linux-kernel - Re: [PATCH 1/5] blk-mq: add API to get hctx index from request

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Date:   Thu, 28 Jun 2018 15:19:28 -0600
From:   Keith Busch <keith.busch@...ux.intel.com>
To:     Bart Van Assche <bart.vanassche@....com>
Cc:     Keith Busch <keith.busch@...el.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Jens Axboe <axboe@...nel.dk>
Subject: Re: [PATCH 1/5] blk-mq: add API to get hctx index from request

On Thu, Jun 28, 2018 at 02:12:38PM -0700, Bart Van Assche wrote:
> Regarding the above patch: have you considered to use the existing function
> blk_mq_unique_tag_to_hwq() instead of introducing this new function?

Interesting. I think the usage I need using that is something like:

	blk_mq_unique_tag_to_hwq(blk_mq_unique_tag(req))

Sort of a round-about way to get to the hwq from the struct request,
but I'd rather not introduce anything new if there are other ways,
so thank you for the pointer.