hardlink works now

16 files changed, 878 insertions, 457 deletions

diff --git a/other/java/client/src/main/proto/filer.proto b/other/java/client/src/main/proto/filer.proto
index 9a72bc976..f0334a377 100644
--- a/other/java/client/src/main/proto/filer.proto
+++ b/other/java/client/src/main/proto/filer.proto
@@ -95,6 +95,8 @@ message Entry {
     repeated FileChunk chunks = 3;
     FuseAttributes attributes = 4;
     map<string, bytes> extended = 5;
+    int64 hard_link_id = 7;
+    int32 hard_link_counter = 8; // only exists in hard link meta data
 }
 
 message FullEntry {
diff --git a/weed/filer/entry.go b/weed/filer/entry.go
index 4a73de19a..45ede0e8e 100644
--- a/weed/filer/entry.go
+++ b/weed/filer/entry.go
@@ -37,6 +37,9 @@ type Entry struct {
 
 	// the following is for files
 	Chunks []*filer_pb.FileChunk `json:"chunks,omitempty"`
+
+	HardLinkId      HardLinkId
+	HardLinkCounter int32
 }
 
 func (entry *Entry) Size() uint64 {
@@ -56,11 +59,13 @@ func (entry *Entry) ToProtoEntry() *filer_pb.Entry {
 		return nil
 	}
 	return &filer_pb.Entry{
-		Name:        entry.FullPath.Name(),
-		IsDirectory: entry.IsDirectory(),
-		Attributes:  EntryAttributeToPb(entry),
-		Chunks:      entry.Chunks,
-		Extended:    entry.Extended,
+		Name:            entry.FullPath.Name(),
+		IsDirectory:     entry.IsDirectory(),
+		Attributes:      EntryAttributeToPb(entry),
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      int64(entry.HardLinkId),
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 }
 
@@ -75,11 +80,24 @@ func (entry *Entry) ToProtoFullEntry() *filer_pb.FullEntry {
 	}
 }
 
+func (entry *Entry) Clone() *Entry {
+	return &Entry{
+		FullPath:        entry.FullPath,
+		Attr:            entry.Attr,
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      entry.HardLinkId,
+		HardLinkCounter: entry.HardLinkCounter,
+	}
+}
+
 func FromPbEntry(dir string, entry *filer_pb.Entry) *Entry {
 	return &Entry{
-		FullPath: util.NewFullPath(dir, entry.Name),
-		Attr:     PbToEntryAttribute(entry.Attributes),
-		Chunks:   entry.Chunks,
+		FullPath:        util.NewFullPath(dir, entry.Name),
+		Attr:            PbToEntryAttribute(entry.Attributes),
+		Chunks:          entry.Chunks,
+		HardLinkId:      HardLinkId(entry.HardLinkId),
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 }
 
diff --git a/weed/filer/entry_codec.go b/weed/filer/entry_codec.go
index fb6448b30..21531ad7a 100644
--- a/weed/filer/entry_codec.go
+++ b/weed/filer/entry_codec.go
@@ -13,9 +13,11 @@ import (
 
 func (entry *Entry) EncodeAttributesAndChunks() ([]byte, error) {
 	message := &filer_pb.Entry{
-		Attributes: EntryAttributeToPb(entry),
-		Chunks:     entry.Chunks,
-		Extended:   entry.Extended,
+		Attributes:      EntryAttributeToPb(entry),
+		Chunks:          entry.Chunks,
+		Extended:        entry.Extended,
+		HardLinkId:      int64(entry.HardLinkId),
+		HardLinkCounter: entry.HardLinkCounter,
 	}
 	return proto.Marshal(message)
 }
@@ -34,6 +36,9 @@ func (entry *Entry) DecodeAttributesAndChunks(blob []byte) error {
 
 	entry.Chunks = message.Chunks
 
+	entry.HardLinkId = HardLinkId(message.HardLinkId)
+	entry.HardLinkCounter = message.HardLinkCounter
+
 	return nil
 }
 
@@ -61,6 +66,10 @@ func PbToEntryAttribute(attr *filer_pb.FuseAttributes) Attr {
 
 	t := Attr{}
 
+	if attr == nil {
+		return t
+	}
+
 	t.Crtime = time.Unix(attr.Crtime, 0)
 	t.Mtime = time.Unix(attr.Mtime, 0)
 	t.Mode = os.FileMode(attr.FileMode)
@@ -106,6 +115,13 @@ func EqualEntry(a, b *Entry) bool {
 			return false
 		}
 	}
+
+	if a.HardLinkId != b.HardLinkId {
+		return false
+	}
+	if a.HardLinkCounter != b.HardLinkCounter {
+		return false
+	}
 	return true
 }
 
diff --git a/weed/filer/filer.go b/weed/filer/filer.go
index acbe63486..5b0698211 100644
--- a/weed/filer/filer.go
+++ b/weed/filer/filer.go
@@ -28,7 +28,7 @@ var (
 )
 
 type Filer struct {
-	Store               *FilerStoreWrapper
+	Store               VirtualFilerStore
 	MasterClient        *wdclient.MasterClient
 	fileIdDeletionQueue *util.UnboundedQueue
 	GrpcDialOption      grpc.DialOption
@@ -314,3 +314,11 @@ func (f *Filer) Shutdown() {
 	f.LocalMetaLogBuffer.Shutdown()
 	f.Store.Shutdown()
 }
+
+func (f *Filer) maybeDeleteHardLinks(hardLinkIds []HardLinkId) {
+	for _, hardLinkId := range hardLinkIds {
+		if err := f.Store.DeleteHardLink(context.Background(), hardLinkId); err != nil {
+			glog.Errorf("delete hard link id %d : %v", hardLinkId, err)
+		}
+	}
+}
diff --git a/weed/filer/filer_delete_entry.go b/weed/filer/filer_delete_entry.go
index 379156321..693b93f8b 100644
--- a/weed/filer/filer_delete_entry.go
+++ b/weed/filer/filer_delete_entry.go
@@ -10,6 +10,13 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/util"
 )
 
