hash_meta.c
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上传日期:2022-05-23
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文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1999-2002
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: hash_meta.c,v 11.19 2002/06/03 14:22:15 ubell Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #endif
- #include "db_int.h"
- #include "dbinc/db_page.h"
- #include "dbinc/db_shash.h"
- #include "dbinc/hash.h"
- #include "dbinc/lock.h"
- /*
- * Acquire the meta-data page.
- *
- * PUBLIC: int __ham_get_meta __P((DBC *));
- */
- int
- __ham_get_meta(dbc)
- DBC *dbc;
- {
- DB *dbp;
- DB_ENV *dbenv;
- DB_MPOOLFILE *mpf;
- HASH *hashp;
- HASH_CURSOR *hcp;
- int ret;
- dbp = dbc->dbp;
- dbenv = dbp->dbenv;
- mpf = dbp->mpf;
- hashp = dbp->h_internal;
- hcp = (HASH_CURSOR *)dbc->internal;
- if (dbenv != NULL &&
- STD_LOCKING(dbc) && !F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE)) {
- dbc->lock.pgno = hashp->meta_pgno;
- if ((ret = dbenv->lock_get(dbenv, dbc->locker,
- DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
- &dbc->lock_dbt, DB_LOCK_READ, &hcp->hlock)) != 0)
- return (ret);
- }
- if ((ret = mpf->get(mpf,
- &hashp->meta_pgno, DB_MPOOL_CREATE, &(hcp->hdr))) != 0 &&
- LOCK_ISSET(hcp->hlock))
- (void)dbenv->lock_put(dbenv, &hcp->hlock);
- return (ret);
- }
- /*
- * Release the meta-data page.
- *
- * PUBLIC: int __ham_release_meta __P((DBC *));
- */
- int
- __ham_release_meta(dbc)
- DBC *dbc;
- {
- DB_MPOOLFILE *mpf;
- HASH_CURSOR *hcp;
- mpf = dbc->dbp->mpf;
- hcp = (HASH_CURSOR *)dbc->internal;
- if (hcp->hdr)
- (void)mpf->put(mpf, hcp->hdr,
- F_ISSET(hcp, H_DIRTY) ? DB_MPOOL_DIRTY : 0);
- hcp->hdr = NULL;
- if (!F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE) &&
- dbc->txn == NULL && LOCK_ISSET(hcp->hlock))
- (void)dbc->dbp->dbenv->lock_put(dbc->dbp->dbenv, &hcp->hlock);
- F_CLR(hcp, H_DIRTY);
- return (0);
- }
- /*
- * Mark the meta-data page dirty.
- *
- * PUBLIC: int __ham_dirty_meta __P((DBC *));
- */
- int
- __ham_dirty_meta(dbc)
- DBC *dbc;
- {
- DB *dbp;
- DB_ENV *dbenv;
- DB_LOCK _tmp;
- HASH *hashp;
- HASH_CURSOR *hcp;
- int ret;
- dbp = dbc->dbp;
- hashp = dbp->h_internal;
- hcp = (HASH_CURSOR *)dbc->internal;
- ret = 0;
- if (STD_LOCKING(dbc) && !F_ISSET(dbc, DBC_RECOVER | DBC_COMPENSATE)) {
- dbenv = dbp->dbenv;
- dbc->lock.pgno = hashp->meta_pgno;
- if ((ret = dbenv->lock_get(dbenv, dbc->locker,
- DB_NONBLOCK(dbc) ? DB_LOCK_NOWAIT : 0,
- &dbc->lock_dbt, DB_LOCK_WRITE, &_tmp)) == 0) {
- ret = dbenv->lock_put(dbenv, &hcp->hlock);
- hcp->hlock = _tmp;
- }
- }
- if (ret == 0)
- F_SET(hcp, H_DIRTY);
- return (ret);
- }