osd/: Integrate SnapMapper with OSD

- SnapTrimmer now uses SnapMapper to get the next object to trim
- Entries for a snap are implicitely removed from SnapMapper when
the last object is trimmed, so no need for the adjust_local_snaps
logic.
- Scrub now compares the object_info snaps set on the object attr
with the version stored in the SnapMapper.

Signed-off-by: Samuel Just <sam.just@inktank.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/src/osd/OSD.h b/src/osd/OSD.h
index 23d2537b745..1ee2750c444 100644
--- a/src/osd/OSD.h
+++ b/src/osd/OSD.h
@@ -465,6 +465,13 @@ public:
     return hobject_t(sobject_t(object_t(foo), 0)); 
   }
 
+  static hobject_t make_snapmapper_oid() {
+    return hobject_t(
+      sobject_t(
+	object_t("snapmapper"),
+	0));
+  }
+
   static hobject_t make_pg_log_oid(pg_t pg) {
     stringstream ss;
     ss << "pglog_" << pg;