diff --git a/src/fdcache_entity.cpp b/src/fdcache_entity.cpp
index ee73d2d..49d0ea3 100644
--- a/src/fdcache_entity.cpp
+++ b/src/fdcache_entity.cpp
@@ -907,6 +907,13 @@ bool FdEntity::UpdateMtime(bool clear_holding_mtime)
             if(!ClearHoldingMtime(AutoLock::ALREADY_LOCKED)){
                 return false;
             }
+            // [NOTE]
+            // If come here after fdatasync has been processed, the file
+            // content update has already taken place. However, the metadata
+            // update is necessary and needs to be flagged in order to
+            // perform it with flush,
+            //
+            pending_status = pending_status_t::UPDATE_META_PENDING;
         }
     }else{
         struct stat st;
@@ -1426,19 +1433,23 @@ int FdEntity::RowFlush(int fd, const char* tpath, AutoLock::Type type, bool forc
 
     AutoLock auto_lock2(&fdent_data_lock);
 
-    if(!force_sync && !pagelist.IsModified()){
+    int result;
+    if(!force_sync && !pagelist.IsModified() && !IsDirtyMetadata()){
         // nothing to update.
         return 0;
     }
-
     if(S3fsLog::IsS3fsLogDbg()){
         pagelist.Dump();
     }
 
-    int result;
     if(nomultipart){
         // No multipart upload
-        result = RowFlushNoMultipart(pseudo_obj, tpath);
+        if(!force_sync && !pagelist.IsModified()){
+            // for only push pending headers
+            result = UploadPending(-1, AutoLock::ALREADY_LOCKED);
+        }else{
+            result = RowFlushNoMultipart(pseudo_obj, tpath);
+        }
     }else if(FdEntity::streamupload){
         // Stream multipart upload
         result = RowFlushStreamMultipart(pseudo_obj, tpath);
@@ -1523,6 +1534,7 @@ int FdEntity::RowFlushNoMultipart(const PseudoFdInfo* pseudo_obj, const char* tp
     if(0 == result){
         pagelist.ClearAllModified();
     }
+
     return result;
 }
 
@@ -2573,6 +2585,29 @@ bool FdEntity::IsDirtyNewFile() const
     return (pending_status_t::CREATE_FILE_PENDING == pending_status);
 }
 
+// [NOTE]
+// The fdatasync call only uploads the content but does not update
+// the meta data. In the flush call, if there is no update contents,
+// need to upload only metadata, so use these functions.
+//
+void FdEntity::MarkDirtyMetadata()
+{
+    AutoLock auto_lock(&fdent_lock);
+    AutoLock auto_lock2(&fdent_data_lock);
+
+    if(pending_status_t::NO_UPDATE_PENDING == pending_status){
+        pending_status = pending_status_t::UPDATE_META_PENDING;
+    }
+}
+
+bool FdEntity::IsDirtyMetadata() const
+{
+    // [NOTE]
+    // fdent_lock must be previously locked.
+    //
+    return (pending_status_t::UPDATE_META_PENDING == pending_status);
+}
+
 bool FdEntity::AddUntreated(off_t start, off_t size)
 {
     bool result = untreated_list.AddPart(start, size);
diff --git a/src/fdcache_entity.h b/src/fdcache_entity.h
index 5c34a3a..9ed91f7 100644
--- a/src/fdcache_entity.h
+++ b/src/fdcache_entity.h
@@ -97,6 +97,8 @@ class FdEntity
 
         bool AddUntreated(off_t start, off_t size);
 
+        bool IsDirtyMetadata() const;
+
     public:
         static bool GetNoMixMultipart() { return mixmultipart; }
         static bool SetNoMixMultipart();
@@ -156,6 +158,7 @@ class FdEntity
 
         void MarkDirtyNewFile();
         bool IsDirtyNewFile() const;
+        void MarkDirtyMetadata();
 
         bool GetLastUpdateUntreatedPart(off_t& start, off_t& size) const;
         bool ReplaceLastUpdateUntreatedPart(off_t front_start, off_t front_size, off_t behind_start, off_t behind_size);
diff --git a/src/s3fs.cpp b/src/s3fs.cpp
index c746f6f..aefd110 100644
--- a/src/s3fs.cpp
+++ b/src/s3fs.cpp
@@ -3047,7 +3047,7 @@ static int s3fs_fsync(const char* _path, int datasync, struct fuse_file_info* fi
     WTF8_ENCODE(path)
     int result = 0;
 
-    FUSE_CTX_INFO("[path=%s][pseudo_fd=%llu]", path, (unsigned long long)(fi->fh));
+    FUSE_CTX_INFO("[path=%s][datasync=%d][pseudo_fd=%llu]", path, datasync, (unsigned long long)(fi->fh));
 
     AutoFdEntity autoent;
     FdEntity*    ent;
@@ -3060,6 +3060,16 @@ static int s3fs_fsync(const char* _path, int datasync, struct fuse_file_info* fi
         }
         result = ent->Flush(static_cast<int>(fi->fh), AutoLock::NONE, false);
 
