linux-ext4 - xfstest-bld generic/018 fails due to e4defrag issue

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Message-ID: <CAGW2f1F1sL+if9zejgB92j0YDRjswvB3LG_dBR+pK3Yj4aQfHQ@mail.gmail.com>
Date:	Wed, 9 Apr 2014 01:37:04 -0400
From:	jon ernst <jonernst07@...il.com>
To:	"linux-ext4@...r.kernel.org List" <linux-ext4@...r.kernel.org>
Cc:	"Theodore Ts'o" <tytso@....edu>
Subject: xfstest-bld generic/018 fails due to e4defrag issue

Hi,
running latest xfstest-bld with latest ext4 kernel "dev"
branch(ad6599ab3a).I always get generic/018 failed.
Then I took closer look and found out this issue.

After run this:

fragfile="/vdf/testfile"
for I in `seq 9 -1 0`; do
    dd if=/dev/zero of=$fragfile bs=4k count=1 conv=notrunc seek=$I oflag=sync
done


Even though the file does exist. e4defrag complains about:

(this output comes from kvm guest machine)
> e4defrag -v /vdf/testfile
Can't get super block info: Success
"/vdf/testfile"

Is this a known issue or something I did wrong.

Thank you!

Jon
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