if contextCanceled(ctx) {
		xioutil.SafeClose(updates)
		return dataUsageCache{}, ctx.Err()
	}

	if err := p.checkDiskStale(); err != nil {
		xioutil.SafeClose(updates)
		return dataUsageCache{}, err
	}

	weSleep := func() bool {
		return scannerIdleMode.Load() == 0
	}