dm: do not forward ioctls from logical volumes to the underlying device
A logical volume can map to just part of underlying physical volume. In this case, it must be treated like a partition. Based on a patch from Alasdair G Kergon. Cc: Alasdair G Kergon <agk@redhat.com> Cc: dm-devel@redhat.com Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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