#ifdef CONFIG_SYSFS
+int bd_disk_holder_corrupted_range(struct block_device *bdev, loff_t off,
+ size_t len, void *data);
int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk);
void bd_unlink_disk_holder(struct block_device *bdev, struct gendisk *disk);
#else
+int bd_disk_holder_corrupted_range(struct block_device *bdev, loff_t off,
+ size_t len, void *data)
+{
+ return 0;
+}
static inline int bd_link_disk_holder(struct block_device *bdev,
struct gendisk *disk)