297 lines
7.8 KiB
C
297 lines
7.8 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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/*
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* Copyright (c) 1996
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* The President and Fellows of Harvard University. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)txn_rec.c 10.15 (Sleepycat) 1/3/99";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#endif
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#include "db_int.h"
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#include "db_page.h"
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#include "shqueue.h"
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#include "txn.h"
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#include "db_am.h"
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#include "log.h"
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#include "common_ext.h"
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static int __txn_restore_txn __P((DB_ENV *, DB_LSN *, __txn_xa_regop_args *));
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#define IS_XA_TXN(R) (R->xid.size != 0)
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/*
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* PUBLIC: int __txn_regop_recover
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* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
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*
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* These records are only ever written for commits.
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*/
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int
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__txn_regop_recover(logp, dbtp, lsnp, redo, info)
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DB_LOG *logp;
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DBT *dbtp;
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DB_LSN *lsnp;
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int redo;
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void *info;
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{
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__txn_regop_args *argp;
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int ret;
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#ifdef DEBUG_RECOVER
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(void)__txn_regop_print(logp, dbtp, lsnp, redo, info);
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#endif
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COMPQUIET(redo, 0);
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COMPQUIET(logp, NULL);
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if ((ret = __txn_regop_read(dbtp->data, &argp)) != 0)
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return (ret);
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if (argp->opcode != TXN_COMMIT)
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ret = EINVAL;
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else
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if (__db_txnlist_find(info, argp->txnid->txnid) == DB_NOTFOUND)
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ret = __db_txnlist_add(info, argp->txnid->txnid);
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if (ret == 0)
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*lsnp = argp->prev_lsn;
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__os_free(argp, 0);
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return (ret);
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}
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/*
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* PUBLIC: int __txn_xa_regop_recover
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* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
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*
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* These records are only ever written for prepares.
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*/
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int
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__txn_xa_regop_recover(logp, dbtp, lsnp, redo, info)
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DB_LOG *logp;
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DBT *dbtp;
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DB_LSN *lsnp;
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int redo;
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void *info;
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{
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__txn_xa_regop_args *argp;
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int ret;
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#ifdef DEBUG_RECOVER
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(void)__txn_xa_regop_print(logp, dbtp, lsnp, redo, info);
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#endif
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COMPQUIET(redo, 0);
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COMPQUIET(logp, NULL);
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if ((ret = __txn_xa_regop_read(dbtp->data, &argp)) != 0)
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return (ret);
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if (argp->opcode != TXN_PREPARE)
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ret = EINVAL;
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else {
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/*
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* Whether we are in XA or not, we need to call
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* __db_txnlist_find so that we update the maxid.
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* If this is an XA transaction, then we treat
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* prepares like commits so that we roll forward to
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* a point where we can handle commit/abort calls
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* from the TMS. If this isn't XA, then a prepare
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* is treated like a No-op; we only care about the
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* commit.
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*/
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ret = __db_txnlist_find(info, argp->txnid->txnid);
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if (IS_XA_TXN(argp) && ret == DB_NOTFOUND) {
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/*
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* This is an XA prepared, but not yet committed
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* transaction. We need to add it to the
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* transaction list, so that it gets rolled
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* forward. We also have to add it to the region's
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* internal state so it can be properly aborted
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* or recovered.
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*/
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ret = __db_txnlist_add(info, argp->txnid->txnid);
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if (ret == 0)
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ret = __txn_restore_txn(logp->dbenv,
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lsnp, argp);
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}
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}
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if (ret == 0)
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*lsnp = argp->prev_lsn;
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__os_free(argp, 0);
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return (ret);
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}
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/*
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* PUBLIC: int __txn_ckp_recover __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
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*/
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int
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__txn_ckp_recover(logp, dbtp, lsnp, redo, info)
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DB_LOG *logp;
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DBT *dbtp;
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DB_LSN *lsnp;
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int redo;
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void *info;
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{
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__txn_ckp_args *argp;
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int ret;
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#ifdef DEBUG_RECOVER
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__txn_ckp_print(logp, dbtp, lsnp, redo, info);
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#endif
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COMPQUIET(logp, NULL);
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if ((ret = __txn_ckp_read(dbtp->data, &argp)) != 0)
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return (ret);
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/*
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* Check for 'restart' checkpoint record. This occurs when the
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* checkpoint lsn is equal to the lsn of the checkpoint record
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* and means that we could set the transaction ID back to 1, so
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* that we don't exhaust the transaction ID name space.
