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

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Message-ID: <20181029024937.GC32606@ming.t460p>
Date:   Mon, 29 Oct 2018 10:49:38 +0800
From:   Ming Lei <ming.lei@...hat.com>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     axboe@...nel.dk, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2 1/3] blk-mq: refactor the code of issue request
 directly

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().

Thanks,
Ming