db_dispatch.c
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上传日期:2007-04-14
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文件大小:24k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- /*
- * Copyright (c) 1995, 1996
- * The President and Fellows of Harvard University. All rights reserved.
- *
- * This code is derived from software contributed to Berkeley by
- * Margo Seltzer.
- *
- * 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: db_dispatch.c,v 11.41 2001/01/11 18:19:50 bostic Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <stddef.h>
- #include <stdlib.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "db_page.h"
- #include "db_dispatch.h"
- #include "db_am.h"
- #include "log_auto.h"
- #include "txn.h"
- #include "txn_auto.h"
- #include "log.h"
- static int __db_txnlist_find_internal __P((void *, db_txnlist_type,
- u_int32_t, u_int8_t [DB_FILE_ID_LEN], DB_TXNLIST **, int));
- /*
- * __db_dispatch --
- *
- * This is the transaction dispatch function used by the db access methods.
- * It is designed to handle the record format used by all the access
- * methods (the one automatically generated by the db_{h,log,read}.sh
- * scripts in the tools directory). An application using a different
- * recovery paradigm will supply a different dispatch function to txn_open.
- *
- * PUBLIC: int __db_dispatch __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_dispatch(dbenv, db, lsnp, redo, info)
- DB_ENV *dbenv; /* The environment. */
- DBT *db; /* The log record upon which to dispatch. */
- DB_LSN *lsnp; /* The lsn of the record being dispatched. */
- db_recops redo; /* Redo this op (or undo it). */
- void *info;
- {
- u_int32_t rectype, txnid;
- int make_call, ret;
- memcpy(&rectype, db->data, sizeof(rectype));
- memcpy(&txnid, (u_int8_t *)db->data + sizeof(rectype), sizeof(txnid));
- make_call = ret = 0;
- /*
- * If we find a record that is in the user's number space and they
- * have specified a recovery routine, let them handle it. If they
- * didn't specify a recovery routine, then we expect that they've
- * followed all our rules and registered new recovery functions.
- */
- switch (redo) {
- case DB_TXN_ABORT:
- /*
- * XXX
- * db_printlog depends on DB_TXN_ABORT not examining the TXN
- * list. If that ever changes, fix db_printlog too.
- */
- make_call = 1;
- break;
- case DB_TXN_OPENFILES:
- if (rectype == DB_log_register)
- return (dbenv->dtab[rectype](dbenv,
- db, lsnp, redo, info));
- break;
- case DB_TXN_BACKWARD_ROLL:
- /*
- * Running full recovery in the backward pass. If we've
- * seen this txnid before and added to it our commit list,
- * then we do nothing during this pass, unless this is a child
- * commit record, in which case we need to process it. If
- * we've never seen it, then we call the appropriate recovery
- * routine.
- *
- * We need to always undo DB_db_noop records, so that we
- * properly handle any aborts before the file was closed.
- */
- if (rectype == DB_log_register ||
- rectype == DB_txn_ckp || rectype == DB_db_noop
- || rectype == DB_txn_child || (txnid != 0 &&
- (ret = __db_txnlist_find(info, txnid)) != 0)) {
- make_call = 1;
- if (ret == DB_NOTFOUND && rectype != DB_txn_regop &&
- rectype != DB_txn_xa_regop && (ret =
- __db_txnlist_add(dbenv, info, txnid, 1)) != 0)
- return (ret);
- }
- break;
- case DB_TXN_FORWARD_ROLL:
- /*
- * In the forward pass, if we haven't seen the transaction,
- * do nothing, else recovery it.
- *
- * We need to always redo DB_db_noop records, so that we
- * properly handle any commits after the file was closed.
