diff --git a/include/direntry.h b/include/direntry.h
index ff4792d..859668b 100644
--- a/include/direntry.h
+++ b/include/direntry.h
@@ -5,20 +5,6 @@ typedef struct fileNode {
     char *Symbolink;
     struct treeNode *subdirectory;
     struct fileNode *next;
-    void serialize(char* buffer) {
-        u_int64_t t = inode_number;
-        for (int j = 0; j < 8; j++){
-            buffer[j] = t & (((u_int64_t)1<<(8))-1);
-            t >>= 8;
-        }
-        strcpy(buffer+8, name);
-    }
-    void deserialize(char* buffer) {
-        inode_number = 0;
-        for (int j = 0; j < 8; j++)
-            inode_number = inode_number | (((u_int64_t)(unsigned char)buffer[j])<<(8*j));
-        strcpy(name, buffer+8);
-    }
 } FileNode;
 
 typedef struct {
@@ -35,6 +21,7 @@ typedef struct treeNode {
 
 /*root directory have its own initialization, so parent wont be NULL*/
 int fischl_add_entry(TreeNode *parent, int new_inode_number, const char *fileName, INode *new_inode);
+int fischl_rm_entry(TreeNode *parent, const char *fileName);
 /*if want to use dir mode use the subdirectory treeNode pointer */
 //e.g. FileNode *Dirnode = fischl_find_entry(); can see file inside with Dirnode->subdirectory
 //e.g. go to the current Dirnode parent directory, use TreeNode *get_Dir_parent = Dirnode->subdirectory->parent;
diff --git a/lib/direntry.cpp b/lib/direntry.cpp
index 12eb1c9..738de41 100644
--- a/lib/direntry.cpp
+++ b/lib/direntry.cpp
@@ -43,6 +43,29 @@ FileNode *lookupHash(HashTable *h, char *key) {
     return NULL; // Not found
 }
 
+bool removeHash(HashTable *h, char *key) {
+    unsigned int hashval = hash(h, key);
+    FileNode *node = h->table[hashval];
+    if (node == NULL) return false;
+    if (strcmp(node->name, key) == 0) {
+        h->table[hashval] = node->next;
+        return true;
+    }
+    FileNode *prev = NULL;
+    bool foundit = false;
+    while (node != NULL) {
+        if (strcmp(node->name, key) == 0) break;
+        prev = node;
+        node = node->next;
+    }
+    if (node == NULL) {
+        return false;
+    } else {
+        prev->next = node->next;
+        return true;
+    }
+}
+
 TreeNode *createDirectory(const char *dirName, TreeNode *parent, int hashSize) {
     TreeNode *newDir = (TreeNode *)malloc(sizeof(TreeNode));
     newDir->dirName = strdup(dirName);
@@ -148,6 +171,20 @@ int fischl_add_entry(TreeNode *parent, int new_inode_number, const char *fileNam
     return 0;
 }
 
+int fischl_rm_entry(TreeNode *parent, const char *fileName) {
+    char *fileName_dup = strdup(fileName);
+    if (parent->contents == NULL) return -1;
+    FileNode *file = NULL;
+    file = lookupHash(parent->contents, fileName_dup);
+    if (file == NULL) return -1;
+    if (file->subdirectory != NULL) freeTree(file->subdirectory);
+    removeHash(parent->contents, fileName_dup);
+    free(file->name);
+    free(file);
+    delete fileName_dup;
+}
+
+
 FileNode *fischl_find_entry(TreeNode *root, const char *path){
     //support . and .. function
     char *pathCopy = strdup(path);
diff --git a/test/CMakeLists.txt b/test/CMakeLists.txt
index 82ccfd4..77b3786 100644
--- a/test/CMakeLists.txt
+++ b/test/CMakeLists.txt
@@ -14,6 +14,7 @@ add_executable(${TARGET_LAYER1_API}
     layer1_API.cpp
 )
 add_executable(${TARGET_LAYER2_API}
+    ../lib/direntry.cpp
     ../lib/files.cpp
     layer2_API.cpp
 )
diff --git a/test/dir_API.cpp b/test/dir_API.cpp
index fb93b31..5d56cb6 100644
--- a/test/dir_API.cpp
+++ b/test/dir_API.cpp
@@ -84,6 +84,16 @@ int main() {
     }else{
         printf(" %s under %s\n",get_file3->name,get_dir1_tree->dirName);
     }
+    // pressure test
+    INode inode_fileN;
+    for(int i=6;i<100;i++) {
+        fischl_add_entry(get_dir1_tree, i, (std::string("file")+std::to_string(i)).c_str(), &inode_fileN);
+    }
+    for(int i=6;i<100;i++){
+        FileNode *get_fileN = fischl_find_entry(get_dir1_tree, (std::string("file")+std::to_string(i)).c_str());
+        assert(get_fileN != NULL);
+        assert(get_fileN->inode_number == i);
+    }
     // Cleanup
     freeTree(root);