linux-ext4 - Is labelling a mounted ext2/3/4 file system safe and supported?

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Date:   Mon, 26 Jul 2021 19:45:23 +0100
From:   Mike Fleetwood <mike.fleetwood@...glemail.com>
To:     linux-ext4@...r.kernel.org
Subject: Is labelling a mounted ext2/3/4 file system safe and supported?

Hi,

Using e2label to set a new label for a mounted ext4 seems to work, but
is it a safe and supported thing to do?

Google search doesn't seem to know.

Thanks,
Mike