mdadm: fix update=resync regression

mdadm --assemble --update=resync started failing  with the error
"mdadm: --update=resync not understood for 1.x metadata".

It is a regression. Add omitted branch to fix error.

Resubmitted, original author is not responding.
https://lore.kernel.org/linux-raid/ZZqJlCToUS3Qrl4J@bianca.dpss.psy.unipd.it/

Fixes: 7e8daba8b793 ("super1: refactor the code for enum")
Signed-off-by: Mariusz Tkaczyk <mariusz.tkaczyk@linux.intel.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/super1.c b/super1.c
index 5fd2228e..871d19f0 100644
--- a/super1.c
+++ b/super1.c
@@ -1348,6 +1348,10 @@ static int update_super1(struct supertype *st, struct mdinfo *info,
 			__cpu_to_le16(info->disk.raid_disk);
 		break;
 	}
+	case UOPT_RESYNC:
+		/* make sure resync happens */
+		sb->resync_offset = 0;
+		break;
 	case UOPT_UUID:
 		copy_uuid(sb->set_uuid, info->uuid, super1.swapuuid);