sbin/clri/clri.c

   1 /*
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Rich $alz of BBN Inc.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  *
  36  * @(#) Copyright (c) 1990, 1993 The Regents of the University of California.  All rights reserved.
  37  * @(#)clri.c   8.2 (Berkeley) 9/23/93
  38  * $FreeBSD: src/sbin/clri/clri.c,v 1.4 1999/08/28 00:12:32 peter Exp $
  39  * $DragonFly: src/sbin/clri/clri.c,v 1.8 2006/04/03 01:58:48 dillon Exp $
  40  */
  41
  42 #include <sys/param.h>
  43
  44 #include <vfs/ufs/dinode.h>
  45 #include <vfs/ufs/fs.h>
  46
  47 #include <err.h>
  48 #include <fcntl.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <stdio.h>
  52 #include <unistd.h>
  53
  54 static void
  55 usage(void)
  56 {
  57         fprintf(stderr, "usage: clri filesystem inode ...\n");
  58         exit(1);
  59 }
  60
  61 int
  62 main(int argc, char **argv)
  63 {
  64         struct fs *sbp;
  65         struct ufs1_dinode *ip;
  66         int fd;
  67         struct ufs1_dinode ibuf[MAXBSIZE / sizeof (struct ufs1_dinode)];
  68         long generation, bsize;
  69         off_t offset;
  70         int inonum;
  71         char *fs, sblock[SBSIZE];
  72
  73         if (argc < 3)
  74                 usage();
  75
  76         fs = *++argv;
  77
  78         /* get the superblock. */
  79         if ((fd = open(fs, O_RDWR, 0)) < 0)
  80                 err(1, "%s", fs);
  81         if (lseek(fd, (off_t)SBOFF, SEEK_SET) < 0)
  82                 err(1, "%s", fs);
  83         if (read(fd, sblock, sizeof(sblock)) != sizeof(sblock))
  84                 errx(1, "%s: can't read superblock", fs);
  85
  86         sbp = (struct fs *)sblock;
  87         if (sbp->fs_magic != FS_MAGIC)
  88                 errx(1, "%s: superblock magic number 0x%x, not 0x%x",
  89                     fs, sbp->fs_magic, FS_MAGIC);
  90         bsize = sbp->fs_bsize;
  91
  92         /* remaining arguments are inode numbers. */
  93         while (*++argv) {
  94                 /* get the inode number. */
  95                 if ((inonum = atoi(*argv)) <= 0)
  96                         errx(1, "%s is not a valid inode number", *argv);
  97                 printf("clearing %d\n", inonum);
  98
  99                 /* read in the appropriate block. */
 100                 offset = ino_to_fsba(sbp, inonum);      /* inode to fs blk */
 101                 offset = fsbtodb(sbp, offset);          /* fs blk disk blk */
 102                 offset *= DEV_BSIZE;                    /* disk blk to bytes */
 103
 104                 /* seek and read the block */
 105                 if (lseek(fd, offset, SEEK_SET) < 0)
 106                         err(1, "%s", fs);
 107                 if (read(fd, ibuf, bsize) != bsize)
 108                         err(1, "%s", fs);
 109
 110                 /* get the inode within the block. */
 111                 ip = &ibuf[ino_to_fsbo(sbp, inonum)];
 112
 113                 /* clear the inode, and bump the generation count. */
 114                 generation = ip->di_gen + 1;
 115                 memset(ip, 0, sizeof(*ip));
 116                 ip->di_gen = generation;
 117
 118                 /* backup and write the block */
 119                 if (lseek(fd, (off_t)-bsize, SEEK_CUR) < 0)
 120                         err(1, "%s", fs);
 121                 if (write(fd, ibuf, bsize) != bsize)
 122                         err(1, "%s", fs);
 123                 fsync(fd);
 124         }
 125         close(fd);
 126         exit(0);
 127 }