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, 16 insertions, 0 deletions

diff --git a/xlators/features/changelog/src/changelog.c b/xlators/features/changelog/src/changelog.c
index 697e8ca7b11..20af188d0d4 100644
--- a/xlators/features/changelog/src/changelog.c
+++ b/xlators/features/changelog/src/changelog.c
@@ -21,6 +21,7 @@
 #include "changelog-messages.h"
 
 #include <pthread.h>
+#include <signal.h>
 
 #include "changelog-rpc.h"
 #include "errno.h"
@@ -2098,6 +2099,7 @@ notify (xlator_t *this, int event, void *data, ...)
         int                     ret             = 0;
         int                     ret1            = 0;
         struct list_head        queue           = {0, };
+        int                     i               = 0;
 
         INIT_LIST_HEAD (&queue);
 
@@ -2105,6 +2107,20 @@ notify (xlator_t *this, int event, void *data, ...)
         if (!priv)
                 goto out;
 
+        if (event == GF_EVENT_CLEANUP) {
+                if (priv->connector) {
+                        (void) gf_thread_cleanup_xint (priv->connector);
+                        priv->connector = 0;
+                }
+
+                for (; i < NR_DISPATCHERS; i++) {
+                        if (priv->ev_dispatcher[i]) {
+                                (void) gf_thread_cleanup_xint (priv->ev_dispatcher[i]);
+                                priv->ev_dispatcher[i] = 0;
+                        }
+               }
+        }
+
         if (event == GF_EVENT_TRANSLATOR_OP) {
 
                 dict = data;