bcache: use bio op accessors
Separate the op from the rq_flag_bits and have bcache set/get the bio using bio_set_op_attrs/bio_op. Signed-off-by: NMike Christie <mchristi@redhat.com> Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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