db_rec.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:22k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: db_rec.c,v 11.35 2002/08/08 03:57:49 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/log.h"
- #include "dbinc/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;
- pagep = NULL;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_addrem_print);
- REC_INTRO(__db_addrem_read, 1);
- if ((ret = mpf->get(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 = mpf->get(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 = mpf->put(mpf, pagep, change)) != 0)
- goto out;
- pagep = NULL;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- 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;
- pagep = NULL;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_big_print);
- REC_INTRO(__db_big_read, 1);
- if ((ret = mpf->get(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 = mpf->get(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(file_dbp), 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 = mpf->put(mpf, pagep, change)) != 0)
- goto out;
- pagep = NULL;
- /*
- * We only delete a whole chain of overflow.
- * Each page is handled individually
- */
- if (argp->opcode == DB_REM_BIG)
- goto done;
- /* Now check the previous page. */
- ppage: if (argp->prev_pgno != PGNO_INVALID) {
- change = 0;
- if ((ret = mpf->get(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 = mpf->get(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) {
- /* 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) {
- /* 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 = mpf->put(mpf, pagep, change)) != 0)
- goto out;
- }
- pagep = NULL;
- /* Now check the next page. Can only be set on a delete. */
- npage: if (argp->next_pgno != PGNO_INVALID) {
- change = 0;
- if ((ret = mpf->get(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 = mpf->get(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 = mpf->put(mpf, pagep, change)) != 0)
- goto out;
- }
- pagep = NULL;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- REC_CLOSE;
- }
- /*
- * __db_ovref_recover --
- * Recovery function for __db_ovref().
- *
- * PUBLIC: int __db_ovref_recover
- * PUBLIC: __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;
- pagep = NULL;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_ovref_print);
- REC_INTRO(__db_ovref_read, 1);
- if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_UNDO(op))
- goto done;
- __db_pgerr(file_dbp, argp->pgno, ret);
- 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 = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- 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;
- pagep = NULL;
- 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 = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- __db_pgerr(file_dbp, argp->pgno, ret);
- 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 = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- next2: if ((ret = mpf->get(mpf, &argp->next, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- __db_pgerr(file_dbp, argp->next, ret);
- 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 = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- if (argp->opcode == DB_ADD_PAGE)
- goto done;
- prev: if ((ret = mpf->get(mpf, &argp->prev, 0, &pagep)) != 0) {
- if (DB_REDO(op)) {
- __db_pgerr(file_dbp, argp->prev, ret);
- 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 = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- 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(dbenv, NULL);
- COMPQUIET(op, DB_TXN_ABORT);
- 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;
- pagep = NULL;
- COMPQUIET(info, NULL);
- REC_PRINT(__db_noop_print);
- REC_INTRO(__db_noop_read, 0);
- if ((ret = mpf->get(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 = mpf->put(mpf, pagep, change);
- pagep = NULL;
- done: *lsnp = argp->prev_lsn;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- REC_CLOSE;
- }
- /*
- * __db_pg_alloc_recover --
- * Recovery function for pg_alloc.
- *
- * PUBLIC: int __db_pg_alloc_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_pg_alloc_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_pg_alloc_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DBMETA *meta;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- db_pgno_t pgno;
- int cmp_n, cmp_p, created, level, modified, ret;
- meta = NULL;
- pagep = NULL;
- REC_PRINT(__db_pg_alloc_print);
- REC_INTRO(__db_pg_alloc_read, 0);
- /*
- * Fix up the allocated page. If we're redoing the operation, we have
- * to get the page (creating it if it doesn't exist), and update its
- * LSN. If we're undoing the operation, we have to reset the page's
- * LSN and put it on the free list.
- *
- * Fix up the metadata page. If we're redoing the operation, we have
- * to get the metadata page and update its LSN and its free pointer.
- * If we're undoing the operation and the page was ever created, we put
- * it on the freelist.
- */
- pgno = PGNO_BASE_MD;
- if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
- /* The metadata page must always exist on redo. */
- if (DB_REDO(op)) {
- __db_pgerr(file_dbp, pgno, ret);
- goto out;
- } else
- goto done;
- }
- created = modified = 0;
- if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) {
- /*
- * We have to be able to identify if a page was newly
- * created so we can recover it properly. We cannot simply
- * look for an empty header, because hash uses a pgin
- * function that will set the header. Instead, we explicitly
- * try for the page without CREATE and if that fails, then
- * create it.
