db_rec.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

	if (cmp_p == 0 && DB_REDO(op)) {
		/* Redo the relink. */
		pagep->next_pgno = argp->next;

		modified = 1;
	} else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
		/* Undo the relink. */
		pagep->next_pgno = argp->pgno;

		modified = 1;
	}
	if (modified == 1) {
		if (DB_UNDO(op))
			pagep->lsn = argp->lsn_prev;
		else
			pagep->lsn = *lsnp;
	}
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	pagep = NULL;

done:	*lsnp = argp->prev_lsn;
	ret = 0;

out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
}

/*
 * __db_debug_recover --
 *	Recovery function for debug.
 *
 * PUBLIC: int __db_debug_recover __P((DB_ENV *,
 * PUBLIC:     DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_debug_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_debug_args *argp;
	int ret;

	COMPQUIET(dbenv, NULL);
	COMPQUIET(op, DB_TXN_ABORT);
	COMPQUIET(info, NULL);

	REC_PRINT(__db_debug_print);
	REC_NOOP_INTRO(__db_debug_read);

	*lsnp = argp->prev_lsn;
	ret = 0;

	REC_NOOP_CLOSE;
}

/*
 * __db_noop_recover --
 *	Recovery function for noop.
 *
 * PUBLIC: int __db_noop_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_noop_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_noop_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	u_int32_t change;
	int cmp_n, cmp_p, ret;

	pagep = NULL;
	COMPQUIET(info, NULL);
	REC_PRINT(__db_noop_print);
	REC_INTRO(__db_noop_read, 0);

	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0)
		goto out;

	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->prevlsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->prevlsn);
	change = 0;
	if (cmp_p == 0 && DB_REDO(op)) {
		LSN(pagep) = *lsnp;
		change = DB_MPOOL_DIRTY;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		LSN(pagep) = argp->prevlsn;
		change = DB_MPOOL_DIRTY;
	}
	ret = mpf->put(mpf, pagep, change);
	pagep = NULL;

done:	*lsnp = argp->prev_lsn;
out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	REC_CLOSE;
}

/*
 * __db_pg_alloc_recover --
 *	Recovery function for pg_alloc.
 *
 * PUBLIC: int __db_pg_alloc_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_alloc_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_pg_alloc_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DBMETA *meta;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, created, level, modified, ret;

	meta = NULL;
	pagep = NULL;
	REC_PRINT(__db_pg_alloc_print);
	REC_INTRO(__db_pg_alloc_read, 0);

	/*
	 * Fix up the allocated page.  If we're redoing the operation, we have
	 * to get the page (creating it if it doesn't exist), and update its
	 * LSN.  If we're undoing the operation, we have to reset the page's
	 * LSN and put it on the free list.
	 *
	 * Fix up the metadata page.  If we're redoing the operation, we have
	 * to get the metadata page and update its LSN and its free pointer.
	 * If we're undoing the operation and the page was ever created, we put
	 * it on the freelist.
	 */
	pgno = PGNO_BASE_MD;
	if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
		/* The metadata page must always exist on redo. */
		if (DB_REDO(op)) {
			__db_pgerr(file_dbp, pgno, ret);
			goto out;
		} else
			goto done;
	}
	created = modified = 0;
	if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
		/*
		 * We have to be able to identify if a page was newly
		 * created so we can recover it properly.  We cannot simply
		 * look for an empty header, because hash uses a pgin
		 * function that will set the header.  Instead, we explicitly
		 * try for the page without CREATE and if that fails, then
		 * create it.
		 */
		if ((ret =
		    mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
			__db_pgerr(file_dbp, argp->pgno, ret);
			goto out;
		}
		created = modified = 1;
	}

	/* Fix up the allocated page. */
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);

	/*
	 * If an inital allocation is aborted and then reallocated
	 * during an archival restore the log record will have
	 * an LSN for the page but the page will be empty.
	 */
	if (IS_ZERO_LSN(LSN(pagep)))
		cmp_p = 0;
	CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->page_lsn);
	/*
	 * If we we rolled back this allocation previously during an
	 * archive restore, the page may have the LSN of the meta page
	 * at the point of the roll back.  This will be no more
	 * than the LSN of the metadata page at the time of this allocation.
	 * Another special case we have to handle is if we ended up with a
	 * page of all 0's which can happen if we abort between allocating a
	 * page in mpool and initializing it.  In that case, even if we're
	 * undoing, we need to re-initialize the page.
	 */
	if (DB_REDO(op) &&
	    (cmp_p == 0 ||
	    (IS_ZERO_LSN(argp->page_lsn) &&
	    log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
		/* Need to redo update described. */
		switch (argp->ptype) {
		case P_LBTREE:
		case P_LRECNO:
		case P_LDUP:
			level = LEAFLEVEL;
			break;
		default:
			level = 0;
			break;
		}
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, PGNO_INVALID, level, argp->ptype);

		pagep->lsn = *lsnp;
		modified = 1;
	} else if (DB_UNDO(op) && (cmp_n == 0 || created)) {
		/*
		 * This is where we handle the case of a 0'd page (pagep->pgno
		 * is equal to PGNO_INVALID).
		 * Undo the allocation, reinitialize the page and
		 * link its next pointer to the free list.
		 */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);

		pagep->lsn = argp->page_lsn;
		modified = 1;
	}

	/*
	 * If the page was newly created, put it on the limbo list.
	 */
	if (IS_ZERO_LSN(LSN(pagep)) &&
	    IS_ZERO_LSN(argp->page_lsn) && DB_UNDO(op)) {
		/* Put the page in limbo.*/
		if ((ret = __db_add_limbo(dbenv,
		    info, argp->fileid, argp->pgno, 1)) != 0)
			goto out;
	}

