From: Alex Elder <elder@inktank.com>
Date: Thu, 2 Aug 2012 16:29:46 +0000 (-0500)
Subject: rbd: separate reading header from decoding it
X-Git-Tag: v3.7-rc1~90^2~63
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4156d998409be065aa8141b6bd2c6f18be1b21e9;p=pandora-kernel.git

rbd: separate reading header from decoding it

Right now rbd_read_header() both reads the header object for an rbd
image and decodes its contents.  It does this repeatedly if needed,
in order to ensure a complete and intact header is obtained.

Separate this process into two steps--reading of the raw header
data (in new function, rbd_dev_v1_header_read()) and separately
decoding its contents (in rbd_header_from_disk()).  As a result,
the latter function no longer requires its allocated_snaps argument.

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