Compacting copy doesn't need to snapshot metas

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index bdc11b5a091e8083966179afb633e8b4d58d923d..e0465d4795dc57970030b34cf7a55152ee9992b1 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -8338,29 +8338,12 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
        my.mc_toggle = 0;
        my.mc_env = env;
        my.mc_fd = fd;
+       THREAD_CREATE(thr, mdb_env_copythr, &my);
 
-       /* Do the lock/unlock of the reader mutex before starting the
-        * write txn.  Otherwise other read txns could block writers.
-        */
        rc = mdb_txn_begin(env, NULL, MDB_RDONLY, &txn);
        if (rc)
                return rc;
 
-       if (env->me_txns) {
-               /* We must start the actual read txn after blocking writers */
-               mdb_txn_reset0(txn, "reset-stage1");
-
-               /* Temporarily block writers until we snapshot the meta pages */
-               LOCK_MUTEX_W(env);
-
-               rc = mdb_txn_renew0(txn);
-               if (rc) {
-                       UNLOCK_MUTEX_W(env);
-                       goto leave;
-               }
-       }
-
-       THREAD_CREATE(thr, mdb_env_copythr, &my);
        mp = (MDB_page *)my.mc_wbuf[0];
        memset(mp, 0, 2*env->me_psize);
        mp->mp_pgno = 0;
@@ -8410,7 +8393,7 @@ mdb_env_copyfd1(MDB_env *env, HANDLE fd)
                pthread_cond_wait(&my.mc_cond, &my.mc_mutex);
        pthread_mutex_unlock(&my.mc_mutex);
        THREAD_FINISH(thr);
-leave:
+
        mdb_txn_abort(txn);
 #ifdef _WIN32
        CloseHandle(my.mc_cond);