From: majianpeng <majianpeng@gmail.com>
Date: Thu, 14 Nov 2013 04:16:18 +0000 (+1100)
Subject: raid1: Replace raise_barrier/lower_barrier with freeze_array/unfreeze_array when... 
X-Git-Tag: v3.13-rc1~31^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07169fd478ed2fbb3c894d524be9400658f16747;p=pandora-kernel.git

raid1: Replace raise_barrier/lower_barrier with freeze_array/unfreeze_array when reconfiguring the array.

We used to use raise_barrier to suspend normal IO while we reconfigure
the array.  However raise_barrier will soon only suspend some normal
IO, not all.  So we need something else.
Change it to use freeze_array.
But freeze_array not only suspends normal io, it also suspends
resync io.
For the place where call raise_barrier for reconfigure, it isn't a
problem.

Signed-off-by: Jianpeng Ma <majianpeng@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>
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