block/fs/drivers: remove rw argument from submit_bio

This has callers of submit_bio/submit_bio_wait set the bio->bi_rw
instead of passing it in. This makes that use the same as
generic_make_request and how we set the other bio fields.

Signed-off-by: Mike Christie <mchristi@redhat.com>

Fixed up fs/ext4/crypto.c

Signed-off-by: Jens Axboe <axboe@fb.com>
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 2a01df9..a72dbcc 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -342,7 +342,8 @@
 	if (bio) {
 		int io_op = io->io_wbc->sync_mode == WB_SYNC_ALL ?
 			    WRITE_SYNC : WRITE;
-		submit_bio(io_op, io->io_bio);
+		io->io_bio->bi_rw = io_op;
+		submit_bio(io->io_bio);
 	}
 	io->io_bio = NULL;
 }