tree 769239813e121ed6191ca8d3db3dd8d23ec76f4d
parent 34b131849feb359f183907b467e9aa4d652b1baa
author Alex Elder <elder@inktank.com> 1341349279 -0500
committer Alex Elder <elder@inktank.com> 1349119853 -0500

rbd: encapsulate code that gets snapshot info

Create a function that encapsulates looking up the name, size and
features related to a given snapshot, which is indicated by its
index in an rbd device's snapshot context array of snapshot ids.

This interface will be used to hide differences between the format 1
and format 2 images.

At the moment this (looking up the name anyway) is slightly less
efficient than what's done currently, but we may be able to optimize
this a bit later on by cacheing the last lookup if it proves to be a
problem.

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