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samples: rust: debugfs: add example for blobs

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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>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: Matthew Maurer <mmaurer@google.com>
Signed-off-by: Danilo Krummrich <dakr@kernel.org>
This commit is contained in:
Danilo Krummrich
2025-10-22 16:30:42 +02:00
parent a9fca8a7b2
commit 52af0c3796
1 changed files with 13 additions and 0 deletions
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13
samples/rust/rust_debugfs.rs
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@@ -38,6 +38,7 @@ use kernel::c_str;
use kernel::debugfs::{Dir, File}; use kernel::debugfs::{Dir, File};
use kernel::new_mutex; use kernel::new_mutex;
use kernel::prelude::*; use kernel::prelude::*;
use kernel::sizes::*;
use kernel::sync::Mutex; use kernel::sync::Mutex;
use kernel::{acpi, device::Core, of, platform, str::CString, types::ARef}; use kernel::{acpi, device::Core, of, platform, str::CString, types::ARef};
@@ -62,6 +63,10 @@ struct RustDebugFs {
counter: File<AtomicUsize>, counter: File<AtomicUsize>,
#[pin] #[pin]
inner: File<Mutex<Inner>>, inner: File<Mutex<Inner>>,
#[pin]
array_blob: File<Mutex<[u8; 4]>>,
#[pin]
vector_blob: File<Mutex<KVec<u8>>>,
} }
#[derive(Debug)] #[derive(Debug)]
@@ -144,6 +149,14 @@ impl RustDebugFs {
), ),
counter <- Self::build_counter(&debugfs), counter <- Self::build_counter(&debugfs),
inner <- Self::build_inner(&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, _debugfs: debugfs,
pdev: pdev.into(), pdev: pdev.into(),
} }