txn_rec.c
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上传日期:2022-05-23
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文件大小:12k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- /*
- * Copyright (c) 1996
- * The President and Fellows of Harvard University. All rights reserved.
- *
- * 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: txn_rec.c,v 11.41 2002/08/06 04:42:37 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_page.h"
- #include "dbinc/txn.h"
- #include "dbinc/db_am.h"
- #include "dbinc/db_dispatch.h"
- #define IS_XA_TXN(R) (R->xid.size != 0)
- /*
- * PUBLIC: int __txn_regop_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- *
- * These records are only ever written for commits. Normally, we redo any
- * committed transaction, however if we are doing recovery to a timestamp, then
- * we may treat transactions that commited after the timestamp as aborted.
- */
- int
- __txn_regop_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- DB_TXNHEAD *headp;
- __txn_regop_args *argp;
- int ret;
- #ifdef DEBUG_RECOVER
- (void)__txn_regop_print(dbenv, dbtp, lsnp, op, info);
- #endif
- if ((ret = __txn_regop_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- headp = info;
- /*
- * We are only ever called during FORWARD_ROLL or BACKWARD_ROLL.
- * We check for the former explicitly and the last two clauses
- * apply to the BACKWARD_ROLL case.
- */
- if (op == DB_TXN_FORWARD_ROLL)
- /*
- * If this was a 2-phase-commit transaction, then it
- * might already have been removed from the list, and
- * that's OK. Ignore the return code from remove.
- */
- (void)__db_txnlist_remove(dbenv, info, argp->txnid->txnid);
- else if ((dbenv->tx_timestamp != 0 &&
- argp->timestamp > (int32_t)dbenv->tx_timestamp) ||
- (!IS_ZERO_LSN(headp->trunc_lsn) &&
- log_compare(&headp->trunc_lsn, lsnp) < 0)) {
- /*
- * We failed either the timestamp check or the trunc_lsn check,
- * so we treat this as an abort even if it was a commit record.
- */
- ret = __db_txnlist_update(dbenv,
- info, argp->txnid->txnid, TXN_ABORT, NULL);
- if (ret == TXN_NOTFOUND)
- ret = __db_txnlist_add(dbenv,
- info, argp->txnid->txnid, TXN_IGNORE, NULL);
- else if (ret != TXN_OK)
- goto err;
- /* else ret = 0; Not necessary because TXN_OK == 0 */
- } else {
- /* This is a normal commit; mark it appropriately. */
- ret = __db_txnlist_update(dbenv,
- info, argp->txnid->txnid, argp->opcode, lsnp);
- if (ret == TXN_NOTFOUND)
- ret = __db_txnlist_add(dbenv,
- info, argp->txnid->txnid,
- argp->opcode == TXN_ABORT ?
- TXN_IGNORE : argp->opcode, lsnp);
- else if (ret != TXN_OK)
- goto err;
- /* else ret = 0; Not necessary because TXN_OK == 0 */
- }
- if (ret == 0)
- *lsnp = argp->prev_lsn;
- if (0) {
- err: __db_err(dbenv,
- "txnid %lx commit record found, already on commit list",
- argp->txnid->txnid);
- ret = EINVAL;
- }
- __os_free(dbenv, argp);
- return (ret);
- }
- /*
- * PUBLIC: int __txn_xa_regop_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- *
- * These records are only ever written for prepares.
- */
- int
- __txn_xa_regop_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __txn_xa_regop_args *argp;
- int ret;
- #ifdef DEBUG_RECOVER
- (void)__txn_xa_regop_print(dbenv, dbtp, lsnp, op, info);
- #endif
- if ((ret = __txn_xa_regop_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- if (argp->opcode != TXN_PREPARE) {
- ret = EINVAL;
- goto err;
- }
- ret = __db_txnlist_find(dbenv, info, argp->txnid->txnid);
- /*
- * If we are rolling forward, then an aborted prepare
- * indicates that this may the last record we'll see for
- * this transaction ID, so we should remove it from the
- * list.
