block cfq: don't use atomic_t for cfq_group
cfq_group->ref is used with queue_lock hold, the only exception is cfq_set_request, which looks like a bug to me, so ref doesn't need to be an atomic and atomic operation is slower. Signed-off-by: NShaohua Li <shaohua.li@intel.com> Reviewed-by: NJeff Moyer <jmoyer@redhat.com> Acked-by: NVivek Goyal <vgoyal@redhat.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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