From: Alexander Aring aahringo@redhat.com
[ Upstream commit ba868d9deaab2bb1c09e50650127823925154802 ]
This patch will change the reconnect handling that if an error occurs if a socket error callback is occurred. This will also handle reconnects in a non blocking connecting case which is currently missing. If error ECONNREFUSED is reported we delay the reconnect by one second.
Signed-off-by: Alexander Aring aahringo@redhat.com Signed-off-by: David Teigland teigland@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/dlm/lowcomms.c | 60 ++++++++++++++++++++++++++++++----------------- 1 file changed, 39 insertions(+), 21 deletions(-)
diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 47bf99373f3e..cdc50e9a5ab0 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -79,6 +79,8 @@ struct connection { #define CF_CLOSING 8 #define CF_SHUTDOWN 9 #define CF_CONNECTED 10 +#define CF_RECONNECT 11 +#define CF_DELAY_CONNECT 12 struct list_head writequeue; /* List of outgoing writequeue_entries */ spinlock_t writequeue_lock; void (*connect_action) (struct connection *); /* What to do to connect */ @@ -87,6 +89,7 @@ struct connection { #define MAX_CONNECT_RETRIES 3 struct hlist_node list; struct connection *othercon; + struct connection *sendcon; struct work_struct rwork; /* Receive workqueue */ struct work_struct swork; /* Send workqueue */ wait_queue_head_t shutdown_wait; /* wait for graceful shutdown */ @@ -585,6 +588,22 @@ static void lowcomms_error_report(struct sock *sk) dlm_config.ci_tcp_port, sk->sk_err, sk->sk_err_soft); } + + /* below sendcon only handling */ + if (test_bit(CF_IS_OTHERCON, &con->flags)) + con = con->sendcon; + + switch (sk->sk_err) { + case ECONNREFUSED: + set_bit(CF_DELAY_CONNECT, &con->flags); + break; + default: + break; + } + + if (!test_and_set_bit(CF_RECONNECT, &con->flags)) + queue_work(send_workqueue, &con->swork); + out: read_unlock_bh(&sk->sk_callback_lock); if (orig_report) @@ -702,6 +721,8 @@ static void close_connection(struct connection *con, bool and_other, con->rx_leftover = 0; con->retries = 0; clear_bit(CF_CONNECTED, &con->flags); + clear_bit(CF_DELAY_CONNECT, &con->flags); + clear_bit(CF_RECONNECT, &con->flags); mutex_unlock(&con->sock_mutex); clear_bit(CF_CLOSING, &con->flags); } @@ -840,18 +861,15 @@ static int receive_from_sock(struct connection *con)
out_close: mutex_unlock(&con->sock_mutex); - if (ret != -EAGAIN) { - /* Reconnect when there is something to send */ + if (ret == 0) { close_connection(con, false, true, false); - if (ret == 0) { - log_print("connection %p got EOF from %d", - con, con->nodeid); - /* handling for tcp shutdown */ - clear_bit(CF_SHUTDOWN, &con->flags); - wake_up(&con->shutdown_wait); - /* signal to breaking receive worker */ - ret = -1; - } + log_print("connection %p got EOF from %d", + con, con->nodeid); + /* handling for tcp shutdown */ + clear_bit(CF_SHUTDOWN, &con->flags); + wake_up(&con->shutdown_wait); + /* signal to breaking receive worker */ + ret = -1; } return ret; } @@ -939,6 +957,7 @@ static int accept_from_sock(struct listen_connection *con)
lockdep_set_subclass(&othercon->sock_mutex, 1); newcon->othercon = othercon; + othercon->sendcon = newcon; } else { /* close other sock con if we have something new */ close_connection(othercon, false, true, false); @@ -1503,7 +1522,7 @@ static void send_to_sock(struct connection *con) cond_resched(); goto out; } else if (ret < 0) - goto send_error; + goto out; }
/* Don't starve people filling buffers */ @@ -1520,14 +1539,6 @@ static void send_to_sock(struct connection *con) mutex_unlock(&con->sock_mutex); return;
-send_error: - mutex_unlock(&con->sock_mutex); - close_connection(con, false, false, true); - /* Requeue the send work. When the work daemon runs again, it will try - a new connection, then call this function again. */ - queue_work(send_workqueue, &con->swork); - return; - out_connect: mutex_unlock(&con->sock_mutex); queue_work(send_workqueue, &con->swork); @@ -1602,8 +1613,15 @@ static void process_send_sockets(struct work_struct *work) struct connection *con = container_of(work, struct connection, swork);
clear_bit(CF_WRITE_PENDING, &con->flags); - if (con->sock == NULL) /* not mutex protected so check it inside too */ + + if (test_and_clear_bit(CF_RECONNECT, &con->flags)) + close_connection(con, false, false, true); + + if (con->sock == NULL) { /* not mutex protected so check it inside too */ + if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags)) + msleep(1000); con->connect_action(con); + } if (!list_empty(&con->writequeue)) send_to_sock(con); }