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, 7 insertions, 3 deletions

diff --git a/xlators/protocol/server/src/server.h b/xlators/protocol/server/src/server.h
index 0b37eb1414a..09a2d74ff2b 100644
--- a/xlators/protocol/server/src/server.h
+++ b/xlators/protocol/server/src/server.h
@@ -73,6 +73,12 @@ struct _volfile_ctx {
         uint32_t             checksum;
 };
 
+struct _child_status {
+        struct list_head status_list;
+        char *name;
+        gf_boolean_t child_up;
+
+};
 struct server_conf {
         rpcsvc_t               *rpc;
         struct rpcsvc_config    rpc_conf;
@@ -101,9 +107,7 @@ struct server_conf {
                                             * in case if volume set options
                                             * (say *.allow | *.reject) are
                                             * tweeked */
-        gf_boolean_t            child_up; /* Set to true, when child is up, and
-                                           * false, when child is down */
-
+        struct _child_status    *child_status;
         gf_lock_t               itable_lock;
 };
 typedef struct server_conf server_conf_t;