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Message-ID: <b91c387e-5226-4c5e-94c3-04e80409ed62@lucifer.local>
Date: Tue, 17 Jun 2025 06:25:34 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Christoph Hellwig <hch@...radead.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
"Liam R . Howlett" <Liam.Howlett@...cle.com>,
Jens Axboe <axboe@...nel.dk>,
Jani Nikula <jani.nikula@...ux.intel.com>,
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Subject: Re: [PATCH 03/10] fs: consistently use file_has_valid_mmap_hooks()
helper
On Mon, Jun 16, 2025 at 10:11:28PM -0700, Christoph Hellwig wrote:
> On Mon, Jun 16, 2025 at 08:33:22PM +0100, Lorenzo Stoakes 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().
> >
> > Additionally, commit bb666b7c2707 ("mm: add mmap_prepare() compatibility
> > layer for nested file systems") permits the use of the .mmap_prepare() hook
> > even in nested filesystems like overlayfs.
> >
> > There are a number of places where we check only for f_op->mmap - this is
> > incorrect now mmap_prepare exists, so update all of these to use the
> > general helper file_has_valid_mmap_hooks().
> >
> > Most notably, this updates the elf logic to allow for the ability to
> > execute binaries on filesystems which have the .mmap_prepare hook, but
> > additionally we update nested filesystems.
>
> Can you please give the function a better name before spreading it?
> file operations aren't hooks by any classic definition.
>
can_mmap_file()?
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