From: Martin K. Petersen <martin.petersen@oracle.com>
Date: Fri, 22 May 2009 21:17:52 +0000 (-0400)
Subject: block: Expose stacked device queues in sysfs
X-Git-Tag: v2.6.31-rc1~389^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cd43e26f071524647e660706b784ebcbefbd2e44;p=pandora-kernel.git

block: Expose stacked device queues in sysfs

Currently stacking devices do not have a queue directory in sysfs.
However, many of the I/O characteristics like sector size, maximum
request size, etc. are queue properties.

This patch enables the queue directory for MD/DM devices.  The elevator
code has been modified to deal with queues that do not have an I/O
scheduler.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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