linux-kernel - [PATCH v9 0/5] New trait OwnableRefCounted for ARef<->Owned conversion.

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Message-ID: <20250325-unique-ref-v9-0-e91618c1de26@pm.me>
Date: Tue, 25 Mar 2025 11:56:41 +0000
From: Oliver Mangold <oliver.mangold@...me>
To: Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, Björn Roy Baron <bjorn3_gh@...tonmail.com>, Benno Lossin <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>, Trevor Gross <tmgross@...ch.edu>, Asahi Lina <lina@...hilina.net>
Cc: rust-for-linux@...r.kernel.org, linux-kernel@...r.kernel.org, Oliver Mangold <oliver.mangold@...me>
Subject: [PATCH v9 0/5] New trait OwnableRefCounted for ARef<->Owned conversion.

This allows to convert between ARef<T> and Owned<T> by
implementing the new trait OwnedRefCounted.

This way we will have a shared/unique reference counting scheme
for types with built-in refcounts in analogy to Arc/UniqueArc.

Signed-off-by: Oliver Mangold <oliver.mangold@...me>
---
Changes in v9:
- Rebase onto v6.14-rc7
- Move Ownable/OwnedRefCounted/Ownable, etc., into separate module
- Documentation fixes to Ownable/OwnableMut/OwnableRefCounted
- Add missing SAFETY documentation to ARef example
- Link to v8: https://lore.kernel.org/r/20250313-unique-ref-v8-0-3082ffc67a31@pm.me

Changes in v8:
- Fix Co-developed-by and Suggested-by tags as suggested by Miguel and Boqun
- Some small documentation fixes in Owned/Ownable patch
- removing redundant trait constraint on DerefMut for Owned as suggested by Boqun Feng
- make SimpleOwnedRefCounted no longer implement RefCounted as suggested by Boqun Feng
- documentation for RefCounted as suggested by Boqun Feng
- Link to v7: https://lore.kernel.org/r/20250310-unique-ref-v7-0-4caddb78aa05@pm.me

Changes in v7:
- Squash patch to make Owned::from_raw/into_raw public into parent
- Added Signed-off-by to other people's commits
- Link to v6: https://lore.kernel.org/r/20250310-unique-ref-v6-0-1ff53558617e@pm.me

Changes in v6:
- Changed comments/formatting as suggested by Miguel Ojeda
- Included and used new config flag RUSTC_HAS_DO_NOT_RECOMMEND,
  thus no changes to types.rs will be needed when the attribute
  becomes available.
- Fixed commit message for Owned patch.
- Link to v5: https://lore.kernel.org/r/20250307-unique-ref-v5-0-bffeb633277e@pm.me

Changes in v5:
- Rebase the whole thing on top of the Ownable/Owned traits by Asahi Lina.
- Rename AlwaysRefCounted to RefCounted and make AlwaysRefCounted a
  marker trait instead to allow to obtain an ARef<T> from an &T,
  which (as Alice pointed out) is unsound when combined with UniqueRef/Owned.
- Change the Trait design and naming to implement this feature,
  UniqueRef/UniqueRefCounted is dropped in favor of Ownable/Owned and
  OwnableRefCounted is used to provide the functions to convert
  between Owned and ARef.
- Link to v4: https://lore.kernel.org/r/20250305-unique-ref-v4-1-a8fdef7b1c2c@pm.me

Changes in v4:
- Just a minor change in naming by request from Andreas Hindborg,
  try_shared_to_unique() -> try_from_shared(),
  unique_to_shared() -> into_shared(),
  which is more in line with standard Rust naming conventions.
- Link to v3: https://lore.kernel.org/r/Z8Wuud2UQX6Yukyr@mango

---
Asahi Lina (1):
      rust: types: Add Ownable/Owned types

Miguel Ojeda (1):
      rust: kbuild: provide `RUSTC_HAS_DO_NOT_RECOMMEND` symbol

Oliver Mangold (3):
      rust: Rename AlwaysRefCounted to RefCounted
      rust: Add missing SAFETY documentation for ARef example
      rust: Add OwnableRefCounted and SimpleOwnableRefCounted

 init/Kconfig                    |   3 +
 rust/kernel/block/mq/request.rs |  10 +-
 rust/kernel/cred.rs             |   8 +-
 rust/kernel/device.rs           |   8 +-
 rust/kernel/fs/file.rs          |  10 +-
 rust/kernel/lib.rs              |   1 +
 rust/kernel/ownable.rs          | 361 ++++++++++++++++++++++++++++++++++++++++
 rust/kernel/pid_namespace.rs    |   8 +-
 rust/kernel/task.rs             |   6 +-
 rust/kernel/types.rs            |  53 +++---
 10 files changed, 436 insertions(+), 32 deletions(-)
---
base-commit: 4701f33a10702d5fc577c32434eb62adde0a1ae1
change-id: 20250305-unique-ref-29fcd675f9e9

Best regards,
-- 
Oliver Mangold <oliver.mangold@...me>