linux-ext4 - tune2fs -I seems dangerous

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Date:	Thu, 04 Dec 2008 16:26:47 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	ext4 development <linux-ext4@...r.kernel.org>
Subject: tune2fs -I seems dangerous

As a small experiment...

dd if=/dev/zero of=fsfile bs=1M count=16
mkfs.ext4 -F -I 128 fsfile
mkdir -p mnt
mount -o loop fsfile mnt
for I in `seq 1 4096`; do echo $I > mnt/file.$I; done
umount mnt
tune2fs -I 256 fsfile
e2fsck -fy fsfile

... this yields 10031 lines of fsck output, and results in about 38% of
the files that were on the filesystem going missing.

I don't have the strong sense that tune2fs -I has been shaken out at
all; should it be shipping as a useable option?

Thanks,
-Eric

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