Support backend reference counting

src/vmod_all_healthy.c

@@ -96,13 +96,18 @@ vmod_director__init(VRT_CTX,
 }
 
 VCL_VOID
-vmod_director__fini(struct vmod_all_healthy_director **dp) {
+vmod_director__fini(struct vmod_all_healthy_director **dp)
+{
 	struct vmod_all_healthy_director *d = *dp;
+	int i;
 
 	*dp = NULL;
 	if (d == NULL)
 		return;
 	CHECK_OBJ(d, VMOD_ALL_HEALTHY_DIRECTOR_MAGIC);
+	for (i = 0; i < d->nconsider; i++)
+		VRT_Assign_Backend(&d->consider[i], NULL);
+	VRT_Assign_Backend(&d->backend, NULL);
 	VRT_DelDirector(&d->dir);
 	free(TRUST_ME(d->consider));
 	FREE_OBJ(d);
@@ -145,9 +150,9 @@ vmod_director_consider(VRT_CTX,
 		d->spcconsider = i;
 		d->consider = n;
 	}
-	d->consider[d->nconsider++] = b;
+	VRT_Assign_Backend(&d->consider[d->nconsider++], b);
 	if (d->backend == NULL)
-		d->backend = b;
+		VRT_Assign_Backend(&d->backend, b);
 }
 
 VCL_VOID
@@ -163,7 +168,7 @@ vmod_director_set_backend(VRT_CTX,
 		return;
 	}
 
-	d->backend = b;
+	VRT_Assign_Backend(&d->backend, b);
 }
 
 VCL_BACKEND