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drbd: avoid spurious self-outdating with concurrent disconnect / down

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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>
This commit is contained in:
Lars Ellenberg 2018-12-20 17:23:38 +01:00 committed by Jens Axboe
parent f708bd08ec
commit be80ff8835
1 changed files with 7 additions and 0 deletions
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7
drivers/block/drbd/drbd_nl.c
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@ -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/* The peer probably wants to see us outdated.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);