drbd: Fixed compat issue with disconnecting 8.4 from a primary 8.3
For compatibility reasons 8.4 has to send P_STATE_CHG_REQ (instead
of P_CONN_ST_CHG_REQ) when disconnecting.
In the receiving code path we missed to convert the old
answer (P_STATE_CHG_REPLY) back to 8.4 logic. Therefore
the CL_ST_CHG_SUCCESS or CL_ST_CHG_FAIL bit in the flags word
of mdev got set, while the state code was waiting for
the CONN_WD_ST_CHG_OKAY or CONN_WD_ST_CHG_FAIL bits in tconn.
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_int.h b/drivers/block/drbd/drbd_int.h
index 8001b7a..e8461f8 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -811,6 +811,7 @@
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_REQ, /* A cluster wide state change on the connection is active */
CONN_WD_ST_CHG_OKAY,
CONN_WD_ST_CHG_FAIL,
CONN_DRY_RUN, /* Expect disconnect after resync handshake. */
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index c8d3f38..9b83f88 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -4827,6 +4827,11 @@
if (!mdev)
return -EIO;
+ if (test_bit(CONN_WD_ST_CHG_REQ, &tconn->flags)) {
+ D_ASSERT(tconn->agreed_pro_version < 100);
+ return got_conn_RqSReply(tconn, pi);
+ }
+
if (retcode >= SS_SUCCESS) {
set_bit(CL_ST_CHG_SUCCESS, &mdev->flags);
} else {
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index 70aa960..05ed131 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -1671,7 +1671,9 @@
spin_unlock_irq(&tconn->req_lock);
mutex_lock(&tconn->cstate_mutex);
+ set_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
if (conn_send_state_req(tconn, mask, val)) {
+ clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
rv = SS_CW_FAILED_BY_PEER;
/* if (f & CS_VERBOSE)
print_st_err(mdev, os, ns, rv); */
@@ -1679,6 +1681,7 @@
}
wait_event(tconn->ping_wait, (rv = _conn_rq_cond(tconn, mask, val)));
+ clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);
abort:
mutex_unlock(&tconn->cstate_mutex);