btrfs: use bio fields for op and flags
The bio REQ_OP and bi_rw rq_flag_bits are now always setup, so there is no need to pass around the rq_flag_bits bits too. btrfs users should should access the bio insead. Signed-off-by: NMike Christie <mchristi@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NHannes Reinecke <hare@suse.com> Signed-off-by: NJens Axboe <axboe@fb.com>
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