diff --git a/Cargo.lock b/Cargo.lock
index 7903362..d6bff6c 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -307,9 +307,9 @@ dependencies = [
 
 [[package]]
 name = "ext4plus"
-version = "0.1.0-alpha.7"
+version = "0.1.0-beta.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "9dc277b4b40b9c396d5519685fa08c9feada784011646ce7f40fa8ec68baf8e5"
+checksum = "a25bd6af4472ec54e136bc5bf6e3f9556d35df5c5e554cc4092d40a57372530b"
 dependencies = [
  "async-lock",
  "async-trait",
diff --git a/libkernel/Cargo.toml b/libkernel/Cargo.toml
index 3c27571..64cbf1c 100644
--- a/libkernel/Cargo.toml
+++ b/libkernel/Cargo.toml
@@ -35,7 +35,7 @@ tock-registers = { version = "0.10.1", optional = true }
 
 # fs
 async-trait = { workspace = true, optional = true }
-ext4plus = { version = "0.1.0-alpha.7", optional = true }
+ext4plus = { version = "0.1.0-beta.1", optional = true }
 
 # proc_vm
 object = { version = "0.38.0", default-features = false, features = ["core", "elf", "read_core"], optional = true }
diff --git a/libkernel/src/fs/filesystems/ext4/mod.rs b/libkernel/src/fs/filesystems/ext4/mod.rs
index 45d40ab..0a7604b 100644
--- a/libkernel/src/fs/filesystems/ext4/mod.rs
+++ b/libkernel/src/fs/filesystems/ext4/mod.rs
@@ -371,8 +371,8 @@ where
     }
 
     async fn link(&self, name: &str, inode: Arc<dyn Inode>) -> Result<()> {
-        let inner = self.inner.lock().await;
-        let inner_dir = match &*inner {
+        let mut inner = self.inner.lock().await;
+        let inner_dir = match &mut *inner {
             InodeInner::Directory(d) => d,
             _ => return Err(KernelError::NotSupported),
         };
@@ -400,8 +400,8 @@ where
     }
 
     async fn unlink(&self, name: &str) -> Result<()> {
-        let inner = self.inner.lock().await;
-        let inner_dir = match &*inner {
+        let mut inner = self.inner.lock().await;
+        let inner_dir = match &mut *inner {
             InodeInner::Directory(d) => d,
             _ => return Err(KernelError::NotSupported),
         };
@@ -462,10 +462,10 @@ where
             .lock()
             .await
             .clone();
-        let old_parent_dir = Dir::open_inode(&fs.inner, old_parent_inode)?;
+        let mut old_parent_dir = Dir::open_inode(&fs.inner, old_parent_inode)?;
 
-        let inner = self.inner.lock().await;
-        let inner_dir = match &*inner {
+        let mut inner = self.inner.lock().await;
+        let inner_dir = match &mut *inner {
             InodeInner::Directory(d) => d,
             _ => return Err(KernelError::NotSupported),
         };
@@ -554,14 +554,11 @@ where
     }
 
     async fn symlink(&self, name: &str, target: &Path) -> Result<()> {
-        let inner = self.inner.lock().await;
-        let inner_dir = match &*inner {
+        let mut inner = self.inner.lock().await;
+        let inner_dir = match &mut *inner {
             InodeInner::Directory(d) => d,
             _ => return Err(KernelError::NotSupported),
         };
-        if inner.file_type() != ext4plus::FileType::Directory {
-            return Err(KernelError::NotSupported);
-        }
         let fs = self.fs_ref.upgrade().unwrap();
         fs.inner
             .symlink(