- */
- if (rectype == DB_log_register ||
- rectype == DB_txn_ckp ||
- rectype == DB_db_noop ||
- __db_txnlist_find(info, txnid) == 0)
- make_call = 1;
- break;
- default:
- return (__db_unknown_flag(dbenv, "__db_dispatch", redo));
- }
- if (make_call) {
- if (rectype >= DB_user_BEGIN && dbenv->tx_recover != NULL)
- return (dbenv->tx_recover(dbenv, db, lsnp, redo));
- else
- return (dbenv->dtab[rectype](dbenv, db, lsnp, redo, info));
- }
- return (0);
- }
- /*
- * __db_add_recovery --
- *
- * PUBLIC: int __db_add_recovery __P((DB_ENV *,
- * PUBLIC: int (*)(DB_ENV *, DBT *, DB_LSN *, db_recops, void *), u_int32_t));
- */
- int
- __db_add_recovery(dbenv, func, ndx)
- DB_ENV *dbenv;
- int (*func) __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- u_int32_t ndx;
- {
- u_int32_t i, nsize;
- int ret;
- /* Check if we have to grow the table. */
- if (ndx >= dbenv->dtab_size) {
- nsize = ndx + 40;
- if ((ret = __os_realloc(dbenv,
- nsize * sizeof(dbenv->dtab[0]), NULL, &dbenv->dtab)) != 0)
- return (ret);
- for (i = dbenv->dtab_size; i < nsize; ++i)
- dbenv->dtab[i] = NULL;
- dbenv->dtab_size = nsize;
- }
- dbenv->dtab[ndx] = func;
- return (0);
- }
- /*
- * __deprecated_recover --
- * Stub routine for deprecated recovery functions.
- *
- * PUBLIC: int __deprecated_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __deprecated_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- COMPQUIET(dbenv, NULL);
- COMPQUIET(dbtp, NULL);
- COMPQUIET(lsnp, NULL);
- COMPQUIET(op, 0);
- COMPQUIET(info, NULL);
- return (EINVAL);
- }
- /*
- * __db_txnlist_init --
- * Initialize transaction linked list.
- *
- * PUBLIC: int __db_txnlist_init __P((DB_ENV *, void *));
- */
- int
- __db_txnlist_init(dbenv, retp)
- DB_ENV *dbenv;
- void *retp;
- {
- DB_TXNHEAD *headp;
- int ret;
- if ((ret = __os_malloc(dbenv, sizeof(DB_TXNHEAD), NULL, &headp)) != 0)
- return (ret);
- LIST_INIT(&headp->head);
- headp->maxid = 0;
- headp->generation = 1;
- *(void **)retp = headp;
- return (0);
- }
- /*
- * __db_txnlist_add --
- * Add an element to our transaction linked list.
- *
- * PUBLIC: int __db_txnlist_add __P((DB_ENV *, void *, u_int32_t, int32_t));
- */
- int
- __db_txnlist_add(dbenv, listp, txnid, aborted)
- DB_ENV *dbenv;
- void *listp;
- u_int32_t txnid;
- int32_t aborted;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *elp;
- int ret;
- if ((ret = __os_malloc(dbenv, sizeof(DB_TXNLIST), NULL, &elp)) != 0)
- return (ret);
- hp = (DB_TXNHEAD *)listp;
- LIST_INSERT_HEAD(&hp->head, elp, links);
- elp->type = TXNLIST_TXNID;
- elp->u.t.txnid = txnid;
- elp->u.t.aborted = aborted;
- if (txnid > hp->maxid)
- hp->maxid = txnid;
- elp->u.t.generation = hp->generation;
- return (0);
- }
- /*
- * __db_txnlist_remove --
- * Remove an element from our transaction linked list.
- *
- * PUBLIC: int __db_txnlist_remove __P((void *, u_int32_t));
- */
- int
- __db_txnlist_remove(listp, txnid)
- void *listp;
- u_int32_t txnid;
- {
- DB_TXNLIST *entry;
- return (__db_txnlist_find_internal(listp,
- TXNLIST_TXNID, txnid, NULL, &entry, 1));
- }
- /* __db_txnlist_close --
- *
- * Call this when we close a file. It allows us to reconcile whether
- * we have done any operations on this file with whether the file appears
- * to have been deleted. If you never do any operations on a file, then
- * we assume it's OK to appear deleted.
- *
- * PUBLIC: int __db_txnlist_close __P((void *, int32_t, u_int32_t));
- */
- int
- __db_txnlist_close(listp, lid, count)
- void *listp;
- int32_t lid;
- u_int32_t count;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *p;
- hp = (DB_TXNHEAD *)listp;
- for (p = LIST_FIRST(&hp->head); p != NULL; p = LIST_NEXT(p, links)) {
- if (p->type == TXNLIST_DELETE)
- if (lid == p->u.d.fileid &&
- !F_ISSET(&p->u.d, TXNLIST_FLAG_CLOSED)) {
- p->u.d.count += count;
- return (0);
- }
- }
- return (0);
- }
- /*
- * __db_txnlist_delete --
- *
- * Record that a file was missing or deleted. If the deleted
- * flag is set, then we've encountered a delete of a file, else we've
- * just encountered a file that is missing. The lid is the log fileid
- * and is only meaningful if deleted is not equal to 0.
