hash_meta.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1999-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: hash_meta.c,v 12.1 2005/06/16 20:22:52 bostic Exp $
 */

#include "db_config.h"

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>
#endif

#include "db_int.h"
#include "dbinc/db_page.h"
#include "dbinc/db_shash.h"
#include "dbinc/hash.h"
#include "dbinc/lock.h"
#include "dbinc/mp.h"

/*
 * Acquire the meta-data page.
 *
 * PUBLIC: int __ham_get_meta __P((DBC *));
 */
int
__ham_get_meta(dbc)
        DBC *dbc;
{
        DB *dbp;
        DB_MPOOLFILE *mpf;
        HASH *hashp;
        HASH_CURSOR *hcp;
        int ret;

        dbp = dbc->dbp;
        mpf = dbp->mpf;
        hashp = dbp->h_internal;
        hcp = (HASH_CURSOR *)dbc->internal;

        if ((ret = __db_lget(dbc, 0,
             hashp->meta_pgno, DB_LOCK_READ, 0, &hcp->hlock)) != 0)
                return (ret);

        if ((ret = __memp_fget(mpf,
            &hashp->meta_pgno, DB_MPOOL_CREATE, &(hcp->hdr))) != 0)
                (void)__LPUT(dbc, hcp->hlock);

        return (ret);
}

/*
 * Release the meta-data page.
 *
 * PUBLIC: int __ham_release_meta __P((DBC *));
 */
int
__ham_release_meta(dbc)
        DBC *dbc;
{
        DB_MPOOLFILE *mpf;
        HASH_CURSOR *hcp;

        mpf = dbc->dbp->mpf;
        hcp = (HASH_CURSOR *)dbc->internal;

        if (hcp->hdr)
                (void)__memp_fput(mpf, hcp->hdr,
                    F_ISSET(hcp, H_DIRTY) ? DB_MPOOL_DIRTY : 0);
        hcp->hdr = NULL;
        F_CLR(hcp, H_DIRTY);

        return (__TLPUT(dbc, hcp->hlock));
}

/*
 * Mark the meta-data page dirty.
 *
 * PUBLIC: int __ham_dirty_meta __P((DBC *));
 */
int
__ham_dirty_meta(dbc)
        DBC *dbc;
{
        DB *dbp;
        HASH *hashp;
        HASH_CURSOR *hcp;
        int ret;

        dbp = dbc->dbp;
        hashp = dbp->h_internal;
        hcp = (HASH_CURSOR *)dbc->internal;

        ret = 0;

        ret = __db_lget(dbc, LCK_COUPLE,
             hashp->meta_pgno, DB_LOCK_WRITE, 0, &hcp->hlock);

        if (ret == 0)
                F_SET(hcp, H_DIRTY);
        return (ret);
}

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