sugar/linux
1
0
Fork 0
Code Activity

samples: rust: debugfs_scoped: add example for blobs

Browse Source 
Extend the rust_debugfs_scoped sample to demonstrate how to export a
large binary object through a ScopedDir.

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 16:30:44 +02:00
parent 35bd14d929
commit f656279afd
1 changed files with 10 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

14
samples/rust/rust_debugfs_scoped.rs
View File

@@ -9,6 +9,7 @@
use core::sync::atomic::AtomicUsize; use core::sync::atomic::AtomicUsize;
use kernel::debugfs::{Dir, Scope}; use kernel::debugfs::{Dir, Scope};
use kernel::prelude::*; use kernel::prelude::*;
use kernel::sizes::*;
use kernel::sync::Mutex; use kernel::sync::Mutex;
use kernel::{c_str, new_mutex, str::CString}; use kernel::{c_str, new_mutex, str::CString};
@@ -66,18 +67,22 @@ fn create_file_write(
GFP_KERNEL, GFP_KERNEL,
)?; )?;
} }
let blob = KBox::pin_init(new_mutex!([0x42; SZ_4K]), GFP_KERNEL)?;
let scope = KBox::pin_init( let scope = KBox::pin_init(
mod_data mod_data.device_dir.scope(
.device_dir DeviceData { name, nums, blob },
.scope(DeviceData { name, nums }, &file_name, |dev_data, dir| { &file_name,
|dev_data, dir| {
for (idx, val) in dev_data.nums.iter().enumerate() { for (idx, val) in dev_data.nums.iter().enumerate() {
let Ok(name) = CString::try_from_fmt(fmt!("{idx}")) else { let Ok(name) = CString::try_from_fmt(fmt!("{idx}")) else {
return; return;
}; };
dir.read_write_file(&name, val); dir.read_write_file(&name, val);
} }
}), dir.read_write_binary_file(c_str!("blob"), &dev_data.blob);
},
),
GFP_KERNEL, GFP_KERNEL,
)?; )?;
(*mod_data.devices.lock()).push(scope, GFP_KERNEL)?; (*mod_data.devices.lock()).push(scope, GFP_KERNEL)?;
@@ -110,6 +115,7 @@ impl ModuleData {
struct DeviceData { struct DeviceData {
name: CString, name: CString,
nums: KVec<AtomicUsize>, nums: KVec<AtomicUsize>,
blob: Pin<KBox<Mutex<[u8; SZ_4K]>>>,
} }
fn init_control(base_dir: &Dir, dyn_dirs: Dir) -> impl PinInit<Scope<ModuleData>> + '_ { fn init_control(base_dir: &Dir, dyn_dirs: Dir) -> impl PinInit<Scope<ModuleData>> + '_ {