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-rw-r--r--db2/xa/xa.c682
1 files changed, 0 insertions, 682 deletions
diff --git a/db2/xa/xa.c b/db2/xa/xa.c
deleted file mode 100644
index 94a96e7e09..0000000000
--- a/db2/xa/xa.c
+++ /dev/null
@@ -1,682 +0,0 @@
-/*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1998
- * Sleepycat Software. All rights reserved.
- */
-
-/* XXX Remove the global transaction and hang it off the environment. */
-#include "config.h"
-
-#ifndef lint
-static const char sccsid[] = "@(#)xa.c 10.4 (Sleepycat) 10/11/98";
-#endif /* not lint */
-
-#ifndef NO_SYSTEM_INCLUDES
-#include <sys/types.h>
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-#endif
-
-#include "db_int.h"
-#include "db_page.h"
-#include "shqueue.h"
-#include "log.h"
-#include "txn.h"
-#include "db_auto.h"
-#include "db_ext.h"
-#include "db_dispatch.h"
-
-static int __db_xa_close __P((char *, int, long));
-static int __db_xa_commit __P((XID *, int, long));
-static int __db_xa_complete __P((int *, int *, int, long));
-static int __db_xa_end __P((XID *, int, long));
-static int __db_xa_forget __P((XID *, int, long));
-static int __db_xa_open __P((char *, int, long));
-static int __db_xa_prepare __P((XID *, int, long));
-static int __db_xa_recover __P((XID *, long, int, long));
-static int __db_xa_rollback __P((XID *, int, long));
-static int __db_xa_start __P((XID *, int, long));
-static void __xa_txn_end __P((DB_ENV *));
-static void __xa_txn_init __P((DB_ENV *, TXN_DETAIL *, size_t));
-
-/*
- * Possible flag values:
- * Dynamic registration 0 => no dynamic registration
- * TMREGISTER => dynamic registration
- * Asynchronous operation 0 => no support for asynchrony
- * TMUSEASYNC => async support
- * Migration support 0 => migration of transactions across
- * threads is possible
- * TMNOMIGRATE => no migration across threads
- */
-const struct xa_switch_t db_xa_switch = {
- "Berkeley DB", /* name[RMNAMESZ] */
- TMNOMIGRATE, /* flags */
- 0, /* version */
- __db_xa_open, /* xa_open_entry */
- __db_xa_close, /* xa_close_entry */
- __db_xa_start, /* xa_start_entry */
- __db_xa_end, /* xa_end_entry */
- __db_xa_rollback, /* xa_rollback_entry */
- __db_xa_prepare, /* xa_prepare_entry */
- __db_xa_commit, /* xa_commit_entry */
- __db_xa_recover, /* xa_recover_entry */
- __db_xa_forget, /* xa_forget_entry */
- __db_xa_complete /* xa_complete_entry */
-};
-
-/*
- * __db_xa_open --
- * The open call in the XA protocol. The rmid field is an id number
- * that the TM assigned us and will pass us on every xa call. We need to
- * map that rmid number into a dbenv structure that we create during
- * initialization. Since this id number is thread specific, we do not
- * need to store it in shared memory. The file xa_map.c implements all
- * such xa->db mappings.
- * The xa_info field is instance specific information. We require
- * that the value of DB_HOME be passed in xa_info. Since xa_info is the
- * only thing that we get to pass to db_appinit, any config information
- * will have to be done via a config file instead of via the db_appinit
- * call.
- */
-static int
-__db_xa_open(xa_info, rmid, flags)
- char *xa_info;
- int rmid;
- long flags;
-{
- DB_ENV *env;
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
- if (flags != TMNOFLAGS)
- return (XAER_INVAL);
-
- /* Verify if we already have this environment open. */
- if (__db_rmid_to_env(rmid, &env, 0) == 0)
- return (XA_OK);
-
- /*
- * Since we cannot tell whether the environment is OK or not,
- * we can't actually do the db_appinit in xa_open. Instead,
- * we save the mapping between the rmid and the xa_info. If
- * we next get a call to __xa_recover, we do the db_appinit
- * with DB_RECOVER set. If we get any other call, then we
- * do the db_appinit.
- */
- return (__db_map_rmid_name(rmid, xa_info));
-}
-
-/*
- * __db_xa_close --
- * The close call of the XA protocol. The only trickiness here
- * is that if there are any active transactions, we must fail. It is
- * *not* an error to call close on an environment that has already been
- * closed (I am interpreting that to mean it's OK to call close on an
- * environment that has never been opened).
