FL_BUF_RESUME
if (__predict_false(fl->flags & FL_BUF_RESUME)) {
fl->flags &= ~FL_BUF_RESUME;
fl->flags |= FL_BUF_RESUME;
__predict_true((fl->flags & FL_BUF_RESUME) == 0)) {
MPASS(!(fl->flags & FL_BUF_RESUME));
if (fl->flags & FL_BUF_RESUME) {
fl->flags &= ~FL_BUF_RESUME;