drbd: Fix an connection drop issue after enabling allow-two-primaries
Since drbd-8.4.0 it is possible to change the allow-two-primaries network option while the connection is established. The sequence code used to partially order packets from the data socket with packets from the meta-data socket, still assued that the allow-two-primaries option is constant while the connection is established. I.e. On a node that has the RESOLVE_CONFLICTS bits set, after enabling allow-two-primaries, when receiving the next data packet it timed out while waiting for the necessary packets on the data socket to arrive (wait_for_and_update_peer_seq() function). Fixed that by always tracking the sequence number, but only waiting for it if allow-two-primaries is set. Signed-off-by: NPhilipp Reisner <philipp.reisner@linbit.com> Signed-off-by: NLars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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