xfs: print name of verifier if it fails

xfs: print name of verifier if it fails

Orabug: 25308089

[ Upstream commit 233135b763db7c64d07b728a9c66745fb0376275 ]

This adds a name to each buf_ops structure, so that if
a verifier fails we can print the type of verifier that
failed it.  Should be a slight debugging aid, I hope.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
(cherry picked from commit 186e7c38727f7a9fecbf238bbff9675e83842a99)
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>