# v0.51

08/05/2012



* Feature #2559: cls_rbd: copyup method
* Feature #2561: rbd: copyup command
* Feature #2562: librbd: open parent images, read path, write path
* Subtask #2603: librbd layering: open parent on open
* Subtask #2604: librbd layering: read path
* Subtask #2605: librbd layering: guard writes
* Subtask #2606: librbd layering: copyup on missing child object
* Feature #2607: librbd: copyup helper
* Documentation #2670: Docs shouldn't direct users to echo to /sys/bus/rbd for normal use
* Feature #2717: cls_rbd: add methods for maintaining mapping from parent to child images
* Feature #2718: librbd: map parent -> child in a per-pool rbd_children object when cloning
* Feature #2722: cls_rbd: add class methods to get/set protected status
* Feature #2723: librbd: protect/unprotect as appropiate during cloning
* Feature #2850: libceph: support multi-operation transactions
* Bug #2937: btrfs filesystem on rbd device kernel BUG writing large file