{ ... }: {
  
  fileSystems."/" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=root" "compress=zstd" "noatime" ];
    };

  fileSystems."/home" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=nix" "compress=zstd" "noatime" ];
    };

  fileSystems."/nix" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=nix" "compress=zstd" "noatime" ];
    };

  fileSystems."/var/log" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=log" "compress=zstd" "noatime" ];
      neededForBoot = true;
    };

  fileSystems."/var/lib" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=lib" "compress=zstd" "noatime" ];
      neededForBoot = true;
    };

  fileSystems."/persist" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=persist" "compress=zstd" "noatime" ];
      neededForBoot = true;
    };

  fileSystems."/boot" =
    { device = "/dev/disk/by-partlabel/boot";
      fsType = "vfat";
      options = [ "fmask=0077" "dmask=0077" ];
    };

  fileSystems."/persist/swap" =
    { device = "/dev/mapper/cryptroot";
      fsType = "btrfs";
      options = [ "subvol=swap" "noatime" "nodatacow" "compress=no" ];
    };
   
  swapDevices = [{
    device = "/persist/swap/swapfile";
    size = 18 * 1024;
  }];

}