diff options
Diffstat (limited to 'ctdb/server/ctdb_banning.c')
| -rw-r--r-- | ctdb/server/ctdb_banning.c | 146 |
1 files changed, 146 insertions, 0 deletions
diff --git a/ctdb/server/ctdb_banning.c b/ctdb/server/ctdb_banning.c new file mode 100644 index 0000000..3c71157 --- /dev/null +++ b/ctdb/server/ctdb_banning.c @@ -0,0 +1,146 @@ +/* + ctdb banning code + + Copyright (C) Ronnie Sahlberg 2009 + + 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/time.h" +#include "system/network.h" +#include "system/filesys.h" +#include "system/wait.h" + +#include <talloc.h> +#include <tevent.h> + +#include "lib/util/debug.h" +#include "lib/util/samba_util.h" + +#include "ctdb_private.h" +#include "ctdb_client.h" + +#include "common/common.h" +#include "common/logging.h" + +static void ctdb_ban_node_event(struct tevent_context *ev, + struct tevent_timer *te, + struct timeval t, void *private_data) +{ + struct ctdb_context *ctdb = talloc_get_type(private_data, struct ctdb_context); + + /* Make sure we were able to freeze databases during banning */ + if (!ctdb_db_all_frozen(ctdb)) { + DEBUG(DEBUG_ERR, ("Banning timed out, but not all databases " + "frozen yet - banning this node again.\n")); + ctdb_ban_self(ctdb); + return; + } + + DEBUG(DEBUG_ERR,("Banning timed out\n")); + ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_BANNED; + + if (ctdb->banning_ctx != NULL) { + talloc_free(ctdb->banning_ctx); + ctdb->banning_ctx = NULL; + } +} + +int32_t ctdb_control_set_ban_state(struct ctdb_context *ctdb, TDB_DATA indata) +{ + struct ctdb_ban_state *bantime = (struct ctdb_ban_state *)indata.dptr; + bool already_banned; + + DEBUG(DEBUG_INFO,("SET BAN STATE\n")); + + if (bantime->pnn != ctdb->pnn) { + DEBUG(DEBUG_WARNING, + ("SET_BAN_STATE control for PNN %d ignored\n", + bantime->pnn)); + return -1; + } + + already_banned = false; + if (ctdb->banning_ctx != NULL) { + talloc_free(ctdb->banning_ctx); + ctdb->banning_ctx = NULL; + already_banned = true; + } + + if (bantime->time == 0) { + DEBUG(DEBUG_ERR,("Unbanning this node\n")); + ctdb->nodes[bantime->pnn]->flags &= ~NODE_FLAGS_BANNED; + return 0; + } + + if (ctdb->tunable.enable_bans == 0) { + DEBUG(DEBUG_ERR,("Bans are disabled - ignoring ban of node %u\n", bantime->pnn)); + return 0; + } + + ctdb->banning_ctx = talloc(ctdb, struct ctdb_ban_state); + if (ctdb->banning_ctx == NULL) { + DEBUG(DEBUG_CRIT,(__location__ " ERROR Failed to allocate new banning state\n")); + return -1; + } + *((struct ctdb_ban_state *)(ctdb->banning_ctx)) = *bantime; + + + DEBUG(DEBUG_ERR,("Banning this node for %d seconds\n", bantime->time)); + ctdb->nodes[bantime->pnn]->flags |= NODE_FLAGS_BANNED; + + tevent_add_timer(ctdb->ev, ctdb->banning_ctx, + timeval_current_ofs(bantime->time,0), + ctdb_ban_node_event, ctdb); + + if (!already_banned) { + ctdb_node_become_inactive(ctdb); + } + return 0; +} + +int32_t ctdb_control_get_ban_state(struct ctdb_context *ctdb, TDB_DATA *outdata) +{ + struct ctdb_ban_state *bantime; + + bantime = talloc(outdata, struct ctdb_ban_state); + CTDB_NO_MEMORY(ctdb, bantime); + + if (ctdb->banning_ctx != NULL) { + *bantime = *(struct ctdb_ban_state *)(ctdb->banning_ctx); + } else { + bantime->pnn = ctdb->pnn; + bantime->time = 0; + } + + outdata->dptr = (uint8_t *)bantime; + outdata->dsize = sizeof(struct ctdb_ban_state); + + return 0; +} + +/* Routine to ban ourselves for a while when trouble strikes. */ +void ctdb_ban_self(struct ctdb_context *ctdb) +{ + TDB_DATA data; + struct ctdb_ban_state bantime; + + bantime.pnn = ctdb->pnn; + bantime.time = ctdb->tunable.recovery_ban_period; + + data.dsize = sizeof(bantime); + data.dptr = (uint8_t *)&bantime; + + ctdb_control_set_ban_state(ctdb, data); +} |