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cdfs: use IOUNIT for maxrpc (thanks Arne Meyer)

--- a/sys/src/cmd/cdfs/dat.h

+++ b/sys/src/cmd/cdfs/dat.h

@@ -132,12 +132,7 @@

 	CDNblock = 12,		/* chosen for CD */

 	DVDNblock = 16,		/* DVD ECC block is 16 sectors */

 	BDNblock = 32,		/* BD ECC block (`cluster') is 32 sectors */

-	/*

-	 * number of blocks read/written must fit in this. if we don't do this,

-	 * remote access (e.g., via /mnt/term/dev/sd* or nusb/disk) fails mysteriously.

-	 * see /sys/src/9/port/devmnt.c MAXRPC.

-	 */

-	Maxrpc = 8192,

+	Maxrpc = IOUNIT,

 };

 typedef struct Buf Buf;