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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 2001-2004
* Sleepycat Software. All rights reserved.
*
* $Id: db_truncate.c,v 11.201 2004/07/15 15:52:51 sue Exp $
*/
#include "db_config.h"
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <string.h>
#endif
#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/log.h"
#include "dbinc/btree.h"
#include "dbinc/hash.h"
#include "dbinc/qam.h"
#include "dbinc/txn.h"
static int __db_cursor_check __P((DB *));
/*
* __db_truncate_pp
* DB->truncate pre/post processing.
*
* PUBLIC: int __db_truncate_pp __P((DB *, DB_TXN *, u_int32_t *, u_int32_t));
*/
int
__db_truncate_pp(dbp, txn, countp, flags)
DB *dbp;
DB_TXN *txn;
u_int32_t *countp, flags;
{
DB_ENV *dbenv;
int handle_check, ret, txn_local;
dbenv = dbp->dbenv;
PANIC_CHECK(dbenv);
/* Check for invalid flags. */
if (F_ISSET(dbp, DB_AM_SECONDARY)) {
__db_err(dbenv,
"DBP->truncate forbidden on secondary indices");
return (EINVAL);
}
if ((ret =
__db_fchk(dbenv, "DB->truncate", flags, DB_AUTO_COMMIT)) != 0)
return (ret);
/*
* Make sure there are no active cursors on this db. Since we drop
* pages we cannot really adjust cursors.
*/
if (__db_cursor_check(dbp) != 0) {
__db_err(dbenv,
"DB->truncate not permitted with active cursors");
return (EINVAL);
}
/*
* Create local transaction as necessary, check for consistent
* transaction usage.
*/
txn_local = 0;
if (IS_AUTO_COMMIT(dbenv, txn, flags)) {
if ((ret = __db_txn_auto_init(dbenv, &txn)) != 0)
goto err;
txn_local = 1;
LF_CLR(DB_AUTO_COMMIT);
} else if (txn != NULL && !TXN_ON(dbenv)) {
ret = __db_not_txn_env(dbenv);
return (ret);
}
handle_check = IS_REPLICATED(dbenv, dbp);
if (handle_check && (ret = __db_rep_enter(dbp, 1, 0, txn != NULL)) != 0)
goto err;
ret = __db_truncate(dbp, txn, countp);
if (handle_check)
__env_db_rep_exit(dbenv);
err: return (txn_local ? __db_txn_auto_resolve(dbenv, txn, 0, ret) : ret);
}
/*
* __db_truncate
* DB->truncate.
*
* PUBLIC: int __db_truncate __P((DB *, DB_TXN *, u_int32_t *));
*/
int
__db_truncate(dbp, txn, countp)
DB *dbp;
DB_TXN *txn;
u_int32_t *countp;
{
DB *sdbp;
DBC *dbc;
DB_ENV *dbenv;
u_int32_t scount;
int ret, t_ret;
dbenv = dbp->dbenv;
dbc = NULL;
ret = 0;
/*
* Run through all secondaries and truncate them first. The count
* returned is the count of the primary only. QUEUE uses normal
* processing to truncate so it will update the secondaries normally.
*/
if (dbp->type != DB_QUEUE && LIST_FIRST(&dbp->s_secondaries) != NULL) {
for (sdbp = __db_s_first(dbp);
sdbp != NULL && ret == 0; ret = __db_s_next(&sdbp))
if ((ret = __db_truncate(sdbp, txn, &scount)) != 0)
break;
if (sdbp != NULL)
(void)__db_s_done(sdbp);
if (ret != 0)
return (ret);
}
DB_TEST_RECOVERY(dbp, DB_TEST_PREDESTROY, ret, NULL);
/* Acquire a cursor. */
if ((ret = __db_cursor(dbp, txn, &dbc, 0)) != 0)
return (ret);
DEBUG_LWRITE(dbc, txn, "DB->truncate", NULL, NULL, 0);
switch (dbp->type) {
case DB_BTREE:
case DB_RECNO:
ret = __bam_truncate(dbc, countp);
break;
case DB_HASH:
ret = __ham_truncate(dbc, countp);
break;
case DB_QUEUE:
ret = __qam_truncate(dbc, countp);
break;
case DB_UNKNOWN:
default:
ret = __db_unknown_type(dbenv, "DB->truncate", dbp->type);
break;
}
/* Discard the cursor. */
if (dbc != NULL && (t_ret = __db_c_close(dbc)) != 0 && ret == 0)
ret = t_ret;
DB_TEST_RECOVERY(dbp, DB_TEST_POSTDESTROY, ret, NULL);
DB_TEST_RECOVERY_LABEL
return (ret);
}
/*
* __db_cursor_check --
* See if there are any active cursors on this db.
*/
static int
__db_cursor_check(dbp)
DB *dbp;
{
DB *ldbp;
DBC *dbc;
DB_ENV *dbenv;
int found;
dbenv = dbp->dbenv;
MUTEX_THREAD_LOCK(dbenv, dbenv->dblist_mutexp);
for (found = 0, ldbp = __dblist_get(dbenv, dbp->adj_fileid);
ldbp != NULL && ldbp->adj_fileid == dbp->adj_fileid;
ldbp = LIST_NEXT(ldbp, dblistlinks)) {
MUTEX_THREAD_LOCK(dbenv, dbp->mutexp);
for (dbc = TAILQ_FIRST(&ldbp->active_queue);
dbc != NULL; dbc = TAILQ_NEXT(dbc, links)) {
if (IS_INITIALIZED(dbc)) {
found = 1;
break;
}
}
MUTEX_THREAD_UNLOCK(dbenv, dbp->mutexp);
if (found == 1)
break;
}
MUTEX_THREAD_UNLOCK(dbenv, dbenv->dblist_mutexp);
return (found);
}
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