sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len)
{
	long n;

	if (kstrtol(buf, 10, &n))
		return -EINVAL;

	if (n != 0 && n != 1)
		return -EINVAL;

	mddev->parallel_resync = n;

	if (mddev->sync_thread)
		wake_up(&resync_wait);

	return len;
}

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