From: NeilBrown <neilb@suse.de>
Date: Tue, 31 Mar 2009 03:39:38 +0000 (+1100)
Subject: md/raid5: finish support for DDF/raid6
X-Git-Tag: v2.6.30-rc1~241^2~31
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=67cc2b8165857ba019920d1f00d64bcc4140075d;p=pandora-kernel.git

md/raid5: finish support for DDF/raid6

DDF requires RAID6 calculations over different devices in a different
order.
For md/raid6, we calculate over just the data devices, starting
immediately after the 'Q' block.
For ddf/raid6 we calculate over all devices, using zeros in place of
the P and Q blocks.

This requires unfortunately complex loops...

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