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The da node block header (xfs_da3_node_hdr) contains a __pad32 field that should always be zero. Add a check for this during directory and attribute btree scrubbing. Since old kernels may have written non-zero padding without issues, flag this as an optimization opportunity (preen) rather than corruption. Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com> Reviewed-by: Darrick J. Wong <djwong@kernel.org> Signed-off-by: Carlos Maiolino <cem@kernel.org>