linux-kernel - [PATCH] block: drop direction param from bio_integrity_copy

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Message-ID: <20250603183133.1178062-1-csander@purestorage.com>
Date: Tue,  3 Jun 2025 12:31:32 -0600
From: Caleb Sander Mateos <csander@...estorage.com>
To: Jens Axboe <axboe@...nel.dk>
Cc: Caleb Sander Mateos <csander@...estorage.com>,
	linux-block@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] block: drop direction param from bio_integrity_copy_user()

direction is determined from bio, which is already passed in. Compute
op_is_write(bio_op(bio)) directly instead of converting it to an iter
direction and back to a bool.

Signed-off-by: Caleb Sander Mateos <csander@...estorage.com>
---
 block/bio-integrity.c | 17 +++++------------
 1 file changed, 5 insertions(+), 12 deletions(-)

diff --git a/block/bio-integrity.c b/block/bio-integrity.c
index cb94e9be26dc..10912988c8f5 100644
--- a/block/bio-integrity.c
+++ b/block/bio-integrity.c
@@ -152,25 +152,24 @@ int bio_integrity_add_page(struct bio *bio, struct page *page,
 	return len;
 }
 EXPORT_SYMBOL(bio_integrity_add_page);
 
 static int bio_integrity_copy_user(struct bio *bio, struct bio_vec *bvec,
-				   int nr_vecs, unsigned int len,
-				   unsigned int direction)
+				   int nr_vecs, unsigned int len)
 {
-	bool write = direction == ITER_SOURCE;
+	bool write = op_is_write(bio_op(bio));
 	struct bio_integrity_payload *bip;
 	struct iov_iter iter;
 	void *buf;
 	int ret;
 
 	buf = kmalloc(len, GFP_KERNEL);
 	if (!buf)
 		return -ENOMEM;
 
 	if (write) {
-		iov_iter_bvec(&iter, direction, bvec, nr_vecs, len);
+		iov_iter_bvec(&iter, ITER_SOURCE, bvec, nr_vecs, len);
 		if (!copy_from_iter_full(buf, len, &iter)) {
 			ret = -EFAULT;
 			goto free_buf;
 		}
 
@@ -262,24 +261,19 @@ int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
 	struct request_queue *q = bdev_get_queue(bio->bi_bdev);
 	unsigned int align = blk_lim_dma_alignment_and_pad(&q->limits);
 	struct page *stack_pages[UIO_FASTIOV], **pages = stack_pages;
 	struct bio_vec stack_vec[UIO_FASTIOV], *bvec = stack_vec;
 	size_t offset, bytes = iter->count;
-	unsigned int direction, nr_bvecs;
+	unsigned int nr_bvecs;
 	int ret, nr_vecs;
 	bool copy;
 
 	if (bio_integrity(bio))
 		return -EINVAL;
 	if (bytes >> SECTOR_SHIFT > queue_max_hw_sectors(q))
 		return -E2BIG;
 
-	if (bio_data_dir(bio) == READ)
-		direction = ITER_DEST;
-	else
-		direction = ITER_SOURCE;
-
 	nr_vecs = iov_iter_npages(iter, BIO_MAX_VECS + 1);
 	if (nr_vecs > BIO_MAX_VECS)
 		return -E2BIG;
 	if (nr_vecs > UIO_FASTIOV) {
 		bvec = kcalloc(nr_vecs, sizeof(*bvec), GFP_KERNEL);
@@ -298,12 +292,11 @@ int bio_integrity_map_user(struct bio *bio, struct iov_iter *iter)
 		kvfree(pages);
 	if (nr_bvecs > queue_max_integrity_segments(q))
 		copy = true;
 
 	if (copy)
-		ret = bio_integrity_copy_user(bio, bvec, nr_bvecs, bytes,
-					      direction);
+		ret = bio_integrity_copy_user(bio, bvec, nr_bvecs, bytes);
 	else
 		ret = bio_integrity_init_user(bio, bvec, nr_bvecs, bytes);
 	if (ret)
 		goto release_pages;
 	if (bvec != stack_vec)
-- 
2.45.2