diff --git a/src/filo-fs-ext2.ads b/src/filo-fs-ext2.ads
index 8e64a5d..96c3597 100644
--- a/src/filo-fs-ext2.ads
+++ b/src/filo-fs-ext2.ads
@@ -80,12 +80,18 @@
    type Inode_Type is (Dir, Regular, Link, Fast_Link);
    type Inode_Length is range 0 .. 2 ** 46;
 
+   type Inode_Map_Cache is record
+      Phys     : FSBlock_Offset := 0;
+      Logical  : Block_Offset := Block_Offset'Last;
+   end record;
+
    type Inode_Info is record
       I           : Inode_Index := Inode_Index'First;
       Mode        : Inode_Type := Inode_Type'First;
       Size        : Inode_Length := 0;
       Use_Extents : Boolean := False;
       Inline      : Inode_Extents := (others => 16#00#);
+      Map_Cache   : Inode_Map_Cache := (others => <>);
    end record;
 
    type Group_Index is new Inode_0_Index;