diff --git a/weed/filer2/embedded/embedded_store.go b/weed/filer2/embedded/embedded_store.go
index d0cfac3f9..5cecbd25c 100644
--- a/weed/filer2/embedded/embedded_store.go
+++ b/weed/filer2/embedded/embedded_store.go
@@ -26,7 +26,7 @@ func (filer *EmbeddedStore) AddDirectoryLink(directory *filer2.Entry, delta int3
 	return nil
 }
 
-func (filer *EmbeddedStore) SetFileChunks(fullpath filer2.FullPath, fileChunks []*filer_pb.FileChunk) (err error) {
+func (filer *EmbeddedStore) UpdateEntry(entry *filer2.Entry) (err error) {
 	return nil
 }
 
diff --git a/weed/filer2/filechunks.go b/weed/filer2/filechunks.go
index 714bdab9c..834e014d9 100644
--- a/weed/filer2/filechunks.go
+++ b/weed/filer2/filechunks.go
@@ -37,6 +37,21 @@ func CompactFileChunks(chunks []*filer_pb.FileChunk) (compacted, garbage []*file
 	return
 }
 
+func FindUnusedFileChunks(oldChunks, newChunks []*filer_pb.FileChunk) (unused []*filer_pb.FileChunk) {
+
+	fileIds := make(map[string]bool)
+	for _, interval := range newChunks {
+		fileIds[interval.FileId] = true
+	}
+	for _, chunk := range oldChunks {
+		if found := fileIds[chunk.FileId]; !found {
+			unused = append(unused, chunk)
+		}
+	}
+
+	return
+}
+
 func logPrintf(name string, visibles []*visibleInterval) {
 
 	// return
diff --git a/weed/filer2/filer.go b/weed/filer2/filer.go
index facd447f8..6b83db0e6 100644
--- a/weed/filer2/filer.go
+++ b/weed/filer2/filer.go
@@ -8,7 +8,6 @@ import (
 	"path/filepath"
 	"time"
 	"os"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/glog"
 )
 
@@ -113,8 +112,8 @@ func (f *Filer) CreateEntry(entry *Entry) (error) {
 	return nil
 }
 
-func (f *Filer) SetFileChunks(p FullPath, chunks []*filer_pb.FileChunk) (err error) {
-	return f.store.SetFileChunks(p, chunks)
+func (f *Filer) UpdateEntry(entry *Entry) (err error) {
+	return f.store.UpdateEntry(entry)
 }
 
 func (f *Filer) FindEntry(p FullPath) (found bool, entry *Entry, err error) {
diff --git a/weed/filer2/filer_structure.go b/weed/filer2/filer_structure.go
index 99ca9ce5a..5e5382d35 100644
--- a/weed/filer2/filer_structure.go
+++ b/weed/filer2/filer_structure.go
@@ -69,7 +69,7 @@ var ErrNotFound = errors.New("filer: no entry is found in filer store")
 
 type FilerStore interface {
 	InsertEntry(*Entry) (error)
-	SetFileChunks(FullPath, []*filer_pb.FileChunk) (err error)
+	UpdateEntry(*Entry) (err error)
 	FindEntry(FullPath) (found bool, entry *Entry, err error)
 	DeleteEntry(FullPath) (fileEntry *Entry, err error)
 
diff --git a/weed/filer2/memdb/memdb_store.go b/weed/filer2/memdb/memdb_store.go
index 1e888cc45..ba26eb163 100644
--- a/weed/filer2/memdb/memdb_store.go
+++ b/weed/filer2/memdb/memdb_store.go
@@ -6,7 +6,6 @@ import (
 	"strings"
 	"fmt"
 	"time"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 )
 
 type MemDbStore struct {
@@ -29,16 +28,16 @@ func NewMemDbStore() (filer *MemDbStore) {
 
 func (filer *MemDbStore) InsertEntry(entry *filer2.Entry) (err error) {
 	// println("inserting", entry.FullPath)
+	entry.Crtime = time.Now()
 	filer.tree.ReplaceOrInsert(Entry{entry})
 	return nil
 }
 
-func (filer *MemDbStore) SetFileChunks(fullpath filer2.FullPath, fileChunks []*filer_pb.FileChunk) (err error) {
-	found, entry, err := filer.FindEntry(fullpath)
+func (filer *MemDbStore) UpdateEntry(entry *filer2.Entry) (err error) {
+	found, entry, err := filer.FindEntry(entry.FullPath)
 	if !found {
-		return fmt.Errorf("No such file: %s", fullpath)
+		return fmt.Errorf("No such file: %s", entry.FullPath)
 	}
-	entry.Chunks = fileChunks
 	entry.Mtime = time.Now()
 	filer.tree.ReplaceOrInsert(Entry{entry})
 	return nil
diff --git a/weed/filesys/dir.go b/weed/filesys/dir.go
index 90c95d4ce..3a0ca9b31 100644
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -76,6 +76,16 @@ func (dir *Dir) Attr(context context.Context, attr *fuse.Attr) error {
 	return nil
 }
 
+func (dir *Dir) newFile(name string, chunks []*filer_pb.FileChunk) *File {
+	return &File{
+		Name: name,
+		dir:  dir,
+		wfs:  dir.wfs,
+		// attributes: &filer_pb.FuseAttributes{},
+		Chunks: chunks,
+	}
+}
+
 func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 	resp *fuse.CreateResponse) (fs.Node, fs.Handle, error) {
 
