Paul Brook wrote:
> > That'll depend on what kind of device is emulated. Does the SCSI
> > emulation handle multiple in-flight commands with any guarantee on
> > order?
> SCSI definitely allows (and we emulate) multiple in flight commands.
> I can't find any requirement that writes must complete before a
> subsequent SYNCHRONISE_CACHE. However I don't claim to know the spec
> that well,
Aren't there SCSI tagged barrier commands or something like that,
which allow a host to request ordering between commands?
> it's probably not a bad idea have them complete anyway. Preferably
> this would be a completely asynchronous operation. i.e. the sync
> command returns immediately, but only completes when all preceding
> writes have completed and been flushed to disk.
I agree, that seems the optimal implementation.