diff --git a/src/lib.rs b/src/lib.rs
index 3c9158d..9a83170 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -14,6 +14,7 @@ const PROTO: u16 = 3;
 pub trait Server: Send + Sync {
     fn mount(&self, dev: &Path) -> Result<u64, ()>;
     fn open(&self, path: &Path, mount_id: u64) -> Result<(Option<u64>, u64), ()>;
+    fn open_dir(&self, path: &Path, mount_id: u64) -> Result<(Option<u64>, u64), ()>;
 }
 
 #[derive(Copy, Clone)]
@@ -44,6 +45,19 @@ impl Client {
         )
         .unwrap()
     }
+
+    pub fn open_dir(self, path: &Path, mount_id: u64) -> Result<(Option<u64>, u64), ()> {
+        postcard::from_bytes(
+            &rpc::send_call(
+                self.0,
+                PROTO,
+                2,
+                &postcard::to_stdvec(&(path, mount_id)).unwrap(),
+            )
+            .get_return(),
+        )
+        .unwrap()
+    }
 }
 
 pub fn register_server(server: Box<dyn Server>) {
@@ -67,5 +81,9 @@ fn callback(call: IncomingCall) {
         let (path, mount_id) = postcard::from_bytes(call.args()).unwrap();
         let ret = postcard::to_stdvec(&server.open(path, mount_id)).unwrap();
         call.send_return(&ret);
+    } else if call.func == 2 {
+        let (path, mount_id) = postcard::from_bytes(call.args()).unwrap();
+        let ret = postcard::to_stdvec(&server.open_dir(path, mount_id)).unwrap();
+        call.send_return(&ret);
     }
 }