'Fetch a list of all available disk offerings.
:rtype: ``list`` of :class:`CloudStackDiskOffering`'

def ex_list_disk_offerings(self):

    diskOfferings = []
    diskOfferResponse = self._sync_request(command='listDiskOfferings', method='GET')
    for diskOfferDict in diskOfferResponse.get('diskoffering', ()):
        diskOfferings.append(CloudStackDiskOffering(id=diskOfferDict['id'], name=diskOfferDict['name'], size=diskOfferDict['disksize'], customizable=diskOfferDict['iscustomized']))
    return diskOfferings
