pktcdvd: Convert to bdev_open_by_dev()

Convert pktcdvd to use bdev_open_by_dev().

Acked-by: Christoph Hellwig <[e-mail]>
Acked-by: Christian Brauner <[e-mail]>
Signed-off-by: Jan Kara <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Christian Brauner <[e-mail]>

drivers/block/pktcdvd.c

···
 		n += sysfs_emit_at(data, n, "%s %u:%u %u:%u\n",
 			pd->disk->disk_name,
 			MAJOR(pd->pkt_dev), MINOR(pd->pkt_dev),
-			MAJOR(pd->bdev->bd_dev),
-			MINOR(pd->bdev->bd_dev));
+			MAJOR(pd->bdev_handle->bdev->bd_dev),
+			MINOR(pd->bdev_handle->bdev->bd_dev));
 	}
 	mutex_unlock(&ctl_mutex);
 	return n;
···
 	char *msg;
 	int states[PACKET_NUM_STATES];
 
-	seq_printf(m, "Writer %s mapped to %pg:\n", pd->disk->disk_name, pd->bdev);
+	seq_printf(m, "Writer %s mapped to %pg:\n", pd->disk->disk_name,
+		   pd->bdev_handle->bdev);
 
 	seq_printf(m, "\nSettings:\n");
 	seq_printf(m, "\tpacket size:\t\t%dkB\n", pd->settings.size / 2);
···
  */
 static int pkt_generic_packet(struct pktcdvd_device *pd, struct packet_command *cgc)
 {
-	struct request_queue *q = bdev_get_queue(pd->bdev);
+	struct request_queue *q = bdev_get_queue(pd->bdev_handle->bdev);
 	struct scsi_cmnd *scmd;
 	struct request *rq;
 	int ret = 0;
···
 			continue;
 
 		bio = pkt->r_bios[f];
-		bio_init(bio, pd->bdev, bio->bi_inline_vecs, 1, REQ_OP_READ);
+		bio_init(bio, pd->bdev_handle->bdev, bio->bi_inline_vecs, 1,
+			 REQ_OP_READ);
 		bio->bi_iter.bi_sector = pkt->sector + f * (CD_FRAMESIZE >> 9);
 		bio->bi_end_io = pkt_end_io_read;
 		bio->bi_private = pkt;
···
 	struct device *ddev = disk_to_dev(pd->disk);
 	int f;
 
-	bio_init(pkt->w_bio, pd->bdev, pkt->w_bio->bi_inline_vecs, pkt->frames,
-		 REQ_OP_WRITE);
+	bio_init(pkt->w_bio, pd->bdev_handle->bdev, pkt->w_bio->bi_inline_vecs,
+		 pkt->frames, REQ_OP_WRITE);
 	pkt->w_bio->bi_iter.bi_sector = pkt->sector;
 	pkt->w_bio->bi_end_io = pkt_end_io_packet_write;
 	pkt->w_bio->bi_private = pkt;
···
 	int ret;
 	long lba;
 	struct request_queue *q;
-	struct block_device *bdev;
+	struct bdev_handle *bdev_handle;
 
 	/*
 	 * We need to re-open the cdrom device without O_NONBLOCK to be able
 	 * to read/write from/to it. It is already opened in O_NONBLOCK mode
 	 * so open should not fail.
 	 */
-	bdev = blkdev_get_by_dev(pd->bdev->bd_dev, BLK_OPEN_READ, pd, NULL);
-	if (IS_ERR(bdev)) {
-		ret = PTR_ERR(bdev);
+	bdev_handle = bdev_open_by_dev(pd->bdev_handle->bdev->bd_dev,
+				       BLK_OPEN_READ, pd, NULL);
+	if (IS_ERR(bdev_handle)) {
+		ret = PTR_ERR(bdev_handle);
 		goto out;
 	}
+	pd->open_bdev_handle = bdev_handle;
 
 	ret = pkt_get_last_written(pd, &lba);
 	if (ret) {
···
 	}
 
 	set_capacity(pd->disk, lba << 2);
-	set_capacity_and_notify(pd->bdev->bd_disk, lba << 2);
+	set_capacity_and_notify(pd->bdev_handle->bdev->bd_disk, lba << 2);
 
-	q = bdev_get_queue(pd->bdev);
+	q = bdev_get_queue(pd->bdev_handle->bdev);
 	if (write) {
 		ret = pkt_open_write(pd);
 		if (ret)
···
 	return 0;
 
 out_putdev:
-	blkdev_put(bdev, pd);
+	bdev_release(bdev_handle);
 out:
 	return ret;
 }
···
 	pkt_lock_door(pd, 0);
 
 	pkt_set_speed(pd, MAX_SPEED, MAX_SPEED);
-	blkdev_put(pd->bdev, pd);
+	bdev_release(pd->open_bdev_handle);
+	pd->open_bdev_handle = NULL;
 
