Add --bdb-data-direct and --bdb-log-direct server options. (Bug #14880)

sql/ha_berkeley.cc:
  Export DB_DIRECT_* constants
sql/ha_berkeley.h:
  Declare new constants
sql/mysqld.cc:
  Add bdb-data-direct and bdb-log-direct options

sql/ha_berkeley.cc

@@ -74,6 +74,8 @@
 const u_int32_t bdb_DB_TXN_NOSYNC= DB_TXN_NOSYNC;
 const u_int32_t bdb_DB_RECOVER= DB_RECOVER;
 const u_int32_t bdb_DB_PRIVATE= DB_PRIVATE;
+const u_int32_t bdb_DB_DIRECT_DB= DB_DIRECT_DB;
+const u_int32_t bdb_DB_DIRECT_LOG= DB_DIRECT_LOG;
 const char *ha_berkeley_ext=".db";
 bool berkeley_shared_data=0;
 u_int32_t berkeley_init_flags= DB_PRIVATE | DB_RECOVER, berkeley_env_flags=0,

sql/ha_berkeley.h

@@ -160,6 +160,8 @@ class ha_berkeley: public handler
 extern const u_int32_t bdb_DB_TXN_NOSYNC;
 extern const u_int32_t bdb_DB_RECOVER;
 extern const u_int32_t bdb_DB_PRIVATE;
+extern const u_int32_t bdb_DB_DIRECT_DB;
+extern const u_int32_t bdb_DB_DIRECT_LOG;
 extern bool berkeley_shared_data;
 extern u_int32_t berkeley_init_flags,berkeley_env_flags, berkeley_lock_type,
                  berkeley_lock_types[];

sql/mysqld.cc

@@ -390,7 +390,8 @@ extern ulong srv_commit_concurrency;
 }
 #endif
 #ifdef WITH_BERKELEY_STORAGE_ENGINE
-extern const u_int32_t bdb_DB_TXN_NOSYNC, bdb_DB_RECOVER, bdb_DB_PRIVATE;
+extern const u_int32_t bdb_DB_TXN_NOSYNC, bdb_DB_RECOVER, bdb_DB_PRIVATE,
+                       bdb_DB_DIRECT_DB, bdb_DB_DIRECT_LOG;
 extern bool berkeley_shared_data;
 extern u_int32_t berkeley_init_flags,berkeley_env_flags, berkeley_lock_type,
                  berkeley_lock_types[];
@@ -4470,6 +4471,7 @@ enum options_mysqld
   OPT_BDB_TMP,                 OPT_BDB_SYNC,
   OPT_BDB_LOCK,                OPT_BDB,
   OPT_BDB_NO_RECOVER,          OPT_BDB_SHARED,
+  OPT_BDB_DATA_DIRECT,         OPT_BDB_LOG_DIRECT,
   OPT_MASTER_HOST,             OPT_MASTER_USER,
   OPT_MASTER_PASSWORD,         OPT_MASTER_PORT,
   OPT_MASTER_INFO_FILE,        OPT_MASTER_CONNECT_RETRY,
@@ -4673,6 +4675,9 @@ Disable with --skip-bdb (will save memory).",
    (gptr*) &opt_bdb, (gptr*) &opt_bdb, 0, GET_BOOL, NO_ARG, OPT_BDB_DEFAULT, 0, 0,
    0, 0, 0},
 #ifdef WITH_BERKELEY_STORAGE_ENGINE
+  {"bdb-data-direct", OPT_BDB_DATA_DIRECT,
+   "Turn off system buffering of BDB database files to avoid double caching.",
+   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"bdb-home", OPT_BDB_HOME, "Berkeley home directory.", (gptr*) &berkeley_home,
    (gptr*) &berkeley_home, 0, GET_STR, REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
   {"bdb-lock-detect", OPT_BDB_LOCK,
@@ -4681,6 +4686,9 @@ Disable with --skip-bdb (will save memory).",
   {"bdb-logdir", OPT_BDB_LOG, "Berkeley DB log file directory.",
    (gptr*) &berkeley_logdir, (gptr*) &berkeley_logdir, 0, GET_STR,
    REQUIRED_ARG, 0, 0, 0, 0, 0, 0},
+  {"bdb-log-direct", OPT_BDB_LOG_DIRECT,
+   "Turn off system buffering of BDB log files to avoid double caching.",
+   0, 0, 0, GET_NO_ARG, NO_ARG, 0, 0, 0, 0, 0, 0},
   {"bdb-no-recover", OPT_BDB_NO_RECOVER,
    "Don't try to recover Berkeley DB tables on start.", 0, 0, 0, GET_NO_ARG,
    NO_ARG, 0, 0, 0, 0, 0, 0},
@@ -6837,6 +6845,12 @@ get_one_option(int optid, const struct my_option *opt __attribute__((unused)),
     else
       berkeley_env_flags&= ~bdb_DB_TXN_NOSYNC;
     break;
+  case OPT_BDB_LOG_DIRECT:
+    berkeley_env_flags|= bdb_DB_DIRECT_DB;
+    break;
+  case OPT_BDB_DATA_DIRECT:
+    berkeley_env_flags|= bdb_DB_DIRECT_LOG;
+    break;
   case OPT_BDB_NO_RECOVER:
     berkeley_init_flags&= ~(bdb_DB_RECOVER);
     break;