[Drbd-dev] DRBD-8: handling of concurrent writes with two primaries

[Graham, Simon]

OK, so I was slightly wrong here:

> 2. If the UNIQE flag is set, then I don't see how the partner node
will
> make any progress - you never send an Ack and do not disconnect - if
> the
> partner also sees the conflict then he will do the Discard msg
> processing, but I don't think this is guaranteed - I'm probably
missing
> something, but if the partner gets the request and _then_ issues a
> write
> to the same location, I don't think it will do the right thing... the
> partner will simply discard and you are left hanging...
> 

Since I've found the code that checks for collision on the write side
and adds the info to the list. I still think the other issue applies
(Ack and Data can be re-ordered which means there are cases where you
wont wait for the outstanding req to complete when you really should)...

Simon