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Fix: avoid direct reference to meta pages

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Relevant info should be copied during txn_begin only.
This commit is contained in:
Howard Chu 2012-07-06 17:38:03 -07:00
parent df7ddb6bf4
commit 433105f09b
1 changed files with 2 additions and 2 deletions
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4
libraries/libmdb/mdb.c
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@ -1608,9 +1608,9 @@ mdb_txn_renew0(MDB_txn *txn)
txn->mt_u.dirty_list[0].mid = 0;
txn->mt_free_pgs = env->me_free_pgs;
txn->mt_free_pgs[0] = 0;
txn->mt_next_pgno = env->me_metas[txn->mt_toggle]->mm_last_pg+1;
env->me_txn = txn;
}
txn->mt_next_pgno = env->me_metas[txn->mt_toggle]->mm_last_pg+1;
/* Copy the DB arrays */
LAZY_RWLOCK_RDLOCK(&env->me_dblock);
@ -3380,7 +3380,7 @@ mdb_page_get(MDB_txn *txn, pgno_t pgno, MDB_page **ret)
}
}
if (!p) {
if (pgno <= txn->mt_env->me_metas[txn->mt_toggle]->mm_last_pg)
if (pgno < txn->mt_next_pgno)
p = (MDB_page *)(txn->mt_env->me_map + txn->mt_env->me_psize * pgno);
}
*ret = p;