fix aufs mount option length calculation
We add ",dirperm1" but only increase length by len("dirperm1").
@@ -573,7 +573,7 @@ func (a *Driver) aufsMount(ro []string, rw, target, mountLabel string) (err erro
offset := 54
if useDirperm() {
- offset += len("dirperm1")
+ offset += len(",dirperm1")
}
b := make([]byte, syscall.Getpagesize()-len(mountLabel)-offset) // room for xino & mountLabel
bp := copy(b, fmt.Sprintf("br:%s=rw", rw))
