mount: refresh and evict hot dir cache (#8174)

* mount: refresh and evict hot dir cache

* mount: guard dir update window and extend TTL

* mount: reuse timestamp for cache mark

* Apply suggestion from @gemini-code-assist[bot]

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

* mount: make dir cache tuning configurable

* mount: dedupe dir update notices

* mount: restore invalidate-all cache helper

* mount: keep hot dir tuning constants

* mount: centralize cache state reset

* mount: mark refresh completion time

* mount: allow disabling idle eviction

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

weed/admin/dash/file_browser_data.go

@@ -283,17 +283,17 @@ func (s *AdminServer) generateBreadcrumbs(dir string) []BreadcrumbItem {
 		}
 		currentPath += "/" + part
 
-	// Special handling for bucket paths
-	displayName := part
-	if len(breadcrumbs) == 1 && part == "buckets" {
-		displayName = "Object Store Buckets"
-	} else if len(breadcrumbs) == 1 && part == "table-buckets" {
-		displayName = "Table Buckets"
-	} else if len(breadcrumbs) == 2 && strings.HasPrefix(dir, "/buckets/") {
-		displayName = "📦 " + part // Add bucket icon to bucket name
-	} else if len(breadcrumbs) == 2 && strings.HasPrefix(dir, "/table-buckets/") {
-		displayName = "🧊 " + part
-	}
+		// Special handling for bucket paths
+		displayName := part
+		if len(breadcrumbs) == 1 && part == "buckets" {
+			displayName = "Object Store Buckets"
+		} else if len(breadcrumbs) == 1 && part == "table-buckets" {
+			displayName = "Table Buckets"
+		} else if len(breadcrumbs) == 2 && strings.HasPrefix(dir, "/buckets/") {
+			displayName = "📦 " + part // Add bucket icon to bucket name
+		} else if len(breadcrumbs) == 2 && strings.HasPrefix(dir, "/table-buckets/") {
+			displayName = "🧊 " + part
+		}
 
 		breadcrumbs = append(breadcrumbs, BreadcrumbItem{
 			Name: displayName,

weed/command/fuse_std.go

@@ -157,6 +157,13 @@ func runFuse(cmd *Command, args []string) bool {
 			} else {
 				panic(fmt.Errorf("cacheMetaTtlSec: %s", err))
 			}
+		case "dirIdleEvictSec":
+			if parsed, err := strconv.ParseInt(parameter.value, 0, 32); err == nil {
+				intValue := int(parsed)
+				mountOptions.dirIdleEvictSec = &intValue
+			} else {
+				panic(fmt.Errorf("dirIdleEvictSec: %s", err))
+			}
 		case "concurrentWriters":
 			i++
 			if parsed, err := strconv.ParseInt(parameter.value, 0, 32); err == nil {

weed/command/mount.go

@@ -48,6 +48,8 @@ type MountOptions struct {
 	rdmaMaxConcurrent *int
 	rdmaTimeoutMs     *int
 
+	dirIdleEvictSec *int
+
 	// FUSE performance options
 	writebackCache *bool
 	asyncDio       *bool
@@ -107,6 +109,8 @@ func init() {
 	mountOptions.rdmaMaxConcurrent = cmdMount.Flag.Int("rdma.maxConcurrent", 64, "max concurrent RDMA operations")
 	mountOptions.rdmaTimeoutMs = cmdMount.Flag.Int("rdma.timeoutMs", 5000, "RDMA operation timeout in milliseconds")
 
+	mountOptions.dirIdleEvictSec = cmdMount.Flag.Int("dirIdleEvictSec", 600, "seconds to evict idle cached directories (0 to disable)")
+
 	mountCpuProfile = cmdMount.Flag.String("cpuprofile", "", "cpu profile output file")
 	mountMemProfile = cmdMount.Flag.String("memprofile", "", "memory profile output file")
 	mountReadRetryTime = cmdMount.Flag.Duration("readRetryTime", 6*time.Second, "maximum read retry wait time")

weed/command/mount_std.go

@@ -270,6 +270,7 @@ func RunMount(option *MountOptions, umask os.FileMode) bool {
 		RdmaReadOnly:      *option.rdmaReadOnly,
 		RdmaMaxConcurrent: *option.rdmaMaxConcurrent,
 		RdmaTimeoutMs:     *option.rdmaTimeoutMs,
+		DirIdleEvictSec:   *option.dirIdleEvictSec,
 	})
 
