e03ad4ee Fri Mar 24 15:35:49 CDT 2023 Jens Axboe <axboe@kernel.dk> iov_iter: convert import_single_range() to ITER_UBUF
Since we're just importing a single vector, we don't have to turn it into an ITER_IOVEC. Instead turn it into an ITER_UBUF, which is cheaper to iterate.