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Add an internal struct iovec that we can return as a pointer, with the fields of the iovec overlapping with the ITER_UBUF ubuf and length fields. Then we can have iter_iov() check for the appropriate type, and return &iter->__ubuf_iovec for ITER_UBUF and iter->__iov for ITER_IOVEC and things will magically work out for a single segment request regardless of either type. Signed-off-by: Jens Axboe <axboe@kernel.dk>