tape: add pmt weof

src/tape/drive/linux_tape.rs

@@ -193,6 +193,16 @@ impl LinuxTapeHandle {
         Ok(())
     }
 
+    pub fn mtop(&mut self, mt_op: MTCmd, mt_count: i32, msg: &str) -> Result<(), Error> {
+        let cmd = mtop { mt_op, mt_count };
+
+        unsafe {
+            mtioctop(self.file.as_raw_fd(), &cmd)
+        }.map_err(|err| format_err!("{} failed (count {}) - {}", msg, mt_count, err))?;
+
+        Ok(())
+    }
+
     pub fn mtload(&mut self) -> Result<(), Error> {
 
         let cmd = mtop { mt_op: MTCmd::MTLOAD, mt_count: 1, };

src/tape/drive/mod.rs

@@ -1,7 +1,8 @@
 //! Tape drivers
 
 mod virtual_tape;
-mod linux_mtio;
+
+pub mod linux_mtio;
 
 mod tape_alert_flags;
 pub use tape_alert_flags::*;