4 Copyright (C) Andrew Tridgell 2006
5 Copyright (C) Ronnie sahlberg 2011
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, see <http://www.gnu.org/licenses/>.
22 #include "system/network.h"
23 #include "system/filesys.h"
27 #include "lib/tdb_wrap/tdb_wrap.h"
28 #include "lib/util/dlinklist.h"
29 #include "lib/util/debug.h"
31 #include "ctdb_private.h"
33 #include "common/common.h"
34 #include "common/logging.h"
37 find an attached ctdb_db handle given a name
39 struct ctdb_db_context *ctdb_db_handle(struct ctdb_context *ctdb, const char *name)
41 struct ctdb_db_context *tmp_db;
42 for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
43 if (strcmp(name, tmp_db->db_name) == 0) {
52 return the lmaster given a key
54 uint32_t ctdb_lmaster(struct ctdb_context *ctdb, const TDB_DATA *key)
56 uint32_t idx, lmaster;
58 idx = ctdb_hash(key) % ctdb->vnn_map->size;
59 lmaster = ctdb->vnn_map->map[idx];
66 construct an initial header for a record with no ltdb header yet
68 static void ltdb_initial_header(struct ctdb_db_context *ctdb_db,
70 struct ctdb_ltdb_header *header)
73 /* initial dmaster is the lmaster */
74 header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
75 header->flags = CTDB_REC_FLAG_AUTOMATIC;
80 fetch a record from the ltdb, separating out the header information
81 and returning the body of the record. A valid (initial) header is
82 returned if the record is not present
84 int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
85 TDB_DATA key, struct ctdb_ltdb_header *header,
86 TALLOC_CTX *mem_ctx, TDB_DATA *data)
89 struct ctdb_context *ctdb = ctdb_db->ctdb;
91 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
92 if (rec.dsize < sizeof(*header)) {
93 /* return an initial header */
94 if (rec.dptr) free(rec.dptr);
95 if (ctdb->vnn_map == NULL) {
96 /* called from the client */
98 header->dmaster = (uint32_t)-1;
101 ltdb_initial_header(ctdb_db, key, header);
105 if (ctdb_db->persistent || header->dmaster == ctdb_db->ctdb->pnn) {
106 if (ctdb_ltdb_store(ctdb_db, key, header, tdb_null) != 0) {
108 (__location__ "failed to store initial header\n"));
114 *header = *(struct ctdb_ltdb_header *)rec.dptr;
117 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
118 data->dptr = talloc_memdup(mem_ctx,
119 sizeof(struct ctdb_ltdb_header)+rec.dptr,
125 CTDB_NO_MEMORY(ctdb, data->dptr);
132 fetch a record from the ltdb, separating out the header information
133 and returning the body of the record.
134 if the record does not exist, *header will be NULL
137 int ctdb_ltdb_fetch_with_header(struct ctdb_db_context *ctdb_db,
138 TDB_DATA key, struct ctdb_ltdb_header *header,
139 TALLOC_CTX *mem_ctx, TDB_DATA *data)
143 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
144 if (rec.dsize < sizeof(*header)) {
152 *header = *(struct ctdb_ltdb_header *)rec.dptr;
154 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
155 data->dptr = talloc_memdup(mem_ctx,
156 sizeof(struct ctdb_ltdb_header)+rec.dptr,
167 write a record to a normal database
169 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
170 struct ctdb_ltdb_header *header, TDB_DATA data)
172 struct ctdb_context *ctdb = ctdb_db->ctdb;
175 bool seqnum_suppressed = false;
177 if (ctdb_db->ctdb_ltdb_store_fn) {
178 return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
181 if (ctdb->flags & CTDB_FLAG_TORTURE) {
182 struct ctdb_ltdb_header *h2;
183 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
184 h2 = (struct ctdb_ltdb_header *)rec.dptr;
185 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
186 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
187 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
189 if (rec.dptr) free(rec.dptr);
192 rec.dsize = sizeof(*header) + data.dsize;
193 rec.dptr = talloc_size(ctdb, rec.dsize);
194 CTDB_NO_MEMORY(ctdb, rec.dptr);
196 memcpy(rec.dptr, header, sizeof(*header));
197 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
199 /* Databases with seqnum updates enabled only get their seqnum
200 changes when/if we modify the data */
201 if (ctdb_db->seqnum_update != NULL) {
203 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
205 if ( (old.dsize == rec.dsize)
206 && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
207 rec.dptr+sizeof(struct ctdb_ltdb_header),
208 rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
209 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
210 seqnum_suppressed = true;
212 if (old.dptr) free(old.dptr);
214 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
216 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
218 if (seqnum_suppressed) {
219 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
222 talloc_free(rec.dptr);
228 lock a record in the ltdb, given a key
230 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
232 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
236 unlock a record in the ltdb, given a key
238 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
240 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
242 DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
249 delete a record from a normal database
251 int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
253 if (ctdb_db->persistent != 0) {
254 DEBUG(DEBUG_ERR,("Trying to delete emty record in persistent database\n"));
257 if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
258 DEBUG(DEBUG_ERR,("Failed to delete empty record."));
264 int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
266 int byte_pos = pnn / 8;
267 int bit_mask = 1 << (pnn % 8);
269 if (byte_pos + 1 > data->dsize) {
272 buf = malloc(byte_pos + 1);
273 memset(buf, 0, byte_pos + 1);
275 DEBUG(DEBUG_ERR, ("Out of memory when allocating buffer of %d bytes for trackingdb\n", byte_pos + 1));
278 if (data->dptr != NULL) {
279 memcpy(buf, data->dptr, data->dsize);
282 data->dptr = (uint8_t *)buf;
283 data->dsize = byte_pos + 1;
286 data->dptr[byte_pos] |= bit_mask;
290 void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
294 for(i = 0; i < data.dsize; i++) {
297 for (j=0; j<8; j++) {
300 if (data.dptr[i] & mask) {
301 cb(ctdb, i * 8 + j, private_data);
308 this is the dummy null procedure that all databases support
310 int ctdb_null_func(struct ctdb_call_info *call)
316 this is a plain fetch procedure that all databases support
318 int ctdb_fetch_func(struct ctdb_call_info *call)
320 call->reply_data = &call->record_data;
325 this is a plain fetch procedure that all databases support
326 this returns the full record including the ltdb header
328 int ctdb_fetch_with_header_func(struct ctdb_call_info *call)
330 call->reply_data = talloc(call, TDB_DATA);
331 if (call->reply_data == NULL) {
334 call->reply_data->dsize = sizeof(struct ctdb_ltdb_header) + call->record_data.dsize;
335 call->reply_data->dptr = talloc_size(call->reply_data, call->reply_data->dsize);
336 if (call->reply_data->dptr == NULL) {
339 memcpy(call->reply_data->dptr, call->header, sizeof(struct ctdb_ltdb_header));
340 memcpy(&call->reply_data->dptr[sizeof(struct ctdb_ltdb_header)], call->record_data.dptr, call->record_data.dsize);