core: fix initialization of disjoint xlator graph

if graph has disjoint subgraphs, send GF_EVENT_PARENT_UP to every top node

Signed-off-by: Anand V. Avati <avati@blackhole.gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 272 (Server backend storage hang should not cause the mount point to hang)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=272

2 files changed, 28 insertions, 1 deletions

diff --git a/glusterfsd/src/glusterfsd.c b/glusterfsd/src/glusterfsd.c
index d3f1be02867..14627f0af94 100644
--- a/glusterfsd/src/glusterfsd.c
+++ b/glusterfsd/src/glusterfsd.c
@@ -607,6 +607,31 @@ _xlator_graph_init (xlator_t *xl)
 }
 
 int
+glusterfs_graph_parent_up (xlator_t *graph)
+{
+        xlator_t *trav = NULL;
+        int       ret = -1;
+
+        trav = graph;
+
+        while (trav->prev)
+                trav = trav->prev;
+
+        while (trav) {
+                if (!xlator_has_parent (trav)) {
+                        ret = trav->notify (trav, GF_EVENT_PARENT_UP, trav);
+                }
+
+                if (ret)
+                        break;
+
+                trav = trav->next;
+        }
+
+        return ret;
+}
+
+int
 glusterfs_graph_init (xlator_t *graph, int fuse)
 {
         volume_opt_list_t *vol_opt = NULL;
@@ -1366,7 +1391,7 @@ main (int argc, char *argv[])
         }
 
         /* Send PARENT_UP notify to all the translators now */
-        graph->notify (graph, GF_EVENT_PARENT_UP, ctx->graph);
+        glusterfs_graph_parent_up (graph);
 
         gf_log ("glusterfs", GF_LOG_NORMAL, "Successfully started");
 
diff --git a/libglusterfs/src/xlator.h b/libglusterfs/src/xlator.h
index d0c8ae83643..b8222911a59 100644
--- a/libglusterfs/src/xlator.h
+++ b/libglusterfs/src/xlator.h
@@ -926,6 +926,8 @@ struct _xlator {
 	void             *private;
 };
 
+#define xlator_has_parent(xl) (xl->parents != NULL)
+
 int validate_xlator_volume_options (xlator_t *xl, volume_option_t *opt);
 
 int32_t xlator_set_type (xlator_t *xl, const char *type);