Hi Ming

On 10/29/18 10:49 AM, Ming Lei wrote:

On Sat, Oct 27, 2018 at 12:01:09AM +0800, Jianchao Wang wrote:

quoted

Merge blk_mq_try_issue_directly and __blk_mq_try_issue_directly
into one interface which is able to handle the return value from
.queue_rq callback. Due to we can only issue directly w/o io
scheduler, so remove the blk_mq_get_driver_tag.

It isn't correct for dm-rq, see blk_insert_cloned_request().

Yes, got it.
when the original requests are issued to the underlying paths as cloned
requests, they should not pass through the io scheduler.

Thanks
Jianchao