+func backdateTree(n inode, modTime time.Time) {
+ switch n := n.(type) {
+ case *filenode:
+ n.fileinfo.modTime = modTime
+ case *dirnode:
+ n.fileinfo.modTime = modTime
+ for _, n := range n.inodes {
+ backdateTree(n, modTime)
+ }
+ }
+}
+
+func (fs *collectionFileSystem) newNode(name string, perm os.FileMode, modTime time.Time) (node inode, err error) {
+ if name == "" || name == "." || name == ".." {
+ return nil, ErrInvalidArgument
+ }
+ if perm.IsDir() {
+ return &dirnode{
+ fs: fs,
+ treenode: treenode{
+ fileinfo: fileinfo{
+ name: name,
+ mode: perm | os.ModeDir,
+ modTime: modTime,
+ },
+ inodes: make(map[string]inode),
+ },
+ }, nil
+ } else {
+ return &filenode{
+ fs: fs,
+ fileinfo: fileinfo{
+ name: name,
+ mode: perm & ^os.ModeDir,
+ modTime: modTime,
+ },
+ }, nil
+ }
+}
+
+func (fs *collectionFileSystem) Child(name string, replace func(inode) (inode, error)) (inode, error) {
+ return fs.rootnode().Child(name, replace)
+}
+
+func (fs *collectionFileSystem) FS() FileSystem {
+ return fs
+}
+
+func (fs *collectionFileSystem) FileInfo() os.FileInfo {
+ return fs.rootnode().FileInfo()
+}
+
+func (fs *collectionFileSystem) IsDir() bool {
+ return true
+}
+
+func (fs *collectionFileSystem) Lock() {
+ fs.rootnode().Lock()
+}
+
+func (fs *collectionFileSystem) Unlock() {
+ fs.rootnode().Unlock()
+}
+
+func (fs *collectionFileSystem) RLock() {
+ fs.rootnode().RLock()
+}
+
+func (fs *collectionFileSystem) RUnlock() {
+ fs.rootnode().RUnlock()
+}
+
+func (fs *collectionFileSystem) Parent() inode {
+ return fs.rootnode().Parent()
+}
+
+func (fs *collectionFileSystem) Read(_ []byte, ptr filenodePtr) (int, filenodePtr, error) {
+ return 0, ptr, ErrInvalidOperation
+}
+
+func (fs *collectionFileSystem) Write(_ []byte, ptr filenodePtr) (int, filenodePtr, error) {
+ return 0, ptr, ErrInvalidOperation
+}
+
+func (fs *collectionFileSystem) Readdir() ([]os.FileInfo, error) {
+ return fs.rootnode().Readdir()
+}
+
+func (fs *collectionFileSystem) SetParent(parent inode, name string) {
+ fs.rootnode().SetParent(parent, name)
+}
+
+func (fs *collectionFileSystem) Truncate(int64) error {
+ return ErrInvalidOperation