143 		if (file->f_op && file->f_op->llseek)  in vfs_llseek()
144 			fn = file->f_op->llseek;  in vfs_llseek()
263 		ret = filp->f_op->aio_read(&kiocb, &iov, 1, kiocb.ki_pos);  in do_sync_read()
283 	if (!file->f_op || (!file->f_op->read && !file->f_op->aio_read))  in vfs_read()
291 		if (file->f_op->read)  in vfs_read()
292 			ret = file->f_op->read(file, buf, count, pos);  in vfs_read()
318 		ret = filp->f_op->aio_write(&kiocb, &iov, 1, kiocb.ki_pos);  in do_sync_write()
338 	if (!file->f_op || (!file->f_op->write && !file->f_op->aio_write))  in vfs_write()
346 		if (file->f_op->write)  in vfs_write()
347 			ret = file->f_op->write(file, buf, count, pos);  in vfs_write()
624 	if (!file->f_op) {  in do_readv_writev()
641 		fn = file->f_op->read;  in do_readv_writev()
642 		fnv = file->f_op->aio_read;  in do_readv_writev()
644 		fn = (io_fn_t)file->f_op->write;  in do_readv_writev()
645 		fnv = file->f_op->aio_write;  in do_readv_writev()
671 	if (!file->f_op || (!file->f_op->aio_read && !file->f_op->read))  in vfs_readv()
684 	if (!file->f_op || (!file->f_op->aio_write && !file->f_op->write))  in vfs_writev()
756 	if (!in_file->f_op || !in_file->f_op->splice_read)  in do_sendfile()
779 	if (!out_file->f_op || !out_file->f_op->sendpage)  in do_sendfile()