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, 2 insertions, 0 deletions

diff --git a/xlators/features/changelog/src/changelog-ev-handle.c b/xlators/features/changelog/src/changelog-ev-handle.c
index caa5bbbadcd..38e127b7eb5 100644
--- a/xlators/features/changelog/src/changelog-ev-handle.c
+++ b/xlators/features/changelog/src/changelog-ev-handle.c
@@ -342,6 +342,7 @@ changelog_ev_dispatch (void *data)
 
         while (1) {
                 /* TODO: change this to be pthread cond based.. later */
+
                 tv.tv_sec = 1;
                 tv.tv_usec = 0;
                 select (0, NULL, NULL, NULL, &tv);
@@ -363,6 +364,7 @@ changelog_ev_dispatch (void *data)
                         gf_msg (this->name, GF_LOG_WARNING, 0,
                                 CHANGELOG_MSG_PUT_BUFFER_FAILED,
                                 "failed to put buffer after consumption");
+
         }
 
         return NULL;