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Date:   Wed, 25 Oct 2023 08:34:21 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Amir Goldstein <amir73il@gmail.com>
Cc:     Jan Kara <jack@suse.cz>, Christian Brauner <brauner@kernel.org>,
        Chris Mason <clm@fb.com>, Josef Bacik <josef@toxicpanda.com>,
        David Sterba <dsterba@suse.com>, linux-btrfs@vger.kernel.org,
        linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH 0/3] fanotify support for btrfs sub-volumes
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On Wed, Oct 25, 2023 at 04:50:45PM +0300, Amir Goldstein wrote:
> Jan,
> 
> This patch set implements your suggestion [1] for handling fanotify
> events for filesystems with non-uniform f_fsid.

File systems nust never report non-uniform fsids (or st_dev) for that
matter.  btrfs is simply broken here and needs to be fixed.