BSD 4_3_Net_2 release

[unix-history] / usr / src / sbin / clri / clri.c

/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Rich $alz of BBN Inc.
*
* 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.
*/

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)clri.c      5.3 (Berkeley) 6/29/91";
#endif /* not lint */

/*
* clri(8)
*/

#include <sys/param.h>
#include <ufs/quota.h>
#include <ufs/inode.h>
#include <ufs/fs.h>
#include <unistd.h>
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>

char *fs;

main(argc, argv)
       int argc;
       char **argv;
{
       register struct fs *sbp;
       register struct dinode *ip;
       register int fd;
       struct dinode ibuf[MAXBSIZE / sizeof (struct dinode)];
       long generation, offset, bsize;
       int inonum;
       char sblock[SBSIZE];

       if (argc < 3) {
               (void)fprintf(stderr, "usage: clri filesystem inode ...\n");
               exit(1);
       }

       fs = *++argv;

       /* get the superblock. */
       if ((fd = open(fs, O_RDWR, 0)) < 0)
               error();
       if (lseek(fd, SBLOCK * DEV_BSIZE, SEEK_SET) < 0)
               error();
       if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock)) {
               (void)fprintf(stderr,
                   "clri: %s: can't read the superblock.\n", fs);
               exit(1);
       }

       sbp = (struct fs *)sblock;
       if (sbp->fs_magic != FS_MAGIC) {
               (void)fprintf(stderr,
                   "clri: %s: superblock magic number 0x%x, not 0x%x.\n",
                   fs, sbp->fs_magic, FS_MAGIC);
               exit(1);
       }
       bsize = sbp->fs_bsize;

       /* remaining arguments are inode numbers. */
       while (*++argv) {
               /* get the inode number. */
               if ((inonum = atoi(*argv)) <= 0) {
                       (void)fprintf(stderr,
                           "clri: %s is not a valid inode number.\n", *argv);
                       exit(1);
               }
               (void)printf("clearing %d\n", inonum);

               /* read in the appropriate block. */
               offset = itod(sbp, inonum);     /* inode to fs block */
               offset = fsbtodb(sbp, offset);  /* fs block to disk block */
               offset *= DEV_BSIZE;            /* disk block to disk bytes */

               /* seek and read the block */
               if (lseek(fd, offset, SEEK_SET) < 0)
                       error();
               if (read(fd, (char *)ibuf, bsize) != bsize)
                       error();

               /* get the inode within the block. */
               ip = &ibuf[itoo(sbp, inonum)];

               /* clear the inode, and bump the generation count. */
               generation = ip->di_gen + 1;
               bzero((char *)ip, sizeof *ip);
               ip->di_gen = generation;

               /* backup and write the block */
               if (lseek(fd, -bsize, SEEK_CUR) < 0)
                       error();
               if (write(fd, (char *)ibuf, bsize) != bsize)
                       error();
               (void)fsync(fd);
       }
       (void)close(fd);
       exit(0);
}

error()
{
       (void)fprintf(stderr, "clri: %s: %s\n", fs, strerror(errno));
       exit(1);
}