diff --git a/src/lib9pclient/open.c b/src/lib9pclient/open.c
index e9fb981..2317bbb 100644
--- a/src/lib9pclient/open.c
+++ b/src/lib9pclient/open.c
@@ -7,6 +7,7 @@
 CFid*
 fsopen(CFsys *fs, char *name, int mode)
 {
+	char e[ERRMAX];
 	CFid *fid;
 	Fcall tx, rx;
 
@@ -16,7 +17,9 @@
 	tx.fid = fid->fid;
 	tx.mode = mode;
 	if(_fsrpc(fs, &tx, &rx, 0) < 0){
+		rerrstr(e, sizeof e);
 		fsclose(fid);
+		errstr(e, sizeof e);
 		return nil;
 	}
 	fid->mode = mode;
diff --git a/src/lib9pclient/write.c b/src/lib9pclient/write.c
index f4eab96..9f90858 100644
--- a/src/lib9pclient/write.c
+++ b/src/lib9pclient/write.c
@@ -53,7 +53,7 @@
 		want = n - tot;
 		if(want > msize)
 			want = msize;
-		got = _fspwrite(fid, buf, want, offset);
+		got = _fspwrite(fid, buf+tot, want, offset);
 		first = 0;
 		if(got < 0){
 			if(tot == 0)