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authorLars Ellenberg <lars.ellenberg@linbit.com>2018-12-20 17:23:38 +0100
committerJens Axboe <axboe@kernel.dk>2018-12-20 09:51:30 -0700
commitbe80ff88356ab6f5529daf24d3052a4e3cc727ec (patch)
tree41c6c04e785e2fe036aef58406b1114009ec875d /drivers/block
parentf708bd08ecbdc23d03aaedf5b3311ebe44cfdb50 (diff)
drbd: avoid spurious self-outdating with concurrent disconnect / down
If peers are "simultaneously" told to disconnect from each other, either explicitly, or implicitly by taking down the resource, with bad timing, one side may see its disconnect "fail" with a result of "state change failed by peer", and interpret this as "please oudate yourself". Try to catch this by checking for current connection status, and possibly retry as local-only state change instead. Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/drbd/drbd_nl.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 1958eb33b643..82915880c5e9 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -2711,8 +2711,10 @@ out:
static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection, bool force)
{
+ enum drbd_conns cstate;
enum drbd_state_rv rv;
+repeat:
rv = conn_request_state(connection, NS(conn, C_DISCONNECTING),
force ? CS_HARD : 0);
@@ -2730,6 +2732,11 @@ static enum drbd_state_rv conn_try_disconnect(struct drbd_connection *connection
break;
case SS_CW_FAILED_BY_PEER:
+ spin_lock_irq(&connection->resource->req_lock);
+ cstate = connection->cstate;
+ spin_unlock_irq(&connection->resource->req_lock);
+ if (cstate <= C_WF_CONNECTION)
+ goto repeat;
/* The peer probably wants to see us outdated. */
rv = conn_request_state(connection, NS2(conn, C_DISCONNECTING,
disk, D_OUTDATED), 0);