nullfs distinct path check: take into account filesystems

[Kostik Belousov]

On Wed, Jun 02, 2010 at 05:58:56PM +0300, Kostik Belousov wrote:
> On Mon, May 31, 2010 at 07:54:24PM +0300, Andriy Gapon wrote:
> > 
> > Right now mount_nullfs doesn't allow to, for example, mount / in
> > /tmp/somedir even if /tmp is a different filesystem. I think there is
> > no reason to do that and thus propose the following patch.
> 
> Reason is that after such mount "find /" would never end.

Hm, "different filesystems". Sorry, ignore my answer.
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