linux-kernel - Re: [PATCH AUTOSEL 5.8 11/42] nvme: skip noiob for zoned devices

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Message-ID: <20200831153818.GA83475@C02WT3WMHTD6>
Date:   Mon, 31 Aug 2020 09:38:18 -0600
From:   Keith Busch <kbusch@...nel.org>
To:     Sasha Levin <sashal@...nel.org>
Cc:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Sagi Grimberg <sagi@...mberg.me>, Jens Axboe <axboe@...nel.dk>,
        linux-nvme@...ts.infradead.org
Subject: Re: [PATCH AUTOSEL 5.8 11/42] nvme: skip noiob for zoned devices

On Mon, Aug 31, 2020 at 11:29:03AM -0400, Sasha Levin wrote:
> From: Keith Busch <kbusch@...nel.org>
> 
> [ Upstream commit c41ad98bebb8f4f0335b3c50dbb7583a6149dce4 ]
> 
> Zoned block devices reuse the chunk_sectors queue limit to define zone
> boundaries. If a such a device happens to also report an optimal
> boundary, do not use that to define the chunk_sectors as that may
> intermittently interfere with io splitting and zone size queries.
> 
> Signed-off-by: Keith Busch <kbusch@...nel.org>
> Signed-off-by: Sagi Grimberg <sagi@...mberg.me>
> Signed-off-by: Jens Axboe <axboe@...nel.dk>
> Signed-off-by: Sasha Levin <sashal@...nel.org>

You can safely drop this from stable: nvme zoned devices were only introduced
to linux in 5.9.