diff --git a/rcore-fs-sfs/src/lib.rs b/rcore-fs-sfs/src/lib.rs
index 0b61166..1bd0f0d 100644
--- a/rcore-fs-sfs/src/lib.rs
+++ b/rcore-fs-sfs/src/lib.rs
@@ -406,6 +406,21 @@ impl INodeImpl {
         child.nlinks_inc();
         Ok(())
     }
+
+    pub fn call_ioctl(&self, request: u32, data: *mut u8) -> Result<(), IOCTLError> {
+        if self.metadata().unwrap().type_ != vfs::FileType::CharDevice {
+            return Err(IOCTLError::NotCharDevice);
+        }
+        let device_inodes = self.fs.device_inodes.read();
+        let device_inode = device_inodes.get(&self.device_inode_id);
+        match device_inode {
+            Some(x) => { x.ioctl(request, data) }
+            None => {
+                warn!("cannot find corresponding device inode in call_inoctl");
+                Err(IOCTLError::NotCharDevice)
+            }
+        }
+    }
 }
 
 impl vfs::INode for INodeImpl {
@@ -836,13 +851,6 @@ impl SimpleFileSystem {
         self.device_inodes.write().insert(device_inode_id, device_inode);
     }
 
-    pub fn get_device_inode(&self, device_inode_id: usize) -> vfs::Result<Arc<DeviceINode>> {
-        match self.device_inodes.read().get(&device_inode_id) {
-            Some(x) => Ok(Arc::clone(x)),
-            None => Err(FsError::DeviceError)
-        }
-    }
-
     /// Create a new INode struct, then insert it to self.inodes
     /// Private used for load or create INode
     fn _new_inode(&self, id: INodeId, disk_inode: Dirty<DiskINode>) -> Arc<INodeImpl> {
diff --git a/rcore-fs-sfs/src/structs.rs b/rcore-fs-sfs/src/structs.rs
index fd84e98..b8e09e9 100644
--- a/rcore-fs-sfs/src/structs.rs
+++ b/rcore-fs-sfs/src/structs.rs
@@ -55,7 +55,23 @@ pub trait DeviceINode : Any + Sync + Send{
 }
 */
 
-pub type DeviceINode = vfs::INode;
+// pub type DeviceINode = vfs::INode;
+pub trait DeviceINode : vfs::INode {
+    fn ioctl(&self, request: u32, data: *mut u8) -> Result<(), IOCTLError>;
+}
+
+impl DeviceINode {
+    fn ioctl(&self, request: u32, data: *mut u8) -> Result<(), IOCTLError> {
+        Ok(())
+    }
+}
+
+pub enum IOCTLError {
+    NotValidFD = 9, // EBADF
+    NotValidMemory = 14, // EFAULT
+    NotValidParam = 22, // EINVAL
+    NotCharDevice = 25, // ENOTTY
+}
 
 #[repr(C)]
 pub struct IndirectBlock {