static int md_revalidate(struct gendisk *disk)
{
	struct mddev *mddev = disk->private_data;

	mddev->changed = 0;
	return 0;
}
static int md_revalidate(struct gendisk *disk)
{
	struct mddev *mddev = disk->private_data;

	mddev->changed = 0;
	return 0;
}