8a16b7a18f
Mainly focus on files that use BSD 3-Clause license. The Software Package Data Exchange (SPDX) group provides a specification to make it easier for automated tools to detect and summarize well known opensource licenses. We are gradually adopting the specification, noting that the tags are considered only advisory and do not, in any way, superceed or replace the license texts. Special thanks to Wind River for providing access to "The Duke of Highlander" tool: an older (2014) run over FreeBSD tree was useful as a starting point.
182 lines
4.3 KiB
C
182 lines
4.3 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 1990, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Mike Olson.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94";
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#endif /* LIBC_SCCS and not lint */
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include "namespace.h"
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#include <sys/param.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "un-namespace.h"
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#include <db.h>
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#include "btree.h"
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static int bt_meta(BTREE *);
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/*
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* BT_CLOSE -- Close a btree.
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*
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* Parameters:
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* dbp: pointer to access method
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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int
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__bt_close(DB *dbp)
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{
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BTREE *t;
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int fd;
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t = dbp->internal;
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/* Toss any page pinned across calls. */
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if (t->bt_pinned != NULL) {
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mpool_put(t->bt_mp, t->bt_pinned, 0);
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t->bt_pinned = NULL;
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}
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/* Sync the tree. */
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if (__bt_sync(dbp, 0) == RET_ERROR)
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return (RET_ERROR);
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/* Close the memory pool. */
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if (mpool_close(t->bt_mp) == RET_ERROR)
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return (RET_ERROR);
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/* Free random memory. */
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if (t->bt_cursor.key.data != NULL) {
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free(t->bt_cursor.key.data);
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t->bt_cursor.key.size = 0;
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t->bt_cursor.key.data = NULL;
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}
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if (t->bt_rkey.data) {
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free(t->bt_rkey.data);
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t->bt_rkey.size = 0;
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t->bt_rkey.data = NULL;
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}
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if (t->bt_rdata.data) {
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free(t->bt_rdata.data);
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t->bt_rdata.size = 0;
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t->bt_rdata.data = NULL;
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}
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fd = t->bt_fd;
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free(t);
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free(dbp);
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return (_close(fd) ? RET_ERROR : RET_SUCCESS);
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}
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/*
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* BT_SYNC -- sync the btree to disk.
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*
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* Parameters:
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* dbp: pointer to access method
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*
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* Returns:
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* RET_SUCCESS, RET_ERROR.
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*/
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int
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__bt_sync(const DB *dbp, u_int flags)
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{
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BTREE *t;
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int status;
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t = dbp->internal;
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/* Toss any page pinned across calls. */
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if (t->bt_pinned != NULL) {
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mpool_put(t->bt_mp, t->bt_pinned, 0);
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t->bt_pinned = NULL;
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}
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/* Sync doesn't currently take any flags. */
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if (flags != 0) {
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errno = EINVAL;
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return (RET_ERROR);
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}
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if (F_ISSET(t, B_INMEM | B_RDONLY) ||
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!F_ISSET(t, B_MODIFIED | B_METADIRTY))
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return (RET_SUCCESS);
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if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
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return (RET_ERROR);
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if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
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F_CLR(t, B_MODIFIED);
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return (status);
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}
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/*
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* BT_META -- write the tree meta data to disk.
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*
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* Parameters:
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* t: tree
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS
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*/
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static int
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bt_meta(BTREE *t)
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{
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BTMETA m;
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void *p;
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if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
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return (RET_ERROR);
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/* Fill in metadata. */
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m.magic = BTREEMAGIC;
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m.version = BTREEVERSION;
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m.psize = t->bt_psize;
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m.free = t->bt_free;
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m.nrecs = t->bt_nrecs;
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m.flags = F_ISSET(t, SAVEMETA);
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memmove(p, &m, sizeof(BTMETA));
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mpool_put(t->bt_mp, p, MPOOL_DIRTY);
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return (RET_SUCCESS);
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}
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