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Overlayfs with nfs_export enabled, indexes all directories on copy up. Directory index is requires for decoding lower directory file handles in case ancestors have been renamed. When enabling nfs_export on an overlay that has merge dirs with lower layer redirects, the possibility of ancestor rename requires special handling when encoding lower directory file handles from layer > 1. - Check decode of lower dir with parent under lower redirect - Check decode of lower dir with grandparent under lower redirect - Check decode of lower dir after rename of lower redirected parent - Check decode of lower dir after rename of lower redirected grandparent This test requires and enables overlayfs NFS export support and merge dir rename support (redirect_dir). NFS export support depends on and requires overlayfs index feature. Signed-off-by: Amir Goldstein <amir73il@gmail.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>