-extern struct file_operations efs_dir_operations;
-extern struct address_space_operations efs_symlink_aops;
-
-extern int efs_fill_super(struct super_block *, void *, int);
-extern int efs_statfs(struct super_block *, struct kstatfs *);
+extern const struct file_operations efs_dir_operations;
+extern const struct address_space_operations efs_symlink_aops;