_scratch_mount
echo "+ chattr -R -i"
-chattr -R -f -i "${SCRATCH_MNT}/"
+$CHATTR_PROG -R -f -i "${SCRATCH_MNT}/"
echo "+ modify xattr (2)"
getfattr "${SCRATCH_MNT}/attrfile" -n "user.x00000000" 2> /dev/null && (setfattr -x "user.x00000000" "${SCRATCH_MNT}/attrfile" || _fail "modified corrupt xattr")