+type HardLinkId int64
+func (hardLinkId HardLinkId) Key() []byte{
+	bytes := make([]byte, 8)
+	util.Uint64toBytes(bytes, uint64(hardLinkId))
+	return bytes
+}
+
 func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (err error) {
 	if p == "/" {
 		return nil
@@ -23,16 +30,19 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	isCollection := f.isBucket(entry)
 
 	var chunks []*filer_pb.FileChunk
+	var hardLinkIds []HardLinkId
 	chunks = append(chunks, entry.Chunks...)
 	if entry.IsDirectory() {
 		// delete the folder children, not including the folder itself
 		var dirChunks []*filer_pb.FileChunk
-		dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
+		var dirHardLinkIds []HardLinkId
+		dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks && !isCollection, isFromOtherCluster, signatures)
 		if err != nil {
 			glog.V(0).Infof("delete directory %s: %v", p, err)
 			return fmt.Errorf("delete directory %s: %v", p, err)
 		}
 		chunks = append(chunks, dirChunks...)
+		hardLinkIds = append(hardLinkIds, dirHardLinkIds...)
 	}
 
 	// delete the file or folder
@@ -44,6 +54,12 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	if shouldDeleteChunks && !isCollection {
 		go f.DeleteChunks(chunks)
 	}
+	// A case not handled:
+	// what if the chunk is in a different collection?
+	if shouldDeleteChunks {
+		f.maybeDeleteHardLinks(hardLinkIds)
+	}
+
 	if isCollection {
 		collectionName := entry.Name()
 		f.doDeleteCollection(collectionName)
@@ -53,7 +69,7 @@ func (f *Filer) DeleteEntryMetaAndData(ctx context.Context, p util.FullPath, isR
 	return nil
 }
 
-func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, err error) {
+func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry, isRecursive, ignoreRecursiveError, shouldDeleteChunks, isFromOtherCluster bool, signatures []int32) (chunks []*filer_pb.FileChunk, hardlinkIds []HardLinkId, err error) {
 
 	lastFileName := ""
 	includeLastFile := false
@@ -61,26 +77,33 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 		entries, err := f.ListDirectoryEntries(ctx, entry.FullPath, lastFileName, includeLastFile, PaginationSize, "")
 		if err != nil {
 			glog.Errorf("list folder %s: %v", entry.FullPath, err)
-			return nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
+			return nil, nil, fmt.Errorf("list folder %s: %v", entry.FullPath, err)
 		}
 		if lastFileName == "" && !isRecursive && len(entries) > 0 {
 			// only for first iteration in the loop
 			glog.Errorf("deleting a folder %s has children: %+v ...", entry.FullPath, entries[0].Name())
-			return nil, fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
+			return nil, nil,fmt.Errorf("fail to delete non-empty folder: %s", entry.FullPath)
 		}
 
 		for _, sub := range entries {
 			lastFileName = sub.Name()
 			var dirChunks []*filer_pb.FileChunk
+			var dirHardLinkIds []HardLinkId
 			if sub.IsDirectory() {
-				dirChunks, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false, nil)
+				dirChunks, dirHardLinkIds, err = f.doBatchDeleteFolderMetaAndData(ctx, sub, isRecursive, ignoreRecursiveError, shouldDeleteChunks, false, nil)
 				chunks = append(chunks, dirChunks...)
+				hardlinkIds = append(hardlinkIds, dirHardLinkIds...)
 			} else {
 				f.NotifyUpdateEvent(ctx, sub, nil, shouldDeleteChunks, isFromOtherCluster, nil)
-				chunks = append(chunks, sub.Chunks...)
+				if sub.HardLinkId != 0 {
+					// hard link chunk data are deleted separately
+					hardlinkIds = append(hardlinkIds, sub.HardLinkId)
+				} else {
+					chunks = append(chunks, sub.Chunks...)
+				}
 			}
 			if err != nil && !ignoreRecursiveError {
-				return nil, err
+				return nil, nil, err
 			}
 		}
 
@@ -92,12 +115,12 @@ func (f *Filer) doBatchDeleteFolderMetaAndData(ctx context.Context, entry *Entry
 	glog.V(3).Infof("deleting directory %v delete %d chunks: %v", entry.FullPath, len(chunks), shouldDeleteChunks)
 
 	if storeDeletionErr := f.Store.DeleteFolderChildren(ctx, entry.FullPath); storeDeletionErr != nil {
-		return nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
+		return nil, nil, fmt.Errorf("filer store delete: %v", storeDeletionErr)
 	}
 
 	f.NotifyUpdateEvent(ctx, entry, nil, shouldDeleteChunks, isFromOtherCluster, signatures)
 
