From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 19 Nov 2013 16:25:07 +0000 (-0700)
Subject: blk-mq: ensure that we set REQ_IO_STAT so diskstats work
X-Git-Tag: v3.13-rc1~30^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=94eddfbeaafa3e8040a2c47d370dea0e58e76941;p=pandora-kernel.git

blk-mq: ensure that we set REQ_IO_STAT so diskstats work

If disk stats are enabled on the queue, a request needs to
be marked with REQ_IO_STAT for accounting to be active on
that request. This fixes an issue with virtio-blk not
showing up in /proc/diskstats after the conversion to
blk-mq.

Add QUEUE_FLAG_MQ_DEFAULT, setting stats and same cpu-group
completion on by default.

Reported-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
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