diff options
Diffstat (limited to 'ctdb/server/ctdb_recover.c')
| -rw-r--r-- | ctdb/server/ctdb_recover.c | 1243 |
1 files changed, 1243 insertions, 0 deletions
diff --git a/ctdb/server/ctdb_recover.c b/ctdb/server/ctdb_recover.c new file mode 100644 index 0000000..7b30d11 --- /dev/null +++ b/ctdb/server/ctdb_recover.c @@ -0,0 +1,1243 @@ +/* + ctdb recovery code + + Copyright (C) Andrew Tridgell 2007 + Copyright (C) Ronnie Sahlberg 2007 + + 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 <tdb.h> + +#include "lib/tdb_wrap/tdb_wrap.h" +#include "lib/util/dlinklist.h" +#include "lib/util/debug.h" +#include "lib/util/time.h" +#include "lib/util/util_process.h" + +#include "ctdb_private.h" +#include "ctdb_client.h" + +#include "common/system.h" +#include "common/common.h" +#include "common/logging.h" + +#include "ctdb_cluster_mutex.h" + +int +ctdb_control_getvnnmap(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata) +{ + struct ctdb_vnn_map_wire *map; + size_t len; + + CHECK_CONTROL_DATA_SIZE(0); + + len = offsetof(struct ctdb_vnn_map_wire, map) + sizeof(uint32_t)*ctdb->vnn_map->size; + map = talloc_size(outdata, len); + CTDB_NO_MEMORY(ctdb, map); + + map->generation = ctdb->vnn_map->generation; + map->size = ctdb->vnn_map->size; + memcpy(map->map, ctdb->vnn_map->map, sizeof(uint32_t)*map->size); + + outdata->dsize = len; + outdata->dptr = (uint8_t *)map; + + return 0; +} + +int +ctdb_control_setvnnmap(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata) +{ + struct ctdb_vnn_map_wire *map = (struct ctdb_vnn_map_wire *)indata.dptr; + + if (ctdb->recovery_mode != CTDB_RECOVERY_ACTIVE) { + DEBUG(DEBUG_ERR, ("Attempt to set vnnmap when not in recovery\n")); + return -1; + } + + talloc_free(ctdb->vnn_map); + + ctdb->vnn_map = talloc(ctdb, struct ctdb_vnn_map); + CTDB_NO_MEMORY(ctdb, ctdb->vnn_map); + + ctdb->vnn_map->generation = map->generation; + ctdb->vnn_map->size = map->size; + ctdb->vnn_map->map = talloc_array(ctdb->vnn_map, uint32_t, map->size); + CTDB_NO_MEMORY(ctdb, ctdb->vnn_map->map); + + memcpy(ctdb->vnn_map->map, map->map, sizeof(uint32_t)*map->size); + + return 0; +} + +int +ctdb_control_getdbmap(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata) +{ + uint32_t i, len; + struct ctdb_db_context *ctdb_db; + struct ctdb_dbid_map_old *dbid_map; + + CHECK_CONTROL_DATA_SIZE(0); + + len = 0; + for(ctdb_db=ctdb->db_list;ctdb_db;ctdb_db=ctdb_db->next){ + len++; + } + + + outdata->dsize = offsetof(struct ctdb_dbid_map_old, dbs) + sizeof(dbid_map->dbs[0])*len; + outdata->dptr = (unsigned char *)talloc_zero_size(outdata, outdata->dsize); + if (!outdata->dptr) { + DEBUG(DEBUG_ALERT, (__location__ " Failed to allocate dbmap array\n")); + exit(1); + } + + dbid_map = (struct ctdb_dbid_map_old *)outdata->dptr; + dbid_map->num = len; + for (i=0,ctdb_db=ctdb->db_list;ctdb_db;i++,ctdb_db=ctdb_db->next){ + dbid_map->dbs[i].db_id = ctdb_db->db_id; + dbid_map->dbs[i].flags = ctdb_db->db_flags; + } + + return 0; +} + +int +ctdb_control_getnodemap(struct ctdb_context *ctdb, uint32_t opcode, TDB_DATA indata, TDB_DATA *outdata) +{ + CHECK_CONTROL_DATA_SIZE(0); + + outdata->dptr = (unsigned char *)ctdb_node_list_to_map(ctdb->nodes, + ctdb->num_nodes, + outdata); + if (outdata->dptr == NULL) { + return -1; + } + + outdata->dsize = talloc_get_size(outdata->dptr); + + return 0; +} + +/* + reload the nodes file +*/ +int +ctdb_control_reload_nodes_file(struct ctdb_context *ctdb, uint32_t opcode) +{ + unsigned int i, num_nodes; + TALLOC_CTX *tmp_ctx; + struct ctdb_node **nodes; + + tmp_ctx = talloc_new(ctdb); + + /* steal the old nodes file for a while */ + talloc_steal(tmp_ctx, ctdb->nodes); + nodes = ctdb->nodes; + ctdb->nodes = NULL; + num_nodes = ctdb->num_nodes; + ctdb->num_nodes = 0; + + /* load the new nodes file */ + ctdb_load_nodes_file(ctdb); + + for (i=0; i<ctdb->num_nodes; i++) { + /* keep any identical pre-existing nodes and connections */ + if ((i < num_nodes) && ctdb_same_address(&ctdb->nodes[i]->address, &nodes[i]->address)) { + talloc_free(ctdb->nodes[i]); + ctdb->nodes[i] = talloc_steal(ctdb->nodes, nodes[i]); + continue; + } + + if (ctdb->nodes[i]->flags & NODE_FLAGS_DELETED) { + continue; + } + + /* any new or different nodes must be added */ + if (ctdb->methods->add_node(ctdb->nodes[i]) != 0) { + DEBUG(DEBUG_CRIT, (__location__ " methods->add_node failed at %d\n", i)); + ctdb_fatal(ctdb, "failed to add node. shutting down\n"); + } + if (ctdb->methods->connect_node(ctdb->nodes[i]) != 0) { + DEBUG(DEBUG_CRIT, (__location__ " methods->add_connect failed at %d\n", i)); + ctdb_fatal(ctdb, "failed to connect to node. shutting down\n"); + } + } + + /* tell the recovery daemon to reload the nodes file too */ + ctdb_daemon_send_message(ctdb, ctdb->pnn, CTDB_SRVID_RELOAD_NODES, tdb_null); + + talloc_free(tmp_ctx); + + return 0; +} + +struct db_pull_state { + struct ctdb_context *ctdb; + struct ctdb_db_context *ctdb_db; + struct ctdb_marshall_buffer *recs; + uint32_t pnn; + uint64_t srvid; + uint32_t num_records; +}; + +static int traverse_db_pull(struct tdb_context *tdb, TDB_DATA key, + TDB_DATA data, void *private_data) +{ + struct db_pull_state *state = (struct db_pull_state *)private_data; + struct ctdb_marshall_buffer *recs; + + recs = ctdb_marshall_add(state->ctdb, state->recs, + state->ctdb_db->db_id, 0, key, NULL, data); + if (recs == NULL) { + TALLOC_FREE(state->recs); + return -1; + } + state->recs = recs; + + if (talloc_get_size(state->recs) >= + state->ctdb->tunable.rec_buffer_size_limit) { + TDB_DATA buffer; + int ret; + + buffer = ctdb_marshall_finish(state->recs); + ret = ctdb_daemon_send_message(state->ctdb, state->pnn, + state->srvid, buffer); + if (ret != 0) { + TALLOC_FREE(state->recs); + return -1; + } + + state->num_records += state->recs->count; + TALLOC_FREE(state->recs); + } + + return 0; +} + +int32_t ctdb_control_db_pull(struct ctdb_context *ctdb, + struct ctdb_req_control_old *c, + TDB_DATA indata, TDB_DATA *outdata) +{ + struct ctdb_pulldb_ext *pulldb_ext; + struct ctdb_db_context *ctdb_db; + struct db_pull_state state; + int ret; + + pulldb_ext = (struct ctdb_pulldb_ext *)indata.dptr; + + ctdb_db = find_ctdb_db(ctdb, pulldb_ext->db_id); + if (ctdb_db == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%08x\n", + pulldb_ext->db_id)); + return -1; + } + + if (!ctdb_db_frozen(ctdb_db)) { + DEBUG(DEBUG_ERR, + ("rejecting ctdb_control_pull_db when not frozen\n")); + return -1; + } + + if (ctdb_db->unhealthy_reason) { + /* this is just a warning, as the tdb should be empty anyway */ + DEBUG(DEBUG_WARNING, + ("db(%s) unhealty in ctdb_control_db_pull: %s\n", + ctdb_db->db_name, ctdb_db->unhealthy_reason)); + } + + state.ctdb = ctdb; + state.ctdb_db = ctdb_db; + state.recs = NULL; + state.pnn = c->hdr.srcnode; + state.srvid = pulldb_ext->srvid; + state.num_records = 0; + + /* If the records are invalid, we are done */ + if (ctdb_db->invalid_records) { + goto done; + } + + if (ctdb_lockdb_mark(ctdb_db) != 0) { + DEBUG(DEBUG_ERR, + (__location__ " Failed to get lock on entire db - failing\n")); + return -1; + } + + ret = tdb_traverse_read(ctdb_db->ltdb->tdb, traverse_db_pull, &state); + if (ret == -1) { + DEBUG(DEBUG_ERR, + (__location__ " Failed to get traverse db '%s'\n", + ctdb_db->db_name)); + ctdb_lockdb_unmark(ctdb_db); + return -1; + } + + /* Last few records */ + if (state.recs != NULL) { + TDB_DATA buffer; + + buffer = ctdb_marshall_finish(state.recs); + ret = ctdb_daemon_send_message(state.ctdb, state.pnn, + state.srvid, buffer); + if (ret != 0) { + TALLOC_FREE(state.recs); + ctdb_lockdb_unmark(ctdb_db); + return -1; + } + + state.num_records += state.recs->count; + TALLOC_FREE(state.recs); + } + + ctdb_lockdb_unmark(ctdb_db); + +done: + outdata->dptr = talloc_size(outdata, sizeof(uint32_t)); + if (outdata->dptr == NULL) { + DEBUG(DEBUG_ERR, (__location__ " Memory allocation error\n")); + return -1; + } + + memcpy(outdata->dptr, (uint8_t *)&state.num_records, sizeof(uint32_t)); + outdata->dsize = sizeof(uint32_t); + + return 0; +} + +struct db_push_state { + struct ctdb_context *ctdb; + struct ctdb_db_context *ctdb_db; + uint64_t srvid; + uint32_t num_records; + bool failed; +}; + +static void db_push_msg_handler(uint64_t srvid, TDB_DATA indata, + void *private_data) +{ + struct db_push_state *state = talloc_get_type( + private_data, struct db_push_state); + struct ctdb_marshall_buffer *recs; + struct ctdb_rec_data_old *rec; + unsigned int i; + int ret; + + if (state->failed) { + return; + } + + recs = (struct ctdb_marshall_buffer *)indata.dptr; + rec = (struct ctdb_rec_data_old *)&recs->data[0]; + + DEBUG(DEBUG_INFO, ("starting push of %u records for dbid 0x%x\n", + recs->count, recs->db_id)); + + for (i=0; i<recs->count; i++) { + TDB_DATA key, data; + struct ctdb_ltdb_header *hdr; + + key.dptr = &rec->data[0]; + key.dsize = rec->keylen; + data.dptr = &rec->data[key.dsize]; + data.dsize = rec->datalen; + + if (data.dsize < sizeof(struct ctdb_ltdb_header)) { + DEBUG(DEBUG_CRIT,(__location__ " bad ltdb record\n")); + goto failed; + } + + hdr = (struct ctdb_ltdb_header *)data.dptr; + /* Strip off any read only record flags. + * All readonly records are revoked implicitly by a recovery. + */ + hdr->flags &= ~CTDB_REC_RO_FLAGS; + + data.dptr += sizeof(*hdr); + data.dsize -= sizeof(*hdr); + + ret = ctdb_ltdb_store(state->ctdb_db, key, hdr, data); + if (ret != 0) { + DEBUG(DEBUG_ERR, + (__location__ " Unable to store record\n")); + goto failed; + } + + rec = (struct ctdb_rec_data_old *)(rec->length + (uint8_t *)rec); + } + + DEBUG(DEBUG_DEBUG, ("finished push of %u records for dbid 0x%x\n", + recs->count, recs->db_id)); + + state->num_records += recs->count; + return; + +failed: + state->failed = true; +} + +int32_t ctdb_control_db_push_start(struct ctdb_context *ctdb, TDB_DATA indata) +{ + struct ctdb_pulldb_ext *pulldb_ext; + struct ctdb_db_context *ctdb_db; + struct db_push_state *state; + int ret; + + pulldb_ext = (struct ctdb_pulldb_ext *)indata.dptr; + + ctdb_db = find_ctdb_db(ctdb, pulldb_ext->db_id); + if (ctdb_db == NULL) { + DEBUG(DEBUG_ERR, + (__location__ " Unknown db 0x%08x\n", pulldb_ext->db_id)); + return -1; + } + + if (!ctdb_db_frozen(ctdb_db)) { + DEBUG(DEBUG_ERR, + ("rejecting ctdb_control_db_push_start when not frozen\n")); + return -1; + } + + if (ctdb_db->push_started) { + DEBUG(DEBUG_WARNING, + (__location__ " DB push already started for %s\n", + ctdb_db->db_name)); + + /* De-register old state */ + state = (struct db_push_state *)ctdb_db->push_state; + if (state != NULL) { + srvid_deregister(ctdb->srv, state->srvid, state); + talloc_free(state); + ctdb_db->push_state = NULL; + } + } + + state = talloc_zero(ctdb_db, struct db_push_state); + if (state == NULL) { + DEBUG(DEBUG_ERR, (__location__ " Memory allocation error\n")); + return -1; + } + + state->ctdb = ctdb; + state->ctdb_db = ctdb_db; + state->srvid = pulldb_ext->srvid; + state->failed = false; + + ret = srvid_register(ctdb->srv, state, state->srvid, + db_push_msg_handler, state); + if (ret != 0) { + DEBUG(DEBUG_ERR, + (__location__ " Failed to register srvid for db push\n")); + talloc_free(state); + return -1; + } + + if (ctdb_lockdb_mark(ctdb_db) != 0) { + DEBUG(DEBUG_ERR, + (__location__ " Failed to get lock on entire db - failing\n")); + srvid_deregister(ctdb->srv, state->srvid, state); + talloc_free(state); + return -1; + } + + ctdb_db->push_started = true; + ctdb_db->push_state = state; + + return 0; +} + +int32_t ctdb_control_db_push_confirm(struct ctdb_context *ctdb, + TDB_DATA indata, TDB_DATA *outdata) +{ + uint32_t db_id; + struct ctdb_db_context *ctdb_db; + struct db_push_state *state; + + db_id = *(uint32_t *)indata.dptr; + + ctdb_db = find_ctdb_db(ctdb, db_id); + if (ctdb_db == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%08x\n", db_id)); + return -1; + } + + if (!ctdb_db_frozen(ctdb_db)) { + DEBUG(DEBUG_ERR, + ("rejecting ctdb_control_db_push_confirm when not frozen\n")); + return -1; + } + + if (!ctdb_db->push_started) { + DEBUG(DEBUG_ERR, (__location__ " DB push not started\n")); + return -1; + } + + if (ctdb_db_readonly(ctdb_db)) { + DEBUG(DEBUG_ERR, + ("Clearing