extern struct kmem_cache *ocfs2_dquot_cachep;
extern struct kmem_cache *ocfs2_qf_chunk_cachep;
-extern struct qtree_fmt_operations ocfs2_global_ops;
+extern const struct qtree_fmt_operations ocfs2_global_ops;
struct ocfs2_quota_recovery *ocfs2_begin_quota_recovery(
struct ocfs2_super *osb, int slot_num);