diff --git a/kernel/aster-nix/src/fs/device.rs b/kernel/aster-nix/src/fs/device.rs
index 229fde6c2..2cfafb276 100644
--- a/kernel/aster-nix/src/fs/device.rs
+++ b/kernel/aster-nix/src/fs/device.rs
@@ -125,7 +125,7 @@ pub fn add_node(device: Arc<dyn Device>, path: &str) -> Result<Arc<Dentry>> {
                     dentry = dentry.mknod(
                         next_name,
                         InodeMode::from_bits_truncate(0o666),
-                        device.clone(),
+                        device.clone().into(),
                     )?;
                 } else {
                     // Mkdir parent path
diff --git a/kernel/aster-nix/src/fs/devpts/mod.rs b/kernel/aster-nix/src/fs/devpts/mod.rs
index 1af688aab..3ca4db6c7 100644
--- a/kernel/aster-nix/src/fs/devpts/mod.rs
+++ b/kernel/aster-nix/src/fs/devpts/mod.rs
@@ -8,6 +8,7 @@ use aster_util::slot_vec::SlotVec;
 use id_alloc::IdAlloc;
 
 use self::{ptmx::Ptmx, slave::PtySlaveInode};
+use super::utils::MknodType;
 use crate::{
     device::PtyMaster,
     fs::{
@@ -222,7 +223,7 @@ impl Inode for RootInode {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn mknod(&self, name: &str, mode: InodeMode, dev: Arc<dyn Device>) -> Result<Arc<dyn Inode>> {
+    fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
         Err(Error::new(Errno::EPERM))
     }
 
diff --git a/kernel/aster-nix/src/fs/exfat/inode.rs b/kernel/aster-nix/src/fs/exfat/inode.rs
index 959dca178..897594ae6 100644
--- a/kernel/aster-nix/src/fs/exfat/inode.rs
+++ b/kernel/aster-nix/src/fs/exfat/inode.rs
@@ -28,11 +28,10 @@ use super::{
 use crate::{
     events::IoEvents,
     fs::{
-        device::Device,
         exfat::{dentry::ExfatDentryIterator, fat::ExfatChain, fs::ExfatFS},
         utils::{
-            DirentVisitor, Extension, Inode, InodeMode, InodeType, IoctlCmd, Metadata, PageCache,
-            PageCacheBackend,
+            DirentVisitor, Extension, Inode, InodeMode, InodeType, IoctlCmd, Metadata, MknodType,
+            PageCache, PageCacheBackend,
         },
     },
     prelude::*,
@@ -1444,7 +1443,7 @@ impl Inode for ExfatInode {
         Ok(result)
     }
 
-    fn mknod(&self, name: &str, mode: InodeMode, dev: Arc<dyn Device>) -> Result<Arc<dyn Inode>> {
+    fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
         return_errno_with_message!(Errno::EINVAL, "unsupported operation")
     }
 
diff --git a/kernel/aster-nix/src/fs/ext2/impl_for_vfs/inode.rs b/kernel/aster-nix/src/fs/ext2/impl_for_vfs/inode.rs
index bb2ddbd0d..206d98479 100644
--- a/kernel/aster-nix/src/fs/ext2/impl_for_vfs/inode.rs
+++ b/kernel/aster-nix/src/fs/ext2/impl_for_vfs/inode.rs
@@ -8,11 +8,10 @@ use aster_rights::Full;
 
 use crate::{
     fs::{
-        device::Device,
         ext2::{FilePerm, Inode as Ext2Inode},
         utils::{
             DirentVisitor, Extension, FallocMode, FileSystem, Inode, InodeMode, InodeType,
-            IoctlCmd, Metadata,
+            IoctlCmd, Metadata, MknodType,
         },
     },
     prelude::*,
@@ -131,9 +130,17 @@ impl Inode for Ext2Inode {
         Ok(self.create(name, type_, mode.into())?)
     }
 
-    fn mknod(&self, name: &str, mode: InodeMode, dev: Arc<dyn Device>) -> Result<Arc<dyn Inode>> {
-        let inode = self.create(name, InodeType::from(dev.type_()), mode.into())?;
-        inode.set_device_id(dev.id().into()).unwrap();
+    fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
+        let inode_type = type_.inode_type();
+        let inode = match type_ {
+            MknodType::CharDeviceNode(dev) | MknodType::BlockDeviceNode(dev) => {
+                let inode = self.create(name, inode_type, mode.into())?;
+                inode.set_device_id(dev.id().into()).unwrap();
+                inode
+            }
+            _ => todo!(),
+        };
+
         Ok(inode)
     }
 
