ext4: initialize the write hint in io_submit_init_bio

Make io_submit_init_bio complete by also initializing the write hint.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20260302141922.370070-2-hch@lst.de
Signed-off-by: Eric Biggers <ebiggers@kernel.org>

Author: Christoph Hellwig

fs/ext4/page-io.c

@@ -416,6 +416,7 @@ void ext4_io_submit_init(struct ext4_io_submit *io,
 }
 
 static void io_submit_init_bio(struct ext4_io_submit *io,
+			       struct inode *inode,
 			       struct buffer_head *bh)
 {
 	struct bio *bio;
@@ -429,6 +430,7 @@ static void io_submit_init_bio(struct ext4_io_submit *io,
 	bio->bi_iter.bi_sector = bh->b_blocknr * (bh->b_size >> 9);
 	bio->bi_end_io = ext4_end_bio;
 	bio->bi_private = ext4_get_io_end(io->io_end);
+	bio->bi_write_hint = inode->i_write_hint;
 	io->io_bio = bio;
 	io->io_next_block = bh->b_blocknr;
 	wbc_init_bio(io->io_wbc, bio);
@@ -445,10 +447,8 @@ static void io_submit_add_bh(struct ext4_io_submit *io,
 submit_and_retry:
 		ext4_io_submit(io);
 	}
-	if (io->io_bio == NULL) {
-		io_submit_init_bio(io, bh);
-		io->io_bio->bi_write_hint = inode->i_write_hint;
-	}
+	if (io->io_bio == NULL)
+		io_submit_init_bio(io, inode, bh);
 	if (!bio_add_folio(io->io_bio, io_folio, bh->b_size, bh_offset(bh)))
 		goto submit_and_retry;
 	wbc_account_cgroup_owner(io->io_wbc, folio, bh->b_size);