97 lines
2.2 KiB
C
97 lines
2.2 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996,2008 Oracle. All rights reserved.
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*
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* $Id: hash_reclaim.c 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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#include "db_config.h"
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#include "db_int.h"
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#include "dbinc/db_page.h"
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#include "dbinc/hash.h"
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/*
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* __ham_reclaim --
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* Reclaim the pages from a subdatabase and return them to the
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* parent free list. For now, we link each freed page on the list
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* separately. If people really store hash databases in subdatabases
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* and do a lot of creates and deletes, this is going to be a problem,
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* because hash needs chunks of contiguous storage. We may eventually
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* need to go to a model where we maintain the free list with chunks of
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* contiguous pages as well.
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*
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* PUBLIC: int __ham_reclaim __P((DB *, DB_THREAD_INFO *, DB_TXN *txn));
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*/
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int
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__ham_reclaim(dbp, ip, txn)
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DB *dbp;
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DB_THREAD_INFO *ip;
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DB_TXN *txn;
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{
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DBC *dbc;
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HASH_CURSOR *hcp;
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int ret;
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/* Open up a cursor that we'll use for traversing. */
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if ((ret = __db_cursor(dbp, ip, txn, &dbc, 0)) != 0)
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return (ret);
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hcp = (HASH_CURSOR *)dbc->internal;
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if ((ret = __ham_get_meta(dbc)) != 0)
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goto err;
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/* Write lock the metapage for deallocations. */
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if ((ret = __ham_dirty_meta(dbc, 0)) != 0)
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goto err;
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/* Avoid locking every page, we have the handle locked exclusive. */
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F_SET(dbc, DBC_DONTLOCK);
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if ((ret = __ham_traverse(dbc,
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DB_LOCK_WRITE, __db_reclaim_callback, NULL, 1)) != 0)
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goto err;
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if ((ret = __dbc_close(dbc)) != 0)
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goto err;
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if ((ret = __ham_release_meta(dbc)) != 0)
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goto err;
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return (0);
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err: if (hcp->hdr != NULL)
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(void)__ham_release_meta(dbc);
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(void)__dbc_close(dbc);
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return (ret);
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}
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/*
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* __ham_truncate --
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* Reclaim the pages from a subdatabase and return them to the
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* parent free list.
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*
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* PUBLIC: int __ham_truncate __P((DBC *, u_int32_t *));
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*/
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int
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__ham_truncate(dbc, countp)
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DBC *dbc;
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u_int32_t *countp;
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{
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u_int32_t count;
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int ret, t_ret;
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if ((ret = __ham_get_meta(dbc)) != 0)
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return (ret);
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count = 0;
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ret = __ham_traverse(dbc,
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DB_LOCK_WRITE, __db_truncate_callback, &count, 1);
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if ((t_ret = __ham_release_meta(dbc)) != 0 && ret == 0)
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ret = t_ret;
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if (countp != NULL)
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*countp = count;
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return (ret);
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}
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