db/mp/mp_fset.c

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *  Sleepycat Software.  All rights reserved.
 */
#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)mp_fset.c 10.16 (Sleepycat) 9/27/98";
#endif /* not lint */

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

#include <errno.h>
#endif

#include "db_int.h"
#include "shqueue.h"
#include "db_shash.h"
#include "mp.h"
#include "common_ext.h"

/*
 * memp_fset --
 *  Mpool page set-flag routine.
 */
int
memp_fset(dbmfp, pgaddr, flags)
    DB_MPOOLFILE *dbmfp;
    void *pgaddr;
    u_int32_t flags;
{
    BH *bhp;
    DB_MPOOL *dbmp;
    MPOOL *mp;
    int ret;

    dbmp = dbmfp->dbmp;
    mp = dbmp->mp;

    MP_PANIC_CHECK(dbmp);

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

    if ((ret = __db_fchk(dbmp->dbenv, "memp_fset", flags,
        DB_MPOOL_DIRTY | DB_MPOOL_CLEAN | DB_MPOOL_DISCARD)) != 0)
        return (ret);
    if ((ret = __db_fcchk(dbmp->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(dbmp->dbenv,
            "%s: dirty flag set for readonly file page",
            __memp_fn(dbmfp));
        return (EACCES);
    }

    /* Convert the page address to a buffer header. */
    bhp = (BH *)((u_int8_t *)pgaddr - SSZA(BH, buf));

    LOCKREGION(dbmp);

    if (LF_ISSET(DB_MPOOL_CLEAN) && F_ISSET(bhp, BH_DIRTY)) {
        ++mp->stat.st_page_clean;
        --mp->stat.st_page_dirty;
        F_CLR(bhp, BH_DIRTY);
    }
    if (LF_ISSET(DB_MPOOL_DIRTY) && !F_ISSET(bhp, BH_DIRTY)) {
        --mp->stat.st_page_clean;
        ++mp->stat.st_page_dirty;
        F_SET(bhp, BH_DIRTY);
    }
    if (LF_ISSET(DB_MPOOL_DISCARD))
        F_SET(bhp, BH_DISCARD);

    UNLOCKREGION(dbmp);
    return (0);
}