xfs: kill suid/sgid through the truncate path.
XFS has failed to kill suid/sgid bits correctly when truncating files of non-zero size since commit c4ed4243 ("xfs: split xfs_setattr") introduced in the 3.1 kernel. Fix it. Fix it. cc: stable kernel <stable@vger.kernel.org> Signed-off-by: NDave Chinner <dchinner@redhat.com> Reviewed-by: NBrian Foster <bfoster@redhat.com> Signed-off-by: NBen Myers <bpm@sgi.com> (cherry picked from commit 56c19e89)
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