diff --git a/src/inc/tfs.h b/src/inc/tfs.h
index 2f816bfa7eeb0820f70fcb36400cdcc8aab5c3f3..a0d666c5fb209470ce2d451a85af74a7258b043a 100644
--- a/src/inc/tfs.h
+++ b/src/inc/tfs.h
@@ -29,14 +29,21 @@ typedef struct {
 
 #define TFS_UNDECIDED_LEVEL -1
 #define TFS_UNDECIDED_ID -1
+#define TFS_PRIMARY_LEVEL 0
+#define TFS_PRIMARY_ID 0
 
-// tfs.c ====================================
+// FS APIs ====================================
 int  tfsInit(SDiskCfg *pDiskCfg, int ndisk);
 void tfsDestroy();
-int  tfsUpdateInfo();
+void tfsUpdateInfo();
 
-const char *tfsGetDiskName(int level, int id);
-const char *tfsPrimaryPath();
+const char *TFS_PRIMARY_PATH();
+const char *TFS_DISK_PATH(int level, int id);
+
+// MANIP APIS ====================================
+int tfsMkdir(const char *rname);
+int tfsRmdir(const char *rname);
+int tfsRename(char *orname, char *nrname);
 
 // tfcntl.c ====================================
 typedef struct TFSFILE {
diff --git a/src/tfs/inc/tfsint.h b/src/tfs/inc/tfsint.h
index 8d59545802fc0f1084d8a246e535f87cb6d186f7..d3377d9fd24dafc1700af7e4697bc2dba1ae2ab7 100644
--- a/src/tfs/inc/tfsint.h
+++ b/src/tfs/inc/tfsint.h
@@ -33,40 +33,56 @@ extern int fsDebugFlag;
 #define fDebug(...) { if (fsDebugFlag & DEBUG_DEBUG) { taosPrintLog("TFS ", cqDebugFlag, __VA_ARGS__); }}
 #define fTrace(...) { if (fsDebugFlag & DEBUG_TRACE) { taosPrintLog("TFS ", cqDebugFlag, __VA_ARGS__); }}
 
-// tdisk.c
-typedef struct SDisk SDisk;
-
-SDisk *tfsNewDisk(int level, int id, char *dir);
-void   tfsFreeDisk(SDisk *pDisk);
-int    tfsUpdateDiskInfo(SDisk *pDisk);
-
-const char *tfsDiskDir(SDisk *pDisk);
-
-// ttier.c
+// tdisk.c ======================================================
+typedef struct {
+  int32_t nfiles;
+  int64_t size;
+  int64_t free;
+} SDiskMeta;
+
+typedef struct SDisk {
+  int       level;
+  int       id;
+  char      dir[TSDB_FILENAME_LEN];
+  SDiskMeta dmeta;
+} SDisk;
+
+#define DISK_LEVEL(pd) ((pd)->level)
+#define DISK_ID(pd) ((pd)->id)
+#define DISK_DIR(pd) ((pd)->dir)
+#define DISK_META(pd) ((pd)->dmeta)
+#define DISK_SIZE(pd) ((pd)->dmeta.size)
+#define DISK_FREE_SIZE(pd) ((pd)->dmeta.free)
+#define DISK_NFILES(pd) ((pd)->dmeta.nfiles)
+
+SDisk *tfsNewDisk(int level, int id, const char *dir);
+SDisk *tfsFreeDisk(SDisk *pDisk);
+void   tfsUpdateDiskInfo(SDisk *pDisk);
+
+// ttier.c ======================================================
 #define TSDB_MAX_DISK_PER_TIER 16
 
+typedef struct {
+  int64_t size;
+  int64_t free;
+} STierMeta;
 typedef struct STier {
-  int    level;
-  int    ndisk;
-  SDisk *disks[TSDB_MAX_DISK_PER_TIER];
+  int       level;
+  int32_t   ndisk;
+  STierMeta tmeta;
+  SDisk *   disks[TSDB_MAX_DISK_PER_TIER];
 } STier;
 
