glusterfs: Not able to mount running volume after enable brick mux and stopped any volume

Problem: After enabled brick mux if any volume has down and then try ot run mount
         with running volume , mount command is hung.

Solution: After enable brick mux server has shared one data structure server_conf
          for all associated subvolumes.After down any subvolume in some
          ungraceful manner (remove brick directory) posix xlator sends
          GF_EVENT_CHILD_DOWN event to parent xlatros and server notify
          updates the child_up to false in server_conf.When client is trying
          to communicate with server through mount it checks conf->child_up
          and it is FALSE so it throws message "translator are not yet ready".
          From this patch updated structure server_conf to save child_up status
          for xlator wise. Another improtant correction from this patch is
          cleanup threads from server side xlators after stop the volume.

BUG: 1453977
Change-Id: Ic54da3f01881b7c9429ce92cc569236eb1d43e0d
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>
Reviewed-on: https://review.gluster.org/17356
Smoke: Gluster Build System <jenkins@build.gluster.org>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra Talur <rtalur@redhat.com>
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>

1 files changed, 26 insertions, 0 deletions

diff --git a/xlators/features/changetimerecorder/src/changetimerecorder.c b/xlators/features/changetimerecorder/src/changetimerecorder.c
index 574b627a825..1811cec420f 100644
--- a/xlators/features/changetimerecorder/src/changetimerecorder.c
+++ b/xlators/features/changetimerecorder/src/changetimerecorder.c
@@ -2297,6 +2297,32 @@ out:
         return 0;
 }
 
+int
+notify (xlator_t *this, int event, void *data, ...)
+{
+
+       gf_ctr_private_t *priv = NULL;
+       int               ret  = 0;
+
+       priv = this->private;
+
+       if (!priv)
+               goto out;
+
+       if (event == GF_EVENT_CLEANUP) {
+               if (fini_db (priv->_db_conn)) {
+                       gf_msg (this->name, GF_LOG_WARNING, 0,
+                                CTR_MSG_CLOSE_DB_CONN_FAILED, "Failed closing "
+                                "db connection");
+               }
+       } else  {
+               ret = default_notify (this, event, data);
+       }
+out:
+      return ret;
+
+}
+
 int32_t
 mem_acct_init (xlator_t *this)
 {