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*/
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if (argp->ckp_lsn.file == lsnp->file &&
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argp->ckp_lsn.offset == lsnp->offset)
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__db_txnlist_gen(info, redo ? -1 : 1);
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*lsnp = argp->last_ckp;
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__os_free(argp, 0);
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return (DB_TXN_CKP);
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}
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/*
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* __txn_child_recover
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* Recover a commit record for a child transaction.
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*
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* PUBLIC: int __txn_child_recover
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* PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *));
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*/
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int
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__txn_child_recover(logp, dbtp, lsnp, redo, info)
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DB_LOG *logp;
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DBT *dbtp;
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DB_LSN *lsnp;
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int redo;
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void *info;
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{
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__txn_child_args *argp;
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int ret;
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#ifdef DEBUG_RECOVER
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(void)__txn_child_print(logp, dbtp, lsnp, redo, info);
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#endif
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COMPQUIET(redo, 0);
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COMPQUIET(logp, NULL);
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if ((ret = __txn_child_read(dbtp->data, &argp)) != 0)
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return (ret);
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/*
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* We count the child as committed only if its parent committed.
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* So, if we are not yet in the transaction list, but our parent
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* is, then we should go ahead and commit.
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*/
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if (argp->opcode != TXN_COMMIT)
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ret = EINVAL;
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else
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if (__db_txnlist_find(info, argp->parent) == 0 &&
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__db_txnlist_find(info, argp->txnid->txnid) == DB_NOTFOUND)
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ret = __db_txnlist_add(info, argp->txnid->txnid);
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if (ret == 0)
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*lsnp = argp->prev_lsn;
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__os_free(argp, 0);
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return (ret);
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}
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/*
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* __txn_restore_txn --
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* Using only during XA recovery. If we find any transactions that are
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* prepared, but not yet committed, then we need to restore the transaction's
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* state into the shared region, because the TM is going to issue a txn_abort
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* or txn_commit and we need to respond correctly.
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*
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* lsnp is the LSN of the returned LSN
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* argp is the perpare record (in an appropriate structure)
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*/
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static int
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__txn_restore_txn(dbenv, lsnp, argp)
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DB_ENV *dbenv;
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DB_LSN *lsnp;
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__txn_xa_regop_args *argp;
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{
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DB_TXNMGR *mgr;
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TXN_DETAIL *td;
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int ret;
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if (argp->xid.size == 0)
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return(0);
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mgr = dbenv->tx_info;
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LOCK_TXNREGION(mgr);
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/* Allocate a new transaction detail structure. */
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if ((ret = __db_shalloc(mgr->mem, sizeof(TXN_DETAIL), 0, &td)) != 0)
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return (ret);
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/* Place transaction on active transaction list. */
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SH_TAILQ_INSERT_HEAD(&mgr->region->active_txn, td, links, __txn_detail);
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td->txnid = argp->txnid->txnid;
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td->begin_lsn = argp->begin_lsn;
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td->last_lsn = *lsnp;
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td->last_lock = 0;
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td->parent = 0;
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td->status = TXN_PREPARED;
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td->xa_status = TXN_XA_PREPARED;
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memcpy(td->xid, argp->xid.data, argp->xid.size);
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td->bqual = argp->bqual;
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td->gtrid = argp->gtrid;
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td->format = argp->formatID;
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UNLOCK_TXNREGION(mgr);
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return (0);
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}
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