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'struct ublk_map_data' is passed to ublk_copy_user_pages() for copying data between userspace buffer and request pages. Here what matters is userspace buffer address/len and 'struct request', so replace ->io field with user buffer address, and rename max_bytes as len. Meantime remove 'ubq' field from ublk_map_data, since it isn't used any more. Then code becomes more readable. Reviewed-by: Ziyang Zhang <ZiyangZhang@linux.alibaba.com> Signed-off-by: Ming Lei <ming.lei@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>