linux-kernel - Re: [PATCH][RFC] fast file mapping for loop

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Message-ID: <20080110090125.GU6258@kernel.dk>
Date:	Thu, 10 Jan 2008 10:01:25 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	linux-kernel@...r.kernel.org, chris.mason@...cle.com,
	linux-fsdevel@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH][RFC] fast file mapping for loop

On Thu, Jan 10 2008, Christoph Hellwig wrote:
> On Thu, Jan 10, 2008 at 09:44:57AM +0100, Jens Axboe wrote:
> > > IMHO this shouldn't be done in the loop driver anyway.  Filesystems have
> > > their own effricient extent lookup trees (well, at least xfs and btrfs
> > > do), and we should leverage that instead of reinventing it.
> > 
> > Completely agree, it's just needed right now for this solution since all
> > we have is a crappy bmap() interface to get at those mappings.
> 
> So let's fix the interface instead of piling crap ontop of it.  As I
> said I think Peter has something to start with so let's beat on it
> until we have something suitable. 

Sure, I'm all for doing it the Right Way. I wasn't aware of anything
Peter was doing in this area, so lets please see it.

It's not like opportunities to improve this haven't been around. My plan
was/is to convert to using the get_block() tricks of O_DIRECT, one could
easily argue that the work should have been done then. And perhaps
direct-io.c wouldn't be such a steaming pile of crap if it had been
done, and loop would already be fine since we could have tapped into
that.

> If we aren't done by end of Feb I'm happy to host a hackfest to get it
> sorted around the fs/storage summit..

Count me in :)

-- 
Jens Axboe

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