xfs: add scrub cross-referencing helpers for the inode btrees

Source kernel commit: 2e001266b67c865ad904e1889658282d0773b207

Add a couple of functions to the inode btrees that will be used
to cross-reference metadata against the inobt.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>

2 files changed