257 		if (file->f_op->llseek)  in vfs_llseek()
258 			fn = file->f_op->llseek;  in vfs_llseek()
337 	if (!file->f_op->read_iter)  in vfs_iter_read()
344 	ret = file->f_op->read_iter(&kiocb, iter);  in vfs_iter_read()
357 	if (!file->f_op->write_iter)  in vfs_iter_write()
364 	ret = file->f_op->write_iter(&kiocb, iter);  in vfs_iter_write()
422 	ret = filp->f_op->read_iter(&kiocb, &iter);  in new_sync_read()
431 	if (file->f_op->read)  in __vfs_read()
432 		return file->f_op->read(file, buf, count, pos);  in __vfs_read()
433 	else if (file->f_op->read_iter)  in __vfs_read()
478 	ret = filp->f_op->write_iter(&kiocb, &iter);  in new_sync_write()
488 	if (file->f_op->write)  in __vfs_write()
489 		return file->f_op->write(file, p, count, pos);  in __vfs_write()
490 	else if (file->f_op->write_iter)  in __vfs_write()
799 		fn = file->f_op->read;  in do_readv_writev()
800 		iter_fn = file->f_op->read_iter;  in do_readv_writev()
802 		fn = (io_fn_t)file->f_op->write;  in do_readv_writev()
803 		iter_fn = file->f_op->write_iter;  in do_readv_writev()
973 		fn = file->f_op->read;  in compat_do_readv_writev()
974 		iter_fn = file->f_op->read_iter;  in compat_do_readv_writev()
976 		fn = (io_fn_t)file->f_op->write;  in compat_do_readv_writev()
977 		iter_fn = file->f_op->write_iter;  in compat_do_readv_writev()