drbd: base completion and destruction of requests on ref counts
cherry-picked and adapted from drbd 9 devel branch The logic for when to get or put a reference is in mod_rq_state(). To not get confused in the freeze/thaw respectively resend/restart paths, or when cleaning up requests waiting for P_BARRIER_ACK, this also introduces additional state flags: RQ_COMPLETION_SUSP, and RQ_EXP_BARR_ACK. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
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