ITS#7961 fix txn init

More fallout from 4d02c741b120786df1b87ee9ed49c1d3f9bc7522

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 63445ce7af2f9ed55a6c7756edf4a1492a49a0f1..524dde96d6367e06ed669a9a7c1a0f2e307d88ae 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -2472,11 +2472,10 @@ mdb_txn_renew0(MDB_txn *txn)
        uint16_t x;
        int rc, new_notls = 0;
 
-       /* Setup db info */
-       txn->mt_numdbs = env->me_numdbs;
-       txn->mt_dbxs = env->me_dbxs;    /* mostly static anyway */
-
        if (txn->mt_flags & MDB_TXN_RDONLY) {
+               /* Setup db info */
+               txn->mt_numdbs = env->me_numdbs;
+               txn->mt_dbxs = env->me_dbxs;    /* mostly static anyway */
                if (!ti) {
                        meta = env->me_metas[ mdb_env_pick_meta(env) ];
                        txn->mt_txnid = meta->mm_txnid;
@@ -2536,6 +2535,8 @@ mdb_txn_renew0(MDB_txn *txn)
                        meta = env->me_metas[ mdb_env_pick_meta(env) ];
                        txn->mt_txnid = meta->mm_txnid;
                }
+               /* Setup db info */
+               txn->mt_numdbs = env->me_numdbs;
                txn->mt_txnid++;
 #if MDB_DEBUG
                if (txn->mt_txnid == mdb_debug_start)
@@ -2622,18 +2623,17 @@ mdb_txn_begin(MDB_env *env, MDB_txn *parent, unsigned int flags, MDB_txn **ret)
                }
                tsize = sizeof(MDB_ntxn);
        }
-       size = tsize + env->me_maxdbs * (sizeof(MDB_db)+1);
+       size = tsize;
        if (!(flags & MDB_RDONLY)) {
                if (!parent) {
-                       txn = env->me_txn0;
+                       txn = env->me_txn0;     /* just reuse preallocated write txn */
                        txn->mt_flags = 0;
                        goto ok;
                }
+               /* child txns use own copy of cursors */
                size += env->me_maxdbs * sizeof(MDB_cursor *);
-               /* child txns use parent's dbiseqs */
-               if (!parent)
-                       size += env->me_maxdbs * sizeof(unsigned int);
        }
+       size += env->me_maxdbs * (sizeof(MDB_db)+1);
 
        if ((txn = calloc(1, size)) == NULL) {
                DPRINTF(("calloc: %s", strerror(errno)));
@@ -4530,6 +4530,7 @@ mdb_env_open(MDB_env *env, const char *path, unsigned int flags, mdb_mode_t mode
                                txn->mt_dbiseqs = (unsigned int *)(txn->mt_cursors + env->me_maxdbs);
                                txn->mt_dbflags = (unsigned char *)(txn->mt_dbiseqs + env->me_maxdbs);
                                txn->mt_env = env;
+                               txn->mt_dbxs = env->me_dbxs;
                                env->me_txn0 = txn;
                        } else {
                                rc = ENOMEM;