diff --git a/src/dnode/src/dnodeMain.c b/src/dnode/src/dnodeMain.c
index 130be0af202a4882a100335713ba0f81af7a3c11..9f52dbd331b02b19348d43309c693f3637765cdd 100644
--- a/src/dnode/src/dnodeMain.c
+++ b/src/dnode/src/dnodeMain.c
@@ -19,6 +19,7 @@
 #include "tutil.h"
 #include "tconfig.h"
 #include "tglobal.h"
+#include "tfile.h"
 #include "twal.h"
 #include "trpc.h"
 #include "dnode.h"
@@ -55,6 +56,7 @@ typedef struct {
 } SDnodeComponent;
 
 static const SDnodeComponent tsDnodeComponents[] = {
+  {"tfile",     tfInit,              tfCleanup},
   {"rpc",       rpcInit,             rpcCleanup},
   {"storage",   dnodeInitStorage,    dnodeCleanupStorage},
   {"dnodecfg",  dnodeInitCfg,        dnodeCleanupCfg},
diff --git a/src/inc/twal.h b/src/inc/twal.h
index 8dd3a8a91209e840abeb9560f94a52ce362492a9..1645de77aacf020048dc21cd47907163089f269f 100644
--- a/src/inc/twal.h
+++ b/src/inc/twal.h
@@ -51,9 +51,8 @@ typedef struct {
 typedef void *  twalh;  // WAL HANDLE
 typedef int32_t FWalWrite(void *ahandle, void *pHead, int32_t qtype, void *pMsg);
 
-int32_t walInit();
-void    walCleanUp();
-
+int32_t  walInit();
+void     walCleanUp();
 twalh    walOpen(char *path, SWalCfg *pCfg);
 int32_t  walAlter(twalh pWal, SWalCfg *pCfg);
 void     walStop(twalh);
diff --git a/src/os/inc/osFile.h b/src/os/inc/osFile.h
index 62e44d8eb0b70fb1526693895847637daa72247a..c9b3b9cd76d675169746a2478bfbd775d6da190a 100644
--- a/src/os/inc/osFile.h
+++ b/src/os/inc/osFile.h
@@ -20,17 +20,6 @@
 extern "C" {
 #endif
 
-#define tread(fd, buf, count) read(fd, buf, count)
-#define twrite(fd, buf, count) write(fd, buf, count)
-#define tlseek(fd, offset, whence) lseek(fd, offset, whence)
-#define tclose(fd)    \
-  {                       \
-    if (FD_VALID(fd)) {    \
-      close(fd);           \
-      fd = FD_INITIALIZER; \
-    }                     \
-  }
-
 int64_t taosReadImp(int32_t fd, void *buf, int64_t count);
 int64_t taosWriteImp(int32_t fd, void *buf, int64_t count);
 int64_t taosLSeekImp(int32_t fd, int64_t offset, int32_t whence);
@@ -39,7 +28,13 @@ int32_t taosRenameFile(char *fullPath, char *suffix, char delimiter, char **dstP
 #define taosRead(fd, buf, count) taosReadImp(fd, buf, count)
 #define taosWrite(fd, buf, count) taosWriteImp(fd, buf, count)
 #define taosLSeek(fd, offset, whence) taosLSeekImp(fd, offset, whence)
-#define taosClose(x) tclose(x)
+#define taosClose(fd)      \
+  {                        \
+    if (FD_VALID(fd)) {    \
+      close(fd);           \
+      fd = FD_INITIALIZER; \
+    }                      \
+  }
 
 // TAOS_OS_FUNC_FILE_SENDIFLE
 int64_t taosSendFile(int32_t dfd, int32_t sfd, int64_t *offset, int64_t size);
diff --git a/src/os/src/detail/osFile.c b/src/os/src/detail/osFile.c
index 23fc88b8e1f5d4c0e2fe6b2140278b1e32d35abb..2e6886aa21f8c083e1134122ac334a20edf54874 100644
--- a/src/os/src/detail/osFile.c
+++ b/src/os/src/detail/osFile.c
@@ -116,7 +116,7 @@ int64_t taosWriteImp(int32_t fd, void *buf, int64_t n) {
 }
 
 int64_t taosLSeekImp(int32_t fd, int64_t offset, int32_t whence) {
-  return (int64_t)tlseek(fd, (long)offset, whence);
+  return (int64_t)lseek(fd, (long)offset, whence);
 }
 
