Re: [Qemu-devel] [PATCH] Disk image shared and exclusive locks.

[Chris Webb]

Anthony Liguori <address@hidden> 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.

Cheers,

Chris.