[dm-devel] [PATCH v5] blk-mq: introduce BLK_STS_DEV_RESOURCE

[Mike Snitzer]

On Tue, Jan 30 2018 at  2:42pm -0500,
Bart Van Assche <Bart.VanAssche at wdc.com> wrote:

> On Tue, 2018-01-30 at 14:33 -0500, Mike Snitzer wrote:
> > On Tue, Jan 30 2018 at 12:52pm -0500,
> > Bart Van Assche <bart.vanassche at wdc.com> wrote:
> > 
> > > - This patch does not fix any bugs nor makes block drivers easier to
> > >   read or to implement. So why is this patch considered useful?
> > 
> > It enables blk-mq core to own the problem that individual drivers should
> > have no business needing to worry about.  Period.
> 
> Thanks for having confirmed that this patch is an API-change only and does
> not fix any bugs.

No, it is an API change that enables blk-mq drivers to make forward
progress without compromising the potential benefits associated with
blk-mq's SCHED_RESTART functionality.

(If we're going to beat this horse to death it might as well be with
precision)