From: NeilBrown <neilb@suse.de>
Date: Thu, 11 Oct 2012 02:37:33 +0000 (+1100)
Subject: md: avoid taking the mutex on some ioctls.
X-Git-Tag: v3.7-rc1~10^2~21
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1ca69c4bc4b1ef889861db39f325901eadbf9497;p=pandora-kernel.git

md: avoid taking the mutex on some ioctls.

Some ioctls don't need to take the mutex and doing so can cause
a delay as it is held during super-block update.
So move those ioctls out of the mutex and rely on rcu locking
to ensure we don't access stale data.

Signed-off-by: NeilBrown <neilb@suse.de>
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