From: Alex Elder <elder@inktank.com>
Date: Wed, 11 Jul 2012 01:30:11 +0000 (-0500)
Subject: rbd: define rbd_dev_image_id()
X-Git-Tag: v3.7-rc1~90^2~18
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=589d30e0b3e649e2660f9a67be88e235b28bc319;p=pandora-kernel.git

rbd: define rbd_dev_image_id()

New format 2 rbd images are permanently identified by a unique image
id.  Each rbd image also has a name, but the name can be changed.
A format 2 rbd image will have an object--whose name is based on the
image name--which maps an image's name to its image id.

Create a new function rbd_dev_image_id() that checks for the
existence of the image id object, and if it's found, records the
image id in the rbd_device structure.

Create a new rbd device attribute (/sys/bus/rbd/<num>/image_id) that
makes this information available.

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