From: Lars Ellenberg Date: Wed, 21 Jul 2010 15:04:32 +0000 (+0200) Subject: drbd: fix for spurious full sync (becoming sync target looked like invalidate) X-Git-Tag: upstream/snapshot3+hdmi~12709^2~25 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f2906e183f5460df9d9e774f5952f5ff670b3913;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git drbd: fix for spurious full sync (becoming sync target looked like invalidate) If a synctarget lost connection while being WFSyncUUID, due to "state sanitizing", the attempted state change to SyncTarget looked like an "invalidate" to after_state_ch() later, thus caused a full sync on next handshake (Bug #318). drbd0: PingAck did not arrive in time. drbd0: peer( Primary -> Unknown ) conn( WFSyncUUID -> NetworkFailure ) pdsk( UpToDate -> DUnknown ) from : { cs:NetworkFailure ro:Secondary/Unknown ds:UpToDate/DUnknown r--- } to : { cs:SyncTarget ro:Secondary/Unknown ds:Inconsistent/DUnknown r--- } after sanizising, resulted in state: { cs:NetworkFailure ro:Secondary/Unknown ds:Inconsistent/DUnknown r--- } drbd0: disk( UpToDate -> Inconsistent ) Fix: don't mask state transition errors in "sanitizing", so the requested state change to SyncTarget fails, instead of being implicitly "remaped" to invalidate. Signed-off-by: Philipp Reisner Signed-off-by: Lars Ellenberg --- diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 2060db6..04c305d 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -827,9 +827,10 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state os.conn <= C_DISCONNECTING) ns.conn = os.conn; - /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow */ + /* After a network error (+C_TEAR_DOWN) only C_UNCONNECTED or C_DISCONNECTING can follow. + * If you try to go into some Sync* state, that shall fail (elsewhere). */ if (os.conn >= C_TIMEOUT && os.conn <= C_TEAR_DOWN && - ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING) + ns.conn != C_UNCONNECTED && ns.conn != C_DISCONNECTING && ns.conn <= C_TEAR_DOWN) ns.conn = os.conn; /* After C_DISCONNECTING only C_STANDALONE may follow */