On Mon, Nov 26, 2018 at 04:19:36PM -0500, Dennis Zhou wrote: > There are several scenarios where blkg_lookup_create() can fail such as > the blkcg dying, request_queue is dying, or simply being OOM. Most > handle this by simply falling back to the q->root_blkg and calling it a > day. > > This patch implements the notion of closest blkg. During > blkg_lookup_create(), if it fails to create, return the closest blkg > found or the q->root_blkg. blkg_try_get_closest() is introduced and used > during association so a bio is always attached to a blkg. > > Signed-off-by: Dennis Zhou <dennis@xxxxxxxxxx> > Acked-by: Tejun Heo <tj@xxxxxxxxxx> Reviewed-by: Josef Bacik <josef@xxxxxxxxxxxxxx> Thanks, Josef
