[PATCH cluster] close #4369: make VMID suggestion strategy configurable

[Daniel Krambrock]

Signed-off-by: Daniel Krambrock <krambrock at hrz.uni-marburg.de>
---
 src/PVE/Cluster.pm          | 1 +
 src/PVE/DataCenterConfig.pm | 9 +++++++++
 2 files changed, 10 insertions(+)

diff --git a/src/PVE/Cluster.pm b/src/PVE/Cluster.pm
index f899dbe..059c7af 100644
--- a/src/PVE/Cluster.pm
+++ b/src/PVE/Cluster.pm
@@ -84,6 +84,7 @@ my $observed = {
     'virtual-guest/profiles.cfg' => 1,
     'mapping/pci.cfg' => 1,
     'mapping/usb.cfg' => 1,
+    'used_vmids.list' => 1,
 };
 
 sub prepare_observed_file_basedirs {
diff --git a/src/PVE/DataCenterConfig.pm b/src/PVE/DataCenterConfig.pm
index abd0bbf..1394623 100644
--- a/src/PVE/DataCenterConfig.pm
+++ b/src/PVE/DataCenterConfig.pm
@@ -337,6 +337,15 @@ my $datacenter_schema = {
 	    format => $next_id_format,
 	    description => "Control the range for the free VMID auto-selection pool.",
 	},
+	'next-id-strategy' => {
+	    optional => 1,
+	    type => 'string',
+            enum => ['next-free', 'max+1', 'list'],
+            default => 'next-free',
+            description => "VMID allocation strategie. 'next-free' returns the lowerst free ID. "
+                ."'max+1' returns the biggerst used ID + 1. "
+                ."'list' returns the lowerst free ID that is not on the list of previously used IDs.",
+	},
 	migration => {
 	    optional => 1,
 	    type => 'string', format => $migration_format,
-- 
2.39.2