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/*
ctdb control tool - database vacuum
Copyright (C) Andrew Tridgell 2008
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 "system/filesys.h"
#include "system/network.h"
#include "../include/ctdb_client.h"
#include "../include/ctdb_private.h"
#include "../common/rb_tree.h"
#include "db_wrap.h"
/* should be tunable */
#define TIMELIMIT() timeval_current_ofs(10, 0)
struct vacuum_traverse_state {
bool error;
struct tdb_context *dest_db;
};
/*
traverse function for repacking
*/
static int repack_traverse(struct tdb_context *tdb, TDB_DATA key, TDB_DATA data, void *private)
{
struct vacuum_traverse_state *state = (struct vacuum_traverse_state *)private;
if (tdb_store(state->dest_db, key, data, TDB_INSERT) != 0) {
state->error = true;
return -1;
}
return 0;
}
/*
repack a tdb
*/
static int ctdb_repack_tdb(struct tdb_context *tdb)
{
struct tdb_context *tmp_db;
struct vacuum_traverse_state state;
if (tdb_transaction_start(tdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to start transaction\n"));
return -1;
}
tmp_db = tdb_open("tmpdb", tdb_hash_size(tdb),
TDB_INTERNAL|TDB_DISALLOW_NESTING,
O_RDWR|O_CREAT, 0);
if (tmp_db == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to create tmp_db\n"));
tdb_transaction_cancel(tdb);
return -1;
}
state.error = false;
state.dest_db = tmp_db;
if (tdb_traverse_read(tdb, repack_traverse, &state) == -1) {
DEBUG(DEBUG_ERR,(__location__ " Failed to traverse copying out\n"));
tdb_transaction_cancel(tdb);
tdb_close(tmp_db);
return -1;
}
if (state.error) {
DEBUG(DEBUG_ERR,(__location__ " Error during traversal\n"));
tdb_transaction_cancel(tdb);
tdb_close(tmp_db);
return -1;
}
if (tdb_wipe_all(tdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to wipe database\n"));
tdb_transaction_cancel(tdb);
tdb_close(tmp_db);
return -1;
}
state.error = false;
state.dest_db = tdb;
if (tdb_traverse_read(tmp_db, repack_traverse, &state) == -1) {
DEBUG(DEBUG_ERR,(__location__ " Failed to traverse copying back\n"));
tdb_transaction_cancel(tdb);
tdb_close(tmp_db);
return -1;
}
if (state.error) {
DEBUG(DEBUG_ERR,(__location__ " Error during second traversal\n"));
tdb_transaction_cancel(tdb);
tdb_close(tmp_db);
return -1;
}
tdb_close(tmp_db);
if (tdb_transaction_commit(tdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to commit\n"));
return -1;
}
return 0;
}
/* repack one database */
static int ctdb_repack_db(struct ctdb_context *ctdb, uint32_t db_id,
bool persistent, uint32_t repack_limit)
{
struct ctdb_db_context *ctdb_db;
const char *name;
int size;
if (ctdb_ctrl_getdbname(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, db_id, ctdb, &name) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to get name of db 0x%x\n", db_id));
return -1;
}
ctdb_db = ctdb_attach(ctdb, TIMELIMIT(), name, persistent, 0);
if (ctdb_db == NULL) {
DEBUG(DEBUG_ERR,(__location__ " Failed to attach to database '%s'\n", name));
return -1;
}
size = tdb_freelist_size(ctdb_db->ltdb->tdb);
if (size == -1) {
DEBUG(DEBUG_ERR,(__location__ " Failed to get freelist size for '%s'\n", name));
return -1;
}
if (size <= repack_limit) {
return 0;
}
printf("Repacking %s with %u freelist entries\n", name, size);
if (ctdb_repack_tdb(ctdb_db->ltdb->tdb) != 0) {
DEBUG(DEBUG_ERR,(__location__ " Failed to repack '%s'\n", name));
return -1;
}
return 0;
}
/*
repack all our databases
*/
int ctdb_repack(struct ctdb_context *ctdb, int argc, const char **argv)
{
struct ctdb_dbid_map *dbmap=NULL;
int ret, i;
/* a reasonable default limit to prevent us using too much memory */
uint32_t repack_limit = 10000;
if (argc > 0) {
repack_limit = atoi(argv[0]);
}
ret = ctdb_ctrl_getdbmap(ctdb, TIMELIMIT(), CTDB_CURRENT_NODE, ctdb, &dbmap);
if (ret != 0) {
DEBUG(DEBUG_ERR, ("Unable to get dbids from local node\n"));
return ret;
}
for (i=0;i<dbmap->num;i++) {
if (ctdb_repack_db(ctdb, dbmap->dbs[i].dbid,
dbmap->dbs[i].flags & CTDB_DB_FLAGS_PERSISTENT, repack_limit) != 0) {
DEBUG(DEBUG_ERR,("Failed to repack db 0x%x\n", dbmap->dbs[i].dbid));
return -1;
}
}
return 0;
}
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