 #ifndef TAOS_OS_FUNC_FILE_SENDIFLE
diff --git a/src/util/inc/tfile.h b/src/util/inc/tfile.h
index 10b7c1df35caaa675c9334106785b91af3fdeb05..066040170e44c24539e29b5de5acd438e8b9b9d0 100644
--- a/src/util/inc/tfile.h
+++ b/src/util/inc/tfile.h
@@ -20,23 +20,26 @@
 extern "C" {
 #endif
 
-#include <unistd.h>
-
 // init taos file module
-int32_t tfinit();
+int32_t tfInit();
 
 // clean up taos file module
-void tfcleanup();
+void tfCleanup();
 
 // the same syntax as UNIX standard open/close/read/write
 // but FD is int64_t and will never be reused
-int64_t tfopen(const char *pathname, int32_t flags);
-int64_t tfclose(int64_t tfd);
-int64_t tfwrite(int64_t tfd, void *buf, int64_t count);
-int64_t tfread(int64_t tfd, void *buf, int64_t count);
+int64_t tfOpen(const char *pathname, int32_t flags);
+int64_t tfOpenM(const char *pathname, int32_t flags, mode_t mode);
+int64_t tfClose(int64_t tfd);
+int64_t tfWrite(int64_t tfd, void *buf, int64_t count);
+int64_t tfRead(int64_t tfd, void *buf, int64_t count);
+int32_t tfFsync(int64_t tfd);
+bool    tfValid(int64_t tfd);
+int64_t tfLseek(int64_t tfd, int64_t offset, int32_t whence);
+int32_t tfFtruncate(int64_t tfd, int64_t length);
 
 #ifdef __cplusplus
 }
 #endif
 
-#endif  // TDENGINE_TREF_H
+#endif  // TDENGINE_TFILE_H
diff --git a/src/util/src/tfile.c b/src/util/src/tfile.c
index 27ba30fe8179ecd5e213d4cf78862fd4982b3ba4..1fa6a3d096841f6b9405704bbaa0e302f536f2ce 100644
--- a/src/util/src/tfile.c
+++ b/src/util/src/tfile.c
@@ -13,6 +13,7 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
+#define _DEFAULT_SOURCE
 #include "os.h"
 #include "taoserror.h"
 #include "tulog.h"
@@ -21,40 +22,52 @@
 
 static int32_t tsFileRsetId = -1;
 
-static void taosCloseFile(void *p) {
+static void tfCloseFile(void *p) {
   close((int32_t)(uintptr_t)p);
 }
 
-int32_t tfinit() {
-  tsFileRsetId = taosOpenRef(2000, taosCloseFile);
-  return tsFileRsetId;
+int32_t tfInit() {
+  tsFileRsetId = taosOpenRef(2000, tfCloseFile);
+  if (tsFileRsetId > 0) {
+    return 0;
+  } else {
+    return -1;
+  }
 }
 
-void tfcleanup() {
+void tfCleanup() {
   if (tsFileRsetId >= 0) taosCloseRef(tsFileRsetId);
   tsFileRsetId = -1;
 }
 
-int64_t tfopen(const char *pathname, int32_t flags) {
-  int32_t fd = open(pathname, flags);
-
+static int64_t tfOpenImp(int32_t fd) {
   if (fd < 0) {
     terrno = TAOS_SYSTEM_ERROR(errno);
     return -1;
-  } 
+  }
 
-  void *p = (void *)(int64_t)fd;
+  void *  p = (void *)(int64_t)fd;
   int64_t rid = taosAddRef(tsFileRsetId, p);
   if (rid < 0) close(fd);
 
   return rid;
 }
 
-int64_t tfclose(int64_t tfd) {
+int64_t tfOpen(const char *pathname, int32_t flags) {
+  int32_t fd = open(pathname, flags);
+  return tfOpenImp(fd);
+}
+
+int64_t tfOpenM(const char *pathname, int32_t flags, mode_t mode) {
+  int32_t fd = open(pathname, flags, mode);
+  return tfOpenImp(fd);
+}
+
+int64_t tfClose(int64_t tfd) {
   return taosRemoveRef(tsFileRsetId, tfd);
 }
 
-int64_t tfwrite(int64_t tfd, void *buf, int64_t count) {
+int64_t tfWrite(int64_t tfd, void *buf, int64_t count) {
   void *p = taosAcquireRef(tsFileRsetId, tfd);
   if (p == NULL) return -1;
 
@@ -67,7 +80,7 @@ int64_t tfwrite(int64_t tfd, void *buf, int64_t count) {
   return ret;
 }
 
-int64_t tfread(int64_t tfd, void *buf, int64_t count) {
+int64_t tfRead(int64_t tfd, void *buf, int64_t count) {
   void *p = taosAcquireRef(tsFileRsetId, tfd);
   if (p == NULL) return -1;
 
