Various Rust bindings for files [LWN.net]

From:		Alice Ryhl <aliceryhl-AT-google.com>
To:		rust-for-linux-AT-vger.kernel.org, linux-fsdevel-AT-vger.kernel.org, Miguel Ojeda <ojeda-AT-kernel.org>, Alexander Viro <viro-AT-zeniv.linux.org.uk>, Christian Brauner <brauner-AT-kernel.org>
Subject:		[RFC PATCH v1 0/5] Various Rust bindings for files
Date:		Thu, 20 Jul 2023 15:28:15 +0000
Message-ID:		<20230720152820.3566078-1-aliceryhl@google.com>
Cc:		Wedson Almeida Filho <wedsonaf-AT-gmail.com>, Alex Gaynor <alex.gaynor-AT-gmail.com>, Boqun Feng <boqun.feng-AT-gmail.com>, Gary Guo <gary-AT-garyguo.net>, "Björn Roy Baron" <bjorn3_gh-AT-protonmail.com>, Benno Lossin <benno.lossin-AT-proton.me>, Alice Ryhl <aliceryhl-AT-google.com>, linux-kernel-AT-vger.kernel.org, patches-AT-lists.linux.dev
Archive-link:		Article

This contains bindings for various file related things that binder needs
to use.

I would especially like feedback on the SAFETY comments. Particularly,
the safety comments in patch 4 and 5 are non-trivial. For example:

 * In patch 4, I claim that passing POLLHUP|POLLFREE to __wake_up is
   enough to ensure that we can now destroy the wait_list without
   risking any use-after-frees, even if we have registered it with
   epoll. Is that correct?

 * In patch 5, I implement a utility for closing fds that might be held
   using `fdget`. This is rather non-trivial, and I would be happy to
   hear suggestions about alternate solutions.

This patch is based on top of
https://lore.kernel.org/all/20230426204923.16195-1-amicul...
which is currently the top commit on rust-next.

Alice Ryhl (2):
  rust: file: add bindings for `poll_table`
  rust: file: add `DeferredFdCloser`

Wedson Almeida Filho (3):
  rust: file: add bindings for `struct file`
  rust: cred: add Rust bindings for `struct cred`
  rust: file: add `FileDescriptorReservation`

 rust/bindings/bindings_helper.h |   8 +
 rust/bindings/lib.rs            |   1 +
 rust/helpers.c                  |  36 ++++
 rust/kernel/cred.rs             |  66 +++++++
 rust/kernel/file.rs             | 331 ++++++++++++++++++++++++++++++++
 rust/kernel/file/poll_table.rs  |  93 +++++++++
 rust/kernel/lib.rs              |   2 +
 rust/kernel/sync/condvar.rs     |   2 +-
 8 files changed, 538 insertions(+), 1 deletion(-)
 create mode 100644 rust/kernel/cred.rs
 create mode 100644 rust/kernel/file.rs
 create mode 100644 rust/kernel/file/poll_table.rs


base-commit: 341faf2b45ba266d52c1ca886c4ffca52d666786
-- 
2.41.0.255.g8b1d071c50-goog