hash_meta.c

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/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999, 2000
 *      Sleepycat Software.  All rights reserved.
 */

#include "config.h"

#ifndef lint
static const char revid[] = "$Id: hash__meta_8c-source.html,v 1.1 2008/06/08 10:19:32 sebdiaz Exp $";
#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 = (HASH_CURSOR *)dbc->internal;
        dbp = dbc->dbp;
        hashp = dbp->h_internal;

        if (dbp->dbenv != NULL &&
            STD_LOCKING(dbc) && !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 = (HASH_CURSOR *)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 = (HASH_CURSOR *)dbc->internal;

        ret = 0;
        if (STD_LOCKING(dbc) && !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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