@@ -104,7 +114,7 @@ func (dir *Dir) Create(ctx context.Context, req *fuse.CreateRequest,
 	})
 
 	if err == nil {
-		node := &File{Name: req.Name, dir: dir, wfs: dir.wfs}
+		node := dir.newFile(req.Name, nil)
 		dir.NodeMap[req.Name] = node
 		return node, node, nil
 	}
@@ -186,7 +196,7 @@ func (dir *Dir) Lookup(ctx context.Context, name string) (node fs.Node, err erro
 		if entry.IsDirectory {
 			node = &Dir{Path: path.Join(dir.Path, name), wfs: dir.wfs}
 		} else {
-			node = &File{Chunks: entry.Chunks, Name: name, dir: dir, wfs: dir.wfs}
+			node = dir.newFile(name, entry.Chunks)
 		}
 		dir.NodeMap[name] = node
 		return node, nil
diff --git a/weed/filesys/file.go b/weed/filesys/file.go
index 81dcba0d9..bbb014bd4 100644
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -17,7 +17,7 @@ import (
 )
 
 var _ = fs.Node(&File{})
-// var _ = fs.NodeOpener(&File{})
+var _ = fs.NodeOpener(&File{})
 var _ = fs.NodeFsyncer(&File{})
 var _ = fs.Handle(&File{})
 var _ = fs.HandleReadAller(&File{})
@@ -28,58 +28,63 @@ var _ = fs.HandleReleaser(&File{})
 var _ = fs.NodeSetattrer(&File{})
 
 type File struct {
-	Chunks []*filer_pb.FileChunk
-	Name   string
-	dir    *Dir
-	wfs    *WFS
+	Chunks     []*filer_pb.FileChunk
+	Name       string
+	dir        *Dir
+	wfs        *WFS
+	isOpened   bool
+	attributes *filer_pb.FuseAttributes
 }
 
 func (file *File) Attr(context context.Context, attr *fuse.Attr) error {
-	fullPath := filepath.Join(file.dir.Path, file.Name)
-	item := file.wfs.listDirectoryEntriesCache.Get(fullPath)
-	var attributes *filer_pb.FuseAttributes
-	if item != nil {
-		attributes = item.Value().(*filer_pb.FuseAttributes)
-		glog.V(1).Infof("read cached file %v attributes", file.Name)
-	} else {
-		err := file.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
-
-			request := &filer_pb.GetEntryAttributesRequest{
-				Name:      file.Name,
-				ParentDir: file.dir.Path,
-			}
 
-			glog.V(1).Infof("read file size: %v", request)
-			resp, err := client.GetEntryAttributes(context, request)
-			if err != nil {
-				glog.V(0).Infof("read file attributes %v: %v", request, err)
-				return err
-			}
+	if !file.isOpened || file.attributes == nil {
+		fullPath := filepath.Join(file.dir.Path, file.Name)
+		item := file.wfs.listDirectoryEntriesCache.Get(fullPath)
+		if item != nil {
+			file.attributes = item.Value().(*filer_pb.FuseAttributes)
+			glog.V(1).Infof("read cached file %v attributes", file.Name)
+		} else {
+			err := file.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-			attributes = resp.Attributes
+				request := &filer_pb.GetEntryAttributesRequest{
+					Name:      file.Name,
+					ParentDir: file.dir.Path,
+				}
 
-			return nil
-		})
+				glog.V(1).Infof("read file size: %v", request)
+				resp, err := client.GetEntryAttributes(context, request)
+				if err != nil {
+					glog.V(0).Infof("read file attributes %v: %v", request, err)
+					return err
+				}
 
-		if err != nil {
-			return err
+				file.attributes = resp.Attributes
+
+				return nil
+			})
+
+			if err != nil {
+				return err
+			}
 		}
 	}
 
-	attr.Mode = os.FileMode(attributes.FileMode)
-	attr.Size = attributes.FileSize
-	attr.Mtime = time.Unix(attributes.Mtime, 0)
-	attr.Gid = attributes.Gid
-	attr.Uid = attributes.Uid
+	attr.Mode = os.FileMode(file.attributes.FileMode)
+	attr.Size = filer2.TotalSize(file.Chunks)
+	attr.Mtime = time.Unix(file.attributes.Mtime, 0)
+	attr.Gid = file.attributes.Gid
+	attr.Uid = file.attributes.Uid
 
 	return nil
 
 }
 
-func (file *File) xOpen(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fs.Handle, error) {
+func (file *File) Open(ctx context.Context, req *fuse.OpenRequest, resp *fuse.OpenResponse) (fs.Handle, error) {
 	fullPath := filepath.Join(file.dir.Path, file.Name)
 
 	fmt.Printf("Open %v %+v\n", fullPath, req)
+	file.isOpened = true
 
 	return file, nil
 
@@ -89,10 +94,28 @@ func (file *File) Setattr(ctx context.Context, req *fuse.SetattrRequest, resp *f
 	fullPath := filepath.Join(file.dir.Path, file.Name)
 
 	fmt.Printf("Setattr %v %+v\n", fullPath, req)
-	if req.Valid.Size() && req.Size == 0 {
-		fmt.Printf("truncate %v \n", fullPath)
-		file.Chunks = nil
-		resp.Attr.Size = 0
+	if req.Valid.Size() {
+
+		if req.Size == 0 {
+			fmt.Printf("truncate %v \n", fullPath)
+			file.Chunks = nil
+		}
+		file.attributes.FileSize = req.Size
+	}
+	if req.Valid.Mode() {
+		file.attributes.FileMode = uint32(req.Mode)
+	}
+
+	if req.Valid.Uid() {
+		file.attributes.Uid = req.Uid
+	}
+
+	if req.Valid.Gid() {
+		file.attributes.Gid = req.Gid
+	}
+
+	if req.Valid.Mtime() {
+		file.attributes.Mtime = req.Mtime.Unix()
 	}
 
 	return nil
@@ -152,16 +175,17 @@ func (file *File) Flush(ctx context.Context, req *fuse.FlushRequest) error {
 
 	err := file.wfs.withFilerClient(func(client filer_pb.SeaweedFilerClient) error {
 
-		request := &filer_pb.SetFileChunksRequest{
+		request := &filer_pb.UpdateEntryRequest{
 			Directory: file.dir.Path,
 			Entry: &filer_pb.Entry{
-				Name:   file.Name,
-				Chunks: file.Chunks,
+				Name:       file.Name,
+				Attributes: file.attributes,
+				Chunks:     file.Chunks,
 			},
 		}
 
 		glog.V(1).Infof("append chunks: %v", request)
-		if _, err := client.SetFileChunks(ctx, request); err != nil {
+		if _, err := client.UpdateEntry(ctx, request); err != nil {
 			return fmt.Errorf("create file: %v", err)
 		}
 
