DLM: retry rcom when dlm_wait_function is timed out.

If a node sends a DLM_RCOM_STATUS command and an error occurs on the
receiving side, the DLM_RCOM_STATUS_REPLY response may not be returned.
We retransmitted the DLM_RCOM_STATUS command so that we do not wait for
an infinite response.

Signed-off-by: Tadashi Miyauchi <miyauchi@toshiba-tops.co.jp>
Signed-off-by: Tsutomu Owa <tsutomu.owa@toshiba.co.jp>
Signed-off-by: David Teigland <teigland@redhat.com>

fs/dlm/rcom.c

@@ -155,6 +155,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
 		goto out;
 	}
 
+retry:
 	error = create_rcom(ls, nodeid, DLM_RCOM_STATUS,
 			    sizeof(struct rcom_status), &rc, &mh);
 	if (error)
@@ -169,6 +170,8 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags)
 
 	error = dlm_wait_function(ls, &rcom_response);
 	disallow_sync_reply(ls);
+	if (error == -ETIMEDOUT)
+		goto retry;
 	if (error)
 		goto out;
 
@@ -276,6 +279,7 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 
 	ls->ls_recover_nodeid = nodeid;
 
+retry:
 	error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh);
 	if (error)
 		goto out;
@@ -288,6 +292,8 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len)
 
 	error = dlm_wait_function(ls, &rcom_response);
 	disallow_sync_reply(ls);
+	if (error == -ETIMEDOUT)
+		goto retry;
  out:
 	return error;
 }

fs/dlm/recover.c

@@ -52,6 +52,10 @@ int dlm_wait_function(struct dlm_ls *ls, int (*testfn) (struct dlm_ls *ls))
 					dlm_config.ci_recover_timer * HZ);
 		if (rv)
 			break;
+		if (test_bit(LSFL_RCOM_WAIT, &ls->ls_flags)) {
+			log_debug(ls, "dlm_wait_function timed out");
+			return -ETIMEDOUT;
+		}
 	}
 
 	if (dlm_recovery_stopped(ls)) {