code: func (c *StorageGateway) DescribeWorkingStorage(input *DescribeWorkingStorageInput) (*DescribeWorkingStorageOutput, error) {
  	req, out := c.DescribeWorkingStorageRequest(input)
  	return out, req.Send()
  }
docs: // DescribeWorkingStorage API operation for AWS Storage Gateway.
  //
  // Returns information about the working storage of a gateway. This operation
  // is only supported in the stored volumes gateway type. This operation is deprecated
  // in cached volumes API version (20120630). Use DescribeUploadBuffer instead.
  //
  // Working storage is also referred to as upload buffer. You can also use the
  // DescribeUploadBuffer operation to add upload buffer to a stored volume gateway.
  //
  // The response includes disk IDs that are configured as working storage, and
  // it includes the amount of working storage allocated and used.
  //
  // Returns awserr.Error for service API and SDK errors. Use runtime type assertions
  // with awserr.Error's Code and Message methods to get detailed information about
  // the error.
  //
  // See the AWS API reference guide for AWS Storage Gateway's
  // API operation DescribeWorkingStorage for usage and error information.
  //
  // Returned Error Codes:
  //   * ErrCodeInvalidGatewayRequestException "InvalidGatewayRequestException"
  //   An exception occurred because an invalid gateway request was issued to the
  //   service. For more information, see the error and message fields.
  //
  //   * ErrCodeInternalServerError "InternalServerError"
  //   An internal server error has occurred during the request. For more information,
  //   see the error and message fields.
  //
  // See also, https://docs.aws.amazon.com/goto/WebAPI/storagegateway-2013-06-30/DescribeWorkingStorage