Re: [PATCH v9 0/8] File abstractions needed by Rust Binder

[Alice Ryhl]

On Mon, Sep 2, 2024 at 10:02 AM Christian Brauner <brauner@xxxxxxxxxx> wrote:
>
> On Thu, Aug 08, 2024 at 04:15:43PM GMT, Alice Ryhl wrote:
> > This patchset contains the file abstractions needed by the Rust
> > implementation of the Binder driver.
> >
> > Please see the Rust Binder RFC for usage examples:
> > https://lore.kernel.org/rust-for-linux/20231101-rust-binder-v1-0-08ba9197f637@xxxxxxxxxx/
> >
> > Users of "rust: types: add `NotThreadSafe`":
> >       [PATCH 5/9] rust: file: add `FileDescriptorReservation`
> >
> > Users of "rust: task: add `Task::current_raw`":
> >       [PATCH 7/9] rust: file: add `Kuid` wrapper
> >       [PATCH 8/9] rust: file: add `DeferredFdCloser`
> >
> > Users of "rust: file: add Rust abstraction for `struct file`":
> >       [PATCH RFC 02/20] rust_binder: add binderfs support to Rust binder
> >       [PATCH RFC 03/20] rust_binder: add threading support
> >
> > Users of "rust: cred: add Rust abstraction for `struct cred`":
> >       [PATCH RFC 05/20] rust_binder: add nodes and context managers
> >       [PATCH RFC 06/20] rust_binder: add oneway transactions
> >       [PATCH RFC 11/20] rust_binder: send nodes in transaction
> >       [PATCH RFC 13/20] rust_binder: add BINDER_TYPE_FD support
> >
> > Users of "rust: security: add abstraction for secctx":
> >       [PATCH RFC 06/20] rust_binder: add oneway transactions
> >
> > Users of "rust: file: add `FileDescriptorReservation`":
> >       [PATCH RFC 13/20] rust_binder: add BINDER_TYPE_FD support
> >       [PATCH RFC 14/20] rust_binder: add BINDER_TYPE_FDA support
> >
> > Users of "rust: file: add `Kuid` wrapper":
> >       [PATCH RFC 05/20] rust_binder: add nodes and context managers
> >       [PATCH RFC 06/20] rust_binder: add oneway transactions
> >
> > Users of "rust: file: add abstraction for `poll_table`":
> >       [PATCH RFC 07/20] rust_binder: add epoll support
> >
> > This patchset has some uses of read_volatile in place of READ_ONCE.
> > Please see the following rfc for context on this:
> > https://lore.kernel.org/all/20231025195339.1431894-1-boqun.feng@xxxxxxxxx/
> >
> > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx>
> > ---
>
> So, this won't make v6.12 anymore. There already were pretty big changes
> around files for the coming cycle so I did not also want to throw this
> into the mix as well. (Sorry that this had to miss it's birthday, Alice.)

This has also gained a conflict with the helpers split [1] in
rust-next, so maybe that is for the best.

I will look into whether any other changes are needed given what is
going in for 6.12 and send a new version. It looks like you already
added it to an vfs.rust.file branch, and it doesn't look like anything
in vfs.file required changes in this series.

[1]: https://lore.kernel.org/r/20240815103016.2771842-1-nmi@xxxxxxxxxxxx

> However, I do intend to merge a version for this for v6.13. There's some
> wrapping of struct cred and specifically of struct secctx that I can
> only handwave at. Ideally you get a nod from the LSM maintainers as well
> but if that doesn't come in I don't see much point in making this sit in
> limbo indefinitely.

Okay thanks! I can look into that.

Alice