 	pkt_shrink_pktlist(pd);
 }
···
 
 static void pkt_make_request_read(struct pktcdvd_device *pd, struct bio *bio)
 {
-	struct bio *cloned_bio =
-		bio_alloc_clone(pd->bdev, bio, GFP_NOIO, &pkt_bio_set);
+	struct bio *cloned_bio = bio_alloc_clone(pd->bdev_handle->bdev, bio,
+		GFP_NOIO, &pkt_bio_set);
 	struct packet_stacked_data *psd = mempool_alloc(&psd_pool, GFP_NOIO);
 
 	psd->pd = pd;
···
 {
 	struct device *ddev = disk_to_dev(pd->disk);
 	int i;
-	struct block_device *bdev;
+	struct bdev_handle *bdev_handle;
 	struct scsi_device *sdev;
 
 	if (pd->pkt_dev == dev) {
···
 		struct pktcdvd_device *pd2 = pkt_devs[i];
 		if (!pd2)
 			continue;
-		if (pd2->bdev->bd_dev == dev) {
-			dev_err(ddev, "%pg already setup\n", pd2->bdev);
+		if (pd2->bdev_handle->bdev->bd_dev == dev) {
+			dev_err(ddev, "%pg already setup\n",
+				pd2->bdev_handle->bdev);
 			return -EBUSY;
 		}
 		if (pd2->pkt_dev == dev) {
···
 		}
 	}
 
-	bdev = blkdev_get_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_NDELAY, NULL,
-				 NULL);
-	if (IS_ERR(bdev))
-		return PTR_ERR(bdev);
-	sdev = scsi_device_from_queue(bdev->bd_disk->queue);
+	bdev_handle = bdev_open_by_dev(dev, BLK_OPEN_READ | BLK_OPEN_NDELAY,
+				       NULL, NULL);
+	if (IS_ERR(bdev_handle))
+		return PTR_ERR(bdev_handle);
+	sdev = scsi_device_from_queue(bdev_handle->bdev->bd_disk->queue);
 	if (!sdev) {
-		blkdev_put(bdev, NULL);
+		bdev_release(bdev_handle);
 		return -EINVAL;
 	}
 	put_device(&sdev->sdev_gendev);
···
 	/* This is safe, since we have a reference from open(). */
 	__module_get(THIS_MODULE);
 
-	pd->bdev = bdev;
-	set_blocksize(bdev, CD_FRAMESIZE);
+	pd->bdev_handle = bdev_handle;
+	set_blocksize(bdev_handle->bdev, CD_FRAMESIZE);
 
 	pkt_init_queue(pd);
 
···
 	}
 
 	proc_create_single_data(pd->disk->disk_name, 0, pkt_proc, pkt_seq_show, pd);
-	dev_notice(ddev, "writer mapped to %pg\n", bdev);
+	dev_notice(ddev, "writer mapped to %pg\n", bdev_handle->bdev);
 	return 0;
 
 out_mem:
-	blkdev_put(bdev, NULL);
+	bdev_release(bdev_handle);
 	/* This is safe: open() is still holding a reference. */
 	module_put(THIS_MODULE);
 	return -ENOMEM;
···
 
 	if (!pd)
 		return 0;
-	if (!pd->bdev)
+	if (!pd->bdev_handle)
 		return 0;
-	attached_disk = pd->bdev->bd_disk;
+	attached_disk = pd->bdev_handle->bdev->bd_disk;
 	if (!attached_disk || !attached_disk->fops->check_events)
 		return 0;
 	return attached_disk->fops->check_events(attached_disk, clearing);
···
 		goto out_mem2;
 
 	/* inherit events of the host device */
-	disk->events = pd->bdev->bd_disk->events;
+	disk->events = pd->bdev_handle->bdev->bd_disk->events;
 
 	ret = add_disk(disk);
 	if (ret)
···
 	pkt_debugfs_dev_remove(pd);
 	pkt_sysfs_dev_remove(pd);
 
-	blkdev_put(pd->bdev, NULL);
+	bdev_release(pd->bdev_handle);
 
 	remove_proc_entry(pd->disk->disk_name, pkt_proc);
 	dev_notice(ddev, "writer unmapped\n");
···
 
 	pd = pkt_find_dev_from_minor(ctrl_cmd->dev_index);
 	if (pd) {
-		ctrl_cmd->dev = new_encode_dev(pd->bdev->bd_dev);
+		ctrl_cmd->dev = new_encode_dev(pd->bdev_handle->bdev->bd_dev);
 		ctrl_cmd->pkt_dev = new_encode_dev(pd->pkt_dev);
 	} else {
 		ctrl_cmd->dev = 0;

include/linux/pktcdvd.h

···
 
 struct pktcdvd_device
 {
-	struct block_device	*bdev;		/* dev attached */
+	struct bdev_handle	*bdev_handle;	/* dev attached */
+	/* handle acquired for bdev during pkt_open_dev() */
+	struct bdev_handle	*open_bdev_handle;
 	dev_t			pkt_dev;	/* our dev */
 	struct packet_settings	settings;
 	struct packet_stats	stats;