xd: dequeue in-flight request
xd processes requests one-by-one synchronously and can be easily converted to dequeueing model. Convert it. While at it, use rq_cur_bytes instead of rq_bytes when checking for sector overflow. This is for for consistency and better behavior for merged requests. [ Impact: dequeue in-flight request ] Signed-off-by: NTejun Heo <tj@kernel.org> Signed-off-by: NJens Axboe <jens.axboe@oracle.com>
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