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gefs: reject invalid modes on create, not just wstat

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

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

@@ -1804,6 +1804,8 @@

 		error(e);

 	if(m->perm & (DMMOUNT|DMAUTH))

 		error(Ebotch);

+	if(m->perm & ~(DMDIR|DMAPPEND|DMEXCL|DMTMP|0777))

+		error(Ewstatb);

 	if((f = getfid(m->conn, m->fid)) == nil)

 		error(Enofid);

 	if(waserror()){

-- 

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