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 "replace.h"
  20 #include "system/time.h"
  21 #include "system/network.h"
  22 #include "system/filesys.h"
  23 #include "system/wait.h"
  24
  25 #include <talloc.h>
  26 #include <tevent.h>
  27
  28 #include "lib/util/debug.h"
  29 #include "lib/util/samba_util.h"
  30
  31 #include "ctdb_private.h"
  32 #include "ctdb_client.h"
  33
  34 #include "common/common.h"
  35 #include "common/logging.h"
  36
  37 static void ctdb_ban_node_event(struct tevent_context *ev,
  38                                 struct tevent_timer *te,
  39                                 struct timeval t, void *private_data)
  40 {
  41         struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context);
  42
  43         /* Make sure we were able to freeze databases during banning */
  44         if (!ctdb_db_all_frozen(ctdb)) {
  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         struct ctdb_db_context *ctdb_db;
  62
  63         DEBUG(DEBUG_NOTICE,("This node has been banned - forcing recovery\n"));
  64
  65         /* Reset the generation id to 1 to make us ignore any
  66            REQ/REPLY CALL/DMASTER someone sends to us.
  67            We are now banned so we shouldnt service database calls
  68            anymore.
  69         */
  70         ctdb->vnn_map->generation = INVALID_GENERATION;
  71         for (ctdb_db = ctdb->db_list; ctdb_db != NULL; ctdb_db = ctdb_db->next) {
  72                 ctdb_db->generation = INVALID_GENERATION;
  73         }
  74
  75         /* Recovery daemon will set the recovery mode ACTIVE and freeze
  76          * databases.
  77          */
  78
  79         ctdb_release_all_ips(ctdb);
  80 }
  81
  82 int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata)
  83 {
  84         struct ctdb_ban_state *bantime = (struct ctdb_ban_state *)indata.dptr;
  85         bool already_banned;
  86
  87         DEBUG(DEBUG_INFO,("SET BAN STATE\n"));
  88
  89         if (bantime->pnn != ctdb->pnn) {
  90                 DEBUG(DEBUG_WARNING,
  91                       ("SET_BAN_STATE control for PNN %d ignored\n",
  92                        bantime->pnn));
  93                 return -1;
  94         }
  95
  96         already_banned = false;
  97         if (ctdb->banning_ctx != NULL) {
  98                 talloc_free(ctdb->banning_ctx);
  99                 ctdb->banning_ctx = NULL;
 100                 already_banned = true;
 101         }
 102
 103         if (bantime->time == 0) {
 104                 DEBUG(DEBUG_ERR,("Unbanning this node\n"));
 105                 ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED;
 106                 return 0;
 107         }
 108
 109         if (ctdb->tunable.enable_bans == 0) {
 110                 DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn));
 111                 return 0;
 112         }
 113
 114         ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_state);
 115         if (ctdb->banning_ctx == NULL) {
 116                 DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n"));
 117                 return -1;
 118         }
 119         *((struct ctdb_ban_state *)(ctdb->banning_ctx)) = *bantime;
 120
 121
 122         DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time));
 123         ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED;
 124
 125         tevent_add_timer(ctdb->ev, ctdb->banning_ctx,
 126                          timeval_current_ofs(bantime->time,0),
 127                          ctdb_ban_node_event, ctdb);
 128
 129         if (!already_banned) {
 130                 ctdb_local_node_got_banned(ctdb);
 131         }
 132         return 0;
 133 }
 134
 135 int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata)
 136 {
 137         struct ctdb_ban_state *bantime;
 138
 139         bantime = talloc(outdata, struct ctdb_ban_state);
 140         CTDB_NO_MEMORY(ctdb, bantime);
 141
 142         if (ctdb->banning_ctx != NULL) {
 143                 *bantime = *(struct ctdb_ban_state *)(ctdb->banning_ctx);
 144         } else {
 145                 bantime->pnn = ctdb->pnn;
 146                 bantime->time = 0;
 147         }
 148
 149         outdata->dptr  = (uint8_t *)bantime;
 150         outdata->dsize = sizeof(struct ctdb_ban_state);
 151
 152         return 0;
 153 }
 154
 155 /* Routine to ban ourselves for a while when trouble strikes. */
 156 void ctdb_ban_self(struct ctdb_context *ctdb)
 157 {
 158         TDB_DATA data;
 159         struct ctdb_ban_state bantime;
 160
 161         bantime.pnn  = ctdb->pnn;
 162         bantime.time = ctdb->tunable.recovery_ban_period;
 163
 164         data.dsize = sizeof(bantime);
 165         data.dptr  = (uint8_t *)&bantime;
 166
 167         ctdb_control_set_ban_state(ctdb, data);
 168 }