- */
-static int
-__db_xa_close(xa_info, rmid, flags)
- char *xa_info;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- int ret, t_ret;
-
- COMPQUIET(xa_info, NULL);
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
- if (flags != TMNOFLAGS)
- return (XAER_INVAL);
-
- /* If the environment is closed, then we're done. */
- if (__db_rmid_to_env(rmid, &env, 0) != 0)
- return (XA_OK);
-
- /* Check if there are any pending transactions. */
- if (env->xa_txn != NULL && env->xa_txn->txnid != TXN_INVALID)
- return (XAER_PROTO);
-
- /* Now, destroy the mapping and close the environment. */
- ret = __db_unmap_rmid(rmid);
- if ((t_ret = db_appexit(env)) != 0 && ret == 0)
- ret = t_ret;
-
- __os_free(env, sizeof(DB_ENV));
-
- return (ret == 0 ? XA_OK : XAER_RMERR);
-}
-
-/*
- * __db_xa_start --
- * Begin a transaction for the current resource manager.
- */
-static int
-__db_xa_start(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- TXN_DETAIL *td;
- size_t off;
- int is_known;
-
-#define OK_FLAGS (TMJOIN | TMRESUME | TMNOWAIT | TMASYNC | TMNOFLAGS)
- if (LF_ISSET(~OK_FLAGS))
- return (XAER_INVAL);
-
- if (LF_ISSET(TMJOIN) && LF_ISSET(TMRESUME))
- return (XAER_INVAL);
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
-
- if (__db_rmid_to_env(rmid, &env, 1) != 0)
- return (XAER_PROTO);
-
- is_known = __db_xid_to_txn(env, xid, &off) == 0;
-
- if (is_known && !LF_ISSET(TMRESUME) && !LF_ISSET(TMJOIN))
- return (XAER_DUPID);
-
- if (!is_known && LF_ISSET(TMRESUME | TMJOIN))
- return (XAER_NOTA);
-
- /*
- * This can't block, so we can ignore TMNOWAIT.
- *
- * Other error conditions: RMERR, RMFAIL, OUTSIDE, PROTO, RB*
- */
- if (is_known) {
- td = (TXN_DETAIL *)((u_int8_t *)env->tx_info->region + off);
- if (td->xa_status == TXN_XA_SUSPENDED && !LF_SET(TMRESUME))
- return (XAER_PROTO);
- if (td->xa_status == TXN_XA_DEADLOCKED)
- return (XA_RBDEADLOCK);
- if (td->xa_status == TXN_XA_ABORTED)
- return (XA_RBOTHER);
-
- /* Now, fill in the global transaction structure. */
- __xa_txn_init(env, td, off);
- td->xa_status = TXN_XA_STARTED;
- } else {
- if (__txn_xa_begin(env, env->xa_txn) != 0)
- return (XAER_RMERR);
- (void)__db_map_xid(env, xid, env->xa_txn->off);
- td = (TXN_DETAIL *)
- ((u_int8_t *)env->tx_info->region + env->xa_txn->off);
- td->xa_status = TXN_XA_STARTED;
- }
- return (XA_OK);
-}
-
-/*
- * __db_xa_end --
- * Disassociate the current transaction from the current process.
- */
-static int
-__db_xa_end(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- DB_TXN *txn;
- TXN_DETAIL *td;
- size_t off;
-
- if (flags != TMNOFLAGS && !LF_ISSET(TMSUSPEND | TMSUCCESS | TMFAIL))
- return (XAER_INVAL);
-
- if (__db_rmid_to_env(rmid, &env, 0) != 0)
- return (XAER_PROTO);
-
- if (__db_xid_to_txn(env, xid, &off) != 0)
- return (XAER_NOTA);
-
- txn = env->xa_txn;
- if (off != txn->off)
- return (XAER_PROTO);
-
- td = (TXN_DETAIL *)((u_int8_t *)env->tx_info->region + off);
- if (td->xa_status == TXN_XA_DEADLOCKED)
- return (XA_RBDEADLOCK);
-
- if (td->status == TXN_ABORTED)
- return (XA_RBOTHER);
-
- if (td->xa_status != TXN_XA_STARTED)
- return (XAER_PROTO);
-
- /* Update the shared memory last_lsn field */
- td->last_lsn = txn->last_lsn;
-
- /*
- * If we ever support XA migration, we cannot keep SUSPEND/END
- * status in the shared region; it would have to be process local.
