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tapefs: use IOUNIT for Maxbuf

--- a/sys/src/cmd/tapefs/tapefs.h

+++ b/sys/src/cmd/tapefs/tapefs.h

@@ -8,8 +8,7 @@

 enum

 {

 	OPERM	= 0x3,		/* mask of all permission types in open mode */

-	Nram	= 512,

-	Maxbuf	= 8192,		/* max buffer size */

+	Maxbuf	= IOUNIT,	/* max buffer size */

 };

 typedef struct Fid Fid;

--- a/sys/src/cmd/tapefs/tapfs.c

+++ b/sys/src/cmd/tapefs/tapfs.c

@@ -18,7 +18,7 @@

 } dir[192];

 int	tapefile;

-char	buffer[8192];

+char	buffer[Maxbuf];

 long	cvtime(unsigned char *);

 extern	int verbose;

 extern	int newtap;

--- a/sys/src/cmd/tapefs/tpfs.c

+++ b/sys/src/cmd/tapefs/tpfs.c

@@ -21,7 +21,7 @@

 	unsigned char	checksum[2];

 } dir[496+8];

-char	buffer[8192];

+char	buffer[Maxbuf];

 int	tapefile;

 void