libceph: fix msgr standby handling

The standby logic used to be pretty dependent on the work requeueing
behavior that changed when we switched to WQ_NON_REENTRANT.  It was also
very fragile.

Restructure things so that:
 - We clear WRITE_PENDING when we set STANDBY.  This ensures we will
   requeue work when we wake up later.
 - con_work backs off if STANDBY is set.  There is nothing to do if we are
   in standby.
 - clear_standby() helper is called by both con_send() and con_keepalive(),
   the two actions that can wake us up again.  Move the connect_seq++
   logic here.

Signed-off-by: Sage Weil <sage@newdream.net>

diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 3252ea9..05f3578 100644 (file)
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -1712,14 +1712,6 @@ more:
 
        /* open the socket first? */
        if (con->sock == NULL) {
-               /*
-                * if we were STANDBY and are reconnecting _this_
-                * connection, bump connect_seq now.  Always bump
-                * global_seq.
-                */
-               if (test_and_clear_bit(STANDBY, &con->state))
-                       con->connect_seq++;
-
                prepare_write_banner(msgr, con);
                prepare_write_connect(msgr, con, 1);
                prepare_read_banner(con);
@@ -1962,6 +1954,10 @@ static void con_work(struct work_struct *work)
                }
        }
 
+       if (test_bit(STANDBY, &con->state)) {
+               dout("con_work %p STANDBY\n", con);
+               goto done;
+       }
        if (test_bit(CLOSED, &con->state)) { /* e.g. if we are replaced */
                dout("con_work CLOSED\n");
                con_close_socket(con);
@@ -2022,6 +2018,8 @@ static void ceph_fault(struct ceph_connection *con)
         * the connection in a STANDBY state */
        if (list_empty(&con->out_queue) &&
            !test_bit(KEEPALIVE_PENDING, &con->state)) {
+               dout("fault %p setting STANDBY clearing WRITE_PENDING\n", con);
+               clear_bit(WRITE_PENDING, &con->state);
                set_bit(STANDBY, &con->state);
        } else {
                /* retry after a delay. */
@@ -2117,6 +2115,19 @@ void ceph_messenger_destroy(struct ceph_messenger *msgr)
 }
 EXPORT_SYMBOL(ceph_messenger_destroy);
 
+static void clear_standby(struct ceph_connection *con)
+{
+       /* come back from STANDBY? */
+       if (test_and_clear_bit(STANDBY, &con->state)) {
+               mutex_lock(&con->mutex);
+               dout("clear_standby %p and ++connect_seq\n", con);
+               con->connect_seq++;
+               WARN_ON(test_bit(WRITE_PENDING, &con->state));
+               WARN_ON(test_bit(KEEPALIVE_PENDING, &con->state));
+               mutex_unlock(&con->mutex);
+       }
+}
+
 /*
  * Queue up an outgoing message on the given connection.
  */
@@ -2149,6 +2160,7 @@ void ceph_con_send(struct ceph_connection *con, struct ceph_msg *msg)
 
        /* if there wasn't anything waiting to send before, queue
         * new work */
+       clear_standby(con);
        if (test_and_set_bit(WRITE_PENDING, &con->state) == 0)
                queue_con(con);
 }
@@ -2214,6 +2226,8 @@ void ceph_con_revoke_message(struct ceph_connection *con, struct ceph_msg *msg)
  */
 void ceph_con_keepalive(struct ceph_connection *con)
 {
+       dout("con_keepalive %p\n", con);
+       clear_standby(con);
        if (test_and_set_bit(KEEPALIVE_PENDING, &con->state) == 0 &&
            test_and_set_bit(WRITE_PENDING, &con->state) == 0)
                queue_con(con);