From: Guoqing Jiang <gqjiang@suse.com>
Date: Wed, 4 May 2016 08:33:44 +0000 (+0800)
Subject: super1: don't update node nums if it is not more than 1
X-Git-Tag: mdadm-4.0~94
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=261b57fe219f7ebd37cf903c3696e9ea558536eb;p=thirdparty%2Fmdadm.git

super1: don't update node nums if it is not more than 1

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>
---

diff --git a/super1.c b/super1.c
index 8d5543f7..972b4700 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);