diff --git a/src/inc/tfs.h b/src/inc/tfs.h
index e0a86fa062a92d456a4b3dcbf4ef8cdf04c4c0ce..cf9988653d372467a9260f2456cceb4aa7c626f3 100644
--- a/src/inc/tfs.h
+++ b/src/inc/tfs.h
@@ -27,38 +27,35 @@ typedef struct {
   int id;
 } SDiskID;
 
-// tfs.c
+// tfs.c ====================================
 int  tfsInit(SDiskCfg *pDiskCfg, int ndisk);
 void tfsDestroy();
 int  tfsUpdateInfo();
-int  tfsCreateDir(char *dirname);
-int  tfsRemoveDir(char *dirname);
-int  tfsRename(char *oldpath, char *newpath);
 
+const char *tfsGetDiskName(int level, int id);
 const char *tfsPrimaryPath();
 
-// tfcntl.c
+// tfcntl.c ====================================
 typedef struct TFSFILE TFSFILE;
-typedef struct TFSDIR  TFSDIR;
-
-TFSDIR *       tfsOpenDir(char *dir);
-void           tfsCloseDir(TFSDIR *tdir);
-const TFSFILE *tfsReadDir(TFSDIR *tdir);
 
 const char *tfsAbsName(TFSFILE *pfile);
 const char *tfsRelName(TFSFILE *pfile);
 void        tfsDirName(TFSFILE *pfile, char dest[]);
 void        tfsBaseName(TFSFILE *pfile, char dest[]);
+int         tfsopen(TFSFILE *pfile, int flags);
+int         tfsclose(int fd);
+TFSFILE *   tfsCreateFiles(int level, int nfile, ...);
+int         tfsRemoveFiles(int nfile, ...);
+SDiskID     tfsFileID(TFSFILE *pfile);
 
-int tfsopen(TFSFILE *pfile, int flags);
-int tfsclose(int fd);
-
-TFSFILE *tfsCreateFiles(int level, int nfile, ...);
-int      tfsRemoveFiles(int nfile, ...);
+typedef struct TFSDIR TFSDIR;
 
-SDiskID tfsFileID(TFSFILE *pfile);
-
-const char *tfsGetDiskName(int level, int id);
+int            tfsCreateDir(char *dirname);
+int            tfsRemoveDir(char *dirname);
+int            tfsRename(char *oldpath, char *newpath);
+TFSDIR *       tfsOpenDir(char *dir);
+void           tfsCloseDir(TFSDIR *tdir);
+const TFSFILE *tfsReadDir(TFSDIR *tdir);
 
 #ifdef __cplusplus
 }
diff --git a/src/tfs/inc/tfsint.h b/src/tfs/inc/tfsint.h
index 1a92868a5d7a455035896c22a4385ba6146cf6fa..0ee1a926411779b0760d21e511ec4733357f7157 100644
--- a/src/tfs/inc/tfsint.h
+++ b/src/tfs/inc/tfsint.h
@@ -43,7 +43,13 @@ int    tfsUpdateDiskInfo(SDisk *pDisk);
 const char *tfsDiskDir(SDisk *pDisk);
 
 // ttier.c
-typedef struct STier STier;
+#define TSDB_MAX_DISK_PER_TIER 16
+
+typedef struct STier {
+  int    level;
+  int    ndisk;
+  SDisk *disks[TSDB_MAX_DISK_PER_TIER];
+} STier;
 
 #define DISK_AT_TIER(pTier, id) ((pTier)->disks[id])
 
diff --git a/src/tfs/src/ttier.c b/src/tfs/src/ttier.c
index d7f45d033136da8b7a5637649bbfb205b7564de7..fbad4c9f3c8eb7806438eec49c583ae080e74db5 100644
--- a/src/tfs/src/ttier.c
+++ b/src/tfs/src/ttier.c
@@ -17,13 +17,6 @@
 #include "tfsint.h"
 #include "taoserror.h"
 
-#define TSDB_MAX_DISK_PER_TIER 16
-struct STier {
-  int    level;
-  int    ndisk;
-  SDisk *disks[TSDB_MAX_DISK_PER_TIER];
-};
-
 // PROTECTED ==========================================
 void tfsInitTier(STier *pTier, int level) {
   pTier->level = level;