u_unlink)	( FS*, INODE* );
	ER	(*u_chmod)	( FS*, INODE*, mode_t mode );
	ER	(*u_fchmod)	( FDPkt *fdp, mode_t mode );
	ER	(*u_mkdir)	( FS*, INODE*, const char *fname, mode_t mode );
	ER	(*u_rmdir)	( FS*, INODE* );
	ER	(*u_utimes)	( FS*, INODE*, const struct timeval times[2] );
	ER	(*u_truncate)	( FS*, INODE*, off_t length );
	ER	(*u_ftruncate)	( FDPkt *fdp, off_t length );
	ER	(*u_stat)	( FS*, INODE*, struct stat *sb );
	ER	(*u_lstat)	( FS*, INODE*, struct stat *sb );
	ER	(*u_fstat)	( FDPkt *fdp, struct stat *sb );
	ER	(*u_getfsstat)	( FS*, struct statfs *buf, int flags );
	ER	(*u_lookup)	( FS*, CDINF *curdir, LPINF *lp);
} ;

/*
 * File reference node
 */
struct FileIndexNode {
	QUEUE		q;		/* For queue connection		*/
	ino_t		ino;		/* File number		*/
	UB		type;		/* File type	*/
	W		refcnt;		/* Reference count		*/
	W		wrefcnt;	/* Writing reference count	*/
	ER		diskerr;	/* DiskI/O error	*/
	VP		exinf;
} ;

/*
 * File discriptor packet
 */
struct FileDescPacket {
	W	fdno;		/* File descriptor number	*/
	FD	*fd;		/* File descriptor	*/
} ;

/*
 * File descriptor
 */
struct FileDescriptor {
	FS	*fs;		/* File system connection information	*/
	INODE	*inode;		/* File reference node		*/
	UW	fpos;		/* Location of file pointer	*/
	UB	omode;		/* Open mode		*/
	W	refcnt;		/* The number of references from process		*/
};

/* --------------------------------------------------------------------------- */

/*
 * Standard file system
 */
typedef struct STDFS_FileSystem {
	UB		dummy;
} SFFS;

/*
 * File reference node
 */
typedef struct STDFS_FileIndexNode {
	INODE		c;		/* File reference node common part	*/
	UW		nlnk;		/* Number of array links		*/

	LINK		link;		/* File link copy	*/
} SFNODE;

/*
 * File descriptor
 */
typedef struct STDFS_FileDescriptor {
	FD		c;		/* File descriptor common part	*/

	W		sffd;		/* File descriptor number	*/
	BOOL		currec;		/* Data record decision flag	*/

	/* Directory information */
	B		*nmbuf;		/* An order of appearance count buffer	*/
	W		bufsz;		/* Buffer size		*/
	TC		*bufend;	/* Buffer termination			*/
} SFFD;

/* --------------------------------------------------------------------------- */

/*
 * ROOT File system connection information
 */
typedef struct ROOT_FileSystem {
	UB		dummy;
} RTFS;

/*
 * ROOT File descriptor
 */
typedef struct ROOT_FileDescriptor {
	FD		c;		/* File descriptor common part	*/
} RTFD;

/*
 * STDIO File system connection information
 */
typedef struct STDIO_FileSystem {
	UB		dummy;
} STDIOFS;

/*
 * STDIO File descriptor
 */
typedef struct STDIO_FileDescriptor {
	FD		c;		/* File descriptor common part	*/
	UB		fileno;		/* Standard input-output number		*/
	W		port;		/* Console I/O port	*/
} STDIOFD;