[PATCH v3 56/68] afs: Handle len being extending over page end in write_begin/write_end

[Linus Torvalds]

On Thu, Dec 16, 2021 at 8:22 AM David Howells <dhowells at redhat.com> wrote:
>
> With transparent huge pages, in the future, write_begin() and write_end()
> may be passed a length parameter that, in combination with the offset into
> the page, exceeds the length of that page.  This allows
> grab_cache_page_write_begin() to better choose the size of THP to allocate.

I still think this is a fundamental bug in the caller. That
"explanation" is weak, and the whole concept smells like week-old fish
to me.

         Linus