Add an unusedX entry for the old value when a mpY entry is
updated. This is already done on mp deletion.
---
 src/PVE/LXC.pm | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/PVE/LXC.pm b/src/PVE/LXC.pm
index a737fc0..84aba83 100644
--- a/src/PVE/LXC.pm
+++ b/src/PVE/LXC.pm
@@ -1352,6 +1352,12 @@ sub update_pct_config {
         } elsif ($opt =~ m/^mp(\d+)$/) {
            next if $hotplug_error->($opt);
            check_protection($conf, "can't update CT $vmid drive '$opt'");
+           if (defined($conf->{$opt})) {
+               my $mountpoint = parse_ct_mountpoint($conf->{$opt});
+               if ($mountpoint->{type} eq 'volume') {
+                   add_unused_volume($conf, $mountpoint->{volume})
+               }
+           }
            $conf->{$opt} = $value;
            $new_disks = 1;
         } elsif ($opt eq 'rootfs') {
-- 
2.1.4


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