-	return chunks, nil
+	return chunks, hardlinkIds, nil
 }
 
 func (f *Filer) doDeleteEntryMetaAndData(ctx context.Context, entry *Entry, shouldDeleteChunks bool, isFromOtherCluster bool, signatures []int32) (err error) {
diff --git a/weed/filer/filerstore.go b/weed/filer/filerstore.go
index d313b7ba3..7dc778562 100644
--- a/weed/filer/filerstore.go
+++ b/weed/filer/filerstore.go
@@ -3,6 +3,8 @@ package filer
 import (
 	"context"
 	"errors"
+	"fmt"
+	"github.com/chrislusf/seaweedfs/weed/glog"
 	"strings"
 	"time"
 
@@ -24,7 +26,7 @@ type FilerStore interface {
 	Initialize(configuration util.Configuration, prefix string) error
 	InsertEntry(context.Context, *Entry) error
 	UpdateEntry(context.Context, *Entry) (err error)
-	// err == filer2.ErrNotFound if not found
+	// err == filer_pb.ErrNotFound if not found
 	FindEntry(context.Context, util.FullPath) (entry *Entry, err error)
 	DeleteEntry(context.Context, util.FullPath) (err error)
 	DeleteFolderChildren(context.Context, util.FullPath) (err error)
@@ -42,6 +44,11 @@ type FilerStore interface {
 	Shutdown()
 }
 
+type VirtualFilerStore interface {
+	FilerStore
+	DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error
+}
+
 type FilerStoreWrapper struct {
 	ActualStore FilerStore
 }
@@ -74,6 +81,32 @@ func (fsw *FilerStoreWrapper) InsertEntry(ctx context.Context, entry *Entry) err
 	if entry.Mime == "application/octet-stream" {
 		entry.Mime = ""
 	}
+
+	if entry.HardLinkId != 0 {
+		// check what is existing entry
+		existingEntry, err := fsw.ActualStore.FindEntry(ctx, entry.FullPath)
+
+		if err == nil && entry.HardLinkId == existingEntry.HardLinkId {
+			// updating the same entry
+			if err := fsw.updateHardLink(ctx, entry); err != nil {
+				return err
+			}
+			return nil
+		} else {
+			if err == nil && existingEntry.HardLinkId != 0 {
+				// break away from the old hard link
+				if err := fsw.DeleteHardLink(ctx, entry.HardLinkId); err != nil {
+					return err
+				}
+			}
+			// CreateLink 1.2 : update new file to hardlink mode
+			// update one existing hard link, counter ++
+			if err := fsw.increaseHardLink(ctx, entry.HardLinkId); err != nil {
+				return err
+			}
+		}
+	}
+
 	return fsw.ActualStore.InsertEntry(ctx, entry)
 }
 
@@ -88,6 +121,53 @@ func (fsw *FilerStoreWrapper) UpdateEntry(ctx context.Context, entry *Entry) err
 	if entry.Mime == "application/octet-stream" {
 		entry.Mime = ""
 	}
+
+	if entry.HardLinkId != 0 {
+		// handle hard link
+
+		// check what is existing entry
+		existingEntry, err := fsw.ActualStore.FindEntry(ctx, entry.FullPath)
+		if err != nil {
+			return fmt.Errorf("update existing entry %s: %v", entry.FullPath, err)
+		}
+
+		err = fsw.maybeReadHardLink(ctx, &Entry{HardLinkId: entry.HardLinkId})
+		if err == ErrKvNotFound {
+
+			// CreateLink 1.1 : split source entry into hardlink+empty_entry
+
+			// create hard link from existing entry, counter ++
+			existingEntry.HardLinkId = entry.HardLinkId
+			if err = fsw.createHardLink(ctx, existingEntry); err != nil {
+				return fmt.Errorf("createHardLink %d: %v", existingEntry.HardLinkId, err)
+			}
+
+			// create the empty entry
+			if err = fsw.ActualStore.UpdateEntry(ctx, &Entry{
+				FullPath:   entry.FullPath,
+				HardLinkId: entry.HardLinkId,
+			}); err != nil {
+				return fmt.Errorf("UpdateEntry to link %d: %v", entry.FullPath, err)
+			}
+			return nil
+		}
+		if err != nil {
+			return fmt.Errorf("update entry %s: %v", entry.FullPath, err)
+		}
+
+		if entry.HardLinkId != existingEntry.HardLinkId {
+			// if different hard link id, moving to a new hard link
+			glog.Fatalf("unexpected. update entry to a new link. not implemented yet.")
+		} else {
+			// updating hardlink with new metadata
+			if err = fsw.updateHardLink(ctx, entry); err != nil {
+				return fmt.Errorf("updateHardLink %d from %s: %v", entry.HardLinkId, entry.FullPath, err)
+			}
+		}
+
+		return nil
+	}
+
 	return fsw.ActualStore.UpdateEntry(ctx, entry)
 }
 
