XEN_BSIZE
CTASSERT(XEN_BSIZE == DEV_BSIZE);
req->sector_number = (bp->b_rawblkno * sc->sc_secsize / XEN_BSIZE) +
KASSERT(reqseg->last_sect < (PAGE_SIZE / XEN_BSIZE));
req->sector_number = bp->b_rawblkno * sc->sc_secsize / XEN_BSIZE;
KASSERT(reqseg->last_sect < (PAGE_SIZE / XEN_BSIZE));
sc->sc_sectors = sectors * (uint64_t)XEN_BSIZE / sc->sc_secsize;