On 09/11/2015 03:56, Fam Zheng wrote:
> + if (bs->drv && bs->drv->bdrv_drain) {
> + bs->drv->bdrv_drain(bs);
> + }
> + QLIST_FOREACH(child, &bs->children, next) {
> + BlockDriverState *cbs = child->bs;
> + if (cbs->drv && cbs->drv->bdrv_drain) {
> + cbs->drv->bdrv_drain(bs);
> + }
> + }
I think this is not enough, because the children could have children as
well.
Perhaps you can do it like bdrv_flush: one function does the call to
bdrv_drain and the recursion on children; bdrv_drain calls that one
function and then does the "while (busy)" loop.
Paolo
