+ssize_t aufs_getxattr(struct dentry *dentry, struct inode *inode,
+ const char *name, void *value, size_t size);
+int aufs_setxattr(struct dentry *dentry, struct inode *inode, const char *name,
+ const void *value, size_t size, int flags);
+int aufs_removexattr(struct dentry *dentry, const char *name);
+
+/* void au_xattr_init(struct super_block *sb); */