zone_t
zone_t zone;
zone_t z = fs2h32(fp->f_di.mdi_zone[zone]);
zone = (zone_t)ind_block_num;
fs->mfs_firstdatazone = (zone_t) fs->mfs_firstdatazone_old;
#define ZONE_NUM_SIZE sizeof(zone_t) /* # bytes in zone */
#define NO_ZONE ((zone_t) 0) /* absence of a zone number */
zone_t mdi_zone[NR_TZONES]; /* zone numbers for direct, ind, and
zone_t mfs_zones; /* number of zones (replaces s_nzones in V2) */
zone_t mfs_firstdatazone; /* number of first data zone (big) */