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dm: do not forward ioctls from logical volumes to the underlying device
authorPaolo Bonzini <pbonzini@redhat.com>
Thu, 12 Jan 2012 15:01:29 +0000 (16:01 +0100)
committerLinus Torvalds <torvalds@linux-foundation.org>
Sat, 14 Jan 2012 23:07:24 +0000 (15:07 -0800)
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: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

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