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: unmount_unix.go
    path of file: ./repos/podman/vendor/github.com/containers/storage/pkg/mount
    
    the code of the file until where you have to start completion: //go:build !windows
// +build !windows

package mount

import (
	"time"

	"golang.org/x/sys/unix"
)

func unmount(target string, flags int) error {
	var err error
	for i := 0; i < 50; i++ {
		err = unix.Unmount(target, flags)
		switch err {
		case unix.EBUSY:
			time.Sleep(50 * time.Millisecond)
			continue
		case unix.EINVAL, nil:
			// Ignore "n
    
func unmount(target string, flags int) error {
	var err error
	for i := 0; i < 50; i++ {
		err = unix.Unmount(target, flags)
		switch err {
		case unix.EBUSY:
			time.Sleep(50 * time.Millisecond)
			continue
		case unix.EINVAL, nil:
			// Ignore "not mounted" error here. Note the same error
			// can be returned if flags are invalid, so this code
			// assumes that the flags value is always correct.
			return nil
		}
		break
	}

	return &mountError{
		op:     "umount",
		target: target,
		flags:  uintptr(flags),
		err:    err,
	}
}