diff --git a/kernel/aster-nix/src/fs/path/dentry.rs b/kernel/aster-nix/src/fs/path/dentry.rs
index 0f5e00982..b160ecd3a 100644
--- a/kernel/aster-nix/src/fs/path/dentry.rs
+++ b/kernel/aster-nix/src/fs/path/dentry.rs
@@ -12,9 +12,8 @@ use inherit_methods_macro::inherit_methods;
 
 use crate::{
     fs::{
-        device::Device,
         path::mount::MountNode,
-        utils::{FileSystem, Inode, InodeMode, InodeType, Metadata, NAME_MAX},
+        utils::{FileSystem, Inode, InodeMode, InodeType, Metadata, MknodType, NAME_MAX},
     },
     prelude::*,
     process::{Gid, Uid},
@@ -182,7 +181,7 @@ impl Dentry_ {
     }
 
     /// Create a Dentry_ by making a device inode.
-    pub fn mknod(&self, name: &str, mode: InodeMode, device: Arc<dyn Device>) -> Result<Arc<Self>> {
+    pub fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<Self>> {
         if self.inode.type_() != InodeType::Dir {
             return_errno!(Errno::ENOTDIR);
         }
@@ -192,7 +191,7 @@ impl Dentry_ {
         }
 
         let child = {
-            let inode = self.inode.mknod(name, mode, device)?;
+            let inode = self.inode.mknod(name, mode, type_)?;
             let dentry = Self::new(
                 inode,
                 DentryOptions::Leaf((String::from(name), self.this())),
@@ -622,9 +621,9 @@ impl Dentry {
         Ok(child_mount)
     }
 
-    /// Create a Dentry by making a device inode.
-    pub fn mknod(&self, name: &str, mode: InodeMode, device: Arc<dyn Device>) -> Result<Arc<Self>> {
-        let inner = self.inner.mknod(name, mode, device)?;
+    /// Create a Dentry by making a device inode or others.
+    pub fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<Self>> {
+        let inner = self.inner.mknod(name, mode, type_)?;
         Ok(Self::new(self.mount_node.clone(), inner.clone()))
     }
 
diff --git a/kernel/aster-nix/src/fs/procfs/template/dir.rs b/kernel/aster-nix/src/fs/procfs/template/dir.rs
index 212ddc087..a91e3154f 100644
--- a/kernel/aster-nix/src/fs/procfs/template/dir.rs
+++ b/kernel/aster-nix/src/fs/procfs/template/dir.rs
@@ -9,10 +9,7 @@ use inherit_methods_macro::inherit_methods;
 
 use super::{Common, ProcFS};
 use crate::{
-    fs::{
-        device::Device,
-        utils::{DirentVisitor, FileSystem, Inode, InodeMode, InodeType, Metadata},
-    },
+    fs::utils::{DirentVisitor, FileSystem, Inode, InodeMode, InodeType, Metadata, MknodType},
     prelude::*,
     process::{Gid, Uid},
 };
@@ -97,12 +94,7 @@ impl<D: DirOps + 'static> Inode for ProcDir<D> {
         Err(Error::new(Errno::EPERM))
     }
 
-    fn mknod(
-        &self,
-        _name: &str,
-        _mode: InodeMode,
-        _device: Arc<dyn Device>,
-    ) -> Result<Arc<dyn Inode>> {
+    fn mknod(&self, _name: &str, _mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
         Err(Error::new(Errno::EPERM))
     }
 
diff --git a/kernel/aster-nix/src/fs/ramfs/fs.rs b/kernel/aster-nix/src/fs/ramfs/fs.rs
index 65d9c4012..d20540e08 100644
--- a/kernel/aster-nix/src/fs/ramfs/fs.rs
+++ b/kernel/aster-nix/src/fs/ramfs/fs.rs
@@ -20,7 +20,7 @@ use crate::{
         device::Device,
         utils::{
             CStr256, DirentVisitor, Extension, FallocMode, FileSystem, FsFlags, Inode, InodeMode,
-            InodeType, IoctlCmd, Metadata, PageCache, PageCacheBackend, SuperBlock,
+            InodeType, IoctlCmd, Metadata, MknodType, PageCache, PageCacheBackend, SuperBlock,
         },
     },
     prelude::*,
@@ -676,12 +676,7 @@ impl Inode for RamInode {
         Ok(())
     }
 
