From owner-freebsd-hackers@FreeBSD.ORG  Tue Jun 10 00:53:55 2008
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From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: freebsd-hackers@freebsd.org
References: <7d6fde3d0806090134u1c46c9f3gbeed3fb303876338@mail.gmail.com>
Date: Tue, 10 Jun 2008 03:53:41 +0300
In-Reply-To: <7d6fde3d0806090134u1c46c9f3gbeed3fb303876338@mail.gmail.com>
	(Garrett Cooper's message of "Mon, 9 Jun 2008 01:34:19 -0700")
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Subject: Re: Bug by design in getfsfile(3) / needed sanity check for
	mountpoints
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On Mon, 9 Jun 2008 01:34:19 -0700, "Garrett Cooper" <yanefbsd@gmail.com> wrote:
> Hi hackers,
>       I have a question, pending a bug found in getfsfile(3) [1].
>       Is there any possibility where a mountpoint be any value other
> than a directory, a symlink, or "none", i.e. a flat file?
> Thanks,
> -Garrett
>
> References:
> http://www.freebsd.org/cgi/query-pr.cgi?pr=bin/124409 (not fully in PR
> database yet).

It looks like could be 'fixed' by using realpath() on its argument.
Then this should work fine:

    # fsck /usr/