[Ocfs2-devel] Patch request reviews, for node reconnecting with other nodes whose node number is little than local, thanks a lot.

[Guozhonghua <guozhonghua@h3c.com>]

Hi, everyone,
I had have a test with eight nodes and find one issue.

The Linux kernel version is 3.2.40.

As I migrate processes from one node to another, those processes is open the files on the OCFS2 storage. Sometime one node shutdown TCP connection with that node whose node number is larger because long time without any message from it.
As the TCP connection shutdown, the node whose number larger did not restart connection to the node, whose number is little and shutdown the TCP connection.
So I review the code of the cluster and find it may be a bug.

I changed it and have a test.

Is there anybody having time to view and make sure that those changes is correct?
Thanks a lot.

The diff file is as below, of the file is /cluster/tcp.c:

root at gzh-dev:/home/dev/test_replace/ocfs2_ko# diff -pu ocfs2-ko-3.2-compare/cluster/tcp.c ocfs2-ko-3.2/cluster/tcp.c
--- ocfs2-ko-3.2-compare/cluster/tcp.c  2012-10-29 19:33:19.534200000 +0800
+++ ocfs2-ko-3.2/cluster/tcp.c        2013-05-08 09:33:16.386277310 +0800
@@ -1699,6 +1698,10 @@ static void o2net_start_connect(struct w
      if (ret == -EINPROGRESS)
              ret = 0;
+      /** Reset the timeout with 0 to avoid connection again */
+      if (ret == 0) {
+              atomic_set(&nn->nn_timeout, 0);
+      }
out:
      if (ret) {
              printk(KERN_NOTICE "o2net: Connect attempt to " SC_NODEF_FMT
@@ -1725,6 +1728,11 @@ static void o2net_connect_expired(struct
       spin_lock(&nn->nn_lock);
      if (!nn->nn_sc_valid) {
+              /** trigger reconnect with other nodes whose node number is little than local
+              *  while they are still able to access the storage
+              */
+              atomic_set(&nn->nn_timeout, 1);
+
               printk(KERN_NOTICE "o2net: No connection established with "
                     "node %u after %u.%u seconds, giving up.\n",
                   o2net_num_from_nn(nn),
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