 	// create mount root

weed/mount/inode_to_path.go

@@ -22,6 +22,19 @@ type InodeEntry struct {
 	isDirectory       bool
 	isChildrenCached  bool
 	cachedExpiresTime time.Time
+	lastAccess        time.Time
+	lastRefresh       time.Time
+	updateWindowStart time.Time
+	updateCount       int
+	needsRefresh      bool
+}
+
+func (ie *InodeEntry) resetCacheState() {
+	ie.isChildrenCached = false
+	ie.cachedExpiresTime = time.Time{}
+	ie.needsRefresh = false
+	ie.updateCount = 0
+	ie.updateWindowStart = time.Time{}
 }
 
 func (ie *InodeEntry) removeOnePath(p util.FullPath) bool {
@@ -51,7 +64,12 @@ func NewInodeToPath(root util.FullPath, ttlSec int) *InodeToPath {
 		path2inode:      make(map[util.FullPath]uint64),
 		cacheMetaTtlSec: time.Second * time.Duration(ttlSec),
 	}
-	t.inode2path[1] = &InodeEntry{[]util.FullPath{root}, 1, true, false, time.Time{}}
+	t.inode2path[1] = &InodeEntry{
+		paths:       []util.FullPath{root},
+		nlookup:     1,
+		isDirectory: true,
+		lastAccess:  time.Now(),
+	}
 	t.path2inode[root] = 1
 
 	return t
@@ -94,9 +112,16 @@ func (i *InodeToPath) Lookup(path util.FullPath, unixTime int64, isDirectory boo
 		}
 	} else {
 		if !isLookup {
-			i.inode2path[inode] = &InodeEntry{[]util.FullPath{path}, 0, isDirectory, false, time.Time{}}
+			i.inode2path[inode] = &InodeEntry{
+				paths:       []util.FullPath{path},
+				isDirectory: isDirectory,
+			}
 		} else {
-			i.inode2path[inode] = &InodeEntry{[]util.FullPath{path}, 1, isDirectory, false, time.Time{}}
+			i.inode2path[inode] = &InodeEntry{
+				paths:       []util.FullPath{path},
+				nlookup:     1,
+				isDirectory: isDirectory,
+			}
 		}
 	}
 
@@ -163,8 +188,14 @@ func (i *InodeToPath) MarkChildrenCached(fullpath util.FullPath) {
 		return
 	}
 	path.isChildrenCached = true
+	now := time.Now()
+	path.lastAccess = now
+	path.lastRefresh = now
+	path.updateCount = 0
+	path.needsRefresh = false
+	path.updateWindowStart = time.Time{}
 	if i.cacheMetaTtlSec > 0 {
-		path.cachedExpiresTime = time.Now().Add(i.cacheMetaTtlSec)
+		path.cachedExpiresTime = now.Add(i.cacheMetaTtlSec)
 	}
 }
 
