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/*
ctdb ltdb code
Copyright (C) Andrew Tridgell 2006
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/events/events.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)
{
header->rsn = 0;
/* initial dmaster is the lmaster */
header->dmaster = ctdb_lmaster(ctdb_db->ctdb, &key);
header->laccessor = header->dmaster;
header->lacount = 0;
}
/*
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. A valid (initial) header is
returned if the record is not present
*/
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;
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(0,("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);
ret = tdb_store(ctdb_db->ltdb->tdb, key, rec, TDB_REPLACE);
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(0,("tdb_chainunlock failed\n"));
}
return ret;
}
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