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gefs: copy mode down on create, don't truncate walks with no DMEXEC

we were copying the owner and group of the parent dir into the fid
on create, but we forgot the mode; fix that, so that we don't check
perms against the wrong dir.

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

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

@@ -1255,7 +1255,7 @@

 		if(strlen(name) > Maxname)

 			error(Elength);

 		if(fsaccess(o, d.mode, d.uid, d.gid, DMEXEC) != 0)

-			error(Eperm);

+			break;

 		if(d.qid.path == Qdump){

 			if((mnt = getmount(m->wname[i])) == nil)

 				error(Esrch);

@@ -1604,7 +1604,7 @@

 fscreate(Fmsg *m)

 {

 	char *p, *e, buf[Kvmax], upkbuf[Keymax], upvbuf[Inlmax];

-	int nm, duid, dgid;

+	int nm, duid, dgid, dmode;

 	Dent *de;

 	vlong oldlen;

 	Qid old;

@@ -1650,6 +1650,7 @@

 	}

 	duid = de->uid;

 	dgid = de->gid;

+	dmode = de->mode;

 	runlock(de);

 	nm = 0;

@@ -1703,6 +1704,7 @@

 	f->dent = de;

 	f->duid = duid;

 	f->dgid = dgid;

+	f->dmode = dmode;

 	if(m->mode & ORCLOSE)

 		f->rclose = emalloc(sizeof(Amsg), 1);

-- 

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