From 5359d90b151f2a427becd25887512c4e4a8e6a0b Mon Sep 17 00:00:00 2001
From: Symphorien Gibol <symphorien+git@xlumurb.eu>
Date: Fri, 14 Feb 2020 12:00:00 +0000
Subject: [PATCH] nixos/btrfs: make autoScrub not prevent shutdown or suspend

Fixes: #79086 #79017
---
 nixos/modules/tasks/filesystems/btrfs.nix | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/nixos/modules/tasks/filesystems/btrfs.nix b/nixos/modules/tasks/filesystems/btrfs.nix
index 48be18c71021..f64493e1a3c7 100644
--- a/nixos/modules/tasks/filesystems/btrfs.nix
+++ b/nixos/modules/tasks/filesystems/btrfs.nix
@@ -118,12 +118,17 @@ in
           fs' = utils.escapeSystemdPath fs;
         in nameValuePair "btrfs-scrub-${fs'}" {
           description = "btrfs scrub on ${fs}";
+          # scrub prevents suspend2ram or proper shutdown
+          conflicts = [ "shutdown.target" "sleep.target" ];
+          before = [ "shutdown.target" "sleep.target" ];
 
           serviceConfig = {
-            Type = "oneshot";
+            # simple and not oneshot, otherwise ExecStop is not used
+            Type = "simple";
             Nice = 19;
             IOSchedulingClass = "idle";
             ExecStart = "${pkgs.btrfs-progs}/bin/btrfs scrub start -B ${fs}";
+            ExecStop  = "${pkgs.btrfs-progs}/bin/btrfs scrub cancel ${fs}";
           };
         };
       in listToAttrs (map scrubService cfgScrub.fileSystems);