rec_close.c

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/*-
 * Copyright (c) 1990, 1993, 1994
 * The Regents of the University of California. All rights reserved.
 *
 * 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[] = "@(#)rec_close.c 8.6 (Berkeley) 8/18/94";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#include <sys/mman.h>

#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <unistd.h>

#include "../include/db.h"
#include "recno.h"

/*
 * __REC_CLOSE -- Close a recno tree.
 *
 * Parameters:
 * dbp: pointer to access method
 *
 * Returns:
 * RET_ERROR, RET_SUCCESS
 */
int
__rec_close(dbp)
 DB *dbp;
{
 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;
 }

 if (__rec_sync(dbp, 0) == RET_ERROR)
 return (RET_ERROR);

 /* Committed to closing. */
 status = RET_SUCCESS;
 if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
 status = RET_ERROR;

 if (!F_ISSET(t, R_INMEM)) {
 if (F_ISSET(t, R_CLOSEFP)) {
 if (fclose(t->bt_rfp))
 status = RET_ERROR;
 } else
 if (close(t->bt_rfd))
 status = RET_ERROR;
 }

 if (__bt_close(dbp) == RET_ERROR)
 status = RET_ERROR;

 return (status);
}

/*
 * __REC_SYNC -- sync the recno tree to disk.
 *
 * Parameters:
 * dbp: pointer to access method
 *
 * Returns:
 * RET_SUCCESS, RET_ERROR.
 */
int
__rec_sync(dbp, flags)
 const DB *dbp;
 u_int flags;
{
 struct iovec iov[2];
 BTREE *t;
 DBT data, key;
 off_t off;
 recno_t scursor, trec;
 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;
 }

 if (flags == R_RECNOSYNC)
 return (__bt_sync(dbp, 0));

 if (F_ISSET(t, R_RDONLY | R_INMEM) || !F_ISSET(t, R_MODIFIED))
 return (RET_SUCCESS);

 /* Read any remaining records into the tree. */
 if (!F_ISSET(t, R_EOF) && t->bt_irec(t, MAX_REC_NUMBER) == RET_ERROR)
 return (RET_ERROR);

 /* Rewind the file descriptor. */
 if (lseek(t->bt_rfd, (off_t)0, SEEK_SET) != 0)
 return (RET_ERROR);

 /* Save the cursor. */
 scursor = t->bt_cursor.rcursor;

 key.size = sizeof(recno_t);
 key.data = &trec;

 if (F_ISSET(t, R_FIXLEN)) {
 /*
 * We assume that fixed length records are all fixed length.
 * Any that aren't are either EINVAL'd or corrected by the
 * record put code.
 */
 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 while (status == RET_SUCCESS) {
 if ((size_t) write(t->bt_rfd, data.data, data.size) != data.size)
 return (RET_ERROR);
 status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 }
 } else {
 iov[1].iov_base = &t->bt_bval;
 iov[1].iov_len = 1;

 status = (dbp->seq)(dbp, &key, &data, R_FIRST);
 while (status == RET_SUCCESS) {
 iov[0].iov_base = data.data;
 iov[0].iov_len = data.size;
 if ((size_t) writev(t->bt_rfd, iov, 2) != data.size + 1)
 return (RET_ERROR);
 status = (dbp->seq)(dbp, &key, &data, R_NEXT);
 }
 }

 /* Restore the cursor. */
 t->bt_cursor.rcursor = scursor;

 if (status == RET_ERROR)
 return (RET_ERROR);
 if ((off = lseek(t->bt_rfd, (off_t)0, SEEK_CUR)) == -1)
 return (RET_ERROR);
 if (ftruncate(t->bt_rfd, off))
 return (RET_ERROR);
 F_CLR(t, R_MODIFIED);
 return (RET_SUCCESS);
}