fs: dlm: generic connect func
This patch adds a generic connect function for TCP and SCTP. If the connect functionality differs from each other additional callbacks in dlm_proto_ops were added. The sockopts callback handling will guarantee that sockets created by connect() will use the same options as sockets created by accept(). Signed-off-by: Alexander Aring <aahringo@redhat.com> Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Alexander Aring
David Teigland
parent
90d21fc047
commit
8728a455d2
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@ -143,15 +143,17 @@ struct dlm_node_addr {
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};
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struct dlm_proto_ops {
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bool try_new_addr;
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const char *name;
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int proto;
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int (*connect)(struct connection *con, struct socket *sock,
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struct sockaddr *addr, int addr_len);
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void (*sockopts)(struct socket *sock);
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int (*bind)(struct socket *sock);
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int (*listen_validate)(void);
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void (*listen_sockopts)(struct socket *sock);
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int (*listen_bind)(struct socket *sock);
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/* What to do to connect */
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void (*connect_action)(struct connection *con);
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/* What to do to shutdown */
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void (*shutdown_action)(struct connection *con);
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/* What to do to eof check */
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@ -186,9 +188,6 @@ static const struct dlm_proto_ops *dlm_proto_ops;
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static void process_recv_sockets(struct work_struct *work);
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static void process_send_sockets(struct work_struct *work);
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static void sctp_connect_to_sock(struct connection *con);
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static void tcp_connect_to_sock(struct connection *con);
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/* need to held writequeue_lock */
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static struct writequeue_entry *con_next_wq(struct connection *con)
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{
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@ -1151,189 +1150,6 @@ static int sctp_bind_addrs(struct socket *sock, uint16_t port)
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return result;
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}
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/* Initiate an SCTP association.
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This is a special case of send_to_sock() in that we don't yet have a
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peeled-off socket for this association, so we use the listening socket
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and add the primary IP address of the remote node.
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*/
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static void sctp_connect_to_sock(struct connection *con)
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{
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struct sockaddr_storage daddr;
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int result;
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int addr_len;
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struct socket *sock;
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unsigned int mark;
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mutex_lock(&con->sock_mutex);
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/* Some odd races can cause double-connects, ignore them */
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if (con->retries++ > MAX_CONNECT_RETRIES)
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goto out;
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if (con->sock) {
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log_print("node %d already connected.", con->nodeid);
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goto out;
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}
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memset(&daddr, 0, sizeof(daddr));
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result = nodeid_to_addr(con->nodeid, &daddr, NULL, true, &mark);
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if (result < 0) {
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log_print("no address for nodeid %d", con->nodeid);
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goto out;
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}
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/* Create a socket to communicate with */
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result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
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SOCK_STREAM, IPPROTO_SCTP, &sock);
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if (result < 0)
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goto socket_err;
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sock_set_mark(sock->sk, mark);
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add_sock(sock, con);
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/* Bind to all addresses. */
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if (sctp_bind_addrs(con->sock, 0))
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goto bind_err;
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make_sockaddr(&daddr, dlm_config.ci_tcp_port, &addr_len);
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log_print_ratelimited("connecting to %d", con->nodeid);
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/* Turn off Nagle's algorithm */
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sctp_sock_set_nodelay(sock->sk);
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/*
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* Make sock->ops->connect() function return in specified time,
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* since O_NONBLOCK argument in connect() function does not work here,
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* then, we should restore the default value of this attribute.
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*/
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sock_set_sndtimeo(sock->sk, 5);
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result = sock->ops->connect(sock, (struct sockaddr *)&daddr, addr_len,
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0);
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sock_set_sndtimeo(sock->sk, 0);
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if (result == -EINPROGRESS)
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result = 0;
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if (result == 0) {
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if (!test_and_set_bit(CF_CONNECTED, &con->flags))
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log_print("successful connected to node %d", con->nodeid);
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goto out;
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}
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bind_err:
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con->sock = NULL;
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sock_release(sock);
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socket_err:
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/*
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* Some errors are fatal and this list might need adjusting. For other
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* errors we try again until the max number of retries is reached.
