root/libdb/bt_close.c(59.html)

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DEFINITIONS

This source file includes following definitions.
  1. __bt_close
  2. __bt_sync
  3. bt_meta

/*-
 * 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.
 * 3. 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 */
#ifdef HAVE_CONFIG_H #include <config.h> #endif #include <errno.h> #include <stdio.h> #ifdef STDC_HEADERS #include <stdlib.h> #endif #ifdef HAVE_STRING_H #include <string.h> #else #include <strings.h> #endif #ifdef HAVE_UNISTD_H #include <unistd.h> #endif #include "db.h" #include "btree.h" static int bt_meta(BTREE *); /* * BT_CLOSE -- Close a btree. * * Parameters: * dbp: pointer to access method * abandon: 1: don't sync, 0: sync * * Returns: * RET_ERROR, RET_SUCCESS */
int __bt_close(dbp, abandon) DB *dbp; int abandon; { 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 abandon flag is set, omit writing to the disk. * Since the writing spend much time, you should use this flag * when you remove the file after closing. */
if (!abandon && __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(dbp, flags) 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(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.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); }

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