- */
- if (op == DB_TXN_FORWARD_ROLL) {
- if ((ret = __db_txnlist_remove(dbenv,
- info, argp->txnid->txnid)) != TXN_OK)
- goto txn_err;
- } else if (op == DB_TXN_BACKWARD_ROLL && ret == TXN_PREPARE) {
- /*
- * On the backward pass, we have three possibilities:
- * 1. The transaction is already committed, no-op.
- * 2. The transaction is already aborted, no-op.
- * 3. The transaction is neither committed nor aborted.
- * Treat this like a commit and roll forward so that
- * the transaction can be resurrected in the region.
- * We handle case 3 here; cases 1 and 2 are the final clause
- * below.
- * This is prepared, but not yet committed transaction. We
- * need to add it to the transaction list, so that it gets
- * rolled forward. We also have to add it to the region's
- * internal state so it can be properly aborted or committed
- * after recovery (see txn_recover).
- */
- if ((ret = __db_txnlist_remove(dbenv,
- info, argp->txnid->txnid)) != TXN_OK) {
- txn_err: __db_err(dbenv,
- "Transaction not in list %x", argp->txnid->txnid);
- ret = DB_NOTFOUND;
- } else if ((ret = __db_txnlist_add(dbenv,
- info, argp->txnid->txnid, TXN_COMMIT, lsnp)) == 0)
- ret = __txn_restore_txn(dbenv, lsnp, argp);
- } else
- ret = 0;
- if (ret == 0)
- *lsnp = argp->prev_lsn;
- err: __os_free(dbenv, argp);
- return (ret);
- }
- /*
- * PUBLIC: int __txn_ckp_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __txn_ckp_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __txn_ckp_args *argp;
- int ret;
- #ifdef DEBUG_RECOVER
- __txn_ckp_print(dbenv, dbtp, lsnp, op, info);
- #endif
- COMPQUIET(dbenv, NULL);
- if ((ret = __txn_ckp_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- if (op == DB_TXN_BACKWARD_ROLL)
- __db_txnlist_ckp(dbenv, info, lsnp);
- *lsnp = argp->last_ckp;
- __os_free(dbenv, argp);
- return (DB_TXN_CKP);
- }
- /*
- * __txn_child_recover
- * Recover a commit record for a child transaction.
- *
- * PUBLIC: int __txn_child_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __txn_child_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __txn_child_args *argp;
- int c_stat, p_stat, ret;
- #ifdef DEBUG_RECOVER
- (void)__txn_child_print(dbenv, dbtp, lsnp, op, info);
- #endif
- if ((ret = __txn_child_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- /*
- * This is a record in a PARENT's log trail indicating that a
- * child commited. If we are aborting, we need to update the
- * parent's LSN array. If we are in recovery, then if the
- * parent is commiting, we set ourselves up to commit, else
- * we do nothing.
- */
- if (op == DB_TXN_ABORT) {
- /* Note that __db_txnlist_lsnadd rewrites its LSN
- * parameter, so you cannot reuse the argp->c_lsn field.
- */
- ret = __db_txnlist_lsnadd(dbenv,
- info, &argp->c_lsn, TXNLIST_NEW);
- } else if (op == DB_TXN_BACKWARD_ROLL) {
- /* Child might exist -- look for it. */
- c_stat = __db_txnlist_find(dbenv, info, argp->child);
- p_stat = __db_txnlist_find(dbenv, info, argp->txnid->txnid);
- if (c_stat == TXN_EXPECTED) {
- /*
- * The open after this create succeeded. If the
- * parent succeeded, we don't want to redo; if the
- * parent aborted, we do want to undo.
- */
- ret = __db_txnlist_update(dbenv,
- info, argp->child,
- p_stat == TXN_COMMIT ? TXN_IGNORE : TXN_ABORT,
- NULL);
- if (ret > 0)
- ret = 0;
- } else if (c_stat == TXN_UNEXPECTED) {
- /*
- * The open after this create failed. If the parent
- * is rolling forward, we need to roll forward. If
- * the parent failed, then we do not want to abort
- * (because the file may not be the one in which we
- * are interested).
