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123 lines
2.4 KiB
123 lines
2.4 KiB
3 years ago
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1999
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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 sccsid[] = "@(#)hash_meta.c 11.3 (Sleepycat) 9/14/99";
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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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#include <errno.h>
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#endif
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#include "db_int.h"
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#include "db_page.h"
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#include "hash.h"
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#include "db_shash.h"
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#include "lock.h"
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#include "txn.h"
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/*
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* Acquire the meta-data page.
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*
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* PUBLIC: int CDB___ham_get_meta __P((DBC *));
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*/
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int
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CDB___ham_get_meta(dbc)
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DBC *dbc;
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{
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HASH_CURSOR *hcp;
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HASH *hashp;
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DB *dbp;
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int ret;
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hcp = dbc->internal;
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dbp = dbc->dbp;
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hashp = dbp->h_internal;
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if (dbp->dbenv != NULL && F_ISSET(dbp->dbenv, DB_ENV_LOCKING) &&
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!F_ISSET(dbc, DBC_RECOVER)) {
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dbc->lock.pgno = hashp->meta_pgno;
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if ((ret = CDB_lock_get(dbp->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 = CDB___ham_get_page(dbc->dbp,
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hashp->meta_pgno, (PAGE **)&(hcp->hdr))) != 0 &&
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hcp->hlock.off != LOCK_INVALID) {
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(void)CDB_lock_put(dbc->dbp->dbenv, &hcp->hlock);
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hcp->hlock.off = LOCK_INVALID;
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}
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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 CDB___ham_release_meta __P((DBC *));
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*/
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int
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CDB___ham_release_meta(dbc)
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DBC *dbc;
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{
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HASH_CURSOR *hcp;
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hcp = dbc->internal;
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if (hcp->hdr)
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(void)CDB___ham_put_page(dbc->dbp, (PAGE *)hcp->hdr,
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F_ISSET(hcp, H_DIRTY) ? 1 : 0);
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hcp->hdr = NULL;
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if (!F_ISSET(dbc, DBC_RECOVER) &&
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dbc->txn == NULL && hcp->hlock.off != LOCK_INVALID)
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(void)CDB_lock_put(dbc->dbp->dbenv, &hcp->hlock);
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hcp->hlock.off = LOCK_INVALID;
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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 CDB___ham_dirty_meta __P((DBC *));
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*/
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int
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CDB___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_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 = dbc->internal;
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ret = 0;
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if (F_ISSET(dbp->dbenv, DB_ENV_LOCKING) && !F_ISSET(dbc, DBC_RECOVER)) {
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dbc->lock.pgno = hashp->meta_pgno;
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if ((ret = CDB_lock_get(dbp->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 = CDB_lock_put(dbp->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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