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ip/ftpfs: fix totally broken messagesize, use IOUNIT

--- a/sys/src/cmd/ip/ftpfs/ftpfs.c

+++ b/sys/src/cmd/ip/ftpfs/ftpfs.c

@@ -19,9 +19,9 @@

 Fid	*fids;			/* linked list of fids */

 char	errstring[128];		/* error to return */

 int	mfd;			/* fd for 9fs */

-int	messagesize = 4*1024*IOHDRSZ;

-uchar	mdata[8*1024*IOHDRSZ];

-uchar	mbuf[8*1024*IOHDRSZ];

+int	messagesize = IOUNIT+IOHDRSZ;

+uchar	mdata[IOUNIT+IOHDRSZ];

+uchar	mbuf[IOUNIT];

 Fcall	rhdr;

 Fcall	thdr;

 int	debug;

@@ -648,7 +648,7 @@

 fatal(char *fmt, ...)

 {

 	va_list arg;

-	char buf[8*1024];

+	char buf[1024];

 	dying = 1;

--- a/sys/src/cmd/ip/ftpfs/ftpfs.h

+++ b/sys/src/cmd/ip/ftpfs/ftpfs.h

@@ -107,6 +107,4 @@

 #define TIMEOUT 5*60

 #define DMSYML 0x10000000

-#define MAXFDATA 8192

-

 extern char	net[];		/* network for connections */