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rust: types: add try_from_foreign() method

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Currently `ForeignOwnable::from_foreign()` only works for non-null
pointers for the existing `impl`s (e.g. `Box`, `Arc`). In turn, this
means callers may write code like:

```rust
// `p` is a pointer that may be null.
if p.is_null() {
    None
} else {
    unsafe { Some(Self::from_foreign(ptr)) }
}
```

Add a `try_from_foreign()` method to the trait with a default
implementation that returns `None` if `ptr` is null, otherwise
`Some(from_foreign(ptr))`, so that it can be used by callers instead.

Link: https://github.com/Rust-for-Linux/linux/issues/1057
Signed-off-by: Obei Sideg <linux@obei.io>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Reviewed-by: Trevor Gross <tmgross@umich.edu>
Link: https://lore.kernel.org/r/0100018d53f737f8-80c1fe97-0019-40d7-ab69-b1b192785cd7-000000@email.amazonses.com
[ Fixed intra-doc links, improved `SAFETY` comment and reworded commit. ]
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
This commit is contained in:
Obei Sideg 2024-01-29 06:45:27 +00:00 committed by Miguel Ojeda
parent e3c3d34507
commit 5bc818419a
1 changed files with 19 additions and 0 deletions
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19
rust/kernel/types.rs
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@ -46,6 +46,25 @@ pub trait ForeignOwnable: Sized {
/// Additionally, all instances (if any) of values returned by [`ForeignOwnable::borrow`] for
/// this object must have been dropped.
unsafe fn from_foreign(ptr: *const core::ffi::c_void) -> Self;
/// Tries to convert a foreign-owned object back to a Rust-owned one.
///
/// A convenience wrapper over [`ForeignOwnable::from_foreign`] that returns [`None`] if `ptr`
/// is null.
///
/// # Safety
///
/// `ptr` must either be null or satisfy the safety requirements for
/// [`ForeignOwnable::from_foreign`].
unsafe fn try_from_foreign(ptr: *const core::ffi::c_void) -> Option<Self> {
if ptr.is_null() {
None
} else {
// SAFETY: Since `ptr` is not null here, then `ptr` satisfies the safety requirements
// of `from_foreign` given the safety requirements of this function.
unsafe { Some(Self::from_foreign(ptr)) }
}
}
}
impl<T: 'static> ForeignOwnable for Box<T> {