linux-kernel - Re: Linux 2.6.29

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Message-ID: <20090331184517.GA25879@logfs.org>
Date:	Tue, 31 Mar 2009 20:45:17 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Mark Lord <lkml@....ca>,
	Stefan Richter <stefanr@...6.in-berlin.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Theodore Tso <tytso@....edu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rees <drees76@...il.com>, Jesper Krogh <jesper@...gh.cc>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: Linux 2.6.29

On Sat, 28 March 2009 21:18:51 -0400, Jeff Garzik wrote:
> 
> Was the BSD soft-updates idea of FS data-before-metadata a good one? 
> Yes.  Obviously.
> 
> It is the cornerstone of every SANE journalling-esque database or 
> filesystem out there -- don't leave a window where your metadata is 
> inconsistent.  "Duh" :)

Your idea of 'consistent' seems a bit fuzzy.  Soft updates, afaiu, leave
plenty of windows and reasons to run fsck.  They only guarantee that all
those windows result in lost space - data allocations without any
references.  It certainly prevents the worst problems, but I would use a
different word for it. :)

Jörn

-- 
Don't worry about people stealing your ideas. If your ideas are any good,
you'll have to ram them down people's throats.
-- Howard Aiken quoted by Ken Iverson quoted by Jim Horning quoted by
   Raph Levien, 1979
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