drbd: Ignore packets for non existing volumes

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

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 1aace37c5160ffbcf879a59ca1fbaa746dac16f9..57691a3b8f3baa5f85ac48f7179b18160afba7b8 100644 (file)
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3794,27 +3794,40 @@ static int receive_bitmap(struct drbd_conf *mdev, enum drbd_packet cmd,
        return ok;
 }
 
-static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd,
-                       unsigned int data_size)
+static int _tconn_receive_skip(struct drbd_tconn *tconn, unsigned int data_size)
 {
        /* TODO zero copy sink :) */
        static char sink[128];
        int size, want, r;
 
-       dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
-                cmd, data_size);
-
        size = data_size;
        while (size > 0) {
                want = min_t(int, size, sizeof(sink));
-               r = drbd_recv(mdev->tconn, sink, want);
-               if (!expect(r > 0))
+               r = drbd_recv(tconn, sink, want);
+               if (r <= 0)
                        break;
                size -= r;
        }
        return size == 0;
 }
 
+static int receive_skip(struct drbd_conf *mdev, enum drbd_packet cmd,
+                       unsigned int data_size)
+{
+       dev_warn(DEV, "skipping unknown optional packet type %d, l: %d!\n",
+                cmd, data_size);
+
+       return _tconn_receive_skip(mdev->tconn, data_size);
+}
+
+static int tconn_receive_skip(struct drbd_tconn *tconn, enum drbd_packet cmd, unsigned int data_size)
+{
+       conn_warn(tconn, "skipping packet for non existing volume type %d, l: %d!\n",
+                 cmd, data_size);
+
+       return _tconn_receive_skip(tconn, data_size);
+}
+
 static int receive_UnplugRemote(struct drbd_conf *mdev, enum drbd_packet cmd,
                                unsigned int data_size)
 {
@@ -3890,6 +3903,7 @@ static struct data_cmd drbd_cmd_handler[] = {
 static void drbdd(struct drbd_tconn *tconn)
 {
        struct p_header *header = &tconn->data.rbuf.header;
+       struct drbd_conf *mdev;
        struct packet_info pi;
        size_t shs; /* sub header size */
        int rv;
@@ -3920,7 +3934,10 @@ static void drbdd(struct drbd_tconn *tconn)
                        }
                }
 
-               rv = drbd_cmd_handler[pi.cmd].function(vnr_to_mdev(tconn, pi.vnr), pi.cmd, pi.size - shs);
+               mdev = vnr_to_mdev(tconn, pi.vnr);
+               rv = mdev ?
+                       drbd_cmd_handler[pi.cmd].function(mdev, pi.cmd, pi.size - shs) :
+                       tconn_receive_skip(tconn, pi.cmd, pi.size - shs);
 
                if (unlikely(!rv)) {
                        conn_err(tconn, "error receiving %s, l: %d!\n",