[dm-devel] [RFC PATCH 1/2] block: allow initialization of previously allocated request_queue

[Mike Snitzer]

On Tue, May 11 2010 at  2:55am -0400,
Jens Axboe <jens.axboe at oracle.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?

Mike