@@ -102,6 +182,9 @@ func (fsw *FilerStoreWrapper) FindEntry(ctx context.Context, fp util.FullPath) (
 	if err != nil {
 		return nil, err
 	}
+
+	fsw.maybeReadHardLink(ctx, entry)
+
 	filer_pb.AfterEntryDeserialization(entry.Chunks)
 	return
 }
@@ -113,6 +196,17 @@ func (fsw *FilerStoreWrapper) DeleteEntry(ctx context.Context, fp util.FullPath)
 		stats.FilerStoreHistogram.WithLabelValues(fsw.ActualStore.GetName(), "delete").Observe(time.Since(start).Seconds())
 	}()
 
+	existingEntry, findErr := fsw.FindEntry(ctx, fp)
+	if findErr == filer_pb.ErrNotFound {
+		return nil
+	}
+	if existingEntry.HardLinkId != 0 {
+		// remove hard link
+		if err = fsw.DeleteHardLink(ctx, existingEntry.HardLinkId); err != nil {
+			return err
+		}
+	}
+
 	return fsw.ActualStore.DeleteEntry(ctx, fp)
 }
 
@@ -138,6 +232,7 @@ func (fsw *FilerStoreWrapper) ListDirectoryEntries(ctx context.Context, dirPath
 		return nil, err
 	}
 	for _, entry := range entries {
+		fsw.maybeReadHardLink(ctx, entry)
 		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, err
@@ -157,6 +252,7 @@ func (fsw *FilerStoreWrapper) ListDirectoryPrefixedEntries(ctx context.Context,
 		return nil, err
 	}
 	for _, entry := range entries {
+		fsw.maybeReadHardLink(ctx, entry)
 		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, nil
@@ -222,3 +318,131 @@ func (fsw *FilerStoreWrapper) KvGet(ctx context.Context, key []byte) (value []by
 func (fsw *FilerStoreWrapper) KvDelete(ctx context.Context, key []byte) (err error) {
 	return fsw.ActualStore.KvDelete(ctx, key)
 }
+
+func (fsw *FilerStoreWrapper) createHardLink(ctx context.Context, entry *Entry) error {
+	if entry.HardLinkId == 0 {
+		return nil
+	}
+	key := entry.HardLinkId.Key()
+
+	_, err := fsw.KvGet(ctx, key)
+	if err != ErrKvNotFound {
+		return fmt.Errorf("create hardlink %d: already exists: %v", entry.HardLinkId, err)
+	}
+
+	entry.HardLinkCounter = 1
+
+	newBlob, encodeErr := entry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+}
+
+func (fsw *FilerStoreWrapper) updateHardLink(ctx context.Context, entry *Entry) error {
+	if entry.HardLinkId == 0 {
+		return nil
+	}
+	key := entry.HardLinkId.Key()
+
+	value, err := fsw.KvGet(ctx, key)
+	if err == ErrKvNotFound {
+		return fmt.Errorf("update hardlink %d: missing", entry.HardLinkId)
+	}
+	if err != nil {
+		return fmt.Errorf("update hardlink %d err: %v", entry.HardLinkId, err)
+	}
+
+	existingEntry := &Entry{}
+	if err = existingEntry.DecodeAttributesAndChunks(value); err != nil {
+		return err
+	}
+
+	entry.HardLinkCounter = existingEntry.HardLinkCounter
+
+	newBlob, encodeErr := entry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+}
+
+func (fsw *FilerStoreWrapper) increaseHardLink(ctx context.Context, hardLinkId HardLinkId) error {
+	if hardLinkId == 0 {
+		return nil
+	}
+	key := hardLinkId.Key()
+
+	value, err := fsw.KvGet(ctx, key)
+	if err == ErrKvNotFound {
+		return fmt.Errorf("increaseHardLink %d: missing", hardLinkId)
+	}
+	if err != nil {
+		return fmt.Errorf("increaseHardLink %d err: %v", hardLinkId, err)
+	}
+
+	existingEntry := &Entry{}
+	if err = existingEntry.DecodeAttributesAndChunks(value); err != nil {
+		return err
+	}
+
+	existingEntry.HardLinkCounter++
+
+	newBlob, encodeErr := existingEntry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+}
+
+func (fsw *FilerStoreWrapper) maybeReadHardLink(ctx context.Context, entry *Entry) error {
+	if entry.HardLinkId == 0 {
+		return nil
+	}
+	key := entry.HardLinkId.Key()
+
+	value, err := fsw.KvGet(ctx, key)
+	if err != nil {
+		glog.Errorf("read %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
+		return err
+	}
+
+	if err = entry.DecodeAttributesAndChunks(value); err != nil {
+		glog.Errorf("decode %s hardlink %d: %v", entry.FullPath, entry.HardLinkId, err)
+		return err
+	}
+
+	return nil
+}
+
+func (fsw *FilerStoreWrapper) DeleteHardLink(ctx context.Context, hardLinkId HardLinkId) error {
+	key := hardLinkId.Key()
+	value, err := fsw.KvGet(ctx, key)
+	if err == ErrKvNotFound {
+		return nil
+	}
+	if err != nil {
+		return err
+	}
+
+	entry := &Entry{}
+	if err = entry.DecodeAttributesAndChunks(value); err != nil {
+		return err
+	}
+
+	entry.HardLinkCounter--
+	if entry.HardLinkCounter <= 0 {
+		return fsw.KvDelete(ctx, key)
+	}
+
+	newBlob, encodeErr := entry.EncodeAttributesAndChunks()
+	if encodeErr != nil {
+		return encodeErr
+	}
+
+	return fsw.KvPut(ctx, key, newBlob)
+
+}
diff --git a/weed/filesys/dir.go b/weed/filesys/dir.go
index fd16d74b9..2d378f7b0 100644
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -267,6 +267,9 @@ func (dir *Dir) Lookup(ctx context.Context, req *fuse.LookupRequest, resp *fuse.
 		resp.Attr.Mode = os.FileMode(entry.Attributes.FileMode)
 		resp.Attr.Gid = entry.Attributes.Gid
 		resp.Attr.Uid = entry.Attributes.Uid
+		if entry.HardLinkCounter > 0 {
+			resp.Attr.Nlink = uint32(entry.HardLinkCounter)
+		}
 
