static void null_destroy(struct vm_store *store)Frees this stores space.static off_t null_commit(struct vm_store *store, off_t size)Sets committed size to size and returns it.static int null_has_page(struct vm_store *store, off_t offset)returns 1.static ssize_t null_read(struct vm_store *store, off_t offset, iovecs *vecs)Returns -1.static ssize_t null_write(struct vm_store *store, off_t offset, iovecs *vecs)Returns -1.static int null_fault(struct vm_store *store, struct vm_address_space *aspace, off_t offset)Returns a Fatal page fault error.vm_store *vm_store_create_null(void)Creates an empty vm_store struct.