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Date:      Sat, 14 Feb 1998 04:59:15 +0100
From:      Tor Egge <Tor.Egge@idi.ntnu.no>
To:        wollman@khavrinen.lcs.mit.edu
Cc:        freebsd-bugs@hub.freebsd.org
Subject:   re: kern/1067: panic: ufs_lock: recursive lock not expected, pid: 27195
Message-ID:  <199802140359.EAA02579@pat.idi.ntnu.no>
In-Reply-To: Your message of "Fri, 13 Feb 1998 21:45:12 -0500 (EST)"
References:  <199802140245.VAA28222@khavrinen.lcs.mit.edu>

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> Gack.  I don't see any good reason for such a change (other than the
> dubious example of compatibility with Slowaris).  Mount points should
> not be treated any differently than any other directories.

Since MNT_UPDATE is implicit for "/" (which I did not notice when I
started writing my reply to kern/1067) and the "-a" option for the
mount command does not cause already-mounted filesystems to be mounted
again, you are correct.

Based upon the manual page and the system call implementation, I
mistakenly concluded that the change was useful in order to prevent
an accidental mount of a different file system at '/'. This is indeed
impossible using the mount command. Those using the mount system call
directly probably knows what they are doing.

Consider that part of the suggested fix withdrawn.

- Tor Egge

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