@@ -224,7 +248,8 @@ func (file *File) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.
 
 func (file *File) Release(ctx context.Context, req *fuse.ReleaseRequest) error {
 
-	// fmt.Printf("release file %+v\n", req)
+	fmt.Printf("release file %+v\n", req)
+	file.isOpened = false
 
 	return nil
 }
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 1f440d19c..e789f9d38 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -21,7 +21,7 @@ service SeaweedFiler {
     rpc CreateEntry (CreateEntryRequest) returns (CreateEntryResponse) {
     }
 
-    rpc SetFileChunks (SetFileChunksRequest) returns (SetFileChunksResponse) {
+    rpc UpdateEntry (UpdateEntryRequest) returns (UpdateEntryResponse) {
     }
 
     rpc DeleteEntry (DeleteEntryRequest) returns (DeleteEntryResponse) {
@@ -121,9 +121,9 @@ message AssignVolumeResponse {
     int32 count = 4;
 }
 
-message SetFileChunksRequest {
+message UpdateEntryRequest {
     string directory = 1;
     Entry entry = 2;
 }
-message SetFileChunksResponse {
+message UpdateEntryResponse {
 }
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index a8a20ffe6..7ef1c294b 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -26,8 +26,8 @@ It has these top-level messages:
 	DeleteEntryResponse
 	AssignVolumeRequest
 	AssignVolumeResponse
-	SetFileChunksRequest
-	SetFileChunksResponse
+	UpdateEntryRequest
+	UpdateEntryResponse
 */
 package filer_pb
 
@@ -475,37 +475,37 @@ func (m *AssignVolumeResponse) GetCount() int32 {
 	return 0
 }
 
-type SetFileChunksRequest struct {
+type UpdateEntryRequest struct {
 	Directory string `protobuf:"bytes,1,opt,name=directory" json:"directory,omitempty"`
 	Entry     *Entry `protobuf:"bytes,2,opt,name=entry" json:"entry,omitempty"`
 }
 
-func (m *SetFileChunksRequest) Reset()                    { *m = SetFileChunksRequest{} }
-func (m *SetFileChunksRequest) String() string            { return proto.CompactTextString(m) }
-func (*SetFileChunksRequest) ProtoMessage()               {}
-func (*SetFileChunksRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
+func (m *UpdateEntryRequest) Reset()                    { *m = UpdateEntryRequest{} }
+func (m *UpdateEntryRequest) String() string            { return proto.CompactTextString(m) }
+func (*UpdateEntryRequest) ProtoMessage()               {}
+func (*UpdateEntryRequest) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{17} }
 
-func (m *SetFileChunksRequest) GetDirectory() string {
+func (m *UpdateEntryRequest) GetDirectory() string {
 	if m != nil {
 		return m.Directory
 	}
 	return ""
 }
 
-func (m *SetFileChunksRequest) GetEntry() *Entry {
+func (m *UpdateEntryRequest) GetEntry() *Entry {
 	if m != nil {
 		return m.Entry
 	}
 	return nil
 }
 
-type SetFileChunksResponse struct {
+type UpdateEntryResponse struct {
 }
 
-func (m *SetFileChunksResponse) Reset()                    { *m = SetFileChunksResponse{} }
-func (m *SetFileChunksResponse) String() string            { return proto.CompactTextString(m) }
-func (*SetFileChunksResponse) ProtoMessage()               {}
-func (*SetFileChunksResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
+func (m *UpdateEntryResponse) Reset()                    { *m = UpdateEntryResponse{} }
+func (m *UpdateEntryResponse) String() string            { return proto.CompactTextString(m) }
+func (*UpdateEntryResponse) ProtoMessage()               {}
+func (*UpdateEntryResponse) Descriptor() ([]byte, []int) { return fileDescriptor0, []int{18} }
 
 func init() {
 	proto.RegisterType((*LookupDirectoryEntryRequest)(nil), "filer_pb.LookupDirectoryEntryRequest")
@@ -525,8 +525,8 @@ func init() {
 	proto.RegisterType((*DeleteEntryResponse)(nil), "filer_pb.DeleteEntryResponse")
 	proto.RegisterType((*AssignVolumeRequest)(nil), "filer_pb.AssignVolumeRequest")
 	proto.RegisterType((*AssignVolumeResponse)(nil), "filer_pb.AssignVolumeResponse")
-	proto.RegisterType((*SetFileChunksRequest)(nil), "filer_pb.SetFileChunksRequest")
-	proto.RegisterType((*SetFileChunksResponse)(nil), "filer_pb.SetFileChunksResponse")
+	proto.RegisterType((*UpdateEntryRequest)(nil), "filer_pb.UpdateEntryRequest")
+	proto.RegisterType((*UpdateEntryResponse)(nil), "filer_pb.UpdateEntryResponse")
 }
 
