--- orig/encrypt	2021-08-19 01:02:45.000000000 +0500
+++ patched/encrypt	2021-09-16 14:46:41.673230573 +0500
@@ -69,7 +69,20 @@
                 cryptargs="${cryptargs} --perf-no_write_workqueue"
                 ;;
             *)
-                echo "Encryption option '${cryptopt}' not known, ignoring." >&2
+                cryptoptname=${cryptopt%%=*}
+                cryptoptval=${cryptopt#*=}
+                [ "${cryptoptname}" != "${cryptoptval}" -a -n "${cryptoptval}" ]
+                cryptoptstatus=$?
+                case ${cryptoptname} in
+                    sector-size)
+                        [ ${cryptoptstatus} -eq 0 ] && cryptargs="${cryptargs} --sector-size ${cryptoptval}"
+                    ;;
+                    *)
+                        cryptoptstatus=0
+                        echo "Encryption option '${cryptopt}' not known, ignoring." >&2
+                    ;;
+                esac
+                [ ${cryptoptstatus} -ne 0 ] && echo "Encryption option '${cryptoptname}' misses a value, ignoring." >&2
                 ;;
         esac
     done