the tracking database for dbid 0x%x\n", + ctdb_db->db_id)); + if (tdb_wipe_all(ctdb_db->rottdb) != 0) { + DEBUG(DEBUG_ERR, + ("Failed to wipe tracking database for 0x%x." + " Dropping read-only delegation support\n", + ctdb_db->db_id)); + tdb_close(ctdb_db->rottdb); + ctdb_db->rottdb = NULL; + ctdb_db_reset_readonly(ctdb_db); + } + + while (ctdb_db->revokechild_active != NULL) { + talloc_free(ctdb_db->revokechild_active); + } + } + + ctdb_lockdb_unmark(ctdb_db); + + state = (struct db_push_state *)ctdb_db->push_state; + if (state == NULL) { + DEBUG(DEBUG_ERR, (__location__ " Missing push db state\n")); + return -1; + } + + srvid_deregister(ctdb->srv, state->srvid, state); + + outdata->dptr = talloc_size(outdata, sizeof(uint32_t)); + if (outdata->dptr == NULL) { + DEBUG(DEBUG_ERR, (__location__ " Memory allocation error\n")); + talloc_free(state); + ctdb_db->push_state = NULL; + return -1; + } + + memcpy(outdata->dptr, (uint8_t *)&state->num_records, sizeof(uint32_t)); + outdata->dsize = sizeof(uint32_t); + + talloc_free(state); + ctdb_db->push_started = false; + ctdb_db->push_state = NULL; + + return 0; +} + +struct set_recmode_state { + struct ctdb_context *ctdb; + struct ctdb_req_control_old *c; +}; + +static void set_recmode_handler(char status, + double latency, + void *private_data) +{ + struct set_recmode_state *state = talloc_get_type_abort( + private_data, struct set_recmode_state); + int s = 0; + const char *err = NULL; + + switch (status) { + case '0': + /* Mutex taken */ + DEBUG(DEBUG_ERR, + ("ERROR: Daemon able to take recovery lock on \"%s\" during recovery\n", + state->ctdb->recovery_lock)); + s = -1; + err = "Took recovery lock from daemon during recovery - probably a cluster filesystem lock coherence problem"; + break; + + case '1': + /* Contention */ + DEBUG(DEBUG_DEBUG, (__location__ " Recovery lock check OK\n")); + state->ctdb->recovery_mode = CTDB_RECOVERY_NORMAL; + ctdb_process_deferred_attach(state->ctdb); + + s = 0; + + CTDB_UPDATE_RECLOCK_LATENCY(state->ctdb, "daemon reclock", + reclock.ctdbd, latency); + break; + + case '2': + /* Timeout. Consider this a success, not a failure, + * as we failed to set the recovery lock which is what + * we wanted. This can be caused by the cluster + * filesystem being very slow to arbitrate locks + * immediately after a node failure. */ + DEBUG(DEBUG_WARNING, + (__location__ + "Time out getting recovery lock, allowing recmode set anyway\n")); + state->ctdb->recovery_mode = CTDB_RECOVERY_NORMAL; + ctdb_process_deferred_attach(state->ctdb); + + s = 0; + break; + + default: + DEBUG(DEBUG_ERR, + ("Unexpected error when testing recovery lock\n")); + s = -1; + err = "Unexpected error when testing recovery lock"; + } + + ctdb_request_control_reply(state->ctdb, state->c, NULL, s, err); + talloc_free(state); +} + +static void +ctdb_drop_all_ips_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); + + DEBUG(DEBUG_ERR,(__location__ " Been in recovery mode for too long. Dropping all IPS\n")); + talloc_free(ctdb->release_ips_ctx); + ctdb->release_ips_ctx = NULL; + + ctdb_release_all_ips(ctdb); +} + +/* + * Set up an event to drop all public ips if we remain in recovery for too + * long + */ +int ctdb_deferred_drop_all_ips(struct ctdb_context *ctdb) +{ + if (ctdb->release_ips_ctx != NULL) { + talloc_free(ctdb->release_ips_ctx); + } + ctdb->release_ips_ctx = talloc_new(ctdb); + CTDB_NO_MEMORY(ctdb, ctdb->release_ips_ctx); + + tevent_add_timer(ctdb->ev, ctdb->release_ips_ctx, + timeval_current_ofs(ctdb->tunable.recovery_drop_all_ips, 0), + ctdb_drop_all_ips_event, ctdb); + return 0; +} + +/* + set the recovery mode + */ +int32_t ctdb_control_set_recmode(struct ctdb_context *ctdb, + struct ctdb_req_control_old *c, + TDB_DATA indata, bool *async_reply, + const char **errormsg) +{ + uint32_t recmode = *(uint32_t *)indata.dptr; + struct ctdb_db_context *ctdb_db; + struct set_recmode_state *state; + struct ctdb_cluster_mutex_handle *h; + + if (recmode == ctdb->recovery_mode) { + D_INFO("Recovery