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*/
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if (result != -EHOSTUNREACH &&
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result != -ENETUNREACH &&
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result != -ENETDOWN &&
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result != -EINVAL &&
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result != -EPROTONOSUPPORT) {
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log_print("connect %d try %d error %d", con->nodeid,
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con->retries, result);
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mutex_unlock(&con->sock_mutex);
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msleep(1000);
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lowcomms_connect_sock(con);
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return;
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}
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out:
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mutex_unlock(&con->sock_mutex);
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}
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/* Connect a new socket to its peer */
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static void tcp_connect_to_sock(struct connection *con)
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{
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struct sockaddr_storage saddr, src_addr;
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unsigned int mark;
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int addr_len;
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struct socket *sock = NULL;
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int result;
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mutex_lock(&con->sock_mutex);
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if (con->retries++ > MAX_CONNECT_RETRIES)
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goto out;
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/* Some odd races can cause double-connects, ignore them */
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if (con->sock)
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goto out;
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/* Create a socket to communicate with */
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result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
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SOCK_STREAM, IPPROTO_TCP, &sock);
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if (result < 0)
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goto out_err;
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memset(&saddr, 0, sizeof(saddr));
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result = nodeid_to_addr(con->nodeid, &saddr, NULL, false, &mark);
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if (result < 0) {
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log_print("no address for nodeid %d", con->nodeid);
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goto out_err;
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}
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sock_set_mark(sock->sk, mark);
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add_sock(sock, con);
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/* Bind to our cluster-known address connecting to avoid
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routing problems */
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memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr));
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make_sockaddr(&src_addr, 0, &addr_len);
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result = sock->ops->bind(sock, (struct sockaddr *) &src_addr,
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addr_len);
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if (result < 0) {
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log_print("could not bind for connect: %d", result);
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/* This *may* not indicate a critical error */
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}
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make_sockaddr(&saddr, dlm_config.ci_tcp_port, &addr_len);
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log_print_ratelimited("connecting to %d", con->nodeid);
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/* Turn off Nagle's algorithm */
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tcp_sock_set_nodelay(sock->sk);
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result = sock->ops->connect(sock, (struct sockaddr *)&saddr, addr_len,
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O_NONBLOCK);
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if (result == -EINPROGRESS)
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result = 0;
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if (result == 0)
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goto out;
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out_err:
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if (con->sock) {
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sock_release(con->sock);
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con->sock = NULL;
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} else if (sock) {
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sock_release(sock);
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}
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/*
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* Some errors are fatal and this list might need adjusting. For other
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* errors we try again until the max number of retries is reached.
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*/
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if (result != -EHOSTUNREACH &&
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result != -ENETUNREACH &&
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result != -ENETDOWN &&
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result != -EINVAL &&
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result != -EPROTONOSUPPORT) {
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log_print("connect %d try %d error %d", con->nodeid,
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con->retries, result);
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mutex_unlock(&con->sock_mutex);
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msleep(1000);
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lowcomms_connect_sock(con);
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return;
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}
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out:
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mutex_unlock(&con->sock_mutex);
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return;
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}
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/* Get local addresses */
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static void init_local(void)
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{
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@ -1687,6 +1503,74 @@ static void process_listen_recv_socket(struct work_struct *work)
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accept_from_sock(&listen_con);
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}
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static void dlm_connect(struct connection *con)
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{
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struct sockaddr_storage addr;
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int result, addr_len;
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struct socket *sock;
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unsigned int mark;
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/* Some odd races can cause double-connects, ignore them */
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if (con->retries++ > MAX_CONNECT_RETRIES)
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return;
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if (con->sock) {
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log_print("node %d already connected.", con->nodeid);
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return;
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}
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memset(&addr, 0, sizeof(addr));
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result = nodeid_to_addr(con->nodeid, &addr, NULL,
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dlm_proto_ops->try_new_addr, &mark);
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if (result < 0) {
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log_print("no address for nodeid %d", con->nodeid);
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return;
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}
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/* Create a socket to communicate with */
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result = sock_create_kern(&init_net, dlm_local_addr[0]->ss_family,
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SOCK_STREAM, dlm_proto_ops->proto, &sock);
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if (result < 0)
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goto socket_err;
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sock_set_mark(sock->sk, mark);
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dlm_proto_ops->sockopts(sock);
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add_sock(sock, con);
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result = dlm_proto_ops->bind(sock);
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if (result < 0)
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goto add_sock_err;
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log_print_ratelimited("connecting to %d", con->nodeid);
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make_sockaddr(&addr, dlm_config.ci_tcp_port, &addr_len);
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result = dlm_proto_ops->connect(con, sock, (struct sockaddr *)&addr,
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addr_len);
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if (result < 0)
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goto add_sock_err;
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return;
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add_sock_err:
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dlm_close_sock(&con->sock);
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socket_err:
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/*
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* Some errors are fatal and this list might need adjusting. For other
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* errors we try again until the max number of retries is reached.
