Finding out how fragmented an ext3 journal is

["Adam Warner" <lists@consulting.net.nz>]

Hi all,

Some advice is listed here on how to find out how fragmented an ext3
journal is (a small concern for those who have upgraded a heavily
fragmented ext2 partition to ext3):
https://listman.redhat.com/pipermail/ext3-users/2001-November/002152.html

One is told: `use "debugfs" to find the inode number of the journal, and
then stat <inode>'.

I've just used tune2fs -l /dev/hda1 to find out the journal inode number.
But how do you supply an inode number to stat? It appears you can only
supply a file or filesystem, and the ext3 journal occupies a hidden inode
(it doesn't exist as /.journal).

Thanks,
Adam