xfs: explicitly initialize meta_scrub_ops array by type
An implicit mapping to type by order of initialization seems error-prone, and doesn't lend itself to cscope-ing. Also add sanity checks about size of array vs. max types, and a defensive check that ->scrub exists before using it. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
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