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Date:   Wed, 26 Jan 2022 09:49:50 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Ming Lei <ming.lei@redhat.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        "Martin K . Petersen" <martin.petersen@oracle.com>,
        linux-block@vger.kernel.org, linux-nvme@lists.infradead.org,
        linux-scsi@vger.kernel.org
Subject: Re: [PATCH V2 05/13] block: only account passthrough IO from
 userspace
Message-ID: <20220126084950.GA23957@lst.de>
References: <20220122111054.1126146-6-ming.lei@redhat.com> <20220124130555.GD27269@lst.de> <Ye8xleeYZfmwA3D7@T590> <20220125061634.GA26495@lst.de> <20220125071906.GA27674@lst.de> <Ye++VmBkg0I8Lq8+@T590> <20220126055003.GA21089@lst.de> <YfD2YNRf+lhe5BcU@T590> <20220126081052.GA23154@lst.de> <YfEHcs6psrBqFu3l@T590>
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On Wed, Jan 26, 2022 at 04:33:54PM +0800, Ming Lei wrote:
> > I guess you are worried about the latter conditionin that we stop
> > accounting for no data transfer passthrough commands?
> 
> No, I meant that bio->bi_bdev isn't setup yet for passthrough request,
> and not sure that can be done easily.

Take a look at e.g. nvme_submit_user_cmd and iblock_get_bio.