From mboxrd@z Thu Jan  1 00:00:00 1970
From: Al Viro <viro@ZenIV.linux.org.uk>
Subject: Re: Rename a mountpoint (forcibly)?
Date: Thu, 2 May 2013 14:42:33 +0100
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To: Andy Lutomirski <luto@amacapital.net>
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On Tue, Apr 30, 2013 at 03:16:46PM -0700, Andy Lutomirski wrote:
> Is there a way to forcibly rename a mountpoint?  I can rename a
> directory that contains a mountpoint, but even if I bind-mount the
> underlying FS, I get EBUSY if I try to rename a mountpoint.  This is
> annoying -- I want to replace the entire contents of my root partition
> by moving the old contents away and moving replacements in, but the
> mountpoints get in the way.
> 
> Yes, this is evil, but it seems like the kernel is unnecessarily
> preventing my from shooting myself in the foot, and in this case the
> shot-in-the-foot is actually the desired effect.

POSIX, IIRC, and in this case it's really common practice.  As bfields
suggested, use mount --move.