Rename the src directory to kernel.

kernel/scheme/mod.rs

@@ -0,0 +1,12 @@
+/// A scheme is a primitive for handling filesystem syscalls in Redox.
+/// Schemes accept paths from the kernel for `open`, and file descriptors that they generate
+/// are then passed for operations like `close`, `read`, `write`, etc.
+///
+/// The kernel validates paths and file descriptors before they are passed to schemes,
+/// also stripping the scheme identifier of paths if necessary.
+pub trait Scheme {
+    /// Open the file at `path` with `flags`.
+    ///
+    /// Returns a file descriptor or an error
+    fn open(path: &str, flags: usize) -> Result<usize>;
+}