linux-ext4 - Remount with journal

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Date:   Sun, 27 May 2018 23:42:54 +0200
From:   Niklas Hambüchen <mail@....me>
To:     linux-ext4@...r.kernel.org
Subject: Remount with journal_path option in fstab

I'm using ext4 with external journal on Linux 4.9.

For being explicit I would like to set the journal_path=/dev/... option in /etc/fstab.

However when I do so, then some OS scripts fail.
This is because `systemd-remount-fs` calls `mount / -o remount`, which fails with

  EXT4-fs (md126): Cannot specify journal on remount

(How) is this supposed to work? Can `journal_path` be given in fstab?

Also, should it really fail with `Cannot specify journal on remount` even when the journal given is the one that is already being used?

Thanks for your insights!