libceph: generalize ceph_pg_mapping

In preparation for adding support for primary_temp mappings, generalize
struct ceph_pg_mapping so it can hold mappings other than pg_temp.

Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Alex Elder <elder@linaro.org>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 46c3e304c3d8..4837e58e3203 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -60,8 +60,13 @@ struct ceph_object_id {
 struct ceph_pg_mapping {
         struct rb_node node;
         struct ceph_pg pgid;
-        int len;
-        int osds[];
+
+        union {
+                struct {
+                        int len;
+                        int osds[];
+                } pg_temp;
+        };
 };
 
 struct ceph_osdmap {