diff --git a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystem.java b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
index 83a4938f5..752758a4e 100644
--- a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
+++ b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystem.java
@@ -17,7 +17,7 @@ import java.net.URI;
 
 public class SeaweedFileSystem extends org.apache.hadoop.fs.FileSystem {
 
-    public static final int FS_SEAWEED_DEFAULT_PORT = 8333;
+    public static final int FS_SEAWEED_DEFAULT_PORT = 8888;
     public static final String FS_SEAWEED_FILER_HOST = "fs.seaweed.filer.host";
     public static final String FS_SEAWEED_FILER_PORT = "fs.seaweed.filer.port";
 
@@ -87,10 +87,10 @@ public class SeaweedFileSystem extends org.apache.hadoop.fs.FileSystem {
 
     public boolean rename(Path src, Path dst) throws IOException {
 
-        Path parentFolder = src.getParent();
-        if (parentFolder == null) {
+        if (src.isRoot()) {
             return false;
         }
+
         if (src.equals(dst)) {
             return true;
         }
diff --git a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
index 0ab17a2b5..d58d07ea8 100644
--- a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
+++ b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedFileSystemStore.java
@@ -9,6 +9,7 @@ import org.slf4j.LoggerFactory;
 import seaweedfs.client.FilerGrpcClient;
 import seaweedfs.client.FilerProto;
 
+import java.io.FileNotFoundException;
 import java.io.IOException;
 import java.io.OutputStream;
 import java.util.ArrayList;
@@ -26,6 +27,19 @@ public class SeaweedFileSystemStore {
         filerGrpcClient = new FilerGrpcClient(host, grpcPort);
     }
 
+    static String getParentDirectory(Path path) {
+        return path.isRoot() ? "/" : path.getParent().toUri().getPath();
+    }
+
+    static int permissionToMode(FsPermission permission, boolean isDirectory) {
+        int p = permission.toShort();
+        if (isDirectory) {
+            p = p | 1 << 31;
+        }
+        System.out.println(permission + " = " + p);
+        return p;
+    }
+
     public boolean createDirectory(final Path path, UserGroupInformation currentUser,
                                    final FsPermission permission, final FsPermission umask) {
 
@@ -37,14 +51,14 @@ public class SeaweedFileSystemStore {
         long now = System.currentTimeMillis() / 1000L;
 
         FilerProto.CreateEntryRequest.Builder request = FilerProto.CreateEntryRequest.newBuilder()
-            .setDirectory(path.getParent().toUri().getPath())
+            .setDirectory(getParentDirectory(path))
             .setEntry(FilerProto.Entry.newBuilder()
                 .setName(path.getName())
                 .setIsDirectory(true)
                 .setAttributes(FilerProto.FuseAttributes.newBuilder()
                     .setMtime(now)
                     .setCrtime(now)
-                    .setFileMode(permission.toShort())
+                    .setFileMode(permissionToMode(permission, true))
                     .setUserName(currentUser.getUserName())
                     .addAllGroupName(Arrays.asList(currentUser.getGroupNames())))
             );
@@ -76,7 +90,7 @@ public class SeaweedFileSystemStore {
             .build()).getEntriesList();
     }
 
-    public FileStatus getFileStatus(final Path path) {
+    public FileStatus getFileStatus(final Path path) throws FileNotFoundException {
         LOG.debug("getFileStatus path: {}", path);
 
         FilerProto.Entry entry = lookupEntry(path);
@@ -90,9 +104,13 @@ public class SeaweedFileSystemStore {
             String.valueOf(isDirectroy),
             String.valueOf(recursive));
 
+        if (path.isRoot()) {
+            return true;
+        }
+
         FilerProto.DeleteEntryResponse response =
             filerGrpcClient.getBlockingStub().deleteEntry(FilerProto.DeleteEntryRequest.newBuilder()
-                .setDirectory(path.getParent().toUri().getPath())
+                .setDirectory(getParentDirectory(path))
                 .setName(path.getName())
                 .setIsDirectory(isDirectroy)
                 .setIsDeleteData(true)
@@ -101,7 +119,6 @@ public class SeaweedFileSystemStore {
         return true;
     }
 
-
     private FileStatus getFileStatus(Path path, FilerProto.Entry entry) {
         FilerProto.FuseAttributes attributes = entry.getAttributes();
         long length = attributes.getFileSize();
@@ -117,18 +134,26 @@ public class SeaweedFileSystemStore {
             modification_time, access_time, permission, owner, group, null, path);
     }
 
+    private FilerProto.Entry lookupEntry(Path path) throws FileNotFoundException {
 
-    private FilerProto.Entry lookupEntry(Path path) {
-        FilerProto.LookupDirectoryEntryResponse response =
-            filerGrpcClient.getBlockingStub().lookupDirectoryEntry(FilerProto.LookupDirectoryEntryRequest.newBuilder()
-                .setDirectory(path.getParent().toUri().getPath())
-                .setName(path.getName())
-                .build());
+        String directory = getParentDirectory(path);
 
-        return response.getEntry();
+        try {
+            FilerProto.LookupDirectoryEntryResponse response =
+                filerGrpcClient.getBlockingStub().lookupDirectoryEntry(FilerProto.LookupDirectoryEntryRequest.newBuilder()
+                    .setDirectory(directory)
+                    .setName(path.getName())
+                    .build());
+            return response.getEntry();
+        } catch (io.grpc.StatusRuntimeException e) {
+            throw new FileNotFoundException(e.getMessage());
+        }
     }
 
-    public void rename(Path source, Path destination) {
+    public void rename(Path source, Path destination) throws FileNotFoundException {
+        if (source.isRoot()) {
+            return;
+        }
         FilerProto.Entry entry = lookupEntry(source);
         moveEntry(source.getParent(), entry, destination);
     }
@@ -146,7 +171,7 @@ public class SeaweedFileSystemStore {
         }
 
         filerGrpcClient.getBlockingStub().createEntry(FilerProto.CreateEntryRequest.newBuilder()
-            .setDirectory(destination.getParent().toUri().getPath())
+            .setDirectory(getParentDirectory(destination))
             .build());
 
         filerGrpcClient.getBlockingStub().deleteEntry(FilerProto.DeleteEntryRequest.newBuilder()
@@ -186,7 +211,7 @@ public class SeaweedFileSystemStore {
         if (entry == null) {
             entry = FilerProto.Entry.newBuilder()
                 .setAttributes(FilerProto.FuseAttributes.newBuilder()
-                    .setFileMode(permission.toOctal())
+                    .setFileMode(permissionToMode(permission, false))
                     .setReplication(replication)
                     .setCrtime(System.currentTimeMillis() / 1000L)
                     .setUserName(userGroupInformation.getUserName())
diff --git a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java
index a360d828a..cfe0e1c24 100644
--- a/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java
+++ b/other/java/hdfs/src/main/java/seaweed/hdfs/SeaweedWrite.java
@@ -14,6 +14,8 @@ import java.io.ByteArrayInputStream;
 import java.io.IOException;
 import java.io.InputStream;
 
+import static seaweed.hdfs.SeaweedFileSystemStore.getParentDirectory;
+
 public class SeaweedWrite {
 
     public static void writeData(FilerProto.Entry.Builder entry,
@@ -50,7 +52,7 @@ public class SeaweedWrite {
                                  final Path path, final FilerProto.Entry.Builder entry) {
         filerGrpcClient.getBlockingStub().createEntry(
             FilerProto.CreateEntryRequest.newBuilder()
-                .setDirectory(path.getParent().toUri().getPath())
+                .setDirectory(getParentDirectory(path))
                 .setEntry(entry)
                 .build()
         );