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ext4: How to account for the filesystem space?

After googleing a little I find that ext4 reserve 5% for root: Reserved space for root on a filesystem - why?, ext2/3/4 reserved blocks percentage purpose. And if I use tune2fs to set the number of reserved blocks to 0, it will take them back. But I use that code on a 100MB volume and get half of the reserving space, it was 10.5MB, and after setting to 0 the used space became 5.5MB. Why is the used space still not zero?

I used the following command to set the reserved space:

tune2fs -m 0 /dev/mapper/truecrypt1
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marked as duplicate by Gilles, jasonwryan, Mat, Caleb, Chris Down Nov 17 '12 at 23:36

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What command did you use to view the reserved space? Remember ext4 needs some room to live in, too. You may want to try /sbin/tune2fs -l /dev/mapper/truecrypt1 and look at the Reserved block count line. –  Michael Kjörling Nov 16 '12 at 9:24
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There is still space required for the filesystem's internal usage (superblocks, etc). This is merely the way ext4 works and defines "used space".

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