From: Alex Elder <elder@inktank.com>
Date: Tue, 30 Apr 2013 05:44:33 +0000 (-0500)
Subject: rbd: use snap_id not index to look up snap info
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~26^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=54cac61fb6b3bacecf5367d3838307b1dd69ace2;p=pandora-kernel.git

rbd: use snap_id not index to look up snap info

In order to align with what was needed for format 1 rbd images,
rbd_dev_v2_snap_info() was set up to take as argument an index into
the array of snapshot ids in a rbd device's snapshot context.

This switches that around, so we pass the snapshot id instead.
In doing this, rbd_snap_name() now returns a dynamically-allocated
string rather than a fixed one, so there's no need to make a
duplicate in its caller, rbd_dev_spec_update().

This means the following functions take a snapshot id where they
previously used an index value:
    rbd_dev_snap_info()
    rbd_dev_v1_snap_info()
    rbd_dev_v2_snap_info()

A new function, rbd_dev_snap_index(), determines the snap index for
format 1 images and uses it to look up the name.

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