/*  * 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 Usbfs Usbfs;typedef struct Fid Fid; enum{	Hdrsize	= 128,		/* plenty of room for headers */	Msgsize	= 8216,		/* our preferred iounit (also devmnt's) */	Bufsize	= Hdrsize + Msgsize,	Namesz = 40,	Errmax = 128,	ONONE = ~0,		/* omode in Fid when not open */}; struct Fid{	int	fid;	Qid	qid;	int	omode;	Fid*	next;	void*	aux;}; struct Usbfs{	char	name[Namesz];	uvlong	qid;	Dev*	dev;	void*	aux; 	int	(*walk)(Usbfs *fs, Fid *f, char *name);	void	(*clone)(Usbfs *fs, Fid *of, Fid *nf);	void	(*clunk)(Usbfs *fs, Fid *f);	int	(*open)(Usbfs *fs, Fid *f, int mode);	long	(*read)(Usbfs *fs, Fid *f, void *data, long count, vlong offset);	long	(*write)(Usbfs *fs, Fid*f, void *data, long count, vlong offset);	int	(*stat)(Usbfs *fs, Qid q, Dir *d);	void	(*end)(Usbfs *fs);}; typedef int (*Dirgen)(Usbfs*, Qid, int, Dir*, void*); long	usbreadbuf(void *data, long count, vlong offset, void *buf, long n);void	usbfsadd(Usbfs *dfs);void	usbfsdel(Usbfs *dfs);int	usbdirread(Usbfs*f, Qid q, char *data, long cnt, vlong off, Dirgen gen, void *arg);void	usbfsinit(char* srv, char *mnt, Usbfs *f, int flag); void	usbfsdirdump(void); extern char Enotfound[];extern char Etoosmall[];extern char Eio[];extern char Eperm[];extern char Ebadcall[];extern char Ebadfid[];extern char Einuse[];extern char Eisopen[];extern char Ebadctl[]; extern Usbfs usbdirfs;extern int usbfsdebug;