glusterd: Fix management encryption issues with GlusterD

Management encryption was enabled incorrectly in GlusterD leading to
issues of cluster deadlocks. This has been fixed with this commit. The
fix is in two parts,

1. Correctly enable encrytion for the TCP listener in GlusterD and
re-enable own-threads for encrypted connections.
  Without this, GlusterD could try to esatblish the blocking SSL
  connects in the epoll thread, for eg. when handling friend updates,
  which could lead to cluster deadlocks.

2. Explicitly enable encryption for outgoing peer connections.
  Without enabling encryption explicitly for outgoing connections was
  causing SSL socket events to be handled in the epoll thread. Some
  events, like disconnects during peer detach, could lead to connection
  attempts to happen in the epoll thread, leading to deadlocks again.

Change-Id: I438c2b43f7b1965c0e04d95c000144118d36272c
BUG: 1240564
Signed-off-by: Kaushal M <kaushal@redhat.com>
Reviewed-on: http://review.gluster.org/11559
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Krishnan Parthasarathi <kparthas@redhat.com>

1 files changed, 5 insertions, 8 deletions

diff --git a/xlators/mgmt/glusterd/src/glusterd.c b/xlators/mgmt/glusterd/src/glusterd.c
index 1c4c613027d..9a8759f2fc3 100644
--- a/xlators/mgmt/glusterd/src/glusterd.c
+++ b/xlators/mgmt/glusterd/src/glusterd.c
@@ -1585,19 +1585,16 @@ init (xlator_t *this)
                 goto out;
         }
 
+        /* Enable encryption for the TCP listener is management encryption is
+         * enabled
+         */
         if (this->ctx->secure_mgmt) {
-                /*
-                 * The socket code will turn on SSL based on the same check,
-                 * but that will by default turn on own-thread as well and
-                 * we're not multi-threaded enough to handle that.  Thus, we
-                 * override the value here.
-                 */
                 ret = dict_set_str (this->options,
-                                    "transport.socket.own-thread", "off");
+                                    "transport.socket.ssl-enabled", "on");
                 if (ret != 0) {
                         gf_msg (this->name, GF_LOG_ERROR, 0,
                                 GD_MSG_DICT_SET_FAILED,
-                                "failed to clear own-thread");
+                                "failed to set ssl-enabled in dict");
                         goto out;
                 }
                 /*