rust: debugfs: support binary large objects for ScopedDir

Add support for creating binary debugfs files via ScopedDir. This
mirrors the existing functionality for Dir, but without producing an
owning handle -- files are automatically removed when the associated
Scope is dropped.

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Matthew Maurer <mmaurer@google.com>
Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>

rust/kernel/debugfs.rs

@@ -530,6 +530,20 @@ impl<'data, 'dir> ScopedDir<'data, 'dir> {
         self.create_file(name, data, &T::FILE_OPS)
     }
 
+    /// Creates a read-only binary file in this directory.
+    ///
+    /// The file's contents are produced by invoking [`BinaryWriter::write_to_slice`].
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn read_binary_file<T: BinaryWriter + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        self.create_file(name, data, &T::FILE_OPS)
+    }
+
     /// Creates a read-only file in this directory, with contents from a callback.
     ///
     /// The file contents are generated by calling `f` with `data`.
@@ -567,6 +581,22 @@ impl<'data, 'dir> ScopedDir<'data, 'dir> {
         self.create_file(name, data, vtable)
     }
 
+    /// Creates a read-write binary file in this directory.
+    ///
+    /// Reading the file uses the [`BinaryWriter`] implementation on `data`. Writing to the file
+    /// uses the [`BinaryReader`] implementation on `data`.
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn read_write_binary_file<T: BinaryWriter + BinaryReader + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        let vtable = &<T as BinaryReadWriteFile<_>>::FILE_OPS;
+        self.create_file(name, data, vtable)
+    }
+
     /// Creates a read-write file in this directory, with logic from callbacks.
     ///
     /// Reading from the file is handled by `f`. Writing to the file is handled by `w`.
@@ -606,6 +636,20 @@ impl<'data, 'dir> ScopedDir<'data, 'dir> {
         self.create_file(name, data, vtable)
     }
 
+    /// Creates a write-only binary file in this directory.
+    ///
+    /// Writing to the file uses the [`BinaryReader`] implementation on `data`.
+    ///
+    /// This function does not produce an owning handle to the file. The created file is removed
+    /// when the [`Scope`] that this directory belongs to is dropped.
+    pub fn write_binary_file<T: BinaryReader + Send + Sync + 'static>(
+        &self,
+        name: &CStr,
+        data: &'data T,
+    ) {
+        self.create_file(name, data, &T::FILE_OPS)
+    }
+
     /// Creates a write-only file in this directory, with write logic from a callback.
     ///
     /// Writing to the file is handled by `w`.