 // Reference imports to suppress errors if they are not otherwise used.
@@ -545,7 +545,7 @@ type SeaweedFilerClient interface {
 	GetEntryAttributes(ctx context.Context, in *GetEntryAttributesRequest, opts ...grpc.CallOption) (*GetEntryAttributesResponse, error)
 	GetFileContent(ctx context.Context, in *GetFileContentRequest, opts ...grpc.CallOption) (*GetFileContentResponse, error)
 	CreateEntry(ctx context.Context, in *CreateEntryRequest, opts ...grpc.CallOption) (*CreateEntryResponse, error)
-	SetFileChunks(ctx context.Context, in *SetFileChunksRequest, opts ...grpc.CallOption) (*SetFileChunksResponse, error)
+	UpdateEntry(ctx context.Context, in *UpdateEntryRequest, opts ...grpc.CallOption) (*UpdateEntryResponse, error)
 	DeleteEntry(ctx context.Context, in *DeleteEntryRequest, opts ...grpc.CallOption) (*DeleteEntryResponse, error)
 	AssignVolume(ctx context.Context, in *AssignVolumeRequest, opts ...grpc.CallOption) (*AssignVolumeResponse, error)
 }
@@ -603,9 +603,9 @@ func (c *seaweedFilerClient) CreateEntry(ctx context.Context, in *CreateEntryReq
 	return out, nil
 }
 
-func (c *seaweedFilerClient) SetFileChunks(ctx context.Context, in *SetFileChunksRequest, opts ...grpc.CallOption) (*SetFileChunksResponse, error) {
-	out := new(SetFileChunksResponse)
-	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/SetFileChunks", in, out, c.cc, opts...)
+func (c *seaweedFilerClient) UpdateEntry(ctx context.Context, in *UpdateEntryRequest, opts ...grpc.CallOption) (*UpdateEntryResponse, error) {
+	out := new(UpdateEntryResponse)
+	err := grpc.Invoke(ctx, "/filer_pb.SeaweedFiler/UpdateEntry", in, out, c.cc, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -638,7 +638,7 @@ type SeaweedFilerServer interface {
 	GetEntryAttributes(context.Context, *GetEntryAttributesRequest) (*GetEntryAttributesResponse, error)
 	GetFileContent(context.Context, *GetFileContentRequest) (*GetFileContentResponse, error)
 	CreateEntry(context.Context, *CreateEntryRequest) (*CreateEntryResponse, error)
-	SetFileChunks(context.Context, *SetFileChunksRequest) (*SetFileChunksResponse, error)
+	UpdateEntry(context.Context, *UpdateEntryRequest) (*UpdateEntryResponse, error)
 	DeleteEntry(context.Context, *DeleteEntryRequest) (*DeleteEntryResponse, error)
 	AssignVolume(context.Context, *AssignVolumeRequest) (*AssignVolumeResponse, error)
 }
@@ -737,20 +737,20 @@ func _SeaweedFiler_CreateEntry_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
-func _SeaweedFiler_SetFileChunks_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
-	in := new(SetFileChunksRequest)
+func _SeaweedFiler_UpdateEntry_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(UpdateEntryRequest)
 	if err := dec(in); err != nil {
 		return nil, err
 	}
 	if interceptor == nil {
-		return srv.(SeaweedFilerServer).SetFileChunks(ctx, in)
+		return srv.(SeaweedFilerServer).UpdateEntry(ctx, in)
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/filer_pb.SeaweedFiler/SetFileChunks",
+		FullMethod: "/filer_pb.SeaweedFiler/UpdateEntry",
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
-		return srv.(SeaweedFilerServer).SetFileChunks(ctx, req.(*SetFileChunksRequest))
+		return srv.(SeaweedFilerServer).UpdateEntry(ctx, req.(*UpdateEntryRequest))
 	}
 	return interceptor(ctx, in, info, handler)
 }
@@ -816,8 +816,8 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 			Handler:    _SeaweedFiler_CreateEntry_Handler,
 		},
 		{
-			MethodName: "SetFileChunks",
-			Handler:    _SeaweedFiler_SetFileChunks_Handler,
+			MethodName: "UpdateEntry",
+			Handler:    _SeaweedFiler_UpdateEntry_Handler,
 		},
 		{
 			MethodName: "DeleteEntry",
@@ -835,53 +835,53 @@ var _SeaweedFiler_serviceDesc = grpc.ServiceDesc{
 func init() { proto.RegisterFile("filer.proto", fileDescriptor0) }
 
