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         for (i=1; i<=NUM_DB_PRIORITIES; i++) {
  74                 ctdb_start_freeze(ctdb, i);
  75         }
  76         ctdb_release_all_ips(ctdb);
  77         ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE;
  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
  84         DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
  85
  86         if (bantime->pnn != ctdb->pnn) {
  87                 if (bantime->pnn >= ctdb->num_nodes) {
  88                         DEBUG(DEBUG_ERR,(__location__ " ERROR: Invalid ban request. PNN:%d is invalid. Max nodes %d\n", bantime->pnn, ctdb->num_nodes));
  89                         return -1;
  90                 }
  91                 if (bantime->time == 0) {
  92                         DEBUG(DEBUG_NOTICE,("unbanning node %d\n", bantime->pnn));
  93                         ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
  94                 } else {
  95                         DEBUG(DEBUG_NOTICE,("banning node %d\n", bantime->pnn));
  96                         if (ctdb->tunable.enable_bans == 0) {
  97                                 /* FIXME: This is bogus. We really should be
  98                                  * taking decision based on the tunables on
  99                                  * the banned node and not local node.
 100                                  */
 101                                 DEBUG(DEBUG_WARNING,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 102                                 return 0;
 103                         }
 104
 105                         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 106                 }
 107                 return 0;
 108         }
 109
 110         if (ctdb->banning_ctx != NULL) {
 111                 talloc_free(ctdb->banning_ctx);
 112                 ctdb->banning_ctx = NULL;
 113         }
 114
 115         if (bantime->time == 0) {
 116                 DEBUG(DEBUG_ERR,("Unbanning this node\n"));
 117                 ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
 118                 return 0;
 119         }
 120
 121         if (ctdb->tunable.enable_bans == 0) {
 122                 DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 123                 return 0;
 124         }
 125
 126         ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_time);
 127         if (ctdb->banning_ctx == NULL) {
 128                 DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
 129                 return -1;
 130         }
 131         *((struct ctdb_ban_time *)(ctdb->banning_ctx)) = *bantime;
 132
 133
 134         DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
 135         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 136
 137         event_add_timed(ctdb->ev, ctdb->banning_ctx, timeval_current_ofs(bantime->time,0), ctdb_ban_node_event, ctdb);
 138
 139         ctdb_local_node_got_banned(ctdb);
 140         return 0;
 141 }
 142
 143 int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
 144 {
 145         struct ctdb_ban_time *bantime;
 146
 147         bantime = talloc(outdata, struct ctdb_ban_time);
 148         CTDB_NO_MEMORY(ctdb, bantime);
 149
 150         if (ctdb->banning_ctx != NULL) {
 151                 *bantime = *(struct ctdb_ban_time *)(ctdb->banning_ctx);
 152         } else {
 153                 bantime->pnn = ctdb->pnn;
 154                 bantime->time = 0;
 155         }
 156
 157         outdata->dptr  = (uint8_t *)bantime;
 158         outdata->dsize = sizeof(struct ctdb_ban_time);
 159
 160         return 0;
 161 }
 162
 163 /* Routine to ban ourselves for a while when trouble strikes. */
 164 void ctdb_ban_self(struct ctdb_context *ctdb)
 165 {
 166         TDB_DATA data;
 167         struct ctdb_ban_time bantime;
 168
 169         bantime.pnn  = ctdb->pnn;
 170         bantime.time = ctdb->tunable.recovery_ban_period;
 171
 172         data.dsize = sizeof(bantime);
 173         data.dptr  = (uint8_t *)&bantime;
 174
 175         ctdb_control_set_ban_state(ctdb, data);
 176 }