ctdb/server/ctdb_banning.c

   1 /*
   2    ctdb banning code
   3
   4    Copyright (C) Ronnie Sahlberg  2009
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #include "includes.h"
  20 #include "tdb.h"
  21 #include "system/time.h"
  22 #include "system/network.h"
  23 #include "system/filesys.h"
  24 #include "system/wait.h"
  25 #include "../include/ctdb_client.h"
  26 #include "../include/ctdb_private.h"
  27
  28
  29 static void
  30 ctdb_ban_node_event(struct event_context *ev, struct timed_event *te,
  31                                struct timeval t, void *private_data)
  32 {
  33         struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
  34         bool freeze_failed = false;
  35         int i;
  36
  37         /* Make sure we were able to freeze databases during banning */
  38         for (i=1; i<=NUM_DB_PRIORITIES; i++) {
  39                 if (ctdb->freeze_mode[i] != CTDB_FREEZE_FROZEN) {
  40                         freeze_failed = true;
  41                         break;
  42                 }
  43         }
  44         if (freeze_failed) {
  45                 DEBUG(DEBUG_ERR, ("Banning timedout, but still unable to freeze databases\n"));
  46                 ctdb_ban_self(ctdb);
  47                 return;
  48         }
  49
  50         DEBUG(DEBUG_ERR,("Banning timedout\n"));
  51         ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_BANNED;
  52
  53         if (ctdb->banning_ctx != NULL) {
  54                 talloc_free(ctdb->banning_ctx);
  55                 ctdb->banning_ctx = NULL;
  56         }
  57 }
  58
  59 void ctdb_local_node_got_banned(struct ctdb_context *ctdb)
  60 {
  61         uint32_t i;
  62
  63         /* make sure we are frozen */
  64         DEBUG(DEBUG_NOTICE,("This node has been banned - forcing freeze and recovery\n"));
  65
  66         /* Reset the generation id to 1 to make us ignore any
  67            REQ/REPLY CALL/DMASTER someone sends to us.
  68            We are now banned so we shouldnt service database calls
  69            anymore.
  70         */
  71         ctdb->vnn_map->generation = INVALID_GENERATION;
  72
  73         ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
  74         for (i=1; i<=NUM_DB_PRIORITIES; i++) {
  75                 ctdb_start_freeze(ctdb, i);
  76         }
  77         ctdb_release_all_ips(ctdb);
  78 }
  79
  80 int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata)
  81 {
  82         struct ctdb_ban_time *bantime = (struct ctdb_ban_time *)indata.dptr;
  83         bool already_banned;
  84
  85         DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
  86
  87         if (bantime->pnn != ctdb->pnn) {
  88                 if (bantime->pnn >= ctdb->num_nodes) {
  89                         DEBUG(DEBUG_ERR,(__location__ " ERROR: Invalid ban request. PNN:%d is invalid. Max nodes %d\n", bantime->pnn, ctdb->num_nodes));
  90                         return -1;
  91                 }
  92                 if (bantime->time == 0) {
  93                         DEBUG(DEBUG_NOTICE,("unbanning node %d\n", bantime->pnn));
  94                         ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
  95                 } else {
  96                         DEBUG(DEBUG_NOTICE,("banning node %d\n", bantime->pnn));
  97                         if (ctdb->tunable.enable_bans == 0) {
  98                                 /* FIXME: This is bogus. We really should be
  99                                  * taking decision based on the tunables on
 100                                  * the banned node and not local node.
 101                                  */
 102                                 DEBUG(DEBUG_WARNING,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 103                                 return 0;
 104                         }
 105
 106                         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 107                 }
 108                 return 0;
 109         }
 110
 111         already_banned = false;
 112         if (ctdb->banning_ctx != NULL) {
 113                 talloc_free(ctdb->banning_ctx);
 114                 ctdb->banning_ctx = NULL;
 115                 already_banned = true;
 116         }
 117
 118         if (bantime->time == 0) {
 119                 DEBUG(DEBUG_ERR,("Unbanning this node\n"));
 120                 ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
 121                 return 0;
 122         }
 123
 124         if (ctdb->tunable.enable_bans == 0) {
 125                 DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 126                 return 0;
 127         }
 128
 129         ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_time);
 130         if (ctdb->banning_ctx == NULL) {
 131                 DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
 132                 return -1;
 133         }
 134         *((struct ctdb_ban_time *)(ctdb->banning_ctx)) = *bantime;
 135
 136
 137         DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
 138         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 139
 140         event_add_timed(ctdb->ev, ctdb->banning_ctx, timeval_current_ofs(bantime->time,0), ctdb_ban_node_event, ctdb);
 141
 142         if (!already_banned) {
 143                 ctdb_local_node_got_banned(ctdb);
 144         }
 145         return 0;
 146 }
 147
 148 int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
 149 {
 150         struct ctdb_ban_time *bantime;
 151
 152         bantime = talloc(outdata, struct ctdb_ban_time);
 153         CTDB_NO_MEMORY(ctdb, bantime);
 154
 155         if (ctdb->banning_ctx != NULL) {
 156                 *bantime = *(struct ctdb_ban_time *)(ctdb->banning_ctx);
 157         } else {
 158                 bantime->pnn = ctdb->pnn;
 159                 bantime->time = 0;
 160         }
 161
 162         outdata->dptr  = (uint8_t *)bantime;
 163         outdata->dsize = sizeof(struct ctdb_ban_time);
 164
 165         return 0;
 166 }
 167
 168 /* Routine to ban ourselves for a while when trouble strikes. */
 169 void ctdb_ban_self(struct ctdb_context *ctdb)
 170 {
 171         TDB_DATA data;
 172         struct ctdb_ban_time bantime;
 173
 174         bantime.pnn  = ctdb->pnn;
 175         bantime.time = ctdb->tunable.recovery_ban_period;
 176
 177         data.dsize = sizeof(bantime);
 178         data.dptr  = (uint8_t *)&bantime;
 179
 180         ctdb_control_set_ban_state(ctdb, data);
 181 }