From: NeilBrown <neilb@suse.de>
Date: Thu, 22 Dec 2011 23:17:50 +0000 (+1100)
Subject: md/raid5: be more thorough in calculating 'degraded' value.
X-Git-Tag: v3.3-rc1~164^2~33
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=908f4fbd265733310c17ecc906299846b5dac44a;p=pandora-kernel.git

md/raid5: be more thorough in calculating 'degraded' value.

When an array is being reshaped to change the number of devices,
the two halves can be differently degraded.  e.g. one could be
missing a device and the other not.

So we need to be more careful about calculating the 'degraded'
attribute.

Instead of just inc/dec at appropriate times, perform a full
re-calculation examining both possible cases.  This doesn't happen
often so it not a big cost, and we already have most of the code to
do it.

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