+        if(0 != datasync){
+            // [NOTE]
+            // The metadata are not updated when fdatasync is called.
+            // Instead of it, these metadata are pended and set the dirty flag here.
+            // Setting this flag allows metadata to be updated even if there is no
+            // content update between the fdatasync call and the flush call.
+            //
+            ent->MarkDirtyMetadata();
+        }
+
         if(is_new_file){
             // update parent directory timestamp
             int update_result;
diff --git a/test/integration-test-main.sh b/test/integration-test-main.sh
index 92a05d5..cfbdbe2 100755
--- a/test/integration-test-main.sh
+++ b/test/integration-test-main.sh
@@ -408,8 +408,6 @@ function test_external_modification {
     local OBJECT_NAME; OBJECT_NAME=$(basename "${PWD}")/"${TEST_TEXT_FILE}"
     echo "new new" | aws_cli s3 cp - "s3://${TEST_BUCKET_1}/${OBJECT_NAME}"
 
-    wait_ostype 1 "Darwin"
-
     cmp "${TEST_TEXT_FILE}" <(echo "new new")
     rm -f "${TEST_TEXT_FILE}"
 }
@@ -884,7 +882,6 @@ function test_mtime_file {
 
     #copy the test file with preserve mode
     cp -p "${TEST_TEXT_FILE}" "${ALT_TEST_TEXT_FILE}"
-    wait_ostype 1 "Darwin"
 
     local testmtime; testmtime=$(get_mtime "${TEST_TEXT_FILE}")
     local testctime; testctime=$(get_ctime "${TEST_TEXT_FILE}")
@@ -953,7 +950,6 @@ function test_update_time_chown() {
     local base_atime; base_atime=$(get_atime "${TEST_TEXT_FILE}")
     local base_ctime; base_ctime=$(get_ctime "${TEST_TEXT_FILE}")
     local base_mtime; base_mtime=$(get_mtime "${TEST_TEXT_FILE}")
-    wait_ostype 1 "Darwin"
 
     # [NOTE]
     # In this test, chown is called with the same UID.
@@ -1050,7 +1046,6 @@ function test_update_time_touch_a() {
     # "touch -a" -> update ctime/atime, not update mtime
     #
     touch -a "${TEST_TEXT_FILE}"
-    wait_ostype 1 "Darwin"
 
     local atime; atime=$(get_atime "${TEST_TEXT_FILE}")
     local ctime; ctime=$(get_ctime "${TEST_TEXT_FILE}")
@@ -1119,6 +1114,8 @@ function test_update_time_cp_p() {
        echo "cp with -p option expected updated ctime: $base_ctime != $ctime and same mtime: $base_mtime == $mtime, atime: $base_atime == $atime"
        return 1
     fi
+    rm_test_file
+    rm_test_file "${TIME_TEST_TEXT_FILE}"
 }
 
 function test_update_time_mv() {
@@ -1425,7 +1422,6 @@ function test_update_parent_directory_time_sub() {
     local base_atime; base_atime=$(get_atime "${TEST_PARENTDIR_PARENT}")
     local base_ctime; base_ctime=$(get_ctime "${TEST_PARENTDIR_PARENT}")
     local base_mtime; base_mtime=$(get_mtime "${TEST_PARENTDIR_PARENT}")
-    wait_ostype 1 "Darwin"
 
     touch "${TEST_PARENTDIR_FILE}"
 
@@ -1444,7 +1440,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     touch "${TEST_PARENTDIR_FILE}"
 
@@ -1463,7 +1458,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     mv "${TEST_PARENTDIR_FILE}" "${TEST_PARENTDIR_FILE_MV}"
 
@@ -1482,7 +1476,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     ln -s "${TEST_PARENTDIR_SYMFILE_BASE}" "${TEST_PARENTDIR_SYMFILE}"
 
@@ -1501,7 +1494,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     touch "${TEST_PARENTDIR_SYMFILE}"
 
@@ -1520,7 +1512,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     mv "${TEST_PARENTDIR_SYMFILE}" "${TEST_PARENTDIR_SYMFILE_MV}"
 
@@ -1539,7 +1530,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     rm "${TEST_PARENTDIR_SYMFILE_MV}"
 
@@ -1558,7 +1548,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     rm "${TEST_PARENTDIR_FILE_MV}"
 
@@ -1577,7 +1566,6 @@ function test_update_parent_directory_time_sub() {
     local base_atime; base_atime=$(get_atime "${TEST_PARENTDIR_PARENT}")
     local base_ctime; base_ctime=$(get_ctime "${TEST_PARENTDIR_PARENT}")
     local base_mtime; base_mtime=$(get_mtime "${TEST_PARENTDIR_PARENT}")
-    wait_ostype 1 "Darwin"
 
     mkdir "${TEST_PARENTDIR_DIR}"
 
@@ -1596,7 +1584,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     touch "${TEST_PARENTDIR_DIR}"
 
@@ -1615,7 +1602,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     mv "${TEST_PARENTDIR_DIR}" "${TEST_PARENTDIR_DIR_MV}"
 
@@ -1634,7 +1620,6 @@ function test_update_parent_directory_time_sub() {
     base_atime="${after_atime}"
     base_ctime="${after_ctime}"
     base_mtime="${after_mtime}"
-    wait_ostype 1 "Darwin"
 
     rm -r "${TEST_PARENTDIR_DIR_MV}"