 		return node, nil
 	}
diff --git a/weed/filesys/dir_link.go b/weed/filesys/dir_link.go
index 486dd0c9b..c15aed863 100644
--- a/weed/filesys/dir_link.go
+++ b/weed/filesys/dir_link.go
@@ -2,6 +2,7 @@ package filesys
 
 import (
 	"context"
+	"github.com/chrislusf/seaweedfs/weed/util"
 	"os"
 	"syscall"
 	"time"
@@ -13,9 +14,88 @@ import (
 	"github.com/seaweedfs/fuse/fs"
 )
 
+var _ = fs.NodeLinker(&Dir{})
 var _ = fs.NodeSymlinker(&Dir{})
 var _ = fs.NodeReadlinker(&File{})
 
+func (dir *Dir) Link(ctx context.Context, req *fuse.LinkRequest, old fs.Node) (fs.Node, error) {
+
+	oldFile, ok := old.(*File)
+	if !ok {
+		glog.Errorf("old node is not a file: %+v", old)
+	}
+
+	glog.V(4).Infof("Link: %v/%v -> %v/%v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName)
+
+	if err := oldFile.maybeLoadEntry(ctx); err != nil {
+		return nil, err
+	}
+
+	// update old file to hardlink mode
+	var updateOldEntryRequest *filer_pb.UpdateEntryRequest
+	var hardLinkId filer.HardLinkId
+	if oldFile.entry.HardLinkId != 0 {
+		hardLinkId = filer.HardLinkId(oldFile.entry.HardLinkId)
+	} else {
+		// CreateLink 1.1 : split source entry into hardlink+empty_entry
+		hardLinkId = filer.HardLinkId(util.RandomInt64())
+		updateOldEntryRequest = &filer_pb.UpdateEntryRequest{
+			Directory: oldFile.dir.FullPath(),
+			Entry: &filer_pb.Entry{
+				Name:        oldFile.entry.Name,
+				IsDirectory: oldFile.entry.IsDirectory,
+				HardLinkId:  int64(hardLinkId),
+			},
+			Signatures: []int32{dir.wfs.signature},
+		}
+	}
+
+	// CreateLink 1.2 : update new file to hardlink mode
+	request := &filer_pb.CreateEntryRequest{
+		Directory: dir.FullPath(),
+		Entry: &filer_pb.Entry{
+			Name:        req.NewName,
+			IsDirectory: false,
+			HardLinkId:  int64(hardLinkId),
+		},
+		Signatures: []int32{dir.wfs.signature},
+	}
+
+	// apply changes to the filer, and also apply to local metaCache
+	err := dir.wfs.WithFilerClient(func(client filer_pb.SeaweedFilerClient) error {
+
+		dir.wfs.mapPbIdFromLocalToFiler(request.Entry)
+		defer dir.wfs.mapPbIdFromFilerToLocal(request.Entry)
+
+		if updateOldEntryRequest != nil {
+			if err := filer_pb.UpdateEntry(client, updateOldEntryRequest); err != nil {
+				glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err)
+				return fuse.EIO
+			}
+			dir.wfs.metaCache.UpdateEntry(context.Background(), filer.FromPbEntry(updateOldEntryRequest.Directory, updateOldEntryRequest.Entry))
+			oldFile.entry.HardLinkId = int64(hardLinkId)
+		}
+
+		if err := filer_pb.CreateEntry(client, request); err != nil {
+			glog.V(0).Infof("Link %v/%v -> %s/%s: %v", oldFile.dir.FullPath(), oldFile.Name, dir.FullPath(), req.NewName, err)
+			return fuse.EIO
+		}
+		dir.wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry))
+
+		return nil
+	})
+
+	// create new file node
+	newNode := dir.newFile(req.NewName, request.Entry)
+	newFile := newNode.(*File)
+	if err := newFile.maybeLoadEntry(ctx); err != nil {
+		return nil, err
+	}
+
+	return newFile, err
+
+}
+
 func (dir *Dir) Symlink(ctx context.Context, req *fuse.SymlinkRequest) (fs.Node, error) {
 
 	glog.V(4).Infof("Symlink: %v/%v to %v", dir.FullPath(), req.NewName, req.Target)
diff --git a/weed/filesys/file.go b/weed/filesys/file.go
index d130d5898..f501e1ec8 100644
--- a/weed/filesys/file.go
+++ b/weed/filesys/file.go
@@ -67,6 +67,9 @@ func (file *File) Attr(ctx context.Context, attr *fuse.Attr) error {
 	attr.Uid = file.entry.Attributes.Uid
 	attr.Blocks = attr.Size/blockSize + 1
 	attr.BlockSize = uint32(file.wfs.option.ChunkSizeLimit)
+	if file.entry.HardLinkCounter > 0 {
+		attr.Nlink = uint32(file.entry.HardLinkCounter)
+	}
 
