rrfs_updatedir.c

一款类linux的操作系统源码

/* 
 *  Roadrunner/pk
 *    Copyright (C) 1989-2001  Cornfed Systems, Inc.
 *
 *  The Roadrunner/pk operating system is free software; you can
 *  redistribute and/or modify it under the terms of the GNU General
 *  Public License, version 2, as published by the Free Software
 *  Foundation.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public
 *  License along with this program; if not, write to the Free
 *  Software Foundation, Inc., 59 Temple Place, Suite 330, Boston,
 *  MA 02111-1307 USA
 *
 *  More information about the Roadrunner/pk operating system of
 *  which this file is a part is available on the World-Wide Web
 *  at: http://www.cornfed.com.
 *
 */

#include <errno.h>
#include <fs/rrfs.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>

int
rrfs_updatedir(file_t file, u_long firstclust)
{
    rrfile_t rrfile = (rrfile_t) file->data;
    buf_t b;
    u_int clust;
    direntry_t de;
    time_t t;
    struct tm tm;
    int off, result;

    /* 
     * Scan directory clusters looking for the one that contains the
     * directory entry we're interested in
     */
    for (clust = rrfile->declust, off = rrfile->deoff;
	 off >= file->bufsize;
	 clust = rrfs_nextclust(file->fs, clust), off -= file->bufsize);

    /* Read the cluster */
    b = bget(file->bufsize);
    blen(b) = file->bufsize;
    if ((result = rrfs_readclust(file, clust, &b)) < 0) {
#if _DEBUG
	kprintf("rrfs_updatedir: read cluster failed (%s)\n",
		strerror(result));
#endif
	brel(b);
	return result;
    }
    de = (direntry_t) (bstart(b) + off);

    /* Update time and date */
    t = time();
    time2tm(t, &tm);
    de->time[0] = (u_char) tm.tm_hour;
    de->time[1] = (u_char) tm.tm_min;
    de->time[2] = (u_char) tm.tm_sec;
    de->date[0] = (u_char) tm.tm_mon;
    de->date[1] = (u_char) tm.tm_mday;
    de->date[2] = (u_char) tm.tm_year;

    /* Update file size and first cluster */
    de->size = (u_long) file->pos;
    de->start = (u_long) firstclust;

    /* Write the updated cluster */
    return rrfs_writeclust(file, clust, &b);
}