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;
73 fetch a record from the ltdb, separating out the header information
74 and returning the body of the record. A valid (initial) header is
75 returned if the record is not present
77 int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
78 TDB_DATA key, struct ctdb_ltdb_header *header,
79 TALLOC_CTX *mem_ctx, TDB_DATA *data)
82 struct ctdb_context *ctdb = ctdb_db->ctdb;
84 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
85 if (rec.dsize < sizeof(*header)) {
87 /* return an initial header */
88 if (rec.dptr) free(rec.dptr);
89 if (ctdb->vnn_map == NULL) {
90 /* called from the client */
92 header->dmaster = (uint32_t)-1;
95 ltdb_initial_header(ctdb_db, key, header);
100 ctdb_ltdb_store(ctdb_db, key, header, d2);
104 *header = *(struct ctdb_ltdb_header *)rec.dptr;
107 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
108 data->dptr = talloc_memdup(mem_ctx,
109 sizeof(struct ctdb_ltdb_header)+rec.dptr,
115 CTDB_NO_MEMORY(ctdb, data->dptr);
123 write a record to a normal database
125 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
126 struct ctdb_ltdb_header *header, TDB_DATA data)
128 struct ctdb_context *ctdb = ctdb_db->ctdb;
131 bool seqnum_suppressed = false;
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 /* Databases with seqnum updates enabled only get their seqnum
152 changes when/if we modify the data */
153 if (ctdb_db->seqnum_update != NULL) {
155 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
157 if ( (old.dsize == rec.dsize)
158 && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
159 rec.dptr+sizeof(struct ctdb_ltdb_header),
160 rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
161 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
162 seqnum_suppressed = true;
164 if (old.dptr) free(old.dptr);
166 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
168 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
170 if (seqnum_suppressed) {
171 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
174 talloc_free(rec.dptr);
180 lock a record in the ltdb, given a key
182 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
184 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
188 unlock a record in the ltdb, given a key
190 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
192 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
194 DEBUG(DEBUG_ERR,("tdb_chainunlock failed\n"));