 	return nil
 
@@ -250,7 +253,7 @@ func (file *File) Forget() {
 }
 
 func (file *File) maybeLoadEntry(ctx context.Context) error {
-	if file.entry == nil && file.isOpen <= 0 {
+	if (file.entry == nil || file.entry.HardLinkId != 0) && file.isOpen <= 0 {
 		entry, err := file.wfs.maybeLoadEntry(file.dir.FullPath(), file.Name)
 		if err != nil {
 			glog.V(3).Infof("maybeLoadEntry file %s/%s: %v", file.dir.FullPath(), file.Name, err)
diff --git a/weed/filesys/meta_cache/meta_cache.go b/weed/filesys/meta_cache/meta_cache.go
index 06f634c72..bb81d6d27 100644
--- a/weed/filesys/meta_cache/meta_cache.go
+++ b/weed/filesys/meta_cache/meta_cache.go
@@ -8,7 +8,6 @@ import (
 	"github.com/chrislusf/seaweedfs/weed/filer"
 	"github.com/chrislusf/seaweedfs/weed/filer/leveldb"
 	"github.com/chrislusf/seaweedfs/weed/glog"
-	"github.com/chrislusf/seaweedfs/weed/pb/filer_pb"
 	"github.com/chrislusf/seaweedfs/weed/util"
 	"github.com/chrislusf/seaweedfs/weed/util/bounded_tree"
 )
@@ -17,7 +16,7 @@ import (
 // e.g. fill fileId field for chunks
 
 type MetaCache struct {
-	localStore filer.FilerStore
+	localStore filer.VirtualFilerStore
 	sync.RWMutex
 	visitedBoundary *bounded_tree.BoundedTree
 	uidGidMapper    *UidGidMapper
@@ -31,7 +30,7 @@ func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper) *MetaCache {
 	}
 }
 
-func openMetaStore(dbFolder string) filer.FilerStore {
+func openMetaStore(dbFolder string) filer.VirtualFilerStore {
 
 	os.RemoveAll(dbFolder)
 	os.MkdirAll(dbFolder, 0755)
@@ -45,7 +44,7 @@ func openMetaStore(dbFolder string) filer.FilerStore {
 		glog.Fatalf("Failed to initialize metadata cache store for %s: %+v", store.GetName(), err)
 	}
 
-	return store
+	return filer.NewFilerStoreWrapper(store)
 
 }
 
@@ -56,7 +55,6 @@ func (mc *MetaCache) InsertEntry(ctx context.Context, entry *filer.Entry) error
 }
 
 func (mc *MetaCache) doInsertEntry(ctx context.Context, entry *filer.Entry) error {
-	filer_pb.BeforeEntrySerialization(entry.Chunks)
 	return mc.localStore.InsertEntry(ctx, entry)
 }
 
@@ -94,7 +92,6 @@ func (mc *MetaCache) AtomicUpdateEntryFromFiler(ctx context.Context, oldPath uti
 func (mc *MetaCache) UpdateEntry(ctx context.Context, entry *filer.Entry) error {
 	mc.Lock()
 	defer mc.Unlock()
-	filer_pb.BeforeEntrySerialization(entry.Chunks)
 	return mc.localStore.UpdateEntry(ctx, entry)
 }
 
@@ -106,7 +103,6 @@ func (mc *MetaCache) FindEntry(ctx context.Context, fp util.FullPath) (entry *fi
 		return nil, err
 	}
 	mc.mapIdFromFilerToLocal(entry)
-	filer_pb.AfterEntryDeserialization(entry.Chunks)
 	return
 }
 
@@ -126,7 +122,6 @@ func (mc *MetaCache) ListDirectoryEntries(ctx context.Context, dirPath util.Full
 	}
 	for _, entry := range entries {
 		mc.mapIdFromFilerToLocal(entry)
-		filer_pb.AfterEntryDeserialization(entry.Chunks)
 	}
 	return entries, err
 }
diff --git a/weed/filesys/wfs.go b/weed/filesys/wfs.go
index 0335d5d98..ff8e585d7 100644
--- a/weed/filesys/wfs.go
+++ b/weed/filesys/wfs.go
@@ -208,8 +208,14 @@ func (wfs *WFS) Statfs(ctx context.Context, req *fuse.StatfsRequest, resp *fuse.
 }
 
 func (wfs *WFS) mapPbIdFromFilerToLocal(entry *filer_pb.Entry) {
+	if entry.Attributes == nil {
+		return
+	}
 	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.FilerToLocal(entry.Attributes.Uid, entry.Attributes.Gid)
 }
 func (wfs *WFS) mapPbIdFromLocalToFiler(entry *filer_pb.Entry) {
+	if entry.Attributes == nil {
+		return
+	}
 	entry.Attributes.Uid, entry.Attributes.Gid = wfs.option.UidGidMapper.LocalToFiler(entry.Attributes.Uid, entry.Attributes.Gid)
 }
diff --git a/weed/pb/filer.proto b/weed/pb/filer.proto
index 9a72bc976..f0334a377 100644
--- a/weed/pb/filer.proto
+++ b/weed/pb/filer.proto
@@ -95,6 +95,8 @@ message Entry {
     repeated FileChunk chunks = 3;
     FuseAttributes attributes = 4;
     map<string, bytes> extended = 5;
+    int64 hard_link_id = 7;
+    int32 hard_link_counter = 8; // only exists in hard link meta data
 }
 
