again:
	nfiles_snap = openfiles + nfiles_slack;	/* some slack */
	extra_ref = malloc(nfiles_snap * sizeof(struct file *), M_TEMP,
	    M_WAITOK);
	sx_slock(&filelist_lock);
	if (nfiles_snap < openfiles) {
		sx_sunlock(&filelist_lock);
		free(extra_ref, M_TEMP);
		nfiles_slack += 20;
		goto again;
	}