qdevices/qdevice-net-cast-vote-timer.c

   1 /*
   2  * Copyright (c) 2015-2020 Red Hat, Inc.
   3  *
   4  * All rights reserved.
   5  *
   6  * Author: Jan Friesse (jfriesse@redhat.com)
   7  *
   8  * This software licensed under BSD license, the text of which follows:
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions are met:
  12  *
  13  * - Redistributions of source code must retain the above copyright notice,
  14  *   this list of conditions and the following disclaimer.
  15  * - Redistributions in binary form must reproduce the above copyright notice,
  16  *   this list of conditions and the following disclaimer in the documentation
  17  *   and/or other materials provided with the distribution.
  18  * - Neither the name of the Red Hat, Inc. nor the names of its
  19  *   contributors may be used to endorse or promote products derived from this
  20  *   software without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  23  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  26  * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  27  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  28  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  29  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  30  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  31  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  32  * THE POSSIBILITY OF SUCH DAMAGE.
  33  */
  34
  35 #include "log.h"
  36 #include "qnet-config.h"
  37 #include "qdevice-net-cast-vote-timer.h"
  38 #include "qdevice-votequorum.h"
  39
  40 static int
  41 qdevice_net_cast_vote_timer_callback(void *data1, void *data2)
  42 {
  43         struct qdevice_net_instance *instance;
  44         int cast_vote;
  45         int case_processed;
  46
  47         instance = (struct qdevice_net_instance *)data1;
  48
  49         if (instance->cast_vote_timer_paused) {
  50                 return (-1);
  51         }
  52
  53         case_processed = 0;
  54
  55         switch (instance->cast_vote_timer_vote) {
  56         case TLV_VOTE_ACK:
  57                 case_processed = 1;
  58                 cast_vote = 1;
  59                 break;
  60         case TLV_VOTE_NACK:
  61                 case_processed = 1;
  62                 cast_vote = 0;
  63                 break;
  64         case TLV_VOTE_ASK_LATER:
  65         case TLV_VOTE_WAIT_FOR_REPLY:
  66         case TLV_VOTE_NO_CHANGE:
  67         case TLV_VOTE_UNDEFINED:
  68                 /*
  69                  * Shouldn't happen
  70                  */
  71                 break;
  72         /*
  73          * Default is not defined intentionally. Compiler shows warning when
  74          * new tlv_vote is added.
  75          */
  76         }
  77
  78         if (!case_processed) {
  79                 log(LOG_CRIT, "qdevice_net_timer_cast_vote: Unhandled cast_vote_timer_vote %u\n",
  80                     instance->cast_vote_timer_vote);
  81                 exit(EXIT_FAILURE);
  82         }
  83
  84         if (qdevice_votequorum_poll(instance->qdevice_instance_ptr, cast_vote) != 0) {
  85                 instance->disconnect_reason = QDEVICE_NET_DISCONNECT_REASON_CANT_SCHEDULE_VOTING_TIMER;
  86                 instance->schedule_disconnect = 1;
  87                 instance->cast_vote_timer = NULL;
  88                 return (0);
  89         }
  90
  91         /*
  92          * Schedule this function callback again
  93          */
  94         return (-1);
  95 }
  96
  97 int
  98 qdevice_net_cast_vote_timer_update(struct qdevice_net_instance *instance, enum tlv_vote vote)
  99 {
 100         int timer_needs_running;
 101         int case_processed;
 102
 103         case_processed = 0;
 104
 105         switch (vote) {
 106         case TLV_VOTE_UNDEFINED:
 107                 break;
 108         case TLV_VOTE_ACK:
 109         case TLV_VOTE_NACK:
 110                 case_processed = 1;
 111                 timer_needs_running = 1;
 112                 break;
 113         case TLV_VOTE_WAIT_FOR_REPLY:
 114         case TLV_VOTE_ASK_LATER:
 115                 case_processed = 1;
 116                 timer_needs_running = 0;
 117                 break;
 118         case TLV_VOTE_NO_CHANGE:
 119                 case_processed = 1;
 120                 return (0);
 121
 122                 break;
 123         /*
 124          * Default is not defined intentionally. Compiler shows warning when
 125          * new tlv_vote is added.
 126          */
 127         }
 128
 129         if (!case_processed) {
 130                 log(LOG_CRIT, "qdevice_net_cast_vote_timer_update_vote: Unhandled vote parameter %u\n",
 131                     vote);
 132                 exit(EXIT_FAILURE);
 133         }
 134
 135         instance->cast_vote_timer_vote = vote;
 136
 137         if (timer_needs_running) {
 138                 if (instance->cast_vote_timer == NULL) {
 139                         instance->cast_vote_timer = timer_list_add(&instance->main_timer_list,
 140                             instance->cast_vote_timer_interval,
 141                             qdevice_net_cast_vote_timer_callback, (void *)instance, NULL);
 142
 143                         if (instance->cast_vote_timer == NULL) {
 144                                 log(LOG_ERR, "Can't schedule sending of "
 145                                     "votequorum poll");
 146
 147                                 return (-1);
 148                         } else {
 149                                 log(LOG_DEBUG, "Cast vote timer is now scheduled every "
 150                                     "%"PRIu32"ms voting %s.", instance->cast_vote_timer_interval,
 151                                     tlv_vote_to_str(instance->cast_vote_timer_vote));
 152                         }
 153                 } else {
 154                         log(LOG_DEBUG, "Cast vote timer remains scheduled every "
 155                             "%"PRIu32"ms voting %s.", instance->cast_vote_timer_interval,
 156                             tlv_vote_to_str(instance->cast_vote_timer_vote));
 157                 }
 158
 159                 if (qdevice_net_cast_vote_timer_callback((void *)instance, NULL) != -1) {
 160                         return (-1);
 161                 }
 162         } else {
 163                 if (instance->cast_vote_timer != NULL) {
 164                         timer_list_delete(&instance->main_timer_list, instance->cast_vote_timer);
 165                         instance->cast_vote_timer = NULL;
 166                         log(LOG_DEBUG, "Cast vote timer is now stopped.");
 167                 } else {
 168                         log(LOG_DEBUG, "Cast vote timer remains stopped.");
 169                 }
 170         }
 171
 172         return (0);
 173 }
 174
 175 void
 176 qdevice_net_cast_vote_timer_set_paused(struct qdevice_net_instance *instance, int paused)
 177 {
 178
 179         if (paused != instance->cast_vote_timer_paused) {
 180                 instance->cast_vote_timer_paused = paused;
 181
 182                 if (instance->cast_vote_timer_paused) {
 183                         log(LOG_DEBUG, "Cast vote timer is now paused.");
 184                 } else {
 185                         log(LOG_DEBUG, "Cast vote timer is no longer paused.");
 186                 }
 187         }
 188 }