mount: Structure needs cleaning. How to repair without losing data?

I am meeting the following issue:
[root@hostname ~]# mount /dev/db2vg/lcData /home/db2inst2
mount: mount /dev/mapper/db2vg-lcData on /home/db2inst2 failed: Structure needs cleaning
[root@hostname ~]# xfs_repair -n /dev/db2vg/lcData

a detail in the attachment.

How can I repair this filesystem without losing my data?
Thanks.