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typedef struct MLock	MLock;
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typedef	struct Iosect	Iosect;
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typedef	struct Iotrack	Iotrack;
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typedef struct Track	Track;
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typedef struct Xfs	Xfs;
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struct MLock
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{
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	char	key;
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};
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struct Iosect
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{
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	Iosect *next;
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	short	flags;
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	MLock	lock;
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	Iotrack *t;
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	uchar *	iobuf;
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};
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struct Iotrack
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{
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	short	flags;
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	Xfs *	xf;
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	long	addr;
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	Iotrack	*next;		/* in lru list */
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	Iotrack	*prev;
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	Iotrack	*hnext;		/* in hash list */
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	Iotrack	*hprev;
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	MLock	lock;
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	int	ref;
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	Track	*tp;
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};
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enum{
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	Sectorsize = 512,
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	Sect2trk = 9,
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	Trksize = Sectorsize*Sect2trk
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};
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struct Track
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{
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	Iosect *p[Sect2trk];
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	uchar	buf[Sect2trk][Sectorsize];
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};
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#define	BMOD		(1<<0)
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#define	BIMM		(1<<1)
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#define	BSTALE		(1<<2)
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Iosect*	getiosect(Xfs*, long, int);
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Iosect*	getosect(Xfs*, long);
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Iosect*	getsect(Xfs*, long);
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Iosect*	newsect(void);
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Iotrack*	getiotrack(Xfs*, long);
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int	canmlock(MLock*);
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int	devcheck(Xfs*);
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int	devread(Xfs*, long, void*, long);
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int	devwrite(Xfs*, long, void*, long);
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int	tread(Iotrack*);
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int	twrite(Iotrack*);
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void	freesect(Iosect*);
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void	iotrack_init(void);
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void	mlock(MLock*);
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void	purgebuf(Xfs*);
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void	purgetrack(Iotrack*);
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void	putsect(Iosect*);
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void	sync(void);
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void	unmlock(MLock*);