- */
- ret = __db_txnlist_update(dbenv, info, argp->child,
- p_stat == TXN_COMMIT ? TXN_COMMIT : TXN_IGNORE,
- NULL);
- if (ret > 0)
- ret = 0;
- } else if (c_stat != TXN_IGNORE) {
- ret = __db_txnlist_add(dbenv, info, argp->child,
- p_stat == TXN_COMMIT ? TXN_COMMIT : TXN_ABORT,
- NULL);
- }
- } else {
- /* Forward Roll */
- if ((ret =
- __db_txnlist_remove(dbenv, info, argp->child)) != TXN_OK) {
- __db_err(dbenv,
- "Transaction not in list %x", argp->txnid->txnid);
- ret = DB_NOTFOUND;
- }
- }
- if (ret == 0)
- *lsnp = argp->prev_lsn;
- __os_free(dbenv, argp);
- return (ret);
- }
- /*
- * __txn_restore_txn --
- * Using only during XA recovery. If we find any transactions that are
- * prepared, but not yet committed, then we need to restore the transaction's
- * state into the shared region, because the TM is going to issue an abort
- * or commit and we need to respond correctly.
- *
- * lsnp is the LSN of the returned LSN
- * argp is the perpare record (in an appropriate structure)
- *
- * PUBLIC: int __txn_restore_txn __P((DB_ENV *,
- * PUBLIC: DB_LSN *, __txn_xa_regop_args *));
- */
- int
- __txn_restore_txn(dbenv, lsnp, argp)
- DB_ENV *dbenv;
- DB_LSN *lsnp;
- __txn_xa_regop_args *argp;
- {
- DB_TXNMGR *mgr;
- TXN_DETAIL *td;
- DB_TXNREGION *region;
- int ret;
- if (argp->xid.size == 0)
- return (0);
- mgr = dbenv->tx_handle;
- region = mgr->reginfo.primary;
- R_LOCK(dbenv, &mgr->reginfo);
- /* Allocate a new transaction detail structure. */
- if ((ret =
- __db_shalloc(mgr->reginfo.addr, sizeof(TXN_DETAIL), 0, &td)) != 0) {
- R_UNLOCK(dbenv, &mgr->reginfo);
- return (ret);
- }
- /* Place transaction on active transaction list. */
- SH_TAILQ_INSERT_HEAD(®ion->active_txn, td, links, __txn_detail);
- td->txnid = argp->txnid->txnid;
- td->begin_lsn = argp->begin_lsn;
- td->last_lsn = *lsnp;
- td->parent = 0;
- td->status = TXN_PREPARED;
- td->xa_status = TXN_XA_PREPARED;
- memcpy(td->xid, argp->xid.data, argp->xid.size);
- td->bqual = argp->bqual;
- td->gtrid = argp->gtrid;
- td->format = argp->formatID;
- td->flags = 0;
- F_SET(td, TXN_RESTORED);
- region->stat.st_nrestores++;
- region->stat.st_nactive++;
- if (region->stat.st_nactive > region->stat.st_maxnactive)
- region->stat.st_maxnactive = region->stat.st_nactive;
- R_UNLOCK(dbenv, &mgr->reginfo);
- return (0);
- }
- /*
- * __txn_recycle_recover --
- * Recovery function for recycle.
- *
- * PUBLIC: int __txn_recycle_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __txn_recycle_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __txn_recycle_args *argp;
- int ret;
- #ifdef DEBUG_RECOVER
- (void)__txn_child_print(dbenv, dbtp, lsnp, op, info);
- #endif
- if ((ret = __txn_recycle_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- COMPQUIET(lsnp, NULL);
- if ((ret = __db_txnlist_gen(dbenv, info,
- DB_UNDO(op) ? -1 : 1, argp->min, argp->max)) != 0)
- return (ret);
- __os_free(dbenv, argp);
- return (0);
- }