From 5ad531db6e0f3c3c985666e83d3c1c4d53acccf9 Mon Sep 17 00:00:00 2001
From: Jens Axboe <jens.axboe@oracle.com>
Date: Fri, 3 Jul 2009 12:57:48 +0200
Subject: [PATCH] cfq-iosched: drain device queue before switching to a sync
 queue

To lessen the impact of async IO on sync IO, let the device drain of
any async IO in progress when switching to a sync cfqq that has idling
enabled.

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