bio_map_user_iov(): get rid of the iov_for_each()

			     gfp_t gfp_mask)

{

	int j;

	int nr_pages = 0;

	struct bio *bio;

	int ret;

	struct iov_iter i;

	struct iovec iov;

	struct bio_vec *bvec;

	iov_for_each(iov, i, *iter) {

		unsigned long uaddr = (unsigned long) iov.iov_base;

		unsigned long len = iov.iov_len;

		unsigned long end = (uaddr + len + PAGE_SIZE - 1) >> PAGE_SHIFT;

		unsigned long start = uaddr >> PAGE_SHIFT;

		/*

		 * Overflow, abort

		 */

		if (end < start)

			return ERR_PTR(-EINVAL);

		nr_pages += end - start;

	}

	if (!nr_pages)

	if (!iov_iter_count(iter))

		return ERR_PTR(-EINVAL);

	bio = bio_kmalloc(gfp_mask, nr_pages);

	bio = bio_kmalloc(gfp_mask, iov_iter_npages(iter, BIO_MAX_PAGES));

	if (!bio)

		return ERR_PTR(-ENOMEM);