File 0040-super1-don-t-update-node-nums-if-it-is-not-more-than.patch of Package mdadm.7129

From 261b57fe219f7ebd37cf903c3696e9ea558536eb Mon Sep 17 00:00:00 2001
From: Guoqing Jiang <gqjiang@suse.com>
Date: Wed, 4 May 2016 16:33:44 +0800
Subject: [PATCH 265/359] super1: don't update node nums if it is not more than
 1
References: fate#316335 

We at least need two nodes for cluster raid so make the
check before update node nums.

Reported-by: Zhilong Liu <zlliu@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Coly Li <colyli@suse.de>

---
 super1.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/super1.c b/super1.c
index 8d5543f..972b470 100644
--- a/super1.c
+++ b/super1.c
@@ -2394,6 +2394,11 @@ static int write_bitmap1(struct supertype *st, int fd, enum bitmap_update update
 			return -EINVAL;
 		}
 
+		if (bms->version == BITMAP_MAJOR_CLUSTERED && st->nodes <= 1) {
+			pr_err("Warning: cluster-md at least needs two nodes\n");
+			return -EINVAL;
+		}
+
 		/* Each node has an independent bitmap, it is necessary to calculate the
 		 * space is enough or not, first get how many bytes for the total bitmap */
 		bm_space_per_node = calc_bitmap_size(bms, 4096);
-- 
2.16.1