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typedef struct Bbuf	Bbuf;
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typedef struct Bcache	Bcache;
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enum
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{
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	Nbcache=	32,		/* number of blocks kept in pool */
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};
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/*
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 *  block cache descriptor
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 */
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struct Bbuf
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{
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	Lru;				/* must be first in struct */
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	ulong	bno;
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	int	inuse;
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	Bbuf	*next;			/* next in dirty list */
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	int	dirty;
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	char	*data;
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};
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/*
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 *  the buffer cache
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 */
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struct Bcache
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{
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	Lru;
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	int	bsize;			/* block size in bytes */
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	int	f;			/* fd to disk */
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	Bbuf	*dfirst;		/* dirty list */
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	Bbuf	*dlast;
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	Bbuf	bb[Nbcache];
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};
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int	bcinit(Bcache*, int, int);
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Bbuf*	bcalloc(Bcache*, ulong);
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Bbuf*	bcread(Bcache*, ulong);
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void	bcmark(Bcache*, Bbuf*);
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int	bcwrite(Bcache*, Bbuf*);
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int	bcsync(Bcache*);
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int	bread(Bcache*, ulong, void*);
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int	bwrite(Bcache*, ulong, void*);
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int	bref(Bcache*, Bbuf*);
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void	error(char*, ...);
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void	warning(char*);