diff options
author | Philipp Reisner <philipp.reisner@linbit.com> | 2014-03-18 13:24:35 (GMT) |
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committer | Philipp Reisner <philipp.reisner@linbit.com> | 2014-07-10 16:35:01 (GMT) |
commit | 5d0b17f1a29e8189d04aef447a3a53cfd05529b2 (patch) | |
tree | 2d53fe259fd70241a40f33438b4b3676676bbf2c /drivers/block/drbd/drbd_receiver.c | |
parent | 4920e37a9e851172158ecc0fd7e060712dc1b5e8 (diff) | |
download | linux-5d0b17f1a29e8189d04aef447a3a53cfd05529b2.tar.xz |
drbd: New net configuration option socket-check-timeout
In setups involving a DRBD-proxy and connections that experience a lot of
buffer-bloat it might be necessary to set ping-timeout to an
unusual high value. By default DRBD uses the same value to wait if a newly
established TCP-connection is stable. Since the DRBD-proxy is usually located
in the same data center such a long wait time may hinder DRBD's connect process.
In such setups socket-check-timeout should be set to
at least to the round trip time between DRBD and DRBD-proxy. I.e. in most
cases to 1.
Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Diffstat (limited to 'drivers/block/drbd/drbd_receiver.c')
-rw-r--r-- | drivers/block/drbd/drbd_receiver.c | 46 |
1 files changed, 30 insertions, 16 deletions
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c index 7da83f3..b89e6fb 100644 --- a/drivers/block/drbd/drbd_receiver.c +++ b/drivers/block/drbd/drbd_receiver.c @@ -819,7 +819,7 @@ static int receive_first_packet(struct drbd_connection *connection, struct socke * drbd_socket_okay() - Free the socket if its connection is not okay * @sock: pointer to the pointer to the socket. */ -static int drbd_socket_okay(struct socket **sock) +static bool drbd_socket_okay(struct socket **sock) { int rr; char tb[4]; @@ -837,6 +837,30 @@ static int drbd_socket_okay(struct socket **sock) return false; } } + +static bool connection_established(struct drbd_connection *connection, + struct socket **sock1, + struct socket **sock2) +{ + struct net_conf *nc; + int timeout; + bool ok; + + if (!*sock1 || !*sock2) + return false; + + rcu_read_lock(); + nc = rcu_dereference(connection->net_conf); + timeout = (nc->sock_check_timeo ?: nc->ping_timeo) * HZ / 10; + rcu_read_unlock(); + schedule_timeout_interruptible(timeout); + + ok = drbd_socket_okay(sock1); + ok = drbd_socket_okay(sock2) && ok; + + return ok; +} + /* Gets called if a connection is established, or if a new minor gets created in a connection */ int drbd_connected(struct drbd_peer_device *peer_device) @@ -878,8 +902,8 @@ static int conn_connect(struct drbd_connection *connection) struct drbd_socket sock, msock; struct drbd_peer_device *peer_device; struct net_conf *nc; - int vnr, timeout, h, ok; - bool discard_my_data; + int vnr, timeout, h; + bool discard_my_data, ok; enum drbd_state_rv rv; struct accept_wait_data ad = { .connection = connection, @@ -923,17 +947,8 @@ static int conn_connect(struct drbd_connection *connection) } } - if (sock.socket && msock.socket) { - rcu_read_lock(); - nc = rcu_dereference(connection->net_conf); - timeout = nc->ping_timeo * HZ / 10; - rcu_read_unlock(); - schedule_timeout_interruptible(timeout); - ok = drbd_socket_okay(&sock.socket); - ok = drbd_socket_okay(&msock.socket) && ok; - if (ok) - break; - } + if (connection_established(connection, &sock.socket, &msock.socket)) + break; retry: s = drbd_wait_for_connect(connection, &ad); @@ -979,8 +994,7 @@ randomize: goto out_release_sockets; } - ok = drbd_socket_okay(&sock.socket); - ok = drbd_socket_okay(&msock.socket) && ok; + ok = connection_established(connection, &sock.socket, &msock.socket); } while (!ok); if (ad.s_listen) |