Add seek function

src/main.rs

@@ -35,7 +35,6 @@ impl file_rpc::Server for FileServ {
     fn read(
         &self,
         _fd: u64,
-        _pos: u64,
         len: usize,
     ) -> std::result::Result<std::borrow::Cow<'_, [u8]>, ()> {
         let mut encode_buf = [0u8; 4];
@@ -58,7 +57,7 @@ impl file_rpc::Server for FileServ {
         Ok(buf.into())
     }
 
-    fn write(&self, _fd: u64, _pos: u64, _data: &[u8]) -> Result<(), ()> {
+    fn write(&self, _fd: u64, _data: &[u8]) -> Result<(), ()> {
         Err(())
     }
 
@@ -103,6 +102,8 @@ impl file_rpc::Server for FileServ {
     fn cancel_poll(&self, poll_id: u64) {
         self.polls.lock().remove(poll_id as usize);
     }
+
+    fn seek(&self, _fd: u64, _pos: file_rpc::SeekFrom) -> u64 { 0 }
 }
 
 static SCANDODE_DECODER: Mutex<ScancodeSet2> = Mutex::new(ScancodeSet2::new());