mp_fset.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2005
 *      Sleepycat Software.  All rights reserved.
 *
 * $Id: mp_fset.c,v 12.5 2005/10/07 20:21:33 ubell Exp $
 */

#include "db_config.h"

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

#endif

#include "db_int.h"
#include "dbinc/db_shash.h"
#include "dbinc/log.h"
#include "dbinc/mp.h"

/*
 * __memp_fset_pp --
 *      DB_MPOOLFILE->set pre/post processing.
 *
 * PUBLIC: int __memp_fset_pp __P((DB_MPOOLFILE *, void *, u_int32_t));
 */
int
__memp_fset_pp(dbmfp, pgaddr, flags)
        DB_MPOOLFILE *dbmfp;
        void *pgaddr;
        u_int32_t flags;
{
        DB_ENV *dbenv;
        DB_THREAD_INFO *ip;
        int ret;

        dbenv = dbmfp->dbenv;

        PANIC_CHECK(dbenv);
        MPF_ILLEGAL_BEFORE_OPEN(dbmfp, "DB_MPOOLFILE->set");

        /* Validate arguments. */
        if (flags == 0)
                return (__db_ferr(dbenv, "memp_fset", 1));

        if ((ret = __db_fchk(dbenv, "memp_fset", flags,
            DB_MPOOL_CLEAN | DB_MPOOL_DIRTY | DB_MPOOL_DISCARD)) != 0)
                return (ret);
        if ((ret = __db_fcchk(dbenv, "memp_fset",
            flags, DB_MPOOL_CLEAN, DB_MPOOL_DIRTY)) != 0)
                return (ret);

        if (LF_ISSET(DB_MPOOL_DIRTY) && F_ISSET(dbmfp, MP_READONLY)) {
                __db_err(dbenv, "%s: dirty flag set for readonly file page",
                    __memp_fn(dbmfp));
                return (EACCES);
        }

        ENV_ENTER(dbenv, ip);
        REPLICATION_WRAP(dbenv, (__memp_fset(dbmfp, pgaddr, flags)), ret);
        ENV_LEAVE(dbenv, ip);
        return (ret);
}

/*
 * __memp_fset --
 *      DB_MPOOLFILE->set.
 *
 * PUBLIC: int __memp_fset __P((DB_MPOOLFILE *, void *, u_int32_t));
 */
int
__memp_fset(dbmfp, pgaddr, flags)
        DB_MPOOLFILE *dbmfp;
        void *pgaddr;
        u_int32_t flags;
{
        BH *bhp;
        DB_ENV *dbenv;
        DB_MPOOL *dbmp;
        DB_MPOOL_HASH *hp;
        MPOOL *c_mp;
        u_int32_t n_cache;

        dbenv = dbmfp->dbenv;
        dbmp = dbenv->mp_handle;

        /* Convert the page address to a buffer header and hash bucket. */
        bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));
        n_cache = NCACHE(dbmp->reginfo[0].primary, bhp->mf_offset, bhp->pgno);
        c_mp = dbmp->reginfo[n_cache].primary;
        hp = R_ADDR(&dbmp->reginfo[n_cache], c_mp->htab);
        hp = &hp[NBUCKET(c_mp, bhp->mf_offset, bhp->pgno)];

        MUTEX_LOCK(dbenv, hp->mtx_hash);

        /* Set/clear the page bits. */
        if (LF_ISSET(DB_MPOOL_CLEAN) &&
            F_ISSET(bhp, BH_DIRTY) && !F_ISSET(bhp, BH_DIRTY_CREATE)) {
                DB_ASSERT(hp->hash_page_dirty != 0);
                --hp->hash_page_dirty;
                F_CLR(bhp, BH_DIRTY);
        }
        if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
                ++hp->hash_page_dirty;
                F_SET(bhp, BH_DIRTY);
        }
        if (LF_ISSET(DB_MPOOL_DISCARD))
                F_SET(bhp, BH_DISCARD);

        MUTEX_UNLOCK(dbenv, hp->mtx_hash);
        return (0);
}

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