From ac4309657b0eb7fab1b5d2ca3cb14a720318b3f1 Mon Sep 17 00:00:00 2001
From: Daniel Lundin <dln@arity.se>
Date: Wed, 16 Oct 2024 17:05:33 +0200
Subject: [PATCH] erofs: use multithreading in mkfs when possible

---
 modules/partitions.nix | 5 +++--
 overlays/default.nix   | 1 +
 2 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/modules/partitions.nix b/modules/partitions.nix
index fa1fe5c..13aa6de 100644
--- a/modules/partitions.nix
+++ b/modules/partitions.nix
@@ -21,9 +21,10 @@
 
       mkfsOptions = {
         erofs = [
-          # "-zzstd,6" # Zstd compression
+          "-zzstd,6" # Zstd compression
           "-T0" # Fixed timestamp for all files
-          "-Efragments,dedupe,ztailpacking" # Extended options
+          "-C65536" # 64 KiB cluster size
+          # "-Efragments,dedupe,ztailpacking" # Extra features
         ];
       };
 
diff --git a/overlays/default.nix b/overlays/default.nix
index 0ef9a38..b84ffbb 100644
--- a/overlays/default.nix
+++ b/overlays/default.nix
@@ -3,6 +3,7 @@ final: prev: {
   erofs-utils = prev.erofs-utils.overrideAttrs (old: {
     buildInputs = old.buildInputs ++ [ prev.zstd ];
     configureFlags = old.configureFlags ++ [
+      "--enable-multithreading"
       "--enable-zstd"
     ];
   });