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