From: Lars Ellenberg Date: Mon, 26 Sep 2011 13:24:56 +0000 (+0200) Subject: drbd: fix "stalled" empty resync X-Git-Tag: firefly_0821_release~3680^2~2719^2^2~38 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=40424e4a24bc500639cb4bf1bf846362b0e692a5;p=firefly-linux-kernel-4.4.55.git drbd: fix "stalled" empty resync With sync-after dependencies, given "lucky" timing of pause/unpause events, and the end of an empty (0 bits set) resync was sometimes not detected on the SyncTarget, leading to a "stalled" SyncSource state. Fixed this by expecting not only "Inconsistent -> UpToDate" but also "Consistent -> UpToDate" transitions for the peer disk state to end a resync. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index aa6c52c80e2e..1a48e02b83bc 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -3169,9 +3169,14 @@ 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 && + /* If this is the "end of sync" confirmation, usually the peer disk + * transitions from D_INCONSISTENT to D_UP_TO_DATE. For empty (0 bits + * set) resync started in PausedSyncT, or if the timing of pause-/ + * unpause-sync events has been "just right", the peer disk may + * transition from D_CONSISTENT to D_UP_TO_DATE as well. + */ + if ((os.pdsk == D_INCONSISTENT || os.pdsk == D_CONSISTENT) && + 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