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From: Daniel Phillips <phillips@bonn-fries.net>
To: Hans Reiser <reiser@namesys.com>
Subject: Re: ReiserFS / 2.4.6 / Data Corruption
Date: Fri, 27 Jul 2001 18:30:22 +0200
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Cc: Joshua Schmidlkofer <menion@srci.iwpsd.org>,
        kernel <linux-kernel@vger.kernel.org>, Chris Mason <mason@suse.com>
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On Friday 27 July 2001 17:33, Hans Reiser wrote:
> Daniel Phillips wrote:
> > On Friday 27 July 2001 16:18, Joshua Schmidlkofer wrote:
> > > I've almost quit using reiser, because everytime I have a power
> > > outage, the last 2 or three files that I've editted, even ones
> > > that I haven't touched in a while, will usually be hopelessly
> > > corrupted.
> >
> > My early flush patch will fix this, or at least it will if I get
> > together with the ReiserFS guys and figure out how to integrate
> > their flushing mechanism with the standard bdflush.  Or they could
> > incorporate the ideas from my early flush in their own flush
> > daemon, though generalizing the standard flush would have more
> > value in the long run.
>
> Can you describe early flush?

The idea is to do what amounts to a sync within a tenth of a second of 
disk bandwidth usage falling below a certain threshhold.

The original posts/patches are here:

    [RFC] Early flush (was: spindown)
    [RFC] Early flush: new, improved (updated)

and there are long threads attached to each of them.  The clearest 
explanation is probably Jonathan Corbet's writeup on lwn:

   http://lwn.net/2001/0628/kernel.php3

(Thanks, Jonathan, I often get the feeling I understand what I actually 
did only *after* reading your writeups:-)

The second of the two patches needs more work - I think I goofed on 
some needed "volatile" handling, see the current flam^H^H^H^H thread 
about that.

--
Daniel
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