--- /dev/null
+/*
+ ctdb ltdb code
+
+ Copyright (C) Andrew Tridgell 2006
+ Copyright (C) Ronnie sahlberg 2011
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "includes.h"
+#include "lib/tevent/tevent.h"
+#include "lib/tdb/include/tdb.h"
+#include "system/network.h"
+#include "system/filesys.h"
+#include "../include/ctdb_private.h"
+#include "db_wrap.h"
+#include "lib/util/dlinklist.h"
+
+/*
+ find an attached ctdb_db handle given a name
+ */
+struct ctdb_db_context *ctdb_db_handle(struct ctdb_context *ctdb, const char *name)
+{
+ struct ctdb_db_context *tmp_db;
+ for (tmp_db=ctdb->db_list;tmp_db;tmp_db=tmp_db->next) {
+ if (strcmp(name, tmp_db->db_name) == 0) {
+ return tmp_db;
+ }
+ }
+ return NULL;
+}
+
+
+/*
+ return the lmaster given a key
+*/
+uint32_t ctdb_lmaster(struct ctdb_context *ctdb, const TDB_DATA *key)
+{
+ uint32_t idx, lmaster;
+
+ idx = ctdb_hash(key) % ctdb->vnn_map->size;
+ lmaster = ctdb->vnn_map->map[idx];
+
+ return lmaster;
+}
+
+
+/*
+ construct an initial header for a record with no ltdb header yet
+*/
+static void ltdb_initial_header(struct ctdb_db_context *ctdb_db,
+ TDB_DATA key,
+ struct ctdb_ltdb_header *header)
+{
+ ZERO_STRUCTP(header);
+ /* initial dmaster is the lmaster */
+ header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
+ header->flags = CTDB_REC_FLAG_AUTOMATIC;
+}
+
+
+/*
+ fetch a record from the ltdb, separating out the header information
+ and returning the body of the record. A valid (initial) header is
+ returned if the record is not present
+*/
+int ctdb_ltdb_fetch(struct ctdb_db_context *ctdb_db,
+ TDB_DATA key, struct ctdb_ltdb_header *header,
+ TALLOC_CTX *mem_ctx, TDB_DATA *data)
+{
+ TDB_DATA rec;
+ struct ctdb_context *ctdb = ctdb_db->ctdb;
+
+ rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ if (rec.dsize < sizeof(*header)) {
+ TDB_DATA d2;
+ /* return an initial header */
+ if (rec.dptr) free(rec.dptr);
+ if (ctdb->vnn_map == NULL) {
+ /* called from the client */
+ ZERO_STRUCTP(data);
+ header->dmaster = (uint32_t)-1;
+ return -1;
+ }
+ ltdb_initial_header(ctdb_db, key, header);
+ ZERO_STRUCT(d2);
+ if (data) {
+ *data = d2;
+ }
+ ctdb_ltdb_store(ctdb_db, key, header, d2);
+ return 0;
+ }
+
+ *header = *(struct ctdb_ltdb_header *)rec.dptr;
+
+ if (data) {
+ data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
+ data->dptr = talloc_memdup(mem_ctx,
+ sizeof(struct ctdb_ltdb_header)+rec.dptr,
+ data->dsize);
+ }
+
+ free(rec.dptr);
+ if (data) {
+ CTDB_NO_MEMORY(ctdb, data->dptr);
+ }
+
+ return 0;
+}
+
+/*
+ fetch a record from the ltdb, separating out the header information
+ and returning the body of the record.
