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db_rec.c
Package: mysql-3.23.35.tar.gz [view]
Upload User: tsgydb
Upload Date: 2007-04-14
Package Size: 10674k
Code Size: 13k
Category:
MySQL
Development Platform:
Visual C++
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: db_rec.c,v 11.10 2000/08/03 15:32:19 ubell Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "db_page.h"
- #include "log.h"
- #include "hash.h"
- /*
- * PUBLIC: int __db_addrem_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- *
- * This log message is generated whenever we add or remove a duplicate
- * to/from a duplicate page. On recover, we just do the opposite.
- */
- int
- __db_addrem_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_addrem_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- u_int32_t change;
- int cmp_n, cmp_p, ret;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_addrem_print);
- REC_INTRO(__db_addrem_read, 1);
- if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op)) {
- /*
- * We are undoing and the page doesn't exist. That
- * is equivalent to having a pagelsn of 0, so we
- * would not have to undo anything. In this case,
- * don't bother creating a page.
- */
- goto done;
- } else
- if ((ret = memp_fget(mpf,
- &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
- goto out;
- }
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
- change = 0;
- if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_DUP) ||
- (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_DUP)) {
- /* Need to redo an add, or undo a delete. */
- if ((ret = __db_pitem(dbc, pagep, argp->indx, argp->nbytes,
- argp->hdr.size == 0 ? NULL : &argp->hdr,
- argp->dbt.size == 0 ? NULL : &argp->dbt)) != 0)
- goto out;
- change = DB_MPOOL_DIRTY;
- } else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_DUP) ||
- (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_DUP)) {
- /* Need to undo an add, or redo a delete. */
- if ((ret = __db_ditem(dbc,
- pagep, argp->indx, argp->nbytes)) != 0)
- goto out;
- change = DB_MPOOL_DIRTY;
- }
- if (change) {
- if (DB_REDO(op))
- LSN(pagep) = *lsnp;
- else
- LSN(pagep) = argp->pagelsn;
- }
- if ((ret = memp_fput(mpf, pagep, change)) != 0)
- goto out;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: REC_CLOSE;
- }
- /*
- * PUBLIC: int __db_big_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_big_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_big_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- u_int32_t change;
- int cmp_n, cmp_p, ret;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_big_print);
- REC_INTRO(__db_big_read, 1);
- if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op)) {
- /*
- * We are undoing and the page doesn't exist. That
- * is equivalent to having a pagelsn of 0, so we
- * would not have to undo anything. In this case,
- * don't bother creating a page.
- */
- ret = 0;
- goto ppage;
- } else
- if ((ret = memp_fget(mpf,
- &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
- goto out;
- }
- /*
- * There are three pages we need to check. The one on which we are
- * adding data, the previous one whose next_pointer may have
- * been updated, and the next one whose prev_pointer may have
- * been updated.
- */
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), &argp->pagelsn);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->pagelsn);
- change = 0;
- if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) ||
- (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_BIG)) {
- /* We are either redo-ing an add, or undoing a delete. */
- P_INIT(pagep, file_dbp->pgsize, argp->pgno, argp->prev_pgno,
- argp->next_pgno, 0, P_OVERFLOW);
- OV_LEN(pagep) = argp->dbt.size;
- OV_REF(pagep) = 1;
- memcpy((u_int8_t *)pagep + P_OVERHEAD, argp->dbt.data,
- argp->dbt.size);
- PREV_PGNO(pagep) = argp->prev_pgno;
- change = DB_MPOOL_DIRTY;
- } else if ((cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_ADD_BIG) ||
- (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_BIG)) {
- /*
- * We are either undo-ing an add or redo-ing a delete.
- * The page is about to be reclaimed in either case, so
- * there really isn't anything to do here.
- */
- change = DB_MPOOL_DIRTY;
- }
- if (change)
- LSN(pagep) = DB_REDO(op) ? *lsnp : argp->pagelsn;
- if ((ret = memp_fput(mpf, pagep, change)) != 0)
- goto out;
- /* Now check the previous page. */
- ppage: if (argp->prev_pgno != PGNO_INVALID) {
- change = 0;
- if ((ret = memp_fget(mpf, &argp->prev_pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op)) {
- /*
- * We are undoing and the page doesn't exist.
- * That is equivalent to having a pagelsn of 0,
- * so we would not have to undo anything. In
- * this case, don't bother creating a page.
- */
- *lsnp = argp->prev_lsn;
- ret = 0;
- goto npage;
- } else
- if ((ret = memp_fget(mpf, &argp->prev_pgno,
- DB_MPOOL_CREATE, &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);
- if ((cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_ADD_BIG) ||
- (cmp_n == 0 && DB_UNDO(op) && argp->opcode == DB_REM_BIG)) {
- /* Redo add, undo delete. */
- NEXT_PGNO(pagep) = argp->pgno;
- change = DB_MPOOL_DIRTY;
- } else if ((cmp_n == 0 &&
- DB_UNDO(op) && argp->opcode == DB_ADD_BIG) ||
- (cmp_p == 0 && DB_REDO(op) && argp->opcode == DB_REM_BIG)) {
- /* Redo delete, undo add. */
- NEXT_PGNO(pagep) = argp->next_pgno;
- change = DB_MPOOL_DIRTY;
- }
- if (change)
- LSN(pagep) = DB_REDO(op) ? *lsnp : argp->prevlsn;
- if ((ret = memp_fput(mpf, pagep, change)) != 0)
- goto out;
- }
- /* Now check the next page. Can only be set on a delete. */
- npage: if (argp->next_pgno != PGNO_INVALID) {
- change = 0;
- if ((ret = memp_fget(mpf, &argp->next_pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op)) {
- /*
- * We are undoing and the page doesn't exist.
