On 2020/1/16 23:32, Jan Kara wrote:
Thanks for the report and the patch. But the data integrity when mixing buffered and direct IO like this is best effort only. We definitely do not want to sacrifice performance of common cases or code complexity to make cases like this work reliably.
In the patch, the only thing that is diffrent is that iomap_begin() will be called for each page. However, it seems the performance in sequential read didn't get worse. Is there a specific case that the performance will get worse? Thanks! Yu Kuai!
