On Wed, Mar 28, 2018 at 09:26:38AM +0200, Christoph Hellwig wrote:

+static int aio_fsync(struct fsync_iocb *req, struct iocb *iocb, bool datasync)
+{
+	int ret;
+
+	if (iocb->aio_buf)
+		return -EINVAL;
+	if (iocb->aio_offset || iocb->aio_nbytes || iocb->aio_rw_flags)
+		return -EINVAL;
+
+	req->file = fget(iocb->aio_fildes);
+	if (unlikely(!req->file))
+		return -EBADF;
+
+	ret = -EINVAL;
+	if (!req->file->f_op->fsync)
+		goto out_fput;
+
+	req->datasync = datasync;
+	INIT_WORK(&req->work, aio_fsync_work);
+	schedule_work(&req->work);
+	return -EIOCBQUEUED;
+out_fput:
+	if (unlikely(ret && ret != -EIOCBQUEUED))

Really?  The only way to get there is if we got NULL ->f_op->fsync.
So this "if (unlikely(...))" is actually if (true) and I'm not
sure we want that separated anyway - simply

	if (unlikely(!req->file->f_op->fsync)) {
		fput(req->file);
		return -EINVAL;
	}

+		fput(req->file);

+	return ret;
+}

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