1N/A/*-
1N/A * See the file LICENSE for redistribution information.
1N/A *
1N/A * Copyright (c) 1996, 1997, 1998
1N/A * Sleepycat Software. All rights reserved.
1N/A */
1N/A/*
1N/A * Copyright (c) 1990, 1993, 1994, 1995, 1996
1N/A * Keith Bostic. All rights reserved.
1N/A */
1N/A/*
1N/A * Copyright (c) 1990, 1993, 1994, 1995
1N/A * The Regents of the University of California. All rights reserved.
1N/A *
1N/A * This code is derived from software contributed to Berkeley by
1N/A * Mike Olson.
1N/A *
1N/A * Redistribution and use in source and binary forms, with or without
1N/A * modification, are permitted provided that the following conditions
1N/A * are met:
1N/A * 1. Redistributions of source code must retain the above copyright
1N/A * notice, this list of conditions and the following disclaimer.
1N/A * 2. Redistributions in binary form must reproduce the above copyright
1N/A * notice, this list of conditions and the following disclaimer in the
1N/A * documentation and/or other materials provided with the distribution.
1N/A * 3. All advertising materials mentioning features or use of this software
1N/A * must display the following acknowledgement:
1N/A * This product includes software developed by the University of
1N/A * California, Berkeley and its contributors.
1N/A * 4. Neither the name of the University nor the names of its contributors
1N/A * may be used to endorse or promote products derived from this software
1N/A * without specific prior written permission.
1N/A *
1N/A * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
1N/A * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
1N/A * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
1N/A * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
1N/A * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
1N/A * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
1N/A * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
1N/A * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
1N/A * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
1N/A * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
1N/A * SUCH DAMAGE.
1N/A */
1N/A
1N/A#include "config.h"
1N/A
1N/A#ifndef lint
1N/Astatic const char sccsid[] = "@(#)bt_page.c 10.17 (Sleepycat) 1/3/99";
1N/A#endif /* not lint */
1N/A
1N/A#ifndef NO_SYSTEM_INCLUDES
1N/A#include <sys/types.h>
1N/A
1N/A#include <errno.h>
1N/A#include <string.h>
1N/A#endif
1N/A
1N/A#include "db_int.h"
1N/A#include "db_page.h"
1N/A#include "btree.h"
1N/A
1N/A/*
1N/A * __bam_new --
1N/A * Get a new page, preferably from the freelist.
1N/A *
1N/A * PUBLIC: int __bam_new __P((DBC *, u_int32_t, PAGE **));
1N/A */
1N/Aint
1N/A__bam_new(dbc, type, pagepp)
1N/A DBC *dbc;
1N/A u_int32_t type;
1N/A PAGE **pagepp;
1N/A{
1N/A BTMETA *meta;
1N/A DB *dbp;
1N/A DB_LOCK metalock;
1N/A PAGE *h;
1N/A db_pgno_t pgno;
1N/A int ret;
1N/A
1N/A dbp = dbc->dbp;
1N/A meta = NULL;
1N/A h = NULL;
1N/A metalock = LOCK_INVALID;
1N/A
1N/A pgno = PGNO_METADATA;
1N/A if ((ret = __bam_lget(dbc, 0, pgno, DB_LOCK_WRITE, &metalock)) != 0)
1N/A goto err;
1N/A if ((ret = memp_fget(dbp->mpf, &pgno, 0, (PAGE **)&meta)) != 0)
1N/A goto err;
1N/A
1N/A if (meta->free == PGNO_INVALID) {
1N/A if ((ret = memp_fget(dbp->mpf, &pgno, DB_MPOOL_NEW, &h)) != 0)
1N/A goto err;
1N/A ZERO_LSN(h->lsn);
1N/A h->pgno = pgno;
1N/A } else {
1N/A pgno = meta->free;
1N/A if ((ret = memp_fget(dbp->mpf, &pgno, 0, &h)) != 0)
1N/A goto err;
1N/A meta->free = h->next_pgno;
1N/A }
1N/A
1N/A /* Log the change. */
1N/A if (DB_LOGGING(dbc)) {
1N/A if ((ret = __bam_pg_alloc_log(dbp->dbenv->lg_info, dbc->txn,
1N/A &meta->lsn, 0, dbp->log_fileid, &meta->lsn, &h->lsn,
1N/A h->pgno, (u_int32_t)type, meta->free)) != 0)
1N/A goto err;
1N/A LSN(h) = LSN(meta);
1N/A }
1N/A
1N/A (void)memp_fput(dbp->mpf, (PAGE *)meta, DB_MPOOL_DIRTY);
1N/A (void)__BT_TLPUT(dbc, metalock);
1N/A
1N/A P_INIT(h, dbp->pgsize, h->pgno, PGNO_INVALID, PGNO_INVALID, 0, type);
1N/A *pagepp = h;
1N/A return (0);
1N/A
1N/Aerr: if (h != NULL)
1N/A (void)memp_fput(dbp->mpf, h, 0);
1N/A if (meta != NULL)
1N/A (void)memp_fput(dbp->mpf, meta, 0);
1N/A if (metalock != LOCK_INVALID)
1N/A (void)__BT_TLPUT(dbc, metalock);
1N/A return (ret);
1N/A}
1N/A
1N/A/*
1N/A * __bam_lput --
1N/A * The standard lock put call.
