ceph/ceph — pull request #2852 by cmgitdream (2014-11-03 06:41:15+00:00)
Title: Wip copy on read both

cheng cheng,
I have rebased cm-cor-v3 and cchengleo/wip-copy-on-read branch's six commits ahead of the latest
ceph master branch. And you can add your new commits on this branch...
The first 3 commits is cmgitdream's original commits, and I suggest you add 4 stable commits (including the test case) finally.