From: Alex Elder <elder@inktank.com>
Date: Fri, 19 Apr 2013 20:34:50 +0000 (-0500)
Subject: rbd: support page array image requests
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~26^2~76
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f1a4739f333b519fe041e1ad81d9b31c94b9d6a3;p=pandora-kernel.git

rbd: support page array image requests

This patch adds the ability to build an image request whose data
will be written from or read into memory described by a page array.
(Previously only bio lists were supported.)

Originally this was going to define a new function for this purpose
but it was largely identical to the rbd_img_request_fill_bio().  So
instead, rbd_img_request_fill_bio() has been generalized to handle
both types of image request.

For the moment we still only fill image requests with bio data.

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