struct statfs;
extern struct inode_operations efs_dir_inode_operations;
-extern struct file_operations efs_dir_operations;
-extern struct address_space_operations efs_symlink_aops;
+extern const struct file_operations efs_dir_operations;
+extern const struct address_space_operations efs_symlink_aops;
extern void efs_read_inode(struct inode *);
extern efs_block_t efs_map_block(struct inode *, efs_block_t);