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Date:   Wed, 9 Dec 2020 09:31:38 +0000
From:   Christoph Hellwig <hch@infradead.org>
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>,
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        "Darrick J. Wong" <darrick.wong@oracle.com>
Subject: Re: [PATCH v10 02/41] iomap: support REQ_OP_ZONE_APPEND
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Btw, another thing I noticed:

when using io_uring to submit a write to btrfs that ends up using Zone
Append we'll hit the

	if (WARN_ON_ONCE(is_bvec))
		return -EINVAL;

case in bio_iov_iter_get_pages with the changes in this series.