289 	return file->f_op->llseek(file, offset, whence);  in vfs_llseek()
422 	if (unlikely(!file->f_op->read_iter || file->f_op->read))  in __kernel_read()
428 	ret = file->f_op->read_iter(&kiocb, &iter);  in __kernel_read()
467 	if (file->f_op->read)  in vfs_read()
468 		ret = file->f_op->read(file, buf, count, pos);  in vfs_read()
469 	else if (file->f_op->read_iter)  in vfs_read()
512 	if (unlikely(!file->f_op->write_iter || file->f_op->write))  in __kernel_write_iter()
517 	ret = file->f_op->write_iter(&kiocb, from);  in __kernel_write_iter()
581 	if (file->f_op->write)  in vfs_write()
582 		ret = file->f_op->write(file, buf, count, pos);  in vfs_write()
583 	else if (file->f_op->write_iter)  in vfs_write()
756 			nr = filp->f_op->read(filp, iovec.iov_base,  in do_loop_readv_writev()
759 			nr = filp->f_op->write(filp, iovec.iov_base,  in do_loop_readv_writev()
795 	if (file->f_op->read_iter)  in do_iter_read()
811 	if (!file->f_op->read_iter)  in vfs_iocb_iter_read()
836 	if (!file->f_op->read_iter)  in vfs_iter_read()
860 	if (file->f_op->write_iter)  in do_iter_write()
875 	if (!file->f_op->write_iter)  in vfs_iocb_iter_write()
900 	if (!file->f_op->write_iter)  in vfs_iter_write()
1431 	} else if (file_out->f_op->copy_file_range) {  in generic_copy_file_checks()
1432 		if (file_in->f_op->copy_file_range !=  in generic_copy_file_checks()
1433 		    file_out->f_op->copy_file_range)  in generic_copy_file_checks()
1509 	if (!splice && file_out->f_op->copy_file_range) {  in vfs_copy_file_range()
1510 		ret = file_out->f_op->copy_file_range(file_in, pos_in,  in vfs_copy_file_range()
1516 	if (!splice && file_in->f_op->remap_file_range &&  in vfs_copy_file_range()
1518 		ret = file_in->f_op->remap_file_range(file_in, pos_in,  in vfs_copy_file_range()