xfs error : “mount: Structure needs cleaning”

# mount /dev/sdb1 /disk2
mount: Structure needs cleaning

# xfs_repair -n /dev/sdb1
# xfs_check /dev/sdb1

ERROR: The filesystem has valuable metadata changes in a log which needs to
be replayed. Mount the filesystem to replay the log, and unmount it before
re-running xfs_check. If you are unable to mount the filesystem, then use
the xfs_repair -L option to destroy the log and attempt a repair.
Note that destroying the log may cause corruption — please attempt a mount
of the filesystem before doing this.

# xfs_repair -L /dev/sdb1

# xfs_check /dev/sdb1

# mount /dev/sdb1 /disk2