[PATCH v2 6/8] samples: rust: debugfs: add example for blobs

Danilo Krummrich
2025-10-20T22:28:06Z

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.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.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