md: stop using ->queuedata

Pointer to mddev is already available in private_data.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Song Liu <songliubraving@fb.com>

drivers/md/md.c

@@ -467,7 +467,7 @@ static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio)
 {
 	const int rw = bio_data_dir(bio);
 	const int sgrp = op_stat_group(bio_op(bio));
-	struct mddev *mddev = q->queuedata;
+	struct mddev *mddev = bio->bi_disk->private_data;
 	unsigned int sectors;
 
 	if (unlikely(test_bit(MD_BROKEN, &mddev->flags)) && (rw == WRITE)) {
@@ -5644,7 +5644,6 @@ static int md_alloc(dev_t dev, char *name)
 	mddev->queue = blk_alloc_queue(md_make_request, NUMA_NO_NODE);
 	if (!mddev->queue)
 		goto abort;
-	mddev->queue->queuedata = mddev;
 
 	blk_set_stacking_limits(&mddev->queue->limits);