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Date:      Mon, 26 May 2003 23:51:49 -0700
From:      Kris Kennaway <kris@obsecurity.org>
To:        hackers@FreeBSD.org
Subject:   Re: Change request for mount_null manpage
Message-ID:  <20030527065149.GA84791@rot13.obsecurity.org>
In-Reply-To: <20030526055024.GN383@hal9000.halplant.com>
References:  <20030525145542.GA97711@LF.net> <20030526055024.GN383@hal9000.halplant.com>

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On Mon, May 26, 2003 at 01:50:24AM -0400, Andrew J Caines wrote:
> Marc,
>=20
> > I'm using mount_null now for some months - and i never had a problem wi=
th this.
>=20
> Are you using it for rw mounts and if so, then what kind or write volume
> and sizes do you handle?
>=20
> Usually when this comes up, folks are using null ro mounts and the rare
> (and sometime unintentional) rw mounts do little or no writing. If anyone
> is doing significant volume or size writes, then I've not heared mention
> of it.

nullfs may well work for some r/o workloads, but it is definitely
broken for rw mounts.  If anyone is seriously interested in fixing it,
I can describe the usage pattern that causes a reliable deadlock on my
machine (I've reported it before).

Kris

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