diff --git a/Cargo.lock b/Cargo.lock
index 48da1de..a35616f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -19,9 +19,12 @@ checksum = "0c4b4d0bd25bd0b74681c0ad21497610ce1b7c91b1022cd21c80c6fbdd9476b0"
 
 [[package]]
 name = "bitflags"
-version = "2.5.0"
+version = "2.6.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf4b9d6a944f767f8e5e0db018570623c85f3d925ac718db4e06d0187adb21c1"
+checksum = "b048fb63fd8b5923fc5aa7b340d8e156aec7ec02f0c78fa8a6ddc2613f6f71de"
+dependencies = [
+ "serde",
+]
 
 [[package]]
 name = "byteorder"
@@ -77,6 +80,7 @@ checksum = "ef1a6892d9eef45c8fa6b9e0086428a2cca8491aca8f787c534a3d6d0bcb3ced"
 name = "file_rpc"
 version = "0.1.0"
 dependencies = [
+ "bitflags",
  "parking_lot",
  "postcard",
  "serde",
diff --git a/src/main.rs b/src/main.rs
index 2edc0b9..4b6aef2 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -43,6 +43,11 @@ impl fs_rpc::Server for Serv {
             .push((mount_id as usize, file_offset, file_size));
         Ok((None, (self.files.read().len() - 1) as u64))
     }
+
+    fn open_dir(&self, path: &std::path::Path, mount_id: u64) -> Result<(Option<u64>, u64), ()> {
+        // TODO
+        Err(())
+    }
 }
 
 impl file_rpc::Server for Serv {