bt_open.c

这是linux下运行的mysql软件包,可用于linux 下安装 php + mysql + apach 的网络配置

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996-2002
 *	Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1990, 1993, 1994, 1995, 1996
 *	Keith Bostic.  All rights reserved.
 */
/*
 * Copyright (c) 1990, 1993, 1994, 1995
 *	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 "db_config.h"

#ifndef lint
static const char revid[] = "$Id: bt_open.c,v 11.76 2002/09/04 19:06:42 margo Exp $";
#endif /* not lint */

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

#include <limits.h>
#include <string.h>
#endif

#include "db_int.h"
#include "dbinc/crypto.h"
#include "dbinc/db_page.h"
#include "dbinc/db_swap.h"
#include "dbinc/btree.h"
#include "dbinc/db_shash.h"
#include "dbinc/lock.h"
#include "dbinc/log.h"
#include "dbinc/fop.h"

static void __bam_init_meta __P((DB *, BTMETA *, db_pgno_t, DB_LSN *));

/*
 * __bam_open --
 *	Open a btree.
 *
 * PUBLIC: int __bam_open __P((DB *,
 * PUBLIC:      DB_TXN *, const char *, db_pgno_t, u_int32_t));
 */
int
__bam_open(dbp, txn, name, base_pgno, flags)
	DB *dbp;
	DB_TXN *txn;
	const char *name;
	db_pgno_t base_pgno;
	u_int32_t flags;
{
	BTREE *t;

	COMPQUIET(name, NULL);
	t = dbp->bt_internal;

	/* Initialize the remaining fields/methods of the DB. */
	dbp->key_range = __bam_key_range;
	dbp->stat = __bam_stat;

	/*
	 * We don't permit the user to specify a prefix routine if they didn't
	 * also specify a comparison routine, they can't know enough about our
	 * comparison routine to get it right.
	 */
	if (t->bt_compare == __bam_defcmp && t->bt_prefix != __bam_defpfx) {
		__db_err(dbp->dbenv,
"prefix comparison may not be specified for default comparison routine");
		return (EINVAL);
	}

	/*
	 * Verify that the bt_minkey value specified won't cause the
	 * calculation of ovflsize to underflow [#2406] for this pagesize.
	 */
	if (B_MINKEY_TO_OVFLSIZE(dbp, t->bt_minkey, dbp->pgsize) >
	    B_MINKEY_TO_OVFLSIZE(dbp, DEFMINKEYPAGE, dbp->pgsize)) {
		__db_err(dbp->dbenv,
		    "bt_minkey value of %lu too high for page size of %lu",
		    (u_long)t->bt_minkey, (u_long)dbp->pgsize);
		return (EINVAL);
	}

	/* Start up the tree. */
	return (__bam_read_root(dbp, txn, base_pgno, flags));
}

/*
 * __bam_metachk --
 *
 * PUBLIC: int __bam_metachk __P((DB *, const char *, BTMETA *));
 */
int
__bam_metachk(dbp, name, btm)
	DB *dbp;
	const char *name;
	BTMETA *btm;
{
	DB_ENV *dbenv;
	u_int32_t vers;
	int ret;

	dbenv = dbp->dbenv;

	/*
	 * At this point, all we know is that the magic number is for a Btree.
	 * Check the version, the database may be out of date.
	 */
	vers = btm->dbmeta.version;
	if (F_ISSET(dbp, DB_AM_SWAP))
		M_32_SWAP(vers);
	switch (vers) {
	case 6:
	case 7:
		__db_err(dbenv,
		    "%s: btree version %lu requires a version upgrade",
		    name, (u_long)vers);
		return (DB_OLD_VERSION);
	case 8:
	case 9:
		break;
	default:
		__db_err(dbenv,
		    "%s: unsupported btree version: %lu", name, (u_long)vers);
		return (EINVAL);
	}

	/* Swap the page if we need to. */
	if (F_ISSET(dbp, DB_AM_SWAP) && (ret = __bam_mswap((PAGE *)btm)) != 0)
		return (ret);

