diff --git a/lxd/storage/drivers/errors.go b/lxd/storage/drivers/errors.go
index <HASH>..<HASH> 100644
--- a/lxd/storage/drivers/errors.go
+++ b/lxd/storage/drivers/errors.go
@@ -13,6 +13,9 @@ var ErrUnknownDriver = fmt.Errorf("Unknown driver")
 // ErrNotSupported is the "Not supported" error
 var ErrNotSupported = fmt.Errorf("Not supported")
 
+// ErrCannotBeShrunk is the "Cannot be shrunk" error
+var ErrCannotBeShrunk = fmt.Errorf("Cannot be shrunk")
+
 // ErrDeleteSnapshots is a special error used to tell the backend to delete more recent snapshots
 type ErrDeleteSnapshots struct {
 	Snapshots []string
lxd/storage/drivers/errors: Adds ErrCannotBeShrunk error

Used to indicate to the backend that the volume cannot be shrunk.