From 2067a7ec7f4c8a353b8e2ece15a6a997e50808b0 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 2 Jun 2023 11:41:40 +0200
Subject: [PATCH] detach-md: similar to the DM case, also don't try to detach
 MD device backing /usr/

---
 src/shutdown/detach-md.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/shutdown/detach-md.c b/src/shutdown/detach-md.c
index d5188ea822..ae592f6f31 100644
--- a/src/shutdown/detach-md.c
+++ b/src/shutdown/detach-md.c
@@ -129,15 +129,18 @@ static int delete_md(RaidDevice *m) {
 
 static int md_points_list_detach(RaidDevice **head, bool *changed, bool last_try) {
         int n_failed = 0, r;
-        dev_t rootdev = 0;
+        dev_t rootdev = 0, usrdev = 0;
 
         assert(head);
         assert(changed);
 
         (void) get_block_device("/", &rootdev);
+        (void) get_block_device("/usr", &usrdev);
 
         LIST_FOREACH(raid_device, m, *head) {
-                if (major(rootdev) != 0 && rootdev == m->devnum) {
+                if ((major(rootdev) != 0 && rootdev == m->devnum) ||
+                    (major(usrdev) != 0 && usrdev == m->devnum)) {
+                        log_debug("Not detaching MD %s that backs the OS itself, skipping.", m->path);
                         n_failed ++;
                         continue;
                 }