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

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Date:	Thu, 10 Jan 2008 07:47:38 -0500
From:	Chris Mason <chris.mason@...cle.com>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>,
	"Bryn M. Reeves" <breeves@...hat.com>
Subject: Re: [PATCH][RFC] fast file mapping for loop

On Thu, 10 Jan 2008 09:31:31 +0100
Jens Axboe <jens.axboe@...cle.com> wrote:

> On Wed, Jan 09 2008, Alasdair G Kergon wrote:
> > Here's the latest version of dm-loop, for comparison.
> > 
> > To try it out, 
> >   ln -s dmsetup dmlosetup
> > and supply similar basic parameters to losetup.
> > (using dmsetup version 1.02.11 or higher)
> 
> Why oh why does dm always insist to reinvent everything? That's bad
> enough in itself, but on top of that most of the extra stuff ends up
> being essentially unmaintained.

I don't quite get how the dm version is reinventing things.  They use
the dmsetup command that they use for everything else and provide a
small and fairly clean module for bio specific loop instead of piling
it onto loop.c....

Their code doesn't have the fancy hole handling that yours does, but
neither did yours 4 days ago ;)

> 
> If we instead improve loop, everyone wins.
> 
> Sorry to sound a bit harsh, but sometimes it doesn't hurt to think a
> bit outside your own sandbox.
> 

It is a natural fit in either place, as both loop and dm have a good
infrastructure for it.  I'm not picky about where it ends up, but dm
wouldn't be a bad place.

-chris
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