Date: Sun, 11 Feb 2001 06:01:09 -0800 From: Peter Wemm <peter@netplex.com.au> To: Stefan Esser <se@FreeBSD.org> Cc: Poul-Henning Kamp <phk@critter.freebsd.dk>, Maxime Henrion <mux@qualys.com>, freebsd-hackers@FreeBSD.org, Matt Dillon <dillon@earth.backplane.com>, Greg Black <gjb@gbch.net>, FreeBSD-Audit@FreeBSD.org Subject: Re: [Patches] mount -o softdep (was: Re: soft updates and qmail (RE: qmail IO problems)) Message-ID: <200102111401.f1BE19U36962@mobile.wemm.org> In-Reply-To: <20010211132031.A1735@StefanEsser.FreeBSD.org>
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Stefan Esser wrote:
> On 2001-02-07 05:20 -0800, Peter Wemm <peter@netplex.com.au> wrote:
> [ Follow-ups to the FreeBSD-Audit mail list only, please ... ]
> > Poul-Henning Kamp wrote:
> > > In message <200102071312.f17DCHt59672@mobile.wemm.org>, Peter Wemm writes
:
> > > >So that fsck(8) can see what mode the FS *was* mounted in last time. Tha
t
> > > >bears no relationship to fstab or the current options.
> > >
> > > Right, so if mounting in softupdates mode updates the superblock to
> > > set the softupdates flag, why wouldn't that work ?
> >
> > It would work fine, but Kirk told me not to bother submitting patches
> > because he had something else in mind (or at least, that's the way I
> > interpreted the mail).
>
> I created patches that do just that (mount -o softdep performs
> a soft-updates mount and updates the superblock softdep flag)
> back in June 2000 and sent them to Kirk, who then agreed that
> this was the way to go, when the problems with memory and disk
> resource usage of soft-updates writes were solved (the missing
> limits on the amount of dirty buffers and the delayed freeing
> of disk blocks after a file is removed). Both of these points
> seem to have been resolved, meanwhile, and I do not see any
> reason, not to enable soft-updates by default and to provide a
> mount option that disables soft-updates per filesystem.
>
> ( For reference, see the FreeBSD-Arch archive for the full message:
>
> Message-Id: <200006282051.NAA05776@beastie.mckusick.com>
> To: arch@freebsd.org
> Subject: Re: Soft updates mount change
> Cc: Stefan Esser <se@freebsd.org>
> Date: Wed, 28 Jun 2000 13:51:00 -0700
> From: Kirk McKusick <mckusick@mckusick.com>
>
> That message includes my mail to Kirk, where I describe the
> diffs and my reasoning, why it should be done that way ... )
>
> The following diffs are patches to all components (kernel, mount
> programs) except for the required additions to the mount_ufs man
> page.
>
> I have been running a patched kernel on sevreal systems for more
> than a half year with no problems at all ...
>
> Regards, STefan
I like this a lot! It is exactly what we need.
Cheers,
-Peter
--
Peter Wemm - peter@FreeBSD.org; peter@yahoo-inc.com; peter@netplex.com.au
"All of this is for nothing if we don't go to the stars" - JMS/B5
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