From: Eric Sandeen <sandeen@redhat.com>
Subject: debugfs fill_bgs command?
Date: Wed, 11 Apr 2007 15:17:26 -0500
Message-ID: <461D4256.6020509@redhat.com>
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To: ext4 development <linux-ext4@vger.kernel.org>
Sender: linux-ext4-owner@vger.kernel.org

I was wondering if others think it would be useful to have a "fill_bgs"
command in debugfs; this would (minimally) mark the lower X bgs as full
for both inodes & blocks (possibly either/or), to allow testing the
higher block groups.  I'm using a hacked up version of this to do a
little ext3 testing above 8T.  Given that this would really only be a
testing option in nature, would it be accepted into e2fsprogs?  I'd
probably need some sort of "unfill" command as well, to put the bg
counters back where they should be; probably by actually reading the
bitmaps.  This way fsck would still find a consistent filesystem...

I had originally written a set_bg_field function too, to go with inode &
sb variants, though for marking the first few thousand bg's it was going
to get a bit tedious... :)

Thoughts?

Thanks,
-Eric