- *
- * PUBLIC: int __db_txnlist_delete __P((DB_ENV *,
- * PUBLIC: void *, char *, u_int32_t, int));
- */
- int
- __db_txnlist_delete(dbenv, listp, name, lid, deleted)
- DB_ENV *dbenv;
- void *listp;
- char *name;
- u_int32_t lid;
- int deleted;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *p;
- int ret;
- hp = (DB_TXNHEAD *)listp;
- for (p = LIST_FIRST(&hp->head); p != NULL; p = LIST_NEXT(p, links)) {
- if (p->type == TXNLIST_DELETE)
- if (strcmp(name, p->u.d.fname) == 0) {
- if (deleted)
- F_SET(&p->u.d, TXNLIST_FLAG_DELETED);
- else
- F_CLR(&p->u.d, TXNLIST_FLAG_CLOSED);
- return (0);
- }
- }
- /* Need to add it. */
- if ((ret = __os_malloc(dbenv, sizeof(DB_TXNLIST), NULL, &p)) != 0)
- return (ret);
- LIST_INSERT_HEAD(&hp->head, p, links);
- p->type = TXNLIST_DELETE;
- p->u.d.flags = 0;
- if (deleted)
- F_SET(&p->u.d, TXNLIST_FLAG_DELETED);
- p->u.d.fileid = lid;
- p->u.d.count = 0;
- ret = __os_strdup(dbenv, name, &p->u.d.fname);
- return (ret);
- }
- /*
- * __db_txnlist_end --
- * Discard transaction linked list. Print out any error messages
- * for deleted files.
- *
- * PUBLIC: void __db_txnlist_end __P((DB_ENV *, void *));
- */
- void
- __db_txnlist_end(dbenv, listp)
- DB_ENV *dbenv;
- void *listp;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *p;
- DB_LOG *lp;
- hp = (DB_TXNHEAD *)listp;
- lp = (DB_LOG *)dbenv->lg_handle;
- while (hp != NULL && (p = LIST_FIRST(&hp->head)) != NULL) {
- LIST_REMOVE(p, links);
- switch (p->type) {
- case TXNLIST_DELETE:
- /*
- * If we have a file that is not deleted and has
- * some operations, we flag the warning. Since
- * the file could still be open, we need to check
- * the actual log table as well.
- */
- if ((!F_ISSET(&p->u.d, TXNLIST_FLAG_DELETED) &&
- p->u.d.count != 0) ||
- (!F_ISSET(&p->u.d, TXNLIST_FLAG_CLOSED) &&
- p->u.d.fileid != (int32_t) TXNLIST_INVALID_ID &&
- p->u.d.fileid < lp->dbentry_cnt &&
- lp->dbentry[p->u.d.fileid].count != 0))
- __db_err(dbenv, "warning: %s: %s",
- p->u.d.fname, db_strerror(ENOENT));
- __os_freestr(p->u.d.fname);
- break;
- case TXNLIST_LSN:
- __os_free(p->u.l.lsn_array,
- p->u.l.maxn * sizeof(DB_LSN));
- break;
- default:
- /* Possibly an incomplete DB_TXNLIST; just free it. */
- break;
- }
- __os_free(p, sizeof(DB_TXNLIST));
- }
- __os_free(listp, sizeof(DB_TXNHEAD));
- }
- /*
- * __db_txnlist_find --
- * Checks to see if a txnid with the current generation is in the
- * txnid list. This returns DB_NOTFOUND if the item isn't in the
- * list otherwise it returns (like __db_txnlist_find_internal) a
- * 1 or 0 indicating if the transaction is aborted or not. A txnid
- * of 0 means the record was generated while not in a transaction.
- *
- * PUBLIC: int __db_txnlist_find __P((void *, u_int32_t));
- */
- int
- __db_txnlist_find(listp, txnid)
- void *listp;
- u_int32_t txnid;
- {
- DB_TXNLIST *entry;
- if (txnid == 0)
- return (DB_NOTFOUND);
- return (__db_txnlist_find_internal(listp,
- TXNLIST_TXNID, txnid, NULL, &entry, 0));
- }
- /*
- * __db_txnlist_find_internal --
- * Find an entry on the transaction list.
