xfs: set up scrub cross-referencing helpers

Create some helper functions that we'll use later to deal with problems
we might encounter while cross referencing metadata with other metadata.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2018-01-16 18:52:14 -08:00
commit 64b12563b2
6 changed files with 240 additions and 22 deletions