- * That is equivalent to having a pagelsn of 0,
- * so we would not have to undo anything. In
- * this case, don't bother creating a page.
- */
- goto done;
- } else
- if ((ret = memp_fget(mpf, &argp->next_pgno,
- DB_MPOOL_CREATE, &pagep)) != 0)
- goto out;
- }
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), &argp->nextlsn);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->nextlsn);
- if (cmp_p == 0 && DB_REDO(op)) {
- PREV_PGNO(pagep) = PGNO_INVALID;
- change = DB_MPOOL_DIRTY;
- } else if (cmp_n == 0 && DB_UNDO(op)) {
- PREV_PGNO(pagep) = argp->pgno;
- change = DB_MPOOL_DIRTY;
- }
- if (change)
- LSN(pagep) = DB_REDO(op) ? *lsnp : argp->nextlsn;
- if ((ret = memp_fput(mpf, pagep, change)) != 0)
- goto out;
- }
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: REC_CLOSE;
- }
- /*
- * __db_ovref_recover --
- * Recovery function for __db_ovref().
- *
- * PUBLIC: int __db_ovref_recover __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_ovref_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_ovref_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- int cmp, modified, ret;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_ovref_print);
- REC_INTRO(__db_ovref_read, 1);
- if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op))
- goto done;
- (void)__db_pgerr(file_dbp, argp->pgno);
- goto out;
- }
- modified = 0;
- cmp = log_compare(&LSN(pagep), &argp->lsn);
- CHECK_LSN(op, cmp, &LSN(pagep), &argp->lsn);
- if (cmp == 0 && DB_REDO(op)) {
- /* Need to redo update described. */
- OV_REF(pagep) += argp->adjust;
- pagep->lsn = *lsnp;
- modified = 1;
- } else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
- /* Need to undo update described. */
- OV_REF(pagep) -= argp->adjust;
- pagep->lsn = argp->lsn;
- modified = 1;
- }
- if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: REC_CLOSE;
- }
- /*
- * __db_relink_recover --
- * Recovery function for relink.
- *
- * PUBLIC: int __db_relink_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_relink_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_relink_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- int cmp_n, cmp_p, modified, ret;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_relink_print);
- REC_INTRO(__db_relink_read, 1);
- /*
- * There are up to three pages we need to check -- the page, and the
- * previous and next pages, if they existed. For a page add operation,
- * the current page is the result of a split and is being recovered
- * elsewhere, so all we need do is recover the next page.
- */
- if ((ret = memp_fget(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- (void)__db_pgerr(file_dbp, argp->pgno);
- goto out;
- }
- goto next2;
- }
- modified = 0;
- if (argp->opcode == DB_ADD_PAGE)
- goto next1;
- cmp_p = log_compare(&LSN(pagep), &argp->lsn);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn);
- if (cmp_p == 0 && DB_REDO(op)) {
- /* Redo the relink. */
- pagep->lsn = *lsnp;
- modified = 1;
- } else if (log_compare(lsnp, &LSN(pagep)) == 0 && DB_UNDO(op)) {
- /* Undo the relink. */
- pagep->next_pgno = argp->next;
- pagep->prev_pgno = argp->prev;
- pagep->lsn = argp->lsn;
- modified = 1;
- }
- next1: if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- next2: if ((ret = memp_fget(mpf, &argp->next, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- (void)__db_pgerr(file_dbp, argp->next);
- goto out;
- }
- goto prev;
- }
- modified = 0;
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), &argp->lsn_next);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_next);
- if ((argp->opcode == DB_REM_PAGE && cmp_p == 0 && DB_REDO(op)) ||
- (argp->opcode == DB_ADD_PAGE && cmp_n == 0 && DB_UNDO(op))) {
- /* Redo the remove or undo the add. */
- pagep->prev_pgno = argp->prev;
- modified = 1;
- } else if ((argp->opcode == DB_REM_PAGE && cmp_n == 0 && DB_UNDO(op)) ||
- (argp->opcode == DB_ADD_PAGE && cmp_p == 0 && DB_REDO(op))) {
- /* Undo the remove or redo the add. */
- pagep->prev_pgno = argp->pgno;
- modified = 1;
- }
- if (modified == 1) {
- if (DB_UNDO(op))
- pagep->lsn = argp->lsn_next;
- else
- pagep->lsn = *lsnp;
- }
- if ((ret = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- if (argp->opcode == DB_ADD_PAGE)
- goto done;
- prev: if ((ret = memp_fget(mpf, &argp->prev, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- (void)__db_pgerr(file_dbp, argp->prev);
- goto out;
- }
- goto done;
- }
- modified = 0;
- cmp_p = log_compare(&LSN(pagep), &argp->lsn_prev);
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->lsn_prev);
- 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 = memp_fput(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: 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(op, 0);
- COMPQUIET(dbenv, NULL);
- 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;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_noop_print);
- REC_INTRO(__db_noop_read, 0);
- if ((ret = memp_fget(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 = memp_fput(mpf, pagep, change);
- done: *lsnp = argp->prev_lsn;
- out: REC_CLOSE;
- }