let the fuse library manage directory id

otherwise, on mac, during large directory deletion, if some ReaDirAll happens, the lib seems confused about the directories, and some child directories are not deleted.

weed/filesys/dir.go

@@ -28,7 +28,7 @@ type Dir struct {
 }
 
 var _ = fs.Node(&Dir{})
-var _ = fs.NodeIdentifier(&Dir{})
+//var _ = fs.NodeIdentifier(&Dir{})
 var _ = fs.NodeCreater(&Dir{})
 var _ = fs.NodeMknoder(&Dir{})
 var _ = fs.NodeMkdirer(&Dir{})
@@ -44,7 +44,7 @@ var _ = fs.NodeRemovexattrer(&Dir{})
 var _ = fs.NodeListxattrer(&Dir{})
 var _ = fs.NodeForgetter(&Dir{})
 
-func (dir *Dir) Id() uint64 {
+func (dir *Dir) xId() uint64 {
 	return dir.id
 }
 
@@ -65,7 +65,7 @@ func (dir *Dir) Attr(ctx context.Context, attr *fuse.Attr) error {
 		return err
 	}
 
-	attr.Inode = dir.Id()
+	// attr.Inode = dir.Id()
 	attr.Mode = os.FileMode(entry.Attributes.FileMode) | os.ModeDir
 	attr.Mtime = time.Unix(entry.Attributes.Mtime, 0)
 	attr.Crtime = time.Unix(entry.Attributes.Crtime, 0)
@@ -92,7 +92,7 @@ func (dir *Dir) Getxattr(ctx context.Context, req *fuse.GetxattrRequest, resp *f
 func (dir *Dir) setRootDirAttributes(attr *fuse.Attr) {
 	// attr.Inode = 1 // filer2.FullPath(dir.Path).AsInode()
 	attr.Valid = time.Second
-	attr.Inode = dir.Id()
+	attr.Inode = 1 // dir.Id()
 	attr.Uid = dir.wfs.option.MountUid
 	attr.Gid = dir.wfs.option.MountGid
 	attr.Mode = dir.wfs.option.MountMode