[Drbd-dev] [PATCH] DRBD8.0: Fix to ensure we dont send barrier when connecting

[Graham, Simon]

The new "send-barrier-as-soon-as-possible" functionality has a small
problem in that the CREATE_BARRIER flag can get set in the mdev when it
is not connected - this causes a barrier request to be sent incorrectly
when the first write is done after reconnecting which in turn leads to
the two sides getting out of sync with respect to expected barrier
numbers.

The attached patch addresses this in a couple of ways:

1. Don't call queue_barrier in about_to_complete_local_write if the
connection is not up
2. Ensure the flag is clear at the end of _tl_clear
3. Make sure the flag is cleared if set when connecting

Some of this is belt-and-braces - 1 and 2 should be enough, but just in
case, I thought it was worth adding 3.

Simon
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