diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 01d27f3a970e..7b0326661a1e 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -251,6 +251,12 @@ static inline sector_t get_capacity(struct gendisk *disk)
 	return bdev_nr_sectors(disk->part0);
 }
 
+static inline u64 sb_bdev_nr_blocks(struct super_block *sb)
+{
+	return bdev_nr_sectors(sb->s_bdev) >>
+		(sb->s_blocksize_bits - SECTOR_SHIFT);
+}
+
 int bdev_disk_changed(struct gendisk *disk, bool invalidate);
 void blk_drop_partitions(struct gendisk *disk);