osd/OSDMap: add pg-existence sanity check

The reason why __get_pg_pool_size(pg)__ or __get_pg_pool_crush_rule(pg)__ fails is
that the pg does not exist anymore. So it generally makes sense to check __pg_exists(pg)__
before moving further.

Signed-off-by: xie xingguo <xie.xingguo@zte.com.cn>
(cherry picked from commit 79ef3bea7550559b7ea4e2b68dc407c7eb25defa)

Conflicts:
	- *nextmap* has been renamed to *tmpmap*

diff --git a/src/osd/OSDMap.cc b/src/osd/OSDMap.cc
index ea2f6dc61bf1213b4e3d21b6adbdc4565584690a..d71b0e1916145e06858ef1ec7e418fb7aa29d5f0 100644 (file)
--- a/src/osd/OSDMap.cc
+++ b/src/osd/OSDMap.cc
@@ -1663,12 +1663,12 @@ void OSDMap::maybe_remove_pg_upmaps(CephContext *cct,
     to_check.insert(p.first);
   }
   for (auto& pg : to_check) {
-    auto crush_rule = tmpmap.get_pg_pool_crush_rule(pg);
-    if (crush_rule < 0) {
-      lderr(cct) << __func__ << " unable to load crush-rule of pg "
-                 << pg << dendl;
+    if (!tmpmap.pg_exists(pg)) {
+      ldout(cct, 0) << __func__ << " pg " << pg << " is gone" << dendl;
+      to_cancel.insert(pg);
       continue;
     }
+    auto crush_rule = tmpmap.get_pg_pool_crush_rule(pg);
     map<int, float> weight_map;
     auto it = rule_weight_map.find(crush_rule);
     if (it == rule_weight_map.end()) {