diff --git a/drivers/mtd/ubi/cdev.c b/drivers/mtd/ubi/cdev.c
index 03c759b..921dd81 100644
--- a/drivers/mtd/ubi/cdev.c
+++ b/drivers/mtd/ubi/cdev.c
@@ -123,6 +123,7 @@ static int vol_cdev_open(struct inode *inode, struct file *file)
 	if (IS_ERR(desc))
 		return PTR_ERR(desc);
 
+	i_size_write(inode, desc->vol->used_bytes);
 	file->private_data = desc;
 	return 0;
 }