-#define DISK_AT_TIER(pTier, id) ((pTier)->disks[id])
+#define TIER_LEVEL(pt) ((pt)->level)
+#define TIER_NDISKS(pt) ((pt)->ndisk)
+#define TIER_SIZE(pt) ((pt)->tmeta.size)
+#define TIER_FREE_SIZE(pt) ((pt)->tmeta.free)
+#define DISK_AT_TIER(pt, id) ((pt)->disks[id])
 
 void   tfsInitTier(STier *pTier, int level);
 void   tfsDestroyTier(STier *pTier);
 SDisk *tfsMountDiskToTier(STier *pTier, SDiskCfg *pCfg);
-int    tfsUpdateTierInfo(STier *pTier);
-
-// tfs.c
-void tfsIncFileAt(int level, int id);
-void tfsDecFileAt(int level, int id);
-int  tfsLock();
-int  tfsUnLock();
-bool tfsIsLocked();
-int  tfsLevels();
-
-// tfcntl.c
+void   tfsUpdateTierInfo(STier *pTier);
 
 #ifdef __cplusplus
 }
diff --git a/src/tfs/src/tdisk.c b/src/tfs/src/tdisk.c
index b73f33caabae495dbcd7d9f8b9920f261a0b48fa..8403eaa4cad049dcd7089b778301352ea70b641d 100644
--- a/src/tfs/src/tdisk.c
+++ b/src/tfs/src/tdisk.c
@@ -17,21 +17,8 @@
 #include "taoserror.h"
 #include "tfsint.h"
 
-typedef struct {
-  uint64_t size;
-  uint64_t free;
-  uint64_t nfiles;
-} SDiskMeta;
-
-struct SDisk {
-  int       level;
-  int       id;
-  char      dir[TSDB_FILENAME_LEN];
-  SDiskMeta dmeta;
-};
-
 // PROTECTED ====================================
-SDisk *tfsNewDisk(int level, int id, char *dir) {
+SDisk *tfsNewDisk(int level, int id, const char *dir) {
   SDisk *pDisk = (SDisk *)calloc(1, sizeof(*pDisk));
   if (pDisk == NULL) {
     terrno = TSDB_CODE_FS_OUT_OF_MEMORY;
@@ -45,24 +32,24 @@ SDisk *tfsNewDisk(int level, int id, char *dir) {
   return pDisk;
 }
 
-void tfsFreeDisk(SDisk *pDisk) {
+SDisk *tfsFreeDisk(SDisk *pDisk) {
   if (pDisk) {
     free(pDisk);
   }
+  return NULL;
 }
 
-int tfsUpdateDiskInfo(SDisk *pDisk) {
+void tfsUpdateDiskInfo(SDisk *pDisk) {
+  ASSERT(pDisk != NULL);
   SysDiskSize dstat;
   if (taosGetDiskSize(pDisk->dir, &dstat) < 0) {
-    fError("failed to get dir %s information since %s", pDisk->dir, strerror(errno));
+    fError("failed to update disk information at level %d id %d dir %s since %s", pDisk->level, pDisk->id, pDisk->dir,
+           strerror(errno));
     terrno = TAOS_SYSTEM_ERROR(errno);
-    return -1;
+    pDisk->dmeta.size = 0;
+    pDisk->dmeta.free = 0;
+  } else {
+    pDisk->dmeta.size = dstat.tsize;
+    pDisk->dmeta.free = dstat.avail;
   }
-
-  pDisk->dmeta.size = dstat.tsize;
-  pDisk->dmeta.free = dstat.avail;
-
-  return 0;
-}
-
-const char *tfsDiskDir(SDisk *pDisk) { return pDisk->dir; }
\ No newline at end of file
+}
\ No newline at end of file
diff --git a/src/tfs/src/tfs.c b/src/tfs/src/tfs.c
index 44c2045679f325f2a6ec0fe84038ebb38d3bac51..fc091f7b23dbcb5d500ae390b28ad1f808e00979 100644
--- a/src/tfs/src/tfs.c
+++ b/src/tfs/src/tfs.c
@@ -17,13 +17,14 @@
 
 #include "hash.h"
 #include "taoserror.h"
+#include "tfs.h"
 #include "tfsint.h"
 
