We had a bug where we were creating extent lengths that were rounded up
to the size of the packed extent items instead of being limited by
i_size. As it happens the last setattr_more test would have found it if
I'd actually done the math to check that the extent length was correct.
We add an explicit offline blocks count test because that's what lead us
to notice that the offline extent length was wrong.
Signed-off-by: Zach Brown <zab@versity.com>
63cccfa582