1N/A *
1N/A * PUBLIC: int __bam_lput __P((DBC *, DB_LOCK));
1N/A */
1N/Aint
1N/A__bam_lput(dbc, lock)
1N/A DBC *dbc;
1N/A DB_LOCK lock;
1N/A{
1N/A return (__BT_LPUT(dbc, lock));
1N/A}
1N/A
1N/A/*
1N/A * __bam_free --
1N/A * Add a page to the head of the freelist.
1N/A *
1N/A * PUBLIC: int __bam_free __P((DBC *, PAGE *));
1N/A */
1N/Aint
1N/A__bam_free(dbc, h)
1N/A DBC *dbc;
1N/A PAGE *h;
1N/A{
1N/A BTMETA *meta;
1N/A DB *dbp;
1N/A DBT ldbt;
1N/A DB_LOCK metalock;
1N/A db_pgno_t pgno;
1N/A u_int32_t dirty_flag;
1N/A int ret, t_ret;
1N/A
1N/A dbp = dbc->dbp;
1N/A
1N/A /*
1N/A * Retrieve the metadata page and insert the page at the head of
1N/A * the free list. If either the lock get or page get routines
1N/A * fail, then we need to put the page with which we were called
1N/A * back because our caller assumes we take care of it.
1N/A */
1N/A dirty_flag = 0;
1N/A pgno = PGNO_METADATA;
1N/A if ((ret = __bam_lget(dbc, 0, pgno, DB_LOCK_WRITE, &metalock)) != 0)
1N/A goto err;
1N/A if ((ret = memp_fget(dbp->mpf, &pgno, 0, (PAGE **)&meta)) != 0) {
1N/A (void)__BT_TLPUT(dbc, metalock);
1N/A goto err;
1N/A }
1N/A
1N/A /* Log the change. */
1N/A if (DB_LOGGING(dbc)) {
1N/A memset(&ldbt, 0, sizeof(ldbt));
1N/A ldbt.data = h;
1N/A ldbt.size = P_OVERHEAD;
1N/A if ((ret = __bam_pg_free_log(dbp->dbenv->lg_info,
1N/A dbc->txn, &meta->lsn, 0, dbp->log_fileid, h->pgno,
1N/A &meta->lsn, &ldbt, meta->free)) != 0) {
1N/A (void)memp_fput(dbp->mpf, (PAGE *)meta, 0);
1N/A (void)__BT_TLPUT(dbc, metalock);
1N/A return (ret);
1N/A }
1N/A LSN(h) = LSN(meta);
1N/A }
1N/A
1N/A /*
1N/A * The page should have nothing interesting on it, re-initialize it,
1N/A * leaving only the page number and the LSN.
