Don't print warning for splicing zero length file.

fuse/loopback_test.go

@@ -525,6 +525,19 @@ func TestFSync(t *testing.T) {
 	f.Close()
 }
 
+func TestReadZero(t *testing.T) {
+	ts := NewTestCase(t)
+	defer ts.Cleanup()
+	err := ioutil.WriteFile(ts.origFile, []byte{}, 0644)
+	CheckSuccess(err)
+
+	back, err := ioutil.ReadFile(ts.mountFile)
+	CheckSuccess(err)
+	if len(back) != 0 {
+		t.Errorf("content length: got %d want %d", len(back), 0)
+	}
+}
+
 func TestReadLarge(t *testing.T) {
 	ts := NewTestCase(t)
 	defer ts.Cleanup()

fuse/mountstate.go

@@ -399,7 +399,7 @@ func (ms *MountState) TrySplice(header []byte, req *request,
 	} else {
 		n, err = finalSplice.LoadFromAt(fd, size, off)
 	}
-	if err == io.EOF || (err == nil && n < size && n > 0) {
+	if err == io.EOF || (err == nil && n < size) {
 		discard := make([]byte, len(header))
 		_, err = finalSplice.Read(discard)
 		if err != nil {