[apple/libc.git] / db / btree / FreeBSD / bt_close.c

/*-
 * Copyright (c) 1990, 1993, 1994
 *	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.
 * 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	8.7 (Berkeley) 8/17/94";
#endif /* LIBC_SCCS and not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_close.c,v 1.10 2009/03/02 23:47:18 delphij Exp $");

#include "namespace.h"
#include <sys/param.h>

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "un-namespace.h"

#include <db.h>
#include "btree.h"

static int bt_meta(BTREE *);

/*
 * BT_CLOSE -- Close a btree.
 *
 * Parameters:
 *	dbp:	pointer to access method
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
int
__bt_close(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;
	}

	/* Sync the tree. */
	if (__bt_sync(dbp, 0) == RET_ERROR)
		return (RET_ERROR);

	/* Close the memory pool. */
	if (mpool_close(t->bt_mp) == RET_ERROR)
		return (RET_ERROR);

	/* Free random memory. */
	if (t->bt_cursor.key.data != NULL) {
		free(t->bt_cursor.key.data);
		t->bt_cursor.key.size = 0;
		t->bt_cursor.key.data = NULL;
	}
	if (t->bt_rkey.data) {
		free(t->bt_rkey.data);
		t->bt_rkey.size = 0;
		t->bt_rkey.data = NULL;
	}
	if (t->bt_rdata.data) {
		free(t->bt_rdata.data);
		t->bt_rdata.size = 0;
		t->bt_rdata.data = NULL;
	}

	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(const DB *dbp, u_int flags)
{
	BTREE *t;
	int status;

	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 (F_ISSET(t, B_INMEM | B_RDONLY) || !F_ISSET(t, B_MODIFIED))
		return (RET_SUCCESS);

	if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
		return (RET_ERROR);

	if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
		F_CLR(t, B_MODIFIED);

	return (status);
}

/*
 * BT_META -- write the tree meta data to disk.
 *
 * Parameters:
 *	t:	tree
 *
 * Returns:
 *	RET_ERROR, RET_SUCCESS
 */
static int
bt_meta(BTREE *t)
{
	BTMETA m;
	void *p;

	if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
		return (RET_ERROR);

	/* Fill in metadata. */
	m.magic = BTREEMAGIC;
	m.version = BTREEVERSION;
	m.psize = t->bt_psize;
	m.free = t->bt_free;
	m.nrecs = t->bt_nrecs;
	m.flags = F_ISSET(t, SAVEMETA);

