From be58993f4717e6c0eef96dd3f9cf1f4fb569648c Mon Sep 17 00:00:00 2001
From: Chris Lu <chris.lu@gmail.com>
Date: Sat, 5 May 2018 23:50:34 -0700
Subject: [PATCH] ensure the same Node is returned

---
 weed/filesys/dir.go | 34 +++++++++++++++++++++++++++++-----
 1 file changed, 29 insertions(+), 5 deletions(-)

diff --git a/weed/filesys/dir.go b/weed/filesys/dir.go
index fbe2f4f3a..4978fa8dc 100644
--- a/weed/filesys/dir.go
+++ b/weed/filesys/dir.go
@@ -9,11 +9,14 @@ import (
 	"bazil.org/fuse/fs"
 	"bazil.org/fuse"
 	"github.com/chrislusf/seaweedfs/weed/filer"
+	"sync"
 )
 
 type Dir struct {
-	Path string
-	wfs  *WFS
+	Path        string
+	NodeMap     map[string]fs.Node
+	NodeMapLock sync.Mutex
+	wfs         *WFS
 }
 
 func (dir *Dir) Attr(context context.Context, attr *fuse.Attr) error {
@@ -21,16 +24,30 @@ func (dir *Dir) Attr(context context.Context, attr *fuse.Attr) error {
 	return nil
 }
 
-func (dir *Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
+func (dir *Dir) Lookup(ctx context.Context, name string) (node fs.Node, err error) {
+
+	dir.NodeMapLock.Lock()
+	defer dir.NodeMapLock.Unlock()
+
+	if dir.NodeMap == nil {
+		dir.NodeMap = make(map[string]fs.Node)
+	}
+
+	if node, ok := dir.NodeMap[name]; ok {
+		return node, nil
+	}
+
 	if entry, err := filer.LookupDirectoryEntry(dir.wfs.filer, dir.Path, name); err == nil {
 		if !entry.Found {
 			return nil, fuse.ENOENT
 		}
 		if entry.FileId != "" {
-			return &File{FileId: filer.FileId(entry.FileId), Name: name, wfs: dir.wfs}, nil
+			node = &File{FileId: filer.FileId(entry.FileId), Name: name, wfs: dir.wfs}
 		} else {
-			return &Dir{Path: path.Join(dir.Path, name), wfs: dir.wfs}, nil
+			node = &Dir{Path: path.Join(dir.Path, name), wfs: dir.wfs}
 		}
+		dir.NodeMap[name] = node
+		return node, nil
 	}
 
 	return nil, fuse.ENOENT
@@ -54,10 +71,17 @@ func (dir *Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
 }
 
 func (dir *Dir) Remove(ctx context.Context, req *fuse.RemoveRequest) error {
+
+	dir.NodeMapLock.Lock()
+	defer dir.NodeMapLock.Unlock()
+
 	name := path.Join(dir.Path, req.Name)
 	err := filer.DeleteDirectoryOrFile(dir.wfs.filer, name, req.Dir)
 	if err != nil {
 		fmt.Printf("Delete file %s [ERROR] %s\n", name, err)
+	} else {
+		delete(dir.NodeMap, req.Name)
 	}
+
 	return err
 }