- */
- if (LF_ISSET(TMSUSPEND))
- td->xa_status = TXN_XA_SUSPENDED;
- else
- td->xa_status = TXN_XA_ENDED;
-
- txn->txnid = TXN_INVALID;
- return (XA_OK);
-}
-
-/*
- * __db_xa_prepare --
- * Sync the log to disk so we can guarantee recoverability.
- */
-static int
-__db_xa_prepare(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- TXN_DETAIL *td;
- size_t off;
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
- if (flags != TMNOFLAGS)
- return (XAER_INVAL);
-
- /*
- * We need to know if we've ever called prepare on this.
- * As part of the prepare, we set the xa_status field to
- * reflect that fact that prepare has been called, and if
- * it's ever called again, it's an error.
- */
- if (__db_rmid_to_env(rmid, &env, 1) != 0)
- return (XAER_PROTO);
-
- if (__db_xid_to_txn(env, xid, &off) != 0)
- return (XAER_NOTA);
-
- td = (TXN_DETAIL *)((u_int8_t *)env->tx_info->region + off);
-
- if (td->xa_status == TXN_XA_DEADLOCKED)
- return (XA_RBDEADLOCK);
-
- if (td->xa_status != TXN_XA_ENDED && td->xa_status != TXN_XA_SUSPENDED)
- return (XAER_PROTO);
-
- /* Now, fill in the global transaction structure. */
- __xa_txn_init(env, td, off);
-
- if (txn_prepare(env->xa_txn) != 0)
- return (XAER_RMERR);
-
- td->xa_status = TXN_XA_PREPARED;
-
- /* No fatal value that would require an XAER_RMFAIL. */
- __xa_txn_end(env);
- return (XA_OK);
-}
-
-/*
- * __db_xa_commit --
- * Commit the transaction
- */
-static int
-__db_xa_commit(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- TXN_DETAIL *td;
- size_t off;
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
-#undef OK_FLAGS
-#define OK_FLAGS (TMNOFLAGS | TMNOWAIT | TMONEPHASE)
- if (LF_ISSET(~OK_FLAGS))
- return (XAER_INVAL);
-
- /*
- * We need to know if we've ever called prepare on this.
- * We can verify this by examining the xa_status field.
- */
- if (__db_rmid_to_env(rmid, &env, 1) != 0)
- return (XAER_PROTO);
-
- if (__db_xid_to_txn(env, xid, &off) != 0)
- return (XAER_NOTA);
-
- td = (TXN_DETAIL *)((u_int8_t *)env->tx_info->region + off);
-
- if (td->xa_status == TXN_XA_DEADLOCKED)
- return (XA_RBDEADLOCK);
-
- if (td->xa_status == TXN_XA_ABORTED)
- return (XA_RBOTHER);
-
- if (LF_SET(TMONEPHASE) &&
- td->xa_status != TXN_XA_ENDED && td->xa_status != TXN_XA_SUSPENDED)
- return (XAER_PROTO);
-
- if (!LF_SET(TMONEPHASE) && td->xa_status != TXN_XA_PREPARED)
- return (XAER_PROTO);
-
- /* Now, fill in the global transaction structure. */
- __xa_txn_init(env, td, off);
-
- if (txn_commit(env->xa_txn) != 0)
- return (XAER_RMERR);
-
- /* No fatal value that would require an XAER_RMFAIL. */
- __xa_txn_end(env);
- return (XA_OK);
-}
-
-/*
- * __db_xa_recover --
- * Returns a list of prepared and heuristically completed transactions.
- *
- * The return value is the number of xids placed into the xid array (less
- * than or equal to the count parameter). The flags are going to indicate
- * whether we are starting a scan or continuing one.