 #define TSDB_MAX_TIER 3
 
 typedef struct {
-  uint64_t tsize;
-  uint64_t avail;
+  int64_t tsize;
+  int64_t avail;
 } SFSMeta;
 
 typedef struct {
@@ -35,24 +36,34 @@ typedef struct {
   SHashObj *      map;  // name to did map
 } SFS;
 
-static SFS  tdFileSystem = {0};
-static SFS *pfs = &tdFileSystem;
-
-#define TIER_AT(level) (pfs->tiers + (level))
-#define DISK_AT(level, id) DISK_AT_TIER(TIER_AT(level), id)
-
-static int tfsMount(SDiskCfg *pCfg);
-static int tfsCheckAndFormatCfg(SDiskCfg *pCfg);
-static int tfsFormatDir(char *idir, char *odir);
-static int tfsCheck();
-static tfsGetDiskByName(char *dirName);
-
-// public:
+#define TFS_LOCKED() (pfs->locked)
+#define TFS_META() (pfs->meta)
+#define TFS_NLEVEL() (pfs->nlevel)
+#define TFS_TIERS() (pfs->tiers)
+
+#define TFS_TIER_AT(level) (TFS_TIERS() + (level))
+#define TFS_DISK_AT(level, id) DISK_AT_TIER(TFS_TIER_AT(level), id)
+#define TFS_PRIMARY_DISK() TFS_DISK_AT(TFS_PRIMARY_LEVEL, TFS_PRIMARY_ID)
+
+static SFS  tfs = {0};
+static SFS *pfs = &tfs;
+
+// STATIC DECLARATION
+static int    tfsMount(SDiskCfg *pCfg);
+static int    tfsCheck();
+static int    tfsCheckAndFormatCfg(SDiskCfg *pCfg);
+static int    tfsFormatDir(char *idir, char *odir);
+static SDisk *tfsGetDiskByID(SDiskID did);
+static SDisk *tfsGetDiskByName(const char *dir);
+static int    tfsLock();
+static int    tfsUnLock();
+
+// FS APIs
 int tfsInit(SDiskCfg *pDiskCfg, int ndisk) {
   ASSERT(ndisk > 0);
 
   for (int level = 0; level < TSDB_MAX_TIER; level++) {
-    tdInitTier(TIER_AT(level), level);
+    tfsInitTier(TFS_TIER_AT(level), level);
   }
 
   int ret = pthread_mutex_init(&(pfs->lock), NULL);
@@ -81,6 +92,8 @@ int tfsInit(SDiskCfg *pDiskCfg, int ndisk) {
     return -1;
   }
 
+  tfsUpdateInfo();
+
   return 0;
 }
 
@@ -89,39 +102,39 @@ void tfsDestroy() {
   pfs->map = NULL;
   
   pthread_mutex_destroy(&(pfs->lock));
-  for (int level = 0; level < TSDB_MAX_TIER; level++) {
-    tfsDestroyTier(TIER_AT(level));
+  for (int level = 0; level < TFS_NLEVEL(); level++) {
+    tfsDestroyTier(TFS_TIER_AT(level));
   }
 }
 
-int tfsUpdateInfo() {
+void tfsUpdateInfo() {
   tfsLock();
 
-  for (int level = 0; level < pfs->nlevel; level++) {
-    if (tfsUpdateTierInfo(TIER_AT(level)) < 0) {
-      // TODO: deal with the error here
-    }
+  for (int level = 0; level < TFS_NLEVEL(); level++) {
+    STier *pTier = TFS_TIER_AT(level);
+    tfsUpdateTierInfo(pTier);
+    pfs->meta.tsize = TIER_SIZE(pTier);
+    pfs->meta.avail = TIER_FREE_SIZE(pTier);
   }
 
   tfsUnLock();
 }
 
-const char *tfsPrimaryPath() { return tfsDiskDir(DISK_AT(0, 0)); }
+const char *TFS_PRIMARY_PATH() { return DISK_DIR(TFS_PRIMARY_DISK()); }
+const char *TFS_DISK_PATH(int level, int id) { return DISK_DIR(TFS_DISK_AT(level, id)); }
 