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*/
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if (result != -EHOSTUNREACH &&
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result != -ENETUNREACH &&
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result != -ENETDOWN &&
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result != -EINVAL &&
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result != -EPROTONOSUPPORT) {
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log_print("connect %d try %d error %d", con->nodeid,
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con->retries, result);
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msleep(1000);
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lowcomms_connect_sock(con);
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}
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}
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/* Send workqueue function */
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static void process_send_sockets(struct work_struct *work)
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{
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@ -1701,11 +1585,15 @@ static void process_send_sockets(struct work_struct *work)
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dlm_midcomms_unack_msg_resend(con->nodeid);
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}
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if (con->sock == NULL) { /* not mutex protected so check it inside too */
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if (con->sock == NULL) {
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if (test_and_clear_bit(CF_DELAY_CONNECT, &con->flags))
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msleep(1000);
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dlm_proto_ops->connect_action(con);
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mutex_lock(&con->sock_mutex);
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dlm_connect(con);
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mutex_unlock(&con->sock_mutex);
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}
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if (!list_empty(&con->writequeue))
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send_to_sock(con);
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}
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@ -1899,6 +1787,43 @@ out:
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return result;
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}
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static int dlm_tcp_bind(struct socket *sock)
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{
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struct sockaddr_storage src_addr;
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int result, addr_len;
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/* Bind to our cluster-known address connecting to avoid
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* routing problems.
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*/
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memcpy(&src_addr, dlm_local_addr[0], sizeof(src_addr));
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make_sockaddr(&src_addr, 0, &addr_len);
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result = sock->ops->bind(sock, (struct sockaddr *)&src_addr,
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addr_len);
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if (result < 0) {
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/* This *may* not indicate a critical error */
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log_print("could not bind for connect: %d", result);
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}
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return 0;
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}
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static int dlm_tcp_connect(struct connection *con, struct socket *sock,
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struct sockaddr *addr, int addr_len)
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{
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int ret;
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ret = sock->ops->connect(sock, addr, addr_len, O_NONBLOCK);
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switch (ret) {
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case -EINPROGRESS:
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fallthrough;
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case 0:
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return 0;
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}
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return ret;
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}
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static int dlm_tcp_listen_validate(void)
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{
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/* We don't support multi-homed hosts */
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@ -1935,14 +1860,43 @@ static int dlm_tcp_listen_bind(struct socket *sock)
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static const struct dlm_proto_ops dlm_tcp_ops = {
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.name = "TCP",
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.proto = IPPROTO_TCP,
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.connect = dlm_tcp_connect,
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.sockopts = dlm_tcp_sockopts,
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.bind = dlm_tcp_bind,
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.listen_validate = dlm_tcp_listen_validate,
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.listen_sockopts = dlm_tcp_listen_sockopts,
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.listen_bind = dlm_tcp_listen_bind,
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.connect_action = tcp_connect_to_sock,
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.shutdown_action = dlm_tcp_shutdown,
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.eof_condition = tcp_eof_condition,
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};
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static int dlm_sctp_bind(struct socket *sock)
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{
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return sctp_bind_addrs(sock, 0);
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}
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static int dlm_sctp_connect(struct connection *con, struct socket *sock,
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struct sockaddr *addr, int addr_len)
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{
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int ret;
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/*
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* Make sock->ops->connect() function return in specified time,
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* since O_NONBLOCK argument in connect() function does not work here,
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* then, we should restore the default value of this attribute.
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*/
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sock_set_sndtimeo(sock->sk, 5);
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ret = sock->ops->connect(sock, addr, addr_len, 0);
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sock_set_sndtimeo(sock->sk, 0);
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if (ret < 0)
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return ret;
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if (!test_and_set_bit(CF_CONNECTED, &con->flags))
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log_print("successful connected to node %d", con->nodeid);
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return 0;
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}
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static int dlm_sctp_listen_validate(void)
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{
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if (!IS_ENABLED(CONFIG_IP_SCTP)) {
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@ -1969,10 +1923,13 @@ static void dlm_sctp_sockopts(struct socket *sock)
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static const struct dlm_proto_ops dlm_sctp_ops = {
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.name = "SCTP",
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.proto = IPPROTO_SCTP,
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.try_new_addr = true,
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.connect = dlm_sctp_connect,
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.sockopts = dlm_sctp_sockopts,
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.bind = dlm_sctp_bind,
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.listen_validate = dlm_sctp_listen_validate,
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.listen_sockopts = dlm_sctp_sockopts,
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.listen_bind = dlm_sctp_bind_listen,
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.connect_action = sctp_connect_to_sock,
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};
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int dlm_lowcomms_start(void)
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