ntm_spc
#define ntfs_cntobn(cn) (daddr_t)((cn) * (ntmp->ntm_spc))
#define ntfs_cntodoff(cn) ((off_t)(cn) * (ntmp)->ntm_spc * (ntmp)->ntm_bps)
#define ntfs_cntob(cn) ((off_t)(cn) * (ntmp)->ntm_spc * (ntmp)->ntm_bps)
#define ntfs_btocn(off) (cn_t)((off) / ((ntmp)->ntm_spc * (ntmp)->ntm_bps))
#define ntfs_btocl(off) (cn_t)((off + ntfs_cntob(1) - 1) / ((ntmp)->ntm_spc * (ntmp)->ntm_bps))
#define ntfs_btocnoff(off) (off_t)((off) % ((ntmp)->ntm_spc * (ntmp)->ntm_bps))
if (fhp->fh_foff >= ntmp->ntm_spc * ntmp->ntm_mftrecsz * ntmp->ntm_bps) {
ntmp->ntm_bpmftrec = ntmp->ntm_spc * cpr;
ntmp->ntm_bps,ntmp->ntm_spc,ntmp->ntm_bootfile.bf_media,
sbp->f_iosize = ntmp->ntm_bps * ntmp->ntm_spc;
sbp->f_bfree = sbp->f_bavail = ntmp->ntm_cfree * ntmp->ntm_spc;
vap->va_blocksize = ip->i_mp->ntm_spc * ip->i_mp->ntm_bps;