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/*
Unix SMB/CIFS implementation.
Database interface wrapper around ctdbd
Copyright (C) Andrew Tridgell 2007
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/tdb/include/tdb.h"
#include "lib/dbwrap/dbwrap.h"
#include "cluster/cluster.h"
#include "cluster/ctdb/include/ctdb.h"
static NTSTATUS db_ctdb_store(struct db_record *rec, TDB_DATA data, int flag)
{
struct ctdb_record_handle *h = talloc_get_type(rec->private_data, struct ctdb_record_handle);
int ret;
ret = ctdb_record_store(h, data);
if (ret != 0) {
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
return NT_STATUS_OK;
}
static NTSTATUS db_ctdb_delete(struct db_record *rec)
{
return rec->store(rec, tdb_null, TDB_REPLACE);
}
static struct db_record *db_ctdb_fetch_locked(struct db_context *db,
TALLOC_CTX *mem_ctx,
TDB_DATA key)
{
struct db_record *rec;
struct ctdb_record_handle *h;
struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context);
rec = talloc(mem_ctx, struct db_record);
if (!rec) return NULL;
h = ctdb_fetch_lock(cdb, rec, key, &rec->value);
if (h == NULL) {
talloc_free(rec);
return NULL;
}
rec->private_data = h;
rec->store = db_ctdb_store;
rec->delete_rec = db_ctdb_delete;
return rec;
}
/*
fetch (unlocked, no migration) operation on ctdb
*/
static int db_ctdb_fetch(struct db_context *db, TALLOC_CTX *mem_ctx,
TDB_DATA key, TDB_DATA *data)
{
struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context);
return ctdb_fetch(cdb, mem_ctx, key, data);
}
struct traverse_state {
struct db_context *db;
int (*fn)(struct db_record *rec, void *private_data);
void *private_data;
};
static int traverse_callback(struct ctdb_context *ctdb, TDB_DATA key, TDB_DATA data, void *private_data)
{
struct traverse_state *state = (struct traverse_state *)private_data;
struct db_record *rec;
TALLOC_CTX *tmp_ctx = talloc_new(state->db);
/* we have to give them a locked record to prevent races */
rec = db_ctdb_fetch_locked(state->db, tmp_ctx, key);
if (rec && rec->value.dsize > 0) {
state->fn(rec, state->private_data);
}
talloc_free(tmp_ctx);
return 0;
}
static int db_ctdb_traverse(struct db_context *db,
int (*fn)(struct db_record *rec, void *private_data),
void *private_data)
{
struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context);
struct traverse_state state;
state.db = db;
state.fn = fn;
state.private_data = private_data;
ctdb_traverse(cdb, traverse_callback, &state);
return 0;
}
static NTSTATUS db_ctdb_store_deny(struct db_record *rec, TDB_DATA data, int flag)
{
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
static NTSTATUS db_ctdb_delete_deny(struct db_record *rec)
{
return NT_STATUS_MEDIA_WRITE_PROTECTED;
}
static int traverse_read_callback(struct ctdb_context *ctdb,
TDB_DATA key, TDB_DATA data, void *private_data)
{
struct traverse_state *state = (struct traverse_state *)private_data;
struct db_record rec;
rec.key = key;
rec.value = data;
rec.store = db_ctdb_store_deny;
rec.delete_rec = db_ctdb_delete_deny;
rec.private_data = state->db;
state->fn(&rec, state->private_data);
return 0;
}
static int db_ctdb_traverse_read(struct db_context *db,
int (*fn)(struct db_record *rec,
void *private_data),
void *private_data)
{
struct traverse_state state;
struct ctdb_db_context *cdb = talloc_get_type(db->private_data, struct ctdb_db_context);
state.db = db;
state.fn = fn;
state.private_data = private_data;
ctdb_traverse(cdb, traverse_read_callback, &state);
return 0;
}
static int db_ctdb_get_seqnum(struct db_context *db)
{
DEBUG(0,("ctdb_get_seqnum not implemented\n"));
return -1;
}
struct db_context *db_tmp_open_ctdb(TALLOC_CTX *mem_ctx, const char *name, int tdb_flags)
{
struct db_context *db;
struct ctdb_context *ctdb = talloc_get_type(cluster_backend_handle(),
struct ctdb_context);
struct ctdb_db_context *cdb;
db = talloc_zero(mem_ctx, struct db_context);
if (db == NULL) {
return NULL;
}
cdb = ctdb_attach(ctdb, name);
if (!cdb) {
DEBUG(0,("Failed to attach to ctdb database '%s'\n", name));
talloc_free(db);
return NULL;
}
db->private_data = cdb;
db->fetch_locked = db_ctdb_fetch_locked;
db->fetch = db_ctdb_fetch;
db->traverse = db_ctdb_traverse;
db->traverse_read = db_ctdb_traverse_read;
db->get_seqnum = db_ctdb_get_seqnum;
DEBUG(3,("db_tmp_open_ctdb: opened database '%s'\n", name));
return db;
}
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