mode already set to %s\n", + recmode == CTDB_RECOVERY_NORMAL ? "NORMAL" : "ACTIVE"); + return 0; + } + + D_NOTICE("Recovery mode set to %s\n", + recmode == CTDB_RECOVERY_NORMAL ? "NORMAL" : "ACTIVE"); + + /* if we enter recovery but stay in recovery for too long + we will eventually drop all our ip addresses + */ + if (recmode == CTDB_RECOVERY_ACTIVE) { + if (ctdb_deferred_drop_all_ips(ctdb) != 0) { + D_ERR("Failed to set up deferred drop all ips\n"); + } + + ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + return 0; + } + + /* From this point: recmode == CTDB_RECOVERY_NORMAL + * + * Therefore, what follows is special handling when setting + * recovery mode back to normal */ + + TALLOC_FREE(ctdb->release_ips_ctx); + + for (ctdb_db = ctdb->db_list; ctdb_db != NULL; ctdb_db = ctdb_db->next) { + if (ctdb_db->generation != ctdb->vnn_map->generation) { + DEBUG(DEBUG_ERR, + ("Inconsistent DB generation %u for %s\n", + ctdb_db->generation, ctdb_db->db_name)); + DEBUG(DEBUG_ERR, ("Recovery mode set to ACTIVE\n")); + return -1; + } + } + + /* force the databases to thaw */ + if (ctdb_db_all_frozen(ctdb)) { + ctdb_control_thaw(ctdb, false); + } + + if (ctdb->recovery_lock == NULL) { + /* Not using recovery lock file */ + ctdb->recovery_mode = CTDB_RECOVERY_NORMAL; + ctdb_process_deferred_attach(ctdb); + return 0; + } + + state = talloc_zero(ctdb, struct set_recmode_state); + if (state == NULL) { + DEBUG(DEBUG_ERR, (__location__ " out of memory\n")); + return -1; + } + state->ctdb = ctdb; + state->c = NULL; + + h = ctdb_cluster_mutex(state, ctdb, ctdb->recovery_lock, 5, + set_recmode_handler, state, NULL, NULL); + if (h == NULL) { + talloc_free(state); + return -1; + } + + state->c = talloc_steal(state, c); + *async_reply = true; + + return 0; +} + + +/* + delete a record as part of the vacuum process + only delete if we are not lmaster or dmaster, and our rsn is <= the provided rsn + use non-blocking locks + + return 0 if the record was successfully deleted (i.e. it does not exist + when the function returns) + or !0 is the record still exists in the tdb after returning. + */ +static int delete_tdb_record(struct ctdb_context *ctdb, struct ctdb_db_context *ctdb_db, struct ctdb_rec_data_old *rec) +{ + TDB_DATA key, data, data2; + struct ctdb_ltdb_header *hdr, *hdr2; + + /* these are really internal tdb functions - but we need them here for + non-blocking lock of the freelist */ + int tdb_lock_nonblock(struct tdb_context *tdb, int list, int ltype); + int tdb_unlock(struct tdb_context *tdb, int list, int ltype); + + + key.dsize = rec->keylen; + key.dptr = &rec->data[0]; + data.dsize = rec->datalen; + data.dptr = &rec->data[rec->keylen]; + + if (ctdb_lmaster(ctdb, &key) == ctdb->pnn) { + DBG_INFO("Called delete on record where we are lmaster\n"); + return -1; + } + + if (data.dsize != sizeof(struct ctdb_ltdb_header)) { + DBG_ERR("Bad record size\n"); + return -1; + } + + hdr = (struct ctdb_ltdb_header *)data.dptr; + + /* use a non-blocking lock */ + if (tdb_chainlock_nonblock(ctdb_db->ltdb->tdb, key) != 0) { + DBG_INFO("Failed to get non-blocking chain lock\n"); + return -1; + } + + data2 = tdb_fetch(ctdb_db->ltdb->tdb, key); + if (data2.dptr == NULL) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + return 0; + } + + if (data2.dsize < sizeof(struct ctdb_ltdb_header)) { + if (tdb_lock_nonblock(ctdb_db->ltdb->tdb, -1, F_WRLCK) == 0) { + if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) { + DBG_ERR("Failed to delete corrupt record\n"); + } + tdb_unlock(ctdb_db->ltdb->tdb, -1, F_WRLCK); + DBG_ERR("Deleted corrupt record\n"); + } + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + free(data2.dptr); + return 0; + } + + hdr2 = (struct ctdb_ltdb_header *)data2.dptr; + + if (hdr2->rsn > hdr->rsn) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Skipping record with rsn=%llu - called with rsn=%llu\n", + (unsigned long long)hdr2->rsn, + (unsigned long long)hdr->rsn); + free(data2.dptr); + return -1; + } + + /* do not allow deleting record that have readonly flags