Create: check the node nums when create clustered raid

It doesn't make sense to create a clustered raid
with only 1 node.

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/Create.c b/Create.c
index 1e4a6ee065fde6a201bb1e356126cadf46ff711d..717086b080fef60f435b52a0ac15e0d31529256e 100644 (file)
--- a/Create.c
+++ b/Create.c
@@ -114,8 +114,13 @@ int Create(struct supertype *st, char *mddev,
        unsigned long long newsize;
 
        int major_num = BITMAP_MAJOR_HI;
-       if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0)
+       if (s->bitmap_file && strcmp(s->bitmap_file, "clustered") == 0) {
                major_num = BITMAP_MAJOR_CLUSTERED;
+               if (c->nodes <= 1) {
+                       pr_err("At least 2 nodes are needed for cluster-md\n");
+                       return 1;
+               }
+       }
 
        memset(&info, 0, sizeof(info));
        if (s->level == UnSet && st && st->ss->default_geometry)