File 0009-super1-add-more-checks-for-NodeNumUpdate-option.patch of Package mdadm.7533

From 400ed101278429299d6fdda2357777e5b0a55628 Mon Sep 17 00:00:00 2001
From: Guoqing Jiang <gqjiang@suse.com>
Date: Wed, 11 May 2016 15:02:50 +0800
Subject: [PATCH] super1: add more checks for NodeNumUpdate option

There are some cases which didn't need to check the space
is enough or not for NodeNumUpdate option.

1. for array which does not have clustered bitmap.
2. "--nodes" parameter is 0 (eg, add a disk to clustered raid).
3. if "--nodes" parameter is set to a smaller num than
   current bms->nodes.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
---
 super1.c | 22 +++++++++++++++++++---
 1 file changed, 19 insertions(+), 3 deletions(-)

diff --git a/super1.c b/super1.c
index fa93367..3d25fae 100644
--- a/super1.c
+++ b/super1.c
@@ -2394,9 +2394,25 @@ 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;
+		if (bms->version == BITMAP_MAJOR_CLUSTERED) {
+			if (st->nodes == 1) {
+				/* the parameter for nodes is not valid */
+				pr_err("Warning: cluster-md at least needs two nodes\n");
+				return -EINVAL;
+			} else if (st->nodes == 0)
+				/* --nodes is not specified */
+				break;
+			else if (__cpu_to_le32(st->nodes) < bms->nodes) {
+				/* Since the nodes num is not increased, no need to check the space
+				 * is enough or not, just update bms->nodes */
+				bms->nodes = __cpu_to_le32(st->nodes);
+				break;
+			}
+		} else {
+			/* no need to change bms->nodes for other bitmap types */
+			if (st->nodes)
+				pr_err("Warning: --nodes option is only suitable for clustered bitmap\n");
+			break;
 		}
 
 		/* Each node has an independent bitmap, it is necessary to calculate the
-- 
2.6.2