api: disks: create: re-check disk after fork/lock

Because then it might not be unused anymore. If there really is a
race, this prevents e.g. sgdisk creating a partition on a device
already in use by LVM or LVM destroying a partitioned device.

For ZFS, also get the latest udev info once inside the worker.

Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>

PVE/API2/Disks/Directory.pm

@@ -212,6 +212,8 @@ __PACKAGE__->register_method ({
 	    my $mountunitpath = "/etc/systemd/system/$mountunitname";
 
 	    PVE::Diskmanage::locked_disk_action(sub {
+		PVE::Diskmanage::assert_disk_unused($dev);
+
 		# create partition
 		my $cmd = [$SGDISK, '-n1', '-t1:8300', $dev];
 		print "# ", join(' ', @$cmd), "\n";