[PATCH v2 00/16] expand mmap_prepare functionality, port more users

[Lorenzo Stoakes]

On Wed, Sep 10, 2025 at 02:38:45PM -0700, Andrew Morton wrote:
> On Wed, 10 Sep 2025 21:21:55 +0100 Lorenzo Stoakes <lorenzo.stoakes at oracle.com> wrote:
>
> > Since commit c84bf6dd2b83 ("mm: introduce new .mmap_prepare() file
> > callback"), The f_op->mmap hook has been deprecated in favour of
> > f_op->mmap_prepare.
> >
> > This was introduced in order to make it possible for us to eventually
> > eliminate the f_op->mmap hook which is highly problematic as it allows
> > drivers and filesystems raw access to a VMA which is not yet correctly
> > initialised.
> >
> > This hook also introduced complexity for the memory mapping operation, as
> > we must correctly unwind what we do should an error arises.
> >
> > Overall this interface being so open has caused significant problems for
> > us, including security issues, it is important for us to simply eliminate
> > this as a source of problems.
> >
> > Therefore this series continues what was established by extending the
> > functionality further to permit more drivers and filesystems to use
> > mmap_prepare.
>
> Cool, I'll add this to mm-new but I'll suppress the usual emails.

Thanks!