linux-kernel - Re: Btrfs for mainline

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Date:	Sat, 03 Jan 2009 18:44:06 +0900 (JST)
From:	Ryusuke Konishi <konishi.ryusuke@....ntt.co.jp>
To:	Chris Mason <chris.mason@...cle.com>
Cc:	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: Btrfs for mainline

On Fri, 02 Jan 2009 14:38:07 -0500, Chris Mason <chris.mason@...cle.com> wrote:
> On Sat, 2009-01-03 at 01:37 +0900, Ryusuke Konishi wrote:
> > In addition, there seem to be well-separated reusable routines such as
> > async-thread (enhanced workqueue) and extent_map.  Do you intend to
> > move these into lib/ or so?
> 
> Sorry, looks like I hit send too soon that time.  The async-thread code
> is very self contained, and was intended for generic use.  Pushing that
> into lib is probably a good idea.

As for async-thread, kernel/ seems to be better place (sorry, I also hit
send too soon ;)

Anyway, I think it should be reviewed deeply by scheduler people and
wider range of people.  So, it's a good idea to put it out in order to
arouse interest.

> The extent_map and extent_buffer code was also intended for generic use.
> It needs some love and care (making it work for blocksize != pagesize)
> before I'd suggest moving it out of fs/btrfs.
> 
> -chris

The extent_map itself seemed independent of the problem to me, but I
understand your plan.

Btrfs seems to have other helpful code including pages/bio compression
which may become separable, too.  And, this may be the same for
pages/bio encryption/decryption code which would come next.  (I don't
mention about the volume management/raid feature here to avoid getting
off the subject, but it's likewise).

I think it's wonderful if they can be well-integrated into sublayers
or libraries.

Regards,
Ryusuke
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