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/tevent/tevent.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);
72 fetch a record from the ltdb, separating out the header information
73 and returning the body of the record. A valid (initial) header is
74 returned if the record is not present
76 int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
77 TDB_DATA key, struct ctdb_ltdb_header *header,
78 TALLOC_CTX *mem_ctx, TDB_DATA *data)
81 struct ctdb_context *ctdb = ctdb_db->ctdb;
83 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
84 if (rec.dsize < sizeof(*header)) {
86 /* return an initial header */
87 if (rec.dptr) free(rec.dptr);
88 if (ctdb->vnn_map == NULL) {
89 /* called from the client */
91 header->dmaster = (uint32_t)-1;
94 ltdb_initial_header(ctdb_db, key, header);
99 ctdb_ltdb_store(ctdb_db, key, header, d2);
103 *header = *(struct ctdb_ltdb_header *)rec.dptr;
106 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
107 data->dptr = talloc_memdup(mem_ctx,
108 sizeof(struct ctdb_ltdb_header)+rec.dptr,
114 CTDB_NO_MEMORY(ctdb, data->dptr);
122 write a record to a normal database
124 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
125 struct ctdb_ltdb_header *header, TDB_DATA data)
127 struct ctdb_context *ctdb = ctdb_db->ctdb;
130 bool seqnum_suppressed = false;
132 if (ctdb_db->ctdb_ltdb_store_fn) {
133 return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
136 if (ctdb->flags & CTDB_FLAG_TORTURE) {
137 struct ctdb_ltdb_header *h2;
138 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
139 h2 = (struct ctdb_ltdb_header *)rec.dptr;
140 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
141 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
142 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
144 if (rec.dptr) free(rec.dptr);
147 rec.dsize = sizeof(*header) + data.dsize;
148 rec.dptr = talloc_size(ctdb, rec.dsize);
149 CTDB_NO_MEMORY(ctdb, rec.dptr);
151 memcpy(rec.dptr, header, sizeof(*header));
152 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
154 /* Databases with seqnum updates enabled only get their seqnum
155 changes when/if we modify the data */
156 if (ctdb_db->seqnum_update != NULL) {
158 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
160 if ( (old.dsize == rec.dsize)
161 && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
162 rec.dptr+sizeof(struct ctdb_ltdb_header),
163 rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
164 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
165 seqnum_suppressed = true;
167 if (old.dptr) free(old.dptr);
169 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
171 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
173 if (seqnum_suppressed) {
174 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
177 talloc_free(rec.dptr);
183 lock a record in the ltdb, given a key
185 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
187 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
191 unlock a record in the ltdb, given a key
193 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
195 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
197 DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
204 delete a record from a normal database
206 int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
208 struct ctdb_context *ctdb = ctdb_db->ctdb;
210 if (ctdb_db->persistent != 0) {
211 DEBUG(DEBUG_ERR,("Trying to delete emty record in persistent database\n"));
214 if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
215 DEBUG(DEBUG_ERR,("Failed to delete empty record."));