Set home-cluster while creating an array

The home-cluster is stored in the bitmap super block of the
array. The device can be assembled on a cluster with the
cluster name same as the one recorded in the bitmap.

If home-cluster is not specified, this is auto-detected using
dlopen corosync cmap library.

neilb: allow code to compile when corosync-devel is not installed.

Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 17 insertions, 0 deletions

diff --git a/mdadm.c b/mdadm.c
index 2ab006ab..1a32328e 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -596,6 +596,13 @@ int main(int argc, char *argv[])
 				exit(2);
 			}
 			continue;
+		case O(CREATE, ClusterName):
+			c.homecluster = optarg;
+			if (strlen(c.homecluster) > 64) {
+				pr_err("Cluster name too big.\n");
+				exit(ERANGE);
+			}
+			continue;
 		case O(CREATE,'x'): /* number of spare (eXtra) disks */
 			if (s.sparedisks) {
 				pr_err("spare-devices set twice: %d and %s\n",
@@ -1276,6 +1283,16 @@ int main(int argc, char *argv[])
 		c.require_homehost = 0;
 	}
 
+	if (c.homecluster == NULL && (c.nodes > 0)) {
+		c.homecluster = conf_get_homecluster();
+		if (c.homecluster == NULL)
+			rv = get_cluster_name(&c.homecluster);
+		if (rv != 0) {
+			pr_err("The md can't get cluster name\n");
+			exit(1);
+		}
+	}
+
 	if (c.backup_file && data_offset != INVALID_SECTORS) {
 		pr_err("--backup-file and --data-offset are incompatible\n");
 		exit(2);