Create nixwork device.

nodes/hosts/nixwork/system/filesystems.nix

@@ -0,0 +1,54 @@
+{ ... }: {
+  
+  fileSystems."/" =
+    { device = "/dev/mapper/cryptroot";
+      fsType = "btrfs";
+      options = [ "subvol=root" "compress=zstd" "noatime" ];
+    };
+
+  fileSystems."/home" =
+    { device = "/dev/mapper/cryptroot";
+      fsType = "btrfs";
+      options = [ "subvol=home" "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" ];
+    };
+
+  swapDevices = [{
+    device = "/swapfile";
+    size = 18 * 1024;
+  }];
+
+}
+