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, 31 insertions, 0 deletions

diff --git a/xlators/features/bit-rot/src/stub/bit-rot-stub.c b/xlators/features/bit-rot/src/stub/bit-rot-stub.c
index 895e7690a5e..b8a34422522 100644
--- a/xlators/features/bit-rot/src/stub/bit-rot-stub.c
+++ b/xlators/features/bit-rot/src/stub/bit-rot-stub.c
@@ -10,6 +10,7 @@
 
 #include <ctype.h>
 #include <sys/uio.h>
+#include <signal.h>
 
 #include "glusterfs.h"
 #include "xlator.h"
@@ -212,6 +213,35 @@ out:
         return ret;
 }
 
+
+int
+notify (xlator_t *this, int event, void *data, ...)
+{
+        br_stub_private_t *priv = NULL;
+
+        if (!this)
+                return 0;
+
+        priv = this->private;
+        if (!priv)
+                return 0;
+
+        switch (event) {
+        case GF_EVENT_CLEANUP:
+                if (priv->signth) {
+                        (void) gf_thread_cleanup_xint (priv->signth);
+                        priv->signth = 0;
+                }
+                if (priv->container.thread) {
+                        (void) gf_thread_cleanup_xint (priv->container.thread);
+                        priv->container.thread = 0;
+                }
+                break;
+        }
+        default_notify (this, event, data);
+        return 0;
+}
+
 void
 fini (xlator_t *this)
 {
@@ -832,6 +862,7 @@ br_stub_signth (void *arg)
 
         THIS = this;
         while (1) {
+
                 pthread_mutex_lock (&priv->lock);
                 {
                         while (list_empty (&priv->squeue))