Il 12/04/2013 12:04, Kevin Wolf ha scritto: > Or actually, if you want to avoid .bdrv_drain for now, the patch that I > started when I thought a bit about this, had a default .bdrv_drain > implementation that just forwarded the request to bs->file if it wasn't > implemented by a block driver. For the QED case, this would work.
It's similar to bdrv_co_flush. Drain bs first, then bs->backing_hd (this is not needed in bdrv_co_flush), then bs->file, then the driver can do it on other files. Paolo