	/*
	 * Check application info against metadata info, and set info, flags,
	 * and type based on metadata info.
	 */
	if ((ret =
	    __db_fchk(dbenv, "DB->open", btm->dbmeta.flags, BTM_MASK)) != 0)
		return (ret);

	if (F_ISSET(&btm->dbmeta, BTM_RECNO)) {
		if (dbp->type == DB_BTREE)
			goto wrong_type;
		dbp->type = DB_RECNO;
		DB_ILLEGAL_METHOD(dbp, DB_OK_RECNO);
	} else {
		if (dbp->type == DB_RECNO)
			goto wrong_type;
		dbp->type = DB_BTREE;
		DB_ILLEGAL_METHOD(dbp, DB_OK_BTREE);
	}

	if (F_ISSET(&btm->dbmeta, BTM_DUP))
		F_SET(dbp, DB_AM_DUP);
	else
		if (F_ISSET(dbp, DB_AM_DUP)) {
			__db_err(dbenv,
		"%s: DB_DUP specified to open method but not set in database",
			    name);
			return (EINVAL);
		}

	if (F_ISSET(&btm->dbmeta, BTM_RECNUM)) {
		if (dbp->type != DB_BTREE)
			goto wrong_type;
		F_SET(dbp, DB_AM_RECNUM);

		if ((ret = __db_fcchk(dbenv,
		    "DB->open", dbp->flags, DB_AM_DUP, DB_AM_RECNUM)) != 0)
			return (ret);
	} else
		if (F_ISSET(dbp, DB_AM_RECNUM)) {
			__db_err(dbenv,
	    "%s: DB_RECNUM specified to open method but not set in database",
			    name);
			return (EINVAL);
		}

	if (F_ISSET(&btm->dbmeta, BTM_FIXEDLEN)) {
		if (dbp->type != DB_RECNO)
			goto wrong_type;
		F_SET(dbp, DB_AM_FIXEDLEN);
	} else
		if (F_ISSET(dbp, DB_AM_FIXEDLEN)) {
			__db_err(dbenv,
	"%s: DB_FIXEDLEN specified to open method but not set in database",
			    name);
			return (EINVAL);
		}

	if (F_ISSET(&btm->dbmeta, BTM_RENUMBER)) {
		if (dbp->type != DB_RECNO)
			goto wrong_type;
		F_SET(dbp, DB_AM_RENUMBER);
	} else
		if (F_ISSET(dbp, DB_AM_RENUMBER)) {
			__db_err(dbenv,
	    "%s: DB_RENUMBER specified to open method but not set in database",
			    name);
			return (EINVAL);
		}

	if (F_ISSET(&btm->dbmeta, BTM_SUBDB))
		F_SET(dbp, DB_AM_SUBDB);
	else
		if (F_ISSET(dbp, DB_AM_SUBDB)) {
			__db_err(dbenv,
	    "%s: multiple databases specified but not supported by file",
			    name);
			return (EINVAL);
		}

	if (F_ISSET(&btm->dbmeta, BTM_DUPSORT)) {
		if (dbp->dup_compare == NULL)
			dbp->dup_compare = __bam_defcmp;
		F_SET(dbp, DB_AM_DUPSORT);
	} else
		if (dbp->dup_compare != NULL) {
			__db_err(dbenv,
		"%s: duplicate sort specified but not supported in database",
			    name);
			return (EINVAL);
		}

	/* Set the page size. */
	dbp->pgsize = btm->dbmeta.pagesize;

	/* Copy the file's ID. */
	memcpy(dbp->fileid, btm->dbmeta.uid, DB_FILE_ID_LEN);

	return (0);

wrong_type:
	if (dbp->type == DB_BTREE)
		__db_err(dbenv,
		    "open method type is Btree, database type is Recno");
	else
		__db_err(dbenv,
		    "open method type is Recno, database type is Btree");
	return (EINVAL);
}

/*
 * __bam_read_root --
 *	Read the root page and check a tree.
 *
 * PUBLIC: int __bam_read_root __P((DB *, DB_TXN *, db_pgno_t, u_int32_t));
 */
int
__bam_read_root(dbp, txn, base_pgno, flags)
	DB *dbp;
	DB_TXN *txn;
	db_pgno_t base_pgno;
	u_int32_t flags;
{
	BTMETA *meta;
	BTREE *t;
	DBC *dbc;
	DB_LOCK metalock;
	DB_MPOOLFILE *mpf;
	int ret, t_ret;

	meta = NULL;
	t = dbp->bt_internal;
	LOCK_INIT(metalock);
	mpf = dbp->mpf;
	ret = 0;

	/* Get a cursor.  */
	if ((ret = dbp->cursor(dbp, txn, &dbc, 0)) != 0)
		return (ret);

	/* Get the metadata page. */