{ config, lib, pkgs, ... }:
with lib; {

  options.fileSystems = lib.mkOption {
    type = types.attrsOf (types.submodule ({ name, config, ... }: {
      options.block = {

        device = lib.mkOption { type = types.int; };

        driver = lib.mkOption { type = types.enum [ "ahci" ]; };

        partition = lib.mkOption { type = types.ints.positive; };

      };
    }));
  };

  config = {

    assertions = [{
      assertion = config.fileSystems."/".fsType == "ext2";
      message = "The only supported fsType is EXT2";
    }];

    hardware.genode.ahci.enable =
      any (fs: fs.block.driver == "ahci") (attrValues config.fileSystems);
  };

}