	memmove(p, &m, sizeof(BTMETA));
	mpool_put(t->bt_mp, p, MPOOL_DIRTY);
	return (RET_SUCCESS);
}
Commit	Line	Data
9385eb3d A	1	/*-
9385eb3d A	2	* Copyright (c) 1990, 1993, 1994
e9ce8d39 A	3	* The Regents of the University of California. All rights reserved.
	4	*
	5	* This code is derived from software contributed to Berkeley by
	6	* Mike Olson.
	7	*
	8	* Redistribution and use in source and binary forms, with or without
	9	* modification, are permitted provided that the following conditions
	10	* are met:
	11	* 1. Redistributions of source code must retain the above copyright
	12	* notice, this list of conditions and the following disclaimer.
	13	* 2. Redistributions in binary form must reproduce the above copyright
	14	* notice, this list of conditions and the following disclaimer in the
	15	* documentation and/or other materials provided with the distribution.
e9ce8d39 A	16	* 4. Neither the name of the University nor the names of its contributors
	17	* may be used to endorse or promote products derived from this software
	18	* without specific prior written permission.
	19	*
	20	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
	21	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
	22	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
	23	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	24	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
	25	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
	26	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
	27	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
	28	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
	29	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
	30	* SUCH DAMAGE.
	31	*/
	32
9385eb3d A	33	#if defined(LIBC_SCCS) && !defined(lint)
	34	static char sccsid[] = "@(#)bt_close.c 8.7 (Berkeley) 8/17/94";
	35	#endif /* LIBC_SCCS and not lint */
	36	#include <sys/cdefs.h>
1f2f436a	37	__FBSDID("$FreeBSD: src/lib/libc/db/btree/bt_close.c,v 1.10 2009/03/02 23:47:18 delphij Exp $");
e9ce8d39	38
59e0d9fe	39	#include "namespace.h"
e9ce8d39 A	40	#include <sys/param.h>
	41
	42	#include <errno.h>
	43	#include <stdio.h>
	44	#include <stdlib.h>
	45	#include <string.h>
	46	#include <unistd.h>
59e0d9fe	47	#include "un-namespace.h"
e9ce8d39 A	48
	49	#include <db.h>
	50	#include "btree.h"
	51
9385eb3d	52	static int bt_meta(BTREE *);
e9ce8d39 A	53
	54	/*
	55	* BT_CLOSE -- Close a btree.
	56	*
	57	* Parameters:
	58	* dbp: pointer to access method
	59	*
	60	* Returns:
	61	* RET_ERROR, RET_SUCCESS
	62	*/
	63	int
1f2f436a	64	__bt_close(DB *dbp)
e9ce8d39 A	65	{
	66	BTREE *t;
	67	int fd;
	68
	69	t = dbp->internal;
	70
	71	/* Toss any page pinned across calls. */
	72	if (t->bt_pinned != NULL) {
	73	mpool_put(t->bt_mp, t->bt_pinned, 0);
	74	t->bt_pinned = NULL;
	75	}
	76
9385eb3d	77	/* Sync the tree. */
e9ce8d39 A	78	if (__bt_sync(dbp, 0) == RET_ERROR)
	79	return (RET_ERROR);
	80
9385eb3d	81	/* Close the memory pool. */
e9ce8d39 A	82	if (mpool_close(t->bt_mp) == RET_ERROR)
	83	return (RET_ERROR);
	84
9385eb3d A	85	/* Free random memory. */
	86	if (t->bt_cursor.key.data != NULL) {
	87	free(t->bt_cursor.key.data);
	88	t->bt_cursor.key.size = 0;
	89	t->bt_cursor.key.data = NULL;
	90	}
	91	if (t->bt_rkey.data) {
	92	free(t->bt_rkey.data);
	93	t->bt_rkey.size = 0;
	94	t->bt_rkey.data = NULL;
	95	}
	96	if (t->bt_rdata.data) {
	97	free(t->bt_rdata.data);
	98	t->bt_rdata.size = 0;
	99	t->bt_rdata.data = NULL;
	100	}
e9ce8d39 A	101
	102	fd = t->bt_fd;
	103	free(t);
	104	free(dbp);
59e0d9fe	105	return (_close(fd) ? RET_ERROR : RET_SUCCESS);
e9ce8d39 A	106	}
	107
	108	/*
	109	* BT_SYNC -- sync the btree to disk.
	110	*
	111	* Parameters:
	112	* dbp: pointer to access method
	113	*
	114	* Returns:
	115	* RET_SUCCESS, RET_ERROR.
	116	*/
	117	int
1f2f436a	118	__bt_sync(const DB *dbp, u_int flags)
e9ce8d39 A	119	{
	120	BTREE *t;
	121	int status;
e9ce8d39 A	122
	123	t = dbp->internal;
	124
	125	/* Toss any page pinned across calls. */
	126	if (t->bt_pinned != NULL) {
	127	mpool_put(t->bt_mp, t->bt_pinned, 0);
	128	t->bt_pinned = NULL;
	129	}
	130
	131	/* Sync doesn't currently take any flags. */
	132	if (flags != 0) {
	133	errno = EINVAL;
	134	return (RET_ERROR);
	135	}
	136
9385eb3d	137	if (F_ISSET(t, B_INMEM \| B_RDONLY) \|\| !F_ISSET(t, B_MODIFIED))
e9ce8d39 A	138	return (RET_SUCCESS);
e9ce8d39 A	139
9385eb3d	140	if (F_ISSET(t, B_METADIRTY) && bt_meta(t) == RET_ERROR)
e9ce8d39 A	141	return (RET_ERROR);
e9ce8d39 A	142
e9ce8d39	143	if ((status = mpool_sync(t->bt_mp)) == RET_SUCCESS)
9385eb3d A	144	F_CLR(t, B_MODIFIED);
9385eb3d A	145
e9ce8d39 A	146	return (status);
	147	}
	148
	149	/*
	150	* BT_META -- write the tree meta data to disk.
	151	*
	152	* Parameters:
	153	* t: tree
	154	*
	155	* Returns:
	156	* RET_ERROR, RET_SUCCESS
	157	*/
	158	static int
1f2f436a	159	bt_meta(BTREE *t)
e9ce8d39 A	160	{
	161	BTMETA m;
	162	void *p;
	163
	164	if ((p = mpool_get(t->bt_mp, P_META, 0)) == NULL)
	165	return (RET_ERROR);
	166
	167	/* Fill in metadata. */
9385eb3d A	168	m.magic = BTREEMAGIC;
	169	m.version = BTREEVERSION;
	170	m.psize = t->bt_psize;
	171	m.free = t->bt_free;
	172	m.nrecs = t->bt_nrecs;
	173	m.flags = F_ISSET(t, SAVEMETA);
e9ce8d39 A	174
	175	memmove(p, &m, sizeof(BTMETA));
	176	mpool_put(t->bt_mp, p, MPOOL_DIRTY);
	177	return (RET_SUCCESS);
	178	}