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Date:	Sat, 23 May 2015 17:18:41 -0400
From:	Phillip Susi <psusi@...ntu.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: resize2fs minimum size wrong

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So I have a filesystem with nothing beyond group 16 used ( including
metadata ), so it should be able to shrink to ~524288 blocks, yet
resize2fs claims the minimum size is 770083 blocks.  Resize debug output
follows:

resize2fs 1.43-WIP (29-Mar-2015)
fs has 52108 inodes, 7 groups required.
fs requires 492169 data blocks.
With 7 group(s), we have 218842 blocks available.
Added 9 extra group(s), blks_needed 492169, data_blocks 513754,
last_start 224238
Last group's overhead is 10534
Need 267931 data blocks in last group
Final size of last group is 278465
Estimated blocks needed: 769985
Extents safety margin: 98
Estimated minimum size of the filesystem: 770083

So clearly it thinks only 16 block groups are enough, then somehow leaps
from there to 24.

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