hash_reclaim.c
上传用户:tsgydb
上传日期:2007-04-14
资源大小:10674k
文件大小:2k
- /*-
- * See the file LICENSE for redistribution information.
- *
- * Copyright (c) 1996, 1997, 1998, 1999, 2000
- * Sleepycat Software. All rights reserved.
- */
- #include "db_config.h"
- #ifndef lint
- static const char revid[] = "$Id: hash_reclaim.c,v 11.4 2000/11/30 00:58:37 ubell Exp $";
- #endif /* not lint */
- #ifndef NO_SYSTEM_INCLUDES
- #include <sys/types.h>
- #include <string.h>
- #endif
- #include "db_int.h"
- #include "db_page.h"
- #include "db_shash.h"
- #include "hash.h"
- #include "lock.h"
- /*
- * __ham_reclaim --
- * Reclaim the pages from a subdatabase and return them to the
- * parent free list. For now, we link each freed page on the list
- * separately. If people really store hash databases in subdatabases
- * and do a lot of creates and deletes, this is going to be a problem,
- * because hash needs chunks of contiguous storage. We may eventually
- * need to go to a model where we maintain the free list with chunks of
- * contiguous pages as well.
- *
- * PUBLIC: int __ham_reclaim __P((DB *, DB_TXN *txn));
- */
- int
- __ham_reclaim(dbp, txn)
- DB *dbp;
- DB_TXN *txn;
- {
- DBC *dbc;
- HASH_CURSOR *hcp;
- int ret;
- /* Open up a cursor that we'll use for traversing. */
- if ((ret = dbp->cursor(dbp, txn, &dbc, 0)) != 0)
- return (ret);
- hcp = (HASH_CURSOR *)dbc->internal;
- if ((ret = __ham_get_meta(dbc)) != 0)
- goto err;
- if ((ret = __ham_traverse(dbp,
- dbc, DB_LOCK_WRITE, __db_reclaim_callback, dbc)) != 0)
- goto err;
- if ((ret = dbc->c_close(dbc)) != 0)
- goto err;
- if ((ret = __ham_release_meta(dbc)) != 0)
- goto err;
- return (0);
- err: if (hcp->hdr != NULL)
- (void)__ham_release_meta(dbc);
- (void)dbc->c_close(dbc);
- return (ret);
- }