diff --git a/demo/os/linux/easylogger/plugins/file/elog_file_port.c b/demo/os/linux/easylogger/plugins/file/elog_file_port.c
index cb8fc21..74b92e0 100644
--- a/demo/os/linux/easylogger/plugins/file/elog_file_port.c
+++ b/demo/os/linux/easylogger/plugins/file/elog_file_port.c
@@ -68,28 +68,6 @@ ElogErrCode elog_file_port_init(void) {
     return result;
 }
 
-/**
- *  46  * flush file cache 
- *   47  */
-void inline elog_file_port_flush_cache(Elog_File *file)
-{
-    fflush(file->fp);
-    fsync(file->fd);
-}
-
-/**
- * get file size 
- */
-size_t inline elog_file_port_get_size(Elog_File *file)
-{
-    struct stat statbuf;      
-
-    statbuf.st_size = 0;
-    stat(file->name, &statbuf);  
-
-    return statbuf.st_size;   
-}
-
 /**
  * file log lock
  */
diff --git a/demo/os/linux/easylogger/port/elog_port.c b/demo/os/linux/easylogger/port/elog_port.c
index 1ad3d8b..0721b05 100644
--- a/demo/os/linux/easylogger/port/elog_port.c
+++ b/demo/os/linux/easylogger/port/elog_port.c
@@ -32,7 +32,9 @@
 #include <unistd.h>
 #include <time.h>
 
+#ifdef ELOG_FILE_ENABLE
 #include <file/elog_file.h>
+#endif
 static pthread_mutex_t output_lock;
 
 /**
diff --git a/easylogger/plugins/file/elog_file.c b/easylogger/plugins/file/elog_file.c
index d9ca874..e028e50 100644
--- a/easylogger/plugins/file/elog_file.c
+++ b/easylogger/plugins/file/elog_file.c
@@ -26,6 +26,7 @@
  * Created on: 2019-01-05
  */
 
+#include <unistd.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
@@ -35,10 +36,11 @@
 #include <file/elog_file_cfg.h>
 /* initialize OK flag */
 static bool init_ok = false;
-static Elog_File file;
+static FILE *fp;
+static int fd;
+static Elog_File_Cfg file;
 
-static void elog_file_config_init(Elog_File *file);
-static void elog_file_config_deinit(void);
+static void elog_file_config_init(Elog_File_Cfg *file);
 
 ElogErrCode elog_file_init(void) 
 {
@@ -47,6 +49,13 @@ ElogErrCode elog_file_init(void)
         goto __exit;
 
     elog_file_config_init(&file);
+
+    fp = fopen(file.name, "a+");
+    if (fp)
+        fd = fileno(fp);
+    else
+        fd = -1;
+
     elog_file_port_init();
 
     init_ok = true;
@@ -58,15 +67,21 @@ void elog_file_write(const char *log, size_t size)
 {
     ELOG_ASSERT(init_ok);
     ELOG_ASSERT(log);
+    struct stat statbuf;
 
-    if (unlikely(elog_file_port_get_size(&file) > file.max_size))
+    statbuf.st_size = 0;
+    fstat(fd, &statbuf);
+
+
+    if (unlikely(statbuf.st_size > file.max_size))
         return ;
 
     elog_file_port_lock();
 
-    fwrite(log, size, 1, file.fp);
+    fwrite(log, size, 1, fp);
 #ifdef ELOG_FILE_FLUSH_CAHCE_ENABLE
-    elog_file_port_flush_cache(&file);
+    fflush(fp);
+    fsync(fd);
 #endif 
 
     elog_file_port_unlock();
@@ -76,24 +91,12 @@ void elog_file_deinit(void)
 {
     ELOG_ASSERT(init_ok);
 
-    elog_file_config_deinit();
     elog_file_port_deinit();
+    fclose(fp);
 }
 
-static void elog_file_config_init(Elog_File *file)
+static void elog_file_config_init(Elog_File_Cfg *file)
 {
     file->name = ELOG_FILE_NAME;
     file->max_size = ELOG_FILE_MAX_SIZE;
-    file->fp = fopen(file->name, "a+");
-#ifdef linux
-    if (file->fp)
-        file->fd = fileno(file->fp);
-    else
-        file->fd = -1;
-#endif
-}
-
-static void elog_file_config_deinit(void)
-{
-    fclose(file.fp);
 }
diff --git a/easylogger/plugins/file/elog_file.h b/easylogger/plugins/file/elog_file.h
index 1c5e58c..4ed1b32 100644
--- a/easylogger/plugins/file/elog_file.h
+++ b/easylogger/plugins/file/elog_file.h
@@ -31,24 +31,25 @@
 #include <stdio.h>
 #include <elog.h>
 
-/* EasyLogger file log plugin's software version number */  
-#define ELOG_FILE_SW_VERSION                "V1.0.0"
-#define likely(x) __builtin_expect(!!(x), 1)
-#define unlikely(x) __builtin_expect(!!(x), 0)
-
-typedef struct {
-    FILE *fp;
-#ifdef linux
-    int fd;
-#endif
-    char *name;
-    size_t max_size; 
-} Elog_File;
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
+/* EasyLogger file log plugin's software version number */  
+#define ELOG_FILE_SW_VERSION                "V1.0.0"
+#ifdef linux
+#define likely(x) __builtin_expect(!!(x), 1)
+#define unlikely(x) __builtin_expect(!!(x), 0)
+#else
+#define likely(x)   (x)
+#define unlikely(x) (x)
+#endif
+
+typedef struct {
+    char *name;/* file name */
+    size_t max_size;/* file max size */
+} Elog_File_Cfg;
+
 /* elog_file.c */
 ElogErrCode elog_file_init(void);
 void elog_file_write(const char *log, size_t size);
@@ -56,8 +57,6 @@ void elog_file_deinit(void);
 
 /* elog_file_port.c */
 ElogErrCode elog_file_port_init(void);
-size_t elog_file_port_get_size(Elog_File *file);
-void elog_file_port_flush_cache(Elog_File *file);
 void elog_file_port_lock(void);
 void elog_file_port_unlock(void);
 void elog_file_port_deinit(void);