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Date:      Sun, 10 Feb 2002 11:43:52 +0000 (GMT)
From:      Mike Silbersack <silby@silby.com>
To:        Guy Helmer <ghelmer@palisadesys.com>
Cc:        hackers@FreeBSD.ORG
Subject:   RE: nullfs and unionfs
Message-ID:  <20020210113701.S28078-100000@patrocles.silby.com>
In-Reply-To: <000001c1b24e$ffacea40$0200000a@spencer>

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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


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