- * If the entry is not there or the list pointeris not initialized
- * we return DB_NOTFOUND. If the item is found, we return the aborted
- * status (1 for aborted, 0 for not aborted). Currently we always call
- * this with an initialized list pointer but checking for NULL keeps it general.
- */
- static int
- __db_txnlist_find_internal(listp, type, txnid, uid, txnlistp, delete)
- void *listp;
- db_txnlist_type type;
- u_int32_t txnid;
- u_int8_t uid[DB_FILE_ID_LEN];
- DB_TXNLIST **txnlistp;
- int delete;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *p;
- int ret;
- if ((hp = (DB_TXNHEAD *)listp) == NULL)
- return (DB_NOTFOUND);
- for (p = LIST_FIRST(&hp->head); p != NULL; p = LIST_NEXT(p, links)) {
- if (p->type != type)
- continue;
- switch (type) {
- case TXNLIST_TXNID:
- if (p->u.t.txnid != txnid ||
- hp->generation != p->u.t.generation)
- continue;
- ret = p->u.t.aborted;
- break;
- case TXNLIST_PGNO:
- if (memcmp(uid, p->u.p.uid, DB_FILE_ID_LEN) != 0)
- continue;
- ret = 0;
- break;
- default:
- DB_ASSERT(0);
- ret = EINVAL;
- }
- if (delete == 1) {
- LIST_REMOVE(p, links);
- __os_free(p, sizeof(DB_TXNLIST));
- } else if (p != LIST_FIRST(&hp->head)) {
- /* Move it to head of list. */
- LIST_REMOVE(p, links);
- LIST_INSERT_HEAD(&hp->head, p, links);
- }
- *txnlistp = p;
- return (ret);
- }
- return (DB_NOTFOUND);
- }
- /*
- * __db_txnlist_gen --
- * Change the current generation number.
- *
- * PUBLIC: void __db_txnlist_gen __P((void *, int));
- */
- void
- __db_txnlist_gen(listp, incr)
- void *listp;
- int incr;
- {
- DB_TXNHEAD *hp;
- /*
- * During recovery generation numbers keep track of how many "restart"
- * checkpoints we've seen. Restart checkpoints occur whenever we take
- * a checkpoint and there are no outstanding transactions. When that
- * happens, we can reset transaction IDs back to 1. It always happens
- * at recovery and it prevents us from exhausting the transaction IDs
- * name space.
- */
- hp = (DB_TXNHEAD *)listp;
- hp->generation += incr;
- }
- #define TXN_BUBBLE(AP, MAX) {
- int __j;
- DB_LSN __tmp;
-
- for (__j = 0; __j < MAX - 1; __j++)
- if (log_compare(&AP[__j], &AP[__j + 1]) < 0) {
- __tmp = AP[__j];
- AP[__j] = AP[__j + 1];
- AP[__j + 1] = __tmp;
- }
- }
- /*
- * __db_txnlist_lsnadd --
- * Add to or re-sort the transaction list lsn entry.
- * Note that since this is used during an abort, the __txn_undo
- * code calls into the "recovery" subsystem explicitly, and there
- * is only a single TXNLIST_LSN entry on the list.
- *
- * PUBLIC: int __db_txnlist_lsnadd __P((DB_ENV *, void *, DB_LSN *, u_int32_t));
- */
- int
- __db_txnlist_lsnadd(dbenv, listp, lsnp, flags)
- DB_ENV *dbenv;
- void *listp;
- DB_LSN *lsnp;
- u_int32_t flags;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *elp;
- int i, ret;
- hp = (DB_TXNHEAD *)listp;
- for (elp = LIST_FIRST(&hp->head);
- elp != NULL; elp = LIST_NEXT(elp, links))
- if (elp->type == TXNLIST_LSN)
- break;
- if (elp == NULL)
- return (EINVAL);
- if (LF_ISSET(TXNLIST_NEW)) {
- if (elp->u.l.ntxns >= elp->u.l.maxn) {
- if ((ret = __os_realloc(dbenv,
- 2 * elp->u.l.maxn * sizeof(DB_LSN),
- NULL, &elp->u.l.lsn_array)) != 0)
- return (ret);
- elp->u.l.maxn *= 2;
- }
- elp->u.l.lsn_array[elp->u.l.ntxns++] = *lsnp;
- } else
- /* Simply replace the 0th element. */
- elp->u.l.lsn_array[0] = *lsnp;
- /*
- * If we just added a new entry and there may be NULL
- * entries, so we have to do a complete bubble sort,
- * not just trickle a changed entry around.
