FLUSH_COND_STABLE
FLUSH_COND_STABLE);
switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
case FLUSH_COND_STABLE:
if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
ret = FLUSH_COND_STABLE;