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Date:   Wed, 29 Jun 2022 09:22:39 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc:     Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
        linux-block@vger.kernel.org
Subject: Re: [PATCH 1/2] block: move ->ia_ranges from the request_queue to
 the gendisk
Message-ID: <20220629072239.GA20215@lst.de>
References: <20220629062013.1331068-1-hch@lst.de> <20220629062013.1331068-2-hch@lst.de> <36d397c2-3cfd-4872-1baa-f375d50aa6ba@opensource.wdc.com>
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On Wed, Jun 29, 2022 at 04:08:29PM +0900, Damien Le Moal wrote:
> On 6/29/22 15:20, Christoph Hellwig wrote:
> > Independent access ranges only matter for file system I/O and are only
> > valid with a registered gendisk, so move them there.
> 
> Would this potentially affect the use of ranges in DM ? E.g. exposing a
> dm-linear device targets as ranges. I do not think so but I did not check
> the details.

Device mapper only ever does file system I/O.  Passthrough I/O must
be initiated by the actual driver like scsi or nvme.