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/>.
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->flags = CTDB_REC_FLAG_AUTOMATIC;
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 if (ctdb_db->persistent || header->dmaster == ctdb_db->ctdb->pnn) {
101 ctdb_ltdb_store(ctdb_db, key, header, d2);
106 *header = *(struct ctdb_ltdb_header *)rec.dptr;
109 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
110 data->dptr = talloc_memdup(mem_ctx,
111 sizeof(struct ctdb_ltdb_header)+rec.dptr,
117 CTDB_NO_MEMORY(ctdb, data->dptr);
124 fetch a record from the ltdb, separating out the header information
125 and returning the body of the record.
126 if the record does not exist, *header will be NULL
129 int ctdb_ltdb_fetch_with_header(struct ctdb_db_context *ctdb_db,
130 TDB_DATA key, struct ctdb_ltdb_header *header,
131 TALLOC_CTX *mem_ctx, TDB_DATA *data)
135 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
136 if (rec.dsize < sizeof(*header)) {
144 *header = *(struct ctdb_ltdb_header *)rec.dptr;
146 data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
147 data->dptr = talloc_memdup(mem_ctx,
148 sizeof(struct ctdb_ltdb_header)+rec.dptr,
159 write a record to a normal database
161 int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
162 struct ctdb_ltdb_header *header, TDB_DATA data)
164 struct ctdb_context *ctdb = ctdb_db->ctdb;
167 bool seqnum_suppressed = false;
169 if (ctdb_db->ctdb_ltdb_store_fn) {
170 return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
173 if (ctdb->flags & CTDB_FLAG_TORTURE) {
174 struct ctdb_ltdb_header *h2;
175 rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
176 h2 = (struct ctdb_ltdb_header *)rec.dptr;
177 if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
178 DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
179 (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
181 if (rec.dptr) free(rec.dptr);
184 rec.dsize = sizeof(*header) + data.dsize;
185 rec.dptr = talloc_size(ctdb, rec.dsize);
186 CTDB_NO_MEMORY(ctdb, rec.dptr);
188 memcpy(rec.dptr, header, sizeof(*header));
189 memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
191 /* Databases with seqnum updates enabled only get their seqnum
192 changes when/if we modify the data */
193 if (ctdb_db->seqnum_update != NULL) {
195 old = tdb_fetch(ctdb_db->ltdb->tdb, key);
197 if ( (old.dsize == rec.dsize)
198 && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
199 rec.dptr+sizeof(struct ctdb_ltdb_header),
200 rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
201 tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
202 seqnum_suppressed = true;
204 if (old.dptr) free(old.dptr);
206 ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
208 DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
210 if (seqnum_suppressed) {
211 tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
214 talloc_free(rec.dptr);
220 lock a record in the ltdb, given a key
222 int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
224 return tdb_chainlock(ctdb_db->ltdb->tdb, key);
228 unlock a record in the ltdb, given a key
230 int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
232 int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
234 DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
241 delete a record from a normal database
243 int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
245 if (ctdb_db->persistent != 0) {
246 DEBUG(DEBUG_ERR,("Trying to delete emty record in persistent database\n"));
249 if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
250 DEBUG(DEBUG_ERR,("Failed to delete empty record."));
256 int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
258 int byte_pos = pnn / 8;
259 int bit_mask = 1 << (pnn % 8);
261 if (byte_pos + 1 > data->dsize) {
264 buf = malloc(byte_pos + 1);
265 memset(buf, 0, byte_pos + 1);
267 DEBUG(DEBUG_ERR, ("Out of memory when allocating buffer of %d bytes for trackingdb\n", byte_pos + 1));
270 if (data->dptr != NULL) {
271 memcpy(buf, data->dptr, data->dsize);
274 data->dptr = (uint8_t *)buf;
275 data->dsize = byte_pos + 1;
278 data->dptr[byte_pos] |= bit_mask;
282 void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
286 for(i = 0; i < data.dsize; i++) {
289 for (j=0; j<8; j++) {
292 if (data.dptr[i] & mask) {
293 cb(ctdb, i * 8 + j, private_data);
300 this is the dummy null procedure that all databases support
302 int ctdb_null_func(struct ctdb_call_info *call)
308 this is a plain fetch procedure that all databases support
310 int ctdb_fetch_func(struct ctdb_call_info *call)
312 call->reply_data = &call->record_data;
317 this is a plain fetch procedure that all databases support
318 this returns the full record including the ltdb header
320 int ctdb_fetch_with_header_func(struct ctdb_call_info *call)
322 call->reply_data = talloc(call, TDB_DATA);
323 if (call->reply_data == NULL) {
326 call->reply_data->dsize = sizeof(struct ctdb_ltdb_header) + call->record_data.dsize;
327 call->reply_data->dptr = talloc_size(call->reply_data, call->reply_data->dsize);
328 if (call->reply_data->dptr == NULL) {
331 memcpy(call->reply_data->dptr, call->header, sizeof(struct ctdb_ltdb_header));
332 memcpy(&call->reply_data->dptr[sizeof(struct ctdb_ltdb_header)], call->record_data.dptr, call->record_data.dsize);