- */
-static int
-__db_xa_recover(xids, count, rmid, flags)
- XID *xids;
- long count, flags;
- int rmid;
-{
- __txn_xa_regop_args *argp;
- DBT data;
- DB_ENV *env;
- DB_LOG *log;
- XID *xidp;
- char *dbhome;
- int err, ret;
- u_int32_t rectype, txnid;
-
- ret = 0;
- xidp = xids;
-
-
- /*
- * If we are starting a scan, then we need to open the environment
- * and run recovery. This recovery puts us in a state where we can
- * either commit or abort any transactions that were prepared but not
- * yet committed. Once we've done that, we need to figure out where
- * to begin checking for such transactions. If we are not starting
- * a scan, then the environment had better have already been recovered
- * and we'll start from * wherever the log cursor is. Since XA apps
- * cannot be threaded, we don't have to worry about someone else
- * having moved it.
- */
- if (LF_ISSET(TMSTARTRSCAN)) {
- /* If the environment is open, we have a problem. */
- if (__db_rmid_to_env(rmid, &env, 0) == XA_OK)
- return (XAER_PROTO);
-
- if ((ret = __os_calloc(1, sizeof(DB_ENV), &env)) != 0)
- return (XAER_RMERR);
-
- if (__db_rmid_to_name(rmid, &dbhome) != 0)
- goto err1;
-
-#undef XA_FLAGS
-#define XA_FLAGS DB_RECOVER | \
- DB_CREATE | DB_INIT_LOCK | DB_INIT_LOG | DB_INIT_MPOOL | DB_INIT_TXN
- if ((ret = db_appinit(dbhome, NULL, env, XA_FLAGS)) != 0)
- goto err1;
-
- if (__db_map_rmid(rmid, env) != 0)
- goto err2;
-
- /* Now figure out from where to begin scan. */
- log = env->lg_info;
- if ((err = __log_findckp(log, &log->xa_first)) == DB_NOTFOUND) {
- /*
- * If there were no log files, then we have no
- * transactions to return, so we simply return 0.
- */
- return (0);
- }
- if ((err = __db_txnlist_init(&log->xa_info)) != 0)
- goto err3;
- } else {
- /* We had better already know about this rmid. */
- if (__db_rmid_to_env(rmid, &env, 0) != 0)
- return (XAER_PROTO);
- /*
- * If we are not starting a scan, the log cursor had
- * better be set.
- */
- log = env->lg_info;
- if (IS_ZERO_LSN(log->xa_lsn))
- return (XAER_PROTO);
- }
-
- /*
- * At this point log->xa_first contains the point in the log
- * to which we need to roll back. If we are starting a scan,
- * we'll start at the last record; if we're continuing a scan,
- * we'll have to start at log->xa_lsn.
- */
-
- memset(&data, 0, sizeof(data));
- for (err = log_get(log, &log->xa_lsn, &data,
- LF_ISSET(TMSTARTRSCAN) ? DB_LAST : DB_SET);
- err == 0 && log_compare(&log->xa_lsn, &log->xa_first) > 0;
- err = log_get(log, &log->xa_lsn, &data, DB_PREV)) {
- memcpy(&rectype, data.data, sizeof(rectype));
-
- /*
- * The only record type we care about is an DB_txn_xa_regop.
- * If it's a commit, we have to add it to a txnlist. If it's
- * a prepare, and we don't have a commit, then we return it.
- * We are redoing some of what's in the xa_regop_recovery
- * code, but we have to do it here so we can get at the xid
- * in the record.
- */
- if (rectype != DB_txn_xa_regop && rectype != DB_txn_regop)
- continue;
-
- memcpy(&txnid, (u_int8_t *)data.data + sizeof(rectype),
- sizeof(txnid));
- err = __db_txnlist_find(log->xa_info, txnid);
- switch (rectype) {
- case DB_txn_regop:
- if (err == DB_NOTFOUND)
- __db_txnlist_add(log->xa_info, txnid);
- err = 0;
- break;
- case DB_txn_xa_regop:
- /*
- * This transaction is commited, so we needn't read
- * the record and do anything.
- */
- if (err == 0)
- break;
- if ((err =
- __txn_xa_regop_read(data.data, &argp)) != 0) {
- ret = XAER_RMERR;
- goto out;
- }
-
- xidp->formatID = argp->formatID;
- xidp->gtrid_length = argp->gtrid;
- xidp->bqual_length = argp->bqual;
- memcpy(xidp->data, argp->xid.data, argp->xid.size);
- ret++;
- xidp++;
- __os_free(argp, sizeof(*argp));
- if (ret == count)
- goto done;
- break;
- }
- }
-
- if (err != 0 && err != DB_NOTFOUND)
- goto out;
-
-done: if (LF_ISSET(TMENDRSCAN)) {
- ZERO_LSN(log->xa_lsn);
- ZERO_LSN(log->xa_first);
-
-out: __db_txnlist_end(log->xa_info);
- log->xa_info = NULL;
- }
- return (ret);
-
-err3: (void)__db_unmap_rmid(rmid);
-err2: (void)db_appexit(env);
-err1: __os_free(env, sizeof(DB_ENV));
- return (XAER_RMERR);
-}
-
-/*
- * __db_xa_rollback
- * Abort an XA transaction.