 var fileDescriptor0 = []byte{
-	// 765 bytes of a gzipped FileDescriptorProto
-	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xac, 0x56, 0xdd, 0x4e, 0xdb, 0x4a,
-	0x10, 0xc6, 0x38, 0x09, 0x64, 0x12, 0x38, 0x47, 0x93, 0x00, 0x3e, 0xe1, 0x2f, 0xc7, 0x2d, 0x15,
-	0x55, 0x25, 0x54, 0xa5, 0x37, 0xbd, 0x2c, 0x02, 0x8a, 0x2a, 0x51, 0x21, 0x19, 0x81, 0x54, 0xf5,
-	0x22, 0x4a, 0xec, 0x49, 0xba, 0xc2, 0xb1, 0x53, 0x7b, 0xdd, 0x8a, 0x5e, 0xf7, 0x55, 0xfa, 0x1e,
-	0x7d, 0xb4, 0x6a, 0xd7, 0x1b, 0x7b, 0x4d, 0x1c, 0x5a, 0xa4, 0xde, 0x79, 0xe7, 0xef, 0xfb, 0x76,
-	0x66, 0xbe, 0x4d, 0xa0, 0x31, 0x62, 0x3e, 0x45, 0x47, 0xd3, 0x28, 0xe4, 0x21, 0xae, 0xca, 0x43,
-	0x7f, 0x3a, 0xb4, 0x2f, 0x61, 0xfb, 0x22, 0x0c, 0x6f, 0x93, 0xe9, 0x29, 0x8b, 0xc8, 0xe5, 0x61,
-	0x74, 0x77, 0x16, 0xf0, 0xe8, 0xce, 0xa1, 0xcf, 0x09, 0xc5, 0x1c, 0x77, 0xa0, 0xee, 0xcd, 0x1c,
-	0x96, 0xd1, 0x35, 0x0e, 0xeb, 0x4e, 0x6e, 0x40, 0x84, 0x4a, 0x30, 0x98, 0x90, 0xb5, 0x2c, 0x1d,
-	0xf2, 0xdb, 0x3e, 0x83, 0x9d, 0xf2, 0x82, 0xf1, 0x34, 0x0c, 0x62, 0xc2, 0x03, 0xa8, 0x92, 0x30,
-	0xc8, 0x6a, 0x8d, 0xde, 0x3f, 0x47, 0x33, 0x2a, 0x47, 0x69, 0x5c, 0xea, 0xb5, 0x7b, 0x80, 0x17,
-	0x2c, 0xe6, 0xc2, 0xc6, 0x28, 0xfe, 0x23, 0x3a, 0xf6, 0x1b, 0x68, 0x15, 0x72, 0x14, 0xe2, 0x73,
-	0x58, 0xa1, 0xd4, 0x64, 0x19, 0x5d, 0xb3, 0x0c, 0x73, 0xe6, 0xb7, 0x7f, 0x18, 0x50, 0x95, 0xa6,
-	0xec, 0x6a, 0x46, 0x7e, 0x35, 0xfc, 0x1f, 0x9a, 0x2c, 0xee, 0xe7, 0x04, 0xc4, 0xb5, 0x57, 0x9d,
-	0x06, 0x8b, 0xb3, 0xab, 0xe2, 0x0b, 0xa8, 0xb9, 0x9f, 0x92, 0xe0, 0x36, 0xb6, 0x4c, 0x09, 0xd5,
-	0xca, 0xa1, 0xde, 0x32, 0x9f, 0x4e, 0x84, 0xcf, 0x51, 0x21, 0xf8, 0x1a, 0x60, 0xc0, 0x79, 0xc4,
-	0x86, 0x09, 0xa7, 0xd8, 0xaa, 0xc8, 0x7e, 0x58, 0x5a, 0x42, 0x12, 0xd3, 0x71, 0xe6, 0x77, 0xb4,
-	0x58, 0x7b, 0x04, 0xf5, 0xac, 0x1c, 0x6e, 0xc1, 0x8a, 0xc8, 0xe9, 0x33, 0x4f, 0xb1, 0xad, 0x89,
-	0xe3, 0x3b, 0x0f, 0x37, 0xa1, 0x16, 0x8e, 0x46, 0x31, 0x71, 0xc9, 0xd4, 0x74, 0xd4, 0x49, 0xdc,
-	0x2d, 0x66, 0xdf, 0xc8, 0x32, 0xbb, 0xc6, 0x61, 0xc5, 0x91, 0xdf, 0xd8, 0x86, 0xea, 0x84, 0xb3,
-	0x09, 0x49, 0x1a, 0xa6, 0x93, 0x1e, 0xec, 0xef, 0x06, 0xac, 0x17, 0x69, 0xe0, 0x36, 0xd4, 0x25,
-	0x9a, 0xac, 0x60, 0xc8, 0x0a, 0x72, 0x9b, 0xae, 0x0a, 0x55, 0x96, 0xb5, 0x2a, 0x59, 0xca, 0x24,
-	0xf4, 0x52, 0xd0, 0xb5, 0x34, 0xe5, 0x7d, 0xe8, 0x11, 0xfe, 0x0b, 0x66, 0xc2, 0x3c, 0x09, 0xbb,
-	0xe6, 0x88, 0x4f, 0x61, 0x19, 0x33, 0xcf, 0xaa, 0xa6, 0x96, 0x31, 0xf3, 0xec, 0x31, 0xfc, 0x77,
-	0x4e, 0x72, 0xae, 0x77, 0x5a, 0x43, 0xd4, 0x4e, 0x94, 0x4d, 0x6a, 0x17, 0x60, 0x3a, 0x88, 0x28,
-	0xe0, 0x62, 0x5a, 0x6a, 0x3d, 0xeb, 0xa9, 0xe5, 0x94, 0x45, 0x7a, 0xc7, 0x4c, 0xbd, 0x63, 0xf6,
-	0x0d, 0x74, 0xca, 0x80, 0xd4, 0x22, 0x15, 0xe7, 0x65, 0x3c, 0x62, 0x5e, 0x2f, 0x61, 0xe3, 0x9c,
-	0xb8, 0x1c, 0x59, 0x18, 0x70, 0x0a, 0xf8, 0x8c, 0xfc, 0xa2, 0xd9, 0xd9, 0x3d, 0xd8, 0xbc, 0x9f,
-	0xa1, 0x58, 0x58, 0xb0, 0xe2, 0xa6, 0x26, 0x99, 0xd2, 0x74, 0x66, 0x47, 0xfb, 0x03, 0xe0, 0x49,
-	0x44, 0x03, 0x4e, 0x8f, 0x90, 0x70, 0x26, 0xc7, 0xe5, 0x07, 0xe5, 0xb8, 0x01, 0xad, 0x42, 0xe9,
-	0x94, 0x8b, 0xcd, 0x00, 0x4f, 0xc9, 0xa7, 0x47, 0x21, 0x96, 0x3c, 0x1a, 0x73, 0xca, 0x32, 0xe7,
-	0x94, 0x25, 0x18, 0x14, 0xa0, 0x14, 0x83, 0x09, 0xb4, 0x8e, 0xe3, 0x98, 0x8d, 0x83, 0x9b, 0xd0,
