1 files changed, 83 insertions, 9 deletions

diff --git a/fs/ocfs2/cluster/tcp.c b/fs/ocfs2/cluster/tcp.c
index ebbaee664c66..457753df1ae7 100644
--- a/fs/ocfs2/cluster/tcp.c
+++ b/fs/ocfs2/cluster/tcp.c
@@ -380,6 +380,13 @@ static void o2net_sc_cancel_delayed_work(struct o2net_sock_container *sc,
                 sc_put(sc);
 }
 
+static atomic_t o2net_connected_peers = ATOMIC_INIT(0);
+
+int o2net_num_connected_peers(void)
+{
+        return atomic_read(&o2net_connected_peers);
+}
+
 static void o2net_set_nn_state(struct o2net_node *nn,
                                struct o2net_sock_container *sc,
                                unsigned valid, int err)
@@ -390,6 +397,11 @@ static void o2net_set_nn_state(struct o2net_node *nn,
 
         assert_spin_locked(&nn->nn_lock);
 
+        if (old_sc && !sc)
+                atomic_dec(&o2net_connected_peers);
+        else if (!old_sc && sc)
+                atomic_inc(&o2net_connected_peers);
+
         /* the node num comparison and single connect/accept path should stop
          * an non-null sc from being overwritten with another */
         BUG_ON(sc && nn->nn_sc && nn->nn_sc != sc);
@@ -1123,6 +1135,44 @@ static int o2net_check_handshake(struct o2net_sock_container *sc)
                 return -1;
         }
 
+        /*
+         * Ensure timeouts are consistent with other nodes, otherwise
+         * we can end up with one node thinking that the other must be down,
+         * but isn't. This can ultimately cause corruption.
+         */
+        if (be32_to_cpu(hand->o2net_idle_timeout_ms) !=
+                                o2net_idle_timeout(sc->sc_node)) {
+                mlog(ML_NOTICE, SC_NODEF_FMT " uses a network idle timeout of "
+                     "%u ms, but we use %u ms locally.  disconnecting\n",
+                     SC_NODEF_ARGS(sc),
+                     be32_to_cpu(hand->o2net_idle_timeout_ms),
+                     o2net_idle_timeout(sc->sc_node));
+                o2net_ensure_shutdown(nn, sc, -ENOTCONN);
+                return -1;
+        }
+
+        if (be32_to_cpu(hand->o2net_keepalive_delay_ms) !=
+                        o2net_keepalive_delay(sc->sc_node)) {
+                mlog(ML_NOTICE, SC_NODEF_FMT " uses a keepalive delay of "
+                     "%u ms, but we use %u ms locally.  disconnecting\n",
+                     SC_NODEF_ARGS(sc),
+                     be32_to_cpu(hand->o2net_keepalive_delay_ms),
+                     o2net_keepalive_delay(sc->sc_node));
+                o2net_ensure_shutdown(nn, sc, -ENOTCONN);
+                return -1;
+        }
+
+        if (be32_to_cpu(hand->o2hb_heartbeat_timeout_ms) !=
+                        O2HB_MAX_WRITE_TIMEOUT_MS) {
+                mlog(ML_NOTICE, SC_NODEF_FMT " uses a heartbeat timeout of "
+                     "%u ms, but we use %u ms locally.  disconnecting\n",
+                     SC_NODEF_ARGS(sc),
+                     be32_to_cpu(hand->o2hb_heartbeat_timeout_ms),
+                     O2HB_MAX_WRITE_TIMEOUT_MS);
+                o2net_ensure_shutdown(nn, sc, -ENOTCONN);
+                return -1;
+        }
+
         sc->sc_handshake_ok = 1;
 
         spin_lock(&nn->nn_lock);
@@ -1155,6 +1205,23 @@ static int o2net_advance_rx(struct o2net_sock_container *sc)
         sclog(sc, "receiving\n");
         do_gettimeofday(&sc->sc_tv_advance_start);
 
+        if (unlikely(sc->sc_handshake_ok == 0)) {
+                if(sc->sc_page_off < sizeof(struct o2net_handshake)) {
+                        data = page_address(sc->sc_page) + sc->sc_page_off;
+                        datalen = sizeof(struct o2net_handshake) - sc->sc_page_off;
+                        ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
+                        if (ret > 0)
+                                sc->sc_page_off += ret;
+                }
+
+                if (sc->sc_page_off == sizeof(struct o2net_handshake)) {
+                        o2net_check_handshake(sc);
+                        if (unlikely(sc->sc_handshake_ok == 0))
+                                ret = -EPROTO;
+                }
+                goto out;
+        }
+
         /* do we need more header? */
         if (sc->sc_page_off < sizeof(struct o2net_msg)) {
                 data = page_address(sc->sc_page) + sc->sc_page_off;
@@ -1162,15 +1229,6 @@ static int o2net_advance_rx(struct o2net_sock_container *sc)
                 ret = o2net_recv_tcp_msg(sc->sc_sock, data, datalen);
                 if (ret > 0) {
                         sc->sc_page_off += ret;
-
-                        /* this working relies on the handshake being
-                         * smaller than the normal message header */
-                        if (sc->sc_page_off >= sizeof(struct o2net_handshake)&&
-                            !sc->sc_handshake_ok && o2net_check_handshake(sc)) {
-                                ret = -EPROTO;
-                                goto out;
-                        }
-
                         /* only swab incoming here.. we can
                          * only get here once as we cross from
                          * being under to over */
@@ -1272,6 +1330,18 @@ static int o2net_set_nodelay(struct socket *sock)
         return ret;
 }
 
+static void o2net_initialize_handshake(void)
+{
+        o2net_hand->o2hb_heartbeat_timeout_ms = cpu_to_be32(
+                O2HB_MAX_WRITE_TIMEOUT_MS);
+        o2net_hand->o2net_idle_timeout_ms = cpu_to_be32(
+                o2net_idle_timeout(NULL));
+        o2net_hand->o2net_keepalive_delay_ms = cpu_to_be32(
+                o2net_keepalive_delay(NULL));
+        o2net_hand->o2net_reconnect_delay_ms = cpu_to_be32(
+                o2net_reconnect_delay(NULL));
+}
+
 /* ------------------------------------------------------------ */
 
 /* called when a connect completes and after a sock is accepted.  the
@@ -1286,6 +1356,7 @@ static void o2net_sc_connect_completed(struct work_struct *work)
               (unsigned long long)O2NET_PROTOCOL_VERSION,
               (unsigned long long)be64_to_cpu(o2net_hand->connector_id));
 
+        o2net_initialize_handshake();
         o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
         sc_put(sc);
 }
@@ -1514,6 +1585,8 @@ static void o2net_hb_node_down_cb(struct o2nm_node *node, int node_num,
 
         if (node_num != o2nm_this_node())
                 o2net_disconnect_node(node);
+
+        BUG_ON(atomic_read(&o2net_connected_peers) < 0);
 }
 
 static void o2net_hb_node_up_cb(struct o2nm_node *node, int node_num,
@@ -1677,6 +1750,7 @@ static int o2net_accept_one(struct socket *sock)
         o2net_register_callbacks(sc->sc_sock->sk, sc);
         o2net_sc_queue_work(sc, &sc->sc_rx_work);
 
+        o2net_initialize_handshake();
         o2net_sendpage(sc, o2net_hand, sizeof(*o2net_hand));
 
 out: