linux-kernel - mount --move and shared namespaces

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Date:	Mon, 9 May 2016 18:46:02 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: mount --move and shared namespaces

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It seems that mount --move does not work on a shared namespace ( now
the default under systemd ), yet you can mount --bind and then umount
the original, which seems to amount to exactly the same thing.  Why is
the direct move not allowed?
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