You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: dircache.go
    path of file: ./repos/gocryptfs/internal/fusefrontend
    
    the code of the file until where you have to start completion: package fusefrontend

import (
	"fmt"
	"log"
	"sync"
	"syscall"
	"time"

	"github.com/rfjakob/gocryptfs/v2/internal/tlog"
)

const (
	// Number of entries in the dirCache.
	// 20 entries work well for "git stat" on a small git 
    
func (e *dirCacheEntry) Clear() {
	// An earlier clear may have already closed the fd, or the cache
	// has never been filled (fd is 0 in that case).
	// Note: package ensurefds012, imported from main, guarantees that dirCache
	// can never get fds 0,1,2.
	if e.fd > 0 {
		err := syscall.Close(e.fd)
		if err != nil {
			tlog.Warn.Printf("dirCache.Clear: Close failed: %v", err)
		}
	}
	e.fd = -1
	e.node = nil
	e.iv = nil
}