Re: [PATCH v19 4/8] rust: page: convert to `Ownable`

On Fri, Jun 26, 2026 at 1:56 PM Andreas Hindborg [off-list ref] wrote:

From: Asahi Lina <redacted>

This allows Page references to be returned as borrowed references,
without necessarily owning the struct page.

Remove `BorrowedPage` and update users to use `Owned<Page>`.

Signed-off-by: Asahi Lina <redacted>
[ Andreas: Fix formatting and add a safety comment, update users. ]
Signed-off-by: Andreas Hindborg <a.hindborg@kernel.org>
Reviewed-by: Gary Guo <gary@garyguo.net>

Reviewed-by: Alice Ryhl <aliceryhl@google.com>

     /// Returns a raw pointer to the page.
     pub fn as_ptr(&self) -> *mut bindings::page {
-        self.page.as_ptr()
+        Opaque::cast_into(&self.page)

cast_into() is mainly used when you have a raw pointer to opaque. When
you have a reference, you can just do self.page.get()

Alice