- */
- if ((ret =
- mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) {
- __db_pgerr(file_dbp, argp->pgno, ret);
- goto out;
- }
- created = modified = 1;
- }
- /* Fix up the allocated page. */
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), &argp->page_lsn);
- /*
- * If an inital allocation is aborted and then reallocated
- * during an archival restore the log record will have
- * an LSN for the page but the page will be empty.
- */
- if (IS_ZERO_LSN(LSN(pagep)))
- cmp_p = 0;
- CHECK_LSN(op, cmp_p, &LSN(pagep), &argp->page_lsn);
- /*
- * If we we rolled back this allocation previously during an
- * archive restore, the page may have the LSN of the meta page
- * at the point of the roll back. This will be no more
- * than the LSN of the metadata page at the time of this allocation.
- * Another special case we have to handle is if we ended up with a
- * page of all 0's which can happen if we abort between allocating a
- * page in mpool and initializing it. In that case, even if we're
- * undoing, we need to re-initialize the page.
- */
- if (DB_REDO(op) &&
- (cmp_p == 0 ||
- (IS_ZERO_LSN(argp->page_lsn) &&
- log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
- /* Need to redo update described. */
- switch (argp->ptype) {
- case P_LBTREE:
- case P_LRECNO:
- case P_LDUP:
- level = LEAFLEVEL;
- break;
- default:
- level = 0;
- break;
- }
- P_INIT(pagep, file_dbp->pgsize,
- argp->pgno, PGNO_INVALID, PGNO_INVALID, level, argp->ptype);
- pagep->lsn = *lsnp;
- modified = 1;
- } else if (DB_UNDO(op) && (cmp_n == 0 || created)) {
- /*
- * This is where we handle the case of a 0'd page (pagep->pgno
- * is equal to PGNO_INVALID).
- * Undo the allocation, reinitialize the page and
- * link its next pointer to the free list.
- */
- P_INIT(pagep, file_dbp->pgsize,
- argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
- pagep->lsn = argp->page_lsn;
- modified = 1;
- }
- /*
- * If the page was newly created, put it on the limbo list.
- */
- if (IS_ZERO_LSN(LSN(pagep)) &&
- IS_ZERO_LSN(argp->page_lsn) && DB_UNDO(op)) {
- /* Put the page in limbo.*/
- if ((ret = __db_add_limbo(dbenv,
- info, argp->fileid, argp->pgno, 1)) != 0)
- goto out;
- }
- if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- /* Fix up the metadata page. */
- modified = 0;
- cmp_n = log_compare(lsnp, &LSN(meta));
- cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
- CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
- if (cmp_p == 0 && DB_REDO(op)) {
- /* Need to redo update described. */
- LSN(meta) = *lsnp;
- meta->free = argp->next;
- modified = 1;
- } else if (cmp_n == 0 && DB_UNDO(op)) {
- /* Need to undo update described. */
- LSN(meta) = argp->meta_lsn;
- /*
- * If the page has a zero LSN then its newly created
- * and will go into limbo rather than directly on the
- * free list.
- */
- if (!IS_ZERO_LSN(argp->page_lsn))
- meta->free = argp->pgno;
- modified = 1;
- }
- if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- meta = NULL;
- /*
- * This could be the metapage from a subdb which is read from disk
- * to recover its creation.
- */
- if (F_ISSET(file_dbp, DB_AM_SUBDB))
- switch (argp->type) {
- case P_BTREEMETA:
- case P_HASHMETA:
- case P_QAMMETA:
- file_dbp->sync(file_dbp, 0);
- break;
- }
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- if (meta != NULL)
- (void)mpf->put(mpf, meta, 0);
- if (ret == ENOENT && op == DB_TXN_BACKWARD_ALLOC)
- ret = 0;
- REC_CLOSE;
- }
- /*
- * __db_pg_free_recover --
- * Recovery function for pg_free.
