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Date:   Tue, 21 Mar 2023 10:09:08 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Damien Le Moal <damien.lemoal@opensource.wdc.com>
Cc:     Ming Lei <ming.lei@redhat.com>,
        Bart Van Assche <bvanassche@acm.org>,
        Jens Axboe <axboe@kernel.dk>, linux-block@vger.kernel.org,
        Jaegeuk Kim <jaegeuk@kernel.org>,
        Christoph Hellwig <hch@lst.de>, Jan Kara <jack@suse.cz>,
        Johannes Thumshirn <johannes.thumshirn@wdc.com>
Subject: Re: [PATCH 2/2] block: Split and submit bios in LBA order
Message-ID: <20230321090908.GA27216@lst.de>
References: <ZBT6EmhEfJmgRXU1@ovpn-8-18.pek2.redhat.com> <580e712c-5e43-e1a5-277b-c4e8c50485f0@acm.org> <ZBjsDy2pfPk9t6qB@ovpn-8-29.pek2.redhat.com> <50dfa89c-19fa-b655-f6b8-b8853b066c75@acm.org> <ZBj99Oy5FPDI+Gdn@ovpn-8-18.pek2.redhat.com> <a9347617-70b3-3cc1-ea5e-c6bd78c29acd@opensource.wdc.com> <ZBkTwV7UC5QDtRyj@ovpn-8-18.pek2.redhat.com> <9c74df25-aa99-afc2-4f40-3201dd67368e@opensource.wdc.com> <ZBlkF7zjQyahk5gv@ovpn-8-18.pek2.redhat.com> <cbf73fed-265f-b244-608c-bfcf5c1b6d4d@opensource.wdc.com>
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On Tue, Mar 21, 2023 at 05:51:29PM +0900, Damien Le Moal wrote:
> Interesting. We have never seen such issue in practice with the device mappers
> that support zoned devices. But it seems interesting to try to find a use case
> that could trigger this. Will look into it, and if everything is fixed, it would
> still be a good regression test for blocktest.

I think it requires a non-zoneappend bio that is large enough to
require splitting and which goes through a remapper.