@@ -200,10 +231,118 @@ func (i *InodeToPath) InvalidateAllChildrenCache() {
 	defer i.Unlock()
 	for _, entry := range i.inode2path {
 		if entry.isDirectory && entry.isChildrenCached {
-			entry.isChildrenCached = false
-			entry.cachedExpiresTime = time.Time{}
+			entry.resetCacheState()
+		}
+	}
+}
+
+func (i *InodeToPath) InvalidateChildrenCache(fullpath util.FullPath) {
+	i.Lock()
+	defer i.Unlock()
+	inode, found := i.path2inode[fullpath]
+	if !found {
+		return
+	}
+	entry, found := i.inode2path[inode]
+	if !found {
+		return
+	}
+	entry.resetCacheState()
+}
+
+func (i *InodeToPath) TouchDirectory(fullpath util.FullPath) {
+	i.Lock()
+	defer i.Unlock()
+	inode, found := i.path2inode[fullpath]
+	if !found {
+		return
+	}
+	entry, found := i.inode2path[inode]
+	if !found || !entry.isDirectory {
+		return
+	}
+	entry.lastAccess = time.Now()
+}
+
+func (i *InodeToPath) RecordDirectoryUpdate(fullpath util.FullPath, now time.Time, window time.Duration, threshold int) bool {
+	if threshold <= 0 || window <= 0 {
+		return false
+	}
+	i.Lock()
+	defer i.Unlock()
+	inode, found := i.path2inode[fullpath]
+	if !found {
+		return false
+	}
+	entry, found := i.inode2path[inode]
+	if !found || !entry.isDirectory || !entry.isChildrenCached {
+		return false
+	}
+	if entry.updateWindowStart.IsZero() || now.Sub(entry.updateWindowStart) > window {
+		entry.updateWindowStart = now
+		entry.updateCount = 0
+	}
+	entry.updateCount++
+	if entry.updateCount >= threshold {
+		entry.needsRefresh = true
+		return true
+	}
+	return false
+}
+
+func (i *InodeToPath) NeedsRefresh(fullpath util.FullPath) bool {
+	i.RLock()
+	defer i.RUnlock()
+	inode, found := i.path2inode[fullpath]
+	if !found {
+		return false
+	}
+	entry, found := i.inode2path[inode]
+	if !found || !entry.isDirectory {
+		return false
+	}
+	return entry.isChildrenCached && entry.needsRefresh
+}
+
+func (i *InodeToPath) MarkDirectoryRefreshed(fullpath util.FullPath, now time.Time) {
+	i.Lock()
+	defer i.Unlock()
+	inode, found := i.path2inode[fullpath]
+	if !found {
+		return
+	}
+	entry, found := i.inode2path[inode]
+	if !found || !entry.isDirectory {
+		return
+	}
+	entry.lastRefresh = now
+	entry.lastAccess = now
+	entry.updateCount = 0
+	entry.needsRefresh = false
+	entry.updateWindowStart = time.Time{}
+	if i.cacheMetaTtlSec > 0 {
+		entry.cachedExpiresTime = now.Add(i.cacheMetaTtlSec)
+	}
+}
+
+func (i *InodeToPath) CollectEvictableDirs(now time.Time, idle time.Duration) []util.FullPath {
+	if idle <= 0 {
+		return nil
+	}
+	i.Lock()
+	defer i.Unlock()
+	var dirs []util.FullPath
+	for _, entry := range i.inode2path {
+		if !entry.isDirectory || !entry.isChildrenCached {
+			continue
+		}
+		if entry.lastAccess.IsZero() || now.Sub(entry.lastAccess) < idle {
+			continue
 		}
+		entry.resetCacheState()
+		dirs = append(dirs, entry.paths...)
 	}
+	return dirs
 }
 
 func (i *InodeToPath) AddPath(inode uint64, path util.FullPath) {
@@ -217,10 +356,9 @@ func (i *InodeToPath) AddPath(inode uint64, path util.FullPath) {
 		ie.nlookup++
 	} else {
 		i.inode2path[inode] = &InodeEntry{
-			paths:            []util.FullPath{path},
-			nlookup:          1,
-			isDirectory:      false,
-			isChildrenCached: false,
+			paths:       []util.FullPath{path},
+			nlookup:     1,
+			isDirectory: false,
 		}
 	}
 }
@@ -268,7 +406,7 @@ func (i *InodeToPath) MovePath(sourcePath, targetPath util.FullPath) (sourceInod
 				entry.paths[i] = targetPath
 			}
 		}
-		entry.isChildrenCached = false
+		entry.resetCacheState()
 	} else {
 		glog.Errorf("MovePath %s to %s: sourceInode %d not found", sourcePath, targetPath, sourceInode)
 	}

weed/mount/meta_cache/meta_cache.go

@@ -23,23 +23,25 @@ type MetaCache struct {
 	localStore   filer.VirtualFilerStore
 	leveldbStore *leveldb.LevelDBStore // direct reference for batch operations
 	sync.RWMutex
-	uidGidMapper   *UidGidMapper
-	markCachedFn   func(fullpath util.FullPath)
-	isCachedFn     func(fullpath util.FullPath) bool
-	invalidateFunc func(fullpath util.FullPath, entry *filer_pb.Entry)
-	visitGroup     singleflight.Group // deduplicates concurrent EnsureVisited calls for the same path
+	uidGidMapper      *UidGidMapper
+	markCachedFn      func(fullpath util.FullPath)
+	isCachedFn        func(fullpath util.FullPath) bool
+	invalidateFunc    func(fullpath util.FullPath, entry *filer_pb.Entry)
+	onDirectoryUpdate func(dir util.FullPath)
+	visitGroup        singleflight.Group // deduplicates concurrent EnsureVisited calls for the same path
 }
 