set. */ + if (hdr->flags & CTDB_REC_RO_FLAGS) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Skipping record with readonly flags set\n"); + free(data2.dptr); + return -1; + } + if (hdr2->flags & CTDB_REC_RO_FLAGS) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Skipping record with readonly flags set locally\n"); + free(data2.dptr); + return -1; + } + + if (hdr2->dmaster == ctdb->pnn) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Attempted delete record where we are the dmaster\n"); + free(data2.dptr); + return -1; + } + + if (tdb_lock_nonblock(ctdb_db->ltdb->tdb, -1, F_WRLCK) != 0) { + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Failed to get non-blocking freelist lock\n"); + free(data2.dptr); + return -1; + } + + if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) { + tdb_unlock(ctdb_db->ltdb->tdb, -1, F_WRLCK); + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + DBG_INFO("Failed to delete record\n"); + free(data2.dptr); + return -1; + } + + tdb_unlock(ctdb_db->ltdb->tdb, -1, F_WRLCK); + tdb_chainunlock(ctdb_db->ltdb->tdb, key); + free(data2.dptr); + return 0; +} + + + +struct recovery_callback_state { + struct ctdb_req_control_old *c; +}; + + +/* + called when the 'recovered' event script has finished + */ +static void ctdb_end_recovery_callback(struct ctdb_context *ctdb, int status, void *p) +{ + struct recovery_callback_state *state = talloc_get_type(p, struct recovery_callback_state); + + CTDB_INCREMENT_STAT(ctdb, num_recoveries); + + if (status != 0) { + DEBUG(DEBUG_ERR,(__location__ " recovered event script failed (status %d)\n", status)); + if (status == -ETIMEDOUT) { + ctdb_ban_self(ctdb); + } + } + + ctdb_request_control_reply(ctdb, state->c, NULL, status, NULL); + talloc_free(state); + + gettimeofday(&ctdb->last_recovery_finished, NULL); + + if (ctdb->runstate == CTDB_RUNSTATE_FIRST_RECOVERY) { + ctdb_set_runstate(ctdb, CTDB_RUNSTATE_STARTUP); + } +} + +/* + recovery has finished + */ +int32_t ctdb_control_end_recovery(struct ctdb_context *ctdb, + struct ctdb_req_control_old *c, + bool *async_reply) +{ + int ret; + struct recovery_callback_state *state; + + DEBUG(DEBUG_ERR,("Recovery has finished\n")); + + ctdb_persistent_finish_trans3_commits(ctdb); + + state = talloc(ctdb, struct recovery_callback_state); + CTDB_NO_MEMORY(ctdb, state); + + state->c = c; + + ret = ctdb_event_script_callback(ctdb, state, + ctdb_end_recovery_callback, + state, + CTDB_EVENT_RECOVERED, "%s", ""); + + if (ret != 0) { + DEBUG(DEBUG_ERR,(__location__ " Failed to end recovery\n")); + talloc_free(state); + return -1; + } + + /* tell the control that we will be reply asynchronously */ + state->c = talloc_steal(state, c); + *async_reply = true; + return 0; +} + +/* + called when the 'startrecovery' event script has finished + */ +static void ctdb_start_recovery_callback(struct ctdb_context *ctdb, int status, void *p) +{ + struct recovery_callback_state *state = talloc_get_type(p, struct recovery_callback_state); + + if (status != 0) { + DEBUG(DEBUG_ERR,(__location__ " startrecovery event script failed (status %d)\n", status)); + } + + ctdb_request_control_reply(ctdb, state->c, NULL, status, NULL); + talloc_free(state); +} + +static void run_start_recovery_event(struct ctdb_context *ctdb, + struct recovery_callback_state *state) +{ + int ret; + + ret = ctdb_event_script_callback(ctdb, state, + ctdb_start_recovery_callback, + state, + CTDB_EVENT_START_RECOVERY, + "%s", ""); + + if (ret != 0) { + DEBUG(DEBUG_ERR,("Unable to run startrecovery event\n")); + ctdb_request_control_reply(ctdb, state->c, NULL, -1, NULL); + talloc_free(state); + return; + } + + return; +} + +static bool reclock_strings_equal(const char *a, const char *b) +{ + return (a == NULL && b == NULL) || + (a != NULL && b != NULL && strcmp(a, b) == 0); +} + +static void start_recovery_reclock_callback(struct ctdb_context *ctdb, + int32_t status, + TDB_DATA data, + const char *errormsg, + void *private_data) +{ + struct recovery_callback_state *state = talloc_get_type_abort( + private_data, struct