rbd: get parent spec for version 2 images
Add support for getting the the information identifying the parent
image for rbd images that have them. The child image holds a
reference to its parent image specification structure. Create a new
entry "parent" in /sys/bus/rbd/image/N/ to report the identifying
information for the parent image, if any.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
diff --git a/include/linux/ceph/rados.h b/include/linux/ceph/rados.h
index 0a99099..15077db 100644
--- a/include/linux/ceph/rados.h
+++ b/include/linux/ceph/rados.h
@@ -87,6 +87,8 @@
*
* lpgp_num -- as above.
*/
+#define CEPH_NOPOOL ((__u64) (-1)) /* pool id not defined */
+
#define CEPH_PG_TYPE_REP 1
#define CEPH_PG_TYPE_RAID4 2
#define CEPH_PG_POOL_VERSION 2