- */
-static int
-__db_xa_rollback(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- TXN_DETAIL *td;
- size_t off;
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
- if (flags != TMNOFLAGS)
- return (XAER_INVAL);
-
- if (__db_rmid_to_env(rmid, &env, 1) != 0)
- return (XAER_PROTO);
-
- if (__db_xid_to_txn(env, xid, &off) != 0)
- return (XAER_NOTA);
-
- td = (TXN_DETAIL *)((u_int8_t *)env->tx_info->region + off);
-
- if (td->xa_status == TXN_XA_DEADLOCKED)
- return (XA_RBDEADLOCK);
-
- if (td->xa_status == TXN_XA_ABORTED)
- return (XA_RBOTHER);
-
- if (LF_SET(TMONEPHASE) &&
- td->xa_status != TXN_XA_ENDED && td->xa_status != TXN_XA_SUSPENDED)
- return (XAER_PROTO);
-
- if (!LF_SET(TMONEPHASE) && td->xa_status != TXN_XA_PREPARED)
- return (XAER_PROTO);
-
- /* Now, fill in the global transaction structure. */
- __xa_txn_init(env, td, off);
- if (txn_abort(env->xa_txn) != 0)
- return (XAER_RMERR);
-
- /* No fatal value that would require an XAER_RMFAIL. */
- __xa_txn_end(env);
- return (XA_OK);
-}
-
-/*
- * __db_xa_forget --
- * Forget about an XID for a transaction that was heuristically
- * completed. Since we do not heuristically complete anything, I
- * don't think we have to do anything here, but we should make sure
- * that we reclaim the slots in the txnid table.
- */
-static int
-__db_xa_forget(xid, rmid, flags)
- XID *xid;
- int rmid;
- long flags;
-{
- DB_ENV *env;
- size_t off;
-
- if (LF_ISSET(TMASYNC))
- return (XAER_ASYNC);
- if (flags != TMNOFLAGS)
- return (XAER_INVAL);
-
- if (__db_rmid_to_env(rmid, &env, 1) != 0)
- return (XAER_PROTO);
-
- /*
- * If mapping is gone, then we're done.
- */
- if (__db_xid_to_txn(env, xid, &off) != 0)
- return (XA_OK);
-
- __db_unmap_xid(env, xid, off);
-
- /* No fatal value that would require an XAER_RMFAIL. */
- return (XA_OK);
-}
-
-/*
- * __db_xa_complete --
- * Used to wait for asynchronous operations to complete. Since we're
- * not doing asynch, this is an invalid operation.
- */
-static int
-__db_xa_complete(handle, retval, rmid, flags)
- int *handle, *retval, rmid;
- long flags;
-{
- COMPQUIET(handle, NULL);
- COMPQUIET(retval, NULL);
- COMPQUIET(rmid, 0);
- COMPQUIET(flags, 0);
-
- return (XAER_INVAL);
-}
-
-/*
- * __xa_txn_init --
- * Fill in the fields of the local transaction structure given
- * the detail transaction structure.
- */
-static void
-__xa_txn_init(env, td, off)
- DB_ENV *env;
- TXN_DETAIL *td;
- size_t off;
-{
- DB_TXN *txn;
-
- txn = env->xa_txn;
- txn->mgrp = env->tx_info;
- txn->parent = NULL;
- txn->last_lsn = td->last_lsn;
- txn->txnid = td->txnid;
- txn->off = off;
- txn->flags = 0;
-}
-
-/*
- * __xa_txn_end --
- * Invalidate a transaction structure that was generated by xa_txn_init.
- */
-static void
-__xa_txn_end(env)
- DB_ENV *env;
-{
- DB_TXN *txn;
-
- txn = env->xa_txn;
- if (txn != NULL)
- txn->txnid = TXN_INVALID;
-}
-