// used by the String method's formatting.
	ModeDir        = fs.ModeDir        // d: is a directory
	ModeAppend     = fs.ModeAppend     // a: append-only
	ModeExclusive  = fs.ModeExclusive  // l: exclusive use
	ModeTemporary  = fs.ModeTemporary  // T: temporary file; Plan 9 only
	ModeSymlink    = fs.ModeSymlink    // L: symbolic link
	ModeDevice     = fs.ModeDevice     // D: device file
	ModeNamedPipe  = fs.ModeNamedPipe  // p: named pipe (FIFO)

		fs.mode |= ModeDir
	}
	if d.Mode&syscall.DMAPPEND != 0 {
		fs.mode |= ModeAppend
	}
	if d.Mode&syscall.DMEXCL != 0 {
		fs.mode |= ModeExclusive
	}
	if d.Mode&syscall.DMTMP != 0 {
		fs.mode |= ModeTemporary
	}
	// Consider all files not served by #M as device files.
	if d.Type != 'M' {
		fs.mode |= ModeDevice
	}
	// Consider all files served by #c as character device files.
	if d.Type == 'c' {

	if a := actual.Available.Value(); a <= 0 {
		t.Errorf("Expected Available %d to be greater than 0.", a)
	}

	// Write a file and expect Used to increase
	os.WriteFile(filepath.Join(tmpDir, "f1"), []byte("Hello World"), os.ModeTemporary)
	actual, err = metrics.GetMetrics()
	if err != nil {
		t.Errorf("Unexpected error when calling GetMetrics %v", err)
	}

	o |= uint32(i.Perm())
	if i&ModeSetuid != 0 {
		o |= syscall.S_ISUID
	}
	if i&ModeSetgid != 0 {
		o |= syscall.S_ISGID
	}
	if i&ModeSticky != 0 {
		o |= syscall.S_ISVTX
	}
	// No mapping for Go's ModeTemporary (plan9 only).
	return
}

// See docs in file.go:Chmod.
func chmod(name string, mode FileMode) error {
	longName := fixLongPath(name)
	e := ignoringEINTR(func() error {

	ModeDir        FileMode = 1 << (32 - 1 - iota) // d: is a directory
	ModeAppend                                     // a: append-only
	ModeExclusive                                  // l: exclusive use
	ModeTemporary                                  // T: temporary file; Plan 9 only
	ModeSymlink                                    // L: symbolic link
	ModeDevice                                     // D: device file