diff --git a/src/volume.c b/src/volume.c
index e271b10..246b149 100644
--- a/src/volume.c
+++ b/src/volume.c
@@ -20,39 +20,43 @@ static size_t nr_vnode_table_orders
 
 static int node_init(struct ec3_volume *volume, struct ec3_vnode_group *n)
 {
-	memset(n, 0x0, sizeof *n);
+	memset(&n->g_nr_vnodes, 0x0, sizeof n->g_nr_vnodes);
+	memset(n->g_reserved, 0x0, sizeof n->g_reserved);
 
 	b_i32 *children;
 	unsigned int nr_children;
 
 	switch (volume->v_cluster_size) {
 	case EC3_CLUSTER_4K:
+		memset(&n->g_4k, 0x0, sizeof n->g_4k);
 		children = n->g_4k.g_child_offsets;
-		nr_children = EC3_VNODES_PER_GROUP_4K;
+		nr_children = EC3_VNODES_PER_GROUP_4K + 1;
 		break;
 	case EC3_CLUSTER_8K:
+		memset(&n->g_8k, 0x0, sizeof n->g_8k);
 		children = n->g_8k.g_child_offsets;
-		nr_children = EC3_VNODES_PER_GROUP_8K;
+		nr_children = EC3_VNODES_PER_GROUP_8K + 1;
 		break;
 	case EC3_CLUSTER_16K:
+		memset(&n->g_16k, 0x0, sizeof n->g_16k);
 		children = n->g_16k.g_child_offsets;
-		nr_children = EC3_VNODES_PER_GROUP_16K;
+		nr_children = EC3_VNODES_PER_GROUP_16K + 1;
 		break;
 	case EC3_CLUSTER_32K:
+		memset(&n->g_32k, 0x0, sizeof n->g_32k);
 		children = n->g_32k.g_child_offsets;
-		nr_children = EC3_VNODES_PER_GROUP_32K;
+		nr_children = EC3_VNODES_PER_GROUP_32K + 1;
 		break;
 	case EC3_CLUSTER_64K:
+		memset(&n->g_64k, 0x0, sizeof n->g_64k);
 		children = n->g_64k.g_child_offsets;
-		nr_children = EC3_VNODES_PER_GROUP_64K;
+		nr_children = EC3_VNODES_PER_GROUP_64K + 1;
 		break;
 	default:
 		return -1;
 	}
 
-	for (unsigned int i = 0; i < nr_children; i++) {
-		children[i] = b_i32_htob(EC3_INVALID_OFFSET);
-	}
+	memset(children, 0xFF, nr_children * sizeof *children);
 
 	return 0;
 }
@@ -127,6 +131,13 @@ static long tree_alloc_node(struct b_tree *p)
 	return (long)nr_clusters;
 }
 
+static void __node_init(struct b_tree *tree, b_tree_node *n)
+{
+	struct ec3_volume *volume = (struct ec3_volume *)tree;
+	struct ec3_vnode_group *node = (struct ec3_vnode_group *)n;
+	node_init(volume, node);
+}
+
 static unsigned long node_get_nr_entries(struct b_tree *tree, b_tree_node *n)
 {
 	struct ec3_vnode_group *node = (struct ec3_vnode_group *)n;
@@ -336,6 +347,7 @@ static const struct b_tree_ops vnode_table_ops = {
 	.tree_put_node = tree_put_node,
 	.tree_alloc_node = tree_alloc_node,
 
+	.node_init = __node_init,
 	.node_get_nr_entries = node_get_nr_entries,
 	.node_set_nr_entries = node_set_nr_entries,
 	.node_get_entry = node_get_entry,