-int tfsCreateDir(char *dirname) {
-  char dirName[TSDB_FILENAME_LEN] = "\0";
+// MANIP APIS ====================================
+int tfsMkdir(const char *rname) {
+  char aname[TSDB_FILENAME_LEN] = "\0";
 
-  for (int level = 0; level < pfs->nlevel; level++) {
-    STier *pTier = TIER_AT(level);
-    for (int id = 0; id < pTier->ndisk; id++) {
+  for (int level = 0; level < TFS_NLEVEL(); level++) {
+    STier *pTier = TFS_TIER_AT(level);
+    for (int id = 0; id < TIER_NDISKS(pTier); id++) {
       SDisk *pDisk = DISK_AT_TIER(pTier, id);
+      snprintf(aname, TSDB_FILENAME_LEN, "%s/%s", DISK_DIR(pDisk), rname);
 
-      ASSERT(pDisk != NULL);
-
-      snprintf(dirName, TSDB_FILENAME_LEN, "%s/%s", pDisk->name, dirname);
-
-      if (mkdir(dirName, 0755) != 0 && errno != EEXIST) {
-        fError("failed to create directory %s since %s", dirName, strerror(errno));
+      if (mkdir(aname, 0755) != 0 && errno != EEXIST) {
+        fError("failed to create directory %s since %s", aname, strerror(errno));
         terrno = TAOS_SYSTEM_ERROR(errno);
         return -1;
       }
@@ -131,60 +144,43 @@ int tfsCreateDir(char *dirname) {
   return 0;
 }
 
-int tfsRemoveDir(char *dirname) {
-  char dirName[TSDB_FILENAME_LEN] = "\0";
+int tfsRmdir(const char *rname) {
+  char aname[TSDB_FILENAME_LEN] = "\0";
 
-  for (int level = 0; level < pfs->nlevel; level++) {
-    STier *pTier = TIER_AT(level);
-    for (int id = 0; id < pTier->ndisk; id++) {
+  for (int level = 0; level < TFS_NLEVEL(); level++) {
+    STier *pTier = TFS_TIER_AT(level);
+    for (int id = 0; id < TIER_NDISKS(pTier); id++) {
       SDisk *pDisk = DISK_AT_TIER(pTier, id);
 
-      ASSERT(pDisk != NULL);
+      snprintf(aname, TSDB_FILENAME_LEN, "%s/%s", DISK_DIR(pDisk), rname);
 
-      snprintf(dirName, TSDB_FILENAME_LEN, "%s/%s", pDisk->dir, dirname);
-
-      taosRemoveDir(dirName);
+      taosRemoveDir(aname);
     }
   }
 
   return 0;
 }
 
-int tfsRename(char *oldpath, char *newpath) {
-  char oldName[TSDB_FILENAME_LEN] = "\0";
-  char newName[TSDB_FILENAME_LEN] = "\0";
+int tfsRename(char *orname, char *nrname) {
+  char oaname[TSDB_FILENAME_LEN] = "\0";
+  char naname[TSDB_FILENAME_LEN] = "\0";
 
   for (int level = 0; level < pfs->nlevel; level++) {
-    STier *pTier = TIER_AT(level);
-    for (int id = 0; id < pTier->ndisk; id++) {
+    STier *pTier = TFS_TIER_AT(level);
+    for (int id = 0; id < TIER_NDISKS(pTier); id++) {
       SDisk *pDisk = DISK_AT_TIER(pTier, id);
 
-      ASSERT(pDisk != NULL);
-
-      snprintf(oldName, TSDB_FILENAME_LEN, "%s/%s", pDisk->dir, oldpath);
-      snprintf(newName, TSDB_FILENAME_LEN, "%s/%s", pDisk->dir, newpath);
+      snprintf(oaname, TSDB_FILENAME_LEN, "%s/%s", DISK_DIR(pDisk), orname);
+      snprintf(naname, TSDB_FILENAME_LEN, "%s/%s", DISK_DIR(pDisk), nrname);
 
