mirror of
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66 lines
1.3 KiB
Text
66 lines
1.3 KiB
Text
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/*
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* PREF_FUNC_recover --
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* Recovery function for FUNC.
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*
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* PUBLIC: int PREF_FUNC_recover
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* PUBLIC: __P((env *, DBT *, DB_LSN *, db_recops, void *));
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*/
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int
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PREF_FUNC_recover(env, dbtp, lsnp, op, info)
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env *env;
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DBT *dbtp;
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DB_LSN *lsnp;
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db_recops op;
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void *info;
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{
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PREF_DUP_args *argp;
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DB *file_dbp;
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DBC *dbc;
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DB_MPOOLFILE *mpf;
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DB_THREAD_INFO *ip;
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PAGE *pagep;
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int cmp_n, cmp_p, modified, ret;
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ip = ((DB_TXNHEAD *)info)->thread_info;
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REC_PRINT(PREF_DUP_print);
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REC_INTRO(PREF_DUP_read, ip, 0);
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if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0)
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if (DB_REDO(op)) {
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if ((ret = mpf->get(mpf,
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&argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0)
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goto out;
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} else {
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*lsnp = argp->prev_lsn;
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ret = 0;
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goto out;
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}
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modified = 0;
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cmp_n = log_compare(lsnp, &LSN(pagep));
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/*
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* Use this when there is something like "pagelsn" in the argp
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* structure. Sometimes, you might need to compare meta-data
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* lsn's instead.
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*
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* cmp_p = log_compare(&LSN(pagep), argp->pagelsn);
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*/
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if (cmp_p == 0 && DB_REDO(op)) {
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/* Need to redo update described. */
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modified = 1;
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} else if (cmp_n == 0 && !DB_REDO(op)) {
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/* Need to undo update described. */
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modified = 1;
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}
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if (ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0))
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goto out;
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*lsnp = argp->prev_lsn;
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ret = 0;
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out: REC_CLOSE;
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}
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