From: Alex Elder <elder@inktank.com>
Date: Mon, 6 May 2013 22:40:33 +0000 (-0500)
Subject: rbd: support reading parent page data
X-Git-Tag: v3.10-rc2~28^2~16
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b2ab72d367d2682c1a237448fbc1595881a88fa;p=pandora-kernel.git

rbd: support reading parent page data

Currently, rbd_img_parent_read() assumes the incoming object request
contains bio data.  But if a layered image is part of a multi-layer
stack of images it will result in read requests of page data to parent
images.

Fortunately, it's not hard to add support for page data.

This resolves:
    http://tracker.ceph.com/issues/4939

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