From: Robin Geuze <robing@transip.nl>
Date: Thu, 17 Dec 2020 10:51:24 +0000 (+0100)
Subject: Do a mdb_readers_check to clean up stale readers on database load
X-Git-Tag: rec-4.5.0-alpha1~9^2
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=refs%2Fpull%2F9888%2Fhead;p=thirdparty%2Fpdns.git

Do a mdb_readers_check to clean up stale readers on database load
---

diff --git a/ext/lmdb-safe/lmdb-safe.cc b/ext/lmdb-safe/lmdb-safe.cc
index ccb090127a..7b968e20d6 100644
--- a/ext/lmdb-safe/lmdb-safe.cc
+++ b/ext/lmdb-safe/lmdb-safe.cc
@@ -46,6 +46,12 @@ Various other options may also need to be set before opening the handle, e.g. md
     mdb_env_close(d_env);
     throw std::runtime_error("Unable to open database file "+std::string(fname)+": " + MDBError(rc));
   }
+
+  if ((flags & MDB_RDONLY) == 0) {
+    // Check for stale readers to prevent unbridled database growth.
+    // Only do this when in RW mode since it affects the file.
+    mdb_reader_check(d_env, nullptr);
+  }
 }
 
 void MDBEnv::incROTX()