Re: [REGRESSION] fuse: copy_file_range() fails with EIO

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On Thu, 2024-08-22 at 15:32 +0200, Miklos Szeredi wrote:
> On Thu, 22 Aug 2024 at 15:14, Miklos Szeredi <miklos@xxxxxxxxxx>
> wrote:
> 
> > > > What I don't understand is how this results in the -EIO that Jürg
> > > > reported.
> > > 
> > > I'm not really familiar with this code but it seems `folio_end_read()`
> > > uses xor to update the `PG_uptodate` flag. So if it was already set, it
> > > will incorrectly clear the `PG_uptodate` set, which I guess triggers
> > > the issue.
> 
> Untested patch attached.  Could you please try this?

I can no longer reproduce the issue with this patch. So at least with
regards to my test case, it looks good to me.

Cheers,
Jürg





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