From 0903e875caa93e1fb231dd66c69b118dbdad25cb Mon Sep 17 00:00:00 2001
From: Alex Elder <elder@inktank.com>
Date: Wed, 14 Nov 2012 12:25:19 -0600
Subject: [PATCH] rbd: use a common layout for each device

Each osd message includes a layout structure, and for rbd it is
always the same (at least for osd's in a given pool).

Initialize a layout structure when an rbd_dev gets created and just
copy that into osd requests for the rbd image.

Replace an assertion that was done when initializing the layout
structures with code that catches and handles anything that would
trigger the assertion as soon as it is identified.  This precludes
that (bad) condition from ever occurring.

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