From: NeilBrown <neilb@suse.de>
Date: Mon, 5 Mar 2007 08:30:44 +0000 (-0800)
Subject: [PATCH] md: fix for raid6 reshape
X-Git-Tag: v2.6.21-rc3~72
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=6d3baf2eb8bd680b2d4f509bc3dbf4dcd6e27a40;p=pandora-kernel.git

[PATCH] md: fix for raid6 reshape

Recent patch for raid6 reshape had a change missing that showed up in
subsequent review.

Many places in the raid5 code used "conf->raid_disks-1" to mean "number of
data disks".  With raid6 that had to be changed to "conf->raid_disk -
conf->max_degraded" or similar.  One place was missed.

This bug means that if a raid6 reshape were aborted in the middle the
recorded position would be wrong.  On restart it would either fail (as the
position wasn't on an appropriate boundary) or would leave a section of the
array unreshaped, causing data corruption.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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