1 files changed, 16 insertions, 19 deletions

diff --git a/block/genhd.c b/block/genhd.c
index 0f9769db2de8..08f76135a637 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -356,7 +356,7 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
 }
 EXPORT_SYMBOL_GPL(disk_uevent);
 
-int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
+int disk_scan_partitions(struct gendisk *disk, fmode_t mode, void *owner)
 {
 	struct block_device *bdev;
 
@@ -366,6 +366,9 @@ int disk_scan_partitions(struct gendisk *disk, fmode_t mode)
 		return -EINVAL;
 	if (disk->open_partitions)
 		return -EBUSY;
+	/* Someone else has bdev exclusively open? */
+	if (disk->part0->bd_holder && disk->part0->bd_holder != owner)
+		return -EBUSY;
 
 	set_bit(GD_NEED_PART_SCAN, &disk->state);
 	bdev = blkdev_get_by_dev(disk_devt(disk), mode, NULL);
@@ -479,10 +482,6 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 		goto out_put_holder_dir;
 	}
 
-	ret = bd_register_pending_holders(disk);
-	if (ret < 0)
-		goto out_put_slave_dir;
-
 	ret = blk_register_queue(disk);
 	if (ret)
 		goto out_put_slave_dir;
@@ -500,7 +499,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
 
 		bdev_add(disk->part0, ddev->devt);
 		if (get_capacity(disk))
-			disk_scan_partitions(disk, FMODE_READ);
+			disk_scan_partitions(disk, FMODE_READ, NULL);
 
 		/*
 		 * Announce the disk and partitions after all partitions are
@@ -530,6 +529,7 @@ out_unregister_queue:
 	rq_qos_exit(disk->queue);
 out_put_slave_dir:
 	kobject_put(disk->slave_dir);
+	disk->slave_dir = NULL;
 out_put_holder_dir:
 	kobject_put(disk->part0->bd_holder_dir);
 out_del_integrity:
@@ -560,6 +560,11 @@ void blk_mark_disk_dead(struct gendisk *disk)
 {
 	set_bit(GD_DEAD, &disk->state);
 	blk_queue_start_drain(disk->queue);
+
+	/*
+	 * Stop buffered writers from dirtying pages that can't be written out.
+	 */
+	set_capacity_and_notify(disk, 0);
 }
 EXPORT_SYMBOL_GPL(blk_mark_disk_dead);
 
@@ -629,6 +634,7 @@ void del_gendisk(struct gendisk *disk)
 
 	kobject_put(disk->part0->bd_holder_dir);
 	kobject_put(disk->slave_dir);
+	disk->slave_dir = NULL;
 
 	part_stat_set_all(disk->part0, 0);
 	disk->part0->bd_stamp = 0;
@@ -643,7 +649,9 @@ void del_gendisk(struct gendisk *disk)
 
 	blk_sync_queue(q);
 	blk_flush_integrity();
-	blk_mq_cancel_work_sync(q);
+
+	if (queue_is_mq(q))
+		blk_mq_cancel_work_sync(q);
 
 	blk_mq_quiesce_queue(q);
 	if (q->elevator) {
@@ -1193,21 +1201,10 @@ struct class block_class = {
 	.dev_uevent	= block_uevent,
 };
 
-static char *block_devnode(struct device *dev, umode_t *mode,
-			   kuid_t *uid, kgid_t *gid)
-{
-	struct gendisk *disk = dev_to_disk(dev);
-
-	if (disk->fops->devnode)
-		return disk->fops->devnode(disk, mode);
-	return NULL;
-}
-
 const struct device_type disk_type = {
 	.name		= "disk",
 	.groups		= disk_attr_groups,
 	.release	= disk_release,
-	.devnode	= block_devnode,
 };
 
 #ifdef CONFIG_PROC_FS
@@ -1412,7 +1409,7 @@ struct gendisk *__blk_alloc_disk(int node, struct lock_class_key *lkclass)
 	struct request_queue *q;
 	struct gendisk *disk;
 
-	q = blk_alloc_queue(node, false);
+	q = blk_alloc_queue(node);
 	if (!q)
 		return NULL;