create & open efs.

easy-fs/src/lib.rs

@@ -0,0 +1,15 @@
+extern crate alloc;
+
+mod block_dev;
+mod layout;
+mod efs;
+mod dirty;
+mod bitmap;
+mod vfs;
+
+pub const BLOCK_SZ: usize = 512;
+pub use block_dev::BlockDevice;
+pub use efs::EasyFileSystem;
+use layout::*;
+use dirty::Dirty;
+use bitmap::Bitmap;