add btrfs module

modules/misc/btrfs.nix

@@ -0,0 +1,15 @@
+{config, lib, ...}:
+with lib;
+let
+  cfg = config.custom.misc.btrfs;
+in
+{
+  options.custom.misc.btrfs = {
+    enable = mkEnableOption "Enables btrfs scrubbing";
+  };
+  
+  config = mkIf cfg.enable {
+    services.btrfs.autoScrub.enable = true;
+  };
+}
+

modules/misc/default.nix

@@ -2,12 +2,13 @@
 {
   imports = [
     ./backup.nix
-    ./wireshark.nix
-    ./virt-manager.nix
-    ./nftables.nix
+    ./btrfs.nix
     ./cli-tools.nix
-    ./tmpfs.nix
-    ./static-ip.nix
     ./docker.nix
+    ./nftables.nix
+    ./static-ip.nix
+    ./tmpfs.nix
+    ./virt-manager.nix
+    ./wireshark.nix
   ];
 }