diff --git a/disko b/disko
index c84cf52..817c5b6 100755
--- a/disko
+++ b/disko
@@ -72,7 +72,7 @@ while [[ $# -gt 0 ]]; do
       dry_run=y
       ;;
     --root-mountpoint)
-      nix_args+=(--arg rootMountPoint "$2")
+      nix_args+=(--argstr rootMountPoint "$2")
       shift
       ;;
     --no-deps)
diff --git a/example/complex.nix b/example/complex.nix
index 939f71e..1c02ef9 100644
--- a/example/complex.nix
+++ b/example/complex.nix
@@ -39,7 +39,7 @@
               type = "luks";
               name = "crypted1";
               keyFile = "/tmp/secret.key";
-              extraArgs = [
+              extraFormatArgs = [
                 "--iter-time 1"
               ];
               content = {
@@ -67,7 +67,7 @@
               type = "luks";
               name = "crypted2";
               keyFile = "/tmp/secret.key";
-              extraArgs = [
+              extraFormatArgs = [
                 "--iter-time 1"
               ];
               content = {
diff --git a/example/luks-lvm.nix b/example/luks-lvm.nix
index a6879ce..51cd24c 100644
--- a/example/luks-lvm.nix
+++ b/example/luks-lvm.nix
@@ -30,6 +30,7 @@
             content = {
               type = "luks";
               name = "crypted";
+              extraOpenArgs = [ "--allow-discards" ];
               keyFile = "/tmp/secret.key";
               content = {
                 type = "lvm_pv";
diff --git a/flake.lock b/flake.lock
index 1d0d394..c049394 100644
--- a/flake.lock
+++ b/flake.lock
@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1678594102,
-        "narHash": "sha256-OHAHYiMWJFPNxuW/PcOMlSD2tvXnEYC1jxREBADHwwQ=",
+        "lastModified": 1679410443,
+        "narHash": "sha256-xDHO/jixWD+y5pmW5+2q4Z4O/I/nA4MAa30svnZKK+M=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "796b4a3c1d903c4b9270cd2548fe46f524eeb886",
+        "rev": "c9ece0059f42e0ab53ac870104ca4049df41b133",
         "type": "github"
       },
       "original": {
diff --git a/linux-testing-bcachefs.nix b/linux-testing-bcachefs.nix
index 1287803..2d0b99f 100644
--- a/linux-testing-bcachefs.nix
+++ b/linux-testing-bcachefs.nix
@@ -14,7 +14,6 @@ buildLinux (args // {
   src = fetchFromGitHub {
     owner = "koverstreet";
     repo = "bcachefs";
-
     rev = "169b584fb4c8e51aa36e4b3284f9e2e5ce6f30e4";
     sha256 = "sha256-dHKyh5sI+uZ+lSQQRIuicW9ae6uFaJosLtUbiJuMMrI=";
   };
diff --git a/types/luks.nix b/types/luks.nix
index 90fcdcc..350a238 100644
--- a/types/luks.nix
+++ b/types/luks.nix
@@ -15,10 +15,16 @@
       default = null;
       description = "Path to the key for encryption";
     };
-    extraArgs = lib.mkOption {
+    extraFormatArgs = lib.mkOption {
       type = lib.types.listOf lib.types.str;
       default = [ ];
-      description = "Extra arguments";
+      description = "Extra arguments to pass to `cryptsetup luksFormat` when formatting";
+    };
+    extraOpenArgs = lib.mkOption {
+      type = lib.types.listOf lib.types.str;
+      default = [ ];
+      description = "Extra arguments to pass to `cryptsetup luksOpen` when opening";
+      example = [ "--allow-discards" ];
     };
     content = diskoLib.deviceType;
     _meta = lib.mkOption {
@@ -32,8 +38,8 @@
     _create = diskoLib.mkCreateOption {
       inherit config options;
       default = { dev }: ''
-        cryptsetup -q luksFormat ${dev} ${diskoLib.maybeStr config.keyFile} ${toString config.extraArgs}
-        cryptsetup luksOpen ${dev} ${config.name} ${lib.optionalString (config.keyFile != null) "--key-file ${config.keyFile}"}
+        cryptsetup -q luksFormat ${dev} ${diskoLib.maybeStr config.keyFile} ${toString config.extraFormatArgs}
+        cryptsetup luksOpen ${dev} ${config.name} ${toString config.extraOpenArgs} ${lib.optionalString (config.keyFile != null) "--key-file ${config.keyFile}"}
         ${lib.optionalString (config.content != null) (config.content._create {dev = "/dev/mapper/${config.name}";})}
       '';
     };
diff --git a/types/lvm_vg.nix b/types/lvm_vg.nix
index ac7c2fa..70845ff 100644
--- a/types/lvm_vg.nix
+++ b/types/lvm_vg.nix
@@ -44,7 +44,7 @@
             vgchange -a y
             ${lib.concatMapStrings (x: x.dev or "") (lib.attrValues lvMounts)}
           '';
-          fs = lvMounts.fs;
+          fs = lvMounts.fs or { };
         };
     };
     _config = lib.mkOption {
diff --git a/types/table.nix b/types/table.nix
index fee81a5..b47ed29 100644
--- a/types/table.nix
+++ b/types/table.nix
@@ -38,9 +38,7 @@
           partMounts = diskoLib.deepMergeMap (partition: partition._mount { inherit dev; }) config.partitions;
         in
         {
-          dev = ''
-            ${lib.concatMapStrings (x: x.dev or "") (lib.attrValues partMounts)}
-          '';
+          dev = partMounts.dev or "";
           fs = partMounts.fs or { };
         };
     };