Hello everybody,

'Made some tests.

This makes the ext4 magic flow:

 * Boot an ext4 system. Mount an ext3 partition as ext4 and perform a
heavy task in that partition.

 * Boot an ext4 system. Mount an ext4 partition... everything's fine, of
course.

And this does not work:

 * Boot an ext4 system. Mount an ext3 partition as ext3. The heavy task
will make everything unpleasant.

 * Boot an ext3 partition yet now mentioned as ext4 in its /etc/fstab.
Okay, I forgot to verify if its /etc/mtab mentioned it as mounted as
ext4 and I can no more redo the test because I erased that partition...
My bad.

Mounting the ext3 partition as ext4 yielded no problem afterwards. It
could be mounted as ext3 back again. No warranties on anything yet the
fact is I encountered no single problem while playing back and forth
between ext3 and ext4. I did not try to transform an ext3 partition into
an ext4 (I wished to, but didn't find the method within 30 seconds).

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