X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/2e2bb873da25e0f7a25a9a9532911bfb5ad69668..ba56503f90d099a215fb7375f5cb1cc1ac667e2c:/sdk/go/arvados/fs_deferred.go

diff --git a/sdk/go/arvados/fs_deferred.go b/sdk/go/arvados/fs_deferred.go
index 1f888a4e8d..bb6c7a2626 100644
--- a/sdk/go/arvados/fs_deferred.go
+++ b/sdk/go/arvados/fs_deferred.go
@@ -87,15 +87,16 @@ func (dn *deferrednode) Child(name string, replace func(inode) (inode, error)) (
 	return dn.realinode().Child(name, replace)
 }
 
-// Sync is currently unimplemented, except when it's a no-op because
-// the real inode hasn't been created.
+// Sync is a no-op if the real inode hasn't even been created yet.
 func (dn *deferrednode) Sync() error {
 	dn.mtx.Lock()
 	defer dn.mtx.Unlock()
-	if dn.created {
-		return ErrInvalidArgument
-	} else {
+	if !dn.created {
 		return nil
+	} else if syncer, ok := dn.wrapped.(syncer); ok {
+		return syncer.Sync()
+	} else {
+		return ErrInvalidOperation
 	}
 }
 
@@ -111,3 +112,4 @@ func (dn *deferrednode) RLock()                          { dn.realinode().RLock(
 func (dn *deferrednode) RUnlock()                        { dn.realinode().RUnlock() }
 func (dn *deferrednode) FS() FileSystem                  { return dn.currentinode().FS() }
 func (dn *deferrednode) Parent() inode                   { return dn.currentinode().Parent() }
+func (dn *deferrednode) MemorySize() int64               { return dn.currentinode().MemorySize() }