int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, pgoff_t index);
struct lu_object *vvp_object_alloc(const struct lu_env *env,
int vvp_page_init(const struct lu_env *env, struct cl_object *obj,
struct cl_page *page, pgoff_t index);
struct lu_object *vvp_object_alloc(const struct lu_env *env,