block: make sure FSEQ_DATA request has the same rq_disk as the original
rq->rq_disk and bio->bi_bdev->bd_disk may differ if a request has passed through remapping drivers. FSEQ_DATA request incorrectly followed bio->bi_bdev->bd_disk ending up being issued w/ mismatching rq_disk. Make it follow orig_rq->rq_disk. Signed-off-by: NTejun Heo <tj@kernel.org> Reported-by: NKiyoshi Ueda <k-ueda@ct.jp.nec.com> Tested-by: NKiyoshi Ueda <k-ueda@ct.jp.nec.com> Signed-off-by: NJens Axboe <jaxboe@fusionio.com>
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