-    fn mknod(
-        &self,
-        name: &str,
-        mode: InodeMode,
-        device: Arc<dyn Device>,
-    ) -> Result<Arc<dyn Inode>> {
+    fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
         if name.len() > NAME_MAX {
             return_errno!(Errno::ENAMETOOLONG);
         }
@@ -693,22 +688,27 @@ impl Inode for RamInode {
         if self_inode.inner.as_direntry().unwrap().contains_entry(name) {
             return_errno_with_message!(Errno::EEXIST, "entry exists");
         }
-        let device_inode = RamInode::new_device(
-            &self.fs.upgrade().unwrap(),
-            mode,
-            Uid::new_root(),
-            Gid::new_root(),
-            device,
-        );
+        let inode = match type_ {
+            MknodType::CharDeviceNode(device) | MknodType::BlockDeviceNode(device) => {
+                RamInode::new_device(
+                    &self.fs.upgrade().unwrap(),
+                    mode,
+                    Uid::new_root(),
+                    Gid::new_root(),
+                    device,
+                )
+            }
+            _ => return_errno_with_message!(Errno::EPERM, "unimplemented file types"),
+        };
 
         let mut self_inode = self_inode.upgrade();
         self_inode
             .inner
             .as_direntry_mut()
             .unwrap()
-            .append_entry(name, device_inode.clone());
+            .append_entry(name, inode.clone());
         self_inode.inc_size();
-        Ok(device_inode)
+        Ok(inode)
     }
 
     fn as_device(&self) -> Option<Arc<dyn Device>> {
diff --git a/kernel/aster-nix/src/fs/utils/inode.rs b/kernel/aster-nix/src/fs/utils/inode.rs
index efcab5818..7a01cdbb0 100644
--- a/kernel/aster-nix/src/fs/utils/inode.rs
+++ b/kernel/aster-nix/src/fs/utils/inode.rs
@@ -254,6 +254,33 @@ impl Metadata {
     }
 }
 
+pub enum MknodType {
+    NamedPipeNode,
+    CharDeviceNode(Arc<dyn Device>),
+    BlockDeviceNode(Arc<dyn Device>),
+}
+
+impl MknodType {
+    pub fn inode_type(&self) -> InodeType {
+        match self {
+            MknodType::NamedPipeNode => InodeType::NamedPipe,
+            MknodType::CharDeviceNode(_) => InodeType::CharDevice,
+            MknodType::BlockDeviceNode(_) => InodeType::BlockDevice,
+        }
+    }
+}
+
+impl From<Arc<dyn Device>> for MknodType {
+    fn from(device: Arc<dyn Device>) -> Self {
+        let inode_type: InodeType = device.type_().into();
+        match inode_type {
+            InodeType::CharDevice => Self::CharDeviceNode(device),
+            InodeType::BlockDevice => Self::BlockDeviceNode(device),
+            _ => unreachable!(),
+        }
+    }
+}
+
 pub trait Inode: Any + Sync + Send {
     fn size(&self) -> usize;
 
@@ -313,7 +340,7 @@ pub trait Inode: Any + Sync + Send {
         Err(Error::new(Errno::ENOTDIR))
     }
 
-    fn mknod(&self, name: &str, mode: InodeMode, dev: Arc<dyn Device>) -> Result<Arc<dyn Inode>> {
+    fn mknod(&self, name: &str, mode: InodeMode, type_: MknodType) -> Result<Arc<dyn Inode>> {
         Err(Error::new(Errno::ENOTDIR))
     }
 
diff --git a/kernel/aster-nix/src/fs/utils/mod.rs b/kernel/aster-nix/src/fs/utils/mod.rs
index bfcd022ba..86a72eaf5 100644
--- a/kernel/aster-nix/src/fs/utils/mod.rs
+++ b/kernel/aster-nix/src/fs/utils/mod.rs
@@ -11,7 +11,7 @@ pub use falloc_mode::FallocMode;
 pub use file_creation_mask::FileCreationMask;
 pub use flock::{FlockItem, FlockList, FlockType};
 pub use fs::{FileSystem, FsFlags, SuperBlock};
-pub use inode::{Extension, Inode, InodeMode, InodeType, Metadata};
+pub use inode::{Extension, Inode, InodeMode, InodeType, Metadata, MknodType};
 pub use ioctl::IoctlCmd;
 pub use page_cache::{PageCache, PageCacheBackend};
 pub use random_test::{generate_random_operation, new_fs_in_memory};
diff --git a/kernel/aster-nix/src/syscall/mknod.rs b/kernel/aster-nix/src/syscall/mknod.rs
index 8961c3b09..c3c7e245d 100644
--- a/kernel/aster-nix/src/syscall/mknod.rs
+++ b/kernel/aster-nix/src/syscall/mknod.rs
@@ -51,7 +51,7 @@ pub fn sys_mknodat(
         }
         InodeType::CharDevice | InodeType::BlockDevice => {
             let device_inode = get_device(dev)?;
-            let _ = dir_dentry.mknod(&name, inode_mode, device_inode)?;
+            let _ = dir_dentry.mknod(&name, inode_mode, device_inode.into())?;
         }
         InodeType::NamedPipe | InodeType::Socket => {
             return_errno_with_message!(Errno::EINVAL, "unsupported file types")