Fix brown-paper-bag bug with MemNodeFs.

fuse/memnode.go

@@ -124,7 +124,7 @@ func (n *memNode) Create(name string, flags uint32, mode uint32, context *Contex
 	ch := n.newNode(false)
 	ch.info.Mode = mode | S_IFREG
 
-	f, err := os.Create(n.filename())
+	f, err := os.Create(ch.filename())
 	if err != nil {
 		return nil, nil, ToStatus(err)
 	}

fuse/memnode_test.go

@@ -40,6 +40,20 @@ func setupMemNodeTest(t *testing.T) (wd string, fs *MemNodeFs, clean func()) {
 
 }
 
+func TestMemNodeFsWrite(t *testing.T) {
+	wd, _, clean := setupMemNodeTest(t)
+	defer clean()
+
+	want := "hello"
+	err := ioutil.WriteFile(wd+"/test", []byte(want), 0644)
+	CheckSuccess(err)
+
+	content, err := ioutil.ReadFile(wd +"/test")
+	if string(content) != want {
+		t.Fatalf("content mismatch: got %q, want %q", content, want)
+	}
+}
+
 func TestMemNodeFs(t *testing.T) {
 	wd, _, clean := setupMemNodeTest(t)
 	defer clean()