/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1990, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Mike Olson.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "namespace.h"
#include <sys/param.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"

#include <db.h>
#include "btree.h"

static int bt_meta(BTREE *);

/*
 * BT_CLOSE -- Close a btree.
 *
 * Parameters:
 *      dbp:    pointer to access method
 *
 * Returns:
 *      RET_ERROR, RET_SUCCESS
 */
int
__bt_close(DB *dbp)
{
        BTREE *t;
        int fd;

        t = dbp->internal;

        /* Toss any page pinned across calls. */
        if (t->bt_pinned != NULL) {
                mpool_put(t->bt_mp, t->bt_pinned, 0);
                t->bt_pinned = NULL;
        }

        /* Sync the tree. */
        if (__bt_sync(dbp, 0) == RET_ERROR)
                return (RET_ERROR);

        /* Close the memory pool. */
        if (mpool_close(t->bt_mp) == RET_ERROR)
                return (RET_ERROR);

        /* Free random memory. */
        if (t->bt_cursor.key.data != NULL) {
                free(t->bt_cursor.key.data);
                t->bt_cursor.key.size = 0;
                t->bt_cursor.key.data = NULL;
        }
        if (t->bt_rkey.data) {
                free(t->bt_rkey.data);
                t->bt_rkey.size = 0;
                t->bt_rkey.data = NULL;
        }
        if (t->bt_rdata.data) {
                free(t->bt_rdata.data);
                t->bt_rdata.size = 0;
                t->bt_rdata.data = NULL;
        }

        fd = t->bt_fd;
        free(t);
        free(dbp);
        return (_close(fd) ? RET_ERROR : RET_SUCCESS);
}

/*
 * BT_SYNC -- sync the btree to disk.
 *
 * Parameters:
 *      dbp:    pointer to access method
 *
 * Returns:
 *      RET_SUCCESS, RET_ERROR.
 */
int
__bt_sync(const DB *dbp, u_int flags)
{
        BTREE *t;
        int status;

        t = dbp->internal;

        /* Toss any page pinned across calls. */
        if (t->bt_pinned != NULL) {
                mpool_put(t->bt_mp, t->bt_pinned, 0);
                t->bt_pinned = NULL;
        }

        /* Sync doesn't currently take any flags. */
        if (flags != 0) {
                errno = EINVAL;
                return (RET_ERROR);
        }

        if (F_ISSET(t, B_INMEM | B_RDONLY) ||
            !F_ISSET(t, B_MODIFIED | B_METADIRTY))
                return (RET_SUCCESS);

        if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
                return (RET_ERROR);

        if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
                F_CLR(t, B_MODIFIED);

        return (status);
}

/*
 * BT_META -- write the tree meta data to disk.
 *
 * Parameters:
 *      t:      tree
 *
 * Returns:
 *      RET_ERROR, RET_SUCCESS
 */
static int
bt_meta(BTREE *t)
{
        BTMETA m;
        void *p;

        if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
                return (RET_ERROR);

        /* Fill in metadata. */
        m.magic = BTREEMAGIC;
        m.version = BTREEVERSION;
        m.psize = t->bt_psize;
        m.free = t->bt_free;
        m.nrecs = t->bt_nrecs;
        m.flags = F_ISSET(t, SAVEMETA);

        memmove(p, &m, sizeof(BTMETA));
        mpool_put(t->bt_mp, p, MPOOL_DIRTY);
        return (RET_SUCCESS);
}