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135 lines
3.3 KiB
135 lines
3.3 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) 1996, 1997, 1998, 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[] = "@(#)db_reclaim.c 11.2 (Sleepycat) 9/10/99";
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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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#endif
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#include "db_int.h"
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#include "db_page.h"
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#include "db_am.h"
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/*
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* Assume that we enter with a valid pgno. We traverse a set of
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* duplicate pages. The format of the callback routine is:
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* callback(dbp, page, cookie, did_put). did_put is an output
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* value that will be set to 1 by the callback routine if it
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* already put the page back. Otherwise, this routine must
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* put the page.
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*
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* PUBLIC: int CDB___db_traverse_dup __P((DB *,
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* PUBLIC: db_pgno_t, int (*)(DB *, PAGE *, void *, int *), void *));
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*/
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int
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CDB___db_traverse_dup(dbp, pgno, callback, cookie)
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DB *dbp;
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db_pgno_t pgno;
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int (*callback) __P((DB *, PAGE *, void *, int *));
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void *cookie;
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{
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PAGE *p;
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int did_put, i, opgno, ret;
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do {
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did_put = 0;
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if ((ret = CDB_memp_fget(dbp->mpf, &pgno, 0, &p)) != 0)
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return (ret);
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pgno = NEXT_PGNO(p);
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for (i = 0; i < NUM_ENT(p); i++) {
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if (B_TYPE(GET_BKEYDATA(p, i)->type) == B_OVERFLOW) {
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opgno = GET_BOVERFLOW(p, i)->pgno;
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if ((ret = CDB___db_traverse_big(dbp,
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opgno, callback, cookie)) != 0)
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goto err;
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}
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}
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if ((ret = callback(dbp, p, cookie, &did_put)) != 0)
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goto err;
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if (!did_put)
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if ((ret = CDB_memp_fput(dbp->mpf, p, 0)) != 0)
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return (ret);
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} while (pgno != PGNO_INVALID);
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if (0) {
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err: if (did_put == 0)
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(void)CDB_memp_fput(dbp->mpf, p, 0);
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}
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return (ret);
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}
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/*
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* CDB___db_traverse_big
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* Traverse a chain of overflow pages and call the callback routine
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* on each one. The calling convention for the callback is:
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* callback(dbp, page, cookie, did_put),
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* where did_put is a return value indicating if the page in question has
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* already been returned to the mpool.
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*
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* PUBLIC: int CDB___db_traverse_big __P((DB *,
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* PUBLIC: db_pgno_t, int (*)(DB *, PAGE *, void *, int *), void *));
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*/
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int
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CDB___db_traverse_big(dbp, pgno, callback, cookie)
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DB *dbp;
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db_pgno_t pgno;
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int (*callback) __P((DB *, PAGE *, void *, int *));
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void *cookie;
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{
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PAGE *p;
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int did_put, ret;
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do {
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did_put = 0;
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if ((ret = CDB_memp_fget(dbp->mpf, &pgno, 0, &p)) != 0)
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return (ret);
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pgno = NEXT_PGNO(p);
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if ((ret = callback(dbp, p, cookie, &did_put)) == 0 &&
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!did_put)
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ret = CDB_memp_fput(dbp->mpf, p, 0);
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} while (ret == 0 && pgno != PGNO_INVALID);
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return (ret);
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}
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/*
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* CDB___db_reclaim_callback
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* This is the callback routine used during a delete of a subdatabase.
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* we are traversing a btree or hash table and trying to free all the
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* pages. Since they share common code for duplicates and overflow
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* items, we traverse them identically and use this routine to do the
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* actual free. The reason that this is callback is because hash uses
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* the same traversal code for statistics gathering.
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*
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* PUBLIC: int CDB___db_reclaim_callback __P((DB *, PAGE *, void *, int *));
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*/
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int
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CDB___db_reclaim_callback(dbp, p, cookie, putp)
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DB *dbp;
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PAGE *p;
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void *cookie;
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int *putp;
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{
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int ret;
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COMPQUIET(dbp, NULL);
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if ((ret = CDB___db_free(cookie, p)) != 0)
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return (ret);
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*putp = 1;
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return (0);
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}
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