From: Alex Elder <elder@inktank.com>
Date: Fri, 19 Apr 2013 20:34:50 +0000 (-0500)
Subject: rbd: implement full object parent reads
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~26^2~74
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3d7efd18d9df628e30ff36e9e488a8f0e782b678;p=pandora-kernel.git

rbd: implement full object parent reads

As a step toward implementing layered writes, implement reading the
data for a target object from the parent image for a write request
whose target object is known to not exist.  Add a copyup_pages field
to an image request to track the page array used (only) for such a
request.

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