@@ -79,3 +92,32 @@ int64_t tfread(int64_t tfd, void *buf, int64_t count) {
   taosReleaseRef(tsFileRsetId, tfd);
   return ret;
 }
+
+int64_t tfFsync(int64_t tfd) {
+  void *p = taosAcquireRef(tsFileRsetId, tfd);
+  if (p == NULL) return -1;
+
+  int32_t fd = (int32_t)(uintptr_t)p;
+  return fsync(fd);
+}
+
+bool tfValid(int64_t tfd) {
+  void *p = taosAcquireRef(tsFileRsetId, tfd);
+  return p != NULL;
+}
+
+int64_t tfLseek(int64_t tfd, int64_t offset, int32_t whence) {
+  void *p = taosAcquireRef(tsFileRsetId, tfd);
+  if (p == NULL) return -1;
+
+  int32_t fd = (int32_t)(uintptr_t)p;
+  return taosLSeek(fd, offset, whence);
+}
+
+int32_t tfFtruncate(int64_t tfd, int64_t length) {
+  void *p = taosAcquireRef(tsFileRsetId, tfd);
+  if (p == NULL) return -1;
+
+  int32_t fd = (int32_t)(uintptr_t)p;
+  return taosFtruncate(fd, length);
+}
diff --git a/src/wal/inc/walInt.h b/src/wal/inc/walInt.h
index b0edabfbd8b0f9e0c71d478994c796f4de755c0a..06748d885f7b0fb798abc1873a1734abbf9f05ab 100644
--- a/src/wal/inc/walInt.h
+++ b/src/wal/inc/walInt.h
@@ -44,8 +44,8 @@ typedef struct {
   uint64_t version;
   int64_t  fileId;
   int64_t  rid;
+  int64_t  tfd;
   int32_t  vgId;
-  int32_t  fd;
   int32_t  keep;
   int32_t  level;
   int32_t  fsyncPeriod;
diff --git a/src/wal/src/walMgmt.c b/src/wal/src/walMgmt.c
index 36c190be3e0f72f96b9075b7fb90db39ee3c5412..72ea239817778db036e1eb05fc67fdcd128cbb6b 100644
--- a/src/wal/src/walMgmt.c
+++ b/src/wal/src/walMgmt.c
@@ -17,6 +17,7 @@
 #include "os.h"
 #include "taoserror.h"
 #include "tref.h"
+#include "tfile.h"
 #include "twal.h"
 #include "walInt.h"
 
@@ -61,7 +62,7 @@ void *walOpen(char *path, SWalCfg *pCfg) {
   }
 
   pWal->vgId = pCfg->vgId;
-  pWal->fd = -1;
+  pWal->tfd = -1;
   pWal->fileId = -1;
   pWal->level = pCfg->walLevel;
   pWal->keep = pCfg->keep;
@@ -124,7 +125,7 @@ void walClose(void *handle) {
 
   SWal *pWal = handle;
   pthread_mutex_lock(&pWal->mutex);
-  taosClose(pWal->fd);
+  tfClose(pWal->tfd);
   pthread_mutex_unlock(&pWal->mutex);
   taosRemoveRef(tsWal.refId, pWal->rid);
 }
@@ -143,7 +144,7 @@ static void walFreeObj(void *wal) {
   SWal *pWal = wal;
   wDebug("vgId:%d, wal:%p is freed", pWal->vgId, pWal);
 
-  taosClose(pWal->fd);
+  tfClose(pWal->tfd);
   pthread_mutex_destroy(&pWal->mutex);
   tfree(pWal);
 }
@@ -172,7 +173,7 @@ static void walFsyncAll() {
   while (pWal) {
     if (walNeedFsync(pWal)) {
       wTrace("vgId:%d, do fsync, level:%d seq:%d rseq:%d", pWal->vgId, pWal->level, pWal->fsyncSeq, tsWal.seq);
-      int32_t code = fsync(pWal->fd);
+      int32_t code = tfFsync(pWal->tfd);
       if (code != 0) {
         wError("vgId:%d, file:%s, failed to fsync since %s", pWal->vgId, pWal->name, strerror(code));
       }
diff --git a/src/wal/src/walWrite.c b/src/wal/src/walWrite.c
index 8a532c81646957d1f7785fc4404a2508c21db197..10e1b4dd614fb881ea8819a16ca2451b20f4393d 100644
--- a/src/wal/src/walWrite.c
+++ b/src/wal/src/walWrite.c
@@ -18,6 +18,7 @@
 #include "os.h"
 #include "taoserror.h"
 #include "tchecksum.h"
+#include "tfile.h"
 #include "twal.h"
 #include "walInt.h"
 
