297 		if (file->f_op->llseek)  in vfs_llseek()
298 			fn = file->f_op->llseek;  in vfs_llseek()
437 	if (unlikely(!file->f_op->read_iter || file->f_op->read))  in __kernel_read()
443 	ret = file->f_op->read_iter(&kiocb, &iter);  in __kernel_read()
482 	if (file->f_op->read)  in vfs_read()
483 		ret = file->f_op->read(file, buf, count, pos);  in vfs_read()
484 	else if (file->f_op->read_iter)  in vfs_read()
533 	if (unlikely(!file->f_op->write_iter || file->f_op->write))  in __kernel_write()
539 	ret = file->f_op->write_iter(&kiocb, &iter);  in __kernel_write()
591 	if (file->f_op->write)  in vfs_write()
592 		ret = file->f_op->write(file, buf, count, pos);  in vfs_write()
593 	else if (file->f_op->write_iter)  in vfs_write()
750 			nr = filp->f_op->read(filp, iovec.iov_base,  in do_loop_readv_writev()
753 			nr = filp->f_op->write(filp, iovec.iov_base,  in do_loop_readv_writev()
789 	if (file->f_op->read_iter)  in do_iter_read()
805 	if (!file->f_op->read_iter)  in vfs_iocb_iter_read()
830 	if (!file->f_op->read_iter)  in vfs_iter_read()
854 	if (file->f_op->write_iter)  in do_iter_write()
869 	if (!file->f_op->write_iter)  in vfs_iocb_iter_write()
894 	if (!file->f_op->write_iter)  in vfs_iter_write()
1399 	if (file_out->f_op->copy_file_range &&  in do_copy_file_range()
1400 	    file_out->f_op->copy_file_range == file_in->f_op->copy_file_range)  in do_copy_file_range()
1401 		return file_out->f_op->copy_file_range(file_in, pos_in,  in do_copy_file_range()
1498 	if (file_in->f_op->remap_file_range &&  in vfs_copy_file_range()
1502 		cloned = file_in->f_op->remap_file_range(file_in, pos_in,  in vfs_copy_file_range()