Re: [RFC] iomap: fix race between readahead and direct write

[yukuai (C)]

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!