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Date:   Fri, 27 Nov 2020 20:28:08 +0100
From:   David Sterba <dsterba@suse.cz>
To:     Naohiro Aota <naohiro.aota@wdc.com>
Cc:     linux-btrfs@vger.kernel.org, dsterba@suse.com, hare@suse.com,
        linux-fsdevel@vger.kernel.org, Jens Axboe <axboe@kernel.dk>,
        Christoph Hellwig <hch@infradead.org>,
        "Darrick J. Wong" <darrick.wong@oracle.com>
Subject: Re: [PATCH v10 00/41] btrfs: zoned block device support
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On Tue, Nov 10, 2020 at 08:26:03PM +0900, Naohiro Aota wrote:
> Johannes Thumshirn (1):
>   block: add bio_add_zone_append_page
> 
> Naohiro Aota (40):
>   iomap: support REQ_OP_ZONE_APPEND

>From that one

>   btrfs: introduce ZONED feature flag
>   btrfs: get zone information of zoned block devices
>   btrfs: check and enable ZONED mode
>   btrfs: introduce max_zone_append_size
>   btrfs: disallow space_cache in ZONED mode
>   btrfs: disallow NODATACOW in ZONED mode
>   btrfs: disable fallocate in ZONED mode
>   btrfs: disallow mixed-bg in ZONED mode
>   btrfs: implement log-structured superblock for ZONED mode

up to this patch added to misc-next. There's still open question
regarding the superblock copies, we had a chat about that with Johanness
so he'll tell you more.