linux-kernel - [PATCH v14 0/2] rust: xarray: Add a minimal abstraction for XArray

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Message-Id: <20241217-rust-xarray-bindings-v14-0-9fef3cefcb41@gmail.com>
Date: Tue, 17 Dec 2024 10:28:16 -0500
From: Tamir Duberstein <tamird@...il.com>
To: Danilo Krummrich <dakr@...nel.org>, 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>, Matthew Wilcox <willy@...radead.org>
Cc: Maíra Canal <mcanal@...lia.com>, 
 Asahi Lina <lina@...hilina.net>, rust-for-linux@...r.kernel.org, 
 linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tamir Duberstein <tamird@...il.com>
Subject: [PATCH v14 0/2] rust: xarray: Add a minimal abstraction for XArray

This is a reimagining relative to earlier versions[0] by Asahi Lina and
Maíra Canal.

It is needed to support rust-binder, though this version only provides
enough machinery to support rnull.

Link: https://lore.kernel.org/rust-for-linux/20240309235927.168915-2-mcanal@igalia.com/ [0]
---
Changes in v14:
- Remove TODO made stale by Gary Guo's FFI type series.
- Link: https://lore.kernel.org/all/20240913213041.395655-5-gary@garyguo.net/
- Link to v13: https://lore.kernel.org/r/20241213-rust-xarray-bindings-v13-0-8655164e624f@gmail.com

Changes in v13:
- Replace `bool::then` with `if`. (Miguel Ojeda)
- Replace `match` with `let` + `if`. (Miguel Ojeda)
- Link to v12: https://lore.kernel.org/r/20241212-rust-xarray-bindings-v12-0-59ab9b1f4d2e@gmail.com

Changes in v12:
- Import `core::ptr::NonNull`. (Alice Ryhl)
- Introduce `StoreError` to allow `?` to be used with `Guard::store`.
  (Alice Ryhl)
- Replace `{crate,core}::ffi::c_ulong` and clarify TODO with respect to
  `usize`. (Alice Ryhl)
- Drop `T: Sync` bound on `impl Sync for XArray<T>`. (Alice Ryhl)
- Reword `Send` and `Sync` safety comments to match the style used in
  `lock.rs`. (Alice Ryhl and Andreas
  Hindborg)
- Link to v11: https://lore.kernel.org/r/20241203-rust-xarray-bindings-v11-0-58a95d137ec2@gmail.com

Changes in v11:
- Consolidate imports. (Alice Ryhl)
- Use literal `0` rather than `MIN`. (Alice Ryhl)
- Use bulleted list in SAFETY comment. (Alice Ryhl)
- Document (un)locking behavior of `Guard::store`. (Alice Ryhl)
- Document Normal API behavior WRT `XA_ZERO_ENTRY`. (Alice Ryhl)
- Rewrite `unsafe impl Sync` SAFETY comment. (Andreas Hindborg)
- Link to v10: https://lore.kernel.org/r/20241120-rust-xarray-bindings-v10-0-a25b2b0bf582@gmail.com

Changes in v10:
- Guard::get takes &self instead of &mut self. (Andreas Hindborg)
- Guard is !Send. (Boqun Feng)
- Add Inspired-by tags. (Maíra Canal and Asahi Lina)
- Rebase on linux-next, use NotThreadSafe. (Alice Ryhl)
- Link to v9: https://lore.kernel.org/r/20241118-rust-xarray-bindings-v9-0-3219cdb53685@gmail.com

---
Tamir Duberstein (2):
      rust: types: add `ForeignOwnable::PointedTo`
      rust: xarray: Add an abstraction for XArray

 rust/bindings/bindings_helper.h |   6 +
 rust/helpers/helpers.c          |   1 +
 rust/helpers/xarray.c           |  28 ++++
 rust/kernel/alloc.rs            |   5 +
 rust/kernel/alloc/kbox.rs       |  38 +++---
 rust/kernel/lib.rs              |   1 +
 rust/kernel/miscdevice.rs       |   6 +-
 rust/kernel/sync/arc.rs         |  21 +--
 rust/kernel/types.rs            |  46 ++++---
 rust/kernel/xarray.rs           | 279 ++++++++++++++++++++++++++++++++++++++++
 10 files changed, 386 insertions(+), 45 deletions(-)
---
base-commit: fac04efc5c793dccbd07e2d59af9f90b7fc0dca4
change-id: 20241020-rust-xarray-bindings-bef514142968
prerequisite-change-id: 20241030-borrow-mut-75f181feef4c:v6
prerequisite-patch-id: f801fb31bb4f202b3327f5fdb50d3018e25347d1
prerequisite-patch-id: b57aa4f44b238d4cb80f00276a188d9ba0c743cc
prerequisite-patch-id: 2387ec5af1cc03614d3dff5a95cefcd243befd65
prerequisite-patch-id: 75e26dd500888d9a27f8eac3d8304eab8d75c366
prerequisite-patch-id: 7f845443f373f975a888f01c3761fe8aa04b8a3c
prerequisite-patch-id: 5a9856c7363b33f0adfe8658e076b35abf960d23

Best regards,
-- 
Tamir Duberstein <tamird@...il.com>