Re: [PATCH V2 1/3] blk-mq: refactor the code of issue request directly

From: Ming Lei
Date: Sun Oct 28 2018 - 22:50:06 EST

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