RF_PGMASK         104 dev/raidframe/rf_general.h #define	RF_BLIP(x)		(NBPG - (RF_UL(x) & RF_PGMASK))	/*
RF_PGMASK         108 dev/raidframe/rf_general.h #define	RF_PAGE_ALIGNED(x)	((RF_UL(x) & RF_PGMASK) == 0)