diff --git a/entity/fs_file_info.go b/entity/fs_file_info.go
index 1376150..0fbf79f 100644
--- a/entity/fs_file_info.go
+++ b/entity/fs_file_info.go
@@ -2,6 +2,8 @@ package entity
 
 import (
 	"github.com/crawlab-team/crawlab-core/interfaces"
+	"os"
+	"time"
 )
 
 type FsFileInfo struct {
@@ -9,10 +11,11 @@ type FsFileInfo struct {
 	Path      string                  `json:"path"`      // file path
 	FullPath  string                  `json:"full_path"` // file full path
 	Extension string                  `json:"extension"` // file extension
-	Md5       string                  `json:"md5"`       // MD5 hash
 	IsDir     bool                    `json:"is_dir"`    // whether it is directory
 	FileSize  int64                   `json:"file_size"` // file size (bytes)
 	Children  []interfaces.FsFileInfo `json:"children"`  // children for sub-directory
+	ModTime   time.Time               `json:"mod_time"`  // modification time
+	Mode      os.FileMode             `json:"mode"`      // file mode
 }
 
 func (f *FsFileInfo) GetName() string {
@@ -31,10 +34,6 @@ func (f *FsFileInfo) GetExtension() string {
 	return f.Extension
 }
 
-func (f *FsFileInfo) GetMd5() string {
-	return f.Md5
-}
-
 func (f *FsFileInfo) GetIsDir() bool {
 	return f.IsDir
 }
@@ -43,6 +42,14 @@ func (f *FsFileInfo) GetFileSize() int64 {
 	return f.FileSize
 }
 
+func (f *FsFileInfo) GetModTime() time.Time {
+	return f.ModTime
+}
+
+func (f *FsFileInfo) GetMode() os.FileMode {
+	return f.Mode
+}
+
 func (f *FsFileInfo) GetChildren() []interfaces.FsFileInfo {
 	return f.Children
 }
diff --git a/fs/service_v2.go b/fs/service_v2.go
index 5e2ee60..f733fdb 100644
--- a/fs/service_v2.go
+++ b/fs/service_v2.go
@@ -43,9 +43,10 @@ func (svc *ServiceV2) List(path string) (files []interfaces.FsFileInfo, err erro
 			Path:      filepath.ToSlash(relPath),
 			FullPath:  p,
 			Extension: filepath.Ext(p),
-			Md5:       "",
 			IsDir:     info.IsDir(),
 			FileSize:  info.Size(),
+			ModTime:   info.ModTime(),
+			Mode:      info.Mode(),
 			Children:  nil,
 		}
 
@@ -90,9 +91,10 @@ func (svc *ServiceV2) GetFileInfo(path string) (file interfaces.FsFileInfo, err
 		Path:      path,
 		FullPath:  filepath.Join(svc.rootPath, path),
 		Extension: filepath.Ext(path),
-		Md5:       "",
 		IsDir:     f.IsDir(),
 		FileSize:  f.Size(),
+		ModTime:   f.ModTime(),
+		Mode:      f.Mode(),
 		Children:  nil,
 	}, nil
 }
diff --git a/interfaces/fs_file_info.go b/interfaces/fs_file_info.go
index 9b604ae..ee65109 100644
--- a/interfaces/fs_file_info.go
+++ b/interfaces/fs_file_info.go
@@ -1,12 +1,18 @@
 package interfaces
 
+import (
+	"os"
+	"time"
+)
+
 type FsFileInfo interface {
 	GetName() string
 	GetPath() string
 	GetFullPath() string
 	GetExtension() string
-	GetMd5() string
 	GetIsDir() bool
 	GetFileSize() int64
+	GetModTime() time.Time
+	GetMode() os.FileMode
 	GetChildren() []FsFileInfo
 }
diff --git a/task/handler/service.go b/task/handler/service.go
index 3a68221..763b98a 100644
--- a/task/handler/service.go
+++ b/task/handler/service.go
@@ -3,10 +3,11 @@ package handler
 import (
 	"context"
 	"encoding/json"
+	"errors"
 	"github.com/apex/log"
 	config2 "github.com/crawlab-team/crawlab-core/config"
 	"github.com/crawlab-team/crawlab-core/constants"
-	"github.com/crawlab-team/crawlab-core/errors"
+	errors2 "github.com/crawlab-team/crawlab-core/errors"
 	client2 "github.com/crawlab-team/crawlab-core/grpc/client"
 	"github.com/crawlab-team/crawlab-core/interfaces"
 	"github.com/crawlab-team/crawlab-core/models/client"
@@ -311,13 +312,13 @@ func (svc *Service) getRunner(taskId primitive.ObjectID) (r interfaces.TaskRunne
 	log.Debugf("[TaskHandlerService] getRunner: taskId[%v]", taskId)
 	v, ok := svc.runners.Load(taskId)
 	if !ok {
-		return nil, trace.TraceError(errors.ErrorTaskNotExists)
+		return nil, trace.TraceError(errors2.ErrorTaskNotExists)
 	}
 	switch v.(type) {
 	case interfaces.TaskRunner:
 		r = v.(interfaces.TaskRunner)
 	default:
-		return nil, trace.TraceError(errors.ErrorModelInvalidType)
+		return nil, trace.TraceError(errors2.ErrorModelInvalidType)
 	}
 	return r, nil
 }
@@ -405,7 +406,7 @@ func (svc *Service) run(taskId primitive.ObjectID) (err error) {
 	// attempt to get runner from pool
 	_, ok := svc.runners.Load(taskId)
 	if ok {
-		return trace.TraceError(errors.ErrorTaskAlreadyExists)
+		return trace.TraceError(errors2.ErrorTaskAlreadyExists)
 	}
 
 	// create a new task runner
@@ -430,10 +431,10 @@ func (svc *Service) run(taskId primitive.ObjectID) (err error) {
 		// run task process (blocking)
 		// error or finish after task runner ends
 		if err := r.Run(); err != nil {
-			switch err {
-			case constants.ErrTaskError:
+			switch {
+			case errors.Is(err, constants.ErrTaskError):
 				log.Errorf("task[%s] finished with error: %v", r.GetTaskId().Hex(), err)
-			case constants.ErrTaskCancelled:
+			case errors.Is(err, constants.ErrTaskCancelled):
 				log.Errorf("task[%s] cancelled", r.GetTaskId().Hex())
 			default:
 				log.Errorf("task[%s] finished with unknown error: %v", r.GetTaskId().Hex(), err)