Addresses #2165 refs[t:2165] Test that env->dbremove() and env->dbrename()...

Addresses #2165 refs[t:2165] Test that env->dbremove() and env->dbrename() return correct error code when given a zombie db.

git-svn-id: file:///svn/toku/tokudb@15879 c7de825b-a66e-492c-adef-691d508d4ae1

src/tests/zombie_db.c

+/* -*- mode: C; c-basic-offset: 4 -*- */
+
+#ident "Copyright (c) 2009 Tokutek Inc.  All rights reserved."
+#ident "$Id$"
+
+/* Purpose of this test is to verify correct behavior of
+ * zombie dbs.  
+ *
+ * A db is destroyed when it is closed by the user and there are no txns using it.
+ * If a transaction creates a db and then closes, that leaves an open db with 
+ * no transaction associated with it.  If another transaction then uses the db,
+ * and then closes it, then that leaves a zombie db.  The db is closed, but 
+ * cannot be destroyed because there is still a transaction associated with it
+ * (not the transaction that created it).
+ *
+ * Outline of this test:
+ *
+ * begin txn_a
+ * create db for new dictionary "foo"
+ * commit txn_a
+ *  => leaves open db with no txn
+ *     (releases range lock on "foo" dname in directory)
+ * 
+ * begin txn_b
+ * insert into db
+ * close db
+ *   => leaves zombie db, held open by txn_b
+ * 
+ * 
+ * create txn_c
+ * 
+ * test1:
+ * try to delete dictionary (env->dbremove(foo)) 
+ *   should return DB_LOCK_NOT_GRANTED because txnB is holding range lock on some part of 
+ *   the dictionary ("foo") referred to by db
+ * 
+ * test2:
+ * try to rename dictionary (env->dbrename(foo->bar))
+ *   should return DB_LOCK_NOT_GRANTED because txnB is holding range lock on some part of 
+ *   the dictionary ("foo") referred to by db
+ * 
+ */
+
+#include "test.h"
+#include <db.h>
+
+static DB_ENV *env;
+static DB * db;
+
+static void
+setup (void) {
+    int r;
+    system("rm -rf " ENVDIR);
+    r=toku_os_mkdir(ENVDIR, S_IRWXU+S_IRWXG+S_IRWXO);       CKERR(r);
+
+    r=db_env_create(&env, 0); CKERR(r);
+    env->set_errfile(env, stderr);
+    r=env->open(env, ENVDIR, DB_INIT_LOCK|DB_INIT_LOG|DB_INIT_MPOOL|DB_INIT_TXN|DB_CREATE|DB_PRIVATE, S_IRWXU+S_IRWXG+S_IRWXO); CKERR(r);
+}
+
+
+
+static void
+test_shutdown(void) {
+    int r;
+    r=env->close(env, 0); CKERR(r);
+}
+
+static void
+test_zombie_db(void) {
+    int r;
+    DBT key, val;
+    DB_TXN * txn_b;
+
+    r=env->txn_begin(env, 0, &txn_b, 0); CKERR(r);
+
+    {
+	DB_TXN * txn_a;
+	dbt_init(&key, "key1", 4);
+	dbt_init(&val, "val1", 4);
+
+	r=env->txn_begin(env, 0, &txn_a, 0); CKERR(r);
+	r=db_create(&db, env, 0); CKERR(r);
+	r=db->open(db, txn_a, "foo.db", 0, DB_BTREE, DB_CREATE, S_IRWXU|S_IRWXG|S_IRWXO); CKERR(r);
+	r=db->put(db, txn_a, &key, &val, DB_YESOVERWRITE); CKERR(r);
+	r=txn_a->commit(txn_a, 0); CKERR(r);
+    }
+
+    // db is now open with no associated txn
+
+    {
+	dbt_init(&key, "key2", 4);
+	dbt_init(&val, "val2", 4);
+
+	r = db->put(db, txn_b, &key, &val, DB_YESOVERWRITE); CKERR(r);
+	r=db->close(db, 0); CKERR(r);
+    }
+    
+    // db is now closed, but cannot be destroyed until txn_b closes
+    // db is now a zombie
+
+    {
+	DB_TXN * txn_c;
+
+	r=env->txn_begin(env, 0, &txn_c, 0); CKERR(r);
+	r = env->dbremove(env, txn_c, "foo.db", NULL, 0);  
+	CKERR2(r, DB_LOCK_NOTGRANTED);
+	r = env->dbrename(env, txn_c, "foo.db", NULL, "bar.db", 0); 
+	CKERR2(r, DB_LOCK_NOTGRANTED);
+	r=txn_c->commit(txn_c, 0); CKERR(r);
+    }
+    
+    r=txn_b->commit(txn_b, 0); CKERR(r);
+    
+    // db should now be destroyed
+}
+
+int
+test_main (int argc, char *argv[]) {
+    parse_args(argc, argv);
+    setup();
+    test_zombie_db();
+    test_shutdown();
+    return 0;
+}