-extern struct inode_operations reiserfs_dir_inode_operations;
-extern struct inode_operations reiserfs_symlink_inode_operations;
-extern struct inode_operations reiserfs_special_inode_operations;
+extern const struct inode_operations reiserfs_dir_inode_operations;
+extern const struct inode_operations reiserfs_symlink_inode_operations;
+extern const struct inode_operations reiserfs_special_inode_operations;