"There is a myth that 'linux filesystems don't need to be
defragmented.' As it may be truth in general, it still can be
dispelled by a simple script, which creates a certain number of
directories and in each of them creates and deletes a certain
number of files--in, let's say, two passes. So, does your
filesystem need defragmentation...?
"Let's make an experiment--we're going to start with creating a
filesystem image..."