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A DRM File is the DRM counterpart to a kernel file structure, representing an open DRM file descriptor. Add a Rust abstraction to allow drivers to implement their own File types that implement the DriverFile trait. Reviewed-by: Maxime Ripard <mripard@kernel.org> Signed-off-by: Asahi Lina <lina@asahilina.net> Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io> Reviewed-by: Lyude Paul <lyude@redhat.com> Link: https://lore.kernel.org/r/20250410235546.43736-7-dakr@kernel.org [ Rework of drm::File * switch to the Opaque<T> type * fix (mutable) references to struct drm_file (which in this context is UB) * restructure and rename functions to align with common kernel schemes * write and fix safety and invariant comments * remove necessity for and convert 'as' casts * original source archive: https://archive.is/GH8oy - Danilo ] Signed-off-by: Danilo Krummrich <dakr@kernel.org>