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dlm: fix connection close handling 

Closing a connection to a node can create problems if there are
outstanding messages for that node.  The problems include dlm_send
spinning attempting to reconnect, or BUG from tcp_connect_to_sock()
attempting to use a partially closed connection.

To cleanly close a connection, we now first attempt to send any pending
messages, cancel any remaining workqueue work, and flag the connection
as closed to avoid reconnect attempts.

Signed-off-by: Lars Marowsky-Bree <lmb@suse.de>
Signed-off-by: Christine Caulfield <ccaulfie@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Lars Marowsky-Bree 2009-08-11 16:18:23 -05:00 committed by David Teigland
parent b5711b8e5a
commit 063c4c9963
1 changed files with 13 additions and 2 deletions
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15
fs/dlm/lowcomms.c
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@ -106,6 +106,7 @@ struct connection {
#define CF_CONNECT_PENDING 3
#define CF_INIT_PENDING 4
#define CF_IS_OTHERCON 5
#define CF_CLOSE 6
struct list_head writequeue; /* List of outgoing writequeue_entries */
spinlock_t writequeue_lock;
int (*rx_action) (struct connection *); /* What to do when active */
@ -299,6 +300,8 @@ static void lowcomms_write_space(struct sock *sk)
static inline void lowcomms_connect_sock(struct connection *con)
{
if (test_bit(CF_CLOSE, &con->flags))
return;
if (!test_and_set_bit(CF_CONNECT_PENDING, &con->flags))
queue_work(send_workqueue, &con->swork);
}
@ -1368,6 +1371,13 @@ int dlm_lowcomms_close(int nodeid)
log_print("closing connection to node %d", nodeid);
con = nodeid2con(nodeid, 0);
if (con) {
clear_bit(CF_CONNECT_PENDING, &con->flags);
clear_bit(CF_WRITE_PENDING, &con->flags);
set_bit(CF_CLOSE, &con->flags);
if (cancel_work_sync(&con->swork))
log_print("canceled swork for node %d", nodeid);
if (cancel_work_sync(&con->rwork))
log_print("canceled rwork for node %d", nodeid);
clean_one_writequeue(con);
close_connection(con, true);
}
@ -1393,9 +1403,10 @@ static void process_send_sockets(struct work_struct *work)
if (test_and_clear_bit(CF_CONNECT_PENDING, &con->flags)) {
con->connect_action(con);
set_bit(CF_WRITE_PENDING, &con->flags);
}
clear_bit(CF_WRITE_PENDING, &con->flags);
send_to_sock(con);
if (test_and_clear_bit(CF_WRITE_PENDING, &con->flags))
send_to_sock(con);
}