+static void o2hb_stop(const char *group)
+{
+ int ret;
+ char *argv[5], *envp[3];
+
+ argv[0] = (char *)o2nm_get_hb_ctl_path();
+ argv[1] = "-K";
+ argv[2] = "-u";
+ argv[3] = (char *)group;
+ argv[4] = NULL;
+
+ mlog(0, "Run: %s %s %s %s\n", argv[0], argv[1], argv[2], argv[3]);
+
+ /* minimal command environment taken from cpu_run_sbin_hotplug */
+ envp[0] = "HOME=/";
+ envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
+ envp[2] = NULL;
+
+ ret = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+ if (ret < 0)
+ mlog_errno(ret);
+}
+
+/*
+ * Hangup is a hack for tools compatibility. Older ocfs2-tools software
+ * expects the filesystem to call "ocfs2_hb_ctl" during unmount. This
+ * happens regardless of whether the DLM got started, so we can't do it
+ * in ocfs2_cluster_disconnect(). We bring the o2hb_stop() function into
+ * the glue and provide a "hangup" API for super.c to call.
+ *
+ * Other stacks will eventually provide a NULL ->hangup() pointer.
+ */
+void ocfs2_cluster_hangup(const char *group, int grouplen)
+{
+ BUG_ON(group == NULL);
+ BUG_ON(group[grouplen] != '\0');
+
+ o2hb_stop(group);
+}
+