if (filed_fileinfo_fdcache_size != 0) {
		/*
		 * We have to make a duplicate FD, because once we release the cache
		 * mutex, the file descriptor may be closed
		 */
		fd = dup(cache->fd);
		if (fd < 0) {
			close(cache->fd);
			cache->fd = -1;

			pthread_mutex_unlock(&cache->mutex);

			return(NULL);
		}

		buffer->fd = fd;
		buffer->len = cache->len;