Commit f656279a authored by Danilo Krummrich's avatar Danilo Krummrich
Browse files

samples: rust: debugfs_scoped: add example for blobs 



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

Reviewed-by: default avatarAlice Ryhl <aliceryhl@google.com>
Reviewed-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Reviewed-by: default avatarMatthew Maurer <mmaurer@google.com>
Signed-off-by: default avatarDanilo Krummrich <dakr@kernel.org>
parent 35bd14d9

samples/rust/rust_debugfs_scoped.rs

+10 −4
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
use core::sync::atomic::AtomicUsize;

use kernel::debugfs::{Dir, Scope};

use kernel::prelude::*;

use kernel::sizes::*;

use kernel::sync::Mutex;

use kernel::{c_str, new_mutex, str::CString};
@@ -66,18 +67,22 @@ fn create_file_write( 
            GFP_KERNEL,

        )?;

    }

    let blob = KBox::pin_init(new_mutex!([0x42; SZ_4K]), GFP_KERNEL)?;



    let scope = KBox::pin_init(

        mod_data

            .device_dir

            .scope(DeviceData { name, nums }, &file_name, |dev_data, dir| {

        mod_data.device_dir.scope(

            DeviceData { name, nums, blob },

            &file_name,

            |dev_data, dir| {

                for (idx, val) in dev_data.nums.iter().enumerate() {

                    let Ok(name) = CString::try_from_fmt(fmt!("{idx}")) else {

                        return;

                    };

                    dir.read_write_file(&name, val);

                }

            }),

                dir.read_write_binary_file(c_str!("blob"), &dev_data.blob);

            },

        ),

        GFP_KERNEL,

    )?;

    (*mod_data.devices.lock()).push(scope, GFP_KERNEL)?;
@@ -110,6 +115,7 @@ fn init(device_dir: Dir) -> impl PinInit<Self> { 
struct DeviceData {

    name: CString,

    nums: KVec<AtomicUsize>,

    blob: Pin<KBox<Mutex<[u8; SZ_4K]>>>,

}



fn init_control(base_dir: &Dir, dyn_dirs: Dir) -> impl PinInit<Scope<ModuleData>> + '_ {