File DDF-compare_super_ddf-fix-sequence-number-check.patch of Package mdadm.2874

From 7039479987745f19b166b1c28d45dfc41420e6d9 Mon Sep 17 00:00:00 2001
From: "mwilck@arcor.de" <mwilck@arcor.de>
Date: Sat, 14 Sep 2013 22:47:12 +0200
Subject: [PATCH] DDF: compare_super_ddf: fix sequence number check

The sequence number check in compare_super_ddf was broken,
anchor sequence number is always -1.

With this patch, mdadm will refuse to add a disk with non-matching
sequence number.

This fixes Francis Moreau's problem reported with subject
"mdadm 3.3 fails to kick out non fresh disk".

FIXME: More work is needed here. Currently mdadm won't even add the
disk to the container, that's wrong. It should be added as a spare.

Signed-off-by: NeilBrown <neilb@suse.de>
---
 super-ddf.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- mdadm-3.3.orig/super-ddf.c
+++ mdadm-3.3/super-ddf.c
@@ -3893,10 +3893,10 @@ static int compare_super_ddf(struct supe
 	if (memcmp(first->anchor.guid, second->anchor.guid, DDF_GUID_LEN) != 0)
 		return 2;
 
-	if (!be32_eq(first->anchor.seq, second->anchor.seq)) {
-		dprintf("%s: sequence number mismatch %u/%u\n", __func__,
-			be32_to_cpu(first->anchor.seq),
-			be32_to_cpu(second->anchor.seq));
+	if (!be32_eq(first->active->seq, second->active->seq)) {
+		dprintf("%s: sequence number mismatch %u<->%u\n", __func__,
+			be32_to_cpu(first->active->seq),
+			be32_to_cpu(second->active->seq));
 		return 3;
 	}
 	if (first->max_part != second->max_part ||