Corrupted rootfs - wont boot

Had a UPS power issue this morning and suspect irrepairable rootfs.
On trying to boot, I get message

Internal error XFS_WANT_CORRUPTED_GOTO......

System wont progress with messages about XFS_REPAIR being blocked for more tahn 120 seconds etc on DM-1

Ive tried booting from CD and using the Clearos repair option to give me oportunity to run a standalone xfs_repair.
Unfortunately this only results in a missing superblock, and no discovery of the secondary copy.

Any way to get round this, or is it a reinstall?