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/*-
* See the file LICENSE for redistribution information.
*
* Copyright (c) 1999
* Sleepycat Software. All rights reserved.
*/
#include "db_config.h"
#ifndef lint
static const char sccsid[] = "@(#)hash_meta.c 11.3 (Sleepycat) 9/14/99";
#endif /* not lint */
#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#include <errno.h>
#endif
#include "db_int.h"
#include "db_page.h"
#include "hash.h"
#include "db_shash.h"
#include "lock.h"
#include "txn.h"
/*
* Acquire the meta-data page.
*
* PUBLIC: int CDB___ham_get_meta __P((DBC *));
*/
int
CDB___ham_get_meta(dbc)
DBC *dbc;
{
HASH_CURSOR *hcp;
HASH *hashp;
DB *dbp;
int ret;
hcp = dbc->internal;
dbp = dbc->dbp;
hashp = dbp->h_internal;
if (dbp->dbenv != NULL && F_ISSET(dbp->dbenv, DB_ENV_LOCKING) &&
!F_ISSET(dbc, DBC_RECOVER)) {
dbc->lock.pgno = hashp->meta_pgno;
if ((ret = CDB_lock_get(dbp->dbenv, dbc->locker,
DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
&dbc->lock_dbt, DB_LOCK_READ, &hcp->hlock)) != 0)
return (ret);
}
if ((ret = CDB___ham_get_page(dbc->dbp,
hashp->meta_pgno, (PAGE **)&(hcp->hdr))) != 0 &&
hcp->hlock.off != LOCK_INVALID) {
(void)CDB_lock_put(dbc->dbp->dbenv, &hcp->hlock);
hcp->hlock.off = LOCK_INVALID;
}
return (ret);
}
/*
* Release the meta-data page.
*
* PUBLIC: int CDB___ham_release_meta __P((DBC *));
*/
int
CDB___ham_release_meta(dbc)
DBC *dbc;
{
HASH_CURSOR *hcp;
hcp = dbc->internal;
if (hcp->hdr)
(void)CDB___ham_put_page(dbc->dbp, (PAGE *)hcp->hdr,
F_ISSET(hcp, H_DIRTY) ? 1 : 0);
hcp->hdr = NULL;
if (!F_ISSET(dbc, DBC_RECOVER) &&
dbc->txn == NULL && hcp->hlock.off != LOCK_INVALID)
(void)CDB_lock_put(dbc->dbp->dbenv, &hcp->hlock);
hcp->hlock.off = LOCK_INVALID;
F_CLR(hcp, H_DIRTY);
return (0);
}
/*
* Mark the meta-data page dirty.
*
* PUBLIC: int CDB___ham_dirty_meta __P((DBC *));
*/
int
CDB___ham_dirty_meta(dbc)
DBC *dbc;
{
DB *dbp;
DB_LOCK _tmp;
HASH *hashp;
HASH_CURSOR *hcp;
int ret;
dbp = dbc->dbp;
hashp = dbp->h_internal;
hcp = dbc->internal;
ret = 0;
if (F_ISSET(dbp->dbenv, DB_ENV_LOCKING) && !F_ISSET(dbc, DBC_RECOVER)) {
dbc->lock.pgno = hashp->meta_pgno;
if ((ret = CDB_lock_get(dbp->dbenv, dbc->locker,
DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
&dbc->lock_dbt, DB_LOCK_WRITE, &_tmp)) == 0) {
ret = CDB_lock_put(dbp->dbenv, &hcp->hlock);
hcp->hlock = _tmp;
}
}
if (ret == 0)
F_SET(hcp, H_DIRTY);
return (ret);
}
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