On Tue, Mar 01, 2011 at 12:48:34PM +0000, Stefan Hajnoczi wrote: > On Tue, Mar 01, 2011 at 01:42:54PM +0100, Christoph Hellwig wrote: > > I have patches to do that, and to allow changing O_DIRECT via a monitor > > command, but to toggle O_SYNC via fcntl I first need to get a kernel > > patch in as that's currently not allowed to be changed at runtime. > > Great it sounds like you have already implemented the two cases (guest wce and > host O_DIRECT) that we're talking about.
At least in theory. And for Linux I can add setting/clearing of O_SYNC via fcntl easily, but what do we do for other hosts? I'm not sure closing/reopening the backing file is easily feasible.