-      taosRename(oldName, newName);
+      taosRename(oaname, naname);
     }
   }
 
   return 0;
 }
 
-// protected:
-void tfsIncFileAt(int level, int id) {
-  ASSERT(tfsIsLocked());
-  DISK_AT(level, id)->dmeta.nfiles++;
-  ASSERT(DISK_AT(level, id)->dmeta.nfiles > 0);
-}
-
-void tfsDecFileAt(int level, int id) {
-  ASSERT(tfsIsLocked());
-  DISK_AT(level, id)->dmeta.nfiles--;
-  ASSERT(DISK_AT(level, id)->dmeta.nfiles >= 0);
-}
-
-int tfsLock() {
+static int tfsLock() {
   int code = pthread_mutex_lock(&(pfs->lock));
   if (code != 0) {
     terrno = TAOS_SYSTEM_ERROR(code);
@@ -196,7 +192,7 @@ int tfsLock() {
   return 0;
 }
 
-int tfsUnLock() {
+static int tfsUnLock() {
   pfs->locked = false;
 
   int code = pthread_mutex_unlock(&(pfs->lock));
@@ -208,32 +204,24 @@ int tfsUnLock() {
   return 0;
 }
 
-bool tfsIsLocked() { return pfs->locked; }
-
-int tfsLevels() { return pfs->nlevel; }
-
-const char *tfsGetDiskName(int level, int id) {
-  return DISK_AT(level, id)->dir;
-}
-
 // private
 static int tfsMount(SDiskCfg *pCfg) {
   SDiskID did;
+  SDisk * pDisk = NULL;
 
   if (tfsCheckAndFormatCfg(pCfg) < 0) return -1;
 
   did.level = pCfg->level;
-  did.id = tdMountToTier(TIER_AT(pCfg->level), pCfg);
-  if (did.id < 0) {
-    fError("failed to mount %s to FS since %s", pCfg->dir, tstrerror(terrno));
+  pDisk = tfsMountDiskToTier(TFS_TIER_AT(did.level), pCfg);
+  if (pDisk == NULL) {
+    fError("failed to mount disk %s to level %d since %s", pCfg->dir, pCfg->level, strerror(terrno));
     return -1;
   }
+  did.id = DISK_ID(pDisk);
 
-  taosHashPut(pTiers->map, pCfg->dir, strnlen(pCfg->dir, TSDB_FILENAME_LEN), (void *)(&did), sizeof(did));
+  taosHashPut(pfs->map, (void *)(pCfg->dir), strnlen(pCfg->dir, TSDB_FILENAME_LEN), (void *)(&did), sizeof(did));
   if (pfs->nlevel < pCfg->level + 1) pfs->nlevel = pCfg->level + 1;
 
-  // TODO: update meta info
-
   return 0;
 }
 
@@ -254,8 +242,8 @@ static int tfsCheckAndFormatCfg(SDiskCfg *pCfg) {
       return -1;
     }
 
-    if (DISK_AT(0, 0) != NULL) {
-      fError("failed to mount %s to FS since duplicate primary mount", pCfg->dir, pCfg->level);
+    if (TFS_PRIMARY_DISK() != NULL) {
+      fError("failed to mount %s to FS since duplicate primary mount", pCfg->dir);
       terrno = TSDB_CODE_FS_DUP_PRIMARY;
       return -1;
     }
@@ -317,25 +305,35 @@ static int tfsFormatDir(char *idir, char *odir) {
 }
 
 static int tfsCheck() {
-  if (DISK_AT(0, 0) == NULL) {
+  if (TFS_PRIMARY_DISK() == NULL) {
     fError("no primary disk is set");
     terrno = TSDB_CODE_FS_NO_PRIMARY_DISK;
     return -1;
   }
 
-  int level = 0;
-  do {
-    if (TIER_AT(level)->ndisk == 0) {
+  for (int level = 0; level < TFS_NLEVEL(); level++) {
+    if (TIER_NDISKS(TFS_TIER_AT(level)) == 0) {
       fError("no disk at level %d", level);
       terrno = TSDB_CODE_FS_NO_MOUNT_AT_TIER;
       return -1;
     }
-  } while (level < pfs->nlevel);
+  }
 
   return 0;
 }
 
-static tfsGetDiskByName(char *dirName) {
-}
+static SDisk *tfsGetDiskByID(SDiskID did) { return TFS_DISK_AT(did.level, did.id); }
+static SDisk *tfsGetDiskByName(const char *dir) {
+  SDiskID did;
+  SDisk * pDisk = NULL;
+  void *  pr = NULL;
+
+  pr = taosHashGet(pfs->map, (void *)dir, strnlen(dir, TSDB_FILENAME_LEN));
+  if (pr == NULL) return NULL;
+
+  did = *(SDiskID *)pr;
+  pDisk = tfsGetDiskByID(did);
+  ASSERT(pDisk != NULL);
 
