[pve-devel] [PATCH qemu-server 2/2] backup: use dirty-bitmap for PBS only if supported by QEMU

[Stefan Reiter <s.reiter@proxmox.com>]

If 'query-proxmox-support' is not known to QEMU, assume that no other
features are supported either.

Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
---

Does not require any version bumps, since it handles failure gracefully.

 PVE/VZDump/QemuServer.pm | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/PVE/VZDump/QemuServer.pm b/PVE/VZDump/QemuServer.pm
index 567088c..3c2a334 100644
--- a/PVE/VZDump/QemuServer.pm
+++ b/PVE/VZDump/QemuServer.pm
@@ -443,6 +443,8 @@ sub archive_pbs {
 	    die "interrupted by signal\n";
 	};
 
+	my $qemu_support = eval { mon_cmd($vmid, "query-proxmox-support") } // {};
+
 	my $fs_frozen = $self->qga_fs_freeze($task, $vmid);
 
 	my $params = {
@@ -453,11 +455,13 @@ sub archive_pbs {
 	    password => $password,
 	    devlist => $devlist,
 	    'config-file' => $conffile,
-	    'use-dirty-bitmap' => JSON::true,
 	};
 	$params->{fingerprint} = $fingerprint if defined($fingerprint);
 	$params->{'firewall-file'} = $firewall if -e $firewall;
 
+	$params->{'use-dirty-bitmap'} = JSON::true
+	    if $qemu_support->{'pbs-dirty-bitmap'};
+
 	$params->{timeout} = 60; # give some time to connect to the backup server
 
 	my $res = eval { mon_cmd($vmid, "backup", %$params) };
-- 
2.20.1