PGMap: remove pool max_avail scale factor

The scaling of max_avail by the ratio of non-degraded to total objects
count results in the reported max_avail increasing proportionally to the
number of OSDs marked `down` but not `out`.  This is counter intuitive
since OSDs going `down` should never result in more space being
available.

Removing the scale factor allows max_avail to remain unchanged until the
OSDs are marked `out`.

Signed-off-by: Michael J. Kidd <[email protected]>

Author: linuxkidd

src/mon/PGMap.cc

@@ -882,10 +882,6 @@ void PGMapDigest::dump_object_stat_sum(
   const object_stat_sum_t &sum = pool_stat.stats.sum;
   const store_statfs_t statfs = pool_stat.store_stats;
 
-  if (sum.num_object_copies > 0) {
-    raw_used_rate *= (float)(sum.num_object_copies - sum.num_objects_degraded) / sum.num_object_copies;
-  }
-
   uint64_t used_data_bytes = pool_stat.get_allocated_data_bytes(per_pool);
   uint64_t used_omap_bytes = pool_stat.get_allocated_omap_bytes(per_pool_omap);
   uint64_t used_bytes = used_data_bytes + used_omap_bytes;

src/test/mon/PGMap.cc

@@ -83,23 +83,20 @@ TEST(pgmap, dump_object_stat_sum_0)
   pool.tier_of = 0;
   PGMap::dump_object_stat_sum(tbl, nullptr, pool_stat, avail,
 			      pool.get_size(), verbose, true, true, &pool);
-  float copies_rate =
-    (static_cast<float>(sum.num_object_copies - sum.num_objects_degraded) /
-      sum.num_object_copies) * pool.get_size();
+
   float used_percent = (float)statfs.allocated /
     (statfs.allocated + avail) * 100;
-  uint64_t stored = statfs.data_stored / copies_rate;
 
   unsigned col = 0;
-  ASSERT_EQ(stringify(byte_u_t(stored)), tbl.get(0, col++));
-  ASSERT_EQ(stringify(byte_u_t(stored)), tbl.get(0, col++));
+  ASSERT_EQ(stringify(byte_u_t(statfs.data_stored/pool.get_size())), tbl.get(0, col++));
+  ASSERT_EQ(stringify(byte_u_t(statfs.data_stored/pool.get_size())), tbl.get(0, col++));
   ASSERT_EQ(stringify(byte_u_t(0)), tbl.get(0, col++));
   ASSERT_EQ(stringify(si_u_t(sum.num_objects)), tbl.get(0, col++));
   ASSERT_EQ(stringify(byte_u_t(statfs.allocated)), tbl.get(0, col++));
   ASSERT_EQ(stringify(byte_u_t(statfs.allocated)), tbl.get(0, col++));
   ASSERT_EQ(stringify(byte_u_t(0)), tbl.get(0, col++));
   ASSERT_EQ(percentify(used_percent), tbl.get(0, col++));
-  ASSERT_EQ(stringify(byte_u_t(avail/copies_rate)), tbl.get(0, col++));
+  ASSERT_EQ(stringify(byte_u_t(avail/pool.get_size())), tbl.get(0, col++));
   ASSERT_EQ(stringify(si_u_t(pool.quota_max_objects)), tbl.get(0, col++));
   ASSERT_EQ(stringify(byte_u_t(pool.quota_max_bytes)), tbl.get(0, col++));
   ASSERT_EQ(stringify(si_u_t(sum.num_objects_dirty)), tbl.get(0, col++));