Adds Uio::remaining

Author: ultimaweapon

kernel-1100/src/uio.rs

@@ -51,4 +51,8 @@ impl okf::uio::Uio<Kernel> for Uio {
             td,
         })
     }
+
+    fn remaining(&self) -> isize {
+        self.res
+    }
 }

src/uio/mod.rs

@@ -25,6 +25,9 @@ pub trait Uio<K: Kernel>: Sized {
     fn io_max() -> usize {
         0x7fffffff
     }
+
+    /// Returns `uio_resid`.
+    fn remaining(&self) -> isize;
 }
 
 /// Represents `uio_seg` enum.