From: Jianpeng Ma <majianpeng@gmail.com>
Date: Thu, 2 Aug 2012 07:50:39 +0000 (+0200)
Subject: fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices
X-Git-Tag: v3.6-rc4~18^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=53362a05ae683e12a20d9ffdf58a88094a0bed9d;p=pandora-kernel.git

fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices

For regular file, write operaion used blk_plug function.But for block
file,write operation did not use blk_plug.
This patch is also for write-cache mode for block-device.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Reviewed-by: NeilBrown <neilb@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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