- */
- for (i = 0; i < (!LF_ISSET(TXNLIST_NEW) ? 1 : elp->u.l.ntxns); i++)
- TXN_BUBBLE(elp->u.l.lsn_array, elp->u.l.ntxns);
- *lsnp = elp->u.l.lsn_array[0];
- return (0);
- }
- /*
- * __db_txnlist_lsnhead --
- * Return a pointer to the beginning of the lsn_array.
- *
- * PUBLIC: int __db_txnlist_lsnhead __P((void *, DB_LSN **));
- */
- int
- __db_txnlist_lsnhead(listp, lsnpp)
- void *listp;
- DB_LSN **lsnpp;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *elp;
- hp = (DB_TXNHEAD *)listp;
- for (elp = LIST_FIRST(&hp->head);
- elp != NULL; elp = LIST_NEXT(elp, links))
- if (elp->type == TXNLIST_LSN)
- break;
- if (elp == NULL)
- return (EINVAL);
- *lsnpp = &elp->u.l.lsn_array[0];
- return (0);
- }
- /*
- * __db_txnlist_lsninit --
- * Initialize a transaction list with an lsn array entry.
- *
- * PUBLIC: int __db_txnlist_lsninit __P((DB_ENV *, DB_TXNHEAD *, DB_LSN *));
- */
- int
- __db_txnlist_lsninit(dbenv, hp, lsnp)
- DB_ENV *dbenv;
- DB_TXNHEAD *hp;
- DB_LSN *lsnp;
- {
- DB_TXNLIST *elp;
- int ret;
- elp = NULL;
- if ((ret = __os_malloc(dbenv, sizeof(DB_TXNLIST), NULL, &elp)) != 0)
- goto err;
- LIST_INSERT_HEAD(&hp->head, elp, links);
- if ((ret = __os_malloc(dbenv,
- 12 * sizeof(DB_LSN), NULL, &elp->u.l.lsn_array)) != 0)
- goto err;
- elp->type = TXNLIST_LSN;
- elp->u.l.maxn = 12;
- elp->u.l.ntxns = 1;
- elp->u.l.lsn_array[0] = *lsnp;
- return (0);
- err: __db_txnlist_end(dbenv, hp);
- return (ret);
- }
- /*
- * __db_add_limbo -- add pages to the limbo list.
- * Get the file information and call pgnoadd
- * for each page.
- *
- * PUBLIC: int __db_add_limbo __P((DB_ENV *,
- * PUBLIC: void *, int32_t, db_pgno_t, int32_t));
- */
- int
- __db_add_limbo(dbenv, info, fileid, pgno, count)
- DB_ENV *dbenv;
- void *info;
- int32_t fileid;
- db_pgno_t pgno;
- int32_t count;
- {
- DB_LOG *dblp;
- FNAME *fnp;
- int ret;
- dblp = dbenv->lg_handle;
- if ((ret = __log_lid_to_fname(dblp, fileid, &fnp)) != 0)
- return (ret);
- do {
- if ((ret =
- __db_txnlist_pgnoadd(dbenv, info, fileid, fnp->ufid,
- R_ADDR(&dblp->reginfo, fnp->name_off), pgno)) != 0)
- return (ret);
- pgno++;
- } while (--count != 0);
- return (0);
- }
- /*
- * __db_do_the_limbo -- move pages from limbo to free.
- *
- * If we are in recovery we add things to the free list without
- * logging becasue we want to incrementaly apply logs that
- * may be generated on another copy of this environment.
- * Otherwise we just call __db_free to put the pages on
- * the free list and log the activity.
- *
- * PUBLIC: int __db_do_the_limbo __P((DB_ENV *, DB_TXNHEAD *));
- */
- int
- __db_do_the_limbo(dbenv, hp)
- DB_ENV *dbenv;
- DB_TXNHEAD *hp;
- {
- DB *dbp;
- DBC *dbc;
- DBMETA *meta;
- DB_TXN *txn;
- DB_TXNLIST *elp;
- PAGE *pagep;
- db_pgno_t last_pgno, pgno;
- int i, in_recover, put_page, ret, t_ret;
- dbp = NULL;
- dbc = NULL;
- txn = NULL;
- ret = 0;
- /* Are we in recovery? */
- in_recover = F_ISSET((DB_LOG *)dbenv->lg_handle, DBLOG_RECOVER);
- for (elp = LIST_FIRST(&hp->head);
- elp != NULL; elp = LIST_NEXT(elp, links)) {
- if (elp->type != TXNLIST_PGNO)
- continue;
- if (in_recover) {
- if ((ret = db_create(&dbp, dbenv, 0)) != 0)
- goto err;
- /*
- * It is ok if the file is nolonger there.
