Chris Webb wrote:
Anthony Liguori <anth...@codemonkey.ws> writes:
I've resisted this because I'm concerned that if we delay the
opening of the file on the destination, it could fail. That's a
very late failure and that makes me uncomfortable as just a work
around for NFS.
I don't know much about NFS's semantics with cache-coherency, but I take it
there isn't some sort of synchronisation operation that works on a file
descriptor and could be done instead as the vm starts and stops to avoid
having to delay the open itself? I agree with you that failing this late
could make for some rather nasty behaviour compared to the current version.
I think this is a case of spec vs. in practice. By the NFS spec,
coherence is only guaranteed as close-after-open. Let me poke around
and see if I can find anyone with better info.
Regards,
Anthony Liguori
Cheers,
Chris.
