extern const struct inode_operations ecryptfs_dir_iops;
extern const struct inode_operations ecryptfs_symlink_iops;
extern const struct super_operations ecryptfs_sops;
-extern struct dentry_operations ecryptfs_dops;
+extern const struct dentry_operations ecryptfs_dops;
extern struct address_space_operations ecryptfs_aops;
extern int ecryptfs_verbosity;
extern unsigned int ecryptfs_message_buf_len;