NS_RAW_OFFSET
pos = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
off = (loff_t)NS_RAW_OFFSET(ns) + ns->regs.off;
num, NS_RAW_OFFSET(ns) + ns->regs.off);
ns->regs.row, NS_RAW_OFFSET(ns));
num, ns->regs.row, ns->regs.column, NS_RAW_OFFSET(ns) + ns->regs.off);
#define NS_RAW_OFFSET_OOB(ns) (NS_RAW_OFFSET(ns) + ns->geom.pgsz)