rust: file: Add flags() method to File

danobi · danobi · commit 53df0405759b · 2022-01-02T14:48:11.000-08:00
It's useful to know the flags associated with a file.

Signed-off-by: Daniel Xu &lt;dxu@dxuuu.xyz&gt;
diff --git a/rust/kernel/file.rs b/rust/kernel/file.rs
@@ -54,6 +54,12 @@ impl File {
         // change over the lifetime of a file).
         unsafe { CredentialRef::from_ptr(ptr) }
     }
+
+    /// Returns the flags associated with the file.
+    pub fn flags(&self) -> u32 {
+        // SAFETY: `File::ptr` is guaranteed to be valid by the type invariants.
+        unsafe { (*self.ptr).f_flags }
+    }
 }
 
 impl Drop for File {

Original file line number	Diff line number	Diff line change
`@@ -54,6 +54,12 @@ impl File {`
`54`	`54`	`// change over the lifetime of a file).`
`55`	`55`	`unsafe { CredentialRef::from_ptr(ptr) }`
`56`	`56`	`}`
	`57`	`+`
	`58`	`+ /// Returns the flags associated with the file.`
	`59`	`+ pub fn flags(&self) -> u32 {`
	`60`	+ // SAFETY: `File::ptr` is guaranteed to be valid by the type invariants.
	`61`	`+ unsafe { (*self.ptr).f_flags }`
	`62`	`+ }`
`57`	`63`	`}`
`58`	`64`
`59`	`65`	`impl Drop for File {`