Christoph Hellwig ecb0a83e31 ubd: remove use of blk_rq_map_sg
There is no good reason to create a scatterlist in the ubd driver,
it can just iterate the request directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
[rw: Folded in improvements as discussed with hch and jens]
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2018-10-18 15:13:12 -06:00
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