BIO_FLUSH on twe driver. Why is it not there?

[Artem Kuchin]

7-BETA1
gjournal complained that BIO_FLUSH is not supported by the driver. That is twe driver.
However, twe is working via scsi subsystem and the authour of  gjournal said somewhere that he
has had implemeneted BIO_FLISH for scsi and he specifically mentioned that he has tested twe and twa and they both support 
BIO_FLUSH.
Then why BIO_FLISH is not supported now?

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Regards,
Artem