Fix the issue where compiling containers-storage with exclude_disk_qu…

drivers/overlay/overlay_cgo.go → drivers/overlay/overlay_disk_quota.go

@@ -1,5 +1,5 @@
-//go:build linux && cgo
-// +build linux,cgo
+//go:build linux && cgo && !exclude_disk_quota
+// +build linux,cgo,!exclude_disk_quota
 
 package overlay
 

drivers/overlay/overlay_disk_quota_unsupported.go

@@ -0,0 +1,18 @@
+//go:build linux && (!cgo || exclude_disk_quota)
+// +build linux
+// +build !cgo exclude_disk_quota
+
+package overlay
+
+import (
+	"path"
+
+	"github.com/containers/storage/pkg/directory"
+)
+
+// ReadWriteDiskUsage returns the disk usage of the writable directory for the ID.
+// For Overlay, it attempts to check the XFS quota for size, and falls back to
+// finding the size of the "diff" directory.
+func (d *Driver) ReadWriteDiskUsage(id string) (*directory.DiskUsage, error) {
+	return directory.Usage(path.Join(d.dir(id), "diff"))
+}

drivers/overlay/overlay_nocgo.go

@@ -5,18 +5,8 @@ package overlay
 
 import (
 	"fmt"
-	"path"
-
-	"github.com/containers/storage/pkg/directory"
 )
 
-// ReadWriteDiskUsage returns the disk usage of the writable directory for the ID.
-// For Overlay, it attempts to check the XFS quota for size, and falls back to
-// finding the size of the "diff" directory.
-func (d *Driver) ReadWriteDiskUsage(id string) (*directory.DiskUsage, error) {
-	return directory.Usage(path.Join(d.dir(id), "diff"))
-}
-
 func getComposeFsHelper() (string, error) {
 	return "", fmt.Errorf("composefs not supported on this build")
 }