OBJPC_INVAL
flags |= invalidate ? OBJPC_INVAL : 0;
pagerflags = (flags & (OBJPC_SYNC | OBJPC_INVAL)) ?
pagerflags |= (flags & OBJPC_INVAL) ? OBJPC_INVAL : 0;
if (flags & (OBJPC_SYNC | OBJPC_INVAL))
ioflags |= (flags & OBJPC_INVAL) ? IO_INVAL: 0;