1 files changed, 63 insertions, 0 deletions
diff --git a/ctdb/server/ipalloc_deterministic.c b/ctdb/server/ipalloc_deterministic.c
new file mode 100644
index 0000000..097d816
--- /dev/null
+++ b/ctdb/server/ipalloc_deterministic.c
@@ -0,0 +1,63 @@
+/*
+   ctdb ip takeover code
+
+   Copyright (C) Ronnie Sahlberg  2007
+   Copyright (C) Andrew Tridgell  2007
+   Copyright (C) Martin Schwenke  2011
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "replace.h"
+#include "system/network.h"
+
+#include "lib/util/debug.h"
+#include "common/logging.h"
+
+#include "server/ipalloc_private.h"
+
+bool ipalloc_deterministic(struct ipalloc_state *ipalloc_state)
+{
+	struct public_ip_list *t;
+	int i, numnodes;
+
+	numnodes = ipalloc_state->num;
+
+	DEBUG(DEBUG_NOTICE,("Deterministic IPs enabled. Resetting all ip allocations\n"));
+       /* Allocate IPs to nodes in a modulo fashion so that IPs will
+        *  always be allocated the same way for a specific set of
+        *  available/unavailable nodes.
+	*/
+
+	for (i = 0, t = ipalloc_state->all_ips; t!= NULL; t = t->next, i++) {
+		t->pnn = i % numnodes;
+	}
+
+	/* IP failback doesn't make sense with deterministic
+	 * IPs, since the modulo step above implicitly fails
+	 * back IPs to their "home" node.
+	 */
+	if (ipalloc_state->no_ip_failback) {
+		D_WARNING("WARNING: 'NoIPFailback' set but ignored - "
+			  "incompatible with 'Deterministic IPs\n");
+	}
+
+	unassign_unsuitable_ips(ipalloc_state);
+
+	basic_allocate_unassigned(ipalloc_state);
+
+	/* No failback here! */
+
+	return true;
+}