From: Jens Axboe <axboe@fb.com>
Date: Thu, 22 May 2014 16:40:51 +0000 (-0600)
Subject: blk-mq: split make request handler for multi and single queue
X-Git-Tag: omap-for-v3.16/fixes-against-rc1~39^2~49^2~28
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07068d5b8e;p=pandora-kernel.git

blk-mq: split make request handler for multi and single queue

We want slightly different behavior from them:

- On single queue devices, we currently use the per-process plug
  for deferred IO and for merging.

- On multi queue devices, we don't use the per-process plug, but
  we want to go straight to hardware for SYNC IO.

Split blk_mq_make_request() into a blk_sq_make_request() for single
queue devices, and retain blk_mq_make_request() for multi queue
devices. Then we don't need multiple checks for q->nr_hw_queues
in the request mapping.

Signed-off-by: Jens Axboe <axboe@fb.com>
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