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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1998, 2012 Oracle and/or its affiliates. All rights reserved.
*
* $Id$
*/
#include "db_config.h"
#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/heap.h"
#include "dbinc/lock.h"
#include "dbinc/mp.h"
/*
* __heap_truncate --
* Truncate a database.
*
* PUBLIC: int __heap_truncate __P((DBC *, u_int32_t *));
*/
int
__heap_truncate(dbc, countp)
DBC *dbc;
u_int32_t *countp;
{
DB *dbp;
DB_LOCK lock, meta_lock;
DB_MPOOLFILE *mpf;
DBT log_dbt;
HEAPHDR *hdr;
HEAPMETA *meta;
HEAPPG *pg;
db_pgno_t pgno;
int i, ret, t_ret;
u_int32_t count, next_region, region_size;
LOCK_INIT(lock);
dbp = dbc->dbp;
mpf = dbp->mpf;
count = 0;
next_region = FIRST_HEAP_RPAGE;
region_size = HEAP_REGION_SIZE(dbp);
/* Traverse the entire database, starting with the metadata pg. */
pgno = PGNO_BASE_MD;
if ((ret = __db_lget(dbc,
LCK_ALWAYS, pgno, DB_LOCK_WRITE, 0, &meta_lock)) != 0)
return (ret);
if ((ret = __memp_fget(mpf, &pgno,
dbc->thread_info, dbc->txn, DB_MPOOL_DIRTY, &meta)) != 0) {
__TLPUT(dbc, lock);
goto err;
}
for (;;) {
pgno++;
if ((ret = __db_lget(dbc,
LCK_COUPLE, pgno, DB_LOCK_WRITE, 0, &lock)) != 0)
break;
if ((ret = __memp_fget(mpf, &pgno,
dbc->thread_info, dbc->txn, DB_MPOOL_DIRTY, &pg)) != 0) {
if (ret == DB_PAGE_NOTFOUND)
ret = 0;
break;
}
if (DBC_LOGGING(dbc)) {
memset(&log_dbt, 0, sizeof(DBT));
log_dbt.data = pg;
log_dbt.size = dbp->pgsize;
if ((ret = __heap_trunc_page_log(dbp, dbc->txn,
&LSN(pg), 0, pgno,
&log_dbt, (pgno == next_region), &LSN(pg))) != 0)
goto err;
} else
LSN_NOT_LOGGED(LSN(pg));
if (pgno == next_region) {
DB_ASSERT(dbp->env, TYPE(pg) == P_IHEAP);
next_region += region_size + 1;
} else {
/*
* We can't use pg->entries to calculate the record
* count, because it can include split records. So we
* check the header for each entry and only count
* non-split records and the first piece of split
* records. But if the page is empty, there's no work to
* do.
*/
if (NUM_ENT(pg) != 0)
for (i = 0; i <= HEAP_HIGHINDX(pg); i++) {
if (HEAP_OFFSETTBL(dbp, pg)[i] == 0)
continue;
hdr = (HEAPHDR *)P_ENTRY(dbp, pg, i);
if (!F_ISSET(hdr, HEAP_RECSPLIT) ||
F_ISSET(hdr, HEAP_RECFIRST))
count++;
}
}
if ((ret = __memp_fput(mpf,
dbc->thread_info, pg, dbc->priority)) != 0)
break;
if ((ret = __memp_fget(mpf, &pgno,
dbc->thread_info, dbc->txn, DB_MPOOL_FREE, &pg)) != 0)
break;
}
if ((t_ret = __TLPUT(dbc, lock)) != 0 && ret == 0)
ret = t_ret;
if (countp != NULL && ret == 0)
*countp = count;
if (DBC_LOGGING(dbc)) {
if ((ret = __heap_trunc_meta_log(dbp, dbc->txn, &LSN(meta), 0,
meta->dbmeta.pgno, meta->dbmeta.last_pgno,
meta->dbmeta.key_count, meta->dbmeta.record_count,
meta->curregion, meta->nregions, &LSN(meta))) != 0)
goto err;
} else
LSN_NOT_LOGGED(LSN(meta));
meta->dbmeta.key_count = 0;
meta->dbmeta.record_count = 0;
meta->dbmeta.last_pgno = PGNO_BASE_MD + 1;
meta->curregion = 1;
meta->nregions = 1;
if ((ret = __memp_ftruncate(mpf, dbc->txn,
dbc->thread_info, PGNO_BASE_MD + 1, MP_TRUNC_NOCACHE)) != 0)
goto err;
/* Create the first region. */
pgno = PGNO_BASE_MD + 1;
if ((ret = __memp_fget(mpf, &pgno, dbc->thread_info,
dbc->txn, DB_MPOOL_CREATE | DB_MPOOL_DIRTY, &pg)) != 0)
goto err;
memset(pg, 0, dbp->pgsize);
P_INIT(pg,
dbp->pgsize, 1, PGNO_INVALID, PGNO_INVALID, 0, P_IHEAP);
ret = __db_log_page(dbp, dbc->txn, &pg->lsn, pgno, (PAGE *)pg);
if ((t_ret = __memp_fput(
mpf, dbc->thread_info, pg, dbp->priority)) != 0 && ret == 0)
ret = t_ret;
err: if ((t_ret = __memp_fput(mpf,
dbc->thread_info, meta, dbc->priority)) != 0 && ret == 0)
ret = t_ret;
if ((t_ret = __TLPUT(dbc, meta_lock)) && ret == 0)
ret = t_ret;
return (ret);
}
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