nullfs distinct path check: take into account filesystems

[Kostik Belousov]

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.
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