Skip site navigation (1)Skip section navigation (2)
Date:      Sun, 10 Feb 2002 11:43:52 +0000 (GMT)
From:      Mike Silbersack <>
To:        Guy Helmer <>
Cc:        hackers@FreeBSD.ORG
Subject:   RE: nullfs and unionfs
Message-ID:  <>
In-Reply-To: <000001c1b24e$ffacea40$0200000a@spencer>

Next in thread | Previous in thread | Raw E-Mail | Index | Archive | Help

On Sun, 10 Feb 2002, Guy Helmer wrote:

> It looks like there are still some serious problems with this.  I just
> tried a similar thing on FreeBSD 4.4 and 4.5.  I created a directory of
> binaries to use for multiple jails, then null-mounted (read-only) the
> binaries for each of the jails to use.  To allow the /etc and other
> parts of the jails to be written, I union-mounted a per-jail writeable
> filesystem over each of the null mounts.  It seemed to work well until
> my jail setup program actually started a binary from inside the jail
> (i.e., from the null mount) when the kernel panic'ed with trap 12.
> Guy Helmer
> Palisade Systems, Inc.

If I'm not mistaken, nullfs had been fixed significantly in -current, but
the changes were not MFC'd... I'm not entirely sure on this, you might
wish to consult cvsweb to verify what has / has not been merged.

Mike "Silby" Silbersack

To Unsubscribe: send mail to
with "unsubscribe freebsd-hackers" in the body of the message

Want to link to this message? Use this URL: <>