Finding out how fragmented an ext3 journal is
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):
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).