MSDOSFS_FATMIRROR
if (pmp->pm_flags & MSDOSFS_FATMIRROR) {
pmp->pm_flags |= MSDOSFS_FATMIRROR;
pmp->pm_flags |= MSDOSFS_FATMIRROR;
if (pmp->pm_flags & MSDOSFS_FATMIRROR) {
pmp->pm_flags |= MSDOSFS_FATMIRROR;
pmp->pm_flags |= MSDOSFS_FATMIRROR;