Re: [MAINTAINERS/KERNEL SUMMIT] Trust and maintenance of file systems

Linus Torvalds
2023-09-13T17:04:16Z

On Wed, 13 Sept 2023 at 09:52, Eric Sandeen <sandeen@sandeen.net> wrote:
>
> Isn't it more typical to mark something as on its way to deprecation in
> Kconfig and/or a printk?

I haven't actually heard a good reason to really stop supporting
these. Using some kind of user-space library is ridiculous. It's *way*
more effort than just keeping them in the kernel. So anybody who says
"just move them to user space" is just making things up.

The reasons I have heard are:

- security

Yes, don't enable them, and if you enable them, don't auto-mount them
on hot-pkug devices. Simple. People in this thread have already
pointed to the user-space support for it happening.

- syzbot issues.

Ignore them for affs & co.

- "they use the buffer cache".

Waah, waah, waah. The buffer cache is *trivial*. If you don't like the
buffer cache, don't use it. It's that simple.

But not liking the buffer cache and claiming that's a reason to not
support a filesystem is just complete BS.

Linus