-	0x4f, 0x26, 0x34, 0xa3, 0xd0, 0x86, 0xaa, 0x1b, 0x26, 0xaa, 0x45, 0x55, 0x27, 0x3d, 0xe0, 0x1e,
-	0x80, 0x1b, 0xfa, 0x3e, 0xb9, 0x9c, 0x85, 0x81, 0x22, 0xa0, 0x59, 0xb0, 0x0b, 0x8d, 0x88, 0xa6,
-	0x3e, 0x73, 0x07, 0x32, 0x20, 0xdd, 0x0d, 0xdd, 0x64, 0x7f, 0x81, 0x76, 0x11, 0x4e, 0x0d, 0x65,
-	0xa1, 0x06, 0xc5, 0x7a, 0x47, 0xbe, 0xc2, 0x12, 0x9f, 0x72, 0x37, 0x93, 0xa1, 0xcf, 0xdc, 0xbe,
-	0x70, 0x98, 0x6a, 0x37, 0xa5, 0xe5, 0x3a, 0xf2, 0x73, 0xe6, 0x15, 0x8d, 0xb9, 0xfd, 0x11, 0xda,
-	0x57, 0x6a, 0x1d, 0xe4, 0xdb, 0xf1, 0x57, 0x87, 0xbb, 0x05, 0x1b, 0xf7, 0x8a, 0xa7, 0xb7, 0xea,
-	0xfd, 0xac, 0x42, 0xf3, 0x8a, 0x06, 0x5f, 0x89, 0x3c, 0xe1, 0x8d, 0x70, 0x0c, 0xed, 0xb2, 0xc7,
-	0x1d, 0x0f, 0xf2, 0xca, 0x0f, 0xfc, 0x9a, 0x74, 0x9e, 0xfd, 0x2e, 0x4c, 0x0d, 0x75, 0x09, 0x2f,
-	0xa0, 0xa1, 0x3d, 0xe5, 0xb8, 0xa3, 0x25, 0xce, 0xfd, 0x2a, 0x74, 0x76, 0x17, 0x78, 0xb3, 0x6a,
-	0x03, 0xc0, 0x79, 0x59, 0xe3, 0x93, 0x3c, 0x6d, 0xe1, 0xeb, 0xd2, 0x79, 0xfa, 0x70, 0x50, 0x06,
-	0x71, 0x0d, 0xeb, 0x45, 0xbd, 0xe2, 0x7e, 0x21, 0x73, 0x5e, 0xfb, 0x9d, 0xee, 0xe2, 0x00, 0xbd,
-	0x0f, 0x9a, 0xee, 0xf4, 0x3e, 0xcc, 0x2b, 0x5d, 0xef, 0x43, 0x99, 0x58, 0x97, 0xd0, 0x81, 0xb5,
-	0xc2, 0xa0, 0x71, 0x2f, 0xcf, 0x28, 0x5b, 0xaf, 0xce, 0xfe, 0x42, 0xbf, 0xce, 0x50, 0xd3, 0xa5,
-	0xce, 0x70, 0xfe, 0x65, 0xd0, 0x19, 0x96, 0x89, 0x79, 0x09, 0x2f, 0xa1, 0xa9, 0xeb, 0x0b, 0xb5,
-	0x84, 0x12, 0x99, 0x77, 0xf6, 0x16, 0xb9, 0x67, 0x05, 0x87, 0x35, 0xf9, 0x87, 0xe7, 0xd5, 0xaf,
-	0x00, 0x00, 0x00, 0xff, 0xff, 0xc7, 0x51, 0xe7, 0x2b, 0xff, 0x08, 0x00, 0x00,
+	// 754 bytes of a gzipped FileDescriptorProto
+	0x1f, 0x8b, 0x08, 0x00, 0x00, 0x09, 0x6e, 0x88, 0x02, 0xff, 0xb4, 0x56, 0xdd, 0x6e, 0xd3, 0x4a,
+	0x10, 0xae, 0xeb, 0x24, 0x6d, 0x26, 0x69, 0xcf, 0xd1, 0x26, 0xed, 0xf1, 0x49, 0x7f, 0x08, 0x86,
+	0xa2, 0x22, 0xa4, 0x0a, 0x85, 0x1b, 0x2e, 0xa9, 0xda, 0x52, 0x21, 0x15, 0x55, 0x72, 0xd5, 0x4a,
+	0x5c, 0x45, 0x89, 0x3d, 0x09, 0xab, 0x3a, 0x76, 0xf0, 0xae, 0x41, 0xe5, 0x9a, 0x57, 0xe1, 0x25,
+	0x78, 0x3a, 0xb4, 0x3f, 0xb1, 0xd7, 0xd8, 0x29, 0xf4, 0x82, 0x3b, 0xef, 0xfc, 0x7c, 0xf3, 0xed,
+	0xcc, 0x7c, 0x9b, 0x40, 0x6b, 0x42, 0x43, 0x4c, 0x8e, 0xe6, 0x49, 0xcc, 0x63, 0xb2, 0x2e, 0x0f,
+	0xc3, 0xf9, 0xd8, 0xbd, 0x84, 0x9d, 0x8b, 0x38, 0xbe, 0x4d, 0xe7, 0xa7, 0x34, 0x41, 0x9f, 0xc7,
+	0xc9, 0xdd, 0x59, 0xc4, 0x93, 0x3b, 0x0f, 0x3f, 0xa5, 0xc8, 0x38, 0xd9, 0x85, 0x66, 0xb0, 0x70,
+	0x38, 0x56, 0xdf, 0x3a, 0x6c, 0x7a, 0xb9, 0x81, 0x10, 0xa8, 0x45, 0xa3, 0x19, 0x3a, 0xab, 0xd2,
+	0x21, 0xbf, 0xdd, 0x33, 0xd8, 0xad, 0x06, 0x64, 0xf3, 0x38, 0x62, 0x48, 0x0e, 0xa0, 0x8e, 0xc2,
+	0x20, 0xd1, 0x5a, 0x83, 0x7f, 0x8e, 0x16, 0x54, 0x8e, 0x54, 0x9c, 0xf2, 0xba, 0x03, 0x20, 0x17,
+	0x94, 0x71, 0x61, 0xa3, 0xc8, 0xfe, 0x88, 0x8e, 0xfb, 0x06, 0x3a, 0x85, 0x1c, 0x5d, 0xf1, 0x39,
+	0xac, 0xa1, 0x32, 0x39, 0x56, 0xdf, 0xae, 0xaa, 0xb9, 0xf0, 0xbb, 0xdf, 0x2d, 0xa8, 0x4b, 0x53,
+	0x76, 0x35, 0x2b, 0xbf, 0x1a, 0x79, 0x0c, 0x6d, 0xca, 0x86, 0x39, 0x01, 0x71, 0xed, 0x75, 0xaf,
+	0x45, 0x59, 0x76, 0x55, 0xf2, 0x02, 0x1a, 0xfe, 0xc7, 0x34, 0xba, 0x65, 0x8e, 0x2d, 0x4b, 0x75,
+	0xf2, 0x52, 0x6f, 0x69, 0x88, 0x27, 0xc2, 0xe7, 0xe9, 0x10, 0xf2, 0x1a, 0x60, 0xc4, 0x79, 0x42,
+	0xc7, 0x29, 0x47, 0xe6, 0xd4, 0x64, 0x3f, 0x1c, 0x23, 0x21, 0x65, 0x78, 0x9c, 0xf9, 0x3d, 0x23,
