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125 lines
2.5 KiB
C
125 lines
2.5 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1999-2002
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* Sleepycat Software. All rights reserved.
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*/
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#include "db_config.h"
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#ifndef lint
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static const char revid[] = "$Id: hash_meta.c,v 11.19 2002/06/03 14:22:15 ubell Exp $";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#endif
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#include "db_int.h"
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#include "dbinc/db_page.h"
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#include "dbinc/db_shash.h"
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#include "dbinc/hash.h"
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#include "dbinc/lock.h"
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/*
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* Acquire the meta-data page.
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*
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* PUBLIC: int __ham_get_meta __P((DBC *));
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*/
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int
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__ham_get_meta(dbc)
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DBC *dbc;
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{
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DB *dbp;
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DB_ENV *dbenv;
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DB_MPOOLFILE *mpf;
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HASH *hashp;
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HASH_CURSOR *hcp;
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int ret;
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dbp = dbc->dbp;
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dbenv = dbp->dbenv;
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mpf = dbp->mpf;
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hashp = dbp->h_internal;
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hcp = (HASH_CURSOR *)dbc->internal;
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if (dbenv != NULL &&
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STD_LOCKING(dbc) && !F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE)) {
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dbc->lock.pgno = hashp->meta_pgno;
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if ((ret = dbenv->lock_get(dbenv, dbc->locker,
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DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
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&dbc->lock_dbt, DB_LOCK_READ, &hcp->hlock)) != 0)
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return (ret);
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}
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if ((ret = mpf->get(mpf,
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&hashp->meta_pgno, DB_MPOOL_CREATE, &(hcp->hdr))) != 0 &&
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LOCK_ISSET(hcp->hlock))
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(void)dbenv->lock_put(dbenv, &hcp->hlock);
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return (ret);
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}
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/*
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* Release the meta-data page.
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*
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* PUBLIC: int __ham_release_meta __P((DBC *));
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*/
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int
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__ham_release_meta(dbc)
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DBC *dbc;
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{
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DB_MPOOLFILE *mpf;
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HASH_CURSOR *hcp;
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mpf = dbc->dbp->mpf;
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hcp = (HASH_CURSOR *)dbc->internal;
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if (hcp->hdr)
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(void)mpf->put(mpf, hcp->hdr,
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F_ISSET(hcp, H_DIRTY) ? DB_MPOOL_DIRTY : 0);
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hcp->hdr = NULL;
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if (!F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE) &&
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dbc->txn == NULL && LOCK_ISSET(hcp->hlock))
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(void)dbc->dbp->dbenv->lock_put(dbc->dbp->dbenv, &hcp->hlock);
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F_CLR(hcp, H_DIRTY);
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return (0);
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}
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/*
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* Mark the meta-data page dirty.
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*
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* PUBLIC: int __ham_dirty_meta __P((DBC *));
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*/
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int
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__ham_dirty_meta(dbc)
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DBC *dbc;
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{
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DB *dbp;
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DB_ENV *dbenv;
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DB_LOCK _tmp;
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HASH *hashp;
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HASH_CURSOR *hcp;
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int ret;
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dbp = dbc->dbp;
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hashp = dbp->h_internal;
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hcp = (HASH_CURSOR *)dbc->internal;
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ret = 0;
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if (STD_LOCKING(dbc) && !F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE)) {
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dbenv = dbp->dbenv;
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dbc->lock.pgno = hashp->meta_pgno;
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if ((ret = dbenv->lock_get(dbenv, dbc->locker,
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DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
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&dbc->lock_dbt, DB_LOCK_WRITE, &_tmp)) == 0) {
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ret = dbenv->lock_put(dbenv, &hcp->hlock);
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hcp->hlock = _tmp;
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}
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}
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if (ret == 0)
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F_SET(hcp, H_DIRTY);
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return (ret);
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}
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