Add as_device method for file handle

services/libs/jinux-std/src/fs/devpts/ptmx.rs

@@ -119,8 +119,13 @@ impl Inode for Ptmx {
     fn fs(&self) -> Arc<dyn FileSystem> {
         self.devpts()
     }
+
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        Some(Arc::new(self.inner))
+    }
 }
 
+#[derive(Clone, Copy)]
 struct Inner;
 
 impl Device for Inner {

services/libs/jinux-std/src/fs/devpts/slave.rs

@@ -107,4 +107,8 @@ impl Inode for PtySlaveInode {
     fn fs(&self) -> Arc<dyn FileSystem> {
         self.fs.upgrade().unwrap()
     }
+
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        Some(self.device.clone())
+    }
 }

services/libs/jinux-std/src/fs/file_handle.rs

@@ -1,7 +1,8 @@
 //! Opend File Handle
 
-use crate::events::{IoEvents, Observer};
-use crate::fs::utils::{AccessMode, IoctlCmd, Metadata, SeekFrom, StatusFlags};
+use crate::events::Observer;
+use crate::fs::device::Device;
+use crate::fs::utils::{AccessMode, IoEvents, IoctlCmd, Metadata, Poller, SeekFrom, StatusFlags};
 use crate::net::socket::Socket;
 use crate::prelude::*;
 use crate::process::signal::Poller;
@@ -73,6 +74,10 @@ pub trait FileLike: Send + Sync + Any {
     fn as_socket(&self) -> Option<&dyn Socket> {
         None
     }
+
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        None
+    }
 }
 
 impl dyn FileLike {

services/libs/jinux-std/src/fs/inode_handle/dyn_cap.rs

@@ -107,4 +107,8 @@ impl FileLike for InodeHandle<Rights> {
         // Close does not guarantee that the data has been successfully saved to disk.
         Ok(())
     }
+
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        self.dentry().vnode().as_device()
+    }
 }

services/libs/jinux-std/src/fs/inode_handle/mod.rs

@@ -5,6 +5,7 @@ mod static_cap;
 
 use core::sync::atomic::{AtomicU32, Ordering};
 
+use crate::fs::device::Device;
 use crate::fs::file_handle::FileLike;
 use crate::fs::utils::{
     AccessMode, Dentry, DirentVisitor, InodeType, IoctlCmd, Metadata, SeekFrom, StatusFlags,

services/libs/jinux-std/src/fs/ramfs/fs.rs

@@ -574,6 +574,10 @@ impl Inode for RamInode {
         Ok(device_inode)
     }
 
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        self.0.read().inner.as_device().cloned()
+    }
+
     fn create(&self, name: &str, type_: InodeType, mode: InodeMode) -> Result<Arc<dyn Inode>> {
         if self.0.read().metadata.type_ != InodeType::Dir {
             return_errno_with_message!(Errno::ENOTDIR, "self is not dir");

services/libs/jinux-std/src/fs/utils/inode.rs

@@ -285,6 +285,10 @@ pub trait Inode: Any + Sync + Send {
         Err(Error::new(Errno::ENOTDIR))
     }
 
+    fn as_device(&self) -> Option<Arc<dyn Device>> {
+        None
+    }
+
     fn readdir_at(&self, offset: usize, visitor: &mut dyn DirentVisitor) -> Result<usize> {
         Err(Error::new(Errno::ENOTDIR))
     }