On Tue, Jun 13 2017, Ming Lei wrote:

On Tue, Jun 06, 2017 at 10:03:12AM -0600, Jens Axboe wrote:

quoted

On 06/06/2017 09:21 AM, Ming Lei wrote:

quoted

Hi,

There is one big issue in current blk_mq_quiesce_queue():

    - in case of direct issue or BLK_MQ_S_START_ON_RUN, dispatch won't
    be prevented after blk_mq_quiesce_queue() is returned.


The 1st two patches fix two problems in direct issue, please consider
it for v4.12.

The other 10 patches improves blk_mq_quiesce_queue(), and
make is easy to use, and avoid race between queue restart and
quiescing. These 10 patches should be for v4.13.

I've added 1-2 for 4.12, I'll review the rest for 4.13 when some
cycles free up.

Hi Jens,

If you are fine with 3-12, could you consider it for v4.13?

The fixes on uses of blk_mq_tagset_busy_iter() depends on
this patchset.

Yes, I think it looks fine. I've applied the rest, except the nvme
patch, which no longer applies since start/stop changes have been made
there. Please resend that one against for-4.13/block, thanks.

-- 
Jens Axboe