osd: simplify init of fabricated pg

This was similar (but different) to the logic in PG::merge_from().  Do not
do any initialization here, and instead rely on merge_from() to do the
right thing.

Signed-off-by: Sage Weil <sage@redhat.com>

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 596c23c0ee29e8908ed18fb5beeb142b94b233f2..56530a0cf994f24f87e034ccea500769fce1ab8f 100644 (file)
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -10131,20 +10131,8 @@ void OSDShard::prime_merges(const OSDMapRef& as_of_osdmap,
     } else {
       dout(20) << __func__ << "  creating empty merge participant " << pgid
               << " for merge in " << epoch << dendl;
-      // Construct a history with a single previous interval,
-      // going back to the epoch *before* pg_num_pending was
-      // adjusted (since we are creating the PG as it would have
-      // existed just before the merge). We know that the PG was
-      // clean as of that epoch or else pg_num_pending wouldn't
-      // have been adjusted.
+      // leave history zeroed; PG::merge_from() will fill it in.
       pg_history_t history;
-      history.same_interval_since = epoch - 1;
-      // leave these zeroed since we do not know the precist
-      // last_epoch_started value that the real PG instances have.  If
-      // we are greater than they are, we will trigger an 'incomplete'
-      // state (see choose_acting).
-      history.last_epoch_started = 0;
-      history.last_epoch_clean = 0;
       PGCreateInfo cinfo(pgid, epoch - 1,
                         history, PastIntervals(), false);
       PGRef pg = osd->handle_pg_create_info(shard_osdmap, &cinfo);