+	0xd6, 0x9d, 0x40, 0x33, 0x83, 0x23, 0xff, 0xc1, 0x9a, 0xc8, 0x19, 0xd2, 0x40, 0xb3, 0x6d, 0x88,
+	0xe3, 0xbb, 0x80, 0x6c, 0x43, 0x23, 0x9e, 0x4c, 0x18, 0x72, 0xc9, 0xd4, 0xf6, 0xf4, 0x49, 0xdc,
+	0x8d, 0xd1, 0xaf, 0xe8, 0xd8, 0x7d, 0xeb, 0xb0, 0xe6, 0xc9, 0x6f, 0xd2, 0x85, 0xfa, 0x8c, 0xd3,
+	0x19, 0x4a, 0x1a, 0xb6, 0xa7, 0x0e, 0xee, 0x37, 0x0b, 0x36, 0x8b, 0x34, 0xc8, 0x0e, 0x34, 0x65,
+	0x35, 0x89, 0x60, 0x49, 0x04, 0xb9, 0x4d, 0x57, 0x05, 0x94, 0x55, 0x03, 0x25, 0x4b, 0x99, 0xc5,
+	0x81, 0x2a, 0xba, 0xa1, 0x52, 0xde, 0xc7, 0x01, 0x92, 0x7f, 0xc1, 0x4e, 0x69, 0x20, 0xcb, 0x6e,
+	0x78, 0xe2, 0x53, 0x58, 0xa6, 0x34, 0x70, 0xea, 0xca, 0x32, 0xa5, 0x81, 0x3b, 0x85, 0xff, 0xcf,
+	0x51, 0xce, 0xf5, 0xce, 0x68, 0x88, 0xde, 0x89, 0xaa, 0x49, 0xed, 0x01, 0xcc, 0x47, 0x09, 0x46,
+	0x5c, 0x4c, 0x4b, 0xaf, 0x67, 0x53, 0x59, 0x4e, 0x69, 0x62, 0x76, 0xcc, 0x36, 0x3b, 0xe6, 0xde,
+	0x40, 0xaf, 0xaa, 0x90, 0x5e, 0xa4, 0xe2, 0xbc, 0xac, 0x07, 0xcc, 0xeb, 0x25, 0x6c, 0x9d, 0x23,
+	0x97, 0x23, 0x8b, 0x23, 0x8e, 0x11, 0x5f, 0x90, 0x5f, 0x36, 0x3b, 0x77, 0x00, 0xdb, 0xbf, 0x66,
+	0x68, 0x16, 0x0e, 0xac, 0xf9, 0xca, 0x24, 0x53, 0xda, 0xde, 0xe2, 0xe8, 0x7e, 0x00, 0x72, 0x92,
+	0xe0, 0x88, 0xe3, 0x03, 0x24, 0x9c, 0xc9, 0x71, 0xf5, 0x5e, 0x39, 0x6e, 0x41, 0xa7, 0x00, 0xad,
+	0xb8, 0xb8, 0x14, 0xc8, 0x29, 0x86, 0xf8, 0xa0, 0x8a, 0x15, 0x8f, 0x46, 0x49, 0x59, 0x76, 0x49,
+	0x59, 0x82, 0x41, 0xa1, 0x94, 0x66, 0x30, 0x83, 0xce, 0x31, 0x63, 0x74, 0x1a, 0xdd, 0xc4, 0x61,
+	0x3a, 0xc3, 0x05, 0x85, 0x2e, 0xd4, 0xfd, 0x38, 0xd5, 0x2d, 0xaa, 0x7b, 0xea, 0x40, 0xf6, 0x01,
+	0xfc, 0x38, 0x0c, 0xd1, 0xe7, 0x34, 0x8e, 0x34, 0x01, 0xc3, 0x42, 0xfa, 0xd0, 0x4a, 0x70, 0x1e,
+	0x52, 0x7f, 0x24, 0x03, 0xd4, 0x6e, 0x98, 0x26, 0xf7, 0x33, 0x74, 0x8b, 0xe5, 0xf4, 0x50, 0x96,
+	0x6a, 0x50, 0xac, 0x77, 0x12, 0xea, 0x5a, 0xe2, 0x53, 0xee, 0x66, 0x3a, 0x0e, 0xa9, 0x3f, 0x14,
+	0x0e, 0x5b, 0xef, 0xa6, 0xb4, 0x5c, 0x27, 0x61, 0xce, 0xbc, 0x66, 0x30, 0x17, 0xa3, 0xbd, 0x9e,
+	0x07, 0x7f, 0x6b, 0xb4, 0x05, 0x68, 0x75, 0xa3, 0xc1, 0x8f, 0x3a, 0xb4, 0xaf, 0x70, 0xf4, 0x05,
+	0x31, 0x10, 0x5b, 0x98, 0x90, 0x29, 0x74, 0xab, 0x1e, 0x76, 0x72, 0x90, 0xe3, 0xde, 0xf3, 0x4b,
+	0xd2, 0x7b, 0xf6, 0xbb, 0x30, 0x3d, 0xd0, 0x15, 0x72, 0x01, 0x2d, 0xe3, 0x19, 0x27, 0xbb, 0x46,
+	0x62, 0xe9, 0x17, 0xa1, 0xb7, 0xb7, 0xc4, 0x9b, 0xa1, 0x8d, 0x80, 0x94, 0x25, 0x4d, 0x9e, 0xe4,
+	0x69, 0x4b, 0x5f, 0x96, 0xde, 0xd3, 0xfb, 0x83, 0xb2, 0x12, 0xd7, 0xb0, 0x59, 0xd4, 0x2a, 0x79,
+	0x54, 0xc8, 0x2c, 0xeb, 0xbe, 0xd7, 0x5f, 0x1e, 0x60, 0xf6, 0xc1, 0xd0, 0x9c, 0xd9, 0x87, 0xb2,
+	0xca, 0xcd, 0x3e, 0x54, 0x09, 0x55, 0xa2, 0x19, 0x63, 0x36, 0xd1, 0xca, 0x8b, 0x65, 0xa2, 0x55,
+	0xec, 0x86, 0x42, 0x33, 0xd4, 0x68, 0xa2, 0x95, 0xdf, 0x03, 0x13, 0xad, 0x4a, 0xc2, 0x2b, 0xe4,
+	0x12, 0xda, 0xa6, 0xaa, 0x88, 0x91, 0x50, 0x21, 0xee, 0xde, 0xfe, 0x32, 0xf7, 0x02, 0x70, 0xdc,
+	0x90, 0x7f, 0x73, 0x5e, 0xfd, 0x0c, 0x00, 0x00, 0xff, 0xff, 0x9c, 0xf1, 0x24, 0x43, 0xf5, 0x08,
+	0x00, 0x00,
 }
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 3f05d777b..8d643ed2d 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -120,34 +120,46 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 	return &filer_pb.CreateEntryResponse{}, err
 }
 
