libceph: define and use an explicit CONNECTED state
Alex Elder [Wed, 23 May 2012 19:35:23 +0000 (14:35 -0500)]
(cherry picked from commit e27947c767f5bed15048f4e4dad3e2eb69133697)

There is no state explicitly defined when a ceph connection is fully
operational.  So define one.

It's set when the connection sequence completes successfully, and is
cleared when the connection gets closed.

Be a little more careful when examining the old state when a socket
disconnect event is reported.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Sage Weil <sage@inktank.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

include/linux/ceph/messenger.h
net/ceph/messenger.c

index f624b75..6a00acc 100644 (file)
@@ -120,6 +120,7 @@ struct ceph_msg_pos {
  */
 #define CONNECTING     1
 #define NEGOTIATING    2
+#define CONNECTED      5
 #define STANDBY                8  /* no outgoing messages, socket closed.  we keep
                            * the ceph_connection around to maintain shared
                            * state with the peer. */
index aa911e2..2a78d5c 100644 (file)
@@ -463,6 +463,7 @@ void ceph_con_close(struct ceph_connection *con)
             ceph_pr_addr(&con->peer_addr.in_addr));
        clear_bit(NEGOTIATING, &con->state);
        clear_bit(CONNECTING, &con->state);
+       clear_bit(CONNECTED, &con->state);
        clear_bit(STANDBY, &con->state);  /* avoid connect_seq bump */
        set_bit(CLOSED, &con->state);
 
@@ -1564,6 +1565,7 @@ static int process_connect(struct ceph_connection *con)
                }
                clear_bit(NEGOTIATING, &con->state);
                clear_bit(CONNECTING, &con->state);
+               set_bit(CONNECTED, &con->state);
                con->peer_global_seq = le32_to_cpu(con->in_reply.global_seq);
                con->connect_seq++;
                con->peer_features = server_feat;
@@ -2114,6 +2116,7 @@ more:
                        prepare_read_ack(con);
                        break;
                case CEPH_MSGR_TAG_CLOSE:
+                       clear_bit(CONNECTED, &con->state);
                        set_bit(CLOSED, &con->state);   /* fixme */
                        goto out;
                default:
@@ -2190,11 +2193,13 @@ static void con_work(struct work_struct *work)
        mutex_lock(&con->mutex);
 restart:
        if (test_and_clear_bit(SOCK_CLOSED, &con->flags)) {
-               if (test_and_clear_bit(CONNECTING, &con->state)) {
+               if (test_and_clear_bit(CONNECTED, &con->state))
+                       con->error_msg = "socket closed";
+               else if (test_and_clear_bit(CONNECTING, &con->state)) {
                        clear_bit(NEGOTIATING, &con->state);
                        con->error_msg = "connection failed";
                } else {
-                       con->error_msg = "socket closed";
+                       con->error_msg = "unrecognized con state";
                }
                goto fault;
        }