recovery_callback_state); + const char *local = ctdb->recovery_lock; + const char *remote = NULL; + + if (status != 0) { + DEBUG(DEBUG_ERR, (__location__ " GET_RECLOCK failed\n")); + ctdb_request_control_reply(ctdb, state->c, NULL, + status, errormsg); + talloc_free(state); + return; + } + + /* Check reclock consistency */ + if (data.dsize > 0) { + /* Ensure NUL-termination */ + data.dptr[data.dsize-1] = '\0'; + remote = (const char *)data.dptr; + } + if (! reclock_strings_equal(local, remote)) { + /* Inconsistent */ + ctdb_request_control_reply(ctdb, state->c, NULL, -1, NULL); + DEBUG(DEBUG_ERR, + ("Recovery lock configuration inconsistent: " + "recmaster has %s, this node has %s, shutting down\n", + remote == NULL ? "NULL" : remote, + local == NULL ? "NULL" : local)); + talloc_free(state); + ctdb_shutdown_sequence(ctdb, 1); + } + DEBUG(DEBUG_INFO, + ("Recovery lock consistency check successful\n")); + + run_start_recovery_event(ctdb, state); +} + +/* Check recovery lock consistency and run eventscripts for the + * "startrecovery" event */ +int32_t ctdb_control_start_recovery(struct ctdb_context *ctdb, + struct ctdb_req_control_old *c, + bool *async_reply) +{ + int ret; + struct recovery_callback_state *state; + uint32_t recmaster = c->hdr.srcnode; + + DEBUG(DEBUG_ERR, ("Recovery has started\n")); + gettimeofday(&ctdb->last_recovery_started, NULL); + + state = talloc(ctdb, struct recovery_callback_state); + CTDB_NO_MEMORY(ctdb, state); + + state->c = c; + + /* Although the recovery master sent this node a start + * recovery control, this node might still think the recovery + * master is disconnected. In this case defer the recovery + * lock consistency check. */ + if (ctdb->nodes[recmaster]->flags & NODE_FLAGS_DISCONNECTED) { + run_start_recovery_event(ctdb, state); + } else { + /* Ask the recovery master about its reclock setting */ + ret = ctdb_daemon_send_control(ctdb, + recmaster, + 0, + CTDB_CONTROL_GET_RECLOCK_FILE, + 0, 0, + tdb_null, + start_recovery_reclock_callback, + state); + + if (ret != 0) { + DEBUG(DEBUG_ERR, (__location__ " GET_RECLOCK failed\n")); + talloc_free(state); + return -1; + } + } + + /* tell the control that we will be reply asynchronously */ + state->c = talloc_steal(state, c); + *async_reply = true; + + return 0; +} + +/* + try to delete all these records as part of the vacuuming process + and return the records we failed to delete +*/ +int32_t ctdb_control_try_delete_records(struct ctdb_context *ctdb, TDB_DATA indata, TDB_DATA *outdata) +{ + struct ctdb_marshall_buffer *reply = (struct ctdb_marshall_buffer *)indata.dptr; + struct ctdb_db_context *ctdb_db; + unsigned int i; + struct ctdb_rec_data_old *rec; + struct ctdb_marshall_buffer *records; + + if (indata.dsize < offsetof(struct ctdb_marshall_buffer, data)) { + DEBUG(DEBUG_ERR,(__location__ " invalid data in try_delete_records\n")); + return -1; + } + + ctdb_db = find_ctdb_db(ctdb, reply->db_id); + if (!ctdb_db) { + DEBUG(DEBUG_ERR,(__location__ " Unknown db 0x%08x\n", reply->db_id)); + return -1; + } + + + DEBUG(DEBUG_DEBUG,("starting try_delete_records of %u records for dbid 0x%x\n", + reply->count, reply->db_id)); + + + /* create a blob to send back the records we couldn't delete */ + records = (struct ctdb_marshall_buffer *) + talloc_zero_size(outdata, + offsetof(struct ctdb_marshall_buffer, data)); + if (records == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Out of memory\n")); + return -1; + } + records->db_id = ctdb_db->db_id; + + + rec = (struct ctdb_rec_data_old *)&reply->data[0]; + for (i=0;i<reply->count;i++) { + TDB_DATA key, data; + + key.dptr = &rec->data[0]; + key.dsize = rec->keylen; + data.dptr = &rec->data[key.dsize]; + data.dsize = rec->datalen; + + if (data.dsize < sizeof(struct ctdb_ltdb_header)) { + DEBUG(DEBUG_CRIT,(__location__ " bad ltdb record in indata\n")); + talloc_free(records); + return -1; + } + + /* If we can't delete the record we must add it to the reply + so the lmaster knows it may not purge this record + */ + if (delete_tdb_record(ctdb, ctdb_db, rec) != 0) { + size_t old_size; + struct ctdb_ltdb_header *hdr; + + hdr = (struct ctdb_ltdb_header *)data.dptr; + data.dptr += sizeof(*hdr); + data.dsize -= sizeof(*hdr); + + DEBUG(DEBUG_INFO, (__location__ " Failed to vacuum delete record with hash 0x%08x\n", ctdb_hash(&key))); + + old_size = talloc_get_size(records); + records = talloc_realloc_size(outdata, records, old_size + rec->length); + if (records == NULL) { + DEBUG(DEBUG_ERR,(__location__ " Failed to expand\n")); + return -1; + } + records->count++; + memcpy(old_size+(uint8_t *)records, rec, rec->length); + } + + rec = (struct ctdb_rec_data_old *)(rec->length + (uint8_t *)rec); + } + + + *outdata = ctdb_marshall_finish(records); + + return 0; +} + +/* + report capabilities + */ +int32_t ctdb_control_get_capabilities(struct ctdb_context *ctdb, TDB_DATA *outdata) +{ + uint32_t *capabilities = NULL; + + capabilities = talloc(outdata, uint32_t); + CTDB_NO_MEMORY(ctdb, capabilities); + *capabilities = ctdb->capabilities; + + outdata->dsize = sizeof(uint32_t); + outdata->dptr = (uint8_t *)capabilities; + + return 0; +} + +/* The recovery daemon will ping us at regular intervals. + If we haven't been pinged for a while we assume the recovery + daemon is inoperable and we restart. +*/ +static void ctdb_recd_ping_timeout(struct tevent_context *ev, + struct tevent_timer *te, + struct timeval t, void *p) +{ + struct ctdb_context *ctdb = talloc_get_type(p, struct ctdb_context); + uint32_t *count = talloc_get_type(ctdb->recd_ping_count, uint32_t); + + DEBUG(DEBUG_ERR, ("Recovery daemon ping timeout. Count : %u\n", *count)); + + if (*count < ctdb->tunable.recd_ping_failcount) { + (*count)++; + tevent_add_timer(ctdb->ev, ctdb->recd_ping_count, + timeval_current_ofs(ctdb->tunable.recd_ping_timeout, 0), + ctdb_recd_ping_timeout, ctdb); + return; + } + + DEBUG(DEBUG_ERR, ("Final timeout for recovery daemon ping. Restarting recovery daemon. (This can be caused if the cluster filesystem has hung)\n")); + + ctdb_stop_recoverd(ctdb); + ctdb_start_recoverd(ctdb); +} + +int32_t ctdb_control_recd_ping(struct ctdb_context *ctdb) +{ + talloc_free(ctdb->recd_ping_count); + + ctdb->recd_ping_count = talloc_zero(ctdb, uint32_t); + CTDB_NO_MEMORY(ctdb, ctdb->recd_ping_count); + + if (ctdb->tunable.recd_ping_timeout != 0) { + tevent_add_timer(ctdb->ev, ctdb->recd_ping_count, + timeval_current_ofs(ctdb->tunable.recd_ping_timeout, 0), + ctdb_recd_ping_timeout, ctdb); + } + + return 0; +} + +void ctdb_node_become_inactive(struct ctdb_context *ctdb) +{ + struct ctdb_db_context *ctdb_db; + + D_WARNING("Making node INACTIVE\n"); + + /* + * Do not service database calls - reset generation to invalid + * so this node ignores any REQ/REPLY CALL/DMASTER + */ + ctdb->vnn_map->generation = INVALID_GENERATION; + for (ctdb_db = ctdb->db_list; ctdb_db != NULL; ctdb_db = ctdb_db->next) { + ctdb_db->generation = INVALID_GENERATION; + } + + /* + * Although this bypasses the control, the only thing missing + * is the deferred drop of all public IPs, which isn't + * necessary because they are dropped below + */ + if (ctdb->recovery_mode != CTDB_RECOVERY_ACTIVE) { + D_NOTICE("Recovery mode set to ACTIVE\n"); + ctdb->recovery_mode = CTDB_RECOVERY_ACTIVE; + } + + /* + * Initiate database freeze - this will be scheduled for + * immediate execution and will be in progress long before the + * calling control returns + */ + ctdb_daemon_send_control(ctdb, + ctdb->pnn, + 0, + CTDB_CONTROL_FREEZE, + 0, + CTDB_CTRL_FLAG_NOREPLY, + tdb_null, + NULL, + NULL); + + D_NOTICE("Dropping all public IP addresses\n"); + ctdb_release_all_ips(ctdb); +} + +int32_t ctdb_control_stop_node(struct ctdb_context *ctdb) +{ + DEBUG(DEBUG_ERR, ("Stopping node\n")); + ctdb->nodes[ctdb->pnn]->flags |= NODE_FLAGS_STOPPED; + + ctdb_node_become_inactive(ctdb); + + return 0; +} + +int32_t ctdb_control_continue_node(struct ctdb_context *ctdb) +{ + DEBUG(DEBUG_ERR, ("Continue node\n")); + ctdb->nodes[ctdb->pnn]->flags &= ~NODE_FLAGS_STOPPED; + + return 0; +} + |