linux-kernel - Re: [dm-devel] [PATCH v4 00/13] support non power of 2 zoned devices

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Message-ID: <20220520171830.GR18596@twin.jikos.cz>
Date:   Fri, 20 May 2022 19:18:30 +0200
From:   David Sterba <dsterba@...e.cz>
To:     Pankaj Raghav <p.raghav@...sung.com>
Cc:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Javier González <javier.gonz@...sung.com>,
        Hannes Reinecke <hare@...e.de>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        Mike Snitzer <snitzer@...hat.com>,
        Christoph Hellwig <hch@....de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Theodore Ts'o <tytso@....edu>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "pankydev8@...il.com" <pankydev8@...il.com>,
        "gost.dev@...sung.com" <gost.dev@...sung.com>,
        "jiangbo.365@...edance.com" <jiangbo.365@...edance.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "dsterba@...e.com" <dsterba@...e.com>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Keith Busch <kbusch@...nel.org>,
        Adam Manzanares <a.manzanares@...sung.com>
Subject: Re: [dm-devel] [PATCH v4 00/13] support non power of 2 zoned devices

On Fri, May 20, 2022 at 11:30:09AM +0200, Pankaj Raghav wrote:
> On 5/20/22 08:41, Damien Le Moal wrote:
> >> Note that for F2FS there is no blocker. Jaegeuk picked the initial
> >> patches, and he agreed to add native support.
> > 
> > And until that is done, f2fs will not work with these new !po2 devices...
> > Having the new dm will avoid that support fragmentation which I personally
> > really dislike. With the new dm, we can keep support for *all* zoned block
> > devices, albeit needing a different setup depending on the device. That is
> > not nice at all but at least there is a way to make things work continuously.
> 
> I see that many people in the community feel it is better to target the
> dm layer for the initial support of npo2 devices. I can give it a shot
> and maintain a native out-of-tree support for FSs for npo2 devices and
> merge it upstream as we see fit later.

Some of the changes from your patchset are cleanups or abstracting the
alignment and zone calculations, so this can be merged to minimize the
out of tree code.