xfs: add BMAPI_NORMAP flag to perform block remapping without updating rmapbt
Add a new flag, XFS_BMAPI_NORMAP, which will perform file block remapping without updating the rmapbt. This will be used by the repair code to reconstruct bmbts from the rmapbt, in which case we don't want the rmapbt update. Signed-off-by: NDarrick J. Wong <darrick.wong@oracle.com> Reviewed-by: NDave Chinner <dchinner@redhat.com>
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