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typedef struct Disk	Disk;
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/*
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 *  Reference to the disk
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 */
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struct Disk
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{
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	Bcache;
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	ulong	nb;	/* number of blocks */
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	ulong	nab;	/* number of allocation blocks */
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	int	b2b;	/* allocation bits to a block */
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	int	p2b;	/* Dptr's per page */
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	char	name[CACHENAMELEN];
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};
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int	dinit(Disk*, int, int, char*);
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int	dformat(Disk*, int, char*, ulong, ulong);
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ulong	dalloc(Disk*, Dptr*);
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ulong	dpalloc(Disk*, Dptr*);
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int	dfree(Disk*, Dptr*);
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extern int debug;
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#define DPRINT if(debug)fprint