- */
- dbp->type = DB_UNKNOWN;
- ret = __db_dbopen(dbp,
- elp->u.p.fname, 0, __db_omode("rw----"), 0);
- } else {
- /*
- * If we are in transaction undo, then we know
- * the fileid is still correct.
- */
- if ((ret =
- __db_fileid_to_db(dbenv, &dbp,
- elp->u.p.fileid, 0)) != 0 && ret != DB_DELETED)
- goto err;
- /* File is being destroyed. */
- if (F_ISSET(dbp, DB_AM_DISCARD))
- ret = DB_DELETED;
- }
- /*
- * Verify that we are opening the same file that we were
- * referring to when we wrote this log record.
- */
- if (ret == 0 &&
- memcmp(elp->u.p.uid, dbp->fileid, DB_FILE_ID_LEN) == 0) {
- last_pgno = PGNO_INVALID;
- if (in_recover) {
- pgno = PGNO_BASE_MD;
- if ((ret = memp_fget(dbp->mpf,
- &pgno, 0, (PAGE **)&meta)) != 0)
- goto err;
- last_pgno = meta->free;
- /*
- * Check to see if the head of the free
- * list is any of the pages we are about
- * to link in. We could have crashed
- * after linking them in and before writing
- * a checkpoint.
- * It may not be the last one since
- * any page may get reallocated before here.
- */
- if (last_pgno != PGNO_INVALID)
- for (i = 0; i < elp->u.p.nentries; i++)
- if (last_pgno
- == elp->u.p.pgno_array[i])
- goto done_it;
- }
- for (i = 0; i < elp->u.p.nentries; i++) {
- pgno = elp->u.p.pgno_array[i];
- if ((ret = memp_fget(dbp->mpf,
- &pgno, DB_MPOOL_CREATE, &pagep)) != 0)
- goto err;
- put_page = 1;
- if (IS_ZERO_LSN(LSN(pagep))) {
- P_INIT(pagep, dbp->pgsize,
- pgno, PGNO_INVALID,
- last_pgno, 0, P_INVALID);
- if (in_recover) {
- LSN(pagep) = LSN(meta);
- last_pgno = pgno;
- } else {
- /*
- * Starting the transaction
- * is postponed until we know
- * we have something to do.
- */
- if (txn == NULL &&
- (ret = txn_begin(dbenv,
- NULL, &txn, 0)) != 0)
- goto err;
- if (dbc == NULL &&
- (ret = dbp->cursor(dbp,
- txn, &dbc, 0)) != 0)
- goto err;
- /* Turn off locking. */
- F_SET(dbc, DBC_COMPENSATE);
- /* __db_free puts the page. */
- if ((ret =
- __db_free(dbc, pagep)) != 0)
- goto err;
- put_page = 0;
- }
- }
- if (put_page == 1 &&
- (ret = memp_fput(dbp->mpf,
- pagep, DB_MPOOL_DIRTY)) != 0)
- goto err;
- }
- if (in_recover) {
- if (last_pgno == meta->free) {
- done_it:
- if ((ret =
- memp_fput(dbp->mpf, meta, 0)) != 0)
- goto err;
- } else {
- /*
- * Flush the new free list then
- * update the metapage. This is
- * unlogged so we cannot have the
- * metapage pointing at pages that
- * are not on disk.
