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dlm: fix race while closing connections 

When a connection have issues DLM may need to close it.  Therefore we
should also cancel pending workqueues for such connection at that time,
and not just when dlm is not willing to use this connection anymore.

Also, if we don't clear CF_CONNECT_PENDING flag, the error handling
routines won't be able to re-connect as lowcomms_connect_sock() will
check for it.

Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Marcelo Ricardo Leitner 2015-08-11 19:22:21 -03:00 committed by David Teigland
parent 28926a0965
commit 0d737a8cfd
1 changed files with 15 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

29
fs/dlm/lowcomms.c
View File

@ -514,17 +514,24 @@ static void make_sockaddr(struct sockaddr_storage *saddr, uint16_t port,
}
/* Close a remote connection and tidy up */
static void close_connection(struct connection *con, bool and_other)
static void close_connection(struct connection *con, bool and_other,
bool tx, bool rx)
{
mutex_lock(&con->sock_mutex);
clear_bit(CF_CONNECT_PENDING, &con->flags);
clear_bit(CF_WRITE_PENDING, &con->flags);
if (tx && cancel_work_sync(&con->swork))
log_print("canceled swork for node %d", con->nodeid);
if (rx && cancel_work_sync(&con->rwork))
log_print("canceled rwork for node %d", con->nodeid);
mutex_lock(&con->sock_mutex);
if (con->sock) {
sock_release(con->sock);
con->sock = NULL;
}
if (con->othercon && and_other) {
/* Will only re-enter once. */
close_connection(con->othercon, false);
close_connection(con->othercon, false, true, true);
}
if (con->rx_page) {
__free_page(con->rx_page);
@ -902,7 +909,7 @@ out_resched:
out_close:
mutex_unlock(&con->sock_mutex);
if (ret != -EAGAIN) {
close_connection(con, false);
close_connection(con, false, true, false);
/* Reconnect when there is something to send */
}
/* Don't return success if we really got EOF */
@ -1622,7 +1629,7 @@ out:
send_error:
mutex_unlock(&con->sock_mutex);
close_connection(con, false);
close_connection(con, false, false, true);
lowcomms_connect_sock(con);
return;
@ -1654,15 +1661,9 @@ 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);
close_connection(con, true, true, true);
clean_one_writequeue(con);
close_connection(con, true);
}
spin_lock(&dlm_node_addrs_spin);
@ -1745,7 +1746,7 @@ static void stop_conn(struct connection *con)
static void free_conn(struct connection *con)
{
close_connection(con, true);
close_connection(con, true, true, true);
if (con->othercon)
kmem_cache_free(con_cache, con->othercon);
hlist_del(&con->list);
@ -1816,7 +1817,7 @@ fail_unlisten:
dlm_allow_conn = 0;
con = nodeid2con(0,0);
if (con) {
close_connection(con, false);
close_connection(con, false, true, true);
kmem_cache_free(con_cache, con);
}
fail_destroy: