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/*
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;
}
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