/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ typedef	struct Ioclust	Ioclust;typedef	struct Iobuf	Iobuf;typedef	struct Isofile	Isofile;typedef struct Xdata	Xdata;typedef struct Xfile	Xfile;typedef struct Xfs	Xfs;typedef struct Xfsub	Xfsub; #pragma incomplete Isofile enum{	Sectorsize = 2048,	Maxname = 256,}; struct Iobuf{	Ioclust* clust;	long	addr;	uchar*	iobuf;}; struct Ioclust{	long	addr;			/* in sectors; good to 8TB */	Xdata*	dev;	Ioclust* next;	Ioclust* prev;	int	busy;	int	nbuf;	Iobuf*	buf;	uchar*	iobuf;}; struct Xdata{	Xdata*	next;	char*	name;		/* of underlying file */	Qid	qid;	short	type;	short	fdev;	int	ref;		/* attach count */	int	dev;		/* for read/write */}; struct Xfsub{	void	(*reset)(void);	int	(*attach)(Xfile*);	void	(*clone)(Xfile*, Xfile*);	void	(*walkup)(Xfile*);	void	(*walk)(Xfile*, char*);	void	(*open)(Xfile*, int);	void	(*create)(Xfile*, char*, long, int);	long	(*readdir)(Xfile*, uchar*, long, long);	long	(*read)(Xfile*, char*, vlong, long);	long	(*write)(Xfile*, char*, vlong, long);	void	(*clunk)(Xfile*);	void	(*remove)(Xfile*);	void	(*stat)(Xfile*, Dir*);	void	(*wstat)(Xfile*, Dir*);}; struct Xfs{	Xdata*	d;		/* how to get the bits */	Xfsub*	s;		/* how to use them */	int	ref;	int	issusp;	/* follows system use sharing protocol */	long	suspoff;	/* if so, offset at which SUSP area begins */	int	isrock;	/* Rock Ridge format */	int	isplan9;	/* has Plan 9-specific directory info */	Qid	rootqid;	Isofile*	ptr;		/* private data */}; struct Xfile{	Xfile*	next;		/* in fid hash bucket */	Xfs*	xf;	long	fid;	ulong	flags;	Qid	qid;	int	len;		/* of private data */	Isofile*	ptr;}; enum{	Asis,	Clean,	Clunk}; enum{	Oread = 1,	Owrite = 2,	Orclose = 4,	Omodes = 3,}; extern char	Enonexist[];	/* file does not exist */extern char	Eperm[];	/* permission denied */extern char	Enofile[];	/* no file system specified */extern char	Eauth[];	/* authentication failed */ extern char	*srvname;extern char	*deffile;extern int	chatty;extern jmp_buf	err_lab[];extern int	nerr_lab;extern char	err_msg[]; extern int nojoliet;extern int noplan9;extern int norock;