#include "db_config.h" #ifndef NO_SYSTEM_INCLUDES #include <sys/types.h> #include <string.h> #endif #include "db_int.h" #include "dbinc/db_page.h" #include "dbinc/__dbreg.h" #include "dbinc/log.h" /* * __dbreg_register_recover -- * Recovery function for register. * * PUBLIC: int __dbreg_register_recover * PUBLIC: __P((DB_ENV *, DBT *, DB_LSN *, db_recops, void *)); */ int __dbreg_register_recover(dbenv, dbtp, lsnp, op, info) DB_ENV *dbenv; DBT *dbtp; DB_LSN *lsnp; db_recops op; void *info; { __dbreg_register_args *argp; DB *file_dbp; DBC *dbc; DB_MPOOLFILE *mpf; PAGE *pagep; int cmp_n, cmp_p, modified, ret; REC_PRINT(__dbreg_register_print); REC_INTRO(__dbreg_register_read, 1); if ((ret = mpf->get(mpf, &argp->pgno, 0, &pagep)) != 0) if (DB_REDO(op)) { if ((ret = mpf->get(mpf, &argp->pgno, DB_MPOOL_CREATE, &pagep)) != 0) goto out; } else { *lsnp = argp->prev_lsn; ret = 0; goto out; } modified = 0; cmp_n = log_compare(lsnp, &LSN(pagep)); /* * Use this when there is something like "pagelsn" in the argp * structure. Sometimes, you might need to compare meta-data * lsn's instead. * * cmp_p = log_compare(&LSN(pagep), argp->pagelsn); */ if (cmp_p == 0 && DB_REDO(op)) { /* Need to redo update described. */ modified = 1; } else if (cmp_n == 0 && !DB_REDO(op)) { /* Need to undo update described. */ modified = 1; } if (ret = mpf->put(mpf, pagep, modified ? DB_MPOOL_DIRTY : 0)) goto out; *lsnp = argp->prev_lsn; ret = 0; out: REC_CLOSE; }