fatentry
int fatentry(int function, struct msdosfsmount *pmp, u_long cluster, u_long *oldcontents, u_long newcontents);
error = fatentry(FAT_GET_AND_SET, pmp, eofentry,
error = fatentry(FAT_SET, pmp,
error = fatentry(FAT_GET_AND_SET, pmp, cluster, &oldcn, MSDOSFSFREE);
fatStatus = B_FROM_POSIX_ERROR(fatentry(FAT_GET, fatVolume, cluster, &cluster, 0));
status = B_FROM_POSIX_ERROR(fatentry(FAT_GET, fatVolume, cluster, &cluster, 0));
status = B_FROM_POSIX_ERROR(fatentry(FAT_GET, fatVolume, cluster, &cluster, 0));
status = fatentry(FAT_GET, fatVolume, resultCluster, &resultCluster, 0);