From 18caa1cd8f084d1e6c8e8edb3b9db98c88e8d7a0 Mon Sep 17 00:00:00 2001
From: Samuel Just <sam.just@inktank.com>
Date: Mon, 7 Apr 2014 16:37:46 -0700
Subject: [PATCH] OSD: split pg stats during pg split

Fixes: #8020
Signed-off-by: Samuel Just <sam.just@inktank.com>
---
 src/osd/OSD.cc      | 11 ++++++++++-
 src/osd/osd_types.h | 32 ++++++++++++++++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/src/osd/OSD.cc b/src/osd/OSD.cc
index 986eef51b6e19..69faf9a315c2a 100644
--- a/src/osd/OSD.cc
+++ b/src/osd/OSD.cc
@@ -6160,9 +6160,15 @@ void OSD::split_pgs(
   parent->update_snap_mapper_bits(
     parent->info.pgid.get_split_bits(pg_num)
     );
+
+  vector<object_stat_sum_t> updated_stats(childpgids.size() + 1);
+  parent->info.stats.stats.sum.split(updated_stats);
+
+  vector<object_stat_sum_t>::iterator stat_iter = updated_stats.begin();
   for (set<spg_t>::const_iterator i = childpgids.begin();
        i != childpgids.end();
-       ++i) {
+       ++i, ++stat_iter) {
+    assert(stat_iter != updated_stats.end());
     dout(10) << "Splitting " << *parent << " into " << *i << dendl;
     assert(service.splitting(*i));
     PG* child = _make_pg(nextmap, *i);
@@ -6183,10 +6189,13 @@ void OSD::split_pgs(
       i->pgid,
       child,
       split_bits);
+    child->info.stats.stats.sum = *stat_iter;
 
     child->write_if_dirty(*(rctx->transaction));
     child->unlock();
   }
+  assert(stat_iter != updated_stats.end());
+  parent->info.stats.stats.sum = *stat_iter;
   parent->write_if_dirty(*(rctx->transaction));
 }
   
diff --git a/src/osd/osd_types.h b/src/osd/osd_types.h
index 95ffadfc2f5af..4154d42fcfba8 100644
--- a/src/osd/osd_types.h
+++ b/src/osd/osd_types.h
@@ -1166,6 +1166,38 @@ struct object_stat_sum_t {
 #undef FLOOR
   }
 
+  void split(vector<object_stat_sum_t> &out) const {
+#define SPLIT(PARAM)                            \
+    for (unsigned i = 0; i < out.size(); ++i) { \
+      out[i].PARAM = PARAM / out.size();        \
+      if (i < (PARAM % out.size())) {           \
+	out[i].PARAM++;                         \
+      }                                         \
+    }                                           \
+
+    SPLIT(num_bytes);
+    SPLIT(num_objects);
+    SPLIT(num_object_clones);
+    SPLIT(num_object_copies);
+    SPLIT(num_objects_missing_on_primary);
+    SPLIT(num_objects_degraded);
+    SPLIT(num_objects_unfound);
+    SPLIT(num_rd);
+    SPLIT(num_rd_kb);
+    SPLIT(num_wr);
+    SPLIT(num_wr_kb);
+    SPLIT(num_scrub_errors);
+    SPLIT(num_shallow_scrub_errors);
+    SPLIT(num_deep_scrub_errors);
+    SPLIT(num_objects_recovered);
+    SPLIT(num_bytes_recovered);
+    SPLIT(num_keys_recovered);
+    SPLIT(num_objects_dirty);
+    SPLIT(num_whiteouts);
+    SPLIT(num_objects_omap);
+#undef SPLIT
+  }
+
   void clear() {
     memset(this, 0, sizeof(*this));
   }
-- 
2.39.5