diff --git a/include/files.h b/include/files.h
index 0f51c6a..3f2b70d 100644
--- a/include/files.h
+++ b/include/files.h
@@ -14,6 +14,7 @@ class FilesOperation {
     void initialize_rootinode();
     void printDirectory(u_int64_t);
     u_int64_t create_new_inode(u_int64_t parent_inode_number, const char* name, mode_t mode);
+    // int unlink_inode(u_int64_t inode_number);
     u_int64_t namei(const char* path);
     u_int64_t fischl_mkdir(const char*, mode_t);
     u_int64_t fischl_mknod(const char*, mode_t);
diff --git a/lib/files.cpp b/lib/files.cpp
index 48c31f9..3ce2cb6 100644
--- a/lib/files.cpp
+++ b/lib/files.cpp
@@ -137,6 +137,7 @@ void FilesOperation::initialize_rootinode() {
 }
 
 void FilesOperation::printDirectory(u_int64_t inode_number) {
+    // limit to first datablock
     INode inode;
     inode.inode_construct(inode_number, disk);
     char buffer[IO_BLOCK_SIZE] = {0};
@@ -144,7 +145,7 @@ void FilesOperation::printDirectory(u_int64_t inode_number) {
     DirectoryEntry ent;
     for(int i=0;i<=IO_BLOCK_SIZE-64;i+=64){
         ent.deserialize(buffer+i);
-        printf("%d(%s)\t", i, ent.file_name);
+        if (ent.inode_number) printf("%s\t%llu;\t", ent.file_name, ent.inode_number);
     }
     printf("\n");
 }
@@ -161,29 +162,39 @@ u_int64_t FilesOperation::create_new_inode(u_int64_t parent_inode_number, const
         printf("Parent Inode is not a directory\n");
         return -1;
     }
-    char buffer[IO_BLOCK_SIZE] = {0};
-    if (inode.size > 0) read_datablock(inode, 0, buffer);
-    
-    // do create inode
+
     u_int64_t new_inode_number = 0;
-    DirectoryEntry ent;
-    for(int i=0;i<=IO_BLOCK_SIZE-64;i+=64){
-        ent.deserialize(buffer+i);
-        if (ent.inode_number == 0) {
-            new_inode_number = inop.inode_allocate(disk);
-            ent.inode_number = new_inode_number;
-            strcpy(ent.file_name, name);
-            ent.serialize(buffer+i);
+
+    char rw_buffer[IO_BLOCK_SIZE] = {0};
+    for (u_int64_t idx=0; idx<inode.size; idx++) {
+        read_datablock(inode, idx, rw_buffer);
+        DirectoryEntry ent;
+        for(int i=0;i<=IO_BLOCK_SIZE-64;i+=64){
+            ent.deserialize(rw_buffer+i);
+            if (ent.inode_number == 0) {
+                new_inode_number = inop.inode_allocate(disk);
+                ent.inode_number = new_inode_number;
+                strcpy(ent.file_name, name);
+                ent.serialize(rw_buffer+i);
+                break;
+            }
+        }
+        if (new_inode_number) {
+            write_datablock(inode, idx, rw_buffer);
             break;
         }
     }
-    if (new_inode_number == 0) {
-        perror("Failed to create file in directory: First datablock full");
-        return -1;
-    } else {
-        write_datablock(inode, 0, buffer);
+    
+    if (!new_inode_number) {
+        char write_buffer[IO_BLOCK_SIZE] = {0};
+        DirectoryEntry ent;
+        new_inode_number = inop.inode_allocate(disk);
+        ent.inode_number = new_inode_number;
+        strcpy(ent.file_name, name);
+        ent.serialize(write_buffer);
+        write_datablock(inode, inode.size, write_buffer);
+        inode.inode_save(disk);
     }
-    inode.inode_save(disk);
 
     // initialize new file
     INode *get_inode = new_inode(new_inode_number, mode);
@@ -212,16 +223,20 @@ u_int64_t FilesOperation::namei(const char* path) {
             printf("namei: %s is not a non-empty directory\n", current_dirname.c_str());
             return -1;
         }
-        char buffer[IO_BLOCK_SIZE] = {0};
-        read_datablock(inode, 0, buffer);
         u_int64_t new_inode_number = 0;
-        DirectoryEntry ent;
-        for(int i=0;i<=IO_BLOCK_SIZE-64;i+=64){
-            ent.deserialize(buffer+i);
-            if (strcmp(ent.file_name, new_name.c_str()) == 0) {
-                new_inode_number = ent.inode_number;
-                break;
+
+        char buffer[IO_BLOCK_SIZE] = {0};
+        for(u_int64_t idx=0; idx<inode.size; idx++) {
+            read_datablock(inode, idx, buffer);
+            DirectoryEntry ent;
+            for(int i=0;i<=IO_BLOCK_SIZE-64;i+=64){
+                ent.deserialize(buffer+i);
+                if (strcmp(ent.file_name, new_name.c_str()) == 0) {
+                    new_inode_number = ent.inode_number;
+                    break;
+                }
             }
+            if (new_inode_number) break;
         }
         if (!new_inode_number) {
             printf("namei: no name matching %s under directory %s\n", new_name.c_str(), current_dirname.c_str());
@@ -238,7 +253,6 @@ u_int64_t FilesOperation::namei(const char* path) {
     // path = "/notnonemptydir/foo" should raise error
 }
 
-/**/
 u_int64_t FilesOperation::fischl_mkdir(const char* path, mode_t mode) {
     //check path
     char *pathdup = strdup(path);
diff --git a/test/layer2_API.cpp b/test/layer2_API.cpp
index 91d0202..164b632 100644
--- a/test/layer2_API.cpp
+++ b/test/layer2_API.cpp
@@ -1,5 +1,5 @@
 #include <stdio.h>
-#include <string.h>
+#include <string>
 #include <assert.h>
 #include "files.h"
 
@@ -19,8 +19,10 @@ int main(int argc, char *argv[]) {
     printf("/test is inode %llu, it is a file\n", file1);
     u_int64_t file2 = fsop.fischl_mkdir("/foo",0);
     printf("/foo is inode %llu, it is a directory\n", file2);
+    fsop.printDirectory(1);
     u_int64_t file3 = fsop.fischl_mkdir("/foo/bar",0);
     printf("/foo/bar is inode %llu, it is a directory\n", file3);
+    fsop.printDirectory(file2);
     u_int64_t file4 = fsop.fischl_mknod("/foo/bar/baz",0);
     printf("/foo/bar/baz is inode %llu, it is a file\n", file4);
     // the following three testcases will fail
@@ -73,4 +75,17 @@ int main(int argc, char *argv[]) {
     assert(read_buffer[0] == '4');
     fsop.read_datablock(inode_read, 101, read_buffer);
     assert(read_buffer[0] == '5');
+
+    // pressure test create directory
+    printf("=== Part 5: pressure test create files ===\n");
+    u_int64_t file_pressure = fsop.fischl_mkdir("/pressure", 0);
+    u_int64_t inode_numbers[700];
+    std::string prefix = "/pressure/";
+    for(int i=0;i<700;i++){
+        inode_numbers[i] = fsop.fischl_mkdir((prefix+std::to_string(i)).c_str(), 0);
+    }
+    for(int i=0;i<700;i++){
+        u_int64_t inode_number = fsop.namei((prefix+std::to_string(i)).c_str());
+        assert(inode_number == inode_numbers[i]);
+    }
 }
\ No newline at end of file