+ if the record does not exist, *header will be NULL
+ and data = {0, NULL}
+*/
+int ctdb_ltdb_fetch_with_header(struct ctdb_db_context *ctdb_db,
+ TDB_DATA key, struct ctdb_ltdb_header *header,
+ TALLOC_CTX *mem_ctx, TDB_DATA *data)
+{
+ TDB_DATA rec;
+
+ rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ if (rec.dsize < sizeof(*header)) {
+ free(rec.dptr);
+
+ data->dsize = 0;
+ data->dptr = NULL;
+ return -1;
+ }
+
+ *header = *(struct ctdb_ltdb_header *)rec.dptr;
+ if (data) {
+ data->dsize = rec.dsize - sizeof(struct ctdb_ltdb_header);
+ data->dptr = talloc_memdup(mem_ctx,
+ sizeof(struct ctdb_ltdb_header)+rec.dptr,
+ data->dsize);
+ }
+
+ free(rec.dptr);
+
+ return 0;
+}
+
+
+/*
+ write a record to a normal database
+*/
+int ctdb_ltdb_store(struct ctdb_db_context *ctdb_db, TDB_DATA key,
+ struct ctdb_ltdb_header *header, TDB_DATA data)
+{
+ struct ctdb_context *ctdb = ctdb_db->ctdb;
+ TDB_DATA rec;
+ int ret;
+ bool seqnum_suppressed = false;
+
+ if (ctdb_db->ctdb_ltdb_store_fn) {
+ return ctdb_db->ctdb_ltdb_store_fn(ctdb_db, key, header, data);
+ }
+
+ if (ctdb->flags & CTDB_FLAG_TORTURE) {
+ struct ctdb_ltdb_header *h2;
+ rec = tdb_fetch(ctdb_db->ltdb->tdb, key);
+ h2 = (struct ctdb_ltdb_header *)rec.dptr;
+ if (rec.dptr && rec.dsize >= sizeof(h2) && h2->rsn > header->rsn) {
+ DEBUG(DEBUG_CRIT,("RSN regression! %llu %llu\n",
+ (unsigned long long)h2->rsn, (unsigned long long)header->rsn));
+ }
+ if (rec.dptr) free(rec.dptr);
+ }
+
+ rec.dsize = sizeof(*header) + data.dsize;
+ rec.dptr = talloc_size(ctdb, rec.dsize);
+ CTDB_NO_MEMORY(ctdb, rec.dptr);
+
+ memcpy(rec.dptr, header, sizeof(*header));
+ memcpy(rec.dptr + sizeof(*header), data.dptr, data.dsize);
+
+ /* Databases with seqnum updates enabled only get their seqnum
+ changes when/if we modify the data */
+ if (ctdb_db->seqnum_update != NULL) {
+ TDB_DATA old;
+ old = tdb_fetch(ctdb_db->ltdb->tdb, key);
+
+ if ( (old.dsize == rec.dsize)
+ && !memcmp(old.dptr+sizeof(struct ctdb_ltdb_header),
+ rec.dptr+sizeof(struct ctdb_ltdb_header),
+ rec.dsize-sizeof(struct ctdb_ltdb_header)) ) {
+ tdb_remove_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
+ seqnum_suppressed = true;
+ }
+ if (old.dptr) free(old.dptr);
+ }
+ ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
+ if (ret != 0) {
+ DEBUG(DEBUG_ERR, (__location__ " Failed to store dynamic data\n"));
+ }
+ if (seqnum_suppressed) {
+ tdb_add_flags(ctdb_db->ltdb->tdb, TDB_SEQNUM);
+ }
+
+ talloc_free(rec.dptr);
+
+ return ret;
+}
+
+/*
+ lock a record in the ltdb, given a key
+ */
+int ctdb_ltdb_lock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
+{
+ return tdb_chainlock(ctdb_db->ltdb->tdb, key);
+}
+
+/*
+ unlock a record in the ltdb, given a key
+ */
+int ctdb_ltdb_unlock(struct ctdb_db_context *ctdb_db, TDB_DATA key)
+{
+ int ret = tdb_chainunlock(ctdb_db->ltdb->tdb, key);
+ if (ret != 0) {
+ DEBUG(DEBUG_ERR,("tdb_chainunlock failed on db %s [%s]\n", ctdb_db->db_name, tdb_errorstr(ctdb_db->ltdb->tdb)));
+ }
+ return ret;
+}
+
+
+/*
+ delete a record from a normal database
+*/
+int ctdb_ltdb_delete(struct ctdb_db_context *ctdb_db, TDB_DATA key)
+{
+ if (ctdb_db->persistent != 0) {
+ DEBUG(DEBUG_ERR,("Trying to delete emty record in persistent database\n"));
+ return 0;
+ }
+ if (tdb_delete(ctdb_db->ltdb->tdb, key) != 0) {
+ DEBUG(DEBUG_ERR,("Failed to delete empty record."));
+ return -1;
+ }
+ return 0;
+}
+
+int ctdb_trackingdb_add_pnn(struct ctdb_context *ctdb, TDB_DATA *data, uint32_t pnn)
+{
+ int byte_pos = pnn / 8;
+ int bit_mask = 1 << (pnn % 8);
+
+ if (byte_pos + 1 > data->dsize) {
+ char *buf;
+
+ buf = malloc(byte_pos + 1);
+ memset(buf, 0, byte_pos + 1);
+ if (buf == NULL) {
+ DEBUG(DEBUG_ERR, ("Out of memory when allocating buffer of %d bytes for trackingdb\n", byte_pos + 1));
+ return -1;
+ }
+ if (data->dptr != NULL) {
+ memcpy(buf, data->dptr, data->dsize);
+ free(data->dptr);
+ }
+ data->dptr = (uint8_t *)buf;
+ data->dsize = byte_pos + 1;
+ }
+
+ data->dptr[byte_pos] |= bit_mask;
+ return 0;
+}
+
+void ctdb_trackingdb_traverse(struct ctdb_context *ctdb, TDB_DATA data, ctdb_trackingdb_cb cb, void *private_data)
+{
+ int i;
+
+ for(i = 0; i < data.dsize; i++) {
+ int j;
+
+ for (j=0; j<8; j++) {
+ int mask = 1<<j;
+
+ if (data.dptr[i] & mask) {
+ cb(ctdb, i * 8 + j, private_data);
+ }
+ }
+ }
+}
+
+
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