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@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 (2):
rust: rename AlwaysRefCounted to RefCounted
rust: adding 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/pid_namespace.rs | 8 +-
rust/kernel/task.rs | 6 +-
rust/kernel/types.rs | 404 ++++++++++++++++++++++++++++++++++++++--
8 files changed, 426 insertions(+), 31 deletions(-)
---
base-commit: 4b2ee22fe32ea9b255926effbb6f26450607c391
change-id: 20250305-unique-ref-29fcd675f9e9
Best regards,
--
Oliver Mangold <oliver.mangold@pm.me>