158f0484fSRodney W. Grimes /*-
28a16b7a1SPedro F. Giffuni * SPDX-License-Identifier: BSD-3-Clause
38a16b7a1SPedro F. Giffuni *
4ef5d438eSPaul Traina * Copyright (c) 1990, 1993, 1994
558f0484fSRodney W. Grimes * The Regents of the University of California. All rights reserved.
658f0484fSRodney W. Grimes *
758f0484fSRodney W. Grimes * Redistribution and use in source and binary forms, with or without
858f0484fSRodney W. Grimes * modification, are permitted provided that the following conditions
958f0484fSRodney W. Grimes * are met:
1058f0484fSRodney W. Grimes * 1. Redistributions of source code must retain the above copyright
1158f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer.
1258f0484fSRodney W. Grimes * 2. Redistributions in binary form must reproduce the above copyright
1358f0484fSRodney W. Grimes * notice, this list of conditions and the following disclaimer in the
1458f0484fSRodney W. Grimes * documentation and/or other materials provided with the distribution.
15fbbd9655SWarner Losh * 3. Neither the name of the University nor the names of its contributors
1658f0484fSRodney W. Grimes * may be used to endorse or promote products derived from this software
1758f0484fSRodney W. Grimes * without specific prior written permission.
1858f0484fSRodney W. Grimes *
1958f0484fSRodney W. Grimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2058f0484fSRodney W. Grimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2158f0484fSRodney W. Grimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2258f0484fSRodney W. Grimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2358f0484fSRodney W. Grimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2458f0484fSRodney W. Grimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2558f0484fSRodney W. Grimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2658f0484fSRodney W. Grimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2758f0484fSRodney W. Grimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2858f0484fSRodney W. Grimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2958f0484fSRodney W. Grimes * SUCH DAMAGE.
3058f0484fSRodney W. Grimes */
3158f0484fSRodney W. Grimes
3258f0484fSRodney W. Grimes #include <sys/types.h>
3358f0484fSRodney W. Grimes
3458f0484fSRodney W. Grimes #include <stdio.h>
3558f0484fSRodney W. Grimes
3658f0484fSRodney W. Grimes #include <db.h>
3758f0484fSRodney W. Grimes #include "btree.h"
3858f0484fSRodney W. Grimes
3958f0484fSRodney W. Grimes /*
40ef5d438eSPaul Traina * __bt_free --
41ef5d438eSPaul Traina * Put a page on the freelist.
4258f0484fSRodney W. Grimes *
4358f0484fSRodney W. Grimes * Parameters:
4458f0484fSRodney W. Grimes * t: tree
4558f0484fSRodney W. Grimes * h: page to free
4658f0484fSRodney W. Grimes *
4758f0484fSRodney W. Grimes * Returns:
4858f0484fSRodney W. Grimes * RET_ERROR, RET_SUCCESS
49ef5d438eSPaul Traina *
50ef5d438eSPaul Traina * Side-effect:
51ef5d438eSPaul Traina * mpool_put's the page.
5258f0484fSRodney W. Grimes */
5358f0484fSRodney W. Grimes int
__bt_free(BTREE * t,PAGE * h)540ac22237SXin LI __bt_free(BTREE *t, PAGE *h)
5558f0484fSRodney W. Grimes {
56ef5d438eSPaul Traina /* Insert the page at the head of the free list. */
5758f0484fSRodney W. Grimes h->prevpg = P_INVALID;
5858f0484fSRodney W. Grimes h->nextpg = t->bt_free;
5958f0484fSRodney W. Grimes t->bt_free = h->pgno;
607d0cc08eSGuido van Rooij F_SET(t, B_METADIRTY);
6158f0484fSRodney W. Grimes
6258f0484fSRodney W. Grimes /* Make sure the page gets written back. */
6358f0484fSRodney W. Grimes return (mpool_put(t->bt_mp, h, MPOOL_DIRTY));
6458f0484fSRodney W. Grimes }
6558f0484fSRodney W. Grimes
6658f0484fSRodney W. Grimes /*
67ef5d438eSPaul Traina * __bt_new --
68ef5d438eSPaul Traina * Get a new page, preferably from the freelist.
6958f0484fSRodney W. Grimes *
7058f0484fSRodney W. Grimes * Parameters:
7158f0484fSRodney W. Grimes * t: tree
7258f0484fSRodney W. Grimes * npg: storage for page number.
7358f0484fSRodney W. Grimes *
7458f0484fSRodney W. Grimes * Returns:
7558f0484fSRodney W. Grimes * Pointer to a page, NULL on error.
7658f0484fSRodney W. Grimes */
7758f0484fSRodney W. Grimes PAGE *
__bt_new(BTREE * t,pgno_t * npg)780ac22237SXin LI __bt_new(BTREE *t, pgno_t *npg)
7958f0484fSRodney W. Grimes {
8058f0484fSRodney W. Grimes PAGE *h;
8158f0484fSRodney W. Grimes
8258f0484fSRodney W. Grimes if (t->bt_free != P_INVALID &&
8358f0484fSRodney W. Grimes (h = mpool_get(t->bt_mp, t->bt_free, 0)) != NULL) {
8458f0484fSRodney W. Grimes *npg = t->bt_free;
8558f0484fSRodney W. Grimes t->bt_free = h->nextpg;
867d0cc08eSGuido van Rooij F_SET(t, B_METADIRTY);
8758f0484fSRodney W. Grimes return (h);
8858f0484fSRodney W. Grimes }
899fc74a87SXin LI return (mpool_new(t->bt_mp, npg, MPOOL_PAGE_NEXT));
9058f0484fSRodney W. Grimes }
91