https://www.rfc-editor.org/rfc/rfc7530#section-16.24 covers READDIR. It says "In some cases, the server may encounter an error while obtaining the attributes for a directory entry. Instead of returning an error for the entire READDIR operation, the server can instead return the attribute 'fattr4_rdattr_error'. With this, the server is able to communicate the failure to the client and not fail the entire operation in the instance of what might be a transient failure. Obviously, the client must request the fattr4_rdattr_error attribute for this method to work properly. If the client does not request the attribute, the server has no choice but to return failure for the entire READDIR operation." I'm working in a team building a VFS. We want to support "readdirplus" style of readdir. If the VFS cannot get all attributes, my. FSAL must set the rdattr_error. How should it do that? The fsal_readdir_cb does not seem to have a way to express that. My guess is I must set bit ATTR_RDATTR_ERR on field fsal_attrlist.valid_mask on the attrs argument of fsal_readdir_cb.