@@ -36,8 +37,8 @@ int32_t walRenew(void *handle) {
 
   pthread_mutex_lock(&pWal->mutex);
 
-  if (pWal->fd >= 0) {
-    tclose(pWal->fd);
+  if (tfValid(pWal->tfd)) {
+    tfClose(pWal->tfd);
     wDebug("vgId:%d, file:%s, it is closed", pWal->vgId, pWal->name);
   }
 
@@ -49,9 +50,9 @@ int32_t walRenew(void *handle) {
   }
 
   snprintf(pWal->name, sizeof(pWal->name), "%s/%s%" PRId64, pWal->path, WAL_PREFIX, pWal->fileId);
-  pWal->fd = open(pWal->name, O_WRONLY | O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO);
+  pWal->tfd = tfOpenM(pWal->name, O_WRONLY | O_CREAT, S_IRWXU | S_IRWXG | S_IRWXO);
 
-  if (pWal->fd < 0) {
+  if (!tfValid(pWal->tfd)) {
     code = TAOS_SYSTEM_ERROR(errno);
     wError("vgId:%d, file:%s, failed to open since %s", pWal->vgId, pWal->name, strerror(errno));
   } else {
@@ -67,7 +68,7 @@ void walRemoveOneOldFile(void *handle) {
   SWal *pWal = handle;
   if (pWal == NULL) return;
   if (pWal->keep == TAOS_WAL_KEEP) return;
-  if (pWal->fd <= 0) return;
+  if (!tfValid(pWal->tfd)) return;
 
   pthread_mutex_lock(&pWal->mutex);
 
@@ -113,7 +114,7 @@ int32_t walWrite(void *handle, SWalHead *pHead) {
   int32_t code = 0;
 
   // no wal
-  if (pWal->fd <= 0) return 0;
+  if (!tfValid(pWal->tfd)) return 0;
   if (pWal->level == TAOS_WAL_NOLOG) return 0;
   if (pHead->version <= pWal->version) return 0;
 
@@ -123,12 +124,12 @@ int32_t walWrite(void *handle, SWalHead *pHead) {
 
   pthread_mutex_lock(&pWal->mutex);
 
-  if (taosWrite(pWal->fd, pHead, contLen) != contLen) {
+  if (tfWrite(pWal->tfd, pHead, contLen) != contLen) {
     code = TAOS_SYSTEM_ERROR(errno);
     wError("vgId:%d, file:%s, failed to write since %s", pWal->vgId, pWal->name, strerror(errno));
   } else {
-    wTrace("vgId:%d, write wal, fileId:%" PRId64 " fd:%d hver:%" PRId64 " wver:%" PRIu64 " len:%d", pWal->vgId,
-           pWal->fileId, pWal->fd, pHead->version, pWal->version, pHead->len);
+    wTrace("vgId:%d, write wal, fileId:%" PRId64 " tfd:%" PRId64 " hver:%" PRId64 " wver:%" PRIu64 " len:%d", pWal->vgId,
+           pWal->fileId, pWal->tfd, pHead->version, pWal->version, pHead->len);
     pWal->version = pHead->version;
   }
 
@@ -141,11 +142,11 @@ int32_t walWrite(void *handle, SWalHead *pHead) {
 
 void walFsync(void *handle, bool forceFsync) {
   SWal *pWal = handle;
-  if (pWal == NULL || pWal->fd < 0) return;
+  if (pWal == NULL || !tfValid(pWal->tfd)) return;
 
   if (forceFsync || (pWal->level == TAOS_WAL_FSYNC && pWal->fsyncPeriod == 0)) {
     wTrace("vgId:%d, fileId:%" PRId64 ", do fsync", pWal->vgId, pWal->fileId);
-    if (fsync(pWal->fd) < 0) {
+    if (tfFsync(pWal->tfd) < 0) {
       wError("vgId:%d, fileId:%" PRId64 ", fsync failed since %s", pWal->vgId, pWal->fileId, strerror(errno));
     }
   }
@@ -186,8 +187,8 @@ int32_t walRestore(void *handle, void *pVnode, FWalWrite writeFp) {
     // open the existing WAL file in append mode
     pWal->fileId = 0;
     snprintf(pWal->name, sizeof(pWal->name), "%s/%s%" PRId64, pWal->path, WAL_PREFIX, pWal->fileId);
-    pWal->fd = open(pWal->name, O_WRONLY | O_CREAT | O_APPEND, S_IRWXU | S_IRWXG | S_IRWXO);
-    if (pWal->fd < 0) {
+    pWal->tfd = tfOpenM(pWal->name, O_WRONLY | O_CREAT | O_APPEND, S_IRWXU | S_IRWXG | S_IRWXO);
+    if (!tfValid(pWal->tfd)) {
       wError("vgId:%d, file:%s, failed to open since %s", pWal->vgId, pWal->name, strerror(errno));
       return TAOS_SYSTEM_ERROR(errno);
     }
@@ -217,22 +218,22 @@ int32_t walGetWalFile(void *handle, char *fileName, int64_t *fileId) {
   return code;
 }
 
