freebsd-dev/lib/libc/db/btree/bt_close.c

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1994-05-27 05:00:24 +00:00
/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Mike Olson.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)bt_close.c 8.3 (Berkeley) 2/21/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/param.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <db.h>
#include "btree.h"
static int bt_meta __P((BTREE *));
/*
* BT_CLOSE -- Close a btree.
*
* Parameters:
* dbp: pointer to access method
*
* Returns:
* RET_ERROR, RET_SUCCESS
*/
int
__bt_close(dbp)
DB *dbp;
{
BTREE *t;
int fd;
t = dbp->internal;
/* Toss any page pinned across calls. */
if (t->bt_pinned != NULL) {
mpool_put(t->bt_mp, t->bt_pinned, 0);
t->bt_pinned = NULL;
}
/*
* Delete any already deleted record that we've been saving
* because the cursor pointed to it.
*/
if (ISSET(t, B_DELCRSR) && __bt_crsrdel(t, &t->bt_bcursor))
return (RET_ERROR);
if (__bt_sync(dbp, 0) == RET_ERROR)
return (RET_ERROR);
if (mpool_close(t->bt_mp) == RET_ERROR)
return (RET_ERROR);
if (t->bt_stack)
free(t->bt_stack);
if (t->bt_kbuf)
free(t->bt_kbuf);
if (t->bt_dbuf)
free(t->bt_dbuf);
fd = t->bt_fd;
free(t);
free(dbp);
return (close(fd) ? RET_ERROR : RET_SUCCESS);
}
/*
* BT_SYNC -- sync the btree to disk.
*
* Parameters:
* dbp: pointer to access method
*
* Returns:
* RET_SUCCESS, RET_ERROR.
*/
int
__bt_sync(dbp, flags)
const DB *dbp;
u_int flags;
{
BTREE *t;
int status;
PAGE *h;
void *p;
t = dbp->internal;
/* Toss any page pinned across calls. */
if (t->bt_pinned != NULL) {
mpool_put(t->bt_mp, t->bt_pinned, 0);
t->bt_pinned = NULL;
}
/* Sync doesn't currently take any flags. */
if (flags != 0) {
errno = EINVAL;
return (RET_ERROR);
}
if (ISSET(t, B_INMEM | B_RDONLY) || !ISSET(t, B_MODIFIED))
return (RET_SUCCESS);
if (ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
return (RET_ERROR);
/*
* Nastiness. If the cursor has been marked for deletion, but not
* actually deleted, we have to make a copy of the page, delete the
* key/data item, sync the file, and then restore the original page
* contents.
*/
if (ISSET(t, B_DELCRSR)) {
if ((p = (void *)malloc(t->bt_psize)) == NULL)
return (RET_ERROR);
if ((h = mpool_get(t->bt_mp, t->bt_bcursor.pgno, 0)) == NULL)
return (RET_ERROR);
memmove(p, h, t->bt_psize);
if ((status =
__bt_dleaf(t, h, t->bt_bcursor.index)) == RET_ERROR)
goto ecrsr;
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
}
1995-05-30 05:51:47 +00:00
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if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
CLR(t, B_MODIFIED);
ecrsr: if (ISSET(t, B_DELCRSR)) {
if ((h = mpool_get(t->bt_mp, t->bt_bcursor.pgno, 0)) == NULL)
return (RET_ERROR);
memmove(h, p, t->bt_psize);
free(p);
mpool_put(t->bt_mp, h, MPOOL_DIRTY);
}
return (status);
}
/*
* BT_META -- write the tree meta data to disk.
*
* Parameters:
* t: tree
*
* Returns:
* RET_ERROR, RET_SUCCESS
*/
static int
bt_meta(t)
BTREE *t;
{
BTMETA m;
void *p;
if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
return (RET_ERROR);
/* Fill in metadata. */
m.m_magic = BTREEMAGIC;
m.m_version = BTREEVERSION;
m.m_psize = t->bt_psize;
m.m_free = t->bt_free;
m.m_nrecs = t->bt_nrecs;
m.m_flags = t->bt_flags & SAVEMETA;
memmove(p, &m, sizeof(BTMETA));
mpool_put(t->bt_mp, p, MPOOL_DIRTY);
return (RET_SUCCESS);
}