Get all Volumes associated with the current credentials.

        :type volume_ids: list
        :param volume_ids: Optional list of volume ids.  If this list
                           is present, only the volumes associated with
                           these volume ids will be returned.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

        :rtype: list of :class:`boto.ec2.volume.Volume`
        :return: The requested Volume objects

def get_all_volumes(self, volume_ids=None, filters=None):
        """
        Get all Volumes associated with the current credentials.

        :type volume_ids: list
        :param volume_ids: Optional list of volume ids.  If this list
                           is present, only the volumes associated with
                           these volume ids will be returned.

        :type filters: dict
        :param filters: Optional filters that can be used to limit
                        the results returned.  Filters are provided
                        in the form of a dictionary consisting of
                        filter names as the key and filter values
                        as the value.  The set of allowable filter
                        names/values is dependent on the request
                        being performed.  Check the EC2 API guide
                        for details.

        :rtype: list of :class:`boto.ec2.volume.Volume`
        :return: The requested Volume objects
        """
        params = {}
        if volume_ids:
            self.build_list_params(params, volume_ids, 'VolumeId')
        if filters:
            self.build_filter_params(params, filters)
        return self.get_list('DescribeVolumes', params,
                             [('item', Volume)], verb='POST')