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Date:   Wed, 23 Dec 2020 08:19:47 +0000
From:   Christoph Hellwig <hch@infradead.org>
To:     Josef Bacik <josef@toxicpanda.com>
Cc:     linux-btrfs@vger.kernel.org, kernel-team@fb.com
Subject: Re: [PATCH 0/4] Introduce a mmap sem to deal with some mmap issues
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On Mon, Dec 14, 2020 at 01:19:37PM -0500, Josef Bacik wrote:
> These issues exist for remap and fallocate, so add an i_mmap_sem to allow us to
> disallow mmap in these cases.  I'm still waiting on xfstests to finish with
> this, but 2 hours in and no lockdep or deadlocks.  Thanks,

Any chance you could look into lifting it to the VFS and also convert
ext4 and XFS to the common scheme?