feat(ext4): seek, rmdir (e2fsck-clean)

crates/servers/storage-server/src/adapters/mock_fs.rs

@@ -130,4 +130,13 @@ impl FileSystem for MockFileSystem {
     }
 
     fn mkdir(&mut self, _path: &[u8]) -> bool { true }
+
+    /// Files are read from the start and written at the end only.
+    fn seek(&mut self, _handle: FileHandle, _offset: usize) -> bool {
+        false
+    }
+
+    fn rmdir(&mut self, _path: &[u8]) -> bool {
+        false
+    }
 }