On Thu, Nov 08, 2018 at 12:03:41AM +0800, Ming Lei wrote: > On Wed, Nov 7, 2018 at 11:47 PM Keith Busch <keith.busch@xxxxxxxxx> wrote: > > > > On Wed, Nov 07, 2018 at 11:44:59PM +0800, Ming Lei wrote: > > > blk_update_request() may tell us how much progress made, :-) > > > > Except when it doesn't, which is 100% of the time for many block > > drivers, including nvme. > > Please look at blk_mq_end_request()(<- nvme_complete_rq()), which > calls blk_update_request(). Huh? That just says 100% of the request size was transerred no matter what was actually transferred. The protocol doesn't have a way to express what transfer size occured with a command's completion, and even it did, there's no way I'd trust every firmware not to screw it.
