drbd: report sizes if rejecting too small peer disk

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

diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index cb80fb40636150f10f79d1a61ffc6e412d012d56..367b8e9bf76fcb18845d5a14dc70e48a8ba31965 100644 (file)
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3952,6 +3952,7 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info
        device->p_size = p_size;
 
        if (get_ldev(device)) {
+               sector_t new_size, cur_size;
                rcu_read_lock();
                my_usize = rcu_dereference(device->ldev->disk_conf)->disk_size;
                rcu_read_unlock();
@@ -3968,11 +3969,13 @@ static int receive_sizes(struct drbd_connection *connection, struct packet_info
 
                /* Never shrink a device with usable data during connect.
                   But allow online shrinking if we are connected. */
-               if (drbd_new_dev_size(device, device->ldev, p_usize, 0) <
-                   drbd_get_capacity(device->this_bdev) &&
+               new_size = drbd_new_dev_size(device, device->ldev, p_usize, 0);
+               cur_size = drbd_get_capacity(device->this_bdev);
+               if (new_size < cur_size &&
                    device->state.disk >= D_OUTDATED &&
                    device->state.conn < C_CONNECTED) {
-                       drbd_err(device, "The peer's disk size is too small!\n");
+                       drbd_err(device, "The peer's disk size is too small! (%llu < %llu sectors)\n",
+                                       (unsigned long long)new_size, (unsigned long long)cur_size);
                        conn_request_state(peer_device->connection, NS(conn, C_DISCONNECTING), CS_HARD);
                        put_ldev(device);
                        return -EIO;