Re: [PATCH v4 01/12] mm/shmem: Introduce F_SEAL_INACCESSIBLE

[Paolo Bonzini]

On 3/7/22 14:26, Chao Peng wrote:
> > In pseudo-Rust, this is the difference between:
> >
> > fn convert_to_private(in: &mut Memfd)
> >
> > and
> >
> > fn convert_to_private(in: Memfd) -> PrivateMemoryFd
> >
> > This doesn't map particularly nicely to the kernel, though.
> I understand this Rust semantics and the difficulty to handle races.
> Probably we should not expose F_SEAL_INACCESSIBLE to userspace, instead
> we can use a new in-kernel flag to indicate the same thing. That flag
> should be set only when the memfd is created with MFD_INACCESSIBLE.

Yes, I like this.

Paolo