Hello Mathieu,

I found that by default reiser4 still relies on a block layer feature,
which is not longer supported. This is so-called "barriers". And yes,
on the power outage bad things are bound to happen. However, it
is up to bad luck.

The attached patch removes the rest of block barriers support in
reiser4. So, now we honestly wait for IO completion of wandered
blocks (overwrite set) before submitting a journal header (journal
footer).

Not sure if it will address your problem though. Also, data corruption
after rw-mounting of checked (rebuild-fs) partition is still a concern.

Thanks,
Edward.