-static void walFtruncate(SWal *pWal, int32_t fd, int64_t offset) {
-  taosFtruncate(fd, offset);
-  fsync(fd);
+static void walFtruncate(SWal *pWal, int64_t tfd, int64_t offset) {
+  tfFtruncate(tfd, offset);
+  tfFsync(tfd);
 }
 
-static int32_t walSkipCorruptedRecord(SWal *pWal, SWalHead *pHead, int32_t fd, int64_t *offset) {
+static int32_t walSkipCorruptedRecord(SWal *pWal, SWalHead *pHead, int64_t tfd, int64_t *offset) {
   int64_t pos = *offset;
   while (1) {
     pos++;
 
-    if (lseek(fd, pos, SEEK_SET) < 0) {
+    if (tfLseek(tfd, pos, SEEK_SET) < 0) {
       wError("vgId:%d, failed to seek from corrupted wal file since %s", pWal->vgId, strerror(errno));
       return TSDB_CODE_WAL_FILE_CORRUPTED;
     }
 
-    if (taosRead(fd, pHead, sizeof(SWalHead)) <= 0) {
+    if (tfRead(tfd, pHead, sizeof(SWalHead)) <= 0) {
       wError("vgId:%d, read to end of corrupted wal file, offset:%" PRId64, pWal->vgId, pos);
       return TSDB_CODE_WAL_FILE_CORRUPTED;
     }
@@ -259,8 +260,8 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
     return TAOS_SYSTEM_ERROR(errno);
   }
 
-  int32_t fd = open(name, O_RDWR);
-  if (fd < 0) {
+  int64_t tfd = tfOpen(name, O_RDWR);
+  if (!tfValid(tfd)) {
     wError("vgId:%d, file:%s, failed to open for restore since %s", pWal->vgId, name, strerror(errno));
     tfree(buffer);
     return TAOS_SYSTEM_ERROR(errno);
@@ -273,7 +274,7 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
   SWalHead *pHead = buffer;
 
   while (1) {
-    int32_t ret = taosRead(fd, pHead, sizeof(SWalHead));
+    int32_t ret = tfRead(tfd, pHead, sizeof(SWalHead));
     if (ret == 0) break;
 
     if (ret < 0) {
@@ -284,16 +285,16 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
 
     if (ret < sizeof(SWalHead)) {
       wError("vgId:%d, file:%s, failed to read wal head, ret is %d", pWal->vgId, name, ret);
-      walFtruncate(pWal, fd, offset);
+      walFtruncate(pWal, tfd, offset);
       break;
     }
 
     if (!taosCheckChecksumWhole((uint8_t *)pHead, sizeof(SWalHead))) {
       wError("vgId:%d, file:%s, wal head cksum is messed up, hver:%" PRIu64 " len:%d offset:%" PRId64, pWal->vgId, name,
              pHead->version, pHead->len, offset);
-      code = walSkipCorruptedRecord(pWal, pHead, fd, &offset);
+      code = walSkipCorruptedRecord(pWal, pHead, tfd, &offset);
       if (code != TSDB_CODE_SUCCESS) {
-        walFtruncate(pWal, fd, offset);
+        walFtruncate(pWal, tfd, offset);
         break;
       }
     }
@@ -310,7 +311,7 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
       pHead = buffer;
     }
 
-    ret = taosRead(fd, pHead->cont, pHead->len);
+    ret = tfRead(tfd, pHead->cont, pHead->len);
     if (ret < 0) {
       wError("vgId:%d, file:%s, failed to read wal body since %s", pWal->vgId, name, strerror(errno));
       code = TAOS_SYSTEM_ERROR(errno);
@@ -332,7 +333,7 @@ static int32_t walRestoreWalFile(SWal *pWal, void *pVnode, FWalWrite writeFp, ch
     (*writeFp)(pVnode, pHead, TAOS_QTYPE_WAL, NULL);
   }
 
-  tclose(fd);
+  tfClose(tfd);
   tfree(buffer);
 
   return code;