-static SDisk *tfsGetDiskByID(SDiskID did) { return DISK_AT(did.level, did.id); }
\ No newline at end of file
+  return pDisk;
+}
\ No newline at end of file
diff --git a/src/tfs/src/ttier.c b/src/tfs/src/ttier.c
index fbad4c9f3c8eb7806438eec49c583ae080e74db5..28c45d28e7b9025c111a548f7419ba9e21f63c17 100644
--- a/src/tfs/src/ttier.c
+++ b/src/tfs/src/ttier.c
@@ -18,14 +18,11 @@
 #include "taoserror.h"
 
 // PROTECTED ==========================================
-void tfsInitTier(STier *pTier, int level) {
-  pTier->level = level;
-}
+void tfsInitTier(STier *pTier, int level) { pTier->level = level; }
 
 void tfsDestroyTier(STier *pTier) {
   for (int id = 0; id < TSDB_MAX_DISK_PER_TIER; id++) {
-    tfsFreeDisk(DISK_AT_TIER(pTier, id));
-    pTier->disks[id] = NULL;
+    DISK_AT_TIER(pTier, id) = tfsFreeDisk(DISK_AT_TIER(pTier, id));
   }
   pTier->ndisk = 0;
 }
@@ -34,9 +31,9 @@ SDisk *tfsMountDiskToTier(STier *pTier, SDiskCfg *pCfg) {
   ASSERT(pTier->level == pCfg->level);
   int id = 0;
 
-  if (pTier->ndisk >= TSDB_MAX_DISK_PER_TIER) {
+  if (TIER_NDISKS(pTier) >= TSDB_MAX_DISK_PER_TIER) {
     terrno = TSDB_CODE_FS_TOO_MANY_MOUNT;
-    return -1;
+    return NULL;
   }
 
   if (pTier->level == 0) {
@@ -46,7 +43,7 @@ SDisk *tfsMountDiskToTier(STier *pTier, SDiskCfg *pCfg) {
       id = pTier->ndisk + 1;
       if (id >= TSDB_MAX_DISK_PER_TIER) {
         terrno = TSDB_CODE_FS_TOO_MANY_MOUNT;
-        return -1;
+        return NULL;
       }
     }
   } else {
@@ -54,19 +51,22 @@ SDisk *tfsMountDiskToTier(STier *pTier, SDiskCfg *pCfg) {
   }
 
   DISK_AT_TIER(pTier, id) = tfsNewDisk(pCfg->level, id, pCfg->dir);
-  if (DISK_AT_TIER(pTier, id) == NULL) return -1;
+  if (DISK_AT_TIER(pTier, id) == NULL) return NULL;
   pTier->ndisk++;
 
-  fDebug("disk %s is mounted to level %d id %d", pCfg->dir, pCfg->level, id);
+  fDebug("disk %s is mounted to tier level %d id %d", pCfg->dir, pCfg->level, id);
 
-  return id;
+  return DISK_AT_TIER(pTier, id);
 }
 
-int tfsUpdateTierInfo(STier *pTier) {
+void tfsUpdateTierInfo(STier *pTier) {
+  STierMeta tmeta = {0};
+
   for (int id = 0; id < pTier->ndisk; id++) {
-    if (tfsUpdateDiskInfo(DISK_AT_TIER(pTier, id)) < 0) {
-      return -1;
-    }
+    tfsUpdateDiskInfo(DISK_AT_TIER(pTier, id));
+    tmeta.size += DISK_SIZE(DISK_AT_TIER(pTier, id));
+    tmeta.free += DISK_FREE_SIZE(DISK_AT_TIER(pTier, id));
   }
-  return 0;
+
+  pTier->tmeta = tmeta;
 }
\ No newline at end of file