drbd: Allow packet handler functions that take a connection (meta connection)

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

drivers/block/drbd/drbd_receiver.c

@@ -60,6 +60,11 @@ enum finish_epoch {
 	FE_RECYCLED,
 };
 
+enum mdev_or_conn {
+	MDEV,
+	CONN,
+};
+
 static int drbd_do_handshake(struct drbd_tconn *tconn);
 static int drbd_do_auth(struct drbd_tconn *tconn);
 static int drbd_disconnected(int vnr, void *p, void *data);
@@ -3876,10 +3881,7 @@ static int receive_out_of_sync(struct drbd_conf *mdev, enum drbd_packet cmd,
 struct data_cmd {
 	int expect_payload;
 	size_t pkt_size;
-	enum {
-		MDEV,
-		CONN,
-	} type;
+	enum mdev_or_conn fa_type; /* first argument's type */
 	union {
 		int (*mdev_fn)(struct drbd_conf *, enum drbd_packet cmd,
 				  unsigned int to_receive);
@@ -3954,7 +3956,7 @@ static void drbdd(struct drbd_tconn *tconn)
 			}
 		}
 
-		if (drbd_cmd_handler[pi.cmd].type == CONN) {
+		if (drbd_cmd_handler[pi.cmd].fa_type == CONN) {
 			rv = drbd_cmd_handler[pi.cmd].conn_fn(tconn, pi.cmd, pi.size - shs);
 		} else {
 			struct drbd_conf *mdev = vnr_to_mdev(tconn, pi.vnr);
@@ -4719,27 +4721,31 @@ static int tconn_process_done_ee(struct drbd_tconn *tconn)
 
 struct asender_cmd {
 	size_t pkt_size;
-	int (*process)(struct drbd_conf *, enum drbd_packet);
+	enum mdev_or_conn fa_type; /* first argument's type */
+	union {
+		int (*mdev_fn)(struct drbd_conf *mdev, enum drbd_packet cmd);
+		int (*conn_fn)(struct drbd_tconn *tconn, enum drbd_packet cmd);
+	};
 };
 
 static struct asender_cmd asender_tbl[] = {
-	[P_PING]	    = { sizeof(struct p_header), got_Ping },
-	[P_PING_ACK]	    = { sizeof(struct p_header), got_PingAck },
-	[P_RECV_ACK]	    = { sizeof(struct p_block_ack), got_BlockAck },
-	[P_WRITE_ACK]	    = { sizeof(struct p_block_ack), got_BlockAck },
-	[P_RS_WRITE_ACK]    = { sizeof(struct p_block_ack), got_BlockAck },
-	[P_DISCARD_WRITE]   = { sizeof(struct p_block_ack), got_BlockAck },
-	[P_NEG_ACK]	    = { sizeof(struct p_block_ack), got_NegAck },
-	[P_NEG_DREPLY]	    = { sizeof(struct p_block_ack), got_NegDReply },
-	[P_NEG_RS_DREPLY]   = { sizeof(struct p_block_ack), got_NegRSDReply},
-	[P_OV_RESULT]	    = { sizeof(struct p_block_ack), got_OVResult },
-	[P_BARRIER_ACK]	    = { sizeof(struct p_barrier_ack), got_BarrierAck },
-	[P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), got_RqSReply },
-	[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_RETRY_WRITE]	    = { sizeof(struct p_block_ack), got_BlockAck },
+	[P_PING]	    = { sizeof(struct p_header), MDEV, { got_Ping } },
+	[P_PING_ACK]	    = { sizeof(struct p_header), MDEV, { got_PingAck } },
+	[P_RECV_ACK]	    = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } },
+	[P_WRITE_ACK]	    = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } },
+	[P_RS_WRITE_ACK]    = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } },
+	[P_DISCARD_WRITE]   = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } },
+	[P_NEG_ACK]	    = { sizeof(struct p_block_ack), MDEV, { got_NegAck } },
+	[P_NEG_DREPLY]	    = { sizeof(struct p_block_ack), MDEV, { got_NegDReply } },
+	[P_NEG_RS_DREPLY]   = { sizeof(struct p_block_ack), MDEV, { got_NegRSDReply } },
+	[P_OV_RESULT]	    = { sizeof(struct p_block_ack), MDEV, { got_OVResult } },
+	[P_BARRIER_ACK]	    = { sizeof(struct p_barrier_ack), MDEV, { got_BarrierAck } },
+	[P_STATE_CHG_REPLY] = { sizeof(struct p_req_state_reply), MDEV, { got_RqSReply } },
+	[P_RS_IS_IN_SYNC]   = { sizeof(struct p_block_ack), MDEV, { got_IsInSync } },
+	[P_DELAY_PROBE]     = { sizeof(struct p_delay_probe93), MDEV, { got_skip } },
+	[P_RS_CANCEL]       = { sizeof(struct p_block_ack), MDEV, { got_NegRSDReply } },
+	[P_CONN_ST_CHG_REPLY]={ sizeof(struct p_req_state_reply), MDEV, { got_RqSReply } },
+	[P_RETRY_WRITE]	    = { sizeof(struct p_block_ack), MDEV, { got_BlockAck } },
 };
 
 int drbd_asender(struct drbd_thread *thi)
@@ -4842,10 +4848,20 @@ int drbd_asender(struct drbd_thread *thi)
 			}
 		}
 		if (received == expect) {
-			tconn->last_received = jiffies;
-			if (!cmd->process(vnr_to_mdev(tconn, pi.vnr), pi.cmd))
+			bool rv;
+
+			if (cmd->fa_type == CONN) {
+				rv = cmd->conn_fn(tconn, pi.cmd);
+			} else {
+				struct drbd_conf *mdev = vnr_to_mdev(tconn, pi.vnr);
+				rv = cmd->mdev_fn(mdev, pi.cmd);
+			}
+
+			if (!rv)
 				goto reconnect;
 
+			tconn->last_received = jiffies;
+
 			/* the idle_timeout (ping-int)
 			 * has been restored in got_PingAck() */
 			if (cmd == &asender_tbl[P_PING_ACK])