block: remove bio_iov_iter_get_pages

Switch the only caller to bio_iov_iter_get_pages, and explain why it does
not have any alignment requirements.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

block/blk-map.c

@@ -283,7 +283,11 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter,
 	bio = blk_rq_map_bio_alloc(rq, nr_vecs, gfp_mask);
 	if (!bio)
 		return -ENOMEM;
-	ret = bio_iov_iter_get_pages(bio, iter);
+	/*
+	 * No alignment requirements on our part to support arbitrary
+	 * passthrough commands.
+	 */
+	ret = bio_iov_iter_get_pages_aligned(bio, iter, 0);
 	if (ret)
 		goto out_put;
 	ret = blk_rq_append_bio(rq, bio);

include/linux/bio.h

@@ -449,11 +449,6 @@ int bdev_rw_virt(struct block_device *bdev, sector_t sector, void *data,
 int bio_iov_iter_get_pages_aligned(struct bio *bio, struct iov_iter *iter,
 		unsigned len_align_mask);
 
-static inline int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter)
-{
-	return bio_iov_iter_get_pages_aligned(bio, iter, 0);
-}
-
 void bio_iov_bvec_set(struct bio *bio, const struct iov_iter *iter);
 void __bio_release_pages(struct bio *bio, bool mark_dirty);
 extern void bio_set_pages_dirty(struct bio *bio);