tape/drive: add 'move_to_file' to TapeDriver trait

so that we can directly move to a specified file on the tape

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>

src/tape/drive/mod.rs

@@ -80,6 +80,9 @@ pub trait TapeDriver {
     /// Move to last file
     fn move_to_last_file(&mut self) -> Result<(), Error>;
 
+    /// Move to given file nr
+    fn move_to_file(&mut self, file: u64) -> Result<(), Error>;
+
     /// Current file number
     fn current_file_number(&mut self) -> Result<u64, Error>;