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-rw-r--r--drivers/block/drbd/drbd_receiver.c34
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 585049dfb711..990fe01afa50 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -3260,6 +3260,40 @@ static int receive_state(struct drbd_conf *mdev, enum drbd_packets cmd, unsigned
os = ns = mdev->state;
spin_unlock_irq(&mdev->req_lock);
+ /* peer says his disk is uptodate, while we think it is inconsistent,
+ * and this happens while we think we have a sync going on. */
+ if (os.pdsk == D_INCONSISTENT && real_peer_disk == D_UP_TO_DATE &&
+ os.conn > C_CONNECTED && os.disk == D_UP_TO_DATE) {
+ /* If we are (becoming) SyncSource, but peer is still in sync
+ * preparation, ignore its uptodate-ness to avoid flapping, it
+ * will change to inconsistent once the peer reaches active
+ * syncing states.
+ * It may have changed syncer-paused flags, however, so we
+ * cannot ignore this completely. */
+ if (peer_state.conn > C_CONNECTED &&
+ peer_state.conn < C_SYNC_SOURCE)
+ real_peer_disk = D_INCONSISTENT;
+
+ /* if peer_state changes to connected at the same time,
+ * it explicitly notifies us that it finished resync.
+ * Maybe we should finish it up, too? */
+ else if (os.conn >= C_SYNC_SOURCE &&
+ peer_state.conn == C_CONNECTED) {
+ if (drbd_bm_total_weight(mdev) <= mdev->rs_failed)
+ drbd_resync_finished(mdev);
+ return TRUE;
+ }
+ }
+
+ /* peer says his disk is inconsistent, while we think it is uptodate,
+ * and this happens while the peer still thinks we have a sync going on,
+ * but we think we are already done with the sync.
+ * We ignore this to avoid flapping pdsk.
+ * This should not happen, if the peer is a recent version of drbd. */
+ if (os.pdsk == D_UP_TO_DATE && real_peer_disk == D_INCONSISTENT &&
+ os.conn == C_CONNECTED && peer_state.conn > C_SYNC_SOURCE)
+ real_peer_disk = D_UP_TO_DATE;
+
if (ns.conn == C_WF_REPORT_PARAMS)
ns.conn = C_CONNECTED;