Support a database-local fsync setting. Needs berkeley db patch.

--- ./lib/backend/db3.c.orig	2009-12-07 14:36:49.000000000 +0000
+++ ./lib/backend/db3.c	2010-03-25 14:35:39.000000000 +0000
@@ -62,10 +62,12 @@ static int db_fini(dbiIndex dbi, const c
     return rc;
 }
 
+#if 0
 static int db3_fsync_disable(int fd)
 {
     return 0;
 }
+#endif
 
 #if (DB_VERSION_MAJOR >= 4 && DB_VERSION_MINOR >= 5)
 /*
@@ -168,10 +170,12 @@ static int db_init(dbiIndex dbi, const c
 	xx = cvtdberr(dbi, "dbenv->set_cachesize", xx, _debug);
     }
 
+#if 0
     if (dbi->dbi_no_fsync) {
 	xx = db_env_set_func_fsync(db3_fsync_disable);
 	xx = cvtdberr(dbi, "db_env_set_func_fsync", xx, _debug);
     }
+#endif
 
     if (dbi->dbi_shmkey) {
 	xx = dbenv->set_shm_key(dbenv, dbi->dbi_shmkey);
--- ./lib/backend/dbconfig.c.orig	2009-12-07 14:36:49.000000000 +0000
+++ ./lib/backend/dbconfig.c	2010-03-25 14:35:39.000000000 +0000
@@ -72,6 +72,8 @@ static const struct poptOption rdbOption
 	NULL, NULL },
  { "fcntl_locking",0,POPT_BIT_SET,	&db3dbi.dbi_oflags, DB_FCNTL_LOCKING,
 	NULL, NULL },
+ { "nofsync",	0,POPT_BIT_SET,		&db3dbi.dbi_oflags, DB_NOFSYNC,
+	NULL, NULL },
 
  { "btree",	0,POPT_ARG_VAL,		&db3dbi.dbi_type, DB_BTREE,
 	NULL, NULL },
@@ -101,8 +103,6 @@ static const struct poptOption rdbOption
 	NULL, NULL },
  { "usedbenv",	0,POPT_ARG_NONE,	&db3dbi.dbi_use_dbenv, 0,
 	NULL, NULL },
- { "nofsync",	0,POPT_ARG_NONE,	&db3dbi.dbi_no_fsync, 0,
-	NULL, NULL },
  { "nodbsync",	0,POPT_ARG_NONE,	&db3dbi.dbi_no_dbsync, 0,
 	NULL, NULL },
  { "lockdbfd",	0,POPT_ARG_NONE,	&db3dbi.dbi_lockdbfd, 0,