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authorPhilipp Reisner <philipp.reisner@linbit.com>2012-08-08 21:19:09 +0200
committerPhilipp Reisner <philipp.reisner@linbit.com>2012-11-09 14:08:18 +0100
commitb66623e33efbbf55717df7bfc49882371118b866 (patch)
tree3f345827c8fab3b4aa8f2b7cf7bd760c704483af /drivers
parent39a1aa7f49dc8eae5c8d3a4bf759eb7abeabe6c0 (diff)
downloadvexpress-lsk-b66623e33efbbf55717df7bfc49882371118b866.tar.gz
drbd: Avoid NetworkFailure state during disconnect
Disconnecting is a cluster wide state change. In case the peer node agrees to the state transition, it sends back the fact on the meta-data connection and closes both sockets. In case the node node that initiated the state transfer sees the closing action on the data-socket, before the P_STATE_CHG_REPLY packet, it was going into one of the network failure states. At least with the fencing option set to something else thatn "dont-care", the unclean shutdown of the connection causes a short IO freeze or a fence operation. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/block/drbd/drbd_int.h1
-rw-r--r--drivers/block/drbd/drbd_receiver.c30
-rw-r--r--drivers/block/drbd/drbd_state.c3
3 files changed, 33 insertions, 1 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index b83398d64a9..37ae87e468a 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -816,6 +816,7 @@ enum {
* so shrink_page_list() would not recurse into,
* and potentially deadlock on, this drbd worker.
*/
+ DISCONNECT_SENT,
};
struct drbd_tconn { /* is a resource from the config file */
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index 0eefbeb6566..1a8f698021a 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -522,7 +522,6 @@ static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size)
conn_err(tconn, "sock_recvmsg returned %d\n", rv);
break;
} else if (rv == 0) {
- conn_info(tconn, "sock was shut down by peer\n");
break;
} else {
/* signal came in, or peer/link went down,
@@ -535,9 +534,25 @@ static int drbd_recv(struct drbd_tconn *tconn, void *buf, size_t size)
set_fs(oldfs);
+ if (rv == 0) {
+ if (test_bit(DISCONNECT_SENT, &tconn->flags)) {
+ long t;
+ rcu_read_lock();
+ t = rcu_dereference(tconn->net_conf)->ping_timeo * HZ/10;
+ rcu_read_unlock();
+
+ t = wait_event_timeout(tconn->ping_wait, tconn->cstate < C_WF_REPORT_PARAMS, t);
+
+ if (t)
+ goto out;
+ }
+ conn_info(tconn, "sock was shut down by peer\n");
+ }
+
if (rv != size)
conn_request_state(tconn, NS(conn, C_BROKEN_PIPE), CS_HARD);
+out:
return rv;
}
@@ -894,6 +909,7 @@ static int conn_connect(struct drbd_tconn *tconn)
.door_bell = COMPLETION_INITIALIZER_ONSTACK(ad.door_bell),
};
+ clear_bit(DISCONNECT_SENT, &tconn->flags);
if (conn_request_state(tconn, NS(conn, C_WF_CONNECTION), CS_VERBOSE) < SS_SUCCESS)
return -2;
@@ -5316,6 +5332,18 @@ int drbd_asender(struct drbd_thread *thi)
received += rv;
buf += rv;
} else if (rv == 0) {
+ if (test_bit(DISCONNECT_SENT, &tconn->flags)) {
+ long t;
+ rcu_read_lock();
+ t = rcu_dereference(tconn->net_conf)->ping_timeo * HZ/10;
+ rcu_read_unlock();
+
+ t = wait_event_timeout(tconn->ping_wait,
+ tconn->cstate < C_WF_REPORT_PARAMS,
+ t);
+ if (t)
+ break;
+ }
conn_err(tconn, "meta connection shut down by peer.\n");
goto reconnect;
} else if (rv == -EAGAIN) {
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index c16349aec23..4fda4e2024e 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -1742,6 +1742,9 @@ conn_cl_wide(struct drbd_tconn *tconn, union drbd_state mask, union drbd_state v
goto abort;
}
+ if (val.conn == C_DISCONNECTING)
+ set_bit(DISCONNECT_SENT, &tconn->flags);
+
wait_event(tconn->ping_wait, (rv = _conn_rq_cond(tconn, mask, val)));
clear_bit(CONN_WD_ST_CHG_REQ, &tconn->flags);