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Date: Wed, 16 Mar 2016 14:25:16 +0000
From: Al Viro <viro@ZenIV.linux.org.uk>
To: Jordi Pujol Palomer <jordipujolp@gmail.com>
Cc: Linux-Fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [PATCH] fs/namei.c: Hard link and rename should check same
 device instead of same mount
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On Wed, Mar 16, 2016 at 02:05:14PM +0100, Jordi Pujol Palomer wrote:
> Hello,
> 
> Working on a Linux system that bind mounts some
> directories, have found frequent errors when moving files between
> directories that belong to different mount points but are on the same
> device.

> The two attached patches solve these problems on a local filesystem.
> Maybe we must test it on different configurations.
 
NAK.  This is absolutely deliberate; moreover, mount --bind $DIR $DIR
is often used just to set such a boundary.