 message FullEntry {
diff --git a/weed/pb/filer_pb/filer.pb.go b/weed/pb/filer_pb/filer.pb.go
index 00948593c..79c47548f 100644
--- a/weed/pb/filer_pb/filer.pb.go
+++ b/weed/pb/filer_pb/filer.pb.go
@@ -262,11 +262,13 @@ type Entry struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Name        string            `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
-	IsDirectory bool              `protobuf:"varint,2,opt,name=is_directory,json=isDirectory,proto3" json:"is_directory,omitempty"`
-	Chunks      []*FileChunk      `protobuf:"bytes,3,rep,name=chunks,proto3" json:"chunks,omitempty"`
-	Attributes  *FuseAttributes   `protobuf:"bytes,4,opt,name=attributes,proto3" json:"attributes,omitempty"`
-	Extended    map[string][]byte `protobuf:"bytes,5,rep,name=extended,proto3" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	Name            string            `protobuf:"bytes,1,opt,name=name,proto3" json:"name,omitempty"`
+	IsDirectory     bool              `protobuf:"varint,2,opt,name=is_directory,json=isDirectory,proto3" json:"is_directory,omitempty"`
+	Chunks          []*FileChunk      `protobuf:"bytes,3,rep,name=chunks,proto3" json:"chunks,omitempty"`
+	Attributes      *FuseAttributes   `protobuf:"bytes,4,opt,name=attributes,proto3" json:"attributes,omitempty"`
+	Extended        map[string][]byte `protobuf:"bytes,5,rep,name=extended,proto3" json:"extended,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
+	HardLinkId      int64             `protobuf:"varint,7,opt,name=hard_link_id,json=hardLinkId,proto3" json:"hard_link_id,omitempty"`
+	HardLinkCounter int32             `protobuf:"varint,8,opt,name=hard_link_counter,json=hardLinkCounter,proto3" json:"hard_link_counter,omitempty"` // only exists in hard link meta data
 }
 
 func (x *Entry) Reset() {
@@ -336,6 +338,20 @@ func (x *Entry) GetExtended() map[string][]byte {
 	return nil
 }
 
+func (x *Entry) GetHardLinkId() int64 {
+	if x != nil {
+		return x.HardLinkId
+	}
+	return 0
+}
+
+func (x *Entry) GetHardLinkCounter() int32 {
+	if x != nil {
+		return x.HardLinkCounter
+	}
+	return 0
+}
+
 type FullEntry struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -2915,7 +2931,7 @@ var file_filer_proto_rawDesc = []byte{
 	0x22, 0x3c, 0x0a, 0x13, 0x4c, 0x69, 0x73, 0x74, 0x45, 0x6e, 0x74, 0x72, 0x69, 0x65, 0x73, 0x52,
 	0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x25, 0x0a, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x0f, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72, 0x5f, 0x70,
-	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0x9d,
+	0x62, 0x2e, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x22, 0xeb,
 	0x02, 0x0a, 0x05, 0x45, 0x6e, 0x74, 0x72, 0x79, 0x12, 0x12, 0x0a, 0x04, 0x6e, 0x61, 0x6d, 0x65,
 	0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x04, 0x6e, 0x61, 0x6d, 0x65, 0x12, 0x21, 0x0a, 0x0c,
 	0x69, 0x73, 0x5f, 0x64, 0x69, 0x72, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x79, 0x18, 0x02, 0x20, 0x01,
@@ -2930,419 +2946,424 @@ var file_filer_proto_rawDesc = []byte{
 	0x65, 0x64, 0x18, 0x05, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1d, 0x2e, 0x66, 0x69, 0x6c, 0x65, 0x72,
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+	0x6f, 0x33,
 }
 
 var (
diff --git a/weed/pb/filer_pb/filer_pb_helper.go b/weed/pb/filer_pb/filer_pb_helper.go
index b6376060f..bc0fac36c 100644
--- a/weed/pb/filer_pb/filer_pb_helper.go
+++ b/weed/pb/filer_pb/filer_pb_helper.go
@@ -96,6 +96,15 @@ func CreateEntry(client SeaweedFilerClient, request *CreateEntryRequest) error {
 	return nil
 }
 
