4 Copyright (C) Andrew Tridgell 2006
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.
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.
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/>.
21 #include "lib/events/events.h"
22 #include "lib/tdb/include/tdb.h"
23 #include "system/network.h"
24 #include "system/filesys.h"
25 #include "../include/ctdb_private.h"
27 #include "lib/util/dlinklist.h"
30 find an attached ctdb_db handle given a name
32 struct ctdb_db_context *ctdb_db_handle(struct ctdb_context *ctdb, const char *name)
34 struct ctdb_db_context *tmp_db;
35 for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
36 if (strcmp(name, tmp_db->db_name) == 0) {
45 return the lmaster given a key
47 uint32_t ctdb_lmaster(struct ctdb_context *ctdb, const TDB_DATA *key)
49 uint32_t idx, lmaster;
51 idx = ctdb_hash(key) % ctdb->vnn_map->size;
52 lmaster = ctdb->vnn_map->map[idx];
59 construct an initial header for a record with no ltdb header yet
61 static void ltdb_initial_header(struct ctdb_db_context *ctdb_db,
63 struct ctdb_ltdb_header *header)
66 /* initial dmaster is the lmaster */
67 header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
68 header->laccessor = header->dmaster;
74 fetch a record from the ltdb, separating out the header information
75 and returning the body of the record. A valid (initial) header is
76 returned if the record is not present
78 int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
79 TDB_DATA key, struct ctdb_ltdb_header *header,
80 TALLOC_CTX *mem_ctx, TDB_DATA *data)
83 struct ctdb_context *ctdb = ctdb_db->ctdb;
85 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
86 if (rec.dsize < sizeof(*header)) {
88 /* return an initial header */
89 if (rec.dptr) free(rec.dptr);
90 if (ctdb->vnn_map == NULL) {
91 /* called from the client */
93 header->dmaster = (uint32_t)-1;
96 ltdb_initial_header(ctdb_db, key, header);
101 ctdb_ltdb_store(ctdb_db, key, header, d2);
105 *header = *(struct ctdb_ltdb_header *)rec.dptr;
108 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
109 data->dptr = talloc_memdup(mem_ctx,
110 sizeof(struct ctdb_ltdb_header)+rec.dptr,
116 CTDB_NO_MEMORY(ctdb, data->dptr);
124 write a record to a normal database
126 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
127 struct ctdb_ltdb_header *header, TDB_DATA data)
129 struct ctdb_context *ctdb = ctdb_db->ctdb;
133 if (ctdb->flags & CTDB_FLAG_TORTURE) {
134 struct ctdb_ltdb_header *h2;
135 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
136 h2 = (struct ctdb_ltdb_header *)rec.dptr;
137 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
138 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
139 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
141 if (rec.dptr) free(rec.dptr);
144 rec.dsize = sizeof(*header) + data.dsize;
145 rec.dptr = talloc_size(ctdb, rec.dsize);
146 CTDB_NO_MEMORY(ctdb, rec.dptr);
148 memcpy(rec.dptr, header, sizeof(*header));
149 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
151 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
153 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
156 talloc_free(rec.dptr);
162 write a record to a persistent database
163 at this stage the the record is locked by a lockwait child.
165 int ctdb_ltdb_persistent_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
166 struct ctdb_ltdb_header *header, TDB_DATA data)
168 struct ctdb_context *ctdb = ctdb_db->ctdb;
172 if (ctdb->flags & CTDB_FLAG_TORTURE) {
173 struct ctdb_ltdb_header *h2;
174 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
175 h2 = (struct ctdb_ltdb_header *)rec.dptr;
176 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
177 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
178 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
180 if (rec.dptr) free(rec.dptr);
183 rec.dsize = sizeof(*header) + data.dsize;
184 rec.dptr = talloc_size(ctdb, rec.dsize);
185 CTDB_NO_MEMORY(ctdb, rec.dptr);
187 memcpy(rec.dptr, header, sizeof(*header));
188 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
190 /* if this is a persistent database without NOSYNC then we
191 will do this via a transaction */
192 if (ctdb_db->persistent && !(ctdb_db->client_tdb_flags & TDB_NOSYNC)) {
193 ret = tdb_transaction_start(ctdb_db->ltdb->tdb);
195 DEBUG(DEBUG_ERR, (__location__ " Failed to start local transaction\n"));
198 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
200 DEBUG(DEBUG_ERR, (__location__ " Failed to store persistent data\n"));
201 tdb_transaction_cancel(ctdb_db->ltdb->tdb);
204 ret = tdb_transaction_commit(ctdb_db->ltdb->tdb);
206 DEBUG(DEBUG_ERR, (__location__ " Failed to commit persistent store transaction.\n"));
207 tdb_transaction_cancel(ctdb_db->ltdb->tdb);
211 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
215 talloc_free(rec.dptr);
221 lock a record in the ltdb, given a key
223 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
225 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
229 unlock a record in the ltdb, given a key
231 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
233 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
235 DEBUG(DEBUG_ERR,("tdb_chainunlock failed\n"));