diff options
| author | Philipp Reisner <philipp.reisner@linbit.com> | 2010-12-23 13:24:33 (GMT) |
|---|---|---|
| committer | Philipp Reisner <philipp.reisner@linbit.com> | 2011-03-10 10:45:26 (GMT) |
| commit | da0a78161d2b2da4819a1f05a38bb1dcbe02d951 (patch) | |
| tree | 2228b9b03e645d5339b812c6330b44756675b36c | |
| parent | d612d309e4c8401ad94c531678b59c4a8b7c41ce (diff) | |
| download | linux-fsl-qoriq-da0a78161d2b2da4819a1f05a38bb1dcbe02d951.tar.xz | |
drbd: Be more careful with SyncSource -> Ahead transitions
We may not get from SyncSource to Ahead if we have sent some
P_RS_DATA_REPLY packets to the peer and are waiting for
P_WRITE_ACK.
Again, this is not relevant for proper tuned systems, but makes
sure that the not-tuned system does not get diverging bitmaps.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
| -rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 3 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_req.c | 8 |
2 files changed, 9 insertions, 2 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index bf865bd..fd0957f 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -4385,10 +4385,11 @@ static int got_BarrierAck(struct drbd_conf *mdev, struct p_header80 *h) if (mdev->state.conn == C_AHEAD && atomic_read(&mdev->ap_in_flight) == 0 && + atomic_read(&mdev->rs_pending_cnt) == 0 && list_empty(&mdev->start_resync_work.list)) { struct drbd_work *w = &mdev->start_resync_work; w->cb = w_start_resync; - drbd_queue_work_front(&mdev->data.work, w); + drbd_queue_work(&mdev->data.work, w); } return true; diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 8891751..a3f6b04 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1002,7 +1002,13 @@ allocate_barrier: congested = 1; } - if (congested) { + if (congested && atomic_read(&mdev->rs_pending_cnt) == 0) { + /* rs_pending_cnt must be zero, otherwise the two peers + might get different bitmaps. With sane configurations + the resync stalls long before we might want to go into + AHEAD mode. + We could force the resync into PAUSE mode here if + rs_pending_cnt is > 0 ... */ queue_barrier(mdev); if (mdev->net_conf->on_congestion == OC_PULL_AHEAD) |