297 		if (file->f_op->llseek)  in vfs_llseek()
298 			fn = file->f_op->llseek;  in vfs_llseek()
448 	if (unlikely(!file->f_op->read_iter || file->f_op->read))  in __kernel_read()
454 	ret = file->f_op->read_iter(&kiocb, &iter);  in __kernel_read()
493 	if (file->f_op->read)  in vfs_read()
494 		ret = file->f_op->read(file, buf, count, pos);  in vfs_read()
495 	else if (file->f_op->read_iter)  in vfs_read()
544 	if (unlikely(!file->f_op->write_iter || file->f_op->write))  in __kernel_write()
550 	ret = file->f_op->write_iter(&kiocb, &iter);  in __kernel_write()
602 	if (file->f_op->write)  in vfs_write()
603 		ret = file->f_op->write(file, buf, count, pos);  in vfs_write()
604 	else if (file->f_op->write_iter)  in vfs_write()
761 			nr = filp->f_op->read(filp, iovec.iov_base,  in do_loop_readv_writev()
764 			nr = filp->f_op->write(filp, iovec.iov_base,  in do_loop_readv_writev()
800 	if (file->f_op->read_iter)  in do_iter_read()
816 	if (!file->f_op->read_iter)  in vfs_iocb_iter_read()
841 	if (!file->f_op->read_iter)  in vfs_iter_read()
865 	if (file->f_op->write_iter)  in do_iter_write()
880 	if (!file->f_op->write_iter)  in vfs_iocb_iter_write()
905 	if (!file->f_op->write_iter)  in vfs_iter_write()
1424 	} else if (file_out->f_op->copy_file_range) {  in generic_copy_file_checks()
1425 		if (file_in->f_op->copy_file_range !=  in generic_copy_file_checks()
1426 		    file_out->f_op->copy_file_range)  in generic_copy_file_checks()
1502 	if (!splice && file_out->f_op->copy_file_range) {  in vfs_copy_file_range()
1503 		ret = file_out->f_op->copy_file_range(file_in, pos_in,  in vfs_copy_file_range()
1509 	if (!splice && file_in->f_op->remap_file_range &&  in vfs_copy_file_range()
1511 		ret = file_in->f_op->remap_file_range(file_in, pos_in,  in vfs_copy_file_range()