osd: an interval can't go readwrite if its acting is empty

Let's not forget that min_size can be zero.

Fixes: #4159
Signed-off-by: Sage Weil <sage@inktank.com>
(cherry picked from commit 4277265d99647c9fe950ba627e5d86234cfd70a9)

diff --git a/src/osd/osd_types.cc b/src/osd/osd_types.cc
index c3827a4680b93f9acae7c9c025d5be9a2d803a5d..135f1fb3130a5e0a173c7e7ddec70e309ba21b07 100644 (file)
--- a/src/osd/osd_types.cc
+++ b/src/osd/osd_types.cc
@@ -1597,7 +1597,8 @@ bool pg_interval_t::check_new_interval(
     i.acting = old_acting;
     i.up = old_up;
 
-    if (i.acting.size() >=
+    if (!i.acting.empty() &&
+       i.acting.size() >=
        osdmap->get_pools().find(pool_id)->second.min_size) {
       if (lastmap->get_up_thru(i.acting[0]) >= i.first &&
          lastmap->get_up_from(i.acting[0]) <= i.first) {