libdb2/recno/rec_close.c

/*-
 * 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 8.9 (Berkeley) 11/18/94";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <sys/uio.h>
#ifdef RECNO_USE_MMAP
#include <sys/mman.h>
#endif

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

#include "db-int.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;
#ifdef  RECNO_USE_MMAP
    if (F_ISSET(t, R_MEMMAPPED) && munmap(t->bt_smap, t->bt_msize))
        status = RET_ERROR;
#endif

    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 (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 = (char *)&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 (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);
}