address_space_operations  382 include/linux/fs.h extern const struct address_space_operations empty_aops;
address_space_operations  409 include/linux/fs.h 	const struct address_space_operations *a_ops;	/* methods */
address_space_operations  426 include/linux/nfs_fs.h extern const struct address_space_operations nfs_file_aops;
address_space_operations  427 include/linux/nfs_fs.h extern const struct address_space_operations nfs_dir_aops;