Support no-journal for dm-integrity devices.

As documented in integritysetup.8, dm-integrity devices support running
without a journal whatsoever. This change allows the
CRYPT_ACTIVATE_NO_JOURNAL flag (the same as is used with `integritysetup
--integrity-no-journal`) to be passed in during dmsetup by specifying
the `no-journal` option in integritytab.5.

src/integritysetup/integrity-util.c

@@ -34,6 +34,9 @@ int parse_integrity_options(
                 else if (streq(word, "allow-discards")) {
                         if (ret_activate_flags)
                                 *ret_activate_flags |= CRYPT_ACTIVATE_ALLOW_DISCARDS;
+                } else if (streq(word, "no-journal")) {
+                        if (ret_activate_flags)
+                                *ret_activate_flags |= CRYPT_ACTIVATE_NO_JOURNAL;
                 } else if ((val = startswith(word, "journal-watermark="))) {
                         r = parse_percent(val);
                         if (r < 0)