linux-kernel - Re: [PATCH v15 11/13] dm: call dm_zone_endio after the target endio callback for zoned devices

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Date:   Wed, 28 Sep 2022 11:13:28 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Pankaj Raghav <p.raghav@...sung.com>, snitzer@...nel.org,
        axboe@...nel.dk, agk@...hat.com, hch@....de,
        damien.lemoal@...nsource.wdc.com
Cc:     jaegeuk@...nel.org, gost.dev@...sung.com,
        linux-kernel@...r.kernel.org, hare@...e.de,
        matias.bjorling@....com, Johannes.Thumshirn@....com,
        linux-block@...r.kernel.org, linux-nvme@...ts.infradead.org,
        pankydev8@...il.com, dm-devel@...hat.com
Subject: Re: [PATCH v15 11/13] dm: call dm_zone_endio after the target endio
 callback for zoned devices

On 9/23/22 10:36, Pankaj Raghav wrote:
> dm_zone_endio() updates the bi_sector of orig bio for zoned devices that
> uses either native append or append emulation, and it is called before the
> endio of the target. But target endio can still update the clone bio
> after dm_zone_endio is called, thereby, the orig bio does not contain
> the updated information anymore.
> 
> Currently, this is not a problem as the targets that support zoned devices
> such as dm-zoned, dm-linear, and dm-crypt do not have an endio function,
> and even if they do (such as dm-flakey), they don't modify the
> bio->bi_iter.bi_sector of the cloned bio that is used to update the
> orig_bio's bi_sector in dm_zone_endio function.
> 
> This is a prep patch for the new dm-po2zoned target as it modifies
> bi_sector in the endio callback.
> 
> Call dm_zone_endio for zoned devices after calling the target's endio
> function.

Reviewed-by: Bart Van Assche <bvanassche@....org>