On 09/26/2016 11:33 AM, Mike Snitzer wrote:

On Mon, Sep 26 2016 at  2:25pm -0400,
Bart Van Assche [off-list ref] wrote:

quoted

Hello Jens,

Multiple block drivers need the functionality to stop a request
queue and to wait until all ongoing request_fn() / queue_rq() calls
have finished without waiting until all outstanding requests have
finished. Hence this patch series that introduces the
blk_quiesce_queue() and blk_resume_queue() functions. The dm-mq, SRP
and nvme patches in this patch series are three examples of where
these functions are useful. These patches apply on top of the
September 21 version of your for-4.9/block branch. The individual
patches in this series are:

0001-blk-mq-Introduce-blk_mq_queue_stopped.patch
0002-dm-Fix-a-race-condition-related-to-stopping-and-star.patch
0003-RFC-nvme-Use-BLK_MQ_S_STOPPED-instead-of-QUEUE_FLAG_.patch
0004-block-Move-blk_freeze_queue-and-blk_unfreeze_queue-c.patch
0005-block-Extend-blk_freeze_queue_start-to-the-non-blk-m.patch
0006-block-Rename-mq_freeze_wq-and-mq_freeze_depth.patch
0007-blk-mq-Introduce-blk_quiesce_queue-and-blk_resume_qu.patch
0008-SRP-transport-Port-srp_wait_for_queuecommand-to-scsi.patch
0009-RFC-nvme-Fix-a-race-condition.patch

Hi Bart,

How much testing has this series seen?  Did you run it against the
mptest testsuite? https://github.com/snitm/mptest

I did notice patch 2 should come after patch 7 (not sure if other
patches are out of order).

Hello Mike,

Regarding testing: I have primarily used my srp-test regression test 
suite to test this patch series because that test suite uncovered a 
dm-mq race that was not discovered by mptest. I'm currently running 
xfstests (to verify an ib_srp change that is not in this patch series) 
and will run mptest next.

You are right that patch 2 should come after patch 7. The order of the 
other patches in this series should be fine.

Bart.