 func NewMetaCache(dbFolder string, uidGidMapper *UidGidMapper, root util.FullPath,
-	markCachedFn func(path util.FullPath), isCachedFn func(path util.FullPath) bool, invalidateFunc func(util.FullPath, *filer_pb.Entry)) *MetaCache {
+	markCachedFn func(path util.FullPath), isCachedFn func(path util.FullPath) bool, invalidateFunc func(util.FullPath, *filer_pb.Entry), onDirectoryUpdate func(dir util.FullPath)) *MetaCache {
 	leveldbStore, virtualStore := openMetaStore(dbFolder)
 	return &MetaCache{
-		root:         root,
-		localStore:   virtualStore,
-		leveldbStore: leveldbStore,
-		markCachedFn: markCachedFn,
-		isCachedFn:   isCachedFn,
-		uidGidMapper: uidGidMapper,
+		root:              root,
+		localStore:        virtualStore,
+		leveldbStore:      leveldbStore,
+		markCachedFn:      markCachedFn,
+		isCachedFn:        isCachedFn,
+		uidGidMapper:      uidGidMapper,
+		onDirectoryUpdate: onDirectoryUpdate,
 		invalidateFunc: func(fullpath util.FullPath, entry *filer_pb.Entry) {
 			invalidateFunc(fullpath, entry)
 		},
@@ -193,3 +195,9 @@ func (mc *MetaCache) Debug() {
 func (mc *MetaCache) IsDirectoryCached(dirPath util.FullPath) bool {
 	return mc.isCachedFn(dirPath)
 }
+
+func (mc *MetaCache) noteDirectoryUpdate(dirPath util.FullPath) {
+	if mc.onDirectoryUpdate != nil {
+		mc.onDirectoryUpdate(dirPath)
+	}
+}

weed/mount/meta_cache/meta_cache_subscribe.go

@@ -77,6 +77,24 @@ func SubscribeMetaEvents(mc *MetaCache, selfSignature int32, client filer_pb.Fil
 		}
 		err := mc.AtomicUpdateEntryFromFiler(context.Background(), oldPath, newEntry)
 		if err == nil {
+			if message.NewEntry != nil || message.OldEntry != nil {
+				dirsToNotify := make(map[util.FullPath]struct{})
+				if oldPath != "" {
+					parent, _ := oldPath.DirAndName()
+					dirsToNotify[util.FullPath(parent)] = struct{}{}
+				}
+				if newEntry != nil {
+					newParent, _ := newEntry.DirAndName()
+					dirsToNotify[util.FullPath(newParent)] = struct{}{}
+				}
+				if message.NewEntry != nil && message.NewEntry.IsDirectory {
+					childPath := util.NewFullPath(dir, message.NewEntry.Name)
+					dirsToNotify[childPath] = struct{}{}
+				}
+				for dirPath := range dirsToNotify {
+					mc.noteDirectoryUpdate(dirPath)
+				}
+			}
 			if message.OldEntry != nil && message.NewEntry != nil {
 				oldKey := util.NewFullPath(resp.Directory, message.OldEntry.Name)
 				mc.invalidateFunc(oldKey, message.OldEntry)

weed/mount/weedfs.go

@@ -75,6 +75,9 @@ type Option struct {
 	RdmaMaxConcurrent int
 	RdmaTimeoutMs     int
 
+	// Directory cache refresh/eviction controls
+	DirIdleEvictSec int
+
 	uniqueCacheDirForRead  string
 	uniqueCacheDirForWrite string
 }
@@ -102,8 +105,19 @@ type WFS struct {
 	rdmaClient           *RDMAMountClient
 	FilerConf            *filer.FilerConf
 	filerClient          *wdclient.FilerClient // Cached volume location client
+	refreshMu            sync.Mutex
+	refreshingDirs       map[util.FullPath]struct{}
+	dirHotWindow         time.Duration
+	dirHotThreshold      int
+	dirIdleEvict         time.Duration
 }
 
