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"
38 * Calculate tdb flags based on databse type
40 int ctdb_db_tdb_flags(uint8_t db_flags, bool with_valgrind, bool with_mutex)
44 if (db_flags & CTDB_DB_FLAGS_PERSISTENT) {
45 tdb_flags = TDB_DEFAULT;
47 tdb_flags = TDB_NOSYNC |
49 TDB_INCOMPATIBLE_HASH;
51 #ifdef TDB_MUTEX_LOCKING
52 if (with_mutex && tdb_runtime_check_for_robust_mutexes()) {
53 tdb_flags |= TDB_MUTEX_LOCKING;
59 tdb_flags |= TDB_DISALLOW_NESTING;
61 tdb_flags |= TDB_NOMMAP;
68 find an attached ctdb_db handle given a name
70 struct ctdb_db_context *ctdb_db_handle(struct ctdb_context *ctdb, const char *name)
72 struct ctdb_db_context *tmp_db;
73 for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
74 if (strcmp(name, tmp_db->db_name) == 0) {
83 return the lmaster given a key
85 uint32_t ctdb_lmaster(struct ctdb_context *ctdb, const TDB_DATA *key)
87 uint32_t idx, lmaster;
89 idx = ctdb_hash(key) % ctdb->vnn_map->size;
90 lmaster = ctdb->vnn_map->map[idx];
97 construct an initial header for a record with no ltdb header yet
99 static void ltdb_initial_header(struct ctdb_db_context *ctdb_db,
101 struct ctdb_ltdb_header *header)
103 ZERO_STRUCTP(header);
104 /* initial dmaster is the lmaster */
105 header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
106 header->flags = CTDB_REC_FLAG_AUTOMATIC;
111 fetch a record from the ltdb, separating out the header information
112 and returning the body of the record. A valid (initial) header is
113 returned if the record is not present
115 int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
116 TDB_DATA key, struct ctdb_ltdb_header *header,
117 TALLOC_CTX *mem_ctx, TDB_DATA *data)
120 struct ctdb_context *ctdb = ctdb_db->ctdb;
122 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
123 if (rec.dsize < sizeof(*header)) {
124 /* return an initial header */
125 if (rec.dptr) free(rec.dptr);
126 if (ctdb->vnn_map == NULL) {
127 /* called from the client */
129 header->dmaster = (uint32_t)-1;
132 ltdb_initial_header(ctdb_db, key, header);
136 if (ctdb_db->persistent || header->dmaster == ctdb_db->ctdb->pnn) {
137 if (ctdb_ltdb_store(ctdb_db, key, header, tdb_null) != 0) {
139 (__location__ "failed to store initial header\n"));
145 *header = *(struct ctdb_ltdb_header *)rec.dptr;
148 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
149 data->dptr = talloc_memdup(mem_ctx,
150 sizeof(struct ctdb_ltdb_header)+rec.dptr,
156 CTDB_NO_MEMORY(ctdb, data->dptr);
163 fetch a record from the ltdb, separating out the header information
164 and returning the body of the record.
165 if the record does not exist, *header will be NULL
168 int ctdb_ltdb_fetch_with_header(struct ctdb_db_context *ctdb_db,
169 TDB_DATA key, struct ctdb_ltdb_header *header,
170 TALLOC_CTX *mem_ctx, TDB_DATA *data)
174 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
175 if (rec.dsize < sizeof(*header)) {
183 *header = *(struct ctdb_ltdb_header *)rec.dptr;
185 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
186 data->dptr = talloc_memdup(mem_ctx,
187 sizeof(struct ctdb_ltdb_header)+rec.dptr,
198 write a record to a normal database
200 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
201 struct ctdb_ltdb_header *header, TDB_DATA data)
203 struct ctdb_context *ctdb = ctdb_db->ctdb;
205 uint32_t hsize = sizeof(struct ctdb_ltdb_header);
207 bool seqnum_suppressed = false;
209 if (ctdb_db->ctdb_ltdb_store_fn) {
210 return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
213 if (ctdb->flags & CTDB_FLAG_TORTURE) {
215 struct ctdb_ltdb_header *h2;
217 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
218 h2 = (struct ctdb_ltdb_header *)old.dptr;
219 if (old.dptr != NULL && old.dsize >= hsize &&
220 h2->rsn > header->rsn) {
222 ("RSN regression! %"PRIu64" %"PRIu64"\n",
223 h2->rsn, header->rsn));
225 if (old.dptr != NULL) {
230 rec[0].dsize = hsize;
231 rec[0].dptr = (uint8_t *)header;
233 rec[1].dsize = data.dsize;
234 rec[1].dptr = data.dptr;
236 /* Databases with seqnum updates enabled only get their seqnum
237 changes when/if we modify the data */
238 if (ctdb_db->seqnum_update != NULL) {
240 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
242 if ((old.dsize == hsize + data.dsize) &&
243 memcmp(old.dptr+hsize, data.dptr, data.dsize) == 0) {
244 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
245 seqnum_suppressed = true;
247 if (old.dptr != NULL) {
251 ret = tdb_storev(ctdb_db->ltdb->tdb, key, rec, 2, TDB_REPLACE);
253 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
255 if (seqnum_suppressed) {
256 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
263 lock a record in the ltdb, given a key
265 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
267 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
271 unlock a record in the ltdb, given a key
273 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
275 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
277 DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
284 delete a record from a normal database
286 int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
288 if (ctdb_db->persistent != 0) {
289 DEBUG(DEBUG_ERR,("Trying to delete empty record in persistent database\n"));
292 if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
293 DEBUG(DEBUG_ERR,("Failed to delete empty record."));
299 int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
301 int byte_pos = pnn / 8;
302 int bit_mask = 1 << (pnn % 8);
304 if (byte_pos + 1 > data->dsize) {
307 buf = malloc(byte_pos + 1);
308 memset(buf, 0, byte_pos + 1);
310 DEBUG(DEBUG_ERR, ("Out of memory when allocating buffer of %d bytes for trackingdb\n", byte_pos + 1));
313 if (data->dptr != NULL) {
314 memcpy(buf, data->dptr, data->dsize);
317 data->dptr = (uint8_t *)buf;
318 data->dsize = byte_pos + 1;
321 data->dptr[byte_pos] |= bit_mask;
325 void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
329 for(i = 0; i < data.dsize; i++) {
332 for (j=0; j<8; j++) {
335 if (data.dptr[i] & mask) {
336 cb(ctdb, i * 8 + j, private_data);
343 this is the dummy null procedure that all databases support
345 int ctdb_null_func(struct ctdb_call_info *call)
351 this is a plain fetch procedure that all databases support
353 int ctdb_fetch_func(struct ctdb_call_info *call)
355 call->reply_data = &call->record_data;
360 this is a plain fetch procedure that all databases support
361 this returns the full record including the ltdb header
363 int ctdb_fetch_with_header_func(struct ctdb_call_info *call)
365 call->reply_data = talloc(call, TDB_DATA);
366 if (call->reply_data == NULL) {
369 call->reply_data->dsize = sizeof(struct ctdb_ltdb_header) + call->record_data.dsize;
370 call->reply_data->dptr = talloc_size(call->reply_data, call->reply_data->dsize);
371 if (call->reply_data->dptr == NULL) {
374 memcpy(call->reply_data->dptr, call->header, sizeof(struct ctdb_ltdb_header));
375 memcpy(&call->reply_data->dptr[sizeof(struct ctdb_ltdb_header)], call->record_data.dptr, call->record_data.dsize);