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2 - 1 
typedef struct Ibuf	Ibuf;
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typedef struct Imap	Imap;
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typedef struct Icache	Icache;
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enum
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{
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	Nicache=	64,		/* number of inodes kept in pool */
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};
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/*
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 *  a cached inode buffer
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 */
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struct Ibuf
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{
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	Lru;			/* must be first in structure */
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	int	inuse;		/* non-0 if in use */
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	ulong	ino;		/* index into inode table */
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	Inode	inode;		/* the inode contents */
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};
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/*
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 *  in-core qid to inode mapping
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 */
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struct Imap
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{
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	Lru;			/* must be first in structure */
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	Qid	qid;
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	Ibuf	*b;		/* cache buffer */
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	int	inuse;		/* non-0 if in use */
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};
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/*
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 *  the inode cache
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 */
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struct Icache
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{
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	Disk;
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	int	nino;		/* number of inodes */
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	ulong	ib0;		/* first inode block */
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	int	nib;		/* number of inode blocks */
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	int	i2b;		/* inodes to a block */
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	Ibuf	ib[Nicache];	/* inode buffers */
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	Lru	blru;
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	Imap	*map;		/* inode to qid mapping */
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	Lru	mlru;
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};
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Ibuf*	ialloc(Icache*, ulong);
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Ibuf*	iget(Icache*, Qid);
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Ibuf*	iread(Icache*, ulong);
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int	iformat(Icache*, int, ulong, char*, int, int);
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int	iinit(Icache*, int, int, char*);
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int	iremove(Icache*, ulong);
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int	iupdate(Icache*, ulong, Qid);
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int	iwrite(Icache*, Ibuf*);
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void	ifree(Icache*, Ibuf*);
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void	iinc(Icache*, Ibuf*);