On 09/11/2015 03:56, Fam Zheng wrote:
> +if (bs->drv && bs->drv->bdrv_drain) {
> +bs->drv->bdrv_drain(bs);
> +}
> +QLIST_FOREACH(child, >children, next) {
> +BlockDriverState *cbs = child->bs;
> +if (cbs->drv && cbs->drv->bdrv_drain) {
> +
On Mon, 11/09 10:24, Paolo Bonzini wrote:
>
>
> On 09/11/2015 03:56, Fam Zheng wrote:
> > +if (bs->drv && bs->drv->bdrv_drain) {
> > +bs->drv->bdrv_drain(bs);
> > +}
> > +QLIST_FOREACH(child, >children, next) {
> > +BlockDriverState *cbs = child->bs;
> > +if
Drivers can have internal request sources that generate IO, like the
need_check_timer in QED. Since we want quiesced periods that contain
nested event loops in block layer, we need to have a way to disable such
event sources.
Block drivers must implement the "bdrv_drain" callback if it has any