1N/A */
1N/A#ifdef DIAGNOSTIC
1N/A { db_pgno_t __pgno; DB_LSN __lsn;
1N/A __pgno = h->pgno;
1N/A __lsn = h->lsn;
1N/A memset(h, 0xdb, dbp->pgsize);
1N/A h->pgno = __pgno;
1N/A h->lsn = __lsn;
1N/A }
1N/A#endif
1N/A P_INIT(h, dbp->pgsize, h->pgno, PGNO_INVALID, meta->free, 0, P_INVALID);
1N/A
1N/A /* Link the page on the metadata free list. */
1N/A meta->free = h->pgno;
1N/A
1N/A /* Discard the metadata page. */
1N/A ret = memp_fput(dbp->mpf, (PAGE *)meta, DB_MPOOL_DIRTY);
1N/A if ((t_ret = __BT_TLPUT(dbc, metalock)) != 0)
1N/A ret = t_ret;
1N/A
1N/A /* Discard the caller's page reference. */
1N/A dirty_flag = DB_MPOOL_DIRTY;
1N/Aerr: if ((t_ret = memp_fput(dbp->mpf, h, dirty_flag)) != 0 && ret == 0)
1N/A ret = t_ret;
1N/A
1N/A /*
1N/A * XXX
1N/A * We have to unlock the caller's page in the caller!
1N/A */
1N/A return (ret);
1N/A}
1N/A
1N/A#ifdef DEBUG
1N/A/*
1N/A * __bam_lt --
1N/A * Print out the list of locks currently held by a cursor.
1N/A *
1N/A * PUBLIC: int __bam_lt __P((DBC *));
1N/A */
1N/Aint
1N/A__bam_lt(dbc)
1N/A DBC *dbc;
1N/A{
1N/A DB *dbp;
1N/A DB_LOCKREQ req;
1N/A
1N/A dbp = dbc->dbp;
1N/A if (F_ISSET(dbp, DB_AM_LOCKING)) {
1N/A req.op = DB_LOCK_DUMP;
1N/A lock_vec(dbp->dbenv->lk_info, dbc->locker, 0, &req, 1, NULL);
1N/A }
1N/A return (0);
1N/A}
1N/A#endif
1N/A
1N/A/*
1N/A * __bam_lget --
1N/A * The standard lock get call.
1N/A *
1N/A * PUBLIC: int __bam_lget
1N/A * PUBLIC: __P((DBC *, int, db_pgno_t, db_lockmode_t, DB_LOCK *));
1N/A */
1N/Aint
1N/A__bam_lget(dbc, do_couple, pgno, mode, lockp)
1N/A DBC *dbc;
1N/A int do_couple;
1N/A db_pgno_t pgno;
1N/A db_lockmode_t mode;
1N/A DB_LOCK *lockp;
1N/A{
1N/A DB *dbp;
1N/A DB_LOCKREQ couple[2];
1N/A int ret;
1N/A
1N/A dbp = dbc->dbp;
1N/A
1N/A if (!F_ISSET(dbp, DB_AM_LOCKING)) {
1N/A *lockp = LOCK_INVALID;
1N/A return (0);
1N/A }
1N/A
1N/A dbc->lock.pgno = pgno;
1N/A
1N/A /*
1N/A * If the object not currently locked, acquire the lock and return,
1N/A * otherwise, lock couple. If we fail and it's not a system error,
1N/A * convert to EAGAIN.
1N/A */
1N/A if (do_couple) {
1N/A couple[0].op = DB_LOCK_GET;
1N/A couple[0].obj = &dbc->lock_dbt;
1N/A couple[0].mode = mode;
1N/A couple[1].op = DB_LOCK_PUT;
1N/A couple[1].lock = *lockp;
1N/A
1N/A if (dbc->txn == NULL)
1N/A ret = lock_vec(dbp->dbenv->lk_info,
1N/A dbc->locker, 0, couple, 2, NULL);
1N/A else
1N/A ret = lock_tvec(dbp->dbenv->lk_info,
1N/A dbc->txn, 0, couple, 2, NULL);
1N/A if (ret != 0) {
1N/A /* If we fail, discard the lock we held. */
1N/A __BT_LPUT(dbc, *lockp);
1N/A
1N/A return (ret < 0 ? EAGAIN : ret);
1N/A }
1N/A *lockp = couple[0].lock;
1N/A } else {
1N/A if (dbc->txn == NULL)
1N/A ret = lock_get(dbp->dbenv->lk_info,
1N/A dbc->locker, 0, &dbc->lock_dbt, mode, lockp);
1N/A else
1N/A ret = lock_tget(dbp->dbenv->lk_info,
1N/A dbc->txn, 0, &dbc->lock_dbt, mode, lockp);
1N/A return (ret < 0 ? EAGAIN : ret);
1N/A }
1N/A return (0);
1N/A}