+func UpdateEntry(client SeaweedFilerClient, request *UpdateEntryRequest) error {
+	_, err := client.UpdateEntry(context.Background(), request)
+	if err != nil {
+		glog.V(1).Infof("update entry %s/%s :%v", request.Directory, request.Entry.Name, err)
+		return fmt.Errorf("UpdateEntry: %v", err)
+	}
+	return nil
+}
+
 func LookupEntry(client SeaweedFilerClient, request *LookupDirectoryEntryRequest) (*LookupDirectoryEntryResponse, error) {
 	resp, err := client.LookupDirectoryEntry(context.Background(), request)
 	if err != nil {
diff --git a/weed/server/filer_grpc_server.go b/weed/server/filer_grpc_server.go
index 41dcedba5..3ac3357ca 100644
--- a/weed/server/filer_grpc_server.go
+++ b/weed/server/filer_grpc_server.go
@@ -37,6 +37,8 @@ func (fs *FilerServer) LookupDirectoryEntry(ctx context.Context, req *filer_pb.L
 			Attributes:  filer.EntryAttributeToPb(entry),
 			Chunks:      entry.Chunks,
 			Extended:    entry.Extended,
+			HardLinkId:  int64(entry.HardLinkId),
+			HardLinkCounter: entry.HardLinkCounter,
 		},
 	}, nil
 }
@@ -80,6 +82,8 @@ func (fs *FilerServer) ListEntries(req *filer_pb.ListEntriesRequest, stream file
 					Chunks:      entry.Chunks,
 					Attributes:  filer.EntryAttributeToPb(entry),
 					Extended:    entry.Extended,
+					HardLinkId:  int64(entry.HardLinkId),
+					HardLinkCounter: entry.HardLinkCounter,
 				},
 			}); err != nil {
 				return err
@@ -154,17 +158,13 @@ func (fs *FilerServer) CreateEntry(ctx context.Context, req *filer_pb.CreateEntr
 		return &filer_pb.CreateEntryResponse{}, fmt.Errorf("CreateEntry cleanupChunks %s %s: %v", req.Directory, req.Entry.Name, err2)
 	}
 
-	if req.Entry.Attributes == nil {
-		glog.V(3).Infof("CreateEntry %s: nil attributes", filepath.Join(req.Directory, req.Entry.Name))
-		resp.Error = fmt.Sprintf("can not create entry with empty attributes")
-		return
-	}
-
 	createErr := fs.filer.CreateEntry(ctx, &filer.Entry{
 		FullPath: util.JoinPath(req.Directory, req.Entry.Name),
 		Attr:     filer.PbToEntryAttribute(req.Entry.Attributes),
 		Chunks:   chunks,
 		Extended: req.Entry.Extended,
+		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		HardLinkCounter: req.Entry.HardLinkCounter,
 	}, req.OExcl, req.IsFromOtherCluster, req.Signatures)
 
 	if createErr == nil {
@@ -197,6 +197,8 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 		Attr:     entry.Attr,
 		Extended: req.Entry.Extended,
 		Chunks:   chunks,
+		HardLinkId: filer.HardLinkId(req.Entry.HardLinkId),
+		HardLinkCounter: req.Entry.HardLinkCounter,
 	}
 
 	glog.V(3).Infof("updating %s: %+v, chunks %d: %v => %+v, chunks %d: %v, extended: %v => %v",
@@ -225,12 +227,13 @@ func (fs *FilerServer) UpdateEntry(ctx context.Context, req *filer_pb.UpdateEntr
 
 	if err = fs.filer.UpdateEntry(ctx, entry, newEntry); err == nil {
 		fs.filer.DeleteChunks(garbage)
+
+		fs.filer.NotifyUpdateEvent(ctx, entry, newEntry, true, req.IsFromOtherCluster, req.Signatures)
+
 	} else {
 		glog.V(3).Infof("UpdateEntry %s: %v", filepath.Join(req.Directory, req.Entry.Name), err)
 	}
 
-	fs.filer.NotifyUpdateEvent(ctx, entry, newEntry, true, req.IsFromOtherCluster, req.Signatures)
-
 	return &filer_pb.UpdateEntryResponse{}, err
 }
 
@@ -250,15 +253,17 @@ func (fs *FilerServer) cleanupChunks(existingEntry *filer.Entry, newEntry *filer
 	chunks, coveredChunks := filer.CompactFileChunks(fs.lookupFileId, nonManifestChunks)
 	garbage = append(garbage, coveredChunks...)
 
-	chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
-		newEntry.Attributes.Replication,
-		newEntry.Attributes.Collection,
-		"",
-		needle.SecondsToTTL(newEntry.Attributes.TtlSec),
-		false), chunks)
-	if err != nil {
-		// not good, but should be ok
-		glog.V(0).Infof("MaybeManifestize: %v", err)
+	if newEntry.Attributes != nil {
+		chunks, err = filer.MaybeManifestize(fs.saveAsChunk(
+			newEntry.Attributes.Replication,
+			newEntry.Attributes.Collection,
+			"",
+			needle.SecondsToTTL(newEntry.Attributes.TtlSec),
+			false), chunks)
+		if err != nil {
+			// not good, but should be ok
+			glog.V(0).Infof("MaybeManifestize: %v", err)
+		}
 	}
 
 	chunks = append(chunks, manifestChunks...)
diff --git a/weed/util/bytes.go b/weed/util/bytes.go
index 82e4ddeef..a7e0c20e2 100644
--- a/weed/util/bytes.go
+++ b/weed/util/bytes.go
@@ -142,3 +142,9 @@ func RandomInt32() int32 {
 	rand.Read(buf)
 	return int32(BytesToUint32(buf))
 }
+
+func RandomInt64() int64 {
+	buf := make([]byte, 8)
+	rand.Read(buf)
+	return int64(BytesToUint64(buf))
+}