+const (
+	defaultDirHotWindow    = 2 * time.Second
+	defaultDirHotThreshold = 64
+	defaultDirIdleEvict    = 10 * time.Minute
+)
+
 func NewSeaweedFileSystem(option *Option) *WFS {
 	// Only create FilerClient for direct volume access modes
 	// When VolumeServerAccess == "filerProxy", all reads go through filer, so no volume lookup needed
@@ -127,15 +141,28 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 		)
 	}
 
+	dirHotWindow := defaultDirHotWindow
+	dirHotThreshold := defaultDirHotThreshold
+	dirIdleEvict := defaultDirIdleEvict
+	if option.DirIdleEvictSec != 0 {
+		dirIdleEvict = time.Duration(option.DirIdleEvictSec) * time.Second
+	} else {
+		dirIdleEvict = 0
+	}
+
 	wfs := &WFS{
-		RawFileSystem: fuse.NewDefaultRawFileSystem(),
-		option:        option,
-		signature:     util.RandomInt32(),
-		inodeToPath:   NewInodeToPath(util.FullPath(option.FilerMountRootPath), option.CacheMetaTTlSec),
-		fhMap:         NewFileHandleToInode(),
-		dhMap:         NewDirectoryHandleToInode(),
-		filerClient:   filerClient, // nil for proxy mode, initialized for direct access
-		fhLockTable:   util.NewLockTable[FileHandleId](),
+		RawFileSystem:   fuse.NewDefaultRawFileSystem(),
+		option:          option,
+		signature:       util.RandomInt32(),
+		inodeToPath:     NewInodeToPath(util.FullPath(option.FilerMountRootPath), option.CacheMetaTTlSec),
+		fhMap:           NewFileHandleToInode(),
+		dhMap:           NewDirectoryHandleToInode(),
+		filerClient:     filerClient, // nil for proxy mode, initialized for direct access
+		fhLockTable:     util.NewLockTable[FileHandleId](),
+		refreshingDirs:  make(map[util.FullPath]struct{}),
+		dirHotWindow:    dirHotWindow,
+		dirHotThreshold: dirHotThreshold,
+		dirIdleEvict:    dirIdleEvict,
 	}
 
 	wfs.option.filerIndex = int32(rand.IntN(len(option.FilerAddresses)))
@@ -171,6 +198,10 @@ func NewSeaweedFileSystem(option *Option) *WFS {
 					}
 				}
 			}
+		}, func(dirPath util.FullPath) {
+			if wfs.inodeToPath.RecordDirectoryUpdate(dirPath, time.Now(), wfs.dirHotWindow, wfs.dirHotThreshold) {
+				wfs.maybeRefreshDirectory(dirPath)
+			}
 		})
 	grace.OnInterrupt(func() {
 		wfs.metaCache.Shutdown()
@@ -224,6 +255,7 @@ func (wfs *WFS) StartBackgroundTasks() error {
 	}, follower)
 	go wfs.loopCheckQuota()
 	go wfs.loopFlushDirtyMetadata()
+	go wfs.loopEvictIdleDirCache()
 
 	return nil
 }
@@ -339,6 +371,49 @@ func (wfs *WFS) ClearCacheDir() {
 	os.RemoveAll(wfs.option.getUniqueCacheDirForRead())
 }
 
