Macro fs_node_impl_xattr_delegate 

macro_rules! fs_node_impl_xattr_delegate {
    ($self:ident, $delegate:expr) => { ... };
}

Implements extended attribute ops for FsNodeOps by delegating to another object which implements the XattrStorage trait or a similar interface. For example:

struct Xattrs {}

impl XattrStorage for Xattrs {
    // implement XattrStorage
}

struct Node {
    xattrs: Xattrs
}

impl FsNodeOps for Node {
    // Delegate extended attribute ops in FsNodeOps to self.xattrs
    fs_node_impl_xattr_delegate!(self, self.xattrs);

    // add other FsNodeOps impls here
}