# ceph -v
ceph version 0.53 (commit:2528b5ee105b16352c91af064af5c0b5a7d45d7c)

# rbd snap protect precise-master@test
# rbd clone precise-master@test precise-clone
# rbd children precise-master@test
rbd/precise-clone
# rbd info precise-clone
rbd image 'precise-clone':
	size 10240 MB in 2560 objects
	order 22 (4096 KB objects)
	block_name_prefix: rbd_data.105d6c904572
	format: 2
	features: layering
	parent: rbd/precise-master@test
	overlap: 10240 MB
# rbd snap unprotect precise-master@test
# rbd info precise-clone
rbd image 'precise-clone':
	size 10240 MB in 2560 objects
	order 22 (4096 KB objects)
	block_name_prefix: rbd_data.105d6c904572
	format: 2
	features: layering
	parent: rbd/precise-master@test
	overlap: 10240 MB
# rbd snap rm precise-master@test
# rbd info precise-clone
error opening image precise-clone: (2) No such file or directory2012-11-09 12:49:37.375025 7f5f68e6f780 -1 librbd: parent snapshot does not exist

2012-11-09 12:49:37.375047 7f5f68e6f780 -1 librbd: error opening parent snapshot: (2) No such file or directory