linux-kernel - [PATCH 5/7] samples: rust: debugfs: add example for blobs

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Message-ID: <20251003222729.322059-6-dakr@kernel.org>
Date: Sat,  4 Oct 2025 00:26:42 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: gregkh@...uxfoundation.org,
	rafael@...nel.org,
	ojeda@...nel.org,
	alex.gaynor@...il.com,
	boqun.feng@...il.com,
	gary@...yguo.net,
	bjorn3_gh@...tonmail.com,
	lossin@...nel.org,
	a.hindborg@...nel.org,
	aliceryhl@...gle.com,
	tmgross@...ch.edu,
	mmaurer@...gle.com
Cc: rust-for-linux@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Danilo Krummrich <dakr@...nel.org>
Subject: [PATCH 5/7] samples: rust: debugfs: add example for blobs

Extend the Rust debugfs sample to demonstrate usage of binary file
support. The example now shows how to expose both fixed-size arrays
and dynamically sized vectors as binary blobs in debugfs.

Signed-off-by: Danilo Krummrich <dakr@...nel.org>
---
 samples/rust/rust_debugfs.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/samples/rust/rust_debugfs.rs b/samples/rust/rust_debugfs.rs
index 82b61a15a34b..75ceb95276fa 100644
--- a/samples/rust/rust_debugfs.rs
+++ b/samples/rust/rust_debugfs.rs
@@ -38,6 +38,7 @@
 use kernel::debugfs::{Dir, File};
 use kernel::new_mutex;
 use kernel::prelude::*;
+use kernel::sizes::*;
 use kernel::sync::Mutex;
 
 use kernel::{acpi, device::Core, of, platform, str::CString, types::ARef};
@@ -62,6 +63,10 @@ struct RustDebugFs {
     counter: File<AtomicUsize>,
     #[pin]
     inner: File<Mutex<Inner>>,
+    #[pin]
+    array_blob: File<Mutex<[u8; 4]>>,
+    #[pin]
+    vector_blob: File<Mutex<KVec<u8>>>,
 }
 
 #[derive(Debug)]
@@ -143,6 +148,14 @@ fn new(pdev: &platform::Device<Core>) -> impl PinInit<Self, Error> + '_ {
                 ),
                 counter <- Self::build_counter(&debugfs),
                 inner <- Self::build_inner(&debugfs),
+                array_blob <- debugfs.read_write_binary_file(
+                    c_str!("array_blob"),
+                    new_mutex!([0x62, 0x6c, 0x6f, 0x62]),
+                ),
+                vector_blob <- debugfs.read_write_binary_file(
+                    c_str!("vector_blob"),
+                    new_mutex!(kernel::kvec!(0x42; SZ_4K)?),
+                ),
                 _debugfs: debugfs,
                 pdev: pdev.into(),
             }
-- 
2.51.0