drbd: Implemented receiving of P_CONN_ST_CHG_REPLY

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

drivers/block/drbd/drbd_int.h

@@ -914,6 +914,8 @@ enum {
 	SEND_PING,		/* whether asender should send a ping asap */
 	SIGNAL_ASENDER,		/* whether asender wants to be interrupted */
 	GOT_PING_ACK,		/* set when we receive a ping_ack packet, ping_wait gets woken */
+	CONN_WD_ST_CHG_OKAY,
+	CONN_WD_ST_CHG_FAIL,
 };
 
 struct drbd_tconn {			/* is a resource from the config file */

drivers/block/drbd/drbd_receiver.c

@@ -4265,9 +4265,11 @@ int drbdd_init(struct drbd_thread *thi)
 static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd)
 {
 	struct p_req_state_reply *p = &mdev->tconn->meta.rbuf.req_state_reply;
+	struct drbd_tconn *tconn = mdev->tconn;
 
 	int retcode = be32_to_cpu(p->retcode);
 
+	if (cmd == P_STATE_CHG_REPLY) {
 		if (retcode >= SS_SUCCESS) {
 			set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
 		} else {
@@ -4276,7 +4278,16 @@ static int got_RqSReply(struct drbd_conf *mdev, enum drbd_packet cmd)
 				drbd_set_st_err_str(retcode), retcode);
 		}
 		wake_up(&mdev->state_wait);
-
+	} else /* conn == P_CONN_ST_CHG_REPLY */ {
+		if (retcode >= SS_SUCCESS) {
+			set_bit(CONN_WD_ST_CHG_OKAY, &tconn->flags);
+		} else {
+			set_bit(CONN_WD_ST_CHG_FAIL, &tconn->flags);
+			conn_err(tconn, "Requested state change failed by peer: %s (%d)\n",
+				 drbd_set_st_err_str(retcode), retcode);
+		}
+		wake_up(&tconn->ping_wait);
+	}
 	return true;
 }
 
@@ -4553,6 +4564,7 @@ static struct asender_cmd *get_asender_cmd(int cmd)
 	[P_RS_IS_IN_SYNC]   = { sizeof(struct p_block_ack), got_IsInSync },
 	[P_DELAY_PROBE]     = { sizeof(struct p_delay_probe93), got_skip },
 	[P_RS_CANCEL]       = { sizeof(struct p_block_ack), got_NegRSDReply},
+	[P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), got_RqSReply },
 	[P_MAX_CMD]	    = { 0, NULL },
 	};
 	if (cmd > P_MAX_CMD || asender_tbl[cmd].process == NULL)