[RFC PATCH 1/3] rust: kernel: types: add mode wrapper

[Daniel Sedlak <daniel@sedlak.dev>]

Add rust variant for representing file mode. This is needed
in order to set file permissions.

Signed-off-by: Daniel Sedlak <daniel@sedlak.dev>
---
 rust/kernel/types.rs | 17 +++++++++++++++++
 1 file changed, 17 insertions(+)

diff --git a/rust/kernel/types.rs b/rust/kernel/types.rs
index ec6457bb3084..35ac2898433a 100644
--- a/rust/kernel/types.rs
+++ b/rust/kernel/types.rs
@@ -517,3 +517,20 @@ pub enum Either<L, R> {
 /// [`NotThreadSafe`]: type@NotThreadSafe
 #[allow(non_upper_case_globals)]
 pub const NotThreadSafe: NotThreadSafe = PhantomData;
+
+/// Mode represents file permissions.
+///
+/// TODO: add link to header files.
+pub struct Mode(bindings::umode_t);
+
+impl Mode {
+    /// Creates [`Mode`] from the number.
+    pub const fn from_u16(num: u16) -> Self {
+        Self(num)
+    }
+
+    /// Returns [`Mode`] as an number.
+    pub const fn as_u16(&self) -> u16 {
+        self.0
+    }
+}
-- 
2.47.1