vtbd0: hard error cmd=flush fsbn 0

[Nikos Vassiliadis]

Hi,

I am seeing this message on 8 and 9 branches running on bhyve 
(10.1-PRERELEASE #0 r274515). Does this just mean that bio_flush is not 
supported? or is it something to check further?

> vtbd0: hard error cmd=flush fsbn 0
> GEOM_JOURNAL: BIO_FLUSH not supported by vtbd0s1a.

Thanks, Nikos