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Normally, if there are partitions defined on top of device-mapper device, there should be a device-mapper device created for each partiton on top of the old one and once the underlying DM device is used by another devices (partition mappings in this case), it can't be used as a PV anymore. However, sometimes, it may happen the partition mappings are missing - either the partitioning tool is not creating them if it does not contain full support for device-mapper devices or the mappings were removed. Better safe than sorry - check for partition header on DM devs and filter them out as unsuitable for PVs in case the check is positive. Whatever the user is doing, let's do our best to prevent unwanted corruption (...by running pvcreate on top of such device that would corrupt the partition header).