allfiles_scan_exclusive
allfiles_scan_exclusive(fdrevoke_check_callback, &info);
allfiles_scan_exclusive(unp_gc_clearmarks, NULL);
allfiles_scan_exclusive(unp_gc_checkmarks, &info);
allfiles_scan_exclusive(unp_gc_checkrefs, &info);
void allfiles_scan_exclusive(int (*callback)(struct file *, void *), void *data);