lib: Use uint64 for disk stats (ref #3930) (#7019)

lib/config/size.go

@@ -73,25 +73,36 @@ func (s *Size) ParseDefault(str string) error {
 	return err
 }
 
-func CheckFreeSpace(req Size, usage fs.Usage) error {
-	val := req.BaseValue()
+// CheckFreeSpace checks that the free space does not fall below the minimum required free space.
+func CheckFreeSpace(minFree Size, usage fs.Usage) error {
+	val := minFree.BaseValue()
 	if val <= 0 {
 		return nil
 	}
 
-	if req.Percentage() {
+	if minFree.Percentage() {
 		freePct := (float64(usage.Free) / float64(usage.Total)) * 100
 		if freePct < val {
-			return fmt.Errorf("%.1f %% < %v", freePct, req)
+			return fmt.Errorf("%.1f %% < %v", freePct, minFree)
 		}
 	} else if float64(usage.Free) < val {
-		return fmt.Errorf("%sB < %v", formatSI(usage.Free), req)
+		return fmt.Errorf("%sB < %v", formatSI(usage.Free), minFree)
 	}
 
 	return nil
 }
 
-func formatSI(b int64) string {
+// checkAvailableSpace checks that the free space does not fall below the minimum
+// required free space, considering additional required space for a future operation.
+func checkAvailableSpace(req uint64, minFree Size, usage fs.Usage) bool {
+	if usage.Free < req {
+		return false
+	}
+	usage.Free -= req
+	return CheckFreeSpace(minFree, usage) == nil
+}
+
+func formatSI(b uint64) string {
 	switch {
 	case b < 1000:
 		return fmt.Sprintf("%d ", b)