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upas/fs: use IOUNIT

--- a/sys/src/cmd/upas/fs/fs.c

+++ b/sys/src/cmd/upas/fs/fs.c

@@ -116,11 +116,11 @@

 ulong	cachetarg = Maxcache;

 Mailbox	*mbl;

-static	int	messagesize = 8*1024 + IOHDRSZ;

+static	int	messagesize = IOUNIT + IOHDRSZ;

 static	int	mfd[2];

 static	char	hbuf[32*1024];

-static	uchar	mbuf[16*1024 + IOHDRSZ];

-static	uchar	mdata[16*1024 + IOHDRSZ];

+static	uchar	mbuf[IOUNIT];

+static	uchar	mdata[IOUNIT + IOHDRSZ];

 static	ulong	path;		/* incremented for each new file */

 static	Hash	*htab[2053];

 static	Fcall	rhdr;