-func (fs *FilerServer) SetFileChunks(ctx context.Context, req *filer_pb.SetFileChunksRequest) (*filer_pb.SetFileChunksResponse, error) {
+func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntryRequest) (*filer_pb.UpdateEntryResponse, error) {
 
 	fullpath := filepath.Join(req.Directory, req.Entry.Name)
 	found, entry, err := fs.filer.FindEntry(filer2.FullPath(fullpath))
 	if err != nil {
-		return &filer_pb.SetFileChunksResponse{}, err
+		return &filer_pb.UpdateEntryResponse{}, err
 	}
 	if !found {
-		return &filer_pb.SetFileChunksResponse{}, fmt.Errorf("file not found: %s", fullpath)
+		return &filer_pb.UpdateEntryResponse{}, fmt.Errorf("file not found: %s", fullpath)
 	}
 
-	chunks := append(entry.Chunks, req.Entry.Chunks...)
+	// remove old chunks if not included in the new ones
+	unusedChunks := filer2.FindUnusedFileChunks(entry.Chunks, req.Entry.Chunks)
 
-	chunks, garbages := filer2.CompactFileChunks(chunks)
+	chunks, garbages := filer2.CompactFileChunks(req.Entry.Chunks)
 
-	err = fs.filer.SetFileChunks(
-		filer2.FullPath(fullpath),
-		chunks,
-	)
+	err = fs.filer.UpdateEntry(&filer2.Entry{
+		FullPath: filer2.FullPath(filepath.Join(req.Directory, req.Entry.Name)),
+		Attr: filer2.Attr{
+			Mtime:  time.Unix(req.Entry.Attributes.Mtime, 0),
+			Crtime: time.Unix(req.Entry.Attributes.Mtime, 0),
+			Mode:   os.FileMode(req.Entry.Attributes.FileMode),
+			Uid:    req.Entry.Attributes.Uid,
+			Gid:    req.Entry.Attributes.Gid,
+		},
+		Chunks: chunks,
+	})
 
 	if err == nil {
-		for _, garbage := range garbages {
+		for _, garbage := range unusedChunks {
 			glog.V(0).Infof("deleting %s old chunk: %v, [%d, %d)", fullpath, garbage.FileId, garbage.Offset, garbage.Offset+int64(garbage.Size))
 			operation.DeleteFile(fs.master, garbage.FileId, fs.jwt(garbage.FileId))
 		}
+		for _, garbage := range garbages {
+			glog.V(0).Infof("deleting %s garbage chunk: %v, [%d, %d)", fullpath, garbage.FileId, garbage.Offset, garbage.Offset+int64(garbage.Size))
+			operation.DeleteFile(fs.master, garbage.FileId, fs.jwt(garbage.FileId))
+		}
 	}
 
-	return &filer_pb.SetFileChunksResponse{}, err
+	return &filer_pb.UpdateEntryResponse{}, err
 }
 
 func (fs *FilerServer) DeleteEntry(ctx context.Context, req *filer_pb.DeleteEntryRequest) (resp *filer_pb.DeleteEntryResponse, err error) {