- */
- dbp->sync(dbp, 0);
- meta->free = last_pgno;
- if ((ret = memp_fput(dbp->mpf,
- meta, DB_MPOOL_DIRTY)) != 0)
- goto err;
- }
- }
- if (dbc != NULL && (ret = dbc->c_close(dbc)) != 0)
- goto err;
- dbc = NULL;
- }
- if (in_recover && (t_ret = dbp->close(dbp, 0)) != 0 && ret == 0)
- ret = t_ret;
- dbp = NULL;
- __os_free(elp->u.p.fname, 0);
- __os_free(elp->u.p.pgno_array, 0);
- if (ret == ENOENT)
- ret = 0;
- else if (ret != 0)
- goto err;
- }
- if (txn != NULL) {
- ret = txn_commit(txn, 0);
- txn = NULL;
- }
- err:
- if (dbc != NULL)
- (void)dbc->c_close(dbc);
- if (in_recover && dbp != NULL)
- (void)dbp->close(dbp, 0);
- if (txn != NULL)
- (void)txn_abort(txn);
- return (ret);
- }
- #define DB_TXNLIST_MAX_PGNO 8 /* A nice even number. */
- /*
- * __db_txnlist_pgnoadd --
- * Find the txnlist entry for a file and add this pgno,
- * or add the list entry for the file and then add the pgno.
- *
- * PUBLIC: int __db_txnlist_pgnoadd __P((DB_ENV *, DB_TXNHEAD *,
- * PUBLIC: int32_t, u_int8_t [DB_FILE_ID_LEN], char *, db_pgno_t));
- */
- int
- __db_txnlist_pgnoadd(dbenv, hp, fileid, uid, fname, pgno)
- DB_ENV *dbenv;
- DB_TXNHEAD *hp;
- int32_t fileid;
- u_int8_t uid[DB_FILE_ID_LEN];
- char *fname;
- db_pgno_t pgno;
- {
- DB_TXNLIST *elp;
- int len, ret;
- elp = NULL;
- if (__db_txnlist_find_internal(hp, TXNLIST_PGNO, 0, uid, &elp, 0) != 0) {
- if ((ret =
- __os_malloc(dbenv, sizeof(DB_TXNLIST), NULL, &elp)) != 0)
- goto err;
- LIST_INSERT_HEAD(&hp->head, elp, links);
- elp->u.p.fileid = fileid;
- memcpy(elp->u.p.uid, uid, DB_FILE_ID_LEN);
- len = strlen(fname) + 1;
- if ((ret = __os_malloc(dbenv, len, NULL, &elp->u.p.fname)) != 0)
- goto err;
- memcpy(elp->u.p.fname, fname, len);
- elp->u.p.maxentry = 0;
- elp->type = TXNLIST_PGNO;
- if ((ret = __os_malloc(dbenv,
- 8 * sizeof(db_pgno_t), NULL, &elp->u.p.pgno_array)) != 0)
- goto err;
- elp->u.p.maxentry = DB_TXNLIST_MAX_PGNO;
- elp->u.p.nentries = 0;
- } else if (elp->u.p.nentries == elp->u.p.maxentry) {
- elp->u.p.maxentry <<= 1;
- if ((ret = __os_realloc(dbenv, elp->u.p.maxentry *
- sizeof(db_pgno_t), NULL, &elp->u.p.pgno_array)) != 0)
- goto err;
- }
- elp->u.p.pgno_array[elp->u.p.nentries++] = pgno;
- return (0);
- err: __db_txnlist_end(dbenv, hp);
- return (ret);
- }
- #ifdef DEBUG
- /*
- * __db_txnlist_print --
- * Print out the transaction list.
- *
- * PUBLIC: void __db_txnlist_print __P((void *));
- */
- void
- __db_txnlist_print(listp)
- void *listp;
- {
- DB_TXNHEAD *hp;
- DB_TXNLIST *p;
- hp = (DB_TXNHEAD *)listp;
- printf("Maxid: %lu Generation: %lun",
- (u_long)hp->maxid, (u_long)hp->generation);
- for (p = LIST_FIRST(&hp->head); p != NULL; p = LIST_NEXT(p, links)) {
- switch (p->type) {
- case TXNLIST_TXNID:
- printf("TXNID: %lu(%lu)n",
- (u_long)p->u.t.txnid, (u_long)p->u.t.generation);
- break;
- case TXNLIST_DELETE:
- printf("FILE: %s id=%d ops=%d %s %sn",
- p->u.d.fname, p->u.d.fileid, p->u.d.count,
- F_ISSET(&p->u.d, TXNLIST_FLAG_DELETED) ?
- "(deleted)" : "(missing)",
- F_ISSET(&p->u.d, TXNLIST_FLAG_CLOSED) ?
- "(closed)" : "(open)");
- break;
- default:
- printf("Unrecognized type: %dn", p->type);
- break;
- }
- }
- }
- #endif