From 9b6096a65f99a89dfd8328c4e469e7b53b3ae04a Mon Sep 17 00:00:00 2001
From: Shaohua Li <shaohua.li@intel.com>
Date: Thu, 17 Mar 2011 10:47:06 +0100
Subject: [PATCH] mm: make generic_writepages() use plugging

This recovers a performance regression caused by the removal
of the per-device plugging.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
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