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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1996-2002
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char revid[] = "$Id: hash_reclaim.c,v 11.12 2002/03/28 19:49:43 bostic Exp $";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <string.h>
#endif
#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/hash.h"
/*
* __ham_reclaim --
* Reclaim the pages from a subdatabase and return them to the
* parent free list. For now, we link each freed page on the list
* separately. If people really store hash databases in subdatabases
* and do a lot of creates and deletes, this is going to be a problem,
* because hash needs chunks of contiguous storage. We may eventually
* need to go to a model where we maintain the free list with chunks of
* contiguous pages as well.
*
* PUBLIC: int __ham_reclaim __P((DB *, DB_TXN *txn));
*/
int
__ham_reclaim(dbp, txn)
DB *dbp;
DB_TXN *txn;
{
DBC *dbc;
HASH_CURSOR *hcp;
int ret;
/* Open up a cursor that we'll use for traversing. */
if ((ret = dbp->cursor(dbp, txn, &dbc, 0)) != 0)
return (ret);
hcp = (HASH_CURSOR *)dbc->internal;
if ((ret = __ham_get_meta(dbc)) != 0)
goto err;
if ((ret = __ham_traverse(dbc,
DB_LOCK_WRITE, __db_reclaim_callback, dbc, 1)) != 0)
goto err;
if ((ret = dbc->c_close(dbc)) != 0)
goto err;
if ((ret = __ham_release_meta(dbc)) != 0)
goto err;
return (0);
err: if (hcp->hdr != NULL)
(void)__ham_release_meta(dbc);
(void)dbc->c_close(dbc);
return (ret);
}
/*
* __ham_truncate --
* Reclaim the pages from a subdatabase and return them to the
* parent free list.
*
* PUBLIC: int __ham_truncate __P((DB *, DB_TXN *txn, u_int32_t *));
*/
int
__ham_truncate(dbp, txn, countp)
DB *dbp;
DB_TXN *txn;
u_int32_t *countp;
{
DBC *dbc;
HASH_CURSOR *hcp;
db_trunc_param trunc;
int ret;
/* Open up a cursor that we'll use for traversing. */
if ((ret = dbp->cursor(dbp, txn, &dbc, 0)) != 0)
return (ret);
hcp = (HASH_CURSOR *)dbc->internal;
if ((ret = __ham_get_meta(dbc)) != 0)
goto err;
trunc.count = 0;
trunc.dbc = dbc;
if ((ret = __ham_traverse(dbc,
DB_LOCK_WRITE, __db_truncate_callback, &trunc, 1)) != 0)
goto err;
if ((ret = __ham_release_meta(dbc)) != 0)
goto err;
if ((ret = dbc->c_close(dbc)) != 0)
goto err;
*countp = trunc.count;
return (0);
err: if (hcp->hdr != NULL)
(void)__ham_release_meta(dbc);
(void)dbc->c_close(dbc);
return (ret);
}
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