USED
.f_bfree = (TOTAL - USED) / BSIZE,
.f_bavail = (TOTAL - USED) / BSIZE,
.f_bfree = (TOTAL - USED) / BSIZE,
.f_bresvd = (TOTAL - USED) / BSIZE - AVAIL / BSIZE,
.f_bfree = (TOTAL - USED) / BSIZE,
.f_bresvd = (TOTAL - USED) / BSIZE - AVAIL / BSIZE,
.f_bfree = TOTAL - USED,
.f_bresvd = TOTAL - USED - AVAIL,