	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	pagep = NULL;

	/* Fix up the metadata page. */
	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Need to redo update described. */
		LSN(meta) = *lsnp;
		meta->free = argp->next;
		modified = 1;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		/* Need to undo update described. */
		LSN(meta) = argp->meta_lsn;

		/*
		 * If the page has a zero LSN then its newly created
		 * and will go into limbo rather than directly on the
		 * free list.
		 */
		if (!IS_ZERO_LSN(argp->page_lsn))
			meta->free = argp->pgno;
		modified = 1;
	}
	if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	meta = NULL;
	/*
	 * This could be the metapage from a subdb which is read from disk
	 * to recover its creation.
	 */
	if (F_ISSET(file_dbp, DB_AM_SUBDB))
		switch (argp->type) {
		case P_BTREEMETA:
		case P_HASHMETA:
		case P_QAMMETA:
			file_dbp->sync(file_dbp, 0);
			break;
		}

done:	*lsnp = argp->prev_lsn;
	ret = 0;

out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	if (meta != NULL)
		(void)mpf->put(mpf, meta, 0);
	if (ret == ENOENT && op == DB_TXN_BACKWARD_ALLOC)
		ret = 0;
	REC_CLOSE;
}

/*
 * __db_pg_free_recover --
 *	Recovery function for pg_free.
 *
 * PUBLIC: int __db_pg_free_recover
 * PUBLIC:   __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_pg_free_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_pg_free_args *argp;
	DB *file_dbp;
	DBC *dbc;
	DBMETA *meta;
	DB_LSN copy_lsn;
	DB_MPOOLFILE *mpf;
	PAGE *pagep;
	db_pgno_t pgno;
	int cmp_n, cmp_p, modified, ret;

	COMPQUIET(info, NULL);
	meta = NULL;
	pagep = NULL;
	REC_PRINT(__db_pg_free_print);
	REC_INTRO(__db_pg_free_read, 1);

	/*
	 * Fix up the freed page.  If we're redoing the operation we get the
	 * page and explicitly discard its contents, then update its LSN.  If
	 * we're undoing the operation, we get the page and restore its header.
	 * Create the page if necessary, we may be freeing an aborted
	 * create.
	 */
	if ((ret = mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
		goto out;
	modified = 0;
	(void)__ua_memcpy(&copy_lsn, &LSN(argp->header.data), sizeof(DB_LSN));
	cmp_n = log_compare(lsnp, &LSN(pagep));
	cmp_p = log_compare(&LSN(pagep), &copy_lsn);
	CHECK_LSN(op, cmp_p, &LSN(pagep), &copy_lsn);
	if (DB_REDO(op) &&
	    (cmp_p == 0 ||
	    (IS_ZERO_LSN(copy_lsn) &&
	    log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
		/* Need to redo update described. */
		P_INIT(pagep, file_dbp->pgsize,
		    argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
		pagep->lsn = *lsnp;

		modified = 1;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		/* Need to undo update described. */
		memcpy(pagep, argp->header.data, argp->header.size);

		modified = 1;
	}
	if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	pagep = NULL;

	/*
	 * Fix up the metadata page.  If we're redoing or undoing the operation
	 * we get the page and update its LSN and free pointer.
	 */
	pgno = PGNO_BASE_MD;
	if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
		/* The metadata page must always exist. */
		__db_pgerr(file_dbp, pgno, ret);
		goto out;
	}

	modified = 0;
	cmp_n = log_compare(lsnp, &LSN(meta));
	cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
	CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
	if (cmp_p == 0 && DB_REDO(op)) {
		/* Need to redo the deallocation. */
		meta->free = argp->pgno;
		LSN(meta) = *lsnp;
		modified = 1;
	} else if (cmp_n == 0 && DB_UNDO(op)) {
		/* Need to undo the deallocation. */
		meta->free = argp->next;
		LSN(meta) = argp->meta_lsn;
		modified = 1;
	}
	if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
		goto out;
	meta = NULL;

done:	*lsnp = argp->prev_lsn;
	ret = 0;

out:	if (pagep != NULL)
		(void)mpf->put(mpf, pagep, 0);
	if (meta != NULL)
		(void)mpf->put(mpf, meta, 0);
	REC_CLOSE;
}

/*
 * __db_cksum_recover --
 *	Recovery function for checksum failure log record.
 *
 * PUBLIC: int __db_cksum_recover __P((DB_ENV *,
 * PUBLIC:      DBT *, DB_LSN *, db_recops, void *));
 */
int
__db_cksum_recover(dbenv, dbtp, lsnp, op, info)
	DB_ENV *dbenv;
	DBT *dbtp;
	DB_LSN *lsnp;
	db_recops op;
	void *info;
{
	__db_cksum_args *argp;

	int ret;

	COMPQUIET(info, NULL);
	COMPQUIET(lsnp, NULL);
	COMPQUIET(op, DB_TXN_ABORT);

	REC_PRINT(__db_cksum_print);

	if ((ret = __db_cksum_read(dbenv, dbtp->data, &argp)) != 0)
		return (ret);

	/*
	 * We had a checksum failure -- the only option is to run catastrophic
	 * recovery.
	 */
	if (F_ISSET(dbenv, DB_ENV_FATAL))
		ret = 0;
	else {
		__db_err(dbenv,
		    "Checksum failure requires catastrophic recovery");
		ret = __db_panic(dbenv, DB_RUNRECOVERY);
	}

	__os_free(dbenv, argp);
	return (ret);
}