blk-mq-sched: unify request prepare methods

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This patch makes sure we always allocate requests in the core blk-mq
code and use a common prepare_request method to initialize them for
both mq I/O schedulers.  For Kyber and additional limit_depth method
is added that is called before allocating the request.

Also because none of the intializations can really fail the new method
does not return an error - instead the bfq finish method is hardened
to deal with the no-IOC case.

Last but not least this removes the abuse of RQF_QUEUE by the blk-mq
scheduling code as RQF_ELFPRIV is all that is needed now.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Christoph Hellwig 2017-06-16 18:15:26 +02:00 • committed by Jens Axboe

parent 44e8c2bff8

commit 5bbf4e5a8e

4 changed files with 31 additions and 37 deletions

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include/linux/elevator.h

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