block: remove __blk_rq_map_user_iov
Just duplicate a small amount of code in the low-level map into the bio and copy to the bio routines, leading to much easier to follow and maintain code, and better shared error handling. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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