Re: [PATCH] mm/filemap: do not allocate cache pages beyond end of file at read

[Linus Torvalds]

On Mon, Oct 28, 2019 at 1:42 PM Kirill A. Shutemov <kirill@xxxxxxxxxxxxx> wrote:
>
> I've tried something of this sort back in 2013:
>
> http://lore.kernel.org/r/1377099441-2224-1-git-send-email-kirill.shutemov@xxxxxxxxxxxxxxx
>
> and I've got push back.
>
> Apparently, some filesystems may not have valid i_size before >readpage().
> Not sure if it's still the case...

Well, I agree that there might be some network filesystem that might
have inode sizes that are stale, but if that's the case then I don't
think your previous patch works either.

It too will avoid the readpage() if the read position is beyond i_size.

No?

               Linus