+func (wfs *WFS) maybeRefreshDirectory(dirPath util.FullPath) {
+	if !wfs.inodeToPath.NeedsRefresh(dirPath) {
+		return
+	}
+	wfs.refreshMu.Lock()
+	if _, exists := wfs.refreshingDirs[dirPath]; exists {
+		wfs.refreshMu.Unlock()
+		return
+	}
+	wfs.refreshingDirs[dirPath] = struct{}{}
+	wfs.refreshMu.Unlock()
+
+	go func() {
+		defer func() {
+			wfs.refreshMu.Lock()
+			delete(wfs.refreshingDirs, dirPath)
+			wfs.refreshMu.Unlock()
+		}()
+		wfs.inodeToPath.InvalidateChildrenCache(dirPath)
+		if err := meta_cache.EnsureVisited(wfs.metaCache, wfs, dirPath); err != nil {
+			glog.Warningf("refresh dir cache %s: %v", dirPath, err)
+			return
+		}
+		wfs.inodeToPath.MarkDirectoryRefreshed(dirPath, time.Now())
+	}()
+}
+
+func (wfs *WFS) loopEvictIdleDirCache() {
+	if wfs.dirIdleEvict <= 0 {
+		return
+	}
+	ticker := time.NewTicker(wfs.dirIdleEvict / 2)
+	defer ticker.Stop()
+	for range ticker.C {
+		dirs := wfs.inodeToPath.CollectEvictableDirs(time.Now(), wfs.dirIdleEvict)
+		for _, dir := range dirs {
+			if err := wfs.metaCache.DeleteFolderChildren(context.Background(), dir); err != nil {
+				glog.V(2).Infof("evict dir cache %s: %v", dir, err)
+			}
+		}
+	}
+}
+
 func (option *Option) setupUniqueCacheDirectory() {
 	cacheUniqueId := util.Md5String([]byte(option.MountDirectory + string(option.FilerAddresses[0]) + option.FilerMountRootPath + version.Version()))[0:8]
 	option.uniqueCacheDirForRead = path.Join(option.CacheDirForRead, cacheUniqueId)

weed/mount/weedfs_dir_mkrm.go

@@ -71,6 +71,7 @@ func (wfs *WFS) Mkdir(cancel <-chan struct{}, in *fuse.MkdirIn, name string, out
 		// Only cache the entry if the parent directory is already cached.
 		// This avoids polluting the cache with partial directory data.
 		if wfs.metaCache.IsDirectoryCached(dirFullPath) {
+			wfs.inodeToPath.TouchDirectory(dirFullPath)
 			if err := wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)); err != nil {
 				return fmt.Errorf("local mkdir dir %s: %w", entryFullPath, err)
 			}
@@ -122,6 +123,7 @@ func (wfs *WFS) Rmdir(cancel <-chan struct{}, header *fuse.InHeader, name string
 
 	wfs.metaCache.DeleteEntry(context.Background(), entryFullPath)
 	wfs.inodeToPath.RemovePath(entryFullPath)
+	wfs.inodeToPath.TouchDirectory(dirFullPath)
 
 	return fuse.OK
 

weed/mount/weedfs_dir_read.go

@@ -163,6 +163,8 @@ func (wfs *WFS) doReadDirectory(input *fuse.ReadIn, out *fuse.DirEntryList, isPl
 	if code != fuse.OK {
 		return code
 	}
+	wfs.inodeToPath.TouchDirectory(dirPath)
+	wfs.maybeRefreshDirectory(dirPath)
 
 	var dirEntry fuse.DirEntry
 

weed/mount/weedfs_file_mkrm.go

@@ -91,6 +91,7 @@ func (wfs *WFS) Mknod(cancel <-chan struct{}, in *fuse.MknodIn, name string, out
 		// Only cache the entry if the parent directory is already cached.
 		// This avoids polluting the cache with partial directory data.
 		if wfs.metaCache.IsDirectoryCached(dirFullPath) {
+			wfs.inodeToPath.TouchDirectory(dirFullPath)
 			if err := wfs.metaCache.InsertEntry(context.Background(), filer.FromPbEntry(request.Directory, request.Entry)); err != nil {
 				return fmt.Errorf("local mknod %s: %w", entryFullPath, err)
 			}
@@ -153,6 +154,7 @@ func (wfs *WFS) Unlink(cancel <-chan struct{}, header *fuse.InHeader, name strin
 		glog.V(3).Infof("local DeleteEntry %s: %v", entryFullPath, err)
 		return fuse.EIO
 	}
+	wfs.inodeToPath.TouchDirectory(dirFullPath)
 
 	wfs.inodeToPath.RemovePath(entryFullPath)
 

weed/mount/weedfs_rename.go

@@ -220,6 +220,8 @@ func (wfs *WFS) Rename(cancel <-chan struct{}, in *fuse.RenameIn, oldName string
 		glog.V(0).Infof("Link: %v", err)
 		return
 	}
+	wfs.inodeToPath.TouchDirectory(oldDir)
+	wfs.inodeToPath.TouchDirectory(newDir)
 
 	return fuse.OK