- *
- * PUBLIC: int __db_pg_free_recover
- * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_pg_free_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_pg_free_args *argp;
- DB *file_dbp;
- DBC *dbc;
- DBMETA *meta;
- DB_LSN copy_lsn;
- DB_MPOOLFILE *mpf;
- PAGE *pagep;
- db_pgno_t pgno;
- int cmp_n, cmp_p, modified, ret;
- COMPQUIET(info, NULL);
- meta = NULL;
- pagep = NULL;
- REC_PRINT(__db_pg_free_print);
- REC_INTRO(__db_pg_free_read, 1);
- /*
- * Fix up the freed page. If we're redoing the operation we get the
- * page and explicitly discard its contents, then update its LSN. If
- * we're undoing the operation, we get the page and restore its header.
- * Create the page if necessary, we may be freeing an aborted
- * create.
- */
- if ((ret = mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
- goto out;
- modified = 0;
- (void)__ua_memcpy(©_lsn, &LSN(argp->header.data), sizeof(DB_LSN));
- cmp_n = log_compare(lsnp, &LSN(pagep));
- cmp_p = log_compare(&LSN(pagep), ©_lsn);
- CHECK_LSN(op, cmp_p, &LSN(pagep), ©_lsn);
- if (DB_REDO(op) &&
- (cmp_p == 0 ||
- (IS_ZERO_LSN(copy_lsn) &&
- log_compare(&LSN(pagep), &argp->meta_lsn) <= 0))) {
- /* Need to redo update described. */
- P_INIT(pagep, file_dbp->pgsize,
- argp->pgno, PGNO_INVALID, argp->next, 0, P_INVALID);
- pagep->lsn = *lsnp;
- modified = 1;
- } else if (cmp_n == 0 && DB_UNDO(op)) {
- /* Need to undo update described. */
- memcpy(pagep, argp->header.data, argp->header.size);
- modified = 1;
- }
- if ((ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- pagep = NULL;
- /*
- * Fix up the metadata page. If we're redoing or undoing the operation
- * we get the page and update its LSN and free pointer.
- */
- pgno = PGNO_BASE_MD;
- if ((ret = mpf->get(mpf, &pgno, 0, &meta)) != 0) {
- /* The metadata page must always exist. */
- __db_pgerr(file_dbp, pgno, ret);
- goto out;
- }
- modified = 0;
- cmp_n = log_compare(lsnp, &LSN(meta));
- cmp_p = log_compare(&LSN(meta), &argp->meta_lsn);
- CHECK_LSN(op, cmp_p, &LSN(meta), &argp->meta_lsn);
- if (cmp_p == 0 && DB_REDO(op)) {
- /* Need to redo the deallocation. */
- meta->free = argp->pgno;
- LSN(meta) = *lsnp;
- modified = 1;
- } else if (cmp_n == 0 && DB_UNDO(op)) {
- /* Need to undo the deallocation. */
- meta->free = argp->next;
- LSN(meta) = argp->meta_lsn;
- modified = 1;
- }
- if ((ret = mpf->put(mpf, meta, modified ? DB_MPOOL_DIRTY : 0)) != 0)
- goto out;
- meta = NULL;
- done: *lsnp = argp->prev_lsn;
- ret = 0;
- out: if (pagep != NULL)
- (void)mpf->put(mpf, pagep, 0);
- if (meta != NULL)
- (void)mpf->put(mpf, meta, 0);
- REC_CLOSE;
- }
- /*
- * __db_cksum_recover --
- * Recovery function for checksum failure log record.
- *
- * PUBLIC: int __db_cksum_recover __P((DB_ENV *,
- * PUBLIC: DBT *, DB_LSN *, db_recops, void *));
- */
- int
- __db_cksum_recover(dbenv, dbtp, lsnp, op, info)
- DB_ENV *dbenv;
- DBT *dbtp;
- DB_LSN *lsnp;
- db_recops op;
- void *info;
- {
- __db_cksum_args *argp;
- int ret;
- COMPQUIET(info, NULL);
- COMPQUIET(lsnp, NULL);
- COMPQUIET(op, DB_TXN_ABORT);
- REC_PRINT(__db_cksum_print);
- if ((ret = __db_cksum_read(dbenv, dbtp->data, &argp)) != 0)
- return (ret);
- /*
- * We had a checksum failure -- the only option is to run catastrophic
- * recovery.
- */
- if (F_ISSET(dbenv, DB_ENV_FATAL))
- ret = 0;
- else {
- __db_err(dbenv,
- "Checksum failure requires catastrophic recovery");
- ret = __db_panic(dbenv, DB_RUNRECOVERY);
- }
- __os_free(dbenv, argp);
- return (ret);
- }