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SubjectRe: [RFC PATCH 1/2] block: allow initialization of previously allocated request_queue
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.

--
Jens Axboe



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