From: Alex Elder <elder@inktank.com>
Date: Fri, 26 Oct 2012 04:34:42 +0000 (-0500)
Subject: rbd: get parent spec for version 2 images
X-Git-Tag: v3.8-rc1~21^2~26
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=86b00e0da6be7bbc16412f126c5b548ac5d91d50;p=pandora-kernel.git

rbd: get parent spec for version 2 images

Add support for getting the the information identifying the parent
image for rbd images that have them.  The child image holds a
reference to its parent image specification structure.  Create a new
entry "parent" in /sys/bus/rbd/image/N/ to report the identifying
information for the parent image, if any.

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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