fat_od_fsi_t
fsinfo_disk = (fat_od_fsi_t *)(bp->b_un.b_addr);
fsinfo_disk = (fat_od_fsi_t *)(bp->b_un.b_addr);
((fat_od_fsi_t *)(fsi))->fsi_leadsig == FSI_LEADSIG && \
((fat_od_fsi_t *)(fsi))->fsi_strucsig == FSI_STRUCSIG && \
((fat_od_fsi_t *)(fsi))->fsi_trailsig == FSI_TRAILSIG)