From: Mike Snitzer <snitzer@redhat.com>
Date: Wed, 11 Mar 2015 19:01:09 +0000 (-0400)
Subject: dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr
X-Git-Tag: omap-for-v4.2/o2_dc~96^2~14
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=17e149b8f73ba116e71e25930dd6f2eb3828792d;p=pandora-kernel.git

dm: add 'use_blk_mq' module param and expose in per-device ro sysfs attr

Request-based DM's blk-mq support defaults to off; but a user can easily
change the default using the dm_mod.use_blk_mq module/boot option.

Also, you can check what mode a given request-based DM device is using
with: cat /sys/block/dm-X/dm/use_blk_mq

This change enabled further cleanup and reduced work (e.g. the
md->io_pool and md->rq_pool isn't created if using blk-mq).

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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