From owner-freebsd-arch  Wed Jun 28 10:25:15 2000
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Date: Wed, 28 Jun 2000 10:25:01 -0700
From: Alfred Perlstein <bright@wintelcom.net>
To: Dag-Erling Smorgrav <des@flood.ping.uio.no>
Cc: Jesper Skriver <jesper@skriver.dk>,
	Cy Schubert - ITSD Open Systems Group <Cy.Schubert@uumail.gov.bc.ca>,
	freebsd-arch@FreeBSD.ORG
Subject: Re: Soft updates mount change (17 Jun)
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References: <200006272212.PAA36120@passer.osg.gov.bc.ca> <20000628094841.D77839@skriver.dk> <xzphfadyh9o.fsf@flood.ping.uio.no> <20000628091509.V275@fw.wintelcom.net> <xzpzoo5wz6l.fsf@flood.ping.uio.no>
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* Dag-Erling Smorgrav <des@flood.ping.uio.no> [000628 09:25] wrote:
> Alfred Perlstein <bright@wintelcom.net> writes:
> > * Dag-Erling Smorgrav <des@flood.ping.uio.no> [000628 08:11] wrote:
> > > s/week/year/. This has been discussed many times, and while the
> > > current solution (fs flag) is not particularly elegant, it is the
> > > lesser evil.
> > IMO there's nothing wrong with mount doing what tunefs does, setting
> > the softdep bit before actually mounting it, changing it while
> > mounted would not be supported.
> 
> If you use a filesystem marked for softupdates on a non-SU system, and
> have a crash, fsck will go nuts and spew gobs of "UNEXPECTED
> SOFTUPDATES INCONSISTENCY" messages.

Then when mounted without the softdep option it would have to clear
the softdep bit before mounting read/write.

I'm not talking about anything particularly tricky here, it's just
tweaking the userland side of mount to possibly just spawn tunefs.
Another interesting tweak would be adding the linux -loopback option
to get mount to attempt to autoconfigure a vn device.

-Alfred


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