linux-kernel - Re: [RFC PATCH 1/2] block: allow initialization of previously allocated request

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Date:	Tue, 11 May 2010 15:21:57 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Mike Snitzer <snitzer@...hat.com>
Cc:	dm-devel@...hat.com, linux-kernel@...r.kernel.org,
	Kiyoshi Ueda <k-ueda@...jp.nec.com>,
	Jun'ichi Nomura <j-nomura@...jp.nec.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Nikanth Karthikesan <knikanth@...e.de>
Subject: Re: [RFC PATCH 1/2] block: allow initialization of previously
	allocated request_queue

On Tue, May 11 2010, Mike Snitzer wrote:
> On Tue, May 11 2010 at  2:55am -0400,
> Jens Axboe <jens.axboe@...cle.com> wrote:
> 
> > On Mon, May 10 2010, Mike Snitzer wrote:
> > > blk_init_queue() allocates the request_queue structure and then
> > > initializes it as needed (request_fn, elevator, etc).
> > > 
> > > Split initialization out to blk_init_allocated_queue_node.
> > > Introduce blk_init_allocated_queue wrapper function to model existing
> > > blk_init_queue and blk_init_queue_node interfaces.
> > > 
> > > Export elv_register_queue to allow a newly added elevator to be
> > > registered with sysfs.  Export elv_unregister_queue for symmetry.
> > > 
> > > These changes allow DM to initialize a device's request_queue with more
> > > precision.  In particular, DM no longer unconditionally initializes a
> > > full request_queue (elevator et al).  It only does so for a
> > > request-based DM device.
> > 
> > Looks good, I'll apply this. I don't think the exports need to be _GPL
> > in this case, generally I've only done that with the exports for hooking
> > in a new IO scheduler.
> 
> OK, thanks for picking this up.  Do you want me to send v2 that drops
> the _GPL or will you make those changes?

I just hand-edited that part. I can add the dm bit as well, when it has
been reviewed and acked.

-- 
Jens Axboe

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